JPH0627253Y2 - Pouring nozzle holding device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is provided with a mechanism for vertically moving and crimping a pouring nozzle of a molten metal pouring part provided at the bottom of a molten metal container such as a ladle and a tundish. It relates to a pouring nozzle holding device.

[Prior Art] Between the molten metal container and the mold in continuous casting,
In order to prevent the oxidation of molten metal such as molten steel and improve the quality of products, pouring nozzles such as dipping nozzles and long nozzles are arranged. Since this pouring nozzle is used in contact with the molten metal, it is damaged or deteriorated by erosion by the molten metal or precipitation of inclusions. Therefore, it is necessary to frequently replace the pouring nozzle.

Replacement of the pouring nozzle is required to be performed promptly in order to improve the operating efficiency of the continuous casting line. for that reason,
Various nozzle exchanging devices have been conventionally developed. For example, Japanese Utility Model Publication No. 58-41008, Japanese Utility Model Publication No. 60-25327, and the like introduce an exchange device using a bayonet structure.

[Problems to be solved by the device]

However, in the bayonet type exchange devices disclosed in these publications, since the crimping and holding structure of the nozzle connecting portion is insufficient, it is necessary to perform additional tightening many times during operation. Further, the operator is required to constantly monitor the crimped state of the nozzle connection portion, otherwise it may cause an accident due to leakage of molten steel or a deterioration of steel quality due to drawing of air.

In addition, the inner wall of the cylinder that fits the shaft for raising and lowering the hanger and the outer periphery of the shaft are in parallel contact when the upper and lower contacts at the nozzle crimping part. It is required to finish. Furthermore, the shaft has
The weight of the nozzle suspended on the hanger is added, and an excessive load is applied as a supporting point. Therefore, it is necessary to attach it particularly firmly, and the shaft body itself is worn out more. As a result, it has also been a cause of reducing the pressing force of the nozzle.

Therefore, the present invention constantly presses the pouring nozzle against the sliding nozzle device with a constant force, and balances the weight of the pouring nozzle to support the pouring nozzle so that the pouring nozzle does not loosen under stable conditions. It is intended to be attached to the device.

[Means for Solving the Problems]

The pouring nozzle holding device of the present invention comprises a shaft column (3) standing on a base (2) attached to a mounting plate (1) provided on the outer shell (A) of a container for containing molten metal. A nozzle holding device (C) configured in the center, which is provided on one side with a support body (31) that comes into contact with a support guide (30) on the container side, and a hanger (2) for a pouring nozzle.
8) has a hanger base (8) on the other side, and the hanger base (8) is swingably supported by an outer case (4) rotatably attached to the shaft column (3). , The outer case (4)
Inside, a middle case (11) divided into upper and lower stages is provided with a vertically long stop hole (15) in which a bolt (17) inserted from the outside of the outer casing (4) is opened in the middle casing (11). It is movable in the up-and-down direction by being inserted into and is attached so as to be prevented from rotating, and an elastic body inserted in the outer case (4) is attached to the upper step surface of the middle case (11). 14) is placed, and further, a spiral groove (19) is provided on the inner peripheral wall of the lower step portion of the middle case (11), and an end plate (19) is provided on the lower step side of the middle casing (11). An inner case (21) having a shaft (3) attached thereto by means of (25) and provided with an ascending / descending projection (20) on the outer peripheral wall which is movable in the screw groove (19) of the middle casing (11). Is rotatably inserted.

[Action]

That is, in the present invention, in order to raise and lower the outer case for supporting the hanger provided on the shaft column, the inner case for raising and lowering and the inner case are fitted in a bayonet manner, and the outer case for supporting the hanger is further attached to the middle case. It is fitted. An elastic body is internally provided between the outer case and the middle case to support the hanger base in a swingable manner. Further, a support body that receives a load from the immersion nozzle side is provided on the side opposite to the hanger portion around the shaft column as an auxiliary of the shaft column.

Then, when the pouring nozzle is attached to the sliding nozzle device, the base of the hanger is always kept pushed up by the elastic body through the outer case. Therefore, the main body of the hanger is also kept pushed up, and the looseness of the nozzle crimping portion is prevented. Further, the support provided as an auxiliary of the shaft column reduces the bending load applied to the shaft column, and the effect of maintaining the nozzle crimping by the elastic body is enhanced.

