Projection measurement method for checkered steel plate and projection measurement device for checkered steel plate

Abstract

To provide a projection measurement method for a checkered steel plate and a projection measurement device for a checkered steel plate capable of suppressing a deviation between heights and positions of projections of a checkered steel plate calculated from an unevenness profile, and actual heights and positions of projections measured from the checkered steel plate to be shipped as a product.SOLUTION: A projection measurement method for a checkered steel plate for measuring a plurality of projections of the checkered steel plate includes: a measurement step (Step S1) of measuring an unevenness profile of the checkered steel plate over an entire width of the checkered steel plate by a projection measurement device installed on one surface side of the checkered steel plate being an exit side of a run-out table and formed with at least projections of both surfaces of the checkered steel plate; and a calculation step (Steps S2 and S3) of calculating positions of the projections and heights of the projections from the unevenness profile.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a method and an apparatus for measuring protrusions on checkered steel plates. [Background technology]

[0002] A checkered steel plate is a steel plate having a plurality of protrusions formed continuously on its surface at regular intervals in the width direction and length direction of the checkered steel plate. The checkered steel plate is produced by rolling a steel plate without the above-mentioned protrusions with patterned finishing rolls in a hot rolling line, and then winding it into a roll.

[0003] The height of protrusions on a checkered steel plate and their positions in the width and length directions of the checkered steel plate are determined by design. In other words, the protrusions are formed in a predetermined pattern. To ensure that the height and position of the protrusions on a checkered steel plate are formed as designed, methods for measuring the height and position of the protrusions on a checkered steel plate online have been studied. Examples of such methods are described in Patent Document 1 and Patent Document 2. Note that measuring the height and position of the protrusions on a checkered steel plate online means measuring the height and position of the protrusions on a checkered steel plate in a hot rolling line that produces the checkered steel plate.

[0004] In the method described in Patent Document 1, the thickness of a checkered steel plate across its entire width (hereinafter referred to as the thickness profile) is measured simultaneously across the entire width using a multi-channel thickness gauge installed on the delivery side of a hot rolling mill.The height and position of each protrusion are then calculated from the thickness profile.Patent Document 1 describes a thickness gauge that uses radiation such as X-rays or gamma rays as the above-mentioned thickness gauge.

[0005] In the method described in Patent Document 2, the thickness of a checkered steel plate across its entire width (hereinafter referred to as a full-width thickness profile) is measured simultaneously using a multi-channel thickness gauge installed on the delivery side of a hot rolling mill. Furthermore, the full-width thickness profile is compared with a converted thickness profile calculated from the projection arrangement specifications of the checkered steel plate to evaluate the thickness error of the checkered steel plate. Patent Document 2 describes a thickness gauge that uses radiation such as X-rays or gamma rays as the above-mentioned thickness gauge. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2017-121647 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-140911 Summary of the Invention [Problem to be solved by the invention]

[0007] The checkered steel plate produced by rolling in a hot rolling mill is transported to a run-out table where it is cooled with cooling water. This can change the shape of the checkered steel plate and may cause the checkered steel plate to shrink in width, resulting in changes in thickness and width.

[0008] However, the method described in Patent Document 1 measures the thickness of the checker steel plate using a thickness gauge installed at the exit of the hot rolling mill. This does not take into account the effects of changes in the shape of the checker steel plate when cooled by cooling water on the run-out table or the width contraction of the checker steel plate due to cooling water accumulating on the top surface of the checker steel plate. As a result, the height and position of the protrusions of the checker steel plate calculated from the thickness profile may differ from the actual height and position of the protrusions measured on the coiled checker steel plate, i.e., the checker steel plate shipped as a product. In particular, checker steel plates with protrusions on the top surface are more likely to have cooling water accumulating between the protrusions on the top surface than checker steel plates with protrusions on the bottom surface, resulting in a difference in cooling performance between the top surface and the bottom surface of the checker steel plate. Therefore, the method described in Patent Document 1 may result in a large discrepancy.

