JP2001353515A - Method and device for dewatering high-temperature steel sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drain water which is retained on the upper surface of a steel sheet from the upper surface of the steel sheet. SOLUTION: A water jetting device 13 is arranged on the downstream side of an upper surface cooling device 1 and an air jetting device 14 is arranged on the downstream side of the water jetting device. On the jetting devices 13, 14, four nozzles 21 are respectively arrayed over the width direction of the line. The angle of the nozzle 21 is adjusted so that fluid is jetted toward the upper surface of the steel sheet 2, toward the upper surface cooling device 1 and toward an edge part 2a of the steel sheet 2. The retained water on the upper surface of the steel sheet 2 is discharged from the edge part 2a of the steel sheet 2 by allowing the water to be accompanied with the fluid jetted from the nozzle 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a draining method and apparatus for discharging cooling water staying on a steel sheet to be cooled from the steel sheet by jetting a fluid when the hot-rolled hot steel sheet is cooled with water. It is about.

[0002]

2. Description of the Related Art A hot-rolled high-temperature steel sheet is cooled by a cooling device provided downstream of the finish rolling mill in the direction in which the steel sheet moves, that is, in the line traveling direction. Such a cooling device is composed of an upper surface cooling device for cooling the upper surface of the steel plate and a lower surface cooling device for cooling the lower surface of the steel plate. Each cooling device is composed of a plurality of banks.

As the above-mentioned upper surface cooling device, a laminar system or a spray system is generally employed. And when cooling the upper surface of the steel plate by these cooling devices,
Since the plate surface of the steel plate is in a horizontal state, the cooling water on the upper surface of the steel plate flows out as stagnant water in the moving direction of the steel plate or in the opposite direction.

Since such accumulated water supercools the upper surface of the steel sheet, a temperature difference between the upper surface and the lower surface of the steel plate or a temperature difference between the upper surface and the lower surface occurs. Since the shape difference of the steel sheet occurs due to the temperature difference, an operation of correcting the shape by a press or a straightening machine is required, and the manufacturing cost is increased. In addition, since the cooling stop temperature of the steel sheet varies and the temperature distribution in the width direction of the steel sheet varies, the material of the steel sheet varies, thus deteriorating the quality.

[0005] For these reasons, it is important to drain water so that water remaining on the upper surface of the steel sheet does not enter another bank, and to discharge the water remaining from the upper surface of the steel sheet as soon as possible.

Japanese Patent Publication No. 59-13573 discloses a technique for draining water remaining on the upper surface of a high-temperature steel sheet.
As shown in FIG. 7, a drainer based on this technique is provided with a fluid injection nozzle 3 outside the line on the downstream side of the upper surface cooling device 1, and the cooling water injected from the cooling device 1 onto the upper surface of the high-temperature steel plate 2 is provided on the downstream side. Is cooled by the high-pressure fluid injected from the nozzle 3 toward the upper surface of the steel plate on the downstream side of the upper surface cooling device 1, and the cooling water (retained water) retained on the upper surface of the steel plate is discharged to the side of the steel plate 2. This is to blow off the edge 2a (steel plate edge) out of the line. Arrow 7 in the figure indicates the line traveling direction (the moving direction of the steel plate) (hereinafter referred to as Prior Art 1).

The method disclosed in Japanese Patent Application Laid-Open No. 58-177419 discloses a method of cooling the upper surface of the upper surface cooling device 1 on the downstream side (or upstream side) as shown in FIGS. A fluid ejection device 11 having a plurality of water ejection nozzles at a position close to the device 1 and a fluid ejection device 12 having a plurality of air ejection nozzles at a position farther than the fluid ejection device 11 are provided. From Nos. And 12, the draining fluid is injected from the direction opposite to the direction in which the cooling water flows to dam the cooling water (retained water) that has accumulated on the upper surface of the steel plate (hereinafter referred to as Prior Art 2).

