Automatic cleaning device for weir scaling of secondary sedimentation tank effluent

Abstract

This utility model belongs to the field of wastewater treatment technology and discloses an automatic cleaning device for scaling on the effluent weir of a secondary sedimentation tank. It includes a fixed base, a lifting assembly, and a roller brush. The fixed base is installed on the scraper bridge at one end facing the effluent weir. The lifting assembly is slidably installed on the fixed base, sliding along the width of the effluent weir. The roller brush is rotatably installed on the lifting assembly, abutting against the bottom and side walls of the effluent weir. The roller brush can rotate around a vertical axis to simultaneously clean the bottom and side walls of the effluent weir. This utility model allows the roller brush to be lifted to the effluent weir for disassembly and replacement, or lowered to contact the bottom wall of the effluent weir, improving the cleaning effect. The roller brush's vertical movement and rotation around its vertical axis occur simultaneously, further enhancing the cleaning effect. Even if the roller brush experiences partial wear, the cleaning effect remains unaffected, and cleaning costs are saved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to an automatic cleaning device for scale buildup on the effluent weir of a secondary sedimentation tank. Background Technology

[0002] In wastewater treatment processes, the effluent weir of the secondary sedimentation tank is a core component for achieving sludge-water separation. The effluent weir ensures sedimentation effectiveness and effluent quality by uniformly collecting water, controlling water level, intercepting scum, and stabilizing water flow. However, a large amount of suspended solids, algae, colloids, and other substances in the wastewater easily adhere to the surface of the effluent weir, forming stubborn scale. This scale disrupts the flatness of the effluent weir, causing uneven water flow, significantly reducing sludge-water separation efficiency, and deteriorating effluent quality. Furthermore, the adhered scale can interfere with downstream water quality monitoring equipment, affecting the accuracy and reliability of the test data. Therefore, timely cleaning of the scale buildup on the effluent weir is necessary.

[0003] Currently, wastewater treatment plants often use homemade, simple tools such as shovels to address scaling issues at the effluent weirs of secondary sedimentation tanks. Workers climb around the weirs for close-range cleaning, a method that is not only labor-intensive and time-consuming, resulting in extremely low efficiency, but also poses a serious risk of drowning due to the slippery environment around the sedimentation tank and the frequent movement and forceful scraping. Furthermore, these homemade tools lack standardized design, making it difficult to precisely control the scraping force and angle, potentially damaging the weir structure. They also fail to completely remove stubborn scale, making it difficult to meet the cleaning requirements for the long-term stable operation of the effluent weir.

[0004] By installing an automatic cleaning device, the effluent weir can be automatically cleaned, solving the safety issues for operators. Some existing automatic cleaning devices work in conjunction with a scraper bridge above the secondary sedimentation tank. The automatic cleaning device is mounted on the scraper bridge, and its rotation drives the device to move across the effluent weir, achieving automatic cleaning and saving energy. However, the scraper bridge itself is quite heavy, making the installation and disassembly of the automatic cleaning device difficult. Furthermore, the roller brushes experience significant wear after prolonged use and require replacement. Delayed replacement affects cleaning effectiveness, and frequent brush replacements not only increase costs but also present challenges due to the brushes' location within the effluent weir, making replacement difficult and requiring careful assembly and disassembly. Utility Model Content

[0005] The purpose of this utility model is to provide an automatic cleaning device for scale buildup on the effluent weir of a secondary sedimentation tank, which solves the problems of high replacement cost of roller brushes and the impact of roller brush wear on cleaning quality in automatic cleaning devices for scale buildup on the effluent weir of a secondary sedimentation tank.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Automatic cleaning device for scale buildup on the effluent weir of the secondary sedimentation tank, including:

[0008] A fixing seat is installed on the scraper bridge at one end facing the outlet weir;

[0009] A lifting assembly is slidably mounted on the fixed base, and the sliding direction is along the width direction of the outlet weir;

[0010] A roller brush is rotatably mounted on the lifting assembly. The roller brush abuts against the bottom and side walls of the outlet weir. The roller brush can rotate around a vertical axis to clean the bottom and side walls of the outlet weir simultaneously.

