JP2003097923A - Method for measuring coil winding form and apparatus used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for measuring a coil winding form with a high speed, and also provide the apparatus used for the same. SOLUTION: A plurality of linear scanning type distance meters are arranged in one line so as to cover the end surface of a coil from the inner diameter side to the outer diameter side, individually, and also the distance distribution to the desired end surface of the coil is simultaneously measured with the linear scanning type distance meters, so that the coil form is measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to measurement of a coil winding shape, and particularly preferably, it is possible to quickly and highly improve a winding shape disorder of a telescope or the like which is generated in a coil wound with a metal strip such as a steel strip. The present invention relates to a coil winding shape measuring method and apparatus that enable accurate measurement.

[0002]

2. Description of the Related Art Usually, a metal strip such as a steel strip is wound around a coil and stored / conveyed after a process such as rolling is completed. At this time, as shown in FIG. 4, when the coil 1 is disturbed by the winding of the telescope 1a or the like, it hinders the carrying work using a crane or the like, and the coiling disordered portion of the coil end face during the coil handling. Problems such as ear breakage occur.

Particularly in product coils such as cold-rolled steel strip coils and surface-treated steel strip coils, the coil shape is one of the important qualities, and the coil is wound accurately and is flat. Is required. Therefore, conventionally, various methods for measuring the winding shape of the coil have been proposed.

A typical method of measuring the conventional coil end face shape will be described with reference to FIG. First, FIG. 5A is a schematic diagram for explaining the measurement principle of the laser rangefinder 7.
The spot light projected from the laser projecting element 7a is reflected by the distance measuring surface 7g, and this reflected light is received by the PSD (Position Sensitive Light Detector) 7c via the light receiving lens 7b. , Its position is detected. Then, the movement distance of the distance measuring surface 7g is calculated by performing a calculation based on a simple triangulation method from the change of the light receiving position on the PSD 7c.

The conventional coil end face shape measurement is carried out, for example, by
As shown in FIG. 5B, this laser range finder 7 is attached to the lifting mount 6 to scan the end face of the coil 1.
Then, the scanned distance distribution is replaced with the shape of the end face of the coil for measurement. Note that FIG.
In (b), a method of vertically scanning with the elevating device is illustrated, but the invention is not limited to this, and substantially the same measurement result can be obtained even when scanning in the horizontal direction or the diagonal direction. This is because the coil 1 is formed by winding a metal band from the inner diameter side to the outer diameter side, and is wound with a substantially central point symmetry.

Further, for example, in Japanese Unexamined Patent Publication No. 9-26310, "Laser rangefinders are arranged at positions separated by a predetermined distance from both end faces of the coil, and the laser rangefinder and the both end faces of the coil are separated from each other. Measure the distance between each, obtain a reference value from the measured distance data, the difference between the reference value and the measured distance as a telescope, using only the telescope amount of the distance shorter than the reference value The method for measuring the winding shape of the coil is disclosed.

In this method, the laser (-) of one-point measurement type is used.
By arranging the rangefinders on both end faces of the coil and moving the coil or the laser (-) rangefinder, the winding shape of the coil is measured. On the other hand, as a method of measuring the coil winding shape without using the relative movement between the coil and the measuring device, a coil winding shape measuring method to which an image processing technique as described in JP-A-9-14933 is applied is also proposed. .

In Japanese Patent Laid-Open No. 9-14933, "A spot light emitted from a laser light source is one-dimensionally scanned and irradiated on a coil end face by a scanning device, and the reflected light is imaged by a one-dimensional photoelectric conversion means. The one-dimensional captured image is converted into a digital signal and stored in the image storage circuit. The image signal is image-processed and input to the spot light irradiation position extraction circuit to extract the spot light irradiation position, and the spot light irradiation position (reflection position)
(X, y) of the coordinates are extracted by the coordinate point calculation circuit, the coordinate group is stored in the coordinate point storage circuit, and the scanning position is detected by the calculation position detection circuit under the control of the calculation control circuit to scan device control circuit. Drive the scanning device based on
It is disclosed that the coil end surface shape is measured by one-dimensional scanning of spot light.

In this method, spot light is irradiated onto the coil end face, the spot light scanning position and the spot light reflection position are detected, and the two-dimensional position of the coil end face is calculated based on these to determine the coil end face shape. I'm measuring.

[0010]

However, in the method shown in FIG. 5 and the method described in Japanese Patent Laid-Open No. 9-26310, the relative movement time of the rangefinder determines the measurement time, and the measurement time is limited. Will be long. Further, since a moving mechanism is required, its mechanical rattle has a great influence on the measurement accuracy, and a sufficient accuracy cannot be ensured.

On the other hand, in the method disclosed in Japanese Patent Laid-Open No. 9-14933,
Since the scanning range is wide, it is necessary to install the spot light source at a certain distance from the end face of the coil, and the spot diameter becomes wider. In addition, there is a problem in that the accuracy of measurement deteriorates because there is a portion where the laser light cannot be radiated because the projection such as the winding disordered portion of the coil end face forms a shadow in the vicinity thereof.

