JPH11102777A - Continuous induction heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous induction heating apparatus, capable of easily carrying a tube to be heated after being heated and continuous heating, corresponding to an impedance change without requiring a dummy pipe to be replaced according to size of the tube heated. SOLUTION: An electromagnetic induction heating coil 7 made orthogonal with respect to a tube axial direction of a plurality of heated tubes 1 with their ends being arranged in order, without being laminated in planar shape, and disposed so as to surround the peripheral direction of all the heated tubes 1, when the heated tube 1 is heated continuously up to its tube axial direction continuously, while being horizontally moved in the tube axial direction of all the heated tubes 1, has a step in the vertical direction of the heated tube 1, and a dummy pipe 3 whose end is set at the same position in the horizontal direction at the end of heated tube 1 is disposed so as not to be superposed on the heated tube 1 in the vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous induction heating apparatus capable of continuously and uniformly heating a heated pipe end using a dummy pipe.

[0002]

2. Description of the Related Art When an object to be heated, such as a finite length steel tube, is continuously heated by an induction heating device over the entire length of the tube in the axial direction (longitudinal direction), the end of the tube (end of the double tube) is connected to other portions. And the predetermined temperature cannot be obtained. The reason is as follows.

[0003] In the case where a finite length of a heated pipe is continuously heated by an induction heating device over the entire length, a situation in which the end of the heated pipe is relatively moving on the inner peripheral side of the electromagnetic induction heating coil is considered. When the induction heating coil disposed on the outer peripheral side of the heated pipe moves toward the end of the heated pipe, the amount of the heated pipe changes sequentially with the elapse of the moving time, and finally the heated pipe is heated. A condition occurs in which the tube runs out. In this case, the induction heating coil oscillates with no load, the impedance becomes high when viewed from the power supply that excites the induction heating coil, current does not easily flow, and only the voltage rises sharply, resulting in overvoltage. For this reason, it becomes impossible to continuously oscillate from the aspect of protection of the induction heating device, and the power must be cut off immediately before passing through the end of the heated pipe.

Conventionally, in order to eliminate such a problem,
There are a first example, a second example, and a third example described below. <First Example> A method of arranging dummy pipes at both ends of a heated pipe and heating them by an electromagnetic induction heating coil is known from Japanese Patent Application Laid-Open No. 59-189585. In this method, as shown in FIG. 6, at both ends of a heated pipe 1 such as a steel pipe to be heated by induction heating, the same inner diameter and the same outer diameter as the heated pipe 1 are arranged on a concentric extension of the heated pipe 1. The dummy pipes 2 and 3 having the dimensions are fixed by a fixing member (not shown), wound around the outer peripheral surface of the tube 1 to be heated, and the electromagnetic induction heating coils 6 movably supported by the carts 4 and 5, respectively.
7 is provided. And the power supply device 10 which supplies electric power to the electromagnetic induction heating coils 6 and 7 simultaneously is provided.

In such a configuration, by supplying AC power from the power supply device 10 to the electromagnetic induction heating coils 6 and 7, the alternating magnetic flux generated from the electromagnetic induction heating coils 6 and 7 generates the alternating magnetic flux. No leakage magnetic flux is generated at the ends of the pipes 1, and both ends of the pipe 1 to be heated are guided to the dummy pipes 2 and 3 adjacent thereto, and pass through the dummy pipes 2 and 3. The heated tube 1 is heated by Joule heat caused by the eddy current generated in the tube. With such a configuration, the end of the heated pipe can be heated evenly similarly to the center of the heated pipe.

<Second Example> The configuration of this example is a case where the dummy pipes 2 and 3 of FIG. 6 are not provided, and a power supply pattern as shown in FIG. It is supposed to be. This power supply pattern supplies a rated power value P when the electromagnetic induction heating coils 6 and 7 are in a stationary state in the central portion of the tube 1 to be heated, and the electromagnetic induction heating coil 6 is supplied from the central portion to the end of the tube. , 7 move from the rated power value P to the lowest power value P0 ', and thereafter, from the lowest power value P0' to the highest power value at the distance L1 from the pipe end of the heated pipe 1 to the center of the pipe. The power value is gradually increased to P0 ''.

