Gas sample collecting device applied to underground coal mine

Abstract

The invention discloses a gas sample collecting device applied to an underground coal mine. The gas sample collecting device comprises a vertical push-pull cylinder, annular airtight passages penetrating through the upper end and the lower end of a cylinder block (3), a gas inlet pipe (11) connected to the front end of the corresponding annular airtight passage, an exhaust pipe (12) connected to the rear end of the corresponding annular airtight passage and a sampling bag (C) connected to the tail end of the exhaust pipe. The inside of the cylinder block communicates with the inside of the annular airtight passages. The annular airtight passages are located at the position on both sides of the gas inlet pipe and the position on both sides of the exhaust pipe and are separately provided with one-way check valves (8). When reciprocating push-pull movement is performed in the cylinder to form negative pressure, gas flows in the direction from the gas inlet pipe to the exhaust pipe. The gas sample collecting device can realize the gas sample collecting operation and the beam tube long-distance sampling operation under a high negative pressure condition; and the reciprocating continuousgas sample collecting operation can be quickly performed, the sampling amount is large, and the workload is reduced and the sampling time is shortened in the sampling process.

Description

technical field [0001] The invention relates to the technical field of underground coal mines, in particular to a gas sample collection device used in underground coal mines. Background technique [0002] During the circulation collection cycle of closed gas samples in coal mines, with the continuous advancement of the mining face, the closed inspection route is continuously extended, and the number of closed is increasing, which greatly increases the workload of closed inspection. The continuous advancement of the mining face destroys the balance state of the original rock mass stress. During the redistribution of rock mass stress, the mine pressure appears frequently, resulting in severe coal pillar breakage. The roadway adjacent to the goaf is within the mine pressure display range. The gas composition in the airtight chamber is an important basis for judging whether the goaf is on fire and whether there is a hidden danger of spontaneous combustion. [0003] The gas coll...

AI Technical Summary

Problems solved by technology

In order to solve the technical problems of small gas sample collection volume and long airtight sampling time of small-volume manual air pumping device, improve the efficiency of airtight inspection, and make the airtight inspection work more compact

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