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

Abstract

The invention discloses a low-permeability coal seam gas efficient extraction device and extraction method, and relates to the technical field of gas extraction, the low-permeability coal seam gas efficient extraction device comprises a drilling well and further comprises an adjusting device, a sealing plate is fixedly installed on the inner wall of the drilling well, an extraction pipeline fixedly penetrates through the upper wall and the lower wall of the sealing plate, and extraction equipment is arranged at the top of the extraction pipeline; a moving pipe is slidably mounted on the inner wall of the extraction equipment, the adjusting device comprises an adjusting groove, a U-shaped frame, an adjusting rod, a moving ring, an adjusting hole, a placing groove, a cambered surface block, a cambered surface plate and a linkage plate, the moving pipe moves downwards to drive the moving ring to move downwards, and the moving ring moves downwards to scrape the inner wall of a drilling well so as to damage a microscopic coal seam structure of the inner wall of the drilling well. By scratching the coal seam surfaces with different depths, the microstructure of the coal seam can be destroyed, cracks of the coal seam are increased, and therefore the gas extraction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas extraction, and in particular to a low-permeability coal seam gas efficient extraction device and extraction method. Background Art

[0002] The efficient extraction device of low-permeability coal seam gas usually consists of extraction equipment, control equipment, detection equipment and protective equipment. Most of the coal seam gas storage areas belong to low-permeability coal seams, which makes it difficult to implement coal seam gas pre-extraction and the effect is very poor. Therefore, researchers have studied the low-permeability coal seam gas extraction technology. The basic starting point of the research is to improve the permeability of the coal seam or increase the unit coal body drilling length to achieve the purpose of increasing the extraction rate. Among them, in the measure of increasing the unit coal body drilling length, it is easy for part of the gas stored in the coal seam to overflow into the atmosphere, which not only seriously affects the living environment of human beings, but also wastes a lot of non-renewable energy. Therefore, how to improve the permeability of the coal seam by cracking the rock strata inside the mine has become an important research direction for researchers.

[0003] The patent with the patent announcement number CN219754510U relates to a low-permeability coal seam gas efficient extraction device, which includes: a gas extraction mechanism; an outer protective tube, the top of which is fixedly mounted on the bottom surface of the gas extraction mechanism, and the bottom of which extends into the borehole, the top fixed sleeve of the outer protective tube is provided with an outer support ring, the outer wall of which is in close contact with the inner wall of the borehole; a pumping pipe, which is arranged in the outer protective tube, and the top of which is fixedly connected to the gas extraction end of the gas extraction mechanism. The patent has a rock formation cracking assembly installed at the bottom of the outer protective tube, wherein when the electric cylinder is in a retracted state, the spring is compressed and deformed by pressure, and when the electric cylinder is instantly extended, it quickly pushes the impact plate outward, and at the same time, under the tension of the spring, the outward thrust of the impact plate is enhanced, thereby impacting the surrounding rock formations, so that cracks are generated in the rock formations, and the gas permeability of the rock formations is improved, thereby improving the gas extraction efficiency.

