A flocculant dosing device for sewage treatment

Abstract

The present invention discloses a flocculant dosing device for sewage treatment. The present invention relates to the technical field of sewage treatment, and includes a housing, the housing is fixedly connected to a box body, a through hole is opened at the top of the housing, the housing communicates with the box body through the through hole, a filter plate is fixedly connected to the middle of the housing, a rotating rod is rotatably connected to the inner wall of the housing, the rotating rod is fixedly connected to the output end of a motor, and stirring rods are fixedly connected to the outer wall of the rotating rod. For this flocculant dosing device for sewage treatment, the flocculant is screened through a filter screen to prevent the agglomerated flocculant from directly entering the mixing tank, resulting in uneven mixing of the flocculant and the water inside the mixing tank and affecting the sewage treatment effect. By setting spiral plates, the non-standard agglomerated flocculant moves along with the spiral plates. Under the action of centrifugal force and the elastic force of the spring, the spherical balls vibrate inside the two spiral plates, thereby knocking on the agglomerated flocculant.

Description

Technical Field

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

[0002] Sewage treatment is to put sewage into the sewage treatment tank of a sewage treatment plant, and then treat the sewage through steps such as flocculation, sedimentation, ionization, magnetic separation, and filtration, so that the sewage meets the water quality requirements for discharging into a certain water body or being reused. Among them, flocculation refers to putting corresponding types of flocculants into the sewage treatment tank to treat suspended solids and harmful substances in the sewage, making them precipitate and aggregate into granular objects, and promoting their easy separation.

[0003] Existing flocculant dosing devices usually use dosing equipment to sprinkle flocculants on the surface of the sewage treatment tank. In order to accelerate the mixing of the flocculant and the sewage and make the flocs appear quickly, usually, after the flocculant is dosed, a stirring device needs to be used additionally for stirring, which wastes time. At the same time, due to the influence of the storage environment and time, the dry powder flocculant will agglomerate, resulting in poor sewage treatment effect. Summary of the Invention

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: A flocculant dosing device for sewage treatment includes a mixing tank, the mixing tank has a connected bottom plate, a control box is fixedly connected to the top of the mixing tank, and a lifting block is arranged in the middle of the top of the mixing tank. A water inlet pipe is fixedly connected to the top of the mixing tank, a motor is fixedly connected to the outside of the mixing tank, and a water outlet pipe is fixedly connected to the outside of the mixing tank. By setting the mixing tank, the dry powder flocculant is mixed with water, avoiding directly putting the powdered flocculant into the sewage treatment tank. By putting the solution into the sewage treatment tank, the flocculant spreads more widely, improving the evenness of the flocculant distribution in the sewage;

[0005] A screening box, the screening box is fixedly installed on the top of the mixing tank;

[0006] A dry powder bin, the dry powder bin is fixedly installed on the top of the lifting block on the mixing tank;

[0007] The water outlet pipe and the motor are arranged on adjacent outsides. The screening box, the dry powder bin, and the water inlet pipe are arranged in sequence on the central axis of the top of the mixing tank. The control box is arranged at the edge of the mixing tank. A transmission part is arranged on the side of the mixing tank away from the motor. The discharge pipe of the dry powder bin is fixedly connected to the outside of the box body;

