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`中文题目：XE40小型挖掘机液压系统设计外文题目：DESIGNHYDRAULICSYSTEMOFXE40SMALLCRAWLEREXCAVATOR毕业设计（论文）共76页（其中：外文文献及译文8页）图纸共11张完成日期2015年6月答辩日期2015年6月辽宁工程技术大学本科毕业设计（论文）学生诚信承诺保证书本人郑重承诺：《》毕业设计（论文）的内容真实、可靠，系本人在指导教师的指导下，独立完成。如果存在弄虚作假、抄袭的情况，本人承担全部责任。学生签名：年月日辽宁工程技术大学本科毕业设计（论文）指导教师诚信承诺保证书本人郑重承诺：我已按学校相关规定对同学的毕业设计（论文）的选题与内容进行了指导和审核，确认由该生独立完成。如果存在弄虚作假、抄袭的情况，本人承担指导教师相关责任。指导教师签名：年月日I摘要XE40小型挖掘机是徐工生产的小型液压挖掘机，本次的毕业设计的课题就是对其进行液压系统的参数化设计。为了研究这个课题，我们的主要的思路就是要先根据已知的挖掘机的性能参数对工作速度和工作压力进行初步的确定，再根据这些数据，对铲斗缸进行参数计算。参考所选液压缸的连接方式和XE40小型挖掘机选用的液压缸的具体形状，绘制出液压缸的CAD图。依照铲斗缸的设计方式与计算流程同理也能设计出斗杆缸和动臂缸。同时根据所设计的挖掘机所选用的动臂缸的数量，就能大致确定出运作液压缸所需要的流量。通过已确定的流量，工作压力，还有工作速度，就能初步确定液压泵的型号和液压马达的型号。然后再参考徐工挖掘机XE40的液压系统，根据系统回路和对挖掘机工作方式的了解，初步设计出液压挖掘机系统的原理图，并用CAD绘制出来。经过审核之后，再来确定所要要用的液压油，发动机，以及对液压阀进行选型。关键词:液压缸;参数化设计；徐工挖掘机;液压系统`IIAbstractXE40smallexcavatorisxugongproductionofsmallhydraulicexcavator,thisgraduationdesigntopicisontheparametricdesignofhydraulicsystem.Inordertostudythesubject,ourmainideaistofirstaccordingtotheknownexcavatorworkparametersontheperformanceofspeedandpressurewasdeterminedpreliminarily,accordingtothesedata,thebucketcylinderparametercalculation.RefertotheconnectionmodefortheselectedhydrauliccylinderandhydrauliccylinderofXE40smallexcavatorselectionofspecificshape,drawtheCADdrawingofthehydrauliccylinder.Accordingtothebucketcylinderdesignmethodandcalculationofflowinthesamewayalsocandesignthebucketrodandmovablearmcylinder.Atthesametimeaccordingtothedesignofexcavatorchoosesthenumberofthemovablearmcylinder,canroughlydeterminetheoperationsrequiredforthehydrauliccylinderoftraffic.Bytheflowhavebeenidentified,workstressandworkspeed,canpreliminarilydeterminethemodelofhydraulicpumpandhydraulicmotormodel.ThenthereferencexugonghydraulicsystemofexcavatorXE40,basedonthesystemcircuitandunderstandingoftheexcavatorworkingstyle,thepreliminarydesignofthehydraulicexcavatorsystemschematicdiagram,andCADdrawing.Afterreview,andthentodeterminetheneedtousethehydraulicoil,engine,aswellastotheselectionofhydraulicvalve.Keyword:thehydrauliccylinder;parametricdesign;xugongexcavator；thehydraulicsystem目录前言...........................................................................................................................11挖掘机现状及研究准备.......................................................................................31.1国内外发展状况................................................................................................31.1.1国外发展状况.................................................................................................31.1.2国内发展状况.................................................................................................31.2本课题研究内容及意义....................................................................................42液压挖掘机的工况分析.......................................................................................62.1挖掘工况分析.....................................................................................................72.2满斗举升回转工况分析.....................................................................................82.3卸载工况分析.....................................................................................................92.4空斗返回工况分析.............................................................................................92.5整机移动工况分析.............................................................................................93液压系统及液压回路的设计.............................................................................113.1液压系统概述...................................................................................................113.2工作原理...........................................................................................................113.3基本要求...........................................................................................................113.4基本动作及系统分析.......................................................................................123.5小型液压挖掘机的基本回路..........................................................................133.5.1回转机构液压系统.......................................................................................133.5.2液压缸液压系统...........................................................................................14`3.5.3限压回路.......................................................................................................143.5.4卸荷回路.......................................................................................................153.5.5缓冲回路.......................................................................................................163.5.6节流限速回路.............................................................................................173.5.7行走限速回路........................................................................................174液压系统主要参数计算.....................................................................................194.1工作装置构成与分析......................................................................................194.2液压缸参数化设计..................................................................................