〔Example〕

Hereinafter, the features of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing a state in which a casting nozzle connected to a sliding nozzle device attached to a molten metal container is held by a nozzle holding device of this embodiment. Also,
FIG. 2 is a bottom view of the same, and FIG. 3 is an exploded view of a holding device elevating part.

A sliding nozzle device B is provided on the outer shell A of the container for containing the molten metal via a mounting plate 1. The nozzle holding device C of this embodiment has the same mounting plate 1
Is attached to the base 2, and is configured around a shaft column 3 standing on the base 2. An outer case 4 for supporting a hanger is attached to the shaft post 3, and a holding projection 5 of the hanger support member 6 is provided in a receiving hole 5 (see FIG. 3) formed in the outer circumference of the outer case 4. 8 through holes 9. As a result, the hanger base 8 is swingably held.

The outer case 4 has a shaft tube 10 at the center. This shaft tube 10
Is in a state where the shaft column 3 is inserted and penetrates the partition wall 12 of the middle case 11 which is partitioned into upper and lower two stages. The inner wall of the shaft tube 10 does not require precision with respect to the shaft column 3 and may be finished so that it can be freely moved up and down with play. An elastic body 14 is arranged in a space formed by the upper case 13 of the outer case 4 and the middle case 11. As the elastic body 14 in this embodiment, an integrated double coil spring is used.
Multiple springs arranged around 10 can also be used.

A vertically long stop hole 15 is provided on the outer peripheral wall of the upper step portion 13 in order to obtain a pressure-bonding holding effect by the elastic body 14. A stopper bolt 17 is inserted into the stopper hole 15 from an opening 16 of the outer case 4. As a result, the rotation of the middle case 11 is blocked.

A thread groove 19 is provided on the inner peripheral wall of the lower step portion 18 of the middle case 11. Then, the inner case 21 in which the ascending / descending projection 20 fitted in the thread groove 19 is attached to the outer peripheral wall is the lower step portion 18 of the middle case 11.
Be attached to. The inner case 21 has a bayonet structure including a protrusion 23 to be inserted into the turning handle 22. An end plate 25 having a position fixing portion 24 is attached to the tip of the shaft column 3 to prevent the outer case 4, the middle case 11 and the inner case 21 from falling off. Further, the end plate ring 26 is provided on the end plate 25, and the rotation of the inner case 21 with respect to the end plate 25 is made smooth.

A hanger support arm 27 extends to one side from a hanger base 8 which is swingably held with respect to the outer case 4 with the shaft 3 as an axis. A pouring nozzle 29 such as a dipping nozzle or a long nozzle is suspended by a hanger 28 attached to the tip of the hanger support arm 27. Also, the hanger base 8
On the other hand, the support 31 that receives a bending load on the shaft column 3 on the hanger 28 side when it comes into contact with the support guide 30 on the container outer shell A side is aligned with the axis of the pouring nozzle 29. It is provided. As a result, it is possible to prevent an unreasonable force from being applied to the shaft 3.

A stop guide 32 and a lifting guide 33 are provided as an auxiliary mechanism for crimping the pouring nozzle 29 to the sliding nozzle device B. With these guides 32, 33,
The hanger base 8 is guided to rotate and move up and down, and is positioned at a predetermined position.

Next, the operation procedure of this nozzle holding device will be described with reference to FIGS. 4 to 6.

First, the nozzle holding device C is swung to abut the stop guide 32, and is placed below the sliding nozzle device B as shown in FIG. 4 (a). In this state, the middle case 11
It has descended to the position of the end plate 25 and stopped. A predetermined gap z is provided between the pouring nozzle 29 and the sliding nozzle device B and between the support guide 30 and the support 31.
And the nozzle holding device C waits. At this time,
The elastic body 14 is in an extended state, and the stopper bolt 17 hits the upper end of the stopper hole 15 to stop the elastic body 14.
A gap y is formed between the inner surface of the upper end of the upper case and the outer surface of the upper end of the middle case 11.

In this state, as shown in FIG. 5 (a), the turning handle 22 is in a state of being stopped at a position which is turned to the far left back. In addition, the lifting projection inserted in the thread groove 19
20 is at the upper end of the thread groove 19 as shown in FIG. 6 (a).

