Influence of rotational speeds of threshing drum on threshing quality and strips yield of upper leaves of flue-cured tobacco CB-1

FENG Yongxin; CUI Ying; LI Kedu; ZHANG Tengjian; LU Minrui; WANG Fang; YANG Yang; LI Meng

doi:10.12187/2025.01.010

Abstract：In order to improve the threshing quality and strips yield of the upper leaf of flue-cured tobacco CB-1,the influence of rotational speeds of threshing drum on leaf structure,stem content and yield was determined.Uniform experiment was used to design different rotational speed combinations,and the experiment was carried out on the threshing and redrying line.The linear regression model of the first to fourth rotational speed and the leaf structure,stem content and yield was established by regression analysis,and the model was used to optimize and verify the rotational speed parameters of the fourth-stage threshing drum.The results indicated that tyhe linear regression models of large strip rate,medium strip rate,large-to-medium strip rate and fragment rate with rotational speed were significant at the P＜0.01 level,and the linear regression model of stem content in the leaf with rotational speed was significant at the P＜0.05 level.The correlation coefficient of the linear regression model of stripsyield and rotational speed was 0.83,but it was not significant at the P＜0.05 level.The large strip rate,medium strip rate,and large-to-medium strip were were influenced by the interaction between the first and second rotational speed.The fragment rate was closely related to the primary and tertiary rotational speed.The stem content in the leaf was main influenced by the primary beater speed.The strips yield was main influenced by the interaction between the primary,secondary,and quaternary rotational speed.The ideal rotational speeds for the first to fourth levels were determined to be 585 r/min,590 r/min,680 r/min,and 690 r/min,respectively.Compared to the present rolling speed combination,these adjustments resulted in a 9.59％reduction in large strip proportion,an 17.41％increase in medium strip proportion,and an 1.33％increase in strips yield.This optimization significantly improved the threshing quality of upper leaves of tobacco CB-1.