Multi-stage sewage filtering device with self-cleaning function

Abstract

The invention belongs to the technical field of sewage treatment, and discloses a multi-stage sewage filtering device with a self-cleaning function, the multi-stage sewage filtering device comprises a main body shell, a plurality of filtering discs are fixedly connected in the main body shell in a linear distribution mode, and the multi-stage sewage filtering device further comprises a first cleaning assembly, a second cleaning assembly and a third cleaning assembly, the first cleaning assembly is installed in the main body shell and used for cleaning the tops of the filtering discs; the second cleaning assembly is mounted on the filtering disc and is used for cleaning the first cleaning assembly; through cooperation of the filter disc, the first cleaning assembly and other structures, impurities on the filter disc can be conveniently cleaned, so that the filtering effect is ensured, the motor drives the rotating shaft to rotate, the rotating shaft drives the cleaning brush to rotate, the cleaning brush cleans the interior of the filter disc, and the filtering effect is ensured. When the cleaning brush carries impurities to pass through the water blocking plate of the filtering disc, the impurities can be cleaned from the opening and fall into the residue discharging channel, so that the impurities in the filtering disc are discharged, and the filtering disc is cleaned.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and specifically relates to a multi-stage sewage filtration device with a self-cleaning function. Background Art

[0002] Multi-stage sewage filtration is a process of purifying water quality by using hierarchical treatment technology to sequentially pass sewage through filtering media with different functions, gradually removing suspended solids, colloids, dissolved pollutants and microorganisms. Through the hierarchical synergistic effect, it realizes the gradual purification from coarse filtration to fine filtration, and is applicable to municipal water supply, industrial wastewater reuse and the preparation of high-purity water.

[0003] During the filtration process: as the filtration work continues, various impurities in the sewage will inevitably remain on the surface of the filter screen. At this time, it is necessary to clean the filter screen. At this time, it is often necessary to stop filtration to clean or replace the filter screen, which will affect the filtration efficiency. Therefore, a multi-stage sewage filtration device with a self-cleaning function is proposed. Summary of the Invention

[0004] To solve the problem that stopping filtration during the cleaning of the filter screen affects the filtration efficiency as mentioned in the above background art, the present invention provides a multi-stage sewage filtration device with a self-cleaning function.

[0005] To achieve the above object, the present invention provides the following technical solution: A multi-stage sewage filtration device with a self-cleaning function, including a main body housing, and a plurality of filter discs are fixedly connected in a linear distribution inside the main body housing, and further includes:

[0006] A first cleaning component, which is installed inside the main body housing for cleaning the top of the filter disc;

[0007] A second cleaning component, which is installed on the filter disc for cleaning the first cleaning component;

[0008] A water delivery component, which is arranged inside the main body housing for diverting sewage;

[0009] Among them, the first cleaning component includes a rotating shaft rotatably connected to the main body housing, and a plurality of cleaning brushes are linearly distributed in the middle of the rotating shaft;

[0010] The second cleaning component includes a scraper fixedly connected to the filter disc, and a knife sheath is slidably connected to the outside of the scraper.

[0011] Preferably, an opening for discharging slag is provided in the middle of the filter disc, and a water retaining plate with an inclined surface is arranged on one side of the slag discharge port. A slag discharge channel is fixedly connected inside the main body housing, and an inclined slot with an upward opening is arranged on the side of the slag discharge channel, and the inclined slot is located below the opening of the filter disc for discharging slag. An inlet is provided at the top of the main body housing.

[0012] Preferably, the top of the rotating shaft penetrates the main body housing and is fixedly connected to a motor. The middle part of the rotating shaft is linearly distributed with support disks corresponding to the filter disks. The support disks are located above the filter disks, and elastic pressing plates are arranged on the lower sides of the support disks.

[0013] Preferably, the cleaning brush is slidably connected inside the filter disk. One end of the cleaning brush is slidably connected to the rotating shaft. The cleaning brush is located between the elastic pressing plate and the filter disk, and the elastic pressing plate is slidably connected to both the support disk and the rotating shaft.

[0014] Preferably, the scraping knife is fixedly connected inside the filter disk, and the scraping knife is located on one side of the slag discharging opening in the middle of the filter disk away from the water retaining plate. The knife sleeve is slidably connected to the filter disk. The two ends of the knife sleeve are respectively fixedly connected to a first elastic member and a second elastic member. The two ends of the knife sleeve are both slidably connected to the filter disk, and both are provided with stoppers extending to the lower side of the filter disk.

