【作者】 李猛；

【导师】 薛强；

【作者基本信息】 天津科技大学 ， 机械设计及理论， 2005， 硕士

【摘要】 双螺杆磨浆机以其结构简单、得浆率高、耗能少、用水量少和污染小等优良特性,被称为继盘磨机后的第三代机械制浆设备。国内双螺杆磨浆机设计的研究已经取得一定的成果,但其主要的设计手段仍然是传统的模式。 本文应用CAD/CAE技术进行了双螺杆磨浆机构的设计和分析。首先从系统的角度分析双螺杆磨浆机构的设计过程,建立了磨浆机构设计系统的IDEF0功能模型和IDEF1x信息模型;利用PRO/ENGINEER软件完成了双螺杆磨浆机构的螺杆、芯轴、机筒、轴承座以及其他辅助部分的零件设计和装配设计;在PRO/ENGINEER MECHANISM环境下,进行了螺杆的运动仿真和干涉检验;对不同形式的芯轴和螺杆进行了有限元模拟分析。 对两种不同形式的芯轴进行了有限元应力分析,其中,渐开线花键芯轴较矩形芯轴承载能力好。通过有限元分析优化了芯轴的结构,进而对如何减小芯轴的应力集中提出了建议。同时,采用有限元方法对螺杆进行了接触应力分析。研究了螺棱齿顶圆角和齿根圆角半径对螺杆应力变化的影响,并进一步对螺棱截面进行了优化设计,得出最佳螺棱齿顶圆角和齿根圆角半径值。 本文通过在计算机上构造数字化模型,并且模拟实际工作情况下产品的性能,获得产品的优化设计方案。从而缩短了开发周期、提高了设计效率、设计质量。更多还原

【Abstract】 As an up to date grinder machine, twin-screw grinder has the characters of simple structure, high-powered pulp efficiency, lower cost, less water consumption and lower pollution. A lot of accomplishments have been achieved on twin-screw grinder design. However, traditional design methods are usually used in design of twin-screw grinder.In this thesis, CAD/CAE technologies have been applied in twin-screw grinder design. Firstly, design process was analyzed from the point of system design, and then the system function models and information models were built. Secondly, with the help of PRO/ENGINEER software, the parts including screw element, shaft, machine barrel and bearing block etc, and assembly of mechanism have been accomplished. Also, motion simulation and interference verification of twin screw have been finished. Thirdly, finite element method was applied in the research for the stress distribution of shafts and screws, so their structures were improved.Stress of two kinds of shafts was analyzed. Involute-shaped shaft shows better resistance capability to the pressure than that of rectangle-shaped shaft. Through calculation and analyzing, the best radius of transition angle has been found. With the Finite Element contact analysis method, the stress concentration of twin screws has been investigated. By optimizing the radius of tooth top and root, the stress concentration has been reduced, and the stress distribution has also been ameliorated.Building up computer models of the mechanism, this thesis has simulated the performances of product under actual work circumstance, and acquired optimized results. These shorten the development period, improve design efficiency and quality.更多还原