带式输送机及其牵引系统-外文翻译

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1、外文原文BeltConveyingSystemsDevelopmentofdrivingsystemAmongthemethodsofmaterialconveyingemploved,beltconveyorsplayaveryimporientpartinthereliablecarryingofmaterialoverlongdistancesatcompetitivecost.Conveyorsystemshavebecomelargerandmorecomplexanddrivesystemshavealsobeengoingthroughaprocessof

2、evolutionandwillcontinuetodoso.Nowadays,biggerbeltsrequiremorepowerandhavebroughttheneedforlargerindividualdrivesaswellasmultipledrivessuchas3drivesof750kWforonebelt(thisisthecasefortheconveyordrivesinChengzhuangMine).Theabilitytocontroldriveaccelerationtorqueiscriticaltobeltconveyors'pe

3、rformance.Aefficientdrivesystemshouldbeabletoprovidesmooth,softstartswhilemaintainingbelttensionswithinthespecifiedsafelimits.Forloadsharingonmultipledrives.torqueandspeedcontrolarealsoconsiderationsinthedrivesystem'sdesign.Duetotheadvancesinconveyordrivecontroltechnology,atpresentmanymo

4、rereliable.Cost-effectiveandperformance-drivenconveyordrivesystemscoveringawiderangeofpowerareavailableforcustomers'choices[1].1Analysisonconveyordrivetechnologies1.1DirectdrivesFull-voltagestarters.Withafull-voltagestarterdesign,theconveyorheadshaftisdirect-coupledtothemotorthroughthege

5、ardrive.Direct8full-voltagestartersareadequateforrelativelylow-power,simple-Profileconveyors.Withdirectfull-voltagestarters.nocontrolisprovidedforvariousconveyorloadsand.dependingontheratiobetweenfull-andno-loadpowerrequirements,emptystartingtimescanbethreeorourtimesfasterthanfullload.Th

6、emaintenance-freestartingsystemissimple,low-costandveryreliable.However,theycannotcontrolstartingtorqueandmaximumstalltorque;therefore.theyarelimitedtothelow-power,simple-profileconveyorbeltdrives.Reduced-voltagestarters.Asconveyorpowerrequirementsincrease,controllingtheappliedmotortorqu

7、eduringtheaccelerationperiodbecomesincreasinglyimportant.Becausemotortorqueisafunctionofvoltage,motorvoltagemustbecontrolled.Thiscanbeachievedthroughreduced-voltagestartersbyemployingasiliconcontrolledrectifier(SCR).AcommonstartingmethodwithSCRreduced-voltagestartersistoa