Vibration Modal Analysis And Improvement Of Can Coiler

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.The can coiler being used nowadays has heavy mass and big volume,which cause the waste of material and energy,and also become an obstacle of high speed orientation.On the other side,with the high speed orientation of framework,the requirements of machine running speed,bearing capacity,working life is becoming higher.Due to the high speed revolving of can coiler,the vibration is transferred to the connected bearing,dentiform belt,etc. making the parts on the drawing frame easier to become worn,ineffective,and reducing available working time.As a result,on the basis of guarantee the performance of can coiler,performing light weight orientation improvement of the structure should be solved.This paper applies CRAS vibration and dynamic signal collection and analysis system is used to test the experimental modal parameters of can coiler.Meanwhile Pro/ENGINEER to build the 3 dimension model of ASFA328 coiler can,the model is imported to ANSYS through the direct interface between Pro/ENGINEER and ANSYS,which is applied to analyze the static and dynamic parameters of can coiler. The finite elements modal 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,comparison shows that the modal frequency calculated by finite elements modal analysis and the experimental data in good agreement.On the basis of analysis, we concluded that the current can coiler design is too conservative,and the light weight orientation structural improvement is performed in the 3 D modeling software, and it's static and dynamic performance has been reevaluated in ANSYS.In the earlier period,the linear inclined pipe is used as the tube of can coiler, 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.The quantitative analysis of motion and force is performed by Yibo under the condition of uniform motion,and a parameter function is solved out theoretically,the friction of cotton passing through the pipe is minimum. However he just did the analysis the motion under the regular state when can coiler is revolving in a constant speed.What is more,the boundary condition is too idealized.Usually,the jam of cotton slice happens during the starting period of machine,when the can coiler is accelerating,cotton slice is just entering the pipe.As a result the current theory did not solve the problem.Based on the previous work,this paper performed the dynamic analysis of accelerating cotton slice passing through the inclined pipe,Refer to the actual conditions,set the more strict boundary conditions,applied direct variation method to optimize the pipe curve,inlet angle,outlet angle,and the distance between press roller and inlet.A new curvilinear pipe is designed,this kind of pipe made fully use of the centrifugal force of cotton under accelerating state,reduced the jam frequency of cotton during the machine starting period to some extend.