Automatic filter cloth cleaning device based on plate-and-frame filter press

Abstract

The invention provides a novel automatic filter cloth cleaning device based on a plate-and-frame filter press, which comprises four connecting frames, and the four connecting frames are connected to the top of the plate-and-frame filter press; the two supporting columns are horizontally arranged in parallel, the two ends of each supporting column are fixedly connected with a connecting frame, and a long-strip-shaped supporting part is horizontally and movably arranged on each supporting column. The first driving mechanism is used for driving the supporting part to move on the supporting column; the two ends of the movable frame are fixedly connected with the supporting part, two cleaning frames and a second driving mechanism used for controlling the cleaning frames to ascend and descend are vertically arranged on the movable frame, cleaning pipes are horizontally arranged at the bottoms of the cleaning frames, cleaning nozzles are arranged on the inner sides of the cleaning pipes in a communicating mode, and water conveying pipes are externally connected to the cleaning pipes. The pre-flushing guide plate is connected with the bottom of the downstream cleaning pipe, the longitudinal section of the pre-flushing guide plate is inclined, the top of the pre-flushing guide plate is attached to the filter cloth to be cleaned, and the bottom of the pre-flushing guide plate is used for guiding water to the next filter cloth to be cleaned.

Description

Technical Field

[0001] This invention belongs to the technical field of plate and frame filter presses and relates to an automatic filter cloth cleaning device based on a plate and frame filter press. Background Technology

[0002] Plate and frame filter presses are machines used for chemical dewatering. Although plate and frame filter presses are generally operated intermittently, require large investments in infrastructure and equipment, and have relatively low filtration capacity, they are still widely used in some small wastewater treatment plants due to their advantages such as high filtration driving force, high solids content in the filter cake, clear filtrate, high solids recovery rate, and low consumption of conditioning chemicals.

[0003] Currently, after filtration in a plate and frame filter press, the filter cake separated from the filter cloth after the plates and frames separate from each other is typically washed for the next filtration. A common filter cloth washing method involves a support frame above the plate and frame filter press, on which a horizontally movable washing rack is mounted. This rack is connected to a lifting frame with two sets of opposing washing nozzles. During washing, the lifting frame lowers the washing nozzles to both sides of the filter cloth being washed, spraying high-pressure cleaning water. After one filter cloth is washed, the washing rack moves along the support frame to the next filter cloth for the next wash, repeating this cycle until all filter cloths are clean. Summary of the Invention

[0004] The purpose of this invention is to provide a new automatic filter cloth cleaning device based on a plate and frame filter press.

[0005] To achieve the above-mentioned technical effects, the present invention provides an automatic filter cloth cleaning device based on a plate and frame filter press, comprising:

[0006] The connecting frame is provided in four parts, and all four connecting frames are connected to the top of a plate and frame filter press;

[0007] The support column has two horizontally parallel support columns, both ends of which are fixedly connected to a connecting frame. Each support column has a long strip-shaped support part that is horizontally movable.

[0008] A first driving mechanism is used to drive the support part to move on the support column;

[0009] The movable frame has two ends fixedly connected to the support part. Two cleaning frames and a second drive mechanism for controlling the lifting and lowering of the cleaning frames are vertically arranged on the movable frame. A cleaning pipe is horizontally arranged at the bottom of each cleaning frame. A cleaning nozzle is connected to the inner side of the cleaning pipe, and a water supply pipe is connected to the outside of the cleaning pipe.

[0010] A pre-flushing guide plate is connected to the bottom of the downstream cleaning pipe. The longitudinal section of the pre-flushing guide plate is inclined, and the top of the pre-flushing guide plate is attached to the filter cloth being cleaned, while the bottom is used to guide water to the next filter cloth to be cleaned.

[0011] The invention is further configured such that the cleaning pipe is rectangular, and the cleaning nozzles are arranged in two horizontal rows on the cleaning pipe, and a support plate is arranged vertically on the cleaning frame, and all the cleaning pipes are connected to the support plate and pass through the support plate.

[0012] The present invention is further configured such that a plurality of connecting columns are vertically arranged at the bottom of the downstream support plate, and the bottom of all the connecting columns are connected to the upper side of the pre-punching guide plate.

