Secondary sedimentation tank scum discharging device and scum cleaning system

Abstract

The invention belongs to the technical field of sewage treatment, and particularly discloses a secondary sedimentation tank scum discharging device and a scum cleaning system.The secondary sedimentation tank scum discharging device comprises a rack, a supporting frame, a scum tank and a scum discharging pipe, one end of the scum discharging pipe is communicated with the bottom of the scum tank, the scum tank is fixedly connected with the supporting frame, and the scum discharging pipe is connected with the supporting frame; the rack is fixedly mounted on the inner side surface of an effluent weir of a secondary sedimentation tank, the support frame is connected with the rack, a scum inlet in the top of the scum tank is lower than the water surface of the secondary sedimentation tank, and a valve is mounted on the scum discharge pipe; a scum cleaning system of a secondary sedimentation tank comprises a scum scraping plate and a scum discharging device of the secondary sedimentation tank, a center support is located in the center of the secondary sedimentation tank, the top of the center support is connected with a platform, and the scum scraping plate is connected with the center support in a circumferential rotating mode. The maintenance cost can be reduced, and frequent lifting of the scum tank is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a scum discharge device and a scum cleaning system for a secondary sedimentation tank. Background Art

[0002] In the sewage treatment process, it is inevitable that there will be scum on the surface of the radial flow secondary sedimentation tank during daily operation. Its main components are: floating impurities from the biochemical system, foam, a small amount of nitrification sludge and anaerobic sludge, etc.

[0003] The scum in the secondary sedimentation tank not only affects the appearance, but also directly affects the SS index of the effluent. The removal of scum on the surface of the existing radial flow secondary sedimentation tank is usually done by using the scraper plate provided on the rotary suction scraper, which cooperates with the scum trough (also called scum bucket) installed on the inner side of the effluent weir in the secondary sedimentation tank to discharge the scum.

[0004] Among them, the scraper plate is located on the surface of the secondary sedimentation tank as a whole and can rotate around the central support of the secondary sedimentation tank. A scraper rake made of soft rubber is fixed on the outer end of the scraper plate away from the central support of the secondary sedimentation tank. The slag inlet on the top of the slag bucket is slightly higher than the liquid level on the tank surface. When in use, the scum on the surface of the secondary sedimentation tank is swept into the slag bucket for collection under the drag of the scraper rake. Then, the scum mixed liquid is either completely returned to the low-zone pump station in the plant through the pipeline, or a bypass integrated scum separator is set up. The inorganic scum with larger particle size is separated and squeezed and disposed together with the pre-treatment section grid slag, and the separated liquid is returned to the low-zone pump station in the plant.

[0005] However, in actual operation, the traditional secondary sedimentation tank slag collection and disposal system has certain shortcomings:

[0006] The traditional scum collection method that relies on the scraper fixed on the rotary suction scraper to push the scum into the scum bucket fixed on the pool wall is not ideal for removing scum on the pool surface (removal rate is less than 50%). Scum always exists in the secondary sedimentation tank and continues to float on the pool surface with the rotary motion of the scraper, which is difficult to be swept into the scum bucket by the scraper rake, which not only affects the cleanliness and appearance of the pool surface, but also affects the stability of the SS index of the effluent. In the existing technology, the scum must be cleaned by manual salvage, which is frequent and labor-intensive, and must be operated close to the pool side during cleaning, which poses a safety hazard.

[0007] In order to solve the above technical problems, the invention patent with the publication number CN207126186U in the prior art discloses an installation structure of a scum trough in a secondary sedimentation tank, which includes a guide rail, a sliding member, a support frame and a lifting drive; the guide rail is vertically and fixedly installed on the inner side of the effluent weir of the secondary sedimentation tank; the sliding member is slidably assembled on the guide rail along the guide rail; a scum trough is fixedly installed on the support frame, and the side end of the support frame is fixedly connected to the sliding member; the lifting drive is integrally fixedly installed on the effluent weir of the secondary sedimentation tank, and the axial direction of the drive shaft of the lifting drive is parallel to the length direction of the guide rail, the drive shaft faces downward and the lower end is fixedly connected to the support frame.

