編號無錫太湖學院畢業設計（論文）題目：高剪切式單螺桿擠壓機設計信機系機械工程及自動化專業學號：學生姓名：指導教師：（職稱：副教授）2013年5月25日無錫太湖學院本科畢業設計（論文）誠信承諾書本人鄭重聲明：所呈交的畢業設計（論文）高剪切式單螺桿擠壓機設計是本人在導師的指導下獨立進行研究所取得的成果，其內容除了在畢業設計（論文）中特別加以標注引用，表示致謝的內容外，本畢業設計（論文）不包含任何其他個人、集體已發表或撰寫的成果作品。班級：機械94學號：0923202作者姓名：2013年5月25日II摘要目前膨化食品越來越受到人們的歡迎，而擠壓技術在膨化食品中的應用也更加廣泛。在擠壓機內的面團類食品中的水分由于處于壓力之下成液態，然后從模板孔擠出時，過熱的水分突然處于常壓下，壓力突然降低，水分蒸發成水蒸汽，產生伸張的和膨脹，這樣使這種產品產生一種低密度輕質的狀態。擠壓技術作為食品工業中一項非常重要的技術得到更大的發展，現代食品工業用的螺桿擠壓機集混合、融合、蒸煮、改性反映、調質、組織化、成型、膨化等多種功能于一身，體現出有利于自動控制、便于靈活轉產以及節能、節勞力、節省生產場地等優點。單螺桿擠壓機的結構簡單、易于加工制造、成本低廉，廣泛用于加工各種膨化小吃食品，本設計中設計一臺單螺桿擠壓機，其特點是高轉速，高剪切率，外部無加熱和冷卻裝置，而是利用其高剪切率產生的摩擦熱來加熱熔融原料使食品原料得到蒸煮熟化，從而生產出松脆可口的膨化谷物食品。設計將從擠壓機的傳動系統，擠壓系統，喂料系統等進行完整的設計。關鍵詞：膨化食品；擠壓技術；單螺桿擠壓機IVAbstractAtpresentpuffsfoodmoreandmoretoreceivepeople'swelcome.Theextrusiontechnologyinpuffsinfoodtheapplicationtobealsomorewidespread.Inextruderpastaclassfoodmoisturecontentbecauseisinunderthepressuretobecometheliquidstate,Thenwhensqueezesoutfromthetemplatehole,thesuperheatmoisturecontentsuddenlyisinundertheatmosphericpressure,thepressurereducessuddenly,Thepressurereducessuddenly,themoistureevaporationsteam,producespromotesandtheinflation,likethiscausesthisproducttohaveonekindoflowdensitylightqualitycondition.Theextrusiontechnologytookinthefoodindustryanextremelyimportanttechnologyobtainsabiggerdevelopment,Modernfoodindustrialusedscrewrodextruderhavethemix,thefusion,thesteamboiling,themodificationreflected,thequenchingandtempering,theorganization,theformation,puffandsoonmanykindsoffunctions,manifestsisadvantageoustotheautomaticcontrol,isadvantageousforproducesadifferentproductnimblyaswellastheenergyconservation,thefestivallaborforce,savesproducesmeritsandsoonlocation.Thesinglescrewextruderstructuresimple,easytoprocessthemanufacture,thecostisinexpensive,widelyusesinprocessingeachkindtopuffsnackfood,Inthedesigndesignsasinglescrewrodextruder,itscharacteristicisthehighspeed,highcuttingrate,theoutsidedoesnothavetheheatingandthecoolingsystem,butisusesthefrictionheatwhichitshighcuttingrateproducestoheatupthefusingrawmaterialenablefoodrawmaterialtoobtainthesteamboilingcuring,thusproducesthepinecrisplydelicioustopuffgrainfood.Thedesignfromtheextrudertransmissionsystem,theextrusionsystem,willfeedthematerialsystemandsoontocarryontheintegritythedesign.Keyword:euffsfoodextrusiontechnologysinglescrewextruderV目錄摘要.....................................................................IIAbstract....................................................................IV目錄......................................................................V1緒論......................................................................11.1擠壓技術介紹..........................................................11.1.1擠壓技術在食品生產中的應用.........................................11.1.2擠壓技術在食品生產中的發展狀況.....................................11.1.3擠壓機生產膨化食品................................................11.1.4擠壓膨化原理.......................................................21.2意義、目的、研究范圍..................................................21.3本課題在國內外的發展概況及存在的問題......................................................................21.4本課題研究內容........................................................52單螺桿擠壓機整體設計方案..................................................62.1擠壓機的主要部件.......................................................62.1.1擠壓機的供料部件...................................................62.1.2螺桿...............................................................62.1.3機筒...............................................................62.1.4模頭及模板.........................................................62.1.5其他...............................................................72.2擠壓機的驅動裝置.......................................................72.2.1電動機的選用.......................................................72.2.2傳動比分配.........................................................83擠壓機零部件設計與計算....................................................93.1螺桿的設計............................................................93.1.1螺桿的結構.........................................................93.1.2螺桿各部分參數.....................................................93.2機筒結構設計.........................................................123.3帶輪結構設計與計算...................................................124螺桿和機筒強度計算及配合要求.............................................164.1螺桿強度計算.........................................................164.1.1螺桿材料選取......................................................164.1.2螺桿校核計算......................................................164.2機筒強度校核.........................................................185軸承布置與校核計算.......................................................205.1徑向軸承.............................................................205.2推力軸承.............................................................21