JPH05157537A - Plate-shape measuring apparatus - Google Patents

Abstract

PURPOSE:To obtain a plate-shape measuring apparatus, which can accurately measure the strain of a plate material, which is conveyed in the slant state, even with the simple constitution of the apparatus. CONSTITUTION:The image of a fluorescent lamp 1 on the surface of a plate is photographed with a CCD camera 3. A central position Dk of the images of the fluorescent lamp 1 is measured at five measuring positions based on the image data. A looper-driving-shaft angle Rtheta is measured. A reference-line position SLtheta is corrected with a table for the looper-driving-shaft angle and the reference-line position, which are inputted beforehand. The absolute value SDk of the distance between the corrected reference line SLtheta and the position Dk of the image, which is moved by the strain of the plate, is computed. Then, the value of the measured position, whose moved distance is shorten is used as the reference, and the relative moving distance DELTAmk at each measuring position is obtained. The obtained relative moving distance is converted into the relative elongation length of the plate DELTAmk with a table for converting the relative moving distance into the relative moving length, which are inputted beforehand. Then, the moving speed vi of the plate material in measurement is used, and the relative elongating length of the plate is converted into the plate elongation length nk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate shape measuring device for measuring the strain of a plate material by comparing the plate elongations of a plurality of predetermined measurement points in the width direction of the transferred plate material.

[0002]

2. Description of the Related Art Conventionally, various measuring devices have been proposed as a method for measuring the strain of a plate material. Typical conventional measuring devices include the following. A. Measuring device to which the displacement measuring method is applied This measuring device has non-contact type displacement measuring devices arranged at a plurality of positions in the width direction of the plate. The measurement is performed as follows.
First, the vertical displacement of the surface of the plate is periodically measured at each position of the plate being transferred. Then, the strain angle of the plate (the tilt angle due to the strain) is measured from the measured values of the vertical displacement before and after the time and the distance the plate has moved in the time before and after the time. The measured strain angle gives the length of the surface of the displaced plate. The surface shape of the plate is three-dimensionally measured by comparing the integrated value of the surface length, so-called arc length, at each position of the plate detected by each displacement meter.

Alternatively, one displacement gauge is configured to reciprocate in the width direction of the plate, and the displacement gauge is reciprocated in the plate width direction while transferring the plate to obtain the length (arc) of the surface in the plate width direction. The surface shape of the plate is measured by measuring a number of arc lengths and comparing the measured arc lengths. B. This measuring apparatus includes a light source that emits a laser beam and a two-dimensional camera that captures an image of a spot formed by the laser beam from the light source striking the plate surface. Then, in this measuring device, the amount of positional deviation between the spot image obtained when there is no distortion in the surface shape of the plate and the spot image actually obtained, and the angle of the laser light flux to be applied, in the plate width direction Measure the height of the board surface at each position. The surface shape of the plate is measured by obtaining a large number of heights thus measured as the plate is transported. Since the measurement accuracy increases as the incident angle of the laser light flux decreases, the laser light source is installed far away from the two-dimensional camera (for example, 2 meters).

[0004]

However, each of the above conventional devices has the following unique problems. First, in the measuring device A to which the displacement meter method is applied, there is a problem that a plurality of displacement meters are installed and a configuration in which the displacement meters are moved back and forth is required, which complicates the configuration. In addition, since the plate width of the object to be measured is not constant, it is necessary to increase or decrease the displacement gauge or increase or decrease the distance of the reciprocating movement of the displacement gauge, which causes a problem that the work becomes complicated.

The measuring device B to which the optical cutting method is applied has a problem that a large space is occupied because the two-dimensional camera and the laser light source need to be installed separately. Further, since a laser light source is used, there is a problem that the device configuration becomes complicated and expensive, and that there is a floating substance in the measurement environment, the laser light is scattered and measurement becomes difficult. It was

Further, in order to apply a predetermined tension to the plate material to be conveyed, some rollers of the conveying path are installed at a different height from other rollers, and in a line in which the plate material is meandered in the vertical direction and conveyed. , The plate material is conveyed in an inclined state,
This inclination angle is changed according to the tension applied to the plate material, and it is desired to measure the shape of the plate material in the line where the plate material is inclined and thus conveyed. Even in the above-mentioned conventional apparatus, it is possible to measure the strain of the plate material conveyed in an inclined state, but there are various problems as described above.

