High-efficiency gas extraction device and extraction method for low-permeability coal seam

Abstract

The present invention discloses a low-permeability coal seam gas efficient extraction device and extraction method, which relates to the technical field of gas extraction, including drilling and also including an adjusting device, wherein a sealing plate is fixedly installed on the inner wall of the drilling well, and extraction pipes are fixedly penetrated through the upper and lower walls of the sealing plate, and extraction equipment is arranged on the top of the extraction pipe, and a movable tube is slidably installed on the inner wall of the extraction equipment, wherein the adjusting device comprises an adjusting groove, a U-shaped frame, an adjusting rod, a movable ring, an adjusting hole, a placement groove, an arc surface block, an arc surface plate and a linkage plate, and the movable tube moves downward to drive the movable ring to move downward, and the movable ring moves downward to scrape the inner wall of the drilling well, thereby destroying the microscopic coal seam structure of the inner wall of the drilling well, and by scraping the surface of the coal seam at different depths, the microstructure of the coal seam can be destroyed, and the cracks in the coal seam can be increased, thereby increasing the efficiency of gas extraction.

Description

Technical Field

[0001] This invention relates to the field of gas extraction technology, specifically to a high-efficiency gas extraction device and method for low-permeability coal seams. Background Technology

[0002] High-efficiency coalbed methane extraction devices for low-permeability coal seams typically consist of extraction equipment, control equipment, detection equipment, and protective equipment. Most coalbed methane storage areas are low-permeability coal seams, making pre-extraction of coalbed methane difficult and ineffective. Therefore, researchers have studied low-permeability coalbed methane extraction technology. The basic starting point of this research is to improve coal seam permeability or increase the borehole length per unit coal body to increase the extraction rate. However, increasing the borehole length per unit coal body can easily cause some of the methane gas stored in the coal seam to leak into the atmosphere. This not only seriously affects the human living environment but also wastes a large amount of non-renewable energy. Therefore, how to improve coal seam permeability by cracking the internal rock strata of the mine has become an important research direction for researchers.

[0003] Patent publication number CN219754510U relates to a high-efficiency gas extraction device for low-permeability coal seams, comprising: a gas extraction mechanism; an outer protective pipe, the top end of which is fixedly installed on the bottom surface of the gas extraction mechanism, and the bottom end of which extends into the well; an outer support ring fixedly fitted on the top of the outer protective pipe, the outer wall of which is in close contact with the inner wall of the well; and an extraction pipe disposed inside the outer protective pipe, the top end of which is fixedly connected to the extraction end of the gas extraction mechanism. This patent includes a rock stratum cracking component installed at the bottom of the outer protective pipe. When the electric cylinder is in the retracted state, the spring is compressed and deformed under pressure. When the electric cylinder extends instantaneously, it rapidly pushes the impact plate outward. Simultaneously, under the tension of the spring, the outward pushing force of the impact plate is enhanced, thereby impacting the surrounding rock strata, creating cracks in the rock strata, increasing the gas permeability of the rock strata, and thus improving the gas extraction efficiency.

[0004] In the aforementioned patent, a rock strata cracking component is installed at the bottom of the outer protective pipe. When the electric cylinder is in the retracted state, the spring is compressed and deformed under pressure. When the electric cylinder extends instantaneously, it pushes the impact plate outward rapidly. At the same time, under the tension of the spring, the outward pushing force of the impact plate is enhanced, thereby impacting the surrounding rock strata, causing cracks in the rock strata, improving the gas permeability of the rock strata, and thus improving the gas extraction efficiency. However, it is difficult to scrape and push coal seams at different depths. If it is not possible to scrape coal seams at different depths, the gas will be difficult to release smoothly, affecting the extraction effect and thus reducing the amount of gas released. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a high-efficiency gas extraction device and method for low-permeability coal seams, solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency coal seam gas extraction device with low permeability, comprising a well and an adjustment device. A sealing plate is fixedly installed on the inner wall of the well, and extraction pipes are fixedly passed through the upper and lower walls of the sealing plate. An extraction device is installed at the top of the extraction pipe, and a movable pipe is slidably installed on the inner wall of the extraction device. The adjustment device includes an adjustment groove, a U-shaped frame, an adjustment rod, a movable ring, an adjustment hole, a placement groove, an arc-shaped block, an arc-shaped panel, and a linkage plate. The downward movement of the movable pipe causes the movable ring to move downwards. The downward movement scrapes against the inner wall of the well, thereby damaging the microscopic coal seam structure of the inner wall. The adjustment groove is opened on the circumference of the moving pipe, the U-shaped frame is fixedly installed on the circumference of the extraction pipe, the adjustment rod slides through the inner and outer walls of the U-shaped frame, the moving ring is fixedly installed through the inner and outer walls of the moving pipe, the adjustment hole is opened on the circumference of the extraction pipe, the placement groove is opened on the circumference of the moving pipe, the arc block is fixedly installed on the inner wall of the placement groove, the arc panel is fixedly installed on the circumference of the extraction pipe, and a button is fixedly installed on the top of the extraction equipment, the button being electrically connected to the extraction equipment.

