steel crane industry internationalization primary task is to explore the international market, to achieve localization and supporting sustainable development. The enterprises should strengthen overseas distribution system, improve the localization of spare parts supply and after-sales service, quality products and good faith foothold. The whole industry in the overseas strengthen cooperation and achieve resource sharing; strengthen self-discipline, reducing unhealthy competition, not on price; attaches great importance to intellectual property rights, innovation in product development to invest more effort and resources; ensure the health of the industry in overseas markets and sustainable development.
Single girder
bridge gantry crane gear defects are: meshing gears wear, broken teeth, hub bore and keyway wear, ring and spoke to crack, cracks, etc. reducer body. The most dangerous flaw is lifting mechanism and luffing mechanism pinion wear.
Single girder
overhead gantry crane gear tooth wear can be regulated testing. Tooth wear does not exceed the specified limit, can be repaired using. Hoisting mechanism and luffing gear wear than the limits shown in Table 17-5-4, it must be replaced.
Carts running mechanism and slewing gear wear, allows repair welding method. However, the modulus of the gear 10 or less, the relative amount of not more than 25% of wear; modulus than the gear 10, the relative wear amount not exceeding 30%. For welding mechanical properties of metallic materials and repair pieces of material must adapt. Should elapse after the repair welding annealing and normalizing.
Hoisting and luffing mechanism broken teeth, rims are not allowed to pass welding defects such as cleft repair. Walking and slewing mechanism hub bore and keyway defect allows the first method of processing after welding repair.
2013年7月31日星期三
Maintenance crane brakes, what aspects should be considered?
Electric
hoist gantry crane brake common defects are: brake wheel wear, brake band or brake pad wear, hinge lever system pin point hole to expand, pin wear, deformation and force transmission lever fastener wear.
Brake band wear 超过 2 ~ 3mm, should be replaced. Electric hoist overhead gantry crane wear is not excessive, should focus on checking the brake with the brake pads fixed on the case. If found exposed rivets should be buried it. Brake band brake shoe must fit closely, not a partial disability.
Brake wheel brake arm overhaul points are: the elimination of the hinge point hole clearance, replace worn pins, repair lever system must ensure that the fit tolerance requirements.
Use reamer reamer, you must ensure that the new bore hole diameter 15% larger than the original. Meanwhile, with the pin reamer should be replaced accordingly. If the hinge point bore wear too large, can be affixed to weld reinforcement plate after processing. Pin worn more than 5% of the original diameter and must be replaced.
bridge gantry crane On the brake lever and pull the lever deflection plates and other parts, it is necessary to use after straightening. Generally small fasteners should all be replaced. Do not use non-conforming size washer. Not prohibited in the case of gasket used alone cotter pin.
Assembled brake repair and must ensure that: each rod lever system can be relatively free movement, balanced smooth, no obstruction; brake band and brake shoe snug fit sizes to meet the requirements; brake is released, the brake wheel and the gap between the brake band not less than 0.25mm. For the 100-200mm brake wheel, the standard gap of 0.5mm: 200-400mm for Rural brake wheel, the standard clearance of 1.0mm. The gap is too large, the braking torque is difficult to guarantee; gap is too small, it will cause the brake shoe bite plug.
Hoisting mechanism and luffing mechanism braking torque should be able to reach 1.85-2 times the rated braking torque. Adjust brake requirements are: brake shoe hold, the solenoid still not less than 15% of the total stroke travel back to accommodate the need for using the adjustment process. After adjusting the brake overhaul, after passing the test stand can be delivered.
Brake band wear 超过 2 ~ 3mm, should be replaced. Electric hoist overhead gantry crane wear is not excessive, should focus on checking the brake with the brake pads fixed on the case. If found exposed rivets should be buried it. Brake band brake shoe must fit closely, not a partial disability.
Brake wheel brake arm overhaul points are: the elimination of the hinge point hole clearance, replace worn pins, repair lever system must ensure that the fit tolerance requirements.
Use reamer reamer, you must ensure that the new bore hole diameter 15% larger than the original. Meanwhile, with the pin reamer should be replaced accordingly. If the hinge point bore wear too large, can be affixed to weld reinforcement plate after processing. Pin worn more than 5% of the original diameter and must be replaced.
bridge gantry crane On the brake lever and pull the lever deflection plates and other parts, it is necessary to use after straightening. Generally small fasteners should all be replaced. Do not use non-conforming size washer. Not prohibited in the case of gasket used alone cotter pin.
Assembled brake repair and must ensure that: each rod lever system can be relatively free movement, balanced smooth, no obstruction; brake band and brake shoe snug fit sizes to meet the requirements; brake is released, the brake wheel and the gap between the brake band not less than 0.25mm. For the 100-200mm brake wheel, the standard gap of 0.5mm: 200-400mm for Rural brake wheel, the standard clearance of 1.0mm. The gap is too large, the braking torque is difficult to guarantee; gap is too small, it will cause the brake shoe bite plug.
Hoisting mechanism and luffing mechanism braking torque should be able to reach 1.85-2 times the rated braking torque. Adjust brake requirements are: brake shoe hold, the solenoid still not less than 15% of the total stroke travel back to accommodate the need for using the adjustment process. After adjusting the brake overhaul, after passing the test stand can be delivered.
You are single girder gantry crane to understand how much?
After several years of learning and innovation, China's enterprises are gradually rewriting
steel crane foreign clients on China Construction Machinery understanding. But it is undeniable that, in the technical research, product development, innovation, reliability research, manufacturing processes, business management and other aspects of well-known international company still lags behind. This leads to our crane industry big but not strong, low profits. And in the international high-end market, especially in the large tonnage of products, the competitiveness of a serious shortage of cranes.
Single girder overhead gantry crane , trolley runs on a single main beam, through horizontal or vertical anti-wheel anti-hook security to ensure the safety and reliability of its operation, the length of the crane lifting material particularly suitable for turning operations, major used in machinery manufacturing plant, warehouse, yard, station maintenance, assembly and other places.
Single girder gantry crane cab has two forms of manipulation and ground handling.
Single girder bridge gantry crane features:
1, single girder gantry crane 5 tons, 10 tons, 16/3.2 tons, 20/5 t and 32/5 t 5 kinds of standards from the weight; 18 m, 22 m, 26 m, 30 m and 35 m 5 kinds of standard span.
2, this series has slip line crane cable power supply and power supply are two basic ways.
3, from the weight of 32/5 t when using trolley carts run structure (a total of eight big wheels)
4, single girder gantry crane weight less than or equal to 20/5 tons, the car take the form of a vertical counter-rollers; starting weight of 32/5 t, the level of anti-wheel trolley taken;
5, from the weight of 32/5 t, the electronic control device installed in an electrical room focused. Electrical room in the center with the leg opposite the cab.
6, single girder hoist gantry crane rail crane lifting height is divided into two parts, both above and below the surface, the user must be careful.
Single girder overhead gantry crane , trolley runs on a single main beam, through horizontal or vertical anti-wheel anti-hook security to ensure the safety and reliability of its operation, the length of the crane lifting material particularly suitable for turning operations, major used in machinery manufacturing plant, warehouse, yard, station maintenance, assembly and other places.
Single girder gantry crane cab has two forms of manipulation and ground handling.
Single girder bridge gantry crane features:
1, single girder gantry crane 5 tons, 10 tons, 16/3.2 tons, 20/5 t and 32/5 t 5 kinds of standards from the weight; 18 m, 22 m, 26 m, 30 m and 35 m 5 kinds of standard span.
2, this series has slip line crane cable power supply and power supply are two basic ways.
3, from the weight of 32/5 t when using trolley carts run structure (a total of eight big wheels)
4, single girder gantry crane weight less than or equal to 20/5 tons, the car take the form of a vertical counter-rollers; starting weight of 32/5 t, the level of anti-wheel trolley taken;
5, from the weight of 32/5 t, the electronic control device installed in an electrical room focused. Electrical room in the center with the leg opposite the cab.
6, single girder hoist gantry crane rail crane lifting height is divided into two parts, both above and below the surface, the user must be careful.
Electric hoist gantry crane rotary mechanism failure analysis and solutions
Other than gantry crane and overhead gantry crane have in common, there are many differences, such as the rotating mechanism, luffing mechanism, etc., in the metal structure also has its own unique, so there are special fault conditions place, the following is an electric hoist gantry crane rotating mechanism fault phenomena, cause analysis and troubleshooting methods.
An electric hoist gantry crane pulled the master controller handle rotation mechanism, institutions no action
(1) Analysis:
a zero contacts being exposed or damaged.
b voltage relay coil circuit or wire disconnected.
c overcurrent relay normally closed contact is closed.
d bolts loose wiring, poor contact, tighten the bolts.
(2) Remedy: Repair or replace the electric hoist gantry crane all related components.
2, the electric hoist bridge gantry crane rotation speed is slow, less than the rated speed
(1) Analysis: a control panel in an accelerating contactor pull well, it will lead to the next level and beyond contactor can not pull, so the motor rotor resistance can not be connected to the appropriate people removed, the motor of less than the rated speed.
(2) Remedy: Check the step by step each electric hoist gantry crane acceleration respective contacts normally open contact, making good contact at work, at all levels of circuit flow.
Electric hoist gantry crane slip slope Cause Analysis and Troubleshooting Introduction
Our country is at an unprecedented rate into globalized international competitive market, China's crane manufacturing industry is facing both opportunities and challenges to the new situation. Therefore, electric hoist
overhead gantry crane of continuous development and innovation is the key.
