Dosing device for sewage treatment

Abstract

The invention provides a dosing device for sewage treatment, and relates to the field of sewage treatment.The dosing device comprises a mixing mechanism, a supporting plate is fixedly connected to the surface of the mixing mechanism, a sealing mechanism is arranged on the upper surface of the supporting plate, and a scattering mechanism is arranged on the inner side surface of the sealing mechanism; a moving mechanism is arranged on the surface of the inner side of the scattering mechanism, a buffering mechanism is arranged on the surface of the scattering mechanism, a supporting rod is fixedly connected to the lower surface of the supporting plate, and a water conveying mechanism is arranged on the upper edge of the supporting plate. Through arrangement of a connecting rod, a cleaning circular ring, a mixing mechanism and a scattering mechanism, multi-stage stirring and scattering of sewage and chemicals can be realized through the synergistic effect of the mixing mechanism and the scattering mechanism, sufficient mixing of the chemicals and the sewage is ensured, and the treatment effect is improved; a cleaning circular ring is driven to scrape and clean the inner wall of the stirring barrel, so that attached dirt is removed, and the stirring efficiency and the mixing effect are further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and specifically to a chemical dosing device for sewage treatment. Background Technique

[0002] Sewage treatment refers to the process of treating sewage through physical, chemical, and biological methods to meet specific water quality standards so that it can be discharged into a certain water body or reused. During the sewage treatment process, adding drugs to the sewage can effectively purify the sewage and make it meet the discharge standards.

[0003] The traditional sewage treatment chemical dosing method has been difficult to meet the increasing treatment requirements. There are some problems with the existing chemical dosing devices. For example, during the process of mixing the sewage and the chemical agent, there are still large lumps inside the sewage, which affect the mixing process. Moreover, the sewage is prone to sticking to the inner wall of the mixing barrel, reducing the efficiency of sewage treatment. The chemical agent is prone to coagulation after being placed for too long, which also reduces the sewage treatment efficiency. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a chemical dosing device for sewage treatment, which solves the problems of insufficient mixing degree of sewage and chemical agent and easy sticking to the inner wall of the mixing barrel.

[0006] (II) Technical Solutions

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A chemical dosing device for sewage treatment includes a mixing mechanism. The surface of the mixing mechanism is fixedly connected with a support plate. The upper surface of the support plate is provided with a closing mechanism. The inner surface of the closing mechanism is provided with a breaking-up mechanism. The inner surface of the breaking-up mechanism is provided with a moving mechanism. The surface of the breaking-up mechanism is provided with a buffering mechanism. The lower surface of the support plate is fixedly connected with a support rod. Above the support plate is provided with a water delivery mechanism. The surface of the support plate away from the water delivery mechanism is provided with a chemical agent delivery mechanism. The mixing mechanism includes a first protection box, a mixing box, a first motor, a beating plate, and a first connecting cylinder. The lower surface of the mixing box is fixedly connected with the first protection box. The first motor is fixedly connected to the inner surface of the first protection box. The driving end of the first motor is fixedly connected to the lower surface of the first connecting cylinder. The cylindrical surface of the first connecting cylinder is fixedly connected with the beating plate. By setting the beating plate, it is convenient to stir the chemical agent and sewage in the mixing box to prevent the chemical agent from caking.

[0008] Preferably, a discharge pipe is fixedly connected to the lower surface of the mixing box. A discharge cover is provided on the surface of the discharge pipe away from the mixing box. A medicine inlet is formed on the surface of the mixing box, and a support block is fixedly connected to the inner surface of the mixing box. The discharge cover is provided to conveniently control the opening and closing of the discharge pipe and prevent the leakage of the mixed liquid in the non-working state.

[0009] Preferably, the closing mechanism includes an electric push rod, a connecting block, and a fixing ring. The moving end of the electric push rod is fixedly connected to the connecting block, the surface of the connecting block is fixedly connected to the fixing ring, and the upper surface of the support plate is fixedly connected to the electric push rod. The electric push rod is provided to conveniently control the position of the fixing ring and realize the closing or opening of the mixing box.

[0010] Preferably, the dispersing mechanism includes a protective box, an upper cover plate, a stirring barrel, a second motor, a connecting ring, a connecting rod, a second connecting cylinder, and a slider. The lower surface of the protective box is fixedly connected to the upper cover plate, the second motor is fixedly connected to the inner surface of the protective box, and the lower surface of the upper cover plate is fixedly connected to the stirring barrel. The second motor is provided to conveniently drive the second connecting cylinder to rotate and provide power for the stirring and dispersing actions of the dispersing mechanism.

