JP6766769B2 - Drying device for painting - Google Patents

Description

The present invention relates to a coating drying device that dries a painted work.

This type of paint drying device is used, for example, to dry a coating film of an automobile body after being painted in a painting process. As an example of this drying device, there is known one configured to dry a coating film of the automobile body by hot air while continuously transporting the automobile body in a drying furnace.

In this drying device, hot air rises in the drying furnace and is difficult to stay in the lower part of the furnace, and thick members are concentrated on the bottom of the automobile body, so that the temperature of the bottom is difficult to rise. Therefore, there is a problem that the temperature rising time at the bottom of the automobile body becomes rate-determining and the time required for raising the temperature of the entire automobile body becomes long. Further, when hot air is used in the initial stage of drying the coating film of the automobile body, foreign matter such as dust wound up by the hot air tends to adhere to the coating film, which causes a problem that the coating quality of the automobile body deteriorates. Can occur.

Therefore, in order to solve these problems, for example, the drying furnace disclosed in Patent Document 1 below can be adopted. This drying furnace includes a conveyor for tact transport (intermittent transport) so as to temporarily stop the automobile body at each stop position, and a heating device having a heating coil for heating the automobile body conveyed by the conveyor. ing.
According to this drying furnace, by arranging the heating device toward the bottom of the automobile body, the bottom of the automobile body can be directly heated without using hot air. Therefore, the temperature rising time can be shortened as compared with the structure in which the automobile body is heated by hot air, and foreign matter such as dust is less likely to adhere to the coating film, so that deterioration of the coating quality of the automobile body can be prevented.

Japanese Unexamined Patent Publication No. 2005-87819

However, when this drying furnace is adopted, it is necessary to repeat a plurality of processes of temporarily stopping the automobile body at each stop position and heating the automobile body, which is more drying than a structure in which the automobile body is continuously conveyed and heated. The time required for the entire process becomes longer.
However, if tact transfer is stopped and continuous transfer is to be adopted, for example, the heating device itself must be placed in a high-temperature drying furnace and continuously moved in synchronization with the movement of the automobile body. Becomes complicated.
Further, such a problem may occur not only in the drying of the coating film of the painted automobile body but also in the drying of the coating film of the work other than the automobile body.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a coating drying apparatus capable of shortening the time required for drying a coating film and simplifying the structure while preventing deterioration of coating quality of a work. Is to be.

One aspect of the present invention is
A paint drying device that dries painted workpieces.
With a drying oven
A conveyor for continuously transporting the work in the transport direction through the space inside the drying furnace,
A member to be heated that is introduced into the space inside the drying furnace and moves in the transport direction while facing the work that is continuously transported in the transport direction by the conveyor.
A heating device that heats the member to be heated before introducing the drying furnace into the space inside the furnace,
Equipped with a,
The conveyor includes an endless annular belt portion, a drive portion for circulating and rotating the belt portion, and a support portion provided on the belt surface side of the belt portion so as to support the work.
The coating drying device, which is provided on the surface side of the belt portion so that the heated member is located directly below the work supported by the support portion of the belt portion .
It is in.

In the above-mentioned coating drying apparatus, the work is continuously conveyed in the conveying direction through the space inside the drying furnace by a conveyor. At this time, the member to be heated, which has been directly heated by the heating device before being introduced into the furnace space of the drying furnace, moves in the transport direction while facing the work. Therefore, in the furnace space of the drying furnace, the work is continuously transported in the transport direction while being indirectly heated by the radiant heat released from the member to be heated and by the natural convection of the air heated by the radiant heat. Will be done.

Therefore, according to this coating drying device, it is possible to prevent a deterioration in coating quality that may occur when the work is heated with hot air. Further, since the work can be continuously heated by the member to be heated while continuously transporting the work, the time required for the entire drying process can be shortened as compared with the case where the work is intermittently transported as in the tact transport. Further, since the heating device that is the heating source of the member to be heated can be arranged outside the drying furnace, the structure can be simplified as compared with the case where the heating device itself is arranged in the furnace space of the drying furnace.

