JP6428298B2 - Paint drying apparatus and paint drying method - Google Patents

Description

  The present invention relates to a paint drying apparatus and a paint drying method.

  In the car body painting line, various types such as electrodeposition coating, intermediate coating and top coating, and rust prevention treatment are performed with lids such as doors and hoods attached to the body shell body for the purpose of productivity improvement and color matching. Processing is performed. In intermediate coating and top coating, the vehicle body to be coated is placed on the coating carriage, the coating is applied while being transported through the painting booth, and then the automobile body is loaded together with the painting carriage into the coating drying furnace. Then, the wet coating film is baked and dried. The coating drying apparatus used in the painting line is provided with a hot-air supply duct in a tunnel-shaped drying furnace body, blows hot air over the entire automobile body transported in the drying furnace body, and burns and dries the wet coating film ( Patent Document 1).

Japanese Patent Publication No. 6-225

  Bake curable coatings are used for automobile bodies. For example, in the case of intermediate coating or top coating, holding at 140 ° C. for 20 minutes is the standard for quality assurance of cured coatings. However, in the conventional paint drying apparatus, hot air does not easily flow into a narrow portion such as around the hinge of the door due to the structure of the automobile body, compared to the outer plate portion where hot air is easily blown. For this reason, there is a problem that it is difficult to satisfy the quality assurance standard such as holding at 140 ° C. × 20 minutes for the narrow portion.

  The problem to be solved by the present invention is to provide a coating / drying apparatus and a coating / drying method capable of satisfying the drying conditions of the wet coating film over the entire automobile body.

  The present invention solves the above-mentioned problem by including a suction portion directed toward the narrow portion and suction means for sucking air in a range directed by the suction portion through the suction portion.

  According to the present invention, the operation of the suction means causes the hot air in the drying furnace body to flow toward the narrow portion of the automobile body directed by the suction port, and an air flow is generated in which the narrow portion and the hot air are in contact with each other. Thereby, drying of the coating film applied to the narrow portion is promoted, and predetermined drying conditions can be satisfied.

It is a whole process figure showing an example of the painting line to which one embodiment of the top coat painting drying device and method concerning the present invention is applied. It is a whole process figure which shows the other example of the coating line to which one embodiment of the top coat drying apparatus and method which concerns on this invention is applied. It is a side view which shows the state which mounted the motor vehicle body which concerns on 1st Embodiment of this invention in the coating trolley | bogie. It is the front view which looked at the front door of the automobile body concerning a 1st embodiment of the present invention from the room inner side. It is the front view which looked at the rear door of the automobile body concerning a 1st embodiment of the present invention from the room inner side. It is sectional drawing which follows the 2D-2D line | wire of FIG. 2A, Comprising: It is sectional drawing which shows an example of the narrow part containing a front pillar, a front door, and a hinge. It is sectional drawing which follows the 2E-2E line | wire of FIG. 2A, Comprising: It is sectional drawing which shows an example of the narrow part containing a center pillar, a rear door, and a hinge. It is a disassembled perspective view which shows an example of the hinge of FIG. 2B and FIG. 2C. It is the figure which looked at the state where the front door of the automobile body concerning a 1st embodiment of the present invention was opened from the back of a body shell main part. It is a side view showing the schematic structure of the top coat drying device concerning a 1st embodiment of the present invention. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a plane perspective view showing the schematic structure of the 1st suction unit concerning a 1st embodiment of the present invention. It is side surface perspective drawing which follows the 5B-5B line | wire of FIG. 5A. It is a plane perspective view explaining arrangement of the 1st suction unit concerning a 1st embodiment of the present invention. It is a figure which shows the positional relationship of the suction opening and narrow part which concern on 1st Embodiment of this invention, and is a figure corresponded in sectional drawing which follows the 2D-2D line | wire of FIG. 2A. It is side surface sectional drawing which shows schematic structure of the top coat coating drying apparatus which concerns on 2nd Embodiment of this invention. It is a perspective view which shows schematic structure of the 2nd suction unit which concerns on 2nd Embodiment of this invention. It is a top view explaining arrangement of the 2nd suction unit concerning a 2nd embodiment of the present invention. It is a figure which shows the positional relationship of the suction opening and narrow part which concern on 2nd Embodiment of this invention, and is a figure corresponded in sectional drawing which follows the 2D-2D line | wire of FIG. 2A. It is a perspective view which shows an example of the door stopper jig | tool used with the top coat coating drying apparatus which concerns on one embodiment of this invention. It is sectional drawing which follows the 12B-12B line | wire of FIG. 12A, Comprising: It is sectional drawing which shows the mounting state of a door stopper jig | tool.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the following embodiments, the best embodiment of the present invention will be described by taking the top coat coating drying apparatus 1 to which the coating drying apparatus and the coating drying method of the present invention are applied as an example. However, the coating drying apparatus and the coating drying of the present invention will be described. The method can be applied to an intermediate coating drying device, an undercoating drying device (electrodeposition coating drying device), or an intermediate coating / top coating drying device described later, in addition to the top coating drying device.

  The top coat drying apparatus 1 of this embodiment is one of the apparatuses constituting the coating line PL, and dries the top coat film applied to the body shell B (also referred to as an automobile body B) mounted on the coating carriage 50. It is a device for baking on the automobile body B. In the following description, first, the outline of the automobile production line and the coating line PL will be described, and then the automobile body B and the top coat drying apparatus 1 will be described in detail.

  The automobile production line has four main lines: a press molding line PRL, a body assembly line (also referred to as a welding line) WL, a painting line PL, and a vehicle assembly line (also referred to as an outfitting line) ASL. It is composed of In the press molding line PRL, various panels constituting the automobile body B are respectively press-molded and conveyed to the vehicle body assembly line WL in the state of a single press. In the vehicle body assembly line WL, sub-assemblies are assembled for each part of the automobile body such as the front body, center floor body, rear floor body, and side body, and welding is performed on predetermined parts of the assembled front body, center floor body, and rear floor body. The underbody is assembled, and the side body and the roof panel are welded to the underbody to assemble the body shell main body B1 (referring to the body shell excluding the lid). Finally, lid parts such as a hood F, side doors D1 and D2, and a trunk lid T (or back door) assembled in advance are mounted on the body shell main body B1 via a hinge. Then, after passing through the painting line PL, it is conveyed to the vehicle assembly line ASL, and various automobile parts such as an engine, a transmission, a suspension device, and interior parts are assembled to the finished body shell.

