An adjustable multi-station cleaning test machine for biogas slurry filtration

Abstract

This invention provides an adjustable multi-station cleaning test machine for biogas slurry filtration, comprising a rotating drum and an outer cover. The rotating drum includes a rotating main shaft and a filter screen. The rotating main shaft drives the filter screen to rotate. The outer cover is disposed outside the rotating drum to isolate the rotating drum from the outside. It also includes four sets of cleaning mechanisms, which are evenly arranged at 90° intervals along the circumference of the rotating drum. The four sets of cleaning mechanisms are a negative pressure air suction cleaning mechanism, a positive pressure air flushing cleaning mechanism, a positive pressure water flushing cleaning mechanism, and a bidirectional brushing cleaning mechanism. This application integrates multiple cleaning methods and provides a comprehensive research platform: This device is the first to integrate four different types of filter screen cleaning methods (brushing, water flushing, air flushing, and air suction) on the same test equipment. It allows for comparative studies of the applicability, cleaning efficiency, and energy consumption of different cleaning methods under the same working conditions, providing a scientific basis for optimizing biogas slurry filtration processes.

Description

Technical Field

[0001] This invention relates to the field of mechanical equipment, and in particular to an adjustable multi-station cleaning test machine for biogas slurry filtration. Background Technology

[0002] In the resource utilization of livestock and poultry manure wastewater, biogas slurry can be used for farmland irrigation after solid-liquid separation. However, a key technical bottleneck exists in its practical application: biogas slurry still contains a certain amount of solid particles (usually ≤0.3mm in diameter). Although fermentation treatment is performed, these particles remain. These solid particles limit biogas slurry irrigation to applications with relatively coarse particle requirements, such as large-diameter high-pressure sprinkler irrigation (40-60 mesh) or irrigation (20-30 mesh) in forests and trees. For more refined and wider-ranging applications like micro-sprinkler irrigation (80-100 mesh) and drip irrigation (120 mesh), clogging of micro-sprinklers or drip irrigation inlets is very likely to occur, seriously affecting irrigation uniformity and stability, and restricting the refined and multi-scenario application of biogas slurry fertilization.

[0003] There are currently two main approaches to addressing the problem of particulate matter clogging in biogas slurry irrigation: (1) Clearing terminal blockages - Irrigation inlet cleaning plan This solution involves installing an automatic water flushing device at the irrigation inlet (micro-sprinkler, drip irrigation inlet) to attempt to remove blockages through timed or scheduled flushing. However, the following problems exist in practical application: ① Solid particulate matter contains many impurities and has a wide particle size distribution, making it difficult to remove completely by rinsing; ② When irrigation batches are spaced at different intervals, the residue is prone to hardening and solidifying; ③ The cleaning effect is unstable, and frequent manual inspections and cleaning are still required, which increases the operation and maintenance costs; ④ The uniformity and stability of irrigation are difficult to guarantee, which affects the effectiveness of agricultural production.

[0004] (2) Cleaning front-end blockages - biogas slurry filtration solution This solution focuses on removing solid particles from the biogas slurry through filtration equipment before it enters the irrigation system, and specifically includes two main technical approaches: Path 1: Natural settling filtration This method involves constructing large settling ponds or tanks to allow solid particles to settle and separate naturally over a long period. The disadvantage of this method is that it requires a large amount of land resources to construct the settling facilities. ①Long settling time and low processing efficiency; ②Large capital investment and long construction period; ③ It is difficult to meet the needs of large-scale and continuous processing.

[0005] Path 2: Mechanical screening and filtration Based on the initial coarse screening solid-liquid separation equipment for sewage, a high-interception-rate (high-mesh) screen is used for secondary filtration. Currently, the main equipment types on the market include: ① Inclined plate screen filtration equipment: This type of equipment uses gravity to filter biogas slurry through an inclined screen. However, it suffers from problems such as low throughput, insufficient filtration, easy clogging of the screen, and poor cleaning efficiency.

[0006] ② Rotary drum filter: This type of filter uses a rotating drum-shaped filter screen for filtration, with a typical rotation speed of around 20 r / min. While the filtration effect is improved compared to the inclined plate type, it suffers from insufficient internal operating space due to interference from components such as the inner edge of the drum's discharge spiral and the main shaft. This results in a limited cleaning method (vibration or fixed rinsing), leading to poor cleaning performance and persistent filter clogging issues.

