A wind pressure stabilization control system and control method for an air suction potato planter

Abstract

The present invention relates to a wind pressure stabilization control system and control method for an air suction potato planter, wherein the wind pressure stabilization control system for an air suction potato planter comprises a wind pressure control device, a sensor detection component, a wind pressure control module and an air extraction system; the air extraction system comprises a hydraulic pump, a hydraulic motor connected to the hydraulic pump through a hydraulic pipeline, and a fan connected to the output end of the hydraulic motor by transmission, the air inlet of the fan is connected to the air chamber of the planter seeding device through an exhaust pipe, a wind pressure sensor electrically connected to the processor is installed in the exhaust pipe, and an electro-hydraulic proportional speed regulating valve electrically connected to the processor is installed on the hydraulic pipeline. The present invention adopts hydraulic transmission to replace the traditional tractor rear power output shaft transmission, which is convenient for adjusting the fan speed and maintaining a stable fan working state; the wind pressure and wind speed sensor and the wind pressure control module are used to monitor and dynamically adjust the wind pressure and flow in the pipeline in real time, so that the wind pressure of the seeding device is always consistent.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery, and in particular to a wind pressure stabilization control system and a control method for an air suction type potato planter. Background Art

[0002] The existing potato seeders on the market mainly include potato clamp type, needle type, spoon chain type, air suction type, etc. The advantages of air suction precision seeders are that they are not strict with seeds, do not damage seeds, do not require selection and grading, have good seeding performance, and are suitable for high-speed sowing operations. The air supply system is the key part of the air suction seeder, and its performance will have a great impact on the sowing quality of the seeder.

[0003] However, there are still some problems in achieving pneumatic potato seeding: First, the working speed of the fan of the pneumatic system power source is unstable. The fan of the traditional pneumatic system, whether front-mounted or rear-mounted, is driven by the tractor engine. When the tractor is idling or turning, the working state of the fan will fluctuate with the engine. Second, there is the problem of uniformity and stability of air flow distribution in the pipeline of the pneumatic system. At present, the air pressure and flow in the pipeline of the pneumatic system of the air suction potato planter are mostly pre-set and cannot be adjusted. Secondly, the fluctuation of pressure and flow in the pipeline is also unknown. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a wind pressure stabilization control system and control method for an air-suction potato planter, which can monitor parameters such as wind pressure and wind speed in a pipeline in real time, so that the wind pressure of a seeding device always remains consistent, can achieve stable wind pressure control, a high degree of automation, and can significantly improve seeding accuracy.

[0005] The present invention is achieved through the following technical scheme, which provides a wind pressure stabilization control system for an air-suction potato planter, including a processor and an air extraction system; the air extraction system includes a hydraulic pump, a hydraulic motor connected to the hydraulic pump through a hydraulic pipeline, and a fan transmission-connected to the output end of the hydraulic motor, the air inlet of the fan is connected to the air chamber of the planter seed metering device through an exhaust pipe, a wind pressure sensor electrically connected to the processor is installed in the exhaust pipe, and an electro-hydraulic proportional speed control valve electrically connected to the processor is installed on the hydraulic pipeline.

[0006] This solution uses a hydraulic pump to drive the hydraulic motor to rotate, and then uses the hydraulic motor to drive the fan to rotate, avoiding fluctuations in the working state of the fan when the tractor is idling or turning; the air pressure in the pipeline is detected by a set wind pressure sensor, and the air pressure information is transmitted to the processor. After the processor compares the received air pressure information with the set value, it controls the opening of the electro-hydraulic proportional speed control valve, thereby achieving the purpose of adjusting the hydraulic motor, ensuring the stability of the wind pressure in the pipeline, and finally achieving the stability of the wind pressure of the seeder's seed metering device.

