The Research On Manufacturing Of Three-Dimensional Orthogonal Fiber Reinforced Composite Box Beam Structure And Virtual Prototype Of The Loom

Due to improper construction,structural aging,poor environment,overloading and many other reasons,many existing bridges are seriously damaged,the structural innovation of the bridge has become an urgent task.In order to solve these problems,this paper puts forward the idea of using fiber reinforced composite material instead of some reinforced bars,and produce a new type of box beam structure fiber reinforced concrete bridge,so as to solve the problem of the bridge in the occurrence of fracture.The three-dimensional weaving method is used to weave three-dimensional orthogonal fiber reinforced composite box beam structure preform,and vacuum assisted resin transfer molding(VARTM)and other technology are adapted to create a new type of box beam structure fiber reinforced concrete bridge.Three dimensional orthogonal fiber reinforced composite box beam structure woven fabric,by tying up the yarn in different ways,it can get the different complex structure three-dimensional orthogonal fabric.In this paper,based on the traditional two-dimensional loom,according to the structure of the three-dimensional orthogonal box beam bridge,3D woven fabric structure is introduced,and the innovative design of shedding mechanism,weft insertion mechanism,beating up mechanism and loom frame are done.This paper focuses on the development of the virtual prototype of the three dimensional orthogonal weaving machine.The main contents are as follows:1)The structure of the three-dimensional orthogonal fiber reinforced composite box beam structure is designed,and the simulation calculation and the forming process of the three-dimensional orthogonal fiber reinforced composite box beam structure are studied.2)The innovative design of the shedding heald frame and bundling heald frame of the loom are done,the dynamic characteristics of the bundling heald frame are analyzed in ANSYS Workbench software,and the three-dimensional woven fabric pattern in different interleaving methods in the weaving process is studied.3)The weft insertion mechanism for three-dimensional orthogonal weaving machine for weaving the box beam structure is designed,and a new combined mechanism of non-uniform rotation transmission mechanism and the cylindrical gear and gear rack steering mechanism is also designed.This mechanism can realize the conversion of uniform motion into variable speed motion,and it can insert the weft yarns to weaving center without any guiding device.The weft yarn is always control by rapier head.The mechanism can achieve the initial speed of weft insertion accelerated in a short time and quickly decelerated when the weft is transferred.What's more,the rapier have high speed when it return,which shorten the return time,so the weaving efficiency increased,and it can better improve the productivity of the loom.4)A reinforcement mechanism parallel beating device are designed and analyzed.The beating up mechanism can push multi weft(in broad and thick box beam structure)into the cloth fell horizontally,and make each yarn have the same impact force,So it is very good to guarantee the structural performance of three-dimensional orthogonal fiber reinforced composite box beam structure preform.5)The innovative design of the loom frame of the three-dimensional loom is done,and the modal analysis and harmonic response analysis of the loom frame are conducted in ANSYS Workbench.All of these can provide a reference for the innovation of the loom frame.Through three dimensional modeling,we obtain the simple model of the virtual prototype of the three dimensional orthogonal loom,which opens up a new way for the design of the 3D loom.