A sludge thickening tank for wastewater treatment plant construction

Abstract

This invention discloses a sludge thickening tank for wastewater treatment plant construction, belonging to the field of sludge thickening technology. It includes a thickening tank with a conical sludge hopper at the bottom and a sludge discharge port at the bottom of the hopper. A sludge discharge pipe is located at the lower end of the discharge port. An overflow weir is slidably connected to the inner curved surface of the thickening tank, and a clear water tank is fixedly connected to the lower end of the outer curved surface. A fixed plate is radially fixedly connected to the upper end of the clear water tank, and a stirring assembly is fixedly connected to the middle of the fixed plate. A fixed chamber is fixedly connected to the upper end of the stirring assembly, and a second drive motor is fixedly connected to the upper end of the fixed chamber. An intermediate shaft and a retraction rod are slidably connected to the fixed chamber. This invention achieves advantages such as high-efficiency thickening, intelligent control, and wear resistance through an innovative structure of adjustable overflow weir + intelligent valve + dual-drive stirring, while also considering ease of operation and safe maintenance, making it suitable for modern wastewater treatment needs.

Description

Technical Field

[0001] This invention belongs to the field of sludge thickening technology, specifically relating to a sludge thickening tank used in the construction of wastewater treatment plants. Background Technology

[0002] A sludge thickening tank is a structure used for sludge thickening. It is generally of vertical flow or radial flow type. It can be divided into two types: intermittent operation and continuous operation. The former is mainly used in small wastewater treatment plants or industrial wastewater treatment plants, while the latter is used in large and medium-sized wastewater treatment plants. Sludge thickening tanks play an important role in the construction of wastewater treatment plants.

[0003] Traditional sludge thickening tanks generally suffer from problems such as low thickening efficiency, poor sludge discharge, and poor overflow effect. The fixed overflow weir in the existing technology cannot adapt to changes in sludge concentration, resulting in unstable supernatant quality; the stirring system is mostly based on a single rotation speed, making it difficult to meet the needs of mixing and flocculation; the sludge discharge system has insufficient reliability and is prone to clogging; and the overall structure has poor wear resistance and high maintenance costs.

[0004] To address these issues, this utility model proposes a novel sludge thickening tank structure. Through innovative designs such as an adjustable overflow weir, a dual-drive stirring system, and a three-stage sludge discharge valve, it achieves the technical effects of improved thickening efficiency, enhanced operational stability, and extended equipment life. Utility Model Content

[0005] The purpose of this invention is to provide a sludge thickening tank for wastewater treatment plant construction, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this invention provides the following technical solution: a sludge thickening tank for wastewater treatment plant construction, comprising a cylindrical thickening tank, a conical sludge hopper at the bottom of the thickening tank, a sludge discharge port at the bottom of the hopper, a sludge discharge pipe at the lower end of the discharge port, an overflow weir slidingly connected to the inner curved surface of the thickening tank, several limiting grooves at the upper end of the thickening tank, a clear water tank fixedly connected to the lower end of the outer curved surface of the thickening tank, a fixing plate radially fixedly connected to the upper end of the clear water tank, and a fixing plate fixedly connected to the middle of the fixing plate. A fixed chamber is fixedly connected to the lower end of the first drive motor of the stirring assembly and the upper end of the first drive motor of the stirring assembly. A second drive motor is fixedly connected to the upper end of the fixed chamber. An intermediate shaft and a shrinking rod are slidably connected to the upper and lower ends of both sides of the fixed chamber. The intermediate shaft and the shrinking rod are connected by a connecting belt in the middle. A connecting rope is connected to the outer surface of both ends of the shrinking rod. One end of the intermediate shaft is connected to the outer surface of one end of the second output shaft of the second drive motor by a connecting belt. A guide tube is fixedly connected to both sides of the lower middle part of the fixed plate.

[0007] It should be noted in the plan that the sludge discharge pipe is equipped with a parallel three-stage valve control system, which includes an electric regulating valve, a pneumatic quick-opening valve and a manual maintenance valve, and the valves are connected to each other through flanges.

[0008] It is worth noting that the overflow weir includes a baffle, the lower end of the inner curved surface of the baffle is set with a rounded corner structure, and the upper end of the baffle is fixedly connected to the inner side of the lower end of the extension plate. The upper end of the extension plate is fixedly connected with several teeth, the height of the teeth is -mm and the spacing is -mm. The outer side of the lower end of the extension plate is fixedly connected with several guide posts, and the outer surface of the guide posts is slidably connected to the inside of the limiting groove.

