JP2001280919A - Instrument and method for measuring plate width of rolled material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly precisely measure a true plate width while correcting a skew angle, by measuring concurrently a measured plate width of a rolled material and the skew angle using only one pair of laser range finders provided in both sides of a rolled material passing area. SOLUTION: In this measuring instrument 1, one pair of the laser range finders 3, 4 are arranged to be opposed each other in the both sides of the passing area of the rolled material S. Each of the range finders 3, 4 has a lens means 7 for bringing a laser beam into a straight beam 9 having a peak in its central part, or an optical system 7' for bringing the laser beam into three-point spot light lines 9a, 9b, 9c having peaks in three points comprising one point in the central part and two points equal in angles viewed from the central part in both sides thereof. The measured plate width X and the skew angle θ of the rolled material S are calculated by an image processor 5 based on an image detected by a detector 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for measuring the width of a rolled material, and more particularly, to an apparatus and a method for measuring the width of a rolled material suitable for measuring the width of a thick rolled material. About the method.

[0002]

2. Description of the Related Art Conventionally, in thick plate rolling, tentering rolling for obtaining a predetermined product width and finish rolling for rolling to a predetermined product thickness have been performed. In this tentering rolling, since an accurate measurement of the initial plate width before rolling (slab) of the rolled material is required, a plate width measuring method for measuring the plate width has been conventionally proposed.

As a conventional method for measuring the width of a rolled material of this type, for example, a method using a rolled material width measuring apparatus shown in FIG. 12 is known (see Japanese Patent Application Laid-Open No. 58-195112). In FIG. 12, distance meters 102 and 103 such as an optical distance meter using a pair of He-Ne lasers are predetermined on both sides of a passing area of a rolled material (slab) S conveyed by a table roller 101. They are arranged facing each other at a distance La. Each of the distance meters 102 and 103 can measure each distance L1 and L2 with respect to the side surface of the rolled material S. The arithmetic unit 105 can calculate the measured plate width X of the rolled material S by the following equation (1).

[0004]

(Equation 1)

[0005] Also, one side (see FIG.
On the right side of the figure, a pair of distance meters 103 and 104 are juxtaposed at a distance Lb. The distance meter 103 can measure the distance L2 to the side surface of the rolled material S as described above, and the distance meter 104 can measure the distance L3 to the side surface of the rolled material S. The computing unit 105 can calculate the skew angle θ of the rolled material S by the following equation (2).

[0006]

(Equation 2)

Further, based on the measured plate width X and the skew angle θ of the rolled material S, the arithmetic unit 105 calculates the following equation (3).
The true width W of the rolled material S can be calculated.

[0008]

(Equation 3)

According to the method for measuring the width of a rolled material, an error based on the skew angle of the measured width of the rolled material is corrected, and the true width of the material can be accurately calculated.

[0010]

However, according to this conventional method for measuring the width of a rolled material, a pair of distance meters 103 and 104 are juxtaposed at a distance Lb on one side of the threaded region of the rolled material S. Therefore, the range for installing the rangefinders 103 and 104 is widened, and a pair of light sources such as lasers is required, and the number of parts is large. For this reason, it is disadvantageous for installation in a place where space is not available, and there is a problem that even if installation is possible, the management area for disaster prevention is widened. In addition, there is a problem that the skew angle θ cannot be calculated unless the rolled material S is applied to both of the pair of distance meters 103 and 104.

Accordingly, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a laser range finder having only one pair installed on both sides of a sheet passing region of a rolled material.
By simultaneously measuring the plate width and skew angle of the rolled material,
It is an object of the present invention to provide an apparatus and a method for measuring a strip width of a rolled material which can accurately measure a true strip width while correcting a skew angle.

[0012]

In order to solve the above-mentioned problems, a strip width measuring apparatus for a rolled material according to a first aspect of the present invention comprises a pair of laser distance meters on both sides of a rolled area of a rolled material. In the apparatus for measuring the width of a rolled material that is opposed to each other, each of the laser distance meters includes a laser oscillator that outputs a laser beam, and an intensity distribution that has a peak at the center in the passing direction of the rolled material. A lens means which is spread in a fan shape to have linear light so as to have a predetermined distance from an optical axis of the linear light orthogonal to a side surface of the rolled material, and is irradiated on a side surface of the rolled material. A detector that detects an image based on the reflected light of the linear light, and an image processing apparatus that calculates a measurement plate width and a skew angle of the rolled material based on the image detected by the detector. It is characterized by having.

