A gas leakage detection and positioning device for coal mine gas extraction drilling

Abstract

The invention relates to a gas leakage detection and positioning device for coal mine gas extraction drilling holes in the field of coal mine rock formation drilling. By installing a front slide cylinder with a first controllable air bag and a rear slide cylinder with a second controllable air bag, and cooperating with a magnet ring and an electromagnetic coil, a detection mechanism can efficiently move in an extraction drilling hole, and is convenient for walking and detecting in extraction drilling holes with different inclination angles; at the same time, by using a first acoustic wave positioning sensor and a second acoustic wave positioning sensor, the detection mechanism can quickly approach the leakage port position, replacing the traditional detection device's section-by-section detection method of the extraction drilling hole, thereby improving the detection efficiency; in addition, by using a first infrared distance sensor arranged opposite to a storage mechanism, the leakage port is quickly located, thereby overcoming the problem of low positioning accuracy caused by the traditional detection device using the cable release amount to locate the leakage port position, thereby improving the positioning accuracy.

Description

Technical Field

[0001] The invention relates to a gas leakage locating device, in particular to a coal mine gas extraction drilling gas leakage detection and locating device applied to the field of coal mine rock stratum drilling. Background Art

[0002] The leakage holes on the inner wall of the borehole need to be sealed, mainly to deal with local leakage problems that may occur during the extraction process of the borehole, especially when the overall structure remains stable and the leakage hole is small. Although such local leakage will not affect the safety of the overall structure, it still needs to be dealt with in time to prevent the problem from expanding. The sealing measures are achieved by using specific inert materials, chemical slurry or controllable expansion plugging agents, etc., using the grouting pressure to make it expand and fit tightly to the borehole wall, effectively sealing the leak.

[0003] In the extraction drilling operation, due to the complex geological conditions, there are often multiple potential leaks in different locations inside the borehole. To ensure the accuracy and efficiency of the plugging work, the first task is to accurately locate the location of these leaks. At the same time, given that the leakage volume of some leaks may be relatively small and does not reach the threshold that must be plugged, it is necessary to scientifically determine whether the leak meets the plugging standards before plugging. For this reason, it is particularly important to use professional gas leak positioning detection equipment to accurately and quantitatively detect the leak location and leak speed.

[0004] The existing Chinese patent with publication number CN115263245B discloses a gas leakage detection and positioning device for coal mine gas extraction boreholes. The device solves the problems of inaccurate detection of gas leakage positions in gas extraction boreholes, unclear specific leakage directions, poor sealing when detecting leakage, and inaccurate movement of the detection device in the borehole. A gas leakage detection and positioning device for coal mine gas extraction boreholes, including a winch; two traction ropes are wound around the winch, and a detection component is fixedly connected to the lower end of the traction rope, and a partition isolation component and a sealing assembly are provided on the detection component. The invention uses two parallel traction ropes to vertically and steadily place the detection component into the gas extraction borehole, and divides the space between the detection component and the borehole wall into eight detection areas through the partition isolation component, and cooperates with the sealing assembly to seal the eight detection areas, so as to realize the detection of borehole gas leakage during the movement of the detection component.

[0005] The above patent releases the detection component through a traction rope, and determines the leakage position and leakage speed through the winding amount of the traction rope and the detection of the detection tube. The entire extraction borehole needs to be detected section by section, regardless of whether a leakage occurs at that location. This results in low detection efficiency and a long time consumption. It is not suitable for leakage detection of long-length extraction boreholes. At the same time, gas extraction drilling includes not only vertical drilling but also horizontal drilling. The use of a traction rope cannot drive the detection component to move in the horizontal extraction borehole. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the existing extraction drilling gas leakage detection and positioning device adopts a segment-by-segment detection method to find the leakage position, which is inefficient.