[0008] The above patent has a better scum removal effect. After being matched with the outer end of the scum scraping plate, the effect of removing scum can be more ideal. In the above solution, the support frame is driven by the lifting drive to move vertically along the guide rail, so that the scum trough installed on the support frame can be lifted up and down, so that the slag inlet at the top of the scum trough fixedly installed on the support frame can be higher or lower than the pool surface of the secondary sedimentation tank. In this way, when the slag inlet at the top of the scum trough is higher than the pool surface of the secondary sedimentation tank, the water in the secondary sedimentation tank can be prevented from entering the scum trough; when the slag inlet at the top of the scum trough is lower than the pool surface of the secondary sedimentation tank, the water on the pool surface around the slag inlet can carry the scum (under the action of the liquid level difference) and quickly flow into the scum trough, so as to obtain a better scum removal effect. However, the above patent also has deficiencies: First, the scum scraping plate discharges scum once every turn, and each time scum is discharged, it is necessary to drive the support frame to lift up and down, resulting in the scum trough rising and falling relatively frequently along with the support frame along the guide rail, and each structure is prone to damage after long-term use and needs to be repaired; Second, since water vapor is generated in the secondary sedimentation tank, it is easy to cause the machine (such as the lifting drive) to be affected by the water vapor and malfunction and damage; Third, during the rotation of the scum scraping plate in the above patent, the scum trough is prone to lift and lower in advance or lag, resulting in an excessive amount of scum mixed liquid or a too short scum collection time, affecting the cleaning effect of the scum.

[0009] Based on this, the present application has made further improvements. Summary of the Invention

[0010] The present invention provides a scum discharging device and a scum cleaning system for a secondary sedimentation tank, aiming to reduce the maintenance cost and avoid the frequent lifting of the scum trough.

[0011] The present invention is realized through the following technical solutions: A scum discharging device for a secondary sedimentation tank includes a frame, a support frame, a scum trough and a slag discharge pipe. One end of the slag discharge pipe is communicated with the bottom of the scum trough. The scum trough is fixedly connected to the support frame. The frame is fixedly installed on the inner side of the effluent weir of the secondary sedimentation tank. The support frame is connected to the frame. The slag inlet at the top of the scum trough is lower than the water surface of the secondary sedimentation tank. A valve is installed on the slag discharge pipe.

[0012] Further, one end of the support frame is connected with a lifting frame, the lifting frame is vertically slidably matched with the machine frame, and a driving unit for driving the lifting frame to lift is arranged on the machine frame.

[0013] Further, the machine frame includes two slide rails and a top plate, two ends of the top plate are respectively connected with the two slide rails, and the lifting frame is vertically slidably matched with the two slide rails.

[0014] Further, guiding members are arranged on the two slide rails along their vertical directions, sliding members are connected to both ends of the lifting frame, and the sliding members at both ends of the lifting frame are respectively vertically slidably matched with the guiding members on the two slide rails.

[0015] Further, the guiding member is a guiding groove formed on the slide rail or a guiding strip fixed on the slide rail.

[0016] Further, the driving unit includes a first screw rod, the first screw rod sequentially passes through the machine frame and the lifting frame, and the first screw rod is in threaded connection with the lifting frame.

[0017] Further, a second screw rod is vertically connected to the top of the machine frame, the second screw rod is in threaded connection with the top of the machine frame, and the bottom end of the second screw rod can abut against the lifting frame.

[0018] Further, the slag discharge pipe includes a straight pipe section and a corrugated pipe section, one end of the corrugated pipe section is communicated with the bottom of the scum trough, the other end of the corrugated pipe section is communicated with the straight pipe section, and the valve is installed on the straight pipe section.

