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CN-121970736-A - Variable spraying device and use method

CN121970736ACN 121970736 ACN121970736 ACN 121970736ACN-121970736-A

Abstract

The invention belongs to the technical field of intelligent agricultural equipment, and particularly relates to a variable spraying device and a using method thereof, wherein the variable spraying device comprises a frame, a spraying device and a controller, wherein the controller is provided with a working condition acquisition, PWM control and PFM control module, and closed-loop regulation and control are realized through a high-frequency electromagnetic valve and a pressure and flow sensor; the device is used for controlling spraying according to a preset functional relation by combining frequency and duty ratio parameters, and can recycle liquid medicine for circulation test by a test water tank and a reflux device with a specific diversion structure when the functional relation is calibrated. The invention aims to improve the precision and stability of variable spraying by combining the joint regulation and control of PWM and PFM and the feedback of a real-time sensor.

Inventors

  • XIE CHUNJI
  • WU ZHOUPENG
  • YANG WENSHENG
  • HE YAO
  • CHEN SHUO
  • LI HUA
  • DING ZIHAN
  • GAO MINMIN
  • LI YIMENG
  • Wei Yinying
  • CHEN XINYI
  • LIU WENXUAN
  • WU MIAOMIAO
  • SHEN HONGYI

Assignees

  • 南京农业大学

Dates

Publication Date
20260505
Application Date
20260305

Claims (10)

  1. 1. A variable spray device, comprising: The spraying device comprises a frame (1), a spraying device (2) connected to the frame (1) and a controller (4) in control connection with the spraying device (2); the controller (4) comprises a working condition acquisition module, a PWM control module and a PFM control module; The working condition acquisition module is used for acquiring the flow and pressure of the liquid medicine input; the PFM control module is used for adjusting the control signal transmitting frequency of the PWM control module; Wherein the spraying device (2) comprises a spray rod (202) connected to the frame (1) and a plurality of fan-shaped spray heads (204) communicated with the spray rod (202), and the fan-shaped spray heads (204) are communicated with the spray rod (202) through high-frequency electromagnetic valves (203); The spray lance (202) is communicated with the liquid supply end, the spray lance (202) is communicated with the pressure detection part and the flow detection part, the pressure detection part and the flow detection part are connected with the working condition acquisition module, and the high-frequency electromagnetic valve (203) is connected with the PWM control module.
  2. 2. A variable spraying device according to claim 1, characterized in that the frame (1) comprises a platform (101) and a plurality of spray bar holders (102) fixed on the platform (101), wherein both ends of the spray bar (202) are fixed with the platform (101) by the spray bar holders (102), respectively.
  3. 3. A variable spraying device according to claim 1, characterized in that the pressure detecting part comprises a pressure sensor (201), the pressure sensor (201) being arranged in communication at one end of the spray boom (202).
  4. 4. A variable spraying device according to claim 1, wherein the flow detecting portion comprises a flow sensor (205), one end of the flow sensor (205) communicates with the other end of the boom (202), and the other end of the flow sensor (205) communicates with the liquid supply end.
  5. 5. A variable spraying device according to claim 4, characterized in that the liquid supply end comprises a water pump (206), the liquid outlet end of the water pump (206) is communicated with the liquid inlet end of the flow sensor (205), and the liquid inlet end of the water pump (206) is communicated with the liquid storage tank through a water pipe (207); Wherein, the liquid storage tank is used for storing liquid medicine.
  6. 6. A method of using a variable spray device according to any one of claims 1to 5, comprising the steps of: determining spraying time and preset spraying quantity; setting a control signal transmitting frequency value; acquiring the duty ratio value according to the preset spraying quantity, the function relation between the control signal emission frequency value and the duty ratio value; The PWM control module adjusts the duty ratio of the fan-shaped spray head (204) by controlling the on-off of the high-frequency electromagnetic valve (203) according to the duty ratio value; And the PFM control module adjusts the control signal emission frequency of the PWM control module according to the control signal emission frequency value.
  7. 7. The method of using a variable spray device of claim 6, wherein the functional relationship is a linear functional relationship.
  8. 8. The method of using a variable spraying device according to claim 6, wherein the means for obtaining the functional relationship comprises: A test water tank (103) and a reflux device (3) which are fixed on the frame (1), wherein the test water tank (103) is used as the liquid supply end; the liquid inlet end of the reflux device (3) is communicated with the liquid outlet ends of the fan-shaped spray heads (204), and the liquid outlet end of the reflux device (3) is communicated with the test water tank (103).
  9. 9. The method of using a variable spray device according to claim 8, wherein the backflow device (3) comprises a left side support plate (301), a rear side support plate (302), a right side support plate (303) and a front side diversion structure which are fixedly arranged; The left side support plate (301), the rear side support plate (302), the right side support plate (303) and the front side flow guiding structure are surrounded to form a box structure; The bottoms of the left side support plate (301), the rear side support plate (302) and the right side support plate (303) are simultaneously fixed with a bottom side inclined plate (307), and the bottom side inclined plate (307) is used as a liquid outlet end of the reflux device (3) and is communicated with a liquid inlet end of the test water tank (103); The device comprises a bottom inclined plate (307), a right side guide plate (306) and a left side guide plate (308) are fixed on the bottom inclined plate (307), the right side guide plate (306) and the left side guide plate (308) are symmetrically arranged, and an intersection point of a straight line where the right side guide plate (306) is located and a straight line where the left side guide plate (308) is located at one side of a liquid inlet end of the test water tank (103).
  10. 10. The method of using a variable spray device according to claim 9, wherein the front side guide structure comprises a front side support plate (304) at the top and a front side sloping plate (305) at the bottom, the front side support plate (304) is fixed to the front side sloping plate (305), and the front side sloping plate (305) is fixed between the left side support plate (301) and the right side support plate (303).

