Tapping device and method using induction heat for melt

Abstract

A tapping device and method using induction heat for melt comprises melting furnace made of steel; heating unit disposed in the upper part in the melting furnace and made of graphite material; induction coil wound around the heating unit; insulator disposed adjacent to the bottom surface of the lower part of the melting furnace; supporter disposed outside the insulator; and firebricks disposed on the bottom surface of melting furnace and outside the supporter.

Claims

1. A tapping device for melt using induction heat, comprising: a melting furnace(10) made of steel material; firebricks(20) disposed on a bottom surface of the melting furnace(10), the firebricks(20) including a lower surface in contact with the bottom surface of the melting furnace(10) and an upper surface opposite to the lower surface; a heating unit(12) disposed in the melting furnace(10) and made of graphite material, wherein an upper end of the heating unit(12) is disposed above a level at which the upper surface of the firebricks(20) is disposed; an induction coil(14) wound around the heating unit(12); an insulator(16) disposed adjacent to the bottom surface of the melting furnace(10); and a supporter(18) disposed outside the insulator(16), wherein the firebricks(20) are disposed outside the supporter(18), wherein the firebricks(20) include two opposite side surfaces which are apart from each other by a gap; and the induction coil(14) is disposed in the gap to face the two opposite side surfaces.

2. The tapping device of claim 1, wherein the surface of the heating unit(12) is coated with molybdenum(MoSi.sub.2).

3. The tapping device of claim 2, wherein coolant flow channel(24) is formed to make coolant flow under insulator(16) for temperature control of the heating unit(12) and cooling down while tapping is halted.

4. The tapping device of claim 1, wherein the surface of the heating unit(12) is coated with silicon carbide(SiC).

5. The tapping device of claim 4, wherein coolant flow channel(24) is formed to make coolant flow under insulator(16) for temperature control of the heating unit(12) and cooling down while tapping is halted.

6. The tapping device of claim 1, wherein melt tapping hole(22) is formed in the upper part of induction coil(14) and firebricks(20), and the melt tapping hole(22) is made of alumina refractories.

7. The tapping device of claim 1, wherein the insulator(16) is formed of core of ferrite material.

8. The tapping device of claim 1, wherein coolant flow channel(24) is formed to make coolant flow under insulator(16) for temperature control of the heating unit(12) and cooling down while tapping is halted.

9. A tapping method for melt using induction heat, wherein the method comprises steps of melting solidified melt inside a melt tapping hole(22) and discharging the melt downwards by gravity using a tapping device(A), wherein the tapping device(A) comprises: a melting furnace(10) made of steel material; firebricks(20) disposed on a bottom surface of the melting furnace(10), the firebricks(20) including a lower surface in contact with the bottom surface of the melting furnace(10) and an upper surface opposite to the lower surface; a heating unit(12) disposed in the melting furnace(10) and made of graphite material, wherein an upper end of the heating unit(12) is disposed above a level at which the upper surface of the firebricks(20) is disposed; an induction coil(14) wound around the heating unit(12); an insulator(16) disposed adjacent to the bottom surface of the melting furnace(10); and a supporter(18) disposed outside the insulator(16), wherein the firebricks(20) are disposed outside the supporter(18), wherein the firebricks(20) include two opposite side surfaces which are apart from each other by a gap; and the induction coil(14) is disposed in the gap to face the two opposite side surfaces.

10. The tapping method of claim 9, wherein the surface of the heating unit(12) is coated with molybdenum(MoSi.sub.2).

11. The tapping method of claim 10, wherein coolant flow channel(24) is formed to make coolant flow under insulator(16) for temperature control of the heating unit(12) and cooling down while tapping is halted.

12. The tapping method of claim 9, wherein the surface of the heating unit(12) is coated with silicon carbide(SiC).

13. The tapping method of claim 12, wherein coolant flow channel(24) is formed to make coolant flow under insulator(16) for temperature control of the heating unit(12) and cooling down while tapping is halted.

14. The tapping method of claim 9, wherein melt tapping hole(22) is formed in the upper part of induction coil(14) and firebricks(20), and the melt tapping hole(22) is made of alumina refractories.

15. The tapping method of claim 9, wherein the insulator(16) is formed of core of ferrite material.

16. The tapping method of claim 9, wherein coolant flow channel(24) is formed to make coolant flow under insulator(16) for temperature control of the heating unit(12) and cooling down while tapping is halted.

Description

DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a schematic diagram showing induction tapping equipment for melt according to the present invention;

(2) FIG. 2 is a conceptual diagram showing a state that induction tapping equipment for melt according to the present invention is installed in melting furnace.