Further, as shown in FIG. 9, on the downstream side of the upper surface cooling device 1, a draining roll 4 contacting the upper surface of the steel plate 2 is provided at a position corresponding to the transport roll 5 with the steel plate 2 interposed therebetween. Cooling water (retained water) retained on the upper surface of the steel sheet by sandwiching the steel sheet 2 between the roll 4 and the transport roll 5
There is also a method of damming and draining water (hereinafter, referred to as “cited reference 3”).

[0009]

However, the above-mentioned prior art has the following problems. (1) Prior art 1 (technique disclosed in Japanese Patent Publication No. 59-13573), for example, when a large amount of retained water flows out, such as when cooling a thick steel plate, or when cooling a hot-rolled steel strip. When the passing speed is high, a collision force and momentum sufficient to overcome the flow of the stagnant water are required for the ejected fluid. For this reason, when draining a steel sheet having a width exceeding 5 m such as a thick steel sheet, or passing a sheet at a high speed even with a maximum width of about 2 m such as a hot-rolled steel strip. When the accumulated water on the steel strip is increasing, the distance between the injection position of the nozzle 3 and the edge 2a of the steel plate 2 on the opposite side is large, so that the drop of the fluid collision pressure is reduced. Inevitable. As a result, the edge 2 of the steel plate 2 on the opposite side that is away from the nozzle 3
In the case of a, discharge of the stagnant water becomes difficult and causes supercooling. (2) Prior art 2 (a technique disclosed in Japanese Patent Application Laid-Open No. 58-177419). In the case where a large amount of stagnant water flows out as in the case of cooling a thick steel plate, or in the case of cooling a hot-rolled steel strip. When the steel strip is transported at a high speed and the accumulated water on the steel strip is accelerated, the draining fluid is required to have a collision force and momentum enough to overcome the flow of the accumulated water. At this time, as shown in FIG. 8, when draining is performed by injecting a fluid from a direction opposite to the line traveling direction in which the retained water leaks, the momentum is equal to or more than the momentum of the retained water. It is necessary to spray a draining fluid with Therefore, in order to increase the momentum of the fluid, it is necessary to increase the injection pressure or increase the flow rate of the drainage fluid, which increases the equipment cost and the operating cost. (3) Prior art 3 (method using a draining roll) If warping or waves occur in the steel sheet before or during cooling, even if the draining roll is pressed against the steel sheet, it is possible to completely press the draining roll onto the upper surface of the steel sheet. A gap is formed between the steel plate and the draining roll, and the retained water leaks from this gap.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to drain water remaining on the upper surface of a steel sheet so as not to enter another bank and discharge the water from the upper surface of the steel sheet. It is an object of the present invention to provide a method and a device for draining a steel sheet.

[0011]

Means for solving the above-mentioned problems are as follows.

[0012] The invention of the draining method according to the first aspect of the present invention is a method for draining water, which is located upstream and / or downstream of the cooling device provided in the line in the line traveling direction and above the steel plate.
Two or more fluid ejecting devices having at least two nozzles are arranged in the line traveling direction, and at least the water from the fluid ejecting device arranged at a position closest to the cooling device, at least a position farthest from the cooling device. The fluid ejecting device is arranged so that air can be ejected, respectively, from the nozzle in the direction of the upper surface of the steel plate and the cooling device side, and in the direction of the lateral edge of the steel plate. And discharges the water remaining on the upper surface of the steel plate from the steel plate together with the fluid injected from the nozzle.

According to a second aspect of the present invention, there is provided a draining device which is located upstream and / or downstream of the cooling device provided in the line in the line traveling direction and above the steel plate.
Two or more fluid ejecting apparatuses having at least two nozzles are arranged in the line traveling direction, and at least the fluid ejecting apparatus arranged at a position closest to the cooling device receives water from the nozzles and at least the cooling device. The fluid ejection device disposed farthest from the nozzle is configured to be able to eject air from the nozzle, respectively, the nozzle is located on the upper surface of the steel plate and the direction of the cooling device side, and the steel plate It is characterized in that it is configured to be able to eject a fluid in the direction of the side edge portion of.