The present invention has been made to solve the above problems, and provides a plate shape measuring apparatus capable of highly accurately measuring the strain of a plate material conveyed in an inclined state with a simple device configuration. The purpose is to provide.

[0008]

In order to achieve the above object, the present invention, as illustrated in FIG. 1, compares the plate elongations of a plurality of predetermined measurement points in the width direction of the transferred plate material by comparing the plate elongations. In the plate shape measuring device for measuring the distortion of the plate material, a rod-shaped light source arranged in the width direction of the plate material above the plate material to be transferred, and a light source image which is arranged in proximity to the rod-shaped light source and is reflected on the surface of the plate material. Imaging means for imaging
Inclination angle detecting means for detecting an inclination angle of the conveyance path of the plate material, and a relationship in which data indicating a relationship between the data regarding the distortion angle of the plate material surface and the position of the light source image that changes according to the distortion angle is stored in advance. Based on a difference between a data storage unit and a preset reference position of the light source image and a position of the light source image captured by the image capturing unit, the plurality of the plurality of plate members in the width direction of the plate member from the relational data storage unit. Data extraction means for obtaining data on the distortion angle of the measurement point, reference position correction means for correcting the reference position of the light source image based on the tilt angle detected by the tilt angle detection means, and the data extraction means A plate shape measuring device comprising: a plate elongation calculating means for calculating plate elongations of the plurality of measurement points in the width direction of the plate material from the extracted strain angle data. .

[0009]

In the plate shape measuring apparatus according to the present invention, the image pickup means picks up an image of the light source reflected on the surface of the plate material of the rod-shaped light source arranged in the width direction of the plate material, and the relational data storage means stores the data concerning the distortion angle of the plate material surface. And the data indicating the relationship between the position of the light source image that changes according to the distortion angle are stored in advance, and the data extraction means
Data relating to the distortion angles of a plurality of measurement points in the width direction of the plate material based on the difference between the preset reference position of the light source image and the position of the light source image picked up by the image pickup means with reference to the relational data storage means. Then, the plate elongation calculation means calculates the plate elongation at a plurality of measurement points in the width direction of the plate material from the data on the strain angle extracted by the data extraction means. Then, the tilt angle detection means detects the tilt angle of the sheet conveying path, and the reference position correction means corrects the reference position of the light source image based on the tilt angle detected by the tilt angle detection means.

Therefore, from the plate elongation calculating means, the plate elongation due to the strain of the plate material can be obtained excluding the influence of the inclination of the conveying path of the plate material.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, a plate shape measuring device for measuring the shape of a continuous plate material transferred on a rolling line will be described below. First, the measurement principle of the plate shape measuring device will be described. As shown in FIG. 2A, the fluorescent lamp 1 and the two-dimensional CCD camera 3 are arranged above the plate material T,
Both of the fluorescent lamp 1 and the lens surface of the two-dimensional CCD camera 3 are set to be equal in height.

In FIG. 2A, a plate material having no distortion is shown by a solid line as a plate material T0, and a plate material having a distortion is shown as a plate material Ti by a one-dot chain line. When measuring a flat plate material T0 without distortion, the virtual image of the fluorescent lamp 1 with respect to the plate material T0 is at the position Q0. At this time, when viewed from the CCD camera 3 side, the plate material T
The image of the fluorescent lamp 1 is visible at the position P0 on the surface of 0.

