JP5782554B1 - Nozzle for pouring and continuous casting apparatus provided with the nozzle for pouring - Google Patents

Abstract

There is provided a pouring nozzle capable of maintaining the nozzle temperature during continuous casting and extending the service life of the nozzle, and a continuous casting apparatus including the pouring nozzle. A nozzle body 3 that surrounds a pouring passage 30 communicating with a storage space of a refractory container 21 and has an inner surface 31 facing the pouring passage 30 and an outer surface 32 opposite to the inner surface 31; The nozzle body 3 is supported so as to wrap the outer surface 32 of the body 3 and includes a support seat 4 attached to the bottom of the refractory container 21. The support seat 4 forms a first outer peripheral surface of the support seat 4. A stainless steel cover 41, a heating unit 42 that faces the outer surface 32 of the nozzle body 3 and can heat the nozzle body 3 via the outer surface 32, and between the heating unit 42 and the first stainless steel cover 41 And a first refractory material 43 interposed therebetween. [Selection] Figure 3

Description

  The present invention relates to a pouring nozzle and a continuous casting apparatus provided with the pouring nozzle, and is connected in particular to the bottom of a refractory container such as a ladle surrounding a storage space in which molten metal can be stored in continuous casting. The present invention relates to a pouring nozzle and a continuous casting apparatus including the pouring nozzle.

  In metal casting, for example, as shown in FIG. 1, molten metal refined in a refining furnace such as a converter is accommodated in a refractory container 11 such as a ladle. After the next refining process, a continuous casting process is used in which molten metal is flowed out from the pouring means 13 attached to the bottom of the refractory container 11 to produce a predetermined slab.

  In this continuous casting process, when the molten metal accommodated in the refractory container 11 is allowed to flow out from the pouring means 13 including the pouring nozzle 12, the temperature of the pouring nozzle 12 is relatively low, so The molten metal passing through the nozzle 12 may be cooled and solidified, and the pouring nozzle 12 may become clogged and the molten metal may not flow out.

  On the other hand, the support seat 130 for supporting the pouring nozzle 12 in the pouring means 13 usually uses a refractory material. However, the ordinary refractory material has a disadvantage that it has low rigidity, and is altered during use to cause internal strain. In the high temperature environment, a thermal change is applied and the internal stress is promoted to crack or collapse as shown in FIG.

  Patent Document 1 discloses a method for preheating a casting nozzle in a continuous casting process. In this method, a burner that preheats by blowing combustion gas toward the inside of the casting nozzle is used. However, since the casting nozzle cannot be heated in the continuous casting process, there is still room for improvement.

JP 2010-29898 specification

  In view of the above problems, the present invention provides a pouring nozzle capable of maintaining the nozzle temperature during continuous casting and extending the service life of the nozzle, and a continuous casting apparatus including the pouring nozzle. Objective.

  In order to achieve the above object, the present invention provides a pouring nozzle connected in communication with the bottom of a refractory container surrounding a storage space capable of storing molten metal, the hot water inlet communicating with the storage space, A nozzle body having an inner surface facing the pouring passage and an outer surface on the opposite side of the inner surface, and an outer surface of the nozzle body surrounding the pouring passage having a pouring outlet on the opposite side of the pouring gate And a support seat attached to the bottom of the refractory container, the support seat comprising a first stainless steel cover constituting an outer peripheral surface of the support seat, and the nozzle body. A heating unit that faces at least a part of the outer surface and that can heat the nozzle body via the part, and a first unit interposed between the heating unit and the first stainless steel cover With refractory material That is configured to have a provide a pouring nozzle according to claim.

  The pouring nozzle may be reciprocated between a preheating position that is arranged outside the pouring gate and heats the nozzle body and a standby position that does not interfere with the flow of molten metal flowing out of the pouring tap. Preferably further preheating means arranged and arranged to be able to do so.

  In the pouring nozzle, the preheating means faces the nozzle body and preheats the nozzle body when the preheating means moves to the preheating position, and faces the nozzle body of the preheating unit. It is preferable to have a second refractory material that wraps a portion other than the portion from the outside and a second stainless steel cover that wraps the second refractory material from the outside.

