Working face air return corner gas anti-overrun active plugging and pumping promoting device

Abstract

The utility model discloses a working face air return corner gas anti-overrun active plugging extraction promoting device which comprises a gas extraction pipeline, and a pipe body of the gas extraction pipeline is connected with an extraction unit and the gas extraction pipeline. The device further comprises a plugging unit which is connected with a gas injection pipeline, the end, away from the plugging unit, of the gas injection pipeline is connected with a compressed air pipeline, and the extraction unit and the gas injection pipeline are arranged on the two sides of the plugging unit respectively. A large amount of gas gushing out of the goaf is blocked and pumped through the synergistic effect of all the parts, and after the sensor transmits signals, the controller controls the opening degree of the butterfly valve of the extraction pipeline, further controls the negative pressure and controls the pressure air switch to inflate the air bag to form an air wall to block the air return corner.

Description

Technical Field

[0001] The utility model belongs to the technical field of mine gas prevention and control equipment, and specifically relates to a working face return air corner gas over-limit prevention active blocking and extraction promotion device. Background Art

[0002] In recent years, gas disasters still account for a large proportion of coal mine accidents. Gas exceeding the limit is one of the main causes of coal mine gas accidents and endangers the lives of underground workers. If it is not handled in time or improperly, it is easy to cause gas accidents. According to ventilation theory, when the "U"-shaped ventilation is adopted in the recovery working face of a high-gas mine, the wind flow enters the return air tunnel and the goaf. Under the action of the wind flow, the gas and air in the goaf will mix and flow toward the return air chute. Due to the shape of the goaf and the dynamics of the wind flow, a vortex area will be formed at the return air corner of the working face. The vortex is formed by the rotation of the wind flow in space, and this rotation can cause gas to accumulate in this area. Due to the action of the vortex, the gas in the goaf is taken out and may accumulate at the return air corner. The gas concentration in this area may increase due to the continuous action of the vortex, thereby increasing the risk of gas exceeding the limit.

[0003] The instability of the goaf may lead to air leakage, that is, the airflow enters the goaf through loose gaps, which will further increase the gas concentration in the goaf and aggravate the gas accumulation problem in the return air corner. At present, the method of gas control in the return air corner is mostly to use buried pipe extraction, which generally adopts low negative pressure extraction, and it is impossible to control the sudden outflow of large amounts of gas in time. Utility Model Content

[0004] The utility model aims to provide a working face return air corner gas over-limit prevention active blocking and extraction promoting device, which can block and promote the extraction of a large amount of gas gushing out of the goaf.

[0005] The technical solution adopted by the utility model is an active plugging and extraction-promoting device for preventing gas from exceeding the limit in the return air corner of the working face, comprising a gas extraction pipeline, the pipe body of the gas extraction pipeline is connected with an extraction unit, the gas extraction pipeline also comprises a plugging unit, the plugging unit is connected with an air injection pipeline, the end of the air injection pipeline away from the plugging unit is connected with a compressed air pipeline, and the extraction unit and the air injection pipeline are respectively arranged on both sides of the plugging unit.

[0006] The utility model is also characterized in that:

[0007] It also includes a controller, which is connected to a first pneumatic butterfly valve and a second pneumatic butterfly valve through pipelines. The second pneumatic butterfly valve is connected to the pipe body of the gas extraction pipeline, and the first starting butterfly valve is connected to the pipe body of the compressed air pipeline. The controller is also connected to a monitoring unit through pipelines.

[0008] The monitoring unit includes a T0 methane sensor, which is connected to the controller through a pipeline and is arranged close to the plugging unit.

[0009] The extraction unit comprises a plurality of evenly arranged screen tubes, one end of which is connected to the pipe body of the gas extraction pipeline through a tee, and a wood pile is arranged around the outer wall of the screen tube.

[0010] The plugging unit includes a plugging airbag, which is arranged near the T0 methane sensor. The plugging airbag is provided with an airbag air inlet hole, which is connected to the air injection pipeline. The air injection pipeline and the screen tube are respectively arranged on both sides of the plugging airbag.

