JP3762536B2 - Hot rolled steel sheet cooling device - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a cooling device that cools a hot-rolled steel sheet from below.
[0002]
[Prior art]
As an example of a hot-rolled steel sheet, a hot strip by continuous hot rolling will be described as an example. Usually, in the rolling line, a slab is charged into a heating furnace, heated to a predetermined temperature, extracted, and then subjected to rough rolling and finish rolling. After rolling to a predetermined size, a roller table called a run-out table is cooled to a predetermined temperature by water cooling from above and below, and then wound into a coil by a winder.
[0003]
Water cooling on the roller table is performed by a cooling device consisting of a header arranged above and below the roller table along the roll axis direction and a number of nozzles attached to the header at regular intervals. Since the temperature of the edge portion of the strip is usually low, if the edge portion is water-cooled in the same manner as other portions, the quality of the product is deteriorated due to overcooling and causing cracks.
[0004]
As a countermeasure for this problem, there is a method in which a nozzle is provided with a valve, the valve of the nozzle that cools the edge portion is switched OFF, and water injection from the valve is stopped, but when one part of the nozzle is turned OFF, The amount of jets from other nozzles becomes larger than necessary, resulting in supercooling.
There has also been proposed a method of blocking the cooling water supplied to the edge portion without increasing the supply of cooling water to the portion other than the edge.
[0005]
Japanese Utility Model Publication No. 62-35524 discloses a method in which the cooling water supplied to the edge portion is blocked by a bucket arranged so as to be able to advance and retreat in the plate width direction, and Japanese Patent Application Laid-Open No. 1-178309 discloses a V-shaped and an inverted V-shaped method. A method is disclosed in which a drainer is disposed so as to be capable of moving back and forth in the direction of travel of the hot strip to shut off the cooling water supplied to the edge portion and / or the center portion.
[0006]
[Problems to be solved by the invention]
Any of the above-described methods for blocking the cooling water supplied to the edge portion blocks the cooling water supplied to the upper side of the hot-rolled steel sheet, and it is not possible to simply block the cooling water supplied to the upper side. The edge portion is sufficiently cooled by the cooling water supplied from the lower side, and there is a risk of cracking, and material unevenness in the plate width direction occurs. In particular, such a problem is likely to occur in a thin object having a high cooling effect.
[0007]
In order to solve the above problem, the present invention is intended to block the cooling water supplied from the lower side to the edge portion, but the nozzle provided for cooling the hot-rolled steel plate from the lower side is Since it protrudes upward from the header and extends between the rolls, the above-described known method cannot be used as it is because of space and configuration.
[0008]
An object of this invention is to provide the cooling device which can interrupt | block the cooling water supplied from the lower side to an edge part.
[0009]
[Means for solving problems]
The present invention includes a header arranged along a roll axis direction under a roller table, a nozzle projecting upward from the header, extending between the rolls, extending upward between the rolls, and cooling injected from the nozzle to the upper end. An arm with a shielding part protruding from the side projecting to the side, a arm connected to the arm under the roller table, and a position where the shielding part is located above the nozzle to shut off the cooling water. In a hot-rolled steel sheet cooling apparatus comprising an operating device that operates an arm so as to be switched to a position that does not hinder the supply of cooling water to the rolled steel sheet, the arm is pivotally supported by a pivot disposed between rolls. Alternatively, it is supported by the nozzle .
[0010]
The actuating device of the present invention is provided individually for each arm, or is provided for a plurality of arms so that each arm is controlled by one actuating device. If an operating device is provided for each arm as in the former so that the shielding part can be controlled individually, finer cooling control of the edge part becomes possible, and the material in the sheet width direction of the steel sheet can be made uniform. . On the other hand, the latter device that controls a plurality of arms with a single actuating device has a simple structure and does not take up space, and is suitable for installation in a narrow space under the roller table. In a more preferred aspect of the latter actuating device, the actuating device is arranged along the direction of travel of the hot-rolled steel sheet under the roller table, and an operation member capable of moving back and forth connecting each arm, and an operation device for moving the operation member back and forth. Consists of.
Any of the above operating devices may be any device or mechanism that can operate the arm so that the shielding portion can be switched between a position where the shielding portion blocks the cooling water and a position where the supply of the cooling water is not hindered. Regardless, for example, an air cylinder, a pinion / rack mechanism, etc., or an apparatus including these and an operation member can be cited.
