¡¡¡¡Automatic constant tension
(ACT) bobbin hanger is designed and developed by our
factory under a large analysis of structures of bobbin
hangers from both at home and abroad. And also we
made in-depth investigation from problems in using
bobbin hanger in domestic spinning mills. By years'
of research, we developed out this ACT bobbin hanger.
Thus we solved the problems of unstable tension, unexpected
prolonged and suspended roving yarns during unwinding,
which would cause yarn defects, hard heads and yarn
breakages, etc.
¡¡¡¡ACT bobbin hanger changes its original structure
mode, the constant tension structure (internal) is
comprised of damping spring, force spring, and steel
ball bowl. Its working principle is the turning friction
of bobbin hanger changes with the weight of roving.
The stable tension of roving from heavier to lighter
during unwinding is ensured by controlling the damping
value of friction which is completed by elastic ratio
of damping spring, force spring and friction ratio
of damping cap.
¡¡¡¡Specific working principle descriptions: when bobbin
hanger with full roving, its gravity is maximum, at
this time the force spring is under maximum pressure,
leading damping cover moves down, at this same time
the compressed damping spring would be released and
elongated, and the pressure of damping spring on damping
cover would be reduced (maximum designed pressure
at ex-works), so the friction is minimum, full roving
tension is fixed. As roving becoming smaller and smaller,
gravity on bobbin hanger would also become smaller
and smaller, and unwinding speed would become faster.
At this time the force spring gradually releases and
elongates, and the damping spring is gradually compressed
and elasticity is strengthening. Pressure on damping
cover is also gradually becoming bigger, friction
is also becoming bigger, but the combined forces of
gravity and friction on roving do not change. The
roving tension keeps same as before. That is this
ACT bobbin hanger could keep the roving tension stable
by automatically adjusting unwinding friction ensuring
the roving tension remain unchanged, making unwinding
speed stable. Thus to avoid the roving speed unstable,
which would cause intermittently stops and appears
roving suspended, yarn defects, hard heads, and breakages,
etc. So, the problems, which had suffered spinning
mills for so many years, have been solved from now
on.
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