Research On The Dynamic Balloon Of Ring Spinning Based On The Whisker-mechanical Coupling Mechanism

Textile industry is an important industry for people's livelihood,as a traditional pillar industry in China,it has obvious international competitive advantages in the world.It shoulders an important historical mission of people's livelihood industry development in the new era."Intelligent manufacturing","green environmental protection" and "quality improvement and efficiency"have become the innovative themes of the textile industry,which puts forward new requirements for the development of ring spinning machine.Spinning process is the last process of yarn forming.The quality of the spinning process directly affects the use of thread making and weaving.The main processes of spinning are drafting,twisting and winding forming.At present,the ring spinning frame are using electronic twist and electronic drafting technology at home and abroad,and the winding molding technology has been developed very mature.However,the research of spinning balloon theory could not meet the needs of spinning machine high-speed development.In this paper,the balloon section in ring ingot spinning process is taken as the research content.Through theoretical derivation,numerical solution and analysis,and experimental verification,the balloon shape and yarn tension in ring ingot spinning process are comprehensively and systematically studied and analyzed.Firstly,the spinning process of ring ingot spinning was analyzed.Based on the whisker and mechanical coupling mechanism,on the theoretical basis of dynamics,the mathematical model of spinning dynamic balloon was established for the first time considering Coriolis inertia force and air resistance,and the boundary conditions of the balloon shape in spinning process were derived.The mathematical model is nonlinear and influenced by many parameters.In order to solve the model numerically,the method of balloon form initial parameter identification based on genetic algorithm was proposed in this paper,the method was used to seek uncertainty parameters which conform to the goal of optimizing,then the initial parameters values of spinning balloon dynamic mathematical model were obtained,which conform to the requirements of the process.Secondly,on the base of the previous research,the balloon with and without balloon control ring was studied,and the balloon morphology in the two states was obtained.It was found that the balloon morphology and spinning tension fluctuation in the small yarn stage were controlled after the balloon control ring was installed.The influence of parameters on balloon shape and spinning tension was discussed in detail in the absence of balloon control ring.On the base of the above analysis,three methods to stabilize spinning tension and reduce yarn breakage by controlling the balloon shape were proposed.Finally,for testing the reliability of spinning dynamic balloon,a testing platform was built,and an image processing method based on actual yarn curve was adopted.First of all,a high-speed camera was used to collect the balloon space curve during spinning.Secondly,Halcon image processing software was used to extract the feature poiints of the collected balloon space curves.At last the characteristic points obtained by experiments were fitted and compared with the theoretical spinning balloon curve to analyze the causes of errors.On this basis,the theoretical model was modified to ensure the accuracy and reliability of the spinning dynamic balloon theoretical model.This paper provided a theoretical basis for the study of balloon shape and tension under high-speed spinning state,for reference for the further study of whisker and mechanical coupling mechanism.It provided a theoretical basis for reducing the yarn breakage under high-speed spinning,and a theoretical support for the design of a new ring spinning machine.