Multi-stage filtering device for municipal wastewater

Abstract

The invention discloses a multi-stage filtering device for municipal wastewater, relates to the technical field of wastewater treatment, and solves the problem that the cleaning speed of a winding mechanism is relatively low as arc-shaped hook plates need to be rotated one by one when a worker cleans filaments on the winding mechanism and the operation is relatively complicated. A water inlet pipe communicated with the separation box is fixedly mounted on the left side, close to the upper end, of the separation box, a water drainage pipe communicated with the separation box is fixedly mounted on the right side, close to the lower end, of the separation box, and the separation assembly is used for separating filaments in wastewater and mounted in the separation box; according to the device, the material pushing mechanism and the driving assembly are installed, so that the multiple material blocking rods can be quickly separated from filaments at the same time, the filaments and impurities separated from the inclined flow guide disc can be conveniently pushed off by the material pushing plate, and the filaments and the impurities on the inclined flow guide disc can be conveniently and quickly cleaned.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a multi-stage filtering device for urban wastewater. Background Art

[0002] Wastewater treatment is to treat wastewater using physical, chemical and biological methods to purify wastewater, reduce pollution, and even recycle and reuse wastewater to make full use of water resources. When recycling wastewater, multi-stage filtration equipment will be used to filter the wastewater. The multi-stage filtration equipment will first perform coarse filtration on the wastewater.

[0003] The multi-stage filtration equipment for urban wastewater on the market will first remove impurities such as filaments in the sewage that are easy to entangle through a winding mechanism when filtering urban wastewater, so as to prevent the filter screen in the filtration equipment from being entangled and blocked by impurities such as filaments. The winding mechanism is composed of multiple winding rods and multiple arc-shaped hook plates, which are rotatably installed on the outside of the winding rods. The winding rods drive the arc-shaped hook plates to rotate to hook the filaments, etc., and a knife plate is also installed at the corresponding arc-shaped hook plate on the winding rod. When cleaning the filaments on the winding mechanism, the personnel rotate the arc-shaped hook plate, and the arc-shaped hook plate squeezes the filaments, etc., so that the knife plate cuts off the filaments, etc. However, during the use of the above device, due to the large number of arc-shaped hook plates, the personnel need to rotate the arc-shaped hook plates one by one when cleaning the filaments on the winding mechanism, which is relatively complicated, resulting in a slow cleaning speed of the winding mechanism, and improper operation may hit the knife plate and cause injury. Summary of the invention

[0004] The object of the present invention is to provide a multi-stage filtering device for urban wastewater to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A multi-stage filtering device for urban wastewater comprises a separation box, a water inlet pipe interconnected with the separation box is fixedly installed on the left side near the upper end of the separation box, and a drainage pipe interconnected with the separation box is fixedly installed on the right side near the lower end of the separation box. The device also comprises a separation component for separating filaments in wastewater, the separation component is installed inside the separation box and is located at the lower side of the water inlet pipe; a pushing mechanism for separating the separated filaments from the separation component, the pushing mechanism is installed on the upper side of the separation mechanism; and a driving component for driving the separation component to move, the driving component is installed between the separation component and the pushing mechanism.

[0006] Preferably, the separation assembly includes an inclined guide plate, which is fixedly connected to the separation box through a plurality of fixing rods, a bracket is installed on the lower side of the inclined guide plate, a plurality of material blocking rods distributed in a staggered manner are fixedly installed on the upper end of the bracket, and the plurality of material blocking rods all pass through the inclined guide plate, and a plurality of positioning rods distributed in an array are fixedly installed on the lower end of the inclined guide plate.

[0007] Preferably, the positioning rod passes through the bracket, and two symmetrically distributed support plates are fixedly installed inside the separation box corresponding to the lower side of the positioning rod, and the lower end of the positioning rod is fixedly connected to the support plate, and the outer side of the positioning rod is movably sleeved with a first spring, and the two ends of the first spring are movably abutted against the bracket and the support plate respectively.

[0008] Preferably, the pushing mechanism includes two threaded rods installed close to the side walls of the inclined guide plate, the two threaded rods are assembled through a synchronous wheel and a synchronous belt transmission, the two inclined guide plates are rotatably connected to the separation box through sealed bearings, and the left end of one of the inclined guide plates is fixedly connected to a drive motor.

