JPS60129606A - Method and apparatus for measuring winding shape of coil - Google Patents

Abstract

PURPOSE:To elevate the measuring accuracy of a telescoping value by a method wherein after a telescoping value is obtained from a specified measured distance value at the diametrical position of a coil, an approximation is made on the measured distance value and the diametrical position of the coil by the secondary regression curve to pass a judgement from the square sum of deviation and the curve coefficient thereof. CONSTITUTION:Laser distance meters 22 are arranged as opposed to each other at the lower end face 10A of a coil 10 moving on a conveyor 20 and outputs thereof and output of a pulse transmitter 24 are fed to a microcomputer 28. The computer 28 takes in the outputs of the distance meters 22 at each signal of the transmitter 24 and traces the maximum value thereof to define it as the measured distance value corresponding to the diametrical position of a coil. When the frequency of continuation showing the data exceeding the upper limit of the measuring range is above the set value, the end of measurement is determined. Then, a telescoping value is determined from the measured distance value thus obtained, an approximation is made on the relation between the measured distance value and the diametrical position of the coil by the secondary regression curve to pass a judgement from the square sum of a deviation and the curve coefficient thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for measuring the winding shape of a coil, and is particularly suitable for use in measuring the winding shape of a strip coil such as a hot strip or a cold strip while the coil is moving. The end face of the coil is detected by a distance meter placed opposite the end face of the coil. The present invention relates to improvements in a method and device for measuring the winding shape of a coil, in which the winding shape of the coil is measured from changes in distance in the radial direction.

Generally, the hot strip or cold strip leaving the final rolling mill is wound into a coil shape by a take-up coiler, and then turned over with one end facing down, as shown in Fig. 1, to form a so-called up-end shape. However, the wound coil 1O has winding defects due to various factors, and its axial cross-sectional shape (so-called winding shape) is, for example, as shown in Fig. 2. It has become. This winding shape is one of the important items of coil quality, and it is used to numerically express the quality of one winding. It is represented by a telescopic eel (hereinafter referred to as a telescopic amount) representing a winding (shape) and a winding pattern as shown in FIGS. It will be done. That is, the telescopic amount is, for example, as shown in FIG.
Telescopic adjustment Tp at the full winding position P of O, telescopic amount Tx at the outer winding part X, telescopic adjustment lTy at the middle winding part Y
, is expressed by the telescopic amount TZ at the inner winding portion Z. Typical examples of the winding pattern include a jagged pattern as shown in FIG. 4(A), a convex or concave pattern as shown in FIG. 4(B), and a concave pattern as shown in #I4(C). There are four types, such as the inner type, the square type or the outer type, and the straight type as shown in Fig. 4(D).

Although several methods have been proposed for measuring the telescopic amount and winding pattern as described above, none of them have been put into practical use, and conventionally, measurements have been carried out manually. However, since the temperature of the hot strip coil immediately after winding is as high as about d-5,00°C, it was not possible to get close enough to it, and the determination was made by visual inspection, resulting in poor measurement accuracy.

In addition, Japanese Patent Publication No. 53-15018 proposes a method in which the changing layer of the shape of the coil end face is measured by optical cutting method, and the quality of the shape is measured by pattern recognition. [This method requires a large computer capacity and a large number of cores, and since it uses the optical sectioning method, there are problems in that the accuracy is poor.

In order to solve this problem, the winding shape of the coil and coil can be determined based on the change in the distance from the coil end face in the radial direction of the coil, which is detected by a laser distance meter installed opposite the coil end. However, if the output of the laser rangefinder was used as the distance measurement value, the result would be □ in Figure 5.
The problem is that a large error occurs due to the sampling timing, especially when data is sampled due to the spacing between the strips, making it difficult to accurately measure the telescopic amount and determine the accurate winding shape. It had

In order to solve this problem, for example, in order to determine abnormal data due to gap B, the data sampled this time is compared with the average value of the data sampled several times immediately before, and the difference is calculated. If it is larger than a certain threshold value, it may be considered to be abnormal data due to -B and excluded, but in actual coils 91
If the Tesco amount was quite large, there was a risk that it would be excluded from the data collection that was originally required.

The present invention solves the above-mentioned conventional problems, and as much as possible,
It is an object of the present invention to provide a method and device for measuring the winding shape of a coil mill, which can measure the telescopic amount with high precision, and also easily and accurately determine the winding shape and shape pattern. shall be.