[0011] In some embodiments, the fixed base is provided with a slide bar, and the lifting assembly includes a slider that is slidably disposed on the slide bar.

[0012] In some embodiments, the fixed base is provided with a sliding drive member, the output end of which is connected to the slider to drive the slider to slide on the slide rod.

[0013] In some embodiments, the lifting assembly further includes a lifting plate and a base plate spaced apart in a vertical direction, the base plate and the slider being connected by a guide rod, and the lifting plate being slidably mounted on the guide rod.

[0014] In some embodiments, the lifting assembly further includes a lifting drive component, which is fixed to the base plate, and the output end of the lifting drive component is connected to the lifting plate to drive the lifting plate to slide and rise along the guide rod.

[0015] In some embodiments, the output end of the lifting drive is provided with a screw and is capable of driving the screw to rotate. The lifting plate is provided with a nut, and the screw is threadedly connected to the nut to convert the rotation of the screw into the movement of the nut, thereby driving the lifting plate to move up and down.

[0016] In some embodiments, a linear bearing is provided between the lifting plate and the guide rod.

[0017] In some embodiments, the automatic cleaning device for scaling of the secondary sedimentation tank effluent weir further includes a rotation drive component, which is mounted on the lifting plate. The roller brush is fixedly mounted on the output end of the rotation drive component, and the rotation drive component is configured to drive the roller brush to rotate.

[0018] In some embodiments, the automatic cleaning device for scaling on the secondary sedimentation tank effluent weir further includes a spray pipe, one end of which is fixed on the fixed base and connected to a water source, and the other end of which is provided with a nozzle, which is positioned directly opposite the effluent weir.

[0019] In some embodiments, the nozzle is positioned in front of the roller brush along the rotation direction of the scraper bridge.

[0020] The beneficial effects of this utility model are:

[0021] The automatic cleaning device for scaling on the effluent weir of a secondary sedimentation tank provided by this utility model features a roller brush rotatably mounted on a lifting assembly. This facilitates the lifting and lowering of the roller brush, allowing it to be raised to the effluent weir for disassembly and replacement, or lowered to contact the bottom wall of the weir, thus improving the cleaning effect. Furthermore, by controlling the simultaneous vertical movement and rotation of the roller brush around its vertical axis, the cleaning effect is further enhanced. By sliding the lifting assembly on the fixed base, when the roller brush wears down after prolonged use, the contact between the roller brush and the side wall of the effluent weir becomes less tight, affecting the cleaning effect. By controlling the sliding of the lifting assembly along the width of the effluent weir, the roller brush can be ensured to maintain close contact with at least one side wall of the effluent weir, extending its service life. Even with partial wear, the cleaning effect remains unaffected, thereby saving cleaning costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the automatic cleaning device for scaling on the effluent weir of the secondary sedimentation tank provided in this embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the installation of the automatic cleaning device for scaling on the effluent weir of the secondary sedimentation tank provided in this embodiment of the utility model.

[0024] Figure 3 yes Figure 2 AA section view;

[0025] Figure 4 yes Figure 3 A magnified structural diagram of region B in the middle.

[0026] In the picture:

[0027] 100. Secondary sedimentation tank; 101. Support pier; 200. Effluent weir; 300. Sludge scraper bridge; 301. Drive trolley;

