JPS61295326A - Cooler for steel sheet - Google Patents

Abstract

PURPOSE:To provide a water jet type hot steel sheet cooler which can increase cooling capacity and can uniformly heat the hot steel sheet in the transverse direction as well by specifically constituting plural pairs of water jet nozzles provided to face each other by vertically sandwiching the steel sheet therebetween. CONSTITUTION:Plural sets of two pieces a set of the slit-like water jet nozzles 5 inclined in the direction where the nozzles face each other atop the hot steel sheet 1 progressing in a direction (d) on rolls 4... arranged in parallel within the same plane are provided above the steel sheet 1. The nozzles 6 of the same constitution are also disposed to face each other below the sheet 1. A partition plate 8 is spanned between a set of the nozzles 6 (likewise with 5) by bringing the ends thereof into contact with the nozzle edges. The plate 8 has a slit-like aperture extending in the transverse direction of the sheet 1 at approximately the central part along the direction (d) and plural baffle plates 12 extending in the direction (d) on the surface. Then the cooling water is gushed from the nozzles 5, 6 and collides against the sheet 1, thereby cooling the sheet. The cooling water is held in the spaces enclosed of the jets thereof and the plates 7, 8 and the flow in the transverse direction of the sheet 1 is prohibited by the plates 11, 12. The cooling water flows in parallel with the direction (d) while cooling the sheet 1 and is discharged from the apertures 9, 10.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application> The present invention relates to a strip cooling device that is incorporated into equipment such as a heat treatment line or a rolling line for metal strips such as hot steel plates.

<Prior Art> A water jet cooling device is generally employed as a device for cooling metal strips such as hot steel sheets on lines for heat treatment, rolling, etc. As shown in FIG. 3, which shows an example of a conventional water jet type hot steel plate cooling system, a hot steel plate 1 is transported over a large number of mutually parallel rolls z arranged in the same plane at predetermined intervals. , the hot steel plate 1 is cooled by cooling water injected from a plurality of pairs of water jet nozzles 3 and 4 that are disposed vertically and facing each other.

<Problems to be Solved by the Invention> In the conventional strip cooling device shown in FIG. 3, various problems occur because the cooling patterns on the upper and lower surfaces of the hot steel plate 1 are different.

That is, after the upper nozzle 3 collides with the top surface of the hot steel plate 1, the cooling water from the upper nozzle 3 does not cool only the vicinity of the collision part, but also cools the hot steel plate 1.
This flow also cools the entire upper surface of the hot steel plate 1. On the other hand, after the cooling water from the lower nozzle 4 collides with the lower surface of the hot steel plate 1, it immediately hits the hot steel plate 1.
It drips from the bottom surface of the cylinder and locally cools only the vicinity of the collision area. This causes an imbalance in cooling time and cooling area on the upper and lower surfaces of the hot steel plate 1.

Therefore, in the conventional apparatus, the amount of cooling water in the upper and lower nozzles 3.degree. 4 was adjusted so that the average cooling capacity for the upper surface side and the lower surface side of the hot steel plate 1 was the same. In other words, the cooling capacity of the nozzle 4 by the jet impinging on the bottom surface of the hot steel plate 1 is the sum of the cooling capacity of the nozzle 3 by the impinging jet against the top surface of the hot steel plate 1 and the cooling capacity of the cooling water flowing over the top surface of the hot steel plate 1 after the collision. Heat steel plate 1 so that it is equal to
This reduces the flow rate of the cooling water from the nozzle 3 toward the upper surface side, and the result is that the cooling by the cooling water flowing over the upper surface of the hot steel plate 1 after the collision is not actively utilized. Moreover, the amount of cooling water ejected from these nozzles 3.4 differs slightly depending on the processing conditions of the hot steel plate 1, and not only requires extremely complicated and difficult adjustment in actual operation, but also causes local inconvenience. This results in repeated uniform cooling, which causes problems such as non-uniformity and deformation of the material of the hot steel plate 1.

Furthermore, as shown in FIG. 4, which shows the flow of cooling water on the top surface of the hot steel plate 1 shown in FIG. The water flows on the upper surface of the steel plate 1, but the water flows from adjacent nozzles 3 interfere with each other and flow in the width direction of the plate (in the vertical direction in FIG. 4), and eventually flows down from the side edges of the hot steel plate 1. Due to this flow of cooling water in the plate width direction, the cooling heat load in the plate width direction on the upper surface of the hot steel plate 1 is not constant, and the heat load near the side edges of the hot steel plate 1 becomes high. This uneven cooling also causes temperature distribution in the width direction of the hot steel plate 1, causing deformation of the hot steel plate 1 and non-uniformity of the material.

