Dosing device and dosing method for sewage treatment

Abstract

The invention relates to the technical field of sewage treatment, and particularly discloses a dosing device for sewage treatment and a dosing method.The dosing device comprises a barrel and a storage tank, two partition plates are fixedly installed in the barrel and divide the interior of the barrel into a water storage cavity, a dosing cavity and a drainage cavity from top to bottom, and the storage tank is arranged in the dosing cavity; a buffer tank is fixedly mounted on the outer side of the storage tank, a sealing disc is arranged in the buffer tank and can ascend and descend in the buffer tank, and the buffer tank communicates with the water storage cavity through a communicating pipe; according to the dosing device for sewage treatment and the dosing method, the sewage is cached in batches by the cache tank, the sewage in the water storage cavity is broken up into parts, the sewage is converged and discharged by the drainage cavity after dosing in batches, and pressurization of the cache tank on the sewage is matched with the Venturi tube to form a negative pressure environment, so that the sewage treatment efficiency is improved. The medicine fed to the port of the air suction pipe is directly sucked into the sewage to be added and mixed, so that the medicine powder is uniformly dispersed in the wastewater in a finer particle size.

Description

Technical Field

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

[0002] Wastewater treatment is the process of removing pollutants from wastewater through physical, chemical, and biological methods to ensure that it meets discharge standards or reuse requirements. In wastewater treatment, specific chemical agents are often added to the wastewater to remove pollutants through physical adsorption, chemical reactions (such as neutralization, redox reactions, and precipitation), or biological synergy.

[0003] In the existing sewage treatment, when adding powder, the powder is often directly thrown from the top of the sewage tank, and the powder and sewage are mixed by stirring. This process is not only prone to forming stirring dead corners, especially for high-viscosity wastewater, the thrown powder is easy to clump in the sewage, and the mixing efficiency is low. In addition, when the powder gradually diffuses from top to bottom into the entire sewage tank, it is easily blocked and adsorbed by the generated precipitation or flocculent suspended matter. It is very easy for the local drug concentration in the sewage tank to be too high or too low, resulting in poor use of the powder. Excessive powder needs to be added to ensure a good sewage treatment effect, which is costly. Summary of the Invention

[0004] The present invention provides a dosing device and a dosing method for sewage treatment, aiming to solve the problem in the related art that the drug powder thrown is easy to agglomerate in the sewage, and the local drug concentration in the sewage tank is very likely to be too high or too low.

[0005] The sewage treatment dosing device of the present invention comprises a cylinder and a storage tank. Two partition plates are fixedly installed inside the cylinder to divide the inside of the cylinder into a water storage chamber, a dosing chamber, and a drainage chamber from top to bottom. The storage tank is arranged inside the dosing chamber. A buffer tank is fixedly installed on the outside of the storage tank, and a sealing disk is provided inside the buffer tank. The sealing disk can be raised and lowered in the buffer tank. The buffer tank and the water storage chamber are connected by a connecting pipe. When the sealing disk is raised, the sewage in the water storage chamber can be pumped into the buffer tank through the connecting pipe. A Venturi tube is provided between the buffer tank and the drainage chamber. When the sealing disk descends, the sewage can be pressed into the Venturi tube. An air intake pipe is provided between the Venturi tube and the storage tank. An auger conveying shaft and a turning rack are provided inside the air intake pipe. The turning rack is fixed to one end of the auger conveying shaft close to the Venturi tube. The auger conveying shaft can rotate in the air intake pipe to convey the powder to the mouth of the air intake pipe and turn it over, so that the powder is mixed into the sewage under the adsorption of the negative pressure in the Venturi tube.

[0006] Preferably, a sealing cover is coaxially rotatably mounted on the top of the storage tank, and the sealing cover is rotatably mounted on the partition plate, and an inner cylinder is fixedly mounted on the bottom of the storage tank.

[0007] Preferably, a base is fixedly installed inside the cache tank, and a reciprocating screw is rotatably installed inside the base. The top end of the reciprocating screw extends to the outside of the cache tank and is rotatably installed on the partition plate. A slider is provided on the outside of the reciprocating screw, which can slide up and down when it rotates. The slider is fixed to the sealing disk, and a transmission gear is fixedly installed on the top end of the reciprocating screw. A gear ring is coaxially fixed to the outside of the cover, and the gear ring is meshed with the transmission gear.

