Sewage circulating treatment device and treatment process

Abstract

The invention relates to the technical field of sewage treatment, and provides a sewage circulation treatment device which comprises a first filter box, a second filter box, a first filter screen and a second filter screen, the outlet end of the first filter box is communicated with the upper end of the second filter box, the first filter screen is vertically arranged in the first filter box, and the second filter screen is horizontally arranged in the second filter box; a mounting frame is slidably connected to the second filter box in the horizontal direction, a cleaning opening is formed in one side of the second filter box, the mounting frame enters and exits the second filter box along the cleaning opening, and the second filter screen is detachably arranged in the mounting frame; when the mounting frame is located in the second filter box, one end of the mounting frame seals the cleaning opening, and the mounting frame is connected with the second filter box through a fixing assembly. On the basis, the effect of conveniently and efficiently cleaning filtered objects in time can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a sewage circulation treatment device and a treatment process. Background Art

[0002] At present, in social life and industrial development, some domestic sewage or industrial sewage is inevitably generated. If the sewage is discharged directly without treatment, it is easy to cause pollution to other water bodies. Therefore, most sewage needs to undergo certain treatment before being discharged.

[0003] Existing Chinese patent with publication number CN109502791A discloses a multi-stage circulating sewage treatment device and sewage treatment method, the sewage treatment device includes a first filter and a second filter, the first filter is provided with a first filter screen in the vertical direction, the first filter and the second filter are connected through a first pipe, the first pipe is provided with a first pump, the second filter is provided with a second filter screen and a third filter screen from top to bottom in the horizontal direction, the side wall below the second filter screen and the side wall below the third filter screen are connected through a second pipe, and the second pipe is provided with a second pump. The first filter screen is arranged vertically, while the second filter screen and the third filter screen are arranged horizontally, and stirring is arranged in the third filter chamber and the fourth filter chamber, and the stirring device includes a motor, a stirring rod and a stirring blade.

[0004] With respect to the above-mentioned related technologies, filter material will accumulate above the horizontal second filter screen and the third filter screen, which may easily cause the mesh holes to be clogged, and therefore needs to be cleaned; since the third filter chamber and the fourth filter chamber are relatively closed chambers, and the stirring device is located directly above the second filter screen and the third filter screen, it is not convenient to clean the filter material in a timely and efficient manner. Summary of the invention

[0005] In order to facilitate timely and efficient cleaning of filtered materials, the present application provides a sewage recycling treatment device and treatment process.

[0006] In the first aspect, the present application provides a sewage circulation treatment device adopting the following technical solution: A sewage circulation treatment device comprises a first filter box, a second filter box, a first filter screen and a second filter screen, wherein the outlet end of the first filter box is connected to the upper end of the second filter box, the first filter screen is vertically arranged on the first filter box, and the second filter screen is horizontally arranged on the second filter box, and an installation frame is connected to the second filter box in a sliding manner along the horizontal direction, a cleaning port is provided on one side of the second filter box, the installation frame enters and exits the second filter box along the cleaning port, and the second filter screen is detachably arranged in the installation frame; when the installation frame is located in the second filter box, one end of the installation frame seals the cleaning port, and the installation frame and the second filter box are connected by a fixing component.

[0007] By adopting the above technical solution, during operation, sewage is connected from the first filter box, and is initially filtered through the vertically arranged first filter screen, and then the sewage enters the second filter box from the outlet of the first filter box, and is secondary filtered through the horizontally arranged second filter screen; when it is necessary to clean the filtered material blocked on the second filter screen, the installation frame is directly slid and pulled out of the second filter box. At this time, the second filter screen is located outside the second filter box, instead of being cleaned in the second filter box with limited space, and will not be affected by the box body of the second filter box, so the filtered material on the second filter screen can be quickly cleaned. After cleaning, the installation frame is slid back into the second filter box, and then the installation frame is fixed by the fixing component, so as to achieve the effect of facilitating timely and efficient cleaning of the filter residue.

