Spraying system with functions of automatically and uniformly mixing liquid medicine and conveying liquid medicine at constant pressure

Abstract

A spraying system with automatic uniform liquid medicine mixing and constant-pressure conveying functions relates to the field of agricultural plant protection equipment and comprises a liquid medicine mixing structure and a spraying structure, the liquid medicine mixing structure comprises two liquid medicine storage boxes, liquid medicine injection holes are formed in the tops of the liquid medicine storage boxes, liquid medicine outlet holes are formed in the bottoms of the liquid medicine storage boxes, and the two liquid medicine storage boxes are connected through a pipeline and a tee joint; the tee joint is connected with a bent pipe through a pesticide feeding pump, the bent pipe is arranged at the top of a pesticide mixing barrel, and a stirring plate is arranged in the pesticide mixing barrel; the spraying structure comprises a liquid outlet pipe, one end of the liquid outlet pipe is connected into the pesticide mixing barrel, the other end of the liquid outlet pipe is installed on a pesticide conveying pump, the pesticide conveying pump is connected with a spraying pipe, and a nozzle is arranged on the spraying pipe. Compared with the prior art, the spraying device has the advantages that the mixing uniformity, the spraying consistency and the operation convenience are remarkably improved, the spraying device is suitable for large-scale precise agricultural spraying operation, manual intervention is reduced, and the liquid medicine utilization rate and the operation efficiency are improved.

Description

Technical Field

[0001] This application relates to the field of agricultural plant protection equipment, and in particular to a spraying system with automatic mixing and constant pressure delivery of pesticide solution. Background Technology

[0002] In the field of agricultural plant protection, spraying systems are key equipment for pest and disease control, and their performance directly affects operational efficiency and control effectiveness. As modern agriculture develops towards precision and intelligence, the limitations of traditional spraying systems in terms of pesticide mixing uniformity and pressure stability are becoming increasingly apparent. Current technologies often rely on manual stirring or a single agitator for pesticide mixing, such as using a single storage tank and a mechanical agitator. However, this results in uneven mixing and sedimentation, especially when mixing multiple pesticides, making it difficult to ensure complete integration of components and leading to fluctuations in efficacy. Furthermore, traditional spraying systems generally use mechanical pressure regulating valves for pressure control, maintaining pressure through springs and diaphragms. However, these valves have slow response times and low pressure control accuracy. When operating with multiple nozzles, pressure fluctuations can cause excessively high flow rate variations, wasting pesticides and affecting the uniformity of control.

[0003] Further analysis reveals that the shortcomings of existing technologies are mainly reflected in two aspects: First, the mixing structure is simple and lacks a multi-stage mixing mechanism, making it difficult to cope with complex pesticide formulation requirements; second, pressure control relies on mechanical components, making dynamic adjustment impossible and unable to adapt to the pressure requirements of different operating scenarios. For example, in orchard pest and disease control, two or more pesticides need to be sprayed simultaneously. Traditional systems require repeated stirring due to uneven mixing, increasing time by 40%. In large-scale farmland operations, pressure fluctuations lead to inconsistent nozzle flow rates, resulting in excessive pesticide application in some areas and insufficient coverage in others, severely affecting the control effect. Although some studies have attempted to improve performance by increasing the number of stirrers or improving the pressure regulating valve structure, these methods have not fundamentally solved the contradiction between mixing efficiency and pressure stability, and have increased equipment complexity and cost. Utility Model Content

[0004] This application provides a spray system with automatic mixing and constant pressure delivery of the liquid medicine, which solves the problem that existing spray systems have significant defects in terms of the uniformity of liquid medicine mixing and pressure stability.

[0005] This application provides a spray system with automatic drug mixing and constant pressure delivery, including a mixing structure and a spraying structure. The mixing structure includes a drug storage tank, with an injection hole at the top and a discharge hole at the bottom. There are two drug storage tanks, which are connected by a pipe and a tee. The tee is connected to a bend pipe via a drug delivery pump. The bend pipe is located at the top of the mixing tank, and a stirring plate is provided inside the mixing tank.

[0006] The spray structure includes a liquid outlet pipe, one end of which is connected to the mixing tank, and the other end is installed on the drug delivery pump. The drug delivery pump is connected to the spray pipe, and the spray pipe is equipped with a nozzle.

