JPS6199559A - Sliding nozzle device using plate having deformed long hole - Google Patents

Abstract

PURPOSE:To prevent the deflection of molten metal flow and to prevent the local erosion of refractories in constitution of a plate by specifying the parts of the plates to be superposed on each other by sliding and the holes for the passage of a molten metal in the constitution of a plate. CONSTITUTION:The sliding nozzle device has >=1 sheets of the plates of which the parts to be superposed of the upper and lower plates has the distance of >=1.5 times the initial corresponding hole diameter and each plate has the hole for the passage of the molten metal having the shape to narrow gradually the width in the sliding direction so as to make successively smaller the communicating part. More specifically, the lower plate 13 moves relatively until the hole 14 for passage of the molten metal overlaps on the deformed long hole 15 and the communicating hole area of both holes 14, 15 is max. in the position A1 which is the fully open position. The position A2 is the position where the communicating hole area of the holes 14, 15 is variable and the flow rate of the molten metal is controlled in this region. The flow line direction of the molten metal in this case coincides with the axial line direction of the nozzle in the sliding nozzle position and the deflection of the flow does not arise. This position corresponds to a half-open position. The position A3 corresponds to the full-close position having no communicating hole area.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a sliding nozzle device for controlling the flow of molten metal from various metal receiving containers such as ladles and tundishes in the steel and non-ferrous manufacturing industries.

[Conventional technology]

FIG. 6 shows an example of the structure of a conventional sliding nozzle device. As shown in the figure, the sliding nozzle device moves the lower plate 3 relative to the upper plate 2 attached to the molten metal receiving container 1 to align or misalign the molten metal passage holes 4 and 5 provided in each. The flow rate is adjusted accordingly.

[Problem that the invention seeks to solve]

However, in such a sliding nozzle device, conventionally, the molten metal passing holes 4 and 5 have a circular cross section, and when the plate is slid when adjusting the flow rate, the flow of the molten metal is deflected and the inner hole side wall of the lower nozzle 6 The bricks collide with each other, causing erosion of the bricks at part A shown in FIG. Further, in the case of ingot injection, this deflected flow causes the injection flow to scatter, which poses an operational obstacle. Furthermore, in continuous steel casting, where an immersion nozzle is attached to the bottom of the sliding nozzle device and injected into the mold, the molten steel flow in the mold becomes uneven, which has a significant negative impact on the quality of the product. It turns out.

Furthermore, if the cracks in the longitudinal direction of the plate enlarge, the life of the plate will be significantly reduced.

An object of the present invention is to provide a sliding nozzle device that can eliminate local meltdown of refractories by preventing such deflection of the molten metal flow.

Means for Solving Problem c] In order to achieve the above object, the present invention provides a plate configuration of a sliding nozzle device such that the overlapping portion of the mutual plates due to sliding motion is 1.5 times the initial f equivalent hole diameter. The structure includes one or more plates having molten metal passage holes having the above distance and narrowing width in the sliding direction so that the communicating portion becomes smaller. In addition,
Here, the initial equivalent hole diameter is the hole diameter expressed as follows, where S is the area of the rectangle or square of the part that is considered to be fully open.

[Effect]

With this configuration, the molten metal 78 flows out through the deformed elongated hole due to the relative sliding of the plates, and the molten metal flow can be prevented from colliding with the side wall of the molten metal passage hole.

〔Example〕

The present invention will be specifically described below based on embodiments shown in the accompanying drawings.

FIG. 1 is a cross-sectional front view of a sliding nozzle device according to the present invention, and FIG. 2 is a plan view taken along the line 1-1 in FIG.

In both figures, 9 is an upper plate fixed to the upper nozzle 11 fitted into the melt field receiving container 10;
A lower plate 13, which fixes the lower nozzle 12 to the lower surface thereof, is attached so as to be relatively slidable in the longitudinal direction.

In the above configuration, the lower plate 13 has a molten metal passage hole 14 having a normal circular cross section.

The present invention is essentially characterized by a deformed elongated hole 15 provided in the upper plate 9, and the deformed elongated hole 15 has a basic hole portion 16 having an initial equivalent hole diameter as shown in FIG. It is formed from the elongated hole portion 17 that follows it.

Further, FIG. 2 shows a case where the center of the basic hole portion 16 is located at position A2.

In the present invention, the molten metal passage hole 14 of the lower plate 13 does not necessarily have to have a circular cross section (for example, it can also have a polygonal cross section or an oval cross section).

Next, the relationship between the deformed elongated hole 15 and the molten metal passage hole 14 will be described.

Position A1 is a case where the lower plate 13 moves relatively and the molten metal passing hole 14 overlaps the deformed elongated hole 15, and both holes 14
．． The area of the communicating hole No. 15 is the largest.

This corresponds to the so-called fully open position.

