Coal seam gas extraction plugging device

Abstract

The utility model relates to a coal bed gas extraction plugging device, including two groups of upper and lower arrangement's plugging cavity, clamping post, transmission assembly and drive assembly, one end of clamping post is connected with the bottom wall of lower plugging cavity, and the other end is connected with the fixed end of transmission assembly and penetrates two groups of plugging cavities, one end of the movable end of transmission assembly is abutted with the top wall of upper plugging cavity, and the other end of movable end is connected with drive assembly, make upper plugging cavity close to lower plugging cavity through transmission assembly, puncture part punctures polyurethane liquid storage bag, and polyurethane liquid mixes and expands, under the restriction of upper and lower plugging cavities, forms the dense plugging layer along the radial diffusion of gas hole and realizes the plugging of gas hole.

Description

Technical Field

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

[0002] Sealing the gas drainage borehole is a crucial step in ensuring safe coal mine production, primarily aimed at preventing accidents caused by residual gas leakage. Existing gas sealing devices use two spaced-apart airbags to create a cavity on the inner wall of the gas borehole. Polyurethane AB liquid is then injected into the cavity through an injection pipe in the upper airbag to react. Constrained by the two airbags, the polyurethane expands radially along the gas borehole, forming a dense sealing layer to block the borehole. However, during implementation, sharp protrusions exist on the inner wall of the gas borehole, which can easily puncture the airbags, causing leakage and preventing the formation of a cavity, thus leading to sealing failure. Utility Model Content

[0003] The purpose of this invention is to provide a coal seam gas extraction and sealing device to solve the aforementioned problems in the existing technology.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A coal seam gas extraction and plugging device includes two sets of plugging cavities arranged vertically, a locking column, a transmission assembly, and a drive assembly; one end of the locking column is connected to the bottom wall of the lower plugging cavity, and the other end passes through both sets of plugging cavities and is connected to the fixed end of the transmission assembly; one end of the movable end of the transmission assembly abuts against the top wall of the upper plugging cavity, and the other end of the movable end is connected to the drive assembly. The top and bottom walls of the sealing cavity are made of rigid circular plates, and the side walls are made of arc-shaped rubber plates. Multiple sets of first polyurethane reservoir bags are arranged circumferentially on the top wall of the lower sealing cavity, and multiple puncture points are provided at the intervals between the multiple sets of first polyurethane reservoir bags. On the bottom wall of the upper sealing cavity, multiple sets of second polyurethane reservoir bags are provided corresponding to the puncture points, and multiple puncture points are provided corresponding to the multiple sets of first polyurethane reservoir bags.

[0005] The beneficial effects of this utility model are: when it is necessary to seal the gas hole to complete the gas extraction, the sealing cavity is placed in the designated position inside the gas hole; the thrust of the drive component is transmitted through the movable end of the transmission component, pushing the top wall of the upper sealing cavity to move downward, while the locking column is connected to the fixed end of the transmission component, so that the bottom wall of the lower sealing cavity remains in the original position. The upper sealing cavity is close to the lower sealing cavity. The puncture part pierces the polyurethane storage bag and then abuts against the corresponding circular plate of the sealing cavity, transferring the thrust to the corresponding circular plate. This causes the arc-shaped plates of the upper and lower sealing cavities to deform, and the arc-shaped plates abut against the inner wall of the gas vent. This process, from the puncture of the polyurethane storage bag by the puncture part, the mixing and reaction of the polyurethane liquid, to the abutment of the arc-shaped plate against the inner wall of the gas vent, restricting the axial diffusion of the polyurethane liquid along the gas vent, is extremely short, making it difficult for the polyurethane liquid to expand axially along the gas vent. After this, the polyurethane liquid mixes and expands, and under the restriction of the upper and lower sealing cavities, it diffuses radially along the gas vent to form a dense sealing layer, thus sealing the gas vent. Based on the above technical solution, the present invention can be further improved as follows.

