JPS59169618A - Device for controlling winding of steel strip - Google Patents

Abstract

PURPOSE:To keep the peripheral speed of pinch rolls lower than the speed of a steel strip for keeping a back tension constant and to improve the winding of the strip, by providing a strip tail-end detector to a final finishing stand as well as providing a back-tension controlling device and a speed controlling device to the pinch rolls. CONSTITUTION:A detector 30 detects the moment just before the tail end of a steep strip X runs out of a final finishing stand A, to output its signal (alpha) to a back tension controlling circuit 11 and speed controlling devices 20a, 20b. The devices 20a, 20b are provided to upper and lower pinch rolls 3a, 3b respectively and are constituted of speed regulators 21, 21, redctifiers 22, 22, rotary generators 23, 23, and an adder 24, respectively. A strip speed (a) and a slip set value (b) are previously inputted to the adder 24, which outputs them at the speed references. Further, a switch 240 is provided to the inputting side of slip setting. Accordingly, the output of the adder 24 is a strip speed when the output of the detector 30 is OFF. Further, the speed reference of the adder 24 is inputted to the regulator 21 and is compared with a feedback signal of a motor 4 of the generator 23 to output the result to the recitifier 22 as a control signal thereby rotating the motor 4 at the number of revolutions corresponding to the speed reference.

Description

[Detailed description of the invention] The present invention relates to a copper strip winding control device.

The copper wire that has come out of the finishing mill is wound onto the carp 2, and at the end of the winding, winding is performed while applying shivering tension to the vinyl roll.

Figure 1 is an explanatory diagram thereof, (1) is the mandrel, (2
)a-'t motor, and this mandrel (1) and motor (2) constitute a carp 2. Mandrel (1)
Upper and lower pinch rules (3a) (ab) are arranged in front of the. At the beginning of winding, the copper strip (3) is attached to the mandrel (1
) and the final finishing stand (false),
Since the finishing stand (false) has applied the shivering tension many times, there is no need to apply the shivering tension to the vinyl roll (3).

However, after the tail end of the copper strip (A) passes through the finishing stand (A) until it passes through the pinch rule (3), there is a constant back tension (F) between the steel strip with respect to the mandrel (1) K.
back) for better winding.
I have to. (4a) (4b) is vintilol (3a
) (3b) motor, (5) is the upper pinch roll (3a
) is a cylinder for applying a predetermined pressing force to the cylinder.

By the way, the back tension (Fback) mentioned above is
Fback-μ・P where p: Friction coefficient (between the strip and pinch roll) P: It is expressed as the pinch roll pressing pressure, but since P is constant during operation, the value depends on the friction coefficient μ. υ, steel strip (X) The tension applied to VC varies and it is rarely possible to wind it into a coil with a uniform force.

Also, when the back tension (F'back) changes in this way, the winding tension (FMAND) of the mandrel (1) changes.
), when FMAND > Fback, the inside of the copper band on the hot run table (6) is accelerated, and when FMAND < Fback k, it is decelerated. This back tension (Fbac
k) When acceleration and deceleration due to K are repeated, undulations occur in the copper strip on the hot run table (6), and a phenomenon called "folding" occurs, resulting in a significant deterioration in product yield.

On the other hand, the pinch roll (3) is normally operated at a circumferential speed that is lower than the speed inside the copper strip, which causes slip between the inside of the copper strip and the pinch roll (3), )
This is to correct the meandering by slipping when it occurs.

Therefore, if no slip occurs between the copper strip (A) and the pinch roll (3), the meandering of the copper strip (Kl) will not be corrected, and there is a problem that the shape of the winding coil will become a so-called "bamboo shoot" shape. .

However, since the motor (4) of the conventional pinch roll (3) performs current control operation, there is a drawback that when the above-mentioned back tension (Fback) increases, the speed of the pinch roll increases.

That is, the friction coefficient μ increases and the back tension (Fb
When ack ) increases, the pinch roll (3) is dragged into the fast-moving copper strip and receives the rotational force from the copper strip (a), so the current tends to increase, but the current is controlled. Therefore, the current is held constant, and the rotation of the pinch roll (3) becomes faster accordingly. The result was a story of a pinch.
The rotation of the steel strip opening speed Kit (3) becomes close to the steel strip opening speed Kit, and no stripping occurs.

As mentioned above, conventional winding devices have the disadvantage that they cannot wind with a uniform force because the tension (pbaek) changes, and that "folds" and "bumps" occur. was there.

The present invention has been made to improve the above-mentioned drawbacks of the prior art, and includes a detector that detects the tail end of the copper strip just before it passes through the final finishing stand, and a back-tension system that controls the pressing force of the pinch roll. The following is an embodiment of the present invention, which is basically characterized by comprising a control device and a speed control device that maintains the circumferential speed of the pinch roll at a predetermined speed lower than the speed of the copper strip (a). An example will be explained based on the drawings.

In FIG. 2, the same parts as in FIG. 1 are given the same numbers.

The control device according to the present invention comprises a back tension control device α
1, a speed control device and a detector.

The detector (7) detects the tail end of the copper strip (A) just before it passes through the final finishing stand (AI).
This detection signal @) is output to the back tension control device Q1 and speed control device H to start back tension control and speed control of the pinch roll (3).

