Dosing device for sewage treatment

Abstract

The utility model relates to the field of sewage treatment, in particular to a dosing device for sewage treatment, which is characterized in that a base is provided with an inner cavity, and a moving part is in sliding fit in the inner cavity. And the dosing pipe is connected to the bottom end of the base. The matching ring is rotatably arranged on the base in a sleeving mode, and the outer side wall of the matching ring is provided with a protruding part. The reference shaft is arranged in the tangential direction of the matching ring. The abutting arm, the pressing arm and the stirring arm are all installed on the reference shaft, the abutting arm extends to the matching ring, the pressing arm extends to the side, away from the medicine adding pipe, of the moving part, and the stirring arm extends to the medicine adding assembly. And the dosing component is communicated with the dosing pipe. The driver is used for driving the matching ring to rotate, so that the protruding part pushes the abutting arm, the stirring arm triggers the medicine adding assembly to feed a medicine solution into the medicine adding pipe, the pressing arm pushes the moving part to move towards the end where the medicine adding pipe is located, and therefore the medicine solution in the medicine adding pipe is fully blown out through airflow. According to the coagulant aid solution adding device, the solution loss during coagulant aid solution adding can be effectively reduced, and the adding precision of the coagulant aid solution is improved.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to a dosing device for sewage treatment. Background Art

[0002] Coagulants are often used in sewage treatment processes and are typically added in the form of aqueous solutions. In existing technologies, this often results in losses during the addition of aqueous solutions, resulting in the actual amount of coagulant added to the sewage being less than the intended amount, which, to some extent, impacts the actual treatment effect.

[0003] In view of this, this application is hereby filed. Utility Model Content

[0004] The purpose of the utility model is to provide a dosing device for sewage treatment, which has a simple structure and can effectively reduce the solution loss when adding coagulant aid solution, improve the addition accuracy of coagulant aid solution, reduce the loss of coagulant aid solution, and ensure the sewage treatment effect.

[0005] The embodiment of the present utility model is achieved as follows:

[0006] A dosing device for sewage treatment comprises a base, a matching ring, an action mechanism, a dosing pipe and a driver.

[0007] The base is cylindrical, with its central axis arranged vertically. The base has an inner cavity extending axially therefrom, extending through the top end surface of the base. A moving member slidably engages within the inner cavity, forming a sliding seal between the moving member and the inner wall of the inner cavity. A first elastic member abuts the moving member against the bottom end of the inner cavity.

[0008] The dosing tube is connected to the bottom end of the base and communicates with the inner cavity, and the central axis of the dosing tube is arranged along the vertical direction.

[0009] The matching ring is rotatably sleeved on the base. The outer side wall of the matching ring has a protrusion. Along the circumference of the matching ring, from one end of the protrusion toward the other end, the protrusion height increases.

[0010] The actuating mechanism includes a reference shaft, an abutting arm, a pressing arm, a toggle arm, and a dosing assembly. The reference shaft is arranged tangentially to the mating ring and spaced apart from it. The abutting arm, pressing arm, and toggle arm are all mounted on the reference shaft. The abutting arm extends to the mating ring, the pressing arm extends to the side of the moving part away from the dosing tube, and the toggle arm extends to the dosing assembly. The dosing assembly is connected to the dosing tube.

[0011] The reference shaft is equipped with a second elastic member to cause the abutment arm to abut against the outer wall of the mating ring. The driver is used to drive the mating ring to rotate, causing the protrusion to push the abutment arm, thereby causing the toggle arm to trigger the dosing assembly to deliver the pharmaceutical solution into the dosing tube. The pressing arm pushes the moving member toward the end where the dosing tube is located, thereby using airflow to fully blow out the pharmaceutical solution in the dosing tube.

[0012] Furthermore, the action mechanisms are multiple groups, and the multiple groups of action mechanisms are evenly spaced along the circumference of the base.

[0013] Furthermore, the dosing assembly includes: a push rod, a matching sleeve, a connecting pipe and a medicine storage box.

[0014] The push rod and the matching sleeve are both arc-shaped. The push rod can be slidably matched with the matching sleeve and a sliding seal is formed between the two. The push rod is fixedly connected to the toggle arm. The push rod and the matching sleeve are both arranged along the circumference of the reference axis.

[0015] The push rod is provided with a guide hole on one end surface away from the matching sleeve, and the guide hole extends toward the other end of the push rod. The push rod is provided with a communication port for connecting the guide hole and the matching sleeve on one end surface close to the matching sleeve, and the communication port is matched with a first one-way valve.