[0007] In order to solve the above problems, the present invention provides a gas leakage detection and positioning device for coal mine gas extraction drilling, comprising a detection mechanism and a storage mechanism installed at the opening position of the extraction drilling; the detection mechanism comprises a front slide cylinder and a rear slide cylinder which are slidably nested with each other, a magnet ring is nested at the end of the front slide cylinder, and an electromagnetic coil distributed along its axial direction is nested in the shell wall of the rear slide cylinder, when the electromagnetic coil is energized, the magnetic field generated reacts magnetically with the magnet ring, so that the front slide cylinder and the rear slide cylinder move relative to each other;

[0008] A first controllable airbag is installed at the front end of the front slide, and a second controllable airbag is installed at the rear end of the rear slide. The first controllable airbag and the second controllable airbag have the same structure, and both can achieve expansion and contraction. When the two are expanded, they abut against the inner wall of the extraction borehole, and when the two are expanded at the same time, a closed cavity is formed between the two and the inner wall of the extraction borehole.

[0009] The front end of the first controllable airbag is fixedly connected with a first sonic positioning sensor, and the rear end thereof is fixedly connected with a second sonic positioning sensor. The rear slide is fixedly connected with a gas concentration sensor, and the rear slide is equipped with a first infrared distance sensor arranged opposite to the storage mechanism.

[0010] In the above-mentioned coal mine gas extraction borehole gas leakage detection and positioning device, the rapid positioning of the extraction borehole leakage port and the leakage speed detection are achieved through the acoustic wave positioning sensor, the gas concentration sensor and a pair of controllable air bags.

[0011] As a further improvement of the present invention, a third sonic positioning sensor arranged opposite to the second sonic positioning sensor is fixedly connected to the inner wall of the second controllable airbag, and the third sonic positioning sensor is used to detect the distance from the second controllable airbag to the right end of the leakage port. A second infrared distance sensor arranged opposite to the front slide is fixedly connected to the second controllable airbag, and the second infrared distance sensor is used to detect the relative movement distance between the front slide and the rear slide.

[0012] As a further improvement of the present invention, the first controllable airbag includes a sliding plate fixedly connected to the front end of the front slide, and the airbag body is nested in the middle; the inside of the airbag body is connected to the air pump through a pipeline, and the side away from the air pump is connected to the air storage bag through an electromagnetic valve.

[0013] As a further improvement of the present invention, the sliding disk is annular in structure, and a ring-shaped cavity is provided in the middle thereof for accommodating the airbag body, the air storage bag, the air pump and the solenoid valve, and conical portions with right-angled trapezoidal cross-sections are provided at the edges of both sides of the sliding disk.

[0014] As a further improvement of the present invention, both the airbag body and the air storage bag are annular airbags, and the circumferential outer wall of the airbag body is provided with an inwardly recessed portion, and the inner recessed portion is recessed inwardly when the airbag body is not inflated.

[0015] As a further improvement of the present invention, the outer wall of the second controllable airbag is fixedly connected to an execution end controller, the storage mechanism includes a fixed cylinder nested in the opening position of the extraction drilling hole, and the fixed cylinder is fixedly connected to a monitoring end controller. Both the execution end controller and the monitoring end controller include a communication module for wirelessly controlling the detection mechanism.

[0016] As a further improvement of the present invention, the fixed cylinder is a hollow cylindrical structure with openings at both ends. The outer end opening of the fixed cylinder is connected to the external negative pressure suction pipe. A reflective plate is fixedly connected to the central opening of the fixed cylinder, and the reflective plate is arranged opposite to the first infrared distance sensor.

[0017] As a further improvement of the present invention, the monitoring end controller also includes an acoustic wave feature collection module and an acoustic wave feature analysis module. The first acoustic wave positioning sensor, the second acoustic wave positioning sensor and the third acoustic wave positioning sensor are all connected to the acoustic wave feature collection module through the communication module. The acoustic wave feature analysis module is used to analyze the acoustic wave features in the extraction borehole and match the acoustic wave features of the leakage port position, thereby realizing the positioning of the leakage port position and the analysis of the leakage port opening type.