According to a second aspect of the present invention, there is provided a method for measuring the width of a rolled material, wherein a pair of laser rangefinders are disposed on both sides of a rolling region of the rolled material so as to face each other. From the arrangement distance, by subtracting each measurement distance from the distance meter to the side surface of the rolled material, in the method of measuring the width of the rolled material to calculate the measured plate width of the rolled material, each of the laser distance meters is output. Laser light
The rolled material is fanned out so as to have an intensity distribution with a peak in the center in the horizontal direction through which the rolled material passes to form linear light, and an image by the reflected light of the linear light applied to the side surface of the rolled material. , Detected by a detector installed at a predetermined distance from the optical axis of the linear light perpendicular to the side surface of the rolled material, based on the image, the respective measurement distance to the side surface of the rolled material, the rolling The method is characterized in that the measurement plate width of the material and the skew angle of the rolled material are calculated.

According to a third aspect of the present invention, in the method for measuring the width of a rolled material according to the second aspect of the present invention, the measured sheet width of the rolled material is multiplied by a cosine value of the skew angle. It is characterized in that a true plate width of the rolled material is obtained. According to a fourth aspect of the present invention, in the method for measuring a width of a rolled material according to the second aspect, in the invention according to the second aspect, the rolling is performed by an apparent inclination of the linear light with respect to a horizontal reference extending in the horizontal direction in the horizontal direction. The skew angle of the material is calculated.

According to a fifth aspect of the present invention, in the method for measuring a sheet width of a rolled material according to the second aspect, a center peak position of the linear light with respect to a reference position in the image and the linear light are determined. In combination with the apportionment ratio that the central spot light separates, the measured distances to the side surfaces of the rolled material, the measured plate width of the rolled material, the skew angle of the rolled material, and the true plate of the rolled material It is characterized in that the width is calculated.

According to a sixth aspect of the present invention, there is provided an apparatus for measuring the width of a rolled material, wherein a pair of laser distance meters are disposed on both sides of a threaded region of the rolled material.
Each of the laser rangefinders has a laser oscillator that outputs laser light, and the laser light is lined up in a straight line in the horizontal direction through which the rolled material passes. An optical system having a three-point spot light train having a total of three peaks at two points, and a predetermined distance from an optical axis of the three-point spot light train orthogonal to a side surface of the rolled material; A detector for detecting an image based on the reflected light of the three-point spot light sequence applied to the side surface of the rolled material, and a measuring plate width and skew of the rolled material based on the image detected by the detector. It is characterized by having an image processing device for calculating the angle.

According to a seventh aspect of the present invention, there is provided a method for measuring the width of a rolled material, wherein a pair of laser rangefinders are opposed to each other on both sides of a threaded region of the rolled material, and the distance between the pair of laser rangefinders is set opposite to each other. From, in the method of measuring the width of the rolled material to calculate the measured plate width of the rolled material by reducing each measurement distance to the side surface of the rolled material of the distance meter, the laser output from each of the laser distance meter The light is a three-point spot light train having a total of three peaks, one at the center and two at equal angles viewed from the center on both sides thereof, which are aligned in a horizontal direction in a straight line in which the rolled material passes, An image formed by the reflected light of the three-point spot light sequence applied to the side surface of the rolled material is provided at a predetermined distance from an optical axis of the three-point spot light sequence orthogonal to the side surface of the rolled material. In the image Wherein each measurement distance relative to the side surface of the rolled material on the basis of, is characterized in that calculating said measuring plate width of the rolled material, and the skew angle of the rolled material.

According to the present invention, there is provided a method for measuring the width of a rolled material according to claim 8, wherein the measured width of the rolled material is multiplied by a cosine value of the skew angle. It is characterized in that a true plate width of the rolled material is obtained. According to a ninth aspect of the present invention, in the method for measuring the width of a rolled material according to the ninth aspect, in the image according to the seventh aspect, an apparent inclination of the three-point spot light train with respect to a horizontal reference extending in the horizontal direction is obtained by: The skew angle of the rolled material is calculated.

According to a tenth aspect of the present invention, in the method for measuring a strip width of a rolled material according to the seventh aspect, in the image, a peak position at the center of the three-point spot light train with respect to a reference position is determined. In combination with an apportioning ratio at which the center spot light divides the point spot light train, the respective measurement distances to the side surfaces of the rolled material, the measured plate width of the rolled material,
The skew angle of the rolled material and the true sheet width of the rolled material are calculated.