[0013] The present invention is further configured such that a raised portion is horizontally connected to the bottom of the pre-flush guide plate, and the longitudinal section of the raised portion is an upward-opening arc shape.

[0014] The present invention is further configured such that a filter screen plate is provided at the bottom of the support plate located upstream, the side of the filter screen plate is attached to the filter cloth being cleaned, a rewash guide plate is provided at the bottom of the filter screen plate, the longitudinal section of the rewash guide plate is inclined, and the top of the rewash guide plate is used to receive the water filtered by the filter screen plate, and the bottom is used to guide the water to the previously cleaned filter cloth.

[0015] The present invention is further configured such that the filter screen plate is inclined, and a guide portion with a triangular longitudinal section is provided on the inner side of the top of the filter screen plate. The bottom of the longitudinal section of the guide portion is connected to the top of the filter screen plate, and the inner side is vertically attached to the filter cloth being washed. A baffle plate is vertically provided at the top of the filter screen plate, and a mud discharge port is provided at the bottom. A mud guide pipe is vertically provided at the bottom periphery of the mud discharge port. A mud baffle with an L-shaped cross-section is vertically provided on the upper side of the bottom of the filter screen plate, and the outer end of the mud baffle is connected to the inner side of the support plate.

[0016] The present invention is further configured such that the cleaning frame is U-shaped with the opening facing downwards, a cleaning roller is horizontally rotatably arranged between the two ends of the cleaning frame, a cleaning component is provided on the outer wall of the cleaning roller that is movably attached to the filter cloth, the cleaning roller and the cleaning component are both located between the two rows of cleaning nozzles, and a third driving mechanism is provided on the cleaning frame for driving the cleaning roller to rotate.

[0017] The present invention is further configured such that the second driving mechanism includes a lifting cylinder body vertically arranged on the movable frame, a synchronization plate is horizontally arranged at the bottom of the piston rod of the lifting cylinder body, the two sides of the synchronization plate are respectively connected to the two cleaning frames, and a plurality of stabilizing rods are vertically arranged at the top of the synchronization rod, all of the stabilizing rods vertically passing through the movable frame, and the outer wall of the stabilizing rods movably fitting against the movable frame;

[0018] The third drive mechanism includes an active roller that is horizontally rotatably connected to the outside of the cleaning frame. A transmission component is sleeved between the active roller and the outer wall of the cleaning roller. A passive gear is provided at the outer end of the active roller. Both sides of the movable frame are vertically provided with clearance openings. Several active teeth are vertically provided on the inner side of the clearance openings. The passive gear meshes with the active teeth.

[0019] The present invention is further configured such that a scraping plate is inclinedly provided on the inner side of the support plate, and the free end of the scraping plate is attached to the cleaning component.

[0020] The present invention is further configured such that the longitudinal section of the top of the support column is arc-shaped, and the bottom of the support part is provided with a mating groove that can be movably engaged with the top of the support column;

[0021] Each of the connecting frames is rotatably mounted on its top. The first drive mechanism includes a motor that drives the power wheels to rotate. A power belt is movably sleeved on the outer wall of the two power wheels on the same side, and the power belt is connected to the support portion.

[0022] Compared with existing technologies, this invention provides an automatic filter cloth cleaning device based on a plate and frame filter press. After filtration is completed and all filter plates are spaced apart, a first drive mechanism drives a movable frame above a filter plate. Then, a second drive mechanism lowers the cleaning frame, positioning the two cleaning frames on either side of the filter plate. High-pressure flushing water is then introduced into the flushing pipe via a water supply pipe and sprayed outwards through cleaning nozzles onto the filter cloth, thus achieving a flushing effect. Water on the downstream filter cloth flows onto a pre-flushing guide plate and, guided by the guide plate, acts on the next filter cloth to be flushed, thus pre-wetting and soaking the next filter cloth. This results in better flushing and cleaning effects when flushing the next filter cloth.

