Self-sealing and self-decompressing coal seam sampling device

Abstract

The application provides a self-sealing and self-decompression coal seam sampling device, belonging to the technical field of coal seam sampling, which comprises a drill bit sleeve, a first ball valve is installed inside the drill bit sleeve, a sampling drill rod is arranged above the first ball valve, and the sampling drill rod is slidingly installed in the drill bit sleeve; a sampling cylinder is connected to the top of the drill bit sleeve, a through hole is penetrated through the side wall of the sampling cylinder, a coal storage cylinder is slidingly installed in the sampling cylinder, the bottom of the coal storage cylinder is communicated with a sampling cavity of the sampling drill rod through a second ball valve, a suction cylinder is installed at the top of the coal storage cylinder, a sealed storage barrel and a suction cavity are arranged in the inner cavity of the suction cylinder, the sealed storage barrel and the suction cavity are communicated through a switch valve and a suction pump, a suction hole is penetrated through the outer circle of the suction cavity, and the suction hole is communicated with the through hole; an outer shell is connected to the top of the sampling cylinder, a pushing mechanism is installed in the outer shell, and the pushing mechanism pushes the suction cylinder, the coal storage cylinder and the sampling drill rod to move up and down. The application has the beneficial effects of simplifying the on-site sampling operation process and improving the reliability of samples.

Description

Technical Field

[0001] This invention belongs to the field of coal seam sampling technology, specifically relating to a self-sealing and self-depressurizing coal seam sampling device. Background Technology

[0002] Coal is formed from plants buried underground, gradually evolving over long geological periods and crustal movements in the absence of air, under the influence of bacteria, pressure, and temperature. Furthermore, coal mines may contain harmful gases such as methane and carbon dioxide, which pose risks of explosion, asphyxiation, and poisoning to miners.

[0003] Therefore, before mining a coal mine, it is necessary to explore and detect the coal seams so that miners can detect the presence and concentration of harmful gases in advance, identify other potential safety hazards in the mine, and take appropriate safety measures in a timely manner to reduce the occurrence of accidents. For example, if a high concentration of methane is detected in the coal seam, ventilation and fire extinguishing measures can be taken to prevent a coal seam explosion.

[0004] Currently, existing coal seam sampling devices typically use traditional core tubes for sampling. This method requires first drilling to the sampling point using ordinary drill bits, then removing the drill rod, replacing it with a core tube, and re-entering the sampling point to collect the sample. Therefore, the entire sampling process is complex, cumbersome, and inefficient, taking far longer than the stipulated 5 minutes. This can easily lead to significant errors in the sampling results due to difficulties in accurately calculating the amount of gas released during sampling. Furthermore, when sampling from downward boreholes, the coal sample is prone to falling out during the withdrawal of the core drill, resulting in sampling failure. Summary of the Invention

[0005] The purpose of this invention is to address the problems of cumbersome processes, large sampling errors, and easy coal sample loss in existing coal seam sampling devices. This invention proposes and designs a self-sealing and self-depressurizing coal seam sampling device to overcome these problems, simplify the on-site sampling process, and improve sample reliability.

[0006] To achieve the above objectives, the technical solution provided by this invention is as follows: a self-sealing and self-depressurizing coal seam sampling device, comprising a drill bit sleeve, drill teeth at the bottom of the drill bit sleeve, a first ball valve installed inside the drill bit sleeve, a sampling drill rod above the first ball valve, the sampling drill rod being slidably installed inside the drill bit sleeve, a sampling cavity penetrating through the middle of the sampling drill rod, sampling teeth at the bottom of the sampling drill rod, and the sampling teeth at the bottom of the sampling drill rod being able to penetrate the first ball valve and be flush with the drill teeth and located above the first ball valve; a sampling cylinder is connected to the top of the drill bit sleeve, and a sampling tube is penetrating through the side wall of the sampling cylinder. The sampling cylinder has a through hole and a coal storage cylinder that is slidably installed inside. The bottom of the coal storage cylinder is connected to the sampling chamber of the sampling drill rod through a second ball valve. A suction cylinder is installed on the top of the coal storage cylinder. The inner cavity of the suction cylinder has a sealed storage tank and a suction chamber arranged sequentially from top to bottom. The sealed storage tank and the suction chamber are connected to a suction pump through a switch valve. The outer ring of the suction chamber has a suction hole that can communicate with the through hole. The top of the sampling cylinder is connected to an outer shell. A pushing mechanism is installed inside the outer shell. The power output end of the pushing mechanism is connected to the top of the suction cylinder and can push the suction cylinder, the coal storage cylinder, and the sampling drill rod to move up and down together.