On the other hand, when measuring the plate member Ti having a distortion, the virtual image of the fluorescent lamp 1 with respect to the plate member Ti is located at the position Qi. At this time, when viewed from the CCD camera 3 side, the plate material Ti
The image of the fluorescent lamp 1 is visible at the position Pi on the surface of the. The image of the fluorescent lamp 1 is formed on the image pickup surface of the CCD camera 3, and the image formation position moves in correlation with the inclination of the plate T due to the distortion, as will be described later. Therefore, the relationship between the image position and the inclination of the plate T is measured in advance,
If the data is stored in the conversion table, the distortion angle θ of the plate material can be obtained based on the position of the captured image. The distortion angle θ is an inclination angle due to the distortion of the plate material.

Next, the relationship between the image position and the tilt angle due to distortion will be described with reference to FIGS. As shown in FIG.
The fluorescent lamp 1, the CCD camera 3, and the plate material T are arranged so as to have a positional relationship similar to that of an actual plate shape measuring device. That is,
The CCD camera 3 was placed at a position 200 mm away from the fluorescent lamp 1, and the distance between these and the plate T was 2000 mm. As the test member, a flat plate material T is used instead of the plate material having a strain angle due to the plate strain, and the inclination of the plate material T is changed.

Then, the inclination of the plate T is changed to change the CCD.
The camera 3 captures an image (virtual image) of the fluorescent lamp on the surface of the plate T, and obtains the relationship between the center position of the image of the fluorescent lamp and the inclination angle of the plate T. In this embodiment, the peak point of the luminous intensity is set to the center of the image of the fluorescent lamp 1, but as the peak point of the luminous intensity, an intermediate point between two points where the luminous intensity curve having the peak point intersects with a predetermined threshold level. Is used approximately. That is, the midpoint between the two points where the above-mentioned luminous intensity curve and the predetermined threshold level intersect is calculated, and the calculated midpoint is taken as the peak point of luminous intensity.

In FIG. 4, which shows the relationship between the center position of the fluorescent lamp image and the inclination angle of the plate material T thus obtained, the horizontal axis of the graph shows the inclination of the plate material T, and the vertical axis shows the luminous intensity peak. Indicates the position of a pixel. The fluorescent image is CC
Although it extends in the direction corresponding to the width direction of the plate material on the imaging surface of the D camera 3, here, the measurement is performed at one measurement point among a plurality of measurement points in the width direction of the plate material. ing. That is, the position of each pixel shown in FIG. 4 is on one straight line parallel to the direction corresponding to the transport direction of the plate material on the imaging surface.

It can be seen from FIG. 4 that there is a one-to-one correspondence between the inclination angle of the plate material T and the position of the fluorescent lamp image reflected on the plate material T. When the transport path of the plate material T is inclined, the position P0
, Pi moves in accordance with the inclination angle of the conveying path of the plate material, the inclination angle of the conveying path is obtained, and the reference position of the fluorescent lamp image on the imaging surface that moves corresponding to this inclination angle is calculated, When the difference between the positions of the fluorescent lamp images captured at the plurality of measurement points in the plate width direction and the reference position is calculated, this difference in position represents the distortion angle θ of the plate material.

Then, as shown in FIG. 2 (b), 1 / COSθ is obtained from this strain angle θ, and by integrating this, the relative plate elongation length due to strain can be obtained. In this embodiment, as the conversion table, a table in which the relationship between the position difference previously obtained and the relative plate elongation length is stored is used, and the relative plate elongation length is obtained from the position difference. ..

Next, the accuracy of the distortion angle obtained by this measurement principle will be described. As the test member, a flat plate material T was used instead of the plate material having a distortion angle due to the plate strain, and the plate material was tilted and arranged on a spacer placed on a horizontal and flat support surface. By changing the height of the spacer, the angle difference between the actual angle of the plate material T when the angle of the plate material T is slightly changed and the angle obtained based on the position of the fluorescent lamp image is shown in Table 1 below. To illustrate. The CCD camera 3
Unlike the above case, the fluorescent lamp 1 was placed at a position 125 mm away from the fluorescent lamp 1, and the distance between these and the plate material T was 2000 mm as in the above case.