[0004] In the above patent, a rock cracking assembly is installed at the bottom of the outer protective tube, wherein when the electric cylinder is in a retracted state, the spring is compressed and deformed by the pressure, and when the electric cylinder is instantly extended, it pushes the impact plate outward rapidly. At the same time, under the action of the tension of the spring, the outward thrust of the impact plate is enhanced, thereby impacting the surrounding rock formations, causing gaps in the rock formations, improving the gas permeability of the rock formations, and thus improving the gas extraction efficiency. However, it is difficult to scrape and push coal seams of different depths. If it is impossible to scrape coal seams of different depths, it will cause the gas to be difficult to release smoothly, affecting the extraction effect, thereby reducing the amount of gas released. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a low-permeability coal seam gas efficient extraction device and extraction method, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a low-permeability coal seam gas efficient extraction device, including a drilling well, and also including an adjusting device, wherein a sealing plate is fixedly installed on the inner wall of the drilling well, and an extraction pipeline is fixedly penetrated through the upper and lower walls of the sealing plate, and an extraction device is arranged on the top of the extraction pipeline, and a moving pipe is slidably installed on the inner wall of the extraction equipment, wherein the adjusting device includes an adjusting groove, a U-shaped frame, an adjusting rod, a moving ring, an adjusting hole, a placement groove, an arc surface block, an arc surface plate and a linkage plate, and the moving pipe moves downward to drive the moving ring to move downward, and the moving ring moves The downward movement scrapes the inner wall of the borehole, thereby destroying the microscopic coal seam structure of the inner wall of the borehole, the adjusting groove is arranged on the circumferential surface of the moving tube, the U-shaped frame is fixedly installed on the circumferential surface of the extraction pipe, the adjusting 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 tube, the adjusting hole is arranged on the circumferential surface of the extraction pipe, the placing groove is arranged on the circumferential surface of the moving pipe, the arc surface block is fixedly installed on the inner wall of the placing groove, the arc panel is fixedly installed on the circumferential surface of the extraction pipe, and a button is fixedly installed on the top of the extraction equipment, and the button is electrically connected to the extraction equipment.

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

[0008] According to the above technical solution, the adjustment rod contacts the inner wall of the adjustment groove, the arc panel is elastic, and a No. 1 rubber ring is provided between the extraction pipe and the movable pipe, and the No. 1 rubber ring can increase the sealing between the extraction pipe and the movable pipe.

[0009] According to the above technical scheme, a sealing device for preventing gas leakage is provided on the circumferential surface of the drilling 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 tube and the extraction pipeline. The support groove is opened on the circumferential surface of the drilling 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 in contact with the extraction pipeline is made of rubber material.

[0010] According to the above technical solution, the L-shaped plate is in contact with the linkage plate, and a No. 2 spring is arranged between the support plate and the L-shaped plate. The No. 2 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 limit plate, a limit rod and a protective groove. The limit rod moves to contact the inner wall of the protective groove and limit the button. The button cannot be pressed due to the limitation of the limit rod. 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 limit plate is slidably installed on the inner wall of the U-shaped tube, the limit rod is fixedly installed on the left side of the limit plate, and the protective groove is opened on the circumferential surface of the button.

[0012] According to the above technical solution, liquid is arranged inside the U-shaped tube, a No. 3 spring is arranged 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 No. 2 rubber ring is arranged between the detection rod and the U-shaped tube, and the No. 2 rubber ring can increase the sealing between the detection rod and the U-shaped tube. A No. 3 rubber ring is arranged between the limit plate and the U-shaped tube, and the No. 3 rubber ring can increase the sealing between the limit plate and the U-shaped tube. The detection rod is in contact with the load-bearing rod.

[0014] 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 includes the following steps: Step 1: When the depth of gas extraction needs to be adjusted, first manually pull the linkage plate to move away from the extraction pipeline. The linkage plate moves away from the extraction pipeline to drive the adjustment rod to move; Step 2: The adjusting rod moves away from the extraction pipe to break away from the adjusting slot and release the limit on the moving pipe. After the limit on the moving pipe is released, the moving pipe is manually pushed downward to adjust the depth. Step 3: When the moving tube moves to a suitable depth, the linkage plate is released so that the linkage plate moves toward the extraction pipe under the elastic force of the No. 1 spring. The linkage plate moves toward the extraction pipe to drive the adjusting rod to move. The adjusting rod moves to contact the inner wall of the adjusting groove and restores the limit position of the moving tube. Step 4: After the mobile pipe is adjusted to the appropriate depth, manually press the button to drive the extraction equipment to extract the gas inside the well.

[0015] The present invention provides a low-permeability coal seam gas efficient extraction device, which has the following beneficial effects: (1) In the present invention, the depth of the gas extraction device is adjusted by manually pushing the moving tube downward after the limit of the moving tube is released. The length of the pipe can be adjusted according to the actual situation on site, thereby ensuring that the extraction device is always kept in the best working state. The moving tube moves downward to drive the moving ring downward. The moving ring moves downward to scrape the inner wall of the well, thereby destroying the microscopic coal seam structure of the inner wall of the well. 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. The vibration of the arc block drives the vibration of the moving tube, and the vibration of the moving tube 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.