[0007] ③ Centrifugal filtration equipment: These have higher rotational speeds (generally around 1000 r / min), resulting in better throughput and efficiency than the previous two types. They also offer more internal space, facilitating the design and operation of related experimental devices. However, existing centrifugal equipment filter cleaning methods are still limited to fixed-angle water flushing, air flushing, or fixed-installation brushes / scrapers, which have limited effectiveness in cleaning fibrous impurities embedded in the filter pores. The aforementioned prior art has the following drawbacks: Disadvantage 1: The cleaning method is limited and cannot meet the needs of different blockage conditions; Existing equipment is usually equipped with only one cleaning method, while the blockages in biogas slurry are diverse in form, including fibrous impurities (such as pig hair), granular sediments, and sticky colloids. A single cleaning method is difficult to completely and effectively remove all kinds of blockages. Disadvantage 2: The cleaning device has a fixed angle, which limits the cleaning effect; Whether using water flushing, air flushing, air suction, or brushing, most existing cleaning devices are installed at a fixed angle. Water / air flushing nozzles are usually vertically aligned with the filter screen, resulting in insufficient impact force on tangential deposits; air suction nozzles, with their vertical suction, are unable to effectively remove fibrous impurities stuck in the filter screen pores; and brushes can only brush in one direction with the filter screen, failing to simulate the up-and-down brushing motion of a human. Disadvantage 3: Lack of a comprehensive testing platform makes it difficult to optimize cleaning process parameters; Currently, there is a lack of specialized testing equipment on the market for studying the comparative effects of different cleaning methods and optimizing process parameters. Researchers and equipment manufacturers cannot conduct comparative studies on the applicability of different cleaning methods on the same equipment under identical operating conditions, which hinders the advancement of biogas slurry filtration technology. Summary of the Invention

[0008] (a) Technical problems to be solved To address the aforementioned problems in the prior art, this invention provides an adjustable multi-station cleaning test machine for biogas slurry filtration.

[0009] (II) Technical Solution To achieve the above objectives, the main technical solutions adopted by the present invention include: An adjustable multi-station cleaning test machine for biogas slurry filtration includes a rotating drum and an outer cover. The rotating drum includes a rotating main shaft and a filter screen. The rotating main shaft drives the filter screen to rotate. The outer cover is disposed outside the rotating drum to isolate the rotating drum from the outside. It also includes four sets of cleaning mechanisms. The four sets of cleaning mechanisms are evenly arranged at 90° intervals along the circumference of the rotating drum. Each cleaning device is independently installed and equipped with an independent control system. Each cleaning device can be put into operation independently, or any number of cleaning devices can be put into operation simultaneously in any combination. The four sets of cleaning mechanisms are a negative pressure air suction cleaning mechanism, a positive pressure air flushing cleaning mechanism, a positive pressure water flushing cleaning mechanism, and a bidirectional brushing cleaning mechanism. The negative pressure air suction cleaning mechanism is used to remove fibrous impurities from the filter screen pores; The positive pressure air flushing cleaning mechanism is used to clean the filter screen under waterless conditions; The positive pressure water flushing cleaning mechanism is used to remove the adhering substances from the surface of the filter screen by utilizing the shear force of the water flow; The bidirectional brushing cleaning mechanism is used to simulate manual up-and-down brushing motions to remove residues from the filter screen.

[0010] Preferably, the bidirectional brush-type cleaning mechanism includes a brush assembly and a drive assembly; The brush assembly is in contact with the inner wall of the filter screen; The drive assembly is connected to the brush assembly and drives the brush assembly to reciprocate up and down. The drive assembly includes a frame, a drive motor, an eccentric elliptical block, a first connecting rod, and a second connecting rod. The frame is mounted on top of the outer casing; The drive motor is mounted on the frame and is connected to the eccentric elliptical block; The surface of the eccentric elliptical block is rotatably connected to one end of the first connecting rod, and the other end of the first connecting rod is connected to the second connecting rod; The second link is connected to the brush assembly at the end furthest from the first link.

