Efficient coal bed gas fracturing pulverized coal prevention device

Abstract

The invention relates to the technical field of coal bed gas fracturing exploitation, in particular to an efficient coal bed gas fracturing pulverized coal prevention device. According to the technical scheme, the device comprises a connecting pipeline assembly, an ultrasonic generator is arranged on one side of the connecting pipeline assembly, the connecting pipeline assembly comprises a built-in connecting pipe, and an external connecting pipe is connected to the outer side of the built-in connecting pipe in an inserted mode. The ultrasonic generator is activated to generate high-frequency vibration, gas in fracturing fluid forms numerous stable tiny bubbles, and when the fracturing fluid carrying the tiny bubbles makes contact with an underground coal seam along a conveying pipeline, the bubbles are rapidly attached to the surface of loose coal powder and lifted to the top area by means of buoyancy, and sedimentation and mixing into a main flow passage are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of coalbed methane fracturing and mining, and in particular to a high-efficiency coalbed methane fracturing and coal powder prevention device. Background Art

[0002] At present, in the process of coalbed methane fracturing, there is a widespread phenomenon of large amounts of coal dust being produced, which not only seriously affects the mining efficiency, but also brings great safety hazards. Existing treatment measures are mostly concentrated in the post-processing stage, and there is a lack of effective source control technology, so that coal dust still has an adverse impact on production and the environment.

[0003] At present, several common technical means include: 1. Using traditional hydraulic fracturing to dilute the coal powder concentration by increasing the volume of fracturing fluid. Although this method can reduce the impact of coal powder to a certain extent, it will increase water resource consumption and the difficulty of subsequent treatment; 2. Using physical isolation nets or filter devices placed in the wellbore to intercept larger particles of coal powder, but this approach has limited blocking effect on fine coal powder, and long-term operation will cause blockage and require frequent cleaning; 3. Applying chemical flocculants to promote coal powder agglomeration and precipitation, but the use of chemical reagents may cause new environmental pollution problems and is costly. These three methods attempt to alleviate the coal powder problem from different angles, but each has obvious limitations.

[0004] In general, traditional methods focus more on post-processing or simply preventing coal dust from spreading. They lack active prevention mechanisms and cannot fundamentally solve the problem, resulting in low operating efficiency, serious environmental pollution, and difficulty in ensuring the safety of operators.

[0005] Therefore, the present application proposes an efficient coalbed methane fracturing and coal powder prevention device. Summary of the invention

[0006] The purpose of the present invention is to propose an efficient coalbed methane fracturing coal powder prevention device to address the problems that traditional methods in the background technology mostly focus on post-processing or simply preventing coal powder from spreading, lack of active prevention mechanism, resulting in low operating efficiency and serious environmental pollution.

[0007] The technical solution of the present invention is as follows: a high-efficiency coalbed methane fracturing and coal powder prevention device comprises a connecting pipe assembly, one side of which is provided with an ultrasonic generator, the connecting pipe assembly comprises a built-in connecting pipe, and the outer side of the built-in connecting pipe is plugged with an external connecting pipe; A detachable filter assembly is installed inside the connecting pipe assembly, the detachable filter assembly includes a microbubble injection system, and the ultrasonic generator is electrically connected to the microbubble injection system; A first positioning filter component and an auxiliary adjustment component with an automatic cleaning function are installed inside the connecting pipe component. An intelligent monitoring system is arranged on the other side of the connecting pipe component. The intelligent monitoring system includes multiple high-precision sensor components. The multiple high-precision sensor components are distributed around the well wall and are used to collect environmental parameters such as pressure, temperature and humidity.

[0008] Optionally, the detachable filter assembly further comprises a plurality of protective openings opened on the inner wall of the built-in connecting pipe, and a telescopic wall is fixedly installed inside the protective opening; The first positioning filter assembly comprises a first positioning filter plate slidably mounted inside the protective opening, and a first filter element is fixedly mounted on one side of the auxiliary filter plate.

[0009] Optionally, the auxiliary adjustment component includes a second positioning filter component slidably installed inside the protective opening, the telescopic wall is fixedly installed on the upper and lower sides of the first positioning filter plate and the second positioning filter component, the second positioning filter component and the first positioning filter plate are fixedly installed with an electric telescopic rod on one side passing through the telescopic wall, the electric telescopic rod is fixedly installed on the inner wall of the built-in connecting tube, and a positioning rod is installed inside the second positioning filter component.

