KR20020095301A - Auto centering dipping nozzle assembly - Google Patents

Abstract

PURPOSE: A submerged nozzle assembly with automatic centering function is provided to maximize assembling efficiency between the wall block and the submerged nozzle and restrain flowing even during fixing and releasing of a stopper by simultaneously inserting a submerged nozzle into a wall block and automatically centering them. CONSTITUTION: The submerged nozzle assembly with automatic centering function comprises a plurality of fixing keys(34) which are projectingly formed on the upper outer circumference of a submerged nozzle(30') for guiding discharge of molten steel from a tundish into a mold; a flange shaped sealing flap(36) which is fixed onto the upper surface of the submerged nozzle(30') in such a way that the sealing flap(36) is more outwardly projected than the fixing keys(34); a sealing groove(26) which has a diameter corresponding to the sealing flap(36) and is female grooved on the upper surface of a wall block(20'); and fixing grooves(24) the corresponding number of which are formed so that the fixing grooves(24) are coupled to the fixing keys(34) on the upper inner circumference of a hole into which the submerged nozzle(30') that is the inner surface of the sealing groove(26) is inserted, wherein the fixing keys(34) and the sealing flap(36) are integrally formed together with the submerged nozzle(30'), four of the fixing keys(34) are installed along the upper outer circumference of the submerged nozzle(30') with spaced apart from each other in a distance of 90 degrees of an angle, and the sealing flap(36) has a larger radius than the radius from the center of the submerged nozzle(30') to the fixing keys(34).

Description

Immersion nozzle assembly with automatic centering function {AUTO CENTERING DIPPING NOZZLE ASSEMBLY}

The present invention relates to an immersion nozzle assembly having an automatic centering function of an improved structure to improve flow prevention and sealing efficiency as one of continuous casting facilities.

The molten steel, which is taken through the steelmaking process, is discharged into the mold through an immersion nozzle inserted into the tundish to perform continuous casting.

The conventional stopper immersion nozzle has a cylindrical well block 20 inserted therethrough at a predetermined position on the bottom surface of the tundish 10 as shown in FIG. 1, and the immersion nozzle penetrates the well block 20. 30 is simply inserted to be exposed to the back of the tundish 10 and then the lower end thereof is positioned inside the mold 40, thereby completing the installation.

Thus, the worker waiting outside the tundish 10 is inserted into the molten steel outlet 32 of the immersion nozzle 30 exposed to the back of the tundish 10 through the well block 20 when the immersion nozzle 30 is disposed. The centering work is performed while rotating from side to side, but the centering work by these manual work needs to be checked with the naked eye, so that the accuracy decreases and the remarkable difference depends on the skill of the operator.

In particular, when assembling the stopper 12 after the immersion nozzle 30 is arranged, the preparation work for molten steel taking is performed by adjusting the stopper fixing nut 14 by using a tool, in which case the stopper 12 is a well block. Since it is in contact with the upper inner diameter of the immersion nozzle 30 assembled in the 20, it rotates with the fixing nut 12, and the immersion nozzle 30 under load also rotates at the same time, so that the stopper 12 is installed. Afterwards, the need for centering the immersion nozzle 30 again is caused.

Furthermore, as shown in (a, b) of FIG. 2, when the stopper 12 is opened while the casting operation is performed while the immersion nozzle 30 is not accurately centered, the immersion nozzle 30 is biased toward one side of the mold 40. The molten steel discharged from the molten steel discharge port 32 of the) is biased and hit on one side of the copper plate of the mold 40, thereby forming an unbalanced coagulation cell, causing a poor quality of the molten steel spill accident.

The present invention was created in view of the above-described problems of the prior art, and the assembly between the well block and the immersion nozzle by inserting the immersion nozzle into the well block for continuous casting and automatically centering the same. It is an object of the present invention to provide an immersion nozzle assembly having an automatic centering function of an improved structure that maximizes efficiency and also restrains flow during stopper fixation and release.

The above object of the present invention includes a plurality of fixing keys protruding from the upper outer periphery of the immersion nozzle for guiding discharge of molten steel from the tundish to the mold; A flange-shaped sealing flap fixed to an upper surface of the immersion nozzle; A sealing groove having a diameter corresponding to the sealing flap and recessed in an upper surface of the well block; Providing an immersion nozzle assembly having an automatic centering function, characterized in that it comprises a fixing groove formed in the number corresponding to the fixing key to the inner peripheral edge of the hole is inserted into the immersion nozzle which is the inner surface of the sealing groove. Is achieved.