[0008] Preferably, a sealing plate is provided at one end of the mounting frame, one side of the sealing plate is attached to the outer side of the second filter box, and an annular sealing ring is provided on one side of the sealing plate attached to the second filter box, and the annular sealing ring is squeezed on the peripheral side of the cleaning port.

[0009] By adopting the above technical solution, when the installation frame slides into the second filter box, the annular sealing ring on the sealing plate is pressed against the outside of the second filter box to seal the cleaning port and prevent water in the second filter box from leaking out of the cleaning port.

[0010] Preferably, the cleaning port is arranged along the horizontal length direction of the second filter box, and both ends of the cleaning port are spaced from the edge of the second filter box.

[0011] By adopting the above technical solution, when the sealing plate is attached to the outer side of the second filter box, it is ensured that the annular sealing ring can surround and press against the peripheral side position of the cleaning port.

[0012] Preferably, the other side of the second filter box horizontally opposite to the cleaning port is connected to an external cavity, a replacement frame is slidably provided in the outer cavity, a third filter screen is provided on the replacement frame, and the side of the replacement frame close to the second filter screen is detachably connected to the installation frame; when the installation frame slides to the outside of the second filter box, the replacement frame enters the second filter box along the external cavity.

[0013] By adopting the above technical solution, when the second filter screen slides out of the second filter box along with the installation frame, it can drive the replacement frame and the third filter screen to move horizontally from the external cavity to the second filter box. At this time, the third filter screen can replace the second filter screen to work, ensuring the continuous filtering work in the second filter box.

[0014] Preferably, a cover is movably provided on the upper surface of the outer cavity.

[0015] By adopting the above technical solution, since some debris will also accumulate on the surface of the third filter screen, after opening the cover body, the debris on the third filter screen can be easily cleaned.

[0016] Preferably, a connecting port horizontally opposite to the cleaning port is provided on the side wall of the second filter box, the outer cavity is connected with the second filter box through the connecting port, and shielding parts are provided at both ends of the replacement frame; when the replacement frame is moved into the second filter box, the shielding parts cover the cleaning port and the connecting port.

[0017] By adopting the above technical solution, when the second filter screen slides out of the second filter box and the mounting frame slides into the second filter box, the shielding portion can block the cleaning port and the connecting port. Therefore, during the cleaning process of the second filter screen, the water body can be reduced from splashing out of the second filter box from the cleaning port, and the water body can also be reduced from entering the outer cavity from the connecting port.

[0018] Preferably, it also includes a positioning pin, a pin hole is provided at one end of the installation frame and the replacement frame that are close to each other, a clamping part is provided at both ends of the positioning pin, the clamping part is inserted into the pin hole, and an adjustment hole is vertically opened on the shielding part for the positioning pin to pass horizontally.

[0019] By adopting the above technical solution, the positioning pin is moved downward so that the clamping parts at both ends of the positioning pin are inserted into the pin holes, thereby limiting the relative movement of the installation frame and the replacement frame in the horizontal direction; by adjusting the hole, it is ensured that the positioning pin can pass through the shielding part horizontally, and at the same time, it is ensured that the positioning pin has space to move up and down, thereby realizing the installation and disassembly of the positioning pin.

[0020] Preferably, a first elastic portion is provided on the upper side of the positioning pin near the middle position, the first elastic portion is located in the adjustment hole and the upper end is inserted into the hole wall of the adjustment hole; when the clamping portion is inserted into the pin hole, the first elastic portion is in a natural state or a compressed state.

[0021] By adopting the above technical solution, when the locating pin passes through the adjustment hole and the clamping part is inserted into the pin hole, the first elastic part provides a force to limit the upward movement of the locating pin, thereby reducing the possibility of the clamping part detaching from the pin hole and ensuring the connection stability between the installation frame and the replacement frame.

