Goaf gas collecting device and method

Abstract

The invention discloses a goaf gas collecting device and method, and belongs to the technical field of goaf gas monitoring. The device comprises a special pipeline, an integrated air extractor and a transmission screw rod, the special pipeline is arranged on the side, close to the goaf, of the air inlet crossheading and the air return crossheading of the working face, it is guaranteed that the integrated air extractor moves in the special pipeline, and the integrated air extractor moves into the goaf through rotation of the transmission screw rod to collect air in the goaf. Through the device and the method, gas at different positions of the goaf can be collected at any time, goaf gas collection efficiency is improved, goaf coal spontaneous combustion degree can be analyzed in real time, and goaf coal spontaneous combustion prevention and control levels are improved.

Description

Technical field:

[0001] The invention relates to the technical field of goaf gas monitoring, and in particular to a goaf gas measuring device and an application method thereof. Background technology:

[0002] Coal mine fire is one of the six major coal mine disasters, posing a serious threat to coal mine production and worker safety. The occurrence of fire may cause poisoning of underground workers, mine shutdown and other hazards, directly affecting the normal production of the mine. In addition, fire may cause gas and coal dust explosions, causing equipment damage, waste of coal resources, consumption of a large amount of manpower and material resources, and causing huge losses to the economy.

[0003] In order to prevent and deal with coal mine fires, goaf gas composition analysis is an important means. The goaf gas composition is an important reference indicator for predicting the degree of spontaneous combustion of coal in the goaf. At the same time, the goaf gas composition is also an important basis for the division of the "three zones" of spontaneous combustion of coal in the goaf. This division provides a basis for technical measures such as nitrogen injection in the goaf, plugging air leakage, and determining the recovery speed. In order to sample and analyze the gas in the goaf of the fully-mechanized working face, a gas sampling device is required.

[0004] At present, the existing gas sampling device is mainly used for gas sampling from the pre-buried bundle pipes in the inlet and return air lanes of the fully mechanized mining working face. The pre-buried bundle pipes are gradually buried in the goaf as the working face is mined. Since the bundle pipes are buried, they cannot be moved. It is necessary to extract the gas in the bundle pipes in real time as the working face is mined, so as to obtain gas samples at different positions in the goaf. Since the three zones of the goaf are long, the mining of the working face is slow. After the goaf is mined for a certain distance, it is necessary to go down the well to take a gas sample. The measurement cycle of the three zones of the goaf is long, which consumes a lot of manpower and material resources.

[0005] Therefore, a more convenient and freely movable goaf gas sampling device is needed to solve the problems of inconvenience and long cycle in goaf gas sampling. Summary of the invention:

[0006] In view of the shortcomings of the prior art, the present invention provides a goaf gas collection device and method, which has simple steps, is easy to use, can accurately locate the position where gas needs to be extracted as needed, and has a wide detection range.

[0007] In order to achieve the above technical purpose, a goaf gas collection device of the present invention comprises a special pipeline, a large number of holes are arranged on the special pipeline, an integrated gas extraction device capable of sliding along the special pipeline is arranged in the special pipeline, the integrated gas extraction device is respectively connected to the gas extraction pipe and the gas injection pipeline, and the integrated gas extraction device is connected to a transmission screw rod for driving it to slide along the special pipeline;

[0008] The special pipeline is a pipeline structure made of stainless steel, and multiple holes are evenly arranged in the upper half of the pipeline structure cross section.

[0009] The integrated air extraction device comprises a cylindrical inner shell, the front and rear ends of the inner shell are respectively sleeved with a left capsule and a right capsule, a filter screen is provided on the inner shell between the left capsule and the right capsule, the inner space of the filter screen is an air chamber, a spiral bayonet pipe is axially provided on the inner side of the inner shell, the end of the air extraction pipe is arranged in the air chamber inside the filter screen, and the end of the air injection pipe is respectively connected to the left capsule and the right capsule to control the expansion or contraction of the left capsule and the right capsule;

[0010] A protruding thread is arranged on the outer side of the transmission screw rod, and the protruding thread matches with the thread in the spiral bayonet pipe, so that the integrated air extraction device can be moved inside the special pipe by rotating the transmission screw rod.