[0007] As an optimization, the exhaust duct includes a main air pipe connected to the air inlet of the fan, and at least two branch air pipes connected to the main air pipe, one end of the branch air pipe away from the main air pipe is connected to the air chamber of the seeding device of the planter, and a wind pressure control device is installed on the branch air pipe, and the wind pressure sensor is installed on the branch air pipe;

[0008] The air pressure control device includes a valve plate located in the branch air pipe, and a steering gear driving the valve plate to rotate, and the steering gear is electrically connected to the processor. This optimization scheme realizes air suction of multiple air chambers by setting at least two branch air pipes, each of which is connected to a different air chamber; if the air pressure in each branch air pipe is inconsistent, the processor controls each steering gear to rotate, driving the valve plate to rotate a certain angle, to adjust the ventilation area, and make the air pressure in each branch air pipe consistent.

[0009] As an optimization, a wind speed sensor electrically connected to the processor is also installed in the branch gas pipeline. This optimization solution detects the wind speed in the branch gas pipeline by setting a wind speed sensor, which facilitates the calculation of the air volume.

[0010] The present scheme also provides a method for stabilizing and controlling the wind pressure of an air-suction potato planter, comprising the following steps: after the power is turned on, the start button is pressed, the fan starts to work, the pressure in the pipeline is detected by a wind pressure sensor installed on the branch air pipe, and the pressure situation in the pipeline is fed back to the single-chip microcomputer in real time; the single-chip microcomputer receives the data and compares whether the set pressure is reached. If the set pressure is not reached, the PID algorithm is called to calculate the throttle opening that needs to be changed for the electro-hydraulic proportional speed control valve, and the signal is sent to the electro-hydraulic proportional speed control valve through a PWM pulse signal; if the set pressure is reached, the wind speed situation in the pipeline is fed back to the single-chip microcomputer in real time through the wind speed sensor installed on the branch air pipe, and the single-chip microcomputer calculates the real-time pressure in each branch air pipe. If the pressure in each branch air pipe is not equal, the PID algorithm is called respectively to calculate the angle that the servo in the air valve adjustment mechanism needs to rotate, and the servo is driven to rotate to the theoretical angle through the PWM pulse signal; if the pressure in each branch air pipe is equal, the servo angle is kept unchanged.

[0011] The beneficial effects of the present invention are as follows: hydraulic transmission is used instead of the traditional tractor rear power output shaft transmission, which facilitates the adjustment of the fan speed and maintains a stable fan working state; wind pressure, wind speed sensors and wind pressure control modules are used to monitor and dynamically adjust the wind pressure and flow in the pipeline in real time, and the wind volume, wind speed and other parameters in the pipeline can be monitored in real time, so that the wind pressure of the seed meter is always consistent, and the wind pressure can be stably controlled with a high degree of automation, which can significantly improve the seed metering accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an assembly diagram of the wind pressure stabilization control system of the air suction potato planter of the present invention;

[0013] Figure 2 It is a connection diagram of the hydraulic drive system of the present invention;

[0014] Figure 3 It is the hydraulic circuit diagram of the present invention;

[0015] Figure 4 It is a diagram of the sensor detection component of the present invention;

[0016] Figure 5 It is a diagram of the wind pressure regulating assembly of the present invention;

[0017] Figure 6 It is a flow chart of the system program of the present invention;

[0018] Figure 7 It is the design diagram of the system composition of the present invention;

[0019] As shown in the figure:

[0020] 1. Fan, 2. Wire tube fan connector, 3. Main air supply pipe, 4. Large three-way air flow distribution pipe, 5. Air pressure adjustment component fixing pipe, 6. Servo, 7. Wind speed sensor, 8. Small three-way air flow distribution pipe, 9. Terminal air supply hose, 10. Seeder seeding device air chamber, 11. Internal thread reducer interface, 12. Air pressure sensor, 13. Branch air supply pipe, 14. First frame, 15. Second frame, 16. Hydraulic oil pipe, 17. Electro-hydraulic proportional speed control valve, 18. Overflow valve, 19. Hydraulic motor, 20. Manual adjustment handle, 21. Air valve adjustment shaft, 22. Servo bracket, 23. Locking nut, 24. Valve plate, 25. Tractor, 26. First hydraulic quick-change connector, 27. Hydraulic gauge. DETAILED DESCRIPTION

[0021] The present invention provides a wind pressure stabilization control system and control method for an air suction potato planter to solve the problem that the air pressure required for potato pneumatic seeding is large and the wind pressure needs to be stably delivered. In order to clearly illustrate the technical features of the present solution, the present solution is described below through specific implementation methods.

