Coal seam gas sampling device

Abstract

The utility model relates to the technical field of gas sampling, and particularly discloses a coal seam gas sampling device which comprises a negative pressure cylinder, a piston rod is arranged at one end of the negative pressure cylinder, a collecting head is arranged at the other end of the negative pressure cylinder, a gas inlet pipe and an exhaust pipe are connected to the collecting head, and connecting plugs are arranged on the gas inlet pipe and the exhaust pipe. At least four rubber clamping blocks are arranged at the end, close to the connecting plug, of the connector, a rotary sleeve structure is arranged on the outer side of the connector in a sleeving mode, a first clamping groove and a second clamping groove are formed in the outer side of the connector, and the first clamping groove and the second clamping groove are clamped with a limiting assembly arranged on the rotary sleeve structure. After insertion is completed, the rotary sleeve structure on the outer side of the connector is rotated, the rotary sleeve structure can be transferred to the outer side of the rubber clamping block from the outer side of the connector to enable the four rubber clamping blocks to be collected, the rubber clamping blocks clamp the insertion head in the collection process, and then the air inlet pipe and the exhaust pipe are prevented from falling off; the limiting assembly on the rotary sleeve structure can be clamped with the first clamping groove or the second clamping groove in the outer side of the connector, and it is ensured that the rotary sleeve structure cannot be loosened by limiting rotation of the rotary sleeve structure.

Description

Technical Field

[0001] This utility model relates to the field of gas sampling technology, and in particular to a coal seam gas sampling device. Background Technology

[0002] my country is rich in coal resources, with large, medium, and small coal mines scattered across most provinces, municipalities, and autonomous regions. Of all coal mines nationwide, with the exception of a small number of low-gas mines, the vast majority are high-gas mines. Coal seam gas content is one of the important parameters in gas control and prevention, as well as coalbed methane evaluation and development. Furthermore, gas content determination has always been an international challenge in gas prediction and control. In accordance with the coal industry's policies and requirements such as "extraction before mining," all high-gas coal mines are equipped with gas sampling systems.

[0003] Patent application number CN202321669897.8 discloses a coal mine gas sampling device, including a base, a support seat fixedly connected to the top of the base, the support seat being U-shaped, a connecting ring rotatably connected inside the support seat, and rotating mechanisms for rotating the connecting ring on both symmetrical sides of the support seat surface. A fixed cylinder is sleeved inside the connecting ring, and a connecting cylinder is sleeved on the surface of the fixed cylinder, the connecting cylinder sliding on the surface of the fixed cylinder, the fixed cylinder surface having a sliding mechanism for sliding the connecting cylinder, a sampling tube sleeved at one end of the fixed cylinder, and a fixed seat sleeved at the other end of the sampling tube. Two fixed columns are fixedly connected to the top of the base, and the fixed seat slides between the two fixed columns. The design of the fixed cylinder and the connecting cylinder provides a sealing effect during gas sampling, thus preventing gas leakage and potential hazards to workers. The sampling tube and sampling cylinder are often connected by a plug-in connection. Because the sampling cylinder vibrates during sampling, the connection between the sampling tube and the connector can easily loosen over time, leading to gas leakage and posing a safety hazard. Utility Model Content

[0004] To address the aforementioned problems, this utility model proposes a coal seam gas sampling device to overcome the shortcomings of existing devices.

[0005] To achieve the purpose of this utility model, the utility model is implemented through the following technical solution: a coal seam gas sampling device, including a negative pressure cylinder, a piston rod at one end of the negative pressure cylinder, a sampling head at the other end of the negative pressure cylinder, an air inlet pipe and an exhaust pipe connected to the sampling head, and the air inlet pipe and the exhaust pipe are connected to a connector fixed on the outside of the sampling head;

[0006] The intake pipe and exhaust pipe are equipped with plugs, which are plugged into the connector. The connector has at least four rubber clamps near the plug, and the rubber clamps are movably connected to the connector.

[0007] The connector is fitted with a swivel structure for retracting the four rubber clamps. The swivel structure is threadedly connected to the connector and the rubber clamps. The connector has a first slot and a second slot on its outer side. The first slot and the second slot engage with a limiting component on the swivel structure.

[0008] A further improvement is that: the plug is provided with a threaded head at one end near the connector, the threaded head is fixedly connected to the plug, the threaded head is inserted into the connector and threadedly connected to the inner side wall of the connector, and a sealing ring is sleeved on the outside of the threaded head, the sealing ring engaging with the sealing groove opened on the inner side of the connector.