Jacketed rotary scroll wheel support means horizontal deformation of the annular lower raceway raceway operation resulting in the rotating parts are climbing, slip slope phenomenon, and the track surface in the circumferential direction of the many small cracks appear and female erosion.
Electric hoist gantry crane slip slope Analysis: Walking track foundation is not strong and low-lying, laying adjusted properly, so that two rail same section height difference in the long run have a serious ultra-poor and severely distorted single track. The steel crane as a whole is tilted, indirectly reflected in the circular orbit, causes the roller contact points in the track a small area of stress concentration formed. Track at the wheel rolling repeatedly under high load hardened layer peeled off easily separated with the body, forming local fatigue damage to the track surface.
(2) Remedy:
A commonly used repair methods: electric hoist gantry crane rotating parts removed, send factories with a large machining repairs.
(2) temporary repair method: After rotating parts to stop fixed on the benefits, there will be cracks cracks and peeling at the shovel from the skin to go with the surfacing weld, polished smooth with the wheel, and then throw smooth.
3 Break Repair method: stop fixed on the rotating part of the original rail finish benefits, removal impede repair wheel, the need to replace the electric hoist gantry crane rail removed (this circular orbit is generally divided into 4-5 segments splicing Cheng, a new track will be processed re-welded to the original site, complete the segment between the butt smooth grinding wheel wells.
Jacketed rotary scroll wheel support means horizontal deformation of the annular lower raceway raceway operation resulting in the rotating parts are climbing, slip slope phenomenon, and the track surface in the circumferential direction of the many small cracks appear and female erosion.
Electric hoist gantry crane slip slope Analysis: Walking track foundation is not strong and low-lying, laying adjusted properly, so that two rail same section height difference in the long run have a serious ultra-poor and severely distorted single track. The steel crane as a whole is tilted, indirectly reflected in the circular orbit, causes the roller contact points in the track a small area of stress concentration formed. Track at the wheel rolling repeatedly under high load hardened layer peeled off easily separated with the body, forming local fatigue damage to the track surface.
(2) Remedy:
A commonly used repair methods: electric hoist gantry crane rotating parts removed, send factories with a large machining repairs.
(2) temporary repair method: After rotating parts to stop fixed on the benefits, there will be cracks cracks and peeling at the shovel from the skin to go with the surfacing weld, polished smooth with the wheel, and then throw smooth.
3 Break Repair method: stop fixed on the rotating part of the original rail finish benefits, removal impede repair wheel, the need to replace the electric hoist gantry crane rail removed (this circular orbit is generally divided into 4-5 segments splicing Cheng, a new track will be processed re-welded to the original site, complete the segment between the butt smooth grinding wheel wells.
Market-driven expansion of the crane industry enterprises thrive gantry crane
With the Chinese economy and the rapid development of infrastructure, led the Chinese crane market's rapid development, China has become an important global crane market. Crane's rapid development is stimulated by single girder overhead gantry crane equipment market boom, to single girder gantry crane equipment development brings more power source.
According to the analysis, in recent years, especially in areas of the energy industry to develop, led the Chinese crane industry's continued healthy development, it is driven by a large number of extremely powerful lifting equipment construction enterprises. China gantry crane industry has emerged a group with considerable scale and strong competitive large lifting equipment companies; these lifting equipment manufacturing enterprises, but also with Chinese crane market, overseas expansion into foreign markets is also positive.
Single girder bridge gantry crane equipment industry and the crane industry can be said that mutual promotion and mutual development. China gantry crane equipment in the field of rapid development, but also for the Chinese crane industry has supported the development. At present the domestic crane market, brings together almost all of the world-renowned manufacturers. Many foreign brands have a large crane assembly manufacturing base in the country to build, it can be said is also very optimistic about the strength of domestic enterprises lifting equipment.
Large foreign lifting equipment to seize the Chinese market, coupled with the escalating demand for Chinese users, for the local lifting machinery enterprises, it is an opportunity and a challenge. There is competition, will progress. Local enterprises in response to the lifting equipment and lifting equipment market changes in the products and technologies are also constantly innovate. Some local businesses have launched their own intellectual property, high value-added, high-tech large-tonnage mobile steel crane products. It can be said that China to fill the gaps in this field of technology, for the lifting machinery industry is a big step forward. Also the domestic industry to the gantry crane equipment lifting equipment industry throughout the world the opportunity to showcase their strength!
2013年7月29日星期一
Gantry crane rail clamp configuration and design features
Electric hoist gantry crane rail clamp and the locomotive is a hole through the rear axle clamp connection, locomotives when walking, dragging (push) synchronous dynamic rail clamp is moved, the guide rail clamp wheel in under the pressure of the weight along the Snake rail rolling, and by guiding wheel bracket, drive shaft guide rail clamp pliers whole surface of the fixed shaft floating along the track, so the rail clamp pliers with the centerline of the track rail clamp pliers and the lowest point of the height of the track surface is always controlled at design value, the walking track rail clamp will not produce grazing clamp, clamp the mouth so that the two are consistent clamping force.
The device is in its lower jaw iron designed a hook, this hook rail clamp clamp tight in the rail after rail can be fastened to prevent electric hoist overhead gantry crane rail clamp pliers slide along its own accident while on the move The clamping force is released.
(A) technical parameters for each sub-clamp clamping force 20t; jaw opening 20 °; open clamp time 7s; clamp time 10s; open caliper clamp rail surface distance from the lowest point of 30mm; windproof level 12.
(2) electric hoist gantry crane rail clamp design features:
① electric hoist bridge gantry crane rail clamp locking clamping mechanism is designed after clamping point C below the AB connection, so that the clamping force from other factors, to keep within the design value; ② compressible reservoir can be set within the accumulator spring rod, connecting rod can be shortened with the compression of the spring, to meet the dead point over the technical conditions required for the design, but also has a compensation function; ③ installed on a four door rail clamp, total clamping force up to 80t, can withstand 12 gale; simultaneously clamp hook head design, can prevent vehicle rollover; ④ rail clamp rises up after opening pliers 100mm, making it the lowest point to keep away from the rail surface distance 30mm, locomotives and rail clamps when walking interference will not occur; ⑤ guide rail clamp wheel overcome flatness and straightness of rail defects, rail clamp so that the center line of the center line of the track surface and the height of the jaw and the rail maintained within the design value.
May gantry crane maintenance content
1 orbit
(A) single girder hoist gantry crane operation within the operating range obstructions within buildings and other equipment with a minimum spacing should be not less than 100mm
(2) the end of the stopper rail and connecting bolts or welds. Rail end stop not allowed to have deformation, damage and other defects, which can not be loosened bolts. Seam welded connections shall not have cracks.
(3) fixed rail connecting bolts, bolt without loosening.
2 button device
(A) single girder bridge gantry crane button appearance and insulation may not have damage.
(2) Cable upper and lower ends fixed to be solid and reliable not damaged, broken or defective, shall ensure that insulation.
3 hook device
(1) Visually single girder hook gantry crane hook must not have cracks, abnormal wear and hook mouth abnormal deformation.
(2) Bearing rotation should be flexible and smooth.
(3) hook nut locking device may not be loosened.
(4) Pulley grooves must abnormal wear, rim complete and no damage.
4, the appearance of the pulley housing shall wear, gear shaft panels, stalls circle and off without loosening the hook mouth locking device should be normal.
5. Rope
(A) each rope end is fixed to the end of a fixed rope status should be solid and reliable, without exception.
(2) single girder overhead gantry crane may not have the appearance of kinks, burns and obvious loose, corrosion and other defects, ropes proper grease.
Crane agency inspection items and criteria
1 electric
hoist gantry crane brake check oil is suitable for leaks; rack for cracks and cracks; pawl and ratchet engagement state whether there is abnormal, damaged, worn; gear for damage, cracks and wear; Machine Rack mounting is loose or fall off; fluid is clean; fuel fit, do not leak; no cracks and cracking; declines reliable engagement, no cracks, damage and significant wear; gear five wear; gear no wear, meshing normal; rack without loosening, shedding; no significant oil pollution
2 reel assembly
(1) Roll electric hoist overhead gantry crane inspection for cracks, deformation and wear; rope fixed part without exception; rope off the groove traces reel mounting connections are tight. No cracks, no significant deformation and wear; normal; no traces off slot. No loose.
(2) electric hoist bridge gantry crane shaft and bearing inspection for cracks, deformation, wear and tear; Shaft baffle without deformation and loose. Rotating drum, and check the bearing without abnormal noise, heat and vibration; no cracks, significant deformation and wear; no distortion loose, no abnormal vibration, sound, heat; oiled.
3 pulley
(A) inspect the pulley for cracks, defects, wear and tear; groove rope without exception; whether the rope off the groove marks; plate and the positioning pin is loose; no cracks, significant deformation and wear; no abnormal wear and tear; without shedding traces ; no loose.
(2) gear shaft and the bearing rope, balancing pulleys, etc. Check cracks and wear; lubrication; rotating pulley, with or without sound and rotary eccentric mass. Check off the tank, off, deformation, cracks. No cracks, significant wear; no abnormal sound and quality without shedding eccentric, off tank, deformation, cracks
4 wire
(1) Check the wire rope structure structure diameter as designed; spreader lower limit position, check the safety of the reel turns.
(2) whether the rope status check broken wire rope, broken stocks, exposed core, kinks, corrosion, Bay fold, loose, worn; temperature environment should be checked using the rope structure is correct; end processing and fixed correctly; whether to quit phenomenon; without adhering dust, sand, impurities, moisture; a twisting pitch may not have more than 10% of the broken wire, rope diameter shall not be less than the nominal size of 93%. Not to be defective, and stable fixation; no quit; sticky sand, dust and impurities, moisture.
