Air filter device with impurity prevention and blockage cleaning structure

Abstract

The application discloses an air filtering device with impurity anti-blocking cleaning structure and relates to the technical field of air filtering. The air filtering device comprises a filtering box, a sealing door and an air inlet. The sealing door is rotationally connected to one side of the filtering box. The air inlet is symmetrically arranged on one side of the filtering box. The application utilizes the height rising of the sliding sleeve on the rotating shaft, the height rising of the pressing ring on the fixed ring, the height lifting of the lever on the side of the pressing ring, the height reduction of the sliding frame in the limiting frame and the contact of the brush cylinder on the sliding frame with the surface of the filter cylinder to realize the automatic brushing and cleaning of the filter cylinder during rotation. The impurities brushed off are uniformly extracted from the filtering box by the blowdown air pump. Meanwhile, the surface cleaning of the filter cylinder is automatically completed by utilizing the motor speed adjustment. The subsequent increase of the motor speed makes the brush cylinder separate from the surface of the filter cylinder, so that the service life of the brush cylinder is not affected by the long-time contact with the filter cylinder.

Description

Technical Field

[0001] This invention relates to the field of air filtration technology, specifically to an air filtration device with an impurity anti-clogging and cleaning structure. Background Technology

[0002] Air filters are air filtration devices, generally used in clean workshops, clean factories, laboratories and clean rooms, or in dust-proof scenarios such as electronic, mechanical and communication equipment. There are five types: pre-filters, medium-efficiency filters, high-efficiency filters, sub-high efficiency filters and high efficiency filters. Each type has different standards and performance.

[0003] Dust particles in the air move with the airflow through inertial motion, random Brownian motion, or under the influence of some field force. When the particles collide with other objects, the van der Waals forces between the objects cause the particles to stick to the fiber surface. Dust entering the filter medium has more opportunities to collide with the medium and will be stuck. Smaller dust particles collide with each other and stick together to form larger particles that settle. According to the patent document with publication number CN118391775A, through the setting of structures such as a secondary rotating shaft and a rotating rod, the motor starts and drives the main rotating shaft to rotate. The main rotating shaft drives the fan blades to rotate, allowing air to flow in from the air inlet pipe. The filter screen filters out the impurities contained in the air. At the same time, the active bevel gear drives the driven bevel gear to rotate, causing the secondary rotating shaft to rotate and drive the rotating rod to rotate. The driven shaft rotates along with it and rotates under the action of the rack in the gear plate, thereby rotating the cleaning brush to clean the filter screen and improve the quality of air filtration. However, considering that the cleaning brush is in continuous contact with the filter screen, the wear between the two is severe, reducing the service life of the cleaning brush. At the same time, it is required that the filtration device can intercept multiple substances in the air.

[0004] Therefore, we propose an air filter device with an impurity anti-clogging and cleaning structure. Summary of the Invention

[0005] The purpose of this invention is to provide an air filtration device with an impurity anti-clogging and cleaning structure to solve the technical defects mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an air filtration device with an impurity anti-clogging and cleaning structure, comprising a filter box, a sealing door, and an air inlet. The sealing door is rotatably connected to one side of the filter box, and air inlets are symmetrically opened on one side of the filter box. A transmission box is fixed to the bottom inner wall of the filter box by bolts. A plate frame is uniformly installed inside the filter box and at the top of the transmission box, and the plate frame is slidably connected to the inner wall of the transmission box. A polyester fiber filter element plate is placed and fixed inside the plate frame.

[0007] A fan is bolted to the top of the polyester fiber filter plate inside the filter box. A second plate frame is evenly installed on the top of the fan. The second plate frame is slidably connected to the inner wall of the filter box. A honeycomb activated carbon filter plate is fixedly placed on the inner wall of the second plate frame. Air outlet holes are evenly opened on the filter box and on the top of the honeycomb activated carbon filter plate.

[0008] Furthermore, the motor is symmetrically fixed to the inner wall of the transmission box by bolts, and a fixing ring is symmetrically fixed to the top of the transmission box, with a linkage exhaust mechanism installed inside the fixing ring.

