JPH1085913A - Device for exchanging immersion nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a marking on a joining surface of an immersion nozzle at the time of shifting new immersion nozzle to a prescribed position by sliding while having a quick changing function. SOLUTION: A slide valve device 3 for controlling flow-out of molten metal is provided at the flowing outlet part of lower part of a molten metal vessel 1, and a case for holding at the upper end of the immersion nozzle is engaged with the slide valve device to support a guide arm 24 having a prescribed length and supporting while hanging so as to be freely slid by energizing upward so as to be shakable in the vertical direction while using a shaft 21 at the one end side as the supporting point. A pushing cylinder 30 is arranged so as to push out the old immersion nozzle 5" to the reverse side by pushing the new immersion nozzle 5' set to the free end side of this guide arm 24. An inclining cam 27 for holding the guide arm 24 to a horizontal state while a nozzle hole 5"b of the old immersion nozzle 5" comes out from a nozzle hole 11a of the slide valve device 3 side and is closed, and for shaking the guide arm downward by abutting on a guide roller 35 responding to a piston rod 30a of the pushing cylinder 30, is arranged on the upper surface of the guide arm 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for replacing a dipping nozzle used to discharge molten metal from a molten metal container.

[0002]

2. Description of the Related Art In a molten metal container such as a tundish or a ladle, as shown in a sectional view of FIG.
The lower part of the insert nozzle 2 is supported on the upper surface around the hole 4a of the upper plate 4 of the slide valve device 3, and the lower portion of the slide valve device 3 An immersion nozzle 5 whose outer periphery is covered with a metal case 6 is an immersion nozzle support device 7
To be suspended and supported.

In the case of a continuous casting facility, the lower part of the immersion nozzle 5 is immersed in a water-cooled mold 8 as shown in FIG. The metal is continuously discharged into the mold 8, the peripheral surface is cooled in the mold 8, the molten metal 9 is solidified, discharged from the lower part, and guided to the next step.

The slide valve device 3 is shown in FIG.
The slide plate 10 connected to the piston rod of the hydraulic cylinder (not shown) and sliding in the horizontal direction (in the direction perpendicular to the plane of FIG. 6A) slides by the operation of the hydraulic cylinder (not shown). The outflow of the molten metal is controlled by matching or non-matching of the hole 10a of the slide plate 10 with the holes 4a, 11a of the upper and lower plates 4, 11.

The upper end of the immersion nozzle 5 has a slightly larger diameter and is covered by a metal case 6 including the upper end, and the joining surface at the upper end of the immersion nozzle 5 has a lower plate 11 (including the lower nozzle). Therefore, the lower nozzle 11
(Collectively referred to as).

The lower part of the immersion nozzle 5 is constantly immersed in the molten metal in the mold 8 as described above and is washed by the molten metal, so that the lower part wears out and is appropriately replaced with a new immersion nozzle (hereinafter referred to as a new immersion nozzle). Immersion nozzle 5 ').

Therefore, conventionally, as shown in FIGS. 6 and 7, both ends of one immersion nozzle are slidably supported on both sides of an immersion nozzle support device 7 provided below the slide valve device 3. A new immersion nozzle 5 ′ is set between one of the rails 12, and the immersion nozzle 5 ′ is hydraulically or air-driven supported on the lower surface of the molten metal container 1. The used immersion nozzle (hereinafter referred to as the old immersion nozzle 5 ″) is pushed by the piston rod 13a of the pressing cylinder 13 to transfer it to the rail 12 on the other side, from which the old immersion nozzle 5 ″ is transferred.
Some are made to take out. The immersion nozzle support device 7 has left and right support members 14, 14, and these support members 14, 14 are swingably supported on the lower surface of the slide valve device 3 by shafts 15, 15. The support member 1 is provided by springs 16, 16 interposed between the upper surface on the outer end side and the lower surface of the slide valve device 3.
The inner ends of the support members 4 and 14 are urged upward to support the support members 14 and 1.
The upper end joining surface of the immersion nozzle 5 suspended between the four nozzles 4 is pressed against and fixed to the lower surface of the lower nozzle 11.