[0009] Furthermore, if a protrusion is formed on the underside of a checkered steel plate, the table roll of the run-out table may collide with the protrusion, causing the protrusion to break when the checkered steel plate runs over it. Alternatively, the protrusion may be thinned due to wear. As a result, the height and position of the protrusion of the checkered steel plate calculated from the plate thickness profile may differ from the actual height and position of the protrusion of the coiled checkered steel plate, i.e., the checkered steel plate to be shipped as a product. This situation is also true for the method described in Patent Document 2.

[0010] The present invention has been made to solve the above-mentioned problems, and aims to provide a method and device for measuring protrusions in checkered steel plates that can reduce the discrepancy between the height and position of protrusions in checkered steel plates calculated from the unevenness profile and the actual height and position of protrusions measured from checkered steel plates that are shipped as products. [Means for solving the problem]

[0011] The means for solving the above-mentioned problems are as follows. [1] A method for measuring protrusions in checkered steel plates that are produced by rolling using hot rolling equipment and cooled by a run-out table provided on the outlet side of the hot rolling equipment, the method comprising: a measurement step of measuring the unevenness profile of the checkered steel plate over the entire width of the checkered steel plate using a protrusion measuring device installed on the outlet side of the run-out table on at least one side of the checkered steel plate on which the protrusions are formed; and a calculation step of calculating the position and height of the protrusions from the unevenness profile. [2] The method for measuring protrusions in checkered steel plate according to [1], wherein the measurement step measures the unevenness profile over the entire length of the checkered steel plate at a preset cycle using a protrusion measuring device. [3] A method for measuring protrusions on checkered steel plate according to [1] or [2], wherein in the measuring step, the unevenness profile is measured using a plurality of two-dimensional laser displacement meters possessed by the protrusion measuring device. [4] A protrusion measuring device for checkered steel plates that measures multiple protrusions on checkered steel plates that are produced by rolling using hot rolling equipment and cooled by a run-out table provided on the outlet side of the hot rolling equipment, the protrusion measuring device for checkered steel plates having a shape meter that is installed on the outlet side of the run-out table and on at least one side of the checkered steel plate on which the protrusions are formed, and that measures the unevenness profile of the checkered steel plate over the entire width of the checkered steel plate, and an arithmetic processing unit that calculates the position and height of the protrusions from the unevenness profile measured by the shape meter. [5] The protrusion measuring device for checkered steel plate described in [4], wherein the shape meter measures the unevenness profile over the entire length of the checkered steel plate at a preset period. [6] The shape meter has a plurality of two-dimensional laser displacement meters installed in the width direction of the runout table. [4] or [5] is a checkered steel plate protrusion measurement device described in [4] or [5]. [Effects of the Invention]

[0012] According to the present invention, the unevenness profile is measured on the delivery side of the run-out table, which makes it possible to reduce the discrepancy between the height and position of the protrusions of the checkered steel plate calculated from the unevenness profile and the actual height and position of the protrusions measured from the checkered steel plate wound into a coil. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram showing an example of hot rolling equipment to which a protrusion measuring method and a protrusion measuring device for checkered steel plate according to an embodiment of the present invention can be applied. [Figure 2] FIG. 1 is a diagram illustrating an example of the configuration of a laser shape meter. [Figure 3] 10 is a flowchart showing an example of a method for calculating the position and height of a protrusion of a checkered steel plate. [Figure 4] FIG. 10 is a diagram showing an example of a concavo-convex profile. [Figure 5] FIG. 10 is a diagram for explaining calculation of the height of a protrusion. [Figure 6] This is a diagram to explain the degree of agreement between the shape of the checkered steel plate calculated based on the unevenness profile measured by four two-dimensional laser displacement meters across the entire width of the checkered steel plate and the shape of the checkered steel plate obtained by actual measurement. DETAILED DESCRIPTION OF THE INVENTION

[0014] An example of an embodiment of the present invention (hereinafter referred to as this embodiment) will be described below. FIG. 1 is a diagram showing an example of a hot rolling facility to which the protrusion measuring method and protrusion measuring device for checkered steel plate according to this embodiment can be applied. The hot rolling facility (sometimes referred to as a hot rolling line) shown in FIG. 1 includes a finishing rolling mill group 10, a run-out table 20, a coiling facility 30, and a protrusion measuring device 40.