[0008] Preferably, the connecting pipe is located outside the cache tank, the top end of the connecting pipe is connected to the water storage chamber, a first one-way valve is provided between the bottom end of the connecting pipe and the cache tank, and the first one-way valve is located below the sealing disk and can be opened when the sealing disk is raised and closed when the sealing disk is lowered.

[0009] Preferably, the interior of the venturi tube is provided with a conical air chamber and a mixing and diffusion chamber connected thereto, the mixing and diffusion chamber is connected to the drainage chamber, the air chamber is connected to the suction pipe, a water inlet pipe is fixedly installed in the air chamber, a nozzle is provided at the water outlet end of the water inlet pipe, and a second one-way valve is provided between the water inlet end of the water inlet pipe and the buffer tank, which can be opened when the sealing disk descends and closed when the sealing disk rises.

[0010] Preferably, the end of the suction pipe away from the venturi tube passes through the storage tank and extends into the inner cylinder. A notch located in the storage tank is opened on the side wall of the suction pipe. A driven bevel gear located in the inner cylinder is fixedly mounted on the auger conveying shaft, and one side of the driven bevel gear is engaged with a driving bevel gear rotatably assembled on the top of the inner cylinder.

[0011] Preferably, a rotating shaft located in the storage tank is coaxially fixed to the bottom of the cover, and the bottom end of the rotating shaft is fixed to the driving bevel gear. A sliding sleeve is mounted on the outside of the rotating shaft for sliding up and down movement, and a stirring blade is fixedly installed on the side wall of the sliding sleeve.

[0012] Preferably, a connecting rod is fixedly connected to the stirring blade, a guide ring is coaxially fixed to the inner wall of the storage tank, a wavy groove is provided inside the guide ring, and the end of the connecting rod away from the stirring blade is slidably assembled inside the groove.

[0013] Preferably, a stopper is provided at the end of the intake pipe, a spring is provided between the stopper and the intake pipe, and the stopper can overcome the force of the spring and detach from the pipe mouth of the intake pipe under the negative pressure adsorption of the air chamber of the venturi tube.

[0014] A method for adding chemicals for sewage treatment comprises the following steps: Step 1: Inject sewage into the water storage chamber and fill the storage tank with medicine powder; Step 2: Drive the cover to rotate, drive the reciprocating screw to rotate, and at the same time make the rotating shaft drive the stirring blade and the auger conveying shaft to rotate; Step 3: The reciprocating screw drives the sealing disk to lift, pumping negative pressure into the buffer tank, opening the first one-way valve, and pumping the sewage in the water storage chamber into the buffer tank through the connecting pipe; Step 4: The reciprocating screw drives the sealing plate down to pressurize the sewage, causing the second one-way valve to open, and the sewage is pressed into the Venturi tube through the water inlet pipe and the nozzle; Step 5: Negative pressure is formed in the conical air cavity of the venturi tube, the suction block is moved away from the nozzle of the suction pipe, and the powder is sucked into the air cavity from the nozzle of the suction pipe; Step 6: The medicine powder and sewage enter the mixing and diffusion chamber together to complete the mixing, and then converge in the drainage chamber.

[0015] Beneficial effects: When the present invention is in use, the sewage is cached in batches by the buffer tank, the sewage in the water storage chamber is divided into small pieces, and the sewage is collected and discharged from the drainage chamber after batch addition of medicine, which can effectively improve the uniformity of mixing of medicine powder and sewage and improve the mixing efficiency. The pressurization of the sewage by the buffer tank cooperates with the venturi tube to form a negative pressure environment, and the medicine delivered to the suction pipe port is directly sucked into the sewage for adding and mixing. The fluid vortex caused by the negative pressure will actively tear the agglomerated particles, so that the medicine powder is evenly dispersed in the wastewater with a finer particle size, thereby achieving efficient dispersion and mixing of the medicine powder and wastewater, and effectively avoiding the agglomeration of the medicine powder in the sewage. Adding the medicine during the flow of sewage can effectively avoid the precipitation or flocs generated by the reaction blocking the diffusion of the medicine powder, avoid the occurrence of excessively high or low local drug concentrations in the sewage, and improve the dosing effect of the sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a perspective view of the present invention.

