关键词: 红三叶种子, 单籽丸化合格率, 工作参数优选, 单籽抗压强度, 多目标优化

Abstract: In view of the problems of low pelleting qualification rate and difficulty in optimizing pelleting equipment parameters, pelleting qualification rate and compressive strength of single seed were taken as performance indicators for pelleting coating. A multiobjective optimization method was used to optimize the working parameters of pelleting coating for red clover seeds in this paper. The performance indicators of pelleting and coating under different working parameters of the coating pot were obtained by quadratic orthogonal test. The corresponding secondorder regression equation was established with Design-Expert software, and the single objective optimization of the regression model was carried out. The results showed that pelleting qualification rate and compressive strength model from a single seed was feasible and can accurately predict the pelleting and coating properties of red clover seeds. The relative error between the prediction value of pelleting qualification rate for a single seed and the physical test value was 0.15%, and the relative error between the predicted compressive strength of a single seed and the physical test value was 5.85%. Through the multiobjective optimization analyses, the optimum working parameters of red clover seeds were determined as follows: the vibration frequency of the coating pot was 15 Hz, the rotating speed of the coating pot was 59 r/min, and the inclination of the coating pot was 35°.

Key words: red clover seeds, singleseed pelletizing pass rate, preferred working parameters, singleseed compressive strength, multiobjective optimization