JP2002283046A - Nozzle holder, and nozzle fitting method thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nozzle holder for fitting a nozzle to a sliding nozzle device capable of reliably preventing any opening between faces of a plate brick and the nozzle and ensuring the uniform pressing force. SOLUTION: In this nozzle holder, a lower nozzle is screwed and tightened to, and held by a nozzle storage cylinder provided on the sliding nozzle device via bayonet mechanism. The nozzle holder comprises a holder body and an upper ring fitted to the holder body via an elastic body, and the minimum distance in the vertical direction between the upper ring and the holder body is 1/4 to 3/4 of the total deflection of the elastic body. When the holder is screwed to the nozzle storage cylinder and firmly tightened, the elastic body is sufficiently compressed, and a tip of the block is brought into contact with a bottom of a recess of the holder body.

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a nozzle holder for mounting a nozzle to a sliding nozzle device for a molten metal container.

2. Description of the Related Art Sliding nozzle devices provided in various molten metal containers are widely used because they can accurately control the flow rate of molten metal. Generally, two or three plate bricks are used in this sliding nozzle device, and a nozzle such as a lower nozzle, a dipping nozzle, or a long nozzle is joined to the lower surface of the lowermost plate brick. Generally, as shown in FIGS. 5 and 6, the lower nozzle 20 is tightened by the nozzle housing cylinder 16 provided in the opening and closing metal frame 15 of the sliding nozzle device 14 and the nozzle holder 1 screwed to the bayonet mechanism 17. Fixed. In FIG. 6, a spiral groove is formed on the inner surface of the nozzle housing cylinder 16, and the nozzle holder 1 is provided with three projections screwed into the spiral groove of the housing cylinder. When mounting the lower nozzle, the nozzle holder 1
With the lower nosnol 20 stored in the nozzle holder 1, the three protrusions 7 of the nozzle holder are fitted into the three spiral grooves of the nozzle storage tube 16 and rotated in a predetermined direction to rotate the nozzle holder 1.
Is screwed into the nozzle housing 16. Thereby, since the tip end face of the nozzle holder 1 presses the jaw of the lower nozzle 20, the lower nozzle 20 can be pressed strongly against the plate brick. In general, the joint surface between the plate brick and the lower nozzle is filled with a joint material such as mortar or a sealing material to prevent air from being sucked from gaps and leakage of molten metal. However, when used repeatedly,
A gap may be generated between the surfaces due to shrinkage of the joint material between the surfaces or expansion and contraction of the surrounding refractory or metal. Then, air may be sucked in from the gap or molten metal may leak, which is extremely dangerous. Further, since the gaps cause the restraining force of the contact portion between the nozzle housing cylinder and the nozzle holder to be lost, the nozzle holder may loosen and fall with the lower nozzle. In order to prevent this, the present applicant has previously disclosed in Japanese Patent Application Laid-Open No. 10-58124 a structure for preventing a gap between a surface where an elastic ring is mounted between a jaw portion of a lower nozzle and a tip end surface of a nozzle holder. Was disclosed. Thereby, even if the joint material between the surfaces contracts or a gap is generated due to expansion and contraction of the surrounding refractory or metal, the generation of the gap can be prevented by the urging force of the elastic ring. However, in this structure, the force received from the lower nozzle is directly received by the elastic ring, and if a force greater than the repulsive force of the elastic ring is applied to the elastic ring after the nozzle is set, a gap may be generated between the surfaces. . In addition, there is also a problem that the elastic ring has a large diameter, so that the elastic ring is likely to be distorted by heat, and the pressing force against the lower nozzle becomes non-uniform, so that the surface is easily opened.

SUMMARY OF THE INVENTION An object of the present invention is to provide a nozzle holder for mounting a nozzle to a sliding nozzle device, in which the opening between the plate brick and the nozzle surface is reliably prevented and uniform. An object of the present invention is to provide a nozzle holder capable of obtaining a high pressing force.

