Type test

Inspectionmethod

Productsthathavepassedthetypetest,usuallyinoneofthefollowingsituations,shouldgenerallybetypetested,ortheycanbetypetestedaccordingtotheactualsituationoftheproduct:

a)Trialtypeinspectionofnewproductsoroldproductstransferredtofactoryproduction;

b)Afterformalproduction,iftherearemajorchangesinstructure,material,process,whichmayaffectproductqualityandperformance;

c)Duringformalproduction,aperiodicalinspectionshouldbecarriedoutregularlyorafteracertainamountofproductionhasbeenaccumulated;

d)Whentheproductisresumingproductionafteralong-termsuspensionofproduction;

e)Whenthereisabigdifferencebetweentheresultsofthisfactoryinspectionandthelasttypeinspection;

f)Whenthenationalqualitysupervisionagencyputsforwardthetypeinspectionrequirements.

Forexample:"NationalStandardGB8898Audio/VideoandSimilarElectronicEquipmentSafetyRequirements"ExplanationofArticle2.8.1:

Test

Typetest:Adesignandmanufactureofoneormoresamplestodeterminewhetherthedesignmeetsalltherequirementsofthisstandardandconductatest.

Hydraulicpumptypetestbenchdesignanalysis

Inthedevelopmentandresearchprocessofhydrauliccomponents,thecorrespondingtestbenchistochecktheworkingperformanceofthecomponentsandfindtheproblemsofthecomponents,andpassthetestandAnimportantmeansofanalyzingandfindingasolutiontotheproblem.Thehydraulicpumptestbenchisatestbenchfortestingtherelevantperformanceofthehydraulicpump.Accordingtothedifferenttestitems,thehydraulicpumptestbenchcanbedividedintoafactorytestbenchandatypetestbench;thefactorytestbenchistotesttheprocessingqualityofthefinalizedproduct.Thetypetestbenchisforacomprehensiveassessmentofnewlydesignedanddevelopedpumps.

Testcircuitdesign

Accordingtothehydraulicpumptypeteststandardandrefertothetestcircuitprovidedinthehydraulicengineeringmanualandthestructureandvariabletypeofthedevelopedhydraulicpumptodeterminewhichcircuitschemetouse.Intheconstructionofthetestbench,becausethenewproductdevelopedisanewtypeofconstantpressurevariableradialpistonpump,wechoosethetestcircuit.Inthedynamicperformanceandimpacttest,itisachievedbychangingtheinputsignaloftheelectro-hydraulicproportionalreliefvalve.However,duringthetest,itwasfoundthattheresponsetimeofthereliefvalvewasslow,whichcouldnotmeetthetestrequirements;inaddition,theelectro-hydraulicproportionalspeedcontrolwasused.Whenthevalveisusedasaloadingvalve,whentheadjustmentprocessistoofast,thespeedcontrolvalvewillsuddenlyclose.

Selectionofhydrauliccomponentsandaccessories

Intheselectionprocessofhydrauliccomponentsandaccessories,firstconsiderthemaximumpressureandmaximumflowtobeadjustedinthetestanditsadjustmentrange.Secondly,considertheoperabilityanddegreeofautomationofthecontrol,andagaincomparetheproductsofdomesticandforeigncompaniesbasedoncomparableperformanceandqualityreputation,andfinallyconsiderthedegreeofcapitalsufficiency.Afteracomprehensivebalance,thecomponentmodelandmanufactureraredetermined.

Consideringtheconvenienceofadjustmentandthesafetyoftestpersonnel,electro-hydraulicproportionalcontrolmodeisselectedforthefrequentlyadjustedreliefvalveandloadingvalve.Thepressureandflowrateshouldalsobeconsideredwhenselectingaccessories,andthecalculationandselectionshouldbecarriedoutaccordingtotheconventionaldesignprinciplesofthehydraulicsystem.Inaddition,theconvenienceofinstallationandmaintenanceandthereliabilityofqualityshouldbeconsidered.

