JP5699830B2 - Roll brush method - Google Patents

Description

  The present invention relates to a brush method for beautifying the surface of a roll (for example, a roll of a skin pass mill).

  The continuous pickling line delivers the material efficiently by joining the front and back materials with a welding machine and performs the pickling work.

  From 1970 to 1990, the pickling line has been used mainly for the purpose of removing the black skin scale layer of the surface layer after rolling. Since then, against the background of the demand for productivity improvement, a technique has been developed that cracks the scale layer of the material surface layer to improve the descaling ability and promote pickling performance. Skin pass mills and tension levelers are known as equipment that can improve descaling ability.

In 2000, demand for energy saving (lightening of vehicles) increased mainly in the automobile industry, and the production ratio of high-tensile steel (TS ≧ 60 kg / mm ² ) increased. As these high-strength steel materials increase, the pickling line is required to have not only pickling properties but also high shape straightening ability. As a result, the rolling load of the skin pass mill as the shape straightening equipment is increased and the tension leveler is increased. It has undergone changes in operating conditions, such as an increase in the rate of growth in Japan.

  As a result of these measures, while improving pickling performance and shape straightening ability, while using descaling equipment (skin pass mill, tension leveler) installed on the entrance side of the pickling tank, Due to an increase in the amount of peeling scale that scatters, there is an increasing concern about quality defects on the front and back surfaces of the product due to foreign matter biting into the roll of the descaling equipment (foreign matter adhesion). Representative examples of the foreign matter (adhering foreign matter) to be caught in the roll include (a) a relatively large scale piece that has been peeled off, (b) fine powder, (c) sticky oil and fat, and the like.

  Therefore, techniques for beautifying the roll surface of the descaling equipment have been developed (see Patent Documents 1 to 4). For example, as shown in FIG. 14, the roll surface of the roll of the skin pass mill 10 (upper work roll 11, upper backup roll 12, lower work roll 13, lower backup roll 14) is rotated by a rotating brush 18 that rotates in the anti-roll rotation direction. Is a way to beautify. In addition, as shown in FIG. 15, a linear brush (non-rotating brush) 19 may be used instead of the rotating brush 18. The linear brush 19 is a brush having a toothbrush shape and pressed against a roll.

  Here, the rotating brush cleans the roll by a brushing operation, whereas the linear brush cleans the roll by a wiping operation.

  The rotating brush works effectively (can be removed) on the fine powder (b) among the above foreign matters, whereas the linear brush (a) is relatively separated from the above foreign matters. It is empirically known that it works effectively (can be removed) on large scale pieces and (c) sticky fats and oils.

  For this reason, conventionally, for a roll of a skin pass mill installed on the entrance side of a pickling tank, (a) a linear brush that works effectively on a relatively large scale piece separated is often used. It was.

JP-A-6-254610 JP 2005-254294 A Special table 2007-533454 gazette Special table 2009-502519

  In recent years, with the increase in the production of high-tensile steel materials, Si-based high-tensile steel materials (Si ≧ 0.3 mass%) have increased in the pickling line.

  However, Si-based high-strength steel (Si ≧ 0.3% by mass) has an infinite number of powdery red scales on its surface, and the skin pass mill roll was wiped with a straight brush. As mentioned above, the straight brush is not suitable for removing fine powder, so the powdery red scale bites into (attaches to) the skin pass mill roll, and Si-based high tension. At the beginning of the passing of the steel material (Si ≧ 0.3 mass%), a roll wrinkle of about 1 mm × 1 mm is generated on the product surface, and the Si-based high-tensile steel material (Si ≧ 0.3 mass%) continues. ) It has been found that innumerable roll wrinkles are generated on the surface of the product when passing through.

  Therefore, for Si-based high-strength steel (Si ≧ 0.3 mass%), shape correction with a skin pass mill installed in the pickling line and cracking of the scale layer are not performed, and shape correction with a skin pass mill on another line The scale layer was cracked, and the pickling line was operated to be charged into the pickling tank without using a skin pass mill. As a result, the Si-based high-strength steel (Si ≧ 0.3 mass%) passed through a plurality of lines, and the yield and work cost were constantly inferior.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a brush method capable of accurately beautifying the surface of a roll such as a skin pass mill installed in a pickling line. To do.

  In order to solve the above problems, the present invention has the following features.