[0009] Furthermore, it should be noted that the lower end of the clear water tank is provided with a water outlet, and a water outlet pipe is fixedly connected to the lower end of the water outlet.

[0010] In a preferred embodiment, the fixing plate has an extension ring in the middle and rope grooves at both ends. The two ends of the rope grooves pass through the lower or upper end of the fixing plate, and guide bearings are slidably connected to both ends of the rope grooves. Railings are fixedly connected to both sides of the upper end of the fixing plate and the extension ring.

[0011] In a preferred embodiment, the stirring assembly includes a first drive motor, and several stirring paddles and several blades are fixedly connected to the upper and lower ends of the outer surface of the first output shaft of the first drive motor, respectively.

[0012] In a preferred embodiment, the inner surface of the guide tube is provided with a wear-resistant ceramic layer, and one side of the guide tube is connected to one end of the feed pipe.

[0013] In a preferred embodiment, the other end of each connecting rope is fixedly connected to one side of the extension plate of the overflow weir via two guide bearings on one side.

[0014] Compared with the prior art, the sludge thickening tank for wastewater treatment plant construction provided by this invention has at least the following beneficial effects:

[0015] (1) The overflow weir is slidably connected to the guide column and the limiting groove through the overflow weir. Combined with the connecting rope, the second drive motor of the drive system, and the contraction rod, the height can be adjusted flexibly according to the sludge concentration and flow rate, thereby improving the concentration effect. The sawtooth overflow weir (tooth height 50-80mm, spacing 100-150mm) optimizes the overflow uniformity, reduces scum accumulation, and lowers the maintenance frequency. The sludge discharge pipe adopts a three-stage parallel valve control system with electric regulating valve, pneumatic quick-opening valve, and manual maintenance valve, supporting automatic adjustment, rapid discharge, and emergency manual operation to ensure the stability of the sludge discharge process and avoid blockage or loss of control. The inner wall of the guide cylinder is equipped with a wear-resistant ceramic layer to reduce the scouring and wear of high-concentration sludge and lower maintenance costs. The conical sludge collection hopper and sludge discharge port optimize sludge collection efficiency and prevent sludge accumulation at the bottom. The fixed plate is equipped with a railing and rope groove guiding system, and the clear water tank is independently designed to avoid mixing of concentrated sludge and supernatant, thereby improving the effluent quality.

[0016] (2) The mixing components employ a layered design (mixing paddle + blades), combined with the linkage control of the first and second drive motors, to achieve low-speed mixing + high-speed shearing, preventing sludge settling and promoting flocculation. The guide tube works in conjunction with the feed pipe to optimize sludge distribution and avoid short-circuiting. The overflow weir is automatically raised and lowered via a motor drive (second drive motor) + connecting belt + retraction rod, linked to changes in sludge concentration to maintain the optimal liquid level. The electric regulating valve can be linked with a sludge concentration sensor (such as an ultrasonic sludge level gauge, not shown) to achieve intelligent sludge discharge control. The supernatant collected in the clear water tank is directly reused or discharged through the outlet pipe, reducing water waste. The wear-resistant ceramic layer and optimized structural design reduce energy consumption and extend equipment life. The adjustable overflow weir and layered mixing system are suitable for high-viscosity, easily settling, or scum-containing sludge, such as industrial wastewater and municipal sewage. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the front structure of this novel invention;

[0018] Figure 2 This is a schematic diagram of the overflow weir structure of this novel type;

[0019] Figure 3 This is a schematic diagram of the fixing plate structure of this novel invention.

[0020] In the diagram: 1. Thickening tank; 101. Sludge discharge port; 102. Limiting groove; 2. Clear water tank; 201. Water outlet; 202. Water outlet pipe; 3. Fixing plate; 301. Extension ring; 302. Rope groove; 303. Guide bearing; 4. Railing; 5. Agitator assembly; 501. First drive motor; 502. First output shaft; 503. Agitator; 504. Paddle; 6. Fixed chamber; 7. Second drive motor; 701. 8. Second output shaft; 9. Connecting belt; 10. Intermediate shaft; 11. Retraction rod; 12. Connecting rope; 13. Sludge discharge pipe; 14. Valve control system; 15. Electric regulating valve; 16. Pneumatic quick-opening valve; 17. Manual maintenance valve; 18. Overflow weir; 19. Baffle; 10. Extension plate; 10. Rounded corner structure; 11. Gear; 12. Guide post; 13. Feed pipe; 14. Flow guide cylinder. Detailed Implementation

[0021] The present invention will be further described below with reference to embodiments.

