JP5810709B2 - Edge length measurement method for striped steel coil - Google Patents

Description

  The present invention relates to a method for measuring the edge length of a vertically striped steel sheet coil.

A vertically striped steel plate is a steel plate in which a plurality of ribs extending in the rolling direction (longitudinal direction) on the surface of the steel plate are formed in parallel to the plate width direction, a steel plate having ribs formed only on the upper surface, and ribs formed only on the lower surface. There are three types of steel plates: steel plates with ribs formed on both the upper and lower surfaces.
A vertically striped steel plate K shown in FIG. 14 is a steel plate having ribs B formed only on the upper surface, and is used as a spiral steel pipe material in a steel pipe manufacturing factory. As shown in FIG. 15, a spiral steel pipe is welded while being spirally wound. It is said. The spiral steel pipe obtained in this way is erected in the ground at a civil engineering construction site, and is frequently used as a steel pipe pillar for filling concrete into the steel pipe (for example, Patent Document 1).

  Usually, a finish rolling mill for a production line of vertical strip steel sheets includes a plurality of stands composed of a reduction stand provided with a caliber rolling roll and a pass stand that allows a material to be rolled to pass therethrough, and the material to be rolled is a reduction stand. The vertically striped steel plate K having a plurality of ribs B formed on the upper surface is manufactured. And the vertical stripe steel plate K manufactured by passing through a finish rolling mill is wound up by the coiler as the vertical stripe steel plate coil KC.

  In order to prevent welding failure when the edge strips are welded spirally by winding the striped steel coil KC in a spiral shape, the length in the plate width direction from the rib B on the most edge side in the plate width direction to the edge Z shown in FIG. (Edge length) E is formed to be within a predetermined allowable range. However, the shape of the material to be rolled before finish rolling, or the centering of the material to be rolled is misaligned, the rolling balance is poor, and the material to be rolled is biased to either the left or right side. When the center shift occurs, the edge length E of the vertically striped steel plate coil KC tends to be outside the allowable range.

  Therefore, an operator measures the edge length E of the outer peripheral portion of the manufactured vertical stripe steel plate coil KC, and if the edge length E is outside the allowable range, the next rolling schedule is based on the measurement result. The center deviation of the rolling stand or pass stand with respect to the material to be rolled is corrected by the finish rolling setup.

JP 2009-28770 A

However, manually measuring the edge length of the hot striped steel coil KC immediately after manufacture is problematic from the viewpoint of worker safety and measurement accuracy.
Therefore, the present invention was made paying attention to the unsolved problem of the conventional example, without having to manually measure the edge length of the coil, the edge length of the vertically striped steel sheet coil, a specific location, Or it aims at providing the edge length measuring method of the vertical stripe steel plate coil which can measure with high precision over the whole coil area.

In order to achieve the above object, the edge length measuring method of a vertically striped steel sheet coil according to claim 1 of the present invention is a laser distance in a radial direction along a coil end surface of a vertically striped steel sheet coil in which the vertically striped steel sheet is wound in a coil shape. The distance between the laser distance meter and the coil end face side of the wound vertical stripe steel plate from the outermost circumference to the innermost circumference is measured by moving the gauge and emitting the laser beam of the laser distance meter toward the coil end face. In addition, by reading the distance information measured by the laser distance meter in ascending or descending order, by comparing the magnitude relationship between the absolute value of the difference between the distance data read this time and the distance data read last time and the sudden change threshold value, and distance data to the edge from the laser rangefinders predetermined winding vertical stripes steel, sure and distance data from the laser rangefinder of the ribs close to the edge to the rib A recognition step of the average value of a plurality of distance data to the edge from the laser rangefinder recognized by the recognition process, based on the average value of a plurality of distance data to the ribs from the laser rangefinder predetermined An edge length calculating step of calculating an edge length from the edge to the rib of the wound vertical stripe steel plate.