  [1] A brush method for beautifying the surface of a roll, wherein the rotation is performed according to the type of foreign matter adhering to the surface of the roll by using a brush device having both a rotating brush and a linear brush. A roll brush method characterized by using a brush and the straight brush separately.

  [2] When the steel material passing through the roll is a high-tensile steel material having an Si content of 0.3% by mass or more, the rotating brush is used, and the steel material passing through the roll has an Si content of less than 0.3% by mass. The roll brush method according to [1], wherein the straight brush is used in the case of high-tensile steel.

  In this invention, the surface of rolls, such as a skin pass mill installed in the pickling line, can be accurately beautified.

It is a figure which shows the brush apparatus in Embodiment 1 of this invention. It is a figure which shows an example of arrangement | positioning of the brush in Embodiment 1 of this invention. It is a figure which shows the other example of arrangement | positioning of the brush in Embodiment 1 of this invention. It is a figure which shows the brush apparatus in Embodiment 2 of this invention. It is a figure which shows operation | movement of the brush apparatus in Embodiment 2 of this invention. It is a figure which shows operation | movement of the brush apparatus in Embodiment 2 of this invention. It is a figure which shows operation | movement of the brush apparatus in Embodiment 2 of this invention. It is a figure which shows operation | movement of the brush apparatus in Embodiment 2 of this invention. It is a figure which shows the brush apparatus in Embodiment 3 of this invention. It is a figure which shows operation | movement of the brush apparatus in Embodiment 3 of this invention. It is a figure which shows operation | movement of the brush apparatus in Embodiment 3 of this invention. It is a figure which shows operation | movement of the brush apparatus in Embodiment 3 of this invention. It is a figure which shows operation | movement of the brush apparatus in Embodiment 3 of this invention. It is a figure which shows a prior art (rotary brush). It is a figure which shows a prior art (straight line brush).

  As described above, the foreign matter (adhering foreign matter) that bites into a roll such as a skin pass mill includes (a) a relatively large scale piece that has been peeled off, (b) fine powdery powder, (c) sticky oil and fat, etc. The rotary brush works effectively (can be removed) among the foreign substances (b) among the above-mentioned foreign substances, whereas the linear brush (a) compares the separated foreign substances. Effectively works (can be removed) on large scale pieces and (c) sticky oils and fats.

  Therefore, in the present invention, as a brush method for beautifying the surface of the roll, a brush device having both a rotating brush and a linear brush is used, and the rotating brush is used according to the type of foreign matter adhering to the surface of the roll. The surface of the roll can be accurately beautified by properly using a straight brush and a straight brush.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, the case of applying to the upper work roll of the skin pass mill is taken as an example.

[Embodiment 1]
FIG. 1 is a diagram showing a brush device 20 used in Embodiment 1 of the present invention.

  As shown in FIG. 1, the brush device 20 used in the first embodiment includes a rotating brush portion 21 and a linear brush portion 27. The rotating brush unit 21 includes a rotating brush 22 and a rotating brush moving cylinder 23 that moves (advances / retreats) the rotating brush 22 toward the surface of the roll 11. A linear brush 28 and a linear brush moving cylinder 29 for moving (advancing / retreating) the linear brush 28 toward the surface of the roll 11 are provided.

  Here, with respect to the installation positions of the rotary brush portion 21 and the linear brush portion 27, as shown in FIG. 2, the rotation center of the rotary brush 22 is on an extension of the direction line in which the rotation center moves forward and backward (that is, the rotary brush moving cylinder 23). A direction line in which the center O of the roll 11 is positioned so that the center portion of the linear brush 28 moves forward and backward (that is, a direction line in which the linear brush moving cylinder 29 extends) The rotation center of the rotary brush 22 is made parallel to the direction line in which the rotation brush 22 moves forward and backward (that is, the direction line in which the rotary brush moving cylinder 23 extends), or as shown in FIG. So that the center O of the roll 11 is positioned on the extension line of the direction line in which the central portion of the roll moves forward and backward (that is, on the extension line of the direction line in which the linear brush moving cylinder 29 extends). The direction line in which the rotation center of the rotary brush 22 advances / retreats (that is, the direction line in which the rotary brush moving cylinder 23 extends) is the direction line in which the central portion of the linear brush 28 advances / retreats (that is, linear brush movement). It can be considered that the cylinder 29 is parallel to the extending direction line).