[0016] One end of the matching sleeve away from the push rod is connected to the dosing pipe by a connecting pipe.

[0017] Furthermore, the toggle arm is hinged to the reference shaft, and the toggle arm is equipped with a second elastic member, which is used to apply a force to the toggle arm to move the push rod toward the matching sleeve.

[0018] The mating ring has a first rotational stop point, a second rotational stop point, and a third rotational stop point.

[0019] When the matching ring is located at the first rotation stop point, the abutting arm is in contact with the outer side wall of the matching ring, and a gap exists between the pressing arm and the moving part.

[0020] When the matching ring is located at the second rotation stop point, the abutment arm fits against the middle of the raised portion, the pressing arm fits against the moving part, the push rod fits against one end of the matching sleeve close to the connecting pipe, and the pharmaceutical solution is fed into the dosing pipe.

[0021] When the mating ring is located at the third rotation stop point, the abutment arm is in contact with the end of the raised portion with the largest raised height, the toggle arm overcomes the elastic force of the second elastic member and rotates relative to the reference axis, and the pressing arm pushes the moving member into the inner cavity, thereby utilizing the airflow to fully blow out the pharmaceutical solution in the dosing tube.

[0022] Furthermore, the moving part is provided with an air hole, which runs from a side surface of the moving part away from the dosing tube to a side surface of the moving part close to the dosing tube, and the air hole is matched with a second one-way valve.

[0023] Furthermore, the ends of the abutting arm and the pressing arm are both fixedly connected with matching balls, and the surfaces of the matching balls are smoothed.

[0024] Furthermore, a transition section is connected between the dosing tube and the base, and the inner diameter of the transition section decreases in the direction from the base to the dosing tube.

[0025] The beneficial effects of the technical solution of the embodiment of the utility model include:

[0026] During use of the dosing device for sewage treatment provided by the embodiment of the utility model, the protrusion pushes the abutment arm, and the reference shaft rotates, so that the toggle arm triggers the dosing assembly to send the pharmaceutical solution into the dosing tube, and at the same time the pressing arm pushes the moving part toward the inside of the base, and the moving part moves in the inner cavity toward the end where the dosing tube is located, and the moving part pushes the gas in the inner cavity into the dosing tube, thereby utilizing the airflow to fully blow out the pharmaceutical solution in the dosing tube, reducing the residual pharmaceutical solution in the dosing tube during the dosing process, effectively reducing the solution loss when adding the coagulant aid solution, improving the addition accuracy of the coagulant aid solution, reducing the loss of the coagulant aid solution, and ensuring the sewage treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of the overall structure of the dosing device provided in an embodiment of the present utility model (the mating ring is at the first rotation stop point);

[0029] Figure 2 Schematic diagram of the matching ring and the base;

[0030] Figure 3 Schematic diagram of the cooperation between the push rod and the matching sleeve;

[0031] Figure 4 Schematic diagram of the structure of the push rod;

[0032] Figure 5 A schematic diagram of the overall structure of the dosing device provided in an embodiment of the present utility model (the mating ring is at the second rotation stop point);

[0033] Figure 6 This is a schematic diagram of the overall structure of the dosing device provided in an embodiment of the utility model (the matching ring is at the third rotation stop point).

[0034] Description of reference numerals:

[0035] Base 100; inner cavity 110; moving part 120; air hole 121; mating ring 200; protrusion 210; reference shaft 300; abutment arm 310; pressing arm 320; toggle arm 330; push rod 340; guide hole 341; connecting port 342; first one-way valve 343; mating sleeve 350; connecting tube 360; dosing tube 400; mating ball 500; transition section 600. DETAILED DESCRIPTION

[0036] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0039] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0040] Furthermore, the terms "parallel" and "perpendicular" do not necessarily mean that the components must be absolutely parallel or perpendicular, but rather that they can be slightly tilted. For example, "parallel" simply means that the direction is more parallel than "perpendicular," not that the structure must be completely parallel, but rather that it can be slightly tilted.

[0041] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0042] In order to overcome the shortcomings of the existing technology, please refer to Figure 1-Figure 4 This embodiment provides a dosing device for sewage treatment, which includes: a frame (not shown in the figure), a base 100, a matching ring 200, an action mechanism, a dosing tube 400 and a driver (not shown in the figure).

[0043] The base 100 is fixedly mounted on the frame. The base 100 is cylindrical, and the central axis of the base 100 is arranged along the vertical direction.

