共查询到18条相似文献,搜索用时 140 毫秒
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络筒机卷绕工艺的设计要点 总被引:1,自引:1,他引:1
探讨影响络筒工序筒子卷绕质量的关键因素.通过对卷绕运动、卷绕重叠、卷绕稳定性、卷绕凸边、卷绕的起皱和胀边多方面的分析,提出了设计络筒机时应重点设计好卷绕角、导纱动程、卷绕张力、接触压力、卷绕比等关键因素.指出:卷绕角不能太大,以保证卷装的稳定性;保持导纱动程微量变化,以防卷装凸边;控制卷绕张力和接触压力,减少起皱和胀边;合理选择卷绕比,防止重叠. 相似文献
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为了完成全程卷绕,捻线机每卷绕一层都有一个很小的级升m.为使纱线层次分清,不相互重叠纠缠,防止退绕时脱圈,一般向下卷绕得密些,称为绕纱层,向上卷绕得稀些,称为束纱层.这样两层密绕的纱层之间被一层稀绕的纱层隔开.卷绕绕纱层时,钢领板速度慢,卷绕束纱层时,钢领板速度快.当束纱层自下而上退绕时,往往会将相邻的绕纱层一起拉出,形成脱圈,这是因为绕纱层在管纱表面所处的状态不及束纱层稳定的缘故.此时钢领板上升慢,下降快. 相似文献
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针对纱线在卷绕成型过程中不当的卷绕参数导致纱线出现的叠纱现象,笔者提出一种周期动态改变卷绕比的防叠算法.通过建立纱线卷绕过程中的数学模型,模拟纱线卷绕成型的过程,采用MATLAB仿真的方式重现了叠纱现象;在对叠纱过程进行理论分析基础上,采用周期动态改变导纱头速度的方式实现该算法.经过仿真实验与实机测试表明:该算法能有效... 相似文献
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为有效保持纱线卷绕系统中张力稳定,针对系统中存在的非线性和时变性参数,提出了一种基于张力观测器和参数自适应的无传感张力控制方法.首先,基于力矩平衡原理建立纱线卷绕系统数学模型,并设计了降阶张力观测器,将观测值作为系统输入前置反馈补偿值,避免了使用张力传感器带来的测量延迟;然后,采用Landau离散时间递推算法辨识卷绕系... 相似文献
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印度Lohia Starlinger公司新开发的lofil HT技术,使公司内部制作高韧性定制缝纫纱线成为可能,填补了供应链管理的空缺,其lofil 40/4 HT复丝纺丝-拉伸-卷绕生产线产能现已扩大。该新型生产线有4个纺纱位和4个卷绕头,可提供粗达533.3tex的长丝,或 相似文献
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Spiral yarn composed with an elastomeric filament DOW XLA, from Dow Chemical, and wool fibres outwardly wound around the elastic core presents a complex behaviour when wound on bobbins to be dyed. This article presents a basic mathematical model with the aim of evaluating radial pressure and transversal stress on bobbins at different angles of winding, different yarn tensions and yarn cross-section areas. Considering the additional complexities of the real problem, an experimental comparison of bobbin alterations under different conditions was carried out with the realisation of two experimental sets. The first experimental test bench allows the variation of winding tension, angle of winding and stroke, then experimental tests were carried out on a winding machine SAVIO varying the yarn tension value and adding a mechanical constrain to the device with the aim of reducing yarn-sliding phenomena, in particular during the thermal cycle. The fundamental parameters have been determined as the angle of wind and the yarn tension during the winding operation. Higher values of wind angle help keeping the bobbin shape. Higher values of yarn tension during winding operation allow the preservation of bobbin shape after the dyeing cycle. On the other hand, the upper limit is represented by yarn tensile strength. Moreover, it is not useful to apply a varying wind tension during the winding process. 相似文献
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介绍了纱线毛羽的状态和危害,讨论了络筒工序对纱线毛羽的影响因素,指出络筒速度、摩擦纱段、清纱板隔距、槽筒材料及形状、气圈破裂器、导纱距离大小、筒子卷绕直径大小等因素对纱线毛羽的影响,并提出了相应的措施。 相似文献
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In the present work, the initiative is being taken to study the spun yarn failure behaviour under real dynamic conditions i.e. winding. An attempt is made to study the dynamic failure behaviour of blended ring yarn in relation to yarn structure. Multi-coloured tracer fibre technique is employed to study the broken ends of yarn during the winding process in terms of proportion of fibre break/slip, configuration of yarn broken end and yarn failure length. The ring spun yarn failure during winding is basically dominated by fibre breakage. The length of broken and slipped fibres is found to be different in trailing and leading portion of the broken ends and also depends on viscose content in the blends. The failure zone length and sum of percentage of tapered and slipped broken ends are found to follow the exactly similar trend with fibre failure coefficient with the change in blend ratio. The mathematical model established to explain the spun yarn failure during winding process displays lower error%. 相似文献
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针对纱线经过络筒机后毛羽数量不但不减少反而会增加这一现象,分析了络筒工序纱线毛羽产生的各种因素。说明络纱毛羽与络筒机型、机械状态、工艺参数和操作水平有一定的关系;1332M型、GA013型等络筒机络纱毛羽比自动络筒机的少。要减少络纱毛羽,首先要采取措施减少管纱毛羽,其次应合理选择张力圈重量、清纱板隔距、导纱距离、破裂环高度、气圈控制器和气圈破裂器等工艺参数;同时,还要选择新型涡流喷嘴、新型气圈破裂环和导纱轮等装置。 相似文献
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为提高材料强度的利用效率,实现纤维缠绕管强度比沿壁厚的均匀分布,在内压和轴向力作用下,基于Tsai-Wu 准则,以沿壁厚方向的最小强度比最大化为目标,建立变缠绕角纤维缠绕管的最优化模型。提出将复合形法和梯度法相结合的改进优化算法,通过优化逐层变化的缠绕角使最小强度比最大化,实现强度比沿壁厚更均匀分布。以玻璃纤维管为例,在纯环向应力、环向应力与轴向应力之比为2:1和1:1的3 种工况下,研究不同壁厚条件下最优缠绕角分布及其强度比提升效果和均匀程度。结果表明:优化后结构的材料利用率明显提升,不同工况、壁厚对最优缠绕角的分布规律影响很大;最优缠绕角可以实现沿壁厚等强度。 相似文献