[0022] like Figure 1 The wind pressure stabilization control system of an air suction potato planter shown in the figure includes a processor, a wind pressure control device, a sensor detection component, a wind pressure control module and an air extraction system. The processor is a single-chip microcomputer of the STM32F103ZET6 chip, which is used for collecting and processing data and feeding back to the adjustment execution device.

[0023] The air extraction system includes a hydraulic pump, a hydraulic motor 19 connected to the hydraulic pump through a hydraulic pipeline, and a fan 1 connected to the output end of the hydraulic motor. The air inlet of the fan is connected to the air chamber 10 of the seeding machine through an exhaust pipe. A wind pressure sensor 12 electrically connected to the processor is installed in the exhaust pipe, and an electro-hydraulic proportional speed control valve 17 electrically connected to the processor is installed on the hydraulic pipeline.

[0024] Specifically, the hydraulic transmission part includes a first hydraulic quick-change joint, a second hydraulic quick-change joint, a hydraulic oil pipe, an electro-hydraulic proportional speed regulating valve 17, a hydraulic gauge 27, a hydraulic motor 19 and a relief valve 18. For the convenience of description, it is now stipulated that the hydraulic quick-change joint connected to the tractor's built-in hydraulic pump is the first hydraulic quick-change joint, and the hydraulic quick-change joint connected to the tractor's built-in hydraulic oil tank is the second hydraulic quick-change joint. Figure 3 As shown, one end of the first hydraulic quick-change joint 26 is connected to the built-in hydraulic pump of the tractor, and the other end is connected to the hydraulic oil pipe 16 of the hydraulic transmission part; the hydraulic oil pipe is a component of the hydraulic circuit, and the hydraulic oil pipe is a hydraulic oil circulation pipeline and bears a certain oil pressure and connects various hydraulic components. The electro-hydraulic proportional speed regulating valve is located on the hydraulic oil pipe between the first hydraulic quick-change joint 26 and the hydraulic motor. According to the given input electrical signal, the electromagnet in the electro-hydraulic proportional speed regulating valve generates a series of actions to control the opening of the throttle, and then controls and adjusts the hydraulic motor 19 of the actuator in terms of operating speed and output torque. The hydraulic motor is located on the hydraulic oil pipe between the electro-hydraulic proportional speed regulating valve and the second hydraulic quick-change joint. A pulley connected to the power input shaft of the fan is installed on the output shaft of the hydraulic motor. The pulley is connected to the pulley on the power input shaft of the fan through a belt. The hydraulic motor is used to convert the energy of the hydraulic oil into mechanical energy. The hydraulic gauge 27 is installed between the electro-hydraulic proportional speed regulating valve and the hydraulic motor to monitor the pressure of the hydraulic oil circuit. The relief valve is located between the two hydraulic quick-change joints, which keeps the system pressure constant, thereby achieving the effects of pressure stabilization and pressure limiting.

[0025] The fan is fixed on the second frame 15, and is bolted through the screw holes at the bottom of the fan and the screw holes on the frame. A pulley is installed on the fan input shaft, which is connected to the pulley on the output shaft of the hydraulic motor through a belt. The air inlet of the fan is connected to the main air pipe through a wire tube fan joint. The fan is used to convert mechanical energy into gas energy to realize the air suction effect of the seed metering device.

[0026] The exhaust duct includes a main air pipe 3 connected to the air inlet of the fan, and at least two branch air pipes connected to the main air pipe. One end of the branch air pipe away from the main air pipe is connected to the air chamber of the seed metering device of the planter. A wind pressure control device is installed on the branch air pipe. The wind pressure sensor is installed on the branch air pipe. A wind speed sensor 7 electrically connected to the processor is also installed in the branch air pipe.

