Authors

Abstract

In order to quantitatively describe the influence between the mixing process and the pelleting quality of the vibration pelletizer, this paper uses EDEM to conduct a numerical simulation study on the uniformity of the seeds and powder mixing of the pelleting machine under vibration force field. Meanwhile, a single factor test was established to verify the feasibility of numerical simulation. The results show that the coefficient of variation CV is the smallest and the mixing uniformity between the seeds and powder is the highest when the vibration frequency is 20Hz, the rotation speed is 45r/min, the tilt angle is 40° during numerical simulation. The pelleting qualified rate J and single seed rate P as the test index of the mixing uniformity of seed pelleting shows the optimum value in the single factor test, EDEM can be used to analyse the mixing uniformity and pelleting quality in pelletizer. The results of orthogonal experiment indicated that the best combination of parameters was obtained as follows: vibration frequency of 20Hz, rotation speed of 45r/min and tilt angle of 40°, the mixing uniformity of seeds and powder and the pelleting quality of Agropyron seeds are the highest. This study can effectively provide reference for design of pelleting machine of small seeds under vibration force field.

Abstract in Chinese

为了定量描述振动丸化包衣机混合过程与丸化包衣质量间的影响规律，本文采用EDEM对丸化包衣机在振动力场作用下的种、粉混合均匀度进行数值模拟研究，同时利用单因素试验验证数值模拟的可行性。结果表明：当丸化包衣机的振动频率、包衣锅转速、包衣锅倾角分别设定为20Hz 、45r/min、40°时，变异系数Cv在数值模拟过程中均出现最小值，表明种、粉颗粒间达到较优的混合均匀度；丸化合格率J和单籽率P作为种子丸化包衣混合程度的试验评价指标在单因素试验中均表现出最佳值，EDEM可以用于丸化包衣机混合均匀程度及丸化质量的数值模拟分析。正交试验结果得到振动丸化包衣机最优工作参数组合：振动频率20Hz、包衣锅转速为45r/min、包衣锅倾角为40°，在此工作参数组合下种子与粉料能达到较为理想的混合均匀度，冰草种子丸化包衣质量较高，研究结果可为振动作用下小粒种子的丸粒化包衣机设计提供参考依据。