Metal structure box double girder gantry cranes like the gate-shaped frame, carrying the main girder installation of four legs, can walk directly on the ground track, both ends of the main beam has extended cantilever. By a bridge, traveling mechanism, trolley, electrical equipment components. All bodies were manipulated in the control room.
Box double girder gantry cranes are mainly suitable for handling and lifting the large item handling operations. Box double girder gantry crane with a space utilization is high, a large operating range, wide adaptation, versatility, etc., it is widely used in the port yard.