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 crankrocking 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.

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.

MODIFIED MOTION PATTERN OF LOOM RAPIER

A modified trapezoid acceleration pattern with a constant speed part is introduced for loomrapier motion driven by cam.The pattern can meet the time requirement of rapier on entering andleaving the shed,and can satisfy the condition when the period duration of inserting is not equal tothat of withdrawing.Meanwhile,the pattern can also reduce the maximum acceleration of rapierand make the derivatives of rapier acceleration change continuously without any abruptness ofjerks.

KINETO-ELASTODYNAMICS OF A FLEXIBLE RAPIER LOOM

For a complicated high speed reciprocating machine to meet the requirements of precise motion of its mechanisms, a study of its kineto-elastodynamies is necessary. Here is an example to find out the cause of the misengagement of flexible rapiers, by means of kineto-elastodynamic analysis, so as to meet the requirements of flexible rapier loom′s design, with beat-up and weft insertion mechanisms operating at high speed.

A STUDY ON THE DYNAMIC RESPONSE OF CAM BEAT-UP MOTIONS FOR RAPIER LOOMS

Based on the requirements of the two-phase rapier loom’s beat-up system characteristics, the dynamic responses of its beat-up system to three different types of cam input motion are studied in this paper. Also, their corresponding analytical comparisons are made. At the end of the paper, the authors put forward a proposal of new type cam beat-up motion for future practice.

GTM-AS型剑杆织机传剑机构分析

GTM-AS型剑杆织机是比利时PICANOL公司生产的一种高档剑杆织机,对其传剑机构工作过程作了简单介绍,在此基础上运用运动学原理系统分析了其主要组成结构如空间万向联轴节、曲柄摇杆机构及放大机构的工作原理,从而得出传剑机构的运动规律,由此表明空间万向联轴节的合理使用对改善传剑运动规律及方便工艺调节起到关键作用。

从ITMA ASIA+CITME 2022看织造机械的技术进步

总结2022中国国际纺织机械展览会暨ITMA亚洲展览会上织造机械及织造准备的最新技术进展。织造机械的结构与性能不断优化,发展更加贴近市场需求。国产剑杆、喷气、喷水织机的制造水平发展迅速,提高了国产设备的核心竞争力。随着人工智能的爆发式增长,织造机械的数字化转型步伐加快,先进的信息技术和自动化工具的运用使织造机械呈现出个性化、智能化、绿色化发展新趋势。认为:近几年织造机械在高速化、自动化、绿色化方面进步显著。

间隔织物双剑杆织机平行打纬机构箱体的振动分析

针对双剑杆织机共轭凸轮与四连杆组合的平行打纬机构箱体随着织机转速的提高产生强烈振动,影响打纬精度和可靠性的问题,采用理论分析与虚拟仿真结合的方法对打纬机构及箱体进行动应力和振动特性研究。建立了平行打纬机构的动态静力分析方程,运用ADAMS软件对机构进行多体动力学仿真,求解箱体所受的支反力;构建箱体—弹簧阻尼—柔性基础的系统模型,分析箱体在竖直方向的受迫振动,并在仿真过程中探索减小箱体振动的方法。研究结果表明:摆臂轴孔处箱体所受支反力峰值最大,打纬推程阶段箱体的受力最为集中;当凸轮轴转速为260 r/min时齿轮啮合频率与箱体一阶固有频率相等,会产生共振,应避免使用这一转速工作;箱体在竖直方向上产生周期性振动,增加螺栓个数和附加动力减震器有助于改善箱体的振动特性,振幅分别减少38%和23%。

双层引纬机构振动系统建模研究

为解决双层剑杆织机质量的双层引纬机构振动问题,建立双层引纬机构的剑轮-剑杆-气垫导轨冲击振动刚柔耦合动力学模型,进行剑杆的瞬态振动特性仿真分析,设计振动测试实验平台对仿真模型参数进行修正,为后续双层剑杆织机设计和改进提供了精准的仿真模型。

泡泡牛仔布的开发实践

文章阐述了泡泡牛仔布的组织规格设计及生产过程。采用双轴织机织造,通过特殊的上机工艺控制两个织轴的上机张力,调节泡比大小,使织物泡形饱满清晰、立体感强。经后整理工艺,成布的一等品率达99%。

适用多类型纬纱引纬的剑杆织机用剑头设计方案

为满足剑杆织机用剑头对多类型纱线的适应性和夹持稳定性,介绍剑杆织机用剑头的现状和GS900型剑杆织机技术亮点;在GS900型剑杆织机常规剑头的基础上,根据涤纶长丝、扁平纱、圈圈纱3种纱线特点,对夹纱器表面粗糙度、接纬剑头引纬结构、夹纱器夹持力等进行优化,设计制作出适用多类型纬纱引纬的剑杆织机用剑头。指出:该剑头能更好地提高适应性和稳定性,减少织机停台更换、调试剑头的次数和周期,减轻劳动强度,显著提升了剑杆织机的生产效率和产品质量。

一种无假边系统的毛精纺剑杆织机的研发与应用

近年来,随着现代科技的不断发展,机械设备也在不断更新换代,技术含量越来越高。做好对这些先进设备的消化吸收,挖掘设备潜能,并在此基础上进行完善和改进,是纺织设备工作者孜孜不倦的追求。基于此,文章讨论了一种无假边系统的毛精纺剑杆织机的研发及应用,包括假边的产生、假边的回用、修边系统的研制目的以及传统假边处理系统、剑杆织机新型假边处理系统的研发及其应用、研发效果和效益等。经研究可知,去掉左侧假边纱机构和两侧假边纱机构是新型剑杆织机的主要研发内容,目的是在实际应用中达到良好的无假边纺织效果。

剑杆织机试织芳纶接结双层织物的生产实践

采用GA731型剑杆织机试织芳纶接结双层织物,通过优化调整、确定合理的上机工艺参数,有效解决了纬缩、星跳、跳纱疵点等问题,生产高质量的个体安全防护装备用织物,并有效提高织机生产效率,获得良好的经济效益.