(3) electric hoist gantry crane wire rope installation checks whether the structure of grazing; and poor condition of each pulley by not grazing; may not have significant wear, partial pressure, loose.
2 reel assembly
(1) Roll electric hoist overhead gantry crane inspection for cracks, deformation and wear; rope fixed part without exception; rope off the groove traces reel mounting connections are tight. No cracks, no significant deformation and wear; normal; no traces off slot. No loose.
(2) electric hoist bridge gantry crane shaft and bearing inspection for cracks, deformation, wear and tear; Shaft baffle without deformation and loose. Rotating drum, and check the bearing without abnormal noise, heat and vibration; no cracks, significant deformation and wear; no distortion loose, no abnormal vibration, sound, heat; oiled.
3 pulley
(A) inspect the pulley for cracks, defects, wear and tear; groove rope without exception; whether the rope off the groove marks; plate and the positioning pin is loose; no cracks, significant deformation and wear; no abnormal wear and tear; without shedding traces ; no loose.
(2) gear shaft and the bearing rope, balancing pulleys, etc. Check cracks and wear; lubrication; rotating pulley, with or without sound and rotary eccentric mass. Check off the tank, off, deformation, cracks. No cracks, significant wear; no abnormal sound and quality without shedding eccentric, off tank, deformation, cracks
4 wire
(1) Check the wire rope structure structure diameter as designed; spreader lower limit position, check the safety of the reel turns.
(2) whether the rope status check broken wire rope, broken stocks, exposed core, kinks, corrosion, Bay fold, loose, worn; temperature environment should be checked using the rope structure is correct; end processing and fixed correctly; whether to quit phenomenon; without adhering dust, sand, impurities, moisture; a twisting pitch may not have more than 10% of the broken wire, rope diameter shall not be less than the nominal size of 93%. Not to be defective, and stable fixation; no quit; sticky sand, dust and impurities, moisture.
(3) electric hoist gantry crane wire rope installation checks whether the structure of grazing; and poor condition of each pulley by not grazing; may not have significant wear, partial pressure, loose.
Gantry crane bridge structure design description
With the development of modern industry, cranes in metallurgy, machinery, transportation, electricity, construction, mining, chemicals, shipbuilding, ports and defense industrial sectors more widely. It is for the development of national economy and improving people's things, cultural life plays an important role. With the rapid development of economic construction, mechanization, the degree of their own initiative are constantly improving, and this is also the skills to adapt to the rapid development of the crane, a steady increase in the product category, electric hoist overhead gantry crane scale used more widely.
Some companies because there is no lifting, working not only inefficient, labor-intensive, and even harder work. High-rise building construction, on or tens of tons tons of large-scale boat building, rocket and missile launch, construction and installation of large power stations, large loading and unloading and transport of heavy pieces, etc., are inseparable from the crane operation . Electric hoist gantry crane in the production process not only play a supporting role, but the mass production and assembly line has become an indispensable part of it is the mechanization and automation, improve labor productivity, reduce manual an important tool.
Electric hoist gantry crane bridge is formed by a steel structure, the structure in the form of truss constructions. To do the main beam I-beam, main beam welded at both ends of the side beams constituting channel; in the main beam is placed on one side of the horizontal angle constituted and vertical truss truss, used to install the drive mechanism and enhanced bridge carts horizontal stiffness. When the span of ≥ 9.5 meters, at the top of the main beam welded channel on the composition of the cantilever, in order to ensure the strength and stiffness of the bridge, as well as reduce the structural weight.
Electric hoist bridge gantry crane traveling mechanism is divided into two kinds of centralized transmission and separately driven, the main driven wheel angular bearing housing is bolted to the end beam ends. Motor, reducer and brake are centrally installed in the walk on stage. The coupling wheel by the brake motor and reducer input shaft coupling, during a solenoid brake reducer output shaft via a gear coupling, shaft, bearing frame is connected with the driving wheel, when the motor starts, both drive Active Wheel running.
Steel crane girder installation process description
Single girder gantry crane crane beam preparation before installation: complete lifting steel columns, fixed on the basis of the corrected and go through preflight procedures. In the steel columns and column bracket on the side playing good crane beams, trusses central axis brake installed bit Ge lines and elevation lines; steel truss crane girder ends and the brake bomb good central axis.
steel crane girder installation process:
(A) single girder gantry crane steel crane girder installation, will be installed at both ends of the steel plate on the steel columns corbels, and mark the center of the crane girder installation bit Ge.
(2) steel crane beam lashing generally use two symmetrical banding, at each end of the rope tied to a slip in traction when lifting and preventing collisions on steel columns.
(3) steel crane girder lift, rotate single girder overhead gantry crane jib crane beam centerline rod so that the positioning of the axis aligned with corbels and pillars connected with flush bolts only after the release hooks .
(4) steel crane beam correction, according to the plant expansion joints partition segmentation correction, or all of a crane girder is installed backward population correction.
(5) Correction include: elevation, vertical, planar bit Ge (central axis) and span. In addition to the general elevation, shall be corrected in the steel columns and roof lifting completed and fixed after calibration, in order to avoid correction caused by lifting roof trusses span between steel column shift.
Single girder hoist gantry crane quality control and inspection standards: Quality control of the master project and general project, master project refers to materials, components, fittings, equipment or construction projects play a decisive role construction quality inspection items, general project refers to the quality of construction will not achieve a decisive role in the test project.
(A) single girder gantry crane steel crane girder installation, will be installed at both ends of the steel plate on the steel columns corbels, and mark the center of the crane girder installation bit Ge.
(2) steel crane beam lashing generally use two symmetrical banding, at each end of the rope tied to a slip in traction when lifting and preventing collisions on steel columns.
(3) steel crane girder lift, rotate single girder overhead gantry crane jib crane beam centerline rod so that the positioning of the axis aligned with corbels and pillars connected with flush bolts only after the release hooks .
(4) steel crane beam correction, according to the plant expansion joints partition segmentation correction, or all of a crane girder is installed backward population correction.
(5) Correction include: elevation, vertical, planar bit Ge (central axis) and span. In addition to the general elevation, shall be corrected in the steel columns and roof lifting completed and fixed after calibration, in order to avoid correction caused by lifting roof trusses span between steel column shift.
Single girder hoist gantry crane quality control and inspection standards: Quality control of the master project and general project, master project refers to materials, components, fittings, equipment or construction projects play a decisive role construction quality inspection items, general project refers to the quality of construction will not achieve a decisive role in the test project.
Gantry crane parts reducer overhaul disassembly
Single girder bridge gantry crane parts reducer demolition if the whole same model, with the transmission ratio gearbox spare parts, we have corrupted the entire gearbox can be replaced. Remove the speed reducer shaft, respectively, the driven shaft connecting bolts, making reducer and transmission disengaged, remove the bolt, the entire gearbox can be removed.
1, single girder overhead gantry crane demolished parts reducer
① the high-speed shaft and the driven shaft of the joint shaft coupling bolts remove, disengage the gearbox transmission.
② Remove the reducer connection between the cover and the base bolts and tighten mortgage cover screws reducer lid opened, the combination of surface voids split gearbox, easy prying off reducer cover.
③ the gearbox drive shaft assembly and the driven shaft assembly were removed from the base of the gear unit.
2, single girder hoist gantry crane reducer overhaul
Joints gearcase overhaul: reducer after some time after the operation, the box sometimes deformed. Deformation at the box not only affects the joints gear transmission accuracy, but there will be leakage. Therefore, it must be repaired.
① cleaning tank with kerosene, cleaning joints on the dirt, sludge, etc., painted with red lead oil to make two joints running, scrape every individual grinding time highs and glitches, after several grinding, you can achieve the required accuracy.
② After grinding, the available test joints feeler gap, and its value should not exceed 0.03mm, single girder gantry crane underside of the joint surface parallelism error of 1m length should not exceed 0.5mm.
Several crane lifting mechanism protection device
One, zero and voltage protection circuit:
Electric hoist gantry crane upgrade, Zhang closing cam controller zero contact with the four motor overcurrent relays normally closed contacts in series with the relay coil loop at zero pressure, only in upgrading, Zhang closed master controller handles are at zero, the zero pressure to energize the relay coil and through one pair of normally open contacts remain self-locking.
2, to enhance, Zhang closed loop interlocking protection:
In upgrading and Zhang closing contactor coil circuit, each string and then in the opposite direction contactor normally closed contact, which decreased lift circuit in series with the contactor normally closed contact, a decrease in series with the contactor coil circuit increased contacts normally closed contact, the same, electric hoist gantry crane Zhang bucket bucket and closed contactor coil circuit also string then the other normally closed contact. This prevents misuse under fault conditions or when there is a power short circuit may.
3, enhance, Zhang closed loop limit, overweight protection:
Electric hoist overhead gantry crane rise and fight off the contactor coil circuit, the common string into the upgrade limit, fighting off limit and load cell normally closed contact. When grab upgrade to a predetermined position, the limit switch is open, cut off the power grab lift circuit, protective equipment safety; grab grab when the material exceeds the limits of the bridge gantry crane overweight sensor sends an alarm and cut grab promotion loop power supply in order to prevent accidents.
4, enhance, Zhang closed brake circuit:
Electric hoist gantry crane upgrade, Zhang closed brake (hydraulic pusher) There are four, respectively, by two contactor control. When upgrading, Zhang closed contactor is switched on, which they followed a pair of normally open contacts close and turn the corresponding brake contactor coil circuit, the power brake motor running, brake open, improve Zhang progressively closed motor revving.
