文档介绍：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，挖掘机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，工作装置，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
Abstract
Hydraulic excavator is one of important engineering machinery, is a widely used in construction, railway, highway, water conservancy, mining, etc construction projects of earthwork machinery Excavator for hydraulic system design and puts forward high demand, the hydraulic systems of engineering machinery in hydraulic system is complex Therefore, the excavator hydraulic system analysis and design for impelling our country excavator development has the extremely vital significance
In the domestic and foreign excavator hydraulic system based on the materials of, learned about the excavator hydraulic system development history, and for excavator hydraulic system technology development dynamic is summarized The graduation design task is hydraulic excavator Excavator by multiple system components, including hydraulic system, transmission system, control systems, work device, chassis, turntable, tank, engine installation, etc My design is mainly devoted to