A deep coal seam floor multi-functional roadway gas centralized extraction device and method

Abstract

The application provides a deep coal seam floor multifunctional roadway gas centralized extraction device and method, and relates to the technical field of gas utilization.The application comprises a first pipeline, a plurality of connecting pipes are fixedly connected and communicated with the first pipeline, a second pipeline is fixedly connected in the first pipeline, the second pipeline is provided with a plurality of through holes which are the same in number as the connecting pipes, an adjusting shell is fixedly connected in the connecting pipe, a sliding frame is slidingly connected with the adjusting shell, a first spring is fixedly connected between the sliding frame and the adjacent adjusting shell, a positioning shell is fixedly connected with the sliding frame, a connecting rod is fixedly connected with the positioning shell, and a sealing plate is fixedly connected with the connecting rod.After the total amount of gas in the branch pipe communicated with the connecting pipe is increased, the positioning shell drives the sealing plate to move to remove the sealing of the corresponding through hole on the second pipeline, so that the second pipeline extracts the gas in the connecting pipe through the through hole, thereby reducing the influence on the extraction rate of other connecting pipes.

Description

Technical Field

[0001] This invention relates to the field of gas utilization technology, and more specifically to a multifunctional gas extraction device and method for deep coal seam floor roadways. Background Technology

[0002] A centralized gas extraction device is a system that connects all extraction pipelines to centrally extract gas, aiming to reduce mine gas emissions, prevent gas accidents, and achieve resource utilization. These devices are typically installed on the surface or in underground roadways. In existing centralized gas extraction systems, when mining activities or geological changes cause an abnormal increase in gas concentration in a certain area, the extraction rate is usually increased by adjusting the valve opening of the corresponding extraction branch pipe or the negative pressure of the pump station to control the gas concentration within a safe range. However, this localized adjustment method has systemic defects: although increasing the extraction rate can accelerate the extraction of gas from the pipeline, since all extraction pipelines are connected to the same gas collection system, a sudden change in flow rate in a single path will disrupt the overall pressure balance of the system, causing changes in the pressure difference of other pipelines. This interference not only reduces the working efficiency of other extraction units but also causes the extraction rate of the target pipeline itself to deviate from the preset value due to system pressure feedback, posing risks of gas concentration control failure, energy waste, and even localized gas accumulation. Summary of the Invention

[0003] The purpose of this invention is to provide a multifunctional gas extraction device and method for deep coal seam floor roadways, in order to overcome or partially overcome the problems mentioned in the background.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A multifunctional gas extraction device for deep coal seam floor roadways includes a first pipe, which is fixedly connected to and communicates with a plurality of evenly distributed connecting pipes. A second pipe is fixedly connected inside the first pipe. The second pipe has the same number of through holes as the connecting pipes, and the positions of all through holes on the second pipe correspond one-to-one with the positions of adjacent connecting pipes. An adjusting shell is fixedly connected inside the connecting pipe. A sliding frame is slidably connected to the adjusting shell. A first spring is fixedly connected between the sliding frame and an adjacent adjusting shell. A positioning shell is fixedly connected to the side of the sliding frame near the first pipe. The positioning shell is located inside an adjacent connecting pipe. A connecting rod is fixedly connected to the side of the positioning shell near the first pipe. The connecting rod passes through an adjacent through hole on the second pipe. A sealing plate is fixedly connected to the end of the connecting rod away from the positioning shell. The sealing plate is used to seal the corresponding through hole on the second pipe.

[0005] To further explain, a first elastic plate evenly distributed circumferentially is fixed to the outer side of the sliding frame, and a second elastic plate evenly distributed circumferentially is fixed to the inner side of the sliding frame. Both the first and second elastic plates are in contact with the adjusting shell. An airbag is fixed to the sliding frame and is located between the circumferentially distributed first and second elastic plates. All the first and second elastic plates are used to limit the size of the airbag and control the area of ​​the airbag blocking the through holes on the adjacent adjusting shell.

[0006] To further explain, a shaping plate is fixedly connected between the first elastic plate and the adjacent second elastic plate. The shaping plate is used to limit the position of the airbag. The adjusting shell is slidably connected with guide plates of the same number as the shaping plates. The guide plates are used to limit the direction of deformation of the first elastic plate.

[0007] Further explanation: the connecting pipe is fixedly connected to and communicates with a U-shaped pipe. The U-shaped pipe is provided with an adjustment cavity and a sliding cavity. The adjustment cavity and the sliding cavity within the same U-shaped pipe are connected. The adjustment cavity and the sliding cavity are respectively located on both sides of the adjacent adjustment shell. The distance between the sliding cavity and the first pipe is less than the distance between the adjacent adjustment cavity and the first pipe. The U-shaped pipe is slidably connected to a piston rod. The piston rod is located in the adjacent adjustment cavity. The piston rod is fixedly connected to a limit frame. The limit frame moves within the adjacent sliding cavity. One end of the limit frame protrudes from the adjacent sliding cavity and restricts the position of the adjacent positioning shell.

