A device for nondestructive sampling and extraction of gas from a borehole

Abstract

The present application relates to a kind of drilling fixed-point gas nondestructive sampling and extraction device, belong to gas sampling technical field;Including drill rod, telescopic coal sample jar is fixedly arranged at the front end of drill rod, drill head is fixedly arranged at the front end of coal sample jar;Coal sample jar includes fixed shell and telescopic shell that are slidably connected, wherein fixed shell is fixedly connected with the front end of drill rod, telescopic shell is fixedly connected with drill head;Outside sampling port is provided at the front end of telescopic shell, sampling baffle is rotatably arranged in the inside of outside sampling port;Extraction mechanism is fixedly arranged at the rear end of fixed shell, extraction mechanism is arranged in the inside of the installation groove of the front end of drill rod, and extraction mechanism includes extraction tank, and extraction tank is communicated with the inside of coal sample jar;Solve the current gas sampling method prone to air leakage phenomenon, operation step is complicated, and the problem that sample needs to be taken back to ground laboratory.

Description

Technical Field

[0001] This invention belongs to the field of gas sampling technology, specifically relating to a non-destructive sampling and extraction device for borehole fixed-point gas sampling. Background Technology

[0002] Gas sampling, as a crucial component of coal mine safety supervision and production management, plays a vital role in ensuring miner safety and preventing gas explosions. With the continuous expansion of coal mining scale and the increasing complexity of working environments, the reliability and efficiency of gas sampling technology have gradually become a focus of industry attention. Currently, traditional gas sampling methods mainly rely on standardized sampling instruments and manual operation, and several problems still need to be addressed in practical applications. First, gas leakage is widespread. Due to the loose sealing rings of the sampling equipment, ambient gas is often introduced during operation, affecting the purity of the sampled gas. Second, the operation process is cumbersome and complex. Traditional sampling equipment requires skilled technicians to perform multiple connections, adjustments, and tests on-site, significantly increasing workload and time costs. Furthermore, the significant differences in working environments across different mines make operation even more difficult, hindering rapid deployment and standardized management.

[0003] Furthermore, existing technologies face challenges in equipment maintenance and safety hazards. Some sampling equipment has a complex structure, making repair inconvenient and prone to leaks or malfunctions; operation in harsh environments such as high temperature and high pressure further increases safety risks. Moreover, previous gas sampling methods required samples to be brought back to a surface laboratory for complex purification procedures before analysis. These problems limit the widespread adoption and effectiveness of gas sampling technology, necessitating new, efficient, safe, and convenient sampling solutions to meet the dual requirements of safety and efficiency in modern coal mines. Summary of the Invention

[0004] This invention overcomes the shortcomings of existing technologies and proposes a borehole-based fixed-point gas non-destructive sampling and extraction device; it solves the problems of current gas sampling methods being prone to gas leakage, cumbersome operation procedures, and the need to bring samples back to the ground laboratory.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution.

[0006] A borehole-based non-destructive gas sampling and extraction device includes a drill rod, a retractable coal sample container fixedly mounted at the front end of the drill rod, and a drill bit fixedly mounted at the front end of the coal sample container. The coal sample container includes a fixed shell and a retractable shell that are slidably connected to each other, wherein the fixed shell is fixedly connected to the front end of the drill rod, and the retractable shell is fixedly connected to the drill bit. An outer sampling port is provided at the front end of the retractable shell, and a sampling baffle is rotatably mounted inside the outer sampling port. An extraction mechanism is fixedly mounted at the rear end of the fixed shell, and the extraction mechanism is located inside the mounting groove at the front end of the drill rod. The extraction mechanism includes an extraction tank, which is connected to the interior of the coal sample container.

[0007] Furthermore, the fixed shell is a cylindrical structure with an open front end, and the telescopic shell is a cylindrical structure with an open rear end, with the front opening of the fixed shell slidably inserted into the rear opening of the telescopic shell.

[0008] Furthermore, a guide groove is provided on the outer wall of the fixed shell, and a guide block is fixedly provided on the inner wall of the telescopic shell, with the guide block slidingly engaging inside the guide groove; a sealing ring is also fixedly provided at the front end of the outer wall of the fixed shell, with the sealing ring pressed between the inner wall of the telescopic shell and the outer wall of the fixed shell.

[0009] Furthermore, a bidirectional electric cylinder is installed inside the coal sample container, with its two telescopic ends fixedly connected to the telescopic shell and the fixed shell, respectively.

