Authors

Abstract

In this paper, the vertical disk mechanical seed-metering device is taken as the object to optimize the design of seed holding ring. The laboratory test is carried out with seed-metering test bench and high-speed camera system; and the influence law of starting and ending angle, front inclination angle and flexible buffer of seed holding ring on the seed filling performance is studied. The ending angle of seed holding ring shall be consistent with seed throwing angle of seed-metering device, and the starting angle of seed holding ring has a significant effect on seed filling performance. The quality of fill index will first increase and then decrease, reaching the maximum at 35.7°; while miss fill index will first decrease and then increase, and the multiple fill index will be 0% when the starting angle is greater than 50°; and seed damage index will first decrease and then increase. In order to improve seed filling performance, the front end of seed holding ring is treated with inner chamfering. The larger the angle is, the lower the quality of fill index, the higher the multiple fill index and the lower the miss fill index, but the seed damage index will also increase. By setting a flexible buffer in the front end of seed holding ring, the seed damage index can be effectively reduced. When the buffer is 60mm, the seed can be cleaned smoothingly, and the seed damage index will be 0%.

Abstract in Chinese

本文以垂直圆盘机械式排种器为对象，对护种环进行优化设计。利用排种试验台和高速摄像系统进行室内试验；研究护种环的起止角度、前端倾斜角度、柔性缓冲区对充种性能的影响规律。护种环的终止角与排种器的投种角保持一致，护种环的起始角对充种性能具有显著影响，充种合格率先增大后减小，在35.7°时达到最大，漏充率先减小后增大，当起始角大于50°时重充率为0%，破碎率先减小后增大。为了提高充种性能，对护种环前端进行内倒角处理，角度越大，充种合格率越低、重充率越高、漏充率越低，但是破碎率也会增高。通过在护种环前部设置柔性缓冲区，可以有效降低破碎率，缓冲区60mm时，能够顺利清种，且种子破碎率为0%。