Irregularly shaped multi-land notch groove drill rod

Abstract

The invention discloses an irregularly shaped multi-arris notch groove drill rod, which consists of a hollow multi-arris rod body and a connecting piece, the section outline of the multi-arris rod body consists of tangential paths and circular arc sections, and incontinuous spiral grooves are distributed on the surface of the rod body simultaneously. The drill rod can cause vortex flow when whirling in loose cinder and raise coal dust deposited on the bottom of a drilling hole in virtue of the arris of the drill rod, and the coal dust in the drilling hole is at a moving status all the time, thus preventing the coal dust from accumulating in the drilling hole and resulting in blockage; simultaneously, the incontinuous spiral grooves distributed on the surface can assist in the outward transmission of the cinder, and when hole collapsing in the drilling hole, the outside of the collapsed hole is unchoked by the hole digging function of the spiral grooves, thus being not easy to have drill absorption and drill blockage. The drill rod has the advantages of reasonable design, simple structure, safety and reliability, thus greatly improving deslagging effect, being beneficial to increasing the depth of the drilling holes, shortening hole drilling time, improving work efficiency and having high hole forming rate. Therefore, the drill rod is worth popularizing and applying in mining enterprises.

Description

technical field

[0001] The invention belongs to the technical field of underground gas drainage drilling in coal mines, and in particular relates to a special-shaped multi-edged grooved drilling rod suitable for gas drainage drilling in soft coal seams and protruding coal seams. Background technique

[0002] In the process of coal mining, for coal and gas outburst coal seams, the gas in the coal seam needs to be drained before coal mining, and the gas in the coal seam needs to be drilled in the coal seam. There are two commonly used drill pipes. One is the auger drill pipe (mechanical slag discharge drill pipe) that relies on the rotary power of the drilling rig to discharge slag, and the other is the smooth round drill pipe that relies on fluid slag discharge (fluid slag discharge drill pipe, the fluid includes air flow and water flow), When using smooth drill pipes, the "drilling holes" (quasi-filled caves whose diameter is much larger than the theoretical diameter of the ...

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