[0020]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a schematic plan view of an embodiment of a rolled sheet width measuring apparatus according to the present invention. FIG. 2 is an explanatory diagram of the shape of the laser light as viewed from the plane side. 3A and 3B show the intensity distribution of laser light, wherein FIG. 3A is a graph showing the intensity distribution of linear light, and FIG. 3B is a graph showing the intensity distribution of a three-point spot light sequence. 4A and 4B show the state of reflection of laser light. FIG. 4A is an explanatory view of the state of reflection of laser light as viewed from the front side, and FIG. 4B is an enlarged view of a portion indicated by an arrow b in FIG.

In FIG. 1, an apparatus 1 for measuring the width of a rolled material
Are a pair of laser rangefinders 3 and 4 on both sides of the passing area of the rolled material (slab) S conveyed by the table roller 2.
Are opposed to each other at a distance La. Laser distance meter 3,4
Each has a laser oscillator 6 for outputting a laser beam, as shown in FIG. The laser light output from the laser oscillator 6 is applied to a non-cylindrical cylindrical lens 7 (lens means) or an optical system 7 'including a diffraction grating.
In the horizontal direction (vertical direction in FIGS. 1 and 2) through which the rolled material S passes, the linear light 9 (see FIG. 3A) is spread in a fan shape so as to have an intensity distribution having a peak 9a at the center. Or a three-point spot light train 9a having a total of three peaks, one at the center and two at equal intervals A from the center (equal angles viewed from the center), which are arranged in a straight line in the horizontal direction. 9b and 9c (see FIG. 3B).
Cylindrical lens 7 that converts laser light into linear light 9
Is composed of a non-cylindrical surface, but when a simple cylindrical lens is used, it is preferable to use a filter in combination.

This linear light 9 or three-point spot light train 9
a, 9b, and 9c are applied to the side surface of the rolled material S, and an image formed by the reflected light is a linear light 9 or a three-point spot light train 9 orthogonal to the side surface of the rolled material S, as shown in FIG.
The two-dimensional detector 8 is installed so as to look down on the side surface of the rolled material S at a predetermined distance H from the optical axes a, 9b, and 9c. Each of the laser rangefinders 3 and 4 includes a laser oscillator 6, a cylindrical lens 7 or an optical system 7 'including a diffraction grating, and a two-dimensional detector 8. And a two-dimensional detector 8 of a pair of laser rangefinders 3 and 4.
Is connected to the image processing apparatus 5 as shown in FIG. The image processing device 5 measures the measurement distances L1 and L2 with respect to the side surface of the rolled material S, the measured plate width X of the rolled material S, and the obliqueness of the rolled material S in the passing direction based on the image detected by the two-dimensional detector 8. The row angle θ and the true width W of the rolled material S are calculated.

Next, the distance L measured by the image processing device 5 will be described.
1, L2, the measurement plate width X, the skew angle θ, and the true plate width W will be described with reference to FIGS. FIG. 5 is a plan view and a front view showing the relationship between the laser distance meter and the rolled material when the skew angle of the rolled material in the sheet passing direction is 0 °. 6 shows an image of linear light detected by the laser distance meter shown in FIG. 5, and FIG. 6A shows an image detected by the laser distance meter on one side (left side in FIG. 5) of the rolled material. FIG. 3B is a diagram illustrating an image detected by a laser distance meter on the other side of the rolled material. FIG. 7 shows an image of a three-point spot light train detected by the laser distance meter shown in FIG. 5, (a) shows an image detected by the laser distance meter on one side of the rolled material, and (b) FIG. 4 is a diagram showing an image detected by a laser distance meter on the other side of a rolled material. FIG.
It is the top view and front view which show the relationship between a laser distance meter and a rolled material when the skew angle in the sheet passing direction of the rolled material is not 0 degree. 9 shows an image of linear light detected by the laser distance meter shown in FIG. 8, (a) shows an image detected by the laser distance meter on one side of the rolled material, and (b) shows a rolled image. It is a figure which shows the image detected by the laser distance meter of the other side of a material. 10 shows an image of a three-point spot light train detected by the laser range finder shown in FIG. 8, and FIG. 10A shows an image detected by the laser range finder on one side of the rolled material.
(B) is a figure which shows the image detected by the laser distance meter of the other side of a rolled material. FIG. 11 is a geometric reference diagram for calculating the skew angle.

