Movable gas collection device and method for goaf residual coal spontaneous combustion dangerous area

Abstract

The invention discloses a movable gas collecting device and method for a goaf residual coal spontaneous combustion dangerous area, and relates to the technical field of mine ventilation and safety, the collecting device comprises a beam tube, an extraction valve, an annular gas bag and an inflation valve, one end of the beam tube is a sealed end, the beam tube is arranged in a protection steel tube in a penetrating mode, and a plurality of circulation openings are formed in the protection steel tube; the two ends of the beam tube are connected with traction mechanisms, and the open end of the beam tube communicates with an air pump. An extraction opening is formed in the beam tube, the extraction valve is communicated with the extraction opening, and the extraction valve is a one-way valve; the annular air bags are arranged on the two sides of the extraction valve, and the annular air bags are arranged between the beam tube and the protection steel tube; an air escape valve is mounted on the annular air bag; the inflation valve is arranged in the annular air bag, and the annular air bag is communicated with the beam tube through the inflation valve; the inflation valve is a one-way valve. The gas at different sampling points in the goaf is collected by manually moving the collecting device in the roadway, laying of protective steel pipes and beam pipes is reduced, and a large amount of project investment is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of mine ventilation and safety, and particularly relates to a gas mobile collection device and method for the spontaneous combustion dangerous area of residual coal in the goaf. Background Art

[0002] Coal is the main energy source in China. The spontaneous combustion of residual coal in the goaf of coal mines is one of the major natural disasters threatening the safe production of mines. In recent years, with the increase in coal mining depth, mining intensity and scale, the high geothermal temperature has made the problem of coal spontaneous combustion disasters increasingly serious, posing a serious threat to the safe production of coal mines. The observation of the "three zones" (heat dissipation zone, oxidation zone and asphyxiation zone) in the goaf is an important means to divide the spontaneous combustion dangerous area of residual coal in the goaf, and its main division index is the oxygen concentration inside the goaf.

[0003] The traditional test method for the "three zones" distribution is mainly to lay bunch tubes and protection steel pipes in the intake airway and return airway, and gradually penetrate into the goaf of the "two roadways" as the working face advances. However, there is less analysis of the "three zones" distribution in the middle area of the goaf. Even if bunch tubes and protection steel pipes are laid in the open-off cut, the area range of gas that can be collected by the existing equipment and technology depends on the position of the sampling points left during the previous laying of the protection steel pipes. Each sampling point needs to be connected to the bunch tube and gas is collected separately. As the number of sampling points left increases, the number of bunch tubes to be connected will also increase accordingly, and higher requirements are also put forward for the size and compressive strength of the protection steel pipes.

[0004] Therefore, there is an urgent need to provide a gas mobile collection device for the spontaneous combustion dangerous area of residual coal in the goaf to solve the technical problems existing in the above-mentioned prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a gas mobile collection device and method for the spontaneous combustion dangerous area of residual coal in the goaf to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above purpose, the present invention provides a gas mobile collection device for the spontaneous combustion dangerous area of residual coal in the goaf, including:

[0007] A bunch tube, one end of the bunch tube is a sealed end, the bunch tube is arranged inside the protection steel pipe, and a plurality of circulation ports are opened on the protection steel pipe; both ends of the bunch tube are connected with traction mechanisms, and the open end of the bunch tube is communicated with an air pump;

[0008] An air extraction valve, an air extraction port is opened on the bunch tube, the air extraction valve is communicated with the air extraction port, and the air extraction valve is a one-way valve;

[0009] An annular air bag, the annular air bag is arranged on both sides of the air extraction valve, and the annular air bag is arranged between the bunch tube and the protection steel pipe; a deflation valve is installed on the annular air bag;

[0010] An inflation valve is provided inside the annular airbag. The annular airbag is communicated with the bundle tube through the inflation valve; the inflation valve is a one-way valve.

[0011] Preferably, the traction mechanism includes two cable winders, which are respectively arranged in two roadways; a base is provided at the sealed end of the bundle tube, and U-shaped chucks are provided on both the base and the bundle tube. A cable on one cable winder is connected to the U-shaped chuck on the base, and a cable on the other cable winder is connected to the U-shaped chuck on the bundle tube; the two cable winders synchronously and reversely adjust the winding and unwinding of the cables.

