精梳机钳板开口和给棉技术探讨

为了解决精梳机给棉不匀、棉网时疏时密问题,为精梳机开车和新机设计提供参考,对精梳机钳板开口、给棉方式等进行理论分析;剖析前进给棉和后退给棉时,钳板开口调整不精确导致钳板开口比标准值或小或大的原因,在齿轮传动方式和连杆传动方式下调整张力轴偏心齿轮和张力轴偏心旋转角度θ,使钳板开口得以保证。指出:钳板在运动过程中打开和关闭的时机、给棉罗拉给棉长度是影响精梳机开车质量的关键;给棉棘轮的齿数决定每钳次给棉量的长度;由于给棉棘轮的制造误差,导致棉网外观变差;设计和调整时应根据钳板棘轮、棘爪的位置关系和实际情况详细计算调整钳板开口K,并设计调整落棉隔距后钳板开口的调整装置,确保调整后钳板开口一致性,从而使给棉罗拉每钳次能够精确给棉,从根本上保证精梳棉条质量。     

FA261型精梳机钳板的改造

我公司于 1 996年和 2 0 0 0年先后购置了两套FA2 61型精梳机 ,生产过程中我们发现钳板给棉齿轮磨损严重 ,常常因为给棉齿轮磨损造成不给棉而停台 ,严重影响了精梳机的生产效率。我们通过对FA2 61型精梳机钳板组件分析 ,认为磨损原因是给棉罗拉齿轮局部重复接触 ,致使给棉齿轮磨损。我们走访了机器制造厂家并与其合作对FA2 61型精梳机钳板组件进行改造试验 ,将其给棉传动方式由齿轮传动改为棘轮传动 ,同时对原钳板进行修磨。通过 2 0 0 2年 7月至 2 0 0 3年 6月一年时间两套精梳机的运行情况 ,证明改造效果十分明显。改前Uster条干CV值 …     

精梳机钳板开口对精梳条及落棉影响的分析

探讨精梳机钳板开口对精梳条及落棉的影响。阐述了精梳机钳板机构及开口量的变化规律,对HC500型精梳机30分度时不同钳板开口量进行了试验对比分析。结果表明:对HC500型精梳机而言,开口量为5 mm时,精梳条中的棉结较少,棉纤维的损伤和浪费也较少;开口量为4 mm时,棉纤维容易被拉伤;开口量为6 mm时,容易造成可纺棉纤维的浪费。实际生产中,应区分不同精梳机型,对钳板开口量进行试验优选,以达到提高质量、降低生产成本的目的。     

立达精梳机计算机辅助工艺设计与优化分析

介绍了立达精梳机计算机辅助工艺设计与优化技术目标;并从钳板机构运动、偏心轴参数、给棉罗拉位置、分离罗拉运动参数、牵伸机构与牵神工艺配置、钳板组件及锡林组件的质量优化与平衡设计等方面分析了计算机辅助工艺设计与优化技术的内容。指出：由于精梳机结构复杂、速度高及部件之间的配合精度高,在进行新型精梳机设计时利用计算机辅助工艺设计与优化十分必要。立达精梳机通过优化使车速和产量逐步提高,对短纤维适纺性更好,纺纱质量进一步提高。运用计算机辅助工艺设计技术对各部件的运动配合、部件尺寸进行优化、多方案比较是当代精梳机设计的必然趋势。     

精梳机的给棉方式

纺织工艺师们通常认为 :后退式给棉精梳机的效果要比前进式给棉好。因为后退式给棉的每根纤维被梳理 4次 ,而前进式给棉的每根纤维仅被梳理 3次。所以对于后退式给棉的精梳机 ,它的顶梳插入深度也就不需要考虑得太多了。在纺纱加工中 ,精梳是唯一的一道间歇性工序 ,所以精梳中的给棉也是间歇性的。根据给棉时间的不同 ,小卷棉层的给棉方式可以分为两种 :①前进式给棉 ;②后退式给棉。本文分析了两种给棉方式以及它们对精梳效果的影响 ,并对此提出了一些看法。1　给棉方式1 1　前进式给棉当钳板向前摆动时 ,给棉罗拉开始给棉。也就是说 ,给…     

E60型精梳机给棉棘轮的改进

1999年我公司进口了一套瑞士立达公司生产的E60型精梳机,使用至今除给棉棘轮外其余均无故障、无损坏.分析棘轮损坏原因,发现其为塑料类制品,在300钳次/min的高速运行下,棘轮的M8内螺纹失效,造成棘轮在给棉罗拉上打滑,其棘轮齿形仍旧完好,如这样报废实在可惜.     

