JPS6310205Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a long nozzle connected to an inlet for injecting molten steel from a ladle to a tundish in continuous casting equipment, and its mounting device.

In general, when pouring molten steel in the continuous casting process, it is effective to use a long nozzle to prevent secondary oxidation of the molten steel flow and to prevent metal adhesion to the tundish cover caused by hot water splashing. It is.

However, the conventional long nozzle mounting device
As shown in Figures A and B, one end of a long nozzle 4 is pivotally supported by a fixed pin 3 to a slide case 2 provided on the lower surface of the ladle 1, and the other end of the long nozzle 4, which is suspended horizontally, is attached to a pin 5. Alternatively, the slide case 2 may be provided with a slit groove 6 having two or three engaging portions 6a, and the protrusion 7 provided on the support fitting of the long nozzle 4 may be inserted into the slit groove 6.
A method has been adopted in which the connector is inserted into the connector and rotated to the engaging portion 6a to be fixed. 8 in the figure is a tundish.

However, in the former mounting device in the conventional device described above, the slide case 2 and the long nozzle 4
There were drawbacks such as insufficient sealing performance with the mating part, which caused air to be drawn in from the engaging portion, and the installation was difficult due to the heavy weight since the installation had to be done manually by workers.

In addition, with the latter mounting device, if the weight of the long nozzle is heavy, the strength of the support part to which the long nozzle 4 of the slide case 2 is mounted becomes a problem. was difficult.

This idea was made to solve the above-mentioned drawbacks of the conventional structure, and is effective when using a large long nozzle, does not require skill to install the long nozzle, and is suitable for molten steel injection operations. The present invention provides a long nozzle and its mounting device, which are intended to prevent secondary oxidation of the injection stream and also prevent metal adhesion to the tundish cover caused by hot water spraying.

Hereinafter, one embodiment of this invention will be explained in detail based on FIGS. 2 to 7. FIG. 2 is a cross-sectional view of the main parts of a mounting device for a long nozzle 10 according to an embodiment of this invention.
1, a slide case 13 and a slide nozzle 14 are installed via a ladle valve 12. In addition, at the bottom of the ladle 11, rails 15 are provided on both sides of the slide case 13 with heat insulating plates 1.
It is installed via 6.

Further, the long nozzle 10 attached to the slide case 13 of the ladle 11 is placed on a truck 18 via an Ar gas seal box 17, and this truck 18 is attached to a mounting device 19 with a jack 20 so that it can rise and fall freely. There is.

A guide wheel 21 is pivotally attached to the cart 18 on which the long nozzle 10 is placed, and the ladle 11
It is designed to be able to move on rails 15 provided in the. Further, a caster 22 is attached to the mounting device 19, and the long nozzle 10 is placed in a predetermined position.
The mounting device 19 on which the is mounted can be moved. In the figure, 23 is an Ar gas supply pipe, and 24 is a seal board that seals the slide case 13 and the Ar gas seal box 17 when the long nozzle 10 is installed.

Next, a method for attaching the long nozzle according to the invention constructed as described above will be explained in detail. First, as shown in Fig. 3, the long nozzle 1 is
0 is connected to trolley 1 via Ar gas seal box 17.
8 and set in the mounting device 19. The mounting device 19 on which the long nozzle 10 is placed is a ladle 11 lifted by a crane or the like.
Move it below.

Then, by operating the jack 20 of the mounting device 19, the long nozzle 10 is raised to a position where the guide wheels 21 of the truck 18 rest on the rail 15 installed on the ladle 11, as shown in FIG.
The slide case 13 is fitted into the Ar gas seal box 17 and sealed with a seal board 24. Next, the truck 18 is turned 90 degrees and the guide wheels 21 are placed on the rails 15 as shown in FIGS. 5A and 5B. In this state, the ladle 11 is suspended as shown in FIG. 6, the mounting device 19 is moved, and molten steel is injected into a predetermined tundish 25 as shown in FIG. The space between it and the slide nozzle 14 is sealed off with Ar gas to prevent outside air from entering.

Note that in the above configuration, the slide nozzle 14
The long nozzle 10 moves along the rail 15 according to the movement of the
It is constructed so that it can be easily moved by upper guide wheels 21, and the ladle valve is opened and closed by moving the long nozzle 10 in the direction of the arrow.

Further, in the figure, 26 is a hook for lifting the ladle 11, and 27 is a trunnion on which the ladle 11 is pivotally attached to the hook 26.

As explained in detail above, the long nozzle mounting device according to this invention is such that the long nozzle is set on the trolley, the slide case is sandwiched between the heat insulating plate of the ladle valve, rails are provided on both sides, and the long nozzle set on the trolley is mounted. The structure is such that the long nozzle is placed on a rail and can be easily moved in accordance with the movement of the slide nozzle.The structure is simple, and the work of installing the long nozzle is extremely easy. In addition, since manual work is not required, it does not require any skill and saves labor.In addition, it has the effect of reducing the load on the slide case, and seals with Ar gas can be used to seal between the long nozzle and the slide case. There is no air intrusion, it prevents secondary oxidation of the molten steel flow, and it is possible to prevent base metal from adhering to the tundish cover caused by hot water splashing.

[Brief explanation of the drawing]

1A and 1B are side views of a long nozzle attachment part showing a conventional embodiment, FIG. The figure is an explanatory diagram showing the sequence of the long nozzle attachment method according to this invention. 10...Long nozzle, 11...Ladle, 1
2...Ladle valve, 13...Slide case, 14...Slide nozzle, 15...Rail,
16...Heat shield plate, 17...Ar gas seal box, 18...Dolly, 19...Mounting device, 20...
Jacket, 21... Guide wheel, 22... Caster, 23... Ar gas supply pipe, 24... Seal board.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A slide nozzle is installed at the bottom of the ladle via a ladle valve, and rails are installed on both sides of the slide case via heat shields,
The long nozzle that fits into the slide case is suspended and held via an Ar gas seal box on a trolley with a guide wheel pivotally attached to the upper part, and the trolley is placed on a mounting device so as to be able to rise and fall freely, and then the general installation is carried out. The long nozzle is moved below the ladle by the caster at the bottom of the device, and the cart is raised to a position where the long nozzle fits into the slide case of the ladle and the guide wheels rest on the rails of the ladle, and the cart is rotated 90 degrees. A long nozzle in which the guide wheel is placed on a rail, and its mounting device. (2) The rail of the ladle is configured to have a length that allows the ladle valve to be opened and closed by moving the guide wheels of the trolley that holds the long nozzle back and forth in accordance with the movement of the long nozzle. The long nozzle and its mounting device described in 1).