  As shown in FIG. 2, considering that the rotary brush 22 beautifies the roll 11 by a brushing operation, and the straight brush 28 beautifies the roll 11 by a wiping operation. It is preferable that the center O of the roll 11 be positioned on an extension line of a direction line in which the rotation center of the rotary brush 22 advances / retreats (on an extension line of a direction line in which the rotary brush moving cylinder 23 extends). . At that time, the direction line in which the linear brush 28 advances / retreats (direction line in which the linear brush moving cylinder 29 extends) is the direction line in which the rotation center of the rotating brush 22 advances / retreats (the rotating brush moving cylinder 23 has The distance (offset amount) δ away from the stretching direction line) is preferably 160 mm or less.

  In the brush device 20 configured as described above, the rotary brush 22 and the linear brush 27 are selectively used in accordance with the type of foreign matter (attached foreign matter) biting into the roll 11.

  That is, when the steel material passing through the roll 11 has a large amount of fine powder as foreign matter to be caught in the roll 11, for example, a high-tensile steel material having a Si content of 0.3 mass% or more, The rotating brush 22 that works effectively is used, the rotating brush moving cylinder 23 is extended, the rotating brush 22 is pressed against the surface of the roll 11, and the surface of the roll 11 is brushed.

  On the other hand, when the steel material that passes through the roll 11 has many relatively large scale pieces that have peeled off as foreign matter that bite into the roll 11, for example, a high-tensile steel material having an Si content of less than 0.3 mass%. Then, the linear brush 28 that works effectively is used, the linear brush moving cylinder 29 is stretched, the linear brush 28 is pressed against the surface of the roll 11, and the surface of the roll 11 is wiped.

  Further, when there are a large amount of fine powder and a relatively large scale piece separated as foreign matter to be caught in the roll 11, or when there are a lot of sticky oils and fats, the rotary brush 22 and the linear brush 28 Both are used, the rotating brush moving cylinder 23 is stretched, the rotating brush 22 is pressed against the surface of the roll 11 to brush the surface of the roll 11, and the linear brush moving cylinder 29 is stretched. Then, the linear brush 28 is pressed against the surface of the roll 11 and the surface of the roll 11 is wiped.

  In this way, in the first embodiment, the surface of the roll 11 can be accurately beautified.

[Embodiment 2]
The brush device 20 used in Embodiment 1 of the present invention shown in FIGS. 1 to 3 has a structure in which two independent moving cylinders, a rotating brush moving cylinder 23 and a linear brush moving cylinder 29, are arranged in parallel. However, when installed on the upper work roll 11 of the skin pass mill 10, it interferes with other devices (for example, the rear rail of the upper work roll 11 and the chock of the upper backup roll 12) and becomes independent. There may be a case where a space for installing the two moving cylinders in parallel cannot be secured.

  Therefore, in the second embodiment, the apparatus is downsized to avoid interference with other apparatuses.

  FIG. 4 is a diagram showing the brush device 30 used in Embodiment 2 of the present invention.

  As shown in FIG. 4, the brush device 30 used in the second embodiment includes a rotating brush portion 31 including a rotating brush 32 and a holding member 33 that holds the rotating brush 32, and the rotating brush portion 31 is connected to the roll 11. A rotating brush part moving cylinder 34 that moves (advances / retreats) toward the surface, an entire moving cylinder 35 that moves (advances / retreats) the rotating brush part moving cylinder 34 toward the surface of the roll 11, and a straight line A linear brush portion 37 including a brush 38 and a linear brush moving cylinder 39 for moving (advancing / retreating) the linear brush 38 toward the surface of the roll 11 is provided. The linear brush moving cylinder 39 is attached to the holding member 33.