[0015] (Finishing rolling mill group) The finishing rolling mill group 10 includes multiple finishing rolling mills, and is configured to finish roll a steel plate that has been rough-rolled by a roughing mill group (not shown) to a plate thickness determined by design using these finishing rolling mills. The finishing rolling mill group 10 also forms protrusions on the surface of the steel plate in a design-determined pattern to produce checkered steel plate 1. While the number of finishing rolling mills included in the finishing rolling mill group 10 is not limited, in the example shown in FIG. 1 , the finishing rolling mill group 10 includes seven finishing rolling mills. In this embodiment, the finishing rolling mills are referred to as the first finishing rolling mill F1, the second finishing rolling mill F2, the third finishing rolling mill F3, the fourth finishing rolling mill F4, the fifth finishing rolling mill F5, the sixth finishing rolling mill F6, and the seventh finishing rolling mill F7, from upstream to downstream in the steel plate threading direction.

[0016] Each of the finishing mills F1 to F7 has a pair of work rolls. Each pair of work rolls is arranged facing each other at a predetermined interval in the vertical direction of the hot rolling equipment, and the thickness of the steel sheet is reduced by passing the steel sheet between the work rolls. In this embodiment, one of the pair of work rolls in the seventh finishing mill F7 is a grooved roll, with grooves (not shown) formed on the surface of the roll in a design-defined pattern. By passing the steel sheet between the pair of work rolls in the finishing mill F7, protrusions corresponding to the shape of the grooves are formed on the surface of the steel sheet. In this way, protrusions are formed on the surface of the steel sheet in a design-defined pattern. That is, protrusions are formed on the surface of the checkered steel sheet 1 continuously or periodically in the sheet passing direction and width direction. In the following description, a steel sheet on which multiple protrusions are formed in this way will be referred to as a checkered steel sheet 1.

[0017] (Runout table) A run-out table 20 is provided downstream of the finishing rolling mill group 10 in the direction in which the checkered steel plate 1 passes. The run-out table 20 cools the checkered steel plate 1, which is transported by a plurality of table rolls (sometimes called transport rolls), not shown, to a predetermined temperature using cooling water. The run-out table 20 may be of a conventional type.

[0018] (winding equipment) A winding facility 30 is provided downstream of the run-out table 20 in the threading direction of the checkered steel plate 1. The winding facility 30 winds up the steel plate or checkered steel plate 1 cooled on the run-out table 20 into a coil, and may be a conventionally known facility. In the example shown in FIG. 1, two winding facilities 30 are installed. Therefore, for example, while one of the two winding facilities 30 is winding up the checkered steel plate 1, the checkered steel plate 1 wound up by the other winding facility 30 can be transported to another facility or process.

[0019] (Protrusion measuring device) A protrusion measuring device 40 is provided at the exit side of the run-out table 20 in the threading direction of the checkered steel plate 1 and at the entrance side of the winding equipment 30, to measure the height and position of each protrusion formed on the surface of the checkered steel plate 1. In other words, the protrusion measuring device 40 is provided between the run-out table 20 and the winding equipment 30. In this embodiment, the protrusion measuring device 40 has a laser shapemeter 50 and a calculation processing unit 60.

[0020] (laser shapemeter) The laser shape meter 50 measures the distance between the checkered steel plate 1 (the unevenness profile described below). In the example shown in FIG. 1, the laser shape meter 50 is arranged above and below the checkered steel plate 1, sandwiching the checkered steel plate 1 in the vertical direction of the hot rolling equipment. Furthermore, as shown in FIG. 1, the laser shape meter 50 is arranged side by side in the vertical direction. In the following description, the laser shape meter 50 installed above the checkered steel plate 1 in the vertical direction will be referred to as the upper laser shape meter 50a, and the laser shape meter 50 installed below the checkered steel plate 1 in the vertical direction will be referred to as the lower laser shape meter 50b.