[0017] Figure 2 It is a cross-sectional view of the present invention.

[0018] Figure 3 This invention Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0019] Figure 4 This invention Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0020] Figure 5 It is a schematic diagram of the structure inside the medicine adding chamber of the present invention.

[0021] Figure 6 It is a three-dimensional view of the sealing disk of the present invention.

[0022] Reference numerals: 10. Cylinder; 11. Partition plate; 12. Water storage chamber; 13. Dosing chamber; 14. Drainage chamber; 20. Storage tank; 21. Sealing cover; 211. Gear ring; 22. Feed pipe; 23. Inner cylinder; 24. Guide ring; 25. Fluctuation groove; 30. Buffer tank; 31. Sealing plate; 32. Limiting groove; 33. Limiting block; 34. Connecting pipe; 35. First one-way valve; 40. Lifting assembly; 41. Base; 42. Reciprocating screw; 421. Transmission Driven gear; 43, slider; 50, dosing assembly; 51, venturi tube; 52, water inlet pipe; 53, nozzle; 54, second one-way valve; 55, suction pipe; 60, feeding assembly; 61, auger conveying shaft; 611, driven bevel gear; 612, driving bevel gear; 62, turning rack; 70, mixing assembly; 71, rotating shaft; 72, sliding sleeve; 73, stirring blade; 731, connecting rod; 80, sealing assembly; 81, block; 82, spring. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0024] like Figures 1 to 6 As shown, the dosing device for sewage treatment of the present invention includes a cylinder 10, a storage tank 20, a buffer tank 30, a lifting component 40, a dosing component 50, a feeding component 60, a mixing component 70 and a sealing component 80. The storage tank 20 is arranged in the cylinder 10 for storing medicinal powder, and can mix the various medicinal powders stored therein under the action of the mixing component 70, and then the medicinal powder is sent out by the feeding component 60. The buffer tank 30 and the dosing component 50 are located on the outside of the storage tank 20. The buffer tank 30 can cache the sewage in batches under the action of the lifting component 40, and can pressurize the cached sewage and then send it into the dosing component 50 for discharge, so that the sewage forms a negative pressure inside the dosing component 50, and the medicinal powder sent out by the feeding component 60 is adsorbed into the dosing component 50, and quickly mixed with the sewage to complete the dosing.

[0025] refer to Figure 1 and Figure 2 Two upper and lower partition plates 11 are fixedly installed inside the cylinder 10, and the two partition plates 11 divide the internal space of the cylinder 10 from top to bottom into a water storage chamber 12, a dosing chamber 13 and a drainage chamber 14. A water injection pipe and a drainage pipe are provided on the cylinder 10, which are connected to the water storage chamber 12 and the drainage chamber 14 respectively.

[0026] refer to Figure 1 、 Figure 2 as well as Figure 3The storage tank 20 is arranged inside the dosing chamber 13 and is coaxially arranged with the cylinder 10. The top of the storage tank 20 is coaxially rotatably equipped with a cover 21, and the cover 21 is rotatably assembled on the partition plate 11. A motor is fixedly installed on the top of the cylinder 10, and the output shaft of the motor is fixed to the cover 21 to drive the cover 21 to rotate in the dosing chamber 13. A feeding pipe 22 is inserted into the side wall of the storage tank 20. There are multiple feeding pipes 22, all of which pass through the water storage chamber 12 and extend to the top of the cylinder 10 to facilitate the replenishment of the powder in the storage tank 20. An inner cylinder 23 with an open lower end is fixedly installed at the bottom of the storage tank 20.

