JN-A型自熟式米粉挤丝机设计【说明书+CAD】
收藏
资源目录
压缩包内文档预览：(预览前15页/共19页)
编号：10048984
类型：共享资源
大小：1.97MB
格式：RAR
上传时间：2018-04-23
上传人：柒哥
认证信息
个人认证
杨**（实名认证）
湖南
IP属地：湖南
34
积分
- 关 键 词：
-
jn
米粉
挤丝机
设计
说明书
仿单
cad
- 资源描述：
-
【温馨提示】 购买原稿文件请充值后自助下载。
以下预览截图到的都有源文件,图纸是CAD，文档是WORD，下载后即可获得，所见即所得。
预览截图请勿抄袭，原稿文件完整清晰，无水印，可编辑。
有疑问可以咨询QQ：12401814
- 内容简介：
-
ASIMPLIFIEDTWINSCREWCOROTATINGFOODEXTRUDERDESIGN,FABRICATIONANDTESTINGSAMANSSENANAYAKEA,BCLARKEB,DIVISIONOFAGRICULTURALANDPLANTATIONENGINEERING,THEOPENUNIVERSITYOFSRILANKA,NAWALA,NUGEGODA,SRILANKADEPARTMENTOFPOSTHARVESTTECHNOLOGY,SCHOOLOFAGRICULTURE,FOODANDENVIRONMENT,SILSOECOLLAGE,CRANFIELDUNIVERSITY,SILSOE,BEDFORDSHIREMK454DT,UKRECEIVED6JULY1998ACCEPTED10FEBRUARY1999ABSTRACTASIMPLIFIEDCOROTATINGTWINSCREWFOODEXTRUDERWASDESIGNED,FABRICATEDANDTESTEDINENGLAND,FOLLOWEDBYEXTENSIVETESTINGINSRILANKAITWASBUILTASAMODELTOMEETTHESPECIFICPRODUCTANDFINANCIALCONSTRAINTSOFLESSDEVELOPEDCOUNTRIESANDWASEXPECTEDTOBEUSEDINTHOSECOUNTRIESTOWIDENTHEPRODUCTIONCAPABILITIESOFEXTRUDEDFOODSTHEMACHINEHADANESTIMATEDDELIVERYOF10KG/HANDWASMADEMAINLYWITHMILDSTEELTWOTYPESOFSCREWWEREMADE,ONEWITHACONSTANTPITCHOF14MMANDTHEOTHERWITHVARYINGPITCHINSEGMENTSOF14,12AND10MMTHEMACHINEWASPOWEREDBYA22KWELECTRICMOTORWITHELECTRONICSPEEDCONTROLTHEMACHINEALSOHADELECTRICALHEATINGWITHATEMPERATURECONTROLLERANDAPRESSURESENSINGDEVICETHECOSTOFFABRICATIONOFTHEMACHINEWASESTIMATEDAT2000WITHMOSTOFTHEPARTSBUILTINAFAIRLYSIMPLEWORKSHOPAMIXTUREOFRICEANDDRIEDBANANAWASSUCCESSFULLYEXTRUDEDASAPOTENTIALSNACKFOODANDONTHEBASISOFMAXIMUMEXPANSIONTHEBESTRESULTSWASOBTAINEDFROMABARRELTEMPERATUREOF120C,SCREWSPEED125RPM,FEEDMOISTURE15ANDWITHADIEORIFICESIZEOF3MMWHENTHEALTERNATIVECOMPRESSIONSCREWWASTESTEDVERYSIMILARRESULTSWEREACHIEVEDWITHNOSIGNIFICANTIMPROVEMENTINPRODUCTEXPANSION1999ELSEVIERSCIENCELTDALLRIGHTSRESERVEDKEYWORDSTWINSCREWEXTRUDERDESIGNLOWCOSTSNACKFOODCONTINUOUSCOOKERLOCALCONSTRUCTIONCEREALMIXTURESNOMENCLATUREADIEDIAMETERMMBCHANNELWIDTHMMCSCREWCIRCUMFERENCEMMDSCREWCOREDIAMETERDOUTERDIAMETEROFSCREWSMMHFLIGHTDEPTHMMMMOISTURECONTENTWETBASISNNUMBEROFFIGHTTURNSNSPEEDANGULARREV/MINPPITCHMMQDELIVERYRATEMM3/MINSTOTALHELICALLENGTHOFSCREWSMMTTEMPERATURETRESIDENCETIMEMINAOVERLAPANGLEOFSCREWFIGHTSDEGREESDCALENDERGAPMMESIDECLEARANCEMMQPRODUCTDENSITYG/MM3/HELIXANGLEDEGREESCORRESPONDINGAUTHORFAX01525863277EMAILBCLARKECRANELDACUK02608774/99/SEEFRONTMATTER1999ELSEVIERSCIENCELTDALLRIGHTSRESERVEDPIIS02608774990004971INTRODUCTIONEXTRUSIONCOOKINGISFINDINGEVERINCREASINGAPPLICATIONSINTHEFOODPROCESSINDUSTRYAPARTFROMPROVIDINGAMEANSOFMANUFACTURINGNEWPRODUCTS,ITHASSUCCESSFULLYREVOLUTIONISMANYCONVENTIONALMANUFACTURINGPROCESSESHARLOW,1985,FRAME,1994TODAY,EXTRUDERSCOMEINAWIDEVARIETYOFSIZES,SHAPESANDMETHODOFOPERATIONTHEREARETHREETYPESOFFOODEXTRUDERFOUNDININDUSTRYHYDRAULICRAM,ROLLERANDSCREWTYPEEXTRUDERSFRAME,1994THESCREWEXTRUDERSAREVERYDIFFERENTTOTHEOTHERTWOHAVINGSPECIALFEATURESSUCHASCONTINUOUSPROCESSINGANDMIXINGABILITYSINGLEANDTWINSCREWTYPESAREBOTHWIDELYUSEDINTHEFOODPROCESSINDUSTRYUNFORTUNATELY,MOSTOFTHEFOODEXTRUDERSAVAILABLEINTHEMARKETAREEITHERSOCOSTLYTHATLESSDEVELOPEDCOUNTRIESCANNOTAFFORDTOBUYTHEMEXCEPTBYSOMEFORMOFASSISTANCEOROUTSIDEINVESTMENTORELSEARENOTAPPROPRIATEFORTHEWIDEVARIETYOFMATERIALSTHATNEEDTOBEPROCESSEDASARESULTTHEGROWTHOFEXTRUSIONTECHNOLOGYOFFOODINTOTHESECOUNTRIESHASBEENHINDEREDDESPITEITSMANYADVANTAGESFIG2PLANDRAWINGOFTHETWINSCREWEXTRUDERWITHDRIVESYSTEM1VBELTPULLEY,2GEARBOX,3FOODSEAL,4ANGECLAMPBOLT,5DIEPLATE,6DIE,7TWOSEGMENTSOFTHEEXTRUDERCHAMBER,8EXTRUDERSCREWWEREMADESOTHATTHEYCOULDBEEXTERNALLYSCREWEDTOTHEDIEPLATE25DRIVESYSTEMTHEMACHINEWASDRIVENBYANELECTRICMOTOROF22KWUSINGATWINBELTDRIVEBETWEENTHEMOTORANDAGEARBOXSHOWNINFIG2THESPEEDREDUCTIONINTHEBOXWAS208WHILEANELECTRONICSPEEDCONTROLLERWASUSEDTOCONTROLTHESPEEDCONTINUOUSLYOVERTHERANGEREQUIREDFIG3FRONTPORTIONOFBARRELSHOWINGPROVISIONFORHEATERS,TEMPERATUREANDPRESSURESENSORS1SLOTSFORHEATERS,2ENDFLANGES,3SIDEFLANGESTOBARREL,4HOLEFORPRESSURESENSOR,5TWINHOLESTOFORMTHEBARREL2MOTORPOWERINTWINSCREWEXTRUDERSTHEMOTORPOWERISUTILIZEDMAINLYTOCOMPRESSANDSHEARTHEFOODDOUGHTHATSQUEEZESTHROUGHVARIOUSGAPSINTHEINTERMESHINGSCREWSANDTHEGAPBETWEENTHESCREWSANDTHEBARRELWHENDEALINGWITHAWIDERANGEOFFOODSUNDERDIFFERENTPROCESSCONDITIONSTHESHEARRESISTANCECANVARYWIDELYBECAUSEOFCHANGESINTHERHEOLOGICALBEHAVIOURWHICHWOULDPREVENTACCURATEESTIMATEOFTHEMOTORPOWEROWINGTOTHEUNKNOWNCHARACTERTHEREFOREOFTHENOVELMATERIALSAMOTORPOWERWASSELECTEDBASEDONTHATUSEDFORSIMILARMATERIALSINSIMILARSIZEDEXTRUDERSWITHASAFETYMARGINANDFROMEXPLORATORYTRIALSINTHEBRABENDEREXTRUDERROSSENANDMILLER1973GIVEARANGEOFSPECIFICENERGYCONSUMPTIONFIGURESFORDIFFERENTEXTRUDERSWHICHRANGEDFROM002TO010KWH/KGAT10KG/HTHROUGHPUTTHISGAVEAMAXIMUMPOWERREQUIREMENTOF1KWWHILETHEBRABENDERTRIALSTENDEDTOINDICATEAPOWERREQUIREMENTOFABOUTHALFOFTHISVALUETHE22KW,3PHASEACMOTORUSEDWASAMPLYCAPABLEOFSUPPLYINGTHISPOWERPLUSALLOTHERDRIVEFRICTIONLOSSES3GEARBOXINTHECOROTATINGEXTRUDERTHETWOSCREWSHAFTSAREDRIVENATTHESAMESPEEDINTHESAMEDIRECTIONTHEMAINPROBLEMISTHATTHEYAREVERYCLOSETOGETHERTHEGEARBOXWASDESIGNEDTODRIVETWOPINIONS,COUPLEDTOTHESHAFTSBYSHEARPINS,BYUSINGAGEARWHEELOFMORETHANDOUBLETHEWIDTHOFTHEPINIONSINTHISWAYTHETWOPINIONSCOULDTSIDEBYSIDEDRIVENSIMULTANEOUSLYANDMAXIMISETHEIRDIAMETERSPACEASSHOWNINFIG2LUBRICATEDPHOSPHORBRONZETHRUSTBEARINGSWEREUSEDTORESISTTHEAXIALLOADGENERATEDBYTHEMATERIALALONGTHESHAFT26HEATINGANDTEMPERATURECONTROLHEATINGOFTHEBARRELTOGIVENECESSARYTHERMALINPUTFORCOOKINGTHEFOODWASDONEBYTWOSETSOFCARTRIDGEHEATERSHAVINGCAPACITIESOF800AND1200WTHEHEATERSWEREPOSITIONEDINTHEGROOVESMADEONTHETOPANDBOTTOMOFTHEBARRELTOWARDSTHEDIEENDASSHOWNINFIG3ASINGLETEMPERATURECONTROLLERWASSETUPTOGETHERWITHATHERMOCOUPLETOSENSETHETEMPERATUREINSIDETHEBARRELVERYCLOSETODIEPLATEOWINGTOTHESHORTNESSOFTHEBARRELONLYONETHERMOCOUPLEWASCONSIDEREDNECESSARYINANEARLYDESIGNHEATERSWEREALSOUSEDNEARTOTHEFEEDHOPPERBUTWERENOTUSEDASTHEYTENDEDTOCAUSEPREMATUREGELATINIZATIONOFTHESTARCHANDBLOCKAGEOFTHEFEED4PRESSURESENSORPRESSUREMEASUREMENTSARENOTSOIMPORTANTINTHECOMMERCIALPRODUCTIONPROCESSESASITCANNOTBEDIRECTLYCONTROLLEDTOMONITORTHEPRODUCTCHARACTERISTICSNEITHERWASSUCHADEVICENEEDEDASASAFETYMEASUREASTHISWASCOVEREDBYANOVERLOADCUTOUTONTHEELECTRICALSUPPLYHOWEVER,INEXPERIMENTALWORKTHEMEASUREMENTOFPRESSUREISUSEFULTOASCERTAINTHERELATIONSHIPBETWEENTHEPRESSUREANDTHEOTHERCONTROLLABLEPARAMETERSSUCHASDIESIZE,TEMPERATURE,MOISTURECONTENTANDSPEEDINTHISSTUDY,ADEVICEWASBUILTUSINGSTRAINGAUGESMOUNTEDONASMALLCANTILEVERBEAMINORDERTOMEASURETHEPRESSUREINSIDETHEEXTRUDERBARRELFIG4AFOURARMSTRAINGAUGEBRIDGEWASFIXEDATTHEPOINTOFMAXIMUMBENDINGMOMENTTHEPRESSUREWASTAPPEDFROMASMALLHOLEMADEINTHEDIEENDOFTHEBARRELINWHICHAPLUNGER,SEALEDBYANORING,ACTUATEDTHECANTILEVERBEAMTOTRANSMITTHEPRESSUREFORCETHESTRAININTHEBEAMWASDETECTEDASAVOLTAGEDIFFERENCETHISFEATURECOULDHAVEBEENUSEDASANAUTOMATICSAFETYCUTOUTBUTRELIANCEWASPLACEDINSTEADONBELTSLIPINTHEINITIALDRIVESTAGEANDTHEMOTORITSELFHADANOVERHEATINGCUTOUTFIG4POSITIONOFPRESSUREANDTEMPERATURESENSORSONTHEEXTRUDERBARREL1LOCATIONOFSTRAINGAUGESONTHEPRESSURESENSOR,2CANTILEVERSUPPORTTOPLUNGER,3TEMPERATURESENSOR5TESTINGANDEVALUATIONARANGEOFRICEANDBANANAMIXTURESWERESELECTEDASBEINGBOTHNOVELYETHAVINGHIGHPOTENTIALASPROCESSEDFOODSINSRILANKATHESEMATERIALSARECHEAPANDCOMMONCROPSINMOSTDEVELOPINGCOUNTRIESANDREPRESENTANOPPORTUNITYTOPRODUCEANATTRACTIVE,NUTRITIOUSANDTASTYSNACKFOODTHISWOULDPROVIDELABOUR,UTILISATIONOFEXCESSPERISHABLEFRUITSINSEASONANDAMEANSOFSTORINGTHEMFORATLEASTONEYEARINAPPROPRIATEPACKAGESTHEMAINPRODUCTQUALITIESWEREASSESSEDASPARTOFTHESAMEPROGRAMMEANDSHOWNTOBESATISFACTORYBYGAMLATH1995THERICEWASPREPAREDINTHEFORMOFGRITS800LMANDTHEBANANAWASDRIEDANDMILLEDTOASIMILARSIZEDPOWDERWHICHWASMIXEDANDFLOODFEDFROMTHEFEEDHOPPEREXTRUSIONTRIALSWERECARRIEDOUTASGIVENBELOWSIXTEENCOMBINATIONSOFVARIABLELEVELSWERESTUDIEDINTWOSETSOFEXPERIMENTSINBOTHSETSTHETHROUGHPUTWASMEASUREDWHENTHEFLOWBECAMESTABLEINITIALTRIALSINDICATEDNOSIGNIFICANTDIFFERENCEINPERFORMANCEDUETOTHEVARIABLEPITCHSCREWSASAMEANSOFCOMPRESSINGTHEFEEDSOALLSUBSEQUENTTRIALSANDTHERESULTSQUOTEDINTHISPAPERAREFORTHEFIXEDPITCHSCREWSTHEEXTRUDATEDIAMETERWASMEASUREDUSINGAVERNIERCALLIPERIMMEDIATELYAFTEREXTRUSIONANDBEFOREANYFURTHERDRYINGTOOKPLACEWHICHCOULDCAUSESOMEFURTHERREDUCTIONINRATIOBUTNOTTOAFFECTTHEGENERALRESULTALLTESTSWEREREPLICATEDTHREETIMESMAKING48INDIVIDUALTRIALSCARRIEDOUTINAFULLYRANDOMISEDFORMATEXPERIMENT1FIXEDSETTINGSSPEEDN125REV/MINDIESIZEA5MMDIAMETERVARIABLESBARRELTEMPERATURETTWOLEVELS100CAND120CFEEDMOISTURECONTENTMFOURLEVELS15,20,25,30EXPERIMENT2THISEXPERIMENTWASCARRIEDOUTUSINGFIXEDSETTINGSOFBARRELTEMPERATUREANDTHEFEEDMOISTUREDETERMINEDINEXPERIMENT1ONTHEBASISTHATMAXIMUMPRODUCTEXPANSIONREPRESENTEDTHEBESTQUALITYFIXEDSETTINGSBARRELTEMPERATURET120CFEEDMOISTURECONTENTM156TESTINGANDEVALUATIONARANGEOFRICEANDBANANAMIXTURESWERESELECTEDASBEINGBOTHNOVELYETHAVINGHIGHPOTENTIALASPROCESSEDFOODSINSRILANKATHESEMATERIALSARECHEAPANDCOMMONCROPSINMOSTDEVELOPINGCOUNTRIESANDREPRESENTANOPPORTUNITYTOPRODUCEANATTRACTIVE,NUTRITIOUSANDTASTYSNACKFOODTHISWOULDPROVIDELABOUR,UTILISATIONOFEXCESSPERISHABLEFRUITSINSEASONANDAMEANSOFSTORINGTHEMFORATLEASTONEYEARINAPPROPRIATEPACKAGESTHEMAINPRODUCTQUALITIESWEREASSESSEDASPARTOFTHESAMEPROGRAMMEANDSHOWNTOBESATISFACTORYBYGAMLATH1995THERICEWASPREPAREDINTHEFORMOFGRITS800LMANDTHEBANANAWASDRIEDANDMILLEDTOASIMILARSIZEDPOWDERWHICHWASMIXEDANDFLOODFEDFROMTHEFEEDHOPPEREXTRUSIONTRIALSWERECARRIEDOUTASGIVENBELOWSIXTEENCOMBINATIONSOFVARIABLELEVELSWERESTUDIEDINTWOSETSOFEXPERIMENTSINBOTHSETSTHETHROUGHPUTWASMEASUREDWHENTHEFLOWBECAMESTABLEINITIALTRIALSINDICATEDNOSIGNIFICANTDIFFERENCEINPERFORMANCEDUETOTHEVARIABLEPITCHSCREWSASAMEANSOFCOMPRESSINGTHEFEEDSOALLSUBSEQUENTTRIALSANDTHERESULTSQUOTEDINTHISPAPERAREFORTHEFIXEDPITCHSCREWSTHEEXTRUDATEDIAMETERWASMEASUREDUSINGAVERNIERCALLIPERIMMEDIATELYAFTEREXTRUSIONANDBEFOREANYFURTHERDRYINGTOOKPLACEWHICHCOULDCAUSESOMEFURTHERREDUCTIONINRATIOBUTNOTTOAFFECTTHEGENERALRESULTALLTESTSWEREREPLICATEDTHREETIMESMAKING48INDIVIDUALTRIALSCARRIEDOUTINAFULLYRANDOMISEDFORMATEXPERIMENT1FIXEDSETTINGSSPEEDN125REV/MINDIESIZEA5MMDIAMETERVARIABLESBARRELTEMPERATURETTWOLEVELS100CAND120CFEEDMOISTURECONTENTMFOURLEVELS15,20,25,30EXPERIMENT2THISEXPERIMENTWASCARRIEDOUTUSINGFIXEDSETTINGSOFBARRELTEMPERATUREANDTHEFEEDMOISTUREDETERMINEDINEXPERIMENT1ONTHEBASISTHATMAXIMUMPRODUCTEXPANSIONREPRESENTEDTHEBESTQUALITYFIXEDSETTINGSBARRELTEMPERATURET120CFEEDMOISTURECONTENTM15TABLE1RESULTSOFEXPERIMENT1DIEORIFICEDIAMETER5MM,SCREWSPEED125RPMTEMPERATURECFEEDMOISTURETHROUGHPUTG/SEXPANSIONRATIOPRESSUREMN/M21001537610129710020256100238100252041001831003012510013812015216106291120202001052071202511810115912030102100138VARIABLESDIEORIFICEDIAMETERATWOLEVELS3,4MMSPEEDNFOURLEVELS100,125,150,175REV/MIN4RESULTSANDDISCUSSION41MACHINEPERFORMANCEGENERALLYTHEEXTRUDERPERFORMEDVERYSATISFACTORILYTHEEXTRUDATESPRODUCEDBYTHEMACHINEWEREFAIRLYWELLEXPANDEDDURINGEXTRUSIONOPERATIONSITDIDNOTBECOMENECESSARYTODISMANTLETHEBARRELLENGTHWAYSBYSPLITTINGINTOTWOHALVESASITNEVERSEIZEDUPINORDERTOCLEANTHESCREWANDBARRELTHELATTERBARRELWASVERYEASILYPULLEDOFROMTHESCREWSWITHINAFEWMINUTESAFTEREXTRUSIONTHISWASINPARTDUETOASHORTERTHANUSUALBARRELLENGTHTHISSUGGESTSTHATTHEHORIZONTALSPLITTINGOFTHEBARRELWASNOTESSENTIALWHICHWOULDMAKETHEMACHININGPROCESSOFTHEBARRELFAREASIERNOSERIOUSDIFFICULTIESWEREENCOUNTEREDASFARASTHEOPERATIONOFTHEMACHINEISCONCERNED,EXCEPTINITIALFEEDINGPROBLEMSDUETOATEMPERATURERISECLOSETOTHEFEEDHOPPERTHISHAPPENEDBECAUSESOMEHEATERSWEREINSTALLEDALITTLETOOCLOSETOTHEFEEDPOINTSOTHESEWERELATERREMOVEDANDTHEDIFFICULTIESWEREOVERCOMEASMENTIONEDEARLIERMANYEXTRUDERSHAVECOOLINGFACILITIESINTHISREGIONBUTTHESEWERENOTFOUNDTOBENECESSARYTHOSEHEATERSFURTHERFROMTHEFEEDPOINTANDCLOSETOTHEDIEENDPROVEDTOBESUFFICIENTTOGELATINIZETHERICEGRITSTHEEXTRUDATEWASOBSERVEDTOCHANGEFROMAPOWDERATFEEDTOACONTINUOUS,EXPANDEDEXTRUDATEATEXITALTHOUGHQUANTITATIVEASSESSMENTSOFTHEDEGREEOFGELATINIZATIONWERENOTCARRIEDOUT7EXTRUDERSETTINGSANDPRODUCTCHARACTERISTICSITCANBESEENFROMTABLE1ANDFIG5THATTHETHROUGHPUTDROPPEDWITHEACHINCREASEOFFEEDMOISTURECONTENTATBOTHTHEBARRELTEMPERATURESUSEDWHENTHEFEEDMOISTUREWASINCREASEDFROM15TO30,THETHROUGHPUTWASREDUCEDBY668AND527AT100AND120BARRELTEMPERATURES,RESPECTIVELYTHISEFFECTWASPROBABLYCAUSEDBYANINCREASEINBACKFLOWALLOWEDBYTHEREDUCEDVISCOSITYWHICHTHEINCREASEINMOISTUREPRODUCEDANOTHERIMPORTANTOBSERVATIONMADEWASTHEVARIATIONOFPRODUCTEXPANSIONWITHTHEPRESSUREANDFEEDMOISTURECONTENTTHEEXPANSIONWASFOUNDTOBEHIGHESTATTHELOWESTMOISTURECONTENTWITHASSOCIATEDHIGHESTPRESSURESFIG6ANDASTEADYREDUCTIONINBOTHEXPANSIONRATIOANDPRESSUREASMOISTURECONTENTINCREASEDTHEPRODUCTWASWELLGELATINISEDBUTWITHLOWEXPANSIONRATIOTHESECONDSERIESWASDESIGNEDTOTESTAWIDERRANGEOFPARAMETERSANDIFPOSSIBLEINCREASETHEEXPANSIONRATIOWHICHWASTHOUGHTTODEPENDONTHEDIEDIAMETERTHERESULTSOFEXPERIMENTS2ARETABULATEDINTABLE2BELOWFIG5THROUGHPUTASAFUNCTIONOFFEEDMOISTURECONTENTWITHDIEDIAMETER5MMANDSCREWSPEED125REV/MINFIG6PRESSUREANDEXPANSIONRATIOASAFUNCTIONOFFEEDMOISTURECONTENTATFEEDMOISTURE15,DIEDIAMETER5MMANDSCREWSPEED125REV/MINFIG7ANDTABLE2SHOWTHATTHETHROUGHPUTINCREASEDWITHTHESPEEDDUETOINCREASEDRATEOFMATERIALCONVEYANCETHEPRESSURECHANGESWITHSCREWSPEEDWASNOTFOUNDTOBESIGNIFICANTTHEPRODUCTEXPANSION,HOWEVER,SHOWEDADOWNWARDTRENDWITHTHEINCREASEOFSPEEDASEVIDENTFROMFIG8THISREDUCTIONCANBEATTRIBUTEDTOTHEREDUCTIONOFPRESSUREANDLOWERDEGREEOFGELATINIZATIONDUETOREDUCEDRESIDENCETIMEATSETTINGSOF125RPM,FEEDMOISTURE15,TEMPERATURES120C,DIESIZE3OR4MMDIAMETERAVERYACCEPTABLEPRODUCTWASACHIEVEDTHEOVERALLPERFORMANCEOFTHEMACHINEWASFOUNDTOBEQUITESATISFACTORYINACHIEVINGALLTHEPARAMETERSETTINGSANDMEASUREMENTSREQUIREDEACHTRIALONLYLASTEDAFEWMINUTESINRUNNINGTIMEWHICHWASMAINLYSPENTINREACHINGEQUILIBRIUMCONDITIONSINDICATEDBYTHETEMPERATUREREADINGBUTAFTER48TRIALSNOSIGNIFICANTWEARWASOBSERVEDEVENTHOUGHTHEPROTOTYPEWASINMILDSTEELCLEANINGANDMAINTENANCEWASQUICKANDSIMPLEANDINTHEEVENTOFACOMPLETESEIZUREOFTHESCREWSTHEBARRELCOULDBESPLITONTHISMACHINETHEGEARBOXWASOFABOLTEDCONSTRUCTIONTOPERMITMODIFICATIONSBUTFUTUREDESIGNSSHOULDBEWELDEDTOGETHERTHE22KWMOTORWASFOUNDTOBEAMPLYCAPABLEANDMOSTOFTHETIMEITONLYCONSUMEDABOUT05KWNOMECHANICALBREAKDOWNSWEREEXPERIENCEDTHEPROSPECTSFORUSEOFTHISDESIGNINDEVELOPINGCOUNTRIESSEEMTOBEGOODFROMTHESEEXPERIMENTSSCALEUPTOAHIGHERCAPACITYWOULDBRINGSOMEDIFFICULTIESASDISCUSSEDBYLEVINE1989SINGH,SMITHANDFRAME1998ANDYACU1992ANDALTHOUGHTHESEISSUESWERENOTADDRESSEDTHEYARENOTCONSIDEREDTOBEINSURMOUNTABLEFIG7THROUGHPUTASAFUNCTIONOFSPEEDWITHFEEDMOISTURE15ANDBARRELTEMPERATURE120CFIG8PRESSUREANDEXPANSIONRATIOASAFUNCTIONOFSPEEDWITH3MMDIESIZE,FEEDMOISTURE15ANDBARRELTEMPERATURE120C8CONCLUSIONSTHEFOLLOWINGCONCLUSIONSWEREMADEFROMTHISSTUDYSIMPLIFIEDEXTRUDERSFORSPECIALISEDAPPLICATIONSCANSUCCESSFULLYBEMADEANDOPERATEDINLESSDEVELOPEDCOUNTRIESTOPROCESSLOCALFOODMATERIALSALLCOMPONENTSCANBEMADEINANUNSOPHISTICATEDWORKSHOPEXCEPTGEARS,SEALS,MOTOR,TEMPERATURESENSORANDHEATERSSIMPLEMACHININGPROCESSESSUCHASDRILLINGANDBORINGCANBEUSEDTOPRODUCETWINHOLEDBARRELSTOACCOMMODATETHEINTERMESHINGSCREWSHORIZONTALSPLITTINGOFTHEBARRELISNOTESSENTIALINTHISTYPEOFMACHINESOTHATFABRICATIONOFTHEBARRELFORTHESEMACHINESCANBESIMPLEENOUGHFORDEVELOPINGCOUNTRYMANUFACTUREASIMPLECONSTRUCTIONOFGEARBOX,USINGSTRAIGHTSPURGEARSDRIVENBYASINGLELARGEGEARWHEELISQUITEADEQUATETORUNTHETWINSCREWSINTHESAMEDIRECTIONANATTRACTIVEANDACCEPTABLESNACKFOODWASPRODUCEDFROMTHEPROTOTYPEMACHINEFROMMIXTUREOFCEREALSANDFRUITSREFERENCESFRAME,ND1994THETECHNOLOGYOFEXTRUSIONCOOKINGBLACKIEACADEMICANDPROFESSIONAL,LONDONGAMLATH,GGSG1995NUTRITIONAL,PHYSICOCHEMICALANDSENSORYEVALUATIONOFEXTRUDEDCEREALSWITHPERISHABLESPHDTHESIS,CRANFIELDUNIVERSITY,BEDFORD,ENGLANDHARLOW,N1985REVOLUTIONISINGACEREALNEEDFOODPROCESSING,PP2930HARPER,JM,11523JANSEN,LPB1978TWINSCREWEXTRUSIONAMSTERDAMELSEVIERLEVINE,L1989SCALEUP,EXPERIMENTATIONANDDATAEVALUATIONINCMERCIER,PLINKO接受1999年2月10日摘要一个简化双螺杆旋转食品挤压机的设计，制造和测试在英国，之后在斯里兰卡广泛的测试应用。它是作为一个模式来满足特定的产品和金融限制，较不发达国家，预计将在这些国家扩大生产能力，膨化食品。机器有一个10公斤小时的估计输出而且主要是碳钢所做。螺旋的两类型被做了，一个有固定摊位的14毫米和其他不同的音高段14,12和10MM。这个机器是采用变频电机与电子速度控制。该机也有电加热温度控制器和一个压力感应装置。制造成本的估计2000欧元，大多数部分建立在一个相当简单的工作坊。一个米的混合物和干燥的香蕉成功地当做潜在的点心食物和根据最大展延被挤出，最好的结果从一个120的滚筒式打印机温度被获得，螺旋加速125个转/每分，输送水分15而且与一钢模囗3毫米的尺寸相当。当其它可能的压缩螺旋被测试非常相似的结果与没有产品展延中的重要的改良一起达成。1999全文电子期刊公司。版权所有。