[0006] Furthermore, the transmission assembly includes a connecting column, an abutting cylinder, and a support plate. One end of the connecting column is connected to a snap-fit ​​column, and the other end is connected to the support plate. The abutting cylinder is sleeved on the connecting column, with one end abutting against the top wall of the upper sealing cavity and the other end having multiple sets of transmission columns. The support plate has through holes corresponding to the transmission columns. The housing of the drive assembly is connected to the support plate, and the output end of the drive assembly is connected to the transmission column.

[0007] Furthermore, the outer wall of the snap-fit ​​post is provided with multiple sets of snap-fit ​​protrusions at the upper sealing cavity, and the top wall of the upper sealing cavity is provided with elastic snap-fit ​​blocks at corresponding positions to the snap-fit ​​protrusions; the connecting post and the snap-fit ​​post are connected by threaded studs.

[0008] Furthermore, a pressure plate is provided at the end of the abutting cylinder opposite to the top wall of the upper sealing cavity.

[0009] Furthermore, the drive assembly also includes a motor, a lead screw module, a control panel, and a display screen. The output end of the motor is connected to the input end of the lead screw module, and the transmission column passes through the housing and is connected to the slider of the lead screw module. The motor and the lead screw module are installed in the holes reserved on the inner wall of the housing. The control panel and the display screen are located on the side wall of the housing and are electrically connected to the motor.

[0010] Furthermore, a pressure sensor is installed between the slider and the transmission column, and the pressure sensor is electrically connected to the display screen.

[0011] Furthermore, the top wall of the lower sealing cavity is provided with abutment protrusions surrounding the snap-fit ​​post.

[0012] Furthermore, the bottom wall of the lower sealing cavity is provided with multiple sets of limiting posts, and the top wall of the lower sealing cavity and the upper sealing cavity are provided with limiting through holes corresponding to the multiple sets of limiting posts.

[0013] Furthermore, multiple sets of limiting posts are equipped with springs, one end of which abuts against the top wall of the lower sealing cavity, and the other end abuts against the bottom wall of the upper sealing cavity. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the overall structure of this utility model in use. Figure 2 for Figure 1 Enlarged view at point A; Figure 3 This is a structural diagram of the present utility model.

[0015] The attached diagram lists the components represented by each number as follows: 1. Sealing cavity; 11. First polyurethane reservoir bag; 12. Puncture section; 13. Second polyurethane reservoir bag; 14. Elastic locking block; 15. Abutting protrusion; 16. Limiting post; 17. Limiting through hole; 18. Spring; 2. Snap-fit ​​post; 21. Snap-fit ​​protrusion; 3. Transmission assembly; 31. Connecting post; 32. Abutting cylinder; 321. Transmission post; 322. Pressure plate; 33. Support plate; 331. Through hole; 4. Drive assembly; 41. Housing; 42. Motor; 43. Screw module; 431. Slider; 44. Control panel; 45. Display screen; 46. Pressure sensor; 5. Gas orifice. Detailed Implementation

[0016] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model. Example 1

[0017] like Figures 1 to 3 As shown, a coal seam gas extraction and sealing device is characterized by comprising two sets of sealing cavities 1 arranged vertically, a locking column 2, a transmission assembly 3, and a drive assembly 4; one end of the locking column 2 is connected to the bottom wall of the lower sealing cavity 1, and the other end passes through both sets of sealing cavities 1 and is connected to the fixed end of the transmission assembly 3; one end of the movable end of the transmission assembly 3 abuts against the top wall of the upper sealing cavity 1, and the other end of the movable end is connected to the drive assembly 4; The top and bottom walls of the sealing cavity 1 are both made of rigid circular plates, and the side walls are made of arc-shaped rubber plates. Multiple sets of first polyurethane reservoir bags 11 are arranged circumferentially on the top wall of the lower sealing cavity 1. Multiple puncture points 12 are provided at the intervals between the multiple sets of first polyurethane reservoir bags 11. On the bottom wall of the upper sealing cavity 1, multiple sets of second polyurethane reservoir bags 13 are provided corresponding to the puncture points 12. Multiple puncture points 12 are provided corresponding to the multiple sets of first polyurethane reservoir bags 11.

