Rapid sampling device for gas in closed wall for coal mine

Abstract

The utility model relates to the technical field of closed walls, in particular to a quick sampling device for gas in a coal mine closed wall, which comprises a closed wall and a pre-buried pipe, the inner end of the pre-buried pipe penetrates through the outer wall of the closed wall to be communicated with the inner side space of the closed wall, and the outer end of the pre-buried pipe is communicated with a sampling hole. An electromagnetic valve is arranged on the portion, located on the outer side of the sealing wall, of the embedded pipe. According to the utility model, the embedded pipe is embedded before the closed wall is closed, the embedded pipe is directly connected with the sampling hole, and the electromagnetic valve is arranged at the outer end of the embedded pipe, so that when sampling is needed, the electromagnetic valve is directly controlled by the control panel to be opened, and gas on the inner side of the closed wall can be sampled; detection personnel do not need to consume a large amount of time to exhaust gas in the observation pipe, the detection preparation time is greatly shortened, meanwhile, detection errors caused by factors such as air leakage of the observation pipe are avoided, and the efficiency and accuracy of detection work are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of airtight walls, in particular to a device for rapidly sampling gas inside a coal mine airtight wall. Background Art

[0002] If the gob is not tightly sealed, it will cause the ventilation air flow to be disordered, resulting in the leakage of gas and other toxic and harmful gases in the gob, and gas accumulation will occur. At the same time, the entry of fresh air into the gob may cause safety accidents such as spontaneous combustion of the residual coal in the gob and gas explosion. At present, the main method to isolate the gob is to build an airtight wall in the gob. In order to analyze and investigate the hidden dangers of harmful gases in the sealed gob and check the integrity of the airtight wall in the gob, it is necessary to regularly detect the pressure difference inside and outside the wall and sample and detect the gas in the gob.

[0003] At present, when sampling the gas in the gob, it is necessary to first open the gate valve to evacuate the gas in the observation pipe, and then a sample of the real air inside the airtight wall can be sampled. When sampling, the sampling hose is inserted into the observation pipe, and the observation pipe orifice is blocked by hand, and then the gate valve of the observation pipe is opened, so as to sample the gas in the gob. In this way, not only a lot of time is wasted in evacuating the gas in the observation pipe, but also the influence of factors such as air leakage will occur when blocking the observation pipe by hand, resulting in inaccurate detection.

[0004] Based on the above reasons, the utility model provides a device for rapidly sampling gas inside a coal mine airtight wall. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a device for rapidly sampling gas inside a coal mine airtight wall. By pre-burying a pre-buried pipe before the airtight wall is sealed, the pre-buried pipe is directly connected to the sampling hole, and an electromagnetic valve is installed at the outer end of the pre-buried pipe. When sampling is required, the electromagnetic valve can be directly controlled to open through the control panel to sample the gas inside the airtight wall. The detection personnel no longer need to spend a lot of time exhausting the gas in the observation pipe, and the detection preparation time is greatly reduced. At the same time, the detection error caused by factors such as air leakage in the observation pipe is avoided, and the efficiency and accuracy of the detection work are greatly improved.

[0006] In order to achieve the purpose of the utility model, the technical scheme adopted by the utility model is as follows:

[0007] The utility model discloses a device for rapidly sampling gas inside a coal mine airtight wall, which includes an airtight wall and a pre-buried pipe. The inner end of the pre-buried pipe passes through the outer wall of the airtight wall and communicates with the inner space thereof. The outer end of the pre-buried pipe communicates with the sampling hole, and an electromagnetic valve is provided on the part of the pre-buried pipe located outside the airtight wall.

[0008] An observation pipe is provided on the airtight wall, and the inner end of the observation pipe passes through the airtight wall and communicates with the inner space thereof; a U-shaped differential pressure gauge is hung on the outer wall of the airtight wall. The U-shaped differential pressure gauge includes a U-shaped tube, scale lines and a hose. Openings are formed at the two top ends of the U-shaped tube. The fixed end of the hose communicates with one opening of the U-shaped tube, and the free end of the hose can communicate with the observation pipe; scale lines are provided on the outer wall of the U-shaped differential pressure gauge along its height direction.

