液压挖掘机液压系统设计 毕业设计说明书

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1、太原科技大学本科生毕业设计（说明书）液压挖掘机液压系统设计HydraulicExcavatorHydraulicSystemofDesign学院（系）：机械工程学院专业：机械设计制造及其自动化（液压）学生姓名：学号：200812030134指导教师：评阅老师：完成日期：2012.6.8太原科技大学TaiyuanUniversityofScienceandTechnology目录I摘要······································································

2、··IAbstract···································································1绪论11.1选题意义11.2挖掘机及其液压技术概述11.3国内外研究现状21.4挖掘机发展趋势32挖掘机液压系统概述52.1挖掘机液压系统的基本组成及其基本要求52.2挖掘机液压系统的基本动作分析62.3挖掘机液压系统的基本回路分析62.3.1限压回路62.3.2缓冲回路72.3.3节流回路82.3.4行走限速回路92.3.5合流回路112.3.6闭锁回路122.3

3、.7再生回路123整机参数133.1尺寸参数的选择······················································134工作装置的设计···························································144.1动臂机构参数选择····················································144.2斗杆机构参数选择·····································

4、···············154.3铲斗机构参数选择····················································164.4挖掘范围····························································185挖掘机液压系统设计195.1挖掘机的功用和对液压系统的要求195.2挖掘机液压系统原理图205.3系统分析205.4元件的选择及其元件的设计计算·······································

5、·225.4.1泵的选择······················································225.4.2液压缸的设计及其计算··········································221斗杆液压缸的设计·············································222铲斗液压缸的设计·············································303各液压缸的参数················

6、·······························345.4.3回转马达的计算及选型·········································365.4.4行走马达的选择···············································375.4.5油箱容积计算·················································375.4.6油管尺寸计算······································

7、···········375.4.7管接头的选择·················································385.4.8阀类元件的选择···············································386热平衡验算·······························································397结论42参考文献43致谢44液压挖掘机液压系统的设计摘要单斗挖掘机是一种重要的工程机械，广泛应用于房屋建筑、筑

8、路工程、水利建设、农林开发、港口建设、国防工事等的土石方施工和矿山采掘工业中，对减轻繁重的体力劳动、保证工程质量、加快建设速度、提高劳动生产率起着十分巨大的作用。随着国家经济建设的不断发展，单斗挖掘机的需求量将逐年大幅度增长，其在国民经济建设中的作用将越来越显著。近年来，有关挖掘机液压系统方面的文献并不少见，但文献的