RU2814101C1 - Device for feeding and mixing steel in mould of continuous casting unit - Google Patents

Abstract

FIELD: steel casting.

SUBSTANCE: device for feeding and mixing steel in vertical mould (4) of a continuous casting installation contains closed-bottomed submersible nozzle (2) with outlet windows (3), installed on casting ladle (1), and submersible refractory screws (5). Immersion refractory screws are installed on the wide edge of the crystallizer symmetrically from the closed-bottomed ladle and are equipped with individual mechanisms for forced rotation and movement in the vertical direction. Due to individual drive (6) for rotation and movement of the screws in the vertical direction, regulation of the intensity of mixing and the depth of installation of the screws in the mould is ensured, which makes it possible to eliminate the throw of liquid steel into the slag area during mixing.

EFFECT: obtaining a homogeneous fine-grained structure of a continuous ingot drawn from the crystallizer.

1 cl, 1 dwg

Description

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

The closest to the claimed device is a device for feeding and mixing steel in the mold of a continuous casting installation, containing a solid-bottomed immersion glass with outlet windows and equipped with a fireproof jacket with vertical ribs installed with a gap on the outer surface of the solid-bottomed glass above its outlet windows, connected to its mechanism forced rotation (patent No. 2764446 RU, published 01/17/2022).

The disadvantage of such a device is the complexity of manufacturing, the throwing of liquid metal with intense mixing (speed n ≥ 30 rpm) into the slag area (slag pad).

The technical result obtained by implementing the claimed device is to increase the uniformity of the fine-grained structure of a continuous ingot drawn from the crystallizer, due to the ability to install screws at any depth of the crystallizer and thereby eliminate the throw of liquid metal into the slag area at any mixing intensity (screw rotation speed).

The claimed device contains submersible refractory screws installed symmetrically from a solid-bottomed glass on the wide edge of the crystallizer and equipped with individual mechanisms for forced rotation and movement in the vertical direction.

Limiting features: pouring ladle, vertical crystallizer, solid-bottomed immersion nozzle.

Distinctive features: symmetrically from the immersion nozzle, on the wide edge of the crystallizer, immersion refractory screws are located, equipped with individual mechanisms for forced rotation and movement in the vertical direction.

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 pouring ladle with a dead-bottomed submersible nozzle. Symmetrically from the immersion nozzle there are immersion refractory screws equipped with individual mechanisms for forced rotation and movement in the vertical direction. The mixing intensity is increased by regulating the rotation speed; metal overflow into the slag area does not occur due to the possible movement of the screws in the vertical direction - deep into the mold. All this contributes to obtaining a homogeneous fine-grained structure of a continuous ingot drawn from the crystallizer.

The drawing shows the appearance of the continuous casting device. The continuous casting device consists of an intermediate casting ladle 1 with a submersible blind-bottom nozzle 2 with outlet windows 3, a crystallizer 4, refractory submersible screws 5 with a rotation drive 6, and DC motors 7.

Device operation.

Liquid metal from ladle 1 through the bottomed submersible nozzle 2 enters the windows 3 and exits into the crystallizer 4. Due to the rotation of the submersible screws 5 by means of drives 6, the metal is mixed in the crystallizer. The rotation speed is controlled by 7 DC motors. The central shaft of each screw has the ability to move in the vertical direction. By adjusting the amount of movement and rotation of the screws, the operating mode is set so that there is intensive mixing of the liquid metal in the crystallizer without throwing the metal into the slag area. By selecting the desired operating mode of the screw group, we obtain a high-quality structure of a continuous ingot.

Claims (1)

A device for feeding and mixing steel in a vertical mold of a continuous casting installation, containing a solid-bottomed submersible nozzle with outlet windows, installed on a casting ladle, characterized in that it contains submersible refractory screws installed symmetrically from the solid-bottomed nozzle on the wide edge of the mold and equipped with individual forced rotation and movement in the vertical direction.

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