[0007] According to the above technical solution, a No. 1 spring is provided between the linkage plate and the U-shaped frame. The No. 1 spring can drive the linkage plate to reset. The arc block contacts the arc panel, and the moving ring contacts the inner wall of the well.

[0008] According to the above technical solution, the adjusting rod contacts the inner wall of the adjusting groove, the arc panel is elastic, and a first rubber ring is provided between the extraction pipe and the moving pipe. The first rubber ring can increase the sealing between the extraction pipe and the moving pipe.

[0009] According to the above technical solution, a sealing device to prevent gas leakage is provided on the circumferential surface of the well, and a detection device is provided on the right side of the U-shaped frame. The sealing device includes a support groove, a support plate, a support rod, an L-shaped plate, a sealing frame, a load-bearing groove, and a load-bearing rod. The sealing frame moves to contact the adjustment hole and seals the connection between the moving pipe and the extraction pipe. The support groove is opened on the circumferential surface of the well, the support plate is fixedly installed on the inner wall of the support groove, the support rod slides through the left and right walls of the support plate, the L-shaped plate is fixedly installed at both ends of the support rod, the sealing frame is fixedly installed on the left side of the L-shaped plate, the load-bearing groove is opened on the front side of the U-shaped frame, the load-bearing rod is fixedly installed on the front side of the sealing frame, the sealing frame contacts the inner wall of the adjustment hole, and the side of the sealing frame that contacts the extraction pipe is made of rubber.

[0010] According to the above technical solution, the L-shaped plate is in contact with the linkage plate, and a second spring is provided between the support plate and the L-shaped plate. The second spring can drive the L-shaped plate to reset, and the load-bearing rod is in contact with the inner wall of the load-bearing groove.

[0011] According to the above technical solution, the detection device includes a U-shaped tube, a detection plate, a detection rod, a limiting plate, a limiting rod, and a protective groove. The limiting rod moves and contacts the inner wall of the protective groove, limiting the button. The button is limited by the limiting rod and cannot be pressed. The U-shaped tube is fixedly installed on the right side of the U-shaped frame. The detection plate is slidably installed on the inner wall of the U-shaped tube. The detection rod is fixedly installed on the left side of the detection plate. The limiting plate is slidably installed on the inner wall of the U-shaped tube. The limiting rod is fixedly installed on the left side of the limiting plate. The protective groove is formed on the circumferential surface of the button.

[0012] According to the above technical solution, the U-shaped tube contains liquid, and a No. 3 spring is provided between the U-shaped tube and the detection plate. The No. 3 spring can drive the detection plate to reset, and the detection rod passes through the inner and outer walls of the U-shaped tube.

[0013] According to the above technical solution, a second rubber ring is provided between the detection rod and the U-shaped tube, which can increase the sealing between the detection rod and the U-shaped tube. A third rubber ring is provided between the limiting plate and the U-shaped tube, which can increase the sealing between the limiting plate and the U-shaped tube. The detection rod is in contact with the load-bearing rod.

[0014] The extraction method of a low-permeability coal seam gas high-efficiency extraction device, using the aforementioned low-permeability coal seam gas high-efficiency extraction device, includes the following steps:

[0015] Step 1: When it is necessary to adjust the depth of gas extraction, first manually pull the linkage plate to move it away from the extraction pipeline. The movement of the linkage plate away from the extraction pipeline will drive the adjustment rod to move.

