JP2024136961A - Side guide device, hot rolling equipment, and side guide cooling method - Google Patents

Abstract

To provide a side guide device, a hot rolling facility, and a side guide cooling method with which abnormality detection can be easily conducted when cooling failure of a side guide occurs.SOLUTION: A side guide device includes a pair of side guides that are arranged on both sides in a width direction of a rolled material being conveyed and subjected to hot rolling. The side guide includes: a side guide body part having a hollow interior; a supply pipe for supplying cooling liquid to the hollow interior; a lower discharge pipe for discharging the cooling liquid from the hollow interior; and a first upper discharge pipe with a first upper discharge port for discharging the cooling liquid from the hollow interior. At normal times, an amount of discharge of the cooling liquid discharged from the lower discharge pipe is adjusted so that the cooling liquid supplied from the supply pipe to the hollow interior of the side guide is discharged through the lower discharge pipe and the first upper discharge port. However, when a first abnormality occurs where an amount of supply of the cooling liquid supplied from the supply pipe is smaller than at the normal times, the cooling liquid is not discharged from the first upper discharge port.SELECTED DRAWING: Figure 3

Description

The present invention relates to a side guide device, a hot rolling facility, and a method for cooling a side guide.

Patent Document 1 discloses a technology in which a pair of side guides are placed on both the upstream and downstream sides of a rolling mill, and the side surfaces of the steel section, which is the material to be rolled that is transported from a heating furnace to the rolling mill and rolled, are held by the pair of side guides to guide the widthwise position of the material to be rolled.

Japanese Patent Application Publication No. 9-52101

In addition to being lightweight, side guides are also required to have strength and rigidity. For this reason, side guides often have a hollow box-shaped cross-section structure. In addition, the side guide positions the shaped steel while sandwiching it, so the contact time between the side guide and the shaped steel is long. The shaped steel is in a high temperature state, for example, at 1000°C or higher, so heat is transferred from the shaped steel to the side guide. For this reason, the side guide is usually cooled from the inside by supplying cooling water to the hollow interior. The cooling water is supplied from the top of the side guide by a hose or pipe, and is discharged from a drainage pipe connected to the bottom of the side guide. However, if there is an abnormality in the supply of cooling water to the hollow interior of the side guide or an abnormality in the discharge of cooling water from the hollow interior of the side guide, poor cooling of the side guide occurs. If poor cooling of the side guide occurs in this way, for example, there is a risk of seizure occurring between a liner attached to one surface of the main body of the side guide and the main body.

The present invention has been made in consideration of the above problems, and its purpose is to provide a side guide device, hot rolling equipment, and a side guide cooling method that can easily detect abnormalities when poor cooling of the side guide occurs.

In order to solve the above problems and achieve the objectives,
[1] A side guide device according to the present invention is a side guide device including a pair of side guides arranged on both sides in the width direction of a rolled material to be transported and hot rolled, the side guides including a side guide body having a hollow interior, a supply pipe connected to the side guide body so as to communicate with the hollow interior and for supplying a cooling liquid to the hollow interior, a lower discharge pipe connected to an underside of the side guide body so as to communicate with the hollow interior and for discharging the cooling liquid from the hollow interior, and a first upper discharge pipe connected to an upper surface of the side guide body so as to communicate with the hollow interior and having a first upper discharge port for discharging the cooling liquid from the hollow interior, the discharge amount of the cooling liquid discharged from the lower discharge pipe is adjusted so that the cooling liquid supplied from the supply pipe to the hollow interior is discharged from the lower discharge pipe and the first upper discharge port under normal circumstances, and when a first abnormality occurs in which the supply amount of the cooling liquid supplied from the supply pipe is less than under normal circumstances, the cooling liquid is not discharged from the first upper discharge port.

[2] The side guide device according to the present invention is the invention of [1] above, characterized in that the side guide is connected to the upper surface of the side guide body so as to communicate with the hollow interior, and is provided with a second upper discharge pipe having a second upper discharge port for discharging the cooling liquid from the hollow interior, the second upper discharge port is disposed above the first upper discharge port, and the discharge amount of the cooling liquid discharged from the lower discharge pipe is adjusted so that the cooling liquid supplied from the supply pipe to the hollow interior under normal conditions is not discharged from the second upper discharge port, and when a second abnormality occurs in which the discharge amount of the cooling liquid discharged from the lower discharge pipe is less than under normal conditions, the cooling liquid is discharged from the second upper discharge port.

