A knapsack sprayer pesticide real-time online mixing system and control method

Abstract

The application discloses a knapsack sprayer pesticide real-time online mixing system and a control method, which comprises a water tank, a pesticide tank, a flow control device, a pesticide mixing device, a spraying device and a man-machine interaction device; the flow control device comprises a micro diaphragm pump and a peristaltic pump, the micro diaphragm pump is connected with the water tank through a pipeline and is used for controlling water flow, the peristaltic pump is connected with the pesticide tank through a pipeline and is used for controlling concentrated pesticide liquid flow; the diaphragm pump and the peristaltic pump are respectively connected with the pesticide mixing device through pipelines, the pesticide mixing device is connected with the spraying device through a pipeline, and the man-machine interaction device is connected with the flow control device, the pesticide mixing device and the spraying device through electric signals. The application realizes sufficient mixing of water and pesticide through the structure of the pesticide mixing device, obtains pesticide water with more accurate concentration, does not need to set a stirring device, reduces pesticide mixing cost and is more economical and practical.

Description

Technical Field

[0001] This invention relates to the field of control technology for intelligent agricultural machinery, specifically to a real-time online pesticide mixing system and control method applied to a backpack two-phase flow sprayer. Background Technology

[0002] Agriculture is the foundation of our nation. Without chemical pesticides, losses due to pests, diseases, and weeds would reach approximately 30% of the total agricultural output value annually. Therefore, the use of chemical pesticides plays a crucial role in ensuring increased agricultural production. Modern agricultural pesticide application technology mainly consists of three parts: pesticides, application techniques, and application machinery. The development direction of agricultural pesticide application technology in my country lies in improving pesticide spraying efficiency, reducing pesticide usage, increasing pesticide adhesion to targets, minimizing pesticide pollution to humans and the environment, providing specific pesticide spraying and safe application technical specifications for specific crops and planting systems, and improving automation levels.

[0003] Currently, there are three main types of spray mixing devices both domestically and internationally: premixed spray mixing devices, jet spray mixing devices, and externally powered spray mixing devices. Using premixed spray mixing methods, operators may come into contact with pesticides during loading and mixing, posing a potential health hazard to the applicator. Furthermore, large quantities of premixed but unused pesticide solution result in waste and environmental pollution. Secondly, while jet spray mixing methods separate pesticides from water, avoiding direct contact with pesticides, these devices suffer from drawbacks such as large and unstable mixing ratios and low pressure ratios, limiting their widespread application. Finally, externally powered spray mixing methods require complex detection and computer control systems to continuously monitor changes in pressure, flow rate, and propulsion speed within the pipeline system. These systems are complex, require significant investment, and are difficult to operate and maintain, limiting their application to large-scale spraying machinery and resulting in a low market share in my country. In my country, the market share of backpack sprayers has reached 53 million units, accounting for 95%. Therefore, research on real-time online mixing systems and control methods for pesticides using backpack sprayers is crucial for improving the technical level of plant protection machinery, reducing the number of premixing operations during application, increasing pesticide utilization, avoiding direct contact between operators and pesticides, ensuring operator safety, reducing pesticide dosage, dynamically controlling pesticide application, and minimizing the environmental and human harm caused by excessive residual liquid dumping. Summary of the Invention

[0004] To address the technical problems existing in the prior art, the purpose of this invention is to design a real-time online pesticide mixing system and control method for backpack sprayers, which is applicable to modern agricultural machinery, has a simple structure, uniform pesticide mixing, and is easy to control. It can ensure that the sprayer completes pesticide mixing during operation, leaves no pesticide residue, and can dynamically adjust the application concentration, and can achieve a wide range and high mixing ratio.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A backpack sprayer pesticide real-time online mixing system includes a water tank, a pesticide tank, a flow control device, a mixing device, a spraying device, and a human-machine interface device. The flow control device includes a miniature diaphragm pump and a peristaltic pump. The miniature diaphragm pump is connected to the water tank via a pipe to control the water flow rate, and the peristaltic pump is connected to the pesticide tank via a pipe to control the concentrated pesticide flow rate. The diaphragm pump and the peristaltic pump are respectively connected to the mixing device via pipes. The mixing device is connected to the spraying device via a pipe. The human-machine interface device is electrically connected to the flow control device, the mixing device, and the spraying device.