[0018] As a further improvement of the present invention, when detecting the leakage position of the extraction borehole, the following steps are included:

[0019] Step 1: Place the detection mechanism into the extraction borehole and install the storage mechanism at the opening of the extraction borehole;

[0020] Step 2: Start the first acoustic wave positioning sensor to perform acoustic wave positioning on the leakage port in the extraction borehole. According to the position of the leakage port located by the acoustic wave, the detection mechanism moves in the extraction borehole to approach the position of the leakage port.

[0021] Step 3: When the first acoustic wave positioning sensor is close to the leak, the second acoustic wave positioning sensor is started, and the detection mechanism continues to move until the second acoustic wave positioning sensor moves to the front side of the leak;

[0022] Step 4: Control the first controllable airbag and the second controllable airbag to expand, so that the first controllable airbag, the second controllable airbag and the inner wall of the extraction borehole form an enclosed sealed cavity;

[0023] Step 5: Start the gas concentration sensor and the first infrared distance sensor to detect the change of gas concentration within the set detection time, and then calculate the gas leakage speed of the current leakage port, and locate the distance through the first infrared distance sensor;

[0024] Step six, repeat steps one to five to locate the leakage position and detect the leakage speed of the entire extraction borehole.

[0025] As a further improvement of the present invention, the walking control process of the detection mechanism includes the following steps:

[0026] S1, controlling the second controllable airbag to expand and the first controllable airbag to contract;

[0027] S2, start the electromagnetic coil, the electromagnetic coil generates a magnetic field to push the front slide wrapped with the magnet ring to move forward;

[0028] S3, after the front slide reaches the maximum forward stroke, the electromagnetic coil is closed to control the first controllable airbag to expand and the second controllable airbag to contract;

[0029] S4, start the electromagnetic coil, and the rear slide moves toward the front slide until it is re-engaged with the front slide. At this time, the entire detection mechanism moves forward;

[0030] S5, repeating S1 to S4, alternately controlling the expansion and contraction of the first controllable airbag and the second controllable airbag, and cooperating with the electromagnetic coil to realize the movement of the detection mechanism.

[0031] To summarize, the present invention is equipped with a front slide cylinder with a first controllable airbag and a rear slide cylinder with a second controllable airbag, and cooperates with a magnet ring and an electromagnetic coil, so that the detection mechanism can move efficiently in the extraction borehole, which is convenient for walking and detecting in the extraction boreholes with different inclination angles; at the same time, the first acoustic wave positioning sensor and the second acoustic wave positioning sensor are used to enable the detection mechanism to quickly approach the leakage position, replacing the traditional detection device's section-by-section detection method of the extraction borehole, thereby improving the detection efficiency; in addition, the leakage port is quickly located by using the first infrared distance sensor arranged opposite to the storage mechanism, thereby overcoming the problem of low positioning accuracy caused by the traditional detection device using the cable release amount to locate the leakage position, thereby improving the positioning accuracy; in addition, the first controllable airbag and the second controllable sealing chamber are used to enclose and seal the part of the extraction borehole at the leakage position, and the gas concentration sensor is used to measure the leakage speed at the leakage position, thereby facilitating the judgment of whether the leakage port reaches the standard that needs to be blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of installation in the extraction borehole for this application;

[0033] Figure 2 It is a cross-sectional structural schematic diagram of this application;

[0034] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0035] Figure 4 This is a schematic diagram of the explosion assembly structure of the front slide and the rear slide in this application;

[0036] Figure 5 It is a schematic cross-sectional structure diagram of the first controllable airbag in the present application;

[0037] Figure 6 This is a schematic diagram of the explosion assembly structure of the first controllable airbag in this application;

[0038] Figure 7 A flow chart of the detection steps when performing a leak detection;

[0039] Figure 8 It is a schematic diagram of the state of the detection mechanism when walking;

[0040] Fig. 9 It is a schematic diagram of the walking control process of the detection mechanism;

[0041] Fig.10 This is a schematic diagram of the positions of the first controllable airbag and the second controllable airbag when the leakage opening is in the shape of a long slit.

