JP2007003506A - Device for photographing surface of mill roll and control method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for photographing a surface of a mill roll in order to test the service limit of the mill roll, which improves maintenance and simplifies structure. <P>SOLUTION: The device comprises a water supplying means 10 for supplying cold water, a water column forming nozzle 30 which discharges the cold water supplied from the water supplying means 10 onto the surface of the mill roll 200 used for milling a steel plate and forms a water column 60 between its head section and the surface of the mill roll 200, and a photographing means 20 which photographs the surface of the mill roll 200 through the water column 60. Furthermore, an adjusting mechanism is disposed at the water column forming nozzle 30, which makes the head section of the water column forming nozzle 30 come close to the surface of the mill roll 200 when the amount of the cold water supplied from the water supplying means 10 is increased, and the head section of the water column forming nozzle 30 move away from the surface of the mill roll 200 when the amount of the cold water supplied from the water supplying means 10 is decreased. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a surface imaging device for a rolling roll used for rolling a steel plate and a control method therefor.

  In a steel sheet hot rolling mill, a rolling roll is worn by rolling or heat cracks are generated. For this reason, when the rolling roll reaches the service limit, the roll needs to be replaced. In general, the rolling roll is exchanged by empirically predicting the period until the roll surface deformation due to wear of the rolling roll and the rough surface of the roll due to heat cracking reach a limit. However, the wear of the rolling roll and the deformation of the roll profile may be extremely different depending on the use situation, and it is difficult to replace the rolling roll at the optimum timing.

  In order to eliminate such inconvenience, in recent years, an inspection apparatus has been devised for inspecting the use limit of the rolling roll by photographing the surface of the rolling roll (see, for example, Patent Document 1). This inspection apparatus supplies water from a nozzle to a rolling roll, forms a water column between the rolling roll and the nozzle, and takes a photographed image with a camera through the formed water column.

JP-A-5-10888

  In the inspection apparatus described in Patent Document 1, when a water column is formed between a rolling roll and a nozzle, first, a moving device (configuration “4” in FIG. 5 of Patent Document 1) is driven to form a nozzle body (Patent Document 1). The tip of “31” in FIG. 5 of Document 1 is brought into contact with the surface of the rolling roll, and this nozzle body is slightly against the biasing force of the coil spring (configuration of “32” in FIG. 5 of Patent Document 1). After disposing at the retreat position, pressurized water is supplied to the nozzle to form a water column between the rolling roll and the nozzle.

  However, since the inspection apparatus described in Patent Literature 1 includes a coil spring that biases the nozzle body forward, for example, when maintenance such as replacement of a roll or polishing is performed by stopping the supply of pressurized water. The tip of the nozzle body is disposed at the position closest to the surface of the rolling roll, and the problem arises that the tip of the nozzle body and the rolling roll collide.

  In order to avoid this, in the inspection apparatus described in Patent Document 1, for example, the above-described moving device is driven to retract the tip of the nozzle body from the rolling roll. That is, in the inspection apparatus described in Patent Literature 1, the tip of the nozzle body is positioned using not only the coil spring but also a moving device provided separately. For this reason, there has been a problem that the apparatus becomes large-scale, and the installation place is restricted in a narrow rolling stand. In addition, since the environment of the rolling stand is extremely dusty and vibrated, there is a problem that a separately provided moving device is liable to be broken and the maintenance is very troublesome.

  The present invention has been made in view of the above-described problems, and in the surface imaging device for a rolling roll for inspecting the use limit of the rolling roll, the device configuration can be simplified and the maintainability of the device is also provided. It aims to be able to improve.

  The rolling roll surface imaging device of the present invention is a water supply means for supplying water column forming water, and water column forming water supplied from the water supply means is discharged onto the surface of a rolling roll used for rolling a steel plate, A water column forming nozzle for forming a water column between a tip portion and the rolling roll; and a photographing means for photographing the surface of the rolling roll through the water column formed by the water column forming nozzle. The tip of the water column forming nozzle is brought closer to the surface of the rolling roll as the amount of water column forming water supplied from the water supply unit increases, and the amount of water column forming water supplied from the water supply unit is small. A variable mechanism is provided for retracting the tip of the water column forming nozzle from the surface of the rolling roll.

