JP5900274B2 - Induction heating dryer - Google Patents

Description

  The present invention relates to an induction heating drying apparatus that performs induction heating on a vehicle body and dries the surface thereof.

Conventionally, after painting a vehicle body such as an automobile, the vehicle body is transported into a drying furnace, and hot air generated by burning a burner in the drying furnace is blown by a fan to The body is heated and dried.
On the other hand, when drying using a drying furnace, the temperature distribution in the drying furnace becomes uneven, the coating surface is dried before the inner surface, and the coating quality is affected. There is a risk that dust may adhere to the surface.

  Therefore, for example, in the induction heating drying apparatus of Patent Document 1, it is disclosed that induction heating is performed on the outer plate of each part of the vehicle body to dry the surface of the outer plate of each part. In this induction heating and drying apparatus, a plurality of metal plates having different specific resistance values are induction-heated by varying the current-carrying conditions of the induction heating coil, so that the outer plate of each part is stably heated substantially uniformly and dried. I am letting.

  In addition, for example, the induction heating device of Patent Document 2 has a plurality of upper coil groups arranged at a predetermined pitch facing the upper surface of the workpiece, and the same pitch as the arrangement pitch of the upper coil groups facing the lower surface of the workpiece. A plurality of lower coil groups. The center position of each coil of the upper coil group is arranged at a half pitch shift from the center position of each coil of the lower coil group, and the phase for energizing the upper coil group and the phase for energizing the upper coil group are set to 90. ° is shifted. And in the induction heating by the upper and lower coils sandwiching the workpiece, the temperature distribution of the workpiece is made uniform.

JP 2011-69500 A JP 2007-200143 A

  However, when it becomes a large structure such as a vehicle body, induction heating cannot be performed from both surfaces of the metal plate, and further contrivance is required to uniformly heat the entire structure.

  The present invention has been made in view of such a background, and has been obtained in an attempt to provide an induction heating drying apparatus capable of uniformly heating a wide range of a vehicle body.

One aspect of the present invention is an induction heating drying apparatus that performs induction heating on a vehicle body and dries the surface thereof.
A first induction heating coil group in which a plurality of first induction heating coils formed in a spiral shape are arranged in a plate shape adjacent to each other in the plane direction along the shape of the vehicle body;
A plurality of second induction heating coils formed in a spiral shape overlap substantially parallel to the first induction heating coil group, and are arranged in a plate shape adjacent to each other in the plane direction. And,
The first induction heating coils adjacent to each other are configured to energize in the reverse winding direction to flow current in the same direction in the outer peripheral portions facing each other, and generate magnetic lines of force stronger in the outer peripheral portion than in the other portions. Has been
The second induction heating coils adjacent to each other are configured to energize in the reverse winding direction to flow currents in the same direction in the outer peripheral portions facing each other, and generate magnetic field lines stronger than the other portions in the outer peripheral portions. Has been
The part where the strong magnetic field lines are generated in the first induction heating coil group and the part where the strong magnetic field lines are generated in the second induction heating coil group are shifted from each other in the surface direction.
The plurality of first induction heating coils and the plurality of second induction heating coils are configured to energize at different timings ,
The plurality of first induction heating coils and the plurality of second induction heating coils are arranged on substantially the entire outer surface of the bottom of the vehicle body (claim 1). ).

In the induction heating drying apparatus, a first induction heating coil group including a plurality of spiral-shaped first induction heating coils and a second induction heating coil group including a plurality of spiral-shaped second induction heating coils are stacked substantially in parallel. Is formed.
By energizing the first induction heating coils adjacent to each other in the reverse winding direction, current flows in the same direction in the outer peripheral portions of the first induction heating coil facing each other, and magnetic field lines stronger than the other portions are generated. Also, by energizing the second induction heating coils adjacent to each other in the opposite winding direction, current flows in the same direction in the outer peripheral portions of the second induction heating coil facing each other, and magnetic field lines stronger than the other portions are generated. . In addition, a portion where strong magnetic lines of force are generated in the first induction heating coil group and a portion where strong magnetic lines of force are generated in the second induction heating coil group are shifted from each other in the plane direction, and the plurality of first induction heating coils and the plurality of The second induction heating coil is energized at different timings.

