Sewage treatment device for sponge city
By using a layered filter design and an automatic cleaning system, the problem of filter clogging in the sewage treatment equipment of sponge cities has been solved, achieving efficient sewage treatment and reducing manual cleaning costs.
Patent Information
- Application Number
- CN202511708604.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-20
- Publication Date
- 2026-01-09
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In existing sponge city wastewater treatment devices, the filter screens are prone to clogging due to silt and sediment, resulting in reduced treatment efficiency and high manual cleaning costs, which affects the wastewater treatment effect.
The system employs a layered filter design, combined with a drive motor, gears, servo motor, and vibration components, to achieve automatic cleaning and sludge separation of the filter. By switching between large and small pore sizes and using vibration cleaning, the filter pores are kept clear at all times.
It improves wastewater treatment efficiency, reduces manual cleaning costs, keeps the filter screen clear, and ensures the continuity and efficiency of wastewater treatment.
Smart Images
Figure CN121288397A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of sponge city sewage treatment, in particular to a sewage treatment device for sponge city. BACKGROUND
[0002] A sponge city refers to a city that has good flexibility in adapting to environmental changes and coping with natural disasters caused by rainwater, etc. Specifically, a sponge city optimizes and improves the function of the urban water system through various technical approaches such as infiltration, detention, storage, purification, use, and drainage, so that the city can effectively absorb, store, infiltrate, and purify water when it rains, and release and utilize the stored water when needed, thereby achieving multiple goals such as alleviating urban waterlogging, reducing runoff pollution, saving water resources, and improving the urban ecological environment.
[0003] The existing sponge city needs to recycle sewage, which is generally treated by a filter screen. However, sewage contains a large amount of sand and sludge. If the filter screen is not cleaned in time, it will be blocked after a period of time, at which time the sewage cannot be effectively treated. However, manual cleaning of the filter screen not only increases labor costs but also cannot continue to treat sewage during the cleaning process, thereby affecting the efficiency of sewage treatment. SUMMARY
[0004] The purpose of the present application is to provide a sewage treatment device for sponge city, which solves the problem of increasing labor costs and affecting the efficiency of sewage treatment by manually cleaning the filter screen.
[0005] To achieve the above purpose, the present application provides the following technical scheme: a sewage treatment barrel and a baffle fixedly installed on the sewage treatment barrel, a discharge chute is formed on the rear side wall of the sewage treatment barrel, an installation groove is formed on the front side wall of the sewage treatment barrel, a discharge plate is fixedly installed on the rear side wall of the sewage treatment barrel, characterized in that: a filter assembly for filtering sewage is arranged on the installation groove, and a rotating assembly for switching the filter assembly is arranged on the side wall of the sewage treatment barrel.
[0006] A breaking assembly for breaking sludge entering the filter assembly is arranged on the side wall of the sewage treatment barrel, a cleaning assembly for cleaning the holes of the filter assembly is arranged on the breaking assembly, and a vibrating assembly for shaking the sludge on the filter assembly is arranged on the side wall of the sewage treatment barrel.
[0007] Further, the filtering assembly comprises a layered filtering screen rotatably mounted on the mounting groove, a first cavity is formed on the layered filtering screen, a connecting rod is fixedly mounted on the first cavity, a plurality of large-aperture filtering holes are formed on the left side of the layered filtering screen by 180 degrees, and a plurality of small-aperture filtering holes are formed on the right side of the layered filtering screen by 180 degrees.
[0008] Further, the rotating assembly comprises a support rod fixedly mounted on the side wall of the sewage treatment barrel, a driving motor is fixedly mounted on the side wall of the support rod, a tooth block plate is fixedly mounted on the axial side wall of the layered filtering screen, a first gear is fixedly mounted on the output end of the driving motor, and the first gear is engaged with the tooth block plate.
[0009] Further, the smashing assembly comprises a mounting hole formed on the layered filtering screen, a fixing rod is fixedly mounted on the side wall of the sewage treatment barrel, a first sliding groove is formed on the fixing rod, a rotating shaft is rotatably mounted between the mounting hole and the connecting rod, a second gear is fixedly mounted on the axial side wall of the rotating shaft, a rack rod is slidingly mounted on the first sliding groove, the second gear is engaged with the rack rod, a servo motor is fixedly mounted on the side wall of the support rod, a fixed plate is fixedly mounted on the side wall of the rack rod, two second sliding grooves are formed on the fixed plate, a fixed block is slidingly mounted on the two second sliding grooves, a displacement rod is fixedly mounted on the output end of the servo motor, and the displacement rod is rotatably connected with the fixed block.