  Further, the present invention comprises a refractory container surrounding a storage space in which molten metal can be stored, and the pouring nozzle connected to the bottom of the refractory container. A casting apparatus is also provided.

  The said continuous casting apparatus WHEREIN: The 1st support plate currently fixed to the bottom part of the said refractory container, enclosing the said 1st stainless steel cover which the said support seat which the said nozzle for pouring has has from the outer side, and the said support A plurality of second support plates fixed to the outside of the first stainless steel cover of the seat, and corresponding to each of the second support plates, and passing through the corresponding second support plate Preferably, the apparatus further includes a plurality of fixing screws screwed into the first support plate.

  According to the above configuration, the support seat that supports the nozzle body and is attached to the bottom of the refractory container in the present invention is provided on at least a part of the outer surface of the first stainless steel cover and the nozzle body. And a heating unit capable of heating the nozzle body via the part, and a first refractory material interposed between the heating unit and the first stainless steel cover. Therefore, even when the molten metal passes through the pouring passage, the nozzle body can be continuously heated to keep the temperature constant, thereby preventing the pouring passage from being blocked by cooling of the molten metal. In addition, the service life of the nozzle can be extended.

It is a longitudinal cross-sectional view by which the structure of the conventional continuous casting apparatus provided with a refractory container and a pouring means is shown. It is a cross-sectional view by which a mode that a crack enters into the conventional pouring means. It is a longitudinal cross-sectional view by which the structure of the continuous casting apparatus provided with the nozzle for pouring of this invention is shown.

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

  FIG. 3 is a longitudinal sectional view showing a configuration of a continuous casting apparatus provided with a pouring nozzle of the present invention.

  As shown in the figure, the pouring nozzle of the present invention is a pouring nozzle 1 connected in communication with the bottom of a refractory container 21 surrounding a storage space 20 in which molten metal can be stored, A support seat 4 and preheating means 5 are provided.

  The nozzle body 3 surrounds a pouring passage 30 having a hot water inlet 301 communicating with the storage space 20 and a hot water outlet 302 on the opposite side of the hot water inlet 301, and an inner surface 31 facing the pouring passage 30 and the inner surface It is made of a refractory material so that it has an outer surface 32 opposite to 31.

  The support seat 4 supports the nozzle body 3 so as to wrap the outer surface 32 of the nozzle body 3, is attached to the bottom of the fireproof container 21, and is a first stainless steel constituting the outer peripheral surface of the support seat 4. A cover 41, a heating unit 42 that faces at least a part of the outer surface 32 of the nozzle body 3 and can heat the nozzle body 3 via the part, and the heating unit 42 and the first stainless steel cover 41 A first refractory material 43 interposed therebetween.

  The preheating means 5 is arranged outside the hot water outlet 302 of the nozzle body 3 so as to heat the nozzle main body 3 (a position shown in FIG. 3) and the flow of molten metal flowing out of the hot water outlet 302. The nozzle body 3 is arranged so as to be able to reciprocate between an unobstructed standby position (not shown), and when the preheating means 5 moves to the preheating position, the nozzle body 3 is preheated facing the nozzle body 3. A preheating unit 51 that can be heated in such a manner, a second refractory material 52 that wraps the portion other than the portion facing the nozzle body 3 of the preheating unit 51 from the outside, and a second that wraps the second refractory material 52 from the outside. And a stainless steel cover 53.

  In addition, the continuous casting apparatus of the present invention includes the above-mentioned fireproof container 21 and the pouring nozzle 1, and encloses the first stainless steel cover 41 included in the support seat 4 provided with the pouring nozzle 1 from the outside. However, the first support plate 6 fixed to the bottom of the refractory container 21 via the heat insulating layer 22 and a plurality of second supports fixed to the outside of the first stainless steel cover 41 of the support seat 4. Plate 7 and a plurality of fixing screws 8 corresponding to each second support plate 7 and passing through the corresponding second support plate 7 and then screwed into the first support plate 6. Yes.

  Furthermore, an annular fixing recess 211 is formed on the outer peripheral surface of the refractory container 21, and the inner peripheral edge of the annular fixing plate 23 enters the fixing recess 211 of the refractory container 21, and the outer peripheral edge The elastic screw 24 is attached to the refractory container 21 and the first support plate 6 so that the portion comes into contact with the first support plate 6 and fixes the outer peripheral edge of the fixing plate 23 to the first support plate 6. The fixing plate 23 is fixed to the first support plate 6 and the refractory container 21 is stably attached to the first support plate 6.