Thereby, a strong eddy current is generated in a portion of the vehicle body that faces a portion where a strong magnetic field line is generated by each first induction heating coil, and the portion where the strong eddy current is generated is strongly heated. Further, the portion of the vehicle body that has not been strongly heated by each first induction heating coil is strongly heated by the strong eddy current generated by each second induction heating coil.
Therefore, according to the induction heating and drying apparatus, a wide part of the vehicle body can be uniformly heated.

Explanatory drawing which shows typically the state which has arrange | positioned the induction heating drying apparatus in the bottom part of the vehicle body concerning the Example in the state seen from the side. Explanatory drawing which shows typically the state which has arrange | positioned the induction heating drying apparatus in the bottom part of the vehicle body concerning the Example from the back. Explanatory drawing which shows the state which arranged the 1st induction heating coil group (or 2nd induction heating coil group) concerning an Example planarly. Explanatory drawing which shows typically the heating state of the bottom part of the vehicle body heated by the 1st induction heating coil group and the 2nd induction heating coil group concerning an Example. Explanatory drawing which shows typically the arrangement state of the 1st induction heating coil group and 2nd induction heating coil group concerning an Example in the state seen from the side. Explanatory drawing which shows typically the electrical structure of the induction heating drying apparatus concerning an Example. The graph which shows the timing which energizes to a 1st induction heating coil group and a 2nd induction heating coil group by taking time on a horizontal axis and taking an applied voltage on a vertical axis | shaft concerning an Example.

A preferred embodiment of the above-described induction heating drying apparatus will be described.
In the induction heating drying apparatus, the surface direction refers to a surface direction along the shape of the vehicle body.
The induction heating / drying apparatus may be configured to alternately energize the plurality of first induction heating coils and the plurality of second induction heating coils alternately (Claim 2).
In this case, a wide part of the vehicle body can be heated more uniformly and stably.

  In addition, the first induction heating coil group is formed by arranging a plurality of first induction heating coils formed in a square spiral shape in a grid pattern, and the second induction heating coil group includes a square spiral coil. A plurality of second induction heating coils formed in a shape are arranged in a grid pattern, and the arrangement pitch of the plurality of second induction heating coils is the same as the arrangement pitch of the plurality of first induction heating coils. The plurality of second induction heating coils may be arranged so as to be shifted in one direction by a substantially half pitch with respect to the plurality of first induction heating coils.

In this case, the spiral shapes of the first induction heating coil and the second induction heating coil are simple and appropriate, and a wide range of locations in the vehicle body can be uniformly and effectively heated.
In addition, what is meant to be shifted in one direction by approximately half a pitch is not only in the case of being shifted in one direction by a complete half pitch, but, for example, by a pitch of 1/3 to 2/3 The case where it is shifted in one direction is also included.

In the above embodiment of the present invention, the plurality of first induction heating coil and said plurality of second induction heating coil, that is arranged on substantially the entire surface in the outer surface of the bottom portion of the vehicle body.
Thereby , the bottom part of the vehicle body in which the steel plate used is thick and heat capacity is large can be heated effectively in a short time.

Further, the plurality of first induction heating coils and the plurality of second induction heating coils are energized by applying an alternating voltage of a predetermined frequency and energized, and when waiting to stop energization and wait. May be repeatedly executed alternately (claim 4 ).
In this case, in the induction heating drying apparatus, the first induction heating coil is energized without shifting the phase of the AC voltage applied by the first power supply apparatus and the phase of the AC voltage applied by the second power supply apparatus. And the time zone in which the second induction heating coil is energized are shifted. Therefore, induction heating of the bottom part of the vehicle body by the first induction heating coil group and induction heating of the bottom part of the vehicle body by the second induction heating coil group are separately and repeatedly performed on the first power supply device and the second power supply device. The peak value of required power can be suppressed.

