A dosing device and dosing method

Abstract

This invention discloses a dosing device and a dosing method. The dosing device includes a drug storage device connected to a dispensing pipe. A drug pump, a first pressure detection device, a flow detection device, and a terminal dosing system are sequentially connected to the dispensing pipe. The terminal dosing system includes a branch pipe connected to the dispensing pipe. A second pressure detection device, a manual ball valve, a first back pressure valve, a dosing mechanism, and a second back pressure valve are sequentially connected to the branch pipe. A terminal dosing port is connected to the end of the branch pipe. The dosing mechanism includes a piston fixing housing, within which a piston is slidably connected. This invention ensures that the entire dispensing pipe is filled with drug by controlling the pressure of the dispensing pipe. It can control the rotation speed of the drive device according to the different dosing flow requirements at each dosing point, achieving accuracy and stability of the drug dosage at each dosing point, and effectively reducing the difficulty of precisely adjusting the different drug dosages at multiple dosing points.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a dosing device and a dosing method. Background Technology

[0002] In the process of wastewater treatment, the purification effect of wastewater is improved by adding the required agents. Common liquid agents include carbon sources, flocculants, defoamers, acids, and alkalis.

[0003] If multiple dosing points at different locations require the same liquid agent, the usual dosing method is to use a set of pumps (diaphragm pump, screw pump, etc.) to pump the agent to each dosing point through pipelines. The total amount of agent added is adjusted by controlling the operating frequency and number of pumps, and the amount of agent added to each dosing point is adjusted by controlling the opening of the valves (manual valve, electric valve, etc.) set at each dosing point.

[0004] Flow meters are typically installed at the main outlet of a group of pumps, with no flow meters installed at individual dosing points. Furthermore, the small amounts of chemicals added make obtaining accurate flow rates difficult. Precise control of the dosage at each dosing point is also challenging; often, once the dosage at one dosing point is adjusted, the dosage at other dosing points changes accordingly. This lack of accuracy and stability in the dosage at each dosing point severely impacts the wastewater treatment effect. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a dosing device and a dosing method, which can accurately control the dosing amount and dosing speed at each dosing point.

[0006] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides a dosing device, including a drug storage device, the drug storage device being connected to a drug outlet pipe, and a drug pumping device, a first pressure detection device, a flow detection device, and a terminal dosing system being sequentially connected to the drug outlet pipe; The terminal dosing system includes a branch pipe connected to the dosing pipe. A second pressure detection device, a manual ball valve, a first back pressure valve, a dosing mechanism, and a second back pressure valve are sequentially connected to the branch pipe. The end of the branch pipe is connected to a terminal dosing port. The dosing mechanism includes a piston fixing shell and a drive device fixing shell disposed on the piston fixing shell. A piston is slidably connected inside the piston fixing shell, and a fixing column is fixedly connected to the upper end face of the piston. The fixing column passes through the piston fixing shell and is slidably connected to the piston fixing shell. A drive device and a squeezing wheel are disposed inside the drive device fixing shell. The drive device is driven and connected to the squeezing wheel via a conveyor belt. The upper end face of the piston is connected to the inner top wall of the piston fixing shell by a spring. The bottom surface of the squeezing wheel is inclined and abuts against the top of the fixing column. The drive device is used to drive the squeezing wheel to rotate, and the squeezing wheel and the spring drive the fixing column and the piston to perform reciprocating lifting and lowering motion.

[0007] In one embodiment of the present invention, the dosing mechanism further includes a bottom shell, a diaphragm on the upper part of the bottom shell, a piston fixing shell on the upper part of the diaphragm, and a top cover on the upper part of the drive device fixing shell. The bottom shell, diaphragm, piston fixing shell, drive device fixing shell, and top cover are fixedly connected by bolts.

[0008] In one embodiment of the present invention, the bottom shell is provided with an inlet and an outlet, and a dosing chamber is formed between the bottom shell and the diaphragm. The dosing chamber is connected to a first back pressure valve through the inlet of the bottom shell, and the dosing chamber is connected to a second back pressure valve through the outlet of the bottom shell.

[0009] In one embodiment of the present invention, a plurality of springs are arranged around the fixed post, one end of each spring is hinged to the upper end face of the piston, and the other end is hinged to the inner top wall of the piston fixed housing.

[0010] In one embodiment of the present invention, a pressurized chamber is formed between the piston fixing shell, the piston and the diaphragm, and the pressurized chamber is filled with an incompressible liquid.