[0022] Preferably, a brush body is provided at a position of the outer cavity close to the communicating port, the brush body is provided along the length direction of the communicating port, the brush body is located between the two shielding parts, and the lower end of the brush body elastically abuts against the upper surface of the third filter net.

[0023] By adopting the above technical solution, when the third filter screen slides into the second filter box for filtering, some filtered matter will remain on the upper surface of the third filter screen. When the replacement frame drives the third filter screen into the second filter box, the brush body can clean the upper surface of the third filter screen, so that most of the filtered matter is scraped to one side of the third filter screen; when the replacement frame drives the third filter screen into the outer cavity, the brush body can scrape the newly generated filtered matter to the other side, so as to clean the filtered matter on the third filter screen.

[0024] In the second aspect, the present application provides a sewage treatment process, which adopts the following technical solution: A sewage treatment process comprises any of the above-mentioned sewage circulation treatment devices, wherein the sewage is connected from the first filter box and is initially filtered through the vertically arranged first filter screen; the sewage enters the second filter box from the first filter box and is secondary filtered through the horizontally arranged second filter screen; when it is necessary to clean the filter material blocked on the second filter screen, the installation frame is slid out of the second filter box, and the third filter screen enters the second filter box from the outer cavity; then, the filter material on the second filter screen is cleaned, and the third filter screen can perform temporary filtering to ensure the normal operation of sewage filtration; after cleaning, the installation frame is slid back into the second filter box.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: (1) By arranging the coordination among the first filter box, the second filter box, the first filter screen, the second filter screen, the cleaning port, the mounting frame and the fixing assembly, the cleaning port can be directly opened, and the second filter screen can be slid out of the second filter box for cleaning, so as to achieve the effect of facilitating timely and efficient cleaning of the filter residue; (2) By setting the coordination between the replacement frame, the outer cavity and the third filter screen, when the second filter screen is slid out of the second filter box to clean the filtered matter, the third filter screen can simultaneously enter the second filter box to perform filtering work without pausing, thereby ensuring the normal operation of sewage filtration; (3) By providing the shielding portion, when cleaning the filtered material on the second filter screen, the shielding portion can block the cleaning port and the connecting port, thereby reducing the splashing of water from the cleaning port and also reducing the water from entering the outer cavity; (4) By providing a brush body, the filtered matter on the third filter screen can be scraped to both sides, making it easy to clean the debris on the third filter screen after opening the cover body. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the structure of the processing device of this embodiment; Figure 2 It is a partial structural schematic diagram of the second filter screen of the present embodiment when it slides out of the second filter box; Figure 3 is a schematic diagram of the internal structure of the processing device of this embodiment; Figure 4 It is a schematic diagram of the internal local structure of this embodiment; Figure 5 is a schematic diagram of the connection structure of the installation frame and the replacement frame of this embodiment; Figure 6 It is a structural schematic diagram highlighting the brush body of this embodiment.

[0027] Figure numerals: 1. first filter box; 2. second filter box; 3. first filter screen; 4. second filter screen; 5. mounting frame; 6. cleaning port; 7. fixing assembly; 8. sealing plate; 9. annular sealing ring; 10. outer cavity; 11. connecting port; 12. replacement frame; 13. third filter screen; 14. cover body; 15. shielding part; 16. positioning pin; 17. snap-fitting part; 18. adjusting hole; 19. first elastic part; 20. brush body; 201. bristles; 202. connecting plate; 21. second elastic part; 22. toggle rod; 23. annular convex plate; 24. pump body; 25. connecting pipe. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-6 This application is described in further detail.

[0029] The present application discloses a sewage circulation treatment device. Figure 1 and Figure 2The sewage circulation treatment device comprises a first filter box 1, a second filter box 2, a first filter screen 3 and a second filter screen 4. The first filter box 1 and the second filter box 2 are both square boxes. The first filter box 1 has an outlet and an inlet at both ends, and the outlet is connected to the upper end of the second filter box 2. The first filter screen 3 is vertically installed near the middle of the first filter box 1, and the second filter screen 4 is horizontally installed in the second filter box 2. The aperture of the first filter screen 3 is larger than that of the second filter screen 4.

