JPH07239223A - Flatness measuring device for rolled plate - Google Patents

Abstract

PURPOSE:To provide a flatness measuring device for rolled plate which is capable of accurately measuring the flatness of rolled plate tensed between an upstream roller and a down stream roller. CONSTITUTION:On a rolled plate 5 passing between an upstream roller 6a and a downstream roller 6b, a displacement roll 2 with a constant pressure is pushed. The displacement roll 2 with a constant pressure partly displaces so that the tension of the rolled plate 5 becomes approximately uniform in the width direction. The displacement of the displacement roll 2 with a constant pressure is measured with an optical displacement meter 1 and based on the measured value from the optical displacement meter 1, the flatness of the rolled plate 5 is obtained with an arithmetic means 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flatness measuring device for a rolled plate, and more particularly to a flatness measuring device capable of accurately measuring flatness.

[0002]

2. Description of the Related Art When a rolled plate has no tension, the flatness can be measured by measuring the uneven shape of the rolled plate with a displacement meter. A device shown in FIG. 16 is considered as a device for measuring the flatness of a rolled plate using a displacement meter. The apparatus shown in FIG. 16 measures the distance to the rolled plate 5 by an optical displacement meter 1 using a triangulation method or an optical cutting method, and obtains the unevenness of the rolled plate 5 by the optical displacement meter 1 to determine the unevenness of the rolled plate. To measure the flatness.

[0003]

By the way, when tension is applied to the rolling plate between the upstream and downstream rolling rolls, as shown in FIG. 17, the rolling plate 5 stretches and the shape becomes flat. In this state, it is difficult to measure the flatness of the rolled plate 5 only by measuring the distance by the optical displacement meter 1.

The present invention has been made in consideration of such a point, and the flatness of a rolled plate can be surely measured even when the rolled plate is under tension. An object is to provide a degree measuring device.

[0005]

The invention according to claim 1 is
A constant pressure displacement roll that is pressed against a rolling plate that passes between the upstream rolling roll and the downstream rolling roll and is partially displaced so that the rolling plate tensions are approximately the same in the width direction, and this constant pressure displacement roll. The flatness of the rolled plate characterized by comprising a displacement meter for measuring the displacement of the rolled plate over the width direction of the rolled plate, and a calculation means for calculating the flatness of the rolled plate based on the measurement value from the displacement meter. It is a measuring device.

According to a third aspect of the present invention, the displacement roll is pressed against the rolling plate passing between the upstream side rolling roll and the downstream side rolling roll, and is partially displaced by the same displacement amount for the same pressing force. And a displacement meter that measures the displacement of the displacement roll across the width of the rolled plate, and the flatness of the rolled plate is calculated by obtaining the distribution in the width direction of the tension of the rolled plate based on the measurement value from this displacement meter. An apparatus for measuring flatness of a rolled plate, comprising: an arithmetic means.

According to a sixth aspect of the present invention, the pressure variable roll is pressed against the rolling plate passing between the upstream rolling roll and the downstream rolling roll, and the pressure variable roll is pressed against the rolling plate. An actuator that flattens the rolled plate in the width direction, a measuring device that measures the pressing force of the pressure variable roll by the actuator over the width direction of the rolled plate, and the tension of the rolled plate based on the measurement value from this measuring device. And a calculation unit that calculates the flatness of the rolled plate by obtaining the distribution in the width direction of the rolled plate.

[0008]

According to the first aspect of the invention, when the constant pressure displacement roll is pressed against the rolling plate, the constant pressure displacement roll is partially displaced so that the tension of the rolling plate becomes substantially the same in the width direction. The displacement amount of the constant pressure displacement roll is measured by a displacement meter along the width direction of the rolling plate, and the flatness of the rolling plate is calculated by the calculating means based on the displacement amount of the constant pressure displacement roll measured by the displacement meter.