As described above, according to the above aspect, it is possible to provide a coating drying apparatus capable of shortening the time required for drying the coating film and simplifying the structure while preventing deterioration of the coating quality of the work. Become.

An overall view of the coating drying apparatus of this embodiment as viewed from the side. The view which looked at the 1st drying zone of the drying furnace in FIG. 1 from the introduction port side. The view which looked at the 2nd drying zone of the drying furnace in FIG. 1 from the introduction port side. A partially enlarged view of the belt portion of the conveyor in FIG. FIG. 4 is a cross-sectional view taken along the line VV of FIG. A perspective view of the belt portion of the conveyor in FIG. 1 as viewed from diagonally above.

Preferred embodiments of the above aspects will be described below.

In the above-mentioned drying apparatus for painting, the conveyor includes an endless annular belt portion, a drive portion for circulating and rotating the belt portion, and a support portion provided on the belt surface side of the belt portion so as to support the work. , And the member to be heated is preferably provided on the surface side of the belt portion so as to be located directly below the work supported by the support portion of the belt portion.

In this drying device, the belt portion circulates and rotates when the driving portion drives the rotating portion, and the member to be heated moves directly under the work in the transport direction integrally with the belt portion. Therefore, the member to be heated can be integrally conveyed with the work at the same speed, and the heating efficiency of the work by the member to be heated can be improved. In particular, by heating the work from directly below it, the time required for raising the temperature of the entire work can be shortened.
Further, by circulating and rotating the member to be heated directly by the heating device by a conveyor in the preparatory stage before transporting the work, it is possible to raise the temperature of the space inside the drying furnace in a short time. The occurrence of dew condensation can be prevented by raising the temperature of the inner space in advance.

In the coating drying device, a plurality of the members to be heated are arranged on the belt portion at intervals in the transport direction, and one member to be heated moves directly under the work in the transport direction. It is preferable that the other member to be heated is configured to be heated by the heating device.

According to this drying device, it is rational because the member to be heated to be used for drying the next work can be preheated and prepared by the heating device during the drying of one work.

In the coating drying device, the member to be heated contains a magnetic material, the heating device is an induction heating device having a heating coil connected to an AC power source, and an AC current is applied to the heating coil. It is preferable that the member to be heated is heated by utilizing the self-heating of the magnetic material due to the electromagnetic induction.

According to this drying device, the temperature of the member to be heated can be raised in a short time by heating the member to be heated by using the induction heating device.

The coating drying device includes a temperature detecting unit that detects the temperature of the member to be heated after being heated by the heating device and before being introduced into the furnace space of the drying furnace, and the temperature. It is preferable to include a control device that controls the output of the heating device so that the detection temperature of the member to be heated detected by the detection unit becomes the target temperature.

According to this drying device, it is possible to adjust the drying state of the coating film of the work by the member to be heated to be constant.

In the above-mentioned coating drying device, the above-mentioned control device has a storage unit for storing the above-mentioned target temperature corresponding to each of a plurality of the above-mentioned workpieces of different types, and depends on the type of the above-mentioned workpiece continuously conveyed by the conveyor. It is preferable to read the target temperature corresponding to the work from the storage unit and control the output of the heating device so that the detection temperature detected by the temperature detection unit becomes the target temperature.

According to this drying device, the heating device can be adjusted to the drying conditions suitable for each of a plurality of different types of workpieces, and a drying device having excellent versatility can be realized.

In the above-mentioned coating drying apparatus, the above-mentioned drying furnace has a first drying zone, a second drying zone located downstream of the first drying zone in the transport direction, and the second drying zone in the space inside the furnace. It is preferable to provide a hot air supply unit that supplies hot air toward the sea.