[0009] Furthermore, the linkage exhaust mechanism includes a filter cartridge, a rotating shaft, and a sliding sleeve. The filter cartridge is fixed to the output end of the motor by spot welding. The rotating shaft is fixed to the top of the filter cartridge by spot welding. A rotating arm is symmetrically connected to the outer wall of the rotating shaft through a bearing. A sliding sleeve is slidably connected to the outer wall of the rotating shaft and located at the top of the rotating arm. A rotating connecting rod on the outer wall of the sliding sleeve is movably connected to the rotating arm. A swing arm is movably connected to one side of the rotating arm.

[0010] Furthermore, the linkage exhaust mechanism also includes a pressure ring, one side of the sliding sleeve passes through the fixing ring and is fixed with the pressure ring by spot welding, and a spring is sleeved and installed on the outer wall of the sliding sleeve and at the bottom of the pressure ring.

[0011] Furthermore, a limiting frame is fixedly connected to the inner wall of the transmission box, and limiting grooves are symmetrically opened on both sides of the limiting frame. A slide is slidably connected inside the limiting frame, and the protrusions on both sides of the outer wall of the slide engage with the limiting grooves.

[0012] Furthermore, brush cylinders are movably connected to the inner walls on both sides of the slide, and a rocker arm is rotatably connected to the top of the fixing ring via a bearing. One end of the rocker arm abuts against the bottom of the pressure ring, and the other end of the rocker arm slides and engages with the protrusion on the top of the slide.

[0013] Furthermore, a sewage discharge pump is bolted to the top of the transmission box inside the filter box. The air inlet of the sewage discharge pump is connected to the transmission box through a pipe, and the air outlet of the sewage discharge pump is connected to the filter box through a pipe. An ultraviolet lamp is installed inside the filter box and on the top of the transmission box.

[0014] This invention also proposes a method for operating an air filter device with an impurity anti-clogging and cleaning structure, as follows:

[0015] High-speed exhaust filtration utilizes the rotation of a motor to drive the filter cartridge and the internal shaft of the filter cartridge to rotate. The centrifugal force generated by the rotation of the shaft drives the swing arm to unfold, and the rotation of the swing arm generates an upward airflow. The airflow outside the filter box enters the filter cartridge through the air inlet, completing the initial filtration of the air by the filter cartridge.

[0016] The rising airflow passes through the ultraviolet lamp for sterilization and arrives at the polyester fiber filter plate on the first plate frame, where it intercepts tiny impurities in the air. The airflow is then blown by the fan onto the honeycomb activated carbon filter plate on the second plate frame, and finally discharged from the air outlet at the top of the filter box.

[0017] At low speed, the motor speed decreases and the swing arm rotates with a small lifting range. At the same time, it pulls the sliding sleeve upward, and the pressure plate moves upward, causing the rocker arm to swing. The other side of the rocker arm descends, causing the slide frame inside the limit frame to move diagonally downward, causing the brush cylinder inside the slide frame to contact the filter cartridge, thus cleaning the impurities on the surface of the filter cartridge. At the same time, the sewage air pump at the top of the transmission box is started to extract the impurities brushed off the surface of the filter cartridge.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. In this invention, the motor in the transmission box drives the filter cartridge and the rotating shaft to rotate. The rotating arm and swing arm on the rotating shaft unfold and generate an upward airflow, causing the air outside the filter box to pass through the air inlet and the filter cartridge to complete the initial impurity filtration. As the filter cartridge works for a long time, the amount of impurities adhering to the surface increases, affecting the normal air intake of the filter box. At this time, the original motor speed is adjusted to actively reduce the motor speed, causing the swing arm to float lower. Correspondingly, the height of the sliding sleeve on the rotating shaft increases, and the pressure ring on the fixed ring increases, causing the height of the rocker arm to abut against the pressure ring to rise. The height of the slide frame in the limit frame decreases, and the brush tube on the slide frame contacts the surface of the filter cartridge, realizing automatic brushing during the rotation of the filter cartridge. The impurities brushed off are uniformly extracted from the filter box by the sewage pump. The surface cleaning of the filter cartridge is automatically completed by adjusting the motor speed. The subsequent increase in motor speed causes the brush tube to disengage from the filter cartridge surface to avoid affecting the overall service life of the brush tube due to prolonged contact with the filter cartridge.

