JPS6159827B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved nozzle clogging prevention material that can prevent the nozzle hole of a molten metal outflow device from being clogged due to solidification of molten metal during steel receiving.

In general, this type of molten metal outflow device, such as a sliding nozzle device installed in a ladle, tundish, etc., is composed of an upper nozzle, a fixed plate, a sliding plate, a lower nozzle, etc. By opening and closing the nozzle hole, the amount of outflow of molten metal in the ladle is adjusted or stopped.

However, when receiving molten metal into a container such as a ladle or tundish that is equipped with the above-mentioned sliding nozzle device, the inside of the nozzle hole of the container cannot be sufficiently preheated to the temperature of the molten metal even if the inside of the container is preheated. The injected molten metal flows into the upper nozzle of the device and the nozzle hole of the stationary plate whose temperature is lower than this temperature, and is cooled and solidified. Therefore, there was a problem in that even if the nozzle hole was opened by sliding the sliding plate, the molten metal could not flow out.

For this reason, conventionally, the lower nozzle of the sliding nozzle device and the nozzle hole of the fixed plate are filled with filler such as graphite, natural silica sand, wood chips, iron oxide powder, etc., and when the molten metal is injected, the molten metal is This prevents the filling material from entering the nozzle hole, and allows the filling to fall together with the molten metal when the nozzle hole is opened. However, due to the extension of the residence time of molten metal in the ladle and the increase in temperature of molten metal mainly due to the development of casting technology, conventional fillings do not allow the molten metal to float to the top surface or inside the nozzle hole. It had the disadvantage that it was sintered and solidified, making it unable to fully demonstrate its effects. In particular, when the compact is sintered, it is necessary to melt the solidified filling using an oxygen lance and drain the molten metal in the ladle, which is an extremely dangerous operation.

The present invention has been made to eliminate such drawbacks of the conventional technology, and it is possible to prevent molten metal from floating to the upper surface even if it remains in a ladle for a long time, and also to prevent the molten metal from solidifying in the nozzle hole. It is an object of the present invention to provide a material for preventing clogging of a nozzle hole for a molten metal discharge device, which can fall together with the molten metal when the hole is opened, and can facilitate the outflow of the molten metal.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

In the figure, reference numeral 1 denotes a nozzle hole blocking prevention material, and on top of this prevention material 1, an upper plate 2 made of a fireproof material such as graphite or alumina is provided. The upper plate 2 includes a ring-shaped outer plug 3 having a truncated cone-shaped hole that has approximately the same diameter as the nozzle hole of the molten metal outflow device, and a conical outer plug 3 fitted so as to be able to fall into the outer plug 3. It is composed of a trapezoidal inner plug 4. Further, a bottomed cylindrical storage body 5 made of an easily breakable sheet smaller in diameter than the outer plug 3 is provided at the lower part of the outer plug 3. The container 5 is filled with a granular refractory filling 6, and the inner plug 4 is always fitted into the outer plug 3 within the nozzle hole unless the filling 6 is discharged from the container 5. maintained in the state.

The storage body 5 used in the present invention is made of a sheet that is easily damaged, such as a thin plastic sheet, cardboard, or thin paper.

The granular fire-resistant filling used in the present invention includes:
Examples include graphite particles, natural silica sand particles, alumina particles, iron oxide particles, etc., and those having a particle size of 0.5 to 2 mm are usually used.

According to such a configuration, when flowing molten metal into a ladle in which a sliding nozzle device 8 is installed on a mass brick 7 at the bottom as shown in FIG. 2, the nozzle holes 10 of the sliding plate 9 of the device 8 Then, insert a nozzle hole blocking prevention material 1 as shown in FIG. The drive shaft 13 is then welded to the drive shaft 13.
By sliding the sliding plate 9 and storing the preventive material 1 in the nozzle hole 10', the preventive material does not float to the upper surface of the molten metal in the ladle and prevents melting in the ladle. Even if the residence time of the metal becomes long, it is possible to prevent the refractory filling from sintering and solidifying within the nozzle hole.