[0009] Preferably, the connection between the driving motor and the separation box is a fixed connection, the outer side of the threaded rod is equipped with two symmetrically distributed support seats through bearings, and the connection between the support seat and the inclined guide plate is a fixed connection, the outer sides of the two threaded rods are threadedly equipped with sliders, and the lower ends of the two sliders are fixedly installed with push plates.

[0010] Preferably, two symmetrically distributed support rods are installed on the front and rear sides of the bracket, and a roller is movably sleeved on the outer side of the support rod. The driving assembly includes a driving block installed on the left side of the roller, and a bevel portion is provided on the right side of the driving block. The roller is in rolling contact with the driving block through the bevel portion, and bent connecting rods are installed on the front and rear sides of the inclined guide plate.

[0011] Preferably, the driving block is fixedly sleeved on the outer side of the bending connecting rod, a positioning pin is movably embedded in the driving block, and the positioning pin is located on the upper side of the bending connecting rod, the positioning pin is slidably connected to the driving block through a limiting straight groove, and a second spring and a third spring are movably sleeved on the outer side of the bending connecting rod, and the third spring is located at the right end of the bending connecting rod, and the left ends of the second spring and the third spring are movably abutted against the positioning block.

[0012] Preferably, the positioning block is movably sleeved on the outer side of the bending connecting rod, the connection between the positioning block and the inclined guide plate is a fixed connection, the right end of the second spring is movably abutted against the driving block, the right end of the third spring is movably abutted with a gasket, and the gasket is fixedly connected to the bending connecting rod, a long connecting rod is fixedly installed between the two bending connecting rods near the left end of the bending connecting rod, and the long connecting rod is slidably connected to the inclined guide plate through a reserved straight groove, and the connection between the long connecting rod and the two sliding blocks is a movably abutted connection.

[0013] Preferably, a cleaning assembly is installed on the right side of the slider, and the cleaning assembly is movably sleeved on the outer side of the threaded rod, the cleaning assembly comprises a left semicircular fixing ring and a right semicircular fixing ring that are movably abutted against each other, a wire brush is fixedly installed on the side of the left semicircular fixing ring and the right semicircular fixing ring away from the slider, and the shape of the combination of the two wire brushes is conical, plug-in blocks are fixedly embedded on both ends of the left semicircular fixing ring, and the connection between the plug-in block and the right semicircular fixing ring is plug-in contact, a pin plate and a positioning plate are fixedly installed on the outer sides of the left semicircular fixing ring and the right semicircular fixing ring, a sleeve is movably sleeved on the outer side of the pin plate, and the connection between the sleeve and the slider is a fixed connection, a fixing screw is passed through the positioning plate, and the connection between the fixing screw and the slider is a threaded connection.

[0014] Preferably, a cover plate is installed on the upper side of the two threaded rods, and the connection between the cover plate and the separation box is a fixed connection. A baffle is fixedly installed on the lower side of the inclined guide plate corresponding to its right end, and the connection between the baffle and the separation box is a fixed connection.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention installs a separation component, and the water inlet pipe transports the wastewater to the inclined guide plate in the separation mechanism. The multiple blocking rods on the inclined guide plate that are staggered will block the filaments from flowing with the liquid, thereby achieving the purpose of separating the filaments in the wastewater, and the multiple blocking rods block the filaments so that the filaments cover the upper side of the inclined guide plate, so that when the sewage flows on the inclined guide plate, the filaments can block impurities (such as paper scraps, particulate matter, etc.) in the wastewater from flowing with the wastewater, thereby further separating the impurities in the wastewater and reducing the burden on the filtering equipment.

[0016] 2. The present invention installs a pushing mechanism and a driving assembly. During the process in which the screw in the pushing mechanism drives the material return plate to move to the right, the driving block in the driving assembly will move to the right under the drive of the second spring and the third spring, so that the driving block drives multiple material blocking rods to move downward through the roller, which is beneficial for multiple material blocking rods to quickly disengage from the filaments at the same time, making it convenient for the pushing plate to push down the filaments and impurities separated from the inclined guide plate, thereby facilitating the rapid cleaning of the filaments and impurities on the inclined guide plate.