[0023] Because the filter cloth is flexible, even with the action of the pre-rinse guide plate (and re-rinse guide plate), some water on the filter cloth being rinsed will still directly flow downwards onto the unrinsed filter cloth on that plate, wetting and soaking that portion of the filter cloth to facilitate subsequent rinsing. Since the water only serves a wetting function, the required amount is relatively low. Furthermore, during actual rinsing, the cleaning nozzle can be either horizontal or tilted downwards (preferred). Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the invention in operation;

[0025] Figure 2 yes Figure 1 Enlarged view of section A;

[0026] Figure 3 yes Figure 1 Enlarged view of section B;

[0027] Figure 4 This is a schematic diagram of the structure of the present invention;

[0028] Figure 5 yes Figure 4 Enlarged view of section C;

[0029] Figure 6 yes Figure 4 Enlarged view of section D;

[0030] Figure 7 yes Figure 4 Enlarged view of section E in the middle;

[0031] Figure 8 This is a schematic diagram of the filter screen portion in this invention;

[0032] Figure 9 This is a cross-sectional view of the pre-punched guide plate portion in this invention.

[0033] The components are as follows: 1. Connecting frame; 2. Support column; 3. Support part; 4. Movable frame; 5. Cleaning frame; 6. Cleaning pipe; 7. Cleaning nozzle; 8. Water supply pipe; 9. Pre-flushing guide plate; 10. Support plate; 11. Connecting column; 12. Lifting part; 13. Filter screen plate; 14. Rewashing guide plate; 15. Guide part; 16. Baffle plate; 17. Mud drop outlet; 18. Mud guide pipe; 19. Mud baffle; 20. Cleaning roller; 21. Cleaning component; 22. Lifting cylinder; 23. Synchronizing plate; 24. Stabilizing bar; 25. Active roller; 26. Transmission component; 27. Passive gear; 28. Active gear; 29. ​​Scraper; 30. Fitting groove; 31. Power wheel; 32. Power belt. Detailed Implementation

[0034] The automatic filter cloth cleaning device based on a plate and frame filter press proposed in this invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this invention. The same or similar reference numerals in the drawings represent the same or similar parts.

[0035] An automatic filter cloth cleaning device based on a plate and frame filter press, such as Figures 1 to 9 As shown, it includes:

[0036] Connecting frame 1, four connecting frames 1 are provided, and all four connecting frames 1 are connected to the top of a plate and frame filter press;

[0037] Support column 2, two support columns 2 are arranged horizontally and parallel to each other, and both ends of the two support columns 2 are fixedly connected to a connecting frame 1. Each support column 2 has a long strip-shaped support part 3 that is horizontally movable (the long strip shape can improve the connection stability with the support column 2).

[0038] A first driving mechanism is used to drive the support part 3 to move on the support column 2;

[0039] The movable frame 4 has two ends fixedly connected to the support part 3. Two cleaning frames 5 and a second drive mechanism for controlling the lifting and lowering of the cleaning frames 5 are vertically arranged on the movable frame 4. A cleaning pipe 6 is horizontally arranged at the bottom of each cleaning frame 5. A cleaning nozzle 7 is connected to the inner side of the cleaning pipe 6. A water supply pipe 8 is connected to the outside of the cleaning pipe 6.

[0040] A pre-flushing guide plate 9 is connected to the bottom of the downstream cleaning pipe 6. The longitudinal section of the pre-flushing guide plate 9 is inclined, and the top of the pre-flushing guide plate 9 is attached to the filter cloth being cleaned, while the bottom is used to guide water to the next filter cloth to be cleaned.

[0041] The cleaning pipe 6 is rectangular, and the cleaning nozzles 7 are arranged in two horizontal rows on the cleaning pipe 6. The cleaning frame 5 is vertically provided with a support plate 10. All the cleaning pipes 6 are connected to the support plate 10 and pass through the support plate 10.

[0042] The bottom of the downstream support plate 10 is vertically provided with several connecting columns 11, and the bottom of all the connecting columns 11 is connected to the upper side of the pre-punching guide plate 9.

[0043] The bottom of the pre-flush guide plate 9 is horizontally connected to a lifting part 12, and the longitudinal section of the lifting part 12 is an arc shape with an opening facing upward.