Heatbalancecalculationandcoolerselection

Becausetheoiltemperatureisaveryimportanttestconditioninthehydraulicpumptypetestcontent,theoiltemperaturemustbeadjustedandthermostaticallycontrolledinthedesign.Inotherwords,theheatbalancecalculationiscarriedouttobalancetheheatingpowerandheatdissipationpowerduringthetest.Consideringtheconstanttemperaturecontrolandreliability,thecoolingpowerofthecoolershouldbeequaltoorgreaterthantheheatingpowerofthesystem,plustheheatdissipationofthefueltank.Thepowercanensuretherealizationoftemperatureadjustment.Whenthetemperaturedropsduringthetest,thetemperaturecanberaisedbystoppingthewatercirculationofthecooler.

Measuringinstrument

1Thechoiceofmeasuringinstrument:

Withtherapiddevelopmentofscienceandtechnology,thetestinginstrumentisalsoconstantlyupdatedandreplacedbythehydraulictestinginstrument.Theoriginaldialreadsthecombinationofsensorsanddisplayinstruments,andfurtherdevelopstothecombinationofsensorsandcomputers.Computer-aidedtestingtechnology(CAT)isusedtocollectandprocessdatawithcomputers,whichcanensurereal-timemeasurement,improvetestingaccuracy,andpreventhumanintervention.Errorscanimprovetheefficiencyofdataprocessing;thecomputercanalsobeusedtocontrolthetestprogram,generatetheloadspectrum,morestrictlycontrolthetestconditions,improvethetestefficiency,andusethecombinationofhigh-precisionsensors,displayinstrumentsandcomputers.

2Measuringpointpositiondesign:

Themeasuringpointislocatedatadistanceof2to4pipediametersfromthepumpport,andatadistanceofmorethan5pipediametersfromthevalveinlet,awayfromthevalveThedistancefromtheoutletismorethan10timesthepipediameter;thetemperaturemeasurementpointis2to4timesawayfromthepumppressuremeasurementpoint,andwithin15timesthepipediameterfromthevalveinlet;theflowmeasurementpointshouldbeinthelow-pressuresteady-stateareaof​​theliquidflow.

DiscussiononTypeTestStandardsforDirectlyBuriedThermalPipelines

Introducedthedevelopmentofthedomesticdirect-buriedthermalComponentTypeTestRules"andCJ/T200-2004"UrbanHeatingPrefabricatedDirectlyBuriedSteamInsulationPipeTechnicalConditions"andotherstandardspecificationswerediscussed,andimprovementsweremadetotheproblemsinsandboxtest,thermalinsulationperformancetest,productcoverage,etc.Suggest.

Overviewofthedevelopmentofdomesticdirect-buriedthermalpipelinetypeteststandards

ThetypetestofdomesticthermalAfterthethermalpipelinewasburied,therelevantregulationsandstandardswerenotperfectuntiltheMinistryofConstructionCJ/T200—2004"TechnicalConditionsforPrefabricatedDirectlyBuriedSteamInsulationPipesforUrbanHeating"testedtheoverallcompressivestrengthandaxialmovementperformanceoftheworkingpipe(sandbox).Test)andthermalinsulationperformancetestareincludedinthebasicperformancetestcontent.The"ImpactStrengthTestMethod"isspecifiedinAppendixA.Sofar,themaintypetestmethodsofthermalpipingcomponentshavebeenclarifiedintheformofperformancetestitems.TheTS-GD7002-2006"TypeTestRulesforPressurePipingComponents"implementedbytheGeneralAdministrationofQualitySupervision,InspectionandQuarantine2007-02furtherdeterminedthetypetestitemsandmethods.

Inconsistentrequirementsofrelevantstandardsandspecifications

1Totalcompressivestrengthandaxialslidingperformancetest(sandboxtest)

1)SandboxspecificationsSize:

Before2007,severalsandboxtestingmachinesproducedbythedirect-buriedheatingpipelinemanufacturerinXuzhouCityweremanufacturedinaccordancewiththerequirementsofCJ/T200-2004"TechnicalRegulationsforUrbanDirect-BuriedHeatingPipelineEngineering".After2007,itwasproducedinaccordancewiththerequirementsofTSGD7002-2006"TypeTestRulesforPressurePipingComponents".Thereisabigdifferencebetweenthetwo,mainlyinthesizeofthesandbox.

