JPS5831848A - Constant tension controller of rewinding machine - Google Patents

Abstract

PURPOSE:To simplify constitution of a device and prevent a belt material from being damaged, by constituting the device such that in a slitter line and the like, a relating quantity of reel diameter in a winding machine is detected, on the basis of the detection, a tension control value for fixing tension of the rewinding machine is calculated, in this way, the rewinding machine is controlled by applying a brake. CONSTITUTION:A field winding current If of an electric motor 5 for a winding machine 2 is detected by a detector 7 and input to a control unit 8, while a setting output To of a tension setter 9 is input to the control unit. The control unit 8 performs arithmetic operation by this field current If and the setting tension To on the basis of a prescribed calculation formula, to output a compressed air pressure control signal to an electric-pneumatic converter 6. In this way, an air brake 4 applies a brake to a rotary drum of a rewinding machine 1 with prescribed brake torque to give constant tension to a belt-shaped material S between the rewinding machine 1 and the winding machine 2. In this constitution, the constant tension can be obtained with simple constitution without causing the damage of the belt material S.

Description

[Detailed Description of the Invention] This invention is applicable to a system that has a winder and an unwinder, and a strip material of the unwinder is wound up by the winder, such as a slitter line or a small rolling line. , relates to a control device that always keeps the tension of a strip material constant.

In systems of this type, it is very important to maintain constant tension in the strip. For example, in a rolling line, there is a problem such as tension shifting during rolling operation. Therefore, in the past, a detector for the unwinding tension was provided next to the unwinding machine for the strip material, and the braking force of the unwinding machine was controlled based on the detected tension. The tension detector consists of three rolls that meander through the unwound strip and a pressure detector that detects the force applied to the central roll of these rolls.This tension detector is inexpensive to install. In addition, since the roll is in direct contact with the strip material, there is a risk that scraps of the strip material may stick to the roll and this may damage the strip material. In order to prevent this, it is necessary to periodically inspect the rolls for scratches and adhesion of dregs to the rolls.

In addition, a touch roll is brought into contact with the strip material being wound around the unwinding machine, and the amount of unwinding is detected based on the amount of displacement of the touch roll. Based on this detection, the braking force of the unwinding machine is Some control the. This method has the advantage of being relatively inexpensive, but has the disadvantage that the touch roll cannot be used depending on the type of strip material, and the touch roll comes into direct contact with the strip material. I have the same problem as above.

The present invention provides a constant tension control device for an unwinding machine, which has a simple configuration and can be provided at low cost, and which can be applied to all kinds of strip materials, and which does not cause damage to the strip materials and does not require periodic maintenance inspections. The purpose is to provide.

Hereinafter, embodiments in which the present invention is applied to a rolling line will be described in detail with reference to the drawings.

In FIG. 1, the unwinding machine (11, the rolling mill (3) and the winding machine (2) are arranged in a straight line.
) and the winder (2) are both equipped with rotating drums, and the strip material (s) wound around the drum of the unwinder (1) is
), rolling m (passing through 31 to the winding I7!A (2) and winding up by the rotation of the drum. Winding machine (2
) is rotationally driven by a DC shunt electric motor II (51) controlled by a stationary Leonard system, and is controlled so that the winding speed and tension (T2) are constant.

The rewinding machine (1) is equipped with an air brake (4) as a brake, and this brake (4) causes the unwinding machine (
Braking force is applied to the drum in 1). Air brake (
The braking force of 4) is controlled by a controller (8). The controller (8) receives a detection signal from a field current detector (7) that detects the field current (If) flowing through the field winding (5a) of the electric motor [51], and a detection signal from the tension setting device (9). Setting output is input. The output of the controller (8) is sent to an electro-pneumatic converter (6), and the air brake (4) is operated by the compressed air output from this converter (6). The electro-pneumatic converter (6) has a built-in solenoid valve that is controlled by, for example, an output signal from the controller (8), and the amount or pressure of compressed air sent to the converter (6) is controlled by this solenoid valve. be adjusted.

- Now, in the unwinding m In order to apply tension (T1) to S), it is necessary to apply a braking torque (T1) given by the following equation to the rewinding machine (1).

τ1=T1・R1...(1) In order to keep the tension (T1) constant, the braking torque (T
1) should be increased or decreased in proportion to the rewinding diameter (R1)).

