Accurate metering sewage treatment dosing device

Abstract

The application relates to the sewage treatment field and discloses a precise metering sewage treatment dosing device, which comprises a sewage treatment cabinet and a dosing mechanism arranged on the sewage treatment cabinet. The dosing mechanism comprises a medicine cartridge, a medicine outlet pipe, an electromagnetic discharge valve, a backing plate, a weight sensor, an L-shaped support and a medicine crushing assembly. The medicine cartridge is located above the sewage treatment cabinet, and the medicine outlet pipe is fixedly installed at the bottom center of the medicine cartridge. The application has the following advantages and effects: the dosing amount can be accurately metered according to the actual demand of sewage treatment, the dosing amount is prevented from being too much or too little, the sewage treatment effect and the medicine utilization rate are improved, the cost is reduced, the granular medicine can be effectively ground and crushed to be finer particles, the fine particles of the medicine can be uniformly and widely scattered into the sewage, the medicine can be dissolved in the sewage faster, and the sewage treatment effect and efficiency can be improved.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a precise metering wastewater treatment dosing device. Background Technology

[0002] During wastewater treatment, chemical dosing is a common and crucial process that effectively removes pollutants and regulates water quality. A patent document with authorization publication number CN222138723U discloses a wastewater treatment chemical dosing device, including a support tank, a treatment tank, support legs, a tank cover, and a spraying assembly. Chemical agents are introduced through a dosing pipe into the spraying tank and then sprayed out through an outlet. A motor drives a rotating rod, which in turn drives a first bevel gear, which in turn drives a second bevel gear and the dosing pipe. The rotation of the dosing pipe, in turn, drives the spraying tank, expanding the spraying range of the chemical agents and ensuring even distribution in the wastewater. The rotation of the spraying tank also drives a connecting rod and stirring blades, ensuring sufficient contact and reaction between the chemical agents and the wastewater.

[0003] The aforementioned solutions have been found to have at least the following shortcomings in practical use: Most existing wastewater treatment dosing devices lack the function of accurately metering the added chemicals, easily leading to over- or under-dosing. Over-dosing not only wastes chemicals and increases treatment costs but may also cause secondary pollution. Under-dosing fails to achieve the expected treatment effect, resulting in wastewater failing to meet discharge standards. Furthermore, depending on the type of wastewater being treated, the added chemicals may be solid granules or liquids. However, most existing wastewater treatment dosing devices lack the function of pulverizing granular chemicals, failing to grind and break them into finer particles before dispersing them in the wastewater. This reduces the dissolution rate of granular chemicals in the wastewater, thus affecting the wastewater treatment effect and efficiency.

[0004] Therefore, we propose a precise metering wastewater treatment dosing device to solve the above problems. Utility Model Content

[0005] The purpose of this application is to provide a precise metering wastewater treatment dosing device that can accurately meter the dosage according to the actual needs of wastewater treatment, avoiding over- or under-dosing, improving wastewater treatment effect and drug utilization rate, reducing costs, and effectively grinding and crushing granular drugs into finer particles. It can also disperse these fine particles evenly and over a wide area into the wastewater, so that they can dissolve in the wastewater more quickly, thereby enhancing the wastewater treatment effect and efficiency.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution: a precise metering sewage treatment dosing device, comprising a sewage treatment cabinet and a dosing mechanism installed on the sewage treatment cabinet, the dosing mechanism comprising a dosing cartridge, a dosing pipe, an electromagnetic discharge valve, a pad, a weight sensor, an L-shaped bracket and a drug crushing assembly, the dosing cartridge being located above the sewage treatment cabinet, the dosing pipe being fixedly installed at the bottom center of the dosing cartridge, the electromagnetic discharge valve being fixedly installed on the dosing pipe, an clearance hole being provided at the top of the sewage treatment cabinet, the bottom end of the dosing pipe passing through the clearance hole, the pad being fixedly installed at the top of the sewage treatment cabinet, the weight sensor being fixedly installed at the top of the pad, the L-shaped bracket being fixedly installed at the top of the weight sensor, and one end of the L-shaped bracket being fixedly connected to the outer wall of the dosing cartridge.

[0007] A further feature of this application is that the bottom inner wall of the cartridge is a concave arc-shaped surface structure, and the inner diameter of the clearance hole is larger than the outer diameter of the outlet tube.

