摘要
对比分析了啮合同向双螺杆挤出机新型滑动支撑元件和滚动支撑元件的结构特点,通过Polyflow流场模拟,得出了2种支撑元件的压力分布与剪切速率分布,基于流体动力学原理及流变学原理分析了支撑元件的压力场与剪切速率场,重点讨论了物料的熔体流动速率对2种支撑元件压力消耗的影响。结果表明:支撑元件属于耗压元件,与双头螺纹元件相比,3种元件的流道出口-入口压差绝对值大小关系为双头螺纹元件>>滑动支撑元件>滚动支撑元件;与捏合块元件相比,3种元件流道的加权平均剪切速率大小关系为捏合块元件>>滚动支撑元件>滑动支撑元件,支撑元件对物料的分散混合不会造成明显的影响;支撑元件更适用于加工高熔体流动速率物料的螺杆组合。
Comparative analysis was applied on the structure characteristics of the sliding bearing element and rolling bearing element of twin-screw extrude. Based on the principle of fluid dynamics and the principle of rheology,the pressure field and shear rate field were analyzed,and the influence of melt flow rate on the pressure consumption of two kinds of bearing elements was discussed. The results showed that tile bearing element had belonged to consumption pressure elements. The size order of the absolute value of the outlet-inlet pressure difference between the three elements was double-screw element 〉 〉 sliding bearing element 〉 rolling bearing element. The size order of the absolute value of the weighted average shear rate between the three elements was kneading block 〉 〉 rolling bearing element 〉 sliding bearing element. Both bearing elements were more suitable in screw configuration for extruding high melt flow rate material.
出处
《塑料》
CSCD
北大核心
2017年第5期13-17,共5页
Plastics
关键词
双螺杆挤出机
支撑元件
流场模拟
压力场
剪切速率场
twin screw extruder
bearing element
flow field simulation
pressure field
shear rate field
