Crane structural classification: light small lifting equipment. Features small light lifting equipment is lightweight, compact and large cranes, the operation is simple, the operation range projection point, line oriented. Light small lifting equipment, usually only a lifting mechanism, which only allows for a single heavy lifting movement. Compact electric hoist with a structure, lightweight, safe and reliable, a large degree of common parts 30 t cranes, interchangeability, high lifting capacity, easy maintenance, Zhejiang 30 tons truck crane, is widely used and popular light lifting equipment. Crane structure: crane operating agencies generally only four driving and driven wheels, if great weight 30 tons truck crane company, used to increase the wheel Measures shall be reduced wheel pressure. When the wheels than four, must be balanced hinged frame means that the crane load is evenly distributed on each wheel.