JPH0788550A - Automatic deceleration control device of coil processing line passing speed in inlet side - Google Patents

Abstract

PURPOSE:To improve the precision for remaining length calculation for coil tail end automatic deceleration at process line inlet side. CONSTITUTION:As the device measures a number of coiling of remaining coil to precisely grasp remaining length of a coil 1, a number of coiling is measured by the television camera, which has the resolution enough to identify sheet thickness and picks up coil side face, and by processing a picture 8. Further, a remaining coil length is calculated from a coil inside diameter, outside diameter and remaining number of coiling, deceleration timing is determined in comparison with the deceleration start remaining length calculated from the present passing speed and deceleration rate. By improving deceleration timing precision, there is no need to start deceleration in early time, the productivity of coil processing is improved. Also it is made possible to set lessened loop quantity, and make the coil processing equipment compact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process line for rewinding a coil, pickling, rolling, annealing, and surface treatment, and more particularly to automatic deceleration of equipment for rewinding an incoming coil. .

[0002]

2. Description of the Related Art The most common coil automatic deceleration method on the entry side of a process line is the number of rotations of a given roll, the diameter of the roll, and the number of rotations of a reel being unwound. The current coil diameter is calculated from the above, the remaining coil length is calculated from the coil inner diameter and the plate thickness of the threaded plate material that are known in advance, and deceleration is started in anticipation of the deceleration length. However, with this conventional method, an error occurs in the remaining length calculation of the coil due to roll slip and wear, and when an off gauge (non-standard plate thickness) part with a different plate thickness is wound near the inner winding of the coil. Had a problem of increasing the error, and it was difficult to decelerate at an accurate timing.

Therefore, in order to solve the problem, in the device disclosed in Japanese Patent Laid-Open No. 60-96318, the total number of turns of the coil is measured in advance and the remaining number of turns is calculated from the number of rewinding revolutions of the reel. However, since the measurement is performed in a state where the coil diameter before rewinding is large, there is a drawback in that the traverse equipment for the laser light emitter and the light receiver is required and the equipment structure becomes complicated.

Further, in the device disclosed in Japanese Patent Publication No. 4-71826, the side surface of the coil being rewound is photographed by a television camera, the outer diameter of the coil is measured by image processing, and the coil thickness is determined from a previously known plate thickness. Although the remaining number of turns of the roll was calculated, errors such as roll slips could be prevented, but it was difficult to accurately measure the remaining length because the off gauge error was not included in the calculation.

[0005]

As described above, according to the conventional method, it is difficult to accurately grasp the remaining length of the coil. Therefore, it is necessary to avoid overrun of the tail end of the coil, so that it is possible to avoid it. In addition to slowing down to productivity and sacrificing productivity, it was inevitable to have inefficient operation and equipment such as equipped with a looper equipment with surplus capacity capable of passing at low speed.

An object of the present invention is to complete a mechanism capable of preventing the occurrence of various line troubles due to poor residual length calculation accuracy in such a coil processing line automatic deceleration control device on the inlet side, thereby achieving efficient operation and the effect of equipment equipment. The object is to provide a device that can be fully utilized.

[0007]

As a result of intensive studies to solve the problem, the inventors found that the problem of the conventional method is that the outer diameter of the coil is measured and the number of remaining turns is calculated from the thickness of the coil. Since the remaining length is calculated based on the above, it was found that it was not possible to deal with the case where there was a change in plate thickness. Therefore, the present invention is
The remaining number of turns is measured directly to prevent errors due to plate thickness fluctuations. That is, the gist of the present invention is as follows: (1) In a facility for continuously rewinding a steel strip from a coil, a device for measuring the number of remaining turns of the coil while rewinding, and calculating the remaining length of the coil A computing device, and a deceleration position control device for completing deceleration at the deceleration target position,
A coil processing line entry side automatic deceleration control device characterized by comprising a control device for controlling the line speed; (2) As a device for measuring the number of remaining turns of the coil, a resolution with which the plate thickness of the coil side face can be identified. A coil processing line entry side automatic deceleration control device according to the above item (1), characterized in that a television camera and an image processing device are provided.

[0008]

Since the remaining number of turns of the coil is measured and the remaining coil length is calculated based on the remaining number of turns, even if the relationship between the coil diameter and the remaining coil length varies due to the off gauge of the plate thickness and the gap between the coil inner plates, It is possible to obtain the remaining coil length that is not affected by this variation. As a result, according to the present invention, variations in the remaining length of the coil at the completion of deceleration are reduced, so that low-speed travel time is shortened, productivity is improved, and excess capacity of the looper can be reduced, resulting in efficient equipment. You can equip it.

[0009]

FIG. 1 shows an embodiment of the present invention. The coil 1 attached to the rule 2 is rewound. In the above-mentioned conventional most general method, the plate passing speed is obtained by the rotation speed of the roll 4 on which the pulse generator 5 for detecting the rotation speed is installed and the diameter of the roll, and the pulse generator 3 installed on the reel 2 is obtained. The outer diameter of the coil 1 in the strip is calculated from the rotation speed measured by Further, the plate thickness of the steel strip currently being threaded is given by a higher-level computer (not shown), and the remaining number of turns is calculated from the diameter and plate thickness to calculate the remaining length. However, even when the outer diameter of the coil is constant as described above, when the inner winding includes a portion having a different plate thickness such as an off gauge, the remaining length changes greatly.

Therefore, in the embodiment shown in FIG. 1, an image of the side surface of the coil 1 is captured by the television camera 6, binarization processing is performed by the image processing device 8, and the remaining shadow of the coil 1 is counted by counting the shadows due to the plate thickness. Measure the number of turns and outer diameter. FIG. 2 is a diagram in which the side surface of the coil is photographed by a television camera (CCD camera), and a signal example 12 in which one horizontal scanning line of the television screen is taken out is also shown in FIG.
The signal 12 has a level difference between the plate portion 13 and the gap portion 14 between the plates, and the number of turns can be obtained by binarizing this and counting the bright portions of the plate. This is done by the device 9.