DESCRIPTION OF THE REFERENCE NUMERALS IN THE DRAWINGS

(3) 10: melting furnace

(4) 12: heating unit

(5) 14: induction coil

(6) 16: insulator

(7) 18: supporter

(8) 20: firebricks

(9) 22: melt tapping hole

(10) 24: coolant flow channel

(11) A: induction tapping equipment for melt

BEST MODE

(12) Specific features and advantages of the present invention will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings.

(13) FIG. 1 is a schematic diagram showing induction tapping equipment for melt according to the present invention, and FIG. 2 is a conceptual diagram showing a state that induction tapping equipment for melt according to the present invention is installed in melting furnace.

(14) As shown in these figures, induction tapping equipment for melt according to the present invention comprises melting furnace (10) made of steel material; heating unit (12) disposed in the upper part in the melting furnace and made of graphite material; induction coil (14) wound around the heating unit (12); insulator (16) disposed adjacent to the bottom surface of the lower part of the melting furnace (10); supporter disposed outside the insulator (16); firebricks disposed on the bottom surface of melting furnace and outside the supporter (20).

(15) Thus, induction tapping equipment(A) according to the present invention is an equipment comprising melting furnace (10), heating unit (12), induction coil (14), insulator (16), supporter (18), firebricks (20), and melt tapping hole (22), which are organically combined together.

(16) Here, the melting furnace (10) is formed of steel material.

(17) Further, the heating unit (12) is formed of high density graphite material, and the surface of graphite is coated with molybdenum (MoSi.sub.2) or silicon carbide (SiC).

(18) In particular, the upper part of the heating unit (12) is disposed to be higher than the bottom of melting furnace (10) so that heat can be transferred to melt directly, and in order to align the form of dam and maintain high temperature of melt in the lower part of the melting furnace (10), tapping is performed while being heated. And, the induction coil (14) is wound around the heating unit (12).

(19) And the insulator (16) is disposed adjacent to the bottom surface of the lower part of the melting furnace. And the supporter (18) is disposed outside the insulator (16).

(20) And the firebricks (20) is disposed outside the supporter (18) and on the bottom surface of melting furnace (10).

(21) And melt tapping hole (22), outlet for melt, is formed between the upper part of induction coil(14) and firebricks(20), and the melt tapping hole (22) is formed of alumina refractories, and core of ferrite material as insulator (16) is attached outside induction coil (14) to block heat transference to the metal in lower part of melting furnace (10), and the outside of the melt tapping hole (22) is configured to be supported by supporter (18) made of metal.

(22) And the melt tapping hole (22) is heated by attaching high-frequency induction coil (14) to heating unit (12) made of graphite material, and the melt tapping hole (22) is heated to transfer heat to melt the solidified melt inside tapping hole and to discharge melted molten melt downwards by gravity.

(23) Here, the melt tapping hole (22) is disposed in the lower part of melting furnace (10), and the melt tapping hole (22) is installed higher than the bottom of melting furnace (10) to structurally prevent melt from being discharged completely.

(24) The reason for this is to increase thermal efficiency and melting speed and prevent electrode disposed on the bottom of melting furnace (10) from being exposed to plasma of high temperature and easily consumed by maintaining fixed quantity of molten metal all the time.

(25) Meanwhile, coolant flow channel (24) is formed to make coolant flow under insulator (16) for temperature control of the heating unit (12) and cooling down while tapping is halted.

(26) Hereinafter, the operation of induction tapping equipment for melt with composition as described above is explained in detail.

(27) As shown in FIG. 1 and FIG. 2, according to the present invention induction tapping method for melt is to melt solidified melt inside melt tapping hole (22) and discharge downwards by gravity using induction tapping equipment(A) of melting furnace comprising melting furnace (10) made of steel; heating unit (12) disposed in the upper part in the melting furnace (10) and made of graphite material; induction coil (14)wound around the heating unit (12); insulator (16) disposed adjacent to the bottom surface of the lower part of the melting furnace (16); supporter (18) disposed outside the insulator; and firebricks (20) disposed outside the supporter (18) and on the bottom surface of melting furnace (10).

(28) In addition, the upper part of the heating unit (12) is disposed to be higher than the bottom of melting furnace (10) so that heat can be transferred to melt directly and in order to align the form of dam and maintain high temperature of melt in the lower part of the melting furnace (10), tapping is performed while being heated.

(29) Induction tapping method for melt according to the present invention with composition as described above is to discharge melt partially by disposing melt tapping hole (22) in the lower part of melting furnace (10) and installing the tapping hole (22) higher than the bottom of melting furnace (10). Thus it has effective action that a fixed quantity of molten metal is maintained to increase thermal efficiency and melting speed and prevent electrode disposed on the bottom of melting furnace from being exposed to plasma of high temperature and easily consumed.