长绒棉精梳给棉罗拉位置对成纱质量的影响

研究长绒棉精梳落棉隔距及给棉罗拉位置对精梳条及纺纱质量的影响。设计了一种给棉罗拉后移式钳板机构。在其他工艺相同的条件下,利用给棉罗拉后移式钳板机构,在落棉隔距分别为7 mm、9 mm、11 mm时进行了纺纱试验,并与原钳板进行对比分析。结果表明:给棉罗拉后移式钳板机构纺出精梳条总棉结数明显降低,16 mm根数短绒率减少,纱线的常发性纱疵IPI值显著降低,成纱条干CV值等其他指标均有改善。认为:与原钳板相比,给棉罗拉后移式钳板机构能够提高精梳机纺长绒棉的纺纱质量。     

精梳机对纤维长度的适纺性研究

从给棉过程、锡林梳理、分离接合过程等方面研究了精梳机对纤维长度的适纺性，得出了E60型精梳机和E62型精梳机在不同工艺条件下对纤维长度的适纺范围。     

棉精梳机钳板开闭口时间的研究

棉精梳机钳板开闭口时间影响精梳条的质量。为了实现棉精梳机钳板运动的精确控制,确定钳板开闭口时间与工艺参数的定量关系,通过对钳板传动机构、钳板摆轴驱动机构及钳板运动原理的分析,建立了棉精梳机钳板开闭口时间的计算模型,得出影响开闭口定时及闭合时间的因素,并选择分离隔距这一工艺要求进行详细的分析,得到棉精梳机分离隔距这一工艺参数与钳板开闭口时间的定量关系。本研究可为棉精梳机钳板开口控制技术提供参考,为研制高效精梳机提供理论支持。     

金轮科创棉精梳机锡林强度高寿命长 展台号:w2 A10

金轮科创公司将展出新款锡林,它以纺纯棉纤维或棉型化纤为准,棉精梳机锡林工作速度≥350钳次/分;锡林与钳板之间的隔距0.20～0.30 mm;产品上车使用时间终极寿命≥2年。该新款精梳锡林的材质采用进口高碳低合金钢,齿尖硬度达HV800以上,齿部更光滑、耐磨,在高速、重定量喂入时不变形,梳理效果更佳,使用寿命更长;     

采用调线机构针织圆纬机垫纱可靠性分析

本文对采用调线机构的针织圆纬机的垫纱可靠性进行了解析分析,讨论诸因素垫纱参数的影响情况,根据垫纱角的允许范围,确定了喂纱区域,提出了安装尺寸的限制条件。     

Effects of corn grain particle size and treated soybean meal on carcass and meat quality characteristics of beef steers finished on a corn silage diet

Thirty-nine steers were distributed into a 2 × 2 factorial arrangement of treatments to determine the effect of corn grain particle size (cracked [CC] vs ground [GC] corn) and soybean meal treatment (solvent extracted soybean meal [SS] vs lignosulfonate treated soybean meal Soypass™ [SP]) on carcass and meat quality traits. When CC diet was supplemented with SS carcass quality grade score tended to decrease (P = 0.09). GC had no effect on meat quality, while SP only increased the intramuscular fat content when added to CC (P = 0.01). The CC diet supplemented with SP increased the proportion of saturated fatty acids (P = 0.01). Despite the positive effects on carcass quality, the lack of improvement in meat quality and the more saturated fatty acid profile would not justify the use of processed corn or treated soybean meal in the finishing diet of steers.     

手工水饺定量给馅机的设计

手工水饺定量给馅机解决了包制手工水饺的定量给馅问题，保持每个水饺的重量一致稳定。该机采用柱塞泵给馅，气动传动，自动化，高效率，适合工业化生产手工水饺使用。     

山东临沂农村婴幼儿硒营养状况研究

目的:了解农村地区婴幼儿血清硒水平及其与喂养状况关系,为指导婴幼儿合理喂养提供依据。方法:抽取山东临沂某乡镇10个自然村的281名6～36月龄婴幼儿,采集静脉血样,采用电感耦合等离子体质谱法(ICP-MS)测定血清硒浓度,同时调查其喂养情况。结果:被调查儿童的血清硒浓度平均为110.3±27.2μg/L,血清硒水平随月龄增大而增高(P0.001);1岁以下婴儿硒缺乏率(4.4%)高于1岁以上儿童(0.0%)(P=0.02);12月龄内的婴儿中,非母乳喂养儿的血清硒平均水平高于母乳喂养儿,但在校正辅食添加因素后,两种喂养方式间的差异消失。血清硒水平与乳制品、禽肉类和水产品添加频率呈等级正相关(P0.01)。结论:合理的辅食添加对农村婴儿的硒营养状况有重要意义。     

单面氨纶针织物弹性回复率与送纱量关系的探讨

根据实际测试并采用数学回归分析，找出单面氨纶织物弹性回复率与送纱量之间的关系，对实际生产工艺参数的制定具有一定的指导意义。     

The effect of carbohydrates on nutritional preference and development of Mediterranean flour mouth,Ephestia kuehniella Zeller (Lepidoptera: Pyralidae)