  Next, the main structure of the coating line PL will be described. FIG. 1A and FIG. 1B are all process diagrams showing a coating line PL including a top coating drying apparatus to which the coating drying apparatus and method according to the present invention are applied. The coating line PL of the embodiment shown in FIG. 1A is a coating line by a three-coat three-bake coating method of undercoating, intermediate coating, and topcoating. On the other hand, in the coating line PL of the embodiment shown in FIG. 1B, the intermediate coating and the top coating are wet-on-wet in the same coating booth (the coating is applied on the uncured coating, the same applies hereinafter). This is a coating line by a 3-coat 2-bake coating method in which the intermediate coating film and the top coating film are simultaneously baked in the same coating drying furnace. Thus, the coating drying apparatus and method of the present invention can be applied to any of coating lines having different coating methods. In addition, this 3 coat 3 bake coating method and 3 coat 2 bake coating method are modified, and the 4 coat coating method in which the intermediate coating is applied twice, and the case where the top coating color is a special color with 2 tones are also used. The coating drying apparatus and method according to the present invention can be applied by modifying a part of a typical coating line PL. Hereinafter, the painting lines of FIGS. 1A and 1B will be described in parallel, but the same reference numerals will be given to common configurations, and description will be made with reference to the painting line of FIG. 1A. Both coatings of FIGS. 1A and 1B Differences between the lines will be described with reference to FIG. 1B.

  The coating line PL of the embodiment shown in FIG. 1A includes an undercoating process P1, a sealing process P2, an intermediate coating process P3, a water polishing process P4, an overcoating process P5, and a coating completion inspection process P6. In contrast, the coating line PL of the embodiment shown in FIG. 1B includes an undercoat process P1, a sealing process P2, an intermediate coating / top coating process P7, and a coating completion inspection process P6. That is, in the coating line PL of FIG. 1B, the two steps of the intermediate coating step P31 and the top coating step P51 shown in FIG. 1A are performed in one step of the intermediate coating / top coating step P71 of FIG. In addition, the two steps of the intermediate coating drying step P32 and the top coating drying step P52 shown in FIG. 1A are performed in one step of the intermediate coating / top coating drying step P72 of FIG. 1B. The intermediate coating / top coating process P7 of FIG. 1B will be described later.

  As shown in FIGS. 1A and 1B, the undercoat process P1 includes a pre-electrodeposition treatment process P11, an electrodeposition coating process P12, and an electrodeposition drying process P13. In the electrodeposition pretreatment process P11, the automobile body B (white body) transferred from the carriage of the vehicle body assembly line WL to the painting hanger (not shown) by the drop lifter D / L is transferred to a predetermined pitch by an overhead conveyor. It is continuously transported at a predetermined transport speed. The configuration of the automobile body B will be described later.

  Although not shown, the electrodeposition pretreatment process P11 generally includes a degreasing process, a water washing process, a surface adjustment process, a chemical conversion film forming process, a water washing process, and a draining process. The car body B that is carried into the painting line PL is attached with press oil, iron powder and other dust from welding in the press molding line PRL and the car body assembly line WL, so this is washed in the degreasing process and the water washing process. And remove. In the surface adjustment step, the surface adjustment agent component is adsorbed on the surface of the automobile body B, and the number of reaction starting points in the chemical conversion film forming step of the next step is increased. The adsorbed surface conditioner component becomes the core of the film crystal and accelerates the film formation reaction. In the chemical conversion film forming step, the chemical conversion film is formed on the surface of the automobile body B by immersing the automobile body B in a chemical conversion treatment solution such as zinc phosphate. In the water washing step and the water draining step, the automobile body B is washed with water and dried.

  In the electrodeposition coating process P12, the automobile body B that has been subjected to the pretreatment in the electrodeposition pretreatment process P11 is continuously transported at a predetermined pitch and a predetermined transport speed by an overhead conveyor. Then, the automobile body B is immersed in a ship-type electrodeposition tank filled with the electrodeposition paint, and a plurality of electrode plates provided in the electrodeposition tank and the automobile body B (specifically, having electric conductivity). Apply a high voltage to the paint hanger. Thereby, an electrodeposition coating film is formed on the surface of the automobile body B by the electrophoretic action of the electrodeposition paint. Examples of the electrodeposition paint include a thermosetting paint having an epoxy resin such as a polyamine resin as a base resin. As the electrodeposition paint, a cationic electrodeposition paint that applies a positive high voltage to the electrodeposition paint side is preferably used for rust prevention, but an anionic electrodeposition paint that applies a positive high voltage to the vehicle body B side. May be used.

  The automobile body B coming out of the electrodeposition tank in the electrodeposition coating process P12 is conveyed to the water washing process, and the electrodeposition paint adhering to the automobile body B is washed away using industrial water or pure water. At this time, the electrodeposition paint taken out from the electrodeposition tank at the time of unloading is also collected in this water washing step. At the stage where the water washing treatment is completed, an undried electrodeposition coating film having a thickness of about 10 μm to 35 μm is formed on the surface of the automobile body B and the bag structure. When the electrodeposition coating process P12 is completed, the automobile body B mounted on the coating hanger is transferred to the coating carriage 50 (described later with reference to FIG. 2A) by the drop lifter D / L. The drop lifter D / L installed between the electrodeposition coating process P12 and the electrodeposition drying process P13 shown in FIGS. 1A and 1B is installed between the electrodeposition drying process P13 and the sealing process P2. In the electrodeposition drying process P13, the automobile body may be transported in a state of being mounted on a paint hanger.

  In the electrodeposition drying process P13, the automobile body B mounted on the painting carriage is continuously conveyed by the floor conveyor at a predetermined pitch and a predetermined conveying speed. And it is baked and dried by holding a temperature of 160 ° C. to 180 ° C. for 15 minutes to 30 minutes, for example, so that a dry electrodeposition coating film having a film thickness of 10 μm to 35 μm is formed in the inner and outer plates and the bag structure part of the automobile body B. Is formed. In addition, from the electrodeposition drying process P13 to the coating completion inspection process P6, the coating carriage 50 on which the automobile body B is mounted is continuously conveyed by the floor conveyor, but the conveyance pitch and conveying speed of the coating carriage 50 in each process are as follows. According to the process. Therefore, the floor conveyor is constituted by a plurality of conveyors, and the conveyance pitch and conveyance speed in each process are set to predetermined values.

  In the present specification and claims, the term “paint” such as electrodeposition paint, intermediate coating and top coating refers to the liquid state before being applied to an object to be coated. The term “coating film” such as a film and a top coating film refers to an undried (wet) or dried state that has been applied to an object to form a film, and the two are distinguished.

  In the sealing process P2 (including the undercoat process and the stone guard coat process), the automobile body B on which the electrodeposition coating film has been formed is transported, and the purpose is to prevent rust or seam at the steel sheet joint or the steel plate edge. A vinyl chloride resin sealing material is applied. In the undercoat process, a vinyl chloride resin-based chipping resistant material is applied to the tire house and the floor of the automobile body B. In the stone guard coating process, a polyester-based or polyurethane-based resin chipping resistant material is applied to the lower part of the body outer plate such as a side sill, a fender, or a door. In addition, these sealing materials and chipping resistant materials are cured in a dedicated drying step or an intermediate coating drying step P32 described below.