[0030] Reference Figure 2 and Figure 3 A mounting frame 5 is connected to the second filter box 2 in a sliding manner in the horizontal direction. The mounting frame 5 is square in shape and is located in the horizontal cross section of the second filter box 2. A cleaning port 6 is provided on one side of the second filter box 2. The mounting frame 5 enters and exits the second filter box 2 along the cleaning port 6. The second filter screen 4 can be detachably fixed in the mounting frame 5. The mounting frame 5 can facilitate the sliding connection between the second filter screen 4 and the second filter box 2.

[0031] When the installation frame 5 is located in the second filter box 2, one end of the installation frame 5 seals the cleaning port 6, and the installation frame 5 is connected to the second filter box 2 via the fixing assembly 7. When it is necessary to clean the filtered matter on the second filter screen 4, the fixing assembly 7 on the installation frame 5 can be cancelled, and the installation frame 5 can be slid out of the second filter box 2. At this time, the second filter screen 4 also slides out of the second filter box 2 along with the installation frame 5. At this time, the area around the second filter screen 4 will not be affected by other components, and the filtered matter on the second filter screen 4 can be cleaned promptly and efficiently.

[0032] Specifically, a sealing plate 8 is fixed at one end of the mounting frame 5, and the sealing plate 8 is in a strip shape. One end face of the mounting frame 5 is fixed to the midline of the length direction of the sealing plate 8. One side of the sealing plate 8 is attached to the outside of the second filter box 2, and an annular sealing ring 9 is embedded in the side of the sealing plate 8 attached to the second filter box 2, and the annular sealing ring 9 is pressed against the peripheral side of the cleaning port 6. The fixing component 7 is selected to be a plurality of screws, which pass through the sealing plate 8 and are locked to the outer wall of the second filter box 2, so that the sealing plate 8 is fixed to the outside of the second filter screen 4 and squeezes the annular sealing ring 9, so that the sealing plate 8 seals the cleaning port 6.

[0033] The cleaning port 6 is arranged along the horizontal length direction of the side wall of the second filter box 2 , and the two ends of the cleaning port 6 are spaced from the edge of the second filter box 2 to ensure that the entire annular sealing ring 9 can be completely squeezed around the cleaning port 6 .

[0034] In some embodiments, the other side wall of the second filter box 2 horizontally opposite to the cleaning port 6 is connected with an outer cavity 10, the outer cavity 10 is a flat square shell, and one side of the outer cavity 10 is open; the side wall of the second filter box 2 is provided with a communication port 11 horizontally opposite to the cleaning port 6, and the open end of the outer cavity 10 is connected with the second filter box 2 through the communication port 11. An annular convex plate 23 is fixed to the open side of the outer cavity 10, and the annular convex plate 23 is attached to the position of the second filter box 2 located on the side of the communication port 11. The annular convex plate 23 is also fixed to the second filter box 2 by screws, thereby realizing a detachable connection between the outer cavity 10 and the second filter box 2.

[0035] A replacement frame 12 is slidably connected in the outer cavity 10, and the sliding direction of the replacement frame 12 is consistent with the sliding direction of the installation frame 5. The shape of the replacement frame 12 is the same as the structure of the installation frame 5. A third filter screen 13 is fixed on the replacement frame 12, and the aperture of the third filter screen 13 is the same as the aperture of the second filter screen 4. The side of the replacement frame 12 close to the second filter screen 4 is detachably connected to the installation frame 5. When the installation frame 5 slides to the outside of the second filter box 2, it drives the replacement frame 12 from the outer cavity 10 into the second filter box 2. Therefore, when cleaning the filtered material on the second filter screen 4, it can be filtered through the third filter screen 13, ensuring the normal operation of sewage filtration without stopping, thereby improving the filtration efficiency.