The present invention solves the above problems and makes it possible to measure the shape of the coil end face instantaneously and with high accuracy by eliminating the need for relative movement of the measuring device.

[0013]

The present invention has solved the above-mentioned problems by the method and apparatus for measuring coil winding shape described below. A plurality of linear scanning rangefinders are arranged in a line so as to cover the coil end surface from the inner diameter side to the outer diameter side, and the linear scanning rangefinder measures the distance to the coil end surface. A coil winding shape measuring method, characterized in that the winding shape of the coil end face is measured by simultaneously measuring the distribution. Performing measurement using a dummy measurement target, calculating the average distance in the individual distance distribution of the plurality of linear scanning rangefinders, the average distance between them so that the variation in the average distance is minimized. The coil winding figure measuring method as described above, further comprising a calibration step of performing matching and correction. A plurality of linear scanning distance meters arranged in a row so as to share and cover the measurement from the inner diameter side to the outer diameter side of the coil end surface, and individual distances measured by the linear scanning distance meter A coil winding shape measuring device comprising: a signal processing unit that calculates the winding shape of a coil based on a distribution signal; and an output unit that outputs the winding shape of the coil calculated by the signal processing unit. Based on a distance distribution measured using a dummy measurement target, a correction data storage unit for storing correction data for performing correction by matching the individual average distances of the linear scanning rangefinder, The coil winding shape measuring device as described above, wherein the processing unit is a signal processing unit that calculates the winding shape of the coil based on the correction data.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention will be described with reference to FIGS. First, a linear scanning range finder 3 which is a range finder applied to the present invention will be described with reference to FIG. The principle of distance measurement itself has already been described with reference to FIG. 5, but in the linear scanning range finder 3 applied to the present invention, the distance measuring surface 3g is linearly scanned and the distance distribution of the scanned range is measured. It is characterized in that it can measure. Therefore, the linear scanning range finder 3 itself can be fixed without moving and the distance distribution in a certain range of the measurement target surface can be obtained.

In the linear scanning type distance meter 3, a laser projecting element is used.
The laser light projected from 3a is linearly scanned by a scanner (scanner) 3b. In addition, a part of the scan light passes through the half mirror 3c and PSD3d in the X direction.
The light is received by and the scan position is detected. Half mirror
The remaining scan light that has passed through 3c is projected in a one-dimensional linear form on the measurement target surface 3g. The reflected light is received by the Z direction PSD 3f via the light receiving lens 3e. This Z direction PSD
It is possible to calculate a linear distance distribution on the distance measuring surface 3g from the light receiving position on 3f and the scan position obtained from the PSD 3d in the X direction.

According to the present invention, as shown in FIG. 1, a required number of the above linear scanning rangefinders 3 are arranged from the inner diameter side to the outer diameter side of the end surface of the coil 1 and the measurement is performed at the same time. The moving mechanism is not necessary, and the shape of the coil end surface can be measured at once. The measurement data from the required number of linear scanning distance meters 3 is processed by the signal processing device 4 and displayed on the output device 5 as coil end surface shape data. The matching data storage unit 4a and its matching data processing will be described later.

The number of linear scanning rangefinders 3 to be installed is appropriately determined according to the required accuracy of measuring the winding shape of the end face of the coil 1. In particular, when high-precision measurement is required, it is necessary to increase the scanning resolution of the linear scanning range finder 3, so that it is necessary to relatively increase the number of installed units. Further, in order to increase the resolution, it is necessary to make the distance between the linear scanning range finder 3 and the end surface of the coil 1 as close as possible. Therefore, when the shape of the coil winding, for example, the size of the telescope is large, there is a high risk that the end surface of the coil 1 comes into contact with the linear scanning distance meter 3.

From the above, when high-precision measurement is required, in order to avoid the above-mentioned dangers before the main measurement, for example, rough preliminary measurement processing or visual confirmation by the operator is performed. It is preferable to carry out the processing of. Further, more preferably, it is preferable to remove a coil having a large telescope from the measurement object of the present invention in advance.

If a plurality of linear scanning rangefinders 3 are used to measure the shape of the end face of the coil 1, the measurement range is equivalent to the radius of one end face of the coil 1 from the inner diameter side to the outer diameter side. It is enough. This is because the coil 1 is wound symmetrically about the center point, and the convex portion on one side surface becomes a concave portion at the corresponding position on the opposite side. However, in order to improve the measurement accuracy, it goes without saying that the linear scanning range finder 3 may be arranged so as to measure the diameter equivalent to the end surface on one side of the coil, or may be arranged so as to measure both end surfaces. Yes.

By the way, according to the present invention, a plurality of linear scanning rangefinders 3 are arranged side by side, and the shape measurement is performed by simultaneously measuring the end faces of the coils. Due to the mounting error, instrumental error, etc., the measured distance distribution may vary as shown in FIG. 3A, and matching may not be achieved, which may cause a problem. Therefore, in the present invention, it is preferable to measure a dummy measurement target before the main measurement and perform a correction process for matching variations between the linear scanning rangefinders from the measured values. As the dummy measurement target, it is preferable to use a flat calibration plate having a substantially equal distance from each linear scanning range finder, for example, a dummy coil confirmed to have a substantially uniform winding shape, or the like.

