A bridge crane running on elevated tracks is also called overhead travelling crane. The bridge frame of the bridge crane runs along the orbits on both sides of the overhead frame, and the hoisting trolley runs along the track on the bridge and forms a rectangular working range. It can make full use of the space under the bridge frame to lift the material and not be hindered by the ground equipment. This crane is widely used in indoor and outdoor warehouses, factories, wharfs and open storage.