2)Loadingandforcemeasurementmethods:

Theoutertubeshouldbearauniformloadduringtheoverallcompressivestrengthandaxialslidingtest,andtheloadvalueshouldnotbelessthan0.08MPa,Equippedwitharigidpressureplateonthesandbox.Theoverallcompressivestrengthofthesteaminsulationpipelineshouldnotbelessthan0.08MPa.Thesandboxisequippedwitharigidpressureplate,andtheloadappliedontherigidcoverincludestheself-weightofGaza.

3)Testsand:

Drysandmustbeusedinthesandboxtest,andsandwithaparticlesizeofabout2mmisrequiredtoaccountforacertainproportion,indicatingthatsandboxesarebeingcarriedoutabroadDuringthetest,theinfluenceofthedrynessanddensityofthesandonthetestresultswasnoticed.

2Insulationperformancetest

Generallyadoptedinthecountry(belongingtotheproductstandard),theperformancetestmethodisstipulatedinaccordancewithCT/T140-2001"HeatPipeInsulationStructureHeatLossTestandInsulationTherearefourmethodsfortestingtheheatpreservationeffectofheatingpipesspecifiedinthe“EffectEvaluationMethod”.Amongthem,thesimplersurfacetemperaturemethodisselectedtoquicklytesttheheatpreservationperformanceofdirectlyburiedthermalpipes.Themainmethodistouseaportableinfraredthermometertomeasuretheoutersurfacetemperatureofthesample.Whenthetemperatureoftheinnertubemediumis300°C,theoutersurfacetemperatureislessthan50°Casqualified.

Coverageoftypetest

Thecoverageofdirectburiedpipelineis:

(1)Thescopeofapplicationofworkingpipeanditsfittingsis0.5DN≤DN≤2DN,0.5S/DN≤S/DN≤3S/DN(Sisthenominalwallthicknessoftheinnertube).

(2)Ithasthesameinsulationstructureasthesample(testpiece).

(3)Theratioofthenominaldiameteroftheoutertubetotheworkingtubedoesnotexceedtheratioofthesample(testpiece).

(4)Theweldingprocessforworkingpipesandpipefittingscoveringspecificationsandsizeshasbeenqualified.

Theaboverequirementsdonothaveanyambiguityinthespecificationsanddimensionsofthetypicalproducttypetestcoverageofpressurepipingcomponents,buttherearedisputesontheunderstandingofthesameinsulationstructureandmaterials.

Designanddevelopmentofmulti-wayvalvetypetestbench

Multi-wayvalve,asthecorecomponentofthehydraulicsystemofconstructionmachinery,hasanimpactonthecontrolperformance,reliabilityandservicelifeofthewholemachine.Theimportantinfluenceishowtoaccuratelyandcomprehensivelyassessthevariousperformanceandqualityparametersofthemulti-wayvalve,whichisofgreatsignificancetothedevelopmentofthemulti-wayvalveandtheimprovementofthetechnicalleveloflocalization.Thedomesticmulti-wayvalvetestsystemismainlyusedforfactoryinspectionanddoesnotinvolveallitemsoftypetesting,resultingininsufficientdepthofresearchontherelevantcharacteristicsofthemulti-wayvalve.

Typetestloopsystemdesign

Themaintechnicalparametersofthetestsystemare:themaximumworkingpressureofthemainsystemis35MPa,themaximumdesignflowrateis250L/min,andthemaximumpressuretestpressureis25MPa.Thesystemloopofthemulti-wayvalvetypetestbenchconsistsoftwoparts:themaintestsystemandtheauxiliarysystem.Themainmulti-wayvalvetestsystemincludesaloadingunit,pressureandflowdetectionunits;onepartoftheauxiliarytestsystemprovidespilotcontroloilforcomponentssuchaspilotmulti-wayvalves,andprovidesstepcontrolsignalsduringtransienttests;theotherpartisTheendurancetestprovidescontrolpressure,andhightemperatureoilisprovidedinthehightemperaturetest,andtheliquidlevelinthesmalloiltankdoesnotexceedthesetupperlimit,soastoensurethenormaloilsupplyoftheentiremaintestsystem.

