JPH07270129A - Plate width / meander amount detector - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a plate width / meandering amount detection device for a plate material. [Configuration] At least two two-dimensional image scanning cameras 5 and 6 and signal processing devices 7 and 8 are arranged symmetrically with respect to one light source 3, and arithmetic processing is performed in the signal processing devices 7 and 8. The two-dimensional distance sensor 10A is configured by providing the output control device 9 that outputs the plate width and the meandering amount signal according to the period determined by the time required for the measurement and the arithmetic processing and the number of the installed plates. It is possible to measure the board width and the amount of meandering at high speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate width / meandering amount detecting device for a plate material.

[0002]

2. Description of the Related Art A conventionally used two-dimensional distance sensor is, for example, of a laser type, and as shown in FIG. 4, a light beam LB having a slit shape and a fan shape elongated in the width direction of a plate material 1 to be measured. And a band of diffusely reflected light RB from the plate material 1 are received from different directions to detect the x direction and the y direction.
It is composed of one two-dimensional image scanning camera 5 that performs two-dimensional image scanning in the direction, and a signal processing device 7 that calculates the distance distribution to the plate material 1 using this scanning signal. Then, such a two-dimensional distance sensor 10 is installed in each pair at both ends of the plate member 1 to measure the plate width and the amount of meandering (see, for example, Japanese Patent Laid-Open No. 4-60405).

By the way, when the two-dimensional distance sensor 10 is used, the measurement cycle of the plate width and the amount of meandering is mainly the processing speed of the two-dimensional image scanning camera 5, the intensity of the light source 3 projecting light, and the signal. The rate is limited by three factors of the processing capacity of the processing device 7. When using the measurement result of the two-dimensional distance sensor 10 for rolling control, it is usually required that a high-speed calculation output of several ms to 10 ms is required.

Therefore, as means for achieving this high-speed calculation output, conventionally, (a) a method of increasing the intensity of a light source to shorten the scanning cycle of a two-dimensional image scanning camera, or (b) two-dimensional image scanning Method of increasing the sensitivity of the light receiving element and speeding up the scanning electric circuit system in the performance of the type camera, or
(c) A method for developing / introducing a signal processing device having a high calculation processing capability for the plate width and the amount of meandering, that is, a quick calculation time can be considered.

However, in the method (a) for shortening the scanning period, the size of the apparatus becomes large, so that it is necessary to introduce an unnecessarily expensive light source, which is disclosed in Japanese Patent Laid-Open No. 4-60405. It is difficult to implement such a multipurpose sensor, and the safety management of operators and the like becomes unnecessarily strict. As for the method of improving the performance of the 2D image scanning camera in (b), 2D image scanning cameras usually use 350,000 to 45 points in total in the width and height directions.
In contrast to scanning a large number of pixels, if the scanning speed is further increased, it is necessary to reduce the number of pixels and reduce the measurement resolution and measurement accuracy. On the contrary, there is a contradictory problem that it is necessary to increase the number of pixels in order to satisfy the required measurement accuracy. Therefore, the performance of the currently industrially mass-produced 2D image scanning type camera is reduced. It is essential to make dramatic improvements. This inevitably results in a significant increase in manufacturing cost.

In the case of the development and introduction of the high-speed signal processing device of (c), due to the recent improvement in the processing time of personal computers and miniconclasses, an environment where the processing power required for the device used for rolling control can be achieved is there. However, since the measurement system as a whole is rate-controlled by the requirements of (a) and (b) above, the problem that the calculation time of plate width and meandering amount cannot be shortened compared to the scanning time of a two-dimensional image scanning camera There is.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and a two-dimensional image scanning type camera which is currently industrially mass-produced. An object of the present invention is to provide a plate width / meandering amount detection device for a plate material, which uses a light source of a conventional level and can significantly reduce the image processing time and speed up the calculation process.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to one light source for irradiating a slit-like light beam in the width direction of a plate material and one two-dimensional image scanning camera for receiving diffusely reflected light from the plate material. And at least one pair of two-dimensional distance sensors each corresponding to both ends of the plate member, each of which includes a signal processing device that calculates a plate width and a meandering amount from a distance distribution measured by the two-dimensional image scanning camera. In the plate width / meandering amount detection device for the plate material, each of which is installed separately, at least two two-dimensional image scanning cameras and a signal processing device that constitute the two-dimensional distance sensor are symmetrically positioned with respect to one light source. And an output control device for outputting the plate width and meandering amount signals arithmetically processed in the signal processing device in accordance with a period determined by the time required for the measurement and arithmetic processing and the number of installed devices. Plate width of the plate material, wherein the digit-
It is a meandering amount detection device.