[0010] Furthermore, a motor is fixedly installed at the front end of the telescopic shell, and the sampling baffle is fixedly installed at the output shaft of the motor, with an inner sampling port provided on the sampling baffle.

[0011] Furthermore, a drain pipe is fixedly inserted at the center of the rear side wall of the fixed shell. The drain pipe is a flexible tube, with a counterweight fixedly sleeved at one inner end and a solenoid valve installed at the outer end.

[0012] Furthermore, five extraction tanks are fixedly installed on the rear end face of the fixed shell, namely extraction tank No. 1, extraction tank No. 2, extraction tank No. 3, extraction tank No. 4 and extraction tank No. 5. The five extraction tanks are fixedly connected to each other by a fixed plate. The extraction tank is a circular cylindrical structure with openings at both the front and rear ends. The front end of the extraction tank is fixedly connected to the rear end face of the fixed shell, and the front opening of the extraction tank is connected to the inside of the fixed shell.

[0013] Furthermore, each extraction tank has an electric push rod installed inside its rear opening. The cylinder of the electric push rod is fixedly connected to the rear opening of the extraction tank, and the telescopic rod of the electric push rod extends into the extraction tank. A piston block is fixedly installed at one end of the telescopic rod of each electric push rod.

[0014] Furthermore, extraction tank No. 1 contains extraction solution No. 1, which is a methyl diethanolamine solution; extraction tank No. 2 contains extraction solution No. 2, which is an organic solution of ethane; extraction tank No. 3 contains extraction solution No. 3, which is a 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt solution; extraction tank No. 4 contains extraction solution No. 4, which is a cobalt porphyrin complex solution; and extraction tank No. 5 serves as a backup tank.

[0015] Furthermore, an explosion-proof battery and a control module are installed inside the mounting slot at the front end of the drill pipe.

[0016] The beneficial effects of this invention compared to the prior art are as follows:

[0017] 1. This device achieves a breakthrough in the high-efficiency on-site purification of methane gas. Methane gas collected from underground can undergo extraction processes within the equipment to remove water and impurities, outputting high-purity target methane components. This lays the foundation for subsequent rapid and accurate analysis. This completely eliminates the reliance on specialized laboratories and long waiting times, elevating the efficiency of methane analysis to an unprecedented level.

[0018] 2. One of the biggest drawbacks of traditional gas sampling techniques is the susceptibility to gas leakage. Whether it's loose connections during operation, inadequate sealing, or contamination of the sample during transportation and processing, external air can seep in, diluting the gas concentration and providing incorrect monitoring data. This invention prioritizes "zero leakage" from the outset, employing integrated, modular precision sealing technology combined with an advanced self-locking connection and propulsion system. Throughout the entire sampling and purification process, the gas flow path remains highly sealed, ensuring the purity of the sampled gas and preventing any interference with its original concentration from external factors. This superior sealing performance fundamentally guarantees the authenticity and accuracy of gas detection data, providing a more reliable basis for mine safety decisions.

[0019] 3. Traditional sampling methods, due to variations in human operation, often struggle to guarantee standardization and repeatability of each sample, thus affecting data comparability. Directional gas sampling devices, with their high degree of automation and pre-programmed procedures, ensure that every sampling and purification process strictly adheres to uniform standards and parameters. The probability of operators directly contacting gas is reduced, avoiding accidents caused by human error. Simultaneously, due to their ease of operation and the absence of long-term on-site supervision by specialized personnel, manpower input is significantly reduced, fundamentally lowering safety issues caused by personnel fatigue or negligence, and saving enterprises considerable human resource costs. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a three-dimensional schematic diagram of the present invention after the drill rod has been removed;

[0023] Figure 3 This is a side view of the present invention after removing the drill rod, control module, and explosion-proof battery;

[0024] Figure 4 yes Figure 3 A three-dimensional schematic diagram of the coal sample container after it has been partially cut open.

[0025] Figure 5 This is a schematic diagram showing the connection between the partially cut coal sample container and the bidirectional electric cylinder, drill bit, sampling baffle, and motor.

[0026] Figure 6 This is a schematic diagram showing the connection between the bidirectional electric cylinder, the sampling baffle, and the motor.

