JPH10294173A - Induction heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably prevent the application of an improper heating coil to a heating object by providing plural heating coils different in the size to perform induction heating, and heating the heating object by transferring it into its heating coil by selecting a coil adapted to the size of the heating object. SOLUTION: An induction heating device main body 10 has a control means 15 to take in information obtained from a heating coil through a second connecting wire 14, and a display means 17 is also connected to the control means 15. A power source 16 carries an electric current to a resistor R through the control means 15, and detects its resistance value. Map data on which the heating coil and the resistance value are related to each other, is prestored in the control means 15, and a resistance value of the detected resistor R and the map data are comparesd with each other, and a kind of heating coil is specified, and is displayed on the display means 17. Whether or not a kind and the size of the heating coil are adapted to a heating object is confirmed by referring to this display content, and when it is improper, it is replaced with another heating coil, and reselecting processing is performed.

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 for heating an object to be heated, for example, a metal piece for forging. The present invention relates to an induction heating device which is prevented in advance.

[0002]

2. Description of the Related Art FIG. 7 is a plan view showing a conventional induction heating apparatus described in, for example, Japanese Patent Publication No. 55-872. In the figure, a plurality of types of heating coils 1 and 2 having different sizes, for example, inner diameters, are each provided with a central axis C
It is wound cylindrically around 1 and C2.

The object 3 to be heated, which is heated by the heating coil 1 or 2, is transferred on a transfer means, that is, a sled conveyor 5 in synchronization with the rotation of the pinch roller 4. The object to be heated 3 is inserted into the selected heating coil, for example, the heating coil 1 along a central axis C1 indicated by an arrow.

A trolley 6 on which heating coils 1 and 2 are mounted in parallel is movably arranged along rails 7 and 8 to a position 6 '(see a two-dot chain line).
In the direction of transfer of the object to be heated 3 (center axis C1
(See Reference)).

The rails 7 and 8 and the hydraulic cylinder 9 are provided with a heating coil selecting means for selecting one of the plurality of heating coils 1 and 2 which is suitable for the size of the object 3 to be heated and positioning it on the induction heating apparatus main body. Make up.

Here, two types of heating coils 1 and 2 are used.
However, the carriage 6 may be provided with an arbitrary number of heating coils. The heating coil that cannot be mounted on the trolley 6 is disposed in a storage location (not shown).
Any number of heating coils conforming to the specification of the object to be heated 3 may be transferred from the storage location to the carriage 6.

Heating coils 1 and 2 mounted on a trolley 6
Is connected to driving means in an induction heating device main body (not shown), and is selectively supplied with power and driven. Further, a monitoring signal line (not shown) may be drawn out of a predetermined location of the selected heating coil in a non-conductive state, and a monitor signal may be supplied to a control unit in the induction heating device main body.

For example, as shown in FIG.
When the heating coil 1 suitable for the object is selected,
Is transferred from the sled conveyor 5 into the heating coil 1 via the pinch roller 4. Thereafter, the heating target 1 is heated to a predetermined temperature by driving the heating coil 1 in response to a command from a control unit (not shown).

As described above, of the heating coils 1 and 2 prepared in advance, a heating coil having a size suitable for the size of the object 3 to be heated is selected and replaced on the induction heating device main body. By mounting, heat treatment can be performed on the object to be heated 3 having various sizes.

Here, at this time, the size of the heating coil mounted on the induction heating device body is recognized.
This is performed by an operator visually confirming the size (corresponding to the size of the object to be heated 3) printed on each of the heating coils 1 and 2.

[0011] If the selected heating coil is
If the required specifications are not met, the operator will replace the heating coil with another compatible heating coil before driving the heating coil. Therefore, by taking measures based on the recognition of the worker, the transfer of the object to be heated 3 to the inside of the heating coil that is not suitable for the size of the object to be heated 3 is prevented, and the overheating or underheating of the object 3 is prevented.

