Novel coal sample collecting device

Abstract

The invention discloses a novel coal sample collecting device which comprises an outer protection drill stem, an inner sampling drill stem and a wind path steering mechanism. The outer protection drill stem, the inner sampling drill stem and the wind path steering mechanism are connected through a drill stem connection mechanism. The coal sample collecting device has a simple structure and is convenient to operate, and has feeding and sampling work states in use; airstream passes through both an outer protection drill pipe and a sampling drill pipe in the feeding process, so that cooling of a blade and cleaning of the sampling drill pipe can be guaranteed; the sampling drill pipe firstly contacts the coal wall when being fed to a sampling point; the sampling drill pipe moves backwards to move compressed airstream to reverse a pressure spring under the action of feeding force; the wind path steering mechanism acts, and the airstream path changes and comes into the sampling work state. In the sampling process, the airstream passes through the outer protection drill pipe, and no airstream passes through the sampling drill pipe so as to guarantee cooling of the blade and normally sampling of the sampling drill pipe. Smooth implementation of the coal sample collecting work can be guaranteed, the coal sample collecting efficiency is high, and the coal sample accords with the measuring standards.

Description

technical field [0001] The invention belongs to the technical field of underground coal sample collection equipment in coal mines, and in particular relates to a novel coal sample collection device. Background technique [0002] The coal sample collection device is used in the drilling process of gas drainage holes in coal mines to collect coal samples at the sampling points, and to measure the gas content through experiments on the collected coal samples, so as to determine the gas content of the coal seams at the sampling points. To master, to provide reference data to ensure the safety of personnel and equipment during the drilling process. [0003] At present, there are two types of coal sample collection devices: negative pressure powder discharge type and sampling tube direct collection type. [0004] The negative pressure powder discharge type is to extract the coal powder cut by the drill bit through the negative pressure formed by the external fan on the inner cavi...

AI Technical Summary

Problems solved by technology

However, according to practice, it is found that the gas content data measured by the coal sample obtained by this method is inaccurate and has a large error, and cannot truly represent the gas content of the coal seam at the sampling point. The inner cavity cannot be ventilated, and the sampling tool cannot be cooled, so the heat generated during cutting cannot be discharged in time, causing the coal sample to sinter, lose its original properties, and lose the meaning of measurement

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