Model Analysis & Design Of Screwy Pipe For Can Coiler Of Drawing Frame

Cotton wool becomes continuous strip semi-products after the process of cleaning and combing, but it still cannot become fine yarn through loop spindle fine yarn machine or new spinning machine. Because there's still a gap in the quality and structure between the raw sliver and yarn, all these will affect the quality of the yarn. Therefore, raw sliver needs the further process of drawing frame.In the process of yarning, the sliver needs to be circled and put regularly in the barrel for the use of next procedure. The framework of the circling is called circling framework. The function of coiler can is to make the sliver outputted by roller place in the barrel in the trail of cycloid. If using the line tube in coiler can, the problem of jam and disorder will appear on the condition of the mixture of chemical fiber and cotton, which restrict the normal production. To solve this problem, Yuan Jinshan designed screw curve coiler can. After the on-the-spot experiment in textile factory, the improvement is effective and feasible. But what Yuan Jingshan did is only the brief qualitative analysis of force and movement of sliver in the screw tube instead of the quantity analysis. So the curve concluded by his is not he optimized one with theoretic significance.According to the dynamics analysis of the cotton sliver coiling process, this paper considers minimum friction as objective function and explains the design of screwy pipe of coiler can based on the theory of the variational direct-method. This screwy pipe makes use of centrifugal effect from rolling can coiler and makes friction minimum. As a result, this screwy pipe avails the smoother output of cotton sliver; the decrease of jam frequency of the screwy pipe on the coiler can and coiling turbulence to some extend; better adaptability of high-speed manufacture process of modern draw frame.The actual structure is affected by the dynamic load of time variation. When the difference of dynamic load and static load is minor, we can ignore the effect of dynamic load and calculate the static load only. If the dynamic load is obvious, or when the force frequency is close to some fixed frequency, the strong vibration of the structure will happen so that the inside dynamic stress leads to the rupture or unaccepted distortion. In this case, vibration analysis is necessary.Traditional coiler can speed of drawing frame improves, its high speed of revolving increase the possibility of the damage and invalidity of the bearing and tooth belt connecting the coiler can. The effective working time reduces, the vibration of coiler can becomes the problem to be analyzed and improved. To distinguish the model parameter of coiler can, evaluate the dynamic characteristics of current structure by the theory of vibration and finite elements. And it provides the data foundation for the forecast and optimization design of structure dynamic characteristics & structure modification. It reduces the effect of vibration upon the bearing and tooth belt which meets the technical and production requirement.This paper applies Solidworks to build the 3-dimention model of ASFA328 coiler can, Ansys finite elements software to calculate the theoretic model frequency, Cras experiment model software to come out the experiment model frequency. In the model analysis of experiment, 2ways were selected, one is using the soft sponge as the support of coiler can, and the other is the rubber rope to suspend the coiler can, choosing the MISO method. The finite elements model analysis and experiment model analysis supplement each other and get the coiler can model parameter from both the theoretic and experimental points of views. It evaluates the dynamic characteristics of current structure system, analyze contrastively the theoretic model frequency and experimental model frequency, primitively carry out the dynamics modification of the coiler can which provides the analytical basis and experiment data for the improvement of dynamic characteristics of coiler can.