Electric hoist gantry crane upgrade, Zhang closing cam controller zero contact with the four motor overcurrent relays normally closed contacts in series with the relay coil loop at zero pressure, only in upgrading, Zhang closed master controller handles are at zero, the zero pressure to energize the relay coil and through one pair of normally open contacts remain self-locking.
2, to enhance, Zhang closed loop interlocking protection:
In upgrading and Zhang closing contactor coil circuit, each string and then in the opposite direction contactor normally closed contact, which decreased lift circuit in series with the contactor normally closed contact, a decrease in series with the contactor coil circuit increased contacts normally closed contact, the same, electric hoist gantry crane Zhang bucket bucket and closed contactor coil circuit also string then the other normally closed contact. This prevents misuse under fault conditions or when there is a power short circuit may.
3, enhance, Zhang closed loop limit, overweight protection:
Electric hoist overhead gantry crane rise and fight off the contactor coil circuit, the common string into the upgrade limit, fighting off limit and load cell normally closed contact. When grab upgrade to a predetermined position, the limit switch is open, cut off the power grab lift circuit, protective equipment safety; grab grab when the material exceeds the limits of the bridge gantry crane overweight sensor sends an alarm and cut grab promotion loop power supply in order to prevent accidents.
4, enhance, Zhang closed brake circuit:
Electric hoist gantry crane upgrade, Zhang closed brake (hydraulic pusher) There are four, respectively, by two contactor control. When upgrading, Zhang closed contactor is switched on, which they followed a pair of normally open contacts close and turn the corresponding brake contactor coil circuit, the power brake motor running, brake open, improve Zhang progressively closed motor revving.
2013年7月28日星期日
Enhanced ability to resist market risk lifting machinery
As the state of infrastructure investment in the policy and funding support, such as our common crane
overhead gantry crane industry suffered fluctuations, led to the development of SMEs enthusiasm. But from the second half of 2012 statistics, the first half of the scale of growth is explosive market expansion, most of the SMEs are in the benefit increase, which led to 2012 the cumulative decline qoq too large, growth structure is not reasonable.
And as the market gradually decline, the market's weakness was reflected in the state. We see that in addition to large-scale, high-end professional crane manufacturing enterprise, the common hoist gantry crane industry status quo is not ideal, vicious competition on the market and low-end small profit margins of the phenomenon still exists, therefore, the situation facing the industry is still uncertain.
Therefore, we should focus more on promoting smart growth industry, in the case of market segments, out of a development road of independent innovation. First, enterprises should speed up scientific and technological achievements of the output efficiency, stable, mature technology, configuration standardization, based on the core areas and to increase the development and application of technology, optimize product structure, nurturing brand of independent value; Secondly, the industry should strengthen cooperation and exchanges in the platform technology, security technology, environmental technology, energy technology and other fields to establish a common platform for the industry will be in the market for high-end products as our subject; Again, universal gantry crane companies to compete in the market continue to explore development mechanism constantly adjust itself incompatible with the development requirements of local, enhanced marketing services. Finally, companies should strengthen the capacity to respond to market, optimize the market allocation of resources, to avoid price competition to reproduce the cycle.
Universal bridge gantry crane industry demands the development needs of a wide range of cooperation, we need the cooperation in various fields. The more expansive growth, the more we need to have a scientific market forecasts and judgments, and enhance the ability to withstand market risks, to deepen understanding of the market. While continuing to implement the strategic development of the industry will be required to fill the meantime rational development, adhere to the development.
And as the market gradually decline, the market's weakness was reflected in the state. We see that in addition to large-scale, high-end professional crane manufacturing enterprise, the common hoist gantry crane industry status quo is not ideal, vicious competition on the market and low-end small profit margins of the phenomenon still exists, therefore, the situation facing the industry is still uncertain.
Therefore, we should focus more on promoting smart growth industry, in the case of market segments, out of a development road of independent innovation. First, enterprises should speed up scientific and technological achievements of the output efficiency, stable, mature technology, configuration standardization, based on the core areas and to increase the development and application of technology, optimize product structure, nurturing brand of independent value; Secondly, the industry should strengthen cooperation and exchanges in the platform technology, security technology, environmental technology, energy technology and other fields to establish a common platform for the industry will be in the market for high-end products as our subject; Again, universal gantry crane companies to compete in the market continue to explore development mechanism constantly adjust itself incompatible with the development requirements of local, enhanced marketing services. Finally, companies should strengthen the capacity to respond to market, optimize the market allocation of resources, to avoid price competition to reproduce the cycle.
Universal bridge gantry crane industry demands the development needs of a wide range of cooperation, we need the cooperation in various fields. The more expansive growth, the more we need to have a scientific market forecasts and judgments, and enhance the ability to withstand market risks, to deepen understanding of the market. While continuing to implement the strategic development of the industry will be required to fill the meantime rational development, adhere to the development.
Crane industry presents new features
In the economic context of sustainable development, China's overhead gantry crane crane industry in order to benefit the tension and endogenous forces to highlight the growth achieved by the start of the two strategic phase. As the consumer market by a single conventional demand to the large, specialized transition, China's large crane industry, specialization tends to gradually revealed, technology upgrades and structured as a precondition towards maturity kicked off this.
Industrialization and urbanization, the construction of the achievements of the continued evolution of the national economy continued to be active in the growing domestic crane industry. In the economic context of sustainable development, China's bridge gantry crane crane industry in order to benefit the tension and endogenous forces to highlight the growth achieved by the start of the two strategic phase. As the consumer market by a single conventional demand to the large, specialized transition, China's large crane industry, specialization tends to gradually revealed.
The growing economic specialization in close association for our gantry cranes crane industry development has brought new opportunities to meet the needs of different areas of product development for the purpose of cranes, but also so that our crane industry has shown new features.
hoist gantry crane crane industry in the "new features" in-depth development of the next to nuclear power, paper, waste disposal and other single area at the core of the development and promotion of special cranes crane industry to expand the market for our country to achieve diversification provided important support, to meet the anti-corrosion, explosion-proof, insulation and other "harsh" requirement cranes with special properties are also favored by the market.
Crane track laying technical processes
Crane track laying technical processes
With the construction crane machine and parts promulgation and implementation of the new standard, universal overhead gantry crane for construction safety, environmental protection and energy reliability have become increasingly demanding, will bring the whole industry change the profit model, and continuously improve the core competitiveness and brand value.
Universal hoist gantry crane
at what needs to be done before laying prepare it
1, before laying rail rail end response, straightness and twist checks after passing laying.
2, lifting the track rail mounting should be determined before baseline, the baseline should rail mounting location for the crane beam axis.
3, the actual track centerline on the centerline of the actual crane beam position deviation not greater than 10mm, and not greater than half the thickness of the cable car.
4, the track center line of the installation of the actual level of the baseline position deviation, for general o overhead bridge crane , gantry cranes and handling general should not exceed 5mm for bridge girder suspension cranes should not exceed 3mm.
5, Universal gantry crane rail span tolerances shall comply with the following requirements.
Lifting install what significance it
Lifting install what significance it
1, gantry cranes are often massive structure, institutional complex mechanical equipment, rarely fully assembled from the factory shipped to the user, usually must be used in most of the scene to disperse several assembled into a complete whole. Therefore, it is necessary to reflect the correct installation crane overall eligibility to test the integrity of the whole crane and integrity.
2, the hoist gantry crane is in the consumer's premises or building orbit, even in the wall of the building overhead track or a designated track or set installed on the ground, so for its orbit or mounting base, and the crane itself, is able to complement each other well, and the ability to run whether they can adapt to meet strict requirements, must go through the proper installation and post-installation commissioning and testing conclusions.
3, overhead gantry crane is a kind of security work demanding a certain danger of special mechanical equipment. All safety devices and safety measures, and only after the installation of the crane to enter the normal operating position and working condition. To test these safety devices and safety equipment is reliable, flexible, accurate, and also must pass the crane installation and post-installation test to test.
4, the crane is a special job bear lifting machinery, in order to make the gantry crane into use rights can meet various load operational requirements, it must be no load on the crane, load, overload static and dynamic load tests. These tests must be the operating state of the lifting mechanism or specific location of a stationary state and the conducted. It also requires to be carried out after installation of the crane load test only after the transfer of use.
5, bridge gantry crane wire rope and other linear parts and many other parts will occur in some of the initial elongation under load, deformation, loose and so on. These must require the crane installation, commissioning loaded after correction for repair, adjustment, handling and reliable fastening, it must also be possible in the future safe and normal use of the crane.
1, gantry cranes are often massive structure, institutional complex mechanical equipment, rarely fully assembled from the factory shipped to the user, usually must be used in most of the scene to disperse several assembled into a complete whole. Therefore, it is necessary to reflect the correct installation crane overall eligibility to test the integrity of the whole crane and integrity.
2, the hoist gantry crane is in the consumer's premises or building orbit, even in the wall of the building overhead track or a designated track or set installed on the ground, so for its orbit or mounting base, and the crane itself, is able to complement each other well, and the ability to run whether they can adapt to meet strict requirements, must go through the proper installation and post-installation commissioning and testing conclusions.
3, overhead gantry crane is a kind of security work demanding a certain danger of special mechanical equipment. All safety devices and safety measures, and only after the installation of the crane to enter the normal operating position and working condition. To test these safety devices and safety equipment is reliable, flexible, accurate, and also must pass the crane installation and post-installation test to test.
4, the crane is a special job bear lifting machinery, in order to make the gantry crane into use rights can meet various load operational requirements, it must be no load on the crane, load, overload static and dynamic load tests. These tests must be the operating state of the lifting mechanism or specific location of a stationary state and the conducted. It also requires to be carried out after installation of the crane load test only after the transfer of use.
