Filter screen cleaning device

Abstract

The utility model relates to the technical field of filter screen cleaning, in particular to a filter screen cleaning device. The filter screen cleaning device comprises a central pipe, a guide frame and a cleaning frame, the axial first end of the central pipe can be communicated with the water supply pipe, and the axial second end of the central pipe is closed. And the guide frame is arranged on the central pipe and is supported on the inner wall of the filter screen. The water supply pipe is configured to pull the center pipe to move in the axial direction of the filter screen, and the guide frame slides along the inner wall of the filter screen. The cleaning frame comprises a sleeve and a cleaning pipe extending in the radial direction of the sleeve, the sleeve is arranged on the central pipe in a sleeving mode, one end of the cleaning pipe is connected with the sleeve, and the central pipe is communicated with the cleaning pipe through the sleeve. The other end of the cleaning pipe communicates with a flushing head, a water outlet facing the circumferential direction of the sleeve is formed in the periphery of the cleaning pipe, and water flow sprayed out of the water outlet drives the sleeve to rotate in the axial direction of the center pipe. The filter screen does not need to be dismounted from the conveying pipe, dismounting operation of the filter screen is omitted, cleaning of the filter screen under the condition that a core is not pulled is achieved, and the cleaning efficiency of the filter screen is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of filter screen cleaning, in particular to a filter screen cleaning device. Background Art

[0002] In the medium delivery pipe, it is usually necessary to install a filter to filter out foreign matter and impurities that may be present in the medium. After long-term use, the filter needs to be cleaned to prevent clogging.

[0003] Currently, the conventional filter cleaning method involves extracting the filter from the pipeline (a process also known as core extraction), moving it to a cleaning area, flushing it with water, and then reinstalling it into the delivery pipe. This filter cleaning method requires disassembly and assembly, which is complex and inefficient. Furthermore, when the filter is heavy, the delivery pipe is located high, or the space for disassembly and assembly is limited, the difficulty of disassembly and assembly increases, reducing the cleaning efficiency of the filter. Utility Model Content

[0004] The utility model aims to provide a filter screen cleaning device, which can clean the filter screen without pulling out the core, thereby improving the cleaning efficiency of the filter screen.

[0005] To achieve this purpose, the technical solution adopted in this utility model is:

[0006] A filter screen cleaning device is used to clean a cylindrical filter screen; the filter screen cleaning device comprises:

[0007] a central tube, wherein a first axial end of the central tube is communicable with the water supply pipe and a second axial end of the central tube is closed;

[0008] a guide frame, disposed on the central tube and supported on the inner wall of the filter screen; the water supply pipe is configured to pull the central tube to move axially along the filter screen, and the guide frame slides along the inner wall of the filter screen;

[0009] The cleaning rack includes a sleeve and a cleaning pipe extending radially along the sleeve, the sleeve is sleeved on the central tube, one end of the cleaning pipe is connected to the sleeve, and the central tube is connected to the cleaning pipe through the sleeve; the other end of the cleaning pipe is connected and a flushing head is installed, and a water outlet facing the circumference of the sleeve is opened on the outer periphery of the cleaning pipe, and the water flow sprayed from the water outlet drives the sleeve to rotate around the axial direction of the central tube.

[0010] As an optional solution, the cleaning rack further comprises a nozzle, one end of the nozzle is connected and installed at the water outlet, and the other end of the nozzle is provided with a flared opening facing the circumference of the sleeve.

[0011] As an optional solution, at least two cleaning pipes are arranged on the sleeve at equal intervals along the circumferential direction, the nozzles on at least two cleaning pipes are located on the same virtual circle, and the axial direction of the flared port is parallel to the tangent direction of the virtual circle.

[0012] As an optional solution, the filter cleaning device also includes a mechanical sealing assembly, the central tube is provided with a cache groove along the circumferential direction, the mechanical sealing assembly is sealedly installed at both ends of the cache groove along the axial direction of the central tube, the static ring of the mechanical sealing assembly is sealed to the side wall of the cache groove, the sleeve is sleeved in the cache groove and the sealing clamp is arranged on the two dynamic rings of the mechanical sealing assembly.