[0008] To further explain, the cross-section of the positioning shell is stepped, and an inclined surface is provided between adjacent stepped surfaces within the same positioning shell.

[0009] To further explain, the U-shaped tube is slidably connected to an adjusting rod, and a second spring is fixedly connected between the adjusting rod and the adjacent piston rod. The U-shaped tube is rotatably connected to a threaded rod, which is threadedly connected to the adjacent adjusting rod. The threaded rod is used to adjust the position of the adjacent adjusting rod.

[0010] To further explain, two positioning rings are fixed inside the U-shaped tube, and both positioning rings are located inside the adjustment cavity. The positioning rings are used to limit the range of movement of the piston rod.

[0011] To further explain, multiple limiting rings are fixed inside the U-shaped tube, and all of the multiple limiting rings are located between two adjacent positioning rings. The limiting rings are used to increase the resistance to the movement of adjacent piston rods.

[0012] To further explain, the limiting frame is fixedly connected to a lifting frame, the lifting frame is slidably connected to the U-shaped tube, and a scale frame is fixedly connected to the U-shaped tube, the scale frame being used to display the position of the lifting frame.

[0013] A method for using a multi-functional gas centralized extraction device for deep coal seam floor roadways, based on the aforementioned multi-functional gas centralized extraction device for deep coal seam floor roadways, includes the following steps: S1: First connect the branch pipe to the corresponding connecting pipe, then connect the air pump to the first pipe, then start the air pump to extract the gas in the first and second pipes, so that the first and second pipes generate negative pressure, and the first pipe extracts the gas in the branch pipe through the connecting pipe. S2: During the process of gas flowing through the connecting pipe, due to the pressure difference on both sides of the regulating shell, the gas pushes the piston rod to move and compresses the second spring. The piston rod drives the limiting frame to move, so that the end of the limiting frame away from the piston rod moves to the area where the stepped surface in the middle of the positioning shell is located. S3: After the above-mentioned limiting frame moves upward under the influence of air pressure, the gas flowing through the regulating shell pushes the positioning shell to move and compresses the first spring. The first elastic plate and the second elastic plate drive the airbag to move, causing the airbag to deform and reduce the obstruction of the regulating shell through hole, thereby increasing the rate at which the gas passes through the regulating shell. S4: When the total amount of gas near the branch pipe increases, the pressure difference between the two sides of the regulating shell further increases, and the piston rod drives the limit frame to move upward again, so that the limit frame is in the range of the stepped surface of the positioning shell near the regulating shell. S5: After the aforementioned limit frame moves again, the gas pushes the positioning shell to move again, and the airbag deforms again to reduce the impact on the through hole of the regulating shell, so that the gas passes through the regulating shell at a higher rate. The positioning shell drives the sealing plate to move to release the seal on the corresponding through hole on the second pipe, so that the second pipe can also extract the gas in the branch pipe through the connecting pipe. S6: After the gas extraction near the branch pipe is completed, the pressure difference on both sides of the regulating shell decreases, the first spring pushes the positioning shell to move and reset, and the second spring pushes the piston rod to move and reset.

[0014] The beneficial technical effects of this invention are: 1. In this invention, after the total amount of gas in the branch pipe connected to the connecting pipe increases, the sealing plate is moved by the positioning shell to release the seal on the corresponding through hole on the second pipe, so that the second pipe can extract gas from the connecting pipe through the through hole, thereby reducing the impact on the extraction rate of other connecting pipes.

[0015] 2. During the process of the positioning shell approaching the first pipe, the shape of the airbag is adjusted by the first elastic plate and the second elastic plate, so that the area of ​​the airbag blocking the through hole on the adjusting shell is reduced, thereby further increasing the flow rate of gas in the connecting pipe and accelerating the flow of gas into the second pipe.