[0021] FIG. 2 shows an example of the configuration of the laser shape meter 50. Of the two laser shape meters 50a and 50b, the upper laser shape meter 50a will be described first. The upper laser shape meter 50a includes an upper equipment box 51a extending across the entire width of the checkered steel plate 1 in the width direction of the hot rolling equipment, and multiple laser displacement meters 52 installed at different positions in the width direction within the upper equipment box 51a. In the example shown in FIG. 2, four laser displacement meters 52 are arranged within the upper equipment box 51a, and these laser displacement meters 52 are aligned at regular intervals in the width direction. Each laser displacement meter 52 can be, for example, a conventionally known two-dimensional laser displacement meter. The two-dimensional laser displacement meter irradiates a laser beam that spreads in a fan shape or radially toward an object at a predetermined frequency (kHz), receives the laser light reflected from the object, and measures the distance between the object and the object.

[0022] As shown in Figure 2, each of the laser displacement meters 52 irradiates the checkered steel plate 1 with a laser beam that spreads out in a fan-like or radial pattern in a direction approximately parallel to the width direction of the checkered steel plate 1 at a predetermined frequency (kHz). The installation interval between the laser displacement meters 52 is set so that the laser beams irradiated onto the checkered steel plate 1 from adjacent laser displacement meters 52 in the width direction overlap slightly in the width direction. In this way, the laser beams can be irradiated onto the checkered steel plate 1 from each laser displacement meter 52 almost simultaneously across the entire width of the checkered steel plate 1.

[0023] The upper laser shape meter 50a receives reflected light from the checkered steel plate 1 passing through the laser irradiation range. The upper laser shape meter 50a measures the time it takes for the laser emitted from the upper laser shape meter 50a to hit the checkered steel plate 1, reflect, and return to the upper laser shape meter 50a, and calculates the distance from that time. In other words, the principle of triangulation is used to measure the distance (unevenness profile) between the laser displacement meter 52 and the surface (top surface) of the checkered steel plate 1 almost simultaneously across the entire width of the checkered steel plate 1. The upper laser shape meter 50a also emits lasers from each laser displacement meter 52 at a predetermined interval. Therefore, the upper laser shape meter 50a can continuously measure the unevenness profile of the checkered steel plate 1 as it is continuously passed through the entire length of the checkered steel plate 1. The measurement interval (distance) of the unevenness profile in the longitudinal direction of the checkered steel plate 1 depends on the laser irradiation interval from the laser displacement meter 52 and the passing speed of the checkered steel plate 1.

[0024] The lower laser shape meter 50b is configured almost identically to the upper laser shape meter 50a, except that it is installed upside down relative to the upper laser shape meter 50a with the checkered steel plate 1 sandwiched between them. That is, as shown in FIG. 2, a lower equipment box 51b of the lower laser shape meter 50b is arranged vertically below the checkered steel plate 1. Inside the lower equipment box 51b, multiple laser displacement meters 52 are arranged at approximately the same intervals as the upper laser shape meter 50a. Each laser displacement meter 52 irradiates the underside of the checkered steel plate 1 with a laser at a predetermined interval. The lower laser shape meter 50b also receives the laser light reflected from the checkered steel plate 1 passing through the laser irradiation range. Using the principle of triangulation, distance data between the laser displacement meters 52 and the surface (lower surface) of the checkered steel plate 1, i.e., the unevenness profile, is measured almost simultaneously across the entire width of the checkered steel plate 1.

[0025] (arithmetic processing unit) Returning to the explanation of Figure 1, each of the laser profilometers 50a, 50b is electrically or communicatively connected to the calculation processing unit 60, and the unevenness profiles measured by each of the laser profilometers 50a, 50b are input to the calculation processing unit 60.

