JPH06104271B2 - Control device for stopper for casting nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a continuous or semi-continuous casting in which a molten metal is supplied to a mold whose upper end is an open type, which is used when continuously casting a slab of a copper-based alloy or the like. The present invention relates to a stopper control device for a dipping nozzle, and more particularly to a control device for a dipping nozzle stopper suitable for a continuous or semi-continuous casting method for supplying molten metal to a mold having a large number of strands.

[Conventional technology]

Continuous or semi-continuous casting method, the molten metal in the tundish, or the molten metal discharged from the melting furnace to the gutter is poured into a water-cooled copper mold, cooled by the mold to solidify the molten metal sequentially, and continuously cast from the mold. Is a method of pulling out.

In order to stably cast a slab with few casting defects in the continuous or semi-continuous casting method, in order to prevent the entrainment of mold flux into the slab, keep the molten metal supply amount into the mold constant. is important.

In general, as a mold for continuous or semi-continuous casting, a short penetrating mold composed of a pair of opposed mold short pieces and a pair of mold long pieces is used.

When the molten metal is supplied from the tundish or the gutter into the mold, an immersion nozzle is attached to the lower part of the tundish or the gutter, and the molten metal is ejected from the lower part of the nozzle and injected into the mold.

Conventionally, there are several types of jet nozzles of this immersion nozzle, and a nozzle suitable for the quality of the molten metal to be cast and the shape of the mold is used. For example, when casting a slab cast of a copper-based alloy by a continuous or semi-continuous casting method, the casting surface of the cast,
In particular, the use of the inverted T-shaped two-hole nozzle shown in FIG. 3 has become common because of the occurrence of pinholes inside the slab.

As shown in FIGS. 2 and 3, this nozzle generally has a cylindrical jet port 2 along the center line of the vertical cross section of the nozzle 1 in the casting direction. The jet port 2 is a molten metal. Are attached to the tundish or gutter 4 so as to squirt in parallel to the long side of the mold 3.

A nozzle stopper 5 is provided for the above nozzle 1, and the conventional nozzle stopper 5 is operated up and down by an air cylinder or a hydraulic cylinder 6 attached to a tundish or a gutter 4 as shown in FIG. It has become so.

Further, as this type of apparatus, there are JP-A-46-4358 and JP-A-
Those described in JP-A-46-5501, JP-A-49-92631, JP-A-50-142432 and the like are known.

[Problems to be Solved by the Invention]

However, in any of the conventional nozzle stopper control devices described above, the nozzle stopper is directly moved up and down by the air cylinder or the hydraulic cylinder to open and close the nozzle to control the molten metal supply amount. When the center of the nozzle and nozzle stopper are offset due to the weight and high heat of the nozzle, the uniform supply of molten metal to the mold cannot be controlled, and the nozzle and nozzle stopper are completely closed at the end of casting. There was a problem that it could not be put into a state.

Further, the nozzle stopper needs to be quickly fully opened or fully closed at the start of casting and at the end of casting, but the conventional control device has a drawback that some time lag occurs.

Further, in the conventional control device, when the number of strands (the number of ingots cast at the same time) increases, it is difficult to finely adjust each nozzle stopper independently.

The present invention has been made in view of the above circumstances, and provides a stopper control device for a continuous or semi-continuous casting nozzle, which has a simple structure and can easily control a large number of nozzle stoppers simultaneously or independently. The purpose is to do.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention is a control device for a nozzle stopper used in a continuous or semi-continuous casting nozzle, comprising a plug body portion at the tip, an external male thread portion, and a rotary operation portion at the top. Each of the male screw parts of the plurality of nozzle stoppers is provided with a plurality of female screw parts provided on the horizontal rod of the vertically rotatable support body composed of a horizontal rod and supporting rods provided at both ends thereof. Each of them is screwed, and the support is characterized by being rotatable in the vertical direction by a driving means such as a hydraulic cylinder attached to a supporting rod having its rotation center.

