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外文翻译--混凝土喷射机的概述及改进.doc

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外文翻译--混凝土喷射机的概述及改进.doc

SUMMARIZATIONANDIMPROVEMENTOFCONCRETEEJECTINGMACHINESFANHUAQIULINFENGCHENLINGFANGABSTRACTTHETEXTINTRODUCESTHEPRINCIPLE,STYLEANDDEVELOPMENTPROCESSOFDRYANDWETTYPECONCRETEEJECTINGMACHINESITANALYZESDOMESTICANDFOREIGNAPPLICATIONINSTANCE,ALLKINDSOFCONCRETEEJECTINGMACHINESMOSTLYMERITANDFLAWALSOITINTRODUCESSOMEREPRESENTATIONALWETCONCRETEEJECTINGMACHINESDOMESTICDEVELOPEDSOMEFLAWSOFCONCRETEEJECTINGMACHINESAREIMPROVEDKEYWORDSCONCRETEEJECTINGMACHINES,FRAMECHARACTERISTIC,OPERATINGPRINCIPLES,HIGHWAYCONCRETEISTHEUSEOFCOMPRESSEDAIRJET,WILLBEALLOCATEDACERTAINLEVELANDGOODWATERCEMENTRATIOMIXINGCONCRETEMATERIALS,THROUGHTHEPIPELINEBYTHEJETNOZZLE,ANDHIGHSPEEDJETOUTTOTHESURFACEBYSPRAYINGACONCRETESUPPORTLAYERISSPRAYEDCONCRETECONSTRUCTIONEQUIPMENTOPERATIONSINTHEMAINASACONCRETESPRAYINGTECHNOLOGYSAVINGCONCRETEANDSTEEL,TIMBER,LABOURSAVINGANDIMPROVECONSTRUCTIONEFFICIENCYANDREDUCECOSTS,ANDOTHERCHARACTERISTICS,THECONCRETEAPPLICANOFTHEJETINCREASINGLYCOMMONHASNOWBEENWIDELYUSEDINRAILWAY,HIGHWAY,WATERCONSERVANCY,CONSTRUCTION,COALANDOTHERBUILDINGWORKSINCONSTRUCTION,ATUNNELSOLUTION,ROADSLOPE,CONSTRUCTIONPIT,UNDERGROUNDWORKSOFTEMPORARYANDPERMANENTCARETOSUPPORTTHECONSTRUCTIONMACHINERYOPERATIONS11THEWORKOFSPRAYEDCONCRETEMECHANISMANDTHEDEVELOPMENTTRENDINSPRAYEDCONCRETEOPERATIONS,THEOVERWHELMINGMAJORITYOFTHEUSEOFCONCRETEROTORAIRCRAFT,SUCHASJETSTRUCTUREISSIMPLE,RELIABLEPERFORMANCE,ASMALL,LIGHTWEIGHT,EASYTOOPERATEANDMAINTENANCE。DRYJETPRINCIPLEANDSTRUCTUREARETHEROTORWITHALINERTOACERTAINSPEEDOFROTATION,ANDTHECOMBINATIONOFPRESSUREPLATESFIXEDONTHELINERFIXED,WITHABOARDCONNECTEDINTOTHEWINDPIPEANDDISCHARGINGELBOW,WHENROTOREQUIPPEDWITHMATERIALSINTHEVARIOUSMATERIALSCUPROTATIONANDINTOTHEWINDTOTHEELBOWANDDISCHARGINGTHESAMETIME,INTHEROLEOFGASUNDERPRESSURE,ANDMATERIALSTHROUGHTHEELBOWANDEXPECTEDTOLOSETHEMATERIALTRANSPORTEDTOTHENOZZLEANDNOZZLEINTHEWATERBLASTINGAWAYDRYCONCRETEJETOFTHEMAINADVANTAGESISALONGDISTANCECARRIER,SIMPLEEQUIPMENT,DURABLE,BUTBECAUSEITISSODRYNOZZLES,MIXINGCONCRETEMIXEDWITHWATER,ANDTHEREFORETHECONSTRUCTIONDUST,AREMORERESILIENT,DRYSPRAYINGOPERATIONSAGAINSTWORKERSINTHEDUSTHEALTH,INPARTICULARTHENARROWROADWAYCONSTRUCTION,DUSTPOLLUTIONISMORESERIOUS2。FROMTHE1960SONWARDS,INWESTERNDEVELOPEDCOUNTRIES,WETSPRAYINGBEGANGRADUALLYINTRODUCINGTHETECHNOLOGY,ALLKINDSOFWETCONCRETEJETSALSOBEDEVELOPED,SPRAYEDCONCRETEANDDRYTHEMAINDIFFERENCEISTHATENOUGHINWATERCEMENTRATIOREQUIREMENTSSHOULDBETHEVOLUMEOFTHEOPPORTUNITYTOJOINTHEMIXINGOFDIFFERENTWATER。