[0016] (2) The invention drives the sealing frame to move by resetting the L-shaped plate toward the U-shaped frame. The sealing frame moves to contact the adjustment hole and seals the connection between the moving tube and the extraction pipe. The extraction efficiency can be maximized by improving the airtightness of the gas fluid when it flows in the extraction pipe, thereby ensuring that more gas is extracted. The movement of the sealing frame drives the bearing rod to move. The bearing rod moves and supports the sealing frame together with the bearing groove, thereby ensuring the sealing effect of the sealing frame. The cooperation of the bearing rod and the bearing groove can ensure that the sealing frame is always in the correct position and stress state, thereby effectively avoiding displacement of the sealing frame and further ensuring the long-term stability of the sealing effect.

[0017] (3) In the present invention, the limit plate is squeezed by the liquid inside the U-shaped tube and moves toward the button. The limit plate moves toward the button and drives the limit rod to move. The limit rod moves and contacts the inner wall of the protective groove and limits the button. The button cannot be pressed due to the limit of the limit rod. The button is limited by the limit rod to ensure that the extraction equipment can only be started after the adjustment of the moving tube is completed, thereby avoiding the normal gas extraction process being disrupted by accidentally touching the button due to external force, and further ensuring the stability and effectiveness of the gas extraction operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the drilling well of the present invention; Figure 3 For the present invention Figure 2 A schematic diagram of the structure enlargement of part A; Figure 4 This is a schematic diagram of the position structure of the extraction pipeline and the extraction equipment of the present invention; Figure 5 For the present invention Figure 4 A schematic diagram of the structure of part B in the middle is enlarged; Figure 6 This is a schematic diagram of the position structure of the support rod and the L-shaped plate of the present invention; Figure 7 It is a schematic diagram of the internal structure of the U-shaped tube of the present invention.

[0019] In the figure: 1, drilling; 2, sealing plate; 3, extraction pipeline; 4, extraction equipment; 5, moving pipe; 6, adjusting groove; 7, U-shaped frame; 8, adjusting rod; 9, moving ring; 10, adjusting hole; 11, placement groove; 12, arc surface 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, limit plate; 165, limit rod; 166, button; 167, protection groove. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-Figure 6 One embodiment of the present invention is: a low-permeability coal seam gas efficient extraction device, including a drilling well 1, and also including an adjusting device, wherein a sealing plate 2 is fixedly installed on the inner wall of the drilling well 1, and an extraction pipeline 3 is fixedly penetrated through the upper and lower walls of the sealing plate 2, and an extraction device 4 is arranged on the top of the extraction pipeline 3, and a moving pipe 5 is slidably installed on the inner wall of the extraction device 4, wherein the adjusting device includes 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 surface plate 13 and a linkage plate 14, wherein the adjusting groove 6 is provided on the circumferential surface of the moving pipe 5, the U-shaped frame 7 is fixedly installed on the circumferential surface of the extraction pipeline 3, and the adjusting rod 8 slides through the U-shaped frame 7 The outer wall, the movable ring 9 is fixedly passed through the inner and outer walls of the movable tube 5, the adjusting 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 movable tube 5, the arc block 12 is fixedly installed on the inner wall of the placement groove 11, and the arc panel 13 is fixedly installed on the circumferential surface of the extraction pipe 3. A button 166 is fixedly installed on the top of the extraction equipment 4. The button 166 is electrically connected to the extraction equipment 4 and can be adjusted according to the actual situation on site through an adjustable length pipe, so as to ensure that the extraction equipment 4 is always kept in the best working state. 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.

[0022] A No. 1 spring is arranged between the linkage plate 14 and the U-shaped frame 7 , and the No. 1 spring can drive the linkage plate 14 to reset, the arc surface block 12 contacts the arc surface plate 13 , and the moving ring 9 contacts the inner wall of the drilling well 1 .

[0023] 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 arranged between the extraction pipe 3 and the moving pipe 5, through which the sealing between the extraction pipe 3 and the moving pipe 5 can be increased.

