Method for preventing hitch of hydraulic support from being filled by crushed gangue

Abstract

The invention discloses a method for preventing hydraulic support column sockets from being filled with coal gangue gravel. The method is as follows: the modified polyurethane material is constructed on-site, and directly injected into the column sockets of hydraulic support through high pressure, and then foamed and formed It is a filler with a certain tensile strength and elongation, so as to seal the column socket. In the present invention, the modified polyurethane material is directly injected under high pressure on site, so that the surface of the foam filler is a whole without joints, and it has proper elasticity, which can not only prevent coal dust, coal gangue gravel, etc. from falling into the column nest, Moreover, it does not hinder the movement of the bracket in the column socket. In addition, the invention not only has high construction efficiency and is easy to meet the quality requirements, but also has a self-removal device, which greatly shortens the time for underground emergency repair and replacement of columns.

Description

technical field [0001] The invention relates to a sealing method for a column socket of an underground hydraulic support in a coal mine. Background technique [0002] Such as figure 1 As shown, the hydraulic support is a support mechanism used in coal mines. The hydraulic support column 1 is installed in the column socket 3 of the base 4 through the pin shaft 2 . The column socket 3 of the bracket is an open design. The internal size of the column socket is relatively complicated. At the same time, a large amount of coal dust and coal chips often fall into the well when working underground, and then it is compacted by the moving column 1. After a long time, it is compacted. Coal chips and the like become very hard, seriously affecting the movement of the column 1, causing obstacles to the lifting frame, and in severe cases, the column cannot move normally. Especially when maintaining and replacing the column 1 in addition, the compacted coal dust and coal chips in the col...

AI Technical Summary

Problems solved by technology

The column socket 3 of the bracket is an open design. The internal size of the column socket is relatively complicated. At the same time, a large amount of coal dust and coal chips often fall into the well when working underground, and then it is compacted by the moving column 1. After a long time, it is compacted. Coal chips etc. become very hard, seriously affecting the movement of the column 1, causing obstacles to the lifting frame, and in severe cases, the column cannot move normally

In addition, especially when maintaining and replacing the column 1, the compacted coal dust and coal chips in the column socket 3 are very difficult to handle, which seriously affects the maintenance time

There is currently no good solution to this problem

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