织机共轭凸轮的结构参数研究(二)

本文分别讨论了推、回程压力角相等和不等时的凸轮轴位置的计算方法.     

提字带织物组织CAD应用软件的研制

本文简要介绍了提字带织物组织设计的CAD软件,包括软件的组成、功能及使用特点等.本应用软件在IBM PC及其兼容系列微机上运行,硬件环境要求低,上机操作简单,本软件经织带厂使用证明,具有较强的实用价值.     

高速织机四杆打纬机构的优化平衡

本文探讨一种高速织机四连杆打纬机构的平衡分析和计算机辅助设计方法。无梭织机高速运转时的打纬过程引起机架的振荡和经纱张力的波动。本方法提出通过各杆件质量和几何位置的分布设计达到振荡力、振荡力矩、轴承力和输入力矩的平衡来探索在设计过程中的连杆的最优动态响应。优化过程涉及选择设计参数、制定优化准则、运动学平衡和减少振荡力和振荡力矩。通过对实例动态特性能得到明显改善的优化结果,说明了打纬机构的动态设计是无梭织机筘运动设计的一个极重要部分。     

Research on Eliminating Set-marks by Image Processing

IntroductionSet-marks , which mean pickspacingis wider or narrowerthan the normal value, are severe fabric defects . Theydecrease fabric quality and cause an i mportant loss of moneyfor weaving mills .Loom manufactures andscientists have beensearching for various methods to eli minate set-marks .Cause of Set-MarksA pri mary cause of set-marks is the deviation ofcloth-fell caused by creep and stress relaxations of warpyarns and fabrics[4]. Because warp yarns and fabric areunder tension during…     

An Analysis of the Orthogonal Crank-rocking Lever Spatial Mechanism for the Weft Insertion in Rapier Looms

On the basis of the analysis of typical orthogonal crank-rocking lever spatial mechanism for the weft insertion in rapier looms, the rules of the outputting lever motion and the mechanism pressure-angle variety are studied when the maximum swing angle of rocking lever and the length of outputting lever have different values, and the optimum parameters suitable for motion transmission can be chosen. At the same time some existing shortpoints of the mechanism are also pointed out.     

双喷平绒织机气路改造实践

分析了普通喷气织机的气路系统.通过在该气路系统上加设辅助气包、加接快接插头等增引气路分支;通过三通阀和电磁阀对各气路分支的气流进行整合和通断控制使其适应双层织造的需要.应用虚拟仪器编程对有关数据进行测试分析后可知,该新气路完全适合双层织造的需要.     

基于CFD技术的喷气织机主喷嘴内部流场的分析

通过对喷气织机主喷嘴现状的分析提出了应用CFD的思路.应用NUMECA软件进行主喷嘴内部流场数值模拟,揭示了导纱管内不同截面上气流速度的分布,并对主喷嘴内部气流的轴向动压和马赫数分布进行了分析.结果表明,利用数值模拟研究主喷嘴流场特性方便、快捷,且精度也较高.     

CONJUGATE CAM WITH FIVE-BAR LINKAGE MECHANISM FOR RAPIER DRIVE OF FLEXIBLE RAPIER LOOMS

A new type of rapier drive for flexible rapier loom through conjugate cams with five-bar linkage mechanism is raised and analyzed. Two designs suitable for the conversion of 1515-190.5 shuttle looms are given as examples. This mechanism can be applied to traditional shuttle looms as well as to new flexible rapier loom design.     

剑杆织机的纬纱交接条件

本文指出在使用双剑杆进行织造的剑杆织机上,如果剑杆的交接冲程设计不当,会出现三类不正常的交接失误现象,即:纬纱松圈,交接不到和交接不稳。在对两剑运动理论分析的基础上,指出名义交接冲程与实际交接冲程的区别,分析了两剑进足的时间差△α对纬纱实际交接冲程的影响,得出了保证纬纱不松圈的交接条件,以及名义交接冲程与△α之间关系的公式。进一步又得出了最大实际交接冲程 L(α)_(max)与 d 和△α的关系式,并指出当 d=2L(α)_(max)时,两剑的总动程最小。本文还推导了纬纱交接时两剑的相对速度 v 与 L(α)_(max)的关系公式,并讨论了如何选择交接点位置的问题。     

RECONSTRUCTION OF AXLE-TREADLE LOOM IN HAN DYNASTY

The axle-treadle mechanism of Han loom consists of a set of components, including two pedals controlling one shaft via a central axle. Based on the new archaeological finds, especially the pottery loom model, the collection of Krishna Riboud, and the historical document, a kind of axle treadle loom with oblique warp frame was reconstructed by author. It might be applied in the central China at that time, especially in Shandong and Jiangsu areas, and it was not later than the Warring State period for the oblique axle treadle loom to come into being and reach a peak in the Han Dynasty. After that time, it was used with the vertical frame but lost the importance gradually.