关键词: 制粒机, COMSOL, 数值模拟, 结构参数, 正交试验, 权矩阵分析法

Abstract: Pellet mill is one of the important equipment in the feed industry, and its structural parameter has impact on feed molding. In order to further optimize the granulation performance, this article used COMSOL finite element analysis software to analyze and simulate the extrusion process of the material, and designed a set of orthogonal experiments of L9 (34) to study the influence of the inner diameter of the ring die, die hole length, pressure roll diameter and die roll gap on forming performance, then used the weight matrix analysis to obtain a better parameter combination and verified it. The results showed as follows: ① the simulation of the internal model of the granulator could effectively reflect the movement state of the material in actual work. ② The order of the structural factors that affected the granulation performance from large to small was die roll gap, die hole length, pressure roll diameter, ring die inner diameter. ③ The optimal combination of granulation was ring die inner diameter 425 mm, die hole length 54 mm, pressure roller diameter 178 mm, die roller gap 1.5 mm. Compared to before optimization, the molding rate of the pellet mill had been improved. It was concluded that the simulation test and optimization method adopted in this paper had certain practical effects, which provided method reference for the internal molding simulation analysis of the granulator and the subsequent structural design and parameter optimization. 

Key words: pellet mill, COMSOL, numerical simulation, structure parameters, orthogonal test, weight matrix method