[0016] Step 2: Move the adjusting rod away from the extraction pipeline to disengage from the adjusting groove and release the restriction on the moving pipe. After the restriction on the moving pipe is released, manually push the moving pipe downward to adjust the depth.

[0017] Step 3: When the moving tube has moved to the appropriate depth, release the linkage plate so that the linkage plate moves towards the extraction pipe under the elastic force of the No. 1 spring. The movement of the linkage plate towards the extraction pipe drives the adjusting rod to move. The adjusting rod moves and contacts the inner wall of the adjusting groove and restores the limit on the moving tube.

[0018] Step 4: After the moving tube is adjusted to the appropriate depth, manually press the button to drive the extraction equipment to extract the gas inside the well.

[0019] This invention provides a high-efficiency coal seam gas extraction device with low permeability. It has the following beneficial effects:

[0020] (1) In this invention, the depth is adjusted by manually pushing the moving pipe downward after the limit of the moving pipe is released. The adjustable length of the pipe can be adjusted according to the actual situation on site, thereby ensuring that the extraction equipment is always in the best working state. The downward movement of the moving pipe drives the moving ring to move downward. The downward movement of the moving ring scrapes the inner wall of the well, thereby destroying the micro-coal seam structure of the inner wall of the well. By scraping the surface of the coal seam at different depths, the micro-structure of the coal seam can be destroyed, increasing the cracks in the coal seam, thereby increasing the efficiency of gas extraction. The vibration of the arc block drives the vibration of the moving pipe, and the vibration of the moving pipe drives the moving ring to resonate together. The resonance of the moving ring further enhances the effect of increasing the cracks in the coal seam.

[0021] (2) In this invention, the L-shaped plate moves towards the U-shaped frame to reset and drive the sealing frame to move. The moving sealing frame contacts the adjustment hole and seals the connection between the moving pipe and the extraction pipe. By improving the airtightness of the gas fluid when it flows in the extraction pipe, the extraction efficiency can be maximized, thereby ensuring that more gas is extracted. The moving sealing frame drives the load-bearing rod to move. The moving load-bearing rod, together with the load-bearing groove, supports the sealing frame, thereby ensuring the sealing effect of the sealing frame. Through the cooperation of the load-bearing rod and the load-bearing groove, it can be ensured that the sealing frame is always in the correct position and under stress, thereby effectively preventing the sealing frame from shifting and further ensuring the long-term stability of the sealing effect.

[0022] (3) In this invention, the limiting plate moves towards the button under the pressure of the liquid inside the U-shaped tube. The movement of the limiting plate towards the button causes the limiting rod to move. The moving limiting rod contacts the inner wall of the protective groove and limits the button. The button cannot be pressed due to the limitation of the limiting rod. By limiting the button with the limiting rod, it is ensured that the extraction equipment can only be started after the moving tube is adjusted. This avoids the normal gas extraction process from being disturbed by the button being accidentally touched by external force, and further ensures the stability and effectiveness of the gas extraction operation. Attached Figure Description

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of the well drilling system according to the present invention;

[0025] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of section A in the middle;

[0026] Figure 4 This is a schematic diagram showing the location and structure of the extraction pipeline and extraction equipment of the present invention;

[0027] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of section B;

[0028] Figure 6 This is a schematic diagram showing the positional structure of the support rod and the L-shaped plate of the present invention;

[0029] Figure 7 This is a schematic diagram of the internal structure of the U-shaped tube of the present invention.

[0030] In the diagram: 1. Drilling well; 2. Sealing plate; 3. Extraction pipeline; 4. Extraction equipment; 5. Moving pipe; 6. Adjustment groove; 7. U-shaped frame; 8. Adjustment rod; 9. Moving ring; 10. Adjustment hole; 11. Placement groove; 12. Arc block; 13. Arc panel; 14. Linkage plate; 151. Support groove; 152. Support plate; 153. Support rod; 154. L-shaped plate; 155. Sealing frame; 156. Load-bearing groove; 157. Load-bearing rod; 161. U-shaped pipe; 162. Detection plate; 163. Detection rod; 164. Limiting plate; 165. Limiting rod; 166. Button; 167. Protective groove. Detailed Implementation

