Induction Heating Device for a Metal Plate

• US 20080264932A1
• Filed: 02/09/2006
• Published: 10/30/2008
• Est. Priority Date: 02/18/2005
• Status: Active Grant

• Current Assignee: Nippon Steel Corporation
• Original Assignee: Nippon Steel Corporation
• Inventors: Hirota, Yoshiaki
• Granted Patent: US 8,536,498 B2
• Time in Patent Office: Days
• US Class Current: 219/672
• CPC Class Codes: H05B 6/104 metal pieces being elongated like wires or bands
• CPC Class Codes: H05B 6/365 using supplementary conductive or ferromagnetic pieces
• CPC Class Codes: Y02P 10/25 Process efficiency

Abstract

An induction heating apparatus for heating a traveling metal plate includes an induction coil for surrounding the metal plate. The induction coil includes an upper induction coil for being located above the metal plate and a lower induction coil for being located below the metal plate. The upper and lower induction coils are spaced from each other in a longitudinal direction of the metal plate a constant distance across a transverse direction of the metal plate. Each of the upper induction coil and the lower induction coil is arranged obliquely at an edge area of the metal plate so as to form an oblique angle with the transverse direction of the metal plate.

Claims

1. An induction heating apparatus for heating a traveling metal plate, comprising:

an induction coil for surrounding the metal plate, said induction coil including an upper induction coil for being located above the metal plate and a lower induction coil for being located below the metal plate, said upper and lower induction coils being spaced from each other in a longitudinal direction of the metal plate a constant distance across a transverse direction of the metal plate,

wherein each of the upper induction coil and the lower induction coil is arranged obliquely at an edge area of the metal plate so as to form an oblique angle with the transverse direction of the metal plate.

2. The induction heating apparatus according to claim 1, wherein the distance between the upper induction coil and the lower induction coil is 0.2 to 6 times the width of a wider of the upper and lower induction coils.

3. The induction heating apparatus according to claim 2, wherein the oblique angle ranges from 10 degrees to 60 degrees.

4. The induction heating apparatus according to claim 3, wherein the distance between the upper induction coil and the lower induction coil is adjustable.

5. The induction heating apparatus according to claim 4, wherein at least one of the upper induction coil and the lower induction coil is movable in the longitudinal direction of the metal plate.

6. The induction heating apparatus according to claim 4, wherein at least one of the upper induction coil and the lower induction coil is constructed of a plurality of conductors so that the distance between the upper induction coil and the lower induction coil can be adjusted by selecting a specific conductor among the plurality of conductors as the conductor to be energized by alternating current.

7. The induction heating apparatus according to claim 5, further comprising a guide rail that extends along the metal plate in the longitudinal direction, at least one of the upper induction coil and the lower induction coil being movably mounted on the guide rail.

8. The induction heating apparatus according to claim 3, wherein a width of at least one of the upper induction coil and the lower induction coil is changeable.

9. The induction heating apparatus according to claim 8, wherein at least one of the upper induction coil and the lower induction coil is constructed of a plurality of conductors and the width of at least one of the upper induction coil and the lower induction coil can be changed by selecting one or more specific conductors among the plurality of conductors as the conductors to be energized by alternating current.

10. The induction heating apparatus according to claim 1, said induction coil further comprising an edge induction coil connecting between said upper and lower induction coils, said edge induction coil for being located at an edge of the metal plate.

11. An induction heating apparatus for heating a traveling metal plate, comprising:

an AC power supply;

an upper induction coil for being located above the metal plate, said upper induction coil being connected at one end thereof to the AC power supply; and

a lower induction coil for being located below the metal plate, said lower induction coil being connected at one end thereof to the AC power supply, said lower induction coil being spaced from said upper induction coil in a longitudinal direction of the metal plate a constant distance across a transverse direction of the metal plate,

wherein each of the upper induction coil and the lower induction coil includes at least one oblique portion at an edge area of the metal plate, said at least one oblique portion forming an oblique angle with the transverse direction of the metal plate.

12. The induction heating apparatus according to claim 11, wherein the distance between the upper induction coil and the lower induction coil is 0.2 to 6 times the width of a wider of the upper and lower induction coils.

13. The induction heating apparatus according to claim 12, wherein the oblique angle ranges from 10 degrees to 60 degrees.

14. The induction heating apparatus according to claim 13, wherein the distance between the upper induction coil and the lower induction coil is adjustable.

15. The induction heating apparatus according to claim 14, wherein at least one of the upper induction coil and the lower induction coil is movable in the longitudinal direction of the metal plate.

16. The induction heating apparatus according to claim 14, wherein at least one of the upper induction coil and the lower induction coil is constructed of a plurality of conductors so that the distance between the upper induction coil and the lower induction coil can be adjusted by selecting a specific conductor among the plurality of conductors as the one to be energized by alternating current of the AC power source.

17. The induction heating apparatus according to claim 15, further comprising a guide rail that extends along the metal plate in the longitudinal direction, at least one of the upper induction coil and the lower induction coil being movably mounted on the guide rail.

18. The induction heating apparatus according to claim 13, wherein a width of at least one of the upper induction coil and the lower induction coil is changeable.

19. The induction heating apparatus according to claim 18, wherein at least one of the upper induction coil and the lower induction coil is constructed of a plurality of conductors and the width of at least one of the upper induction coil and the lower induction coil can be changed by selecting one or more specific conductors among the plurality of conductors as the conductors to be energized by alternating current of the AC power source.

20. The induction heating apparatus according to claim 11, said induction coil further comprising an edge portion connecting between said upper and lower portions of the induction coil at ends of the upper and lower portions of the induction coil opposite to the AC power source, said edge portion for being located at an edge of the metal plate.