JP3314705B2 - Hot strip cooling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot strip such as a running steel strip in a hot rolling facility.
TECHNICAL FIELD The present invention relates to a cooling device for uniformly dispersing and dropping water into water and improving cooling ability or plate passing property.

[0002]

2. Description of the Related Art Various types of cooling devices have been developed for cooling hot strips. A typical example is a cooling device for a run-out table of a hot rolling mill. Here, the cooling device used to cool the upper surface of the hot strip has a high cooling capacity,
The laminar flow method is used because it is difficult to cause nozzle clogging. The nozzle used when this laminar flow method is a rod shape is a pipe shape, rectifies the cooling water supplied from the cooling header into a plurality of laminar flows, and drops it on the surface of the hot strip to achieve high cooling capacity. It has gained.

[0003] However, the laminar flow method has a high cooling capacity, but it is difficult to adjust the cooling capacity in a narrower range than other cooling methods, for example, a spray cooling method. It is because when the water volume is reduced, the cooling capacity at the location away from the laminar fall point decreases, but the cooling capacity remains high immediately below the laminar flow, so different parts of the cooling rate in the width direction of the hot strip occur, This may cause unevenness in the material in the width direction. The following technology has been proposed as a measure for preventing the non-uniformity of the cooling capacity generated when the cooling water amount is reduced in this way.

[0004] In the technology described in Japanese Patent Publication No. 53-85708 (prior art), laminar flow cooling water is once received in a large saucer-shaped container (shower tank), and the hot strip is formed from a large number of watering holes provided on the bottom. Watering. An attempt is made to obtain a cooling water spray amount suitable for a thin object by the hole diameter and pitch of the water spray holes.

[0005] The technique described in Japanese Patent Publication No. 63-50087 (prior art) is to disperse laminar flow cooling water with a permeation type water dispersion plate and spray water on a hot strip. In this technique, a relatively large mesh plate is used in order to prevent the water dispersion plate from being clogged by scale or the like. In addition, the mesh plates are used in a plural number as required, and are arranged so as to be shifted from each other, thereby reducing the substantial mesh size.

[0006] The technique described in Japanese Patent Application Laid-Open No. 6-179012 (prior art) is to disperse laminar flow cooling water with a water flow guide plate and a permeation type water dispersion plate to spray water on a hot strip. In this technique, the cooling water is made uniform in the width direction of the hot strip by the water flow guide plate. Thereafter, water is sprinkled on the water dispersion plate, and the water is poured into the hot strip, so that uniform slow cooling can be achieved.

[0007]

In the prior art, a uniform slow cooling state can be easily obtained by storing the cooling water. However, since the cooling water is temporarily stored in a tank (shower tank), the cooling water is temporarily stored. However, there is a problem in that a robust container is required, a robust base for supporting the container is required, and the equipment becomes large.

In the prior art, laminar flow cooling water is dispersed by a permeation type water dispersion plate. However, since water is dropped directly on the water dispersion plate, the water density is partially increased, and the dispersibility is lowered. However, there was a problem that uniform dispersion was not obtained, uniform cooling could not be achieved, the dropping range was narrow, the water dispersion plate was not used effectively, and the cooling relaxation effect was not sufficient.

[0009] The prior art, compared to the prior art,
Since the laminar flow cooling water is made uniform in the width direction of the hot strip by the water flow guide plate and then dispersed by the water dispersion plate, uniform slow cooling becomes possible. However, as in the prior art, there was a problem that the water density at the portion where the cooling water was dropped onto the water dispersion plate by the water flow guide plate was increased, and uniform cooling could not be achieved.

[0010] In addition, there is also a problem in that the above-mentioned prior arts 1 to 5 are required to be installed in conventional facilities, so that the facilities become large-scale.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and performs uniform cooling by slow cooling, and furthermore, alleviates the impact force on the hot strip to increase the traveling speed of the hot strip. It is an object of the present invention to provide a hot strip cooling device capable of improving the sheet passing property by eliminating the material unevenness due to cooling.

[0012]

SUMMARY OF THE INVENTION A hot strip cooling apparatus according to the present invention has a number of uniform holes at the bottom below a laminar nozzle installed above a hot strip, and extends in the width direction of the hot strip. A rectangular box-shaped water-dispersion tray is installed, and a water-receptor for repelling water is provided at a collision position of water dropped from a laminar nozzle of the water-dispersion tray.

The water receiving portion is a flat plate or an angle plate having a mountain-shaped cross section attached to the bottom of the water dispersing tray or a holeless portion at the bottom of the water dispersing tray.

The flat plate or the angle plate is rotatably mounted at the bottom of the water dispersion tray at a collision position with water.

