Single girder gantry crane is a kind of track traveling mid-light type crane, used together with CD, MD, HC model electrical hoist, according to the shape. The single girder gantry crane consists of four main parts, namely, the bridge structure, the traveling mechanism, the trolley, and the electric equipment. Its proper lifting weight is 5 to 32 tons, proper span is 12 to 40 meters and the working temperature is -20℃ to + 40℃.