JP2001006862A - Electromagnetic induction heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic induction heating device allowing the weight of a magnetic shield plate to be reduced and thereby improving workability in maintenance. SOLUTION: This electromagnetic induction heating device is composed by forming a magnetic shield plate 7 for adjusting a magnetic field from magnetic pole segments 5 movably inward and outward in the widthwise direction of a strip 1 in a region close to both edges of the strip 1. In this case, the magnetic shield plate 7 is formed of an aluminum material.

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 apparatus, and more particularly to an electromagnetic induction heating apparatus for continuously heating a thin plate called a strip conveyed in a predetermined flow direction by electromagnetic induction.

[0002]

2. Description of the Related Art As this type of electromagnetic induction heating apparatus, there is an apparatus for heating a strip having a length longer than a width by using electromagnetic induction. Such an electromagnetic induction heating device comprises an electromagnet device arranged on one or both sides of the strip so as to face the strip in the width direction of the strip, and the electromagnet device is excited by an alternating current. In this electromagnetic induction heating device, it is desirable that heating can be performed with a uniform temperature distribution in the width direction of the strip. This type of electromagnetic induction heating device generates an electromagnetic induction heating device (called an LFX type electromagnetic induction heating device) that heats a strip by generating magnetic lines of magnetic force (magnetic flux) in the strip conveying direction, and generates magnetic lines of force in the vertical direction of the strip. An electromagnetic induction heating device (hereinafter, referred to as a VFX type electromagnetic induction heating device) (hereinafter, referred to as a VFX device) for heating a strip by heating. In addition,
Both LFX and VFX are registered trademarks of Sumitomo Heavy Industries, Ltd.

Conventionally, there have been proposed various VFX devices for uniformly heating the temperature distribution in the width direction of a strip.

[0004] For example, Japanese Patent Publication No. 63-27836 proposes the following VFX device. Figure 1
Referring to FIG. 4, in this VFX apparatus, strip 1 having a length longer than its width is continuously fed in the direction of the arrow as a sheet to be heated, that is, in the length direction.

As shown in FIG. 2, an electromagnet device 2 constituting a VFX device is arranged in the width direction of the strip 1. The electromagnet device 2 is, as shown in FIG.
Are disposed opposite to each other on the upper and lower surfaces of the. Each electromagnet device 2 has a width corresponding to the widest strip heated by this VFX device, irrespective of the width of the strip 1 currently heated.

In this type of VFX device, it is required to heat the strip 1 uniformly in its width direction. In order to achieve this requirement, the magnetic field generated by each electromagnet device 2 needs to have a predetermined distribution in the width direction of the strip 1. The magnetic field distribution in the width direction is not uniform, and if the width of the strip 1 changes, the magnetic field distribution must also be changed.

Referring to FIG. 1, of the electromagnet device constituting the VFX device, a portion along a line AA in FIG. 3 is partially cut away. Referring to FIG. 4, there is shown a sectional view taken along line BB of FIG. 1 and 4, only a part of one electromagnet device 2 is shown, but other electromagnet devices have the same structure. As is clear from FIG. 1, the end of the electromagnet device 2 is outside the edge of the strip 1. The other end of the electromagnet device 2 has a similar structure.

The illustrated electromagnet device 2 has a plurality of main magnetic pole elements (hereinafter referred to as magnetic pole segments) 5 which are divided in the width direction of the strip 1 and arranged in parallel. It faces the strip 1. These pole segments 5 are supported in the support frame 3,
Further, the coil 4 is provided commonly to the magnetic pole segments 5.

More specifically, each magnetic pole segment 5 includes:
As shown in FIG. 4, it has a comb shape having four legs and a bridging portion. The legs corresponding to each other in each pole segment 5 are commonly provided with coils 4a, 4b, 4c,
4d is wound to form four sets of electromagnet blocks. Currents of opposite polarities flow through adjacent coils. The bridge of each pole segment 5 is connected to a drive rod 10, which extends outside the support frame 3.
A rack is provided on the side of the drive rod 10, and the rack meshes with a gear constituting the drive mechanism 8. Further, the legs of each magnetic pole segment 5 are supported and guided by a guide mechanism 9 provided inside the support frame 3.

In this configuration, by rotating the drive mechanism 8, the magnetic pole segment 5 can be made to approach in the direction of the strip 1, and the magnetic pole segment 5 can be kept away from the strip 1. In this case, the ends of the coils 4a, 4b, 4c, 4d are supported and fixed to the support frame 3, as shown in FIG. 1, and each magnetic pole segment 5 is surrounded by the coils 4a, 4b, 4c, 4d. In and out of the space.