[0014] According to a third aspect of the present invention, there is provided the above-mentioned nozzle, wherein
It is characterized in that the fluid is configured to be able to spread and eject in a fan shape at an angle in the range of 0 to 60 °.

The invention according to claim 4 is characterized in that the nozzle is formed so as to be able to spray toward the cooling device side at an angle of 15 to 75 ° with the line width direction. It is.

According to a fifth aspect of the present invention, the nozzle is formed so as to be able to form an angle of 5 to 80 ° with respect to a vertical direction and to be able to spray toward the cooling device side and the upper surface side of the steel plate. It is characterized by the following.

The invention according to claim 6 is characterized in that a draining roll is provided between the cooling device and the fluid ejecting device capable of ejecting water, the roll being in contact with the upper surface of a steel plate. is there.

The invention according to claim 7 is characterized in that the fluid ejecting apparatus is provided with a guard for preventing the nozzle from contacting the steel plate.

In cooling a high-temperature steel sheet, for example, when a large amount of cooling water is used for cooling a thick steel sheet, or when a steel strip is conveyed at a high speed like a hot run table of a hot-rolled steel strip, the steel sheet stays on the steel strip. When the speed of the water increases, the momentum of the stagnant water coming out of the upper surface cooling device becomes very large. Therefore, in order to overcome the momentum of the stagnant water,
Although a fluid ejecting apparatus capable of ejecting a draining fluid having a large amount of momentum is required, it is not preferable because of the equipment cost and the operating cost as described above.

Therefore, instead of overcoming the momentum of the stagnant water, changing the direction of the motion of the stagnant water makes it possible to discharge the stagnant water with a draining fluid having a small momentum.

Further, the draining fluid ejected from the nozzle of the fluid ejecting apparatus is attenuated as it moves away from the nozzle, and therefore, it is preferable to eject the fluid from a close distance as much as possible. Therefore, a fluid ejecting apparatus having a fluid ejecting nozzle is provided above a steel plate moving on a line so that a draining fluid can be ejected from a short distance from the steel plate. In addition, a plurality of nozzles are arranged in the line width direction to correspond to a wide steel plate, and the accumulated water discharge efficiency is improved.

Further, in order to change the direction of the movement of the accumulated water, the fluid is jetted from each nozzle toward the side edge of the steel plate obliquely with respect to the line traveling direction, so that the drainage jetted from the nozzle is drained. The stagnant water on the upper surface of the steel plate accompanying the fluid can be discharged from the edge. This allows
With a fluid having a relatively small amount of water or a low pressure, the accumulated water can be efficiently drained.

A fluid ejecting apparatus (hereinafter, referred to as "water ejecting apparatus") having two or more fluid ejecting apparatuses disposed in the line traveling direction and having a nozzle for ejecting water at a position close to the upper surface cooling apparatus is provided. A fluid ejection device having a nozzle for ejecting air at a position farther than the device (hereinafter, referred to as an “air ejection device”) is provided. The reason is that if the water is drained only by the water injection device, the steel plate is supercooled by the injected draining fluid (water), so that the temperature of the entire steel plate decreases. Furthermore, if a draining fluid (water + air) in which water and air are mixed is used, water becomes droplets, and it becomes impossible to continuously impart momentum to the retained water.
In this case, since the draining fluid is spread and injected by the air, the area where the draining fluid (water + air) collides with the stagnant water on the steel plate increases, and the collision pressure per unit area decreases. Therefore, the momentum of water and air cannot be efficiently given to the stagnant water on the steel plate. Therefore, the water injection device and the air injection device are separated, and the water injection device is provided at a position near the cooling device, and the air injection device is provided at a position farther from the cooling device. Thereby, the momentum of the water injected from the water injection device can be efficiently increased by the air injected from the air injection device.