[0010] Further, the cleaning assembly comprises a plurality of stirring blades fixedly mounted on the axial side wall of the rotating shaft, four first connecting rods and four second connecting rods are fixedly mounted on the axial side wall of the rotating shaft, an upper cleaning rod is fixedly mounted between the first connecting rods and the second connecting rods, and lower cleaning rods are fixedly mounted on the lower ends of the first connecting rods and the second connecting rods.
[0011] Further, the vibrating assembly comprises a hitting rod fixedly mounted on the side wall of the first gear, two limiting blocks are fixedly mounted on the side wall of the sewage treatment barrel, a rotating shaft is rotatably mounted on the side walls of the two limiting blocks, an arc-shaped rod is fixedly mounted on the axial side wall of the rotating shaft, and torsional springs are arranged between the arc-shaped rod and the two limiting blocks.
[0012] Further, the small-aperture filtering holes are always located at the lower ends of the large-aperture filtering holes.
[0013] Further, the tooth block plate is only half of the layered filtering screen.
[0014] Further, the hitting rod can contact with the arc-shaped rod when rotating.
[0015] Further, the upper cleaning rod and the lower cleaning rod are respectively attached to the inner wall of the layered filter screen.
[0016] Compared with the prior art, the present application has the following advantages:
[0017] 1. Under the cooperation of the driving motor, the first gear and the toothed plate, the toothed plate can be driven to rotate, thereby driving the layered filter screen to rotate. Firstly, the large-aperture filter hole can be cleaned, and secondly, the large-aperture filter hole can be switched through rotation, so that the large-aperture filter hole is always in an unobstructed state, thereby improving the effect of sewage treatment. Since the toothed plate is only half, it cannot be rotated due to the discharge plate, and when the toothed plate collides with the discharge plate, it indicates that the layered filter screen has reached 180, at which time the driving motor needs to be reversed, so that the large-aperture filter hole is always located at the upper end of the small-aperture filter hole, thereby improving the efficiency of sewage treatment.
[0018] 2. Firstly, the urban sewage flows into the sewage treatment barrel through the baffle. The height of the baffle can prevent the sewage from bouncing out of the sewage treatment barrel when it contacts the layered filter screen. Under the cooperation of the layered filter screen, the large-aperture filter hole and the small-aperture filter hole, the sewage can be stratified and isolated. The large-particle sludge impurities will be displaced out along the discharge plate. The discharge chute can meet the discharge of large-particle sludge impurities, and then a part of the small-particle sludge impurities will be isolated by the small-aperture filter hole, thereby completing the treatment of the sewage.
[0019] 3. Under the cooperation of the servo motor, the displacement rod, the fixed block, the second sliding groove, the rack rod, the first sliding groove and the second gear, the rotating shaft and the stirring blade are driven to rotate in opposite directions. The stirring blade can shear the sludge, thereby improving the effect of sewage treatment. The first connecting rod, the second connecting rod, the upper cleaning rod and the lower cleaning rod can reciprocate on the layered filter screen through the rotating shaft, thereby cleaning the large-aperture filter hole and the small-aperture filter hole, avoiding the blockage of the filter hole and affecting the efficiency of sewage treatment.
[0020] 4. Under the cooperation of the driving motor, the striking rod, the arc-shaped rod, the sewage treatment barrel and the torsional spring, the arc-shaped rod strikes the sewage treatment barrel, and the vibration generated thereby is transmitted to the layered filter screen. The first gear has only one tooth block, which can displace the toothed plate once in one rotation, and can be rotated multiple times, thereby driving the striking rod to strike the arc-shaped rod multiple times, making the vibration effect more obvious, thereby causing the sludge on the layered filter screen to fall off. The upper cleaning rod can cooperate to more efficiently clean the layered filter screen, thereby improving the effect of sewage treatment. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1The overall structure of the present application is shown in the figure.
[0022] Figure 2 The side view of the overall structure of the present application is shown in the figure.
