片式多源喷气引纬技术研究

Research on sheet-type multi-source jet weft insertion technology

在国家提出的2060碳中和目标的大背景下,节能降耗成为目前工艺提升与改进的重点。当前主流的以辅助喷嘴结合异形筘的喷气引纬技术,由于其引纬结构近似敞开的气流引纬通道,在引纬过程中耗气量较大。本文基于原有管道片式引纬工艺,提出了一种新型片式多源喷气引纬技术,以减小引纬耗气量。在多源喷气结构设计基础上,利用流体仿真软件,建立了0.2、0.3、0.4 MPa三个供气压力下的流场仿真模型,通过数值仿真结果与传统辅助喷嘴结构下的比对,本文所提出的新型引纬工艺在同等供气压力条件下,引纬气体速度分别提升了19%、5%、2%,同时耗气量在0.3、0.4 MPa压力水平下分别降低了8.4%与8.7%。最后,在搭建的原型系统平台上,实验验证了仿真结果的正确性。

In the modern textile industry,the air-jet loom has developed rapidly with its advantages of high speed and success rate of weft insertion.During air flow insertion,the air-jet loom relies on the high-speed airflow from the main and auxiliary nozzles to pull the weft yarn,and the weft yarn is straightened and quickly passes through the weaving mouth.This weft insertion method makes the yarn move quickly and steadily in the weft insertion flow field and realize high-speed and efficient weft insertion.Since the air-jet loom is of semi-open structure,a large amount of compressed gas consumption is generated during the process of intersection of airflow.Furthermore,the integration of the auxiliary profiled reed and the airflow channel involves complex shapes and high cost,which makes it difficult to adapt to the requirements of frequent fabric changes.Therefore,in response to the national carbon neutrality and carbon peak policy,the realization of green manufacturing,the reduction of gas consumption in the weft insertion process of air-jet looms has become the focus of air-jet weft insertion process innovation.In this study,a new sheet-type multi-source air-jet weft insertion technology was proposed for reducing the gas consumption in the process of weft insertion based on the original pipe sheet-type weft insertion process.Firstly,a new air-jet weft insertion channel was designed,and the flow field simulation model of the new channel was established.Secondly,the flow field characteristics of the new insertion channel at 0.2,0.3 and 0.4 MPa pressure levels were numerically analyzed.Finally,the experimental platform was built to verify the reliability of the simulation results,and the airflow velocity at the central axis of the flow field was obtained to be compared with the numerical simulation results.The study shows that the maximum velocities of in the new insertion channel are 93.42,127.35 and 151.57 m/s at the pressure levels of 0.2,0.3 and 0.4 MPa,respectively,and the maximum velocities of the sheet-type multi-source weft insertion technique are increased by 19%,5%and 2%,respectively,compared with the conventional air-jet weft insertion technique,and the decreasing trends of the velocities are similar to those of the conventional air-jet technology.In addition,the gas consumption of the sheet-type multi-source technique is 1.24 and 1.57 g/s at the pressure levels of 0.3 and 0.4 MPa respectively,8.4%and 8.7%lower than that of the conventional air-jet weft insertion technology.In this paper,the flow field simulation analysis and experimental verification of the proposed sheet-type multi-source air-jet weft insertion technology are carried out.However,the influence of the main nozzle air flow is not considered,and the devices among the sheets at high-speed situation are ignored.The analysis of the synthetic flow field characteristics of the main nozzle and weft insertion channel and the applicability of the devices at high-speed situation mode are to be researched.