  In another aspect of the surface imaging device for a rolling roll according to the present invention, the water column forming nozzle has a tip portion higher than a rear end portion and is inclined upward or vertically, and the variable mechanism includes gravity and It is energized by the water flow in the water column forming nozzle.

  In another aspect of the roll roll surface photographing apparatus of the present invention, the variable mechanism is configured by a spring that biases the tip of the water column forming nozzle and the surface of the rolling roll to be separated from each other. .

  The control method of the surface imaging device of the rolling roll of the present invention includes: a water supply means for supplying water column forming water; and water column forming water supplied from the water supply means is discharged onto the surface of a rolling roll used for rolling a steel sheet. And a water column forming nozzle that forms a water column between the tip and the rolling roll, and a photographing means for photographing the surface of the rolling roll through the water column formed by the water column forming nozzle. The nozzle is a control method in the surface imaging device of the rolling roll provided with a variable mechanism that varies the distance between the tip of the water column forming nozzle and the surface of the rolling roll, and is supplied from the water supply means. The variation of the distance by the variable mechanism is controlled according to the amount of water column forming water, and the amount of water column forming water supplied from the water supply means increases as the amount of water increases. The distal end portion of the forming nozzle is brought close to the surface of the rolling roll, retracting the tip portion of the water column forming nozzle according water plume formation water supplied is reduced from said water supply means from the surface of the rolling roll.

  In another aspect of the method for controlling the surface imaging device for a rolling roll according to the present invention, the water column forming nozzle has a tip portion higher than a rear end portion, is inclined upward or vertically, and the variable mechanism is , Gravity and the water flow in the water column forming nozzle.

  Further, in another aspect of the control method of the roll roll surface imaging device of the present invention, the variable mechanism is configured by a spring that biases the tip of the water column forming nozzle and the surface of the rolling roll to be separated from each other. Has been.

  According to the present invention, the tip of the water column forming nozzle is brought closer to the surface of the rolling roll as the amount of water column forming water supplied from the water supply unit increases, and the amount of water column forming water supplied from the water supply unit is increased. Since the variable mechanism that retracts the tip of the water column forming nozzle from the surface of the rolling roll as it decreases, for example, when performing maintenance such as replacement or polishing of the rolling roll by stopping the supply of water column forming water, The water column forming nozzle can be retracted to a position separated from the surface of the rolling roll. Thereby, it is not necessary to separately provide a moving device for moving the water column forming nozzle, the device configuration can be simplified, and the maintainability of the device can be improved.

  In addition, since the position of the tip of the water column forming nozzle is inclined upward from the horizontal direction, the gravity applied to the tip of the water column forming nozzle and the amount of water for forming the water column supplied from the water supply means The position of the tip of the water column forming nozzle can be determined by a simple variable mechanism only in relation to (or water pressure).

  In addition, since the variable mechanism is configured with a spring that biases the tip of the water column forming nozzle and the surface of the rolling roll apart, regardless of the orientation of the tip of the water column forming nozzle, that is, Even if the tip of the water column forming nozzle is installed in the horizontal direction or inclined downward from the horizontal direction, the spring and the water amount (or water pressure) of the water for forming the water column supplied from the water supply means The position of the tip of the water column forming nozzle can be determined only by the relationship.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram showing a schematic configuration of a surface imaging apparatus for a rolling roll according to a first embodiment of the present invention.

  In the surface imaging device 100 of the rolling roll of FIG. 1, 10 is a water supply means for supplying water column forming water. The water supply means 10 was adjusted by a water supply unit 11 serving as a supply source of water column forming water, a water amount adjusting valve 12 for adjusting the amount of water column forming water supplied from the water supply unit 11, and a water amount adjusting valve. A water meter 13 for measuring the amount of water for forming a water column is provided.

  In the surface imaging device 100 of the rolling roll of FIG. 1, 30 discharges the water for water column formation supplied from the water supply means 10 to the surface of the rolling roll 200 used for rolling a steel plate, and the front-end | tip and the rolling roll 200 are discharged. It is a water column formation nozzle which forms the water column 60 between the surface.

  The water column forming nozzle 30 is configured to include a nozzle base 34 fixed to the camera box 21 and a nozzle tip 35 that is moved forward by water column forming water supplied from the water supply means. Further, the nozzle base 34 includes a water inlet 31 for injecting water column forming water supplied from the water supply means 10. The nozzle tip 35 is provided with a stopper 33.

