Vehicle-mounted cranes are usually composed of an automobile chassis, a turntable, a power take-off, a crane, and support legs. Special chassis for cranes can be selected from Dongfeng, Jiefang, Dayun, Shaanxi Automobile, Sinotruk, etc. Common cranes can be divided into XCMG cranes, Sany cranes, Shimeiji cranes, Jincheng Tianma cranes, etc. according to manufacturers. According to the boom type, they can be divided into straight-arm cranes and folding-arm cranes. According to the tonnage, they can be divided into 2 tons, 3.2 tons, 5 tons, 6.3 tons, 8 tons, 10 tons, 12 tons, 16 tons, and 20 tons.