Arc furnace

Patent metadata

Field	Value
Publication number	US-9657994-B2
Application number	US-201314413639-A
Country	US
Kind code	B2
Filing date	Jun 12, 2013
Priority date	Jul 11, 2012
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

An arc furnace having a furnace vessel for melting steel, a cover for closing the furnace vessel and a pivot unit with which the cover can be moved away from the furnace vessel in which the furnace vessel is mounted so as to be movable in the vertical direction relative to the pivot unit, and the pivot unit has a holder for releasably fixing the cover in the vertical direction.

First claim

The invention claimed is:

1. An arc furnace comprising:
a furnace vessel for melting steel,
a cover for closing the furnace vessel, the cover including a connection element,
a swivel unit by means of which the cover is moved away from the furnace vessel, the swivel unit including a holder,
a cradle configured to move in the vertical direction below and above an engagement position to selectively fix and release the cover from the swivel unit,
struts arranged on the cradle to move vertically with the cradle, the struts supporting the cover when the cover is operated to close the furnace vessel and disengage from the cover after the cover is releasably fixed to the swivel unit wherein:
a) the furnace vessel is mounted to be movable in a vertical direction relative to the swivel unit, and
b) the holder and the connection element engage to fix the cover to the swivel unit when the cradle is moved in a vertical direction below the engagement position, and the holder and the connection element disengage to release the cover from the swivel unit when the cradle is moved in the vertical direction above the engagement position,
wherein the furnace vessel is mounted in the cradle.

2. The arc furnace as claimed in claim 1 , further comprising hydraulic cylinders at the cradle located and configured for moving the cradle in the vertical direction.

3. The arc furnace as claimed in claim 2 , further comprising a plurality of the hydraulic cylinders which are activated separately.

4. The arc furnace as claimed in claim 3 , wherein the swivel unit is stationary in the vertical direction.

5. The arc furnace as claimed in claim 2 , wherein the swivel unit is stationary in the vertical direction.

6. The arc furnace as claimed in claim 1 , wherein the cover is supported to be movable away from the furnace vessel by the swivel unit, employing a rotational movement about an axis which extends in a vertical direction.

7. The arc furnace as claimed in claim 6 , wherein the swivel unit is stationary in the vertical direction.

8. The arc furnace as claimed in claim 1 , wherein the swivel unit is stationary in the vertical direction.

Assignees

• Primetals Technologies Austria GmbH

Inventors

• Mossmann Björn

Classifications

• F27D11/08 Primary

  Heating by electric discharge, e.g. arc discharge · CPC title

• F27B3/065

  tiltable · CPC title

• F27B14/06

  heated electrically, e.g. induction crucible furnaces with or without any other source of heat (F27B14/04 takes precedence) · CPC title

• F27B14/12

  Covers therefor · CPC title

• F27D1/1816

  Removable covers specially adapted for arc furnaces · CPC title