[0011] Furthermore, the special pipe can be spliced ​​and extended as needed. Each section of the special pipe is 2m long, with an outer diameter of 12cm and an inner diameter of 10cm. The special pipes are connected by flanges arranged at the head and tail. A special pipe cover for closing the opening is provided in front of the special pipe at the end, and a bearing a is provided on the special pipe cover to facilitate the rotation of the transmission screw rod.

[0012] Furthermore, the holes on the special pipe are only arranged on the semicircular surface above the special pipe and cover the entire special pipe.

[0013] Furthermore, the special pipeline is buried in the air inlet chute and the return air chute of the coal mining face close to the goaf, and the specific buried depth is estimated according to the three-zone distribution of the goaf.

[0014] Furthermore, the outer diameter of the transmission screw rod is 30mm, the length is 2m, and the pitch of the protruding thread of the transmission screw rod is 5cm; the transmission screw rod can be spliced ​​and extended as needed, the end of the transmission screw rod is provided with an external thread, and the tail is provided with an internal thread, which is adapted to the internal thread of the tail, and the thread diameter is 20mm.

[0015] Furthermore, a gear a is provided at the tail of the transmission screw rod for connecting with a power source for transmission.

[0016] The power source is a hand-cranked power source, including a gear b matched with a gear a, and the gear b is connected to a hand-cranked rocker; wherein the hand-cranked power source is arranged in a shell, a bearing b is arranged between the transmission screw rod and the shell, and a bearing c is arranged between the hand-cranked rocker and the shell.

[0017] Furthermore, the surface of the inner shell is provided with holes communicating with the left capsule and the right capsule. When gas is injected, the gas enters the outer capsule layer from the holes, causing the capsule layer to swell and be fixed in a special pipe.

[0018] Furthermore, the air extraction pipeline is located above the air injection pipeline, and the air extraction pipeline passes through the inner shell to the air chamber.

[0019] A working method of a goaf gas collection device, the steps are as follows:

[0020] Step 1: Determine the laying length of the special pipeline according to the distribution range of the three zones in the goaf, directly lay the special pipeline on the side of the air inlet chute and the return air chute of the coal mining face close to the goaf, and use flanges to connect the special pipelines. Install a special pipeline cover at one end of the special pipeline that goes deep into the goaf, install bearing a in the special pipeline cover, and fit the protruding external thread of the head of the transmission screw rod. The transmission screw rod is connected end to end through the head external thread and the tail internal thread to extend its length. During the installation process, the laying of the special pipeline and the installation of the transmission screw rod are carried out simultaneously until the laying length meets the actual production requirements of the mining area;

[0021] When installing the last section of the transmission screw rod, the integrated air extraction device is fitted with the transmission screw rod through the spiral bayonet pipe, and a gear a is welded at the end of the transmission screw rod for transmission;

[0022] Step 2: After the integrated exhaust device is installed, the right interface of the integrated exhaust device is connected with the corresponding devices in turn, wherein the gas injection pipeline is connected to the compressed air system pipeline of the coal mine itself, the exhaust pipeline is connected to the mine vacuum pump, and the connection end of the gas injection pipeline and the compressed air system pipeline is equipped with a tee pipe and a gas pressure gauge;

[0023] Step 3: After the special pipeline and the integrated gas extraction device are fully installed, as the working face advances forward, the goaf gradually collapses, and the special pipeline will be buried by the collapsed coal and gangue. When the progress of the working face reaches the three-zone measurement standard, measurement begins; during measurement, the integrated gas extraction device is sent into the goaf by means of a hand-cranked transmission screw rod, and the moving distance of the integrated gas extraction device is recorded at the same time, so as to determine its position in the goaf;

