文献翻译工程机械搅拌设备用称重传感器的选型Word格式.docx
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文献翻译工程机械搅拌设备用称重传感器的选型Word格式.docx
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Engineeringmachinerymixingconcretemixingequipmentusuallyincludefloor(stations),theasphaltmixingplant,stabilizedsoilmixingconcretemixingplantsandshipsatsea,mixingthemwithconcretefloor(stations)themosttypical.Belowtheconcretemixingplant(stations)asanexampleforanalysis.
1concretemixingplant(station)onthebasicrequirementsWeighingSystem
1.1accurateweighingerroronthestrengthofconcreteisstronglyinfluenced,inparticularwater-cementratiomeasurementprecision,becausestrengthandwater-cementratioislinear.Therelevantnationalstandards,cement,water,additives,theadmixtureofdynamicmeasurementaccuracyof±
1%,sand,stonedynamicmeasurementaccuracyof±
2%.
1.2Quickmeetmixingstationdutycyclerequirements.
1.3varietythatmoneytothetypeofpre-selection,tofacilitatethetransformationtoadapttoavarietyofdifferentratioandcapacityrequirements.
1.4simplestructureweighingdevicestosimplestructure,solidandreliable,stableperformance,easyoperation.
Clearly,theuseofelectronicweighingsystemsensormachineryweighingmorethanmeettherequirements.Therefore,theloadcellfloorintheconcretemixingstationstobemorewidelyused.However,objectivelyspeaking,comparedwiththemechanicalleverscalesinthe"
solidandreliable,stableperformance,"
asasensorelectronicweighingsystemhasmuchworktodo.
2concretemixingstationsfloorintheloadcelloperatingconditions
Forcommerceandthegeneralmeasurementofelectronicscalesagreatdifferenceis,inconcretemixingstationsfloorloadcellinaveryadverseoperatingconditions,stressenvironmentisverycomplex,andthegeneralelectronicproductscomparedtotheoperatingenvironment,agreaterrandomness.
2.1ambienttemperatureandhumidity
Concretemixingstationisnormallyopenfloorinstallation,sensormaybesubjecttothesunandrain,temperaturedramaticchanges.Andmanyconstructionprojectsareinverybadnaturalconditionsinthemountainsorremoteareas.Therefore,wemustconsidergreatertemperaturerangeandhigherhumidityconditions.Concreteintheproductionprocessneedswater.Inthedeliveryofwaterandweighingprocessandalsohavealotofwaterinthegas,insomeformwithinrelativelysmallhumidenvironment.StirinthetemperaturecontrolintheHouse,therearehigh-temperatureandlow-temperatureconditionsofthedifferentrequirementsofcondition.Runninginthesummerwhenlow-temperatureconditiontothezero-belowcoldwindand加冰stirring,thenbuildingacondensedwaterwillbewelldemonstratedhighhumiditybuilding.
2.2dust
Concreteintheproductionprocessrequiresalargeamountofcement,coalashandtheappropriateamountofadmixture.Thesewereinthetransportationandpowderweighingprocesswillproducedust.Eventheaggregate,inthecourseoftransmissionhavealsodust.Someofthesedustsensorwillbeattachedtothesurface.Thedustandwatervaporinthecommonrole,thesensorwillbemoreseriouscorrosion.Therefore,thedamagepowderweighingsensorsusuallyweighthantheothersensorsmorefrequently.
2.3ShockandVibration
Inthefeedprocess,theimpactofaggregatewillhave.Sensorsshouldbeabletobear5gacceleration.Stirintheprocess,willhavesustainedvibration,andvibrationwouldhavefatiguedamage.
2.4man-madeenvironment
Man-madeenvironmentistheproductreliabilitydesignoneofthefactorsthatmustbeconsidered.ConcreteMixingfloorinstalledattheconstructionsiteingeneral.Large-scaleuseoftemporaryworkersonsite,ofwhichaconsiderablenumberoftemporarylowlevelofeducation,lackofthenecessaryskills.Intermsoffacilities,suchasthemaintenanceandcleaningwork,thesensormaybeinthehigh-pressurewatersputtering,misoperationcausedoverload,andsoon.Clearly,thesensorshouldbeinsuchanenvironmentandalong-termreliableundertheconditionsoftheoperationistocarryoutsomespecialdesign.
Thesebasicrequirementsandoperatingconditionscanbeusedasconcretemixingplant(stations)bytheloadcellselectionbasis.
