Gantry crane having main beam with suspension cable type structure

Abstract

The invention discloses a gantry crane having a main beam with a suspension cable type structure; the gantry crane comprises a hoisting trolley, a hoisting trolley traveling mechanism, a gantry crane traveling mechanism, a control system, supporting legs and the main beam; the main beam has the suspension cable structure; the suspension cable structure comprises a box-shaped beam, a suspension cable and slings; the suspension cable is located above the box-shaped beam, and two ends of the suspension cable are fixedly connected with two ends of the box-shaped beam respectively; the slings are vertically mounted between the suspension cable and the box-shaped beam, the lower end of each sling is provided with a pretightening nut; the pretightening nuts produce a pretightening force through tightening, the pretightening force generates cable tension in the suspension cable, and the box-shaped beam generates an upward deflection under the action of the suspension cable and the slings when the crane is no-load. A reverse bending moment is generated in the box-shaped beam, so that the whole load carrying and mechanical balance has qualitative change, the bearing capacity is greatly increased, at the same time, the weight of the main beam is greatly reduced, the raw material and manufacturing costs are saved, and the installation cost is also reduced.

Description

technical field [0001] The invention relates to a crane, in particular to a main girder gantry crane with a suspension cable structure suitable for general occasions and fields such as wharf and bridge construction. Background technique [0002] Gantry cranes can be divided into single-girder gantry cranes and double-girder gantry cranes according to the structure of the gantry frame. The structure of the main beam can be divided into various types such as single box main beam and double box main beam. The box girder structure crane structure is the most commonly used beam structure type in cranes at home and abroad. Because the box beam structure has the advantages of simple design and good manufacturing process, it is still a typical structure that is mass-produced and most commonly used in my country. The box girder metal structure is the skeleton of the crane. The main load-carrying parts such as bridges, jibs and portals can be box-shaped structures or truss struc...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a main girder gantry crane with a suspension cable structure, so as to solve the problems of existing gantry cranes such as heavy self-weight, large deflection of the main girder when carrying loads, large shear stress, and overall bending resistance of the main girder. Technical problem with low torsional strength

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