5, bridge gantry crane wire rope and other linear parts and many other parts will occur in some of the initial elongation under load, deformation, loose and so on. These must require the crane installation, commissioning loaded after correction for repair, adjustment, handling and reliable fastening, it must also be possible in the future safe and normal use of the crane.
Construction steel corrosion problems needing attention
Steel premature corrosion prevention, construction workers also need to be taken seriously enough, common overhead gantry crane in the component manufacturing and installation process needs to pay attention to the following points.
1 for the general case, it is appropriate drying, easy stencilled cold-curing coatings.
2 Universal gantry crane in the component manufacturing and field splicing process to ensure the quality of the weld, the weld material because of the complexity, easily forming an electrode, in the heat affected zone easily rust before painting needs butt seam slag, spatter thoroughly clean and clear.
3 special treatment has not been universal bridge gantry crane steel structure strictly prohibited direct contact with the soil, because the soil has a strong corrosive to steel. Contact with the soil at the bottom of the strength of concrete require a parcel, and to ensure a sufficient thickness of the protective layer.
4 steel components of joints (weld or bolt connections), not in the factory pre-spray paint, only at the site after installation, carefully clean up these sites, try to avoid component coating after welding, to combat integrity of the coating.
5. Factory production, processing good component to properly stacked, to avoid rust caused by secondary steel surface coating, resulting in unnecessary waste. Component of general hoist gantry crane damaged during transportation or installation of the coating should be cleaned promptly after installation in accordance with the relevant norms of the coating repair.
Gantry crane big wheel replacement repair Conditions
Replace or big wheel assembly gantry crane when some considerations:
1, check and replace the two shaft end nut has been tightened, locking nut loose backstop washer prevention, bearing clearance should not be too large or affect the normal operation of the bearing.
2, overhead gantry crane time after installing the bearing lubricant is added to idle after a few laps, so even attached to the bearing lubricant within the gland bolts should be tightened, prestressed to 100KN.
3, check the old and the new gantry crane bearing keyway is consistent (new bearing keyway is standard key size, the final sanding small 0.5mm easy to assemble).
4, check the coupling gear bore and the shaft outside the park, keys cope with the situation, it is best to test assembly.
5, the coupling gear installation, first check the shaft axis hoist gantry crane and gearbox output shaft is in the same line.
1, check and replace the two shaft end nut has been tightened, locking nut loose backstop washer prevention, bearing clearance should not be too large or affect the normal operation of the bearing.
2, overhead gantry crane time after installing the bearing lubricant is added to idle after a few laps, so even attached to the bearing lubricant within the gland bolts should be tightened, prestressed to 100KN.
3, check the old and the new gantry crane bearing keyway is consistent (new bearing keyway is standard key size, the final sanding small 0.5mm easy to assemble).
4, check the coupling gear bore and the shaft outside the park, keys cope with the situation, it is best to test assembly.
5, the coupling gear installation, first check the shaft axis hoist gantry crane and gearbox output shaft is in the same line.
Crane Installation Preparation and precautions
1, Universal overhead gantry crane to be familiar with before installing random drawings and technical data, according to the technical requirements, eliminate the transportation or errors caused by improper storage and deformation. If structural deformation, corrected before installation.
2, the installation should be checked before corroded, remove rust, dirt and if necessary, re-paint and assembly. Universal gantry crane parts should be flexible rotation of the rotation, the coupling portion of the solid and reliable connection. Bolt securely, pulleys, wheels roll operation should be flexible, bearings, etc. should be marked with the lubrication grease.
3, general handling hoist gantry crane avoid twisting, bending, impact and other accidents. Lifting girder should be bundled, such as non-bundled away. It must have the underlay strapping. Fundamental beam directly on the ground or drag member.
4, the storage should be placed smoothly and settle pad is, should be placed on a solid surface, not sinking, so universal bridge gantry crane metal structure deformation, when stored in the open air, should be properly kept, to have sunscreen preservative measures, such as There should try to drain the water.
2013年7月26日星期五
About Lifting energy saving aspects of the research
About Lifting energy saving aspects of the research
Lifting of the problems in energy efficiency, we must step by step, slowly down to earth step by step implementation from scratch. Universal bridge gantry crane on energy issues, not only our requirements, it is also our nation's current policy on sustainable development, and more related to our country's future.
We can consider reducing the general quality of their hoist gantry crane
the crane lowered their quality measures can consider lowering the quality of the hoisting mechanism. This will not only reduce their material consumption, but also reduces the load on the plant body. Specific measures are as follows: the use of high-quality motor, reducer; quality of the same capacity motor around a third more than in Germany, reducer materials, processing technology, etc., there are still serious deficiencies need from each link split break, only for Solution fundamental problems. Improve roll form; may consider using a large diameter reels, increasing rope capacity, reducing the size and quality of crane trolley. But requires the use of spiral bevel gear reduction ratio increases, the difficulty of making much larger.
The control system improvements. Speed control system to the frequency control system; frequency control system is not only efficient, but has better energy-saving effect. Improving universal overhead gantry crane drive; cranes, were equipped with engine driven off about 60% energy saving.
Universal gantry crane adopt new theories, new technologies, new materials, new processes, new ways. Can consider using new materials; such as high-strength nylon instead of cast iron or steel, not only to prolong life, but also to reduce noise. Maximize the use of H-beam instead of plates, the same material consumption can save the structure, but also get some increase flexural capacity. Using new technology; For example, to improve the coating process can be a good catch high quality anti-corrosion paint. Adopt new ways; country due to the national auto directory restrictions, to manufacture crane was first declare modified car job is quite difficult, requires government departments to coordinate to resolve, while abroad is not. The use of advanced design theory, the structure optimization, reduce structural weight.
Lifting of the problems in energy efficiency, we must step by step, slowly down to earth step by step implementation from scratch. Universal bridge gantry crane on energy issues, not only our requirements, it is also our nation's current policy on sustainable development, and more related to our country's future.
We can consider reducing the general quality of their hoist gantry crane
the crane lowered their quality measures can consider lowering the quality of the hoisting mechanism. This will not only reduce their material consumption, but also reduces the load on the plant body. Specific measures are as follows: the use of high-quality motor, reducer; quality of the same capacity motor around a third more than in Germany, reducer materials, processing technology, etc., there are still serious deficiencies need from each link split break, only for Solution fundamental problems. Improve roll form; may consider using a large diameter reels, increasing rope capacity, reducing the size and quality of crane trolley. But requires the use of spiral bevel gear reduction ratio increases, the difficulty of making much larger.
The control system improvements. Speed control system to the frequency control system; frequency control system is not only efficient, but has better energy-saving effect. Improving universal overhead gantry crane drive; cranes, were equipped with engine driven off about 60% energy saving.
Universal gantry crane adopt new theories, new technologies, new materials, new processes, new ways. Can consider using new materials; such as high-strength nylon instead of cast iron or steel, not only to prolong life, but also to reduce noise. Maximize the use of H-beam instead of plates, the same material consumption can save the structure, but also get some increase flexural capacity. Using new technology; For example, to improve the coating process can be a good catch high quality anti-corrosion paint. Adopt new ways; country due to the national auto directory restrictions, to manufacture crane was first declare modified car job is quite difficult, requires government departments to coordinate to resolve, while abroad is not. The use of advanced design theory, the structure optimization, reduce structural weight.
Gantry crane safety component failure repair instructions
Gantry crane safety component failure repair instructions
overhead gantry crane brakes are an important safety component, and its main function is the ability to prevent the hanging objects whereabouts. Normal door crane brake can play a good protection, but sometimes gantry crane brake failure can also occur, such as failure to appear, these failures will greatly affect the gantry crane safety.
hoist gantry crane these failures occur mainly due to large out of the brake pads, brake pads and the gap between too big or too small, too large brake wheel wear, the brake is not clean, loose bolts, main spring failure, lubricating oil used does not comply, the hinge has worn out or catching phenomenon, there is air in the hydraulic cylinder.
So how to prevent these failures do Mainly to regularly frequent door crane brakes do inspection and maintenance, inspection of the main contents include: hinges for binding and wear phenomena, bolts are secure, the hydraulic system is normal, active parts are normal, the East and wear between the brake band and so on.
The results need to be checked to determine whether the gantry crane brakes to work properly, if you find a problem it must be timely treatment, even if there is no problem to do well as regular maintenance, the only way to ensure the safety of bridge gantry crane s operations.
overhead gantry crane brakes are an important safety component, and its main function is the ability to prevent the hanging objects whereabouts. Normal door crane brake can play a good protection, but sometimes gantry crane brake failure can also occur, such as failure to appear, these failures will greatly affect the gantry crane safety.
hoist gantry crane these failures occur mainly due to large out of the brake pads, brake pads and the gap between too big or too small, too large brake wheel wear, the brake is not clean, loose bolts, main spring failure, lubricating oil used does not comply, the hinge has worn out or catching phenomenon, there is air in the hydraulic cylinder.
So how to prevent these failures do Mainly to regularly frequent door crane brakes do inspection and maintenance, inspection of the main contents include: hinges for binding and wear phenomena, bolts are secure, the hydraulic system is normal, active parts are normal, the East and wear between the brake band and so on.
The results need to be checked to determine whether the gantry crane brakes to work properly, if you find a problem it must be timely treatment, even if there is no problem to do well as regular maintenance, the only way to ensure the safety of bridge gantry crane s operations.