[0020]

[Table 1]

In Table 1, the angle of the plate material in the leftmost column is the actual angle of the plate material T obtained by the geometric calculation,
The image position in the right column is the pixel number of the peak position of the luminous intensity, and the angle in the right column is the angle obtained using a table created in advance under the same conditions as above.

In Table 1, the actual angle and the measured angle are in good agreement. From this, it is understood that the distortion angle of the plate material can be obtained with high accuracy from the center position of the fluorescent lamp image. It should be noted that when the plate material T is moved in parallel in the vertical direction and the height of the plate material T is different, it is considered that the images are taken at different positions even if the plate material T has the same distortion angle. Was carried out while changing the height of the plate material, the following results were obtained.

[0023]

[Table 2]

Table 2 shows the height of the plate T as a reference position (0 m
m), 70 mm above the reference position, 150 from the reference position
mm and above the reference position by 250 mm, and the angle of the plate material T was changed from 0 ° to 9 ° by 1 ° and measured. The numbers in the table are the numbers of pixels at the peak position of illuminance. At the reference position, the distance between the fluorescent lamp 1 and the CCD camera 3 and the plate material T is 2000 mm.
Is the position. The distance between the fluorescent lamp 1 and the CCD camera 3 was set to 125 mm as in the case of Table 1.

From Table 2, it can be seen that, if the angles are the same, the positions of the images are almost the same even if the heights of the plate materials T are different. Therefore, even when the plate material T moves in parallel in the vertical direction and the height of the plate material T changes, the tilt angle, that is, the distortion angle of the plate material T can be uniquely determined by the position of the obtained image. I understand.

FIG. 5 shows a block diagram of the plate shape measuring apparatus of this embodiment. In FIG. 5, CCs of 1 and 2 fluorescent lamps
The detection unit 5 including the D cameras 3a and 3b is provided in the rolling line, and the processing unit 11 connected to the detection unit 5 via the relay units 7a and 7b is provided in a control room or the like. The processing unit 11 includes a connector conversion unit 13, fluorescent lamp image position measuring devices 15a and 15b, and a monitor TV 17.
, Signal input / output unit 19 and I / O unit 21
A sub CPU 23, a main CPU 25, a printer buffer 27, and a printer 29.

The CCD cameras 3a and 3b share a substantially half area in the width direction of the plate material, and capture a fluorescent lamp image reflected on the plate material in each area. The CCD cameras 3a and 3b
Are housed in an environment-resistant housing to which dry air is supplied from the outside. The connector conversion unit 13 is C
It is a converter for connecting the connector of the CD camera cable and the extension cable. Fluorescent lamp image position measuring device 15a, 15b
Is an image processing device for detecting the position of the fluorescent lamp image on the plate surface. The image monitor 17 is a monitor of a fluorescent lamp image that has been image-processed by the fluorescent lamp image position measuring device.

The signal input / output unit 19 is equipped with input / output terminals for various signals. The I / O unit 21 accommodates various interfaces. The sub-computer 23 collects measurement data, inputs external signals, outputs measurement results, etc. The main computer 25 manages various calculations, the entire data storage device, and the printer 29 via the printer buffer 27. To print. As described above, in order to speed up the measurement, this apparatus separates the measurement / data processing work from the calculation / display processing work and adopts a parallel processing system by two computers.

FIG. 6 is a flow chart showing the processing contents of the main routine program stored in the storage device of this measuring apparatus, and FIG. 7 is a flow chart showing the operation of the main CPU 25 in the measurement routine shown in FIG. FIG. 8 is a flowchart showing the operation of the sub CPU 23 in the measurement routine.