[0007] As an improvement, the bottom of the medicine storage tank has a funnel-shaped structure, and the medicine outlet at the bottom of the medicine storage tank is connected to a pipe through a solenoid valve. The solenoid valve controls the amount of medicine dispensed, thereby controlling the mixing ratio, which can be preset.

[0008] As an improvement, a flow meter is installed on the solenoid valve. The flow meter is connected to the solenoid valve switch and measures the amount of liquid flowing through it. When the flow rate reaches a preset amount, the solenoid valve is closed.

[0009] As an improvement, the bend is an arc-shaped pipe with its end fitting against the wall of the mixing tank. The function of the bend is to provide a force for the freshly mixed liquid to circulate along the tank wall, thus performing initial mixing as the liquid falls.

[0010] As an improvement, the mixing tank is a cylindrical tank with an opening at the top, and a stirring motor is provided at the bottom of the mixing tank. A stirring plate is sleeved on the rotating shaft of the stirring motor, and the medicine is further mixed by stirring with the stirring motor.

[0011] As an improvement, the stirring plate is provided with several turbulence holes, and the array of turbulence holes is distributed on the stirring plate. The turbulence holes can not only improve the stirring efficiency, but also reduce the resistance to the rotation of the stirring plate.

[0012] As an improvement, the outlet pipe extends from the top of the mixing tank, and the bottom of the outlet pipe is higher than the highest point of the stirring plate. The outlet pipe draws in the supernatant, thus avoiding excessive residue in the liquid from clogging the nozzle.

[0013] As an improvement, the drug delivery pump is a plunger pump equipped with a frequency converter, and a pressure sensor is installed inside the spray pipe. The drug delivery pump is adjusted based on the measurement data of the pressure sensor to always maintain a constant internal pressure in the pipeline.

[0014] As an improvement, the number of nozzles is several and symmetrically distributed at equal intervals at the bottom of the spray pipe. The symmetrically distributed nozzles make watering more convenient and efficient for large-scale planting.

[0015] As an improvement, the mixing structure and spraying structure are connected to the main control system, which is connected to a flow meter, solenoid valve, stirring motor, drug delivery pump and pressure sensor. The main control system is also equipped with a communication module to upload operation data to the cloud platform and support remote viewing of equipment status and adjustment of parameters via mobile APP.

[0016] Compared with existing technologies, the advantages of this invention are as follows: This system achieves precise drug-liquid ratio through solenoid valves and flow meters; the curved pipe circulation and stirring plate turbulence holes ensure efficient mixing; the drug delivery pump, in conjunction with a pressure sensor, maintains constant pressure delivery to avoid nozzle clogging; the outlet pipe extracts supernatant to ensure fluid purity; symmetrical nozzles optimize coverage efficiency; the main control system integrates intelligent monitoring and cloud-based remote management, significantly improving mixing uniformity, spray consistency, and ease of operation. It is suitable for large-scale precision agricultural spraying operations, reducing manual intervention and improving drug utilization and operational efficiency. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solution of this utility model and do not constitute a limitation on the technical solution of this utility model.

[0018] Figure 1 Structural schematic diagrams provided for embodiments of this application;

[0019] Figure 2 A perspective view provided for an embodiment of this application;

[0020] Figure 3 A front view provided for an embodiment of this application;

[0021] Figure 4 A top view provided for an embodiment of this application;

[0022] Figure 5 A cross-sectional view of section AA provided for an embodiment of this application;

[0023] Figure 6 A diagram showing the distribution of turbulence holes provided for embodiments of this application;

[0024] Figure 7 Three-dimensional representations provided for embodiments of this application Figure 2 ;

[0025] Figure 8 A system block diagram provided for embodiments of this application.

[0026] The components include: 1. Mixing structure; 11. Storage tank; 111. Solenoid valve; 112. Flow meter; 12. Injection port; 13. Discharge port; 14. Pipeline; 15. Tee; 16. Delivery pump; 17. Bend; 18. Mixing tank; 19. Stirring plate; 191. Stirring motor; 192. Turbulence hole; 2. Spraying structure; 21. Discharge pipe; 22. Delivery pump; 23. Spray pipe; 231. Pressure sensor; 24. Nozzle; 3. Main control system; 31. Communication module. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this application have the meaning of establishing electrical connection. The specific meaning needs to be understood in conjunction with the context.