[0011] Preferably, the driving end of the second motor is fixedly connected to the surface of the second connecting cylinder, the slider is fixedly connected to the inner surface of the connecting ring, and the surface of the connecting ring away from the slider is fixedly connected to the connecting rod. The slider is provided to conveniently drive the connecting ring and the connecting rod to achieve complex movement trajectories and improve the dispersing and stirring effects.

[0012] Preferably, the water delivery mechanism includes a connecting water pipe, a sewage tank, a water delivery pump, and a water delivery pipe. The lower surface of the sewage tank is fixedly connected to the support plate. A connecting water pipe is fixedly connected to the lower surface of the sewage tank. One end of the connecting water pipe away from the sewage tank is fixedly connected to the water delivery pump, and a water delivery pipe is fixedly connected to the upper surface of the water delivery pump. The sewage tank is provided to conveniently provide a stable water source for the water delivery pump and ensure the continuous supply of sewage.

[0013] Preferably, the medicine delivery mechanism includes a medicine storage tank, a connecting medicine pipe, a medicine delivery pump, and a medicine delivery pipe. The lower surface of the medicine storage tank is fixedly connected to the support plate. The lower surface of the medicine storage tank is fixedly connected to the connecting medicine pipe. One end of the connecting medicine pipe away from the medicine storage tank is fixedly connected to the medicine delivery pump, and a medicine delivery pipe is fixedly connected to the surface of the medicine delivery pump away from the medicine storage tank. The medicine storage tank is provided to conveniently provide a medicine source for the medicine delivery pump and ensure the stable supply of medicine.

[0014] Preferably, the moving mechanism includes a cleaning ring, a third motor, a threaded rod, and a guiding cylinder. The driving end of the third motor is fixedly connected to the threaded rod. A circular through groove is formed on the upper surface of the cleaning ring. There are two circular through grooves. The surface of one of the circular through grooves is slidably connected to the guiding cylinder, and the surface of the other circular through groove is threadedly connected to the threaded rod. The cleaning ring is provided to facilitate rotation and movement along with the connecting rod, scrape and clean the inner wall of the stirring barrel, and remove the attached dirt.

[0015] Preferably, the buffering mechanism includes a connecting ring, a fixed cylinder, a fixed block, a lower cover plate, and a spring. The lower surface of the fixed cylinder is fixedly connected to the fixed block. A guiding through groove is formed on the upper surface of the connecting ring. The surface of the guiding through groove is slidably connected to the fixed cylinder. The upper surface of the connecting ring is fixedly connected to the spring, and the spring is wound around the cylindrical surface of the fixed cylinder. The spring is provided to facilitate using the elastic characteristic of the spring to provide a buffering force for the buffering mechanism, reduce the vibration and impact during the operation of the equipment, and protect the internal components.

[0016] Preferably, a water inlet is formed on the upper surface of the upper cover plate. The water delivery pipe communicates with the inside of the stirring barrel through the water inlet. The medicine delivery pipe communicates with the inside of the mixing tank through the medicine inlet. The inner surface of the connecting ring is fixedly connected to the stirring barrel. The inner surface of the fixed ring is fixedly connected to the stirring barrel. A sliding groove is formed on the cylindrical surface of the second connecting cylinder. The sliding block is slidably connected to the sliding groove surface of the second connecting cylinder. The fixed ring is provided to facilitate closing or opening the opening of the mixing tank, forming a seal when fitting with the surface of the mixing tank, and preventing gas leakage and external impurities from entering during the mixing process.