[3] The side guide device according to the present invention is characterized in that, in the invention [1] or [2] above, it has an adjustment valve provided in the lower discharge pipe to adjust the amount of the cooling liquid discharged from the lower discharge pipe.

[4] The side guide device according to the present invention is the invention of [1] above, characterized in that it has a liner provided on the surface of the side guide body portion facing the material to be rolled, and the first upper discharge port is positioned so that the cooling liquid is discharged toward the liner.

[5] The side guide device according to the present invention is characterized in that, in the invention [2] above, it has a liner provided on the surface of the side guide body portion facing the material to be rolled, and at least one of the first upper discharge outlet and the second upper discharge outlet is arranged so that the cooling liquid is discharged toward the liner.

[6] The hot rolling equipment according to the present invention includes a rolling mill for rolling a material to be rolled that is heated in a heating furnace;
and a side guide device according to any one of the above-mentioned inventions [1] to [5], which is provided at least on the upstream side or downstream side of the rolling mill in the transport direction of the rolled material from the heating furnace to the rolling mill.

[7] The cooling method for a side guide according to the present invention is a cooling method for a pair of side guides arranged on both sides in the width direction of a material to be rolled, which is transported from a heating furnace to a rolling mill and rolled, and the side guides are provided with a side guide body having a hollow interior, a supply pipe connected to the side guide body so as to communicate with the hollow interior and for supplying a cooling liquid to the hollow interior, a lower discharge pipe connected to the lower surface of the side guide body so as to communicate with the hollow interior and for discharging the cooling liquid from the hollow interior, and a first upper discharge pipe connected to the upper surface of the side guide body so as to communicate with the hollow interior and having a first upper discharge port for discharging the cooling liquid from the hollow interior, and the discharge amount of the cooling liquid discharged from the lower discharge pipe is adjusted so that the cooling liquid supplied from the supply pipe to the hollow interior is discharged from the lower discharge pipe and the first upper discharge port under normal circumstances, and when a first abnormality occurs in which the supply amount of the cooling liquid supplied from the supply pipe is less than under normal circumstances, the cooling liquid is not discharged from the first upper discharge port.

[8] The cooling method for a side guide according to the present invention is the invention of [7] above, characterized in that the side guide is connected to the upper surface of the side guide body so as to communicate with the hollow interior, and is provided with a second upper discharge pipe having a second upper discharge port for discharging the cooling liquid from the hollow interior, the second upper discharge port being located above the first upper discharge port, and the discharge amount of the cooling liquid discharged from the lower discharge pipe is adjusted so that the cooling liquid supplied from the supply pipe to the hollow interior under normal conditions is not discharged from the second upper discharge port, and when a second abnormality occurs in which the discharge amount of the cooling liquid discharged from the lower discharge pipe is less than under normal conditions, the cooling liquid is discharged from the second upper discharge port.

[9] The cooling method for a side guide according to the present invention is characterized in that, in the invention of [7] or [8] above, the discharge amount of the cooling liquid discharged from the lower discharge pipe is adjusted by an adjustment valve provided in the lower discharge pipe connected to the underside of the side guide main body so as to communicate with the hollow interior.

[10] The cooling method for a side guide according to the present invention is the invention described above in [7], characterized in that the cooling liquid is discharged from the first upper discharge port toward a liner provided on the surface of the side guide body facing the rolled material.

[11] The cooling method for a side guide according to the present invention is characterized in that, in the invention [8] above, the cooling liquid is discharged from at least one of the first upper discharge port and the second upper discharge port toward a liner provided on the surface of the side guide body that faces the rolled material.

The side guide device, hot rolling equipment, and side guide cooling method according to the present invention have the advantage of being able to easily detect abnormalities when poor cooling of the side guide occurs.

FIG. 1 is a diagram partially illustrating a schematic configuration of a section steel rolling line according to an embodiment. FIG. 2 is a diagram partially illustrating the equipment configuration of the hot rolling equipment according to the embodiment. FIG. 3 is a cross-sectional view of a side guide according to the embodiment. FIG. 4 is a cross-sectional view of a side guide of a comparative example. FIG. 5 is a diagram showing a cooling problem in the side guide of the comparative example. FIG. 6 is a cross-sectional view of the side guide when the second abnormality occurs. FIG. 7 is a cross-sectional view of the side guide during removal of a jam.

