JP4254044B2 - Method and apparatus for draining high temperature cooled plate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In this invention, when a cooled plate such as a hot-rolled hot rolled steel plate is cooled with a cooling device in a line such as a hot rolling line, the cooling water staying on the cooled plate to be cooled is The present invention relates to a draining method and apparatus for discharging air by fluid ejection.
[0002]
[Prior art]
The hot-rolled steel sheet may be water-cooled at the same time on the upper and lower surfaces by a cooling device installed downstream of the rolling mill in the line traveling direction in order to make the material uniform and improve mechanical properties. Many. The cooling temperature in this case is adjusted according to the purpose of use of the material, and it is necessary to uniformly cool the width direction and the longitudinal direction to the temperature specified for the upper surface and the lower surface. For this purpose, it is important to flow the designated water flow rate on the steel plate surface for the designated time within the designated range of the upper and lower surfaces of the steel plate. However, since the cooling water stays as it is on the upper surface of the steel plate, only the upper surface is particularly supercooled, and a temperature difference tends to occur within the plate. If a shape defect after cooling occurs due to this temperature difference, it is necessary to perform cold press correction or reheating correction, resulting in an increase in manufacturing cost. Furthermore, if the cooling temperature of the steel sheet varies, it also leads to variations in mechanical characteristics and the like, leading to a decrease in quality and a decrease in yield.
[0003]
Therefore, in order to perform uniform cooling over the entire surface, it is important to quickly remove the steel sheet from the steel plate surface so as not to cause overcooling due to stagnant water outside the specified range.
[0004]
For this purpose, the following methods (1) and (2) have been conventionally performed.
[0005]
(1) A method of preventing the leakage of water outside the cooling range by holding down the cooled plate by the conveying roll arranged on the lower surface of the steel plate (cooled plate) and the water draining roll arranged above it to stop the cooling water. (Hereinafter referred to as “prior art 1”).
[0006]
(2) One or more injection nozzles are installed on the side of the line to be cooled or across the plate in the vertical direction, and water or air is injected to stay on the upper surface of the plate to be cooled. (Hereinafter referred to as “prior art 2”).
[0007]
However, when quenching with a large amount of cooling water after rolling in a hot-rolled steel sheet line, or when quenching a wide material like a thick steel plate after rolling, a large amount of stagnant water remains to be removed. Therefore, the prior art 1 and 2 cannot sufficiently drain water.
[0008]
As a technique for removing such a large amount of surface stagnant water, Japanese Examined Patent Publication No. 62-030244 discloses a method of combining water injection and air injection as shown in (3) below.
[0009]
(3) A fluid ejection device having a plurality of water ejection nozzles at a position close to the cooling device on the downstream side (upstream side) of the cooling device, and a fluid ejection having a plurality of air ejection nozzles at a position farther than the fluid ejection device An apparatus is disposed, and the draining fluid is ejected from the two fluid ejecting apparatuses in the opposite direction to the cooling water flowing direction to block the cooling water (residual water) retained on the upper surface of the steel sheet (hereinafter, “ Prior art 3 ”).
[0010]
[Problems to be solved by the invention]
However, the prior art has the following problems.
[0011]
The method of pressing down the cooled plate 2 by the upper and lower rolls 20 of the prior art 1 to stop the cooling water is that the thickness of the steel plate after cooling is uniform, the plate is not warped or bent, and the parallelism of the upper and lower rolls is If it is good, there is no wear of the roll itself, and there is no gap between it and the plate to be cooled, good drainage performance will be exhibited. As a result, a water leak occurs and sufficient draining is not performed (see FIG. 16).
[0012]
The method of injecting water or air independently from the upper side or the side of the cooling plate conveyance line of the prior art 2 using a jet nozzle 21 is a case where the plate width is relatively small or when the upper surface staying water is small. Some drainage is possible. When there is a large amount of stagnant water, methods to increase the number of water or air injection nozzles or increase the injection pressure or flow rate are used. Further, since the jetted water remains on the surface, it is difficult to completely remove the water from the upper surface of the plate to be cooled. Further, the method of increasing the air injection requires a considerably large pressure and flow rate of the injection air to secure the momentum of the air that can remove a large amount of stagnant water. There was a problem that would become excessive. (See FIGS. 17 and 18).