  The stopper 33 prevents the rear end of the nozzle tip 35 from moving backward from the nozzle inlet 31 even when the nozzle tip 35 is most retracted from the surface of the rolling roll 200, that is, the nozzle tip 35 is most retracted. Even in this case, the water column forming water injected from the nozzle inlet 31 serves as an abutting portion so as to be supplied to the rear end side of the nozzle front end portion 35.

  The stopper 33 does not necessarily have to be attached to the nozzle tip portion 35 as long as it performs the above function. For example, the stopper 33 is attached to the nozzle base portion 34 so that the nozzle tip portion 35 is not retracted beyond a certain position. There may be.

  In the rolling roll surface imaging apparatus 100 in FIG. 1, reference numeral 20 denotes imaging means for imaging the surface of the rolling roll 200 through the water column 60 formed by the water column forming nozzle 30.

  The photographing means 20 is provided in the camera box 21 having the transparent window 24, the illumination unit 23 that is provided in the camera box 21, and illuminates the surface of the rolling roll 200 through the transparent window 24, and is provided in the camera box 21. The photographing unit 22 is configured to be driven in synchronization with the lighting of the unit 23 and to photograph the surface of the rolling roll 200 through the transparent window 24 and the water column 60.

  In the rolling roll surface imaging apparatus 100 in FIG. 1, reference numeral 40 denotes an imaging control apparatus that controls overall imaging such as lighting control of the illumination unit 23 and drive control of the imaging unit 22. In addition, in the imaging control device 40, the captured image of the surface of the rolling roll 200 captured by the imaging unit 22 has an inappropriate distance between the tip of the water column forming nozzle 30 and the surface of the rolling roll 200 and the water column 60 is formed. Or when the water column 60 is formed but the water column 60 having a thickness sufficient for photographing is not formed and the image quality of the photographed image is inappropriate. And has a function of controlling the water supply amount of the water column forming water to the water supply means 10.

  1, 50 is an image processing apparatus that performs a recording process, a display process, and the like on a photographed image of the surface of the rolling roll 200 photographed by the photographing unit 22.

  Next, operation | movement of the water column formation nozzle 30 in 1st Embodiment is demonstrated using FIG.2 and FIG.3.

  First, the operation of the water column forming nozzle 30 in the first embodiment when photographing the surface of the rolling roll 200 will be described with reference to FIG. In FIG. 2, the rolling roll 200 is operating and rotating at a predetermined speed. Here, the water column forming nozzle 30 is arranged in an orientation that forms an angle of 30 degrees upward from the horizontal, for example, from the horizontal to the upward.

  First, the movable range (stroke) of the water column forming nozzle 30 with respect to the amount of water for forming the water column is measured in advance. Further, when water column forming water is discharged from the water column forming nozzle 30 to the surface of the rolling roll 200, the distance from the surface of the rolling roll 200 capable of stably forming the water column 60 is also measured.

  Then, the water column forming nozzle 30 is installed at a predetermined position in consideration of the measured movable range of the water column forming nozzle 30 and the distance from the surface of the rolling roll 200 capable of stably forming the water column 60. Specifically, in order to avoid contact with the surface of the rolling roll 200, the distance from the surface of the rolling roll 200 is separated by more than the movable range of the water column forming nozzle 30, and at least the nozzle tip 35 is the most on the surface of the rolling roll 200. When approaching, the water column forming nozzle 30 is installed at a position where a distance capable of stably forming the water column 60 with the surface of the rolling roll 200 can be secured.

  Then, when water column forming water of a predetermined amount or more is supplied from the water supply means 10 to the water column forming nozzle 30 arranged as described above, water pressure corresponding to the amount of water column forming water supplied is water column forming. The nozzle tip 35 moves inside the nozzle 30 in the direction indicated by 30a (the direction approaching the surface of the rolling roll 200). Thereby, a water column 60 is formed between the surface of the rolling roll 200 rotating at a predetermined speed and the tip of the nozzle tip 35. In this state, the surface of the rolling roll 200 is photographed by the photographing means 20 through the formed water column 60.

  Next, the operation of the water column forming nozzle 30 in the first embodiment when the photographing of the surface of the rolling roll 200 is finished will be described with reference to FIG.

