共查询到18条相似文献,搜索用时 99 毫秒
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为给高质量簇绒地毯的开发提供设备保障,针对运动副铰链中存在间隙的问题,以DHGN801D-400型簇绒地毯织机耦联轴系的主轴系统为研究对象,介绍了簇绒地毯织机耦联轴系的组成部分,分析了针机构的运动特性。考虑到簇绒针机构中3处易磨损的铰链间隙,基于虚拟样机ADAMS软件得到不同间隙下簇绒针的位移、速度、加速度及铰链支反力,从而根据针位移分析铰链间隙对毯面绒高的影响。再以铰链点坐标及杆长为设计变量,以铰链副间的冲击力和针行程最小为优化目标,对该簇绒针机构进行多目标优化,得到最优的铰链坐标及杆长,将铰链间隙对绒高的影响降到最低。 相似文献
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针对地毯簇绒机成圈运动的时间配合关系与簇绒工艺要求之间不匹配会影响地毯质量的问题,首先提出地毯簇绒过程中时间配合的分析要点,以指导成圈机构的结构设计和相位关系的确定。通过Adams运动分析,获得传统成圈运动机构的时间配合关系,指出该时间配合关系的不足之处,由此提出2种基于非简谐运动方式的成圈运动机构的时间配合方法,并进行了相应的执行机构设计。经过Adams运动分析验证该成圈运动机构可较好地满足地毯簇绒工艺要求。 相似文献
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针对我国地毯织造技术基础研究相对薄弱的现状,为给平割平圈地毯织机设计提供更多的理论指导,首先参考时间圆图设计方法和一般割绒地毯织机的工艺要求,提出平割平圈地毯织机簇绒针和成圈钩组件的运动时序关系。然后通过对连续圈绒、割绒和圈割绒交替簇绒时的成圈工艺分析,指出成圈绒时簧片的动作稍超前于成圈钩的远止点时刻,成割绒时簧片动作最晚时刻在成圈钩的远止点时刻,得出平割平圈地毯织机的运动时序关系图。由于平割平圈地毯织机的簧片运动由电气控制实现,独立于由主轴驱动的针、钩、刀的运动体系,因此,运动时序的分析和设计可为成圈机构的机械设计、电气控制系统的设计提供理论参考。 相似文献
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为解决多色提花钩刀割绒系统在移针时整个系统的横移问题,根据簇绒地毯割绒的形成原理,设计了一种新型的用于簇绒地毯织机上的钩刀割绒机构,能准确完成勾纱-脱纱工艺。根据这套钩刀割绒机构的机构简图,分成3个封闭多边形,对每个封闭多边形依据其矢量关系,建立矢量方程式,并利用欧拉公式简化方程,进行实部与虚部分离得到构件位移;接着对相关方程式讨论其一阶导数、二阶导数分别得到构件的速度、加速度的数学求解式。通过这些求解式运用Mat Lab进行编程,计算所求量,得到各构件的运动规律,以及成圈钩的角位移、角速度和角加速度的变化曲线。 相似文献
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为降低纺织车间簇绒地毯装备的低频噪声,将噪声主动控制的滤波最小均方算法 (FXLMS)引入纺织机械噪声控制领域。以英国柯贝尔 1/8针距簇绒地毯织机为研究对象,建立了噪声主动控制系统模型,根据现场情况布置传感-作动单元;并运用双传声器离线通道辨识方法估计初级和次级通道传递函数;针对前馈控制策略引起的次级声反馈现象,选用参量阵扬声器作为次级声源减轻该现象对噪声控制系统稳定性的影响。最后对簇绒地毯织机噪声的主动控制仿真研究和实验验证了该方法的可行性和有效性。实验结果表明:簇绒地毯织机采用的主动噪声控制方法对低频段噪声的控制效果较中高频段好,簇绒地毯织机噪声主要频率点的噪声消声量最大可达9.8 dB。 相似文献
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DirectCablingofTuftedCarpetYarnsbyVolkmann1.概述将绒纱或碎布条插入机织粗底布生产简单地毯或床单的技术在世界许多地方已有数百年的历史了,但是直到1950年Cobble兄弟研制出第一台簇绒机后,才使宽幅簇绒地毯的牛产成为可能。经过几十年的改进,目前簇绒法已经成为地毯生产的最重要的方法。簇绒地毯以其丰富的颜色、结构和图案设计以及舒适的纺织外观而深受欢迎。簇绒地毯所用纤维材料的性能是除地毯结构之外,影响其性能的最重要因素。簇绒地毯一般用以下五类纤维:聚酚胺纤维、聚丙烯纤维、聚酯纤维、聚丙烯睛纤维和羊毛。聚酸胺… 相似文献
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Tufted carpet is one of the most used carpets. The penetration force of needle is an important factor in tufting process. Few know how to calculate the penetration force during the tufting, although the principle is one of the least understood processes. This paper presents our research on using finite element method (FEM) to study the penetration force of needle during tufting. In this study, the model is developed using ABAQUS software, and the material properties of nonwoven fabric are approximately modeled by linear elastic orthogonal anisotropic continuum. The required engineering constants were obtained from experimental test. A user-defined subroutine VUMAT for characterizing the constitutive relationship of the orthogonal anisotropy nonwoven fabric and the damage evolution was compiled and connected with a commercial software package ABAQUS/Explicit to calculate the penetration force. At the same time, needle penetration force was tested by sensor mounted on needle bar of tufting machine. It was found that there is an approximate agreement of the penetration force between FEM calculations