First, the calculation standard by the image processing apparatus 5 will be described. As shown in FIG. 4, when the side surface of the rolled material S is located at a reference distance L0 from the surface of the cylindrical lens 7 or the optical system 7 'including the diffraction grating. Is set as the reference side position. When the side surface of the rolled material S is at the reference side surface position, and the linear light 9 or the three-point spot light train 9a, 9b, 9c is irradiated on the side surface of the rolled material S, the linear light 9 or the three points Spot light train 9a, 9
b and 9c are reflected, and the image based on the reflected light is reflected by the two-dimensional detector 8.
Is detected by At this time, the position of the linear light 9 or the central spot light (peak) 9a of the three-point spot light trains 9a, 9b, 9c in the image is set as a reference position. The look-down angle of the two-dimensional detector 8 with respect to the optical axis at this time is η
0.

Based on the above calculation criteria, the measurement distances L1 and L2, the measurement plate width X, the skew angle θ, and the true skew angle when the skew angle in the sheet passing direction of the rolled material shown in FIG. 5 is 0 °. The method of calculating the width W of the sheet will be described. The left side of the rolled material S in FIG. 5 is at the above-described reference side position, and the right side on the opposite side is closer to the front than the reference side position, that is, the cylindrical lens 7.
Alternatively, it is shifted toward the optical system 7 'including the diffraction grating by the shift amount Lx2. The skew angle on the left side and the right side of the rolled material S is 0 °.

Here, when linear light 9 or a three-point spot light train 9a, 9b, 9c is irradiated on the left side of the rolled material S from the left laser rangefinder 3, the linear light 9 or 3
The point spot light trains 9a, 9b, 9c are reflected, and the image by the reflected light is detected by the two-dimensional detector 8 on the left. The image of the linear light 9 detected by the left detector 8 is shown in FIG.
And the images of the three-point spot light trains 9a, 9b, 9c are shown in FIG. Referring to FIG. 6A, since the skew angle on the left side of the rolled material S is 0 ° and the left side of the rolled material S is at the reference side surface position, the linear light 9 is generated at the reference position b. Overlaps with the horizontal reference c extending in the horizontal direction, and the position of the center spot light 9a coincides with the reference position b. Therefore, the apparent shift amount y11 of the center spot light 9a with respect to the reference position b is 0. FIG. 7 (a)
, The three-point spot light trains 9a, 9b, 9c are also
At the reference position b, it overlaps with the horizontal reference c extending in the horizontal direction, and the position of the central spot light 9a coincides with the reference position b. Therefore, the reference position b of the central spot light 9a
The apparent deviation y11 with respect to is zero.

On the other hand, when the right side surface of the rolled material S is irradiated with the linear light 9 or the three-point spot light train 9a, 9b, 9c from the right laser rangefinder 4, the linear light 9 or the three-point spot light is emitted. The columns 9a, 9b and 9c are reflected, and the image by the reflected light is detected by the two-dimensional detector 8 on the right. The image of the linear light detected by the right detector 8 is shown in FIG. 6B, and the images of the three-point spot light trains 9a, 9b and 9c are shown in FIG.
It is shown in (b). Referring to FIG. 6B, the rolled material S
Is 0 °, the linear light 9 is parallel to the horizontal reference c, but the right side of the rolled material S is shifted by Lx2 toward the near side from the reference side position. The position of the central spot light 9a of the linear light 9 is shifted downward by y12 from the reference position b. Referring to FIG. 7B, the three-point spot light trains 9a, 9b, and 9c are also parallel to the horizontal reference c, but are three-point spot light trains 9a, 9b, and 9c.
Of the central spot light 9a is more y than the reference position b.
It is shifted downward by twelve.

In FIG. 6A and FIG. 7A, the apparent displacement y11 is 0, but is measured by the laser rangefinder 3 on the left based on the general apparent displacement y11. A method for obtaining the measurement distance L1 to be performed will be described with reference to FIG. Assuming that the look-down angle of the two-dimensional detector 8 is η, and the amount of deviation of the side surface of the rolled material S from the reference side surface position is Lx1,
From the relationship shown in FIG. 4, the apparent shift amount y11 can be expressed as in equation (4).

[0029]

(Equation 4)

Here, since the look-down angle η of the two-dimensional detector 8 is a function related to Lx1, it is expressed by the following equation (5).

