PAM dispensing device and dispensing method thereof

Abstract

The PAM dispensing device comprises a hopper, a first-stage dispensing pool and a second-stage dispensing pool, and the bottom of the hopper is connected with one end of a compressed air pipe through a fluidization plate; the bottom opening end of the hopper is connected with the first-stage dispensing tank through a discharging pipe, a first-stage dispensing tank stirrer is arranged in the middle of the first-stage dispensing tank, and a first-stage dispensing tank water supplementing pipe is arranged on one side of the first-stage dispensing tank; an overflow opening in the top of the first-stage dispensing tank is connected with the second-stage dispensing tank through an overflow pipe, an emptying opening in the bottom of the first-stage dispensing tank is connected with the second-stage dispensing tank through an emptying pipe, a second-stage dispensing tank stirrer is arranged in the middle of the second-stage dispensing tank, and a second-stage dispensing tank water replenishing pipe is arranged on one side of the second-stage dispensing tank. According to the device, the fluidity and dispersity of solid PAM can be better under the driving action of airflow, the dissolution effect is improved, dispersion and dissolution of solid PAM particles are greatly promoted under the triple stirring action of airflow stirring, mechanical stirring and water flow stirring of supplemented water, and the PAM agglomeration or caking phenomenon is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of medicine dispensing production, and in particular to a PAM medicine dispensing device and a medicine dispensing method thereof. Background Art

[0002] PAM is the English abbreviation of polyacrylamide. In sewage treatment, PAM is used as a macromolecular coagulant to promote the flocculation and precipitation of suspended matter and improve the effluent effect. However, PAM is a macromolecular flocculant, which dissolves slowly, and the dispensing time is often long. In addition, it is easy to form lumps during the dispensing process (PAM solution), which affects the dispensing effect. After the lumps are formed, the reagents are wasted and the pipelines are easily blocked. Based on this, the current PAM dispensing mainly adopts manual dispensing. During the dispensing process, people sprinkle a small amount of PAM particles, mix them into the water, and stir them with a mixer to dissolve the PAM. In order to disperse the reagents and avoid lumps, the amount sprinkled each time is very small. At the same time, PAM dissolves slowly, which leads to a long dispensing time, a lot of manpower is wasted, and the work intensity of the operators is increased. In addition, because PAM has a certain viscosity, it is difficult to control the amount of PAM added in automatic dispensing control, which ultimately affects the dispensing effect. Summary of the invention

[0003] The object of the present invention is to provide a PAM dispensing device and a dispensing method thereof, so as to solve the problem of poor PAM dispensing effect in the prior art.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A PAM dispensing device, comprising:

[0006] A hopper, the bottom of which is connected to one end of a compressed air pipe through a fluidizing plate;

[0007] A primary dispensing pool is arranged below the hopper, and the bottom end of the hopper is connected to the primary dispensing pool through a feed pipe, a primary dispensing pool agitator is arranged at the middle of the primary dispensing pool, and a primary dispensing pool water supply pipe is arranged on one side of the primary dispensing pool;

[0008] The secondary medicine dispensing pool is arranged below the primary medicine dispensing pool, and the top overflow port of the primary medicine dispensing pool is connected to the secondary medicine dispensing pool through an overflow pipe, and the bottom vent port is connected to the secondary medicine dispensing pool through a vent pipe. A secondary medicine dispensing pool agitator is provided in the middle of the secondary medicine dispensing pool, and a secondary medicine dispensing pool water supply pipe is provided on one side of the secondary medicine dispensing pool.

[0009] As a further solution of the present invention: the compressed air pipe is provided with a compressed air electric valve, a compressed air pressure reducing valve and a dryer in sequence along its medium conveying direction.

[0010] As a further solution of the present invention: a feed port, a hopper radar level meter and a vacuum pressure release valve are provided on the top of the hopper, and a discharge control electric valve is provided on the discharge pipe;

[0011] Wherein, an interlocking control connection is established between the hopper radar level meter, the material discharge control electric valve and the compressed air electric valve.