[0012] Preferably, a bundle tube winder is arranged in the roadway where the air pump is located. The bundle tube winder is used to collect and arrange the bundle tube, and the bundle tube winder and the cable winder in the same roadway are adjusted synchronously and in the same direction.

[0013] Preferably, an annular iron sheet is connected to the annular airbag. The annular iron sheet is sleeved on the bundle tube, and the deflation valve is installed on the annular airbag through the annular iron sheet.

[0014] Preferably, the deflation valve includes a metal base, which is installed on the annular iron sheet. A shell is installed on the side of the metal base away from the annular iron sheet. A buffer and a permanent magnet are arranged inside the shell, and the permanent magnet is installed on the metal base through the buffer; a deflation channel is provided on the metal base, and the gas in the annular airbag enters the shell of the deflation valve through the deflation channel; a deflation port is provided on the shell.

[0015] Preferably, a base rubber pad is arranged between the metal base and the shell, and magnet rubber pads are installed at both ends of the permanent magnet.

[0016] Preferably, the cable is marked with an identifier, which is used to obtain the position information of the acquisition device inside the protection steel pipe.

[0017] Preferably, a protective cover is arranged outside the circulation port of the protection steel pipe. An air intake port is arranged on the protective cover, and the circulation port and the air intake port are not arranged corresponding to each other.

[0018] Preferably, a fixed pulley is installed inside the elbow at the turning of the protection steel pipe.

[0019] A method for mobile collection of gas in a goaf spontaneous combustion dangerous area specifically includes the following steps:

[0020] Step 1: According to the identifiers of the cable and the bundle tube, adjust the cable winder and the bundle tube winder so that the acquisition device reaches the position of the sampling point to be sampled.

[0021] Step 2: Conduct the first-stage pumping operation using an air pump. Under the action of positive gas pressure, the air extraction valve is in the closed state, and the inflation valve inside the annular airbag is in the open state. Gas accumulates in the annular airbag, and the annular airbag bulges until it is in close contact with the protective steel pipe. At this time, the air release valve is in the closed state. Stop the first-stage pumping operation of the air pump. Since no positive gas pressure is generated, the inflation valve switches to the closed state.

[0022] Step 3: Convert the air pump to the air extraction state. The inflation valve is in the closed state. Under the action of negative gas pressure, the air extraction valve opens, and the gas at the sampling point enters the bundle tube through the gas extraction port, the circulation port, and the air extraction valve to complete the collection operation. Stop the air extraction operation of the air pump. Since no negative gas pressure is generated, the air extraction valve switches to the closed state.

[0023] Step 4: Convert the air pump to the pumping state and conduct the second-stage pumping operation. The pressure of the second-stage pumping operation of the air pump is greater than that of the first-stage pumping operation. The inflation valve switches to the open state, and the air extraction valve remains in the closed state. As gas accumulates in the annular airbag, the air release valve opens, and the gas in the annular airbag enters the air release valve and is depressurized through the air release port.

[0024] Step 5: Stop the second-stage pumping operation of the air pump. The air pump is in the stopped state, and no positive gas pressure is generated. The inflation valve switches to the closed state. The gas in the annular airbag is depressurized through the air release valve until the positive pressure of the gas in the annular airbag gradually drops to zero. The permanent magnet returns to the nearest point under the action of the damping force and the magnetic force, and the air release valve returns to the closed state. The close contact state between the annular airbag and the protective steel pipe is destroyed.

[0025] Step 6: Adjust the cable reelers and the bundle tube reelers in the two roadways, move the collection device through the cable, and control the moving distance of the collection device according to the cable identification until it reaches the next sampling point to be sampled.