[0042] Description of the numbers in the figure:

[0043] 1. Detection mechanism; 2. Storage mechanism; 3. Front slide; 301. Axial slider; 4. Magnet ring; 5. Rear slide; 501. Axial slide groove; 6. Electromagnetic coil; 7. First controllable airbag; 8. Second controllable airbag; 9. First sonic positioning sensor; 10. Second sonic positioning sensor; 11. Gas concentration sensor; 12. First infrared distance sensor; 13. Execution end controller; 14. Fixed cylinder; 15. Reflection plate; 16. Monitoring end controller; 17. Sliding disk; 1701. Annular cavity; 1702. Conical part; 18. Airbag body; 1801. Inner recess; 19. Air storage bag; 20. Air pump; 21. Electromagnetic valve; 22. Third sonic positioning sensor; 23. Second infrared distance sensor. DETAILED DESCRIPTION

[0044] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0045] The first implementation method:

[0046] Figure 1-9A gas leakage detection and positioning device for coal mine gas extraction drilling is shown, comprising a detection mechanism 1 and a storage mechanism 2 installed at the opening position of the extraction drilling hole; the detection mechanism 1 comprises a front slide 3 and a rear slide 5 which are slidably nested with each other, a magnet ring 4 is nested at the end of the front slide 3, and an electromagnetic coil 6 distributed along its axial direction is nested in the shell wall of the rear slide 5. When the electromagnetic coil 6 is energized, the magnetic field generated reacts with the magnet ring 4 to cause the front slide 3 and the rear slide 5 to move relative to each other;

[0047] A first controllable airbag 7 is installed at the front end of the front slide 3, and a second controllable airbag 8 is installed at the rear end of the rear slide 5. The first controllable airbag 7 and the second controllable airbag 8 have the same structure, and both can achieve expansion and contraction. When the two are expanded, they abut against the inner wall of the extraction borehole, and when the two are expanded at the same time, an enclosed closed cavity is formed between the two and the inner wall of the extraction borehole;

[0048] A first sonic positioning sensor 9 is fixedly connected to the front end of the first controllable airbag 7, and a second sonic positioning sensor 10 is fixedly connected to the rear end thereof. A gas concentration sensor 11 is fixedly connected to the rear slide 5, and a first infrared distance sensor 12 arranged opposite to the storage mechanism 2 is installed on the rear slide 5.

[0049] For details, please refer to Figure 7 , when conducting the detection of the leakage position of the extraction borehole, the following steps are included:

[0050] Step 1: Place the detection mechanism 1 into the extraction borehole, and install the storage mechanism 2 at the opening of the extraction borehole;

[0051] Step 2: Start the first acoustic wave positioning sensor 9 to perform acoustic wave positioning on the leakage port in the extraction borehole. According to the leakage port position located by the acoustic wave, the detection mechanism 1 moves in the extraction borehole to approach the leakage port position.

[0052] Step 3: When the first acoustic wave positioning sensor 9 is close to the leaking port, the second acoustic wave positioning sensor 10 is started, and the detection mechanism 1 continues to move until the second acoustic wave positioning sensor 10 moves to the front side of the leaking port;

[0053] Step 4: Control the first controllable airbag 7 and the second controllable airbag 8 to expand, so that the first controllable airbag 7, the second controllable airbag 8 and the inner wall of the extraction borehole form an enclosed sealed cavity;

[0054] Step 5: Start the gas concentration sensor 11 and the first infrared distance sensor 12 to detect the change of gas concentration within the set detection time, and then calculate the gas leakage speed of the current leakage port, and perform distance positioning through the first infrared distance sensor 12;

[0055] Step six, repeat steps one to five to locate the leakage position and detect the leakage speed of the entire extraction borehole.

