Gantry crane is a kind of overhead crane whose horizontal bridge is set on two legs, constructed a “door frame” shape. Gantry crane runs on the ground track, is widely used in various industries, such as ground combination of power field equipment, equipment production and processing, precast of the cement frame, lifting of the object, handling train and car in the railway freight yard, lifting ship in the shipyard, lifting lock gate in the dam of hydropower station, loading and unloading containers at port terminals, lifting and carrying heavy goods inside the factory, Construction work in the construction and installation site, Accumulation of wood in the lumber storage yard. The use of gantry crane greatly reduces the labor intensity of the stevedore, improve the operating conditions of workers, Improve the production capacity and labor productivity of loading and unloading operations, gantry crane is the key lifting equipment to ensure construction quality and efficiency.