[0044] A filter screen plate 13 is provided at the bottom of the support plate 10 located upstream. The side of the filter screen plate 13 is attached to the filter cloth being cleaned. A rewash guide plate 14 is provided at the bottom of the filter screen plate 13. The longitudinal section of the rewash guide plate 14 is inclined. The top of the rewash guide plate 14 is used to receive the water filtered by the filter screen plate 13, and the bottom is used to guide the water to the previously cleaned filter cloth.

[0045] The filter screen plate 13 is inclined. A guide portion 15 with a triangular longitudinal section is provided on the inner side of the top of the filter screen plate 13. The bottom of the longitudinal section of the guide portion 15 is connected to the top of the filter screen plate 13, and the inner side is vertically attached to the filter cloth being washed. A baffle plate 16 is vertically provided at the top of the filter screen plate 13, and a mud discharge port 17 is provided at the bottom. A mud guide pipe 18 is vertically provided around the bottom of the mud discharge port 17. A mud baffle 19 with an L-shaped cross section is vertically provided on the upper side of the bottom of the filter screen plate 13. The outer end of the mud baffle 19 is connected to the inner side of the support plate 10.

[0046] The cleaning frame 5 is U-shaped with the opening facing downwards. A cleaning roller 20 is horizontally rotatably arranged between the two ends of the cleaning frame 5. A cleaning component 21 that is movably attached to the filter cloth is provided on the outer wall of the cleaning roller 20. The cleaning roller 20 and the cleaning component 21 are both located between the two rows of cleaning nozzles 7. A third driving mechanism for driving the cleaning roller 20 to rotate is provided on the cleaning frame 5.

[0047] The second drive mechanism includes a lifting cylinder 22 vertically mounted on the movable frame 4. A synchronization plate 23 is horizontally mounted at the bottom of the piston rod of the lifting cylinder 22. The two sides of the synchronization plate 23 are respectively connected to the two cleaning frames 5. Several stabilizing rods 24 are vertically mounted at the top of the synchronization rod. All the stabilizing rods 24 pass vertically through the movable frame 4, and the outer wall of the stabilizing rods 24 is movably attached to the movable frame 4.

[0048] The third drive mechanism includes an active roller 25 that is horizontally rotatably connected to the outside of the cleaning frame. A transmission component 26 is sleeved between the active roller 25 and the outer wall of the cleaning roller 20. A passive gear 27 is provided at the outer end of the active roller 25. Both sides of the movable frame 4 are vertically provided with clearance openings. Several active teeth 28 are vertically provided on the inner side of the clearance openings. The passive gear 27 meshes with the active teeth 28.

[0049] A scraping plate 29 is inclinedly provided on the inner side of the support plate 10, and the free end of the scraping plate 29 is attached to the cleaning component 21.

[0050] The top of the support column 2 has a circular arc shape in longitudinal section, and the bottom of the support part 3 is provided with a mating groove 30 that can be movably fastened to the top of the support column 2.

[0051] Each of the connecting frames 1 is rotatably provided with a power wheel 31 at its top. The first driving mechanism includes a motor that drives the power wheel 31 to rotate. A power belt 32 is movably sleeved on the outer wall of the two power wheels 31 on the same side. The power belt 32 is connected to the support part 3.

[0052] The automatic filter cloth cleaning device based on a plate and frame filter press provided by this invention, when filtration is completed and all filter plates are in a spaced-out state, the first drive mechanism drives the movable frame 4 to be positioned above a filter plate. Then, the second drive mechanism lowers the cleaning frame 5, positioning the two cleaning frames 5 on either side of the filter plate. Next, high-pressure flushing water is input into the flushing pipe through the water supply pipe 8, and sprayed outwards through the cleaning nozzle 7 onto the filter cloth, thus achieving a flushing effect. The water on the downstream filter cloth flows onto the pre-flushing guide plate 9, and is guided by the pre-flushing guide plate 9 to act on the next filter cloth to be flushed, thereby pre-wetting and soaking the next filter cloth. This allows for better flushing and cleaning results when flushing the next filter cloth.

