刮板輸送機外文翻譯文獻

刮板輸送機外文翻譯文獻Minescraperconveyorsoft-startmode

ofselectionandapplicationHighyieldandhighefficiencyinthecoalminefullymechanizedcoalfaceofthebuilding,tofacebig-long,largetosupporttherequirementsofthepowerofShearerandscraperconveyor.Ordinaryfullymechanizedcoalfaceofthelong-generalinabout150m,scraperconveyortransportcapacityof500t/haroundhighyieldandhighefficiencyandfullymechanizedcoalfaceofthelong-Generalto180~300m,scraperconveyortransportcapacityof800t/handabove,therefore,conveyorpowergreatergrowth.PingdingshanCoalMiningGroupCompanytoasanexample,thescraperconveyorofpowerinmost400(2x200)kWandabove,thelargestforthe750(2x375)kW.Scraperconveyortothestart-uplaunchedmainlytwo-speed,limitedbyasmallnumberoffillinghydrauliccoupler,whichstartedtwokindsofways,notonlyoperatingcosts,anditstandshigh.Therefore,theneedtoseeknewtechnologyandequipmenttomeettherequirementsofhighyieldandhighefficiency.一、currentsituationandexistingproblems(一)limitfillinghydrauliccouplerinthehigh-power,bigload,itssize,whenitwiththemotorandreducerconnection,thegreatertheshareofspace.Limitedspaceintheworkoftheoccasion,toomuchvolumewillscraperconveyorlayoutdifficult.Coupledwithincreasedhydraulictransmissiondistanceandhigh-speedrotatingstateandeasytohaveagreaterimpactontheradialdynamicload,andtheslowdowncausedbyelectricalinstallationsdamaged.Coupledwiththeinputandoutputspeedthanthespeedofusuallynomorethan97percent,thatisimpossibletoachieveinputshaftandoutputshaftofsync,whichmustexistgreaterpowerloss,reducingtheefficiencyofthetransmissionsystem.刮板輸送機外文翻譯文獻刮板輸送機外文翻譯文獻刮板輸送機外文翻譯文獻刮板輸送機外文翻譯文獻（二）two-speedmotordrivesystemiscurrentlyinChina'sminingscraperconveyorincommon.Undernormalcircumstances,theratedspeedmotortostartthehalf,correspondingtostartmotorpowerisalsoratedpowerofthehalf.Tolow-speedmotorlaunch,whenthecompletionoftheprocessinitiatedaftertheswitchtohigh-speedoperation,fromstarttothenormaloperationofsub-levels,inpart,reducetheimpactofthelaunch.Inthiswaytousethespecialtwo-motorwinding,two-andtwo-speedcablerootswitch.Two-speedmotorcomplexstructure,highcost,powersupplysystemequivalenttotwoMotors,low-speedswitchingnoteffectivelycontrolled,thepointoffailure,equipmentcables,atthesametime,thefaultlineswillbedoubledtheincrease.二、soft-startseveraladvancedmethodsofcomparisonthyristorsurgesoft-startmode.Starttheprocesslaunchedattheslope,pulseconflictjumpstart,speeduptheslope,fastslope.Pulseconflictwaycanjumpstartthebiggestshort-termoutputofover95percentoftheratedvoltage,toimposeashort-timegreatstartingtorque（equivalentto90percentofdirectstartingtorque）,toovercomethestaticfrictionandtheinertiaofthetransmissionsystem.Thissoft-startapproachandbroadprospectsforapplication.viscousliquidtransmissionsoft-startmode.DodgeisatypicalU.S.companyCST（consecutivestarttransmission）soft-startdevices.CSTsoft-startdevicescurrentlyreliesmainlyonimports,highprices,thegeneralmineunbearable