细纱机导纱杆的安装改造

为探讨导纱杆在不同安装方式对粗纱退绕张力的影响，减少纺纱过程中粗纱退绕时产生的意外牵伸，分别改变导纱杆高低位置、导纱杆与粗纱的距离、导纱杆直径、导纱杆转动方式等因素，对粗纱退绕张力进行计算、分析，发现粗纱退绕张力也随之发生相应变化。经对比论证，得出有利于粗纱退绕的导纱杆安装方式：导纱杆位置宜设在距粗纱卷装下端1/3处，甚至可与粗纱卷装下端平齐；导纱杆与粗纱的距离尽可能大些；导纱杆直径在满足其支承粗纱退绕强力时越小越好；固定导纱杆改成转动式，可使粗纱与导纱杆的接触由曲面摩擦变为滚动摩擦。

Installation innovation of guide bar on spinning frame

In order to investigate the influence of yarn guide bar on unwinding tension of roving as a function of its installation so as to reduce the unexpected drafting on roving while unwinding and spinning, the roving unwinding tensions were tested when varying the guide bar installation parameters such as the height of installation position, the gap between guide bar and roving, guide bar diameter, types of rotation of the bar, etc. The results demonstrated that the parameters have remarkable influence on unwinding tensions of roving. The optimum guide bar installation parameters were obtained as follows: the height of installation position should be at 1/3 above the bottom of roving bobbin or flush with the bottom, the gap between guide bar and roving as large as possible, the guide bar diameter as fine as possible provided that it can bear the unwinding tension of roving, and transforming the guide bar from fixed type into rotating type makes the fraction between roving and guide bar change from curved surface friction to rolling friction.