[0009]

According to the present invention, by arranging at least two 2D image scanning cameras with respect to 1 light source at symmetrical positions, the distance of one point on the plate can be determined by a plurality of 2D distance sensors. Since the output is measured in synchronization with each other according to the period determined by the time required for the measurement of those two-dimensional image scanning type cameras and the arithmetic processing in the signal processing device and the number of installed units, The measurement cycle can be shortened and high-speed arithmetic processing can be performed.

[0010]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a conceptual diagram showing the configuration of an embodiment of the present invention. As shown in the figure, the two-dimensional distance sensor 10A of the present invention shows two two-dimensional image scanning cameras 5 and 6 with respect to one light source 3 which emits a conventional slit-shaped light beam. The signal processing devices 7 and 8 are connected symmetrically on the upstream side and the downstream side with respect to the plate material 1 traveling in the F direction, and corresponding to these two two-dimensional image scanning cameras 5 and 6. In addition, these two signal processing devices 7,
The arithmetic processing signal from 8 is input to one output control device 9 to be processed and output controlled.

By arranging one light source 3 and two two-dimensional image scanning cameras 5 and 6 in this manner, the first measurement composed of the light source 3 and the two-dimensional image scanning camera 5 is performed. The system A and the second measurement system B including the light source 3 and the two-dimensional image scanning camera 6 constitute two triangulation type rangefinders. Therefore, when the distance signals to the plate material 1 measured by the two two-dimensional image scanning cameras 5 and 6 are used to calculate the plate width and the meandering amount in the signal processing devices 7 and 8, the first measurement system is used. Assuming that the time required for measurement and calculation processing of A and the second measurement system B is t seconds, the calculation cycle of each signal processing device 7, 8 in the output control device 9 is divided into half cycles as shown in FIG. It is controlled so as to be shifted and synchronized in time, and the calculation result is output. As a result, the output signal can be output at a cycle of t / 2, so that the output signal can be output at twice the speed.

In the case of the above embodiment, two triangulation rangefinders are constructed in the traveling direction of the plate material 1 (direction indicated by the arrow F), which is advantageous when there is no space in the plate width direction. However, when there is no space in the traveling direction of the plate material 1 and there is space in the plate width direction, as shown in FIG.
By installing the mirrors symmetrically in the width direction, it is possible to obtain the same effect.

In the above embodiment, the case where two two-dimensional image scanning type cameras are used has been described, but the number of two-dimensional image scanning type cameras can be further increased, whereby output control can be performed. The cycle of the output signal in the device 9 can be further reduced to t / (number of installed units). Furthermore, the present embodiment describes the case of measuring the plate width and the amount of meandering using a two-dimensional image scanning camera, but the present invention is not limited to this.
It goes without saying that, for example, by combining with a range finder, it can be applied to shape measurement such as belly extension and ear extension of a traveling plate material and path level measurement of the plate material.

[0014]

As described above, according to the present invention,
Since the two-dimensional distance sensor in which at least two two-dimensional image scanning cameras and the signal processing device are arranged for one light source is configured, it becomes possible to perform measurement at a high speed cycle, and thus the plate width It is possible to improve the control effect such as meandering.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a conceptual diagram illustrating a measurement cycle.

FIG. 3 is a schematic diagram showing the configuration of another embodiment of the present invention.

FIG. 4 is a schematic diagram showing a conventional example of a two-dimensional distance sensor.

[Explanation of symbols]

 1 plate material 3 light source 5,6 two-dimensional image scanning camera 7,8 signal processing device 9 output control device 10A two-dimensional distance sensor

Claims (1)

[Claims] 1. A light source for irradiating a slit-shaped light beam in the width direction of a plate member, a two-dimensional image scanning camera for receiving diffused reflected light from the plate member, and the two-dimensional image scanning type. A plate of a plate material in which at least one two-dimensional distance sensor including a signal processing device for calculating a plate width and a meandering amount from a distance distribution measured by a camera is installed at each end of the plate material. In the width / meandering amount detecting device, at least two two-dimensional image scanning cameras and a signal processing device that constitute the two-dimensional distance sensor are arranged symmetrically with respect to one light source, and the signal processing device. A plate material provided with an output control device for outputting the plate width and meandering amount signals calculated in step S1 according to a period determined by the time required for the measurement and the calculation process and the number of installed devices. Plate width and meandering amount detection device.