Universal gantry crane Industry Application Analysis
Universal gantry crane Industry Application Analysis
Lifting machinery industry frequency control system is mainly used frequency conversion technology and programmable logic control technology, the real drive load on the application of the reign of potential energy, can replace the traditional general-purpose overhead gantry crane control system, for manufacture of new equipment and existing equipment modification.
With electronic control technology, especially the development of frequency control technology very rapidly. VVVF speed control technology in many technical advantages will inevitably lead crane application frequency transformation of enterprises to improve the performance of lifting equipment. Meanwhile, with the common gantry cranes and other machinery industry, the drive will be configured with the science and technology and other factors to improve further the optimization and upgrading.
Universal hoist gantry crane domestic market in recent years, the rapid development, mainly due to a large development of the situation, namely the construction machinery industry as a whole in recent years the rapid development of the domestic market, in addition to the rapid development of Chinese bridge gantry crane export market is gratifying. Although in 2009 the international situation affected China's export market, but still optimistic about export markets, especially in emerging countries, the Chinese crane products cost-effective high, compared with foreign advanced products, functionality is also fully meet, so still great potential for development. If one of the gaps that currently China is still mainly rely on crane export price advantage, quality and service are still short board. According to 2010 data show that the first months of 2010, the growth rate seems faster than 2009.
Lifting machinery market has brought a variety of low-voltage inverter-based system advantages: avoiding large inrush current of the motor, increasing system reliability, extend equipment life, high control precision, reducing the overall cost of the equipment, improved the competitiveness of the machine, adjust torque compensation, to achieve precise control, universal gantry crane in the practical operation of future work, the more applied to the drive system, the drive application in this industry will continue to rise.
Lifting machinery industry frequency control system is mainly used frequency conversion technology and programmable logic control technology, the real drive load on the application of the reign of potential energy, can replace the traditional general-purpose overhead gantry crane control system, for manufacture of new equipment and existing equipment modification.
With electronic control technology, especially the development of frequency control technology very rapidly. VVVF speed control technology in many technical advantages will inevitably lead crane application frequency transformation of enterprises to improve the performance of lifting equipment. Meanwhile, with the common gantry cranes and other machinery industry, the drive will be configured with the science and technology and other factors to improve further the optimization and upgrading.
Universal hoist gantry crane domestic market in recent years, the rapid development, mainly due to a large development of the situation, namely the construction machinery industry as a whole in recent years the rapid development of the domestic market, in addition to the rapid development of Chinese bridge gantry crane export market is gratifying. Although in 2009 the international situation affected China's export market, but still optimistic about export markets, especially in emerging countries, the Chinese crane products cost-effective high, compared with foreign advanced products, functionality is also fully meet, so still great potential for development. If one of the gaps that currently China is still mainly rely on crane export price advantage, quality and service are still short board. According to 2010 data show that the first months of 2010, the growth rate seems faster than 2009.
Lifting machinery market has brought a variety of low-voltage inverter-based system advantages: avoiding large inrush current of the motor, increasing system reliability, extend equipment life, high control precision, reducing the overall cost of the equipment, improved the competitiveness of the machine, adjust torque compensation, to achieve precise control, universal gantry crane in the practical operation of future work, the more applied to the drive system, the drive application in this industry will continue to rise.
How to improve the mechanical acceptance of products
How to improve the mechanical acceptance of products
At present, the domestic brands and foreign brands compared to the user in mind there is a certain degree of recognition of the gap, some foreign company's products, domestic and international brands have a stable market position and loyal users. Users have their own yardstick to measure the quality of products, quality and long-term stability, reliability and cost-effective brand in markets such as hoist gantry crane s also high degree of recognition.
Despite the high price of foreign products, but the gantry cranes and other machinery regardless of how the market development, and always selling relatively stable. While domestic enterprises in this regard, there is obviously insufficient, need to redouble our efforts. In the future, high-growth industry conditions and the rapid expansion of space is difficult to appear, but there is potential for development of the industry, which requires the user to improve product quality, performance and brand awareness so more effort.
In this regard, some of the strategic vision of the business, gantry crane industry in rapid development period had been aware of this problem. Today the market downturn, some companies did not decline or declined slightly, even in the individual indicators also rose steadily.
These overhead gantry crane and other machinery enterprises not only in the development of a strategic vision, but also on the development of the industry itself and have a deep understanding. In the current market environment is not very stable, each enterprise must find their own market position as soon as possible, in a timely manner under the new situation work out development strategies, especially in improving product quality and is more cost-effective to make a great effort.
At present, the domestic brands and foreign brands compared to the user in mind there is a certain degree of recognition of the gap, some foreign company's products, domestic and international brands have a stable market position and loyal users. Users have their own yardstick to measure the quality of products, quality and long-term stability, reliability and cost-effective brand in markets such as hoist gantry crane s also high degree of recognition.
Despite the high price of foreign products, but the gantry cranes and other machinery regardless of how the market development, and always selling relatively stable. While domestic enterprises in this regard, there is obviously insufficient, need to redouble our efforts. In the future, high-growth industry conditions and the rapid expansion of space is difficult to appear, but there is potential for development of the industry, which requires the user to improve product quality, performance and brand awareness so more effort.
In this regard, some of the strategic vision of the business, gantry crane industry in rapid development period had been aware of this problem. Today the market downturn, some companies did not decline or declined slightly, even in the individual indicators also rose steadily.
These overhead gantry crane and other machinery enterprises not only in the development of a strategic vision, but also on the development of the industry itself and have a deep understanding. In the current market environment is not very stable, each enterprise must find their own market position as soon as possible, in a timely manner under the new situation work out development strategies, especially in improving product quality and is more cost-effective to make a great effort.
Construction machinery market should establish a correct understanding
Construction machinery market should establish a correct understanding
2011, continue to tighten the construction machinery market for construction machinery major business capital chain brought a lot of impact, so whether agents or bridge gantry crane manufacturers in the market downturn have increased the debt management, in order to minimize the impact of adverse business. But even so, some manufacturers, agents for debt management is still not a correct understanding.
Some agents believe that the market situation is bad debt management can reduce the risk of capital chain, while the overhead gantry crane market situation has improved, debt management can be appropriately reduced, especially sales letter before the trial work, fear of adverse sales impact, "delay" to seize market share. In addition, the agents vulnerable to aggressive sales policy makers influence of various factors under the debt management agencies tend to eye, close one eye.
Indeed, gantry crane sales season, the agent for the increased sales, anxious to all staff assigned to the sales line, ignoring important letter debt management aspects of the trial seems to take for granted. Letter trial motions, the trial letter letter appears in all kinds of violations of established trial system problems, often nobody cares.
However, the market experienced a downturn, capital chain crisis manufacturer, dealer should understand that regardless of hoist gantry crane and other machinery market is good or bad, debt management should not relax, after all, as long as the sale of non-settlement of the full amount, the carrying on of the profits also "drift" in the market, only the accounts receivable into cash income, profit before landing.
2011, continue to tighten the construction machinery market for construction machinery major business capital chain brought a lot of impact, so whether agents or bridge gantry crane manufacturers in the market downturn have increased the debt management, in order to minimize the impact of adverse business. But even so, some manufacturers, agents for debt management is still not a correct understanding.
Some agents believe that the market situation is bad debt management can reduce the risk of capital chain, while the overhead gantry crane market situation has improved, debt management can be appropriately reduced, especially sales letter before the trial work, fear of adverse sales impact, "delay" to seize market share. In addition, the agents vulnerable to aggressive sales policy makers influence of various factors under the debt management agencies tend to eye, close one eye.
Indeed, gantry crane sales season, the agent for the increased sales, anxious to all staff assigned to the sales line, ignoring important letter debt management aspects of the trial seems to take for granted. Letter trial motions, the trial letter letter appears in all kinds of violations of established trial system problems, often nobody cares.
However, the market experienced a downturn, capital chain crisis manufacturer, dealer should understand that regardless of hoist gantry crane and other machinery market is good or bad, debt management should not relax, after all, as long as the sale of non-settlement of the full amount, the carrying on of the profits also "drift" in the market, only the accounts receivable into cash income, profit before landing.
Suggest new machine is still mainly mechanical products, safe and reliable
Suggest new machine is still mainly mechanical products, safe and reliable
Our users need a common overhead gantry crane and other machinery and equipment is high reliability, durability of equipment, which is completely dependent on our host production of new equipment to offer, but used construction equipment difficult to meet the reliability and durability, and As the period of use has been increasing, the problems exposed second-hand equipment will be more and more, this is one aspect.
Since the second quarter of 2011 to the present 26 consecutive months of industrial restructuring, China Universal gantry crane industry constantly swinging back and constantly upgrade and national call us to adjust the structure, transfer mode, skills in a very important position, but also It should be said at this stage that we meet the market demand for the industry, for the country, for the market to turn in a satisfactory answer. But second-hand construction machinery equipment, energy conservation, environmental protection green, intelligence and other aspects it has limitations.
Is China's national conditions, fog and haze last year more than one hundred days continuously, until now, our environmental problems lead to universal bridge gantry crane and other machinery and equipment requirements are high, then the Chinese market, we should also put energy reduction, intelligent in an important direction, and second-hand equipment in this regard is not.
Based on the above considerations, I personally believe that, look at all aspects, from the overall situation, the current domestic general gantry cranes and other machinery market still need a new machine-based, supplemented by second-hand equipment.
Our users need a common overhead gantry crane and other machinery and equipment is high reliability, durability of equipment, which is completely dependent on our host production of new equipment to offer, but used construction equipment difficult to meet the reliability and durability, and As the period of use has been increasing, the problems exposed second-hand equipment will be more and more, this is one aspect.
