The invention discloses a variable
pyramid type drilling
powder discharging and pressure relieving method, and belongs to the field of drilling pressure relieving for
coal mining or
metal mining. Thevariable
pyramid type drilling
powder discharging and pressure relieving method is performed through a pressure relieving connecting rod and a
powder discharging and pressure relieving
drill bit, wherein the powder discharging and pressure relieving
drill bit is mounted at the front end of the pressure relieving connecting rod, the
tail end of the pressure relieving connecting rod is connected with a
drill rod, and the powder discharging and pressure relieving
drill bit comprises a crushing and exhausting
cutting tooth part, a detachable
cutting tooth part and a spiral powder discharging end cover part which are sequentially connected from front to back; the crushing exhaust
cutting tooth part comprises a crushing and exhausting cutting tooth body, an axial crushing tooth, a radial cuttingtooth I and an air guide hole are respectively arranged on the crushing and exhausting cutting tooth body, and the detachable cutting tooth part is formed by sequentially connecting a plurality of groups of detachable cutting tooth single bodies which are arranged in the
pyramid shape to be favorable for powder discharging; and the spiral powder discharging end cover part comprises a spiral powder discharging end cover body, and a spiral powder discharging groove and an air inlet hole are formed in the spiral powder discharging end cover body. Under the action of high-pressure gas, rapid powder discharging and rapid drilling can be achieved in a target area in the drilling process.