JP2678251B2 - Immersion nozzle holding device - Google Patents

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 uses and purposes, and they are molded and processed separately. It is assembled and used at the continuous casting site. In this case, the assembly is generally performed by mechanically tightening 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 casting until the end of casting. That is, since the initial temperature rise of the refractory material precedes the metal object, the cushioning property of the joint material is impaired,
Creep occurs in lower plate or submerged 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, this time, the holding power of the immersion nozzle is weakened due to the difference in the linear expansion coefficient of the metal and the refractory, 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 produced by the combination of Al and oxygen in the steel, and this is deposited in the immersion nozzle, where the high temperature refractory and oxygen are separated. Abnormal wear of refractory due to reaction and accompanying leakage steel, etc.
This will cause operational problems. For this reason, in normal operation, the immersion nozzle is checked for looseness and tightened at regular intervals.

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

[0006]

By the way, among the above-mentioned immersion 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 dropped.

Further, the spring type does not require a backup function, but since it requires a guide post for raising and lowering or turning, it has a high equipment height and has a drawback that it interferes with the 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, an immersion nozzle holding device according to the present invention is a device for holding an immersion nozzle of a continuous casting device on a slide gate, in which a trunnion shaft is projected from a nozzle holder. and, the proximal end of the arm for supporting the trunnion shaft at the tip, so as to be movable in the vertical direction via a spring, causes held on the support hardware of the lower plate constituting the sliding gate, the support of the lower plate between hardware and the arm, interposed the turning mechanism, further, with each other to the fact that the vertical position adjustment member of the arm is provided with suspended to allow swinging in multiple directions on the turning mechanism.

[0010]

In the immersion nozzle holding apparatus according to the present invention, the holding of the immersion nozzle, an arm capable <br/> moved in the vertical direction by urging the proximal end by a spring, and vertical position adjustment member of the arm To do.

[0011]

EXAMPLES Hereinafter, the immersion nozzle holding device according to the present invention will be described.
It will be described with reference to the embodiments shown in FIGS. 1 is a diagram showing a cross-sectional partially across, Figure 2 showing a cross-sectional detail, FIG. 3 is a view from below of Figure 2.

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

By the way, the submerged 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 metal temperature rises and is heated to near the refractory temperature, the expansion of the metal becomes larger, so the joint 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 so as to project from the outer peripheral portion of the nozzle holder 7, and the trunnion shaft 7a is supported by the tip of the arm 9. That is, the arm 9 is attached to the swivel base 14 by using the pin 11 so that the base end of the arm 9 can be moved in the vertical direction , and the base end of the arm 9 is attached to the base end attached by the pin 11. A spring case 10 in which a spring 10a for urging the side downward is provided is provided. In addition, the arm 9
The center 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 for the arm 9. In this embodiment, the head of the lifting bolt 12 so that the planar shape becomes rectangular, and the neck portion, i.e., the lower surface of the head, as shown in FIG. 2,
A little from the head of the lifting bolt 12 provided on the swivel base 14.
The elevation bolt 12 as the same spherical big head receiving portion by providing suspended from to allow swinging in multiple directions, as well as to facilitate vertical movement of the arm 9, the co-rotation of the cap nut 13 This is being done to facilitate work.

The swivel base 14 is rotatably 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 support metal 4, and is provided at the rear end thereof. elongated hole, for example a small stamp-type 14
a is provided, and the pin 11 is fitted into the elongated hole 14a to position the arm 9.

Reference numeral 18 denotes a swivel positioning guide for 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 together.

[0017] a present onset Ming above configuration, when tightening the screw by rotating the cap nut 13 is pressed against the lower plate 3 by immersion nozzle 6 spring 10a is compressed through the joint mortar 8 . Further, when the screw is loosened, the spring force of the spring 10a is released, the swivel base 14 is also rotatable, and the immersion nozzle 6 can be attached and detached.

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, so that the immersion nozzle 6 can be operated by a few rotations of the cap nut 13. Sufficient stroke can be obtained for replacement. Moreover, in the middle of the lifting stroke of the arm 9, 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, so that the lifting operation can be performed with a light load.

Further, since the swivel part in the shape of a disc, it can be lowered overall height of the device, saving the space between the continuous casting machine tundish and the mold. If the base 17 is omitted, the total height can be further reduced. Furthermore, spring 1
Since 0a is located away from the high temperature part such as the immersion nozzle 6, it is hardly affected by heat and can be used stably for a long period of time.

[0020]

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 the drawings]

1 is a diagram showing a sectional part of a whole.

The Figure 2 details a diagram showing in cross-section.

FIG. 3 is a view 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 (72) Inventor Tadao Saigo 4-7 28 Kitahama Chuo-ku, Osaka City, Osaka Prefecture Sumitomo Heavy Industries Casting & Forging Co., Ltd. (72) Fuyuji Nishiyama 4-7 Kitahama, Chuo-ku, Osaka City, Osaka Prefecture No. 28 Sumitomo Heavy Industries Casting & Forging Co., Ltd. (56) References JP 62-13256 (JP, A) Actual development 55-71650 (JP, U)

Claims (1)

(57) [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. as movement capable <br/> to, together to hold the support hardware of the lower plate constituting the sliding gate, between the support fittings and arms of the lower plate, interposed the turning mechanism, further, the pivot
Immersion nozzle holding apparatus characterized by the vertical position adjustment member of the arm swinging in multiple directions is provided suspended to allow <br/> the mechanism.