A precise variable pesticide application system based on electromagnetic valve PWM and water pump PWM double closed loop flow control

Abstract

This utility model relates to the field of agricultural planting technology and discloses a precision variable pesticide application system based on dual closed-loop flow control of solenoid valve PWM and water pump PWM. The system includes a water tank, a walking frame fixedly connected to the bottom of the water tank, a water pump fixedly connected to the top of the walking frame, and a water delivery pipe fixedly connected to the output end of the water pump. A pressure sensor is installed inside the water delivery pipe. This utility model has the following advantages and effects: by adjusting the valve opening time ratio per unit time, the average flow rate through the valve is precisely controlled, thus forming a dual closed-loop flow control. This process, through water pump pressure stabilization and solenoid valve precision control, improves the control precision of agricultural variable pesticide application to an industrial level, while ensuring stability in complex field environments. This allows for precise application to the required areas. Furthermore, the diversion pipe assembly and nozzles can be separated from the water delivery pipe, and the bottom can be disassembled from the mounting base, allowing for replacement in case of damage.

Description

Technical Field

[0001] This utility model relates to the field of agricultural planting technology, and in particular to a precision variable application system based on dual closed-loop flow control of electromagnetic valve PWM and water pump PWM. Background Technology

[0002] Agriculture is an industry that uses the growth and development patterns of plants and animals to obtain products through artificial cultivation. Planting refers to plant cultivation, which includes the cultivation of various crops, trees, fruit trees, flowers, medicinal and ornamental plants. Pesticides refer to chemical agents used in agriculture to prevent and control pests and diseases and regulate plant growth. Pesticides are usually sprayed on crops after agricultural planting is completed.

[0003] In the prior art, Chinese Patent Publication No. CN213095693U discloses a pesticide spraying device for agricultural planting, including a pesticide spraying device body. A movable base is fixedly connected to the bottom of the pesticide spraying device body, and a caster wheel is fixedly connected to the bottom of the movable base. A push rod is fixedly connected to the top of the movable base, and a water inlet pipe is fixedly connected to the top of the pesticide spraying device body. This pesticide spraying device for agricultural planting facilitates the thorough mixing of pesticides and water to meet the needs of pesticide spraying. It also prevents pesticide sedimentation after a period of standing, thus improving the effectiveness and practicality of the device. The sprayed pesticide can effectively control pests and diseases and regulate plant growth, satisfying the user's needs for spraying pesticides on crops.

[0004] However, in actual use, the existing spraying device has weak control accuracy of flow rate. When the pesticide concentration error is too large, it may cause pesticide damage to crops or failure of control. During farmland operation, the pressure of the pipeline will fluctuate with the change of terrain height, affecting the flow coefficient. Therefore, a precise variable spraying system based on dual closed-loop flow control of electromagnetic valve PWM and water pump PWM is needed. Utility Model Content

[0005] The purpose of this invention is to provide a precision variable flow control system based on dual closed-loop flow control of electromagnetic valve PWM and water pump PWM, which ensures stability in complex field environments and thus achieves precise application of pesticides to the required locations.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a precise variable flow control system based on dual closed-loop flow control of electromagnetic valve PWM and water pump PWM, comprising a water tank, a walking frame fixedly connected to the bottom of the water tank, a water pump fixedly connected to the top of the walking frame, a water delivery pipe fixedly connected to the output end of the water pump, a pressure sensor installed inside the water delivery pipe, a diverter pipe inserted into the top of the water delivery pipe, an outlet pipe provided on the outer surface of the diverter pipe, an electromagnetic valve fixedly connected to the outer surface of the outlet pipe, a flow meter fixedly connected inside the outlet pipe, a nozzle fixedly connected to one end of the outlet pipe, fixed rods fixedly connected to both ends of the diverter pipe, and a mounting base fixedly connected to the top of the walking frame.

