JPH03291891A - Crossing magnetic flux type induction heating device - Google Patents

Abstract

PURPOSE:To regulate the heating range in a simple structure by opposingly disposing two inductors made by winding coils in the recessed grooves of iron cores, dividing the iron cores into plural numbers along the conveying direction of the material to heat, and connecting coils in parallel along the dividing surfaces. CONSTITUTION:Iron cores 7a to 7c made by laminating silicon steel plates are divided into three along the conveying direction of a thin plate 3. Recessed grooves 10 are formed on the iron cores 7a to 7c at their thin plate side, and coils 5 are wound on them. The coils 5 form a grid-form of circuit by the main coil 5a, and parallel coils 5b and 5c. The coils 5 are water-cooling coils, and an electric terminal 11 is installed to the main coil 5a, while tap converters 12a to 12c are installed to the coils 5a to 5c. Inductors 17 made by such a way are disposed oppositely at the upper side and the lower side, the current is fed to the terminals 11, and a magnetic flux is passed to the thin plate 3 carried in, to heat it inductively. When the thin plate 3 is wide, the current is fed while the contacts of the converters 12b and 12c are turned off and the converter 12a of the main coil is turned on, and the magnetic flux is generated from the whole body of iron cores 7a to 7c to heat the thin plate 3 evenly.

Description

[Detailed Description of the Invention] [Objective of the Invention 1 (Field of Industrial Application) The present invention provides a transverse magnetic flux type induction heating device with an improved mechanism for adjusting the heating range according to the width of the thin plate. .

(Prior art) Generally, when annealing a thin metal plate or drying the surface paint of a painted thin metal plate, etc., two inductors each having a coil wound around an iron core are placed facing each other, and an illumination
A transverse magnetic flux type (transverse type) induction heating device is used, in which magnetic flux is passed through a thin plate by both inductors to induce induction heating.

When heating a thin plate using this transverse magnetic flux type induction heating device, it is necessary to heat the thin plate so that the magnetic flux passing through the plate becomes uniform as the width of the plate changes.

Conventionally, there are two types of devices that change the heating range according to changes in plate width: a magnetic pole elevating type and a magnetic pole rotating type.

As shown in FIG. 6, the magnetic pole elevating type has a plurality of plate-shaped magnetic pole segments 2 closely arranged inside the support frame 1 along the width direction of the plate, and is moved in and out by a drive rod 4. freely supported. In this induction heating device, a coil 5 is wound around the lower part of this 1ii1i segment 2, and a movable shielding plate 6 is movably provided between the lower thin plate 3 and the thin plate 3 in parallel with the thin plate 3. According to the width of the thin plate 3, the magnetic pole segment 2 on the end side is raised by the drive ring 4, the coil 5 is also pulled out, and the movable shielding plate 6 is pulled out below the pulled out part to shield the magnetic flux. The heating range is adjusted according to the width.

However, with this structure, the mechanism for raising and lowering each magnetic pole segment 2 and the movable mechanism for the movable shielding plate 6 are complicated, making the device larger, and the coil 5, which shields the magnetic field, is also constantly energized, resulting in poor efficiency. There is.

In addition, the magnetic pole rotating type has a thin plate 3 as shown in Figure 7.
An iron core 7 is provided along the plate width direction, and a coil 5 is placed around the outer periphery of the iron core 7.
A plurality of rod-shaped magnetic poles 8 are arranged at intervals along the conveyance direction of the thin plate 3, and each magnetic pole 8 is rotatably supported by a rotating shaft 9 at its center and connected to a connecting member (not shown). They are connected and interlocked.

In this structure, each magnetic pole 8,
The heating range is adjusted by rotating them around the rotation axis 9 as shown by the imaginary line and aligning them diagonally.

However, since this device also has a rotational drive mechanism for the magnetic pole 8, the structure is complicated and the device also has the drawback of being large-sized.

(Problems to be Solved by the Invention) An object of the present invention is to eliminate the above-mentioned drawbacks and provide a transverse magnetic flux type induction heating device that has an extremely simple structure and can easily adjust the heating range according to the width of the thin plate. That is.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a groove in which a groove is formed in an iron core, in which an inductor with a coil wound thereon is disposed facing each other, and a covered groove is formed between the two inductors. In a transverse magnetic flux type induction heating device that inductively heats a material to be heated by continuously conveying it, the iron core is divided into a plurality of pieces along the conveyance direction of the material to be heated, and the coils are connected in parallel along the dividing plane. The present invention is characterized in that a lattice-shaped circuit is formed, and a tap changer is provided with a contact on each of the crossover conductors along the dividing plane of the circuit.

(Function) To explain the function of the present invention, two inductors are arranged facing each other, and a transverse magnetic flux is passed through a thin plate conveyed between the two inductors to perform induction heating.

When changing the width of the thin plate to be heated, the current circuit flowing through the grid circuit is changed by opening and closing the contacts of the tap changer attached to the crossover conductor of the coil along the core dividing plane. It is possible to generate magnetic flux from the iron core within a range and uniformly inductively heat the entire board width.

(Examples) Hereinafter, the present invention will be described in detail with reference to examples shown in the drawings.