[0020] 2. In this invention, by installing filter cartridges, ultraviolet lamps, polyester fiber filter plates, and honeycomb activated carbon filter plates from bottom to top in the filter box, impurities and bacteria in the air are intercepted and removed respectively, ensuring complete air purification. At the same time, pull-out plate frames one and two are provided in the filter box to facilitate quick replacement of honeycomb activated carbon filter plates and polyester fiber filter plates, making the air filtration device with impurity anti-clogging and cleaning structure more convenient to use. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the unfolded structure of the filter box inner plate frame one and plate frame two of the present invention;

[0022] Figure 2 This is a schematic diagram of the unfolded sealing door of the air filter device with impurity anti-clogging and cleaning structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the main cross-sectional structure of the filter box of the present invention;

[0024] Figure 4 This is a schematic diagram of the connection structure between the linkage exhaust mechanism and the limiting frame inside the transmission box of the present invention;

[0025] Figure 5 This is a schematic diagram of the overall structure of the linkage exhaust mechanism of the present invention;

[0026] Figure 6 This is a schematic diagram of the sliding frame installation structure of the present invention.

[0027] In the diagram: 1. Filter box; 2. Sealed door; 3. Transmission box; 4. Plate frame one; 5. Polyester fiber filter element plate; 6. Fan; 7. Plate frame two; 8. Honeycomb activated carbon filter element plate; 9. Air outlet; 10. Fixing ring; 11. Motor; 12. Linked exhaust mechanism; 121. Filter cartridge; 122. Rotating shaft; 123. Rotating arm; 124. Sliding sleeve; 125. Pressure ring; 126. Swing arm; 13. Spring; 14. Limiting frame; 15. Limiting groove; 16. Slide frame; 17. Brush cylinder; 18. Rocker arm; 19. Sewage pump; 20. Ultraviolet lamp; 21. Air inlet. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 1-6 The present invention provides a technical solution:

[0030] Example 1: Considering the need to clean the surface of the filter screen on the air filter device, the usual method is disassembly and cleaning. Therefore, as follows... Figure 2 As shown, a linkage exhaust mechanism 12 is symmetrically arranged on the transmission box 3 installed at the bottom of the filter box 1. Through the rotation of the filter cartridge 121 and the rotating shaft 122, the filter box 1 completes the self-priming air intake. At the same time, the speed of the motor 11 is changed, and the surface of the filter cartridge 121 is automatically cleaned in sync, so as to avoid the problem of reduced gas flow rate caused by impurities clogging the mesh of the filter cartridge 121 after long-term operation.

[0031] Specifically, such as Figure 4 and Figure 5 As shown, motors 11 are symmetrically installed inside transmission box 3. Motors 11 drive filter cartridge 121 and the rotating shaft 122 on filter cartridge 121 to rotate. At the same time, the top of filter cartridge 121 abuts against the fixed ring 10 fixedly installed on transmission box 3 to achieve stable rotation of filter cartridge 121.

[0032] Motor 11 drives filter cartridge 121 to rotate on the side of transmission box 3 and at air inlet 21 on filter box 1. Rotating arm 123 on the outer wall of rotating shaft 122 rotates, and swing arm 126 movably connected on rotating arm 123 unfolds. A counterweight ball is set at the front end of swing arm 126. At the same time, the special fan blade shape of swing arm 126 can generate an upward airflow when it rotates and unfolds. As rotating arm 123 and swing arm 126 unfold, the height of the connection point between them decreases. Correspondingly, one side of sliding sleeve 124 on rotating shaft 122 is movably connected to rotating arm 123, so that sliding sleeve 124 moves downward synchronously when swing arm 126 unfolds.

