DE20014593U1 - Pouring device of a melt vessel - Google Patents

Description

D 16 F 11/00

KEIL & SCHAAFHAUSEN

PATENT ATTORNEYS

Didier-Werke AG Abraham-Lincoln-Straße 1

65189 Wiesbaden

Pouring device of a melting vessel

23.08.00

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D 16 F 11/00

Keil&Schaafhausen

PATENT ATTORNEYS

Pouring device of a melting vessel

The invention relates to a pouring device of a vessel for receiving melt, in particular metal melt, e.g. of an electric arc furnace, with a e.g. sleeve- or tubular-shaped, e.g. monolithic pouring body forming a tapping channel made of a refractory material that can be coupled to an inductor for heating, which projects with its lower outlet end beyond the metal bottom wall of the melting vessel and can also be inductively coupled there.

Such a pouring device is known from DE 196 44 345 A1. In this case, the pouring spout is closed by the frozen melt before pouring, at least in the area of its inlet. Pouring is achieved by means of an inductor which is located away from the inlet, but which induces electromagnetic energy in the area of the outlet of the pouring spout, which generates a temperature increase at least in the area of the inlet. The only inductor is arranged both inside and outside the metal bottom wall. The inductor extends into the slide frame. Before the melt is poured into the vessel, a closure element with an extension is inserted into the pouring sleeve, which extends into the inductor arranged in the area of the outlet and consists of an electrically conductive inductively coupled ceramic. During inductive coupling, the extension transmits

23.08.00

D 16 F 11/00

Keil&Schaafhausen

PATENT ATTORNEYS

Heat is transferred to the closure element through heat conduction, which then melts through, thereby initiating the casting process. The extension is designed, for example with slots, in such a way that an electromagnetic secondary field is created in the inlet area when the inductor is switched on. The extension is heated in the outlet area by the inductor's main field, but this is only partially successful. In the area between the inductor's main and secondary fields, there is virtually no inductive heating.

The object of the present invention is to propose a pouring device of the type mentioned at the outset, in which the column of melt, in particular metal melt, filling the entire tapping channel can be kept liquid or remelted down to the lower closure level, and this can be done using simple means.

This task is solved in a pouring device of the type mentioned at the beginning in that the projection or extension of the pouring body that protrudes beyond the metal bottom wall is assigned an additional inductor or inductor section that can be operated independently of the pouring body section located within the bottom structure of the melting vessel, in particular an additional inductor or inductor section that can be controlled or regulated. Both inductors can also be operated in parallel with a specifically set power distribution, adjusted in stages if necessary.

In this way, for example, a conventional sand filling in the lower area of the tapping channel directly above the sealing level of the pouring device is not necessary. The approach, which would otherwise be difficult to heat up, can be heated inductively using the second inductor, independently of the rest of the area of the pouring body. This allows the result to be achieved with a liquid over the entire height.

23.08.00

D 16 F 11/00

KEIL& SCHAAF HAUSEN

PATENT ATTORNEYS

or by heating, the melt column in the tapping channel can be reliably reached. The opening of the tapping channel is always guaranteed, regardless of the use of the closure system.
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The attachment of the pouring body can extend, if necessary with the interposition of a plastic sealing compound, to a closure device arranged downstream of the pouring body, e.g. the fixed closure plate of a slide closure or a closure plug.

If the additional inductor has an external magnetic shield, it is ensured that stray fields in the external space around the additional inductor are very weak and therefore do not excessively heat up neighboring metal structures, such as the closure device. Preferably, one and/or the additional inductor is designed as an inductor coil, which may be medium-cooled, preferably air-cooled, and which surrounds the pouring body in its respective areas.

To support the spout body, it can have an external conical extension on the outlet side above the self-supporting attachment, with which it rests on a conical 5 support surface of the metal base wall, possibly with an interposed layer of thermal insulation. This enables simple centering assembly. The thermal insulation provided prevents undesirable heat loss.

For the same reason, the closure device, in particular the slide closure, can also be provided with thermal insulation.

Further objects, features, advantages and possible applications of the invention will become apparent from the following description of embodiments based on the drawing.

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- 4 - KEIL&SCHAAFHAUSEN

PATENT ATTORNEYS

all described and/or illustrated features, alone or in any combination, constitute the subject matter of the invention, regardless of their summary in individual claims or their reference back to one another.