[0031] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0032] like Figures 1-8 A spraying system with automatic drug mixing and constant pressure delivery includes a drug mixing structure 1 and a spraying structure 2. The drug mixing structure 1 includes a drug storage tank 11, with a drug injection hole 12 at the top and a drug outlet hole 13 at the bottom. There are two drug storage tanks 11, which are connected by a pipe 14 and a tee 15. The tee 15 is connected to a bend pipe 17 via a drug delivery pump 16. The bend pipe 17 is located at the top of a mixing tank 18, and a stirring plate 19 is provided inside the mixing tank 18.

[0033] The spray structure 2 includes a liquid outlet pipe 21, one end of which is connected to the mixing tank 18, and the other end is installed on the drug delivery pump 22. The drug delivery pump 22 is connected to the spray pipe 23, and the spray pipe 23 is equipped with a nozzle 24.

[0034] As an improvement, the bottom of the medicine storage box 11 is a funnel-shaped structure. The medicine outlet 13 at the bottom of the medicine storage box 11 is connected to the pipe 14 through the solenoid valve 111. The solenoid valve controls the amount of medicine dispensed, thereby controlling the mixing ratio, which can be preset.

[0035] As an improvement, a flow meter 112 is installed on the solenoid valve 111. The flow meter 112 is connected to the solenoid valve 111 switch. The flow meter measures the amount of liquid flowing through it. When the flow rate reaches a preset amount, the solenoid valve is closed.

[0036] As an improvement, the bent pipe 17 is an arc-shaped pipe, with its end attached to the wall of the mixing tank 18. The function of the bent pipe is to provide a force for the freshly mixed liquid to circulate along the tank wall, thus performing initial mixing as the liquid falls.

[0037] As an improvement, the mixing tank 18 is a cylindrical tank with an opening at the top. A stirring motor 191 is provided at the bottom of the mixing tank 18, and a stirring plate 19 is sleeved on the rotating shaft of the stirring motor 191. The stirring motor further mixes the medicine liquid.

[0038] As an improvement, the stirring plate 19 is provided with a number of turbulence holes 192, and the turbulence holes 192 are arrayed on the stirring plate 19. The turbulence holes can not only improve the stirring efficiency, but also reduce the resistance to the rotation of the stirring plate.

[0039] As an improvement, the liquid outlet pipe 21 extends from the top of the mixing tank 18, and the bottom of the liquid outlet pipe 21 is higher than the highest point of the stirring plate 19. The liquid outlet pipe draws in the supernatant, which avoids excessive residue in the liquid from clogging the nozzle.

[0040] As an improvement, the drug delivery pump 22 is a plunger pump equipped with a frequency converter, and a pressure sensor 231 is installed inside the spray pipe 23. The drug delivery pump is adjusted according to the measurement data of the pressure sensor to always maintain a constant internal pressure in the pipeline.

[0041] As an improvement, the number of nozzles 24 is several, and they are symmetrically distributed at equal intervals at the bottom of the spray pipe 23. The symmetrically distributed nozzles 24 make watering more convenient and efficient for large-scale planting.

[0042] As an improvement, the mixing structure 1 and the spraying structure 2 are connected to the main control system 3. The main control system 3 is connected to the flow meter 112, the solenoid valve 111, the stirring motor 191, the drug delivery pump 22 and the pressure sensor 231. The main control system 3 is also equipped with a communication module 31 to upload the operation data to the cloud platform and support remote viewing of equipment status and adjustment of parameters via a mobile APP. Example

[0043] This embodiment details the workflow and the collaborative principle of each component of a spray system with automatic drug mixing and constant pressure delivery, as follows:

[0044] Drug injection and proportion control stage

[0045] Users inject different medications (such as medication A and medication B) into the two medication storage tanks 11 through the injection port 12 on the top of the storage tank 11. The bottom of the storage tank 11 is designed with a funnel-shaped structure to facilitate complete discharge of the medication. Its bottom outlet port 13 is connected to the pipeline 14 through a solenoid valve 111. The solenoid valve 111 is a normally closed electric ball valve (model: DN15-24V) with a fast opening and closing function (response time ≤0.2s). After the flow parameters are preset by the main control system 3, the dispensing amount can be accurately controlled. The flow meter 112 (model: LWGY-15 turbine flow meter, accuracy ±0.5%) installed on the solenoid valve 111 monitors the volume of medication flowing through the pipeline 14 in real time. When the flow rate reaches the preset value, the flow meter 112 sends a closing signal to the solenoid valve 111 to stop the medication supply. For example, if the ratio of drug A to drug B is 1:2, the main control system 3 sets the flow rate of solenoid valve 111-A (connected to drug storage tank 11-A) to 10L and the flow rate of solenoid valve 111-B (connected to drug storage tank 11-B) to 20L. When the flow meter 112-B detects that 20L of drug solution has passed through, it immediately closes the solenoid valve 111-B to complete the accurate ratio.

