JPH02643B2 - - Google Patents

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. 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 the distance from the coil end face in the coil radial direction detected by a distance meter placed opposite the coil end face. Regarding the improvement of

Generally, the hot strip or cold strip leaving the final rolling mill is wound into a coil shape by a take-up coiler, and is then overturned with one end face down, as shown in Figure 1. Although the coil 10 is conveyed on a conveyor in an up-end shape, winding defects occur due to various factors, and its axial cross-sectional shape (so-called winding shape)
is as shown in FIG. 2, for example. This winding shape is one of the important items of coil quality, and it is used to express the winding quality numerically.It is determined by the steps (unevenness) in each part of the multi-divided coil in the radial direction, as shown in Figure 3. It is represented by a telescopic amount (hereinafter referred to as "telescopic amount") representing the amount (amount) and a winding pattern as shown in FIGS. 4A to 4D, which is a shape created by the end face of the laminated strip in the cross section in the axial direction of the coil. That is, the telescopic amount is, for example, as shown in FIG.
It is expressed by the telescopic amount Tp at the total winding length P of 0, the telescopic amount Tx at the outer winding portion X, the telescopic amount Ty at the middle winding portion Y, and the telescopic amount Tz at the inner winding portion Z. Typical examples of the winding pattern include a jagged pattern as shown in FIG. 4A, a convex or concave shape as shown in FIG. 4B, and an inner or outer shape as shown in FIG. 4C. Tele type, Figure 4D
There are linear types as shown in the figure below.

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 500° C., it was not possible to approach the hot strip coil sufficiently, and the determination was made by visual inspection, which resulted in poor measurement accuracy.

In addition, Japanese Patent Publication No. 53-15018 proposes a method in which the amount of change in the shape of the coil end face is measured using an optical cutting method, and the quality of the shape is measured by pattern recognition. This method requires a large amount of computer capacity to perform the determination, and also has the problem of poor accuracy because it uses a light cutting method.

In order to solve this problem, it is possible to measure the winding shape of the coil from the change in the distance from the coil end face in the coil radial direction, which is detected by a laser distance meter placed opposite the coil end face. It is possible, but if the output of the laser rangefinder is used as the distance measurement value, the roundness A of the strip end face and the gap B between the laminated strips, as shown in Figure 5.
This has the problem that, especially when data is sampled, a large error occurs depending on the sampling timing, making it difficult to accurately measure the telescopic amount and accurately determine the winding pattern.

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, it may be considered to be abnormal data due to gap B and excluded, but even in actual coils, there are cases where the telescopic amount is quite large, and even data that is originally necessary may be excluded. There was a fear that I would put it away.

The present invention has been made to solve the above-mentioned conventional problems, and is a coil winding shape measuring method that can accurately measure the telescopic amount and easily and accurately determine the winding shape pattern. and equipment.

The present invention provides 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. In,
tracing the minimum value of the distance meter output to obtain a distance measurement value corresponding to the coil radial position;
When the distance meter output exceeds the upper limit of its measurement range and the radial length of the coil is greater than or equal to the set value, it is determined that the measurement is complete, and after the measurement is completed, the distance measurement associated with the coil radial position is performed. In addition to determining the telescope amount of the coil winding shape from the value, the relationship between the distance measurement value and the coil radial direction position is approximated by a quadratic regression curve, and the deviation between the quadratic regression curve and the distance measurement value is calculated by approximating the relationship between the distance measurement value and the coil radial direction position. The above object is achieved by determining the pattern of the coil winding shape from the sum of products and the coefficients of the quadratic regression curve.

The present invention also provides a coil winding shape measuring device including a laser distance meter for detecting a distance to the lower end surface of the coil, which is disposed opposite to the lower end surface of the up-end coil; A movement meter for detecting the amount of relative movement in the coil radial direction between the distance meter and the coil, and a peak trace that traces the minimum value of the output of the laser distance meter to obtain a distance measurement value corresponding to the amount of relative movement. means, a measurement end determination means for determining that the measurement is completed when the relative movement amount for which the output of the laser distance meter is equal to or higher than the upper limit of the measurement range is equal to or greater than a set value; , a telescope amount calculation means for calculating the telescope amount of the coil winding shape from the distance measurement value after the end of the measurement, and approximating the relationship between the distance measurement value and the relative movement amount using a quadratic regression curve, a regression calculation means for calculating the sum of squares of deviations between the linear regression curve and the distance measurement value and a coefficient of the quadratic regression curve; and determining a pattern of the coil winding shape from the sum of squares of the deviations, the coefficient, and the telescope amount. In addition to the above-mentioned purpose, by providing a pattern determination means that
This enables more accurate measurement of the coil winding shape.