The flat plate or the angle plate is mounted at the bottom of the water dispersion tray so as to be able to freely enter and exit the collision position of water.

In the present invention, a rectangular box-shaped water dispersion tray having a large number of uniform holes at the bottom below the laminar nozzle installed above the hot strip and extending in the width direction of the hot strip is installed. Since the water dispersion unit is provided with a water receiving unit that repels water at a collision position of water dripping from the laminar nozzle of the water dispersion tray, the cooling water dripping from the laminar nozzle is disposed at the bottom of the water dispersion tray. It collides with the provided water receiving portion and scatters and spreads around, and a part thereof is uniformly dropped on the upper surface of the hot strip from a number of uniform holes around the water receiving portion of the water dispersion tray, and the rest is. Because the water accumulates at the bottom of the water dispersion plate and the accumulated water drops uniformly on the top of the hot strip from a number of uniform holes on the entire bottom, uniform cooling by slow cooling is performed, and there is a water receiving part. Hot street Impact force to the flop also can increase the speed of the hot strip by being alleviated, also eliminates the material unevenness of the cooling, the sheet passing property is improved.

Further, since the water receiving portion is merely provided at the collision position of the water dripping from the laminar nozzle at the bottom of the water dispersion tray, the structure is simple and inexpensive, and can be attached to the conventional equipment. . Furthermore, since the cooling water dripping from the laminar nozzle accumulates at the bottom of the water dispersion tray and drops uniformly on the top surface of the hot strip from a number of uniform holes, the nozzle of the header may be partially clogged. Even if it occurs, it can always be cooled.

Further, since the water receiving portion is a flat plate attached to the bottom of the water dispersion tray or an angle plate having a mountain-shaped cross section or a holeless portion at the bottom of the water distribution plate, the structure is very simple and inexpensive. It can be attached.

Further, since the flat plate or the angle plate is attached to the bottom of the water dispersion tray so as to be pivotable at the collision position of water or to be able to enter and exit the collision position of water, the flat plate or the angle plate drops. When it is in the water collision position, the cooling water dripping from the laminar nozzle collides with the water receiving part and scatters around, spreads, accumulates in the water dispersion tray, and then from many uniform holes to the top surface of the hot strip. Cooling is performed uniformly in the slow cooling mode for uniform dropping, and when the flat plate or angle plate is at a position other than the collision position of the dripping water, the cooling water dripping from the laminar nozzle is laminar flow. As a result, cooling is performed in the strong cooling mode to directly hit the water dispersion tray and hit the upper surface of the hot strip from the hole with strong collision pressure. You can use both slow cooling mode and a strong cooling mode by cheating.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a front view showing a hot strip cooling device according to Embodiment 1 of the present invention, and FIG. 2 is a plan view showing the hot strip cooling device.
In the figure, 1 is a cooling header, 2 is a laminar nozzle to which cooling water is supplied from the cooling header 1, 3 is a rectangular box-shaped water dispersion tray installed below the laminar nozzle 2, 4 is a water dispersion tray 3 A running hot strip 5 located below is a runout roller for running the hot strip 4. The water-dispersion tray 3 extends in the width direction of the hot strip 4 and has a large number of uniform holes 3 at its bottom.
a. Laminar nozzle 2 of the water dispersion tray 3
A flat plate 10 which is a water receiving portion for repelling water is provided at a collision position of more dropped water.

The water dispersion tray 3 is mounted close to the laminar nozzle 2 in order to reduce the collision force of water colliding with the flat plate 10 and to prevent the water from scattering. It is desirable to increase the width of 3. It should be noted that since a space is generally provided immediately below the laminar nozzle 2, the water dispersion tray 3 can be easily installed. Also, if the hole 3a at the bottom of the water dispersion tray 3 is too large, it will drip before water pools in the water dispersion tray 3, and if it is too small, drainage will be poor and turbulence will occur, resulting in non-uniform dispersion. It is necessary to set a proper diameter.

Further, if the thickness of the bottom of the water dispersion tray 3 is too small in relation to the holes 3a, the drainage becomes poor and turbulence occurs, and the dispersion becomes uneven. Therefore, the thickness should be equal to or larger than the diameter of the holes. In addition, it is desirable that the width of the flat plate 10 is equal to or slightly larger than the spread of the water dropped in consideration of the spread of the water dropped from the laminar nozzle 2. In the first embodiment,
In consideration of the above, the diameter of the laminar nozzle 2 is 20 mm
In this case, the width of the flat plate 10 was 25 mm, the diameter of the hole 3 at the bottom of the water dispersion tray 3 was 6 mm, the pitch between adjacent holes 3 was 20 mm, and the aperture ratio was 14.1.