Hereinafter, examples of the induction heating drying apparatus will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the induction heating and drying apparatus 1 of this example performs induction heating on the vehicle body 3 to dry the surface thereof. The induction heating drying apparatus 1 includes a first induction heating coil in which a plurality of first induction heating coils 21 </ b> A formed in a spiral shape are arranged in a plate shape adjacent to each other in the surface direction along the shape of the vehicle body 3. The group 2A and a plurality of second induction heating coils 21B formed in a spiral shape overlap substantially parallel to the first induction heating coil group 2A and are arranged in a plate shape adjacent to each other in the plane direction. 2 induction heating coil group 2B.

  As shown in FIG. 3, the first induction heating coils 21 </ b> A adjacent to each other are energized in the reverse winding direction so that the current I flows in the same direction in the outer peripheral portions 211 facing each other. It is configured to generate stronger magnetic field lines. The second induction heating coils 21B adjacent to each other are energized in the reverse winding direction to cause current I to flow in the same direction in the outer peripheral portions 211 facing each other, thereby generating magnetic field lines stronger than the other portions in the outer peripheral portion 211. It is configured to let you.

  As shown in FIGS. 4 and 5, the site where the strong magnetic field lines are generated in the first induction heating coil group 2 </ b> A and the site where the strong magnetic field lines are generated in the second induction heating coil group 2 </ b> B are shifted from each other in the plane direction. As shown in FIGS. 6 and 7, the induction heating drying apparatus 1 alternately and repeatedly energizes the plurality of first induction heating coils 21 </ b> A and the plurality of second induction heating coils 21 </ b> B at different energization timings. It is configured as follows.

Below, it demonstrates in detail with reference to FIGS. 1-7 about the induction heating drying apparatus 1 of this example.
1 and 2 schematically show a state in which the induction heating and drying apparatus 1 is disposed at the bottom 31 of the vehicle body 3, FIG. 1 is a side view, and FIG. 2 is a rear view. Show. As shown in the drawings, the induction heating and drying apparatus 1 of the present example heats the outer side surface (lower surface) 311 of the bottom portion 31 of the vehicle body (main body) 3 after painting such as electrodeposition coating. It is used for heating and drying the coating film on the steel plate constituting the steel 31. The vehicle body 3 is transported from a painting process in which the vehicle body 3 is painted to a drying process in which the vehicle body 3 is dried by the induction heating drying device 1 by the transport line. The induction heating drying apparatus 1 by the 1st induction heating coil group 2A and the 2nd induction heating coil group 2B is installed in the floor surface of the conveyance line which forms a drying process. The vehicle body 3 is disposed above the induction heating drying device 1.

  FIG. 6 schematically shows the electrical configuration of the induction heating drying apparatus 1. As shown in the figure, the plurality of first induction heating coils 21A are all connected in series, and the plurality of second induction heating coils 21B of this example are all connected in series. The plurality of first induction heating coils 21A are connected to a first power supply device 22A that applies an AC voltage, and the plurality of second induction heating coils 21B are connected to a second power supply device 22B that applies an AC voltage. Yes.

  The plurality of first induction heating coils 21 </ b> A and the plurality of second induction heating coils 21 </ b> B are provided for each predetermined number in order to vary the amount of heating depending on the part according to the thickness and shape of the steel plate at the bottom 31 of the vehicle body 3. It can be connected as a divided set. In this case, the first power supply device 22A and the second power supply device 22B are connected to each of the plurality of first induction heating coils 21A and the plurality of second induction heating coils 21B constituting the divided set, and each first power supply device is connected. Energization conditions such as an applied voltage value, an energization current value, an energization time, and a frequency can be set for each of 22A and each second power supply device 22B.