According to the third aspect of the invention, when the displacement roll is pressed against the rolling plate, the displacement roll is partially displaced by the same displacement amount with respect to the same pressing force over the width direction of the rolling plate. The displacement amount of the displacement roll is measured by the displacement meter along the width direction of the rolling plate, and the distribution of the tension of the rolling plate in the width direction and the flatness are obtained by the calculating means based on the displacement amount of the displacement roll by the displacement meter.

According to the sixth aspect of the invention, the pressure variable roll is pressed against the rolling plate by the actuator so as to flatten the rolling plate, and the pressing force of the pressure variable roll is measured by the measuring device in the width direction of the rolling plate. To be measured. Based on the pressing force of the pressure variable roll by this measuring device, the distribution and the flatness of the rolling plate tension in the width direction are obtained by the calculating means.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are views showing a first embodiment of a flatness measuring apparatus for rolled plates according to the present invention.

As shown in FIG. 1, the flatness measuring apparatus comprises a constant pressure displacement roll 2 pressed against a rolling plate 5 passing between an upstream rolling roll 6a and a downstream rolling roll 6b.
Is equipped with. The constant pressure displacement roll 2 is a rolling plate 5
The tension can be displaced so as to be uniform along the width direction.

An optical displacement meter 1 for measuring the displacement of the rolling plate 5 in contact with the constant pressure displacing roll 2 in the width direction of the rolling plate 5 is provided above the constant pressure displacing roll 2.
The optical displacement meter 1 is connected with a calculation means 10 for calculating the flatness of the rolled material 5 based on the measurement value from the optical displacement meter 1.

Next, the constant pressure displacement roll 2 will be described with reference to FIG. Of these, FIG. 2 (a) is a sectional view of the constant pressure displacement roll cut along a plane perpendicular to the roll axis, and FIG. 2 (b) is a sectional view of the constant pressure displacement roll cut along a plane parallel to the roll axis. FIG.

The constant pressure displacement roll 2 includes a roll shaft 2c,
A plurality of hollow split rolls 2A, 2A, ..., Which are arranged on the outer periphery of the roll shaft 2c and are split in the width direction of the rolling plate 5, are provided, and each split roll 2A, 2A.
It is supported by B, ... The roll shaft 2c has a cylinder chamber 2 at a position corresponding to each piston 2B, 2B, ....
, Are formed, and the pistons 2B, 2B, ... Are slidably accommodated in the cylinder chambers 2D, 2D ,. The cylinder chambers 2D, 2D, ... Are connected by the oil passage hole 11, and the cylinder chambers 2D, 2D, ... Are filled with oil.

The cross-sectional areas of the cylinder chambers 2D, 2D ... Are equal, and therefore the pistons 2B, 2B, ... Inside the cylinder chambers 2D, 2D ,. While being displaced, it comes into contact with the rolling plate 5 with a uniform contact pressure.

Next, the operation of this embodiment having such a configuration will be described. As shown in FIG. 1, the rolling plate 5 passing between the upstream rolling roll 6a and the downstream rolling roll 6b is
The constant pressure displacement roll 2 bends upward in a mountain shape.
In this case, since tension is generated in the rolling plate 5 from the upstream and downstream rolling rolls 6a and 6b, the pressure constant displacement roll 2
A force is applied downward from the rolling plate 5. In this case, the divided rolls 2A, 2A, ... Of the constant pressure displacement roll 2 come into contact with the rolling plate 5 with the same contact force while being displaced, so that the rolling plate pressed against the constant pressure displacement roll 2 has a tension distribution in the width direction thereof. Be uniform. At this time, when the rolled plate 5 is not flat, the unevenness of the rolled plate 5 appears on the constant pressure displacement roll 2. For example, in the case of an abdominal extension (the center portion of the rolled plate extends more than the end portion), the rolled plate 5 is moved by the optical displacement meter 1.
The central part of is measured convexly.