[0011] Preferably, the brush assembly includes a brush mounting bracket and brush bristles disposed on the brush mounting bracket, the brush bristles being in contact with the inner wall of the filter screen.

[0012] Preferably, it also includes a limiting component, which includes a fixed rod and a horizontal rod; One end of the fixing rod is connected to the top of the inner wall of the outer cover; At least one horizontal bar is provided, one end of which is fixedly connected to the fixed bar, and the other end of which is provided with a slider. The brush mounting bracket has a movable groove corresponding to the slider.

[0013] Preferably, the negative pressure air suction cleaning mechanism includes a rotary motor, a rotary arm, a lifting motor, an adjustment component, and a negative pressure adsorption component; The adjustment assembly includes a first fixed-length rod, a second fixed-length rod, and a telescopic rod; The first fixed-length rod and the second fixed-length rod are arranged parallel to each other, and the first fixed-length rod and the second fixed-length rod are respectively connected to the top of the outer cover through a universal ball bearing support frame and a lifting motor; The telescopic rod is provided in multiple parts, which are arranged in parallel to each other, and the two ends of the telescopic rod are respectively rotatably connected to the first fixed-length rod and the second fixed-length rod. The negative pressure adsorption assembly includes a vacuum pump, compressed air pipeline, telescopic hose, and suction head; The vacuum pump is connected to multiple telescopic hoses through the compressed air pipeline, and the suction head is installed at the end of the telescopic hose away from the compressed air pipeline. The suction head is mounted on the telescopic rod via a bracket; The lifting end of the lifting motor is connected to the top of the second fixed-length rod; The rotating end of the rotary motor is connected to the rotating arm, and the rotating arm is connected to the lifting motor; The top of the outer cover has a movable groove corresponding to the universal ball bearing support frame.

[0014] Preferably, the positive pressure air flushing cleaning mechanism and the negative pressure air suction cleaning mechanism have the same rotary motor, rotary arm, lifting motor and adjustment components. The only difference between the two is the setting of the negative pressure adsorption component. The positive pressure air flushing cleaning mechanism adopts a flushing component, which includes an air pump, a delivery pipeline, a flushing hose and a flushing head.

[0015] Preferably, the positive pressure water flushing cleaning mechanism and the positive pressure air flushing cleaning mechanism have the same rotary motor, rotary arm, lifting motor, adjustment component and flushing component. The only difference between the two is the pump configuration, with the positive pressure water flushing cleaning mechanism using a water pump.

[0016] Preferably, a control valve is provided on both the delivery pipeline and the compressed air pipeline.

[0017] (III) Beneficial Effects The beneficial effects of this invention are as follows: 1. Integrating multiple cleaning methods and providing a comprehensive research platform: This device is the first to integrate four different types of filter cleaning methods (brushing, water flushing, air flushing, and air suction) on the same test equipment. It can compare and study the applicability, cleaning efficiency and energy consumption of different cleaning methods under the same working conditions, providing a scientific basis for optimizing the biogas slurry filtration process. 2. Adjustable cleaning device angle significantly improves cleaning effect: Each cleaning device has a multi-degree-of-freedom angle adjustment function, which can simulate manual brushing action, form an oblique flushing flow, and achieve multi-directional suction force, effectively solving the problem of poor cleaning effect of traditional fixed-angle cleaning devices on fibrous and embedded impurities; 3. Modular design facilitates flexible combination of test schemes: The four cleaning devices are evenly arranged at 90 degrees, which can be operated individually to study the characteristics of a single cleaning method, or combined to study the synergistic cleaning effect, meeting diverse test needs; 4. Adjustable and controllable parameters support process optimization research: parameters such as drum speed, cleaning device angle, and running sequence can be precisely set and automatically recorded through the control system, which facilitates the study of the influence of each parameter on the cleaning effect and provides optimization solutions for practical engineering applications; 5. Applicable to various filtration methods, expanding the scope of application: This device is designed based on centrifugal filtration equipment, but with appropriate modifications, it can be applied to the research of filter screen cleaning of other types of solid-liquid separation equipment such as drum type and inclined plate type, and has good versatility and promotion value; 6. Resource conservation and environmental protection: Comparative studies can select the most economical cleaning method (such as the energy consumption comparison between water flushing and air flushing), avoiding the blind adoption of high-energy-consuming cleaning methods; air flushing and air suction devices do not require water and are suitable for water-scarce scenarios; brushing devices do not require external media, saving energy and protecting the environment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an adjustable multi-station cleaning test machine for biogas slurry filtration; Figure 2 This is a schematic diagram of the bidirectional brush cleaning mechanism; Figure 3 This is a schematic diagram of the drive component. Figure 4 A schematic diagram of a negative pressure air suction cleaning mechanism; Figure 5 Schematic diagram of the negative pressure air suction cleaning mechanism in use Figure 1 ; Figure 6 Schematic diagram of the negative pressure air suction cleaning mechanism in use Figure 2 ; Figure 7 This is a schematic diagram of the positive pressure air flushing cleaning mechanism; Figure 8 This is a schematic diagram of a positive pressure water flushing cleaning mechanism.