[Action]

Next, the operation of the present invention will be described. A support body holding a large number of nozzle stoppers is rotated by a driving means such as a hydraulic cylinder, and a large number of tundishes or troughs provided on the gutter bottom are connected to the nozzles. The opening is opened by the plug part at the tip of the nozzle stopper so that the molten metal in the gutter can flow into the dipping nozzle from the tundish or gutter after the start of casting, and at the end of casting, the opening is opened by the plug part. Block and stop flowing.

When a large number of ingots solidified in continuous or semi-continuous casting as described above are continuously drawn downward in the vertical direction, the amount of molten metal in a large number of molds may differ slightly from each other. In this case, the nozzle stopper is slightly rotated by a rotating operation portion (for example, a handle) above the nozzle stopper to finely adjust the flow rate of the molten metal when the nozzle is opened. The rotation operation unit can be automatically operated by a device other than the handle.

Even if the tundish or gutter is deformed by the weight and heat of the melt and the distance between the stopper stopper nozzle part and the nozzle opening at the gutter bottom or the center is slightly displaced, the molten metal can be applied to many molds by operating the handle. Can be supplied uniformly.

Further, when the molten metal still flows into the submerged nozzle even if the support is rotated at the end of casting to close the nozzle opening with the plug portion at the tip of the nozzle stopper, the molten metal can be completely flowed by the operation of the rotating operation unit. You can stop at.

〔Example〕

Next, an embodiment of a control device for a stopper for a continuous casting nozzle according to the present invention will be described with reference to the drawings.

1 and 2 show an embodiment of the present invention, in which a two-hole immersion nozzle 1 has a cylindrical jet port 2 along the center line of a vertical cross section in the casting direction. The submerged nozzle 1 is attached to the bottom of the gutter 4, and a flow passage 1a leading to the jet port 2 of the submerged nozzle 1 is connected to a hole 4a formed in the bottom of the gutter 4. Also this hole 4a
, The bottom of the gutter 4 is formed into a funnel-shaped valve seat 4b.

On the other hand, the nozzle stopper 7 that opens or closes the valve seat 4b has a plug portion 8 made of a carbon material at its tip, an intermediate portion having a male screw portion 9, and a plurality of rods at its upper portion.
The handle portion 10 is provided with a protruding portion 10a. The male screw portion 9 is screwed to a female screw portion 12 provided on the horizontal rod 11a of the support 11 holding the nozzle stopper 7. Further, the horizontal rod 11a of the support body 11 is provided with support rods 11b at both ends.
Equipped with a hydraulic cylinder centered on its rotation center P
It is designed to be rotated by 13.

Reference numeral 14 is a table that supports the molten metal 15 in the mold 3 at the start of casting, and the table 14 moves up and down by a hydraulic cylinder (not shown).

The present embodiment is not limited to the number of strands shown in FIG. 4 being three, but can be applied to the case of a large number of strands of two or more.

Next, the operation of this embodiment will be described. The raw material copper-based alloy is melted in a low frequency groove type induction heating melting furnace, and the molten metal is discharged to the gutter 4.

When tapping the water, first, the hydraulic cylinder 13 is operated to fully close the gap between the nozzle stopper 7 and the upper funnel-shaped valve seat 4b of the hole 4a communicating with the immersion nozzle 1, and the tap water is tapped into the gutter 4 and placed in the gutter. When the molten metal is fully opened with the molten metal accumulated to some extent, the molten metal flows into the nozzle 1 through the gap between the plug portions 8 at the tips of the multiple nozzle stoppers 7 and the corresponding valve seats 4b, as shown in FIG. As shown in FIG.
It goes inside and is stored in the mold 3 supported by the table 14.

The molten metal supplied into the mold 3 is deheated and starts solidifying in sequence, but after the molten metal stored in the mold 3 reaches a certain amount, the table 14 is lowered vertically downward by a hydraulic cylinder (not shown). Then, the slab 15 is cast while forming the solidified shell 16 as shown in FIG. 5 or FIG.

