Dispensing – Molten metal dispensing – With subjacent flow guide
Patent
1997-10-03
1999-08-24
Kastler, Scott
Dispensing
Molten metal dispensing
With subjacent flow guide
266DIG1, B22D 4156
Patent
active
059421479
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a replacing device for a submerged nozzle which is used to flow molten metal out of a molten metal container.
BACKGROUND ART
An example of a molten metal container such as tundish or ladle is shown in FIG. 14. A tap hole 4 is formed in a nozzle seating block 3 at the bottom 2 of a tundish 1 as a molten metal container. An insert nozzle 5 is inserted through the tap hole 4 into the tundish 1. A lower part of the insert nozzle 5 is supported on the top surface of the periphery of a hole 8 of a bottom plate 7 of a slide valve device (hereinafter referred to as the SV device) 6 mounted on the underside of the tundish 1. At a lower part of the SV device 6, an upper part of a submerged nozzle 9 is held in a suspended manner by a submerged nozzle support device 11 via a nozzle case 10.
In continuous casting equipment, as shown in FIG. 15, a lower part of the submerged nozzle 9 is immersed in molten metal 13 contained in a mold 12 of a water-cooled structure. Through outlets 9a formed at the periphery of the lower part of the submerged nozzle 9, molten metal 13 is continuously poured into the mold 12. Molten metal 13 cooled at the peripheral surface in the mold 12 gradually solidifies. During this period, the molten metal 13 is discharged from the bottom to be guided to a next step.
The SV device 6 operates in the following manner: A slide plate 16 is connected to a piston rod 15 of a hydraulic cylinder 14 so as to slide in a horizontal direction. When the hydraulic cylinder 14 is actuated, the slide plate 16 slides to bring a hole 17 of the slide plate 16 into or out of alignment with the hole 8 of the bottom plate 7. As a result, the amount of molten metal outflow is controlled.
The submerged nozzle 9 has a somewhat increased-diameter upper end, which is fitted into the nozzle case 10. The upper end face of the submerged nozzle 9 is pressed against the lower end face of a chute nozzle 18 via a seal packing (not shown). On the outer surface of the nozzle case 10, support pins 19, 19 protrude at diametrically symmetrical positions.
As described above, the lower portion of the submerged nozzle 9 is always immersed in a molten metal and washed thereby. Since it is thus damaged and worn, it should be replaced, where necessary, by a fresh submerged nozzle 9.
Under these circumstances, the submerged nozzle support device 11 has been used which can rapidly replace the submerged nozzle 9. In the conventional example of FIG. 14, an air cylinder 21 with a downwardly facing piston rod 20 is provided on the underside of the SV device 6. To the piston rod 20 of the air cylinder 21, a support arm 22 is secured. On the distal end of the support arm 22, recesses 23 are provided so that the submerged nozzle 9 is held in a suspended state by the support pins 19, 19 of the nozzle case 10. Into the recesses 23, the support pins 19, 19 of the nozzle case 10 are fitted, and then the air cylinder 21 is contracted. Thereby, the upper end face of the submerged nozzle 9 is pressed against the lower face of the periphery of the hole 17 of the slide plate 16 of the SV device 6, or if the SV device 6 is provided with the chute nozzle 18, it is pressed against the lower surface of the chute nozzle 18 via the seal packing. By this measure, the submerged nozzle 9 is fixed. The fixing means may employ a lever system or a toggle mechanism.
In replacing the submerged nozzle 9, however, the above-described device requires the following procedure: The slide plate 16 of the SV device 6 is caused to slide until its hole 17 is closed. The tundish 1 is raised, and then the air cylinder 21 is extended to lower the support arm 22. The submerged nozzle 9 is then removed manually, and the underside of the chute nozzle 18 is cleaned. Then, a fresh submerged nozzle 9 and a seal packing are set. Thereafter, the air cylinder 21 is contracted to lift the submerged nozzle 9, and the tundish 1 is lowered simultaneously. The slide plate 16 of the SV device 6 is caused to slide until its hole 17 is opened.
This replaceme
REFERENCES:
patent: 4091861 (1978-05-01), Thalmann et al.
patent: 5114123 (1992-05-01), Pfyl
patent: 5351865 (1994-10-01), Szadowski et al.
patent: 5688425 (1997-11-01), Yamamoto et al.
Taniguchi Tadao
Yamamoto Kenji
Yoshino Ryoichi
Kastler Scott
Shinagawa Refractories Co. Ltd.
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