A gas drainage and sealing device

Abstract

The invention discloses a gas drainage and sealing device, which includes a gas drainage pipe, wherein the gas drainage pipe is provided with a first fixed rigid baffle and a second fixed rigid baffle, and the first fixed rigid baffle is a A first solid rubber body is arranged on one side of the second fixed rigid baffle, and a second solid rubber body is arranged on one side of the second fixed rigid baffle, and the outer circumference of the gas drainage pipe between the first solid rubber body and the second solid rubber body forms a receiving cavity A telescopic mechanism for deforming the first solid rubber body and the second solid rubber body is arranged in the accommodating cavity. Squeeze the first solid rubber body and the second solid rubber body of the gas drainage and sealing device through the telescopic mechanism, so that the radial deformation of the solid rubber body increases to achieve the sealing effect and reduce the cost of sealing and gas drainage; The hole sealing device is easy to operate and has remarkable effects, which can prevent external air from entering the extraction borehole, effectively reduce the cost of hole sealing, and improve the quality and efficiency of the two-time sealing of the hole.

Description

technical field [0001] The invention relates to a gas drainage and sealing device. Background technique [0002] Mine gas seriously threatens the safe production of coal mines, and gas disasters cause many casualties and huge property losses every year. The state requires that high-gas mines must be pumped before mining for the control of coal mine gas, and gas drainage is a permanent measure. my country's coal mine gas extraction rate is generally low. In addition to the influence of geological conditions such as poor coal seam permeability, the main reason is that the quality of the hole sealing of the borehole is poor, and the gap around the borehole cannot be effectively sealed. The gas concentration decays quickly and the gas flow rate is low. [0003] At present, domestic drilling and sealing methods include the following: polyurethane sealing, mechanical elastic sealing, inflatable sealing, hydraulic expansion sealing, new pressurized grouting sealing, etc. It is di...

AI Technical Summary

Problems solved by technology

It is difficult to evenly send polyurethane sealing fluid into the drill hole. The unit price of polyurethane sealing fluid is relatively high, and the amount used in the sealing process is relatively large, so the cost of sealing holes with this technology is relatively high

Mechanical elastic hole sealing and inflatable hole sealing methods have poor sealing performance and serious air leakage, and basically cannot be used for long-term drainage drilling in this coal seam.

The cost of the hydraulic expansion sealing method is relatively high, and the micro-leakage of the sealer cannot guarantee the effect of long-term sealing

When using cement slurry to seal the hole, because polyurethane sealing fluid is used to seal the gap between the two ends of the casing and the wall of the drilled hole, it also has the disadvantage of using polyurethane sealing fluid for hole sealing

Using the existing sealing device to seal the hole has the disadvantages of serious air leakage, poor quality, high cost and long sealing time.

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