Further, when the nozzle holes 10, 10' are opened by sliding the sliding plate 9 as shown in FIG.
The bottom part is easily torn open, and the filled granular fire-resistant filling 6 falls out, and the outer plug 3
Since the inner stopper 4 fitted into the ladle falls under the pressure of the molten metal and the outer stopper 3 is opened, the molten metal in the ladle can easily flow out from the hollow hole of the outer stopper 3. In this case, the outer plug 3 falls or disappears during the outflow of molten metal and is removed.

The structure of the nozzle hole clogging prevention material of the present invention is not limited to that of the above-mentioned embodiments, but may be structured as shown in FIG. 4 or 5, for example.

That is, the nozzle hole clogging prevention material 1' shown in FIG. The upper plate 2' is formed by a cylindrical inner plug 4' fitted in such a manner that it can be dropped, and a storage body 5' having the same diameter as the outer plug 3' is provided on the outer plug 3'.

The nozzle hole clogging prevention material 1' shown in FIG.
is installed vertically. That is, a rod 15 with an inverted conical body 14 is provided so as to be embedded in the refractory filling 6 within the storage body 5. According to such a configuration, when the housing 5 of the preventive material 1'' is torn when the nozzle hole is opened and the refractory filling 6 therein falls, the filling will fall into the inverted cone of the rod 15 provided in the inner stopper 4. Since the inner stopper 4 is pushed against the body 14 and the outer stopper 3 is easily opened, the molten metal in the ladle can quickly flow out.

Furthermore, in the present invention, the upper plate and the storage body are separate bodies, for example, after the upper plate is inserted into the nozzle hole in advance, the storage body made of a plastic bag or the like filled with fire-resistant powder is moved using an appropriate jig. The nozzle hole blocking prevention material may be configured by inserting the material until it touches the lower surface of the upper plate. In this case, it goes without saying that the upper plate needs to be formed from an outer plug and an inner plug.

As described in detail above, according to the present invention, when molten metal is injected, the molten metal does not float to the upper surface of the molten metal, and when the molten metal stays, it is prevented from entering into the low-temperature nozzle hole. A nozzle for discharging molten metal that can prevent solidification within the hole, and also allows the molten metal to easily fall together with the molten metal when the nozzle hole is opened, allowing the molten metal to quickly flow out of a ladle, etc., without the need for dangerous oxygen lance work. It is possible to provide a material for preventing pore clogging.

The nozzle hole clogging prevention material of the present invention is not limited to sliding nozzle devices, but can be similarly applied to rotary nozzle type devices and bottom pouring devices.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the nozzle hole clogging prevention material for a molten metal outflow device of the present invention, and Figs. 2 and 3 show the application of the nozzle hole clogging prevention material of the present invention to a sliding nozzle device. 2 shows the sliding nozzle device in the closed state, FIG. 3 shows the sliding nozzle device in the open state, and FIGS. 4 and 5 show other embodiments of the present invention. It is a sectional view of the nozzle hole clogging prevention material for the molten metal outflow device shown. 1, 1', 1''... Nozzle hole clogging prevention material, 3,
3'... Outer plug, 4, 4'... Inner plug, 5, 5'... Storage body, 6... Fire-resistant filling, 8... Sliding nozzle device, 10, 10'... Nozzle hole, 14 …
...inverted cone, 15...rod.

Claims (1)

[Claims] 1. An upper plate consisting of an outer plug having approximately the same diameter as the nozzle hole diameter of the molten metal outflow device, and an inner plug fitted so as to be able to fall into the outer plug, and an upper plate provided at the lower part of the outer plug of this upper plate. A storage body made of easily damaged sheets;
A nozzle hole clogging prevention material for a molten metal outflow device, comprising: a granular fire-resistant filler filled in the storage body.