新型贯流式谷物清选装置中物料运动轨迹试验研究

Experimental Study on Motion Trail of Materials in New Cross-flow Grain Cleaning Device

设计一种新型贯流式谷物清选装置,采用高速摄像对该清选装置中谷物脱出物的运动轨迹进行试验研究。确定清选装置的五个试验因素,按照混合水平正交试验方案进行谷物脱出物的气流清选,通过高速摄像设备记录谷粒、短茎秆、颖壳的运动轨迹,并与数值计算得到的理论运动轨迹进行比较。以谷粒与杂质在水平方向上的距离差为清选指标,对试验数据进行极差和方差分析得到各因素对清选指标的影响大小,其依次为两喂料辊转动中心连线与水平面夹角,气流扩展通道类型,贯流风机的电机频率,两喂料辊的辊间距,喂料辊驱动电机频率。当两喂料辊转动中心连线与水平面夹角为10°,气流扩展通道选I型,贯流风机的电机频率设为60Hz,两喂料辊的辊间距调整为4mm,喂料辊驱动电机频率为60Hz时,谷物与杂质的分离间距值最大,其值为125.1mm。

This paper designs a new cross-flow grain cleaning device; conducts experimental study on the motion trail of prolapsed object of grain in the cleaning device with high-speed photography; determines five experimental factors of the cleaning device; conducts airflow cleaning of prolapsed object of grain according to the orthogonal test table at mixed level, records the motion trail of grain, short stalk and glumes with high-speed photographic equipment and makes a comparison with the theoretical motion trail obtained by numerical calculation; conducts range analysis and variance analysis on test data with the distance difference of grain and impurities horizontally as the cleaning index and obtains the degree of influ- ence of various factors on the cleaning index, respectively included angle of the line connecting rotation centers of two feeling rolls and the horizontal plane, type of airflow extension channel, motor frequency of cross-flow fan, spacing between two feeding rolls and driving motor frequency of feeding roll in proper order. When the included angle of the line connecting rotation centers of two feeling rolls and the horizontal plane is 10°, type of airflow extension channel is I, motor frequency of cross-flow fan is 60 Hz, spacing between two feeding rolls is 4 mm and driving motor frequency of feeding roll is 60 Hz, the separation distance between grain and impurities is maximum, the value of which is 125.1 ram.