Gantry crane is a deformation of bridge crane and gantry crane. Mainly used in outdoor yards, yard goods, bulk cargo loading and unloading operations. Its metal structure shaped like a door frame, bearing girders installed two feet, walking on the tracks directly in the ground, both ends of the main beam with overhanging cantilevers. Gantry crane with site operations and high efficiency, wide, wide adaptability, versatility and other features in the port yard, are widely used.