JPS6222241Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is designed to cool a high-temperature steel material such as a hot-rolled material by forming a curtain-like laminar flow of water. The present invention relates to a cooling device that eliminates interference flows occurring at the collision part of curtain-like laminar flows.

For example, in continuous hot rolling equipment, a strip that has undergone finish rolling is cooled by water while running on a hot run table, and is wound up after reaching a predetermined temperature. This cooling temperature is determined depending on the type of product, and for metallurgical purposes, it is necessary to maintain the appropriate temperature during rolling and to control the appropriate winding temperature, that is, the temperature of the strip on the hot run table. This has an important impact on product quality.

As shown in Figure 1, the conventional cooling system is composed of a plurality of cooling banks a ₁ , a ₂ , a ₃ . . . arranged from the upstream side to the downstream side, making cooling control easy. For each cooling bank A ₁ , A ₂ , A ₃ …
...A method has been devised in which draining devices b ₁ , b ₂ , b ₃ ... are installed downstream of the group, and high-pressure water is injected to separate the cooling zone so that the cooling water of the upstream bank does not affect the downstream bank. .

However, in the above-mentioned device, since the cooling water w on the strip S is blown off with high-pressure water,
For example, in the case of the one shown in FIG. 1, there is a risk that the cooling water falling from the cooling water header located upstream of the draining device will cause lateral vibration, reducing the cooling efficiency. In addition, the cooling water that flows down and collides with the strip S from each cooling water header generally flows downstream, and an interference flow d is created in the part where the cooling water falls and collides with the strip S from the downstream cooling water header.
This also causes a decrease in cooling efficiency.

The present invention was developed with the aim of eliminating the above-mentioned drawbacks of conventional equipment, and includes a plurality of cooling water headers that are arranged at predetermined positions to form a curtain-like laminar flow, and each cooling water header is A curtain-shaped laminar flow having a flow rate lower than that of the cooling water header is formed at a predetermined position between the cooling water header and the cooling water header in order to prevent interference flow from occurring at the collision part of the curtain-shaped laminar flow that has fallen onto the high-temperature steel material from the cooling water header. It is characterized by having a header that allows it to be moved.

Embodiments of the present invention will be described below with reference to the drawings.

2 shows an embodiment of the present invention, in which nozzles 2 having a rectangular cross section and extending along the tube 1 are fixed to the lower part of the tube 1 whose axis extends in the width direction of the strip S, and cooling water headers 3 are constructed so that cooling water can be supplied from the tube 1 to the nozzles 2, and headers 6 are arranged between the cooling water headers 3, 3, each of which is composed of a tube 4 and a nozzle 5 having the same structure as the cooling water header, to prevent mutual interference of the cooling water. In the figure, reference numerals 7 and 8 denote interference flows.

When cooling the strip S, the cooling water is caused to fall from the cooling water header 3 as a curtain-like laminar flow and collide with the strip S, and the water is also flowed from the header 6 at a flow rate lower than that of the cooling water from the cooling water header 3. It falls as a curtain-like laminar flow, collides with the strip S, and is cooled. Then, the cooling water flows separately to the upstream side and the downstream side, but the water that falls and collides with the strip S from the header 6 also flows separately to the upstream side and the downstream side.

However, water flowing from the upstream side to the downstream side flows in the same direction as the strip traveling direction, so the flow velocity is high, and water flowing from the downstream side to the upstream side flows in the opposite direction to the strip traveling direction, so the flow velocity is low. Therefore, the cooling water flowing from the upstream cooling water header 3 to the downstream side creates an interference flow 7 near the part where the curtain-like laminar flow of the header 6 collides with the strip S, and on the other hand, the cooling water flowing from the downstream cooling water header 3 The cooling water flowing upstream from header 3 cannot flow that far upstream, and the curtain-like laminar flow from header 6 falls on and collides with the strip, and the curtain-like laminar flow from cooling water header 3 on the downstream side. Interference flow 8 is placed at the required position between the position where the flow falls and collides with the strip.
occurs. In other words, the curtain-shaped laminar flow that has fallen onto the strip from the header 6 and collided with the strip S causes an interference flow at the collision area between the curtain-shaped laminar flow that has fallen and collided with the strip S from the cooling water headers 3, 3. To prevent.

The water in the interference flows 7 and 8 flows in the width direction of the strip and falls to the bottom of the strip.

In the embodiment of the present invention, the case where the high-temperature steel material to be cooled is a strip was explained, but it is also applicable to high-temperature steel materials such as hot-rolled material, and the header 6 for interference prevention is also applicable. Of course, it is possible to use a conventional pipe laminar flow header, and to make various other changes without departing from the gist of the present invention.

Since the high-temperature steel cooling device of the present invention has the above-described configuration, no interference flow occurs in the part of the curtain-like laminar flow that falls and collides with the cooling water header, and there is no interference flow from the header to prevent interference flow. water can also contribute to cooling, and there is no water splashing, unlike when draining with high-pressure fluid. Therefore, the cooling efficiency can be greatly improved and the strip can be easily cooled to a desired temperature, so that various excellent effects can be achieved, such as improving product quality.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional cooling device, and FIG. 2 is an explanatory diagram of a cooling device of the present invention. In the figure, 3 is the cooling water header, 6 is the header, 7,
8 indicates an interference flow.

Claims (1)

[Scope of utility model registration request] A plurality of cooling water headers that can form a curtain-like laminar flow are arranged at required positions,
A laminar flow with a flow rate lower than that of the cooling water header is placed at a predetermined position between each cooling water header in order to prevent interference flow from occurring at the collision part of the curtain-shaped laminar flow that has fallen from the cooling water header onto the high-temperature steel material. 1. A cooling device for high-temperature steel, characterized in that it is equipped with a header capable of forming.