Since the second quarter of 2011 to the present 26 consecutive months of industrial restructuring, China Universal gantry crane industry constantly swinging back and constantly upgrade and national call us to adjust the structure, transfer mode, skills in a very important position, but also It should be said at this stage that we meet the market demand for the industry, for the country, for the market to turn in a satisfactory answer. But second-hand construction machinery equipment, energy conservation, environmental protection green, intelligence and other aspects it has limitations.
Is China's national conditions, fog and haze last year more than one hundred days continuously, until now, our environmental problems lead to universal bridge gantry crane and other machinery and equipment requirements are high, then the Chinese market, we should also put energy reduction, intelligent in an important direction, and second-hand equipment in this regard is not.
Based on the above considerations, I personally believe that, look at all aspects, from the overall situation, the current domestic general gantry cranes and other machinery market still need a new machine-based, supplemented by second-hand equipment.
Most construction machinery enterprises accounts receivable risk increased sharply reasons
Most construction machinery enterprises accounts receivable risk increased sharply reasons
In road construction machinery enterprises in the recovery of the difficulties ahead for those who hinder adopted piecemeal, they are often not so smooth. A lot of "hidden" factors tend to become a "killer" from Universal overhead gantry crane and other machinery industry unseen angles, eroding seemingly full of hope.
Inventory did not go, infrastructure investment pressure, lack of domestic technology, lack of investment in research, innovation, and accounts receivable increased pressure surge funds, among other factors, hindering the current construction machinery warmer. Now, Universal bridge gantry crane and other construction machinery industry as a whole has come out of the golden years, the development of this should be stable, because of the vicious competition brought credit sales and technical issues, in dire straits.
Fortunately, the construction machinery industry professionals have been aware of these stumbling block to hinder development of the industry. Now in the country, major enterprises have adopted a variety of ways to improve product quality, to open the market to the world.
Most engineering machinery enterprise risk of accounts receivable increased sharply, the fundamental reason is the use of aggressive credit sales model. Indeed, in order to pursue large number of orders, general gantry cranes and other machinery industry sales appeared zero down phenomenon. These aggressive sales model to bring the most important risk of listed companies is driving sales scale, while pushing up the accounts receivable; another mortgage sales process if the customer is delinquent enterprises are facing the risk to the bank repo equipment, and financing leasing installments of payment cycle will be diverted enterprises large amounts of cash, which have a direct impact on business cash flow.
Later, catch common gantry cranes and other construction machinery industry into an unprecedented market downturn. As the downstream environment is not good, so many end users reduce the operation rate of repayment ability is limited. Corporate receivables pressure surge, this vicious cycle become an obstacle to the majority of enterprises unable to move.
In road construction machinery enterprises in the recovery of the difficulties ahead for those who hinder adopted piecemeal, they are often not so smooth. A lot of "hidden" factors tend to become a "killer" from Universal overhead gantry crane and other machinery industry unseen angles, eroding seemingly full of hope.
Inventory did not go, infrastructure investment pressure, lack of domestic technology, lack of investment in research, innovation, and accounts receivable increased pressure surge funds, among other factors, hindering the current construction machinery warmer. Now, Universal bridge gantry crane and other construction machinery industry as a whole has come out of the golden years, the development of this should be stable, because of the vicious competition brought credit sales and technical issues, in dire straits.
Fortunately, the construction machinery industry professionals have been aware of these stumbling block to hinder development of the industry. Now in the country, major enterprises have adopted a variety of ways to improve product quality, to open the market to the world.
Most engineering machinery enterprise risk of accounts receivable increased sharply, the fundamental reason is the use of aggressive credit sales model. Indeed, in order to pursue large number of orders, general gantry cranes and other machinery industry sales appeared zero down phenomenon. These aggressive sales model to bring the most important risk of listed companies is driving sales scale, while pushing up the accounts receivable; another mortgage sales process if the customer is delinquent enterprises are facing the risk to the bank repo equipment, and financing leasing installments of payment cycle will be diverted enterprises large amounts of cash, which have a direct impact on business cash flow.
Later, catch common gantry cranes and other construction machinery industry into an unprecedented market downturn. As the downstream environment is not good, so many end users reduce the operation rate of repayment ability is limited. Corporate receivables pressure surge, this vicious cycle become an obstacle to the majority of enterprises unable to move.
How to treat the complex international situation
How to treat the complex international situation
The current international economic situation is complicated, China Universal bridge gantry crane and other machinery market pressures. How do you see the current economic situation Chinese ability across middle-income trap Why must accelerate economic transformation and upgrading.
From the long-term economic growth perspective, with the Chinese General overhead bridge crane and other machinery production increases, the potential economic growth rate will gradually decline. 2013 a quarter of China's GDP grew by 7.7%, lower than market expectations, but also from the second quarter of 2012, four consecutive quarters less than 8%, indicating that the Chinese economy is entering from the rapid growth in the high-growth period. This is the stage of industrialization developed countries and Latin American countries during the transition phase towards urbanization potential decline in growth consistent with the change.
From the current emergence of some clear signs of decline such as capital and labor flexibility increased flexibility, accelerated demographic transition, common overhead gantry crane and other machinery to improve productivity slowdown, more restrictive carbon emissions, energy conservation standards to improve capital efficiency diminishing perspective, China economic slowdown trend is inevitable, the existing investment-driven growth model is unsustainable. Chinese long-term potential growth rate dropped 7% to 8% in line with economic laws.
Further development of industrialization. China has entered the late stages of industrialization, but regional differences are large, industrialized eastern region has reached a very high level, while the level of industrialization in the central and western regions is still low; from the regional industrial structure, each region in the common gantry cranes and other mechanical technology level, product-level exist isomorphism, this similar industrial structure needs to be optimized.
The current international economic situation is complicated, China Universal bridge gantry crane and other machinery market pressures. How do you see the current economic situation Chinese ability across middle-income trap Why must accelerate economic transformation and upgrading.
From the long-term economic growth perspective, with the Chinese General overhead bridge crane and other machinery production increases, the potential economic growth rate will gradually decline. 2013 a quarter of China's GDP grew by 7.7%, lower than market expectations, but also from the second quarter of 2012, four consecutive quarters less than 8%, indicating that the Chinese economy is entering from the rapid growth in the high-growth period. This is the stage of industrialization developed countries and Latin American countries during the transition phase towards urbanization potential decline in growth consistent with the change.
From the current emergence of some clear signs of decline such as capital and labor flexibility increased flexibility, accelerated demographic transition, common overhead gantry crane and other machinery to improve productivity slowdown, more restrictive carbon emissions, energy conservation standards to improve capital efficiency diminishing perspective, China economic slowdown trend is inevitable, the existing investment-driven growth model is unsustainable. Chinese long-term potential growth rate dropped 7% to 8% in line with economic laws.
Further development of industrialization. China has entered the late stages of industrialization, but regional differences are large, industrialized eastern region has reached a very high level, while the level of industrialization in the central and western regions is still low; from the regional industrial structure, each region in the common gantry cranes and other mechanical technology level, product-level exist isomorphism, this similar industrial structure needs to be optimized.
gantry crane's daily care and maintenance mode (a)
1, routine maintenance
(A) cleaning the outer surface of the cab and the body of dust and grease; thoroughly cleaned once a week;
(2) Check the brake clearance is appropriate;
(3) Check coupling and coupling key on the bolts are tightened;
(4) Check the bells, the safety device is reliable;
(5) Check the brake pads and wire rope for wear;
(6) overhead gantry crane that checks whether the controller contacts close and the motor brush wear stickers fit the situation.
2, a maintenance (once a month)
(A) to the rolling oil;
(2) Check all electrical equipment insulation;
(3) control panel, protection panel, controller, resistors and the Terminal Block Terminal screws are tightened.
(4) Check the gearbox oil, brake oil and lubricating rolling electromagnet situation.
(5) Check the transmission noise, speed, operating current is normal.
3, two maintenance (quarterly)
(1) Check the rail wear, deformation; check the wear of the wheel.
(2) Check the hook wear, deformation, in particular the opening degree of the change.
(3) check and adjust the big car, winch drive mechanism such as a motor, gear box mounted on the situation.
(4) bridge gantry crane recommended to check the wear of wire rope on the drum and fixed the situation.
What are the common gantry crane hydraulic system failure (three)
What are the common
overhead gantry crane hydraulic system failure (three)
Finally malfunctioning. By the operation of the hydraulic system control shows that when an operation fails, the reason for the failure appears on the pilot control the majority of oil and electromagnetic control part, the probability of failure of the main oil line work is minimal. A company of a Taiwan KH700-2 crawler crane outrigger cylinder occurred fault can not be extended. Check the control circuit switches the first leg of the solenoid valve, found that the solenoid valve does not (to determine whether the operation of the solenoid valve, can rely on hearing, touch and other methods to confirm that the solenoid valve operation, and can hear a "click" sound; touch the body, especially when the spool end, can feel the obvious shock).
But using a multimeter to check the solenoid valve coil freewheeling diode is intact, the line are all normal, you can confirm the fault occurs inside the solenoid. overhead bridge crane Internal solenoid valve malfunction may have the following two reasons: First, the work coil damage (short circuit or open circuit, burning), and second spool is catching. Good wheeling diode in the coil case, the probability of damage to the coil should be small; further tested with a multimeter the coil, the coil resistance displayed in the normal range, the coil is intact. The valve spools are impurities found stuck disintegration, can slide in the valve body. First with gasoline on the body and spool repeated cleaning, make sure to clean later, and then the hydraulic oil clean again, and then re-assembled and installed to the original position, start the mechanical test machine, everything is back to normal.