[0026] Compared with the prior art, the present invention has the following advantages and technical effects:

[0027] The gas mobile collection device for the spontaneous combustion danger area of residual coal in the goaf provided by the present invention can make the annular airbag be in close contact with the protection steel pipe, avoiding the pollution of the gas at the sampling point collected by the gas in the collection steel pipe; by manually moving the position of the collection device in the roadway, the gas at different sampling points in the goaf is collected, reducing the number of laid bundle tubes and protection steel pipes. The device has a simple structure and is convenient to use, can increase the freedom of gas collection at the sampling point, saves the upfront investment in the "three zones" measurement work, and saves construction time; by collecting the gas at the open-off cut position, the "three zones" distribution in the middle area of the goaf is clarified, increasing the freedom of goaf sampling. The present invention has a low investment cost, is convenient to use, saves the investment in the upfront work, and improves the efficiency of the preparatory work. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 It is a schematic structural diagram when the gas mobile collection device for the spontaneous combustion danger area of residual coal in the goaf of the present invention collects gas;

[0030] Figure 2 For the present invention Figure 1 It is a partial enlarged structural diagram of the air release valve;

[0031] Figure 3 It is a schematic structural diagram when the gas mobile collection device for the spontaneous combustion danger area of residual coal in the goaf of the present invention releases pressure;

[0032] Figure 4 For the present invention Figure 3 It is a partial enlarged structural diagram of the air release valve;

[0033] Figure 5 It is a schematic diagram of the measuring point when the gas mobile collection device for the spontaneous combustion danger area of residual coal in the goaf of the present invention is working;

[0034] In the figure: 1. Bundle pipe; 2. Cable; 3. U-shaped chuck; 4. Air release valve; 5. Protective steel pipe; 6. Annular airbag; 7. Inflation valve; 8. Inflation port; 9. Air extraction valve; 10. Air extraction port; 11. Flow port; 12. Protective cover; 13. Air intake port; 14. Air release channel; 15. Annular iron sheet; 16. Base; 17. Sampling point; 18. Collection device; 19. Fixed pulley; 20. Roadway; 21. Bundle pipe coiler; 22. Air pump; 23. Cable coiler; 401. Metal base; 402. Base rubber pad; 403. Buffer; 404. Housing; 405. Air release port; 406. Permanent magnet; 407. Magnet rubber pad. Detailed implementation mode

[0035] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0036] As Figures 1 to 5 shown, the present invention provides a gas mobile collection device for the spontaneous combustion dangerous area of residual coal in the goaf, including:

[0037] A bundle pipe 1, one end of the bundle pipe 1 is a sealed end, the bundle pipe 1 is arranged inside the protective steel pipe 5, and a plurality of flow ports 11 are opened on the protective steel pipe 5; both ends of the bundle pipe 1 are connected with traction mechanisms, and the open end of the bundle pipe 1 is communicated with an air pump 22;

[0038] An air extraction valve 9, an air extraction port 10 is opened on the bundle pipe 1, the air extraction valve 9 is communicated with the air extraction port 10, and the air extraction valve 9 is a one-way valve;

[0039] An annular airbag 6, the inner layer material of the annular airbag 6 is natural rubber, and the outer layer is wrapped with a polyester filament protective sleeve. The annular airbag 6 is arranged on both sides of the air extraction valve 9 and is arranged between the bundle pipe 1 and the protective steel pipe 5; an air release valve 4 is installed on the annular airbag 6;

[0040] An inflation valve 7, the inflation valve 7 is arranged inside the annular airbag 6, and the annular airbag 6 is communicated with the bundle pipe 1 through the inflation valve 7; the inflation valve 7 is a one-way valve.

[0041] For a further optimized solution, the traction mechanism includes two cable winders 23, which are respectively arranged in two roadways 20; a base 16 is provided at the sealed end of the bundle tube 1, and U-shaped chucks 3 are provided on both the base 16 and the bundle tube 1. The U-shaped chucks 3 are made of carbon steel galvanized chucks. The cable 2 on one cable winder 23 is connected to the U-shaped chuck 3 on the base 16, and the cable 2 on the other cable winder 23 is connected to the U-shaped chuck 3 on the bundle tube 1; the two cable winders 23 synchronously and reversely adjust the winding and unwinding of the cable 2.

