【正文】 D — 螺桿外直徑， cm n — 螺桿轉(zhuǎn)速， r/min ? — 經(jīng)驗(yàn)出料系數(shù)，取 ? =～ 取 Q =100， ? = 得 SD =106mm L/ SD 的確定：在其它條件一定時(shí)，增大長(zhǎng)徑比，即等于增加螺桿的長(zhǎng)度。 圖 5 擠絲螺旋示意圖 JNA 型自熟式米粉擠絲機(jī) 8 這樣，物料在筒體內(nèi)的滯留時(shí)間要相對(duì)長(zhǎng)一些，對(duì)物料起到很好的揉捻、擠壓作用，排除淀粉中的氣泡，使淀粉結(jié)構(gòu)緊密，擠出來(lái)的米粉條表面光滑、透明。太生時(shí)，擠出來(lái)的米粉條韌性差、斷條率高、吐漿值大（即米粉條在烹調(diào)過(guò)程中淀粉溶解于水中的比值 ） 。配套電機(jī)為 P=15～ 22kw,n=1470r/min。干米粉加水量小于 45%時(shí) ,米粉條的容積密度、蒸煮增重隨加水量減小而減小 ,蒸煮損失則緩慢減少。 米粉條生產(chǎn)的理論基礎(chǔ) 各種 米粉條，雖然成品造型各異，風(fēng)味口感不盡相同，生產(chǎn)工藝和設(shè)備千 差萬(wàn)別，但制作的機(jī)理都是一樣，都是大米淀粉糊化、回生的過(guò)程，有些也許只有一個(gè)糊化過(guò)程。大力發(fā)展米粉條生產(chǎn)，把人們不愿食用的早秈深加工成米粉條，其經(jīng)濟(jì)效益好，市場(chǎng)前景廣闊。我們相信經(jīng)過(guò)廣大技術(shù)人員的通力合作，我國(guó)食品加工機(jī)械的技術(shù)水平必將跨入世界先進(jìn)行列。了解了設(shè)計(jì)的總體結(jié)構(gòu)和主要零件的作用。 JNA 型自熟式米粉擠絲機(jī) ii Abstract Flour machine is a kind of squeeze rice into a rice processing of the food processing machinery and equipment. Extrusion of rice flour has a wide range of machine models, JNA type is a better use of the effect of equipment. I am the subject of this graduation project is to design a selfJNA squeeze cooked rice machine type. It is divided into the working process of maturation and a twostage extrusion molding silk. During the graduation project, the analysis of selfJNA squeeze cooked rice wiretype working principle, the main pulley speed to plete a large calculation, the aging and crowded spiral helical wire speed required. Understanding of the design of the overall structure and the role of the main parts. Barrel aging aging in place there is the role of spiral from aging, overcrowded wire cylinder has put squeeze squeeze wire spiral wire from the role, adjusting the control valve can be be of good quality rice. Aperture of a different powder materials can be a variety of rough mirror, fine rice varieties article. Drawing the main parts drawing and assembly drawing. Keywords: pulley, cylinder ripening, aging spiral, crowded wire cylinder, crowded spiral wire, transmission pipe, control valve, a material powder mirror. JNA 型自熟式米粉擠絲機(jī) iii 目 錄 1 緒 論 ................................................... 1 引言 ...................................................... 1 米粉條加工業(yè)的發(fā)展方向 .................................... 1 米粉條生產(chǎn)的理論基礎(chǔ) ...................................... 2 水分含 量和出料粉鏡的孔徑對(duì)米粉條品質(zhì)特性的影響 ............. 3 2 總體方案確定 .............................................. 4 技術(shù)要求 ................................................... 4 設(shè)計(jì)要求 ................................................... 4 電動(dòng)機(jī)的選擇 ............................................... 4 基本原理 ................................................... 4 工藝流程 ................................................... 6 工藝要求 ................................................... 6 基本結(jié)構(gòu) ................................................... 6 3 設(shè)計(jì)與計(jì)算 ................................................ 9 皮帶傳動(dòng)的設(shè)計(jì)計(jì)算 ......................................... 9 各軸的轉(zhuǎn)速 ................................................ 10 螺桿結(jié)構(gòu)設(shè)計(jì) .............................................. 10 主要參數(shù)確 定 ???????????????????? 10 螺紋形狀確定 ???????????????????? 11 機(jī)筒結(jié)構(gòu)設(shè)計(jì) .............................................. 12 機(jī)筒結(jié)構(gòu)分類 ???????????