[0019] A secondary sedimentation tank scum cleaning system includes a scum scraping plate, a central support and a secondary sedimentation tank scum discharging device as described above. The central support is located at the center of the secondary sedimentation tank, a platform is connected to the top of the central support, and the scum scraping plate is circumferentially rotatably connected to the central support.

[0020] Further, it further includes a sensor and a controller. The sensor and the valve are both electrically connected to the controller. The sensor is installed on the platform, the sensor is located above the scum scraping plate, the radial extension line of the sensor is close to the scum trough. When the scum scraping plate moves to directly below the sensor and is recognized by the sensor, the sensor sends a signal to the controller, and the controller controls the valve to open.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] 1. In this scheme, the slag inlet at the top of the slag tank is lower than the water surface of the secondary sedimentation tank, which can ensure that the water in the secondary sedimentation tank can flow into the slag tank from the slag inlet at the top of the slag tank, and be discharged to the designated position through the slag discharge pipe. Since the slag discharge pipe is equipped with a valve, when the slag is pushed by the scraper plate and collected to the slag inlet of the slag tank, the valve is opened, that is, the pool surface water around the slag inlet can carry the slag and quickly flow into the slag tank under the action of the liquid level difference and the gravity of the slag mixed liquid, thereby achieving the slag removal effect. When the slag is discharged this time, the water in the pool is no longer discharged by closing the valve, avoiding the continued discharge of water in the secondary sedimentation tank and causing waste.

[0023] 2. Compared with the prior art, each time the scum is discharged, the support frame and the scum tank need to be driven up and down, which easily affects the service life of each structure and increases the maintenance cost. In the present invention, the scum inlet at the top of the scum tank is lower than the water surface of the secondary sedimentation tank. In this way, the state of the scum tank is relatively stable, and it is not necessary to lift and lower it every time the scum is discharged to cooperate with the scum discharge and prevent the water in the tank from continuing to flow in;

[0024] The slag inlet at the top of the slag tank of the present invention is lower than the water surface of the secondary sedimentation tank. When the slag scraper is used in conjunction with the valve, when the slag scraper rotates one circle to discharge slag, it is not necessary to drive the slag tank to rise and fall. It is only necessary to open the valve to generate a liquid level difference between the pool surface and the inside of the slag tank, so that the slag on the pool surface and water are mixed and enter the slag tank to take out the slag. After each slag discharge, the water in the pool can be stopped from continuing to flow in by closing the valve.

[0025] Since the present invention does not need to frequently drive the slag trough to rise and fall, the service life of each component is effectively prolonged and the maintenance cost is reduced.

[0026] 3. The driving unit in the present invention drives the lifting frame to slide vertically with the frame, so that the position of the scum tank can be adjusted accordingly according to the different water levels in the secondary sedimentation tank, so that the scum tank maintains the best draft effect.

[0027] The installation depth of the scum trough can be adjusted according to the different seasons or the different water levels in the secondary sedimentation tank to meet the optimal usage requirements in different environments of high water volume and dry season.

[0028] 4. The lifting frame of the present invention can improve the stability of the lifting movement of the slag trough and the support frame through the cooperation of the sliding member and the two slide rails.

[0029] 5. The second screw in the present invention can limit the scum groove, thereby preventing the scum groove from floating up under the action of buoyancy and affecting the smooth cleaning of the scum.

[0030] 6. The floating scum cleaning system of the present invention is used in conjunction with a floating scum discharging device for a secondary sedimentation tank. By adding sensors, when the slag scraping plate is about to reach the floating scum tank, the valve can be opened in advance through the controller, enabling the floating scum to start being discharged. Compared with the situation where the valve is opened only after the slag scraping plate reaches the floating scum tank, resulting in too short a floating scum collection time, causing a large amount of floating scum to remain in the secondary sedimentation tank without being smoothly collected, or the valve is opened when the slag scraping plate is too far from the floating scum tank, causing a large amount of water in the secondary sedimentation tank to be drained away, this solution can prevent the slag discharge pipe at the bottom of the floating scum tank from being opened and connected in advance or lagging behind, resulting in too large a volume of floating scum mixture or too short a floating scum collection time, affecting the cleaning effect of the floating scum.