[0022] Please see Figure 1-3 This invention provides a sludge thickening tank for wastewater treatment plant construction, comprising: a thickening tank 1, the thickening tank 1 being cylindrical, a conical sludge hopper at the bottom of the thickening tank 1, a sludge discharge port 101 at the bottom end of the sludge hopper, a sludge discharge pipe 12 at the lower end of the sludge discharge port 101, an overflow weir 14 slidably connected to the inner curved surface of the thickening tank 1, a plurality of limiting grooves 102 at the upper end of the thickening tank 1, a clear water tank 2 fixedly connected to the lower end of the outer curved surface of the thickening tank 1, a fixing plate 3 radially fixedly connected to the upper end of the clear water tank 2, and a first drive motor of a stirring assembly 5 fixedly connected to the middle of the fixing plate 3. At the lower end of the machine 501, and at the upper end of the first drive motor 501 of the stirring assembly 5, a fixed chamber 6 is fixedly connected. At the upper end of the fixed chamber 6, a second drive motor 7 is fixedly connected. At the upper and lower ends of both sides of the fixed chamber 6, an intermediate shaft 9 and a shrinking rod 10 are slidably connected. The middle part of the intermediate shaft 9 and the shrinking rod 10 are engaged and connected by a connecting belt 8. The outer surfaces of both ends of the shrinking rod 10 are connected by a connecting rope 11. One end of the intermediate shaft 9 is engaged and connected to the outer surface of one end of the second output shaft 701 of the second drive motor 7 by the connecting belt 8. At the lower middle part of the fixed plate 3, guide tubes 16 are fixedly connected to both sides.

[0023] Further as Figure 1As shown, it is worth noting that the sludge discharge pipe 12 is equipped with a parallel three-stage valve control system 13. The valve control system 13 includes an electric regulating valve 1301, a pneumatic quick-opening valve 1302, and a manual maintenance valve 1303. The valves are connected by flanges. The electric regulating valve 1301 achieves precise flow control to ensure stable sludge concentration. The pneumatic quick-opening valve 1302 ensures rapid discharge in emergencies. The manual maintenance valve 1303 provides a safety guarantee for system maintenance. The parallel arrangement of the three valves improves the reliability of the system, and the failure of a single valve does not affect the overall operation.

[0024] Further as Figure 2 As shown, it is worth noting that the overflow weir 14 includes a baffle 1401. The lower end of the inner curved surface of the baffle 1401 is set with a rounded corner structure 1403, and the upper end of the baffle 1401 is fixedly connected to the inner side of the lower end of the extension plate 1402. Several teeth 1404 are fixedly connected to the upper end of the extension plate 1402. The height of the teeth 1404 is 50-80mm and the spacing is 100-150mm. Several guide posts 1405 are fixedly connected to the outer side of the lower end of the extension plate 1402. The outer surface of the guide posts 1405 is slidably connected to the inside of the limiting groove 102. The rounded corner structure 1403 reduces water flow turbulence and improves overflow stability. The sawtooth design makes the overflow more uniform and effectively intercepts scum. The sliding connection structure facilitates the adjustment of the weir plate height to adapt to different working conditions. The cooperation between the guide posts and the limiting groove ensures the stability of the adjustment process.

[0025] Further as Figure 1 As shown, it is worth noting that the lower end of the clear water tank 2 is provided with a water outlet 201, and the lower end of the water outlet 201 is fixedly connected to a water outlet pipe 202. The independent clear water tank 2 design achieves effective separation of mud and water, optimizes the position of the water outlet to ensure the quality of the supernatant, and the water outlet pipe facilitates the transportation of treated water to the next process. The structure is simple and maintenance is convenient.

[0026] This solution involves the following working process: Sludge enters the guide cylinder 16 through the feed pipe 15 and is evenly distributed in the thickening tank 1 after being guided by the wear-resistant ceramic layer. The first drive motor 501 drives the stirring paddle 503 and blade 504 to rotate, achieving uniform mixing and slow agitation of the sludge and promoting the settling of solid particles. The second drive motor 7 drives the intermediate shaft 9 and the contraction rod 10 through the connecting belt 8, which in turn drives the connecting rope 11 to adjust the height of the overflow weir 14, allowing the supernatant to overflow smoothly through the sawtooth overflow weir 14 to the clear water tank 2, and finally be discharged through the outlet pipe 202. The thickened sludge settles into the conical sludge collection hopper, and the discharge through the sludge discharge pipe 12 is controlled by the three-stage valve control system 13. Among them, the electric regulating valve 1301 achieves precise control, the pneumatic quick-opening valve 1302 is used for rapid sludge discharge, and the manual maintenance valve 1303 ensures maintenance safety. Throughout the process, the guide bearing 303 ensures the smooth adjustment of the overflow weir 14, and the railing 4 provides operational safety. This design achieves integrated operation of efficient sludge thickening, stable overflow, and reliable sludge discharge.

