JP2004105980A - Method for preventing tumble and drop of coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a preventing method of the tumble and the drop of a coil by which the tumble of a coil, the drop of the coil from a coil truck, telescoping or the like are surely prevented. <P>SOLUTION: When slipping the coil 2 which is loaded on the coil truck 3 on a mandrel 1, the amount of travel of the coil is detected by taking a photograph of the coil edge on the opposite side of the mandrel 1 with a light source 4 and a camera 5 which are arranged oppositely across the coil 2. When difference between this amount of the travel of the coil and the amount of the travel of the coil truck 3 obtained from a host computer exceeds a set value, the coil truck 3 is stopped by judging it as abnormality. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method for preventing a coil from falling and dropping from occurring when inserting a coil placed on a coil cart toward a mandrel and inserting the coil into the mandrel and preventing the coil from falling from the cart.
[0002]
[Prior art]
When a coil is inserted into a mandrel, a method is employed in which the coil is placed on a coil carriage and moved toward the mandrel. However, if the measurement of the coil diameter is defective or the coil is broken in the coil center, etc., the coil will not be inserted into the mandrel well, and if the coil carriage is moved as it is, the coil may fall over or fall off the coil carriage. there were. Such an accident may lead to damage to peripheral equipment.
[0003]
In addition, telescoping (a phenomenon in which a coiled steel sheet is telescopically extruded from the coil center) occurs, in which the tip of the mandrel hits the broken coil starting end and pushes the coil starting end outward from the coil center. (Wandering) There was a possibility that the coil might be defective due to the cause or the occurrence of flaws.
[0004]
For this reason, conventionally, the method of detecting the contact between the mandrel and the coil by detecting the motor load amount of the coil bogie or the method of detecting the load distribution by arranging a load cell on the coil bogie to prevent the coil from falling or falling. Precautionary measures have been taken. However, such a method has a problem that it is not possible to detect telescopic, and also it is not possible to detect a slight inclination of the coil because acceleration / deceleration of the coil carriage affects a load distribution. Further, there is a problem that even if the coil moves in parallel on the carriage, it cannot be detected.
[0005]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems and to provide a coil overturning / falling prevention method which can surely prevent the overturning of the coil, the dropping from the coil carriage, the telescopic, and the like.
[0006]
[Means for Solving the Problems]
The coil overturning / falling prevention method of the present invention made in order to solve the above-mentioned problem is achieved by taking an image of a coil edge opposite to the mandrel with an imaging device when inserting a coil placed on a coil carrier into a mandrel. A coil moving amount is detected, and the coil bogie is stopped when a difference between the detected coil moving amount and the detected coil moving amount exceeds a set value. Note that it is preferable to use a camera and a light source facing each other with a coil interposed therebetween as the imaging device.
[0007]
According to the present invention, unlike the conventional method, the amount of movement of the coil itself is optically detected, so that not only a small inclination of the coil but also a telescopic which could not be detected conventionally can be reliably detected. Moreover, since the detection is performed optically, there is no risk of damaging the coil.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a preferred embodiment of the present invention will be described in detail.
FIG. 1 is a plan view of a device for inserting a coil into a mandrel, FIG. 2 is a front view, and FIG. 3 is a right side view. In this embodiment, the apparatus is a double-type apparatus including two mandrels 1, but it is needless to say that the apparatus may include a single mandrel 1. The coil 2 is placed on the coil carrier 3 and moves toward the mandrel 1 at a speed controlled by the host computer to be inserted into the mandrel 1.
[0009]
In the present invention, the coil movement amount is detected by photographing the coil edge opposite to the mandrel 1 with an imaging device. The imaging device includes a light source 4 and a camera 5 opposed to each other with the coil 2 interposed therebetween. As the light source 4, it is preferable to use a rod-shaped fluorescent lamp extending in the moving direction of the coil 2. Since the position where the light beam is blocked by the coil edge changes with the movement of the coil 2, the camera 5 detects this and measures the movement amount of the coil 2. The light source 4 is arranged at a height near the center of the coil 2 so that telescopic detection can be performed. By obtaining the amount of movement of the coil 2 corresponding to one pixel of the CCD sensor of the camera 5 in advance, the amount of movement of the coil 2 can be accurately calculated.