[0031] 7. In the present invention, the use of a lifting drive to drive the lifting of the support frame and the floating scum tank in the prior art is abandoned, which can avoid the situation where the internal components are damaged by moisture due to the influence of the water vapor in the secondary sedimentation tank on the lifting drive, reducing the maintenance cost and economic cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0033] Figure 1 It is a schematic installation structure diagram of an embodiment of a floating scum discharging device for a secondary sedimentation tank of the present invention;

[0034] Figure 2 It is a front view of the cooperation among the frame, the lifting frame and the first screw rod in an embodiment of a floating scum discharging device for a secondary sedimentation tank of the present invention;

[0035] Figure 3 It is a front view of the cooperation among the frame, the lifting frame, the first screw rod and the second screw rod in another embodiment of a floating scum discharging device for a secondary sedimentation tank of the present invention;

[0036] Figure 4 It is a top view of an embodiment of a floating scum cleaning system of the present invention.

[0037] Reference numerals in the drawings and corresponding component names:

[0038] Secondary sedimentation tank 1, floating scum tank 2, slag inlet 201, guide plate 202, support frame 3, frame 40, slide rail 4, guide groove 401, top plate 5, first screw rod 6, screw cap 601, first nut 602, lifting frame 7, sliding member 701, valve 8, slag discharge pipe 9, straight pipe section 901, corrugated pipe section 902, conveying pipe 10, second screw rod 11, second nut 110, central support 12, platform 13, slag scraping plate 14, mounting plate 15, sensor 16, floating scum baffle 17, connecting rod 18, bridge 19, water spraying pipe 20, nozzle 21, water outlet weir 22. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] To make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with embodiments and the accompanying drawings. The illustrative embodiments of the present invention and their descriptions are only used to explain the present invention and do not limit the present invention.

[0040] As an embodiment of the present application, as Figure 1 shown, a secondary sedimentation tank scum discharging device is provided, which includes a frame 40, a support frame 3, a scum trough 2 and a slag discharging pipe 9. One end of the slag discharging pipe 9 is communicated with the bottom of the scum trough 2. In this embodiment, a valve 8 is installed on the slag discharging pipe 9. The inlet end of the valve 8 is communicated with the slag discharging pipe 9, and the outlet end of the valve 8 is communicated with a conveying pipe 10. The conveying pipe 10 discharges the mixed liquid of discharged scum and water to a designated position for collection through a pipeline.

[0041] In this embodiment, the lower part of the scum trough 2 is funnel-shaped, which has a guiding effect on the inflowing scum and water flowing into the slag discharging pipe 9. The top of the scum trough 2 is a slag inlet 201. Guide plates 202 are welded and fixed on both sides of the slag inlet 201 of the scum trough 2. The guide plates 202 on both sides of the slag inlet 201 are both downwardly inclined plate-shaped structures, which is convenient for guiding the slag scraping of the slag scraping plate 14 when cooperating with the slag scraping plate 14.

[0042] The scum trough 2 is fixedly connected to the support frame 3. The support frame 3 in this embodiment is a rectangular hollow structure. The scum trough 2 is located inside the support frame 3 and is welded and fixed or connected by screws or bolts to the support frame 3; the frame 40 is fixedly installed on the inner side of the water outlet weir 22 of the secondary sedimentation tank 1 through screws or other existing fixing structures. The support frame 3 is connected to the frame 40. In this embodiment, the support frame 3 and the frame 40 are fixedly connected by welding or bolts.

