JPH03189068A - Controller of stopper for casting nozzle - Google Patents

Abstract

PURPOSE:To allow the fine adjustment of the amount of the molten metal to be poured into a casting mold with the immersion nozzle for pouring the molten metal into the casting mold at the time of continuous casting of the molten metal, such as Cu alloy, by constituting the stopper of this nozzle of a plug body part at the front end, an intermediate external thread part and a rotational operating part of an upper part. CONSTITUTION:The front end plug body 8 of the nozzle stopper 7 is pressed into a valve seat 4b provided in a hole 4a of a trough 4 or is risen to admit the molten metal from the hole 1a of the immersion nozzle 1 into the casting mold at the time of pouring the molten metal, such as Cu alloy, accumulated into the trough 4 from the hole 4a of the trough 4 into the continuous casting mold by the nozzle 1. The stopper 7 is constituted of the plug body part 8, the intermediate part formed with the external thread part 9 and the handle part 10 provided projectingly with plural rod bodies 10a in the upper part thereof. The external thread part 9 is screwed to the internal thread part 12 provided on the horizontal rod 11a of a support 11. The support 11 is vertically turned by a hydraulic cylinder 13 and the stopper 7 is exactly vertically moved by the meshing of the internal thread part 12 and the external threads provided on the stopper 7 and the rod bodies 10a of the handle part 10 are operated by a hook bar 17 to adjust the spacing between the plug body part 8 and the valve seat 4b. The prescribed amount of the molten metal is thus exactly poured into the continuous casting mold.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to continuous or semi-continuous casting in which molten metal is supplied to a mold with an open top end used when continuously casting slabs of copper-based alloys, etc. The present invention relates to a stopper control device for a submerged nozzle, and particularly to a control device for a stopper for a submerged nozzle suitable for a continuous or semi-continuous casting method in which molten metal is supplied to a mold with a large number of strands.

[Conventional technology]

In the continuous or semi-continuous casting method, the molten metal in the tundish or the molten metal discharged from the melting furnace into the gutter is injected into a water-cooled copper mold, cooled in the mold to solidify the molten metal sequentially, and the slab is continuously removed from the mold. This is a method of pulling it out.

In order to stably cast slabs with few casting defects using continuous or semi-continuous casting methods, it is necessary to keep the amount of molten metal supplied into the mold constant in order to prevent mold flux from getting caught up in the slab. is important.

Generally, as a mold for continuous or semi-continuous casting, a short through-hole mold is used which is composed of a pair of opposing short mold pieces and a pair of long mold pieces.

When supplying molten metal from a tundish or gutter into a mold, a submerged nozzle is attached to the bottom of the tundish or gutter, and the molten metal is jetted from the bottom of the nozzle and injected into the mold.

Conventionally, there are several types of jet nozzle shapes for this immersion nozzle, and a nozzle suitable for the type of molten metal to be cast and the shape of the mold is used. For example, when casting slab slabs of copper-based alloys by continuous or semi-continuous casting, it is necessary to
The use of a two-hole nozzle with an inverted cursor shape as shown in the figure has become common.

As shown in FIGS. 2 and 3, this nozzle generally has a cylindrical spout 2 along the center line of a cross section perpendicular to the casting direction of the nozzle 1. The water is attached to a tundish or gutter 4 so that the water is ejected parallel to the long sides of the mold 3.

A nozzle stopper 5 is provided for the above-mentioned nozzle 1, and the conventional nozzle stopper 5 is operated up and down by an air cylinder or hydraulic cylinder 6 attached to a tundish or @4 as shown in FIG. It looks like this.

Also, as this type of device, Japanese Patent Application Laid-Open No. 46-4358,
JP-A-46-5501, JP-A-49-92631,
The one described in JP-A No. 50-142432 is known.

[Problem to be solved by the invention]

However, all of the conventional nozzle stopper control devices described above open and close the nozzle by directly moving the nozzle stopper up and down using an air cylinder or hydraulic cylinder to control the amount of molten metal supplied. If the weight of the molten metal and high heat causes it to curve downward, and the center of the nozzle and nozzle stopper is misaligned, it will be impossible to control the uniform supply of molten metal to the mold, and it will be difficult to completely close the nozzle and nozzle stopper at the end of casting. There was a problem that it could not be fully opened.

Further, the nozzle stopper needs to be fully opened or fully opened quickly at the start and end of casting, but conventional control devices have the drawback of causing some time lag.

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

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

[Means to solve the problem]

In order to achieve the above object, the present invention is a control device for a nozzle stopper used in a continuous or semi-continuous casting nozzle. It is characterized in that a female threaded part provided on a vertically rotatable support is screwed into the male threaded part.

[Effect]

Next, to explain the operation of the present invention, 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 openings are formed at the bottom of a tundish or gutter communicating with the nozzles. The opening is opened by the plug at the tip of the nozzle stopper to allow the molten metal in the chamber to flow from the tundish or gutter to the immersion nozzle after the start of casting, and the opening is closed by the plug at the end of casting. to stop the flow.

In this way, when a large number of solidified ingots are continuously drawn vertically downward in continuous or semi-continuous casting, the amount of molten metal in the large number of molds may differ slightly, and such In this case, the amount of molten metal flowing into the nozzle stopper when the nozzle stopper is opened can be finely adjusted by slightly rotating the nozzle stopper using a rotating operation part (for example, a handle) on the top of the nozzle stopper.

The rotation operation section can be automatically operated by a device other than a handle.

In addition, even if the tundish or gutter is deformed due to the weight and heat of the molten metal, and the distance or center between the nozzle stopper plug and the nozzle opening at the bottom of the gutter is slightly off, the handle can be operated to pour the molten metal into multiple molds. Can be supplied uniformly.

