The invention discloses an outburst
coal seam hole protection and pressure relief in-hole drilling tool and a special out-hole sealing and deslagging
system thereof. The in-hole drilling tool comprises a double-channel
sieve hole
drill bit and a plurality of double-channel
sieve hole
drill rods. The out-hole sealing and deslagging
system comprises an outer sealing
assembly, a carved seam inner sealing
pipe and a
drill tail flow supply and deslagging
assembly. The drilling tool is matched with the out-hole sealing and deslagging
system for use; the outer
diameter of each double-channel
sieve hole drill rod is close to the
diameter of the
drill bit, and the double-channel sieve hole drill rods have the hole protection effect; spiral grooves and spiral convex ribs are arranged on the outer surfaces of the drill rods, pressure relief sieve holes are formed along the spiral grooves and the spiral convex ribs, and the pressure relief sieve holes can relieve pressure on the outer surfaces of the drill rods; out-hole exposed sieve holes of the double-channel sieve hole drill rods are sealed with the outer sealing
assembly and the carved seam inner sealing
pipe, so that the leakage and loss of
slag discharge air flow or
water flow are prevented; and the in-hole drilling tool has the functions of hole protection and pressure relief, and an inner
slag discharge channel is of a steel sieve hole structure, so that the smoothness of the inner
slag discharge channel can be ensured, the gas over-limit accident of a spray hole can be prevented, the excessive hole collapse of a
drill hole wall is restrained, the hole forming quality is improved, and the
drill hole skewness is reduced.