基于热固耦合的双螺杆挤压机机筒有限元分析  

Finite Element Analysis of Twin-screw Extruder Cylinder Based on Thermo-mechanical Coupling

作　　者：张培建 邢鸿雁 卫静怡[1,2] ZHANG Pei-jian;XING Hong-yan;WEI Jing-yi(Tianjin Key Laboratory of Integrated Design and Online Monitoring of Light Industry and Food Engineering Machinery and Equipment,Tianjin 300222,China;School of Mechanical Engineering,Tianjin University of Science and Technology,Tianjin 300222,China)

机构地区：[1]天津市轻工与食品工程机械装备集成设计与在线监控重点实验室,天津300222 [2]天津科技大学机械工程学院,天津300222

出　　处：《包装工程》2022年第7期218-224,共7页Packaging Engineering

基　　金：宁夏回族自治区重点研发计划(22019BFF02004)。

摘　　要：目的 研究双螺杆挤压机在食品加工过程中出现卡顿、抱死的原因,为双螺杆挤压机设计及应用提供理论指导。方法 应用ABAQUS软件构建双螺杆挤压机仿真模型,通过传感器反馈的温度值设定温度载荷,同时以双螺杆挤压机运转时的低压工况、正常工况、极限工况分别设定压力载荷,运用热固耦合理论对机筒的温度分布、应力和变形进行仿真分析。结果 在最大温度工况条件下,机筒轴向热变形量为2.356 mm,总热变形量为2.358 mm,x方向上的热变形量为0.1324 mm,y方向上的热变形量为0.1592mm;在最大温度工况和极限压力耦合作用下,机筒总变形量为2.088 mm。温度引起的热膨胀是机筒变形的主要原因,机筒的轴向热变形量与总热变形量相当,并且远大于其他两方向的热变形量;与常温环境相比,在加热温度工况条件下机筒的变形量随着压力的增大而减小。结论 要充分考虑温度对挤压机性能的影响,应用过程中要合理的设置温度参数。The work aims to study the causes of clatter and locking in the food extrusion process of twin-screw extruder, and to provide theoretical guidance for the design and application of twin-screw extruder. ABAQUS software was used to construct the simulation model of the twin-screw extruder. The temperature load was set according to the temperature feedback from the sensor. At the same time, the pressure load was set under the low pressure condition, normal condition and limit condition of the twin-screw extruder. The temperature distribution, stress and deformation of the cylinder were simulated and analyzed by the thermo-mechanical coupling theory. Under the maximum temperature condition, the axial thermal deformation of the cylinder was 2.356 mm, the total thermal deformation was 2.358 mm,the thermal deformation in the x direction was 0.1324 mm, and the thermal deformation in the y direction was 0.1592 mm.Under the coupling effect of maximum temperature condition and ultimate pressure, the total deformation of the barrel was 2.088 mm. The thermal expansion caused by temperature was the main reason for the deformation of the cylinder,and the axial thermal deformation of the cylinder was equivalent to the total thermal deformation, and was much larger than that of the other two directions. Compared with the normal temperature environment, the deformation of the cylinder decreased with the increase of pressure under the condition of heating temperature. The effects of temperature on the performance of the extruder should be considered and reasonable temperature parameters should be set in application.

关 键 词：双螺杆挤压机 机筒 热固耦合 有限元 

分 类 号：TB486[一般工业技术—包装工程] TH114.7[机械工程—机械设计及理论]