  The intermediate coating process P3 of the coating line PL in FIG. 1A includes an intermediate coating process P31 and an intermediate coating drying process P32. In the intermediate coating process P31, the automobile body B on which the electrodeposition coating film is formed is conveyed to the intermediate coating booth, and in the intermediate coating booth, on the inner plate portion of the automobile body such as the engine room, the hood inner, the trunk lid inner, An inner plate coating paint to which a coloring pigment corresponding to the outer plate color of the vehicle is added is applied. Then, the intermediate coating is applied to the outer plate such as the hood outer, the roof, the door outer, and the trunk lid outer (or the back door outer) by wet-on-wetting on the inner plate coating film. The outer plate portion is a portion that can be seen from the outside of the finished vehicle that has finished the outfitting process, and the inner plate portion is a portion that cannot be seen from the outside of the finished vehicle.

  In the intermediate coating drying process P32 of the coating line PL in FIG. 1A, the automobile body B is conveyed to the intermediate coating drying apparatus. And an undried intermediate coating film is baked and dried by holding a temperature of 130 ° C. to 150 ° C. for 15 to 30 minutes, for example, and an intermediate coating of a film thickness of 15 μm to 35 μm is applied to the outer plate portion of the automobile body B A film is formed. In addition, a coating film for coating an inner plate having a film thickness of 15 μm to 30 μm is formed on the inner plate portion of the automobile body B. The inner plate paint and the intermediate paint are thermosetting paints using acrylic resin, alkyd resin, polyester resin or the like as a base resin, and may be either water-based paint or organic solvent-based paint.

  In the water-polishing process P4 of the painting line PL in FIG. 1A, the automobile body B that has been finished up to the intermediate coating process P3 is transported, and the surface of the intermediate coating film formed on the automobile body B using clean water and abrasives is removed. Grind. Thereby, the coating film adhesion between the intermediate coating film and the top coating film is improved, and the smoothness (coating skin and sharpness) of the top coating film on the outer plate portion is improved. This water research process P4 includes a water research drying process P41. In this water research drying process P41, the automobile body B passes through the draining and drying furnace, thereby drying the water adhering to the automobile body B.

  The top coating process P5 of the coating line PL in FIG. 1A includes a top coating process P51 and a top coating drying process P52. In the top coating process P51, the automobile body B that has finished the water research process P4 and the water research drying process P41 is transported. Then, in the top coat booth, the top coat base paint is applied to the outer plate portion of the automobile body B, and the top coat clear paint is applied to the outer plate portion of the automobile body B by wet on wet.

  The topcoat base paint and the topcoat clear paint are paints that use acrylic resin, alkyd resin, polyester resin, or the like as a base resin, and may be either water-based paints or organic solvent-based paints. The top coat base paint is applied after being diluted to about 80% by weight in consideration of the finish properties such as the orientation of the glitter pigment (solid content is about 20% to 40%). Is diluted to about 30% by weight and applied (solid content is about 70% to 80%). However, the top coating base paint generally has a coating solid content of 70% or more in a flash-off process after application (a stationary process in which the solvent spontaneously evaporates in the booth).

  The outer plate color of the automobile body B of the present embodiment is a metallic outer plate color including various bright pigments such as aluminum and mica, and the top coat base paint and the top coat clear paint are applied to the automobile body B. It is not limited to this. For example, the outer body color of the automobile body B may be a solid outer panel color. The solid outer plate color is a paint color that does not contain a luster pigment. In this case, the top coat base paint is not applied, and the top coat solid paint is applied instead of the top clear paint. As such a top coat solid paint, a base resin paint similar to the top coat base paint or the top coat clear paint can be exemplified.

  In the top coat drying process P52 of this embodiment, the automobile body B to which the top coat paint is applied in the top coat booth is conveyed to the top coat drying apparatus 1. In the top coat drying process P52, the automobile body B passes through the top coat drying apparatus 10 under conditions of 130 [° C.] to 150 [° C.] and 15 to 30 minutes, and the coating applied to the automobile body B is baked and dried. A top coat film is formed. In addition, the specific structure of the top coat drying apparatus 1 of this embodiment is mentioned later.

  The film thickness of the topcoat base coating film is, for example, 10 μm to 20 μm, and the film thickness of the topcoat clear coating film is, for example, 15 μm to 30 μm. When the outer plate color of the automobile body B is a solid outer plate color, the film thickness of the top coat solid coating film is, for example, 15 μm to 35 μm. Finally, the automobile body (painted body) that has been painted is transported to the coating completion inspection process P6, where various inspections for evaluating the appearance of the coating film, the sharpness, and the like are performed.

  On the other hand, in the coating line PL shown in FIG. 1B, instead of the intermediate coating process P3, the water polishing process P4 (including the water polishing drying process P41) and the top coating process P5 shown in FIG. P7 is provided. The intermediate coating / top coating step P7 of this embodiment includes an intermediate coating / top coating step P71 and an intermediate coating / top coating drying step P72.

  In the intermediate coating / top coating process P71 of the coating line PL shown in FIG. 1B, the automobile body B on which the electrodeposition coating film is formed is transported to the intermediate coating / top coating booth, and in the first half zone of the intermediate coating / top coating booth, the engine room -An inner plate coating paint to which a coloring pigment corresponding to the outer plate color of the vehicle is added is applied to an inner plate portion of an automobile body such as a hood inner or a trunk lid inner. Then, the intermediate coating is applied to the outer plate such as the hood outer, the roof, the door outer, and the trunk lid outer (or the back door outer) by wet-on-wetting on the inner plate coating film. Next, in the second half zone of the intermediate coating / top coating booth, the top coat base paint is applied to the outer plate portion of the automobile body B, and this top coat base coat is wet-on-wet, and the top coat clear paint is applied to the outer plate portion of the automobile body B. Is painted. That is, the inner coating, intermediate coating, top coating base and clear coating are all applied wet-on-wet and simultaneously baked and dried in one top coating drying oven. Note that the wet coating applied to the automobile body B after applying the intermediate coating or the top coating is applied in order to suppress problems caused by repeated application of the wet coating and deterioration in sharpness. A flash-off step for increasing the coating NV of the film may be provided. As in the coating line PL shown in FIG. 1A, the base plate coating paint, intermediate coating, top coating base and clear coating used in this embodiment are made of an acrylic resin, alkyd resin, polyester resin or the like as a base. It is a thermosetting paint used as a resin, and may be either a water-based paint or an organic solvent-based paint.

