Outburst coal seam shield pressure relief in-hole drilling tool and out-hole sealing system thereof

Abstract

The invention discloses an outburst coal seam shield protection pressure relief in-hole drilling tool and an out-hole sealing system thereof, the in-hole drilling tool comprises a sieve hole drill bit, a plurality of sieve hole drill rods and a plurality of flow supply pipes, and the out-hole sealing system comprises a hole sealing dustproof assembly and a sliding type inner sealing pipe; the outer diameter of the sieve pore drill rod is close to the diameter of the drill bit, and the outer wall of the sieve pore drill rod has a shield effect on a drill hole; a spiral groove or a spiral convex rib or a plane is arranged on the outer surface of the sieve pore drill rod, slag discharge sieve pores are formed along the spiral groove or the spiral convex rib or the plane, and the slag discharge sieve pores have a pressure relief effect on the drill rod; and the hole sealing dustproof assembly and the sliding type inner sealing pipe are used for sealing exposed screen holes of the out-hole screen hole drill rod, gas flow or water flow or dust is prevented from leaking out through the screen holes, and the sliding type inner sealing pipe further has the function of centralizing and positioning the flow supply pipe. The in-hole drilling tool can be used for straight drilling or directional drilling, and once the inner deslagging channel is blocked, the inner deslagging channel can be dredged by rotating the flow supply pipe.

Description

technical field [0001] The invention relates to the field of coal mine gas drainage drilling technology, in particular to a drilling tool in a pressure relief hole of an outburst coal seam shield and its outer sealing system, which is used for gas drainage drilling in outburst coal seams and soft-hard composite coal seams. Construction, the drilling tool can be used for straight hole drilling and cable-free directional straight hole drilling. Background technique [0002] There are three problems to be solved in the drilling construction of gas drainage in outburst coal seams. Intermittent blockage of the external slag discharge channel. The intermittent blockage and unblocking of the external slag discharge channel will lead to the gas exceeding the limit of the injection holes. Incomplete statistics show that the gas exceeding the limit caused by drilling injection holes in outstanding mines accounts for 60% of the total number of gas exceeding the limit. to 80%; the seco...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned existing problems. The present invention provides a drilling tool in the outburst coal seam shield pressure relief hole and its outer sealing system, which aims to solve the problem of drilling and injection holes in the outburst coal seam, improve the straightness of the drill hole, Drilling depth and hole quality

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