外文翻译--输送带技术的最新发展.doc

附录英文原文LatestDevelopmentsinBeltConveyorTechnologyM.A.AlspaughOverlandConveyorCo.,Inc.PresentedatMINExpo2004LasVegas,NV,USASeptember27,2004AbstractBulkmaterialtransportationrequirementshavecontinuedtopressthebeltconveyorindustrytocarryhighertonnagesoverlongerdistancesandmorediverseroutes.Inorderkeepup,significanttechnologyadvanceshavebeenrequiredinthefieldofsystemdesign,analysisandnumericalsimulation.Examplesofcomplexconveyingapplicationsalongwiththenumericaltoolsrequiredtoinsurereliabilityandavailabilitywillbereviewed.IntroductionAlthoughthetitleofthispresentationindicates“new”developmentsinbeltconveyortechnologywillbepresented,mostoftheideasandmethodsofferedherehavebeenaroundforsometime.Wedoubtanysinglepieceofequipmentorideapresentedwillbe“new”tomanyofyou.Whatis“new”arethesignificantandcomplexsystemsbeingbuiltwithmostlymaturecomponents，whatisalso“new”istheincreasingabilitytoproduceaccuratecomputersimulationsofsystemperformancepriortothefirstsystemtest(commissioning).Assuch,themainfocusofthispresentationwillbethelatestdevelopmentsincomplexsystemdesignessentialtoproperlyengineerandoptimizetodayslongdistanceconveyancerequirements.Thefourspecifictopicscoveredwillbe:EnergyEfficiencyRouteOptimizationDistributedPowerAnalysisandSimulationEnergyEfficiencyMinimizingoverallpowerconsumptionisacriticalaspectofanyprojectandbeltconveyorsarenodifferent.Althoughbeltconveyorshavealwaysbeenanefficientmeansoftransportinglargetonnagesascomparedtoothertransportmethods,therearestillvariousmethodstoreducepowerrequirementsonoverlandconveyors.Themainresistancesofabeltconveyoraremadeupof:IdlerResistanceRubberindentationduetoidlersupportMaterial/BeltflexureduetosagbeingidlersAlignmentTheseresistancesplusmiscellaneoussecondaryresistancesandforcestoovercomegravity(lift)makeuptherequiredpowertomovethematerial.Inatypicalin-plantconveyorof400mlength,powermightbebrokenintoitscomponentsasperFigure1withliftmakingupthelargestsinglecomponentbutallfrictionforcesmakingupthemajority.Inahighinclineconveyorsuchasanundergroundmineslopebelt,powermightbebrokendownasperFigure2,withliftcontributingahugemajority.Sincethereisnowaytoreducegravityforces,therearenomeanstosignificantlyreducepoweronhighinclinebelts.Butinalongoverlandconveyor,powercomponentswilllookmuchmorelikeFigure3,withfrictionalcomponentsmakingupalmostallthepower.Inthiscase,attentiontothemainresistancesisessential.Thespecificsofpowercalculationisbeyondthescopeofthispaperbutitisimportanttonotethatsignificantresearchhasbeendoneonallfourareasofidlers,rubberindentation,alignmentandmaterial/beltflexureoverthelastfewyears.Andalthoughnoteveryoneisinagreementastohowtohandleeachspecificarea,itisgenerallywellacceptedthatattentiontothesemainresistancesisnecessaryandimportanttooverallprojecteconomics.Atthe2004SMEannualmeeting,WalterKungofMANTakrafpresentedapapertitled“TheHendersonCoarseOreConveyingSystem-AReviewofCommissioning,Start-upandOperation”2.ThisprojectwascommissionedinDecember1999andconsistedofa24km(3flight)overlandconveyingsystemtoreplacetheundergroundminetomillrailhaulagesystem.Thelongestconveyorinthissystem(PC2)was16.28kminlengthwith475moflift.Themostimportantsystemfactwasthat50%oftheoperatingpower(4000kWat1783mt/hand4.6m/s)wasrequiredtoturnanemptybeltthereforepowerefficiencywascritical.Verycloseattentionwasfocusedontheidlers,beltcoverrubberandalignment.OnewaytodocumentrelativedifferencesinefficiencyistousetheDIN22101standarddefinitionof“equivalentfrictionfactor-f”asawaytocomparethetotalofthemainresistances.Inthepast,atypicalDINfusedfordesignofaconveyorlikethismightbearound0.016.MANTakrafwasestimatingtheirattentiontopowerwouldallowthemtorealizeanfof0.011,ared