Crane of structure: by lifting the nature points. Mobile cranes, tower cranes, mast crane. According to the structure, the crane can be divided into small light lifting equipment, bridge type (bridge, gantry crane), the arm frame (self-propelled, tower, gantry, rail-style, floating boat-mast cranes), cable type. Crane structural classification: light small lifting equipment. Features small light lifting equipment is lightweight, compact, Zhejiang 20 tons truck crane, action simple buy 20 tons truck crane, the operating range projection point, line oriented. Light small lifting equipment sold 20 tons truck crane, usually only a lifting mechanism, which only allows for a single heavy lifting movement. Electric hoist with a compact, lightweight, safe and reliable, high degree of component commonality, interchangeability, high lifting capacity, easy maintenance, is widely used and popular light lifting equipment.