[0024] Step 4: Move the integrated vacuum device from the starting position to the deepest part of the goaf according to a certain sampling interval. The sampling interval is set as needed. When the integrated vacuum device moves to the sampling position, stop moving, and then open the three-way valve b of the coal mine compressed air system pipeline, and inject gas into the left capsule and the right capsule through the gas injection pipeline. The gas first enters the inner shell through the gas injection pipeline, and then enters the capsule through the holes on the surface of the inner shell, causing the capsule to swell. When the pressure gauge connected to the capsule shows a reading of 0.5 atmospheres, close the three-way valve b to stop the gas supply. The capsule isolates the front and rear space of the special pipeline, and only forms a sealed air chamber between the capsules, so that the holes on the special pipeline are connected to the goaf, and then open The intrinsically safe negative pressure gas collector for mining extracts gas. The gas extracted during the extraction only comes from the goaf where the integrated extraction device is located. The extracted gas composition is detected by a portable gas detector. After the portable gas detector displays stable data, the gas at the location of the integrated extraction device is collected with an air bag. When the collection is completed, the location of the integrated extraction device in the goaf, the sampling time and other information are marked on the air bag; the gas in the capsule is released by opening the three-way pipe valve a connected to the gas injection pipe, and then the integrated extraction device is moved to the next measuring point by shaking the hand-cranked rocker, and the above steps are repeated for extraction sampling; finally, all the air bags are handed over to the ground for detection and analysis to obtain the gas data at different locations in the goaf.

[0025] Beneficial effects: With the mining process, the device lays a special pipeline in the tunnel. The special pipeline has uniform holes, and the gas in the goaf is collected through the holes. Since the holes are evenly distributed above the pipeline and the pipeline runs through the entire goaf, the integrated gas extraction device can be moved to any position in the pipeline and fixed with left and right capsules in the area that needs to be detected, so as to only collect the gas in the current goaf position, solving the problem that the traditional three-zone gas measurement device in the goaf can only collect gas at fixed points. Description of the drawings:

[0026] Figure 1 Schematic diagram of the mining face layout using the goaf gas collection device in the embodiment of the present invention

[0027] Figure 2 This is a cross-sectional structural diagram of the goaf gas collection device disclosed in the present invention.

[0028] Figure 3 The left side schematic diagram of the goaf gas collection device disclosed in the present invention

[0029] Figure 4 Schematic diagram of the end section of the transmission screw rod of the goaf gas collection device of the present invention

[0030] Figure 5 Schematic diagram of the middle section of the transmission screw rod of the goaf gas collection device of the present invention

[0031] Figure 6 This is a front view of the overall structure of the goaf gas collection device of the present invention

[0032] Figure 7 The overall structure of the goaf gas collection device of the present invention is shown in the top view

[0033] In the figure, 1. special pipe cover; 2. special pipe; 3. left capsule; 4. filter; 5. right capsule; 6. exhaust pipe; 7. gas injection pipe; 8. transmission screw rod; 9. gear a; 10. spiral bayonet pipe; 11. protruding thread; 12. capsule layer; 13. inner shell; 14. bearing a; 15. external thread of transmission screw rod head; 16. internal thread of transmission screw rod tail; 17. goaf; 18. bearing b; 19. bearing c; 20. hand crank; 21. gear b; 22. hole of inner shell; 23. three-way pipe; 24. pressure gauge; 25. three-way pipe valve a; 26. three-way pipe valve b. Specific implementation method:

[0034] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0035] like Figure 1 As shown in Figure 2, the present invention discloses a gas collection device for a goaf, including a special pipeline 2, on which a large number of holes are provided, and the special pipeline 2 is provided with an integrated gas extraction device that can slide along the special pipeline, and the integrated gas extraction device is respectively connected to an exhaust pipe 6 and an injection pipeline 7, and the exhaust pipe 6 is located above the injection pipeline 7, and the exhaust pipe 6 passes through the inner shell 13 to the air chamber.