[0044] The base 100 has an inner cavity 110 extending axially therefrom, extending through the top end surface of the base 100. A moving member 120 slidably fits within the inner cavity 110, forming a sliding seal with the inner wall of the inner cavity 110. A first elastic member (not shown) abuts the bottom end of the moving member 120 against the inner cavity 110. In its natural state, under the elastic force of the first elastic member, the moving member 120 partially protrudes beyond the top end of the base 100. The base 100 includes an anti-drop mechanism (not shown) to prevent the moving member 120 from being completely pushed out by the first elastic member.

[0045] The dosing tube 400 is connected to the bottom end of the base 100 and communicates with the inner cavity 110 of the base 100. The central axis of the dosing tube 400 is arranged in the vertical direction. The dosing tube 400 is used to add a pharmaceutical solution to the sewage.

[0046] The mating ring 200 is rotatably mounted on the base 100, with its rotational axis coinciding with the central axis of the base 100. The outer wall of the mating ring 200 has a raised portion 210, formed by radially protruding from the outer wall of the mating ring 200. The height of the raised portion 210 increases progressively along the circumference of the mating ring 200, from one end toward the other.

[0047] The action mechanism includes: a reference shaft 300, an abutting arm 310, a pressing arm 320, a toggle arm 330 and a drug adding assembly.

[0048] The reference shaft 300 is disposed along a tangential direction of the mating ring 200 and spaced apart from the mating ring 200 . The reference shaft 300 is rotatably mounted on the frame.

[0049] The abutting arm 310 , the pressing arm 320 and the toggle arm 330 are all arranged along the radial direction of the reference shaft 300 and mounted on the reference shaft 300 , and the abutting arm 310 , the pressing arm 320 and the toggle arm 330 are spaced apart from each other. Both the abutting arm 310 and the pressing arm 320 are fixedly connected to the reference shaft 300 .

[0050] The abutting arm 310 extends to the matching ring 200 , the pressing arm 320 extends to a side of the moving part 120 away from the dosing tube 400 , and the toggle arm 330 extends to the dosing assembly.

[0051] The dosing assembly is in communication with the dosing pipe 400 .

[0052] The reference shaft 300 is equipped with a second elastic member (not shown in the figure), which is used to continuously provide driving force for the reference shaft 300 so that the reference shaft 300 can move along the Figure 1 The abutting arm 310 is rotated in the P direction shown in FIG. 1 , so that the abutting arm 310 can always abut against the outer side wall of the matching ring 200 .

[0053] The driver is used to drive the mating ring 200 to rotate, for example Figure 2 The mating ring 200 is driven in the K direction shown in FIG, so that the abutting arm 310 can shift from being in contact with the outer wall of the mating ring 200 to being in contact with the end of the protrusion 210 with the lowest protrusion height. As the mating ring 200 continues to rotate, the abutting arm 310 can move along the protrusion 210 and eventually be in contact with the end of the protrusion 210 with the greatest protrusion height. During this process, the abutting arm 310 is gradually pushed by the protrusion 210 toward the side away from the mating ring 200, and the pushing distance gradually increases. In this way, the reference shaft 300 is driven by the abutting arm 310 to rotate in the direction opposite to the P direction. During this process, the reference shaft 300 overcomes the elastic force of the second elastic member to rotate.

[0054] Through this design, the protrusion 210 pushes the abutment arm 310, and the reference shaft 300 rotates, so that the toggle arm 330 triggers the dosing assembly to send the pharmaceutical solution into the dosing tube 400, and at the same time, the pressing arm 320 pushes the moving part 120 toward the inside of the base 100, and the moving part 120 moves in the inner cavity 110 toward the end where the dosing tube 400 is located. The moving part 120 pushes the gas in the inner cavity 110 into the dosing tube 400, thereby utilizing the airflow to fully blow out the pharmaceutical solution in the dosing tube 400, reducing the residual pharmaceutical solution in the dosing tube 400 during the dosing process, effectively reducing the solution loss when adding the coagulant aid solution, improving the addition accuracy of the coagulant aid solution, reducing the loss of the coagulant aid solution, and ensuring the sewage treatment effect.

[0055] It should be noted that when the driver drives the mating ring 200, a dosing operation is completed after the abutment arm 310 is in contact with the end of the protrusion 210 with the greatest protrusion height. During the actual dosing process, the amount of the drug solution added in a single time can be flexibly set according to actual needs, and the number of dosing times can be controlled based on the actual demand for the drug solution.