Threeconcretemixingplant(stations)tousewhenweighingsensortobeconsideredbytheSelectionProblems
3.1weighingsensorpayloadcapacitydetermination
Weighingsensorpayloadcapacityusually
Hoppersensorratedload=+ratedthemselvesthatweight
(0.6~0.7)×
onlyafewsensors
Infactpeopleinthechoiceofsensorintegratedcapacityevenwhentheyconsiderthesizeandimpactloadselectedsafetyfactor.Safetyfactorwiththechoiceofsensorsensitivitycloselyrelated.Domesticandforeigncommonstrainloadsensorsensitivitymajorityof2mV/V,butthereare1mV/V,suchascolumnsensor;
Also3mV/V,assomecantileversensorandsensorplateCentral;
Twistedringsensorusually2.85mV/V.Stirupstairsintheuseofsensorsarebasically2mV/V.
3.2weighingthechoiceofsensoraccuracy
Thechoiceofsensoraccuracyoftheweighingsystemtomeettheaccuracyrequirements,isnotone-sidedpursuitofthehighlevelsensoraccuracy.Inmulti-sensorcombinationusedonlywhenitsintegratederror
Δr=δ/√n
Where,δonlyasinglesensoraccuracy,theuseofcombinationsofnisonlyafewsensors.
CurrentlystirringupstairspopularS-typesensor,thecantileversensor,thesensorplatering,linear,hysteresis,repeatability,andtemperaturesensitivityeffectsofcreep,andotherkeyindicatorsvastmajorityofmanufacturersareisbetterthan0.05%,themajorityofmanufacturersbetterthan0.03%,somemanufacturersbetterthan0.02%.Itsintegratedsinglesensorerrorofclosetoorbetterthan0.1%.Multi-sensorcombinationonlyafteritsintegratederrorevensmaller.Itcanbesaidthatthegeneralloadcellmanufacturersofproductstomeettherequirements.
Previously,manymanufacturersstirringfloor,itsprovisionsstaticaccuracyoftheweighingsystem,respectively0.1%and0.3%respectively.Thus,theuseofsingle-sensorweighingonly,individualindicatorsof0.05%ofthesensorwillsatisfy0.3%precisionweighingrequirements.Theuseofthreeovertheweigh-sensor,singleindicators0.05%sensorscanalsomeet0.1%accuracyrequirements.
Itmustbepointedoutisthattheaccuracyoftheweighingsystemisstaticprecision,whiletheconcreteisthenationalstandardsrequiredynamicaccuracy,whichisduetotheconstantweighingofrawmaterialsforthematerialinthebodyofgravityweighingtheimpactoferrorsincreasedsignificantly.Above0.1%and0.3%respectively,theabilityofstaticaccuracyreached1%and2%ofthedynamicaccuracyforfeedingsystemwiththedesign.
Now,manymanufacturersprovisionsoftheaccuracyofitsweighingsysteminthe0-ratedweighingthatmoneywithinthecement,water,additives±
1%,sand,stone±
2%.Notes,ready-mixedconcretenationalstandardsrequirethatphysicalmeasurementaccuracy,andgeneralmeasurementinstruments0~20%oftherelativeerrorgreater,orconcretemixingplant(station)providestheindustrystandardinthe20~100%oftheweightingofthemeetcement,water,additives±
2%ofthemorepracticalmeasurestoallowsomedeviation.Amorereasonableapproachistheuseofprecisionweighinginstrumenttaggingindustryterminologytoexpressthatasacumulativehopperscalesshouldbeusedinautomaticweighingaccuracyofthegradingmarks1.0and2.0.Suchscaletestprojectinlinewiththepurposes,includingbothmaterialstesting(determiningtheaccumulatederror)alsoincludesstatictest.
AutomaticWeighingatitsmaximumallowableerrorinTable1.
Criteriausedinastaticloadtestandnon-automaticweighing,shouldmeettherequirementsinTable2.
Usually1.0weighdesignforthe1000points,2.0Balanceofdesignfor500points.Wecanseethattherangeinthehigh-1.0scaleerroris0.15%,2.0Balanceoferroris0.3%,notmanufacturersthanbeforeprovisionsof0.1%and0.3%statichighaccuracy.Butinthelowrangeofaccuracyisindeedincreased.Undersuchcircumstancestheneedtoconfirmtheselectioninthelowrangeofthesensorcanalsomeettherequirements.
Accordingtoweighthedegreeofchoiceofthesimplestsensoris1,000pointsmethodofselectionof1000attheweigh-insensors,500hoursoftheweigh-selection500pointsofthesensors.Nationalstandardsinweighingsensoraccuracyistousethedegreetoexpress,butbecauseofvariousreasons,mostproductio
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