[0008] Among them, the screening box includes a box body. A rotating shaft is rotatably connected inside the box body. The rotating shaft penetrates the box body and is connected to a transmission member. During operation, the flocculant inside the dry powder bin enters the inside of the filter screen through the discharge pipe. The motor is externally powered to work. Thus, the motor drives the rotating shaft to rotate through the transmission member, causing the rotating shaft to drive the spiral plate to rotate. The flocculant that meets the standard with a small volume passes through the filter screen. By setting the filter screen, the flocculant is screened to prevent the caked flocculant from directly entering the mixing box, resulting in a slow mixing speed and uneven mixing of the flocculant with the water inside the mixing box, affecting the sewage treatment effect. By setting the spiral plate, the non-standard caked flocculant moves along with the spiral plate. Under the action of centrifugal force and the elastic force of the spring, the ball vibrates inside the two spiral plates, thereby knocking on the caked flocculant. The inner wall of the box body is fixedly connected with a filter screen. The rotating shaft is located on the axis of the filter screen. The outer side of the rotating shaft is fixedly connected with a spiral plate. The outer wall of the spiral plate is fixedly connected with a spring. One end of the spring away from the spiral plate is fixedly connected with a ball. The springs are symmetrically arranged with the ball as the center. The number of the spiral plates is multiple, and the multiple spiral plates are evenly distributed with the rotating shaft as the center. One end of the spring away from the ball is fixedly connected to two adjacent spiral plates respectively.

[0009] Preferably, a support rod is fixedly connected to the middle of the outer side of the rotating shaft. The support rod is located between the two spiral plates. During operation, the rotating shaft drives the support rod to rotate, and the support rod drives the brush to rotate, so that the brush cleans the inner wall of the filter screen to prevent the filter screen from being blocked and reducing the working efficiency. One end of the support rod away from the rotating shaft is fixedly connected with a brush. A sealing mechanism is arranged on the inner wall of the box body. The sealing mechanism is located below the filter screen.

[0010] Preferably, the sealing mechanism includes a rotating rod. The rotating rod is rotatably connected to the box body. The rotating rods are symmetrically arranged inside the box body. The outer wall of the rotating rod is fixedly connected with a sealing plate. In the initial state, under the elastic force of the elastic plate, the two sealing plates are horizontal. The convex block is made of rubber. At this time, through the cooperation between the grooves and the convex blocks on the two sealing plates, the two sealing plates are just parallel to the inner cavity of the box body. By setting the sealing plate, the screened flocculant does not directly enter the mixing box, and at the same time, it avoids some water splashing onto the filter screen during the mixing and stirring inside the mixing box, resulting in the blockage of the outer wall of the filter screen and thus the need for maintenance, affecting the working efficiency. The number of the sealing plates is two. A groove is formed in the middle of the sealing plate close to the box body. A convex block is fixedly connected to one side of the sealing plate close to the groove. The convex blocks and the grooves on the two sealing plates are arranged in a staggered manner. The convex block is located inside the groove.

[0011] Preferably, one end of the sealing plate away from the filter screen is fixedly connected with an elastic plate. There are tooth grooves at one end of the sealing plate close to the box body. A rack is slidably connected to the inner wall of the box body. The rack is in gear engagement with the sealing plate through the tooth grooves. A connecting plate is fixedly connected to the bottom of the rack. One end of the elastic plate away from the sealing plate is fixedly connected with a connecting plate. The top of the connecting plate is fixedly connected with the elastic plate.

