JPS633703B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a sealing device between a mold and a pouring nozzle in a horizontal continuous casting machine equipped with a track-type mold.

This type of horizontal continuous casting machine has the problem of molten metal leaking between the pouring nozzle and the mold, but as a countermeasure to this problem, solidification tongues of the molten metal are formed on the outer periphery of the tip of the molten metal nozzle. However, a method has previously been proposed in which the tips of the solidifying tongues are sealed against the inner circumferential surface of the mold by static pressure of the molten metal to prevent leakage of the molten metal. However, with this proposed measure, it is necessary to set a small gap (approximately 0.2 mm) between the pouring nozzle and the mold in the early stage of pouring to prevent the molten metal from entering. Needless to say, all of the molds require a high degree of processing precision, and in order to prevent the pouring nozzle from clogging due to molten metal in the initial stage of pouring, the pouring nozzle is
After heating to 1000℃, the pouring nozzle is inserted into the mold in a few seconds, but because the heating causes thermal expansion and deformation, it is extremely difficult to insert the pouring nozzle into a small gap. This method has the drawbacks of complicating equipment such as measuring devices and adjusting devices, and requiring advanced operating techniques. In addition, since the pouring nozzle is required to have high processing accuracy, high hot strength, high mechanical strength, small coefficient of thermal expansion, etc., it has the disadvantage that it is expensive and difficult to increase in size.

The present invention has been proposed for the purpose of eliminating the drawbacks of the above-mentioned proposed measures, and includes the bases of a large number of solidifying tongue support rods arranged along the circumferential direction on the outer periphery of the tip of the pouring nozzle of a horizontal continuous casting machine. A flexible sealing material is filled between the mold and the pouring nozzle on the molten metal surface side of the sealing ring, and each solidifying tongue support rod is inserted through the sealing material. This invention relates to a sealing device between a mold and a pouring nozzle of a horizontal continuous machine, characterized in that the tip thereof is protruded toward the molten metal side.

Hereinafter, according to the embodiment shown in FIGS. 1 and 2,
The present invention will be specifically explained. In FIG. 1, M is a mold of a horizontal continuous casting machine, N is a pouring nozzle inserted into the mold M, 1 is a cut groove provided on the outer peripheral surface at the tip of the pouring nozzle N, 2 is a seal ring that is slidably fitted into the cut groove 1, and the seal ring 2 is divided into a plurality of pieces, and there is a space between the inner peripheral surface of the seal ring 2 and the cut groove 1. , a spring or a refractory material 3 having elasticity is disposed, and the outer circumferential surface of the seal ring 2 is pressed against the inner circumferential surface of the mold M with an appropriate pressing force. Reference numeral 4 denotes a flexible sealing material attached to the entire outer peripheral surface of the tip of the pouring nozzle N, and the sealing material 4 is formed of ceramic fiber, sheet, or the like. Reference numeral 5 denotes a large number of coagulation tongue support rods whose one end penetrates the sealing material 4 and is embedded in the seal ring 2, and the other end of each coagulation tongue support rod 5 is connected to the tip of the pouring nozzle N. The molten metal discharge side of the pouring nozzle N is protruded from the molten metal discharge side.

One embodiment of the sealing device of the present invention is configured as described above, and when the horizontal continuous casting machine starts operating and molten metal is supplied from the pouring nozzle N into the mold M, the molten metal is poured into the mold M. It is cooled by water and begins to solidify from the mold surface, and a slab is formed over time.
It is continuously pulled out to the rear of the mold. In this case, the molten metal nozzle, which is solidified by contacting a large number of solidifying tongue support rods 5 in the early stage of pouring from the pouring nozzle N, is attached to the pouring nozzle N side and grows due to the cooling action from the mold M. However, the growth is stopped by being washed by the high temperature molten metal poured from the pouring nozzle N, and the solidified tongue piece 6 is formed which becomes more flexible toward the tip by being maintained at a high temperature. The solidifying tongues 6 are pressed against the inner circumferential surface of the mold by the static pressure of the molten metal in the mold M, maintaining an effective sealing action and preventing the flexible sealing material 4 from peeling off from the solidifying tongues 6. This ensures the sealing effect of the flexible sealing material 4. Further, in this case, the seal ring 2 lightly contacts the inner surface of the mold M by the elastic member 3 to prevent the flexible seal material 4 from being pushed out by the pressure of the molten metal in the mold M, and Absorbs undesirable forces acting between the mold M and the molten metal nozzle N due to deformation, thermal expansion of the molten metal nozzle N, thermal deformation, misdirection of the device, etc.

Since the device of the present invention has the above-described configuration and operation, the present invention eliminates the drawbacks of the proposed device, does not require sophisticated operating skills like the proposed device, and , the pouring nozzle N is not required to have high processing accuracy, high hot strength, high mechanical strength, and small coefficient of thermal expansion, and prevents leakage of molten metal from the gap between the pouring nozzle N and the mold M.
This has the practical effect of making it possible to operate a horizontal continuous casting machine for a long time.

In another embodiment of the present invention shown in FIG. 3, the outer periphery of the tip of the pouring nozzle N is surrounded by a steel shell 7 that is integral or divided along the circumferential direction, and a hollow cooling portion 8 of the steel shell 7 is provided.
It has a structure in which a coagulating tongue piece 6 supporting rod 5 is embedded in a head 8 having a shape a, and a flexible sealing material 4 is disposed therein.

Another embodiment of the present invention shown in FIG. 4 has a structure in which a seal ring 2' is embedded or crimped on the outer periphery of the tip of the pouring nozzle N, either integrally or divided along the circumferential direction. .

Further, in another embodiment of the present invention shown in FIG. 5, a seal ring 2 divided into a plurality of pieces along the circumferential direction is fitted into a cut groove 1 on the outer periphery of the tip of the pouring nozzle N. .

In the embodiments shown in FIGS. 3 to 5, a flexible sealing material 4 prevents molten metal from leaking during pouring, and during normal operation, solidifying tongues 6 prevent molten metal from leaking and protect the sealing device. Basically, it has the same effect as the embodiment shown in FIGS. 1 and 2.
be effective.

[Brief explanation of the drawing]

1 and 2 are schematic explanatory diagrams of one embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along line A--A in FIG. 5 are schematic longitudinal sectional views of other embodiments of the present invention, respectively. M: Mold, N: Pouring nozzle, 1: Cut groove, 2,
2': Seal ring, 3: Elastic member, 4: Flexible sealing material, 5: Support rod for solidifying tongue piece 6.

Claims (1)

[Claims] 1. A seal ring to which the bases of a large number of solidifying tongue support rods are attached along the circumferential direction is arranged on the outer periphery of the tip of the pouring nozzle of a horizontal continuous casting machine, and the mold and the mold on the molten metal surface side of the seal ring are installed. A horizontal continuous machine characterized in that a flexible sealing material is filled between the pouring nozzles, and the tips of the solidifying tongue support rods are provided to protrude toward the molten metal side through the sealing material. A sealing device between the mold and pouring nozzle.