[0043] In this embodiment, the slag inlet 201 at the top of the scum trough 2 is lower than the water surface of the secondary sedimentation tank 1, which can ensure that after the valve 8 is opened, the scum can enter the scum trough 2 and be discharged. In this embodiment, the distance between the slag inlet 201 at the top of the scum trough 2 and the water surface of the secondary sedimentation tank 1 is less than 1 cm.

[0044] As an embodiment of the present application, in combination with Figure 1 and Figure 2 shown, one end of the support frame 3 is connected with a lifting frame 7. In this embodiment, the support frame 3 and the lifting frame 7 are fixedly connected by welding or bolts. The lifting frame 7 is vertically slidably matched with the frame 40. A driving unit for driving the lifting frame 7 to lift is provided on the frame 40. Specifically: the frame 40 includes two slide rails 4 and a top plate 5. The two slide rails 4 are vertically arranged. The two ends of the top plate 5 are respectively welded and fixed or screwed to the top ends of the two slide rails 4. The two slide rails 4 are both fixed on the inner side of the water outlet weir 22 of the secondary sedimentation tank 1. The lifting frame 7 is vertically slidably matched with the two slide rails 4.

[0045] Guiding members are provided along the vertical directions of the two sliding rails 4. Sliding members 701 are connected to both ends of the lifting frame 7. The sliding members 701 at both ends of the lifting frame 7 are respectively in vertical sliding fit with the guiding members on the two sliding rails 4. Specifically: The guiding member is a guiding groove 401 opened on the sliding rail 4 or a guiding strip fixed on the sliding rail 4. The sliding member 701 is a structure matching the guiding member. In this embodiment, the guiding groove 401 is taken as an example for illustration. The guiding groove 401 is opened on one side where the two sliding grooves face each other. The sliding member 701 is a roller or a slider. The sliding member 701 is inserted into the guiding groove 401 and can slide vertically along the guiding groove 401. With the cooperation of the guiding groove 401 and the sliding member 701, the sliding of the lifting frame 7 can be guided, enabling the lifting frame 7 to smoothly perform the lifting adjustment movement.

[0046] When the guiding member is a guiding strip, the guiding strip is fixed on one side where the two sliding rails 4 face each other. The sliding member 701 is a structure matching the guiding strip, and the sliding member 701 slides along the guiding strip.

[0047] The driving unit in this embodiment includes a first screw rod 6. The first screw rod 6 sequentially passes through the machine frame 40 and the lifting frame 7, and the first screw rod 6 is threadedly connected to the lifting frame 7. Specifically: As shown in Figure 2 In this embodiment, a screw cap 601 is welded and fixed to the top end of the first screw rod 6. The setting of the screw cap 601 facilitates the screwing of the first screw rod 6. A through hole is opened on the top plate 5 of the machine frame 40. The first screw rod 6 passes through the top plate 5. The first screw rod 6 passes through the lifting frame 7 and is threadedly connected to the lifting frame 7. Or a first nut 602 is welded and fixed to the top of the lifting frame 7. The first screw rod 6 passes through the first nut 602 and is threadedly connected to the first nut 602. Compared with opening a threaded hole on the lifting frame 7 and threadedly connecting the first screw rod 6 to the lifting frame 7, this solution is simpler in processing and manufacturing by fixing the first nut 602 on the lifting frame 7.

[0048] In this embodiment, the first screw rod 6 is threadedly connected to the first nut 602, and the first nut 602 is fixed on the lifting frame 7. The two ends of the lifting frame 7 are restricted by the two sliding rails 4. Therefore, when the first screw rod 6 is rotated, the first nut 602 and the lifting frame 7 will move vertically along the first screw rod 6, thereby realizing the lifting movement of the lifting frame 7 driving the scum trough 2. In this way, the position of the scum trough 2 can be adaptively adjusted according to the different water levels of the secondary sedimentation tank 1, so that the scum trough 2 maintains the best water intake effect.

