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1、(16MPa),thentheoverflowvalveisopened,theunloadingsystem,soastoensurethesafeoperationofthesystem.PY160平地机前桥倾斜拉杆断裂失效的分析及改进AnalysisandimprovementoffracturefailureofinclinedtiebaroffrontaxleofPY160grader11-25TiltmechanismoffrontaxleTotiltinspecialconditionsoffrontaxle,hydrauliccircuitcanhandleoper
2、ationonthetiltofthehydrauliccylinder,thepistonrodofthehydrauliccylinderandthetiltrodtelescopicandtherebytorealizesynchronoustilttotheleftorrightofthefrontaxlethroughaconnectingpinshaft,themaximumtiltangledependsmoinlyontheretainingblockisarrangedontheleftandrightsidesofthebridgeguarantee.Whent
3、hesteeringknucklebearingduetoinclinetothecollisionblock,whenthepressurethentiltthehydrauliccylinderpressure,thesystemsettingvalueincreasestothereliefvalveinInspectionandanalysisofthefractureofinclinedtierodDuringtheassemblyandcommissioningofthewholemachine,thefractureoftheinclinedtierodoccurre
4、dmanytimesduringthetestofthemaximumtiltangleofthefrontaxle・ThefracturepositionistheweldseamshowninfigureI,andthefrontwheelistiltedtotheright,i.e.,whenthepistonrodofthehydrauliccylinderisstretchedout・Butthepressuregaugeshowsthatthesystempressureiswithinthenormalworkingrange,sothepossibilityofhy
5、draulicsystemfailureiseliminated.Thefollowingproblemswerefoundintheinspection:(L)thephenomenonofmeatbiteseldomoccursattheseamfracture,mainlybecausetheweldingqualityoftheweldisnothigh・Duetotheuseofmanualarcwelding,weldingseamheightisinconsistent,highandlowvaluesvarygreatly.Atthesametime,thegroo
6、veattheendofthecasingisverysmall,sothattheweldisonlyattachedtotheouterwallofthecasingandthesurfaceofthepullrodseat,resultinginagreatreductionintheloadcarryingcapacityoftheweld・(2)tubeandrodseat(ZuoDuan)pinclearance,andtheclearanceistoolarge(about1.5mm),sothatthelossofthecenteringfunction,itisd
7、ifficulttoguaranteethetiltrodweldingassemblyatbothendsofthecoaxialrodseat,andalsobecauseofstress"strength"andacceleratedfracture・(3)thereareobviousextrusionmarksatthejointoftheleftsteeringknucklesupportandtheblock,whichshowsthatthe"over