In this drying apparatus, the hot air supply unit is not provided in the first drying zone, but is provided only in the second drying zone located downstream of the first drying zone. The first drying zone and the second drying zone may be continuous with each other, or another drying zone may be interposed between the first drying zone and the second drying zone.
Here, while the work in the initial stage of drying is transported in the first drying zone, the work in the stage where the coating film is cured more than in the first drying zone is transported in the second drying zone. Therefore, in the second drying zone, foreign matter wound up by the hot air is unlikely to adhere to the coating film of the work, and on the other hand, the temperature rising time of the entire work can be shortened by using the hot air.

Hereinafter, embodiments of a coating drying apparatus used for drying a coating film of a painted work will be described with reference to the drawings.

In the drawings for explaining this embodiment, unless otherwise specified, the first direction which is the longitudinal direction of the drying furnace constituting the coating drying apparatus is indicated by an arrow X, and the second direction which is the width direction of the drying furnace. The direction is indicated by an arrow Y, and the third direction, which is the height direction (vertical direction) of the drying furnace orthogonal to both the first direction X and the second direction Y, is indicated by an arrow Z.

(Embodiment)
As shown in FIGS. 1 to 3, the coating drying device (hereinafter, simply referred to as “drying device”) 1 of the present embodiment is a device for drying a coating film of a work W as an automobile body. Is. According to this drying treatment, the coating film formed on the surface of the work W is heated and dried by heating from the outside of the work W. This drying process is also called "baking drying".

The drying device 1 includes a drying furnace 10, a conveyor 20, a member to be heated 30, a heating device 40, a temperature sensor 50, and a control device 60.

The drying furnace 10 has a substantially square tubular shape in which the cylinder shaft extends in the first direction X, and the introduction port 10a provided at one of both ends of the first direction X and one of both ends thereof. It is provided with a lead-out port 10b provided on the other side of the above, and a furnace space 11 as an in-cylinder space. In this case, the direction in which the work W directs the space 11 in the furnace from the introduction port 10a side to the outlet port 10b side is the transport direction D of the work W.

The drying furnace 10 includes a first drying zone 11a and a second drying zone 11b in the furnace space 11. The first drying zone 11a is located most upstream in the furnace space 11 in the transport direction D of the work W. The second drying zone 11b is continuous with the first drying zone 11a, and is located downstream of the first drying zone 11a in the furnace space 11 in the transport direction D of the work W.

Here, the first drying zone 11a is a region in the furnace space 11 where the work W is conveyed in the initial stage of drying. On the other hand, the second drying zone 11b is a region in the furnace space 11 in which the work W is transported in a state where the coating film is cured more than the first drying zone 11a. The first dry zone 11a can be referred to as a "dark red zone", and the second dry zone 11b can also be referred to as a "convection zone".

As shown in FIG. 2, the first drying zone 11a of the inner space 11 of the drying furnace 10 is provided with a side heating structure for heating the inner space 11 from the furnace wall surfaces 13 on both sides in the second direction Y. ing. The side heating structure includes a structure for heating the furnace space 11 by circulating hot air (see the arrow in FIG. 2) and a structure for heating the furnace space 11 using a side heater panel and an infrared lamp. Both have been adopted.

As shown in FIG. 3, an air duct 12 as a hot air supply unit is provided in the furnace space 11 of the drying furnace 10. The air duct 12 is configured to be able to supply hot air toward the second drying zone 11b of the furnace space 11. That is, the air duct 12 is not provided in the first drying zone 11a, but is provided only in the second drying zone 11b located downstream of the first drying zone 11a.

A plurality of blower ducts 12 (three in FIG. 3) are provided on the furnace wall surfaces 13 (see FIG. 3) on both sides of the second direction Y in the second drying zone 11b of the furnace space 11. The blower duct 12 is connected to a discharge pipe of a blower 14 capable of blowing combustion gas burned by liquefied natural gas (LNG).