  When the photographing of the surface of the rolling roll 200 by the photographing unit 20 is finished, the water column forming water supplied from the water supply unit 10 is stopped. Thereby, the pressure in the water column formation nozzle 30 falls.

  Here, the nozzle tip 35 of the water column forming nozzle 30 is freely slidable with the nozzle base 34 so as to be able to move forward or backward, and the water column forming nozzle 30 is directed upward from the horizontal direction. For this reason, due to the gravity applied to the nozzle tip 35, the nozzle tip 35 is constantly applied with a force to retreat. For this reason, the nozzle tip 35 moves in the direction indicated by 30b (the direction in which it retreats from the surface of the rolling roll 200). The nozzle tip 35 moves to a position where the nozzle base 34 and the stopper 33 abut against each other.

(Second Embodiment)
Next, operation | movement of the water column formation nozzle 30 in 2nd Embodiment is demonstrated using FIG.4 and FIG.5.

  In the present embodiment, as shown in FIGS. 4 and 5, a spring 32 is arranged between the nozzle base 34 and the nozzle tip 35 constituting the water column forming nozzle 30. The spring 32 brings the nozzle tip 35 closer to the surface of the rolling roll 200 as the amount of water column forming water supplied from the water supply unit 10 increases, and the amount of water column forming water supplied from the water supply unit 10 is increased. The nozzle tip 35 is retracted from the surface of the rolling roll 200 as it decreases. Here, the spring 32 of the present embodiment biases the nozzle tip portion 35 and the surface of the rolling roll 200 so as to separate them.

  First, the operation of the water column forming nozzle 30 in the second embodiment when photographing the surface of the rolling roll 200 will be described with reference to FIG. Here, the rolling roll 200 shown in FIG. 4 is operating and rotating at a predetermined speed.

  First, the movable range (stroke) of the water column forming nozzle 30 with respect to the amount of water for forming the water column is measured in advance. Further, when water column forming water is discharged from the water column forming nozzle 30 to the surface of the rolling roll 200, the distance from the surface of the rolling roll 200 capable of stably forming the water column 60 is also measured.

  Then, the water column forming nozzle 30 is installed at a predetermined position in consideration of the measured movable range of the water column forming nozzle 30 and the distance from the surface of the rolling roll 200 capable of stably forming the water column 60. Specifically, in order to avoid contact with the surface of the rolling roll 200, the distance from the surface of the rolling roll 200 is separated by more than the movable range of the water column forming nozzle 30, and at least the nozzle tip 35 is the most on the surface of the rolling roll 200. When approaching, the water column forming nozzle 30 is installed at a position where a distance capable of stably forming the water column 60 with the surface of the rolling roll 200 can be secured.

  Then, when water column forming water of a predetermined amount or more is supplied from the water supply means 10 to the water column forming nozzle 30 arranged as described above, water pressure corresponding to the amount of water column forming water supplied is water column forming. The spring 32 contracts inside the nozzle 30 and the nozzle tip 35 moves in the direction indicated by 30a (the direction approaching the surface of the rolling roll 200). Thereby, a water column 60 is formed between the surface of the rolling roll 200 rotating at a predetermined speed and the tip of the nozzle tip 35. In this state, the surface of the rolling roll 200 is photographed by the photographing means 20 through the formed water column 60.

  Next, the operation of the water column forming nozzle 30 in the second embodiment when the photographing of the surface of the rolling roll 200 is finished will be described with reference to FIG.

  When the photographing of the surface of the rolling roll 200 by the photographing unit 20 is finished, the water column forming water supplied from the water supply unit 10 is stopped. Thereby, since the pressure in the water column forming nozzle 30 is reduced, the spring 32 is extended, and the nozzle tip 35 moves in the direction indicated by 30b (the direction retreating from the surface of the rolling roll 200). The nozzle tip 35 moves to a position where the nozzle base 34 and the stopper 33 abut against each other.

  Next, a result of actual photographing using the surface photographing device 100 of the rolling roll will be described. As for the following, the same result was obtained also in the first embodiment and the second embodiment.

  Here, a nozzle having a stroke of 50 mm and an inner diameter of 25 mm was used as the water column forming nozzle 30. Moreover, the roll 200 corresponding to a roll diameter of 770 mm to 800 mm was used.

