A sewage treatment secondary sedimentation tank scum cleaning device

Abstract

This application provides a scum removal device for a secondary sedimentation tank in wastewater treatment, including a tank body, a scum discharge port, a rotating mechanism, a scraper, and a guiding mechanism. The scum discharge port is installed on the tank wall. The rotating mechanism includes a driver and a rotating arm. The driver is installed inside the tank body, and the rotating arm is installed on the driver and rotates around the axis of the tank body under the drive of the driver. The scraper is installed on the rotating arm and rotates with the rotating arm. The guiding mechanism includes a mounting base, a receiving space, a discharge channel, at least one input guide, at least one output guide, at least one filter screen, and an opening and closing assembly. The scum removal device for a secondary sedimentation tank in wastewater treatment provided by this application can prevent scum leakage and has a good cleaning effect.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment equipment technology, and in particular to a scum removal device for a secondary sedimentation tank in wastewater treatment. Background Technology

[0002] Secondary settling tanks are an important component of activated sludge systems, used to clarify the mixed liquor and recover and concentrate activated sludge. A secondary settling tank typically consists of an inlet device, a sedimentation zone, an effluent device, and a sludge zone. Because the activated sludge in a secondary settling tank is lightweight, it usually floats on the surface. Furthermore, the activated sludge in the secondary settling tank is easily corroded, thus requiring timely cleaning. Currently, when cleaning surface scum, a rotating mechanism at the center of the secondary settling tank typically drives scrapers to rotate on the water surface. The scrapers move the scum to the discharge port, achieving the purpose of scum removal. However, when using scrapers to clean scum, scum easily leaks through gaps between the scraper and the tank wall, and between the scraper and the discharge port, resulting in reduced cleaning effectiveness. Summary of the Invention

[0003] The purpose of this application is to provide a scum removal device for secondary sedimentation tanks in sewage treatment, so as to solve the technical problem in the prior art that scum is prone to leakage, resulting in poor scraper cleaning effect.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide a scum removal device for a secondary sedimentation tank in wastewater treatment, comprising:

[0005] Pool body;

[0006] The slag discharge port is installed on the wall of the pool body;

[0007] A rotating mechanism, comprising a driver and a rotating arm, wherein the driver is mounted inside the pool body and the rotating arm is mounted on the driver and rotates around the axis of the pool body under the drive of the driver;

[0008] A scraper is mounted on the rotating arm and rotates with the rotating arm;

[0009] The guiding mechanism includes a mounting base, a storage space, a discharge channel, at least one input guide, at least one output guide, at least one filter screen, and an opening and closing assembly. The mounting base is installed on the end of the rotating arm near the slag discharge port. The storage space is opened on the mounting base, and the discharge channel is opened on the mounting base, connecting the storage space to an external space. At least one input guide is installed on the water-facing side of the mounting base and is used to guide sewage and scum into the storage space. At least one output guide is installed on the back-water side of the mounting base and is used to discharge sewage from the storage space. At least one filter screen is installed on the mounting base and covers at least one output guide, and is arranged in a one-to-one correspondence with at least one output guide. The opening and closing assembly is installed on the end of the rotating arm near the slag discharge port.

[0010] The opening and closing component has a closed state that abuts against the mounting base and an open state that abuts against the slag discharge port.

[0011] Optionally, the opening and closing assembly includes at least one elastic connector, a movable block, and a first guide surface. At least one of the elastic connectors is installed at the end of the rotating arm near the slag discharge port, and the movable block is installed at the end of at least one elastic connector away from the rotating arm. The first guide surface is formed on the movable block and is used to guide the movable block to move toward the rotating arm.

[0012] Optionally, the elastic connector includes a telescopic rod and an elastic structure. The telescopic rod is installed between the rotating arm and the moving block, and the elastic structure is sleeved on the telescopic rod and abuts against the rotating arm and the moving block.