[0027] The main air pipe and branch air pipe of this embodiment are both hoses, and there are two branch air pipes, namely the left air pipe and the right air pipe, and the left air pipe, the right air pipe and the seed meter are all installed on the first frame 14. Specifically, the exhaust duct includes a wire tube fan joint 2, a main air pipe 3, a large three-way air flow distribution pipe 4, a branch air pipe 13, an internal thread reducer interface 11, a small three-way air flow distribution pipe 8 and a terminal air supply hose 9. For the convenience of description, this embodiment defines two concentric interfaces of the three interfaces of the three-way air flow distribution pipe as secondary interfaces, and defines the interface perpendicular to the two secondary interfaces as the main interface. One end of the wire tube fan connector is connected to the fan air inlet, and the other end is connected to the main air pipe, which is used to connect the fan air inlet and the main air pipe; one end of the main air pipe is connected to the wire tube fan connector, and the other end is connected to the main interface of the large three-way air flow distribution pipe; the main interface of the large three-way air flow distribution pipe is connected to the main air pipe, and the two interfaces are respectively connected to the two branch air pipes for air flow distribution; there are two branch air supply hoses with the same structure and function, and are symmetrically distributed about the bisecting plane of the two interfaces of the large three-way air flow distribution pipe, respectively providing air pressure for two seed dispensers; the branch air supply hose is L-shaped. For the convenience of description, the end of the L-shaped branch air supply hose close to the fan is defined as the L-shaped proximal end, and the end away from the fan is defined as the L-shaped distal end. The L-shaped proximal end is connected to the large three-way air flow distribution pipe, and at the proximal A wind pressure regulating component fixing tube 5 is installed on the end pipeline, and a circular hole is opened on the wind pressure regulating component fixing tube 5 at the proximal end for installing devices such as the air valve regulating shaft 21 and the steering gear 6; the L-shaped distal end is connected to an internal threaded reducer interface, and a wind pressure regulating component fixing tube is installed on the distal pipeline, and two circular holes are opened at a 90-degree angle on the wind pressure regulating fixed tube at the distal end for installing a wind pressure sensor 12 and a wind speed sensor 7; one end of the internal threaded reducer interface 11 is connected to the terminal air supply hose, and the other end is connected to the branch air supply pipe; one end of the terminal air supply hose is connected to the branch air supply hose through the internal threaded reducer interface, and the other end is connected to the main interface of the small three-way air flow distribution pipe; the two secondary interfaces of the small three-way air flow distribution pipe are respectively connected to the terminal air supply hose, respectively providing air pressure for the two air chambers of the seed metering device.

[0028] There are two sets of wind pressure control devices with the same structure and function, and their positions are symmetrically distributed about the bisecting plane of the two interfaces of the large three-way air flow distribution pipe. The wind pressure control device includes a circular valve plate 24 located in the branch air pipe, and a steering gear 6 that drives the valve plate to rotate. The steering gear is electrically connected to the processor, the diameter of the valve plate is adapted to the inner diameter of the branch air pipe, and the valve plate is fixed with a wind valve adjustment shaft 21 that extends radially out of the branch air pipe, and the wind valve adjustment shaft is drivingly connected to the output shaft of the steering gear.