[0009] External threads are provided on the outer wall of the outer end of the observation pipe; the free end of the hose is connected to a connector. The connector is a hollow cylindrical structure with an opening at the inner end, and internal threads matching the external threads on the outer wall of the observation pipe are provided on its inner wall; a through hole communicating with the free end of the hose is provided axially on the connector.

[0010] The inner diameter of the through hole is equal to the outer diameter of the hose.

[0011] A spare pipe is connected to the bottom of the outer end of the observation pipe. The top end of the spare pipe communicates with the inner cavity of the observation pipe. External threads are provided on the outer wall of the outer end of the spare pipe; gate valves are provided at the outer ends of both the observation pipe and the spare pipe.

[0012] The airtight wall includes a first wall body, a second wall body, connecting ribs and a filling wall. The first wall body is fixed on the outer side of the roadway, the second wall body is fixed on the inner side of the roadway, and the connecting ribs are connected between the two inner sides of the inner walls of the first wall body and the second wall body. A square cavity is formed between the first wall body, the second wall body and the inner wall of the roadway. Grouting holes for communicating with the square cavity are provided on the outer wall of the first wall body, and the filling wall is formed by grouting in the square cavity through the grouting holes.

[0013] The heights of the first wall body and the second wall body are greater than the height of the inner cavity of the roadway; grooves for masonry of the top ends and bottom ends of the first wall body and the second wall body are provided at the top and bottom of the roadway.

[0014] The beneficial effects of the present utility model are as follows:

[0015] By pre-burying a pre-buried pipe before the airtight wall is closed, connecting the pre-buried pipe directly to the sampling hole, and installing a solenoid valve at the outer end of the pre-buried pipe, when sampling is required, the solenoid valve can be directly controlled to open through the control panel to sample the gas inside the airtight wall. The detection personnel no longer need to spend a lot of time exhausting the gas in the observation pipe, the detection preparation time is greatly reduced, and at the same time, the detection error caused by factors such as air leakage in the observation pipe is avoided, the efficiency and accuracy of the detection work are greatly improved, the phenomenon of slow traditional sampling is effectively changed, and a strong guarantee is provided for the safety management of mine fire prevention and extinguishment. Comprehensively promoting and applying this technology can continuously improve the safety detection efficiency and contribute the "ventilation" force to the safe and stable development of the mine;

[0016] The utility model connects the fixed end of the hose with one end of the U-shaped tube, and the free end of the hose is hermetically connected to the outer end of the observation tube through a connector, which can avoid the measurement error caused by factors such as air leakage in the observation tube when measuring the pressure difference between the inside and outside of the airtight wall through a U-shaped differential pressure gauge. Moreover, during the detection, the staff is also more relaxed and does not need to block the observation tube opening by hand. Description of the Drawings

[0017] Figure 1 is a partial structural schematic diagram of the utility model;

[0018] Figure 2 is a sectional schematic diagram of the utility model;

[0019] Figure 3 is Figure 2 a partial enlarged view of

[0020] In the figure: 1 airtight wall, 2 embedded pipe, 3 solenoid valve, 4 observation tube, 5 U-shaped differential pressure gauge, 6 connector, 7 spare pipe, 8 roadway, 9 groove, 11 first wall, 12 second wall, 13 connecting rib, 14 filling wall, 51 U-shaped tube, 52 scale line, 53 hose, 61 through hole. Detailed Embodiment

[0021] The following further explains the utility model:

