Novel main chord structure of cargo boom of cantilever tower crane

Abstract

The invention discloses a novel main chord structure of a cargo boom of a cantilever tower crane. The novel main chord structure comprises upper and lower main chords (12), single connectors (11) and double connectors (13), wherein the main chords (12) are of circular tube structures; the two ends of the main chords (12) are inserted into the tail ends of the single connectors (11) and the double connectors (13) separately; and the two ends of the main chords (12) are fixedly connected with the tail ends of the single connectors (11) and the double connectors (13). The novel main chord structure has the beneficial effects that utilization is convenient and quick during the production process, production cycle is shortened, production cost is reduced, welding difficulty is reduced, technological precision of the structure is improved, and selfweight of the cargo boom is decreased.

Description

technical field [0001] The invention relates to a main chord structure, in particular to a novel boom main chord structure of a boom tower crane. Background technique [0002] The design of the main chord of the jib of the tower crane is related to the jib tooling design, processing cost, material cost, overall safety performance of the tower crane, etc. figure 1 - As shown in 4, in the existing design, the process route of the lower chord of the boom is: wire cutting blanking of forging parts - processing groove-shaped notches on the end face of the lower chord - machining the relevant surface and pin hole of the lower chord joint - lower joint Welding with lower chord main chord—lower chord; jib upper chord process route: flame oxygen cutting and blanking plate blank—processing pin hole and beveling on blank—welding lug plate and upper chord main chord—upper chord. The lower chord joints are connected in the form of pairing of single and double joints. The single and doub...

AI Technical Summary

Problems solved by technology

[0003] It can be seen that the processing cost of the main chord of the jib of the existing jib tower crane is high, and there are defects such as high precision requirements for tooling design, sensitivity to welding deformation, and high skill level requirements for welders. The details are as follows: 1. The lower chord is a safety hazard

It is necessary to make a grooved notch on the main chord of the lower chord, which will cause damage to the main chord to a certain extent. The welds of the main chord and the lower chord joint are all plug welded, which has the disadvantages of large welding volume, difficult forming, and poor forming appearance quality

2. The processing procedure is complex and there are many processed parts

From the blank to the final processing to become the main chord of the lower chord, both the lower chord joint and the main chord need to be processed, and the outer surface and inner surface of the tail part of the lower chord joint need to be machined, and the machining cost is high

[0004] 3. The weight of the lower chord joint is relatively large, and the length of the lower chord is required to be higher

In order to ensure the strength requirements of the lower chord joint, the lower chord joint will be left with a longer section of tail, and the lower chord tail will be processed into a hollow weight reduction treatment, but the wall thickness is still relatively thick, and the self-weight is still relatively large; the lower chord joint is inserted into the main chord , and the lower chord has steps, which will require higher dimensional accuracy for the length of the main chord

[0005] 4. The welding volume of the upper chord joint is large, the deformation is large, and the requirements for the size of the tooling are high

Tooling must be used to ensure the position, size and opening of the upper string lug plate, which requires high tooling and increases the difficulty of tooling design and manufacture.

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