JP2926866B2 - How to open and close the tension leveler roll - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of opening or closing a roll of a tension leveler at the start and end of use of the tension leveler.

[Prior Art] A metal strip passing apparatus having a tension leveler corrects middle elongation and ear waves generated in a metal strip during rolling so that a smooth metal sheet can be obtained.

An example of the metal strip passing equipment having the tension leveler will be described below with reference to FIG. That is, the threading equipment includes a payoff reel 22 for feeding out the steel strip 21 and a welder 23 for connecting and connecting the rear end of the preceding metal strip 21 and the front end of the subsequent metal strip 21.
An entrance bridle roll 24 for applying tension to the metal band 21, a tension leveler 25, and an exit bridle roll 26 for applying tension to the metal band 21 in combination with the entrance bridle roll 24; And a tension reel 27 that winds the tape while applying tension. The tension leveler 25 is described in more detail.
Is to remove the middle stretch and ear waves
And a straightening roll 25b for correcting an extreme warpage caused by local stretching.
Note that reference numerals 28 and 29 in the figure are pass line rolls.

To remove elongation and ear waves in the metal band 21 with the metal band passing plate equipment having the tension leveler 25 described above, the metal band 21
Since it is premised that stretching is performed by the stretching rolls 25a while applying tension to the metal strip, if the straightening work is performed for each metal strip, an uncorrected portion is generated at the front end and the rear end of the metal strip 21,
In addition, since the threading is troublesome, the metal strip 21 is connected to the front and rear ends by the welder 23, and the straightening operation is performed in an endless state. The connecting portion 21a of the preceding metal band 21 and the following metal band 21 is wrapped and welded as shown in FIG. Therefore, this weld
When 21a passes, each roll of the tension leveler 25 must be opened to scratch the roll.
When a is approaching the entrance of the tension leveler, the rolls of the tension leveler 25 are simultaneously opened, and the welding section 21a exits the tension leveler and then simultaneously closes the rolls again.

[Problems to be Solved by the Invention] However, the conventional roll opening / closing method of the tension leveler 25 has the following problems. That is, for example, when the welded portion 21a reaches the entrance of the tension leveler 25, and all the rolls of the tension leveler 25 are opened at the same time, as shown in FIG. 4, from the first extension roll 25a of the tension leveler of the metal band 21. Since the portion between the first straightening rolls 25b (A) is locally stretched by the stretching rolls 25a, the shape is bad because large warpage remains generated. Also, the straightening roll 25b of the metal band 21
The intermediate portion (B) still has a moderate degree of warpage because the correction has not been completed. Further, the portion corresponding to the length of the tension leveler 25 behind the welded portion 21a of the next metal band 21 has not undergone any middle elongation or ear wave correcting work. Therefore, there is a problem that the portion where such correction is insufficient or the uncorrected portion does not become a product and yield loss is caused, so that the yield is reduced. An even bigger problem is that these defective parts are
Before winding, the sheet is removed by cutting with a shear (not shown) provided in front of the tension reel 27 or a cutting board facility in the next step. The area marked with a large warp is rounded as soon as it is cut, and it takes about 10 minutes / time to remove the defective part that has become in this state. It is a factor that lowers.

Similarly, when there is a defect on the leveler roll, such as a defect that breaks the metal band by passing through the tension leveler, or a defect on the metal band that breaks the metal band in the metal band, Also, when the defective portion passes through the tension leveler, there is the same problem as described above.

The present invention solves the above-mentioned problems of the prior art, and a tension leveler roll in which an insufficiently straightened portion does not occur in a metal band being straightened or an unstraightened portion does not occur. It is intended to provide an opening and closing method.

[Means for Solving the Problems] In the method for opening and closing a roll of a tension leveler according to the present invention, a connecting portion or a defective portion for connecting a metal band to a metal band includes:
In a method of opening or closing a roll of a tension leveler as it passes through a tension leveler, a distance shorter than a distance between rolls of the tension leveler in front of the connection portion or the defective portion of a metal band passing through the tension leveler. Each time a given point passes through each roll of the tension leveler, the rolls are sequentially opened, and any point that is shorter than the distance between the rolls of the tension leveler behind the connection portion or the defective portion. Each time a point passes through each roll of the tension leveler,
This is a roll opening / closing method of a tension leveler for sequentially closing the rolls.

[Operation] In the method for opening and closing a roll of a tension leveler according to the present invention, the connecting portion or the defective portion for connecting the metal band to the metal band includes:
In a method of opening or closing a roll of a tension leveler as it passes through a tension leveler, a distance shorter than a distance between rolls of the tension leveler in front of the connection portion or the defective portion of a metal band passing through the tension leveler. Each time a given point passes through each roll of the tension leveler, the rolls are sequentially opened, and any point that is shorter than the distance between the rolls of the tension leveler behind the connection portion or the defective portion. Each time a point passes through each roll of the tension leveler,
The rolls are sequentially closed. This operation will be described as follows.

