Gas extraction device

Abstract

The utility model relates to the technical field of coal mines, in particular to a gas extraction device which comprises a connecting cylinder, a sealing portion is fixedly connected to the outer wall of the connecting cylinder, an extraction pipe is arranged in the connecting cylinder, a sealing layer is arranged on the inner wall of the connecting cylinder, and the upper end of the connecting cylinder is communicated with a connecting pipe. A vacuum pump is arranged on the connecting pipe in a communicating mode, a fixing block is fixedly connected to the upper end of the extraction pipe, a threaded rod is connected to the fixing block in a threaded penetrating mode, the threaded rod is rotationally connected with the extraction pipe through a sealing bearing, and the connecting pipe is limited through a limiting mechanism. According to the utility model, a high-concentration gas area is prevented from being missed, so that the extraction efficiency is improved.

Description

Technical Field

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

[0002] Gas extraction devices in coal mines are key safety equipment used to extract gas (mainly methane) from coal seams and goaf areas. Their core functions are to reduce gas concentration, prevent gas accidents such as explosions or outbursts, and realize the resource utilization of gas.

[0003] In existing technologies, fixed-depth pipe insertion is used because the distribution of gas in coal seams usually follows a certain pattern, and fixed-depth pipe insertion can cover the main gas-rich layers. Furthermore, fixed depth facilitates the use of standardized drilling rigs, improves efficiency, reduces operational complexity, and makes the process more economical and easier to manage.

[0004] However, while fixed-depth cannulation is simple to implement, the distribution of gas in coal seams is significantly affected by factors such as geological structure, burial depth, and permeability, resulting in substantial differences in gas concentration at different depths. Because fixed-depth cannulation cannot be adjusted, it can only extract gas within a certain range, easily missing high-concentration gas layers and ultimately leading to low extraction efficiency. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies that easily miss high-concentration gas layers, ultimately leading to low extraction efficiency, and to propose a gas extraction device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Design a gas extraction device, including a connecting cylinder, a sealing part fixedly connected to the outer wall of the connecting cylinder, an extraction pipe provided inside the connecting cylinder, a sealing layer provided on the inner wall of the connecting cylinder, a connecting pipe connected to the upper end of the connecting cylinder, a vacuum pump connected to the connecting pipe, a fixing block fixedly connected to the upper end of the extraction pipe, a threaded rod threaded through the fixing block, the threaded rod being rotatably connected to the extraction pipe through a sealed bearing, and the connecting pipe being limited by a limiting mechanism.

[0008] Preferably, the limiting mechanism includes a limiting rod that passes through the fixing block, and the upper end of the limiting rod is fixedly connected to the connecting cylinder.

[0009] Preferably, a stop is fixedly connected to the lower end of the threaded rod.

[0010] Preferably, a rotating part is fixedly connected to the upper end of the threaded rod.

[0011] Preferably, a first gear is fixedly connected to the threaded rod, a fixed disk is fixedly connected to the connecting cylinder, a rotating shaft is rotatably connected to the upper surface of the fixed disk via a bearing, a second gear is fixedly connected to the rotating shaft, the second gear meshes with the first gear, the number of teeth of the second gear is greater than the number of teeth of the first gear, and an indicating mechanism is provided on the rotating shaft.

[0012] Preferably, the indicating mechanism includes a pointer, the pointer is fixedly connected to the upper end of the rotating shaft, and scale lines are provided on the fixed disk.

[0013] Preferably, the thread of the threaded rod is a trapezoidal thread, and the surface of the threaded rod is coated with polytetrafluoroethylene.

[0014] Preferably, both the second gear and the first gear are made of plastic material.

[0015] The gas extraction device proposed in this utility model has the following advantages: by adjusting the position of the fixing block on the threaded rod, the position of the extraction pipe in the connecting cylinder can be adjusted, thereby adjusting the depth of the extraction pipe inserted into the ground so that the extraction pipe can contact gas of different concentrations, avoid missing high-concentration gas areas, and thus improve extraction efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a gas extraction device proposed in this utility model;

[0017] Figure 2 This is a three-dimensional sectional view of a gas extraction device proposed in this utility model.