Description

Variable spraying device and use method Technical Field The invention belongs to the technical field of intelligent agricultural equipment, and particularly relates to a variable spraying device and a using method thereof. Background In accurate agricultural practice, the variable spraying technology is one of core technologies for realizing medicine reduction and synergy and protecting the environment. The technique relies on an actuator that is capable of adjusting the spray volume in real time. Currently, variable spraying devices commonly used in the market mostly employ Pulse Width Modulation (PWM) control technology based on solenoid valves. The device coarsely adjusts the average spray flow by adjusting the control signal duty ratio of the driving electromagnetic valve, namely changing the opening time proportion of the electromagnetic valve in one period, and becomes a main stream technical scheme for realizing variable spray. However, the existing variable spraying device and the control method thereof have obvious limitations, and restrict the accuracy and the adaptability of the variable spraying device. First, in the control principle, most existing devices only use a single PWM control, i.e. only adjust the duty cycle parameter, and neglect the substantial influence of the control signal frequency (i.e. PFM regulation) on the response characteristics of the solenoid valve, the fluid dynamics of the fluid path system and the final atomization effect. The control of the single dimension leads to inaccurate spray quantity regulation model, and especially when the spray quantity regulation model is used for coping with different liquid medicine characteristics or working condition changes, the regulation linearity is poor and the precision is insufficient. Secondly, in terms of system constitution, most of the existing devices are in open loop control, high-precision flow and pressure sensors are not integrated, or a sensing feedback and control algorithm cannot be effectively closed loop, so that the system cannot compensate spray quantity deviation caused by pressure fluctuation, component abrasion and other factors in real time, and operation stability and reliability are difficult to guarantee. In summary, the conventional variable spraying device generally has the problems of low regulation precision caused by single control dimension (only PWM duty ratio), poor stability caused by lack of closed-loop feedback, and the like. Accordingly, there is a need for a variable spray device and method of use that addresses the above-described issues. Disclosure of Invention The invention aims to provide a variable spraying device and a using method thereof, so as to solve the problems. In order to achieve the above object, the present invention provides the following solutions: A variable spray device comprising: the spraying device comprises a frame, a spraying device connected to the frame and a controller in control connection with the spraying device; the controller comprises a working condition acquisition module, a PWM control module and a PFM control module; The working condition acquisition module is used for acquiring the flow and pressure of the liquid medicine input; the PFM control module is used for adjusting the control signal transmitting frequency of the PWM control module; The spraying device comprises a spray rod connected to the frame and a plurality of fan-shaped spray heads communicated with the spray rod, and the fan-shaped spray heads are communicated with the spray rod through high-frequency electromagnetic valves; The spray boom is communicated with the liquid supply end, the spray boom is communicated with the pressure detection part and the flow detection part, the pressure detection part and the flow detection part are connected with the working condition acquisition module, and the high-frequency electromagnetic valve is connected with the PWM control module. Optionally, the frame includes the platform and fixes a plurality of spray lance supports on the platform, wherein, the both ends of spray lance pass through respectively the spray lance support with the platform is fixed. Optionally, the pressure detecting part includes a pressure sensor, and the pressure sensor is communicated with one end of the spray rod. Optionally, the flow detection portion includes a flow sensor, one end of the flow sensor is communicated with the other end of the spray boom, and the other end of the flow sensor is communicated with the liquid supply end. Optionally, the liquid supply end comprises a water pump, the liquid outlet end of the water pump is communicated with the liquid inlet end of the flow sensor, and the liquid inlet end of the water pump is communicated with the liquid storage tank through a water pipe; Wherein, the liquid storage tank is used for storing liquid medicine. The application method of the variable spraying device comprises the following steps of: determining sprayin