[0017] 3. The present invention installs a cleaning assembly, and two wire brushes in the cleaning assembly can move along with the slider on the outside of the threaded rod. During the movement, the wire brushes are in frictional contact with the threaded rod, and can brush away paper scraps, sludge, etc. splashed on the threaded rod, thereby effectively avoiding the phenomenon that the slider is stuck due to paper scraps, sludge, etc. attached to the threaded rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of the present invention; Figure 2 It is a side sectional schematic diagram of the present invention; Figure 3 It is a schematic diagram of the overall internal structure of the separation box of the present invention; Figure 4 It is an overall schematic diagram of the separation assembly of the present invention; Figure 5 It is an overall schematic diagram of the material pushing mechanism of the present invention; Figure 6 This is a schematic diagram of the cleaning component and the slider being separated according to the present invention; Figure 7 It is a schematic diagram of the connection between the pusher mechanism, the drive assembly and the separation assembly of the present invention; Figure 8 It is an overall schematic diagram of the drive assembly of the present invention.

[0019] In the figure: 1. separation box; 2. water inlet pipe; 3. drain pipe; 4. inclined guide plate; 5. fixing rod; 6. bracket; 7. material blocking rod; 8. positioning rod; 9. support plate; 10. first spring; 11. support rod; 12. roller; 13. drive block; 14. bevel; 15. bent connecting rod; 16. positioning pin; 17. second spring; 18. third spring; 19. positioning block; 20. gasket; 21. long connecting rod; 22. reserved straight groove; 23. threaded rod; 24. drive motor; 25. support seat; 26. slider; 27. push plate; 28. left semicircle fixing ring; 29. ​​right semicircle fixing ring; 30. wire brush; 31. plug-in block; 32. pin plate; 33. sleeve; 34. positioning plate; 35. fixing screw; 36. cover plate; 37. baffle. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figure 1-Figure 4 A multi-stage filtering device for urban wastewater shown in the figure includes a separation box 1, which is used for pre-treating urban wastewater. A water inlet pipe 2 connected to the separation box 1 is fixedly installed on the left side near the upper end thereof, and a drainage pipe 3 connected to the separation box 1 is fixedly installed on the right side near the lower end thereof. Urban wastewater enters the separation box 1 through the water inlet pipe 2 and is then discharged from the separation box 1 through the drainage pipe 3. A separation component is also included for separating filaments in the wastewater. The separation component is installed inside the separation box 1 and is located at the lower side of the water inlet pipe 2.

[0022] The separation assembly includes an inclined guide plate 4, which is used to convey sewage. The inclined guide plate 4 is fixedly connected to the separation box 1 through multiple fixing rods 5, and the fixing rods 5 are used to support the inclined guide plate 4. A bracket 6 is installed on the lower side of the inclined guide plate 4, and multiple blocking rods 7 distributed in an alternating manner are fixedly installed on the upper end of the bracket 6. The bracket 6 is used to make the multiple blocking rods 7 form a whole, and the multiple blocking rods 7 all pass through the inclined guide plate 4. The blocking rods 7 are used to prevent filaments in the sewage from flowing down from the inclined guide plate 4. The lower end of the inclined guide plate 4 is fixedly installed with multiple positioning rods 8 distributed in an array.

[0023] Example 2: Please refer to Figure 3 , Figure 7 , Figure 8 This embodiment further explains the first embodiment, the positioning rod 8 passes through the bracket 6, and two symmetrically distributed support plates 9 are fixedly installed inside the separation box 1 corresponding to the lower side of the positioning rod 8, and the lower end of the positioning rod 8 is fixedly connected to the support plate 9, and the outer side of the positioning rod 8 is movably sleeved with a first spring 10, and the two ends of the first spring 10 are movably abutted against the bracket 6 and the support plate 9 respectively, and the support plate 9 supports the bracket 6 through the positioning rod 8 and the first spring 10.

[0024] The pushing mechanism is used to make the separated filaments separate from the separation component. The pushing mechanism is installed on the upper side of the separation mechanism. The pushing mechanism includes two threaded rods 23 installed near the side walls of the inclined guide plate 4. The two threaded rods 23 are assembled through a synchronous wheel and a synchronous belt transmission. The two inclined guide plates 4 are rotatably connected to the separation box 1 through sealed bearings. The left end of one inclined guide plate 4 is fixedly connected to a drive motor 24, and the drive motor 24 is used to drive the threaded rods 23 to rotate forward or reverse.