and experimental results. The reasonable agreement proves the validity of finite element analysis model, which could be used to calculate the impact response of the needle penetration stress precisely. The finite element model has been verified experimentally and can be used to study the influence of the key tufting parameters such as the backing material properties and the needle geometry on penetration force, which is vital for designing needle and driving mechanism. 相似文献
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为掌握电动地毯织枪的使用方法和调试方式,提高织枪的织造质量,以常规电动地毯织枪为研究对象,研究了织枪机械结构特点和工作原理,根据建立的数学模型用Mat Lab-SIMULINK对织枪的主要运动机构双曲柄滑块机构进行运动学仿真和时序分析,明确了解针刀的配合要求,获得了机构的运动规律。结果表明,压布板在钢针尖和剪刀尖运动曲线交叉点位置之下,可以满足织枪的工作要求。依据运动学方程得出不同绒高对应的可调节杆长最优值,并得出可调节杆长的调节趋势,所得的理论数据可用于对织枪进行辅助调试,减少了调试时间。 相似文献
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J. I. Dunlop 《纺织学会志》2013,104(3):123-136
An attempt has been made to analyse the yarn tensions developed during tufting. The input yarn tensions were measured on a Venor carpet-sample-tufting machine and related to the characteristics of the machine. Estimations were made of the maximum tensions developed during insertion of tufts into the backing fabric by measuring the upward force on a needle during tufting and relating this to the input tension. Measurements on commercial tufting machines indicated, that the tension patterns developed in the yarn delivered to the needles were similar to those of the Venor machine and that an approximation to the maximum tensions developed during tuft-insertion could be realized by using the data obtained from the Venor-machine experiments. 相似文献
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针对簇绒地毯织机高速运行时横移机构易出现机械谐振,影响横移系统快速响应和稳定性的问题,在对横移传动机构进行理论建模的基础上设计了校正补偿装置。首先根据横移传动系统的阶跃响应情况,采用双T型陷波滤波器消除了横移传动系统的机械谐振点。然后使用预变形双线性逼近法对陷波滤波器进行离散化处理,并且与零阶保持器和一阶保持器等离散算法进行了实验对比。结果表明,双T型滤波器有效地消除了横移机构高速运行时产生的机械谐振,而且在频域特性方面,采用预变形逼近法设计的离散陷波滤波器可获得比零阶和一阶保持器更加准确的逼近效果。 相似文献
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The beat‐up process has a great influence on the structure and appearance of the handmade carpet. Since all weaving processes of the handmade carpet are performed by the weaver, the production speed may be increased and the performance of the weaver may be improved by designing a suitable beat‐up mechanism. In this article, a crank‐rocker type of four‐bar mechanism has been studied for the handmade carpet loom beat‐up mechanism. First, the functional requirements of the beat‐up mechanism were established according to the problem statement. Later, a four‐bar crank‐rocker‐type mechanism was generated and developed from a slider‐crank‐type mechanism. Here, the dimensional synthesis of the mechanism was made as a solution to the slider‐crank‐type mechanism. Many alternative mechanisms were generated as a result of the dimensional synthesis. The slider‐crank‐type mechanisms were then translated into the crank‐rocker‐type mechanisms. These mechanisms were evaluated in terms of some mechanical criteria and the most suitable one was selected. Finally, a kinematic analysis of the beat‐up mechanism was performed. 相似文献