JPH081231A - Hot plate cooling device - Google Patents

Abstract

PURPOSE:To uniformize cooling of a hot plate by forming into a vertical edge shape, the end edge of a shield plate, which is provided between a nozzle for jetting cooling water and the hot plate, and the circumferential edge of holes for passing the cooling water and also forming a waste water discharging part at the end edge of the shield plate. CONSTITUTION:A shield plate 5 is cooled by the cooling water which is jetted from a nozzle 3 through holes 12 for passing the cooling water. The plate 5 is moved for a fixed dimension by a cylinder 11, shifting the positions of the nozzle 3 and the holes 12 so as to shield the cooling water. The end edge of the shield plate 5 is provided with a vertical edge 13, and the circumferential edge of the holes 12 for passing the cooling water is also provided with a vertical edge. The cooling water shielded by the shield plate 5 does not fall on a hot plate, but is discharged from a discharging part 14 provided at the end edge of the shield plate 5. The cooling water is shielded by moving a shield plate 6, and the cooling is adjusted in the width direction of the hot plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot run table after finish rolling in a hot rolling line, an on / off line cooling device for a thick plate rolling line, a cooling device for continuous hot plate materials such as a thin steel plate continuous casting facility.

[0002]

2. Description of the Related Art For example, it is possible to control the quality of a steel sheet after finishing rolling of a hot rolling line by keeping it in a predetermined temperature range by water cooling while running on a runout table while running. Very important above.

As a cooling device for this purpose, laminar flow cooling is widely used in which a plurality of nozzles arranged above a cooling plate material form a layered cooling water evenly in the width direction of the strip steel plate.

However, in this laminar flow cooling, the cooling water (board water) riding on the plate material after the collision of the cooling water with the plate material is accelerated and flows to both ends or one end of the plate material, whereby the edges of the plate material are cooled. There is a drawback that the cooling capacity to the part increases, which causes distortion in the width direction of the plate material and unevenness of the material.

As a measure against this, conventionally, the flow rate from a large number of nozzles (lamina flow nozzles) arranged in the width direction is adjusted, or a spacer for sealing is provided between the nozzles.
Alternatively, a method has been adopted in which a running water receiving gutter is provided below the nozzle and the water injection width is limited by means such as adjusting the position of the receiving gutter.

However, all of these measures are
Since it is difficult to quickly and reliably operate the spacer, the running water receiving gutter, etc., it is difficult to perform the operation.
In the gazette, a water receiving plate that moves in the width direction of the hot plate is provided between the laminar flow nozzle and the hot plate to adjust the water injection width, and a gutter is provided near the water receiving plate to receive water. A structure having a gutter for draining the cooling water received by the plate is disclosed.

However, in a normal laminar flow nozzle, a nozzle main pipe is continuously arranged in the length direction. In this structure, a water receiving plate is provided at two places in the nozzle main pipe, and a receiving gutter is provided at one place or Since the nozzles will be installed at two locations, the cooling capacity will be reduced by limiting the dimensional interval between the nozzle main pipes, and the cooling control in the longitudinal direction of the hot plate will not function at all, and the tip end in the longitudinal direction will not work. Edge supercooling is not improved.

Further, the applicant of the present application previously mentioned that
In Japanese Patent Application Laid-Open No. 0-5709, a shield is movably arranged between the both ends of the hot plate and the nozzle, between the upper and lower surfaces of the hot plate and the nozzle, and outside the header. Disclosed is one in which the cooling width can be adjusted while keeping the injection form of the cooling water constant.

With this cooling device, for example, both side edges which are inevitably formed in a hot plate rolled in a thick plate rolling line,
Controlled cooling that accurately stops cooling water injection only to the cooling section at the tip and tail ends, and it is also possible to arbitrarily change the stop area, and it is possible to sufficiently respond to changes in steel grade or operating conditions. There is an advantage that can be obtained.

[0010]

However, when such a structure is applied to the header for cooling the upper surface to control the cooling in the longitudinal direction of the hot plate, the injected cooling water is temporarily heated by the shield plate. Although it does not fall on the plate, when the shield is returned to the original position for normal cooling, the cooling water that was blocked by the shielding plate until then falls on the hot plate and the amount of cooling water temporarily increases, This becomes a disturbance factor of cooling,
There is a drawback that it impairs the accuracy of the cooling temperature.