[0011] In one embodiment of the present invention, a plurality of positioning pins are fixedly connected to the upper end face of the piston. The plurality of positioning pins are arranged around the fixed pin. Each positioning pin is provided with a liquid injection hole communicating with the pressurization chamber. Each positioning pin is also provided with a liquid injection hole plug for blocking the liquid injection hole at its end.

[0012] In one embodiment of the present invention, a control cabinet is also included, wherein the drug storage device, drug pumping equipment, first pressure detection device, flow detection device, and dosing mechanism are all electrically connected to the control cabinet.

[0013] Secondly, the present invention provides a dosing method using the aforementioned dosing device, wherein multiple sets of terminal dosing ports of the terminal dosing system are respectively installed at various dosing points in a wastewater treatment plant, and the dosing method includes the following steps: S1: The prepared liquid medicine is stored in a medicine storage device; S2: The chemical pumping equipment pumps the chemical from the chemical storage device to each terminal dosing system through the outlet pipe. A first pressure detection device and a flow detection device are installed on the outlet pipe at the outlet position of the chemical pumping equipment to detect the pressure value and flow value of the outlet pipe. S3: During the drug delivery process, the pressure change in the drug tube is detected by the first pressure detection device. When the pressure is less than the set pressure, the working frequency of the drug pumping equipment is increased. The greater the difference between the detected pressure and the set value, the faster the working frequency of the drug pumping equipment changes. The smaller the difference between the detected pressure and the set value, the slower the working frequency of the drug pumping equipment changes, so that the pressure in the drug outlet tube is stabilized at the set pressure. S4: When the dosing point needs to add chemicals, open the manual ball valve. The chemicals flow from the outlet pipe to the branch pipe, and then flow through the second pressure detection device, the manual ball valve, the first back pressure valve, the dosing mechanism, and the second back pressure valve in sequence, and finally flow out through the end dosing port. S5: The drive unit in the dosing mechanism drives the extrusion wheel to rotate via a conveyor belt. During the rotation of the extrusion wheel, the inclined surface at its bottom cycles from the highest point to the lowest point and then from the lowest point to the highest point. S6: The piston fixing shell and the piston in the dosing mechanism are connected by a spring. When the piston is not subjected to external force, the spring pull makes the piston abut against the lower end face of the extrusion wheel. S7: The pressure in the outlet pipe is the pressure before the first back pressure valve, and the pressure in the dosing chamber is the pressure after the first back pressure valve. When the pressure difference between the outlet pipe and the dosing chamber is greater than the opening pressure of the first back pressure valve, the first back pressure valve opens, allowing the agent to flow through the first back pressure valve and fill the dosing chamber of the dosing mechanism. When the dosing chamber is full of agent, the pressure difference before and after the first back pressure valve is less than the opening pressure of the first back pressure valve, and the first back pressure valve closes. S8: The pressure in the dosing chamber is the pressure before the second back pressure valve, the dosing port at the end is open, and the atmospheric pressure is the pressure after the second back pressure valve. When the pressure difference between the dosing chamber and the atmospheric pressure is less than the opening pressure of the second back pressure valve, the second back pressure valve will not open, and the agent cannot flow through the second back pressure valve and flow out from the dosing port at the end. S9: When the bottom surface of the extrusion wheel rotates from the highest point to the lowest point of contact with the fixed column, the bottom surface of the extrusion wheel squeezes the piston through the fixed column, overcoming the spring tension and causing the piston to move downward. The piston squeezes the pressurization chamber. Since the liquid in the pressurization chamber is incompressible, the diaphragm moves downward, thereby squeezing the dosing chamber, overcoming the pressure of the second back pressure valve, and squeezing the agent out of the outlet of the bottom shell. When the piston reaches the lowest point, it no longer exerts pressure on the pressurization chamber, and the second back pressure valve closes. S10: When the bottom surface of the extrusion wheel rotates from the lowest point to the highest point of contact with the fixed column, the piston loses the pressure of the extrusion wheel. Under the action of the spring tension, the piston moves with the bottom surface of the extrusion wheel from the lowest point to the highest point. The diaphragm moves upward, and the pressure in the dosing chamber decreases. When the pressure difference between the front and rear of the first back pressure valve is greater than the opening pressure of the first back pressure valve, the cycle returns to S7. S11: The piston moves from the highest point to the lowest point and then back to the highest point, which is one reciprocating cycle. When the piston moves from the highest point to the lowest point, the drug flows out of the dosing port at the end. When the piston moves from the lowest point to the highest point, the drug does not flow out of the dosing port at the end. S12: The drive unit controls the reciprocating frequency of the piston by controlling the rotation speed of the extrusion wheel. The higher the reciprocating frequency, the more agent flows out of the end dosing port. The rotation speed requirement of the drive unit is calculated based on the agent flow rate required by the end dosing port.