In such a configuration, by supplying AC power to the electromagnetic induction heating coils 6 and 7 from the power supply device 10, the alternating magnetic flux generated from the electromagnetic induction heating coils 6 and 7 is reduced. The heated tube 1 is heated by Joule heat due to eddy current generated in the heated tube 1 as a result.

With such a configuration, the end of the heated pipe can be heated evenly similarly to the center of the heated pipe. <Third example> A third example is disclosed in Japanese Patent Application Laid-Open No. 1-172521, in which the relative speed is reduced when the end of the heated tube relatively passes through the inside of the heating coil. By increasing the input power per unit amount of the heated pipe,
This technology eliminates insufficient temperature rise at the center of the pipe.

[0009]

However, in the first, second and third examples of the prior art described above,
There are the following problems. That is, in the first example,
(1) Since the dummy pipes 2 and 3 are arranged concentrically with respect to the heated pipe 1, it is difficult to transport the heated pipe 1 after heating. (2) Since the dummy pipes 2 and 3 have the same inner diameter and the same outer diameter as the heated pipe 1, it is necessary to replace the dummy pipe according to the heated pipe 1 having a different size.

In the second example, since the impedance at the end of the heated tube 1 is higher than that at the center of the tube, a constant power controller (AP) for supplying electric power to the induction heating coil 6 is used.
R: automatic power regulator). The reason for this is that the voltage may become an overvoltage prior to the current, and the temperature drop at the tube end of the heated tube 1 is as large as T0 in FIG. This is larger than the temperature of the part).

Further, the third example has the following problem. FIG. 8 is a diagram for explaining this, and FIG. 8A is a diagram showing a relationship between the heated tube 1 and the induction heating coil 6.
(B) is a diagram showing the state of presence or absence of heat generation of the induction heating coil 6, (c) is a diagram showing the moving speed of the induction heating coil 6, and (d) is a diagram showing a change in the temperature at which the heated tube 1 reaches the heating target. FIG.

In the third example, as apparent from FIG.
By lowering the relative speed when the tube end 1a of the heated tube 1 relatively passes through the induction heating coil 6,
Even if the input power per unit amount of the heated tube 1 is increased, no-load oscillation is still not possible, and the temperature rise becomes insufficient near the tube end 1a as shown in (d).

In the third example, when the relative speed is reduced, the portion of the heating coil that is somewhat inside from the tube end 1a within the range of influence is increased more than necessary due to the reduced speed. A portion to be heated occurs.

An object of the present invention is to make it possible to easily transport a heated pipe after heating it, to replace a dummy pipe according to the size of the heated pipe, and to enable continuous heating corresponding to impedance change. Further, a continuous induction heating apparatus capable of avoiding a phenomenon in which a current caused by no-load oscillation generated when a pipe end portion of a heated pipe relatively passes through a heating coil is unlikely to flow and only a voltage rises sharply can be avoided. Is to do.

[0015]

In order to achieve the above object, an invention corresponding to claim 1 is provided so that a plurality of heated tubes whose ends are aligned without being stacked in a plane are perpendicular to the tube axis direction. While moving the annular electromagnetic induction heating coil arranged so as to surround the peripheral direction of all the heated pipes horizontally in the axial direction of all the heated pipes, moving the heated pipes in the axial direction thereof. When heating up to the end of the tube continuously, the heated tube has a step in the vertical direction, and is located in the turn of the electromagnetic induction heating coil. This is a continuous induction heating apparatus in which a dummy pipe whose end is positioned at the same position in the horizontal direction is arranged so as not to overlap the pipe to be heated in the vertical direction.

According to the first aspect of the present invention, the current due to no-load oscillation generated when the tube end of the heated tube relatively passes through the electromagnetic induction heating coil hardly flows, and only the voltage is sharply increased. By avoiding the phenomenon of rising, and oscillating continuously after passing through the tube end, the oscillation time for heating can be set at the tube end as well as the center of the tube, and the tube end has a sufficient temperature Ascending is obtained and uniform heating can be performed up to the pipe end.