[0028] 400. Automatic cleaning device for scaling on the effluent weir of the secondary sedimentation tank; 401. Fixed base; 4011. Slide rod; 4012. Sliding drive component; 402. Lifting assembly; 4021. Slider; 4022. Lifting plate; 4023. Base plate; 4024. Guide rod; 4025. Lifting drive component; 4026. Screw; 4027. Nut; 403. Roller brush; 404. Rotation drive component; 405. Spray pipe; 4051. Nozzle. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0030] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0033] This utility model embodiment provides an automatic cleaning device 400 for cleaning the scale buildup on the effluent weir of a secondary sedimentation tank 100. For example... Figures 2-4As shown, a effluent weir 200 is provided around the secondary sedimentation tank 100, and a support pier 101 is provided at the center of the secondary sedimentation tank 100. A sludge scraper bridge 300 is rotatably installed on the support pier 101. The other end of the sludge scraper bridge 300 extends to the outside of the effluent weir 200. A drive trolley 301 is provided at the other end of the sludge scraper bridge 300. When the drive trolley 301 moves along the outside of the effluent weir 200, it can drive the sludge scraper bridge 300 to rotate. During the rotation of the sludge scraper bridge 300, the bottom of the secondary sedimentation tank 100 is scraped. This utility model embodiment provides an automatic cleaning device 400 for scaling on the effluent weir of a secondary sedimentation tank. The device is installed on a sludge scraper bridge 300 and faces the effluent weir 200. When the sludge scraper bridge 300 rotates to scrape sludge, the automatic cleaning device 400 moves with the sludge scraper bridge 300, continuously removing scale formed on the surface of the effluent weir 200 due to suspended solids, sphagnum moss, colloids, etc., ensuring the flatness of the effluent weir 200 and the uniformity of water flow, improving the efficiency of mud-water separation and the quality of the effluent, and achieving automatic cleaning.

[0034] like Figure 1 As shown, the automatic cleaning device 400 for scaling of the secondary sedimentation tank effluent weir provided in this embodiment of the present invention includes a fixed base 401, a lifting assembly 402, and a roller brush 403. The fixed base 401 is installed on the sludge scraper bridge 300 at one end facing the effluent weir 200. The lifting assembly 402 is slidably installed on the fixed base 401, and the sliding direction of the lifting assembly 402 is along the width direction of the effluent weir 200. The roller brush 403 is rotatably installed on the lifting assembly 402, and the roller brush 403 abuts against the bottom wall and side wall of the effluent weir 200. The roller brush 403 can rotate around a vertical axis to clean the bottom wall and side wall of the effluent weir 200 simultaneously.

[0035] Combination Figure 4The automatic cleaning device 400 for scaling on the effluent weir of a secondary sedimentation tank provided by this utility model features a roller brush 403 rotatably mounted on a lifting assembly 402, which is slidably installed on a fixed base 401. This allows the roller brush 403 to simultaneously perform lifting and rotating movements for cleaning. The roller brush 403 can be lifted above the effluent weir 200 for removal and replacement, or lowered to contact the bottom wall of the effluent weir 200 for cleaning. Furthermore, by controlling the roller brush 403 to move vertically and rotate around a vertical axis simultaneously, the roller brush 403 and the effluent weir 200... The bottom and side walls of the roller brush 403 abut against each other, further enhancing the cleaning effect and achieving comprehensive cleaning of the outlet weir 200. By sliding the lifting assembly 402 onto the fixed base 401, when the roller brush 403 wears down after prolonged use, the contact between the roller brush 403 and the side wall of the outlet weir 200 becomes less tight, affecting the cleaning effect. By controlling the sliding of the lifting assembly 402 along the width direction of the outlet weir 200, the roller brush 403 can be controlled to maintain close contact with at least one side wall of the outlet weir 200, extending the service life of the roller brush 403. Even with partial wear, the cleaning effect remains unaffected, thus saving cleaning costs. Figure 4 When the roller brush 403 wears down, it can be lowered by the lifting assembly 402, ensuring that the roller brush 403 remains in close contact with the bottom wall of the outlet weir 200. The lifting assembly 402 can also slide on the fixed base 401 (the sliding direction is...). Figure 4 The left and right directions in the middle are also the radial directions of the secondary sedimentation tank 100. In this embodiment, the secondary sedimentation tank 100 is circular and the outlet weir 200 is annular. When the lifting component 402 drives the roller brush 403 to move, the roller brush 403 is in close contact with at least one side wall of the outlet weir 200 to ensure the cleaning effect.