[0027] refer to Figure 2 、 Figure 5 as well as Figure 6 There are multiple cache tanks 30, all of which are fixedly installed in the dosing chamber 13 and are evenly distributed in a ring along the circumferential direction of the storage tank 20. They are all fixed to the storage tank 20. A sealing disk 31 is provided inside the cache tank 30, and the sealing disk 31 can be raised and lowered in the cache tank 30, and when it is raised, it draws negative pressure into the cache tank 30, and when it is lowered, it pressurizes the sewage in the cache tank 30. A limiting groove 32 is provided on the inner wall of the cache tank 30, and a limiting block 33 is fixedly installed on the side wall of the sealing disk 31, and the limiting block 33 is slidably assembled in the inside of the limiting groove 32, thereby limiting the sealing disk 31, so that the sealing disk 31 can only slide up and down in the cache tank 30, but cannot rotate.

[0028] A connecting pipe 34 is provided on the outside of the cache tank 30, and the top of the connecting pipe 34 is connected to the water storage chamber 12. A first one-way valve 35 is provided between the bottom end of the connecting pipe 34 and the cache tank 30, and the first one-way valve 35 is located below the sealing disk 31. It can be opened when the sealing disk 31 is raised to draw negative pressure into the cache tank 30, so that the sewage in the water storage chamber 12 is drawn into the cache tank 30 through the connecting pipe 34. It can be closed when the sealing disk 31 is lowered to increase the pressure of the sewage in the cache tank 30, so that the sewage will not return to the water storage chamber 12 through the connecting pipe 34.

[0029] refer to Figure 2 and Figure 5 The lifting assembly 40 includes a base 41, a reciprocating screw 42 and a slider 43. The base 41 is fixedly installed in the cache tank 30 at one end close to the first one-way valve 35. The reciprocating screw 42 is coaxially arranged in the cache tank 30, and its bottom end is rotatably assembled on the base 41, and the top end extends to the outside of the cache tank 30 and is rotatably assembled on the partition plate 11. The slider 43 is arranged on the outside of the reciprocating screw 42 and is fixed to the sealing disk 31. It can move back and forth up and down when the reciprocating screw 42 rotates, thereby driving the sealing disk 31 to move up and down in the cache tank 30.

[0030] A transmission gear 421 is fixedly installed on the top of the reciprocating screw 42, and a ring gear 211 is coaxially fixed on the outer side of the cover 21, and the ring gear 211 is engaged with the transmission gear 421. When the cover 21 rotates, the ring gear 211 can push the transmission gear 421 to rotate, so that the reciprocating screw 42 rotates in the cache tank 30.

[0031] refer to Figure 2 and Figure 5 The dosing assembly 50 includes a venturi tube 51, a water inlet pipe 52, a nozzle 53, a second one-way valve 54 and an air intake pipe 55. The venturi tube 51 is arranged between the buffer tank 30 and the drainage chamber 14. A conical air chamber and a mixing and diffusion chamber connected thereto are arranged inside the venturi tube 51, and the mixing and diffusion chamber of the venturi tube 51 is connected to the drainage chamber 14. The water inlet pipe 52 is fixedly assembled in the air chamber of the venturi tube 51. The nozzle 53 is arranged at the water outlet end of the water inlet pipe 52. The second one-way valve 54 is arranged between the water inlet pipe 52 and the buffer tank 30. The second one-way valve 54 can be opened when the sealing disk 31 descends to increase the pressure of the sewage in the buffer tank 30, so that the high-pressure sewage can enter the air chamber of the venturi tube 51 from the water inlet pipe 52; the second one-way valve 54 can also ... The sealing disk 31 is closed when it is raised, so as to draw negative pressure into the buffer tank 30 and replenish sewage. The suction pipe 55 is inserted into the side wall of the venturi tube 51 and communicates with the air chamber. The end of the suction pipe 55 away from the venturi tube 51 passes through the storage tank 20 and extends into the inner cylinder 23. The side wall of the suction pipe 55 is provided with a gap located in the storage tank 20 so that the powder can enter the suction pipe 55 through the gap. When the high-pressure sewage enters the mixing diffusion chamber from the air chamber of the venturi tube 51, a negative pressure will be formed in the air chamber, and the powder in the suction pipe 55 will be sucked into the air chamber and enter the mixing diffusion chamber together with the sewage to add the powder. Through the dual effects of air flow entrainment in the negative pressure and fluid turbulence, efficient dispersion of the powder and sewage is achieved, effectively avoiding powder agglomeration and shortening the reaction time.