The following describes embodiments of the side guide device, hot rolling equipment, and side guide cooling method according to the present invention. Note that the present invention is not limited to these embodiments.

Figure 1 is a diagram showing a partial schematic configuration of a steel section rolling line 100 according to an embodiment.

The shaped steel rolling line 100 according to the embodiment is a manufacturing facility for shaped steel, and includes, in order from the upstream side to the downstream side of the conveyor table 6, a heating furnace 1, a roughing mill 3, an intermediate rolling mill (not shown), a finishing rolling mill (not shown), and a hot saw (not shown). The material to be rolled 2, such as a slab, heated to a predetermined temperature (e.g., 1200°C to 1300°C) in the heating furnace 1 is hot-rolled using multiple grooves in the order of the roughing mill 3, the intermediate rolling mill, and the finishing rolling mill. The material to be rolled 2 refers to, for example, the steel material to be rolled when manufacturing shaped steel.

The conveying table 6 is provided with multiple conveying rollers arranged along the conveying direction, and the multiple conveying rollers support the rolled material 2 from below, allowing the rolled material 2 to be conveyed in the longitudinal direction.

The rough rolling mill 3 shapes the material 2 to be rolled, which has been heated in the heating furnace 1, by groove rolling so as to approximate the target cross-sectional shape. The rough rolling mill 3 is equipped with upper and lower rolls on which one or more grooves, also called calibers, are engraved along the roll axial direction, and the material 2 to be rolled is rolled multiple times with the grooves.

In addition, in the shaped steel rolling line 100, a pair of entrance side side guides 4A and a pair of exit side side guides 4B are arranged on the entrance side (upstream side in the conveying direction) and the exit side (downstream side in the conveying direction) of the rough rolling mill 3 in the conveying direction of the rolled material 2 from the heating furnace 1 to the rough rolling mill 3. The pair of entrance side side guides 4A are arranged on both sides of the width direction of the rolled material 2 placed on the conveying table 6 and conveyed, and are arranged opposite each other with the rolled material 2 in between. The pair of exit side side guides 4B are arranged on both sides of the width direction of the rolled material 2 placed on the conveying table 6 and conveyed, and are arranged opposite each other with the rolled material 2 in between. The pair of entrance side side guides 4A and the pair of exit side side guides 4B are arranged so that their positions can be changed in the width direction perpendicular to the conveying direction of the rolled material 2. In the following description, unless otherwise specified, the "width direction" refers to the width direction perpendicular to the conveying direction of the rolled material 2.

The widthwise positions of the pair of entrance side guides 4A and the pair of exit side guides 4B are changed according to the type and size of the material 2 being rolled being transported by the transport table 6, and the material 2 is rolled by being guided by the entrance side guide 4A and the pair of exit side guides 4B so that the widthwise position of the material 2 matches one of the grooves. In the following description, when there is no particular distinction between the pair of entrance side guides 4A and the pair of exit side guides 4B, they are also simply referred to as side guides 4.

Figure 2 is a diagram showing a partial configuration of the hot rolling equipment 120 according to the embodiment.

In the shaped steel rolling line 100 according to the embodiment, the entrance side guide device 110A is configured with at least a pair of entrance side guides 4A and an entrance side position adjustment mechanism 5A. In the shaped steel rolling line 100 according to the embodiment, the exit side guide device 110B is configured with at least a pair of exit side guides 4B and an exit side position adjustment mechanism 5B.

The entrance side position adjustment mechanism 5A and the exit side position adjustment mechanism 5B adjust the widthwise positions of the pair of entrance side side guides 4A and the pair of exit side side guides 4B, respectively. The entrance side position adjustment mechanism 5A and the exit side position adjustment mechanism 5B include drive motors 51A, 51B, speed reduction mechanisms 52A, 52B, multiple pinion gears 53A, 53B, and multiple rack gears 54A, 54B. The speed reduction mechanisms 52A, 52B are connected to the rotating shafts of the drive motors 51A, 51B. The output shafts of the speed reduction mechanisms 52A, 52B are connected to multiple pinion gears 53A, 53B. The multiple pinion gears 53A, 53B are meshed with multiple rack gears 54A, 54B, respectively. The pair of entrance side side guides 4A and the pair of exit side side guides 4B are fixed to the multiple rack gears 54A, 54B, respectively. The drive motors 51A, 51B are connected to a motor control device (not shown). This motor control device controls the drive of the drive motors 51A, 51B by signals from an operating device (not shown), and moves the rack gears 54A, 54B in the width direction. The pair of entrance side guides 4A and the pair of exit side guides 4B move in the width direction in conjunction with the movement of the rack gears 54A, 54B, and the positions in the width direction are adjusted.