[0016] 3. The present invention fixes the position of the piston rod by multiple limiting rings, thereby increasing the stability of the position of the limiting frame. This allows the limiting frame to stably restrict the position of the positioning shell at different stages, ensuring that the shape of the airbag remains stable when the limiting frame and the positioning shell are in contact at different positions. This, in turn, ensures the stability of the flow area between the connecting pipe and the first pipe. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the first pipe, the connecting pipe, and the second pipe of the present invention; Figure 3 This is a three-dimensional structural diagram of the adjusting shell, connecting rod, and sealing plate of the present invention; Figure 4 This is a three-dimensional structural diagram of the adjusting shell, positioning shell, and U-shaped tube of the present invention; Figure 5 This is a three-dimensional structural diagram of the sliding frame, the first elastic plate, and the shaping plate of the present invention; Figure 6 This is a three-dimensional structural diagram of the second elastic plate, airbag, and guide plate of the present invention; Figure 7 This is a three-dimensional structural diagram of the limiting frame, adjusting rod, and scale frame of the present invention; Figure 8 This is a three-dimensional structural diagram of the piston rod, limiting bracket, and threaded rod of the present invention; Figure 9 This is a three-dimensional structural diagram of the threaded rod, positioning ring, and limiting ring of the present invention.

[0018] Reference numerals: 1-First pipe, 2-Connecting pipe, 3-Second pipe, 4-Adjusting shell, 5-Sliding frame, 6-First spring, 7-Positioning shell, 8-Connecting rod, 9-Sealing plate, 10-First elastic plate, 11-Second elastic plate, 12-Airbag, 13-Shaping plate, 14-Guide plate, 15-U-shaped tube, 1501-Adjusting cavity, 1502-Sliding cavity, 16-Piston rod, 17-Limiting frame, 18-Adjusting rod, 19-Second spring, 20-Threaded rod, 21-Positioning ring, 22-Limiting ring, 23-Lifting frame, 24-Scale frame. Detailed Implementation

[0019] First, it should be noted that in different described embodiments, the same components are given the same reference numerals or the same component names. The disclosure contained throughout this specification can be applied semantically to the same components having the same reference numerals or the same component names. Location descriptions selected in the specification, such as upper, lower, side, etc., also refer to the directly described and illustrated figures and are semantically applied to the new location when the location changes.

[0020] In the process of gas extraction by existing centralized gas extraction devices, when the gas concentration in a certain branch pipe rises abnormally, the extraction rate is usually increased by adjusting the valve opening of the corresponding extraction branch pipe in that area or the negative pressure of the pump station. However, since all extraction pipelines are connected to the same gas collection system, a sudden change in flow rate in a single path will disrupt the overall pressure balance of the system, causing changes in the pressure difference of other pipelines and affecting the normal extraction process of other pipelines.

[0021] Example 1: A multi-functional gas extraction device for deep coal seam floor roadways, such as Figures 1-6 As shown, the system includes a first pipe 1, which is fixedly connected to and connected to a plurality of evenly distributed connecting pipes 2. A second pipe 3 is fixedly connected inside the first pipe 1. The second pipe 3 has the same number of through holes as the connecting pipes 2, and the positions of all the through holes on the second pipe 3 correspond one-to-one with the positions of the adjacent connecting pipes 2. An adjusting shell 4 is fixedly connected inside the connecting pipe 2. A sliding frame 5 is slidably connected to the adjusting shell 4. A first spring 6 is fixedly connected between the sliding frame 5 and the adjacent adjusting shell 4. A positioning shell 7 is fixedly connected to the side of the sliding frame 5 closest to the first pipe 1. The positioning shell 7 is located inside the adjacent connecting pipe 2. A connecting rod 8 is fixedly connected to the side of the positioning shell 7 closest to the first pipe 1. The connecting rod 8 passes through the adjacent through hole on the second pipe 3. A sealing plate 9 is fixedly connected to the end of the connecting rod 8 away from the positioning shell 7. The sealing plate 9 is used to seal the corresponding through hole on the second pipe 3.

[0022] The above scheme provides a method to increase the gas extraction rate of only the branch pipe when the gas content near the branch pipe increases; in this paper, the position of the parts inside the connecting pipe 2 is based on Figure 3Referring to the shown positions, the first pipe 1 has a total of eight connecting pipes 2, with four connecting pipes 2 on one side. The eight connecting pipes 2 are arranged alternately on the left and right sides of the first pipe 1. The connecting pipes 2 are used to connect with branch pipes to extract gas from the branch pipes. An exhaust port is provided at the rear of the upper side of the first pipe 1. This exhaust port is connected to an external air pump, which is used to extract gas from the first pipe 1 and the second pipe 3. The second pipe 3 is coaxial with the first pipe 1, and the exhaust port of the second pipe 3 is located inside the exhaust port of the first pipe 1. The second pipe 3 is provided with eight through holes, and the through holes on the second pipe 3 are aligned with the adjacent connecting pipes 2. An adjustment shell 4 has a through hole in the middle for gas flow. The sliding frame 5 consists of a ring and two round rods, with the two round rods located on the right side of the ring. The first spring 6 is located between the ring of the sliding frame 5 and the adjacent adjustment shell 4. The first spring 6 is used to push the sliding frame 5 to move to the left and reset. The positioning shell 7 is located on the right side of the sliding frame 5. The projected area of ​​the positioning shell 7 on the plane of the adjacent regulating shell 4 is larger than the area of ​​the through hole on the regulating shell 4. This allows the gas passing through the regulating shell 4 to push the positioning shell 7 to the right. The positioning shell 7 has evenly distributed through holes to allow the gas to pass through. The positioning shell 7 reduces the area of ​​obstruction to the connecting pipe 2, ensuring that the gas can flow normally in the connecting pipe 2. The connecting rod 8 is located on the right side of the positioning shell 7, and the right end of the connecting rod 8 passes through the adjacent through hole on the connecting pipe 2. The sealing plate 9 is located on the right end of the adjacent connecting rod 8. Initially, the eight through holes on the second pipe 3 are blocked by the corresponding sealing plates 9, and the second pipe 3 cannot extract gas from the first pipe 1. The sealing plate 9 is stepped, and the projected area of ​​its left side on the plane of the adjacent regulating shell 4 is smaller than the projected area of ​​its right side on the plane of the adjacent regulating shell 4. A sealing ring is provided at this step to increase the sealing strength between the sealing plate 9 and the corresponding through hole on the connecting pipe 2.