[0008] A further configuration of this application is as follows: the drug crushing assembly includes an annular seat, a bearing, a drug delivery tube, a trumpet-shaped grinding shroud, a trumpet-shaped grinding seat, multiple grinding protrusions (first type), multiple grinding protrusions (second type), a column, a material distribution plate, and a shaft seat. The annular seat is fixedly installed on the top inner wall of the wastewater treatment tank. The drug delivery tube is rotatably installed inside the annular seat via the bearing. The bottom of the drug delivery tube extends outside the annular seat, and the bottom end of the discharge tube extends inside the drug delivery tube. The trumpet-shaped grinding shroud is fixedly installed at the bottom of the drug delivery tube, and the trumpet-shaped grinding seat is located inside the trumpet-shaped grinding shroud. Multiple grinding protrusions (first type) are all fixedly installed on the trumpet-shaped grinding shroud. The grinding hood has multiple grinding protrusions evenly distributed on its inner sidewall. These protrusions are fixedly installed on the outer sidewall of the horn-shaped grinding base and are also evenly distributed. The grinding protrusions are arranged in an alternating pattern. The column is fixedly installed at the bottom of the horn-shaped grinding base, with the bottom end of the column extending outside the horn-shaped grinding hood. The material distribution plate is fixedly fitted onto the column, with the upper surface of the material distribution plate slidingly contacting the bottom surface of the horn-shaped grinding hood. The material distribution plate has multiple evenly distributed oblique holes. The shaft seat is fixedly installed on the bottom inner wall of the wastewater treatment cabinet, and the bottom end of the column is rotatably connected to the shaft seat.

[0009] A further feature of this application is that a stirring rod located below the material tray is fixedly installed on the column, and the number of stirring rods is set to multiple and evenly distributed.

[0010] A further feature of this application is that a retaining ring is fixedly fitted on the outer wall of the drug outlet tube, and the retaining ring is located inside the drug delivery tube.

[0011] A further provision of this application is that the outer diameter of the retaining ring is smaller than the inner diameter of the drug delivery tube.

[0012] A further configuration of this application is as follows: the drug crushing assembly further includes a motor, a drive shaft, gear one, gear two, gear three, and an external gear ring. The motor is fixedly installed on the top of the sewage treatment tank, and the output shaft end of the motor extends into the sewage treatment tank. The drive shaft is fixedly installed on the output shaft end of the motor. Gear one is fixedly mounted on the drive shaft, gear two is fixedly mounted on the drug guide tube, and gear one meshes with gear two. Gear three is fixedly mounted on the bottom end of the drive shaft, and the external gear ring is fixedly mounted on the outer wall of the material distribution plate, and gear three meshes with the external gear ring.

[0013] A further configuration of this application is as follows: the diameter of gear one is the same as the diameter of gear two, the diameter of gear three is smaller than the diameter of gear two, and the diameter of the external gear ring is larger than the diameter of gear two.

[0014] A further feature of this application is that the top of the cartridge has a dosing hole, and a plug is threaded into the dosing hole.

[0015] This application includes at least one of the following beneficial technical effects: The dosing mechanism set up in this application can accurately measure the amount of chemicals to be added according to the actual needs of wastewater treatment, avoiding excessive or insufficient addition of chemicals, improving the wastewater treatment effect and chemical utilization rate, and reducing costs.

[0016] The dosing mechanism described in this application, when used to add granular drugs to wastewater, can effectively grind and crush the granular drugs into finer particles. These fine particles are then evenly and widely dispersed into the wastewater through multiple inclined holes on the dispersing disc, facilitating faster dissolution and enhancing wastewater treatment effectiveness and efficiency. When used to add liquid drugs to wastewater, the mechanism can mix the liquid drugs thoroughly, improving their concentration uniformity. The uniformly concentrated liquid drugs are then evenly and widely dispersed into the wastewater through multiple inclined holes, further enhancing wastewater treatment effectiveness and efficiency. Attached Figure Description

[0017] Figure 1 This is a front-view stereoscopic structural diagram of this embodiment.

[0018] Figure 2 This is a front view sectional three-dimensional structural schematic diagram of this embodiment.

[0019] Figure 3 This is a three-dimensional structural diagram of the dosing mechanism.

[0020] Figure 4 This is a partial cross-sectional three-dimensional structural diagram of the drug dispensing mechanism.