[0013]
Prior art 3 was superior to previous techniques in draining large amounts of accumulated water in that it combines water jet with a large fluid momentum and air jet with high moisture removal capability. However, since the fluid ejection direction is rearward and parallel to the traveling direction of the plate, in order to achieve both water drainability and prevention of overcooling of the plate, necessary ejection is performed according to the flow rate of the cooling water. The amount needed to be controlled.
[0014]
Furthermore, there is no special idea regarding the arrangement method of each injection nozzle, and there is a problem that the minimum required water and air are not always effectively used. There is also a problem that there is nothing that contributes to a space-saving installation space and it cannot be used due to the installation location. (See FIGS. 12 and 13).
[0015]
Accordingly, the object of the present invention is to solve the above-mentioned problems of the prior art, and drain the stagnant water staying on the upper surface of a high temperature cooled plate such as a hot rolled steel plate so as not to enter another bank. Then, it is providing the draining method and apparatus of the high temperature to-be-cooled board which can be discharged | emitted from the upper surface of a board.
[0016]
[Means for Solving the Problems]
According to the first aspect of the present invention, the water draining method is provided on the downstream side of the line traveling direction with respect to the cooling device provided on the line, or on both the downstream side and the upstream side and above the plate to be cooled that moves along the line. Two or more fluid ejection devices having one or a plurality of nozzles are disposed at a position in the line traveling direction, and at least water from the fluid ejection device disposed at a position closest to the cooling device. The fluid ejecting device disposed at a position farthest from the cooling device is configured such that air can be ejected toward the upper surface of the cooled plate, and the fluid ejecting direction of the nozzle is the direction toward the cooling device. In the direction of the edge of one side of the plate to be cooled, the angle of 0 to 45 degrees or 135 to 180 degrees with respect to the direction perpendicular to the direction of the plate to be cooled in the horizontal plane of the plate to be cooled. In range, And, so as to be in the range of obliquely downward 30 to 90 degrees with respect to the vertical downward direction, arranged said nozzle, further, the fluids are between the fluid injection device mutually at least next ejected from each nozzle the Nozzles are arranged so that they do not overlap on the upper surface of the plate to be cooled, fluid is ejected from the nozzles arranged in this way, and the accumulated water on the upper surface of the plate to be cooled is associated with the fluid ejected from the nozzles. And discharging from the cooled plate.
[0017]
The invention of the draining device according to claim 2 is provided on the downstream side of the line traveling direction from the cooling device provided in the line, or on both the downstream side and the upstream side and above the plate to be cooled that moves along the line. A fluid ejecting apparatus having one or a plurality of nozzles at a position, wherein the fluid ejecting apparatus is disposed two or more in a line traveling direction, and is disposed at a position closest to at least the cooling device; Water is ejected from the apparatus, and at least from the fluid ejecting apparatus disposed at a position farthest from the cooling apparatus, air can be ejected toward the upper surface of the plate to be cooled. The direction is the direction toward the cooling device, and the direction of the edge on one side of the cooled plate is 0 to 45 degrees with respect to the direction perpendicular to the moving direction of the cooled plate in the horizontal plane of the cooled plate. ,is there Is in the range of 135 to 180 degrees, and has been arranged to be within a range of oblique downward 30-90 degrees with respect to the vertical downward direction, is between the fluid ejection device mutually at least next ejected from the nozzles The nozzles are arranged so that the fluids to be overlapped do not overlap on the upper surface of the plate to be cooled.