[0023] Figure 3 The structure of the rotating assembly of the present application is shown in the figure.
[0024] Figure 4 The structure of the filtering assembly of the present application is shown in the figure.
[0025] Figure 5 The structure of the breaking assembly of the present application is shown in the figure.
[0026] Figure 6 The structure of the cleaning assembly of the present application is shown in the figure. Figure 5 The enlarged view of A of the present application is shown in the figure.
[0027] Figure 7 The structure of the cleaning assembly of the present application is shown in the figure.
[0028] Figure 8 The partial structure of the cleaning assembly of the present application is shown in the figure.
[0029] Figure 9 The structure of the vibrating assembly of the present application is shown in the figure.
[0030] Figure 10 The enlarged view of B of the present application is shown in the figure. Figure 9
[0031] In the figure: 1, sewage treatment barrel; 11, baffle; 12, discharge chute; 13, mounting groove; 14, discharging plate; 2, filtering assembly; 3, rotating assembly; 4, breaking assembly; 5, cleaning assembly; 6, vibrating assembly; 21, layered filter screen; 22, first chamber; 23, connecting rod; 24, large aperture filter hole; 25, small aperture filter hole; 31, support rod; 32, driving motor; 33, tooth block plate; 34, first gear; 41, mounting hole; 42, fixed rod; 43, first sliding groove; 44, rotating shaft; 45, second gear; 46, rack rod; 47, fixed plate; 48, second sliding groove; 49, servo motor; 401, displacement rod; 402, fixed block; 51, stirring blade; 52, first connecting rod; 53, second connecting rod; 54, upper cleaning rod; 55, lower cleaning rod; 61, hitting rod; 62, limiting block; 63, rotating shaft; 64, arc-shaped rod; 65, torsional spring. DETAILED DESCRIPTION
[0032] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present application.
[0033] To solve the technical problem of sewage separation of urban sewage, such as Figures 1-4 As shown, the following preferred technical solutions are provided: a sewage treatment device for sponge city, comprising a sewage treatment barrel 1 and a baffle 11 fixedly installed on the sewage treatment barrel 1, the baffle 11 can prevent the sewage from flying everywhere when entering the sewage treatment barrel 1, a discharge chute 12 is formed on the rear side wall of the sewage treatment barrel 1, an installation groove 13 is formed on the front side wall of the sewage treatment barrel 1, a discharging plate 14 is fixedly installed on the rear side wall of the sewage treatment barrel 1, the length of the discharging plate 14 is long enough to prevent the sewage from dripping on the servo motor 49 and the driving motor 32, characterized in that: the installation groove 13 is provided with a filtering assembly 2 for filtering the sewage, and the side wall of the sewage treatment barrel 1 is provided with a rotating assembly 3 for switching the filtering assembly 2.
[0034] The side wall of the sewage treatment barrel 1 is provided with a crushing assembly 4 for crushing the sludge entering the filtering assembly 2, the crushing assembly 4 is provided with a cleaning assembly 5 for cleaning the holes of the filtering assembly 2, and the side wall of the sewage treatment barrel 1 is provided with a vibrating assembly 6 for shaking the sludge on the filtering assembly 2 to fall down.
[0035] The filtering assembly 2 comprises a layered filter screen 21 rotatably installed in the installation groove 13, the layered filter screen 21 is designed with one end large and one end small, which can facilitate the discharge of sludge, the layered filter screen 21 is provided with a first chamber 22, the first chamber 22 is fixedly installed with a connecting rod 23, a plurality of large-aperture filter holes 24 are formed on the left side of the layered filter screen 21 at 180 degrees, and a plurality of small-aperture filter holes 25 are formed on the right side of the layered filter screen 21 at 180 degrees.
[0036] The rotating assembly 3 comprises a support rod 31 fixedly installed on the side wall of the sewage treatment barrel 1, the side wall of the support rod 31 is fixedly installed with a driving motor 32, the driving motor 32 can realize forward and reverse rotation, the type of the driving motor 32 is YB2-160L-2, a tooth block plate 33 is fixedly installed on the axial side wall of the layered filter screen 21, a first gear 34 is fixedly installed on the output end of the driving motor 32, and the first gear 34 and the tooth block plate 33 are engaged.