[0032] refer to Figure 3 The feeding assembly 60 includes an auger conveying shaft 61 and a tipping rack 62. The auger conveying shaft 61 is rotatably assembled inside the suction pipe 55. The tipping rack 62 is fixedly installed on one end of the auger conveying shaft 61 close to the venturi tube 51, and the side wall of the tipping rack 62 is arranged close to the inner wall of the suction pipe 55. The auger conveying shaft 61 can rotate in the suction pipe 55 to push the powder toward the drug outlet end of the suction pipe 55, that is, the end close to the venturi tube 51, and the tipping rack 62 flips the powder gathered at the drug outlet end of the suction pipe 55 to avoid accumulation and blockage of the powder in the suction pipe 55, so as to facilitate the powder to be sucked into the venturi tube 51 under the action of negative pressure.

[0033] A driven bevel gear 611 located in the inner cylinder 23 is fixedly mounted on the auger conveying shaft 61. One side of the driven bevel gear 611 is engaged with a driving bevel gear 612 rotatably assembled on the top of the inner cylinder 23. The driving bevel gear 612 can rotate synchronously with the rotation of the cover 21, driving the driven bevel gear 611 to rotate, and then rotating the auger conveying shaft 61.

[0034] refer to Figure 2 and Figure 4 The mixing assembly 70 includes a rotating shaft 71, a sliding sleeve 72 and a stirring blade 73. The rotating shaft 71 is located in the storage tank 20 and is coaxially fixed to the bottom of the cover 21. The bottom end of the rotating shaft 71 is fixed to the active bevel gear 612. The sliding sleeve 72 is slidably assembled on the outside of the rotating shaft 71. The stirring blade 73 is fixedly installed on the side wall of the sliding sleeve 72. The rotating shaft 71 can rotate with the cover 21, driving the sliding sleeve 72 and the stirring blade 73 to rotate, and then stirring the powder in the storage tank 20 to prevent the powder from accumulating in the storage tank 20 and facilitate the mixing of multiple powders.

[0035] A connecting rod 731 is fixedly connected to the stirring blade 73, and a guide ring 24 is coaxially fixed on the inner wall of the storage tank 20. A wavy undulating groove 25 is provided inside the guide ring 24. The end of the connecting rod 731 away from the stirring blade 73 is slidably assembled inside the undulating groove 25, so that when the stirring blade 73 rotates, the connecting rod 731 is guided by the undulating groove 25 to make the sliding sleeve 72 and the stirring blade 73 fluctuate up and down, thereby improving the stirring effect of the medicine powder.

[0036] refer to Figure 3 The sealing assembly 80 includes a block 81 and a spring 82. The block 81 is arranged at the end of the suction pipe 55, and the spring 82 is arranged between the block 81 and the suction pipe 55. The block 81 can overcome the force of the spring 82 and detach from the pipe mouth of the suction pipe 55 under the negative pressure adsorption of the air chamber of the venturi tube 51, so that the pipe mouth of the suction pipe 55 is open, and then the powder can be sucked into the venturi tube 51. When the negative pressure in the air chamber of the venturi tube 51 disappears, the spring 82 drives the block 81 to return to the original position to seal the pipe mouth of the suction pipe 55, preventing water vapor from entering and causing the powder to become damp and clump together to block the suction pipe 55, thereby ensuring that the equipment maintains a good dosing effect.

[0037] A method for adding chemicals for sewage treatment comprises the following steps: Step 1: inject sewage into the water storage chamber 12, and fill the storage tank 20 with medicine powder through the feed pipe 22; Step 2: The motor drives the cover 21 to rotate, which drives the reciprocating screw 42 to rotate, and the rotating shaft 71 drives the stirring blade 73 and the auger conveying shaft 61 to rotate, so that the powder in the suction pipe 55 moves to the venturi tube 51, and the powder is turned by the turning rack 62; Step 3: The reciprocating screw 42 rotates, pushing the slider 43 to lift the sealing disk 31, pumping negative pressure into the buffer tank 30, opening the first one-way valve 35 and closing the second one-way valve 54, and pumping the sewage in the water storage chamber 12 into the buffer tank 30 through the connecting pipe 34; Step 4: The reciprocating screw 42 continues to rotate, and the slider 43 rises to a certain height and then begins to descend, driving the sealing plate 31 to descend and pressurize the sewage in the buffer tank 30, so that the second one-way valve 54 opens and the first one-way valve 35 closes, and the sewage is pressed into the venturi tube 51 through the water inlet pipe 52 and the nozzle 53; Step 5: The rapid flow of sewage creates a negative pressure in the conical air cavity of the venturi tube 51, causing the suction block 81 to move away from the suction pipe 55, leaving its opening open. The negative pressure then draws the powder into the air cavity from the suction pipe 55. Step 6: The medicine powder and sewage enter the mixing and diffusion chamber together to complete mixing, and then converge in the drainage chamber 14.