[0031]

(Equation 5)

Further, the deviation Lx1 of the side surface of the rolled material S from the reference side surface position is the difference between the measured distance L1 and the reference distance L0, and can be expressed as in equation (6).

[0033]

(Equation 6)

From the above equations (4), (5) and (6), the measurement distance L1 is obtained as in equation (7).

[0035]

(Equation 7)

On the other hand, the measurement distance L2 measured by the right laser range finder 4 is the same as the measurement distance L1 in the following (8)
It is calculated from the equations (9), (10), and (11).

[0037]

(Equation 8)

[0038]

(Equation 9)

[0039]

(Equation 10)

[0040]

[Equation 11]

Here, y12 is the apparent shift amount, Lx2
Is the shift amount of the side surface of the rolled material S from the reference side surface position, η is the angle at which the two-dimensional detector is looked down, and L0 is the reference distance. Furthermore,
The measurement plate width X of the rolled material S is a pair of laser distance meters 3, 4
Is calculated by subtracting the respective measurement distances L1 and L2 of the distance meters 3 and 4 from the side surface of the rolled material S from the opposed arrangement distance La, and is obtained according to the aforementioned equation (1).

When the skew angle in the passing direction of the rolled material S is 0 °, the true width W of the rolled material S is equal to the measured width X, and the measured width X is the true width. W. next,
A method of calculating the measurement distances L1 and L2, the measurement plate width X, the skew angle θ, and the true plate width W when the skew angle in the sheet passing direction of the rolled material shown in FIG. 8 is not 0 ° will be described.

The rolled material S in FIG. 8 is inclined with respect to the sheet passing direction at oblique angles of θ1 and θ2 on the left side and the right side, and its left side is shifted to the near side from the reference side position. L
The right side is shifted rearward from the reference side position by the shift amount Lx2. Here, a linear light 9 or a three-point spot light train 9a, 9 is obtained from the left laser distance meter 3.
When b and 9c are irradiated on the left side surface of the rolled material S, the linear light 9 or the three-point spot light trains 9a, 9b and 9c are reflected, and the image by the reflected light is detected by the two-dimensional detector 8 on the left side. Is done. The image of the linear light 9 detected by the detector 8 on the left side is shown in FIG.
The images b and 9c are shown in FIG. FIG. 9 (a)
Since the skew angle on the left side of the rolled material S is not 0 ° but inclined by θ1, the linear light 9 has an apparent inclination angle with respect to a horizontal reference c extending in the horizontal direction at the reference position b. Since the left side surface of the rolled material S is shifted toward the near side from the reference side surface position by the shift amount Lx1, the position of the central spot light 9a is lower than the reference position b by the apparent shift amount y21. It is shifted. Further, the position of the center spot light 9a is a position allocated to the apparent length p1 from one end to the center spot light 9a and the apparent length q1 from the other end to the center spot light 9a with respect to the linear light 9. It is located in. Referring to FIG. 10A, the skew angle on the left side of the rolled material S is not 0 ° but inclined by θ1, and the three-point spot light trains 9a, 9b, 9c are provided.
Is also tilted by an apparent tilt angle ξ1 with respect to the horizontal reference c extending in the horizontal direction at the reference position b, and the left side surface of the rolled material S is shifted by the shift amount Lx1 toward the near side from the reference side position. The position of the center spot light 9a is shifted downward from the reference position b by an apparent shift amount y21.
The position of the center spot light 9a is determined by the apparent length p1 from the spot light 9b on one side to the center spot light 9a with respect to the spot lights 9b and 9c on both sides, and the spot light 9 on the other side.
It is located at a position distributed over an apparent length q1 from c to the central spotlight 9a.

