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1、高剪切式单螺杆挤压机的设计摘要目前膨化食品越来越受到人们的欢迎,而挤压技术在膨化食品中的应用也更加广泛。在挤压机内的面团类食品中的水分由于处于压力之下成液态,然后从模板孔挤出时,过热的水分突然处于常压下,压力突然降低,水分蒸发成水蒸汽,产生伸张的和膨胀,这样使这种产品产生一种低密度轻质的状态。挤压技术作为食品工业中一项非常重要的技术得到更大的发展,现代食品工业用的螺杆挤压机集混合、融合、蒸煮、改性反映、调质、组织化、成型、膨化等多种功能于一身,体现出有利于自动控制、便于灵活转产以及节能、节劳力、
2、节省生产场地等优点。单螺杆挤压机的结构简单、易于加工制造、成本低廉,广泛用于加工各种膨化小吃食品,本设计中设计一台单螺杆挤压机,其特点是高转速,高剪切率,外部无加热和冷却装置,而是利用其高剪切率产生的摩擦热来加热熔融原料使食品原料得到蒸煮熟化,从而生产出松脆可口的膨化谷物食品。设计将从挤压机的传动系统,挤压系统,喂料系统等进行完整的设计。关键词:膨化食品;挤压技术;单螺杆挤压机AbstractAtpresentpuffsfoodmoreandmoretoreceivepeople'swelcom
3、e.Theextrusiontechnologyinpuffsinfoodtheapplicationtobealsomorewidespread.Inextruderpastaclassfoodmoisturecontentbecauseisinunderthepressuretobecometheliquidstate,Thenwhensqueezesoutfromthetemplatehole,thesuperheatmoisturecontentsuddenlyisinunderthea
4、tmosphericpressure,thepressurereducessuddenly,Thepressurereducessuddenly,themoistureevaporationsteam,producespromotesandtheinflation,likethiscausesthisproducttohaveonekindoflowdensitylightqualityconditionTheextrusiontechnologytookinthefoodindustryane
5、xtremelyimportanttechnologyobtainsabiggerdevelopment,Modernfoodindustrialusedscrewrodextruderhavethemix,thefusion,thesteamboiling,themodificationreflected,thequenchingandtempering,theorganization,theformation,puffandsoonmanykindsoffunctions,manifests
6、isadvantageoustotheautomaticcontrol,isadvantageousforproducesadifferentproductnimblyaswellastheenergyconservation,thefestivallaborforce,savesproducesmeritsandsoonlocation.Thesinglescrewextruderstructuresimple,easytoprocessthemanufacture,thecostisinex
7、pensive,widelyusesinprocessingeachkindtopuffsnackfood,Inthedesigndesignsasinglescrewrodextruder,itscharacteristicisthehighspeed,highcuttingrate,theoutsidedoesnothavetheheatingandthecoolingsystem,butisusesthefrictionheatwhichitshighcuttingrateproduces
8、toheatupthefusingrawmaterialenablefoodrawmaterialtoobtainthesteamboilingcuring,thusproducesthepinecrisplydelicioustopuffgrainfood.Thedesignfromtheextrudertransmissionsystem,theextrusionsystem,willfeedthematerialsystemandsoontocarryontheintegritythede
