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Secondary hole sealing device for firedamp taking-out discharging drilling

A secondary sealing and gas drainage technology, which is applied in the direction of gas discharge, safety devices, earthwork drilling, etc., can solve the problems of difficult gas drainage work and the decrease of gas drainage concentration, so as to achieve ideal sealing effect and improve The effect of drainage gas concentration and wide practicability

Active Publication Date: 2008-08-27
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After a period of drainage, due to the further development of cracks around the borehole, especially in the loose circle, under the influence of the negative pressure of the drainage, the concentration of the gas drainage will decrease, and even the concentration of the gas will be zero, which will bring a negative impact on the gas drainage work. great difficulty

Method used

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  • Secondary hole sealing device for firedamp taking-out discharging drilling

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Embodiment Construction

[0010] An example of the present invention will be further described below in conjunction with the accompanying drawings:

[0011] As shown in the drawings, the gas drainage drilling secondary sealing device of the present invention is composed of a main intake pipe 1, a control valve 2, a pressure reducing valve 3, and a feeding device 4. The control valve 2 and the pressure reducing valve 3 are arranged in sequence On the pipeline connecting the main air inlet pipe 1 and the feeding device 4, the feeding device 4 consists of a charging barrel 4-1, a blowing chamber 4-2 and an auxiliary air inlet chamber 4 arranged below the charging barrel 4-1. 3 composition, the bottom plate of the auxiliary air inlet chamber 4-3 is inclined to enhance the upward airflow. Between the blowing chamber 4-2 and the auxiliary air inlet chamber 4-3 is provided with a barrier breathable canvas 4-4, and the blowing chamber 4-2 is respectively provided with a blowing air inlet pipe 4-5 and a discharge p...

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Abstract

The invention relates to a secondary hole sealing device for gas drainage and drilling, consisting of a main air inlet pipe, a control valve, a relief valve and a feeding device, wherein, the main air inlet pipe is directly connected with the feeding device; the control valve and the relief valve are arranged on an inlet pipe of the feeding device in turn. High-pressure gas in a compressed air pipe is adopted as air sources; gas admission is controlled by the control valve; the pressure of inlet gas is reduced to proper pressure by the relief valve; secondary hole sealing materials are blown into a gas drainage drill hole with certain pressure through the feeding device; the drill hole is full of the hole sealing materials under the action of pressure and the hole sealing materials are permeated into cracks on the circumference of the drill hole, and then secondary hole sealing of the gas drainage drill hole is finished. The secondary hole sealing device has the advantages of simple operation, good hole sealing effect, light weight, convenient transportation, safety and reliability, and wide practicability.

Description

Technical field [0001] The invention relates to a hole sealing device, in particular to a secondary hole sealing device for gas drainage drilling. Background technique [0002] In coal mine gas drainage, the quality of drilling and sealing is a key factor for the drainage effect. Polyurethane sealing is widely used in coal mines due to its advantages of simple operation, fast speed, small labor, and good sealing effect. Polyurethane sealing is to wrap a sack sheet with polyurethane on the suction pipe at a certain distance (3~5m) from the orifice, and use the expansion effect of polyurethane to seal the hole. The sealing distance is 2~3m. The section avoids the loose ring, and the sealing effect is good. [0003] After the initial sealing is completed, gas drainage begins. When the drainage has been carried out for a period of time, due to the further development of the fissures around the borehole, especially within the range of the loose circle, under the influence of the negat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00
Inventor 周福宝张仁贵昃玺刘应科姜铁明王军
Owner CHINA UNIV OF MINING & TECH
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