Process Research And Mechanism Optimization Design Of Three-dimensional Fabric Hemming

The three-dimensional fabric has good overall structural performance,and the composite materials with high-performance three-dimensional fabric as the skeleton are widely used,among which the belt core fabric conveyor belt formed by multi-layer three-dimensional fabric with belt core as the skeleton is an important part of mine conveyor.At present,the single rapier loom is the equipment for weaving multi-layer three-dimensional fabric with core,which has low weaving efficiency.The forms of selvage locking include shuttle selvage and single crochet selvage.The tensile strength of the selvage is low,and the reliability of the selvage will be poor under high-speed operation.In view of the above problems,this paper puts forward the overall design scheme of multi rapier loom,and mainly focuses on the three-dimensional fabric selvage The main research contents are as follows:(1)This paper analyzes the weaving principle of multi rapier loom,puts forward the design scheme of multi rapier loom,and carries out time sequence analysis and design for the main mechanism of the loom.This paper analyzes the existing selvage technology,and innovatively designs a new type of hemlock technology of five hook needle weft loop nested interlock and side yarn weft threading nesting,which provides process reference for the design of selvage mechanism.(2)Through the organization structure of three-dimensional fabric and the weaving process of multi rapier loom,this paper analyzes the requirements and functions of three-dimensional fabric's selvage,puts forward three kinds of selvage principle schemes,selects the optimal scheme,and designs a new type of selvage mechanism according to the scheme innovation,including three parts: transmission mechanism,yarn shedding mechanism and crochet mechanism To achieve the purpose of three-dimensional fabric selvage.(3)In the high-speed running state of multi rapier loom,the locking mechanism needs to ensure a certain degree of reliability.By designing the modified trapezoidal acceleration motion law of the transfer mechanism,the influence of the transfer mechanism on the weft yarn during acceleration or deceleration is reduced;the static and modal analysis of the key components of the transmission mechanism,the yarn feeding fork,is carried out to avoid resonance in the actual work;ANSYS is used to analyze the key components of the transmission mechanism Through the parameter optimization design and reliability analysis of the feeding fork,the results show that the structure of the optimized fork is more reasonable,which can enhance the stiffness and reduce the weight,and has high reliability.This study provides a theoretical basis for the design and optimization of the lock mechanism.(4)In order to reduce the wear of weft yarn and improve the quality of selvage,the kinematics analysis of crochet mechanism is carried out,and the crochet trajectory and crochet motion are simulated by MATLAB and Adams,so as to obtain the four bar parameters that the trajectory of crochet needle is approximate to straight line and has no impact during operation.(5)According to the design scheme of multi rapier loom,the experimental platform is built,and the existing glass fiber is used for trial weaving.The experimental results show that the weaving efficiency of the loom is increased by nearly four times,the selvage mechanism is reliable and can form high-quality selvage.The multi rapier loom proposed in this paper greatly improves the weaving efficiency,and the designed selvage mechanism solves the defects of existing three-dimensional looms.Through the optimization and theoretical analysis of the selvage mechanism,it is ensured that the selvage mechanism can reliably complete the selvage when the loom is running at high speed.This paper provides a reference for the research and development of multi rapier loom.