JPH0663629A - Looper - Google Patents

Abstract

PURPOSE:To prevent a looper roll from being broken by an excessive force and to prevent the deterioration of a tension detecting accuracy. CONSTITUTION:In a looper wherein the looper roll 11 is supported to be capable of oscillation by a lever arm 12 and a torsion bar 13 and a face applied to the looper roll 11 is detected by measuring a twisting load to the torsion bar 13, an oscillation limiting member 15 positioned at a prescribed distance S from a shaft box 17 of the looper roll 11 being an oscillating part is provided on a supporting body 14 supporting the torsion bar 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a looper having a looper tensiometer for controlling the tension of rolled material.

[0002]

2. Description of the Related Art As a device for controlling the tension of a rolled material (strip) between roll stands in a finishing line of a continuous hot rolling mill, a roll of a looper is provided with a load cell (for example, Japanese Patent Publication No. 58-26542). No. publication) is known. However, such a load detection device
Since a leaf spring or the like is required to maintain the positional relationship between the looper roll and the load meter in a measurable state, the thermal deformation of those members may reduce the accuracy of the detected value. In order to prevent such a situation, the looper roll is supported by the lever arm and the torsion bar,
A configuration has been proposed in which the tension of a rolled material is detected by measuring the torsion load of a torsion bar.

As shown in FIG. 3, in the conventional looper tensiometer of this type, a shaft box 2 of a looper roll 1 is attached to a lever arm 3 of the looper roll 1.
Also, the force applied to the looper roll 1 is attached to the support 5 via the torsion bar 4, and the force applied to the looper roll 1 is converted into swinging around the axis of the torsion bar 4 by the lever arm 3. Then, the torsional load of the torsion bar 4 is measured by the gauge 6, the measured value is amplified by the amplifier 7 and input to the controller 8, and the tension T of the rolled material 9 is detected and controlled. .

[0004]

The force applied to the looper roll 1 (downward component force t of the tension T) is not so large during normal transfer, but after the rolled material 9 is greatly loosened upward. When the looper roll 1 collides with the looper roll 1 when returning to a horizontal state, a large force (overload) is applied to the looper roll 1. That is, there is a problem that the torsion bar 4 as a load cell is broken due to excessive swing of the looper roll 1.

Such an impact force is irrelevant to the tension T related to the actual control, and it is not necessary to measure it. However, if the torsion bar 4 that can withstand a large force is used, the sensitivity is remarkably lowered and the detection accuracy is lowered. It gets worse.

In view of the above circumstances, the present invention was devised to provide a looper capable of preventing damage to the looper roll due to an excessive force and not deteriorating the tension detection accuracy.

[0007]

According to the present invention, a looper roll is swingably supported by a lever arm and a torsion bar, and a force applied to the looper roll is detected by measuring a torsion load on the torsion bar. In the above, a swinging limiting member located at a predetermined distance from the swinging portion is provided on a support body that supports the torsion bar.

[0008]

With the above structure, when the rocking roll is swung by a large impact force or the like about the axis of the torsion bar by a predetermined amount or more, the rocking restricting member comes into contact with the shaft box or the like so as to contact the torsion bar. Prevent it from deforming excessively.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show an embodiment of the looper according to the present invention. This looper supports the looper roll 11 swingably by a lever arm 12 and a torsion bar 13, and detects the force applied to the looper roll 11 by measuring the torsion load on the torsion bar 13 as in the conventional case. Has become
A support 14 that supports the torsion bar 13 is provided with a swing limiting member 15, which is a feature of the present invention.

The lever arm 12 has one end attached to a shaft box 17 that rotatably supports the shaft end 16 of the looper roll 11, and the other end attached to one shaft end of the torsion bar 13. The torsion bar 13 has a shape in which the central portion is slightly constricted, and is formed with a strength such that appropriate torsional deformation occurs within the range of tension for normal rolling material transfer. Also, the other shaft end of the torsion bar 13
It is attached to a side surface portion of a support body 14 provided substantially parallel to the rolled material 9. Further, a strain gauge (not shown) for measuring the torsional deformation is attached to the surface near the center of the torsion bar 13.