[0023] Workflow: When it is necessary to extract gas from deep coal seams in a multi-functional roadway on the coal seam floor, the operator installs this device in the multi-functional roadway on the coal seam floor. Then, the operator connects the branch pipe to the connecting pipe 2, and then starts the air pump to extract gas from the first pipe 1. The gas enters the first pipe 1 through the connecting pipe 2. During this process, the thrust exerted by the gas flowing along the connecting pipe 2 on the positioning shell 7 is less than the leftward thrust of the first spring 6 on the sliding frame 5, so the positioning shell 7 does not move to the right. After the total amount of gas near the branch pipe increases, the flow rate of gas entering the branch pipe increases, the flow rate of gas entering the first pipe 1 through the connecting pipe 2 increases, and the rightward thrust of the gas on the positioning shell 7 increases. The rightward thrust of the housing 7 is greater than the leftward thrust of the first spring 6 on the sliding frame 5. The gas pushes the positioning housing 7 to move to the right. The positioning housing 7 drives the sealing plate 9 to move to the right through the connecting rod 8, so that the sealing plate 9 releases the seal on the adjacent through hole on the second pipe 3. This allows the second pipe 3 to additionally extract gas from the corresponding branch pipe of the connecting pipe 2 through the through hole, accelerating the extraction rate of gas in the branch pipe and reducing the amount of gas diffusing into the first pipe 1. This keeps the pressure in the first pipe 1 stable, thereby reducing the impact on the extraction rate of other branch pipes. During this process, the gas extraction rate of the air pump in the first pipe 1 and the second pipe 3 increases, and the rate at which the air pump increases is the same as the rate at which the second pipe 3 extracts gas from the connecting pipe 2.

[0024] Furthermore, such as Figures 3-6 As shown, a first elastic plate 10 is fixedly connected to the outer side of the sliding frame 5, and a second elastic plate 11 is fixedly connected to the inner side of the sliding frame 5, both of which are in contact with the adjusting shell 4. An airbag 12 is fixedly connected to the sliding frame 5, and the airbag 12 is located between the first elastic plate 10 and the second elastic plate 11. All the first elastic plates 10 and all the second elastic plates 11 are used to limit the size of the airbag 12 and control the area of ​​the airbag 12 that blocks the through holes on the adjacent adjusting shell 4.

[0025] Furthermore, such as Figures 3-6 As shown, a shaping plate 13 is fixedly connected between the first elastic plate 10 and the adjacent second elastic plate 11. The shaping plate 13 is used to limit the position of the airbag 12. The adjusting shell 4 is slidably connected with guide plates 14 of the same number as the shaping plates 13. The guide plates 14 are used to limit the direction of deformation of the first elastic plate 10.