This invention calculates the winding shape of a coil from changes in the radial direction of the coil at a distance from the end face of the coil, which is detected by a distance meter located opposite the end face of the coil. In a method for measuring the winding shape of a coil, the minimum value of the distance meter output is traced to obtain a distance measurement value corresponding to the radial position of the coil, and the distance meter output is equal to or greater than the upper limit of the measurement range. When the coil radial length is greater than or equal to the set value, it is determined that the measurement is complete, and after the measurement is completed, the telescope amount of the coil winding shape is estimated from the distance measurement value that is associated with the coil radial position. At the same time, the Th1M
The relationship between the measured value and the coil radial position is approximated using a quadratic regression curve, and the coil winding shape is determined from the sum of squares of the deviation between the quadratic regression curve and the distance measurement value and the coefficient of the quadratic regression curve. The above objective is achieved by determining the pattern.

The present invention also provides a coil winding shape measuring device in which a coil is disposed opposite to a lower end surface of an up-end coil.
a laser distance meter for detecting the distance to the lower end face of the coil; a moving needle for detecting the amount of relative movement in the radial direction of the coil between the laser distance meter and the coil; and a minimum of the output of the laser distance meter. peak tracing means for tracing a value to obtain a distance measurement value corresponding to the relative movement amount, and the laser; measurement completion determination means for determining that the measurement is completed;
A telescope amount calculation means calculates the telescope amount of the coil winding shape from the distance measurement value after the end of the measurement, and approximates the relationship between the distance measurement value and the relative movement amount using a quadratic regression curve. a regression calculation means that calculates the sum of squares of deviations between the linear regression curve and the distance measurement value and a coefficient of the quadratic regression curve; In addition to the above-mentioned purpose, by providing a pattern determining means for determining the pattern, it is possible to more accurately measure the coil winding shape without being affected by fluctuations.

In the present invention, since the minimum value of the distance meter output is traced to obtain the distance measurement value corresponding to the coil radial position, the coil can be accurately coiled regardless of the roundness of the strip end face or the gap between the strips. The winding shape can be measured. In addition, since it is determined that the measurement is completed when the radial length of the coil whose distance meter output exceeds the upper limit of the measurement range is equal to or greater than the set value, by tracing the minimum value,
This prevents the final value from being held even if the coil runs out. Therefore, an accurate distance measurement value can be obtained, and after the measurement is completed, the telescope amount of the coil winding shape can be adjusted with high accuracy from the accurate distance measurement value associated with the coil radial position. Furthermore, the relationship between the distance measurement value and the coil radial position is approximated by a quadratic regression curve,
the sum of squares of the deviations between the quadratic regression curve and the distance measurement value, 2
Since the pattern of the coil winding shape is determined from the coefficient of the next regression curve and, if necessary, the amount of telescope, the pattern of the winding shape can be determined easily and accurately. Further, if the range finder is a laser range finder and is placed opposite the lower end face of the up-end coil, it is possible to measure the winding shape more accurately without being affected by fluctuations.

With reference to the drawings below, Koi Q- d- An embodiment of the winding shape measuring device will be described in detail.

The first embodiment of the present invention has a conveyor 2 as shown in FIG.
0, the lower end surface 1. A laser distance meter 22 for detecting the distance to the OA, a pulse transmitter 24 for detecting the amount of radial movement of the coil 1O by the conveyor 2O, and a minimum value of the output of the laser distance meter 22 are traced. , the function of the peak trace means to obtain a distance measurement value corresponding to the amount of movement, the number of times the output of the laser distance meter 22 continues to be above the upper limit of its measurement range (when the movement 11 is above the set value, a function of a measurement end determination means for determining that the measurement is over; a function of a φ telescope iim calculation means that calculates the telescope amount of the coil-wound body from the distance measurement value after the end of the measurement, which is associated with the movement amount; The relationship between the measured distance value and the amount of movement is approximated using a quadratic regression curve, and the sum of squares of the deviation between the quadratic regression curve and the measured distance value and the 2
a microcomputer having the function of a regression calculation means for determining the coefficients of the following regression curve, and the function of a pattern determination means for determining the pattern of the coil winding shape from the sum of squares of the deviation, the coefficients and the telescope amount; It consists of 28.