[0009] A further improvement is that the screw sleeve structure includes a threaded sleeve, which is fitted onto the outside of the connector. A first threaded surface is provided on the outside of the connector, and a second threaded surface is provided on the outside of the rubber clamp. The first threaded surface and the second threaded surface are in communication, and the threaded sleeve is threadedly connected to the first threaded surface and the second threaded surface.

[0010] A further improvement is that the second slot is located at the end of the connector near the rubber clamp, and the first slot is located at the end of the connector away from the rubber clamp.

[0011] A further improvement is that the limiting component includes a fixing bolt assembled on the outside of the threaded sleeve, the fixing bolt being screwed into the threaded sleeve and threadedly connected to the threaded sleeve, and the fixing bolt engaging with the first and second slots.

[0012] A further improvement is made in that the limiting component includes a spring groove formed inside the threaded sleeve, a retaining pin provided in the spring groove, the retaining pin being slidably connected to the spring groove, and a spring provided in the spring groove, one end of the spring being fixedly connected to the retaining pin, and the other end of the spring being fixedly connected to the inside of the spring groove. Similarly, when the threaded sleeve is rotated, when the spring groove on the threaded sleeve coincides with the first and second retaining grooves on the outside of the connector, the retaining pin on the inside of the threaded sleeve will pop out and engage with the first and second retaining grooves, restricting the rotation of the threaded sleeve.

[0013] A further improvement is that a polygonal ring is provided on the outside of the threaded sleeve, the polygonal ring is fitted on the outside of the threaded sleeve, and the polygonal ring is fixedly connected to the threaded sleeve.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] After the connection is completed, rotate the screw sleeve structure on the outside of the connector. The screw sleeve structure will move from the outside of the connector to the outside of the rubber clamp, causing the four rubber clamps to tighten. The rubber clamps clamp the connector during tightening, thus preventing the intake and exhaust pipes from falling off. The limiting component on the screw sleeve structure will engage with the first or second slot on the outside of the connector. By restricting the rotation of the screw sleeve structure, it is ensured that the screw sleeve structure will not loosen. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural diagram of the negative pressure cylinder in this utility model.

[0018] Figure 2 This is a structural diagram of the connector and plug after disassembly in this utility model.

[0019] Figure 3 This is a structural diagram of the threaded sleeve and connector after disassembly in this utility model.

[0020] Figure 4 This is a structural diagram of the internal structure of the threaded sleeve in this utility model.

[0021] The components are: 1. Negative pressure cylinder; 2. Piston rod; 3. Collection head; 4. Connector; 5. Inlet pipe; 6. Exhaust pipe; 7. First threaded surface; 8. Rubber clamp; 9. Second threaded surface; 10. Polygonal ring; 11. Insert connector; 12. Threaded head; 13. Sealing ring; 14. First slot; 15. Second slot; 16. Spring groove; 17. Locking pin; 18. Spring; 19. Threaded sleeve; 20. Fixing bolt. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] according to Figure 1 , 2 As shown in Figures 3 and 4, this embodiment proposes a coal seam gas sampling device, including a negative pressure cylinder 1. One end of the negative pressure cylinder 1 is provided with a piston rod 2, and the other end of the negative pressure cylinder 1 is provided with a sampling head 3. The sampling head 3 is connected to an air inlet pipe 5 and an exhaust pipe 6. The air inlet pipe 5 and the exhaust pipe 6 are connected to a connector 4 fixed on the outside of the sampling head 3. By pulling the piston rod 2, the piston inside the negative pressure cylinder 1 is driven to move, and a negative pressure is formed in the sampling chamber of the negative pressure cylinder 1. The gas in the surrounding environment is drawn into the negative pressure cylinder 1 through the air inlet pipe 5. When the piston rod 2 is pushed, the piston will discharge the gas drawn into the negative pressure cylinder 1 to the outside through the exhaust pipe 6.

[0024] The intake pipe 5 and the exhaust pipe 6 are provided with a connector 11, which is inserted into the connector 4. The connector 4 is provided with at least four rubber clamps 8 near the end of the connector 11, and the rubber clamps 8 are movably connected to the connector 4.

[0025] The outer side of the connector 4 is fitted with a swivel structure for retracting the four-lobed rubber clamp 8. The swivel structure is threadedly connected to the connector 4 and the rubber clamp 8. The outer side of the connector 4 is provided with a first slot 14 and a second slot 15. The first slot 14 and the second slot 15 engage with the limiting component provided on the swivel structure.