[0011] The plugging airbag is connected with a pressure relief valve, the outer wall of the plugging airbag is surrounded by a geotextile, the space between the geotextile and the plugging airbag is filled with flame retardant material, and the air injection pipeline passes through the geotextile and the flame retardant material and is connected with the air inlet hole of the airbag.

[0012] The beneficial effects of the utility model are:

[0013] The active blocking and extraction promotion device for preventing gas over-limit in the return air corner of the working face can block and promote the extraction of a large amount of gas gushing out of the goaf through the coordinated action of each part. After the sensor transmits the signal, the controller controls the opening of the butterfly valve in the extraction pipeline and then controls the size of the negative pressure and controls the compressed air switch to inflate the air bag to form an air wall to block the return air corner. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a plan view of the utility model of the working face return air corner gas over-limit prevention active blocking and extraction promoting device;

[0015] Figure 2 It is a cross-sectional view of the working face return air corner gas over-limit prevention active blocking and extraction promoting device in the utility model, in which the blocking air bag is not propped up;

[0016] Figure 3 It is a cross-sectional view of the propped-up state of the blocking airbag in the active blocking and extraction-promoting device for preventing over-limit gas in the return air corner of the working face of the utility model;

[0017] Figure 4 It is a front view of the blocking airbag in the working face return air corner gas overlimit prevention active blocking and extraction promoting device of the utility model;

[0018] Figure 5 It is a side view of the blocking airbag in the working face return air corner gas overlimit prevention active blocking and extraction promoting device of the utility model;

[0019] Figure 6 The utility model is a top view of a blocking air bag in a working face return air corner gas over-limit prevention active blocking and extraction promoting device.

[0020] In the figure: 1. gas extraction pipeline, 1-1. screen pipe, 1-2. wood pile, 2. T0 methane sensor, 3. controller, 3-1. first pneumatic butterfly valve, 3-2. second pneumatic butterfly valve, 4. goaf, 5. bottom plate of return air lane of working face, 6. sealing air bag, 6-1. air inlet hole of air bag, 6-2. pressure relief valve, 6-3. flame retardant material, 6-4. geotextile, 7. gas injection pipeline, 8. working face support, 9. compressed air pipeline, 10. return air chute of working face. DETAILED DESCRIPTION

[0021] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0022] The utility model provides a working face return air corner gas over-limit prevention active blocking and extraction promoting device, such as Figure 1 As shown, it includes a gas extraction pipeline 1, the pipe body of the gas extraction pipeline 1 is connected to a extraction unit, the gas extraction pipeline 1 also includes a plugging unit, the plugging unit is connected to a gas injection pipeline 7, the end of the gas injection pipeline 7 away from the plugging unit is connected to a compressed air pipeline 9, and the extraction unit and the gas injection pipeline 7 are respectively arranged on both sides of the plugging unit. In view of the problem that when the high-gas mine mining face adopts "U" ventilation, the gas in the goaf 4 is brought to the return air corner by the wind flow, causing the corner gas to exceed the limit, a gas extraction pipeline 1 is installed at the left coal seam of the return air chute 11 of the mining face. The gas extraction pipeline 1 is a thin-walled steel pipe with a diameter of 400mm. The gas extraction pipeline 1 is laid on the bottom plate 5 of the return air lane of the working face. The return air corner of the working face is buried for gas extraction. The part of the gas extraction pipeline 1 connected to the extraction unit extends into the goaf 4. The plugging unit is set at the exit of the goaf 4 below the working face support 8 to plug the goaf 4 and prevent the gas from accumulating in the return air corner. The gas extraction pipeline 1 extracts the gas in the goaf 4 through the extraction unit.

[0023] Example 1

[0024] Active blocking and extraction-promoting device for preventing over-limit gas in the return air corner of the working face, such as Figure 1 As shown, it includes a gas extraction pipeline 1, a pipe body of the gas extraction pipeline 1 is connected with an extraction unit, and the gas extraction pipeline 1;

[0025] It also includes a plugging unit, which is connected to an air injection pipeline 7. One end of the air injection pipeline 7 away from the plugging unit is connected to a compressed air pipeline 9. The extraction unit and the air injection pipeline 7 are respectively arranged on both sides of the plugging unit.

