JPH0576918A - Tension control system of device for transporting steel sheet - Google Patents

Abstract

PURPOSE:To provide a tension control system of device for transporting a steel sheet with which tension can be automatically corrected during operation. CONSTITUTION:When the speed of speed adjusting roll is constant and a wrong set value 6 of tension is set, the set value 6 of tension is automatically corrected by calculating the value of tension to be corrected from the change of current value 18 that is applied to a motor 12 for speed adjusting roll and adding this value of tension to be corrected to the set value 6 of tension.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension control system for a thin steel plate transporting device for transporting thin steel plates in a continuous hot zone.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a conventional thin sheet steel sheet conveying device, 1 is a thin sheet steel sheet, 2 is a payoff reel (tension adjusting roll) for unwinding the steel sheet sheet 1, 3 is a fixed roll,
4 is a bridle roll (speed adjusting roll), which is the main zone speed, and 5 is a loop car (tension adjusting roll).

Generally, in zone control of a sheet steel sheet conveying apparatus for conveying sheet steel sheets in such a continuous hot zone, the payoff reel 2 and the loop car 5 move the sheet steel sheet 1 to the payoff reel 2 according to a tension set value. The tension is controlled by the current applied to the loop car 5, and the bridle roll 4 controls the speed of the thin steel plate 1. The tension set value is the material, the thickness of the thin steel plate 1,
It is calculated and obtained from the unit tension of the plate width.

FIG. 3 is a block diagram showing a tension control system of a conventional sheet steel sheet conveying apparatus. In the figure, 6 is a tension set value given to the payoff reel 2 and the loop car 5 as described above, and 7 is a loss of these machines. A loss setting value set assuming minutes, and 8 is an adder for adding the tension setting value 6 and the loss setting value 7. 9 is the correction value during acceleration or deceleration,
10 is an adder for adding the correction value 9 to the output of the adder 1, 1
1 is the final tension setting value.

Next, the operation will be described. In the thin steel plate conveying apparatus as shown in FIG. 2, the speed control and the tension control by changing the plate thickness of the thin steel plate 1 are performed. During speed control, the speed of the bridle roll 4 changes in response to a change in the speed set value of a speed control system (not shown). Since the payoff reel 2 and the loop car 5 are tension controlled by the current according to the tension set value 6, the current is controlled to be constant irrespective of each speed. When the speed set value is changed, the speeds of the pay-off reel 2, bridle roll 4, and loop car 5 do not match, but gradually match. This is because the FBK of the tension of the payoff reel 2 and the loop car 5 becomes stable, and the slack and tension of the thin steel plate 1 between the payoff reel 2, the bridle roll 4, and the loop car 5 disappears.

At the time of controlling the tension by changing the material, the thickness and the width of the thin steel plate 1, as shown in FIG. 3, the tension settings such as the tension setting value 6, the loss setting value 7 and the correction value 9 of the tension control system are set. The current applied to the pay-off reel 2 and the loop car 5 is changed to control the tension of the thin steel plate 1. Since the bridle roll 4 is speed-controlled, there is no particular change. During tension control, if the tension is not set according to the change of the plate thickness, the thin steel plate 1 between the payoff reel 2, the bridle roll 4, and the loop car 5 sags, is overtightened, or the bridle roll 4 slips.

[0007]

Since the conventional tension control system for the thin sheet steel sheet conveying apparatus is configured as described above, the initial tension setting value 6 and the loss setting value 7 for the loss of the machine are set for the tension setting. When a disturbance that cannot be corrected by the correction value 9 at the time of acceleration or deceleration occurs, or due to an error in the material, thickness, or width of the thin steel sheet 1, the tension setting value 6 and the loss setting value are set. If the value 7 is set incorrectly, it is necessary to manually correct each setting value.
If each setting value was set incorrectly, there was a problem that the motor might trip.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a tension control system for a thin sheet steel sheet conveying device capable of automatically adjusting the tension during operation.

[0009]

A tension control system for a thin steel plate conveying apparatus according to the present invention provides a current applied to a motor of a speed adjusting roll when the speed adjusting roll has a constant speed and a tension set value is erroneously set. The tension setting value is automatically corrected by calculating the tension value to be corrected from the change in the value and adding the tension value to be corrected to the tension setting value.

[0010]

The tension control system for the thin sheet steel sheet conveying device according to the present invention determines whether the speed adjusting roll has a constant speed from the speed feedback signal from the motor of the speed adjusting roll. From the change in the current feedback signal of the motor of the speed adjustment roll caused by the error of the tension setting value given to
The tension value to be corrected is calculated, and the tension value to be corrected is added to the tension setting value to correct the tension setting value.

[0011]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. Note that the thin plate steel sheet conveying device shown in FIG. 2 is the same as that of the conventional technique, and therefore the description of the overlapping configuration is omitted.