[0012]

As described above, the conventional induction heating apparatus relies on the visual observation of the operator for recognizing the size of the currently mounted heating coil. Since the size of the heating coil may be overlooked due to fading of printed characters or the like, a heating process using a heating coil that is not suitable for the object to be heated 3 is performed, and overheating or underheating of the object to be heated 3 is caused. There was a point.

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 apparatus in which application of a heating coil that is incompatible with an object to be heated is reliably prevented.

[0014]

According to a first aspect of the present invention, there is provided an induction heating apparatus comprising: a plurality of heating coils of different sizes for induction heating an object to be heated; Heating coil selecting means for selecting an object suitable for the size of the heating coil and positioning it on the induction heating device main body, transferring means for transferring the object to be heated into the heating coil, and a heating coil mounted on the induction heating device main body Heating coil discriminating means for discriminating the type of the heating coil, wherein the heating coil discriminating means is attached to one end of the first connection wire and one end of the first connection wire drawn out of a predetermined position of the heating coil in a non-conductive state. Obtained through the first connector, a second connector detachably attached to the first connector, a second connection line drawn from the second connector, and a second connection line. At the signal And control means for discriminating the type of the heating coil Zui, is intended to include a display unit for displaying the determination result of the control means.

In the induction heating apparatus according to a second aspect of the present invention, in the first aspect, the first connector includes a plurality of terminals, and the heating coil discriminating means includes at least a pair of terminals among the plurality of terminals. Including an impedance element inserted therebetween, the impedance element has a different circuit constant depending on the type of the heating coil.

According to a third aspect of the present invention, in the induction heating device according to the second aspect, the impedance element comprises a resistor having a different resistance value depending on the type of the heating coil.

According to a fourth aspect of the present invention, in the induction heating apparatus according to the third aspect, the heating coil determining means includes an energizing circuit for energizing the resistor, and the control means includes an energizing current for the resistor. Is compared with the resistance map data corresponding to the heating coil to determine the type of the heating coil.

According to a fifth aspect of the present invention, in the induction heating apparatus according to any one of the first to fourth aspects, the first connector includes a plurality of terminals, and the heating coil determining means includes a plurality of terminals. Including a short-circuit wire inserted between at least a pair of terminals among the terminals, the short-circuit wire is a short-circuit between terminals at different locations depending on the type of the heating coil.

According to a sixth aspect of the present invention, in the induction heating apparatus according to the fifth aspect, the heating coil determining means includes a relay circuit which is energized by energization via a short-circuit line.
The control means compares the excitation signal from the relay circuit with the map data of the short-circuit line position corresponding to the heating coil,
This is to determine the type of the heating coil.

According to a seventh aspect of the present invention, in the induction heating apparatus according to any one of the first to sixth aspects, the first connection line is a signal line for monitoring an operation state of the heating coil. Is included.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view showing the appearance of the first embodiment of the present invention. The same components as those described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, heating coils 1 and 2 are
It is selectively mounted on the induction heating device main body 10. The induction heating device main body 10 includes a control unit (described later), and the control unit has a function of controlling the driving of the heating coil 1 or 2 and determining the type of the heating coil 1 or 2.

From a predetermined portion (for example, both ends) of the heating coil 1 or 2, a connection line 11 is drawn out in a non-conductive state, and a connector 12 is attached to one end of the connection line 11. A connector 13 having a shape opposite to the connector 13 is detachably attached to the connector 12, and a connection line 14 is drawn from the connector 13.

One end of the connecting wire 14 is connected to the induction heating device main body 1.
The control means is connected to the control means within the range of 0, and the control means determines the type of the heating coil 1 or 2 based on a signal obtained through the connection line 14. In addition, as each of the connection lines 11 and 14, an electric wire or an optical fiber cable is used.

FIG. 2 is an enlarged sectional view showing a terminal portion of the connector 12 shown in FIG. 1. The connector 12 has a plurality of terminals 12a, 12b,. FIG.
FIG. 3 is a circuit diagram showing a specific example of the internal configuration of the device. For example, a resistor R having a different resistance value is inserted between terminals 12c and 12d according to the type of heating coil.

