The safety of the crane is used

Overview of a certain steel company mainspan no.2 steelmaking plant a hook bridge crane hoisting the steel slag, caused by secondary hook header to vice hook to hang spreader collision girder falling, applied on the surface of the hit to death a line homework personnel. At the scene of the accident to a steel mill mainspan, engaged in hoist gantry crane transportation operations lifting equipment is a hook double beam crane, crane rated lifting weight G = 30/10 t S = 19.5 m, span, lifting height H = 16 m, lifting speed.vn = 7.5 n/min, the crane cart running speed vitamin k = 87.6 m/min, the car speed vitamin k = 42.4 m/min, crane work volume for the A5. Accident process for a crane driver at the end of a set of the lifting process, vice hook back, move the hook to assignments, a vice steel crane in the ascent of the at the same time, moved the main hook of crane load, and all the attention focused on the main hook run down, and did not pay attention to pair of hook lifting operation, the secondary hook collision with girder summit, vice hook hook line's fall from 16 m altitude and hit the ground line personnel b, caused b serious accident died on the spot.

Crane (car) of the wheel rim contact with the side of the track

Crane (car) of the wheel rim contact with the side of the track, friction and wear in the running process of a kind of phenomenon. Wheel steel crane and the theory of unilateral clearance on the side of the track can generally be classified as 5 ~ 15 mm, as long as crane (car) in the process of running wheels horizontal offset is greater than this value, gnaw rail occurs, it is gnaw rail boundary conditions. Gnaw rail serious when although crane can not continue to use, but flange and rail friction will increase, will affect the service life of some components, to use causes pecuniary loss to unit. For sino hoist span bridge crane, due to factors such as manufacturing, car easy to gnaw rail accidents. Based on this, this paper analyzes the reasons of large span thin sorghum gnaw rail, put forward the corresponding countermeasures and improvement methods is very necessary. Bridge crane gnaw rail car cause analysis for large size hook bridge crane, in the use of more than a year later, often find crane gnaw rail car phenomenon, and all is the car outside rim gnaw rail to readjust the car wheel after the parallelism and perpendicularity to conform to the requirements, still did not solve the problem.

Multi-function crane is the main equipment in the electrolytic aluminum industry workshop electrolytic workshop

PTM itself structure and is sino hoist used in domestic industrial workshop of ordinary crown difference is bigger, end of PTM has several across the car, and asymmetric arrangement on both sides, on one side of the crane load of this kind of PTM is larger, are different from common crane, and use very frequently. As a result, the steel crane beams under the action of the PTM mechanical performance analysis, understand the crane beam under complex hoist gantry crane load stress mechanism has certain practical value. To this end, this paper conducted the following work: through ANSYS finite element software simulation analysis, extract the different span and different braking structure of multi-function crane beam under load condition and load condition 2 is one of the most disadvantageous section internal force value. Reference for ordinary steel structure design specification of steel crane beam of bridge crane design standard, for multi-function steel crane beam system strength, deflection, stability calculation, and the multi-function crane beam system to evaluate the amount of steel. Through the ANSYS eigenvalue buckling analysis, considering the different load condition, different span of space model, the multi-function steel crane beam system for elastic stability bearing capacity analysis, draw a multi-functional steel crane beam system linear elastic phase of the buckling load and buckling mode.

The status of the large lifting equipment

Where in the world worse than foreign domestic hoisting equipment condition of large hoisting equipment, marks a national engineering machinery manufacturing capacity, determine the traffic construction speed and quality. Our country really started to manufacture large transport machinery lifting equipment in the 70 s, after nearly 30 years of hoist gantry crane exploration, has made great development. Large hoisting equipment level of design capability, manufacturing, lifting load and the intrinsic quality, mechanical properties and the contents of science and technology, continuously leapfrog development. At present, is moving toward product seriation, variety diversification, sino hoist operation, intelligent operation and performance of modern direction. $$in recent years, our country developed successfully developed large hoisting equipment, and identified by authority department has been close to or reached the current international advanced level. And initially formed the development of generation, research generation, reserve generation of production pattern. Based $$$$from scratch to lay looking back the development course we may see that the first 20 years since the founding of new China, our country because do not have the ability to create large lifting equipment, lead to transportation and engineering infrastructure used imports all large lifting equipment. $$in the next few years, our country successfully developed the 38 meters high, weight of 140 tons, the hoisting with 10 tons of port portal crane M10-25 type.

Virtual prototype implementation of double beam bridge crane

Virtual prototype implementation of double beam bridge crane, virtual prototype technology can save on time and money for the designer, so once available, for the vast number of engineering and technical personnel has a great attraction. The virtual prototype technology in the aerospace, weapons manufacturing, engineering machinery, automobile sino hoist and other fields has been widely used in double beam bridge crane as the object of virtual design, application of solidworks 3 d modeling software to complete the bridge crane virtual prototype modeling and assembly of parts and engine. Bridge crane bridge crane can be divided into 2 d assembly model of single girder bridge crane, double girder bridge crane, gm bridge crane, etc. Bridge crane equipment; The car run institutions; Bridge structure; The cab; Block and tackle. Supporting institutions; Cart orbital plane figure bridge crane structure schematic virtual prototype design bridge crane parts hoist gantry crane modeling parts parameterized modeling, first determine the design scheme of bridge crane, then apply solidworks software components of the three-dimensional model is set up, and carries on the parametric design. In the process of parameterized modeling, designer need only a part of sketch of some numerical modeling parameters (length, Angle, etc.) was analyzed and modified.