On the other hand, when the right side surface of the rolled material S is irradiated with the linear light 9 or the three-point spot light train 9a, 9b, 9c from the right laser rangefinder 4, the linear light 9 or the three-point spot light is emitted. The columns 9a, 9b and 9c are reflected, and the image by the reflected light is detected by the two-dimensional detector 8 on the right. The image of the linear light 9 detected by the right detector 8 is shown in FIG.
The images of the three-point spot light trains 9a, 9b and 9c are shown in FIG.
It is shown in (b). Referring to FIG. 9B, the rolled material S
Is inclined by θ2 instead of 0 °, so that the linear light 9 is inclined by an apparent inclination angle ξ2 with respect to a horizontal reference c extending in the horizontal direction at the reference position b. Since the right side surface of the rolled material S is shifted rearward from the reference side surface position by the shift amount Lx2, the position of the central spot light 9a is shifted upward from the reference position b by an apparent shift amount y22. The position of the central spot light 9a is determined by the apparent length p2 from the one end to the spot light 9a and the apparent length q from the other end to the spot light 9a with respect to the linear light 9.
2 are located at the positions allocated. FIG.
Referring to (b), the skew angle on the left side of the rolled material S is not 0 ° but inclined by θ2, so that the three-point spot light trains 9a, 9b, 9c also extend horizontally at the reference position b. Inclined by an apparent inclination angle ξ2 with respect to the reference c,
Further, since the right side surface of the rolled material S is shifted rearward from the reference side position by the shift amount Lx2, the position of the central spot light 9a is shifted upward from the reference position b by an apparent shift amount y22. The position of the central spot light 9a is different from the spot light 9b, 9c on both sides with respect to the spot light 9b on one side.
From the spot light 9c on the other side to the center spot light 9a and the apparent length q2 from the spot light 9c on the other side to the center spot light 9a.

The measurement distance L1 measured by the laser distance meter 3 on the left and the measurement distance L2 measured by the laser distance meter 4 on the right are calculated based on the above-mentioned equations (7) and (7) based on apparent deviation amounts y21 and y22, respectively. It can be similarly calculated by equation (11). Further, the measured plate width X of the rolled material S can be calculated in the same manner by the above-described equation (1). The skew angle θ1 on the left side and the skew angle θ2 on the right side of the rolled material S are determined by the linear light 9 or the three-point spot light train 9.
Calculated as a function of the apparent inclination angles ξ1, ξ2 of a, 9b, 9c and the measurement distances L1, L2, ie, the following (12)
It can be calculated by the equation and the equation (13).

[0046]

(Equation 12)

[0047]

(Equation 13)

The skew angle θ of the rolled material S can also be calculated by the following method. One end of the linear light 9 or the apparent length from the spot light 9b on one side of the three-point spot light train 9a, 9b, 9c to the central spot light 9a is p, and the other end or the three-point spot of the linear light 9 Light train 9
The apparent length from the spot light 9c on the other side of a, 9b, 9c to the spot light 9a is q, and the spread angle of the linear light 9 or the spread angle of the spot lights 9b, 9c on both sides with respect to the optical axis. Assuming that 2 is inclined by {}, the following equation (14) is established using the sine theorem from the relationship shown in FIG.

[0049]

[Equation 14]

By transforming equation (14), the following equation (1) is obtained.
5) Equation can be derived.

[0051]

(Equation 15)

From the equation (15), the skew angle θ of the rolled material S is obtained by the following equation (16).

[0053]

(Equation 16)

When the skew angle θ is obtained, the above-mentioned (3)
The true sheet width W of the rolled material S can be calculated by the equation. Here, θ = (θ1 + θ2) / 2. As mentioned above,
In the present embodiment, the laser light is linearly formed in the horizontal direction and linear light 9 having a peak at the center of the linear light or a three-point spot light train 9a, 9b, 9c is formed on the side surface of the rolled material S. When the rolled material S is obliquely viewed from above and at a predetermined angle, the linear light 9 or the three-point spot light train 9 is illuminated.
a, 9b, 9c also appear obliquely inclined, and the rolled material S
The linear light 9 or the three-point spot light train 9a, 9
The central spot 9a of b, 9c appears to move up and down.
From these facts, the measuring distances L1 and L2 to the side surface of the rolled material S, the measured plate width X of the rolled material S,
And the skew angle θ of the rolled material S with respect to the passing direction can be measured at the same time, whereby the true sheet width W can be measured with high accuracy while correcting the skew angle θ. Therefore,
It is not necessary to arrange a pair of distance meters on one side of the threading area of the rolled material S at a predetermined distance, and the laser distance meters 3 and 4 have been minimized in the number of parts, so that they can be installed in places where space is not available. Therefore, the area for disaster management can be minimized. In addition, since the irradiation range of the laser beam by the laser distance meters 3 and 4 is relatively narrow, it is possible to measure the measurement plate width X and the skew angle θ even near the ends of the leading end and the tail end of the rolled material S. it can.