Next, in the calculating means 10, when the constant pressure displacement roll 2 is located at the center between the upstream and downstream rolling rolls 6a and 6b, the upstream and downstream rolling rolls 6 are
The distance between a and 6b is D, the bending height of the end of the rolled plate 5 by the constant pressure displacement roll 2 is H, and the difference in height from the end of the central part of the rolled plate 5 is ΔH. Length L0 between the constant pressure roll 2 and the downstream rolling roll 6b
And the length L1 of the central part is

[0019]

[Equation 1] The elongation rate ε is calculated by ε = (L1−L0) / L0 (3). And this elongation rate becomes flatness.

According to this embodiment, the upstream rolling roll 6a
Even when tension is applied to the rolled plate 5 between the rolling plate 5 and the downstream rolling roll 6b, the flatness of the rolled plate 5 can be easily and reliably measured.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment shown in FIGS. 1 and 2 are designated by the same reference numerals and detailed description thereof will be omitted.

Of these, FIG. 3A is a view of the constant pressure displacement roll viewed from the side of the rolling plate, and FIG. 3B is a view of the constant pressure displacement roll viewed from the flow direction of the rolling plate. In FIGS. 3A and 3B, the constant pressure displacement roll 2 includes a plurality of hollow split rolls 2 divided in the width direction of the rolling plate 5.
A, 2A, ...

Each of the divided rolls 2A, 2A, ... Is supported by an independent arm 2E, 2E, .., and each arm 2E is swingably attached to an arm shaft 2F. Further, the arm 2E is restrained by a wire or tune 2G attached to the end portion on the side opposite to the split roll 2A. Wire 2G is connected to all arms 2E, 2E, through pulley 2H.
, So that each split roll 2A comes into contact with the rolling plate 5 with a uniform contact pressure while being displaced. During this period, the optical displacement meter 1 obtains the displacement of the split roll 2A by measuring the displacement of the arm 2E.

The signal from the optical displacement meter 1 is sent to the calculating means 10, and the calculating means 10 obtains the flatness of the rolled plate 5 as in the first embodiment.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 4, the flatness measuring device for a rolled plate has a hollow elastic displacement roll 3 pressed against a rolled plate 5 passing between an upstream rolling roll 6a and a downstream rolling roll 6b. Is equipped with. This elastic displacement roll 3
It has a uniform elastic coefficient along the width direction of the rolled plate 5, and is elastically deformed according to the tension of the rolled plate 5.

Further, as shown in FIG. 6, the elastic displacement roll 3
A plurality of mirrors 1A, 1A, ... Are arranged in the internal space 13 of the rolling plate 5 along the width direction thereof.
By irradiating A, ... With light from the optical displacement meter 1, the displacement of the measuring portion 12 of the elastic displacement roll 3 is measured. 6A is a sectional view of the elastic displacement roll cut along a plane perpendicular to the axis, and FIG. 6B is a sectional view of the elastic displacement roll cut along a plane parallel to the axis. Then, the signal from the optical displacement meter 1 is input to the calculating means 10.

Next, the operation of this embodiment having such a configuration will be described. As shown in FIG. 4, the rolling plate 5 passing between the upstream rolling roll 6a and the downstream rolling roll 6b.
Is bent upward by the elastic displacement roll 3.
Since the tension T is generated on the rolling plate 5, a downward force is applied to the elastic displacement roll 3. When the rolled plate 5 is not flat, the tension of the rolled plate 5 varies in the width direction, and thus the stress applied to the elastic displacement roll 3 varies in the width direction.
Therefore, the elastic displacement roll 3 is partially elastically displaced according to the distribution of the tension of the rolling plate 5.

As shown in FIG. 4, when the bending angle of the rolled plate 5 is α, the tension of the rolled plate is T, the elastic displacement coefficient of the elastic displacement roll 3 is k, and the displacement of the elastic displacement roll 3 is ΔH, the displacement is The tension T is But it can be stopped. The distribution of the displacement ΔH is measured by the optical displacement meter 1, and the distribution of the tension T is obtained by the calculating means 10 as described later.