The arm in the present invention is preferably pivotally attached to a pivot or a nozzle having a lower end pivotally attached to the actuator and an intermediate portion disposed between the rolls. The advantages of this are as follows.
[0011]
The distance between the rolls is the narrowest between the roll axes. The closer the shaft fulcrum of the middle part of the arm is to the line connecting the roll axes, the smaller the amount of movement of the arm between the roll axes. Position, in other words, the pitch of the roll can be narrowed, so in the case of a thin plate, the tip hangs down and easily hits the roll during conveyance.However, by reducing the pitch between the rolls, even a thin steel plate can hit the roll. It can be transported without hanging, and it is possible to roll thin steel plates. The arm has advantages such as that the support state and movement are stabilized by pivotally attaching the middle portion and pivotally attaching the lower end to the operation member and supporting it at two points.
[0012]
Further, by supporting the arm on the nozzle, the structure is relatively simple and there is an advantage that it does not take up space.
There are roller tables of a type in which rolls of a certain length are arranged side by side, and those in which disk-shaped rolls are attached at regular intervals and adjacent rolls are arranged alternately. According to the roller table in which the latter disk-shaped rolls are arranged alternately, the pitch between the rolls can be narrowed, and a thin plate can be conveyed. The cooling device of the present invention can also be applied to a roller table in which such disc-shaped rolls are arranged alternately to reduce the pitch between the rolls.
The cooling device of the present invention is preferably used in combination with a cooling device equipped with a known shut-off device that cools the hot-rolled steel plate from the upper side and shuts off the cooling water to the edge portion, so that the edge portion that is likely to be generated particularly in a thin plate is used. Overcooling can be prevented and cracking of the edge portion can be prevented. Therefore, it is possible to manufacture a thin steel plate having a thin plate thickness, which has been difficult in the past, by hot rolling, saving a cold rolling operation and an annealing operation performed in the next process, and saving energy.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a roller table in which rolls 1 of a certain length are arranged side by side and a cooling device 2 for supplying cooling water to the hot strip from the lower side is arranged between the rolls 1. FIG. 2, the cooling device 2 is disposed between the rolls along the roll axis direction, and has a header 4 to which cooling water is supplied from the main pipe 3, and protrudes upward from the header 4 at regular intervals. The nozzle 5 provided between the rolls, the operation plate 6 as an operation member disposed at both edge portions so as to be movable in a direction perpendicular to the roll axis (advancing direction of the hot strip), and the operation plate 6 are moved forward and backward. An air cylinder 7 as an operating device to be operated, an intermediate portion pivotally attached to the nozzle 5, a lower end pivotally attached to the operation plate 6, and an upper portion bent in an arc shape, and an arm projecting laterally from the tip of the arm With the shield 9 provided When the shielding part 9 is sprayed with cooling water from the nozzle 5 to the hot strip 10 at the position of the solid line shown in FIG. 3, and when the operation plate 6 is moved by a certain amount in the direction of the one-dot chain line in FIG. The arm 8 is rotated counterclockwise in the drawing to the position of the one-dot chain line, and the cooling water ejected from the nozzle 5 by the shielding portion 9 is blocked. In FIG. 1, reference numeral 11 denotes a motor that rotationally drives the roll 1.
[0014]
Although not shown in FIG. 2, a cooling device for cooling the hot strip from the upper side with cooling water ejected from the nozzle is provided on the roller table, and this device blocks the cooling water supplied to the edge portion. It has a known shut-off device that can.
According to this device, among the cooling water that cools the hot strip from the top and bottom, the cooling water that cools the edge part can be cut off at the top and bottom, preventing overcooling of the edge part, which is particularly likely to occur with thin plates, and cracking the edge part. Can be prevented. Therefore, as described above, it is possible to manufacture a thin plate by hot rolling, and it is possible to save a process and save energy in a cold rolling operation and an annealing operation in the next process.
[0015]
FIG. 4 shows a roller table in which the disk rolls 13 mounted at regular intervals are arranged alternately, the roll driving motors 14 are provided alternately on the left and right, and the cooling device 15 is disposed between the disk rolls. As shown in FIG. 5, the cooling device 15 includes a nozzle 19 that protrudes from the header 16 and extends between the disk roll 13 and the roll shaft 18 and a shielding portion 21, as in the cooling device 2 shown in FIG. 2. When the arm 22 comprising the arm 22 and moving the operation plate 23 back and forth is turned, the position can be switched between a position for blocking the cooling water ejected from the nozzle 19 and a position for spraying the cooling water to the hot strip 10. Yes.
