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Design and test of the airflow adjustment test bench for orchard air-assisted spraying

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2021 ASABE Annual International Virtual Meeting  2100698.(doi:10.13031/aim.202100698)
Authors:   Hanjie Dou , Changyuan Zhai , Wei Zou , Xiu Wang, Liping Chen
Keywords:   orchard precision spraying; airflow adjustment; fan speed; air inlet area; deflector angle

Abstract. Pesticide application rate and airflow supply rate are the two manipulated outputs of an orchard sprayer control system. The distribution of pesticide deposits inside and outside the canopy of fruit trees depends largely on the airflow supply rate supply. The pesticide application rate and airflow supply rate should be simultaneously controlled precisely to realize the orchard precision spraying. Based on the axial flow fan, this paper designs an orchard airflow adjustment test bench that can independently control the fan speed, the air inlet area and the angle of deflector in the bellows. The fan speed is adjusted by DC motor. The air inlet adopts a louver structure to change the air inlet area by adjusting the inclination angle of the louvers. The air outlet adopts a tower structure, the deflectors at different nozzle positions of the air outlet are controlled by 22 steering gears to independently adjust the angle of the deflector. The independent adjustment tests of fan speed, air inlet area and angle of deflectors in the air outlet was carried out based on the test bench. The results showed that the air speed and air volume at different positions of the fruit tree canopy can be regulated by adjusting the fan speed and the inclination angle of the deflector or the air inlet area and the inclination angle of the deflector. This research provides a new method for the airflow online on-demand adjustment based on changes in the volume and density of the fruit tree canopy.

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