[0013] As an optional solution, the cache groove, the two moving rings and the inner wall of the sleeve form a cache cavity, and the central tube is connected to the sleeve through the cache cavity.

[0014] As an optional solution, the guide frame includes:

[0015] A shaft sleeve, sleeved on the central tube;

[0016] Support arms, the shaft sleeve is provided with at least two support arms at intervals along the circumferential direction, and one end of the support arm away from the shaft sleeve is supported on the inner wall of the filter screen.

[0017] As an optional solution, a rolling body is rotatably mounted on one end of the support arm away from the sleeve, and the rolling body is supported on the inner wall of the filter screen; when the central tube moves axially along the filter screen, the rolling body slides along the inner wall of the filter screen.

[0018] As an optional solution, the rolling body is a roller, and the end of the support arm away from the sleeve is pivotally connected to the roller.

[0019] As an optional solution, a support plate is provided at the second axial end of the central tube, and a scraper is provided on the support plate, wherein the circumferential edge of the scraper elastically presses against the inner wall of the filter screen.

[0020] As an optional solution, the scraper is a rubber ring plate, and the outer ring of the rubber ring plate elastically presses against the inner wall of the filter screen.

[0021] The beneficial effects of the utility model are:

[0022] The filter cleaning device proposed in the present invention has a water supply pipe that supplies water to the cleaning pipe of the cleaning rack through a central pipe. A portion of the water in the cleaning pipe is sprayed onto the inner wall of the filter through a flushing head, and the other portion of the water is sprayed out through a water outlet. The water spraying power at the water outlet drives the cleaning rack to rotate about the axis of the central pipe, thereby flushing foreign matter and impurities from the inner wall of the filter through the rotating flushing head. At the same time, the central pipe is pulled along the axial direction of the filter by the water supply pipe, and the guide rack slides along the inner wall of the filter, so that the flushing head moves from one axial end of the filter to the other axial end of the filter, thereby completing the cleaning operation of the inner wall of the filter. The filter cleaning device of this embodiment directly extends into the interior of the filter, and then is pulled axially within the filter by the water supply pipe to complete the cleaning of the inner wall of the filter. There is no need to remove the filter from the delivery pipe, which saves the disassembly and assembly operations during filter cleaning, and achieves the cleaning of the filter without core extraction, thereby improving the cleaning efficiency of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of the filter cleaning device provided by an embodiment of the present utility model when cleaning the filter;

[0024] Figure 2 This is a schematic structural diagram of the filter screen cleaning device provided by the embodiment of the present invention when cleaning the filter screen without the delivery pipe;

[0025] Figure 3 This is a schematic structural diagram of a filter cleaning device provided by an embodiment of the present utility model;

[0026] Figure 4 It is a partial cross-sectional view of the filter cleaning device provided by an embodiment of the present utility model.

[0027] The names and numbers of the components in the figure are as follows:

[0028] 10. Delivery pipe; 20. Filter;

[0029] 1. Center tube; 11. Buffer tank; 2. Guide frame; 21. Bushing; 22. Support arm; 23. Rolling element; 3. Cleaning frame; 31. Sleeve; 32. Cleaning pipe; 33. Flushing head; 34. Nozzle; 340. Flaring; 4. Mechanical seal assembly; 41. Moving ring; 42. Stationary ring; 5. Support plate; 6. Scraper. DETAILED DESCRIPTION

[0030] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention more clearly understood, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of it.

[0031] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0034] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0035] like Figure 1 As shown, in the medium delivery pipe 10, the filter screen 20 is installed in the delivery pipe 10 in a cylindrical shape. The medium is usually water, flowing chemical solution or preparation. Figure 1 The direction indicated by the middle arrow flows from the inlet end of the delivery pipe 10 into the filter screen 20, is filtered through the mesh of the filter screen 20, and then flows out from the outlet of the delivery pipe 10 to intercept foreign matter and impurities that may exist in the medium through the filter screen 20.

