Third, the precise variable sprayer spraying pesticides will also cause waste and environmental pollution. The three major problems that need to be solved in the manufacture of precise variable sprayers are: the control of spray flow rate and the size of the spray droplets; the amount of sprayed spray is affected by the speed of travel; the volume of the drug in the plot and the size of droplets cannot be required by the prescription map. Positioning adjustment. Figure 16 shows the precision variable sprayer. Air-Dried Ginger,Air-Dried Fresh Ginger,Dried Ginger,Dried Fresh Ginger JINING FORICH FRUITS & VEGETABLES CO., LTD. , http://www.forichgarlic.com
Abroad have been developing light reflection sensors, using brown soil and green crop leaves can reflect different wavelengths of light waves, can be used to identify the soil, crops and weeds. Using the difference in reflected light waves can be used to identify crop leaves that are deficient in nutrition or infected with pests. There are two methods to apply herbicides to the variable. One is to use weed detection sensors to collect information on field weeds at any time, and to control the amount of herbicide sprayed through variable spray equipment control systems; the other is to use weeds in advance. The sensor plots the distribution map of weeds in the field, and then comprehensively processes the plan to draw an electronic map of the weed patches. The electronic map outputs the prescriptions, which are implemented by the variable spraying machine. Studies have shown that the herbicide dosage can be reduced by 40% to 60% through the use of prescription variables. The “Weeds Seeker PhD 600†produced by PATCHEN is a pesticide variable supply system using a semiconductor diode light reflection sensor. It uses a light emitting diode as a light source. The photodiode receives and analyzes the reflected light wave data, generates a signal and controls a spray nozzle valve. Herbicides are sprayed only when weeds appear to reduce herbicide use.
The control system of the sprayer is based on an improved Pulse Width Modulation (PWM), as shown in FIG. The further improvement of the system is to independently adjust the dose and droplet size according to the requirements of the field plots (prescription) drawn in advance and the GPS positioning of the sprayer in the field. A DGPS receiver provides ground speed and distance data into onboard computers. The computer determines the flow rate and pressure of sprays from one position to another in the field according to the user's pre-set spray volume and droplet size field distribution map. The pressure control circuit is an improved electro-hydraulic control valve and centrifugal spray pump. The pressure setpoint is from the on-board computer setpoint via the closed-loop controller. The commodity flow controller maintains closed-loop control of the flow. The setting of the flow rate is automatically adjusted by the input travel speed value. The system is installed on commercially-available spray trailers. The flow rate can be adjusted to 4:1, and the pressure change is 70 to 700 kPa. The response rate is 12 Hz.