[0025] The connection between the driving motor 24 and the separation box 1 is a fixed connection. The outer side of the threaded rod 23 is equipped with two symmetrically distributed support seats 25 through bearings, and the connection between the support seats 25 and the inclined guide plate 4 is a fixed connection. The support seats 25 are used to position and support the threaded rod 23. The outer sides of the two threaded rods 23 are threadedly equipped with sliders 26. The lower ends of the two sliders 26 are fixedly installed with push plates 27. The threaded rod 23 can drive the push plates 27 to move back and forth left and right on the inclined guide plate 4 through the sliders 26.

[0026] Two symmetrically distributed support rods 11 are installed on both the front and rear sides of the bracket 6, and a roller 12 is movably sleeved on the outer side of the support rod 11; A driving assembly is used to drive the separation assembly to move. The driving assembly is installed between the separation assembly and the pushing mechanism. The driving assembly includes a driving block 13 installed on the left side of the roller 12. A bevel portion 14 is provided on the right side of the driving block 13. The roller 12 is in rolling contact with the driving block 13 through the bevel portion 14. The driving block 13 can drive the bracket 6 and multiple material blocking rods 7 to move downward through the bevel portion 14 and the support rod 11. The roller 12 is used to reduce the friction resistance between the support rod 11 and the driving block 13. Bending connecting rods 15 are installed on the front and rear sides of the inclined guide plate 4.

[0027] The driving block 13 is fixedly sleeved on the outer side of the bending link 15, and a positioning pin 16 is movably embedded on the driving block 13, and the positioning pin 16 is located on the upper side of the bending link 15, and the positioning pin 16 is slidably connected to the driving block 13 through a limiting straight groove, and the outer side of the bending link 15 is movably sleeved with a second spring 17 and a third spring 18, and the third spring 18 is located at the right end of the bending link 15, and the left ends of the second spring 17 and the third spring 18 are movably abutted against a positioning block 19.

[0028] The positioning block 19 is movably sleeved on the outer side of the bending link 15, and the connection between the positioning block 19 and the inclined guide plate 4 is a fixed connection. The right end of the second spring 17 is movably abutted against the driving block 13, and the right end of the third spring 18 is movably abutted with a gasket 20, and the gasket 20 is fixedly connected to the bending link 15, and the gasket 20 is used to block the right end of the third spring 18. The second spring 17 and the third spring 18 can drive the bending link 15 and the driving block 13 to move rightward through the positioning block 19. A long connecting rod 21 is fixedly installed between the two bending links 15 near the left end of the bending link 15, and the long connecting rod 21 is slidably connected to the inclined guide plate 4 through a reserved straight groove 22. The connection between the long connecting rod 21 and the two sliders 26 is movably abutted, and the two sliders 26 can drive multiple driving blocks 13 to move leftward through the long connecting rod 21 and the bending link 15.

[0029] Example 3: Please refer to Figure 5, Figure 6 , this embodiment further explains the first embodiment, a cleaning assembly is installed on the right side of the slider 26, and the cleaning assembly is movably sleeved on the outer side of the threaded rod 23, the cleaning assembly includes a left semicircular fixing ring 28 and a right semicircular fixing ring 29 that are movably opposed to each other, and a wire brush 30 is fixedly installed on the side of the left semicircular fixing ring 28 and the right semicircular fixing ring 29 away from the slider 26, the left semicircular fixing ring 28 and the right semicircular fixing ring 29 are used to fix the wire brush 30, and the combination of the two wire brushes 30 is conical in shape, and the conical shape of the combination of the two wire brushes 30 can prevent impurities from accumulating inside the wire brush 30, and both ends of the left semicircular fixing ring 28 are fixedly embedded with plug-in blocks 31, and the connection method between the plug-in block 31 and the right semicircular fixing ring 29 is plug-in connection The insertion of the plug-in block 31 into the right semicircular fixing ring 29 can enhance the connection strength between the left semicircular fixing ring 28 and the right semicircular fixing ring 29. The outer sides of the left semicircular fixing ring 28 and the right semicircular fixing ring 29 are fixedly installed with a pin plate 32 and a positioning plate 34. The outer side of the pin plate 32 is movably sleeved with a sleeve seat 33, and the connection method between the sleeve seat 33 and the slider 26 is a fixed connection. The pin plate 32 is inserted into the sleeve seat 33, which can position the upper half of the left semicircular fixing ring 28 and the right semicircular fixing ring 29. The positioning plate 34 is penetrated by a fixing screw 35, and the connection method between the fixing screw 35 and the slider 26 is a threaded connection. The fixing screw 35 can position the lower half of the left semicircular fixing ring 28 and the right semicircular fixing ring 29 through the positioning plate 34.