Next, the operation of the hot strip cooling device according to the first embodiment of the present invention will be described. The cooling water dropped from the laminar nozzle 2 collides with a flat plate 10 serving as a water receiving portion provided at the bottom of the water dispersion tray 3 and scatters and spreads around. Is uniformly dropped on the upper surface of the hot strip 4 traveling from the large number of uniform holes 3a around the bottom, and the remainder is collected at the bottom of the water dispersion tray 3, and the collected water is hot through the large number of uniform holes 3a of the entire bottom. Since the droplets are uniformly dropped on the upper surface of the strip 4, uniform cooling by slow cooling is performed, and the collision force against the hot strip 4 is also reduced due to the presence of the flat plate 10 as a water receiving portion. The running speed can be increased, the material unevenness due to cooling is eliminated, and the sheet passing property is improved.

Further, since the flat plate 10 as the water receiving portion is merely provided at the collision position of the water dripping from the laminar nozzle 2 at the bottom of the water dispersion receiving tray 3, the structure is simple and inexpensive, and the conventional equipment can be used. It can be attached. Further, the cooling water dropped from the laminar nozzle 2 is supplied to the water dispersion tray 3.
After being collected at the bottom of the hot strip 4 from the uniform holes 3a, the cooling header 1
Even if a part of the laminar nozzle 2 becomes clogged, cooling is always possible.

In the first embodiment, the laminar nozzle 2
Is 20 mm, the width of the flat plate 10 is 25 mm,
The diameter of the hole 3 at the bottom of the water dispersion tray 3 was 6 mm, the pitch of the adjacent holes 3 was 20 mm, and the aperture ratio was 14.1. This is because a complete dispersion effect was observed when the diameter of the hole 3 at the bottom of the water dispersion tray 3 was 6 mm. However, the diameter of the hole 3 may be 8 mm or 10 mm, and in this case, the aperture ratio may be reduced. If changed, a complete diversification effect was observed.

FIG. 3 shows the first hot strip cooling apparatus.
(A) is a front view, and (b) is a partially omitted plan view. In a first modification of the hot strip cooling device, a flat plate 10 is lifted by a leg 11 at a water receiving portion provided at the bottom of the water dispersion tray 3. The flat plate 10 floated by the legs 11 is closer to the laminar nozzle 2, and the impact force of the cooling water dripping from the laminar nozzle 2 is weaker than that of the flat plate 10 alone. The width of the pan 3 can be reduced. Except for the above, the operation and effect are the same as those of the flat plate 10.

FIG. 4 shows a second embodiment of the hot strip cooling apparatus.
(A) is a front view, and (b) is a partially omitted plan view. In a second modification of the hot strip cooling device, a water receiving portion provided at the bottom of the water dispersion tray 3 is replaced with an angle plate 20 having a mountain-shaped cross section instead of the flat plate 10.
It is what it was. The cooling water dripping from the laminar nozzle 2 spreads more easily in the angle plate 20 than in the flat plate 10. Except for the above, the operation and effect are the same as those of the flat plate 10.

FIG. 5 shows a third embodiment of the hot strip cooling apparatus.
(A) is a front view, and (b) is a partially omitted plan view. In the second modification of the hot strip cooling device, a water receiving portion provided at the bottom of the water dispersion tray 3 is provided with a holeless portion 30 at the bottom of the water dispersion tray 3 instead of the flat plate 10. The configuration having the holeless portion 30 is simpler than the configuration having the flat plate 10. Except for the above, the operation and effect are the same as those of the flat plate 10.

Embodiment 2 FIG. 6 shows Embodiment 2 of the present invention.
FIG. 2A is a front view, and FIG. 1B is a partially omitted plan view. In the figure, the same components as those of the first embodiment of the present invention are denoted by the same reference numerals, and the description of the duplicated components will be omitted. This embodiment 2
A flat plate 10 serving as a water receiving portion is pivotally supported by a rotating shaft 15 rotatably supported on a side wall of the water dispersion receiving tray 3 and is pivotally attached to the bottom of the water distribution receiving tray 3. 16 is a rotating shaft 15
, 17 is a motor attached to the side wall of the water dispersion tray 3, 18 is provided on the motor 17,
6 is a driving gear meshing with the driving gear 6.

