JPS5841010Y2 - Antioxidant mounting device for continuous casting machine - Google Patents

Description

[Detailed explanation of the invention] This invention is designed to shield the injected molten steel between the ladle and tundish or between the tundish nozzle and the mold from the atmosphere during continuous casting.
An air-blocking diaphragm is installed around the open nozzle, and the inside of this diaphragm is filled with inert gas and positive pressure is created to completely shut off the outside air and the injected molten steel, thereby preventing oxidation of the injected molten steel and improving the quality of continuously cast pieces. This invention relates to an antioxidant mounting device that improves the

Conventionally, there are several types and mounting methods of antioxidants, such as a bolt mounting method in which the joint part of the antioxidant is bolted, and a notch and an engaging convex part that can be fitted into each other on the circumference of the joint part. This has been done using the so-called bayonet method, in which the device is installed and fitted and then rotated to engage, or the screw-in method, in which it is directly screwed together, but both methods require time and effort to attach and detach, and emergency measures are required for handling. There are occasional problems and it is not a perfect device.
Practical implementation was difficult.

In view of these points, this project was devised for the purpose of simplifying the mounting structure so that the antioxidant and its installation and removal can be done quickly and easily, and improving the airtightness of the external air cut-off by installation. will be explained with reference to the drawings.

A flange 4 is provided at the lower end around the spout on the bottom surface of the ladle that accommodates molten steel or the open nozzle 3 on the bottom surface 2 of the tundish 1.
A cylindrical fixing frame 5 is fixedly installed, and a flange 7 facing the flange 4 is provided at the upper end of a flexible cylindrical diaphragm 6 made of a heat-resistant mineral material that does not easily pass molten steel. An antioxidant 9 with an upper frame 8 attached thereto is provided, and an inert gas blowing port 10 is formed on the side of the upper frame 8 of the antioxidant 9 to which an inert gas blowing hose 11 is connected inside the cylindrical diaphragm 6. death,
Further, the opposing surfaces of the flange 7 of the oxidation preventer 9 and the flange 4 of the fixed frame 5 are finished flat so that there are no significant irregularities, and one of the opposing surfaces of the flanges 4 and 7 is coated with a magnetic material 1.
2, a magnet 13 is attached to the other side, a heat-resistant backing 14 is embedded in the upper frame flange part 1 to ensure sealing, and both flanges 4 and 1 are removably connected by the magnet 13. This is the structure of the preventer mounting device.

Considering that the fixed frame 5 and the upper frame 8 of the oxidation preventer 9 may be deformed by the heat of molten steel, their interiors are protected by water cooling or monolithic refractories to prevent deformation. In some cases.

This project has the above structure, and when using it, an antioxidant 9
When the upper frame flange 7 is aligned with the flange 4 of the fixed frame 5 provided on the bottom surface 2 of the tundish 1, the mutual flanges 4
, 7 by the magnetic body 12 and magnet 13 of both flanges 4, 7.
are suction-adhered, and the backing 14 maintains the airtightness of the connecting flange 4.7, and the lower end of the flexible cylindrical diaphragm 6 is attached to the upper surface of the mold 15, which moves up and down in the continuous casting machine. The injected molten steel 16 from the nozzle 3 of the tundish 1 to the mold 15 is surrounded and sealed by the cylindrical diaphragm 6 and is passed from the inert gas injection hose 11 to the inert gas injection port 10. By continuously feeding the inert gas 17 into the cylindrical diaphragm 6, the inside is filled with the inert gas and a positive pressure is maintained, so the injected molten steel 16 is completely isolated from the atmosphere and its oxidation is prevented. It can be prevented.

In addition, in the continuous casting apparatus, a receiving trough (lounter) 18 is installed between the tundish 1 and the mold 15 so as to be able to pivot freely around a pivot point so that the pouring of molten steel can be stopped and poured outside in case of an emergency. However, mold 15
In the event of an emergency such as a breakout or overflow, when the receiving gutter 18 is moved to the downstream position of the injected molten steel 16, the antioxidant 9 is pushed by the receiving gutter, overcomes the magnetic force, and is removed from the fixed frame 5. The injected molten steel 16 is blown away and falls into the receiving trough 1.
8 to allow for emergency treatment.

The above description has been about installing the oxidation preventer 9 on the bottom surface of the tundish 1, but even if this device is installed around the spout on the bottom surface of the ladle, the injected molten steel injected from the dowel into the tundish 1 will be surrounded by an inert gas. and antioxidant 9
Similarly, the injected molten steel can be completely shut off from the atmosphere by being enclosed and sealed, thereby preventing its oxidation.

According to the antioxidant mounting device using magnets of the present invention having the above-described configuration, it can be mounted and removed very easily and quickly, and even in the event of an emergency, it takes less time to remove bolts than in the past. It has significant practical effects, such as being able to quickly deal with accidents without requiring any additional equipment, being simple in structure, lightweight, and convenient to handle.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the proposed device installed around the nozzle under the kunditshu, Figure 2 is an exploded perspective view of the main parts showing the state of the proposed device before installation, and Figure 3 is the use of the proposed device. A vertical cross-sectional view showing the state. 1... Tanditshu, 2... Bottom,
3... Tuzzle, 4... Flange, 5...
... Fixed frame, 6 ... Cylindrical diaphragm, 7 ...
... Flange, 8 ... Upper frame, 9 ... Antioxidant, 10 ... Inert gas inlet, 12.
...Magnetic material, 13...Magnet.

Claims (1)

[Scope of utility model registration request] During continuous casting, a cylindrical fixed frame having flanges 4 around each nozzle 3 under the ladle or on the bottom surface 2 of the tundish 1 is used to block the injected molten steel between the ladle and the tundish or between the tundish and the mold from the atmosphere. 5 is attached, and an upper frame 8 having a flange 7 facing the flange 4 above a flexible cylindrical diaphragm 6 made of a heat-resistant mineral material.
and an inert gas inlet 10 is characterized in that one of the flanges 4 and 7 is made of a magnetic material 12, and the other is attached with a magnet 13, and the oxidation preventer 9 is removably connected tightly. Antioxidant installation device for continuous casting machine.