WETSPRAYEDCONCRETEISEXPECTEDLOSETHEIRACCESSTOTHEFORMERMIXTUREHASADDEDAFOOTOFWATERMIXING,THELOSERINTHEDELIVERYOFTHECYLINDERISTHEWETCONCRETE;DRYSPRAYEDCONCRETEISLOSTINTHETRANSMISSIONOFTHEMATERIALDIDNOTJOINTHEMIXINGWATERDRYMATERIALGROUNDHUMIDITYMIXINGNATURALMATERIALSORDRYINGMATERIALS,ANDINSUFFICIENTVOLUMENOZZLEBEFOREMIXINGWITHWATER,DRYMIXTUREANDMIXQUICKLYAFTERTHEWHOLEWETCONCRETEDELIVEREDTOTHENOZZLE,SPEEDUPTHECOAGULATIONOFTHEDOPEDAFTERTHEJETTOBEAMAMATERIALOFCONSTRUCTION3ATTHENATIONALLEVEL,ASPEOPLESENVIRONMENTALAWARENESSANDENHANCETHEQUALITYOFSPRAYEDCONCRETEREQUIREMENTSOFTHEINCREASE,ANINCREASINGNUMBEROFWETCONCRETEINTOTHEUSEOFJETAIRCRAFTINRECENTYEARS,SOMEDOMESTICUNITSALSOBEGANTODEVELOPSEVERALWETCONCRETEJET,BUTTHESCALEOFPRODUCTIONISSTILLTOBEEXPANDEDTOSUMUP,JETWETCONCRETEOFTHEMAINADVANTAGESARETHEFOLLOWING1GREATLYREDUCEDTHEPLANEANDNEXTTOTHENOZZLESOFDUSTCONCENTRATIONANDELIMINATETHEHEALTHHAZARDSTOWORKERS2HIGHPRODUCTIVITYDRYCONCRETEJETSGENERALNOMORETHAN53M3/H,ANDTHEUSEOFJETWETCONCRETE,ARTIFICIALOPERATIONSUPTO103M3/H,AMECHANICALMANUAL,UPTO203M3/H3THEREBOUNDWASLOWJETDRY,CONCRETEREBOUNDOFUPTO15PERCENTTO50PERCENT,THEWETSPRAYTECHNICALREBOUNDRATECANBEREDUCEDTOBELOW104WETSPRAY,EASYTOCONTROLBECAUSEOFWATERCEMENTRATIO,AHIGHDEGREEOFCONCRETEHYDRATION,ITCANSIGNIFICANTLYIMPROVETHEQUALITYOFSPRAYEDCONCRETEANDIMPROVEQUALITYOFTHECONCRETEABSORBED2WETCONCRETEJETSANDTHETYPEOFWORKPRINCIPLECONCRETEPUMPINGMAINPISTONPUMPJETSPRAYANDAWETWETSPRAYINGMACHINESCREWPUMPTWOCATEGORIESPISTONPUMPJETAIRCRAFTWILLBEWETPLUNGERWETCONCRETEASACONCRETEPUMPTHEBASICBODYJET,WITHTHEEXPORTPIPELINETOTHENOZZLEANDINTHISACCESSTOCOMPRESSEDGASWILLJETOUTOFCONCRETE,WETSPRAYSUCHAHEAVYMACHINEGENERALHOWEVER,LONGDISTANCETRANSMISSION,SECONDBEACH,THEXIAOLANGDIWATERCONSERVANCYPROJECTANDOTHERLARGESCALEUSEOFTHEAIRCRAFTSMAINDISADVANTAGEISTHATLOWPRODUCTIVITY,ANDSCREWTHESTATORSETSOFWEARANDTEARMORESERIOUS,THEREWASLITTLESCOPEOFAPPLICATION3DOMESTICWETCONCRETEJETS31SPZ26WETCONCRETEJETSSPZ26WETCONCRETEJETSENTTOAGASROTORAIRCRAFTWETCONCRETE,ANDITSWORKINGPRINCIPLEOFLIWA280RUISHIASIMILARMODEL,BYITSROTORROTARYMOTORDRIVENBYREDUCER,THEAIRCRAFTEQUIPMENTLESSINVESTMENT,HIGHPRODUCTIVITY,LIGHTWEIGHT,GOODMOBILITY432PZ25BCONCRETEJETAIRCRAFTTOSPRAYDRY,WETSPRAYANDSPRAYTIDEITAUTOMATICALLYCLEAN,NONSTICKBLOCK,CUTTINGSPEED,LITTLEMORETHANEXPECTED,HIGHEFFICIENCY33IMPELLERWETCONCRETEWETCONCRETEIMPELLERJETAIRCRAFTISANEWWETSPRAYINGMACHINE,ITADOPTEDAIMPELLERFEEDINGDEVICE,ARELIABLE,LONGLIFE,TOAGGREGATESIZEOFTHEBIGADVANTAGESATPRESENT,CHINASDEVELOPMENTOFTHEWETCONCRETEPUMPINGANDDUALUSESPRAYSPRAYWETCONCRETETUNNELCONSTRUCTIONISINDISPENSABLETOENG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