Sewage station medicament stirring device

By designing the conveyor belt and stirring blades in the dosing box, the uneven stirring and sedimentation problems of the sewage station dosing system are solved, the uniform stirring and sedimentation rise of the liquid medicine are achieved, the blockage is avoided, and the sewage treatment efficiency is improved.

CN223381453UActive Publication Date: 2025-09-26CHINA TOBACCO GUANGXI IND
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Patent Information

Application Number
CN202422398585.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-30
Publication Date
2025-09-26
Estimated Expiration
2034-09-30

AI Technical Summary

Technical Problem

The dosing system of the existing sewage station has problems such as insufficient and uneven manual stirring after adding the medicine in the dissolving box, easy precipitation and easy pipe clogging.

Method used

A sewage station chemical stirring device is used, which includes a dosing box, a stirring piece, a conveyor belt, a medicine spoon and a transmission mechanism. The conveyor belt drives the medicine spoon to make the medicine liquid displace up and down in the dosing box. Combined with the design of stirring blades and a scattering disk, the uniform stirring of the medicine liquid and the rise of the sediment are achieved, avoiding the condensation of sediment at the bottom.

Benefits of technology

It achieves uniform and sufficient stirring of the liquid medicine, avoids sedimentation and blockage, improves sewage treatment efficiency, and is easy, fast, safe, stable and efficient to operate.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a sewage station agent stirring device which comprises an agent adding box, a stirring piece is rotatably installed in the agent adding box, a driving piece used for driving the stirring piece to rotate is installed on the outer side of the bottom of the agent adding box, conveying belts are rotatably installed on the two sides of the stirring piece, and a plurality of agent spoons are arranged on the outer surfaces of the conveying belts. A transmission mechanism for driving the conveying belt to transmit is arranged between the dosing box and the stirring piece, so that the medicine spoons can be driven to move upwards or downwards when the conveying belt transmits. The medicine spoons are driven by the conveying belt to transmit, and liquid medicine at the bottom in the medicine adding box is scooped to the top in the medicine adding box in the transmission process of the medicine spoons, so that the liquid medicine in the medicine adding box is subjected to up-and-down replacement, and precipitated and coagulated medicine at the bottom is replaced to the top, the medicine at the bottom of the medicine adding box is prevented from being precipitated and coagulated, and the efficiency of a precipitation tank is improved; the stirring device has the advantages of being uniform and sufficient in stirring, not prone to precipitation and not prone to blockage, simple, convenient and rapid in implementation mode, safe, stable and efficient.
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Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment equipment, in particular to a sewage treatment station agent stirring device. Background Art

[0002] The cigarette manufacturing process generates a certain amount of wastewater, necessitating treatment at a sewage treatment plant. The PAC dosing tanks at sewage treatment plants are divided into a dissolving tank and a temporary storage tank for the liquid. The dosing system typically involves adding chemicals through the dissolving tank and then directly stirring them manually. Manual stirring is labor-intensive and difficult to perform for extended periods of time, and can easily lead to problems such as insufficient and uneven stirring, and sedimentation. If the liquid chemical is stored for extended periods without sufficient stirring, sedimentation and scaling can form, clogging the tank piping and compromising the sewage treatment plant's decontamination capabilities. Utility Model Content

[0003] In view of the above shortcomings, the utility model provides a sewage station reagent stirring device, which can solve the problems of the existing sewage station adding drugs through a dissolving box and then manually stirring, which is insufficient, uneven, easy to precipitate, and easy to clog the pipeline.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A sewage station drug stirring device includes a drug dosing box, a stirring piece is rotatably installed inside the drug dosing box, a driving piece for driving the stirring piece to rotate is installed on the outer side of the bottom of the drug dosing box, conveyor belts are rotatably installed on both sides of the stirring piece, and a plurality of drug spoons are provided on the outer surface of the conveyor belt. A transmission mechanism for driving the conveyor belt is provided between the drug dosing box and the stirring piece, so that the conveyor belt can drive the drug spoon to move upward or downward when the conveyor belt is driven.

