制粉工艺与设备的创新设想（二）——辊式磨粉机能否被取代

辊式磨粉机在小麦制粉一百多年发展历史中一直占据无可争辩的主导地位。制粉科技的发展,使得辊式磨粉机的某些不适应小麦制粉需求的缺陷或不足逐渐显现,撞击磨粉机等设备的优势也逐渐显现。种种迹象表明,辊式磨粉机在小麦制粉中的主导地位被取代的趋势正在逐步形成。     

制粉工艺与设备的创新设想(二)——辊式磨粉机能否被取代

辊式磨粉机在小麦制粉一百多年发展历史中一直占据无可争辩的主导地位.制粉科技的发展.使得辊式磨粉机的某些不适应小麦制粉需求的缺陷或不足逐渐显现,撞击磨粉机等设备的优势也逐渐显现.种种迹象表明.辊式磨粉机在小麦制粉中的主导地位被取代的趋势正在逐步形成.     

创新工艺与设备可行性论证(二)——撞击与研磨机理和实用技术对比分析

从机械原理和实用技术角度对撞击磨粉机和辊式磨粉机进行对比分析,一方面是要证明撞击磨粉机是当之无愧的研磨设备,另一方面还要证明撞击磨粉机具有的某些优势很有可能弥补辊式磨粉机的先天不足,在小麦制粉行业技术进步中发挥举足轻重的关键作用.     

创新工艺与设备可行性论证（二）——撞击与研磨机理和实用技术对比分析

从机械原理和实用技术角度对撞击磨粉机和辊式磨粉机进行对比分析，一方面是要证明撞击磨粉机是当之无愧的研磨设备，另一方面还要证明撞击磨粉机具有的某些优势很有可能弥补辊式磨粉机的先天不足，在小麦制粉行业技术进步中发挥举足轻重的关键作用。     

辊式磨粉机的现代设计及进步

主要对目前比较先进的辊式磨粉机及其结构设计采用的一系列新技术进行了阐述，分别从进料控制、辊子自动调整、辊子打包、卫生设备、材料使用等方面做了介绍。同时提出了新的辊式磨粉机的设计理念，为今后辊式磨粉机的设计打下了基础。     

辊式磨粉机的现代设计及进步

主要对目前比较先进的辊式磨粉机及其结构设计采用的一系列新技术进行了阐述,分别从进料控制、辊子自动调整、辊子打包、卫生设备、材料使用等方面做了介绍。同时提出了新的辊式磨粉机的设计理念,为今后辊式磨粉机的设计打下了基础。     

辊式磨粉机长齿齿轮传动的优化设计

提出了一种用于辊式磨粉机辊间传动的长齿渐开线齿轮的优化设计数学模型,并对辊径２５０ｍｍ磨粉机的辊间齿轮传动进行了优化计算。结果表明,采用本方方法所设计的齿轮,与进口辊式磨粉机上所采用的长齿齿轮的实测结果基本一致。     

辊式磨粉机辊间长齿齿轮传动的优化设计

提出了一种用于辊式磨粉机辊间传动的非标准、长齿渐开线齿轮参数的优化设计数学模型，并对辊径２５０毫米辊式磨粉机的辊间齿轮传动进行了优化计算。结果表明，采用本文论述的方法所设计的齿轮，与进口辊式磨粉机所采用的辊间长齿齿轮传动的实测结果基本一致。     

磨粉机小麦研磨长度分析计算及实验研究

磨粉机的小麦研磨长度,即麦粒在研磨时间内,快辊超前小麦所走的距离和慢辊滞后小麦所走的距离之和。磨粉机小麦的研磨长度与快慢磨辊的直径、快慢辊的转速、转速差及麦粒大小有关。通过辊式磨粉机的小麦研磨实验,进一步明确小麦的研磨长度,为新型磨粉机的设计提供了理论参考依据。     

磨辊辊面温度测量试验及辊体温度场有限元分析

针对布勒MDDK1000/250型辊式磨粉机1M喷砂辊快辊进行了辊面温度测量及温度场仿真分析,试验结果显示自磨粉机开始工作时起,辊体内外温差逐渐缩小,后期辊体升温速率加快并渐趋平衡,至76℃达到稳态;仿真结果显示自磨粉机开始工作时起,辊体内外温差逐渐缩小,至80℃左右达到稳态,辊面温度变化呈现先快后慢的趋势,随着辊面温度逐渐达到稳态,磨粉机整体的温度场基本保持稳定。测量点温度相差不大,辊体温度基本均匀,磨粉机的等温性能较好。研究结论对辊式磨粉机的设计以及磨辊内在组织结构研究提供了理论依据。     

国外面粉加工新设备和新技术的应用

叙述了最近几年国外磨粉加工设备的发展、变化和采用新技术的情况。目前国外一些大公司部在积极地设计和开发新的加工设备，均使用了新的技术和新的材料，以满足市场不断发展的需要。技术的创新和应用主要是在磨粉机、磨辊、着水机、分离筛、在线面粉生产监控、高方筛和清粉机等设备方面．     

国外面粉加工设备的发展

叙述了近几年国外磨粉加工设备的发展和变化,主要介绍了着水机、分离筛、高方筛、磨粉机、在线面粉生产监控等方面先进技术的利用,以供选用参考.     

