谷子收获机风筛式清选装置试验分析

为了减少谷子联合收获的清选损失，对谷子收获机风筛式清选装置进行了试验分析。运用参数可调的风筛式谷子清选装置，以清选风速、风向、筛分振幅和曲柄转速为试验因素，以籽粒损失率和含杂率为试验指标，对谷子联合收获机脱出物进行了清选试验。试验结果表明:籽粒损失率随清选风速、筛分振幅、曲柄转速的增大而增大，随清选风向角度的增大呈先增大后减小再增大趋势；含杂率随清选风速、筛分振幅、曲柄转速的增大而减小，随清选风向角度的增大呈先减小后增大再减小趋势；最优清选工作参数为清选风速4.19 m/s、清选风向30.3°、筛分振幅22 mm和曲柄转速218 r/min，籽粒损失率为2.02 %，含杂率为8.01 %。该研究为谷子联合收获机清选装置结构与工作参数设计提供参考。 

Experimental Analyses to Air-and-sieve Cleaning Device of Foxtail Millet Combine Harvester

To decrease the cleaning loss of the foxtail millet combine harvester, we analyzed the air-and-sieve cleaning device of millet harvester by experiments. We conducted the cleaning experiments via the adjustable cleaning device. The experimental factors include airflow velocity, airflow direction, vibrating amplitude and vibrating frequency. The experimental indexes include kernel loss rate and impurity rate. The experimental results showed that the kernel loss rate was increasing with the increase of airflow velocity, vibrating amplitude and vibrating frequency, and the kernel loss rate showed the trend of firstly increasing and then decreasing with the increase of airflow direction. The impurity rate was decreasing with the increase of airflow velocity, vibrating amplitude and vibrating frequency, and the impurity rate showed the trend of firstly decreasing and then increasing with the increase of airflow direction. The optimal cleaning working parameters were recorded as that the airflow velocity was 4.19 m/s, and the airflow direction was 30.3°, and the vibrating amplitude was 22 mm, and the vibrating frequency was 218 r/min, and then the kernel loss rate was 2.02 %, and the impurity rate was 8.01 %. This research can provide reference for the design on structure and working parameters of the cleaning device for the foxtail millet combine harvester.