啮合同向差速双螺杆挤出机挤出聚乳酸流场分析  

Analysis of the flow field in a meshing and co-rotating differential twin screw extruder for extruding polylactic acid

作　　者：代祥基 刘子豪 黄志刚[1,2] DAI Xiangji;LIU Zihao;HUANG Zhigang(School of Artificial Intelligence,Beijing Technology and Business University,Beijing 100048,China;Plastic Beijing Municipal Key Laboratory of Health and Safety Quality Evaluation Technology,Beijing 100048,China)

机构地区：[1]北京工商大学人工智能学院,北京100048 [2]塑料卫生与安全质量评价技术北京市重点实验室,北京100048

出　　处：《食品与机械》2024年第4期59-64,83,共7页Food and Machinery

基　　金：国家自然科学基金面上项目(编号:32172277)。

摘　　要：目的:探究不同差速比的螺杆组在流道性能上的差异,明确差速对聚乳酸材料挤出性能的影响。方法:应用Solidworks软件建立4组差速双螺杆组,通过Fluent软件进行网格划分和有限元数值模拟,使用CFD-post软件分析计算结果,并对其性能进行验证。结果:当进出口压力分别为0.2,0.5 MPa,单头基准转速为30 r/min时,差速比为1∶2和1∶3的螺杆在不同性能下各有优劣,螺杆的产量和机筒内压力在差速比为1∶2时具有优势,螺杆的混合能力在差速比为1∶3时具有优势。结论:对比传统双螺杆挤出机,差速双螺杆挤出机对聚乳酸材料的挤出性能为正向影响,可作为全新的聚乳酸改性设备。Objective:To explore the differences in runner performance of screw groups with different differential ratios,and to clarify the effects of differential speed on the extrusion performance of polylactic acid materials.Methods:Four groups of differential twin screw groups were established by Solidworks software,meshing and finite element numerical simulation were carried out by Fluent software,the calculation results were analyzed by CFD-post software,and the contours and discounted plots of various characterization parameters were combined,and they were verified by experiments.Results:Under the condition that the inlet and outlet pressures were 0.2 MPa and 0.5 MPa,and the reference speed of a single head was 30 r/min,the screws with a differential ratio of 1∶2 and 1∶3 had their own advantages and disadvantages under different properties,and the screws with a difference ratio of 1∶2 for output and pressure in the barrel had an advantage.In terms of mixing capacity,a screw with a differential ratio of 1∶3 had an advantage.Conclusion:Compared with the traditional twin-screw extruder,the differential twin-screw extruder has a positive impact on the extrusion performance of polylactic acid materials,and can be used as a new polylactic acid production equipment.

关 键 词：聚乳酸 双螺杆挤出机 差速 啮合同向 有限元数值模拟 流道 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]