[0036] After the filter 20 has been used for a certain period of time or becomes clogged, it is removed from the pipeline (a process also known as core extraction), then moved to a cleaning area to be rinsed with water, and finally, the cleaned filter 20 is reinstalled into the delivery pipe 10. The above-mentioned cleaning method for the filter 20 requires disassembly and assembly of the filter 20, which is complicated and has low cleaning efficiency. Moreover, when the filter 20 is heavy, the delivery pipe 10 is located at a high position, or the disassembly and assembly space in the delivery pipe 10 is limited, the difficulty of disassembly and assembly of the filter 20 is further increased, thereby reducing the cleaning efficiency of the filter 20.

[0037] To solve the above problems, Figure 2 and Figure 3 As shown, this embodiment provides a filter screen cleaning device for cleaning a cylindrical filter screen 20. The filter screen cleaning device includes a central tube 1, a guide frame 2, and a cleaning frame 3. The central tube 1 has a first axial end that is connected to a water supply pipe, and a second axial end that is closed. The guide frame 2 is disposed on the central tube 1 and supported on the inner wall of the filter screen 20. The water supply pipe is configured to pull the central tube 1 axially along the filter screen 20, and the guide frame 2 slides along the inner wall of the filter screen 20. The cleaning frame 3 includes a sleeve 31 and a cleaning pipe 32 extending radially along the sleeve 31. The sleeve 31 is sleeved on the central tube 1. One end of the cleaning pipe 32 is connected to the sleeve 31, and the central tube 1 is connected to the cleaning pipe 32 through the sleeve 31. The other end of the cleaning pipe 32 is connected to a flushing head 33. The outer periphery of the cleaning pipe 32 is provided with a water outlet facing the circumference of the sleeve 31. The water ejected from the outlet drives the sleeve 31 to rotate about the axial direction of the central tube 1.

[0038] In this embodiment, a water supply pipe supplies water to the cleaning pipe 32 of the cleaning rack 3 through the central pipe 1. A portion of the water in the cleaning pipe 32 is sprayed onto the inner wall of the filter 20 through the flushing head 33, and the remaining portion of the water is ejected through the water outlet. The water jetting force at the water outlet drives the cleaning rack 3 to rotate about the axial direction of the central pipe 1, thereby flushing foreign matter and impurities from the inner wall of the filter 20 through the rotating flushing head 33. At the same time, the central pipe 1 is pulled along the axial direction of the filter 20 by the water supply pipe, and the guide rack 2 slides along the inner wall of the filter 20, causing the flushing head 33 to move from one axial end of the filter 20 to the other axial end of the filter 20, thereby completing the cleaning operation of the inner wall of the filter 20. The filter cleaning device of this embodiment directly extends into the interior of the filter 20, and then is pulled by the water supply pipe to move the filter cleaning device axially in the filter 20 to complete the cleaning of the inner wall of the filter 20. There is no need to remove the filter 20 from the delivery pipe 10, which saves the disassembly and assembly operations when cleaning the filter 20, realizes the cleaning of the filter 20 without core extraction, and improves the cleaning efficiency of the filter 20.

[0039] Specifically, the first end of the central tube 1 is threadedly connected to the external water supply pipe to ensure the stability and sealing of the connection between the central tube 1 and the water supply pipe, improve the disassembly and assembly efficiency of the central tube 1 and the water supply pipe, and avoid water leakage during the water supply process.

