JP5037552B2 - NOZZLE FOR CONTINUOUS CASTING AND METHOD FOR FIXING GAS SUPPLY CONNECTION SCREW IN NOZZLE FOR CONTINUOUS CASTING - Google Patents

Description

  The present invention relates to a continuous casting nozzle to which a gas supply pipe connecting screw is fixed, and a method for fixing a gas supply pipe connecting screw in the continuous casting nozzle.

  Conventionally, in order to prevent components such as aluminum contained in the molten steel flowing through the nozzle bore during continuous casting from oxidizing and causing nozzle blockage, as shown in FIG. A gas introduction path (annular slit) 53 that is substantially concentric with the inner hole 52 and extends in the axial direction is formed, and an inert gas such as argon gas is passed through the gas introduction path 53 through the nozzle inner hole 52. In order to prevent the oxide from adhering to the inner hole, it is performed.

  The present applicant has previously filed an application for the gas supply pipe connection screw 54 for connecting the gas supply pipe 20 for supplying gas into the gas introduction path 53 to the side wall of the nozzle body 51, and this gas supply pipe connection. A screw structure is proposed in which the gas supply pipe connection screw 54 does not rotate when the gas supply pipe 20 is connected (screwed) to the screw 54 (Japanese Patent No. 3727632).

  By the way, when such a gas supply pipe connection screw 54 is attached to the nozzle body 51, the gas supply pipe connection screw 54 is directly attached to the screw attachment hole 55 of the nozzle body 51. However, the nozzle body 51 made of refractory is sheared. Since it does not have sufficient strength against stress, the nozzle body 51 may be destroyed when the gas supply pipe 20 is attached. In order to solve this problem, as shown in FIG. 8, the outer periphery of the nozzle body 51 in the vicinity of the portion to which the gas supply pipe connection screw 54 is attached is wound with an iron shell 56, and the iron shell 56 and the gas supply pipe connection screw 54 are May be fixed (fixed by welding 57).

However, if the continuous casting nozzle is heated during preheating or use, the iron shell 56 is also heated and expands in the radial direction, so that it is pulled by the iron shell 56 and the gas supply pipe connecting screw 54 is detached from the nozzle body 51. I had to do it. In addition, a crack occurred in the mortar for fixing the gas supply pipe connection screw 54, and gas sometimes leaked from the crack.
Japanese Patent No. 3727632

  Therefore, the problem of the present invention is that the nozzle body is not destroyed when the gas supply pipe is attached, the gas supply pipe connection screw is not detached from the nozzle body, and further the gas supply pipe connection Another object of the present invention is to provide a continuous casting nozzle in which a crack does not occur in a mortar for fixing a screw for use and gas leaks from that portion, and a method for fixing a screw for connecting a gas supply pipe in the continuous casting nozzle.

In order to solve the above problems, a gas introduction path provided in the nozzle body and capable of supplying gas to the nozzle bore and a gas supply pipe for supplying gas into the gas introduction path are connected to the nozzle body. A nozzle for continuous casting having a supply pipe connecting screw, wherein the nozzle main body in the vicinity of the attachment portion of the gas supply pipe connecting screw is wound with an iron shell, and the gas supply pipe connecting screw is The screw for connecting the gas supply pipe is held by a screw holding member having a screw insertion hole that can be inserted, the iron skin and the screw holding member are fixed, and further, the screw for connecting the gas supply pipe is a head. The head flange has a polygonal outer shape, and the screw insertion hole of the screw holding member is formed in a shape that makes the head flange non-rotatable. Continuous casting nozzle A.

Moreover, what solves the said subject is for connecting the gas supply path which is provided in a nozzle main body and can supply gas to a nozzle inner hole, and supplies the gas in this gas introduction path to a nozzle main body. The gas supply pipe connection screw is fixed to a continuous casting nozzle having a gas supply pipe connection screw, wherein an iron skin is wound around the nozzle body in the vicinity of the attachment portion of the gas supply pipe connection screw. The gas supply pipe connection screw is held by a screw holding member having a screw insertion hole into which the gas supply pipe connection screw can be inserted, and the iron skin and the screw holding member are fixed. Further, the gas supply pipe connecting screw has a head flange, the head flange is formed in a polygonal shape, and the screw insertion hole of the screw holding member makes the head flange non-rotatable. Shape to shape A method of fixing screws for the gas supply pipe connecting the continuous casting nozzle, characterized in that it is.

According to the first aspect of the invention, the nozzle body is not destroyed when the gas supply pipe is attached, the gas supply pipe connection screw is not detached from the nozzle body, and the gas It is possible to prevent cracks from occurring in the mortar for fixing the supply pipe connecting screw and leaking gas from the crack, and to further prevent the gas supply pipe connecting screw from rotating.