[0007] By adopting the above technical solution, the system's basic pressure is set according to the viscosity and density of the pesticide solution. The pressure sensor collects the actual pressure value of the water supply pipe in real time. The error is calculated by the PID controller of the water pump, and the PWM duty cycle of the water pump is output. The speed of the water pump is then adjusted to maintain the pressure of the main pipeline stable at the set value. The flow meter measures the actual instantaneous flow of the nozzle in real time. The target instantaneous flow and the actual instantaneous flow are compared and the error is calculated. The controller outputs a PWM duty cycle signal based on the error magnitude and trend of the PID algorithm. The PWM signal drives the opening and closing of the solenoid valve. By adjusting the proportion of valve opening time per unit time, the average flow through the valve is precisely controlled, thus forming a dual closed-loop flow control. This process, through water pump pressure stabilization and solenoid valve precision control, improves the control accuracy of agricultural variable pesticide application to the industrial level, while ensuring stability in complex field environments. This allows for precise application of pesticides to the required locations. At the same time, the diversion pipe assembly and nozzles can be separated from the water supply pipe, and the bottom can be disassembled from the mounting base for replacement when damaged.

[0008] A further feature of this invention is that the mounting base is internally threaded with bolts, and the number of water outlet pipes is five.

[0009] By adopting the above technical solution, bolts connect the mounting base and the fixing rod, thereby fixing the shunt pipe in place.

[0010] A further feature of this invention is that a water pump controller is fixedly connected to one side of the water tank, and a solenoid valve controller is provided on one side of the water pump controller.

[0011] By adopting the above technical solution, both the water pump controller and the solenoid valve controller are PID controllers, which control the flow regulation of the two loops.

[0012] A further feature of this invention is that a tank cover is snapped onto the top of the water tank, and a locking block is fixedly connected to the bottom of the tank cover.

[0013] By adopting the above technical solution, the tank cover and the water tank are installed by snap-fitting.

[0014] A further feature of this invention is that a slot is fixedly connected to the top of the inner wall of the water tank, and a slot is fixedly connected to the bottom of the inner wall of the water tank.

[0015] By adopting the above technical solution, the card slot and the card block are engaged, and the inner wall of the slot is rectangular.

[0016] A further feature of this invention is that a filter screen is inserted into the inner wall of the slot, and a second slot is fixedly connected to the bottom of the box cover.

[0017] By adopting the above technical solution, the filter screen is inserted between the slot and the second slot, which can filter and block impurities from entering the water pump.

[0018] A further feature of this invention is that a motor is fixedly connected to the bottom of the box cover, and the motor is a waterproof motor.

[0019] By adopting the above technical solution, the motor is started when the pesticide is sprayed, and the motor provides power for mixing.

[0020] A further feature of this invention is that a stirring shaft is fixedly connected to the output end of the motor, and blades are fixedly connected to the outer surface of the stirring shaft.

[0021] By adopting the above technical solution, the rotation of the stirring shaft drives the blades to stir, thereby making the pesticide and water mix more evenly.

[0022] A further feature of this invention is that the number of blades is four, and the four blades are of the same size.

[0023] By adopting the above technical solution, the leaves are thoroughly agitated, and the concentration of the sprayed pesticides can be controlled more precisely.

[0024] A further feature of this invention is that a suction pipe is fixedly connected to one end of the water pump, and the suction pipe extends into the interior of the water tank.

[0025] By adopting the above technical solution, the suction pipe draws pesticides from inside the water tank, and the pesticides entering the suction pipe do not carry other impurities.