[0014] In one embodiment of the present invention, the relevant calculations in S12 are as follows: The volume of medicine extruded in a single cycle of the piston's reciprocating motion is V The unit is mL ; The rotational speed of the drive device is N 1. The unit is r / min ; The rotational speed of the extrusion roller is N 2, unit is r / min ; The transmission ratio between the drive device and the extrusion wheel is n, n= N 1 / N 2; The rotation cycle of the extrusion roller is T 2, unit is min / r ; The reciprocating cycle of the piston is the same as the rotation cycle of the extrusion wheel, both being... T 2, T 2 = 1 / N 2; The flow rate at the terminal dosing port is Q, Q= V / T 2= N 1 V / n, in units of mL / min .

[0015] In one embodiment of the present invention, multiple sets of end-point dosing systems are connected to the dispensing pipe. One end of each set of end-point dosing systems is connected to the dispensing pipe, and the other end is connected to the end-point dosing port. When one set of end-point dosing systems is selected, during the reciprocating cycle of a single piston, the end-point dosing port does not dispense medication, and the dosing process is discontinuous. If continuous dosing is required, two sets of end-point dosing systems are selected to operate in parallel. When the piston of one dosing mechanism moves from the lowest point to the highest point, the piston of the other dosing mechanism moves from the highest point to the lowest point to ensure the continuity of medication dispensing from the end-point dosing port.

[0016] The beneficial effects of this invention are: This invention provides a dosing device and method. Through the combined action of a squeezing wheel and a spring, a fixed column and a piston reciprocate up-and-down in motion, causing the piston to move up and down within its fixed housing. One reciprocating cycle consists of the piston moving from its highest point to its lowest point and back to its highest point. When the piston moves from its highest to its lowest point, chemicals flow out of the dosing port; when it moves from its lowest to its highest point, no chemicals flow out. The reciprocating frequency of the piston is controlled by the rotational speed of the squeezing wheel via a drive device. A higher reciprocating frequency results in more chemicals flowing out of the dosing port. Therefore, by controlling the rotational speed of the drive device, the flow rate of chemicals at the dosing port can be controlled, enabling precise control of the dosage and speed at each dosing point. This ensures the accuracy and stability of the dosage at each dosing point, preventing any impact on the wastewater treatment effect. In summary, during use, this invention ensures that the entire dispensing pipe is filled with the agent by controlling the pressure of the dispensing pipe. It can also control the rotation speed of the drive device according to the different dosing flow requirements of each dosing point, thereby achieving the accuracy and stability of the agent dosage at each dosing point and effectively reducing the difficulty of controlling the precise adjustment of different agent dosages between multiple dosing points. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the system composition of a dosing device provided by the present invention.

[0018] Figure 2 This is a schematic diagram of the structural composition of the end-point drug delivery system provided by the present invention.

[0019] Figure 3 This is a structural disassembly diagram of the dosing mechanism provided by the present invention.

[0020] Figure 4 This is a schematic diagram of the piston of the dosing mechanism provided by the present invention rotating to one of its positions.

[0021] Figure 5 This is a schematic diagram of the piston of the dosing mechanism provided by the present invention rotating to another position.

[0022] Figure 6 This is a front view of the dosing mechanism provided by the present invention.

[0023] Figure 7 for Figure 6 Sectional view along direction AA.

[0024] Figure 8 This is a top view of the piston of the dosing mechanism provided by the present invention.

[0025] Figure 9 for Figure 8 BB-direction sectional view.

[0026] Figure 10 This is a schematic diagram of the structural composition of the two sets of end-point dosing systems provided by the present invention.