FIG. 1 is a block diagram showing a tension control system of a thin steel plate conveying apparatus according to an embodiment of the present invention.
In the figure, 12 is the motor of the bridle roll (speed adjusting roll) 4 which is the main speed control, and 13 is the motor 1.
2 speed feedback signal. Reference numeral 14 is a differentiator for differentiating the speed feedback signal, and 15 is a differentiated speed feedback signal and a preset comparison value 16
And a comparator 17 for judging whether or not the motor 12 of the bridle roll 4 has a constant speed. Reference numeral 17 denotes a contact 19 when a signal from the comparator 15 that the motor 12 has a constant speed is received.
Is a reversing device that brings the.

18 is a motor 12 of the bridle roll 4
The current feedback signal 19 is a contact point where the motor 12 of the bridle roll 4 becomes conductive when the speed is constant as described above. 20 is a proportional integrator, 21 is a proportional integrator 2
The signal converted by 0 has a conversion gain of current and tension of 2
A multiplier for multiplying by 2, 6 is a tension set value given to the payoff reel (tension adjusting roll) 2 and the loop car (tension adjusting roll) 5 similar to the prior art, and 23 is a tension set value 6 and a signal from the multiplier 21. An adder 24 for adding is a final tension set value.

Next, the operation will be described. In the thin steel plate conveying device shown in FIG. 2, the material, the thickness of the thin steel plate 1,
Payoff reel 2 and loop car 5 due to incorrect board width
If the tension set value 6 applied to the bridle roll 4 is wrong, a large load is required for the bridle roll 4 only for speed control to obtain the speed as set, and the current value of the motor 12 of the bridle roll 4 changes greatly. Therefore, when the speed is constant, the tension value to be corrected of the thin steel plate 1 is calculated from the current feedback signal 18 of the motor 12, and the tension value to be corrected is added to the tension set value 6, whereby the pay-off reel 2 and the loop car are The tension settings given in 5 are automatically modified to obtain the optimum tension.

Further, from FIGS. 1 and 2, the operation will be described in more detail by taking as an example the case where the tension setting value 6 is too low when the speed is constant. In FIG. 2, if the tension setting value 6 is lowered too much, the thin steel plate 1 becomes thick and the thin steel plate 1 sags. Since the speed of the bridle roll 4 is kept constant under this condition, the current applied to the motor 12 of the bridle roll 4 increases. In the tension control system of FIG. 1, in this case, the speed feedback signal 13 of the motor 12 of the bridle roll 4 which is a constant speed condition is differentiated by the differentiator 14,
By comparing the differentiated speed feedback signal and the predetermined comparison value 16 by the comparator 15, it is determined that the speed is constant, and the contact 19 is brought into a conductive state via the inverter 17.

The current feedback signal 18, which is increased by the increased current applied to the motor 12 of the bridle roll 4, is proportionally integrated by the proportional integrator 20 via the contact 19, and the current and tension are added to the proportionally integrated signal. The conversion gain 22 is multiplied by the multiplier 21. This multiplier 2
The tension value after 1 is the tension setting value 6 initially set and the adder 23.
Therefore, the final tension setting value 24 having a value larger than the initial tension setting value 6 is given to the payoff reel 2 and the loop car 5. In this way, the tension setting value 6 which is too low at the beginning is corrected. When the initial tension set value 6 is excessively increased, the tension value after the multiplier 21 has a negative value, so the tension value is corrected to be smaller than the initial tension set value 6.

In the first embodiment described above, the thin steel plate conveying apparatus is described, but the same effect can be obtained also in the paper manufacturing apparatus if the above tension control system is used.

[0018]

As described above, according to the present invention, the tension control system of the thin steel plate conveying device is configured to use the motor of the speed adjusting roll when the speed adjusting roll has a constant speed and the tension set value is erroneously set. Since the tension value to be corrected is calculated from the change in the applied current value and the tension setting value is added to the tension setting value, the tension setting value can be automatically corrected. When changing the material, thickness and width of thin steel plate, even if the tension setting value is set incorrectly, there is no need to manually adjust the tension setting value, and the motor will not trip. It is effective.

[Brief description of drawings]

FIG. 1 is a block diagram showing a tension control system of a thin steel plate conveying apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional thin steel plate conveying device.

FIG. 3 is a block diagram showing a tension control system of a conventional thin steel plate conveying device.

[Explanation of symbols]

 1 Thin steel plate 2 Payoff reel (tension adjusting roll) 4 Bridle roll (speed adjusting roll) 5 Loop car (tension adjusting roll) 6 Tension set value 12 Motor

Claims (1)

[Claims] 1. A thin steel plate is conveyed in a continuous hot zone and is provided with a tension adjusting roll for controlling the tension of the thin steel plate and a speed adjusting roll for speed control of the thin steel plate. In the tension control system of the thin plate steel sheet conveying device that changes the tension set value given to the tension adjustment roll when changing the thickness and the plate width, in the tension control system of the thin plate steel sheet conveying device, the speed adjustment roll has a constant speed, and When the tension setting value is set incorrectly, the tension value to be corrected is calculated from the change in the current value applied to the motor of the speed adjusting roll, and the tension value to be corrected is added to the tension setting value. A tension control system for a thin sheet steel sheet conveying device, which automatically corrects the tension set value.