气力板式蔬菜排种器吸排种动力学模型研究

摘要

为合理设计气力板式蔬菜排种器参数,建立种子在吸排种阶段的动力学模型,研究了影响吸排种效果的主要因素.结果表明,增加吸种孔口气流量、减小排种器的转速、提高种子与排种器的滑动摩擦系数、降低排种器连接臂长,有助于提高种子的被吸附效果.为使种子能被稳定吸附在吸种孔上,并随排种器转动到排种位置,应适当增加真空度和吸种孔直径,增加种子与排种器表面间的静摩擦系数,减小排种器转速,降低排种器连接臂长,并适当控制排种的种子量.排种阶段应尽量减小排种高度,控制正压流场强度不宜太大,以免种子反弹影响排种效果.%For designing high performance pneumatic plate-type vegetable metering device ,dynamic models of seeds during metering process were established. Combined with experiments study, main factors of seeding effects were discussed. The absorption effect can be enhenced by increasing inlet air flow volume of the suction hole, reducing rotation speed of the metering device, increasing sliding friction coefficient between seeds and the seed metering device, and decreasing ann length of the seed metering device. For insuring the seeds can be absorbed stably to their metering position, vacuum degree and diameter of the suction hole should be increased properly for avoiding difficulty of ejection. Increasing static friction characteristics between seeds and seed metering device, reducing rotation speed of the metering device, decreasing arm length of the seed metering device, and properly controlling seed quantity are helpful for stable suction of seeds. When ejecting seeds, the ejection height should be as small as possible, and intensity of the jet flow field should not be too large for preventing rebounding of seeds.