JPS6027564Y2 - Equipment for removing accumulated powder at the bottom end of continuous casting molds - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for removing mold powder deposited in the gap between the lower end of a continuous casting mold and a foot shoe or cooling plate. The present invention attempts to propose a device for removing deposited mold powder that can compensate for the lack of powder removal effect and completely remove deposited mold powder.

In order to improve the productivity of continuous casting machines, a method has been adopted in which molten steel of the same copper type or different steel types is continuously cast.
At this time, if the tundish or the immersion nozzle is replaced continuously while casting continues, a large amount of mold powder will flow between the mold and the foot shoe or between the mold and the cooling plate.

This molding powder comes to be deposited in various states such as granular, sintered, and molten forms in the form of lumps.

FIG. 1 is an explanatory diagram showing the state in which the mold powder as described above is deposited.

Conventionally, a method of spraying mold spray 3 to prevent the deposited mold powder 4 from being deposited has been taken, but even by spraying this mold spray 3, it is not possible to completely wash away the mold powder 4. It is deposited without any gaps in the space between the mold and the foot shoe 5 or the cooling plate.

In such a state, the cooling of the slab 2 is reduced by the deposited powder 4, resulting in insufficient cooling and playout, and furthermore, the water trapped by the deposited powder 4 causes molten steel to blow up from within the mold. A phenomenon occurs.

This idea was made to solve the problems of the conventional mold spray for removing accumulated mold powder. A device for removing deposited mold powder is provided with a high-pressure spray nozzle attached to the side.

This idea is based on a high-pressure spray jet that sprays water perpendicular to the injection direction of the mold spray nozzle and parallel to the long side of the mold, into the gap on both sides formed between the lower end of the long side of the mold and the upper end of the foot shoe or cooling plate. - A device for removing deposited mold powder with nozzles located on the outside of both ends of the mold so that they can spray the mold powder in opposite directions.

This invention will be explained below with reference to drawings of embodiments.

In this device, high-pressure spray nozzles are installed facing each other at both ends of the gap between the bottom end of the mold and the foot shoe or cooling plate, and the spray direction is directed toward the short side of the other end. It is something that will be done.

FIG. 2 is a drawing showing an embodiment of this invention, in which a mold is constituted by a long side 1, a short side 6, and a back plate 8, and a mold spray nozzle 3 is installed in the gap between the lower end of the mold and the foot shoe 5. is provided so as to inject at right angles to the slab 2.

The high-pressure spray nozzle 7 of this invention is installed so as to be located in the gap between the lower end of the mold and the foot shoe, and the spray direction of the high-pressure spray nozzle 7 is from one short side to the other short side. The spraying direction of the mold spray nozzle 3 is perpendicular to the injection direction and the spraying direction is parallel to the long side 1 of the mold, and the high pressure spray nozzles are installed opposite to each other on the outside of the short side at both ends of each long side of the mold.

Figure 3 shows a sectional view taken along line A-A in Figure 2.
The high-pressure spray nozzle 7 is parallel to the long side 1 and perpendicular to the mold spray nozzle 3 so that the short side of the mold in the gap between the long side 1 of the mold and the foot shoe 5 can be cleaned along the long side 1 of the mold. It is installed in

In continuous casting, if a large amount of mold powder accumulates as shown in Figure 1, the cooling effect of the mold spray nozzle 3 on the slab 2 will be poor, so before such a situation occurs, the high-pressure spray nozzle should be removed. Cleaning and removal is performed by alternately and intermittently spraying a large amount of water at a high speed of 9/a1 or higher from 7 to 15 from the high pressure spray nozzles 7 installed facing each other.

Next, an example of this invention will be described in detail.

In the continuous casting example, immediately before replacing the immersion nozzle and replacing the tundish, the casting speed was changed from the steady speed to 0.8 m/m.
decreases to in.

At this point, the injection of the mold spray nozzle is temporarily stopped, and a high-pressure spray with a pressure of 15 kg/af1 or more is injected from one of the short sides of the mold.

This high-pressure spray blows away any accumulated mold powder that has flowed between the mold and the slab.

After spraying with the above high-pressure spray nozzle for 2 minutes, the spray is stopped, and another high-pressure spray installed opposite is sprayed for 2 minutes from the other short side.

After repeating this type of spraying 2 to 3 times and confirming that the mold powder accumulated in the gap between the mold and the foot shoe has been cleaned and removed, the high-pressure spray nozzle stops spraying and the mold spray nozzle restarts spraying. Then, steady continuous casting was resumed.

If the high pressure spray nozzle of this invention is installed and the accumulated mold powder is discharged and removed according to the accumulation state of the accumulated mold powder that occurs between the mold and the foot shoe, the mold spray can be removed. The desired cooling effect can be achieved without being interfered with by the accumulated powder, and accidents such as molten steel blowing up in the mold and breakout caused by the accumulation of mold powder are eliminated.

In this devised apparatus for removing accumulated mold powder at the lower end of the mold, it is extremely easy to install the high-pressure spray nozzle, and the high-pressure spray nozzle can be sprayed and cleaned at any time depending on the accumulation status of the accumulated mold powder at the lower end of the mold. This is an excellent device for removing accumulated mold powder that is effective and suitable for actual situations.

[Brief explanation of drawings]

The attached drawings are schematic diagrams showing an example of an embodiment of the device of this invention, in which Fig. 1 is an explanatory diagram showing the state of deposition of mold powder, Fig. 2 is a schematic sectional view of high-pressure spray nozzle installation, and Fig. 3 is a schematic diagram showing an example of the embodiment of the device of this invention.
The diagram shows the A-A homeland in Figure 2. 1... Long side of the mold, 2... Slab, 3...
・Mold spray nozzle, 4...Mold powder, 5...Foot shoe, 6...
Mold short side, 7... High pressure spray nozzle, 8...
...Back plate.

Claims (1)

[Scope of utility model registration request] High-pressure spray nozzles that spray in a direction perpendicular to the injection direction of the mold spray nozzle and parallel to the long side of the mold are facing each other on the outside of each end of the gap formed between the lower end of the long side of the mold and the foot shoe or cooling plate. A device is installed to remove accumulated powder at the bottom end of a continuous casting mold.