台车弯纱轮啮合分析与工艺计算

本文采用图解法研究台车弯纱轮与织针的啮合,从而得出弯纱轮啮合深度的简便计算公式和带纱轨迹的近似作图方法,为实际生产中的钢片形状设计、弯纱轮结构分析和产品系列化提供了一种简便的研究方法。     

台车提花机件的改进

台车生产提花针织物的主要机件之一是提花轮(圆型花压板)。在生产过程中,由于提花轮与弯纱轮之间有十枚以上的针没有压针机件控制,致使弯纱轮垫在针钩里的线圈失控,线圈易变形或下落,造成小漏针残     

台车上真丝织物的强制成圈织造

本文提出了利用成圈轮进行纱线强制成圈的织造方法,来解决不能依靠弯纱轮精确弯纱的纤维在台车上的织造问题,并分析了台车生产中沉降片在挺升新线圈过程中挺升阻力的自调节作用。随后提出了在台车上利用现有装备进行强制成圈织造的技改方法。     

RX—PL2型提花毛圈机沉降片和织针运动曲线分析

本文以RX—PL2型提花毛圈机为例,针对提花毛圈大圆机沉降片运动曲线的特性,分析了水平提花轮与沉降片的啮合关系,探讨了提花轮齿及其钢米控制沉降片的运动状态,研究了由沉降片三角和由提花轮控制沉降片的运动曲线与织针运动曲线的对位关系,并分析了毛圈纱垫纱位置与弯纱成圈的各种状态间的关系.     

圆袜机垫纱位置参数解析计算及其应用

一、序言在单面舌针圆纬机(包括单针筒袜机)的新机设计与老机改造中都将碰到弯纱三角的形状和位置、针的几何尺寸和喂纱区(点)之间的关系问题。亦即弯纱角γ、针的各部分几何尺寸、喂纱区宽度 B、对应于最佳喂纱点与压针点的针筒转角φ、喂纱点高度 h     

磁悬浮式驱动织针弯纱张力的动态分析及研究

由于弯纱张力对织针的受力及运动稳定性影响较大,基于磁悬浮式驱动织针的原理及结构,结合弯纱中针钩内点与纱线接触的运动轨迹,建立磁悬浮织针弯纱编织时的力学模型。该模型针对纱线特性、弯纱接触包角及接触摩擦系数对弯纱张力的影响,提出分析弯纱张力的数学表达式,并对该模型进行Matlab数值分析与计算,以及Ansys非线性仿真分析。结果表明,在弯纱过程中,纱线张力随弯纱深度的增加而显著增大,对磁悬浮式驱动织针弯纱编织的动态稳定性产生一定的影响。     

用气流纺棉纱编织的平针织物的几何结构和尺寸性能 第五部分 线圈长度

除线圈形态影响针织物几何特性以外,线圈长度是一个十分重要的参数。棉纱的线圈长度在其编织过程中就已完全确定,因为随后的松弛过程只引起1～3％的收缩率(见第三部分表1)。可是,在编织过程中,其织物内形成一个线圈的纱线实际长度与由根据弯纱深度和沉降片间距得出的理论计算值不等,这种差异可用弯纱时纱线的回退来说明。虽然线圈长度可通过控制给纱速率来预先确定,但大多数针织物的编织仅控制纱线的输入张力。在以前的研究中,我们阐述了在尽可能最小的弯纱深度下形成的线圈的结构与其它弯纱深度条件下形成的是不同的。而且,我     

圆纬机编织机构的改进

分析圆纬机的现有结构表明,编织系统的缺点之一是机械弯纱角和工艺弯纱角不适应。一般多系统单面圆纬机的机械弯纱角不超过60°,而工艺弯纱角可达70.5°或更大。由论文[2]可知,增加工艺弯纱角有助     

无缝针织圆机弯纱深度与织物尺寸的关系

以锦包氨和涤纶纱线为原料,在单面无缝内衣针织圆机上于10种弯纱深度条件下,织造了平针添纱、1+1假罗纹等六种组织的试样;测试了试样织物经全松驰处理后的尺寸,并用回归分析和曲线拟合方法分析了弯纱深度与织物尺寸的关系。结果显示,六种试样的长度与弯纱深度呈不同的线性关系,宽度与弯纱深度呈不同的六阶多项式函数关系。     

弯纱深度对羊毛衫透气性的影响

通过调节横机弯纱三角的高低位置来调节其弯纱深度,在不同弯纱深度条件下分别编织了纬平针、满针罗纹、2+2罗纹、罗纹空气层、畦编、半畦编等在羊毛衫中常用的几种组织;并通过测试,对织物的未充满系数、面密度、透气性等各项性能与弯纱深度之间的关系进行了分析并得出了回归方程式。结果表明:横机弯纱深度对织物的未充满系数、面密度以及透气性影响明显,弯纱深度越大则织物线圈增长,造成织物疏松,面密度下降,透气性增强。     

一款硬质造型滤嘴卷烟接装质量的改进

  目的  解决硬质造型滤嘴接装时出现的滤嘴端面染色、接装纸毛刺、接装纸横纹等质量缺陷。  方法  优化滤棒硬度、成形纸定量、接装纸油墨耐温性和附着牢度,降低切割鼓轮容刀槽宽度、增加负压吸风孔数、加装滤嘴切刀清洁装置。  结果  ① 滤嘴端面由改进前的卷接5 min后出现染色到彻底不再染色;②接装纸毛刺烟支比例由10.8%降低至0.01‰;③接装纸横纹烟支比例由1.5%降低至0.03‰。  结论  该方法可为行业硬质造型滤棒在生产中的工艺优化提供参考。      

