JPH0550196A - Device for holding immersion nozzle - Google Patents

Abstract

PURPOSE:To provide a holding device for immersion nozzle having small size and simple configuration. CONSTITUTION:A trunnion shaft 7a is provided projectingly to a nozzle holder 7. The trunnion shaft 7a is supported with tip part of an arm 9 and base part of the arm 9 is held to a hardware 4 in a lower plate 3 moveably in vertical direction through a spring 10a. Center part of the arm 9 is held with a lifting bolt 12 arranged in the supporting hardware 4 and a cap nut 13 screwed with this.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for holding a dipping nozzle constituting a continuous casting device on a slide gate.

[0002]

2. Description of the Related Art In a continuous casting apparatus, a slide gate and a dipping nozzle are commonly used as a method for injecting molten steel from a tundish into a mold. In this slide gate, the refractory plate that controls the molten steel flow rate and the immersion nozzle that guides the molten steel controlled by this refractory plate to the mold have different chemical components due to different purposes and purposes, and they are molded and processed separately. It is then assembled and used at the site of continuous casting. The assembly at this time is generally mechanically tightened with a screw or a cotter through a joint material.

In the continuous casting operation, the temperature of the metal and refractory around the submerged nozzle mounting portion changes with time from the start of preheating of the tundish and the start of pouring to the end of pouring. That is, since the initial temperature rise of the refractory material precedes the metal material, the cushioning property of the joint material is impaired,
Creep occurs in the lower plate or immersion nozzle. Then, with the passage of time, the refractory is heated to the surface, the temperature of the immersion nozzle holding metal also rises accordingly, and this time, the holding power of the immersion nozzle weakens due to the difference in the linear expansion coefficient of the metal and the refractory, and In this case, the holding force is lost and a gap is created between the immersion nozzle and the lower part of the lower plate.

When a gap is created, air is sucked in through the gap, the molten steel is oxidized, Al ₂ O ₃ is generated by the combination of Al and oxygen in the steel, and Al ₂ O ₃ is deposited inside the immersion nozzle to form a high temperature refractory and oxygen. Abnormal wear of refractory due to reaction and accompanying leakage steel,
It will cause operational obstacles. Therefore, in normal operation, the immersion nozzle is checked for looseness and retightened at regular intervals.

As a countermeasure against such a change in tightening force over time (including loss of tightening force), a hydraulic holding type, pneumatic holding type, spring holding type, or other immersion nozzle holding mechanism has been considered.

[0006]

By the way, among the above-mentioned submerged nozzle holding mechanisms, the hydraulic or pneumatic type requires a power source of hydraulic pressure or compressed air. A backup function is required to hold the immersion nozzle safely even if the supply hose is damaged or falls off.

In addition, although the spring type does not require a backup function, it requires a guide post for raising or lowering or turning, so that the equipment height is high and there is a drawback that it interferes with work around the continuous casting mold. there were.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a submerged nozzle holding device which utilizes the advantages of a spring type and has a small size and a simple structure.

[0009]

In order to achieve the above object, the immersion nozzle holding device according to the present invention is a device for holding a submerged nozzle of a continuous casting device on a slide gate, in which a trunnion shaft is projectingly provided on a nozzle holder. Then, the base end of the arm that supports the trunnion shaft at the tip is held by a support metal of a lower plate that constitutes a slide gate movably in the vertical direction via a spring. The directional position adjusting member is provided in a suspended manner, and furthermore, the turning mechanism is provided between the support metal member of the lower plate and the arm.

[0010]

In the immersion nozzle holding apparatus according to the present invention, the immersion nozzle is held by the vertically movable arm whose base end is biased by the spring and the vertical position adjusting member of the arm.

[0011]

EXAMPLES Hereinafter, the immersion nozzle holding device according to the present invention will be described.
Description will be made based on the embodiment shown in FIGS. 1 to 3 show a first embodiment of the present invention, FIGS. 4 and 5 show a second embodiment, FIG. 1 is a partial cross-sectional view, and FIGS. 2 and 4 are detailed cross-sections. 3 and 5 are views seen from below in FIGS. 2 and 4.

In the drawings, reference numeral 1 denotes a three-layer slide gate attached to a bottom iron shell 2 of a tundish, and a supporting metal 4 for a lower plate 3 constituting this slide gate 1.
The immersion nozzle holding device 5 according to the present invention is attached to the.

By the way, the immersion nozzle 6 is housed in the nozzle holder 7 and is crimped to the lower part of the lower plate 3 via the joint mortar 8 by the holding device, but the nozzle holder 7 is screwed to the supporting metal piece 4. In the holding device,
When the joint mortar 8 is compressed by the initial temperature rise of the refractory and then the temperature of the metal is increased and heated to near the temperature of the refractory, the expansion of the metal is larger, so the pressure of the joint mortar 8 is insufficient. Or create a gap in the mortar.

