JP3034929B2 - Paint drying oven equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coating and drying furnace apparatus.

(Prior Art) A coating line generally includes a coating step of applying a paint to an object to be coated, and a baking step of baking and drying the paint applied in the coating step. Depending on the type of paint, for example, in the case of a thermosetting paint, a setting step of drying the paint at room temperature or a slightly higher temperature is provided between the painting step and the baking step.

By the way, JP-A-63-178871 discloses that in a coating process, a paint is applied to a thickness equal to or more than a sagging limit, and in a baking process, the object is rotated about a substantially horizontal axis to prevent sagging. It has been proposed to increase the thickness of the coating film to enhance the smoothness of the painted surface. When such a coating technique is put to practical use, as described in the above-mentioned publication, a transport trolley for transporting an object to be coated is provided with a rotating device for rotating the object to be coated about a substantially horizontal axis. That is, it is configured as a rotating cart. And the object to which the paint is applied to a thickness greater than the sag limit is
It passes through the baking / drying furnace while being held by the rotating cart.

(Problems to be Solved by the Invention) However, the rotating cart is extremely expensive as compared with a general cart having no rotating device. Taking into account the heating time of the car, in order to bake and dry one car,
Since it takes about 35 minutes, the baking drying oven becomes quite long,
The number of rotating carts required will be considerable. In this regard, some countermeasures are desired.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a coating / drying oven apparatus capable of minimizing the number of rotating carts required for baking and drying.

To achieve the above object, the present invention has the following configuration as a first configuration. That is, as described in claim 1 of the claims, a baking means for baking and drying the coating film of the paint formed on the object to be coated, and a predetermined conveying line passing through the baking means What is claimed is: 1. A coating / drying furnace apparatus provided with first and second transport carts for transporting an object to be coated, wherein the baking means comprises a first baking furnace and a second baking furnace; However, the endless type 1
A first transfer line passing through the first baking furnace but not passing through the second baking furnace; and a second transfer line including the second baking furnace. , But not passing through the first baking furnace, the first carrier is supported only on the first carrier line, circulates through the first carrier line, and has a substantially horizontal axis. Rotating means for rotating the object to be rotated around, wherein the second transport vehicle is supported only on the second transport line, and the object is applied to the second transport vehicle. Means for fixing and supporting, and connecting a downstream side of the first baking furnace and an upstream side of the second baking furnace to transfer an object to be coated from the first carriage to the second carriage. A moving device for mounting the moving object is provided on the first transport line, (1) On the upstream side of the baking furnace, there is provided a coating means for applying a paint to the object to be coated to a thickness not less than the sagging limit. While being conveyed by the one carriage, the paint is passed through the first baking furnace, and is cured in the first baking furnace until no dripping occurs. In the second baking furnace, the paint applied to the object to be coated is further reduced. Drying is performed. The first
Preferred embodiments based on the above configuration are as described in claims 2 to 7 in the claims.

To achieve the above object, the present invention has the following configuration as a second configuration. That is, as described in claim 8 in the claims, the spraying means for spraying the paint to the thickness of not less than the sagging limit on the article to be coated, and the spraying means for spraying the paint on the article to be coated. Baking means for baking and drying the coating film, and first and second transport carts for transporting the object to be coated on a predetermined transport line adjacent to the spraying means and passing through the baking means. A coating and drying furnace apparatus, wherein the baking means comprises a first baking furnace and a second baking furnace, wherein the transfer lines are a first transfer line and a second transfer line, each of which is an endless type. Wherein the first transfer line passes through the first baking furnace adjacent to the spraying means but does not pass through the second baking furnace, and the second transfer line is connected to the second baking furnace. Pass through the The first carrier is arranged so as not to pass through the baking furnace, and the first carrier transports the workpiece so as to circulate through the first transport line, and rotates the workpiece about a substantially horizontal axis. Rotating means for transporting the object to be passed through the second transport line, and fixing and supporting the object to be transported to the second transport vehicle. Means for connecting a downstream side of the first baking furnace and an upstream side of the second baking furnace to transfer an object to be coated from the first carriage to the second carriage. An apparatus is provided, and the object to which the coating material is applied to a thickness equal to or greater than the drip limit by the spraying means is passed through the first baking furnace while being conveyed by the first carriage, and in the first baking furnace, The paint is cured until no dripping occurs, and no dripping occurs in the second baking furnace. Further drying of the paint after it has been cured until it is complete is performed. Preferred embodiments on the premise of the second configuration are as described in claim 9 and the following claims.