  FIG. 7 shows the timing of energizing the first induction heating coil group 2A and the second induction heating coil group 2B with the time t on the horizontal axis and the applied voltage V on the vertical axis. As shown in the figure, the first induction heating coil group 2A and the second induction heating coil group 2B are energized at the time of energization T1 in which an AC voltage of a predetermined frequency is applied and energized, and the energization is stopped and waited. The standby time T2 is repeatedly executed alternately. In the figure, an AC voltage is applied at the time of energization T1.

  In the induction heating drying apparatus 1, the first induction heating coil group 2A is energized without shifting the phase of the AC voltage applied by the first power supply apparatus 22A and the phase of the AC voltage applied by the second power supply apparatus 22B. Is shifted from the time zone in which the second induction heating coil group 2B is energized. Therefore, the induction heating of the bottom 31 of the vehicle body 3 by the first induction heating coil group 2A and the induction heating of the bottom 31 of the vehicle body 3 by the second induction heating coil group 2B are separated into the first power supply device 22A and the first The peak value of the power required for the two power supply device 22B can be suppressed.

  As shown in FIGS. 1 and 2, in the induction heating and drying apparatus 1 of the present example, the first induction heating coil group 2A is disposed on the side close to the bottom 31 of the vehicle body 3, and the second induction heating coil group 2B is disposed on the vehicle. The body 3 is disposed on the side far from the bottom 31. When the same energization is applied to the induction heating coil groups 2A and 2B, the bottom of the vehicle body 3 is increased by the distance of the second induction heating coil group 2B from the bottom 31 compared to the first induction heating coil group 2A. The amount of induction heating 31 is smaller in the second induction heating coil group 2B than in the first induction heating coil group 2A. Therefore, compared to the energizing conditions such as the applied voltage value, energizing current value, energizing time, frequency, etc. for the first induction heating coil group 2A, the applied voltage value, energizing current value, energizing time, frequency for the second induction heating coil group 2B are compared. The energization conditions such as can be increased. Thereby, the whole bottom part 31 of the vehicle body 3 can be heated more uniformly.

  FIG. 3 shows a state in which the first induction heating coil group 2A (or the second induction heating coil group 2B) is arranged in a plane. As shown in the figure, the first induction heating coil group 2A is formed by arranging a plurality of first induction heating coils 21A formed in a square spiral shape in a grid pattern. The second induction heating coil group 2B is formed by arranging a plurality of second induction heating coils 21B formed in a square spiral shape in a grid pattern.

  Each induction heating coil 21 </ b> A, 21 </ b> B is formed in a spiral shape in which a quadrangular shape increases sequentially from the central portion 212 toward the outer peripheral portion 211, and coil end portions 215, 216 are drawn out from the central portion 212 and the outermost peripheral portion 211. It is. The coil end portions 215 and 216 are connected to each other to form the first induction heating coil group 2A or the second induction heating coil group 2B. Each of the induction heating coils 21A and 21B is alternately energized from the coil end 215 on the outer peripheral side and the coil energized from the coil end 216 on the center side alternately in the vertical and horizontal directions of the surface direction. It is arranged.

In the position facing the bottom 31 of the vehicle body 3 having a straight flat plate shape, the first induction heating coils 21A and the second induction heating coils 21B are the same size except for those located at the ends. Each first induction heating coil 21A and each second induction heating coil 21B can be formed in the same size.
Moreover, in the position which opposes the bottom part 31 of the vehicle body 3 which has a bending flat plate shape (three-dimensional shape), according to the bending flat plate shape of the bottom part 31, each 1st induction heating coil 21A and each 2nd induction heating. The sizes of the coils 21B can be appropriately changed, and the sizes of the first induction heating coils 21A and the second induction heating coils 21B can also be appropriately changed.