[0019] [Explanation of Labels in the Attached Image] 1. Outer cover; 2. Rotating drum; 3. Negative pressure air suction cleaning mechanism; 31. Rotary motor; 32. Rotary arm; 33. Lifting motor; 34. Adjustment assembly; 341. First fixed-length rod; 342. Second fixed-length rod; 343. Telescopic rod; 35. Negative pressure adsorption assembly; 351. Vacuum pump; 352. Compressed air pipeline; 353. Telescopic flexible hose; 354. Suction head; 4. Positive pressure air flushing cleaning mechanism; 41. Air pump; 42. Delivery pipeline; 43. Flushing hose; 44. Flushing head; 5. Positive pressure water flushing cleaning mechanism; 51. Water pump; 6. Two-way brush cleaning mechanism; 61. Brush assembly; 611. Brush bristles; 612. Brush mounting bracket; 62. Drive assembly; 621. Eccentric elliptical block; 622. First connecting rod; 623. Second connecting rod; 63. Limiting assembly; 631. Fixing rod; 632. Horizontal rod. Detailed Implementation

[0020] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Please refer to Figures 1 to 8 This invention provides an adjustable multi-station cleaning test machine for biogas slurry filtration, including a drum 2 and an outer cover 1. The drum 2 includes a rotating main shaft and a filter screen. The rotating main shaft drives the filter screen to rotate. The outer cover 1 is set outside the drum 2 to isolate the drum 2 from the outside. It also includes four sets of cleaning mechanisms. The four sets of cleaning mechanisms are evenly arranged at 90° intervals along the circumference of the drum 2. Each cleaning device is independently installed and equipped with an independent control system. Each cleaning device can be put into operation alone, or any number of cleaning devices can be put into operation simultaneously in any combination. The four sets of cleaning mechanisms are a negative pressure air suction cleaning mechanism 3, a positive pressure air flushing cleaning mechanism 4, a positive pressure water flushing cleaning mechanism 5, and a bidirectional brushing cleaning mechanism 6. The negative pressure air suction cleaning mechanism 3 is used to remove fibrous impurities from the filter screen pores; The positive pressure air flushing cleaning mechanism 4 is used to clean the filter screen under waterless conditions; The positive pressure water flushing cleaning mechanism 5 is used to peel off the adhering substances on the surface of the filter screen using the shear force of the water flow; The bidirectional brush cleaning mechanism 6 is used to simulate manual up-and-down brushing motions to remove residues from the filter screen; When using it, you can select the following operating modes: Single-mode operation: Only one cleaning mechanism is activated, while other devices remain in standby or raised state, for example: Start the bidirectional brush cleaning mechanism 6 and observe the effect of the combined up-and-down brushing motion of the brush on the removal of fibrous impurities; Start the positive pressure water flushing cleaning mechanism 5, and study the effect of different flushing angles on the particulate matter removal effect by adjusting the nozzle angle; Activate positive pressure air jet cleaning mechanism 4 to study the applicability of airflow impact cleaning under waterless conditions and the optimal spray angle; The negative pressure air suction cleaning mechanism 3 was activated to study the suction efficiency of the suction head 354 angle change on impurities stuck in the filter mesh.

