Production technology of box girder of crane

Abstract

The invention discloses a production technology of a box girder of a crane. The production technology is characterized by comprising the following steps of (1) delivering raw material into a warehouse for standby; (2) scribing; (3) blanking; (4) cleaning and correcting; (5) butt welding; (6) assembling and welding separating plates; (7) assembling and welding a lower cover plate; (8) correcting and checking. By adopting the scheme, the production technology has the advantages that the technology is simple and reasonable; the rigidity of the girder is greatly improved; the submerged arc automatic welding technology is adopted for welding, so the welding deformation is small, the strength of welding seams is high, the residual stress is small, the bearing capability is improved, the service life of the girder is prolonged, the manufacturing cost is reduced, and the economic benefits of enterprises are increased.

Description

field of invention [0001] The invention relates to the field of crane manufacturing, in particular to a production process of a box-shaped main girder of a crane. Background technique [0002] As the main mechanical equipment for material lifting, transportation, loading and unloading or installation, cranes have been widely used in the development of my country's national economy. Strengthening the research and improvement of cranes is very important for improving the level of material lifting, transportation, loading and unloading or installation in our country. Significance. At present, the cranes widely used in machinery, metallurgy, transportation, electric power, coal, construction and other industries in China are mainly bridge cranes. The bridge frame of bridge cranes is the main load-bearing component, which mainly bears the weight of itself and the weight of lifting heavy objects. The box girder is one of the basic forms of the metal bridge frame of the bridge cran...

AI Technical Summary

Problems solved by technology

The box girder is one of the basic forms of the metal bridge frame of the bridge crane. At present, the flat web box girder is commonly used. In the prior art, the flat web is welded with stiffeners to avoid local instability, but the welding residual At the same time, the stress also leads to the weak bending, shearing and local compressive capacity of the flat web girder; and the existing flat web has a long manufacturing cycle, consumes a lot of materials, and has high production costs, which can no longer meet the growing needs of development.