QTZ series tower cranes are designed and manutactured by Jinan Hengsheng Engineering Machinery Co.,Ltd, adpting unitization technology, assembled desigh technology and finite analysis technology .It is the latest lift and transport machinery with the toll of "Tower Crane microcomputer design platform" in China.So QTZ tower crane is more rational in strcuture and more reliable in function. It is equiped with advanced security device and very convenient to operate.