By adopting such a configuration, only during the first half of the baking period when the coating material is liable to be dripped and the object to be coated needs to be rotated, the first drying oven is used by the first transporting cart serving as the rotating cart. Baking and drying are performed. Then, in the later stage of baking, in which the paint is no longer dripped even when the object is no longer rotated, the second carrier is used as a general carrier.
Baking drying is performed by a drying oven.

(Effect of the Invention) According to the present invention, the number of extremely expensive rotating carts can be reduced by at least the carts corresponding to the length passing through the second drying furnace, and the entire apparatus can be configured at low cost.

(Example) Hereinafter, an example of the present invention will be described with reference to the attached drawings.

1. Overall Configuration In FIG. 1, L1 is a first transport line, and the first transport line is sequentially provided with transfer stages along the transport direction.
An installation S2, a painting bush A, and a first baking / drying oven B1 are provided. The first transport line L1 is of an endless type, on which a rotating truck D1 travels as described later.

In the transfer station S2, the automobile body W as the object to be coated after the intermediate coating process is transferred to the intermediate coating transfer line.
From LM to the first transport line L1, that is, a rotating truck D1 described below.
Transferred to In the above-mentioned coating bush A, the top coat is sprayed on the body W after the intermediate coating. Is sprayed (generally, electrostatic atomization coating). The first drying oven B1 has a length corresponding to the time required for the top coating material sprayed to a thickness equal to or greater than the sag limit to harden until sagging no longer occurs. In the embodiment, the first drying furnace B1 is of a far-infrared type as described later. In the embodiment, the length of the first transfer line L1 between the coating bush A and the first drying furnace B1 is required for the setting step because the thermosetting coating is used as the top coating. The length is equivalent to time.

A second transport line L2 is provided independently and independently of the first transport line L1. The second transfer line L2 is of an endless type and is set so as to pass through the second baking / drying furnace B2. A transfer station S1 is configured in the second transport line L2 before the second drying furnace B2,
A transfer station S3 is configured downstream of the second drying furnace B2. A general carriage D2 having no rotating device runs on such a second transport line L2. The second drying furnace B2
Is longer than the first drying oven B1, and is a known hot air type in the embodiment.

In the coating line shown in FIG. 1, the body W after the intermediate coating has been completed is transported along a transport line LM by a general carriage, and is transferred to a first transport line at a transfer station S2.
It is transferred to the rotating cart D1 on L1. The body W transferred to the rotary cart D1 is first sprayed with a top coat (a thermosetting paint in the embodiment) to a thickness equal to or greater than the sag limit in a coating bush. After that, the first drying oven is
When passing through B1, the solvent in the paint is volatilized appropriately (setting). Upon entering the first drying furnace B1, baking and drying by far infrared rays is performed. During the passage through the first drying oven B1, the body W is rotated about a substantially horizontal axis (although it may be inclined at about 30 ° with respect to the horizontal axis, preferably at an angle of 10 ° or less). To prevent the paint from dripping. Then, immediately after passing through the first drying furnace B1, the paint is dried to such an extent that no more dripping occurs. Note that the body W may be rotated about a substantially horizontal axis before entering the first drying oven B1 (when there is a possibility that paint dripping may occur during setting).

Here, the rotation speed of the body W is set between a predetermined lower limit value and an upper limit value, and the lower limit value is such that at least a portion where the sagging is to occur before the sagging is changed from a vertical state to a horizontal state. The upper limit value is the largest rotation speed in a range where sagging does not occur due to centrifugal force caused by rotation. It is preferable that the upper limit value of the rotation speed be 380 cm / sec or more at the tip of the rotation. Further, the rotation of the body W may be continuous or intermittent rotation in one direction, or forward and reverse rotation in which the body W is rotated in one direction and then rotated in the opposite direction (this forward and reverse rotation may also be continuous). , May be intermittent).