The laser distance meter 22 includes a lens 2 on the surface (lower end surface 10A) of the coil 10, as shown in detail in FIG.
The linear image sensor 22D mainly includes a laser light source 22A for emitting a laser beam 1A''Ij through the coil 2B, and a linear image sensor 22D for receiving the laser beam reflected on the surface of the coil 10 through a lens 22G. Cage, coil 10
For example, if the surface moves from the position of the solid line to the position of the broken line, the laser beam will also move as shown by the broken line, and the incident position on the linear image sensor 22D will change, so the reception of the laser beam will change. The variation in the coil surface, that is, the distance to the surface of the coil 10, is detected from the output of the near image sensor 22D, which changes depending on the position. Distance measurement by this laser distance meter 22 is performed, for example, about 500 times per second.

The operation of the first embodiment will be explained below.

In this first embodiment, the output of the laser distance meter 22 is
Using the signal of the pulse transmitter 24 provided on the conveyor 20, the unit movement end of the coil 10, for example, about 0.5 im, is
Each time, the data is taken into the microcomputer 28. In addition,
When the moving speed of the coil 10 is constant, constant W4
It is also possible to import the data into the microcomputer 28 using 11I. 1c taken into the microcomputer 28
As shown in FIG. 8, first, step 1 is applied to the data.
00, and peak trace processing is performed by tracing its minimum value. This peak trace processing is
As shown in FIG. 5 above, since the end face of the strip is not rectangular but has a rounded edge, it is used to detect only the apex of the edge necessary to accurately fit the telescopic IT.

This is also effective in eliminating scale over in the strip gap B.

Next, proceeding to step 200, the captured data is
Since the number of times -I 1- continues to be equal to or greater than the upper limit of the measurement range of the laser distance meter 22 is greater than or equal to the set value, it is determined that the measurement has ended. This means that, as shown in FIG.
This can be determined from the change in the laser distance meter output data when the fill 10 moves to the top of the coil 10.
This is to clear the final value, which will be retained even if 0 is no longer present.

The peak trace processing 1O0 and measurement end determination processing 2
Specifically, 00 can be executed according to the procedure shown in FIG. 9, for example. That is, first, in step 112, measured values are read. Next, in step 114, the laser distance meter 2
It is determined whether or not the output of step 2 is above the upper limit of the measurement range, that is, scale over. If the determination result is negative, the process advances to iTera 1116 and performs peak trace processing. Then, in step 118, the data is stored, and the process returns to step 112, which continues to be constant. On the other hand, if the determination result in step 114 is positive, that is, if the output of the laser distance meter 22 is the amount of scale over, the process proceeds to step 120, and the number of consecutive scale overs G is counted. do. Then step 122
Then, it is determined whether the number of scale overs G exceeds the setting 11G8 (for example, 25 times). If the determination result is negative, it is determined that the gap is B, and the process returns to step 112 to continue the measurement. On the other hand, if the determination result in step 122 is positive, it is determined that the coil 10 is not present above the laser distance meter 22, and it is determined that the measurement is completed. Therefore, as shown in FIG. 10, the data at the end of the measurement consists of effective data 1 to Ln corresponding to the coil thickness, and peak hold data from n+I to Ln+08 after the inward winding of the coil 10 is completed. become something that

Through this peak trace processing and measurement end determination processing, accurate distance fluctuations in the end face position of the coil 1O can be determined.

□ After determining the end of measurement in step 200, step 3
Proceed to 00 and calculate the telesuff amount. To eliminate this telescopic amount, data 1-b and data 11-un obtained by peak trace processing, as shown in FIG. 10 mentioned above, are used. Specifically, the above-mentioned No. 3
As shown in the figure, the telescopic painter p is defined as the difference in the maximum value within the overall thickness P, the telescopic ITx is defined as the difference between the maximum value and the minimum value within the outer winding part As the difference between the maximum and minimum values of telescope &if"ly, Uchitanibe Z
Calculate teles' lTz as the difference between the maximum and minimum values within.

After completing the Telesph I11 calculation in step 300,
Proceeding to step 400, the winding pattern is determined.

