Carbon dioxide induced cracking device for coal seam seal holes

Abstract

The invention relates to the technical field of sealing and bursting coal mine boreholes, and particularly relates to a carbon dioxide induced cracking device for coal seam seal holes. The device comprises a main pipe 1, a heating device 2, a detonation head 3, an energy depleting device 4, a protective cover 5 and a borehole sealer 6, wherein the heating device 2 is arranged in a charging cavity 11 inside the main pipe 1, the bursting head 3 is arranged on the front end of the main pipe 1, the energy depleting device 4 is arranged on the rear end of the main pipe 1, and the protective cover 5 and the borehole 6 are arranged on the rear end of the energy depleting device; an energy depleting channel 31 is arranged on the bursting head 3, one end of the energy depleting channel 31 is connected with the charging cavity 11 of the main pipe 1, and the other end of the energy depleting channel 31 is connected with a carbon dioxide mining device; the energy depleting device 4 consists of an energy depleting head 41 and an energy depleting channel 42, and a constant-pressure energy depleting sheet 7 is airtightly arranged between the energy depleting channel 42 and the charging cavity 11 of the main pipe 1 and can force the heating device to heat and gasify liquid-state carbon dioxide charged into the charging cavity 11 of the main pipe 1 and be expanded to generate bursting force. The device is characterized in that a carbon dioxide flow adjusting valve 8 is arranged at the position where the carbon dioxide mining device is communicated with the energy depleting channel 31 of the bursting head 3. Sparks are not generated during bursting induced cracking full process, the cracked coal blocking forming rate is high, no destructive oscillation and oscillatory wave are generated, the collapse and cracking damage of other places cannot be caused, and the bursting force is easily controlled.

Description

technical field [0001] The invention relates to the technical field of coal mine drilling plugging and bursting, in particular to a carbon dioxide cracker for coal seam hole sealing. Background technique [0002] Explosive blasting is still one of the methods of coal mining. Explosive blasting is powerful and fierce, and it is a typical open flame blasting. However, there are many defects in open flame blasting, and there are high requirements for use conditions, use environment, daily management, etc., especially in coal mines. Many coal mine gas accidents are caused by open flame explosions. Simultaneously, the cases of other accidental explosions due to explosives also occur from time to time, which has affected safe production and caused economic losses. [0003] Long Aido Company of the United States began to study high-pressure gas blasting coal breaking technology as early as 1938. By the 1950s and 1960s, some relatively developed countries in the world, such as Br...

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Problems solved by technology

[0004] However, there are many application problems in existing carbon dioxide e

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