Variable pyramid type drilling powder discharging and pressure relieving method

Abstract

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.

Description

technical field [0001] The invention relates to the field of variable-diameter pyramid-type drilling for pressure relief in coal mining or metal mining, and in particular to a powder discharge and pressure-relieving method for variable pyramid-type drilling. Background technique [0002] Compared with shallow mining, the stress environment of deep mining coal and rock mass is more complex, and affected by high stress, strong mining disturbance and complex geological structure, the frequency and intensity of rock bursts increase significantly. At present, the research on rock burst has achieved rich research results, but due to the "opacity" of the underground rock mass itself and the uncertainty of the stress environment in which it is located, rock burst is still a thorny problem faced by coal mine scientific and technological workers. [0003] In response to the above problems, many scholars have made great progress in the current research on the comprehensive prevention a...

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Problems solved by technology

[0006] CN204060516U discloses a kind of dry-type inner powder discharge drill bit, mainly adopts the discharge hole on the drill bit body to realize the discharge of dry powder, the drill bit body of this device is cylindrical, and the drill bit body is parallel to the rock wall in the rock body, and cannot form effective Therefore, the powder discharge efficiency of the drill bit is low, and the drill bit cannot be applied to the forward-type fully automatic controllable variable-diameter pressure relief connecting rod

[0007] CN108979549B discloses a dry-type internal powder discharge drill bit, which mainly uses a helical cutter and a through hole to realize the discharge of dry powder. Suitable for drilling in soft rock mass, while the strength of the helical cutter is low, resulting in poor stability of the drill bit

[0008] In summary, the test methods and related devices in the prior art have not realized the problem of changing the structure of the drill bit for complex rock mass, nor have they solved the problem of rapid powder discharge and rapid drilling. Therefore, relevant researchers in this field are committed to In the development of a variable pyramid-type drilling powder discharge pressure relief method

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