西安建筑科技大学硕士论文FailureanalysisandimprovementresearchofchaingratepartsAbstractSincetheproductionprocessofchaingratemachine-rotarykilnpelletswassuccessfullyputintouseinShougangQianin2000,thistechnologyhasbeengreatlydevelopedinourcountry.Butinpractice,chaingratepartsareeasilytofailbecauseofimproperselectionofmaterialsanddesigndeficiency,whichresultstogreateconomiclossforthecompany.InXinyuSteel,theblastfurnacepelletsratiohasreached15%.Buttheproductionquantityofpelletsisonly70000~90000tonsforonemonth,whichisfarfromthedesigncapacity.And2()Ooo~3(XXX)tonsofpelletsareneededtobuyfromothercompanyeverymonth,whichleadstoeconomicburdensincethehigherprice.Inordertoincreaseself-producedpelletsproductionandeconomicefficiency,itisnecessarilytoreducethefaultrate.InXinyuSteel,oxygenationlossofgratebedparts,deformationandfracturearethemainreasonforfailureforthepartsofchaingratemachine.Inthepresentstudy,visualinspection,mechanicaltesting,chemicalelementanalysis,metallographicanalysis,linearexpansioncalculationwereusedtoexploretheftιiluremechanismindetail.Theantioxidantregularityofheatresistantsleektheinfluenceofvariouselementsonthemicrostructureandmechanicalpropertiesofheatresistantsteelconstituent,andthematerialweldingperformancewereexamined.Basedontheanalysis,improvementexperimentswerecarriedout.Themainconclusionsareasfollows:(1)TheworkingIeiTiperatureishigherthan600℃andtheshearstresscanbehigherthan135.67MPaforthesmallshaftwhenitisused.Inthiscondition,20CrMoiseasytocreepandfracture.Andthe2Crl3withadditionof3%Niand4%Mncanimprovethemicrostructurestabilityathightemperature,whichsatisfiestheperformancerequirementofsmallshaftparts.(2)Theoldgrateplatestructurewasthin,andZG30Cr26Ni5exhibitedpoorabrasion6西安建筑科技大学硕士论文resistanceandoxidationresistanceathightemperature,whicheasilyleadstofailure.WhileZG35Cr24Ni7SiNcanworkat11()()°Candshowsbettermechanicalpropertiesandoxidationresistance,soitissuitabletomakegrateplateandsidepanelparts.(3)Thereasonforoxidationburningofsidepanelmainlyliesintheunevendistributionofpelletsandtheimproperoperation.Thefracturefailureoflinksisduetothedisplacementbecauseofthelooseofpartsathightemperature.!Crl8Ni9Tiausteniticstainlesssteelwasusedasslippingplateandtheswingscaleofthebeltmachinewasadjustedtoproperlevel,andsoabetterdistributionofpelletscanbeachieved.Locknutswereequippedonbothsidesofthemainshaft,andchainloosewasprevented.(4)Theadditionofmandatoryautomaticresetdeviceintheendofthechaingratemachinecanforcegrateplatereturnandavoidemptyofgratebed,itisalsocanplayagoodprotectiveeffectforthegratebed.Keywords:chaingratemachine;heatresistantsteel;failureanalysis;improvementexperiment西安建筑科技大学硕士论文目录1绪论.............................................................................11.2链篦机一回转窑球团生产的发展与工艺特点....................................21.2.1链篦机一回转窑球团生产发展简史.....................................22.2.2链篦机一回转窑球团法生产工艺特点..................................3L3链篦机及篦床设备结构特点....................................................4L3.1链篦机..............................................................41.3.2篦床..............................................................51.4链篦机篦床生产应用现状与耐热钢的发展应用..................................61.4.1链篦机篦床生产应用现状.........................