According to the invention described in claim 2 , the nozzle body is not destroyed when the gas supply pipe is attached, the gas supply pipe connection screw is not detached from the nozzle body, and further, the gas It is possible to prevent cracks from occurring in the mortar for fixing the supply pipe connecting screw and leaking gas from the crack, and to further prevent the gas supply pipe connecting screw from rotating.

It is a partial front schematic diagram for demonstrating the fixing method of the gas supply pipe connection screw in the nozzle for continuous casting of this invention. It is a top view of the member for screw holding used with the fixing method of the screw for gas supply pipe connection in the nozzle for continuous casting of the present invention. It is a partial front schematic diagram for demonstrating the fixing method of the gas supply pipe connection screw in the nozzle for continuous casting of this invention. FIG. 4 is a partial cross-sectional view taken along line AA in FIG. 3. It is a fragmentary longitudinal cross-sectional view for demonstrating the fixing method of the screw for gas supply pipe | tube connection in the nozzle for continuous casting of the other Example of this invention. It is a fragmentary longitudinal cross-sectional view for demonstrating the fixing method of the screw for gas supply pipe | tube connection in the nozzle for continuous casting of the other Example of this invention. It is a longitudinal cross-sectional view for demonstrating the nozzle for continuous casting which connects a gas supply pipe | tube. It is a fragmentary longitudinal cross-sectional view for demonstrating the fixing method of the gas supply pipe connection screw in the conventional nozzle for continuous casting.

  The present invention provides a gas supply pipe connection by means of a screw holding member having a screw insertion hole in which an iron skin is wound around a nozzle body in the vicinity of an attachment site of a gas supply pipe connection screw and a gas supply pipe connection screw can be inserted. When the gas supply pipe is attached, the nozzle main body is not destroyed, and the gas supply pipe connecting screw is used for the nozzle main body. In addition, a continuous casting nozzle has been realized in which the mortar for fixing the gas supply pipe connecting screw does not crack and the gas does not leak from that portion.

  As shown in FIG. 3 or FIG. 4, the continuous casting nozzle 1 of this embodiment includes a gas introduction path 4 provided in the nozzle body 2 and capable of supplying gas to the nozzle inner hole 3, and a gas introduction path 4. A nozzle for continuous casting having a gas supply pipe connection screw 5 for connecting a gas supply pipe 20 for supplying a gas to the nozzle main body 2, and a nozzle body in the vicinity of an attachment site of the gas supply pipe connection screw 5 2 is covered with an iron skin 6 and a screw holding member 9 having a screw insertion hole 8 into which the gas supply pipe connection screw 5 can be inserted. The flange 5a) is held, and the iron skin 6 and the screw holding member 9 are fixed. Hereinafter, each configuration will be described in detail.

  The continuous casting nozzle 1 is a nozzle for injecting molten metal in a tundish into a mold, and the upper part is hermetically connected to the molten steel discharge port of the tundish, and the lower part is inserted and immersed in the mold for use. Is.

  A nozzle inner hole 3 passes through the center of the nozzle body 2 in the axial direction, and the molten metal can be circulated through the nozzle inner hole 3. Further, a gas introduction path (annular slit) 4 is formed in the nozzle body 2 so as to be substantially concentric with the nozzle inner hole 3 and extending in the axial direction. By supplying an inert gas such as a gas to the nozzle inner hole 3, the oxide is prevented from adhering to the inner hole.

  A screw mounting hole 10 communicating with the gas introduction path 4 is formed in the side wall of the nozzle body 2, and a gas supply for supplying gas into the gas introduction path 4 is formed in the screw mounting hole 10 as shown in FIG. 4. A gas supply pipe connection screw 5 for connecting the pipe 20 to the nozzle body 2 is attached.

  More specifically, the screw mounting hole 10 includes a fitting hole 10a for fitting the flange 5a of the gas supply pipe connecting screw 5, and a male screw of the gas supply pipe connecting screw 5 that is continuous with the fitting hole 10a. It is comprised from the internal thread 10b which screws 5b.

  The gas supply pipe connecting screw 5 is formed by integrally forming a regular hexagonal flange 5a in plan view (see FIG. 1) on the screw main body portion 5c by forging or the like, and the gas supply hole 11 is passed through substantially the center of the screw main portion 5c. A gas supply pipe connecting female screw 5d is formed on the inner surface of the gas supply hole 11 and a male screw 5b is formed on the outer periphery of the screw body 5c. The apex angle of the regular hexagonal flange 5a constitutes a corner portion for rotation prevention.

  Then, a refractory mortar 12 is filled and cured in the gap between the flange 5a of the gas supply pipe connection screw 5 attached to the screw attachment hole 10 and the fitting hole 10a, as shown in FIG. 5 is fixed, and the gas supply pipe 20 is configured to be connectable to the continuous casting nozzle 1.