[0040] like Figure 2 and Figure 3 As shown, the guide frame 2 includes a sleeve 21 and support arms 22. The sleeve 21 is mounted on the center tube 1. The sleeve 21 is provided with at least two support arms 22 spaced circumferentially. The end of the support arm 22, distal from the sleeve 21, supports the inner wall of the filter screen 20. Specifically, the sleeve 21 is threaded onto the center tube 1 to ensure a secure mounting of the sleeve 21 and the center tube 1. The support arms 22 extend radially along the sleeve 21, ensuring that the filter screen 20, the center tube 1, and the sleeve 21 are coaxially arranged. The guide frame 2 is supported on the inner wall of the filter screen 20 by at least two support arms 22, providing at least two support points on the inner wall of the filter screen 20. This improves the stability of the guide frame 2's support of the center tube 1, prevents the center tube 1 from tilting or eccentricity during axial movement along the filter screen 20, and ensures the coaxiality of the center tube 1 and the filter screen 20.

[0041] Specifically, the present embodiment has four support arms 22, and four support arms 22 are evenly spaced around the outer circumference of the sleeve 21, so that the four support arms 22 form a cross-shaped structure, and the guide frame 2 has four support points on the inner wall of the filter 20, thereby improving the stability of the guide frame 2. In other embodiments, the number of support arms 22 may be three or more, which is not specifically limited here. In other embodiments, the support arm 22 may be set as a telescopic arm, and the length of the support arm 22 may be adaptively adjusted according to the inner diameter of the filter 20 to ensure that the support arm 22 is suitable for filter screens 20 with different inner diameters, thereby improving the versatility of the filter cleaning device. Since the telescopic structure of the telescopic arm is a prior art, the telescopic structure of the support arm 22 will not be described in detail.

[0042] Furthermore, a rolling element 23 is rotatably mounted on the end of the support arm 22 away from the sleeve 21. Rolling element 23 is supported on the inner wall of the filter screen 20. When the central tube 1 moves axially along the filter screen 20, rolling element 23 slides along the inner wall of the filter screen 20. The rolling friction between rolling element 23 and the inner wall of the filter screen 20 reduces the friction between the support arm 22 and the filter screen 20, reduces the pulling resistance of the water supply pipe, facilitates the filter screen cleaning device to quickly clean the filter screen 20, and improves cleaning efficiency.

[0043] In this embodiment, the rolling element 23 is a roller, pivotally connected to the end of the support arm 22 away from the sleeve 21. The end of the support arm 22 away from the sleeve 21 (i.e., the end closer to the inner wall of the filter screen 20) has a receiving groove. The roller is pivotally mounted within the receiving groove, with the roller surface abutting the inner wall of the filter screen 20. The roller allows the guide frame 2 to slide along the inner wall of the filter screen 20, ensuring smooth sliding of the guide frame 2. In other embodiments, the rolling element 23 can also be a sphere, etc.

[0044] like Figure 3 and Figure 4 As shown, the filter screen cleaning device also includes a mechanical seal assembly 4. The central tube 1 is provided with a buffer groove 11 along the circumference. Mechanical seal assemblies 4 are sealed and installed at both ends of the buffer groove 11 along the axial direction of the central tube 1. The static ring 42 of the mechanical seal assembly 4 is sealed and connected to the side wall of the buffer groove 11. The sleeve 31 is sleeved in the buffer groove 11 and is sealed and clamped on the two dynamic rings 41 of the mechanical seal assemblies 4. The sleeve 31 is rotatably mounted on the central tube 1 through the two mechanical seal assemblies 4. A static seal is maintained between the static ring 42 and the central shaft, a dynamic seal is maintained between the dynamic ring 41 and the static ring 42, and a dynamic seal is maintained between the dynamic ring 41 and the sleeve 31, thereby ensuring the sealing effect between the sleeve 31 and the central tube 1 and avoiding water leakage at the sleeve 31.

[0045] It should be noted that the above-mentioned mechanical seal assembly 4 includes a dynamic ring 41 (dynamic sealing ring), a static ring 42 (static sealing ring), an auxiliary seal (sealing ring), a clamping member (spring or push ring) and a transmission member (spring seat and key or fixing screw) and other components. Since the mechanical seal assembly 4 is a prior art, the specific structure of the mechanical seal assembly 4 will not be repeated.

