基于电磁阀的喷嘴直接注入式农药喷洒系统

设计了一种喷嘴直接注入式农药喷洒系统。通过与传统喷雾机械比较,简述了喷嘴直接注入式喷雾系统的结构和喷雾执行单元。为了实现农药定量注入,设计一种基于电磁原理的快速响应阀,并论述其工作原理和闭环控制方式。通过试验测试了喷雾执行单元的喷雾特性和喷杆组内各喷雾单元的一致性。结果表明在一定喷洒速率范围内,喷雾执行单元的喷水量和水压强存在多项式关系,农药注入量和PWM信号的高电平时间存在指数关系,其决定系数均高于0.9,并且同一喷杆组内6个喷雾单元的喷雾效果大体一致。

Direct Nozzle Injection Sprayer Based on Electromagnetic-force Valve

A type of direct nozzle injection sprayer was developed. By comparing with traditional spraying machines, the detailed structure and advantage of direct nozzle injection sprayer, especially to the injection unit, were analyzed. In order to dose pesticide precisely, a type of fast reaction valve based on electromagnetic principle was designed. The structure and control strategy were discussed in detail. The test of sprayer performance was carried out. The results showed that there existed a polynomial relationship between the water injection and the water pressure, and an exponential relationship between the pesticide injection and the opening time of PWM signal. The determination coefficients of both models were above 0.9. Besides, the uniformity of the six injection units within one boom section was tested and showed good performance.