RU2813189C1 - Device for feeding and mixing steel in mold of continuous casting plant - Google Patents

Abstract

FIELD: steel casting.

SUBSTANCE: device for feeding and mixing steel in the mold of a continuous casting plant containing a casting ladle (1) and a vertical crystallizer (5), consists of a direct-flow submersible nozzle (2) installed on the casting ladle, and a closed-bottom nozzle (3) with outlet windows (4). The closed-bottom nozzle is made of a square cross-section and is installed with a gap on the direct-flow submerged nozzle with the possibility of rotation relative to it. The outlet windows are made symmetrical, which contributes to the creation of a reactive force that rotates the dead-bottomed glass around the direct-flow glass when the steel exits the closed-bottom nozzle into the mold.

EFFECT: homogeneous structure of the resulting ingot is ensured due to the possibility of intensifying the mixing of steel while excluding its emissions into the slag area.

1 cl, 1 dwg

Description

The invention relates to metallurgy, in particular to continuous casting of steel.

The closest to the claimed device is the device described in patent RU 2760696, publ. November 29, 2021, bulletin. 34. A device for feeding and mixing steel in the mold of a continuous casting installation, containing a direct-flow submersible nozzle mounted on a casting ladle, characterized in that it contains a solid-bottomed nozzle installed with a gap on the direct-flow submersible nozzle with the possibility of rotation relative to the latter, made of ceramic, providing the ability to keep it afloat in liquid steel in the crystallizer, and in the solid-bottomed glass there are eccentrically located outlet windows directed along the generatrix of the solid-bottomed glass in a horizontal section.

The disadvantage of such a device is the throwing of liquid metal into the slag area (it is even possible to capture part of the slag into the liquid metal), with intensive mixing (speed n ≥ 30 rpm) of the liquid metal in the volume of the vertical crystallizer, which leads to a decrease in the homogeneity of the structure of the crystallizing steel and quality of the resulting continuous ingot.

The inventive device contains a solid-bottomed rotating glass, made with a square cross-section and symmetrically located outlet windows, equipped with a forced rotation mechanism.

The technical result obtained by implementing the claimed device is to increase the homogeneity of the structure of a continuous ingot due to the ability to intensify mixing by eliminating emissions of liquid metal into the slag area at n ≥ 30 rpm.

Limiting features: pouring ladle, vertical crystallizer, direct-flow submersible nozzle, dead-bottom rotating nozzle.

Distinctive features: the solid-bottomed rotating glass has a square cross-section, symmetrically located outlet windows, is equipped with a mechanism for forcing its rotation and a cross on its outer bottom part.

The cause-and-effect relationship between the set of essential features of the proposed device and the achieved technical result is as follows.

The device contains a casting ladle with a direct-flow immersion nozzle inserted with a gap into a dead-bottom immersion nozzle having a cross-section in the form of a square and symmetrically located windows for the exit of liquid steel into the mold. When metal exits the dead-bottomed glass into the crystallizer, due to the symmetry of the windows, a reactive force is created that promotes rotation of the dead-bottomed glass around the direct-flow glass. This eliminates the possibility of emissions of liquid metal into the slag area, and slag into the metal at n ≥ 30 rpm.

The drawing shows the appearance of the device. The inventive device consists of a casting ladle 1 with a submersible direct-flow nozzle 2, a solid-bottomed submersible nozzle of square cross-section 3 with eccentric outlet holes 4, a crystallizer 5, a gearbox 6, a thrust bearing 7, a motor 8.

Operation of the device: liquid metal from ladle 1 through a submersible direct-flow nozzle 2 enters a deep-bottomed submersible nozzle 3 of square cross-section, from where it exits through symmetrical windows 4 into the crystallizer 5. Jets of liquid metal emerging from symmetrical windows create a rotational moment that sets in motion (rotation) bottomless glass. Due to the rotation of the solid-bottomed glass, the jets of liquid metal emerging from the symmetrical windows will create the effect of its mixing, which is further enhanced by the square edges of the rotating solid-bottomed glass. The depth of immersion of a dead-bottom glass is regulated both by the mass of the glass itself and by weight washers. The blind-bottom cup is driven into rotation by a DC motor 8. The vertical position of the rotating cup is controlled by the thrust bearing 7 and the gearbox 6. The DC motor 8 can smoothly change the rotation speed in the process of pulling the ingot from the mold, selecting the desired rotation speed to obtain a high-quality structure of a continuous ingot.

Claims (1)

A device for feeding and mixing steel in the mold of a continuous casting installation having a casting ladle and a vertical crystallizer, containing a direct-flow submersible nozzle mounted on the casting ladle, a solid-bottom nozzle with a square cross-section and outlet windows, installed with a gap on the direct-flow submersible nozzle with the possibility of rotation relative to the latter, characterized in that the output windows are made symmetrical.

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