[0017] Working principle: When using the device, start the water pump and the chemical pump simultaneously. The water pump transports the sewage inside the sewage tank to the inside of the mixing barrel through the connecting water pipe, the water delivery pipe, and the water inlet on the surface of the upper cover plate. The chemical pump transports the chemical inside the chemical storage tank to the inside of the mixing tank through the connecting chemical pipe, the chemical delivery pipe, and the chemical inlet on the surface of the mixing tank. At the same time, start the second motor and the first motor. The second motor drives the second connecting cylinder to rotate, driving the slider to rotate, causing the connecting ring and the connecting rod to rotate with the slider, and the cleaning ring to rotate with the connecting rod. Start the third motor to drive the threaded rod to rotate, causing the cleaning ring to move under the guiding cooperation of the guiding cylinder. The cleaning ring scrapes and cleans the inner wall of the mixing barrel, effectively cleaning the inner wall. The connecting rod moves with the cleaning ring, causing the slider to slide on the surface of the chute of the second connecting cylinder, and the connecting rod breaks up the large structures in the sewage inside the mixing barrel. The first motor drives the first connecting cylinder to rotate, driving the beating plate to rotate, causing the beating plate to drive the chemical inside the mixing tank to rotate to prevent the chemical from caking. After the sewage inside the mixing barrel is broken up to a certain extent, the electric push rod moves to drive the connecting block, causing the fixed ring to move. The fixed ring moves until its surface fits with the surface of the mixing tank, and the fixed ring pushes the fixed cylinder to drive the fixed block to move, causing the lower cover plate to move to cancel the sealing of the lower part of the mixing barrel. The broken-up sewage inside the mixing barrel flows into the mixing tank and is fully mixed with the chemical under the stirring of the beating plate, effectively achieving the effect of full mixing.

[0018] (III) Beneficial effects

[0019] The present invention provides a chemical dosing device for sewage treatment. It has the following beneficial effects:

[0020] 1. By setting the mixing mechanism and the breaking-up mechanism, through the synergistic effect of the mixing mechanism and the breaking-up mechanism, multi-stage stirring and breaking-up of sewage and chemicals can be achieved. The first motor drives the beating plate to initially stir the chemical in the mixing tank to prevent the chemical from caking, and the second motor drives the connecting rod to further break up and refine the sewage in the mixing barrel to ensure full mixing of the chemical and the sewage, improving the treatment effect.

[0021] 2. By setting the connecting rod and the cleaning ring, the connecting rod can not only participate in the breaking-up of sewage but also drive the cleaning ring to scrape and clean the inner wall of the mixing barrel, removing the attached dirt, keeping the inner wall of the mixing barrel clean, and further improving the stirring efficiency and mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the overall structural schematic diagram of a chemical dosing device for sewage treatment proposed by the present invention;

[0023] Figure 2 is the schematic diagram of the mechanism on the surface of the support plate of a chemical dosing device for sewage treatment proposed by the present invention;

[0024] Figure 3 Schematic diagram of the dispersing mechanism of a chemical dosing device for sewage treatment proposed by the present invention;

[0025] Figure 4 Schematic diagram of the internal structure of the mixing barrel of a chemical dosing device for sewage treatment proposed by the present invention;

[0026] Figure 5 Of the chemical dosing device for sewage treatment proposed by the present invention Figure 4 Enlarged structure schematic diagram of A in;

[0027] Figure 6 Schematic diagram of the moving mechanism and buffer mechanism of a chemical dosing device for sewage treatment proposed by the present invention;

[0028] Figure 7 Schematic diagram of the structure of the second connecting cylinder and the cleaning ring of a chemical dosing device for sewage treatment proposed by the present invention;

[0029] Figure 8 Schematic diagram of the mixing mechanism of a chemical dosing device for sewage treatment proposed by the present invention.

[0030] Among them, 1. Mixing mechanism; 101. First protection box; 102. Mixing box; 103. First motor; 104. Beating plate; 105. First connecting cylinder; 2. Discharge cover; 3. Support rod; 4. Water delivery mechanism; 401. Connecting water pipe; 402. Sewage tank; 403. Water delivery pump; 404. Water delivery pipe; 5. Dispersing mechanism; 501. Protection box; 502. Upper cover plate; 503. Mixing barrel; 504. Second motor; 505. Connecting ring; 506. Connecting rod; 507. Second connecting cylinder; 508. Slide block; 6. Sealing mechanism; 601. Electric push rod; 602. Connecting block; 603. Fixed ring; 7. Chemical dosing mechanism; 701. Medicine storage tank; 702. Connecting medicine pipe; 703. Chemical dosing pump; 704. Chemical dosing pipe; 8. Support plate; 9. Discharge pipe; 10. Circular through groove; 11. Water inlet; 12. Medicine inlet; 13. Moving mechanism; 1301. Cleaning ring; 1302. Third motor; 1303. Threaded rod; 1304. Guide cylinder; 14. Buffer mechanism; 1401. Connecting ring; 1402. Fixed cylinder; 1403. Fixed block; 1404. Lower cover plate; 1405. Spring; 15. Guide through groove; 16. Support block. Detailed implementation manners

