QY40型汽车起重机液压系统的设计42000字2

QY-40型汽车起重机液压系统设计摘要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AbstractModelQY40automobilecranehydraulicpressuresystematicdesignthistypehoistthemostkeyoneofthedesignprocess.Thistextanalyses,demandtocarryontheschemetoworkoutonthisperformancesystematicinhydraulicpressure.ProvetoitsfunctionandoperationprincipleHaveconfirmedthebasicstructureofsystemeveryreturncircuitandmaincomponenttentativelyAccordingtogivingtheorganizationperformanceparametersandchoiceofcarryingonthecomponentofperformanceparameterofhydraulicpressuretocalculateThroughtothecheckingcomputationsandgeneratingheattocheckofsystematicfunction,inordertorespondtotherequestthatthishoistshouldreachThistext,stilltoanadvancedtechnologythattheautomobilecraneadoptsatpresent—Controltechnologyofproportionoftheelectricliquid.Carryonthecasestudyfromprinciple,controllingpart,returncircuitcontrolling,controlmeasureandimpactonautomobilecrane,etc.ThereforegivetheabundantaffirmationtotheapplicationoftheproportionoftheelectricliquidintheautomobilecraneofcontroltechnologyThedevelopmentprospecthasverygreathopes.keywords:Cranetruck,Hydraulicpressuresystem,Energy-efficient,Performanceparameter,Proportionoftheelectricliquid目录1绪论..............................................................71.1关于汽车起重机.................................................71.2液压传动应用于汽车起重机上的优缺点.............................71.2.1优点.......................................................71.2.2缺点.......................................................81.3液压系统的类型.................................................81.4汽车起重机液压系统功能、组成和工作特点........................81.5汽车起重机液压系统的运用现状和发展趋势........................111.6本课题来源、任务要求和整机性能参数...........................131.7本课题主要研究工作............................................152液压系统元件选择.................................................162.1典型工况分析及对系统要求......................................162.1.1伸缩机构的作业情况........................................162.1.2副臂的作业情况............................................162.1.3三个以上机构的组合作业情况................................162.1.4典型工况的确定............................................162.1.5系统要求..................................................172.2液压系统类型选择..............................................192.2.1本机液压系统分析..........................................192.2.2各机构动力组合、分配及控制................................202.3各种执行元件的选择............................................223各液压回路组成原理和性能分析.....................................233.1主副卷扬回路..................................................233.1.1性能要求..................................................243.1.2主要元件..................................................243.1.3主要回路..................................................243.1.4功能实现和工作原理........................................243.2回转回路......................................................273.2.1性能要求..................................................283.2.2主要元件..................................................283.2.3主要回路..................................................283.2.4功能实现和工作原理........................................283.3伸缩回路......................................................293.3.1性能要求..................................................303.3.2主要元件..................................................303.3.3主要回路..................................................303.3.4功能实现和工作原理........................................303.4变幅回路......................................................323.4.1性能要求..................................................323.4.2主要元件..................................................323.4.3主要回路..................................................323.4.4功能实现和工作原理........................................323.5支腿回路......................................................333.5.1性能要求..................................................333.5.2主要元件..................................................333.5.3主要回路..................................................333.5.4功能实现和工作原理........................................344液压系统设计计算.................................................354.1液压系统工作参数和各机构主要参数..............................354.1.1工作机构主要参数..........................................354.1.2液压系统参数..............................................374.2液压元件选择计算..............................................384.2.1液压马达和液压泵的选择计算................................384.2.2液压阀的选择..............................................494.2.3液压辅助元件选择..........................................535系统各回路性能计算...............................................575.1系统各回路功率计算............................................575.1.1各回路功率选取............................................575.1.2管路系统容积效率及压力效率计算............................575.2系统各回路性能的验算..........................................595.2.1起升回路..................................................595.2.2回转回路.......