According to the present invention, there is provided a nozzle holder for screwing and holding a lower nozzle by a bayonet mechanism in a nozzle accommodating cylinder provided in a sliding nozzle device, and the nozzle holder comprises a holder main body. And an upper ring mounted on the holder body via an elastic body. The minimum vertical distance between the upper ring and the holder body is 1/4 to 3/3 of the total flexure of the elastic body.
4. On the holder body, a plurality of pins are provided on the upper surface, and an elastic body is arranged around the pins,
A structure in which a receiving hole in which the pin is loosely fitted in the upper ring is formed. In the case of the present invention, at the stage where the holder is screwed into the nozzle accommodating cylinder and strongly tightened, the elastic body is in a sufficiently compressed state, and the tip of the block comes into contact with the bottom of the concave portion of the holder body. In other words, although the urging force is generated in the nozzle in the upward direction, even if a large force is generated from above, the elastic body is not further compressed by the block. This allows the gap between the nozzle and the plate to be generated due to the repulsive force of the disc spring when the gap is opened or the holder is loosened due to repeated thermal expansion or thermal stress when the molten steel is actually used. Can be suppressed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In FIG. 1 showing the external side view of the present invention and FIG. 2 viewed from the top, a nozzle holder 1 according to the present invention has a cylindrical holder main body 2 and a holder main body 2 via a disc spring 4 as an elastic body.
And an upper ring 3 provided thereon. Reference numeral 5 denotes a handle used when tightening the nozzle holder. Reference numeral 6 shown in FIG. 2 indicates pins provided at four locations on the upper surface of the holder body 2. Reference numeral 7 denotes a projection formed on the side surface of the holder body 2 for screwing into a groove of the nozzle housing cylinder shown in the conventional example of FIG. FIG. 3 shows a longitudinal sectional view of the nozzle holder. As shown in the drawing, a disc spring 4 penetrates the pin 6, and the tip of the pin 6 is loosely fitted in a receiving hole 8 formed on the lower surface of the peripheral wall of the upper ring. The receiving hole 8 is formed at a sufficient depth so that the tip of the pin 6 does not hit the inner ceiling of the receiving hole 8 even when the upper ring 3 is lowered. As the elastic body penetrating around the pin 6, a coil spring, a leaf spring, or the like can be used in addition to the disc spring. The outer diameter of the elastic body is appropriately around the thickness t of the peripheral wall on the upper part of the holder body, and specifically, is within t ± 3 mm. In the case below this, the resilience of the elastic body becomes small, so that it is necessary to increase the number of pins used, which is economically wasteful. On the other hand, if it is larger than this, a large gap is required between the nozzle holder main body and the nozzle housing cylinder, so that the whole becomes large. By providing a relatively small elastic body at a plurality of locations in this way, there is an advantage that even if a part is distorted due to heat, the influence on the whole is reduced. Reference numeral 9 denotes a downwardly extending locking block provided on the lower surface of the upper ring 3, which is fitted into a concave portion 10 formed on the upper surface of the holder body 2. FIG.
3 is a vertical cross-sectional view taken along line AA of FIG. As shown in the figure, a through hole 11 having a step is formed in the locking block 9, a bolt 12 is inserted into the through hole 11, and a neck of the bolt 12 is seated on the step of the through hole 11. , And is screwed into the screw hole 13 of the holder body. The locking block 9 is used in the same manner as the conventional example shown in FIG. 6 to receive a frictional force with the nozzle and a rotational force generated by the rotation of the holder body when the nozzle holder is mounted on the nozzle storage tube. I do. That is, this rotation force cannot be received only by the pins 6. Reference numeral 12 denotes a bolt for fixing the upper ring 3 so as not to come off the holder main body 2. Recess 10 formed on the top surface of the locking block 9 and the top surface of the holder body
, That is, the minimum vertical distance between the upper ring and the holder body is determined according to the amount of deflection of the spring in consideration of the pressing force. Specifically, １ ／ to ／ of the total deflection of the spring is preferable. If it is less than 1/4, the generated repulsive force is small and the displacement is small, so that it cannot follow the thermal expansion and contraction of the joints insufficiently. It is because it becomes. Further, the gap between the side surface of the locking block 9 and the side surface of the concave portion 10 in the rotation direction is preferably set to be smaller than the gap between the side surface of the pin 6 on the upper surface of the holder and the receiving hole 8 of the upper ring. Specifically, 0.5 to 3 mm is preferable. If it is less than 0.5 mm, it may come into contact due to slight deformation during use, and sufficient repulsion may not be obtained. If it exceeds 3 mm, the hole diameter of the upper ring becomes large, so the upper ring 3 moves The spring 4 may be distorted or the upper ring 3 may come into contact with the nozzle housing cylinder shown in FIGS. 5 and 6, which may impair the function. The mounting of the nozzle using the nozzle holder of the present invention is performed in the same manner as in the case of the conventional nozzle holder shown in FIGS.

