Counter-rotating sealing coal sample sampler and application method thereof

Abstract

The invention relates to a counter-rotating sealing coal sample sampler and an application method thereof; the sampler of the invention comprises a combined drill, a coal sample cylinder, a sealing disc assembly, a sealing shaft assembly, a hole-sealing drive-plate assembly and a diameter-variable joint; The combined drill is connected with the upper end of the coal sample cylinder; a pressure plate of the sealing disc assembly presses a sealing disc on a concave plateform of the coal sample cylinder; a coal inlet is disposed on the sealing disc; a sealing sleeve of the sealing shaft assemblyis connected inside a through hole of the coal sample cylinder; a drive plate of the hole-sealing drive-plate assembly drives the coal sample cylinder to rotate by cooperating with a drive block at the bottom of the coal sample cylinder; a arc-shaped key groove drives the sealing shaft assembly to rotate by cooperating with a drive block on the sealing sleeve; the whole sampler is connected to a drilling rod by the diameter-variable joint; when the drilling machine performs counter-rotation, a sealing head enters the coal inlet of the sealing disc to complete coal sample sealing; gas in the coal sample enters a gas desorption device through a rapidly-connected device at the end of the sealing shaft assembly, and an underground on-site gas desorption test is performed. The sampler of the invention is widely applicable to determination and detection of coal mine coal seam gas content.

Description

technical field [0001] The invention relates to a coal sampler and its use method, in particular to a reverse-sealed coal sampler for measuring the gas content of coal seams and its use method. Background technique [0002] Coal seam gas content is one of the important parameters reflecting the occurrence of coal seam gas, and it is an important basis for calculating coal seam gas reserves, predicting mine gas emission, designing gas drainage and evaluating the risk of coal and gas outburst in coal seams. The accuracy of gas content measurement not only restricts the reliability of mine gas hazard prediction, but also affects the effectiveness and economy of gas control measures based on gas hazard prediction, and even endangers mine safety production. At present, the coal seam gas content determination methods mainly include indirect method and direct method. The indirect method uses the Langmuir formula to calculate the coal seam gas content according to the measured coal...

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Problems solved by technology

The desorption speed of coal cuttings is very fast at the initial stage of separation from the coal body. If the lump coal sample can be taken out, the gas loss during the sampling process will be greatly reduced. lumpy coal sample

In addition, although many devices for directly sampling and measuring gas content have been developed at home and abroad, such as ordinary single-layer sampling pipes and double-layer sampling pipes, there is no major breakthrough in the sampling methods and principles, and the gas loss during the sampling process is serious, resulting in There are large errors in the measured coal seam gas content measurement results, which is not conducive to the formulation and effective implementation of gas control measures

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