Abstract:

In order to eliminate the phenomenon of jet orifice on the underground of high-gas coal mine or outburst coal seam about drilling holes, ensure the safety of drilling construction, and reduce the concentration of dust in drilling construction, this paper provides a new type and multifunctional blowout prevented and dust controlled device in mine. Its working principle is simple and sealing is better. It can be manipulated and applied quickly and easily in the underground. The application of this device on drilling construction on blowout prevented and Dust Controlled in the 2709 return airway of Cheji coal mine, showed that: the phenomenon of jet orifice does not appear after using this device during construction process with the completed 127 drill holes, and the highest concentration of the gas sensor of the display does not exceed 0.4%, the average concentration ranges from 0.1 to 0.3 % during construction process with the single drill hole, and carbon monoxide sensor data are displayed from 10 to 20ppm; the highest dust concentration does not exceed 85mg / m3 with 20 of those holes in which the construction process of the data collected , the average hole into the hole concentration of dust generated in the 35 to 60mg / m3 .

Key words: Gas drainage, jet orifice, dust, carbon monoxide