Analysis and modeling for the dynamics of the nipper mechanism considering jaw’s impacts

IF 2.2 4区 工程技术 Q1 MATERIALS SCIENCE, TEXTILES Journal of Engineered Fibers and Fabrics Pub Date : 2024-01-01 DOI:10.1177/15589250231215456
Boyan Chang, Yang Zhou, Guoguang Jin, Dong Liang, Fangxiao Han, Zhimin Wang
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Abstract

The comber is very important in the spinning for high quality yarns, in which the nipper mechanism (NM) determines the quality of the yarn it combs. This paper is to connect topology and multi-body dynamics to reveal the principle of impact motion of the nipper mechanism. Firstly, the working process of the NM is analyzed and corresponding kinematic models of work sub-phases are derived. Subsequently, the transition from the work phase of the jaw closed to the opened is studied. The research results show that during the transformation process, the mechanism presented another work phase with multiple impacts, which is the main reason why the NM could not stably clamp the cotton clump and thus affect the quality of the yarn combed by the comber. According to the relative coordinate method, the dynamic model of the NM is set up. Combining the classical collision theory and the restitution coefficient equation, the acquisition of the impact impulse generated at the jaw and the subsequent motion of the mechanism are decided. Finally, the NM in the E62 comber is taken as an example to verify the correctness of the established dynamic model, and the influences of different input speeds, restitution coefficients, and stiffness coefficients of spring on the jaw’s impact are studied. This has certain theoretical value for improving the speed and efficiency of the comber.
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考虑到钳口的冲击力,对夹钳机构的动态进行分析和建模
梳棉机在纺制优质纱线的过程中非常重要,其中的钳口机构(NM)决定了其所梳理纱线的质量。本文旨在将拓扑学和多体动力学联系起来,揭示夹纱机构的冲击运动原理。首先,分析了 NM 的工作过程,并推导出相应的工作子阶段运动学模型。随后,研究了从钳口闭合到张开的工作阶段的转变。研究结果表明,在转变过程中,机构呈现出另一个具有多重冲击的工作阶段,这是导致 NM 无法稳定夹持棉团,从而影响精梳机精梳纱质量的主要原因。根据相对坐标法,建立了 NM 的动态模型。结合经典碰撞理论和复原系数方程,确定了钳口处产生的冲击冲量的获取和机构的后续运动。最后,以 E62 梳齿机中的 NM 为例,验证了所建立动态模型的正确性,并研究了不同输入速度、复位系数和弹簧刚度系数对钳口冲击力的影响。这对提高梳理机的速度和效率具有一定的理论价值。
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来源期刊
Journal of Engineered Fibers and Fabrics
Journal of Engineered Fibers and Fabrics 工程技术-材料科学:纺织
CiteScore
5.00
自引率
6.90%
发文量
41
审稿时长
4 months
期刊介绍: Journal of Engineered Fibers and Fabrics is a peer-reviewed, open access journal which aims to facilitate the rapid and wide dissemination of research in the engineering of textiles, clothing and fiber based structures.
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