JPS614913A - Device for detecting flatness of running plate material - Google Patents

Abstract

PURPOSE:To know simultaneously the distortions in lateral and longitudinal directions by finding the difference in the detecting values among No. 1 distance detecting means measured from the surface of the plural plate material arranged in the width direction of the plate material between table rollers, and the difference of No. 2 distance detecting means arranged at the prescribed distance in longitudinal direction. CONSTITUTION:Distance sensors 30, 32, 34 are arranged in the width direction of a plate material 10 positioned between table rollers 12, 14 and the distortion shape in width direction of the plate material 10 is detected by detecting the absolute distances a, b, c which are from the fixed height to the surface of the plate material 10. Distance detecting sensors 36, 38, 40 are also arranged at the prescribed distance in the longitudinal direction of the plate material on the same position with the sensors 30, 32, 34 being in the width direction of the plate material between the rollers 12, 14, and the similar distances x, y, z are detected with the same timing as the distances a, b, c and the distortion shape in longitudinal direction is detected from the comparison of the both.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a flatness detection device for traveling plate materials, and is particularly suitable for use in detecting the flatness of metal plates, especially thick plates, that are conveyed at high temperatures and high speeds by table rows or veneers. The present invention relates to an improvement in a flatness detection device for a traveling plate for detecting the distorted shape of a plate traveling on conveyance table rollers.

[Conventional technology]

Generally, in hot rolling of a steel plate, it is important to flatten a plate having a target thickness and a target cross-sectional profile. Therefore, conventionally, the three target values of plate thickness, cross-sectional O-feel, and flatness are controlled simultaneously using various actuators such as roll axis deflection due to rolling load, bender, and work roll shift. Therefore, it is important to accurately detect the flatness online and reflect it in the control.At a high temperature of 300'CJ: J, and at a distance of 0.5m
For example, as shown in FIG.
2.14.16, a water column resistance type sensor 2o or a water column ultrasonic type sensor 2o capable of measuring the distance from the fixed position to the surface of the plate material 10 in the direction perpendicular to the traveling direction of the plate material 10 according to 2.14.16 is used. Arrange multiple sensors, each sensor 2
There is a method of measuring the distortion shape of the plate material 10 in the width direction based on the difference in the detected value of 0, and as also shown in FIG. A method of measuring the shape of distortion in the width direction of the plate material 10 using the optical image obtained by capturing the image with a 24-meter lens has been proposed and put into practical use.

[Problems to be solved by the invention]

However, in all such conventional flatness detection devices, although the strain shape in the width direction of the plate material 10 can be detected, in the longitudinal direction of the plate material 10, the shape as shown in FIG. 9 is detected according to the longitudinal strain shape. Like, table roller 1
Between 2.14 and 16, the plate 10 sinks by hl from the top of the table roller, or rises by h as shown in FIG. 10, so it is difficult to accurately detect the longitudinal strain shape of the plate 10. The problem was that it could not be done. In order to solve this problem, especially with thin plates, the applicant has already proposed in Japanese Patent Application No. 58-227857 a water column resistance type sensor at the same position in the width direction between each table roller that conveys the plate. The presence or absence of distortion in the longitudinal direction of the board is determined by comparing the relative relationship between the measured values measured simultaneously by each sensor and the set value, and the detected value of any one of the sensors is determined according to the determination result. We have proposed a method for measuring flatness in the longitudinal direction of a plate material, which is characterized by determining the amount of distortion based on this method, but as it is, it has not been possible to accurately detect the flatness of the entire plane of a plate material, especially a thick plate.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned conventional problems, and in addition to detecting the shape of distortion in the width direction of the plate material, it is also possible to accurately capture the shape of distortion in the longitudinal direction. It is an object of the present invention to provide a flatness detection device for a traveling plate material that can accurately detect flatness. [Means C for Solving the Problems] The present invention provides a flatness detection device for a traveling plate for detecting the distorted shape of a plate running on conveying table rollers, in which a plurality of flatness detectors are arranged in the width direction of the plate between the table rollers. established,
A first distance detecting means for detecting the distance from the surface of the plate material at the arrangement position, and the first distance detecting means in the width direction of the plate material between the same table rollers at the same position as at least one of the first distance detecting means. at least one second distance detection means arranged a predetermined distance apart from the first distance detection means in the longitudinal direction of the plate for detecting the distance to the surface of the plate at the installation position; Distance detection hand. The above object is achieved by determining the distorted shape of the plate material in the width direction and longitudinal direction based on the difference in the detected value between the stages and the difference in the detected value between the first distance detecting means and the second distance detecting means. This is what I did.

[Effect]

