JP2529852B2 - Induction heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an induction heating device for induction heating a work for the purpose of quenching, tempering, etc. More specifically, a plurality of single induction heating devices equipped with a predetermined power source are provided. The present invention relates to an induction heating device, which is equipped with a heating coil, and selectively uses the heating coil according to the shape and size of a workpiece to be fed or heating conditions.

(Prior Art) In some cases, an induction heating device having a predetermined power supply has a configuration including a plurality of heating coils. For example, when a plurality of different types of workpieces are randomly sent, a plurality of different types of workpieces are sequentially fed in lot units, but when the lot contents are each a decimal number, the same type of workpieces are fed, but different workpieces are fed. An induction heating device is fed when heating the heating parts separately or sequentially heating the same heated parts of the same kind of work under different conditions (for example, heating for quenching and heating for tempering). A plurality of heating coils are provided in advance so that the shape, size, and heating conditions of the work can be immediately dealt with, and the selection and use can be made properly.

This kind of induction heating equipment
Shown in the figure.

In the figure, E is a power supply, T'is a matching transformer, C1 to C4 are heating coils, and S is a switch.

The heating coils C1 to C4 are fixed to a supporting member shown as K, for example, and the supporting member K is movable as shown by an arrow. However, it is possible to place the respective input terminals a and b at positions corresponding to the output terminals c and d extending from the secondary side conductor of the transformer T ′. Therefore, when a certain work is fed, the one suitable for the work is selected from the heating coils C1 to C4, for example, the heating coil C2 is selected, and the input terminals a and b of the heating coil C2 are connected to the transformer T '. Output terminal c, d
The support member K is moved to a position corresponding to, and then the switch S is operated to close the circuit between the power source E and the heating coil C2 to heat the work W.

(Problems existing in the prior art) By the way, although the induction heating device uses a large current, the output terminal c,
In the induction heating device having the above-mentioned configuration, which is premised on frequent connection and disconnection between d and the input terminals a and b of each heating coil C1 to C4, the contact parts are extremely worn due to arc flaws generated at the time of switching. Fierce.

For example, when an oscillator of 30 to 40 KHz and 150 Kw is used as a power source, although a current of 5000 to 15000 A flows through the contact portion, the generated arc is large, although it depends on the load.

If the contact portion wears, the operation of the induction heating device must be stopped and the portion must be replaced with a new one, which lowers productivity and increases repair costs. Therefore, a countermeasure has been desired.

(Object of the Invention) The present invention solves the above-mentioned problems in a conventional induction heating apparatus that includes a plurality of heating coils and can selectively use the heating coils according to the shape, size, or heating conditions of a workpiece to be fed. Therefore, it was made to further improve the function of this type of induction heating device, which eliminates the operation stoppage of the induction heating device due to wear of the contacts, and aligns the induction heating device itself with the workpiece. An object of the present invention is to provide an induction heating device capable of greatly expanding the width and increasing the kinds of workable materials.

(Structure of the Invention) The gist of the present invention is (1) an induction heating device comprising a plurality of heating coils, wherein the heating coils can be selectively used according to the shape, size, or heating conditions of a workpiece to be fed. ) The transformer to which the above heating coil is mounted has a different number of turns of the conductor from the primary side, which is one element with a predetermined number of turns of the conductor connected to the power source, or the same number of turns. A secondary side, which is a plurality of elements having different coil shapes or different numbers of windings and heating coil shapes; (3) The conductor winding inner diameter of each of the secondary sides is set to the conductor of the primary side. The windings are formed to have the same size as the outer diameter, which is slightly larger than the outer diameter. (4) Each of the secondary side conductors moves simultaneously or individually relative to the primary side, and any one of the plurality of windings is wound on the primary side. Separate a predetermined gap from the outer circumference (5) Only the primary side and the secondary side occupying the facing position are electromagnetically coupled to form a transformer, and the heating coil mounted on the secondary side heats the transformer. The induction heating device is characterized by being set to be executed.

(Operation of the Invention) The present invention includes one primary side and a plurality of secondary sides as transformer elements, and a heating coil is attached to each secondary side,
Since each secondary side integrated with the heating coil is moved relative to the primary side so as to face the primary side, a plurality of different combinations of the transformer and the heating coil are automatically formed without switching the contacts. , And each of the plurality of combinations formed can have different matching functions.

(Example 1) The present invention will be described in detail below with reference to the first example shown in FIGS. 1 (a) and 1 (b).

In the figure, E is a power supply, and 1 is a circuit such as a bus bar.
Connected to the power source E via 11 and a primary side composed of a predetermined number of turns of the conductor and a winding diameter as an element forming a transformer together with a secondary side, which will be described later, 2a to 2d are designated by 3 at predetermined intervals on a table. A secondary side, which is arranged in a row at a distance from each other, and which is composed of a wound conductor as an element forming a transformer together with the primary side 1,
C1 to C4 are heating coils mounted on the respective secondary sides 2a to 2d via leads R.

The circuit 11 connecting the power source E and the primary side 1 is set so that the primary side direction portion is a linear portion, and the length of the linear portion is at least the secondary side 2a arranged on the table 3.
Maintain a column length of ~ 2d or more.

In the present embodiment, the primary side 1 is fixed to a stationary circuit 11 and has a winding end face directed in the left-right direction.

Each of the secondary sides 2a to 2d is formed such that the inner diameter of the conductor forming the secondary side is slightly larger than the outer diameter of the conductor winding of the primary side 1 and the number of turns of the conductor is different. In this case, there are various cases such as the case where the number of turns is the same, but the shape of the attached heating coil C is different, and the case where the both are mixed. Further, each of the secondary sides 2a to 2d has the winding end face in the left-right direction, and the primary side 1
The winding axes are arranged on the table 3 so that the winding axes are aligned with each other.

