تصميم ونمذجة مرش آلي عمودي لرش أشجار البساتين

Abstract

Traditional orchard sprayers are difficult to control the spraying process in a way that suits the shapes of the different orchard tree crowns, in addition to the losses and high consumption of pesticides due to the interference between the spray cones. In order to improve the operational and design performance of orchard sprayers, a vertical automatic sprayer was designed and modeled. It consists of a steel base carrying a tank and support with a height of (2m) fixed to it. A chain is fixed on it on which a lever moves up and down, taking its movement from a motor and a spray arm with a length of (1m) is fixed on the lever, carrying a cone nozzle linked to a motor that can be used to control the distance of the nozzle from the surface of the tree crown. It also moves right and left within a channel that takes its movement from a motor to ensure complete coverage of the tree, which improves the efficiency of the spraying process and provides greater flexibility in the spraying process. The modeling results showed that the flow rate of the nozzle increases with increasing the spray angle to record a value of (0.16L/sec) at a spray angle of (14◦) and a value of (0.34L/sec) at an angle of (28◦). It also increases with increasing the spray pressure to record the value (0.16L/sec) at a pressure of (1 bar) and the value (0.34L/sec) at a pressure of (5 bar), and is directly proportional to the depth of the tree crown to record the value (0.14L/sec) at a depth of (0.2 m) and the value (0.34L/sec) at a depth of (2 m) These results emphasize the need to balance the environmental impact and biological effectiveness of orchard sprays.