[0018]
According to a third aspect of the present invention, the fluid ejecting apparatus includes a main pipe for supplying a fluid and the nozzle connected to the main pipe, and the main pipe includes an inner pipe and an outer pipe. The nozzle is connected to each of the inner tube and the outer tube, and is configured to be able to supply water from one of the outer tube and the inner tube and air from the other. It has the characteristic in being.
[0019]
According to a fourth aspect of the present invention, the nozzle is configured such that the mounting angle can be adjusted, and the direction and angle of the fluid to be ejected can be adjusted and changed.
[0020]
According to a fifth aspect of the present invention, the fluid ejecting apparatus includes a main pipe for supplying a fluid, the nozzle, and a connecting pipe made of an elastic material for connecting the main pipe and the nozzle. And the attachment angle of the nozzle can be adjusted or changed by the action of the connection pipe.
[0021]
The water jet from the nozzle has a large momentum of fluid and a high ability to remove stagnant water, but even a little jet water remains on the surface of the cooled plate such as a steel plate. It is difficult to remove. For this reason, in the present invention, a plurality of fluid ejecting apparatuses having one or more nozzles are prepared, and water is at least the position farthest from the cooling apparatus disposed at the position closest to the cooling apparatus. A relatively small amount of stagnation that could not be removed by water jetting by disposing air from the fluid jetting device arranged in the position so that air can be jetted and performing air jet from a position farther from the cooling device than water jetting. Water can be removed by the blast air, and the remaining water remaining on the upper surface of the plate can be discharged almost completely.
[0022]
Further, in the present invention, the nozzle injection direction is defined as the direction toward the cooling device and the direction toward the edge of one side of the plate to be cooled. In other words, the spraying direction of the water and air nozzles is defined so as to be a direction perpendicular to one side with respect to the traveling direction of the plate or an oblique direction on one side. Preferably, the nozzle injection direction is a direction toward the cooling device, and an angle from 0 to 45 degrees, or from 135 to 180 degrees {0 to 45 degrees with respect to a direction orthogonal to the cooling plate traveling direction. angle in a range of degrees (135 to 180 degrees), i.e., prescribed in the injection angle of 45 degrees}. As a result, the accumulated water can be discharged from the edge portion on one side (one side) of the steel sheet accompanying the fluid.
[0023]
Further, at least the ejection positions of the nozzles of the adjacent fluid ejection devices are defined so that the ejection fluids do not overlap on the upper surface of the plate. Thereby, the momentum of the fluid from each spray nozzle can be made to act uniformly and effectively in the width direction.
[0024]
By the above method, regardless of the amount of staying water to be removed, all staying water can be instantaneously blown to the edge portion on one side of the plate with a constant injection amount. In this way, the present invention instantaneously blows away the stagnant water to the outside of the cooling range of the plate surface, so there is no concern that the plate to be cooled will be overcooled.
[0025]
In addition, the flow rate of jet water and jet air that can completely remove a large amount of stagnant water is small compared to the conventional example, which is advantageous in terms of space saving, and does not require special jet flow control. It is also advantageous in terms of operating costs.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0027]
1 and 2 are drawings according to a first embodiment of the present invention. 1 and 2, the arrow A indicates the line traveling direction, and the steel plate (cooled plate) 2 conveyed on the roller table 18 travels in the direction of arrow A from the upstream side to the downstream side.
[0028]
A water injection device 3 and an air injection device 4 are arranged in the line width direction at a position above the moving steel plate 2 downstream of the cooling device 1 in the line traveling direction. The water injection device 3 is located on the upstream side, and the air injection device 4 is located on the downstream side of the water injection device 3. The water injection device 3 includes a water supply main pipe 5 for supplying water and a plurality of water supply nozzles 7 attached to the main pipe 5. The air injection device 4 includes an air supply main pipe 6 for supplying air and an air supply nozzle 8 attached to the main pipe 6. The water injection device 3 and the air injection device 4 are divided into upstream and downstream, and the water injection device 3 is disposed at a position close to the cooling device 1 and the air injection device 4 is disposed at a position farther from the water injection device 3. The momentum of water injected from the air injection device 4 can be efficiently increased by the air injected from the air injection device 4. If draining is performed only with the water jetting device 3, the steel plate is supercooled by the jetted draining fluid (water), so the temperature of the entire steel plate is lowered. Furthermore, when the water and air injection devices 3 and 4 are provided at the same position, a water draining fluid (water + air) in which water and air are mixed, water becomes droplets and continuously gives momentum to the staying water. Can not be. 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 accumulated water on the steel plate increases, the collision pressure per unit area decreases, and water efficiently And the momentum that the air has cannot be given to the stagnant water on the steel plate.