When the rotating cart D1 reaches the transfer station S1, the body W on the rotating cart D1 is transferred to the general cart D2 running along the transport line L2. The baking drying is performed while the body W conveyed by the general carriage D2 passes through the second drying furnace B2, and when the body W comes out of the second drying furnace B2, the baking drying is completed.

The general carriage D2 exits the second drying furnace B2 and is transferred to the transfer station S3.
Then, the body W is transferred from the general trolley D2 on the transport line L2 to the general trolley on the assembly line LS, and is transported to a known assembly process.

General trolley The general trolley D2 has the same structure as that used in a normal coating line, and an example is shown in FIG. That is, the general trolley D2 has the base 71,
The base 71 is formed by using a traveling wheel 72 provided on the
It is free to travel on a rail 81 as a transfer line L2.
A support 73 is erected from the base 71, and through this support 73, the body W is held at its side sill by a general carriage D2.
Supported by In addition, the general trolley D2 is provided with a traveling driving force by a chain 82 connected to the base 71.

An example of the rotating truck D1 will be described together with a rotating jig.

First, a specific example of a jig used to support the body W so as to be rotatable in the horizontal direction with respect to the rotating cart D1 will be described.

FIG. 5 shows a front jig attached to the front of the body W.
Shows 1F. The jig 1F includes a pair of left and right mounting brackets 2, a pair of left and right stays 3 welded to the left and right brackets 2, a connecting bar 4 for connecting the pair of left and right stays 3, And a rotating shaft 5 integrated with the bar-4. In such a jig 1F, the bracket 2 is
A front strength member of the body W, for example, a front side frame
Fixed to the front end of the memory 11. That is, since a bracket 12 for mounting a bumper (not shown) is usually welded to the front side frame 11, the bracket 2 is bolted (not shown) to the bracket 12 on the body W side.
Use to fix.

On the other hand, the rear jig 1R attached to the rear of the body W
Is shown in FIG. The rear jig 1R has the same configuration as the front jig 1F, and the components corresponding to the front jig 1F are denoted by the same reference numerals. This rear jig
To attach the 1R to the body W, the bracket 2 is attached to the floor frame 13 as a strength member at the rear end of the body W.
By fixing with bolts. Of course, since a bumper mounting bracket is welded in advance to the rear end of the floor frame 13 because a bumper is generally mounted, the mounting of the rear jig 1R is performed using the bumper mounting bracket. Can also be performed.

When the jigs 1F and 1R are attached to the body W, the rotating shafts 5 are positioned on the same straight line extending in the front-rear direction of the body W. This same straight line becomes the rotation axis l of the body W. Preferably, this rotation axis l is the center of gravity G of the body W (see FIG. 7).
Through. It should be noted that the rotation axis l passes through the center of gravity G, thereby preventing a large fluctuation in the rotation speed when the body W rotates. This prevents the body W from receiving an impact due to the rotation fluctuation, which is more preferable for preventing dripping.

The front and rear jigs 1F and 1R are for the type of vehicle (the type of body W)
A special one is prepared in advance in accordance with.

In FIG. 7, the rotating cart D1 has a base 21, and wheels 22 mounted on the base 21 travel on a rail 23 as a transport line L1. The base 21 is composed of one front support 24, two intermediate supports 25, 2 extending upward from the front in the traveling direction to the rear (right to left in FIG. 7).
6, and one rear strut 27, and a space between the intermediate struts 25, 26 and the rear strut 27 is a strut space 28 which is largely spaced in the front-rear direction.

The body W is disposed in the support space 28, and the front portion thereof is rotatably supported on the intermediate support 26 using the front jig 1F, while the rear portion uses the rear jig 1R. Then, it is rotatably supported by the rear column 27.