[0010] Optionally, a microbubble injection tube is fixedly installed on the outside of the built-in connecting tube, a control valve stem is slidably installed on the outside of the microbubble injection tube, a first spring is fixedly installed between the control valve stem and the microbubble injection tube, a sliding rod is fixedly installed on one side of the control valve stem, a side of the sliding rod away from the microbubble injection tube is fixedly installed on the outside of the electric telescopic rod, and the microbubble injection tube is arranged in a connected state with the microbubble injection system.

[0011] Optionally, the first positioning filter assembly also includes an auxiliary filter plate rotatably mounted on the bottom of the first positioning filter plate, a first filter element is fixedly mounted on one side of the auxiliary filter plate, a plurality of transverse slide rails are opened on the outer side of the first positioning filter plate, a plurality of arc tracks are opened on the outer side of the auxiliary filter plate, an auxiliary sliding column is slidably mounted inside the auxiliary filter plate and the arc tracks, an auxiliary connecting long rod is fixedly mounted on one side of the auxiliary sliding column passing through the auxiliary filter plate, a second telescopic cleaning ring is fixedly mounted on one side of the auxiliary connecting long rod, and a first telescopic cleaning ring is fixedly mounted on the other side of the auxiliary connecting long rod.

[0012] Optionally, an external threaded tube is fixedly installed on the side of the auxiliary filter plate away from the first positioning filter plate, and the external threaded tube is rotatably installed on the inner wall of the built-in connecting tube. A guide ball block is fixedly installed on the inner wall of the built-in connecting tube, and the guide ball block is slidably installed in the thread of the external threaded tube.

[0013] Optionally, a second filter element is fixedly mounted on one side of the second positioning filter assembly, a cleaning frame is provided on the inner wall of the second positioning filter assembly, and the cleaning frame is attached to the second filter element.

[0014] Optionally, a pressure sensing component is installed on one side of the second positioning and filtering component, a scraping frame is fixedly installed on the outside of the pressure sensing component, a second spring is fixedly installed inside the pressure sensing component, and a telescopic rod is fixedly installed on one side of the second spring.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: 1. After the ultrasonic generator is activated, it generates high-frequency vibration, which makes the gas in the fracturing fluid form numerous stable tiny bubbles. When the fracturing fluid carrying microbubbles contacts the coal seam underground along the transmission pipeline, the bubbles quickly adhere to the surface of the loose coal powder and lift it to the top area with the help of buoyancy to avoid sedimentation and mixing into the mainstream passage; 2. As the auxiliary sliding column rotates along the arc track, the auxiliary sliding column slides under the guidance of the transverse slide rail, and the auxiliary sliding column drives the first telescopic cleaning ring and the second telescopic cleaning ring to move outward through the auxiliary connecting long rod. During the outward movement of the first telescopic cleaning ring and the second telescopic cleaning ring, the first telescopic cleaning ring and the second telescopic cleaning ring expand outward through telescopicity to scrape and clean the surface of the first filter element, thereby avoiding clogging of the filter component and extending the service life of the filter element; 3. As the second positioning filter assembly moves downward, the scraper frame rotates along with the positioning rod, stirring and pushing the fracturing fluid to various positions of the underground coal seam wall below, thereby improving the effect of preventing coal powder. At the same time, when in contact with the fracturing fluid, the second spring is used to vibrate to shake off the coal powder or fracturing fluid on the surface, and the pressure of the telescopic rod is used to understand whether the fracturing fluid is sprayed out normally, thereby improving the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the coal bed gas fracturing and coal powder prevention device of the present invention; Figure 2 It is a structural schematic diagram of the first positioning filter plate of the present invention; Figure 3 It is a structural schematic diagram of the first positioning and filtering component of the present invention; Figure 4 This is a schematic diagram of the structure of the first telescopic cleaning ring of the present invention. Figure 5 The schematic diagram of the structure of the externally threaded pipe of the present invention is Figure 6 The structural schematic diagram of the scraping frame of the present invention is Figure 7 For the present invention Figure 6 Enlarged view of the middle A area Figure 8 For the present invention Figure 6 Magnified view of the middle B area.

