梯形螺槽双螺杆几何造型的研究

对梯形螺槽同向和异向旋转双螺杆三维实体造型进行了研究,并对其中双螺杆设计、双螺杆中物料流动分析中的应用进行了探讨。结果表明,双螺杆几何造型程序具有很强的适用性和可操作性,为各种双螺杆几何参数的合理选择以及科学设计提供了强有力的工具。     

双螺杆挤出炸药模拟物的流场模拟分析及实验研究

为解决含超细粉体炸药模拟物中各组分的均匀分散混合问题,采用双螺杆挤出机试验及ANSYS有限元流场模拟分析,首先用平板流变仪测得炸药模拟物在特定温度下的流变参数,运用ANSYS的Fluid Dynamics模块对炸药模拟物在同向双螺杆挤出机的混合挤出流场进行模拟,以累积最大拉伸速率、加权平均剪切应力表征混合能力的大小。基于模拟结果,用同向双螺杆挤出机对炸药模拟物的混合流场进行实验,对经历不同混合流场的炸药模拟物进行SEM扫描电镜分析。结果表明,大导程和反向的螺纹元件能够提供较大的剪切和拉伸作用,有利于炸药模拟物的分散混合。     

双螺杆挤出机传动系统分析及高扭矩设计探讨

介绍了双螺杆挤出机传动系统的发展情况,对双螺杆传动系统进行了归类与分析,并着重阐述了高扭矩型双螺杆挤出机传动系统的设计及技术关键。     

双螺杆塑料挤出机的设计要点

本文在分析双螺杆挤出机特点的基础上,根据主要参数设计原则,参考国内、外现有资料,提出了设计要点,并进行了双螺杆挤出机的设计。     

SJSZ-55锥形双螺杆挤出机螺杆的设计

锥形双螺杆挤出机是塑料加工的一种重要机型。对SJSZ-55锥形双螺杆挤出机的螺杆进行了设计,研究结果可以指导同类螺杆的设计。     

高分散混合元件设计及混合性能的研究

根据啮合同向双螺杆挤出机的啮合原理,设计了一种高分散混合双螺杆元件。运用Polyflow有限元分析软件对该双螺杆元件的3种螺杆构型的流场进行了模拟分析,并且对这3种螺杆构型进行了实验研究。研究表明,错列角为150°的元件的分散混合性能最好,其次是错列角为30°的元件,错列角为90°的元件的分散混合性能最差。     

挤压过滤设备双螺杆的有限元分析

在螺旋挤压过滤机的设计中,采用PROE建模构建双螺杆的三维模型,实行从PROE到ANSYS的无损导入,并在此基础上进行螺杆的数值模拟和有限元分析,得出双螺杆的应力和应变云图,对双螺杆的优化设计与研究提供参考.     

同向双螺杆几何参数设计探讨

本文首先对同向双螺杆各有关几何面积及体积进行计算和讨论,在此基础上展开几何参数设计的探讨,提出一些准则供工程设计人员参考.     

锥形双螺杆挤出机螺杆的优化设计

系统地介绍了锥形双螺杆挤出机螺杆的基本参数以及各功能段参数的设计依据,并针对SJSZ–35锥形双螺杆挤出机的螺杆进行了优化设计,对同类螺杆的设计具有一定的指导意义。     

双螺杆挤出技术在冻胶纺丝工艺中的应用

对双螺杆挤出机用于冻胶纺丝，其结构特性及相关设计多数进行了详细的分析和探讨，同时提出了一些参考建议，经特殊设计加工后的双螺杆挤出机应用在冻胶纺丝工艺上，成功地纺制出高强高模聚乙烯纤维。双螺杆挤出技术用于冻胶纺丝工艺已具备条件并切实可行。     

啮合型同向旋转双螺杆螺纹头数选择及螺杆间隙设计

本文从双螺杆啮合几何学出发,分析了啮合型同向旋转双螺杆各功能段螺纹头数选择准则,探讨了这类双螺杆挤出机中三种典型螺杆间隙的设计方法。这些准则及方法可直接用于指导螺杆结构设计。     

对双螺杆挤出机生产硬PVC制品的探讨

文章在研究了双螺杆挤出机各段中物态变化及作用的基础上,分析了目前硬PVC制品生产中使用双螺杆挤出机的一些问题,如平行双螺杆挤出机能否用于生产异型材、是否一定要使用定量给料器、挤出机排气口冒料的工艺控制及螺杆设计等问题。     