  FIG. 5 schematically shows the arrangement state of the first induction heating coil group 2A and the second induction heating coil group 2B as viewed from the side. As shown in the figure, the arrangement pitch P of the plurality of second induction heating coils 21B is the same as the arrangement pitch P of the plurality of first induction heating coils 21A. The plurality of second induction heating coils 21B are arranged so as to be shifted in one direction by a substantially half pitch P / 2 with respect to the plurality of first induction heating coils 21A. It should be noted that the amount that each second induction heating coil 21B is displaced in one direction with respect to each first induction heating coil 21A is substantially half the pitch P /, particularly in the portion where the bottom 31 of the vehicle body 3 has a three-dimensional shape. 2 may be 1/3 to 2 / 3P.

  As shown in FIG. 3, in the first induction heating coil group 2 </ b> A, the remaining first induction heating coils 21 </ b> A except for the first induction heating coil 21 </ b> A located on the outermost side are adjacent to each other in the four-direction outer peripheral portion 211. It faces the outer peripheral portion 211 of the induction heating coil 21A. The first induction heating coils 21 </ b> A are arranged adjacent to each other in the vertical direction and the horizontal direction in the plane direction in which the first induction heating coils are aligned and arranged. Each first induction heating coil 21A includes a first induction heating coil 21A adjacent to one side or both sides in the vertical direction, a first induction heating coil 21A adjacent to one side or both sides in the horizontal direction, and a coil end portion on the outer peripheral side. The energization direction is opposite, depending on whether energization from 215 or energization from the coil end 216 on the center side is different. The outer peripheral portion 211 of each first induction heating coil 21A has an outer peripheral portion 211 adjacent to one side or both sides in the vertical direction and first induction adjacent to one side or both sides in the horizontal direction. The current I flows in the same direction as the outer peripheral portion 211 of the heating coil 21A.

  In the second induction heating coil group 2B, the remaining second induction heating coils 21B other than the outermost second induction heating coil 21B are the outer circumferences of the second induction heating coils 21B adjacent to the four-direction outer circumference portions 211. Opposite the portion 211. The second induction heating coils 21B are arranged adjacent to each other in the vertical direction and the horizontal direction in the plane direction in which the second induction heating coils 21B are arranged and arranged. Each of the second induction heating coils 21B includes a second induction heating coil 21B adjacent to one side or both sides in the vertical direction, a second induction heating coil 21B adjacent to one side or both sides in the horizontal direction, and a coil end on the outer peripheral side. The energization direction is opposite, depending on whether energization from 215 or energization from the coil end 216 on the center side is different. The outer peripheral portion 211 of each second induction heating coil 21B includes the outer peripheral portion 211 of the second induction heating coil 21B adjacent to one side or both sides in the vertical direction and the second induction adjacent to one side or both sides in the horizontal direction. The current I flows in the same direction as the outer peripheral portion 211 of the heating coil 21B.

  As shown in FIGS. 1 and 2, the plurality of first induction heating coils 21 </ b> A and the plurality of second induction heating coils 21 </ b> B are arranged on substantially the entire outer surface (lower surface) 311 of the bottom 31 of the vehicle body 3. The outer surface 311 of the bottom 31 of the vehicle body 3 is recessed in four locations, particularly where the wheel house 32 is provided, and has an uneven shape. The plurality of first induction heating coils 21 </ b> A and the plurality of second induction heating coils 21 </ b> B follow the unevenness on the outer surface 311 of the bottom 31, and are arranged with a predetermined gap with respect to the unevenness.

  FIG. 4 schematically shows a heating state of the bottom 31 of the vehicle body 3 heated by the first induction heating coil group 2A and the second induction heating coil group 2B. In the figure, each first induction heating coil 21A is simply indicated by a broken-line square, and each second induction heating coil 21B is simply indicated by a solid-line square. And the site | part X heated to high temperature by each 1st induction heating coil 21A is shown by thin grating, and the site | part Y heated by high temperature by each 2nd induction heating coil 21B is shown by dark grating.