The front and rear jigs 1F and 1R (the rotating shaft 5) can be freely disengaged from the columns 26 and 27 from above and below, and the rear jig is also provided.
1R is immovably engaged in the direction of the rotation axis l. For this reason, the notch 26a which opens in the upper end surface is formed in the intermediate support | pillar 26 (refer FIG. 10-12), The notch 27a which opens in the upper support surface is formed in the rear support | pillar 27. (First
FIG. 0, FIG. 14, FIG. 15). These two notches 26a, 27a
Is large enough to fit the rotating shafts 5 of the jigs 1F and 1R. The flange 5a is attached to the rotating shaft 5 of the rear jig 1R.
On the other hand, a notch 27b having a shape corresponding to the flange portion 5a communicating with the notch 27a is formed in the rear support column 27. As a result, the rear jig 1R has the notch
It is disengaged from the vertical direction with respect to 27a, 27b, and is immovable in the front-rear direction with respect to the rear support column 27 by the stopper action of the flange portion 5a. The application of the rotational force to the body W is performed via the rotary shaft 5 of the front jig 1F. Therefore, a connecting portion 5b to be described later is attached to the tip of the rotary shaft 5 of the front jig 1F.
(See also FIG. 5).

A stay 29 projects downward from the base 21, and a towing wire 30 is connected to a lower end of the stay 29. The wire 30 is of an endless type, and is driven in one direction by a motor (not shown), whereby the rotating carriage D1 is driven in a predetermined transport direction. Of course, the above-mentioned motor is installed in a safe place from the viewpoint of explosion protection.

In the embodiment, the rotation of the body W is performed by using the movement of the rotating cart D1, that is, by using the displacement of the rotating cart D1 with respect to the traveling road surface 23. The rotation extraction mechanism 31 for extracting the displacement of the rotation carriage D1 as rotation is configured as follows. That is, the rotation take-out mechanism 31 is a rotation shaft that extends vertically and is rotatably supported on the base 21.
32 and a sprocket 33 fixed to the lower end of the rotating shaft 32
And a chain 34 meshed with the sprocket 33. This chain 34 is arranged in parallel with the wire 30 so as to be immovable with respect to the traveling road surface 23. As a result, when the truck D is pulled through the wire 30, the chain 34 is immobile, so that the sprocket 33 meshing with the chain 34 and thus the rotating shaft 32 are rotated.

A transmission mechanism 35 for transmitting the rotation of the rotation shaft 32 to (the rotation shaft 5 of) the front jig 1F is configured as follows. That is, the transmission mechanism 35 includes a casing 36 fixed to the rear surface of the front support 24 and a rotating shaft 37 that extends in the lateral direction (front-rear direction) and is rotatably supported by the casing 36.
A pair of bevel gears 38 and 39 for interlocking the rotation shaft 37 and the upper rotation shaft 32, and a connection shaft 40 held rotatably and slidably in the front-rear direction with respect to the intermediate support 25. Have. The connecting shaft 40 is spline-coupled to the rotating shaft 37 (the engaging portion is indicated by reference numeral 41 in FIG. 7). When the rotating shaft 32 is rotated, the connecting shaft 40 is also rotated. become. Of course, the rotation shaft 37 and the connection shaft 40 are installed so as to be located on the rotation axis l.

The connecting shaft 40 is disengaged from the rotating shaft 5 of the front jig 1F. That is, as shown in FIGS. 10 to 12, a cross-shaped connecting portion 5b is formed at the tip of the rotary shaft 5 for the front jig 1F, while the connecting shaft 40 has As shown in FIGS. 10 and 13, a box portion 40a having an engagement recess 40c into which the connecting portion 5b is fitted without play is formed. Thus, for example, the rod 43 is
By sliding the connecting shaft 40 through the connector, the box portion 40a (engaging recess 40c) and the connecting portion 5b are disengaged, and the connecting shaft 40 and the rotating shaft 5 can be integrally rotated during the engagement. It is said. As shown in FIG. 10, the rod 43 is fitted into an annular groove 40b formed on the outer periphery of the box 40a so as not to hinder the rotation of the connecting shaft 40.