In the second embodiment, if there is no slow cooling in relation to the type of steel or the thick material, that is, if it is desired to use in the strong cooling mode,
The motor 17 is driven to rotate the rotary shaft 15, and the flat plate 10 supported by the rotary shaft 15 is turned to the position shown by the solid line in FIG. Set to position. Then, the cooling water dripping from the laminar nozzle 2 forms a laminar flow, directly hits the water dispersion tray 3, and hits the upper surface of the hot strip 4 from the hole 3a with a strong collision pressure, so that cooling in the strong cooling mode is performed. Will be

If it is desired to use the cooling mode in the slow cooling mode due to the type of steel or the thickness, the motor 17 is driven to rotate the rotating shaft 1.
5, the flat plate 10 pivotally supported by the rotating shaft 15 is turned to the position shown by the broken line in FIG. Then, the cooling water dripped from the laminar nozzle 2 collides with the flat plate 10 and scatters around, spreads, accumulates in the water dispersion tray 3, and then uniformly drops on the upper surface of the hot strip 4 from the many uniform holes 3 a. Therefore, uniform cooling is performed in the slow cooling mode. Thus, both the slow cooling mode and the strong cooling mode can be used by the same laminar nozzle. In the second embodiment, the case where the water receiving portion is the flat plate 10 has been described, but it goes without saying that the present invention is also applicable to an angle plate.

Embodiment 3 FIG. FIG. 7 shows Embodiment 2 of the present invention.
FIG. 2A is a front view, and FIG. 1B is a partially omitted plan view. In the figure, the same components as those of the first embodiment of the present invention are denoted by the same reference numerals, and the description of the duplicated components will be omitted. This embodiment 3
A flat plate 10 serving as a water receiving portion is connected to a drive shaft 21 which moves forward and backward through the side wall of the water dispersion receiving tray 3 and is attached to the bottom of the water distribution receiving tray 3 so as to be able to freely enter and exit from a collision position of water. An actuator 22 drives the drive shaft 21 forward and backward.

In the third embodiment, if there is no slow cooling in relation to the type of steel or thick material, that is, if it is desired to use in the strong cooling mode,
The actuator 22 is driven to drive the drive shaft 21 to move the flat plate 10 connected to the drive shaft 21 to the position shown by the solid line in FIG. Set to position. Then, the cooling water dripping from the laminar nozzle 2 forms a laminar flow, directly hits the water dispersion tray 3, and hits the upper surface of the hot strip 4 from the hole 3a with a strong collision pressure, so that cooling in the strong cooling mode is performed. Will be

When it is desired to use the slow cooling mode in relation to the type of steel or the thickness of the steel plate, the actuator 22 is driven to retreat the drive shaft 21, and the flat plate 10 connected to the drive shaft 21 is moved by a broken line in FIG. Is moved to the position shown in FIG.
Is set to the collision position of the dripping water. Then,
The cooling water dropped from the laminar nozzle 2 collides with the flat plate 10, scatters and spreads around, and accumulates in the water dispersion tray 3, and is uniformly dropped on the upper surface of the hot strip 4 from the many uniform holes 3 a. In addition, uniform cooling is performed in the slow cooling mode. Thus, both the slow cooling mode and the strong cooling mode can be used by the same laminar nozzle. In the second embodiment, the case where the water receiving portion is the flat plate 10 has been described, but it goes without saying that the present invention is also applicable to an angle plate.

Embodiment 4 FIG. FIG. 8 shows Embodiment 4 of the present invention.
It is a front view which shows the hot strip cooling device of FIG. In the figure, the same components as those of the first embodiment of the present invention are denoted by the same reference numerals, and the description of the duplicated components will be omitted. Embodiment 4
Is provided with two water dispersion trays 3 for dispersing the cooling water of the pair of laminar nozzles 2 for one cooling header 1,
When six cooling headers 1 are installed in one bank, a flat plate 10 as a water receiving portion provided on a total of 12 water dispersion trays 3 is moved in and out at a time. Reference numeral 31 denotes a drive shaft connected to each plate 10, and 32 denotes an actuator for moving each drive shaft 31 forward and backward at a time.

In the fourth embodiment, the actuator 32 can be used in the slow cooling mode or the strong cooling mode.
Is driven, the twelve drive shafts 31 corresponding to the twelve water dispersion trays 3 for one bank are moved forward and backward at a time. In the fourth embodiment, the case where the flat plate 10 as the water receiving portion is moved in and out has been described. However, it is needless to say that the present invention is also applied to the case where the flat plate 10 is turned. It goes without saying that the present invention is also applied to an angle plate.