[0013] Optionally, the mounting base includes a base body and two base plates, both of which are connected to the base body and together with the base body form the storage space, and are spaced apart, with the discharge channel located between the two base plates;

[0014] The movable block includes an intermediate block, a limiting block, and a sealing block. The intermediate block is mounted on at least one end of the elastic connector near the slag discharge port. The limiting block is connected to the intermediate block and configured to abut against the base plate near the input guide via the elastic connector in the closed state. The sealing block is connected to the intermediate block and configured to abut against the base plate near the output guide via the elastic connector in the closed state.

[0015] Optionally, the limiting block has a first inclined surface, which is used to guide scum from the intermediate block to the bottom plate near the input guide, and the sealing block has a second inclined surface, which is used to guide scum from the sealing block to the intermediate block.

[0016] Optionally, the mounting base includes a base body and multiple floating structures, all of which are snapped into the base body.

[0017] Optionally, the mounting base includes a base body and a second guide surface, the second guide surface being formed in the base body and used to guide the base body to move toward the rotating arm.

[0018] Optionally, the mounting base includes a base body and a plurality of first suspension members, all of which are mounted between the base body and the rotating arm;

[0019] The first suspension component includes a first hinge rod and a second hinge rod, the first hinge rod being hinged to the rotating arm, and the second hinge rod being hinged between the seat and the first hinge rod.

[0020] Optionally, the scraper includes a float, a baffle, and a plurality of second suspension members, wherein the baffle is mounted on the float, and the plurality of second suspension members are all mounted between the rotating arm and the float;

[0021] The second suspension member includes a third hinge rod and a fourth hinge rod, the third hinge rod being hinged to the rotating arm, and the fourth hinge rod being hinged between the float and the third hinge rod.

[0022] Optionally, the slag discharge port includes a housing, an opening, and multiple support rods. The housing is installed on the wall of the pool body, the opening is formed in the housing, and the multiple support rods are all installed in the housing and located at the opening, and are also configured to support the opening and closing assembly in the open state. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A first-view perspective perspective view of a scum removal device for a secondary sedimentation tank in wastewater treatment provided in this application;

[0025] Figure 2A second-view perspective perspective view of a scum removal device for a secondary sedimentation tank in wastewater treatment provided in this application;

[0026] Figure 3 This application provides a partial first-view perspective perspective view of a scum removal device for a secondary sedimentation tank in wastewater treatment.

[0027] Figure 4 This application provides a partial perspective view of a scum removal device for a secondary sedimentation tank in wastewater treatment.

[0028] Figure 5 A perspective view of the guiding mechanism of a scum removal device for a secondary sedimentation tank in wastewater treatment provided in this application;

[0029] Figure 6 A cross-sectional view of the guide mechanism of a scum removal device for a secondary sedimentation tank in wastewater treatment provided in this application;

[0030] Figure 7 for Figure 2 A magnified view of a section at point A in the middle;

[0031] Figure 8 A perspective view of the scum discharge port of a scum removal device for a secondary sedimentation tank in wastewater treatment provided in this application.

[0032] The following are the labeling elements in the figure:

[0033] 1. Pool body;

[0034] 2. Slag discharge port; 21. Shell; 22. Opening; 23. Supporting rod;

[0035] 3. Rotating mechanism; 31. Driver; 32. Rotating arm; 33. Roller;

[0036] 4. Scraper; 41. Float; 42. Baffle; 43. Second suspension component; 431. Third hinge rod; 432. Fourth hinge rod;

[0037] 5. Guiding mechanism; 51. Mounting base; 511. Seat body; 512. Base plate; 513. Floating structure; 514. Second guiding surface; 515. First suspension component; 5151. First hinge rod; 5152. Second hinge rod; 52. Storage space; 53. Discharge channel; 54. Input guide; 55. Output guide; 56. Filter screen; 57. Opening and closing assembly; 571. Elastic connector; 5711. Telescopic rod; 5712. Elastic structure; 572. Moving block; 5721. Intermediate block; 5722. Limiting block; 5723. Sealing block; 5724. First inclined surface; 5725. Second inclined surface; 573. First guiding surface. Detailed Implementation