[0036] A cover 14 is movably connected to the upper surface of the outer cavity 10 . In this embodiment, the cover 14 is locked to the outer cavity 10 . When the cover 14 is opened, the filtered matter on the third filter screen 13 can be easily cleaned.

[0037] In some embodiments, reference Figure 3 and Figure 4 , shielding parts 15 are fixed at both ends of the replacement frame 12, the shielding parts 15 are strip-shaped plates and extend upward, and the height of the shielding parts 15 is slightly less than the height of the connecting port 11. The shielding parts 15 are located at both ends of the sliding direction of the replacement frame 12. When the replacement frame 12 is completely moved into the second filter box 2, the two shielding parts 15 cover the cleaning port 6 and the connecting port 11 respectively. Therefore, when the second filter screen 4 is cleaned outside the second filter box 2, it can reduce the splashing of water from the cleaning port 6, and at the same time reduce the water from the connecting port 11 Entering the outer cavity 10.

[0038] Reference Figure 4 and Figure 5A positioning pin 16 is provided between the installation frame 5 and the replacement frame 12, and the installation frame 5 and the replacement frame 12 are detachably connected through the positioning pin 16. A pin hole is vertically provided at one end of the installation frame 5 and the replacement frame 12 that are close to each other. The positioning pin 16 is in the shape of a rod and passes horizontally through the shielding portion 15. An adjustment hole 18 is vertically provided on the shielding portion 15 for the positioning pin 16 to pass horizontally. A clamping portion 17 is fixed at both ends of the positioning pin 16. When the clamping portion 17 is inserted into the pin holes of the replacement frame 12 and the installation frame 5, the installation frame 5 and the replacement frame 12 can be connected together in the horizontal direction, limiting the relative movement between the installation frame 5 and the replacement frame 12 in the horizontal direction. The adjustment hole 18 can provide space for the positioning pin 16 to move up and down for assembly and disassembly.

[0039] In some embodiments, a first elastic portion 19 is vertically fixed to the upper side of the positioning pin 16 near the middle position. The first elastic portion 19 is selected as a spring or a rubber column. In this embodiment, a spring is selected. The first elastic portion 19 is located in the adjustment hole 18 and the upper end is plugged into the upper hole wall of the adjustment hole 18 to limit the first elastic portion 19. When the clamping portion 17 is plugged into the pin hole, the first elastic portion 19 is in a natural state or a compressed state. Therefore, the first elastic portion 19 can apply a downward force to the positioning pin 16, reduce the upward movement of the clamping portion 17 from the pin hole, and ensure the installation stability of the positioning pin 16.

[0040] In some implementations, reference Figure 4 and Figure 6 A brush body 20 is fixed to the inner wall of the outer cavity 10 near the connecting port 11. The brush body 20 is arranged along the length direction of the connecting port 11. The brush body 20 is located between the two shielding parts 15. The lower end of the brush body 20 elastically abuts against the upper surface of the third filter screen 13. Therefore, when the third filter screen 13 is in the process of horizontal sliding, the filtered matter on the third filter screen 13 will be scraped to the position close to the two ends of the third filter screen 13 and close to the shielding part 15, which is convenient for cleaning the filtered matter.

[0041] The brush body 20 includes bristles 201 and a connecting plate 202. The bristles 201 are fixed to the lower surface of the rod and the connecting plate 202, and the upper end of the connecting plate 202 is connected to the upper inner wall of the outer cavity 10 through a second elastic part 21. The second elastic part 21 is selected as a spring or a rubber column to ensure that the lower end of the bristles 201 can maintain elastic contact with the third filter screen 13.