With the above-described configuration, the body W is lowered with respect to the rotating carriage D1 while the connecting shaft 40 is displaced to the right in FIG. 7, so that each of the rotating shafts 5 of the front and rear jigs 1F and 1R is moved.
Are rotatably supported by the intermediate supports 26 and 27 and are immovable in the front-rear direction. After this, the connecting shaft 40 (locking recess 40
c) is engaged with (the connection part 5b of) the rotating shaft 5 in the front jig 1F. Accordingly, if the rotating cart D1 is pulled through the wire 30, the body W will be rotated about the predetermined horizontal axis l. The bogie for rotating the body W
Removal from D1 may be performed in a procedure reverse to the procedure described above.

Transfer Device An example of a transfer device used at least in the transfer station S1 is shown in FIGS.

This transfer device is substantially constituted by a lifter 51. The lifter 51 includes a pair of left and right guide posts 52, a base 53 attached to each guide post 52 so as to be driven up and down, and support legs driven by the bases 53 so as to be able to expand and contract, respectively. And 54. Each of the support legs 54
Each has a pair of front and rear support portions 54a separated in the direction of movement of the cart.

In the above configuration, the rotating carriage D1 supporting the body W from the first transfer line L1 is moved to the transfer station.
Stopped at S1. When the rotation cart D1 is stopped, the support legs 54 are extended from the lowermost base 53, and then the base 53 is moved up. As a result, as shown in FIGS. 2 and 3, the body W on the rotating cart D1 is
Depending on a, side sill or floor frame of body W
While being supported by the rotating cart D1, it is raised to a high position. After this, for the second transport line
The general trolley D of L2 is located at the transfer station S1. Thereafter, the base 53 is lowered, and the body W is transferred to the general carriage D2. Then, the support leg 54 is contracted in preparation for the next transfer (see the dashed line in FIG. 2). In this way, the body W is transferred from the rotating cart '1 to the general cart D2.

When the body W is transferred, it is preferable that the carriage D1 or D2 be firmly fixed to a predetermined position in a stationary state by a positioning device or the like that clamps the carriage D1 or D2 from front to back and left and right directions. The transfer device has a hanger that is intermittently fed in a high place. After the transfer device is transferred to the hanger by the lifter 51, the body W is moved by the hanger to the second carriage D2 for the second transport line L2. The body may be moved upward, and the body may be transferred from the hanger to the general carriage D2 again by using the lifter at this position.

The above-described transfer device is similarly used for the transfer station S1 or S3.

First Drying Furnace An example of the first drying furnace B1 is shown in FIG. The first drying oven B1 has a main body 91 that defines a tunnel sized to allow the rotation cart D1 to pass therethrough, and a plurality of far-infrared panels 92 are attached to the inner wall of the main body 91. It has become something. By energizing this panel 92, the main body 91
The inside is heated to a predetermined temperature. Although the first drying furnace B1 may be a hot air type, far infrared rays are more advantageous from the following viewpoints. First, in a state where the paint is dripped, floating dust easily adheres to the surface of the paint. However, by using the far-infrared ray method, dust is generated due to heat generation. In addition, since it is not necessary to positively generate convection of air in the main body 91, it is advantageous in preventing adhesion of the dust. Second, the paint can be heated from the inside (from the plate surface side of the body W) to effectively volatilize the solvent in the paint.