[0007] Furthermore, the mixing device includes a water inlet, a pesticide inlet, and a mixing outlet; the water inlet and the mixing outlet are connected by valve body I, the pesticide inlet is connected to valve body II, and the connection between valve body I and valve body II is controlled by four solenoid valves. The four solenoid valves control four channels with different apertures for concentrated pesticide and water, respectively. The injection direction of the pesticide in mixing valve body II is perpendicular to the water flow direction and forms turbulence, thereby uniformly mixing water and pesticide in valve body II.

[0008] Furthermore, the spraying device includes a high-speed fan, an anemometer, and a two-phase flow nozzle. The high-speed fan and the two-phase flow nozzle are connected by a pipe, and the anemometer is installed on the pipe between the high-speed fan and the two-phase flow nozzle.

[0009] A real-time online pesticide mixing system for a backpack sprayer also includes a water level monitoring device, which includes a liquid level sensor I and a liquid level sensor II. The liquid level sensor I is used to monitor the water level in the water tank, and the liquid level sensor II is used to monitor the water level in the pesticide tank.

[0010] Furthermore, the human-machine interaction device includes a display screen, a controller, and a Bluetooth module. The controller is electrically connected to the flow control device, the mixing device, the spraying device, and the water level monitoring device, respectively.

[0011] Furthermore, the flow control device also includes a flow sensor, which is installed on the pipeline between the diaphragm pump and the mixing device.

[0012] Furthermore, a filter is installed on the pipe between the miniature diaphragm pump and the water tank.

[0013] A control method for a real-time online pesticide mixing system for a backpack sprayer includes the following steps:

[0014] S1. The controller of the real-time online pesticide mixing system for backpack sprayers collects the water flow rate into the mixing device in real time through a flow sensor.

[0015] S2. Based on the real-time wind pressure data collected by the anemometer, the speed of the high-speed fan is adjusted according to the wind pressure value set by the user.

[0016] S3. Based on the current water flow rate in the water tank and the mixing ratio set by the user, precisely control the opening and closing of the four solenoid valves of the mixing device and the drive output of the peristaltic pump.

[0017] S4. Based on the above steps, implement the spraying process of the backpack sprayer. Repeat the above steps when the mixing ratio or air pressure changes.

[0018] The beneficial effects of this invention are as follows:

[0019] 1) This invention achieves thorough mixing of water and medicine through the structure of the mixing device, resulting in a more precise concentration of the medicine solution. It eliminates the need for a stirring device, reducing mixing costs and making it more economical.

[0020] 2) The present invention designs a mixing device, including a main valve body, an auxiliary valve body, and four solenoid valves. The main valve body is for water supply and has four holes for connecting to the auxiliary valve body. The solenoid valves are installed on the auxiliary valve body to precisely control the flow rate of pesticides through different opening and closing methods.

[0021] 3) This invention designs a human-computer interaction device that monitors the liquid composition and current mixing ratio in each container through a display screen, controls the opening and closing of the solenoid valve in real time through buttons to change the mixing ratio, and uploads data to the mobile phone in real time through a Bluetooth module, thus achieving both control and data storage and analysis.