[0038] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0039] It should be noted that when a component is referred to as being "mounted to," "fixed to," or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0040] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, 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 application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0042] like Figures 1 to 8As shown, this application provides a scum removal device for a secondary sedimentation tank in wastewater treatment, including a tank body 1, a scum discharge port 2, a rotating mechanism 3, a scraper 4, and a guiding mechanism 5. The scum discharge port 2 is installed on the tank wall of the tank body 1. The rotating mechanism 3 includes a driver 31 and a rotating arm 32. The driver 31 is installed inside the tank body 1, and the rotating arm 32 is installed on the driver 31 and rotates around the axis of the tank body 1 under the drive of the driver 31. The scraper 4 is installed on the rotating arm 32 and rotates with the rotating arm 32. The guiding mechanism 5 includes a mounting base 51, a receiving space 52, a discharge channel 53, at least one input guide 54, at least one output guide 55, at least one filter screen 56, and an opening and closing assembly 57. The mounting base 51 is installed at one end of the rotating arm 32 near the slag discharge port 2. The receiving space 52 is opened in the mounting base 51. The discharge channel 53 is opened in the mounting base 51 and connects the receiving space 52 to the external space. At least one input guide 54 is installed on the water-facing side of the mounting base 51 and is used to guide sewage and scum into the receiving space 52. At least one output guide 55 is installed on the back water-facing side of the mounting base 51 and is used to discharge sewage from the receiving space 52. At least one filter screen 56 is installed in the mounting base 51 and covers at least one output guide 55, and is set one-to-one with at least one output guide 55. The opening and closing assembly 57 is installed at one end of the rotating arm 32 near the slag discharge port 2. The opening and closing component 57 has a closed state that abuts against the mounting base 51 and an open state that abuts against the slag discharge port 2.

[0043] It should be noted that the axes mentioned above and below refer to the bidirectional direction of the centerline defined by the structure of pool body 1 itself, as detailed below. Figure 1 The X-axis is shown in the figure.

[0044] This application provides a scum removal device for a secondary sedimentation tank in wastewater treatment. Driven by a driver 31, the rotating arm 32 drives a scraper 4 to rotate, causing the scraper 4 to clean the scum on the water surface while performing circular motion, and gathering the scum on the water-facing side of the scraper 4. Under the action of the input guide 54, wastewater can flow from the gap between the scraper 4 and the tank wall 1 to the collection space 52, and also from the gap between the scraper 4 and the scum discharge port 2 to the collection space 52. The water flow can send the scum into the collection space 52, thus preventing scum leakage and achieving good cleaning results. Under the action of the output guide 55, wastewater can flow from the collection space 52 to the back water side, preventing scum leakage due to insufficient space in the collection space 52. The filter screen 56 further prevents scum leakage under the action of the output guide 55. Under the action of the opening and closing component 57, it can remain closed when the mounting base 51 is not aligned with the slag discharge port 2 to prevent slag leakage; it can also remain open when the mounting base 51 is aligned with the slag discharge port 2 to transport slag into the slag discharge port 2. In summary, the combined action of the above components can prevent slag leakage and achieve good cleaning results.

[0045] Optionally, the rotating mechanism 3 also includes a plurality of rollers 33, all of which are mounted on the end of the rotating arm 32 away from the driver 31.

[0046] With this configuration, the direct contact between the rotating arm 32 and the tank body 1, caused by the roller 33, can be avoided, which would make it difficult for the rotating arm 32 to rotate. This makes it easier for the rotating arm 32 to drive the scraper 4 to rotate, making it more convenient for the scraper 4 to clean the scum.

[0047] Optionally, the mounting base 51 is also provided with at least one mounting slot (not shown in the figure), and at least one mounting slot and at least one filter 56 are provided in a one-to-one correspondence.

[0048] With this configuration, the mounting slot can be used to install the filter screen 56, preventing the filter screen 56 from protruding from the surface of the mounting base 51 and interfering with the movement of the moving block 572, thus facilitating the movement of the moving block 572.