[0038] In the present invention, the buffer tank 30 is used to cache the sewage in batches, and the sewage in the water storage chamber 12 is divided into small pieces. After adding medicine in batches, it is collected and discharged from the drainage chamber 14, which can effectively improve the uniformity of mixing of medicine powder and sewage and improve the mixing efficiency. The pressurization of the sewage by the buffer tank 30 cooperates with the venturi tube 51 to form a negative pressure environment, and the medicine delivered to the port of the suction pipe 55 is directly sucked into the sewage for adding medicine and mixing. The fluid vortex caused by the negative pressure will actively tear the agglomerated particles, so that the medicine powder is evenly dispersed in the wastewater with a finer particle size, realizing efficient dispersion and mixing of the medicine powder and wastewater, and effectively avoiding the agglomeration of the medicine powder in the sewage. Adding medicine during the flow of sewage can effectively avoid the precipitation or flocs generated by the reaction blocking the diffusion of the medicine powder, avoid the occurrence of excessively high or low local drug concentrations in the sewage, and improve the dosing effect of the sewage.

[0039] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A dosing device for sewage treatment, comprising a cylinder (10) and a storage tank (20), characterized in that: Two partition plates (11) are fixedly installed inside the cylinder (10), dividing the inside of the cylinder (10) into a water storage chamber (12), a medicine adding chamber (13), and a drainage chamber (14) from top to bottom, and the storage tank (20) is arranged inside the medicine adding chamber (13); A buffer tank (30) is fixedly mounted on the outside of the storage tank (20), a sealing disk (31) is provided inside the buffer tank (30), and the sealing disk (31) can be raised and lowered in the buffer tank (30), and the buffer tank (30) is connected to the water storage chamber (12) through a connecting pipe (34), and when the sealing disk (31) is raised, the sewage in the water storage chamber (12) can be pumped into the buffer tank (30) through the connecting pipe (34); A venturi tube (51) is provided between the buffer tank (30) and the drainage chamber (14). When the sealing disk (31) descends, the sewage can be pressed into the venturi tube (51). An air intake pipe (55) is provided between the venturi tube (51) and the storage tank (20). An auger conveying shaft (61) and a turning rack (62) are provided inside the air intake pipe (55). The turning rack (62) is fixed to one end of the auger conveying shaft (61) close to the venturi tube (51). The auger conveying shaft (61) can rotate in the air intake pipe (55) to convey the powder to the mouth of the air intake pipe (55) and turn it over, so that the powder is mixed and enters the sewage under the adsorption of the negative pressure in the venturi tube (51).

2. The sewage treatment dosing device according to claim 1, characterized in that: The top of the storage tank (20) is coaxially rotatably mounted with a cover (21), and the cover (21) is rotatably mounted on the partition plate (11). The bottom of the storage tank (20) is fixedly mounted with an inner cylinder (23).

3. The sewage treatment dosing device according to claim 2, characterized in that: A base (41) is fixedly installed inside the cache tank (30), and a reciprocating screw (42) is rotatably installed inside the base (41). The top end of the reciprocating screw (42) extends to the outside of the cache tank (30) and is rotatably installed on the partition plate (11). A slider (43) is provided on the outside of the reciprocating screw (42) and can slide up and down when the reciprocating screw (42) rotates. The slider (43) is fixed to the sealing disk (31). A transmission gear (421) is fixed to the top end of the reciprocating screw (42). A gear ring (211) is coaxially fixed to the outside of the cover (21), and the gear ring (211) is meshed with the transmission gear (421).