Furthermore, if the molten metal still flows into the immersion nozzle even after the support is rotated and the nozzle opening is closed by the stopper at the tip of the nozzle stopper at the end of casting, the rotation operation section can be operated to completely stop the molten metal from flowing into the immersion nozzle. can be stopped.

〔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 spout 2 along the center line of a cross section perpendicular to the casting direction. The immersed nozzle 1 is attached to the bottom of the gutter 4, and a hole 4a bored in the bottom of the gutter 4 communicates with a flow path 1a leading to the spout 2 of the immersed nozzle 1. Moreover, the upper part of this hole 4a, ie, the bottom part 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 stopper part 8 made of carbon material at its tip, an intermediate part in which a male screw part 9 is formed, and a plurality of rods 10a protruding from the upper part. It is composed of a handle part 10 provided therein. The male threaded portion 9 is screwed into a female threaded portion 12 provided on the horizontal rod 11a of the support 11 holding the nozzle stopper 7. Also, the horizontal rod 11 of the support 11
A is provided with support rods 11b at both ends, and is rotated by a hydraulic cylinder 13 about its rotation center P.

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

In this embodiment, the number of strands shown in FIG. 4 is not limited to three, but can be applied to a large number of strands, such as two or more.

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

To dispense the hot water, first operate the hydraulic cylinder 13 to completely 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 then dispense the hot water into the gutter. When the molten metal is fully opened with a certain amount of molten metal accumulated, the molten metal flows into the nozzle 1 through between the stoppers 8 at the tips of the many nozzle stoppers 7 and the valve seats 4b facing each one, as shown in FIG. As shown, it enters the mold 3 through the spout 2 of the nozzle 1, is supported by the table 14, and is stored in the mold 3.

The molten metal supplied into the mold 3 is heated and begins to solidify sequentially, but after reaching a certain amount of molten metal stored in the mold 3, the table 14 is lowered vertically downward by a hydraulic cylinder (not shown). As shown in FIG. 5 or 6, the slab 15 is cast while forming a solidified shell 16.

With some molten metal remaining in the gutter, remove the nozzle stopper 7.
and an upper funnel-shaped valve seat 4b of the hole 4a communicating with the submerged nozzle 1.
The gap between the nozzle 1 and the flow path 1a is fully opened.
This is to prevent blockages caused by solidification of molten metal. When it is confirmed that the molten metal is ejected from the ejection port 2 of the nozzle 1 without deviation, the hydraulic cylinder 13 is operated again, and the valve seat 4b corresponding to the plug body 8 at the tip of the nozzle stopper 7 is The amount of molten metal flowing into the nozzle 1 through the gap does not compensate for the slab continuously drawn from the mold 3,
Plug body portion 8 and valve seat 4 that maintain a constant molten metal surface position in mold 3
The nozzle stopper 7 is lowered to the device until a proper gap is created.

At this time, the bottom of the gutter 4 may be deformed from the normal state shown in Fig. 5 to the one shown in Fig. 6 due to the weight and heat of the molten metal, but even if such deformation occurs, the nozzle The plurality of rods 10a of the upper handle 1o of the stopper 7 are operated by the hook rod 17, and the nozzle stopper 7 is rotated independently to adjust the gap between the plug body 8 at the tip and the valve seat 4, so that each rod body 10a is adjusted to a predetermined position. The opening degree can be ensured.

Furthermore, even if the centers of the stopper part 8 of the nozzle stopper 7 and the valve seat 4b of the gutter 4 are slightly deviated due to the deformation of the gutter 4, the operation of the handle 1o allows each nozzle 1 to be uniformly and independently distributed. Can supply molten metal.

In this way, when the slab 15 reaches a predetermined length and casting is completed, the hydraulic cylinder 13 is operated and each nozzle can be fully opened by the nozzle stopper 7. However, due to the deformation of the gutter 4, If there is a misalignment between the center and the gap between the stopper part of the nozzle stopper 7 and the valve seat 4b of the fl14, and the molten metal still flows into the nozzle 1, lower the nozzle stopper 7 by rotating it independently to ensure that the molten metal flows completely. can be stopped.

Furthermore, if it becomes difficult to continue casting due to the occurrence of various troubles during casting, the nozzle stopper 7 can be lowered by rotating it independently, and the supply of molten metal can be stopped while casting of other strands continues. Can be stopped.

〔Effect of the invention〕

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 all at once or each independently, so that it is possible to easily supply uniform hot water to each mold, and also to Even if the gutter deforms downward due to the weight of the molten metal and high heat, each nozzle stopper can be operated independently*v! Since it is possible to uniformly control the supply of molten metal to each mold, it is possible to improve the quality of each slab6.

[Brief explanation of drawings]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a front cross-sectional view of a mold, and FIG. 3 is a immersion nozzle. (a) is a longitudinal cross-sectional view, (b) is a side view, (c) is a cross-sectional view, Figure 4 is a front view, Figures 5 and 6 are a front cross-sectional view,
The figure is a sectional view of a conventional example. DESCRIPTION OF SYMBOLS 1... Immersion nozzle, 4... Gutter, 8... Plug part, 10... Handle part, 12... Female thread part,

Claims (2)

[Claims] (1) A nozzle stopper used in a continuous or semi-continuous casting nozzle. 1. A control device for a stopper for a casting nozzle, characterized in that a female screw portion provided on a rotatable support body is screwed. (2) The control device for a stopper for a casting nozzle according to claim 1, wherein the support body is rotatable in the vertical direction by a driving means such as a hydraulic cylinder.