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Coal mine underground self-suction abrasive jet flow drill bit and drilling method

An abrasive jet and self-priming technology, which is applied in the direction of drill bits, earthwork drilling, drilling equipment, etc., can solve the problems of drill bit wear and low drilling efficiency, and achieve the effects of small resistance loss, simple structure and reasonable design

Active Publication Date: 2014-02-05
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, provide a self-priming abrasive jet drill bit and drilling method in coal mines, and solve the problems of severe wear and low drilling efficiency of existing drill bits

Method used

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  • Coal mine underground self-suction abrasive jet flow drill bit and drilling method

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Embodiment Construction

[0025] The following combination Figure 1 to Figure 5 Embodiments of the present invention are described:

[0026] combine figure 1 It can be seen that the front end of the drill bit body 8 of the drill bit is the main crushing structure, which is composed of three cutting blades 1 and three-lobe crushing teeth 4, the three-lobe crushing teeth 4 are arranged around the central cavity 3, and the three cutting blades 1 are fixed by brazing At the front end of the three-lobe broken tooth 4.

[0027] combine figure 2 It can be seen that the drill body 8 of the self-priming abrasive jet drill bit is a front-to-rear through structure with a central cavity 3, and the rear end of the drill body 8 is a drill pipe connection end 9 with an interface with an internal thread.

[0028] The abrasive jet nozzle 2 is installed in the front part of the central cavity 3, the front end pipe diameter is small, which is the acceleration chamber 12, and the rear end pipe diameter is trumpet-sha...

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Abstract

The invention discloses a coal mine underground self-suction abrasive jet flow drill bit which can utilize the combination of abrasive jet flow guiding smash and mechanical smash to increase the drilling speed during the coal mine underground drilling operation. The self-suction abrasive jet flow drill bit comprises an abrasive jet flow nozzle, a self-suction device and a main smashing structure, wherein the self-suction device comprises a cavity, a filter screen, a support ring positioned inside the cavity and an inlet nozzle positioned at the rear end of the cavity. According to the invention, coal debris generated in the drilling process can be sifted by the filter screen, then enters the inside of the cavity of the self-suction device, and is fully mixed with a water jet flow to form an abrasive jet flow, the abrasive jet flow is jetted from the abrasive jet flow nozzle to perform guiding smash on coal and rock mass; the main smashing structure of the drill bit comprises three cutting pieces and three main smashing teeth, and a finished drill-hole can be formed under the mechanical smash action of the main smashing structure. The invention further relates to a method for utilizing the drill bit to drill in an underground coal mine. The drill bit has high drilling speed and little abrasion, and can be widely applied to coal mine underground drilling operation.

Description

technical field [0001] The invention relates to a drill bit and a drilling method for underground drilling in coal mines, in particular to a self-priming abrasive jet generation technology. Background technique [0002] my country's coal mine disasters and accidents are very serious, among which coal and gas outburst are the most important accidents. Gas drainage is one of the most effective methods for controlling gas disasters in coal mines, and underground gas drainage in coal mines is mainly realized by drilling, that is, coal mines need to drill holes to drain gas in advance when digging coal in Shimen and tunneling. However, at present, cemented carbide drill bits and PDC drill bits are mainly used in the underground drilling construction of coal mines in my country. The field construction shows that the drilling speed is relatively slow when using this type of drill bit, especially when drilling in the rock formation, the drill bit is severely worn, which greatly redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/18E21B10/60
Inventor 卢义玉葛兆龙张欣玮周哲孙大发陈久福
Owner CHONGQING UNIV
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