According to the present invention, the edge length of the vertically striped steel sheet coil is mechanically measured by a laser distance meter that moves in the radial direction along the coil end surface of the vertically striped steel sheet coil. Can be measured. Further, since the manual measurement operation is not performed, the working environment is not deteriorated, and the edge length measurement operation can be started in a short time even for a high-temperature vertically striped steel plate coil immediately after manufacture.
Furthermore, the laser rangefinder that emits laser light toward the end face of the vertical stripe steel plate coil can measure the distance data between the ribs and edges of each wound vertical stripe steel plate extending in the laser beam emission direction. The edge length from the outermost circumference to the innermost circumference of the steel sheet coil can be measured with high accuracy.

The invention according to claim 2 is the method of measuring the edge length of the vertically striped steel sheet coil according to claim 1, wherein the recognition step and the edge length calculation step are performed by winding at least the outermost circumference, the innermost circumference and the intermediate portion. This was done for vertically striped steel sheets.
According to the present invention, since the edge length measurement is performed on at least the outermost circumference, the innermost circumference, and the intermediately wound vertical stripe steel plate, the edge length in the longitudinal direction of the vertical stripe steel plate coil can be measured with high accuracy. Can do.

Furthermore, the invention according to claim 3 is the edge length measuring method of the vertically striped steel sheet coil according to claim 1 or 2, wherein the edge length calculated in the edge length calculating step is formed within an allowable range. A quality determination step of determining whether or not the vertical stripe steel sheet coil is good by determining whether or not the vertical stripe steel sheet coil is present.
According to the present invention, by immediately grasping the edge length defect of the vertically striped steel sheet coil, it is possible to correct the center deviation between the rolling stand or pass stand of the finishing rolling mill for manufacturing the vertically striped steel sheet and the material to be rolled. .

  According to the edge length measuring method of a vertically striped steel sheet coil according to the present invention, the edge length of a vertically striped steel sheet coil can be measured with high accuracy over a specific place or the entire coil area.

The principal part of the production line of a vertical strip steel plate is shown roughly. It is a figure which shows the apparatus which measures the edge length of a vertical stripe steel plate coil. It is a figure which shows a component for the arithmetic unit of the apparatus which measures the edge length of a vertical stripe steel plate coil. It is a flowchart which shows the quality determination program of a vertical stripe steel plate coil. It is a flowchart which shows the measurement data acquisition process of a quality determination program. It is a flowchart which shows the edge length calculation process of a quality determination program. It is a flowchart which shows the outermost periphery calculation process of an edge length calculation process. It is a flowchart which shows the innermost circumference calculation process of an edge length calculation process. It is a flowchart which shows the intermediate part calculation process of an edge length calculation process. It is a flowchart which shows the quality determination process of the quality determination program of a vertical stripe steel plate coil. It is a figure which shows the operation | movement of outermost periphery calculation processing. It is a figure which shows the operation | movement of innermost circumference calculation processing. It is a figure which shows the operation | movement of an intermediate part calculation process. It is a figure which shows the state which wound the vertical stripe steel plate in the coil shape, and formed the vertical stripe steel plate coil. It is a figure which shows the state which manufactures the spiral steel pipe using a vertical stripe steel plate coil. It is a figure which shows the edge length of the edge part of a vertical stripe steel plate coil.

DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings.
FIG. 1 shows a main part of a production line for a vertically striped steel sheet, and FIG. 2 shows an apparatus for measuring the edge length of a vertically striped steel coil. In FIG. 2, a steel plate having ribs formed only on the upper surface is wound as a vertically striped steel coil.
The finish rolling mill 1 shown in FIG. 1 is composed of a plurality of stands, and the second stand from the left is a caliber roll upper rolling roll 3a and a flat roll lower rolling roll 3b provided with a caliber groove. The other stand is a pass stand that allows the material to be rolled 2 to pass through with the gap widened.