[0029]
The water nozzle 7 and the air nozzle 8 are attached so that the injection direction of the fluid (water or air) is the direction toward the cooling device 1 and the direction of the edge 2a on one side (one side) of the steel plate 2. ing. Thereby, the stagnant water 19 is blown out from the edge 2a on one side (one side) of the steel plate 2 to the outside of the steel plate.
[0030]
There is also a method in which the nozzles 7 and 8 are distributed and sprayed from the center of the steel plate 2 to both sides, but this method is not preferable because the residual water remaining in the central portion of the steel plate cannot be removed.
[0031]
About the injection direction of a nozzle, it is preferable to set so that the momentum of injection water and injection air may act effectively, and a stagnant water may be blown off to the side of a plate surface in a short time. Therefore, the angle alpha {FIGS. 2 (a) see} in the traveling direction horizontal plane of the plate, and the cooling plate traveling direction from one side as in the present embodiment the cooling device side (upstream side) It is preferable to be within a range of 0 to 45 degrees or 135 to 180 degrees with respect to the orthogonal direction . The fluid ejecting apparatus can be provided not only on the downstream side of the cooling apparatus but also on the upstream side. In this case, the injection direction is an angle of 0 to 45 degrees or 135 to 180 degrees toward the downstream side of the cooling device.
[0032]
Further, with respect to the angle β {see FIG. 2 (b)} with respect to the horizontal plane of the plate in order to effectively utilize the momentum of the jet water and the jet air and to prevent the jet water from rebounding, the cooling device To the side (upstream side), it is in the range of 30 to 90 degrees obliquely downward with respect to the vertically downward direction , preferably in the range of 45 to 60 degrees. When the fluid ejection device is provided on the upstream side of the cooling device, the above angle is set toward the downstream side.
[0033]
As shown in FIG. 2, the main pipes 5 and 6 of the fluid ejection devices 3 and 4 and the ejection nozzles 7 and 8 are configured so that the fluid (water 9 and air 10) ejected from the nozzles 7 and 8 is almost the full width of the steel plate 2. Install so as to hit. In particular, in the water injection device 3 at the most upstream side, that is, the position closest to the cooling device 1, the nozzle 7 is attached and blown so that the injection water 9 also hits the edge (side end) 2 a of the steel plate 2 without leakage. Prevent leftovers.
[0034]
The types of the injection nozzles 7 and 8 are not particularly specified, but general-purpose injection nozzles for injecting water or air into a fan shape, a semi-fan shape, a linear shape, or the like may be used alone or in combination. As in the conventional method (FIGS. 12 and 13), in the method of spraying backward in parallel with the traveling direction of the plate, if a linear spray nozzle having a narrow spray range is used, a streaky blown residue corresponding to the nozzle interval is generated. However, in the case of the present invention, since injection is performed toward the edge on one side of the plate, it is possible to use a linear injection nozzle having a large fluid momentum, and the stagnant water removal capability is improved. .
[0035]
With respect to the arrangement of the ejection nozzles, as shown in FIGS. 1 and 2, the nozzle ejection positions of the ejection nozzles 7 and 8 of at least the adjacent fluid ejection devices 3 and 4 are arranged so as not to overlap on the upper surface of the steel plate 2. To do. When the nozzles are arranged as in the comparative example shown in FIGS. 3 and 4, the degree of effective use of the momentum of the jet water and the jet air becomes small, and the nozzle interval needs to be made smaller. Therefore, it should be arranged as shown in FIGS.