[0007] On the one hand, because this invention integrates the drill bit sleeve and the sampling drill rod into one unit and utilizes the first and second ball valves to achieve a sealing effect, during sampling, this invention eliminates the need to remove the drill bit and replace it after drilling is completed. This simplifies on-site operations, reduces the workload of workers, and prevents sampling failures caused by the falling of sampled coal blocks during the removal process. On the other hand, during coal block sampling, this invention can control the suction pump to work synchronously, drawing coalbed methane from the coal seam into a sealed storage container for preservation. This avoids the problem of coalbed methane dissipation caused by prolonged exposure of the coal seam at the sampling location due to drill bit replacement, thus making the obtained samples more reliable and the analysis results more accurate.

[0008] Furthermore, the inner wall of the drill bit sleeve is provided with two positioning holes, and positioning components are installed in the positioning holes. The upper and lower parts of the outer wall of the sampling drill rod are provided with two positioning grooves. When the bottom of the sampling drill rod is above the first ball valve, the positioning component engages with the positioning groove on the lower part of the outer wall of the sampling drill rod; when the bottom of the sampling drill rod is below the first ball valve, the positioning component engages with the positioning groove on the upper part of the outer wall of the sampling drill rod. The engagement between the positioning component and the corresponding positioning groove ensures that the sampling drill rod and the drill bit sleeve can rotate together.

[0009] Furthermore, the positioning component includes a plug installed on the outside of the positioning hole, a positioning spring connected to the inside of the plug, a positioning seat connected to the end of the positioning spring away from the plug, the positioning seat being slidably installed in the positioning hole, and a positioning ball being rolledly installed on the end of the positioning seat away from the plug. The positioning ball can engage with the corresponding positioning groove and provide a positioning effect for the sampling drill rod.

[0010] Furthermore, the upper end of the sampling drill rod is provided with a flange edge, and the inner wall of the drill bit sleeve is provided with a stepped limiting groove above the first ball valve. When the bottom of the sampling drill rod passes through the first ball valve, the flange edge abuts against the stepped limiting groove to limit the movement of the sampling drill rod and prevent the sampling drill rod from slipping out of the drill bit sleeve.

[0011] Furthermore, the driving mechanism includes a servo motor installed inside the housing. The power output end of the servo motor is connected to a threaded sleeve, the end of which is rotatably mounted on a partition plate via a bearing seat. The partition plate is fixedly mounted on the inner wall of the housing. A threaded rod is threadedly connected inside the threaded sleeve, and the bottom of the threaded rod passes through the partition plate and is fixedly mounted on the top of the suction cylinder. In this way, the threaded engagement between the threaded rod and the threaded sleeve can drive the suction cylinder, coal storage cylinder, and sampling drill rod to move up and down together, thereby completing the corresponding sampling work.

[0012] Furthermore, a primary filter screen is installed on the outside of the through hole, a secondary filter screen is installed on the inside of the through hole, and a tertiary filter screen is installed in the suction hole. Through the triple filtration of the primary, secondary, and tertiary filter screens, coal slag is effectively prevented from entering the suction chamber and affecting the normal operation of the suction pump.

[0013] Furthermore, the top of the suction cylinder has a mounting groove, the sealed storage container is installed in the mounting groove, and a locking plate is installed on the top of the mounting groove. This detachable structure, through the engagement of the locking plate and the mounting groove, allows workers to easily remove the sealed storage container.

[0014] Furthermore, a connector is provided on the top of the housing, through which the invention can be connected to other external devices for corresponding operations.

[0015] Furthermore, the outer wall of the drill bit sleeve is provided with a spiral groove, and the outer wall of the outer shell is provided with a spiral-shaped expansion guide plate. The expansion guide plate makes the diameter of the coal seam borehole larger than the diameter of the outer shell, so as to ensure that the drill bit sleeve, sampling cylinder and outer shell will not be blocked when they are withdrawn.