[0026] The intake pipe 5 and exhaust pipe 6 are connected to the connector 4 via the plug 11. After the connection is completed, the rotating sleeve structure on the outside of the connector 4 is rotated. The rotating sleeve structure will move from the outside of the connector 4 to the outside of the rubber clamp 8, and the four-lobed rubber clamp 8 will be tightened. The four-lobed rubber clamp 8 will squeeze the plug 11 during tightening, clamping the plug 11 and thus preventing the intake pipe 5 and exhaust pipe 6 from falling off. The limiting component on the rotating sleeve structure will engage with the first slot 14 or the second slot 15 on the outside of the connector 4. By restricting the rotation of the rotating sleeve structure, it is ensured that the rotating sleeve structure will not loosen.

[0027] It is worth explaining in detail that the connector 11 has a threaded head 12 near the connector 4. The threaded head 12 is fixedly connected to the connector 11, inserted into the connector 4 and threadedly connected to the inner wall of the connector 4. A sealing ring 13 is fitted on the outside of the threaded head 12, and the sealing ring 13 engages with a sealing groove opened on the inside of the connector 4. By rotating the connector 11, the threaded head 12 is screwed into the inside of the connector 4. The sealing ring 13 on the outside of the threaded head 12 is pushed into the sealing groove opened on the inside of the connector 4 by compression, which enhances the seal at the connection between the connector 11 and the connector 4 and ensures that the gas does not leak during sampling.

[0028] Regarding the spiral sleeve structure:

[0029] The screw-on structure includes a threaded sleeve 19, which is fitted onto the outside of the connector 4. The outside of the connector 4 has a first threaded surface 7, and the outside of the rubber clamp 8 has a second threaded surface 9. The first threaded surface 7 and the second threaded surface 9 communicate with each other, and the threaded sleeve 19 is threadedly connected to both the first threaded surface 7 and the second threaded surface 9. Rotating the threaded sleeve 19 moves it from the first threaded surface 7 on the outside of the connector 4 to the second threaded surface 9 on the outside of the rubber clamp 8. Driven by the threaded sleeve 19, each rubber clamp 8 moves closer to the connector 11, clamping it in place.

[0030] It is worth explaining in detail that the second slot 15 is located at the end of the connector 4 near the rubber clamp 8, and the first slot 14 is located at the end of the connector 4 away from the rubber clamp 8. When the sleeve structure is screwed from the outside of the rubber clamp 8 to the outside of the connector 4, the limiting component on the sleeve structure will engage with the first slot 14 to limit the sleeve structure. When the sleeve structure is screwed from the outside of the connector 4 to the outside of the rubber clamp 8, the limiting component will engage with the second slot 15 to lock the sleeve structure and ensure that the sleeve structure will not loosen.

[0031] Regarding the limit component:

[0032] The limiting component includes a retaining bolt 20 mounted on the outside of the threaded sleeve 19. The retaining bolt 20 is screwed into the threaded sleeve 19 and threadedly connected to it. The retaining bolt 20 engages with the first retaining groove 14 and the second retaining groove 15. When the threaded sleeve 19 rotates to the outside of the connector 4 or the rubber clamp 8, the retaining bolt 20 is rotated to screw it into the first retaining groove 14 or the second retaining groove 15. The first retaining groove 14 and the second retaining groove 15, by engaging with the retaining bolt 20, restrict the rotation of the threaded sleeve 19.

[0033] In another preferred embodiment, the limiting component includes a spring groove 16 formed inside the threaded sleeve 19. A locking pin 17 is provided within the spring groove 16, and the locking pin 17 is slidably connected to the spring groove 16. A spring 18 is provided within the spring groove 16, with one end of the spring 18 fixedly connected to the locking pin 17 and the other end of the spring 18 fixedly connected to the inside of the spring groove 16. Similarly, when the threaded sleeve 19 is rotated, and the spring groove 16 on the threaded sleeve 19 coincides with the first locking groove 14 and the second locking groove 15 on the outside of the connector 4, the locking pin 17 inside the threaded sleeve 19 will pop out and engage with the first locking groove 14 and the second locking groove 15, restricting the rotation of the threaded sleeve 19. The end of the locking pin 17 is an arc surface, allowing it to be squeezed out of the first locking groove 14 and the second locking groove 15 during continued rotation, preventing jamming.

[0034] To facilitate the rotation of the threaded sleeve 19, in a preferred embodiment, a polygonal ring 10 is provided on the outer side of the threaded sleeve 19. The polygonal ring 10 is fitted onto the outer side of the threaded sleeve 19 and is fixedly connected to the threaded sleeve 19. When rotating the threaded sleeve 19, the polygonal ring 10 can be moved.