[0042] For a further optimized solution, a bundle tube winder 21 is arranged in the roadway 20 where the air pump 22 is located. The bundle tube winder 21 is used to collect and arrange the bundle tube 1, and the bundle tube winder 21 and the cable winder 23 in the same roadway 20 are adjusted synchronously and in the same direction.

[0043] For a further optimized solution, the air pump 22 adopts the FBZ-93D-15 explosion-proof high-pressure vortex blower frequency conversion model.

[0044] For a further optimized solution, a ring-shaped iron sheet 15 is connected to the ring-shaped air bag 6. The ring-shaped iron sheet 15 is sleeved on the bundle tube 1, and the air release valve 4 is installed on the ring-shaped air bag 6 through the ring-shaped iron sheet 15.

[0045] For a further optimized solution, the air release valve 4 includes a metal base 401, which is installed on the ring-shaped iron sheet 15. A housing 404 is installed on the side of the metal base 401 away from the ring-shaped iron sheet 15. A buffer 403 and a permanent magnet 406 are arranged inside the housing 404. The permanent magnet 406 is installed on the metal base 401 through the buffer 403; a gas release channel 14 is provided on the metal base 401, and the gas in the ring-shaped air bag 6 enters the housing 404 of the air release valve 4 through the gas release channel 14; an air release port 405 is opened on the housing 404.

[0046] When the permanent magnet 406 is at the farthest point, the buffer 403 is in its original length state, and the gas in the ring-shaped air bag 6 is depressurized at the air release port 405. The permanent magnet 406 is only attracted by the magnetic force and has a tendency to return to the nearest point; when the permanent magnet 406 is at the nearest point, the permanent magnet 406 is subjected to the magnetic attraction, the outward damping force generated by the compression of the buffer 403, and the gas pressure. Since the magnetic force is opposite to the damping force and the gas pressure at this time, the permanent magnet 406 reaches equilibrium at the nearest point. As the air pump 22 gradually pumps air, the gas pressure increases, and the permanent magnet 406 has a tendency to move away from the nearest point; when the permanent magnet 406 is at the middle position, the permanent magnet 406 is subjected to the magnetic attraction, the damping force generated by the compression of the buffer 403, and the gas pressure. However, as the gas is depressurized at the air release port 405, the gas pressure decreases, and the permanent magnet 406 gradually returns to the nearest point.

[0047] For a further optimized solution, the air release valve 4 is a pure mechanical structure, which is controlled by magnetic force, damping force, and gas pressure, and is used to achieve conditional autonomous pressure relief and slow recovery, and control the contraction of the annular airbag 6; the metal base 401 is made of alloy steel, the base rubber pad 402 and the magnet rubber pad 407 are made of wear-resistant rubber, the housing 404 is made of aluminum alloy, and the permanent magnet 406 is made of iron-chromium-cobalt permanent magnet material.

[0048] For a further optimized solution, a base rubber pad 402 is provided between the metal base 401 and the housing 404, and magnet rubber pads 407 are installed at both ends of the permanent magnet 406.

[0049] For a further optimized solution, the cable 2 is marked with an identifier, which is used to obtain the position information of the acquisition device 18 inside the protection steel pipe 5.

[0050] For a further optimized solution, a protective cover 12 is provided outside the circulation port 11 of the protection steel pipe 5, and an air intake port 13 is provided on the protective cover 12, and the circulation port 11 and the air intake port 13 are not arranged corresponding to each other.

[0051] For a further optimized solution, a fixed pulley 19 is installed inside the elbow at the turning point of the protection steel pipe 5.

[0052] A method for mobile gas collection in areas with spontaneous combustion hazards of residual coal in goafs specifically includes the following steps:

[0053] Step 1. Use a DN50 seamless steel pipe with a length of 6m, with flanges welded at both ends as the protective steel pipe 5, and leave a flow port 11 in the middle of each steel pipe. The flow port 11 is arranged in a ring around the protective steel pipe 5, with 4 in each ring, a total of 2 rings, a radius of the flow port 11 of 0.01m, and a distance between each ring of 0.10m. The annular iron sheet 15 is welded on the protective steel pipe 5, and a 0.15m interval is left between each pair of annular iron sheets 15. The annular air bag 6 is 0.20m long, and the protective cover 12 is welded around the protective steel pipe 5, with a length of 0.55m. The radius of the air intake port 13 is 0.02m, and the position is left corresponding to the flow port 11, but not left vertically. The protective steel pipe 5 is pre-arranged and connected at the opening of the cut eye and other positions; PE-ZKW / 10×1 polyethylene bundle pipe and flame-retardant and anti-static cable rope for coal mines are used, and the cable 2 at the front end is marked and numbered every 0.10m, and the bundle pipe 1 at the rear end is marked and numbered every 0.10m. and the cable 2 are connected every 0.10m and marked and numbered at the same point; the collection device 18 is placed in the protective steel pipe 5, the cable 2 at the front end is connected to the U-shaped clamp 3 at the front end of the collection device 18, the bundle tube 1 is connected to the rear end of the collection device 18, and the 1.00m length of the end where the cable 2 is connected to the rear end of the collection device 18 is divided into two strands, which are respectively connected to the U-shaped clamps 3 on both sides of the rear end of the collection device 18, and the bundle tube 1 and the cable 2 are laid in the protective steel pipe 5, and the excess parts are collected in the bundle tube reel 21 and the cable reel 23; after the protective steel pipe 5, the bundle tube 1 and the cable 2 are laid, the collection device 18 is moved to the sampling point 17 at the end, the bundle tube 1 and the cable 2 are tightened, and the identification numbers of the bundle tube 1 and the cables 2 at both ends are recorded; each time a new sampling point 17 to be collected is reached, the annular air bag 6 is in a deflated state, the deflation valve 4 is in a closed state, and the inflation valve 7 and the exhaust valve 9 are in a closed state;

[0054] Step 2, connect the pumping port of the air pump 22 to the bundle tube 1, and carry out the first stage of pumping operation. The air extraction valve 9 between the annular air bags 6 is in a closed state, and the inflation valve 7 inside the annular air bag 6 is in an open state. The time required for pumping air is calculated according to the laying length of the bundle tube 1 and the efficiency of the air pump 22. At this time, the pressure of the air pump 22 cannot activate the deflation valve 4, and the gas accumulates in the annular air bag 6. The annular air bag 6 gradually swells and is in close contact with the protective steel pipe 5; stop the first stage of pumping operation of the air pump 22, and switch the inflation valve 7 to a closed state;

[0055] Step 3, connect the air pump 22's air extraction port to the bundle tube 1, the inflation valve 7 in the annular air bag 6 is still in a closed state, the air extraction valve 9 between the annular air bags 6 is opened, and according to the length of the bundle tube 1 and the efficiency of the air pump 22, after the pre-extraction time is reached, connect the ball bladder to the pumping port of the air pump 22, and the gas at the sampling point 17 enters the collection device 18 through the air intake port 13, the flow port 11, and the air extraction valve 9, and then enters the bundle tube 1, completing the collection operation; stop the air extraction operation of the air pump 22, and switch the air extraction valve 9 to a closed state;

[0056] Step 4: Connect the air pumping port of the air pump 22 to the bundle tube 1, adjust the power of the air pump 22, and perform the second-stage air pumping operation. The pressure of the second-stage air pumping operation of the air pump 22 is much greater than that of the first-stage air pumping operation. The inflation valve 7 is converted to the open state, and the air extraction valve 9 remains in the closed state. As the gas accumulates in the annular air bag 6, the positive gas pressure at this time will open the air release valve 4, and the gas in the annular air bag 6 enters the air release valve 4 and is depressurized through the air release port 405; according to the test time on the ground, stop the second-stage air pumping operation of the air pump 22, and the inflation valve 7 is converted to the closed state;

[0057] Step 5: Stop the second-stage air pumping operation of the air pump 22. The air pump 22 is in a stopped state. The gas in the annular air bag 6 is gradually depressurized through the air release valve 4, and the positive gas pressure gradually decreases. The permanent magnet 406 has a tendency to approach the nearest point. The gas in the annular air bag 6 still passes through the air release valve 4 for depressurization, and the positive air pressure gradually drops to zero. The permanent magnet 406 gradually returns to the nearest point, and the air release valve 4 gradually returns to the closed state; finally, the annular air bag 6 returns to the deflated state, and the close contact state between the annular air bag 6 and the protection steel pipe 5 is destroyed;

[0058] Step 6: Adjust the cable reel 23 and the bundle tube reel 21 in the two roadways 20, move the acquisition device 18 through the cable 2, and control the moving distance of the acquisition device 18 according to the identification of the cable 2 until it reaches the next sampling point 17 to be sampled.

[0059] The gas mobile acquisition device for the spontaneous combustion dangerous area of residual coal in the goaf provided by the present invention can be pre-laid in goaf areas such as the open-off cut. Through the gas extraction port 13 provided by the protection steel pipe 5 and the protection cover 12, the air pump 22 and the bundle tube 1 are used to collect the gas at various locations in the goaf. The present invention only needs to connect the bundle tube 1, and there is no need to increase the number of bundle tubes 1 and the size and number of protection steel pipes 5 as the number of sampling points 17 to be left increases, which improves the economy of goaf gas acquisition to a certain extent and reduces the workload of the preliminary preparation work. In addition, the device can move freely inside the protection steel pipe 5 in the goaf, can sample and analyze each measuring point, and is convenient for mastering the overall gas concentration distribution inside the goaf.

[0060] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A mobile gas collection device for the spontaneous combustion hazard zone of coal in goaf, characterized in that: include: A bundle tube (1), one end of the bundle tube (1) being a sealed end, the bundle tube (1) being inserted into the interior of a protective steel tube (5), the protective steel tube (5) being provided with a plurality of flow openings (11); both ends of the bundle tube (1) being connected to a traction mechanism, and the open end of the bundle tube (1) being connected to an air pump (22); An air extraction valve (9), wherein an air extraction port (10) is provided on the bundle tube (1), the air extraction valve (9) is in communication with the air extraction port (10), and the air extraction valve (9) is a one-way valve; an annular air bag (6), the annular air bag (6) being arranged on both sides of the air extraction valve (9), and the annular air bag (6) being arranged between the bundle tube (1) and the protective steel tube (5); an air release valve (4) being installed on the annular air bag (6); An inflation valve (7), wherein the inflation valve (7) is arranged in the annular air bag (6), and the annular air bag (6) is connected to the bundle tube (1) through the inflation valve (7); the inflation valve (7) is a one-way valve.

2. The mobile gas collection device for the spontaneous combustion hazard zone of coal in goaf according to claim 1 is characterized in that: The traction mechanism comprises two cable reels (23), and the two cable reels (23) are respectively arranged in two lanes (20); a base (16) is arranged at the sealed end of the bundle tube (1), and a U-shaped clamp (3) is arranged on the base (16) and the bundle tube (1); the cable (2) on one cable reel (23) is connected to the U-shaped clamp (3) on the base (16), and the cable (2) on the other cable reel (23) is connected to the U-shaped clamp (3) on the bundle tube (1); the two cable reels (23) synchronously adjust the retracting and releasing of the cable (2) in reverse.

3. The mobile gas collection device for the spontaneous combustion hazard zone of coal in goaf according to claim 2 is characterized in that: A tube bundle reel (21) is provided in the tunnel (20) where the air pump (22) is located. The tube bundle reel (21) is used to collect and organize the tube bundles (1). The tube bundle reel (21) and the cable reel (23) in the same tunnel (20) are adjusted synchronously and in the same direction.

4. The mobile gas collection device for the spontaneous combustion hazard zone of coal in goaf according to claim 1 is characterized in that: The annular air bag (6) is connected to an annular iron sheet (15), the annular iron sheet (15) is sleeved on the bundle tube (1), and the air release valve (4) is installed on the annular air bag (6) through the annular iron sheet (15).