  Next, an example of the automobile body B applied to the painting line PL of the present embodiment will be described in detail with reference to FIGS. 2A to 2G. FIG. 2A is a side view showing a state where the automobile body B according to the embodiment of the present invention is mounted on the painting carriage 50, and FIG. 2B shows the front door D1 of the automobile body B according to the embodiment of the present invention. 2C is a front view of the rear door D2 of the automobile body B according to the embodiment of the present invention as viewed from the indoor side, and FIG. 2D is a cross section taken along line 2D-2D of FIG. 2A. FIG. 2 is a cross-sectional view showing an example of a narrow portion N1 including a front pillar B4, a front door D1, and a hinge H1, FIG. 2E is a cross-sectional view taken along line 2E-2E in FIG. 2A, and includes a center pillar B5, Sectional drawing which shows an example of the narrow part N2 containing the rear door D2 and the hinge H2, FIG. 2F is an exploded perspective view which shows an example of hinge H1, H2 of FIG. 2B and FIG. 2C, FIG. 2G is one Embodiment of this invention Flow of car body B according to An open state Todoa D1, a view from the rear of the body shell body.

  As shown in FIG. 2A, the automobile body B of the present embodiment includes a body shell main body B1, a hood F that is a lid part, a front door D1, a rear door D2, and a trunk lid T. A front door opening B2 and a rear door opening B3 are formed on both side surfaces of the body shell body B1. The front door opening B2 is an opening defined by the front pillar B4, the center pillar B5, the roof side rail B8, and the side sill B9 of the body shell main body B1. The rear door opening B3 is an opening defined by the center pillar B5, the rear pillar B10, the roof side rail B8, and the side sill B9 of the body shell main body B1. Hereinafter, the front door opening B2 and the rear door opening B3 are collectively referred to as door openings B2 and B3. The trunk lid T as a lid part shown in the figure may be a back door depending on the vehicle body B type.

  Since the automobile body B of the present embodiment is a four-door sedan vehicle type as shown in the figure, the side door D has a front door D1 and a rear door D2. In the case of a two-door sedan or a two-door coupe, only the front door D1 and the front door opening B2 are provided, and the rear door D2 and the rear door opening B3 are not provided. The front door D1 of this embodiment is disposed so as to correspond to the front door opening B2, and the rear door D2 is disposed so as to correspond to the rear door opening B3. The body shell body B1 in the present embodiment corresponds to an example of a vehicle body according to the present invention, and the side door D including the front door D1 and the rear door D2 in the present embodiment corresponds to an example of a side door according to the present invention. In the case of the above-described two-door sedan or two-door coupe, the front door D1 corresponds to an example of a side door according to the present invention.

  As shown in FIGS. 2B and 2D, the front door D1 is provided with hinges H1 at two upper and lower positions on the front end portion (the front side of the vehicle body B). Further, as shown in FIGS. 2C and 2E, the rear door D2 is provided with hinges H2 at two upper and lower positions on the front end (the front side of the vehicle body B). Although the hinges H1 and H2 for mounting the front door D1 and the rear door D2 on the body shell body B1 so as to be freely opened and closed are slightly different in shape, the basic structure is the same. Both hinges H1 are shown, and the other hinge H2 is not shown by attaching the corresponding reference numerals in parentheses.

  As shown in FIG. 2F, the hinge H1 has two hinge brackets H11 and H12 and a hinge pin H13. The hinge bracket H11 is attached to the inner panel of the front door D1 via a bolt (not shown), and the hinge bracket H12 is attached to the front pillar B4 of the body shell main body B1 via a bolt (not shown). The hinge pin H13 is inserted into the four holes of the two hinge brackets H11 and 12, and is fixed by caulking or press-fitting. Accordingly, the hinge brackets H11 and H12 are coupled so as to be rotatable around the hinge pin H13.

  In the vehicle body assembly line WL, the hinge pin H13 is inserted into the four holes of the two hinge brackets H11 and 12, and the subassembly parts of the hinge H1 fixed by caulking or press-fitting are assembled in advance, and this is carried into the final process. . Before mounting the front door D1 on the body shell main body B1, one of the hinge brackets H11 of the subassembly parts of the hinge H1 is bolted to the front door D1, and then the front door D1 is connected to the front door of the body shell main body B1. The opening B2 is set using a jig or the like, and the other hinge bracket H12 is bolted to the front pillar B4. Thereby, the front door D1 can be opened and closed by rotating around the hinge pin H13.

  Similarly, the hinge H2 has two hinge brackets H21 and H22 and a hinge pin H23 as indicated by the reference numerals in parentheses in FIG. 2F. The hinge bracket H21 is attached to the rear door D2 via a bolt (not shown), and the hinge bracket H22 is attached to the center pillar B14 of the body shell main body B1 via a bolt (not shown). The hinge pin H23 is inserted into the holes of the two hinge brackets H21 and 22 and fixed by caulking or press-fitting. Accordingly, the hinge brackets H21 and H22 are coupled so as to be rotatable around the hinge pin H23. That is, the rear door D2 can be opened and closed by rotating around the hinge pin H23. Hereinafter, the hinge H1 and the hinge H2 are collectively referred to as a hinge H. The hinge H in the present embodiment corresponds to an example of a hinge part according to the present invention.

  In the automobile body B of the present embodiment, as shown in FIGS. 2D, 2E, and 2G, narrow portions N1 and N2 having a narrow interval are formed between the body shell main body B1 and the side door D. Specifically, as shown in FIGS. 2D and 2G, a narrow portion N1 having a narrow interval is formed in the vicinity of the hinge H1 between the front pillar B4 of the body shell main body B1 and the front door D1, as shown in FIG. 2E. As shown, a narrowed portion N2 having a narrow interval is formed in the vicinity of the center pillar B5 of the body shell main body B1 and the hinge H2 between the rear door D2. In particular, in the vicinity of the hinges H1 and H2, regardless of whether the front door D1 or the rear door D2 is open / closed, the hinges H1 and H2 are obstructed so that hot air from the paint drying device 1 is difficult to flow around. It is hard to be heated compared with the outer plate part. Accordingly, it is difficult to maintain a predetermined temperature, which is a quality assurance standard for the coating film, for a predetermined time or longer. 2D and 2E indicate the range of top coating, and the symbol WS similarly indicates the side door D1 for sealing between the side doors D1, D2 and the door openings B2, B3. , D2 is a weather strip to be mounted. In particular, the coating range from the weather strip WS to the outdoor side is severe with respect to the rust environment, and is a part that requires coating quality such as adhesion of the coating film in addition to the quality of appearance. Hereinafter, the narrow portion N1 and the narrow portion N2 are collectively referred to as the narrow portion N.