辊式磨粉机磨辊的受力计算和强度分析

针对目前磨粉机的设计大多根据经验进行,缺乏工作状态的基础设计数据的状况,通过研究辊式磨粉机磨辊动力传递的规律,分析计算了磨辊的受力情况;运用有限元分析软件ANSYS建立了磨辊的物理分析模型,并进行了强度计算分析,结果显示了磨辊在稳态工作状态下的应力应变情况.     

MULTIPLE SIEVE SIFTER PERFORMANCE USING VARIOUS COMBINATIONS OF FEED RATES,CIRCLES AND SPEEDS1

Wheat was ground on a rollermill then sifted into several size classifications to determine how certain sifting characteristics changed when the material was subjected to changes in feed rate, sifter circle or throw and sifter speed. The travel speed of the stocks over the sieves decreased with a decrease in average particle size. Changes in the rate of feed to the sieves had no effect on the stock travel time. Travel speed was increased for all stocks when the linear cloth speed of the sieve was increased. Sifter efficiency, as defined by the percent of undersize material removed by each sieve in a series of sieves having the same cloth aperture, compared to the amount of undersize material going to the first sieve of the series was influenced by changes in feed rates and in sifter dynamics. Particle size analysis of individual sieve throughs showed that when the stocks were sifted on a series of sieves having the same aperture opening size, the finest material was sifted out on the first sieve with subsequent sieve throughs becoming progressively coarser.     

产生POY毛丝的设备因素

针对ＰＯＹ丝生产过程中出现的毛丝现象作了探索，通过对卷绕成形全过程的仔细观察研究．认为在原材料质量指标符合要求．工艺稳定成熟的情况下，毛丝产生的主要原因应从设备因素考虑，从而找出解决生产中出现毛丝的办法：     

油炸用油劣变的因素与延缓酸败的方法

分析了油炸用油劣变的现象以及引起油炸用油劣变的因素，并提出了防止或延缓其变质的方法。     

粮油工程决策的模糊综合评判

运用模糊数学理论,分析了粮油工程决策中的模糊性现象,探讨了模糊数学在粮油工程决策中的应用,研究了粮油工程决策的模糊性与数学化趋向。通过对市场预测、效益预测、技术可行性、环境情况等诸影响因子的分析与选择,证明了粮油工程决策是能够用模糊综合评判理论来研究和处理的。     

FDY检验流程优化

对原有FDY检验流程进行优化,结果显示,经流程优化后,FDY产品的外观漏检情况明显好转,减少客户关于FDY产品质量的投诉,成功解决现场外检堵丝、织袜空闲的现象。     

BASIS OF STABILITY OF AMINE SALTS OF LINOLEIC ACID

SUMMARY— The mechanism and generality of the known stabilization against autoxidation conferred on linoleic acid by certain basic amino acids, such as lysine and arginine, was investigated. Basic amino acids were the only class of compounds found to confer the effect. However, the smallest basic amino acid, 2,3-diaminopropionic acid, was not effective, nor was αβω-diaminc acid, 3,6-diaminohexanoic acid, although a simple isomer of lysine. The stabilization was observed only in the solid phase. Inclusion of sodium chloride in the solid matrix was deleterious to the effect. A large number of physical and chemical observations were made and correlated but it has not been possible to draw detailed conclusions about the mechanism of stabilization, nor can a detailed structure of the stabilized complex be suggested. The cause of the phenomenon appears to be closely associated with the physical arrangement of the ions in the crystal lattice.     

ASSESSMENT OF AN EXPONENTIAL MODEL FOR ULTRAFILTRATION OF APPLE JUICE

The clarification of apple juice by ultrafiltration has been commercially used for many years. A common phenomenon in membrane processes is the decline of permeate flux (J) with time (t), called “membrane fouling.” The phenomenon of membrane fouling is very complex and difficult to describe theoretically, and model studies are limited. A number of semiempirical and empirical models have been proposed to explain flux behavior during membrane filtration processes. Using these models, typical t versus J curve observed in membrane filtration applications was examined in two or three periods. However, the boundaries between each period could not be accurately determined and were specific to the system under investigation. Thus, these semiempirical and empirical models are valid only for the system investigated. In this article, the applicability of an exponential model to ultrafiltration of apple juice was studied. The results showed that the exponential model can be successfully applied to analyze the raw filtrate volume V versus t data of ultrafiltration of apple juice, and initial flux J₀, membrane resistance R_m and exponential fouling coefficient k values can easily be determined from the raw data.