转杯纺排杂区流场与排杂性能

Airflow Field in the Trash Removal Zone and Trash Removal Performance in Rotor Spinning

采用数值模拟的方法获得转杯纺排杂区气流场的特征,在此基础上分析纤维和杂质在流场中的运动,并研究纺纱参数对排杂性能的影响。研究结果表明:上主排杂区主要排除一些质量较大的杂质,微小杂质容易被回收;下主排杂区为强气流区,气流流动复杂,要避免杂质在此处排出;转杯出口压力和分梳辊转速对气流场影响甚微,但增大分梳辊转速有利于增大杂质离心惯性力,提高排杂力度;气流速度随吸杂口负压增大而增大,当吸杂口负压增加到-700Pa时,上主排杂区气流速度急剧上升,大大增加杂质回流的风险。

Analysis on fiber and trash movements in the airflow of the trash removal zone in rotor spinning is conducted based on the airflow field obtained by numerical simulation. Then the effects of the spinning parameters on trash removal performance are studied. The results show that most of the heavy trash are removed in the upper trash removal zone, while light trash can easily flow back to the roller chamber. The trash should be kept from removing from the lower trash removal zone because of the strong and complex airflow. Rotor outlet pressure and opening roller speed have little effect on the air velocity. However, a higher opening roller speed generates a larger centrifugal force on the trash which is helpful for trash removal. The air velocity increases with the increase of trash box pressure. A further increase to - 700 Pa leads to a sharp air velocity increase in the upper trash removal zone, increasing the possibility of trash flowing back to the opening roller.