[0021] Figure 5 This is a three-dimensional structural diagram of the trumpet-shaped grinding base and the material distribution plate.

[0022] In the diagram: 1. Wastewater treatment cabinet; 2. Chemical cartridge; 3. Chemical outlet pipe; 4. Electromagnetic discharge valve; 5. Pad plate; 6. Weight sensor; 7. L-shaped bracket; 8. Ring seat; 9. Bearing; 10. Chemical guide tube; 11. Horn-shaped grinding cover; 12. Horn-shaped grinding seat; 13. Grinding protrusion one; 14. Grinding protrusion two; 15. Column; 16. Distributor plate; 17. Distributor inclined hole; 18. Shaft seat; 19. Stirring rod; 20. Retaining ring; 21. Motor; 22. Drive shaft; 23. Gear one; 24. Gear two; 25. Gear three; 26. External gear ring. Detailed Implementation

[0023] The technical solution of this application will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0024] See Figures 1-5 This application provides a precise metering wastewater treatment dosing device, including a wastewater treatment cabinet 1 and a dosing mechanism installed on the wastewater treatment cabinet 1. The dosing mechanism includes a dosing cartridge 2, a dispensing pipe 3, an electromagnetic discharge valve 4, a pad 5, a weight sensor 6, an L-shaped bracket 7, and a drug crushing assembly. The dosing cartridge 2 is located above the wastewater treatment cabinet 1. The dosing cartridge 2 can be used to hold granular drugs or liquid drugs for wastewater treatment. The dispensing pipe 3 is fixedly installed at the bottom center of the dosing cartridge 2. The electromagnetic discharge valve 4 is fixedly installed on the dispensing pipe 3. An clearance hole is provided at the top of the wastewater treatment cabinet 1, and the bottom end of the dispensing pipe 3 passes through the clearance hole. The pad 5 is fixedly installed on the top of the wastewater treatment cabinet 1. The weight sensor 6 is fixedly installed on the top of the pad 5. Using the weight sensor 6, the weight of the medicine in the cartridge 2 can be accurately weighed, so as to facilitate precise control of the dosage according to the actual needs of sewage treatment, avoid over- or under-dosing, improve the sewage treatment effect and drug utilization rate, and reduce costs. The weight sensor 6 is electrically connected to an external display through a wire. The weight value detected by the weight sensor 6 can be displayed on the external display for easy viewing by the staff. The external display can be installed on the sewage treatment cabinet 1 or on the L-shaped bracket 7. The L-shaped bracket 7 is fixedly installed on the top of the weight sensor 6. One end of the L-shaped bracket 7 is fixedly connected to the outer wall of the cartridge 2.

[0025] In this embodiment, the bottom inner wall of the medicine cartridge 2 has a centrally concave arc-shaped structure, which facilitates the concentrated flow of medicine to the medicine outlet pipe 3, ensuring that all the medicine in the medicine cartridge 2 can be discharged from the medicine outlet pipe 3. The inner diameter of the clearance hole is larger than the outer diameter of the medicine outlet pipe 3, so that the medicine outlet pipe 3 does not come into contact with the sewage treatment cabinet 1, ensuring the accuracy of weighing the medicine in the medicine cartridge 2.

