Hydraulic cutting device and gas extraction pipe cutting method

Abstract

The invention discloses a hydraulic cutting device and a gas extraction pipe cutting method. The hydraulic cutting device comprises a high-pressure water pump, a drill rod used for being inserted into a gas extraction pipe, a hydraulic cutting head detachably connected with the head of the drill rod and a supporting base used for supporting the tail of the drill rod. The hydraulic cutting head comprises a cutting head shell, a nozzle and a rolling bearing used for being supported between the cutting head shell and the gas extraction pipe. According to the hydraulic cutting device and the gas extraction pipe cutting method, the hydraulic cutting head can be driven by the drill rod to rotate in the gas extraction pipe, high-pressure water is supplied to the hydraulic cutting head through the high-pressure water pump, the high-pressure water is sprayed out from the nozzle of the hydraulic cutting head, and therefore the annular pipe wall of the gas extraction pipe can be annularly cut; the device is simple, convenient and fast to operate, effectively realizes the cutting work of the gas extraction pipe in the coal seam, and is convenient for the heading machine to dig out the second crossheading (small coal pillar crossheading) of the coal pillar.

Description

technical field [0001] The invention relates to the technical field of coal mine construction, in particular to a hydraulic cutting device and a gas drainage pipe cutting method. Background technique [0002] In the process of mining coal in mines, there are often "three soft" types of coal seams, which have poor air permeability, and during mining, thick coal zones are often encountered. In the gob area at the top of the upper corner of the working face, there will be a high concentration of gas, and the phenomenon of gas exceeding the limit often occurs during the mining process. [0003] In the prior art, the general measure is to dig another extraction roadway (the first channel along the coal pillar) on the adjacent side, which is about 25m away from the return air channel of the working face. The width of the coal pillar between the first chute of the coal pillar and the chute of the return air of the working face is wider, which is called a large coal pillar. [000...

AI Technical Summary

Problems solved by technology

[0008] However, when excavating the second channel of the coal pillar, the gas drainage pipe in the area to be excavated will affect the tunneling operation of the roadheader

However, the existing cutting device cannot cut the gas drainage pipe in the coal seam, which brings certain troubles to the coal mining work.

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