According to this, the time required for replacing the immersion nozzle 5 can be shortened, and in the case of continuous casting, the time for stopping the outflow of the molten metal can be short, so that the scraping of the molten metal is reduced. There is an advantage that the yield can be improved.

[0009]

However, according to the above-mentioned prior art, when replacing the immersion nozzle 5, a new immersion nozzle 5 'is used.
Is slid to a predetermined position while sliding the upper end joining surface of the lower nozzle 11 while the surface pressure is being applied to the lower surface of the lower nozzle 11, so that the upper end joining surface of the new immersion nozzle 5 'is easily marked.
A gap is generated by this mark, and air is generated during use, which causes problems such as oxidization of the molten metal.

[0010] In particular, when the base metal 17 adheres to the inner periphery of the old immersion nozzle 5 ″ after use as shown in FIG.
When the new immersion nozzle 5 'is pressed by the piston rod 13a of the cylinder 13 to push out the old immersion nozzle 5 ", the base metal 17 is hardly cut, and even if it is cut, it is cut as shown in FIG. Metal 17 is the lower nozzle 1
When the new immersion nozzle 5 'is slid into this state, the upper end joining surface is further marked, and the adhesion at the time of joining is further lost.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a new immersion nozzle has a quick change function, does not have abrasion marks on the joining surfaces thereof, improves the adhesion between the joining surfaces, and prevents air from being generated. A slide valve device for controlling the outflow of molten metal is provided at a molten metal outlet at a lower portion of a molten metal container, and the slide valve device has a case for holding an upper end of an immersion nozzle. And a guide arm of a required length which is slidably suspended and supported so as to be vertically swingable with one end thereof as a fulcrum and urged upward to support the guide arm at the free end side of the guide arm. A push cylinder is provided for pushing the new immersion nozzle set on the arm to push the old immersion nozzle to the opposite side, and a guide responsive to the piston rod of the push cylinder is provided on the upper surface of the guide arm. The guide arm is kept in a horizontal position until the nozzle hole of the old immersion nozzle comes off the nozzle hole on the slide valve device side and closes, and then the new immersion nozzle is placed on the lower surface of the nozzle on the slide valve device side. To provide a tilt cam for swinging the guide arm downwards.

Preferably, the slide valve device is provided with a guide base for preventing the guide roller from floating when the guide roller is engaged with the tilt cam. The urging means of the guide arm is preferably formed by a compression spring interposed between an arm base extending from the pivot axis of the guide arm to the outer end side and the slide valve device by a simple structure. Other urging means such as a cylinder may be used.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings, and the same reference numerals will be used for members common to those in FIG.

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a bottom view, and FIG. 3 is an enlarged view of a main part of FIG.

In the above embodiment, the slide valve device 3
Shows a case where the lower nozzle 11 is provided, and the arm base 19 is positioned on one side of the lower nozzle 11 and supported by a bearing 21 on the slide valve device 3 side by a shaft 21 so as to be vertically swingable, The arm base 19 has a coil-shaped compression spring 22 as an elastic body between an end opposite to the lower nozzle 11 and the lower surface of the slide valve device 3.
Are interposed via a spring holder 23, and the arm base 19 is provided with a slidability in the counterclockwise direction in FIGS.

The arm base 19 has a submerged nozzle 5
The base 24a of the guide arm 24 for suspending and supporting is fixed by a bolt 25 or the like.

As shown in FIG. 4, the guide arm 24 has a projecting portion 50a at the periphery of a holding case 50 for holding the nozzle 5 by fitting a large-diameter portion above the immersion nozzle 5.
Have two guide rails 26, 26 facing each other for slidably supporting each other, and have a length that can be fitted to the holding case 50 for at least three immersion nozzles. The lower nozzle 11 is positioned so that its center in the longitudinal direction crosses from one side to the other side of the lower end position of the lower nozzle 11.