The speed control device (zoa) (20b) is installed on the upper and lower pinch rolls (3a) and (3b), respectively, and includes a speed regulator (c) (2), a rectifier (2) (a), and a rotary generator (ha). )(2) and an adder (goods). Adder UK is input with steel strip speed 0 and slip setting value ■, where speed reference (Vout) = -a (-〇+■) [G = z]
is output. There is a switch (24) on the slip setting input side.
0) is provided, and is turned on by the timing signal () from the detector (1). Therefore, when the output from the detector (G) is OFF, the adder (
The output from c) is the same as the copper strip speed itself, and the pinch roll (3) is operated at the same speed as the copper strip speed. Adder (c)
The speed reference (Vou, t) output from the speed regulator a
1K is input, compared with the feedback signal of the motor (4) from the rotary generator, and output as a control signal to the rectifier (2).
t). From this K, the circumferential speed of the pinch roll (3) becomes slower than the copper strip speed by the syslip setting.

The back tension control device α1 includes a back tension control circuit α and a back tension setting mechanism (2). The applying mechanism (b) includes a lever (122) that moves the upper pinch roll (3a) up and down, and this lever (
122) and the cylinder (122) that moves the cylinder (122).
It is composed of two hydraulic power sources (123) and a solenoid valve (120).

The solenoid valve (120) is controlled by the output of the control circuit C11), and is configured to raise or lower the cylinder (5) depending on the output.

As shown in FIG. 3, the control circuit H is composed of an adder (110), a comparator (111), and a relay (112). The adder (110) has a switch (113) where the current setting value (■ and back tension setting value Q) during steady winding
) It is input more selectively than K. The switch (113
) operates according to the output of the detector (1), and the copper band (a)
When removing the stand at the tail end, the trap is such that when the previous timing signal (B) is received, the set value 0 is turned ON and the set value ■ is turned OFF.

The back tension set value @ is added to the back tension feedback signal ■■ in the adder (110), where the calculation of Vout=G(■−■−■) is performed, and the result is sent to the comparator (111) K
Output. The comparator (111) is + of Vout,
- is judged, and if it is 10 (that is, the feedback signal is large), the relay (H2a) is turned on. This causes the stain solenoid valve (120) to operate, raising the cylinder (121),
Move the upper pinch sail (3a) upward. Also Vou
If t is -, the relay (nzb) is turned on and the upper vinyl roll (3a) is moved downward to increase the back tension.

Here, the back tension feedback signals ■,■ are
Rectifier (2) of speed control device (20a) (2ob) respectively
(2) The current value is detected by the current detector (114) provided at K. Since speed control is performed here,
When the back tension increases or decreases, the current value in the motor circuit changes, and the back tension can thereby be detected. Therefore, the back tension setting value 0 is also given as the flow value (Ip) in the following formula.

I,=Fxn×1o3A K Next, the operation will be explained.

While the copper strip (XI) is in the final finish rolling mode, the copper strip speed of 0 is input to the speed control device (20a) and (20b) buttons, and the pinch roll (3) is operated at the same speed as the steel strip head. ing.

On the other hand, in the back tension control device DI, an adder (11
The steady winding current setting value ■ is input to 0), but this setting value is approximately zero, and no pressing force is applied to the upper pinch roll (3a).

Immediately before the tail end of the copper strip (A) passes through the finishing mill (At,
When detected by the detector (20), the speed control device (20
a) (20b) speed regulator al) K is the speed reference (V
out) = G (■-■) is input, and the pinch roll (3) is operated at a circumferential speed that is slower than the speed of the copper strip (3). On the other hand, the adder (11
G) The back tension setting value ■ is input to the VC, and an output of Vout = −G (■−■−■) is obtained.

Now, when the friction coefficient μ between the steel strip flashing and the pinch roll (3) increases and the back tension Fback=μ・P increases, the current detected by the detector (114) increases and the one-turn feedback value ■, ■ becomes larger, Vou
t is 10. Then, when the lever v-(llza) is ON, the pinch ``-rule (:(a)) is pushed upward, and as a result, the pressing pressure P decreases, and the back tension yFback=
p-P decreases until Vout=OK. Vout
= 0, the solenoid valve (120) becomes neutral, the cylinder (5) maintains its pressing force, and the back tension Fback''μ·P is kept constant.

The friction coefficient μ becomes smaller and the back tension Fba
When ck = μ・P becomes smaller, the pressing force P increases due to the operation opposite to the above, and the back tension Fback =
=μ@P is kept constant.

When the tail end of the steel strip head pulls out the vinyl roll (3), the above-mentioned control is completed and preparations are made for the arrival of the next steel strip head.

As explained above, the control device of the present invention can maintain the circumferential speed of the pinch roll at a speed lower than the copper strip speed,
Moreover, since the back tension can be kept constant, there is an effect that good winding can be performed.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the winding device, FIG. 2 is a block diagram showing an embodiment of the control device according to the invention, and FIG. 3 is a block diagram of the control circuit. α1...back tension control device, (e)...speed control device, (7)...detector. Patent applicant Nippon Kokan Co., Ltd.

Claims (1)

[Claims] A detector that detects the tail end of the copper strip just before it passes through the final finishing stand, and a back tension control device that controls the pressing force of the vinyl roll to a constant value based on the signal from the skeleton detector. and a speed control device for controlling the circumferential speed of the vinyl roll to a speed slower than the speed of the copper strip in response to a signal from a slip detector.