Postwelding heat preservation system for main chord pipe

Abstract

The invention discloses a post-welding heat preservation system for a main chord pipe. The post-welding heat preservation system comprises a conveying device and a plurality of pairs of heat preservation bins; each pair of heat preservation bins are evenly arranged on the two sides of the conveying device; the heat preservation bins on the same side are in butt joint in sequence; and when the conveying device conveys the welded main chord pipe to one pair of heat preservation bins, annular weld joints at the two ends of the main chord pipe are located in the heat preservation bins on the corresponding sides, and the temperature in each pair of heat preservation bins is sequentially reduced in the conveying direction of the main chord pipe. The heat preservation system has the advantages that welding stress concentration can be reduced, weld joint cracking can be prevented, the overall strength of the main chord pipe can be improved, and energy conservation and temperature control are facilitated.

Description

technical field [0001] The invention mainly relates to the main chord forming technology, in particular to a post-weld thermal insulation system for the main chord. Background technique [0002] Crane is a kind of construction machinery capable of lifting, transporting and loading and unloading materials. It is widely used in construction, transportation, ports, energy and farmland water conservancy and other fields, such as building bridges, installing power generation equipment, shipbuilding, and erecting wind power. generator set etc. [0003] In recent years, with the development of large-scale engineering projects such as petrochemical, nuclear power and steel, the demand for hoisting of super-large equipment is increasing, which puts forward higher requirements for the lifting height and lifting capacity of the crane. The boom is one of the important structural parts of the crane, and the performance of the boom has an important influence on the lifting height and lif...

AI Technical Summary

Problems solved by technology

[0004] The jib frame is spliced ​​by the main chord. The main chord mainly includes steel pipes. The ends of the steel pipes are connected with joints, and ear hinges are welded on the joints. Girth welding is used in the upper part, and the welding stress concentration and weld cracking are easy to occur after the girth weld is welded at the joints at both ends of the pipe parts, which has a great impact on the performance of the boom

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