Further, according to the invention corresponding to claim 1,
Processing can be performed without changing the relative speed between the heated tube and the heating coil, so that it is possible to avoid excessive heating due to excessive input power due to the speed reduction of the prior art, and to even the end of the tube. Can be heated.

Further, according to the first aspect of the present invention, the heated pipe and the dummy pipe are arranged so as to have a step, so that the heated pipe can be easily transported after heating during continuous operation.

According to a second aspect of the present invention, there is provided a continuous induction heating apparatus according to the first aspect, wherein the electromagnetic induction heating is performed by an output of one of an automatic power regulator and an automatic voltage regulator. A power supply device capable of changing a supply pattern of power supplied to the coil, wherein the power supply pattern supplied by the power supply device is the automatic power supply between the central portion of the heated pipe and the vicinity of the pipe end; Control by the output of the regulator, from the vicinity of the pipe end to the end of the dummy pipe is controlled by the output of the automatic voltage regulator, and when the dummy pipe is a specific one, the heated pipe This is a continuous induction heating device configured to correct a supply pattern of power supplied by the power supply device according to a change.

According to the second aspect of the present invention, even if the pipes to be heated have different inner and outer diameters, the supply pattern of the power supplied by the power supply device is corrected with the change of the pipes to be heated. Therefore, there is no need to change the dummy pipe at all.

According to a third aspect of the present invention, there is provided a continuous induction heating apparatus according to the first aspect, further comprising: a power supply device for supplying power to the electromagnetic induction heating coil; Storage means for storing a supply pattern of power to be supplied to the electromagnetic induction heating coil by the power supply device according to the value of the inner and outer diameters, and the value of the inner and outer diameters of the heated pipe can be designated; Correspondingly, there is provided a continuous induction heating apparatus including a heated pipe inner / outer diameter dimension specifying means for reading a power supply pattern from the storage means and setting the power supply pattern of the power supply apparatus as a power supply pattern.

According to the third aspect of the present invention, even if the pipes to be heated have different inner and outer diameters, the power supply pattern supplied by the power supply device with the change of the pipes to be heated automatically changes. Since the power supply pattern is a power supply pattern read from the storage device stored in advance in the storage device, there is no need to change the dummy pipe at all.

In order to achieve the above object, the invention according to claim 4 is characterized in that a plurality of tubes to be heated are arranged without being stacked in a plane and perpendicular to the tube axis direction of a plurality of tubes whose ends are aligned. While moving an annular electromagnetic induction heating coil arranged so as to surround the pipe in the horizontal direction in the pipe axis direction of all the pipes to be heated, the pipe to be heated is continuously moved in the pipe axis direction. At the time of heating to the end, a dummy pipe having the same end in the horizontal direction at the end of the tube to be heated is positioned perpendicular to the tube to be heated so that the dummy pipe is located within the turn of the electromagnetic induction heating coil. A power supply device that is arranged so as not to overlap in the direction and that can change a supply pattern of power to be supplied to the electromagnetic induction heating coil by an output of an automatic power regulator and an automatic voltage regulator, The power supplied by the power supply The supply pattern is controlled by the output of the automatic power regulator between the center of the heated pipe and the vicinity of the end of the pipe, and the automatic voltage is controlled between the vicinity of the pipe end and the end of the dummy pipe. Controlled by the output of the regulator,
In the continuous induction heating apparatus, when the dummy pipe is a specific one, a supply pattern of power supplied by the power supply apparatus is corrected in accordance with a change in the pipe to be heated.

According to the fourth aspect of the present invention, even if the pipes to be heated have different inner and outer diameters, the power supply pattern supplied by the power supply device is corrected with the change of the pipes to be heated. Therefore, there is no need to change the dummy pipe at all.