[0049] The slag discharge pipe 9 in this embodiment includes a straight pipe section 901 and a corrugated pipe section 902. One end of the corrugated pipe section 902 is communicated with the bottom of the scum trough 2, and the other end of the corrugated pipe section 902 is communicated with the straight pipe section 901. The valve 8 is installed on the straight pipe section 901. The corrugated pipe section 902 can expand and contract, so as to adapt to the lifting adjustment of the scum trough 2.

[0050] As an embodiment of the present application, the difference from the above embodiment is that: as Figure 3 shown, a second screw rod 11 is vertically connected to the top of the frame 40. The second screw rod 11 is threadedly connected to the top of the frame 40. The bottom end of the second screw rod 11 can abut against the lifting frame 7. Specifically: in this embodiment, the second screw rod 11 is located on one side of the first screw rod 6. A through hole is formed in the top plate 5 of the frame 40. A second nut 110 is welded and fixed to the bottom or top of the top plate 5 of the frame 40. The second screw rod 11 passes through the top plate 5 and the second nut 110 and is threadedly connected to the second nut 110. A screw cap is also fixed to the top end of the second screw rod 11.

[0051] By rotating the second screw rod 11, the height of the bottom of the second screw rod 11 can be changed. The second screw rod 11 can be adaptively adjusted according to the position of the lifting frame 7 on the slide rail 4, so that the bottom of the second screw rod 11 can abut against the top end of the lifting frame 7.

[0052] When the lifting frame 7 drives the scum trough 2 to be adjusted to a proper position, rotate the second screw rod 11, and the second screw rod 11 can move vertically and abut against the top end of the lifting frame 7 to prevent the scum trough 2 from floating up.

[0053] As another embodiment of the present application, as Figure 4 shown, a secondary sedimentation tank scum cleaning system is disclosed, which includes a slag scraping plate 14, a central support 12 and a secondary sedimentation tank scum discharging device as in the above embodiment. The frame 40 is fixedly installed inside the water outlet weir 22 of the secondary sedimentation tank 1. The central support 12 is located in the center of the secondary sedimentation tank 1. A platform 13 is connected to the top of the central support 12. The slag scraping plate 14 is circumferentially rotatably connected to the central support 12. The connection between the slag scraping plate 14 and the central support 12 adopts the existing structure of a sludge scraper in the secondary sedimentation tank 1 in the prior art. The slag scraping plate 14 can rotate one week along the central support 12, so as to collect the scum in the tank. A slag scraping rake is fixedly installed at one end of the slag scraping plate 14 far from the central support 12.

[0054] As an embodiment of the present application, on the basis of the previous embodiment, a secondary sedimentation tank scum cleaning system in this embodiment further includes a sensor 16 and a control system. The control system includes a PLC controller. The valve 8 is an electric valve. The sensor 16 and the valve 8 are both electrically connected to the controller. The sensor 16 is installed on the platform 13 and is located above the slag scraping plate 14. In this embodiment, a mounting plate 15 is horizontally welded and fixed to one side of the platform 13. A connecting rod 18 is vertically connected to the mounting plate 15. The sensor 16 is fixedly installed at the bottom of the connecting rod 18, and the installation position of the sensor 16 is above the slag scraping plate 14.

[0055] When the radial extension line of the sensor 16 is close to the scum tank 2 and the slag scraping plate 14 moves to directly below the sensor 16 and is recognized by the sensor 16, the sensor 16 sends a signal to the controller, and the controller controls the valve 8 to open in advance. At this time, the scum between the slag scraping plate 14 and the scum tank 2 will gradually flow toward the slag inlet 201 of the scum tank 2 and be discharged.

[0056] As an embodiment of the present application, on the basis of the previous embodiment, the control system in this embodiment includes a PLC controller, a plurality of relays, and a control touch screen. The control touch screen has an in-opening indicator light, an open-in-place indicator light, a closing indicator light, and a closed-in-place indicator light.

