Inter-arm locking device

Abstract

The invention relates to an inter-arm locking device which belongs to the field of hoisting equipment telescopic arms. A two-section arm barrel is inserted into a one-section arm barrel, a three-section arm barrel is inserted into the two-section arm barrel; the one-section arm barrel, the two-section arm barrel and the three-section arm barrel are of square barrel shaped structures; lock block assemblies are fixedly arranged in a through hole processed in the one-section arm barrel and a through hole processed in the two-section arm barrel; each lock block assembly consists of a lock base, ashifting fork pushing rod and a wedge block, wherein the wedge block is arranged in a bottom counter bore of a locking base, a bulge on the top of the wedge block is provided with an inclined surface,the inclined surface is in sliding fit to the inclined surface processed on a rod body of the pushing rod, one end of the shifting fork pushing rod passes through a guide hole of the locking base, and is connected with a shifting fork, a single-lever oil cylinder is mounted on the surface of one-section arm barrel and the surface of the two-section arm barrel, a cylinder rod, equipped with a compression spring, of the single-lever oil cylinder is hinged on the middle part of a pushing plate, and the end part of the pushing plate is hinged with the shifting fork. On any telescopic position, the inter-arm locking device can be automatically locked, and the locked telescopic arm does not shake and retract, hydraulic unlocking is achieved, actions are coordinated, response is quick, and working efficiency is high.

Description

technical field [0001] The invention belongs to the field of telescopic arms of lifting equipment, in particular to a locking device between arms. Background technique [0002] At present, the box-shaped telescopic arms on cranes and construction machinery mainly rely on multiple sets of sliders to eliminate the gaps between the boom tubes. Since the telescopic boom tubes are made of bent and welded steel plates, the gaps between the boom tubes If the size is uneven, the thickness of the slider is mainly adjusted manually. If it is too thick, the friction will be too large, which will affect the expansion and contraction of the telescopic arm. If it is too thin, there will be a gap between the arm tubes, and the stability will be poor when stretching. It is easy to shake and stretch in place. Rely on the balance valve of the hydraulic system to lock, keep extending the working state for a long time, it is easy to produce large settlement, so that the telescopic arm can be re...

AI Technical Summary

Problems solved by technology

[0002] At present, the box-shaped telescopic arms on cranes and construction machinery mainly rely on multiple sets of sliders to eliminate the gaps between the boom tubes. Since the telescopic boom tubes are made of bent and welded steel plates, the gaps between the boom tubes If the size is uneven, the thickness of the slider is mainly adjusted manually. If it is too thick, the friction will be too large, which will affect the expansion and contraction of the telescopic arm. If it is too thin, there will be a gap between the arm tubes, and the stability will be poor when stretching. It is easy to shake and stretch in place. Rely on the balance valve of the hydraulic system to lock, keep extending the working state for a long time, it is easy to produce a large settlement, so that the telescopic arm retracts

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