毕业设计毕业论文QY40型液压起重机液压系统设计计算说明书2.doc

摘 要 QY40型汽车起重机液压系统的设计是该型起重机设计过程中最关键的一步。本文根据液压系统的技术指标对该系统进行整体方案设计，对其功能和工作原理进行分析，初步确定了系统各回路的基本结构及主要元件，按照所给机构性能参数和液压性能参数进行元件的选择计算，通过对系统性能的验算和发热校核，以满足该起重机所要达到的要求。 本文还针对当前汽车起重机所采用的一项先进技术——电液比例控制技术，从原理、控制部件、回路控制、控制措施以及对汽车起重机的影响等进行专题研究。由此对电液比例控制技术在汽车起重机中的运用给以充分的肯定，对汽车起重机的发展前景有了很大的希望。 关键字: 汽车起重机 液压系统 高效节能 性能参数 电液比例 Abstract Model QY40 automobile crane hydraulic pressure systematic design this type hoist the most key one of the design process.This text analyses , demand to carry on the scheme to work out on this performance systematic in hydraulic pressure. Prove to its function and operation principle Have confirmed the basic structure of system every return circuit and main component tentatively According to giving the organization performance parameters and choice of carrying on the component of performance parameter of hydraulic pressure to calculate Through to the checking computations and generating heat to check of systematic function, in order to respond to the request that this hoist should reach This text, still to an advanced technology that the automobile crane adopts at present —Control technology of proportion of the electric liquid .Carry on the case study from principle , controlling part , return circuit controlling , control measure and impact on automobile crane ,etc. Therefore give the abundant affirmation to the application of the proportion of the electric liquid in the automobile crane of control technology The development prospect has very great hopes. key words:Crane truck Hydraulic pressure system Energy-efficient Performance parameter Proportion of the electric liquid 目录 TOC \o \h \z HYPERLINK \l _Toc106341142 摘要 PAGEREF _Toc106341142 \h I HYPERLINK \l _Toc106341143 Abstract PAGEREF _Toc106341143 \h II HYPERLINK \l _Toc106341144 第1章 概述 PAGEREF _Toc106341144 \h １ HYPERLINK \l _Toc106341145 1.1 关于汽车起重机 PAGEREF _Toc106341145 \h １ HYPERLINK \l _Toc106341146 1.2 液压传动应用于汽车起重机上的优缺点 PAGEREF _Toc106341146 \h １