In the steel rolling line 100 according to the embodiment, at least the roughing mill 3, the inlet side guide device 110A, and the outlet side guide device 110B constitute a hot rolling facility 120 for rolling the rolled material 2 heated in the heating furnace 1. In the inlet side guide device 110A and the outlet side guide device 110B, the pair of inlet side guides 4A and the pair of outlet side guides 4B have a hollow box-shaped cross-sectional structure, and a plurality of hollow interiors 40A, 40B separated by a plurality of partitions are formed. In addition, the pair of inlet side guides 4A and the pair of outlet side guides 4B are provided with supply pipes 42A, 42B, first upper discharge pipes 45A, 45B, second upper discharge pipes 46A, 46B, and a lower discharge pipe described later, corresponding to the plurality of hollow interiors 40A, 40B. The cooling water discharged from the first upper discharge pipes 45A and 45B, the second upper discharge pipes 46A and 46B, and the lower discharge pipe is collected, for example, in a drainage ditch (not shown) provided below the conveyor table 6 and flows into a drainage facility (not shown).

Figure 3 is a cross-sectional view of the side guide 4 according to the embodiment. Note that Figure 3 is a cross-sectional view taken along line A-A in Figure 2.

The side guide 4 has a side guide body 41 and a liner 47. The side guide body 41 is configured with a hollow box-shaped cross-sectional structure so as to form a hollow interior 40 surrounded by an upper wall 41a, a lower wall 41b, an inner wall 41c, and an outer wall 41d. The upper wall 41a forms the upper wall in the height direction of the side guide body 41. The lower wall 41b is the lower wall in the height direction of the side guide body 41. The inner wall 41c forms the inner wall facing the rolled material 2 in the width direction of the side guide body 41. The outer wall 41d forms the outer wall not facing the rolled material 2 in the width direction of the side guide body 41. The side guide body 41 has a hollow box-shaped cross-sectional structure, which increases the strength and rigidity while reducing the weight. A liner 47 that slides against the rolled material 2 is attached to the surface of the inner wall 41c of the side guide body 41 that faces the rolled material 2 by fastening it with a fastening member such as a bolt.

A supply pipe 42 for supplying cooling water, which is a cooling liquid, to the hollow interior 40 of the side guide body 41 is connected to the upper surface of the upper wall 41a so as to communicate with the hollow interior 40. In this embodiment, the supply pipe 42 is connected to the upper wall 41a of the side guide body 41, but the connection position of the supply pipe 42 to the side guide body 41 is not limited to the upper wall 41a. A lower discharge pipe 43 for discharging cooling water from the hollow interior 40 of the side guide body 41 is connected to the lower surface of the lower wall 41b so as to communicate with the hollow interior 40. In addition, the lower discharge pipe 43 is provided with an adjustment valve 44 for adjusting the discharge amount of cooling water discharged from the lower discharge pipe 43. The adjustment valve 44 can adjust the discharge amount of cooling water from the lower discharge pipe 43 by changing the opening degree.

In addition, the upper surface of the upper wall portion 41a is connected to a first upper discharge pipe 45 and a second upper discharge pipe 46, which are a plurality of upper discharge pipes for discharging cooling water from the hollow interior 40 of the side guide main body portion 41. The first upper discharge pipe 45 and the second upper discharge pipe 46 have a first upper discharge port 451 and a second upper discharge port 461 that are located at different positions in the height direction above the upper wall portion 41a. The second upper discharge port 461 of the second upper discharge pipe 46 is disposed above the first upper discharge port 451 of the first upper discharge pipe 45. In addition, the first upper discharge port 451 and the second upper discharge port 461 are disposed so that the cooling water is discharged toward the liner 47. The liner 47 is cooled by the cooling water discharged from the first upper discharge port 451 and the second upper discharge port 461. Note that the discharging of the cooling water toward the liner 47 is not limited to both the first upper discharge port 451 and the second upper discharge port 461. That is, at least one of the first upper discharge port 451 and the second upper discharge port 461 may be arranged so that the cooling water is discharged toward the liner 47. In this case, it is preferable to arrange at least the first upper discharge port 451 so that the cooling water is discharged toward the liner 47. In addition, in this embodiment, the first upper discharge port 451 and the second upper discharge port 461 are provided separately in the first upper discharge pipe 45 and the second upper discharge pipe 46, which are different upper discharge pipes, but this is not limited to this. For example, the first upper discharge port 451 and the second upper discharge port 461 may be provided in a single upper discharge pipe so that the second upper discharge port 461 is located above the first upper discharge port 451.