[0036] The integrated air extraction device is connected to a transmission screw rod 8 for driving it to slide along the special pipe; the special pipe 2 can be spliced ​​and extended as needed, each section of the special pipe 2 is 2m long, with an outer diameter of 12cm and an inner diameter of 10cm, and the special pipes 2 are connected by flanges arranged at the head and tail, and a special pipe cover 1 for closing the opening is provided in front of the special pipe 2 at the end, and a bearing a14 is provided on the special pipe cover 1 for facilitating the rotation of the transmission screw rod 8, such as Figure 3 , Figure 4 and Figure 5As shown. The holes on the special pipe 2 are only set on the semicircular surface above the special pipe 2, and cover the entire special pipe 2. The special pipe 2 is laid on the side of the air intake chute and the return air chute of the coal mining face close to the goaf, and the specific laying length is estimated according to the three-zone distribution of the goaf. The outer diameter of the transmission screw rod 8 is 30mm, the length is 2m, and the pitch of the protruding thread 11 of the transmission screw rod 8 is 5cm; the transmission screw rod 8 can be spliced ​​and extended as needed, and the end of the transmission screw rod 8 is provided with an external thread 15, and the tail is provided with an internal thread 16, which is adapted by the external thread 15 and the tail internal thread 16, and the thread diameter is 20mm; wherein the external thread 15 of the transmission screw rod 8 at the head end is connected to the bearing of the special pipe cover 1 at the end of the special pipe 2. The tail of the transmission screw rod is provided with a gear a9 for connecting to the power source for transmission. The power source is a hand-cranked power source, including a gear b21 matched with the gear a9, and the gear b21 is connected to the hand-cranked rocker 20; wherein the hand-cranked power source is arranged in the housing, a bearing b18 is arranged between the transmission screw rod 8 and the housing, and a bearing c19 is arranged between the hand-cranked rocker 20 and the housing. The surface of the inner shell 13 is provided with holes connected to the left capsule 3 and the right capsule 5. When gas is injected, the gas enters the outer capsule layer 12 from the holes, causing the capsule layer 12 to swell and be fixed in the special pipe 2.

[0037] like Figure 6 and Figure 7 As shown, the special pipeline 2 is a pipeline structure made of stainless steel, and a plurality of holes are evenly arranged in the upper semicircle of the cross section of the pipeline structure.

[0038] The integrated air extraction device includes a cylindrical inner shell 13, and the front and rear ends of the inner shell 13 are respectively provided with a left capsule 3 and a right capsule 5, and a filter screen 4 is provided on the inner shell 13 between the left capsule 3 and the right capsule 5. The inner space of the filter screen 4 is an air chamber, and a spiral bayonet pipe 10 is axially provided on the inner side of the inner shell 13. The end of the air extraction pipe 6 is arranged in the air chamber inside the filter screen 4, and the ends of the air injection pipe 7 are respectively connected to the left capsule 3 and the right capsule 5 to control the expansion or contraction of the left capsule 3 and the right capsule 5; a protruding thread 11 is provided on the outer side of the transmission screw rod 8, and the protruding thread 11 matches the thread inside the spiral bayonet pipe 10, so that the integrated air extraction device can be moved inside the special pipe 2 by rotating the transmission screw rod 8.

[0039] A working method of a goaf gas collection device, the steps are as follows:

[0040] Step 1:

[0041] Determine the laying length of the special pipeline 2 according to the distribution range of the three zones in the goaf, such as Figure 1As shown, the special pipeline is laid on the side of the air inlet chute and the return air chute of the coal mining face close to the goaf, and the special pipelines are connected by flanges. A special pipeline cover 1 is installed at one end of the special pipeline 2 that penetrates into the goaf, and a bearing a14 is installed in the special pipeline cover 1. The bearing a14 is fitted into the protruding external thread 15 of the head of the transmission screw rod 8. The transmission screw rod 8 is connected end to end through the head external thread 15 and the tail internal thread 16 to extend its length. During the installation process, the laying of the special pipeline 2 is carried out simultaneously with the installation of the transmission screw rod 8 until the laying length is greater than the length from the working face to the asphyxiation zone.