[0024] 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 includes the following steps: Step 1: When the depth of gas extraction needs to be adjusted, first manually pull the linkage plate 14 to move away from the extraction pipeline 3, and the linkage plate 14 moves away from the extraction pipeline 3 to drive 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 moving pipe 5. After the limit on the moving pipe 5 is released, the moving pipe 5 is manually pushed downward to adjust the depth; Step 3: When the mobile tube 5 moves to a suitable depth, the linkage plate 14 is released so that the linkage plate 14 moves toward the direction close to the extraction pipe 3 under the elastic force of the first spring. The linkage plate 14 moves toward the direction close to 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 mobile 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 equipment 4 to extract the gas inside the well 1 .

[0025] When this embodiment is working: when it is necessary to adjust the depth of gas extraction, first manually pull the linkage plate 14 to move in the direction away from the extraction pipe 3. The linkage plate 14 moves in the direction away from the extraction pipe 3 to pull the No. 1 spring. The No. 1 spring is deformed by the pulling of the linkage plate 14. At the same time, the linkage plate 14 moves in the direction away from the extraction pipe 3 to drive the adjustment rod 8 to move. The adjustment rod 8 moves in the direction away from the extraction pipe 3 to break away from the contact with the adjustment groove 6 and releases the limit on the mobile tube 5. After the limit of the mobile tube 5 is released, the mobile tube 5 is manually pushed downward by a tool matching the size of the adjustment groove 6 to adjust the depth. When the mobile tube 5 moves to a suitable depth, the linkage plate 14 is released so that the linkage plate 14 moves close to the extraction pipe under the elastic force of the No. 1 spring. 3, the linkage plate 14 moves in the direction close to the extraction pipeline 3, driving the adjusting rod 8 to move, the adjusting rod 8 moves to contact the inner wall of the adjusting groove 6 and restores the limit of the movable tube 5. When the movable tube 5 is manually pushed to move downward, the movable tube 5 moves downward and drives the movable ring 9 to move downward. The movable ring 9 moves downward to scrape the inner wall of the borehole 1, thereby destroying the microscopic coal seam structure of the inner wall of the borehole 1. At the same time, the movable tube 5 moves downward and drives the arc surface block 12 to move downward. The arc surface block 12 moves downward and contacts and rubs with the arc surface plate 13 to generate vibration. The vibration of the arc surface block 12 drives the movable tube 5 to vibrate, and the vibration of the movable tube 5 drives the movable ring 9 to resonate together. After the movable tube 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 borehole 1.

[0026] See also Figure 1-Figure 7 On the basis of the above embodiment, in another embodiment of the present invention, a sealing device for preventing gas leakage is provided on the circumferential surface of the drilling well 1, a detection device is provided on the right side of the U-shaped frame 7, 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 provided 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, and the L-shaped plate 154 is fixedly mounted on 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, the load-bearing rod 157 is fixedly installed on the front side of the sealing frame 155, the sealing frame 155 contacts the inner wall of the adjusting hole 10, and the side of the sealing frame 155 in contact with the extraction pipe 3 is made of rubber material. By improving the airtightness of the gas fluid when flowing 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 stress state.

[0027] The L-shaped plate 154 is in contact with the linkage plate 14, and a No. 2 spring is arranged between the support plate 152 and the L-shaped plate 154. The No. 2 spring can drive the L-shaped plate 154 to reset, and the load-bearing rod 157 is in contact with the inner wall of the load-bearing groove 156. There are two groups of load-bearing grooves 156 and load-bearing rods 157, and in the other group, the load-bearing groove 156 is opened on the rear side of the U-shaped frame 7, and the load-bearing rod 157 is fixedly installed on the rear side of the sealing frame 155.

[0028] The detection device includes 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 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 limit plate 164 is slidably installed on the inner wall of the U-shaped tube 161, the limit rod 165 is fixedly installed on the left side of the limit plate 164, and the protective groove 167 is opened on the circumferential surface of the button 166. The button 166 is limited by the limit rod 165 to ensure that the extraction equipment 4 can only be started after the adjustment of the moving tube 5 is completed, thereby avoiding the normal gas extraction process being disrupted due to accidental touching of the button 166 by external force, and further ensuring the stability and effectiveness of the gas extraction operation.