Next, the displacement measurement of the elastic displacement roll 3 by the optical displacement meter 1 will be described with reference to FIG. The measuring portion 12 of the elastic displacement roll 3 has a thin structure. The elastic displacement roll 3 receives the stress when the measurement portion 12 contacts the rolling plate 5, and is elastically displaced. This displacement is measured from the inside by an optical displacement meter 1
The non-contact displacement measurement and the displacement measurement excellent in heat resistance can be performed by performing the measurement. That is,
By making the hollow elastic displacement roll 3 sufficiently longer than the width of the rolling plate 5 so that the portion of the elastic displacement roll 3 in which the optical displacement meter 1 is built-in can be cooled, a measuring device excellent in heat resistance can be obtained. Can be provided.

The optical displacement meter 1 measures the displacement of the measuring portion 12 via the mirror 1A, and the output of the optical displacement meter 1 is output to the calculating means 10 through a coupling such as a slip ring.

FIG. 7 shows the relationship between the rotation of the elastic displacement roll 3 and the value measured by the optical displacement meter 1. Since the measurement portion 12 of the roll 3 comes into contact with the rolling plate 5 once per one rotation of the roll 3, the displacement of the elastic displacement roll 3 can be measured once per one rotation.

Further, by using an optical interference displacement gauge or the like for the optical displacement gauge 1, it is possible to perform highly accurate displacement measurement, so the displacement of the elastic displacement roll due to stress may be small.

Next, in the calculating means 10, the flatness of the rolled plate 5 is quantified by the elongation of the rolled plate. here,
The elongation percentage is a difference in elongation per unit length when it is assumed that the rolled plate 5 is cut into strips in the longitudinal direction as shown in FIG. 5 (a). In practice, it is not possible to cut the rolled plate 5 into strips, so as shown in FIG. 5 (b), tension is generated in the rolled plate and elastically deforms, so that the tension when the plate is apparently flat is obtained. The distribution will be measured.

[0035] However, L: reference length, ΔL: difference in elongation, E: Young's modulus, ΔT: difference in width direction of tension.

In this way, the displacement of the elastic displacement roll 3 is measured by the optical displacement meter 1, and the calculating means 10 calculates the equation (4).
By calculating (5), the flatness, that is, the elongation rate can be obtained.

Fourth Embodiment Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment shown in FIG. 8 is one in which the optical displacement meter 1 located in the internal space 13 of the elastic displacement roll 3 is arranged above the elastic displacement roll 3, and the others are shown in FIGS. It is substantially the same as the third embodiment shown.

Of these, FIG. 8A is a sectional view of the elastic displacement roll 3 taken along a plane perpendicular to the axis.
(B) is a sectional view of the elastic displacement roll 3 taken along a plane parallel to the axis.

As shown in FIGS. 8 (a) and 8 (b), two internal spaces 13, 13 are provided so as to penetrate through the elastic displacement roll 3, and the optical displacement meter 1 is provided above the elastic displacement roll 3. Are arranged. The displacement of the elastic displacement roll 3 is measured by the optical displacement meter 1 via the rolling plate 5.

Fifth Embodiment Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG. The fifth embodiment shown in FIG. 9 is different from the third embodiment shown in FIGS. 4 to 7 only in the structure of the displacement roll.

9 (a) is a sectional view of the displacement roll cut along a plane perpendicular to the axis, and FIG. 9 (b) is a sectional view of the displacement roll cut along a plane parallel to the axis. Is.

As shown in FIGS. 9 (a) and 9 (b), the displacement roll 15 includes a roll shaft 15C and a plurality of hollow split rolls 15A arranged on the outer periphery of the roll shaft 15C and divided in the width direction of the rolling plate 5. Each of the divided rolls 15A is supported by a roll shaft 15C via a spring 15B.