[0036]
5 to 7 are drawings according to a second embodiment of the present invention. Due to problems such as installation space, as shown in the first embodiment (FIGS. 1 and 2), it may be difficult to dispose water and air fluid ejection devices separately. In such a case, the main pipe of the fluid ejecting apparatus is a double pipe 11, and as shown in FIG. 6, FIG. 7 (a) or (b), the water nozzle 12 is provided in the inner pipe 11a and the air is provided in the outer pipe 11b. The nozzle 13 is attached, and the water and air can be ejected by one fluid ejecting apparatus with the inner tube 11a used for water supply and the outer tube 11b used for air supply. Either the inner tube or the outer tube may be used for supplying water or air. The double tube as shown in FIGS. 5 to 7 is an example for performing water injection and air injection in a space-saving manner. A method of combining water injection and air injection and blowing off instantaneously to the edge on one side in the traveling direction is included in the present invention even if the pipe shape is other than the above.
[0037]
8 and 9 are drawings according to a third embodiment of the present invention, and FIG. 10 is a conventional example. Conventionally, as shown in FIG. 10, a main pipe 16 and a nozzle 17 are coupled by fastening or welding with a flange / bolt using a connecting pipe 15 made of a steel pipe. In the present embodiment, as shown in FIGS. 8 and 9, the main pipe 16 and the nozzle 17 are connected to a connecting pipe made of a deformable elastic material having water resistance, heat resistance and pressure resistance according to equipment, for example, The hose 14 or rubber tube is used for connection. As a result, the installation of the nozzle 17 can be adjusted after installation of the main pipe 16 during installation in the cooling device, so that the work load can be reduced and the injection angle can be adjusted optimally according to the operating conditions. Therefore, the equipment can be repaired easily.
[0038]
【Example】
Next, the present invention will be described with reference to examples.
[0039]
The test uses a wide-width material (hot rolled steel plate having a width of 5000 mm and a thickness of 30 mm) that exhibits the most difference in effect, and the cooling water flow rate of the control cooling device 1 is 500 to 1000 l (liter) / min · m ² . Medium. The fluid ejection devices 3 and 4 were attached to the outlet side (downstream side) of the cooling device 1 and drained. The plate 2 was passed through the cooling device 1 at a speed of 50 mpm. The arrangement of the water injection nozzle 7 and the air injection nozzle 8 is a system in which water and air are injected in parallel with the traveling direction of the plate 2 toward the cooling device 1 shown in FIGS. 12 and 13 (hereinafter referred to as “conventional example”). 3 and 4, in the case of a nozzle arrangement where the collision positions on the plate surface of the jet water and jet air overlap (hereinafter referred to as “comparative example”), the plate surface of the jet water and jet air shown in FIGS. It was assumed that the nozzles were arranged so that the upper collision positions did not overlap (hereinafter referred to as “Example 1 of the present invention”). As the spray nozzles, fan spray nozzles having a spray angle of 40 degrees were used. And about the staying water removal effect, the result compared with the water nozzle flow rate, the air nozzle flow rate, staying water removal, the width direction temperature deviation, a mechanical characteristic, and plate shape is shown in FIG.
[0040]
As can be seen from FIG. 11, in the conventional example and the comparative example, the flow rate of water injection and air injection and the number of nozzles are the same, but in the conventional example, streaky stagnant water is generated, the temperature distribution in the width direction, mechanical Variations occurred in the characteristics.
[0041]
In Example 1 of the present invention, the nozzles were arranged so that the collision positions on the plate surface of the jet water and jet air did not overlap, so the number of nozzles and the flow rate were reduced to 60% compared to the conventional example and the comparative example. However, the variation in mechanical properties was further reduced and there was no overcooling, so the plate shape after air cooling was further improved and flattened.