In order to achieve the above object, the invention according to claim 5 is characterized in that all the heated tubes are arranged perpendicularly to the tube axis direction of a plurality of heated tubes whose ends are aligned without being stacked in a plane. While moving an annular electromagnetic induction heating coil arranged so as to surround the pipe in the horizontal direction in the pipe axis direction of all the pipes to be heated, the pipe to be heated is continuously moved in the pipe axis direction. At the time of heating to the end, a dummy pipe having the same end in the horizontal direction at the end of the tube to be heated is positioned perpendicular to the tube to be heated so that the dummy pipe is located within the turn of the electromagnetic induction heating coil. Arranged so as not to overlap in the direction, a power supply device for supplying power to the electromagnetic induction heating coil,
Storage means for storing a supply pattern of power to be supplied to the electromagnetic induction heating coil by the power supply device according to the value of the inner and outer diameters of the heated pipe, and the value of the inner and outer diameters of the heated pipe can be designated A continuous induction heating apparatus including a heated pipe inner and outer diameter dimension specifying means for reading a power supply pattern from the storage means and making the power supply pattern of the power supply apparatus corresponding to the designation.

According to the fifth aspect of the present invention, even if the pipe to be heated is changed to one having different inner and outer diameters, the power supply pattern supplied by the power supply device with the change of the pipe to be heated is automatically changed. Since the power supply pattern is a power supply pattern read from the storage device stored in advance in the storage device, there is no need to change the dummy pipe at all.

According to a sixth aspect of the present invention, there is provided a continuous induction heating apparatus according to any one of the first to fifth aspects, wherein the dummy pipe has a supply / drain pipe of a cooling water circulation type cooling apparatus. Is a continuous induction heating device connected so as to be able to communicate with each other.

According to the sixth aspect of the present invention, since the dummy pipe is cooled by the circulation of the cooling water, it is possible to withstand continuous operation. To achieve the above objective,
The invention corresponding to claim 7 is characterized in that the dummy pipe is transported by a mechanism that slides in the pipe axis direction according to a change in the length of the pipe to be heated in the pipe axis direction. A continuous induction heating apparatus according to any one of claims 1 to 6.

According to the seventh aspect of the present invention, the dummy pipe is provided with a mechanism for sliding the dummy pipe in the pipe length direction in accordance with the change in the length of the pipe to be heated. The above-described method can be applied to the change in the height.

[0030]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view for explaining the outline of the continuous induction heating apparatus of the present invention. Specifically, FIG. 1 (a) shows an inner surface for manufacturing a vinyl chloride-lined steel pipe, in which a plurality of steel pipes or the like are covered. A vinyl chloride tube (not shown) is inserted into the inner peripheral surface of the heating tube 1, and two annular induction heating coils (only one is shown in the figure) penetrating the heated tube 1 and the vinyl chloride tube by an induction heating device. 7) are moved from the central portion in the longitudinal direction of the pipe toward the ends of the two pipes, and the heated pipe 1 is continuously heated.

<First Embodiment> FIG. 2 is a side view for explaining a first embodiment of the continuous induction heating apparatus of FIG. That is, the annular electromagnetic induction is arranged so as to be orthogonal to the tube axis direction of the plurality of heated tubes 1 whose ends are aligned without being stacked in a plane and to surround the peripheral direction of all the heated tubes 1. When the heating coils 6 and 7 are horizontally moved in the direction of the tube axis of all the tubes 1 to be heated while the tube 1 is continuously heated to the tube end in the direction of the tube axis, A step for fixing both ends to the both ends of the heated tube 1 in the horizontal direction so as to have a step in the vertical direction with respect to the heating tube 1 and to be positioned within the turns of the electromagnetic induction heating coils 6 and 7 respectively. The dummy pipes 8 and 9 supported by the fixing member are arranged so as not to overlap the heated pipe 1 in the vertical direction.

A water supply / drain pipe 13 of a cooling water circulation type cooling device (not shown) is communicably connected to the dummy pipe 8, and a water supply / drainage pipe 14 of a cooling water circulation type cooling device (not shown) is communicable with the dummy pipe 9. And is connected to a cooling water circulation type cooling device so as to withstand continuous operation.

Thus, the tube end of the heated tube 1 is
By heating the dummy pipe 3 continuously, the pipe end of the pipe to be heated 1 can be heated in the same manner as the portions other than the pipe end. In the above-described embodiment of the present invention, the following problems exist in performing more severe control. That is, the tube end of the heated tube 1 has a high impedance as viewed from the power source as shown in FIG. 1 (b), and as a result, is continuously controlled by an automatic power regulator (APR: constant power controller). Doing so may cause the voltage to precede the power and become an overvoltage.