[0029] As a specific implementation, the wind pressure control device of this embodiment includes a wind pressure regulating component fixed pipe 5, a wind valve, a steering gear bracket 22 and a steering gear. There are four wind pressure regulating component fixed pipes, two of which are arranged at the L-shaped proximal ends of the two L-shaped branch air pipes, concentric with the two interfaces of the three major ventilation flow distribution pipes, and a circular hole is opened on the wind pressure regulating component fixed pipe for fixing and installing the wind valve adjustment shaft. The other two are arranged at the L-shaped distal ends of the two L-shaped branch air pipes, and are opened with two circular holes distributed at an angle of 90 degrees for installing the wind pressure sensor and the wind speed sensor; the wind valve includes a circular valve plate, a wind valve adjustment shaft, a locking nut 23 and a manual adjustment handle 20. The circular valve plate is located in the fixed tube of the wind pressure component. The circular valve plate is fixedly provided with a wind valve adjusting shaft at a position along the diameter line of the circular valve plate. The circular valve plate is used to adjust the air volume. One end of the wind valve adjusting shaft is fixed on the circular valve plate. The other end extends out of the circular hole of the fixed tube of the wind pressure component and then continues to extend out of the circular hole of the steering gear bracket, and then cooperates with the circular hole at the bottom of the steering gear and is connected to the steering gear output shaft to replace the position of the steering plate. The extended end of the wind valve adjusting shaft and the extended part that cooperates with the fixed tube of the wind pressure component are both provided with threads. The locking nut 23 is used to lock the wind valve adjusting shaft on the fixed tube of the wind pressure component and is threaded with the wind valve adjusting shaft. Connection; the center of the manual adjustment handle 20 is equipped with a circular hole which cooperates with the air valve adjustment shaft and is used to manually adjust the angle of the circular valve plate; the servo bracket is a "X"-shaped bracket, and a circular hole is opened on the bracket for the air valve adjustment shaft to pass through, and two threaded holes are opened on both sides of the circular hole for installing the servo, and the bracket is fixed to the fixed pipe of the air pressure assembly through two wire tube clamps; the servo is installed on the servo bracket by bolt connection, and a circular hole is opened at the bottom of the servo to cooperate with the air valve adjustment shaft, so that the air pressure adjustment shaft is connected to the output shaft of the servo, and the servo is used to receive a PWM pulse signal and then rotate the air valve adjustment shaft to the required angle.

[0030] The sensor detection component part includes a wind pressure sensor and a wind speed sensor. There are two sets of sensor detection components with the same structure and function, which are arranged on two branch gas pipes respectively; the wind pressure sensor is installed on the wind pressure component fixed pipe in the branch gas pipe, specifically at the far end of the L-shaped branch gas hose, and there are two circular holes on the wind pressure component fixed pipe distributed at a 90-degree angle for installing the wind pressure sensor and wind speed sensor; the wind pressure sensor is installed on the circular hole far away from the ground, and is used to measure the wind pressure in the branch gas pipe after the steering gear adjusts it; the wind speed sensor is installed on the wind pressure component fixed pipe in the branch gas pipe, specifically at the far end of the L-shaped branch gas pipe, and the wind speed sensor is installed on the circular hole close to the ground, with the circular axis parallel to the ground, and is used to measure the wind speed in the branch gas pipe.

[0031] The wind pressure control module includes an information collection device, a signal device, a processor, and an execution device. The information collection device includes a wind pressure sensor and a wind speed sensor, which are installed in the gas pipeline behind the steering gear. The pressure and wind speed data detected by the sensor are transmitted to the processor; the signal device includes ADC and PWM.

[0032] ADC is an analog-to-digital converter, which is used to convert the analog signal collected by the sensor into a digital signal;

[0033] PWM is a technology that uses the digital output of a microprocessor to control analog circuits. The processor outputs a PWM pulse signal to control the actuator; the actuator includes an electro-hydraulic proportional speed control valve and a servo.

[0034] Air pressure control module algorithm design: The core control algorithm used by the system is the standard incremental PID algorithm.

[0035]

[0036] After discretization, it can be converted into:

[0037]

[0038] Incremental algorithm:

[0039]

[0040] in

[0041] where e k is the difference between the target value and the measured value at the current moment, e k-1 is the difference between the target value and the measured value at the previous moment, e k-2 Same reason.

[0042] Where Δu k This is the output value of the standard incremental PID.

[0043] Compared with the position PID algorithm, the error caused by the integral in the standard incremental PID algorithm is smaller and is suitable for objects that require integration. The standard incremental PID algorithm is stable, controllable and efficient, and is widely used in closed-loop systems such as aircraft. Therefore, this system uses the incremental PID algorithm, where the P, I, and D values ​​are the previously entered fixed values ​​of 5, 4, and 2.