The connection part that connects the metal band and the metal band is connected with the metal band wrapped up and down, so it can be easily detected with the existing detector, so before the connection part enters the tension leveler Detected and calculated by an arithmetic unit the time from the time of detection to an arbitrary point (e.g., 500 mm) in front of this connection point to each roll of the tension leveler, and the calculated time is sequentially calculated from the entrance side of the tension leveler. Open role based on. In addition, an arithmetic unit calculates the time from when the arbitrary point (for example, 500 mm) behind the connection portion reaches each roll of the tension leveler after the detection,
The roll is closed based on the calculated time sequentially from the entrance side of the tension leveler.

In this way, the part of the metal band that is not corrected by the tension leveler is, for example, 500 m before and after the connection part.
m, total 1000mm only. If the detection accuracy of the connection portion is increased, the portion of the metal band that is not corrected can be further reduced, and a decrease in the yield can be prevented, and the removal of the defective portion does not require much time.

Example A method of opening and closing a roll of a tension leveler according to an example of the present invention will be described with reference to FIGS. 1A to 1H in the case of a steel strip. In FIG. 1, a hatched portion of the roll indicates a state where the roll is open, and a non-shaded portion indicates a closed state. In this opening / closing method, the welding portion W of the steel strip 5 is detected by an existing detecting means such as an optical method before reaching the tension leveler, and an arbitrary point C in front of the welding portion W is detected based on the detection signal. The time from when the welding point W is detected by the arbitrary point D behind and when the arbitrary point D passes through each roll is calculated by the calculating means, and based on the calculation result, the arbitrary point C is calculated.
Open each roll at the time when passes through each roll,
Each roll is closed when an arbitrary point D passes through each roll.

In FIG. 1A, since the point C has passed through the first extension roll 1, the first extension roll 1 is opened.

In FIG. 1 (b), since the point C has passed through the second extension roll 2, the second extension roll 2 is opened. At this time, since the point D has not reached the first extension roll 1, the first extension roll 1 is not closed, and the first and second extension rolls 1 and 2 are simultaneously opened.

In FIG. 1 (c), since point D has passed through the first extension roll 1, the first extension roll 1 is closed and only the second extension roll 2 is open.

In FIG. 1 (d), point D has passed through the second extension roll 2, so that the second extension roll 2 is closed. And
Since point C has not reached the first straightening roll 3, all rolls are closed.

In FIG. 1 (e), since the point C has passed through the first straightening roll 3, the first straightening roll 3 is opened and only the first straightening roll 3 is opened.

In FIG. 1 (f), the point D has passed through the first straightening roll 3, so the first straightening roll 3 is closed. At this time C
Since the point has not yet reached the second straightening roll 4, all rolls are closed.

In FIG. 1 (g), since the point C has passed through the second straightening roll 4, the second straightening roll 4 is opened.

In FIG. 1 (h), point D has passed through the second straightening roll 4, so that the second straightening roll 4 is closed and all rolls are closed. Until the welded portion W reaches the first extension roll 1.

Since the method of opening and closing the roll of the tension leveler according to one embodiment of the present invention is performed as described above, the portion where the steel strip is incompletely corrected or uncorrected is from the point C to the point D before and after the welded portion W. And the portion where the correction is incomplete or uncorrected is significantly reduced as compared with the related art.

Arbitrary points such as point C and point D vary depending on the detection accuracy and tracking accuracy of the welded part. Even at the current technical level, if the point is about 500 mm before and after the welded part, the welded part is bitten by a roll. There is no.

In addition, the present invention can also be applied to a defective portion that similarly damages a roll of a steel strip, or even when a steel strip is broken by passing through a leveler, if there is a defect detection unit, and the roll can be opened and closed. The opening and closing may be performed manually or automatically.

[Effects of the Invention] According to the present invention, the number of uncorrected portions of the steel strip is reduced and the yield is improved, and the number of labor and time for removing the uncorrected portions is reduced, and the operation rate is improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a method for opening and closing a roll of a tension leveler according to one embodiment of the present invention, FIG. 2 is an explanatory view showing an equipment configuration of a steel strip passing plate having a tension leveler, and FIG. FIG. 4 is a side view showing a connection portion of the metal band, and FIG. 4 is an explanatory diagram showing a correction state of the metal band when each roll of the tension leveler is opened. 1... First stretch roll, 2... Second stretch roll, 3
...... First straightening roll, 4 ... Second straightening roll, 5 ...
... Steel strip, W ... Weld, C ... Arbitrary point to open roll, D ... Arbitrary point to close roll.

Claims (1)

(57) [Claims] A method for opening or closing a roll of a tension leveler as the connection or defect connecting the metal strips passes through the tension leveler. Each time any point at a distance shorter than the distance between the rolls of the tension leveler ahead of the connection portion or the defective portion passes through each roll of the tension leveler, the rolls are sequentially opened, and the connection portion or The tension leveler is characterized in that each time any point at a distance shorter than the distance between the rolls of the tension leveler behind a defective portion passes through each roll of the tension leveler, the roll is sequentially closed. How to open and close.