DE2121564A1 - Melting furnace - induction heating makes continuous scrap metal melting possible - Google Patents

Abstract

Scrapped cars and other scrap iron is melted continuously in an induction furnace, having an internal, conical, and conducting lining and being supported by a central foundation provided with melt outlets. The foundation is placed within a crucible and completely surrounded by molten iron. The earth bridge is via an electrode mounted in the crucible, while the magnetic connection is made via a horizontal yoke primary winding. Such a system may be used for single, double, or three phase supplies.

Description

Induction melting furnace for the continuous melting of car scrap and other light scrap. The invention relates to an induction melting furnace for the continuous melting of car scrap and other light scrap.

It is known that all known electric melting furnaces are used for melting down of car scrap or less compacted scrap have more or less major defects. The defects occur to the same extent in both arc and induction furnaces, With the well-known electric ovens, continuous operation is not possible because No material with the same temperature and temperature from the currently known furnace can be taken continuously and thus also on an electronic and Spectral-analytically controlled continuous melt line does not have a corresponding one Metallurgy can be performed.

It has long been the target of the solid feed metal industry and via the continuous casting process to the finished rolled profile material no thermal or accept other interruptions to the production flow.

The present invention shows one way through a new induction melting furnace with core or without core, all existing defects eliminated and the production flow fully solid feedstock through to the finish-rolled profile material.

The concept of the invention is described with reference to the figures from 1 to 4 and explained.

FIG. 1 shows a fusible body which is held conically downward in a corresponding manner (1) with its jacket (2), which for a possible suction of harmful gases Discharge lid (5) which is held in an annular collecting duct (4) will and fed via a discharge duct (5) for further cleaning or use will. The material fed in from above in direction (R) can also be used if it is strong is contaminated with flammable substances; be burned down in the downdraft, what the has the great advantage that no smoke gases get outside. When using Shredder material is protected by this precaution against any exhaust gases that may arise intercepted.

In the following ceramic part of the smelting furnace (6) there is a conical one Electrode sheath (7), this can be made of copper or another consist of a highly conductive, corrosion-resistant material. But closes on this coat (7) A material similar to electrodes, with high temperature and abrasion resistance, is flush with the contact laid out lower electrode jacket (8). The ceramic part (6) runs at the bottom into a pedestal (9) which has the outlet channels (10). This part of the But the pedestal (lo) rests in the melting pan (11) and is always made of the melt (12) and is itself made from highly refractory mass.

-To control the temperature of the melt (12) very precisely, the pan has (11) a high frequency winding (13). The electrode jacket (7) with a bridge (143 and a further electrode (15) provides a short-circuit with the melt (12) and the feedstock in a secondary sense. In this secondary development the yoke (16) is magnetically coupled to the primary winding (17) of the pan (11) is provided with a blanket (18) against radiation and safety.

The mode of operation is as follows: The pan (11) is when starting For example, filled with liquid pig iron and the heat loss is through the The high-frequency system (13) is incorporated into the system. The melting body is with scrap filled. If the ind @ ction system is now switched on, then flows in the secondary circuit a current with different specific cross-sectional loads. The flow of electricity of the furnace to the material over parts (7) and (8) with increasing Current density down and reaches at the lower end of (&) in the cross section the Melting temperature. At the weave of (8) above the outlet channels (io) the material avrcn resistance heat totally melted and overheated. The final temperature control takes over the high frequency device (13) in the pan (11). Through this, iniolge the conicity in the electrode sheaths (7) and (8), uneven heating, migrates the material itself works from top to bottom and is formally in the part (9) extruded from the furnace, resulting in an extraordinarily continuous operation of the furnace is guaranteed, The secondary current flow is through R1 in part (1) and R? marked in the electrode (15), the basic idea was based on Figure 1 so far the invention explained. There are several variants of the induction furnace technology combine, Figure 2 shows a design for 1-phase and 2-phase operation with two Fusion sets when the electrode (15) is omitted.

FIG. 3 shows a design for 3-phase operation with three fuses.

Finally it should be mentioned that before the primary windings of all three types of construction regulating transformers for the purpose of better control of the melting process upstream, which means that the furnace guidance system improves the energy supply at all times can steer.

FIG. 4 shows the same melting furnace but with high-frequency heating. Since in this case it is not a question of heating due to a specific current load on the cross-section, but the pure hysteresis energy, the Frequencies in the windings (19), (20), (21), etc., can be changed to reflect the melting process to keep perfectly in the GTiff.

The function of the high-frequency winding is of particular importance in this case (22) in the pan, because only with their help is it possible for the continuously flowing out Material to overheat. It will also be useful in this way of driving to be oiled up and burned off, how inventions such precautions are created, namely that the material with about 800 to 1 000 degrees Celsius in the high frequency Zone comes to save significant electricity costs.

Claims (5)

Claims 1. Electric induction melting furnace for continuous melting of car or other light scrap characterized in that in one after Conical melting furnace section at the bottom, conical electrode jackets (7) and (8) are installed in a way that makes contact with the material used and then the pedestal part (9) with horizontal outlet channels (10) follows, which is in a melting pan (11) rests and is completely surrounded by the melt (12), the short-circuit line ' via a bridge (14) and an electrode (15) standing in the melt (12) will, however, the magnetic 'coupling inductively to this short-circuit line through an inherently horizontal yoke (16) and the primary winding (17) takes place. 2. Electric induction melting furnace according to claim 1, characterized in that that the electrode (15) can be replaced by a further melting unit according to FIG can and the two melting sets are in the same pan (11) with a contact fit and are connected to a bridge (14) above the horizontal yoke (16). 3. Electric induction Schme @ furnace according to claim 2 thereby gekemnzeich, that the furnace according to Figure 3 can work 3-p @ asig, indol dlbsi melting sets in the the same pan (11) and the melting units above the horizontal yoke (16) are connected by three bridges. 4. Electrical induction melting furnace according to claim 3, characterized in that that the downward conical melting furnace body several separate from each other Has high-frequency windings, but each with different frequencies can work. 5. Electric induction melting furnace according to claim 4, characterized in that that through drainage holes (3) and a collecting ring channel (5) by burning Flue gases generated in the downward flow are discharged in the direction (R). L e r s e i t e