The use of deep resources

Deep shallow earth resources depleted, the utilization of resources is imperative. But now the use of these resources is very difficult, such as mineral hoisting sino hoist from now hundreds of meters to thousands of meters, the existing technology ascension is difficult or can't do it. Has been proved more than 1500 m deep mineral how to mining? With a bold the diameter of the wire rope or increasing the number of effective? Is the line, this choice is reasonable? The handkerchief to ascend, because the whole series of safety problems in a string so its safety coefficient is high, generally in 5 ~ 9. The higher the hoisting height, the bigger the material hoist gantry crane. Rope is coarse, elevator design and manufacture of the greater difficulty will be. Installation, use and change the rope work more difficult. Such as hoisting height above 1500 m, rope only a weight has been considerable. Mine production conditions, due to causes corrosion and other mechanical damage to the steel wire rope, the use fixed number of year, generally very short, every change once caused great waste of resources, and influence the mine production.

Crane beam is the subgrade support girder vehicle running

Crane beam is the subgrade support girder vehicle running, used in steel structure factory building. Crane rail crane beam, truss car by driving back and forth on the crane beam orbit. Like steel crane beam, the difference between crane beam web plate welding with steel crane plate, provide support for lift girder car lifting heavy objects. Welding crane beam flange plate of the appropriate USES a layer of steel plate, when two layers of steel plate is used, the outer plate should be along the long Liang Tong Settings, and in the design and construction sino hoist should be taken to make the top flange closely contact with two layers of steel plate. Supporting clamp or rigid material rake hard hook crane and similar structure, truss and brake truss crane is unfavorable use. Crane Liang Yi flange or web of welding arc plates with stitching should be adopted and lead plate, penetration butt weld arc plate and lead plate cutting place should be polished smooth. Crane beam welding and welding construction crane truss segment splicing welding should be adopted or friction type high strength bolt connection.

Simple beam bridge crane type

imple beam bridge crane type:

Hot metal ladle crane: used for lifting into the mixer, the molten steel into concast steel furnace and lifting equipment or ingot mould etc. Main car lifting bucket, deputy car to steel crane bucket and so on auxiliary work.

Clamp crane: use clamp to high temperature steel ingot vertically to the pit in soaking pit, or put it out in the ingot of the car.

Stripping crane: for the ingot from the ingot mould forced out. Car have special stripping device, stripping way according to the shape of the mold, some with pole pin ingot ingot crane, use tongs to lodge a mold; Some use tongs pressure mold, with a small pliers ingot.

Loading crane: for the charge to the open hearth furnace. Main car column bottom is equipped with ram, to stir up inside the container and send it to charging. The main column around the vertical axis rotation, ram can be bobbing up and down and turning. Vice car used to repair the furnace sino hoist as auxiliary operations.

Forging crane: to cooperate with hydraulic press forging large workpiece. Main car hanging on the hook special feeder, turned to support and artifacts; The car used to lift the artifacts.

Bridge type crane can be over rectangular court and its operation

Bridge type crane can be above the rectangle area and its operation, more used in the place such as workshop, warehouse, open storage of goods loading and unloading, a beam crane, bridge crane, gantry crane, cable sino hoist, vehicle bridge, etc. (1) beam crane: mainly including single girder bridge crane girder crane and double beam bridge crane cranes single-beam bridge crane bridge girder with h type steel or steel section and steel plate combination. Lifting trolley is often chain hoist, electric hoist, or used as lifting mechanism parts assembled. According to the bridge bearing type and suspension type two kinds. The former bridge along the car on the beam of crane orbit; The bridge along the hanging in the workshop crane orbit under the roof. Single girder bridge crane, electric two break up. Manual single-beam bridge crane institutions working speed is low, the weight is small, but its quality is small, easy to organize production, the cost is low, when used for the power supply after carrying hoist gantry crane is not big, requirements for speed and productivity is not high. Manual single-beam bridge crane using manual monorail trolley as a running car, with the hand chain hoist as lifting mechanism, the bridge is made up of main girder and end beam. Main girder with single beams, beam with steel or bending molding steel plate welded.

Bridge crane can be divided into general bridge crane, simple beam bridge crane and metallurgical special bridge crane 3 kinds

Bridge crane is widely used in indoor and outdoor warehouses, factories, docks and outdoor storage yard, etc. Bridge crane can be divided into general bridge crane, simple beam bridge crane and metallurgical special bridge crane 3 kinds. General bridge According to the frame structure bysino hoistthe car, general bridge operation, the structure of the bridge metal composition. Lifting trolley and running institutions by the lifting mechanism, the car and the car frame of three parts. Lifting mechanism including motor, brake, reducer, drum and pulley. Motor through the gear reducer, drive the drum rotation, make wound reel or wire rope from the reel down, to lift heavy things. The car frame is bracket and install the lifting mechanism and car running parts, such as organization frame, usually for welding structure. Gantry crane is generally based on the door frame structure form, the form of main girder, sling for classification. hoist gantry crane used in port.

(a) the whole gantry crane: no overhanging girder, the car in the main span.

(b) a gantry crane: leg height difference, can be used according to the field of civil engineering request.

(c) double cantilever gantry crane: one of the most common structure form, the structure of the force and the area of effective utilization is reasonable.

(d) of single cantilever gantry crane: this kind of structure is often chosen by site restrictions.

According to the main girder structure

(a) single girder gantry crane

The characteristics of the arm crane and bridge crane are basically the same. Can work, over the round ground and widely used at open handling and installation work, such as a door crane, floating crane, mast cranes, crane and deck crane, etc.

Arm crane include lifting mechanism, luffing mechanism, rotating mechanism. Rely on these institutions cooperate with action, can make the weight lifting and handling within a cylindrical space. Arm crane installed on vehicles, or other forms of transport (mobile) tools, thus constitute the arm posture slewing crane operation. Such as auto crane, wheel crane, tower crane, portal crane, floating crane, rail crane, etc.