  As shown in FIGS. 3 and 4, in the induction heating drying apparatus 1 of this example, strong magnetic lines of force are generated in the vicinity of the positions where the outer peripheral portions 211 of the induction heating coils 21 </ b> A and 21 </ b> B face each other. A strong eddy current I is generated in the portion of the bottom 31 of the vehicle body 3 that faces the bottom of the vehicle body 3, and the portion of the bottom 31 is heated to a high temperature. On the other hand, strong lines of magnetic force do not occur in the vicinity of the central portion 212 of each induction heating coil 21A, 21B and in the vicinity of the corner portion 213 of each induction heating coil 21A, 21B, and they face the vicinity of these portions 212, 213. A weak eddy current I is generated in the bottom 31 portion of the vehicle body 3, and the bottom 31 is heated to a low temperature.

The plurality of second induction heating coils 21B are arranged so as to be shifted in one direction by a substantially half pitch P / 2 with respect to the plurality of first induction heating coils 21A. Further, the outer peripheral portion 211 of the plurality of second induction heating coils 21B is overlapped with the vicinity of each central portion 212 and each corner portion 213 of the plurality of first induction heating coils 21A so as to overlap each other. ing. Thereby, it can heat strongly by each 2nd induction heating coil 21B so that the part of the vehicle body 3 which was not heated strongly by each 1st induction heating coil 21A may be supplemented.
Therefore, according to the induction heating and drying apparatus 1 of this example, the entire bottom portion 31 of the vehicle body 3 can be heated uniformly.

DESCRIPTION OF SYMBOLS 1 Induction heating drying apparatus 2A 1st induction heating coil group 21A 1st induction heating coil 2B 2nd induction heating coil group 21B 2nd induction heating coil 211 Outer peripheral part 3 Vehicle body 31 Bottom

Claims (4)

An induction heating drying device that performs induction heating on a vehicle body and dries the surface thereof,
A first induction heating coil group in which a plurality of first induction heating coils formed in a spiral shape are arranged in a plate shape adjacent to each other in the plane direction along the shape of the vehicle body;
A plurality of second induction heating coils formed in a spiral shape overlap substantially parallel to the first induction heating coil group, and are arranged in a plate shape adjacent to each other in the plane direction. And,
The first induction heating coils adjacent to each other are configured to energize in the reverse winding direction to flow current in the same direction in the outer peripheral portions facing each other, and generate magnetic lines of force stronger in the outer peripheral portion than in the other portions. Has been
The second induction heating coils adjacent to each other are configured to energize in the reverse winding direction to flow currents in the same direction in the outer peripheral portions facing each other, and generate magnetic field lines stronger than the other portions in the outer peripheral portions. Has been
The part where the strong magnetic field lines are generated in the first induction heating coil group and the part where the strong magnetic field lines are generated in the second induction heating coil group are shifted from each other in the surface direction.
The plurality of first induction heating coils and the plurality of second induction heating coils are configured to energize at different timings ,
The induction heating drying apparatus , wherein the plurality of first induction heating coils and the plurality of second induction heating coils are arranged on substantially the entire outer surface of the bottom of the vehicle body .   2. The induction heating drying apparatus according to claim 1, wherein the plurality of first induction heating coils and the plurality of second induction heating coils are alternately energized repeatedly. 3. apparatus. The induction heating drying apparatus according to claim 1 or 2, wherein the first induction heating coil group is formed by arranging a plurality of first induction heating coils formed in a square spiral shape in a grid pattern,
The second induction heating coil group is formed by arranging a plurality of second induction heating coils formed in a square spiral shape in a grid pattern,
The arrangement pitch of the plurality of second induction heating coils is the same as the arrangement pitch of the plurality of first induction heating coils,
The induction heating drying apparatus, wherein the plurality of second induction heating coils are arranged to be shifted in one direction by a substantially half pitch with respect to the plurality of first induction heating coils. The induction heating drying apparatus according to any one of claims 1 to 3, wherein the plurality of first induction heating coils and the plurality of second induction heating coils are energized by applying an AC voltage having a predetermined frequency. The induction heating drying apparatus is configured to alternately and repeatedly execute the energization to perform and the standby to stop the energization and wait.

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