郑州华信学院毕业论文
郑州华信学院机电系机电一体化专业毕业论文
挖掘机液压系统设计
学生姓名：兰少雅 学 号：0802010142 专 业：机电一体化 指导老师：王丽娟 完成时间：2011年3月28日
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郑州华信学院毕业论文
摘 要
液压挖掘机是工程机械的一个重要品种，是一种广泛用于建筑、铁路、公路、水利、采矿等建设工程的土方机械。液压挖掘机利用液压元件（液压泵、液压马达、液压缸等）带动各种构件动作，具有许多优点，于是它对液压系统的设计提出了很高的要求，其液压系统也是工程机械液压系统中最为复杂的。因此，对挖掘机液压系统的分析设计对推动我国挖掘机发展具有十分重要的意义。
在搜集了国内外挖掘机液压系统相关资料的基础上，了解了挖掘机液压系统的发展历史，并对挖掘机液压系统的技术发展动态进行了分析总结。本次毕业设计课题是液压挖掘机。挖掘机由多个系统组成，包括液压系统，传动系统，操纵系统，工作装臵，底架，转台，油箱，发动机安装等。本人的设计主要致力于分析和设计中型液压挖掘机液压系统的液压元件。以液压元件和液压回路为主。
关键词：挖掘机 液压系统 液压泵
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郑州华信学院毕业论文
Abstract
Construction machinery hydraulic excavator is an important species, is a widely used in construction, railway, highway, water conservancy, mining and other construction projects of Earthmoving Machinery. The use of hydraulic excavator hydraulic components (hydraulic pumps, hydraulic motors, hydraulic cylinders, etc.) bring a variety of component movement, has many advantages, so it is the design of the hydraulic system of the high demands, and its hydraulic system engineering machinery hydraulic system is the most complex. Therefore, the analysis of excavator hydraulic system design in promoting the
development of China's excavator of great significance.
At home and abroad in gathering relevant information excavator hydraulic system on the basis of the understanding of the excavators of the historical development of the hydraulic system, hydraulic excavators and technical developments have been analyzed and summarized. The graduation project is the subject of hydraulic excavators YW160. Mini-excavator from multiple systems, including hydraulic system, transmission system, control system, the working devices, chassis, turntable, fuel tanks, engine installation. I focused on the design of the analysis and design of medium-sized hydraulic excavator hydraulic system hydraulic components. Hydraulic components and the main hydraulic circuit.
Keywords: hydraulic pump hydraulic system of excavator
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目 录
１ 概 论 ............................... 2
1.1 挖掘机的简介 .................................................................................... 2 1.3 设计的内容和设计内容的意义 ........................................................... 3 1.4 设计内容的安排 ................................................................................ 4
2 液压元件的选择 ........................... 5
2.1 液压缸的选择 .................................................................................... 5 2.2 液压泵的选择 .................................................................................... 5 2.3 液压马达的选择 ................................................................................. 5 2.4 发动机的选择 .................................................................................... 5
3 液压系统回路的设计 ....................... 6
3.1 液压缸控制回路 ................................................................................. 6 3.2 液压马达控制回路 ............................................................................. 7 3.3 计算系统所需的最大流量 .................................................................. 8 3.4 压力损失的计算 ................................................................................. 8 3.5 拟定液压源控制回路 ......................................................................... 9
4 液压系统性能验算 ........................ 10
4.1 液压系统功率损失 ........................................................................... 10 4.2 液压油油温过高的原因及预防措施 ................................................. 11
5 结论和展望 .............................. 13
5.1 结论 ................................................................................................. 13 5.2 展望 ................................................................................................. 14
致 谢 ..................................... 15 参考文献 ..................................... 16