[0056] For further explanation, please refer to Figure 8 and Fig. 9 , the walking control process of the detection mechanism 1 includes the following steps:

[0057] S1, controlling the second controllable airbag 8 to expand and controlling the first controllable airbag 7 to contract;

[0058] S2, start the electromagnetic coil 6, the electromagnetic coil 6 generates a magnetic field to push the front slide 3 wrapped with the magnet ring 4 to move forward;

[0059] It should be noted that, at this time, since the rear slide 5 is engaged with the inner wall of the extraction borehole through the expanded second controllable airbag 7, the magnetic field of the electromagnetic coil 6 pushes the front slide 3 to move forward;

[0060] S3, after the front slide 3 reaches the maximum forward stroke, the electromagnetic coil 6 is turned off to control the first controllable airbag 7 to expand and the second controllable airbag 8 to contract;

[0061] S4, the electromagnetic coil 6 is started, and the rear slide 5 moves toward the front slide 3 until it is sleeved and overlapped with the front slide 3 again. At this time, the entire detection mechanism 1 moves forward;

[0062] S5, repeating S1 to S4, alternately controlling the expansion and contraction of the first controllable airbag 7 and the second controllable airbag 8, and cooperating with the electromagnetic coil 6 to realize the movement of the detection mechanism 1.

[0063] It should be noted that in order to realize the backward movement of the detection mechanism 1, it is only necessary to change the order of the expansion and contraction of the first controllable airbag 7 and the second controllable airbag 8, and then cooperate with the electromagnetic coil 6 to realize the backward movement of the detection mechanism 1.

[0064] Compared with the existing coal mine gas extraction drilling gas leakage detection and positioning device, the present invention, by installing a front slide 3 with a first controllable airbag 7 and a rear slide 5 with a second controllable airbag 8, and cooperating with a magnet ring 4 and an electromagnetic coil 6, enables the detection mechanism 1 to efficiently move in the extraction borehole, which is convenient for walking and detecting in the extraction boreholes with different inclination angles; at the same time, by using the first acoustic wave positioning sensor 9 and the second acoustic wave positioning sensor 10, the detection mechanism 1 is quickly close to the leakage position, replacing the traditional detection device for detecting the extraction borehole section by section, thereby improving the detection efficiency; in addition, the leakage is quickly located by the first infrared distance sensor 12 arranged opposite to the storage mechanism 2, overcoming the problem of low positioning accuracy caused by the traditional detection device using the cable release amount to locate the leakage position, thereby improving the positioning accuracy; in addition, the first controllable airbag 7 and the second controllable sealing chamber 8 are used to enclose and seal the part of the extraction borehole located at the leakage position, and the gas concentration sensor 11 is used to measure the leakage speed at the leakage position, so as to facilitate the judgment of whether the leakage port reaches the standard that needs to be blocked.

[0065] See also Figure 4 Both the front slide 3 and the rear slide 5 are hollow cylindrical structures. An axial slider 301 is fixedly connected to the outer wall at the end of the front slide 3, and an axial slide groove 501 distributed along its axial direction is opened on the inner wall of the rear slide 5. The axial slider 301 is slidably nested in the axial slide groove 501.

[0066] Specifically, the maximum travel distance of the front slide 3 and the rear slide 5 is limited by the axial sliding block 301 and the axial sliding groove 501, and the stability of the two when sliding relative to each other is improved.

[0067] See also Figure 3-6 The first controllable airbag 7 includes a sliding plate 17 fixedly connected to the front end of the front slide 3, and an airbag body 18 is nested in the middle thereof; the inner side of the airbag body 18 is connected to an air storage bag 19 through a pipeline and an air pump 20, and the side away from the air pump 20 is connected to the air storage bag 19 through an electromagnetic valve 21.

[0068] Specifically, the expansion and contraction of the airbag body 18 is achieved through the air pump 20 and the solenoid valve 21 .

[0069] See also Figure 6 The sliding plate 17 is annular in structure, and an annular cavity 1701 for accommodating the airbag body 18, the air storage bag 19, the air pump 20 and the solenoid valve 21 is opened in the middle thereof, and a conical portion 1702 with a right-angled trapezoidal cross-section is provided at the edges of both sides of the sliding plate 17.