Finally malfunctioning. By the operation of the hydraulic system control shows that when an operation fails, the reason for the failure appears on the pilot control the majority of oil and electromagnetic control part, the probability of failure of the main oil line work is minimal. A company of a Taiwan KH700-2 crawler crane outrigger cylinder occurred fault can not be extended. Check the control circuit switches the first leg of the solenoid valve, found that the solenoid valve does not (to determine whether the operation of the solenoid valve, can rely on hearing, touch and other methods to confirm that the solenoid valve operation, and can hear a "click" sound; touch the body, especially when the spool end, can feel the obvious shock).
But using a multimeter to check the solenoid valve coil freewheeling diode is intact, the line are all normal, you can confirm the fault occurs inside the solenoid. overhead bridge crane Internal solenoid valve malfunction may have the following two reasons: First, the work coil damage (short circuit or open circuit, burning), and second spool is catching. Good wheeling diode in the coil case, the probability of damage to the coil should be small; further tested with a multimeter the coil, the coil resistance displayed in the normal range, the coil is intact. The valve spools are impurities found stuck disintegration, can slide in the valve body. First with gasoline on the body and spool repeated cleaning, make sure to clean later, and then the hydraulic oil clean again, and then re-assembled and installed to the original position, start the mechanical test machine, everything is back to normal.
What are the common gantry crane hydraulic system failure (two)
What are the common
overhead gantry crane hydraulic system failure (two)
Followed by the action too slow. Actuator hydraulic system mainly refers to the hydraulic motor and the hydraulic cylinder. If the actuator action is too slow, ① hydraulic motor or hydraulic cylinder own fault, such as severe internal leakage or leakage which can result in slow movements and actions weakness. ② Because the hydraulic motor or hydraulic cylinder flow decreases due, which in turn points two reasons, first, the hydraulic pump to pump flow decreases, such as severe internal leakage, can significantly reduce the pump flow rate, the variable pump , the pump flow and the impact of regulation by itself, sometimes due to improper adjustment flow rate decreases; Second, the control valves and piping failures, such as the valve opening degree of catching the decrease, resulting in lower flow rate, if the Hydraulic oil and other foreign matter mixed into the yarn, the pipeline flow is reduced also cause blockage. A KH700-2 crawler crane manufacturers combined pump overhaul by a professional, found all movements are slow, and the speed is still less than the pre-overhaul of 1/3. This can basically rule out oil or actuator causes are blocked unless all oil or hydraulic motor fails, it is almost impossible. Only the root causes of failure in the hydraulic pump, the pump flow is reduced. After the pump, it was discovered that the ends of the pump flow control valve to adjust properly due to re-adjust after correction flow restoration, all the action is also restored to the original design speed.
A KH180-3 crawler bridge gantry crane lewing brake solenoid valve due to poor work to understand medical repair. In the valve body to be demolished, since the valve body is symmetrical oil passage, the spool structure is essentially the same longitudinal direction, I think that the valve body in the longitudinal direction can be interchanged. Therefore, during operation, is not necessary to mark its direction. But after re-assembly, machine work slow (less than the original speed of 1/2 of the maintenance work carried out only cleaned the solenoid valve, the problem probably lies in the disintegration over the solenoid valve, but the solenoid valve in the work no other anomalies. finally decided to re-disintegration of the solenoid valve After careful measurements on the spool, the spool ends glossy found some deficiencies in length with 1mil differences, which previously suspected The valve installed backwards, then has changed the direction of the spool reassembled everything back to normal after installation.
Followed by the action too slow. Actuator hydraulic system mainly refers to the hydraulic motor and the hydraulic cylinder. If the actuator action is too slow, ① hydraulic motor or hydraulic cylinder own fault, such as severe internal leakage or leakage which can result in slow movements and actions weakness. ② Because the hydraulic motor or hydraulic cylinder flow decreases due, which in turn points two reasons, first, the hydraulic pump to pump flow decreases, such as severe internal leakage, can significantly reduce the pump flow rate, the variable pump , the pump flow and the impact of regulation by itself, sometimes due to improper adjustment flow rate decreases; Second, the control valves and piping failures, such as the valve opening degree of catching the decrease, resulting in lower flow rate, if the Hydraulic oil and other foreign matter mixed into the yarn, the pipeline flow is reduced also cause blockage. A KH700-2 crawler crane manufacturers combined pump overhaul by a professional, found all movements are slow, and the speed is still less than the pre-overhaul of 1/3. This can basically rule out oil or actuator causes are blocked unless all oil or hydraulic motor fails, it is almost impossible. Only the root causes of failure in the hydraulic pump, the pump flow is reduced. After the pump, it was discovered that the ends of the pump flow control valve to adjust properly due to re-adjust after correction flow restoration, all the action is also restored to the original design speed.
A KH180-3 crawler bridge gantry crane lewing brake solenoid valve due to poor work to understand medical repair. In the valve body to be demolished, since the valve body is symmetrical oil passage, the spool structure is essentially the same longitudinal direction, I think that the valve body in the longitudinal direction can be interchanged. Therefore, during operation, is not necessary to mark its direction. But after re-assembly, machine work slow (less than the original speed of 1/2 of the maintenance work carried out only cleaned the solenoid valve, the problem probably lies in the disintegration over the solenoid valve, but the solenoid valve in the work no other anomalies. finally decided to re-disintegration of the solenoid valve After careful measurements on the spool, the spool ends glossy found some deficiencies in length with 1mil differences, which previously suspected The valve installed backwards, then has changed the direction of the spool reassembled everything back to normal after installation.
What are the common gantry crane hydraulic system failure (a)
What are the common
overhead gantry crane hydraulic system failure
The first is the actuator action weakness. Hydraulic motor or hydraulic cylinder action inability reasons two: First, because the system pressure limiting valve (safety valve) tuning pressure is low, or if the valve is working poor or damaged; Second, because the system leaks (including hydraulic pumps, motors, hydraulic cylinders, valves and external piping system leaks) result in partial or full system pressure is insufficient. A Taiwan KH180-3 crawler crane lifting a bridge during work, sudden weakness of the arm with load newcomer fault. The inspection found that rotary valve (the valve is operating room by a direct operation of the operating lever, without pilot control system) more serious oil spill. Rotary aircraft hydraulic systems rely on the same system with a hydraulic luffing oil, turning serious leak valve rotation operation although no major impact, but causes connected with this oil boom system significantly reduced the pressure within the In this pressure, the no-load state arm still capable of maintaining the ups and downs, but when the arm load is heavy, can not be maintained from the arm. This rotary valve disintegration of inspection, found that some serious aging seals, O-rings in which a small part of the remaining remnants, resulting in a large number of hydraulic fluid leakage. Replaced with a new seal, the bridge gantry crane weak arm trouble since been completely ruled out.
The first is the actuator action weakness. Hydraulic motor or hydraulic cylinder action inability reasons two: First, because the system pressure limiting valve (safety valve) tuning pressure is low, or if the valve is working poor or damaged; Second, because the system leaks (including hydraulic pumps, motors, hydraulic cylinders, valves and external piping system leaks) result in partial or full system pressure is insufficient. A Taiwan KH180-3 crawler crane lifting a bridge during work, sudden weakness of the arm with load newcomer fault. The inspection found that rotary valve (the valve is operating room by a direct operation of the operating lever, without pilot control system) more serious oil spill. Rotary aircraft hydraulic systems rely on the same system with a hydraulic luffing oil, turning serious leak valve rotation operation although no major impact, but causes connected with this oil boom system significantly reduced the pressure within the In this pressure, the no-load state arm still capable of maintaining the ups and downs, but when the arm load is heavy, can not be maintained from the arm. This rotary valve disintegration of inspection, found that some serious aging seals, O-rings in which a small part of the remaining remnants, resulting in a large number of hydraulic fluid leakage. Replaced with a new seal, the bridge gantry crane weak arm trouble since been completely ruled out.
Gantry crane manufacturers to explain the design overhaul Taiwan
bridge gantry crane manufacturer maintenance station to explain the design:
①, repair station installation location: at the general layout of the rigid leg.
②, repair station for a group of two. Can be designed as a fixed type. Between two maintenance units have electric hoist through space. Distance: 800 mm.
③, overhaul flat-screen distance away from the beam bottom flange of 1400 mm. This highly convenient for maintenance hoist.
④, overhaul platform length: generally the rigid outrigger width. Objective: easy installation.
⑤, repair station frame with the 8th channel production. With 3 mm thick textured board veneer. Objective: To slip.
⑥, 1050 mm high maintenance stage of the fence. Fence on the baseboards, to prevent tools fall.
⑦, repair station to connect one end of legs reinforced with a triangular plate welding.
⑧, overhead gantry crane proposals overhaul Taiwan indent the other end of 300-400 mm, with a flat iron two-4X60 with legs welded connection. Purpose: electric hoist trolley slip line (rubber line) interfere with the maintenance station run time.
⑨, overhaul bed design computational load: 2500N / / m ^ 2.
The design method of the rain cover
Rain cover design method is as follows:
①, small tonnage, small span bridge gantry crane Rain cover arranged at the rigid legs. In the main beam winding installation. In the maintenance table above. Rain cover a length greater than the length of hoist.
②, large tonnage, large span gantry crane. Rain cover arranged at the rigid legs. In the main beam-beam top flange installation. In the maintenance table above. Rain cover a length greater than the length of hoist. Width :1200-2000 mm.
③, rain cover the top of the slope, to facilitate drainage.
④, overhead bridge crane recommendations rain cover skeleton with angle production. Panel thickness 1-1.5 mm spot light board on the skeleton.
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