Coal firmness coefficient rapid determination method and portable measuring equipment
A technology for rapid measurement of firmness coefficient, applied in the direction of applying stable tension/pressure to test material strength, sampling device, fuel oil test, etc., can solve problems such as troublesome operation, not suitable for direct measurement in the well, long measurement time, etc. Achieve the effect of simple operation
Inactive Publication Date: 2008-08-06
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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Problems solved by technology
However, the operation of the "drop hammer method" is cumbersome, and it is basically measured in the laboratory, which is not suitable for direct measurement in the mine, and the measurement time is long, which cannot meet the requirements of rapid prediction of outburst risks in the working face
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[0030] see figure 1, the test environment, coal density, coal sample particle size, coal sample cylinder diameter and loading speed are basically the same, and the compression deformation of the coal sample ΔL(L 1 -L 2 ) and the relationship curve between loading pressure (P) and coal firmness coefficient (f). When the process and value of adding force are fixed, f and ΔL can form a functional relationship.
[0031] see figure 2 , through a large number of experiments, apply the data fitting method to obtain the value of f according to the relationship between the numerical change function of P and ΔL. In the test, at the same time, the existing "drop weight method" was used to measure the solidity coefficient f value of coal, and this was used as a standard for comparative analysis, and the function relationship curve between the compression amount and the solidity coefficient f of coal was established.
[0032] Referring to Fig. 3, put the oil pressure piston 7 into the ...
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Abstract
The invention relates to a quick determination method for the firmness coefficient of coal, which has the following steps of taking a coal sample, that is to take phi 1-3mm coal dust with a nest of screens; preparing a determination device, that is to vertically place a portable coal firmness coefficient quick determination device; charging the coal sample, that is to charge the phi 1-3mm coal sample into the determination device; compressing the coal sample, that is to turn a boosting knob to apply pressure and respectively record the travel of a scale pointer when the pointer of a pressure gauge stably reaches the pressure; computing the amount of compression, that is to compute the coal firmness coefficient of the coal body. The invention also relates to the portable coal firmness coefficient quick determination device, which comprises a coal sample barrel. The portable coal firmness coefficient quick determination device is characterized in that: the cavity of the coal sample barrel is divided into a compression cavity and a piston cavity, a travel groove is formed on one section of the piston cavity of the coal sample barrel, and displacement graduations are graved on the side of the travel groove. The determination device is capable of carrying out direct, multipoint and quick determination of the coal firmness coefficient down the hole with compact structure, convenient carrying and simple operation.
Description
technical field [0001] The invention relates to coal mining safety technology, in particular to a method for quickly measuring the firmness coefficient of coal and a portable measuring device used therefor. Background technique [0002] Coal and gas outburst (hereinafter referred to as outburst) is an extremely complex gas dynamic phenomenon that occurs underground in coal mines, which poses a serious threat to coal mine safety production. It is the result of the combined effects of ground stress, gas and coal physical and mechanical properties . In-situ stress and gas pressure are the dynamic factors for outburst, while the anti-destructive ability of coal is the resistance factor for outburst, which is mainly related to parameters such as coal mechanical strength, fracture development degree and coal structure. For outburst coal seams, the determination of mechanical parameters such as coal strength is relatively complicated, while the determination of coal firmness coeff...
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IPC IPC(8): G01N3/08G01N1/08G01N1/36G01N33/22
Inventor 文光才赵旭生邹银辉康建宁刘胜
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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