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外文翻译--小动力掘进机在不同岩石面挖掘隧道的实验结果.doc

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外文翻译--小动力掘进机在不同岩石面挖掘隧道的实验结果.doc

翻译部分英文原文AbstractInthispaper,theexperimentalresultsofa45kWand15troadheaderexcavatingagallerywithtwodifferenttypesofrockatthefaceusingtwodifferentcuttingheadsareshown.Itisprovedthattheroadheaderworksproperlywithbothcuttingheads.Incomparisonwithotherresultsintheliterature,theprincipalparameters,i.e.specificenergy,cuttingrateandtoolwear,areatalevelthatcanbeconsideredsatisfactorytakingintoaccountthelowpoweroftheroadheader.Ontheotherhand,theinfluenceofthenumberofpicks,whichisthemaindifferencebetweenthetwocuttingheads,ontheoperationalparametersisshown.2003ElsevierScienceLtd.Allrightsreserved.KeywordsRoadheadersCuttingheaddesignSpecificcuttingenergyCuttingrateToolwear1.IntroductionexperienceinusingofroadheadersinamineThecoalbasinintheNWofSpainArecesetal.,1994formsasynclineinwhichthecoalseamsaremoderatelyinclined30–358attheNWfoldaxisandalmostvertical70–908attheSEfoldaxis.CarboniferousmaterialoccursunderaflatPermianoverburden,150mthick.Theuseofroadheadersinthisminewasaconsequenceofmechanisationofthework.Coalminingbythelongwallmethodwithpoweredroofsupportsmakesrapidadvanceoftheaccessroadsnecessary.Ontheotherhand,thetwoalternativesforminingverythickcoalseams,i.e.roomandpillarinflatseamsandsublevelcavinginverticalseams,alsomakestheuseofroadheaderdrivinggalleriesinthecoalseamsnecessarySeveraltypesofroadheadersareusedinthemineforthesedifferentworksa.OneroadheaderFig.1of60tinweight,witha250kWrippingcuttinghead,especiallydesignedforthistypeofmineinthecontextofresearchprojectAnon.,1991Toranoetal.,1992Torano,1994withtheobjectiveofdrivinggalleriesof10mcross2sectionsincoalseamsof1.0–1.5minthicknesswithapprox.50ofthesectioninhardrockofuniaxialcompressivestrengthuptosσc≈120MPab.TworoadheadersFig.2of24tinweight,witha110kWrippingcuttingheadmainlyusedindrivinggallerieswithmediumhardrockσc≤60MPaorincroomandpillarminingc.TworoadheadersFig.3of12.5tinweightwithamillingcuttingheadof45kW,onlyusedinadvancingofgalleriesincoalsoftrocktheconveyortypemeanstheroadheaderhasa2.8mwidthandbecauseofthisitcanonlybeusedforadvancinggalleriesincoalseamsof3.0minthicknessmainlyintheminingmethodtermedsublevelcavingandd.OneroadheaderFig.4of15.5tinweightwitha45kWmillingtypecuttinghead,developedwiththisnarrowdesignespeciallyforthismineToranoetal.,1997foritsapplicationindrivinggalleriesin2.0mthickcoalseamsminimum1.70minwhichpreviousroadheaderscouldnotbeused.Thestudydescribedherewascarriedoutinthecontextofthisproject.Duringtheadvanceofgalleriesin2.0mthickcoalseams,itwassometimesnecessarytoexcavatetherockoftheseamwalls,thestrengthofwhichwasalmostoverthelimitofthecuttingcapacityoftheroadheader.Itwasdecidedtoinvestigateif,undertheseconditions,theoperationorcuttingparameterswereacceptableusingtwodifferentcuttingheadsinthetest.2.Testdescription2.1.TestobjectivesTheaimwastodeterminethepossibilityofdrivingthesegalleriesbymeansofa45kWroadheader,comparingtwodifferentcuttingheadsexcavatingthesametypeofrockinsimilaroperatingcycles.Themaindifferencebetweenthetwocuttingheadswasthenumberofpicksthefirstcuttingheadhad36picks,whilethenewonehadonly24Fig.5.Becauseofthelowernumberofcuttingtoolsincontactwiththerock,thetorquetransmittedbythemotorwastransformedtoalargertangentialforceinthepick,whichallowshigherstrengthrocktobecut.Stressconcentrationisthemajorfactorinrockfragmentation.TheparameterstomeasureaccordingtoclassicstudiesonthisthemeFowellandMcFeatSmith,1976Gehring,1989arethecuttingratevolumeofrockexcavatedpertimeunitinm3/s,specificenergyener3gynecessarytoexcavateaunitofvolumeinMJ/m33andthetoolwearorspecificpickconsumptionpicksorpickmasslostexcavatingaunitofvolumeofrockinpicks/m3org/m3.Allparametersweremeasured33whentheroadheaderwasexcavatingcoalandrock,aswellaswhenitwasperformingotherpartsofthecycle.

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