Mining reamer bit

Abstract

The invention belongs to the technical field of coal mine drilling, and particularly relates to a mining reamer bit. The mining reamer bit comprises a bit body, wherein a drill tip is arranged at oneend of the bit body, a threaded inner hole used for being connected with a drill rod is arranged at the other end, a spiral guiding groove is formed in the excircle surface of the bit body, a bit edgeis arranged at the drill tip, a tungsten carbide and diamond composite wear-resistant layer is arranged on the bit edge, multiple ring-shaped throwing chains or ring-shaped steel cables are arrangedon the excircle surface of the bit body in the axial direction at intervals, a throwing gap is reserved between each ring-shaped throwing chain or ring-shaped steel cable and the excircle surface of the bit body, and diamond compacts are uniformly distributed on the sides, away from the bit body, of the ring-shaped throwing chains or ring-shaped steel cables. The mining reamer bit is simple in structure and high in flexibility and reliability and is not prone to jamming, and brings convenience in drilling retreat while guaranteeing efficient reaming, and overhauling and maintaining costs of the mining reamer bit can be reduced.

Description

technical field [0001] The invention belongs to the technical field of coal mine drilling, and in particular relates to a mine 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, and high maintenance costs. [0004] For this reason, n...

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 particles are clamped between them, resulting in insufficient shrinkage, affecting the drill back, poor reliability of the device, and high repair and maintenance costs

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