[0016]
According to the present apparatus, the present invention can also be applied to a roller table having a narrow roll pitch in which disk rolls are alternately arranged as described above.
Note that this device also has a cooling device including a known shut-off device that cools the hot strip from the upper side and shuts off the cooling water to the edge portion, as in the above-described device.
[0017]
【The invention's effect】
According to the first aspect of the present invention, the cooling water can be shut off by being applied to the edge portion of the hot-rolled steel sheet from the lower side than the nozzle that protrudes upward from the header and extends between the rolls, thereby preventing overcooling of the edge portion. It can be used in combination with a device that shuts off the cooling water supply that cools the edge from above, preventing overcooling of the edge, and cracking of thin steel plates that could not be rolled due to cracking due to overcooling. rolling also becomes possible, by thin of hot rolling stage with a possible saving process and energy conservation in the next step, it is possible to equalize the plate width direction of the material of the steel sheet, and also in the narrow space between the rolls The arm can be rotated to switch the shielding portion between the blocking position and the retracted position, in other words, it can be applied to a roller table with a narrow pitch between rolls. Also enables conveyance of a plate, in addition to rolling is possible, the arms supporting state and motion to be supported at two points is stable.
[0019]
According to the second aspect of the present invention, the present invention can be applied to a roller table that has a simple structure, does not take up space, and has a narrow pitch between rolls.
According to the third aspect of the present invention, the structure of the operating device for operating the arm is simple, and it is suitable for installation in a narrow space under the roller table without taking up space.
According to invention of Claim 4, it can apply also to the roller table which can narrow the pitch between rolls by arrange | positioning a disk roller alternately, and conveyance and rolling of a thinner thing are attained.
[Brief description of the drawings]
FIG. 1 is a plan view of a roller table provided with a cooling device according to the present invention.
FIG. 2 is a front view of the cooling device shown in FIG.
FIG. 3 is an enlarged view of a cooling device.
FIG. 4 is a plan view showing another aspect of a roller table provided with a cooling device according to the present invention.
FIG. 5 is a front view of the cooling device shown in FIG. 4;
[Explanation of symbols]
1 .. Roll 2.. Cooling device 3. Main pipe 4, 16 .. Header 5, 19 .. Nozzle 6, 23 .. Operation plate (operation member)
7. Air cylinder (operating device)
8, 22 ·· Arms 9 and 21 · · Shielding portion 11, 14 · · Motor 13 · · Disc roll 15 · · Cooling device 18 · · Roll shaft

Claims (4)

A header arranged along the roll axis direction under the roller table, a nozzle projecting upward from the header, extending between the rolls, extending upward between the rolls, and blocking cooling water sprayed from the nozzle at the upper end An arm with a shielding part projecting sideways, an arm connected to the arm under the roller table, a position where the shielding part is located above the nozzle and shuts off the cooling water, and retracts from the position to the hot-rolled steel sheet In a hot-rolled steel sheet cooling device comprising an operating device that operates an arm so as to be switched to a position that does not hinder the supply of cooling water, the arm of the hot-rolled steel plate that is pivotally supported by a pivot arranged between rolls. Cooling device . A header arranged along the roll axis direction under the roller table, a nozzle projecting upward from the header, extending between the rolls, extending upward between the rolls, and blocking cooling water sprayed from the nozzle at the upper end An arm with a shielding part projecting sideways, an arm connected to the arm under the roller table, a position where the shielding part is located above the nozzle and shuts off the cooling water, and retracts from the position to the hot-rolled steel sheet A hot-rolled steel sheet cooling apparatus comprising an operating device that operates an arm so as to be switched to a position that does not hinder the supply of cooling water, wherein the arm is pivotally supported by a nozzle . 3. The heat according to claim 1, wherein the actuating device is disposed under the roller table along the traveling direction of the hot-rolled steel plate, and includes an operation member capable of moving back and forth connecting each arm and an operation device for moving the operation member forward and backward. A device for cooling rolled steel sheets. Roller tables, cooling device for a hot-rolled steel sheet according In any one of claims 1 to 3 rolls adjacent mounting a disc-shaped roll at regular intervals a roller table arranged to be staggered.

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