[0037] The small aperture filter hole 25 is always located at the lower end of the large aperture filter hole 24, and the large aperture filter hole 24 is located at the upper end of the small aperture filter hole 25, so that the sewage can be filtered multiple times, and the large-particle sewage impurities can be discharged along the discharge plate 14, and the small-particle sewage impurities can be discharged outward along the first chamber 22, so that the sewage treatment can be completed.
[0038] The tooth block plate 33 is only half of the layered filter screen 21, and the tooth block plate 33 can just meet the rotation of the layered filter screen 21 by 180 degrees, so that the large aperture filter hole 24 is always located at the upper end of the small aperture filter hole 25, and in this way, the filter hole can be cleaned, and the filter hole is always in a dredged state.
[0039] Specific implementation: first, the municipal sewage flows to the sewage treatment barrel 1 through the baffle 11, and the height of the baffle 11 can prevent the sewage from bouncing out of the sewage treatment barrel 1 when it contacts the layered filter screen 21, because the layered filter screen 21 adopts a large aperture filter hole 24 at the upper part and a small aperture filter hole 25 at the lower part, so that the sewage can be layered and isolated, and the large-particle sludge impurities can be displaced out along the discharge plate 14, and the discharge chute 12 can meet the discharge of the large-particle sludge impurities, and then a part of the small-particle sludge impurities can be isolated by the small aperture filter hole 25, so that the sewage treatment can be completed, and at the same time of the sewage treatment, the driving motor 32 is started, so that the output end of the driving motor 32 drives the first gear 34 to rotate, because the first gear 34 is engaged with the tooth block plate 33, so that the tooth block plate 33 can be driven to rotate and drive the layered filter screen 21 to rotate, which can clean the large aperture filter hole 24, and can switch the large aperture filter hole 24 through the rotating mode, so that the large aperture filter hole 24 is always in a smooth state, thereby improving the effect of sewage treatment, and the tooth block plate 33 is only half, so it cannot rotate because of the discharge plate 14, and when the tooth block plate 33 is in contact with the discharge plate 14, it indicates that the layered filter screen 21 has been rotated by 180 degrees, at this time, the driving motor 32 needs to be reversed, so that the large aperture filter hole 24 is always located at the upper end of the small aperture filter hole 25, thereby improving the treatment efficiency of the sewage.
[0040] In order to solve the technical problem of filter screen blockage caused by sludge, like Figures 5-8As shown, the following preferred technical solutions are provided: the breaking assembly 4 comprises a mounting hole 41 formed on the layered filter screen 21, a fixed rod 42 is fixedly installed on the side wall of the sewage treatment barrel 1, a first sliding groove 43 is formed on the fixed rod 42, a rotating shaft 44 is rotatably installed between the mounting hole 41 and the connecting rod 23, a second gear 45 is fixedly installed on the axial side wall of the rotating shaft 44, a rack rod 46 is slidably installed on the first sliding groove 43, the second gear 45 and the rack rod 46 are engaged, a servo motor 49 is fixedly installed on the side wall of the support rod 31, a fixed plate 47 is fixedly installed on the side wall of the rack rod 46, two second sliding grooves 48 are formed on the fixed plate 47, and a fixed block 402 is slidably installed on the two second sliding grooves 48. The output end of the servo motor 49 is fixedly installed with a displacement rod 401, and the displacement rod 401 is rotatably connected with the fixed block 402.
[0041] The cleaning assembly 5 comprises a plurality of stirring blades 51 fixedly installed on the axial side wall of the rotating shaft 44, the stirring blades 51 have only upper and lower three blades, and there is a certain gap between each blade, so that the stirring blades 51 are not blocked while breaking the sludge, four first connecting rods 52 and four second connecting rods 53 are fixedly installed on the axial side wall of the rotating shaft 44, an upper cleaning rod 54 is fixedly installed between the first connecting rod 52 and the second connecting rod 53, and a lower cleaning rod 55 is fixedly installed at the lower end of the first connecting rod 52 and the second connecting rod 53. The upper and lower cleaning rods 54 and 55 are in the shape of a gap in the middle, which can avoid blocking the filter holes.
[0042] The upper and lower cleaning rods 54 and 55 are respectively attached to the inner wall of the layered filter screen 21, when the servo motor 49 drives the rotating shaft 44 to rotate through the rotating assembly 3, the upper and lower cleaning rods 54 and 55 are driven to rotate, thereby cleaning the layered filter screen 21.