[0015] Preferably, the second cleaning assembly further includes a push rod and an inclined surface abutting block arranged on the lower side of the filter disk. The push rod is slidably connected to the rotating shaft. One end of the push rod located inside the rotating shaft is fixedly connected to a third elastic member. The inclined surface abutting block is fixedly connected to the top of the filter disk and is located below the knife sleeve. The first elastic member and the second elastic member are both fixedly connected to the filter disk.

[0016] Preferably, one corner of the push rod close to the inclined surface abutting block is set as an inclined surface. When the push rod rotates, it will abut against the stopper at the bottom of the knife sleeve, and then move to abut against the inclined surface abutting block. Limited by the inclined surface abutting block, the push rod moves downward to cross the stopper at the bottom of the knife sleeve.

[0017] Preferably, when the rotating shaft drives the cleaning brush to rotate to the opening of the filter disk, at this time, the cleaning brush is limited by the water retaining plate and gradually rises along the baffle. After crossing the water retaining plate, it is pushed downward quickly by the elastic pressing plate and then contacts the scraping knife.

[0018] Preferably, the water conveying assembly includes a water conveying groove opened inside the main body housing and a water dividing notch opened on the outer edge of the filter disk. A guide plate is fixedly connected to the middle of the water conveying groove. A discharge port is opened at the lower end of the main body housing.

[0019] Preferably, the water conveying groove is located on one side of the main body housing away from the slag discharging channel. The guide plate is inclined downward toward the middle of the filter disk. The water dividing notch corresponds to the position of the water conveying groove, and there is no water dividing notch on the outer edge of the filter disk at the bottom.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] Through the cooperation of structures such as a filter disc and a first cleaning component, the present invention facilitates the cleaning of impurities on the filter disc, thereby ensuring the filtering effect. The motor drives the rotating shaft to rotate, and the rotating shaft drives the cleaning brush to rotate, so that the cleaning brush cleans the inside of the filter disc. When the cleaning brush carries impurities and passes through the water retaining plate of the filter disc, the impurities can be cleaned and fallen into the slag discharge channel through the opening, thereby discharging the impurities inside the filter disc and cleaning the filter disc.

[0022] Through the cooperation of structures such as a first cleaning component and a second cleaning component, the present invention facilitates the cleaning of the first cleaning component, avoiding the accumulation of impurities on the first cleaning component and affecting the cleaning effect. The cleaning brush will pass by the scraper, and the scraper scrapes the impurities wound on the rotating shaft to clean the cleaning brush and ensure the cleaning effect of the cleaning brush on the filter disc.

[0023] Through the cooperation of structures such as a knife sleeve and a push rod, the present invention facilitates the cleaning of the scraper, avoiding the accumulation of impurities and affecting the cleaning effect. While the cleaning brush moves, the push rod at the bottom of the filter disc will move synchronously. The push rod will push the knife sleeve to move. After the push rod abuts against the inclined surface block, the limit on the knife sleeve is released, and the first elastic member and the second elastic member drive the first elastic member to slide and reset, and the knife sleeve cleans the scraper, thereby completing self-cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 is a middle cross-sectional view of the main body housing of the present invention;

[0026] Figure 3 is a schematic diagram of the overall filter disc of the present invention;

[0027] Figure 4 is an enlarged detailed view of the second cleaning component of the present invention;

[0028] Figure 5 is a schematic diagram of the bottom of the filter disc of the present invention;

[0029] Figure 6 is Figure 5 the enlarged view at A in

[0030] Figure 7 is a schematic diagram of the overall water delivery component of the present invention;

[0031] Figure 8 is a cross-sectional view of the slag discharge channel of the present invention.

[0032] In the figure: 1, main body housing; 2, filter disc; 3, first cleaning component; 301, rotating shaft; 302, support disc; 303, elastic pressing plate; 304, cleaning brush; 4, second cleaning component; 401, scraper; 402, cutter sleeve; 403, first elastic member; 404, second elastic member; 405, push rod; 406, third elastic member; 407, inclined surface abutting block; 5, water delivery component; 501, water delivery groove; 502, guide plate; 503, water diversion notch; 504, discharge port; 6, slag discharge channel; 7, water inlet. Detailed implementation manners

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] As Figures 1 to 8 shown, the present invention provides a multi-stage sewage filtering device with a self-cleaning function, including a main body housing 1, and a plurality of filter discs 2 are fixedly connected in a linear distribution inside the main body housing 1. The device further includes:

