The bridge crane is the lifting equipment for lifting the material over the workshop, the warehouse and the material field. Because its ends are located on tall cement columns or metal supports, they are shaped like bridges. The bridge crane's longitudinal operation along the track laid on both sides of the overhead crane can make full use of the space under the bridge frame to hoist the material, and is not hindered by the ground equipment. It is the most widely used and the largest number of lifting machinery.