纺丝电锭节电关键是配用符合国标的高效率电动机

纺丝电锭是粘胶长丝纺丝机专用小电动机：三相异步，额定功率160W，额定电压150V，额定频率150Hz，立式安装，防护等级IP54。每台纺丝机装锭数为48—77只不等。每家上规模的粘胶长丝生产企业的电锭拥有量都是数以万计，年连续工作时间都在7000h以上，加上需要有等量的电源设备将工频电转换成中频电，也相应带来了不少的能量损耗。所以，有些粘胶长丝生产企业的电锭系统的耗电量竞占了企业全部电能消耗量的三分之一以上。     

风叶碰断检修法

修理鸿运扇常遇到塑料风叶折断的情况。起初我采用的是粘胶或补接法，但效果欠佳。后来我受三片风叶的启发，干脆锯掉其中的残片和对应片。方法简单效果较好。     

西门子SE70系列变频器维修实例

针对化纤行业粘胶短纤维生产线纺丝机、牵伸机上使用的西门子6SE70系列变频器,在应用过程中出现各种故障报警的维修实践经验,加以总结和概括,供有关维修人员在维修变频器时借鉴.     

6SE70系列变频器的故障维修

我公司生产线上共使用西门子变频器260多台。由于粘胶短纤维生产现场硫化氰腐蚀性气体含量比较高,对变频器电路板上的贴片元器件腐蚀较大,且贴片元器件的功率较小,受周围环境温度影响,散热不太好,生产中维修量很大,变频器出现的各种故障报警现象也很多。下面以西门子6SE70系列变频器为例,对有代表性的故障现象进行分析,供参考。     

高分子粘胶在继电器生产中的应用

人类应用粘胶已有五千多年的悠久历史,但是只有在生产高分子粘胶后,才开辟了工程应用的前景。 利用高分子粘胶进行物件连接的技术与其它物件连接技术、螺纹连接、焊接、铆接、嵌接等相比较,具有明显的优点: 它对材料的适应性广,无论是金属与金属、金属与非金属、非金属与非金属之间都可用粘接达到连接的目的,粘接还可以连接多种弹性模量和厚度相差悬殊的材料,高分子粘胶品种繁多,性能各异,可供选择,使用极其方便,无需特殊设备;     

吸油烟机钢化玻璃粘胶对其自爆影响的力学分析

对吸油烟机钢化玻璃粘胶按压过程进行力学分析,利用弹性力学知识进行理论计算,分析其对钢化玻璃发生潜在爆裂危险的影响。结果表明,硅酮胶完全能够将钢化玻璃很好地粘合平整而不会出现脱胶现象。钢化玻璃在按压粘胶工序中,钣金的扭曲对钢化玻璃影响较小,几乎可以忽略不计,远远不足以使其发生爆裂。     

基于固定式低压开关柜GGD3的改进制作GGD(改)

GGD(改)具有分断能力高(≥65kA),动热稳定性好,操作安全可靠,运行直观明了,经济实用,故障监控、接地保护等与老型GGD3相比都大为提高。我公司属于粘胶短纤生产企业,对周围环境影响很大,尤其对于PC室、     

纺丝电锭在工程全系统中节能效果的综合考量与评估

研究和实践表明,机电产品的节能技术改造,其最终效果应放在与之相关的大系统中综合考量和评估。本文以粘胶长丝生产企业十分重要和数量众多的纺丝电锭为例,分析和总结了历史上多次重大的技改因目的、途径和方法上的偏失而导致实际效果与目标值大相径庭的原因,为今后的系统节能课题研究提供了思考路径与参考资料。     

彩电场偏转线圈断路的修复方法

一台福日牌HFC—450G型彩电出现水平一条亮线的故障。查场输出部分的厚膜电路HM6232的①脚电压为60V(正常值是75V),且电流很小。拆下该厚膜集成块检查无损坏元件,续查其外围电路也无元件损坏,进而查出场偏转线圈已断路。该偏转线圈型号为BJ6B。因场偏转线圈难以配到,试将偏转线圈拆下维修。首先焊下场偏转线圈的三个接线端,细细察看场偏转线圈是由上下二块喇叭状磁体拼合而成,中间接口由二片弹性钢带扣央紧,并用胶粘牢。接下来用小型一字型螺丝刀撬开弹性钢夹,小心括云磁体与塑壳连接处的粘胶,用螺丝刀轻轻的撬松两块磁体,小心地取出,取出后发现上下两磁体上的线圈在喇叭口粘胶的地方     

活性炭纤维毡直接用作超级电容器电极

研究了商品粘胶基活性炭纤维毡直接用作超级电容器的电极,在6 mol/L KOH电解液中的电化学电容性能.活性炭纤维毡的BET比表面积为2 066 m2/g,含氮量为1.48%.高比表面积产生的双电层电容和表面氮原子准电容的作用,使活性炭纤维毡在电流为50 mA/g时的比电容达到194 F/g.由于纤维开放的孔结构和毡电...     

Effect of Cationic Modification on the Color Absorption Properties of Viscose Fibers

Abstract

The aim of this work is to determine the dyeing process of the cationic modified viscose fiber. The results indicated that cationic modified viscose fiber greatly improved the dyeing ability and dyeing rate. Sodium chloride and urea have little effect on the dyeing process. The degree of fiber dyeing gradually increased with the dyeing time increasing. The dyeing temperature and fixing time has little effect on the cationic modified viscose fiber. It was also found that the morphology of the viscose fiber had no obvious change after cation modification. The dyeing process had no influence on the mechanical property.     

