JPH0631328A - Method for controlling tension of carrying material in looper - Google Patents

Abstract

PURPOSE:To prevent the elongation and the breaking of a material by adjusting the speed control gain of a looper in response to a deviation of a speed command, mounting a tension detector on the inlet side and the outlet side of the looper and controlling the tension of the looper with an average output as a tension detecting signal. CONSTITUTION:This device is a controller of the looper 3 which is mounted between bridles 1, 2 on an inlet and outlet sides and accumulates a carrying material 5. It is a tension controller of carrying material 5 in the looper provided with a looper speed controller 22 to control the speed of a looper motor 20 in response to an adding signal including an output from a looper tension setting tool 25, an output in response to a deviation between outputs from looper tension detectors 8, 9, a deviation between speed commands from bridles 1, 2 on the inlet and outlet sides and a detection signal from a looper speed detector 23. A gain controller 27 is provided for adjusting the gain of this looper speed controller 23 in response to deviation of the speed command. In this way, a stable tension control can be carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material tension control device for a looper for conveying materials such as steel, paper and film.

[0002]

2. Description of the Related Art FIG. 2 is a diagram showing an embodiment of a conventional looper control. Reference numeral 1 is an entrance side bridle, 2 is an exit side bridle, 3 is a looper, 4 is a winding machine, 5 is a material to be conveyed (arrows indicate a conveying direction), 6 is an entrance speed command generator, and 7 is an exit speed command. Generator, 8 is an entrance side tension detector, 9 is an exit side tension detector, 10 is an entrance side bridle motor, 11 is an entrance side bridle drive device, 12 is an entrance side bridle speed controller, 13
Is an incoming bridle speed reducer, 14 is an incoming bridle speed detector, 15 is an outgoing bridle motor, 16 is an outgoing bridle drive device, 17 is an outgoing bridle speed controller, 18 is an outgoing bridle speed reducer, and 19 is an outgoing bridle speed reducer. Side bridle speed detector, 20 is a looper electric motor, 21 is a looper drive device, 22
Is a looper speed controller, 23 is a looper speed detector, and 24 is a looper tension controller. The incoming bridle 1 is speed-controlled according to the speed command from the incoming speed command generator 6. The same applies to the outgoing bridle 2. The tension of the looper 3 is controlled and the speed of the looper 3 is also controlled by a minor loop of the looper 3, and the speed command is given a deviation between the speed commands of the input side and the output side. The output of the looper tension controller 24 is also input to this speed loop. The looper 3 is installed between the inlet side where the processing cannot be interrupted, that is, the material transfer cannot be stopped, and the outlet side where the transfer must be stopped in order to exchange the product. In some cases, the entrance side and the exit side are opposite, that is, the exit side cannot be stopped. When the delivery side is stopped, the looper 3 accumulates the material while maintaining a predetermined tension, and waits for the processing on the delivery side. When the product is replaced, that is, the rolled-up product is discharged and the preparation for winding the next product is completed, the output side discharges the accumulated amount at a higher speed than the input side, and becomes the same speed as the input side at a predetermined position. At this point, the speed of the looper 3 becomes zero. That is, the tension control is performed in the stopped state.

[0003]

When the tension control is performed in the stopped state in the looper 3 described above, if the speed control gain during traveling is still maintained, a speed control output that should respond to a minute speed deviation is generated. Then, vibration occurs near the stop position. In particular, when the looper 3 is raised and lowered by a loose chain or a rope with a large elongation, the system may be disturbed and the material may be broken. Further, in the looper 3, when the tension control is performed by the detector only on the input side (or the output side),
The tension on the output side (or the input side) is not controlled and the looper 3
The mechanical loss of itself and a large number of non-driving rolls and the acceleration / deceleration torque due to their inertia cause the material to expand and contract and the looper to tilt. As described above, the conventional technique has a problem that the tension control of the conveyed material in the looper becomes unstable. An object of the tension control device of the present invention is to solve this problem and provide a device capable of performing stable tension control.

[0004]

SUMMARY OF THE INVENTION The present invention is a control device for a looper that is placed between an inlet side and an outlet side bridle for controlling the speed of a conveyed material and accumulates the conveyed material. Of the looper tension detector, the output according to the deviation from the output of the looper tension detector, the deviation of the speed command of the input and output bridles, and the addition / subtraction signal of the detection signal from the looper speed detector. In a tension control device for a conveyed material in a looper including a looper speed controller for controlling a speed of an electric motor, a gain adjuster for adjusting a gain of the looper speed controller according to a deviation of the speed command is provided. The output from the looper tension detector is the average value of the outputs from the looper entry side tension detector and the looper exit side tension detector.