[0024]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 (a) and 1 (b) are views showing a drainer according to an embodiment of the present invention. The steel plate 2 is transported by the transport roll 5 and moves in a line traveling direction 7 indicated by an arrow. Fluid ejecting devices 13 and 14 are disposed above the moving steel plate 2 downstream of the upper surface cooling device 1 in the line traveling direction. Fluid ejection devices 13, 14
Has a plurality of nozzles 21 arranged in the width direction of the line. In the present embodiment shown in FIG. 1, four nozzles 21 are provided for each fluid ejection device, but the number of nozzles may be increased or decreased according to the width of the steel plate. When the width is narrow, one wire may be used. Each nozzle 2
1 is formed so as to form a predetermined angle と with the line width direction so that the jetting direction is directed toward the upper surface cooling device 1 and the fluid can be jetted toward the side edge 2 a of the steel plate 2. (See FIG. 2).

From the nozzle 21 of the fluid ejecting device 13 located near the upper surface cooling device 1, water can be ejected as a fluid (hereinafter, referred to as "water ejecting device"). Further, air can be jetted as a fluid from the nozzle 21 of the fluid ejection device 14 farther than the water ejection device 13 from the upper surface cooling device 1 (hereinafter, referred to as “air ejection device”).

As shown in FIG. 2B, the nozzles 21 of the fluid ejecting device (water ejecting device) 13 and the fluid ejecting device (air ejecting device) 14 have an angle θ in the range of 10 ° to 60 °. , So that the fluid spreads in a fan shape and is ejected. As such a fluid ejection nozzle, for example, a flat spray type nozzle may be used. The reason for limiting the spread angle θ to 10 to 60 ° is that θ
Is larger than 60 °, the fluid ejected from the nozzle spreads, so that the collision force applied to the retained water is dispersed and the effect of accompanying the retained water is reduced. If θ is reduced to less than 10 °, the area colliding with the stagnant water is reduced, so that the collision pressure per unit area can be increased. However, cooling water leaking from the space between the nozzles is generated, and the drainage effect is reduced. incomplete. In addition, if a large number of nozzles having a spread angle θ of less than 10 ° are arranged, a good draining effect can be obtained, but this is economically disadvantageous because equipment costs and operation costs increase. In addition to the fan-shaped nozzle (flat spray type) described above, a nozzle that expands in an elliptical shape (elliptic nozzle type), a nozzle that expands in a square shape (square-blow nozzle type), and the like can also be used as nozzles to be attached to the fluid ejection device. However, since it is more effective to reduce the area where the drainage fluid collides with the stagnant water and increase the collision pressure, the effect of accompanying the stagnant water is high, the fan-shaped nozzle (flat spray type) is preferable.

FIGS. 2A and 2B are plan views illustrating the mounting angle of the nozzle when the fluid ejecting apparatus is viewed from above. It is preferable to form the nozzle 21 by forming a nozzle mounting angle の in the range of 15 ° to 75 ° with the line width direction 8 toward the upper surface cooling device 1 side. FIG. 2 (b)
Indicates the geometric positional relationship of the nozzles. FIG.
As shown in (b), the edge of the fluid ejected from the nozzle 21 at an angle θ of 10 ° or more and 60 ° or less is defined as an edge 22 that is closer to being parallel to the line width direction 8. Angle α formed by line width direction 8 and edge 22
Becomes 0 ° or a negative value, the velocity component has a velocity component in a direction opposite to that of the upper surface cooling device 1 in the line traveling direction, so that the retained water leaking from the upper surface cooling device 1 is entrained by the draining fluid. Even if it can be done, the fluid ejection devices 13, 1
The gas is discharged downstream of the nozzle 4. Further, in order to actually discharge the stagnant water on the upstream side of the fluid ejecting devices 13 and 14, the stagnant water must be pushed back to some extent, so that the condition of the expression (1) needs to be satisfied.

Α = ψ−θ / 2 ≧ 10 ° (1) where α is the angle formed by the line width direction and the edge closer to parallel to the line width direction of the fluid ejected from the nozzle. ψ: Angle formed by the line width direction and the nozzle θ: Spread angle of the fluid ejected from the nozzle On the other hand, the edge of the fluid ejected from the nozzle at the spread angle θ is closer to the edge in parallel with the line traveling direction. 2
Defined as 3. If the angle β formed by the line width direction and the edge 23 exceeds 90 °, the edge 23 is jetted in a direction opposite to the other edge 22, so that the accumulated water may be discharged in the same width direction of the steel sheet. become unable. Also,
In order to make the retained water accompany efficiently, it is necessary to satisfy the condition of the expression (2).

