液压挖掘机液压系统设计毕业设计说明书.docx

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
Hydraulic Excavator Hydraulic System of Design
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: 简立瑞
学号: 200812030134
指导教师: 魏聪梅
评阅老师:
完成日期:

太原科技大学
Taiyuan University of Science and Technology
目录
I
摘要········································································
I
Abstract···································································
1 绪论 1
选题意义 1
挖掘机及其液压技术概述 1
国内外研究现状 2
挖掘机发展趋势 3
2 挖掘机液压系统概述 5
挖掘机液压系统的基本组成及其基本要求 5
挖掘机液压系统的基本动作分析 6
挖掘机液压系统的基本回路分析 6
限压回路 6
缓冲回路 7
节流回路 8
行走限速回路 9
合流回路 11
闭锁回路 12
再生回路 12
3 整机参数 13
尺寸参数的选择······················································13
4 工作装置的设计···························································14
动臂机构参数选择····················································14
斗杆机构参数选择····················································15
铲斗机构参数选择····················································16
挖掘范围····························································18
5 挖掘机液压系统设计 19
挖掘机的功用和对液压系统的要求 19
挖掘机液压系统原理图 20
系统分析 20
元件的选择及其元件的设计计算········································22
······················································22
··········································22
1 斗杆液压缸的设计·············································22
2 铲斗液压缸的设计·············································30
3 各液压缸的参数···············································34
回转马达的计算及选型·········································36
行走马达的选择···············································37
油箱容积计算·················································37
油管尺寸计算
·················································37
管接头的选择·················································38
阀类元件的选择···············································38
6 热平衡验算·····························································