[0042] When installing the last section of the transmission screw rod 8, the integrated air extraction device is fitted with the transmission screw rod 8 through the spiral bayonet pipe 10, and a gear a9 is welded at the end of the transmission screw rod 8 for transmission;

[0043] Step 2:

[0044] After the integrated exhaust device is installed, the right interface of the integrated exhaust device is connected to the corresponding device in turn, wherein the gas injection pipeline 7 is connected to the compressed air system pipeline of the coal mine itself, and the exhaust pipeline 6 is connected to the mine vacuum pump. The mine vacuum pump uses a mine intrinsically safe negative pressure gas collector, model CFB10, with a flow rate of 10L / min. The diameter of the gas injection pipeline 7 is 2cm; the connection end of the gas injection pipeline 7 and the compressed air system pipeline is equipped with a tee pipe 23 and a gas pressure gauge 24. The diameter of the exhaust pipeline 6 is 1cm.

[0045] Step 3:

[0046] After the special pipeline and the integrated exhaust device are fully installed, as the working face moves forward, the special pipeline gradually penetrates into the goaf, and the measurement begins when the end of the pipeline is estimated to be buried in the asphyxiation zone of the goaf. During the measurement, the integrated exhaust device is sent into the goaf by means of the hand-cranked transmission screw 8, where the gear ratio of the hand-cranked gear b21 and the gear a9 at the end of the transmission screw is 4:1, and the pitch of the external protruding thread 11 of the transmission screw is 5cm. Therefore, the hand-cranked gear b rotates 1 circle, the transmission screw rotates 4 circles, and the integrated exhaust device moves forward 0.2m. The number of circles of the hand-cranked gear b21 is recorded to estimate the travel distance of the integrated exhaust device and determine its position in the goaf.

[0047] Step 4:

[0048] When the integrated air extraction device is moved to the designated measuring point by hand crank, the three-way valve b26 of the coal mine compressed air system pipeline is opened, and air is injected into the left capsule 3 and the right capsule 5 on the front and rear sides through the air injection pipeline 7. The gas first enters the inner shell 13 through the air injection pipeline 7, and then enters the capsule through the hole 22 on the surface of the inner shell 13, causing the capsule to swell. When the pressure gauge 24 shows a reading of 0.5 atmospheres, the three-way valve b26 is closed to stop the air supply. After the reading of the pressure gauge 24 stabilizes, it means that the capsule is well sealed. The left capsule 3 and the right capsule 5 isolate the space before and after the special pipeline 2, and only a sealed air chamber is formed between the left capsule 3 and the right capsule 5, and it is connected to the goaf through the hole on the special pipeline 2; then open the mine intrinsically safe negative pressure gas collector, and pump gas for about 3 minutes. During the pumping process, use a portable gas detector to detect the composition of the extracted gas. After the portable gas detector displays stable data, collect the collected gas with an air bag. When the collection is completed, mark the position of the integrated gas extraction device in the goaf, sampling time and other information on the air bag. Then open the three-way pipe valve a25 to release the gas in the left capsule 3 and the right capsule 5. After the gas is released, move the integrated gas extraction device to the next measuring point and repeat the above steps to extract gas sampling. Finally, all air bags are handed over to the ground for detection and analysis to obtain gas data at different locations in the goaf.

