JPH0239604Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a steel plate lower surface cooling device, and more specifically, after finish rolling or hot leveling of a steel plate,
In a system in which a steel plate is conveyed on a table roller and its lower surface is cooled by a cooling water flow from a spray header nozzle, the cooling rate range of the steel plate can be reasonably widened, and the lower surface of the steel plate can be cooled evenly. Another purpose is to simplify the structure, reduce costs, and eliminate the risk of accidents.

In the steel plate manufacturing process, when a forced cooling device is installed in existing equipment to control and cool the steel plate while conveying it on table rollers after finish rolling or hot leveling, there is a space restriction due to the layout.

On the other hand, in order to improve the material quality by implementing controlled cooling, the steel plate cooling rate control range of the cooling equipment is 25mm thick, and the cooling range is 3℃/3℃ from 800℃ to 500℃. A wide range of sec to 30°C/sec is required.

In such a cooling method that controls cooling rates over a wide range, if an upper pipe lamina header and a lower spray header are used, a single type of nozzle would require control over a wide range of pressures, making it difficult to implement. It's on.

In particular, the lower splay header requires a header to be placed between the table rollers, and has more space constraints than the upper pipe lamina header.

An example of a steel plate cooling device will be described with reference to the drawings.

In Fig. 1, 1 is an upper pipe lamina header, which is composed of a pipe lamina header 2 for weak cooling and a pipe lamina header 3 for strong cooling, and each header has an inverted U-shaped pipe lamina nozzle 2A, 3A. is provided.

Reference numeral 4 denotes a lower spray header, which is composed of a spray header 5 for weak cooling and a spray header 6 for strong cooling, each of which is provided with nozzles 5A and 6A.

7 is a table roller, above which arrow A is shown.
A steel plate 8 to be cooled is passed in the direction, and an upper pipe lamina header 1 and a base spray header 4 are provided vertically corresponding to the steel plate 8 to be cooled.

Therefore, in the lower spray header 4 of the apparatus shown in FIG.
It is desirable to provide a plurality of rows of A and 6A at intervals in the sheet passing direction A in order to disperse the cooling water over the entire lower surface of the steel plate 8 to be cooled.

However, since the interval between the table rollers 7 has already been standardized, there is a limit to the number of table rollers arranged.

Although it is theoretically possible to do this by using curved piping, etc., it is not only difficult to achieve precision in manufacturing and construction, but also increases economic costs, so it has remained beyond the realm of desktop theory. .

Therefore, in view of the above-mentioned circumstances, the applicant of the present invention has already proposed an improvement example of the lower splay header in Utility Model Application No. 58-4120 and Utility Model Application No. 59-148117.

In this improved example, as shown in FIG. 2, the cooling water passage 9 inside the lower spray header 4, which is disposed between the table rollers 7 that convey the steel plate 8 to be cooled, is divided into two upper and lower passages by a partition plate 9A. , the upper passage is a strong cooling passage 10, and the lower passage is a weak cooling passage 11.
Cooling water is supplied to each passage 10, 11 via a cooling water supply pipe 12 or the like.

In addition, strong cooling nozzles 6 communicating with the strong cooling passage 10 are provided before and after the lower spray header 4 in the sheet passing direction A.
A and weak cooling nozzles 5A communicating with the weak cooling passage 11 via the communication pipe 13 are arranged in multiple rows in front and behind the plate passing direction A, respectively.

In this improved example, the number of rows of nozzles 5A and 6A in the lower spray header 4 can be increased compared to that in FIG. Since communication is provided through a communicating pipe 13, the structure is complicated and the cost is high, and there is also the problem that the communicating pipe 13 is prone to cracking due to thermal distortion, which can lead to accidents. Ta.

The present invention has table rollers arranged in parallel horizontally at intervals in the threading direction of the steel plate and perpendicular to the threading direction, and the lower surface of the steel plate conveyed in the threading direction on the table rollers. In order to solve the above-mentioned problems in a steel sheet underside cooling device equipped with a spray header that is cooled by a cooling water flow from a nozzle, the following technical measures have been taken.

That is, in the present invention, a spray header having a nozzle mounting surface on the upper part is provided between the table rollers, and a front passage in the sheet passing direction and a opposite passage are respectively independently partitioned in the spray header across the sheet passing direction. A cooling water passage consisting of three passages, a rear passage in the sheet passing direction and an intermediate passage between both passages, is provided, and among the cooling water passages, the intermediate passage or the front and rear passages are used as strong cooling passages, and the other passages are is a weak cooling passage, and a strong cooling nozzle that communicates with the cooling passage and a weak cooling nozzle that communicates with the weak cooling passage are arranged on the nozzle mounting surface of the spray header in opposite communication with the front part in the sheet passing direction. A strong cooling nozzle and a weak cooling nozzle are provided at the rear in the plate direction and spaced apart from each other in the width direction of the steel plate, and correspond to the central part of the steel plate in the width direction to uniformly distribute the cooling water flow to the lower surface of the steel plate on the table roller. The strong cooling nozzles are arranged such that the cooling water jet direction with the nozzle is inclined upward in the forward direction and upward inclined in the backward direction in the sheet passing direction, and is vertical when viewed from the sheet passing direction, and corresponds to both sides of the central portion in the width direction of the steel sheet. The cooling water jetting directions of the cooling water nozzle and the weak cooling nozzle are provided with an upward slope in the forward direction and an upward slope in the rear in the sheet threading direction, and an upward slope outward in the width direction of the steel sheet when viewed from the sheet threading direction. It is something to do.

Hereinafter, one embodiment of the present invention will be described based on the drawings of FIGS. 3 to 10.

FIG. 3 shows an online controlled cooling facility, in which after finish rolling or hot leveling the steel plate 15,
While the steel plate 15 is conveyed in the direction of arrow A on the table roller 16, its upper and lower surfaces are cooled by a cooling water flow.

The table rollers 16 are arranged in parallel with an interval in the sheet passing direction A in a horizontal direction perpendicular to the sheet passing direction A, with the roller axis direction being perpendicular to the sheet passing direction A.
A lower spray header 17 is arranged between 6 and
Moreover, above it is a pipe lamina header 1 for weak cooling.
8, and further above these, strong cooling pipe lamina headers 19 are arranged in parallel at intervals in the sheet passing direction A, and the upper and lower surfaces of the steel plate 15 are cooled by a cooling water flow. Note that each pipe lamina header 18 for weak cooling is provided with a pipe lamina nozzle 20, and each pipe lamina header 19 for strong cooling is provided with a pipe lamina nozzle 21.
is provided.

As shown in FIGS. 6 and 7, the spray header 17 has a hollow interior (rectangular box shape), has a nozzle mounting surface 26 at the top, and has header centers C and L.
is arranged between the table rollers 16, with the distance between the roller axes of the table rollers 16 being approximately at the center.

By providing the partition plate 23 in the spray header 17 across the sheet passing direction A, the sixth
As shown in FIGS. 7 and 7, the cooling water passage 22 is provided with three passages: an intermediate passage 24 and front and rear passages 25, which are each independently partitioned.

As shown in FIG. 11, "front" refers to the direction A in which the steel plate 15 is threaded, "rear" or "rear" refers to the direction opposite to the threading direction, and "vertical direction" refers to the direction perpendicular to the steel plate face plate. It is used uniformly.

Of the cooling water passages 22, the intermediate passage 24 is twice the volume of each passage of the rear passage 25 (the volume of each passage of the front and rear passages 25 is 1/2 of the volume of the intermediate passage 24). In the embodiment, the intermediate passage 24 is used as a strong cooling passage, and the front and rear passages 25 are used as weak cooling passages.

A strong cooling nozzle 27 is provided on the nozzle mounting surface 26 and communicates with the strong cooling passage (in the illustrated example, the intermediate passage 24).
are provided at the front and rear of the header centers C and L, respectively, and a weak cooling nozzle 28 is provided on the nozzle mounting surface 26 and communicates with the weak cooling passage (in the illustrated example, the front and rear passages 25). ing.

In order to uniformly distribute the cooling water flow to the lower surface of the steel plate 15 being conveyed in the sheet passing direction A on the table roller 16, the cooling water jet directions 31 and 32 of the strong cooling nozzle 27 and the weak cooling nozzle 28 are passed through. The plate direction A is inclined upwardly at the front and upwardly at the rear.

To explain more specifically, nozzle mounting holes 29 and 30 are formed in the nozzle mounting surface 26, and the mounting hole 29 is formed in the small diameter portion 29 on the lower side as shown in FIG.
a and a large diameter part 29b on the upper side (the same applies to the mounting hole 30), and each nozzle 27, 28 is screwed to a small diameter part 29a on the lower side.

Reference numeral 33 denotes a spray nozzle protector, which is provided on the upper surface of the nozzle mounting surface 26 in a lateral direction perpendicular to the sheet passing direction A (roller axis length direction, or the width direction of the steel plate 15), a large number of them are arranged in parallel at intervals.

Providing this protector 33 is advantageous because it performs the following actions.

