Summarizationandimprovementofconcrete-ejectingmachinesAbstract:Thetextintroducestheprinciple,styleanddevelopmentprocessofdryandwettypeconcrete-ejectingmachines.Itanalyzesdomesticandforeignapplicationinstance,allkindsofconcrete-ejectingmachinesmostlymeritandflaw.Alsoitintroducessomerepresentationalwetcon-crete-ejectingmachinesdomesticdeveloped.Someflawsofconcrete-ejectingmachinesareimproved.Keywords:concrete-ejectingmachines,framecharacteristic,operatingprinciples,highway.Concreteistheuseofcompressedairjet,willbeallocatedacertainlevelandgoodwater-cementratiomixingconcretematerials,throughthepipelinebythejetnozzle,andhighspeedjetouttothesurfacebysprayingaconcretesuppor-tLayerissprayedconcreteconstructionequipmentoperationsinthemain.Asaconcretesprayingtechnologysavingconcreteandsteel,timber,labour-savingandimproveconstructionefficiencyandreducecosts,andothercharacteristics,theconcreteapplicanofthejetincreasinglycommon.Hasnowbeenwidelyus-edinrailway,highway,waterconservancy,construction,coalandotherbuildi-ngworksinconstruction,atunnelsolution,roadslope,constructionpit,unde-rgroundworksoftemporaryandpermanentcaretosupporttheconstructionm-achineryoperations.11TheworkofsprayedconcretemechanismandthedevelopmenttrendInsprayedconcreteoperations,theoverwhelmingmajorityoftheuseofconcrete-rotoraircraft,suchasjetstructureissimple,reliableperformance,asmall,lightweight,easytooperateandmaintenance。Dryjetprincipleandstructureare:therotorwithalinertoacertainspeedofrotation,andthecombinationofpressureplatesfixedonthelinerfixed,withaboardconnectedintothewindpipeanddischargingelbow,whenRotorequippedwithmaterialsinthevariousmaterialsCuprotationandintothewindtotheelbowanddischargingthesametime,intheroleofgasunderpressure,andmaterialsthroughtheelbowandexpectedtolosethematerialtransportedtothenozzleandnozzleinthewaterBlastingaway.Dryconcretejetofthemainadvantagesisalongdistancecarrier,simpleequipment,durable,butbecauseitissodrynozzles,mixingconcretemixedwithwater,andthereforetheconstructiondust,aremoreresilient,drysprayingoperationsagainstworkersinthedustHealth,inparticularthenarrowroadwayconstruction,dustpollutionismoreserious2。Fromthe1960sonwards,inWesterndevelopedcountries,wetsprayingbegangraduallyintroducingthetechnology,allkindsofwetconcreteJetsalsobedeveloped,sprayedconcreteanddrythemaindifferenceisthatenough(inwater-cementratiorequirementsshouldbeThevolumeof)theopportunitytojointhemixingofdifferentwater。WetsprayedconcreteisexpectedlosetheiraccesstotheformerMixturehasaddedafootofwatermixing,theloserinthedeliveryofthecylinderisthewetconcrete；drysprayedconcreteislostinthetransmissionofthematerialdidnotjointhemixingWaterdrymaterial(groundhumiditymixingnaturalmaterialsordryingmaterials),andinsufficientvolumenozzlebeforemixingwithwater,drymixtureandmixquicklyafterthewholewetconcretedeliveredtothenozzle,speedupthecoagulationofthedopedAfterthejettobeamamaterialofconstruction3.Atthenationallevel,aspeoplesenvironmentalawarenessandenhancethequalityofsprayedconcreterequirementsoftheincrease,anincreasingnumberofwetconcreteintotheuseofjetaircraft.Inrecentyears,somedomesticunitsalsobegantodevelopseveralwetconcretejet,butthescaleofproductionisstilltobeexpanded.Tosumup,jetwetconcreteofthemainadvantagesarethefollowing:1)greatlyreducedtheplaneandnexttothenozzlesofdustconcentrationandeliminatethehealthhazardstoworkers.2)highproductivity.DryconcreteJetsgeneralnomorethan53m3/h,andtheuseofjetwetconcrete,artificialoperationsupto103m3/h,amechanicalmanual,upto203m3/h.3)Thereboundwaslow.JetDry,concretereboundofupto15percentto50percent,thewetspraytechnicalreboundratecanbereducedtobelow10%.4)wetspray,easytocontrolbecauseofwater-cementratio,ahighdegreeofconcretehydration,itcansignificantlyimprovethequalityofsprayedconcreteandimprovequalityoftheconcreteabsorbed.2WetconcreteJetsandthetypeofworkprincipleConcretePumpingmainpistonpump-jetsprayandawet-wetsprayingmachinescrewpumptwocategories.Pistonpump-jetaircraftwillbewetplunger-wetconcreteasaconcretepumpthebasicbodyjet,withtheexportpipelinetothenozzleandinthisAccesstocompressedgaswilljetoutofconcrete,wetspraysuchaheavymachinegeneralHowever,longdistancetransmission,SecondBeach,theXiaolangdiWaterConservancyProjectandotherlarge-scaleuseoftheaircraftsmaindisadvantageisthatlowproductivity,andscrewthestatorsetsofwearandtearmoreserious,therewaslittlescopeofapplication.3DomesticwetconcreteJets3.1SPZ26-wetconcreteJetsSPZ26-wetconcretejetsenttoagas-rotoraircraftwetconcrete,anditsworkingprincipleofLiwa280RuishiAsimilarmodel,byitsrotorrotarymotordrivenbyreducer,theaircraftequipmentlessinvestment,highproductivity,lightweight,Goodmobility4.3.2PZ25BConcretejetaircrafttospraydry,wetsprayandspraytide.Itautomaticallyclean,non-stickblock,cuttingspeed,littlemorethanexpected,highefficiency.3.3impellerwetconcretewetconcreteimpellerjetaircraftisanewwetsprayingmachine,itadoptedaimpellerfeedingdevice,areliable,longlife,toaggregatesizeofthebigadvantages.Atpresent,Chinasdevelopmentofthewetconcretepumpinganddual-usespray-spray-wetconcretetunnelconstructionisindispensabletoengineeringequipment,themainimpellerandrotorpiston-typepumpsandwetsprayingmachine.Impellerandrotorpistonwetsprayingmachineshort-distancetransportation,displacementofsmall,fragilepiecesofshortlife,seriousleakagepulp,cleaningalongtime5.4JetpromotetheuseofwetconcreteinsomeoftheissuestoberesolvedAtpresent,duetowetjettechnologyhasobviousadvantages,wetconcreteJetsintheprojectisalsoanincreasingnumberofapplications,butbecausetherearesomeoutstandingissues,thewetconcretetopromotetheuseofjetplayedacertainobstaclesRole,eveninChina,currentlythemainsprayedconcreteoperationsisstilldryspray.1)useofwetconcretejetofliquidcondensate,ajointventureofimportsandhigherprices(upto6000yuan/t8000元/t),anddomesticliquidcondensateofnoproduction,shouldberelativelydrySprayofpowderandquick-settinglowprice(morethan1000yuan/t).2)lowlaborcostsandpeoplesenvironmentalawarenesstobeincreased.3)wetconcretejetoperations,morecomplexequipment,operationandmaintenanceofjetaircraftforlessthandry.4)theuseofwetconcretejetoperations,higherequipmentinvestment.5Improvementofconcrete-ejectingmachines5.1Aftertheconcreteimprovementofthecharacteristicsofajet1)dustbetter.Theimproveduseofthesealcannotbedust,hasgreatlyimprovedtheworkingconditionsofworkers,increasedlaborproductivity.2)increasetheflexibilityofhigh-adhesiverubbermaterialcavity.Concretecanbeaneffectivesolutiontotheproblemofbondedeasily,removetheconcretetoreducethenumberofbondedandimprovelaborefficiency.3)useofwear-resistantrubberpads.Rubbermatsmorethandoublethewearresistance,adecreaseofrubberpadstoreducethefrequencyoftheuseofreplacementcost.4)theoverallchangefromtheoriginaldriveshaftcomposedofthreeparts,noteasytosolvethedemolition,theproblemofmaintenance.5.2ImprovethedifferencebetweenbeforeandaftertheconcreteJets1)theoriginalconcretejetrotatingbodyformedbythewear-resistantcastironfoundry,withouttreatment,aftertherust-bonding,improvedafterthejetcavitysprayinganti-rusttreatmentandgreatlyreducethepossibilityofabond.2)theoriginalconcretejetrotationofdirectcontactwiththematerialI,Mifengbuyan；feedmouthwithoutsealingdevice,improvedtoincreaseawear-resistantrubberpadsandmouthandfeedring.3）Inrotatingbodyandmouthspraytoincreaseflexiblerubbermaterial,andtherotationoftheoriginalconcretejetsprayandaflexiblerubbermouthcavity.Concreteworkofahigh-pressurejetofaircavity,flexiblerubberintheaircavityunderthepressureofbeingcompressed,rotatingbodyisconstantlyrotating,whentherotationofthechamberpassedaflexiblerubberpressurezone,thepressuredisappeared,flexibleRubbercavityinthestretchunderitsownrestitutionduetothehighflexibilityofrubberattachedtothecavityontheconcreteandscatteredbysqueezingdown,automaticremovaloftheconcretebonding,inordertofacilitatemaintenanceandreplacementoftherotatingflexiblerubberLiucavity,theoverall12willbesplitintofourcavity,eachofthethreecavity.Thesametoken,Iexpectedtoincreaseinaflexiblerubbermaterialcavity.4)theoriginalconcretejetdriveshaftfortheoverallstructure,cleaninguptherotatingbodycavityorreplacementworkflexiblerubbermaterialcavity,tobescreenedinShangzuobodyandcanalsoXiediao,willimprovetheentireshaftisdividedintothreeparts,Themiddleofaconnectingshaft,throughthehomeside,connectingshaft,thepinwillbelinkedtothetwo-axis,demolition,onlytoteardowntheshaftcanbeconnectedinblocksoflift,thereplacementofflexiblerubberbodycavityorclean-uprotation,Provincewhentheeffort,boostedbyincreasingtheflexibilityofrubberrubbersealcavityandthedriveshaftconnectedtothebodystructureandeffectivesolutiontothedustandinconveniencetothedemolitionofconcreteandbondissues,someusefromthescene,hasbeenmadeGoodresults.6Theendconclusionofawavewhilesprayingcanreducedustconcentrationandreducetherateofrebound,butthedusthazardstillexists,stillhigherratesreboundfromtherequiredstandardthereisstillaconsiderabledistance.Allcountriesintheworldofwetconcreteofthejetatthesametime,developedajetofwetconcrete,andincreasinglymature,manycountrieshavestartedtousealot.Chinascurrentwet-spraymethodisstillintestingstageandnotyetfullypromotetheapplicationlevel.Mainlywetsprayingmachines