Preparation and Characterization of Flame-Retardant Viscose Fiber Treated with TAECTP

In this paper, hexachlorocyclotriphosphazene (HCCTP) was used as a raw material to synthesize triaminoethyloxy cyclotriphosphazene (TAECTP). After-finishing method was applied to the preparation of flame-retardant viscose fibers. LOI results showed that TAECTP was intrinsically flame retardant. After burning, inflated carbonized coat was found on the fiber surface. Thermogravimetric analysis (TG) indicated that primary decomposition temperature of the fiber moved up about 30°C, as compared with untreated viscose fiber. Loss on mechanical properties of fibers was insignificant. The introduction of TAECTP was compatible and the flame retardancy of viscose fiber was greatly improved with limited negative impact.     

The preparation and performance of okra protein viscose fiber

Abstract

The protein viscose fibers have a great application in the textiles. It is promising to develop the new-type and functional protein viscose fiber. The aim of this work was to prepare the protein viscose fibers which has the available performance in textile. The okra powder was emulsified and dispersed by surfactant. The spinning dope of viscose was blended with okra emulsion and cell wall protein gel solution. The okra protein viscose fiber was obtained by wet spinning. The morphological structure, main physical properties and wearing performance of the fibers were tested and analyzed. The surface of okra protein viscose fiber was smooth and uniform. The protein content of the fiber was stable, and the amount of protein loss was small. The strength of the fiber was unchanged compared with the ordinary viscose fiber and the friction coefficient of the fiber was small and it had soft hand feel. The fiber had high moisture regain and excellent moisture permeability and air permeability. The okra protein viscose fiber had a certain anti-inflammatory effect and good skin-friendly properties, which is of great significance for the future development of green health care fabrics.     

钾离子对紧凑型荧光灯光电参数的影响研究

在无机粘结剂水涂粉工艺中，采用化学处理方法改变纳米胶中钾离子的含量，分别将其应用在涂粉工艺中，制作出2U-9灯管，并分别测定其管压、光通量、光衰、显色指数等参数。指出钾离子0.01％的浓度变化，都会对荧光灯的光电参数产生相当大的影响。     

Preparation and characterization of collagencoclotriphosphazene and its action in flame-retardant viscose fiber

Abstract

In order to develop a flame retardant using the phosphazene derivative of a natural polymer, hexachlorocyclotriphosphazene and collagen were used as the raw materials to synthesize collagencoclotriphosphazene. The Fourier transform infrared results indicate that flame retardant collagencoclotriphosphazene(CGCP) was successfully synthesized. Thermal properties of CGCP were evaluated using thermogravimetry. The thermal analysis shows that the introduction of phosphazene into collagen lowered the primary decomposition temperature, increased the decomposition rate, and caused less weight loss. The viscose fibers blended by CGCP were prepared by the wet spinning method, and the properties of the fiber were investigated. Limiting oxygen index of the flame-retardant fiber containing 12% CGCP was 28.3%, which increased greatly comparing to the fiber sample without CGCP and just decreased slightly to 27.6% after 30 washing cycles. The thermal analysis shows that the introduction of CGCP increased the decomposition rate of viscose fiber at a lower temperature, and caused less weight loss. After burning, the scanning electron microscopy image showed an inflated carbonized coat on the fiber surface. The effect of CGCP on the mechanical properties of the fibers was insignificant. CGCP was compatible with cellulose, and the flame retardancy of the viscose fiber was significantly improved. Due to the introduction of CGCP, moisture regain of the fiber is a little higher than that of viscose fiber.     

MH/Ni电池集流体用中空镍纤维毡

以粘胶、涤纶混纺的无纺布为基体,用化学镀镍进行导电化处理和电沉积,制备了MH/Ni电池集流体用三维结构镍纤维毡.用SEM、EDS和XRD对样品的形貌、元素和物相进行分析.镍纤维呈中空结构,管壁光滑,壁厚约为2 μm,柔韧性较好,元素组成为99.44%的Ni和少量P、C,面密度为492.86 g/m2,孔隙率约为93%.     

Self-Heating Composite Fabric and Its Application in Sports Injury Protection of Athletes

Abstract

This work is mainly focused on developing a self-heating composite fabric using the PVF and PPP. Prepare a new functional composite self-heating fabric through core spun method based on the synergy of hygroscopic heating principle and the characteristics of piezoelectricity of tourmaline. PVF with good hygroscopicity and PPP with piezoelectric effect were blended to produce fabrics with continuous heating function. Spandex fiber filament was set as a core to introduce elasticity, and the PVF and PPP were set as a sheath. In order to test the heating insulation properties of the fabric better, an athlete volunteer to be test foe the self-heating properties of fabrics during exercise. The heart rate was used to characterize the athlete’s exercise intensity. The fever effect was not particularly obvious when the exercise intensity was low because the human body sweats less, but with the increase of exercise intensity, the heating effect increases obviously. And when the exercise intensity continues to increase, the body releases a lot of heat, which made the heat released by the fabric becomes less obvious. Therefore, the functional composite self-heating fabric is promising materials in sports injury protection of athletes applications.     

三菱350 MW机组滑参数停机分析

滑参数停机能快速降低缸温,有利于尽快对汽轮机本体进行检修.阐述了三河发电有限责任公司在停机过程中,汽轮机与锅炉紧密配合,将汽轮机胀差和高、中压缸温差等参数控制在合理范围内的整个过程.分析了机组滑停过程中的不足和问题,针对滑参数停机过程需要注意的问题提出了合理化建议.     

水轮发电机的低励和失磁及其保护措施

本文根据水轮发电机的特点,重点分析其低励、失磁的物理过程及其引起的不良后果。     

一种实用的时间参数测量电路

文中对两种时间参数和数字化测量进行了探讨，并详细分析了核心电路的工作过程。