QY20B汽车起重机卷筒机构及其液压系统设计.doc

本科学生毕业设计 QY20B汽车起重机卷筒机构及其液压系统设计 系部名称： 机电工程系 专业班级：机械设计制造及其自动化08-3班 学生姓名： 指导教师： 职 称： 二○一二年六月 The Graduation Design for Bachelors Degree The Design of QY20B Truck Crane’s Creel Mechanism and Hydrahlic System. Candidate： Specialty：The?Design?Of?Mechanical?Manufacture? ?and Automation Class： Supervisor： 2012-06  摘 要 近两年，我国的起重机发展迅速，在各个领域的应用也日趋广泛，但与世界先进水平还有一定的差距，主要原因是国内配套零部件落后，材质差，再有就是制造工艺水平低。 本文对QY20B汽车起重机的设计做了研究，就汽车起重机整车做了大概的分析和论述，就汽车起重机卷筒机构进行了设计，对于中、小型汽车起重机的发展具有一定的积极意义 QY20B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。 关键字: 汽车起重机；卷筒机构；汽车起重机；液压系统；性能参数。 ABSTRACT In the recent two years, our country hoist crane development rapid, in each domain application also day by day widespread, but also has the certain disparity with the world advanced level, the main reason is the domestic necessary spare part backward, material quality bad, again has is makes the technological level to be low. This article has done the research to the QY20B autohoist design, the autohoist entire vehicle has made the general analysis and the elaboration, the autohoist rotation organization has carried on the design, , regarding the center, the small autohoist development had the certain positive sense. Model QY20B 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 an