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辊式磨粉机(或粉碎机)在饲料厂和面粉厂得到广泛使用。粉碎过程的各个步骤都采用一对水平安装的磨辊。两个磨辊并排装置,轧点处留有适当的间隙两磨辊相向转动——左边的磨辊顺时针方向转动而右边磨辊为逆时针方向转动—物料从上方落入轧点。轧点处的研磨作用取决于磨辊和物料的特性、轧点处轧距的大小以及磨辊的转速。在面粉厂,各道工序采用1台辊式磨粉机,研磨过程重复多次。磨粉机也可用 相似文献
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通过分析磨粉机在皮磨系统研磨物料粒度与齿型参数的关系,确定邦德理论更适用磨粉机功耗关系研究。将粒径等参数带入邦德公式可知,功耗的影响因素与齿型、物料特性、磨辊速度、辊长、轧距、研磨时间和研磨前后的颗粒粒径有关。以Ⅰ~Ⅰ皮磨系统为研究对象,取轧距分别为0.8、0.6、0.4、0.2 mm,并做适当简化,运用Matlab绘出皮磨系统的功耗与齿深的关系图。由图可知,功耗随着齿辊磨损而逐渐增大。当磨损达到一定程度时,功耗变化急剧增大。由于功耗是评判磨辊是否需要拉丝或更换的重要指标,根据邦德定理从理论角度建立磨粉机功耗数学模型,为进一步研究齿辊磨损寿命与能耗关系提供理论参考。 相似文献
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正一个好的磨工要熟悉制粉工艺流程,制粉设备的工作性能,电路气路的基本工作原理等,才能保证车间的正常生产与产品质量稳定。1)研磨操作要点①喂料是磨粉机研磨的第一环节,物料必须均匀的分配到磨辊长度上,比较薄的料流入磨辊的轧距内。物料若没能沿辊长均匀分布,不但会降低研磨效果,而且磨辊易产生磨损。皮磨的物料粗大,呈大片状,流动性差易结拱,可调节拉力弹簧,使皮磨物料在料筒内保持一定的高度,心渣磨物料呈现颗粒 相似文献
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以中强筋小麦为原料,调节磨粉机磨辊轧距以得到不同的预皮磨剥刮率,研究预皮磨不同轧距处理对小麦表面杂质、出粉率及面粉质量的影响。结果表明:预皮磨剥刮率随着轧距的减小显著升高;在一定的范围内随着预皮磨轧距的减小,小麦容重、表面呕吐毒素和微生物显著降低,预皮磨磨后筛下细物料的水分含量、白度逐渐增大,灰分含量、呕吐毒素、微生物逐渐减小,预皮磨对小麦籽粒达到了清理的效果;与未经预皮磨处理的小麦相比,随着轧距的减小,磨后麸皮中大片状麸皮占比和总出粉率先升高后降低,小麦粉的灰分含量先降低后升高,白度先升高后降低,湿面筋含量升高,破损淀粉含量降低,预皮磨的轧距在2.4 mm 时可以在提高出粉率的同时改善小麦及小麦粉的品质。 相似文献
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磨辊直径为300mm与250mm两种磨粉机性能之比较 总被引:1,自引:0,他引:1
从磨粉机的发展历史来看 ,早期磨粉机的磨辊直径为 2 2 0mm的居多 ,后经过长期生产实践和技术改进证明直径为 2 5 0mm磨辊的磨粉机 (以下简称 2 5 0磨 )研磨效果较好 ,并赢得了大部分面粉厂家的认可。而近年来磨辊直径为 3 0 0mm的磨粉机 (以下简称 3 0 0磨 )开始走俏 ,但许多面粉厂家对 3 0 0磨还只是初步了解 ,但对其技术性能及特点认识不太全面。现就两种直径的磨粉机的性能特点做一探讨。1 从磨辊研磨区的长度论 3 0 0磨的研磨效果优于 2 5 0磨如图 1所示 ,磨粉机的研磨区长度为物料落入两辊之间 ,从两辊夹住物料开始对物料进行破碎剥… 相似文献
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B Novales S Guillaume M F Devaux M Chaurand 《Journal of the science of food and agriculture》1998,78(2):187-195
The objective of this work was to characterise the particle size of milling products by image analysis. Four classes of milling products were obtained by varying the roll gap of the second break roll of the mill. Images were acquired by using an in-flow imaging system implemented in the mill, and 1300 images were recorded for each class. Three methods of image analysis were investigated: morphological opening, constant grey level run lengths and grey level spatial interdependences. Discriminant analyses were applied to the data extracted from the images by the three methods in order to identify each class of milling product. More than 77% of the samples were correctly assigned to their group, both for the calibration and validation sets. The best results were obtained by applying morphological openings or by computing parameters from the co-occurrence matrices. The number of correct classifications rose to 81% of samples with only three variables selected for the opening curves and to 83% with three co-occurrence parameters. © 1998 Society of Chemical Industry 相似文献
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Brian G Osborne Alireza Laal-Khoshab 《Journal of the science of food and agriculture》1989,47(1):95-100