[0016] Furthermore, the drill bit sleeve, sampling tube, and outer casing are detachably connected together from bottom to top, making it easy for staff to disassemble, clean, and maintain them.

[0017] As can be seen from the above technical solutions, the present invention has the following advantages: On the one hand, since the present invention integrates the drill bit sleeve and the sampling drill rod, and uses the first ball valve and the second ball valve to achieve a sealing effect, when using the present invention for sampling, there is no need to withdraw the drill bit and replace it after drilling is completed, which simplifies the on-site operation, reduces the workload of workers, and prevents sampling failure caused by the falling of sampled coal blocks during the withdrawal process; on the other hand, when sampling coal blocks, the present invention can control the suction pump to work synchronously, drawing the coalbed methane in the coal seam into a sealed storage tank for sealed preservation, avoiding the problem of coalbed methane escaping due to prolonged exposure of the coal seam at the sampling location in the hole caused by replacing the drill bit, thereby making the obtained sample more reliable and the analysis results more accurate. Attached Figure Description

[0018] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of a specific embodiment of the present invention;

[0020] Figure 2 This is a cross-sectional view of a specific embodiment of the present invention;

[0021] Figure 3 for Figure 1 Enlarged diagram of point A in the middle.

[0022] In the diagram: 1. Drill bit sleeve; 2. Drill bit teeth; 3. First ball valve; 4. Sampling drill rod; 5. Sampling drill teeth; 6. Positioning hole; 7. Positioning assembly; 8. Positioning groove; 9. Sampling cylinder; 10. Coal storage cylinder; 11. Second ball valve; 12. Suction cylinder; 13. Suction chamber; 14. Suction hole; 15. Suction pump; 16. Sealed storage tank; 17. Through hole; 18. Partition plate; 19. Outer shell; 20. Pushing mechanism; 21. Spiral groove; 22. Stepped limiting groove; 23. Plug; 24. Positioning spring; 25. Positioning seat; 26. Positioning ball; 27. Servo motor; 28. Threaded sleeve; 29. ​​Threaded rod; 30. Bearing seat; 31. Primary filter screen; 32. Secondary filter screen; 33. Tertiary filter screen; 34. Locking plate; 35. Switch valve; 36. Connector. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figures 1 to 3 As shown, the present invention provides a self-sealing and self-depressurizing coal seam sampling device, which includes a drill bit sleeve 1, a sampling cylinder 9, and a shell 19 that are detachably connected from bottom to top.

[0025] The drill bit sleeve 1 has drill teeth 2 at its bottom and a first ball valve 3 installed inside. A sampling drill rod 4 is positioned above the first ball valve 3. The sampling drill rod 4 is vertically slidably installed inside the drill bit sleeve 1, and a sampling cavity is penetrated through the middle of the sampling drill rod 4. The bottom of the sampling drill rod 4 has sampling teeth 5, which are positioned so that after the bottom of the sampling drill rod 4 penetrates the first ball valve 3, they are flush with the drill teeth 2 and located above the first ball valve 3. This allows the bottom of the sampling drill rod 4 to both extend out of the first ball valve 3 for sampling and to be hidden above the first ball valve 3, avoiding any impact on the drilling operation of the drill bit sleeve 1. As a result, after drilling is completed, there is no need to remove the drill bit and replace it, simplifying on-site operations and reducing the workload of workers.

[0026] In addition, to ensure that the sampling drill rod 4 can rotate together with the drill bit sleeve 1, the present invention also provides two positioning holes 6 on the inner wall of the drill bit sleeve 1, and positioning components 7 are provided in the two positioning holes 6; and the positioning components 7 include a plug 23 installed on the outside of the positioning holes 6, a positioning spring 24 connected to the inner side of the plug 23, a positioning seat 25 connected to the end of the positioning spring 24 away from the plug 23, the positioning seat 25 being slidably installed in the positioning holes 6 in the horizontal direction, and a positioning ball 26 being rolledly installed on the end of the positioning seat 25 away from the plug 23; two positioning grooves 8 are provided on the upper and lower parts of the outer wall of the sampling drill rod 4, and the positioning ball 26 in the positioning components 7 can engage with the positioning groove 8 on the lower part of the outer wall of the sampling drill rod 4 when the bottom of the sampling drill rod 4 is above the first ball valve 3, and engage with the positioning groove 8 on the upper part of the outer wall of the sampling drill rod 4 when the bottom of the sampling drill rod 4 is below the first ball valve 3. In this way, the cooperation between the positioning component 7 and the positioning groove 8 at the corresponding position can ensure that the sampling drill rod 4 and the drill bit sleeve 1 can rotate together.

