Crane of structure: by lifting the nature points. Mobile cranes, tower cranes, mast crane. According to the structure in the form of Guangdong 20 tons truck crane, cranes are mainly divided into small light lifting equipment, bridge type (bridge, gantry crane), the arm frame (self-propelled, tower, gantry, rail-style, floating boat type, Mast Cranes), the cable type. Crane Note: Each crane nominal weight must hang signs in conspicuous places. Work, was not allowed to transport people or hook on the bridge. No operating permits and drink are not allowed to drive a crane. Operation must concentrate, not allowed to talk, smoke or do has nothing to do. To clean the car; allowed misplacing equipment, tools, flammable and explosive materials and hazardous materials.