[0057] Through digital twin technology, the state of the scum tank 2 is displayed on the screen. When the slag scraping plate approaches the scum tank 2 and is sensed by the sensor 16, the sensor 16 feeds back a signal to the PLC controller in the control system, and the controller system starts to control the valve 8 to open. During the opening process, there will be an in-opening indicator light on the control touch screen in the control system. When it is fully opened, the open-in-place indicator light will be on.

[0058] After the skimming is completed, through the set opening time, when a certain time has passed and the scum is skimmed clean, the control system starts to control the valve 8 to close. During the closing process, the control touch screen will display the closing indicator light, and when it is closed in place, the control touch screen will display the closed-in-place indicator light.

[0059] In addition, the control system can be switched to automatic or manual. When the sensor 16 fails or in special cases, it can be switched to manual, and the valve 8 can be manually controlled to open and close on the control system screen without the intervention of the sensor 16.

[0060] As another embodiment of the present application, this embodiment provides another implementation manner for controlling the opening or closing of the valve 8. Specifically: In this embodiment, two sensors 16 are provided. One is the opening sensor 16 for opening the valve 8, and the other is the closing sensor for closing the valve 8. The closing sensor is located behind the opening sensor 16, and the installation position of the closing sensor 16 is on the side of the scum tank 2 away from the opening sensor 16. The path of the slag scraping plate 14 is: The slag scraping plate 14 first passes through the opening sensor 16, then gradually crosses the scum tank 2, and finally passes through the closing sensor. In this way, by adding a closing sensor at the back, when the slag scraping plate 14 finishes scraping the slag, crosses the scum tank 2, and the slag scraping plate 14 approaches the closing sensor 16, after the closing sensor senses the slag scraping plate 14, the closing sensor 16 feeds back a signal to the PLC controller, and the PLC controller will control the valve 8 to close and stop the continuous drainage.

[0061] As an embodiment of the present application, a scum baffle 17 is fixedly installed in the secondary sedimentation tank 1 in this embodiment. The scum baffle 17 is annular and is located in the upper part of the secondary sedimentation tank 1. A plurality of connecting rods 18 are fixedly installed between the scum single plate and the water outlet weir 22 of the secondary sedimentation tank 1. The plurality of connecting rods 18 are evenly distributed circumferentially. The setting of the scum baffle 17 can reduce the adhesion of scum to the inner wall of the water outlet weir 22 of the secondary sedimentation tank 1. When installing the scum trough 2, one end of the support frame 3 fixedly connected to the scum trough 2 is located below the scum baffle 17 and passes through the scum baffle 17 to be fixedly connected to the lifting frame 7 on the frame 40.

[0062] As an embodiment of the present application, a bridge 19 is fixedly installed on one side of the platform 13. Through the setting of the bridge 19, it is convenient for personnel to work on the bridge 19 and for personnel to walk to the platform 13 through the bridge 19 to repair the machine.

[0063] In this embodiment, a water spray pipe 20 is installed on one side of the bridge 19. The water spray pipe 20 extends along the radial direction of the secondary sedimentation tank 1. A plurality of nozzles 21 are installed at intervals along the axial direction of the water spray pipe 20. In this embodiment, the water spray pipe 20 is a 40mm stainless steel flushing pipe. One nozzle 21 is provided every 1.8m for this pipe, and the flushing pressure of the nozzles 21 increases from small to large. The nozzles 21 in this embodiment are composed of a ball valve, a universal joint and a nozzle. The nozzle is communicated with the water spray pipe 20 through a pipe, and a ball valve is installed on the pipe connecting each nozzle. The nozzle is connected to the pipe through a universal joint. In this embodiment, the nozzle can select an existing universal fan-shaped nozzle, so that the spraying angle and the water flow coverage area of the nozzle can be adjusted according to actual needs, so that each nozzle 21 can obtain a better effect of pushing the scum; in addition, by adjusting the opening degree of the ball valve, the water flow spraying intensity of each nozzle 21 can be adjusted, so as to more accurately realize the function of pushing the scum to the scum trough. The included angle between the water spray pipe 20 and the scum trough 2 is less than 90 degrees. The water spraying of the plurality of nozzles 21 can cover a larger surface of the secondary sedimentation tank 1, and can increase the amount of scum intercepted and pushed to the scum trough 2, thereby further improving the removal effect of the scum.