Specifically, as shown in Figure 1.1, first step 41 is performed.
9, the relationship between the distance measurement value and the coil movement amount X is expressed by the quadratic function equation ax2. + bx + c quadratic regression, coefficient a
, b , , c. The process then proceeds to step 412, where the sum of squares S of the deviations of each distance measurement from the quadratic regression curve is calculated.
I put it on. Next, the process proceeds to step 414, and as shown in FIG. 12, the set deviation ± from the quadratic regression curve ax'+bx+c is
By counting the number of pieces of data that are separated by e or more, the number N of peaks within the coil winding (N=12 in the case of FIG. 12) is determined. Then, in step 416, the coefficients a, b, Iff of the quadratic regression curve, the sum of squared differences S,
Number of mountains N and telescope i! With TX and TZ as parameters of the winding shape, for example, by using the tree method, as shown in FIG. 13,
The pattern of the winding shape is determined as follows. In FIG. 13, ao 1S o is a threshold value for determining unevenness, No is a threshold value for determining jaggedness, and Sl(
<So) is the threshold value for other judgments, ■0
is the threshold value for determining external telephony, T: is the threshold value for determining internal telephony, and these thresholds are:
It is determined by the winding shape management contents, that is, the priority of the detected shape pattern and the allowable telescoping amount. Note that the pattern determination tree shown in FIG. 13 is for determining typical patterns; if more detailed classification is desired, a more complex pattern determination tree can be used.

After pattern determination is completed, the process proceeds to step 500, and -10- Output processing is performed.

In this first embodiment, the microcomputer 28
The configuration is simple because all processing is performed within the system.

Next, a second embodiment of the present invention will be described in detail.

As shown in FIG. 14, this second embodiment uses a peak trace in a coil winding shape measurement TiF7II that has a conveyor 20, a laser distance meter 22, a pulse oscillator 24, and a microcomputer 28 similar to those of the first embodiment. The signal processing device 36 that performs processing, measurement, and determination completion determination processing is connected to the laser distance meter 22. and the microcomputer 28, and within the microcomputer 28,
A printer or the like that performs processes other than the peak tracing process and measurement end determination process, connects the microcomputer 28 to the first-hi level computer 40, and displays the -II results and determination results of the microcomputer 28. A display device 42 is provided.

The signal processing device 1136, for example, as shown in FIG. 15, outputs the output of the laser distance meter 17-16-22 outputted at a constant period, or outputs of the laser distance meter 22 sampled at a constant period. The first memory 36A stores
, a second memory 36B that stores the previous data transferred from the first memory 36A, and the current data stored in the first memory 36A. 3.6 Subtract the previous data stored in B, find the difference, and if the difference is negative, send a command signal to store the current value in the third memory 36G that stores minimal data. A subtracter 36C for outputting, a head setting device 36D for setting a threshold value for determining whether or not it is necessary to change the output, and the subtracter 36G.
a comparator 3 that outputs an output change command signal when the output of is larger than the threshold set by the head setter 36D;
6F, and an output control circuit 36F for storing the output data in the fourth memory 36H that stores the output value up to that point when the output change command signal is input from the comparator 3.6E; a third memory 36 for storing the minimum value;
G, a fourth memory 18-36H for storing output values, and an output circuit 36J for outputting the contents of the fourth memory 36H.

Further, when there is an output change command signal output from the comparator 36E, the output control circuit 36F measures time from that point and determines that no output change command signal has been input from the comparator 36E for a set time [S] or more. Sometimes, it has a function of determining that the coil 10 is not above the laser distance meter 22 and clearing the output to zero. The zero-clearing of the output control circuit 36F is released when the next signal 10 starts to be measured.
- This is when the top of the coil of the turn is detected. In addition,
There is no practical problem in using overscale instead of zero clear. □ By using such a signal processing device 36, the output of the laser distance meter 22 as shown by the dashed line F in FIG. 16 can be changed stepwise as shown by the solid line G in FIG. This results in varying distance measurements. Therefore, regardless of the roundness A of the strip end face or the gap B between the strips,
Accurate distance measurements can be obtained. Furthermore, the measured distance value will not change due to a change in sampling timing. FIG. 17 shows a comparison of actual measured values of the output of the laser distance meter 22 and the output of the signal processing device 36.

The operation of this second embodiment is basically the same as that of the first embodiment, but the peak trace processing and measurement end determination processing are performed by the Gogo processing device w36. Furthermore, since the coil movement speed is stable, the signal processing device 36 determines whether the measurement is complete or not by opening the coil when overscaling continues. Furthermore, the determination of the winding shape pattern is performed only at the middle winding portion Y of the coil 10. The sum of squares S of the deviations and the number N of peaks used for determining the winding pattern are calculated as values per unit length and are compared with a threshold value. For this reason, the outer diameter and inner diameter of the coil 10 are inputted from the computer 40 at position L, the expected number of data for the middle winding portion Y is calculated, and the next calculation is performed.