[0018] When it is necessary to seal the gas hole 5 to complete the gas extraction, the sealing cavity 1 is placed in the designated position inside the gas hole 5; the thrust of the drive component 4 is transmitted through the movable end of the transmission component 3, pushing the top wall of the upper sealing cavity 1 to move downward, while the locking column 2 is connected to the fixed end of the transmission component 3, so that the bottom wall of the lower sealing cavity 1 remains in its original position. The upper sealing cavity 1 is close to the lower sealing cavity 1. The puncture part 12 punctures the polyurethane storage bag and then abuts against the corresponding circular plate of the sealing cavity 1, transferring the thrust to the corresponding circular plate, thereby squeezing the arc-shaped plates of the upper and lower sealing cavities 1 to deform. The arc-shaped plates abut against the inner wall of the gas pore. This process, from the puncture part 12 puncturing the polyurethane storage bag and the polyurethane liquid mixing and reacting, to the arc-shaped plate abutting against the inner wall of the gas pore and restricting the polyurethane liquid from diffusing along the axial direction of the gas pore, is extremely short and does not easily cause the polyurethane liquid to expand along the axial direction of the gas pore. After this, the polyurethane liquid mixes and expands, and under the restriction of the upper and lower sealing cavities, it diffuses radially along the gas pore to form a dense sealing layer to seal the gas pore. It should be noted that the deformation force of the arc-shaped side plate of the upper sealing cavity 1 is applied to the circular plate and then transmitted to the circular plate of the lower sealing cavity 1 through the puncture part 12. This force is insufficient to cause the puncture part 12 to pierce the circular plate. This solution mainly utilizes the fact that after the arc-shaped side wall is deformed, the arc-shaped plate abuts against the inner wall of the gas hole. The horizontal part can restrict the polyurethane liquid and prevent it from expanding along the axial direction of the gas hole. Therefore, the damage to the side wall does not affect the realization of this function. Furthermore, during the entire sealing process, after the arc-shaped side wall of the sealing cavity 1 is squeezed against the side wall of the gas hole, the displacement relative to the gas hole is very short, and there will be no excessive damage to the arc-shaped side wall. Example 2

[0019] This embodiment is a further improvement on embodiment 1, as detailed below: The transmission assembly 3 includes a connecting column 31, an abutting cylinder 32, and a support plate 33. One end of the connecting column 31 is connected to the snap-fit ​​column 2, and the other end is connected to the support plate 33. The abutting cylinder 32 is sleeved on the connecting column 31. One end of the abutting cylinder 32 abuts against the top wall of the upper sealing cavity 1, and the other end is provided with multiple sets of transmission columns 321. The support plate 33 is provided with through holes 331 corresponding to the transmission columns 321. The housing 41 of the drive assembly 4 is connected to the support plate 33, and the output end of the drive assembly 4 is connected to the transmission column 321.

[0020] The support plate 33 is placed over the opening of the gas hole 5. The output end of the drive component 4 is connected to the transmission column 321, which transmits the thrust to the abutting cylinder 32 and then pushes the upper sealing cavity 1 to move. One end of the connecting column 31 is fixed to the support plate 33, and the other end is connected to the snap-fit ​​column 2, so that the bottom wall of the lower sealing cavity 1 remains in its original position, and the upper sealing cavity 1 is squeezed close to the lower sealing cavity 1, and the side walls of the two sealing cavities 1 deform and abut against the inside of the gas hole 5. Example 3

[0021] This embodiment is a further improvement on embodiment 2, as detailed below: The outer wall of the snap-fit ​​post 2 is provided with multiple sets of snap-fit ​​protrusions 21 at the upper sealing cavity 1, and the top wall of the upper sealing cavity 1 is provided with elastic snap-fit ​​blocks 14 at corresponding positions to the snap-fit ​​protrusions 21; the connecting post 31 is connected to the snap-fit ​​post 2 by threaded studs.

