Drilling rod with asymmetric special-shaped cross section

Abstract

The invention discloses an asymmetric deformed-section drill pipe which is composed of a hollow pipe body and a connecting piece which are detachably connected; beads which are more than or equal to two and less than or equal to eight are arranged on pipe body along the pipe body, and the outer surface of the bead is an arc surface which takes an axle wire of the pipe body as a circle center, and one side of the bead and the pipe body form a long-strip groove. The drill pipe has reasonable design and simple structure; drill adsorption and drill blocking can not easily happen according to the principle of vortex flow caused by rotation of the deformed-section rigid body in loose coal slag, therefore, the drill pipe is safe and reliable, slag-off effect is greatly improved, thus being beneficial to improving drilling depth, shortening drilling time and improving working efficiency and pore-forming efficiency and being worth of being popularized and applied in coal mine 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 an asymmetric special-shaped cross-section drilling rod suitable for gas drainage drilling in soft coal seams and outburst coal seams. Background technique [0002] Underground gas drainage drilling is divided into coal seam drilling and rock drilling. There are two types of drill pipes commonly used, 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 drill pipe that relies on fluid Smooth round drill pipe for slagging (fluid slagging drill pipe, fluid includes air flow and water flow). Smooth round drill pipes are generally used in rock drilling construction, and hydraulic slag discharge is used as a supporting tool; smooth round drill pipes and auger drill pipes can also be used in coal seam drilling construction. The a...

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Problems solved by technology

The above two kinds of drill pipes have defects when drilling in soft coal seams, which are mainly manifested in: when smooth round drill pipes are drilled in soft coal seams, the slag discharge system is prone to clogging, and it is difficult to realize deep hole drilling; The construction efficiency is low in the drilling of soft coal seams, and the phenomenon of suction and sticking of drill often occurs, and it is also difficult to realize deep hole drilling

[0003] In addition, the published Chinese patent invention "Extrusive Coal Seam Grilling Hole Cooling Drilling Tool and Its Drilling Method", the patent publication number is CN101131069A, adopts two methods of engraving spiral grooves on smooth round drill rods or welding flat steel plates. Drilling in soft coal seams has some effect, but the drilling depth is still not satisfactory

Chinese patent CN01267191.6 discloses "drill pipe for deep-hole drilling rig with high gas in soft coal seam" and Chinese patent CN200720306879.8 discloses "arc-shaped convex rib gas drainage drill pipe", which changes the cross-sectional shape of the drill pipe into a rib shape. The symmetrical triangular drill pipe has also achieved certain effects in drilling soft coal seams, but the use effect and drilling depth are still not up to the ideal state

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