[0056] When multiple dosing operations are required, the driver can be used to drive the mating ring 200 to rotate continuously in the K direction, so that the protrusion 210 repeatedly pushes the abutting arm 310 to achieve multiple dosing operations. Alternatively, after the abutting arm 310 is in contact with the end of the protrusion 210 with the largest protrusion height, the driver can be used to drive the mating ring 200 to rotate in the opposite direction (i.e., in the direction opposite to the K direction), so that the abutting arm 310 moves along the protrusion 210 toward the end of the protrusion 210 with the smallest protrusion height, and finally the abutting arm 310 is re-engaged with the outer wall of the mating ring 200 to achieve reset. The driver can then be used to drive the mating ring 200 to move in the K direction again for the next dosing operation. This repetition can be repeated to achieve repeated dosing operations. In actual use, the method of driving the mating ring 200 by the driver can be flexibly selected according to actual needs, and this application does not impose any specific restrictions.

[0057] Optionally, the action mechanisms may be provided in multiple groups, and the multiple groups of action mechanisms are evenly spaced along the circumference of the base 100 , and each group of action mechanisms is correspondingly provided with a protrusion 210 .

[0058] In this embodiment, the medicine adding assembly includes: a push rod 340, a matching sleeve 350, a connecting pipe 360 ​​and a medicine storage box (not shown in the figure).

[0059] The medicine storage box is used to store the prepared medicine solution.

[0060] Both the push rod 340 and the mating sleeve 350 are arc-shaped. The push rod 340 slidably engages with the mating sleeve 350, creating a sliding seal between the push rod 340 and the mating sleeve 350. The mating sleeve 350 is fixedly mounted to the frame. The push rod 340 is fixedly connected to the toggle arm 330, and both the push rod 340 and the mating sleeve 350 are arranged along the circumference of the reference axis 300.

[0061] The push rod 340 has a guide hole 341 on one end thereof away from the mating sleeve 350, and the guide hole 341 extends toward the other end of the push rod 340. The push rod 340 has a communication port 342 on one end thereof close to the mating sleeve 350, which connects the guide hole 341 with the mating sleeve 350. The communication port 342 is equipped with a first one-way valve 343.

[0062] The inner diameter of the end of the mating sleeve 350 away from the push rod 340 is smaller than the outer diameter of the push rod 340. The end of the mating sleeve 350 away from the push rod 340 is connected to the dosing tube 400 by a connecting tube 360. The end of the push rod 340 away from the mating sleeve 350 connects the medicine storage box with the guide hole 341 through a connecting tube (not shown in the figure), so that the medicine storage box can continuously supply medicine.

[0063] When the push rod 340 moves into the mating sleeve 350, the first one-way valve 343 is closed, allowing the push rod 340 to push the pharmaceutical solution in the mating sleeve 350 into the connecting tube 360, thereby allowing the connecting tube 360 ​​to deliver the pharmaceutical solution to the dosing tube 400. When the push rod 340 moves out of the mating sleeve 350, the first one-way valve 343 is open, allowing the pharmaceutical solution in the guide hole 341 of the push rod 340 to enter the mating sleeve 350. When the push rod 340 reciprocates along the mating sleeve 350, it can continuously deliver the pharmaceutical solution from the medicine storage tank to the dosing tube 400. During each delivery, the moving member 120 can fully blow out the pharmaceutical solution in the dosing tube 400.

[0064] Specifically, one end of the toggle arm 330 away from the push rod 340 is hinged to the reference shaft 300, and the rotation axis centerline of the toggle arm 330 relative to the reference shaft 300 is arranged to coincide with the rotation axis centerline of the reference shaft 300. The toggle arm 330 is equipped with a second elastic member (not shown in the figure). The second elastic member is used to apply a force to the toggle arm 330 to make the push rod 340 move toward the mating sleeve 350. That is to say, the second elastic member is used to drive the toggle arm 330 to rotate relative to the reference shaft 300 in a direction opposite to the P direction.

[0065] In the natural state, under the action of the second elastic member, the toggle arm 330 rotates relative to the reference shaft 300 in a direction opposite to the P direction until it becomes perpendicular to the abutting arm 310. At this point, the toggle arm 330 reaches a stop point and cannot further move relative to the reference shaft 300 in a direction opposite to the P direction. In this state, the toggle arm 330 is in the initial state.

[0066] The mating ring 200 has a first rotational stop point, a second rotational stop point, and a third rotational stop point.

[0067] When the matching ring 200 is at the first rotation stop point, the abutting arm 310 is attached to the outer wall of the matching ring 200, the abutting arm 310 is not in contact with the protrusion 210, and there is a gap between the pressing arm 320 and the moving part 120. Figure 1 shown.