[0042]
Next, the cooling water flow rate of the cooling device 1 was increased to 1000 to 2000 l (liter) / min · m ² . As shown in FIG. 15, the water draining was performed by arranging two water injection devices 3 and arranging the water injection nozzles in a plurality of rows (hereinafter referred to as “Example 2 of the present invention”). The result about the stagnant water removal effect is shown in FIG.
[0043]
As can be seen from FIG. 14, according to the present invention example 2, even in the case where the water nozzle flow rate is slightly insufficient in the present invention example 1, an excellent effect was obtained.
[0044]
As shown in Invention Examples 1 and 2, since the nozzle spacing can be sufficiently secured by arranging the spray positions from the spray nozzles so as not to overlap, there is no buffer between the fan-shaped spray water, and the spray water You can make the most of your momentum. In addition, since the nozzles are arranged so that all water and air injection directions are directed toward the cooling device and toward the edge of one side (one side) of the plate, it follows the fluid. Thus, the accumulated water can be discharged from the edge portion on one side of the steel plate, the spray water does not remain on the plate surface, and supercooling does not occur.
[0045]
In addition, by arranging so that the spray positions from the spray nozzles do not overlap, even when the total number of nozzles is increased with a plurality of nozzle rows as shown in Example 2 of the present invention, a sufficient nozzle interval can be secured, There is no buffer, the momentum of the water jet can be utilized to the maximum, and effective draining can be performed.
[0046]
【The invention's effect】
As described above, according to the present invention, the control cooling accuracy of a plate to be cooled such as a high-temperature steel plate is improved, and in particular, uniform cooling in the width direction of the plate is possible, and the shape after cooling is corrected to be flat. The correction work is reduced, the manufacturing cost can be reduced, the variation in material characteristics, and the warping and deformation that are rejected are reduced, so that the product yield is improved and thus a useful effect is brought about.
[Brief description of the drawings]
FIG. 1A is a plan view and FIG. 1B is a side view showing a water draining device according to a first embodiment of the present invention.
2A is a plan view and FIG. 2B is a side view showing in detail the nozzle arrangement of the draining device shown in FIG. 1;
FIG. 3A is a plan view and FIG. 3B is a side view showing a draining device according to a comparative example.
4A is a plan view and FIG. 4B is a side view showing in detail the nozzle arrangement of the draining device shown in FIG. 3;
FIG. 5A is a plan view and FIG. 5B is a side view showing a water draining device according to a second embodiment of the present invention.
FIG. 6A is a side view and FIG. 6B is a front view showing in detail a main pipe and nozzle arrangement of a draining device according to a second embodiment of the present invention.
7A is a side view of the first example, and FIG. 7B is a side view of the second example showing details of the main pipe and nozzle arrangement according to the second embodiment of the present invention.
FIG. 8 is a side view showing a drainer according to a third embodiment of the present invention.
FIG. 9 is a side view showing the operation of a connecting pipe made of an elastic material according to a third embodiment of the present invention.
FIG. 10 is a side view showing an example of a conventional draining device.
FIG. 11 is a chart showing a comparison between a conventional example, a comparative example, and an example 1 of the present invention according to an embodiment of the present invention.
12A is a plan view and FIG. 12B is a side view showing Prior Art 3 in which water injection and air injection are combined.
13A is a plan view and FIG. 13B is a side view showing a nozzle arrangement of Prior Art 3. FIG.
FIG. 14 is a chart showing Example 2 of the invention according to an example of the invention in comparison with Example 1 of the invention.
15A is a plan view and FIG. 15B is a side view showing a water draining device according to an embodiment 2 of the present invention.
16A is a plan view and FIG. 16B is a side view showing Prior Art 1 using a draining roll.
FIG. 17A is a plan view and FIG. 17B is a side view showing Prior Art 2 in which a fluid is ejected independently from the side.
18A is a plan view and FIG. 18B is a side view showing Prior Art 2 in which a fluid is independently jetted in parallel to a line traveling direction toward a cooling device.
