The Design And Optimization Of Multi-rapier Loom's Structure

Three-dimensional textile composite material is a new type of composite material.In particular,out of the overall textile preform,the composite material is used as a reinforcement which may cause interlaminar shear strength of the composite material,impact damage resistance,toughness and strength,modulus than achieve a better state.In addition,since this composite material is light weight,stiffness,corrosion resistance,high temperature,etc,make it draw much attention and applications in the fields of aerospace,defense industry,transportation,automotive,shipbuilding,energy and so on.3-D woven have been the first choice to weave 3-D fabrication for its low cost,high efficiency and mature processing technology.Multi-rapier loom is one of the casting molding equipment.This paper tried to combine the flexibility of traditional loom weaving process and the formability of fabrication existing in multi-rapier loom.And this paper tried to design a kind of multi-rapier loom which could reduce yarn abrasion and improve product's adaptability from the point of analyzing fabric weaving process.Secondly,this paper analyzed all kinds of basic organizational structure of the three-dimensional fabric,and proposed a new type of profiled weaving process on the basis of the structure forming method.And the paper designed the looming draft of weaving rod and tube to verify the feasibility of this new type of weaving process.According to the constituent mechanisms which could implement the new process successfully,it respectively analyzed the system structure,key technical issues and design principles of the multi-rapier loom,and designed the weft insertion mechanism,beating-up mechanism selvage system and shedding mechanism of the multi-rapier loom,ultimately completed the basic assembly drawing.Then this paper made a further research on the classification of selvage system.According to the requirements of the physical prototype,it exploratory put forward the design scheme of two kinds of yarn carrier.It build up the mathematical model of yarn carrier's collision based on the collision characteristics of selvage system,and has carried on the simulation analysis of two kinds of structure by using the simulation software ANSYS,which made sure that the circular cross section structure of yarn carrier is morestable.In addition,the yarn-content will also be impact on the performance of yarn carrier structure.This paper put forward several design scheme of parallel beating-up mechanism based on the traditional beating-up mechanism in the design of parallel beating-up mechanism.After getting various institutions plan analyses in kinematics with the help of ADAMS simulation software,it chose the “elbow mechanism” as the final solution,and carried on the detailed design about beating-up mechanism.Putting the reed the important component in the beating-up mechanism as the research object,it deduced the reed force equation when beating-up three-dimensional fabric according the reed worked in the two-dimensional fabric.It got the reed solved and strength checked in different cross section load.Finally,the mode analysis was carried out on the rack for providing a reference for the designing of other mechanism to avoid resonance occur when the machine working condition.The analysis results show that when it at the first-order modal the frame vibration is easy to make the key components of the loom damaged.As the frame structure was improved,the whole stability of frame,natural frequency and the ability resistance the deformation of frame when resonance time were improved effectively.