[0033] One side of the rotating sleeve is fitted with a pressure ring 125 on the outer sleeve of the fixed ring 10. A spring 13 is also fitted between the pressure ring 125 and the fixed ring 10. The spring 13 abuts against the pressure ring 125. The higher the speed of the motor 11, the greater the downward distance of the sliding sleeve 124 on the rotating shaft 122. A rocker arm 18 is rotatably connected to the fixed ring 10. One end of the rocker arm 18 abuts against the bottom of the pressure ring 125. When the pressure ring 125 moves downward, it presses down the rocker arm 18 simultaneously, so that the right side of the rocker arm 18 is lower than the left side.

[0034] like Figure 4 As shown, a limit frame 14 is also fixed inside the transmission box 3. Limit grooves 15 are symmetrically formed on both sides of the limit frame 14. Figure 6 As shown, a slide 16 is slidably connected within the limiting frame 14. The protrusions on both sides of the slide 16 abut against the limiting groove 15. When the rocker arm 18 is held to be lower on the right and higher on the left, the left side of the rocker arm 18 lifts and pulls the slide 16 within the limiting frame 14 upward. The inclined surface of the limiting groove 15 causes the slide 16 to slide synchronously to the upper left. The brush cylinder 17, which is movably disposed within the slide 16, disengages from contact with the surface of the filter cartridge 121. At this time, the motor 11 rotates at high speed, driving the swing arm 126 to unfold and perform air delivery. As the filtration time of the filter cartridge 121 increases, the amount of impurities intercepted on its surface increases, and then the filter cartridge 121 is cleaned.

[0035] As the speed of motor 11 decreases, spring 13 pushes pressure ring 125 upward to move, and at the same time, swing arm 126 rotates and the lifting angle decreases. At this time, rocker arm 18 changes from left high and right low to left low and right high. Slide 16, located in limit frame 14, moves diagonally downward when rocker arm 18 is not lifting. Brush cylinder 17, located in slide 16, begins to contact the surface of filter cartridge 121. The slowly rotating filter cartridge 121 contacts brush cylinder 17, and brush cylinder 17 completes the cleaning of the surface of filter cartridge 121. At the same time, the impurities adsorbed on brush cylinder 17 will also be intercepted by the comb groove on the side of slide 16, thereby discharging the impurities on filter cartridge 121 into transmission box 3.

[0036] The surface of the filter cartridge 121 is cleaned by reducing the speed of the motor 11. As the speed of the motor 11 is reduced, the rotation amplitude of the swing arm 126 is reduced, and the upward airflow is reduced. This prevents the impurities brushed off by the brush cylinder 17 from being re-adsorbed on the surface of the filter cartridge 121, thus avoiding secondary pollution of the filter cartridge 121. At the same time, it accelerates the removal efficiency of impurities on the filter cartridge 121. Meanwhile, the indirect contact of the brush cylinder 17 with the filter cartridge 121, compared with continuous contact, results in severe wear of the brush bristles on the surface of the brush cylinder 17 and a significant reduction in service life. Compared with the fixed setting of the filter cartridge 121, the centrifugal force generated by the daily rotation of the filter cartridge 121 will also throw out impurities, realizing the self-cleaning of the filter cartridge 121 during operation.

[0037] Considering the continuous increase in the amount of impurities inside transmission box 3, such as Figure 2 As shown, a sewage discharge air pump 19 is fixed to the top of the transmission box 3 by bolts. The air inlet of the sewage discharge air pump 19 is connected to the transmission box 3. By working, the sewage discharge air pump 19 continuously transfers impurities in the transmission box 3, ensuring that the filter cartridge 121 works in a clean environment.

[0038] Example 2: Considering the limited filtration capacity of filter cartridge 121, other minute impurities in the air will still pass through filter cartridge 121 and reach the middle of filter box 1, such as... Figure 2 As shown, plate frames 1 4 are evenly installed inside the filter box 1 and on top of the transmission box 3. The drawer-type design of plate frames 1 4 makes it convenient for operators to open the sealed door 2 on the filter box 1 to replace the polyester fiber filter element plate 5. Plate frames 2 7 are the same as plate frames 1 4 and can be pulled out.

