基于EDEM的回转组合多层筛筛选过程的离散元分析

回转组合多层筛是粮食和油料的高效清理设备。借助三维建模软件,建立了回转组合多层筛三维实体模型,基于离散元仿真软件EDEM模拟了小麦在筛选过程中的运动情况。改变筛体的运动参数(回转半径、回转频率及筛面倾斜角度),通过数据后处理得到物料中小麦颗粒、杂质颗粒的运动情况,分析各参数对物料推进速度、杂质去除率和小麦提取率的影响。结果表明,回转组合多层筛回转半径在20～25 mm之间、回转频率在6～7 Hz之间、筛面倾斜角度在6°～8°之间时,物料推进速度快、处理量大、除杂效率高、小麦损耗少。研究结果为回转组合多层筛的仿真研究提供数据支持。

Discrete element analysis of EDEM-based rotary combined multi-layer sieve screening process

Rotary combined multi-layer sieve is an efficient cleaning equipment for grain and oil seed. Based on the 3D modeling software, a three-dimensional solid model of the rotary combined multi-layer sieve was established. Based on the discrete element simulation software EDEM, the movement of wheat in the screening process was simulated. The movement parameters of the sieve body (rotary radius, rotation frequency and tilt angle of screen surface) were changed, and the movements of wheat particles and impurity particles in the material were obtained by post-processing of the data. The influences of various parameters on material advancing speed, impurity removal rate and wheat extraction rate were analyzed. The results showed that under the conditions of rotary radius 20-25 mm, rotation frequency 6-7 Hz and tilt angle of screen surface 6°-8°, the material advancement speed was fast and the processing volume was large with high impurity removal efficiency and low lost of wheat. It could provide data support for the simulation study of the rotary combined multi-layer sieve.