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment:

[0033] As Figure 1-8 shown, an embodiment of the present invention provides a chemical dosing device for sewage treatment, including a mixing mechanism 1. A support plate 8 is fixedly connected to the surface of the mixing mechanism 1. A sealing mechanism 6 is arranged on the upper surface of the support plate 8. A dispersing mechanism 5 is arranged on the inner surface of the sealing mechanism 6. A moving mechanism 13 is arranged on the inner surface of the dispersing mechanism 5. A buffer mechanism 14 is arranged on the surface of the dispersing mechanism 5. A support rod 3 is fixedly connected to the lower surface of the support plate 8. A water delivery mechanism 4 is arranged above the support plate 8. A chemical delivery mechanism 7 is arranged on the surface of the support plate 8 away from the water delivery mechanism 4. The mixing mechanism 1 includes a first protection box 101, a mixing box 102, a first motor 103, a beating plate 104 and a first connecting cylinder 105. The lower surface of the mixing box 102 is fixedly connected to the first protection box 101. The first motor 103 is fixedly connected to the inner surface of the first protection box 101. The driving end of the first motor 103 is fixedly connected to the lower surface of the first connecting cylinder 105. The cylindrical surface of the first connecting cylinder 105 is fixedly connected to the beating plate 104. The lower surface of the mixing box 102 is fixedly connected to a discharge pipe 9. A discharge cover 2 is arranged on the surface of the discharge pipe 9 away from the mixing box 102. A medicine inlet 12 is formed on the surface of the mixing box 102. A support block 16 is fixedly connected to the inner surface of the mixing box 102. The first motor 103 drives the first connecting cylinder 105 to rotate, driving the beating plate 104 to stir the chemicals and sewage in the mixing box 102. The stirring action of the beating plate 104 ensures that the chemicals are evenly dispersed in the sewage, prevents the chemicals from caking, and improves the mixing effect.

[0034] The driving end of the second motor 504 is fixedly connected to the surface of the second connecting cylinder 507. The slider 508 is fixedly connected to the inner surface of the connecting ring 505. The surface of the connecting ring 505 away from the slider 508 is fixedly connected to the connecting rod 506. The water delivery mechanism 4 includes a connecting water pipe 401, a sewage tank 402, a water pump 403 and a water delivery pipe 404. The lower surface of the sewage tank 402 is fixedly connected to the support plate 8. A connecting water pipe 401 is fixedly connected to the lower surface of the sewage tank 402. One end of the connecting water pipe 401 away from the sewage tank 402 is fixedly connected to the water pump 403. A water delivery pipe 404 is fixedly connected to the upper surface of the water pump 403. The sewage tank 402 stores sewage temporarily. The water pump 403 pumps sewage from the sewage tank 402 and conveys the sewage into the stirring barrel 503 through the connecting water pipe 401 and the water delivery pipe 404, providing a stable sewage flow for the subsequent mixing process.

[0035] The closing mechanism 6 includes an electric push rod 601, a connecting block 602 and a fixing ring 603. The moving end of the electric push rod 601 is fixedly connected to the connecting block 602. The surface of the connecting block 602 is fixedly connected to the fixing ring 603. The upper surface of the support plate 8 is fixedly connected to the electric push rod 601. The dispersing mechanism 5 includes a protective box 501, an upper cover plate 502, a stirring barrel 503, a second motor 504, a connecting ring 505, a connecting rod 506, a second connecting cylinder 507 and a slider 508. The lower surface of the protective box 501 is fixedly connected to the upper cover plate 502. The second motor 504 is fixedly connected to the inner surface of the protective box 501. The lower surface of the upper cover plate 502 is fixedly connected to the stirring barrel 503. The second motor 504 drives the second connecting cylinder 507 to rotate, driving the connecting ring 505 and the connecting rod 506 to rotate, and initially dispersing the sewage in the stirring barrel 503 to prevent large block structures from affecting the subsequent mixing effect.