[0035] A first cleaning component 3, which is installed inside the main body housing 1 for cleaning the top of the filter disc 2;

[0036] A second cleaning component 4, which is installed on the filter disc 2 for cleaning the first cleaning component 3;

[0037] A water delivery component 5, which is arranged inside the main body housing 1 for diverting sewage;

[0038] Among them, the first cleaning component 3 includes a rotating shaft 301 rotatably connected to the main body housing 1, and a plurality of cleaning brushes 304 are linearly distributed in the middle of the rotating shaft 301;

[0039] The second cleaning component 4 includes a scraper 401 fixedly connected to the filter disc 2, and a cutter sleeve 402 is slidably connected to the outside of the scraper 401.

[0040] Adopting the above solution: The rotating shaft 301 is driven to rotate by a motor, and the cleaning brush 304 is driven by the rotating shaft 301 to rotate, so that the cleaning brush 304 cleans the inside of the filter disc 2. When the cleaning brush 304 carries impurities and passes through the water retaining plate of the filter disc 2, it will be limited by the water retaining plate and squeezed upward, causing the cleaning brush 304 to move up a certain distance. Then, after passing through the water retaining plate, the cleaning brush 304 is pushed to quickly fall by the elastic pressing plate 303, shaking off the impurities adhered to the cleaning brush 304;

[0041] As the cleaning brush 304 moves, the push rod 405 at the bottom of the filter disc 2 will move synchronously. When the cleaning brush 304 moves to the opening, the push rod 405 will conflict with the bottom stop block of the knife sleeve 402 to push the knife sleeve 402 to slide along the filter disc 2, exposing the scraper 401. Then the cleaning brush 304 will pass through the scraper 401, and the scraper 401 will scrape off the impurities wrapped around the rotating shaft 301. Then the cleaning brush 304 continues to move. At this time, the push rod 405 will push the knife sleeve 402 to move to the inclined surface stop block 407 and conflict with the inclined surface stop block 407. The push rod 405 is limited by the inclined surface stop block 407 to move downward, releasing the limit on the knife sleeve 402, and the first elastic member 403 and the second elastic member 404 drive the first elastic member 403 to slide and reset. At this time, the cleaning brush 304 has passed the scraper 401 to complete cleaning.

[0042] like Figure 1 、 Figure 2 、 Figure 7 and Figure 8 As shown, an opening for slag discharge is provided in the middle of the filter disc 2, and a water retaining plate with an inclined surface is provided on one side of the slag discharge opening. A slag discharge channel 6 is fixedly connected to the inside of the main shell 1, and an inclined groove with an upward opening is provided on the side of the slag discharge channel 6. The inclined groove is located on the lower side of the slag discharge opening of the filter disc 2, and a water inlet 7 is provided on the top of the main shell 1.

[0043] The above-mentioned solution is adopted: through the slag discharge opening opened in the middle of the filter disc 2, the impurities cleaned on the filter disc 2 are easily discharged from the inside of the filter disc 2. By setting a water retaining plate with an inclined surface, the cleaning brush 304 can carry the impurities and pass through the water retaining plate to carry the impurities out along the inclined surface, thereby avoiding the accumulation of impurities on the water retaining plate. The setting of the slag discharge channel 6 can receive and discharge the impurities cleaned on the filter disc 2 in a centralized manner.

[0044] like Figures 2 to 6 As shown, the top of the rotating shaft 301 penetrates the main shell 1 and is fixedly connected to the motor, and the middle part of the rotating shaft 301 is linearly distributed with a support plate 302 corresponding to the filter disc 2, the support plate 302 is located on the upper side of the filter disc 2, and an elastic pressure plate 303 is provided on the lower side of the support plate 302, and a cleaning brush 304 is slidably connected to the inside of the filter disc 2, and one end of the cleaning brush 304 is slidably connected to the rotating shaft 301, and the cleaning brush 304 is located between the elastic pressure plate 303 and the filter disc 2, and the elastic pressure plate 303 is slidably connected to the support disc 302 and the rotating shaft 301.