[0011] Further, as shown in FIG.
A plate-like magnetic shielding plate 7 made of a nonmagnetic metal material having good electric conductivity is provided in a region near the edge of the strip 1. The magnetic shielding plate 7 has a size corresponding to four sets of electromagnet blocks, is driven by the shielding plate driving mechanism 11, and is supported and guided so as to be able to protrude and retract in the width direction of the strip 1 via the shielding plate supporting and guiding mechanism 6. Is done. This magnetic shielding plate 7
It functions as magnetic shielding means for shielding the magnetic field from the magnetic pole segment 5a at the retracted position pulled out of the coil 4 in the direction away from the strip 1 with respect to the strip 1. That is, when the magnetic shield plate 7 is not provided, even if the magnetic pole segment 5 is pulled out of the coil 4,
A considerable magnetic field remains at the ends of the strip 1, whereby the ends of the strip 1 are locally heated, and the temperature distribution in the width direction becomes uneven. Therefore, this residual magnetic field is transferred to the magnetic shielding plate 7.
This is effective for improving the heating temperature distribution.

In FIG. 1, for convenience, the magnetic shielding plate 7
Shows one of the two sides in the arrangement direction of the magnetic pole segments 5, but a similar magnetic shielding plate is also provided on the other side. FIG. 5 is a sectional view taken along line CC of FIG.

By the way, apart from the above-mentioned magnetic shielding plate, a magnetic shielding means called a magnetic shielding block is used for the strip 1.
May be used on both sides. Referring to FIGS. 6 and 7, the configuration of the electromagnet device itself is the same as that shown in FIG. 1, but the magnetic shielding block 21 has a U-shaped cross section and is a region of the electromagnet device. Moreover, the magnetic field from the magnetic pole segment 5 is adjusted so as to surround each edge on both sides of the strip 1 and to be able to protrude and retract in the width direction of the strip 1. The magnetic shielding block 21 is driven by a shielding block driving mechanism 22 similar to that described with reference to FIG. Strictly speaking, the magnetic shielding plate 7 has a function of shielding magnetic flux, so to speak, whereas the magnetic shielding block 21 passes the magnetic flux through itself, so that the magnetic flux is detoured to the edge of the strip 1. Have the function to make. For this reason, a laminated body of a silicon steel plate is used for the magnetic shielding block 21.

[0014]

As described above, the magnetic shielding plate used in the conventional VFX device is made of a copper material in consideration of the magnetic shielding effect. However, the magnetic shielding plate made of a copper material has a problem that the weight per unit area is large and the workability during maintenance is poor. That is, at the time of maintenance, it is necessary to remove the magnetic shielding plate, and if the weight is large, the working time becomes longer, and more workers and tools necessary for the work are required.

On the other hand, a magnetic shielding block made of a laminated body of silicon steel sheets generates heat by eddy current action. This heat generation is a problem in that the life of the magnetic shielding block is shortened.

It is an object of the present invention to provide an electromagnetic induction heating device capable of reducing the weight of a magnetic shielding plate and improving workability during maintenance.

Another object of the present invention is to provide an electromagnetic induction heating device capable of reducing the heat generation effect of the magnetic shielding block and extending the life.

[0018]

According to a first aspect of the present invention, there is provided an electromagnetic induction heating apparatus for heating a thin sheet conveyed in a predetermined direction by electromagnetic induction, wherein the thin sheet is parallel to each other in a sheet width direction. A plurality of magnetic pole segments arranged so as to face the thin plate, a drive mechanism for moving each magnetic pole segment independently of the other magnetic pole segments in the thickness direction of the thin plate, and the plurality of magnetic pole segments. At least one set of a combination of coils surrounding the plurality of pole segments and disposed on at least one surface side of the thin plate is provided, and is further provided near both edges of the thin plate. An electromagnetic induction heating device comprising a non-magnetic metal movable shield plate for adjusting a magnetic field from the magnetic pole segment so as to be able to protrude and retract in the width direction of the thin plate in the region; The electromagnetic induction heating device characterized by being constituted by an aluminum material is provided.

According to a second aspect of the present invention, there is provided an electromagnetic induction heating apparatus for heating a thin plate conveyed in a predetermined direction by electromagnetic induction, wherein the thin plate is parallel to each other in a width direction of the thin plate and opposed to the thin plate. A plurality of magnetic pole segments arranged so as to perform, and a driving mechanism for moving each magnetic pole segment independently of the other magnetic pole segments in the thickness direction of the thin plate,
At least one set of a combination body that is disposed so as to surround the plurality of magnetic pole segments and includes a coil common to the plurality of magnetic pole segments is disposed on at least one surface side of the thin plate. A movable shielding block having a U-shaped cross section that adjusts the magnetic field from the magnetic pole segment so as to surround each edge in the area of the combination and on both sides of the thin plate and to be able to protrude and retract in the width direction of the thin plate is provided. An electromagnetic induction heating device is provided, wherein the movable shielding block is made of a ferrite material.