[0006] Preferably, the stirring member includes a support frame, which is rotatably arranged inside the medicine-dosing box, and a rotating shaft is fixedly installed on the bottom of the support frame. The rotating shaft is rotatably installed on the bottom wall of the medicine-dosing box, passes through the medicine-dosing box and is connected to the driving member. Conveyor belt mounting grooves are provided on both sides of the support frame, and the conveyor belt is arranged in the conveyor belt mounting grooves. Two stirring blades are respectively installed on both sides of the support frame.

[0007] Preferably, the upper and lower ends of both sides of the support frame are provided with rotation slots for the medicine spoon;

[0008] The transmission mechanism includes a shaft rod, which is rotatably installed in the four rotating slots of the medicine spoons respectively. The four shaft rods are fixedly installed with conveying rollers, and the conveying rollers are located in the rotating slots of the medicine spoons respectively. The two conveyor belts are respectively mounted on the peripheries of the two conveying rollers located on both sides. The two shaft rods located above are installed with gears, and the inner wall of the medicine adding box is installed with a gear ring, and the gear and the gear ring are engaged with each other.

[0009] Preferably, a dosing hopper is provided on the top of the dosing box, a mixing tube is provided on the inner top wall of the dosing box facing the dosing hopper, a plurality of mixing plates distributed from top to bottom are vertically provided on the inner wall of the mixing tube, and the plurality of mixing plates are staggered in sequence.

[0010] Preferably, a scattering disk is provided on the top of the stirring element, and a plurality of arc-shaped plates are provided in a circular array on the upper surface of the scattering disk.

[0011] Preferably, the upper surface of the scattering plate has a structure that is low in the middle and high around the edges.

[0012] Preferably, the plurality of arc-shaped plates are in an arc-shaped or S-shaped structure.

[0013] Preferably, an inspection door is rotatably provided on one side of the medicine adding box, and a sealing ring is provided between the inspection door and the side wall of the medicine adding box.

[0014] Preferably, a medicine outlet pipe is provided on one side of the bottom end of the medicine adding box.

[0015] Preferably, three supporting legs are installed at the bottom of the medicine adding box, and universal wheels are installed at the bottom of the three supporting legs.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The utility model drives the medicine spoon to be transmitted through the conveyor belt. During the transmission process, the medicine spoon scoops the medicine liquid at the bottom of the medicine adding box to the inner top of the medicine adding box, so that the medicine liquid inside the medicine adding box is replaced up and down, and the medicine precipitated and condensed at the bottom is replaced to the top, avoiding the precipitation and condensation of the medicine at the bottom of the medicine adding box, improving the efficiency of the sedimentation tank, avoiding the blockage of the medicine pipe, having the advantages of uniform and sufficient stirring, not easy to precipitate, and not easy to clog, and the implementation method is simple, fast, safe, stable and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments.

[0019] Figure 1 This is a structural diagram of the sewage station reagent stirring device of the utility model;

[0020] Figure 2 This is a schematic structural diagram of the stirring element, conveyor belt, medicine spoon and transmission mechanism of the utility model;

[0021] Figure 3 This is a schematic structural diagram of the stirring element and the breaking plate of the utility model;

[0022] Figure 4 This is a structural diagram of the conveyor belt and medicine spoon of the utility model;

[0023] Figure 5 This is a structural diagram of the scattering disc and mixing tube of the utility model;

[0024] Figure 6 It is a schematic cross-sectional structural diagram of the mixing tube of the present invention.