[0012] As a further solution of the present invention: a radar level gauge for the primary dispensing pool is provided on the primary dispensing pool, and a water supply pipe for the primary dispensing pool is provided with an electric valve for water supply for the primary dispensing pool;

[0013] Among them, the radar level meter of the first-level medicine dispensing pool and the water replenishment electric valve of the first-level medicine dispensing pool are connected by an interlocking control.

[0014] As a further solution of the present invention: the secondary dispensing pool is provided with a secondary dispensing pool radar level gauge, the secondary dispensing pool water supply pipe is provided with a secondary dispensing pool water supply electric valve, and the vent pipe is provided with a vent valve;

[0015] Among them, an interlocking control connection is established between the radar level gauge of the secondary medicine dispensing tank, the electric water replenishment valve of the secondary medicine dispensing tank and the vent valve.

[0016] As a further solution of the present invention: the hopper is a conical funnel-shaped structure, and the angle α between the side wall of the hopper and the horizontal line is not less than 45°.

[0017] As a further solution of the present invention: a polytetrafluoroethylene coating is provided on the conical inner wall of the hopper.

[0018] As a further solution of the present invention: the volume of the secondary drug dispensing pool is larger than the volume of the primary drug dispensing pool.

[0019] As a further solution of the present invention: the height difference between the bottom end of the feed pipe and the top end of the overflow pipe is preset to be constant.

[0020] A PAM dispensing method comprises the following steps:

[0021] S1. Before starting to prepare the medicine, add the solid PAM required for one-time preparation through the feeding port of the hopper;

[0022] S2. When starting to dispense medicine, the compressed air electric valve, the material discharge control electric valve, the first-level dispensing pool water supply electric valve, the vent valve, and the second-level dispensing pool water supply electric valve are closed, and the first-level dispensing pool agitator and the second-level dispensing pool agitator are turned on;

[0023] S3, the first-level dispensing pool uses the first-level dispensing pool radar level gauge to monitor the liquid level, and the second-level dispensing pool uses the second-level dispensing pool radar level gauge to monitor the liquid level;

[0024] S4. When the liquid level of the primary dispensing tank is lower than the overflow port, the primary dispensing tank water supply electric valve on the primary dispensing tank water supply pipe is opened to automatically replenish the liquid;

[0025] S5. When the liquid level in the secondary dispensing pool is lower than the stirring slurry height of the agitator in the secondary dispensing pool, the secondary dispensing pool water replenishment electric valve on the secondary dispensing pool water replenishment pipe is opened to automatically replenish the liquid;

[0026] S6. When the liquid levels of the primary dispensing tank and the secondary dispensing tank meet the dispensing requirements, open the discharge control electric valve and the compressed air electric valve, and the compressed air pipe conveys the dried compressed air into the hopper through the fluidizing plate, the compressed air is mixed with the solid PAM, and the solid PAM is conveyed into the primary dispensing tank through the discharge pipe. After being stirred and dissolved in the primary dispensing tank, the dispensing liquid automatically flows into the secondary dispensing tank through the overflow pipe, and is further stirred and dissolved in the secondary dispensing tank;

[0027] S7. The material level in the hopper is monitored by the hopper radar level meter. When the minimum material level is reached, first close the compressed air electric valve, then close the discharge control electric valve. After 5 minutes, close the first-level dispensing tank water supply electric valve and open the vent valve. When the liquid level in the first-level dispensing tank reaches the minimum level, shut down the first-level dispensing tank agitator. When the liquid level in the second-level dispensing tank reaches the maximum level, close the second-level dispensing tank water supply electric valve, and shut down the second-level dispensing tank agitator at least 20 minutes later.

