摘 要

随着高技术产业的飞速发展，粉体技术开始受到人们的重视，并逐渐发展成为高技术产业的技术基础。粉体增密作为粉体加工过程中的一个关键环节，有着极其重要的研究意义。本文的内容主要在于对辊增密机的结构设计。首先从粉体基本特性入手，介绍了粉体颗粒的形态特征，包括了颗粒粒度、颗粒形状、形状系数以及颗粒形貌表征，随后是颗粒粒度的测量方法。粉体力学是该设计另一个关键所在，我们需要了解粉体的摩擦特性，从而通过试验测得设计中所选用粉体物料的内摩擦角、壁摩擦角和咬入角。紧接着就开始着手对辊增密机结构参数的设计，在此设计过程中，根据原材料的性质以及实际生产的需求确定各部分结构。

关键词：粉体 颗粒 增密 轧辊

Abstact

With the rapid development of high-tech industry, powder technology has been paid great attention to, and gradually developed into a technical basis for high-tech industries. As a key link in the process of powder processing, powder densification has an extremely important significance. The main content of this paper is to design the structure of the roller. Begin with the basic characteristics of the powder, the paper introduce the shape characteristics of the powder particles, including particle size, particle shape, shape coefficient and particle morphology characterization, and then particle size measurement methods are introduced. Powder mechanics is another key of this design, we need to understand the friction characteristics of the powder, so that we can measure the internal friction angle, wall friction angle and the bite angle of the powder material by the test,which are needed in the design. Then the design of the structure parameters of the roller is set up. In the design process, according to the nature of the raw material and the demand of the actual production, the structure of every part is determined.

Key words: Powder;Granule;Densification;Roller

目录

摘要...............................................................I

Abstract.........................................................II

第一章 粉体技术..................................................1

1.1粉体技术的背景及发展..........................................1

1.1.1粉体工程..................................................1

1.1.2粉体工程的研究目的......................................1

1.1.3粉体技术的发展趋势......................................1

1.2粉体的基本特性和表征..........................................2

1.2.1粉体的概念................................................2

1.2.2颗粒的形态特性............................................2

1.2.2.1颗粒粒度..............................................2

1.2.2.2颗粒形态..............................................3

1.2.2.3颗粒的形状系数........................................3

1.2.2.4颗粒表面形貌分形表征..................................4

1.2.3比表面积..................................................5

1.2.3.1孔径与孔隙率..........................................5

1.2.3.2比表面积..............................................5

1.2.4颗粒粒度和形状的测量方法..................................5

1.3粉体力学......................................................7

1.3.1内摩擦角..................................................7

1.3.2安息角....................................................8

1.3.3壁摩擦角和滑动摩擦角......................................8

1.3.4运动摩擦角................................................8

第二章 常见增密机的类型及特点

2.1双螺杆挤压增密机.............................................10

2.1.1工作原理.................................................10

2.1.2特点.....................................................10

2.2辊压增密机...................................................10

2.2.1工作原理.................................................10

2.2.2特点.....................................................11

第三章 对辊增密机的设计........................................12

3.1对辊增密机主要参数的计算.....................................12

3.1.1物料输送阶段.............................................12

3.1.2二次增密阶段.............................................14

3.1.3选取电动机和减速器.......................................17

3.2设计带传动...................................................17

3.2.1设计V带.................................................17

3.2.2确定大小V带轮的结构.....................................20

3.3轴的设计.....................................................21

3.3.1确定联轴器...............................................21

3.3.2设计长轴的结构...........................................21

3.3.3轴的周向定位.............................................23

3.4齿轮传动设计.................................................24

3.4.1确定齿轮结构.............................................24

3.4.2校核齿根弯曲强度.........................................24

3.5轴的强度校核.................................................26

3.6轴承校核.....................................................28

结语..............................................................30

参考文献.........................................................31

致谢..............................................................33

第一章 粉体技术

1.1粉体技术的背景及发展

1.1.1粉体工程

粉体工程是21世纪以来逐渐发展起来的一门新兴学科，它是以粉体为研究对象，通过研究粉体的性质、用途、制备以及加工处理，使得粉体在越来越多的领域有着不可替代的作用^[1]。它涉及了化学、力学、物理学、机械工程学、数学等多个学科，涵盖了破碎、超细粉碎、混合、分散、表面改性、干燥、增密、造粒、包装、输送等多个技术环节。作为一门在工业上实用性超强且涉及多个学科，并且极具研究意义的综合性学科，粉体工程越来越受到人们的关注。

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