Coal and gas outburst jet characteristic simulation experiment device

Abstract

The invention belongs to an experiment device for gas monitoring in a coal mine and particularly relates to a coal and gas outburst jet characteristic simulation experiment device. The upper end of a sleeve (1) is in threaded connection with an upper end cover (2), and the lower end of the sleeve (1) is in threaded connection with a lower end cover (3); a lower pressing plate (7) is installed between the inside of the sleeve (1) and the lower end cover (3); a lower positioning plate (9) is installed between the lower pressing plate (7) and the sleeve (1); a solid pressure measuring plate (10) is arranged on the lower positioning plate (9); an oil cylinder (13) is embedded on the solid pressure measuring plate (10); a hollow side pressing plate (11) is arranged on the lower positioning plate (9) at the right side; upper positioning plates (8) are arranged on the hollow side pressing plate (11) and the solid pressure measuring plate (10); an upper pressing plate (6) is arranged above a coal sample (16); a baffle (5) is arranged above the sleeve (1); a piston rod (4-1) is arranged in a central hole of the baffle (5); and a piston (4) is arranged between the inside of the upper end cover (2) and the baffle (5). The coal and gas outburst jet characteristic simulation experiment device has the beneficial effects that the influence of passively opening an outburst port on outburst energy due to slow speed is avoided, the pressure is kept constant, and the required pressure can be accurately adjusted.

Description

technical field [0001] The invention belongs to an experimental device for gas monitoring in coal mines, in particular to a simulated experimental device for coal and gas outburst jet flow characteristics. Background technique [0002] With the gradual development of my country's coal mine resource mining to the deep, the frequency of coal and gas outbursts is increasing, and its hazards are also increasing, causing great harm to the safety of coal mine production. Coal and gas outburst is an extremely complex mine dynamic phenomenon, and its occurrence is affected and restricted by many factors. However, the current research on coal and gas outburst is far from reaching the level of clear mechanism and clear rules. Some existing coal and gas outburst Although the outburst test device has deepened the research progress of the coal and gas outburst mechanism to a certain extent, it still has the following shortcomings: most of the outburst coal samples simulated by the experi...

AI Technical Summary

Problems solved by technology

Coal and gas outburst is an extremely complex mine dynamic phenomenon, and its occurrence is affected and restricted by many factors. However, the current research on coal and gas outburst is far from reaching the level of clear mechanism and clear rules. Some existing coal and gas outburst Although the outburst test device has deepened the research progress of the coal and gas outburst mechanism to a certain extent, it still has the following shortcomings: most of the outburst coal samples simulated by the experimental device are small in size, and the small size coal samples cannot change the outburst process. The law is fully revealed; especially in the outburst simulation test device, the opening method of the outburst is a passive manual mechanical method, and the opening speed is relatively slow, which affects the time and intensity of coal and gas outburst and the accuracy of the law to a certain extent

In addition, in the past, the loading pressure on coal samples was mostly not stabilized at a fixed value. When outburst occurred, it was impossible to judge at which pressure value the coal sample was outburst. Therefore, it was difficult to find out the critical pressure value of coal and gas outburst.

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