[0036] In some embodiments, a slide bar 4011 is provided on the fixed base 401, and the lifting assembly 402 includes a slider 4021, which is slidably disposed on the slide bar 4011.

[0037] like Figure 1As shown, the fixed base 401 includes a top plate and two side plates. The two side plates are spaced apart on the top plate and fixedly connected. The top plate is fixedly connected to the scraper bridge 300. A sliding rod 4011 is connected between the two side plates, and the sliding rod 4011 is arranged along the length direction of the scraper bridge 300. Preferably, two sliding rods 4011 are provided, and a slider 4021 is slidably disposed on the two sliding rods 4011 to ensure that the slider 4021 can slide in the horizontal direction, thereby driving the lifting assembly 402 and the roller brush 403 to move in the width direction of the outlet weir 200, adjusting the distance between the roller brush 403 and the side wall of the outlet weir 200. Initially, when the roller brush 403 extends into the outlet weir 200, the outer diameter of the roller brush 403 is equal to the width of the outlet weir 200, and the bottom of the roller brush 403 abuts against the bottom of the outlet weir 200. When the roller brush 403 rotates, it can clean the bottom wall and side wall of the outlet weir 200 simultaneously. After prolonged use, the roller brush 403 experiences some wear, affecting its cleaning effect. By adjusting the lowering position of the roller brush 403 and its distance from the side wall of the outlet weir 200 using the lifting component 402, the bottom wall and one side wall of the outlet weir 200 can be cleaned simultaneously while the roller brush 403 rotates. After the scraper bridge 300 completes one revolution, the other side wall is cleaned, thus reducing the need to replace the roller brush 403. This helps save on replacement costs and minimizes the impact of roller brush 403 replacement on cleaning efficiency. Preferably, in the initial position, the slider 4021 is located in the middle of the slide rod 4011, and the length of the slide rod 4011 is greater than the width of the outlet weir 200 to facilitate smooth sliding of the slider 4021.

[0038] In some embodiments, a sliding drive member 4012 is provided on the fixed base 401, and the output end of the sliding drive member 4012 is connected to the slider 4021 to drive the slider 4021 to slide on the slide bar 4011.

[0039] like Figure 1 The sliding drive component 4012 employs a linear drive mechanism such as a cylinder or hydraulic cylinder. The sliding drive component 4012 is fixed to a side plate, and its output end is connected to the slider 4021 to drive the sliding motion. Preferably, the output end of the sliding drive component 4012 is connected to the middle position of the slider 4021, and the two sliding rods 4011 are symmetrically arranged on both sides, ensuring smooth and accurate movement and improving cleaning effect and efficiency.

[0040] In some embodiments, the lifting assembly 402 further includes a lifting plate 4022 and a base plate 4023 arranged at intervals along the vertical direction. The base plate 4023 and the slider 4021 are connected by a guide rod 4024, and the lifting plate 4022 is slidably mounted on the guide rod 4024.

[0041] like Figure 1In the illustrated embodiment, four guide rods 4024 are spaced apart on the base plate 4023. The top ends of the guide rods 4024 are fixedly connected to the slider 4021 to form a whole. A lifting plate 4022 is slidably mounted on the four guide rods 4024. The lifting plate 4022 can slide between the base plate 4023 and the slider 4021, thereby driving the roller brush 403 to move up and down. Preferably, a linear bearing is provided between the lifting plate 4022 and the guide rods 4024. By supporting and guiding the lifting plate 4022, the lifting friction is reduced, the roller brush 403 is supported, and its stable and smooth vertical movement is ensured.

[0042] In some embodiments, the lifting assembly 402 further includes a lifting drive 4025, which is fixed on the base plate 4023. The output end of the lifting drive 4025 is connected to the lifting plate 4022 to drive the lifting plate 4022 to slide and lift along the guide rod 4024.