  Returning to FIG. 2A, the automobile body B described above is transported from the electrodeposition drying process P13 to the coating completion inspection process P6 in FIGS. 1A and 1B while being mounted on the painting carriage 50. The painting cart 50 of the present embodiment is a rectangular frame in plan view, and is composed of a base 51 made of a rigid body capable of supporting the automobile body B, and four provided on the lower surface of the base 51. It has a wheel 54, two front attachments 52 and two rear attachments 53 provided on the upper surface of the base 51. The left and right front attachments 52 respectively support the left and right front under bodies B6 (front side members and the like) of the automobile body B, and the left and right rear attachments 53 are the left and right rear under bodies B7 (rear side members and the like) of the automobile body B. Support each. The automobile body B is horizontally supported by these four attachments 52 and 53. The four wheels 54 rotate along the rails 41 laid on the left and right sides of the transport conveyor 40.

  Next, the top coat drying apparatus 1 of this embodiment is demonstrated. 3 is a side view showing a schematic configuration of the top coat drying apparatus according to the first embodiment of the present invention, FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3, and FIG. 5A is the first embodiment of the present invention. FIG. 5B is a side perspective view along line 5B-5B in FIG. 5A, and FIG. 6 is a first suction unit 60 according to the first embodiment of the present invention. FIG. 7 is a diagram showing the positional relationship between the suction port 621 and the narrowed portion N according to the first embodiment of the present invention, and is a sectional view taken along line 2D-2D in FIG. 2A. It is an equivalent figure.

  As shown in FIGS. 3 and 4, the topcoat drying apparatus 1 of the present embodiment includes a drying furnace body 10, a hot air supply apparatus 20, and an exhaust apparatus 30. As shown in the side view of FIG. 3, the drying furnace body 10 of the present embodiment includes an ascending inclined portion 11 on the inlet side, a descending inclined portion 13 on the exit side, and an ascending inclined portion 11 and a descending inclined portion 13. It is a drying furnace having a mountain shape including a raised floor portion 12 therebetween. Further, as shown in the cross-sectional view of FIG. 4, the drying furnace is a rectangle having a ceiling surface 14, a pair of left and right side surfaces 15, 15 and a floor surface 16. In the side view of FIG. 3, the left side is the top coating setting zone at the end of the top coat booth TB and the inlet side of the drying furnace body 10, and the right side is the outlet side of the drying furnace body 10, and the automobile body B mounted on the coating carriage 50. Is conveyed forward from left to right in FIG. That is, the automobile body B transported in the top coat drying apparatus 1 of the present embodiment is transported in the left direction shown in FIG. 2A. Note that the present invention is not particularly limited to the above, and the automobile body B may be transported backward in the top coat drying apparatus 1.

  The height of the floor surface 16 of the raised floor 12 of the drying furnace body 10 is substantially the same as the height of the upper opening edge of the opening of the drying furnace body 10 and the upper edge of the opening of the outlet of the drying furnace body 10. Yes. Thereby, it can suppress that the hot air supplied to the high floor part 12 escapes from the entrance or exit to the drying furnace main body 10 outside. In addition, on the floor surface 16 of the drying furnace body 10, a transfer conveyor 40 is laid along the extending direction of the drying furnace body 10 to transfer the painting carriage 50 on which the automobile body B is mounted. In this embodiment, the drying furnace body 10 is a mountain type drying furnace, but may be a flat type drying furnace. The flat-type drying furnace is a drying furnace that is uniformly formed on a flat surface and does not have the upward inclined portion 11 on the inlet side and the downward inclined portion 13 on the outlet side. Such a flat drying furnace can reduce the capital investment cost as compared with the above-mentioned mountain drying furnace. The drying furnace body 10 in the present embodiment corresponds to an example of a drying furnace body according to the present invention.

  The hot air supply device 20 is a facility for supplying the generated hot air into the raised floor portion 12 of the drying furnace body 10, and as shown in FIG. 4, an air supply fan 21, an air supply filter 22, a burner 23, The air supply duct 24, the first hot air outlet 25, and the second hot air outlet 26 are provided. The air supply fan 21 is a facility for supplying air sucked from the outside to the inside of the raised floor portion 12 of the drying furnace body 10. The air supply filter 22 is connected to the primary side (air intake side) of the air supply fan 21, filters the air intake from the outside, and separates dust and the like. Thereby, clean air is sucked into the air supply fan 21. The burner 23 is connected to the secondary side (air discharge side) of the air supply fan 21 and heats the air discharged from the air supply fan 21 to a predetermined temperature. Thereby, the sucked air is supplied as hot air into the raised floor 12 of the drying furnace body 10.

  As shown in FIG. 4, the air supply duct 24 is disposed on the ceiling surface 14 and the left and right side surfaces 15, 15 of the high floor portion 12 of the drying furnace body 10 along the conveyance direction of the automobile body B. The first hot air outlet 25 and the second hot air outlet 26 are rectangular slits (a plurality of rectangular slits) formed at predetermined intervals along the extending direction of the air supply duct 24 disposed in the raised floor portion 12 of the drying furnace body 10. Opening) and, if necessary, a wind direction plate provided in the slit. The first hot air outlet 25 and the second hot air outlet 26 are provided so that the opening of each slit or the wind direction plate is directed toward the center of the drying furnace body 10, whereby hot air supplied by the air supply fan 21 is provided. Is sprayed onto the automobile body B transported in the drying furnace body 10. The hot air supply device 20 in the present embodiment corresponds to an example of the hot air generation means according to the present invention.

  As shown in FIG. 4, the exhaust device 30 is a facility for discharging the solvent evaporated in the drying furnace body 10 to the outside of the system, and includes an exhaust fan 31, an exhaust filter 32, an exhaust duct 33, and exhaust suction. And a mouth 34. The exhaust fan 31 is a device that sucks the hot air in the drying furnace body 10 and discharges it outside the system of the drying furnace body 10 or circulates it to the primary side of the hot air supply device 20. Controls the function of removing hot air pressure and adjusting hot air pressure. The exhaust filter 32 is provided on the secondary side (the side from which hot air is discharged) of the exhaust fan 31. Hot air is sucked by the exhaust fan 31, passes through the exhaust filter 32, is discharged outside the system, or returned to the hot air supply device 20. The exhaust duct 33 is provided on each of the left and right side surfaces 15 and 15 of the drying furnace body 10 along the conveyance direction of the automobile body B. The exhaust suction port 34 includes slits formed at predetermined intervals in the exhaust duct 33 disposed in the drying furnace body 10.

