Modeling and analysis of tension system used in rotating yarn compensation carrier

Abstract

The leveraged carrier makes the yarn have a certain tension through the lever. However, the length of the lever greatly limits the yarn storage capacity of the carrier, especially for some large end braiding machines. When the carrier moves from the outer horn gear to the inner one, the distance between the carrier and the braiding ring is greatly reduced, and the yarn storage is difficult to satisfy the requirement, which seriously affects the preform quality. On the other hand, the yarn tension control of leveraged carriers is not stable, there are many sudden change points, which is easy to cause yarns abrasion, fuzzing and even fracture. To solve these problems, a rotating yarn compensation carrier is designed, and the dynamic model of the yarn system is established. The motion law of carriers on the four-layer end braiding machine is studied, and the kinematic model of the yarn traction system is established. Moreover, the yarn tension of carriers in the feeding and recovering stages are analyzed. The curves of the yarn tension and key structure movements are drawn by MATLAB software to study the influence of yarn winding number on the yarn tension. The numerical analysis results show that the yarn storage capacity of the rotating yarn compensation carrier can meet the working requirements of the 4-layer end braiding machine, and the yarn tension can be maintained with stable changes by increasing the number of winding turns of the rods.