Therefore, in the present invention, the trunnion shaft 7a is provided on the outer peripheral portion of the nozzle holder 7, and the trunnion shaft 7a is supported by the tip of the arm 9. In the first embodiment shown in FIGS. 1 to 3, the arm 9 has its base end portion attached to the swivel base 14 by using a pin 11 so as to be vertically movable. A spring 10 for urging the base end side of the arm 9 downward is provided at the end portion.
A spring case 10 having a inside is provided.
In addition, the central portion of the arm 9 is also attached to the swivel base 14 by a lifting bolt 12 and a cap nut 13, which are vertical position adjusting members of the arm 9. In the present embodiment, the head of the lifting bolt 12 has a planar rectangular shape,
Moreover, by making the neck part spherical, it is possible to facilitate the vertical movement of the arm 9 and prevent the arm 9 from co-rotating with the cap nut 13.
The work is facilitated.

The swivel base 14 is swivelably installed by a clamper 15 provided on the upper surface thereof to a swivel pedestal 16 which is assembled to a base 17 mounted on the lower surface of the metal support 4, and is provided at the rear end of the swivel base 16. Is, for example, a small plate-shaped long hole 14
A is provided, and the pin 11 is inserted into the elongated hole 14a to position the arm 9.

Reference numeral 18 denotes a swivel positioning guide of the arm 9, which is attached to the support metal 4 of the lower plate 3 for the purpose of easily positioning the immersion nozzle 6 and the lower plate 3. Further, 19 is a bolt that regulates the lowering limit of the arm 9, and connects the swivel base 14 and the arm 9.

The first embodiment of the present invention is constructed as described above, and when the cap nut 13 is rotated to tighten the screw, the spring 10a is compressed and the dipping nozzle 6 passes through the joint mortar 8 and the lower plate 3 is inserted. Is crimped to. Also,
When the screw is loosened, the spring force of the spring 10a is released, and the swivel base 14 is also rotatable, so that the immersion nozzle 6 can be attached and detached.

The second embodiment shown in FIGS. 4 and 5 is the first embodiment described above.
The structure of the embodiment is simplified by omitting the turning function of the embodiment to further simplify and downsize. The lifting bolt 12 is hung by the pin 20 on the support metal 4 of the lower plate 3 to hold the spring 10a. The spring 21a and the screw shaft 22 prevent the spring 10a from separating from the arm 9 and falling apart. In the second embodiment, the bolt 19 'for restricting the lowering limit of the arm 9 is attached to the supporting metal member 4 in a suspended manner.

As described above, the immersion nozzle holding device according to the present invention has the arm 9 for supporting the nozzle holder 7.
Is vertically movably supported by a lifting bolt 12 and a cap nut 13 in the central portion, and a spring 10a serving as a fulcrum is arranged at the base end. Sufficient stroke can be obtained for replacement. Moreover, in the middle of the lifting stroke of the arm 9, since the load acting on the lifting bolt 12 is only the weight of the immersion nozzle 6, the nozzle holder 7 and the arm 9, the lifting operation can be performed with a light load.

Further, in the first embodiment, since the swivel portion is formed into a disk shape, the overall height of the apparatus can be reduced and the space between the tundish and the mold of the continuous casting machine can be saved. If the base 17 is omitted, the overall height can be further reduced. Furthermore,
Since the spring 10a is located away from the high temperature portion such as the immersion nozzle 6, it is hardly affected by heat and can be used stably for a long period of time.

[0021]

As described above, according to the present invention, the small and simple immersion nozzle holding device allows the immersion nozzle to be always brought into close contact with the lower plate with a stable force. And operation troubles can be largely prevented.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of the first embodiment.

FIG. 2 is a cross-sectional view showing details of the first embodiment.

FIG. 3 is a view seen from below in FIG.

FIG. 4 is a sectional view showing details of a second embodiment.

FIG. 5 is a view as seen from below in FIG.

[Explanation of symbols]

 1 Slide Gate 3 Lower Plate 4 Support Hardware 5 Immersion Nozzle Holding Device 6 Immersion Nozzle 7 Nozzle Holder 7a Trunnion Shaft 9 Arm 10a Spring 12 Lifting Bolt 13 Cap Nut

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhisa Sato 1850 Minato, Wakayama, Wakayama Sumitomo Metal Industry Co., Ltd. Kashima Works Ltd. (72) Inventor Tadao Saigo 4-7 28 Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Sumitomo Heavy Industries Casting Co., Ltd. (72) Inventor Fuyuji Nishiyama 4-chome, Kitahama, Chuo-ku, Osaka 7-28 Sumitomo Heavy Industries Casting & Forging Co., Ltd.

Claims (2)

[Claims] 1. A device for holding a dipping nozzle of a continuous casting device on a slide gate, wherein a trunnion shaft is projectingly provided on a nozzle holder, and a base end of an arm for supporting the trunnion shaft at its tip is vertically moved via a spring. The apparatus for holding a dipping nozzle, which is movably held by a support metal of a lower plate which constitutes a slide gate, and further provided with a vertical position adjusting member of an arm on the support metal in a suspended manner. 2. Between the support hardware of the lower plate and the arm,
The immersion nozzle holding device according to claim 1, wherein a swivel mechanism is provided.