The present invention relates to an improvement of the hot plate cooling device disclosed in Japanese Utility Model Laid-Open No. 60-5709. The problem to be solved by the present invention does not impair the above advantages of the cooling device. An object of the present invention is to provide a hot plate cooling device capable of highly accurate cooling control capable of significantly improving temperature uniformity in both the longitudinal direction and the width direction by eliminating a disturbance factor in cooling by a shield plate.

[0012]

According to the present invention, a plurality of nozzles for injecting cooling water to a conveyed hot plate are arranged above and below a passage plate, and further, the conveyed hot plate and an upper nozzle are arranged. In the cooling device for a hot plate, a shield plate having spray water passage holes corresponding to the arranged upper nozzles is arranged so as to be movable in the plate width direction of the hot plate M. The edge and the peripheral edge of the cooling water passage hole are formed in an upright shape, and a drainage portion for discharging the accumulated water to the outside of the plate system is formed at the edge of the shielding plate.

Further, the shielding plates are arranged in a double upper and lower,
One can be used for cooling control of the widthwise side edge portion of the hot plate, and the other can be used for cooling control of the lengthwise edge portion of the hot plate.

[0014]

[Function] The cooling water shielded by the shield plate is prevented from flowing down onto the hot plate in the passing plate due to the effect of the green edge and the peripheral edge of the shield plate, and the cooling water drops to the cooling unnecessary portion of the hot plate. This can be completely eliminated and the cooling accuracy can be improved.

[0015]

EXAMPLE The present invention will be described below based on an example in which a shield plate is provided in a double structure, which is applied to a cooling device for hot plates rolled in a thick plate rolling line.

FIG. 1 is a view of a cooling device according to an embodiment of the present invention as viewed from the hot plate entrance side.

In the figure, M indicates a hot plate which is conveyed by rolls (R) which are vertically paired in the cooling device body and arranged at a required pitch. The upper and lower surfaces of the hot plate M are connected to upper and lower headers 1 and 2 connected to a water supply source outside the machine, and are sprayed by a large number of upper and lower cooling water jet nozzles 3 and 4 directed to a pass line between rolls. To be cooled.

Reference numeral 6 denotes a first shield plate arranged between the jet nozzle 3 and the second shield plate 5 arranged above the heat plate M for shielding the cooling water in the width direction. Second shield 5
Shields the end face portion in the length direction of the heat plate M arranged below the first shield plate 6.

The first shield plate 6 is provided in a pair with respect to the heat plate M in the width direction of the heat plate M, and is provided so as to be movable in the width direction with respect to the plate width of the heat plate M. In addition to blocking the injection of cooling water to the cooling unnecessary part of the end face portion in the width direction of the hot plate, the width of the shielded area according to the width of the hot plate by the comings and goings of each shielding plate Can be adjusted.

As shown in FIG. 4, the second shielding plate 5 is provided with a jet water passage hole 12 corresponding to the arranged upper nozzles 3 between the conveyed heat plate M and the upper nozzles 3. And
The fluid cylinder 11 can move the hot plate M by a fixed dimension in the plate width direction, and by moving the fixed dimension, cooling water is poured or cut off in the longitudinal direction of the hot plate M.

The second shielding plate 5 has an edge 13 of the shielding plate and a peripheral edge 12 of the cooling water passage hole formed in a vertical green shape, and the collected water is passed to the outside of the plate system at the edge of the shielding plate. Discharge port 1 for discharging
4 was formed. An apron 16 for supporting the weight of the second shield 5 is provided in the lower portion of the second shield plate 5, and cooling water is allowed to pass through a hole provided in the apron 16.

In FIG. 1, reference numeral 15 denotes a shield plate below the heat plate M, which has neither an edge nor a peripheral edge.

2 and 3 show the sectional structures of the first and second shield plates 5 and 6 and the drive mechanism thereof, respectively. FIG. 2 is a view similar to FIG. It is a figure
FIG. 3 shows the structure as seen from the side.

In FIG. 2, the first shield plate 6 for shutting off the cooling water injection at the side edge portion of the upper hot steel plate M is a bearing attached to the drive motor 8 provided in the horizontal frame 7 of the cooling device. The mechanism 9 can be moved back and forth in the plate width direction of the heat plate M by screwing the screwed rod 10 attached to the end surface of the first shield plate 6 into the mechanism 9. As the moving mechanism of the first shield plate 6, in addition to the illustrated chain, chain sprocket, and screw rotating mechanism, a driving mechanism such as a hydraulic motor or an advancing / retreating mechanism by air pressure and hydraulic pressure may be used.