[0028] Beneficial effects of the present invention:

[0029] (1) The present application can utilize the driving effect of airflow to improve the fluidity and dispersibility of solid PAM9, and dissolve more fully in the process of dissolving in water. After the solid PAM9 enters the water of the primary dispensing pool with the airflow, the PAM dispensing is stirred more fully and the dissolution effect is better under the triple stirring effect of airflow stirring, mechanical stirring, and water flow stirring of supplementary water, which greatly promotes the dispersion and dissolution of solid PAM9 particles and improves the dissolution effect;

[0030] (2) In this application, a primary dispensing tank and a secondary dispensing tank are designed for use in combination. The primary dispensing tank has a small volume and a stable liquid level. Its main function is to make PAM dissolve more evenly and quickly in water under the triple effects of air flow, water flow and mechanical stirring. The secondary dispensing tank is mainly used to further stir and dissolve PAM and store the dissolved PAM solution.

[0031] (3) This application realizes the automation of PAM dispensing through interlocking control between liquid level, material level, valve and agitator equipment, ensures the stability and automation of dispensing, and can greatly reduce the workload of dispensing personnel;

[0032] (4) The present application designs the hopper as a conical funnel-shaped structure, and the angle α between the side wall of the hopper and the horizontal line is not less than 45°; a polytetrafluoroethylene coating is provided on the conical inner wall of the hopper. Considering that the solid PAM9 has a certain viscosity, the solid PAM9 can be prevented from adhering to the inner wall of the hopper and ensure that the solid PAM9 can smoothly enter the dispensing tank with the fluidizing air. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] Figure 1 It is a schematic diagram of the structure of the present invention;

[0035] Figure 2 It is a schematic diagram of the angle α between the side wall of the hopper of the present invention and the horizontal line.

[0036] In the figure: 1. Compressed air pipe; 2. Compressed air electric valve; 3. Compressed air pressure reducing valve; 4. Dryer; 5. Feed inlet; 6. Hopper radar level meter; 7. Vacuum pressure release valve; 8. Hopper; 9. Solid PAM; 10. Fluidizing plate; 11. Unloading control electric valve; 12. First-level dispensing tank water supply pipe; 13. First-level dispensing tank water supply electric valve; 14. First-level dispensing tank agitator; 15. Unloading pipe; 16. First-level dispensing tank; 17. Overflow pipe; 18. Vent valve; 19. Second-level dispensing tank water supply pipe; 20. Second-level dispensing tank water supply electric valve; 21. Second-level dispensing tank agitator; 22. Second-level dispensing tank radar level meter; 23. Second-level dispensing tank; 24. First-level dispensing tank radar level meter. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in the description of the present invention, the meaning of "multiple" and "several" is at least two, for example two, three, etc., unless otherwise clearly and specifically defined.

[0039] See also Figure 1As shown, the present invention is a PAM dispensing device, including a hopper 8, a primary dispensing pool 16 and a secondary dispensing pool 23, the bottom of the hopper 8 is connected to one end of a compressed air pipe 1 through a fluidizing plate 10; the primary dispensing pool 16 is arranged below the hopper 8, and the bottom end of the hopper 8 is connected to the primary dispensing pool 16 through a downpipe 15, a primary dispensing pool agitator 14 is provided at the middle position of the primary dispensing pool 16, and a primary dispensing pool water supply pipe 12 is provided on one side of the primary dispensing pool 16; the secondary dispensing pool 23 is arranged below the primary dispensing pool 16, and the top overflow port of the primary dispensing pool 16 is connected to the secondary dispensing pool 23 through an overflow pipe 17, and the bottom vent port is connected to the secondary dispensing pool 23 through a vent pipe, a secondary dispensing pool agitator 21 is provided at the middle position of the secondary dispensing pool 23, and a secondary dispensing pool water supply pipe 19 is provided on one side of the secondary dispensing pool 23.

[0040] During the use of the PAM dispensing device of the present application, solid PAM9 required for a single dispensing can be added to the hopper 8, and the compressed air pipe 1 conveys the airflow into the hopper 8 through the fluidizing plate 10. The driving effect of the airflow can be utilized to make the solid PAM9 more fluid and dispersible, and more fully dissolved in the process of dissolving in water. After the solid PAM9 enters the water of the primary dispensing pool 16 with the airflow, the PAM dispensing is more fully stirred and the dissolution effect is better under the triple stirring effects of airflow stirring, mechanical stirring, and water flow stirring of supplementary water, which greatly promotes the dispersion and dissolution of the solid PAM9 particles and improves the dissolution effect.