[0031] 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figures 1-6One embodiment of the present invention is: a high-efficiency gas extraction device for low-permeability coal seams, comprising a well 1 and an adjustment device. A sealing plate 2 is fixedly installed on the inner wall of the well 1. Extraction pipes 3 are fixedly passed through the upper and lower walls of the sealing plate 2. An extraction device 4 is installed at the top of the extraction pipe 3. A movable pipe 5 is slidably installed on the inner wall of the extraction device 4. The adjustment device includes an adjustment groove 6, a U-shaped frame 7, an adjustment rod 8, a movable ring 9, an adjustment hole 10, a placement groove 11, an arc-shaped block 12, an arc-shaped panel 13, and a linkage plate 14. The adjustment groove 6 is formed on the circumferential surface of the movable pipe 5. The U-shaped frame 7 is fixedly installed on the circumferential surface of the extraction pipe 3. The adjustment rod 8 slidably passes through the U-shaped frame 7. The outer wall, the moving ring 9 is fixedly inserted through the inner and outer walls of the moving pipe 5, the adjustment hole 10 is opened on the circumferential surface of the extraction pipe 3, the placement groove 11 is opened on the circumferential surface of the moving pipe 5, the arc block 12 is fixedly installed on the inner wall of the placement groove 11, the arc panel 13 is fixedly installed on the circumferential surface of the extraction pipe 3, and the top of the extraction equipment 4 is fixedly installed with a button 166. The button 166 is electrically connected to the extraction equipment 4. It can be adjusted according to the actual situation on site through the adjustable length pipe, so as to ensure that the extraction equipment 4 always maintains the best working condition. By scraping the surface of the coal seam at different depths, the microstructure of the coal seam can be destroyed, the cracks in the coal seam can be increased, thereby increasing the efficiency of gas extraction.

[0033] A first spring is provided between the linkage plate 14 and the U-shaped frame 7. The linkage plate 14 can be reset by the first spring, the arc block 12 contacts the arc panel 13, and the moving ring 9 contacts the inner wall of the drilling rig 1.

[0034] The adjusting rod 8 contacts the inner wall of the adjusting groove 6, the arc panel 13 is elastic, and a No. 1 rubber ring is provided between the extraction pipe 3 and the moving pipe 5. The No. 1 rubber ring can increase the sealing between the extraction pipe 3 and the moving pipe 5.

[0035] The extraction method of a low-permeability coal seam gas high-efficiency extraction device, using the aforementioned low-permeability coal seam gas high-efficiency extraction device, includes the following steps:

[0036] Step 1: When it is necessary to adjust the depth of gas extraction, first manually pull the linkage plate 14 to move away from the extraction pipeline 3. The movement of the linkage plate 14 away from the extraction pipeline 3 will drive the adjustment rod 8 to move.

[0037] Step 2: Move the adjusting rod 8 away from the extraction pipe 3 to disengage from the adjusting groove 6 and release the restriction on the moving pipe 5. After the restriction on the moving pipe 5 is released, manually push the moving pipe 5 downward to adjust the depth.

[0038] Step 3: When the moving tube 5 moves to the appropriate depth, release the linkage plate 14 so that the linkage plate 14 moves towards the extraction pipe 3 under the elastic force of the first spring. The movement of the linkage plate 14 towards the extraction pipe 3 drives the adjusting rod 8 to move. The adjusting rod 8 moves and contacts the inner wall of the adjusting groove 6 and restores the limit on the moving tube 5.

[0039] Step 4: After the moving tube 5 is adjusted to the appropriate depth, manually press button 166 to drive the extraction device 4 to extract the gas inside the well 1.