[0022] After sealing is completed, the locking protrusion 21 engages with the elastic locking block 14, ensuring that the arc-shaped sidewall of the sealing cavity 1 is constantly pressed against the inner wall of the gas hole, thus guaranteeing stable support for the upper and lower sealing cavities 1 and improving the reliability of sealing. It should be noted that the elastic locking block 14 is set upwards, and the gap opening of the locking protrusion 21 faces downwards, so that the downward movement of the upper sealing cavity 1 relative to the locking post 2 is not affected, only the upward movement of the upper sealing cavity 1 relative to the locking post 2 is restricted. The connecting post 31 and the locking post 2 are connected by a threaded stud. After sealing is completed, the transmission component 3 can be rotated to separate the transmission component 3 from the locking post 2, and the transmission component 3 can be removed. This ensures that the gas hole 5 is sealed while effectively reducing the cost of sealing. Example 4

[0023] This embodiment is a further improvement on embodiment 2, as detailed below: A pressure plate 322 is provided at the end of the cylinder 32 that is opposite to the top wall of the upper sealing cavity 1.

[0024] By using a pressure plate 322, the thrust can be applied more evenly to the upper sealing cavity 1, making the sealing process more stable. Example 5

[0025] This embodiment is a further improvement on embodiment 2, as detailed below: The drive assembly 4 also includes a motor 42, a lead screw module 43, a control panel 44, and a display screen 45. The output end of the motor 42 is connected to the input end of the lead screw module 43. The transmission column 321 passes through the housing 41 and is connected to the slider 431 of the lead screw module 43. The motor 42 and the lead screw module 43 are installed in the holes reserved on the inner wall of the housing 41. The control panel 44 and the display screen 45 are located on the side wall of the housing and are electrically connected to the motor 42.

[0026] Motor 42 drives lead screw module 43, and the slider 431 of lead screw module 43 pushes transmission column 321 to realize the transmission of thrust, thereby squeezing the two sealing cavities 1 through transmission component 3 to achieve sealing; control panel 44 controls the operation of motor 42, and display screen 45 displays the operating status of motor.

[0027] A pressure sensor 46 is provided between the slider 431 and the transmission column 321, and the pressure sensor 46 is electrically connected to the display screen 45.

[0028] The pressure value measured by the pressure sensor 46 is displayed on the display screen 45. When the preset pressure value is reached, it indicates that the sealing requirement is met, and the motor is stopped by the controller. It should be noted that this pressure value is measured by simulation experiment. The sealing test is conducted in a simulated hole that can be observed externally to test the pressure value at which the sealing meets the standard. Example 6

[0029] This embodiment is a further improvement on embodiment 1, as detailed below: The top wall of the lower sealing cavity 1 is provided with abutment protrusions 15 surrounding the snap-fit ​​post 2.

[0030] By setting the abutting protrusion 15, when the two sealing cavities 1 move and squeeze relative to each other, it can effectively prevent abnormal force from causing the puncture part 12 to puncture the circular plate corresponding to the sealing cavity 1. The two sealing cavities 1 are spaced apart to ensure that the two polyurethane liquids are mixed and the resulting dense sealing layer has a certain thickness, which can further improve the sealing effect; in specific implementation, the height of the abutment protrusion 15 is lower than the height of the puncture part 12. Example 7

[0031] This embodiment is a further improvement on embodiment 1, as detailed below: Multiple sets of limiting posts 16 are provided on the bottom wall of the lower sealing cavity 1, and limiting through holes 17 are provided on the top wall of the lower sealing cavity 1 and the upper sealing cavity 1 corresponding to the multiple sets of limiting posts 16.

[0032] By setting multiple sets of limiting posts 16, it is possible to effectively prevent the two sealing cavities 1 from rotating when they move relative to each other, thereby further improving the stability of the structure; in the specific implementation, there are two sets of limiting posts.

[0033] Multiple sets of limiting posts 16 are equipped with springs 18. One end of the spring 18 abuts against the top wall of the lower sealing cavity 1, and the other end abuts against the bottom wall of the upper sealing cavity 1.