[0049] In one embodiment of this application, please refer to Figures 1 to 8 The opening and closing assembly 57 includes at least one elastic connector 571, a moving block 572 and a first guide surface 573. At least one elastic connector 571 is installed at one end of the rotating arm 32 near the slag discharge port 2, and the moving block 572 is installed at one end of the at least one elastic connector 571 away from the rotating arm 32. The first guide surface 573 is formed on the moving block 572 and is used to guide the moving block 572 to move toward the rotating arm 32.

[0050] It should be noted that in this embodiment, the example given is that the number of elastic connectors 571 is two. Of course, in other embodiments, the number of elastic connectors 571 can also be one, three, four, etc., and is not limited here.

[0051] With this configuration, under the action of the elastic connector 571, when the mounting base 51 is not aligned with the slag discharge port 2, the moving block 572 can be held against the mounting base 51 to close the discharge channel 53, thereby preventing slag leakage and providing a good sealing effect. Under the action of the first guide surface 573, when the mounting base 51 is aligned with the slag discharge port 2, the moving block 572 can be guided to move towards the rotating arm 32 to open the discharge channel 53, thereby allowing the slag in the receiving space 52 to be transported into the slag discharge port 2. In summary, under the combined action of the elastic connector 571, the moving block 572, and the first guide surface 573, the opening and closing assembly 57 can switch between the closed and open states easily without relying on electronic components or manual intervention, thus improving ease of use.

[0052] In one embodiment of this application, please refer to the following: Figures 1 to 8 The elastic connector 571 includes a telescopic rod 5711 and an elastic structure 5712. The telescopic rod 5711 is installed between the rotating arm 32 and the moving block 572, and the elastic structure 5712 is sleeved on the telescopic rod 5711 and abuts against the rotating arm 32 and the moving block 572.

[0053] With this configuration, the telescopic rod 5711 will not interfere with the movement of the moving block 572, making it easier for the moving block 572 to move. Furthermore, the telescopic rod 5711 can also guide the movement of the moving block 572, ensuring that the moving block 572 can only move along the axis of the pool body 1. This helps to improve the stability of the movement of the moving block 572 and prevents the moving block 572 from shifting, which would cause the sealing effect of the opening and closing assembly 57 to deteriorate in the closed state.

[0054] Optionally, the elastic structure 5712 is configured as a spring.

[0055] In one embodiment of this application, see [reference] Figures 1 to 8The mounting base 51 includes a base body 511 and two base plates 512. Both base plates 512 are connected to the base body 511 and together with the base body 511 form a storage space 52, which are spaced apart. The discharge channel 53 is located between the two base plates 512. The moving block 572 includes a middle block 5721, a limiting block 5722, and a sealing block 5723. The middle block 5721 is mounted on at least one elastic connector 571 near the slag discharge port 2. The limiting block 5722 is connected to the middle block 5721 and is configured to abut against the base plate 512 near the input guide 54 via the elastic connector 571 in the closed state. The sealing block 5723 is connected to the middle block 5721 and is configured to abut against the base plate 512 near the output guide 55 via the elastic connector 571 in the closed state.

[0056] With this configuration, the moving block 5722 and the sealing block 5723 work together, and the two base plates 512 prevent the moving block 572 from detaching from the receiving space 52 under the action of the elastic structure 5712. This avoids interference between the moving block 572 and the slag discharge port 2, preventing the moving block 572 from moving. Furthermore, with the combined action of the limiting block 5722, the intermediate block 5721, and the sealing block 5723, the moving block 5722 and the elastic structure 5712 tightly abut against the two base plates 512 to close the discharge channel 53, thus preventing slag leakage and providing a good sealing effect. With the sealing block 5723 in place, compared to not having the sealing block 5723, the scum can be prevented from leaking from the space between the middle block 5721 and the bottom plate 512 near the output guide 55 when the discharge channel 53 is open. The sealing effect is good, so that the scum can only be transported to the scum discharge port 2 from the space between the limiting block 5722 and the bottom plate 512 near the input guide 54, thus preventing the scum from leaking when the opening and closing component 57 switches from the closed state to the open state.

