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1、惶穹呶锷垤岛噢辊插庐英文原文勉婚蔺硐强颥顺崩硷馈Self-advancinghydraulicpoweredsupport廑景署崃磁髟硌蓖裢踮Modernlongwallminingemployshydraulicpoweredsupportsatthefacearea.Thesupportsnotonlyholdsuptheroof,pushesthefacechainconveyor,andadvancesitself,butalsoprovidesasafeenvironmentforallasso
2、ciatedminingactivities.Thereforeitssuccessfulselectionandapplicationaretheprerequisiteforsuccessfullongwallmining.Furthermore,duetothelargenumberofunitsrequired,thecapitalinvestedforthepowersupportusuallyaccountsformorethanhalfoftheinitialcapitalforalongw
3、allface.Thereforebothfromtechnicalandeconomicpointsofview,thepoweredsupportisaveryimportantpieceofequipmentinalongwallface.剀坤喱钤萄拌赴辆鲁膨Theapplicationofmodernpoweredsupportscanbetracedbacktoearly1950’s.Sincethen,followingitsadoptionineverypartoftheworld,ther
4、ehavebeencountlessmodelsdesignandmanufacturedinvariouscountries.Butunfortunately,therestillisnouniformsystemofclassification.忙瓠竣嘶瘟迹蜡总哿锬Asimplifiedclassificationisusedinthissection.Sinceapoweredsupportconsistsoffourmajorcomponents(i.e.,canopy,cavingshield,
5、hydrauliclegsandprops,andbaseplate),thewaysbywhichtheyareinterrelatedareusedforclassification.Inthisrespect,twofactorsaremostimportant:(1)presenceorabsenceofcavingshield-ifacavingshieldisincluded,thesupportisa“shield”type,otherwise,aframeorachock;(2)numbe
6、randtypeofarrangingthehydrauliclegs-sincesupportcapacityisgenerallyproportionaltonumberofhydrauliclegs,itisimportanttospecifythenumberofhydrauliclegsthatasupporthas.Furthermore,thewaythehydrauliclegsareinstalledisimportant;forexample,averticalinstallation
7、betweenthebaseandthecanopyhasthecavingshieldhastheleastefficiencyinsupportingtheroof.檑井翠沭鬲冥恻恋撤碧Basedonthisconcept,therearefourtypesofpoweredsupport,thatis,theframe,chock,shieldandchockshield,inorderofevolutionoftheirdevelopment.However,itmustbenotedthatth
8、etrendofdevelopmentineachtypeissuchthatitbecomeslessdistinguishableintermsofapplication.霜伪琵螓嵩樯揉恕耗货Thefourtypesofroofsupportscanbeobtainedforeitherlongwallretreatingoradvancingsystems,andtheyareavailableinstandard,on
