YZ casting bridge crane, of a double-girder single-crab structure,is mainly composed of bridge, crab, connecting traverse, trolley travelling mechanism and electric part, The main hook employs the constant-spacing connecting traverse as the load handling device to hoist steel ladle and the auxiliary hook acts in concert with the main hook to accomplish pouring of molten steel and steel slag, and other auxiliary hoisting.The trolley travelling mechanism and main electric equipment are installed in the girder. The girder’s electric panel room employsrock wool for  heat insulation, and has an air cooler inside. To reduce heat radiation of molten steel to metal structural members,
a thermal baffle is set along the span direction at the bottom of the girder,The troiley travelling mechanism adopts four-corner drive,The crane is equipped with a special electronic scale, and there are display devices in the cab and on the bridge, The main hoisting mechanism is furnished with an overspeed switch,