[0027] The components include: 1. Drug storage device; 2. Drug pumping equipment; 3. First pressure detection device; 4. Flow detection device; 5. Drug outlet pipe; 6. End-point dosing system; 7. Control cabinet; 61. Branch pipe; 62. Second pressure detection device; 63. Manual ball valve; 64. First back pressure valve; 65. Dosing mechanism; 66. Second back pressure valve; 67. End-point dosing port; 651. Bottom shell; 652. Diaphragm; 653. Piston; 6531. Fixing column; 6532. Positioning column; 654. Spring; 655. Piston fixing shell; 656. Extrusion wheel; 657. Drive unit; 658. Conveyor belt; 659. Drive unit fixing shell; 6510. Top cover; 6511. Bolt; 6512. Dosing chamber; 6513. Pressurization chamber; 6561. Injection hole; 6562. Injection hole plug. Detailed Implementation

[0028] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0031] like Figure 1 As shown, the present invention provides a dosing device. In some embodiments, the dosing device includes a drug storage device 1, the drug storage device 1 is connected to a drug outlet pipe 5, and the drug outlet pipe 5 is sequentially connected to a drug pumping device 2, a first pressure detection device 3, a flow detection device 4, and a terminal dosing system 6.

[0032] like Figure 2 As shown, in some embodiments, the terminal dosing system 6 includes a branch pipe 61 connected to the dosing pipe 5. The branch pipe 61 is sequentially connected to a second pressure detection device 62, a manual ball valve 63, a first back pressure valve 64, a dosing mechanism 65, and a second back pressure valve 66. The end of the branch pipe 61 is connected to a terminal dosing port 67.

[0033] like Figures 3-9 As shown, in some embodiments, the dosing mechanism 65 includes a bottom shell 651, a diaphragm 652 on the upper part of the bottom shell 651, a piston fixing shell 655 on the upper part of the diaphragm 652, a drive device fixing shell 659 on the upper part of the piston fixing shell 655, and a top cover 6510 on the upper part of the drive device fixing shell 659. The bottom shell 651, diaphragm 652, piston fixing shell 655, drive device fixing shell 659, and top cover 6510 are fixedly connected by bolts 6511.

[0034] Furthermore, the bottom shell 651 is provided with an inlet and an outlet, and a dosing chamber 6512 is formed between the bottom shell 651 and the diaphragm 652. The dosing chamber 6512 is connected to the first back pressure valve 64 through the inlet of the bottom shell 651, and the dosing chamber 6512 is connected to the second back pressure valve 66 through the outlet of the bottom shell 651.

[0035] Furthermore, a piston 653 is slidably connected inside the piston fixing housing 655, and a fixing post 6531 is fixedly connected to the upper end face of the piston 653. The fixing post 6531 passes through the piston fixing housing 655 and is slidably connected to the piston fixing housing 655. A driving device 657 and a pressing wheel 656 are provided inside the driving device fixing housing 659. The driving device 657 is driven and connected to the pressing wheel 656 through a conveyor belt 658. The upper end face of the piston 653 is connected to the inner top wall of the piston fixing housing 655 by a spring 654. The bottom surface of the pressing wheel 656 is inclined and abuts against the top of the fixing post 6531. The driving device 657 is used to drive the pressing wheel 656 to rotate, and the pressing wheel 656 and the spring 654 drive the fixing post 6531 and the piston 653 to perform reciprocating lifting and lowering movements.

[0036] In this embodiment, since the bottom surface of the extrusion roller 656 is inclined and abuts against the top of the fixed column 6531, the driving device 657 drives the extrusion roller 656 to rotate. When the bottom surface of the extrusion roller 656 rotates from the highest point to the lowest point of contact with the fixed column 6531, it causes the piston 653 to move downward by extruding the piston 653. When the bottom surface of the extrusion roller 656 rotates from the lowest point to the highest point of contact with the fixed column 6531, it causes the piston 653 to move upward by the elastic force of the spring 654. Thus, through the combined action of the extrusion roller 656 and the spring 654, the fixed column 6531 and the piston 653 can be driven to perform reciprocating up-and-down movements, so that the piston 653 moves up and down within the piston fixing housing 655.

[0037] Optionally, a plurality of springs 654 are arranged around the fixed post 6531, with one end of each spring 654 hinged to the upper end face of the piston 653 and the other end hinged to the inner top wall of the piston fixing housing 655.

[0038] In this embodiment, a number of springs 654 are arranged around the fixed column 6531, so that when the springs 654 pull the piston 653 upward, the pulling force is more uniform, and the piston 653 can be smoothly pulled to rise steadily, thereby ensuring that the piston 653 performs a smooth up-and-down reciprocating motion within the piston fixed housing 655.

