JPH07113601A - Meandering detector for strip material - Google Patents

Abstract

(57) [Summary] [Object] To provide a meandering detection device for a strip material. [Structure] A turning guide 12 is rotatably attached to the rear end portions of the left and right guide members 2a, 2a of the entry side guide 2 of the finishing stand 3 via joint pins 11, and the turning guide is provided.
Press the 12 with a specified pressing force to the side of the strip material 1 to the hydraulic cylinder
By making contact with 13 and detecting the amount of movement of the turning guide 12 by a sensor, it is possible to detect the meandering amount and the meandering direction of the strip material 1 from the detection signal of the sensor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip meandering detection device.

[0002]

2. Description of the Related Art Conventionally, in a hot tandem rolling mill used as a finishing rolling mill of a hot rolling facility, a strip material 1 is guided by an inlet side guide 2 and a finishing stand 3 as shown in FIG. During rolling, meandering of the strip material 1 during rolling is generally detected by a meandering sensor 4 (see, for example, Japanese Patent Laid-Open No. 2-89514).

As the meandering sensor 4, two types of non-contact type optical sensors are mainly used. That is, as one of them, as shown in FIG. 5, a width sensor 5 is provided in which a light emitting device 5a extending over the entire width is provided below the pass line and a light receiving device 5b provided above the pass line detects the amount of light emitted according to the plate width. The other is, as shown in FIG. 6, edge sensors 6 and 6 having both a two-dimensional laser beam emitting device and a light receiving device.
Is arranged above the pass line at two places, the drive side and the operator side, and the meandering amount is obtained by detecting the plate end portions on both sides.

[0004]

However, the width sensor 5 and the edge sensor 6 used as the meandering sensor 4 described above have the following problems. As described above, since the inlet side guide 2 and the wiper (not shown) are attached to the inlet and outlet sides of the hot tandem rolling mill, the width sensor 5 and the edge sensor 6 are newly added to such existing equipment. It is difficult to secure the space required for the installation. Therefore, if you try to secure a new installation space, it will cost a lot of money to modify it. On the inlet and outlet sides of the hot tandem rolling mill, there is a large amount of coolant water used for cooling the strip material 1 and the rolling rolls,
Since it is a bad environment in which vapor, dust, etc. can enter due to it, if you try to use the above optical sensor, even if you apply air purge, it will not be a sufficient countermeasure, and water,
It is inevitable that the measurement accuracy and the reliability of the measured values will deteriorate due to changes in the refractive index due to vapor and dirt on the lens.

The present invention has been made in order to solve the problems of the prior art as described above, and an object of the present invention is to provide a meandering detection device for a strip material which is simple and has high measurement accuracy.

[0006]

SUMMARY OF THE INVENTION The present invention is an apparatus for detecting meandering when a strip material is rolled by a hot tandem rolling mill, which is provided on the inlet side or the outlet side of the hot tandem rolling mill. Of the left and right guide members of the side guides, which are rotatably attached to the rear ends of the left and right guide members, respectively, a hydraulic cylinder for bringing the roll guides into contact with the side surface of the strip material by a predetermined pressing force, and the roll guides. A meandering detection device for a strip material, comprising: a sensor for detecting a movement amount; and an arithmetic processing device for detecting a meandering amount and a meandering direction of the strip material from a detection signal of the sensor.

[0007]

[Operation] According to the present invention, the turning guides are attached to the rear end portions of the left and right guide members of the side guides, and the amount of movement until contact with the side surface of the strip is detected by the sensor, and the difference in the amount of movement is detected. Since the meandering amount of the strip material is calculated from the above, the meandering amount can be measured with high accuracy without being affected by a bad environment such as water, steam or dust.

[0008]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows the overall configuration of the meandering detection device of the present invention. As shown in the drawing, the meandering detection device 10 of the present invention is attached to the rear end portions of the pair of guide members 2a, 2a of the entrance side guide 2 and is rotatable in the direction of the arrow through the respective joint pins 11. The guide 12 and a hydraulic cylinder 13 that drives the turning guide 12 are mainly configured.

FIG. 2 is an enlarged view of a main part of the one meandering detection device 10. Hydraulic cylinder as shown
The end of 13 is rotatably connected to a fixed metal piece 14 provided on the guide member 2a via a connecting pin 15, and its rod 16 is attached to a fixed pin 17 attached to the upper surface of the turning guide 12. To the arm 18 via a connecting pin 19.

Pressure oil from the oil supply pipe 20 is supplied to the hydraulic cylinder 13 via an oil amount sensor 21 and a pressure guiding pipe 22. The oil amount sensor 21 is made compatible with forward flow and reverse flow, the signal detected thereby is input to the arithmetic processing unit 23, and the processing result is displayed on the display unit 24. Further, a touch roller 25 is attached to the end of the turning guide 12 so as to be in contact with the side surface of the strip material 1. As a result, it is possible to prevent contact flaws from being formed on the side surface of the strip material 1.