[0022] Combined mode operation: Simultaneously activate two or more cleaning devices to study the synergistic cleaning effect. For example: The two-way brush cleaning mechanism 6 is used in combination with the positive pressure water flushing cleaning mechanism 5: first, the stubborn attachments are loosened by brushing, and then rinsed with water. The positive pressure air flushing cleaning mechanism 4 and the negative pressure air suction cleaning mechanism 3 are used in combination: first, the loose impurities are blown away with high pressure airflow, and then they are removed by negative pressure suction. Four cleaning units are used simultaneously: simulating enhanced cleaning under extreme conditions to evaluate the synergistic effect of multiple methods.

[0023] In this embodiment, the bidirectional brush cleaning mechanism 6 includes a brush assembly 61 and a drive assembly 62; The brush assembly 61 is in contact with the inner wall of the filter screen; The drive assembly 62 is connected to the brush assembly 61 and drives the brush assembly 61 to move up and down reciprocally. The drive assembly 62 includes a frame, a drive motor, an eccentric elliptical block 621, a first connecting rod 622 and a second connecting rod 623. The frame is mounted on top of the outer casing 1; The drive motor is mounted on the frame and is connected to the eccentric elliptical block 621. The surface of the eccentric elliptical block 621 is rotatably connected to one end of the first link 622, and the other end of the first link 622 is connected to the second link 623; The second link 623 connects to the brush assembly 61 at the end furthest from the first link 622.

[0024] The brush assembly 61 includes a brush mounting bracket 612 and brush bristles 611 disposed on the brush mounting bracket 612, with the brush bristles 611 in contact with the inner wall of the filter screen.

[0025] It also includes a limiting component 63, which includes a fixed rod 631 and a horizontal rod 632; One end of the fixing rod 631 is connected to the top of the inner wall of the outer cover 1; At least one horizontal bar 632 is provided. One end of the horizontal bar 632 is fixedly connected to the fixed bar 631, and the other end of the horizontal bar 632 is provided with a slider. The brush mounting bracket 612 is provided with a movable groove corresponding to the slider. In use, the drive motor is started, which drives the eccentric elliptical block 621 to rotate. The rotational motion of the eccentric elliptical block 621 is converted into the up-and-down reciprocating oscillation of the brush mounting frame 612 through the first connecting rod and the second connecting rod. The bristles 611 on the brush mounting frame 612 move up and down with the brush mounting frame 612. At the same time, due to the rotation of the drum 2, the bristles 611 form a compound brushing trajectory in the up-and-down and circumferential directions on the filter screen surface. The radial limit rod ensures that the bristles 611 always maintain appropriate contact pressure with the filter screen, avoiding the radial displacement caused by the oscillation that causes the bristles 611 to detach from the filter screen. The brushed-off impurities are discharged through the slag discharge port. The cleaning process can be run continuously or intermittently as needed, which significantly improves the removal effect of fibrous blockages and ensures the stable operation of the filtration system.

[0026] In this embodiment, the negative pressure air suction cleaning mechanism 3 includes a rotary motor 31, a rotary arm 32, a lifting motor 33, an adjustment component 34, and a negative pressure adsorption component 35. The adjustment assembly 34 includes a first fixed-length rod 341, a second fixed-length rod 342, and a telescopic rod 343; The first fixed length rod 341 and the second fixed length rod 342 are arranged parallel to each other. The first fixed length rod 341 and the second fixed length rod 342 are respectively connected to the top of the outer cover 1 through the universal ball support frame and the lifting motor 33. Multiple telescopic rods 343 are provided, and the multiple telescopic rods 343 are arranged in parallel to each other. The two ends of the telescopic rods 343 are respectively rotatably connected to the first fixed-length rod 341 and the second fixed-length rod 342. The negative pressure adsorption assembly 35 includes a vacuum pump 351, a compressed air pipeline 352, a telescopic hose 353, and a suction head 354. The vacuum pump 351 is connected to multiple telescopic hoses 353 through a compressed air pipeline 352. A suction head 354 is installed at the end of the telescopic hose 353 away from the compressed air pipeline 352. The suction head 354 is mounted on the telescopic rod 343 via a bracket; The lifting end of the lifting motor 33 is connected to the top of the second fixed-length rod 342; The rotating end of the rotary motor 31 is connected to the rotating arm 32, and the rotating arm 32 is connected to the lifting motor 33; The top of the outer cover 1 has a movable groove corresponding to the universal ball support frame; When the filter screen needs cleaning, first set the nozzle angle according to the filter screen clogging situation. The rotary motor 31 drives the rotary arm 32 to rotate to the required horizontal angle (for example, at a certain angle with the direction of filter screen rotation). The lifting motor 33 drives the second fixed-length rod 342 to move up and down. With the cooperation of the telescopic rod 343 and the first fixed-length rod 341, the suction head 354 can be driven to move up and down to a suitable height, so that the suction direction of the suction head 354 forms an acute angle with the surface of the filter screen. Then, the vacuum pump 351 is started, the control valve is opened, and the suction head 354 sucks up impurities on the surface of the filter screen and fibers stuck in the holes under negative pressure. By adjusting the angle of the suction head 354, the suction direction can be changed to enhance the ability to remove side attachments.

