JP2903780B2 - Induction heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating apparatus suitable for heating a lightweight steel section.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view of a deck plate coating apparatus using a conventional induction heating apparatus disclosed in, for example, Japanese Utility Model Laid-Open No. 61-195369. In the drawing, 1 is a deck plate, 2 is a pretreatment device, and 3 is a main magnetic flux in the transport direction.
That, in the induction heating device having an induction heating coil wound in a solenoid shape, the induction heating coil is embedded in the tubular body in which is formed a refractory heat-insulating material, such as refractory cement. 4
Is a coating device disposed on the lower side in the transport direction from the induction heating coil . In such a deck plate coating apparatus, the deck plate 1 sent through a predetermined manufacturing process is subjected to a treatment such as washing in a pretreatment device 2 and passes through the induction heating device 3 when the induction plate 3 passes through the induction heating device 3. To a predetermined temperature. Next, the deck plate 1 is coated by the coating device 4, and the coating film is cured and fixed by the heat of the deck plate 1 itself during traveling.

Here, as shown in FIG. 4, the induction heating device 3 generally transports the deck plate 1 by a metal transport roller (first transport roller) 5 driven by a drive roller (not shown). Is used. For this reason, the surface perpendicular to the longitudinal direction of the deck plate 1 comes into contact with the transport roller 5 at a plurality of places, and as shown in FIG. 5, the deck plate 1 and the transport roller 5 form an annular conductive path (indicated by an arrow in FIG. 5). ) Formed
Then, the main magnetic flux from the induction heating device interlinks with this conductive path, and a circulating current i is generated, and a discharge is generated between the deck plate 1 and the transport roller 5 by the circulating current i. is there.

[0004]

Since the conventional induction heating apparatus is constructed as described above, a discharge is generated between the material to be heated and the transport roller due to a circulating current, so that the paint is not applied when the material to be heated is coated. There is a problem that the volatile solvent may catch fire.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an induction heating device capable of preventing generation and discharge of a circulating current.

[0006]

According to the present invention, there is provided an induction heating apparatus comprising: a predetermined conveying roller disposed near an induction heating coil and affected by a magnetic field of the induction heating coil; By forming the contacting surface with a heat-resistant electrical insulating material, the above-mentioned heated material and the metal material of the above-mentioned transporting roller allow the main magnetic flux to interlink.
The conductive path is prevented from being formed .

[0007]

[Action] induction heating device in this invention, a predetermined conveying roller affected by the magnetic field of the induction heating coil, since to use a conveyance roller configured with an electrically insulating material, conveyed material to be heated This prevents a circulating current from being generated between the roller and the roller.

[0008]

[Embodiment 1] An embodiment of the present invention will be described below with reference to the drawings. FIG.
1 is a side view of an induction heating apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of FIG. In the figure, reference numerals 1 to 5 are the same as those of the related art, and the description is omitted. Reference numeral 6 denotes a second transport roller according to the present invention, which is formed by, for example, providing a heat-resistant electrical insulating member of a predetermined thickness on the surface of a metal roller. Next, the operation will be described. The deck plate 1 transported by the transport roller 5 and the second transport roller 6 is heated to a predetermined temperature when passing through the induction heating device 3, and the heated deck plate 1 is painted when passing through the coating device 4. The coated material to be heated 1 is cured by its own heat during traveling and the coating film is fixed as in the prior art.
Here, as shown in FIG. 2, although the deck plate 1 is in contact with the second conveying roller 6 and plural locations, the plane in which the second conveying roller 6 is in contact with the deck plate 1 of the heat-resistant electrical Deck plate 1 made of insulating material
And is electrically insulated. Therefore, as shown in FIG.
An annular conductive path formed by a deck plate and transport rollers
Is not formed, and no circulating current is generated.

Embodiment 2 FIG. In the above embodiment, the second transfer roller 6 is described as having a heat-resistant insulating material having a predetermined thickness formed on the surface of a metal roller. The same operation as the embodiment can be expected. In the above embodiment, the case where the deck plate is used as the material to be heated has been described. However, if the material to be heated is shaped steel having a shape that comes into contact with the transport roller at a plurality of locations, the same operation as in the above embodiment is expected. it can.

As described above, according to the present invention, in an induction heating apparatus for heating a material to be heated by transporting the material to be heated in contact with the transport roller at least at a plurality of locations, the influence of the magnetic field of the induction heating apparatus the predetermined transport rollers undergoing, than to constitute a surface in contact with at least the material to be heated in the heat-resistant electrically insulating material, the effect of preventing the circulating current occurs is obtained.

[Brief description of the drawings]

FIG. 1 is a side view of an induction heating device for explaining an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of FIG.

FIG. 3 is a perspective view of a deck plate coating apparatus for explaining a conventional induction heating apparatus.

FIG. 4 is a side view of a conventional induction heating device.

FIG. 5 is an enlarged sectional view of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deck plate as a to-be-heated material 3 Induction heating apparatus 5 Transport roller 6 2nd transport roller

Claims (1)

(57) [Claims] 1. A conveying means comprising a plurality of metal-made conveying rollers connected in the conveying direction, an induction heating coil disposed on the upstream side in the conveying direction such that the direction of the main magnetic flux is the conveying direction, and An induction heating device comprising a coating device disposed on the lower side in the transport direction, wherein the material to be heated is transported by the transport means, heated by the induction heating coil, and then heated by the coating device. The predetermined transport roller disposed near the coil and affected by the magnetic field of the induction heating coil, at least a surface of the transport roller that comes into contact with the material to be heated is made of a heat-resistant electrical insulating material. An annular conductive path where the main magnetic flux links with the metal material of the transport roller
An induction heating device, characterized in that the formation of slag is prevented.