[0027] Preferably, to prevent the sampling drill rod 4 from slipping out of the drill bit sleeve 1 and to constrain the position of the sampling drill rod 4, the present invention provides a flange at the upper end of the sampling drill rod 4, and a stepped limiting groove 22 is provided on the inner wall of the drill bit sleeve 1 above the first ball valve 3, so that the flange can abut against the stepped limiting groove 22 after passing through the first ball valve 3 at the bottom of the sampling drill rod 4, thereby limiting the movement position of the sampling drill rod 4 and preventing the sampling drill rod 4 from slipping out of the drill bit sleeve 1.

[0028] The sampling cylinder 9 has a through hole 17 penetrating its side wall. A coal storage cylinder 10 is vertically slidably installed inside the sampling cylinder 9. The bottom of the coal storage cylinder 10 and the top of the sampling drill rod 4 are preferably locked together by a threaded connection structure. The bottom of the coal storage cylinder 10 and the sampling chamber of the sampling drill rod 4 are connected by a second ball valve 11. In this way, when the sampling drill rod 4 is used to drill and sample the coal seam, the drilled coal block can enter the coal storage cylinder 10 through the sampling chamber of the sampling drill rod 4 and the second ball valve 11 for storage. After a suitable sampling volume is reached, the second ball valve 11 can be controlled to close, so that the coal storage cylinder 10 is sealed, avoiding the problem of sampled coal blocks falling out during the extraction process.

[0029] A suction cylinder 12 is installed on the top of the coal storage cylinder 10. The inner cavity of the suction cylinder 12, from top to bottom, contains a sealed storage tank 16 and a suction chamber 13. The sealed storage tank 16 and the suction chamber 13 are connected to a suction pump 15 via a switch valve 35. A suction hole 14 penetrates the outer ring of the suction chamber 13, ensuring that the suction hole 14 aligns and communicates with the through hole 17 when the bottom of the sampling drill rod 4 is below the first ball valve 3. Thus, while sampling coal, the present invention can control the suction pump 15 to start working, drawing coalbed methane from the coal seam into the sealed storage tank 16 for sealing and preservation.

[0030] Furthermore, to facilitate the removal of the sealed storage container 16 by staff, the present invention can provide an installation groove on the top of the suction cylinder 12 and install the sealed storage container 16 in the installation groove. A locking plate 34 is installed on the top of the installation groove, so that the suction cylinder 12 can be opened and the sealed storage container 16 can be removed simply by opening the locking plate 34.

[0031] To prevent coal slag from entering the suction chamber 13 and affecting the normal operation of the suction pump 15, the present invention installs a primary filter screen 31 on the outside of the through hole 17, a secondary filter screen 32 on the inside of the through hole 17, and a tertiary filter screen 33 in the suction hole 14. Through the triple filtration of the primary filter screen 31, the secondary filter screen 32 and the tertiary filter screen 33, coal slag is effectively prevented from entering the suction chamber 13.

[0032] A pushing mechanism 20 is installed inside the outer casing 19. The pushing mechanism 20 includes a servo motor 27 installed inside the outer casing 19. The power output end of the servo motor 27 is driven by a threaded sleeve 28. The end of the threaded sleeve 28 is rotatably mounted on a partition 18 via a bearing seat 30. The partition 18 is fixedly mounted on the inner wall of the outer casing 19. A threaded rod 29 is threadedly connected to the inside of the threaded sleeve 28, and the bottom of the threaded rod 29 passes through the partition 18 and is fixedly mounted on the top of the suction cylinder 12. In this way, the threaded engagement between the threaded rod 29 and the threaded sleeve 28 can drive the suction cylinder 12, the coal storage cylinder 10, and the sampling drill rod 4 to move up and down together, and complete the corresponding sampling work.

