Pressure balance bar type tri-telescopic stand column for hydraulic support

Abstract

The invention discloses a pressure balance bar type tri-telescopic stand column for a hydraulic support. The pressure balance bar type tri-telescopic stand column comprises a stand column large cylinder, a first-stage mediate cylinder and a second-stage mediate cylinder. A third-stage mediate cylinder is arranged in the second-stage mediate cylinder, the outer end of the third-stage mediate cylinder is connected with a column head of the stand column, and a pressure balance bar is arranged in the third-stage mediate cylinder. A piston and a guide sleeve are arranged between the pressure balance bar and the third-stage mediate cylinder. The cross section area of the piston is larger than that of the pressure balance bar. A floating structure or a fixed connecting structure is adopted between the pressure balance bar and the second-stage mediate cylinder. The pressure balance bar is mainly used for increasing the effective supporting area of the third-stage mediate cylinder so as to improve the bending resistant and deformation resistant capabilities of the third-stage mediate cylinder, the magnification ratio of the stand column is high, the automation degree is high and the safety property is good.

Description

technical field [0001] The invention relates to a hydraulic support column, in particular to a pressure balance bar type three-telescopic column for a hydraulic support. Background technique [0002] With the development of the coal industry, resources are gradually scarce, and gradually focus on mining some coal seams with large changes in coal seam thickness and difficult mining, which puts forward higher requirements for supporting equipment hydraulic supports. The column, as the core component of the hydraulic support, is also constantly being updated. [0003] At present, the relatively mature columns mainly include single-telescopic ordinary columns, single-telescopic mechanical extension column, ordinary double-telescopic columns and ordinary three-telescopic columns, among which single-telescopic ordinary columns, single-telescopic mechanical extension columns and ordinary double-telescopic columns are telescopic Relatively small, for super-large cross-border mining...

AI Technical Summary

Problems solved by technology

[0003] At present, the relatively mature columns mainly include single-telescopic ordinary columns, single-telescopic mechanical extension column, ordinary double-telescopic columns and ordinary three-telescopic columns, among which single-telescopic ordinary columns, single-telescopic mechanical extension columns and ordinary double-telescopic columns are telescopic Relatively small, for super-large cross-border mining support, its expansion and contraction ratio is far from meeting the requirements of use

[0004] like figure 1 As shown, although the ordinary three-telescopic column has a high degree of automation and a large expansion ratio, in use, the pressure in the secondary cylinder is relatively high, and the safety performance of the secondary cylinder is poor, which may easily cause the expansion of the cylinder.

Images