A gantry crane is a variant of a bridge crane, also called a gantry crane. It is mainly used for the loading and unloading of cargo yards, yard goods, and bulk cargoes in outdoor areas. Its metal structure is like a gantry frame, carrying two feet under the main beam, and can directly walk on the track of the ground. Both ends of the main beam can have an outrigger cantilever beam. The gantry crane has the characteristics of high site utilization, large operating range, wide adaptation, and strong universality. It has been widely used in the port cargo yard.