  Here, with respect to the installation positions of the rotary brush portion 31 and the linear brush portion 37, the rotation center of the rotary brush 32 is on an extension of the direction line in which the rotation center moves forward and backward (that is, the rotary brush portion moving cylinder 34 and the entire moving cylinder 35). The center line O of the roll 11 is positioned on the extension line of the direction line in which the linear brush 38 extends, and the direction line in which the central portion of the linear brush 38 advances / retreats (that is, the direction line in which the linear brush moving cylinder 39 extends) is The rotation center of the rotary brush 32 is made to be parallel to the direction line in which the rotation brush 32 moves forward and backward (that is, the direction line in which the rotary brush portion moving cylinder 34 and the entire moving cylinder 35 extend), or the linear brush 38. Roll 11 on the extension line of the direction line in which the central part of the roller moves forward and backward (that is, on the extension line of the direction line in which the linear brush moving cylinder 39 extends). The direction line in which the center O is positioned and the rotation center of the rotary brush 32 advances / retreats (that is, the direction line in which the rotary brush portion moving cylinder 34 and the overall moving cylinder 35 extend) is the center of the linear brush 38. It is conceivable to make the part parallel to a direction line in which the part moves forward and backward (that is, a direction line in which the linear brush moving cylinder 39 extends).

  In this regard, as described in the first embodiment, the rotating brush 32 beautifies the roll 11 by a brushing operation, and the linear brush 38 beautifies the roll 11 by a wiping operation. Considering this, in the second embodiment, on the extension line of the direction line in which the rotation center of the rotary brush 32 advances / retreats (on the extension line of the direction line in which the rotary brush portion moving cylinder 34 and the entire moving cylinder 35 extend). The center O of the roll 11 is positioned. At this time, the direction line in which the linear brush 38 advances / retreats (direction line in which the linear brush moving cylinder 39 extends) is the direction line in which the rotation center of the rotating brush 32 advances / retreats (rotating brush moving cylinder 34 and The distance (offset amount) δ away from the overall movement cylinder 35 (direction line) is preferably 160 mm or less.

  And in the brush apparatus 30 comprised as mentioned above, the roll 11 surface is beautified by the following operations.

  First, when the roll 11 is replaced, the rotary brush 32 and the linear brush 38 are positioned at the standby position shown in FIG. That is, the rotary brush portion moving cylinder 34 is retracted to its retracting limit, and the entire moving cylinder 35 is retracted to its retracting limit. The linear brush moving cylinder 39 is also retracted to its retract limit.

  Next, when the rearrangement of the roll 11 is completed, the rotary brush 32 and the linear brush 38 are positioned at the preparation positions shown in FIG. That is, the entire moving cylinder 35 is advanced to its forward limit while the rotary brush portion moving cylinder 34 is retracted to its backward limit. Note that the linear brush moving cylinder 39 remains retracted to its retract limit.

  Thereafter, the rotary brush 32 and the linear brush 38 are selectively used in accordance with the type of foreign matter (attached foreign matter) to be bitten into the roll 11 from the state where it is located at the preparation position shown in FIG.

  That is, when the steel material passing through the roll 11 has a large amount of fine powder as foreign matter to be caught in the roll 11, for example, a high-tensile steel material having a Si content of 0.3 mass% or more, As shown in FIG. 6, the rotating brush 32 moving cylinder 34 is stretched and the rotating brush 32 is pressed against the surface of the roll 11 to brush the surface of the roll 11 (scraping). I do.

  On the other hand, when the steel material that passes through the roll 11 has many relatively large scale pieces that have peeled off as foreign matter that bite into the roll 11, for example, a high-tensile steel material having an Si content of less than 0.3 mass%. Then, the linear brush 38 that works effectively is used, and as shown in FIG. 7, the linear brush moving cylinder 39 is stretched and the linear brush 38 is pressed against the surface of the roll 11 to wipe the surface of the roll 11 (wiping). I do.

  In addition, when there are a large amount of fine powder and a relatively large scale piece separated as foreign matter to be caught in the roll 11, or when there are a lot of sticky oils and fats, the rotation brush 32 and the linear brush 38 As shown in FIG. 8, the rotating brush part moving cylinder 34 is stretched and the rotating brush 32 is pressed against the surface of the roll 11, and then the linear brush moving cylinder 39 is stretched to linearly move. The brush 38 is pressed against the surface of the roll 11. Thus, the surface of the roll 11 is brushed with the rotating brush 32 and the surface of the roll 11 is wiped with the linear brush 38.

  In this way, in the second embodiment, the surface of the roll 11 is accurately cleaned while avoiding interference with other devices (for example, the rear rail of the upper work roll 11 and the chock of the upper backup roll 12). Can be

[Embodiment 3]
The brush device 30 used in Embodiment 2 of the present invention shown in FIGS. 4 to 8 has a structure in which two moving cylinders, a rotating brush portion moving cylinder 34 and an entire moving cylinder 35, are arranged in series. However, when it is installed on the upper work roll 11 of the skin pass mill 10, the mechanism for holding the guide frames (not shown) of the two moving cylinders may become heavy and cannot be reduced in size and weight. is there.