[0012] Preferably, the mixing box includes a housing. The housing is fixedly connected with the box body. A through hole is opened at the top of the housing. The housing communicates with the box body through the through hole. A filter plate is fixedly connected to the middle of the housing. A rotating rod is rotatably connected to the inner wall of the housing. The rotating rod is fixedly connected with the output end of the motor. Stirring rods are fixedly connected to the outer wall of the rotating rod. During operation, an aqueous solution is added through the water inlet pipe. At the same time, the motor is powered on to work. The motor drives the rotating rod to rotate. Thus, the rotating rod drives the stirring rods to rotate, accelerating the flow of water inside the mixing box, making the dry powder flocculant mix evenly with the water. A rotating plate is fixedly connected to the outer wall of the rotating rod. The number of the rotating plates is three. The three rotating plates are evenly distributed around the rotating rod. A sliding groove is opened on the outer wall of the rotating plate. A slider is slidably connected to the inner wall of the sliding groove. The top of the slider is arc-shaped. During operation, the motor drives the rotating rod to rotate. The rotating rod drives the rotating plate to rotate. Under the action of the elastic force of the elastic rope and the centrifugal force, the slider moves away from the rotating rod inside the sliding groove. At the same time, the slider will contact the top connecting plate as the rotating plate rotates. A force acts between the slider and the connecting plate, making the connecting plate drive the rack to move upward, and then driving the sealing plate to rotate around the rotating rod. The top flocculant falls into the mixing box. Due to different rotation speeds of the motor, the distance of the slider from the rotating rod in the sliding groove is different. Thus, the rotation angle of the sealing plate is different, making the amount of flocculant falling different. By setting the slider, the amount of flocculant falling into the mixing box can be adjusted according to the rotation speed of the motor, making the mixing more uniform. An elastic rope is fixedly connected to the outer wall of the slider. In the initial state, the elastic rope is in a taut state. Both ends of the elastic rope are fixedly connected with two adjacent sliders. A curved plate is fixedly connected to one end of the rotating plate close to the filter plate. When mixing and dissolving, there are some flocculants stacked into blocks. During operation, the motor drives the rotating rod to rotate. The rotating rod drives the rotating plate to rotate. The rotating plate drives the curved plate to rotate, making the roller roll on the filter plate and scraping the surface of the filter plate. By setting the filter plate, the lumped flocculants in the water are filtered, preventing the lumped flocculants from directly entering the sewage pool through the water outlet pipe, resulting in waste of the drug, prolonging the dissolution of the lumped flocculants and water, and effectively improving the utilization rate of the drug. A roller is rotatably connected to one end of the curved plate close to the filter plate.

[0013] The present invention provides a flocculant dosing device for sewage treatment. It has the following beneficial effects:

[0014] 1. The flocculant dosing device for sewage treatment screens the flocculant through a filter screen to prevent caked flocculant from directly entering the mixing tank, which may lead to a slow and uneven mixing rate of the flocculant with the water inside the mixing tank, thus affecting the sewage treatment effect. By setting the spiral plate, the non-standard caked flocculant moves along with the spiral plate. Under the action of centrifugal force and the elastic force of the spring, the ball vibrates inside the two spiral plates, thereby knocking on the caked flocculant.

[0015] 2. The flocculant dosing device for sewage treatment, through the cooperation between the grooves and protrusions on the two sealing plates, the two sealing plates are just parallel to the inner cavity of the box body. By setting the sealing plates, the screened flocculant does not directly enter the mixing tank, and at the same time, it prevents some water from splashing onto the filter screen during the mixing and stirring inside the mixing tank, resulting in blockage of the outer wall of the filter screen, thus requiring maintenance and affecting the work efficiency.

[0016] 3. The flocculant dosing device for sewage treatment, due to different rotation speeds of the motor, the distance of the slider from the rotating rod in the sliding groove is different, and thus the rotation angle of the sealing plate is different, resulting in different amounts of flocculant falling. By setting the slider, the amount of flocculant falling into the mixing tank can be adjusted according to the rotation speed of the motor, making the mixing more uniform.

[0017] 4. The flocculant dosing device for sewage treatment, when there is some flocculant stacked into blocks during mixing and dissolution, the rotating rod drives the rotating plate to rotate, and the rotating plate drives the curved plate to rotate, causing the roller to roll on the filter plate, scraping the surface of the filter plate. By setting the filter plate, the caked flocculant in the water is filtered, preventing the caked flocculant from directly entering the sewage tank through the outlet pipe, resulting in waste of the drug, prolonging the dissolution of the caked flocculant and water, and effectively improving the utilization rate of the drug. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the external structure of a flocculant dosing device for sewage treatment according to the present invention;

[0019] Figure 2 is a schematic side view structure diagram of the present invention;

[0020] Figure 3 is a schematic cross-sectional structure diagram of the present invention;

[0021] Figure 4 is a schematic partial cross-sectional structure diagram of the screening box of the present invention;

[0022] Figure 5 is a schematic cross-sectional structure diagram of the screening box of the present invention;

[0023] Figure 6 is a schematic partial structure diagram of the screening box of the present invention;

[0024] Figure 7 Structural schematic diagram of the sealing mechanism of the present invention;

[0025] Figure 8 For the present invention Figure 7 Enlarged view structure schematic diagram at position A in the present invention;

[0026] Figure 9 Cross-sectional view structure schematic diagram of the mixing tank of the present invention;

[0027] Figure 10 Partial structure schematic diagram of the mixing tank of the present invention.