[0017] Reference numerals: 1. connecting pipe assembly; 101. external connecting pipe; 102. internal connecting pipe; 2. detachable filter assembly; 201. first spring; 202. protective opening; 203. telescopic wall; 204. microbubble injection system; 205. electric telescopic rod; 206. sliding rod; 207. control valve stem; 208. microbubble injection pipe; 3. first positioning filter assembly; 301. first positioning filter plate; 302. transverse slide rail; 303 , auxiliary filter plate; 304, arc track; 305, auxiliary sliding column; 306, positioning rod; 307, external threaded tube; 308, first telescopic cleaning ring; 309, second telescopic cleaning ring; 310, auxiliary connecting long rod; 311, guide ball block; 4, auxiliary adjustment component; 401, second positioning filter component; 402, cleaning frame; 403, scraping frame; 404, second spring; 405, telescopic rod; 406, pressure sensing component. DETAILED DESCRIPTION

[0018] The technical solution of the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] The components of the embodiments of the present application generally described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0020] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0021] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] The high-efficiency coalbed methane fracturing and coal dust prevention device proposed by the present invention comprises a connecting pipe assembly 1, an ultrasonic generator is arranged on one side of the connecting pipe assembly 1, the connecting pipe assembly 1 comprises a built-in connecting pipe 102, and an external connecting pipe 101 is plugged into the outer side of the built-in connecting pipe 102. A detachable filter assembly 2 is installed inside the connecting pipe assembly 1, and the detachable filter assembly 2 comprises a microbubble injection system 204. The ultrasonic generator is electrically connected to the microbubble injection system 204. A transmission pipeline for connecting the ground station and the downhole equipment is arranged inside the built-in connecting pipe 102. The ultrasonic generator is installed on the ground and connected to the transmission pipeline. The microbubble injection system 204 adopts an electrically closable valve, which is in an open state when the fracturing fluid is introduced and in a closed state when not in use, so as to prevent coal dust from entering the equipment.

[0024] The first positioning filter component 3 and the auxiliary adjustment component 4 with automatic cleaning function are installed inside the connecting pipe component 1. The other side of the connecting pipe component 1 is provided with an intelligent monitoring system, which includes a plurality of high-precision sensor components. The plurality of high-precision sensor components are distributed around the well wall and are used to collect environmental parameters such as pressure, temperature and humidity. Figure 1 and Figure 6 First, after the ultrasonic generator is activated, it generates high-frequency vibrations, causing the gas in the fracturing fluid to form numerous stable tiny bubbles. When the fracturing fluid carrying microbubbles contacts the coal seam underground along the transmission pipeline, the bubbles quickly adhere to the surface of the loose coal powder and are lifted to the top area by buoyancy to avoid settling and mixing into the mainstream passage.

[0025] At the same time, the intelligent monitoring system continuously collects changes in various parameters. When an abnormal signal is detected, it will trigger a preset logical judgment, such as increasing bubble production or slowing down the fracturing speed, etc., to keep the overall process smooth. The first positioning filter component 3 and the auxiliary adjustment component 4 serve as the last line of defense to further purify the mixed fluid returning to the upper part and remove residual coal dust to prevent them from interfering with the work of subsequent links. The first positioning filter component 3 and the auxiliary adjustment component 4 can be disassembled and cleaned and replaced when they are recovered later. The real-time information of the high-precision sensor component can be understood through the terminal, so that remote managers can also understand the latest progress in real time and make corresponding decisions in time.

