ze330履带式反铲液压挖掘机液压系统设计.docVIP

摘 要 本次设计的液压系统是为履带式全液压单斗挖掘机所配套，它是双泵变量系统，采用多路换向阀的并联油路、专用手动换向阀的合流方式。 设计的液压系统将泵、马达、液压缸和各种阀有机的组合在一起，以最大化的满足整机的性能，从根本上解决了现行液压系统存在的主要缺点。 本篇论文主要的研究点有以下两点: (1)为了避免系统超过最大压力，在多路换向阀的进油路上安装有安全阀，在其他分支油路安有过载阀，避免工作装置收到冲击;为了防止油液的倒流使得液压执行原件受到冲击造成损害进而会对泵造成危害，在油路中设有单向阀。 (2)为了能使液压系统的功率与发动机的功率得到充分利用，不论是液压系统与工作装置的动力匹配还是行走或回转与液压系统的匹配，只要能提高传动率，通过各种方式使机械多做有效功，就可以使液压系统的有效利用率得到大幅度提高。 关键词:液压挖掘机;液压系统;设计 Hydraulic System Design of Crawler Hydraulic Excavator EX330 Abstract In this article a small crawler-type hydraulic excavator with a bucket of which is double-pump quantitative system.It works in the confluence form ofmerging multiple directional control valve parallel oil-way and the special hand-operateddirection valvea. The topics of this paper is chosen to overcome the above-mentioned shortcomings inthe hydraulic system used at present, and the optimal design is developed for this object. This paper mainly concludes two innovator as follows: (1)In order to avoid the system exceed the maximum pressure，in the oil safety valvewas installed in the multi-way valve ,other branch circuit overload safety valve, to avoiddevice to receives the shock; in order to prevent hydraulic oil in the back while theimplementation of the original Damage caused by the impact of the pump will causeharm and then, in a one-way valve in the oil. (2)In order to fully and effective use of engine power, through various channels so that the machinery more efficient power,including power device with hydraulic system optimal matching, increase of transmission efficiency, swing mechanism of recycling, efficient power hydraulic system research and so on. Key words: Hydraulic excavator; Hydraulic System; Design 目 录 摘 要 I Abstract II 第一章 绪论 - 1 - 1.1 液压挖掘机概述 - 1 - 1.1.1 液压挖掘机概述 - 1 - 1.1.2 液压系统研究的必要性 - 1 - 1.2 液压挖掘机液压技术研究的发展现状 - 2 - 1.2.1 国内挖掘机液压系统研究现状 - 2 - 1.2.2 国外挖掘机液压系统研究现状 - 3 - 1.3 液压挖掘机的发展前景 - 5 - 第二章 液压系统概述与回路分析 - 6 - 2.1 液压系统概述 - 6 - 2.1.1 液压挖掘机的结构 - 6 - 2.1.2 挖掘