JPS6265873A - Automatic speed reduction control device - Google Patents

Abstract

PURPOSE:To improve productivity and to prevent troubles from occurring by photographing a surface of a coil of band steel with an industrial television camera and controlling the feeding speed of a continuous process line by means of a digital operation unit and a control unit based on image signals from the camera. CONSTITUTION:From a coil of band steel C is fed out band steel S which is sent to a continuous process line 1. Here, an industrial TV camera 21 photographs a surface of the band steel coil C and sends image signals to a camera control 22. On the other hand, the camera control 22 receives 2-dimensional images from the camera 21 by means of a vertical synchronous raster scanning and sends them to a digital operation unit 23. The 2-dimensional image processed with sampling theorem and quantized by the digital operation unit 23 is sent to a monitor 24. At the same time the digital operation unit 23 calculates the residual coil length based on information on the coil and a line obtained from an superior computer 3 and sends the result to a line controller 4. Then the line controller 4 controls the drive speed of a driving device 5 of a continuous process line 1.

Description

Detailed description of the invention (a) Industrial application field The present invention directly captures the outer diameter of a steel strip coil with an industrial television camera, calculates the outer diameter of the coil through image processing, and then This invention relates to an automatic deceleration control device that controls speed.

(b) Conventional technology In equipment that unwinds steel strips from steel strip coils and sends them out to a continuous steel strip processing line, automatic deceleration of the line is performed at precisely the right timing to improve production efficiency and prevent line troubles. need to be determined.

Conventionally, a pulse generator (PLO) was attached to a priddle roll or the like, and the remaining coil diameter was calculated from the amount of payout per revolution of the payout reel to determine the remaining length of the coil. For this reason, changes in the roll diameter due to wear of the prydle roll over time or slippage between the prydle roll and the steel strip caused errors in the calculation of the remaining length of the coil, making accurate automatic deceleration impossible.

()・)Problems to be Solved by the Invention The problems to be solved by the present invention are to accurately grasp the remaining length of the steel strip coil and to improve line productivity and prevent line troubles. be.

(d) Means for solving the problem The automatic deceleration control device of the present invention is a device that unwinds the steel strip from the steel strip coil and sends it to a continuous steel strip processing line. an industrial television camera that samples and quantizes an image signal from the camera based on the coil and line information; and a digital computing unit that samples and quantizes the image signal from the camera based on the coil and line information; and a digital computing unit that samples and quantizes the image signal from the camera based on the coil and line information; The above problem is solved by a configuration consisting of a control device that controls the speed.

(e) Example As shown in FIG. 1, a steel strip coil C is fed into a steel strip S by a feeding device (not shown), and sent to a continuous steel strip processing line 1 such as a cold rolling mill. .

The automatic deceleration control device 2 of the present invention is an industrial television.
Camera 21, camera control device 22, digital computing unit 23
, monitor 24.

The camera 21 images the side surface of the steel strip coil C and sends an image signal to the camera control device 22. The camera control device 22 is 30
A two-dimensional image is obtained from the camera 21 by Hz vertically synchronized raster scanning and sent to the digital arithmetic unit 23.

The digital arithmetic unit 23 samples and quantizes the two-dimensional image, sends it to the monitor 24, obtains coil and line information from the host computer 3, calculates the coil remaining length, and sends it to the line control device 4.

The line control device 4 controls the driving speed of the driving device 5 of the continuous processing line 1 .

(F) Function The function of the automatic deceleration control device of the present invention will be explained with reference to the drawings.

From the host computer 3, the plate thickness t of the coil C (t=0.4 to 12
Assume that information on the deceleration target position L (L=20 to 40 m) is transmitted to the digital calculator 23.

In the automatic deceleration control device 2, the digital arithmetic unit 23 takes in the two-dimensional image signal from the camera control device 22 at Tm5ec (T=50 to 100 m5ec), samples and quantizes it to 8 bits, and stores it in the image memory.

As shown in Figure 2, the inner diameter of the mandrel? D.

(For example) o = 610 mm), L = 40 m, t
=2.0, and when the outer diameter of the coil is set, the following formula (1) holds true.

From formula (1) = 689 (tomo) From this, when the minimum plate thickness t = 0.4 mm, the required number of image pixels N is: Therefore, camera field of view Le = 400 mm Number of pixels = 102
When it is 4×1024, the resolution L7) per pixel is as follows.

In order to detect only the coil portion from the images captured every Tm5ec, preprocessing such as binarization of the image data is performed, and only the edge portion of the outer diameter of the coil is cut out.

The center point Po of the coil C shown in FIG. 2 is determined at the time of camera installation, and the position of the pixel is Po(Xo).

Yo ). Any point Pn on the outer diameter of the coil is (Xn
, Yn). The outer diameter Dn of the coil at point Pn is determined from the following equation (2).

・・・・・・・・・・・・(2) If this process is performed on all points 0 to 1023 (1024 points) in the X direction and the outer diameter is averaged, the final outer diameter of the coil will be , is obtained using equation (3).

(3) Therefore, the coil remaining length l at this time can be obtained from the following equation (4) from equation (1).

l=−(D−Do)/t−−
(4) Perform the above processing for each Tm5ec, and
When the position changes from J>L to l≦L, a deceleration command is output to the line control device 4.

(g) Effects According to the present invention, since the outer diameter of the coil can be measured accurately,
It is possible to improve line productivity and prevent line troubles.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an automatic deceleration control device of the present invention. FIG. 2 is an explanatory diagram showing the operation of the device of the present invention. Continuous processing line 2: Automatic deceleration control device 5: Drive device C: Steel strip coil S: Steel strip Patent applicant Sumitomo Metal Industries, Ltd. (5 others)

Claims (1)

[Claims] An apparatus for unwinding steel strip from a steel strip coil and sending it to a continuous processing line for steel strip, comprising: an industrial television camera that images the side surface of the steel strip coil; and an image from the camera based on the coil and line information. Sample the signal
An automatic deceleration control device comprising a digital arithmetic unit for quantization and a control device for controlling the feed rate of the continuous processing line based on a control signal from the arithmetic unit.