煤矿英语-长臂开采技术

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1、7-1ClassificationofLongwallMiningTechniques[1]Longwallminingtechniques,Inaccordancewiththeproductioncapacities[2]andthetechnico-economicconditions,canusuallybeclassifiedintothreetypes.A.Thedrillingandblastingmining[31：itistheoldestminingtechnique・Nowadays,thetechniqueandequipmentofdril

2、lingandblastingmininghasbeenimproved.Thethreekindsofnewtechniques,themillisecondblasting[4],theindividualhydraulicprops[5]andthelargepowerchineconveyors,havebeenspreadedandappliedinthedrillingandblastingfaces・B.Themechanizedmining[6]:themechanizedminingcharacterizedbyusingtheshearerorp

3、low[7],integrallyremovablechainconveyorandhydraulicprops.C.Thefullymechanizedmining[8]:thefullymechanizedminingfaceconsistsofshearerorplow,armoredfaceconveyor(AFC)[9],poweredsupports,andstageloader[10]andbeltconveyor[11]intheheadentry.7-2TheOperatedProceduresinaFullyMechanizedFaceCoala

4、tIongwallfaceiscutbyeitherashearerloaderoraplow•Theshearerloadersgenerallyrideonthepanline[12]ofanarmoredfaceconveyer(AFC),whichislaidonthefloorparalleltothefaceline[13].Theshearerloadermovesbymeansofaself-containedmotorizedwinch[14Jrunningalongastaticchainwhoseendsareanchoredattheends

5、ofthefacenearoratthedriveunitsoftheAFC・Intherecentmodels,theshearerloadersareself-propelledalongaspecialtrackwithouttheaidofthechain.ThustheAFCservesasthetrackforthecuttingmachinetomoveonandasaguidetoholdthemachineinplace.Singleordoubledrumssimilarinsomerespecttothoseusedincontinuousmi

6、nersbutlargerindiameteraremountedonthefacesideoftheshearerloader.Thecuttingpositionofadrumcanbefixedorhydraulicallyadjustedbytherangingarms.Thecuttingforce[15]isprovidedbytherotatingtorqueavailableattheaxisofthedrum・Thewidthsofcutsorwebsmadebyshearerloadersareabout20-36in.(0・50-0・91m)w

7、ide・AplowisgenerallymountedonthefacesideoftheAFCandpulledbyacontinuouschainenclosedinaspecialguidechannel[16]oneitherthefacesideorthegobsideofthearmoredfaceconveyor.Thecontinuouschainsispoweredbytwodriveunitslocatedatbothendsoftheface.Thecuttingforceisprovidedbythecontinuouschainthat