[0043] Specific implementation: the sewage contains a large amount of impurities, which will cause the filter screen to be blocked, at this time, the servo motor 49 is started, the output end of the servo motor 49 drives the displacement rod 401 to rotate, thereby driving the fixed block 402 to slide on the two second sliding grooves 48, then driving the rack rod 46 to reciprocate on the first sliding groove 43, because the teeth on the rack rod 46 are engaged with the second gear 45, the second gear 45 is driven to rotate in forward and reverse directions, thereby driving the rotating shaft 44 and the stirring blades 51 to rotate in forward and reverse directions, the stirring blades 51 can shear the sludge, thereby improving the sewage treatment effect, the first connecting rod 52, the second connecting rod 53, the upper cleaning rod 54 and the lower cleaning rod 55 are driven to reciprocate on the layered filter screen 21 through the rotating shaft 44, thereby cleaning the large-aperture filter holes 24 and the small-aperture filter holes 25, avoiding the blockage of the filter holes and affecting the efficiency of the sewage treatment.
[0044] In order to solve the technical problem that the sludge on the filter hole cannot be cleaned by the cleaning rod, like Figures 9-10 As shown in the preferred technical scheme: the vibration assembly 6 includes a knocking rod 61 fixedly installed on the side wall of the first gear 34, two limiting blocks 62 are fixedly installed on the side wall of the sewage treatment barrel 1, a rotating shaft 63 is rotatably installed on the side wall of the two limiting blocks 62, an arc-shaped rod 64 is fixedly installed on the axial side wall of the rotating shaft 63, a torsional spring 65 is arranged between the arc-shaped rod 64 and the two limiting blocks 62, and the first gear 34 has only one tooth block. The tooth block plate 33 can be displaced once when the first gear 34 rotates one circle, and can be rotated multiple times, so as to drive the knocking rod 61 to knock the arc-shaped rod 64 multiple times, so that the vibration effect is more obvious, and the sludge on the layered filter screen 21 is shaken off.
[0045] When the knocking rod 61 rotates, it can contact the arc-shaped rod 64. When the driving motor 32 drives the first gear 34 to rotate and rotate the layered filter screen 21, the knocking rod 61 is driven to rotate, and then the knocking rod 61 presses the arc-shaped rod 64, so that one end of the arc-shaped rod 64 is away from the sewage treatment barrel 1. When the force is unloaded, the arc-shaped rod 64 can hit the sewage treatment barrel 1 through the action of the torsional spring 65, the vibration is transmitted to the layered filter screen 21, and the sludge on the layered filter screen 21 is shaken off.
[0046] Specific implementation: when the large-aperture filter hole 24 is mixed with sludge that cannot be cleaned by the upper cleaning rod 54, the knocking rod 61 is driven to rotate under the start of the driving motor 32, and then the knocking rod 61 presses the arc-shaped rod 64, so that one end of the arc-shaped rod 64 is away from the sewage treatment barrel 1. When the force is unloaded, the arc-shaped rod 64 can hit the sewage treatment barrel 1 through the action of the torsional spring 65, the vibration is transmitted to the layered filter screen 21, and the sludge on the layered filter screen 21 is shaken off. The first gear 34 has only one tooth block, which can be displaced once when rotating one circle, and can be rotated multiple times, so as to drive the knocking rod 61 to knock the arc-shaped rod 64 multiple times, so that the vibration effect is more obvious, and the sludge on the layered filter screen 21 is shaken off. The upper cleaning rod 54 can cooperate to more efficiently clean the layered filter screen 21, thereby improving the sewage treatment effect.
[0047] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the scope of the present application is not limited to these specific embodiments.
[0048] While the embodiments of the application have been shown and described herein, it is to be understood that the scope of the application, jointly pointed out in the appended claims, is not to be limited to the above-described embodiments but can be otherwise variously changed, modified, replaced, and altered within the principles and spirit of the present application.