[0018] Figure 3 This utility model proposes a gas extraction device. Figure 1 Enlarged view of section A;

[0019] Figure 4 This utility model proposes a gas extraction device. Figure 2 Enlarged view of section B;

[0020] Figure 5 This utility model proposes a gas extraction device. Figure 2 Enlarged view of section C.

[0021] In the diagram: 1. Extraction tube; 2. Collection hole; 3. Connecting cylinder; 4. Sealing part; 5. Connecting pipe; 6. Vacuum pump; 7. Rotating part; 8. Threaded rod; 9. First gear; 10. Second gear; 11. Pointer; 12. Scale line; 13. Rotating shaft; 14. Limiting rod; 15. Fixing block; 16. Stop block; 17. Fixing plate. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Example 1: Refer to Figure 1-5 A gas extraction device includes a connecting cylinder 3, on the outer wall of which a sealing part 4 is fixedly connected. The sealing part 4 abuts against the inner wall of the borehole to achieve a preliminary sealing effect. Then, cement is used to fix the connection between the connecting cylinder 3 and the borehole to achieve a secondary sealing effect.

[0024] An extraction pipe 1 is installed inside the connecting cylinder 3. The lower end of the extraction pipe 1 has a collection hole 2. A sealing layer made of rubber material is installed on the inner wall of the connecting cylinder 3 to seal the extraction pipe 1 and the connecting cylinder 3. A connecting pipe 5 is connected to the upper end of the connecting cylinder 3, and a vacuum pump 6 is connected to the connecting pipe 5. A fixing block 15 is fixedly connected to the upper end of the extraction pipe 1. A threaded rod 8 is threaded through the fixing block 15. The threaded rod 8 is rotatably connected to the extraction pipe 1 through a sealed bearing. The sealed bearing is a sealed angular contact ball bearing to withstand axial load. The connecting pipe 5 is limited by a limiting mechanism. The position of the fixing block 15 on the threaded rod 8 is adjusted by adjusting the threaded rod 8, thereby adjusting the position of the extraction pipe 1 inside the connecting cylinder 3. This allows the extraction pipe 1 to be inserted into the ground at different concentrations of methane, avoiding missing high-concentration methane areas and improving extraction efficiency.

[0025] The limiting mechanism includes a limiting rod 14, which passes through a fixed block 15. The upper end of the limiting rod 14 is fixedly connected to the connecting cylinder 3. When the extraction pipe 1 moves, it will drive the fixed block 15 to slide on the limiting rod 14, thereby limiting the extraction pipe 1 and preventing it from rotating. The lower end of the threaded rod 8 is fixedly connected to a stop block 16, which prevents the threaded rod 8 from separating from the fixed block 15. The upper end of the threaded rod 8 is fixedly connected to a rotating part 7, which helps to increase the length of the lever arm so as to drive the threaded rod 8 to rotate.

[0026] During operation, the connecting cylinder 3 is first inserted into the borehole, allowing the sealing part 4 to abut against the inner wall of the borehole for sealing. Then, cement is used to fix and seal the connecting cylinder 3 to the borehole. The vacuum pump 6 then operates to extract the gas along the extraction pipe 1, connecting cylinder 3, and connecting pipe 5, storing it in a storage device. When adjustment is needed, rotating the rotating part 7 drives the threaded rod 8 to rotate. By adjusting the position of the threaded rod 8 in the threaded hole, the extraction pipe 1 is moved longitudinally, thus adjusting the insertion depth of the extraction pipe 1 underground.