Therefore, the hot air of the combustion gas is supplied to the second drying zone 11b through the air duct 12 after being discharged by the blower 14. Further, the hot air flowing through the second drying zone 11b is exhausted through the exhaust duct 16. In this case, the coating film of the work W is being cured in the second drying zone 11b, and foreign matter wound up by the hot air is less likely to adhere to the coating film of the work W, while the work W is used by using the hot air. The overall temperature rise time can be shortened.

For the purpose of shortening the temperature rising time of the entire work W, a hot air supply unit similar to the air duct 12 can be added to the first drying zone 11a of the furnace space 11. In this case, the hot air supplied from the hot air supply unit is preferably set to a low air volume that does not wind up foreign matter. As a result, it is possible to prevent foreign matter from adhering to the coating film of the work W while shortening the temperature rising time of the entire work W in the first drying zone 11a.

The conveyor 20 is a conveyor means for continuously transporting the work W in the transport direction D through the furnace space 11 of the drying furnace 10. According to this conveyor 20, a work W is introduced into the furnace from the introduction port 10a of the drying furnace 10, passes through the furnace space 11 in the transport direction D, and then is led out from the outlet 10b to the outside of the furnace. The operation can be performed continuously without a temporary stop.

The term "continuous transport" as used herein is a form different from the intermittent transport mode such as tact transport in which the transported object is repeatedly moved and stopped, and the transported object is temporarily stopped. It refers to a form in which continuous transportation is performed at a constant speed or while changing the speed.

The conveyor 20 serves as a drive unit that drives an endless annular belt portion 23 stretched between the front and rear rotating portions 21 and 22, and a rear rotating portion 22 to circulate and rotate the belt portion 23. It has an electric motor 26 and a plurality of attachments 27 as support portions provided on the belt surface side of the belt portion 23 so as to support the work W.

The belt portion 23 is configured to circulate and rotate in the clockwise direction in FIG. 1 by being driven by the electric motor 26. Therefore, the belt portion 23 moves in the furnace space 11 of the drying furnace 10 in the transport direction D, is inverted by the rotating portion 22, and then moves in the direction opposite to the transport direction D.

At this time, the belt portion 23 moves in the substantially square cylinder-shaped conveyor case 15 attached below the third direction Z of the drying furnace 10 in the direction opposite to the transport direction D. The belt portion 23 is supported via a rotating body 28 provided in the conveyor case 15. Then, after reversing at the rotating portion 21, the space 11 in the drying furnace 10 is moved in the transport direction D again.

Here, as shown in FIG. 4, the belt portion 23 is bridged and fixed between two endless annular chains 24 arranged apart from each other in the second direction Y and these two chains 24. Moreover, a plurality of slats 25 juxtaposed in the transport direction D are provided. The attach 27 is provided on some of the slats 25 among the plurality of slats 25.

The attach 27 is provided with an engaging recess 27a provided on the bottom surface of the work W and capable of holding the engaging portion Wa. In the present embodiment, a total of four attachments 27, which are a combination of two attachments 27 provided on one slat 25 and two attachments 27 provided on another slat 25, are used to engage two front and rear parts of one work W. It is configured to hold the joint Wa.

As shown in FIGS. 4 and 5, the chain 24 is formed between a plurality of pairs of plates 24a and 24b and two rollers 24c rotatably provided between each pair of plates 24a and 24b about a rotation shaft 24d. And a bracket 24e attached to the plates 24a and 24b and fixed to the slats 25. Further, the roller 24c is movably supported by a support rail 29 provided in the furnace space 11 of the drying furnace 10. Therefore, the chain 24 can smoothly move in the furnace space 11 of the drying furnace 10 in the transport direction D by the support rail 29.

The member 30 to be heated is located on the surface of the slat 25 on the surface side of the belt portion 23 so as to be located directly below the work W supported by the attach 27, particularly from the upper end portion 27b of the attach 27 on the surface of the slat 25. Is also installed in a low place.

