JP5463842B2 - Long nozzle support holder for continuous casting - Google Patents

Description

  The present invention relates to a long nozzle support holder to which a long nozzle is attached when molten steel is poured into a tundish from a ladle using a long nozzle in continuous casting.

  In the continuous casting, as shown in FIG. 1, when pouring the molten steel 10 into the tundish 14 from the ladle 11, the upper end of a refractory nozzle called a long nozzle (also called an air seal pipe) 13 is placed on the ladle 10. It is attached to the molten steel pouring spout (sliding nozzle) 12 at the bottom, and the hot water is poured in a state where the lower end of the long nozzle 13 is immersed in the molten steel in the tundish 14.

  When the molten steel 10 in the ladle 11 runs out, the long nozzle 13 is removed from the sliding nozzle 12 at the bottom of the ladle 11, and the molten steel is filled from the ladle where the ladle 11 is emptied by a swing tower (not shown). The long nozzle 13 is mounted on the sliding nozzle 12 at the bottom of the ladle 11 again, and the molten steel 10 is poured into the tundish 14. Thereby, it can cast continuously and quality and productivity can be improved.

  As described above, when the long nozzle 13 is attached to or removed from the sliding nozzle 12 at the bottom of the ladle 11, the long nozzle attaching / detaching device 15 is used (see, for example, Patent Documents 1 to 3).

  At that time, as shown in FIGS. 1 and 2, the long nozzle 13 is usually mounted on the long nozzle support holder 20 at its upper end, and the long nozzle support holder 20 is the tip of the arm 15 a of the long nozzle attaching / detaching device 15. Set to the part (receiving part) 15b. 2A is a side view, FIG. 2B is a front view, and FIG. 2C is a top view.

  Here, as shown in FIG. 1, the long nozzle attaching / detaching device 15 functions as a long nozzle supporting device for supporting the long nozzle 13 in that state after the long nozzle 13 is mounted on the sliding nozzle 12 at the bottom of the ladle 11. .

  At this time, the long nozzle support holder 20 is set in the receiving portion 15b of the long nozzle attaching / detaching device (long nozzle supporting device) 15 and is moved in the horizontal direction by the horizontal movement of the long nozzle attaching / detaching device 15, and the receiving portion 15b. It can be rotated in the vertical direction using as a rotation fulcrum. The long nozzle support holder 20 has a structure that allows the long nozzle 13 to rotate in the horizontal direction with the central axis of the long nozzle 13 as a rotation axis.

  When the molten steel 10 is poured from the ladle 11 into the tundish 14 under the above-described configuration, the pouring amount (pouring amount) to the tundish 14 is controlled by the horizontal movement of the sliding nozzle 12 at the bottom of the ladle 11. . At that time, since the upper end of the long nozzle 13 is attached to the sliding nozzle 12, it always moves in the horizontal direction following the horizontal movement of the sliding nozzle 12 during operation (during pouring). Moreover, in order to pour the molten steel 10 in the ladle 11 onto the tundish 14 as much as possible, a technique is used in which the ladle 11 is tilted and set on a swing tower, or the ladle 11 is tilted during operation ( For example, see Patent Documents 4 and 5). Along with this, the sliding nozzle 12 at the bottom of the ladle 11 is also inclined.

  In this case, the long nozzle 13 must follow the movement of the sliding nozzle 12 that always moves horizontally and tilts. If the long nozzle 13 cannot follow the movement of the sliding nozzle 12, a gap is generated on the fitting surface between the long nozzle 13 and the sliding nozzle 12, causing a serious trouble such as the molten steel 10 being scattered around.

  Therefore, in order to ensure the followability of the long nozzle 13 with respect to the sliding nozzle 12, the long nozzle support holder 20 and the long nozzle support device 15 absorb changes in the movement of the sliding nozzle 12.

  When the moving direction of the sliding nozzle 12, the tilting direction of the sliding nozzle 12, and the support direction of the long nozzle 13 coincide, the following direction of the long nozzle 13 with respect to the sliding nozzle 12 is one direction. The movement of the sliding nozzle 12 can be absorbed by the vertical rotational movement of the long nozzle support holder 20 in the receiving portion 15 b and the horizontal rotational movement in the long nozzle support holder 20.

