Research on key technology for controlling proportion of large-sized tobacco leaves after threshing
In order to solve the problem of excessive large leaf ratio in tobacco leaves after destemming,a technical scheme which made the threshed large tobacco leaves filtered by vibrating screen machine and re-threshed by image monitoring roll machine was presented.A device for sorting and reprocessing tobacco flakes was designed,and the influence of different control parameters on the tobacco leaves after threshing was studied by experiment.The results showed that:(1)Increasing the size of screen hole diameter in the vibrating screen machine contributes to the separation of large leaves;(2)The size and shape of grid bars in the re-threshing machine have a more significant impact on the re-threshing effect compared to the rotation speed.Using a re-threshing machine with circular grid bars and a 2.0-inch opening can achieve a large leaf ratio below 30%,a medium leaf ratio above 45%,and a dust content below 0.3%after re-threshing;(3)Increasing the rotation speed of the threshing machine and increasing the proportion of large leaf fraction in the re-threshing process help reduce the large leaf ratio,but they both lead to a decrease in medium leaf ratio and an increase in dust content.The optimal performance was observed when the rotation speed of the threshing machine and the proportion of leaf fraction were controlled at around 40 Hz and 50%,respectively.
threshing and redryingtobacco leaves after threshinglarge leaf ratiomedium leaf ratiodust loss
NETL
NSTL
万方数据
