机械论文翻译

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1、英文原文BeltConveyingSystemsDevelopmentofdrivingsystemAmongthemethodsofmaterialconveyingemployed,beltconveyorsplayaveryimportantpartinthereliablecarryingofmaterialoverlongdistancesatcompetitivecost・Conveyorsystemshavebecomelargerandmorecomplexanddrivesystemshavealsobeengoingthro

2、ughaprocessofevolutionandwillcontinuetodoso.Nowadays,biggerbeltsrequiremorepowerandhavebroughttheneedforlargerindividualdrivesaswellasmultipledrivessuchas3drivesof750kWforonebelt(thisisthecasefortheconveyordrivesinChengzhimngMine)•Theabilitytocontroldriveaccelerationtorqueis

3、criticaltobeltconveyors'performance.Anefficientdrivesystemshouldbeabletoprovidesmooth,softstartswhilemaintainingbelttensionswithinthespecifiedsafelimits.Forloadsharingonmultipledrives,torqueandspeedcontrolarealsoimportantconsiderationsinthedrivesystem"sdesign.Duetotheadveinc

4、esinconveyordrivecontroltechnology,atpresentmanymorereliable.Cost-effectiveandperformance-drivenconveyordrivesystemscoveringawiderangeofpowerareavailableforcustomers'choices[1]・1Analysisonconveyordrivetechnologies1.1DirectdrivesFull-voltagestarters.Withafull-voltagestarterde

5、sign,theconveyorheadshaftisdirect-coupledtothemotorthroughthegeardrive.Directfull-voltagestartersareadequateforrelativelylow-power,simple-profileconveyors.Withdirectfull-voltagestarters,nocontrolisprovidedforvariousconveyorloadseind.dopendingontheratiobetweenfull-andno-loadp

6、owerrequiremcnts,emptystartingtimescanbethreeorfourtimesfasterthanfullload.Themaintenance-freestartingsystemissimple,low-costandveryreliable.However,theycannotcontrolstartingtorqueandmaximumstal1torque；therefore,theyarelimitedtothelow-power,simple-profileconveyorbeltdrives.R

7、educed-voltagestarters.Asconveyorpowerrequirementsincrease,controllingtheappliedmotortorqueduringtheaccelerationperiodbecomesincreasinglyimportant.BecausemotortorqueIsafunctionofvoltage,motorvoltagemustbecontrolled.Thiscanbeachievedthroughreduced-voltagestartersrectifier(SCR

8、).AcommonbyemployingasiliconcontrolledstartingmethodwithSCRreduced-voltages