4. The sewage treatment dosing device according to claim 3, characterized in that: The connecting pipe (34) is located outside the buffer tank (30), the top end of the connecting pipe (34) is connected to the water storage chamber (12), and a first one-way valve (35) is provided between the bottom end of the connecting pipe (34) and the buffer tank (30). The first one-way valve (35) is located below the sealing disk (31) and can be opened when the sealing disk (31) is raised and closed when the sealing disk (31) is lowered.

5. The sewage treatment dosing device according to claim 4, characterized in that: The interior of the venturi tube (51) is provided with a conical air chamber and a mixing and diffusion chamber connected thereto, the mixing and diffusion chamber is connected to the drainage chamber (14), the air chamber is connected to the suction pipe (55), a water inlet pipe (52) is fixedly installed in the air chamber, a nozzle (53) is provided at the water outlet end of the water inlet pipe (52), and a second one-way valve (54) is provided between the water inlet end of the water inlet pipe (52) and the buffer tank (30), which can be opened when the sealing disk (31) descends and closed when the sealing disk (31) rises.

6. The sewage treatment dosing device according to claim 5, characterized in that: The end of the suction pipe (55) away from the venturi tube (51) passes through the storage tank (20) and extends into the inner cylinder (23). A notch located in the storage tank (20) is opened on the side wall of the suction pipe (55). A driven bevel gear (611) located in the inner cylinder (23) is fixedly mounted on the auger conveying shaft (61). One side of the driven bevel gear (611) is meshed with a driving bevel gear (612) rotatably assembled on the top of the inner cylinder (23).

7. The sewage treatment dosing device according to claim 6, characterized in that: A rotating shaft (71) located in the storage tank (20) is coaxially fixed to the bottom of the cover (21), and the bottom end of the rotating shaft (71) is fixed to the driving bevel gear (612). A sliding sleeve (72) is mounted on the outside of the rotating shaft (71) so as to slide up and down, and a stirring blade (73) is fixedly mounted on the side wall of the sliding sleeve (72).

8. The sewage treatment dosing device according to claim 7, characterized in that: A connecting rod (731) is fixedly connected to the stirring blade (73), and a guide ring (24) is coaxially fixed to the inner wall of the storage tank (20). A wavy undulating groove (25) is provided inside the guide ring (24), and an end of the connecting rod (731) away from the stirring blade (73) is slidably assembled inside the undulating groove (25).

9. The sewage treatment dosing device according to claim 8, characterized in that: A stopper (81) is provided at the end of the suction pipe (55), and a spring (82) is provided between the stopper (81) and the suction pipe (55). The stopper (81) can overcome the action of the spring (82) and detach from the pipe opening of the suction pipe (55) under the negative pressure adsorption of the air chamber of the Venturi tube (51).

10. A dosing method for sewage treatment, applicable to the dosing device for sewage treatment according to claim 9, characterized in that: The following steps are involved: Step 1: injecting sewage into the water storage chamber (12) and filling the storage tank (20) with medicine powder; Step 2: driving the cover (21) to rotate, driving the reciprocating screw (42) to rotate, and at the same time causing the rotating shaft (71) to drive the stirring blade (73) and the auger conveying shaft (61) to rotate; Step 3: The reciprocating screw (42) drives the sealing disk (31) to rise, thereby pumping negative pressure into the buffer tank (30), opening the first one-way valve (35), and pumping the sewage in the water storage chamber (12) into the buffer tank (30) through the connecting pipe (34); Step 4: The reciprocating screw (42) drives the sealing plate (31) downward to pressurize the sewage, causing the second one-way valve (54) to open, and the sewage is pressed into the venturi tube (51) through the water inlet pipe (52) and the nozzle (53); Step 5: Negative pressure is formed in the conical air cavity of the venturi tube (51), the suction block (81) is moved away from the tube opening of the suction pipe (55), and the powder is sucked into the air cavity from the port of the suction pipe (55); Step 6: The medicine powder and sewage enter the mixing and diffusion chamber together to complete the mixing, and then converge in the drainage chamber (14).

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