The single figure illustrates schematically in section a pouring device embodying the invention.

The pouring device shown is shown in the bottom area of a melting vessel, which is formed by an outer metal bottom wall 5 and a bottom structure 7 made of refractory material supported by the latter. A tubular pouring body 2 forming a tapping channel 1 is integrated into the bottom structure 7. The pouring body 2 has a self-supporting attachment or extension 6 on its outlet end 4 that protrudes beyond the metal bottom wall 5. In a pouring body section 8 located within the bottom structure 7, the pouring body 2 can be coupled to a first inductor 3 for heating. The attachment 6 of the pouring body 2 protruding from the metal bottom wall 5 is assigned a further inductor or inductor section 9, which can be operated independently of the first inductor 3, i.e. can be cooled, among other things, but its energy output can also be controlled or regulated. In this way, the attachment 6 can be heated independently of the inner spout body section 8.

As can be seen from the figure, the extension 6 of the pouring body 2 extends, with the interposition of a plastic sealing compound 10, to a fixed closure plate 11 of a closure device 17 arranged downstream of the pouring body 2, possibly designed as a slide closure. The further inductor 9 is provided with an external magnetic shield in order to avoid stray fields. Both the inductor 3

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_ 5 - KEIL&SCHAAFHAUSEN

PATENT ATTORNEYS

as well as the inductor 9 can be designed as a coil and can be flowed through by a cooling medium, e.g. air.

The pouring body 2 has an outer conical extension 13 on the outlet side above the self-supporting extension 6, with which it rests on a conical holding surface 15 of the metal base wall 5 with the interposition of a thermal insulation 14. In this way, a secure, centered assembly of the pouring body 2 is possible. The thermal insulation 14 ensures that not too much heat flows into the metal base wall 5. For this reason, the closure device 17 is also equipped with a thermal insulation 16.

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D 16 F 11/00 ·**··**·

- 6 - Keil&Schaafhausen

PATENT ATTORNEYS

List of reference symbols:

1 tapping channel

2 spout bodies

3 Inductor

4 Expiring

5 metal bottom wall 6 attachment or extension

7 Floor construction

8 inner spout body section

9 additional inductor or inductor section 10 sealing compound

11 fixed locking plate

12 magnetic shielding

13 Expansion

14 Thermal insulation

15 conical holding surface 0 16 thermal insulation

17 Closure device, in particular slide closure

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Claims (6)

1. Pouring device of a vessel for receiving melt, in particular molten metal, e.g. of an arc electric furnace with a e.g. sleeve-shaped or tubular pouring device forming a tapping channel ( 1 ), e.g. B. Monolithic pouring body ( 2 ) made of a refractory material which can be coupled to an inductor ( 3 ) for heating at least in some areas and which projects with its lower outlet end ( 4 ) beyond the metal bottom wall ( 5 ) of the melting vessel and can also be coupled there inductively, characterized in that the shoulder or extension ( 6 ) of the pouring body ( 2 ) which projects beyond the metal bottom wall ( 5 ) is assigned a further inductor or inductor section ( 9 ) which can be operated independently of the inductor ( 3 ) assigned to the pouring body section ( 8 ) located within the bottom structure ( 7 ) of the melting vessel, in particular which can be controlled or regulated. 2. Pouring device according to claim 1, characterized in that the projection ( 6 ) of the pouring body ( 2 ), optionally with the interposition of a plastic sealing compound ( 10 ), extends to a closure device arranged downstream of the pouring body ( 2 ), e.g. the fixed slide plate ( 11 ) of a slide closure. 3. Pouring device according to claim 1 or 2, characterized in that the further inductor ( 9 ) has an external magnetic shield ( 12 ). 4. Pouring device according to one of claims 1 to 3, characterized in that the one and/or the further inductor ( 3 , 9 ) is designed as an optionally medium-cooled, preferably air-cooled inductor coil. 5. Pouring device according to one of the preceding claims, characterized in that the pouring body ( 2 ) has an outlet-side outer conical extension ( 13 ) with which it is supported on a conical holding surface ( 15 ) of the metal bottom wall ( 5 ), optionally with the interposition of a thermal insulation ( 14 ). 6. Pouring device according to one of the preceding claims, characterized in that the closure device ( 17 ), in particular the sliding closure, is assigned a thermal insulation ( 16 ).