JPS5844907Y2 - nozzle exchange device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a lower nozzle changing device for a sliding nozzle in a container for storing molten metal, such as a ladle or a tundish for continuous casting.

The sliding nozzle commonly used in the past consists of a fixed base on which the upper nozzle is placed, a sliding plate that slides in contact with the lower surface of the fixed base, and a lower part that is integrally attached to the sliding plate. The lower nozzle is removably attached to the sliding plate holding fitting via a nozzle receiver.

However, in conventional sliding mechanisms, the lower nozzle is attached using a bolt tightening method or simply using a screwdriver, which has the disadvantage that it takes a lot of time to attach and remove the lower nozzle.

Therefore, when the immersion nozzle must be replaced during casting, as in continuous casting, for example, the conventional method inevitably deteriorates the surface and internal quality of the casting interruption part.

Therefore, especially in continuous casting, from the standpoint of quality and yield, it is advantageous to have as short a casting interruption time and a single nozzle replacement time as possible.

In order to shorten the time required to replace the lower nozzle of the sliding nozzle, this invention improves the attachment/detachment mechanism between the sliding plate and the lower nozzle.This lower nozzle replacement device has a simple structure and allows the lower nozzle to be replaced in a short time. It provides:

Here, the case of a sliding nozzle for continuous casting will be explained as an example.

In Fig. 1, 1 is a tundish, 2 is a tundish nozzle, 3 is a fixed base plate, 4 is a sliding plate, 5 is a sliding plate holding bracket, 6 is an attachment for installing the immersion nozzle, γ is an immersion nozzle receiver, 8 is an immersion nozzle, and although these are conventional ones, this idea has been modified to the attachment 6 and the immersion nozzle receiver T, so that the immersion nozzle can be installed and removed just by operating the cylinder. That is.

That is, a pair of left and right immersion nozzles integrally attached to the sliding plate holding fitting 5 are attached to the inner wall of the side of the attachment 6, and two immersion nozzles 8 are placed facing each other at a distance from each other on the sliding plate. A recessed groove rail 9 having a G-shaped cross section and a length that can be slidably suspended and supported in a direction perpendicular to the moving direction of the recessed nozzle rail 9 is provided, and the submerged nozzle receiver I is fitted into the side recess of the recessed groove rail 9. A fitting protrusion 10 which is slidably fitted into the concave and convex portions is protruded so as to be received in the lower recess, so that the immersion nozzle receiver I is horizontally slidably suspended and supported by the attachment 6 via this protrusion. establish.

In order to fit the submerged nozzle 8 to be used in close contact with the sliding plate 4, a nozzle positioning protrusion 11 is provided on the upper surface of the fitting protrusion 10, while a nozzle positioning protrusion 11 is provided on the upper surface of the grooved rail 9 provided on the attachment 6. is a notch 1 into which the projection 11 can be fitted;
2 is formed, and the dipping nozzle 8 can be tightly fitted to the sliding plate 4 by the uneven fitting between the protrusion 11 and the notch 12. Fitting protrusion 10
This is done by driving a wedge-shaped tipter 13 between the two and floating the immersion nozzle receiver 1.

On the other hand, when taking out the immersion nozzle 8 that is closely fixed to the sliding plate 4 by the wedge-shaped cotter 13, the wedge-shaped cotter 13
must be removed and the immersion nozzle 8 must be lowered to its original state.

Therefore, in this invention, a cutout material 14 that can slide inside the grooved rail 9 is used.

As shown in the drawing, this cutout material has a thin wall portion 15 on the tip side that can fit into the gap between the grooved rail 9 and the fitting protrusion 10.
and has a thick inner part 16 on the rear end side, and a thin part 15.
The step portion 1γ, which is the boundary between the thick portion 16 and the nozzle receiver 1
The fitting protrusion 10 is provided so as to come into contact with the fitting protrusion 10 protruding therefrom.

This is because the new and old immersion nozzles are moved together following the detachment of the wedge-shaped colander 13 (broken line in Figure 1).

Reference numeral 18 denotes a cylinder for attaching and detaching the immersion nozzle, which is attached to a tanditushka (not shown).

It goes without saying that when this invention is put into practice, a notch 19 is provided on the side surface of the nozzle cover, and the concave groove rail 9 is provided in a protruding manner.

Next, the procedure for replacing the immersion nozzle will be explained.

First, the sliding plate 4 is slid to close the nozzle hole, and the tundish is raised or left in its casing, with the immersion nozzle 8 exposed above the mold.

Then, the rear end of the new immersion nozzle 8, which has been previously suspended on the attachment 6, is pushed out from the right to the left in FIG. 1 by the cylinder 18.

At this time, use the old immersion nozzle (used) 8 and the new immersion nozzle 8.
The cutter 13 is extracted by the cutter removing material 14 interposed therebetween, and at the same time, the old immersion nozzle 8 is pushed and slid by the stepped portion 17 of the cutter cutter plate, and is separated from the attachment 6.

At this time, the new submerged nozzle 8 moves to the nozzle center line and stops at a position where the fitting protrusion 11 of the nozzle receiver 7 can fit into the notch 12 provided in the grooved rail 9 of the attachment.

After that, the wedge-shaped tipter 13 is driven between the groove rail 9 of the attachment and the fitting protrusion 10 of the nozzle receiver to float the immersion nozzle 8, and the nozzle positioning protrusion 11 is fitted into the notch 12 of the groove. Then, fit the new immersion nozzle into the sliding plate 4 and bring it into close contact.

By repeating the above operation nine times, continuous casting can be carried out by simply replacing the immersion nozzle without replacing the tundish.

As mentioned above, this idea adds a mechanism that suspends and supports the lower nozzle so that it can slide in a direction perpendicular to the direction of movement of the slide plate, to the existing attachment that is attached to the slide plate holding bracket.
The lower nozzle is tightened using a lower nozzle button and the lower nozzle removal material, and the lower nozzle can be installed and removed simply by operating the cylinder, so the lower nozzle can be replaced smoothly and quickly, and existing equipment can be replaced easily. It has the advantage that it can be easily implemented with only simple additional modifications without extensive modification.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of this invention, and FIG. 2 is a perspective view showing the main parts of the same. In the figure 1...Tandish nozzle, 2...Tandish nozzle, 3...Fixed base plate, 4...
...Sliding plate, 5...Sliding plate holding fitting, 6.
... Attachment, T ... Nozzle receiver, 8 ... Immersion nozzle, 9 ... Concave groove rail, 10 ... Fitting protrusion, 11 ...Nozzle positioning protrusion, 12...Notch, 13...
... Wedge-shaped cotter, 14... Thin cutter material, 15... Thin wall part, 16... Thick wall part, 1T... Step part, 18 ...Cylinder, 19...Notch.

Claims (1)

[Scope of utility model registration request] An attachment that holds the two lower nozzles movably in the horizontal direction by a concave-convex fitting sliding mechanism is fixed to the sliding nozzle, and the sliding mechanism is attached to the attachment side. A fitting protrusion horizontally protruding from the lower nozzle holder is slidably fitted into a concave groove rail, and one lower nozzle is wedge-shaped to be driven between the grooved rail and the fitting protrusion. A nozzle changing device, characterized in that the lower nozzle can be fitted tightly to the sliding nozzle slide plate using a lower nozzle, the other lower nozzle is freely suspended from the attachment, and a lower nozzle is interposed between the two lower nozzles. .