JPH04232803A - Running body width measuring device - Google Patents

Abstract

PURPOSE:To correctly measure the surface width size of a thick object with an irregular edge shape in no contact during conveyance. CONSTITUTION:A light source 4 radiating the surface of a measured material perpendicularly to the conveyance direction is arranged on a conveyance line. Linear array type cameras 2, 3 are arranged on the upstream and downstream sides centering on the light source 4 at the upper position than the light source 4. The interval between the linear array type cameras 2, 3 is set to the minimum length or below of the measured object. The linear array type cameras 2, 3 receive the reflected light from the surface of the measured material. Height sensors 5a, 5b measuring the height of the measured material are arranged at the same axial position horizontally as the linear array type camera 2 on both sides of a conveyance line. The skew angle of the measured material against the conveyance line center, the warp of the measured material, and the width quantity increased in measurement due to vibration are calculated and corrected by an arithmetic unit based on signals of the linear array type cameras 2, 3 and signals of the height sensors 5a, 5b to obtain the true width.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a running width measuring device for optically measuring the width of a material to be measured while traveling on a conveyance line.

0002

[Prior Art] Generally, in a continuous hot rolling mill, which is a steel plate (strip) manufacturing equipment in a steel mill, a steel billet, which is the raw material for a steel plate (strip), is inserted into a heating furnace as a pretreatment for rolling. Raise the temperature to

However, when inserting steel billets into a heating furnace in accordance with the rolling order, there are cases where an incorrect steel billet is inserted by mistake, causing process confusion. Therefore, as a preventive measure, the width and length of the steel piece should be measured manually or with a contact measuring device described in Japanese Utility Model Application No. 62-3251 and No. 62-34308 on the conveying table before insertion. ing.

0004

[Problems to be Solved by the Invention] Manual width measurement is not only dangerous, but also prone to human errors such as misreading the scale, and furthermore, there are problems that hinder the effective use of personnel. On the other hand, contact type width measuring devices are not yet effective due to maintenance problems due to collisions with steel pieces and vibration.

[0005] As a non-contact width measurement technique, Japanese Patent Application Laid-open No. 1983-
Japanese Patent No. 252206 describes a method in which a light source is placed on the lower surface of a material to be measured in order to improve the S/N ratio, and the width is measured based on the length of the light-shielding material. This method is unsuitable for measuring the width of the surface of objects that are thick (50 to 300 mm) like steel pieces, have uneven edges, and are irregular. .1 to 30 mm) with a constant edge shape.

[0006]

[Means for Solving the Problems] The gist of the present invention is to provide a running width measuring device that optically measures the width of a material to be measured while traveling on a conveying line. A light source that is arranged and illuminates the surface of the material to be measured, and a light source that is located above the light source and located upstream and downstream from the light source so that the distance between the two is set to be less than or equal to the minimum length of the material to be measured; A linear array camera that receives reflected light from the surface of the material to be measured, and a height that measures the height of the material to be measured, which are installed on both sides of the conveyance line at the same axial position in plan as one of the linear array cameras. Based on the sensor, the signal from the linear array camera, and the signal from the height sensor, calculate the oblique angle of the material to be measured with respect to the center of the conveyance line, and the amount of increase in width due to warpage and vibration of the material to be measured. This is a running width measuring device characterized in that it is comprised of a computing device that corrects and calculates the true width.

[0007]

[Operation] The drawings show embodiments of the invention.

As shown in FIG. 1, a steel piece 1 which is a material to be measured is
is transported by the transport table 7 in the direction of the arrow. Figure 2
, 3, a light source 4 that illuminates the surface of the steel billet is disposed above the conveyance table 7 in a direction perpendicular to the conveyance direction. The light source 4 may be a laser or a halogen lamp, but a commercially available fluorescent lamp is preferred because it is inexpensive and provides a stable amount of light. The illustrated example is a fluorescent light source, and two lamps are arranged in the width direction. As a result, the surface of the steel piece 1 can always receive a constant amount of light in the width direction.

[0009] Linear array type cameras 2 and 3 are arranged above the light source 4, one each at equal intervals on the upstream and downstream sides of the light source 4, and the distance between them is set to be less than the minimum length of the steel piece. do. Linear array cameras 2 and 3 receive reflected light from the surface of the steel piece 1 and measure the width. Height sensors 5a and 5b are provided on both sides of the conveyance table 7 and at the same axial position in plan as the linear array camera 2, and the linear array camera 2 measures the height of the steel billet 1 at the same position when measuring the width. . Steel piece detection sensors 6a are installed on both sides of the conveyance table 7.
, 6b are placed to detect the presence of the steel piece 1. Computing unit 8 connects linear array cameras 2 and 3, and height sensors 5a and 5b.
The true width is calculated by correcting the width based on the signal from.

Note that FIG. 4 shows the steel piece detection sensors 6a and 6b.
This information also shows how to input it to the computer 8, and while the steel piece 1 is present, it is used as information for width measurement by the linear array cameras 2, 3, height sensors 5a, 5b, and the computer 8. It is preferable to do so.

The apparatus according to the embodiment of the present invention has the above-mentioned configuration, and the measurement procedure will be described below.