[0027] Figure 7 This is a schematic diagram of the extraction mechanism;

[0028] Figure 8 This is a schematic diagram of the telescopic shell structure. Figure 1 ;

[0029] Figure 9 This is a schematic diagram of the telescopic shell structure. Figure 2 ;

[0030] Figure 10 This is a schematic diagram of a fixed shell structure. Figure 1 ;

[0031] Figure 11 This is a schematic diagram of a fixed shell structure. Figure 2 ;

[0032] Figure 12 This is a schematic diagram showing the connection between the motor and the sampling baffle;

[0033] Figure 13 This is a schematic diagram of the extraction tank;

[0034] Figure 14 This is a schematic diagram showing the connection between the partially dissected extraction tank and the electric actuator.

[0035] Among them, 1 is the drill rod, 2 is the coal sample container, 3 is the drill bit, 4 is the fixed shell, 5 is the telescopic shell, 6 is the outer sampling port, 7 is the sampling baffle, 8 is the extraction tank, 9 is the guide groove, 10 is the guide block, 11 is the sealing ring, 12 is the bidirectional electric cylinder, 13 is the support cover, 14 is the motor, 15 is the inner sampling port, 16 is the drain pipe, 17 is the solenoid valve, 18 is the counterweight, 19 is the electric push rod, 20 is the control module, and 21 is the explosion-proof battery. Detailed Implementation

[0036] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0037] like Figure 1 As shown in Figure 14, the present invention provides a borehole-based fixed-point gas non-destructive sampling and extraction device, including a drill rod 1, a retractable coal sample container 2 fixedly installed at the front end of the drill rod 1, and a drill bit 3 fixedly installed at the front end of the coal sample container 2; the coal sample container 2 includes a fixed shell 4 and a retractable shell 5 slidably connected to each other, wherein the fixed shell 4 is fixedly connected to the front end of the drill rod 1, and the retractable shell 5 is fixedly connected to the drill bit 3; an outer sampling port 6 is provided at the front end of the retractable shell 5, and a sampling baffle 7 is rotatably installed inside the outer sampling port 6; an extraction mechanism is fixedly installed at the rear end of the fixed shell 4, the extraction mechanism is installed inside the mounting groove at the front end of the drill rod 1, and the extraction mechanism includes an extraction tank 8, which is connected to the inside of the coal sample container 2.

[0038] The fixed shell 4 is a cylindrical structure with an open front end, and the telescopic shell 5 is a cylindrical structure with an open rear end. The front opening of the fixed shell 4 is slidably inserted into the rear opening of the telescopic shell 5. Three circularly arranged guide grooves 9 are provided on the outer wall of the fixed shell 4, with the length direction of the guide grooves 9 parallel to the axis of the fixed shell 4. Three circularly arranged guide blocks 10 are fixedly installed on the inner wall of the telescopic shell 5. The four guide blocks 10 are slidably engaged within the three guide grooves 9, allowing the telescopic shell 5 and the fixed shell 4 to slide relative to each other and rotate synchronously. A sealing ring 11 is also fixedly installed at the front end of the outer wall of the fixed shell 4, pressing between the inner wall of the telescopic shell 5 and the outer wall of the fixed shell 4 to ensure a tight seal between the telescopic shell 5 and the fixed shell 4.

[0039] A bidirectional electric cylinder 12 is installed at the internal axis of the coal sample container 2, with its axis coinciding with that of the coal sample container 2. A support cover 13 is fixedly installed at each of the two telescopic ends of the bidirectional electric cylinder 12. The front support cover 13 is fixedly installed at the front end of the telescopic shell 5, and the rear support cover 13 is fixedly installed at the rear end of the fixed shell 4. The telescopic movement of the coal sample container 2 is controlled by the synchronous extension or retraction of the two telescopic ends of the bidirectional electric cylinder 12. Grooves are provided on the support covers 13 to ensure that the material inside the coal sample container 2 can pass smoothly through the two support covers 13.

[0040] A motor 14 is fixedly installed at the front end of the telescopic shell 5. The motor 14 is located inside the front support cover 13. The sampling baffle 7 is fixedly installed at the output shaft of the motor 14. The motor 14 controls the rotation of the sampling baffle 7. The sampling baffle 7 is a circular plate structure and is kept in close contact with the front end of the telescopic shell 5. An inner sampling port 15 is provided on the sampling baffle 7. When the inner sampling port 15 on the sampling baffle 7 rotates to coincide with the outer sampling port 6 at the front end of the telescopic shell 5, the front end of the telescopic shell 5 is in an open state, and coal samples and gas can enter the coal sample tank 2. When the inner sampling port 15 on the sampling baffle 7 rotates to be misaligned with the outer sampling port 6 at the front end of the telescopic shell 5, the front end of the telescopic shell 5 is in a closed state, and the coal sample tank 2 remains closed.