[Explanation of symbols]
1 Cooling device 2 Steel plate (cooled plate)
2a Edge 1 of steel plate (one side) 3 Water injection device 4 Air injection device 5 Main pipe for supplying water 6 Main pipe for supplying air 7 Water nozzle 8 Air nozzle 9 Water 10 Air 11 Double pipe 11a Inner pipe 11b Outer pipe 12 Water nozzle 13 Air nozzle 14 Hose 15 Steel pipe 16 Main pipe 17 Nozzle 18 Roller table 19 Stagnant water 20 Roll 21 Nozzle A Line traveling direction (steel sheet traveling direction)

Claims (5)

One or more nozzles are positioned downstream of the cooling device provided in the line in the line traveling direction, or on both the downstream side and the upstream side and above the plate to be cooled that moves along the line. Two or more fluid ejecting apparatuses are disposed in the line traveling direction, water is disposed at least from the fluid ejecting apparatus disposed at a position closest to the cooling apparatus, and at least a position farthest from the cooling apparatus. The fluid ejecting apparatus is configured such that air can be ejected toward the upper surface of the cooled plate, and the fluid ejecting direction of the nozzle is the direction toward the cooling apparatus and is on one side of the cooled plate. In the direction of the edge , in the horizontal plane of the plate to be cooled, in the range of 0 to 45 degrees or in the range of 135 to 180 degrees with respect to the direction orthogonal to the traveling direction of the plate to be cooled, and with respect to the vertically downward direction Diagonal To be within a range of orientations 30-90 degrees, arranged said nozzle, further, the fluids are between the fluid injection device mutually at least next ejected from the respective nozzles do not overlap the upper surface of the object to be cooled plate The nozzle is arranged as described above, the fluid is ejected from the nozzle arranged in this way, and the accumulated water on the upper surface of the cooled plate is discharged from the cooled plate with the fluid ejected from the nozzle. A method for draining a high-temperature plate to be cooled. One or more nozzles are positioned downstream of the cooling device provided in the line in the line traveling direction, or on both the downstream side and the upstream side and above the plate to be cooled that moves along the line. The fluid ejecting apparatus includes two or more fluid ejecting apparatuses extending in the line traveling direction, and at least water from the fluid ejecting apparatus disposed at a position closest to the cooling apparatus is at least from the cooling apparatus. The fluid ejecting device disposed at a distant position is configured to be able to eject air toward the upper surface of the cooled plate, and the nozzle has a fluid ejecting direction toward the cooling device. In the direction of the edge on one side of the plate to be cooled, in the horizontal plane of the plate to be cooled, in the range of 0 to 45 degrees, or in the range of 135 to 180 degrees with respect to the direction orthogonal to the direction of the plate to be cooled. Oh Beauty, are arranged to be within a range of oblique downward 30-90 degrees with respect to the vertical downward direction, the fluids are in between the fluid injection device mutually at least next ejected from the nozzles, the cooling target plate Nozzle is arranged so that it may not overlap on the upper surface of a high-temperature to-be-cooled board draining device characterized by things.   The fluid ejecting apparatus includes a main pipe for supplying a fluid and the nozzle connected to the main pipe, and the main pipe has a double pipe structure including an inner pipe and an outer pipe, The high-temperature cooled plate according to claim 2, wherein the nozzle is connected to each of the inner tube and the outer tube, and is configured to be able to supply water from one of the outer tube and the inner tube and air from the other. Drainer.   The high-temperature-cooled plate draining device according to claim 2 or 3, wherein the nozzle is configured so that an attachment angle can be adjusted, and the direction and angle of the fluid to be ejected can be adjusted and changed.   The fluid ejecting apparatus includes a main pipe for supplying a fluid, the nozzle, and a connection pipe made of an elastic material for connecting the main pipe and the nozzle, and the nozzle is operated by the action of the connection pipe. The draining device according to claim 2, wherein the mounting angle can be adjusted or changed.

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