In this embodiment, a plurality of members 30 to be heated having the same shape and all have the same dimensions are used. The member 30 to be heated is a flat plate-shaped member made of an iron-based material that is a magnetic material, and is heated by the heating device 40. That is, the member to be heated 30 itself is configured as a magnetic material. By making the plurality of members 30 to be heated have the same shape, the heating conditions of the heating device 40 for each of the plurality of members 30 to be heated can be made constant.

As shown in FIG. 6, the plurality of members to be heated 30 are arranged on the belt portion 23 at intervals in the transport direction D. When each member 30 to be heated is continuously transported in the transport direction D by the belt portion 23 of the conveyor 20 in the furnace space 11 of the drying furnace 10, the work W is directly under the work W while facing the work W. It is configured to move in the transport direction D in synchronization with.

The "face-to-face state" as used herein means a state in which the member to be heated 30 is directly opposed to the work W without interposing another member. This state can also be said to be a state in which the member 30 to be heated and the work W face each other with a minute space apart, or a state in which the member 30 to be heated and the work W are close to each other.

As shown in FIGS. 1 and 2, the heating device 40 has a function of heating the member 30 to be heated before the drying furnace 10 is introduced into the furnace space 11. In order to realize this function, it is preferable that the heating device 40 is arranged outside the drying furnace 10 and in the vicinity of the introduction port 10a of the drying furnace 10 toward the member to be heated 30. As a result, the member 30 to be heated by the heating device 40 can be quickly introduced into the furnace space 11 from the introduction port 10a of the drying furnace 10 without lowering the temperature thereof.

After the member 30 to be heated is introduced into the furnace space 11 of the drying furnace 10, the member 30 is integrally with the belt portion 23 and moves directly under the work W in the transport direction D. That is, the heated member 30 moves in the transport direction D at the same speed as the work W. After that, the member 30 to be heated is led out from the outlet 10b of the drying furnace 10 to the outside of the furnace, and this time, the member 30 moves in the conveyor case 15 in the direction opposite to the transport direction D. Then, the member 30 to be heated comes out of the conveyor case 15 and is heated by the heating device 40, and then is introduced again into the furnace space 11 from the introduction port 10a of the drying furnace 10.

In the present embodiment, when one member 30 to be heated moves directly under the work W in the transport direction D, another member 30 to be heated is heated by the heating device 40. According to this configuration, during the drying of the coating film of one work W, the member 30 to be heated used for drying the coating film of the next work W can be prepared by heating in advance with the heating device 40. Therefore, it is rational.

Further, in the present embodiment, the conveyor case 15 is configured to surround the moving path of the heated member 30 outside the drying furnace 10. According to this configuration, the temperature of the member 30 to be heated is less likely to decrease, so that the output of the heating device 40 can be suppressed and the energy efficiency can be improved.

The heating device 40 is configured as an induction heating device having a heating coil 41. The heating coil 41 is connected to the AC power supply 70 via an inverter circuit (not shown). According to this configuration, the member 30 to be heated is heated by utilizing the fact that the magnetic material self-heats due to electromagnetic induction when an alternating current is applied to the heating coil 41 of the heating device 40 from the alternating current power source 70. The heating device 40 is also referred to as an "IH (Induction Heating) heater". The number of heating devices 40 to be installed can be appropriately selected as needed.

Here, the principle of heating the member 30 to be heated will be specifically described. When an alternating current flows through the heating coil 41 of the heating device 40, magnetic field lines are generated so as to surround the heating coil 41. Then, due to the magnetic field lines, an eddy current flows through the heated member 30 made of an iron material by the principle of electromagnetic induction. At this time, Joule heat is generated by electrical resistance when an eddy current flows through the member 30 to be heated. As a result, the member 30 to be heated is heated by self-heating. According to this heating device 40, only the heated member 30 itself can be heated by the principle of electromagnetic induction, and rapid heating of the heated member 30 can be realized. Therefore, the temperature of the member 30 to be heated can be raised in a short time.

