Research On The Warp Feeding System Of Large-gauge Woven Fabric Loom And Optimization Of Its Core Mechanis

Spacer fabric is a special three-dimensional fabric with good overall structure.Textile composite materials with spacer fabric as preform are widely used in various fields such as aerospace,national defense,medical and health,construction and transportation.Compared with traditional spacer fabric with spacer thickness,the thickness of spacer fabric with large spacer thickness can be adjusted in a wider range,which can meet the requirements of more aspects and has excellent performance.It is the direction of future development.The current domestic production of many great separation interval warp knitting fabric,weaving loom large separation between woven little,compared with large separation warp knitting fabric between large spacing interval woven fabric has good sound-absorbing,sound insulation,air permeability,moisture permeability,structural integrity and formability,and its mechanical performance is good,suitable for high performance composite precast body,However,there is no general loom that can weave such spacer fabric in China.Therefore,the existing loom is reformed to design a loom that can weave large spacing fabric.The let-off system of the loom is studied in detail and the core mechanism of the let-off system is optimized.The main research contents are as follows:(1)According to the structural characteristics of large spacing woven fabric,the weaving process and weaving principle are analyzed,and the overall loom design scheme is put forward;The timing sequence of loom main mechanism is analyzed.(2)According to the design requirements of the system,the structure of the let-off system composed of the let-off mechanism before and after the opening is designed,and the entity models of the feeding mechanism,the dragging rod and the dragging mechanism in the let-off mechanism are determined.(3)In order to improve the stability of the drawrod,the force analysis and modal analysis were carried out to determine the force and vibration frequency.The structure of drawrod is optimized by ANSYS platform so as to reduce the deformation of drawrod.Based on Hertz collision theory,rigid-flexible coupling vibration simulation of drag rod was carried out by Recur Dyn simulation platform,and the vibration displacement of drag rod head was obtained.The analysis results show that the optimal design of drag rod is reliable.(4)In order to improve the stability of the dragging rod movement,the force model and vibration model of the dragging rod were established,and the statics analysis and modal analysis of the dragging rod were carried out through ANSYS,and the force situation and the first 6 natural frequencies were obtained.;According to the analysis results,the response surface method is used to optimize the structure of the dragging rod,so as to achieve the purpose of reducing the deformation of the dragging rod.(5)In order to study how to maintain the stability of the pile warp tension during the dragging process,the movement of the pile warp yarn during the dragging process is analyzed,and the pile warp tension control model is established.Two tension control methods are proposed for simulation experiments.The experimental results show that the fuzzy PID control method The control effect is better,and the velvet warp tension fluctuation is smaller.The warp let-off mechanism behind the weaving mouth designed in this paper solves the weaving problem of large-gauge interval woven fabrics,and provides reference and reference for the research and development of large-gauge interval looms.