[0055]

As described above, the apparatus for measuring the width of a rolled material according to the first and sixth aspects of the present invention and the second and seventh aspects of the present invention.
According to the strip width measuring method according to the above, by using a pair of laser rangefinders installed on both sides of the strip passing area of the rolled material, simultaneously measure the measurement plate width of the rolled material and the skew angle with respect to the stripping direction of the rolled material. be able to. Therefore, it is not necessary to juxtapose a pair of distance meters at a predetermined distance on one side of the passing area of the rolled material, and the number of parts of the laser distance meter was minimized,
It is advantageous for installation in places where space is not available, and the management area for disaster prevention can be minimized. Further, since the irradiation range of the laser beam by the laser range finder is relatively narrow, the measurement plate width and the skew angle can be measured even near the leading end and the tail end of the rolled material.

According to the method for measuring the width of a rolled material according to the third and eighth aspects, the true width of the rolled material is obtained by multiplying the measured width of the rolled material by the cosine value of the skew angle. be able to. According to the method for measuring the width of a rolled material according to the fourth and ninth aspects, in the image detected by the detector of the laser range finder, the linear reference or the three-point spot light train is aligned with the horizontal reference extending in the horizontal direction. The skew angle of the rolled material can be calculated from the apparent inclination.

Further, according to the method for measuring the width of a rolled material according to the fifth and tenth aspects, in the image detected by the detector of the laser distance meter, the center of the linear light or the three-point spot light train with respect to the reference position. The combination of the peak position and the proportional ratio at which the center spot light separates the linear light or the three-point spot light train, each measurement distance to the side surface of the rolled material, the measured plate width of the rolled material, the skew angle of the rolled material And the true sheet width of the rolled material can be calculated.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of an embodiment of a rolled sheet width measuring apparatus according to the present invention.

FIG. 2 is an explanatory diagram of a shape of a laser beam viewed from a plane side.

3A and 3B are graphs showing an intensity distribution of a laser beam, wherein FIG. 3A is a graph showing an intensity distribution of a linear light, and FIG. 3B is a graph showing an intensity distribution of a three-point spot light train.

FIGS. 4A and 4B show the state of reflection of laser light, wherein FIG. 4A is an explanatory view of the state of reflection of laser light as viewed from the front side, and FIG.

5A and 5B are a plan view and a front view showing a relationship between the laser distance meter and the rolled material when the skew angle of the rolled material in the sheet passing direction is 0 °.

6 shows an image of linear light detected by the laser distance meter shown in FIG. 5, and FIG. 6 (a) shows an image detected by the laser distance meter on one side (left side in FIG. 5) of the rolled material. Diagram,
(B) is a figure which shows the image detected by the laser distance meter of the other side of a rolled material.

7A and 7B show images of a three-point spot light train detected by the laser distance meter shown in FIG. 5; FIG. 7A is a diagram showing an image detected by a laser distance meter on one side of a rolled material; FIG. 4 is a diagram showing an image detected by a laser distance meter on the other side of a rolled material.

8A and 8B are a plan view and a front view showing a relationship between the laser distance meter and the rolled material when the skew angle of the rolled material in the sheet passing direction is not 0 °.

9 shows an image of linear light detected by the laser distance meter shown in FIG. 8, (a) shows an image detected by a laser distance meter on one side of a rolled material, and (b) shows a rolled image. It is a figure which shows the image detected by the laser distance meter of the other side of a material.

10A and 10B show images of a three-point spot light train detected by the laser range finder shown in FIG. 8, wherein FIG. 10A shows an image detected by a laser range finder on one side of a rolled material; FIG. 4 is a diagram showing an image detected by a laser distance meter on the other side of a rolled material.

FIG. 11 is a reference diagram of a geometry for calculating a skew angle.

FIG. 12 is a schematic plan view of a conventional apparatus for measuring the width of a rolled material.

[Explanation of symbols]

 1 is a rolled sheet width measuring device 2 is a table roller 3 and 4 is a laser range finder 5 is an image processing device 6 is a laser oscillator 7 is a cylindrical lens (lens means) 7 'is an optical system including a diffraction grating 8 is two-dimensional Detector (detector) 9 is linear light 9a is central spot light 9b, 9c is spot light on both sides b is reference position c is horizontal reference S is rolled material

Claims (10)