[0043] like Figure 1 The lifting drive component 4025 can be a cylinder or a motor, and can be a linear drive component or a rotary drive component 404. By setting the lifting drive component 4025, automatic lifting control of the lifting plate 4022 can be achieved, enabling remote operation. The lifting drive component 4025 is fixed on the base plate 4023. When the lifting drive component 4025 has a linear output, the output rods connect to the lifting plate 4022. When the lifting drive component 4025 has a rotary output, a transmission assembly can be set to achieve lifting control of the lifting plate 4022.

[0044] In some embodiments, the output end of the lifting drive 4025 is provided with a screw 4026 and can drive the screw 4026 to rotate. The lifting plate 4022 is provided with a nut 4027. The screw 4026 and the nut 4027 are threadedly connected to convert the rotation of the screw 4026 into the movement of the nut 4027, thereby driving the lifting plate 4022 to move up and down.

[0045] When the lifting drive component 4025 outputs rotation, such as a rotating motor, the motor is fixed to the base plate 4023. The output rod of the rotating motor is fixedly connected to the screw 4026 and can drive the screw 4026 to rotate. By setting a nut 4027 (rotatably mounted via a bearing) on ​​the lifting plate 4022, the rotational motion is converted into translational motion through the threaded transmission of the screw 4026 and the nut 4027, thus controlling the lifting of the lifting plate 4022. Since the top end of the screw 4026 is hinged to the slider 4021, the lifting stability of the lifting plate 4022 is good, and the movement accuracy is high.

[0046] In some embodiments, the automatic cleaning device 400 for scaling of the secondary sedimentation tank effluent weir further includes a rotation drive 404, which is mounted on a lifting plate 4022. A roller brush 403 is fixedly mounted on the output end of the rotation drive 404, and the rotation drive 404 is configured to drive the roller brush 403 to rotate.

[0047] For example Figure 1 Taking a rotating motor as an example, the rotating motor is fixed on the lifting plate 4022. The output rod of the rotating motor is vertically downward and connected to the brush shaft of the roller brush 403. When the rotating motor drives the roller brush 403 to rotate, the roller brush 403 cleans the side wall and bottom wall of the outlet weir 200 simultaneously, resulting in high cleaning efficiency. Automatic control of the roller brush 403 is achieved by setting a rotating drive component 404, and it can also be remotely controlled. The brush shaft and the output rod of the rotating motor can be fixed by a flange connection.

[0048] In some embodiments, the automatic cleaning device 400 for scaling on the secondary sedimentation tank effluent weir further includes a spray pipe 405. One end of the spray pipe 405 is fixed to a mounting base 401 and connected to a water source, while the other end of the spray pipe 405 is equipped with a nozzle, which is positioned directly opposite the effluent weir 200. By providing the spray pipe 405 and the nozzle, high-pressure water can be supplied during the cleaning process of the roller brush 403. By setting the length of the spray pipe 405 and the spray angle of the nozzle, the high-pressure water can be delivered to a designated location and sprayed out in the form of a high-pressure jet through the nozzle. When cleaning the effluent weir 200, the high-pressure water can wash away stubborn stains, algae, sludge, and other impurities adhering to the surface of the effluent weir 200, assisting the cleaning brush in performing a more thorough cleaning and improving the cleaning effect. At the same time, it can also rinse and cool the cleaning brush, extending the service life of the cleaning brush. Preferably, the end of the spray pipe 405 is equipped with multiple nozzles, and the spray direction of the multiple nozzles can be freely set, respectively tilting to spray the bottom wall or side wall of the effluent weir 200 to improve the cleaning effect.

[0049] In some embodiments, along the rotation direction of the scraper bridge 300, the nozzle is positioned in front of the roller brush 403. Thus, when the scraper bridge 300 rotates, the nozzle first sprays high-pressure water onto the bottom wall and / or side wall of the outlet weir 200, and then the roller brush 403 scrubs the bottom wall and side wall of the outlet weir 200. Of course, in some embodiments, at least one nozzle sprays water towards the roller brush 403, which can clean the roller brush 403. The nozzle and the spray pipe 405 are fixedly connected by a sealing flange, which serves to fix the nozzle position and seal to prevent high-pressure water leakage.