[0033] The top of the housing 19 is provided with a connector 36, through which the present invention can be connected to other external devices for corresponding operations.

[0034] In addition, as a preferred embodiment, the present invention may also provide a spiral groove 21 on the outer wall of the drill bit sleeve 1 and a spiral-shaped expansion guide plate on the outer wall of the outer shell 19, and make the diameter of the coal seam borehole larger than the diameter of the outer shell 19 by means of the expansion guide plate, so as to ensure that no blockage occurs when the drill bit sleeve 1, the sampling cylinder 9 and the outer shell 19 are withdrawn.

[0035] Based on this, when using the present invention for coal seam sampling, the drill teeth 2 at the bottom of the drill bit sleeve 1 can first rotate in the coal seam, causing the drill bit sleeve 1 to drive the sampling cylinder 9. After the sampling cylinder 9 drives the outer shell 19 to the predetermined position, the first ball valve 3 and the second ball valve 11 are opened, and the pushing mechanism 20 is activated at the same time. The pushing mechanism 20 pushes the suction cylinder 12, the suction cylinder 12 pushes the coal storage cylinder 10, and the coal storage cylinder 10 pushes the sampling drill rod 4 to slide inside the drill bit sleeve 1. This causes the positioning groove 8 on the lower side of the sampling drill rod 4 to exit the positioning component 7 and pass through the first ball valve 3, so that the sampling drill teeth 5 at the bottom of the sampling drill rod 4 and the drill teeth 2 at the bottom of the drill bit sleeve 1 are horizontal. At this time, the positioning groove 8 on the upper side of the sampling drill rod 4 moves to the positioning component 7. The positioning process continues, and the suction hole 14 on the suction cylinder 12 is aligned with the through hole 17. Then, the drill bit sleeve 1 rotates again and continues to move downward. At this time, the sampling drill rod 4 can drill and sample the coal seam. The drilled coal blocks enter the coal storage cylinder 10 through the sampling drill rod 4 and the second ball valve 11 for storage. After reaching a suitable sampling volume, the second ball valve 11 is closed, making the coal storage cylinder 10 a sealed state. At the same time as the coal block is sampled, the suction pump 15 starts to work, drawing the coalbed methane in the coal seam into the sealed storage tank 16 for sealing and maintenance. Then, the push mechanism 20 is reset, and the sampling drill rod 4 is retracted from the first ball valve 3, which can then close the first ball valve 3, thereby completing the sampling of coal blocks and coalbed methane in the coal seam, and achieving a sealing effect after sampling.

[0036] On the one hand, because the present invention integrates the drill bit sleeve 1 and the sampling drill rod 4 into one unit, and uses the first ball valve 3 and the second ball valve 11 to achieve a sealing effect, when using the present invention for sampling, there is no need to withdraw the drill bit and replace it after drilling is completed, which simplifies the on-site operation, reduces the workload of workers, and prevents sampling failure caused by the falling of sampled coal blocks during the withdrawal process. On the other hand, when sampling coal blocks, the present invention can control the suction pump 15 to work synchronously, drawing the coalbed methane in the coal seam into the sealed storage tank 16 for sealed preservation, avoiding the problem of coalbed methane escaping due to prolonged exposure of the coal seam at the sampling location in the hole when replacing the drill bit, thereby making the obtained sample more reliable and the analysis results more accurate.

