A three-telescopic column with two-stage support function

Abstract

The invention discloses a three-telescopic column with two-stage support function, which mainly includes four parts: an outer cylinder, a first-level middle cylinder, a second-level middle cylinder and a movable column; the first-level middle cylinder and the second-level middle cylinder have large telescopic support force, The telescopic support force of the living column is small; the bottom valve is designed at the bottom of the first-stage middle cylinder to control the liquid in and out of the lower cavity of the first-stage middle cylinder, ensuring the same telescopic support force of the first-level middle cylinder and the second-level middle cylinder; no hole is left at the bottom of the second-level middle cylinder, There is a slender hole for the liquid in the lower cavity of the second-level middle cylinder on the live column, and the liquid inlet is at the head of the live column; the telescopic support force of the first-level middle cylinder and the second-level middle cylinder of the column is 2 to 4 times that of the live column. The three telescopic column with two-stage support function of the present invention is suitable for long-distance advanced support brackets. The small initial support force and small working resistance can reduce repeated support for the roadway, and the large initial support force and large working resistance can cause severe pressure and deformation. Serious roadways provide strong support to effectively control the deformation of the roadway.

Description

technical field [0001] The invention relates to a three-telescopic column with two-stage support functions, in particular to a three-telescopic column for a hydraulic support, and belongs to the technical field of coal mining support. Background technique [0002] At present, the telescopic forms of columns used in hydraulic supports mainly include three types of structures: single telescopic, double telescopic and triple telescopic. The telescopic form of the column is selected according to the expansion ratio of the hydraulic support. Force and working resistance, and the more expansion stages of the column, the greater the pressure of the cylinder in the column, and the worse the safety, so three telescopic columns are rarely used in the design of hydraulic supports. [0003] With the development of mining technology, more and more domestic mining areas with high roadway pressure and large deformation have begun to use large working resistance hydraulic supports for roadw...

AI Technical Summary

Problems solved by technology

[0002] At present, the telescopic forms of columns used in hydraulic supports mainly include three types of structures: single telescopic, double telescopic and triple telescopic. The telescopic form of the column is selected according to the expansion ratio of the hydraulic support. Force and working resistance, and the more the expansion series of the column, the greater the pressure of the cylinder in the column, and the worse the safety, so three telescopic columns are rarely used in the design of hydraulic supports

[0003] With the development of mining technology, more and more domestic mining areas with high roadway pressure and large deformation have begun to use large working resistance hydraulic supports for roadway advance support, which solves the problem of high labor intensity, support and return of single pillars to a certain extent. The problems of slow withdrawal speed and low production efficiency, but the repeated support of the lifting and moving of the support with large working resistance will damage the roadway roof and the roadway anchor net system, and the roadway roof is easy to fall in advance, which increases the difficulty of roadway maintenance

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