JPS5919532Y2 - Cold rolling mill rewinding control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a cold rolling mill glue winding control device, and more particularly to a winding control device that enables stable rewinding at high speeds.

In reversible cold rolling mills, a handling device for taking out the coil is often attached to only one reel side.

In such a rolling mill, if the final pass ends on the reel side that does not have a coil handling device due to the pass schedule, the coil is rewound to the other reel without rolling, or so-called rewounding. .

Furthermore, in both reversible and irreversible cold rolling mills, the coil may not be able to be pulled out of the take-up reel mandrel for some reason at the end of the final rolling. Rewinding is also performed in such cases.

Now winding can be done smoothly by controlling the speed of the reel on the coil winding side and controlling the tension on the reel on the coil unwinding side, but with conventional equipment, the reel is controlled proportionally to the back electromotive force of the motor and the line speed. It was only equipped with a tension control circuit that kept the winding tension constant by controlling the armature current to a constant value, making it impossible to control the speed of the reel.

For this reason, rewinding has conventionally been carried out using the difference in tension between the winding side and the unwinding side, but with this method, the rolls on the mill stand are left with a sufficient gap during rewinding, so that the rolls are not separated from the strip. Since the stripping speed was not driven, the stripping speed became extremely unstable, and work could only be done at low speeds, resulting in extremely poor workability.

On the other hand, it is conceivable to attach a speed detector to the deflector roll to detect the line speed and control the speed of the winder, but as the strip thickness becomes thinner, the deflector roll cannot take too much tension. First, as the line speed increases, a slip phenomenon occurs, so the controllable range is very narrow and workability can only be improved slightly.

The present invention has been made to eliminate the above-mentioned disadvantages of conventional devices, and aims to provide a rewinding control device that can perform rewinding at high speed and stably despite its simple configuration. .

The present invention will be described in detail below with reference to embodiments shown in the drawings.

In the figure, the strip S is stretched between the left reel 1L and the right reel 1R, and is wound onto and rewound onto both reels.
It is rolled to a predetermined thickness by work rolls 3a and 3b backed up by .

4L and 4R indicate deflector rolls for suppressing fluctuations in the pass line due to changes in the coil diameter of the reel.

The work roll driving electric motor 5 is controlled by a speed control device 6 to drive the work rolls 3a, 3b.

Further, the circumferential speed of the work roll is determined by the work roll driving electric motor 5.
is detected by the tachometer generator 7 and fed back to the speed control device 6 together with a reference signal from the line speed reference circuit 8.

The output of the tachometer generator 7 is also input to the line speed signal terminals 10 of the left reel control circuit 9L and the right reel control circuit 9R as a line speed signal during normal tension control.

Note that the configurations of the left and right reel control circuits 9L and 9R are completely the same, so in the following explanation, the left reel control circuit 9
The details of only L will be explained.

The line speed signal input to the terminal 10 is a contact a (a contact that closes during normal tension control).

The line speed reference signal input to terminal 11 is connected to the B contact (the contact that closes during recoiling work).

(the same applies hereinafter) and are led to separate points 12 through terminals 13 and 13.
The back electromotive force signal of the left reel driving motor 14 input to the
After subtracting the signal (signal obtained by subtracting .

The tension reference signal inputted to the terminal 16 passes through the a contact, is added to the output of the voltage control circuit 15 at the addition point 17, and then is led to the current reference conversion circuit 18.

The current reference signal obtained by this conversion circuit has an addition point of 1
After being modified at 9 with a feedback signal proportional to the armature current of the motor 14, it is directed to a current control circuit 20.

The current control signal obtained by this current control circuit is converted into a thyristor firing pulse in the phase control circuit 21, and controls the thyristor 22 to control the armature current of the motor 14.

On the other hand, the line speed signal inputted to the terminal 10 and the back electromotive force signal of the motor 14 inputted to the terminal 13 are guided to the coil diameter memory 24 via the separation point 23, and the coil diameter of the left reel is calculated.

The coil diameter signal thus obtained is led to the conversion circuit 25 through the a contact, where it is converted into a field current reference signal for the motor 14.

This field current reference signal is corrected by a feedback signal proportional to the field current at an addition point 26 and then guided to a field current control circuit 27.

The field current control signal obtained here is guided to the phase control circuit 28 and converted into a thyristor firing pulse.

The left reel mandrel driven by the left reel drive electric motor 14 is provided with a pulse transmitter 29 for detecting its rotational speed, and the output of this transmitter is used for the winding and reel mandrel for determining the rotation direction of the left reel. The signal is inputted to a count circuit 31 via a rewind determination circuit 30.

This counting circuit calculates the number of rotations of the left-hand mandrel,
The count is accumulated from the start of winding, and the count result is led to the coil thickness calculation circuit 33 together with the strip thickness signal input to the terminal 32.

This arithmetic circuit calculates the coil thickness on the left reel mandrel by multiplying the above-mentioned two-person force signals.

Further, an outer diameter value signal indicating the outer diameter of the left reel mandrel according to a setting is given to the terminal 34 from a circuit not shown, and this and the coil thickness signal are connected to the addition point 25 to form a coil outer diameter calculation circuit. 36.

The coil outer diameter signal obtained by this arithmetic circuit is input to the above-mentioned conversion circuit 25 through the b contact.

The above is the configuration of the left reel control circuit 9L, but the configuration of the right reel control circuit 9R is also similar to this.

