Abstract: Based on the problem of non-recovery, high cost, a waste of time, laboriousness, low efficiency and so forth which existed in the current domestic existing technology of hole sealing for gas drainage, the device of recyclable and rapid hole sealing by high-pressure expansion has been developed through theoretical analysis and repeated test. Field application and observation showed that the device which is easy to operate and can be reused by multiple drilling is able to provide large enough hole sealing pressure and high safety. The drainage concentration of the gas in the coal seam has increased by 40% to 60% when compared with traditional technology. Thus, under the premise of workers' personal safety, the effect of hole sealing and efficiency of gas extraction can be further improved. Promoting this technology can reduce the production cost greatly.

Key words: hole sealing, high-pressure expansion, rapid, recyclable