Claims

1. A gas collection device for goaf, characterized in that: The invention comprises a special pipeline (2), wherein a large number of holes are arranged on the special pipeline (2), wherein an integrated air extraction device capable of sliding along the special pipeline is arranged in the special pipeline (2), wherein the integrated air extraction device is respectively connected to an air extraction pipe (6) and an air injection pipeline (7), and wherein the integrated air extraction device is connected to a transmission screw rod (8) for driving the integrated air extraction device to slide along the special pipeline; The special pipe (2) is a pipe structure made of stainless steel, and a plurality of holes are evenly arranged in the upper half of the cross section of the pipe structure. The integrated air extraction device comprises a columnar inner shell (13), wherein the front and rear ends of the inner shell (13) are respectively provided with a left capsule (3) and a right capsule (5), a filter screen (4) is provided on the inner shell (13) between the left capsule (3) and the right capsule (5), the inner space of the filter screen (4) is an air chamber, a spiral bayonet pipe (10) is axially provided on the inner side of the inner shell (13), the end of the air extraction pipe (6) is arranged in the air chamber inside the filter screen (4), and the end of the air injection pipe (7) is respectively connected to the left capsule (3) and the right capsule (5) to control the expansion or contraction of the left capsule (3) and the right capsule (5); A protruding thread (11) is provided on the outside of the transmission screw rod (8), and the protruding thread (11) matches the thread inside the spiral bayonet pipe (10), so that the integrated air extraction device can be moved inside the special pipe (2) by rotating the transmission screw rod (8).

2. A goaf gas collection device according to claim 1, characterized in that: The special pipe (2) can be spliced ​​and extended as needed. Each section of the special pipe (2) is 2m long, with an outer diameter of 12cm and an inner diameter of 10cm. The special pipes (2) are connected by flanges arranged at the head and tail. A special pipe cover (1) for closing the opening is arranged in front of the special pipe (2) at the end. The special pipe cover (1) is provided with a bearing a (14) for facilitating the rotation of the transmission screw rod (8).

3. A goaf gas collection device according to claim 1, characterized in that: The holes on the special pipe (2) are only arranged on the semicircular surface above the special pipe (2) and cover the entire special pipe (2).

4. A goaf gas collection device according to claim 1, characterized in that: The special pipeline (2) is laid on the side of the air inlet chute and the return air chute of the coal mining face close to the goaf. The specific laying length of the special pipeline (2) is estimated based on the three-zone distribution of the goaf.

5. A goaf gas collection device according to claim 1, characterized in that: The transmission screw rod (8) has an outer diameter of 30 mm and a length of 2 m. The pitch of the protruding thread (11) of the transmission screw rod (8) is 5 cm. The transmission screw rod (8) can be spliced ​​and extended as needed. The end of the transmission screw rod (8) is provided with an external thread (15), and the tail is provided with an internal thread (16). The external thread (15) is matched with the tail internal thread (16), and the thread diameters are both 20 mm. The external thread (15) of the transmission screw rod (8) at the head end is connected to the bearing of the special pipe cover (1) at the end of the special pipe (2).

6. A goaf gas collection device according to claim 1, characterized in that: The tail of the transmission screw rod is provided with a gear a (9) for connecting with a power source for transmission.

7. A goaf gas collection device according to claim 5, characterized in that: The power source is a hand-cranked power source, comprising a gear b (21) matched with a gear a (9), and the gear b (21) is connected to a hand-cranked rocker (20); wherein the hand-cranked power source is arranged in a housing, a bearing b (18) is arranged between the transmission screw rod (8) and the housing, and a bearing c (19) is arranged between the hand-cranked rocker (20) and the housing.

8. A goaf gas collection device according to claim 1, characterized in that: The left capsule (3) and the right capsule (5) are respectively sleeved at the front and rear ends of the inner shell (13), and a filter screen (4) is provided on the inner shell (13) between the left capsule (3) and the right capsule (5), and the inner space of the filter screen (4) is an air chamber. The ends of the gas injection pipeline (7) are respectively connected to the left capsule (3) and the right capsule (5). When gas is injected, the gas first enters the inner shell (13) from the gas injection pipeline (7), and enters the outer capsule layer (12) through the inner shell hole (22), so that the capsule layer (12) swells and is fixed in the special pipeline (2).

