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外文翻译--采煤机.doc

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外文翻译--采煤机.doc

中国矿业大学2008届本科生毕业设计第1页英文原文THESHEARERSHEARERLONGWALLEQUIPMENTCONSISTSOFTHREEMAJORCOMPONENTSTHEHYDRAULICALLYPOWEREDROOFSUPPORT,THECHAINCONVEYOR,ANDTHECOALCUTTINGMACHINETHETWODIFFERENTTYPESOFCOALCUTTINGEQUIPMENTUSEDINCOALMINESARESHEARERSANDPLOWSPLOWSAREUSEDINLOWSEAMS,42INORLESSTHEUNITCONSISTSOFSTEELCONSTRUCTIONEQUIPPEDWITHCARBONTIPPEDBITSTHISPASSIVESTEELUNITISENGAGEDTOAGUIDINGSYSTEMONTHEFACECONVEYORANENDLESSROUNDLINKCHAINPOWEREDBYSYNCHRONIZEDELECTRICDRIVESONEACHENDOFTHEFACECONVEYORPULLSTHEPLOWBODYATSPEEDSBETWEEN120AND420FT/MINALONGTHEFACEFORTHECUTTINGPROCESSTHEPLOWHASTOBEFORCEDAGAINSTTHECOALFACETHISISDONEBYHYDRAULICCYLINDERATTACHEDTOTHEGOBSIDEOFTHEFACECONVEYORANDTOTHEBASEOFTHESUPPORTS,ORBYASEPARATEHYDRAULICPROPFORCESOFBETWEEN1AND3TONSAREAPPLIEDPERCYLINDERAPLOWDRIVEISATTACHEDTOEACHDRIVEFRAMEOFTHEFACECONVEYORONLY30TO60OFTHEDRIVEPOWERSUPPLIEDTOTHEPLOWISUSEDFORCUTTINGANDLOADINGOFCOAL;THEREMAINDERISLOSTINFRICTIONTHISMEANSTHATTHEPOWERLOSSISCONSIDERABLYHIGHERTHANTHATOFASHEARER,WHICHUSES75TO85OFITSPOWERFORTHEREMOVALOFTHECOALASARESULT,RATHERLARGEDRIVESAREREQUIREDATTHEFACEENDSALTHOUGHTHEREAREMANYMODELS,THESHEARERHASSEVERALCOMMONBASICCOMPONENTSADOUBLEENDEDRANGINGDRUMSHEARERFIG81,FOREXAMPLE,CONSISTSOFFOURMAJORCOMPONENTSELECTRICMOTORS,GEARHEADS,HAULAGEUNITPOWERPACK,ANDCUTTINGDRUMS中国矿业大学2008届本科生毕业设计第2页THEELECTRICMOTORRANGINGFROM300TO1000HORSEPOWER223750KWISTHEPOWERSOURCEFORTHESHEARERITPROVIDESPOWERTORUNTHEHYDRAULICPUMPSINTHEHAULAGEUNITANDTHEGEARHEADSFORTHECUTTINGDRUMTHELARGECAPACITYSHEARERSAREGENERALLYEQUIPPEDWITHTWOELECTRICMOTORSONEFORTHEHAULAGEUNITANDONEGEARHEADANDTHEOTHERFORTHEOTHERGEARHEADANDOTHERANCILLARYEQUIPMENTTHEMOTORSCANBEREMOTELYCONTROLLEDTHEREARETWOGEARHEADS,ONEONTHELEFTHANDTHEOTHERONTHERIGHTHANDSIDEOFTHESHEAREREACHGEARHERADCONSISTSOFAGEARHEADGEARBOXANDARANGINGARMTHECUTTINGDRUMISLACEDWITHSPIRALVANESONWITHSPIRALVANESONWHICHTHECUTTINGBITSAREMOUNTEDITSDIAMETERRANGESFROM34TO72IN086183MWITHROTATIONALSPEEDSFROM30TO105RPMTHETRENDSARETOWARDFEWERBUTLARGERBITSANDSLOWERDRUMSPEEDFORBETTERCUTTINGEFFICIENCYANDLESSCOALDUSTPRODUCTIONTHEDRUMSAREALSOEQUIPPEDWITHPOWERCOWLSTOINCREASETHECOALLOADINGEFFICIENCYTHEPOWERCOWLISUSUALLYLOCATEDBEHINDTHECUTTINGDRUMFORTHATREASON,ITCANBEROTATEDAFULL180THEELECTRICMOTOR,HAULAGEUNIT,ANDGEARHEADBOXESCOMBINETOFORMTHESHEARER’SBODYWHICHISMOUNTEDONTHEUNDERFRAMETHEUNDERFRAMEHASFOURSLIDINGSHOESTHEFACESIDESHOESAREFITTEDANDRIDEONTHEFACESIDETOPGUIDEOFTHEFACECONVEYORPAN,ANDTHEOTHERTWOGOBSIDESLIDINGSHOESAREFITTEDONAGUIDETUBETOPREVENTDERAILMENTTHETRAMMINGAPEDOFTHESHEARERRANGESFROM19TO46FT/MIN58140M/MININADDITION,THESHEARERISEQUIPPEDWITHAUXILIARYHYDRAULICPUMPSANDCONTROLVALVESFOROPERATINGTHERANGINGARMSANDPOWERCOWLS,WATERSPRAYING中国矿业大学2008届本科生毕业设计第3页DEVICES,CABLE,CHAINANCHORAGEANDTENSIONERS,ANDSOONINSELECTINGTHESHEARER,MININGHEIGHTSHOULDFIRSTBECONSIDERED;THATIS,THEDIAMETEROFTHECUTTINGDRUM,BODYHEIGHT,LENGTHOFTHERANGINGARM,ANDSWINGANGLEMUSTBEPROPERLYSELECTEDFORTHEDOUBLEENDEDRANGINGDRUMSHEARER,THEMAXIMUMMININGHEIGHTCANNOTEXCEEDTWICETHEDIAMETEROFTHECUTTINGDRUMTHEMININGHEIGHTCANBEDETERMINEDBYFIG83HHBB/2LSINΑD/2WHEREHSEAMTHICKNESSORMININGHEIGHTHBSHEARER’SBODYHEIGHTBBODYDEPTHLLENGTHOFTHERANGINGARMΑTHEANGLEBETWEENTHERANGINGARMANDTHEHORIZONTALLINEWHENTHERANGINGARMISRAISEDTOITSMAXIMUMHEIGHTDDIAMETEROFTHECUTTINGDRUMFOREXAMPLE,FORTHEEICHHOFFEDW170LDOUBLERANGINGDRUMSHEARER,HB43FT,L390FT,Α52,ANDD53FTITSMAXIMUMCUTTINGHEIGHTISH92FTTYPESOFMODERNSHEARERSSINCEITSFIRSTAPPEARANCEIN1954,THESHEARERHASUNDERGONECONTINUOUSCHANGESBOTHINCAPABILITYANDSTRUCTUREITISNOWTHEMAJORCUTTINGMACHINEINLONGWALLCOALFACESTHEREARETWOTYPESOFSHEARERS,SINGLEANDDOUBLEDRUMINTHEEARLIERMODELS,THEDRUMINTHESINGLEDRUMSHEARERISMOUNTEDONTHESHEARER’SBODYANDCANNOTBEADJUSTEDFORHEIGHTTHEREFOREITISNOTSUITABLEFORAREASWHERETHEREARECONSTANTCHANGESINSEAMTHICKNESSANDFLOORUNDULATIONTHUSTHESINGLEENDEDFIXEDDRUMSHEARERISUSEDMOSTLYFORTHINSEAMS中国矿业大学2008届本科生毕业设计第4页FIGURE610SHOWSASINGLEDRUMSHEARERWITHARANGINGARMTHECUTTINGDRUMISMOUNTEDATTHEVERYENDOFTHERANGINGARMTHERANGINGARMCANBERAISEDUPANDDOWNBYHYDRAULICCONTROLTOACCOMMODATETHECHANGINGSEAMTHICKNESSANDFLOORUNDULATIONBUTWHENTHESEAMEXCEEDSACERTAINTHICKNESS,THESINGLEDRUMSHEARERCANNOTCUTTHEENTIRESEAMHEIGHTINONECUTANDARETURNCUTTINGTRIPISNECESSARYTOCOMPLETEAFULLWEBCUTFURTHERMORE,SINCETHEDRUMISLOCATEDONTHEHEADENTRYSIDE,ITGENERALLYREQUIRESANICHEINTHETAILENTRYSIDEANICHEISAPRECUTFACEEND,ONEWEBDEEPANDASHEARER’SLENGTHLONGWITHANICHEATTHEFACEENDTHESHEARERCANTURNAROUNDNOWADAYS,THEDOUBLERANGINGDRUMSHEARERSAREUSEDPREDOMINANTLYTHESHEARERCUTSTHEWHOLESEAMHEIGHTINONETRIPTHETWODRUMSCANBEPOSITIONEDTOANYREQUIREDHEIGHTWITHINTHEDESIGNEDRANGEDURINGCUTTINGANDLOWEREDWELLBELOWTHEFLOORLEVELTHEARRANGEMENTOFTHEDRUMSENABLESTHEWHOLESEAMTOBECUTINEITHERDIRECTIONOFTRAVEL,THEREBYENSURINGRAPIDFACEADVANCEANDSHORTENINGROOFEXPOSURETIMETHEREAREVARIOUSTYPESOFDOUBLERANGINGDRUMSHEARERSBASEDONTHELOCATIONOFTHEDRUMS,THEREARETWOTYPESONEWITHONEDRUMMOUNTEDONEACHSIDEOFTHESHEARER’SBODYANDTHEOTHERWITHBOTHDRUMSMOUNTEDONONESIDEOFTHEMACHINETHEFORMERTYPEISTHEMOSTWIDELYUSEDITSADVANTAGEISTHATWITHONEDRUMONEACHSIDEOFTHESHEARER,ITCANSUMPINEITHERDIRECTIONDURINGTHECUTTINGTRIP,THELEADINGDRUMCUTSTHEUPPER70OFTHESEAMHEIGHTWHILETHEREARDRUMCUTSTHELOWER30ANDCLEANSUPTHEBROKENCOALONTHEFLOORTHETWODRUMSAREAPPROXIMATELY2333FT710MAPARTWHENTHESHEARERISTRAVELINGINTHEOPPOSITEDIRECTIONTOTHATOFTHEFACECONVEYOR,THECOALCUTBYTHELEADINGDRUMHASTOPASSUNDERTHESHEARER’SBODY,WHICHINCREASESTHEMOVINGRESISTANCEOFTHESHEARERANDTHEFACECONVEYORANDCOULDCAUSEA“CROWDING”CONDITIONIFTHEBROKENCOALISTOOLARGE,ITMAYBLOCKTHESHEARERANDSTOPTHEOPERATIONINGENERAL,WHENTHESHEARERANDTHEFACECONVEYORARETRAVELINGINTHEOPPOSITEDIRECTIONS,APPROXIMATELY70OFTHECOALTAKENBYTHELEADINGDRUMWILLPASSUNDERTHESHEARERBUTWHENTHEYARETRAVELINGINTHESAMEDIRECTION,THECOALTAKENDOWNBYTHEREARDRUMTOGETHERWITHTHEFLOATCOALFROMTHEFLOORCONSTITUTETHEAPPROXIMATELY30OFTHECOALTHATHASTOPASSUNDERTHESHEARERTHEFORMERCASECONSUMES25MOREPOWERTHANTHELATTERASCOMPAREDTOTHESINGLEENDEDSHEARER,THEUNDERFRAMEOFTHEDOUBLEENDEDSHEARERISHIGHER,THEREBYENSURINGASUFFICIENTCROSSSECTIONFOR

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