Since each of the divided rolls 15A is made of a relatively rigid material and is supported by the roll shaft 15C via the spring 15B, the pressing force from the rolling plate 5 causes the roll shaft 15C to move up and down. It will be displaced in the direction. Further, the thin portion of each divided roll 15A serves as the measurement portion 12. In the inner space 16 of the displacement roll 15, along the width direction of the rolling plate 5, a plurality of mirrors 1A, 1A,
... and the optical displacement meter 1 are provided, and the mirrors 1A, 1
By irradiating A, ... With light from the optical displacement meter 1, the displacement of the measurement portion 12 of each displacement roll 15 is measured.

Each of the split rolls 15A has a spring 1 of the same shape.
5 and therefore each split roll 15A
When the pressing force from the rolling plate 5 is the same, the plates are displaced by the same displacement amount.

The signal from the optical displacement meter 1 is sent to the computing means 10 via a coupling such as a slip ring,
The calculation means 10 calculates the tension distribution and flatness of the rolled plate 5 based on the equations (4) and (5).

Sixth Embodiment Hereinafter, a sixth embodiment of the present invention will be described with reference to FIG. The sixth embodiment shown in FIG. 10 is one in which the optical displacement meter 1 arranged in the internal space 16 of the displacement roll 15 is arranged above the displacement roll 15, and the other is the fifth embodiment shown in FIG.
The embodiment is substantially the same as the embodiment.

Here, FIG. 10A is a sectional view of the displacement roll 15 taken along a plane perpendicular to the axis.
(B) is a sectional view of the displacement roll 15 taken along a plane parallel to the axis.

As shown in FIGS. 10 (a) and 10 (b), the optical displacement meter 1 is arranged above the displacement roll 15 and each of the division rolls 15A constituting the displacement roll 15 is constituted by the optical displacement meter 1.
Is measured via the rolling plate 5.

Seventh Embodiment Hereinafter, a seventh embodiment of the present invention will be described with reference to FIG. The seventh embodiment shown in FIG. 11 is one in which the optical displacement meter 1 arranged in the internal space 16 of the displacement roll 15 is arranged below the displacement roll 15, and the other is the fifth embodiment shown in FIG.
The embodiment is substantially the same as the embodiment.

Here, FIG. 11A is a sectional view of the displacement roll 15 taken along a plane perpendicular to the axis.
(B) is a sectional view of the displacement roll 15 taken along a plane parallel to the axis.

As shown in FIGS. 11 (a) and 11 (b), the optical displacement meter 1 is arranged below the displacement roll 15, and each of the division rolls 15A constituting the displacement roll 15 is constituted by the optical displacement meter 1.
The displacement of is measured.

In this case, the displacement of each divided roll 15A can be directly measured by the optical displacement meter 1.

Eighth Embodiment Hereinafter, the eighth embodiment of the present invention will be described with reference to FIG. Here, FIG. 12A is a sectional view of the displacement roll taken along a plane perpendicular to the axis, and FIG. 12B is a sectional view of the displacement roll taken along a plane parallel to the axis.

In FIGS. 12A and 12B, the flatness measuring device is equipped with a displacement roll 15 pressed against the rolling plate 5, and the displacement roll 15 is divided into a plurality of divided rolls 5 in the width direction. It has a dividing roll 15A. Each of the dividing rolls 15A is made of a relatively rigid material, and each of the dividing rolls 15A is made of an elastic arm 15 made of an elastic material.
Supported by D. Therefore, each divided roll 15A
Are displaced in the vertical direction by the pressing force from the rolling plate 5.

Since each elastic arm 15D has the same shape and material, each split roll 15A is displaced by the same displacement amount when the pressing force from the rolling plate 5 is the same.

