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1、压铸机故障分析CommontroublesandeliminationmethodsofdiecastingmachineWhenthediecastingmachinefailstoworkinthecourseofitswork,theoperatorshouldpayhighattentiontoit,andobserveitcalmly,judgethelocationofthefauItandthepossiblecause,anddetermineafeasiblemethodofmaintenanc
2、e・Theoperatormustberemindedthattheworkprocedureshouldbeworkedout,andnoviolationshallbetakensoastoavoidfurtheraccidents.Todealwiththemachinefailure,boththecoldchamberdiecastingmachineandthehotchamberdiecastingmachinecanbecarriedoutaccordingtothefollowingproced
3、ures:1)judgethesymptomsandlocationofthefaultbylooking,listening,andtesting・2)analyzethepossiblecausesofthefailure・3)lookuptheequipmentoperationrecordandtroublefile・4)determinethecorrespondingprocessingmethodsandworkingprocedures・5)hands~onmaintenance.I.theoil
4、pumpcannotstartInspectionandanalysis:pressthestartingbuttonoftheoilpumptoobservewhetherthemotorrelayispulledornot・1,iftherelaydoesnotattract,thencheck1)whetherthemotorthermalrelayisoperatedordamaged・2)thepowersupplycircuitisnormal(checkwithamultimeter)・3)whet
5、herthecontactofthestartingandstoppingbuttonisnormalandwhetherthecontrollineisbrokenornot・4)whethertherelaycoilisdamaged(checkwithamultimeter)・2,ifthepumpstarts,therelayisattracted,thencheck1)whethertheoilpumpisdamagedorjammed・2)isthelineoftherelaytothemotorno
6、rmal?・3)isthepumpdamagedorassembledtootight?・Handpullshaftcouplingshouldbeeasy,axialmovementofthecouplingshouldbeabout3~5mmclearancefortheappropriate・Two.PressthestartingbuttonoftheoilpumpandheattherelaytotripCheckandanalyze:pressthestartingbuttonoftheoilpump
7、,andthehotrelayistripped.Thisisrelatedtothecurrent,theloadandthesymmetryofthethreephaseresistance・1)themotorthermalrelayisdamagedorthesettingcurrentistoosmal1.2)thevoltageistoolowtocausethecurrenttoincreaseorthethree-phasevoltageisunbalanced・1)themotorthree-p
8、hasewindingresistanceisunbalanced・2)thetotalpressureordoublepumppressureistoohigh,resultinginoverloadoperationofthemachineandtripping・3)oilpumpdamageorassemblytootight,sothatMaDachaoloado