[0026] The detachable filter assembly 2 further includes a plurality of protective openings 202 formed on the inner wall of the built-in connecting pipe 102, and a telescopic wall 203 is fixedly installed inside the protective openings 202; The first positioning filter assembly 3 includes a first positioning filter plate 301 slidably mounted inside the protective opening 202, a first filter element is fixedly mounted on one side of the auxiliary filter plate 303, the auxiliary adjustment assembly 4 includes a second positioning filter assembly 401 slidably mounted inside the protective opening 202, the telescopic wall 203 is fixedly mounted on the upper and lower sides of the first positioning filter plate 301 and the second positioning filter assembly 401, the second positioning filter assembly 401 includes the same mechanism as the first positioning filter plate 301, the auxiliary filter plate 303 and the auxiliary sliding column 305, the second positioning filter assembly 401 and the first positioning filter plate 301 are both fixedly mounted with an electric telescopic rod 205 on one side passing through the telescopic wall 203, the electric telescopic rod 205 is fixedly mounted on the inner wall of the built-in connecting pipe 102, and a positioning rod 306 is installed inside the second positioning filter assembly 401, refer to Figure 2 and Figure 7 If the first positioning filter plate 301 and the second positioning filter assembly 401 need to be cleaned, the telescopic end of the electric telescopic rod 205 drives the first positioning filter plate 301 and the second positioning filter assembly 401 to slide up and down along the protective opening 202. During this process, since the telescopic wall 203 has a telescopic movement, as the first positioning filter plate 301 and the second positioning filter assembly 401 slide, the protective opening 202 is always in a sealed state to prevent coal powder from entering the interior of the equipment; A microbubble injection tube 208 is fixedly installed on the outer side of the built-in connecting tube 102, a control valve stem 207 is slidably installed on the outer side of the microbubble injection tube 208, a first spring 201 is fixedly installed between the control valve stem 207 and the microbubble injection tube 208, a sliding rod 206 is fixedly installed on one side of the control valve stem 207, and a side of the sliding rod 206 away from the microbubble injection tube 208 is fixedly installed on the outer side of the electric telescopic rod 205, and the microbubble injection tube 208 is connected to the microbubble injection system 204. Figure 2 - Figure 5 When the second positioning filter assembly 401 and the first positioning filter plate 301 move upward, away from the spraying position of the microbubble injection system 204, the telescopic end of the electric telescopic rod 205 drives the control valve stem 207 to move upward along the microbubble injection tube 208 through the sliding rod 206. At this time, the single spraying amount is increased to facilitate the injection of the fracturing fluid. When the second positioning filter assembly 401 and the first positioning filter plate 301 move downward, it is convenient for the scraper frame 403 to contact the fracturing fluid for stirring and spreading.

[0027] like Figure 1 and Figure 3As shown, the first positioning filter assembly 3 also includes an auxiliary filter plate 303 rotatably mounted on the bottom of the first positioning filter plate 301, a plurality of transverse slide rails 302 are provided on the outer side of the first positioning filter plate 301, a plurality of arc tracks 304 are provided on the outer side of the auxiliary filter plate 303, auxiliary sliding columns 305 are slidably mounted inside the auxiliary filter plate 303 and the arc tracks 304, an auxiliary connecting long rod 310 is fixedly mounted on one side of the auxiliary sliding column 305 passing through the auxiliary filter plate 303, a second telescopic cleaning ring 309 is fixedly mounted on one side of the auxiliary connecting long rod 310, a first telescopic cleaning ring 308 is fixedly mounted on the other side of the auxiliary connecting long rod 310, an external threaded tube 307 is fixedly mounted on the side of the auxiliary filter plate 303 away from the first positioning filter plate 301, the external threaded tube 307 is rotatably mounted on the inner wall of the built-in connecting tube 102, a guide ball block 311 is fixedly mounted on the inner wall of the built-in connecting tube 102, and the guide ball block 311 is slidably mounted in the thread of the external threaded tube 307, refer to Figure 5 When the external threaded tube 307 is pulled upward by the first positioning filter plate 301, the external threaded tube 307 contacts the guide ball block 311 due to the threads on the surface, and the guide ball block 311 is set in a fixed state. The auxiliary filter plate 303, the first positioning filter plate 301, the external filter screen and the second positioning filter assembly 401 use ceramic filter elements, and the external threaded tube 307 uses a stainless steel frame with a lighter overall texture. When the external threaded tube 307 rises, the threads on its outside generate a rotational force under the contact pressure of the guide ball block 311, and the external threaded tube 307 rotates correspondingly along the bottom of the first positioning filter plate 301 through the auxiliary filter plate 303, and the external threaded tube 307 drives the auxiliary filter plate 303 to rotate. The filter plate 303 rotates. Since the auxiliary sliding column 305 is limited by the arc track 304 and the transverse slide rail 302, as the auxiliary sliding column 305 rotates along the arc track 304, the auxiliary sliding column 305 slides under the guidance of the transverse slide rail 302. The auxiliary sliding column 305 drives the first telescopic cleaning ring 308 and the second telescopic cleaning ring 309 to move outward through the auxiliary connecting long rod 310. During the outward movement of the first telescopic cleaning ring 308 and the second telescopic cleaning ring 309, the first telescopic cleaning ring 308 and the second telescopic cleaning ring 309 expand outwardly through telescopicity to scrape and clean the surface of the first filter element, thereby avoiding clogging of the filter assembly and extending the service life of the filter element. Due to the protection of the second filter element, the coal powder particles covering the first filter element are smaller and easier to remove.