Introductiontothecharacteristicfunctionsofthetypetest

Integratetheoptimizeddesignplanofthefactorytestsystemoftheexistingmulti-wayvalveinChina,byaddingtwo-wayloadingunitorhydrauliccontrolone-wayinthefastswitchinglinkoftheoilcircuitThevalveblockrealizesoilcircuitswitching,whichcaneffectivelyavoidfrequentvalveporttestoilpipes.Comparedwiththefunctionsofthetraditionalhydrauliccomponentfactorytestsystem,thetestbenchaddsthedetectionofthedurability,micro-movementcharacteristicsandtransienttestofthehydraulicvalveonthebasisofintegratingtheoriginaldesign.Amongthem,thetransienttestrequiresthestep-loadingvalvetobeabletomovequicklytogenerateapressuregradientthatsatisfiesthetransientconditionsatthetestedvalveport,andrecordthepressurechangeprocessattheinletofthetestedvalve8throughapressuresensorandarecorder.

1Weighingmeasurementmethod:

Theinternalleakagetestdeviceofthemulti-wayreversingvalveadoptsasingle-pointweighingsensor,whichhasanoverloadprotectionsetting,andcanbecorrectedforangledifferenceandprotectionThegradereachesIP66.Whenthespoolvalvecoreofthetestedvalve8isintheneutralposition,theAandBportsarefilledwithoil,theoverflowvalveispressurizedtothenominalpressure,andtheotherportsexceptfortheTportareblocked,andtheleakageamountismeasuredfromtheTport.Theloadcellconvertstheweightoftheleakingoilintoanelectricsignal,andthenintotheinternalleakageamount,whichisdisplayedontheindustrialcontroldisplay.

2Endurancetest:

Thetestbenchusesthehigh-pressurevanepumpintheauxiliarysystemtoprovidepressureoilforthecontrolcircuit.Atthesametime,thepumpcanalsobeexchangedwiththecylindercontrolslidevalvetoachievemultiplechannelsDurabilitytestofthevalve.

Inthetest,thepressureofthemainsafetyvalveofthetestedmulti-wayvalveisadjustedtothenominalpressure,andtheflowthroughthetestedvalveisthetestflow.Thefrequencyiscontinuouslycommutation.Recordthereversingtimesofthereversingvalveandtheoperationtimesofthesafetyvalveduringthetest,andafterreachingthereversingtimesspecifiedbythelifeindex,checkwhetherthemainpartsofthetestedvalveareintact.

3Micro-motioncharacteristictest:

Basedonthemulti-wayvalvedurabilitytestbench,afine-tuningmechanismcanbeinstalledbetweenthecylinderandthevalvetobetested,andthenthemicro-motioncharacteristictestcanbecarriedout.operate.Thefine-tuningmechanismcanmovetheslidevalveinsmallincrements.Theprincipleistoconvertthelinearstrokeintoapitchbyinputtingthelinearstroke,andthenconvertthepitchintoalinearstrokeastheoutput.Eachprocesscanachieveasmallincrementaloutputthroughthepitchcontrol.Thedisplacementsensorofthepartcanmeasurethesizeoftheincrement,soastorealizetheoperatingconditionsofthespooloftheslow-movingspoolvalve,andobtainthemicro-motioncharacteristiccurveofthespoolvalvestrokeandpressure(flow)respectively.

4Expansionunitofthetypetestbench:

Thedesignofthemulti-wayvalvetestbenchtakesintoaccounttheinstallationofthelaterexpansionequipment,soitsdesignisexpandableandcanbeThestandardtestofdivertervalve,reversingvalve,overflowvalveandpressurereducingvalvewillbegraduallyimprovedaccordingtoactualneeds.