JP2698047B2 - Detecting method of strip tip position in coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting the position of the leading end of a strip in a coil formed by winding the strip.

[0002]

2. Description of the Related Art For example, in rolling a steel strip or an aluminum strip, a rolled strip is wound into a coil. The rolling of the strip will be described. A slab having a thickness of several hundred mm is gradually reduced in thickness by rolling, and in the extreme, a product of several μm can be obtained. In this case, the steps after the normal hot rolling are wound up as a coil and transported to the next step. And
As shown in FIG. 5, when the mandrel 11 is rotated to wind the strip 1 into a coil shape, a step 3 is inevitably generated on the outer peripheral surface of the coil 2 in a portion where the tip 1 a of the strip 1 exists. I do.

[0003] At present, as shown in FIG.
Are wound around the outer peripheral surface of the mandrel 11. The blocker roll 12 is provided with a rotating arm 1 provided so as to be rotatable around a pivot 14 in a direction approaching and separating from the mandrel 11.
3 and the rotating arm 13 is provided with a hydraulic cylinder 15
Driven by By rotating the rotating arm 13 in a direction approaching the mandrel 11 by the hydraulic cylinder 15, the roll 12 comes into contact with the outer peripheral surface of the coil 2 and rotating the rotating arm 13 in a direction away from the mandrel 11. The blocker roll 12 is separated from the outer peripheral surface of the coil 2.

[0004] The tip 1a of the strip 1 is
1, the roll 12 is pressed into contact with the roll 12 over its several turns until the strip 1 is firmly wound around the mandrel 11.

When the coil 2 is rotated while the strip 1 is being wound, the portion where the tip 1a of the strip 1 is located, that is, the step 3 passes each time the coil 2 makes one rotation. Here, if the blocker roll 12 is kept in pressure contact with the outer peripheral surface of the coil 2, every time the step 3 on the outer peripheral surface of the coil 1 passes through the blocker roll 12, it comes into strong contact with the blocker roll 12, and May have scratches (top marks) on the surface. For this reason, each time the portion of the coil 2 where the tip 1 a of the strip 1 is located, that is, the portion of the step 3 rotates on the blocker roll 12, the rotating arm 13 is rotated in a direction away from the mandrel 11. The blocker roll 12 is separated from the outer peripheral surface of the coil 1 to temporarily avoid the portion where the tip 1a of the strip 1 is located, that is, the portion of the step 3.

However, the blocker roll 12 is separated from the outer peripheral surface of the coil 1 every time the portion of the coil 2 where the tip 1a of the strip 1 is positioned, that is, the step 3 is rotated by the blocker roll 12. If the operation of avoiding the leading end of the strip is not performed normally, the quality of the coil 2 will be poor due to the top mark.

Therefore, the tip 1 of the strip 1 of the coil 2
a, that is, the position of the step 3 in the rotation direction is accurately detected,
By controlling the position of the blocker roll 2 accordingly, the occurrence of surface scratches on the surface of the strip 1 can be prevented, and the life of the winding device can be extended by reducing the impact load.

In addition, when transporting to the next process after rolling, unless the position of the tip 1a is detected and properly controlled, the tip is drooped due to the impact at the time of handling and the winding is loosened, which causes surface scratches. Becomes Also in this regard, it is important to accurately detect the position of the tip 1a of the strip 1, that is, the position of the step 3 in the rotation direction.

Conventionally, the tip 1a of the strip 1, ie, the step 3
As a method of detecting the position in the rotational direction of the slab, as shown in FIG. 7, a laser irradiator 16 detects the tip 1a of the sash 1 and a signal of a pulse generator 18 interlocked with a pinch roll 17 for conveying the sash 1 There is proposed a method of measuring the moving distance of the strip 1 to track the tip 1a of the strip 1, that is, the step 3.

[0010]

In the conventional method described above, in order to detect the position of the tip 1a of the strip 1, a precise device such as a laser irradiator 16 and a pulse generator 18 is used for detection. I have. However, devices provided near these mandrels 11 are blocker rolls 1.
2 may be damaged due to the impact of the pivoting operation of the pivoting arm 13 to which the device 2 is attached, and these devices may receive heat or oxides from the strip 1 due to a poor environment. In some cases, reliability and durability may be impaired. Therefore, there is a problem that it is difficult to improve the reliability and durability of the device used for detecting the strip end and to detect the strip end position with high reliability for a long period of time.