The rocking restricting member 15 receives the impact force from the rolled material 9 and the looper roll 11 and the axle box 1.
7 is molded to have a rigidity so that it can properly support 7, is integrally attached to the end of the support 14 on the side of the looper roll 11, and is extended below the shaft box 17 which is a swinging portion. ing. A contact surface 18 is formed on the upper surface of the extending end, and is separated from the lower surface portion 19 of the axle box 17 by a predetermined distance S. The spacing S is set such that the torsion bar 13 is in a state in which the shaft box 17 is in contact with the swing limiting member 15.
Is set to, for example, 1 mm or less so as to be within the elastic deformation region where plastic deformation does not occur. In this contact state, the tension T related to the operation control of the rolling mill (not shown)
Is formed so as to be outside the measurement range of.

In addition to this, the support 14 has a looper roll 1
A shaft 20 is attached to the side opposite to the side 1 and is rotatably supported by a frame 21 via a bearing bracket 22. Then, the shaft 20 is appropriately rotated by the motor 23, so that the function as a looper for the rolled material 9 is achieved.

Next, the operation of this embodiment will be described.

During normal transfer of the rolled material 9, the force applied to the looper roll 11 causes the shaft box 17 and the lever arm 12 to swing around the axis of the torsion bar 13, and the torsional deformation of the torsion bar 13 is strain gauge. Is measured, the tension T of the rolled material 9 is detected, and the speed control of the rolled material 9 is performed. Then, when a large impact force from the rolled material 9 is applied, the looper roll 11 is strongly pushed downward, but the rocking restricting member 15 abuts the shaft box 17 on the lower side thereof to prevent excessive rocking. In rare cases, the torsion bar 13 is prevented from being deformed beyond the measurement range.

As described above, since the swing limiting member 15 is attached to the support body 14 below the shaft box 17 at a predetermined interval S, the looper roll 11 swings due to an excessive impact force and the torsion bar 13 and the strain gauge. Can be prevented from being damaged. That is, it is not necessary to excessively increase the rigidity of the torsion bar 13, and it is possible to form a highly sensitive load cell that is optimum for the tension measurement range.

Further, by changing the height (thickness) of the contact surface 18 of the swing limiting member 15, the distance S from the shaft box 17 can be adjusted, and the torsion bar according to the tension T range of the rolled material 9 and the like. The deformation restriction of can be easily changed.

[0018]

In summary, according to the present invention, the following excellent effects are exhibited.

Since the support for supporting the torsion bar is provided with the rocking limiting member located at a predetermined distance from the rocking portion, damage of the torsion bar can be prevented and the tension detection accuracy can be improved. You can

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a looper according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a perspective view showing a conventional looper tensiometer.

[Explanation of symbols]

 11 Looper Roll 12 Lever Arm 13 Torsion Bar 14 Support 15 Swing Limiting Member 17 Shaft Box (Swinging Part) S Predetermined Interval

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Mitai 1 Nishinosu, Oita City, Oita Prefecture Shin-Nippon Steel Co., Ltd. Oita Works (72) Kenichi Yasuda 1- Nishinozu, Oita City, Oita Prefecture New Japan Oita Steel Co., Ltd. (72) Inventor Tomoaki Mori 2-6-3 Otemachi, Chiyoda-ku, Tokyo New Nippon Steel Co., Ltd.

Claims (1)

[Claims] 1. A looper in which a looper roll is swingably supported by a lever arm and a torsion bar, and a force applied to the looper roll is detected by measuring a torsion load applied to the torsion bar. A looper, characterized in that a rocking restricting member located at a predetermined distance from a rocking portion is provided on a supporting body to be supported.