基于摆线针轮传动的同轴异速单螺杆挤出机的仿真分析  

Simulation analysis of coaxial allometric single screw extruder based on cycloidal pin wheel drive

作　　者：李垚 王丽艳[1] LI Yao;WANG Liyan(School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China)

机构地区：[1]沈阳化工大学机械与动力工程学院,沈阳110142

出　　处：《中国油脂》2025年第3期89-94,109,共7页China Oils and Fats

基　　金：辽宁省自然科学基金项目(2021-MS-253)。

摘　　要：为改善传统单螺杆挤出机在大豆蛋白加工过程中混合性能较差的问题,基于摆线针轮传动设计了一种同轴异速单螺杆结构,以提升单螺杆挤出机的挤出品质。以传统单螺杆为参照对象,运用SolidWorks软件建立对应的几何模型,基于有限元法,运用ANSYS/CFX软件模拟大豆蛋白在流场中的运动情况,借助CFD-Post软件提取流场模拟数据,通过对比分析压力场、速度矢量场和流线场、剪切应变速率和回流系数判定同轴异速单螺杆挤出机的挤出性能。结果显示:同轴异速单螺杆挤出机建压能力是传统单螺杆挤出机的1.22倍,变速输送段有效减缓了物料的流动速度,物料在同轴异速单螺杆挤出机变速输送段的停留时间是传统单螺杆挤出机的1.86~2.19倍;传统单螺杆挤出机平均剪切应变速率是同轴异速单螺杆挤出机变速输送段的3.19倍,同轴异速单螺杆挤出机有效改善了大豆蛋白因剪切稀化现象而停留时间缩短的问题;同轴异速单螺杆挤出机的回流系数(0.46)远高于传统单螺杆挤出机的,分布混合性能更优。综上,同轴异速单螺杆挤出机中变速输送段的存在增强了建压能力,延长了停留时间,改善了分布混合性能。To improve the poor mixing performance of traditional single screw extruder in soybean protein processing, a coaxial allometric single screw structure based on cycloidal pin wheel drive was designed to improve the extrusion quality of single screw extruder. Taking the traditional single screw as the reference object, the corresponding geometric model was established by SolidWorks software. Based on the finite element method, the motion of soybean protein in the flow field was simulated by ANSYS/CFX software, and the flow field simulation data was extracted by CFD-Post software. The extrusion performance of the coaxial allometric single screw extruder was determined by comparing the pressure field, velocity vector field and streamline field, shear strain rate, and reflux coefficient. The results showed that the pressure-building capacity of the coaxial allometric single screw extruder was 1.22 times that of the traditional single screw extruder, the variable speed conveying section effectively slowed down the flow speed of the material, and the residence time of material in the variable speed conveying section of coaxial allometric single screw extruder was 1.86-2.19 times that of the traditional single screw extruder. The average shear strain rate of the traditional single screw extruder was 3.19 times that of the variable speed conveying section of coaxial allometric single screw extruder, and the coaxial allometric single screw extruder could effectively improve the shortening of the residence time of soybean protein due to shear thinning phenomenon. The reflux coefficient of coaxial allometric single screw extruder (0.46) was much higher than that of traditional single screw extruder, and the distribution mixing performance was better. In summary, the existence of a variable speed conveying section in the coaxial allometric single screw extruder enhances the pressure-building capacity, prolongs the residence time, and improves the distributed mixing performance.

关 键 词：同轴异速 单螺杆 有限元法 回流系数 分布混合 

分 类 号：TS223[轻工技术与工程—粮食、油脂及植物蛋白工程] TS222.1[轻工技术与工程—食品科学与工程]