JP2514764B2 - Coil end step detection method - 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 a step at the end of a coil, and more particularly to a new improvement for detecting the coil end with high accuracy by detecting the front and back positions of the position above the step at the end of the coil. .

[0002]

2. Description of the Related Art As a conventional method of detecting the step difference of the coil end of this kind, the method disclosed in Japanese Utility Model Laid-Open No. 63-200773 shown in FIG. 3 can be mentioned. That is, what is indicated by reference numeral 3 in FIG. 3 is a needle-shaped probe provided in the casing 2, and the probe 3 is brought into contact with the inner surface of the rolling coil (not shown) to change the electric resistance. The presence or absence of a step at the coil end was detected. Further, as another method, although not disclosed in the literature, a pair of sensors that rotate at the axial center position of the rolling coil is provided, and two distance signals obtained by simultaneously rotating these sensors are compared. Therefore, the presence or absence of a step is detected.

[0003]

Since the conventional method for detecting the step difference at the end of the coil is configured as described above, there are the following problems. That is, in the case of the method shown in FIG. 3, since the measurement is carried out with the probe directly contacting the inner surface, it is extremely difficult to detect it when the rolling coil is large and when it is extremely hot. It was In addition, the probe may be damaged due to the contact method. Further, in the case of detecting only the difference between the two sensors in another conventional example, it is difficult to distinguish from noise such as scratches, and it is difficult to detect the coil end with high accuracy. Further, in the case of a rolled coil or the like, it is difficult to correctly position it on the axis and it is difficult to detect it. The present invention has been made to solve the above problems, and in particular, a coil termination that detects the coil termination with high accuracy by detecting the position above the step of the coil termination and the positions before and after it. It is an object of the present invention to provide a method for detecting a step difference in the above.

[0004]

A method for detecting a step difference at a coil end according to the present invention is a method for detecting a step difference at a coil end of a rolling coil.
A method for detecting a step difference at a coil end, which is configured to be detected by a plurality of sensors including a pair of first and second sensors provided on a rotating body, wherein the sensor is rotated through the rotating body to cause a step difference at the coil end. The upper position is detected and the upper position of the step is set as the upper value of the upper position of the step, and then the front position of the step and the rear position of the step in an equidistant relationship are set with reference to the upper position of the step, and the rotating body is rotated. Then, the step front side length value and the step left rear side length value are obtained from the step front position and the step back position, and based on the step top measurement value, the step front measurement value and the step post measurement value at each position. This is a method of determining that the coil end is genuine only when Y> X and Y> Z.

[0005]

In the method of detecting the step difference at the coil end according to the present invention, first, the sensor provided on the rotating body laterally extends the entire inner circumference so that the step difference at the coil end located on the inner surface of the rolling coil is detected. In order to detect the position and confirm the authenticity of the position above the step, the position before the step and the position after the step from this position above the step are detected, and the measured values at each position are compared to confirm the position above the step. Is going. Therefore, since the judgment is made using the side length values of the step front position and the step back position that are equidistant with respect to the step top position, even if noise factors such as scratches exist on the inner surface, the coil termination Since the center of the coil is detected before and after that, it is possible to distinguish from scratches and adhered dust, and it is possible to detect the presence of the coil end with high accuracy.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the method for detecting a step difference at the coil end according to the present invention will be described in detail below with reference to the drawings.
It should be noted that the same or equivalent parts as those of the conventional example are designated by the same reference numerals for description. 1 and 2 show a method for detecting a step difference at a coil end according to the present invention. FIG. 1 is a block diagram showing a coil end, and FIG. 2 is a block diagram showing a sensor for detecting an inner surface of a rolling coil.

In FIG. 1 and FIG. 2, the reference numeral 1 denotes a rolling coil wound in a cylindrical shape, and the coil end 1A formed on the inner surface 1a of the rolling coil 1 and projecting inward is the rolling coil. It is configured to be detected by the length measuring sensor 3 of the rotating body 4 rotatably arranged at the axial center position of the coil 1.

The rotating body 4 rotates in the direction of arrow A, and the length measuring sensor 3 is composed of, for example, a laser sensor and is a pair of first sensors 3 spaced apart from each other by a distance D.
a and the second sensor 3b, and 4 pairs of sensors 3
Are provided every 90 degrees. It is also possible to rotate the pair of sensors by 360 degrees.