[0044] The control method performed by the air pressure stabilization control system of the air suction potato planter of the present embodiment comprises the following steps: after the power is turned on, the start button is pressed, the fan starts to work, the pressure in the pipeline is detected by the wind pressure sensor installed on the branch air pipe, and the pressure situation in the pipeline is fed back to the single chip microcomputer in real time; the single chip microcomputer receives the data and compares whether the set pressure is reached. If the set pressure is not reached, the PID algorithm is called to calculate the throttle opening that needs to be changed by the electro-hydraulic proportional speed control valve, and the signal is sent to the electro-hydraulic proportional speed control valve through a PWM pulse signal; if the set pressure is reached, the wind speed situation of the pipeline is fed back to the single chip microcomputer in real time through the wind speed sensor installed on the branch air pipe, and the single chip microcomputer calculates the real-time pressure in each branch air pipe. If the pressure in each branch air pipe is not equal, the PID algorithm is called respectively to calculate the angle that the steering gear in the air valve adjustment mechanism needs to rotate, and the steering gear is driven to rotate to the theoretical angle through the PWM pulse signal; if the pressure in each branch air pipe is equal, the steering gear angle is kept unchanged.

[0045] In order to make the use of this solution clearer, the specific use methods of each part of the control system of the present invention are described below:

[0046] 1. Air extraction system: When starting to work, first connect the first hydraulic quick-change joint to the output port of the built-in hydraulic oil pump of the tractor 25, and connect the second hydraulic quick-change joint to the built-in hydraulic oil tank of the tractor; the hydraulic oil pump in the tractor 25 starts to run, and the hydraulic oil is sucked out from the hydraulic oil tank in the tractor 25, passes through the first hydraulic quick-change joint 26, and then flows through the electro-hydraulic proportional speed regulating valve 17 to control the flow and pressure of the system, and the excess oil pressure is unloaded through the set overflow valve 18, and the hydraulic gauge 27 monitors the pressure. After the hydraulic oil reaches the hydraulic motor 19, the hydraulic motor 19 performs continuous rotation to drive the pulley The belt drives the belt to rotate and then drives the pulley connected to the power input shaft of the fan to rotate, thereby driving the fan 1 to operate. At this time, the hydraulic oil flows back to the second hydraulic quick-change joint and flows back to the oil tank for heat dissipation. At this time, the fan 1 starts to work, and the airflow enters from the two negative pressure air chambers of the seed metering device 10, passes through the terminal air supply hose 9, enters the small three-way air flow distribution pipe 8, and then flows through the internal threaded reducer interface 11, and enters the branch air pipe 13. In the branch air pipe 13, the negative pressure airflow passes through the wind speed sensor 7 and the wind pressure sensor 12 in the wind pressure regulating component pipe, and the air volume regulating valve, and finally enters the fan through the main air pipe 3 for discharge.

[0047] 2. Air pressure control device: When working, the servo 6 receives the PWM signal sent by the single chip microcomputer, and drives the servo 6 to rotate to the theoretical angle through the PWM pulse signal. The output shaft of the servo 6 is connected to the air valve adjustment shaft 21, and the air valve adjustment shaft 21 also rotates. At the same time, the air valve adjustment shaft 21 is fixedly connected to the circular valve plate 24, thereby driving the circular valve plate 24 to rotate a certain angle, so that the air volume in the air duct reaches the specified range. When the air volume on the left and right sides is the same, the servo keeps the angle unchanged.