Β = ψ + θ / 2 ≦ 80 ° (2) where β is the angle formed by the line width direction and the edge closer to parallel to the line advancing direction of the jet fluid ejected from the nozzle. As described above, the range θ of the spread angle of the nozzle is 1
Efficient drainage cannot be performed unless the angle is not less than 0 ° and not more than 60 °. Therefore, when 10 °, which is the narrowest spread angle of the nozzle, is adopted, the nozzle mounting angle in the line width direction is obtained from the expressions (1) and (2). It must be provided so as to form an angle of 15 ° or more and 75 ° or less with the line width direction. for that reason,
The limited range of the present invention is a value when a nozzle having the narrowest spread angle is employed. When a nozzle having a wide divergence angle is used, the mountable range is narrower than the limited range of the present invention. Therefore, it is necessary to determine the mount angle so as to fall within the ranges of Expressions (1) and (2).

Next, FIG. 3 is a side view for explaining the inclination angle with respect to the line advancing direction when the fluid ejecting device provided downstream of the upper surface cooling device is viewed from the side. The nozzle 21 forms an angle φ of 5 ° or more and 80 ° or less with the vertical direction 9, and is provided so as to be able to spray toward the upper surface cooling device 1 side and the lower steel plate 2 side. When the angle φ is out of this range, for example, when the angle φ exceeds 80 °, the jetting direction of the draining fluid becomes nearly parallel to the line traveling direction, so that it becomes difficult for the draining fluid to reach the steel plate. When the angle φ is less than 5 °, the collision angle of the draining fluid is almost perpendicular to the direction in which the retained water flows out, and the velocity component in the line traveling direction becomes smaller, so that the retained water is pushed back to the upstream side. Becomes smaller. As a result, it is difficult to discharge from the lateral edge of the steel plate accompanying the fluid.
Therefore, φ is preferably an angle of 5 ° or more and 80 ° or more.

By injecting the draining fluid with the nozzle arrangement and the installation angle as described above, the draining fluid having a large collision pressure and a large momentum with respect to the flow of the stagnant water is caused to efficiently collide with the stagnant water. This allows the accumulated water to accompany the flow of the draining fluid after colliding with the upper surface of the steel sheet, change the direction of the movement of the accumulated water, and be discharged from the lateral edge of the steel sheet. Draining can be achieved efficiently.

In the present invention, it is also possible to use a drainer in contact with the upper surface of the steel sheet. In this case, a drain roll is provided between the upper surface cooling device and the water injection device.
As shown in FIG. 4, a draining roll 4 is provided downstream of the upper surface cooling device 1, a water injection device 13 is provided downstream of the draining roll 4, and an air injection device 14 is provided downstream of the water injection device 13. The draining roll 4 can dampen the retained water to some extent, and the retained retained water is discharged from the edge 2a of the steel sheet on the upstream side of the draining roll 4. And
The fluid may be ejected from the nozzle 21 to the retained water leaking downstream from the gap between the draining roll 4 and the steel plate 2, so that the capability of discharging the retained water is further improved. When the draining rolls 4 are used in this manner, the accumulated water can be easily discharged even when the amount of the cooling water jetted from the upper surface cooling device 1 is extremely large.

In order to enhance the draining effect, it is preferable to provide a nozzle at a distance as short as possible from the steel plate and spray the draining fluid because the fluid pressure and speed are less attenuated. However, if the nozzle is brought too close to the steel plate, the steel plate comes into contact with the nozzle and may be damaged. Therefore, a comb-shaped guard 6 for protecting the nozzle may be provided as shown in FIG. The form of the guard is not limited to a comb-like form, but may be a simple form such as a plate-like form with a hole at the nozzle installation position. By providing the guard, the nozzle can be provided at a position closer to the steel plate.