Next, a case will be described in which the coil end 1A of the inner surface 1a of the rolling coil 1 is actually detected in the above configuration. First, when the rotating body 4 is rotated by 90 degrees, one pair of signals from each sensor 3 is output, and when there is a difference in each pair of signals, that is, in FIG. When the distances L ₁ and L ₂ are different,
The presence of the coil end 1A is confirmed.

As described above, when the presence of the coil end 1A is confirmed and the detection of the step candidate detection point is completed, this point is set as the step upper position B, and the step upper position measurement value X is obtained. Next, the step front position A and the step rear position C in the relationship of equidistant (between A and B and B and C are equal) are set with reference to the step above position B, and the rotating body 4 is rotated. A length-measured value Y before the step and a length-measured value Z after the step (smaller than the length-measured value Y by the thickness t) are obtained at the respective positions A and C. The rotating body 4 is composed of a robot and has a well-known means such as an encoder for detecting the rotational position, and is configured so that the rotating body 4 can be rotated at an arbitrary set angle by a motor (not shown). ing.

Next, when the control unit (not shown) determines using the above-mentioned length measurement values X, Y and Z, the length measurement value before step Y
Is normal, only if Y> X, Y> Z,
It is determined that the coil end 1A is genuine. Therefore,
If the conditions are other than this, the program is set so as not to enter the determination mode because it includes noise factors such as scratches, dust, and sagging. That is, scratches,
In the case of dust or the like, since the shape is not constant, Y> X and Y> Z are detected by detecting the side length values of the three points at equal distances described above.
Other than the above, it can be distinguished from the real thing.

In the embodiment described above, the rotary member 4
The case where the sensor 3 provided in the above is configured as a pair of sensors 3a and 3b has been described, but it is also possible to detect using only one sensor, and the pair of sensors 3a and 3b as in the embodiment. It is also possible to use a control unit (not shown) to switch between the case where only one coil is used and the case where two coils are used according to the finishing conditions of the rolling coil 1. In the above-described embodiment, the respective positions (between A, B, and C) are equidistant, but different distances can be similarly detected.

[0013]

Since the method of detecting the step difference at the coil end according to the present invention is configured as described above, the following effects can be obtained. That is, since the true and false of the coil end are determined by detecting the measurement values of three points at equal distances on the step end position, the step end position, and the step end position at the coil end, there is a noise factor such as a scratch. Even if
Compared with the conventional method based only on the difference between the measured values between only two points, the accuracy of the judgment is greatly improved.
Further, even in the case of a rolling coil in a high temperature state, by inserting a rotating body having a sensor as a robot, the work can be greatly automated and highly efficient detection can be performed.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a method for detecting a step difference at a coil end according to the present invention.

FIG. 2 is a configuration diagram showing a detection state by a sensor.

FIG. 3 is a configuration diagram showing a conventional probe.

[Explanation of symbols]

 1 Rolling coil 1A Coil end H Step 3 Sensor 4 Rotating body A Position before step Step B Position above step C Position after step X Measured value on step Y Measured value before step Z Measured value after step

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G01B 21/16 G01B 21/16

Claims (1)

(57) [Claims] 1. A step at the coil end (1A) of the rolling coil (1)
(H) is a pair of first and second sensors (3
In the method for detecting the step difference at the coil end, which is configured to detect by a plurality of sensors (3) composed of a, 3b), the rotating body (4)
The sensor (3) is rotated through to detect the step upper position (B) of the coil end (1A), and this step upper position (B) is set as the step upper position measurement value (X), and then the Position before the step (A) and position after the step in an equidistant relationship based on the position above the step (B)
(C) is set, and the rotating body (4) is rotated to obtain the measured value before step (Y) and the measured value after step (Z) from the position before step (A) and the position after step (C). While obtaining, Y> X and Y> based on the measured value on the step (X), the measured value before the step (Y) and the measured value after the step (Z) at each position (A, B, C). The coil end only for Z
A method for detecting a step at the end of a coil, characterized in that (1A) is determined to be genuine.