US 4,841,542 A · Electric furnace arrangement

Abstract

An electric furnace includes a furnace vessel arranged on a furnace platform and covered by a furnace lid liftable and lowerable by a lid lifting mechanism and pivotable from a position above the furnace vessel into a position lateral of the furnace vessel, and back, by a lid pivoting mechanism. A lid supporting framework pivotably mounted lateral of the furnace vessel and including at least one lid bracket is provided for lifting, lowering and pivoting the furnace lid. In order that the high-current cables are only slightly twisted when pivoting the furnace lid, despite the pivot axis for the furnace lid being arranged as close to the furnace vessel as possible, the lid supporting framework is pivotably connected with the furnace platform by an oscillating crank hinged to it. The lid supporting framework, under formation of a coupler, either is hinged to the furnace platform by means of a further oscillating crank under formation of a four-bar linkage or is guided with by one point along a guide arranged on the furnace platform under formation of a thrust crank.

Claims14

Dependent claims

In an electric furnace arrangement, such as an electric arc furnace or a plasma furnace, of the type including

a furnace platform,
a furnace vessel arranged on said furnace platform,
a furnace lid covering said furnace vessel,
a lid supporting framework pivotably mounted lateral of said furnace vessel for lifting, lowering and pivoting said furnace lid and including at least one lid bracket, a lid lifting mechanism for lifting and lowering said furnace lid and a lid pivoting mechanism for pivoting said furnace lid from a position above said furnace vessel into a position lateral of said furnace vessel and back, the improvement comprising oscillating crank means including a first oscillating crank hinged to said lid supporting framework pivotably connecting said lid supporting framework to said furnace platform, and a second oscillating crank provided hinged to said lid supporting framework, said supporting framework constituting a coupler to said furnace platform, thereby forming a four-bar linkage, whereby said four-bar linkage enables the lid-supporting framework to undergo a pivoting and swing motion when removing and returning said furnace lid.

1 more element

In an electric furnace arrangement, such as an electric arc furnace or a plasma furnace, of the type including

a furnace platform,
a furnace vessel arranged on said furnace platform,
a furnace lid covering said furnace vessel,
a rocking frame supported on said furnace platform,
a lid supporting framework pivotably mounted lateral of said furnace vessel for lifting, lowering and pivoting said furnace lid and including at least one lid bracket, a lid lifting mechanism for lifting and lowering said furnace lid and a lid pivoting mechanism for pivoting said furnace lid from a position above said furnace vessel into a position lateral of said furnace vessel and back, the improvement comprising oscillating crank means including a first oscillating crank hinged to said lid supporting framework pivotably connecting said lid supporting framework to said furnace platform, and wherein a guide means is arranged on said furnace platform to guide said lid supporting framework, said supporting framework constituting a coupler having cooperably associated therewith a thrust crank coupled to said oscillating crank with one end of said oscillating crank hinged to an arm 19 cantilevered to said supporting framework in the direction towards the furnace vessel and the other end of said oscillating crank pivotally connected to a column rigidly mounted on said rocking frame.

2 more elements

Dependencies are inferred from the claim text.

Electric furnace arrangement

Life of this patent

Electric furnace arrangement

Life of this patent

Abstract

Claims14