JPH076776B2 - Hot coil winding shape detector - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for non-contact and automatically detecting the winding shape of the side surface of a high temperature hot coil wound immediately after hot rolling.

Conventional technology In a hot coil production line, the wound hot coil is hooked with a U-shaped or L-shaped hook, lifted by a crane and transported to another yard, but the sides of the hot coil vary to some extent. Also, the coil is usually uneven, and depending on the degree of unevenness, the coil must be replaced with a deep hook so that the coil will not fall off the hook during transport and fall off, and the part that protrudes like a telescope will hook. It may be necessary to squeeze it in or tap it in to correct or rewind it. Therefore, it is necessary to know the degree of unevenness on the side surface of the coil, and in the past, an operator visually identified the side surface of the hot coil to perform hook replacement and ranking for correction.

On the other hand, a method of detecting the surface shape is known, and binocular stereoscopic vision using two cameras, or one or two slit light generators, and one or more TV cameras in combination for optical cutting. Methods based on the method and triangulation are widely known. Based on this principle, a method for detecting the winding shape of the coil side surface is also known. In Japanese Patent Publication No. 53-15018, the winding side surface of the coil is wound using one slit light generator and one camera. A device for detecting the shape is disclosed, but when the slit light is applied to the side surface of the coil having irregularities from one direction, a shadow is formed, and a blind spot occurs in which a reflected image of the slit light cannot be captured by a camera.

A common method for detecting surface topography uses two projectors on either side of the TV camera for this purpose. Japanese Patent Laid-Open No. 63-61108 discloses a method of detecting a three-dimensional shape of an object in a short time by using two slit light projectors and one TV camera.

Problems to be Solved by the Invention When detecting the winding shape on the side surface of the hot coil by reducing the blind spot area by the known method as described above, a measuring instrument for arranging the projectors on both sides of the TV camera is required. It becomes large and heavy, and there are problems such as that it is necessary to put the measuring equipment in a large shielding box to protect it from heat for long-term measurement in a high temperature environment.

In addition, in order to improve the measurement accuracy in the triangulation method, it is necessary to increase the distance between the TV camera and the projector. , The area of the blind spot which becomes a shadow becomes large. Therefore, the projector is usually positioned and fixed in a position where the blind spot formation area is small and measurement accuracy is not impaired, but the adjustment involves not only the adjustment work but also the measurement of the distance between the TV camera and the projector.
Very troublesome.

The present invention is intended to irradiate two or more slit lights from two directions in order to detect the winding shape of the coil side surface while reducing the blind spot area. The first object is to make the projection unit compact. In addition, in order to simplify the structure, one TV camera or other image input device and one projector are used to detect the winding shape on the side of the hot coil, and the adjustment of the projection position of the slit light is easy. The second purpose is to resist the possible detection device, and the second purpose is to be able to adjust the projection angle of the slit light.

Means for Solving the Problems and Actions In order to achieve the first object, a hot coil winding shape detecting device includes a projector that generates slit pattern light and two or more slit lights that are emitted from the projector. From a reflecting device equipped with a pair of opposite mirrors that reflect and project from the two directions on the hot coil side surface, an image input device that captures slit light projected on the coil side surface from two directions, and a slit light pattern image that is captured In a hot coil winding shape detection device that consists of an image processing device that extracts the contour image according to the shape of the hot coil winding side face and detects the winding shape, a ball screw in which both reflectors have different screw directions on the left and right sides. It is characterized by being attached to sliders which are respectively screwed to the left and right sides of the.

According to this device, two or more slit pattern lights are generated by one projector, the optical path is changed to the left and right by the reflecting mirror, and then another reflection is installed at a position apart from the image input device by a certain distance. It is projected from the mirror to the side of the hot coil.

The left and right reflecting mirrors move toward and away from each other by rotating the ball screw in the forward or reverse direction, and the amount of movement is obtained from the rotational speed and the screw pitch by measuring the rotational speed of the screw. To be

In the detection device for achieving the second object, the left and right reflecting mirrors of the above device are rotatably supported by sliders.

According to this device, the projection angle of the slit light changes depending on the direction of the reflecting mirror.

EXAMPLE FIG. 1 shows an example of a hot coil winding detection device according to the present invention, in which a slit pattern having a slit plate 2 is provided in a heat shield box 1 having transparent heat-resistant glass on the front surface. A projector 3 for generating light, a V-shaped reflector 4 which is positionally adjustable in the front-rear direction, in which the two slit lights emitted from the projector 3 are refracted by 90 ° in opposite directions and are reflected symmetrically. A reflector 6 arranged on the front side of the reflector 4 and directed to the side surface of the hot coil 5 that is sequentially conveyed by the belt conveyor 13, and a TV camera 7 that captures reflected light from the side surface of the hot coil through the reflector 6. Is provided, and windows 8 in which transparent heat-resistant glass is fitted are provided on both side surfaces so that slit light reflected by the reflecting mirror 4 is transmitted. In the box 1, a central portion of a ball screw 9 whose left and right screw directions are different from each other is rotatably supported on the bottom surface of the box 1 and extends rightward and leftward in accordance with the centers of both windows 8. The sliders 11 are respectively screwed onto the left and right portions at equal distances, so that the ball screws 9 are rotated in one direction to approach each other, and are rotated in the opposite direction so as to be moved symmetrically. A reflecting mirror 12 is rotatably supported by both the left and right sliders 11 so that the irradiation angle can be changed. The slit light reflected by the reflecting mirror 4 hits the reflecting mirror 12 through the window 8 respectively, The light is reflected by the reflecting mirror 12 and projected onto the side surface of the hot coil from two directions, left and right.