Specific examples of coating conditions and drying conditions A Coating conditions (1) Undercoat paint Cathodic electrodeposition Baking: 170 ° C x 30 minutes Film pressure: 20 ± 2 µm (2) Intercoat a. Paint: Thermosetting oil-free polyester paint (gray B. Coating viscosity: 0.6poise c. Coating machine: Mini bell (bell diameter 60mm) Rotation speed 22000rpm Voltage-90KV Shaping air-pressure 3.0kg / cm ² Gun distance 30cm d. Drying condition: Setting 7 minutes (room temperature) Later, 140 ° C x 25
(3) Top coat a. Paint: thermosetting acrylic melamine paint (black) b. Coating viscosity: 0.6 poise c. Non-volatile content: 42% by weight (0.6 poise) d. Solvent: 50% by weight of toluene / 100% by weight of Solvesso 100 % E. Anti-sagging agent: Crosslinked acrylic resin powder (6% by weight based on nonvolatile content) f. Coating coater: Mini bell (bell diameter 60 mm: Nippon Landsuba)
Mini bell rotation speed: 16000 rpm Shaping pressure: 3 kg / cm ² Voltage: -90 KV Gun distance: 30 cm Interval 5 minutes when spraying twice B drying condition (for overcoating) (1) Setting process a. Setting start atmosphere temperature: 20 ° C ± 2 ° C b. Setting time: 10 minutes (2) First drying process (far infrared heating furnace) a. Furnace atmosphere temperature: 120 ° C b. Heating rate: 7 minutes (coating) (Temperature of the object: 20 ° C → 140 ° C) c. Drying time: 10 minutes (The time for the temperature of the object to rise from 20 ° C to 140 ° C is 7 minutes, and the time for keeping the object at 140 ° C) (3 minutes) (3) 1st drying process (hot air heating furnace) a. Atmosphere temperature in furnace: 150 ° C b. Heating rate: 15 minutes (temperature of coated object: 20 ° C → 140 ° C) c. Drying Time: 20 minutes (15 minutes for the temperature of the object to be raised from 20 ° C. to 140 ° C., and 5 minutes for maintaining the object at 140 ° C.) (4) Second drying step a. Atmospheric temperature: 150 ℃ b. Heating rate: 15 minutes ( (Temperature of substrate: 20 ℃ → 140 ℃) c. Drying time: 25 minutes

[Brief description of the drawings]

FIG. 1 is an overall process diagram showing one embodiment of the present invention. 2 and 3 show an example of the transfer device, FIG. 2 is a front view thereof, and FIG. 3 is a side view of FIG. FIG. 4 is a side view showing an example of a general carriage. 5 and 6 are perspective views showing examples of jigs used for rotating the body. FIG. 7 is a side view showing an example of a rotating cart. FIG. 8 is a partially cutaway plan view showing a state of the rotating carriage below the traveling path. FIG. 9 is a sectional view taken along line X9-X9 in FIG. FIG. 10 is a side cross-sectional view showing a connecting portion between the rotating jig and the rotating cart. FIG. 11 is a sectional view taken along the line X11-X11 in FIG. FIG. 12 is a plan view of FIG. FIG. 13 is a sectional view taken along line X13-X13 of FIG. FIG. 14 is a sectional view taken along line X14-X14 of FIG. FIG. 15 is a plan view of FIG. FIG. 16 is a front view showing an example of a first drying furnace. W: Body (object to be coated) L1: 1st transfer line L2: 2nd transfer line B1: 1st drying furnace B2: 2nd drying furnace D1: Rotary trolley D2: General trolley S1: Transfer station

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-63076 (JP, A) JP-A-1-7974 (JP, A) JP-A-1-63069 (JP, A) 126064 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05C 9/10-9/14 B05C 13 / 02,13 / 00 F26B 21 / 00,25 / 00,23 / 02 B05D 7/14 B05B 13/02

Claims (19)