关键词双螺杆挤出机，设计低成本，休闲食品，连续蒸煮器，地方建设，谷类混合物1驱动系统这台机器是由电机和齿轮箱之间使用双皮带传动的电动机（220KW）驱动的（图2）。箱子减速器是用电子调控器来达到持续变化范围内的速度的要求的。图2用传动系统的对螺旋挤压机的平面图制图。单一三角皮带滑车2齿轮箱、3食物的封囗，4凸缘夹子螺栓，5一钢模的屏，6一钢模，挤压机室的7两个片段，8挤压机转。（1）电机功率在双螺杆挤出机电机功率的利用主要压缩和剪切食物生面团挤压，通过各种差距在啮合螺丝和螺丝之间的差距和桶。当处理一个范围广泛的食品不同工艺条件下的剪切阻力可能差异很大，因为变化的流变行为，防止准确的电机功率。由于未知的变化和新奇材料等，一个马达的能力被选择了基于一个安全界限和从布拉班德挤压机的探索试验在相似的按规定尺寸制作挤压机中为相似的材料。罗森和铣床为从002到010KWH/KG的不同的挤压机提供多种比能量消费数据。在10KW吞吐量时，这给一个1KW的最大动力要求而布拉班德审讯倾向于表明一个相关的电源要求这个的一半值。22KW，被用的3相位交流电动机加上所有其他磁盘摩擦损失等供给充足有能力。（2）齿轮箱在同向旋转挤压机中，螺旋桥以相同的方向和相同的速度被驱使。主要的问题是他们在一起非常接近。齿轮箱被设计成驾驶两个小齿轮，藉着剪梢对桥加倍了，藉由使用齿轮比倍更多小齿轮的宽度。这样，这两个小齿轮会并排安装并且同时地驱使，如图2所显示的他们的直径空间增加至最大限度被加油的磷青铜推力方位被用来抵抗沿着事物产生的桥方向的负载。2加热与温度控制滚筒式打印机的加热给煮熟食物的必需的热输入分两组卷筒加热器有800W和1200W的容量。加热器在槽向如FIG3所显示的一钢模结束在滚筒式打印机的顶和底上被做中放置。一个温度控制器连同一个热偶一起被建立在滚筒式打印机内温度接近的死屏。由于滚筒式打印机的脆性所以只有一个热偶被视为必需的了。在一个早期设计暖气并且使用靠近进料斗现在不使用是由于他们倾向于原因为时过早糊化的淀粉和阻止费。图3加热器、温度和压力感应器的滚筒成绩准备的前面部分。1为加热器起槽，2结束凸缘，3边凸缘快速前进，4为压力感应器挖洞，5双排电洞造形滚筒式打印机。3压力传感器压力尺寸不是那样重要。在广告生产过程由于这不可能直接控制对显示器的产品特点。当这在电的供给上的外被超载了复盖且剪下的时候,一个不可或缺的装置即一个安全测量也是。然而，在实验的工作中，压力的测量有用确定压力和其他可控制的叁数，像钢模尺寸、温度之间的关系，水分足而且满足加速。在这研究中，一个装置被建造了并且使用在一个小展开的应变计的悬臂梁上为了是要在挤压机滚筒式打印机内有压力（图4）。四个臂应变计桥接器被濒于最大弯曲（力）矩定盘了。压力从一个小电洞，在一个被一个O环封闭的活柱，促使了悬臂梁传送压力的滚筒式打印机的钢模被挖被轻打。波束的应变当做一个电压差额被发现。这特征可能有作为一个自动安全断路器并且被信赖放置代替在皮带打滑在初步驱动器阶段且马达本身有一个过热开孔。图4压力和在挤压机滚筒式打印机上的温度感应器的职务。在压力感应器上的应变计的1位置，2悬臂对活柱，3温度的感应器支援。4测试与评估多种米和香蕉混合物被选择了当做仍然有高电位为斯里兰卡的加工食品。这些材料在大多数发展中国家中是廉宜、通常的农作物和一个机会容易生产吸引人、有营养成份而且好吃的点心食物。这将给劳工过剩的利用易腐烂的水果，储存的一种方法减少他们为至少一年的适当包装。主要的产品性质被估定为相同的程序表的一部份而且显示由GAMLATH变得满意了（1995。米以砂砾（800UM的形式被准备这，而香蕉被弄干而且磨工到一个被混合的相似的按规定尺寸制作粉末了和从输送漏斗被喂的泛光性。挤出试验被实行如给定的变化。易变层次的十六个结合在两组实验中被研究。在两组实验中，当流量变成持稳时，传输量被测量了。初步的审讯表明无重要区别在于可变螺距螺旋由于压缩的一个手段以及所有连串的审讯，结果引用在这篇论文中为固定摊位螺旋。出胶直径被测量了，立刻使用幼频调节器，卡钳在挤出之后而且在任何较进一步的干燥发生时哪一个会在比率中引起一些较进一步的缩减之前但是不影响一般的结果。所有检验在那里被复制时作以一个完全随机化的格式被实行的了48个个别的试验。实验1被定盘的设定速度125R/MIN钢片尺寸5MMDIAMETER变量料筒温度100和12
- 温馨提示:
1: 本站所有资源如无特殊说明，都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
2: 本站的文档不包含任何第三方提供的附件图纸等，如果需要附件，请联系上传者。文件的所有权益归上传用户所有。
3.本站RAR压缩包中若带图纸，网页内容里面会有图纸预览，若没有图纸预览就没有图纸。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 人人文库网仅提供信息存储空间，仅对用户上传内容的表现方式做保护处理，对用户上传分享的文档内容本身不做任何修改或编辑，并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容，请与我们联系，我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
人人文库网所有资源均是用户自行上传分享，仅供网友学习交流，未经上传用户书面授权，请勿作他用。
川公网安备: 51019002004831号