[0028] In the figure: 1. Mixing tank; 11. Outer shell; 12. Filter plate; 13. Rotating rod; 14. Stirring rod; 15. Rotating plate; 16. Chute; 17. Slide block; 18. Elastic cord; 19. Curved plate; 110. Roller; 2. Screening box; 21. Box body; 22. Sealing mechanism; 221. Rotating rod; 222. Sealing plate; 223. Rack; 224. Elastic plate; 225. Connecting plate; 226. Groove; 227. Protrusion; 23. Rotating shaft; 24. Filter screen; 25. Spiral plate; 26. Spring; 27. Sphere; 28. Support rod; 29. Brush; 3. Control box; 4. Dry powder bin; 5. Water outlet pipe; 6. Motor; 7. Water inlet pipe. Specific embodiments

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are given for the purpose of illustration and description, and are not exhaustive or limited to the disclosed form. Many modifications and variations will be obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

[0030] The first embodiment, as Figures 1 to 6 shown, the present invention provides a technical solution: a flocculant dosing device for sewage treatment, including a mixing tank 1, the mixing tank 1 has a connected bottom plate, a control box 3 is fixedly connected to the top of the mixing tank 1, and a raised block is arranged in the middle of the top of the mixing tank 1, a water inlet pipe 7 is fixedly connected to the top of the mixing tank 1, a motor 6 is fixedly connected to the outside of the mixing tank 1, and a water outlet pipe 5 is fixedly connected to the outside of the mixing tank 1. By setting the mixing tank 1, the dry powder flocculant is mixed with water, avoiding directly putting the powdered flocculant into the sewage pool, and putting it into the sewage pool through the solution, so that the flocculant spreads wider and improves the evenness of the flocculant distribution in the sewage;

[0031] A screening box 2, the screening box 2 is fixedly installed on the top of the mixing tank 1;

[0032] The dry powder bin 4 is fixedly installed on the top of the elevation block on the mixing box 1;

[0033] The water outlet pipe 5 and the motor 6 are arranged on the adjacent outer sides. The screening box 2, the dry powder bin 4, and the water inlet pipe 7 are arranged in sequence on the central axis of the top of the mixing box 1. The control box 3 is arranged at the edge of the mixing box 1. A transmission member is arranged on the side of the mixing box 1 away from the motor 6. The discharge pipe of the dry powder bin 4 is fixedly connected to the outer side of the box body 21;

[0034] Among them, the screening box 2 includes a box body 21. A rotating shaft 23 is rotatably connected inside the box body 21. The rotating shaft 23 passes through the box body 21 and is connected to the transmission member. During operation, the flocculant inside the dry powder bin 4 enters the inside of the filter screen 24 through the discharge pipe. The motor 6 is externally powered to work. Thus, the motor 6 drives the rotating shaft 23 to rotate through the transmission member, causing the rotating shaft 23 to drive the spiral plate 25 to rotate. The flocculant that meets the standard with a small volume passes through the filter screen 24. By setting the filter screen 24, the flocculant is screened to prevent the caked flocculant from directly entering the inside of the mixing box 1, resulting in a slow mixing speed of the flocculant with the water inside the mixing box 1 and uneven mixing, which affects the sewage treatment effect. By setting the spiral plate 25, the non-standard caked flocculant moves along with the spiral plate 25. Under the action of centrifugal force and the elastic force of the spring 26, the spherical ball 27 vibrates inside the two spiral plates 25, thereby knocking on the caked flocculant. The inner wall of the box body 21 is fixedly connected with the filter screen 24. The rotating shaft 23 is located on the axis of the filter screen 24. The outer side of the rotating shaft 23 is fixedly connected with the spiral plate 25. The outer wall of the spiral plate 25 is fixedly connected with the spring 26. One end of the spring 26 away from the spiral plate 25 is fixedly connected with the spherical ball 27. The spring 26 is symmetrically arranged with the spherical ball 27 as the center. The number of spiral plates 25 is multiple, and the multiple spiral plates 25 are evenly distributed with the rotating shaft 23 as the center. One end of the spring 26 away from the spherical ball 27 is respectively fixedly connected with the adjacent two spiral plates 25.

