Coal mine underground coal bed drilling and cave-building device and method of use

Abstract

The invention relates to a coal mine underground coal bed drilling and cave-building device and a method of use. The effect of extracting gas can be improved by increasing the diameter of a drill hole, and the diameter of the drill hole can be infinitely increased theoretically through a repeatedly reaming technique; but in practice, under the limitation of the power of a drilling machine and the strength of a drilling tool, multiple specifications of drill bits are needed, and during a repeatedly drilling operation, the drill bit needs to be changed to ream, so that the working procedure is complex, and the hold-up time is long. The coal mine underground coal bed drilling and cave-building device is characterized by comprising a tool joint, a transmission shaft, a pressure-loaded bearing and a shell, wherein an L-shaped cutting arm is arranged in the shell, and the bent part of the cutting arm is fixedly arranged on the shell through a pin shaft; one end of the transmission shaft is connected with the tool joint, the other end of the transmission shaft is movably connected with one end of the cutting arm through a state control connection rod, and the other end of the cutting arm is arranged in a strip-shaped opening of the shell; and a reset spring is arranged on the transmission shaft. The coal mine underground coal bed drilling and cave-building device disclosed by the invention has the advantages that the structure and the method of use are simple, and the diameter of the drill hole can be increased at a shorter time.

Description

technical field [0001] The invention belongs to the technical field of coal seam drilling, and relates to an underground coal seam drilling and cavitation device in a coal mine and a use method thereof. Background technique [0002] Due to the generally low permeability of coal seams, it is very difficult for my country's coal mining enterprises to achieve the desired effect within a limited extraction time using ordinary gas drainage methods. Enterprises have an urgent need to improve the efficiency of gas extraction. [0003] Increasing the diameter of the borehole can significantly improve the effect of gas drainage. Currently, the large-diameter gas drainage drilling technology has been popularized underground. However, large-diameter drilling requires high-power drilling rigs and high-strength drilling tools, and it is easy to induce gas outburst in outburst coal seams, so the drilling diameter of one-time drilling is limited. Theoretically, multiple reaming technology...

AI Technical Summary

Problems solved by technology

However, large-diameter drilling requires high-power drilling rigs and high-strength drilling tools, and it is easy to induce gas outburst in outburst coal seams, so the drilling diameter of one-time drilling is limited

Theoretically, multiple reaming technology can increase the drilling diameter infinitely, but in practice, limited by the power of the drilling rig and the strength of the drilling tool, the drilling diameter is generally limited to within φ300mm. At the same time, it is necessary to use multiple specifications of the drill bit, and it needs to be pulled out and replaced many times. Drill bit reaming, the process is complicated, takes a long time, and the actual operation is restricted

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