[0026] like Figure 2-3As shown, the controller 3 is also included. The controller 3 is connected to the first pneumatic butterfly valve 3-1 and the second pneumatic butterfly valve 3-2 through pipelines. The second pneumatic butterfly valve 3-2 is connected to the pipe body of the gas extraction pipeline 1, and the first start butterfly valve 3-1 is connected to the pipe body of the compressed air pipeline 9. The controller 3 is also connected to a monitoring unit through a pipeline. The monitoring unit is set at the return air corner position to detect the gas concentration. When the gas outflow in the goaf 4 is large, the monitoring unit transmits the signal of the gas concentration to the controller 3. The controller 3 controls the first pneumatic butterfly valve 3-1 and the second pneumatic butterfly valve 3-2 to open, and the plugging unit expands and plugs. At the same time, the gas extraction pipeline 1 promotes the gas extraction in the goaf 4 by increasing the extraction negative pressure of the extraction unit.

[0027] The monitoring unit includes a T0 methane sensor 2, which is connected to the controller 3 through a pipeline and is arranged close to the plugging unit. The T0 methane sensor 2 serves as a gas detection part to monitor the gas concentration in the return air corner.

[0028] Example 2

[0029] Active blocking and extraction-promoting device for preventing over-limit gas in the return air corner of the working face, such as Figure 1 As shown, it includes a gas extraction pipeline 1, a pipe body of the gas extraction pipeline 1 is connected with an extraction unit, and the gas extraction pipeline 1;

[0030] It also includes a plugging unit, which is connected to an air injection pipeline 7. One end of the air injection pipeline 7 away from the plugging unit is connected to a compressed air pipeline 9. The extraction unit and the air injection pipeline 7 are respectively arranged on both sides of the plugging unit.

[0031] The extraction unit includes a number of evenly arranged screens 1-1, one end of which is connected to the pipe body of the gas extraction pipeline 1 through a tee, and a wood pile 1-2 is arranged around the outer wall of the screen 1-1. The screen 1-1 is a screen with holes, which is convenient for extraction. The gas extraction pipeline 1 buried in the goaf 4 has a screen 1-1 with holes, and the axis of the screen 1-1 with holes is perpendicular to the ground. Wood piles 1-2 are set up around the screen 1-1 to protect it and prevent coal slag from falling and damaging the pipeline. When the buried pipe in the goaf reaches 15m, the gas extraction pipeline 1 with the second gas-controlled butterfly valve 3-2 is subsequently connected, and then the process of connecting the pipeline is analogous to each cycle of pressure on the working face.

[0032] Example 3

[0033] Active blocking and extraction-promoting device for preventing over-limit gas in the return air corner of the working face, such as Figure 1 As shown, it includes a gas extraction pipeline 1, a pipe body of the gas extraction pipeline 1 is connected with an extraction unit, and the gas extraction pipeline 1;

[0034] It also includes a plugging unit, which is connected to an air injection pipeline 7. One end of the air injection pipeline 7 away from the plugging unit is connected to a compressed air pipeline 9. The extraction unit and the air injection pipeline 7 are respectively arranged on both sides of the plugging unit.

[0035] like Figure 4-6 As shown, the plugging unit includes a plugging airbag 6, which is arranged near the T0 methane sensor 2. The plugging airbag 6 is provided with an airbag air inlet hole 6-1, which is connected to the air injection pipeline 7. The air injection pipeline 7 and the screen tube 1-1 are respectively arranged on both sides of the plugging airbag 6. The plugging airbag 6 is a compressible airbag. Under normal working conditions, the plugging airbag 6 is slightly inflated to perform plugging. When the gas outflow in the goaf 4 is large, the controller 3 controls the first pneumatic butterfly valve 3-1 to open, and the compressed air pipeline 9 injects air into the plugging airbag 6 through the air injection pipeline 7, and the plugging airbag 6 expands rapidly to plug the goaf.

