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ID:236164
大小:38.62 KB
页数:11页
时间:2017-07-11
《带式输送机及其牵引系统-毕业设计外文翻译》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第11页外文翻译英文原文BeltConveyingSystemsDevelopmentofdrivingsystemAmongthemethodsofmaterialconveyingemployed,beltconveyorsplayaveryimportantpartinthereliablecarryingofmaterialoverlongdistancesatcompetitivecost.Conveyorsystemshavebecomelargerandmorecomplexanddrivesyst
2、emshavealsobeengoingthroughaprocessofevolutionandwillcontinuetodoso.Nowadays,biggerbeltsrequiremorepowerandhavebroughttheneedforlargerindividualdrivesaswellasmultipledrivessuchas3drivesof750kWforonebelt(thisisthecasefortheconveyordrivesinChengzhuangMine).Thea
3、bilitytocontroldriveaccelerationtorqueiscriticaltobeltconveyors’performance.Anefficientdrivesystemshouldbeabletoprovidesmooth,softstartswhilemaintainingbelttensionswithinthespecifiedsafelimits.Forloadsharingonmultipledrives.torqueandspeedcontrolarealsoimporta
4、ntconsiderationsinthedrivesystem’sdesign.Duetotheadvancesinconveyordrivecontroltechnology,atpresentmanymorereliable.Cost-effectiveandperformance-drivenconveyordrivesystemscoveringawiderangeofpowerareavailableforcustomers’choices[1].1Analysisonconveyordrivetec
5、hnologies1.1DirectdrivesFull-voltagestarters.Withafull-voltagestarterdesign,theconveyorheadshaftisdirect-coupledtothemotorthroughthegeardrive.Directfull-voltagestartersareadequateforrelativelylow-power,simple-profileconveyors.Withdirectfu11-voltagestarters.no
6、controlisprovidedforvariousconveyorloadsand.dependingontheratiobetweenfu11-andno-1oadpowerrequirements,emptystartingtimescanbethreeorfourtimesfasterthanfullload.Themaintenance-freestartingsystemissimple,low-costandveryreliable.However,theycannotcontrolstartin
7、gtorqueandmaximumstalltorque;therefore.theyarelimitedtothelow-power,simple-profileconveyorbeltdrives.Reduced-voltagestarters.Asconveyorpowerrequirementsincrease,controllingtheapplied第11页motortorqueduringtheaccelerationperiodbecomesincreasinglyimportant.Becaus
8、emotortorque1safunctionofvoltage,motorvoltagemustbecontrolled.Thiscanbeachievedthroughreduced-voltagestartersbyemployingasiliconcontrolledrectifier(SCR).AcommonstartingmethodwithSCRreduce
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