Device for performing rapid positional sampling in underground coal

Abstract

The invention discloses a device for performing rapid positional sampling in underground coal. A long groove is formed in the middle part of a front connecting rod along the circumferential direction; a square groove is formed in a short section of a connecting rod sleeve; a sliding block is arranged in the square groove; one side of the sliding block abuts against the edge of the long groove; the two sides of the sliding block abut against the edge of the square groove; a sampling piece moves forwards to push the sliding block so as to drive a protecting piece to move to a sampling point; and the sampling piece moves backwards until the sliding block falls into the other side of the long groove and abuts against the edge of the other side of the long groove so as to perform sampling to a sampling cavity. Ascending and descending of the device are simple, convenient and rapid, underground auxiliary and power equipment does not need to be changed, and sampling integrity and high purity are achieved.

Description

technical field [0001] The invention relates to a device for sampling in a coal body, in particular to a device for fast sampling at a fixed point in an underground coal body. Background technique [0002] In the process of coalbed methane detection and development, because coal sample analysis is required to measure the gas content in coal seams, it is necessary to obtain measurement samples by drilling coal samples. [0003] Most early sampling methods used the method of collecting cuttings at the opening of the predicted borehole. This method has three major problems: 1. The sample taken is not pure, and the cuttings collected at the opening include the coal wall. The cut coal samples, as well as the coal samples cut off by the drill pipe on the coal body during drilling to the specified position, and the debris cut off on the gangue in the coal, so it cannot be guaranteed that the coal samples taken are fixed-point measurements coal sample. 2. The sampling location is ...

AI Technical Summary

Problems solved by technology

[0003] Most early sampling methods used the method of collecting cuttings at the opening of the predicted borehole. This method has three major problems: 1. The sample taken is not pure, and the cuttings collected at the opening include the coal wall. The cut coal samples, as well as the coal samples cut off by the drill pipe on the coal body during drilling to the specified position, and the debris cut off on the gangue in the coal, so it cannot be guaranteed that the coal samples taken are fixed-point measurements coal sample

2. The sampling position is inaccurate, and the coal sample collected at the hole cannot be determined at which depth the coal sample is from the cuttings

3. The exposure time of the orifice coal sample in the air is longer, which has a greater impact on the accuracy of the gas content measurement results in the later stage

[0004] The recent sampling methods are relatively complex sampling devices, and the samples obtained through the sampling devices are all powdery and small fragments. In these samples, there may be some faults caused by faults, stone packs and other geological structures or coal seams. The debris cut from the drill during the middle gangue cannot guarantee the sample purity of the coal sample

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