[0027] As can be seen from the above working process: precise flow control is achieved through the electric regulating valve 1301 to ensure stable sludge concentration; the pneumatic quick-opening valve 1302 ensures rapid discharge in emergencies; the manual maintenance valve 1303 provides safety assurance for system maintenance; the parallel setting of the three valves improves system reliability; a single valve failure does not affect the overall operation; the rounded corner structure 1403 reduces water flow turbulence and improves overflow stability; the serrated design makes the overflow more uniform and effectively intercepts scum; the sliding connection structure facilitates the adjustment of the weir plate height to adapt to different working conditions; the cooperation between the guide column and the limiting groove ensures the stability of the adjustment process; the independent clear water tank 2 design achieves effective separation of mud and water; the optimized outlet position ensures the quality of the supernatant; the outlet pipe facilitates the transportation of treated water to the next process; the structure is simple and maintenance is convenient.

[0028] Further as Figure 3 As shown, it is worth noting that the fixed plate 3 has an extension ring 301 in the middle, and both ends of the fixed plate 3 have rope grooves 302. The two ends of the rope grooves 302 pass through the lower or upper end of the fixed plate 3, and both ends of the rope grooves 302 are slidably connected to guide bearings 303. The fixed plate 3 and the upper sides of the extension ring 301 are fixedly connected to railings 4. The extension ring enhances the structural strength and improves stability. The rope grooves and guide bearings ensure smooth movement of the connecting rope 11. The railings provide safety protection and facilitate operation and maintenance. The overall structural design is reasonable and the space utilization rate is high.

[0029] Further as Figure 1As shown, it is worth noting that the stirring assembly 5 includes a first drive motor 501. Several stirring paddles 503 and several blades 504 are fixedly connected to the upper and lower ends of the outer surface of the first output shaft 502 of the first drive motor 501, respectively. Different stirring intensities are achieved through the upper and lower layered stirring design. The upper stirring paddle mainly plays a mixing role, while the lower blades enhance the fluidity of the sludge. The structure is compact and the stirring efficiency is high.

[0030] Further as Figure 1 As shown, it is worth noting that the inner surface of the guide tube 16 is provided with a wear-resistant ceramic layer, and one side of the guide tube 16 is connected to one end of the feed pipe 15. The wear-resistant ceramic layer significantly extends the service life, optimizes the feed flow direction, avoids short flow, reduces the scouring and wear of sludge on the tube wall, and has a simple structure and low maintenance cost.

[0031] Further as Figure 1 As shown, it is worth noting that the other end of each connecting rope 11 is fixedly connected to one side of the extension plate 1402 of the overflow weir 14 via two guide bearings 303 on one side. This achieves smooth lifting and lowering adjustment of the overflow weir, reduces frictional resistance of the guide bearings, ensures reliable connection, prevents damage, provides high adjustment accuracy, and facilitates operation.