First, the main routine will be described.
In step S1, the interface is initialized. Next, in step S2, the measurement mode is automatically set and measurement is performed. In this embodiment, at the start of rolling, a sensor (not shown) detects that a plate material is inserted between a predetermined pair of rolling rollers, and this sensor detection signal is transmitted via the signal input / output unit 19. Main CP
When input to U25, the automatic measurement is performed.
When a specific key of the keyboard of the main CPU 25 is operated without inputting the detection signal, any one of the following menu selection processes is performed. That is, in step S3, a menu is selected. If it is determined in step S4 that the measurement mode is selected, the measurement process is performed in step S5, and if it is determined in step S6 that the setting mode is selected, step S7. If various setting processes are performed in step S8 and it is determined in step S8 that the maintenance mode is selected,
Maintenance processing is performed in step S9. Step S
At 10, it is determined whether or not all the processes have been completed. If not completed, the process returns to step S3, and if completed, the operation is completed.

In the measurement routine of step S2 or S5, the main CPU 25 operates as follows. In step S41, data transfer is performed and the data required for measurement is sent to the sub CPU 23. Next, in step S42, a measurement command is sent to the sub CPU 23. Next, in step S43, timing adjustment for synchronizing with the sub CPU is performed. Next, in step S44, the plate material to be measured is the above-mentioned plate material from the time when the sensor provided on the pair of rolling rollers outputs. The measurement timing is delayed by the time until it is conveyed to the position of the detection unit. Next, in step S45, a measurement start command is output. After that, the measurement process is performed on the sub CPU 23 side. The measurement result is from the sub CPU 23 to the main CP.
It is sent to U25.

Next, in step S46, the sub CPU 2
The measurement data output from 3 is collected, and then, in step S47, it is determined whether or not the measurement process is to be ended. If the process is not completed, the elongation rate calculation and the elongation difference rate calculation described below are performed in step S48, and step S49 is performed.
In step S50, the result is stored in the data RAM, and in step S50, the result is displayed in a graph.
When the processes of steps S46 to S50 are repeated and the measurement of the predetermined range of the plate material to be measured is completed, the measurement end command is issued to the sub CPU in step S51.
To 23.

Next, in step S52, it is determined whether or not the printer output is performed. If the printer output is selected, the measurement result is printed by the printer 29 in step S53. Next, in step S54, it is determined whether or not to save data, and if data saving is selected, in step S55, data is written to the floppy disk or the like.

In the measurement routine, the sub CPU
23 operates as follows. In step S401,
Perform initialization processing. Next, in step S402, the process waits until the measurement start command is sent from the main CPU 25. When the start command is sent, the plate width data of the plate is input and processed in step S403. The plate width data is obtained by a plate width sensor (not shown) and automatically input to the sub CPU 23. Next, in step S404, the board width data is stored in the main C
Transfer to PU25. Next, in step S405, the position of the measurement window is calculated. This measurement window is a process of calculating a predetermined position to be measured in the width direction of the plate material based on the input plate width data.
It is calculated individually for the D cameras 3a and 3b. next,
In step S406, the measurement window position data is transferred to the main CPU 25. Next, the timing is adjusted to synchronize with various interfaces.

In step S409, the fluorescent lamp image position is arithmetically processed, and then in step S410, analog signal input processing such as plate material transfer speed data and data representing the drive angle of the looper drive motor is performed. Here, the looper drive motor is a motor for driving a predetermined roller in the vertical direction to give a predetermined tension to the plate material, and the drive angle data is the plate material generated by moving the roller in the vertical direction. It corresponds to the inclination angle of the transport path.

Next, in step S411, a plate elongation amount is calculated as described later, and then in step S412,
Accumulate the sheet elongation. In step S413, it is determined whether or not the plate material has been conveyed by a predetermined unit length based on the plate material transfer speed. If not, step S413
Return to 407. When the sheet is conveyed by the predetermined unit length, the obtained plate elongation amount data is transferred to the main CPU 25 in step S414. Next, step S4
In 15, an elongation rate calculation and an elongation difference rate calculation which will be described later are performed, and the data is passed through the I / O unit 21.
Output to the signal input / output unit 19, and step S407
Return to.