[0026] The calculation processing unit 60 is mainly composed of a microcomputer. The calculation processing unit 60 performs calculations based on the unevenness profile and pre-stored calculation formulas and data to calculate the height and position of each protrusion of the checkered steel plate 1.

[0027] (Method of calculating the height and position of protrusions) FIG. 3 is a flowchart showing an example of a method for calculating the position and height of protrusions on a checkered steel plate 1. The process for calculating the position and height of protrusions on a checkered steel plate 1 shown in the flowchart of FIG. 3 is executed, for example, while a hot rolling mill is in operation. In the example shown in FIG. 3, first, the unevenness profiles on both sides of the checkered steel plate 1 are measured over the entire width of the checkered steel plate 1 using each laser shapemeter 50a, 50b at a preset interval. This allows the unevenness profiles on both sides of the checkered steel plate 1 to be measured over the entire length of the checkered steel plate 1 (step S1). That is, the unevenness profile of the checkered steel plate 1, which has undergone shape changes and warpage or shrinkage in the width direction due to cooling on the runout table 20, is measured over the entire width and length of the checkered steel plate 1. Furthermore, the unevenness profile of the checkered steel plate 1, which may have undergone cracking or thinning of the protrusions due to the table rolls of the runout table 20, is measured over the entire width and length of the checkered steel plate 1. The above-mentioned step S1 corresponds to the measurement step of this embodiment.

[0028] Fig. 4 shows an example of an unevenness profile of a checkered steel plate measured by each of the laser shape meters 50a and 50b. The unevenness profile S shown in Fig. 4 is data on an xy coordinate system, with the width direction of the checkered steel plate 1 (the left-right direction in Fig. 4) as "x", the center in the width direction as 0 (x = 0), and the thickness direction of the checkered steel plate 1 (the up-down direction in Fig. 4) as "y". This unevenness profile S(x, y) is input to the calculation processing unit 60.

[0029] Then, the calculation processing unit 60 calculates an unevenness profile S1(x,y) obtained by taking a moving average of S(x,y) n1 times in the x direction, and an unevenness profile S2(x,y) obtained by taking a moving average of S(x,y) n2 times in the x direction. Then, based on the deviation amounts of the unevenness profiles S1(x,y) and S2(x,y) and a preset detection threshold value for the deviation amount, the positions X1 to X2 of each protrusion in the width direction of the checkered steel plate 1 from the operator side to the drive side are calculated. n The calculation processing unit 60 samples the input unevenness profile at a predetermined period, and calculates the positions X1 to X2 of the protrusions of the checkered steel plate 1 for the sampled unevenness profile. n The positions X1 to X2 of the protrusions may be detected. n Specifically, is the position of the center of each protrusion in the width direction.

[0030] Here, the above-mentioned operator side and drive side will be explained. In the hot rolling facility, drive devices such as electric motors and electric motor control devices (not shown) that operate the finishing mills F1 to F7 are arranged on one side across the hot rolling line. The operator's cab of the hot rolling facility is arranged on the other side across the hot rolling line. Therefore, the side on which the drive devices are arranged will be referred to as the drive side (hereinafter referred to as the DR side), and the opposite side on which the operator's cab is arranged will be referred to as the operator side (hereinafter referred to as the OP side). In this embodiment, as described above, as an example, the positions X1 to X2 of the protrusions are arranged from the OP side to the DR side. n Detect.

[0031] Next, the heights Y1 to Y n (Step S3). n In the example shown in FIG. 5, the position X of the protrusion in the x direction of the unevenness profile (the width direction of the checkered steel plate) is n Within the range of 1st distance d on both sides from (X n ±d) (hereinafter referred to as the first height Y top(denoted as). Also, find the average value of the plots at the root parts on both sides of the protrusion in the x-direction of the concavo-convex profile (X n ±D) (hereinafter, the second height Y bottom denoted as). The above-mentioned D is the distance from the position X of the protrusion to the root part (the second distance D), and the second distance D is longer than the first distance d (d < D). Next, by subtracting the first height Y n from the second height Y top the height Y of the protrusion at the position X bottom is calculated. Represented by a mathematical formula, it becomes the following formula. Calculate the height in the same way for other protrusions. Y n =(Average height in the range of X n ±d)-(Average height at the position of X n ±D) =Y top -Y bottom In addition, the calculation positions of each height described above are shown as "●" in FIG. 5. The above-mentioned step S2 and step S3 correspond to the calculation process of this embodiment.