[0041] In the present application, a primary dispensing pool 16 and a secondary dispensing pool 23 are designed for use in dispensing. The volume of the secondary dispensing pool 23 is larger than that of the primary dispensing pool 16. The primary dispensing pool 16 is smaller in volume, and the primary dispensing pool 16 is easier and more fully stirred. Its main function is to make the solid PAM9 particles dissolve into water more evenly and quickly under the triple effects of air flow, water flow and mechanical stirring; but PAM has a large molecular weight and a long dissolution time, and it is obviously not enough to rely solely on the primary dispensing pool 16. For this reason, the secondary dispensing pool 23 is required to further stir and dissolve. The volume of the secondary stirring pool is larger, and the total volume of the secondary stirring pool can generally be considered according to the PAM solution consumption for 8-24 hours. Its main function is to further dissolve PAM and store the prepared PAM solution at the same time.

[0042] In this specific embodiment, the compressed air pipe 1 is provided with a compressed air electric valve 2, a compressed air pressure reducing valve 3 and a dryer 4 in sequence along its medium conveying direction; the medium conveyed by the compressed air pipe 1 to the hopper 8 is compressed air, and the conveying medium can also be replaced by nitrogen or the like, but from a safety perspective, compressed air is safer; during the compressed air conveying process, the compressed air is reduced in pressure by the compressed air pressure reducing valve 3, and the moisture is removed by the dryer 4, so that the compressed air conveyed in the hopper 8 is stable and dry.

[0043] It should be understood that the compressed air pipe 1 is connected to the hopper 8 through the fluidizing plate 10. The structure of the fluidizing plate 10 can be designed to be arranged along the circumferential wall of the hopper 8, and multiple air outlets are arranged on the fluidizing plate 10 so that the multiple air outlets can mix the compressed air and the solid PAM9 particles evenly.

[0044] In this specific embodiment, a feed port 5, a hopper radar level meter 6 and a vacuum pressure release valve 7 are provided on the top of the hopper 8, and a discharge control electric valve 11 is provided on the discharge pipe 15; wherein, an interlocking control connection is performed between the hopper radar level meter 6, the discharge control electric valve 11 and the compressed air electric valve 2; the present application monitors the material level through the hopper radar level meter 6, and when the lowest material level is reached, the compressed air electric valve 2 is closed first, and then the discharge control electric valve 11 is closed, so as to interlock the discharge control electric valve 11 and the compressed air electric valve 2 according to the material level of the hopper 8, and the interlocking control adopted can be realized by PLC program control.

[0045] In this specific implementation, a first-level dispensing pool radar level gauge 24 is provided on the first-level dispensing pool 16, and a first-level dispensing pool water replenishment electric valve 13 is provided on the first-level dispensing pool water replenishment pipe 12; wherein, an interlocking control connection is established between the first-level dispensing pool radar level gauge 24 and the first-level dispensing pool water replenishment electric valve 13; the present application monitors the liquid level through the first-level dispensing pool radar level gauge 24, and when the liquid level of the first-level dispensing pool 16 is lower than the overflow port, automatic liquid replenishment is performed by opening the first-level dispensing pool water replenishment electric valve 13 on the first-level dispensing pool water replenishment pipe 12; so as to interlock control the first-level dispensing pool water replenishment electric valve 13 according to the liquid level of the first-level dispensing pool 16, and the adopted interlocking control can be realized by PLC program control.