Review and Prospect of the Shuttleless Loom Development

In this paper, a review of the shuttleless looms’ development shows that three types of shuttleless looms: rapier, Jet and gripper projectile, are now equally matchable with each other. A prospect of the shuttleless loom’s development is also dealt with. It can be predicted that both rapier and Jet looms will be developed further and the future development of a new type of modern weaving looms will be prosperous in the coming 21st century.

Design of Electronic Weft-Insertion System for Three-Dimensional Loom

The motion laws for rapier weft insertion mechanism are analyzed. According to the special requirements on rapier loom's weft-insertion system for weaving three-dimensional( 3-D) fabric,a new rapier electronic weft-insertion system is presented. The design principle for 3-D loom's weft insertion system is introduced,including the design of the motion law of electronic weft-insertion system,the driving system's hardware configure,and its software's controlling principle. The weft insertion system is computer-controlled and servocylinder driven so as to control the rapier's movement to insert the weft into the multi-shed while 3-D weaving. This method greatly simplifies the weft-insertion system,achieves weft-insertion with variable travel,and improves the flexibility and reliability. The weft insertion system has been applied in a 3-D loom successfully.

挠性剑杆织机变导程螺杆设计

针对挠性剑杆织机变导程螺杆设计问题,以曲柄转角作为唯一变量,提出变导程螺杆传剑机构建模方法及初始导程边界控制条件与调节方法,给出变导程螺旋线的设计方程;以椭圆比函数作为剑杆运动规律,仿真分析不同椭圆比系数对剑杆初始加速度及变导程螺杆导程曲线的影响。结果表明:剑杆初始加速度不能为0 m/s 2;随着椭圆比系数增加,导程函数初始值增加,但升程阶段导程函数呈现非单调性变化,对应椭圆比系数范围为0.15~0.30;当椭圆比系数为0.2时,2种不同幅宽所对应螺杆导程变化率均约为27%,可为实现不同幅宽织机螺杆系列化设计提供理论参考。

OPTIMAX型剑杆织机无导剑钩改造的实践

为了解决因剑头振幅较大,存在摩擦经纱及剑头运行稳定性差的缺陷,导致竹涤、细号尼龙等特殊纤维品种织造效率低、疵布率高的问题,介绍剑杆织机引纬系统的组成,分析剑轮、引纬剑带、剑带导轨、导剑轨固定块、剑头等存在的问题,并提出改造措施;通过对比无导剑钩织机与正常导剑钩织机织造状态,说明无导剑钩织机织造平均效率约为96%,10万纬经停和纬停显著减少,疵布率降低约19%。指出:经过改进,剑杆织机平均织造效率提升约2.58%,导剑钩的日常维护费用减少。

剑杆织机柔性从动件共轭凸轮打纬机构动力学分析

针对剑杆织机共轭凸轮打纬机构因自身振动造成筘座角加速度偏差大,降低织造的质量,缩短共轭凸轮寿命的问题,对共轭凸轮打纬机构进行合理化简化后,采用Rayleigh-Ritz法对柔性从动件进行离散化处理,基于Lagrange方程建立了剑杆织机柔性从动件共轭凸轮打纬机构的动力学方程。运用Mat Lab软件对柔性从动件共轭凸轮打纬机构进行了动力学仿真分析,在仿真过程中通过改变打纬机构的结构参数探索减小打纬机构振动的方法。仿真结果表明,打纬机构在高速运动过程中柔性从动件产生的横向振动会导致筘座角加速度波动明显,提出了通过减小筘座脚质量来减小筘座角加速度偏差和机构振动的方法。

剑杆织机纬向停台原因分析及相应技术措施

针对剑杆织机纬向停台的原因,分别从纬纱张力的控制、储纬器的调节、选纱针的穿纱顺序、剪切部分的调节、剑头及纬纱交接状态的调节、断纬基本参数的设定等方面,介绍了具体措施,从而达到降低纬向断头的目的。

基于伺服电动缸的立体织机引纬系统的设计

为实现立体织物中多层经纱形成的多个梭口引纬,分析了剑杆引纬的运动规律以及剑杆织机引纬机构的特点。根据织造三维机织物对立体织机引纬机构的特殊要求,设计了一种新型的剑杆引纬系统。介绍了立体织机引纬系统的总体设计,驱动系统的硬件配置以及控制软件的基本原理。该引纬系统采用计算机控制、伺服电动缸驱动的方法来控制立体织机的剑杆运动,不但简化了引纬机构,还可实现变动程引纬,提高了立体织机引纬的灵活性和可靠性。所设计的引纬系统已应用于立体织机的样机开发。