The hollow interior 40 of the side guide body 41 is filled with cooling water supplied from a supply pipe 42. The side guide 4 is cooled from the inside of the side guide body 41 by the cooling water supplied to the hollow interior 40.

The amount of cooling water discharged from the lower discharge pipe 43 is adjusted by the adjustment valve 44 so that it is less than the amount of cooling water supplied from the supply pipe 42 to the hollow interior 40, and the cooling water is discharged from the first upper discharge port 451 and not discharged from the second upper discharge port 461. That is, in the side guide 4 according to the embodiment, under normal circumstances, the cooling water supplied from the supply pipe 42 to the hollow interior 40 is discharged from the lower discharge pipe 43 and the first upper discharge port 451 and not discharged from the second upper discharge port 461. Note that, if the cooling water can be discharged from the lower discharge pipe 43 so as to satisfy the relationship that the cooling water supplied from the supply pipe 42 to the hollow interior 40 is discharged from the lower discharge pipe 43 and the first upper discharge port 451 and not discharged from the second upper discharge port 461 under normal circumstances, the adjustment valve 44 does not need to be provided. For example, the inner diameter of the lower discharge pipe 43 can be set to adjust the amount of cooling water discharged from the lower discharge pipe 43 so that the cooling water supplied from the supply pipe 42 to the hollow interior 40 is discharged from the lower discharge pipe 43 and the first upper discharge port 451, but not from the second upper discharge port 461.

In the side guide 4 according to the embodiment, when a first abnormality occurs (when a supply abnormality occurs) in which the amount of cooling water supplied from the supply pipe 42 is less than normal, cooling water is not discharged from not only the second upper discharge port 461 but also the first upper discharge port 451. As a result, in the side guide 4 according to the embodiment, an operator can easily determine that an abnormality in the supply of cooling water from the supply pipe 42 to the hollow interior 40 has occurred by visually confirming that cooling water is not being discharged from the first upper discharge port 451.

Figure 4 is a cross-sectional view of a side guide 400 of a comparative example.

As shown in FIG. 4, the side guide 400 of the comparative example has a side guide body 401 and a liner 407. The side guide body 401 is configured with a hollow box-shaped cross-sectional structure so that the upper wall 401a, the lower wall 401b, the inner wall 401c, and the outer wall 401d surround the side guide body 401 to form a hollow interior 440. In the side guide 400 of the comparative example, cooling water is sprayed from a supply pipe 402 connected to the upper wall 401a toward the inner surface of the inner wall 401c to which the liner 407 is attached in the hollow interior 440 to cool the side guide 400. The cooling water sprayed from the supply pipe 402 to the inner surface of the inner wall 401c accumulates in the lower part of the hollow interior 440 and is discharged from a lower discharge pipe 403 connected to the lower wall 401b.

Figure 5 shows the cooling problems with the side guide 400 of the comparative example.

In the side guide 400 of the comparative example, when poor water supply occurs due to clogging in the supply pipe 402 or a problem upstream of the supply pipe 402, the side guide body 401 is insufficiently cooled ((1) in FIG. 5). In addition, when the side guide 400 is used for a long period of time, foreign matter 7 such as scale and dirt accumulates at the bottom of the hollow interior 440 or clogs the lower discharge pipe 403, causing abnormal discharge of cooling water from the lower discharge pipe 403 ((2) in FIG. 5). When abnormal discharge of cooling water occurs, high-temperature cooling water that has taken heat from the side guide body 401 tends to accumulate in the hollow interior 440, causing insufficient cooling of the side guide body 401. The temperature rise of the side guide body 401 due to insufficient cooling causes the hollow interior 440 to become a high-temperature environment, and corrosion and thinning are likely to occur in the lower wall portion 401b that comes into contact with the cooling water accumulated at the bottom of the hollow interior 440 ((3) in FIG. 5). In addition, seizure is more likely to occur between the inner wall 401c of the side guide body 401 and the liner 407 ((4) in Figure 5).