[0035] A support rod 28 is fixedly connected to the middle of the outer side of the rotating shaft 23. The support rod 28 is located between the two spiral plates 25. During operation, the rotating shaft 23 drives the support rod 28 to rotate, and the support rod 28 drives the brush 29 to rotate, so that the brush 29 cleans the inner wall of the filter screen 24 to prevent the filter screen 24 from being blocked and reducing the working efficiency. One end of the support rod 28 away from the rotating shaft 23 is fixedly connected with the brush 29. A sealing mechanism 22 is arranged on the inner wall of the box body 21. The sealing mechanism 22 is located below the filter screen 24.

[0036] Second embodiment, on the basis of the first embodiment, please refer to Figures 7 to 8As shown, the sealing mechanism 22 includes a rotating rod 221, which is rotatably connected to the box body 21. The rotating rods 221 are symmetrically arranged inside the box body 21. A sealing plate 222 is fixedly connected to the outer wall of the rotating rod 221. In the initial state, under the elastic force of the elastic plate 224, the two sealing plates 222 are horizontal. The convex block 227 is made of rubber. At this time, through the cooperation between the groove 226 and the convex block 227 on the two sealing plates 222, the two sealing plates 222 are just parallel to the inner cavity of the box body 21. By setting the sealing plate 222, the screened flocculant does not directly enter the inside of the mixing box 1, and at the same time, it avoids some water splashing onto the filter screen 24 during the mixing and stirring inside the mixing box 1, resulting in the blockage of the outer wall of the filter screen 24, and thus the need for maintenance, which affects the work efficiency. The number of the sealing plates 222 is two. A groove 226 is formed in the middle of the sealing plate 222 close to the box body 21. A convex block 227 is fixedly connected to one side of the sealing plate 222 close to the groove 226. The convex blocks 227 and the grooves 226 on the two sealing plates 222 are arranged in a staggered manner, and the convex block 227 is located inside the groove 226.

[0037] One end of the sealing plate 222 away from the filter screen 24 is fixedly connected to an elastic plate 224. There is a tooth groove at one end of the sealing plate 222 close to the box body 21. A rack 223 is slidably connected to the inner wall of the box body 21. The rack 223 is in gear engagement with the sealing plate 222 through the tooth groove. A connecting plate 225 is fixedly connected to the bottom of the rack 223. One end of the elastic plate 224 away from the sealing plate 222 is fixedly connected to the connecting plate 225. The top of the connecting plate 225 is fixedly connected to the elastic plate 224.

