Method for manufacturing and controlling camber of crane main girder

Abstract

The invention relates to a method for manufacturing and controlling the camber of a crane main girder, and belongs to the technical field of crane structure manufacturing. The method comprises the steps that a web plate is welded to a connecting plate according to the longitudinal length and is cut and formed according to the reserved camber, all longitudinal long ribs on the web plate and the web plate are assembled and welded in place, an upper jig frame and a base plate are assembled after shaping and flattening are carried out, an inner transverse partition plate and the web plate are welded, longitudinal welding joints of the web plate and the base plate are formed, welding should be completed from the middle to the two sides gradually so as to control welding deformation, and the two sides of the girder are symmetrically welded to form the U-shaped girder. The method has the advantages that excessive materials and defective materials are used for manufacturing so that resources can be recycled and the cost can be saved; due to the rigid connection of the structure and the jig frame and the reserved camber value of the jig frame, the structural forming precision is completely controlled, secondary damage of flame distortion rectification to materials is avoided, and the welding sequence is reasonable.

Description

technical field [0001] A method for manufacturing and controlling the camber of a main girder of a crane belongs to the technical field of crane structure manufacturing. Background technique [0002] At present, the traditional method of domestic crane construction, especially the main girder construction, is to build the main girder of the crane with the casting platform as the horizontal reference, and control the camber of the main girder by adding adjustment pads in the middle of the girder and pyrotechnic orthopedics. The disadvantage of the traditional method is that the casting platform has a large demand and the transfer is complicated. The adjustment block cannot control the deformation of the structure, which affects the overall dimensional accuracy of the structure, and the pyrotechnic orthopedic affects the performance of the material. Contents of the invention [0003] In view of the defects existing in the prior art, the object of the present invent...

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Problems solved by technology

[0002] At present, the traditional method of domestic crane construction, especially the main girder construction, is to build the main girder of the crane with the casting platform as the horizontal reference, and control the camber of the main girder by adding adjustment pads in the middle of the girder and pyrotechnic orthopedics. The disadvantage of the traditional method is that the casting platform has a large demand and the transfer is complicated. The adjustment block cannot control the deformation of the structure, which affects the overall dimensional accuracy of the structure, and the pyrotechnic orthopedic affects the performance of the material.

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