[0039] like Figure 1 As shown, the multi-segment installation of the polyester fiber filter plate 5 located in the frame 4 intercepts tiny impurities in the air. At the same time, the ultraviolet lamp 20 installed in the filter box 1 at the bottom of the polyester fiber filter plate 5 can treat germs in the air, ensuring complete air purification.

[0040] To accelerate airflow in the upper section of filter box 1, a fan 6 is installed inside filter box 1 and on top of polyester fiber filter plate 5. The fan 6 rotates to move the air filtered by polyester fiber filter plate 5, accelerating the flow rate of purified air in the upper section of filter box 1. A multi-section plate frame 7 is installed on top of the fan 6. A honeycomb activated carbon filter plate 8 is installed and fixed inside the plate frame 7. The honeycomb activated carbon has the characteristics of large specific surface area, low pore resistance, well-developed micropores, high adsorption capacity and long service life. It can remove acid and alkaline gases such as nitrogen oxides, carbon tetrachloride, chlorine, benzene, formaldehyde, acetone, ethanol, ether, methanol, acetic acid, ethyl acetate, styrene, phosgene and malodorous gases from the air, further improving the air purification effect.

[0041] Finally, the air discharged from the honeycomb activated carbon filter plate 8 in the filter box 1 completes the final filtration work and is discharged through the air outlet 9 on the filter box 1. The set plate frame 1 4 and plate frame 2 7 facilitate the replacement of the relevant polyester fiber filter plate 5 and honeycomb activated carbon filter plate 8 in the filter box 1. At the same time, the installation of honeycomb activated carbon filter plate 8 and polyester fiber filter plate 5 expands the processing range of the air filtration device with impurity anti-clogging and cleaning structure, thereby further improving the air purification effect.

[0042] The working principle of this invention is as follows: The motor 11 rotates to drive the filter cartridge 121 and the rotating shaft 122 inside the filter cartridge 121 to rotate. The centrifugal force generated by the rotation of the rotating shaft 122 drives the swing arm 126 to unfold. The rotation of the swing arm 126 generates an upward airflow. The airflow outside the filter box 1 enters the filter cartridge 121 through the air inlet 21, completing the initial filtration of air by the filter cartridge 121.

[0043] The rising airflow passes through the ultraviolet lamp 20 for sterilization and arrives at the polyester fiber filter plate 5 on the first plate frame 4, where it intercepts tiny impurities in the air. It is then blown by the fan 6 onto the honeycomb activated carbon filter plate 8 on the second plate frame 7 and then discharged from the air outlet 9 at the top of the filter box 1.

[0044] The speed of motor 11 decreases, the swing arm 126 rotates and lifts slightly, and at the same time pulls the sliding sleeve 124 to move upward. The pressure plate moves upward, causing the rocker arm 18 to swing. The other side of the rocker arm 18 descends, causing the slide 16 inside the limit frame 14 to move diagonally downward. This causes the brush cylinder 17 inside the slide 16 to contact the filter cartridge 121. As the filter cartridge 121 rotates and the brush cylinder 17 contacts it, the impurities on the surface of the filter cartridge 121 are cleaned. At the same time, the sewage discharge air pump 19 at the top of the transmission box 3 is started to extract the impurities brushed off the surface of the filter cartridge 121.