[0027] In this embodiment, the positive pressure air flushing cleaning mechanism 4 and the negative pressure air suction cleaning mechanism 3 have the same rotary motor 31, rotary arm 32, lifting motor 33 and adjustment component 34. The only difference between the two is the setting of the negative pressure adsorption component 35. The positive pressure air flushing cleaning mechanism 4 adopts a flushing component, which includes an air pump 41, a delivery pipeline 42, a flushing hose 43 and a flushing head 44. When in use, when the filter screen needs to be cleaned, first set the nozzle angle according to the filter screen blockage. The rotary motor 31 drives the rotary arm 32 to rotate to the required horizontal angle (for example, at a certain angle with the direction of filter screen rotation). The lifting motor 33 drives the second fixed-length rod 342 to move up and down. With the cooperation of the telescopic rod 343 and the first fixed-length rod 341, the flushing head 44 can be driven to move up and down to a suitable height, so that the flushing direction of the flushing head 44 forms an acute angle with the surface of the filter screen. Then, the control valve is opened, and high-pressure gas is sprayed onto the surface of the filter screen through the nozzle. The shearing force of the airflow is used to peel off the attached substances. During the flushing process, the nozzle angle can be dynamically adjusted to cover different areas.

[0028] In this embodiment, the positive pressure water flushing cleaning mechanism 5 and the positive pressure air flushing cleaning mechanism 4 have the same rotary motor 31, rotary arm 32, lifting motor 33, adjustment component 34 and flushing component. The only difference between the two is the setting of the pump. The positive pressure water flushing cleaning mechanism 5 uses a water pump 51. When the filter screen needs to be cleaned, the nozzle angle is first set according to the filter screen clogging condition. The rotary motor 31 drives the rotary arm 32 to rotate to the required horizontal angle (e.g., at a certain angle with the filter screen rotation direction). The lifting motor 33 drives the second fixed-length rod 342 to move up and down. With the cooperation of the telescopic rod 343 and the first fixed-length rod 341, the flushing head 44 can be driven to move up and down to a suitable height, so that the flushing direction of the flushing head 44 forms an acute angle with the filter screen surface. Then, the control valve is opened, and high-pressure water is sprayed onto the filter screen surface through the nozzle. The shear force of the water flow is used to peel off the attached substances. During the flushing process, the nozzle angle can be dynamically adjusted to cover different areas.

[0029] In this embodiment, a control valve is provided on both the delivery pipeline 42 and the compressed air pipeline 352.

[0030] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The scope of protection of this invention does not involve any improvement to the software and methods.

[0031] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention's specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An adjustable multi-station cleaning test machine for biogas slurry filtration, characterized in that, The device includes a rotating drum and an outer cover. The rotating drum includes a rotating main shaft and a filter screen. The rotating main shaft drives the filter screen to rotate. The outer cover is disposed outside the rotating drum to isolate the rotating drum from the outside. The device is characterized by further including four sets of cleaning mechanisms. The four sets of cleaning mechanisms are evenly arranged at 90° intervals along the circumference of the rotating drum. Each cleaning device is independently installed and equipped with an independent control system. Each cleaning device can be put into operation independently, or any number of cleaning devices can be put into operation simultaneously in any combination. The four sets of cleaning mechanisms are a negative pressure air suction cleaning mechanism, a positive pressure air flushing cleaning mechanism, a positive pressure water flushing cleaning mechanism, and a bidirectional brushing cleaning mechanism. The negative pressure air suction cleaning mechanism is used to remove fibrous impurities from the filter screen pores; The positive pressure air flushing cleaning mechanism is used to clean the filter screen under waterless conditions; The positive pressure water flushing cleaning mechanism is used to remove the adhering substances from the filter screen surface by utilizing the shear force of the water flow; The bidirectional brushing cleaning mechanism is used to simulate manual up-and-down brushing motions to remove residues from the filter screen.