As the correction processing for matching, for example, as shown in FIG. 3 (b), it is preferable that the average distances of the distance distributions measured by the respective linear scanning distance meters are matched and matched. And Then, the correction data (matching data) thus obtained is stored in the matching data storage unit connected to the signal processing unit of the coil winding shape measuring apparatus, and correction is performed during the main measurement. By performing the correction process in this way, highly accurate measurement can be realized even when a large number of linear scanning rangefinders are arranged side by side for simultaneous measurement.

The present invention is suitable for measuring the coil shape of a cold-rolled steel sheet, but the present invention is not limited to this, and if heat countermeasures against high-temperature radiant heat are sufficiently taken, the heat It goes without saying that it can also be applied to an extended coil.

[0023]

EXAMPLE A coil winding shape measuring apparatus of the present invention shown in FIG.
The measurement times of the conventional coil winding shape measuring apparatus shown in FIG. 5 (b) were compared. The object to be measured is a cold rolled coil with an outer diameter of the coil of about 2500 mm, an inner diameter of the coil of about 500 mm, and a plate thickness of 0.3 to 1.8 mm, and its telescope amount is ± 10 mm at maximum.
Larger telescope coils have been visually rejected in advance.

In the coil winding shape measuring apparatus of the present invention, 20 linear scanning distance meters are arranged side by side and the measurement accuracy is 0.5 mm. On the other hand, the conventional coil winding shape measuring device has a scanning speed of 20 mm / sec and a measurement accuracy of about 1 to 2 mm. In both measuring devices, it is necessary to bring the distance meter close to the coil end surface after the coil is loaded, and separate it from the coil end surface after the measurement is completed. If this separation distance is 600 mm and the moving speed is 20 mm / sec, both devices require 30 seconds for the approach processing before measurement and 30 seconds for the separation processing after measurement, that is, a total of 60 seconds.

Here, in the coil winding shape measuring device of the present invention, the measurement itself is completed almost instantaneously, whereas in the conventional coil winding shape measuring device, the coil end face is scanned approximately.
It requires 50 seconds (1000 mm ÷ 20 mm / second). That is, while the conventional coil winding shape measuring apparatus requires about 2 minutes for one measurement, the coil winding shape measuring apparatus of the present invention requires about 2 minutes.
It is possible to complete one measurement in 60 seconds, which is clearly a speedup.

[0026]

As described above, according to the present invention, it is possible to perform the measurement without the need for the relative movement of the measuring unit, and it is possible to measure the coil winding shape at a high speed. Therefore, it is possible to measure the coil end face loaded on the coil carriage while the coil carriage is moving. Further, since the number of linear scanning rangefinders can be freely set according to the desired measurement accuracy, extremely high accuracy measurement can be realized while maintaining high speed measurement.

[Brief description of drawings]

FIG. 1 is a schematic view showing a coil winding shape measuring device of the present invention.

FIG. 2 is an explanatory diagram of the principle of a linear scanning range finder applied to the present invention.

FIG. 3 is a waveform diagram illustrating a measurement data matching method applied to the present invention.

FIG. 4 is a perspective view showing a telescope generated on an end surface of a coil.

FIG. 5 is a schematic diagram illustrating a conventional coil winding shape measuring method.

[Explanation of symbols]

1 coil 1a telescope 1b winding disorder part 2 mounts 3 linear scanning rangefinder 3a Laser projector 3b scanner 3c half mirror 3d X direction PSD (optical position detector) 3e light receiving lens 3f Z direction PSD (optical position detector) 3g distance measuring surface 4 Signal processing unit 4a Matching data storage 5 Output device 6 Lifting stand 7 Laser rangefinder 7a Laser projector 7b light receiving lens 7c PSD (optical position detector) 7g Distance measuring surface

Claims (4)

[Claims] 1. A plurality of linear scanning distance meters are arranged so as to cover and cover from the inner diameter side to the outer diameter side of the coil end surface.
A coil winding shape measuring method, wherein the winding shape of the coil end surface is measured by simultaneously measuring a distance distribution to the coil end surface by the linear scanning range finder arranged in rows. 2. A measurement is carried out using a dummy measurement target to calculate an average distance in each distance distribution of the plurality of linear scanning rangefinders, so that variation in the average distance is minimized. The coil winding figure measuring method according to claim 1, further comprising a calibration step of performing a correction by matching the average distances thereof. 3. A plurality of linear scanning rangefinders arranged in a row so as to share and cover the measurement from the inner diameter side to the outer diameter side of the coil end surface, and the linear scanning rangefinder. A coil winding pattern having a signal processing unit for calculating the winding pattern of the coil based on the measured individual distance distribution signal and an output unit for outputting the winding pattern of the coil calculated by the signal processing unit. measuring device. 4. A correction data storage unit for storing correction data for performing correction by matching individual average distances of the linear scanning rangefinder based on a distance distribution measured using a dummy measurement target. The coil winding shape measuring device according to claim 3, wherein the signal processing unit is a signal processing unit that calculates the winding shape of the coil based on the correction data.