Dispensing – Molten metal dispensing – With subjacent flow guide
Patent
1996-01-03
1997-11-18
Kastler, Scott
Dispensing
Molten metal dispensing
With subjacent flow guide
266DIG1, 222591, B22D 4156
Patent
active
056884257
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a submerged nozzle changing apparatus for changing a submerged nozzle through which a molten metal is taken out from a molten metal container.
BACKGROUND ART
As shown, by way of example, in FIG. 11, a molten metal container 1, such as a tundish or a ladle, has a bottom wall 2 provided with a well block 3 having a tap hole 4, and an insert nozzle 5 is inserted in the tap hole 4. A slide valve device 6 having a bottom plate 7 provided with a hole 8 is attached to the lower surface of the tundish 1 so as to support the insert nozzle 5 on the upper surface of the periphery of the hole 8 of the bottom plate 7. Further, a submerged nozzle 9 is held at its upper part in a suspended position under the slide valve device 6 by a nozzle case 10, and the nozzle case 10 is held by a submerged nozzle holding device 11.
In a continuous casting installation as shown in FIG. 12, the lower part of the submerged nozzle 9 is submerged in a water-cooled mold 12, a molten metal is poured into the mold 12 continuously through outlet openings 9a formed in the circumference of the lower part of the submerged nozzle 9. The circumferential part of the molten metal 13 is cooled in the mold 12, and then the molten metal 13 is discharged from the lower end of the mold 12 and delivered to the next process.
The slide valve device 6 has a slide plate 16 provided with a hole 17 and connected to the piston rod 15 of a hydraulic cylinder actuator 14. The hydraulic cylinder actuator 14 slides the slide plate 16 horizontally between a position where the hole 17 of the slide plate 16 coincides with the hole 8 of the bottom plate 7 and a position where the hole 17 of the slide plate 16 is positioned away from the hole 8 of the bottom plate 7, to regulate the discharge rate of the molten metal.
The nozzle case 10 houses therein a top expanded part of the submerged nozzle 9 and the upper end surface of the submerged nozzle 9 is closely joined through a seal packing, not shown, to the lower end surface of a chute nozzle 18. Mounting pins 19 project diametrically opposite to each other from the outer surface of the nozzle case 10.
Since the lower part of the submerged nozzle 9 is submerged continuously as mentioned above in and washed by the molten metal, the lower part of the submerged nozzle 9 wears out and the submerged nozzle must be replaced with a new submerged nozzle 9 at an appropriate time.
Accordingly, nozzle holding device 11 capable of changing the submerged nozzle 9 as quickly as possible have been used. In the conventional nozzle holding device 11 shown in FIG. 11, a pneumatic cylinder actuator 21 is attached to the lower surface of the slide valve device 6 with its piston rod 20 projecting downward, and a support arm 22 is fixed to the piston rod 20 of the pneumatic cylinder actuator 21. The support arm 22 is provided in its free end with recesses 23 for receiving the mounting pins 19 of the nozzle case 10 therein to support the nozzle case 10. After the mounting pins 19 of the submerged nozzle 9 have been seated in the recesses 23, the piston rod 20 of the pneumatic cylinder actuator 21 is retracted to press the upper end surface of the submerged nozzle 9 through a sealing packing against the lower surface of the periphery of the hole 17 of the slide plate 16 or, when the slide valve device 6 is provided with the chute nozzle 18, against the lower surface of the chute nozzle 18 and to hold the submerged nozzle 9 fixedly in place. The means for fixedly holding the submerged nozzle 9 may be a lever or toggle mechanism.
When replacing the submerged nozzle 9 with a new one using this nozzle holding device, the slide plate 16 of the slide valve device 6 is first driven for sliding to close the slide valve device 6, the piston rod 20 of the pneumatic cylinder actuator 21 is then extended to lower the support arm 22 after lifting up the tundish 1, and the submerged nozzle 9 is dismounted by hand. Thereafter, the lower end surface of the chute nozzle 18 is cleaned; a new submerged nozzle 9
REFERENCES:
patent: 4220271 (1980-09-01), Szadkowski
patent: 4854488 (1989-08-01), Trenkle et al.
patent: 5180536 (1993-01-01), Bruckner et al.
patent: 5238158 (1993-08-01), Yamamoto et al.
Taniguchi Tadao
Yamamoto Kenji
Kastler Scott
Shinagawa Shirorenga Kabushiki Kaisha
LandOfFree
Submerged nozzle changing apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Submerged nozzle changing apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Submerged nozzle changing apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1563238