英文翻译论文

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1、ZHENGZHOUUNIVERSITYOFINDUSTRIALTECHNOLOGY本科生毕业设计（论文）专业外文翻译原文：BeltConveyingSystemsDevelopmentOfDrivingSystem译文：带式输送机及其牵引系统指导教师：张玉琴职称:副教授学生姓名：郭航学号:1102130109专业：机械设计制造及其自动化院（系）：机电工程学院2015年4月10日BeltConveyingSystemsDevelopmentofdrivingsystemAmongthemethodsofmaterialconveyingemployed,beltconveyorsplayav

2、eryimportantpartinthereliablecarryingofmaterialoverlongdistancesatcompetitivecost.Conveyorsystemshavebecomelargerandmorecomplexanddrivesystemshavealsobeengoingthroughaprocessofevolutionandwillcontinuetodoso.Nowadays,biggerbeltsrequiremorepowerandhavebroughttheneedforlargerindividualdrivesaswellasm

3、ultipledrivessuchas3drivesof750kWforonebelt(thisisthecasefortheconveyordrivesinChengzhuangMine).Theabilitytocontroldriveaccelerationtorqueiscriticaltobeltconveyors'performance.Anefficientdrivesystemshouldbeabletoprovidesmooth,softstartswhilemaintainingbelttensionswithinthespecifiedsafelimits.Forlo

4、adsharingonmultipledrives,torqueandspeedcontrolarealsoimportantconsiderationsinthedrivesystem，sdesign-Duetotheadvancesinconveyordrivecontroltechnology,atpresentmanymorereliable•Cost-effectiveandperformance-drivenconveyordrivesystemscoveringawiderangeofpowerareavailableforcustomers5choices.1Analysi

5、sonconveyordrivetechnologiesLIDirectdrivesFull-voltagestarters.Withafull-voltagestarterdesign,theconveyorheadshaftisdirect-coupledtothemotorthroughthegeardrive.Directfull-voltagestartersareadequateforrelativelylow・power,simple-profileconveyors.Withdirectful1-voltagestarters.nocontrolisprovidedforv

6、ariousconveyorloadsand.dependingontheratiobetweenful1-andno・loadpowerrequirements,emptystartingtimescanbethreeorfourtimesfasterthanfullload•Themaintenance-freestartingsystemissimple，low-costandveryreliable.However,theycannotcontrolstartingtorqueandmaximumstalltorque；therefore,theyarelimitedtothelo

7、w・power,simple-profileconveyorbeltdrives.Reduced-voltagestarters.Asconveyorpowerrequirementsincrease,controllingtheappliedmotortorqueduringtheaccelerationperiodbecomesincreasinglyimportant.BecausemotortorqueIsafu