[0050] The automatic cleaning device 400 for scale buildup at the effluent weir of the secondary sedimentation tank provided by this utility model achieves automated cleaning of the roller brush 403 by controlling the lifting and moving motion of the roller brush 403. At the same time, it avoids interference of scale on downstream water quality testing equipment, ensuring accurate and reliable test data and realizing safe, efficient and stable operation of the sewage treatment process.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An automatic cleaning device for scaling on the effluent weir of a secondary sedimentation tank, characterized in that, include: A fixing seat (401) is installed on the sludge scraper bridge (300) at one end facing the outlet weir (200); A lifting assembly (402) is slidably mounted on the fixed base (401) and the sliding direction is along the width direction of the outlet weir (200); A roller brush (403) is rotatably mounted on the lifting assembly (402). The roller brush (403) abuts against the bottom wall and side wall of the outlet weir (200). The roller brush (403) can rotate around a vertical axis to clean the bottom wall and side wall of the outlet weir (200) simultaneously.

2. The automatic cleaning device for scaling on the effluent weir of the secondary sedimentation tank according to claim 1, characterized in that, The fixed base (401) is provided with a slide rod (4011), and the lifting assembly (402) includes a slider (4021), which is slidably disposed on the slide rod (4011).

3. The automatic cleaning device for scaling on the effluent weir of the secondary sedimentation tank according to claim 2, characterized in that, The fixed base (401) is provided with a sliding drive (4012), and the output end of the sliding drive (4012) is connected to the slider (4021) to drive the slider (4021) to slide on the slide rod (4011).

4. The automatic cleaning device for scaling on the effluent weir of the secondary sedimentation tank according to claim 2, characterized in that, The lifting assembly (402) further includes a lifting plate (4022) and a base plate (4023) arranged at intervals along the vertical direction. The base plate (4023) and the slider (4021) are connected by a guide rod (4024), and the lifting plate (4022) is slidably mounted on the guide rod (4024).

5. The automatic cleaning device for scaling on the effluent weir of the secondary sedimentation tank according to claim 4, characterized in that, The lifting assembly (402) further includes a lifting drive (4025), which is fixed on the base plate (4023). The output end of the lifting drive (4025) is connected to the lifting plate (4022) to drive the lifting plate (4022) to slide and lift along the guide rod (4024).

6. The automatic cleaning device for scaling on the effluent weir of the secondary sedimentation tank according to claim 5, characterized in that, The output end of the lifting drive (4025) is provided with a screw (4026) and can drive the screw (4026) to rotate. The lifting plate (4022) is provided with a nut (4027). The screw (4026) and the nut (4027) are threadedly connected to convert the rotation of the screw (4026) into the movement of the nut (4027), thereby driving the lifting plate (4022) to move up and down.

7. The automatic cleaning device for scaling on the effluent weir of the secondary sedimentation tank according to claim 4, characterized in that, A linear bearing is provided between the lifting plate (4022) and the guide rod (4024).

8. The automatic cleaning device for scaling on the effluent weir of the secondary sedimentation tank according to claim 4, characterized in that, It also includes a rotation drive (404) mounted on the lifting plate (4022), and the roller brush (403) is fixedly mounted on the output end of the rotation drive (404). The rotation drive (404) is configured to drive the roller brush (403) to rotate.

9. The automatic cleaning device for scaling on the effluent weir of the secondary sedimentation tank according to claim 1, characterized in that, It also includes a nozzle (405), one end of which is fixed on the fixed base (401) and connected to the water source, and the other end of which is provided with a nozzle, which is positioned directly opposite the water outlet weir (200).

10. The automatic cleaning device for scaling on the effluent weir of the secondary sedimentation tank according to claim 9, characterized in that, Along the rotation direction of the scraper bridge (300), the nozzle is located in front of the roller brush (403).

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