Authors

Abstract

The vertical disc seed metering device was selected to study the influence of the structural characteristics of seed group on the filling performance of seed metering device. The working process of seed metering device was simulated by discrete element software to study the influence of seed quantity and structure characteristics of seed chamber on seed movement and filling results. The seed group was divided into four zones: ascending zone, relative static zone, collapse zone and recirculation zone. The number of seeds and the rotation speed of have no effect on the inclination angle of the upper surface of recirculation zone, which was always about 35°. But they had a significant effect on the filling performance. When the number of seeds was 500-1500, QFI decreased, MIS increased and MUL did not change significantly. However, when the number of seeds was 2000, the change trend of filling performance was completely opposite. Inner surface inclination angle and axial width of the seed chamber have significant effects on the filling performance. QFI first increased and then decreased with the increase of inclination angle, reaching the maximum at 20 ° and MIS showed the opposite trend. QFI increases with the increase of thickness and tends to be stable at 40mm. Similarly, MIS has the opposite trend.

Abstract in Chinese

为了了解种子群的结构特性对排种器充种性能的影响规律，选取垂直圆盘侧充排种器为研究对象，利用离散元软件EDEM对排种器的工作过程进行仿真试验，研究种群数量及种室的结构特征对种群运动和充种效果的影响规律。离散元仿真显示种群分为上升区、相对静止区、塌落区、回流区。回流区上表面的倾角与种子数量及排种盘的转速无关，始终保持在35°左右。种群数量和排种盘转速对充种结果具有显著影响，种子数为500-1500时，QFI随转速增加而降低，而MIS逐渐增大，同时MUL变化不显著;当种子数为2000时，充种性能的变化与500-1500时刚好相反。种室的底面倾角和厚度对充种性能具有显著影响，QFI随倾角的增大先增大后降低，在20°时达到最大，MIS变化与QFI相反；合格率随厚度增加而逐渐增大并在40mm时趋向稳定，同样MIS的变化趋势与QFI完全相反。