On the upper surface of the guide arm 24, there is formed an inclined cam 27 which is inclined upward from the distal end 24b side to the proximal end 24a side. Have been.

A pressing cylinder 30 is provided at a position facing the tip 24b of the guide arm 24. The pressing cylinder 30 is supported by a fixed base 31 on the lower surface of the molten metal container 1 via a support bracket 32, and the bracket 32 is rotatable by a pin 33 on the fixed base 31. When the new immersion nozzle 5 'is set on the 24b side, the pressing cylinder 30 can be rotated and retracted to the upper side side around the pin 33.

The piston rod 3 of the pressing cylinder 30
0a is provided with a holding case 50 for the new immersion nozzle 5 '.
, A first guide roller 35 in contact with the inclined cam 27 of the guide arm 24, and a second guide roller in contact with the lower surface of a guide base 36 fixed to the slide valve device 3 side. 37 and bracket 38
Is provided via These guide rollers 35 and 37
A guide rod 39 is provided in parallel with the pressing cylinder 30 behind the portion where the shaft is supported, and is inserted through the bearing 40 of the support bracket 32 to prevent the rotation of the piston rod 30a and to smoothly move forward and backward.

The positional relationship between the inclined cam 27 of the guide arm 24 and the guide rollers 35, 37
The new immersion nozzle 5 ′ set on the end 24 b side of the nozzle 4 is pushed by the press fitting 34 of the press cylinder 30 so that the nozzle hole 5 ″ b of the old immersion nozzle 5 ″ becomes the nozzle hole 11 of the lower nozzle 11.
a, when the lower nozzle 11 is closed, the second guide roller 37 contacts the lower surface of the guide base 36, and at the same time, the first guide roller 35 contacts the start end of the inclined cam 27 of the guide arm 24. Have been.

In FIG. 1, reference numeral 41 denotes a hydraulic cylinder for sliding the slide plate 10.

Next, the operation of the above embodiment will be described with reference to FIGS. When the immersion nozzle 5 is replaced, the pressing cylinder 30 is swung laterally about the pin 33 of the support bracket 32 in FIG. 3 and the new immersion nozzle 5 ′ is attached to the guide rails 26, 26 of the guide arm 24. 4a of the holding case 50 of FIG.
Shown) and set it at the position shown in FIG.

Next, the pressing cylinder 30 is lowered to a normal position, and the pressing cylinder 30 is operated to extend the piston rod 30a. Press. Thereby, the new immersion nozzle 5 ′ moves leftward in FIG. 3 along the guide rails 26, 26 of the guide arm 24.

When the old immersion nozzle 5 ″ reaches the position where the nozzle hole 5 ″ b is disengaged from the nozzle hole 11a of the lower nozzle 11 as shown in FIG. 5A, it moves forward together with the piston rod 30a. The first guide roller 35 is located at the start of the inclined cam 27 on the upper surface of the guide arm 24, and the second guide roller 37 is located on the lower surface of the guide base 36.

When the piston rod 30a further extends, the first guide roller 35 swings the guide arm 24 downward about the shaft 21 against the bias of the compression spring 22 via the inclined cam 27, and the new immersion is performed. A gap is formed between the upper end joining surface of the nozzle 5 'and the lower surface of the lower nozzle 11 (FIG. 5B). Under this state, the new immersion nozzle 5 'reaches the lower end position of the lower nozzle 11 (FIG. 5C).
The old immersion nozzle 5 ″ moves to the left end in FIG. 3 of the guide arm 24 and is removed from the end.