And the to-be-rolled material 2 which was hot-rolled and conveyed to the finishing mill 1 passes the rolling stand 3, and the vertical strip steel plate K which formed the several rib B in the steel plate surface is manufactured, and the coiler 4 is made. It is wound up as a vertically striped steel plate coil KC.
As shown in FIG. 2, a scanning laser distance meter 5 is disposed at a position facing one end face of the vertically striped steel plate coil KC, and this laser distance meter 5 is supported by a moving device (not shown). Then, it moves along the radial direction of the vertical stripe steel plate coil KC, and emits a pulse laser beam toward one end face of the vertical stripe steel plate coil KC. And the minute time when the reflected light reflected by the innermost winding vertical stripe steel plate RK8 wound around the coiler 4 from the outermost winding vertical stripe steel plate RK1 of the vertical stripe steel plate coil KC existing in the emission direction of the pulse laser beam is measured. To calculate the distance data. That is, the laser distance meter 5 emits a pulse laser beam at every predetermined pulse (for example, 0.3 mm / s), and the distance between the laser distance meter 5 itself and the end side of each of the wound vertical strip steel plates RK1 to RK8. obtaining data (distance data _{L S} between the laser distance meter 5 and the ribs B1 to B8, the distance data _{L S} between the laser distance meter 5 and the edge Z1 to Z8).

The distance data Ls measured by the laser distance meter 5 is stored in the control device 6, and the control device 6 determines the quality of the vertical stripe steel plate coil KC based on the stored distance data L _S , and the determination result is displayed on the display device 7. Is output.
As shown in FIG. 3, the control device 6 includes an input port 8, an arithmetic processing unit 9, and an output port 10.

Distance data L _S measured by the laser distance meter 5 is continuously input to the input port 8.
The arithmetic processing unit 9 includes a ROM (read only memory) 11 and a RAM (random access memory) 12. The arithmetic processing unit 9 may include a ROM 11 and a RAM 12 built in, or a ROM 11 and a RAM 12 externally connected by a bus.
The ROM 11 stores a quality determination program for a vertically striped steel sheet coil, which will be described later.
The RAM 12 stores calculation values used in the calculation of the vertical stripe steel plate coil quality determination program, and also includes an area for the data storage unit 13 and an area for storing intermediate data.
The output port 10 outputs the result calculated by the ROM 11 of the arithmetic processing unit 9 to the display device 7.

Next, with reference to FIGS. 4 to 10, the quality determination program for the vertically striped steel sheet coil executed by the control device 6 will be described.
The vertical stripe steel plate coil quality determination program shown in FIG. 4 first performs measurement data acquisition processing in step ST1, then proceeds to step ST2, performs edge length calculation processing of the vertical stripe steel plate coil, and then proceeds to step ST3. Then, the quality determination processing of the vertically striped steel sheet coil is performed.

In the measurement data acquisition process of step ST1 in FIG. 4, as shown in FIG. 5, it is first determined in step ST5 whether the laser distance meter 5 is measuring. If the laser distance meter 5 is measuring at this step ST5, the process proceeds to step ST6 to read the distance data L _S , the process proceeds to step ST7, and the distance data L _S is stored in the data storage unit 13, and the step ST Then, after adding “1” to the data count number n (initial value 0), the process proceeds to step ST5.

  If the laser distance meter 5 stops the measurement in step ST5, the process proceeds to step ST9 to determine whether the data count number n is an even number, and if the data count number n is an even number. In step ST10, the calculation result of n / 2 is stored as the intermediate data number M. If the data count number n is an odd number in step ST9, the process proceeds to step ST11 and the data count number n is changed to “1”. "Is subtracted and then the process proceeds to step ST10.

Next, as shown in FIG. 6, the edge length calculation process in step ST2 in FIG. 4 first executes the outermost circumference calculation process (see FIG. 7) in step ST12, and then proceeds to step ST13 to move to the innermost circumference. An arithmetic process (see FIG. 8) is executed, and then the process proceeds to step ST14 to execute an intermediate part arithmetic process (see FIG. 9).
In the outermost periphery calculation process of FIG. 7, first, the distance data Ls in the data storage unit 13 is read in ascending order in step ST15. That is, the distance data L _S, the data of vertical stripes steel RK1 winding the outermost vertical stripes steel coil KC is gradually being read first.

Next, the process proceeds to step ST16, and "1" is added to the data count number n (initial value 0).
Then, the process proceeds to step ST17, it compares the absolute value of the difference between the forme now Kaidoku and distance data L _S and pre Kaidoku distance data L _S-1 forme, the size relationship between the sudden change threshold K _S. Here, the sudden change threshold value K _S is set to a value that is approximately 1/3 of the edge length that is normally set.
If the absolute value of the difference between the current value L _S and the previous value L _S-1 of the distance data is greater than or equal to the sudden change threshold value K _{S in} step ST17, the process proceeds to step ST18, where the absolute value of the difference changes suddenly. If below the threshold _{K S} moves to step ST15.