  However, if the moving direction of the sliding nozzle 12 does not coincide with the inclination direction of the sliding nozzle 12 and the support direction of the long nozzle 13, the movement (inclination) of the sliding nozzle 12 is absorbed in the long nozzle support holder 20. There is a need.

  Therefore, a sliding nozzle is installed in the long nozzle support holder 20 by installing a spherical seat structure combining a convex spherical seat and a concave spherical seat, a spherical bearing combining a convex spherical seat and a steel ball, or the like. The long nozzle 13 can be tilted following the movement of 12.

JP 2005-186144 A JP 2005-254257 A JP 09-201657 A Japanese Utility Model Publication No. 05-04358 Japanese Utility Model Publication No. 2000-079450

  However, in the long nozzle support holder, a spherical seat structure that combines a convex spherical seat and a concave spherical seat, or a spherical bearing that combines a convex spherical seat and a steel ball, can be installed to move the sliding nozzle. If the long nozzle can be tilted by following, there are the following problems.

  First, in the case of the spherical seat structure, mobility is obtained, but since the spherical seats (the convex spherical seat and the concave spherical seat) are in surface contact, the sliding resistance is large. There is a lot of dust around the long nozzle attaching / detaching device in continuous casting, and this dust enters the contact surface between the spherical seats, resulting in a large sliding resistance. In addition, since the long nozzle is operated after the temperature is raised to about 1000 ° C. with the long nozzle support holder attached, the long nozzle support holder becomes extremely hot, and the spherical seats are seized and sliding resistance and Become. Lubricating with oils and fats is not possible due to high ambient temperature and fire.

  On the other hand, in the case of spherical bearings, the sliding resistance is small because it is a point contact between a convex spherical seat and a steel ball, but as mentioned above, there is a lot of dust around the long nozzle attaching / detaching device in continuous casting. In addition, the dust caught in the spherical bearing becomes a resistance, and the trouble that the long nozzle cannot follow the movement of the sliding nozzle occurs. Moreover, the spherical bearings have a very short life due to the dust that has been caught.

  The present invention has been made in view of the circumstances as described above. In continuous casting, when pouring molten steel from a ladle into a tundish using a long nozzle, a long nozzle support to which the long nozzle is mounted is provided. It is an object of the present invention to provide a long nozzle support holder for continuous casting that has a structure in which the long nozzle can smoothly follow the movement of the sliding nozzle at the bottom of the ladle and has a long life.

  In order to solve the above problems, the present invention has the following features.

  [1] In continuous casting, when pouring molten steel from a ladle into a tundish using a long nozzle, a long nozzle support holder for continuous casting to which the long nozzle is mounted, and having a convex spherical seat inside A long-nozzle support holder for continuous casting, characterized in that a spherical bearing combining a steel ball and a steel ball is installed, and air spraying means for spraying air onto the spherical bearing is provided.

  [2] The continuous casting long according to [1], wherein the air spraying means includes a slit nozzle ring in which a slit nozzle for spraying air onto the spherical bearing is formed. Nozzle support holder.

  [3] The long nozzle support holder for continuous casting according to [2], wherein the slit nozzle ring is detachable.

  In the present invention, when pouring molten steel from the ladle into the tundish using the long nozzle, the long nozzle smoothly follows the movement of the sliding nozzle at the bottom of the ladle as a long nozzle support holder to which the long nozzle is mounted. It is possible to provide a long nozzle support holder having a long structure and a long life.

  That is, the long nozzle support holder of the present invention has a spherical bearing in which a convex spherical seat and a steel ball are combined inside, so that sliding resistance is generated by point contact between the convex spherical seat and the steel ball. Since it is small, the long nozzle can smoothly follow the movement of the sliding nozzle. Since the air bearing means for spraying air on the spherical bearing is provided, the air purge effect by the sprayed air can suppress the mixing of dust into the spherical bearing and the cooling effect by the sprayed air. Therefore, it is possible to prevent the spherical bearing from being seized.

