Abstract:

In order to improve the folding efficiency and stability of a pure pneumatic tucker,invagination theory of a pure pneumatic tuker was studied, and a 2 - D yarn-airflow field coupling model with a pure pneumatic tucker was established to simulate the folding process of the length of 10 mm yarn. The final folding process of yarnin the comparison experiment could be used to analyze interaction of yarn and airflow field and comprehend yarn's mowement rule under the oblique and folding airflow. In the simulation, the oblique airflow has an effect on the yarn and drives yarn to move to the direction of - y. When the yarn is bent to a certain degree, the folding airflow is opened, the oblique air flow is closed and driven yarn moves to the direction of - x, then the folding is finished. The results show that with the function of incongruous jet flows field, the 10 mm yarn can complete the folding process within 5.7 ms, which can be used for the optical edge processing of the shuttleless loom with the rotation speed of 800 r/min.

Key words: tucker, optical edge processing, oblique airflow, folding airflow, fluid-structure interaction