FIG. 4 is a block diagram showing a main part of the first embodiment of the present invention.
And a power supply 16 for supplying a current to the resistor R via the control means 15. The display means 17 is connected to the control means 15, and the display means 17 displays and outputs the result of the determination of the heating coil based on the signal processing.

Connection wire 11 drawn from the heating coil,
A connector 12 attached to one end of the connection wire 11, a connector 13 detachably attached to the connector 12, a connection wire 14 drawn from the connector 13, and a type of the heating coil are determined based on a signal via the connection wire 14. The control means 15 for performing the determination and the display means 17 for displaying the result of the determination by the control means 15 constitute a heating coil determining means.

Next, the operation of the first embodiment of the present invention will be described with reference to FIGS. First, an operator mounts, for example, two heating coils 1 and 2 on a trolley 6 according to the specification of the object 3 to be heated, and supplies power between each heating coil 1 and 2 and the induction heating device main body 10. The system is connected and the connectors 12 and 13 are connected.

Subsequently, the carriage 6 is driven in the same manner as described above.
The heating coil (e.g., heating coil 1) which is recognized as being optimal is selected and the transfer line, that is, the sled conveyor 5 is selected.
On the extension of Hereinafter, typically, the heating coil 1
The case where is selected will be described as an example.

At this time, prior to power supply to the heating coil 1, the control means 15 processes a signal obtained from the heating coil 1 via the connection line 11, the connectors 12 and 13, and the connection line 14 to perform heating. The type of the coil 1 is determined, and the determination result is displayed on the display unit 17.

Therefore, the operator can confirm whether the type (size) of the heating coil 1 actually matches the object 3 to be heated by referring to the display contents of the display means 17. If the operator recognizes that the selected heating coil is incompatible, the operator replaces another heating coil and performs a reselection process.

As a result, it is possible to prevent a coil that does not match the size of the object to be heated from being selected, and prevent overheating or underheating, thereby appropriately heating the object to be heated 3.

More specifically, in FIG. 4, the resistance value of the resistor R can be detected by supplying electricity to the resistor R through the control means 15 through the electric wire 16 in the main body 10 of the induction heating apparatus. In this case, terminals 12c and 12d at predetermined locations
Although the resistor R is inserted only between them, it may be inserted at a plurality of locations.

The control means 15 previously stores data associating each heating coil with a resistance value as a map, and compares the detected resistance value of the resistor R with the map data to determine the type of the heating coil 1. Can be specified.
The result of the determination (the type of the heating coil 1) is displayed on the display unit 17.

Although omitted in FIG. 4,
In accordance with the number of terminals of the connector 12, a current-carrying circuit similar to that shown in FIG. 4 may be provided in the induction heating device main body 10, and a resistor R may be inserted between terminals different for each heating coil. in this case,
By detecting the insertion point of the resistor R, the type of the heating coil can be specified more reliably.

A resistor R is used as an impedance element.
However, another impedance element such as a capacitor or an inductor may be used to set different circuit constants such as capacitance or inductance for each heating coil.

Embodiment 2 In the first embodiment, the resistor R having a different resistance value is inserted for each heating coil. However, a short-circuit line may be inserted at a different position (between a pair of terminals) for each heating coil.

FIG. 5 is a circuit diagram showing a main part of the second embodiment of the present invention in which a short-circuit wire is inserted between terminals of the connector 12, and FIG. 6 is a configuration showing a main part of the second embodiment of the present invention. FIG. In each drawing, the same components as those described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 5, with respect to the connector 12 mounted on one heating coil 1, a short-circuit line L1 is inserted between the pair of terminals 12e and 12f, and with respect to the connector drawn out from the other heating coil 2, A short-circuit line L2 (see broken line) is inserted between the other pair of terminals 12g and 12h. Here, one for each heating coil
Although the short-circuit lines L1 or L2 are inserted, they may be inserted at different positions.

In FIG. 6, the induction heating device main body 10
A relay circuit 20 cooperating with the control means 15 is incorporated. The relay circuit 20 includes a connection line 14 and a connector 13.
Power supply 2 for supplying power to short-circuit line L1 in connector 12 through connector
1 and a relay main body 22 which is excited by energizing the short-circuit line L1.