[0037]

As described above, according to the present invention, a rectangular box extending in the width direction of the hot strip has a large number of uniform holes at the bottom below the laminar nozzle installed above the hot strip. A water-dispersion tray is installed, and a water-repelling part is provided for repelling water at the collision position of water that drops from the laminar nozzle of the water-dispersion tray. Collides with the water receiving part provided at the bottom of the water dispersion tray and scatters around and spreads,
A part of the water drops is uniformly dropped on the top of the hot strip from a number of uniform holes around the water receiving portion of the water dispersion tray, and the rest is collected at the bottom of the water dispersion plate, and the accumulated water is a large number of the entire bottom. A uniform cooling is performed by slow cooling because the droplets are uniformly dropped on the upper surface of the hot strip from the uniform holes, and the collision force against the hot strip is reduced by the presence of the water receiving part. This has the effect of eliminating material unevenness due to cooling and improving the sheet passing property.

Further, since the water receiving portion is merely provided at the collision position of the water dripping from the laminar nozzle at the bottom of the water dispersion receiving tray, the structure is simple and inexpensive, and can be attached to the conventional equipment. It has the effect of. Furthermore, since the cooling water dripping from the laminar nozzle collects at the bottom of the water dispersion tray and drops uniformly on the top surface of the hot strip from a number of uniform holes, the nozzle is often clogged partially in the laminar nozzle of the header. Even if it occurs, there is an effect that cooling is always possible.

Further, since the water receiving portion is a flat plate attached to the bottom of the water dispersion tray or an angle plate having a mountain-shaped cross section or a holeless portion at the bottom of the water distribution plate, the structure is very simple and inexpensive. This has the effect of being attachable.

Further, since the flat plate or the angle plate is attached to the bottom of the water dispersion tray so as to be pivotable at the collision position of water or to enter and exit the collision position of water,
When the flat plate or the angle plate is at the collision position of the dripping water, the cooling water dripping from the laminar nozzle collides with the water receiving part and scatters around, spreads out, and accumulates in the water dispersion tray. In order to uniformly drip from the uniform hole to the upper surface of the hot strip, uniform cooling is performed in the slow cooling mode, and when the flat plate or the angle plate is at a position deviating from the collision position of the dripping water, the laminar nozzle is used. The cooling water that has been dropped becomes a laminar flow, hits the water dispersion tray, and hits the upper surface of the hot strip from the hole with a strong collision pressure, so that the cooling is performed in the strong cooling mode. This has the effect that both of the strong cooling modes can be used.

[Brief description of the drawings]

FIG. 1 is a front view showing a hot strip cooling device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing the hot strip cooling device.

3A and 3B show a first modified example of the hot strip cooling device, wherein FIG. 3A is a front view and FIG. 3B is a partially omitted plan view.

4A and 4B show a second modified example of the hot strip cooling device, wherein FIG. 4A is a front view, and FIG. 4B is a partially omitted plan view.

5A and 5B show a third modification of the hot strip cooling device, wherein FIG. 5A is a front view, and FIG. 5B is a partially omitted plan view.

6A and 6B show a hot strip cooling device according to a second embodiment of the present invention, wherein FIG. 6A is a front view, and FIG. 6B is a partially omitted plan view.

7A and 7B show a hot strip cooling device according to a third embodiment of the present invention, wherein FIG. 7A is a front view, and FIG. 7B is a partially omitted plan view.

FIG. 8 is a front view showing a hot strip cooling device according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling header 2 Laminar nozzle 3 Water dispersion tray 3a hole 4 Hot strip 10 Flat plate (water receiving part)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-85708 (JP, A) JP-A-6-179012 (JP, A) JP-B-63-50087 (JP, B2) (58) Field (Int.Cl. ⁷ , DB name) B21B 45/02 320 C21D 1/00 122 C21D 9/52 102

Claims (4)

(57) [Claims] 1. A hot strip cooling apparatus provided on the outlet side of a hot finishing mill, which cools a running hot strip with cooling water, wherein a large number of hot strip strips are provided below a laminar nozzle installed above the hot strip. With a uniform hole of, and installing a rectangular box-shaped water dispersion tray extending in the width direction of the hot strip,
A hot strip cooling device comprising a water receiving portion for repelling water at a collision position of water dropped from a laminar nozzle at the bottom of the water dispersion tray. 2. The water receiving tray according to claim 1, wherein the water receiving tray is one of a flat plate attached to the bottom of the water distribution tray, an angle plate having a mountain-shaped cross section, and a holeless portion at the bottom of the water distribution tray. A hot strip cooling device as described. 3. The hot strip cooling device according to claim 2, wherein the flat plate or the angle plate is rotatably attached to the water collision position at the bottom of the water dispersion tray. 4. The hot strip cooling apparatus according to claim 2, wherein the flat plate or the angle plate is attached at the bottom of the water dispersion tray plate so as to be able to freely enter and exit the water collision position.