JP2913615B2 - Insulating member and high-frequency heating device using the same - Google Patents

Abstract

PURPOSE: To surely insulate between conductors in a fixed coil side and a movable coil side, in a high frequency induction heating apparatus, in which the fixed coil and the movable coil are combined so as to make the heating range in the axial length direction of a work W adjustable. CONSTITUTION: An insulating members 30, 30 are fitted to linear conductors 21, 21 of the movable coil 20 overlapped with heating conductors 11, 11 of the fixed coil 10. The insulating member 30 is formed into a box type incorporating the linear conductor 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating member used for a high-frequency heating device for heating the outer peripheral surface of a cylindrical workpiece for surface quenching, and a high-frequency heating device using the insulating member.

[0002]

2. Description of the Related Art There is a high-frequency heating apparatus for heating the outer peripheral surface of a columnar work in order to harden a surface of the work, which can adjust a heating range in an axial direction in accordance with the total length of the work. FIG. 2 shows the basic configuration of this high-frequency heating device.

This high-frequency heating device includes a fixed coil 10 for heating and a movable coil 20 for adjusting a heating range. The fixed coil 10 is a so-called semi-open heating coil, and has a pair of heating conductors 11 extending in the axial direction of the workpiece W. The heating conductors 11 and 11
And oppose the outer peripheral surface of the work W. One end of each of the heating conductors 11 is substantially 1 /
4 arc conductors 12, 12 and L-shaped lead conductor 13,
The power supply plates 15, 15 are connected to each other via the power supply 13. The power supply plates 15 are insulated by an insulating plate 16 and connected to a high-frequency power source (not shown). The other ends of the heating conductors 11 and 11 are connected by a connection conductor 14 having a substantially 1/2 arc.

The movable coil 20 includes a pair of linear conductors 2 extending in the axial direction of the workpiece W along the heating conductors 11.
1, 21. The straight conductors 21 and 21 are fixed coils 1
0 heating conductors 11, 11. For insulation, an insulating sheet 24 made of Teflon is fixed on the upper surfaces of the heating conductors 11 and 11 by tape winding. One ends of the straight conductors 21 and 21 (ends on the side of the heating conductors 11 and 11) are connected to the connection conductor 22 having a substantially 円 arc that straddles the work W.
Are connected to each other. The other ends of the straight conductors 21 and 21 from the center are connected to each other by a plate-shaped conductor 23 having a substantially half-arc shape similar to the connection conductor 22. The plate-shaped conductor 23 is located inside the connection conductor 14 of the fixed coil 10. The entire movable coil 20 is
Can move in the axial direction.

When heating the work W, the work W
A high-frequency current is supplied to the fixed coil 10 while rotating. Then, an induced current is generated in the plate-shaped conductor 23 of the movable coil 20, and a high-frequency current also flows in the movable coil 20. At this time, the directions of the current flowing through the heating conductors 11 and 11 of the fixed coil 10 and the current flowing through the linear conductors 21 and 21 of the movable coil 20 overlapping the heating conductors 11 and 11 are reversed. Therefore, the heating conductors 11 and 11 and the straight conductor 2
In the overlapping portions of 1,21, the magnetic fluxes cancel each other.
Therefore, the outer peripheral surface of the workpiece W is heated by the portions of the heating conductors 11, 11 except for the overlapping portions with the straight conductors 21, 21. By moving the movable coil 20 in the axial direction of the work W, the heating range in the axial direction is adjusted according to the overall length of the work W and the like.

[0006]

In such a high-frequency heating apparatus of the heating range adjustment type, the linear conductor 2 of the movable coil 20 is placed on the heating conductors 11 of the fixed coil 10.
1,21 overlap. Therefore, it is necessary to electrically insulate them. Conventionally, as described above, the insulating sheet 2 made of Teflon is provided on the upper surfaces of the heating conductors 11, 11.
4 was fixed with tape. The fixing of the insulating sheet 24 with the tape is performed only when the heating conductors 11 and 11 are used.
The linear conductors 21 and 21 slide on the
This is because there is a risk that the insulating sheet 24 may come off.