As described above, in this embodiment, the example in which the fluid ejecting device and the draining roll are provided on the downstream side (outside) of the control cooling device for the thick plate is shown, but it is provided on the upstream side (inlet side) of the cooling device. You may. Further, it may be provided on both the downstream side and the upstream side. Further, the present invention can be applied to devices other than the cooling device such as a rolling mill and a straightening machine.

[0036]

Next, the present invention will be described with reference to embodiments.

Using the water draining device of the present invention shown in FIG. 1, a test material having a thickness of 30 mm and a width of 4500 mm was moved at a speed of 50 mpm, and the steel plate was drained after passing through a top cooling device (control cooling device). did. Nozzle θ = 30 °, ψ =
45 ° and φ = 45 ° were set, and the water nozzle flow rate and the air nozzle flow rate of the fluid ejection device were as shown in FIG. Then, the temperature deviation in the width direction of the steel plate after draining, the mechanical test result, and the plate shape were examined. The results are also shown in FIG.

For comparison, the same test material as that of the present invention was moved at the same speed, and draining was performed using the apparatus shown in FIG. 9 having a drain roll downstream of the cooling device (hereinafter, "conventional example 1"). ). Further, for the test material under the same conditions, the device shown in FIG. 8 equipped with a water injection device using a water nozzle and an air injection device using an air nozzle was used to perform the draining by injecting a draining fluid from a direction opposite to the line traveling direction. (Hereinafter referred to as “conventional example 2”). The results are also shown in FIG.

As can be seen from FIG. 6, in the conventional example 1 using the draining roll, there was much water leakage from the draining roll, and a temperature deviation of 150 ° C. occurred in the sheet width direction. As a result, mechanical test results varied widely in the plate width direction. Furthermore, since a large warpage occurred in the steel sheet due to the temperature deviation, steps such as pressing and heat straightening were required.

In the conventional example 2 in which the draining fluid is jetted in a direction opposite to the traveling direction of the steel sheet, the drainage is partially defective, and retained water remains. As a result, a temperature deviation of 100 ° C. occurred in the width direction, and the mechanical test results varied widely in the plate width direction. Furthermore, since a large warpage occurred in the steel sheet due to the temperature deviation, steps such as pressing and heat straightening were required.

On the other hand, in the example of the present invention, 3
Only a temperature deviation of about 0 ° C. occurred, and as a result, the mechanical test results were also good in the sheet width direction. Also, no warpage occurred.

Although the embodiment applied to the rolling process of thick plate rolling has been described above, it is needless to say that the present invention is not limited to this and can be applied to a process of a hot rolled steel strip or the like.

[0043]

As apparent from the above description, the present invention has the following useful effects. In cooling the high-temperature steel sheet, stagnant water is discharged from the side edge of the steel sheet by injecting fluid obliquely to the line travel direction toward the cooling device, and the steel sheet is uniformly cooled in the width direction Thus, the variation in the material and the deformation of the steel sheet are reduced, the product yield of the steel sheet is improved, the work for straightening the steel sheet is reduced, and the manufacturing cost can be reduced. By discharging the fluid obliquely to the line traveling direction and changing the direction of motion of the retained water, the retained water can be discharged with less momentum than injecting the fluid from the direction opposite to the line traveling direction. And equipment and operating costs can be reduced. By separately jetting the water injection device and the air injection device from each other, the drop of the steel plate temperature due to supercooling is prevented, and the momentum of water is efficiently increased by air injection,
The accumulated water can be efficiently discharged. By combining the draining rolls, the retained water can be damped to some extent by the draining rolls, and the fluid is jetted against the retained water leaking from the gap between the draining rolls and the steel sheet, so that the amount of cooling water ejected from the cooling device is reduced. Even in a very large case, the retained water can be easily discharged. By providing the nozzle guard, the nozzle can be provided at a position closer to the steel plate, a stronger collision pressure of the fluid can be obtained, and the retained water can be discharged with high efficiency.

[Brief description of the drawings]

FIG. 1A is a plan view and FIG. 1B is a side view showing a drainer according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating a tilt angle of a nozzle with respect to a line width direction according to the embodiment of the present invention.