In this study, the effect of different carbohydrates on food consumption, growth and development duration of Ephestia kuehniella Zeller (Lepidoptera:Pyralidae) larvae was investigated. 13 diets containing different carbohydrates were prepared. Control diet did not contain carbohydrates. The 8 diet contains 3% concentration of glucose, galactose, maltose, starch, arabinose, mannose, sucrose or fructose. 2 of the diets contains 10% or 30% starch. 2 of the diets contain a mixture of carbohydrates (2 Glucose: 1Fructose; 2 Fructose: 1 Glucose). According to the results, only the increase in food consumption does not indicate that a carbohydrate is a feeding stimulus. The conversion of carbohydrates is also important. Although the dietary consumption of arabinose is high, pupa dry weight, pupa lipid and pupa protein are not high. Conversely, although the consumption of the glucose-containing diet is low, the pupa dry weight and pupa lipid content are high. The glucose-fructose mixture is stimulant for E. kuehniella larvae. G2-F1 diet is the diet with high food consumption and growth performance. In addition, it was determined that as the starch concentration in the diet increased, the amount of consumption increased but the pupa dry weight, which is an indicator of fecundity, decreased. It is important result that the amount of pupa protein does not differ in diets except carbohydrate free diet and G2-F1 diet.     

Effect of inverted saccharose on some properties of honey

In this study, three groups of honey [natural honey; honey produced by the supplementary feeding of bees with saccharose syrup (SSH) and heat and acid (88 °C, 2 h; 0.1% HCl) treated saccharose syrup honey (ISSH)] were produced and physicochemical (water content, pH, free acidity, ash, HMF, diastase activity, sucrose, protein and viscosity), microbiological and sensory properties of these honeys were determined. Also, mineral contents of the honeys were measured. Moisture and ash contents of SSH were higher, acidity level was lower than those of other honeys. The mineral content of natural honey was higher than that of the others, except for Pb and Zn. Diastase activity of ISSH was below the standard limit and HMF content of this honey was high, but not exceeding the limit. Supplementary feeding of honey bees with inverted (acid and heat treatment) saccharose yielded a honey which had a higher HMF content and a lower diastase activity, moisture content and free acidity than natural honey or SSH.     

流加比对双流加糖蜜酒精连续发酵的影响

糖蜜酒精发酵目前多采用双流加连续发酵工艺，其高低浓糖蜜稀释的流加比例对糖蜜连续发酵有重要影响。本文通过糖蜜发酵试验的方式，对不同流加比的投料方式进行简单分析，总结不同流加方式对糖蜜酒精连续发酵的影响。结果表明在相同的平均锤度下，低浓的比例越大时，发酵的时间也越短，出酒率也相对越高。     

Effect of the fattening diet on the development of the fatty acid profile in rabbits from weaning

The effect of the fattening diet on the intramuscular fatty acid composition was studied on a total of 96 hybrid rabbits. Animals were slaughtered at weaning, at 1.6 kg after the consumption for three weeks of various diets containing low (14.28%), medium (18.04%) and high (20.48%) fibre content, and at 2 and 2.30 kg after the consumption of a common non-medicated concentrate, as occurs commercially. Weight had an effect on the percentage of intramuscular fat that decreased as weight increased, as well as on the percentage of most fatty acids except for saturated fatty acids. The percentage of monounsaturated fatty acids increased from weaning whereas polyunsaturated fatty acids subsequently decreased due to a reduction of n-6 fatty acids. In general, diet affected the fatty acid profile in rabbits slaughtered at 1.6 kg, which the rabbits were having exclusively one of the three fattening diets. The finishing common diet seems to reduce most differences due to the growing diet which, if rich in fibre, would produce a more favourable final n-6/n-3 ratio.     

不同喂养方式对婴幼儿肠道菌群多样性影响的研究进展

近些年的研究发现婴幼儿肠道菌群与众多机体的病理相关,其肠道内栖息着数量巨大的微生物,其中占据主导地位的是细菌,其在维持内环境稳态、调节能量代谢等方面发挥着复杂的作用,因此,婴幼儿肠道微生态的合理建立尤为重要。影响婴幼儿肠道菌群的因素有很多,其中喂养方式对婴幼儿肠道菌群结构有明显的影响。关于喂养方式对婴幼儿肠道菌群多样性影响的研究甚少,故本文结合近些年国内外关于喂养方式与婴幼儿肠道菌群的研究,综述了婴幼儿肠道菌群的建立与演替,以及婴幼儿肠道菌群的生理功能,同时,讨论了不同喂养方式(母乳喂养、配方奶粉喂养、混合喂养)下婴幼儿肠道微生态的差异,以期为研发适用于婴幼儿喂养方式的研究中提供一定的理论指导依据。