As shown in FIG. 1 or FIG. 4, an iron skin 6 is wound around the outer periphery of the nozzle body 2 in the vicinity of the attachment portion of the gas supply pipe connection screw 5, and the nozzle body 2 is destroyed when the gas supply pipe 20 is attached. It is reinforced so that it will not be.

  Further, as shown in FIG. 3, a screw holding member 9 (see FIG. 2) having a screw insertion hole 8 into which the head flange 5a of the gas supply pipe connecting screw 5 can be fitted is attached to the head flange 5a. Fitting (specifically, a regular hexagonal head flange 5 a is inserted into the screw fitting hole 8) and held, and the gas supply pipe connecting screw 5 is captured by the screw holding member 9. In addition, the screw insertion hole 8 of this embodiment is a regular hexagon having substantially the same dimension as the outer shape (regular hexagon) of the head flange 5a of the gas supply pipe connecting screw 5, but the same corresponding to the outer shape of the head flange 5a. When the outer shape of the head flange 5a is circular, the screw insertion hole 8 is also formed in a circle having substantially the same size.

  Further, as shown in FIG. 3 or FIG. 4, the continuous casting nozzle 1 is configured by welding and fixing an iron skin 6 and a screw holding member 9 at a plurality of welding portions 7.

  Thus, in the continuous casting nozzle 1 of the present invention, the iron skin 6 is wound around the nozzle body 2 in the vicinity of the attachment site of the gas supply pipe connection screw 5 and the head flange 5a of the gas supply pipe connection screw 5 is wound. The head flange 5a of the gas supply pipe connecting screw 5 is held by a screw holding member 9 having a screw insertion hole 8 into which the steel plate 6 and the screw holding member 9 are fixed. Therefore, the nozzle body 2 is not destroyed when the gas supply pipe 20 is attached, and the gas supply pipe connection screw 5 is detached from the nozzle body 2 even when the iron skin 6 expands in the radial direction. In addition, the mortar 12 for fixing the gas supply pipe connecting screw 5 is not cracked and gas does not leak from that portion. The head flange 5a of the gas supply pipe connection screw 5 is formed in a polygonal shape, while the screw insertion hole 8 of the screw holding member 9 is formed in a shape that prevents the head flange 5a from rotating. Therefore, the gas supply pipe connecting screw 5 is further prevented from rotating.

Next, another embodiment of the continuous casting nozzle of the present invention shown in FIG. 5 will be described.
The difference between the continuous casting nozzle 30 of this embodiment and the above-described continuous casting nozzle 1 is that the continuous casting nozzle 1 winds the iron skin 6 around the outer periphery of the nozzle body 2 and then the screw holding member 9 from above. On the other hand, the continuous casting nozzle 30 fits the screw holding member 9 into the screw insertion hole 8 of the flange 5a and then welds the nozzle body 2 to the flange 5a. It is only the point which wound the iron skin 6 on the outer periphery of, and welded both, and others are the same. The same components are denoted by the same reference numerals and description thereof is omitted. As described above, the continuous casting nozzle of the present invention broadly includes those in which both the iron skin and the screw holding member are fixed regardless of the upper layer lower layer relationship.

Further, another embodiment of the continuous casting nozzle of the present invention shown in FIG. 6 will be described.
The difference between the continuous casting nozzle 40 of this embodiment and the above-mentioned continuous casting nozzle 1 is that the screw holding member 9 of the continuous casting nozzle 1 is a plate-like body, whereas the continuous casting nozzle 40 The screw holding member 49 is a point formed in a cylindrical body, and thus the head flange 45a is screwed into the screw insertion hole by forming the screw holding member 49 in a cylindrical body (three-dimensional structure). When the screw holding member 49 is fixed (welded) to the iron skin 6 in a state of being inserted through the screw 8, the screw holding member 49 protrudes outward, and the gas supply pipe is fitted in all directions when the gas supply pipe is attached. Can be further suppressed, and the nozzle body can be prevented from being destroyed. As shown in FIG. 6, the screw holding member 49 of the continuous casting nozzle 40 has at least a head flange 45a protruding outward when the gas supply pipe connecting screw 45 is attached to the nozzle body 2. It is preferable to be configured in a cylindrical body having a height greater than the length to be.

Further, a method of fixing the gas supply pipe connecting screw in the continuous casting nozzle of the present invention will be described with reference to one embodiment shown in FIGS.
The fixing method of the gas supply pipe connection screw 5 in the continuous casting nozzle 1 of this embodiment is as follows: a gas introduction path 4 provided in the nozzle body 2 and capable of supplying gas to the nozzle inner hole 3; A gas supply pipe connection screw 5 in a continuous casting nozzle 1 having a gas supply pipe connection screw 5 for connecting a gas supply pipe 20 for supplying gas to the nozzle body 2, The nozzle body 2 near the attachment site of the supply pipe connection screw 5 is wound with an iron skin 6 and gas is supplied by a screw holding member 9 having a screw insertion hole 8 into which the gas supply pipe connection screw 5 can be inserted. This is a fixing method in which the head flange 5a of the pipe connecting screw 5 is held, and the iron skin 6 and the screw holding member 9 are fixed. Hereinafter, although each process is demonstrated, about each structure of the nozzle 1 for continuous casting, it is as above-mentioned, and description is abbreviate | omitted.