[0039] Furthermore, a pressurized chamber 6513 is formed between the piston fixing housing 655, the piston 653 and the diaphragm 652, and the pressurized chamber 6513 is filled with incompressible liquid.

[0040] Furthermore, a plurality of positioning posts 6532 are fixedly connected to the upper end face of the piston 653. These positioning posts 6532 are arranged around the fixed post 6531. Each positioning post 6532 has an injection hole 6561 communicating with the pressurization chamber 6513. Each positioning post 6532 also has an injection hole plug 6562 at its end for plugging the injection hole 6561. After the pressurization chamber 6513 is filled with incompressible liquid, the injection hole plug 6562 is screwed on to ensure that there is no gas inside the chamber.

[0041] Optionally, the system also includes a control cabinet 7, to which the reagent storage device 1, reagent pumping equipment 2, first pressure detection device 3, flow detection device 4, and dosing mechanism 65 are all electrically connected. The operation of each of the above-mentioned devices is controlled through the control cabinet 7.

[0042] In some embodiments, the dispensing pipe 5 is connected to multiple sets of end-point dosing systems 6, one end of each set of end-point dosing systems 6 is connected to the dispensing pipe 5, and the other end is connected to the end-point dosing port 67.

[0043] like Figure 10 As shown, in this embodiment, the end-point dosing system 6 consists of two sets.

[0044] Furthermore, the present invention also provides a dosing method using the aforementioned dosing device, wherein multiple sets of terminal dosing ports 67 of the terminal dosing system 6 are respectively installed at various dosing points in the wastewater treatment plant, and the dosing method includes the following steps: S1: The prepared liquid medicine is stored in medicine storage device 1; S2: The agent pumping equipment 2 pumps the agent in the agent storage device 1 through the agent outlet pipe 5 to each terminal dosing system 6. A first pressure detection device 3 and a flow detection device 4 are installed on the agent outlet pipe 5 at the outlet position of the agent pumping equipment 2 to detect the pressure value and flow value of the agent outlet pipe 5. S3: During the drug delivery process, the pressure change in the drug tube 5 is detected by the first pressure detection device 3. When the pressure is less than the set pressure, the working frequency of the drug pumping device 2 is increased. The greater the difference between the detected pressure and the set value, the faster the working frequency of the drug pumping device 2 changes. The smaller the difference between the detected pressure and the set value, the slower the working frequency of the drug pumping device 2 changes, so that the pressure in the drug tube 5 can be stabilized at the set pressure as soon as possible. S4: When the dosing point needs to add medicine, open the manual ball valve 63. The medicine flows from the outlet pipe 5 to the branch pipe 61, and then flows through the second pressure detection device 62, the manual ball valve 63, the first back pressure valve 64, the dosing mechanism 65, the second back pressure valve 66 in sequence, and finally flows out through the end dosing port 67. S5: The drive unit 657 in the dosing mechanism 65 causes the extrusion wheel 656 to rotate via the conveyor belt 658. During the rotation of the extrusion wheel 656, the inclined surface at its bottom goes from the highest point to the lowest point and then from the lowest point to the highest point in a cyclical motion. S6: The piston fixing housing 655 and piston 653 in the dosing mechanism 65 are connected by spring 654. When the piston 653 