基于PWM的远程控制新型变量喷雾系统设计

发布时间：2018-08-04 09:16

【摘要】：针对目前地面植保喷雾机械的局限性,开发了一种新型的变量喷雾系统。该系统在保持电动离心喷头压力和流量不变的前提下,采用离心雾化方式,雾化盘由三相无感无刷直流电机带动,利用ARM控制器输出频率固定占空比不同PWM信号作为无刷直流电机电子调速器的油门转速信号,改变雾化盘的转速,从而改变雾滴的粒径大小及覆盖率等参数。该系统采用了一个功率较大的无线收发模块SI4432,最大距离达到2km范围(这也是和其他远程喷雾系统相比根本的优势),用单片机和上位机远程实时地控制雾化盘的转速,同时在上位机和液晶屏幕上显示占空比。最后,利用设计的变量喷雾平台,在喷头压力为0.5MPa、流量为2L/min、雾化盘直径为5 8 mm的条件下,获得了离心雾化喷头在不同的占空比对应的雾滴中值直径和覆盖率大小,通过上位机就可以实现电动离心喷头转速的较大范围的调整,可以在不同喷雾环境下针对不同的农作物使用这套系统。
[Abstract]:A new variable spray system was developed to overcome the limitations of the current plant protection spraying machinery. On the premise of keeping the pressure and flow of electric centrifugal nozzle unchanged, the system adopts centrifugal atomization mode, and the atomizing disk is driven by three-phase brushless DC motor. The ARM controller is used to output different PWM signals with fixed duty cycle ratio as the throttle speed signal of the brushless DC motor electronic governor to change the speed of the atomizing disk and thus change the particle size and coverage of the droplets. The system adopts a high-power wireless transceiver module SI4432.The maximum distance reaches the 2km range (which is also the fundamental advantage compared with other remote spray systems), and the speed of atomization disk is controlled in real time by single chip microcomputer and host computer. At the same time in the host computer and LCD screen display duty cycle. Finally, under the conditions of nozzle pressure of 0.5 MPA, flow rate of 2 L / min and diameter of atomizing disk of 58 mm, the median diameter and coverage of droplet in different duty cycle of centrifugal atomizing nozzle are obtained by using the designed variable spray platform. The speed of electric centrifugal nozzle can be adjusted in a wide range by the upper computer, and the system can be used for different crops in different spray environments.
【作者单位】：哈尔滨工业大学(深圳);深圳市先进制造技术重点实验室;
【基金】：深圳市创新环境建设计划重点实验室提升项目(ZDSYS20140508161547829) 深圳市科技计划基础研究项目(JCYJ20150625142543480);深圳市科技计划基础研究项目(JCYJ20150625142543480,JCYJ20150625142543449)
【分类号】：TP872;S491

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