In step ST18, it is determined whether or not the switch Sw (initial value 0) is “1”.
If switch Sw ≠ 1 in step ST18, the process proceeds to step ST19, and if switch Sw = 1 in step ST18, the process proceeds to step ST20.
In step ST19, the distance HB1 of the rib B1 is averaged from the third distance data to the (n-2) th distance data in the data storage unit 13. Then, the process proceeds to step ST21 where the data count number n is stored as the data count memory N, and then the process proceeds to step ST22 where the switch Sw is set to “1” and then the process proceeds to step ST15.
In step ST20 that is shifted to when the switch Sw = 1 in step ST18, the distance HZ1 of the edge Z1 is averaged from the (N + 2) th distance data to the (n-2) th distance data in the data storage unit 13. .

Next, the process proceeds to step ST23, and the outermost edge length E1 is calculated from the difference between the distance HB1 of the rib B1 and the distance HZ1 of the edge Z1.
Next, the process proceeds to step ST24, where the data count number n, the data count memory N and the switch Sw are cleared to zero.
In the innermost circumference calculation process in FIG. 8, first, the distance data Ls in the data storage unit 13 is sorted in descending order in step ST30. That is, as the distance data Ls, the data of the innermost circumferentially wound vertical striped steel plate RK8 wound around the coiler 4 is first read.

Next, the process proceeds to step ST31, and the distance data Ls in the data storage unit 13 is read.
Next, the process proceeds to step ST32 where “1” is added to the data count number n (initial value 0).
Then compares the absolute value of the difference between the distance data L _S-1 forme Kaidoku before and distance data L _S forme Kaidoku now proceeds to a step ST33, the size relationship between the sudden change threshold K _S.
If the absolute value of the difference between the current value L _S and the previous value L _S-1 of the distance data is greater than or equal to the sudden change threshold value K _{S in} step ST33, the process proceeds to step ST34, where the absolute value of the difference changes suddenly. If below the threshold _{K S} moves to step ST31.

In step ST34, it is determined whether or not the switch Sw (initial value 0) is “1”.
If the switch Sw ≠ 1 in step ST34, the process proceeds to step ST35, and if the switch Sw = 1 in step ST34, the process proceeds to step ST36.
In step ST35, the distance from the third distance data to the (n-2) th distance data in the data storage unit 13 is averaged to obtain the distance HZ8 of the edge Z8. Then, the process proceeds to step ST37, where the data count number n is stored as the data count memory N, then the process proceeds to step ST38, the switch Sw is set to “1”, and then the process proceeds to step ST31.
In step ST36 which is shifted to when the switch Sw = 1 in step ST34, the distance HB8 of the rib B8 is averaged from the (N + 2) th distance data to the (n-2) th distance data in the data storage unit 13. .

Next, the process proceeds to step ST39, and the innermost edge length E8 is calculated from the difference between the distance HB8 of the rib B8 and the distance HZ9 of the edge Z8.
Next, the process proceeds to step ST40, where the data count number n, the data count memory N and the switch Sw are cleared to zero.
In the intermediate part calculation process of FIG. 9, first, the distance data L _S in the data storage unit 13 is sorted in ascending order in step ST50. That is, the distance data L _S, the data of vertical stripes steel RK1 winding the outermost vertical stripes steel coil KC is read first.

Then the process proceeds to step ST51, reads the distance data _{L S} of the data storage unit 13.
Next, the process proceeds to step ST52, where “1” is added to the data count number n (initial value 0).
Next, the process proceeds to step ST53, where it is determined whether or not the first switch Sw1 (initial value 0) is “1”. If the first switch Sw1 ≠ 1 in step ST53, the process proceeds to step ST54. If the first switch Sw1 = 1 in step ST53, the process proceeds to step ST56.

In step ST54, which shifts to the case where the first switch Sw1 ≠ 1 in step ST53, the data count number n is compared with the intermediate data number M (see FIG. 4), and the data count number n is greater than or equal to the intermediate data number M. If the data count number n is less than the intermediate data number M, the process proceeds to step ST51.
In step ST55, the first switch Sw1 is set to “1”, and then the process proceeds to step ST56.