  Therefore, in the third embodiment, the operation of the two moving cylinders, the rotating brush portion moving cylinder 34 and the entire moving cylinder 35, is performed by one moving cylinder, thereby reducing the size and weight of the apparatus. It tries to make it.

  FIG. 9 is a diagram showing a brush device 40 used in Embodiment 3 of the present invention.

  As shown in FIG. 9, the brush device 40 used in the third embodiment includes a rotating brush portion 41 including a rotating brush 42 and a holding member 43 that holds the rotating brush 42, and the rotating brush portion 41 of the roll 11. A rotating brush portion moving cylinder 44 that moves (advances / retreats) toward the surface, and a stopper mechanism (stopper portion 45, for stopping and holding the rod extending position of the rotating brush portion moving cylinder 44 at a predetermined position) The linear brush portion 47 includes a stopper receiving member 46, a linear brush 48, and a linear brush moving cylinder 49 that moves (advances / retreats) the linear brush 48 toward the surface of the roll 11. The linear brush moving cylinder 49 is attached to the holding member 43.

  As for the stopper mechanism, the stopper portion 45 has a stopper 45a and a stopper moving cylinder 45b that moves (advances / retreats) the stopper 45a toward the rotating brush portion moving cylinder 44. The receiving member 46 is attached so as to move together with the extension of the rod of the rotating brush portion moving cylinder 44, and the tip of the stopper receiving member 46 is a stopper receiving 46a.

  Here, with respect to the installation positions of the rotary brush portion 41 and the linear brush portion 47, the extension center line of the rotary brush 42 moves forward and backward (that is, the direction line in which the rotary brush portion moving cylinder 44 extends). A direction line in which the center O of the roll 11 is positioned on the extension line) and the central portion of the linear brush 48 advances / retreats (that is, a direction line in which the linear brush moving cylinder 49 extends) is the rotation of the rotary brush 42. Make the center parallel to the direction line in which the center moves forward and backward (that is, the direction line in which the rotating brush moving cylinder 44 extends), or extend the direction line in which the central part of the linear brush 48 moves forward and backward The center O of the roll 11 is positioned on the line (that is, on the extension line of the direction line in which the linear brush moving cylinder 49 extends), and the rotation center of the rotary brush 42 is the front. A retreating direction line (that is, a direction line in which the rotating brush portion moving cylinder 44 extends) is a direction line in which the central portion of the linear brush 48 moves forward and backward (that is, a direction line in which the linear brush moving cylinder 49 extends). ) To be parallel to.

  With respect to this, as described in the first and second embodiments, the rotating brush 42 beautifies the roll 11 by a brushing operation, and the linear brush 48 beautifies the roll 11 by a wiping operation. In consideration of this, also in the third embodiment, the center of the roll 11 is on the extension line of the direction line in which the rotation center of the rotary brush 42 advances / retreats (on the extension line of the direction line in which the rotary brush unit moving cylinder 44 extends). O is positioned. At this time, the direction line in which the linear brush 48 advances / retreats (the direction line in which the linear brush moving cylinder 49 extends) is the direction line in which the rotation center of the rotating brush 42 advances / retreats (the rotating brush moving cylinder 44 has The distance (offset amount) δ away from the stretching direction line) is preferably 160 mm or less.

  And in the brush apparatus 40 comprised as mentioned above, the roll 11 surface is beautified by the following operations.

  First, when the roll 11 is replaced, the rotating brush 42 and the linear brush 48 are positioned at the standby position shown in FIG. That is, the rotary brush portion moving cylinder 44 is retracted to its retract limit. At that time, the stopper moving cylinder 45b is moved backward so that the stopper 45a does not contact the stopper receiver 46a. The linear brush moving cylinder 49 is also retracted to its retract limit.

  Next, when the rearrangement of the roll 11 is completed, the rotary brush 42 and the linear brush 48 are positioned at the preparation position shown in FIG. That is, the rotary brush portion moving cylinder 44 is advanced to a predetermined position (preparation position). Then, the stopper moving cylinder 45b is advanced, the stopper 45a is brought into contact with the stopper receiver 46a, and the rod of the rotating brush portion moving cylinder 44 is stopped and held at that position (preparation position). Note that the linear brush moving cylinder 49 remains retracted to its retract limit.