[0032] In summary: Sludge enters the guide tube 16 through the feed pipe 15 and is evenly distributed in the thickening tank 1 after being guided by the wear-resistant ceramic layer. The first drive motor 501 drives the stirring paddle 503 and blade 504 to rotate, achieving uniform mixing and slow agitation of the sludge and promoting the settling of solid particles. The second drive motor 7 drives the intermediate shaft 9 and the shrinking rod 10 through the connecting belt 8, which in turn drives the connecting rope 11 to adjust the height of the overflow weir 14, allowing the supernatant to overflow smoothly through the sawtooth overflow weir 14 to the clear water tank 2, and finally be discharged through the outlet pipe 202. The thickened sludge settles into the conical sludge collection hopper, and the discharge through the sludge discharge pipe 12 is controlled by the three-stage valve control system 13. The electric regulating valve 1301 achieves precise control, the pneumatic quick-opening valve 1302 is used for rapid sludge discharge, and the manual maintenance valve 1303 ensures maintenance safety. Throughout the process, the guide bearing 303 ensures the smooth adjustment of the overflow weir 14, and the railing 4 provides operational safety. This design achieves integrated operation of efficient sludge thickening, stable overflow, and reliable sludge discharge. The extended ring enhances structural strength and stability, while rope grooves and guide bearings ensure smooth movement of the connecting rope 11. The railings provide safety protection and facilitate operation and maintenance. The overall structure is rationally designed with high space utilization. Different mixing intensities are achieved through a layered mixing design; the upper mixing blade primarily serves a mixing function, while the lower blades enhance sludge fluidity. The design is compact, with high mixing efficiency. The wear-resistant ceramic layer significantly extends service life, optimizes the feed flow direction, avoids short-circuiting, and reduces sludge erosion and wear on the cylinder wall. The structure is simple, with low maintenance costs. The overflow weir is smoothly raised and lowered, and the guide bearings reduce frictional resistance, ensuring reliable connection, durability, high adjustment precision, and convenient operation.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this invention. Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A sludge thickening tank for wastewater treatment plant construction, comprising a thickening tank (1), characterized in that: The thickening tank (1) is cylindrical, with a conical sludge hopper at the bottom and a sludge discharge port (101) at the bottom. A sludge discharge pipe (12) is located at the lower end of the sludge discharge port (101). An overflow weir (14) is slidably connected to the inner curved surface of the thickening tank (1). Several limiting grooves (102) are located at the upper end of the thickening tank (1). A clear water tank (2) is fixedly connected to the lower end of the outer curved surface of the thickening tank (1). A fixing plate (3) is radially fixedly connected to the upper end of the clear water tank (2). The middle part of the fixing plate (3) is fixedly connected to the lower end of the first drive motor (501) of the stirring assembly (5). A fixed chamber (6) is fixedly connected to the upper end of the first drive motor (501). A second drive motor (7) is fixedly connected to the upper end of the fixed chamber (6). An intermediate shaft (9) and a retractable rod (10) are slidably connected to the upper and lower ends of both sides of the fixed chamber (6). The middle part of the intermediate shaft (9) and the retractable rod (10) are connected by a connecting belt (8). A connecting rope (11) is connected to the outer surface of both ends of the retractable rod (10). One end of the intermediate shaft (9) is connected to the outer surface of one end of the second output shaft (701) of the second drive motor (7) by the connecting belt (8). A guide tube (16) is fixedly connected to both sides of the lower middle part of the fixed plate (3).

2. A sludge thickening tank for wastewater treatment plant construction according to claim 1, characterized in that: The sludge discharge pipe (12) is equipped with a parallel three-stage valve control system (13), which includes an electric regulating valve (1301), a pneumatic quick-opening valve (1302) and a manual maintenance valve (1303), and the valves are connected by flanges.

3. A sludge thickening tank for wastewater treatment plant construction according to claim 1, characterized in that: The overflow weir (14) includes a baffle (1401), the lower end of the inner curved surface of the baffle (1401) is set as a rounded corner structure (1403), and the upper end of the baffle (1401) is fixedly connected to the inner side of the lower end of the extension plate (1402). The upper end of the extension plate (1402) is fixedly connected with a number of teeth (1404), the height of the teeth (1404) is 50-80mm, the spacing is 100-150mm, and the outer side of the lower end of the extension plate (1402) is fixedly connected with a number of guide posts (1405). The outer surface of the guide posts (1405) is slidably connected to the inside of the limiting groove (102).

4. A sludge thickening tank for wastewater treatment plant construction according to claim 1, characterized in that: The lower end of the clear water tank (2) is provided with a water outlet (201), and a water outlet pipe (202) is fixedly connected to the lower end of the water outlet (201).

5. A sludge thickening tank for wastewater treatment plant construction according to claim 1, characterized in that: The fixed plate (3) has an extension ring (301) in the middle, and both ends of the fixed plate (3) have rope grooves (302). The two ends of the rope grooves (302) pass through the lower end or the upper end of the fixed plate (3), and both ends of the rope grooves (302) are slidably connected to guide bearings (303). The upper ends of the fixed plate (3) and the extension ring (301) are fixedly connected to railings (4).

6. A sludge thickening tank for wastewater treatment plant construction according to claim 1, characterized in that: The stirring assembly (5) includes a first drive motor (501), and several stirring paddles (503) and several blades (504) are fixedly connected to the upper and lower ends of the outer surface of the first output shaft (502) of the first drive motor (501).

7. A sludge thickening tank for wastewater treatment plant construction according to claim 1, characterized in that: The inner surface of the guide tube (16) is provided with a wear-resistant ceramic layer, and one side of the guide tube (16) is connected to one end of the feed pipe (15).

8. A sludge thickening tank for wastewater treatment plant construction according to claim 1, characterized in that: The other end of each connecting rope (11) passes through two guide bearings (303) on one side and is fixedly connected to one side of the extension plate (1402) of the overflow weir (14).

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