[0036] The buffer mechanism 14 includes a connecting ring 1401, a fixed cylinder 1402, a fixed block 1403, a lower cover plate 1404 and a spring 1405. The lower surface of the fixed cylinder 1402 is fixedly connected to the fixed block 1403. A guiding through groove 15 is formed on the upper surface of the connecting ring 1401, and the surface of the guiding through groove 15 is slidably connected to the fixed cylinder 1402. The upper surface of the connecting ring 1401 is fixedly connected to the spring 1405. The spring 1405 surrounds the cylindrical surface of the fixed cylinder 1402. An inlet 11 is formed on the upper surface of the upper cover plate 502. The water delivery pipe 404 communicates with the inside of the mixing barrel 503 through the inlet 11. The medicine delivery pipe 704 communicates with the inside of the mixing box 102 through the medicine inlet 12. The inner surface of the connecting ring 1401 is fixedly connected to the mixing barrel 503. The inner surface of the fixed ring 603 is fixedly connected to the mixing barrel 503. A chute is formed on the cylindrical surface of the second connecting cylinder 507, and the chute surface of the second connecting cylinder 507 is slidably connected to the slider 508. When the fixed block 1403 pushes the lower cover plate 1404 to move, the elastic characteristic of the spring 1405 provides buffering for the whole movement, reduces the vibration and impact during the operation of the equipment, protects the internal components and prolongs the service life of the equipment.

[0037] The medicine delivery mechanism 7 includes a medicine storage tank 701, a connecting medicine pipe 702, a medicine delivery pump 703 and a medicine delivery pipe 704. The lower surface of the medicine storage tank 701 is fixedly connected to the support plate 8. The lower surface of the medicine storage tank 701 is fixedly connected to the connecting medicine pipe 702. One end of the connecting medicine pipe 702 far away from the medicine storage tank 701 is fixedly connected to the medicine delivery pump 703. The surface of the medicine delivery pump 703 far away from the medicine storage tank 701 is fixedly connected to the medicine delivery pipe 704. The moving mechanism 13 includes a cleaning ring 1301, a third motor 1302, a threaded rod 1303 and a guiding cylinder 1304. The driving end of the third motor 1302 is fixedly connected to the threaded rod 1303. Two circular through grooves 10 are formed on the upper surface of the cleaning ring 1301. The surface of one of the circular through grooves 10 is slidably connected to the guiding cylinder 1304, and the surface of the other circular through groove 10 is threadedly connected to the threaded rod 1303. The medicine storage tank 701 stores the medicine. The medicine delivery pump 703 extracts the medicine from the medicine storage tank 701 and transports the medicine to the inside of the mixing box 102 through the connecting medicine pipe 702 and the medicine delivery pipe 704 to ensure the accurate dosing of the medicine. The third motor 1302 drives the threaded rod 1303 to rotate. The threaded rod 1303 cooperates with the circular through groove 10 of the cleaning ring 1301, and under the guiding action of the guiding cylinder 1304, the cleaning ring 1301 moves along a predetermined track to realize the comprehensive cleaning of the inner wall of the mixing barrel 503.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A chemical dosing device for sewage treatment, comprising a mixing mechanism (1), characterized in that: A support plate (8) is fixedly connected to the surface of the mixing mechanism (1). A closing mechanism (6) is arranged on the upper surface of the support plate (8). A dispersing mechanism (5) is arranged on the inner surface of the closing mechanism (6). A moving mechanism (13) is arranged on the inner surface of the dispersing mechanism (5). A buffer mechanism (14) is arranged on the surface of the dispersing mechanism (5). A support rod (3) is fixedly connected to the lower surface of the support plate (8). A water delivery mechanism (4) is arranged above the support plate (8). A medicine delivery mechanism (7) is arranged on the surface of the support plate (8) away from the water delivery mechanism (4). The mixing mechanism (1) includes a first protection box (101), a mixing box (102), a first motor (103), a beating plate (104), and a first connecting cylinder (105). The lower surface of the mixing box (102) is fixedly connected to the first protection box (101). The first motor (103) is fixedly connected to the inner surface of the first protection box (101). The driving end of the first motor (103) is fixedly connected to the lower surface of the first connecting cylinder (105). The cylindrical surface of the first connecting cylinder (105) is fixedly connected to the beating plate (104).

2. The chemical dosing device for sewage treatment according to claim 1, characterized in that: An outlet pipe (9) is fixedly connected to the lower surface of the mixing box (102). An outlet cover (2) is arranged on the surface of the outlet pipe (9) away from the mixing box (102). A medicine inlet (12) is formed in the surface of the mixing box (102). A support block (16) is fixedly connected to the inner surface of the mixing box (102).

