JPH0826550A - Outlet side looper tension control method - Google Patents

Abstract

PURPOSE:To prevent a slip between an outlet side bridle and strip by controlling outlet side looper tension. CONSTITUTION:In a tension control method for an outlet side looper 2 in a process line providing the outlet side looper 2 and, before and after thereof, respectively the first/second bridle rolls 1, 3, so as to wind a metal band, passing through the second bridle roll 3, to winder 5 through a deflector roll 4, a speed detector 21 of an outlet side roll 3b of the second bridle roll and a speed detector 22 of the deflector roll 4 just before the winder 5 are provided. Further based on a difference signal between respective detection signals of the speed detectors 21, 22, a tension preset value of the outlet side looper is corrected. The difference signal between the respective detection signals of the speed detectors 21, 22 is input to a function generator 23, and by adding a product of this output signal and the looper tension preset value to the looper tension preset value, it is compensated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the tension of a delivery looper in a steel process line having a delivery looper and bridle rolls in front of and behind it.

[0002]

2. Description of the Related Art In the conventional tension control of an exit looper, a looper tension set value is corrected by mechanical loss compensation and inertia compensation as shown in FIG. 2, but slippage between the exit bridle roll and a metal strip is corrected. Was not taken into account. In the figure, 1 is a center side bridle roll provided at the center of the process line, 2 is an exit side looper, 3 is an exit side bridle roll, 4 is a deflector roll, and 5 is a winder.
6 and 7 are electric motors for driving the central bridle roll 1.
11 is the control device, 8 is an electric motor that drives the exit looper,
12 is the same control device, 9 and 10 are exit side bridle rolls 3.
Is a motor, and 13 is the same control device. Also, 1
Reference numeral 4 is a tension setting device for the exit looper 2, 15 is a center speed command device, 16 is a exit speed command device, and 17 is a mechanical loss compensator and an inertia compensator. Next, the operation will be described. Control device 11
Controls the central bridle roll electric motors 6 and 7 in accordance with the central speed command value Vc generated by the central speed command device 15, and the control device 12 controls the looper electric motor 8 in accordance with the looper tension command T _LP. Reference numeral 13 controls the outgoing bridle roll drive motors 9 and 10 according to the outgoing speed command Vd generated by the outgoing speed commander 16.
Here, the looper tension command T _LP is the central speed command value V
c, the output side speed command Vd, the central acceleration / deceleration dVc / dt, and the mechanical loss compensation and inertia compensation calculated based on the output side acceleration / deceleration dVd / dt, and the looper tension setting T _LP1 .

[0003]

However, in the conventional looper tension control method, when the winding tension of the winder and the output side looper tension are extremely unbalanced, the output side bridle roll is set to the output side tension. The torque corresponding to the difference in the tension on the exit side looper could not be generated, and slip occurred between the strip and the bridle roll on the exit side, which adversely affected the quality of the wound metal strip. Therefore, an object of the present invention is to prevent slipping between the outlet bridle and the strip by controlling the outlet looper tension.

[0004]

In order to solve the above-mentioned problems, the present invention provides a delivery looper and first and second bridle rolls before and after the exit looper, respectively, and a metal passing through the second bridle roll. In the tension control method for the exit side looper in a process line in which a strip is wound around a winder via a deflector roll, a speed detector 21 for the exit side roll 3b of the second bridle roll, and the winder. And the speed detector 22 of the deflector roll 4 immediately before are provided, and the tension set value of the exit side looper is corrected based on the signal of the difference between the detection signals of the speed detectors 21 and 22. Further, in the method of correcting the tension of the outgoing looper based on the difference signal between the detection signals of the speed detectors 21 and 22, the difference signal is input to the function generator 23, and the output signal and the looper tension are inputted. There is a method of correcting the looper tension set value by adding the product of the set value and the looper tension set value.

