Crane of structure: by driving points. One for the central drive 25 tons truck crane company, which uses an electric motor to drive the long drive shaft on both sides of Active Wheel; the other for each drive that active on both sides of each wheel with a motor drive. Medium and small more using a combination of overhead crane brakes, gear units and motors into one of the "triple play" drive mode Guangdong 25 tons truck crane, from the weight of an ordinary large overhead crane for ease of installation and adjustment, the driving device often used universal coupling. Crane of structure: bridge cranes. In rectangular space and over the job, and more for workshops, warehouses, open yard loading and unloading goods, etc., have girder cranes, bridge cranes, Cranes bridge, carrying bridges. Girder cranes: Beam cranes including single girder crane and double girder bridge crane.