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

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