The above is the configuration common to the paint drying apparatus according to the present invention, and several embodiments of the present invention will be described below.
<< First Embodiment >>
The paint drying apparatus 1 according to the present embodiment includes a first suction unit 60, and the suction unit 60 is placed in a room of each automobile body B. The first suction unit 60 includes a suction device 61 and a flexible hose 62, as shown in FIGS. 5A and 5B. The suction device 61 includes a housing 611, a suction pump 612, a battery 613, a connection port 614, and an exhaust port 615.

  The housing 611 has a rectangular shape with a space inside, and has a sealed structure in which airtightness and liquid tightness are ensured in the space. Such a housing 611 is preferably made of a material having heat resistance and heat shielding properties. Since the material constituting the casing 611 has heat resistance, thermal deformation of the casing 611 is suppressed in the temperature atmosphere in the drying furnace body 10. Further, since the material constituting the housing 611 has a heat shielding property, malfunctions and failures of the suction pump 612 and the battery 613 accommodated in the housing 611 in the temperature atmosphere in the drying furnace body 10 are achieved. Is suppressed. Although it does not specifically limit as a specific example of the material which comprises such a housing | casing 611, For example, what heat-insulated material, such as glass wool, was wound around metal materials, such as steel.

  The suction pump 612 and the battery 613 are accommodated in the housing 611 as described above. The suction pump 612 has a drive source such as a DC motor, for example. The suction pump 612 is activated when electric power is supplied from the battery 613 to the DC motor via electric wiring (not shown). The suction pump 612 has an intake portion 612a that sucks air and an exhaust portion 612b that discharges the sucked air.

  The connection port 614 has a cylindrical shape and is connected to the suction portion 612a of the suction pump 612 accommodated in the housing 611 through the housing 611 via a conduit (indicated by a one-dot chain line in the drawing). ing. The connection ports 614 are provided at two locations on the upper surface of the housing 611, and the connection ports 614 and 614 are formed to protrude upward. Further, these connection ports 614 and 614 are open toward the outside at the upper ends thereof. By inserting these connection ports 614 and 614 into the flexible hose 62 and fixing them with a fixing band (not shown) or the like, the suction device 61 and the flexible hose 62 are connected.

  The exhaust port 615 has a cylindrical shape and is connected to the exhaust unit 612b of the suction pump 612 that passes through the housing 611 and is accommodated in the housing 611 via a conduit. The exhaust port 615 is provided on each of the pair of side surfaces of the housing 611. The respective exhaust ports 615 and 615 are formed so as to protrude from the side surface of the housing 611. The numbers and shapes of the connection port 614 and the exhaust port 615 are not particularly limited to the above.

  When the suction pump 612 is operated, the suction device 61 of the present embodiment sucks air from the connection port 614 side and sends out the sucked air toward the exhaust port 615. As a result, a range in which the connection port 614 is directed is locally negative pressure, and an airflow is generated in which air flows in the suction direction in the vicinity of the connection port 614. In the following description, “negative pressure” means that the outside of the drying furnace body 10 is at a lower pressure side than the atmospheric pressure, and the inside of the drying furnace body 10 is the drying furnace body. It means that it is on the low pressure side compared to the internal pressure of 10. The “suction device 61” in the present embodiment corresponds to an example of “suction means” in the present invention.

  The flexible hose 62 has, for example, a tubular shape having a bellows, and can be connected to the connection port 614 at one end as shown in FIGS. 5A and 5B, and externally at the other end. It has a suction port 621 that opens toward the front. The “suction port 621” in the present embodiment corresponds to an example of the “suction part” in the present invention.

  In the present embodiment, the flexible hose 62 is bent in the extending direction so that the suction port 621 can be easily directed to the narrow portion N. In addition, when the suction device 61 (specifically, the suction pump 612) is operated in a state where the flexible hose 62 is connected to the suction device 61 via the connection port 614, the inside of the flexible hose 62 becomes negative pressure. Even in this case, it is preferable that the outer shape of the flexible hose 62 has a rigidity that does not deform. Moreover, as a material which comprises the flexible hose 62, it is preferable that it has heat resistance. Thereby, the thermal deformation of the flexible hose 62 is suppressed under the temperature atmosphere in the drying furnace body 10. Although it does not specifically limit as a specific example of the material which comprises such a flexible hose 62, For example, metal materials, such as steel, etc. can be illustrated.

  In the top coat drying apparatus 1 of this embodiment, as shown in FIG. 9, in the setting zone (see FIG. 3) at the end of the top coat booth TB on the upstream side of the drying furnace body 10, the robot, automatic machine, or operator's hand The first suction unit 60 is arranged in the room of the automobile body B by the work. In the present embodiment, one first suction unit 60 is arranged for the narrowed portions N1, N1 formed at two left and right sides of the gap between the front door D1 and the body shell main body B1, and the rear door D2 and the body shell main body are arranged. One first suction unit 60 is arranged for the narrow portions N2 and N2 formed at the two left and right sides of the gap with B1. The side door D of the automobile body B is slightly opened so that the width of the existing drying furnace does not increase, and the opening degree is fixed by the door stopper jig 100. The door stopper jig 100 shown in FIGS. 12A and 12B is attached to the hole B91 and the flange B92 of the side sill B9 so that the side door D contacts the part hidden by the fitting parts of the door inner panel so that it does not close to the closing limit. It is a jig. Incidentally, the side door D may be in an open state or a closed state. Further, when the side door D is opened, the opening angle is not particularly limited. In addition, when conveying the vehicle body B, the width | variety of a drying furnace can be made small by making the side door D into the closed state, and reduction of capital investment is achieved.

  At this time, as shown in FIGS. 6 and 7, the opening is directed from the interior side of the vehicle body B to the narrow portion N of the gap between the body shell main body B1 and the side door D by a robot, an automatic machine, or an operator's manual work. The suction port 621 is arranged so as to do so. The suction port 621 is preferably disposed in the vicinity of the narrow portion N. After the first suction unit 60 is disposed in the interior of the automobile body B, the automobile body B is transported into the drying furnace body 10 by the transport conveyor 40. And in the drying furnace main body 10, the motor vehicle body B and hot air contact, and the drying of the coating film apply | coated to the said motor vehicle body B is accelerated | stimulated.

  In this embodiment, as shown in FIGS. 6 and 7, the suction port 621 is directed to the narrowed portion N, and the suction pump 612 is operated in this state, whereby the suction port 621 including the narrowed portion N is directed. The range becomes negative pressure, and an air flow is generated in which hot air flows from the outside (lower side in the figure) of the automobile body B through the narrow portion N toward the suction port 621. The hot air is sucked into the suction device 61 (specifically, the suction pump 612) through the suction port 621, and the hot air further flows into the narrow portion N that becomes negative pressure. As a result, the hot air flowing toward the suction port 621 and the narrow portion N continuously contact each other, and the narrow portion N is heated. The hot air sucked by the first suction unit 60 is exhausted into the vehicle body B. The hot air exhausted into the interior of the automobile body B is diffused into the drying furnace main body 10 through the opening of the door window portion of the side door D or the like.

