1、翻译部分英文原文AbstractInthispaper/theexperimentalresultsofa45-kWand15-troadheaderexcavatingagallerywithtwodifferenttypesofrockatthefaceusingtwodifferentcuttingheadsareshown/Itisprovedthattheroadheaderworksproperlywithbothcuttingheads/Incomparisonwithotherresultsintheliterature/theprincipalparameters/i/e/s
2、pecificenergy/cuttingrateandtoolwear/areatalevelthatcanbeconsideredsatisfactorytakingintoaccountthelowpoweroftheroadheader/Ontheotherhand/theinfluenceofthenumberofpicks/whichisthemaindifferencebetweenthetwocuttingheads/ontheoperationalparametersisshown/2003ElsevierScienceLtd/Allrightsreserved/Keywor
3、ds/Roadheaders；Cuttingheaddesign；Specificcuttingenergy；Cuttingrate；Toolwear1/Introduction/experienceinusingofroadheadersinamineThecoalbasinintheNWofSpain(Arecesetal//1994)formsasynclineinwhichthecoalseamsaremoderatelyinclined(30358)attheNWfoldaxisandalmostvertical(70908)attheSEfoldaxis/Carboniferous
4、materialoccursunderaflatPermianoverburden/150mthick/Theuseofroadheadersinthisminewasaconsequenceofmechanisationofthework/Coalminingbythelong-wallmethodwithpoweredroofsupportsmakesrapidadvanceoftheaccessroadsnecessary/Ontheotherhand/thetwoalternativesforminingverythickcoalseams/i/e/room-and-pillarinf
5、latseamsandsublevelcavinginverticalseams/alsomakestheuseofroadheaderdrivinggalleriesinthecoalseamsnecessarySeveraltypesofroadheadersareusedinthemineforthesedifferentworks/a/Oneroadheader(Fig/1)of60tinweight/witha250-kWrippingcuttinghead/especiallydesignedforthistypeofmineinthecontextofresearchprojec
6、t(Anon//1991；Toranoetal//1992；Torano/1994)withtheobjectiveofdrivinggalleriesof10-mcross-2sectionsincoalseamsof1/01/5minthickness(withapprox/50%ofthesectioninhardrockofuniaxialcompressivestrengthuptosc120MPa)；b/Tworoadheaders(Fig/2)of24tinweight/witha110-kWrippingcuttingheadmainlyusedindrivinggalleri
7、eswithmediumhardrock(c60MPa)orincroom-and-pillarmining；c/Tworoadheaders(Fig/3)of12/5tinweightwithamillingcuttingheadof45kW/onlyusedinadvancingofgalleriesincoal(softrock)；theconveyortypemeanstheroadheaderhasa2/8-mwidthandbecauseofthisitcanonlybeusedforadvancinggalleriesincoalseamsof3/0minthickness(ma
8、inlyintheminingmethodtermedsublevelcaving)；andd/Oneroadheader(Fig/4)of15/5tinweightwitha45-kWmilling-typecuttinghead/developedwiththisnarrowdesignespeciallyforthismine(Toranoetal//1997)foritsapplicationindrivinggalleriesin2/0-m-thickcoalseams(minimum1/70m)inwhichpreviousroadheaderscouldnotbeused/The
9、studydescribedherewascarriedoutinthecontextofthisproject/Duringtheadvanceofgalleriesin2/0-m-thickcoalseams/itwassometimesnecessarytoexcavatetherockoftheseamwalls/thestrengthofwhichwasalmostoverthelimitofthecuttingcapacityoftheroadheader/Itwasdecidedtoinvestigateif/undertheseconditions/theoperationor
10、cuttingparameterswereacceptableusingtwodifferentcuttingheadsinthetest/2/Testdescription2/1/TestobjectivesTheaimwastodeterminethepossibilityofdrivingthesegalleriesbymeansofa45-kWroadheader/comparingtwodifferentcuttingheadsexcavatingthesametypeofrockinsimilaroperatingcycles/Themaindifferencebetweenthe
11、twocuttingheadswasthenumberofpicks/thefirstcuttingheadhad36picks/whilethenewonehadonly24(Fig/5)/Becauseofthelowernumberofcuttingtoolsincontactwiththerock/thetorquetransmittedbythemotorwastransformedtoalargertangentialforceinthepick/whichallowshigher-strengthrocktobecut/Stressconcentrationisthemajorf
12、actorinrockfragmentation/Theparameterstomeasure(accordingtoclassicstudiesonthistheme；FowellandMcFeat-Smith/1976；Gehring/1989)arethecuttingrate(volumeofrockexcavatedpertimeunitinm3/s)/specificenergy(ener-3gynecessarytoexcavateaunitofvolumeinMJ/m3)3andthetoolwearorspecificpickconsumption(picksorpickmasslostexcavatingaunitofvolumeofrockinpicks/m3org/m3)/Allparametersweremeasured33whentheroadheaderwasexcavatingcoalandrock/aswellaswhenitwasperformingotherpartsofthecycle/
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