In step ST56, it compares the absolute value of the difference between the forme now Kaidoku and distance data L _S and pre Kaidoku distance data L _S-1 forme, the size relationship between the sudden change threshold K _S.
If the absolute value of the difference between the current value L _S and the previous value L _S−1 of the distance data is greater than or equal to the sudden change threshold value K _S in step ST56, the process proceeds to step ST57, where the absolute value of the difference changes suddenly. If below the threshold _{K S} moves to step ST51.
In step ST57, it is determined whether or not the second switch Sw2 (initial value 0) is “1”.

If the second switch Sw2 ≠ 1 in step ST57, the process proceeds to step ST58, and if the second switch Sw2 = 1 in step ST57, the process proceeds to step ST59.
In step ST58, the distance HB5 of the rib B5 is averaged from the (M + 2) th distance data to the (n-2) th distance data in the data storage unit 13. Then, the process proceeds to step ST60, where the data count number n is stored as the data count memory N, then the process proceeds to step ST61, the second switch Sw2 is set to “1”, and the process proceeds to step ST51.
In step ST59, the process proceeds to step ST59 when the second switch Sw2 = 1. In step ST59, the distance HZ5 of the edge Z5 is averaged from the (N + 2) th distance data to the (n-2) th distance data in the data storage unit 13. And

Next, the process proceeds to step ST62, and the edge length E5 of the intermediate portion is calculated from the difference between the distance HB5 of the rib B5 and the distance HZ5 of the edge Z5.
Next, the process proceeds to step ST63, where the data count number n, the data count memory N, the first switch Sw1, and the second switch Sw2 are cleared to zero.
Next, quality decision processing in step ST3 in FIG. 4, as shown in FIG. 10, first, whether the edge of the outermost length E1 is minimum allowable value E _L or more edge length not in step ST70 judgment, if the outermost edge length E1 edge length minimum allowable value E _L or more goes to step ST71, the outermost edge length E1 is below the minimum allowable value E _L of the edge length value If so, the process proceeds to step ST76.

Step edges of outermost length E1 is equal to or less than the maximum allowable value E _H of the edge length in ST71, if the outermost edge length E1 is below the maximum allowable value E _H of the edge length if the process proceeds to step ST72, the outermost edge length E1 moves to step ST76 if the value exceeds the maximum allowable value E _H of the edge length.

Further, the innermost edge length E8 it is determined whether or not an edge length minimum allowable value E _L or more in the step ST72, the minimum allowable value E of the innermost edge length E8 edge length if _L or more goes to step ST73, the innermost edge length E8 proceeds to step ST76 if the value below the minimum allowable value E _L of the edge length.
Innermost edge length E8 is equal to or less than the maximum allowable value E _H of the edge length in step ST73, following the innermost edge length E8 edge length maximum permissible value E _H of if the process proceeds to step ST74, the innermost edge length E8 proceeds to step ST76 if the value exceeds the maximum allowable value E _H of the edge length.

The edge length E5 of the intermediate portion is equal to or in edge length minimum allowable value E _L or more in the step ST74, the edge length E5 of the intermediate portion is the edge length minimum allowable value E _L or more if the process proceeds to step ST75, the edge length E5 of the intermediate section moves to step ST76 if the value below the minimum allowable value E _L of the edge length.
Step ST75 edge length E5 of the intermediate portion is equal to or less than the maximum allowable value E _H of the edge length in, the edge length E5 of the intermediate portion there below the maximum allowable value E _H of the edge length For example, the process proceeds to step ST77, and in step ST77, display information “edge length is good” is output. The indication that “the edge length is good” may be other words.
Further, in step ST76, display information “edge length is defective” is output. It should be noted that the disclosure of information on the quality of the edge length is arbitrary, and an operation value may be displayed for use as feedback data.