Here, typically, a single relay circuit 20
However, in practice, a required number of relay circuits corresponding to the number of types of heating coils are provided in parallel. Further, the control means 15 stores in advance, as a map, data in which each heating coil is associated with the insertion position of the short-circuit wire.

Therefore, the control means 15 receives the excitation signal D from the relay main body 22, recognizes the short-circuit line position corresponding to the relay main body 22, and compares the detected short-circuit line position with the map data. Then, the type of the heating coil is specified, and the determination result is displayed on the display unit 17.

As described above, by discriminating the type of each heating coil from the position of the short-circuit line attached to the terminal of the connector 12, it is possible to prevent a coil incompatible with the size of the object to be heated 3 from being selected. it can. Further, since the above-mentioned resistor R is not required, the cost can be further reduced.

Embodiment 3 FIG. In the first and second embodiments, the use of the terminal in the connector 12 into which the resistor R or the short-circuit lines L1 and L2 are not inserted is not particularly described. However, the signal for monitoring the operation state of the heating coil is not described. It may be used as a line.

Generally, a monitoring signal line is drawn out of a predetermined position of the heating coil in a non-conductive state, and is connected to the induction heating device main body 10 through a connector similar to the connector 12.
, The operating state is monitored, but the monitor connector includes unused terminals.

Therefore, in the connector 12, the use of the terminals not used for insertion of the resistor R, the short-circuit lines L1 and L2, etc. as the monitor signal line can be achieved by adding the resistor R and the short-circuit to the surplus terminals of the monitor connector. This is synonymous with inserting the lines L1 and L2, and the connector 12 can be used also as a regular monitor connector.

In this case, the connection line 11 is connected to the heating coil.
In addition, since it is not necessary to newly install the connector 12, the cost does not increase.

[0048]

As described above, according to the first aspect of the present invention, a plurality of heating coils having different sizes from each other for induction heating an object to be heated and a size of the object to be heated among the plurality of heating coils are reduced. A heating coil selecting means for selecting a suitable one and positioning it on the induction heating device main body, a transfer means for transferring an object to be heated into the heating coil, and a type of the heating coil mounted on the induction heating device main body. Heating coil discriminating means for discriminating, wherein the heating coil discriminating means is provided with a first coil pulled out of a predetermined position of the heating coil in a non-conductive state
And a first connection line attached to one end of the first connection line.
, A second connector detachably attached to the first connector, a second connection line drawn from the second connector, and a signal obtained through the second connection line. Since it includes the control means for determining the type of the heating coil and the display means for displaying the determination result of the control means, there is an effect that an induction heating device in which application of a heating coil that is incompatible with the object to be heated is reliably prevented can be obtained. .

According to a second aspect of the present invention, in the first aspect, the first connector includes a plurality of terminals, and the heating coil determining means is inserted between at least a pair of terminals among the plurality of terminals. Since the impedance element has different circuit constants depending on the type of the heating coil, an effect is obtained in that an induction heating device in which application of a heating coil that is incompatible with the object to be heated is reliably prevented is obtained.

According to a third aspect of the present invention, in the second aspect, the impedance element is formed of a resistor having a different resistance value depending on the type of the heating coil.
There is an effect that an induction heating device in which application of a heating coil that is incompatible with the object to be heated is reliably prevented can be obtained.

According to a fourth aspect of the present invention, in the third aspect, the heating coil determining means includes an energizing circuit for energizing the resistor, and the control means detects the energizing current from the resistor. The type of heating coil is determined by comparing the resistance value of the heating coil with the map data of the resistance value corresponding to the heating coil, so that an induction heating device that reliably prevents the application of a heating coil that is incompatible with the object to be heated can be obtained. Has the effect.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the first connector includes a plurality of terminals, and the heating coil determining means includes a plurality of terminals. A short-circuit wire inserted between at least one pair of terminals.The short-circuit wire short-circuits terminals at different locations according to the type of the heating coil. There is an effect that an induction heating device in which application of the coil is reliably prevented can be obtained.