Further, the second shield plate 5 is shown as a shield plate which defines the injection area of the injection cooling water in the longitudinal direction of the heat plate M. The second shielding plate 5 is provided so as to be movable in the plate width direction by a fluid cylinder 11 attached to the horizontal frame 7, and the passage holes 12 of the jet water are formed in accordance with the pitch of the arrangement of the jet nozzles 3. It is provided. This second
As shown in the perspective view of FIG. 4, the shielding plate 5 of FIG. 4 has a standing edge 13 formed on the side edge thereof and on the periphery of the jet water passage hole 12.
The cooling water blocked by both the shielding plate 5 and the first shielding plate 6 does not fall on the hot plate M as falling water. Furthermore, the second shielding plate 5 has a hot-rolled steel plate M
A drainage port 14 for draining water is provided at a position distant from any of the edges, and the cooling water is cut off on the second shielding plate 5 to cool the hot plate M.
The water is not discharged as falling water to the hot plate M and is drained to a position wider than the width direction of the hot plate M.

With the reliable shielding of the jet cooling water, partial shielding can be ensured in the cooling of the hot plate by the jetting of the nozzle such as the laminar flow nozzle, and the hot plate cooling can be controlled.

In the above-mentioned embodiment, an example in which the shield plates 5 and 6 are arranged vertically has been described. For example, in the case of only the controlled cooling of the longitudinal edges of the heat plate M, FIG.
It is sufficiently effective to use only the second shielding plate 5 shown in FIG.

[0028]

According to the present invention, the following effects can be obtained.

(1) The cooling of the hot plate due to the jet of cooling water by a nozzle such as a laminar flow nozzle can be partially blocked with certainty, and cooling control can be reliably performed.

(2) The flowing water on the shielding plate can be drained to a place apart from the cooling area of the hot plate, so that a cooling water return pipe is not required in the cooling device, the facility is simplified, and it is economical.

(3) The tip in the longitudinal direction of the plate as well as the width direction,
The temperature at the tail end can be made uniform, and the material can be made uniform.

(4) The distortion due to the nonuniform temperature of the hot plate is less likely to occur, and the work of post-processing such as leveler and press straightening can be omitted.

(5) The distortion of the roller table is small and the noise of the roller table conveyance is small, which leads to the improvement of the working environment.

[Brief description of drawings]

FIG. 1 shows an outline of an entire cooling device when the present invention is applied to cooling a hot plate in a thick plate manufacturing line.

FIG. 2 shows a structure of a shielding plate according to the present invention and a driving device for horizontally moving the same.

FIG. 3 shows a side view of FIG.

FIG. 4 shows a perspective view of portions of the shielding plates 5 and 6.

[Explanation of symbols]

M Heat Plate R Roller 1, 2 Header 3, 4 Nozzle 5 Second Shielding Plate 6 First Shielding Plate 7 Horizontal Frame 8 Drive Motor 9 Bearing Mechanism 10 Screwed Rod 11 Fluid Cylinder 12 Fluid Water Passage Hole 13 Standing Edge 14 Drainage port 15 Shield plate 16 Apron

Claims (2)

[Claims] 1. A plurality of nozzles for injecting cooling water to a conveyed hot plate are arranged above and below a passage plate, and further arranged between the conveyed hot plate and an upper nozzle. In a cooling device for a hot plate in which a shielding plate provided with a cooling water passage hole corresponding to an upper nozzle is movably arranged, an edge of the shielding plate and a peripheral edge of the cooling water passage hole are formed in a rim shape, Further, the hot plate cooling device has a drain portion for discharging the accumulated water to the outside of the plate system at the edge of the shielding plate. 2. A plurality of nozzles for injecting cooling water onto the conveyed hot plate are arranged above and below the passage plate, and further arranged between the conveyed hot plate and the upper nozzle. In a hot plate cooling device in which a shield plate with cooling water passage holes corresponding to nozzles is movably arranged, double shield plates are provided, and one of them is for cooling control of the side edge portion in the width direction of the heat plate. And the other is used for cooling control of the edge portion in the lengthwise direction of the hot plate, and the shielding plate forms the edge and the peripheral edge of the cooling water passage hole in a standing shape, and the shielding plate Cooling device for hot plates, in which the drainage part for discharging the accumulated water to the outside of the plate system is formed at the edge of the hot plate.