QD-type crane bridge crane is the use of international advanced standards of manufacturing products. The whole structure is novel, handsome in appearance, good craftsmanship, flexible operation, safe and reliable. main feature: (1) bridge with box-shaped main beam, automatic submerged arc welding. (2) trolley conductive I-beam rail cable conductive new device, safe and reliable. (3) The lifting mechanism may also be provided with a second set of safety devices. Increase