[0041] A drain pipe 16 is fixedly inserted into the center of the rear side wall of the fixed shell 4. The drain pipe 16 is a flexible tube, with a counterweight 18 fixedly sleeved at one inner end and a solenoid valve 17 installed at the outer end. Because the counterweight 18 is fixedly sleeved at one inner end of the drain pipe 16, under the action of the weight of the counterweight 18, the inner end of the drain pipe 16 is always located at the lowest point inside the fixed shell 4, so that the liquid inside the fixed shell 4 can be discharged outward along the drain pipe 16.

[0042] Five extraction tanks 8, designated as Extraction Tank No. 1, Extraction Tank No. 2, Extraction Tank No. 3, Extraction Tank No. 4, and Extraction Tank No. 5, are fixedly mounted on the rear end face of the fixed shell 4. The five extraction tanks 8 are connected by a fixed plate and arranged in a circular array around the axis of the coal sample tank 2. Each extraction tank 8 is a cylindrical structure with openings at both ends. The axis of the extraction tank 8 is parallel to the axis of the coal sample tank 2. The front end of the extraction tank 8 is fixedly connected to the rear end face of the fixed shell 4, and the front opening of the extraction tank 8 communicates with the interior of the fixed shell 4. An electric push rod 19 is installed inside the rear opening of each extraction tank 8. The cylinder of the electric push rod 19 is fixedly connected to the rear opening of the extraction tank 8, and the telescopic rod of the electric push rod 19 extends into the interior of the extraction tank 8. A cylindrical piston block is fixedly mounted at one end of the telescopic rod of each electric push rod 19, and the outer wall of the piston block slides in contact with the inner wall of the extraction tank 8.

[0043] Extraction tank No. 1 contains Extraction Solution No. 1, which is a methyldiethanolamine solution; Extraction tank No. 2 contains Extraction Solution No. 2, which is an organic solution of ethane; Extraction tank No. 3 contains Extraction Solution No. 3, which is a 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt solution; Extraction tank No. 4 contains Extraction Solution No. 4, which is a cobalt porphyrin complex solution; Extraction tank No. 5 serves as a backup tank for emergencies or further fine processing.

[0044] An explosion-proof battery 21 and a control module 20 are also installed inside the mounting slot at the front end of the drill pipe 1. The explosion-proof battery 21 and the control module 20 are electrically connected to the bidirectional electric cylinder 12, the motor 14, the electric push rod 19, and the solenoid valve 17.

[0045] The working principle of this invention is as follows:

[0046] S1, control the drilling rig to work. The drill rod 1 drives the drill bit 3 through the coal sample container 2 to drill into the coal seam according to predetermined parameters. A predetermined drilling time h1 is set. When the drilling time reaches the preset value h1, it indicates that the drill bit 3 has reached the target sampling depth. At this time, the control module 20 controls the motor 14 to start rotating. The motor 14 drives the sampling baffle 7 to rotate, so that the inner sampling port 15 on the sampling baffle 7 rotates to coincide with the outer sampling port 6 at the front end of the telescopic shell 5, and the front end of the coal sample container 2 is in the open state.

[0047] S2, after the front end of the coal sample container 2 is opened, the drill rod 1 continues to drill. The coal dust generated during the drilling process will enter the interior of the coal sample container 2 to collect methane gas from a specific coal seam depth. After a collection time of h2, the control module 20 controls the motor 14 to rotate in the opposite direction, causing the inner sampling port 15 on the sampling baffle 7 to rotate to be misaligned with the outer sampling port 6 at the front end of the telescopic shell 5, so that the coal sample container 2 is in a closed state.

[0048] S3. After sealing the coal sample container 2, the drilling rig enters the retraction procedure. At this time, the drill rod 1 will be withdrawn from the coal seam by rotation, and the coal sample container 2 will be withdrawn synchronously with the drill rod 1.

[0049] S4, during the synchronous withdrawal of coal sample container 2 along with drill rod 1, the gas collected inside coal sample container 2 is extracted and purified to obtain high-purity methane gas. The extraction and purification process is the key to achieving gas purification, and it is divided into multiple extraction stages to remove impurities from the gas mixture one by one. The entire extraction process is precisely controlled by control module 20.