[0020]

The first embodiment of the present invention will be described below. The first embodiment is applied to the VFX device as described with reference to FIG. 1, and is characterized in that a magnetic shield having the same structure as the magnetic shield 7 in FIG. 1 is made of aluminum. The aluminum material has a magnetic shielding effect, and the weight per unit area is about 1/3 as compared with the copper material. Conventional magnetic shielding plates made of copper material depend on the size,
While the magnetic shield plate according to the present embodiment weighs about 6 to 30 (Kg), while weighing about 20 to 100 (Kg).
As a result, the magnetic shield plate according to the present embodiment has an advantage that workability during maintenance is good. That is, at the time of maintenance, it is necessary to remove the magnetic shielding plate, but since the weight is light, the working time is short, and the number of operators and tools required for the working is small.

Next, a second embodiment of the present invention will be described. This second embodiment is based on V as described with reference to FIG.
Applied to the FX device, the magnetic shield block having the same structure as the magnetic shield block 21 of FIG. 6 is characterized in that it is made of a ferrite material.

The difference between the ferrite material in the present embodiment and the conventional silicon steel sheet is as shown in Table 1 below. The ferrite material has an advantage that the heat generation action is smaller than that of the silicon steel sheet and processing is easy. .

[0023]

[Table 1]

Although the present invention has been described with reference to several embodiments, the present invention can be variously modified. For example, VFX with electromagnet devices on both sides of the strip
Although the present invention has been described as applied to the device, the present invention can also be applied to a VFX device in which an electromagnet device is disposed on only one side. Further, the electromagnetic induction heating device according to the present invention is applicable to fields such as aluminum annealing, lamination coating baking, SUS annealing, and copper annealing.

[0025]

As described above, according to the present invention, the workability during maintenance can be improved by reducing the weight of the magnetic shielding plate. In addition, since the heat generation function of the magnetic shielding block can be reduced, the life can be extended.

[Brief description of the drawings]

FIG. 1 is a sectional view partially showing a configuration of a conventional electromagnetic induction heating device to which a first embodiment of the present invention is applied.

FIG. 2 is a plan view schematically showing the entire configuration of the electromagnetic induction heating device of FIG.

FIG. 3 is a schematic view of the electromagnetic induction heating device shown in FIG. 2 as viewed from a side.

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is a diagram of the electromagnetic induction heating device of FIG. 1 as viewed from a line CC.

FIG. 6 is a view of the configuration of a conventional electromagnetic induction heating device to which the second embodiment of the present invention is applied, viewed from the same direction as FIG. 5;

FIG. 7 is a side view of the magnetic shielding block shown in FIG. 6 as viewed from a strip transport direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strip 2 Electromagnet apparatus 3 Support frame 5, 5a Magnetic pole segment 6 Shield support support mechanism 7 Magnetic shield 8 Drive mechanism 9 Guide mechanism 10 Drive rod 11 Shield board drive mechanism 21 Magnetic shield block 22 Shield block drive mechanism

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Isamu 5-2, Sokai-cho, Niihama-shi, Ehime Prefecture Inside the Niihama Works of Sumitomo Heavy Industries, Ltd. No. Sumitomo Heavy Industries, Ltd. Niihama Works (72) Inventor Tatsuro Araki 5-9-1, Kitashinagawa, Shinagawa-ku, Tokyo Sumitomo Heavy Industries, Ltd.F-term (reference) 3K059 AA09 AB19 AB20 AB26 AB28 AC37 AC54 AC62 AD26 AD40 CD14 CD44 CD73 CD75

Claims (2)

[Claims] 1. An electromagnetic induction heating device for heating a thin plate conveyed in a certain direction by electromagnetic induction, comprising a plurality of magnetic poles arranged in parallel in the width direction of the thin plate and opposed to the thin plate. Segment, a drive mechanism for moving each magnetic pole segment independently of the other magnetic pole segments in the thickness direction of the thin plate, and a drive mechanism arranged to surround the plural magnetic pole segments and common to the plural magnetic pole segments. At least one set of a combination of a coil and a coil is disposed on at least one side of the thin plate;
An electromagnetic induction heating apparatus comprising a non-magnetic metal movable shield plate for adjusting a magnetic field from the magnetic pole segment so as to be able to protrude and retract in a width direction of the thin plate in a region near both edges of the thin plate, wherein the movable shield plate is made of aluminum. An electromagnetic induction heating device comprising a material. 2. An electromagnetic induction heating device for heating a thin plate conveyed in a certain direction by electromagnetic induction, comprising a plurality of magnetic poles arranged in parallel in the width direction of the thin plate and opposed to the thin plate. Segment, a drive mechanism for moving each magnetic pole segment independently of the other magnetic pole segments in the thickness direction of the thin plate, and a drive mechanism arranged to surround the plural magnetic pole segments and common to the plural magnetic pole segments. At least one set of a combination of a coil and a coil is disposed on at least one side of the thin plate;
A movable shielding block having a U-shaped cross section that adjusts the magnetic field from the magnetic pole segment so as to surround the respective edges on the both sides of the thin plate in the area of the combination body and so as to be able to protrude and retract in the width direction of the thin plate. An electromagnetic induction heating apparatus comprising: a movable shielding block formed of a ferrite material;