[0053] Because the filter cloth is flexible, even with the action of the pre-rinse guide plate 9 (and the re-rinse guide plate 14), some water on the filter cloth being rinsed will still directly flow downwards onto the unrinsed filter cloth on the same plate, wetting and soaking that portion of the filter cloth to facilitate subsequent rinsing. Since the water only serves a wetting function, the required amount is relatively low. Furthermore, during actual rinsing, the cleaning nozzle 7 can be either horizontal or tilted downwards (preferably).

[0054] During actual rinsing of the filter cloth, the motor drives the power wheel 31 to rotate, which in turn drives the power belt 32 (preferably a conventional structure such as a belt or chain) to move, thereby driving the support part 3 to move on the support column 2; preferably, one motor drives four power wheels 31 to rotate, thus ensuring the stability of the movable frame 4. When the movable frame 4 moves to the designated position, the lifting cylinder 22 drives the synchronous plate 23 to move downward, and under the action of the active gear 28 and the passive gear 27, the active roller 25 rotates; at the same time, the transmission component 26 (preferably a belt or chain, if it is a chain, sprockets are provided at the outer end of the cleaning roller 20 and the inner end of the active roller 25) drives the cleaning roller 20 and the cleaning component 21 to rotate, and when the cleaning nozzle 7 is facing the filter cloth, the water supply pipe 8 inputs high-pressure cleaning water, so that the cleaning component 21 and the cleaning nozzle 7 can simultaneously clean and wash the filter cloth.

[0055] When the movable frame 4 moves downwards, the cleaning component 21 rotates downwards on the side closest to the filter cloth. This effectively brushes or knocks off tightly adhered impurities from the filter cloth, ensuring the cleaning quality of the filter cloth. The cleaning component 21 is preferably made of a material with high resistance, such as rubber or a brush, to achieve sufficient cleaning effect on the impurities. If it is made of rubber, the scraper 29 is plate-shaped; if it is made of a brush, the scraper 29 is comb-shaped. This allows the scraper 29 to effectively clean the cleaning component 21, ensuring its cleaning effect on the filter cloth.

[0056] Furthermore, since the two rows of cleaning nozzles 7 are located on the upper and lower sides of the cleaning component 21, during the actual cleaning process, the lower row of cleaning nozzles 7 first washes away the easily rinsed impurities. Then, through the brushing or impact action of the cleaning component 21, the impurities can be directly cleaned while some of them are loosened, making them easier for the upper row of cleaning nozzles 7 to clean. After this triple cleaning, the filter cloth can be thoroughly cleaned.

[0057] The downstream cleaning water, guided by the pre-rinse guide plate 9 and lifted upwards by the lifting section 12, allows the downstream filter cloth, which has not yet been cleaned, to be pre-wetted and partially rinsed, facilitating the formal rinsing. Meanwhile, the upstream cleaning water, flowing downwards, is filtered by the filter screen plate 13. The cleaner water then flows down to the re-rinse guide plate 14, further rinsing the previously cleaned filter cloth, thus improving the cleaning effect.

[0058] When the wastewater flows down onto the filter screen 13, the downward tilt of the filter screen 13 increases the filtration time and the amount of water passing through it, resulting in more water reaching the upper filter cloth. Simultaneously, the baffle plate 16 and support plate 10 limit the flow of wastewater, further increasing the amount of filtered water. The tilted filter screen 13 also guides the water flow, allowing it to be rinsed and preventing clogging, thus ensuring effective filtration. The water containing sludge, after being supported by the support plate 10 and the sludge baffle 19, passes through the sludge outlet 17 and is discharged downwards by the sludge guide pipe 18. Preferably, the sludge guide pipe 18 has a receiving trough or other structure below it for centralized sludge treatment.