Therefore, in the embodiment of the present invention, not only the above-described automatic power regulator 10 but also an automatic voltage regulator (AVR: constant voltage controller) 20 is provided as a power supply device, and both are switched. Switching means 30 is provided as possible, and FIG.
By setting the heating power pattern so that the voltage reference is raised in accordance with the rise of the impedance in FIG. 1B as in (c), continuous heating corresponding to the impedance change can be continued. This is clear from the experimental results. The end of the heated pipe 1 has many variations in impedance due to the size difference between the dummy pipe and the heated pipe, and the automatic power regulator 10 has a leading voltage, and the control is performed. Although difficult, the automatic voltage regulator 20 can control stably.

The heating power pattern shown in FIG. 1 (c) or FIG. 3 (a) is slightly different depending on the inner and outer diameters of the heated tube 1, so that heating according to the inner and outer diameters of the heated tube is performed. A power pattern is obtained by an experiment or the like, and is obtained, for example, by a storage device (not shown) provided in the switching unit 30.
The heating power pattern stored in advance is specified by specifying the inner and outer diameter dimensions of the tube to be heated, for example, by the inner and outer diameter specifying means (not shown) provided in the switching means 30. By doing so, the pattern of the corresponding heating power can be read.

With this configuration, it is difficult for a current to flow due to no-load oscillation generated when the tube end of the tube to be heated 1 relatively passes through the inside of the heating coil 7, and only the voltage rises sharply. By avoiding the phenomenon and oscillating continuously after passing through the tube end, the oscillation time for heating can be set at the tube end as well as the center of the tube, and a sufficient temperature rise can be obtained at the tube end It can be heated uniformly to the pipe end. The heated tube 1
Can be performed without changing the relative speed of the heating coil 7 and the heating coil 7, so that it is possible to avoid the occurrence of overheating due to an increase in input power more than necessary due to the speed reduction according to the third conventional example,
It can be heated uniformly to the pipe end.

On the other hand, the power supply pattern shown in FIG.
Is stationary, the automatic power regulator 10 supplies the rated power value P. During a distance L2 in which the electromagnetic induction heating coils 6 and 7 move from the center to the tube end, the rated power value P The power is gradually reduced to the minimum power value P0. Thereafter, at a distance L1 from the pipe end to the center of the pipe to be heated and a distance L3 which is one point of the dummy pipes 8 and 9 from the pipe end, the voltage is switched by the switching means 30 to the automatic voltage regulator 20. The maximum voltage V is gradually increased from the rating.

As a result, as shown in FIG. 3 (b), the temperature drop at the end of the pipe shaft end of the pipe 1 to be heated is smaller than t0 and T0 of the conventional continuous induction heating apparatus. Heating can be continued without interrupting the power supply just before the end. As a result, the tube end of the heated tube 1 and the dummy pipe are continuously heated, and the tube end of the heated tube 1 can be heated similarly to the other portions.

Further, the heated pipe 1 is provided by the inner and outer diameter dimension specifying means.
By designating the inner and outer diameter dimensions of, the heating power pattern corresponding to the designation is read from the storage device, and the power of the heating power pattern is supplied to the electromagnetic induction heating coils 6 and 7. The dummy pipe 3 may be fixed without any replacement.

Further, the heated pipe 1 and the dummy pipes 8, 9
Are arranged with a step difference therebetween, so that the heated pipe 1 can be easily transported after heating during continuous operation. <Second
Embodiment> In the above embodiment, the heated pipe 1 and the dummy pipes 3, 8 and 9 are arranged so as to have a step, and the supply pattern of the electric power supplied to the electromagnetic induction heating coils 6 and 7 Was corrected by switching the outputs of the automatic power regulator and the automatic voltage regulator. However, the correction of the power supply pattern is performed by the step difference between the heated pipe 1 and the dummy pipes 3, 8, and 9. Does not exist and is arranged on a concentric extension line, as in the above-described embodiment,
It is not necessary to change the dummy pipe at all even if the pipes to be heated have different inner and outer diameters.