[0042] A toggle rod 22 is fixed on one side opposite to the shielding portion 15. The toggle rod 22 is horizontally threadedly connected to the shielding portion 15 for easy position adjustment. The position of the toggle rod 22 is close to the height position of the connecting plate 202. When the third filter 13 is completely in the outer cavity 10 or the second filter box 2, one end of the toggle rod 22 abuts against the connecting plate 202 and causes the brush body 20 to tilt in the vertical direction. When the third filter 13 starts to move a certain distance, the toggle rod 22 breaks contact with the connecting plate 202. At this time, the brush body 20 returns to the vertical state and the lower end maintains elastic abutment with the upper surface of the third filter 13.

[0043] When the replacement frame 12 is about to be completely moved from the outer cavity 10 to the second filter box 2, the end of the toggle rod 22 begins to abut against the connecting plate 202, and drives the brush body 20 to rotate to a certain extent, so that the lower end of the brush body 20 leaves the surface of the third filter screen 13. When the third filter screen 13 returns to the initial stage in the outer cavity 10, the brush body 20 returns to the vertical state and abuts against the upper surface of the third filter screen 13, thereby reducing some of the filtered materials being scraped back and forth during the back and forth scraping process of the brush body 20.

[0044] Similarly, when the third filter 13 is about to completely enter the outer cavity 10, the toggle rod 22 on the other shielding portion 15 also begins to contact the connecting plate 202 and rotates with the brush body 20, so that the lower end of the brush body 20 is separated from the filtered material that has been scraped to one side and will not be affected by the next scraping action.

[0045] In some embodiments, reference Figure 1 and Figure 2 A connecting pipe 25 is installed at the bottom of the second box body, and the other end of the connecting pipe 25 is connected to the top of the inlet end of the first filter box 1. A pump body 24 is installed on the connecting pipe 25, so that the filtered water can be pumped back to the first filter box 1 for circulation filtration.

[0046] The implementation principle of a sewage circulation treatment device in an embodiment of the present application is: when it is necessary to clean the filtered material on the second filter screen 4, the fixing of the sealing plate 8 by the fixing component 7 can be cancelled, and the mounting frame 5 can be slid horizontally out of the second filter box 2. At this time, the second filter screen 4 also slides out of the second filter box 2 along with the mounting frame 5, so as to achieve the effect of facilitating timely and efficient cleaning of the filter residue.

[0047] When the second filter screen 4 slides out of the second filter box 2, the third filter screen 13 also slides from the outer cavity 10 into the second filter box 2 simultaneously. Therefore, during the process of cleaning the second filter screen 4, the third filter screen 13 can perform filtering work without stopping the machine, thereby ensuring filtering efficiency.

[0048] The embodiment of the present application also discloses a sewage treatment process, including the above-mentioned sewage circulation treatment device, the sewage is connected from the first filter box 1, and is initially filtered through the vertically arranged first filter screen 3; then the sewage enters the second filter box 2 from the first filter box 1, and is secondary filtered through the horizontally arranged second filter screen 4.

[0049] When it is necessary to clean the filtered matter blocked on the second filter screen 4, the installation frame 5 is horizontally slid out of the second filter box 2, and the third filter screen 13 also enters the second filter box 2 from the outer cavity 10; then the filtered matter on the second filter screen 4 is cleaned, and the third filter screen 13 can perform temporary filtering to ensure the normal operation of sewage filtration; after cleaning, the installation frame 5 is slid back into the second filter box 2.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sewage circulation treatment device, comprising a first filter box (1), a second filter box (2), a first filter screen (3) and a second filter screen (4), characterized in that: The outlet end of the first filter box (1) is connected to the upper end of the second filter box (2); the first filter screen (3) is vertically arranged on the first filter box (1); the second filter screen (4) is horizontally arranged on the second filter box (2); a mounting frame (5) is slidably connected to the second filter box (2) in a horizontal direction; a cleaning port (6) is provided on one side of the second filter box (2); the mounting frame (5) enters and exits the second filter box (2) along the cleaning port (6); and the second filter screen (4) is detachably arranged in the mounting frame (5); When the installation frame (5) is located in the second filter box (2), one end of the installation frame (5) seals the cleaning port (6), and the installation frame (5) is connected to the second filter box (2) via a fixing assembly (7).

