JPH0646599Y2 - Casting nozzle holder buffer jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a buffer jig used for a holding portion of a continuous casting nozzle for molten steel or the like.

[Conventional technology]

FIG. 4 shows a holding structure of a casting nozzle 1 in a conventional continuous casting apparatus for molten steel or the like.

As shown in the figure, the casting nozzle 1 has a structure in which it is mounted on a metallic annular holder 3 having a handle portion 2 and is pressed against a molten steel flowing portion 7 by a holding device 6.

As shown in FIG. 3, the holder 3 is matched to the shape of the neck 4 of the casting nozzle 1 to be mounted, and the gap 5 between the holder 3 and the casting nozzle 1 is filled with mortar or ceramic wool or the like. Fixed.

However, such a holding structure for the casting nozzle not only takes a lot of time to apply mortar and the like to the holder, but also takes too long to dry the mortar for fixing the fitted casting nozzle, and also during use or preheating. The heat expands the holder to increase the diameter, and the initial setting position of the casting nozzle is lowered accordingly. When the holder contracts to its original diameter after use, it is in a localized shrink-fit condition, tightening the head of the casting nozzle in the holder. This tightening causes cracks in the casting nozzle, which causes steel leakage and breakage during reuse.

In addition, as a structure that solves the above problems,
The 55-98470 publication discloses a change nozzle (casting nozzle).
Is tightened by a plurality of tightening bodies, and a positioning protrusion is provided on the outer surface of the change nozzle and / or the inner surface of the change nozzle case that accommodates the change nozzle.

With this structure, the change nozzle is tightened by a plurality of tightening bodies without using mortar or the like between the holder and the change nozzle, and the expansion and contraction of the whole can be absorbed uniformly.

However, this casting nozzle holding structure requires work for attaching the tightening body, and the tightening effect is partially lost during repeated thermal expansion and contraction during use, which causes the nozzle to crack. It is also the cause.

[Problems to be solved by the device]

The problem to be solved in the present invention is to solve the problems of the above-mentioned conventional casting nozzle holding device, have the capability of thermal expansion and contraction due to repeated heating, and can withstand long-term use including reuse without trouble. To obtain a casting nozzle holding mechanism.

[Means for Solving the Problems]

The present invention solves the above problem by mounting a buffer jig instead of mortar or the like on the contact portion between the holder of the casting nozzle holding device and the casting nozzle, and the buffer jig is expandable and contractible with both ends open. It is characterized in that it is formed in a spiral shape.

As the heat-resistant material for the above-mentioned buffer jig, heat-resistant steel, ceramic material, heat-resistant resin, etc. can be used. The combined materials and the like are formed in a spiral shape so that they can be fitted to the contact portion of the casting nozzle with the holder, that is, the neck portion of the casting nozzle.

[Action]

The shock-absorbing jig of the present invention has a heat-resistant spiral-shaped body with both open ends, and is itself expandable and contractible in the linear and axial directions.
The heat conduction to the holder is reduced to suppress expansion due to heating of the holder, and the local tightening force exerted on the nozzle by the extension in the linear direction is absorbed.

〔Example〕

FIG. 1 shows the structure of a buffer jig 10 of the present invention. Same buffer jig
Numeral 10 is formed into a spiral shape that matches the shape of the shoulder portion of the casting nozzle into which a steel rod having a diameter of approximately 5 mm is fitted.

FIG. 2 shows the shock absorbing jig 10 of the present invention fitted to the neck portion 4 of the casting nozzle 1.

The casting nozzle 1 fitted with the buffer jig 10 in this state can be directly applied to, for example, a dipping nozzle used between a tundish and a mold of a continuous casting facility for steel, or a long nozzle used between a ladle and a tundish.

By applying this long nozzle to actual operation, it was possible to use it for pouring molten steel from the ladle eight times, and it was in a state where it could be reused sufficiently thereafter. On the other hand, in the conventional structure shown in FIG. 4, after the molten steel was poured out from the ladle eight times, the inside of the contact portion between the holder and the long nozzle was cracked and could not be reused.

[Effect of device]

The holding jig of the casting nozzle of the present invention has the following effects.

(1) Since it can be easily manufactured and installed, work efficiency and cost can be sufficiently satisfied.

(2) In the state where it is attached to the casting nozzle, since it is at both ends, it expands in the diametrical direction, which is restrained by the holder when it receives heat, or contracts when the heat is reduced.
It can be absorbed by expansion and contraction of the jig in the line direction, and tightening to the casting nozzle can be minimized.

(3) Since heat transfer due to heating of the nozzle is reduced and expansion and contraction of the holder are reduced, deformation can be reduced and life can be extended.

[Brief description of drawings]

FIG. 1 is an overall view of the jig of the present invention, and FIG. 2 is a view of attachment to a casting nozzle. FIG. 3 shows a schematic view of the holder, and FIG. 4 shows a conventional example. 1: Casting nozzle, 2: Handle part 3: Annular holder, 4: Neck part 5: Gap, 6: Holding device 7: Molten steel distribution part, 10: Buffer jig

Claims (1)

[Scope of utility model registration request] 1. A cushioning jig to be mounted on a contact portion between a holder of a casting nozzle holding device and a casting nozzle, the casting jig holding portion buffering jig being made of a heat-resistant material that is expandable and contractible in a spiral shape. .