The operation of the meandering detection device 10 of the present invention thus constructed will be described below. The gap between the guide members 2a, 2a of the entrance side guide 2 is set with a slight margin α (α is usually 20 to 30 mm) depending on the strip width of the strip material 1 to be rolled. At this time, the turning guide 12 is in a position parallel to the guide members 2a, 2a. When the strip material 1 enters the entrance side guide 2, pressure oil is sent to the hydraulic cylinder 13 via the oil amount sensor 21 to be operated, and the turning guides 12 on the drive side and the operator side are turned to rotate the touch roller. 25 is brought into contact with the side surface of the strip material 1 with a predetermined pressing force.

The hydraulic pressure P (MPa) at this time is the strip material.
In order to prevent squeezing (narrowing down) at the tail end of 1, the following (1)
It shall be set by an expression. P <(4F / πD²) ・ (A₂/ A₁) ……………… (1) Where, F: When restraining the strip material 1 that slides sideways
Required force (thrust force: N), D; hydraulic cylinder 13
Inner diameter of head side (mm), A₁; Length of arm 18 (mm),
A₂; Distance between fixing pin 17 and touch roller 25 (mm)
Is. In addition, the value of thrust force F is for the latter stage stand.
As the plate thickness decreases, the thickness decreases. At this time, the turning guide 12 is
Strike from the initial state (parallel to the guide members 2a, 2a)
Drive drive by the time it is pressed against the top material 1.
Id and the hydraulic cylinder 13 on the operator side
Oil quantity Q₁, Q ₂Are measured respectively. Then, in the arithmetic processing unit 23, the following (2), (3)
Drive side and operator side
Id 12 movement amount L₁, L₂Ask for.

L ₁ = (4Q ₁ / πD ² ) ・ (A ₂ / A ₁ ) ... (2) L ₂ = (4Q ₂ / πD ² ) ・ (A ₂ / A ₁ ) ... (3) Next, the difference ΔL in the amount of movement of the turning guide 12 on the drive side and the operator side is calculated by the following equation (4). ΔL = L ₁ −L ₂ (4) Further, based on the value of ΔL, the presence or absence of the meandering of the strip material 1, the degree of meandering and the direction thereof are determined as follows,
The result is displayed on the display device 24.

If ΔL = 0, there is no meandering.・ If ΔL> 0, it meanders toward the drive side by ΔL.・ If ΔL <0, it meanders to the operator side by | ΔL |. FIG. 3 shows a value obtained by measuring the meandering amount of the strip material 1 by using the meandering detection device 10 of the present invention in comparison with a value measured by a conventional optical meandering sensor arranged on the exit side of the finishing stand. Is. The measured value of the optical meandering sensor is measured by temporarily stopping the coolant water on the outlet side in order to improve the accuracy. As is clear from the figure, both measured values are in good agreement, and it can be seen that the measurement accuracy of the device of the present invention is excellent.

In the above embodiment, the meandering detection device
I explained that 10 is attached to the entrance side guide 2, but
The present invention is not limited to this, and even if it is attached to the exit side guide, the same operational effect is obtained. The meandering amount may be detected by any type other than the oil amount sensor 21 as long as it can detect the moving position of the turning guide 12.

[0016]

As described above, according to the present invention,
By attaching a turning guide to the rear ends of the left and right guide members of the side guides and detecting the mechanical movement amount until contacting the side surface of the strip with a sensor, the meandering amount of the strip material can be accurately determined. Since it can be measured, it is possible to take appropriate action for preventing meandering, which can contribute to the improvement of the quality and yield of the strip material.

[Brief description of drawings]

FIG. 1 is a plan view showing an overall configuration of a meandering detection device of the present invention.

FIG. 2 is an enlarged plan view showing a main part of the meandering detection device of the present invention.

FIG. 3 is a characteristic diagram showing a comparison between measured values of the meandering detection device of the present invention and measured values of a conventional optical meandering sensor.

FIG. 4 is a side view showing a conventional example.

FIG. 5 is a front view showing an example of a conventional meandering sensor.

FIG. 6 is a front view showing another example of the conventional meandering sensor.

[Explanation of symbols]

 1 strip material 2 inlet side guide 2a guide member 3 finishing stand 10 meandering detection device 11 joining pin 12 turning guide 13 hydraulic cylinder 18 arm 20 oil supply pipe 21 oil amount sensor 22 pressure pipe 23 arithmetic processing device 24 display device 25 touch roller

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B21B 37/68

Claims (1)

[Claims] 1. A device for detecting meandering when a strip material is rolled by a hot tandem rolling mill, which comprises right and left guide members of a side guide provided on an inlet side or an outlet side of the hot tandem rolling mill. A turning guide that is rotatably attached to each of the rear end portions via joining pins, a hydraulic cylinder that makes the turning guide contact the side surface of the strip material with a predetermined pressing force, and a sensor that detects the amount of movement of the turning guide. A meandering detection device for a strip material, which comprises an arithmetic processing device for detecting the meandering amount and the meandering direction of the strip material from a detection signal of the sensor.