2. A sewage circulation treatment device according to claim 1, characterized in that: A sealing plate (8) is provided at one end of the mounting frame (5), one side of the sealing plate (8) being in contact with the outside of the second filter box (2), and an annular sealing ring (9) is provided on one side of the sealing plate (8) being in contact with the second filter box (2), the annular sealing ring (9) being pressed against the peripheral side of the cleaning port (6).

3. A sewage circulation treatment device according to claim 2, characterized in that: The cleaning port (6) is arranged along the horizontal length direction of the second filter box (2), and both ends of the cleaning port (6) are spaced from the edge of the second filter box (2).

4. A sewage circulation treatment device according to claim 1, characterized in that: The other side of the second filter box (2) horizontally opposite to the cleaning port (6) is connected to an external cavity (10), a replacement frame (12) is slidably arranged in the external cavity (10), a third filter screen (13) is arranged on the replacement frame (12), and a side of the replacement frame (12) close to the second filter screen (4) is detachably connected to the installation frame (5); when the installation frame (5) slides to the outside of the second filter box (2), the replacement frame (12) enters the second filter box (2) along the external cavity (10).

5. A sewage circulation treatment device according to claim 4, characterized in that: A cover body (14) is movably provided on the upper surface of the outer cavity (10).

6. A sewage circulation treatment device according to claim 4, characterized in that: The side wall of the second filter box (2) is provided with a communication port (11) horizontally opposite to the cleaning port (6); the outer cavity (10) is connected to the second filter box (2) through the communication port (11); and shielding portions (15) are provided at both ends of the replacement frame (12); when the replacement frame (12) is moved into the second filter box (2), the shielding portions (15) shield the cleaning port (6) and the communication port (11).

7. A sewage circulation treatment device according to claim 6, characterized in that: It also comprises a positioning pin (16), a pin hole is provided at one end of the installation frame (5) and the replacement frame (12) close to each other, a clamping portion (17) is provided at both ends of the positioning pin (16), the clamping portion (17) is inserted into the pin hole, and an adjustment hole (18) is vertically opened on the shielding portion (15) for the positioning pin (16) to pass horizontally.

8. A sewage circulation treatment device according to claim 7, characterized in that: A first elastic portion (19) is provided on the upper side of the positioning pin (16) near the middle position. The first elastic portion (19) is located in the adjustment hole (18) and the upper end is inserted into the hole wall of the adjustment hole (18). When the clamping portion (17) is inserted into the pin hole, the first elastic portion (19) is in a natural state or a compressed state.

9. A sewage circulation treatment device according to claim 6, characterized in that: A brush body (20) is arranged at a position of the outer cavity (10) close to the connecting opening (11); the brush body (20) is arranged along the length direction of the connecting opening (11); the brush body (20) is located between the two shielding portions (15); and the lower end of the brush body (20) elastically abuts against the upper surface of the third filter screen (13).

10. A sewage treatment process, comprising the sewage circulation treatment device according to any one of claims 1 to 9, characterized in that: Sewage is introduced from the first filter box (1) and is initially filtered through the first filter screen (3) arranged vertically; Sewage enters the second filter box (2) from the first filter box (1) and is filtered twice through the second filter screen (4) arranged horizontally; When it is necessary to clean the filtered matter that is blocked on the second filter screen (4), the installation frame (5) is slidably pulled out of the second filter box (2), and at this time the third filter screen (13) enters the second filter box (2) from the outer cavity (10); Next, the filtered material on the second filter screen (4) is cleaned, and the third filter screen (13) can perform temporary filtering to ensure the normal operation of sewage filtration; After cleaning, the installation frame (5) is slid back into the second filter box (2).

Images