[0048] 3. Sensor detection component: When the air supply system starts working, the wind pressure sensor 12 and the wind speed sensor 7 collect the precise wind pressure and wind speed in the gas pipeline and feed back to the single chip microcomputer in real time;

[0049] 4. Wind pressure control module: After the power is turned on, press the start button, and the fan 1 starts working. The pressure situation in the pipeline is fed back to the single-chip microcomputer in real time through the wind pressure sensor 12 installed on the left and right air ducts. The single-chip microcomputer receives the data and compares whether the set pressure is reached. If the set pressure is not reached, the PID algorithm is called to calculate the throttle opening that needs to be changed by the electro-hydraulic proportional speed control valve 17, and the signal is sent to the electro-hydraulic proportional speed control valve 17 through a PWM pulse signal; if the set pressure is reached, the wind speed situation of the pipeline is fed back to the single-chip microcomputer in real time through the wind speed sensors installed on the left and right air ducts. The single-chip microcomputer calculates the real-time pressure of the left and right air ducts. If the pressures of the left and right air ducts are not equal, the PID algorithm is called respectively to calculate the angle that the servo in the air valve adjustment mechanism needs to rotate, and the servo is driven to rotate to the theoretical angle through the PWM pulse signal; if the pressures of the left and right air ducts are equal, the servo angle is kept unchanged.

[0050] This embodiment takes the operation of an air-suction potato planter as an example. The number of branch air supply pipelines provided in the present invention is not limited and is not limited to potato planting operations. The device can be increased or decreased according to actual needs and applied to different air supply systems.

[0051] The present invention realizes a negative pressure air supply system through components such as a hydraulic motor, a fan, and an air supply pipeline; the pressure condition in the pipeline is fed back to an air pressure control module in real time through an air pressure sensor and a wind speed sensor, thereby realizing real-time monitoring of the air pressure and air volume in the air supply pipeline; the air pressure control device is adjusted through the air pressure control module, thereby realizing adjustment of the working air pressure of the air supply system, achieving the optimal working negative pressure of the air suction type seed metering device, and realizing efficient sowing.

[0052] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A wind pressure stabilization control system for an air suction potato planter, characterized in that: It comprises a processor and an air extraction system; the air extraction system comprises a hydraulic pump, a hydraulic motor (19) connected to the hydraulic pump via a hydraulic pipeline, and a fan (1) drivingly connected to the output end of the hydraulic motor, the air inlet of the fan is connected to the air chamber (10) of the seeding device of the planter via an exhaust pipeline, a wind pressure sensor (12) electrically connected to the processor is installed in the exhaust pipeline, and an electro-hydraulic proportional speed regulating valve (17) electrically connected to the processor is installed on the hydraulic pipeline; The exhaust duct comprises a main air pipe (3) connected to the air inlet of the fan, and at least two branch air pipes connected to the main air pipe, one end of the branch air pipe away from the main air pipe is connected to the air chamber of the seeding device of the planter, and a wind pressure control device is installed on the branch air pipe, and the wind pressure sensor is installed on the branch air pipe; The wind pressure regulating device comprises a valve plate (24) located in the branch air pipe, and a steering gear (6) for driving the valve plate to rotate, wherein the steering gear is electrically connected to the processor; A wind speed sensor (7) electrically connected to the processor is also installed in the branch gas transmission pipe; The control method of the air pressure stabilization control system of the air suction potato planter comprises the following steps: after the power is turned on, the start button is pressed, the fan starts to work, the pressure in the pipeline is detected by the wind pressure sensor installed on the branch air pipeline, and the pressure situation in the pipeline is fed back to the single chip microcomputer in real time; the single chip microcomputer receives the data and compares whether the set pressure is reached, if the set pressure is not reached, the PID algorithm is called, the throttle opening that needs to be changed by the electro-hydraulic proportional speed control valve is calculated, and the PWM pulse signal is sent to the electro-hydraulic proportional speed control valve; if the set pressure is reached, the wind speed sensor installed on the branch air pipeline is used to feed back the wind speed situation of the pipeline to the single chip microcomputer in real time, and the single chip microcomputer calculates the real-time pressure in each branch air pipeline, if the pressure in each branch air pipeline is not equal, the PID algorithm is called respectively, the angle that the steering gear in the air valve adjustment mechanism needs to rotate is calculated, and the steering gear is driven to rotate to the theoretical angle through the PWM pulse signal; if the pressure of each branch air pipeline is equal, the steering gear angle is kept unchanged.

Images