Casting bridge crane is the main lifting and transportation equipment of the smelting workshop of the steel mill, used for the transfer, pouring and molten iron of liquid metal in the smelting process, mainly composed of bridges, trolleys, hook beams, large vehicle operation and electrical parts, 125t below the use of double beam structure, 125t above the use of four beam structure, the main hook extraction device for fixed spacing hook beam, used to lift the molten iron bale, the secondary hook is used to cooperate with the main hook to dump molten iron and other auxiliary lifting operations. The main vehicle operating mechanism and the main electrical equipment are installed in the main beam, and the main beam electrical room is insulated with rock wool and equipped with a cold air blower. In order to reduce the thermal radiation of molten steel to the metal structural parts, a heat shield is provided at the bottom of the main beam along the span direction. The operation mechanism of the large vehicle adopts the form of four-corner drive. The crane is equipped with a special electronic scale with a clear display device in the driver’s room and on the bridge. The main lifting mechanism is equipped with an over speed switch.