JPH07111901B2 - Electromagnetic induction heating device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electromagnetic induction heating apparatus, and more particularly to an apparatus for electromagnetically heating a thin metal plate.

[Prior Art] Conventionally, an electromagnetic induction heating device for heating a strip by generating a magnetic flux in a direction perpendicular to a thin metal plate (hereinafter referred to as a strip) and inducing an eddy current in the strip by changing the magnetic flux. It has been known.

Conventionally, in an electromagnetic induction heating device, a strip is stretched between guide rolls installed on the inlet side and the outlet side of the electromagnetic induction heating device, passes through the inside of the electromagnetic induction heating device, and is heated by electromagnetic induction.

[Problems to be Solved by the Invention] In the case of the conventional electromagnetic induction heating apparatus, it is possible to efficiently heat the strip by reducing the gap (gap) between the strip and the magnetic pole as much as possible. Although it is designed to reduce the gap by arranging it, if the gap is small, the strip vibrations and magnetic attraction that the strip receives will cause rubbing between the magnetic poles and damage to the strip, which will deteriorate the quality. Due to the close relationship between the two, it was necessary to create a gap of at least a certain amount.

[Means for Solving the Problems] According to the present invention, a roll formed of a heat insulating insulator, provided with a magnetic body inside, for supporting and guiding a thin metal plate in a predetermined direction, and a roll facing the roll. And an electromagnet having a plurality of magnetic pole pieces arranged in the sheet width direction of the thin metal plate, the magnetic pole pieces having a magnetic pole body movable in the roll direction. .

[Examples] Hereinafter, the present invention will be described with reference to Examples.

Referring to FIGS. 1A and 1B, a columnar iron core (laminated silicon steel plate or ferrite) 2 is supported on a support shaft 1, and an air bearing is provided on the circumferential surface of the iron core 2. A heat insulating insulator 4 such as ceramic or high heat resistant rubber is disposed via 3 to form a guide roll 5, and a strip (metal thin plate) 6 is supported and guided by the guide roll 5. An electromagnet 7 is disposed so as to face the guide roll 5, and the electromagnet 7 includes a yoke 8, a magnetic pole body 9 attached to both ends of the yoke 8, and an exciting coil wound around the yoke 8. It has 10 and. The magnetic pole body 9 is divided into a plurality of magnetic pole pieces 9a in the strip width direction of the strip 6, and is movable with respect to the guide roll 5 as shown in FIG. 1 (b). That is,
Each magnetic plate piece 9a is movable in the guide roll direction. A shield plate 11 is arranged between the magnetic pole body 9 and the guide roll 5, and the shield plate 11 has a mechanism capable of advancing and retreating in correspondence with the number of the protruding magnetic pole bodies 9.

When the strip 6 is heated by electromagnetic induction, a high-frequency current is passed through the exciting coil 10 to magnetize the pair of magnetic pole bodies 9 so that different magnetic poles are formed. The strip 6, which is supported and guided by the guide roll 5 and advances in the direction of the solid arrow, is electromagnetically heated by the electromagnet 7 as described later.

A magnetic field line from one magnetic pole body (N pole) 9 vertically penetrates the strip 6 through the window of the shield plate 11, passes through the iron core 2 of the guide roll 5, and again penetrates the strip 6.
A high-frequency magnetic field is formed in the other magnetic pole body (S pole) 9, and an eddy current is induced in the strip 6 by this high-frequency magnetic field to heat the strip 6. Unnecessary magnetic lines of force are cut by the shield plate 11. That is, the unnecessary leakage magnetic flux is reduced by the shield plate 11.

Further, in order to realize a uniform heating temperature distribution in the strip width direction of the strip 6, the magnetic pole body 9 and the shield plate 11 are adjusted. That is, each magnetic pole piece 9a is moved in the guide roll direction to adjust the magnetic field distribution, and the shield plate 11 is moved in the plate width direction to adjust the magnetic flux penetrating the strip 6.

[Effects of the Invention] As described above, in the electromagnetic induction heating device of the present invention,
In the electromagnetic induction heating device, since the strip is supported and guided by the guide rolls, the strip, in relation to the magnetic pole, has a very small gap between the magnetic pole and the strip when the strip is constrained in place. The heating operation can be performed in close proximity, and the induction heating efficiency can be greatly improved.

[Brief description of drawings]

1 (a) is a side view of an embodiment of the electromagnetic induction heating apparatus according to the present invention, and FIG. 1 (b) is a top view of the embodiment of the electromagnetic induction heating apparatus according to the present invention. . 1 ... Support shaft, 2 ... Iron core, 3 ... Air bearing, 4 ... Insulating insulator, 5 ... Guide roll, 6 ... Strip, 7 ... Electromagnet, 8 ... Yoke, 9 ... Magnetic pole body, 10 ... … Excitation coil, 11 …… Shield plate

Claims (1)

[Claims] 1. A roll formed of a heat insulating insulator, having a magnetic body inside, for supporting and guiding a thin metal plate in a predetermined direction, and a roll arranged so as to face the roll, in the plate width direction of the thin metal plate. And an electromagnet having a magnetic pole piece that is divided into a plurality of magnetic pole pieces, the magnetic pole piece being movable in the roll direction.