Design and test of online mixing pesticide system of sprayer based on conductivity characteristics of pesticide
In view of the widespread use of manual pre-mixing method in traditional spraying machinery,which is harmful to operators,has large mixing ratio errors and wastes pesticides,an online mixing pesticide system based on the conductivity characteristics of the pesticide is designed to realize accurate control of real-time mixing and application and mixing ratio.In this paper,glyphosate pesticide was selected as the test object,and the calibration test was conducted to obtain the relationship between the mixing ratio of glyphosate and the conductivity value.A programmable logic controller(LK3U-14)was chosen as the control unit,and an electrical monitoring system and electrical control system of liquid drug concentration were designed.The test results show that the mixing ratio of glyphosate solution and conductivity are linearly proportional to each other,with a coefficient of determination of 0.998 5.The relative error of the system's mixing ratio is within the±5%range,and the time variation coefficient of the mixing ratio is less than 5%,which meets the requirements of spraying operation.
sprayeronline mixing pesticideconductivitymixing ratio
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