Correlation Analysis And Experiment Of The Process Of Pulling The Tumbling Of The Soft Bag

In this paper, the characteristics and advantages of tubular fabrics, the application status in various fields, and the research progress in all aspects of the tubular fabric in recent years were summarized. The application of account of the Euler formula and the conditions of usage in the textile industry were explained. The modified Euler formula corrected to suit for different conditions by the domestic and foreign scholars were analyzed. This paper started with thin plates which has a smooth arc in one of the end, analyzed the process of a woven fabric sheet moved on the surface and rounded the small curvature end. Considering the thickness of the plate is small, the size is about 1mm, so it is hardly possible to machine a perfect half circle in the guide head. According to the processing characteristics, the lengthwise section curves of the guide head were respectively to be synthesized in the form of two parabolic and cubic curves, than the corresponding modified Euler formula were obtained. By comparing the theoretical values of this two modified form with the experimental results, the correction results of the parabolic form were more close to the actual values.Thereby determined the correction coefficient of Euler formula in the size range of this paper, which lay a good foundation for the research of soft bag movement.The procedure of a tubular soft bag turned inward to a pipe is more complex than that a woven fabric sheet moved on the surface and rounded the small curvature end. Based on the modified Euler formula, combined with the radial tightening force of soft bag, used the theory of calculus, this paper analyzed the stress between and after the tubular soft bag turned inward to a pipe, and the mechanical model of core pulling force under no-load condition was also obtained.The paper analysed of the factors that may affect the size of the core pulling force under no-load condition by single factor analysis of variance and multi factor analysis of variance considering interaction, including:feeding speed^ the length of soft bag coated in pipe、the number of rubber ring and the core pipe. The paper got the following conclusions:the impact of feeding speed is not significant on the core pulling force without consider other factors, but the influence of the length of tubular soft bag coated in pipe、the number of rubber ring and the core pipe can not be ignored, because their effect were significant.On the basis of existing experimental instrument, and combined with the actual working conditions, this dissertation took the progress that the core pipe vertically downward moved and the tubular soft bag was forced to turned inward to the pipe as that the core pipe to maintain static and the soft bag turned inward on its own initiative by the tension sensor along the horizontal direction, a set of simple test device was designed and the reliability of the device was also tested.Through the test device and the result of significant analysis, changed the experimental conditions, the relationships of various factors and the core pulling force were explored, and the conclusions are as following:At the same feeding speed, with the time extension, the length of soft bag coated in pipe decreases, the no-load core pulling force decreases too, and the trend is almost linear, as same as the theoretical results; At the different feeding speed, as long as the length of the coated are equal, the no-load core pulling force are very similar; When other conditions are the same, with the increase of the rubber ring number, the no-load core pulling force increases gradually.