会员注册 | 登录 | 微信快捷登录 QQ登录 微博登录 | 帮助中心 人人文库renrendoc.com美如初恋!
站内搜索 百度文库

热门搜索: 直缝焊接机 矿井提升机 循环球式转向器图纸 机器人手爪发展史 管道机器人dwg 动平衡试验台设计

   首页 人人文库网 > 资源分类 > DOC文档下载

外文翻译--风靡时期.doc

  • 资源星级:
  • 资源大小:45.50KB   全文页数:9页
  • 资源格式: DOC        下载权限:注册会员/VIP会员
您还没有登陆,请先登录。登陆后即可下载此文档。
  合作网站登录: 微信快捷登录 支付宝快捷登录   QQ登录   微博登录
友情提示
2:本站资源不支持迅雷下载,请使用浏览器直接下载(不支持QQ浏览器)
3:本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰   

外文翻译--风靡时期.doc

英文原文BoomtimeAhealthymarketmeansthatundergroundtruckandLHDmarkersareenjoyinghighorderlevels,withnewmodelsandtechnologyalsocoming.intheLHDsector,severalnewmodelsarealreadyonthemarketfromfirmsincludingEJC,Fermel,RhamEquipmentandSchopfWMEOctNov2004,whileAtlasCopcointendstolaunchatleastonenewdesignin2005–possiblyanSt14.ButitisthetrucksectorthatisthemostactiverightnowwithrenewedemphasisonpowertoweightratiosrightthroughthepayloadrangeThelatestmodelsaretakingadvantageofadvancesindieseltechnologybyfittingmorepowerfulenginesandallowingbetterspeedsonsteepramphauls.Theimpactofthisissignificant,ashigherspeedsmeanlowercycletimesandoffermajorgainsinproductivity,evenallowingreductionsinfleetsizes.Atthetopofthepayloadscalecompetitionisnowparticularlyfierce.SandvikTamrockiscertainlypushingtheboundarieswithitsToro60,athreeaxletruckwitharigidchassisanda60tonnecapacity.ThisCumminspoweredtruckoffersagoodpowertoweightratioandapayloadadvantageoverCaterpillarsAD55andatlasCoposMT5010thatSandvikTamrocksaysshouldallowminestotrimfleetsize,especiallyoverlongerramphauls.sandvikTamrockexpectstheToro60totakebacksomeofthemarketclaimedbyCatssuccessfulAD55,withits55tonnepayload.HoweverAtlasCopcoisfightingbackagainstbothCaterpillarandSandviktamrockwithyetanotherupgradetoitsMT5010truck,providingapowerincreasefrom488597kw/650800hp.ThenewCumminsQsk19dieselbooststheMT5010spowertoweightratiofrom5.276.5kw/tonne,allowingittoreclaimgroundovertheAD55andToro60,despitetheirlargerpayload.AtlseCopcoalsosaysthatdrivelineproblemswhichafflictedearliertruckdesignshavelongsincebeeneliminated.ThecompanypointsoutthatMT5010isasuccessfuldesignwithunitsoperatingIAustraliarecordingspeedsof14kphon110ramps,despitehaving23,000hoursontheclock.Evaluatingwhichofthesethreetrucksoffersthehighestproductivitycouldonlybeachievedbydetailedstudyandperhapsrequiretesting,possiblywithadifferentresultdependingonthenatureofthespecificminingapplication.TherevisedMT5010hasahigherpowertoweightratiothaneithertheAD55ortheToro60butthesetruckshavebiggerpayloadsof55and60tonnesrespectively.Themachinethatbestsuitsagivenminingoperationmaybeduetoanumberofbasicfactorssuchashauldistanceandrampgradientaswellasventilationinfrastructure,ambienttemperatureandevenmaterialtype.Overallthoughthecustomerwillbethewinner,withthelatestlargeAtlasCopco,CaterpillarandSandvikTamrocktrucksallofferingmuchbetterproductivityandreliabilitythanwaseveravailabletothe50tonneclassbefore.Thesamedortofpowertoweightratiogainscanbeseenfurtherdownthetruckpayloadrange.AtlasCopco,Caterpillar,Dux,EJC,MTIandZanamlegmethaveallfittedmorepowerfuldieselstotruckswithpayloadsinthe1230tonnerange,withsimilarbenefitstothoseseenatthetopofthecapacityscale.Forexample,oneCanadianminereplaceditsearliergeneration16and17tonnerswithnewer20tonners,whichoffershorttraveltimesonramp,despitetheirincreasedpayloadandthishasresultedinasubstantialproductivitygainoverall.Thatthenewgenerationofenginesproducemorepowerfromsimilarouterdimensionsisimportant,astheygiveabetterpayload/litreoffuelburned.Howeverthecleaneremissionshaveaddedbenefits,withcostadvantagestomineventilationrequirements.Ingeneral,thenewsmallmidsizedtrucksthemselvesareexternallysimilartopreviousmodels,butarefittedwithstrongerdrivetrainsandaxlestocopewiththeadditionalpowerWMEOct2004WMENov2004.Smalldetailchangeslikeextendedoillifeorfilterswithreplaceableelementsmakeidentifiablebenefitstoservicecosts.Whilethebasicdesignsoftheseupdatedtrucksremainssimilar,thebetterdrivelinesandnewgenerationdieselsmeanthatthemachinesrequirelessmaintenancearemorereliableandareconsiderablycheapertorun.SelfdriveAutomationisstillontheagendawithregardtoLHDsandtrucks,withthemanybenefitsbeingshownatthoseminesthathavetakentheplungeandoptedforthistechnology.TheseisstillprogresstobemadewithregardtoordersbutCaterpillarandSandvilkTamrockarebothpushinghardtosignupcustomersfortheirLHDandtruckautomationsystems,MINEGEMandAutominerespectively.AtthemomentonlyCodelcoisusingthefullAutomineautomationsystematthePipaNorteandDiabloRegimientozonesofitsEITenientecoppermineinChile.ButDeBeersandSandvikTAmrockaredevelopingasystemfortheFinschmineinSouthAfrica.AndwhileCaterpillarhasyettonotchupacommercialsaleforMINEGEM,thetechnologyisbeingusedforproductionatthenorthparkesandOlympicDamminesinAustralia.TherearealotofsimilaritiesinthewayMINEGEMandAutominework,withlaserequipmentmountedonboardtheLHDs.Thesescanthetunnelsaheadofthemachinesastheytram,pickingupchangesinthetunnelprofileandallowingthemachinetorecognizeitspositioninmilliseconds.Thelasersupdatetunnelmapscontinuouslyto,resultinginlargevolumesofdateshuttlingbackandforthconstantly.CatsMINEGEMsystemoperatesonawirelessLANinfrastructurewithan11Mbpscapacity.SandvikTAmrocksAutominesystemrequiressimilarbroadbandcommunicationalcapabilities.BothMINEGEMandAutominearecontrolledbyconventionalandreadilyavailablecomputinghardware,whileagooddealofthecomponentsisstandardofftheshelfitemsselectedfortheirabilitytocopewiththetoughminingcycle.Withthesetechnologies,oneoperatorcansupervisetherunningofuptothreeLHDsthatrunmoreorlessautonomously,withtheonlymanualinputbeingforthebucketloadingpartoftheiroperatingcycle.CaterpilliarsMINEGEMisapackagebuiltupofseverallayersandthisallowscustomerstoselecttheseparatecomponentstheyrequire.ThetacticallayerofMINEGEMprovidesautomaticsteeringforanLHDandpreventsitfromcollidingwiththewallsofthetunneloragainstothervehicles.Theoperatorfillsthebucketandselectsforwardorreverse,withthesystemprovidingautomatedtrammingandbucketdumping.ThestrategiclayerismorecomplexasthisintegratestheoperationofuptothreeLHDs,overseestheiroperationandhashigherlevelplanningcapabilities.Itisthestrategiclayerthatisinchareoftrafficcontrolfunctions,sothatmultiplecyclescanbescriptedforblendingoresfromdifferentdrawpointsforinstance,withtheoverallbenefitofincreasingproductionefficiency.Safetyisimprovedastheoperatorscanbesituatedawayfromwherethemachinesarerunningtheydontevenhavetobeinthemineatallandintheory,couldbesittinginanofficeontheothersideoftheworld