<Third Embodiment> FIG. 4 is a view for explaining a third embodiment, in which the dummy pipe 3 of the above-described embodiment is changed in accordance with a change in the length of the pipe 1 to be heated in the pipe axis direction. This embodiment differs from the above-described embodiment only in that it is configured to be placed and supported by a mechanism 40 that slides in the direction of the tube axis, for example, a cart with casters, and can be transported. In this case, the height of the dummy pipe 3 is higher than the pipe to be heated 1 (the dummy pipe 3 whose end is located at the same position in the horizontal direction at the end of the pipe to be heated 1 overlaps the pipe 1 to be heated in the vertical direction. Needless to say, they are arranged so as not to occur.

FIG. 4A shows a case where the length of the dummy pipe 3 in the pipe axis direction is all constant, that is, a case of a fixed length pipe. FIG. 4B shows the length of the dummy pipe 3 in the pipe axis direction. Are different from each other, that is, a case for a non-standard-size tube.

As shown in FIG. 4, a mechanism 40 is provided which slides in the tube axis direction in accordance with a change in the length of the tube 1 to be heated, and the dummy pipe 3 is placed and supported by this mechanism 40. For a change in the length of the heating tube 1 in the tube axis direction,
There is an effect that a method similar to that of the above-described embodiment can be applied.

FIGS. 5A and 5B are diagrams for explaining the operation and effect of the embodiment of FIG. 4. FIG. 5A is a diagram showing the relationship between the tube to be heated 1 and the induction heating coil 6, and FIG. It is a figure which shows the state of heat generation | occurrence | production of the coil 6, (c) is a figure which shows the moving speed of the induction heating coil 6, and (d) is a figure which shows the change of the attainment temperature of the tube 1 to be heated.

From this, the heated tube 1 and the heating coil 7
Can be processed without changing the relative speed of
As a result, it is possible to avoid the occurrence of overheating due to an increase in input power more than necessary due to the speed reduction in the example, and to uniformly heat the pipe end.

[0046]

According to the present invention described above, the heated pipe can be easily transported after being heated, the dummy pipe does not need to be replaced according to the size of the heated pipe, and the dummy pipe can cope with the impedance change. Continuous heating is possible, and it is possible to avoid the phenomenon that the current at the no-load oscillation that occurs when the tube end of the heated tube relatively passes through the heating coil is hard to flow and only the voltage rises sharply. An induction heating device can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a schematic configuration of a continuous induction heating apparatus according to the present invention.

FIG. 2 is a side view for explaining a first embodiment of the continuous induction heating apparatus of FIG. 1;

FIG. 3 is a diagram for explaining the operation and effect of the continuous induction heating device of FIG. 2;

FIG. 4 is a diagram for explaining a schematic configuration of a third embodiment of the continuous induction heating device of the present invention.

FIG. 5 is a diagram for explaining the operation and effect of the embodiment of FIG. 4;

FIG. 6 is a diagram for explaining a schematic configuration of an example of a conventional continuous induction heating device.

FIG. 7 is a diagram for explaining a problem of the continuous induction heating device of FIG. 6;

FIG. 8 is a view for explaining a schematic configuration of another example of the conventional continuous induction heating apparatus and a problem thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Heated pipe 2, 3 ... Dummy pipe 4, 5 ... Dolly 6, 7 ... Electromagnetic induction heating coil 8, 9 ... Dummy pipe 11, 12 ... Fixed member 13, 14 ... Water supply / drainage pipe 40 of cooling water circulation type cooling device 40 … A mechanism to slide the dummy pipe

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Eiji Ushijima, 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Inside Nihon Kokan Co., Ltd. (72) Toshihiro Morisaki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Honko Co., Ltd.