[0028] Secondly, a second filter element is fixedly installed on one side of the second positioning filter assembly 401. The first filter element and the second filter element are complete filter mesh components without gaps. A cleaning rack 402 is provided on the inner wall of the second positioning filter assembly 401, and the cleaning rack 402 is attached to the second filter element. Figure 3When the second positioning filter assembly 401 moves up and down synchronously, its rotatable surface rotates along the positioning surface, and its rotating surface drives the cleaning frame 402 to scrape along the second filter element through the positioning rod 306. Since the second filter element is close to the underground coal seam and the fracturing fluid delivery layer, its surface is covered with more coal powder. Therefore, the cleaning frame 402 with better cleaning effect is used to work, and the electric telescopic rod 205 moves up and down to clean at a place far away from the microbubble injection system 204 to prevent interference with the injection of fracturing fluid. A pressure sensing assembly 406 is installed on one side of the second positioning filter assembly 401, and a scraping frame 403 is fixedly installed on the outer side of the pressure sensing assembly 406. A second spring 404 is fixedly installed inside the pressure sensing assembly 406, and a telescopic rod 405 is fixedly installed on one side of the second spring 404. Figure 8 As the second positioning filter assembly 401 moves downward, the scraper frame 403 rotates along with the positioning rod 306, stirring and pushing the fracturing fluid to various positions of the underground coal seam wall below, thereby improving the effect of preventing coal powder. At the same time, when in contact with the fracturing fluid, the second spring 404 is vibrated to shake off the coal powder or fracturing fluid on the surface, and the pressure of the telescopic rod 405 is used to understand whether the fracturing fluid is sprayed normally, thereby improving the stability of the device.

[0029] In this embodiment, the design concept of the efficient coalbed methane fracturing anti-coal powder device is to integrate advanced microbubble technology and intelligent control system to build a complete coal powder management solution. It injects a large number of tiny bubbles into the fracturing fluid, which can efficiently absorb coal powder and reduce the possibility of it entering the production pipeline. At the same time, by arranging a highly sensitive sensor network to monitor the changes in the underground environment in real time, once an abnormality is detected, it can respond quickly to adjust the amount of microbubble generation or the flow rate of the fracturing fluid to ensure the stability and safety of the underground working environment. The designed detachable auxiliary adjustment component 4 and the first positioning filter component 3 are located near the wellhead, dedicated to capturing a small amount of coal powder that is not completely absorbed by the microbubbles, and are equipped with a self-cleaning function to ensure the continuous and efficient operation of the system.

[0030] In addition, the present invention can also use biodegradable foaming agents instead of air as the core component of the bubbles, which can both enhance the adsorption effect and reduce the ecological burden. In addition, for mining areas with special coal powder characteristics under certain geological conditions, the adaptability of different types of microbubble systems can be tested in advance in the laboratory to simulate the actual environment, so as to select the best configuration.

[0031] The above-mentioned specific embodiments are merely preferred embodiments of the present application. Based on the technical solutions of the present application and the relevant inspirations of the above-mentioned embodiments, those skilled in the art may make various alternative improvements and combinations to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely explanations of the present application, and they are not limitations of the present application.

Claims

1. An efficient coal bed gas fracturing and coal powder prevention device, comprising a connecting pipe assembly (1), characterized in that: An ultrasonic generator is provided on one side of the connecting pipe assembly (1), and the connecting pipe assembly (1) comprises an internal connecting pipe (102), and an external connecting pipe (101) is plugged into the outer side of the internal connecting pipe (102); A detachable filter assembly (2) is installed inside the connecting pipe assembly (1), the detachable filter assembly (2) comprises a microbubble injection system (204), and the ultrasonic generator is electrically connected to the microbubble injection system (204); A first positioning filter component (3) and an auxiliary adjustment component (4) having an automatic cleaning function are installed inside the connecting pipe component (1), and an intelligent monitoring system is arranged on the other side of the connecting pipe component (1). The intelligent monitoring system comprises a plurality of high-precision sensor components, and the plurality of high-precision sensor components are distributed around the well wall and are used to collect environmental parameters such as pressure, temperature and humidity.