[0057] In one embodiment of this application, please refer to Figures 1 to 8 The limiting block 5722 has a first inclined surface 5724, which is used to guide the scum from the middle block 5721 to the bottom plate 512 near the input guide 54. The sealing block 5723 has a second inclined surface 5725, which is used to guide the scum from the sealing block 5723 to the middle block 5721.

[0058] With this configuration, when the opening and closing component 57 is in the open state, it can quickly transport the scum on the surface of the moving block 572 to the scum discharge port 2 through the first inclined surface 5724 and the second inclined surface 5725, which helps to speed up the efficiency of transporting the scum to the scum discharge port 2.

[0059] In one embodiment of this application, please refer to the following: Figures 1 to 8The mounting base 51 includes a base body 511 and multiple floating structures 513, all of which are snapped into the base body 511.

[0060] With this configuration, when the opening and closing component 57 is in the closed state, the seat 511 can float on the surface of the sewage through multiple floating structures 513, thus preventing the guide mechanism 5 from being submerged in the sewage and causing the guide mechanism 5 to fail.

[0061] In one embodiment of this application, see [reference] Figures 1 to 8 The mounting base 51 includes a base body 511 and a second guide surface 514. The second guide surface 514 is formed in the base body 511 and is used to guide the base body 511 to move toward the rotating arm 32.

[0062] With this configuration, under the action of the second guide surface 514, the seat 511 can be guided to move toward the rotating arm 32 when it comes into contact with the slag discharge port 2, so that the seat 511 can move above the slag discharge port 2.

[0063] In one embodiment of this application, please refer to Figures 1 to 8 The mounting base 51 includes a base body 511 and a plurality of first suspension members 515, all of which are mounted between the base body 511 and the rotating arm 32. Each first suspension member 515 includes a first hinge rod 5151 and a second hinge rod 5152. The first hinge rod 5151 is hinged to the rotating arm 32, and the second hinge rod 5152 is hinged between the base body 511 and the first hinge rod 5151.

[0064] This configuration, under the action of the first hinge rod 5151 and the second hinge rod 5152, allows the seat body 511 to be suspended from the rotating arm 32, which helps improve the structural stability between the seat body 511 and the rotating arm 32. Furthermore, under the action of the first hinge rod 5151 and the second hinge rod 5152, the seat body 511 can move relative to the rotating arm 32, making it suitable for different liquid levels and thus having a wide range of applications. In addition, having multiple first suspension members 515, compared to having only one, further helps to improve the structural stability between the seat body 511 and the rotating arm 32.

[0065] In one embodiment of this application, please refer to the following: Figures 1 to 8 The scraper 4 includes a float 41, a baffle 42, and multiple second suspension members 43. The baffle 42 is installed on the float 41, and the multiple second suspension members 43 are all installed between the rotating arm 32 and the float 41. The second suspension member 43 includes a third hinge rod 431 and a fourth hinge rod 432. The third hinge rod 431 is hinged to the rotating arm 32, and the fourth hinge rod 432 is hinged between the float 41 and the third hinge rod 431.

[0066] This configuration allows the float 41 to collect scum from the wastewater surface during scum removal, facilitating collection by the guiding mechanism 5. The baffle 42 prevents leakage of the collected scum from the bottom of the float 41, resulting in good collection efficiency. The third and fourth hinge rods 431 and 432 contribute to improved structural stability between the float 41 and the rotating arm 32. Furthermore, the float 41 can move relative to the rotating arm 32 under the influence of these two hinge rods, making it suitable for different liquid levels and offering a wide range of applications. In addition, having multiple second suspension members 43, compared to having only one, further enhances the structural stability between the float 41 and the rotating arm 32.

[0067] In one embodiment of this application, see [reference] Figures 1 to 8 The slag discharge port 2 includes a housing 21, an opening 22 and multiple support rods 23. The housing 21 is installed on the wall of the pool body 1, the opening 22 is opened in the housing 21, and the multiple support rods 23 are all installed in the housing 21 and located at the opening 22. They are also configured to support the opening and closing assembly 57 when in the open state.