Claims (7)

[Claims] 1. An annular electromagnetic member arranged so as to be orthogonal to a tube axis direction of a plurality of heated tubes whose ends are aligned without being stacked in a plane and to surround a peripheral direction of all the heated tubes. When heating the heated tube continuously to its tube end in the tube axis direction while horizontally moving the induction heating coil in the tube axis direction of all the heated tubes, the heating tube is perpendicular to the heated tube. A dummy pipe having an end in the same direction in the horizontal direction at the end of the heated tube so as to have a step in the direction and positioned within the turn of the electromagnetic induction heating coil in a direction perpendicular to the heated tube. A continuous induction heating apparatus characterized by being arranged so as not to overlap with each other. 2. A power supply device capable of changing a supply pattern of power to be supplied to the electromagnetic induction heating coil by an output of one of an automatic power regulator and an automatic voltage regulator, and supplied by the power supply device. The power supply pattern is controlled by the output of the automatic power regulator between the center of the heated pipe and the vicinity of the pipe end, and is automatically controlled from the vicinity of the pipe end to the end of the dummy pipe. It is controlled by the output of the voltage regulator, and when the dummy pipe is a specific one, the supply pattern of the power supplied by the power supply device in accordance with the change of the heated pipe is corrected. The continuous induction heating apparatus according to claim 1. 3. A power supply device for supplying power to the electromagnetic induction heating coil, and a power supply pattern for supplying power to the electromagnetic induction heating coil by the power supply device according to a value of an inner and outer diameter of the heated pipe. And a value of the inner and outer diameters of the heated tube can be designated, and a power supply pattern is read from the storage means in accordance with the designation to be a power supply pattern of the power supply device. 2. The apparatus according to claim 1, further comprising means for designating the inner and outer diameters of the heated pipe.
A continuous induction heating device as described. 4. An annular electromagnetic member arranged so as to surround a peripheral direction of all the heated tubes in a direction perpendicular to a tube axis direction of a plurality of heated tubes whose ends are aligned without being stacked in a plane. While heating the heated tube continuously to the tube axis direction while moving the induction heating coil horizontally in the tube axis direction of all the heated tubes, the electromagnetic induction heating coil At the end of the heated pipe, a dummy pipe having the same end in the horizontal direction is arranged at the end of the heated pipe so as not to overlap with the heated pipe in the vertical direction so as to be positioned within the turn, and the automatic power adjustment is performed. A power supply device capable of changing a power supply pattern to be supplied to the electromagnetic induction heating coil by an output of one of a heater and an automatic voltage regulator, wherein the power supply pattern supplied by the power supply device is Heating tube center to tube end Between the vicinity of the pipe end and the end of the dummy pipe from the vicinity of the end of the pipe is controlled by the output of the automatic voltage regulator, the dummy pipe and the specific one The continuous induction heating apparatus is characterized in that, when the heating pipe is changed, the supply pattern of the electric power supplied by the electric power supply apparatus is corrected in accordance with the change of the pipe to be heated. 5. A ring-shaped electromagnetic member arranged so as to be orthogonal to a tube axis direction of a plurality of heated tubes whose ends are aligned without being stacked in a plane and to surround a peripheral direction of all the heated tubes. While heating the heated tube continuously to the tube axis direction while moving the induction heating coil horizontally in the tube axis direction of all the heated tubes, the electromagnetic induction heating coil At the end of the pipe to be heated, a dummy pipe having the same end in the horizontal direction is arranged at the end of the pipe so as not to overlap with the pipe to be heated in the vertical direction so as to be located in the turn. A power supply device that supplies power to the heating coil, a storage unit that stores a supply pattern of power to be supplied to the electromagnetic induction heating coil by the power supply device according to a value of an inner and outer diameter dimension of the heated pipe, Can specify the inner and outer diameter dimensions of the heated pipe Continuous induction heating, characterized in that it comprises a heated pipe inner and outer diameter dimension designating means corresponding to the designation and reading out a power supply pattern from the storage means and setting it as a power supply pattern of the power supply device. apparatus. 6. The continuous induction heating device according to claim 1, wherein a water supply / drainage pipe of a cooling water circulation type cooling device is connected to the dummy pipe so as to communicate therewith. 7. The apparatus according to claim 1, wherein the dummy pipe is conveyed by a mechanism that slides in the pipe axis direction in accordance with a change in the length of the pipe to be heated in the pipe axis direction. 7. The continuous induction heating apparatus according to any one of 6.