In the winding machine (2), when the electric motor (5) is controlled by the stationary Leonard method so that the winding speed and the tension (T2) applied to the strip material (S) are constant, the electric motor (5)
) is proportional to the radius (R2) of the strip material wound around the drum of the winder (2) (this is called the winding diameter).

IfωR2...(2) As the winding machine (1) progresses in winding the strip material (S), the winding diameter (R2) increases and the winding diameter (R1) decreases. The rewinding diameter [R2] and the rewinding diameter (R1) have a similar inversely proportional relationship.

Therefore, with (TO) as the required tension setting value and (6) as a constant, rl a: TO(1-KeIf) ---+3
By controlling the braking torque (τ1) of the unwinding machine (1) so as to satisfy the relationship (1), the tension (T1) on the unwinding m+11 side is always kept substantially constant.

The controller (8) performs the calculation of equation (3). The field current detected by the field current detector (7)
If) is amplified by the amplifier αD and becomes K1·If.

The required tension (TO) is set by the tension setting device (9), and this tension (To) is amplified by the amplifier O2.
It becomes K2・To. The multiplier 031 includes both amplifiers α1)1
It multiplies the output of 2, and the output is 1. and 2.T.
O・If. The subtractor type subtracts the output of multiplier 03 from the output of amplifier α2, and the result of the subtraction is 2・To(1−Kl If), which corresponds to the right side of equation (3). . The output of this subtractor αa is the electropneumatic converter (
6), the air brake n1 compressed air pressure is controlled, so the braking torque of the air brake (4) is the value (
T1).

As the strip material (S) is wound and unwound, the field current (If), unwinding diameter (R1), winding diameter (R2), and braking torque (T1) change as shown in Fig. 3. Change.

In this embodiment, it is sufficient to provide only the field current detector (7) as a detector, and there is no need for expensive and large-scale equipment as in the past, so it can be provided at low cost and compact. be able to. Also, the tension setting device (9
), for example, a variable resistor can be used, and from this point of view as well, the configuration becomes simple. And the tension (To
) can be set arbitrarily using just a knob operation, making operation and adjustment easy.

In the above embodiment, equation (3) is employed to control the braking torque (T1), but this can also be done using the following equation, for example.

fl CCK, TO/If ---+4) In this way, various calculation formulas for braking torque control can be considered. Moreover, the detector for the amount related to the winding diameter (R2) is not limited to a field current detector. For example, winder (2)
Since the integrated value of the amount of rotation of the drum is also approximately proportional to the take-up diameter (R2), this integrated value can also be employed. Also,
The touch roll is kept in constant contact with the strip material being wound around the winder (2), and the amount of displacement of the touch roll is -
It is also possible to detect the winding diameter (R2).

As described above, the constant tension control device according to the present invention includes a detector that detects the amount related to the winding diameter of the strip material in the winder, and a constant tension across the unwinder based on the output of this detector. It consists of an arithmetic unit that calculates the tension control value so that the tension control value is maintained, and a braking device for the unwinding machine that controls the braking force based on the calculated control value, so that the tension of the strip material on the side of the unwinding machine is always constant. can be kept. Moreover, the structure is simple and can be provided at low cost, and it can be applied to all kinds of strip materials. Further, there is no risk of damaging the strip material, and periodic maintenance and inspection are not required.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the overall configuration of a constant tension control device applied to a rolling line, Fig. 2 is a block diagram showing the configuration of a controller, and Fig. 3 is a block diagram showing the configuration of a constant tension control device applied to a rolling line. It is a graph showing changes in variables. (1)...- Rewinding machine, (2)... Winding machine, (4)・■
Air brake, (5)・■DC shunt motor, (5a)
...Field winding, (6)...Electro-pneumatic converter, (7)...
・Field current detector, (8)...controller, (91---
Tension setting device, ■Fist... Multiplier, OaO/Subtractor, (S
)・−・Strip material. Patent applicant Showa Aluminum Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] In a system that includes a winder and an unwinder, and a strip material of the unwinder is wound up by the winder, the unwinder is controlled so as to keep the tension of the strip material constant. A device that detects an amount related to the winding diameter of a strip material in a winder, and calculates a tension control value such that the tension on the side of the unwinder is constant based on the output of this detector. A constant tension control device for a rewinding machine, comprising: a calculation device; and a braking device for the rewinding machine whose braking force is controlled based on the calculated control value.