Hook bridge crane is a widely used lifting machinery, mainly composed of box shaped bridge, lifting trolley, crane operating mechanism, and electrical control system. The retrieval device is a hook. There are tracks laid on the main beam for the lifting trolley to move horizontally along the direction of the main beam. The main beam is welded to the box end beam, and there are joints arranged in the middle of the end beam, which are connected by bolts or pin shafts for the disassembly and transportation of the bridge. There are three operating modes: ground handle, wireless remote control, and driver's cab.