If it is determined in step S408 that the measurement has been completed, the operation is completed. FIG. 9 is an explanatory diagram for explaining a specific operation of measuring the shape of a plate material by this device. The measurement procedure of this device will be described below. In step S101, two CCD cameras capture an image of the surface of one fluorescent lamp arranged above the rolling plate. FIG. 10 shows an imaging situation and its monitor image when the plate material placed horizontally is imaged. When there is a distortion such that the central portion of the plate material bulges upward, a fluorescent lamp image in which the central portion bulges as shown in FIG. 10 is obtained.

Next, in step S102, the measurement position is set. The measurement position is set automatically based on the plate width setting value input from the outside and the dead distance of the plate end input as the initial setting value. Next, step S
In 103, five measurement positions shown in FIG. 11 from the imaged image data (operation side plate end a, operation side 1/4 position b, plate center c, power side 1/4 position d and power side plate end e) At, the center position Dk of the image of the fluorescent lamp is measured.

Next, the shaft angle Rθ of the looper drive motor is measured, and in step S104, the reference line position SLθ is corrected by the looper drive shaft angle-reference line position table that has been input in advance. Line LN in FIG.
1 represents the position of the fluorescent lamp image projected on the plate material when the plate material is assumed to be flat and the conveyance path of the plate material is inclined by a predetermined angle, and the line LN2 is the inclination angle of the conveyance path. When 0 is set to 0, the position of the fluorescent lamp image on the plate is shown. The position difference between the line LN1 and the line LN2 corresponds to the correction amount SLθ.

Next, in step S105, the absolute value SDk of the distance between the corrected reference line SLθ and the position Dk of the image moved by the plate distortion is calculated. Next, step S106.
At the measurement position with the smallest movement distance, SDmi
The relative movement distance Δmk of each measurement position is obtained with n as a reference.

Next, in step S107, the relative movement distance Δmk is set relative to the relative movement distance Δmk by a preset relative movement distance-relative plate elongation length conversion table showing the relationship between the relative movement distance Δmk and the relative plate elongation amount mk. Converted to plate elongation mk. Next, in step S108, the relative plate elongation amount mk is converted into the plate elongation length nk using the plate material transfer speed vi at the time of measurement. Note that nk = mk · vi · T, and the sampling time T is constant (for example, 1/60 seconds).

Next, in step S109, the plate extension lengths are integrated. That is, the processes from step S103 to step S108 are repeatedly performed and accumulated until the data of the designated unit length is obtained, and the accumulated plate extension length Lk is obtained.
Is required. Then, in step S110, the elongation difference rate and the elongation rate distribution are calculated based on the above data.

Here, the elongation difference ratio is the ratio of the difference in elongation between the plate width center and the plate edge in the unit length to the plate width center plate length, and is expressed by the following equation (1). Elongation difference rate = [(L1 + L5) / 2−L3] / L3 × 10 ⁵ (1) Here, L1 and L5 are the plate elongation lengths of the plate ends, and L3 is the plate elongation length of the plate center. Is.

The elongation distribution is the ratio of the difference in elongation between the measurement position of the minimum plate elongation length and the other position to the minimum plate elongation length when the plate material is conveyed by a unit length, and the following formula ( It is represented by 2). Elongation rate distribution = (Lk−Lmin) / Lmin × 10 ⁵ (2) Here, Lmin is the minimum plate elongation length.

Next, in step S111, the calculation result is output as a predetermined signal, and the main CPU 2
It is displayed on the CRT screen of 5. Note that the execution of the process of step S104 functions as a reference position correction means,
The execution of the process of 07 functions as a data extracting unit, and the execution of the processes of steps S108 to S110 functions as a plate elongation calculating unit.

As described above, according to the present embodiment, since the fluorescent lamp is used as the light source, it is possible to measure even in the presence of suspended matter. Less affected by. Further, since the fluorescent lamps are arranged in the width direction of the plate, the light source and the CCD may be changed depending on the plate width of the plate material.
No need to move the camera position. As a result, a mechanism for moving is not required, which facilitates maintenance. Further, from the above, the present measuring device can be manufactured at low cost.

