Hydraulic support double-telescopic upright post

Abstract

The invention discloses a hydraulic support double-telescopic upright post, comprising an outer cylinder body, a middle cylinder body arranged in the outer cylinder body and a movable cylinder body arranged in the middle cylinder body. The middle cylinder body and the outer cylinder body are respectively formed by welding the cylinder with the cylinder bottom provided with a joint check mouth, and a ring groove is cut inside the joint check mouth at the bottom of the middle cylinder body or/and the outer cylinder body. The upright post is just characterized by the ring groove cut inside the joint check mouth at the bottom of the middle cylinder body or/and the outer cylinder body. Therefore, according to mechanical principle, when high concentrated stress is formed, the inside thin wall structure of the check mouth easily deforms due to the presence of the ring groove, and the deformation does not affect the overall structural performance of the upright post due to the presence of a size gap. In the deformation process, the local high stress is released, thus abating the impact stress of narrow gaps at the cylinder and the joint check mouth of the cylinder bottom, optimizing the overall structural performance of the cylinder body and effectively prolonging the service life of the telescopic upright post.

Description

technical field [0001] The invention relates to a hydraulic support, in particular to a double telescopic column of the hydraulic support. Background technique [0002] Hydraulic support is the necessary supporting equipment for underground work. With the continuous improvement of the level of underground mechanized mining, the requirements for the rated working resistance of the hydraulic support are getting higher and higher. Therefore, the cylinder diameter of the supporting column of the hydraulic support is required to be large, and the working resistance must be large; but since the cylinder body is the most stressed part of the supporting column, especially the double telescopic column, the cylinder barrel and the bottom of the cylinder are connected by welding. This makes the weld prone to breakage under the action of high-pressure impact loads, causing the bottom of the cylinder to fall off. The important reason for this phenomenon is that the local crack propagat...

AI Technical Summary

Problems solved by technology

Therefore, the cylinder diameter of the supporting column of the hydraulic support is required to be large, and the working resistance is large; but since the cylinder body is the most stressed component of the supporting column, especially the double telescopic column, the cylinder barrel and the cylinder bottom of the cylinder are connected by welding. This makes the welds prone to breakage under the action of high-pressure impact loads, causing the bottom of the cylinder to fall off.

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