[0032] The above-mentioned first distance d and second distance D can be determined in advance based on the specifications of the striped steel plate 1 manufactured by the hot rolling equipment. The maximum width of the protrusion in the width direction is determined by design for each striped steel plate 1 manufactured by the hot rolling equipment. Therefore, the first distance d can be set to a value smaller than, for example, half of the maximum width of the protrusion determined by design. Also, the second distance D can be set to a value larger than half of the above-mentioned maximum width. In this embodiment, the height Y of the above-mentioned protrusion n is sequentially calculated from the OP side toward the DR side. Thereafter, when the arithmetic processing unit 60 determines that the positions X n and heights Y[[ID=3८]] n of the protrusions of the striped steel plate 1 have been calculated up to the tail end of the striped steel plate 1 (step S4: Yes), the process of calculating the positions of the protrusions of the striped steel plate 1 and the method of calculating the height of the protrusions shown in the flowchart in FIG. 3 is terminated. Also, when the arithmetic processing unit GO determines that the positions X n and heights Y n of the protrusions of the striped steel plate 1 have been calculated up to the tail end of the striped steel plate 1,​​​If it is determined that has not been calculated (step S4: No), the process returns to step S1, and the process from step S1 is repeatedly executed.

[0033] (Actions and Effects) In this embodiment, as described above, the unevenness profile of the checkered steel plate 1 is measured by the laser shape meters 50a, 50b installed on the exit side of the run-out table 20, on both sides of the checkered steel plate 1 in the vertical direction of the hot rolling equipment. That is, the unevenness profile of the checkered steel plate 1 is measured, which may have undergone shape changes due to cooling on the run-out table 20, warpage or shrinkage in the width direction, or fracture or thinning of protrusions due to the table rolls of the run-out table 20. Then, the position and height of each protrusion on the checkered steel plate 1 are calculated based on the unevenness profile. This makes it possible to reduce the discrepancy between the height and position of the protrusions on the checkered steel plate 1 calculated from the unevenness profile and the actual height and position of the protrusions measured on the checkered steel plate 1 to be shipped as a product.

[0034] Furthermore, in this embodiment, the height and position of the protrusions of the checkered steel plate 1 are calculated online based on the above-described unevenness profile. Therefore, there is no need to stop the hot rolling equipment or unwind the coiled checkered steel plate 1 in order to measure the height and position of the protrusions of the checkered steel plate 1. As a result, the operating rate of the hot rolling equipment and the manufacturing efficiency of the checkered steel plate 1 can be improved.

[0035] The present invention is not limited to the above-described embodiment. For example, in the present embodiment, a protrusion measuring device 40 is installed on each of both sides of the checkered steel plate 1. Alternatively, a protrusion measuring device 40 may be installed on at least one of the two sides of the checkered steel plate 1 on which protrusions are formed. Furthermore, in the present embodiment, the height and position of the protrusions of the checkered steel plate 1 are calculated on the upper side of the unevenness profile from the OP side toward the DR side. Alternatively, the calculation may be performed from the DR side toward the OP side. Furthermore, in the present embodiment, the unevenness profile is measured using a two-dimensional laser displacement meter. Alternatively, the unevenness profile of the checkered steel plate may be measured using a multi-channel X-ray thickness meter. Furthermore, in the present embodiment, the unevenness profile of the checkered steel plate is measured. However, the unevenness profile of a hot-rolled steel plate with a distinctive surface shape may be measured instead of the checkered steel plate 1. Even in these cases, the same functions and effects as those of the present embodiment can be obtained. [Example]