[0038] For the third embodiment, on the basis of the first and second embodiments, please refer to Figures 9 to 10As shown in the figure, the mixing tank 1 includes a housing 11, the housing 11 is fixedly connected to the box body 21, a through hole is provided at the top of the housing 11, and the housing 11 communicates with the box body 21 through the through hole. A filter plate 12 is fixedly connected to the middle of the housing 11. A rotating rod 13 is rotatably connected to the inner wall of the housing 11. The rotating rod 13 is fixedly connected to the output end of the motor 6. Stirring rods 14 are fixedly connected to the outer wall of the rotating rod 13. During operation, an aqueous solution is added through the water inlet pipe 7. At the same time, the motor 6 is externally powered and operates. The motor 6 drives the rotating rod 13 to rotate, so that the rotating rod 13 drives the stirring rods 14 to rotate, accelerating the flow of water inside the mixing tank 1, making the powdery flocculant and water mix evenly. A rotating plate 15 is fixedly connected to the outer wall of the rotating rod 13. There are three rotating plates 15, and the three rotating plates 15 are evenly distributed around the rotating rod 13. A sliding groove 16 is provided on the outer wall of the rotating plate 15. A slider 17 is slidably connected to the inner wall of the sliding groove 16. The top of the slider 17 is arc-shaped. During operation, the motor 6 drives the rotating rod 13 to rotate, and the rotating rod 13 drives the rotating plate 15 to rotate. Under the action of the elastic force of the elastic cord 18 and the centrifugal force, the slider 17 moves away from the rotating rod 13 inside the sliding groove 16. At the same time, the slider 17 will contact the connecting plate 225 at the top as the rotating plate 15 rotates. A force acts between the slider 17 and the connecting plate 225, causing the connecting plate 225 to drive the rack 223 to move upward, and then driving the sealing plate 222 to rotate around the rotating rod 221. The flocculant at the top falls into the mixing tank 1. Due to different rotation speeds of the motor 6, the distance of the slider 17 from the rotating rod 13 in the sliding groove 16 is different, and thus the rotation angle of the sealing plate 222 is different, resulting in different amounts of flocculant falling. By setting the slider 17, the amount of flocculant falling into the mixing tank 1 can be adjusted according to the rotation speed of the motor 6, making the mixing more uniform. An elastic cord 18 is fixedly connected to the outer wall of the slider 17. In the initial state, the elastic cord 18 is in a taut state. Both ends of the elastic cord 18 are fixedly connected to two adjacent sliders 17. A curved plate 19 is fixedly connected to one end of the rotating plate 15 close to the filter plate 12. During mixing and dissolution, some flocculants are stacked in blocks. During operation, the motor 6 drives the rotating rod 13 to rotate, the rotating rod 13 drives the rotating plate 15 to rotate, and the rotating plate 15 drives the curved plate 19 to rotate, causing the roller 110 to roll on the filter plate 12 and scrape the surface of the filter plate 12 to prevent the filter plate 12 from being blocked. By setting the filter plate 12, the lumped flocculant in the water is filtered, preventing the lumped flocculant from directly entering the sewage tank through the water outlet pipe, resulting in waste of the drug, prolonging the dissolution of the lumped flocculant and water, and effectively improving the utilization rate of the drug. A roller 110 is rotatably connected to one end of the curved plate 19 close to the filter plate 12.

[0039] In use, an aqueous solution is added through the water inlet pipe 7, so that the motor 6 operates with an external power supply. The operation of the motor 6 drives the rotating rod 13 to rotate. The motor 6 drives the rotating rod 13 to rotate, and the rotating rod 13 drives the rotating plate 15 to rotate. Under the action of the elastic force of the elastic rope 18 and the centrifugal force, the slider 17 moves away from the rotating rod 13 inside the chute 16. At the same time, as the rotating plate 15 rotates, the slider 17 will contact the top connecting plate 225. A force acts between the slider 17 and the connecting plate 225, causing the connecting plate 225 to drive the rack 223 to move upward, thereby driving the sealing plate 222 to rotate around the rotating rod 221. At the same time, the motor 6 drives the rotating shaft 23 to rotate through the transmission member, so that the rotating shaft 23 drives the spiral plate 25 to rotate. The flocculant meeting the standard with a small volume passes through the filter screen 24. At this time, the flocculant at the top falls into the mixing tank 1. Thus, the rotating rod 13 drives the stirring rod 14 to rotate, accelerating the flow of water inside the mixing tank 1 and making the powdery flocculant mix evenly with water.