[0026] The beneficial effects of this utility model are:

[0027] 1. This utility model, through the coordinated arrangement of a water tank, a walking frame, a water pump, a water delivery pipe; a pressure sensor, a diversion pipe, a water outlet pipe, a solenoid valve, a flow meter, a nozzle, a fixing rod, and a mounting base, enables the device to set the system's base pressure based on the viscosity and density of the liquid. The pressure sensor collects the actual pressure value of the water delivery pipe in real time. The PID controller of the water pump calculates the error, outputs the PWM duty cycle of the water pump, and then adjusts the pump speed to maintain the main pipeline pressure stable at the set value. The flow meter measures the actual instantaneous flow rate of the nozzle in real time. The target instantaneous flow rate and the actual instantaneous flow rate are compared, and the error is calculated to control the flow. The device outputs a PWM duty cycle signal based on the error magnitude and trend using a PID algorithm. The PWM signal drives the solenoid valve to open and close. By adjusting the valve opening time ratio per unit time, the average flow rate through the valve is precisely controlled, thus forming a dual closed-loop flow control. This process, through water pump pressure stabilization and solenoid valve precision control, improves the control accuracy of agricultural variable spraying to an industrial level, while ensuring stability in complex field environments. This allows for precise spraying to the required areas. Furthermore, the diversion pipe assembly and nozzles can be separated from the water supply pipe, and the bottom can be disassembled from the mounting base for replacement in case of damage.

[0028] 2. This utility model, through the coordinated arrangement of bolts, a water pump controller, a solenoid valve controller, a tank cover, a locking block, a locking groove, a slot, a filter screen, a second slot, a motor, a stirring shaft, blades, and a suction pipe, enables the device to be used such that, during use, the bolts connect the mounting base and the fixing rod, thereby fixing the diversion pipe in place; the tank cover and the water tank are secured by locking blocks; the filter screen is inserted between the slot and the second slot, which can filter and block impurities from entering the water pump; the rotation of the stirring shaft drives the blades to stir, thereby making the pesticide and water mix more evenly, and the blades stir thoroughly, resulting in more precise control of the sprayed pesticide concentration. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of this utility model;

[0031] Figure 2 This is a schematic diagram of the water pipe structure of this utility model;

[0032] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A;

[0033] Figure 4 This is a schematic diagram of the water outlet pipe structure of this utility model.

[0034] In the diagram, 1. Water tank; 2. Walking frame; 3. Water pump; 4. Water delivery pipe; 5. Pressure sensor; 6. Diverter pipe; 7. Outlet pipe; 8. Solenoid valve; 9. Flow meter; 10. Nozzle; 11. Fixing rod; 12. Mounting base; 13. Bolt; 14. Water pump controller; 15. Solenoid valve controller; 16. Tank cover; 17. Locking block; 18. Locking groove; 19. Slot; 20. Filter screen; 21. Second slot; 22. Motor; 23. Stirring shaft; 24. Blade; 25. Suction pipe. Detailed Implementation

[0035] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0036] A precise variable flow control system based on dual closed-loop flow control of solenoid valve PWM and water pump PWM includes the following embodiments:

[0037] Example 1:

[0038] Reference Figure 1-4 The bottom of the water tank 1 is fixedly connected to the walking frame 2, the top of the walking frame 2 is fixedly connected to the water pump 3, the output end of the water pump 3 is fixedly connected to the water supply pipe 4, the inside of the water supply pipe 4 is equipped with a pressure sensor 5, the top of the water supply pipe 4 is inserted with a diversion pipe 6, the outer surface of the diversion pipe 6 is provided with a water outlet pipe 7, the outer surface of the water outlet pipe 7 is fixedly connected to the solenoid valve 8, the inside of the water outlet pipe 7 is fixedly connected to the flow meter 9, one end of the water outlet pipe 7 is fixedly connected to a nozzle 10, both ends of the diversion pipe 6 are fixedly connected to a fixing rod 11, and the top of the walking frame 2 is fixedly connected to a mounting base 12.

