Permeability enhancement device for coal-seam gas drainage

A permeability enhancement device for coal-seam gas drainage, wherein, comprising:

• a high-pressure gas cylinder, an air compressor, a drill pipe, jet nozzles, and self-driving drill bits;
• the high-pressure gas cylinder is configured to store a gas medium;
• and
• the air compressor is connected to a gas outlet of the high-pressure gas cylinder, and is configured to pressurize the gas medium in the high-pressure gas cylinder;
• and
• an end of the drill pipe is provided with a drill bit;
• and
• a plurality of the jet nozzles are evenly disposed in a circumferential direction of the drill pipe, and the jet nozzles are located below the drill bit, the jet nozzles are arranged outwards along a radial direction of the drill pipe, and the jet nozzles are in communication with the gas outlet of the high-pressure gas cylinder;
• and
• a plurality of the self-driving drill bits are evenly disposed in the circumferential direction of the drill pipe, and the self-driving drill bits are located below the jet nozzles, a front end of the self-driving drill bits is radially defined with a plurality of front spray holes, and the self-driving drill bits are in communication with the gas outlet of the high-pressure gas cylinder;
• and
• the gas outlet of the high-pressure gas cylinder is connected with a self-driving manifold, the self-driving manifold is provided with a self-driving gas supply valve, which is configured for controlling an on-off of the self-driving manifold;
• and
• the self-driving manifold is connected with a plurality of self-driving branch pipes, each self-driving branch pipe is correspondingly connected to at least one self-driving drill bit, and an air is supplied to the self-driving drill bits through the self-driving branch pipes;
• and
• the self-driving drill bits comprise a high-pressure hose and a nozzle, one end of the high-pressure hose is in communication with the self-driving branch pipes, and an other end of the high-pressure hose is in communication with the nozzle;
• a plurality of the front spray holes are radially defined at the front end of the nozzle.