Further, according to this measurement principle, the fluorescent lamp and the CCD camera can be arranged close to each other, so that the installation space is small. By disposing the fluorescent lamp and the CCD camera at the same height from the plate surface, the plate strain can be accurately detected even if the plate member moves in parallel and the plate member height changes.

Further, in the present embodiment, the axis angle of the looper drive motor is measured, and the looper drive axis angle which is input in advance-
Since the reference line position is corrected by the reference line position table, the distortion angle of the plate material that is not affected by the inclination of the transport path can be measured by a measuring device having a simple configuration using a fluorescent lamp.

[0049]

As described above, according to the present invention, since the rod-shaped light source is arranged in the plate width direction, it is not necessary to move the positions of the light source and the CCD camera depending on the plate width of the plate material as in the prior art. As a result, a mechanism for moving is not required, which facilitates maintenance and enables inexpensive manufacturing.

Further, since the rod-shaped light source and the image pickup means can be arranged close to each other, the installation space can be reduced. Furthermore, since it is not necessary to use a laser beam as a light source as in the conventional case, it is possible to perform the measurement without lowering the accuracy even if a suspended matter or the like exists in the measurement environment.

Further, by simply correcting the reference position of the fluorescent lamp image based on the inclination angle of the conveying path of the plate material conveyed while being inclined, the elongation of the plate material can be calculated without the influence of the inclination of the conveying path. Therefore, even when the plate material is conveyed while being inclined, the strain of the plate material can be measured by the measuring device having a simple configuration.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a plate shape measuring device of the present invention.

FIG. 2 is an explanatory diagram of a measurement principle of the plate shape measuring device.

FIG. 3 is a schematic diagram of a measuring device that measures the relationship between the position of the image of a fluorescent lamp and the distortion angle.

FIG. 4 is a graph showing the measurement result of the relationship between the position of the image of the fluorescent lamp and the distortion angle.

FIG. 5 is a block diagram showing a configuration of a plate shape measuring apparatus according to this embodiment.

FIG. 6 is a flowchart showing the processing contents of a main routine program stored in the storage device of the measuring device.

7 is a main CPU in the measurement routine shown in FIG.
3 is a flowchart showing the operation of FIG.

FIG. 8 is a flowchart showing an operation of a sub CPU in a measurement routine.

FIG. 9 is an explanatory diagram for explaining a specific operation of measuring the shape of a plate material by the present device.

FIG. 10 is an explanatory diagram showing a situation when a plate material placed horizontally is imaged and a monitor image thereof.

FIG. 11 is an explanatory diagram of captured image data, measurement positions, and various measurement data.

[Explanation of symbols]

1 ... Fluorescent lamp 3a, 3b ... CCD camera 15 ... Fluorescent lamp image position measuring device 19 ... Signal input / output unit 23 ... Sub CPU 2
5 ... Main CPU

Claims (1)

[Claims] 1. A plate shape measuring device for measuring strain of a plate material by comparing plate elongations at a plurality of predetermined measurement points in the width direction of the plate material to be transferred, the plate material being above the plate material to be transferred. A rod-shaped light source arranged in the width direction of the plate member, an image pickup unit arranged in the vicinity of the rod-shaped light source, for capturing a light source image on the surface of the plate member, and an inclination angle detection unit for detecting an inclination angle of a conveyance path of the plate member. And a relational data storage unit that stores in advance data indicating a relationship between the data regarding the distortion angle of the plate material surface and the position of the light source image that changes according to the distortion angle, and a preset reference position of the light source image And data extraction means for obtaining data relating to strain angles of the plurality of measurement points in the width direction of the plate material from the relational data storage means based on the difference between the position of the light source image captured by the image capturing means and Based on the tilt angle detected by the tilt angle detection means, a reference position correction means for correcting the reference position of the light source image, and the width direction of the plate material from the data regarding the distortion angle extracted by the data extraction means. A plate shape measuring device comprising: a plate elongation calculating unit that calculates a plate elongation at the plurality of measurement points.