S'-8X (500/expected number of data)...(1)N
--NX (500/expected number of data)...(2) 19
- Using this method, it was possible to measure the amount of telesophage with a measurement accuracy of ±2 fins. In addition, it has become possible to classify winding patterns into about 15 patterns, including jagged, uneven, straight, diagonal, outer telegraphy, and inner telegraphy, with a match rate of approximately 90% with visual determination. These measurement results are displayed on the display device 42.

In this second embodiment, since the signal processing device 36 is independent, the program in the engine computer 28 is simplified. □ As explained above, according to the present invention, there is an excellent effect that a telescope can can be measured efficiently and the winding pattern can be easily and accurately determined. −

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the winding shape of the strip coil, Fig. 2 is a cross-sectional view taken along the If-ff line in Fig. 1, and Fig.
The figure is a degeneracy for explaining the telescopic eel that occurs in the coil, and Figures 4 (A) to ('D) are diagrams showing typical examples of the spiral pattern. , FIG. 5 is a sectional view showing the roundness of the strip and the gap 20-, FIG. 6 is a block diagram showing the configuration of the first embodiment of the coil winding shape measuring device according to the present invention, and FIG.
The figure is a block diagram showing the main configuration of the laser distance needle used in the first embodiment, and FIG. 9 is a flowchart showing in detail the steps of the peak tracing process and measurement end determination process in the processing procedure, FIG. 10 is a diagram showing an example of data at the time of measurement end determination, and FIG. 12 is a flowchart showing details of the procedure of pattern determination processing in the processing procedure, FIG. 12 is a miniature diagram showing the state in which the number of peaks is determined in the pattern determination processing, and FIG. 13 is a flow chart showing the pattern determination processing in the above processing procedure FIG. 14 is a block diagram showing the configuration of a second embodiment of the coil winding shape measuring device according to the present invention, and FIG. 15 is a flowchart showing an example of the pattern determination tree used in the A block diagram showing the configuration of the signal processing device used in the second embodiment, Fig. 16 is a miniature diagram showing the data held by the signal processing device, and Fig. 17 is a block diagram showing the configuration of the signal processing device It is a 4-line diagram comparing an example of the relationship between the input and output of the god. 1O... Coil, 10A... Lower end surface, Tp, Ting X, Ty, Tz... Telescopic amount, 20... Conveyor, 22... Laser distance meter, 24... Pulse transmitter, 28...Microphone viewer, 36...Signal processing device. Agent Takaya Ron (and 1 other person) 23- Fig. 1 Fig. 2 Fig. 3 Fig. 4 (A) (B) (C) (D) m 6≧ -

Claims (2)

[Claims] (1) A method for measuring the winding shape of a coil in which the winding shape of the coil is measured from a change in the distance from the coil end face in the coil radial direction detected by a distance meter placed opposite the coil end face. The minimum value of the distance meter output is traced to obtain a distance measurement value corresponding to the coil radial position, and the coil radial length at which the distance meter output is greater than or equal to the upper limit of its measurement range is set to a set value. When it is more than
It is determined that the measurement is completed, and after the measurement is completed, the coil winding shape and the length of the scope can be requested from the distance measurement value associated with the coil radial position, and the relationship between the distance measurement value and the coil radial position can be calculated. 'Approximate calculation using a quadratic regression curve,
A coil winding shape measuring method characterized in that a coil winding shape pattern is determined from the quadratic regression curve, the sum of squares of the deviation of the distance measurement value, and a coefficient of the quadratic regression curve.゛ (2) A laser distance meter for detecting the distance to the lower end surface of the coil, which is placed opposite to the lower end surface of the up-end coil, and a radial direction of the coil between the laser distance meter and the coil. a moving needle for detecting the amount of relative movement; a peak tracing means for tracing the minimum value of the output of the laser distance meter to obtain a distance measurement value corresponding to the amount of relative movement;
measurement end determination means that determines that the measurement has ended when the relative movement amount for which the output of the laser distance meter is greater than or equal to the upper limit of the measurement range is greater than or equal to a set value; and measurement end determination means that is associated with the relative movement amount. A telescope amount calculation means calculates the telescope amount of the coil winding shape from the distance measurement value, and approximates the relationship between the distance measurement value and the relative movement amount using a quadratic regression curve, and calculates the quadratic regression. regression calculation means for calculating the sum of squares of deviations between the curve and the distance measurement value and the coefficients of the quadratic regression curve; and from the sum of squares of the deviations, the coefficients and the telescope bag;
A coil winding shape measuring device comprising: pattern determination means for determining a pattern of a coil winding shape.