5. The mobile gas collection device for the spontaneous combustion hazard zone of coal in goaf according to claim 4 is characterized in that: The air release valve (4) comprises a metal base (401), wherein the metal base (401) is mounted on the annular iron sheet (15), a shell (404) is mounted on the side of the metal base (401) away from the annular iron sheet (15), a buffer (403) and a permanent magnet (406) are arranged inside the shell (404), and the permanent magnet (406) is mounted on the metal base (401) through the buffer (403); an air release channel (14) is reserved on the metal base (401), and the gas in the annular air bag (6) enters the shell (404) of the air release valve (4) through the air release channel (14); and an air release port (405) is opened on the shell (404).

6. The mobile gas collection device for the spontaneous combustion hazard zone of coal in goaf according to claim 5 is characterized in that: A base rubber pad (402) is provided between the metal base (401) and the shell (404), and magnet rubber pads (407) are installed at both ends of the permanent magnet (406).

7. The mobile gas collection device for the spontaneous combustion hazard zone of coal in goaf according to claim 2 is characterized in that: The cable (2) is marked with an identification mark, and the identification mark is used to obtain the position information of the collection device (18) in the protective steel pipe (5).

8. The mobile gas collection device for the spontaneous combustion hazard zone of coal in goaf according to claim 1 is characterized in that: A protective cover (12) is arranged outside the circulation port (11) of the protective steel pipe (5), an air intake port (13) is arranged on the protective cover (12), and the circulation port (11) and the air intake port (13) are not arranged correspondingly.

9. The mobile gas collection device for the spontaneous combustion hazard zone of coal in goaf according to claim 1 is characterized in that: A fixed pulley (19) is installed inside the elbow at the turning point of the protective steel pipe (5).

10. A mobile method for collecting gas from the spontaneous combustion hazard zone of coal in goaf, characterized in that: The mobile gas collection device for the spontaneous combustion hazardous area of ​​coal in goaf as described in any one of claims 1 to 9 specifically comprises the following steps: Step 1: According to the markings of the cable (2) and the bundle tube (1), the cable reel (23) and the bundle tube reel (21) are adjusted to make the collection device (18) reach the position of the sample point (17) to be collected; Step 2: Use the air pump (22) to perform the first stage of pumping operation. Under the action of the positive pressure of the gas, the air extraction valve (9) is in a closed state, and the inflation valve (7) inside the annular air bag (6) is in an open state. The gas accumulates in the annular air bag (6), and the annular air bag (6) swells until it is in close contact with the protective steel pipe (5). At this time, the air release valve (4) is in a closed state. Stop the first stage of pumping operation of the air pump (22). Since no positive pressure of the gas is generated, the inflation valve (7) is switched to a closed state. Step 3, the air pump (22) is switched to the exhaust state, the charging valve (7) is in the closed state, and under the effect of the negative pressure of the gas, the exhaust valve (9) is opened, and the gas at the sampling point (17) enters the bundle tube (1) through the gas inlet (13), the flow port (11), and the exhaust valve (9), completing the collection operation; the exhaust operation of the air pump (22) is stopped, because no negative pressure of the gas is generated, and the exhaust valve (9) is switched to the closed state; Step 4, the air pump (22) is switched to a pumping state, and a second-stage pumping operation is performed. The pressure of the second-stage pumping operation of the air pump (22) is greater than the pressure of the first-stage pumping operation. The inflation valve (7) is switched to an open state, and the exhaust valve (9) is still in a closed state. As the gas accumulates in the annular air bag (6), the deflation valve (4) is opened, and the gas in the annular air bag (6) enters the deflation valve (4), and the pressure is released through the deflation port (405); Step 5, stop the second stage pumping operation of the air pump (22), the air pump (22) is in a stopped state, no positive gas pressure is generated, and the inflation valve (7) is switched to a closed state; the gas in the annular air bag (6) is depressurized through the air release valve (4) until the positive gas pressure in the annular air bag (6) gradually drops to zero, the permanent magnet (406) returns to the nearest point under the action of the damping force and the magnetic force, and the air release valve (4) returns to the closed state; the close contact state between the annular air bag (6) and the protective steel pipe (5) is destroyed; Step 6: Adjust the cable reel (23) and the tube reel (21) in the two lanes (20), move the collection device (18) through the cable (2), and control the moving distance of the collection device (18) according to the mark of the cable (2) until it reaches the next sample point (17) to be collected.

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