is not subjected to external force, the piston 653 is brought into contact with the lower end face of the extrusion roller 656 by the tension of spring 654. S7: The pressure in the drug outlet pipe 5 is the pressure before the first back pressure valve 64, and the pressure in the drug filling chamber 6512 is the pressure after the first back pressure valve 64. When the pressure difference between the drug outlet pipe 5 and the drug filling chamber 6512 is greater than the opening pressure of the first back pressure valve 64, the first back pressure valve 64 opens, allowing the drug to flow through the first back pressure valve 64 and fill the drug filling chamber 6512 of the drug filling mechanism 65. When the drug filling chamber 6512 is full of drug, the pressure difference before and after the first back pressure valve 64 is less than the opening pressure of the first back pressure valve 64, and the first back pressure valve 64 closes. S8: The pressure in the dosing chamber 6512 is the pressure before the second back pressure valve 66, and the end dosing port 67 is open. The atmospheric pressure is the pressure after the second back pressure valve 66. When the pressure difference between the dosing chamber 6512 and the atmospheric pressure is less than the opening pressure of the second back pressure valve 66, the second back pressure valve 66 will not open, and the agent cannot flow through the second back pressure valve 66 and flow out from the end dosing port 67. S9: When the bottom surface of the extrusion wheel 656 rotates from the highest point to the lowest point at the contact point with the fixed column 6531, the bottom surface of the extrusion wheel 656 squeezes the piston 653 through the fixed column 6531, overcoming the tension of the spring 654, causing the piston 653 to move downward. The piston 653 squeezes the pressurization chamber 6513. Since the liquid in the pressurization chamber 6513 is incompressible, the diaphragm 652 moves downward, thereby squeezing the dosing chamber 6512, overcoming the pressure of the second back pressure valve 66, and squeezing the agent out of the outlet of the bottom shell 651. When the piston 653 reaches the lowest point, it no longer generates pressure on the pressurization chamber 6513, and the second back pressure valve 66 closes. S10: When the bottom surface of the extrusion wheel 656 rotates from the lowest point to the highest point at the contact point with the fixed column 6531, after the piston 653 loses the pressure of the extrusion wheel 656, under the action of the spring 654, the piston 653 moves up from the lowest point to the highest point along with the bottom surface of the extrusion wheel 656, the diaphragm 652 moves upward, the pressure in the dosing chamber 6512 decreases, and when the pressure difference between the front and rear of the first back pressure valve 64 is greater than the opening pressure of the first back pressure valve 64, the cycle returns to S7. S11: The piston 653 moves from the highest point to the lowest point and then back to the highest point in one reciprocating cycle. When the piston 653 moves from the highest point to the lowest point, the drug filling port 67 at the end of the piston 653 flows out. When the piston 653 moves from the lowest point to the highest point, the drug filling port 67 at the end of the piston 653 does not flow out. S12: The drive device 657 controls the reciprocating frequency of the piston 653 by controlling the rotation speed of the extrusion wheel 656. The higher the reciprocating frequency, the more agent flows out of the end dosing port 67. The rotation speed requirement of the drive device 657 can be calculated based on the agent flow rate required by the end dosing port 67.