It is a figure which shows the state which is pouring molten steel in a tundish from a ladle. It is a figure which shows the state with which the long nozzle was mounted | worn with the long nozzle support holder. It is a figure which shows the long nozzle support holder which concerns on one Embodiment of this invention.

  An embodiment of the present invention will be described with reference to the drawings.

  In one embodiment of the present invention, the state of pouring molten steel from the ladle into the tundish using the long nozzle is the same as that shown in FIG.

  That is, as shown in FIG. 1, when pouring the molten steel 10 into the tundish 14 from the ladle 11, the upper end of the long nozzle 13 is attached to the sliding nozzle 12 at the bottom of the ladle 10, and the lower end of the long nozzle 13 is connected to the tundish. 14 is poured in a state immersed in the molten steel in 14.

  When the molten steel 10 in the ladle 11 runs out, the long nozzle 13 is removed from the sliding nozzle 12 at the bottom of the ladle 11, and the molten steel is filled from the ladle where the ladle 11 is emptied by a swing tower (not shown). The ladle is replaced, and the long nozzle 13 is again attached to the sliding nozzle 12 at the bottom of the ladle 11, and the molten steel 10 is poured into the tundish 14. Thereby, it can cast continuously and quality and productivity can be improved.

  Thus, when the long nozzle 13 is attached to or removed from the sliding nozzle 12 at the bottom of the ladle 11, the long nozzle attaching / detaching device 15 is used.

  At that time, as shown in FIGS. 1 and 2, the long nozzle 13 has its upper end mounted on the long nozzle support holder 20, and the long nozzle support holder 20 is the tip of the arm 15 a of the long nozzle attaching / detaching device 15. (Receiver) Set to 15b.

  Here, as shown in FIG. 1, the long nozzle attaching / detaching device 15 functions as a long nozzle supporting device for supporting the long nozzle 13 in that state after the long nozzle 13 is mounted on the sliding nozzle 12 at the bottom of the ladle 11. .

  At this time, the long nozzle support holder 20 is set in the receiving portion 15b of the long nozzle attaching / detaching device (long nozzle supporting device) 15 and is moved in the horizontal direction by the horizontal movement of the long nozzle attaching / detaching device 15, and the receiving portion 15b. It can be rotated in the vertical direction using as a rotation fulcrum.

  In addition, in this embodiment, the long nozzle support holder 20 is a long nozzle support holder 20A having a structure as shown in FIG.

  That is, as shown in FIG. 3, the long nozzle support holder 20 </ b> A according to this embodiment includes a support holder main body 21 positioned on the outer peripheral side and placed on the receiving portion 15 b of the long nozzle attaching / detaching device 15, and an inner peripheral And a long nozzle mounting member 24 to which the long nozzle 13 is directly mounted, and a convex spherical seat 26 and a steel ball between the support holder main body 21 and the long nozzle mounting member 24. And a slit nozzle ring 30 in which a slit nozzle (slit hole) 31 for spraying air onto the spherical bearing 25 is formed.

  Here, the convex spherical seat 26 of the spherical bearing 25 is a ring-shaped spherical seat having a spherical surface 26 a that is convex obliquely downward, and the convex spherical surface 26 a is the center of the long nozzle 13. It is a spherical surface having a radius of curvature R around a point O on the line 13a extending upward from the axis (that is, the central axis of the long nozzle support holder 20A). The convex spherical seat 26 is fixed to the outer surface of the long nozzle mounting member 24.

  In addition, a plurality of (for example, 20) steel balls 27 of the spherical bearing 25 are arranged along the circumferential direction of the long nozzle support holder 20A, and are in contact with the convex spherical surface 26a of the spherical seat 26, respectively. It is supported by the slit nozzle ring 30 from below.