[0022] 4) The control method designed in this invention has a simple structure, avoids direct contact between the applicator and the pesticide, and optimizes the structure to make it suitable for the most widely used backpack sprayers on the market. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is the invention Figure 1 Schematic diagram of the mixing device for intermediate drugs;

[0025] Figure 3 This is a block diagram of the control principle of the present invention;

[0026] Figure 4 This is a flowchart of the method of the present invention;

[0027] In the diagram: 1. Water tank; 2. Liquid level sensor I; 3. Filter; 4. Miniature diaphragm pump; 5. Flow sensor; 6. Mixing device; 7. Medicine tank; 8. Liquid level sensor II; 9. Controller; 10. Peristaltic pump; 11. High-speed fan; 12. Anemometer; 13. Two-phase flow nozzle; 6-1. Water inlet; 6-2. Medicine inlet; 6-3. Solenoid valve I; 6-4. Solenoid valve II; 6-5. Solenoid valve III; 6-6. Solenoid valve IV; 6-7. Mixing outlet; 6-8. Valve body I; 6-9. Valve body II; 14. Display screen; 15. Bluetooth module. Detailed Implementation

[0028] The present invention will be further described and illustrated below with reference to specific embodiments. The technical features of each embodiment of the present invention can be combined without conflict.

[0029] like Figure 1 As shown, this embodiment is used for a real-time online pesticide mixing system and control method for backpack sprayers, including a water tank 1, a liquid level sensor I 2, a filter 3, a micro diaphragm pump 4, a flow sensor 5, a mixing device 6, a pesticide tank 7, a liquid level sensor II 8, a controller 9, a peristaltic pump 10, a high-speed fan 11, an anemometer 12, and a two-phase flow nozzle 13.

[0030] The invention will now be described in further detail.

[0031] The backpack sprayer pesticide real-time online mixing system includes a water tank, a pesticide tank, a mixing device, a water level monitoring device, a flow control device, a spraying device, and a human-machine interaction device.

[0032] The mixing device includes a water inlet 6-1, a drug inlet 6-2, solenoid valve I 6-3, solenoid valve II 6-4, solenoid valve III 6-5, solenoid valve IV 6-6, a mixing outlet 6-7, valve body I 6-8, and valve body II 6-9. During the operation of the mixing device, four solenoid valves control the liquid connection between valve body I and valve body II.

[0033] The water level monitoring device includes a liquid level sensor I for monitoring the water level in the water tank and a liquid level sensor II for monitoring the water level in the medicine tank.

[0034] The connections are as follows: the water tank, filter, check valve, small liquid pump, flow sensor, and water inlet of the mixing device are connected in sequence through pipes; the medicine tank, peristaltic pump, and medicine inlet of the mixing device are connected in sequence through pipes; the medicine outlet and the water inlet of the atomizing nozzle are connected through pipes; and the high-speed fan, anemometer, and air inlet of the atomizing nozzle are connected through pipes.

[0035] like Figure 3 As shown, the controller is connected to the liquid level sensor, flow sensor, and anemometer to form a negative feedback system. It interacts with the display screen and Bluetooth module (mobile phone Bluetooth) to control the operation of the miniature diaphragm pump, peristaltic pump, solenoid valve, and high-speed motor.

[0036] The control method for a real-time online pesticide mixing system for backpack sprayers includes the following steps:

[0037] like Figure 4 As shown, when the main switch is turned on, the entire control system starts. The remaining liquid volume is determined by the liquid level sensors in the pesticide concentration tank and the water tank, and this information is transmitted to the controller. The corresponding value is then displayed on the screen. The user inputs the set pesticide concentration and air pressure via buttons. The solenoid valve in the corresponding mixing device then opens, activating the high-speed fan. Next, a small liquid pump starts operating, circulating water. A flow sensor provides negative feedback to ensure stable water flow. Then, a peristaltic pump connected to the pesticide starts operating, introducing the pesticide solution into the mixing device for precise pesticide spraying. Finally, the pesticide is sprayed through a two-phase flow atomizing nozzle.

[0038] The mixing device has four solenoid valves that control four channels with different apertures for concentrated pesticides and water. By controlling their opening and closing, 15 different pesticide-to-water ratios can be accurately obtained, achieving a minimum ratio of 300:1 and a maximum ratio of 4500:1. Because the concentrated pesticide has a smaller aperture channel, it forms a local rapid turbulence when mixed with water, which makes the concentrated pesticide and water fully mixed, reducing the traditional mixing and stirring operations and the waiting time for pesticide mixing.