However, in the heating range-adjustable high-frequency heating apparatus, each time one work W is processed, the heating conductors 11 are placed on the heating conductors 11 (especially near the ends of the linear conductors 21 and 21).
Sludge accumulates in In conventional insulation, accumulated sludge penetrates between the tapes and causes insulation failure.
Each time the book work W is processed, it is necessary to blow the sludge with air, and thus the work efficiency is low.

The present invention has been made in view of such circumstances, and has no danger of detachment when used in a high-frequency heating device of a heating range adjustment type, and can eliminate the danger of insulation failure due to sludge accumulation. An object of the present invention is to provide an insulating member and a high-frequency heating device of a heating range adjustment type using the insulating member.

[0009]

SUMMARY OF THE INVENTION An insulating member according to the present invention extends in the axial direction of a columnar work and sandwiches the work.
A pair of heating guides facing two circumferential positions on the outer peripheral surface of the work
One end of the heating conductor straddles the workpiece.
The other end is connected to a high-frequency power supply.
A fixed heating coil and a pair of heating conductors
A pair of straight lines stacked on top and extending in the axial direction of the workpiece
A conductor, and the end of the straight conductor on the heating conductor side
It is connected by a straddling connection conductor, and one
A pair of linear conductors are connected by a plate-shaped conductor,
For adjusting the heating range supported movably in the axial direction of the workpiece
Section used for high-frequency heating device having movable coil
Material, provided along each lower surface of the pair of linear conductors
Between the straight conductor and the heating conductor below it.
It has a surface part, and rises the entire periphery of the plane part upward,
It is configured to accommodate a linear conductor like a box.

A high-frequency heating device according to the present invention has a pair of heating conductors extending in the axial direction of a cylindrical work and opposed to two circumferential positions on the outer peripheral surface of the work with the work interposed therebetween.
One end of the heating conductor is connected by a connection conductor straddling the work, the other end is connected to a fixed coil for heating connected to a high-frequency power supply, and the heating conductor is superimposed on each of the pair of heating conductors. It has a pair of linear conductors extending in the axial direction, the heating conductor side ends of the linear conductors are connected by connecting conductors that straddle the work, and the pair of linear conductors are connected by a plate-shaped conductor on the anti-heating conductor side. , A movable coil for adjusting the heating range, which is supported so as to be movable in the axial direction of the work, and is provided along each lower surface of the pair of linear conductors and is interposed between the linear conductor and the heating conductor thereunder. And an insulating member that accommodates a linear conductor like a box by raising the entire periphery of the flat portion upward.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.
I do. FIG. 1 shows a high-frequency heating apparatus according to one embodiment of the present invention.
It is a perspective view.

As shown in FIG.
A fixed coil 10 for heating the workpiece W, a movable coil 20 for adjusting the heating range, and a pair of insulating members 30 for insulating between the fixed coil 10 and the movable coil 20;
30. The fixed coil 10 is fixed on a fixed base, and the movable coil 20 can move on the fixed base in the axial direction of the workpiece W.

In the present high-frequency heating apparatus, the insulating member 3
0,30 is important. Since the specific configurations of the fixed coil 10 and the movable coil 20 are substantially the same as those of the conventional device shown in FIG. 3, the same portions are denoted by the same reference numerals and description thereof will be omitted.

The insulating members 30, 30 are made of synthetic resin having excellent insulation and heat resistance such as Teflon, and are mounted on the linear conductors 21, 21 of the movable coil 20, respectively.
Each insulating member 30 includes a flat plate portion 31 provided along the entire lower surface of the linear conductor 21 and a square frame-shaped rising portion 32 formed by raising the entire periphery of the flat plate portion 31 upward.
By providing the rising portion 32, the insulating member 30 is mounted on the linear conductor 21 from below like a cap, and accommodates the linear conductor 21 like a box.

The insulating members 30 and 30 are formed such that the flat plate portion 31 has the heating conductors 11 and 11 of the fixed coil 10 and the heating conductors 11 and 1.
It is interposed between the first linear conductors 21 and 21 and is insulated therebetween. In addition, since the linear conductor 21 is accommodated like a box, the movable coil 20 is not separated from the linear conductor 21 even when the movable coil 20 moves in the axial direction of the work W. This eliminates the need to blow off sludge with air, since there is no danger of insulation failure due to the accumulation, if any.