The temperature sensor 50 is configured as a temperature detection unit that detects the temperature of the member 30 to be heated after being heated by the heating device 40 and before being introduced into the furnace space 11 of the drying furnace 10. In order to realize the function as the temperature detection unit, the temperature sensor 50 is arranged outside the drying furnace 10 and between the heating device 40 and the introduction port 10a of the drying furnace 10 toward the heated member 30. Has been done. According to the temperature sensor 50, the temperature immediately after being heated by the heating device 40 for each of the plurality of members 30 to be heated is continuously detected.

The control device 60 is electrically connected to each connection element of the blower 14, the electric motor 26, the heating device 40, the temperature sensor 50, and the power supply 70. The control device 60 includes a storage unit 61 that stores information detected by a target connection element, a scheduled calculation formula, and the like in advance, a calculation unit 62 that performs a calculation based on the scheduled calculation formula, and the calculation. An output unit 63 that outputs a control signal to a target connection element based on the calculation result of the unit 62 is provided.

According to the control device 60, the on / on of the blower 14 and the electric motor 26 are controlled. Further, according to the control device 60, the output of the heating device 40 is feedback-controlled so that the detected temperature T of the member to be heated 30 detected by the temperature sensor 50 becomes the target temperature Ta. As a result, the detection temperature T of each member 30 to be heated can be controlled to the target temperature Ta, and the dry state of the coating film of the work W by the member 30 to be heated can be adjusted to be constant.

Further, the drying device 1 of the present embodiment is configured to dry a plurality of different types of work W. Therefore, the storage unit 61 of the control device 60 stores the target temperature Ta corresponding to each of the plurality of work Ws of different types. Therefore, the control device 60 reads out the target temperature Ta corresponding to the work W from the storage unit 61 according to the type of the work W continuously conveyed by the conveyor 20, and the detection temperature T detected by the temperature sensor 50. Controls the output of the heating device 40 so that the temperature reaches the target temperature Ta. That is, the output of the heating device 40 is variably controlled based on the target temperature Ta according to the type of the work W.

As a result, the detected temperature T of the member 30 to be heated is adjusted to a temperature suitable for the work W to be heated. Therefore, the heating device 40 can be adjusted to the drying conditions suitable for each of the plurality of different types of work W, and the drying device 1 having excellent versatility can be realized.

The control device 60 may be configured to specify the type of work W continuously conveyed by the conveyor 20 by detecting the work information input by the operator, or the data captured by a camera or the like. It may be configured to specify the type of work W based on the image processing result.

According to the above-described embodiment, the following effects can be obtained.

In the above-mentioned drying apparatus 1, the work W is continuously conveyed by the conveyor 20 through the furnace space 11 of the drying furnace 10 in the conveying direction D. At this time, the member 30 to be heated, which has been directly heated by the heating device 40 before being introduced into the furnace space 11 of the drying furnace 10, is conveyed directly under the work W in synchronization with the conveyor 20 while facing the work W. Move in direction D. Therefore, in the furnace space 11 of the drying furnace 10, the work W is conveyed while being indirectly heated by the radiant heat released from the member 30 to be heated and by the natural convection of the air heated by the radiant heat. It is continuously conveyed in the direction D.

Therefore, according to this drying device 1, it is possible to prevent a deterioration in coating quality that may occur when the work W is heated with hot air. Further, since the work W can be continuously heated by the member 30 to be heated while being continuously conveyed, the time required for the entire drying process can be shortened as compared with the case where the work W is intermittently conveyed as in the tact transfer. .. Further, since the heating device 40, which is the heating source of the member 30 to be heated, can be arranged outside the drying furnace 10, the structure can be simplified as compared with the case where the heating device 40 itself is arranged in the furnace space 11 of the drying furnace 10. ..

