Gantry crane is a variant of the bridge crane

Electric gantry crane  is a variation of the bridge crane, gantry crane known. Mainly used for outdoor yard, yard goods, bulk cargo loading and unloading operations. Its metal structure shaped like a door frame, carrying the main beam install two feet down, you can walk directly to the track on the ground, both ends of the main beam may have overhanging cantilever. Gantry crane with a high utilization of space, large operating range, wide adaptation, versatility, etc., are widely used in the port yard.

Press the door in the form of the structure, according to the main form of beams, according to the main beam structure, according to use in the form of classification.Simple  single girder gantry crane  structure, easy manufacture and installation, small quality of their main beam much for the partial rail box-shaped frame structure. Compared with the double girder gantry crane, the overall stiffness weaker. Therefore, when the starting weight Q≤50t, when the span S≤35m, can this form. Single girder gantry crane doors leg has L and C forms. L type of manufacture and installation convenience, the force was better, the smaller their own quality, but, lifting goods through space at the relatively small number of legs. C-type legs made of sloped or curved shape, aimed at a greater horizontal space, so that goods pass foot.