[0045] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0046] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. Air filter device with impurity anti-blocking cleaning structure, comprising a filter box (1), a sealing door (2) and an air inlet (21), the side of the filter box (1) is rotatably connected with the sealing door (2), the side of the filter box (1) is symmetrically provided with the air inlet (21), characterized in that, The bottom inner wall of the filter box (1) is fixed with a transmission box (3) through bolts, the filter box (1) is uniformly provided with a plate frame one (4) on the top of the transmission box (3), and the plate frame one (4) is in sliding connection with the inner wall of the transmission box (3), and the plate frame one (4) is fixedly placed with a polyester fiber filter core plate (5) inside. The top of the polyester fiber filter core plate (5) in the filter box (1) is fixed with a fan (6) through bolts, the top of the fan (6) is uniformly provided with a plate frame two (7), the plate frame two (7) is in sliding connection with the inner wall of the filter box (1), and the inner wall of the plate frame two (7) is fixedly placed with a honeycomb activated carbon filter core plate (8). The inner wall of the transmission box (3) is fixedly provided with a motor (11) through bolts, and the top of the transmission box (3) is fixedly provided with a fixed ring (10), and the fixed ring (10) is provided with a linkage exhaust mechanism (12). The linkage exhaust mechanism (12) comprises a filter cylinder (121), a rotating shaft (122) and a sliding sleeve (124), the output end of the motor (11) is fixed with the filter cylinder (121) through spot welding, the top of the filter cylinder (121) is fixed with the rotating shaft (122) through spot welding, the outer wall of the rotating shaft (122) is rotatably connected with a rotating arm (123) through bearings, and the outer wall of the rotating shaft (122) and the top of the rotating arm (123) are sleeved with the sliding sleeve (124) in sliding connection, the outer wall of the sliding sleeve (124) is rotatably connected with the rotating arm (123), and the rotating arm (123) is movably connected with a swing arm (126). The linkage exhaust mechanism (12) further comprises a pressing ring (125), one side of the sliding sleeve (124) penetrates through the fixed ring (10) and is fixed with the pressing ring (125) through spot welding, and the outer wall of the sliding sleeve (124) and the bottom of the pressing ring (125) are sleeved with the spring (13).

2. The air filter device with the impurity blocking and cleaning structure according to claim 1, characterized in that, The inner wall of the transmission box (3) is fixedly connected with a limiting frame (14), limiting grooves (15) are symmetrically formed on the two sides of the limiting frame (14), the limiting frame (14) is in sliding connection with a sliding frame (16) inside, and the two side outer walls of the sliding frame (16) are protruded and clamped with the limiting grooves (15).

3. The air filter device with the impurity blocking and cleaning structure according to claim 2, characterized in that, The two side inner walls of the sliding frame (16) are movably connected with brush barrels (17), the top of the fixed ring (10) is rotatably connected with a lever (18) through a bearing, one end of the lever (18) abuts against the bottom of the pressing ring (125), and the other end of the lever (18) is slidably clamped with the top protrusion of the sliding frame (16).

4. The air filter device with the impurity blocking and cleaning structure according to claim 1, characterized in that, The top of the transmission box (3) is fixedly provided with a blow-off gas pump (19) in the filter box (1), the gas inlet end of the blow-off gas pump (19) is communicated with the transmission box (3) through a pipeline, the gas outlet end of the blow-off gas pump (19) is communicated with the filter box (1) through a pipeline, and the top of the transmission box (3) is provided with an ultraviolet lamp (20) in the filter box (1).

5. The method of operating an air filter device with a foreign matter blocking cleaning structure according to any one of claims 1 to 4, wherein, The specific mode is as follows: High speed exhaust filter, the motor (11) rotates to drive the filter cylinder (121) and the rotating shaft (122) in the filter cylinder (121), the centrifugal force generated by the rotating shaft (122) drives the swing arm (126) to expand, the swing arm (126) rotates to generate upward flowing air flow, the air flow outside the filter box (1) enters the filter cylinder (121) through the air inlet (21), and the preliminary filtration of the filter cylinder (121) to the air is completed; The rising air flow is sterilized by the ultraviolet lamp (20), comes to the polyester fiber filter core plate (5) on the plate frame one (4), intercepts small impurities in the air, and is blown to the honeycomb active carbon filter core plate (8) on the plate frame two (7) through the rotation of the fan (6), and then is discharged from the air outlet (9) at the top of the filter box (1); Low speed suction and impurity removal, the motor (11) reduces the rotating speed, the swing arm (126) rotates with small lifting amplitude, simultaneously pulls the sliding sleeve (124) to move upward, the pressing plate moves upward to cause the rocker (18) to swing, the other side of the rocker (18) descends to make the sliding frame (16) in the limiting frame (14) move to the obliquely downward, causes the brush cylinder (17) in the sliding frame (16) to contact the filter cylinder (121), completes the cleaning of the impurities on the surface of the filter cylinder (121), simultaneously starts the dirt discharge pump (19) at the top of the transmission box (3), and the impurities brushed off from the surface of the filter cylinder (121) are extracted.

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