When the surface of the steel piece 1 is irradiated with fluorescent light from the light source 4 and the reflected light is received by the linear array cameras 2 and 3, the analog waveform is as shown in FIG. 5(a). In order to stably detect the surface edge of the steel piece 1 in this waveform, a point that is lower than the overall waveform level and higher than the noise level is set as an edge detection point. Figure 5(a)
The waveform in FIG. 5(b) is obtained by digitally processing the waveform in FIG.

[0013] If sand or foreign matter is on the surface of the steel piece, the waveform will break into two or more pieces as shown in FIG. If this crack is smaller than the minimum strip width, it is determined by the counter built into the computer 8 so that it is not considered as an edge.
Process to find the true edge.

When the steel billet 1 is set on the conveyance table 7 and during conveyance, it has an oblique angle with respect to the direction of movement of the conveyance table 7, so if the width is measured as it is, the measurement will be larger than the actual width due to the oblique angle. In order to correct this angle, two linear array cameras 2 and 3 are arranged in the traveling direction at a value L smaller than the minimum length of the steel billet, as shown in FIGS. 1 and 2. If the measured values of linear array cameras 2 and 3 from the line center are Ai and Bi, respectively, the skew angle θ is θ=±ta
n-1(Ai-Bi)/L. Therefore, the true width W can be determined by inputting the measured value Wi into the calculator 8 as W=Wi·cos θ.

Next, if the steel piece warps or vibrates as a result, the value becomes larger than the actual value. For this correction, height sensors 5a and 5b are arranged on both sides of the transport table 7 and at the same axial position as the linear array camera 2 in a plane. The height sensors 5a and 5b only need to be able to detect the height that takes into account the maximum amount of warpage and vibration; for example, a large number of photosensors arranged at regular intervals of 5 mm or less, or the height can be obtained in an analog manner. A commercially available sensor will suffice. As shown in Figure 6, the amount of warpage and vibration is △
Let H be the width amount increased due to the influence, and 2·ΔW is 2·ΔW=ΔH·Wi/(H−ΔH). In this way, by inputting the measured values ΔH of the height sensors 5a and 5b into the computer 8, it is possible to determine the amount of width increased due to warpage and vibration.

[0016] Therefore, the true width W, taking into account the angle correction and the amount of warp vibration, is calculated as follows: W=Wi cos θ-2 ΔW=Wi (c
osθ−ΔH/(H−ΔH)). This is calculated by computer 8
By calculating the true width W, it is possible to easily obtain the true width W.

[0017]

[Example] Next, an example of measurement using the apparatus of the present invention will be given.

[0018] Using the steel billet width measuring device shown in Figs. 1 to 4, a steel billet with a width of 1,200 mm, a length of 5,000 to 9,900 mm, and a thickness of 235 mm is transferred to a transfer table with a width of 1,800 mm.
The measurement was carried out by conveying at a conveying speed of 90 m/min. The setting conditions of the device are as follows. Camera height H = 2,000mm Distance between cameras L = 1,000mm Number of camera light receiving elements = 3,528 bits Light source: 2 40W fluorescent lamps Light source height: 1.5m Height sensor: 60 1mm pitch photosensors during transportation The billet settings are as follows. Steel billet warpage/vibration amount △H = 0 to 60 mm Conveyance angle = 0 to 5 degrees

The measurement results are shown in Table 1.

[0020]

[Table 1]

Note that the comparative example is an example in which measurements were made without angle correction or height correction.

[0022]

[Effects of the invention] The device of the present invention can correct angles and prevent warping.
The amount of vibration can be corrected, and compared to the comparative example, it is possible to correct a total of 72 mm, including 5 mm for angle correction and 67 mm for warp vibration amount, and the effect is large with inexpensive equipment.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a plan view of an embodiment of the present invention.

FIG. 3 is a front view of an embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a connection system between a linear array camera, a height sensor, a steel piece detection sensor, and a computer.

FIG. 5 is an explanatory diagram showing analog waveforms and digital waveforms detected by a camera.

FIG. 6 is an explanatory diagram showing the amount of measurement width change due to warpage and vibration.

[Explanation of symbols]

1 Steel piece 2, 3 Linear array camera 4. Light source 5a, 5b height sensor 6 Steel billet detection sensor 7 Transfer table 8 Arithmetic machine

Claims (1)

[Claims] 1. A running width measuring device that optically measures the width of a material to be measured while traveling on a transport line, comprising: a light source disposed above the transport line perpendicular to the transport direction and illuminating the surface of the material to be measured; and are arranged above the light source and upstream and downstream from the light source so that the distance between them is less than or equal to the minimum length of the material to be measured, and receives the reflected light from the surface of the material to be measured. a linear array camera, a height sensor for measuring the height of the material to be measured, which is provided on both sides of the conveyance line at the same axial position as one of the linear array cameras; and a signal from the linear array camera. , Based on the signal from the height sensor, calculates the skew angle of the material to be measured with respect to the center of the conveyor line, the warpage of the material to be measured, and the amount of width increased during measurement due to vibration, and corrects it to determine the true width. A running distance measuring device characterized in that it is comprised of a machine.