The iron, copper, zinc, manganese, chromium, nickel, selenium, protein and ash contents of two different bread grists and flour samples from the first to fourth break and A to J reduction systems of a commercial flour mill were determined. Iron, zinc, manganese and selenium levels followed the trend of ash and protein with the lowest from the A, B and C rolls and highest from either the fourth break or J roll. Copper and chromium levels were relatively homogeneous among the grist and mill streams while for nickel there was only a slight increase through the break and reduction systems. 相似文献
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针对目前国内复卷机退纸辊电机配置普遍偏高的问题,介绍了退纸辊电机在调速范围、额定功率、额定转矩和断纸停机时间等方面的选型依据。并以山东某纸厂复卷机为例,采用恒转矩调速与恒功率调速相结合的调速方式,给出了退纸辊电机选型所需参数的计算方法,提出了降低退纸辊电机配置的2种选型优化方案。 相似文献
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高速线材原孔型系统主要有Ф5.5,6.0,6.5 mm 3个系列,导致轧制工艺参数不一致,增加轧辊、导卫和轧槽更换次数。通过孔型通用化设计,中轧、预精轧机组9H~17H孔型系统按现高线Ф6.0 mm孔型系列设计;精轧机组18#~26#孔型系统采用轧钢厂现有高线Ф6.0 mm孔型系列,但对26#孔型进行了改进;精轧机组27#~28#孔型系统仍采用轧钢厂现有高线Ф5.5,6.0,6.5 mm孔型系列。采用通用孔型系统对ER70S-6产品Ф5.5 mm规格进行试轧,预精轧、精轧机组料型控制不合理,精轧辊缝值偏小,多个机架辊缝值仅0.2~0.6 mm。对18#~26#孔型进行改进,采用改进后的通用孔型轧制的Ф6.5,8.0 mm HPB235盘条和Ф6.0 mm HRB400螺纹钢筋力学性能均满足GB 1499.2—2007的要求,每年可节约备件费用500万元,提高生产效率。 相似文献
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This study was focused on multigrain flours consisting on wheat-rye-triticale and wheat-rye-hulled oat, obtained by using an experimental Buhler roller mill after blending the cereals at different levels. For all investigated multigrain blends the extraction yield of the first reduction passage was lower compared to wheat. The flour yields at the break roll passages decreased in the flowing order: blends with triticale, wheat and blends with hulled oat. The multigrain milling resulted in increased ash, crude fiber and fat contents, and decreased protein content compared to wheat. The solvent retention capacity profile varied with the type of blend, and important correlations were established with Mixolab parameters, mainly related to starch gelatinisation and breakdown. Texture measurements performed on breads prepared with multigrain flours indicated increased hardness and decreased springiness values with increasing the wheat substitution level. These results might allow better exploitation of different cereals through the efficient milling of multigrain blends.Industrial relevance textMultigrain milling could be a way to improve the milling quality and performance of some cereals like triticale, hulled oat and hulled barley. Blending these cereals with wheat in different ratio followed by milling with roller mill can result in multigrain flours with different extraction rate and functional profile. Multigrain flours or some mill streams can be used for obtaining particular baked products. 相似文献
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对辊式磨粉机喂料系统的相关技术问题进行了比较全面深入的分析,对比自动调节料门开度和自动调节喂料辊转速两种伺服喂料提出了与传统观念不同的新看法,提出了考虑空气阻力时喂料轨迹的计算方法和相关的计算公式,分析了气流加速喂料的工作原理. 相似文献
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该文提出旋筛式碾米机碾辊动平衡故障灰色关联分析诊断模型,针对A型灰色关联分析模型和B型灰色关联分析模型存在问题,采用灰色混合关联度模式,以加权方法将二者有机结合起来;选择碾辊振动信号中恰当时域和频域参数为故障特征参数,通过比较检测状态模式与标准故障模式关联度判别碾辊动不平衡故障,诊断方法简单方便,结果准确可靠。 相似文献