一器多行环槽推送式排种器设计与试验

Multi-line Metering Device with Ring Groove Push Movement

摘要:

设计了一种适用于稻麦等小粒农作物条播的一器多行环槽推送式排种器，分析了排种器的工作原理和种子在出种口的受力情况，确定了排种盘的理论最大转速。以烟农19号小麦为试验对象，研究了单行种子排量、单行排量均匀性变异系数、各行排量一致性变异系数、总排量稳定性变异系数和破损率与排种盘转速的关系。试验表明，单行种子排量随排种盘转速的增大几乎呈线性增加关系。单行排量均匀性变异系数、各行排量一致性变异系数和总排量稳定性变异系数都随排种盘转速的增加呈现先减后增的趋势，并在转速为2.5r/min时最小，分别为28.5%、1.33%和0.51%。种子的破损率随着转速的增加而增加，在转速高于2.5r/min时，破损率增加较为明显。

Abstract:

A multi-line metering device was designed for drill seeding of wheat and rice with ring groove push movement. Working principle of the multi line metering device and force on dropping seed were analyzed, and the theoretical maximum speed of the metering plate was investigated. The Yannong-19 wheat was taken as the testing object, and the relationship among several parameters was studied, which were rotation speed with single-line delivery capacity, coefficient of variation of single-line flow rate, coefficient of variation of flow rate among all lines, coefficient of variation of total flow rate and damage rate through the captive test of seeding device. The experimental results showed that a linear increase was observed with increasing rotation speed. Coefficient of variation of single-line flow rate, flow rate among all lines and total flow rate firstly increased and then descended with increasing rotation speed, and the lowest coefficient of variation (28.5%,1.33% and 0.51%) were observed at 2.5r/min rotation speed. The damage rate increased with the increasing rotation speed, and increased obviously when rotation speed was higher than 2.5r/min.