That is, the steel plate 15 that is rolled or hot-levelled and conveyed is not always conveyed in a flat state. For example, if the front edge of the steel plate 15 in the sheet passing direction is bent downward, the steel plate 15 may not be conveyed while being conveyed. may cause vertical movement, but even in this case,
Each nozzle 27, 28 is protected by a protector 33 so that it does not come into contact with the steel plate 15 and is not damaged.

Therefore, when the steel plate 15 is flat and does not collide with the nozzles 27 and 28 even if it moves up and down during conveyance, the protector 33 may not necessarily be necessary.

On the nozzle mounting surface 26 between the spray nozzle protectors 33 arranged in parallel in the roller axial direction, a fourth
In the figure, four strong cooling nozzles 27 are indicated by ○ marks.
and the four weak cooling nozzles 28 indicated by □ marks, totaling 8.
Of the nozzles 27 and 28, in FIG. 6, which is shown in cross section EE in FIG.
Front nozzle 27 of the two rear strong cooling nozzles 27
In the case of the rear nozzle 27, the cooling water jetting direction 31 is tilted forward upward in the sheet passing direction A, and in the case of the rear nozzle 27, the cooling water jetting direction 31 is tilted backward and upward in the sheet passing direction A, and the inclination angle is are considered to be the same. Also,
Among the weak cooling nozzles 28 communicating with each of the front and rear passages 25, the nozzle 28 of the front passage 25 has its cooling water ejection direction 32 inclined backward in the sheet passing direction A, and the nozzle 28 of the rear passage 25 The cooling water jetting direction 32 is inclined upward in front of the sheet passing direction A, and the angle of inclination is the same.

Furthermore, in FIG. 7 shown in the cross section taken along line B-B in FIG. In the case of the rear nozzle 27, the cooling water jetting direction 31 is tilted upward in the forward direction A (however, the inclination angle is gentler than that of the nozzle 27 in FIG. 6), and in the direction A,
The angles of inclination are the same. Also,
Among the weak cooling nozzles 28 communicating with each of the front and rear passages 25, the front nozzle 28 has a cooling water jetting direction 32 inclined upwardly forward in the sheet passing direction A,
The cooling water jetting direction 32 of the rear nozzle 28 is inclined rearward and upward in the sheet passing direction A.

As described above, the spray nozzle protector 33
A total of 8 on each nozzle mounting surface 26 between
Strong and weak cooling nozzles 27 and 28 are provided to uniformly cool the lower surface of the steel plate 15.

Further, a strong cooling nozzle 27 on the nozzle mounting surface 26,
In addition to the slope described above, the weak cooling nozzle 28 has the following slope, and the corresponding mounting holes 29, 3
It is attached to 0.

That is, when viewed from the sheet passing direction A (in the above, the angle viewed from the lateral direction orthogonal to the sheet passing direction A), the fifth
In the figure, a strong cooling nozzle 27 and a weak cooling nozzle 28 are installed in the mounting holes 29' and 30', respectively.
In all eight of them, the direction in which the cooling water is ejected is perpendicular to the lower surface of the steel plate 15.

In other words, the nozzles 27 and 28 installed in the mounting holes 29' and 30' are for cooling the central portion H in the sheet width direction of the steel sheet 15 conveyed in the sheet passing direction A in FIG. Left side of steel plate 15 in the plate width direction
The nozzles 27 and 28 for cooling H1 and the right side H2, respectively, and the nozzles 27 and 28 for cooling the left side H1, jet cooling water in an upwardly inclined direction outward in the left direction of the sheet width perpendicular to the sheet passing direction A. The cooling water on the right side H2 is spouted in an upwardly inclined direction outward in the right direction of the sheet width, which is perpendicular to the sheet passing direction A.
Each nozzle 2 for cooling left side H1 and right side H2
The inclination angles 7 and 28 are the same.

That is, the strong cooling nozzle that communicates with the cooling passage and the weak cooling nozzle that communicates with the weak cooling passage are spaced apart in the width direction of the steel plate at the front part in the sheet passing direction and the rear part in the opposite direction. Further, in order to uniformly distribute the cooling water flow to the lower surface of the steel plate on the table roller, the cooling water jet direction of the strong cooling nozzle and the weak cooling nozzle corresponding to the central portion in the width direction of the steel plate is as follows. Cooling nozzles for strong cooling and nozzles for weak cooling are provided with a front upward slope and a rearward upward slope in the sheet threading direction and are vertical when viewed from the sheet threading direction, and correspond to both sides of the central portion in the width direction of the steel sheet. The water jetting direction is provided as an upward slope in the front direction and an upward slope in the rear direction in the sheet threading direction, and an upward slope outward in the width direction of the steel sheet when viewed from the sheet threading direction.