According to a sixth aspect of the present invention, in the fifth aspect, the heating coil determining means includes a relay circuit which is energized by energization through a short-circuit line, and the control means includes:
Since the type of the heating coil is determined by comparing the excitation signal from the relay circuit with the map data of the short-circuit line position corresponding to the heating coil, the application of a heating coil that is incompatible with the object to be heated is reliably prevented. There is an effect that an induction heating device can be obtained.

According to a seventh aspect of the present invention, in the induction heating apparatus according to any one of the first to sixth aspects, the first connection line is a signal line for monitoring an operation state of the heating coil. Therefore, the first connection line can be used also as a normal signal line, and there is an effect that an induction heating device that realizes a cost reduction can be obtained.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a terminal portion of the connector in FIG. 1;

FIG. 3 is a circuit diagram showing a specific configuration example of the inside of the connector in FIG. 1;

FIG. 4 is a configuration diagram showing a main part of the first embodiment of the present invention.

FIG. 5 is a circuit diagram showing a specific configuration example inside a connector according to a second embodiment of the present invention.

FIG. 6 is a configuration diagram showing a main part of a second embodiment of the present invention.

FIG. 7 is a plan view showing a conventional induction heating device.

[Explanation of symbols]

1, 2 heating coil, 3 heated object, 5 sld conveyor, 7, 8 rail, 9 hydraulic cylinder, 10 induction heating device main body, 11 first connection line, 12 first connector, 12a to 12i terminal, 13th 2 connectors,
14 second connection line, 15 control means, 16 power supply, 1
7 display means, 20 relay circuit, D excitation signal, L
1, L2 short-circuit line, R resistor.

Claims (7)

[Claims] 1. A plurality of heating coils different in size from each other for induction heating an object to be heated, and a coil suitable for the size of the object to be heated among the plurality of heating coils is selected to be mounted on an induction heating apparatus main body. A heating coil selecting unit for positioning the heating object, a transferring unit for transferring the object to be heated into the heating coil, and a heating coil determining unit for determining a type of the heating coil mounted on the induction heating device main body. The heating coil discriminating means comprises: a first connection line drawn out of a predetermined position of the heating coil in a non-conductive state; a first connector attached to one end of the first connection line; A second connector detachably attached to the first connector, a second connection line drawn from the second connector, and a signal obtained via the second connection line. An induction heating device comprising: a control unit that determines a type of the heating coil by using the control unit; and a display unit that displays a determination result of the control unit. 2. The method according to claim 1, wherein the first connector includes a plurality of terminals, the heating coil determining unit includes an impedance element inserted between at least a pair of terminals of the plurality of terminals, 2. The method according to claim 1, wherein the circuit has different circuit constants depending on the type of the heating coil.
2. The induction heating device according to claim 1. 3. The induction heating apparatus according to claim 2, wherein the impedance element comprises a resistor having a different resistance value depending on the type of the heating coil. 4. The heating coil discriminating means includes an energizing circuit for energizing the resistor, and the control means corresponds to a resistance value detected from an energizing current of the resistor and the heating coil. 4. The induction heating apparatus according to claim 3, wherein the type of the heating coil is determined by comparing the resistance value with map data of a resistance value. 5. The first connector includes a plurality of terminals, the heating coil determining unit includes a short-circuit line inserted between at least a pair of terminals of the plurality of terminals, The induction heating device according to any one of claims 1 to 4, wherein terminals at different locations are short-circuited according to the type of the heating coil. 6. The heating coil discriminating means includes a relay circuit which is energized by energization via the short-circuit wire, and the control means includes an exciting signal from the relay circuit and a short-circuit wire corresponding to the heating coil. 6. The induction heating apparatus according to claim 5, wherein the type of the heating coil is determined by comparing the position with map data. 7. The induction heating apparatus according to claim 1, wherein the first connection line includes a signal line for monitoring an operation state of the heating coil. .