[0046] Initial mixing and delivery stage of the drug solution

[0047] The prepared medicine solution is collected through pipe 14 to a tee 15 (model: 304 stainless steel tee connector, specification DN15). The outlet of tee 15 is connected to a delivery pump 16 (model: CB-B6 gear pump, flow rate 6L / min, pressure 0.6MPa). The delivery pump 16 pressurizes and delivers the mixed medicine solution to a bend 17 (arc-shaped pipe, radius of curvature R=50mm). The end of the bend 17 is tightly fitted against the wall of the mixing tank 18 (top-open cylindrical tank, material: 304 stainless steel, volume: 50L). The medicine solution flows down along the tank wall, using fluid kinetic energy to achieve preliminary mixing, avoiding direct impact to the bottom of the tank which could cause splashing or stratification. For example, when the delivery pump 16 delivers the medicine solution at a flow rate of 6L / min, the medicine solution enters the mixing tank 18 tangentially along the bend 17, forming a spiral flow, which improves the preliminary mixing efficiency by about 30% compared to direct injection.

[0048] Deep mixing stage of drug solution

[0049] A stirring motor 191 (model: Y2-90S-4 three-phase asynchronous motor, power: 1.1kW, speed: 1400r / min) is installed at the bottom of the mixing tank 18. A stirring plate 19 (material: 304 stainless steel, size: φ200mm×10mm) is fitted onto its shaft. The stirring plate 19 has an array of turbulence-inducing holes 192 (hole diameter: φ10mm, spacing: 20mm). When the stirring motor 191 drives the stirring plate 19 to rotate, the turbulence-inducing holes 192 divide the liquid flow into multiple fine streams, increasing the contact area between the liquid and the drug, while reducing stirring resistance (approximately 40% lower than a non-porous stirring plate). During stirring, the main control system 3 automatically sets the stirring time (e.g., 3 minutes) based on the total liquid volume (e.g., 30L) fed back by the flow meter 112, ensuring thorough and uniform mixing of the liquid. For example, after the stirring motor 191 rotates at 1400r / min for 3 minutes, the coefficient of variation (CV) of the liquid concentration decreases from the initial 15% to ≤5%, meeting the requirements for precise application.

[0050] Constant pressure delivery and spraying stage

[0051] The uniformly mixed liquid medicine is introduced into the mixing tank 18 from the top through the outlet pipe 21 (PVC material, inner diameter φ25mm). The bottom of the outlet pipe 21 is 50mm higher than the highest point of the stirring plate 19 to ensure that only the supernatant is drawn in, avoiding the intake of bottom sediment that may clog the nozzle 24. The outlet pipe 21 is connected to the drug delivery pump 22 (model: 3RB series plunger pump, flow rate 0-10L / min adjustable, pressure 0-1.0MPa adjustable). The drug delivery pump 22 is equipped with a frequency converter (model: VFD007B21A, power 1.5kW), which can adjust the speed in real time according to the pipeline pressure feedback from the pressure sensor 231 (model: MIK-P300 diffused silicon pressure transmitter, range 0-1.0MPa, accuracy ±0.25%). For example, when the pressure inside the spray pipe 23 drops to 0.4 MPa, the pressure sensor 231 sends a signal to the main control system 3. The main control system 3 then uses a frequency converter to increase the speed of the pesticide delivery pump 22 from 800 r / min to 1000 r / min, restoring the pressure to the preset value of 0.5 MPa. The spray pipe 23 (made of 304 stainless steel, 5m in length) has four equally spaced and symmetrically distributed nozzles 24 (model: fan-shaped spray nozzle, model XP120-04, spray angle 120°, flow rate 1.2 L / min) at its bottom, ensuring uniform pesticide coverage of the crop. For example, in a 5m wide field, the four nozzles 24, symmetrically distributed at 0.5m intervals, can achieve uniform spraying across the entire area, with a coverage efficiency of over 95%.