[0026] The above solution provides a method for adjusting the flow area between the connecting pipe 2 and the first pipe 1. In this paper, a sliding frame 5 has eight circumferentially distributed first elastic plates 10, which are located at the outer diameter of the left side of the circular plate on the sliding frame 5. There are also eight second elastic plates 11, which are located at the inner diameter of the left side of the circular plate on the sliding frame 5. When the sliding frame 5 moves to the right, the sliding frame 5 drives the first elastic plates 10 and the second elastic plates 11 on it to move synchronously. During this process, the first elastic plates 10 and the second elastic plates 11 are deformed by the pressure of the adjacent adjusting shell 4. The airbag 12 is annular, and its minimum inner diameter is smaller than the inner diameter of the through hole on the adjusting shell 4. The airbag 12 is used to block the through hole on the adjusting shell 4 and control the flow area. The flow area of ​​the through hole on the regulating shell 4 is reduced. When the sliding frame 5 moves to the right, the first elastic plate 10 and the second elastic plate 11 both drive the airbag 12 to move to the right, causing the airbag 12 to deform and reduce the area of ​​obstruction of the through hole on the regulating shell 4, thereby accelerating the passage of gas through the regulating shell 4. The shaping plate 13 is used to limit the position of the inner side of the airbag 12, so that the position of the inner edge of the airbag 12 moves together with the deformation of the first elastic plate 10 and the second elastic plate 11. The guide plate 14 is used to control the first elastic plate 10 to support it, so that the innermost edge of the first elastic plate 10 moves radially, ensuring the stability of the first elastic plate 10 during the deformation process, thereby ensuring the shape stability of the airbag 12 and the obstruction effect of the airbag 12 on the through hole of the regulating shell 4.

[0027] Example 2: Based on Example 1, such as Figure 3 , Figure 4 and Figures 7-9 As shown, the connecting pipe 2 is fixedly connected to and connected to a U-shaped pipe 15. The U-shaped pipe 15 is provided with an adjustment cavity 1501 and a sliding cavity 1502. The adjustment cavity 1501 and the sliding cavity 1502 in the same U-shaped pipe 15 are connected. The adjustment cavity 1501 and the sliding cavity 1502 are located on both sides of the adjacent adjustment shell 4, and the distance between the sliding cavity 1502 and the first pipe 1 is less than the distance between the adjacent adjustment cavity 1501 and the first pipe 1. The U-shaped pipe 15 is slidably connected to a piston rod 16. The piston rod 16 is located in the adjacent adjustment cavity 1501. The piston rod 16 is fixedly connected to a limit frame 17. The limit frame 17 moves in the adjacent sliding cavity 1502. One end of the limit frame 17 protrudes out of the adjacent sliding cavity 1502 and restricts the position of the adjacent positioning shell 7.

[0028] Furthermore, such as Figures 3-6 As shown, the cross-section of the positioning shell 7 is stepped, and there are inclined surfaces between adjacent stepped surfaces within the same positioning shell 7.

[0029] Furthermore, such as Figure 3 , Figure 4 and Figures 7-9As shown, the U-shaped tube 15 is slidably connected to an adjusting rod 18. A second spring 19 is fixed between the adjusting rod 18 and the adjacent piston rod 16. The U-shaped tube 15 is rotatably connected to a threaded rod 20. The threaded rod 20 is threadedly connected to the adjacent adjusting rod 18. The threaded rod 20 is used to adjust the position of the adjacent adjusting rod 18.

[0030] The above scheme provides a way to limit the movement of the positioning shell 7, increase the positional stability of the positioning shell 7, and thus maintain the stability of the flow area of ​​the regulating shell 4. In this paper, the connecting pipe 2 is an L-shaped pipe, the U-shaped pipe 15 is located on the upper side of the horizontal part of the connecting pipe 2, the regulating cavity 1501 is a vertical cavity, the sliding cavity 1502 is an L-shaped cavity, the regulating cavity 1501 and the sliding cavity 1502 are located on the left and right sides of the U-shaped pipe 15 respectively, and the connection ports of the regulating cavity 1501 and the sliding cavity 1502 with the adjacent connecting pipe 2 are located on the left and right sides of the adjacent regulating shell 4 respectively. A rubber block is provided at the lower end of the piston rod 16. The rubber block of the piston rod 16 slides in a sealed manner with the U-shaped pipe 15. The rubber block divides the regulating cavity 1501 into upper and lower parts. The upper part of the regulating cavity 1501 is connected to the sliding cavity 1502. Since the left side of the regulating shell 4 is connected to the branch pipe and the right side of the regulating shell 4 is connected to the first pipe 1, during the gas extraction process, the gas pressure in the first pipe 1 is less than the gas pressure in the branch pipe. Therefore, when the gas is extracted through the connecting pipe 1501, the gas pressure in the first pipe 1 is less than the gas pressure in the branch pipe. When gas is extracted from the branch pipe by the connecting pipe 2, the piston rod 16 will move upward under the action of the gas pressure on the left and right sides of the adjusting shell 4. The limiting frame 17 is an L-shaped rod. The horizontal part of the limiting frame 17 is fixed to the upper part of the piston rod 16, and the vertical part of the limiting frame 17 is located in the sliding cavity 1502. The positioning shell 7 has three stepped surfaces, and the diameter of the three steps gradually decreases from left to right. The inclined surface of the positioning shell 7 is used to facilitate the switching of the limiting frame 17 between different stepped surfaces on the positioning shell 7. The limiting frame 17 is used to restrict the positioning shell 7 from moving to the right. The adjusting rod 18 is located above the piston rod 16. The second spring 19 is used to push the piston rod 16 to move downward and reset. Initially, the thread of the threaded rod 20 is located at the lower part of the threaded part on the adjusting rod 18. The threaded rod 20 is used to adjust the position of the adjacent adjusting rod 18, increase the resistance to the upward movement of the piston rod 16, and thus make the resistance to the upward movement of the piston rod 16 increase with the pressure difference between the gas pressure in the branch pipe and the gas pressure in the first pipe 1 at the initial stage.