[0046] In this specific implementation, a secondary dispensing pool radar level gauge 22 is provided on the secondary dispensing pool 23, a secondary dispensing pool water replenishment electric valve 20 is provided on the secondary dispensing pool water replenishment pipe 19, and a vent valve 18 is provided on the vent pipe; wherein, an interlocking control connection is performed between the secondary dispensing pool radar level gauge 22, the secondary dispensing pool water replenishment electric valve 20 and the vent valve 18; the present application performs liquid level monitoring through the secondary dispensing pool radar level gauge 22, and when the liquid level of the secondary dispensing pool 23 is lower than the stirring slurry height of the secondary dispensing pool agitator 21, automatic liquid replenishment is performed by opening the secondary dispensing pool water replenishment electric valve 20 on the secondary dispensing pool water replenishment pipe 19; so as to interlock control the secondary dispensing pool water replenishment electric valve 20 and the vent valve 18 according to the liquid level of the secondary dispensing pool 23, and the adopted interlocking control can be realized by PLC program control.

[0047] In this specific embodiment, the height difference between the bottom end of the feed pipe 15 and the top end of the overflow pipe 17 is preset to be constant. When the hopper 8 is connected to the primary dispensing tank 16 through the feed pipe 15, in order to ensure that the solid PAM 9 can smoothly and evenly enter the primary dispensing tank 16, the compressed air flow and pressure are first reasonably controlled through the compressed air electric valve 2 and the compressed air pressure reducing valve 3 to ensure the stability of the pressure and flow. After the pressure is reduced, the compressed air pressure should be greater than the pressure generated by the difference between the lowest point of the feed pipe 15 and the highest point of the liquid level in the primary dispensing tank 16 (i.e., the liquid level at the overflow port of the primary dispensing tank 16) △ P, to ensure that the material can smoothly enter the primary dispensing tank 16. Under the premise of stable compressed air pressure, the compressed air flow rate is closely related to △P. To ensure the stability of the compressed air flow rate, according to the water pressure formula △P=ρ*g*h, ρ is the density parameter of water, g is the gravity acceleration parameter, under the condition of constant ρ and g, it is necessary to control the liquid level difference h from the lowest point of the feed pipe 15 to the highest point of the liquid level in the primary dispensing tank 16 (i.e. the liquid level at the overflow port of the primary dispensing tank 16) to be constant. For this reason, the primary dispensing tank 16 is designed to overflow, so that the liquid level can be kept constant in the non-emptying state.

[0048] In this specific implementation mode, Figure 2 As shown, the hopper 8 is a conical funnel-shaped structure, and the angle α between the side wall of the hopper 8 and the horizontal line is not less than 45°; a polytetrafluoroethylene coating is provided on the conical inner wall of the hopper 8. Considering that the solid PAM9 has a certain viscosity, the solid PAM9 can be prevented from adhering to the inner wall of the hopper 8 and ensure that the solid PAM9 can smoothly enter the dispensing tank with the fluidizing wind.

[0049] Combination Figure 1 to Figure 2 As shown, the present invention also provides a PAM dispensing method, comprising the following steps:

[0050] S1. Before starting to prepare the medicine, first add the solid PAM9 required for one preparation through the feed port 5 of the hopper 8.

[0051] S2. When starting to dispense medicine, the compressed air electric valve 2, the material discharge control electric valve 11, the first-level dispensing pool water replenishment electric valve 13, the vent valve 18, and the second-level dispensing pool water replenishment electric valve 20 are closed, and the first-level dispensing pool agitator 14 and the second-level dispensing pool agitator 21 are turned on.

[0052] S3. The first-level dispensing pool 16 uses the first-level dispensing pool radar level meter 24 to monitor the liquid level, and the second-level dispensing pool 23 uses the second-level dispensing pool radar level meter 22 to monitor the liquid level.

[0053] S4. When the liquid level of the primary medicine dispensing pool 16 is lower than the overflow port, the primary medicine dispensing pool water replenishment electric valve 13 on the primary medicine dispensing pool water replenishment pipe 12 is opened to automatically replenish the liquid.

[0054] S5. When the liquid level of the secondary dispensing pool 23 is lower than the stirring slurry height of the secondary dispensing pool agitator 21, automatic liquid replenishment is performed by opening the secondary dispensing pool water replenishment electric valve 20 on the secondary dispensing pool water replenishment pipe 19.