Each of the heating coils C1 to C4 may have a different shape, and even if the heating coils C1 to C4 have the same shape, the number of turns of the conductor on the secondary side to which they are connected may be different.

The table 3 is configured to be movable in the left-right direction in parallel with the straight line portion of the circuit 11 according to the arrow shown.

Therefore, if the table 3 is moved sufficiently to the right, for example, as shown in FIG. 1 (a), the secondary side 2a arranged on the table 3 is positioned on the outer periphery of the primary side 1 that maintains the fixed state. Then, an electromagnetically coupled state is generated between the primary side 1 and the secondary side 2a which face each other to form the transformer T1. If the table 3 is moved to the left by a predetermined amount, as shown in FIG. 1 (b), the secondary side 2c arranged on the table 3 is located on the outer periphery of the primary side 1 and is opposed to the primary side. An electromagnetic coupling state occurs between the primary and secondary sides 2c to form the transformer T3, and similarly the transformer
T2 and T4 can also be formed.

As described above, according to the present invention, the transformers T1 to T4 can be individually formed automatically by moving the table 3, and each heating coil C1 to C4 can be formed without switching the contacts as in the conventional induction heating apparatus.
-The circuit between the power supplies E can be individually closed. In addition, since the transformers T1 to T4 to be formed each have different combinations of the shapes of the heating coils C1 to C4 and the conductor turn ratios between the primary side and the secondary side, there are differences in the matching function of each. As a result, the induction heating apparatus greatly expands the matching width with respect to the work, and increases the types of work that can be processed.

(Example: 2) FIG. 2 shows a second example of the present invention.

In the figure, E is a power source, 1 is a primary side connected to the power source E, and 2a to 2c are secondary sides made of winding conductors arranged at predetermined intervals on a table 3 which can be moved according to an arrow. , Heating coils C1 to C3 are attached to the secondary sides 2a to 2c, respectively, but since the heating coils C1 to C3 are located in the front direction via the lead R, the drawing showing the cross section in this figure I can't see. The second embodiment is different from the first embodiment in that the winding axes of the primary side 1 and the secondary sides 2a to 2c are in the vertical direction, and the primary side 1 is, for example, a flexible conductor. Is connected to a power source E via a circuit 12 consisting of, and an electric insulating material 4 is fixedly attached to the upper end face thereof, and a rod 5 of a vertical displacement mechanism (not shown) is connected to the electric insulating material 4 for vertical displacement. The mechanism is configured so that the primary side 1 can be displaced upward or downward.

Therefore, when forming a desired transformer T, first, the primary side 1 is first displaced upward, and the table 3 is moved to the left or right by a predetermined amount to move the desired secondary side 2 to the primary side 1.
The primary side 1 may be displaced downward while being positioned immediately below.

The second embodiment also has exactly the same operation as the first embodiment,
Be effective.

(Other Embodiments) FIG. 3 shows a case where the table 3 movable in the left-right direction in FIG.
The other structure is the same as that of the second embodiment, and its operation and effect are the same as those of the first and second embodiments.

Further, in FIGS. 1 to 3 shown above, the primary side 1 is placed at a predetermined position separated from the heating fixed position by a predetermined amount, and the table 3 is placed.
In this example, the heating coil C mounted on the secondary side 2 which is moved to a position facing the primary side 1 by displacing 31 to 31 occupies a fixed heating position. Needless to say, the movable and secondary sides 2 may be immovable to change the work loading and heating positions.

Further, although not shown, the primary side 1 is arranged at a heating fixed position so as to be vertically displaceable, and a plurality of secondary sides 2 are arranged in a fan shape around the primary side 1 and the secondary sides 2 are individually arranged. Alternatively, the primary side may be configured to be able to move forward and backward in one direction.

(Effect of the invention) By carrying out the present invention, since there is no operation stoppage of the induction heating device due to wear of the contacts, it is possible to improve productivity and to contribute to cost reduction by eliminating expenses for repair, Further, since the matching width of the induction heating device with respect to the work is greatly expanded, the effect of being able to increase the number of types of work that can be processed is prized as being extremely remarkable.

[Brief description of drawings]

1 (a) and 1 (b) are sectional plan views showing a first embodiment of the present invention, FIG. 2 is a sectional front view showing a second embodiment of the present invention, and FIG. 3 is the present invention. FIG. 4 is a plan view showing a third embodiment of the present invention, and FIG. 4 is a plan view showing a conventional example. C1 to C5 …… Heating coil W …… Workpiece E …… Power supply T, T1 to T5 …… Transformer 1 …… Primary side 2,2a to 2e …… Secondary side

Claims (1)

(57) [Claims] 1. An induction heating apparatus comprising a plurality of heating coils, wherein the heating coils can be selectively used according to the shape, size, or heating conditions of a workpiece to be fed, and the transformer in which the heating coils are mounted is a power source. The number of windings of the conductor is different from the primary side, which is one element with a predetermined number of windings of the conductor, or the number of windings is the same and the heating coil shape is different, or the number of windings and the heating coil are different. With a secondary side that is a plurality of elements having different shapes, each of the secondary side conductor winding inner diameter is formed to have the same dimension as the primary side conductor winding outer diameter, which is slightly larger. Each of the secondary side conductors moves simultaneously or individually relative to the primary side so that any one of the plurality of secondary side conductors is displaceable to a position facing the winding outer circumference of the primary side with a predetermined gap therebetween. Position Induction heating apparatus only between the primary side and the secondary side Mel form a transformer electromagnetically coupled, the secondary side mounted heating coil is characterized by being configured to perform heating.