In the present invention, in order to detect the distorted shape of the plate material 10 in the width direction, as shown in FIG.
A plurality of distance detection sensors 30, 32, and 34, for example, three distance detection sensors 30, 32, and 34, are disposed in the width direction of the plate material between the four. Therefore, by detecting the absolute distances a, b, and c from a certain fixed height to the surface of the plate material 10 with each distance detection sensor 30, 32, and 34, and finding the difference between each detected value, The distorted shape of can be detected. In this case, even if the plate material 10 sinks between the table rollers 12 and 14 as shown in FIG. 2, the detected values a, b, and c will change by the same amount.
The relative distance difference between points remains unchanged. This is the same even when the plate material 10 floats. Therefore, the distance detection sensors 30, 32, and 34 arranged in the width direction can accurately detect the distorted shape in the width direction of the plate even when the plate 10 sinks or rises. On the other hand, if the distortion in the longitudinal direction of the plate is detected by using only the distance detection sensor 32 at the center in the width direction of the plate and from the time-series changes in the detected value, it will not be possible to accurately detect the distortion in the longitudinal direction of the plate if the plate sinks. Unable to detect. Therefore, in the present invention, as shown in FIG. 1, the same table roller 12.
14 in the width direction of the plate material 30.32.
At the same position as 34, the distance detection sensor 30.32.3
For example, three distance detection sensors 36, 38, and 40 are disposed at a predetermined distance from 4 in the longitudinal direction of the plate material. The interval between conveyor table rollers in a normal hot rolling line is 8.
00 to 1000 u, and since hot strips and thick plates are thick, they hardly bend due to their own weight even in hot conditions. Therefore, as shown in FIG. 3, when the detection values b (1) 1) and V (V; V+ bl can be detected, and K is located at 1
This corresponds to the distortion between L2 and L2. Next, the point L2 is the position of the distance detection sensor 32, and the point L3 is the position of the distance detection sensor 32.
When the distance between the sensors in the horizontal direction of the plate is β, and the conveyance speed of the plate 10 calculated from the rotational speed of the table roller is V, a predetermined value set to an integral multiple of V/β is reached. When the detection values b2 and y2 are detected after the sampling pitch of , it is possible to detect the difference Vz-112 in the height of the positions L2 and L3 in the plate longitudinal direction. By sequentially repeating this process, as shown in FIG. 4, it is possible to accurately detect, for example, the distorted shape in the longitudinal direction of the plate at the central portion in the width direction of the plate. The same method can be used to detect the distorted shape in the longitudinal direction of the plate at the edge of the plate. Here, the strain shape in the board width direction is 1fL1, L2,...
・Since all of the above are determined, the flatness of the entire plane of the plate can be accurately detected by combining it with the distorted shape in the longitudinal direction of the plate detected in this way. Note that the number of distance detection sensors in the board width direction is not limited to three, and can be increased or decreased depending on the desired level of detection. Further, each distance detection sensor may be fixedly arranged or movably arranged. Furthermore, although it is sufficient to install a number of sensors in the longitudinal direction corresponding to the number of sensors in the width direction, due to space constraints, for example, in the longitudinal direction, the accuracy does not change much even if only one sensor is installed in the center. In that case, for example, for the three distance detection sensors 30, 32, and 34 in the width direction, only the center distance detection sensor 38 is used in the longitudinal direction, and the distance difference between the distance detection sensors 32 and 38 is determined by the distance detection sensor 30.36 and 3
It is estimated to be the same as the distance difference between 4.40 and 40. The above describes hot materials at a certain high temperature, but even cold materials can be used as table rollers if they have a thickness such that deflection due to their own weight between the table rollers can be ignored. The flatness of the vehicle can be measured while the vehicle is traveling along the route.

【Example】

Examples of the present invention will be described in detail below. In this embodiment, the flatness detecting device according to the present invention is installed on the rolling unloading side of a thick steel plate that is conveyed by table rollers with a diameter of 400 mm and an arrangement interval of 1 m. A total of three sensors are arranged, one in the center and two at the ends of the plate, and one sensor each is placed 250 mm upstream of these three sensors in the direction of movement of the plate. In such an example, a strained cold steel plate was transported at a speed of 2°5 Ill/sec to detect strain. If the sampling pitch of the distance to the plate material is 0.1 seconds, the distorted shape in the longitudinal direction of the plate can be detected at 25011+1 pitches. The detection results of the distorted shape are shown in FIGS. 5 and 6. As is clear from FIG. 5, in the conventional method shown by the broken line A, the distortion is detected on the large side due to the influence of the sinking of the plate material, whereas in the method of the present invention shown by the solid line B, the distortion is detected on the large side. can be detected with high accuracy. Furthermore, as is clear from FIG. 6, using the distortion wavelength and amplitude H shown in FIG. Accurate detection is possible. Steepness (%) = H/LX100...(1)

【Effect of the invention】

As explained above, according to the present invention, it is possible not only to detect the shape of strain in the longitudinal direction of the plate, but also to accurately capture the shape of strain in the longitudinal direction of the plate, regardless of sinking or uplift in the longitudinal direction of the plate. Therefore, it has an excellent effect of being able to accurately detect the flatness of the entire plane of the plate material.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the basic configuration of a flatness detection device for a running board according to the present invention, and FIG. 2 is a side view showing the principle of detecting a distorted shape in the board width direction in the present invention. Figure 3 is
Similarly, FIG. 4 is a side view showing the principle of detecting the strained shape in the horizontal direction of the plate, FIG. FIG. 6 is a diagram showing a comparison of detected values of plate longitudinal strain in the method, and the actual steepness detected in the method of the present invention. Figure 7 is a diagram showing the correlation of steepness, Figure 7 is a diagram showing the definition of steepness, Figure 8 is a perspective view showing the principle of the conventional flatness detection method, Figure 9 is a diagram showing the sinking of plate material. FIG. 10 is a side view showing a state in which the plate material is lifted up. 10...Plate material, 12.1.4.16...Table roller, 30.32
．． 34.36.381.40... Distance detection sensor.

Claims (1)

[Claims] (1) In a flatness detection device for a traveling plate for detecting the distorted shape of a plate running on a conveying table roller, a plurality of flatness detectors are arranged in the width direction of the plate between the table rollers, and and a first distance detecting means for detecting the distance between the first distance detecting means and the plate material at the same position as at least one of the first distance detecting means in the width direction of the plate material between the same table rollers. at least one second distance detection means for detecting the distance to the plate surface at the installation position, which is arranged at least a predetermined distance apart in the longitudinal direction, and between the first distance detection means. A traveling plate material characterized in that the distorted shape of the plate material in the width direction and longitudinal direction is determined based on the difference between the detected values and the difference between the detected values of the first distance detecting means and the second distance detecting means. Flatness detection device.