[0070] Specifically, the sliding plate 17 with the annular cavity 1701 is convenient for accommodating the contracted airbag body 18 , and at the same time, the conical portion 1702 is convenient for the first controllable airbag 7 to move in the extraction borehole.

[0071] See also Figure 6 Both the airbag body 18 and the air storage bag 19 are annular airbags. The circumferential outer wall of the airbag body 18 is provided with an inwardly recessed inner concave portion 1801. When the airbag body 18 is not inflated, the inner concave portion 1801 is recessed inward.

[0072] Specifically, the airbag body 18 and the air storage bag 19, both of which are annular airbags, improve the integration of the first controllable airbag 7. At the same time, the airbag body 18 with the inner recess 1801 further improves the protection of the airbag body 18 and reduces the wear and damage of the airbag body 18 during sliding.

[0073] Second implementation method:

[0074] Figure 2 , Figure 3 , Figure 4 and Fig.10 A coal mine gas extraction drilling gas leakage detection and positioning device is shown. On the basis of the first embodiment, the inner wall of the second controllable airbag 8 is fixedly connected to a third sonic positioning sensor 22 arranged opposite to the second sonic positioning sensor 10. The third sonic positioning sensor 22 is used to detect the distance from the second controllable airbag 8 to the right end of the leakage port. The second controllable airbag 8 is fixedly connected to a second infrared distance sensor 23 arranged opposite to the front slide 3. The second infrared distance sensor 23 is used to detect the relative movement distance between the front slide 3 and the rear slide 5.

[0075] Specifically, when the first controllable airbag 7 moves to the front side of the leakage port, the second sonic positioning sensor 10 detects the distance between the first sealed airbag 7 and the left side of the leakage port. At the same time, the third sonic positioning sensor 22 detects the distance between the first controllable airbag 8 and the right side of the leakage port. Then, by starting the electromagnetic coil 6, the first sealed airbag 7 and the first controllable airbag 8 are symmetrically distributed on both sides close to the leakage port, thereby reducing the volume of the enclosed sealed cavity and improving the detection speed and leakage speed detection accuracy.

[0076] In particular, please refer to Fig.10 The leakage holes on the inner wall of the extraction borehole include hole-shaped leakage holes and long slit-shaped leakage holes. The relative displacement distance between the front slide 3 and the rear slide 5 is detected by the second infrared distance sensor 23. Then the fixed length of the front slide 3 is known. The sum of the relative displacement distance and the fixed length is equal to the interval distance between the second sonic positioning sensor 10 and the third sonic positioning sensor 22. The interval distance is close to the length of the leakage hole. Therefore, the length of the leakage hole is obtained, which is convenient for determining the length of the sealing section during the subsequent sealing operation, and then selecting a suitable sealer.

[0077] See also Figure 2The outer wall of the second controllable airbag 8 is fixedly connected to an execution end controller 13, the storage mechanism 2 includes a fixed cylinder 14 nested in the opening position of the extraction drilling hole, and the fixed cylinder 14 is fixedly connected to a monitoring end controller 16. Both the execution end controller 13 and the monitoring end controller 16 include a communication module for wirelessly controlling the detection mechanism 1.

[0078] See also Figure 2 The fixed cylinder 14 is a hollow cylindrical structure with openings at both ends. The outer opening of the fixed cylinder 14 is connected to the external negative pressure suction pipe. A reflective plate 15 is fixedly connected to the central opening of the fixed cylinder 14. The reflective plate 15 is arranged opposite to the first infrared distance sensor 12.

[0079] Specifically, during detection, the gas in the extraction borehole can flow and be sucked normally in the extraction borehole through the center holes of the front slide cylinder 3, the rear slide cylinder 5 and the fixed cylinder 14, avoiding gas accumulation during detection and improving detection safety.

