各级打叶风分单元分离片烟的尺寸分布变化规律

利用五打十一分打叶机组对上部烟配打模块进行梗叶分离,研究了打叶去梗工序中各级打叶风分后片烟的尺寸分布变化规律。结果表明:各级打叶风分单元分离出的片烟尺寸在各面积区间内的比例变化趋势基本一致;其中第一、二级打叶单元内各风分口的大中片比例均94%,较为稳定,且片烟特征尺寸及超大片比例均随风分级数的增加呈上升趋势,第三、四/五级打叶单元内片烟特征尺寸及超大片比例显著降低,小片率明显升高;各级打叶单元汇总片烟的特征尺寸及均匀性随打叶级数增加逐渐降低。

Variations of size distribution of tobacco strips separated from different threshing and pneumatic separation unit

In order to study the variation of size distribution of tobacco strips from different threshing and separation unit, an upper blend tobacco formula was introduced into threshing machine with five stages of threshing unit and eleven pneumatic separators. The results showed that the size proportion of tobacco strips separated from different pneumatic separators exhibited a similar change trend. Moreover, in the first and second stage threshing unit, the large and middle size particle content could reach more than 94% with good stability. Meanwhile, the characteristic size tobacco strips and the proportion of tobacco strips with size bigger than 44.5 mm increased with pneumatic separation stage for the threshing units of the first and second stages. However, in the threshing units of the third and forth/fifth stages, the characteristic size tobacco strips and the proportion of tobacco strips with size bigger than 44.5 mm decreased dramatically, accompanied with a significant increase in proportion for small size tobacco strips. Furthermore, the characteristic size of strips collected from different threshing and separation unit and the corresponding uniformity of tobacco strips size were both decreased with stages of threshing unit.