Abstract: In this paper, in view of the low power and high efficiency, the high-pressure small jet equipment and facilities suitable for putting in roadway were developed, including the hydraulic control system consisted of hydromotor, high-pressure oil tube and premissible motor, the remote monitoring system consisted of explosion-proof computer and camera apparatus, the punching system consisted of high-pressure water jet, gearing, high-pressure tube and water pump. Meanwhile, the tightness and pressure resistance of device were improved by the pressure and running test in laboratory. The field test results show that the high-pressure jet with a certain pressure and flow has the ability to break the coal body, and the punching gets deeply as the jet pressure increases. Moreover, under a certain pressure, increasing the flow is more favorable to improve the reaming effect, which makes more residual coal vent outside the borehole and improves the punching speed.

Key words: high-pressure small jet, punching, device for outburt prevention, monitoring system