[0040] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative efforts shall fall within the scope of protection of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A flocculant dosing device for sewage treatment, characterized in that: include: A mixing box, the mixing box having a bottom plate for connecting and supporting, a control box fixedly connected to the top of the mixing box, and a lifting block arranged in the middle of the top of the mixing box, a water inlet pipe fixedly connected to the top of the mixing box, a motor fixedly connected to the outside of the mixing box, and a water outlet pipe fixedly connected to the outside of the mixing box; A screening box, the screening box is fixedly installed on the top of the mixing box; A dry powder bin, the dry powder bin being fixedly mounted on the top of the lifting block on the mixing box; The water outlet pipe and the motor are arranged on adjacent outer sides, the screening box, the dry powder bin and the water inlet pipe are arranged in sequence on the top central axis of the mixing box, the control box is arranged at the edge of the mixing box, a transmission member is arranged on the side of the mixing box away from the motor, and the discharge pipe of the dry powder bin is fixedly connected to the outer side of the box body; The screening box comprises a box body, the interior of the box body is rotatably connected with a rotating shaft, the rotating shaft penetrates the box body and is connected with a transmission member, the inner wall of the box body is fixedly connected with a filter screen, the rotating shaft is located on the axis of the filter screen, the outer side of the rotating shaft is fixedly connected with a spiral plate, the outer wall of the spiral plate is fixedly connected with a spring, the end of the spring away from the spiral plate is fixedly connected with a ball, and the spring is symmetrically arranged with the ball as the center; A support rod is fixedly connected to the middle of the outer side of the rotating shaft, the support rod is located between the two spiral plates, a brush is fixedly connected to one end of the support rod away from the rotating shaft, and a sealing mechanism is provided on the inner wall of the box body, and the sealing mechanism is located below the filter screen; The sealing mechanism includes a rotating rod, which is rotatably connected to the box body, and the rotating rod is symmetrically arranged inside the box body. A sealing plate is fixedly connected to the outer wall of the rotating rod, and there are two sealing plates. A groove is opened on the sealing plate near the middle of the box body, and a protrusion is fixedly connected to the side of the sealing plate near the groove. The protrusions and grooves on the two sealing plates are staggered, and the protrusion is located inside the groove. An end of the sealing plate away from the filter is fixedly connected to a spring plate, and an end of the sealing plate close to the box body has a tooth groove. The inner wall of the box body is slidably connected to a rack, and the rack meshes with the sealing plate gear through the tooth groove. The bottom of the rack is fixedly connected to a connecting plate, and the end of the spring plate away from the sealing plate is fixedly connected to a connecting plate, and the top of the connecting plate is fixedly connected to the spring plate.

2. The flocculant dosing device for sewage treatment according to claim 1, characterized in that: There are multiple spiral plates, which are evenly distributed around the rotating shaft, and one end of the spring away from the ball is fixedly connected to two adjacent spiral plates.

3. The flocculant dosing device for sewage treatment according to claim 1, characterized in that: The mixing box comprises an outer shell, which is fixedly connected to the box body. A through hole is provided on the top of the outer shell, and the outer shell is communicated with the box body through the through hole. A filter plate is fixedly connected to the middle of the outer shell.

4. The flocculant dosing device for sewage treatment according to claim 3 is characterized by: The inner wall of the shell is rotatably connected to a rotating rod, the rotating rod is fixedly connected to the output end of the motor, the outer wall of the rotating rod is fixedly connected to a stirring rod, the outer wall of the rotating rod is fixedly connected to a rotating plate, there are three rotating plates, and the three rotating plates are evenly distributed around the rotating rod.

5. The flocculant dosing device for sewage treatment according to claim 4, characterized in that: The outer wall of the rotating plate is provided with a sliding groove, the inner wall of the sliding groove is slidably connected to a sliding block, the outer wall of the sliding block is fixedly connected to an elastic rope, the two ends of the elastic rope are fixedly connected to two adjacent sliding blocks, the end of the rotating plate close to the filter plate is fixedly connected to a curved plate, and the end of the curved plate close to the filter plate is rotatably connected to a roller.

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