1 to 3 show an embodiment of the present invention. In the figures, 78.7b and 7c are iron cores made of laminated silicon steel plates, which are divided into 3 m sections along the conveying direction of the thin plate 3, and are divided into 3 m sections on the right side in the figure. The wide core 7a and the central and left cores 7b and 7c
It is made up of.

A groove lO is formed on the thin plate 3 side of each of the iron cores 7a, 7b, and 7c, and the coil 5 is fitted into and wound therein.

This coil 5 has a grid-like circuit formed by a main coil 5a having a rectangular frame shape and parallel coils 5b and 5c connected in parallel along the core dividing plane.

The coil 5 is formed of a water-cooled coil, and a feeding terminal 11.11 is attached to the main coil 5a on the right side in the figure of the iron core 7a along the iron core dividing plane, and further on the left end side of the iron core 7c. A tap changer 12 is installed in the middle part of the main coil 5a and the middle part of the parallel coils 5b and 5c on the split plane.
a, 12b, and 12c are attached.

These tap changers 12a, 12b, and 12c, for example, as shown in FIG.
The upper part of 3.13 is connected to the drain port 14 of the cooling water 18, and fixed contacts 15a, 15a are attached.

Furthermore, an air cylinder 1 is placed above the fixed contact 15a.
A plate-shaped movable contact 15b attached to the coil 6 is provided to electrically open and close the parallel coil 5b. Note that the water passage circuit for the cooling water 18 flowing through the filter 5 is a separate circuit from the coil circuit.

For example, two inductors 17 having the above configuration are arranged vertically facing each other as shown in FIG. The thin plate 3 conveyed between the two inductors 17, 17 is heated by induction by passing a transverse magnetic flux in the vertical direction.

In this case, when the width of the thin plate 3 to be heated is wide, tap changers 12b provided in parallel coils 5b and 5C on the core dividing surface,
When the contact 12c is turned off and the contact of the tap changer 12a provided on the main coil 5a is turned on to lengthen the coil length, magnetic flux is generated from the entire three cores 7a, 7b, and 7c, and the thin plate 3 is heated evenly.

Further, if the width of the thin plate 3 is narrow as shown in FIG. 2, by turning off the contacts of the tap changers 12a and 12b and turning on only the tap changer 12c, the iron core 7a,
Magnetic flux can be generated from 7b.

In the above embodiment, the case of a single coil was shown, but in the case of a twin coil, for example, the circuit configuration is shown in Section 4.

FIG. 5 shows another embodiment of the present invention, in which a wide core 7a is provided in the center, and narrow cores 7b and 7c are provided on both sides.
It has a three-division structure.

The coil 5 has a main coil 5a and parallel coils 5b and 5c arranged in parallel along the core dividing plane to form a lattice-like circuit, and tap changers 12a to 12 are provided in the middle of the coil portions parallel to the dividing plane. 12d is attached.

In this structure, the circuit of the central iron core 7a is always energized, and the tap changers 12a to 12d are connected depending on the width of the thin plate 3.
The effective core length is adjusted from the center of the thin plate 3 toward both sides.

In addition, although the structure in which the iron core is divided into three is shown in the second embodiment/example, the number of divisions can be arbitrarily selected.

[Effects of the Invention 1] As explained above, according to the present invention, the energizing circuit can be changed with an extremely simple structure of just switching taps, the device can be made smaller without the need for a drive mechanism for the iron core as in the past, and the width of the thin plate can be reduced. A transverse magnetic flux type induction heating device is obtained in which the heating range can be easily adjusted according to the conditions.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention. Figure 1 is a plan view of a horizontal IIF + magnetic flux induction heating device, Figure 2 is a front view of Figure 1, and Figure 3 is a tap. The first section is a cross-sectional section taken along the line A-A showing the switching device, the fourth section is a circuit diagram in the case of a twin coil, and FIG. 5 is a plan view of an induction heating device according to another embodiment.
Section 6 is a front cross-sectional view showing a conventional magnetic pole lifting type induction heating device, and FIG. 7 is a plan view showing a conventional magnetic pole rotating type induction heating device. 1-...Support frame 2...Magnetic pole segment 3...
・Thin plate 4... Drive rod 5... Coil
5a...Main coil 5b...Parallel fills 7.7a, 7b, 8...Magnetic pole 11...Feeding terminal 13...Rising portion 15a...Fixed crosspiece 17...Inductor 7c... ... Iron core 9 ... Rotating shaft 12a = 12d ... Tap changer 14 ... Drain port 15b ... Movable contact 18 ... Cooling water

Claims (1)

[Claims] In a transverse magnetic flux type induction heating device in which a concave groove is formed in the iron core, inductors with coils wound thereon are placed facing each other, and the material to be heated is continuously conveyed between the two inductors and heated by induction. , the iron core is divided into a plurality of parts along the conveying direction of the material to be heated, the coils are connected in parallel along the dividing plane to form a lattice-like circuit, and the portions of the circuit along the dividing plane are A transverse magnetic flux type induction heating device characterized by having a tap changer with contacts attached to each of the crossover conductors.