Analysis of bridge cranes

overhead bridge crane is the bridge in orbit a bridge crane, also known as the crane. Bridge crane bridge laying on both sides along the elevated tracks run vertically, lifting trolley along the track on the bridge laying sideways to form a rectangle scope of work, you can take advantage of the space under the bridge lifting materials, not hampered by ground equipment.

   Bridge crane is widely used in indoor and outdoor warehouses, factories, docks and open storage yard, etc.. Bridge crane bridge crane can be divided into ordinary, simple beam bridge crane bridge crane and metallurgical dedicated three.

       General  bridge gantry crane  generally lifting trolley bridge operating agencies, bridge metal structures. Lifting trolley and the hoisting mechanism, trolley run institutions and small frame of three parts.

       Lifting mechanism includes a motor, brake, reducer, drum and pulley. Motor through reducer, driving drum rotation, so that the wire rope around the drum or from a roll down to lift heavy loads. Small frame and mounting bracket is lifting mechanism and trolley run institutions and other parts of the rack, usually welded structure.

       Crane drive mechanism can be divided into two categories: one for the central drive, which uses an electric motor to drive long shaft-driven initiatives on both sides of the wheel; another is separately driven, that is active on both sides of each wheel with a single motor. Medium and small bridge cranes more use brakes, gear units and motors combined into one "triple play" drive mode, a large common hoist gantry crane
 lifting weight for ease of installation and adjustment, universal coupling drive device often used .

       Crane agencies generally only four driving and driven wheels, if the starting weight is large, common approaches to reduce the wheel increases wheel pressure. When more than four wheels, a frame must be balanced hinge device, the crane load is evenly distributed on each wheel.