As a result, it is possible to provide a drying device 1 capable of shortening the time required for drying while preventing deterioration of the coating quality of the work W and simplifying the structure.

In particular, by heating the work W from directly below the work W with the member 30 to be heated, the temperature of the bottom portion tends to rise even when the thick members are concentrated on the bottom portion of the work W. Therefore, it is possible to suppress the temperature difference between each part of the work W to be small and prevent the work W from being distorted. Further, since the temperature rising time at the bottom of the work W can be shortened, the number of steps in the drying furnace 10 can be reduced, the length (furnace length) of the transport direction D of the drying furnace 10 can be shortened, and the drying furnace 10 can be provided downstream of the drying furnace 10. It is possible to shorten the length of the storage unit (storage length) as a save line.

According to the above-mentioned drying device 1, the belt portion 23 circulates and rotates when the electric motor 26 drives the rotating portion 22, and the member 30 to be heated is integrated with the belt portion 23 directly under the work W in the transport direction. Move to D. Therefore, the member 30 to be heated can be integrally conveyed with the work W at the same speed, and the heating efficiency of the work W by the member 30 to be heated can be improved.

According to the above-mentioned drying apparatus 1, the member 30 to be heated, which is directly heated by the heating apparatus 40, is circulated and rotated by the conveyor 20 in the preparatory stage before the work W is conveyed, so that the space 11 in the drying furnace 10 The temperature rise can be performed in a short time, and the occurrence of dew condensation can be prevented by raising the temperature of the furnace space 11 in advance.

For example, when the combustion gas is supplied to the furnace space 11 without raising the temperature of the drying furnace 10 in advance under low temperature conditions such as winter, the combustion gas is rapidly cooled and dew condensation on the furnace wall surface and adheres to the furnace wall surface. There is a concern that the deposits on the surface may peel off. In this case, the deposits peeled off from the furnace wall surface may affect the coating quality of the work W.

Therefore, in the present embodiment, when the combustion gas is supplied to the furnace space 11 by circulating and rotating the heated member 30 directly heated by the heating device 40 in the preparatory stage to raise the temperature of the drying furnace 10 in advance. It is possible to prevent the occurrence of dew condensation and prevent the deposits adhering to the furnace wall surface from peeling off.

The present invention is not limited to the above-described embodiment, and various applications and modifications can be considered as long as the object of the present invention is not deviated. For example, the following embodiments to which the embodiments are applied can also be implemented.

In the above embodiment, the case where the member 30 to be heated moves directly under the work W in the transport direction D has been illustrated, but in the reference example, if the member 30 to be heated faces the work W, the member to be heated 30 can be moved in the transport direction D at a position other than directly below the work W. For example, it is possible to adopt a structure in which the member 30 to be heated moves in the transport direction D on the side or above of the work W.

In the above embodiment, the case where the heated member 30 itself is configured as a magnetic material, that is, the case where the entire heated member 30 is a magnetic material has been illustrated, but instead of this, a part of the heated member 30 is used. It may be composed of a magnetic material. Further, the whole or a part of the member to be heated 30 may be made of a stainless steel material which is a magnetic material.

In the above embodiment, the case where the member 30 to be heated is heated by using the principle of electromagnetic induction has been illustrated, but instead of this, the member 30 to be heated can be heated by another method. For example, a structure is adopted in which a heated member made of a material having high thermal conductivity is used instead of the heated member 30, and the heated member is heated with hot air and then introduced into the furnace space 11 of the drying furnace 10. You can also.

In the above embodiment, the case where the member 30 to be heated moves directly under the work W in the transport direction D at the same speed as the work W has been illustrated, but instead of this, the member 30 to be heated is directly under the work W. It is also possible to adopt a structure that moves the work W at a speed different from that of the work W.

