Mobile crane, is to use Mobile chassis walk arm of the rotating crane. Mobile crane is installed in the lifting institutions add heavy axle tyres and composed of special chassis a kind of full rotary cranes, its upper structure and crawler crane basic same, in order to ensure the installation work time the stability of the body, crane with four retractable a leg. In flat on the ground can need not a leg up on small weight lifting and crane content low speed driving. It consists of getting on and off two parts. Get on the bus for lifting operation part, arm, with lifting me. luffing mechanism, the balance weight and turntable, etc.; Get off for supporting and walk part. On and off the bus with rotary bearing connection between. Hanging heavy usually takes a leg when put down, increase the bearing surface, and will the leveling of the fuselage, to ensure the stability of the crane. Compared with the crane the advantages are: between wider, good stability, automobile body, short turning radius small,can in 360 ° work within. But its down the road to the demand is higher, speed is slow, not suitable for car type on the soft ground in the muddy. The development trend of Mobile crane is: large-scale, high efficiency, safety, ease self-respect, and to further improve the performance and driving mobility lifting. Feature: