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1、听诊法诊断压路机异响故障Auscultationreferstohearingthroughtheeartodeterminewhethertheworkisnormalineachpartofthemachine.Generallytherearetwokindsofmethods:reallisteningandvirtuallistening.Reallisteningreferstotheuseofscrewdrivers,metalbarsandotherstethoscope,directlytotheplaceofabnormalsoundaus
2、cultation.Emptyhearingreferstothedistancebetweentheearandthehairandthedistancetoauscultation.Inpracticaluse,thegenerallocationoffaultsisusuallyjudgedbyvirtuallistening,andthespecificpartsofthefaultaredeterminedbyreallisteningandthecausesareanalyzed.Examplesofcommonabnormalsoundfailu
3、resincompactorsareasfollows:1,theinjectionadvanceangledoesnotmatchInjectiontimeisearly:soundcrisp,coherentrhythm,noteasytostart,lackofpower・Injectiontimethroughthesoundnotcrisp,slightlylownoise,uniformwatertemperature,oiltemperature,exhaustpipe:thetemperatureistoohigh,blacksmoke,ins
4、ufficientpower・Abnormalsoundoccurredontheupperpartofthedieselengine・Listentothestethoscopeandtouchtheinstrumentneartheinjector・Thespeedofdieselengineisincreasedsuddenlyfromidlespeedtohighspeed,andthenoiseisobviouslyenhancedandaccompaniedbylargervibration.Whenthespeedincreases,thenoi
5、sewilldecreaseafterstabilization.Ifthespeedisreduced,thenoisedisappears,andwhentheidlespeedisstable,thenoiseappearsagain.Removalmethod:adjusttheinjectionadvanceangle,checktheinjectionpump.1,thecylinderclearanceistoolargeThevoicewashoarseandhoarse・Whenthemachinetemperatureislower,the
6、noiseisobvious,andthenoisedecreasesafterthemachinetemperaturerises・Startdifficult,workfromtheoilporttohearthesoundofleakage,accompaniedbyintermittentsmoke,oiltemperaturehigher・Abnormalsoundoccursintheupperpartofthecylinderblock・Thestethoscopecantouchthestethoscopeonbothsidesofthecyl
7、inderblock.Thespeedofdieselengineischangedrapidly,thenoiseisobvious,andthenoiseismoreobviouswhenthespeedisincreased・Ifasmallamountofoilisinjectedintothecylinder,theabovephenomenoncanbeprovedtobethefault.Waysofremoving:replacepistonring,replacepiston,cylinderlinerorboringcylinderslee
8、veaccordingtowearco