In the present invention, the minimum value of the distance meter output is traced to obtain the distance measurement value corresponding to the coil radial position, so that the coil can be used with high precision regardless of the roundness of the strip end face or the gap between the strips. The winding shape can be measured. In addition, since the measurement is determined to be completed when the radial length of the coil whose distance meter output is greater than or equal to the upper limit of the measurement range is greater than or equal to the set value, the trace of the minimum value allows the coil to be This prevents the final value from being retained even if the value is lost. Therefore, accurate distance measurements can be obtained, and after the measurement is completed,
The telescope amount of the coil winding shape can be determined with high precision 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, and the sum of squares of the deviation between the quadratic regression curve and the distance measurement value, the coefficient of the quadratic regression curve, Further, since the pattern of the coil winding shape is determined from the telescope amount as necessary, the pattern of the winding shape can be determined easily and accurately. Further, if the distance meter is a laser distance meter 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.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a coil winding shape measuring device to which the present invention is applied will be described in detail with reference to the drawings.

A first embodiment of the present invention, as shown in FIG.
A laser distance meter 22 disposed opposite to the lower end surface 10A of the coil 10 for detecting the distance to the lower end surface 10A, and a pulse transmitter 24 for detecting the amount of radial movement of the coil 10 by the conveyor 20.
and a function of a peak tracing means for tracing the minimum value of the output of the laser distance meter 22 to obtain a distance measurement value corresponding to the amount of movement;
2 A function of a measurement end determination means that determines that the measurement has ended when the number of times the output continues to be at or above the upper limit of the measurement range (amount of movement) is equal to or greater than a set value; The function of the telescope amount calculation means for calculating the telescope amount of the coil winding shape from the distance measurement value, approximates the relationship between the distance measurement value and the movement amount using a quadratic regression curve, and calculates the quadratic regression curve. and the deviation of said distance measurements by 2
A microcontroller having a function of a regression calculation means for calculating a sum of products and a coefficient of the quadratic regression curve, and a function of a pattern determination means for determining a pattern of a coil winding shape from the sum of squares of the deviation, a coefficient, and a telescope amount. It consists of a computer 28.

The laser distance meter 22 is connected to the surface of the coil 10 (lower end surface 10
A) includes a laser light source 22A for irradiating a laser beam through a lens 22B, and a linear image sensor 22D for receiving the laser beam reflected by the surface of the coil 10 through a lens 22C.
For example, when the surface of the coil 10 moves from the position of the solid line to the position of the broken line,
Along with this, the laser beam also moves as shown by the broken line,
Since the incident position on the linear image sensor 22D changes, the variation in the coil surface, that is, the distance to the surface of the coil 10, is detected from the output of the linear image sensor 22D, which changes depending on the receiving position of the laser beam. It is something to do. The distance measurement by this laser distance meter 22 is, for example, 500 times per second.
It has been done about once.

The operation of the first embodiment will be explained below.

In this first embodiment, the output of the laser distance meter 22 is transmitted to the microcomputer 2 every unit movement of the coil 10, for example, every approximately 0.5 mm, using a signal from a pulse transmitter 24 provided on the conveyor 20.
Incorporated into 8. Note that if the moving speed of the coil 10 is constant, it is also possible to input the data to the microcomputer 28 at a constant cycle. As shown in FIG. 8, first, in step 100, the data taken into the microcomputer 28 is
Peak trace processing is performed by tracing the minimum value. This peak trace processing is performed to detect only the edge apex D necessary to accurately obtain the telescopic amount T, since the end face of the strip is not rectangular but has a roundness A, as shown in Fig. 5 above. It is something. This is also effective in excluding scale over in the strip gap B.

Next, the process advances to step 200, and since the number of times that the captured data exceeds the upper limit of the measurement range of the laser distance meter 22 is greater than the set value,
Determine whether the measurement is complete. As shown in FIG. 5 above, the start of measurement at the outermost part of the coil ₁₀ is
This can be determined from the change in the laser distance meter output data when the coil 10 moves to the top of the laser distance meter 22, but at the innermost Ci of the coil 10, even if the coil 10 disappears due to the peak trace processing, This is to clear the final value since it will be retained.