[0059] After all the filter cloths on the filter plate have been cleaned, the lifting cylinder 22 raises the synchronous plate 23 and the two cleaning frames 5. At this time, the water supply pipe 8 no longer supplies high-pressure water, but the cleaning component 21 can still brush or clean the filter cloth, thereby further ensuring the cleaning effect of the filter cloth. The distance between the synchronous plate 23 and the top of the movable frame 4 is sufficient to raise the pre-rinsing guide plate 9, the re-rinsing guide plate 14, etc., to a height higher than the filter plate, so that the pre-rinsing guide plate 9, the re-rinsing guide plate 14, etc., can pass over any filter plate. The attached diagram is for illustration only and does not represent the actual structure. After all the structures are higher than the filter plate, the motor drives the movable frame 4 to move a certain distance to reach the top of the next filter frame to be cleaned. The filter cloths on both sides of each filter plate (except for the two ends) can be pre-rinsed or re-rinsed, thus making the overall cleaning effect of the filter cloth better.

[0060] In the actual rinsing process, although the filter cloth that has been cleaned previously cannot be completely or entirely rinsed by the filtered water, some of the filter cloth is rinsed a second time, which can still produce a certain cleaning effect and allow the filter cloth to have a better filtration effect in subsequent filtrations. Similarly, although the next filter cloth to be rinsed cannot be completely or entirely wetted or pre-rinsed, some of it can be wetted or pre-rinsed in advance, so that part of the filter cloth can receive a better cleaning effect.

[0061] Furthermore, both the upstream and downstream flushing nozzles are located between the filter cloth and the support plate 10. When the high-pressure water washes onto the filter cloth, it will splash outwards. At this time, the support plate 10 can block the splashing water, which not only prevents the sewage from acting on the outgoing and cleaned filter cloth, but also blocks the filter cloth, so that the sewage flows downwards as much as possible onto the pre-flushing guide plate 9 or the filter screen plate 13.

[0062] It should also be noted that all terms such as "set up" and similar descriptive words in this application (especially the specification) indicate that two structures have or exist a connection relationship. However, the specific means by which the two are connected are not limited in detail, and are usually conventional connection methods. That is, the means should be understood as prior art and do not need to be elaborated. For example, "m is set up with n" only indicates that structure m has structure n, and whether the two are connected by welding, riveting, adhesive, or integral molding is within the scope of protection of this application. Similarly, "x is rotatably set up with y" only indicates that y and x can rotate relative to each other, and whether the two are connected by a bearing, or whether y directly passes through x and is rotatably connected to x, or other feasible methods, are all within the scope of protection of this application.

[0063] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A filter cloth automatic cleaning device based on a plate-and-frame filter press, characterized in that, The utility model relates to a filter cloth cleaning device for plate-and-frame filter press, which comprises: a connecting frame (1) provided with four connecting frames (1) connected to the top of a plate-and-frame filter press; two support columns (2) horizontally and parallelly arranged, with both ends of the two support columns (2) fixedly connected to a connecting frame (1), and a long strip-shaped support part (3) movably arranged on each support column (2); a first driving mechanism for driving the support part (3) to move on the support column (2); a movable frame (4) with both ends fixedly connected to the support part (3), two cleaning frames (5) vertically arranged on the movable frame (4), and a second driving mechanism for controlling the cleaning frames (5) to move up and down, the bottom of each cleaning frame (5) horizontally provided with a cleaning pipe (6), the inner side of the cleaning pipe (6) communicated with a cleaning nozzle (7), and the cleaning pipe (6) externally connected to a water supply pipe (8); a pre-flushing guide plate (9) connected to the bottom of the cleaning pipe (6) located downstream, the longitudinal section of the pre-flushing guide plate (9) being inclined, and the top of the pre-flushing guide plate (9) abutting on the filter cloth being cleaned, and the bottom of the pre-flushing guide plate (9) used for guiding water to the filter cloth to be cleaned next.

2. The filter cloth automatic cleaning device based on the plate-and-frame filter press according to claim 1, characterized in that, The cleaning pipe (6) is rectangular, and the cleaning nozzle (7) is horizontally arranged in two rows on the cleaning pipe (6), a support plate (10) vertically arranged on the cleaning frame (5), all the cleaning pipes (6) connected to the support plate (10) and penetrating through the support plate (10).

3. The filter cloth automatic cleaning device based on plate-and-frame filter press according to claim 2, characterized in that, The bottom of the support plate (10) located downstream is vertically provided with a plurality of connecting columns (11), and the bottom of each connecting column (11) is connected to the upper side of the pre-flushing guide plate (9).