[0031] Initially, the lower end of the limiting frame 17 contacts the stepped surface on the right side of the positioning shell 7, and the airbag 12 has the largest blocking area on the through hole of the adjusting shell 4. After the gas in the branch pipe is extracted, due to the pressure difference between the left and right sides of the adjusting shell 4, the adjusting chamber 1501 and the sliding chamber 1502 are located on the left and right sides of the adjusting shell 4, respectively. That is, there is a pressure difference between the upper and lower sides of the piston rod 16. At this time, the piston rod 16 moves upward under the action of air pressure and compresses the second spring 19. The piston rod 16 drives the limiting frame 17 to move upward to the height range corresponding to the stepped surface in the middle of the positioning shell 7, so that the lower end of the limiting frame 17 releases the limiting of the positioning shell 7. The positioning shell 7 moves to the right under the push of the airflow, changing the blocking area of ​​the airbag 12 on the through hole of the adjusting shell 4. Until the lower end of the limiting frame 17 contacts the stepped surface in the middle of the positioning shell 7, the positioning shell 7 stops moving to the right. After the gas in the connecting pipe 2 increases, the pressure difference between the left and right sides of the adjusting shell 4 further increases. Under the action of air pressure, the piston rod 16 moves upward again, causing the lower end of the limiting frame 17 to move to the height range where the stepped surface on the left side of the positioning shell 7 is located. This causes the positioning shell 7 to move to the right again, further reducing the area of ​​the airbag 12 blocking the through hole on the adjusting shell 4. As a result, the actual flow area of ​​the adjusting shell 4 changes with the pressure on both sides, accelerating the passage of gas through the adjusting shell 4. When the gas near the branch pipe is extracted, the pressure difference between the upper and lower sides of the piston rod 16 decreases, and the second spring 19 pushes the piston rod 16 downward to reset.

[0032] Furthermore, such as Figures 7-9 As shown, two positioning rings 21 are fixed inside the U-shaped tube 15. Both positioning rings 21 are located inside the adjustment cavity 1501. The positioning rings 21 are used to limit the range of movement of the piston rod 16.

[0033] Furthermore, such as Figures 7-9 As shown, multiple limiting rings 22 are fixed inside the U-shaped tube 15, and the multiple limiting rings 22 are all located between two adjacent positioning rings 21. The limiting rings 22 are used to increase the resistance to the movement of adjacent piston rods 16.

[0034] Furthermore, such as Figure 3 , Figure 4 and Figures 7-9 As shown, the limiting frame 17 is fixedly connected to the lifting frame 23, the lifting frame 23 is slidably connected to the U-shaped tube 15, and the scale frame 24 is fixedly connected to the U-shaped tube 15. The scale frame 24 is used to display the position of the lifting frame 23.

[0035] The above solution provides a way to increase the positional stability of the limiting frame 17; the U-shaped tube 15 has two positioning rings 21, one upper and one lower, and the rubber block of the piston rod 16 is located between the two adjacent positioning rings 21. The rubber block of the piston rod 16 is provided with two annular inclined surfaces, and the opposing sides of the two positioning rings 21 are also provided with annular inclined surfaces to increase the adhesion strength between the positioning rings 21 and the rubber blocks on the adjacent piston rods 16. Initially, the rubber block of the piston rod 16 is in contact with the lower positioning ring 21. When extracting gas, the adjusting chamber... The pressure of the gas in cavity 1501 is greater than the pressure of the gas in sliding cavity 1502, and the piston rod 16 moves upward under the push of the gas. In this paper, a positioning shell 7 has three stepped surfaces (left, middle, and right), and a U-shaped tube 15 has four limiting rings 22 distributed axially in the upper and lower directions. The number of stepped surfaces on the positioning shell 7 and the number of limiting rings 22 in the U-shaped tube 15 can be adjusted according to the actual situation, and all four limiting rings 22 are located between two adjacent limiting rings 22. The second spring 19 exerts a minimum force on the piston rod 16. The thrust is greater than the resistance of the limiting ring 22 to the piston rod 16. The limiting ring 22 is used to increase the resistance to the movement of the piston rod 16. The lower limiting ring 22 and the lower positioning ring 21 are used to restrict the position of the piston rod 16 when the limiting frame 17 contacts the stepped surface on the right side of the positioning shell 7. The two middle limiting rings 22 are used to restrict the position of the piston rod 16 when the limiting frame 17 contacts the stepped surface in the middle of the positioning shell 7. The upper limiting ring 22 and the upper positioning ring 21 are used to restrict the position of the piston rod 16 when the limiting frame 17 contacts the stepped surface on the left side of the positioning shell 7. The position of piston rod 16 is restricted, thereby reducing the amplitude of piston rod 16 moving up and down due to pressure changes on both sides of the adjusting shell 4 when it is in the above position, thus increasing the stability of the relative position between the limiting frame 17 and the corresponding stepped surface on the positioning shell 7; the lifting frame 23 is located above the limiting frame 17, and two scale frames 24 are provided on the U-shaped tube 15. The scale frames 24 are used to display the position of the lifting frame 23, so that the staff can more intuitively determine which branch pipe has a gas pressure change and make subsequent adjustments.