[0055] S6. When the liquid levels of the primary dispensing pool 16 and the secondary dispensing pool 23 meet the dispensing requirements, open the discharge control electric valve 11 and the compressed air electric valve 2, and the compressed air pipe 1 conveys the dried compressed air into the hopper 8 through the fluidizing plate 10, the compressed air is mixed with the solid PAM9, and the solid PAM9 is conveyed into the primary dispensing pool 16 through the discharge pipe 15. After being stirred and dissolved in the primary dispensing pool 16, the dispensing liquid automatically flows into the secondary dispensing pool 23 through the overflow pipe 17, and is further stirred and dissolved in the secondary dispensing pool 23.

[0056] S7. The material level in the hopper 8 is monitored by the hopper radar level meter 6. When the lowest material level is reached, the compressed air electric valve 2 is closed first, and then the material discharge control electric valve 11 is closed. After 5 minutes, the first-level dispensing tank water replenishment electric valve 13 is closed and the vent valve 18 is opened. When the liquid level in the first-level dispensing tank 16 reaches the lowest level, the first-level dispensing tank agitator 14 is shut down. When the liquid level in the second-level dispensing tank 23 reaches the highest level, the second-level dispensing tank water replenishment electric valve 20 is closed, and the second-level dispensing tank agitator 21 is shut down after at least 20 minutes.

[0057] By adopting the PAM dispensing method of the present application, the fluidization effect of wind can be used to disperse the solid PAM9 particles to avoid clumping. The solid PAM9 contacts water under the drive of the fluidizing gas. During the contact process, the wind can play a stirring role. At the same time, the mechanical stirring of the stirrer and the hydraulic stirring of the supplementary water greatly promote the dispersion and dissolution of the solid PAM9 particles and improve the dissolution effect. At the same time, the present application realizes the automation of PAM dispensing through the interlocking control between the liquid level, material level, valve and stirrer equipment, ensures the stability and automation of dispensing, and can greatly reduce the workload of dispensing personnel.

[0058] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A PAM dispensing device, characterized in that: include: A hopper (8), the bottom of which is connected to one end of a compressed air pipe (1) via a fluidizing plate (10); A primary medicine dispensing pool (16) is arranged below the hopper (8), and the bottom end of the hopper (8) is connected to the primary medicine dispensing pool (16) through a feed pipe (15), a primary medicine dispensing pool agitator (14) is arranged at the middle of the primary medicine dispensing pool (16), and a primary medicine dispensing pool water supply pipe (12) is arranged on one side of the primary medicine dispensing pool (16); The secondary dispensing pool (23) is arranged below the primary dispensing pool (16), and the top overflow port of the primary dispensing pool (16) is connected to the secondary dispensing pool (23) through an overflow pipe (17), and the bottom vent port is connected to the secondary dispensing pool (23) through a vent pipe. A secondary dispensing pool agitator (21) is provided at the middle of the secondary dispensing pool (23), and a secondary dispensing pool water supply pipe (19) is provided on one side of the secondary dispensing pool (23).

2. A PAM dispensing device according to claim 1, characterized in that: The compressed air pipe (1) is provided with a compressed air electric valve (2), a compressed air pressure reducing valve (3) and a dryer (4) in sequence along the medium conveying direction thereof.

3. A PAM dispensing device according to claim 2, characterized in that: The top of the hopper (8) is provided with a feed port (5), a hopper radar level meter (6) and a vacuum pressure release valve (7), and the discharge pipe (15) is provided with a discharge control electric valve (11); The hopper radar level meter (6), the material discharge control electric valve (11) and the compressed air electric valve (2) are connected in an interlocking control manner.

4. A PAM dispensing device according to claim 1, characterized in that: The first-level medicine dispensing pool (16) is provided with a first-level medicine dispensing pool radar level meter (24), and the first-level medicine dispensing pool water replenishment pipe (12) is provided with a first-level medicine dispensing pool water replenishment electric valve (13); The radar level meter (24) of the first-level medicine dispensing pool is connected to the electric water replenishment valve (13) of the first-level medicine dispensing pool in an interlocking control manner.