Next, the edge length measurement operation | movement of the vertical stripe steel plate coil KC of this embodiment is demonstrated.
As shown in FIG. 2, the laser distance meter 5 moves along the radial direction of the vertical stripe steel plate coil KC, so that the distance data between the laser distance meter 5 itself and the end side of each of the wound vertical stripe steel plates RK1 to RK8. Ls is stored in the data storage unit 13 of the control device 6.
And the control apparatus 6 performs the outermost periphery calculation process, innermost periphery calculation process, and intermediate part calculation process of the vertical stripe steel plate coil KC.

As shown in FIG. 11, the outermost circumference calculation processing of the vertical stripe steel plate coil KC is an abrupt change threshold with the absolute value of the difference between the current value L _S and the previous value L _S−1 of the distance data stored in the data storage unit 13. by comparing the value K _S, the distance data S2 of the outermost rib B1, the distance data Pa of the outermost edge Z1, distance data Pb ribs B2 vertical stripes steel RK2 winding from the outermost periphery of the second layer Recognize Then, the distance HB1 of the rib B1 is calculated by averaging the data from the distance data S2 to the distance data Pa (S2 +, the average value of data from the second to Pa-2th: step ST19 in FIG. 7), and the distance data The distance HZ1 of the edge Z1 is calculated by averaging the data from Pa to the distance data Pb (average value of data from Pa + 2 to Pb-2: step ST20 in FIG. 7), and the distance HB1 and the distance HZ1 are calculated. Based on this, the edge length E1 of the outermost circumferentially wound vertical stripe steel plate RK1 is calculated (step ST23 in FIG. 7).

Further, as shown in FIG. 12, the innermost circumference calculation processing of the vertically striped steel plate coil KC includes the absolute value of the difference between the current value L _S and the previous value L _S−1 of the distance data stored in the data storage unit 13. sudden change by comparing the threshold value K _S, the distance data S4 edge Z8 vertical stripes steel RK8 winding innermost, and distance data Pc rib B8, winding vertical stripes steel in the second layer from the innermost RK7 The distance data Pd of the edge Z7 is recognized. Then, the distance HZ8 of the edge Z8 is calculated by averaging the data from the distance data S4 to the distance data Pc (S4 + average value of data from the second to the Pc-2th: step ST35 in FIG. 8), and the distance data The distance HB8 of the rib B8 is calculated by averaging the data from Pc to the distance data Pd (Pc + second to Pd-2th average value: step ST36 in FIG. 8), and the distance HB8 and the distance HZ8 are calculated. Based on this, the edge length E8 of the innermost circumferentially wound vertical striped steel plate RK8 is calculated (step ST39 in FIG. 8).

Further, as shown in FIG. 13, the intermediate calculation processing of the vertical stripe steel plate coil KC is performed by sudden change and the absolute value of the difference between the current value L _S and the previous value L _S−1 of the distance data stored in the data storage unit 13. by comparing the threshold value K _S, and the distance data Pe rib B5 vertical stripes steel RK5 winding around the fifth layer is an intermediate portion, and the distance data Pf edge Z5, the sixth layer winding of vertical stripes steel RK6 The distance data Pg of the rib B6 is recognized. Then, the distance HB5 of the rib B5 is calculated by averaging the data from the distance data Pe to the distance data Pf (Pe + the average value of the data from the second to the Pf-2th: step ST58 in FIG. 9), and the distance data The distance HZ5 of the edge Z5 is calculated by averaging the data from Pf to the distance data Pg (Pf + second to Pg-2th average value: step ST59 in FIG. 9), and the distance HB5 and the distance HZ5 are calculated. Based on this, the edge length E5 of the intermediate portion (fifth-layer wound vertical stripe steel plate RK5) is calculated (step ST62 in the figure).

Then, in the quality determination process, the control device 6 determines whether or not each of the edge lengths E1, E8, and E5 is formed within a range of allowable values E _{L to} E _H , and the edge length of the vertical stripe steel plate coil KC Display information indicating that the image quality is good or the edge length is bad is output to the display device 7.
Here, the recognition process of the present invention corresponds to step ST17 of FIG. 7, step ST33 of FIG. 8, and step ST56 of FIG. 9, and the edge length calculation process of the present invention corresponds to FIG. 6 to FIG. The quality determination process of the present invention corresponds to FIG.
According to the present embodiment, the measurement of the edge length of the vertical stripe steel plate coil KC is mechanically measured by the laser distance meter 5 that moves in the radial direction along the end face of the vertical stripe steel plate coil KC. Can measure the edge length.