The image processing device 8 performs the following image processing and calculation: A1. Image signals of a line passing through the center of the screen and several lines before and after the line are digitally converted, and a brightness histogram of image data for several lines obtained thereby is calculated, and a binarization threshold value is set based on this histogram. Set; A2. The image data of several lines is converted into a binary signal ("1": black (gap), "0": white (plate) binary image data) with the binarization threshold. Yes; A3. The center position (extending direction x of the line: the horizontal axis of the camera output 12 in FIG. 2) xi of each continuous “1” block on the two-dimensional plane of the binary signal is calculated. This xi
Is the position of the lateral width center of the gap portion 14. A4: Calculate the distance (x direction) between adjacent center positions,
Count the number of appearances of the same distance (creation of distance histogram); A5: Determine the distance (peak position on the distance histogram) with the largest number of appearances as the plate thickness; A6: Coil 1 outermost surface The position is determined from xi obtained in A3, and it is wound around the reel 2 based on the outer peripheral radius (fixed value) of the reel 2 and the positional relationship (fixed) of the television camera 6 with respect to the reel 2. Calculate the winding thickness of the coil 1 (outer diameter of coil 1-outer diameter of reel 2); A6: The plate thickness obtained in A5 and the winding thickness obtained in A6 are given to the remaining length computing device 9.

The remaining length calculation device 9 uses the remaining length Lr (reel 2) each time the image processing device 8 gives a plate thickness and a winding thickness.
The total length of the steel sheet wound on the sheet is calculated and given to the deceleration position control device 10. Deceleration position control device 10
Is the remaining length Ls (reference value) at which deceleration should always be started.
Is calculated so that deceleration is completed from the current strip running speed to the specified speed, leaving the cut length set by the host computer and the margin length that is significantly shorter than before, and the current remaining length Lr A deceleration signal is issued at a time point where is smaller than the deceleration start remaining length Ls. Upon receiving the deceleration signal, the line control device 11 decelerates to a specified speed at a specified deceleration rate.

If the reel 2 has a cylinder for expanding and contracting the reel, an accurate reel can be obtained by its stroke.
The outer diameter of the lens is detected and is given to the image processing device 8.

When the calculation of the remaining length is not so accurate, for example, immediately after the coil rewinding is started, in the application of the present invention, the image capturing range of the side surface of the coil 1 by the television camera 6 is limited to the inner diameter portion and the apparatus is compact. Can be In this case, the remaining length cannot be measured until the coil 1 becomes small and the outer diameter portion of the coil 1 is included in the image of the television camera 6, but if the remaining length calculation according to the conventional method is used together, there is no particular problem. Further, in order to prevent troubles due to device failure or the like, the residual length calculation device 9 is always backed up by the conventional method (remaining length calculation by the conventional method,
The above-mentioned plate thickness is compared with the remaining length calculated based on the winding thickness), and when an abnormal value is found, the one with higher reliability is adopted. That is, the remaining length computing device 9 further obtains the strip running speed by the rotation speed of the roll 4 on which the pulse generator 5 for detecting the rotation speed is installed and the diameter of the roll, and measures by the pulse generator 3 installed on the reel 2. The outer diameter of the coil 1 in the threading is calculated from the calculated number of revolutions, and the number of remaining turns is calculated from the current thickness of the threaded sheet given by a higher-level computer (not shown) and the calculated outer diameter. And the remaining length Lp is calculated. In addition, the rate of change (rate of change) of Lr and Lp is calculated. Then, Lr is compared with Lp, and if the difference between them is within the set range, Lr is given to the deceleration position control device 10. When the difference between the two is out of the set range, the plate thickness given by the higher-level computer and the plate thickness given by the image processing device 8 are compared, and if the latter difference is large with respect to the former, the camera measurement error is displayed. This is notified and Lp is given to the deceleration position control device 10. If the deviation of the changing speed of Lp from the coil rewinding speed (steel plate feeding speed) given by the host computer is large, the camera measurement error is notified and Lp is sent to the deceleration position control device 10. give.

[0015]

According to the present invention, the remaining length can be accurately measured from the number of remaining turns of the coil, and the variation in the remaining length of the coil at the time of completion of deceleration is reduced. In addition, it enables efficient equipment installation because it can reduce the excess capacity of the looper.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a level of one scanning line in an image pickup signal of the television camera 6 shown in FIG.

[Explanation of symbols]

1: coil 2: reel 3: electric motor with pulse generator for reel 4: roll 5: electric motor with pulse generator for roll 6: television camera 7: monitor for monitoring 8: image processing device 9: residual length calculation device 10: deceleration Position control device 11: Line control device 12: TV camera output 13: Plate part 14: Gap part

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication C21D 11/00 105 (72) Inventor Mutsuo Shirakami 20-1 Shintomi, Futtsu-shi Nippon Steel Corporation Company Technology Development Division

Claims (2)

[Claims] 1. In an equipment for continuously rewinding a steel strip from a coil, a device for measuring the number of remaining turns of the coil while rewinding, a calculation device for calculating the remaining length of the coil, and a deceleration target position A coil processing line entry side automatic deceleration control device comprising a deceleration position control device for completing deceleration and a control device for controlling a line speed. 2. A coil processing line input according to claim 1, wherein a television camera and an image processing device having a resolution capable of discriminating the plate thickness of the coil side surface are used as a device for measuring the number of remaining turns of the coil. Side automatic deceleration control device.