一种纬纱加夹持物气流引纬方式的提出及分析

Air-jet Weft Insertion Method for Weft Yarns with Clamp at End and Its Analysis

为优化气流引纬以获得更好的引纬效果,根据纱线表面突起物对牵引力的影响特性,提出一种在纬纱线末端设置夹持物的改进型气流引纬方式。通过实验以及理论分析选取了适用于改进型气流引纬方式的夹持物。利用Hypermesh建立夹持物与纱线在引纬流场中的有限元模型,并通过Fluent中动网格技术模拟0.3~0.5MPa的供气压力下夹持物与纱线在引纬流场中的飞行状态。同时,采用高速相机拍摄夹持物与纱线的飞行状态,得到夹持物与纱线的速度与仿真速度进行比较,以此验证仿真的正确性以及新型引纬方式的合理性。结果表明:通过实验以及数值计算选择得到的夹持物在合理供气压力下能较好地在改进型引纬系统中完成引纬,并且达到了增大纱线牵引力、增加品种适应性以及节能减耗的目标。

To optimize the weft insertion effect of the airflow,an improved weft insertion method of weft yarns with a clamp at the tail end of the yarn is proposed according to the influence of the protrusion of the yarn surface on the drag force.Through the experiment and numerical calculation,the grip suitable for the new airflow weft insertion method is selected.The flying state of the yarn with clamp under the pressure of 0.3~0.5 MPa is simulated by the Dymamic Mesh technology in Fluent and taken by high-speed camera.The speed of yarn with clamp is compared with the simulation one.The result is used to verify the correctness of the simulation and the rationality of the new method of the weft insertion.Results show that the grips selected can be used to fully do the weft insertion in the improved weft insertion system under a reasonable gas supply pressure.The drag force and the adaptability are improved and the energy consumption is reduced.