In this embodiment, first, as shown in FIG. 1, an iron skin 6 is wound around the outer periphery of the nozzle body 2 near the attachment site of the gas supply pipe connection screw 5, and the nozzle body 2 is attached when the gas supply pipe 20 is attached. It is reinforced so that it will not be destroyed.

  Next, a screw holding member 9 having a screw insertion hole 8 into which the head flange 5a of the gas supply pipe connecting screw 5 as shown in FIG. The flange 7 is fitted (specifically, a flange 5 a having a regular hexagonal shape is inserted into the screw insertion hole 8) and held, and the gas supply pipe connection screw 5 is captured by the screw holding member 9.

  Furthermore, as shown in FIG. 3 or FIG. 4, the iron skin 6 and the screw holding member 9 are welded and fixed by a plurality of welding portions 7.

  Thus, the fixing method of the gas supply pipe connection screw 5 in the continuous casting nozzle 1 of the present invention is that the iron skin 6 is wound around the nozzle body 2 near the attachment site of the gas supply pipe connection screw 5 and the gas The head flange 5a of the gas supply pipe connection screw 5 is held by a screw holding member 9 having a screw insertion hole 8 into which the supply pipe connection screw 5 can be inserted. Further, the iron skin 6 and the screw holding member 9 are provided. Since the nozzle body 2 is not broken when the gas supply pipe 20 is attached, the gas supply pipe connection screw 5 is not damaged when the iron skin 6 expands in the radial direction. The mortar 12 for fixing the gas supply pipe connecting screw 5 is not cracked and the gas does not leak from that portion without being detached from the main body 2. The head flange 5a of the gas supply pipe connection screw 5 is formed in a polygonal shape, while the screw insertion hole 8 of the screw holding member 9 is formed in a shape that prevents the head flange 5a from rotating. Therefore, the gas supply pipe connecting screw 5 can be further prevented from rotating. Furthermore, when the outer shape of the head flange 5a of the gas supply pipe connection screw 5 is formed in a polygonal shape, it is unclear at what angle the head flange 5 is fixed to the nozzle body 2; When the holding member 9 is attached, the screw insertion hole 8 and the head flange 5 may be engaged, and any angle of the head flange 5 fixed to the nozzle body 2 can be handled.

DESCRIPTION OF SYMBOLS 1 Nozzle for continuous casting 2 Nozzle main body 3 Nozzle inner hole 4 Gas introduction path 5 Gas supply pipe connection screw 5a Head flange 5b Male screw 5c Screw main body part 5d Gas supply pipe connection female screw 6 Iron 7 Welding part 8 Screw Insertion hole 9 Screw holding member 10 Screw mounting hole 10a Insertion hole 10b Female screw 11 Gas supply hole 12 Refractory mortar 20 Gas supply pipe

Claims (2)

A gas introduction path provided in the nozzle body and capable of supplying gas to the nozzle bore, and a gas supply pipe connection screw for connecting the gas supply pipe for supplying gas into the gas introduction path to the nozzle body. The nozzle for continuous casting, wherein the nozzle body in the vicinity of the attachment portion of the gas supply pipe connection screw is wound with an iron skin and has a screw insertion hole into which the gas supply pipe connection screw can be inserted. The screw for holding the gas supply pipe is held by the screw holding member, the iron skin and the screw holding member are fixed, and the gas supply pipe connecting screw has a head flange, The continuous flange has a polygonal outer shape, and the screw insertion hole of the screw holding member is formed in a shape that prevents the head flange from rotating . A gas introduction path provided in the nozzle body and capable of supplying gas to the nozzle bore, and a gas supply pipe connection screw for connecting the gas supply pipe for supplying gas into the gas introduction path to the nozzle body. A method for fixing the gas supply pipe connecting screw in the continuous casting nozzle, wherein an iron skin is wound around the nozzle body in the vicinity of the attachment portion of the gas supply pipe connecting screw, and the gas supply pipe connecting screw The screw for connecting the gas supply pipe is held by a screw holding member having a screw insertion hole into which the screw can be inserted, the iron skin and the screw holding member are fixed, and the gas supply pipe connecting screw is It has a head flange, and the head flange is formed in a polygonal shape, and the screw insertion hole of the screw holding member is formed in a shape that makes the head flange non-rotatable. Continuous Method of fixing screws for the gas supply pipe connecting the granulation nozzle.

Images