[0068] As the mating ring 200 rotates along the K direction, the protrusion 210 contacts the ground connection portion. When the mating ring 200 is at the second rotation stop point, the abutment arm 310 fits in the middle of the protrusion 210. During this process, the abutment arm 310 is pushed a distance toward the side away from the mating ring 200. The pressing arm 320 approaches the moving part 120 and fits in exactly with the side of the moving part 120 away from the dosing tube 400. The push rod 340 is also driven by the toggle arm 330. The push rod 340 moves into the mating sleeve 350 and moves to the end of the mating sleeve 350 close to the connecting tube 360. The push rod 340 fits in exactly with the end of the mating sleeve 350 close to the connecting tube 360 ​​(the force provided by the second elastic member is greater than the thrust required for the push rod 340 to push the drug solution). The drug solution is fed into the dosing tube 400. Figure 5 shown.

[0069] As the mating ring 200 rotates in the K direction, when the mating ring 200 is located at the third rotation stop point, the abutment arm 310 is fitted to the end of the protrusion 210 with the largest protrusion height. During this process, the abutment arm 310 is pushed further away from the mating ring 200. Since the push rod 340 has already fitted to the end of the mating sleeve 350 close to the connecting tube 360, the push rod 340 cannot move further into the mating sleeve 350. When the reference shaft 300 continues to rotate, the push rod 340 limits the movement of the toggle arm 330. Therefore, the toggle arm 330 overcomes the elastic force of the second elastic member and moves in the P direction relative to the reference shaft 300. The distance between the toggle arm 330 and the abutment arm 310 becomes smaller. At the same time, the pressing arm 320 pushes the moving part 120 into the inner cavity 110, and the moving part 120 uses the airflow to fully blow out the drug solution in the dosing tube 400. Figure 6 shown.

[0070] Through the above design, it is achieved that the pharmaceutical solution is first added to the dosing tube 400 and then the pharmaceutical solution is blown out by air flow, thereby ensuring the adequacy of the discharge of the pharmaceutical solution.

[0071] In this embodiment, the moving member 120 defines an air hole 121 extending from the side of the moving member 120 facing away from the dosing tube 400 to the side of the moving member 120 facing the dosing tube 400. The air hole 121 is equipped with a second one-way valve (not shown). When the moving member 120 moves into the inner cavity 110, the second one-way valve closes and seals the air hole 121. When the moving member 120 moves out of the inner cavity 110, the second one-way valve opens, opening the air hole 121 and allowing external air to enter the inner cavity 110.

[0072] The ends of the abutting arm 310 and the pressing arm 320 are both fixedly connected with a matching ball 500 , and the surface of the matching ball 500 is smoothed to reduce mechanical wear of the matching ring 200 and the moving part 120 .

[0073] A transition section 600 is connected between the dosing tube 400 and the base 100, connecting the inner cavity 110 and the dosing tube 400. The inner diameter of the transition section 600 decreases in the direction from the base 100 toward the dosing tube 400. The inner diameter of the upper end of the transition section 600 matches the inner diameter of the inner cavity 110, while the inner diameter of the lower end of the transition section 600 matches the diameter of the dosing tube 400.

[0074] The beneficial effects of the dosing device for sewage treatment provided by the embodiment of the utility model include but are not limited to:

[0075] (1) Compared with the traditional method of delivering liquid medicine through pipelines, the use of air flow reduces the residual amount of medicine in the dosing pipe 400, improves the dosing accuracy, and reduces the loss of medicine.

[0076] (2) The power source is simplified. A single power source can be used to achieve coordinated movements of various moving parts, while reducing the difficulty of coordinated movements between various moving parts.

[0077] (3) When adding the reagent, air bubbles are injected into the sewage system through the dosing pipe 400. The air bubbles can effectively promote the diffusion of the reagent in the sewage system and promote the flocculation and sedimentation of impurity particles.

[0078] (4) The injection position of the bubbles is the same as the addition position of the reagent, so that the cheongsam can more effectively assist the dispersion of the reagent in the sewage system.

[0079] (5) The airflow intensity in the dosing tube 400 can be adjusted by adjusting the inner diameter ratio of the inner cavity 110 and the dosing tube 400.