5. A PAM dispensing device according to claim 1, characterized in that: The secondary medicine dispensing pool (23) is provided with a secondary medicine dispensing pool radar level meter (22), the secondary medicine dispensing pool water supply pipe (19) is provided with a secondary medicine dispensing pool water supply electric valve (20), and the vent pipe is provided with a vent valve (18); The radar level meter (22) of the secondary medicine dispensing tank, the electric water replenishment valve (20) of the secondary medicine dispensing tank and the drain valve (18) are connected in an interlocking control manner.

6. A PAM dispensing device according to claim 1, characterized in that: The hopper (8) is a conical funnel-shaped structure, and the angle α between the side wall of the hopper (8) and the horizontal line is not less than 45°.

7. A PAM dispensing device according to claim 6, characterized in that: The conical inner wall of the hopper (8) is provided with a polytetrafluoroethylene coating.

8. A PAM dispensing device according to claim 1, characterized in that: The volume of the secondary drug dispensing pool (23) is greater than the volume of the primary drug dispensing pool (16).

9. A PAM dispensing device according to claim 1, characterized in that: The height difference between the bottom end of the feed pipe (15) and the top end of the overflow pipe (17) is preset to be constant.

10. A PAM dispensing method, characterized in that: The following steps are involved: S1. Before starting to prepare the medicine, first add the solid PAM (9) required for one preparation through the feed port (5) of the hopper (8); S2. When dispensing begins, the compressed air electric valve (2), the material dispensing control electric valve (11), the primary dispensing pool water supply electric valve (13), the vent valve (18), and the secondary dispensing pool water supply electric valve (20) are closed, and the primary dispensing pool agitator (14) and the secondary dispensing pool agitator (21) are turned on; S3, the first-level dispensing pool (16) uses the first-level dispensing pool radar level meter (24) to monitor the liquid level, and the second-level dispensing pool (23) uses the second-level dispensing pool radar level meter (22) to monitor the liquid level; S4. When the liquid level of the primary dispensing pool (16) is lower than the overflow port, the primary dispensing pool water supply electric valve (13) on the primary dispensing pool water supply pipe (12) is opened to automatically replenish the liquid; S5. When the liquid level of the secondary dispensing pool (23) is lower than the stirring slurry height of the secondary dispensing pool agitator (21), the secondary dispensing pool water replenishment electric valve (20) on the secondary dispensing pool water replenishment pipe (19) is opened to automatically replenish the liquid; S6. When the liquid levels of the primary dispensing tank (16) and the secondary dispensing tank (23) meet the dispensing requirements, the discharge control electric valve (11) and the compressed air electric valve (2) are opened, and the compressed air pipe (1) conveys the dried compressed air into the hopper (8) through the fluidizing plate (10), and the compressed air is mixed with the solid PAM (9), and the solid PAM (9) is conveyed into the primary dispensing tank (16) through the discharge pipe (15). After being stirred and dissolved in the primary dispensing tank (16), the dispensing liquid automatically flows into the secondary dispensing tank (23) through the overflow pipe (17), and is further stirred and dissolved in the secondary dispensing tank (23); S7. The material level in the hopper (8) is monitored by the hopper radar level meter (6). When the material level reaches the lowest level, the compressed air electric valve (2) is closed first, and then the material discharge control electric valve (11) is closed. After 5 minutes, the first-level drug dispensing tank water supply electric valve (13) is closed and the vent valve (18) is opened. When the liquid level in the first-level drug dispensing tank (16) reaches the lowest level, the first-level drug dispensing tank agitator (14) is shut down. When the liquid level in the second-level drug dispensing tank (23) reaches the highest level, the second-level drug dispensing tank water supply electric valve (20) is closed. After at least 20 minutes, the second-level drug dispensing tank agitator (21) is shut down.

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