Further, since no manual measurement work is performed, the edge length measurement work can be started even with a hot striped steel coil KC immediately after manufacture.
Further, the laser distance meter 5 that emits a pulse laser beam toward the end face of the vertical stripe steel plate coil KC has ribs B1 to B8 and edges Z1 to Z8 of the wound vertical stripe steel plates RK1 to RK8 extending in the emission direction of the pulse laser beam. Therefore, the edge length from the outermost periphery to the innermost periphery of the vertical stripe steel plate coil KC can be measured with high accuracy.
And the control apparatus 6 of this embodiment performs the outermost periphery calculation process of the vertical stripe steel plate coil KC, the innermost circumference calculation process, and the intermediate part calculation process, so that at least the outermost edge length E1 of the vertical stripe steel plate coil KC, Since the innermost edge length E8 and the middle edge length E5 are measured, the edge length in the longitudinal direction of the vertically striped steel plate coil KC can be measured with high accuracy.

Further, the present embodiment the control device 6, the quality decision process, the outermost periphery of the edge length of the vertical stripe steel coils KC E1, innermost edge length E8 and intermediate portions of the edge length E5 allowable value E _L ~ determines whether it is formed in the range of E _H, when the edge length is formed in the outside of acceptable values E _L to E _H, is poor edge length of vertical stripes steel coil KC Therefore, it is possible to immediately grasp the edge length defect of the vertically striped steel coil KC.
In addition, this embodiment demonstrated the vertical stripe steel plate coil KC formed by coiling the steel plate vertical stripe steel plate K in which the rib B extended in the rolling direction (longitudinal direction) of the upper surface was formed in parallel with the plate width direction. However, the present invention may be applied to a vertical stripe steel plate coil KC in which ribs are formed only on the lower surface, and ribs are formed on the upper and lower surfaces.

DESCRIPTION OF SYMBOLS 1 ... Finish rolling mill, 2 ... Material to be rolled, 3 ... Rolling stand, 3a ... Upper rolling roll, 3b ... Lower rolling roll, 4 ... Coiler, 5 ... Laser distance meter, 6 ... Control device, 7 ... Display device, 8 ... input port, 9 ... arithmetic processing unit, 10 ... output port, 11 ... ROM, 12 ... RAM, 13 ... data storage unit, B1 to B8 ... rib, K ... vertical strip steel plate, KC ... vertical strip steel plate coil, Ls: Distance data, RK1 to RK8 ... Wound vertical stripe steel plate, Z1 to Z8 ... Edge

Claims (3)

By moving the laser distance meter in the radial direction along the coil end face of the vertical stripe steel sheet coil in which the vertical stripe steel sheet is wound in a coil shape, and emitting the laser light of this laser distance meter toward the coil end face, from the outermost circumference While measuring the distance between the coil end face side of the wound vertical stripe steel plate to the innermost circumference and the laser distance meter,
By reading the distance information measured by the laser rangefinder in ascending or descending order, and comparing the magnitude relationship between the absolute value of the difference between the distance data read this time and the distance data read last time and the sudden change threshold value , A recognition step of recognizing distance data from the laser distance meter of the wound vertical stripe steel plate to the edge and distance data from the laser distance meter of the rib adjacent to the edge to the rib;
The average value of the plurality of distance data to the edge from the laser rangefinder recognized by the recognition process, from the laser rangefinders predetermined winding vertical stripes steel based on the average value of a plurality of distance data to the rib And an edge length calculation step of calculating an edge length from the edge to the rib. An edge length measurement method for a vertically striped steel sheet coil, comprising:   2. The method of measuring edge length of a vertically striped steel sheet coil according to claim 1, wherein the recognition step and the edge length calculating step are performed on at least the outermost circumferential, innermost circumferential and intermediate striped striped steel strips. It is characterized by comprising a quality determination step of determining whether the edge length calculated in the edge length calculation step is formed within a range of allowable values and determining quality of the vertical stripe steel plate coil. The edge length measuring method of the vertical stripe steel plate coil according to claim 1 or 2.

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