[0025] Explanation of the numbers in the schematic diagram:

[0026] 1. Dosing box; 11. Inspection door; 12. Drug outlet pipe; 13. Support legs; 14. Universal wheels;

[0027] 2. Stirring element; 21. Support frame; 22. Rotating shaft; 23. Conveyor belt mounting slot; 24. Rotating slot for medicine spoon; 25. Stirring blade;

[0028] 3. Conveyor belt;

[0029] 4. Medicine spoon;

[0030] 5. Break up the plate; 51. Curved plate;

[0031] 6. Driving parts;

[0032] 7. Shaft; 71. Conveyor roller; 72. Gear; 73. Ring gear;

[0033] 8. Dosing hopper; 81. Mixing tube; 82. Mixing plate. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Please refer to Figures 1 to 6 An exemplary preferred embodiment of the present invention provides a sewage treatment plant drug stirring device, comprising a drug adding tank 1, a stirring member 2, a driving member 6, two conveyor belts 3, a plurality of drug spoons 4, a transmission mechanism, a dispersing disc 5, and a plurality of curved plates 51. The sewage treatment plant drug stirring device of the present invention can replace the existing sewage treatment plant drug dissolving tank to dissolve the drug.

[0038] Please refer to Figure 1 Specifically, an inspection door 11 is rotatably provided on one side of the dosing box 1, and a sealing ring is provided between the inspection door 11 and the side wall of the dosing box 1. The inspection door 11 is used for internal inspection of the equipment. The inspection door 11 is opened during inspection and closed during normal use. The sealing ring prevents the solution from leaking from the gap between the inspection door 11 and the side wall of the dosing box 1, thereby achieving a good sealing effect. A drug outlet pipe 12 is provided on one side of the bottom end of the dosing box 1 for discharging the stirred drug solution. The drug outlet pipe 12 can be equipped with a valve to control the on-off. Three supporting legs 13 are installed at the bottom of the dosing box 1, and universal wheels 14 are installed at the bottom of the three supporting legs 13. The universal wheels 14 are provided to facilitate the movement of the equipment. Furthermore, the universal wheels 14 are universal wheels with a self-locking function, so that they can self-lock and remain motionless when moved to a certain position.

[0039] Please refer to Figure 1 、 Figure 5 and Figure 6Preferably, a dosing hopper 8 is provided on the top of the dosing box 1, and a mixing tube 81 is provided on the inner top wall of the dosing box 1, facing the dosing hopper 8. A plurality of mixing plates 82 are vertically provided on the inner wall of the mixing tube 81, distributed from top to bottom, and the plurality of mixing plates 82 are staggered in sequence. The medicine is added from the dosing hopper 8 and then falls into the interior of the dosing box 1 through the mixing tube 81. In a preferred embodiment, the mixing plates 82 are semi-funnel-shaped, that is, low in the middle and high on the outer periphery, and the plurality of mixing plates 82 are staggered left and right. The staggered mixing plates 82 will cause the multiple medicines to fall in a Z-shaped manner in the mixing tube 81, thereby achieving initial mixing of the (multiple) medicines.

[0040] like Figures 2 to 3 As shown, in a preferred embodiment, the stirring member 2 is rotatably mounted inside the dosing box 1, and the driving member 6 is a motor. The motor is mounted on the bottom wall of the dosing box 1, located outside the dosing box 1, and the output end of the motor is interconnected with the bottom of the stirring member 2 so as to be able to drive the stirring member 2 to rotate through the driving member 6 of the motor. The scattering disk 5 is mounted on the top of the stirring member 2, and the scattering disk 5 is located directly below the mixing tube 81. The upper surface of the scattering disk 5 is provided with a plurality of arc plates 51 in a circumferential array. The plurality of arc plates 51 are distributed in a circumferential array, with one end located at the center of the scattering disk 5 and the other end located at the edge of the scattering disk 5. Furthermore, the upper surface of the scattering disk 5 has a structure that is low in the middle and high around, and the arc plates 51 are all S-shaped. During implementation, the driving member 6 of the motor drives the stirring member 2 to rotate, and the stirring member 2 drives the scattering disk 5 to rotate. The initially mixed medicine falls into the top center of the scattering disk 5 through the mixing tube 81. When the scattering disk 5 rotates at high speed, the medicine will be thrown around by the centrifugal force. At the same time, the medicine thrown around will be blocked by the arc plate and the movement trajectory will be changed, so that the medicine is evenly sprinkled in the medicine adding box 1, so as to achieve uniform dosing in the medicine adding box 1.