(57) [Claims] 1. A baking means for baking and drying a paint film formed on an object to be coated, and a first means for transferring the object to be coated on a predetermined transfer line passing through the baking means. And a second drying carriage, wherein the baking means comprises a first baking furnace and a second baking furnace, and wherein each of the transfer lines is an endless type.
A first transfer line passing through the first baking furnace but not passing through the second baking furnace; and a second transfer line including the second baking furnace. , But not passing through the first baking furnace, the first carrier is supported only on the first carrier line, circulates through the first carrier line, and has a substantially horizontal axis. Rotating means for rotating the object to be rotated around, wherein the second transport vehicle is supported only on the second transport line, and the object is applied to the second transport vehicle. Means for fixing and supporting, and connecting a downstream side of the first baking furnace and an upstream side of the second baking furnace to transfer an object to be coated from the first carriage to the second carriage. A transfer device for mounting is provided, and the first transport line includes (1) On the upstream side of the baking furnace, there is provided a coating means for applying a paint to the object to be coated to a thickness not less than the sagging limit. While being conveyed by the one carriage, the paint is passed through the first baking furnace, and is cured in the first baking furnace until no dripping occurs. In the second baking furnace, the paint applied to the object to be coated is further reduced. A coating / drying oven apparatus wherein drying is performed. 2. The coating and drying furnace apparatus according to claim 1, wherein the first baking furnace has means for radiating infrared rays to the object to be coated. 3. The coating and drying furnace apparatus according to claim 1, wherein said first baking furnace has means for blowing hot air. 4. The apparatus according to claim 1, wherein said second baking oven has means for blowing hot air. 5. The apparatus according to claim 1, wherein the rotating means comprises: a supporting means for supporting the object to be rotatable; and a converting means for converting a linear displacement of the first carriage into a rotational displacement. And a transmission means for transmitting the rotational displacement converted by the conversion means to the object to be coated rotatably supported by the support means. apparatus. 6. The toothed rotator according to claim 5, wherein the converting means is rotatably mounted on the transport trolley, and is provided along the first transport line. A coating and drying furnace device, comprising: a long tooth-like body that can be meshed with a. 7. The coating and drying furnace apparatus according to claim 1, further comprising means for supporting the vehicle body to rotate about a substantially horizontal axis. 8. A spraying means for spraying a paint to a thickness exceeding a dripping limit on an object to be coated, and a printing means for baking and drying a coating film formed by spraying the paint on the object to be coated. A coating and drying furnace device comprising: a first and a second transport carriage for transporting an object to be coated on a predetermined transport line adjacent to the spraying means and passing through the baking means, Baking means is composed of a first baking furnace and a second baking furnace, and each of the transfer lines is an endless type first baking furnace.
A first transport line, wherein the first transport line is adjacent to the spraying means,
The second transfer line is arranged so as to pass through the baking furnace but not through the second baking furnace, and to pass through the second baking furnace but not through the first baking furnace; The one transport vehicle transports the workpiece so as to circulate through the first transport line, and includes rotating means for rotating the workpiece about a substantially horizontal axis. Means for conveying the object to be coated so as to pass through the second conveying line, and for fixing and supporting the object to be coated with respect to the second carrier, downstream of the first baking furnace. And an upstream of the second baking furnace, and a transfer device for transferring the object to be coated from the first transfer vehicle to the second transfer vehicle is provided. An object to which a coating material is applied to a thickness is transported by the first transporting cart while the first Passing through the baking furnace, and curing the paint in the first baking furnace until sagging does not occur, and further drying the paint after curing in the second baking furnace until sagging does not occur. Characteristic paint drying oven equipment. 9. The coating and drying furnace apparatus according to claim 8, wherein the first baking furnace has means for radiating infrared rays to the object to be coated. 10. The coating and drying furnace apparatus according to claim 8, wherein said first baking furnace has means for blowing hot air. 11. The coating and drying furnace apparatus according to claim 8, wherein said second baking furnace has means for blowing hot air. 12. The apparatus according to claim 8, wherein the rotating device is configured to: support means for rotatably supporting the object to be coated; and convert a linear displacement of the first transport carriage in the transport direction into a rotational displacement. And a transmitting means for transmitting the rotational displacement converted by the converting means to the object supported so as to be rotatable by the supporting means. And paint drying oven equipment. 13. The toothed rotary body according to claim 12, wherein the conversion means is provided along the first transport line, the toothed rotary body being rotatably mounted on the transport vehicle. And a long tooth-like body that can be engaged with the body. 14. The coating and drying furnace apparatus according to claim 8, further comprising means for supporting the vehicle body to rotate about a substantially horizontal axis. 15. The coating and drying oven device according to claim 14, wherein the substantially horizontal axis for rotating the vehicle body around the vehicle extends in the longitudinal direction of the vehicle body. 16. The paint drying apparatus according to claim 14, wherein said substantially horizontal axis for rotating said vehicle body therearound is disposed so as to pass substantially through the center of the center of gravity of said vehicle body. Furnace equipment. 17. An apparatus according to claim 8, wherein said spraying means comprises means for applying a top coat. 18. The apparatus according to claim 8, wherein said spraying means comprises an electrostatic spraying device for spraying paint. 19. The method of claim 8, wherein the spraying means is spaced apart from the baking means to allow the paint to substantially harden before entering the baking means. A coating and drying furnace apparatus characterized by the above-mentioned.