[0040] In this embodiment, when adjusting the gas extraction depth, first manually pull the linkage plate 14 away from the extraction pipe 3. This movement pulls the first spring, causing it to deform. Simultaneously, the movement of the linkage plate 14 away from the extraction pipe 3 moves the adjusting rod 8, disengaging it from the adjusting groove 6 and releasing the restriction on the moving pipe 5. After the restriction on the moving pipe 5 is released, manually push the moving pipe 5 downwards using a tool matching the size of the adjusting groove 6 to adjust the depth. When the moving pipe 5 reaches the appropriate depth, release the linkage plate 14, allowing it to move closer to the extraction pipe under the elastic force of the first spring. When the moving pipe 5 moves in the direction of 3, the linkage plate 14 moves closer to the extraction pipe 3, which drives the adjusting rod 8 to move. The adjusting rod 8 moves and contacts the inner wall of the adjusting groove 6 and restores the limit on the moving pipe 5. When the moving pipe 5 is manually pushed downward, the moving pipe 5 moves downward, which drives the moving ring 9 to move downward. The moving ring 9 moves downward and scrapes the inner wall of the well 1, thereby destroying the micro-coal seam structure of the inner wall of the well 1. At the same time, the moving pipe 5 moves downward, which drives the arc block 12 to move downward. The arc block 12 moves downward and contacts the arc panel 13, generating vibration. The vibration of the arc block 12 drives the moving pipe 5 to vibrate. The vibration of the moving pipe 5 drives the moving ring 9 to resonate together. After the moving pipe 5 is adjusted to a suitable depth, the button 166 is manually pressed to drive the extraction equipment 4 to extract the gas inside the well 1.

[0041] Please see Figures 1-7Based on the above embodiments, in another embodiment of the present invention, a sealing device to prevent gas leakage is provided on the circumferential surface of the well 1, and a detection device is provided on the right side of the U-shaped frame 7. The sealing device includes a support groove 151, a support plate 152, a support rod 153, an L-shaped plate 154, a sealing frame 155, a load-bearing groove 156, and a load-bearing rod 157. The support groove 151 is formed on the circumferential surface of the well 1, the support plate 152 is fixedly installed on the inner wall of the support groove 151, the support rod 153 slides through the left and right walls of the support plate 152, and the L-shaped plate 154 is fixedly installed at both ends of the support rod 153. The sealing frame 155 is fixedly installed on the left side of the L-shaped plate 154, the load-bearing groove 156 is opened on the front side of the U-shaped frame 7, and the load-bearing rod 157 is fixedly installed on the front side of the sealing frame 155. The sealing frame 155 is in contact with the inner wall of the adjusting hole 10. The side of the sealing frame 155 that is in contact with the extraction pipe 3 is made of rubber. By improving the airtightness of the gas fluid when it flows in the extraction pipe 3, the extraction efficiency can be maximized, thereby ensuring that more gas is extracted. Through the cooperation of the load-bearing rod 157 and the load-bearing groove 156, it can be ensured that the sealing frame 155 is always in the correct position and under stress.

[0042] L-shaped plate 154 contacts linkage plate 14. A second spring is provided between support plate 152 and L-shaped plate 154. The second spring can drive L-shaped plate 154 to reset. The load-bearing rod 157 contacts the inner wall of load-bearing groove 156. There are two sets of load-bearing grooves 156 and load-bearing rods 157. In the other set, the load-bearing groove 156 is opened on the rear side of U-shaped frame 7, and the load-bearing rod 157 is fixedly installed on the rear side of sealing frame 155.

[0043] The detection device includes a U-shaped tube 161, a detection plate 162, a detection rod 163, a limiting plate 164, a limiting rod 165, and a protective groove 167. The U-shaped tube 161 is fixedly installed on the right side of the U-shaped frame 7. The detection plate 162 is slidably installed on the inner wall of the U-shaped tube 161. The detection rod 163 is fixedly installed on the left side of the detection plate 162. The limiting plate 164 is slidably installed on the inner wall of the U-shaped tube 161. The limiting rod 165 is fixedly installed on the left side of the limiting plate 164. The protective groove 167 is opened on the circumferential surface of the button 166. The button 166 is limited by the limiting rod 165 to ensure that the extraction equipment 4 can only be started after the moving tube 5 has been adjusted. This avoids the normal gas extraction process from being disturbed by the button 166 being accidentally touched by external force, and further ensures the stability and effectiveness of the gas extraction operation.

[0044] The U-shaped tube 161 contains liquid, and a No. 3 spring is installed between the U-shaped tube 161 and the detection plate 162. The No. 3 spring can drive the detection plate 162 to reset, and the detection rod 163 passes through the inner and outer walls of the U-shaped tube 161.

[0045] A second rubber ring is provided between the detection rod 163 and the U-shaped tube 161 to increase the sealing between them. A third rubber ring is provided between the limiting plate 164 and the U-shaped tube 161 to increase the sealing between them. The detection rod 163 is in contact with the load-bearing rod 157.