1 is a perspective view showing a partial incision showing the installation state of the conventional immersion nozzle,

2 is an exemplary view showing an installation process of a conventional immersion nozzle;

3 is an exploded perspective view and a longitudinal sectional view of the immersion nozzle according to the present invention;

Figure 4 is an external perspective view of a well block in which the present invention immersion nozzle is inserted,

5 and 6 are a perspective view and a longitudinal cross-sectional view of the installation state of the immersion nozzle of the present invention.

Explanation of symbols on the main parts of the drawings

10: tundish 20,20 ': well block

24: fixing groove 26: sealing groove

30,30 ': Immersion nozzle 34: Sticky key

36: sealing flap 40: mold

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Figure 3 is an exploded perspective view and a longitudinal cross-sectional view showing the appearance of the immersion nozzle according to the present invention.

According to Figure 3, the immersion nozzle 30 'of the present invention is formed with a plurality of fixing keys 34 on the outer periphery of its length.

It is preferable that four fixing keys 34 are formed at approximately 90 ° along the outer circumference of the upper end of the immersion nozzle 30 '.

In addition, a sealing flap 36 is fixed to the upper end surface of the immersion nozzle 30 'in the form of a flange.

Preferably, the fixing key 34 and the sealing flap 36 are injection molded integrally with the immersion nozzle 30 '.

The sealing flap 36 is more preferably projected outward than the fixing key 34 to serve as a locking jaw.

Molten steel discharge port 32 is formed symmetrically with each other on both sides of the lower edge of the immersion nozzle (30 ') as before.

Meanwhile, as shown in FIG. 4, the well block 20 ′ has a diameter corresponding to the diameter of the sealing flap 36 on the top surface thereof, and a sealing groove 26 is formed to be recessed.

In addition, a fixing groove 24 formed by being recessed downward in a shape corresponding to the fixing key 34 is provided at the center of the sealing groove 26, that is, at the upper circumferential edge of the upper portion of the portion where the immersion nozzle 30 ′ is inserted. .

The present invention made up of such a configuration has the following operational relationship.

Referring to FIGS. 1 and 5 and 6, a well block 20 ′ is inserted into a hole formed at one side of the bottom surface of the tundish 10 that is waiting.

Subsequently, the lower end of the immersion nozzle 30 'is inserted through the upper side of the well block 20' so that the molten steel discharge port 32 protrudes to the rear surface of the tundish 10.

At this time, the fixing key 34 formed in the immersion nozzle 30 'is appropriately adjusted so as to be inserted into the fixing groove 24 of the well block 20'.

Simultaneously with the insertion, the sealing flap 36 of the immersion nozzle 30 'is seated in the sealing groove 26 formed in the well block 20'.

Therefore, the immersion nozzle 30 'is easily assembled while securing centering with only one insertion operation without clearance or flow with the well block 20'.

In this state, the upper end of the immersion nozzle 30 ′ is temporarily closed with the stopper 12 to receive molten steel transferred from the steelmaking process into the tundish 10. Even if the immersion nozzle 30 'is key-coupled, the assembly is maintained without being flowed or rotated, and the stopper 12 is lifted up and down while the molten steel is taken and discharged.

As described in detail above, the present invention provides the following effects.

First, even if the immersion nozzle is inserted into the well block, it is automatically centered to improve work efficiency.

Secondly, the immersion nozzle does not flow or rotate even when the stopper adjustment for receiving and discharging the molten steel can smoothly discharge the molten steel.

Third, since the centering is always secured constantly, the solidification cell in the mold is uniformly formed, thereby improving product quality.

Fourth, since the sealing flap is sealed between the outer circumference of the immersion nozzle and the inner circumference of the well block, the sealing efficiency is improved.

Claims (4)

A plurality of fixing keys 34 protruding from the top end of the immersion nozzle 30 'for guiding and discharging molten steel from the tundish 10 to the mold 40; A flange-shaped sealing flap 36 fixed to an upper end surface of the immersion nozzle 30 'to protrude outwardly from the fixing key 34; A sealing groove 26 having a diameter corresponding to the sealing flap 36 and having a recess formed in an upper end surface of the well block 20 '; And a fixing groove 24 formed in a number corresponding to the fixing key 34 so as to be engageable with the fixing key 34 on the inner circumferential edge of the hole into which the immersion nozzle 30 ′, which is the inner surface of the sealing groove 26, is inserted. Immersion nozzle assembly having an automatic centering function. The immersion nozzle assembly of claim 1, wherein the fixing key (34) and the sealing flap (36) are integrally formed with the immersion nozzle (30 '). The immersion nozzle assembly according to claim 1, wherein the fixing keys (34) are installed at intervals of 90 ° to each other along the outer circumference of the upper end of the immersion nozzle (30 '). An immersion nozzle assembly according to claim 1, wherein said sealing flap (36) has a radius greater than the radius from the center of the immersion nozzle (30 ') to the fixing key (34).