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外文翻译--带式输送机.doc

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外文翻译--带式输送机.doc

英文原文EsignofSpeedBeltConveyorsG.Lodewijks,TheNetherlands.Thispaperdiscussesaspectsofhighspeedbeltconveyordesign.Thecapacityofabeltconveyorisdeterminedbythebeltspeedgivenabeltwidthandtroughingangle.Beltspeedselectionhoweverislimitedbypracticalconsiderations,whicharediscussedinthispaper.Thebeltspeedalsoaffectstheperformanceoftheconveyorbelt,asforexampleitsenergyconsumptionandthestabilityofitsrunningbehavior.Amethodisdiscussedtoevaluatetheenergyconsumptionofconveyorbeltsbyusingthelossfactoroftransport.Withvariationofthebeltspeedthesafetyfactorrequirementsvary,whichwillaffecttherequiredbeltstrength.Anewmethodtoaccountfortheeffectofthebeltspeedonthesafetyfactorispresented.Finally,theimpactofthebeltspeedoncomponentselectionandonthedesignoftransferstationsisdiscussed.Beltmachinebyconveyorbeltcontinuousorintermittentmotiontotransportallkindsofdifferentthings,Cantransportallkindsofbulkmaterials,butalsotransportavarietyofcardboardboxes,packagingbags,weightofsinglepiecesofsmallgoods,awiderangeofuses.Beltconveyorbeltmaterialrubber,silicone,PVC,PUandothermaterials,inadditiontoordinarymaterialconveying,butalsotomeetthetransmissionoilresistant,corrosionresistance,antistaticandotherspecialrequirementsformaterial.Beltconveyorstructuregroovebeltmachine,flatbeltconveyor,climbingbeltmachine,turningmachinesandotherformsbelt,conveyorbeltcanalsobecreatedtoenhancethetailgate,skirtsandotheraccessories,canmeetavarietyoftechnologicalrequirements.Thebeltconveyordrivedecelerationmotordrive,electricdriveroller.Beltconveyormodefrequencycontrol,steplesstransmission.Thebeltrackmaterialcarbonsteel,stainlesssteel,aluminumprofile.Scopeofapplicationlightindustry,electronics,food,chemical,wood,etc..Beltmachineequipmentcharacteristicsbeltconveyorisstable,thematerialandtheconveyorbeltthereisnorelativemotion,toavoiddamagetothecarriermaterial.Lownoise,suitableforquietworkenvironmentrequirements.Simplestructure,easymaintenance.Lowenergyconsumption,lowusecost.Conveyorisacommondonthaveflexibletractioncomponentcontinuousconveyingmachinery,alsocalledcontinuousconveyor.Itisamaterialhandlingequipment,itwithhandlingabilitystrong,persistent,direction,flexible,andotheradvantagesinindustrialproductioninlargebeingapplied.Althoughmanytypesofbeltconveyor,butitsworkingprincipleisbasicsimilar,mostaredrivingdraughtdeviceanddrivetransmissioncontainertransportmaterials.Conveyorcanundertakelevel,thetiltandverticalconveyor,alsocanmakethespacetransportroutes,transmissionlinesisusuallyfixed,isamodernproductionandlogisticstransportindispensableimportantmechanicalequipment.Ithastransmissioncapacityisstrong,longdistancetransportationetc.Withthedevelopmentofindustry,conveyoralsoobtainedfastdevelopment,conveyorproductshavebeenalsograduallyimproved.Withtheemergenceofthepowerequipmentofsimilarprincipleisapplied,conveyorcontinuingintothe19thcentury,britonsusebasketwork,wireropefortractionbeltconveyor.Theprincipleofbeltconveyor,whenappliedinthe17thcenturyalsorecordedconveyor,in1880Germancompanydevelopeddrivenbysteambeltconveyor.ThentheBritishandGermanandlaunchedinertialconveyor,iftheconveyorbelt,theapplicationoftheprinciple,creatingatiltofthebeltconveyor,belt,tractionwithchains.Allsortsofconveyorduringthistimeariseconveyor,basedonhuman,hydraulicpowerdrivesuch.Allthestructuresconveyorsuccessivelyappeared.In1887americansproducedthescrewconveyor,makeenterpriseinternal,betweenenterpriseandintercitytransportationpossible.Thedevelopmenthistoryofbeltconveyor,theyveryancientinsteadoftheoriginalmotiveforconveyorprovidedrivingforce.AncientpeoplebegantousewateroverturnedandhighTongCheconveyor,inturnafterthewaterconservancyprojectsbeltconveyorbegininpower.QuicktemperedexaltsAccordingtothemodeofoperationconveyingmachinerycanbedividedinto1beltconveyor2screwconveyor3doupatternliftmachineThefutureoflargescale,willtowardbeltusescope,energyconsumption,lowpollutionless,materialautomaticallygrading,etc.Pastresearchhasshowntheeconomicalfeasibilityofusingnarrower,fasterrunningconveyorbeltsversuswider,slowerrunningbeltsforlongoverlandbeltconveyorsystems.SeeforexampleI5.Today,conveyorbeltsrunningatspeedsaround8m/sarenoexceptions.However,velocitiesover10m/supto20m/saretechnicallydynamicallyfeasibleandmayalsobeeconomicallyfeasible.Inthispaperbeltspeedsbetweenthe10and20m/sareclassifiedashigh.Beltspeedsbelowthe10m/sareclassifiedaslow.Usinghighbeltspeedsshouldneverbeagoalinitself.Ifusinghighbeltspeedsisnoteconomicallybeneficialorifasafeandreliableoperationisnotensuredatahighbeltspeedthenalowerbeltspeedshouldbeselected.Selectionofthebeltspeedispartofthetotaldesignprocess.Theoptimumbeltconveyordesignisdeterminedbystaticorsteadystatedesignmethods.Inthesemethodsthebeltisassumedtobearigid,inelasticbody.Thisenablesquantificationofthesteadystateoperationofthebeltconveyoranddeterminationofthesizeofconveyorcomponents.Thespecificationofthesteadystateoperationincludesaquantificationofthesteadystaterunningbelttensionsandpowerconsumptionforallmaterialloadingandrelevantambientconditions.Itshouldberealizedthatfindingtheoptimumdesignisnotaonetimeeffortbutaniterativeprocess6.Designfinetuning,determinationoftheoptimumstartingandstoppingprocedures,includingdeterminationoftherequiredcontrolalgorithms,anddeterminationofthesettingsandsizesofconveyorcomponentssuchasdrives,brakesandflywheels,aredeterminedbydynamicdesignmethods.Inthesedesignmethods,alsoreferredtoasdynamicanalyses,thebeltisassumedtobeathreedimensionalviscoelasticbody.Athreedimensionalwavetheoryshouldbeusedtostudytimedependenttransmissionoflargelocalforceanddisplacementdisturbancesalongthebelt7.Inthistheorythebeltisdividedintoaseriesoffiniteelements.Thefiniteelementsincorporateviscoelasticspringsandmasses.Theconstitutivecharacteristicsofthefiniteelementsmustrepresenttherheologicalcharacteristicsofthebelt.Dynamicanalysisproducesthebelttensionandpowerconsumptionduringnonstationaryoperation,likestartingandstopping,ofthebeltconveyor.Thispaperdiscussesthedesignofhighbeltspeedconveyors,inparticulartheimpactofusinghighbeltspeedsontheperformanceoftheconveyorbeltintermsofenergyconsumptionandsafetyfactorrequirements.Usinghighbeltspeedsalsorequireshighreliabilityofconveyorcomponentssuchasidlerstoachieveanacceptablecomponentlife.Anotherimportantaspectofhighspeedbeltconveyordesignisthedesignofefficientfeedinganddischargearrangements.Theseaspectswillbediscussedbriefly.Manymethodsofanalyzingabeltsphysicalbehaviorasarheologicalspringhavebeenstudiedandvarioustechniqueshavebeenused.Anappropriatemodelneedstoaddress1.Elasticmodulusofthebeltlongitudinaltensilemember2.Resistancestomotionwhicharevelocitydependenti.e.idlers3.Viscoelasticlossesduetorubberidlerindentation4.ApparentbeltmoduluschangesduetobeltsagbetweenidlersSincethemathematicsnecessarytosolvethesedynamicproblemsareverycomplex,itisnotthegoalofthispresentationtodetailthetheoreticalbasisofdynamicanalysis.Rather,thepurposeistostressthatasbeltlengthsincreaseandashorizontalcurvesanddistributedpowerbecomesmorecommon,theimportanceofdynamicanalysistakingbeltelasticityintoaccountisvitaltoproperlydevelopcontrolalgorithmsduringbothstoppingandstarting.Usingthe8.5kmconveyorinFigure23asanexample,twosimulationsofstartingwereperformedtocomparecontrolalgorithms.Witha2x1000kWdriveinstalledattheheadend,a2x1000kWdriveatamidpointcarrysidelocationanda1x1000kWdriveatthetail,extremecaremustbetakentoinsurepropercoordinationofalldrivesismaintained.Figure27illustratesa90secondstartwithverypoorcoordinationandsevereoscillationsintorquewithcorrespondingoscillationsinvelocityandbelttensions.TheT1/T2slipratioindicatesdriveslipcouldoccur.Figure28showsthecorrespondingchartsfromarelativelygood180secondstartcoordinatedtosafelyandsmoothlyacceleratetheconveyor.

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