.Moreover,themachinesrequirelessmaintenanceandhavelowerrunningcostsasgearchangesaremadeatoptimumtimes,enginesarenotoverrevved,thereislesswheelspinandtheriskfromcollisionswithtunnelwallsofothermachinesisallbuteliminated.However,thecompleteAutomineandMINEGEMtechnologiesarenotinexpensiveandsuitapplicationsinpurposebuiltmineareasorevenmines.Theautomatedequipmentrunsinpartsoftheminethatareseparatedfromotheroperationsandwithpersonnelaccesscarefullycontrolled.Therearehowevercomparativelyfewlargeand/ornewmineswiththesortofblockcavingorsublevelcavingapplicationsthatbestsuitthissophisticatedfullautomationtechnologyandcanjustifytheinvestment.Asaresult,CaterpilliarandSandvikTamrockseparatelyidentifiedaneedforlesssophisticatedsystemsthatoffermanyofthesameoperatingbenefits,whilebeingsubstantiallylesscostly.ByoptingforjustthetacticallayerofMINEGEMcalledCoPilot,aminingfirmcanintroduceaneffectiveandcomparativelylowcosttechnologyforsingleLHDautomation.AndCOPilotcomeswithamanualoverride,allowingittobeusedasaconventionalremotecontrolif/whenrequired.Inthisrespect,SandvikTamrockhasabroadlysimilarproductintheshapeofitsAutomatesystem,whichisalsodesignedforsingleLHDautomateandhasequivalentcontrolspecifications.WithAutomationorCoPilot,minescanintroducesingleLHDautomationintoapplicationswhereconventionalremotecontrolsystemsareusedatpresent.Theadvantageofthisisthatsinglemachinescanbenefitfromtheautomatedtramming,withouttheexpenseofthecompletemachineautomationpackageortheinherentchangestoinfrastructureandminelayout.BothCaterpilliarandSandvikTamrockpointoutthatthistechnologyhashugepotentialwithfirmsusingconventionalremotecontrolandwillbeofparticularbenefitatmineswithhighincidencesLHDcollisiondamage.And,asanyonewhohaseveroperatedaradiocontrolledcarcanattest,itcanbedifficulttojudgedistancesbetweenamovingmachineanditssurroundingsfromadistance.Thesingleautomationequipmentwilltakeawaythisriskofcollisionsandmakesubstantialreductionsinmachinedowntimeandrepairs,aswellasboostingproductivity.AstudycommissionedbyCaterpillarfromAustralianbodySTEMshowsthatreplacingconventionalremotecontrolswithsimplersingleLHDsystemswouldprovidepaybacktimesofthreeyearsandevenlessinsomeinstances,whileprovidingproductivitygainsofupto37.Forthemoment,miningfirmsseemreluctanttoinvestinfullLHDautomationduetotheexpenseandcomplexityofthetechnology.ButwiththeproductionandcostbenefitsofferedbyCatsMINEGEMCoPilotandSandvikTamrocksAutomatesystemforsingleLHDautomationinexistingmines,thatsituationcouldwellchangesoon.RussianfirmMOaZbuildstwoundergroundtrucks,the74059586fornarrowoperatingconditionsandthemoreconventional7529,bothofwhichhave22tonnepayloads.The74059586weighs19.5tonnesunladen,hasacanopyasstandard,ispoweredbyaJMZ238KM2dieselratedat140kwandmeasures2.9mwideforuseinnarrowaccessareas.Asthismodelhas2WDitcancopewith9°maximumslopesandbestsuitsflathaulsortunnelingapplications,offeringamaximumspeedof40kph.The7529,weighs24tonnesunladen,features4WDandhasamorepowerfulJMZ238BN2

注意事项

本文(外文翻译--风靡时期.doc)为本站会员(淘宝运营)主动上传,人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网([email protected]),我们立即给予删除!

温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。

copyright@ 2015-2017 人人文库网网站版权所有
苏ICP备12009002号-5