In the above embodiment, the conveyor 20 having a structure in which the belt portion 23 rotates in an annular shape for transporting the work W has been illustrated, but in the reference example, instead of this, the conveyor 20 linearly moves in one direction or bidirectionally. It is also possible to adopt a conveyor having a belt portion that reciprocates.

In the above embodiment, the case where the output of the heating device 40 is controlled so that the detected temperature T of the member to be heated 30 detected by the temperature sensor 50 becomes the target temperature Ta is illustrated, but strict temperature control is not required. In some cases, this control can be omitted.

In the above embodiment, assuming that the drying device 1 dries a plurality of different types of work W, the storage unit 61 of the control device 60 sets a target temperature Ta corresponding to each of the plurality of different types of work W. Although the case of storing in advance has been illustrated, when drying a single type of work W, it is needless to say that the storage unit 61 of the control device 60 needs to store only one target temperature Ta for this work W. Is.

In the above embodiment, the case where the first drying zone 11a and the second drying zone 11b are continuous with each other in the furnace space 11 of the drying furnace 10 has been illustrated, but between the first drying zone 11a and the second drying zone 11b. May be intervened by another drying zone.

In the above embodiment, the drying device 1 for the automobile body, which is the work W, has been illustrated, but the drying device 1 can also be applied to a drying facility for a work other than the automobile body.

1 Drying device for painting 10 Drying furnace 11 Space inside the furnace 11a 1st drying zone 11b 2nd drying zone 12 Blower duct (hot air supply section)
20 Conveyor 23 Belt part 26 Electric motor (Drive part)
27 Attach (support part)
30 Member to be heated (magnetic material)
40 Heating device (induction heating device)
41 Heating coil 50 Temperature sensor (Temperature detector)
60 Control device 61 Storage unit 70 AC power supply D Transport direction T Detection temperature Ta Target temperature W Work (automobile body)

Claims (6)

A paint drying device that dries painted workpieces.
With a drying oven
A conveyor for continuously transporting the work in the transport direction through the space inside the drying furnace,
A member to be heated that is introduced into the space inside the drying furnace and moves in the transport direction while facing the work that is continuously transported in the transport direction by the conveyor.
A heating device that heats the member to be heated before introducing the drying furnace into the space inside the furnace,
Equipped with a,
The conveyor includes an endless annular belt portion, a drive portion for circulating and rotating the belt portion, and a support portion provided on the belt surface side of the belt portion so as to support the work.
The coating drying device is provided on the surface side of the belt portion so that the heated member is located directly under the work supported by the support portion of the belt portion . When a plurality of the members to be heated are arranged on the belt portion at intervals in the transport direction and one member to be heated moves directly under the work in the transport direction, another member to be heated is different. The coating drying device according to claim 1 , wherein the member is configured to be heated by the heating device. The member to be heated includes a magnetic material, and the heating device is an induction heating device having a heating coil connected to an AC power source, and the magnetic material is electromagnetically induced when an AC current is applied to the heating coil. The coating drying apparatus according to claim 1 or 2 , wherein the member to be heated is heated by utilizing the self-heating. A temperature detection unit that detects the temperature of the member to be heated after being heated by the heating device and before being introduced into the furnace space of the drying furnace.
A control device that controls the output of the heating device so that the detection temperature of the member to be heated detected by the temperature detection unit reaches the target temperature.
The coating drying apparatus according to any one of claims 1 to 3 . The control device has a storage unit for storing the target temperature corresponding to each of a plurality of different types of the work, and the storage unit is transferred to the work according to the type of the work continuously conveyed by the conveyor. The coating drying device according to claim 4 , wherein the corresponding target temperature is read out and the output of the heating device is controlled so that the detection temperature detected by the temperature detection unit becomes the target temperature. The drying furnace supplies hot air to the space inside the furnace toward the first drying zone, the second drying zone located downstream of the first drying zone in the transport direction, and the second drying zone. The coating drying apparatus according to any one of claims 1 to 5 , further comprising a supply unit.

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