According to the holder of the present invention, in the initial tightening state, as long as the metal itself is not deformed, the surface does not act to open the surface against an external force greater than the repulsive force of the elastic body.
Therefore, even if the resilience of the elastic body is lost due to the high temperature or the life, the surface does not open. In addition, when the joints are displaced to open due to thermal expansion or contraction of the joint material, the joints follow the displacement contracted by the force of the elastic body, maintain a constant pressing force, and do not open between the surfaces. In addition, since the repulsive force of the elastic body at this time is determined only by the position of the holder body and the upper ring, it is constant without being affected by the variation in dimensional accuracy of the lower nozzle and the plate brick, and the friction coefficient of the bayonet groove is maintained. It is not affected by changes in

[Brief description of the drawings]

FIG. 1 is a side view showing the appearance of a nozzle holder according to the present invention.

FIG. 2 is a diagram of FIG. 1 as viewed from above.

3 shows a longitudinal sectional view of the nozzle holder according to the invention shown in FIG.

FIG. 4 is a longitudinal sectional view taken along line AA of FIG. 2;

FIG. 5 shows a state in which a lower nozzle is attached to a conventional sliding nozzle.

FIG. 6 shows how to attach a lower nozzle to a conventional sliding nozzle.

[Explanation of symbols]

1 Nozzle holder 2 Holder body 3
Upper ring 4 Disc spring 5 Handle 6 Pin 7
Projection for screwing 8 Receiving hole 9 Locking block 10 Recess formed in upper peripheral surface of holder body 11 Through hole of locking block 12 Bolt 13 Screw hole of holder body 14 Sliding nozzle device 15 Opening / closing frame 16 Nozzle storage cylinder 17 Piot Net mechanism 20 nozzle

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Akira Otsuka 1-1, Higashihama-cho, Yawatanishi-ku, Kitakyushu-shi, Fukuoka F-term in Kurosaki-Harima Co., Ltd. (reference) 4E004 FA10 4E014 MA01 MA07 MA16

Claims (4)

[Claims] 1. A nozzle holder for screwing and holding a lower nozzle by a bayonet mechanism in a nozzle storage cylinder provided in a sliding nozzle device, the nozzle holder comprising a holder main body and an elastic body provided on the holder main body. A nozzle holder comprising an upper ring mounted through the upper ring, wherein a minimum vertical distance between the upper ring and the holder body is 1/4 to 3/4 of a total deflection amount of the elastic body. 2. The nozzle holder according to claim 1, wherein a plurality of pins are provided on an upper surface of the holder body, an elastic body is arranged around the pins, and a receiving hole in which the pins are loosely fitted is formed in the upper ring. 3. The nozzle holder according to claim 1, wherein a block is provided on one of the holder main body and the upper ring, and a recess is provided on the other of the holder body and the upper ring. 4. A nozzle holder for holding a nozzle in a sliding nozzle device by a bayonet mechanism, wherein an upper ring is mounted on the holder body via an elastic body, and a minimum vertical distance between the upper ring and the holder body is provided. A method of mounting a nozzle using a nozzle holder having a distance of 1/4 to 3/4 of a total flexure amount of an elastic body. When mounting the nozzle, tighten the nozzle holder until the upper ring contacts the nozzle body. How to install the nozzle.