[0030] Example 4: Please refer to Figure 2 This embodiment further explains Example 3. A cover plate 36 is installed on the upper side of the two threaded rods 23, and the connection between the cover plate 36 and the separation box 1 is a fixed connection. A baffle 37 is fixedly installed on the lower side of the inclined guide plate 4 corresponding to its right end, and the connection between the baffle 37 and the separation box 1 is a fixed connection. The cover plate 36 and the baffle 37 are used to prevent sewage containing a large amount of impurities from flowing to the lower side of the inclined guide plate 4.

[0031] Working principle: the water inlet pipe 2 transports the sewage to the inclined guide plate 4 in the separation box 1. When the sewage flows on the inclined guide plate 4, the filaments in the sewage will be blocked by a plurality of staggered blocking rods 7. The sewage with the filaments filtered out will be discharged from the separation box 1 through the drain pipe 3 and enter the next filtration link. When the filaments on the inclined guide plate 4 accumulate to a certain extent, when the sewage flows on the surface of the filaments, the particulate matter, flocs, etc. in the sewage will be blocked by the filaments and remain on the inclined guide plate 4, so that the filaments, particulate matter, etc. in the sewage can be preliminarily separated through the separation component, which can effectively reduce the burden of the subsequent filtering mechanism.

[0032] When it is necessary to clean the filaments on the inclined guide plate 4, the personnel controls the drive motor 24 to run, and under the action of the synchronous wheel and the synchronous belt, the two threaded rods 23 rotate through the slider 26 to drive the push plate 27 to move to the right. In the process of the two sliders 26 moving to the right, the bent connecting rod 15 and the drive block 13 will move to the right under the drive of the compression elastic force of the second spring 17 and the third spring 18. In the process of the drive block 13 moving to the right, the drive block 13 will drive the roller 12 and multiple blocking rods 7 to move downward through the bevel portion 14 until the upper end surfaces of the multiple blocking rods 7 are flush with the upper end surface of the inclined guide plate 4, which is conducive to allowing the multiple blocking rods 7 to quickly break away from the filaments. The push plate 27 then continues to move to the right. In the process of the push plate 27 moving to the right, the filaments accumulated on the inclined guide plate 4 can be pushed off the inclined guide plate 4, which is beneficial to quickly clean the filaments on the inclined guide plate 4; when the push plate 27 moves to the rightmost end, the drive motor 24 drives the threaded rod 23 to rotate in the opposite direction, so that the slider 26 and the push plate 27 move back and reset. In the process of the slider 26 moving back and resetting, the slider 26 will resist the long connecting rod 21 and drive the bent connecting rod 15 and the driving block 13 to move left through the long connecting rod 21. In the process of the driving block 13 moving to the left, the multiple material blocking rods 7 will move up and reset under the drive of the compression elastic force of the first spring 10.

[0033] When the water inlet pipe 2 discharges sewage onto the inclined guide plate 4, the sewage will splash due to the collision with the inclined guide plate 4, so impurities such as paper scraps and sludge will splash onto the threaded rod 23. In the process of the threaded rod 23 rotating to drive the slider 26 to move to the right, the threaded rod 23 will be in rotational contact with the two wire brushes 30. The wire brush 30 can brush off the impurities attached to the surface of the threaded rod 23 during the rotation of the threaded rod 23, and can effectively prevent the impurities attached to the surface of the threaded rod 23 from causing the slider 26 to get stuck; when the wire brush 30 needs to be replaced, the personnel first removes the two fixing screws 35, then moves the pin plate 32 out of the sleeve 33, and finally separates the left semicircular fixing ring 28 and the right semicircular fixing ring 29, and the wire brush 30 can be removed and replaced.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although embodiments of the present invention have been described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage filtering device for urban wastewater, comprising a separation box (1), a water inlet pipe (2) being installed on the left side of the separation box (1), and a drainage pipe (3) being installed on the right side of the separation box (1), characterized in that: Also includes: A separation component, used for separating the filaments in the wastewater, the separation component being installed inside the separation box (1) and located at the lower side of the water inlet pipe (2); A pushing mechanism, used to separate the separated filaments from the separation assembly, the pushing mechanism being installed on the upper side of the separation mechanism; The driving assembly is used to drive the separation assembly to move, and the driving assembly is installed between the separation assembly and the pushing mechanism.