[0039] Specifically, based on the viscosity and density of the pesticide solution, the system base pressure is set. The pressure sensor collects the actual pressure value of the water supply pipe 4 in real time. The error is calculated by the PID controller of the water pump 3, and the PWM duty cycle of the water pump 3 is output. The speed of the water pump 3 is then adjusted to maintain the pressure of the main pipeline stable at the set value. The flow meter 9 measures the actual instantaneous flow of the nozzle 10 in real time. The target instantaneous flow and the actual instantaneous flow are compared and the error is calculated. The controller outputs a PWM duty cycle signal based on the error magnitude and trend of the PID algorithm. The PWM signal drives the opening and closing of the solenoid valve 8. By adjusting the opening time ratio of the valve per unit time, the average flow through the valve is precisely controlled, thus forming a dual closed-loop flow control. This process, through the pressure stabilization of the water pump 3 and the fine control of the solenoid valve 8, improves the control accuracy of agricultural variable pesticide application to the industrial level, while ensuring stability in complex field environments. This allows for precise application of pesticides to the areas that need to be applied. At the same time, the diversion pipe assembly and the nozzle 10 can be separated from the water supply pipe 4, and the bottom can be disassembled from the mounting base 12. When damaged, they can be replaced.

[0040] Example 2:

[0041] Reference Figure 1-4 The mounting base 12 has internal threaded connections with bolts 13. There are five water outlet pipes 7. A water pump controller 14 is fixedly connected to one side of the water tank 1. A solenoid valve controller 15 is provided on one side of the water pump controller 14. A tank cover 16 is snapped onto the top of the water tank 1. A locking block 17 is fixedly connected to the bottom of the tank cover 16. A slot 18 is fixedly connected to the top of the inner wall of the water tank 1. A slot 19 is fixedly connected to the bottom of the inner wall of the water tank 1. A filter screen 20 is inserted into the inner wall of the slot 19. A second slot 21 is fixedly connected to the bottom of the tank cover 16. A motor 22 is fixedly connected to the bottom of the tank cover 16. The motor 22 is a waterproof motor. A stirring shaft 23 is fixedly connected to the output end of the motor 22. A blade 24 is fixedly connected to the outer surface of the stirring shaft 23. There are four blades 24, and the four blades 24 are the same size. A suction pipe 25 is fixedly connected to one end of the water pump 3. The suction pipe 25 extends into the interior of the water tank 1.

[0042] Specifically, bolt 13 connects mounting base 12 and fixing rod 11, thereby fixing the diversion pipe 6. Both water pump controller 14 and solenoid valve controller 15 are PID controllers, controlling the flow regulation of two loops. The tank cover 16 is installed in conjunction with water tank 1 by a locking block 17. The locking slot 18 and locking block 17 are engaged. The inner wall of slot 19 is rectangular. The filter screen 20 is inserted between slot 19 and second slot 21, which can filter and block impurities from entering water pump 3. When the pesticide is sprayed, motor 22 is started. Motor 22 provides power for mixing. The stirring shaft 23 rotates and drives blade 24 to stir, thereby making the pesticide and water mix more evenly. The blade 24 stirs thoroughly, and the concentration of the sprayed pesticide is more accurately controlled. The suction pipe 25 draws pesticide from inside water tank 1. The pesticide entering the suction pipe 25 does not carry other impurities.