[0046] like Figure 4 As shown, the cache groove 11, the two dynamic rings 41 and the inner wall of the sleeve 31 form a cache cavity, and the central tube 1 is connected to the sleeve 31 through the cache cavity. Specifically, a first water-permeable hole connected to the cache cavity is opened in the tube wall of the central tube 1, and the water inside the central tube 1 enters the cache cavity through the first water-permeable hole. A plurality of second water-permeable holes connected to the cache cavity are opened circumferentially in the sleeve 31. One end of each second water-permeable hole is connected to the cache cavity, and the other end of each second water-permeable hole is connected to the interior of the cleaning pipe 32 in a one-to-one correspondence. After the water from the water supply pipe passes through the central tube 1, the first water-permeable hole, the cache cavity, the second water-permeable hole and the cleaning pipe 32 in sequence, a part of the water is sprayed onto the inner wall of the filter 20 through the flushing head 33, and the other part of the water is sprayed out through the water outlet. The water spraying power at the water outlet is used to drive the cleaning rack 3 to rotate around the axial direction of the central tube 1.

[0047] Furthermore, if Figure 3As shown, the cleaning rack 3 further includes a nozzle 34, one end of which is connected to and mounted at the water outlet, and the other end of the nozzle 34 is provided with a flared opening 340 circumferentially facing the sleeve 31. Water at the water outlet is ejected through the flared opening 340, causing the water pressure at the nozzle 34 to drop and the kinetic energy to increase. This converts more of the water pressure at the water outlet into kinetic energy that drives the cleaning rack 3 to rotate, increasing the rotation speed of the cleaning rack 3 and thereby improving the cleaning effect on the filter 20.

[0048] Specifically, at least two cleaning tubes 32 are circumferentially spaced evenly apart from each other. The nozzles 34 on at least two cleaning tubes 32 are located on the same virtual circle, with the axial direction of the flared openings 340 parallel to the tangent of the virtual circle. The even spacing of the cleaning tubes 32 ensures dynamic balance during the rotation of the cleaning rack 3, preventing shaking or positional shifting, and improving the stability of the cleaning rack 3. Furthermore, the direction of the water sprayed from each nozzle 34 is parallel to the tangent of the virtual circle, ensuring that the driving force provided by each nozzle 34 is parallel to the tangent of the virtual circle, thus ensuring stable rotation of the cleaning tubes 32.

[0049] In this embodiment, five cleaning pipes 32 are evenly spaced along the circumference of the sleeve 31, and the five nozzles 34 are located on the same virtual circle. Multiple cleaning pipes 32 clean the inner wall of the filter screen 20, improving the cleaning effect. In other embodiments, the number of cleaning pipes 32 can also be two, three, four, or more than six.

[0050] like Figure 3 As shown, a support plate 5 is provided at the second axial end of the central tube 1, on which a scraper 6 is provided. The circumferential edge of the scraper 6 elastically presses against the inner wall of the filter screen 20. The support plate 5 abuts the inner wall of the filter screen 20 via the scraper 6, so that the support plate 5 (scraper 6) and the guide frame 2 jointly support the central tube 1 and the cleaning frame 3, ensuring stable axial movement of the filter screen cleaning device within the filter screen 20. At the same time, when the scraper 6 moves axially within the filter screen 20, it can also scrape away foreign matter and impurities remaining on the inner wall of the filter screen 20, achieving secondary cleaning and decontamination, thereby improving the cleaning effect of the filter screen 20.

[0051] Furthermore, the scraper 6 is a rubber ring plate, the outer ring of which elastically presses against the inner wall of the filter screen 20. Specifically, the scraper 6 is a flexible plate, allowing it to elastically deform, preventing scratching of the filter screen 20. At the same time, it allows the scraper 6 to tightly press against the inner wall of the filter screen 20, improving the scraping ability of the scraper 6 and ensuring a secondary cleaning and decontamination effect. The scraper 6 of this embodiment is screwed to the support plate 5, enabling detachable installation of the scraper 6 and facilitating its removal and replacement.