[Claims] An apparatus for measuring the width of a rolled material, comprising a pair of laser distance meters arranged on both sides of a passing area of the rolled material, wherein each of the laser distance meters includes a laser oscillator for outputting a laser beam; Laser means, the lens means to make a linear light by spreading in a fan shape so as to have an intensity distribution with a peak in the center in the horizontal direction through which the rolled material passes, and the lens means orthogonal to the side surface of the rolled material A detector that is installed at a predetermined distance from the optical axis of the linear light and that detects an image by reflected light of the linear light applied to the side surface of the rolled material; and an image detected by the detector. An image processing device for calculating a measurement plate width and a skew angle of the rolled material based on the following formula: 2. A pair of laser rangefinders are opposed to each other on both sides of a rolled sheet passing area, and respective measurement distances of the distance meter to the side surface of the rolled material are determined based on the opposed arrangement distance of the pair of laser rangefinders. By reducing, in the strip width measuring method of the rolled material to calculate the measured strip width of the rolled material, the laser light output from each of the laser distance meters, the peak in the center in the horizontal direction through which the rolled material passes Spread in a fan shape so as to have an intensity distribution having a linear light, the image by the reflected light of the linear light applied to the side surface of the rolled material, the line orthogonal to the side surface of the rolled material Detected by a detector installed at a predetermined distance from the optical axis of the shape light, the measured distance to the side of the rolled material based on the image, the measurement plate width of the rolled material, and the slope of the rolled material Calculate the line angle Plate width measuring method of the strip characterized by. 3. The rolled sheet according to claim 2, wherein the true strip width of the rolled material is obtained by multiplying the measured strip width of the rolled material by a cosine value of the skew angle. Width measurement method. 4. The rolled material according to claim 2, wherein the skew angle of the rolled material is calculated based on an apparent inclination of the linear light with respect to a horizontal reference extending in the horizontal direction in the image. Sheet width measurement method. 5. A method according to claim 1, wherein the measurement is performed on a side surface of the rolled material by a combination of a central peak position of the linear light with respect to a reference position and a proportional division ratio at which a central spot light separates the linear light. Distance, the measured plate width of the rolled material,
3. The method for measuring the width of a rolled material according to claim 2, wherein the oblique angle of the rolled material and the true width of the rolled material are calculated. 6. A rolled sheet width measuring apparatus in which a pair of laser rangefinders are arranged opposite to each other on both sides of a rolled sheet passing area, wherein each of the laser distance meters includes a laser oscillator for outputting a laser beam; The laser light is a three-point spot light train having a total of three peaks, one at the center and two at the same angle viewed from the center on both sides thereof, which are arranged in a straight line in the horizontal direction through which the rolled material passes. An optical system is installed at a predetermined distance from the optical axis of the three-point spot light train orthogonal to the side surface of the rolled material, and is reflected by the reflected light of the three-point spot light train applied to the side surface of the rolled material. A detector for detecting an image, comprising: an image processing device that calculates a measurement plate width and a skew angle of the rolled material based on the image detected by the detector. Plate width measuring device. 7. A pair of laser rangefinders are opposed to each other on both sides of a rolled sheet passing area, and each measurement distance of the distance meter to the side surface of the rolled material is determined based on the opposed arrangement distance of the pair of laser rangefinders. By reducing, in the strip width measurement method of the rolled material to calculate the measured strip width of the rolled material, the laser light output from each of the laser distance meters, in a straight line in the horizontal direction through which the rolled material passes line up,
One at the center and two on both sides with equal angles viewed from the center
A three-point spot light train having a total of three peaks of points, and an image formed by the reflected light of the three-point spot light train applied to the side surface of the rolled material is orthogonal to the side surface of the rolled material. Detected by a detector installed at a predetermined distance from the optical axis of the three-point spot light train, based on the image, the respective measurement distances to the side surface of the rolled material, the measured plate width of the rolled material, and the rolling A method for measuring the width of a rolled material, comprising calculating a skew angle of the material. 8. The rolled sheet according to claim 7, wherein a true sheet width of the rolled material is obtained by multiplying the measured sheet width of the rolled material by a cosine value of the skew angle. Width measurement method. 9. The rolling method according to claim 7, wherein the skew angle of the rolled material is calculated from an apparent inclination of the three-point spot light train in the image with respect to a horizontal reference extending in the horizontal direction. Material width measurement method. 10. A side surface of the rolled material by a combination of a central peak position of the three-point spot light sequence with respect to a reference position in the image and an apportionment ratio at which the central spot light separates the three-point spot light sequence. 8. The method according to claim 7, further comprising calculating the measured distances, the measured plate width of the rolled material, the skew angle of the rolled material, and the true plate width of the rolled material.
A method for measuring the width of a rolled material as described in the above.