Claims
1. A sewage treatment device for sponge cities, comprising a sewage treatment tank (1) and a baffle (11) fixedly installed on the sewage treatment tank (1), wherein a discharge trough (12) is provided on the rear side wall of the sewage treatment tank (1), an installation groove (13) is provided on the front side wall of the sewage treatment tank (1), and a discharge plate (14) is fixedly installed on the rear side wall of the sewage treatment tank (1), characterized in that: The mounting slot (13) is provided with a filter assembly (2) for filtering sewage, and the side wall of the sewage treatment tank (1) is provided with a rotating assembly (3) for switching the filter assembly (2). The side wall of the sewage treatment tank (1) is provided with a crushing component (4) for crushing the sludge entering the filter assembly (2), the crushing component (4) is provided with a cleaning component (5) for cleaning the holes of the filter assembly (2), and the side wall of the sewage treatment tank (1) is provided with a vibration component (6) for shaking the sludge off the filter assembly (2).
2. A sewage treatment device for sponge cities according to claim 1, characterized in that: The filter assembly (2) includes a layered filter screen (21) rotatably mounted on the mounting groove (13). The layered filter screen (21) has a first chamber (22) and a connecting rod (23) is fixedly mounted on the first chamber (22). The layered filter screen (21) has several large-diameter filter holes (24) at 180 degrees on the left side and several small-diameter filter holes (25) at 180 degrees on the right side.
3. A sewage treatment device for sponge cities according to claim 2, characterized in that: The rotating assembly (3) includes a support rod (31) fixedly installed on the side wall of the sewage treatment tank (1), a drive motor (32) fixedly installed on the side wall of the support rod (31), a toothed plate (33) fixedly installed on the axial side wall of the layered filter screen (21), and a first gear (34) fixedly installed at the output end of the drive motor (32), the first gear (34) and the toothed plate (33) meshing.
4. A sewage treatment device for sponge cities according to claim 3, characterized in that: The crushing component (4) includes a mounting hole (41) on the layered filter screen (21). A fixing rod (42) is fixedly installed on the side wall of the sewage treatment tank (1). A first sliding groove (43) is provided on the fixing rod (42). A rotating shaft (44) is rotatably installed between the mounting hole (41) and the connecting rod (23). A second gear (45) is fixedly installed on the axial side wall of the rotating shaft (44). A rack rod (46) is slidably installed on the first sliding groove (43). (45) meshes with the rack and pinion (46). A servo motor (49) is fixedly installed on the side wall of the support rod (31). A fixing plate (47) is fixedly installed on the side wall of the rack and pinion (46). Two second slide grooves (48) are opened on the fixing plate (47). A fixing block (402) is slidably installed on the two second slide grooves (48). A displacement rod (401) is fixedly installed at the output end of the servo motor (49). The displacement rod (401) is rotatably connected to the fixing block (402).
5. A sewage treatment device for sponge cities according to claim 4, characterized in that: The cleaning assembly (5) includes several stirring blades (51) fixedly installed on the axial sidewall of the rotating shaft (44). Four first connecting rods (52) and four second connecting rods (53) are fixedly installed on the axial sidewall of the rotating shaft (44). An upper cleaning rod (54) is fixedly installed between the first connecting rods (52) and the second connecting rods (53). A lower cleaning rod (55) is fixedly installed at the lower end of the first connecting rods (52) and the second connecting rods (53).
6. A sewage treatment device for sponge cities according to claim 3, characterized in that: The vibration assembly (6) includes a striking rod (61) fixedly installed on the side wall of the first gear (34). Two limiting blocks (62) are fixedly installed on the side wall of the sewage treatment tank (1). A rotating shaft (63) is rotatably installed on the side wall of the two limiting blocks (62). An arc-shaped rod (64) is fixedly installed on the axial side wall of the rotating shaft (63). A torsion spring (65) is provided between the arc-shaped rod (64) and the two limiting blocks (62).
7. A sewage treatment device for sponge cities according to claim 2, characterized in that: The small-aperture filter hole (25) is always located at the lower end of the large-aperture filter hole (24).
8. A sewage treatment device for sponge cities according to claim 3, characterized in that: The toothed plate (33) is only half the size of the layered filter screen (21).
9. A sewage treatment device for sponge cities according to claim 6, characterized in that: The striking rod (61) can come into contact with the arc-shaped rod (64) when it rotates.
10. A sewage treatment device for sponge cities according to claim 5, characterized in that: The upper cleaning rod (54) and the lower cleaning rod (55) are respectively attached to the inner wall of the layered filter screen (21).