[0050] S4.1, the electric push rod 19 inside the rear opening of the No. 1 extraction tank extends, causing the internal space of the No. 1 extraction tank to gradually decrease, thereby injecting the No. 1 extractant into the coal sample tank 2. Since the coal sample tank 2 is withdrawn from the coal seam by rotating along with the drill rod 1, the gas inside the coal sample tank 2 is fully mixed with the No. 1 extractant for a mixing time of h3. Methyldiethanolamine is used to absorb carbon dioxide and hydrogen sulfide from the gas. Then, the solenoid valve 17 on the drain pipe 16 is opened, and simultaneously, the two telescopic ends of the bidirectional electric cylinder 12 are synchronously contracted, causing the coal sample tank 2 to begin to contract. The internal space of the coal sample tank 2 gradually decreases, and the internal gas pressure gradually increases, thereby gradually discharging the No. 1 extractant that has absorbed gas from the coal sample tank 2 outward through the drain pipe 16. Then, the solenoid valve 17 on the drain pipe 16 is closed, and the two telescopic ends of the bidirectional electric cylinder 12 are synchronously extended again, causing the coal sample tank 2 to return to its maximum volume.

[0051] S4.2, the electric push rod 19 inside the rear opening of the No. 2 extraction tank extends, causing the internal space of the No. 2 extraction tank to gradually decrease, thereby injecting the No. 2 extractant into the coal sample tank 2. Since the coal sample tank 2 is withdrawn from the coal seam by rotating along with the drill rod 1, the gas inside the coal sample tank 2 is fully mixed with the No. 2 extractant for a mixing time of h4. An organic solution of ethane is used to absorb nitrogen from the methane gas. Then, the solenoid valve 17 on the drain pipe 16 is opened, and simultaneously, the two telescopic ends of the bidirectional electric cylinder 12 are synchronously contracted, causing the coal sample tank 2 to begin to contract. The internal space of the coal sample tank 2 gradually decreases, and the internal gas pressure gradually increases, thereby gradually discharging the No. 2 extractant that has absorbed gas from the coal sample tank 2 outwards through the drain pipe 16. Then, the solenoid valve 17 on the drain pipe 16 is closed, and the two telescopic ends of the bidirectional electric cylinder 12 are synchronously extended again, causing the coal sample tank 2 to return to its maximum volume.

[0052] S4.3, the electric push rod 19 inside the rear opening of the No. 3 extraction tank extends, causing the internal space of the No. 3 extraction tank to gradually decrease, thereby injecting the No. 3 extraction liquid inside the No. 3 extraction tank into the coal sample tank 2. Since the coal sample tank 2 is withdrawn from the coal seam by rotating along with the drill rod 1, the gas inside the coal sample tank 2 is fully mixed with the No. 3 extraction liquid, and the mixing time is h5. The 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt solution is used to adsorb light alkanes such as ethane, propane, and butane in the gas. Then, the solenoid valve 17 on the drain pipe 16 is opened, and the two telescopic ends of the bidirectional electric cylinder 12 are simultaneously controlled to contract synchronously, thereby causing the coal sample tank 2 to begin to contract. The internal space of the coal sample tank 2 gradually decreases, and the internal gas pressure gradually increases, thereby gradually discharging the No. 3 extraction liquid that has absorbed gas inside the coal sample tank 2 from the drain pipe 16. Then, the solenoid valve 17 on the drain pipe 16 is closed, and the two telescopic ends of the bidirectional electric cylinder 12 extend synchronously again, so that the coal sample container 2 returns to its maximum volume.

[0053] S4.4, the electric push rod 19 inside the rear opening of the No. 4 extraction tank extends, causing the internal space of the No. 4 extraction tank to gradually decrease, thereby injecting the No. 4 extractant into the coal sample tank 2. Since the coal sample tank 2 is withdrawn from the coal seam by rotating along with the drill rod 1, the gas inside the coal sample tank 2 is fully mixed with the No. 4 extractant for a mixing time of h6. A cobalt porphyrin complex solution is used to absorb oxygen from the gas. Then, the solenoid valve 17 on the drain pipe 16 is opened, and simultaneously, the two telescopic ends of the bidirectional electric cylinder 12 are synchronously contracted, causing the coal sample tank 2 to begin to contract. The internal space of the coal sample tank 2 gradually decreases, and the internal gas pressure gradually increases, thereby gradually discharging the No. 4 extractant that has absorbed gas from the coal sample tank 2 outwards through the drain pipe 16. Then, the solenoid valve 17 on the drain pipe 16 is closed, and the two telescopic ends of the bidirectional electric cylinder 12 are synchronously extended again, causing the coal sample tank 2 to return to its maximum volume.