[0022] Please refer to Figures 1-3 ,

[0023] The utility model discloses a device for quickly sampling gas inside a coal mine airtight wall, which includes an airtight wall 1 and an embedded pipe 2. The inner end of the embedded pipe 2 passes through the outer wall of the airtight wall 1 and communicates with its inner space. The outer end of the embedded pipe 2 is communicated with a sampling hole. An electromagnetic valve 3 is provided on the part of the embedded pipe 2 outside the airtight wall 1. In this case, the embedded pipe 2 is pre-buried before the airtight wall 1 is closed, the embedded pipe 2 is directly connected to the sampling hole, and an electromagnetic valve 3 is installed at the outer end of the embedded pipe 2. When sampling is required, the electromagnetic valve 3 can be directly controlled to open through a control panel to sample the gas inside the airtight wall 1. The detection personnel do not need to spend a lot of time exhausting the gas in the observation tube, the detection preparation time is greatly reduced, and at the same time, the detection error caused by factors such as air leakage in the observation tube is avoided, the efficiency and accuracy of the detection work are greatly improved, the phenomenon of slow traditional sampling is effectively changed, and a strong guarantee is provided for the safety management of mine fire prevention and extinguishing. The full promotion and application of this technology can continuously improve the safety detection efficiency and contribute the "ventilation" force to the safe and stable development of the mine.

[0024] Furthermore, an observation pipe 4 is provided on the airtight wall 1, and the inner end of the observation pipe 4 passes through the airtight wall 1 and communicates with the inner space thereof; a U-shaped differential pressure gauge 5 is hung on the outer wall of the airtight wall 1. The U-shaped differential pressure gauge 5 includes a U-shaped pipe 51, scale lines 52 and a flexible hose 53. Openings are formed at the two top ends of the U-shaped pipe 51. The fixed end of the flexible hose 53 communicates with one opening of the U-shaped pipe 51, and the free end of the flexible hose 53 can communicate with the observation pipe 4; the scale lines 52 are provided on the outer wall of the U-shaped differential pressure gauge 5 along its height direction; external threads are provided on the outer wall of the outer end of the observation pipe 4; the free end of the flexible hose 53 is connected to a connector 6. The connector 6 has a hollow cylindrical structure with an inner opening, and internal threads matching the external threads on the outer wall of the observation pipe 4 are provided on its inner wall; a through hole 61 communicating with the free end of the flexible hose 53 is provided axially on the connector 6. By connecting the fixed end of the flexible hose 53 to one end of the U-shaped pipe 51 and sealingly connecting the free end of the flexible hose 53 to the outer end of the observation pipe 4 through the connector 6, it can be avoided that when measuring the differential pressure between the inside and outside of the airtight wall 1 through the U-shaped differential pressure gauge 5, measurement errors caused by factors such as air leakage from the observation pipe 4 do not occur, and during detection, the staff is also more relaxed and does not need to block the observation pipe opening by hand.

[0025] Furthermore, the inner diameter of the through hole 61 is equal to the outer diameter of the flexible hose 53, ensuring a tighter connection between the flexible hose 53 and the connector 6 and preventing air leakage.

[0026] Furthermore, a spare pipe 7 is connected to the bottom of the outer end of the observation pipe 4. The top end of the spare pipe 7 communicates with the inner cavity of the observation pipe 4, and external threads are provided on the outer wall of the outer end of the spare pipe 7; gate valves are provided at the outer ends of both the observation pipe 4 and the spare pipe 7. By providing the spare pipe 7, it can be used to connect to the connector 6 for detecting the pressure difference when the outer end of the observation pipe 4 is blocked or cannot be connected to the connector 6 for other reasons. At the same time, if other data need to be measured, it can be connected through the spare pipe 7, thus eliminating the need to disassemble the connector 6 from the observation pipe 4.

[0027] Furthermore, the airtight wall 1 includes a first wall body 11, a second wall body 12, connecting ribs 13 and a filling wall 14. The first wall body 11 is fixed on the outer side of the roadway 8, and the second wall body 12 is fixed on the inner side of the roadway 8. The connecting ribs 13 are connected between the inner walls on both sides of the first wall body 11 and the second wall body 12. A square cavity is formed between the first wall body 11, the second wall body 12 and the inner wall of the roadway 8. A grouting hole for communicating with the square cavity is provided on the outer wall of the first wall body 11. The filling wall 14 is formed by grouting in the square cavity through the grouting hole. By providing the connecting ribs 13, the connection strength between the first wall body 11 and the second wall body 12 is improved, especially the strength during grouting.