Next, the operation of the device of the present invention will be explained by taking as an example the case where the strip S is pulled out from the right reel 1R and wound onto the left reel 1L.

During normal rolling work, the terminal 10 is the same as in the conventional example.
The line speed signal input to the terminal 13 is proportional to the back electromotive force signal of the reel driving motor 14 input to the terminal 13, and the armature current of the motor 14 is made to match the value of the tension reference signal input to the terminal 16. By controlling the reel, the right reel is controlled to have a constant unwinding tension, and the left reel is controlled to be a constant winding tension.

During the rewinding operation, the left reel is controlled so that the coil circumferential speed matches the line speed reference signal, and the right reel is re-rolled under constant tension control as in the rolling operation.

That is, in the left reel control circuit 9L on the winding side, the b contact is closed, and the drive motor 14 receives its back electromotive force (terminal 13
) is voltage controlled through a voltage control circuit 15 so as to match the line speed reference signal (terminal 11).

On the other hand, the field of the electric motor 14 is controlled to compensate for changes in the circumferential speed of the coil due to the thickening of the coil.

In other words, the count circuit 31 counts the number of revolutions of the left reel mandrel from the start of winding.
The coil thickness calculation circuit 33 multiplies the strip plate thickness signal from 2 and adds the left-hand mandrel outer diameter value signal to the coil thickness calculation circuit 36. A coil outer diameter signal is obtained.

This coil outer diameter signal is guided to the conversion circuit 25 through the b contact, and inputted as a field current reference signal to the field current control device 27 to control the field current.

In this case, as is well known, there is a relationship between the rotation speed N of the DC motor, the back electromotive force E, and the field magnetic flux φ, as N = E/φ, where K is a constant, and the circumferential speed of the coil is In order to make it constant with respect to the coil diameter, V=2rDN=2 πDxK@E/φ and 1・E −D/φ However, since K1 is a constant, the coil diameter and field magnetic flux The field current may be controlled so that φ is proportional.

In other words, in order to match the circumferential speed of the coil (line speed) with the line speed reference signal, the back electromotive force of the motor is made proportional to the line speed reference signal, and the field current is made so that the field magnetic flux and the coil diameter are proportional. It just needs to be controlled.

In the apparatus of the present invention, the left reel 1L on the take-up side is controlled so that the circumferential speed of the coil matches the line speed reference signal as described above.

Further, the right reel 1R on the rewinding side is controlled to have a constant tension, but the line speed at that time uses the line speed reference signal inputted to the terminal 11R, similarly to the left reel 1L.

In contrast to the above, when rolling or rewinding is performed from the left reel to the right reel, it goes without saying that the control methods for both reels may be reversed.

As mentioned above, in the device of the present invention, the back electromotive force of the reel driving motor on the winding side is made proportional to the line speed reference, and the field current is controlled so that the field magnetic flux and the coil diameter are proportional. Since the speed is controlled, rewinding can be carried out at high speed and stably without causing slippage or other instability that occurs when speed control is performed by taking the line speed from a deflector roll or the like. can.

In addition, the coil diameter detection circuit for field control can be used for displaying the number of laps, automatic deceleration, etc., and can also be used in place of the coil diameter memory circuit during tension control, except during rewinding work. It has excellent cost performance as it can be used for multiple purposes.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the device of the present invention. S... Strip, It, IR... Reel (subscript indicates left side, R indicates right side), 3a, 3b... Work roll, 4L, 4R... Deflector roll, 5...
・Work roll drive electric motor, 6...Speed control device, 7
...Tachometer generator, 8...Line speed reference circuit, 9
L, 9R... Reel control circuit, 10... Line speed signal terminal, 11... Line speed reference signal terminal, 13
... Back electromotive force signal terminal, 14 ... Reel drive motor, 15 ... Voltage control circuit, 16 ... Tension reference signal terminal, 20 ... Current control circuit, 21 ... Phase control circuit , 22... Thyristor, 24... Coil diameter memory, 25... Conversion circuit, 27... Field current control circuit, 28... Phase control circuit, 29... Pulse oscillator, 30 . . . Winding/unwinding L discrimination circuit, 31 . . . Count circuit, 32 . . . Strip thickness signal terminal, 33.
. . . Coil thickness calculation circuit, 34 . . . Mandrel outer diameter value signal terminal, 36 . . . Coil outer diameter calculation circuit.

Claims (1)

[Claim for Utility Model Registration] Reversing type cold rolling machine glue winding in which a strip is fed forward and backward between a pair of reels, one of which is an unwinding reel, and the other of which is a take-up reel, which are arranged to sandwich a rolling roll. The control device includes a DC motor that drives the take-up reel, a first circuit that outputs a signal according to the thickness of the strip according to settings, and an output that outputs a signal according to the diameter of the mandrel of the take-up reel according to settings. a second circuit that generates output according to the rotation speed of the mandrel; and a third circuit that generates an output corresponding to the rotation speed of the mandrel; and the outputs of these first to third circuits are given, a circuit that calculates the coil diameter of the take-up reel by adding the products; a circuit that controls the field current of the DC motor so that the field magnetic flux of the DC motor is proportional to the output of the calculation circuit; A cooling device comprising: a circuit that outputs a signal according to a back electromotive force of the electric motor; and a circuit that compares this back electromotive force with a line speed standard of the rolling mill to control an armature current of the electric motor. Inter-rolling mill glue winding control device.