4. The filter cloth automatic cleaning device based on the plate-and-frame filter press according to claim 3, characterized in that, The bottom of the pre-flushing guide plate (9) is horizontally connected with a lifting part (12), and the longitudinal section of the lifting part (12) is in the shape of an upward-opening circular arc.

5. The filter cloth automatic cleaning device based on plate-and-frame filter press according to claim 2, characterized in that, The bottom of the support plate (10) located upstream is provided with a filter screen plate (13), the side of the filter screen plate (13) abutting on the filter cloth being cleaned, the bottom of the filter screen plate (13) provided with a rewashing guide plate (14), the longitudinal section of the rewashing guide plate (14) being inclined, and the top of the rewashing guide plate (14) used for receiving water filtered by the filter screen plate (13), and the bottom of the rewashing guide plate (14) used for guiding water to the filter cloth cleaned last.

6. The filter cloth automatic cleaning device based on plate-and-frame filter press according to claim 5, characterized in that, The filter screen plate (13) is inclined, the inner side of the top of the filter screen plate (13) is provided with a guide part (15) with a longitudinal section in the shape of a triangle, the bottom of the longitudinal section of the guide part (15) is connected with the top of the filter screen plate (13), the inner side is vertically attached to the filter cloth being cleaned, the top end of the filter screen plate (13) is vertically provided with a blocking plate (16), the bottom end is provided with a mud falling opening (17), the bottom periphery of the mud falling opening (17) is vertically provided with a mud guide pipe (18), the upper side of the bottom end of the filter screen plate (13) is vertically provided with a mud blocking part (19) with an L-shaped cross section, and the outer end of the mud blocking part (19) is connected with the inner side of the support plate (10).

7. The filter cloth automatic cleaning device based on plate-and-frame filter press according to claim 2, characterized in that, The cleaning frame (5) is in the shape of a U with an opening downward, a cleaning roller (20) is horizontally rotatably arranged between the two ends of the cleaning frame (5), the outer wall of the cleaning roller (20) is provided with a cleaning part (21) movably attached to the filter cloth, and the cleaning roller (20) and the cleaning part (21) are located between the two rows of cleaning nozzles (7).

8. The filter cloth automatic cleaning device based on plate-and-frame filter press according to claim 7, characterized in that, The second driving mechanism comprises a lifting cylinder (22) vertically arranged on the movable frame (4), the bottom of the piston rod of the lifting cylinder (22) is horizontally provided with a synchronous plate (23), the two sides of the synchronous plate (23) are connected with two cleaning frames (5) respectively, and the top of the synchronous plate is vertically provided with a plurality of stabilizing rods (24), all the stabilizing rods (24) vertically pass through the movable frame (4), and the outer wall of the stabilizing rod (24) is movably attached to the movable frame (4). The third driving mechanism comprises a driving roller (25) rotatably connected to the outer side of the cleaning frame, a transmission part (26) is sleeved between the outer wall of the driving roller (25) and the cleaning roller (20), the outer end of the driving roller (25) is provided with a driven gear (27), the two sides of the movable frame (4) are vertically provided with a plurality of driving gear bodies (28), and the driven gear (27) is engaged with the driving gear bodies (28).

9. The filter cloth automatic cleaning device based on plate-and-frame filter press according to claim 8, characterized in that, The inner side of the support plate (10) is obliquely provided with a scraping plate (29), and the free end of the scraping plate (29) is attached to the cleaning part (21).

10. The filter cloth automatic cleaning device based on plate-and-frame filter press according to claim 1, characterized in that, The top of the support column (2) is in the shape of a circular arc in the longitudinal section, and the bottom of the support part (3) is provided with a matching groove (30) movably buckled on the top of the support column (2). The top of each connecting frame (1) is rotatably provided with a power wheel (31), the first driving mechanism comprises a motor for driving the power wheel (31) to rotate, the outer walls of the two power wheels (31) on the same side are movably sleeved with a power belt (32), and the power belt (32) is connected with the support part (3).

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