Next, the turning handle 22 is turned in the direction of the arrow in FIG. 5 (b) to turn the inner case 21. At this time, the inner case
As shown in FIG. 6 (b), the lifting protrusion 20 of 21 is provided with a thread groove 19
Move along. Therefore, the middle case 11 is shown in FIG.
As shown in (b), the outer case 4 is pushed up and raised.
By this rise of the outer case 4, the support guide 30 is moved to the support 31.
And the pouring nozzle 29 is sliding nozzle device B.
Stick to. In this state, since the pressure of the elastic body 14 is not acting, the gap y does not change.

Further, the turning handle 22 is turned to turn the inner case 21 to the fully rotated position shown in FIG. 5 (c). At this time, since the outer surface of the upper end of the outer case 4 is in contact with the lower surface of the base 2, the middle case 11 rises but the outer case 4 does not rise. Therefore, the elastic body 14 interposed between the outer case 4 and the middle case 11 is distorted, and the pouring nozzle 29 is pressed against the sliding nozzle device B by the reaction force of the elastic body 14. Here, the stopper bolt 17 is provided with the elastic body 14 in the stopper hole 15.
The bending allowance is provided by the amount excluding the bending amount x. Therefore, the outer case 4 is maintained in a state of being pushed up by the reaction force corresponding to the bending amount x of the elastic body 14.

When the pouring nozzle 29 is removed from the sliding nozzle device B, the turning handle 22 is turned to turn the middle case 11 from FIG. 5 (c) to (a). This widens the gap z between the outer case 4 and the middle case 11,
A similar gap z is formed between the sliding nozzle device B and the pouring nozzle 29. In this state, the hanger support arm 27 is swung to move the pouring nozzle 29 into the sliding nozzle device B.
And the pouring nozzle 29 from the nozzle holder 34.

[Effect of device]

As described above, in the present invention, since the pouring nozzle is pressed against the sliding nozzle device with the elastic body such as the coil spring, the pressing force of the pouring nozzle with respect to the sliding nozzle device is maintained at a constant set value. You can Therefore, compared to the conventional bayonet structure,
The setting work is not complicated, and there is no need to increase the pressing force repeatedly during the molten steel pouring work.

Further, since the base side of the hanger is supported by the shaft pillar and the support, the fitting portion of the shaft pillar and the shaft tube can be finished roughly, and the load on the shaft pillar can also be reduced by sharing with the support. . Furthermore, when the bending allowance is provided on the lifting projection, the reduction in the repulsive force of the elastic body does not affect the reduction in the pressing force as it is, and it is possible to use the pressing force with a stable pressing force for a long period of time.

[Brief description of drawings]

FIG. 1 is a sectional view of the nozzle holding device of the present invention taken along the line II of FIG. 2, FIG. 2 is a bottom view, FIG. 3 is an exploded view, and FIGS.
The figure is a view for explaining the pressure-bonding holding operation of the pouring nozzle by the nozzle holding device. 3: Shaft column, 4: Outer case, 8: Hanger base 11: Middle case, 13: Upper step, 14: Elastic body 18: Lower step, 19: Thread groove, 20: Lifting protrusion 21: Inner case, 28 : Hanger, 29: Pouring nozzle 30: Support guide, 31: Support

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Shou 57-146937 (JP, U) Seki 59-34840 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A shaft column (3) which is erected on a base (2) mounted on a mounting plate (1) provided on an outer shell (A) of a container for containing molten metal. Nozzle holding device (C), a support (31) that abuts the support guide (30) on the container side is provided on one side, and a hanger base (pouring hanger (28) for the pouring nozzle is provided on the other side ( 8), the hanger base (8) is swingably supported by an outer case (4) rotatably attached to the shaft column (3), and the hanger base (8) is provided inside the outer case (4). The middle case (11) divided into upper and lower parts has a vertically long stop hole (1) formed by opening a bolt (17) inserted from the outside of the outer casing (4) in the middle casing (11).
5) is vertically movable by being inserted into the outer case (4) and is attached to the upper case surface of the inner case (11) while being elastically inserted in the outer case (4). The body (14) is placed, and further the middle case
A spiral groove (19) is provided on the inner peripheral wall of the lower step portion (11), and the end plate (2) is provided on the lower step side of the middle casing (11).
5) is attached to the shaft column (3) and is movable in the screw groove (19) of the middle casing (11).
A pouring nozzle holding device, wherein an inner case (21) provided with (0) on an outer peripheral wall is rotatably inserted.