  With this configuration, the pouring nozzle of the present invention and the continuous casting apparatus including the pouring nozzle continue to heat the nozzle body 3 with the heating unit 42 in a state where the molten metal passes through the pouring passage 30. Thus, the temperature of the nozzle body 3 can be kept constant, the molten metal can be prevented from being blocked by the molten metal cooling, and the service life of the nozzle can be extended.

  Further, since the preheating means 5 is also provided, the temperature of the nozzle body 3 can be sufficiently raised before use, and the temperature of the nozzle body 3 can be secured from the beginning of continuous casting. Furthermore, since the support seat 4 that supports the nozzle body 3 has a three-layer structure including a first stainless cover 41, a heating unit 42, and a first refractory material 43, the nozzle body 3 is covered by the heating unit 42. The first stainless steel cover 41 can wrap the first refractory material 43 and support it.

  According to the above configuration, the support seat that supports the nozzle body and is attached to the bottom of the refractory container in the present invention is provided on at least a part of the outer surface of the first stainless steel cover and the nozzle body. And a heating unit capable of heating the nozzle body via the part, and a first refractory material interposed between the heating unit and the first stainless steel cover. Therefore, even when the molten metal passes through the pouring passage, the nozzle body can be continuously heated to keep the temperature constant, thereby preventing the pouring passage from being blocked by cooling of the molten metal. It is possible to provide a pouring nozzle in which the service life of the nozzle is extended and a continuous casting apparatus including the pouring nozzle.

DESCRIPTION OF SYMBOLS 1 Pouring nozzle 20 Storage space 21 Refractory container 211 Fixing recessed part 22 Heat insulation layer 23 Fixing plate 24 Elastic screw 3 Nozzle main body 30 Pouring passage 301 Hot water inlet 302 Hot water outlet 31 Inner surface 32 Outer surface 4 Support seat 41 First seat Stainless steel cover 42 Heating unit 43 First refractory material 5 Preheating means 51 Preheating unit 52 Second refractory material 53 Second stainless steel cover 6 First support plate 7 Second support plate 8 Fixing screw

Claims (3)

A pouring nozzle connected in communication with the bottom of a refractory container surrounding a storage space capable of storing molten metal,
A nozzle having an inner surface facing the pouring passage and an outer surface opposite to the inner surface, enclosing a pouring passage having a hot water inlet communicating with the storage space and a hot water outlet opposite to the hot water inlet The body,
And supporting the nozzle body so as to wrap the outer surface of the nozzle body, and comprising a support seat attached to the bottom of the refractory container,
The support seat is
A first stainless steel cover constituting the outer peripheral surface of the support seat;
A heating unit facing at least a part of the outer surface of the nozzle body and capable of heating the nozzle body via the part;
Have a, a first refractory material interposed between the first stainless steel cover and the heating unit,
Arranged so as to be able to reciprocate between a preheating position that is arranged outside the pouring gate and heats the nozzle body and a standby position that does not interfere with the flow of molten metal flowing out of the pouring gate. Further equipped with preheating means,
The preheating means includes
When the preheating means moves to the preheating position, a preheating unit that faces the nozzle body and preheats the nozzle body;
A second refractory material that wraps a part other than the part facing the nozzle body of the preheating unit from the outside;
Pouring nozzle, characterized in that it is configured to have a second stainless cover enclosing said second refractory material from the outside. A refractory container surrounding a storage space capable of storing molten metal;
The pouring nozzle according to claim 1 , wherein the pouring nozzle is connected to the bottom of the refractory container.
A continuous casting apparatus characterized by comprising: A first support plate fixed to the bottom of the refractory container while surrounding the first stainless steel cover of the support seat provided in the pouring nozzle from the outside;
A plurality of second support plates fixed to the outside of the first stainless steel cover of the support seat;
A plurality of fixing screws respectively corresponding to the respective second support plates and penetrating through the corresponding second support plates and then screwed into the first support plates; The continuous casting apparatus according to claim 2 .

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