The overhead crane is a kind of bridge type crane that runs on an elevated track, also known as a crane of the overhead. The bridge frame of the overhead crane runs longitudinally along the track laid on the elevated on both sides, and the crane trolley runs transversely along the track laid on the bridge frame, forming a rectangular working range, and the space under the bridge can be fully utilized to lift materials, and it is not hindered by ground equipment. This kind of crane is widely used in indoor and outdoor warehouses, workshops, docks and open-air storage yards.