[0026] In this embodiment, the drug crushing assembly includes an annular seat 8, a bearing 9, a drug guide tube 10, a trumpet-shaped grinding cover 11, a trumpet-shaped grinding seat 12, multiple grinding protrusions 13, multiple grinding protrusions 14, a column 15, a material distribution plate 16, and a shaft seat 18. The annular seat 8 is fixedly installed on the top inner wall of the wastewater treatment tank 1. The drug guide tube 10 is rotatably installed inside the annular seat 8 via the bearing 9. The bottom of the drug guide tube 10 extends outside the annular seat 8, and the bottom end of the drug outlet tube 3 extends into the drug guide tube 10. The grinding shroud 11 is fixedly installed at the bottom of the drug delivery tube 10. The trumpet-shaped grinding seat 12 is located inside the trumpet-shaped grinding shroud 11. Multiple abrasive protrusions 13 are fixedly installed on the inner side wall of the trumpet-shaped grinding shroud 11 and are evenly distributed. Multiple abrasive protrusions 14 are fixedly installed on the outer side wall of the trumpet-shaped grinding seat 12 and are evenly distributed. The multiple abrasive protrusions 13 and multiple abrasive protrusions 14 are arranged in an alternating pattern. The trumpet-shaped grinding shroud 11 and the trumpet-shaped grinding seat 12 cooperate with each other, and the alternating pattern is utilized. Grinding protrusions 13 and 14 effectively grind and break down the passing granular drugs into finer particles, accelerating their dissolution in wastewater, improving drug reaction efficiency, and enhancing wastewater treatment effectiveness and efficiency. A column 15 is fixedly installed at the bottom of a trumpet-shaped grinding base 12, with its bottom end extending outside the trumpet-shaped grinding cover 11. A material distribution plate 16 is fixedly mounted on the column 15, with its upper surface slidingly contacting the bottom surface of the trumpet-shaped grinding cover 11. The material distribution plate 16 has multiple evenly distributed inclined holes 17. A shaft seat 18 is fixedly installed on the bottom inner wall of the wastewater treatment cabinet 1, with the bottom end of the column 15 rotatably connected to the shaft seat 18. Utilizing the multiple inclined holes 17 on the material distribution plate 16, the ground and broken drugs can be more evenly and extensively dispersed into the wastewater, avoiding excessively high or low local concentrations of drugs added to the wastewater, improving the uniformity and stability of wastewater treatment, and further enhancing the wastewater treatment effect and efficiency.

[0027] In this embodiment, a stirring rod 19 is fixedly installed on the column 15 below the material tray 16. The number of stirring rods 19 is set to multiple and evenly distributed. The design of the stirring rods 19 is to further stir the sewage and promote the full mixing of the drug and the sewage.

[0028] In this embodiment, a retaining ring 20 is fixedly fitted on the outer wall of the drug outlet tube 3. The retaining ring 20 is located inside the drug guide tube 10 and is used to prevent the drug discharged from the drug outlet tube 3 from splashing upwards.

[0029] In this embodiment, the outer diameter of the retaining ring 20 is smaller than the inner diameter of the drug delivery tube 10, which prevents the retaining ring 20 from contacting the drug delivery tube 10 and further ensures the accuracy of weighing the drug in the dispensing cylinder 2. It should be noted that the gap between the retaining ring 20 and the drug delivery tube 10 is set to 1mm-2mm.

[0030] In this embodiment, the drug crushing assembly further includes a motor 21, a drive shaft 22, a first gear 23, a second gear 24, a third gear 25, and an external gear ring 26. The motor 21 is fixedly mounted on the top of the wastewater treatment tank 1, with its output shaft extending into the wastewater treatment tank 1. The drive shaft 22 is fixedly mounted on the output shaft of the motor 21. The first gear 23 is fixedly fitted onto the drive shaft 22, and the second gear 24 is fixedly fitted onto the drug guide tube 10. The first gear 23 meshes with the second gear 24, and the third gear 25 is fixedly fitted onto the drive shaft 22. At the bottom, the outer gear ring 26 is fixedly fitted on the outer wall of the material distribution tray 16. The third gear 25 meshes with the outer gear ring 26. The motor 21 drives the first gear 23 and the third gear 25 to rotate through the drive shaft 22. In turn, the first gear 23 drives the second gear 24 that meshes with it to rotate the drug guide tube 10 and the trumpet-shaped grinding cover 11. At the same time, the third gear 25 drives the outer gear ring 26 to rotate the column 15, the trumpet-shaped grinding seat 12 and the material distribution tray 16, realizing the automated operation of a series of actions of drug grinding and dispersion, reducing manual operation and improving work efficiency.

[0031] In this embodiment, the diameter of gear 1 23 is the same as that of gear 24, the diameter of gear 3 25 is smaller than that of gear 24, and the diameter of the outer gear ring 26 is larger than that of gear 24, ensuring that the horn-shaped grinding cover 11 and the horn-shaped grinding seat 12 have a reasonable speed difference, thereby achieving efficient grinding of granular drugs.

[0032] In this embodiment, the top of the medicine cartridge 2 is provided with a medicine addition hole, and a stopcock is installed in the internal thread of the medicine addition hole, so that the staff can open the stopcock to add medicine into the medicine cartridge 2.