[0039] All data generated during the spraying process is transmitted to a mobile phone via Bluetooth for storage, facilitating subsequent recording and analysis.

[0040] When the crop being sprayed is different or the spraying area is different, adjust the pesticide concentration and air pressure via the display screen, and repeat the above steps until the spraying work is completed.

[0041] When the water level sensor I in the water tank detects that the water volume in the tank is lower than the set minimum water level, the liquid pump, peristaltic pump, solenoid valve, and high-speed fan will stop working, and the display screen will show that the water level is low. Please add water immediately.

[0042] When the liquid level sensor II detects that the volume of concentrated pesticide in the tank is lower than the set minimum water level, the liquid pump, peristaltic pump, solenoid valve, and high-speed fan will stop working, and the display screen will show that the concentrated pesticide is insufficient. Please replenish the concentrated pesticide immediately.

[0043] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, are included within the scope of protection of the present invention.

Claims

1. A control method for a real-time online pesticide mixing system for a backpack sprayer, characterized in that, The system includes a water tank, a medicine tank, a flow control device, a mixing device, a spraying device, and a human-machine interface device. The flow control device includes a miniature diaphragm pump and a peristaltic pump. The miniature diaphragm pump is connected to the water tank via a pipe to control the water flow rate, and the peristaltic pump is connected to the medicine tank via a pipe to control the flow rate of the concentrated medicine solution. The diaphragm pump and the peristaltic pump are respectively connected to the mixing device via pipes. The mixing device is connected to the spraying device via a pipe. The human-machine interface device is electrically connected to the flow control device, the mixing device, and the spraying device. The mixing device includes a water inlet, a pesticide inlet, and a mixing outlet. The water inlet and the mixing outlet are connected by a valve body I. The pesticide inlet is connected to a valve body II. The connection between valve body I and valve body II is controlled by four solenoid valves. The four solenoid valves control four channels with different apertures for concentrated pesticide and water, respectively. The injection direction of the pesticide in the mixing valve body II is perpendicular to the water flow direction and forms turbulence, thereby uniformly mixing water and pesticide in the valve body II. It also includes a water level monitoring device, which includes a liquid level sensor I and a liquid level sensor II. The liquid level sensor I is used to monitor the water level in the water tank, and the liquid level sensor II is used to monitor the water level in the medicine tank. The flow control device also includes a flow sensor, which is installed on the pipeline between the diaphragm pump and the mixing device. The method includes the following steps: S1. The controller of the real-time online pesticide mixing system for backpack sprayers collects the water flow rate into the mixing device in real time through a flow sensor. S2. Based on the real-time wind pressure data collected by the anemometer, the speed of the high-speed fan is adjusted according to the wind pressure value set by the user. S3. Based on the current water flow rate in the water tank and the mixing ratio set by the user, precisely control the opening and closing of the four solenoid valves of the mixing device and the drive output of the peristaltic pump. S4. Based on the above steps, implement the spraying process of the backpack sprayer. Repeat the above steps when the mixing ratio or air pressure changes.

2. The control method for a real-time online pesticide mixing system for a backpack sprayer according to claim 1, characterized in that, The spraying device includes a high-speed fan, an anemometer, and a two-phase flow nozzle. The high-speed fan and the two-phase flow nozzle are connected by a pipe, and the anemometer is installed on the pipe between the high-speed fan and the two-phase flow nozzle.

3. The control method for a real-time online pesticide mixing system for a backpack sprayer according to claim 1, characterized in that, The human-machine interaction device includes a display screen, a controller, and a Bluetooth module. The controller is electrically connected to the flow control device, the mixing device, the spraying device, and the water level monitoring device.

4. The control method for a real-time online pesticide mixing system for a backpack sprayer according to claim 1, characterized in that, A filter is installed on the pipe between the miniature diaphragm pump and the water tank.

Images