2. A multi-stage filtration device for urban wastewater according to claim 1, characterized in that: The separation assembly comprises an inclined guide plate (4), the inclined guide plate (4) being connected to the separation box (1) via a plurality of fixing rods (5), a bracket (6) being installed on the lower side of the inclined guide plate (4), a plurality of material blocking rods (7) being installed on the upper end of the bracket (6), and the plurality of material blocking rods (7) all pass through the inclined guide plate (4), and a plurality of positioning rods (8) being installed on the lower end of the inclined guide plate (4).

3. A multi-stage filtration device for urban wastewater according to claim 2, characterized in that: The positioning rod (8) passes through the bracket (6), two support plates (9) are installed inside the separation box (1), and the positioning rod (8) is connected to the support plates (9), and a first spring (10) is sleeved on the outer side of the positioning rod (8).

4. A multi-stage filtration device for urban wastewater according to claim 2, characterized in that: The pushing mechanism comprises a threaded rod (23), the two inclined guide plates (4) are connected to the separation box (1) via a sealed bearing, and one end of one of the inclined guide plates (4) is connected to a drive motor (24).

5. A multi-stage filtration device for urban wastewater according to claim 4, characterized in that: Two support seats (25) are mounted on the outer side of the threaded rod (23), and sliding blocks (26) are mounted on the outer sides of the two threaded rods (23). Pushing plates (27) are mounted on the lower ends of the two sliding blocks (26).

6. A multi-stage filtration device for urban wastewater according to claim 5, characterized in that: A support rod (11) is mounted on the outer side of the bracket (6), a roller (12) is sleeved on the outer side of the support rod (11), the drive assembly comprises a drive block (13), a bevel portion (14) is arranged on the outer side of the drive block (13), and the roller (12) is in rolling contact with the drive block (13) via the bevel portion (14), and a bent connecting rod (15) is mounted on the outer side of the inclined guide plate (4).

7. A multi-stage filtration device for urban wastewater according to claim 6, characterized in that: The driving block (13) is sleeved on the outer side of the bending connecting rod (15); a positioning pin (16) is embedded in the driving block (13); a second spring (17) and a third spring (18) are sleeved on the outer side of the bending connecting rod (15); the left ends of the second spring (17) and the third spring (18) are both in contact with a positioning block (19).

8. A multi-stage filtration device for urban wastewater according to claim 7, characterized in that: The positioning block (19) is sleeved on the outer side of the bending connecting rod (15); the connection between the positioning block (19) and the inclined guide plate (4) is a fixed connection; one end of the second spring (17) is movably abutted against the driving block (13); one end of the third spring (18) is abutted against a gasket (20); and the gasket (20) is fixedly connected to the bending connecting rod (15); a long connecting rod (21) is installed between the two bending connecting rods (15); and the connection between the long connecting rod (21) and the two sliding blocks (26) is a movably abutted connection.

9. The multi-stage filtration device for urban wastewater according to claim 5, characterized in that: A cleaning assembly is installed on the right side of the slider (26), and the cleaning assembly is movably sleeved on the outer side of the threaded rod (23). The cleaning assembly comprises a left semicircular fixing ring (28) and a right semicircular fixing ring (29). A wire brush (30) is installed on one side of the left semicircular fixing ring (28) and the right semicircular fixing ring (29), and the combination of the two wire brushes (30) is conical in shape. Plug-in blocks (31) are embedded at both ends of the left semicircular fixing ring (28). Pin plates (32) and positioning plates (34) are installed on the outer sides of the left semicircular fixing ring (28) and the right semicircular fixing ring (29). A sleeve seat (33) is sleeved on the outer side of the pin plate (32), and a fixing screw (35) is passed through the positioning plate (34).

10. A multi-stage filtration device for urban wastewater according to claim 9, characterized in that: A cover plate (36) is installed on the upper side of the two threaded rods (23), and a baffle plate (37) is fixedly installed on the lower side of the inclined guide plate (4) corresponding to the right end thereof.

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