Specifically, the peak trace processing 100 and the measurement end determination processing 200 are executed, for example, according to the procedure shown in FIG. 9. That is, first, in step 112, measured values are read. Then step 114
Then, it is determined whether the output of the laser distance meter 22 is greater than or equal to the upper limit of the measurement range, that is, the amount of scale over. If the judgment result is negative, step
Proceed to step 116 and perform peak trace processing. Then, in step 118, the data is stored and the process returns to step 112 to continue the measurement. 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, where the number of consecutive scale overs G is counted. Then step 122
Then, it is determined whether the number of scale overs G exceeds a set value Gs (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 complete. Therefore, as shown in FIG. 10, the data at the end of the measurement are effective data L ₁ to Ln corresponding to the coil thickness portion and peak hold data L _{o+1o+1 to Ln} after the inward winding of the coil 10 is completed. It is composed of Ln+Gs.

Through this peak trace processing and measurement end determination processing, accurate distance fluctuations in the end face position of the coil 10 can be determined.

After determining the end of the measurement in step 200, the process proceeds to step 300, where the telescopic amount is calculated. To calculate this telescopic amount, data obtained by peak trace processing as shown in Figure 10 above is used.
Among L ₁ ~ Ln + Gs, measurement data only for the coil part
L ₁ to Ln are used. Specifically, as shown in Figure 3 above, the telescopic amount Tp is determined as the difference between the maximum values within the entire thickness P, and the telescopic amount Tp is determined as the difference between the maximum and minimum values within the outer winding portion X. Calculate Tx, and calculate the telescopic amount as the difference between the maximum and minimum values within the middle winding section Y.
Ty is determined, and the telescopic amount Tz is determined as the difference between the maximum value and the minimum value within the inner winding portion Z.

After completing the telescopic amount calculation in step 300 above,
Proceeding to step 400, the winding pattern is determined. Specifically, as shown in FIG. 11, first, in step 410, the relationship between the measured distance value and the amount of coil movement x is calculated by performing quadratic regression using the quadratic function equation ax ² +bx +c.
Find coefficients a, b, and 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 determined. Then proceed to step 414,
As shown in Figure 12, the quadratic regression curve ax ² +bx+c
The number of peaks N (N=12 in the case of FIG. 12) within the coil winding is determined by counting the number of data blocks that are separated from the set deviation ±e or more.
Next, in step 416, the coefficients a,
b, sum of squares of deviation S, number of peaks N, and telescopic amount
Using Tx and Tz as parameters of the winding shape, the winding shape pattern is determined by, for example, the tree method, as shown in FIG. In Figure 13, a ₀ , S ₀
is the threshold value for determining unevenness, N ₀ is the threshold value for determining jaggedness, and S ₁ (<S ₀ ) is
Threshold value for other determinations, To is the threshold value for determining outside telegraphy, and Ti is a threshold value for determining internal telescoping, and these thresholds are used for winding shape management. It is determined by the content, that is, the priority of the detected shape pattern and the allowable telescopic amount. Note that the pattern determination tree shown in FIG. 13 is for determining representative patterns, and 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, where output processing is performed.

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

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

As shown in FIG. 14, this second embodiment uses a coil winding shape measuring device having a conveyor 20, a laser distance meter 22, a pulse transmitter 24, and a microcomputer 28 similar to those of the first embodiment. A signal processing device 36 that performs processing and measurement end determination processing is provided between the laser distance meter 22 and the microcomputer 28, and processes other than the peak trace processing and measurement end determination processing are performed within the microcomputer 28. The microcomputer 28 is connected to a host computer 40, and a display device 42 such as a printer is provided to display the calculation results and determination results of the microcomputer 28.

The signal processing device 36 is, for example, as shown in FIG. 15, a first device that stores the output of the laser distance meter 22 outputted at a constant period, or the output of the laser distance meter 22 sampled at a constant period. A memory 36A, a second memory 36B that stores the previous data transferred from the first memory 36A, and a second memory 36B that stores the current data stored in the first memory 36A.
Subtraction subtracts the previous data stored in , calculates the difference, and if the difference is negative, outputs a command signal to store the current value in the third memory 36G that stores minimal data. 36C, a head setting device 36D for setting a threshold value for determining whether or not it is necessary to change the output, and the output of the subtractor 36C is set by the head setting device 36D. a comparator 36E that outputs an output change command signal when it is larger than a threshold; and the comparator 36
When the output change command signal is input from E, the fourth memory 36H stores the output value up to that point.
Output control circuit 3 for storing output data in
6F and a third memory 3 for storing local minimum values.
6G and a fourth memory 3 for storing output values.
6H, and an output circuit 36J for outputting the contents of the fourth memory 36H.
Further, the output control circuit 36F has the comparator 36
When the output change command signal of the E output is received, the time is measured from that point, and the comparator 36
It has a function of determining that the coil 10 is not above the laser distance meter 22 and clearing the output to zero when the output change command signal is not input from E. The zero clear of the output control circuit 36F is released when the next coil 10 begins to be measured and the top of the first coil is detected. Note that 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. The distance measurement value changes as follows. Therefore, an accurate distance measurement value can be obtained regardless of the roundness A of the end faces of the strips or the gap B between the strips. Furthermore, the measured distance value does not change due to a change in sampling timing. Figure 17 shows the laser distance meter 2
2 output and the actual measured value of the signal processing device 36 output are compared and shown.