[0045] Adopting the above solution: The setting of the first cleaning component 3 facilitates the cleaning of impurities on the filter disc 2. The cleaning brush 304 is driven by the rotating shaft 301 to rotate for cleaning the filter disc 2. The support disc 302 and the elastic pressing plate 303 are provided to limit the cleaning brush 304. The support disc 302 supports the elastic pressing plate 303, so that the elastic pressing plate 303 presses down the cleaning brush 304. When the cleaning brush 304 passes by the water retaining plate, the spring in the elastic pressing plate 303 will be compressed. When passing over the water retaining plate, the spring releases and pushes the cleaning brush 304 to move down quickly, throwing off the debris and adhered impurities on the cleaning brush 304, and cleaning the cleaning brush 304 to a certain extent.

[0046] As Figures 3 to 6 shown, the scraping knife 401 is fixedly connected inside the filter disc 2, and the scraping knife 401 is located on one side of the slag discharge opening in the middle of the filter disc 2 away from the water retaining plate. The knife sleeve 402 is slidably connected to the filter disc 2. The two ends of the knife sleeve 402 are respectively fixedly connected with a first elastic member 403 and a second elastic member 404. Both ends of the knife sleeve 402 are slidably connected to the filter disc 2, and both are provided with blocks extending to the lower side of the filter disc 2.

[0047] Adopting the above solution: By setting the scraping knife 401, the impurities wound on the cleaning brush 304 are cleaned by the scraping knife 401. When the cleaning brush 304 passes by the scraping knife 401, the scraping knife 401 inserts into the gap between the bristles of the rotating shaft 301 to scrape off the impurities;

[0048] The setting of the knife sleeve 402 is used to remove the impurities scraped off by the scraping knife 401 from the scraping knife 401, keeping the scraping knife 401 clean and avoiding the accumulation of impurities. The knife sleeve 402 is limited by the first elastic member 403 and the second elastic member 404 at both ends, so that after the knife sleeve 402 is pushed away from the scraping knife 401, it can reset to the position of the scraping knife 401, and then the impurities are pushed into the slag discharge opening of the filter disc 2 from one end of the scraping knife 401 away from the water retaining plate and fall into the slag discharge channel 6.

[0049] As Figures 3 to 6 shown, the second cleaning component 4 further includes a push rod 405 and an inclined surface abutting block 407 arranged on the lower side of the filter disc 2. The push rod 405 is slidably connected to the rotating shaft 301. One end of the push rod 405 located inside the rotating shaft 301 is fixedly connected with a third elastic member 406. The inclined surface abutting block 407 is fixedly connected to the top of the filter disc 2 and is located below the knife sleeve 402. The first elastic member 403 and the second elastic member 404 are both fixedly connected to the filter disc 2. One corner of the push rod 405 close to the inclined surface abutting block 407 is provided as an inclined surface. When the push rod 405 rotates, it will abut against the bottom block of the knife sleeve 402, and then move to abut against the inclined surface abutting block 407. Limited by the inclined surface abutting block 407, the push rod 405 moves downward to cross the block at the bottom of the knife sleeve 402.

[0050] Adopting the above solution: The push rod 405 arranged under the filter disc 2 can push the cutter sleeve 402 to move, so that the cutter sleeve 402 moves away from the scraping knife 401, enabling the scraping knife 401 to clean the cleaning brush 304. The push rod 405 abuts against the bottom block of the cutter sleeve 402, so that while the rotating shaft 301 rotates, the push rod 405 can push the cutter sleeve 402 to move;

[0051] When the inclined surface abutting block 407 abuts against the push rod 405, the inclined surface on the inclined surface abutting block 407 will limit the push rod 405, causing the push rod 405 to move downward, releasing the limit on the block of the cutter sleeve 402, so that the cutter sleeve 402 can reset to clean the scraping knife 401.

[0052] As Figures 2 to 8 shown, when the rotating shaft 301 drives the cleaning brush 304 to rotate to the opening of the filter disc 2, at this time, the cleaning brush 304 is limited by the water retaining plate and gradually rises along the baffle. After passing over the water retaining plate, it is pushed downward quickly by the elastic pressing plate 303 and then contacts the scraping knife 401.

[0053] Adopting the above solution: When the rotating shaft 301 drives the cleaning brush 304 to rotate to the opening of the filter disc 2, at this time, the cleaning brush 304 is limited by the water retaining plate, the bristles at the bottom of the cleaning brush 304 are bent and gradually rise along the baffle. After the cleaning brush 304 passes over the water retaining plate, the spring compressed by the elastic pressing plate 303 at the top of the cleaning brush 304 will be released, so that the elastic pressing plate 303 pushes the cleaning brush 304 to move downward quickly, throwing off the adhered impurities, and then continuing to move to contact the scraping knife 401.

