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1.Double girder gantry crane is applied open warehouse or rail along for general handling and lifting work, it also can equipped with many lifting device for special work. 
2.This kind of crane is composed of bridge, support legs, crane traveling organ, trolley, electric equipment, strong lifting winch, the frame adopts box-type welding mechanism, crane traveling mechanisms are operated in the driver cabin or remote control. 
Power is supplied by cable or slide wire, there are different capacity double beams gantry crane for your choice according to your different use. 
3.Double girder gantry crane have A type,U type.U type is designed for container lifting.It could be designed with cantilever or not.The crane working class is A5.       
4.There are two type structure for the main girder and leg as optional: truss girder type and box girder type. 
5.It is prohibited for lifting melt metal , flammable, explosive, corrosion, overloading, dust and other dangerous operations.