[0080] It should be noted that the monitoring end controller 16 also includes an acoustic wave feature collection module and an acoustic wave feature analysis module. The first acoustic wave positioning sensor 9, the second acoustic wave positioning sensor 10 and the third acoustic wave positioning sensor 22 are all connected to the acoustic wave feature collection module through a communication module. The acoustic wave feature analysis module is used to analyze the acoustic wave features in the extraction borehole and match the acoustic wave features of the leakage position, thereby locating the leakage position and analyzing the leakage opening type.

[0081] It should be further explained that the sound wave characteristics include volume (amplitude) characteristics, pitch (frequency) characteristics and timbre (including different frequency components of harmonics and noise) characteristics. The sound wave characteristics can be used to easily determine the distance between the leakage port and the detection mechanism 1 and the opening type of the leakage port (mainly including hole-shaped leakage ports and long slit-shaped leakage ports). It is also convenient to control the moving distance of the detection mechanism 1 and adjust the enclosed spacing of the first controllable airbag 7 and the second controllable airbag 8 according to the distance between the leakage port and the detection mechanism 1 and the opening type of the leakage port, thereby further improving the detection efficiency and detection accuracy.

[0082] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A gas leakage detection and positioning device for coal mine gas extraction drilling, characterized in that: The invention comprises a detection mechanism (1) and a storage mechanism (2) installed at the opening of a drilling hole; the detection mechanism (1) comprises a front slide cylinder (3) and a rear slide cylinder (5) which are slidably nested with each other, a magnet ring (4) is nested at the end of the front slide cylinder (3), and an electromagnetic coil (6) distributed along its axial direction is nested in the shell wall of the rear slide cylinder (5); when the electromagnetic coil (6) is energized, the magnetic field generated by the electromagnetic coil (6) interacts with the magnet ring (4) to cause the front slide cylinder (3) and the rear slide cylinder (5) to move relative to each other; The front end of the front slide (3) is provided with a first controllable airbag (7), and the rear end of the rear slide (5) is provided with a second controllable airbag (8). The first controllable airbag (7) and the second controllable airbag (8) have the same structure, and both can realize expansion and contraction. When the two are expanded, they abut against the inner wall of the extraction borehole, and when the two are expanded at the same time, a closed cavity is formed between the two and the inner wall of the extraction borehole. The front end of the first controllable airbag (7) is fixedly connected to a first sonic positioning sensor (9), and the rear end thereof is fixedly connected to a second sonic positioning sensor (10); a gas concentration sensor (11) is fixedly connected to the rear slide (5); and a first infrared distance sensor (12) arranged opposite to the storage mechanism (2) is mounted on the rear slide (5); The inner wall of the second controllable airbag (8) is fixedly connected to a third sonic positioning sensor (22) arranged opposite to the second sonic positioning sensor (10), and the third sonic positioning sensor (22) is used to detect the distance from the second controllable airbag (8) to the right end of the leakage port; the second controllable airbag (8) is fixedly connected to a second infrared distance sensor (23) arranged opposite to the front slide (3), and the second infrared distance sensor (23) is used to detect the relative movement distance between the front slide (3) and the rear slide (5); The outer wall of the second controllable airbag (8) is fixedly connected to an execution end controller (13), the storage mechanism (2) comprises a fixed cylinder (14) nested in the opening position of the extraction borehole, the fixed cylinder (14) is fixedly connected to a monitoring end controller (16), and both the execution end controller (13) and the monitoring end controller (16) comprise a communication module for wirelessly controlling the detection mechanism (1); The fixed cylinder (14) is a hollow cylindrical structure with openings at both ends. The outer end opening of the fixed cylinder (14) is connected to an external negative pressure suction pipe. A reflective plate (15) is fixedly connected to the central opening of the fixed cylinder (14). The reflective plate (15) is arranged opposite to the first infrared distance sensor (12).

2. A gas leakage detection and positioning device for coal mine gas extraction drilling according to claim 1, characterized in that: The first controllable airbag (7) comprises a sliding plate (17) fixedly connected to the front end of the front slide cylinder (3), and an airbag body (18) is nested in the middle thereof; the inner side of the airbag body (18) is connected to an air storage bag (19) via a pipeline and an air pump (20), and the side away from the air pump (20) is connected to the air storage bag (19) via a solenoid valve (21).

