TENSION CONTROLLING METHOD OF STRIP

摘要

PURPOSE:To elevate the accuracy in tension control and plate thickness accuracy as well by calculating the eccentric quantity of a coil diameter from both outputs of a coil diameter arithmetic device and non-contact type distance detector and by correcting the torque of a reel driving motor with the eccentric quantity thereof as a tension correcting value. CONSTITUTION:The non-contact type distance detector 9 which is oppositely arranged movably in the radial direction of a coil 2 thereto is subjected to the position control so that the deviation epsilon is made zero with comparing the coil diameter signal R(t) which a coil diameter calculating device 13 outputs with the position signal f(x) which a position detector 12 outputs. A coil eccentric quantity calculating device 14 stores the coil diameter detecting signal f(g) of the detector 9 and said signal R(t) in the prescribed times during one rotation of the coil 2, and calculates the coil eccentric quantity and inputs into a tension controlling device 19 the eccentric quantity thereof as a tension correcting value. The device 19 thus performs the tension control with high accuracy with correcting the torque of the driving motor 3 of a tension reel 1.