带式输送机自动张紧装置的动态特性研究-机械设计及理论专业论文.docxVIP

万方数据 万方数据 目录 第一章 绪论 1.1 概述··································································1 1.2 张紧装置的发展及研究现状··············································1 1.3 研究张紧装置动态特性的必要性··········································5 1.4 课题的来源与目的······················································6 第二章 自动张紧装置的理论分析·················································7 2.1 张紧装置对带式输送机的影响············································7 2.2 输送机运行中的各种阻力················································8 2.3 输送带的张紧力分析···················································10 2.3.1 正常运行时的张力分析···········································13 2.3.2 启动过程中的张力分析···········································13 2.3.3 制动过程中的张力分析···········································14 2.4 输送带的动力学模型···················································14 2.4.1 输送带的静动特性分析···········································14 2.4.1.1 输送带的静特性分析·······································15 2.4.1.2 输送带的动特性分析·······································15 2.4.2 输送带的数学模型···············································16 2.5 Kelvin 模型参数的测定方法 20 2.5.1 动态拉伸法·····················································21 2.5.2 自由振动法·····················································21 2.5.3 应力波传播速度测量法···········································23 第三章 自动张紧装置的设计····················································23 3.1 自动张紧装置总体设计及工作原理·······································23 3.1.1 自动张紧装置设计···············································23 3.1.2 张紧装置工作原理···············································24 3.2 张紧装置工作方式·····················································28 3.3 自动张紧装置的特点···················································29 第四章 液粘调速离合器的理论分析··············································29 4.1 液体粘性传动的基础理论···············································29 4.2 液粘调速离合器摩擦特性研究及参数设计·································31 4.2.1 油膜受力分析···················································31 4.2.2 摩擦片材料·····················································33 4.2.3 摩擦片转矩计算·······