JPH05116823A - Tension control device for sheet-like material - Google Patents

Abstract

PURPOSE:To reduce a change in tension of a sheet-like material by controlling the speed of an electric motor in accordance with a specified equation on the basis of the sensed tension of the sheet-like material, the sensed position of a dancer roll, and the sensed speed of the electric motor. CONSTITUTION:The tension of a sheet-like material web 11 is sensed by a tension detector 32 and calculation is made of a deviation T thereof from a set value. The position of a dancer roll 21 is detected by a position detector 22 and calculation is made of a deviation x thereof from a set value and a speed x of the dancer roll. Further, the speed of an electric motor 19 is detected by a speed detector 33 and calculation is made of a deviation v thereof from a set value. On the basis of the calculated values, a speed correction quantity rs of the electric motor 19 is calculated from the equation ( t represents the control period, SIGMA T represents a value added to T for each cyclic control period, SIGMA Tv represents an added value for each cyclic control period, KPT, KPX, KPD, and KPV represent proportional gains of T, x, x, and v, and KIT and KIv represent integration gains of T, and v) thereby calculate the speed instruction value for the electric motor 19, thus controlling the speed thereof and thereby maintain the tension of the web 11 to be fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-shaped material tension control device which can be used in a sheet-shaped material processing facility.

[0002]

2. Description of the Related Art FIG. 4 schematically shows a conventional processing equipment having a tension control device for a sheet material.

A facility for processing a sheet-like material (hereinafter referred to as a web) such as a film or paper which is continuous in the transport direction is composed of a plurality of transport rolls and an electric motor. That is, as shown in FIG. 4, the web processing facility has an unwinding roll 12 for rewinding the web 11,
Delivery rolls 13, 1 for transporting the web 11 to the processing section
4, 15, a winding roll 16 for winding the web 11, and an electric motor 17 for driving the rolls 13, 14, 15, 16.
18, 19, and 20 are provided.

Further, in the web processing equipment,
If the tension of the web 11 fluctuates, the steel sheet undergoes a dimensional change or meandering, and the film has wrinkles, which leads to a deterioration in product quality. Therefore, such a processing facility is provided with a tension control device for keeping the tension of the web 11 constant.

That is, each roll 12, 13, 14, 15,
A dancer roll 21 is provided to control the tension T of the web 11 between the rolls 16. This is because the position of the dancer roll 21 and the inter-roll tension T are normally in a proportional relationship, and therefore the tension T of the web 11 is controlled by keeping the position of the dancer roll 21 constant.

As a method for keeping the position of the dancer roll 21 constant, for example, the position of the dancer roll 21 is detected by the position detector 22, and the detection result is detected by the PI controller 23.
And output the speed correction amount of the electric motor 19 to the following formula 2
A method of making a decision by the method is conventionally known.

[0007]

[Equation 2]

[0008]

In the above-mentioned conventional tension control device for sheet-like materials, the web 11 is accelerated,
Alternatively, transient tension fluctuations caused by differences in responsiveness of the electric motors 18 and 19 when decelerating and differences in moments of inertia of the delivery rolls 14 and 15, and the delivery rolls 14 and 1
There is a problem that it is not possible to cope with the high frequency fluctuation of the tension caused by the eccentricity of No. 5, and it is difficult to keep the tension T of the web 11 at a predetermined value.

The present invention is intended to solve such problems, and an object of the present invention is to provide a tension control device for a sheet-shaped material, in which fluctuations in the tension of the sheet-shaped material are reduced to improve the quality. ..

[0010]

A tension control device for a sheet-shaped material according to the present invention for achieving the above object comprises a conveyor roll for conveying a continuous sheet-like material, and an electric motor for driving the conveyor roll. In a tension control device for a sheet material having a dancer roll for absorbing tension fluctuations of the sheet material, a tension detector for detecting the tension of the sheet material, and a detected value of the detected tension. A subtracter that calculates the deviation from the set value, a position detector that detects the position of the dancer roll, a subtractor that calculates the deviation from the set value based on the detected value of the detected dancer roll, and the dancer roll A differentiator for calculating the speed, a speed detector for detecting the speed of the electric motor, a subtractor for calculating a deviation from a set value based on the detected value of the detected speed of the electric motor, and the arithmetic unit A calculator for calculating from the following equation 3 the speed correction amount of the motor from the calculated values were, is characterized in that comprises a calculator for calculating a speed command value from the calculated speed correction amount.

[0011]

[Equation 3]

[0012]

[Function] The tension detector detects the tension of the sheet material and calculates the deviation from the set value, and the position detector detects the position of the dancer roll to detect the deviation from the set value and the speed of the dancer roll. The speed detector detects the speed of the electric motor and calculates the deviation from the set value. Then, based on each calculated value, the speed correction amount of the electric motor is calculated by a predetermined mathematical expression to calculate the speed command value of the electric motor, and the tension of the sheet material is kept constant by drivingly controlling the speed of the electric motor. Kept in.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a schematic view of a processing equipment having a sheet material tension control device according to an embodiment of the present invention, FIG. 2 is a control block of the sheet material tension control device, and FIG. 3 is a tension fluctuation amount. The graph which shows change is shown. The members having the same functions as the conventional ones are designated by the same reference numerals, and the duplicated description will be omitted.