  After that, the rotary brush 42 and the linear brush 48 are selectively used according to the type of foreign matter (attached foreign matter) to be bitten into the roll 11 from the state where it is located at the preparation position shown in FIG.

  That is, when the steel material passing through the roll 11 has a large amount of fine powder as foreign matter to be caught in the roll 11, for example, a high-tensile steel material having a Si content of 0.3 mass% or more, As shown in FIG. 11, the rotating brush 42 moving cylinder 44 is stretched and the rotating brush 42 is pressed against the surface of the roll 11 to brush the surface of the roll 11 (scraping). I do.

  On the other hand, when the steel material that passes through the roll 11 has many relatively large scale pieces that have peeled off as foreign matter that bite into the roll 11, for example, a high-tensile steel material having an Si content of less than 0.3 mass%. As shown in FIG. 12, the linear brush moving cylinder 49 is extended and the linear brush 48 is pressed against the surface of the roll 11 to wipe the surface of the roll 11 as shown in FIG. I do.

  In addition, when there are a large amount of fine powder and a relatively large scale piece separated as foreign matter to be caught in the roll 11, or when there are a lot of sticky oils and fats, the rotating brush 42 and the linear brush 48 As shown in FIG. 13, the rotating brush portion moving cylinder 44 is stretched and the rotating brush 42 is pressed against the surface of the roll 11, and then the linear brush moving cylinder 49 is stretched to linearly move. The brush 48 is pressed against the surface of the roll 11. Thus, the surface of the roll 11 is brushed with the rotating brush 42 and the surface of the roll 11 is wiped with the linear brush 48.

  In this manner, in the third embodiment, the surface of the roll 11 can be accurately cleaned while reducing the size and weight of the apparatus.

  In the above first to third embodiments, the rotating brush is disposed above and the linear brush is disposed below. However, in some cases, the linear brush is disposed above and the rotating brush is disposed below. You may do it.

  Moreover, in said Embodiment 2, 3, although the linear brush part is attached to a rotating brush part, you may make it attach a rotating brush part to a linear brush part depending on the case.

  And in said Embodiment 1-3, the case where it applies to the upper work roll of a skin pass mill is made into the example, However, It can apply similarly to another roll.

DESCRIPTION OF SYMBOLS 10 Skin pass mill 11 Upper work roll 12 Upper backup roll 13 Lower work roll 14 Lower backup roll 18 Rotating brush 19 Linear brush 20 Brush device 21 Rotating brush part 22 Rotating brush 23 Rotating brush moving cylinder 27 Linear brush part 28 Linear brush 29 Linear Brush moving cylinder 30 Brush device 31 Rotating brush portion 32 Rotating brush 33 Holding member 34 Rotating brush portion moving cylinder 35 Overall moving cylinder 37 Linear brush portion 38 Linear brush 39 Linear brush moving cylinder 40 Brush device 41 Rotating brush portion 42 Rotating brush 43 Holding member 44 Rotating brush part moving cylinder 45 Stopper part 45a Stopper 45b Stopper moving cylinder 46 Stopper receiving member 46a Stopper receiver (stopper receiving part) The tip of the)
47 Linear brush part 48 Linear brush 49 Linear brush moving cylinder

Claims (3)

A brush method for beautifying the surface of a roll using a brush device comprising both a rotating brush and a linear brush, and depending on the type of foreign matter adhering to the surface of the roll, the rotating brush and the When the steel material passing through the roll is a high-tensile steel material having a Si content of 0.3% by mass or more, the rotating brush is used, and the steel material passing through the roll has a Si content of 0. In the case of a high-tensile steel material of less than 3% by mass, the above-mentioned linear brush is used . The center of the roll is positioned on the extension line of the direction line in which the rotation center of the rotary brush advances / retreats, and the rotation line of the rotation brush advances in the direction line in which the central portion of the linear brush advances / retreats. The roll brush method according to claim 1, wherein the roll brush method is parallel to the backward direction line. The roll brush method according to claim 2, wherein the distance between the direction line in which the linear brush advances / retreats is separated from the direction line in which the rotation center of the rotary brush advances / retreats is 160 mm or less.

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