[0068] With this configuration, the scum can be transported to external processing equipment under the action of the housing 21. Under the action of multiple support rods 23, the support body 511 can be supported and the moving block 572 can be limited, preventing the moving block 572 from moving into the housing 21 and causing the discharge channel 53 to close.

[0069] The working principle of the scum removal device for secondary sedimentation tanks in wastewater treatment provided in this application is as follows:

[0070] When cleaning scum, the actuator 31 drives the rotating arm 32 to rotate around the axis of the tank body 1, and the rotating arm 32 drives the float 41 and the guide mechanism 5 to rotate. Under the action of the float 41 and the baffle 42, the scum in the area through which the float 41 passes can be gathered.

[0071] When the seat 511 is not aligned with the slag discharge port 2, the wastewater flows from the gap between the pool wall and the scraper 4 into the receiving space 52 through the input guide 54, and the scum follows the water flow into the receiving space 52; through the output guide 55, the wastewater flows from the receiving space 52 to the back water side of the seat 511, and so on, until the seat 511 and the slag discharge port 2 come into contact. During this process, the opening and closing component 57 is always in the closed state, that is, the moving block 572 blocks the discharge channel 53.

[0072] After the seat 511 contacts the slag discharge port 2, the driver 31 continues to drive the rotating arm 32 to rotate. Under the action of the second guide surface 514, the seat 511 gradually moves towards the rotating arm 32 until the seat 511 is supported above the slag discharge port 2. The driver 31 continues to drive the rotating arm 32 to rotate until the moving block 572 contacts the slag discharge port 2. Under the action of the first guide surface 573, the moving block 572 gradually moves towards the rotating arm 32 until the moving block 572 is supported above the support rod 23. During this process, the opening and closing component 57 switches from the closed state to the open state, that is, the moving block 572 cannot block the discharge channel 53.

[0073] After the base 511 is aligned with the slag discharge port 2, the remaining wastewater in the receiving space 52 is transported from the discharge channel 53 to the shell 21, and then transported to the external treatment equipment through the shell 21. Under the action of the water flow, the scum moves from the receiving space 52 to the shell 21 with the water flow. During this process, the opening and closing component 57 remains in the open state.

[0074] After cleaning, the driver 31 continues to drive the rotating arm 32 to rotate until the seat 511 and the slag discharge port 2 separate, and the seat 511 and the moving block 572 reset in sequence. During this process, the opening and closing component 57 switches from the open state to the closed state.

[0075] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A device for cleaning scum from a secondary sedimentation tank in wastewater treatment, characterized in that, include: pool(1); Slag discharge port (2) is installed on the wall of the pool body (1); Rotating mechanism (3), the rotating mechanism (3) includes a driver (31) and a rotating arm (32), the driver (31) is installed inside the pool body (1), the rotating arm (32) is installed on the driver (31), and rotates around the axis of the pool body (1) under the drive of the driver (31); The scraper (4) is mounted on the rotating arm (32) and rotates with the rotating arm (32); The guiding mechanism (5) includes a mounting base (51), a storage space (52), a discharge channel (53), at least one input guide (54), at least one output guide (55), at least one filter screen (56), and an opening and closing assembly (57). The mounting base (51) is installed on one end of the rotating arm (32) near the slag discharge port (2). The storage space (52) is opened on the mounting base (51). The discharge channel (53) is opened on the mounting base (51) and connects the storage space (52) to the external space. At least one input guide... The device (54) is installed on the water-facing side of the mounting base (51) and is used to guide sewage and scum into the receiving space (52). At least one of the output guides (55) is installed on the back side of the mounting base (51) and is used to discharge sewage from the receiving space (52). At least one of the filter screens (56) is installed on the mounting base (51) and covers at least one of the output guides (55), and is set in a one-to-one correspondence with at least one of the output guides (55). The opening and closing assembly (57) is installed on one end of the rotating arm (32) near the scum discharge port (2). The opening and closing component (57) has a closed state that abuts against the mounting base (51) and an open state that abuts against the slag discharge port (2); The opening and closing assembly (57) includes at least one elastic connector (571), a moving block (572), and a first guide surface (573). At least one of the elastic connectors (571) is installed at one end of the rotating arm (32) near the slag discharge port (2), and the moving block (572) is installed at one end of the elastic connector (571) away from the rotating arm (32). The first guide surface (573) is formed on the moving block (572) and is used to guide the moving block (572) to move toward the rotating arm (32).