[0029] Liquid is arranged inside the U-shaped tube 161 , and a No. 3 spring is arranged 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 .

[0030] A No. 2 rubber ring is arranged between the detection rod 163 and the U-shaped tube 161, and the No. 2 rubber ring can increase the sealing between the detection rod 163 and the U-shaped tube 161. A No. 3 rubber ring is arranged between the limit plate 164 and the U-shaped tube 161, and the No. 3 rubber ring can increase the sealing between the limit plate 164 and the U-shaped tube 161. The detection rod 163 is in contact with the load-bearing rod 157.

[0031] When this embodiment is working: the linkage plate 14 is manually pulled to move in the direction away from the extraction pipeline 3, the linkage plate 14 moves in the direction away from the extraction pipeline 3 and contacts with the L-shaped plate 154 and squeezes the L-shaped plate 154, the L-shaped plate 154 is squeezed by the linkage plate 14 and moves in the direction away from the U-shaped frame 7, the L-shaped plate 154 moves in the direction away from the U-shaped frame 7 to pull the No. 2 spring, the No. 2 spring is pulled by the L-shaped plate 154 to deform and accumulate force, and at the same time the L-shaped plate 154 moves in the direction away from the U-shaped frame 7 to drive the sealing frame 155 to move, the sealing frame 155 moves in the direction away from the U-shaped frame 7 to break away from the contact with the adjusting hole 10 and the moving tube 5, thereby facilitating the depth adjustment of the moving tube 5, and the linkage plate 14 is pressed against the No. 1 spring When it moves and resets in the direction close to the extraction pipe 3 under the action of the elastic force, the linkage plate 14 moves and resets in the direction close to the extraction pipe 3 and breaks away from the contact with the L-shaped plate 154. After the L-shaped plate 154 breaks away from the contact with the linkage plate 14, the L-shaped plate 154 moves and resets in the direction close to the U-shaped frame 7 under the action of the elastic force of the No. 2 spring. The L-shaped plate 154 moves and resets in the direction close to the U-shaped frame 7, driving the sealing frame 155 to move. The sealing frame 155 moves and contacts with the adjusting hole 10 to seal the connection between the moving tube 5 and the extraction pipe 3. At the same time, the sealing frame 155 moves and drives the load-bearing rod 157 to move. The load-bearing rod 157 moves and cooperates with the load-bearing groove 156 to support the sealing frame 155, thereby ensuring the sealing effect of the sealing frame 155.

[0032] The sealing frame 155 moves in a direction away from the U-shaped frame 7, driving the load-bearing rod 157 to move. The load-bearing rod 157 moves to contact with the detection rod 163 and squeezes the detection rod 163. The detection rod 163 is squeezed by the load-bearing rod 157 and moves in a direction away from the extraction pipe 3. The detection rod 163 moves in a direction away from the extraction pipe 3 and drives the detection plate 162 to move. The detection plate 162 moves to squeeze the No. 3 spring. The No. 3 spring is pulled by the detection plate 162 to deform and accumulate force. At the same time, the detection plate 162 moves in a direction away from the extraction pipe 3 to squeeze the liquid inside the U-shaped tube 161. The liquid inside the U-shaped tube 161 is squeezed by the detection plate 162 and moves toward the direction close to the limit plate 164. The liquid inside the U-shaped tube 161 moves toward the direction close to the limit plate 164 to squeeze the limit plate 164. The limit plate 164 is squeezed by the liquid inside the U-shaped tube 161 and moves toward the direction close to the button 166. The limit plate 164 moves toward the direction close to the button 166 and drives the limit rod 165 to move. The limit rod 165 moves and contacts the inner wall of the protective groove 167 and limits the button 166. The button 166 is limited by the limit rod 165 and cannot be pressed.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for efficiently extracting gas from a low-permeability coal seam, 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 by: 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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