SUMMARY OF THE INVENTION An object of the present invention is to provide a strip cooling device that can solve the problems of the conventional strip cooling device as described above, increase the cooling capacity, and perform uniform cooling in the width direction of the strip. do.

Means for Solving the Problems> The strip cooling device of the present invention is provided with a plurality of sets arranged with strips sandwiched between them, and which are inclined in the forward and backward direction of movement of the strips so as to face the surface of the strips and to face each other. a set of two slit-shaped nozzles, each set of slit-shaped nozzles being stretched between each set, and having an opening approximately at the center along the traveling direction of the strip plate; A partition plate and
A plurality of baffle plates are provided that protrude from the surfaces of these partition plates and extend in the direction in which the strips travel.

Effect〉 A pair of slit-shaped nozzles facing each other and slanted form two slit-shaped cooling water jets facing each other, and the strip plate is cooled by the two jets, and the cooling water after colliding with the strip plate is be prevented from flowing out of the collision range.

Further, the cooling water after the collision is held near the strip by the partition plate, and this cooling water is caused to flow parallel to the traveling direction of the strip by the baffle plate and is discharged from the opening in the center of the partition.

Embodiment As shown in FIG. 1, which shows a cross-sectional structure of an embodiment of a strip cooling device according to the present invention, a plurality of rolls 2 arranged in parallel on the same plane at predetermined intervals are shown in FIG. A plurality of sets of two slit-shaped water jet nozzles 5 are provided above the hot steel plate 1 that advances in the middle and left direction, and are inclined in directions facing each other with respect to the upper surface of the hot steel plate 1 (B). Similarly, below the hot steel plate 1, a plurality of sets of two slit-shaped water jet nozzles 6 are provided which are inclined in directions facing each other with respect to the lower surface of the hot steel plate.

These slit-shaped water jet nozzles 5 and 61 have the same construction, and the angle of inclination α of these with respect to the perpendicular to the hot steel plate 1 is set to Oo<α<90°.

The second figure representing the appearance of the slit-shaped water jet nozzle 6 of -m
As shown in the figure, - a set of slit anti-water jet nozzles 6
A partition plate 8 is stretched between the nozzles with its ends touching the nozzle edges, and a partition plate 7 is similarly stretched between the pair of slit-shaped water jet nozzles 5. A slit-shaped opening 1o extending in the plate width direction is formed in the partition plate 8 at approximately the center along the traveling direction of the hot steel plate 1. A plurality of parallel baffle plates 12 are attached. The structure of these partition plates 8 is the same as that of the partition plate 7.

Therefore, the cooling water is ejected from the slit-shaped water jet nozzles 5 and 6, becomes a jet stream, and collides with the hot steel plate 1 to cool it. After the collision, the cooling water flows between its own jet and the partition plates 7, 8.
and hot steel plate 1, and the flow in the plate width direction is blocked by baffle plates 11 and 12, and the flow parallel to the traveling direction of hot steel plate 1 while cooling hot steel plate 1. , are discharged from the openings 9 and 10.

Although the openings 9 and 10 are slit-shaped in this embodiment, they may also be circular hole-shaped openings arranged in a row.

<Effects of the Invention> According to the present invention, the cooling water exhibits the same behavior on the upper and lower surfaces of the strip, and not only does the cooling capacity for the upper and lower surfaces of the strip become the same, but also the cooling water does not collide on the lower surface of the strip. Since the subsequent cooling water flows along the strips by the partition plate, the cooling capacity can be increased. Furthermore, the cooling water after the collision flows parallel to the direction of strip movement through the baffle plate, and since there is no flow in the width direction of the strip, uniform cooling is performed in the width direction of the strip, preventing material unevenness and deformation of the strip. It can be prevented.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the structure of an embodiment of the strip cooling device according to the present invention, Fig. 2 is a perspective view of a part of a set of slit-shaped water jet nozzles, and Fig. 3 is a conventional strip cooling device. FIG. 4 is a cross-sectional view showing an example of the device, and a plan view showing the flow of cooling water. In the drawings, 1 is a hot steel plate, 2 is a roll, 5 and 6 are slit-shaped water jet nozzles, 7 and 8 are partition plates, 9 and 10 are openings, and 11 and 12 are baffle plates.

Claims (1)

[Claims] A plurality of sets of slit-shaped nozzles are arranged across the strip plate, and are inclined in the forward and backward direction of the movement of the strip plate so as to face the surface of the strip plate and face each other. partition plates each extending between the sets of the slit-shaped nozzles and having an opening approximately at the center along the direction of movement of the strip; a plurality of baffle plates extending in a direction;