2. The scum removal device for a secondary sedimentation tank in wastewater treatment as described in claim 1, characterized in that, The elastic connector (571) includes a telescopic rod (5711) and an elastic structure (5712). The telescopic rod (5711) is installed between the rotating arm (32) and the moving block (572). The elastic structure (5712) is sleeved on the telescopic rod (5711) and abuts against the rotating arm (32) and the moving block (572).

3. The scum removal device for a secondary sedimentation tank in wastewater treatment as described in claim 1, characterized in that, The mounting base (51) includes a base body (511) and two base plates (512). The two base plates (512) are connected to the base body (511) and together with the base body (511) form the storage space (52), and are spaced apart. The discharge channel (53) is located between the two base plates (512). The movable block (572) includes an intermediate block (5721), a limiting block (5722), and a sealing block (5723). The intermediate block (5721) is mounted on at least one of the elastic connectors (571) near the slag discharge port (2). The limiting block (5722) is connected to the intermediate block (5721) and is configured to abut against the base plate (512) near the input guide (54) in the closed state via the elastic connector (571). The sealing block (5723) is connected to the intermediate block (5721) and is configured to abut against the base plate (512) near the output guide (55) in the closed state via the elastic connector (571).

4. The scum removal device for a secondary sedimentation tank in wastewater treatment as described in claim 3, characterized in that, The limiting block (5722) has a first inclined surface (5724) for guiding scum from the intermediate block (5721) to the bottom plate (512) near the input guide (54). The sealing block (5723) has a second inclined surface (5725) for guiding scum from the sealing block (5723) to the intermediate block (5721).

5. The scum removal device for a secondary sedimentation tank in wastewater treatment as described in claim 1, characterized in that, The mounting base (51) includes a base body (511) and a plurality of floating structures (513), all of which are snapped into the base body (511).

6. The scum removal device for a secondary sedimentation tank in wastewater treatment as described in claim 1, characterized in that, The mounting base (51) includes a base (511) and a second guide surface (514), the second guide surface (514) being formed in the base (511) and used to guide the base (511) to move toward the rotating arm (32).

7. The scum removal device for a secondary sedimentation tank in wastewater treatment as described in claim 1, characterized in that, The mounting base (51) includes a base body (511) and a plurality of first suspension members (515), all of which are installed between the base body (511) and the rotating arm (32). The first suspension member (515) includes a first hinge rod (5151) and a second hinge rod (5152). The first hinge rod (5151) is hinged to the rotating arm (32), and the second hinge rod (5152) is hinged between the seat (511) and the first hinge rod (5151).

8. The scum removal device for a secondary sedimentation tank in wastewater treatment as described in claim 1, characterized in that, The scraper (4) includes a float (41), a baffle (42) and a plurality of second suspension members (43). The baffle (42) is installed on the float (41), and the plurality of second suspension members (43) are installed between the rotating arm (32) and the float (41). The second suspension member (43) includes a third hinge rod (431) and a fourth hinge rod (432), the third hinge rod (431) being hinged to the rotating arm (32), and the fourth hinge rod (432) being hinged between the float (41) and the third hinge rod (431).

9. The scum removal device for a secondary sedimentation tank in wastewater treatment as described in claim 1, characterized in that, The slag discharge port (2) includes a housing (21), an opening (22) and a plurality of support rods (23). The housing (21) is installed on the wall of the pool body (1). The opening (22) is opened in the housing (21). The plurality of support rods (23) are all installed in the housing (21) and located at the opening (22). They are also configured to support the opening and closing assembly (57) in the open state.

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