When the piston rod 30a is pulled back after that, the pressing force of the guide rollers 35 and 37 is released, and the guide arm 24 swings upward around the shaft 21 by the urging of the compression spring 22, and the new immersion is performed. Nozzle 5 '
The upper end joining surface of the lower nozzle 11 comes into close contact with the lower end surface of the lower nozzle 11 to complete the mounting.

The immersion nozzle 5 shown in the illustrated embodiment
Has shown the case without the metal case 6, but it is a matter of course that the immersion nozzle whose outer periphery is covered with the metal case 6 as shown in FIG.

[0029]

As described above, according to the present invention, when the new immersion nozzle is slid to the lower end surface position of the lower nozzle, the old immersion nozzle slides while being in contact with the lower end surface of the lower nozzle. Even if the base metal is adhered, the cutting is surely performed, and there is no factor that hinders the adhesion between the upper end joining surface of the new immersion nozzle and the lower end surface of the lower nozzle. Also, when the new immersion nozzle reaches the lower end surface position of the lower nozzle, it moves in a non-contact state with the lower end surface of the lower nozzle by the action of the inclined cam, so that there is no mark on the upper joining surface of the new immersion nozzle, Various excellent effects can be achieved such that the sealing property can be remarkably improved and the time required for replacing the immersion nozzle can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a bottom view of the same.

FIG. 3 is an enlarged sectional view of a main part of the same.

FIG. 4 is a view taken in the direction of the arrow A in FIG. 3;

FIGS. 5A to 5C are explanatory diagrams showing a process of replacing a dipping nozzle.

6 (A) is a sectional view, and FIG. 6 (B) is a view taken in the direction of arrow B of FIG.

FIG. 7 is a view taken in the direction of arrows CC in FIG. 6 (A).

FIG. 8 is an explanatory view showing a process of replacing the immersion nozzle in the prior art shown in FIGS. 6 and 7.

FIG. 9 is an explanatory view showing a situation where metal is adhered in a nozzle hole.

FIG. 10 is an explanatory view showing a state in which a bullion is cut in a conventional technique.

FIG. 11 is an explanatory diagram showing a relationship between a continuous casting facility and a submerged nozzle.

[Explanation of symbols]

 Reference Signs List 1 molten metal container 3 slide valve device 5 immersion nozzle 5 'new immersion nozzle 5 "old immersion nozzle 6 metal case 7 immersion nozzle support device 8 mold 11 lower plate (lower nozzle) 14 support member 19 arm base 21 shaft 22 compression spring 24 Guide arm 26 Guide rail 27 Inclined cam 30 Press cylinder 31 Fixed base 32 Support bracket 34 Press fitting 35 First guide roller 36 Guide base 37 Second guide roller 39 Guide rod 50 Holding case

Claims (3)

[Claims] A slide valve device for controlling the flow of molten metal is provided at a molten metal outlet at a lower portion of a molten metal container, and a holding case at an upper end of an immersion nozzle is engaged with the slide valve device. A guide arm of a required length that is slidably suspended and supported is vertically swingable with one end thereof serving as a fulcrum, and is urged upward to support the guide arm. The guide arm is set on the free end side of the guide arm. A pressing cylinder for pushing the new immersion nozzle to push the old immersion nozzle to the opposite side is provided, and a guide roller responsive to a piston rod of the pressing cylinder abuts on the upper surface of the guide arm, so that the old immersion nozzle is The guide arm is kept in a horizontal position until the nozzle hole is disengaged from the nozzle hole on the slide valve device side and is closed. Immersion nozzle exchanging device, characterized in that a tilt cam for causing between the guide swings the arm downward up to the nozzle bottom surface. 2. The immersion nozzle exchanging device according to claim 1, wherein the slide valve device is provided with a guide base for preventing the guide roller from floating when the guide roller is engaged with the inclined cam. 3. The guide arm biasing means comprises an elastic body interposed between an arm base extending outward from a pivot axis of the guide arm and a slide valve device.
Or the immersion nozzle replacement device according to 2.