Hole Bottom Closed Sampling Device

Abstract

The invention relates to the field of underground coal seam and layer-penetrating sampling equipment in coal mines, and specifically discloses a closed-type sampling device at the bottom of a hole. It includes a sampling drill bit, a draft tube, a transmission shaft, a transmission gear, a valve, a collector, and a drill pipe connector; Disassemble the connection; the front part of the transmission shaft is provided with a stopper and placed in the guide tube, the middle part is sleeved with elastic parts, and the rear part is provided with transmission teeth to cooperate with the transmission gear; the transmission gear is operated with the valve The part is connected; the drill pipe connector is connected with the drill pipe. The sampling device of the invention can keep the obtained coal samples in their original state, thereby improving the accuracy of test results, and has a simple and reliable structure, small volume, and is convenient for repeated use.

Description

technical field [0001] The invention relates to the field of underground coal seam and layer-penetrating sampling equipment in coal mines, and specifically discloses a closed-type sampling device at the bottom of a hole. Background technique [0002] At present, during the sampling process of the coal seam under the coal mine and drilling through the bed, most of the coal samples obtained are coal powder discharged from the borehole to the orifice. The coal sample is rotated by the drill pipe during the discharge process, and is driven by wind and water in the borehole, which has a serious impact on the properties of the coal sample itself and the gas content. Therefore, there are great differences in the relevant parameters obtained by testing these coal samples. The deviation cannot correctly reflect the properties of the coal seam; and the exposure time of the core bit coal sample is generally long, generally more than 30 minutes, which is much longer than the 5 minutes r...

AI Technical Summary

Problems solved by technology

The coal sample is rotated by the drill pipe during the discharge process, and is driven by wind and water in the borehole, which has a serious impact on the properties of the coal sample itself and the gas content. Therefore, there are great differences in the relevant parameters obtained by testing these coal samples. deviation, which cannot correctly reflect the properties of the coal seam; and the exposure time of the core bit coal sample is generally long, generally more than 30 minutes, far greater than the 5 minutes required by the national standard, and the estimated loss is less than the actual analysis amount

In addition, the frictional heat generated between the sampling drill bit and the coal sample also greatly promotes the gas analysis of the coal sample, which has a considerable impact on the gas content of the test coal seam

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