[0054] As Figure 3 and Figure 7 shown, the water delivery component 5 includes a water delivery groove 501 opened inside the main body housing 1 and a water diversion notch 503 opened on the outer edge of the filter disc 2. A guide plate 502 is fixedly connected to the middle of the water delivery groove 501. A discharge port 504 is opened at the lower end of the main body housing 1. The water delivery groove 501 is located on the side of the main body housing 1 away from the slag discharge channel 6. The guide plate 502 is inclined downward toward the middle of the filter disc 2. The water diversion notch 503 corresponds to the position of the water delivery groove 501, and there is no water diversion notch 503 on the outer edge of the filter disc 2 at the bottom.

[0055] Adopting the above solution: By setting the water delivery component 5, the filtration efficiency can be ensured when there are more impurities in the sewage. When there are too many impurities retained inside the top filter disc 2, part of the sewage directly transfers to the top of the lower filter disc 2 along the guide plate 502. The lower filter disc 2 can receive the sewage conveyed by the guide plate 502 and the water filtered once by the top filter disc 2. The water falling from the top filter disc 2 will impact and dilute the water conveyed by the guide plate 502, making the impurities in the middle filter disc 2 not easy to accumulate, and finally directly conveying to the bottom filter disc 2 for re - filtration, so as to ensure the filtration effect and efficiency.

[0056] Working principle and usage process of the present invention: When in use, sewage is conveyed into the main body housing 1 through the water inlet 7. At this time, the sewage will first enter the internal part of the upper filter disc 2, and then enter the internal part of the lower filter disc 2 after filtration, and so on downward until it is discharged from the discharge port 504. When the sewage is blocked by a large amount of impurities in the upper filter disc 2, the sewage in the filter disc 2 will be discharged from the water distribution notch 503 and discharged into the internal part of the lower filter disc 2 along the guide plate 502 to avoid affecting the filtration efficiency;

[0057] When the filter disc 2 is filtering, at this time, the rotating shaft 301 is driven to rotate by the motor, and the cleaning brush 304 is driven to rotate by the rotating shaft 301, so that the cleaning brush 304 cleans the internal part of the filter disc 2. When the cleaning brush 304 passes through the water retaining plate of the filter disc 2 with impurities, it will be limited and upwardly extruded by the water retaining plate, so that the cleaning brush 304 moves up a certain distance. Then, after passing through the water retaining plate, the cleaning brush 304 is pushed to quickly fall by the elastic pressing plate 303, and the impurities adhered to the cleaning brush 304 are shaken off;

[0058] While the cleaning brush 304 is moving, the push rod 405 at the bottom of the filter disc 2 will move synchronously. When the cleaning brush 304 moves to the opening, the push rod 405 abuts against the bottom block of the tool sleeve 402 to push the tool sleeve 402 to slide along the filter disc 2, exposing the scraping knife 401. Then the cleaning brush 304 will pass through the scraping knife 401, and the impurities wound on the rotating shaft 301 are scraped off by the scraping knife 401. Then the cleaning brush 304 continues to move. At this time, the push rod 405 will push the tool sleeve 402 to move to the inclined surface abutting block 407 and abut against the inclined surface abutting block 407. Limited by the inclined surface abutting block 407, the push rod 405 moves downward to release the limit on the tool sleeve 402, and the first elastic member 403 and the second elastic member 404 drive the first elastic member 403 to slide back to its original position. At this time, the cleaning brush 304 has passed over the scraping knife 401 to complete the cleaning;

[0059] Finally, the tool sleeve 402 returns to its original position to clean the hair and impurities on the scraping knife 401, avoiding the accumulation of impurities at the scraping knife 401, thereby completing the cleaning of the filter disc 2. The impurities shaken off at the cleaning brush 304 and the impurities scraped off at the scraping knife 401 directly fall from the opening of the filter disc 2 to the middle of the slag discharge channel 6 and are discharged;

[0060] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0061] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage sewage filtration device with a self-cleaning function, comprising a main body housing (1), wherein a plurality of filter discs (2) are fixedly connected in a linear distribution inside the main body housing (1), and it is characterized in that, Further included are: A first cleaning component (3) which is installed inside the main body housing (1) for cleaning the top of the filter disc (2); A second cleaning component (4) which is installed on the filter disc (2) for cleaning the first cleaning component (3); A water delivery component (5) which is arranged inside the main body housing (1) for diverting sewage; Wherein, the first cleaning component (3) includes a rotating shaft (301) rotatably connected to the main body housing (1), and a plurality of cleaning brushes (304) are linearly distributed in the middle of the rotating shaft (301); The second cleaning component (4) includes a scraper (401) fixedly connected to the filter disc (2), and a knife sheath (402) is slidably connected to the outside of the scraper (401).

