混凝土搅拌站 毕业论文外文翻译

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1、一.外文翻译CONCRETEMIXINGPLANTTheapparatusofthepresentinventionrelatesgenerallytoconcretemixingplantsandmorespecificallytosuchplantsutilizedtoautomaticallyandcontinuouslymixseparateconcretecomponentsintoawiderangeofpredeterminedquantitiesorbatches.Conventionalconcretepla

2、ntsandmixertrucksthatcannormallyonlybeutilizedformixingsinglelargebatchesofconcrete.Suchapparatusoftenarepresettomixabatchthatistoolargeforaspecificjob.Theremainingconcretemusteitherbedumpedorresold.Iftheremainingconcreteistoberesold,itoftenmustbewatereddownbeforeit

3、reachesthesecondjobsite.Conventionaltruck-mountedmixersarenecessarilylargeinvolume,toaccommodatethelaborcostoftheindividualdriver.Furthermore,theconcretemustbeusedwithinafixedtimespanfromitsreceiptinthetruck.Delaysintransitorunforeseendelayatthesiteofusagemakeitdiff

4、iculttomaintainaconstantdeliveryschedule.Usuallyexcesstrucksanddriversmustbeusedtoassureareadysupplyofconcrete.Muchgreatercontrolofconcreteconsistencyandcostispossiblebyon-sitemixing.However,conventionalconcretemixersaredesignedforlargescalebatchmixing.Themixerdescr

5、ibedbelowfillstheneedforanon-sitemixerreadilyadjustabletomeettheinstantdemandsoftheuserastoquantityandquality.Afurtherproblemisthatwithapremixedbatch,itisdifficultorimpossibletomakelastminuteadjustmentsinmixtureproportions.Thisdifficultyarisesfrequentlyinareaswhereq

6、uickclimatechangesarecommonandfurther,wherespecificbuildingconstructiontechniquescallfordifferentconcretestresscharacteristics.TheseproblemsarerealizedtoalimiteddegreebytheapparatusdisclosedinU.S.Pat.Nos.3,339,898and3,469,824grantedtoFuttyetal.Thesepatentsdisclosedm

7、ixingmethodsandmixingtruckconstructionswhereinconcretecomponentsaresuppliedtoanelongatedtrough.Anelongatedshaftisprovidedwithinthetroughhavingapluralityofspatiallydisposedmixingpaddlesandhelicalfeedingscrews.Rotationoftheshaftsimultaneouslymixestheparticulateingredi

8、entsandmovesthemtowardanoutputend.U.S.Pat.No.3,310,293grantedtoZimmermandisclosesaconcretemixinganddeliverysystemwhereinconcretecomponents