JPS6087961A - Cooling grid device for continuous casting installation - Google Patents

Abstract

PURPOSE:To provide a titled device which eliminates deposited matter, improves cooling effect and extends the life of sharp pointed longitudinally long cooling grids by disposing the many cooling grids right under a continuous casting mold at a prescribed space into a zigzag shape in the downstream direction of cooling water. CONSTITUTION:The molten metal in a mold 1 is primarily cooled in the mold 1 and is secondarily cooled by a cooling grid device 4 right under said mold, by which the molten metal is suspended and is made into a billet 2 while the shell is intensified. There are many cooling grids 3, 11 in the device 4 and which are cooled by cooling water 5, 12. The grids 11 are made into the sharp pointed longitudinally long shape at least in the upper part thereof and arranged into a zigzag shape to drop the deposited matter and to improve the cooling effect. The crack and deformation of the grids 11 are obviated and the life thereof is extended. The operating efficiency is thus improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cooling grid device installed directly below a mold in continuous casting equipment.

(Conventional Background and Problems) In recent years, various improvements have been made to continuous casting equipment in order to improve its productivity. By the way, in order to prevent breakout of the slab, it is important to maintain the stability of the slab directly under the mold in addition to the primary cooling inside the mold, and recently cooling grid devices are often used as secondary cooling instead of conventional rolls. has been done. That is, in FIG. 1, the slab (
2) is a cooling grid (
4), and at this time, the slab (2) is cooled by cooling water jetted from the cooling grid (4) and the cooling water spray (5) disposed in the space formed between the cooling grids (4). After being cooled, it is successively guided down by rolls (6).

By the way, the essential requirements for the cooling grid (4) are: (1) prevention of scale and powder accumulation, and (2) the ratio f'L of the cooling grid (4).
This is to prevent deformation and deformation. In other words, if the accumulation of scale and powder on the cooling grid (4) is not prevented, the cooling water spray (5) will cause trouble in cooling the slab, resulting in uneven cooling of the slab and deterioration of its quality. . VC if the late VC school or powder is deposited
The production line must be stopped for a long time to remove the above deposits. In addition, if cracking or deformation of the cooling grid (4) occurs, the support of the slab may become unstable, causing bulging or breakout, so in this case as well, the production line must be stopped and the cooling Grid (4
) needs to be replaced.

The currently adopted cooling grid device is shown in front view as shown in Fig. 1←) and Fig. 2.

A large number of cooling grids (4) in various shapes such as 1IT and 1RO type are arranged so that their inner surfaces form a continuous wall in the vertical direction, that is, in the direction in which the Buddha pieces are pulled out. (4) and the upper wall surface VC between the cooling grids (4), as shown in the second figure, scale and powder (γ) are likely to accumulate, and due to poor cooling due to this deposit, the cooling grids (4) may There was a problem that deformation easily occurred, and the above requirements could not be satisfied.

(Objective of the Invention) The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a cooling grid device that can prevent as much as possible the accumulation of scale, powder, etc. on the cooling grid, as well as its cracking and deformation. It is something to do.

(Structure of the Invention) The present invention supports and uniformly cools the slab directly under the mold.
In a ring grid device, a large number of cooling grids each having at least one longitudinal end in a pointed shape are placed on a wall surface that is continuous in the slab drawing direction and that has a required interval with the pointed portion facing upward. This is a cooling grid device for continuous casting equipment, in which cooling grids are arranged in a staggered manner so that the cooling grids are arranged in a staggered manner, and cooling water sprays are arranged at required positions between these cooling grids.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the accompanying drawings starting from FIG.

In FIG. 3, Ol) is a cooling grid that is a component of the cooling grid device according to the present invention,
The cooling grid (II) Um4 is formed into a rectangular plate-like body as shown in Fig. 4, and both lamp sides thereof have a pointed V shape.
C has been done.

The cooling grid device according to the present invention has a cooling grid having the above-mentioned shape (as shown in FIG. The cooling grids 00 are arranged in a staggered manner so as to form a continuous wall surface in the slab drawing direction, and cooling water sprays (b) are arranged at predetermined positions between these cooling grids 00.

Note that between the cooling grids 01), the cooling water sprayed onto the slab by the cooling water spray (b), and the powder and scale flowing down with this cooling water, as shown by the arrows in Fig. 3. There should be enough space to pass through,
Moreover, the width t of the pointed part of the cooling grid (11) is
It is desirable that the width be 20% or less of the total width of the cooling grid (1), but it is not limited to this. Furthermore, the pointed part of the cooling grid On is not limited to having tapers only on both sides, as shown in Fig. 4, but it also has tapers and tapers on both sides and the inner side in contact with the slab, as shown in No. 5M. It may also have a slope.

(Effects of the Invention) As described above, according to the present invention, scale and powder flow down between the cooling grids together with the cooling water injected onto the slab, so that poor cooling of the slab due to these deposits is minimized. This has a great effect that it also reduces the cracking rate and deformation of the cooling grid, which in turn can contribute to improving the operating rate.

Furthermore, the present invention has the effect that the types (shapes) of cooling grids are reduced and parts management becomes easier.

Incidentally, when comparing the conventional cooling grid device shown in FIG. 2 and the cooling grid device according to the present invention shown in FIG. The life of the cooling grid has also been extended from 200 charges to 400 charges.

[Brief explanation of the drawing]

No. 21, Figure 1 (A) is a schematic diagram showing the positional relationship of the cooling grid, Figure (B) is a rolling diagram in the direction of arrows in (A), and Figure 2 shows the conventional cooling grid device as shown in Figure 1 (B). FIG. 3 is an enlarged view of the main parts of the cooling grid device according to the present invention, similar to FIG. 2, and FIG. 4 is an enlarged view of the main parts as seen from the same direction. FIG. 5 is a perspective view showing one embodiment of the grid; FIG. 5 is a perspective view showing another embodiment similar to FIG. 4; (1) is a mold, (2) is a slab, 01) is a cooling grid, ((2) is a cooling water spray.

Claims (1)

[Claims] (In a cooling grid device that supports and uniformly cools slabs directly under the mold, a large number of cooling grids each having at least one longitudinal end shaped like a point are placed with the pointed part facing upward. A cooling grid for continuous casting equipment, characterized in that the cooling grids are arranged in a staggered manner so as to form a continuous wall surface in the direction in which the Buddha pieces are pulled out, with gaps between them, and cooling water sprays are arranged at required positions between the cooling grids. Device.