  In addition, while the automobile body B is being transported through the drying furnace body 10, it is preferable that the suction pump 612 is in an activated state. The power supply operation of the suction pump 612 may be performed manually by a robot, an automatic machine, or an operator when the first suction unit 60 is disposed in the room of the automobile body B. After the first suction unit 60 is transported into the drying furnace body 10 together with the automobile body B, the power may be automatically turned on.

  After the automobile body B passes through the drying furnace body 10, a first suction is performed by a robot, an automatic machine, or an operator's manual work in an operator zone (see FIG. 3) provided on the downstream side of the drying furnace body 10. Unit 60 is recovered.

  According to the top coat drying apparatus 1 of the present embodiment, the following operational effects are obtained.

  Due to its structure, the automobile body B is mostly configured to include a part that is easily hit by hot air and a part that is hard to hit. For example, even if the narrow portions N1, N2 in the vicinity of the hinges H1, H2 of the side door D are flowed to the top coat drying apparatus 1, hot air does not easily flow around and it is difficult to raise the temperature. For this reason, if the temperature rise time is set so that the narrow portion N does not meet the predetermined quality assurance standard and satisfies the quality assurance standard of the coating film applied to the narrow portion N, the coating drying furnace becomes longer and the capital investment increases. Invite.

  On the other hand, in the present embodiment, the operation of the suction device 61 causes hot air in the drying furnace body 10 to flow toward the narrow portion N of the automobile body to which the suction port 621 is directed, and the narrow portion N and the hot air are in contact with each other. An air current is generated. Thereby, drying of the coating film applied to the narrow portion is promoted, and the temperature raising time of the narrow portion N is shortened. As a result, it is possible to satisfy predetermined drying conditions for the narrow portion and to prevent the drying furnace body 10 from becoming long, thereby reducing the capital investment. Moreover, space saving of the coating line PL is achieved by suppressing the lengthening of the drying furnace body 10.

  Further, in the present embodiment, by operating the suction device 61, an air flow in which the narrow portion N and the hot air are continuously in contact is generated, so that the narrow portion N is easily heated and applied to the narrow portion N. Drying of the coated film is accelerated. Thereby, the drying condition of the coating film of the narrow part N does not satisfy the quality assurance standard, and so-called baking sweetness is generated, and the deterioration of the coating film quality such as the coating film performance deterioration and the coating film peeling is suppressed. Can do.

<< Second Embodiment >>
FIG. 8 is a side sectional view showing a schematic configuration of the top coat drying apparatus 1B according to the second embodiment of the present invention, and FIG. 9 is a perspective view showing a schematic configuration of the second suction unit 70 according to the second embodiment of the present invention. FIGS. 10 and 10 are plan views for explaining the arrangement of the second suction unit 70 according to the second embodiment of the present invention. FIG. 11 shows the positions of the suction port 741 and the narrowed portion N according to the second embodiment of the present invention. It is a figure which shows a relationship and is a figure corresponded in sectional drawing which follows the 2D-2D line | wire of FIG. 2A.

  The topcoat drying apparatus 1B according to the second embodiment of the present invention includes a drying furnace main body 10, a hot air supply device 20, an exhaust device 30B, and a second suction unit 70. Since the drying furnace body 10 and the hot air supply device 20 in the present embodiment are the same as those in the first embodiment, the same reference numerals are given and the description thereof is omitted.

  The exhaust device 30B of the present embodiment includes an exhaust fan 31, an exhaust filter 32, an exhaust duct 33B, and an exhaust suction port 34. Since the exhaust fan 31, the exhaust filter 32, and the exhaust suction port 34 in this embodiment are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

  As shown in FIG. 8, the exhaust duct 33 </ b> B of the present embodiment extends in the conveyance direction of the automobile body B, and is provided along the left and right side surfaces 15 on the floor surface 16 side of the drying furnace body 10. . In the present embodiment, air supply ducts 24 and 24 are provided above the exhaust ducts 33B and 33B, respectively. These exhaust ducts 33 </ b> B and 33 </ b> B are connected to a flexible duct 72 described later in the drying furnace body 10.

  As shown in FIG. 8, the second suction unit 70 of the present embodiment is provided so as to replace a part of the exhaust ducts 33 </ b> B and 33 </ b> B along the left and right side surfaces 15 of the drying furnace body 10. It has been. These second suction units 70, 70 include a suction box 71, a flexible duct 72, a traveling unit 73, and a flexible hose 74. Two suction boxes 71 (four in total) are provided for each second suction unit 70 on one side. As illustrated in FIG. 9, the suction box 71 includes a housing 711, a connection port 712, and a flange 713. The housing 711 has a rectangular tube shape and has a space inside. The housing 711 is open on the upstream side and the downstream side, and the upstream opening and the downstream opening communicate with each other through the space in the housing 711. The connection port 712 has a cylindrical shape and penetrates the housing 711 and communicates with a space in the housing 711. The connection port 712 is provided on a surface of the housing 711 facing the automobile body B. The suction box 71 and the flexible hose 74 are connected by inserting the connection port 712 into the flexible hose 74 and fixing it with a fixing band (not shown). The flange 713 is provided corresponding to the upstream opening and the downstream opening of the housing 711. The flange 713 can be connected to a flange 721 (described later) of the flexible duct 72. The “suction box 71” in the present embodiment corresponds to an example of “suction means” in the present invention.

  The flexible duct 72 has a rectangular tube shape having a bellows, and has flanges 721 at both ends. The flexible duct 72 is connected to the flange 713 of the suction box 71 at one end via a flange 721 and connected to the exhaust duct 33B at the other end. In this embodiment, two suction boxes 71 and 71 are arranged for each second suction unit 70 on one side, and the suction boxes 71 and 71 are connected by a flexible duct 72.

  The flexible duct 72 can be expanded and contracted along the transport direction in accordance with the advancement and retreat of the suction box 71 while maintaining the connection state between the suction box 71 and the exhaust duct 33B. Further, when the exhaust fan 31 is operated with the exhaust fan 31 and the flexible duct 72 connected via the exhaust duct 33B, the inside of the flexible duct 72 becomes negative pressure. It is preferable that the outer shape has rigidity that does not deform.

  The material constituting the flexible duct 72 preferably has heat resistance, and thereby, thermal deformation of the flexible duct 72 is suppressed in the temperature atmosphere in the drying furnace body 10. Although it does not specifically limit as a specific example of the material which comprises such a flexible duct 72, For example, metal materials, such as steel, etc. can be illustrated.