[0005]

With the configuration described above, the speed control gain according to the speed command of the looper is determined, and the tension detection signals are averaged, whereby the tension control in the stopped state can be stably performed.
Further, the expansion and contraction of the material can be reduced.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. The same parts as those in FIG. 2 have the same reference numerals. The entrance-side bridle motor 10 is driven by the drive device 11 and drives the entrance-side bridle 1 via the speed reducer 13. The entrance-side bridle motor 10 is speed-controlled by the entrance-side bridle speed controller 12 according to a command from the entrance-side speed command generator 6. Similarly, the outlet bridle 2 includes an electric motor 15, a drive device 16, and a speed reducer 18.
The speed is controlled by the output side bridle speed controller 16 in accordance with the command from the output side speed command generator 7. The looper electric motor 20 is tension-controlled by the looper tension controller 24 by using the output of the averaging device 26 that outputs the average value of the outputs of the inlet tension detector 8 and the outlet tension detector 9 as a detection signal. Inside the tension control loop, the looper speed controller 2
There are two. The gain of the speed controller 22 is determined according to the speed command value (that is, the gain is lowered when the speed command value becomes small), and the gain adjuster 27 has a characteristic as shown in FIG. 1, for example. .

[0007]

As described above, according to the present invention, the speed control gain of the looper is determined according to the command, and the tension detectors are provided on the inlet side and the outlet side of the looper, and the averaged output thereof is used as the tension detection signal. By doing so, stable tension control is performed, and there is an effect of preventing elongation and breakage of the material.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a conventional looper control.

[Explanation of symbols]

 1 Input side bridle 2 Output side bridle 3 Looper 4 Winding machine 5 Conveying material 6 Input side speed command generator 7 Output side speed command generator 8 Input side tension detector 9 Output side tension detector 10 Input side bridle motor 11 Input Side bridle drive device 12 incoming bridle speed controller 13 incoming bridle speed reducer 14 incoming bridle speed detector 15 outgoing bridle motor 16 outgoing bridle drive device 17 outgoing bridle speed controller 18 outgoing bridle speed reducer 19 outgoing Side bridle speed detector 20 Looper motor 21 Looper drive device 22 Looper speed controller 23 Looper speed detector 24 Looper tension controller 25 Looper tension setter 26 Averaging device 27 Gain adjuster

Claims (3)

[Claims] 1. A looper control device for accumulating the material to be conveyed, which is placed between an inlet side and an outlet side bridle for controlling the speed of the material to be conveyed, the output from a looper tension setting device, and a looper tension detector. Looper speed control for controlling the speed of the looper motor in accordance with an addition / subtraction signal of the output according to the deviation from the output from the input / output side, the deviation of the speed command of the input / output bridle, and the detection signal from the looper speed detector. In a tension control device for a conveyed material in a looper, the tension of the conveyed material in a looper is provided with a gain adjuster for adjusting a gain of the looper speed controller according to a deviation of the speed command. Control device. 2. A looper control device for accumulating the conveyed material, which is placed between an inlet side and an outlet side bridle for controlling the speed of the conveyed material, the output from the looper tension setting device, and a looper tension detector. Looper speed control for controlling the speed of the looper motor in accordance with an addition / subtraction signal of the output according to the deviation from the output from the input / output side, the deviation of the speed command of the input / output bridle, and the detection signal from the looper speed detector. In a tension control device for a conveyed material in a looper including a looper, the output from the looper tension detector is an average value of the outputs from the looper entry side tension detector and the looper exit side tension detector. The tension control device for the conveyed material in the characteristic looper. 3. A looper control device for accumulating the conveyed material, which is placed between an inlet side and an outlet side bridle for controlling the speed of the conveyed material, the output from the looper tension setting device, and the looper inlet side tension. Addition / subtraction signal of the output according to the deviation from the average value of the output from the setter and looper output side tension detector, the deviation of the speed command of the input side and output side bridle, and the detection signal from the looper speed detector In the tension control device for the conveyed material in the looper, which comprises a looper speed controller for controlling the speed of the looper electric motor according to, the output from the looper tension setting device and the looper inlet side tension detector and the looper outlet side tension detector In a looper tension control device for a conveyed material in a looper, which comprises a looper speed controller for speed-controlling a looper electric motor according to a deviation from an average value of the output of the looper speed controller. A tension control device for a conveyed material in a looper, comprising a gain adjuster for adjusting a gain according to a deviation of the speed command.