  In the water column forming nozzle 30 having an inner diameter of 25 mm, the water column 60 could be stably formed if the distance between the nozzle tip 35 and the surface of the rolling roll 200 was in the range of 1 mm to 30 mm. Further, in the water column forming nozzle 30, when the amount of water supplied from the water supply means 10 is 5 liters or less per minute, the nozzle base 34 and the stopper 33 come into contact with each other as shown in FIGS. Is the position most retracted from the surface of the rolling roll 200, and when the amount of water supplied from the water supply means 10 is 40 liters per minute or more, the nozzle tip 35 is the position closest to the surface of the rolling roll 200. It became. And as a result of having image | photographed with the imaging | photography means 300 by making the rotational peripheral speed of the rolling roll 200 into 0-300m / min, it was confirmed that the clear picked-up image of the surface of the rolling roll 200 is obtained.

  Next, an example of the procedure of the method for photographing the surface of the rolling roll of the present invention will be described with reference to the flowchart of FIG. Each step in this flowchart is performed by, for example, the imaging control device 40.

  As shown in FIG. 6, the start of operation is first determined in step S41. As a result of this determination, if the operation is started, the process proceeds to step S42, and water column forming water is supplied from the water supply means 10 to the water column forming nozzle 30 as described above.

  Next, it progresses to step S43 and it is judged whether the space | interval of the nozzle front-end | tip part 35 and the surface of the rolling roll 200 is appropriate. As a result of the determination, if the interval is not appropriate, the process proceeds to step S44 to increase the amount of water for forming the water column supplied from the water supply means 10 so that the nozzle tip 35 is brought closer to the surface of the rolling roll 200. To. In the embodiment of the present invention, since the amount of water supply for forming water column is controlled to gradually increase, the interval between the nozzle tip 35 and the surface of the rolling roll 200 is determined as a result of the determination in step S43. It is controlled not to be too close.

  If the interval between the nozzle tip 35 and the surface of the rolling roll 200 becomes appropriate as a result of increasing the supply amount of water for forming the water column, the process proceeds to step S45, and the surface of the rolling roll 200 is imaged by the imaging means 20. To judge whether the image quality is good or bad. This is a process performed for confirming that a good image quality may not be obtained when the water column 60 is not formed with a sufficient thickness.

  As a result of the determination in step S45, if the image quality is insufficient, the process proceeds to step S46, where the amount of water for forming the water column supplied from the water supply means 10 is increased so that an appropriate water column 60 can be formed.

  As a result of the determination in step S45, if a good image quality is obtained, the process proceeds to step S47, and the surface state of the rolling roll 200 is photographed. Whether or not the operation is finished is determined in step S48 between the photographings, and the surface state of the rolling roll 200 is photographed until the operation finishing operation is performed. As a result of the determination in step S48, when the operation end operation is performed, as described above, the water column forming water supplied from the water supply means 10 to the water column forming nozzle 30 is stopped, and the nozzle tip 35 is rolled. The operation is stopped by retreating from the surface of the roll 200. Thereafter, maintenance such as replacement and polishing of the rolling roll 200 is performed as necessary.

  According to the embodiment of the present invention, the nozzle tip 35 is brought closer to the surface of the rolling roll 200 as the amount of water for forming the water column supplied from the water supply unit 10 increases, and the water column supplied from the water supply unit 10 is used. Since the variable mechanism for retracting the nozzle tip 35 from the surface of the rolling roll 200 as the amount of forming water decreases, for example, maintenance such as replacement or polishing of the rolling roll 200 by stopping the supply of water column forming water. When performing, the water column forming nozzle 30 can be retracted to a position separated from the surface of the rolling roll 200. Thereby, it is not necessary to separately provide a moving device for moving the water column forming nozzle 30, the device configuration can be simplified, and the maintainability of the device can be improved.

  Further, since the nozzle tip 35 is installed with the position inclined upward from the horizontal direction, the gravity applied to the nozzle tip 35 and the amount of water (or water pressure) for forming the water column supplied from the water supply means 10. The position of the nozzle tip portion 35 can be determined only by the relationship.