[0045] Optionally, the relevant calculations in S12 are as follows: The volume of medicine extruded in a single cycle of the piston's reciprocating motion is V The unit is mL ; The rotational speed of the drive device is N 1. The unit is r / min ; The rotational speed of the extrusion roller is N 2, unit is r / min ; The transmission ratio between the drive device and the extrusion wheel is n, n= N 1 / N 2; The rotation cycle of the extrusion roller is T 2, unit is min / r ; The reciprocating cycle of the piston is the same as the rotation cycle of the extrusion wheel, both being... T 2, T 2 = 1 / N 2; The flow rate at the terminal dosing port is Q, Q= V / T 2= N 1 V / n, in units of mL / min .

[0046] When one set of end-point dosing systems 6 is selected, during the reciprocating cycle of a single piston 653, the end-point dosing port 67 does not dispense pesticide, and the dosing process is discontinuous. If continuous dosing is required, two sets of end-point dosing systems 6 are selected to operate in parallel. When the piston 653 of one dosing mechanism 65 moves from the lowest point to the highest point, the piston 653 of the other dosing mechanism 65 moves from the highest point to the lowest point, which can ensure the continuity of pesticide dispensing from the end-point dosing port 67.

[0047] This invention provides a dosing device and method. Through the combined action of a squeeze wheel 656 and a spring 654, the fixed column 6531 and piston 653 reciprocate upwards and downwards, causing the piston 653 to move up and down within the piston fixing housing 655. One reciprocating cycle consists of the piston 653 moving from its highest point to its lowest point and back to its highest point. When the piston 653 moves from its highest point to its lowest point, a chemical flows out of the dosing port 67 at the end of the cycle; when it moves from its lowest point to its highest point, no chemical flows out of the dosing port 67. The driving device 657 controls the rotational speed of the squeeze wheel 656, thus controlling the reciprocating frequency of the piston 653. A higher reciprocating frequency results in more chemical flowing out of the dosing port 67. Therefore, by controlling the rotational speed of the driving device 657, the chemical flow rate at the dosing port 67 can be controlled, thereby precisely controlling the dosing amount and speed at each dosing point, ensuring the accuracy and stability of the dosage at each dosing point, and avoiding any impact on the wastewater treatment effect. In summary, during use, this invention ensures that the entire dispensing pipe is filled with the agent by controlling the pressure of the dispensing pipe. It can also control the rotation speed of the drive device according to the different dosing flow requirements of each dosing point, thereby achieving the accuracy and stability of the agent dosage at each dosing point and effectively reducing the difficulty of controlling the precise adjustment of different agent dosages between multiple dosing points.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A dosing device, characterized in that, It includes a drug storage device, which is connected to a drug outlet pipe. The drug outlet pipe is sequentially connected to a drug pumping device, a first pressure detection device, a flow detection device, and a terminal dosing system. The terminal dosing system includes a branch pipe connected to the dosing pipe. A second pressure detection device, a manual ball valve, a first back pressure valve, a dosing mechanism, and a second back pressure valve are sequentially connected to the branch pipe. The end of the branch pipe is connected to a terminal dosing port. The dosing mechanism includes a piston fixing housing and a drive device fixing housing disposed on the piston fixing housing. A piston is slidably connected inside the piston fixing housing, and a fixing column is fixedly connected to the upper end face of the piston. The fixing column passes through the piston fixing housing and is slidably connected to the piston fixing housing. A drive device and a squeezing wheel are disposed inside the drive device fixing housing. The drive device is driven and connected to the squeezing wheel via a conveyor belt. The upper end face of the piston is connected to the inner top wall of the piston fixing housing by a spring. The bottom surface of the squeezing wheel is inclined and abuts against the top of the fixing column. The drive device is used to drive the squeezing wheel to rotate, and the squeezing wheel and the spring drive the fixing column and the piston to perform reciprocating lifting and lowering motion. The drive device controls the reciprocating frequency of the piston by controlling the rotational speed of the extrusion roller; The dosing mechanism further includes a bottom shell, a diaphragm on the upper part of the bottom shell, a piston fixing shell on the upper part of the diaphragm, and a dosing chamber formed between the bottom shell and the diaphragm; a pressurizing chamber is formed between the piston fixing shell, the piston and the diaphragm, and the pressurizing chamber is filled with incompressible liquid; the bottom shell has an inlet and an outlet, the dosing chamber is connected to a first back pressure valve through the inlet of the bottom shell, and the dosing chamber is connected to a second back pressure valve through the outlet of the bottom shell; It also includes a control cabinet, and the drug storage device, drug pumping equipment, first pressure detection device, flow detection device, and dosing mechanism are all electrically connected to the control cabinet.

2. The dosing device according to claim 1, characterized in that, The upper part of the drive device fixed housing is provided with an upper cover, and the bottom shell, diaphragm, piston fixed housing, drive device fixed housing and upper cover are fixedly connected by bolts.

3. The dosing device according to claim 2, characterized in that, Several springs are arranged around the fixed post, with one end of each spring hinged to the upper end face of the piston and the other end hinged to the inner top wall of the piston fixed housing.

4. The dosing device according to claim 3, characterized in that, The upper end face of the piston is also fixedly connected to several positioning posts, which are arranged around the fixed post. Each positioning post is provided with a liquid injection hole that communicates with the pressurization chamber, and the end of each positioning post is also provided with a liquid injection hole plug for blocking the liquid injection hole.