The present invention has been made in view of the above circumstances, and an apparatus used for detecting the position of a strip end of a coil is provided with a device which is provided with a mandrel for supporting the coil, and which is not affected by an impact caused by a bad environment due to an impact. It is an object of the present invention to provide a method of detecting a position of a strip front end in a coil which can avoid a long time and reliably detect a position of a front end of a strip.

[0012]

In order to achieve the above object, a method of detecting the position of the end of a strip in a coil according to the present invention comprises:
A light beam is irradiated on the outer peripheral surface of the coil formed by winding the band plate,
Observe the state of the outer peripheral shape of the coil by photographing the light source image on the outer peripheral surface of the coil, and observe the change in the state of the light source image with the change in the outer peripheral shape of the coil due to the presence of the tip of the strip. The position of the tip of the strip is detected by utilizing the position.

[0013]

When the rolled strip is wound into a coil, a light source irradiates a light beam to the outer peripheral surface of the coil, and a light source image on the outer peripheral surface of the coil is photographed by a camera to check the position of the light source image. Observe the state of the outer peripheral shape of the coil.

In the outer peripheral shape of the coil, portions other than the portion where the end of the strip exists are in a perfect circle. However, the outer peripheral shape of the coil where the end of the band plate exists is slightly shifted from a perfect circle. For this reason, the state of the light beam reflected on the outer peripheral surface of the coil in the portion where the leading end of the band plate exists differs from the state of the light beam reflected on the outer peripheral surface of the coil in the portion where the leading end of the band plate exists. This makes it possible to detect the presence of the end of the strip in the coil.

Specifically, the position of the virtual image of the light source at the portion where the tip of the strip exists is shifted by an angle corresponding to the coil tangent angle due to the deviation of the portion where the tip of the strip exists from a perfect circle. When the position of the light source image is viewed over time, the displacement of the light source image has a peak at a position corresponding to the end of the strip once per rotation (one rotation) of the coil. Therefore, the band tip position can be detected by obtaining this peak position with respect to the rotation angle of the mandrel. Therefore, the position of the leading end of the strip can be detected quickly and reliably, and as a result, damage to the strip in the coil due to the blocker roll can be prevented.

The light source for irradiating the coil with a light beam to detect the end of the strip and the camera for taking a light source image of the coil can be provided separately from the mandrel supporting the coil. It is not affected by a bad environment around a device having a mandrel such as a picking device or an impact generated from the vicinity of the device.
Therefore, the reliability and durability of the device used for detecting the leading edge of the strip can be enhanced, and highly reliable detection of the leading edge position of the strip can be performed for a long time.

[0017]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory view showing one embodiment of the method of the present invention. In carrying out the method of the present invention, the following equipment is prepared. The mandrel 11 is rotated by a motor (not shown) to wind up the strip 1 and form the coil 2. In this coil 2, a step 2 is formed in the outer peripheral shape at a portion where the tip 1 a of the strip 1 is located.

In carrying out the method of the present invention, the following equipment is prepared. The mandrel 11 is rotated by a motor (not shown) to wind up the strip 1 and form the coil 2. In the vicinity of the mandrel 11, a light source 21 for irradiating a light beam on the outer peripheral surface of the coil 2 and a camera 22 for photographing a light source image on the outer peripheral surface of the coil 2 are provided. Examples of the light source 21 include a halogen light, a fluorescent light, a sodium lamp, and the like.
Examples of the camera 22 include a CCD (solid-state image sensor) camera, a vidicon camera, and an optical position detection element (Position S).
Detecting: PSD). The light source 21 and the camera 22 observe the state of the outer peripheral shape of the coil 1 to detect the position of the tip 1a of the strip 1, and are provided on a horizontal line passing through the center of the mandrel 11. Further, a pulse transmitter 23 for detecting the rotation angle is connected to the rotation shaft of the mandrel 11.

A case where the tip 1a of the strip 1 in the coil 2 is detected by the method of the present invention will be described.

A light source 21 irradiates a light beam onto the outer peripheral surface of the coil 2, and a light source image reflected on the surface of the coil 2 is captured by a CCD camera 22.
To shoot.

