气吸式播种机气力系统研究

Study on pneumatic system of vacuum seed planter

气力系统是气吸式播种机的关键部分,决定着播种机的播种质量。文章研究了在不同作业速度下,排种器气室真空度为3、4、5和6 kPa对播种合格率和漏播率的影响规律,结果表明,真空度为5和6 kPa时排种器保持良好工作性能,进而测定真空度为5 kPa时的风量为7.4×10-3～8.0×10-3m3.s-1,真空度为6 kPa时的风量为8.0×10-3～8.8×10-3m.3s-1,根据以上结果绘制气力系统真空度和风量特性曲线,为气吸式播种机风机的选用提供依据。

Pneumatic system is key part of vacuum seed planter and determines planter seed quality. Effects of qualification percent and miss percent on air chamber vacuum of seed metering 3, 4, 5, 6 kPa were studied at different speeds. The results showed that operating performance of seed metering was excellent when air chamber vacuum was 5, 6 kPa, which air flow was respectively 7.4×10-3-8.0×10-3 m3·s-1 and 8.0×10-3-8.8×10-3 m3·s-1, based on the above results, drew characteristic curve of air flow and vacuum for pneumatic system which can provide theoretical basis for choosing fan of planter.