[0010]
In the present invention, the difference between the movement amount of the coil 2 detected in this way and the movement amount of the coil truck 3 obtained from the host computer is calculated. When the coil 2 is inserted into the mandrel 1 without any trouble, the movement amount L of the coil carriage 3 and the movement amount L of the coil 2 match. However, as shown in FIG. 4, when the coil 2 is not inserted properly into the mandrel 1 and tilts or telescoping occurs, the coil edge opposite to the mandrel 1 does not move, so that the coil 2 is relatively rearward from the normal position. As a result, a displacement occurs between the movement amount L of the coil carriage 3 and the movement amount L + α of the coil 2. Therefore, when the difference between the detected movement amount of the coil 2 and the movement amount of the coil truck 3 exceeds a set value, it is determined to be abnormal and the coil truck 3 is stopped.
[0011]
In this embodiment, an image is taken from the camera 5 at every 10 mm pitch of the movement of the coil carriage 3, the movement of the coil 2 is obtained, and the difference from the movement of the coil carriage 3 is calculated. Then, when the difference exceeds 50 mm, the movement of the coil bogie 3 is stopped because there is a risk of falling or telescoping. This prevents the coil on the coil carrier 3 from overturning and the coil 2 from sliding off the coil carrier 3.
[0012]
Since the position of the coil edge changes depending on the coil diameter, it is preferable to multiply the moving amount of the coil obtained from the image of the camera 5 by a correction coefficient based on the coil diameter. The correction formula X based on the coil diameter is, for example, X = 1800 * (5000 + coil diameter / 2) / (388.8 * 7500).
[0013]
Further, in the embodiment, since the fixed light source 4 and the camera 5 are used, the movement amount of the coil 2 corresponding to one pixel of the camera changes with the movement of the coil carriage 3, so that the coil on the image is changed. The position of the edge and the position of the actual coil edge are shifted as shown in FIG. For this reason, a correction according to the coordinates of the coil carriage 3 is performed. The correction formula Y is, for example, Y = (2.4 * 0.00001 * coil carriage movement ² ) -0.025 * coil carriage movement-5. As a result, as shown in the graph of FIG. 7, the displacement of the distance from the camera to one pixel due to the movement of the coil carriage 3 is corrected.
[0014]
FIG. 5 shows the flow of the present embodiment. When the coil 2 placed on the coil carriage 3 enters the measurement range, the monitoring device determines whether the fluorescent lamp as the light source 4 is normal, and If not, a device abnormality is notified. If the fluorescent lamp is normal, the coil diameter is read from the host computer, and the above-described measurement is started. If the difference in the amount of movement between the coil 2 and the coil carriage 3 exceeds, for example, 50 mm, the movement of the coil carriage 3 is stopped to prevent falling, and the measurement ends. The data at this time is stored.
[0015]
In the above embodiment, the position of the coil edge is detected by the CCD camera. However, it goes without saying that another image pickup device may be used as long as the position of the coil edge can be imaged. Also, the light source 4 is not necessarily limited to a fluorescent lamp, and may be a planar light source.
[0016]
【The invention's effect】
As is apparent from the above description, according to the coil fall / fall prevention method of the present invention, the amount of movement of the coil and the amount of movement of the coil carriage detected by photographing the coil edge on the opposite side of the mandrel with the imaging device are determined. The coil bogie is stopped when the difference exceeds the set value. Can be detected. For this reason, not only can the coil overturn on the coil truck and the coil dropping from the coil truck be reliably prevented, but also a telescoping that could not be detected conventionally can be detected.
[Brief description of the drawings]
FIG. 1 is a plan view of a device for inserting a coil into a mandrel.
FIG. 2 is a front view of FIG.
FIG. 3 is a right side view of FIG. 1;
FIG. 4 is an explanatory diagram of a state where a coil is inclined.
FIG. 5 is a flowchart of the embodiment.
FIG. 6 is a graph illustrating a deviation between a position of a coil edge on an image and an actual position.
FIG. 7 is a graph in which the above deviation has been corrected.
[Explanation of symbols]
1 Mandrel 2 Coil 3 Coil cart 4 Light source 5 Camera

Claims (2)

When inserting the coil mounted on the coil carriage into the mandrel, the coil movement amount is detected by photographing the coil edge opposite to the mandrel with an imaging device, and the detected movement amount of the coil and the movement amount of the coil carriage. A coil bogie is stopped when the difference between the coils exceeds a set value. The method according to claim 1, wherein a light source and a camera facing each other with the coil interposed therebetween are used as the imaging device.

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