3. A coal mine gas extraction drilling gas leakage detection and positioning device according to claim 2, characterized in that: The sliding plate (17) is in the form of a circular ring, and has an annular cavity (1701) in the middle thereof for accommodating the airbag body (18), the air storage bag (19), the air pump (20) and the electromagnetic valve (21). Conical portions (1702) having a right-angled trapezoidal cross section are provided at the edges of both sides of the sliding plate (17).

4. A coal mine gas extraction drilling gas leakage detection and positioning device according to claim 2, characterized in that: The airbag body (18) and the air storage bag (19) are both annular airbags. The circumferential outer wall of the airbag body (18) is provided with an inwardly recessed inner concave portion (1801). When the airbag body (18) is not inflated, the inner concave portion (1801) is recessed inwardly.

5. A coal mine gas extraction drilling gas leakage detection and positioning device according to claim 1, characterized in that: The monitoring end controller (16) further comprises an acoustic wave feature collection module and an acoustic wave feature analysis module. The first acoustic wave positioning sensor (9), the second acoustic wave positioning sensor (10) and the third acoustic wave positioning sensor (22) are all connected to the acoustic wave feature collection module via a communication module. The acoustic wave feature analysis module is used to analyze the acoustic wave features in the extraction borehole and match the acoustic wave features at the leakage port position, thereby locating the leakage port position and analyzing the leakage port opening type.

6. A gas leakage detection and positioning device for coal mine gas extraction drilling according to claim 1, characterized in that: When conducting a drainage borehole leakage location detection, the following steps are included: Step 1: Place the detection mechanism (1) into the extraction borehole, and install the storage mechanism (2) at the opening of the extraction borehole; Step 2: activating the first acoustic wave positioning sensor (9) to perform acoustic wave positioning on the leakage port in the extraction borehole. Based on the position of the leakage port positioned by the acoustic wave, the detection mechanism (1) moves in the extraction borehole to approach the position of the leakage port. Step three, when the first sonic positioning sensor (9) is close to the leaking port, the second sonic positioning sensor (10) is activated, and the detection mechanism (1) continues to move until the second sonic positioning sensor (10) moves to the front side of the leaking port; Step 4: Control the first controllable airbag (7) and the second controllable airbag (8) to expand, so that the first controllable airbag (7), the second controllable airbag (8) and the inner wall of the extraction borehole form an enclosed sealed cavity; Step 5, starting the gas concentration sensor (11) and the first infrared distance sensor (12), detecting the change of gas concentration within a set detection time, and then calculating the gas leakage speed of the current leakage port, and performing distance positioning through the first infrared distance sensor (12); Step six, repeat steps one to five to locate the leakage position and detect the leakage speed of the entire extraction borehole.

7. A gas leakage detection and positioning device for coal mine gas extraction drilling according to claim 6, characterized in that: The walking control process of the detection mechanism (1) includes the following steps: S1, controlling the second controllable airbag (8) to expand and controlling the first controllable airbag (7) to contract; S2, starting the electromagnetic coil (6), the electromagnetic coil (6) generates a magnetic field to push the front slide (3) wrapped with the magnet ring (4) to move forward; S3, after the front slide (3) reaches the maximum forward stroke, the electromagnetic coil (6) is closed, the first controllable airbag (7) is controlled to expand and the second controllable airbag (8) is controlled to contract; S4, the electromagnetic coil (6) is activated, and the rear slide cylinder (5) moves toward the front slide cylinder (3) until it is again sleeved and overlapped with the front slide cylinder (3). At this time, the entire detection mechanism (1) moves forward; S5, repeating S1 to S4, alternately controlling the expansion and contraction of the first controllable airbag (7) and the second controllable airbag (8), and cooperating with the electromagnetic coil (6) to realize the movement of the detection mechanism (1).

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