As shown in FIG. 1, in the web processing equipment of this embodiment, the unwinding roll 12 of the web 11 and the respective feeding rolls 13, 14, 15 and the winding roll 16 and the respective rolls 1 are provided.
Electric motors 17, 18, 1 for driving 3, 14, 15, 16
It is equipped with 9, 20. Then, the delivery rolls 14 and 15
A dancer roll 21 for controlling the tension T of the web 11 is arranged between them. Furthermore, this dancer roll 21
A position detector 22 for detecting the position is disposed adjacent to the position detector 22. The output result of the position detector 22 is used as a tension controller 31
The speed control amount of the electric motor 19 can be calculated by the tension control device 31.
Further, 32 is a tension detector for detecting the tension of the web 11,
33 is a speed detector for detecting the speed of the electric motor 19,
Each of the detection results can be output to the tension control device 31.

Here, the control method by the tension control device for the sheet-shaped material of this embodiment will be described with reference to the control block diagram of FIG. First, the position of the dancer roll 21 is detected by the position detector 22, and the detection result is subtracted by the subtractor 3
5 and outputs the calculated deviation to the calculator 38 based on the calculation result from the preset value representing the preset position of the dancer roll 21. Further, the detected value of the position of the dancer roll 21 is output to the differentiator 36, where the speed of the dancer roll is calculated and output to the calculator 38.

At the same time, the tension of the web 11 is detected by the tension detector 32, the detection result is output to the subtractor 34, and the web 1 previously input based on the calculation result is output.
The deviation from the tension set value of 1 is calculated and output to the calculator 38. Then, the speed of the electric motor 19 is detected by the speed detector 33, the detection result is output to the subtractor 37, the deviation from the speed setting value input in advance is calculated based on the calculation result, and the deviation is output to the calculator 38. To do.

Next, the calculator 38 calculates the speed correction amount of the electric motor 19 from the input detection results by the following equation (4). However, the speed correction amount of the electric motor 19 is Δr _S , the web 1
The deviation of the tension of 1 from the set value is ΔT, Δ for each control cycle
The added value of T is ΣΔT, the deviation from the set value of the dancer roll 21 is Δx, the speed of the dancer roll 21 is dx / dt, the deviation from the set value of the speed of the electric motor 19 is Δv, and the added value for each control cycle is ΣΔv. , The control cycle is Δt, the proportional gain of ΔT is K _PT , the integral gain of ΔT is K _It , the proportional gain of Δx is K _Px , the proportional gain of d / dtx is K _PD , and the proportional gain of Δv is K _Pv , Δv _{Let the} integral gain be K _Iv .

[0019]

[Equation 4]

The gains K _PT , K _It , K _Px , K _PD ,
K _Pv and K _Iv are obtained by, for example, creating a mathematical model of the processing equipment shown in FIG. 1 and applying an optimum regulator control law. In addition, in the present specification, the speed of the dancer roll 21 is expressed by the following mathematical formula 5.

[0021]

[Equation 5]

Thereafter, the speed correction amount of the electric motor 19 calculated by the above-mentioned formula 4 is output to the adder 39, and the speed command value is calculated by adding this speed correction amount to the line speed set value.

As shown in FIG. 3, the tension fluctuation amount of the web 11 in the present embodiment shown by B in the figure is A in the figure.
It can be seen that the tension fluctuation amount is reduced as compared with the conventional tension fluctuation amount.

[0024]

As described above in detail with reference to the embodiments, according to the tension control device for a sheet-shaped member of the present invention, the tension of the sheet-shaped material is detected by the tension detector and the deviation from the set value is detected. In addition to calculating, the position detector detects the position of the dancer roll to calculate the deviation from the set value and the speed of the dancer roll, and the speed detector detects the speed of the motor to calculate the deviation from the set value. By calculating the speed correction amount of the electric motor by a predetermined mathematical expression based on each calculated value and calculating the speed command value, the speed of the electric motor for driving the roll is drive-controlled. The tension of the sheet-shaped material can be kept constant, the fluctuation of the tension of the sheet-shaped material can be reduced, and the quality can be improved.

[Brief description of drawings]

FIG. 1 is a schematic view of a processing apparatus having a tension control device for a sheet-shaped material according to an embodiment of the present invention.

FIG. 2 is a block diagram of a tension control device for a sheet-shaped material.

FIG. 3 is a graph showing changes in tension fluctuation amount.

FIG. 4 is a schematic view of a processing apparatus having a conventional sheet material tension control device.

[Explanation of symbols]

 11 Web (sheet-shaped material) 13, 14, 15 Conveying rolls 17, 18, 19 Electric motor 21 Dancer roller 22 Position detector 31 Tension control device 32 Tension detector 33 Speed detector 34, 36, 37 Subtractor 35 Differentiator 38 Calculation Vessel 39 adder

Claims (1)

[Claims] 1. A tension control device for a sheet material, comprising: a conveyance roll that conveys a continuous sheet material; an electric motor that drives the conveyance roll; and a dancer roll that absorbs a tension fluctuation of the sheet material. In, a tension detector that detects the tension of the sheet-shaped material, a subtractor that calculates a deviation from a set value based on the detected value of the detected tension, and a position detector that detects the position of the dancer roll. ,
A subtractor that calculates the deviation from the set value based on the detected value of the dancer roll and a differentiator that calculates the speed of the dancer roll, a speed detector that detects the speed of the electric motor, and a detected electric motor A subtracter that calculates the deviation from the set value based on the detected value of the speed, a calculator that calculates the speed correction amount of the electric motor from the calculated calculation values by the following formula 1, and a calculated speed correction amount A tension control device for a sheet-shaped material, comprising: a calculator for calculating a speed command value from the. [Equation 1]