QY20B起重机液压系统及回转机构结构设计

哈尔滨理工大学学士学位论文-I-QY20B起重机液压系统及回转机构结构设计摘要本设计论文主要介绍了当前课题的背景和课题的研究意义,论述了国内外轮式起重机发展概况和发展趋势,并对QY20B起重机的液压系统和回转机构进行了设计、计算，其中包括液压系统的设计方案的对比、分析，回转机构结构设计方案的选择，而且对重要零部件进行了设计校核。回转机构的结构设计是从回转机构的回转速度入手，确定所选结构的传动比，并对内部的马达、联轴节进行选择。并且对齿轮、蜗轮蜗杆进行了设计、计算。最后，对回转机构的主要零部件进行了校核，最终实现回转机构所要求的回转速度。关键词汽车起重机；液压系统；回转机构；回转支撑装置；液压马达哈尔滨理工大学学士学位论文-II-DesignandtheComputationtoHydraulicSystemandtheRotationOrganizationofTheQY20BAbstractThisdesignpapermainlyintroducedthecurrentbackgroundandthesignificanceofstudy,whichelaboratedthetendencyanddevelopmentofautohoistindomesticandforeigncountry.AndithascarriedonthedesignandthecomputationtohydraulicsystemandtherotationorganizationoftheQY20Bautohoist,includingthecontrastofhydraulicsystemdesignprogram,andthechoiceoftherotationorganizationstructural.Moreoveritalsomadesomekindsoftheexaminationontheimportantspareparts.Thedesignoftherotationorganizationstructuralbeginswiththespeedoftherotationorganization,determinsthevelocityratio,andchoosestheinternalmotor.Anditalsocapulatatstheshaftcouplingandthegear.Finally,italsocarriesontheexaminationofthemainspareparts,finallytherotationspeedwhichtherotationorganizationrequestsisrealized.KeywordsTruckCrane;HydraulicSystem;RotationOrganization;RotatingBlocking;HydraulicMotors哈尔滨理工大学学士学位论文-III-目录摘要......................................................................................................................IAbstract...............................................................................................................II第1章绪论........................................................................................................11.1课题背景和研究意义...............................................................................11.2国内外轮式起重机发展概况和发展趋势...............................................11.2.1国内轮式起重机发展现状................................................................11.2.2国外轮式起重机发展过程及主要机种............................................31.2.3轮式起重机产品的发展趋势............................................................41.3主要工作...................................................................................................5第2章起重机技术参数的确定........................................................................62.1主要性能参数...........................................................................................62.2QY20B型汽车起重机参数确定..............................................................72.3起重机主要结构特点...............................................................................82.4本章小结...................................................................................................9第3章液压系统原理设计..............................................................................103.1液压系统型式.........................................................................................103.1.1开式、闭式系统..............................................................................103.1.2单泵、多泵系统..............................................................................103.2液压系统的控制.....................................................................................123.2.1定量节流控制系统..........................................................................123.2.2变量系统..........................................................................................123.3QY20B汽车起重机液压系统各油路设计及整体设计........................133.3.1支腿回路..........................................................................................133.3.2回转机构..........................................................................................153.3.3伸缩回路..........................................................................................153.3.4变幅回路..........................................................................................153.3.5起升回路..........................................................................................153.3.6系统改进..........................................................................................163.4本章小结.................................................................................................16第4章回转支撑装置的设计..........................................................................174.1工况及载荷.............................................................................................174.2回转支撑的选型.....................................................................................184.3回转机构的设计.....................................................................................18哈尔滨理工大学学士学位论文-IV-4.3.1回转机构回转阻力矩的确定..........................................................194.3.2回转机构功率计算..........................................................................204.3.3回转机构参数验算..........................................................................214.4本章小结.................................................................................................22第5章关键零部件设计计算..........................................................................235.1齿轮的设计计算.....................................................................................235.2蜗轮蜗杆的设计计算.................................................