棉精梳机胶辊的应用与维护

为稳定并提高棉精梳半成品纺纱质量,介绍棉精梳机用牵伸胶辊、分离胶辊及导向胶辊的性能特点,分析胶辊制作、磨砺、表面处理方法及保养维护、周期管理和日常管理注意事项,提出棉精梳工序温湿度控制和减少胶辊缠花的措施。指出:应根据原料特性和纺纱品种合理选择胶辊型号和硬度,保持绒辊清洁、温湿度合理,使胶辊运行状态良好以减少胶辊缠花;要严格按照棉精梳机胶辊的技术要求,强化胶辊的维护管理,对提高半成品纺纱质量和减少后工序断头作用重大;分析生产过程中出现问题的原因,充分发挥胶辊在棉精梳工序的功能,以稳定并提高棉精梳半成品纺纱质量。     

Oerlikon Textile Components：新型牵伸系统

在纺织产业链中,作为中间产物的纱线需紧随日益频繁的时尚变化,尤其是在服装和家用纺织品行业.纺纱机的市场也因此变得更加多样化和短期性,纺纱机显然已经发展成一个买方市场.现如今更是客户决定纱线特征和成纱质量,最重要的是,交付给客户其所需的最终产品.     

Fibre breakage during drafting on ring frame

Fibres are subjected to forces while undergoing drafting in any drafting zone. Various factors, such as fibre bulk, roller setting, roller pressure, draft, fibre length, fineness and friction between fibres, affect the magnitude of this force. It is usually considered that the drafting force in the ring frame is too low to have any consequence as far as fibre breakage is concerned. The present investigation, however, shows a substantial increase in short fibre percentage and reduction in upper quartile length, giving a clear evidence of fibre breakage during drafting process.     

超大牵伸纺纱技术的发展与分析

超大牵伸技术存在的问题主要有:半制品的喂入方式是采用棉条还是粗纱一直存在争执;牵伸机构的牵伸型式仍处于研究阶段,并不成熟;传动机构的传动路线、牵伸调整和传动元件如何选择;各区牵伸倍数如何合理分配以提高牵伸效能等。文章将主要从以上几个方面对超大牵伸进行相关介绍。     

Study on drafting force and sliver irregularity on drawing frame

A new device was designed and constructed on drafting frame to measure the dynamic force during roller drafting. The effects of draft ratio, number of input slivers, and roller velocity on drafting force, coefficient of variation (CV) of drafting force, and the irregularity of output slivers were all analyzed. Rayon and cotton slivers were used in the experiments, respectively, the results showed that the number of input slivers had a significant linear relation with the mean drafting force; the draft ratio had an obvious effect on mean drafting force and CV of drafting force; the lower CV of drafting force promised better output sliver evenness.     

A study of the drafting force in roller drafting and its influence on sliver irregularity

Drafting force is the direct and intuitive factor resulting in fiber motion in a drafting zone. Utilizing data collected from an ITT Draftometer, this paper discusses the effect of draft ratio and ratch in both the break and the main draft zones on drafting force and the coefficient of variation (CV) of drafting force, and how these in turn affect sliver and yarn irregularity. It is shown that: the draft settings in the break draft zone have a significant effect on the drafting force; the break draft ratio shows distinct relationship with sliver irregularity; the ratch in the main drafting zone has considerable influence on drafting force; and in the experiments reported the drafting force does not directly relate to final yarn irregularity.     

Discrete‐event simulation model of roll‐drafting process

This paper presents a model of the roll‐drafting process which is based on the concept of discrete‐event simulation (DES). This model is free of limitations and simplifications which are inherent in the known models of the roll‐drafting process and is able to trace each separated fiber within the roll‐drafting zone. Due to this feature DES model enables investigation of a wide range of roll‐drafting cases and representations. The influence of the parameters of the basic roll‐drafting model was studied. Models of the first and the second limit schemes, models with a randomly distributed velocity change point, and a model with a shifting velocity change point were elaborated and studied on the basis of the basic model of the roll‐drafting process. The effect of the feedback depth was simulated and analyzed in the frame of the model with the shifting velocity change point. The elaborated model and the obtained results will be useful for creating a neural network meta‐model of the roll‐drafting process.     

供电计算与管理系统在煤矿中的应用

矿井供电设计与管理系统能方便、迅速、准确地实现供电系统图的绘制,电网主要供配电设备、线路的短路容量、短路电流、开关保护整定等科学准确地计算,并将数据实时传输到矿井电网监控监测系统中,同时形成相关设计报告。     

牵伸力与并条条子质量的关系

鉴于牵伸力的变化会影响条子质量,利用牵伸力与传感器中应变片的应力与应变之间存在线性关系的原理,自行研制了1套牵伸力在线检测装置。使用这套装置可以正确测量牵伸力的大小,进而研究牵伸力和条子质量之间的关系。采用粘胶生条进行头道并条试验。所用小型并条机的部分调节参数为前罗拉速度、前区牵伸倍数、后区牵伸倍数、并合根数和总牵伸倍数。同时,通过光滑样条方法分析了牵伸力与条子质量的关系。研究结果表明,牵伸力和条干不匀有很大的内在关联性,并条机牵伸力的在线检测值将成为未来控制条子质量的重要指标。     

纺纱牵伸波的产生机制及其消除方法

针对纺纱牵伸过程中的牵伸波问题,分析在罗拉牵伸系统中短纤纱产生牵伸波的机制,认为纤维之间静摩擦因数大于动摩擦因数导致的黏滑运动是罗拉牵伸系统产生牵伸波的主要原因。提出对罗拉牵伸区的纤维束施加高频微幅波,使牵伸区的纤维之间产生高频的微小相对运动,且纤维之间总是处于动摩擦状态,显著降低导致牵伸波的纤维捆绑效果,从而避免黏滑效应,有效地消除牵伸波。这一设想通过实验得到验证。这种方法可应用于新型纺纱牵伸系统的开发。