Overhead crane is a lifting equipment that lifts materials across the top of workshops, warehouses and stockyards. Because its ends sit on tall cement pillars or metal supports, it is shaped like a bridge. The bridge frame of the overhead crane runs longitudinally along the track laid on the elevated on both sides, which can make full use of the space under the bridge to lift materials without being hindered by ground equipment. It is a kind of lifting machinery with the widest range of use and the largest quantity.