.CST-mechanical,hydraulic,electroniccontrol,cooling,materialsforintegrated,manufacturing,high-precisioncontrol,supplyofsparepartsinparticularinconvenience.Scraperconveyorismovingequipment,changingworkenvironment,theextremelybadconditions,equipmentfailureratecorrespondinglyincreased,thegreaterdifficultyofmaintainingthehigheroperatingcostsandnarrowworkspaceconstraintsoftheCSTinChinamineAFCMachineapplications.Frequencysoft-startmode.Scraperconveyorused,itsperformanceadvantagesnotplay;expensive,thegeneralmineunbearable;componentsuseditspowerIGBTmodules,high-voltageIGBTmoduleoftheinternationalembargoonChina,soitsdifficulttovoltagelevelsTo1140V,toitscoalmineconveyorontheapplicationhasbroughtgreatdifficulties.SRM-drivenapproach.SRMisanewdriver,inothersectors（suchasthetextileindustry,machinerymanufacturing,washingmachines,etc.）haveaverywiderangeofapplications.Themainfeatureisactivatedwhenthecurrentlowtorque,speedperformance,andeasytousepureelectriccontroltoachievesteplessspeedregulation,andlongrun.MotorexclusiveuseofSRM,butflow,notburningmotor,withgoodprospectsfordevelopment.ComponentsusedforpowerIGBTmodule,itisverydifficulttoachievevoltage1140V.Thecurrenthigh-powerexplosionSRMisstillinthe刮板輸送機外文翻譯文獻developmentstage,thebulksmaller,highercost,notsuitablefortheundergroundminescrapeapprlicatciono.nveyorsoft-startmode.Taiyuan,thecompanydevelopedtheWhitbysoftstart-FM-speedtechnology,speedregulatortechnology,vacuumtechnologyformagneticstartone,startwiththecharacteristicsofanalogFM.Thesurgestartedwiththewaythesoftstart-voltageslopestart,currentfeedbacksuddenjumpstartandstartcomparedtotheinitialstartmoretorque,canachievethelow-speedtorqueactivatedtoensurethatequipmentfromthetake-up,byStatictodynamicstartrunning,youcansolvetheproblemofoverloadingdifficultstart.三、applicationPingdingshanCoalMiningGroupafteranalysisandcomparison,inOctober2004quoteda2-QJT250/1140(660)softstart,andZhangjiakouCoalFactoryproductionSGZ-764/400-scraperconveyorsupport,insteadoftheoriginalTherestrictionsstartfillinghydrauliccoupler,inasmallmining6-31080fullymechanizedcoalfaceapplications,isnowrunningforsixmonths,anditssoft-startcontrolofthescraperconveyorincidentdoesnotappear,better-performing.Thestarterthefollowingkeyfeatures:①andhydrauliccoupler,comparedwithtwo-speedmotor,scraperconveyordrivesystemandpowersupplysystemtomaximizethesimplified,thereliabilityofthesystem刮板輸送機外文翻譯文獻刮板輸送機外文翻譯文獻significantlyincreased.②starttheprocessof,5spowertoblockprotection.③starttheprocessofautomaticmeasurementload,automaticallydeterminesuddenjumpstart,thecommencementofthebiggestobstacles,thelargestmotortorque,thebuckstartedtoovercometheshortcomings.④thestarterall-digitalcontrolcircuit,issetuptofacilitatetheactualstartingcurrentcanbeaccuratelycontrolledinthefollowing4Ie,thecurrentsmallmotorlaunch,reducetheimpactofthepowergrid.