[0041] Depend on Figures 3 and 4 As shown, the stirring member 2 is rotatably installed inside the medicine adding box 1 , and the stirring member 2 includes a support frame 21 , a rotating shaft 22 , two conveyor belt mounting grooves 23 , a medicine spoon rotating slot 24 and a stirring blade 25 .

[0042] Specifically, the support frame 21 is rotatably mounted within the medicine-adding box 1. The rotating shaft 22 is mounted at the bottom of the support frame 21 and is rotatably mounted on the bottom wall of the medicine-adding box 1. The bottom of the rotating shaft 22 extends out of the medicine-adding box 1 and is interconnected with the output end of the driving member 6 of the motor. The portion of the rotating shaft 22 extending out of the medicine-adding box 1 may be provided with a sealing ring or the like to ensure sealing. Two conveyor belt mounting slots 23 are provided on either side of the support frame 21 and extend vertically. Four medicine spoon rotation slots 24 and four stirring blades 25 are provided. The four medicine spoon rotation slots 24 correspond to the upper and lower ends of the support frame 21, and the four medicine spoon rotation slots 24 are connected to the upper and lower ends of the two conveyor belt mounting slots 23. The four stirring blades 25 are respectively mounted on either side of the support frame 21. That is, two stirring blades 25 are installed on each side of the support frame 21. The two stirring blades 25 form a set and are located on either side of the conveyor belt mounting slot 23. The driving member 6 of the motor drives the four stirring blades 25 to rotate through the support frame 21. The four stirring blades 25 stir the solution inside the medicine adding box 1 so that the internal medicine solution is mixed evenly.

[0043] A conveyor belt 3 is rotatably mounted on either side of the stirring element 2. Multiple medicine spoons 4 are mounted on the outer surface of the conveyor belt 3. A transmission mechanism is provided between the medicine dosing box 1 and the stirring element 2 to drive the conveyor belt 3. This mechanism allows the medicine spoons 4 to move upward or downward when the conveyor belt 3 is in motion. In operation, the medicine spoons 4 are semicircular in shape, opening upward as the conveyor belt 3 moves upward. As the conveyor belt 3 drives the medicine spoons 4, they pass through medicine spoon rotation slots 24 defined at the upper and lower ends of the support frame 21. By driving the medicine spoons up and down with the conveyor belt 3, the upward movement of the medicine spoons brings the liquid medicine at the bottom of the medicine dosing box 1 to the inner top, displacing the liquid medicine within the medicine dosing box 1.

[0044] Please refer to Figures 2 to 4 The transmission mechanism is installed on the support frame 21, and the transmission mechanism includes four shafts 7, four conveying rollers 71, two gears 72 and a gear ring 73.

[0045] Specifically, the four shafts 7 are rotatably installed at the upper and lower ends on both sides of the support frame 21, and the four shafts 7 are respectively located in the four medicine spoon rotation slots 24, and the four conveying rollers 71 are respectively fixedly installed on the four shafts 7. The two conveyor belts 3 are respectively sleeved and installed on the periphery of the two conveyor rollers 71 on both sides. The two conveyor belts 3 are respectively located in the two conveyor belt mounting grooves 23. Multiple medicine spoons 4 are respectively installed on the outer surfaces (outward sides) of the two conveyor belts 3. The two gears 72 are respectively installed on the two shafts 7 at the top ends on both sides of the support frame 21, specifically on the outward ends of the two shafts 7. The ring gear 73 is installed on the inner wall of the top of the medicine adding box 1, and the two gears 72 are engaged with the ring gear 73.