[0080] To sum up, the dosing device for sewage treatment provided by the embodiment of the utility model has a simple structure, can effectively reduce the solution loss when adding the coagulant aid solution, improves the addition accuracy of the coagulant aid solution, reduces the loss of the coagulant aid solution, and ensures the sewage treatment effect.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A dosing device for sewage treatment, characterized in that: include: Base, mating ring, action mechanism, dosing tube and driver; The base is cylindrical, with a central axis arranged in a vertical direction; the base has an inner cavity extending along its axial direction, the inner cavity penetrating to the top end surface of the base; a moving part is slidably fitted in the inner cavity, the moving part is slidably sealed against the inner wall of the inner cavity, and a first elastic part abuts against the bottom end of the inner cavity; The dosing tube is connected to the bottom end of the base and communicates with the inner cavity, and the central axis of the dosing tube is arranged in the vertical direction; The mating ring is rotatably sleeved on the base, and the outer wall of the mating ring has a protrusion. Along the circumference of the mating ring, the protrusion height increases from one end of the protrusion toward the other end thereof; The actuating mechanism includes: a reference shaft, an abutting arm, a pressing arm, a toggle arm, and a dosing assembly; the reference shaft is arranged along the tangent direction of the mating ring and spaced apart from the mating ring; the abutting arm, the pressing arm, and the toggle arm are all mounted on the reference shaft, the abutting arm extends to the mating ring, the pressing arm extends to the side of the moving part away from the dosing tube, and the toggle arm extends to the dosing assembly; the dosing assembly is in communication with the dosing tube; The reference shaft is equipped with a second elastic member so that the abutment arm abuts against the outer wall of the mating ring; the driver is used to drive the mating ring to rotate so that the protrusion pushes the abutment arm, thereby causing the toggle arm to trigger the dosing assembly to deliver the pharmaceutical solution into the dosing tube, and the pressing arm pushes the moving part to move toward the end where the dosing tube is located, thereby utilizing the airflow to fully blow out the pharmaceutical solution in the dosing tube.

2. The dosing device for sewage treatment according to claim 1, characterized in that: There are multiple groups of action mechanisms, and the multiple groups of action mechanisms are evenly spaced along the circumference of the base.

3. The dosing device for sewage treatment according to claim 1, characterized in that: The dosing assembly includes: a push rod, a matching sleeve, a connecting pipe and a medicine storage box; The push rod and the matching sleeve are both arc-shaped; the push rod is slidably matched with the matching sleeve and a sliding seal is formed between the two; the push rod is fixedly connected to the toggle arm; and the push rod and the matching sleeve are both arranged along the circumference of the reference axis; A guide hole is formed on one end surface of the push rod away from the matching sleeve, and the guide hole extends toward the other end of the push rod; a communication port is formed on one end surface of the push rod close to the matching sleeve to connect the guide hole and the matching sleeve, and the communication port is equipped with a first one-way valve; One end of the matching sleeve away from the push rod is connected to the dosing tube by the connecting tube.

4. The dosing device for sewage treatment according to claim 3, characterized in that: The toggle arm is hinged to the reference shaft, and the toggle arm is equipped with a second elastic member, and the second elastic member is used to apply a force to the toggle arm to move the push rod toward the matching sleeve; The mating ring has a first rotation stop point, a second rotation stop point and a third rotation stop point; When the matching ring is located at the first rotation stop point, the abutting arm is in contact with the outer wall of the matching ring, and a gap is formed between the pressing arm and the moving part; When the matching ring is located at the second rotation stop point, the abutting arm is in contact with the middle of the raised portion, the pressing arm is in contact with the moving part, the push rod is in contact with the end of the matching sleeve close to the connecting tube, and the pharmaceutical solution is fed into the dosing tube; When the mating ring is located at the third rotation stop point, the abutment arm is fitted against the end of the raised portion with the largest raised height, the toggle arm overcomes the elastic force of the second elastic member and rotates relative to the reference axis, and the pressing arm pushes the moving member into the inner cavity, thereby utilizing the airflow to fully blow out the drug solution in the dosing tube.

5. The dosing device for sewage treatment according to claim 1, characterized in that: The moving part is provided with an air hole, which runs from a side surface of the moving part away from the dosing tube to a side surface of the moving part close to the dosing tube, and the air hole is matched with a second one-way valve.

6. The dosing device for sewage treatment according to claim 1, characterized in that: The ends of the abutting arm and the pressing arm are both fixedly connected with matching balls, and the surfaces of the matching balls are smoothed.

7. The dosing device for sewage treatment according to claim 1, characterized in that: A transition section is further connected between the dosing tube and the base. In the direction from the base to the dosing tube, the inner diameter of the transition section decreases gradually.

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