安徽交通职业技术学院毕业论文题目：挖掘机常见故障检测与维修学生姓名：梁振环学号：200921770毕业学校：安徽交通职业技术学院班级：09机械班院（系）：汽车与机械工程系专业：工程机械运用与维护入学时间：2009年9月导师姓名：吴幼松职称：副教授完成时间：2012年6月摘要近年来随着我国建设事业的高速发展，挖掘机已成为重要的土方工程机械被广泛应用于工程中。现代挖掘机一般都采用了机电液一体化控制模式,常见故障为挖掘机行走跑偏、发动机转速下降,工作速度变慢,挖掘无力、制动不灵/等一些日常使用中的故障。本文主要介绍了挖掘机的液压系统、回转系统、行走系统、电气系统、发动机、传动系统的常见故障判断及维修方向。1Abstract;Inrecentyears,withtherapiddevelopmentofourcountryconstructioncareer,excavatorhasbecomeimportantearth-movingmachineryiswidelyusedinengineering.Modernexcavatorgenerallyadoptedelectromechanicalelectrohydrauliccontrolmode,commonfaultforexcavatorwalksnaking,enginespeedslowdecline,work,miningweakness,brakedailyusesome,suchasineffective/thefault.Thispapermainlyintroducesthehydraulicsystem,turninganexcavatorsystem,motionsystem,electricalsystem,engine,transmissionsystemofthecommonfaultdiagnosisandmaintenancedirection.目录1引言...............................................................................................................................................42.液压系统常见故障.......................................................................................................................42.1挖掘机液压系统........................................................................................................................42.2单个动作故障............................................................................................................................42.2.1挖掘机操作动作缓慢无力或完全没有动作。......................................................................42.2.2挖掘机操作动作错乱。..........................................................................................................42.3某组操纵阀控制的几个动作同时不正常...............................................................................522.3.1此种故障原因可能是子系统主溢流阀故障。......................................................................52.3.2故障原因还有可能是所在子系统液压泵故障。..................................................................52.3.3故障子系统液压泵调节机构也可能发生故障。................................................................52.4整机全部动作故障..................................................................................................................52.5挖掘机液压系统故障检测方法................................................................................................53回转系统.......................................................................................................................................63.1液压挖掘机不能回转及回转角度偏大原因.............................................................................63.2惯性回转角度偏大....................................................................................................................64行走系统......................................................................................................................................74.1行走跑偏....................................................................................................................................75电气系统...