[0028] Furthermore, the heights of the first wall 11 and the second wall 12 are greater than the height of the inner cavity of the roadway 8; grooves 9 for masonry of the top and bottom ends of the first wall 11 and the second wall 12 are provided at the top and bottom of the roadway 8. By providing the grooves 9, the support strength of the airtight wall 1 can be improved, making the airtight wall 1 more stable.

[0029] The above are only the embodiments of the present invention, and do not thus limit the patent scope of the present invention. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or any direct or indirect application in related technical fields, shall similarly be included within the patent protection scope of the present invention.

Claims

1. A device for quickly sampling gases inside a sealed wall in a coal mine, characterized in that: It includes an airtight wall (1) and a pre-embedded pipe (2). The inner end of the pre-embedded pipe (2) passes through the outer wall of the airtight wall (1) and communicates with its inner space. The outer end of the pre-embedded pipe (2) is communicated with a sampling hole. An electromagnetic valve (3) is provided on the part of the pre-embedded pipe (2) located outside the airtight wall (1).

2. The rapid gas sampling device in the airtight wall for coal mines according to claim 1, wherein: An observation pipe (4) is provided on the airtight wall (1). The inner end of the observation pipe (4) passes through the airtight wall (1) and communicates with its inner space. A U-shaped differential pressure gauge (5) is hung on the outer wall of the airtight wall (1). The U-shaped differential pressure gauge (5) includes a U-shaped pipe (51), scale lines (52) and a hose (53). Openings are formed at the two top ends of the U-shaped pipe (51). The fixed end of the hose (53) is communicated with one opening of the U-shaped pipe (51). The free end of the hose (53) can be communicated with the observation pipe (4). The scale lines (52) are provided on the outer wall of the U-shaped differential pressure gauge (5) along its height direction.

3. The rapid gas sampling device for the airtight wall in coal mines according to claim 2, characterized in that: External threads are provided on the outer wall of the outer end of the observation pipe (4). The free end of the hose (53) is connected to a connector (6). The connector (6) is a hollow cylindrical structure with an inner end opening. Internal threads matching the external threads on the outer wall of the observation pipe (4) are provided on its inner wall. A through hole (61) communicating with the free end of the hose (53) is axially provided on the connector (6).

4. A rapid gas sampling device inside a sealed wall for coal mines according to claim 3, characterized in that: The inner diameter of the through hole (61) is equal to the outer diameter of the hose (53).

5. The rapid gas sampling device in a sealed wall for coal mines according to claim 2, wherein: A spare pipe (7) is connected to the bottom of the outer end of the observation pipe (4). The top end of the spare pipe (7) is communicated with the inner cavity of the observation pipe (4). External threads are provided on the outer wall of the outer end of the spare pipe (7). Gate valves are provided at the outer ends of the observation pipe (4) and the spare pipe (7).

6. The rapid gas sampling device inside the airtight wall for coal mines according to claim 1, wherein: The airtight wall (1) includes a first wall body (11), a second wall body (12), connecting ribs (13) and a filling wall (14). The first wall body (11) is fixed on the outer side of the roadway (8). The second wall body (12) is fixed on the inner side of the roadway (8). The connecting ribs (13) are connected between the two inner walls of the first wall body (11) and the second wall body (12). A square cavity is formed between the first wall body (11), the second wall body (12) and the inner wall of the roadway (8). A grouting hole for communicating with the square cavity is provided on the outer wall of the first wall body (11). The filling wall (14) is formed by grouting through the grouting hole in the square cavity.

7. A rapid gas sampling device inside a sealed wall for coal mines according to claim 6, characterized in that: The heights of the first wall body (11) and the second wall body (12) are greater than the inner cavity height of the roadway (8). Grooves (9) for masonry of the top ends and bottom ends of the first wall body (11) and the second wall body (12) are provided at the top and bottom of the roadway (8).

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