Drill rod for coal mine underground gas extraction drill hole protection

Abstract

The invention provides a drill rod for coal mine underground gas extraction drill hole protection, and belongs to drill rods for drilling holes and laying hole protecting pipes. The drill rod comprises a male buckle connector, a female buckle connector, a rod body and a guide pipe. The rod body is round, the male buckle connector is connected with one end of the rod body, and the female buckle connector is connected with the other end of the rod body. The guide pipe is round, and the outer diameter of the guide pipe is smaller than the inner diameter of the rod body. The guide pipe penetrates through the interior of the rod body, the male buckle connector is connected with one end of the guide pipe, and the female buckle connector is connected with the other end of the guide pipe. The inner diameter of the male buckle connector, the inner diameter of the female buckle connector and the inner diameter of the guide pipe are equal. The inner diameter of the male buckle connector, the inner diameter of the female buckle connector and the inner diameter of the guide pipe are equal, and thus when a hole protecting pipe penetrates from a drill hole, the phenomenon that the hole protecting pipe is clamped and cannot pass through due to the fact that the hole protecting pipe meets a reducing step can be avoided. The drill rod structure is only formed by the male buckle connector, the female buckle connector, the rod body and the guide pipe, coaxiality is high, the structure is stable, the weight is low, the hole protecting pipe can penetrate through the inner hole of the drill rod smoothly, and meanwhile field operation is convenient.

Description

technical field [0001] The invention relates to a drill pipe for opening and protecting holes, in particular to a drill pipe for drilling and protecting holes for underground gas drainage in coal mines. Background technique [0002] Soft coal seams account for a relatively large proportion of coal mines in my country, and the easy deformation and collapse of drilling holes in soft coal seams is a major problem that plagues gas control in soft coal seams. Lowering the gas drainage screen into the borehole can resist borehole deformation to a certain extent, and even if the borehole collapses, it can provide a continuous channel for gas gushing out. This method has been adopted in many mining areas. Since the trajectory of the borehole itself is non-linear, manually pushing the borehole protection pipe into the borehole is easy to get stuck, which is difficult and has a low success rate. Chinese patent (patent No. CN101446178A) discloses a wind pressure air drilling equipment...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a drill pipe for drilling hole protection for underground gas drainage in coal mines, so as to solve the problem that it is difficult to feed the hole protection pipe into the drilling hole of soft coal seam

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