9. A goaf gas collection device according to claim 1, characterized in that: The air extraction pipeline (6) is located above the air injection pipeline (7), and the air extraction pipeline (6) passes through the inner shell (13) to the air chamber.

10. A working method using the goaf gas collection device according to claim 1, characterized in that: Here are the steps: Step 1: Determine the laying length of the special pipeline (2) according to the distribution range of the three zones of the goaf, directly lay the special pipeline on the side of the air inlet chute and the return air chute of the coal mining face close to the goaf, and connect the special pipelines (2) with flanges. Install a special pipeline cover (1) at one end of the special pipeline (2) that penetrates into the goaf, install bearing a (14) in the special pipeline cover (1), and the bearing a (14) is fitted on the protruding external thread (15) of the head of the transmission screw rod (8). The transmission screw rod (8) is connected end to end through the head external thread (15) and the tail internal thread (16) to extend its length. During the installation process, the laying of the special pipeline (2) and the installation of the transmission screw rod (8) are carried out simultaneously until the laying length meets the actual production requirements of the mining area; When installing the last section of the transmission screw rod (8), the integrated air extraction device is fitted onto the transmission screw rod (8) through the spiral bayonet pipe (10), and a gear a (9) is welded at the end of the transmission screw rod (8) for transmission; Step 2: After the integrated air extraction device is installed, the right interface of the integrated air extraction device is connected to the corresponding devices in sequence, wherein the air injection pipeline (7) is connected to the compressed air system pipeline of the coal mine itself, the air extraction pipeline (6) is connected to the mine vacuum pump, and the connection end between the air injection pipeline (7) and the compressed air system pipeline is equipped with a tee pipe (23) and a gas pressure gauge (24); Step 3: After the special pipeline (2) and the integrated gas extraction device are fully installed, as the working face advances forward, the goaf (17) gradually collapses, and the special pipeline (2) is buried by the collapsed coal and gangue. When the progress of the working face reaches the three-zone measurement standard, measurement begins; during measurement, the integrated gas extraction device is sent into the goaf (17) by means of a hand-cranked transmission screw rod (8), and the moving distance of the integrated gas extraction device is recorded at the same time, so as to determine its position in the goaf (17); Step 4: Move the integrated air extraction device from the starting position to the deepest part of the goaf according to a certain sampling interval. The sampling interval is set according to needs. When the integrated air extraction device moves to the sampling position, it stops moving. Then, the three-way pipe valve b (26) of the coal mine compressed air system pipeline is opened. Gas is injected into the left capsule (3) and the right capsule (5) through the gas injection pipeline (7). The gas first enters the inner shell (13) through the gas injection pipeline (7), and then enters the capsule through the hole (22) on the surface of the inner shell (13), causing the capsule to swell. When the pressure gauge (24) connected to the capsule shows a reading of 0.5 atmospheres, the three-way pipe valve b (26) is closed to stop the gas supply. The capsule isolates the front and rear spaces of the special pipeline (2), and only forms a sealed air chamber between the capsules, so that the holes on the special pipeline (2) are The hole is connected to the goaf (17), and then the mining intrinsically safe negative pressure gas collector is opened to extract gas. The gas extracted during the extraction only comes from the goaf where the integrated gas extraction device is located. The extracted gas composition is detected using a portable gas detector. After the portable gas detector displays stable data, the gas at the location of the integrated gas extraction device is collected using an air bag. When the collection is completed, the location of the integrated gas extraction device in the goaf, the sampling time and other information are marked on the air bag; the gas in the capsule is released by opening the three-way pipe valve a (25) connected to the gas injection pipe (7), and then the hand-cranked joystick (20) is shaken to move the integrated gas extraction device to the next measuring point, and the above steps are repeated to extract gas and sample; finally, all the air bags are handed over to the ground for detection and analysis to obtain gas data at different locations in the goaf (17).

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