JPH05182754A - Electromagnetic induction heating device - Google Patents

Abstract

PURPOSE:To provide an electromagnetic induction heating device which can prevent the power source for plural electromagnetic heating means from genatrating a defective oscillation or an oscillation failure, and can prevent unevenness of the heating temperature distribution of a thin plate. CONSTITUTION:To oppose to a thin plate 1 moved in the preset direction, plural electromagnetic induction heating mechanisms 2 and 3 are provided at a specified interval in the moving direction of the above thin plate 1. Furthermore, magnetic substance blocks 4 and 5 are arranged between the electromagnetic induction heating mechanisms 2 and 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic induction heating device for heating a thin plate by electromagnetic induction.

[0002]

2. Description of the Related Art Conventionally, as this type of electromagnetic induction heating device, a plurality of electromagnetic induction heating means are arranged at predetermined intervals in the moving direction of the thin plate so as to face the thin plate which is moved in a predetermined direction. What is done is known.

[0003]

However, in the conventional electromagnetic induction heating device, when the distance between the plurality of electromagnetic induction heating means in the moving direction of the thin plate becomes a predetermined value or less, the magnetic field generated by the plurality of electromagnetic induction heating means is reduced. However, there is a problem that the power sources of the plurality of electromagnetic induction heating means fail to oscillate or cannot oscillate, and the heating temperature distribution of the thin plate is disturbed.

An object of the present invention is to prevent the power sources of a plurality of electromagnetic induction heating means from oscillating or failing to oscillate, and prevent the heating temperature distribution of the thin plate from being disturbed. To provide.

[0005]

According to the present invention, a plurality of electromagnetic induction heating means are arranged at predetermined intervals in the moving direction of the thin plate so as to face the thin plate which is moved in a predetermined direction. In the electromagnetic induction heating apparatus, the magnetic induction block is obtained by disposing a magnetic block between the plurality of electromagnetic induction heating means.

Further, according to the present invention, in the electromagnetic induction heating device, the electromagnetic induction heating means includes a plurality of magnetic pole segments arranged in parallel with each other in a width direction of the thin plate, and a moving direction of the thin plate on the magnetic pole segment. There is provided an electromagnetic induction heating device comprising: a plurality of coils wound in parallel along a plurality of coils; and a power supply means for supplying a current to the plurality of coils.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a thin plate such as a hot strip. This thin plate 1 is transferred at a constant speed in the direction of arrow A by a transfer mechanism (not shown). Electromagnetic induction heating mechanisms 2, 2, 3, 3 are arranged on both sides of the movement path of the thin plate 1 so as to face the thin plate 1.
The electromagnetic induction heating mechanisms 2 and 3 are arranged at a predetermined interval in the moving direction of the thin plate 1. The electromagnetic induction heating mechanism 2 includes a plurality of magnetic pole segments 21 and 21 arranged in parallel in the width direction of the thin plate 1, and the magnetic pole segments 21,
21 includes a plurality of coils a _{1 to} a ₄ and b _{1 to} b ₄ wound in parallel along the moving direction of the thin plate 1.

As shown in FIG. 2, the plurality of coils a ₁ to
a ₄ is connected in series and has a plurality of coils b _{1 to} b ₄
Are also connected in series. The series connection body of these coils a _{1 to} a _{4 and} the series connection body of the coils b _{1 to} b ₄ are connected in series.

A secondary coil T ₂ of the transformer T and a variable capacitor C are connected in parallel between the coil a ₁ and the coil b _1, and a switch 22 is connected to the primary coil T ₁ of the transformer T. The AC power supply 23 is connected via. When the switch 22 is closed, the AC current from the AC power supply 23 is supplied to the coils a ₁ and a ₂ and the coils b ₁ and b ₂ through the transformer T. Then, currents of opposite polarities are applied to the adjacent coils a _{1 to} a ₄ and b _{1 to} b ₄ described above. The electromagnetic induction heating mechanism 3 has the same structure as the electromagnetic induction heating mechanism 2.

As shown in FIGS. 1 and 3, magnetic material blocks 4 and 5 are arranged between the electromagnetic induction heating mechanism 2 and the electromagnetic induction heating mechanism 3. The magnetic blocks 4 and 5 are formed with holes through which the thin plate 1 passes. The magnetic blocks 4 and 5 are formed of, for example, laminated silicon steel plates. The magnetic blocks 4 and 5 prevent the magnetic fields generated in the electromagnetic induction heating mechanisms 2 and 3 from interfering with each other by blocking the leakage of magnetic flux from the electromagnetic induction heating mechanisms. The electromagnetic induction heating mechanism 2
It is better to set L <3G, where G is the distance between the magnetic induction blocks 2 and 3 and L is the distance between the electromagnetic induction heating mechanisms 2 and 3 and the thickness of the magnetic blocks 4 and 5 is H. Also, it is better to set H <G / 2. The magnetic material blocks 4 and 5 may be arranged so as to face each other as shown in FIG.

[0012]

According to the electromagnetic induction heating apparatus of the present invention, the magnetic fields generated in the adjacent electromagnetic induction heating means are prevented from interfering with each other, so that the power supplies of the plurality of electromagnetic induction heating means are oscillated or cannot oscillate. Since it is possible to prevent the heating temperature distribution of the thin plate from being disturbed,
The electromagnetic induction heating means can be arranged close to each other, and the size can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an electric circuit diagram showing a circuit for supplying power to the coil of the embodiment of FIG.

FIG. 3 is a cross-sectional view showing a main part of one embodiment of FIG.

FIG. 4 is a sectional view showing a main part of another embodiment of the present invention by cutting it.

[Explanation of symbols]

1 sheet 2,3 electromagnetic induction heating device _{a 1 ~a 4, b 1 ~b} 4 coils 4,5 magnetic block 23 AC power source

Claims (2)

[Claims] 1. An electromagnetic induction heating apparatus in which a plurality of electromagnetic induction heating means are arranged at predetermined intervals in the moving direction of the thin plate so as to face the thin plate that is moved in a predetermined direction. 2. An electromagnetic induction heating device, characterized in that a magnetic block is arranged between the electromagnetic induction heating means. 2. The electromagnetic induction heating device according to claim 1, wherein the electromagnetic induction heating means includes a plurality of magnetic pole segments arranged in parallel with each other in a width direction of the thin plate, and the magnetic pole segment in a moving direction of the thin plate. An electromagnetic induction heating apparatus, comprising: a plurality of coils wound in parallel along a plurality of coils; and a power feeding means for supplying a current to the plurality of coils.