JPS6122435B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an induction heating device for induction heating an object to be heated, and more particularly to an induction heating device for induction heating a billet for forging, which is equipped with a thyristor type high frequency inverter as a high frequency power source.

FIG. 1 is an electrical wiring diagram showing a general induction heating device. In the figure, the power receiving board 1 is, for example, 50/60
A high-voltage switchgear 101 to which a three-phase high-voltage power supply with a commercial frequency of Hz and 3.3/5.6 KV is applied, and which switches and closes the load.
and a power fuse 102 for short-circuit protection on the load side. The transformer 2 is connected to the power receiving board 1 and steps down the applied voltage to a predetermined voltage. The high frequency inverter 3 is connected to the transformer 2, and the applied AC power is exchanged to DC power by a three-phase bridge-connected thyristor 301, and then a pulsating current smoothing reactor 302
After that, single-phase high-frequency AC power is obtained by the thyristor 303 connected in parallel with the bridge. Power capacitor 4 for high frequency inverter 3
and the induction heating coil 5 are connected in parallel, and the resonant frequency of this parallel resonant circuit is selected to be the frequency of the high frequency AC output.

That is, three-phase commercial frequency power is applied to the high frequency inverter 3 via the power receiving board 1 and the transformer 2,
By obtaining single-phase high-frequency AC power according to the resonant frequency of a parallel resonant circuit consisting of a power capacitor 4 and an induction heating coil 5 using a high-frequency inverter 3, and applying this single-phase high-frequency AC power to the induction heating coil 5, The object to be heated fed into the induction heating coil 5 is heated by induction. Figure 2 shows the feeding mechanism that feeds the object to be heated into the heating space of the induction heating coil.
vinegar.

FIG. 2 is a side view showing a general feeding mechanism. In the figure, parts corresponding to those in FIG. 1 are given corresponding symbols. The same applies to the following drawings.
In FIG. 2, the feeding mechanism 6 includes a slat conveyor 601 that conveys the heated object 7, which is a billet for forging, a pinch roller 602 that feeds the heated object 7 into the induction heating coil 5, and a pinch roller 60.
2 and an electric motor 603 that drives the motor.

In order to assemble an induction heating device with such a configuration, in the past, each component was not unified as a whole, but was created separately and assembled together, which had the disadvantage of making the device very large. Ta. Furthermore, even if each component is miniaturized separately without unifying them, space is required on the front, back, left, and right sides of each component to operate each component, so this does not contribute to the overall miniaturization of the device. I was bored. Furthermore, due to spatial constraints between each component, operation becomes inefficient as the distance between each component increases. Furthermore, as the size of the device increases, transportation of the device becomes complicated.

This invention has been made in view of the drawbacks of the prior art, and each component device is unified and the device is made into an integrated structure. The present invention will be explained below with reference to the drawings.

FIG. 3 is a configuration diagram showing one embodiment of the induction heating device according to the present invention, FIG. 3a is a plan view, and FIG.
Figure b is a front view, and Figure 3c is a side view. In FIG. 3, a power receiving panel 1, a transformer 2, and a high frequency inverter 3 are installed in a row on one side end of a board 8, forming a power supply device 9. These power receiving board 1, transformer 2, and high frequency inverter 3 are housed in a container box having the same height and width. At the other end of the substrate 8, there is a power capacitor 4 housed in a matching box 4', an induction heating coil 5, and a feeding mechanism 6.
An operation box 10 in which an operation device is installed is installed in a line, and a feed mechanism 6 and an induction heating coil 5 are installed above the power capacitor 4 and the operation box 10. It is installed on the inlet side of the heating coil 5. These power capacitors 4
A heating device 11 is composed of an operation box 10, a feeding mechanism 6, and an induction heating coil 5. The matching box 4' and the operation box 10 have the same height and width, and a space 1 of about 600 mm is provided between the power supply device 9 and the heating device 11. Heating device 1
A roller 12 is provided at the bottom of the heating device 1.
The space 1 can be adjusted by moving the space 1. Further, a rotation fulcrum 13 is provided at the outlet side end of the induction heating coil 5, as shown in FIG.
The feed mechanism 6 and the induction heating coil 5 are configured to be rotatable in the direction of arrow A shown in FIG.

That is, commercial frequency AC power is applied to the power receiving panel 1, and after being lowered to a predetermined voltage by the transformer 2, the high frequency inverter 3 obtains single phase high frequency single phase AC power. This high-frequency single-phase AC power is applied to a parallel resonant circuit of the power capacitor 4 and the induction heating coil 5, and is sent to the induction heating coil 5 by the feeding mechanism 6.
The object to be heated 7 sent in by the heating member is heated by induction. Note that the induction heating coil 5 and the feeding mechanism 6 are operated by operating equipment housed in an operating box 10.

When the heated object 7 is a forging billet, the forging billet is cut at the outlet end of the induction heating coil 5, and the cut surface is approximately It varies by 90±5°. In order to stably feed this forging billet, it is preferable that the feeding mechanism 6 and the induction heating coil 5 be slightly inclined with respect to the horizontal plane, with the inlet side being higher and the outlet side being lower. For this reason, the rotation fulcrum 1
3 to the entrance side in the direction of the arrow A shown in FIG. Furthermore, when transporting the apparatus, the heating apparatus 11 is moved by the rollers 12 and the power supply apparatus 9 and the heating apparatus 11 are brought into close contact with each other, thereby making it easier to transport the apparatus. Furthermore, since the device is integrated, the wiring distance of control cables between each component device is shortened, and accidents such as incorrect wiring of control cables are also reduced.

As described above, according to the present invention, each device constituting the power supply device and the heating device as well as the connection wires connecting each device are mounted on a single board. Instead of having to transport each piece of equipment separately to the installation site and assemble it on-site, it can now be assembled at the factory and transported to the site as is, which has the effect of significantly shortening the installation period on-site.

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[Brief explanation of the drawing]

FIG. 1 is an electrical wiring diagram showing a general induction heating device. FIG. 2 is a side view showing a general feeding mechanism. FIG. 3 is a block diagram showing an embodiment of the induction heating device according to the present invention, in which FIG. 3a is a plan view, FIG. 3b is a front view, and FIG. 3c is a side view. In the figures, corresponding parts in each figure are given corresponding symbols. 1 is a power receiving board, 2 is a transformer, 3 is a high frequency inverter, 4 is a power capacitor, 5 is an induction heating coil, and 6 is a A feeding mechanism, 7 an object to be heated, 8 a substrate, 9 a power supply device, 10 an operation box, 11 a heating device, 12 a roller, and 13 a rotation fulcrum. 〓〓〓〓〓

Claims (1)

[Claims] 1 A power receiving board to which a commercial frequency three-phase AC power supply is applied and has a load switching mechanism; a transformer connected to the power receiving board to transform the applied voltage into a predetermined output voltage; and a transformer connected to the transformer to convert the input three-phase AC power into DC. A power supply device comprising a high frequency inverter that converts the power into single-phase high frequency power after converting it to electric power, an induction heating coil that is connected to the high frequency inverter and heats an object to be heated by induction, and is connected in parallel to the induction heating coil to form a parallel resonant circuit. A power capacitor for heating, a feeding mechanism for feeding the heated object into the induction heating coil and taking out the heated object heated to a predetermined temperature from the induction heating coil, and an operation device for the induction heating coil and the feeding mechanism are built-in. An induction heating device comprising a heating device comprising an operation box, a connection line connecting the functions of the power supply device and the heating device, and a single base on which all of the power supply device and the heating device are placed.