FIG. 3 is a side view illustrating an inclination angle of a nozzle with respect to a line advancing direction according to the embodiment of the present invention.

4A and 4B are a plan view and a side view, respectively, showing a draining device provided with a draining roll according to an embodiment of the present invention.

FIGS. 5A and 5B are a plan view and a side view, respectively, showing a drainer provided with a comb guard according to the embodiment of the present invention.

FIG. 6 is a table comparing an example of the present invention and a conventional example in an example of the present invention.

FIG. 7 is a plan view showing a drainer according to Prior Art 1.

8A is a plan view and FIG. 8B is a side view showing a draining device according to Prior Art 2. FIG.

FIG. 9 is a side view showing a draining device according to Prior Art 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Top surface cooling device 2 Steel plate 2a Edge of steel plate 3 Fluid injection nozzle 4 Drain roll 5 Conveyance roll 6 Guard 7 Line advancing direction 8 Line width direction 9 Vertical direction 11 Fluid injection device provided with water nozzle of comparative example 12 Comparison Fluid ejecting device provided with air nozzle of example 13 Fluid ejecting device provided with water nozzle of the present invention 14 Fluid ejecting device provided with air nozzle of the present invention 21 Nozzle 22 Fluid ejected from nozzle Edge near parallel to the line width direction 23 Edge near parallel to the line travel direction of fluid ejected from the nozzle

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toru Kawanaka 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Toshio Miyazato 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Sun (72) Inventor Yukihiro Okada 1-2-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 4K034 AA02 BA04 CA01 DB03 DB04 FA05 FB03 FB05 FB15 GA18 4K043 AA01 BA04 CB01 EA07 FA13 GA06

Claims (7)

[Claims] 1. A fluid ejecting apparatus having one or more nozzles at a position upstream and / or downstream of a cooling device provided in a line and above a steel plate in a line traveling direction and in a line traveling direction. Disposed two or more, at least water from the fluid ejecting device arranged at a position closest to the cooling device, at least air from the fluid ejecting device arranged at a position farthest from the cooling device, Each of the nozzles is configured to be capable of jetting, and a fluid is jetted from the nozzle in a direction toward the upper surface of the steel plate and the cooling device side, and toward a side edge of the steel plate, and the stagnation of the upper surface of the steel plate. A method for draining hot steel sheet, wherein water is discharged from the steel sheet together with the fluid injected from the nozzle. 2. A fluid ejecting apparatus having one or more nozzles at a position upstream and / or downstream of a cooling device provided on a line in a line traveling direction and above a steel plate in a line traveling direction. At least the fluid ejecting device arranged at a position closest to the cooling device, the fluid ejecting device arranged at least at a position farthest from the cooling device with water from the nozzle. Is configured to be able to inject air from the nozzle, respectively, the nozzle is directed toward the upper surface of the steel plate and the cooling device side, and toward the side edge of the steel plate toward the side. A high-temperature steel plate draining device characterized by being configured to be capable of jetting. 3. The device for draining high temperature steel sheet according to claim 2, wherein the nozzle is configured so that the fluid spreads in a fan shape at an angle within a range of 10 to 60 ° and can be jetted. 4. The nozzle according to claim 1, wherein said nozzle is arranged in a line width direction.
The device for draining high-temperature steel sheets according to claim 2 or 3, wherein the device is formed so as to be able to spray toward the cooling device side at an angle of 5 °. 5. The nozzle is formed so as to form an angle of 5 to 80 ° with respect to a vertical direction and to be able to jet toward the cooling device side and the upper surface side of the steel plate.
The hot-water steel plate drainer according to the above. 6. The high-temperature steel sheet according to claim 2, wherein a draining roll is provided between the cooling device and the fluid ejecting device capable of injecting water so as to contact a top surface of the steel plate. Drainer. 7. The high-temperature steel plate drainer according to claim 2, wherein the fluid ejecting device is provided with a guard for preventing the nozzle from coming into contact with the steel plate.