[0052] Intelligent control and data transmission stage

[0053] The main control system 3 (model: Siemens S7-1200 PLC, equipped with a 10-inch touchscreen) collects data in real time from the flow meter 112, solenoid valve 111, stirring motor 191, pesticide delivery pump 22, and pressure sensor 231, and uploads the operational data (such as flow rate, pressure, stirring time, and equipment status) to the cloud platform via the communication module 31 (model: USR-G780 4G DTU). Users can remotely view the equipment's operating status and adjust parameters (such as modifying the pesticide solution ratio and setting pressure values) via a mobile APP (such as the "Smart Plant Protection" APP). For example, if a user finds that the dosage of pesticide B needs to be increased in a certain plot, they can change the preset flow rate of solenoid valve 111-B from 20L to 25L via the APP, and the main control system 3 will immediately execute the new parameters without on-site operation.

[0054] Implementation effect

[0055] This embodiment achieves a comprehensive improvement in the uniformity of pesticide mixing (CV value ≤ 5%), pressure stability (fluctuation ± 0.05 MPa), and intelligent operation (remote monitoring) through a three-stage mixing mechanism consisting of precise proportioning in dual pesticide tanks 11, initial mixing in curved pipes 17, and deep mixing in stirring plates 19, as well as variable frequency constant pressure control in the pesticide delivery pump 22. Compared with traditional spraying systems, it increases efficiency by 50% and reduces pesticide waste by 30%, making it suitable for precision plant protection operations in orchards, farmland, greenhouses, and other scenarios.

[0056] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A spray system with automatic mixing and constant pressure delivery of liquid medicine, comprising a mixing structure (1) and a spraying structure (2), characterized in that: The mixing structure (1) includes a drug storage tank (11), with a drug injection hole (12) at the top and a drug outlet hole (13) at the bottom. There are two drug storage tanks (11), which are connected by a pipe (14) and a tee (15). The tee (15) is connected to a bend pipe (17) via a drug delivery pump (16). The bend pipe (17) is located at the top of the mixing tank (18), and a stirring plate (19) is provided inside the mixing tank (18). The spray structure (2) includes a liquid outlet pipe (21), one end of which is connected to the mixing tank (18), and the other end is installed on the drug delivery pump (22). The drug delivery pump (22) is connected to the spray pipe (23), and the spray pipe (23) is equipped with a nozzle (24).

2. The spray system with automatic mixing and constant pressure delivery of the liquid medicine according to claim 1, characterized in that: The bottom of the medicine storage box (11) is a funnel-shaped structure, and the medicine outlet (13) at the bottom of the medicine storage box (11) is connected to the pipe (14) through the solenoid valve (111).

3. A spray system with automatic mixing and constant pressure delivery of liquid medicine according to claim 2, characterized in that: A flow meter (112) is installed on the solenoid valve (111), and the flow meter (112) is connected to the solenoid valve (111) switch.

4. A spray system with automatic mixing and constant pressure delivery of liquid medicine according to claim 1, characterized in that: The bend (17) is an arc-shaped pipe, and the end of the bend (17) is attached to the wall of the mixing tank (18).

5. A spray system with automatic mixing and constant pressure delivery of liquid medicine according to claim 1, characterized in that: The mixing tank (18) is a cylindrical tank with an opening at the top. A stirring motor (191) is provided at the bottom of the mixing tank (18), and a stirring plate (19) is sleeved on the shaft of the stirring motor (191).

6. A spray system with automatic mixing and constant pressure delivery of liquid medicine according to claim 1, characterized in that: The stirring plate (19) is provided with a number of turbulence holes (192), and the turbulence holes (192) are arrayed on the stirring plate (19).

7. A spray system with automatic mixing and constant pressure delivery of liquid medicine according to claim 1, characterized in that: The outlet pipe (21) extends from the top of the mixing tank (18), and the bottom of the outlet pipe (21) is higher than the highest point of the stirring plate (19).

8. A spray system with automatic mixing and constant pressure delivery of liquid medicine according to claim 1, characterized in that: The drug delivery pump (22) is a plunger pump equipped with a frequency converter, and a pressure sensor (231) is installed inside the spray pipe (23).

9. A spray system with automatic mixing and constant pressure delivery of liquid medicine according to claim 1, characterized in that: The number of nozzles (24) is several, and they are symmetrically distributed at equal intervals at the bottom of the spray pipe (23).

10. The spray system according to claim 1, characterized in that: The mixing structure (1) and spraying structure (2) are connected to the main control system (3). The main control system (3) is connected to the flow meter (112), solenoid valve (111), stirring motor (191), drug delivery pump (22) and pressure sensor (231). The main control system (3) is also equipped with a communication module (31).

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