摘要卧式螺旋卸料沉降离心机应用范围逐渐增大，应用前景广阔，已较成熟地应用在工业、农业、医学、食品等各个领域，与我们的生活有着越来越密切的关系。螺旋输送器是卧螺离心机的关键构件。螺旋输送器的结构、形状、材料影响了它的性能参数，确定了它的分离性能，决定了它的使用寿命。所以，对卧螺离心机的螺旋输送器进行静力、振动等分析具有重要的实际意义。86660

本文将沉降式离心机与过滤式离心机的优点结合起来，使其在两个不同加工阶段发挥各自优点，用Pro/E对螺旋输送器进行三维建模，利用Ansys workbench对其进行有限元仿真。通过Ansys workbench对螺旋输送器三维整体进行静力分析和模态分析，并且对其进行了参数影响分析。本文通过对螺旋输送器三维在离心力、正压力、摩擦力等4种工况下进行分析，得出了螺旋输送器在各个工况下的应力强度及变形，并且对其强度和变形进行校核。对螺旋输送器三维进行模态分析，得出前6阶固有频率和振动特性，确保其远离临界转速。本文还改变螺旋输送器叶片厚度和导程，研究其与螺旋输送器强度和变形间的关系；改变螺旋输送器内筒壁厚，研究其对固有频率的影响，为螺旋输送器的优化提供依据。

毕业论文关键词：有限元；卧螺离心机；静力分析；模态分析

Abstract  Decanter centrifuge is widely used in industry,agriculture,medicine,food and other fields,in which the screw conveyor is the key component。The structure,shape and materials have a significant influence in the performance parameters,separation performance and service life of the decanter centrifuge。Therefore,the analysis of static force and vibration of decanter plays an important role。

This paper will combine the advantages of drum centrifuge and sieve centrifuge in different processing stages and model the screw conveyor with pro/E。We also use Ansys workbench for the finite element simulation。The Ansys workbench was used for the anaysis of static force,vibration and parameter influence of the screw conveyor。In this paper,through the 3D analysis of screw conveyor  in the centrifugal force,positive pressure,friction and so on,wn get the stress and deformation of the screw conveyor under various working conditions and we check the strength and deformation。 After the 3D modal analysis of the screw conveyor ,we get the first 6 order natural frequency and vibration mode,ensuring it is far away from the critical speed。In this paper,we also change the blade thickness and guide of the screw conveyor and study the influence on the deformation and stress;we also change the cylinder wall thickness of the screw conveyor and study the influence on the natural frequence,providing a basis for the optimization of the screw conveyor。

Keywords: finite element; decanter centrifuge; the analysis of static force; the nanlysis of modal analysis

目  录

第一章 绪论----1

1。1 课题来源 1

1。2 选题的目的和意义 1

1。3 卧螺离心机研究近况及其存在的问题 2

1。4 本课题研究的方法与主要内容 3

第二章 有限元模型建立------5

2。1 卧螺离心机的简单原理和基本结构 5

2。1。1过滤离心机的简单原理和基本结构 5

2。1。2 沉降离心机的简单原理和基本结构 6

2。2 螺旋输送器 7

2。2。1 螺旋输送器的结构设计 7

2。2。2 螺旋输送器基本参数