[0046] In this embodiment, during operation: The linkage plate 14 is manually pulled to move away from the extraction pipe 3. The linkage plate 14 moves away from the extraction pipe 3 and contacts the L-shaped plate 154, pressing it. The L-shaped plate 154, pressed by the linkage plate 14, moves away from the U-shaped frame 7. This movement pulls the second spring, causing it to deform and store force. Simultaneously, the movement of the L-shaped plate 154 away from the U-shaped frame 7 drives the sealing frame 155 to move. The sealing frame 155 moves away from the U-shaped frame 7, disengaging from the adjusting hole 10 and the moving tube 5, thus facilitating depth adjustment of the moving tube 5. The linkage plate 14 then moves away from the first spring... When the L-shaped plate 154 moves towards the extraction pipe 3 under the elastic force, it moves towards the extraction pipe 3 and disengages from the L-shaped plate 154. After the L-shaped plate 154 disengages from the linkage plate 14, it moves towards the U-shaped frame 7 under the elastic force of the second spring. The movement of the L-shaped plate 154 towards the U-shaped frame 7 causes the sealing frame 155 to move. The sealing frame 155 moves and contacts the adjustment hole 10, sealing the connection between the moving pipe 5 and the extraction pipe 3. At the same time, the movement of the sealing frame 155 causes the load-bearing rod 157 to move. The movement of the load-bearing rod 157, together with the load-bearing groove 156, supports the sealing frame 155, thereby ensuring the sealing effect of the sealing frame 155.

[0047] The sealing frame 155 moves away from the U-shaped frame 7, causing the load-bearing rod 157 to move. The load-bearing rod 157 moves and contacts the detection rod 163, squeezing it. The detection rod 163, squeezed by the load-bearing rod 157, moves away from the extraction pipe 3. This movement of the detection rod 163 also moves the detection plate 162, squeezing the third spring. The third spring deforms and stores force due to the tension of the detection plate 162. Simultaneously, the detection plate 162 moves away from the extraction pipe 3, allowing the liquid inside the U-shaped tube 161 to pass through. When the liquid inside the U-shaped tube 161 is squeezed by the detection plate 162, it moves towards the limiting plate 164. The liquid inside the U-shaped tube 161 moves towards the limiting plate 164 and squeezes the limiting plate 164. The limiting plate 164, squeezed by the liquid inside the U-shaped tube 161, moves towards the button 166. The movement of the limiting plate 164 towards the button 166 causes the limiting rod 165 to move. The limiting rod 165 moves and contacts the inner wall of the protective groove 167, limiting the button 166. The button 166 is limited by the limiting rod 165 and cannot be pressed.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-permeability coal seam gas efficient extraction device, comprising a drilling well (1), characterized in that: Also includes an adjustment device; A sealing plate (2) is fixedly mounted on the inner wall of the wellbore (1); an extraction pipe (3) is fixedly penetrated through the upper and lower walls of the sealing plate (2); an extraction device (4) is arranged on the top of the extraction pipe (3); and a moving pipe (5) is slidably mounted on the inner wall of the extraction device (4); The adjusting device comprises an adjusting groove (6), a U-shaped frame (7), an adjusting rod (8), a moving ring (9), an adjusting hole (10), a placement groove (11), an arc surface block (12), an arc plate (13) and a linkage plate (14); the adjusting groove (6) is formed on the circumferential surface of the moving tube (5); the U-shaped frame (7) is fixedly mounted on the circumferential surface of the extraction pipe (3); the adjusting rod (8) slides through the inner and outer walls of the U-shaped frame (7); the moving ring (9) is fixedly mounted on the inner and outer walls of the moving pipe (5); the adjusting hole (10) is formed on the circumferential surface of the extraction pipe (3); the placement groove (11) is formed on the circumferential surface of the moving tube (5); the arc surface block (12) is fixedly mounted on the inner wall of the placement groove (11); the arc plate (13) is fixedly mounted on the circumferential surface of the extraction pipe (3); a button (166) is fixedly mounted on the top of the extraction device (4); the button (166) is electrically connected to the extraction device (4); The circumferential surface of the drilling well (1) is provided with a sealing device for preventing gas leakage, and the right side of the U-shaped frame (7) is provided with a detection device.

2. The low-permeability coal seam gas efficient extraction device according to claim 1 is characterized in that: A No. 1 spring is provided between the linkage plate (14) and the U-shaped frame (7), the arc surface block (12) is in contact with the arc surface plate (13), and the movable ring (9) is in contact with the inner wall of the wellbore (1).

