Design and test of key components of crawler-type air-fed powder spraying machine
Aiming at the problems of low operational efficiency,poor application effect and low utilization rate of pesticides in traditional natural rubber plant protection,this study developed a high-lift crawler-type air-fed powder sprayer that can realize variable application.Through theoretical analysis of the working mechanism of each key component in the process of spraying chemical powder,the design and selection of key components of the complete powder spraying machine were carried out.According to the powdery mildew control standard and individual information of rubber trees,a variable application control system was designed.The experiment in rubber plantation showed that under different application rates and obvious differences in individual information of rubber trees,the effective utilization rate of powder in the canopy of target rubber trees was 46.93％,42.2％and 39.72％,respectively,and the coefficients of variation of deposition per unit area in the canopy of target rubber trees were 18.77％,24.89％and 12.51％,respectively,which indicated that the differences of deposition per unit area of rubber tree leaves in the upper,middle and lower layers of rubber trees were the difference in the amount of deposition per unit area of rubber tree leaves was not obvious,and the powder deposition per unit area was more uniform,and the effect of drug application was better.The results of this study provide technical support for the mechanized plant protection of natural rubber trees.
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