2. The high-efficiency coal bed gas fracturing and coal powder prevention device according to claim 1 is characterized in that: The detachable filter assembly (2) further comprises a plurality of protective openings (202) formed on the inner wall of the built-in connecting pipe (102), wherein a telescopic wall (203) is fixedly installed inside the protective openings (202); The first positioning filter assembly (3) comprises a first positioning filter plate (301) slidably mounted inside the protective opening (202).

3. The high-efficiency coal bed gas fracturing and coal powder prevention device according to claim 2 is characterized in that: The auxiliary adjustment component (4) comprises a second positioning filter component (401) slidably mounted inside the protective opening (202); the telescopic wall (203) is fixedly mounted on the first positioning filter plate (301) and the upper and lower sides of the second positioning filter component (401); the second positioning filter component (401) and the first positioning filter plate (301) are both fixedly mounted with an electric telescopic rod (205) on one side passing through the telescopic wall (203); the electric telescopic rod (205) is fixedly mounted on the inner wall of the built-in connecting pipe (102); and a positioning rod (306) is mounted inside the second positioning filter component (401).

4. The high-efficiency coal bed gas fracturing and coal powder prevention device according to claim 3 is characterized in that: A microbubble injection tube (208) is fixedly mounted on the outer side of the built-in connecting tube (102), a control valve stem (207) is slidably mounted on the outer side of the microbubble injection tube (208), a first spring (201) is fixedly mounted between the control valve stem (207) and the microbubble injection tube (208), a sliding rod (206) is fixedly mounted on one side of the control valve stem (207), a side of the sliding rod (206) away from the microbubble injection tube (208) is fixedly mounted on the outer side of the electric telescopic rod (205), and the microbubble injection tube (208) is arranged in a connected state with the microbubble injection system (204).

5. The high-efficiency coal bed gas fracturing and coal powder prevention device according to claim 4 is characterized in that: The first positioning filter assembly (3) further comprises an auxiliary filter plate (303) rotatably mounted at the bottom of the first positioning filter plate (301); a first filter element is fixedly mounted on one side of the auxiliary filter plate (303); a plurality of transverse slide rails (302) are provided on the outer side of the first positioning filter plate (301); a plurality of arc tracks (304) are provided on the outer side of the auxiliary filter plate (303); an auxiliary sliding column (305) is slidably mounted inside the auxiliary filter plate (303) and the arc tracks (304); an auxiliary connecting rod (310) is fixedly mounted on one side of the auxiliary sliding column (305) passing through the auxiliary filter plate (303); a second telescopic cleaning ring (309) is fixedly mounted on one side of the auxiliary connecting rod (310); and a first telescopic cleaning ring (308) is fixedly mounted on the other side of the auxiliary connecting rod (310).

6. The high-efficiency coal bed gas fracturing and coal powder prevention device according to claim 5 is characterized in that: An external threaded tube (307) is fixedly mounted on a side of the auxiliary filter plate (303) away from the first positioning filter plate (301); the external threaded tube (307) is rotatably mounted on the inner wall of the built-in connecting tube (102); a guide ball block (311) is fixedly mounted on the inner wall of the built-in connecting tube (102); the guide ball block (311) is slidably mounted in the threads of the external threaded tube (307).

7. The high-efficiency coal bed gas fracturing and coal powder prevention device according to claim 3 is characterized in that: A second filter element is fixedly mounted on one side of the second positioning filter assembly (401), a cleaning frame (402) is provided on the inner wall of the second positioning filter assembly (401), and the cleaning frame (402) is attached to the second filter element.

8. The high-efficiency coal bed gas fracturing and coal powder prevention device according to claim 7 is characterized in that: A pressure sensing component (406) is installed on one side of the second positioning and filtering component (401), a scraping frame (403) is fixedly installed on the outside of the pressure sensing component (406), a second spring (404) is fixedly installed inside the pressure sensing component (406), and a telescopic rod (405) is fixedly installed on one side of the second spring (404).

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