[0016]

As described above, the insulating member according to the present invention
Extends in the axial direction of the cylindrical workpiece, and sandwiches the workpiece.
A pair of heating guides facing two circumferential positions on the outer peripheral surface of the work
One end of the heating conductor straddles the workpiece.
The other end is connected to a high-frequency power supply.
A fixed heating coil and a pair of heating conductors
A pair of straight lines stacked on top and extending in the axial direction of the workpiece
A conductor, and the end of the straight conductor on the heating conductor side
It is connected by a straddling connection conductor, and one
A pair of linear conductors are connected by a plate-shaped conductor,
For adjusting the heating range supported movably in the axial direction of the workpiece
Section used for high-frequency heating device having movable coil
Material, provided along each lower surface of the pair of linear conductors
Between the straight conductor and the heating conductor below it.
It has a surface part, and rises the entire periphery of the plane part upward,
It is configured to accommodate a linear conductor like a box. Therefore, this insulating member prevents the accumulation of sludge between the movable coil and the fixed coil, eliminates the danger of insulation failure due to the accumulation of sludge, and eliminates the need to blow off sludge, thereby improving work efficiency. To improve. In addition, since it is box-shaped, there is no danger of detachment from the conductor even if the movable coil moves, and in this respect, the reliability is excellent.

In the high-frequency heating device of the heating range control type according to the present invention, since the above-mentioned insulating member is used for insulation between the conductors on the fixed coil side and the movable coil side, there is a danger of insulation failure due to sludge accumulation. No sludge blow-off work is required. Therefore, work efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a high-frequency heating device showing one embodiment of the present invention.

FIG. 2 shows a basic configuration of a heating range-adjustable high-frequency heating device.
FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fixed coil 11 Heating conductor 14 Connection conductor 20 Moving coil 21 Linear conductor 22 Connection conductor 23 Plate conductor 30 Insulating member 31 Flat plate part 32 Start-up part

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ identification symbol FI // H01B 3/00 H01B 3/00 Z (58) Field surveyed (Int. Cl. ⁶ , DB name) C21D 1/10, 1/18 C21D 1 / 42,1 / 62 H05B 6/10 H01B 3/00

Claims (2)

(57) [Claims] A cylindrical work extending in an axial direction of the work;
Work facing the two circumferential positions on the outer peripheral surface of the work
It has a pair of heating conductors and one end of the heating conductors
Connected by a connecting conductor that straddles the workpiece, and the other end is high
A fixed coil for heating connected to the
Overlaid on each upper side of the heat conductor and extends in the axial direction of the work
It has a pair of straight conductors, and the heating conductor side end of the straight conductors
Are connected by a connecting conductor that straddles the workpiece,
Are connected by a plate-shaped conductor.
And the whole is supported movably in the axial direction of the workpiece.
For high-frequency heating equipment with movable coil for heat range adjustment
An insulating member to be used, wherein each lower surface of said pair of linear conductors
Between the straight conductor and the heating conductor below it
Has a plane part interposed therebetween, and the entire periphery of the plane part is upward.
It is characterized by standing up and housing a straight conductor like a box
Insulation member. 2. A pair of heating conductors extending in the axial length direction of a columnar work and opposed to two positions in a circumferential direction of an outer peripheral surface of the work with the work interposed therebetween, and one end of the heating conductor is connected to the work. A fixed coil for heating connected at the other end to the high-frequency power supply, and a pair of linear conductors extending on the upper side of the pair of heating conductors and extending in the axial direction of the work. Then, the heating conductor side end of the linear conductor is connected by a connecting conductor that straddles the work, and a pair of linear conductors is connected by a plate-shaped conductor on the anti-heating conductor side, and the whole can move in the axial direction of the work A movable coil for adjusting a heating range supported by the pair of linear conductors, and a flat portion provided along each lower surface of the pair of linear conductors and interposed between the linear conductor and the heating conductor thereunder; Raise the entire surroundings upwards, like a box High frequency heating apparatus characterized by comprising an insulating member for accommodating the straight conductor.