型孔轮式机械排种器不能适应精播的主要原因之一是对种子尺寸变化适应性差。本文以一种内侧充种垂直圆盘排种器———组合内窝孔精密排种器为例 ,对该排种器内窝定量孔中多余种子清种过程进行了理论分析和计算机模拟。分析结果表明 ,当种子尺寸较小时 ,内窝定量孔的长度及内窝孔轮的转速是影响内窝定量孔中多余种子清种的主要因素。 One of the main reasons why the hole wheel mechanical seed metering device can not adapt to precision sowing is its poor adaptability to changes in seed size. In this paper, a kind of vertical disk seeder with inner filling type --- a combination of inner hole precision seed metering device is taken as an example to carry out the theoretical analysis and computer simulation of the process of seed clearing in the quantitative seed hole in the inner pit of the seed metering device. The results show that when the seed size is small, the length of the inner hole and the rotation speed of the inner hole wheel are the main factors affecting the clearance of excess seeds in the inner hole of the inner nest.