[0036] Example 3: Based on Example 2, combined with Figures 1-9 As shown, a method for using a multi-functional gas extraction device for deep coal seam floor roadways includes the following steps: S1: First connect the branch pipe to the corresponding connecting pipe 2, then connect the air pump to the first pipe 1, and then start the air pump to extract the gas in the first pipe 1 and the second pipe 3, so that the first pipe 1 and the second pipe 3 generate negative pressure, and the first pipe 1 extracts the gas in the branch pipe through the connecting pipe 2. S2: During the process of gas flowing through the connecting pipe 2, due to the pressure difference between the two sides of the regulating shell 4, the gas pushes the piston rod 16 to move and compresses the second spring 19. The piston rod 16 drives the limiting frame 17 to move, so that the end of the limiting frame 17 away from the piston rod 16 moves to the area where the stepped surface in the middle of the positioning shell 7 is located. S3: After the limiting frame 17 moves upward under the influence of air pressure, the gas flowing through the regulating shell 4 pushes the positioning shell 7 to move and compresses the first spring 6. The first elastic plate 10 and the second elastic plate 11 drive the airbag 12 to move, so that the airbag 12 deforms and reduces the obstruction of the through hole of the regulating shell 4, increasing the rate at which the gas passes through the regulating shell 4. S4: When the total amount of gas near the branch pipe increases, the pressure difference between the two sides of the regulating shell 4 further increases, and the piston rod 16 drives the limit frame 17 to move upward again, so that the limit frame 17 is in the range of the stepped surface of the positioning shell 7 near the regulating shell 4. S5: After the aforementioned limit frame 17 moves again, the gas pushes the positioning shell 7 to move again, and the airbag 12 deforms again to reduce the influence on the through hole of the regulating shell 4, so that the gas passes through the regulating shell 4 at a faster rate. The positioning shell 7 drives the sealing plate 9 to move to release the seal on the corresponding through hole on the second pipe 3, so that the second pipe 3 also extracts the gas in the branch pipe through the connecting pipe 2. S6: After the gas extraction near the branch pipe is completed, the pressure difference on both sides of the regulating shell 4 decreases, the first spring 6 pushes the positioning shell 7 to move and reset, and the second spring 19 pushes the piston rod 16 to move and reset.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-functional gas extraction device for deep coal seam floor roadways, characterized in that, The device includes a first pipe, which is fixedly connected to and communicates with a plurality of evenly distributed connecting pipes. A second pipe is fixedly connected inside the first pipe. The second pipe has the same number of through holes as the connecting pipes, and the positions of all the through holes on the second pipe correspond one-to-one with the positions of the adjacent connecting pipes. An adjusting shell is fixedly connected inside the connecting pipe. A sliding frame is slidably connected to the adjusting shell. A first spring is fixedly connected between the sliding frame and the adjacent adjusting shell. A positioning shell is fixedly connected to the side of the sliding frame near the first pipe. The positioning shell is located inside the adjacent connecting pipe. A connecting rod is fixedly connected to the side of the positioning shell near the first pipe. The connecting rod passes through the adjacent through hole on the second pipe. A sealing plate is fixedly connected to the end of the connecting rod away from the positioning shell. The sealing plate is used to seal the corresponding through hole on the second pipe. The outer side of the sliding frame is fixed with a first elastic plate that is evenly distributed circumferentially, and the inner side of the sliding frame is fixed with a second elastic plate that is evenly distributed circumferentially. Both the first elastic plate and the second elastic plate are in contact with the adjusting shell. An airbag is fixed to the sliding frame. The airbag is located between the first elastic plate and the second elastic plate that are evenly distributed circumferentially. All the first elastic plates and all the second elastic plates are used to limit the size of the airbag and control the area of ​​the airbag that blocks the through holes on the adjacent adjusting shell. A shaping plate is fixedly connected between the first elastic plate and the adjacent second elastic plate. The shaping plate is used to limit the position of the airbag. The adjusting shell is slidably connected with guide plates of the same number as the shaping plates. The guide plates are used to limit the direction of deformation of the first elastic plate.