With the molten metal accumulated in the gutter to some extent, the nozzle stopper 7
The reason why the gap between the upper funnel-shaped valve seat 4b and the hole 4a communicating with the immersion nozzle 1 is fully opened is to prevent the flow passage 1a of the nozzle 1 from being blocked by the solidification of the molten metal. When it is confirmed that the molten metal is ejected from the ejection port 2 of the nozzle 1 without being biased, the hydraulic cylinder 13 is operated again, and the plug portion 8 at the tip of the nozzle stopper 7 and the valve seat 4b for each of them are operated. The amount of the molten metal flowing into the nozzle 1 through the gap does not compensate for the slab continuously drawn from the mold 3, and the molten metal surface position in the mold 3 is constant. The nozzle stopper 7 is lowered to a position where a proper gap is formed.

At this time, the bottom of the gutter 4 may be deformed as shown in FIG. 6 from the normal state shown in FIG. 5 due to the weight and heat of the molten metal. Attach the rods 10a of the upper handle 10 of the stopper 7 to the hook 17
To rotate the nozzle stoppers 7 independently to adjust the gap between the plug body 8 at the tip and the valve seat 4,
Each can ensure a predetermined opening.

Even when the plug body 8 of the nozzle stopper 7 and the valve seat 4b of the gutter 4 are slightly deviated from each other due to the deformation of the gutter 4, a large number of nozzles 1 can be operated independently by operating the handle 10.
It is possible to uniformly supply the molten metal.

In this way, when the cast piece 15 has a predetermined length and the casting is completed, the hydraulic cylinder 13 can be operated to make all the nozzles fully closed by the nozzle stopper 7, but due to the deformation of the gutter 4 described above. The plug part of the nozzle stopper 7 and the gutter 4
When a gap is generated between the valve seat 4b and the center of the valve seat 4b, and the molten metal still flows into the nozzle 1, the nozzle stopper 7 can be independently rotated to lower it to completely stop the flow.

Furthermore, when it becomes difficult to continue casting due to various troubles during casting, the nozzle stopper 7 is also lowered independently by rotating operation, and the molten metal is supplied while the other strands are continuously cast. You can stop.

〔The invention's effect〕

According to the present invention described above, when casting a large number of slabs at the same time, a large number of nozzle stoppers can be controlled simultaneously or independently of each other, so that uniform hot water can be easily supplied to each mold and the tundish can be easily supplied. Or even if the gutter is deformed downward due to the weight and high heat of the molten metal, each nozzle stopper can be finely adjusted independently, so that the supply of molten metal to each mold can be uniformly controlled, and the quality of each cast piece can be improved. Can be improved.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment according to the present invention, FIG. 2 is a front sectional view of a mold, FIG. 3 shows an immersion nozzle, (a) is a vertical sectional view, (b) is a side view, (c). ) Is a transverse sectional view, FIG. 4 is a front view, FIGS. 5 and 6 are front sectional views, and FIG. 7 is a sectional view of a conventional example. 1 ... Immersion nozzle, 3 ... Mold, 4 ... Gutter, 7 ... Nozzle stopper, 8 ... Stopper part, 9 ... Male screw part, 10 ... Handle part, 11 ... Supporting body, 12 ... Female thread, 13 ... Hydraulic cylinder.

Claims (2)

[Claims] 1. A nozzle stopper control device for use in a continuous or semi-continuous casting nozzle, comprising a plurality of nozzle stoppers each comprising a plug portion at the tip, a male screw portion in the middle, and an upper rotary operation portion. Each male screw part is respectively screwed to a plurality of female screw parts provided on the horizontal rod of a vertically rotatable support body composed of a horizontal rod and supporting rods provided at both ends thereof. A control device for a casting nozzle stopper. 2. A support body composed of a horizontal rod and supporting rods provided at both ends thereof can be vertically rotated by a driving means such as a hydraulic cylinder attached to the supporting rod having the rotation center. The control device for a stopper for a casting nozzle according to claim 1, wherein: