Swinging chain used for hole expanding drill bit

Abstract

The invention relates to the field of coal mine drilling, in particular to a swinging chain used for a hole expanding drill bit. The swinging chain comprises a chain body; an armored metal high-pressure hose is arranged in the chain body in a penetrating mode; diamond composite sheets are arranged on the surface of the chain body; a hose connector is arranged on one end of the armored metal high-pressure hose and a high-pressure spray nozzle or clogging head is arranged at the other end; the spray nozzle or the clogging head is fixed in a chain knot at the tail end of the chain body; the hoseconnector is arranged on the head part of the chain body; a clip-on is arranged on a chain link on the head part of the chain body; the chain body is connected with a corresponding hanging connectionpart on the hole expanding drill bit via the clip-on; and the armored metal high-pressure hose is connected with a high-pressure water port on the hole expanding drill bit. The swinging chain is simple in structure, high in degree of freedom and good in wear resistance; the swinging chain is not prone to being stuck, flexible advancing and retraction of the hole expanding drill bit can be guaranteed, and repairing and maintenance are convenient; and the swinging chain is beneficial to improving hole expanding efficiency, and the reliability of a hole expanding device is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of coal mine drilling, and in particular relates to a swing chain used on a 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 low work efficiency. [0004] For ...

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, and low work efficiency

Images