[0046] During implementation, the shaft 7 rotates along with the support frame 21. During the rotation of the shaft 7 along with the support frame 21, the gear 72 rotates along the ring gear 73, and then the shaft 7 rotates on itself. The shaft 7 drives the conveying roller 71 thereon to rotate, and the conveying roller 71 drives the conveyor belt 3 to transmit. The conveyor belt 3 drives the medicine spoon 4 to move up and down. During the movement, the medicine spoon 4 scoops the medicine liquid at the bottom of the medicine dosing box 1 to the inner top of the medicine dosing box 1, so that the medicine liquid inside the medicine dosing box 1 is replaced up and down, and the medicine precipitated and condensed at the bottom is replaced to the top, and then stirred and broken up by the stirring blade 25 to make it mixed evenly, thereby avoiding the precipitation and condensation of the medicine at the bottom of the medicine dosing box 1.

[0047] The sewage station drug stirring device of the present invention is provided with a drug adding box 1, a stirring member 2, a driving member 6, two conveyor belts 3, multiple drug spoons 4, a transmission mechanism, a scattering disk 5 and a mixing tube 81 and other components. The multiple drugs are initially mixed by the mixing tube 81 and the mixing plate 82 therein. The initially mixed drugs fall onto the top of the scattering disk 5. When the scattering disk 5 rotates at a high speed, the drugs are thrown to the surroundings by the centrifugal force. At the same time, the drugs thrown to the surroundings will be blocked by the arc plate and the motion trajectory will be changed, so that the drugs are evenly sprinkled in the drug adding box 1.

[0048] The conveyor belt 3 drives the medicine spoon 4 to move. During the movement, the medicine spoon 4 scoops the medicine liquid at the bottom of the medicine dosing box 1 to the inner top of the medicine dosing box 1, so that the medicine liquid inside the medicine dosing box 1 is replaced up and down, and the medicine precipitated and condensed at the bottom is replaced to the top, and then stirred and broken up by the stirring blade 25 to make it evenly mixed, thereby avoiding the precipitation and condensation of the medicine at the bottom of the medicine dosing box 1 and avoiding affecting the decontamination capacity of the sewage station. It has many advantages such as uniform and sufficient stirring, simple and fast, safe, stable and efficient, high qualified rate, energy saving and environmental protection.

[0049] When the present invention is used, the medicine is added from the medicine feeding hopper 8, and then falls into the interior of the medicine feeding box 1 through the mixing tube 81. The mixing plates 82 staggered on the left and right will make the medicine fall in a Z shape in the mixing tube 81, thereby performing the initial mixing of the multiple medicines; the driving member 6 drives the stirring member 2 to rotate, and the stirring member 2 drives the scattering disk 5 to rotate, and the initially mixed medicine falls on the top of the scattering disk 5. When the scattering disk 5 rotates at a high speed, the medicine is thrown to the surroundings by the centrifugal force. At the same time, the medicine thrown to the surroundings will be blocked by the arc plate and the movement trajectory will be changed, thereby making the medicine evenly sprinkled in the medicine feeding box 1; the driving member 6 is connected to the support frame 21 The four stirring blades 25 are driven to rotate along with the support frame 21, and the four stirring blades 25 stir the solution inside the medicine-dosing box 1. The shaft 7 rotates along with the support frame 21, and the gear 72 rotates along the ring gear 73, and then the shaft 7 rotates. The shaft 7 drives the conveying roller 71 to rotate, and the conveying roller 71 drives the conveyor belt 3 to transmit, and the conveyor belt 3 drives the medicine spoon 4 to transmit. During the transmission process, the medicine spoon 4 scoops the medicine liquid at the bottom of the medicine-dosing box 1 to the inner top of the medicine-dosing box 1, so that the medicine liquid inside the medicine-dosing box 1 is replaced up and down, and the precipitated and condensed medicine at the bottom is replaced to the top, and then stirred and dispersed by the stirring blades 25 to make it evenly mixed.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A sewage station chemical stirring device, comprising a chemical adding box (1), characterized in that: A stirring member (2) is rotatably mounted inside the medicine-dosing box (1), a driving member (6) for driving the stirring member (2) to rotate is mounted on the outer side of the bottom of the medicine-dosing box (1), a conveyor belt (3) is rotatably mounted on both sides of the stirring member (2), a plurality of medicine spoons (4) are arranged on the outer surface of the conveyor belt (3), and a transmission mechanism for driving the conveyor belt (3) to transmit is arranged between the medicine-dosing box (1) and the stirring member (2), so that the medicine spoon (4) can be driven to move upward or downward when the conveyor belt (3) is transmitted.

