Efficient hole-expanding drill bit

Abstract

The invention relates to an efficient hole-expanding drill bit which belongs to the technical field of drilling. The efficient hole-expanding drill bit comprises a drill bit body, wherein one end of the drill bit body is provided with a drill tip, and the other end of the drill bit body is provided with a threaded inner hole; a throwing chain or a steel cable is wound on the outer circular surfaceof the drill bit body in a ring-shaped mode; the throwing chain or the steel cable is spirally arranged in the axial direction of the drill bit body; a high-pressure hose is arranged in the throwingchain or the steel cable in a penetrating mode; the two ends of the high-pressure hose are connected to tube joints correspondingly arranged on the drill bit body; a high-pressure water path is arranged in the drill bit body; the tube joints communicate with the high-pressure water path; traction chains or traction steel wire ropes are axially arranged on the outer circular surface of the drill bit in a spaced mode; one end, away from the drill bit, of the traction chain or the traction steel wire rope is connected to the throwing chain or the steel cable on the opposite position; and diamondcomposite sheets are uniformly distributed at one side, away from the drill bit body, of the throwing chain or the steel cable. The efficient hole-expanding drill bit is simple in structure, is high in flexibility and reliability, is not liable to block, is convenient in drill withdrawal, is high in hole-expanding efficiency, and is low in maintenance cost.

Description

technical field [0001] The invention belongs to the technical field of coal mine drilling, and in particular relates to a high-efficiency reaming drill bit. Background technique [0002] Before coal mining, it is necessary to drill holes to extract gas. When drilling, it is necessary to drill from the rock layer to the coal seam. The boreholes in the coal seam section are reamed to expand the surface area of ​​the inner holes in the coal seam and improve the gas overflow efficiency. [0003] Existing reaming drills generally use the reaming arm to ream the hole. The connection between the reaming arm and the drill pipe is subject to a large stress impact during the reaming process, which is prone to fatigue damage, and the reaming arm is easy to contact with the drill pipe when it shrinks. Large pieces of coal are clamped between them, resulting in insufficient shrinkage, affecting the drill back, poor reliability of the device, low work efficiency, and high maintenance cos...

AI Technical Summary

Problems solved by technology

[0003] Existing reaming drills generally use the reaming arm to ream the hole. The connection between the reaming arm and the drill pipe is subject to a large stress impact during the reaming process, which is prone to fatigue damage, and the reaming arm is easy to contact with the drill pipe when it shrinks. Large pieces of coal are clamped between them, resulting in insufficient shrinkage, affecting the drill back, poor reliability of the device, low work efficiency, and high repair and maintenance costs

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