[0027] Example 2: In Example 1, when rotating the rotating part 7, the depth to which the extraction pipe 1 is inserted into the ground cannot be clearly known, therefore the extraction depth cannot be determined. (Refer to...) Figure 1-4 In another preferred embodiment of this utility model, based on embodiment 1, a first gear 9 is fixedly connected to the threaded rod 8, and a fixed disk 17 is fixedly connected to the connecting cylinder 3. A rotating shaft 13 is rotatably connected to the upper surface of the fixed disk 17 via a bearing. A second gear 10 is fixedly connected to the rotating shaft 13. The second gear 10 meshes with the first gear 9, and the number of teeth of the second gear 10 is greater than the number of teeth of the first gear 9. An indicating mechanism is provided on the rotating shaft 13. Both the second gear 10 and the first gear 9 are made of plastic material to prevent sparks and avoid dangerous accidents. Through the transmission between the second gear 10 and the first gear 9, the transmission ratio between the second gear 10 and the first gear 9 is controlled so that when the threaded rod 8 rotates to its maximum stroke, the second gear 10 has not rotated more than one revolution, so that the pointer 11 points to the corresponding scale on the scale line 12, thereby knowing the depth of the extraction pipe 1 inserted into the ground.

[0028] The indicating mechanism includes a pointer 11. The pointer 11 is fixedly connected to the upper end of the rotating shaft 13. The fixed disk 17 is provided with a scale line 12. The scale corresponding to the pointer 11 is the depth to which the extraction tube 1 is inserted into the ground.

[0029] When the threaded rod 8 rotates, it drives the first gear 9 to rotate. The first gear 9 drives the second gear 10, causing the pointer 11 to rotate accordingly. When the pointer 11 points to the specified value, the rotating part 7 stops rotating.

[0030] Example 3: Reference Figure 2 and Figure 4 As another preferred embodiment of this utility model, based on embodiment 2, the threaded rod 8 adopts a trapezoidal thread, whose tooth angle provides a larger chip removal space, so that coal dust can automatically fall off along the thread groove and avoid jamming. The surface of the threaded rod 8 is coated with polytetrafluoroethylene, which has an extremely low coefficient of friction, eliminating the risk of spark generation.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A gas extraction device comprising a connection cylinder (3), characterized in that, A sealing part (4) is fixedly connected to the outer wall of the connecting cylinder (3). An extraction pipe (1) is provided inside the connecting cylinder (3). A sealing layer is provided on the inner wall of the connecting cylinder (3). A connecting pipe (5) is connected to the upper end of the connecting cylinder (3). A vacuum pump (6) is connected to the connecting pipe (5). A fixing block (15) is fixedly connected to the upper end of the extraction pipe (1). A threaded rod (8) is threaded through the fixing block (15). The threaded rod (8) is rotatably connected to the extraction pipe (1) through a sealing bearing. The connecting pipe (5) is limited by a limiting mechanism.

2. A gas extraction device according to claim 1, characterised in that The limiting mechanism includes a limiting rod (14), which passes through the fixing block (15), and the upper end of the limiting rod (14) is fixedly connected to the connecting cylinder (3).

3. The gas extraction device of claim 1, wherein, The lower end of the threaded rod (8) is fixedly connected to a stop (16).

4. A gas extraction device according to any one of claims 1-3, characterized in that The upper end of the threaded rod (8) is fixedly connected to a rotating part (7).

5. A gas extraction device according to claim 4, characterised in that A first gear (9) is fixedly connected to the threaded rod (8), a fixed disk (17) is fixedly connected to the connecting cylinder (3), a rotating shaft (13) is rotatably connected to the upper surface of the fixed disk (17) through a bearing, a second gear (10) is fixedly connected to the rotating shaft (13), the second gear (10) meshes with the first gear (9), the number of teeth of the second gear (10) is greater than the number of teeth of the first gear (9), and an indicating mechanism is provided on the rotating shaft (13).

6. A gas extraction device according to claim 5, characterised in that The indicating mechanism includes a pointer (11), the pointer (11) is fixedly connected to the upper end of the rotating shaft (13), and scale lines (12) are provided on the fixed disk (17).

7. A gas extraction device according to claim 6, characterised in that The thread of the threaded rod (8) is a trapezoidal thread, and the surface of the threaded rod (8) is coated with polytetrafluoroethylene.

8. A gas extraction device according to claim 6, characterised in that Both the second gear (10) and the first gear (9) are made of plastic material.

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