As shown in FIG. 2, the outer peripheral shape of the coil 2 is a perfect circle except for the portion where the tip 1a of the strip 1 exists. However, as shown in FIG. 3, the outer peripheral shape of the coil 2 in the portion where the tip of the strip 1 exists is slightly shifted from a perfect circle. For this reason, the state of the light beam reflected on the outer peripheral surface of the coil 2 in the portion where the tip 1a of the strip 1 exists is different from the state of the light beam reflected on the outer peripheral surface of the coil 2 in the portion where the tip of the strip 1 exists. Make a difference. Thus, the presence of the tip 1a of the strip 1 in the coil 2 can be detected.

That is, as shown in FIG. 3, the position of the virtual image of the light source 21 at the portion where the tip 1a of the strip 1 exists is determined by the deviation of the portion where the tip 1a of the strip 1 exists from the true circle. The angle is shifted by the angle corresponding to the angle. The amount of the deviation D is D = (2 · L · h · sin θ · cos θ) / (L
+ H).

Here, L is the distance between the light source 21 and the outer peripheral surface of the coil 2, and h is the distance between the camera 22 and the outer peripheral surface of the coil 2.

The coil 2 winds the strip 1 and makes one rotation (1
Each time the edge of the band plate 1 is
Pass in front of. Therefore, the light from the light source 21 is
During one rotation, the tip of the strip 1 exists on the outer peripheral surface of the coil 2 and the outer peripheral shape is not a perfect circle, and the part where the distal end of the strip 1 does not exist and the outer peripheral shape is a perfect circle is irradiated. The camera 22 has a light source image at a portion where the tip 1a of the strip 1 of the coil 2 is present and the outer shape is not a perfect circle, and a light source image at a portion where the tip 1a of the strip 1 is not present and the outer shape is a perfect circle. To shoot.

The camera 22 sends the photographed image to an image processing circuit 24, which processes the image.
The image processed by the image processing circuit 24 is represented by a diagram shown in FIG. According to FIG. 4, the position of the light source image is indicated by the passage of time (time change of the light source image position), and the change of the light source image for each rotation of the coil 2 is continuously shown. According to this diagram, it can be seen that the light source image position changes at the portion where the tip 1a of the strip 1 is located in one rotation of the coil 2. That is, the displacement of the light source image has a peak at a portion corresponding to the tip 1a of the band plate 1 once per rotation (one rotation) of the coil 2.

Then, as the winding of the strip 1 progresses and the diameter of the coil 2 increases, the change in the position of the light source image gradually decreases accordingly. This indicates that the influence of the tip 1a of the strip 1 becomes smaller due to the influence of the rigidity of the strip 1 as the winding progresses. In this case, since the winding is performed while keeping the peripheral speed of the strip 1 constant,
The time interval between the peaks of the light source image gradually increases.

The image processing circuit 24 outputs a signal of the processed image to the tip position detecting circuit 25. Tip position detection circuit 2
In 5, the moving peak of the light source image in each rotation of the coil 2 is detected. On the other hand, the pulse transmitter 23 detects the rotation angle of the mandrel 11, that is, the rotation angle of the coil 2, and outputs a detection signal to the tip position detection circuit 25. The tip position detection circuit 25 receives the signal from the pulse transmitter 23, stores the rotational position of the mandrel 11 indicating the peak position of the light source image, and combines this storage with the detection of the moving peak of the light source image described above to obtain a coil. 2 can detect the position of the tip of the strip 1. That is, the position of the tip 1a of the strip 1 can be detected by determining the peak position of the light source image with respect to the rotation angle of the mandrel 11.

Then, around the coil 2, the coil 2
Are provided, and the position of each blocker roll is controlled in accordance with the detected tip 1a of the strip 1 to prevent the occurrence of surface scratches on the strip 1. The blocker roll is shown in FIG.
Are provided by the configuration shown in FIG. That is, as shown in FIG. 7, the blocker roll 12 is attached to the tip of a turning arm 13 supported on a pivot 14, and the turning arm 13 is turned by a hydraulic cylinder 15.