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 signal processing device 36. Moreover, the measurement end determination in the signal processing device 36 is performed because the coil moving speed is stable.
This is done based on the duration of the scale over. Furthermore, the determination of the winding shape pattern is based on the coil 1
This is done only at the middle winding portion Y of 0. Then, the sum of squares of the deviation S used for determining the winding shape pattern
The number N of peaks is calculated per unit length and compared with a threshold value. For this reason, the outer diameter and inner diameter of the coil 10 are input from the host computer 40, the expected number of data for the middle winding portion Y is calculated, and the next calculation is performed.

S'=S+(500/expected number of data)...(1) N'=N×(500/expected number of data)...(2) With this method, the telescopic amount can be measured with a measurement accuracy of ±2 mm. did it. In addition, it has become possible to classify winding patterns into approximately 15 patterns, including jagged, uneven, straight, diagonal, external, and internal, with a match rate of approximately 90% with visual judgment. These measurement results are displayed on the display device 42.

In this second embodiment, the signal processing device 36
is independent, so the microcomputer 28
The program within is simplified.

As explained above, according to the present invention, the telescopic amount can be measured with high precision, and the winding pattern can be easily and accurately determined, which is an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the winding shape of the strip coil, FIG. 2 is a cross-sectional view taken along the - line in FIG. 1, and FIG. 3 is a line showing the amount of telescope generated in the coil. 4A to 4D are diagrams showing typical examples of the winding pattern, FIG. 5 is a cross-sectional view showing the roundness and gap of the strip, and FIG. 6 is a coil according to the present invention. FIG. 7 is a block diagram showing the structure of the first embodiment of the winding shape measuring device, FIG. 7 is a block diagram showing the main structure of the laser distance meter used in the first embodiment, and FIG. , FIG. 9 is a flowchart showing the main processing steps of the microcomputer used in the first embodiment, FIG. 11 is a diagram showing an example of data at the time of determining the end of measurement, FIG.
FIG. 2 is a diagram showing the state in which the number of peaks is calculated in the pattern determination process, FIG. 13 is a flowchart showing an example of the pattern determination tree used in the pattern determination process, and FIG. FIG. 15 is a block diagram showing the configuration of a second embodiment of the coil winding shape measuring device according to the present invention. FIG. 16 is a diagram showing data held by the signal processing device, and FIG. 17 is a diagram comparing and showing an example of the relationship between input and output of the signal processing device. 10...Coil, 10A...Lower end surface, Tp,
Tx, Ty, Tz...Telescopic amount, 20...Conveyor, 22...Laser distance meter, 24...Pulse transmitter, 28...Microcomputer, 36...Signal processing device.

Claims (1)

[Claims] 1. A winding of a coil in which the winding shape of the coil is measured from a change in the distance from the end face of the coil in the radial direction of the coil, which is detected by a distance meter placed opposite the end face of the coil. In the shape measuring method, 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 where the distance meter output is greater than or equal to the upper limit of the measurement range. When the distance is greater than or equal to the set value, it is determined that the measurement is completed, and after the measurement is completed, the telescope amount of the coil winding shape is determined from the distance measurement value associated with the coil radial position, and the distance measurement value and the coil The relationship with the radial position is approximated using a quadratic regression curve, and the pattern of 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. A method for measuring the winding shape of a coil. 2. A laser distance meter arranged opposite to the lower end surface of the up-end coil for detecting the distance to the lower end surface of the coil, and relative movement in the coil radial direction between the laser distance meter and the coil. a movement meter for detecting the amount of 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; A measurement end determination means that determines that the measurement is completed when the relative movement amount that is equal to or greater than the upper limit is equal to or greater than a set value; a telescope amount calculating means for calculating the telescope amount of the shape; and approximating the relationship between the distance measurement value and the relative movement amount using a quadratic regression curve, and calculating the square of the deviation between the quadratic regression curve and the distance measurement value. The present invention is characterized by comprising regression calculation means for calculating the sum and coefficients of the quadratic regression curve, and pattern determination means for determining the pattern of the coil winding shape from the sum of squares of the deviations, the coefficients, and the telescope amount. A coil winding shape measurement device.