[0043] In this invention, the system's base pressure is set based on the viscosity and density of the liquid medicine. A pressure sensor collects the actual pressure value of the water supply pipe 4 in real time. The error is calculated by the PID controller of the water pump 3, which outputs the PWM duty cycle of the water pump 3. The speed of the water pump 3 is then adjusted to maintain the main pipeline pressure at the set value. The flow meter 9 measures the actual instantaneous flow rate of the nozzle 10 in real time. The target instantaneous flow rate and the actual instantaneous flow rate are compared, and the error is calculated. The controller outputs a PWM duty cycle signal based on the magnitude and trend of the error using a PID algorithm. This PWM signal drives the opening and closing of the solenoid valve 8. By adjusting the valve's opening time ratio per unit time, the average flow rate through the valve is precisely controlled, thus forming a dual closed-loop flow control. This process utilizes the pressure stabilization of the water pump 3 and the solenoid valve... The valve 8 precision control process elevates the control accuracy of agricultural variable spraying to an industrial level, while ensuring stability in complex field environments. This allows for precise application of pesticides to the required areas. The diversion pipe assembly and nozzle 10 can be separated from the water supply pipe 4, and the bottom can be disassembled from the mounting base 12 for replacement in case of damage. Bolts 13 connect the mounting base 12 and the fixing rod 11, thus securing the diversion pipe 6. The tank cover 16 is snapped into the water tank 1 using a locking block 17. The filter screen 20 is inserted between slot 19 and the second slot 21, filtering and blocking impurities from entering the water pump 3. The rotating agitator shaft 23 drives the blades 24 to agitate, resulting in a more uniform mixture of pesticide and water. The thorough agitation by the blades 24 ensures more precise control of the sprayed pesticide concentration.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precise variable flow control system based on dual closed-loop flow control of solenoid valve PWM and water pump PWM, comprising a water tank (1), characterized in that: The bottom of the water tank (1) is fixedly connected to a walking frame (2), the top of the walking frame (2) is fixedly connected to a water pump (3), the output end of the water pump (3) is fixedly connected to a water supply pipe (4), a pressure sensor (5) is installed inside the water supply pipe (4), a diversion pipe (6) is inserted into the top of the water supply pipe (4), a water outlet pipe (7) is installed on the outer surface of the diversion pipe (6), a solenoid valve (8) is fixedly connected to the outer surface of the water outlet pipe (7), a flow meter (9) is fixedly connected inside the water outlet pipe (7), a nozzle (10) is fixedly connected to one end of the water outlet pipe (7), a fixing rod (11) is fixedly connected to both ends of the diversion pipe (6), and a mounting base (12) is fixedly connected to the top of the walking frame (2).

2. The precise variable flow control system based on dual closed-loop flow control of solenoid valve PWM and water pump PWM as described in claim 1, characterized in that: The mounting base (12) is internally threaded with bolts (13), and the number of water outlet pipes (7) is five.

3. The precise variable flow control system based on dual closed-loop flow control of solenoid valve PWM and water pump PWM as described in claim 1, characterized in that: A water pump controller (14) is fixedly connected to one side of the water tank (1), and a solenoid valve controller (15) is provided on one side of the water pump controller (14).

4. The precise variable flow control system based on dual closed-loop flow control of solenoid valve PWM and water pump PWM as described in claim 1, characterized in that: The top of the water tank (1) is fitted with a tank cover (16), and the bottom of the tank cover (16) is fixedly connected with a locking block (17).

5. A precise variable-rate application system based on dual closed-loop flow control of solenoid valve PWM and water pump PWM as described in claim 4, characterized in that: The top of the inner wall of the water tank (1) is fixedly connected with a slot (18), and the bottom of the inner wall of the water tank (1) is fixedly connected with a slot (19).

6. A precise variable-rate pesticide application system based on dual closed-loop flow control of solenoid valve PWM and water pump PWM as described in claim 5, characterized in that: A filter screen (20) is inserted into the inner wall of the slot (19), and a second slot (21) is fixedly connected to the bottom of the box cover (16).

7. A precise variable-rate pesticide application system based on dual closed-loop flow control of solenoid valve PWM and water pump PWM as described in claim 6, characterized in that: A motor (22) is fixedly connected to the bottom of the box cover (16), and the motor (22) is a waterproof motor.

8. A precise variable-rate pesticide application system based on dual closed-loop flow control of solenoid valve PWM and water pump PWM as described in claim 7, characterized in that: The output end of the motor (22) is fixedly connected to a stirring shaft (23), and blades (24) are fixedly connected to the outer surface of the stirring shaft (23).

9. A precise variable-rate application system based on dual closed-loop flow control of solenoid valve PWM and water pump PWM as described in claim 8, characterized in that: The number of blades (24) is four, and the four blades (24) are the same size.

10. A precise variable-rate pesticide application system based on dual closed-loop flow control of solenoid valve PWM and water pump PWM as described in claim 1, characterized in that: One end of the water pump (3) is fixedly connected to a suction pipe (25), which extends into the interior of the water tank (1).

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