Underground pressure wind spot sampling device and process

Abstract

The invention relates to an underground pressure wind spot sampling device. According to the underground pressure wind spot sampling device, a sample collection device is connected with a water converter with a pressure wind connector through a pipe, a double-wall drill pipe connected with the water converter is connected with a drilling machine, and the double-wall drill pipe is connected with a drilling bit. The underground pressure wind spot sampling device is characterized in that wind outlet inclined holes are formed in the outer wall of the drilling bit, and a wind inlet is formed in the top end of the drilling bit. The invention further discloses an underground pressure wind spot sampling process of the underground pressure wind spot sampling device. According to the underground pressure wind spot sampling device and process, positive-pressure sampling is realized, the drilling bit is provided with an injection pipe with injection inclined holes, and therefore negative-pressure smashed coal sampling is realized; besides, the structure is simple, spot sampling can be realized, the drilling bit does not need to be replaced, sampling is fast, and the quality of samples is high; according to the underground pressure wind spot sampling process, by the adoption of positive-pressure sampling, the influence of wind flow on the resolving speed of the coal samples can be reduced, as a result, coal powder below cuttings at the front end of the drilling bit can continuously and quickly enter the sample collection device through the center of the drill pipe, the sampling success rate is increased, and the determination result is more close to the actuality when the obtained coal samples are used for conducting gas content determination.

Description

technical field [0001] The invention relates to an underground compressed air sampling technology and a device, in particular to an underground coal mine compressed air sampling device and a sampling process. Background technique [0002] The determination of gas content is an essential raw data for gas emission prediction, gas control and gas drainage design. More than 70% of the mines in our country are high-gas mines, and the gas disaster restricts the safe mining of coal mines. Therefore, how to improve the sampling and measurement methods of the basic data of gas content has become a problem to be solved urgently. [0003] Researchers at home and abroad have conducted extensive and in-depth research on this issue. The current sampling methods include: negative pressure injection to take coal samples, twist drill pipe, core tube sampling, etc. Negative pressure injection makes the coal sample under negative pressure, which affects the desorption speed of the coal sample...

AI Technical Summary

Problems solved by technology

Negative pressure injection makes the coal sample under negative pressure, which affects the desorption speed of the coal sample and destroys the desorption law of the coal sample, and the success rate of sampling is low due to the influence of the negative pressure; The coal sample is taken from the outer wall of the twist drill pipe. The coal sample flows from the inside to the outside and runs through the entire borehole. Affected by the disturbance of the twist drill pipe, the coal powder on the borehole wall may also be ground down. Therefore, the detailed sampling location of the coal sample It is unclear, which affects the sampling effect, and the twist drill pipe is affected by the ability of the drilling rig, and the sampling depth is shallow; the sampling drill bit must be replaced during the core pipe sampling drilling process, the procedure is more complicated, the sampling time is longer, and the desorption amount of the coal sample taken out Small, the measured gas content of the coal sample is small

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