3. The low permeability coal seam gas efficient extraction device according to claim 2 is characterized in that: The adjusting rod (8) is in contact with the inner wall of the adjusting groove (6), the arc panel (13) is elastic, and a No. 1 rubber ring is provided between the extraction pipe (3) and the moving pipe (5).

4. The low-permeability coal seam gas efficient extraction device according to claim 3 is characterized by: The sealing device comprises a support groove (151), a support plate (152), a support rod (153), an L-shaped plate (154), a sealing frame (155), a load-bearing groove (156) and a load-bearing rod (157); the support groove (151) is formed on the circumferential surface of the drilling well (1); the support plate (152) is fixedly mounted on the inner wall of the support groove (151); the support rod (153) slides through the left and right walls of the support plate (152); the L-shaped plate (154) is fixedly mounted on both ends of the support rod (153); the sealing frame (155) is fixedly mounted on the left side of the L-shaped plate (154); the load-bearing groove (156) is formed on the front side of the U-shaped frame (7); the load-bearing rod (157) is fixedly mounted on the front side of the sealing frame (155); and the sealing frame (155) contacts the inner wall of the adjustment hole (10).

5. The low permeability coal seam gas efficient extraction device according to claim 4 is characterized in that: The L-shaped plate (154) is in contact with the linkage plate (14), a No. 2 spring is provided between the support plate (152) and the L-shaped plate (154), and the load-bearing rod (157) is in contact with the inner wall of the load-bearing groove (156).

6. The low-permeability coal seam gas efficient extraction device according to claim 5 is characterized in that: The detection device comprises a U-shaped tube (161), a detection plate (162), a detection rod (163), a limit plate (164), a limit rod (165) and a protective groove (167); the U-shaped tube (161) is fixedly mounted on the right side of the U-shaped frame (7); the detection plate (162) is slidably mounted on the inner wall of the U-shaped tube (161); the detection rod (163) is fixedly mounted on the left side of the detection plate (162); the limit plate (164) is slidably mounted on the inner wall of the U-shaped tube (161); the limit rod (165) is fixedly mounted on the left side of the limit plate (164); and the protective groove (167) is provided on the circumferential surface of the button (166).

7. The low-permeability coal seam gas efficient extraction device according to claim 6 is characterized by: Liquid is arranged inside the U-shaped tube (161), a No. 3 spring is arranged between the U-shaped tube (161) and the detection plate (162), and the detection rod (163) penetrates the inner and outer walls of the U-shaped tube (161).

8. The low-permeability coal seam gas efficient extraction device according to claim 7 is characterized by: A No. 2 rubber ring is provided between the detection rod (163) and the U-shaped tube (161), a No. 3 rubber ring is provided between the limit plate (164) and the U-shaped tube (161), and the detection rod (163) is in contact with the load-bearing rod (157).

9. A method for extracting gas from a low-permeability coal seam using a high-efficiency extraction device for extracting gas from a low-permeability coal seam, using the high-efficiency extraction device for extracting gas from a low-permeability coal seam according to claim 8, characterized in that: The following steps are involved: Step 1: When the depth of gas extraction needs to be adjusted, the linkage plate (14) is first manually pulled to move in a direction away from the extraction pipeline (3). The linkage plate (14) moves in a direction away from the extraction pipeline (3), thereby driving the adjustment rod (8) to move; Step 2: the adjusting rod (8) moves away from the extraction pipe (3) to break away from the contact with the adjusting groove (6) and release the limit on the movable tube (5); after the limit on the movable tube (5) is released, the movable tube (5) is manually pushed downward to adjust the depth; Step 3: When the movable tube (5) moves to a suitable depth, the linkage plate (14) is released so that the linkage plate (14) moves toward the extraction pipe (3) under the elastic force of the first spring. The linkage plate (14) moves toward the extraction pipe (3) to drive the adjustment rod (8) to move. The adjustment rod (8) moves to contact the inner wall of the adjustment groove (6) and restores the limit position of the movable tube (5). Step 4: After the movable pipe (5) is adjusted to a suitable depth, the button (166) is manually pressed to drive the extraction device (4) to extract the gas inside the well (1).

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