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外文翻译---带式输送机及其牵引系统.doc

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外文翻译---带式输送机及其牵引系统.doc

翻译部分英文原文BELTCONVEYINGSYSTEMSDEVELOPMENTOFDRIVINGSYSTEMAMONGTHEMETHODSOFMATERIALCONVEYINGEMPLOYED,BELTCONVEYORSPLAYAVERYIMPORTANTPARTINTHERELIABLECARRYINGOFMATERIALOVERLONGDISTANCESATCOMPETITIVECOST.CONVEYORSYSTEMSHAVEBECOMELARGERANDMORECOMPLEXANDDRIVESYSTEMSHAVEALSOBEENGOINGTHROUGHAPROCESSOFEVOLUTIONANDWILLCONTINUETODOSO.NOWADAYS,BIGGERBELTSREQUIREMOREPOWERANDHAVEBROUGHTTHENEEDFORLARGERINDIVIDUALDRIVESASWELLASMULTIPLEDRIVESSUCHAS3DRIVESOF750KWFORONEBELTTHISISTHECASEFORTHECONVEYORDRIVESINCHENGZHUANGMINE.THEABILITYTOCONTROLDRIVEACCELERATIONTORQUEISCRITICALTOBELTCONVEYORS’PERFORMANCE.ANEFFICIENTDRIVESYSTEMSHOULDBEABLETOPROVIDESMOOTH,SOFTSTARTSWHILEMAINTAININGBELTTENSIONSWITHINTHESPECIFIEDSAFELIMITS.FORLOADSHARINGONMULTIPLEDRIVES.TORQUEANDSPEEDCONTROLAREALSOIMPORTANTCONSIDERATIONSINTHEDRIVESYSTEM’SDESIGNDUETOTHEADVANCESINCONVEYORDRIVECONTROLTECHNOLOGY,ATPRESENTMANYMORERELIABLE.COSTEFFECTIVEANDPERFORMANCEDRIVENCONVEYORDRIVESYSTEMSCOVERINGAWIDERANGEOFPOWERAREAVAILABLEFORCUSTOMERS’CHOICES11ANALYSISONCONVEYORDRIVETECHNOLOGIES1.1DIRECTDRIVESFULLVOLTAGESTARTERS.WITHAFULLVOLTAGESTARTERDESIGN,THECONVEYORHEADSHAFTISDIRECTCOUPLEDTOTHEMOTORTHROUGHTHEGEARDRIVE.DIRECTFULLVOLTAGESTARTERSAREADEQUATEFORRELATIVELYLOWPOWER,SIMPLEPROFILECONVEYORS.WITHDIRECTFU11VOLTAGESTARTERS.NOCONTROLISPROVIDEDFORVARIOUSCONVEYORLOADSAND.DEPENDINGONTHERATIOBETWEENFU11ANDNO1OADPOWERREQUIREMENTS,EMPTYSTARTINGTIMESCANBETHREEORFOURTIMESFASTERTHANFULLLOAD.THEMAINTENANCEFREESTARTINGSYSTEMISSIMPLE,LOWCOSTANDVERYRELIABLE.HOWEVER,THEYCANNOTCONTROLSTARTINGTORQUEANDMAXIMUMSTALLTORQUE;THEREFORE.THEYARELIMITEDTOTHELOWPOWER,SIMPLEPROFILECONVEYORBELTDRIVES.REDUCEDVOLTAGESTARTERS.ASCONVEYORPOWERREQUIREMENTSINCREASE,CONTROLLINGTHEAPPLIEDMOTORTORQUEDURINGTHEACCELERATIONPERIODBECOMESINCREASINGLYIMPORTANT.BECAUSEMOTORTORQUE1SAFUNCTIONOFVOLTAGE,MOTORVOLTAGEMUSTBECONTROLLED.THISCANBEACHIEVEDTHROUGHREDUCEDVOLTAGESTARTERSBYEMPLOYINGASILICONCONTROLLEDRECTIFIERSCR.ACOMMONSTARTINGMETHODWITHSCRREDUCEDVOLTAGESTARTERSISTOAPPLYLOWVOLTAGEINITIALLYTOTAKEUPCONVEYORBELTSLACK.ANDTHENTOAPPLYATIMEDLINEARRAMPUPTOFULLVOLTAGEANDBELTSPEED.HOWEVER,THISSTARTINGMETHODWILLNOTPRODUCECONSTANTCONVEYORBELTACCELERATION.WHENACCELERATIONISCOMPLETE.THESCRS,WHICHCONTROLTHEAPPLIEDVOLTAGETOTHEELECTRICMOTOR.ARELOCKEDINFULLCONDUCTION,PROVIDINGFU11LINEVOLTAGETOTHEMOTOR.MOTORSWITHHIGHERTORQUEANDPULLUPTORQUE,CANPROVIDEBETTERSTARTINGTORQUEWHENCOMBINEDWITHTHESCRSTARTERS,WHICHAREAVAILABLEINSIZESUPTO750KW.WOUNDROTORINDUCTIONMOTORS.WOUNDROTORINDUCTIONMOTORSARECONNECTEDDIRECTLYTOTHEDRIVESYSTEMREDUCERANDAREAMODIFIEDCONFIGURATIONOFASTANDARDACINDUCTIONMOTOR.BYINSERTINGRESISTANCEINSERIESWITHTHEMOTOR’SROTORWINDINGS.THEMODIFIEDMOTORCONTROLSYSTEMCONTROLSMOTORTORQUE.FORCONVEYORSTARTING,RESISTANCEISPLACEDINSERIESWITHTHEROTORFORLOWINITIALTORQUE.ASTHECONVEYORACCELERATES,THERESISTANCEISREDUCEDSLOWLYTOMAINTAINACONSTANTACCELERATIONTORQUE.ONMULTIPLEDRIVESYSTEMS.ANEXTERNALSLIPRESISTORMAYBELEFTINSERIESWITHTHEROTORWINDINGSTOAIDINLOADSHARING.THEMOTORSYSTEMSHAVEARELATIVELYSIMPLEDESIGN.HOWEVER,THECONTROLSYSTEMSFORTHESECANBEHIGHLYCOMPLEX,BECAUSETHEYAREBASEDONCOMPUTERCONTROLOFTHERESISTANCESWITCHING.TODAY,THEMAJORITYOFCONTROLSYSTEMSARECUSTOMDESIGNEDTOMEETACONVEYORSYSTEM’SPARTICULARSPECIFICATIONS.WOUNDROTORMOTORSAREAPPROPRIATEFORSYSTEMSREQUIRINGMORETHAN400KW.DCMOTOR.DCMOTORS.AVAILABLEFROMAFRACTIONOFTHOUSANDSOFKW,AREDESIGNEDTODELIVERCONSTANTTORQUEBELOWBASESPEEDANDCONSTANTKWABOVEBASESPEEDTOTHEMAXIMUMALLOWABLEREVOLUTIONSPERMINUTER/MIN.WITHTHEMAJORITYOFCONVEYORDRIVES,ADCSHUNTWOUNDMOTORISUSED.WHEREINTHEMOTOR’SROTATINGARMATUREISCONNECTEDEXTERNALLY.THEMOSTCOMMONTECHNOLOGYFORCONTROLLINGDCDRIVESISASCRDEVICE.WHICHALLOWSFORCONTINUALVARIABLESPEEDOPERATION.THEDCDRIVESYSTEMISMECHANICALLYSIMPLE,BUTCANINCLUDECOMPLEXCUSTOMDESIGNEDELECTRONICSTOMONITORANDCONTROLTHECOMPLETESYSTEM.THISSYSTEMOPTIONISEXPENSIVEINCOMPARISONTOOTHERSOFTSTARTSYSTEMS.BUTITISARELIABLE,COSTEFFECTIVEDRIVEINAPPLICATIONSINWHICHTORQUE,1OADSHARINGANDVARIABLESPEEDAREPRIMARYCONSIDERATIONS.DCMOTORSGENERALLYAREUSEDWITHHIGHERPOWERCONVEYORS,INCLUDINGCOMPLEXPROFILECONVEYORSWITHMULTIPLEDRIVESYSTEMS,BOOSTERTRIPPERSYSTEMSNEEDINGBELTTENSIONCONTROLANDCONVEYORSREQUIRINGAWIDEVARIABLESPEEDRANGE.1.2HYDROKINETICCOUPLINGHYDROKINETICCOUPLINGS,COMMONLYREFERREDTOASFLUIDCOUPLINGS.ARECOMPOSEDOFTHREEBASICELEMENTS;THEDRIVENIMPELLER,WHICHACTSASACENTRIFUGALPUMP;THEDRIVINGHYDRAULICTURBINEKNOWNASTHERUNNERANDACASINGTHATENCLOSESTHETWOPOWERCOMPONENTS.HYDRAULICFLUIDISPUMPEDFROMTHEDRIVENIMPELLERTOTHEDRIVINGRUNNER,PRODUCINGTORQUEATTHEDRIVENSHAFT.BECAUSECIRCULATINGHYDRAULICFLUIDPRODUCESTHETORQUEANDSPEED,NOMECHANICALCONNECTIONISREQUIREDBETWEENTHEDRIVINGANDDRIVENSHAFTS.THEPOWERPRODUCEDBYTHISCOUPLINGISBASEDONTHECIRCULATEDFLUID’SAMOUNTANDDENSITYANDTHETORQUEINPROPORTIONTOINPUTSPEED.BECAUSETHEPUMPINGACTIONWITHINTHEFLUIDCOUPLINGDEPENDSONCENTRIFUGALFORCES.THEOUTPUTSPEEDISLESSTHANTHEINPUTSPEED.REFERREDTOASSLIP.THISNORMALLYISBETWEENLAND3.BASICHYDROKINETICCOUPLINGSAREAVAILABLEINCONFIGURATIONSFROMFRACTIONALTOSEVERALTHOUSANDKW.FIXEDFILLFLUIDCOUPLINGS.FIXEDFILLFLUIDCOUPLINGSARETHEMOSTCOMMONLYUSEDSOFTSTARTDEVICESFORCONVEYORSWITHSIMPLERBELTPROFILESANDLIMITEDCONVEX/CONCAVESECTIONS.THEYARERELATIVELYSIMPLE,1OWCOST,RELIABLE,MAINTENANCEFREEDEVICESTHATPROVIDEEXCELLENTSOFTSTARTINGRESULTSTOTHEMAJORITYOFBELTCONVEYORSINUSETODAY.VARIABLEFILLDRAINCOUPLINGS.DRAINABLEFLUIDCOUPLINGSWORKONTHESAMEPRINCIPLEASFIXEDFILLCOUPLINGS.THECOUPLING’SIMPELLERSAREMOUNTEDONTHEACMOTORANDTHERUNNERSONTHEDRIVENREDUCERHIGHSPEEDSHAFT.HOUSINGMOUNTEDTOTHEDRIVEBASEENCLOSESTHEWORKINGCIRCUIT.THECOUPLING’SROTATINGCASINGCONTAINSBLEEDOFFORIFICESTHATCONTINUALLYALLOWFLUIDTOEXITTHEWORKINGCIRCUITINTOASEPARATEHYDRAULICRESERVOIR.OILFROMTHERESERVOIRISPUMPEDTHROUGHAHEATEXCHANGERTOASOLENOIDOPERATEDHYDRAULICVALVETHATCONTROLSTHEFILLINGOFTHEFLUIDCOUPLING.TOCONTROLTHESTARTINGTORQUEOFASINGLEDRIVECONVEYORSYSTEM,THEACMOTORCURRENTMUSTBEMONITOREDTOPROVIDEFEEDBACKTOTHESOLENOIDCONTROLVALVE.VARIABLEFILLDRAINCOUPLINGSAREUSEDINMEDIUMTOHIGHKWCONVEYORSYSTEMSANDAREAVAILABLEINSIZESUPTOTHOUSANDSOFKW.THEDRIVESCANBE

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