2. The adjustable multi-station cleaning test machine for biogas slurry filtration according to claim 1, characterized in that, The bidirectional brush-type cleaning mechanism includes a brush assembly and a drive assembly; The brush assembly is in contact with the inner wall of the filter screen; The drive assembly is connected to the brush assembly and drives the brush assembly to reciprocate up and down. The drive assembly includes a frame, a drive motor, an eccentric elliptical block, a first connecting rod, and a second connecting rod. The frame is mounted on top of the outer casing; The drive motor is mounted on the frame and is connected to the eccentric elliptical block; The surface of the eccentric elliptical block is rotatably connected to one end of the first connecting rod, and the other end of the first connecting rod is connected to the second connecting rod; The second link is connected to the brush assembly at the end furthest from the first link.

3. The adjustable multi-station cleaning test machine for biogas slurry filtration according to claim 2, characterized in that, The brush assembly includes a brush mounting bracket and brush bristles disposed on the brush mounting bracket, the brush bristles being in contact with the inner wall of the filter screen.

4. An adjustable multi-station cleaning test machine for biogas slurry filtration according to claim 3, characterized in that, It also includes a limiting component, which includes a fixed rod and a horizontal rod; One end of the fixing rod is connected to the top of the inner wall of the outer cover; At least one horizontal bar is provided, one end of which is fixedly connected to the fixed bar, and the other end of which is provided with a slider. The brush mounting bracket has a movable groove corresponding to the slider.

5. An adjustable multi-station cleaning test machine for biogas slurry filtration according to claim 1, characterized in that, The negative pressure air suction cleaning mechanism includes a rotary motor, a rotary arm, a lifting motor, an adjustment component, and a negative pressure adsorption component. The adjustment assembly includes a first fixed-length rod, a second fixed-length rod, and a telescopic rod; The first fixed-length rod and the second fixed-length rod are arranged parallel to each other, and the first fixed-length rod and the second fixed-length rod are respectively connected to the top of the outer cover through a universal ball bearing support frame and a lifting motor; The telescopic rod is provided in multiple parts, which are arranged in parallel to each other, and the two ends of the telescopic rod are respectively rotatably connected to the first fixed-length rod and the second fixed-length rod. The negative pressure adsorption assembly includes a vacuum pump, compressed air pipeline, telescopic hose, and suction head; The vacuum pump is connected to multiple telescopic hoses through the compressed air pipeline, and the suction head is installed at the end of the telescopic hose away from the compressed air pipeline. The suction head is mounted on the telescopic rod via a bracket; The lifting end of the lifting motor is connected to the top of the second fixed-length rod; The rotating end of the rotary motor is connected to the rotating arm, and the rotating arm is connected to the lifting motor; The top of the outer cover has a movable groove corresponding to the universal ball bearing support frame.

6. An adjustable multi-station cleaning test machine for biogas slurry filtration according to claim 5, characterized in that, The positive pressure air flushing cleaning mechanism and the negative pressure air suction cleaning mechanism have the same rotary motor, rotary arm, lifting motor and adjustment components. The only difference between the two is the setting of the negative pressure adsorption component. The positive pressure air flushing cleaning mechanism adopts a flushing component, which includes an air pump, delivery pipeline, flushing hose and flushing head.

7. An adjustable multi-station cleaning test machine for biogas slurry filtration according to claim 6, characterized in that, The positive pressure water flushing cleaning mechanism and the positive pressure air flushing cleaning mechanism have the same rotary motor, rotary arm, lifting motor, adjustment components and flushing components. The only difference between the two is the pump configuration. The positive pressure water flushing cleaning mechanism uses a water pump.

8. An adjustable multi-station cleaning test machine for biogas slurry filtration according to claim 7, characterized in that, Control valves are installed on both the delivery pipeline and the compressed air pipeline.

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