3. The chemical dosing device for sewage treatment according to claim 2, characterized in that: The closing mechanism (6) includes an electric push rod (601), a connecting block (602), and a fixing ring (603). The moving end of the electric push rod (601) is fixedly connected to the connecting block (602). The surface of the connecting block (602) is fixedly connected to the fixing ring (603). The upper surface of the support plate (8) is fixedly connected to the electric push rod (601).

4. The chemical dosing device for sewage treatment according to claim 3, characterized in that: The dispersing mechanism (5) includes a protection box (501), an upper cover plate (502), a stirring barrel (503), a second motor (504), a connecting ring (505), a connecting rod (506), a second connecting cylinder (507), and a slider (508). The lower surface of the protection box (501) is fixedly connected to the upper cover plate (502). The second motor (504) is fixedly connected to the inner surface of the protection box (501). The lower surface of the upper cover plate (502) is fixedly connected to the stirring barrel (503).

5. The chemical dosing device for sewage treatment according to claim 4, characterized in that: The driving end of the second motor (504) is fixedly connected to the surface of the second connecting cylinder (507). The slider (508) is fixedly connected to the inner surface of the connecting ring (505). The surface of the connecting ring (505) away from the slider (508) is fixedly connected to the connecting rod (506).

6. The chemical dosing device for sewage treatment according to claim 4, characterized in that: The water delivery mechanism (4) includes a connecting water pipe (401), a sewage tank (402), a water delivery pump (403) and a water delivery pipe (404). The lower surface of the sewage tank (402) is fixedly connected to the support plate (8). A connecting water pipe (401) is fixedly connected to the lower surface of the sewage tank (402). One end of the connecting water pipe (401) away from the sewage tank (402) is fixedly connected to the water delivery pump (403). A water delivery pipe (404) is fixedly connected to the upper surface of the water delivery pump (403).

7. The chemical dosing device for sewage treatment according to claim 6, characterized in that: The medicine delivery mechanism (7) includes a medicine storage tank (701), a connecting medicine pipe (702), a medicine delivery pump (703) and a medicine delivery pipe (704). The lower surface of the medicine storage tank (701) is fixedly connected to the support plate (8). The lower surface of the medicine storage tank (701) is fixedly connected to the connecting medicine pipe (702). One end of the connecting medicine pipe (702) away from the medicine storage tank (701) is fixedly connected to the medicine delivery pump (703). The surface of the medicine delivery pump (703) away from the medicine storage tank (701) is fixedly connected to the medicine delivery pipe (704).

8. The chemical dosing device for sewage treatment according to claim 1, wherein: The moving mechanism (13) includes a cleaning ring (1301), a third motor (1302), a threaded rod (1303) and a guiding cylinder (1304). The driving end of the third motor (1302) is fixedly connected to the threaded rod (1303). A circular ring through groove (10) is formed on the upper surface of the cleaning ring (1301). There are two circular ring through grooves (10). The surface of one of the circular ring through grooves (10) is slidably connected to the guiding cylinder (1304), and the surface of the other circular ring through groove (10) is threadedly connected to the threaded rod (1303).

9. The chemical dosing device for sewage treatment according to claim 7, characterized in that: The buffering mechanism (14) includes a connecting ring (1401), a fixed cylinder (1402), a fixed block (1403), a lower cover plate (1404) and a spring (1405). The lower surface of the fixed cylinder (1402) is fixedly connected to the fixed block (1403). A guiding through groove (15) is formed on the upper surface of the connecting ring (1401). The surface of the guiding through groove (15) is slidably connected to the fixed cylinder (1402). The upper surface of the connecting ring (1401) is fixedly connected to the spring (1405). The spring (1405) is wound around the cylindrical surface of the fixed cylinder (1402).

10. The chemical dosing device for sewage treatment according to claim 9, characterized in that: An inlet (11) is formed on the upper surface of the upper cover plate (502). The water delivery pipe (404) communicates with the inside of the mixing barrel (503) through the inlet (11). The medicine delivery pipe (704) communicates with the inside of the mixing tank (102) through the medicine inlet (12). The inner surface of the connecting ring (1401) is fixedly connected to the mixing barrel (503). The inner surface of the fixed ring (603) is fixedly connected to the mixing barrel (503). A chute is formed on the cylindrical surface of the second connecting cylinder (507). The surface of the chute of the second connecting cylinder (507) is slidably connected to the slider (508).

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