Position A2 is a position where the communicating hole area of both holes 14 and 15 is variable, and the flow rate of the molten metal is controlled in this area. in this case,
Since the streamline direction of the molten metal coincides with the nozzle axis direction of the sliding nozzle device, no flow deflection occurs. This corresponds to the so-called half-open position.

Position A3 corresponds to a so-called fully closed position where there is no communicating hole area.

In the above embodiment, the deformed elongated holes 15 are provided in the upper plate 9, but of course the deformed elongated holes 15 may be provided in the lower plate 13, and the normal molten metal passage holes 14 may be provided in the upper plate 9.

Further, various shapes can be considered as the shape of the deformed elongated hole 15, and a specific example thereof is shown in FIG.

In Fig. 3a, a circular hole is provided at one end, and the width is gradually narrowed toward the other end.

In Figure 3, a circular hole is provided at one end, and the width narrows discontinuously or stepwise toward the other end, making it easier to control the injection rate of the ingot9. You can choose from three flow rate ranges. In other words, if the fully open zone is the first zone, the narrow straight hole is the second zone, and the straight hole on the upholstery side is the third zone, then the flow rate is suitable for the second zone, and the flow rate is suitable for the third zone. By setting in advance and arbitrarily setting the length of each zone in the plate longitudinal direction, a desired flow rate button can be digitally assembled.

In FIG. 3C, the width becomes gradually narrower toward one end, and there are still parts of the same width.

In Fig. 3d, one end corresponding to the fully open position is large, and the other end has a certain width.

In Fig. 3e, the opening position at one end is a rectangular hole, which narrows discontinuously in three steps toward the other end.

r In Fig. 3f, the width becomes narrower toward one end, but the center line of the plate and the center line of the opening do not necessarily coincide.

FIG. 3g shows a rotating sliding plate whose width becomes narrower in the direction of one rotation.

The third drawing is one in which a normal circular hole is provided separately from the plate shown in FIG. 3g above.

Figure 3i shows the fully open hole at one end and the narrowing opening separated.

FIG. 3j is a modification of FIG. 3i.

Note that in FIGS. 3g to 3j, arrows indicate the sliding direction of the plate.

4 and 5 are enlarged explanatory views of the deformed elongated hole 15, and show the relationship between the initial equivalent diameter and the overall length of the deformed elongated hole 15. Experimentally, the relationship between hole diameter and length is L≧1.
, 5D, a remarkable flow rate control effect could be obtained. Although FIG. 3 is shown as a plan view of the plate, it is naturally possible that the opening shape may be slightly narrower in the thickness direction.

〔Effect of the invention〕

As described above, the present invention can achieve the following effects.

b) During flow rate control, even if the plates are moved relative to each other, a deflected flow does not occur, and no flow that collides with the nozzle inner hole wall occurs.

口) Localized erosion of the nozzle inner hole is eliminated, allowing stable operation.

c) Especially during ingot injection, a quiet flow can be obtained, which is advantageous in terms of operation and quality.

2) Fluctuations in the area of the communicating opening are small compared to the sliding distance, which makes the ratio (change in flow rate/sliding distance %!t) smaller, making it easier to control the flow rate.

e) In general, plates are prone to vertical cracks, but in the present invention, this is not a problem because the cracks are in areas not related to squeeze injection.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional front view of a sliding nozzle device according to the present invention, FIG. 2 is a plan view taken along the line If in FIG. 1, and FIG.
Figures a to 3j are explanatory diagrams of specific examples of deformed long holes, Figures 4 and 5 are explanatory diagrams showing the relationship between the initial equivalent hole diameter and the total length of deformed long holes, and Figure 6 is a conventional sliding FIG. 3 is a cross-sectional front view of the nozzle device. In the figure. 1: Molten metal receiving container 2: Upper plate 3: Lower plate 4: Molten metal passing hole 5: Molten metal passing hole 9: Upper plate 10: Molten metal receiving container 11: Upper nozzle 12: Lower nozzle 13: Lower plate 14: Molten metal passing Hole 15: Deformed elongated hole 16 Two basic holes 17: Elongated hole

Claims (1)

[Claims] 1. In the plate configuration of the sliding nozzle device, the overlapping portions of the plates due to sliding movement are arranged so that the distance is 1.5 times or more than the initial equivalent hole diameter and the communicating portion is small. A sliding nozzle device using a plate having deformed elongated holes, characterized by having one or more plates having molten metal passage holes whose width narrows in the direction of movement. 2. A sliding nozzle device using a plate having deformed elongated holes according to claim 1, wherein the width of the molten metal flow hole in the plate is continuously narrowed in the sliding direction. 3. A sliding nozzle device using a plate having deformed elongated holes according to claim 1, wherein the width of the molten metal flow hole in the plate is discontinuously narrowed in the sliding direction.