⑤scraperconveyorloadedwithemptyandasmoothstarttomaximizetheEliminationofTransmissionofthefixed-load,effectivelypreventingtheDuanlian,breakpoints,rollerkeytransmissioncomponents,suchasdamagetotheaccident.⑥VVVFsoftstartwithafuzzycontroltechnology,basedonloadautomaticallydeterminethesizeofstart-uptime.Loadlarge,extendedstart-uptime,reducetheequipmentdynamicimpactloadhours,becauseofthedynamicimpactoftheequipmentsmaller,thesystemautomaticallyreducethestart-uptime,canreducetheimpactofthemotorlife.Minetransportationequipment,longworkinghours(16~18h/d),alargenumbercomplexsystem,supportingequipment,supportinglinks,deliveryofmaterialsbyblock,theimpactofwaste,launchedfrequentlaunchaccidents.Fully-ffaaicleiunrteheelectricalandmechanicalequipment,scraperconveyorfailuresaccountedforabout40percent.Inlightoftheabovereasons,andbecauseofsoft-startthedevelopmentoffullymechanizedcoalfacescraperconveyorlaunchcontrolfortechnicalimprovementsisnotonlynecessarybutalsofeasible.SCRMinescraperconveyorsoft-startisthehighyieldandhighefficiencyfullymechanizedcoalfaceoftheimportanttechnologyandequipment,withgreatapplicationvalue.Theproject'ssuccessfulapplicationtoreducethefullymechanizedcoalfacemechanicalandelectricalaccidents,improveyieldandreduceconsumptionisofgreatsignificance.翻譯:礦用刮板輸送機軟啟動方式的選擇與應(yīng)用在煤礦高產(chǎn)高效綜采工作面的建設(shè)中,以工作面大采長、大走向的要求配套了大功率的采煤機和刮板輸送機。普通綜采工作面的采長一般在左右刮板輸送機的運輸能力左右而高產(chǎn)高效綜采工作面的采長一般達到?刮板輸送機的運輸能力達以上因此輸送機功率增長較大。以平煤集團公司為例,刮板輸送機的功率大都在X以上最大的為X。刮板輸送機的啟動以雙速啟動為主,少數(shù)采用限矩型液力耦合器,這2種啟動方式,不僅運行費用高,而且停機率高。因此,需尋求新的技術(shù)和裝備來滿足高產(chǎn)高效的要求。一、目前現(xiàn)狀及存在的問題（一）限矩型液力耦合器在大功率、大負(fù)荷時,本身體積龐大,當(dāng)它與電動機和減速機聯(lián)接后,所占空間更大。在工作空間受到限制的場合,過大的體積會使刮板輸送機的布置變得困難。液力耦合器增大了傳動距離,并且在高速狀態(tài)旋轉(zhuǎn),易產(chǎn)生較大的徑向動負(fù)荷沖擊,而造成電動機和減速裝置的損壞。耦合器的輸出轉(zhuǎn)速與輸入轉(zhuǎn)速之比通常不高于97即%,無法實現(xiàn)輸入軸和輸出軸的同步,因而必然存在較大的功率損失,降低了傳動系統(tǒng)的效率。（二）雙速電動機驅(qū)動系統(tǒng)目前在我國礦用刮板輸送機中普遍采用。通常情況下,電動機以額定轉(zhuǎn)速的一半啟動,相應(yīng)地啟動功率也是電動機額定功率的一半。電動機以低速啟動,當(dāng)完成啟動過程后再切換到高速運轉(zhuǎn),從啟動到正常運轉(zhuǎn)分兩級進行,部分地減小了啟動沖擊。這種方式要使用專門的雙繞組電動機、雙根電纜和雙速開關(guān)。雙速電動機結(jié)構(gòu)復(fù)雜,造價高,供電系統(tǒng)相當(dāng)于2臺電動機,低速切換不易有效控制,故障點多,刮板輸送機外文翻譯文獻經(jīng)常出現(xiàn)啟動失敗。隨著綜采工作面的推進要不斷地移動設(shè)備和電纜增大了設(shè)備電纜移動的難度,同時,電纜的故障也會成倍的增加。二、幾種先進軟啟動方式的對比（一）晶閘管調(diào)壓軟啟動方式。啟動過程分斜坡啟動、脈沖突跳啟動、加速斜坡、快速斜坡。脈沖突跳啟動方式可以短時輸出最大達95的%額定電壓,施加一個短時的大啟動力矩（相當(dāng)于90直%接啟動轉(zhuǎn)矩）,以克服大的靜摩擦力和大的傳動系統(tǒng)慣性。這種軟啟動方式應(yīng)用前景廣闊。二液體粘性傳動軟啟動方式。典型的是美國公司連續(xù)啟動傳動軟啟動裝置。軟啟動裝置目前主要依賴進口其價格昂貴一般礦井難以承受。集機械、液壓、電子控制、冷卻、材料為一體制造、控制精度高,備件供應(yīng)特別不便。刮板輸送機是移動設(shè)備,工作環(huán)境不斷變化,條件極為惡劣,設(shè)備故障率相應(yīng)增大,較大的維護難度、較高的運行成本和狹窄的工作空間限制了在我國礦用刮板輸送機上的應(yīng)用。（三）變頻軟啟動方式。應(yīng)用于刮板輸送機上,其性能優(yōu)勢得不到發(fā)揮價格昂貴一般礦井難以承受其功率元件采用模塊高電壓等級的模塊在國際上對我國禁運所以其電壓等級很難達到給其在煤礦井下輸送機上的應(yīng)用帶來了很大的困難。（四）開關(guān)磁阻電動機驅(qū)動方式。開關(guān)磁阻電動機是一種新的驅(qū)動方式在目前在其他行業(yè)（如紡織工業(yè)、機械制造業(yè)、洗衣機等）有著十分廣泛的應(yīng)用。主要特點是啟動時低電流大轉(zhuǎn)矩在調(diào)速性能好在容易用純電氣控制實現(xiàn)無級調(diào)速在并可長時間運行。電動機采用專用開關(guān)磁阻電動機在不過流不易燒毀電動機具有良好的發(fā)展前景。因功率元件采用模塊電壓等級很難