Mechanisms of mixing in single and co-rotating twin screw extruders

Previous experimental studies have revealed that the mixing efficiencies of widely used continuous processors such as the single and twin screw extruders depend on the types of screw elements, which are utilized. It is generally recognized that the basic single screw extruder and the fully-fighted sections of the fully-intermeshing co-rotating twin screw extruders are not efficient mixers, in contrast to the specialized mixing elements such as the kneading discs used in co-rotating twin screw extruders. However, no simulation techniques were available to characterize quantitatively and rigorously the mixing efficiencies of continuous processors. In this study, we have solved the three-dimensional equations of conservation of mass and momentum, and utilized various tools of dynamics to analyze the mixing occurring in single and co-rotating twin screw extruders. It is shown that simulation methods can indeed capture the relative differences in the mixing mechanisms of continuous processors like the single and twin screw extruders. The ability to distinguish quantitatively between the distributive mixing capabilities of various continuous processors should facilitate numerical testing of new continuous mixer designs, optimization of operating conditions and geometries of existing mixers and the material-specific design of new mixers.     

三聚氰胺泡沫双螺杆反应挤出机设计

针对三聚氰胺泡沫塑料连续化生产的工艺要求及技术难点,通过实验确定了三聚氰胺泡沫塑料的工业化生产流程,通过计算确定了三聚氰胺反应挤出发泡专用的反应型双螺杆挤出机的关键技术参数。为满足泡沫生产过程中黏度差较大组分的快速均化和反应热的快速移除等要求,专门设计了特殊的反应挤出机筒体和专用混合螺杆元件。通过实际工业化生产检验了流程设计及反应挤出机设计的可行性。     

分流元件几何构型对锥形双螺杆计量段流场的影响

研究了使用两头、四头、六头菠萝形分流元件时锥形双螺杆计量段流场的变化，用有限元数值分析法建立了相应的有限元模型，并用有限元隐式算法进行模拟计算。研究了菠萝形分流块的设置位置、数量、排列方式、大小和形状对压力场、速度场、粘度场的影响，对新型锥形双螺杆计量段分流块的设计有一定的指导作用。     

同向双螺杆挤出机在聚合物脱挥中的应用研究

综述了聚合物脱挥设备的分类和基本情况,并着重介绍了双螺杆挤出机在聚合物脱挥领域中的应用、优点、国内外发展概况及发展趋势等,同时在大量工业化应用的基础上提出了切实可行的同向双螺杆挤出机脱挥工艺,并详细分析了同向双螺杆挤出机主要零部件的设计要求和设计方法。     

Flow field analysis of the kneading disc region in a co-rotating twin screw extruder

Co-rotating, intermeshing twin screw extruders are widely used in polymer compounding and blending. Among the different modules of the co-rotating twin screw extruder, the kneading discs are the dominant ones in determining mixing efficiency. The major difficulty in solving the flow problem in the kneading disc region arises from the complex geometry and the time-dependent flow boundaries as the discs rotate. In this work, a fluid dynamics analysis package—FIDAP—using the finite element method was employed to simulate the flow patterns in the kneading disc region of a Werner & Pfleiderer ZSK-30 co-rotating twin screw extruder. The problem of time dependent flow boundaries was solved by selecting a number of sequential geometries to represent a complete mixing cycle. The flow field was characterized in terms of velocity profiles, pressure distributions, shear stresses generated and a parameter λ quantifying the elongational flow components. The last two parameters are the most important ones in analyzing mixing efficiency. The influence of design variables (stagger angle, right or left handed configuration) and processing conditions (rpm, axial pressure gradient) on the flow characteristics was analyzed.     

双螺杆挤出机在高比例溶剂POE脱挥及挤压造粒中的应用

对双螺杆挤出机在聚烯烃弹性体（POE）制备过程中高比例溶剂脱挥及挤压造粒应用进行了介绍,并经过试验平台验证,探索出“可控分布脱挥技术”,通过脱挥过程中各个区段不同的工艺要求,设置不同的工艺温度和螺杆的组合排列,同时通过合理控制各个区段不同的真空要求;最终利用双螺杆挤出机将POE流体中的高比例溶剂（质量分数为75 %的溶剂）脱挥至50~200 ppm;同时,阐述了在脱挥过程中的技术关键点,这对大型双螺杆脱挥机组的设计起到了良好的技术支撑作用。     

An experimental study of distributive mixing in fully intermeshing,co-rotating twin screw extruders

Co-rotating twin screw extruders are widely used for various mixing and reactive extrusion tasks in polymer processing operations. In this study, the prevailing mixing mechanisms of various screw elements employed in co-rotating twin screw extrusion process, including regular flighted, and reverse and forward kneading disc elements, were experimentally investigated. A direct goodness of mixing technique based on pigmented thermoplastic elastomers and computerized image analysis was used. The results were elucidated in conjunction with mixing indices suitable for image analysis and the continuous mixing process. Significant differences in the distributive mixing characteristics of various screw elements were revealed.