转杯纺纱杯支撑装置的改进

目前使用的支撑轮式转杯纺纱机的纺杯杆支撑装置的径向定位方法是用2对能自由转动的支撑轮沿轴线形成的契形夹缝来支承纺杯杆。此技术的优点是用低轴承转速实现高纺杯转速,降低了对轴承的要求并延长了轴承寿命。但在实际应用中,因为纺杯杆给支撑轮的压力太大,使得支撑轮的表面易磨损,因而介绍了一种纺杯支撑装置的改进方法,改进装置不仅能减小纺杯杆对支撑轮表面的压力,延长支撑轮寿命,同时也减小了纺杯杆的弯曲变形,提高纺纱系统的动态稳定性。     

10—THE VALIDITY OF PRESSURE-CORING FOR ESTIMATION OF THE CONTENT OF NOOGOORA BURR IN WOOL BALES

Experiments are described to establish the validity of samples, for Noogoora-burr determination, taken from wool bales with pressure-coring tools. Coring tools of ¾-in. and larger diameters give unbiassed samples for the determination of both Noogoora burr and burr medic. The ½-in.-diameter tool, although previously shown to give unbiassed samples for the determination of burr medic, is subject to some bias in the sampling of bales containing Noogoora burr.     

Burr Beater Design and Operation Part I: Investigations Using a Mechanical Model

The effect of burr beater design on the efficiency of vegetable matter removal was investigated using a mechanical mode). A model was used because of the difficulties of studying the effect of parameters such as the number and shape of the blades of full-sized burr beaters. The investigation also included a number of operational parameters such as fibre loading on the morel, burr beater/morel clearance, burr beater speed, and morel speed. The results confirmed the importance of using high burr beater speeds, close settings, low fibre loadings, and large numbers of blades. In general, blade shape was not critical for VM removal, although the use of sharp blades did lead to an increase in vegetable matter removal.     

9—THE VALIDITY OF PRESSURE-CORING FOR ESTIMATION OF THE CONTENT OF BURR MEDIC IN WOOL BALES

Miniature wool bales of about normal packing density (approximately 16 lb/ft³ on a greasy-wool basis) were constructed from burr-free greasy wool with burr added in such a way that the true over-all burr content was known. These were sampled with a range of pressure-coring tools differing in size. Except when small coring tools were used in bales of high burr content, there was no significant difference between the mean burr content of several core samples from a miniature bale and the true over-all value for that bale. It is concluded that the act of pressure-coring does not distort the burr content of a sample and that the sample is therefore suitable for determination of clean-wool content. The between-core variance of burr content decreases as the size of coring tool increases.     

Burr Beater Design and Operation. Part II: Carding Trials

Burr beaters are the principal means by which vegetable matter is removed from wool during carding. A previous study using a miniature card identified that burr-beater speed, setting, blade shape, card speed, and production rate were likely to have significant effects on operational efficiencies. The extension of this study to full-sized cards is reported here using wools contaminated predominantly with either burr or seed/shive. The results obtained confirm that burr beaters should be operated at high speed, with close settings, and that sharp blades offered some increase in efficiency. Increasing both the production rate and the speed of the card decreased the removal of seed/shive but had no effect on the removal of burr, whereas decreasing the forepart-worker settings decreased the removal of burr but had no effect on seed/shive.     

27—A STUDY OF THE REMOVAL OF VEGETABLE MATTER BY BURR BEATERS ON MODERN WORSTED CARDS

An investigation is reported in which the efficiency of burr beaters on a modern worsted card was measured over a range of vegetable-matter (VM) types and contamination levels. The results indicate the prime importance of the morels for removing VM from wool. Over-all, the burr beaters removed some 90% of the VM originally present, thicker particles being removed more efficiently than thinner ones. In an extension of the investigation, the efficiency of the comb was measured and found to be high and independent of particle size. This suggests that an increase in the working efficiency of the burr beaters during carding can lead to a reduction in the VM-contamination level of the final top.     

Comparison of Methods of Test-specimen Preparation for Wool-colour Measurement

Comparisons are reported of colour-test results made on greasy wool after cleaning by using the two methods of test-specimen preparation in the IWTO colour-test method. It is shown that the burr content of the greasy wool was the main factor affecting the difference between methods. The results support the inclusion of the two methods of test-specimen preparation in the IWTO TME for yellowness measurement. They also support the exclusion of lightness measurements for all but blender-method results on high-yielding wools with no medicago burr.     

并条机牵伸罗拉斜齿顶面CBN砂轮磨削加工

在分析罗拉斜齿顶面棕刚玉砂轮磨削缺陷的基础上,提出用立方氮化硼(CBN)砂轮代替传统的棕刚玉砂轮进行磨削加工;确定CBN砂轮的构造特性和结构尺寸;设计CBN砂轮金刚滚轮修整装置;并对CBN砂轮修整参数进行深入分析研究。使用情况表明:采用CBN砂轮对罗拉斜齿顶面进行磨削加工,其精度和表面质量均有很大的提高,磨削表面无烧伤现象;砂轮的耐用度大大提高,其使用寿命是棕刚玉砂轮的50倍以上。     

化学渗浸砂轮磨削性能的实验研究

砂轮作为主要的磨削工具,在磨削过程中会产生大量的热,容易造成工件的表面烧伤和微裂纹.为了解决这个问题,研究出了一种化学渗浸砂轮.该砂轮利用砂轮中的气孔,将冷却剂、润滑剂、抗粘附添加剂、固化剂等物质渗入到砂轮中,固化后在砂轮孔隙中形成一层固化膜,在磨削过程中,起到有效的冷却和润滑作用.实验结果表明,采用这种砂轮可以有效降...