[0033] With the above structure, the precise metering sewage treatment dosing device provided in this application allows the operator to unscrew the stopcock in the dosing hole at the top of the dosing cylinder 2 and pour the medicine into the cylinder 2. The weight sensor 6 can detect and weigh the medicine inside the cylinder 2 in real time and transmit the data to an external display via a wire. The operator can read the medicine weight directly from the display and pour the required weight of medicine into the cylinder 2 according to the actual needs of sewage treatment. This allows for precise control of the amount of medicine added during sewage treatment, avoiding over- or under-dosing, improving the sewage treatment effect and medicine utilization rate, and reducing costs. After the required weight of medicine is poured into the medicine cylinder 2, the electromagnetic discharge valve 4 is opened, and the medicine falls from the medicine outlet pipe 3 and enters the medicine guide pipe 10. At the same time, the control motor 21 is started, and its output shaft drives the drive shaft 22 to rotate. The gear 1 23 and gear 3 25 fixed on the drive shaft 22 rotate accordingly. Since gear 1 23 meshes with gear 2 24, gear 2 24 drives the medicine guide pipe 10 and the trumpet-shaped grinding cover 11 to rotate. Since gear 3 25 meshes with the outer gear ring 26, the outer gear ring 26 drives the material distribution plate 16, the column 15 and the trumpet-shaped grinding seat 12 to rotate. Since the diameter of gear 1 23 and the diameter of gear 2 24 are the same, the diameter of gear 3 25 is smaller than the diameter of gear 2 24, and the diameter of the outer gear ring 26 is larger than the diameter of gear 2 24, the trumpet-shaped grinding cover 11 and the trumpet-shaped grinding seat 12 will have a certain speed difference. If the drug added to the wastewater is granular, the granular drug from the outlet pipe 3 enters the gap between the trumpet-shaped grinding hood 11 and the trumpet-shaped grinding seat 12. By utilizing the rotation of the trumpet-shaped grinding hood 11 and the trumpet-shaped grinding seat 12, and with the synergistic action of multiple grinding protrusions 13 and 14, the granular drug can be effectively ground and crushed into finer particles. The fine particles after grinding and crushing continue to fall onto the distribution plate 16. Under the centrifugal force generated by the rotation of the distribution plate 16, the fine particles can be evenly and extensively dispersed into the wastewater through multiple distribution inclined holes 17 on the distribution plate 16, so as to dissolve in the wastewater more quickly and enhance the wastewater treatment effect and efficiency. During the rotation of the column 15, multiple stirring rods 19 will rotate with the column 15 to stir the wastewater, promote the full mixing of fine particles and wastewater, ensure the uniformity and stability of wastewater treatment, and further enhance the wastewater treatment effect and efficiency. If the drug added to the sewage is a liquid drug, the liquid drug coming out of the drug outlet pipe 3 enters the gap between the trumpet-shaped grinding hood 11 and the trumpet-shaped grinding seat 12. By utilizing the rotation of the trumpet-shaped grinding hood 11 and the trumpet-shaped grinding seat 12, and with the synergistic action of multiple grinding protrusions 13 and multiple grinding protrusions 14, the liquid drug can be mixed evenly, improving the concentration uniformity of the liquid drug. Then, under the centrifugal force generated by the rotation of the distribution plate 16, the liquid drug with uniform concentration can be evenly and widely dispersed from multiple distribution inclined holes 17 into the sewage, which can enhance the sewage treatment effect and efficiency. By utilizing multiple stirring rods 19 to rotate together with the column 15, the sewage can be stirred, promoting the full mixing of the liquid drug and the sewage, ensuring the uniformity and stability of sewage treatment, and further enhancing the sewage treatment effect and efficiency. After the dosing is completed, stop the motor 21, close the electromagnetic discharge valve 4, and disconnect the power supply to the weight sensor 6.

Claims

1. A precise metering wastewater treatment dosing device, characterized in that, The system includes a wastewater treatment cabinet (1) and a dosing mechanism installed on the wastewater treatment cabinet (1). The dosing mechanism includes a dosing cartridge (2), a dosing pipe (3), an electromagnetic discharge valve (4), a pad (5), a weight sensor (6), an L-shaped bracket (7), and a drug crushing assembly. The dosing cartridge (2) is located above the wastewater treatment cabinet (1). The dosing pipe (3) is fixedly installed at the bottom center of the dosing cartridge (2). The electromagnetic discharge valve (4) is fixedly installed on the dosing pipe (3). The top of the wastewater treatment cabinet (1) has an clearance hole. The bottom end of the dosing pipe (3) passes through the clearance hole. The pad (5) is fixedly installed on the top of the wastewater treatment cabinet (1). The weight sensor (6) is fixedly installed on the top of the pad (5). The L-shaped bracket (7) is fixedly installed on the top of the weight sensor (6). One end of the L-shaped bracket (7) is fixedly connected to the outer wall of the dosing cartridge (2).