An optical displacement meter 1 for measuring the displacement of each divided roll 15A via the rolling plate 5 is arranged above the displacement roll 15. The signal from the optical displacement meter 1 is sent to the calculating means 10, and in this calculating means 10, (4) and (5)
The tension distribution and flatness of the rolled plate 5 are obtained based on the equation.

Ninth Embodiment Hereinafter, a ninth embodiment of the present invention will be described with reference to FIG. The ninth embodiment shown in FIG. 13 is a displacement roll 15
The optical displacement meter 1 arranged above is arranged below the displacement roll 15, and other parts are substantially the same as those of the eighth embodiment shown in FIG.

Here, FIG. 13A is a sectional view of the displacement roll 15 taken along a plane perpendicular to the axis.
(B) is a sectional view of the displacement roll 15 taken along a plane parallel to the axis.

As shown in FIGS. 13A and 13B, the optical displacement meter 1 is arranged below the displacement roll 15, and the displacement of each divided roll 15A is measured by the optical displacement meter 1. In this case, the displacement of each divided roll 15A can be directly measured by the optical displacement meter 1.

Tenth Embodiment The tenth embodiment of the present invention will be described below with reference to FIG. The tenth embodiment shown in FIG. 14 is an optical displacement meter 1
Is arranged below each elastic arm 15A, and other parts are substantially the same as those of the eighth embodiment shown in FIG.

Here, FIG. 14A (a) is a sectional view of the displacement roll 15 taken along a plane perpendicular to the axis.
(B) is a cross-sectional view of the displacement roll 15 taken along a plane parallel to the axis.

As shown in FIGS. 14A and 14B, the optical displacement meter 1 is arranged below the elastic arm 15A, and the displacement of the elastic arm 15D, that is, the displacement of each divided roll 15A is caused by the optical displacement meter 1. To be measured. In this case, since the elastic arm 15D does not rotate, the elastic arm 1D
The space including the 5D and the optical displacement meter 1 can be hermetically sealed to perform highly accurate displacement measurement.

Eleventh Embodiment Hereinafter, the eleventh embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 15, the flatness measuring device for a rolled plate is provided with a pressure variable roll 17 pressed against the rolled plate 5, and the pressure variable rolls 17 are divided into a plurality of parts in the width direction of the rolled plate 5. Each of the split rolls 17A is made of a relatively rigid material and is supported by an arm 17B. Each arm 17B is connected to an actuator 17D via a load cell 17C, and each divided roll 17A is pressed against the rolling plate 5 by the actuator 17D.

An optical displacement meter 1 for measuring the displacement of the rolling plate 5 in the width direction is arranged above the pressure variable roll 17, and the optical displacement meter 1 is connected to a calculating means 10. . In addition, each load cell 1 is included in the computing means 10.
5C and each actuator 17D are connected.

Next, the operation of this embodiment having such a configuration will be described. First, the rolling plate 5 is moved by the optical displacement meter 1.
Displacement (irregularities) of the
The signal from is input to the calculation means 10.

Then, the actuator 17D is driven by the calculating means 10 to adjust (flatten) the displacement of the rolling plate 5 so as to be uniform in the width direction. At this time, each load cell 17C measures the pressing force of each divided roll 17A against the rolling plate 5, and the signal from each load cell 17C is input to the computing means 10. The calculation means 10 calculates the tension distribution and flatness of the rolled plate 5 based on the above equations (4) and (5).

According to this embodiment, the rolling plate 5 is flattened so that the displacement thereof is uniform in the width direction.
With 7C, the pressing force of each divided roll 17A can be accurately measured.

[0069]

As described above, according to the first aspect of the invention, the flatness of the rolling plate to which the tension is applied can be accurately obtained based on the displacement amount of the constant pressure change roll by the displacement gauge. .

According to the third aspect of the present invention, the widthwise distribution of tension and the flatness of the rolling plate to which tension is applied can be accurately obtained based on the displacement amount of the displacement roll by the displacement gauge.