  As a result, when the sliding nozzle 12 is inclined due to the inclination of the ladle 11, the long nozzle mounting member 24 that directly supports the long nozzle 13 is inclined with respect to the support holder main body 21 by the action of the spherical bearing 25. be able to. Further, the long nozzle mounting member 24 rotates in the horizontal direction with respect to the support holder main body 21 with the center axis of the long nozzle 13 (that is, the center axis of the long nozzle support holder 20A) as the rotation axis by the action of the spherical bearing 25. can do.

  In addition, a plurality of (for example, 20) slit nozzles (slit holes) 31 of the slit nozzle ring 30 are provided corresponding to the positions where the steel balls 27 of the spherical bearing 25 are arranged. It is connected to an air flow path 22 and a nozzle header 23 formed in the support holder main body 21.

  Thereby, the air supplied via the air flow path 22 and the nozzle header 23 can be sprayed from the slit nozzle 31 toward the spherical bearing 25.

  In addition, it is preferable to periodically clean the slit nozzle 31 and the nozzle header 23 so that the slit nozzle 31 of the slit nozzle ring 30 is not clogged with dust and the air spraying state is not deteriorated.

  Therefore, the slit nozzle ring 30 can be attached to and detached from the support holder main body 21, thereby cleaning the slit nozzle 31, the nozzle header 23, etc. with the slit nozzle ring 30 removed from the support holder main body 21. Since the work can be performed, the efficiency of the cleaning work can be increased.

  Thus, the long nozzle support holder 20A according to this embodiment includes a support holder body 21 placed on the receiving portion 15b of the long nozzle attaching / detaching device 15 and a long nozzle mounting member 24 to which the long nozzle 13 is directly mounted. Since a spherical bearing 25 in which a convex spherical seat 26 and a steel ball 27 are combined is installed between the convex spherical seat 26 and the steel ball 27, the sliding resistance is small due to the point contact between the convex spherical seat and the steel ball. The long nozzle 13 mounted on the nozzle mounting member 24 can smoothly follow the movement of the sliding nozzle 12.

  Since the air can be sprayed from the slit nozzle 31 toward the spherical bearing 25, the air purge effect by the sprayed air can prevent the dust from entering the spherical bearing 25 and Since the spherical bearing 25 can be prevented from seizing due to the cooling effect by the air, the life is long.

  Therefore, in this embodiment, when the molten steel 10 is poured into the tundish 14 from the ladle 11 using the long nozzle 13, the long nozzle 13 is used as the long nozzle support holder 20 to which the long nozzle 13 is mounted. 11 A long nozzle support holder 20A having a structure that can smoothly follow the movement of the sliding nozzle 12 at the bottom and a long life can be provided.

DESCRIPTION OF SYMBOLS 10 Molten steel 11 Ladle 12 Sliding nozzle 13 Long nozzle 13a Center axis of long nozzle 14 Tundish 15 Long nozzle attaching / detaching device (long nozzle supporting device)
15a Arm of long nozzle attachment / detachment device 15b Receiving part of long nozzle attachment / detachment device 20 Long nozzle support holder 20A Long nozzle support holder 21 Support holder body 21
22 Air flow path 23 Nozzle header 24 Long nozzle mounting member 25 Spherical bearing 26 Convex spherical seat 26a Spherical spherical seat 27 Steel ball 30 Slit nozzle 31 Slit nozzle ring

Claims (3)

In continuous casting, when pouring molten steel from the ladle into the tundish using a long nozzle, it is a long nozzle support holder for continuous casting to which the long nozzle is mounted. A support holder main body placed on the apparatus and a long nozzle mounting member that is positioned on the inner peripheral side and on which the long nozzle is directly mounted, and has a convex between the support holder main body and the long nozzle mounting member. A spherical bearing in which a ring-shaped spherical seat having a spherical surface and a plurality of steel balls in contact with the convex spherical surface of the ring-shaped spherical seat are installed, and air is sprayed onto the spherical bearing. A long nozzle support holder for continuous casting, comprising air spraying means.   The long nozzle support holder for continuous casting according to claim 1, wherein the air spraying means has a slit nozzle ring in which a slit nozzle for spraying air onto the spherical bearing is formed.   The long nozzle support holder for continuous casting according to claim 2, wherein the slit nozzle ring is detachable.

Images