[0005]

By the above means, slipping between the outlet bridle and the strip can be prevented, so that the quality of the metal strip can be improved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram for explaining the principle of the present invention. The same parts as those in FIG. 2 are designated by the same reference numerals. Hereinafter, parts different from FIG. 2 will be described. Reference numeral 21 designates a delivery side roller 3b driving motor 1 of the delivery side bridle roll 3.
0 is a velocity detector, 22 is a velocity detector attached to the deflector roll 4, 23 is a function generator, and 24 is a function generator.
Is a subtractor, 25 is a multiplier, and 26 is an adder. Here, the looper tension command T _LP is mechanical loss compensation and inertia compensation calculated by the central speed command value Vc, the output speed command Vd, the central acceleration / deceleration dVc / dt, and the output acceleration / deceleration dVd / dt, and the looper tension setting. T _LP1 and slip correction T _LP δ
Given as the sum of. This slip correction amount T _LP δ is given by the following method. Speed signal Vd ₁ of the outgoing bridle roll detected by the speed detector 21 attached to the motor 10 that drives the outgoing roll 3b of the outgoing bridle roll 3, and the speed signal of the metal strip detected by the deflector roll 4. The difference from Vd ₂ is calculated by the subtractor 24, and this difference signal S _LP is input to the function generator 23. The function generator 23 may be, for example, a linear function having a dead zone region in the center and having upper and lower limit values. The function generator calculates a correction coefficient δ according to the difference signal S _LP . Further, the multiplier 25 calculates the product of the correction coefficient δ and the looper tension set value T _LP1 to calculate the slip correction amount T _LP δ of the looper tension corresponding to S _LP . Adder 2
By adding the slip correction amount T _LP δ to the looper tension setting value T _LP1 by 6, the winding tension is higher than the exit side looper tension and the exit side bridle roll speed is slower than the metal strip speed (S _LP > 0). ), The looper tension setting value T _LP1
Is corrected in the increasing direction by the slip correction amount T _LP δ, and the difference between the winding tension and the exit side looper tension is reduced. When the take-up tension is lower than the exit looper tension and the exit bridle roll speed is faster than the metal strip speed (S _LP <0), the looper tension setting value T _LP1 is reduced by the slip correction amount T _LP δ. The difference between the winding tension and the tension on the exit side looper is reduced. That is, even if the roll 3b of the exit side bridle roll 3 causes a slip, it is possible to suppress the continuation of the slip by performing such a correction.

[0007]

As described above, according to the present invention, even if slip occurs between the exit side bridle roll and the metal strip, the difference between the exit side looper tension and the winding tension can be reduced. Since it is possible to prevent the slip between the exit side bridle roll and the metal band from continuing, it is possible to stabilize the transfer of the metal band in the process line and improve the quality of the product wound on the winder.

[Brief description of drawings]

FIG. 1 is an embodiment of an exit looper tension control method according to the present invention.

FIG. 2 is an example of an exit looper tension control method according to a conventional technique.

[Explanation of symbols]

 1 central bridle roll 2 exit side looper 3 exit side bridle roll 4 deflector roll 5 winder 6, 7 central bridle roll drive motor 8 exit side looper drive motor 9, 10 exit side bridle roll drive motor 11, 12, 13 control device 14 Looper tension setting device 15 Central speed command device 16 Outgoing speed command device 17 Mechanical loss compensation and inertia compensator 21 Outgoing bridle roll speed sensor for outgoing roll 22 Deflector roll speed detector 23 Function generator

Claims (2)

[Claims] 1. An exit looper and first and second front and rear parts, respectively.
A second bridle roll is provided, and in the tension control method of the exit side looper in the process line where the metal band that has passed through the second bridle roll is wound around the winder through the deflector roll, the second A speed detector 21 of the exit roll 3b of the bridle roll and a speed detector 22 of the deflector roll 4 immediately before the winder are provided, and based on the difference signal between the detection signals of the speed detectors 21 and 22. A method for controlling tension on the outgoing looper, which comprises correcting the tension set value of the outgoing looper. 2. An exit looper and first and second front and rear parts, respectively.
A second bridle roll is provided, and in the tension control method of the exit side looper in the process line where the metal band that has passed through the second bridle roll is wound around the winder through the deflector roll, the second A speed detector 21 of the exit roll 3b of the bridle roll and a speed detector 22 of the deflector roll 4 immediately before the winder are provided, and the difference signal between the detection signals of the speed detectors 21 and 22 is used as a function. A looper tension control method on the output side, characterized in that the looper tension set value is compensated by adding the product of the output signal of the generator 23 and the looper tension set value to the looper tension set value.