[0064] In this embodiment, when the slag scraping plate 14 in the secondary sedimentation tank rotates to gather slag, in cooperation with the stainless steel flushing pipe on the bridge 19 in the secondary sedimentation tank, a water wall is formed by spraying fan-shaped water to block the scum from reaching the scum trough 2 and no longer moving forward, so that the scum always gathers at the scum trough, which is convenient for flowing into the scum trough 2 for collection and treatment.

[0065] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A scum discharge device for a secondary sedimentation tank, comprising a frame, a support frame, a scum trough and a scum discharge pipe, one end of the scum discharge pipe is connected to the bottom of the scum trough, the scum trough is fixedly connected to the support frame, and the frame is fixedly installed on the inner side of the outlet weir of the secondary sedimentation tank, characterized in that: The support frame is connected to the frame, the slag inlet at the top of the slag trough is lower than the water surface of the secondary sedimentation tank, and a valve is installed on the slag discharge pipe.

2. A secondary sedimentation tank scum discharge device according to claim 1, characterized in that: One end of the support frame is connected to a lifting frame, the lifting frame is vertically slidably matched with the frame, and a driving unit for driving the lifting frame to move up and down is provided on the frame.

3. A secondary sedimentation tank scum discharge device according to claim 2, characterized in that: The frame comprises two slide rails and a top plate, two ends of the top plate are respectively connected to the two slide rails, and the lifting frame is vertically slidably matched with the two slide rails.

4. A secondary sedimentation tank scum discharge device according to claim 3, characterized in that: The two slide rails are provided with guide members along their vertical direction, and both ends of the lifting frame are connected with sliding members, and the sliding members at both ends of the lifting frame are respectively slidably matched vertically along the guide members on the two slide rails.

5. The scum discharge device for a secondary sedimentation tank according to claim 4, characterized in that: The guide member is a guide groove provided on the slide rail or a guide strip fixed on the slide rail.

6. A secondary sedimentation tank scum discharge device according to any one of claims 2 to 5, characterized in that: The driving unit includes a first screw rod, the first screw rod passes through the frame and the lifting frame in sequence, and the first screw rod is threadedly connected to the lifting frame.

7. A secondary sedimentation tank scum discharge device according to claim 6, characterized in that: The top of the frame is vertically connected with a second screw rod, the second screw rod is threadedly connected to the top of the frame, and the bottom end of the second screw rod can be against the lifting frame.

8. A secondary sedimentation tank scum discharge device according to any one of claims 2 to 5, characterized in that: The slag discharge pipe includes a straight pipe section and a bellows pipe section, one end of the bellows pipe section is connected to the bottom of the slag trough, the other end of the bellows pipe section is connected to the straight pipe section, and the valve is installed on the straight pipe section.

9. A secondary sedimentation tank scum cleaning system, characterized in that: It comprises a scraper plate, a central support and a secondary sedimentation tank scum discharge device as described in any one of claims 1 to 8, wherein the central support is located in the center of the secondary sedimentation tank, a platform is connected to the top of the central support, and the scraper plate is circumferentially rotatably connected to the central support.

10. A secondary sedimentation tank scum cleaning system according to claim 9, characterized in that: It also includes a sensor and a controller, the valve is an electric valve, the sensor and the valve are electrically connected to the controller, the sensor is installed on the platform, the sensor is located above the scraper plate, the radial extension line of the sensor is close to the scum groove, when the scraper plate moves to the bottom of the sensor and is recognized by the sensor, the sensor sends a signal to the controller, and the controller controls the valve to open.

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