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 type of variable spray system is developed in view of the limitations of the current ground protection spray machine. The system uses a centrifugal atomizing mode to keep the pressure and flow of the electric centrifugal nozzle unchanged. The atomizing disk is driven by a three-phase brushless DC motor, and the output frequency of the ARM controller is fixed with different PWM signals. For the speed signal of the throttle speed of the brushless DC motor speed governor, the speed of the atomized disk is changed and the size of the droplet size and the coverage rate are changed. The system adopts a wireless transceiver module SI4432 with a large power, and the maximum distance reaches the range of 2km (this is also the fundamental advantage compared to his remote spray system), using a single chip. At the same time, the speed of the atomizing disk is controlled and the duty ratio is displayed on the upper computer and the LCD screen. Finally, with the designed variable spray platform, under the condition of the nozzle pressure of 0.5MPa, the flow rate of 2L/min and the diameter of the atomizing disk 58 mm, the centrifugal atomizing nozzle is obtained in the middle of the droplets corresponding to the different duty ratio. The size of the diameter and the coverage rate can adjust the speed of the electric centrifugal sprinkler in a larger range by the upper computer. It 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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