2. The precise metering wastewater treatment dosing device according to claim 1, characterized in that: The bottom inner wall of the cartridge (2) is a concave arc-shaped surface structure, and the inner diameter of the clearance hole is larger than the outer diameter of the outlet tube (3).

3. The precise metering wastewater treatment dosing device according to claim 1, characterized in that: The drug crushing assembly includes an annular seat (8), a bearing (9), a drug delivery tube (10), a trumpet-shaped grinding shroud (11), a trumpet-shaped grinding seat (12), multiple grinding protrusions (13), multiple grinding protrusions (14), a column (15), a material distribution plate (16), and a shaft seat (18). The annular seat (8) is fixedly installed on the top inner wall of the wastewater treatment tank (1). The drug delivery tube (10) is rotatably installed inside the annular seat (8) via the bearing (9). The bottom of the drug delivery tube (10) extends outside the annular seat (8), and the bottom end of the drug outlet tube (3) extends inside the drug delivery tube (10). The trumpet-shaped grinding shroud (11) is fixedly installed at the bottom of the drug delivery tube (10). The trumpet-shaped grinding seat (12) is located inside the trumpet-shaped grinding shroud (11). Multiple grinding protrusions (13) are all fixedly installed on the trumpet-shaped grinding shroud. The inner wall of the cover (11) is uniformly distributed, and multiple grinding protrusions (14) are fixedly installed on the outer wall of the horn-shaped grinding seat (12) and are uniformly distributed. Multiple grinding protrusions (13) and multiple grinding protrusions (14) are arranged in an alternating manner. The column (15) is fixedly installed at the bottom of the horn-shaped grinding seat (12). The bottom end of the column (15) extends to the outside of the horn-shaped grinding cover (11). The material distribution plate (16) is fixedly fitted on the column (15). The upper surface of the material distribution plate (16) slides in contact with the bottom surface of the horn-shaped grinding cover (11). Multiple uniformly distributed material distribution oblique holes (17) are opened on the material distribution plate (16). The shaft seat (18) is fixedly installed on the bottom inner wall of the sewage treatment cabinet (1). The bottom end of the column (15) is rotatably connected to the shaft seat (18).

4. The precise metering wastewater treatment dosing device according to claim 3, characterized in that: A stirring rod (19) is fixedly installed on the column (15) below the material tray (16), and the number of stirring rods (19) is set to multiple and evenly distributed.

5. The precise metering wastewater treatment dosing device according to claim 3, characterized in that: A retaining ring (20) is fixedly fitted on the outer wall of the drug outlet tube (3), and the retaining ring (20) is located inside the drug delivery tube (10).

6. The precise metering wastewater treatment dosing device according to claim 5, characterized in that: The outer diameter of the retaining ring (20) is smaller than the inner diameter of the drug delivery tube (10).

7. The precise metering wastewater treatment dosing device according to claim 3, characterized in that: The drug crushing assembly also includes a motor (21), a drive shaft (22), a first gear (23), a second gear (24), a third gear (25), and an external gear ring (26). The motor (21) is fixedly installed on the top of the sewage treatment tank (1), and the output shaft end of the motor (21) extends into the sewage treatment tank (1). The drive shaft (22) is fixedly installed on the output shaft end of the motor (21). The first gear (23) is fixedly mounted on the drive shaft (22). The second gear (24) is fixedly mounted on the drug guide tube (10). The first gear (23) meshes with the second gear (24). The third gear (25) is fixedly mounted on the bottom end of the drive shaft (22). The external gear ring (26) is fixedly mounted on the outer wall of the material distribution plate (16). The third gear (25) meshes with the external gear ring (26).

8. The precise metering wastewater treatment dosing device according to claim 7, characterized in that: The diameter of gear one (23) is the same as that of gear two (24), the diameter of gear three (25) is smaller than that of gear two (24), and the diameter of the external gear ring (26) is larger than that of gear two (24).

9. The precise metering wastewater treatment dosing device according to claim 1, characterized in that: The top of the cartridge (2) is provided with a dosing hole, and a plug is installed in the dosing hole by an internal thread.

Images