[0054] Through the multi-stage extraction process described above, the methane gas inside coal sample container 2 is highly purified, ultimately yielding high-purity methane gas. These pure methane samples can be used for subsequent methane content determination and precise analysis of combustible methane components, thereby greatly improving the accuracy and reliability of the analytical results.

[0055] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A borehole-based fixed-point gas non-destructive sampling and extraction device, characterized in that: The system includes a drill rod (1), a retractable coal sample container (2) fixedly mounted at the front end of the drill rod (1), and a drill bit (3) fixedly mounted at the front end of the coal sample container (2). The coal sample container (2) includes a fixed shell (4) and a telescopic shell (5) that are slidably connected to each other. The fixed shell (4) is fixedly connected to the front end of the drill rod (1), and the telescopic shell (5) is fixedly connected to the drill bit (3). An outer sampling port (6) is provided at the front end of the telescopic shell (5), and a sampling baffle (7) is rotatably mounted inside the outer sampling port (6). An extraction mechanism is fixedly mounted at the rear end of the fixed shell (4). The extraction mechanism is located inside the mounting groove at the front end of the drill rod (1). The extraction mechanism includes an extraction tank (8), which is connected to the inside of the coal sample container (2). The fixed shell (4) is a cylindrical structure with an open front end, and the telescopic shell (5) is a cylindrical structure with an open rear end. The front opening of the fixed shell (4) is slidably inserted. The telescopic shell (5) is connected to the rear opening inside; a guide groove (9) is provided on the outer wall of the fixed shell (4), and a guide block (10) is fixedly provided on the inner wall of the telescopic shell (5). The guide block (10) is slidably engaged in the guide groove (9); a sealing ring (11) is also fixedly provided at the front end of the outer wall of the fixed shell (4). The sealing ring (11) is pressed between the inner wall of the telescopic shell (5) and the outer wall of the fixed shell (4); a two-way electric cylinder (12) is also provided inside the coal sample tank (2). The two telescopic ends of the two-way electric cylinder (12) are fixedly connected to the telescopic shell (5) and the fixed shell (4) respectively; a drain pipe (16) is fixedly inserted at the center of the rear side wall of the fixed shell (4). The drain pipe (16) is a flexible hose. A counterweight block (18) is fixedly sleeved on one inner end of the drain pipe (16), and a solenoid valve (17) is provided on one outer end of the drain pipe (16).

2. The borehole-based fixed-point gas non-destructive sampling and extraction device according to claim 1, characterized in that: A motor (14) is fixedly installed at the front end of the telescopic shell (5), and a sampling baffle (7) is fixedly installed at the output shaft of the motor (14). An inner sampling port (15) is provided on the sampling baffle (7).

3. The borehole-based fixed-point gas non-destructive sampling and extraction device according to claim 1, characterized in that: Five extraction tanks (8) are fixedly installed on the rear end face of the fixed shell (4), namely extraction tank No. 1, extraction tank No. 2, extraction tank No. 3, extraction tank No. 4 and extraction tank No.

5. The five extraction tanks (8) are fixedly connected to each other by a fixed plate. The extraction tank (8) is a circular cylindrical structure with openings at both ends. The front end of the extraction tank (8) is fixedly connected to the rear end face of the fixed shell (4), and the front opening of the extraction tank (8) is connected to the inside of the fixed shell (4).

4. The borehole-based fixed-point gas non-destructive sampling and extraction device according to claim 3, characterized in that: Each extraction tank (8) has an electric push rod (19) installed inside the rear opening. The cylinder of the electric push rod (19) is fixedly connected to the rear opening of the extraction tank (8). The telescopic rod of the electric push rod (19) extends into the extraction tank (8). A piston block is fixedly installed at one end of the telescopic rod of each electric push rod (19).

5. The borehole-based fixed-point gas non-destructive sampling and extraction device according to claim 1, characterized in that: An explosion-proof battery (21) and a control module (20) are also installed inside the mounting slot at the front end of the drill pipe (1).

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