[0036] The plugging airbag 6 is connected to a pressure relief valve 6-2. A geotextile 6-4 is arranged around the outer wall of the plugging airbag 6. A flame retardant material 6-3 is filled between the geotextile 6-4 and the plugging airbag 6. The air injection pipeline 7 passes through the geotextile 6-4 and the flame retardant material 6-3 and is connected to the airbag air inlet 6-1. Both the flame retardant material 6-3 and the geotextile 6-4 are elastic. When the extraction operation is completed, the pressure can be released through the pressure relief valve 6-2.

[0037] The working principle of the utility model of the working face return air corner gas over-limit prevention active blocking and extraction promotion device is as follows:

[0038] The T0 methane sensor 2 is suspended at the return air corner to detect the gas concentration. When the gas outflow from the goaf 4 is large, the T0 methane sensor 2 transmits the signal of the monitored gas concentration to the controller 3. The controller 3 controls the first pneumatic butterfly valve 3-1 and the second pneumatic butterfly valve 3-2 to open. The compressed air pipeline 9 injects gas into the blocking airbag 6 through the gas injection pipeline 7. The blocking airbag 6 expands rapidly to block the goaf. The extraction pipeline 1 promotes the gas extraction in the goaf 4. In this way, the problem of gas exceeding the limit can be solved from the window period.

[0039] The utility model discloses an active blocking and extraction promoting device for preventing gas over-limit in the return air corner of the working face. Through the coordinated action of each part, a large amount of gas gushing out from the goaf is blocked and extracted. After the sensor transmits a signal, the controller controls the opening of the butterfly valve of the extraction pipeline and thus controls the size of the negative pressure and controls the compressed air switch to inflate the air bag to form an air wall to block the return air corner.

Claims

1. The working face return air corner gas over-limit prevention active blocking and extraction promotion device is characterized by: The gas extraction pipeline (1) comprises a gas extraction pipeline (1), the pipe body of the gas extraction pipeline (1) being connected to an extraction unit, the gas extraction pipeline (1) further comprising a plugging unit, the plugging unit being connected to an air injection pipeline (7), the end of the air injection pipeline (7) being remote from the plugging unit being connected to a compressed air pipeline (9), the extraction unit and the air injection pipeline (7) being respectively arranged on both sides of the plugging unit; The system further comprises a controller (3), wherein the controller (3) is connected to a first pneumatic butterfly valve (3-1) and a second pneumatic butterfly valve (3-2) via pipelines, the second pneumatic butterfly valve (3-2) is connected to the pipe body of the gas extraction pipeline (1), the first pneumatic butterfly valve (3-1) is connected to the pipe body of the compressed air pipeline (9), and the controller (3) is also connected to a monitoring unit via pipelines.

2. The working face return air corner gas over-limit prevention active blocking and extraction facilitation device according to claim 1 is characterized in that: The monitoring unit comprises a T0 methane sensor (2), the T0 methane sensor (2) being connected to a controller (3) via a pipeline, and the T0 methane sensor (2) being arranged close to the plugging unit.

3. The working face return air corner gas over-limit prevention active blocking and extraction facilitation device according to claim 1 is characterized in that: The extraction unit comprises a plurality of evenly arranged screen tubes (1-1), one end of the screen tube (1-1) being connected to the pipe body of the gas extraction pipeline (1) via a tee, and a wood pile (1-2) being arranged around the outer wall of the screen tube (1-1).

4. The working face return air corner gas over-limit prevention active blocking and extraction facilitation device according to claim 2 is characterized in that: The blocking unit comprises a blocking airbag (6), the blocking airbag (6) being arranged close to the T0 methane sensor (2), the blocking airbag (6) being provided with an airbag air inlet hole (6-1), the airbag air inlet hole (6-1) being connected to an air injection pipeline (7), and the air injection pipeline (7) and the screen tube (1-1) being arranged on both sides of the blocking airbag (6), respectively.

5. The working face return air corner gas over-limit prevention active blocking and extraction facilitation device according to claim 4 is characterized in that: The blocking airbag (6) is connected to a pressure relief valve (6-2); a geotextile (6-4) is provided around the outer wall of the blocking airbag (6); a flame retardant material (6-3) is filled between the geotextile (6-4) and the blocking airbag (6); and the air injection pipeline (7) passes through the geotextile (6-4) and the flame retardant material (6-3) and is connected to the airbag air inlet hole (6-1).

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