The slit light emitted from the projector 3 is made to strike the center of the reflecting mirror 6 by adjusting the position of the reflecting mirror 4 back and forth, and by changing the angle of the reflecting mirror 6 and adjusting the horizontal position. The projection position on the side surface of the hot coil can be changed.

Further, the slit plate 2 provided in the projector 3 is replaceable, and depending on the size of the hot coil and the space between the hot coil, the slit space, angle,
Can be changed to one with a different number of slits.

An image processing device 14 is connected to the TV camera 7, and the slit light contour image is extracted from the slit light pattern image taken by the TV camera 7 and the hot coil winding shape is detected in the device, thereby maximizing the unevenness. The measurement result regarding the value and its position is sent to the operator of the transport crane, and the crane is operated based on the information. FIG. 3 shows the procedure.

FIG. 4 shows an example of the processed image, and shows slit light images emitted from both left and right directions on both sides of the reference line c at the center of the screen. The horizontal length from the reference line c to the slit image is proportional to the actual amount of unevenness, and the amount of unevenness is calculated from the top to the bottom of the screen for each scanning line from the reference line c to the left and right slit images. This is done by finding the number of pixels respectively. If there is no blind spot, the average value of the number of pixels between the left and right slit images and the reference line is calculated, or the number of pixels between the left and right slit images is calculated and divided by two. When there is a blind spot, the amount of unevenness can be obtained by finding the number of pixels between the slit image and the reference line that do not become the blind spot.

EFFECTS OF THE INVENTION The present invention is configured as described above and has the following effects.

According to the apparatus described in claim 1, it is possible to automatically detect the winding shape on the side surface of the hot coil in a non-contact manner by reducing the blind spot forming area by using one projector and one image input device. The structure is simple because only one projector and one image input device are required as measuring equipment. Moreover, the slit light emitted from the projector is refracted by the reflecting device and projected on the coil side surface. Since they can be placed close to each other, they can be put in a small shielding box to easily perform heat insulation, and the measuring equipment can be made compact. The left and right reflecting mirrors are simultaneously moved toward and away from each other simply by rotating the ball screw in the forward or reverse direction, and the amount of movement is accurately obtained from the screw pitch by reading the number of rotations of the ball screw. As a result, the positions of the left and right reflecting mirrors can be adjusted accurately, easily and quickly according to the measurement conditions such as the distance from the hot coil.

If the angle of the reflecting mirror can be changed as in the apparatus according to the second aspect, the irradiation angle can be changed and the measurement conditions can be changed more easily.

[Brief description of drawings]

FIG. 1 is a schematic view of a hot coil winding shape detecting device, and FIG.
The figure shows an example of the shape of the slit plate, FIG. 3 is a flowchart of the shape detection process, and FIG. 4 is a figure showing an example of a detected image. 1 ... Shielding box, 2 ... Slit plate 3 ... Projector, 4, 6, 12 ... Reflecting mirror 5 ... Hot coil, 7 ... TV camera 9 ... Ball screw, 14 ... Image processing device

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hidekazu Miyauchi, 2-2, Hirosuehiro, Kure-shi, Hiroshima Prefecture, China Industrial Technology Institute, Industrial Technology Institute (72) Takayuki Shima, 11-11, Showa-cho, Kure-shi, Hiroshima Prefecture No. 1 Inside the Kure Steel Works Co., Ltd. (72) Inventor Yasuyuki Isomura 11-11 Showa-cho, Kure City, Hiroshima Prefecture No. 1 Inside the Kure Works Co., Ltd. Nisshin Steel Co., Ltd. (72) Tetsuro Maeno 11 Showa-cho, Kure City Hiroshima Prefecture No. 1 Toshiyuki Watanabe, Examiner, Kure Steel Works, Nisshin Steel Co., Ltd. (56) Reference JP 61-274207 (JP, A) JP 62-273403 (JP, A) JP 53-15018 (JP) , B2)

Claims (2)

[Claims] Claim: What is claimed is: 1. A projector comprising one projector for generating slit pattern light, and a pair of reflectors for reflecting two or more slit lights emitted from the projector and projecting the slit light onto the side surface of the hot coil from two directions. Device,
An image input device that captures slit light projected from two directions on the coil side, and an image that detects the winding shape by extracting a contour line image according to the shape of the hot coil winding side surface from the captured slit light pattern image In a hot coil winding detection device including a processing device, both reflecting mirrors of the reflecting device are attached to sliders which are respectively screwed to the left and right of a ball screw having different screw directions on the left and right. Hot coil winding shape detector. 2. The hot coil winding detection device according to claim 1, wherein the reflecting mirror is rotatably attached to the slider.