5. A method for administering medication, characterized in that, Using a dosing device according to any one of claims 1-4, multiple sets of terminal dosing inlets of the terminal dosing system are respectively installed at various dosing points in the wastewater treatment plant, and the dosing method includes the following steps: S1: The prepared liquid medicine is stored in a medicine storage device; S2: The chemical pumping equipment pumps the chemical from the chemical storage device to each terminal dosing system through the outlet pipe. A first pressure detection device and a flow detection device are installed on the outlet pipe at the outlet position of the chemical pumping equipment to detect the pressure value and flow value of the outlet pipe. S3: During the drug delivery process, the pressure change in the drug tube is detected by the first pressure detection device. When the pressure is less than the set pressure, the working frequency of the drug pumping equipment is increased. The greater the difference between the detected pressure and the set value, the faster the working frequency of the drug pumping equipment changes. The smaller the difference between the detected pressure and the set value, the slower the working frequency of the drug pumping equipment changes, so that the pressure in the drug outlet tube is stabilized at the set pressure. S4: When the dosing point needs to add chemicals, open the manual ball valve. The chemicals flow from the outlet pipe to the branch pipe, and then flow through the second pressure detection device, the manual ball valve, the first back pressure valve, the dosing mechanism, and the second back pressure valve in sequence, and finally flow out through the end dosing port. S5: The drive unit in the dosing mechanism drives the extrusion wheel to rotate via a conveyor belt. During the rotation of the extrusion wheel, the inclined surface at its bottom cycles from the highest point to the lowest point and then from the lowest point to the highest point. S6: The piston fixing shell and the piston in the dosing mechanism are connected by a spring. When the piston is not subjected to external force, the spring pull makes the piston abut against the lower end face of the extrusion wheel. S7: The pressure in the outlet pipe is the pressure before the first back pressure valve, and the pressure in the dosing chamber is the pressure after the first back pressure valve. When the pressure difference between the outlet pipe and the dosing chamber is greater than the opening pressure of the first back pressure valve, the first back pressure valve opens, allowing the agent to flow through the first back pressure valve and fill the dosing chamber of the dosing mechanism. When the dosing chamber is full of agent, the pressure difference before and after the first back pressure valve is less than the opening pressure of the first back pressure valve, and the first back pressure valve closes. S8: The pressure in the dosing chamber is the pressure before the second back pressure valve, the dosing port at the end is open, and the atmospheric pressure is the pressure after the second back pressure valve. When the pressure difference between the dosing chamber and the atmospheric pressure is less than the opening pressure of the second back pressure valve, the second back pressure valve will not open, and the agent cannot flow through the second back pressure valve and flow out from the dosing port at the end. S9: When the bottom surface of the extrusion wheel rotates from the highest point to the lowest point of contact with the fixed column, the bottom surface of the extrusion wheel squeezes the piston through the fixed column, overcoming the spring tension and causing the piston to move downward. The piston squeezes the pressurization chamber. Since the liquid in the pressurization chamber is incompressible, the diaphragm moves downward, thereby squeezing the dosing chamber, overcoming the pressure of the second back pressure valve, and squeezing the agent out of the outlet of the bottom shell. When the piston reaches the lowest point, it no longer exerts pressure on the pressurization chamber, and the second back pressure valve closes. S10: When the bottom surface of the extrusion wheel rotates from the lowest point to the highest point of contact with the fixed column, the piston loses the pressure of the extrusion wheel. Under the action of the spring tension, the piston moves with the bottom surface of the extrusion wheel from the lowest point to the highest point. The diaphragm moves upward, and the pressure in the dosing chamber decreases. When the pressure difference between the front and rear of the first back pressure valve is greater than the opening pressure of the first back pressure valve, the cycle returns to S7. S11: The piston moves from the highest point to the lowest point and then back to the highest point in one reciprocating cycle. When the piston moves from the highest point to the lowest point, pesticide flows out of the end filling port. When the piston moves from the lowest point to the highest point, no pesticide flows out of the end filling port. S12: The drive unit controls the reciprocating frequency of the piston by controlling the rotation speed of the extrusion wheel. The higher the reciprocating frequency, the more agent flows out of the end dosing port. The rotation speed requirement of the drive unit is calculated based on the agent flow rate required by the end dosing port. Multiple sets of end-point dosing systems are connected to the dispensing pipe. One end of each set of end-point dosing systems is connected to the dispensing pipe, and the other end is connected to the end-point dosing port. When one set of end-point dosing systems is selected, during the reciprocating cycle of a single piston, the end-point dosing port does not dispense medication, and the dosing process is discontinuous. If continuous dosing is required, two sets of end-point dosing systems are selected to operate in parallel. When the piston of one dosing mechanism moves from the lowest point to the highest point, the piston of the other dosing mechanism moves from the highest point to the lowest point to ensure the continuity of medication dispensing from the end-point dosing port.

6. The dosing method according to claim 5, characterized in that, The relevant calculations in S12 are as follows: The volume of medicine expelled in a single cycle of the piston's reciprocating motion is V The unit is mL ; The rotational speed of the drive device is N 1. The unit is r / min ; The rotational speed of the extrusion roller is N 2, unit is r / min ; The transmission ratio between the drive device and the extrusion wheel is n, n= N 1 / N 2; The rotation cycle of the extrusion roller is T 2, unit is min / r ; The reciprocating cycle of the piston is the same as the rotation cycle of the extrusion wheel, both being... T 2, T 2 = 1 / N 2; The flow rate at the terminal dosing port is Q, Q= V / T 2= N 1 V / n, in units of mL / min .

Images