挖掘机液压系统的设计与研究

山东农业大学

毕业论文题目：挖掘机液压系统的设计与研究

院部机械电子与工程学院

专业班级

届次

学生姓名

学号

指导教师

目录

引言 (i)

1挖掘机发展的历史和现状及发展 (3)

1.1国内挖掘机发展的历史和现状 (3)

1.2 国外挖掘机发展的历史和现状及发展 (2)

2 挖掘机液压系统的基本组成及其基本要求 (2)

3 挖掘机液压系统的基本动作分析 (2)

4 挖掘机液压系统的基本回路分析 (2)

4.1限压回路 (2)

4.2缓冲回路 (3)

4.3节流回路 (2)

4.4行走限速回路 (2)

4.5合流回路 (2)

4.6闭锁回路 (2)

4.7再生回路 (2)

5 负载敏感压力补偿液压系统的设计 (2)

5.1负载敏感压力补偿液压系统控制回路设计 (2)

5.1.1降低系统溢流损失 (2)

5.1.2液压系统的最高压力限制 (2)

5.1.3防止系统压力冲击 (3)

5.1.4二次压力反馈式LS控制系统 (3)

5.1.5发动机扭矩控制 (2)

5.2负载敏感压力补偿液压系统的基本回路 (2)

5.2.1回转回路 (2)

5.2.2行走回路 (3)

5.2.3动臂、斗杆、铲斗回路 (3)

致谢词 (2)

参考文献 (2)

Contents

Introduction (i)

1 Development and present of excavator (3)

1.1 Development and present of excavator internal (3)

1.2 Development and present of excavator overseas (2)

2 The basic compose and requirment of hydraulic system of excavator 2

3 The basic motion analysis of hydraulic system of excavator (2)

4 The basic circuit analysis hydraulic system of excavator (2)

4.1Pressure limiting circuit (2)

4.2Buffer circuit (3)

4.3Cuttingloop (2)

4.4Walking speed limit of loop (2)

4.5 Combined Loop (2)

4.6 Closed loop (2)

4.7 Regeneration circuit (2)

5 The design of pressure compensated load sensing hydraulic system 2

5.1The design of load sensing hydraulic system pressure compensation

control loop (2)

5.1.1 Overflow losses reduce system (2)

5.1.2Limit the maximum pressure hydraulic system (2)

5.1.3 To prevent the system pressure shock (3)

5.1.4LS secondary pressure feedback control system (3)

5.1.5Engine torque contro (2)

5.2Pressure compensated load sensing hydraulic system of the basic

circuit (2)

5.2.1Turn loop (2)

5.2.2Walking Loop (3)

5.2.3The boom；Stick；Bucket Loop (3)

Acknowledgement (2)

References (2)

挖掘机液压系统的设计与研究

【摘要】本次设计主要是对挖掘机的液压系统进行设计和研究。介绍了国内国外的挖掘机发展和现状作了概述，并对挖掘机液压系统基本动作和基本回路做了详细的分析与介绍，其中包括限压回路、缓冲回路、节流回路、行走限速回路、合流回路、闭锁回路、再生回路。并且对负载敏感压力补偿液压系统、二次压力反馈式LS控制系统和动臂、斗杆、铲斗回路进行设计。文中对各液压回路给出了具体的结构简图以及相关研究资料。文中运用运算和图表以及数据分析、CAD制图对挖掘机液压系统进行了具体的设计和研究。

关键词：挖掘机，液压系统，回路分析

Design and Study on Hydraulic System of

Excavator

Author：SunYongteng，Supervisor：Li Rushen

（Professor of Shandong Agriculture University）Abstract The research focus on design and study on hydraulic system of excavator. It introduces the development of excavator internal and overseas, and give a general introduction to the presents of excavator. The research has a detail motion analysis and circuit analysis of hydraulic system of excavator. It includes pressure limiting circuit, buffer circuit, cutting loop, walking speed limit of loop, combined Loop, walking speed limit of loop, combined loop, closed loop, Regeneration circuit. Except that it also have a design of Pressure compensated load sensing hydraulic system, LS secondary pressure feedback control system, and the boom stick and bucket loop. The thesis has a detail design and research on hydraulic system of excavator by calculation, charm data analysis and drafting of CAD.

Key words: excavator; hydraulic system; circuit analysis