Single-girder overhead traveling crane is a lifting equipment which is used for lifting materials across the workshop, warehouse and yard. Because it is located on both ends of a tall cement column or metal stent, shaped like a bridge. The single-girder overhead traveling crane's bridge runs longitudinally along the tracks laid on both sides of the overhead crane, which can take full advantage of the space under the bridge to lift the materials without being hindered by the surface equipment. It is the most widely used, the largest number of lifting machinery. Single-girder bridge crane is an important tool and equipment to realize the mechanization and automation of the production process in modern industrial production and lifting transportation. Therefore, single-girder overhead traveling cranes have been widely used in indoor and outdoor industrial and mining enterprises, steel chemical industry, railway traffic, port terminals and logistics turnover departments and places.