In addition, in Figures 5, 9, and 10,
Reference numerals 34, 35, 36, and 37 indicate cut-off portions formed in the spray nozzle protector 33, which are provided so as not to obstruct the cooling water spout from each nozzle 27, 28.

In addition, in the illustrated embodiment described above, the cooling water passage 2
Among the three passages 24, 25, and 25 constituting the 2, the intermediate passage 24 is used as a strong cooling passage, and the front and rear passages 2
The two passages 5 and 25 are used as weak cooling passages, but the intermediate passage 24 is used as a weak cooling passage, and the front and rear passages 25,
25 may be used as a weak cooling passage.

The present invention is as described above, and a spray header having a nozzle mounting surface on the upper part is provided between the table rollers, and inside the spray header, there is an intermediate passage independently partitioned across the sheet passing direction, a front passage, and a front passage.
Since there is a cooling water passage consisting of three in the rear passage, the strong cooling nozzle and each weak cooling nozzle can be communicated with each other without using communication pipes in each passage, simplifying the structure. In addition to reducing costs, it is also possible to prevent accidents such as cracks in the communicating pipe due to thermal distortion.

Among the cooling water passages, the intermediate passage or the front and rear passages are used as strong cooling passages, and the other passages are used as weak cooling passages. Since a weak cooling nozzle is provided that communicates with the cooling passage, the spray header can have multiple nozzle rows for strong cooling and weak cooling in the sheet passing direction and in the horizontal direction perpendicular to the sheet passing direction, thereby increasing the cooling rate. The range can be expanded easily.

In addition, in order to evenly distribute the cooling water flow to the lower surface of the steel plate, the cooling water jet directions of the strong cooling nozzle and the weak cooling nozzle are tilted upward in the front direction and upward in the rear direction in the sheet threading direction. Whether the cooling nozzle and the weak cooling nozzle are used independently or in parallel, cooling water can be uniformly injected into a predetermined portion of the lower surface of the steel plate, and uniform cooling can be achieved. The present invention has the above advantages and is of great practical benefit.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a part of conventional example 1, FIG. 2 is a longitudinal sectional view showing a part of conventional example 2, and FIGS. 3 to 10 show an embodiment of the present invention. Fig. 3 is a schematic side view of the entire spray header, Fig. 4 is a plan view of the spray header, Fig. 5 is a plan view of the spray header with the nozzle removed at the lateral center, and Fig. 6 is Fig. 5E.
7 is a sectional view taken along line B-B of FIG. 5, FIG. 8 is a partially enlarged view of FIG. 6, and each of FIGS. 11 is an explanatory perspective view for clarifying the threading direction of the steel plate and the like. 15... Steel plate, 17... Lower spray header,
22... Cooling water passage, 24, 25... Passage for strong cooling, weak cooling, 26... Nozzle mounting surface, 27, 28...
...Spray nozzles for strong cooling and weak cooling, 31, 32...
...Cooling water jet direction.

Claims (1)

[Claims for Utility Model Registration] Table rollers are arranged in parallel horizontally at intervals in the passing direction of the steel plate and perpendicular to the passing direction, and the steel plate is conveyed in the passing direction on the table rollers. In a steel plate lower surface cooling device equipped with a spray header that cools the lower surface of a steel plate with a cooling water flow from a nozzle, a spray header having a nozzle mounting surface on the upper part is provided between table rollers, and inside the spray header, a horizontal direction in the sheet passing direction is installed. There is provided a cooling water passage consisting of three independently partitioned front passages in the plate passing direction, a rear passage in the opposite plate passing direction, and an intermediate passage between both passages, and among the cooling water passages, The intermediate passage or the front and rear passages are used as strong cooling passages, and the other passages are used as weak cooling passages, and a strong cooling nozzle communicating with the cooling passage and the weak cooling nozzle are provided on the nozzle mounting surface of the spray header. Weak cooling nozzles communicating with the passage are provided at the front in the sheet passing direction and at the rear in the opposite direction, with intervals in the width direction of the steel sheet, so that the cooling water flow is evenly distributed to the lower surface of the steel sheet on the table roller. In order to disperse the cooling water, the cooling water jet direction from the strong cooling nozzle and the weak cooling nozzle corresponding to the central part in the width direction of the steel plate is set to be inclined upward in the forward direction and upward in the rear direction in the sheet threading direction, and vertical when viewed from the sheet threading direction. The cooling water jetting direction of the strong cooling nozzle and the weak cooling nozzle corresponding to both sides of the central portion in the width direction of the steel plate is set to be upwardly inclined forward and upwardly backward in the sheet threading direction, and from the sheet threading direction. A steel plate lower surface cooling device characterized in that the steel plate lower surface cooling device is provided as an upwardly inclined outward part in the width direction of the steel plate.