[0034] By setting spring 18, the elastic force of spring 18 is greater than the deformation force of the side wall of the sealing cavity 1; the side wall of the sealing cavity 1 deforms before the puncture part 12 punctures the polyurethane storage bag, which can effectively reduce the loss of polyurethane liquid and further improve the sealing effect.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A coal seam gas extraction and plugging device, characterized in that, It includes two sets of sealing cavities (1) arranged vertically, a snap-fit ​​post (2), a transmission assembly (3), and a drive assembly (4); one end of the snap-fit ​​post (2) is connected to the bottom wall of the lower sealing cavity (1), and the other end passes through the two sets of sealing cavities (1) and is connected to the fixed end of the transmission assembly (3); one end of the movable end of the transmission assembly (3) abuts against the top wall of the upper sealing cavity (1), and the other end of the movable end is connected to the drive assembly (4); The top and bottom walls of the sealing cavity (1) are both hard circular plates, and the side walls are arc-shaped rubber plates. Multiple sets of first polyurethane storage bags (11) are arranged circumferentially on the top wall of the lower sealing cavity (1). Multiple puncture parts (12) are provided at the intervals between the multiple sets of first polyurethane storage bags (11). On the bottom wall of the upper sealing cavity (1), multiple sets of second polyurethane storage bags (13) are provided corresponding to the puncture parts (12), and multiple puncture parts (12) are provided corresponding to the multiple sets of first polyurethane storage bags (11).

2. The coal seam gas extraction and plugging device according to claim 1, characterized in that, The transmission assembly (3) includes a connecting column (31), an abutting cylinder (32), and a support plate (33). One end of the connecting column (31) is connected to the snap-fit ​​column (2), and the other end is connected to the support plate (33). The abutting cylinder (32) is sleeved on the connecting column (31). One end of the abutting cylinder (32) abuts against the top wall of the upper sealing cavity (1), and the other end is provided with multiple sets of transmission columns (321). The support plate (33) is provided with through holes (331) corresponding to the transmission columns (321). The outer shell (41) of the drive assembly (4) is connected to the support plate (33), and the output end of the drive assembly (4) is connected to the transmission column (321).

3. The coal seam gas extraction and plugging device according to claim 2, characterized in that, The outer wall of the snap-fit ​​post (2) is provided with multiple snap-fit ​​protrusions (21) at the upper sealing cavity (1), and the top wall of the upper sealing cavity (1) is provided with elastic snap-fit ​​blocks (14) to match the snap-fit ​​protrusions (21); the connecting post (31) and the snap-fit ​​post (2) are connected by threaded studs.

4. The coal seam gas extraction and plugging device according to claim 2, characterized in that, The end of the abutting cylinder (32) opposite to the top wall of the upper sealing cavity (1) is provided with a pressure plate (322).

5. The coal seam gas extraction and plugging device according to claim 2, characterized in that, The drive assembly (4) also includes a motor (42), a lead screw module (43), a control panel (44), and a display screen (45). The output end of the motor (42) is connected to the input end of the lead screw module (43). The transmission column (321) passes through the housing (41) and is connected to the slider (431) of the lead screw module (43). The motor (42) and the lead screw module (43) are installed in the holes reserved on the inner wall of the housing (41). The control panel (44) and the display screen (45) are located on the side wall of the housing and are electrically connected to the motor (42).

6. The coal seam gas extraction and plugging device according to claim 5, characterized in that, A pressure sensor (46) is provided between the slider (431) and the transmission column (321), and the pressure sensor (46) is electrically connected to the display screen (45).

7. The coal seam gas extraction and plugging device according to claim 1, characterized in that, The top wall of the lower sealing cavity (1) is provided with an abutment protrusion (15) surrounding the snap-fit ​​post (2).

8. The coal seam gas extraction and plugging device according to claim 1, characterized in that, The bottom wall of the lower sealing cavity (1) is provided with multiple sets of limiting posts (16), and the top wall of the lower sealing cavity (1) and the upper sealing cavity (1) are provided with limiting through holes (17) corresponding to the multiple sets of limiting posts (16).

9. The coal seam gas extraction and plugging device according to claim 8, characterized in that, Each of the multiple sets of limiting posts (16) is provided with a spring (18), one end of which abuts against the top wall of the lower sealing cavity (1) and the other end abuts against the bottom wall of the upper sealing cavity (1).

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