Normally, the rotation arm 13 rotates in a direction approaching the coil 2 and the blocker roll 12 contacts the outer peripheral surface of the coil 2. Then, when a portion of the outer peripheral surface of the coil 2 facing the tip 1a of the strip 1 approaches a position where the blocker roll 12 is in contact, the tip position detection circuit 25 detects the tip position and the position is shown in FIG. Is given to the cylinder drive circuit 26 as described above. The cylinder drive circuit 26 drives the hydraulic cylinder 15 to rotate the rotating arm 13 in a direction away from the coil 2 to separate the blocker roll 12 from the outer peripheral surface of the coil 2. For this reason,
The portion of the outer peripheral surface of the coil 2 where the tip 1a of the strip 1 is located, that is, the step 3 and the blocker roll 12 can be prevented from being damaged. After the portion of the outer peripheral surface of the coil 2 facing the tip 1a of the strip 1 has passed, the rotating arm 13 is again rotated to bring the blocker roll 12 into contact with the outer peripheral surface of the coil 2.

Further, by reducing the impact load, it is possible to extend the life of the winding device provided with the mandrel 11 for winding the strip 1 into a coil shape. Furthermore, by correctly detecting and controlling the position of the leading end 1a after the winding of the strip 1, the loosening of the leading end of the coil can be prevented.

In the above-described embodiment, a basic example of the method of the present invention has been described. However, if the environment is large due to the surrounding environment where the coil winding device is installed, this optical disturbance is Since it adversely affects the accuracy of detecting the position of the front end, it is necessary to devise a method of removing the influence. The following method is mentioned as the method.

The first method is to use the average value or the mode value of the detection results for several rotations instead of finding the tip position in one rotation. The second method is a method of reducing noise due to optical disturbance by superimposing the positions of the light source images for each rotation of the coil 2 in synchronization with the rotation of the coil 2 as shown in FIG. That is, FIG. 6A is a diagram illustrating a temporal change of the light source image, and FIG. 6B is a diagram illustrating the coil 2 illustrated in the diagram of FIG.
3 shows a state in which the light source images in each rotation are superimposed to reduce noise.

The third method is as follows. The noise inherently generated in the coil winding device by the rotation of the mandrel 11 has a specific tendency depending on the rotational position.
Therefore, the tendency is obtained in advance, and a circuit that removes the tendency from the obtained tendency data is added.

The present invention is not limited to the above-described embodiment, but can be implemented with various modifications. For example, the above-described embodiment shows an example of application in a winding device provided with a mandrel that winds a strip in a coil shape.However, the present invention is not limited to this. A similar method can be implemented in an apparatus.

[0036]

As described above, according to the method for detecting the end position of the strip in the coil according to the present invention, the light is radiated to the outer peripheral surface of the coil formed by winding the band, and the light source on the outer peripheral surface of the coil is irradiated. Observe the state of the outer peripheral shape of the coil by taking an image, and detect the position of the tip of the strip using the change in the state of the light source image accompanying the change in the outer peripheral shape of the coil caused by the presence of the tip of the strip By doing so, the tip position of the strip can be detected quickly and reliably, and as a result, damage to the strip in the coil by the blocker roll can be prevented.
A light source for irradiating light to the coil and a camera for capturing a light source image of the coil for detecting the tip of the strip can be provided separately from the mandrel supporting the coil. It is not affected by the bad environment around the device equipped with the mandrel or the impact generated by the device. Therefore, the reliability and durability of the device used for detecting the leading edge of the strip can be enhanced, and highly reliable detection of the leading edge position of the strip can be performed for a long time.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing one embodiment of a detection method of the present invention.

FIG. 2 is an explanatory diagram showing a case in which a light source image is taken at a portion where a strip end of a coil does not exist in the embodiment.

FIG. 3 is an explanatory diagram showing a case in which a light source image is captured at a portion where a strip end of a coil exists in the embodiment.

FIG. 4 is a diagram showing a temporal change of a light source image in the embodiment.

FIG. 5 is a front view showing a coil.

FIG. 6 is a diagram showing a method for reducing noise due to optical disturbance.

FIG. 7 is an explanatory diagram showing an example of a conventional detection method.

[Explanation of symbols]

1. Strip plate. 1a: Strip end, 2: Coil, 11: Mandrel, 21: Light source, 22: Camera, 24: Image processing circuit, 24: Tip position detection circuit.

Claims (1)

(57) [Claims] 1. An outer peripheral surface of a coil formed by winding a band plate is irradiated with a light beam, a light source image on the outer peripheral surface of the coil is photographed to observe a state of an outer peripheral shape of the coil, and a state of the outer peripheral shape of the coil is observed. Detecting the position of the tip of the strip using a change in the state of the light source image accompanying a change in the outer peripheral shape of the coil caused by the presence of the tip, detecting the position of the tip of the strip in the coil. Method.