According to the sixth aspect of the invention, it is possible to accurately obtain the widthwise distribution and the flatness of the tension of the rolled plate to which the tension is applied, based on the pressing force of the pressure variable roll by the measuring device.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a flatness measuring device for a rolled plate according to the present invention.

FIG. 2 is a configuration diagram showing a constant pressure displacement roll of the first embodiment.

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a third embodiment of the present invention.

FIG. 5 is a diagram showing the definition of flatness.

FIG. 6 is a configuration diagram showing an elastic displacement roll.

FIG. 7 is a diagram showing the relationship between roll rotation and measurement distance (displacement).

FIG. 8 is a diagram showing a fourth embodiment of the present invention.

FIG. 9 is a diagram showing a fifth embodiment of the present invention.

FIG. 10 is a diagram showing a sixth embodiment of the present invention.

FIG. 11 is a diagram showing a seventh embodiment of the present invention.

FIG. 12 is a diagram showing an eighth embodiment of the present invention.

FIG. 13 is a diagram showing a ninth embodiment of the present invention.

FIG. 14 is a diagram showing a tenth embodiment of the present invention.

FIG. 15 is a diagram showing an eleventh embodiment of the present invention.

FIG. 16 is a configuration diagram of a conventional flatness measuring device.

FIG. 17 is a diagram showing a problem of the conventional device.

[Explanation of symbols]

 1 Displacement meter 1A Mirror 2 Constant stress displacement roll 2A Divided roll 2B Piston 2C Roll axis 2D Cylinder chamber 2E Arm 2F Arm axis 2G Wire 2H Pulley 3 Elastic displacement roll 5 Rolling plate 6a, 6b Rolling roll 10 Computation means 15 Displacement roll 15A Split Roll 15B Spring 15C Roll shaft 15D Elastic arm 17 Pressure variable roll 17A Divided roll 17B Arm 17C Load cell 17D Actuator

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area G01B 11/06 Z

Claims (6)

[Claims] 1. A constant pressure displacing roll which is pressed against a rolling plate passing between an upstream rolling roll and a downstream rolling roll and is partially displaced so that the rolling plate tension becomes substantially the same in the width direction. Displacement for measuring the displacement of the constant pressure displacement roll across the width of the rolling plate, and a calculating means for calculating the flatness of the rolling plate based on the measurement value from the displacement meter. Flatness measuring device for rolled plate. 2. The rolling plate according to claim 1, wherein the constant pressure displacement roll is divided into a plurality of parts in the width direction of the rolling plate, and each part contacts the rolling plate with substantially the same contact pressure. Flatness measuring device. 3. A displacement roll which is pressed against a rolling plate passing between an upstream side rolling roll and a downstream side rolling roll and which is partially displaced by the same displacement amount under the same pressing force, and a displacement roll of this displacement roll. A displacement meter that measures the displacement in the width direction of the rolled plate, and a calculation unit that calculates the flatness of the rolled plate by obtaining the widthwise distribution of the tension of the rolled plate based on the measurement value from this displacement meter are provided. An apparatus for measuring flatness of a rolled plate, characterized in that 4. The flatness measuring device for a rolled plate according to claim 3, wherein the displacement roll is made of an elastic material having the same elastic coefficient in the width direction of the rolled plate. 5. The flat plate of a rolled plate according to claim 3, wherein the displacement roll is divided into a plurality of parts in the width direction of the rolled plate, and each part is supported by an elastic support having the same elastic coefficient. Degree measuring device. 6. A pressure variable roll which is pressed against a rolling plate passing between an upstream rolling roll and a downstream rolling roll, and the pressure variable roll is pressed against the rolling plate so that the rolling plate extends in the width direction. The flattening actuator, the measuring device that measures the pressing force of the variable pressure roll by this actuator over the width direction of the rolling plate, and the width-direction distribution of the tension of the rolling plate is determined based on the measurement value from this measuring device. And a calculation means for calculating the flatness of the rolled plate.