Annular hole sealing device for coal mine gas extraction drill hole

Abstract

The invention discloses an annular hole sealing device for a coal mine gas extraction drill hole. The annular hole sealing device comprises a gas extraction pipe. An annular aluminum foil bag is bonded to the outer surface of the gas extraction pipe and is divided into a left bin chamber and a right bin chamber through two raw material blocking pull rods in the axial direction, and the left bin chamber and the right bin chamber are filled with an expansive polyurethane component A and an expansive polyurethane component B correspondingly. The annular hole sealing device can be rapidly fixed to the gas extraction pipe through a bonding strip on the annular hole sealing bag; all-dimensional wrapping of the extraction pipe by the polyurethane hole sealing materials is further achieved; the effect that the expansive polyurethane materials can be uniformly expanded in the space between the drill hole and the pipe after reaction is ensured; the hole sealing effect of the polyurethane hole sealing materials on the section of the gas extraction drill hole is ensured; the hole sealing quality of the polyurethane materials is improved; and the mine gas extraction drill hole extraction negative pressure and the gas concentration are further improved.

Description

technical field [0001] The invention relates to a coal mine gas drainage technology, in particular to a coal mine gas drainage drilling and sealing device, which belongs to the technical field of mining machinery. Background technique [0002] At present, the polyurethane materials used in the drilling and sealing of underground gas drainage in coal mines are designed to be packed in rectangular bags. During the sealing process, on the one hand, the operation of bundling the polyurethane materials in rectangular bags is cumbersome, time-consuming and inefficient; on the other hand , it is difficult to completely wrap the section of the extraction pipe after the rectangular bagged polyurethane material is bundled, resulting in that after the expansion and foaming of the polyurethane material, the filling cannot completely effectively fill the space between the extraction pipe and the borehole, resulting in The compactness effect of the space between the pipe and the drilled h...

AI Technical Summary

Problems solved by technology

[0002] At present, the polyurethane materials used in the drilling and sealing of underground gas drainage in coal mines are designed to be packed in rectangular bags. During the sealing process, on the one hand, the operation of bundling the polyurethane materials in rectangular bags is cumbersome, time-consuming and inefficient; on the other hand , it is difficult to completely wrap the section of the extraction pipe after the rectangular bagged polyurethane material is bundled, resulting in that after the expansion and foaming of the polyurethane material, the filling cannot completely effectively fill the space between the extraction pipe and the borehole, resulting in The space compaction effect between the tube and the drill hole is not ideal, and the gap of conduction is easy to appear

The above influencing factors will make the expansion of the polyurethane sealing material unable to completely seal the gas drainage drilling section, seriously affecting the sealing effect of the polyurethane material, and even affecting the subsequent grouting process, which will eventually lead to gas drainage in the drilling hole. The emergence of a series of problems such as low mining negative pressure, low gas concentration, and low extraction efficiency

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