2. The multi-stage sewage filtration device with self-cleaning function according to claim 1, characterized in that: An opening for discharging slag is formed in the middle of the filter disc (2), and a water retaining plate with an inclined surface is arranged on one side of the slag discharge port. A slag discharge channel (6) is fixedly connected inside the main body housing (1). An inclined slot with an upward opening is arranged on the side of the slag discharge channel (6), and this inclined slot is located below the opening of the filter disc (2) for discharging slag. An inlet (7) is arranged at the top of the main body housing (1).

3. The multi-stage sewage filtration device with self-cleaning function according to claim 1, characterized in that: The top of the rotating shaft (301) penetrates the main body housing (1) and is fixedly connected to a motor. Support discs (302) corresponding to the filter disc (2) are linearly distributed in the middle of the rotating shaft (301). The support discs (302) are located above the filter disc (2), and elastic pressing plates (303) are arranged on the lower sides of the support discs (302).

4. The multi-stage sewage filtration device with self-cleaning function according to claim 3, characterized in that: The cleaning brushes (304) are slidably connected inside the filter disc (2). One end of the cleaning brush (304) is slidably connected to the rotating shaft (301). The cleaning brushes (304) are located between the elastic pressing plates (303) and the filter disc (2). The elastic pressing plates (303) are slidably connected to both the support discs (302) and the rotating shaft (301).

5. The multi-stage sewage filtration device with self-cleaning function according to claim 1, characterized in that: The scraper (401) is fixedly connected inside the filter disc (2), and the scraper (401) is located on the side of the opening for discharging slag in the middle of the filter disc (2) away from the water retaining plate. The knife sheath (402) is slidably connected to the filter disc (2). A first elastic member (403) and a second elastic member (404) are respectively fixedly connected to both ends of the knife sheath (402). Both ends of the knife sheath (402) are slidably connected to the filter disc (2), and stoppers extending to the lower side of the filter disc (2) are arranged.

6. The multi-stage sewage filtration device with self-cleaning function according to claim 5, characterized in that: The second cleaning component (4) further includes a push rod (405) and an inclined surface abutting block (407) arranged on the lower side of the filter disc (2). The push rod (405) is slidably connected to the rotating shaft (301). A third elastic member (406) is fixedly connected to one end of the push rod (405) located inside the rotating shaft (301). The inclined surface abutting block (407) is fixedly connected to the top of the filter disc (2) and is located below the knife sheath (402). The first elastic member (403) and the second elastic member (404) are both fixedly connected to the filter disc (2).

7. The multi-stage sewage filtration device with self-cleaning function according to claim 6, characterized in that: A corner of the push rod (405) close to the inclined surface stop block (407) is set as an inclined surface. When the push rod (405) rotates, it will conflict with the bottom block of the knife sleeve (402), and then move to the inclined surface stop block (407) and conflict with the inclined surface stop block (407). The push rod (405) is limited by the inclined surface stop block (407) and moves downward to pass the stop block at the bottom of the knife sleeve (402).

8. The multi-stage sewage filtration device with self-cleaning function according to claim 2, characterized in that: When the rotating shaft (301) drives the cleaning brush (304) to rotate to the opening of the filter disc (2), the cleaning brush (304) is limited by the water retaining plate and gradually rises along the retaining plate. After passing over the water retaining plate, it is pushed downward by the elastic pressure plate (303) and then contacts the scraper (401).

9. The multi-stage sewage filtration device with self-cleaning function according to claim 1, characterized in that: The water delivery assembly (5) comprises a water delivery trough (501) provided inside the main housing (1) and a water diversion notch (503) provided on the outer edge of the filter disc (2); a guide plate (502) is fixedly connected to the middle of the water delivery trough (501); and a discharge outlet (504) is provided at the lower end of the main housing (1).

10. The multi-stage sewage filtration device with self-cleaning function according to claim 9, characterized in that: The water trough (501) is located on a side of the main body shell (1) away from the slag discharge channel (6); the guide plate (502) is inclined downward toward the middle of the filter disc (2); the water diversion notch (503) corresponds to the position of the water trough (501), and the outer edge of the filter disc (2) at the bottom is not provided with a water diversion notch (503).

Images