Seizure between the inner wall portion 401c and the liner 407 can also occur due to the following reasons. For example, if the side guide body portion 401 is not cooled enough, the bolt attaching the liner 407 to the inner wall portion 401c is likely to elongate and deform. If elongation deformation of the bolt occurs, misalignment between the liner 407 and the inner wall portion 401c is likely to occur when the rolled material 2 is guided by the side guide 400, and seizure is likely to occur between the inner wall portion 401c and the liner 407.

In addition, seizure between the inner wall portion 401c and the liner 407 can cause problems such as a shorter replacement cycle for the liner 407 and increased wear on the liner attachment surface of the inner wall portion 401c.

Figure 6 shows a cross section of the side guide 4 when the second abnormality occurs.

In the side guide 4 according to the embodiment, when foreign matter 7 such as scale accumulates in the lower part of the hollow interior 40, the lower discharge pipe 43 and the adjustment valve 44 are clogged with the foreign matter 7, resulting in discharge abnormality. As a result, cooling water is discharged not only from the first upper discharge port 451 but also from the second upper discharge port 461. That is, when a second abnormality occurs (when a discharge abnormality occurs) in which the amount of cooling water discharged from the lower discharge pipe 43 is less than normal, the cooling liquid is discharged at least from the first upper discharge port 451 and the second upper discharge port 461. As a result, in the side guide 4 according to the embodiment, by visually confirming that cooling water is being discharged from the second upper discharge port 461, the operator can easily determine that a discharge abnormality of cooling water has occurred in the lower discharge pipe 43 or the adjustment valve 44. In addition, the operator can easily determine the accumulation status of foreign matter 7 such as scale in the hollow interior 40 during daily inspection or operation.

Figure 7 shows a cross section of the side guide 4 when removing a jam.

In the side guide 4 according to the embodiment, when it is confirmed that cooling water is being discharged from the second upper discharge port 461, for example, the adjustment valve 44 provided on the lower discharge pipe 43 is fully opened, and cooling water is supplied from the supply pipe 42 to the hollow interior 40 at a higher pressure than normal. Note that the water pressure (original pressure) of the cooling water under normal conditions is, for example, 3 atmospheres, and when removing a blockage (when a first abnormality occurs), the water pressure (original pressure) is set to a value higher than 3 atmospheres. This makes it possible to blow away and remove foreign matter 7 such as scale that is clogged in the lower discharge pipe 43 and the adjustment valve 44 by blowing with high-pressure cooling water.

As described above, in the side guide device, hot rolling equipment, and side guide cooling method according to the embodiment, it is possible to easily check for abnormalities in the supply and discharge of cooling water at the side guide. As a result, the side guide device, hot rolling equipment, and side guide cooling method according to the embodiment can easily detect abnormalities when poor cooling of the side guide occurs. Note that in this embodiment, a side guide used in a rough rolling mill for shaped steel has been described as an example, but the present invention is not limited to this, and the present invention can be applied to any side guide used in a rolling mill that rolls hot metal material.

1 heating furnace 2 material to be rolled 3 rough rolling mill 4, 400 side guide 4A inlet side side guide 4B outlet side side guide 5A inlet side position adjustment mechanism 5B outlet side position adjustment mechanism 6 conveyor table 7 foreign object 40, 440 hollow interior 41, 401 side guide body 41a, 401a upper wall 41b, 401b lower wall 41c, 401c inner wall 41d, 401d outer wall 42, 402 supply pipe 43, 403 lower discharge pipe 44 adjustment valve 45 first upper discharge pipe 46 second upper discharge pipe 47, 407 liner 100 shaped steel rolling line 110A inlet side guide device 110B outlet side side guide device 120 hot rolling equipment 451 first upper discharge outlet 461 second upper discharge outlet

Claims (11)