[0037] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0038] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A self-sealing and self-depressurizing coal seam sampling device, comprising a drill bit sleeve (1), wherein drill teeth (2) are provided at the bottom of the drill bit sleeve (1); characterized in that, A first ball valve (3) is installed inside the drill bit sleeve (1). A sampling drill rod (4) is set above the first ball valve (3). The sampling drill rod (4) is slidably installed inside the drill bit sleeve (1). A sampling cavity is passed through the middle of the sampling drill rod (4). A sampling drill tooth (5) is set at the bottom of the sampling drill rod (4). The sampling drill tooth (5) at the bottom of the sampling drill rod (4) can pass through the first ball valve (3) and be flush with the drill bit tooth (2) and located above the first ball valve (3). 1) The top of the sample tube (9) is connected to a sampling tube (9). The side wall of the sampling tube (9) has a through hole (17). A coal storage tube (10) is slidably installed inside the sampling tube (9). The bottom of the coal storage tube (10) is connected to the sampling chamber of the sampling drill rod (4) through a second ball valve (11). A suction tube (12) is installed on the top of the coal storage tube (10). The inner cavity of the suction tube (12) is provided with a sealed storage tank (16) and a suction chamber (13) from top to bottom. The sealed storage tank (16) The suction chamber (13) is connected to the suction pump (15) via a switch valve (35). The outer ring of the suction chamber (13) has a suction hole (14) that can communicate with the through hole (17). The top of the sampling cylinder (9) is connected to the outer shell (19). The inside of the outer shell (19) is equipped with a push mechanism (20). The power output end of the push mechanism (20) is connected to the top of the suction cylinder (12). The inner wall of the drill bit sleeve (1) is provided with two positioning holes (6). A positioning component (7) is provided inside the positioning hole (6). Two positioning grooves (8) are provided on the upper and lower parts of the outer wall of the sampling drill rod (4). When the bottom of the sampling drill rod (4) is above the first ball valve (3), the positioning component (7) cooperates with the positioning groove (8) on the lower part of the outer wall of the sampling drill rod (4); when the bottom of the sampling drill rod (4) is below the first ball valve (3), the positioning component (7) cooperates with the positioning groove (8) on the upper part of the outer wall of the sampling drill rod (4).

2. The self-sealing and self-decompressing coal seam sampling device according to claim 1, characterized in that, The positioning assembly (7) includes a plug (23) installed on the outside of the positioning hole (6), a positioning spring (24) connected to the inside of the plug (23), a positioning seat (25) connected to the end of the positioning spring (24) away from the plug (23), the positioning seat (25) is slidably installed in the positioning hole (6), and a positioning ball (26) is rolled on the end of the positioning seat (25) away from the plug (23), the positioning ball (26) can engage with the corresponding positioning groove (8).

3. The self-sealing and self-decompressing coal seam sampling device according to claim 1 or 2, characterized in that, The upper end of the sampling drill rod (4) is provided with a flange edge, and the inner wall of the drill bit sleeve (1) is provided with a stepped limiting groove (22) above the first ball valve (3). When the bottom of the sampling drill rod (4) passes through the first ball valve (3), the flange edge abuts against the stepped limiting groove (22).

4. The self-sealing and self-decompressing coal seam sampling device according to claim 1, characterized in that, The driving mechanism (20) includes a servo motor (27) installed inside the housing (19). The power output end of the servo motor (27) is connected to a threaded sleeve (28). The end of the threaded sleeve (28) is rotatably mounted on the partition (18) through a bearing seat (30). The partition (18) is fixedly mounted on the inner wall of the housing (19). The threaded sleeve (28) is connected to a threaded rod (29) with its internal threads. The bottom of the threaded rod (29) passes through the partition (18) and is fixedly mounted on the top of the suction cylinder (12).

5. The self-sealing and self-decompressing coal seam sampling device according to claim 1, characterized in that, A primary filter screen (31) is installed on the outside of the through hole (17), a secondary filter screen (32) is installed on the inside of the through hole (17), and a tertiary filter screen (33) is installed inside the suction hole (14).

6. The self-sealing and self-decompressing coal seam sampling device according to claim 1, characterized in that, The top of the suction cylinder (12) is provided with an installation groove, the sealed storage tank (16) is installed in the installation groove, and a locking plate (34) is installed on the top of the installation groove.

7. The self-sealing and self-decompressing coal seam sampling device according to claim 1, characterized in that, A connector (36) is provided on the top of the housing (19).

8. The self-sealing and self-decompressing coal seam sampling device according to claim 1, characterized in that, The outer wall of the drill bit sleeve (1) is provided with a spiral groove (21), and the outer wall of the outer shell (19) is provided with a spiral-shaped expansion guide plate.

9. The self-sealing and self-decompressing coal seam sampling device according to claim 1, 7, or 8, characterized in that, The drill bit sleeve (1), sampling cylinder (9) and outer shell (19) are detachably connected together from bottom to top.

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