[0052] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications are possible without departing from the spirit and scope of the present invention. Such changes and modifications are within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. Filter cleaning device, characterized in that, Used for cleaning a cylindrical filter screen (20); the filter screen cleaning device comprises: A central tube (1), wherein a first axial end of the central tube (1) is capable of communicating with a water supply pipe, and a second axial end of the central tube (1) is closed; a guide frame (2) disposed on the central tube (1) and supported on the inner wall of the filter screen (20); the water supply pipe is configured to pull the central tube (1) to move axially along the filter screen (20), and the guide frame (2) slides along the inner wall of the filter screen (20); A cleaning rack (3) is provided, comprising a sleeve (31) and a cleaning pipe (32) extending radially along the sleeve (31); the sleeve (31) is sleeved on the central tube (1); one end of the cleaning pipe (32) is connected to the sleeve (31); the central tube (1) is communicated with the cleaning pipe (32) through the sleeve (31); the other end of the cleaning pipe (32) is connected to a flushing head (33); a water outlet facing the circumference of the sleeve (31) is provided on the outer periphery of the cleaning pipe (32); the water flow ejected from the water outlet drives the sleeve (31) to rotate around the axial direction of the central tube (1).

2. The filter screen cleaning device according to claim 1, characterized in that: The cleaning rack (3) further comprises a nozzle (34), one end of which is connected and installed at the water outlet, and the other end of which is provided with a flared opening (340) facing the circumference of the sleeve (31).

3. The filter screen cleaning device according to claim 2, characterized in that: The sleeve (31) is provided with at least two cleaning pipes (32) at equal intervals along the circumferential direction, the nozzles (34) on at least two cleaning pipes (32) are located on the same virtual circle, and the axial direction of the flared opening (340) is parallel to the tangent direction of the virtual circle.

4. The filter screen cleaning device according to claim 1, characterized in that: The filter screen cleaning device also includes a mechanical seal assembly (4), the central tube (1) is provided with a buffer groove (11) along the circumferential direction, and the mechanical seal assembly (4) is sealed and installed at both ends of the buffer groove (11) along the axial direction of the central tube (1), and the static ring (42) of the mechanical seal assembly (4) is sealed and connected to the side wall of the buffer groove (11), and the sleeve (31) is sleeved in the buffer groove (11) and is sealed and clamped on the two dynamic rings (41) of the mechanical seal assembly (4).

5. The filter screen cleaning device according to claim 4, characterized in that: The cache groove (11), the two movable rings (41) and the inner wall of the sleeve (31) form a cache cavity, and the central tube (1) is connected to the sleeve (31) through the cache cavity.

6. The filter screen cleaning device according to any one of claims 1 to 5, characterized in that: The guide frame (2) comprises: A shaft sleeve (21) is sleeved on the central tube (1); Support arms (22), the shaft sleeve (21) is provided with at least two support arms (22) spaced apart along the circumferential direction, and one end of the support arm (22) away from the shaft sleeve (21) is supported on the inner wall of the filter screen (20).

7. The filter screen cleaning device according to claim 6, characterized in that: A rolling body (23) is rotatably mounted on one end of the support arm (22) away from the shaft sleeve (21), and the rolling body (23) is supported on the inner wall of the filter screen (20); when the central tube (1) moves along the axial direction of the filter screen (20), the rolling body (23) slides along the inner wall of the filter screen (20).

8. The filter screen cleaning device according to claim 7, characterized in that: The rolling body (23) is a roller, and one end of the support arm (22) away from the shaft sleeve (21) is pivotally connected to the roller.

9. The filter screen cleaning device according to any one of claims 1 to 5, characterized in that: A support plate (5) is provided at the second axial end of the central tube (1), a scraper (6) is provided on the support plate (5), and the circumferential edge of the scraper (6) elastically presses against the inner wall of the filter screen (20).

10. The filter screen cleaning device according to claim 9, characterized in that: The scraper (6) is a rubber ring plate, and the outer ring of the rubber ring plate elastically presses against the inner wall of the filter screen (20).

Images