A side guide device including a pair of side guides arranged on both sides in the width direction of a rolled material to be transported and hot rolled,
The side guide is
A side guide body having a hollow interior;
a supply pipe connected to the side guide body so as to communicate with the hollow interior, for supplying a cooling liquid to the hollow interior;
a lower discharge pipe connected to a lower surface of the side guide body so as to communicate with the hollow interior, for discharging the cooling liquid from the hollow interior;
a first upper discharge pipe connected to an upper surface of the side guide body portion so as to communicate with the hollow interior, the first upper discharge pipe having a first upper discharge port for discharging the cooling liquid from the hollow interior;
Equipped with
an amount of the cooling liquid discharged from the lower discharge pipe is adjusted so that the cooling liquid supplied from the supply pipe to the hollow interior is normally discharged from the lower discharge pipe and the first upper discharge port;
When a first abnormality occurs in which the amount of the cooling liquid supplied from the supply pipe is less than that in the normal state, the cooling liquid is not discharged from the first upper discharge port.
A side guide device characterized by being configured as above. the side guide includes a second upper discharge pipe connected to an upper surface of the side guide body portion so as to communicate with the hollow interior, the second upper discharge pipe having a second upper discharge port for discharging the cooling liquid from the hollow interior;
The second upper exhaust port is disposed above the first upper exhaust port,
an amount of the cooling liquid discharged from the lower discharge pipe is adjusted so that the cooling liquid supplied from the supply pipe to the hollow interior is not discharged from the second upper discharge port under normal circumstances;
When a second abnormality occurs in which the amount of the cooling liquid discharged from the lower discharge pipe is less than that in the normal state, the cooling liquid is discharged from the second upper discharge port.
2. The side guide device according to claim 1, wherein the side guide device is configured as follows. The side guide device according to claim 1 or 2, characterized in that it has an adjustment valve provided in the lower discharge pipe to adjust the amount of the cooling liquid discharged from the lower discharge pipe. A liner is provided on a surface of the side guide body portion facing the material to be rolled,
The side guide device according to claim 1 , wherein the first upper outlet is disposed so that the cooling liquid is discharged toward the liner. A liner is provided on a surface of the side guide body portion facing the material to be rolled,
The side guide device according to claim 2 , wherein at least one of the first upper discharge port and the second upper discharge port is arranged so that the cooling liquid is discharged toward the liner. A rolling mill that rolls the material to be rolled that has been heated in the heating furnace;
a side guide device according to claim 1, 2, 4 or 5, which is provided on at least one of the upstream side and the downstream side of the rolling mill in a conveying direction of the rolled material from the heating furnace to the rolling mill;
A hot rolling facility comprising: A method for cooling a pair of side guides arranged on both sides in a width direction of a rolled material that is transported from a heating furnace to a rolling mill and rolled, comprising the steps of:
The side guide is
A side guide body having a hollow interior;
a supply pipe connected to the side guide body so as to communicate with the hollow interior, for supplying a cooling liquid to the hollow interior;
a lower discharge pipe connected to a lower surface of the side guide body so as to communicate with the hollow interior, for discharging the cooling liquid from the hollow interior;
a first upper discharge pipe connected to an upper surface of the side guide body portion so as to communicate with the hollow interior, the first upper discharge pipe having a first upper discharge port for discharging the cooling liquid from the hollow interior;
Equipped with
adjusting a discharge amount of the cooling liquid discharged from the lower discharge pipe so that the cooling liquid supplied from the supply pipe to the hollow interior is discharged from the lower discharge pipe and the first upper discharge port under normal conditions;
A method for cooling a side guide, characterized in that when a first abnormality occurs in which the amount of cooling liquid supplied from the supply pipe is less than under normal circumstances, the cooling liquid is not discharged from the first upper discharge port. the side guide includes a second upper discharge pipe connected to an upper surface of the side guide body portion so as to communicate with the hollow interior, the second upper discharge pipe having a second upper discharge port for discharging the cooling liquid from the hollow interior;
The second upper exhaust port is disposed above the first upper exhaust port,
adjusting a discharge amount of the cooling liquid discharged from the lower discharge pipe so that the cooling liquid supplied from the supply pipe to the hollow interior is not discharged from the second upper discharge port under normal conditions;
When a second abnormality occurs in which the amount of the cooling liquid discharged from the lower discharge pipe is less than that in the normal state, the cooling liquid is discharged from the second upper discharge port.
8. The method for cooling a side guide according to claim 7, characterized in that: The discharge amount of the cooling liquid discharged from the lower discharge pipe is
9. The cooling method for a side guide according to claim 7 or 8, characterized in that the cooling is adjusted by an adjustment valve provided in a lower exhaust pipe connected to the underside of the side guide body so as to communicate with the hollow interior. The cooling method for a side guide according to claim 7, characterized in that the cooling liquid is discharged from the first upper discharge port toward a liner provided on the surface of the side guide body facing the rolled material. The cooling method for a side guide according to claim 8, characterized in that the cooling liquid is discharged from at least one of the first upper discharge port and the second upper discharge port toward a liner provided on the surface of the side guide body facing the rolled material.

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