[0036] An example conducted to verify the effects of this embodiment will now be described. In this example, the protrusion measuring device has four two-dimensional laser displacement meters, which are arranged at regular intervals in the width direction so that the measurable width of the checkered steel plate by the protrusion measuring device is 720 mm. Furthermore, each protrusion measuring device is installed on the outlet side of the run-out table in the hot rolling equipment, on both sides of the checkered steel plate in the vertical direction of the hot rolling equipment. Using these protrusion measuring devices, the unevenness profile of the checkered steel plate was measured online, almost in the same way as in the above-described embodiment, and the height and position of the protrusions of the checkered steel plate, i.e., the shape of the checkered steel plate, was calculated based on the unevenness profile.

[0037] FIG. 6 is a diagram illustrating the degree of agreement between the shape of a checkered steel plate calculated based on the unevenness profile measured by four two-dimensional laser displacement meters across the entire width of the checkered steel plate and the shape of the checkered steel plate determined by actual measurement. The solid line in FIG. 6 indicates the shape of the checkered steel plate calculated based on the unevenness profile. The dashed-dotted line in FIG. 6 indicates the shape of the checkered steel plate measured after winding. As shown in FIG. 6, the shape of the checkered steel plate calculated based on the unevenness profile and the shape of the checkered steel plate measured actually matched very well. From the above results, it was confirmed that this embodiment can suppress the discrepancy between the height and position of protrusions of the checkered steel plate calculated from the unevenness profile and the actual height and position of protrusions measured from the checkered steel plate. [Explanation of symbols]

[0038] 1. Checkered steel plate 10 Finishing rolling mills 20 Runout Table 30 Winding equipment 40 Protrusion measuring device 50 Laser shapemeter 50a Upper laser shapemeter 50b Lower Laser Profiler 51a Upper equipment box 51b Lower equipment box 52 Laser displacement meter 60 Processing unit F1 No. 1 finishing mill F2 No. 2 finishing mill F3 No. 3 finishing mill F4 No. 4 finishing mill F5 No. 5 finishing mill F6 No. 6 finishing mill F7 No. 7 finishing mill

Claims

1. A method for measuring protrusions in a checkered steel plate, the method comprising: measuring a plurality of protrusions in a checkered steel plate that is produced by rolling using a hot rolling facility and cooled by a run-out table provided on the outlet side of the hot rolling facility; a measuring step of measuring the unevenness profile of the checkered steel plate over the entire width of the checkered steel plate using a protrusion measuring device installed on the outlet side of the run-out table, on at least one side of the checkered steel plate on which the protrusions are formed, out of both sides of the checkered steel plate; a calculation step of calculating the position and height of the protrusion from the unevenness profile.

2. 2. The method for measuring protrusions on a checkered steel plate according to claim 1, wherein the measuring step measures the unevenness profile over the entire length of the checkered steel plate at a preset cycle using a protrusion measuring device.

3. 3. The method for measuring protrusions on a checkered steel plate according to claim 1, wherein in the measuring step, the unevenness profile is measured by a plurality of two-dimensional laser displacement meters provided in the protrusion measuring device.

4. A protrusion measuring device for a checkered steel plate that is manufactured by rolling using a hot rolling facility and cooled by a run-out table provided on the outlet side of the hot rolling facility, a shape meter that is installed on the outlet side of the run-out table, on at least one side of the checkered steel plate on which the protrusions are formed, and that measures the unevenness profile of the checkered steel plate across the entire width of the checkered steel plate; and a processing unit that calculates the position and height of the protrusion from the unevenness profile measured by the shapemeter.

5. 5. The checkered steel plate protrusion measuring device according to claim 4, wherein the shape meter measures the unevenness profile over the entire length of the checkered steel plate at a preset cycle.

6. 6. The checkered steel plate protrusion measuring device according to claim 4, wherein the shape meter has a plurality of two-dimensional laser displacement meters installed in the width direction of the run-out table.

Images