[0035] How this application works:

[0036] By pulling the piston rod 2, the piston inside the negative pressure cylinder 1 is driven to move, creating a negative pressure in the sampling chamber of the negative pressure cylinder 1. Gas from the surrounding environment is drawn into the negative pressure cylinder 1 through the air inlet pipe 5. When the piston rod 2 is pushed, the piston will expel the gas drawn into the negative pressure cylinder 1 through the exhaust pipe 6. The air inlet pipe 5 and the exhaust pipe 6 are connected to the connector 4 through the plug-in 11. After the connection is completed, the rotating sleeve structure on the outside of the connector 4 is rotated, and the rotating sleeve structure will move from the outside of the connector 4 to the outside of the rubber clamp 8, causing the four-lobed rubber clamp 8 to contract. The four-lobed rubber clamp 8 squeezes the plug-in 11 during contraction, clamping the plug-in 11 and thus preventing the air inlet pipe 5 and the exhaust pipe 6 from falling off. The limiting component on the rotating sleeve structure will engage with the first slot 14 or the second slot 15 on the outside of the connector 4. By restricting the rotation of the rotating sleeve structure, it is ensured that the rotating sleeve structure will not loosen, further improving the stability of the connection between the connector 4 and the plug-in 11.

[0037] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0038] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. 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 this application. Therefore, this application 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 claimed herein.

Claims

1. A coal seam gas sampling device, comprising a negative pressure cylinder (1), a piston rod (2) provided at one end of the negative pressure cylinder (1), and a sampling head (3) provided at the other end of the negative pressure cylinder (1), wherein an air inlet pipe (5) and an exhaust pipe (6) are connected to the sampling head (3), characterized in that: The air inlet pipe (5) and the air outlet pipe (6) are connected to the connector (4) fixed on the outside of the collection head (3); The intake pipe (5) and the exhaust pipe (6) are provided with connectors (11), the connectors (11) are inserted into the connector (4), and the connector (4) is provided with at least four rubber clamps (8) near the end of the connector (11), and the rubber clamps (8) are movably connected to the connector (4). The connector (4) is fitted with a swivel structure for retracting the four rubber clamps (8). The swivel structure is threadedly connected to the connector (4) and the rubber clamps (8). The connector (4) has a first slot (14) and a second slot (15) on its outer side. The first slot (14) and the second slot (15) engage with the limiting component provided on the swivel structure.

2. The coal seam gas sampling device according to claim 1, characterized in that: The plug (11) has a threaded head (12) at one end near the connector (4). The threaded head (12) is fixedly connected to the plug (11). The threaded head (12) is inserted into the connector (4) and threadedly connected to the inner wall of the connector (4). A sealing ring (13) is sleeved on the outside of the threaded head (12). The sealing ring (13) engages with the sealing groove opened on the inner side of the connector (4).

3. The coal seam gas sampling device according to claim 1, characterized in that: The screw sleeve structure includes a threaded sleeve (19), which is sleeved on the outside of the connector (4). A first threaded surface (7) is provided on the outside of the connector (4), and a second threaded surface (9) is provided on the outside of the rubber clamp (8). The first threaded surface (7) and the second threaded surface (9) are in communication, and the threaded sleeve (19) is threadedly connected to the first threaded surface (7) and the second threaded surface (9).

4. The coal seam gas sampling device according to claim 3, characterized in that: The second slot (15) is located at one end of the connector (4) near the rubber clamp (8), and the first slot (14) is located at one end of the connector (4) away from the rubber clamp (8).

5. A coal seam gas sampling device according to claim 4, characterized in that: The limiting component includes a fixing bolt (20) mounted on the outside of the threaded sleeve (19). The fixing bolt (20) is screwed into the threaded sleeve (19) and threadedly connected to the threaded sleeve (19). The fixing bolt (20) cooperates with the first slot (14) and the second slot (15).

6. The coal seam gas sampling device according to claim 4, characterized in that: The limiting component includes a spring groove (16) formed inside the threaded sleeve (19), a retaining pin (17) is provided in the spring groove (16), the retaining pin (17) is slidably connected to the spring groove (16), a spring (18) is provided in the spring groove (16), one end of the spring (18) is fixedly connected to the retaining pin (17), and the other end of the spring (18) is fixedly connected to the inside of the spring groove (16).

7. A coal seam gas sampling device according to claim 3, characterized in that: The threaded sleeve (19) is provided with a polygonal ring (10) on the outside. The polygonal ring (10) is fitted on the outside of the threaded sleeve (19) and is fixedly connected to the threaded sleeve (19).

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