2. The multi-functional gas extraction device for deep coal seam floor as described in claim 1, characterized in that, The connecting pipe is fixedly connected to and communicates with a U-shaped pipe. The U-shaped pipe is provided with an adjustment cavity and a sliding cavity. The adjustment cavity and the sliding cavity within the same U-shaped pipe are connected. The adjustment cavity and the sliding cavity are located on opposite sides of the adjacent adjustment shells, and the distance between the sliding cavity and the first pipe is less than the distance between the adjacent adjustment cavity and the first pipe. The U-shaped pipe is slidably connected to a piston rod. The piston rod is located in the adjacent adjustment cavity. The piston rod is fixedly connected to a limit frame. The limit frame moves within the adjacent sliding cavity. One end of the limit frame protrudes from the adjacent sliding cavity and restricts the position of the adjacent positioning shell.

3. The multi-functional gas extraction device for deep coal seam floor as described in claim 2, characterized in that, The positioning shell has a stepped cross-section, and an inclined surface is provided between adjacent stepped surfaces within the same positioning shell.

4. A multi-functional gas extraction device for deep coal seam floor as described in claim 3, characterized in that, The U-shaped tube is slidably connected to an adjusting rod, and a second spring is fixedly connected between the adjusting rod and the adjacent piston rod. The U-shaped tube is rotatably connected to a threaded rod, which is threadedly connected to the adjacent adjusting rod. The threaded rod is used to adjust the position of the adjacent adjusting rod.

5. A multi-functional gas extraction device for deep coal seam floor as described in claim 4, characterized in that, Two positioning rings are fixed inside the U-shaped tube, and both positioning rings are located inside the adjustment cavity. The positioning rings are used to limit the range of movement of the piston rod.

6. A multi-functional gas extraction device for deep coal seam floor as described in claim 5, characterized in that, Multiple limiting rings are fixed inside the U-shaped tube, and the multiple limiting rings are all located between two adjacent positioning rings. The limiting rings are used to increase the resistance to the movement of adjacent piston rods.

7. A multi-functional gas extraction device for deep coal seam floor as described in claim 6, characterized in that, The limiting frame is fixedly connected to the lifting frame, the lifting frame is slidably connected to the U-shaped tube, and a scale frame is fixedly connected to the U-shaped tube to display the position of the lifting frame.

8. A method for using a multi-functional gas centralized extraction device for deep coal seam floor roadways, characterized in that, The multi-functional gas extraction device for deep coal seam floor as described in claim 7 is used as follows: S1: First connect the branch pipe to the corresponding connecting pipe, then connect the air pump to the first pipe, then start the air pump to extract the gas in the first and second pipes, so that the first and second pipes generate negative pressure, and the first pipe extracts the gas in the branch pipe through the connecting pipe. S2: During the process of gas flowing through the connecting pipe, due to the pressure difference on both sides of the regulating shell, the gas pushes the piston rod to move and compresses the second spring. The piston rod drives the limiting frame to move, so that the end of the limiting frame away from the piston rod moves to the area where the stepped surface in the middle of the positioning shell is located. S3: After the above-mentioned limiting frame moves upward under the influence of air pressure, the gas flowing through the regulating shell pushes the positioning shell to move and compresses the first spring. The first elastic plate and the second elastic plate drive the airbag to move, causing the airbag to deform and reduce the obstruction of the regulating shell through hole, thereby increasing the rate at which the gas passes through the regulating shell. S4: When the total amount of gas near the branch pipe increases, the pressure difference between the two sides of the regulating shell further increases, and the piston rod drives the limit frame to move upward again, so that the limit frame is in the range of the stepped surface of the positioning shell near the regulating shell. S5: After the aforementioned limit frame moves again, the gas pushes the positioning shell to move again, and the airbag deforms again to reduce the impact on the through hole of the regulating shell, so that the gas passes through the regulating shell at a higher rate. The positioning shell drives the sealing plate to move to release the seal on the corresponding through hole on the second pipe, so that the second pipe can also extract the gas in the branch pipe through the connecting pipe. S6: After the gas extraction near the branch pipe is completed, the pressure difference on both sides of the regulating shell decreases, the first spring pushes the positioning shell to move and reset, and the second spring pushes the piston rod to move and reset.

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