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qy20 汽车起重机 液压 系统 油箱 设计 全套 cad 图纸

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1摘 要汽车起重机式工程机械产品中重要组成部分，它由于机动性好而被广泛应用于矿山、建筑、港口、油田等领域。主要由变幅机构、伸缩机构、起升机构、回转机构、支腿机构组成。本文讲述了 QY-20 汽车起重机液压系统的设计。首先，通过对汽车起重机总体构成及工作原理进行分析，在此分析基础上提出了提液压系统各功能回路的设计方案，并把各回路组合后得出了液压系统原理图；接着，设计并选择了液压系统各液压元件并进行了相应计算；然后，对主要执行机构-液压缸进行了设计与强度校核；最后，通过 AutoCAD 制图软件绘制了本 QY-20 汽车起重机液压系统原理图的非标零件装配图及主要零件图。通过本次设计，巩固了大学所学专业知识，如：液压与气动传动、机械原理、机械设计、材料力学、公差与互换性理论、机械制图等；掌握了起重机械产品的设计方法并能够熟练使用 AutoCAD 制图软件，对今后的工作于生活具有极大意义。关键字：起重机，起升，支腿，变幅，回转2AbstractAs an important part of automobile crane engineering machinery products, it is widely used in mining, construction, port, oil field and other fields because of its good maneuverability. Mainly consists of variable amplitude mechanism, telescopic mechanism, lifting mechanism, rotating mechanism and supporting leg mechanism.This paper describes the design of hydraulic system of QY-20 truck crane. First of all, based on truck crane overall composition and working principle analysis, this analysis based on the proposed design scheme of hydraulic system and the function of the loop and to each circuit combination obtains the principle diagram of hydraulic system; then, design and selection of hydraulic system and the hydraulic pressure component and the corresponding calculation; then, on the main actuator hydraulic cylinders were design and strength check. Finally, through the AutoCAD drawing software drawn the QY-20 truck crane hydraulic system principle diagram of non-standard parts assembly drawing and main parts figure.Through the design, the consolidation of the University of the professional knowledge, such as: hydraulic and gas dynamic transmission, mechanical principles, mechanical design, mechanics of materials, tolerance and interchangeability theories, mechanical drawing; master the design method of hoisting machinery products and be able to skillfully use AutoCAD drawing software, for future work in life is of great significance.Key words: Crane, Lifting, Supporting legs, Amplitude, Rotation3目 录摘 要 .IAbstract.II第 1 章 绪论.11.1 研究背景及意义.11.2 国内外汽车起重机发展现状.11.2.1 国内发展现状.11.2.2 国外发展现状.21.3 汽车起重机的类型.21.4 汽车起重机对液压系统的要求.31.5 主要内容.3第 2 章 总体分析.52.1 设计要求.52.1.1 功能要求.52.1.2 主要技术参数要求.52.2 结构及功能分析.52.3 工况分析.72.3.1 运动分析.72.3.2 动力分析.82.3.3 负载分析.9第 3 章 液压系统设计.103.1 额定压力的确定.103.2 基本回路设计.103.2.1 支腿机构回路的设计.103.2.2 起升机构回路的设计.113.2.3 变幅机构回路的设计.113.2.4 伸缩机构回路的设计.123.2.5 回转机构回路的设计.123.3 液压系统原理图.13第 4 章 液压元件的设计与选择.144.1 液压马达和液压泵的选择.1444.1.1 卷扬马达的选择.144.1.2 回转马达的选择.144.1.3 泵的选择.154.2 液压阀的选择.164.3 液压辅助元件选择.174.3.1 液压油的选择.174.3.2 滤油器的选择.174.3.3 压力表的选择.174.3.4 阀类元件的选择.174.4 液压油箱的设计.184.5 液压油管设计.194.5.1 油管通径的计算.194.5.2 壁厚的计算.204.6 液压系统的验算.214.6.1 压