usually for welding structure

General bridge crane lifting trolley generally, running mechanism, workshop crane metal structure of bridge. The crab by the hoisting mechanism, car run institutions and small frame is composed of three parts.The lifting mechanism comprises a motor, brake, reducer, drum and pulley blocks. Motor through reducer, driven rotating drum, so that the wire rope around the drum or from the roll down, semi gantry cranes to lift heavy objects. Small frame is a supporting and installation rack lifting mechanism and operation of institutions such as car parts, usually for welding structure.