2. The sewage station reagent stirring device according to claim 1, characterized in that: The stirring member (2) includes a support frame (21), the support frame (21) is rotatably arranged inside the medicine-dosing box (1), a rotating shaft (22) is fixedly installed at the bottom of the support frame (21), the rotating shaft (22) is rotatably installed on the bottom wall of the medicine-dosing box (1), passes through the medicine-dosing box (1) and is connected to the driving member (6), a conveyor belt mounting groove (23) is provided on both sides of the support frame (21), the conveyor belt (3) is arranged in the conveyor belt mounting groove (23), and two stirring blades (25) are respectively installed on both sides of the support frame (21).

3. The sewage station reagent stirring device according to claim 2, characterized in that: The upper and lower ends of both sides of the support frame (21) are provided with medicine spoon rotation slots (24); The transmission mechanism includes a shaft (7), and the shaft (7) is rotatably mounted in the four medicine spoon rotating slots (24) in a one-to-one correspondence. The four shafts (7) are fixedly mounted with conveying rollers (71), and the conveying rollers (71) are located in the medicine spoon rotating slots (24) in a one-to-one correspondence. The two conveyor belts (3) are respectively sleeved and mounted on the peripheries of the two conveying rollers (71) located on both sides. The two shafts (7) located above are mounted with gears (72). The inner wall of the medicine adding box (1) is mounted with a gear ring (73), and the gear (72) and the gear ring (73) are meshed with each other.

4. The sewage station reagent stirring device according to claim 1, characterized in that: A dosing hopper (8) is provided on the top of the dosing box (1), and a mixing tube (81) facing the dosing hopper (8) is provided on the inner top wall of the dosing box (1). A plurality of mixing plates (82) distributed from top to bottom are vertically provided on the inner wall of the mixing tube (81), and the plurality of mixing plates (82) are staggered in sequence.

5. The sewage station reagent stirring device according to claim 1, characterized in that: A scattering disc (5) is provided on the top of the stirring member (2), and a plurality of arc-shaped plates (51) are provided in a circumferential array on the upper surface of the scattering disc (5).

6. The sewage station reagent stirring device according to claim 5, characterized in that: The upper surface of the scattering plate (5) is in a structure with a lower middle and higher surroundings.

7. The sewage station reagent stirring device according to claim 5, characterized in that: The plurality of arc-shaped plates (51) are in an arc-shaped or S-shaped structure.

8. The sewage station reagent stirring device according to claim 1, characterized in that: An inspection door (11) is rotatably provided on one side of the medicine adding box (1), and a sealing ring is provided between the inspection door (11) and the side wall of the medicine adding box (1).

9. The sewage station reagent stirring device according to claim 1, characterized in that: A medicine outlet pipe (12) is provided on one side of the bottom end of the medicine adding box (1).

10. The sewage station reagent stirring device according to claim 1, characterized in that: Three supporting legs (13) are installed at the bottom of the medicine adding box (1), and universal wheels (14) are installed at the bottoms of the three supporting legs (13).