  Further, a spring 32 is provided between the nozzle base 34 and the nozzle tip 35 constituting the water column forming nozzle 30, and the spring 32 is urged so as to separate the nozzle tip 35 and the surface of the rolling roll 200 from each other. Thus, the position of the nozzle tip 35 can be determined only by the relationship between the spring and the amount (or water pressure) of the water for forming the water column supplied from the water supply means 10. In the inspection apparatus described in Patent Document 1, the position of the nozzle tip is determined by the repulsive force based on the force exerted on the surface of the rolling roll of pressurized water ejected from the nozzle tip, so that the coil spring and the supply are supplied. In relation to the pressurized water, the position of the tip of the nozzle is not determined, and varies depending on the rotation speed of the rolling roll, its size, its surface condition, and the like. Furthermore, in the inspection apparatus described in Patent Document 1, even if the water column forming water supplied from the water supply means 10 is stopped, the effect of retracting the water column forming nozzle to a position separated from the surface of the rolling roll cannot be obtained. .

It is the figure which showed schematic structure of the surface imaging device of the rolling roll concerning the 1st Embodiment of this invention. It is the schematic for demonstrating operation | movement of the water column formation nozzle in 1st Embodiment. It is the schematic for demonstrating operation | movement of the water column formation nozzle in 1st Embodiment. It is the schematic for demonstrating operation | movement of the water column formation nozzle in 2nd Embodiment. It is the schematic for demonstrating operation | movement of the water column formation nozzle in 2nd Embodiment. It is a flowchart explaining the outline of the procedure of the surface imaging | photography method of a rolling roll.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Water supply means 11 Water supply part 12 Water quantity adjustment valve 13 Water meter 20 Imaging means 21 Camera box 22 Imaging part 23 Illumination part 24 Transparent window 30 Water column formation nozzle 31 Water inlet 32 Spring (variable mechanism)
33 Stopper 34 Nozzle base 35 Nozzle tip 40 Imaging control device 50 Image processing device 60 Water column 100 Roll roll surface imaging device 200 Rolling roll

Claims (6)

Water supply means for supplying water for forming a water column;
A water column forming nozzle that discharges water for forming a water column supplied from the water supply means to the surface of a rolling roll used to roll a steel sheet, and forms a water column between the tip and the rolling roll;
Photographing means for photographing the surface of the rolling roll through the water column formed by the water column forming nozzle;
In the water column forming nozzle, the tip of the water column forming nozzle approaches the surface of the rolling roll as the amount of water for forming the water column supplied from the water supply unit increases, and the water column supplied from the water supply unit An apparatus for photographing a surface of a rolling roll, comprising a variable mechanism for retracting the tip of the water column forming nozzle from the surface of the rolling roll as the amount of forming water decreases.   The water column forming nozzle has a tip portion higher than a rear end portion, and is inclined upward or vertically, and the variable mechanism is biased by gravity and a water flow in the water column forming nozzle. The surface imaging device of a rolling roll according to claim 1.   2. The roll roll surface photographing device according to claim 1, wherein the variable mechanism is configured by a spring that biases the tip of the water column forming nozzle and the surface of the rolling roll to be separated from each other. . Water supply means for supplying water column forming water, and water column forming water supplied from the water supply means is discharged onto the surface of a rolling roll used for rolling the steel sheet, and the water column is provided between the tip and the rolling roll. And a photographing means for photographing the surface of the rolling roll through the water column formed by the water column forming nozzle,
The water column forming nozzle is a control method in the surface imaging device of the rolling roll provided with a variable mechanism that varies the distance between the tip of the water column forming nozzle and the surface of the rolling roll,
The change of the distance by the variable mechanism is controlled in accordance with the amount of water column forming water supplied from the water supply unit, and the water column forming nozzle increases as the amount of water column forming water supplied from the water supply unit increases. A tip portion is brought close to the surface of the rolling roll, and the tip portion of the water column forming nozzle is retreated from the surface of the rolling roll as the amount of water for forming the water column supplied from the water supply means decreases. A method for controlling a surface imaging device of a rolling roll.   The water column forming nozzle has a tip portion higher than a rear end portion, and is inclined upward or vertically, and the variable mechanism is biased by gravity and a water flow in the water column forming nozzle. The control method of the surface imaging device of the rolling roll of Claim 4.   5. The rolling roll surface imaging device according to claim 4, wherein the variable mechanism is configured by a spring that urges the tip of the water column forming nozzle and the surface of the rolling roll to be separated from each other. Control method.

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