  The traveling units 73 are provided on the bottom surfaces of the housings 711 of the respective suction boxes 71, and four wheels 731 are slidable with a guide rail (not shown) disposed in the drying furnace body 10 along the conveyance direction. Is engaged. Moreover, the traveling unit 73 has a drive motor (not shown), and thus the suction box 71 can advance and retreat in the drying furnace body 10 along the transport direction. The flexible hose 74 can be connected to the connection port 712 of the suction box 71 at one end, and has a suction port 741 that opens toward the outside at the other end. The “traveling unit 73” in the present embodiment corresponds to an example of “following means” in the present invention, and the “suction port 741” in the present embodiment corresponds to an example of “suction unit” in the present invention.

  In the top coat drying apparatus 1B of the present embodiment, a flexible hose 74 is connected to each of the four suction boxes 71 as shown in FIG. The suction port 741 of each flexible hose 74 has four narrow portions N (two narrow portions N1 and narrow portions N2) formed between the body shell body B1 and the side door D from the outside of the automobile body B. Are arranged so that the openings are oriented at two locations.

  When the vehicle body B passes in front of the second suction unit 70, the suction box 71 is placed in the vehicle body B (specifically, the painting cart 50 so as to keep the distance between the suction port 741 and the narrow portion N constant. ) And run parallel. The trigger for starting the parallel running may be when the coating carriage 50 turns on a detector such as a limit switch provided at a predetermined position. The suction box 71 is connected to the exhaust fan 31, and by the operation of the exhaust fan 31, the range in which the suction port 741 including the narrowed portion N is directed becomes negative pressure, and from the inside of the automobile body B (upper side in the figure). An air flow in which hot air flows through the narrow portion N toward the suction port 741 is generated. The hot air is sucked into the suction box 71 (specifically, the exhaust fan 31) through the suction port 741, and the hot air further flows into the narrow portion N that becomes negative pressure. As a result, the hot air flowing toward the suction port 741 and the narrow portion N are continuously in contact with each other, and the narrow portion N is heated. In the interior of the automobile body B, hot air enters from the door window opening of the side door D.

  When the suction box 71 reaches the downstream end of the section where the second suction unit 70 is provided, the suction box 71 stops parallel movement with the car body B being conveyed. Then, the suction box 71 returns to the upstream end, which is the initial position, and waits until the next vehicle body B to be transported passes in front of the second suction unit 70.

  According to the top coat drying apparatus 1B of the present embodiment, the following operational effects are obtained.

  The top coat drying apparatus 1B in the present embodiment can achieve the same effects as the top coat drying apparatus 1 in the first embodiment.

  Moreover, in this embodiment, the capital investment can be suppressed by connecting the second suction unit 70 to the existing exhaust device 30B.

  Moreover, in this embodiment, the installation location of the 2nd suction unit 70 is made into the one part area in the drying furnace main body 10, and the location which moves in the said drying furnace main body 10 decreases, and the drying furnace main body is reduced. The scattering of dust in 10 is suppressed.

  Further, in the present embodiment, by arranging the suction port 741 in the vicinity of the narrow portion N, volatile substances generated from the coating film to be dried can be immediately exhausted to the outside of the drying furnace body 10. Thereby, it is suppressed that a volatile substance re-condenses (condenses) in the drying furnace main body 10 and drops on the automobile body B, and further, deterioration of the quality of the automobile body B is suppressed.

  In the present embodiment, the distance between the suction port 741 and the narrow portion N is kept constant by providing the traveling unit 73 in the suction box 71 and running in parallel with the automobile body B. However, the present invention is not limited to this. . For example, the suction port 741 (free end) side of the flexible hose 74 may be connected to a moving unit that advances and retracts along the transport direction, and the suction port 741 is advanced and retracted by the moving unit according to the position of the automobile body B being transported. Good. In this case, the suction box 71 is directly connected to the exhaust duct 33B, and the flexible duct 72 becomes unnecessary. In this case, the number of movable parts in the drying furnace body 10 is further reduced, and the scattering of dust in the drying furnace body 10 is further suppressed.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

PRL ... Press molding line WL ... Car body assembly (welding) line ASL ... Vehicle assembly (fitting) line PL ... Paint line P1 ... Undercoat process (electrodeposition process)
P11 ... Electrodeposition pretreatment process P12 ... Electrodeposition coating process P13 ... Electrodeposition drying process P2 ... Sealing process P3 ... Intermediate coating process P31 ... Intermediate coating process P32 ... Intermediate coating drying process P4 ... Water research process P41 ... Water research drying Process P5 ... Top coat process P51 ... Top coat coating process P52 ... Top coat drying process P6 ... Coating finish inspection process P7 ... Intermediate coating / top coating process P71 ... Intermediate coating / top coating coating process P72 ... Intermediate coating / top coating drying process D / L ... Drop lifter B ... Automobile body B1 ... Body shell body B2 ... Front door opening B3 ... Rear door opening B4 ... Front pillar B5 ... Center pillar B6 ... Front underbody B7 ... Rear underbody B8 ... Roof side rail B9 ... Side sill B10 ... Rear pillar B11 ... Front fender B12 ... Rear fender B13 ... Roof ... Hood T ... Trunk lid D ... Side door D1 ... Front door H1 (H) ... Hinge H11, H12 ... Hinge bracket H13 ... Hinge pin D2 ... Rear door H2 (H) ... Hinge H21, H22 ... Hinge bracket H23 ... Hinge pins N1, N2 ... Narrow part 1 ... Top coat drying apparatus 10 ... Drying furnace main body 11 ... Upward inclined part on inlet side 12 ... High floor part 13 ... Downward inclined part on outlet side 14 ... Ceiling surface 15 ... Side surface 16 ... Floor surface 20 ... Hot air supply Device 21 ... Air supply fan 22 ... Air supply filter 23 ... Burner 24 ... Air supply duct 25 ... Hot air outlet 30 ... Exhaust device 31 ... Exhaust fan 32 ... Exhaust filter 33 ... Exhaust duct 34 ... Exhaust air inlet 40 ... Conveyor 41 ... Rail 50 ... Painting truck 51 ... Base 52 ... Front attachment 53 ... Rear attachment 5 ... Wheel 60 ... First suction unit 61 ... Suction device 611 ... Housing 612 ... Suction pump 612a ... Intake part 612b ... Exhaust part 613 ... Battery 614 ... Connection part 615 ... Exhaust port 62 ... Flexible hose 621 ... Suction port 70 ... Second suction unit 71 ... Suction box 711 ... Housing 712 ... Connection part 713 ...・ Flange 72 ... Flexible duct 721 ... Flange 73 ... Running section 731 ... Wheel 74 ... Flexible hose 741 ... Suction port TB ... Top coat booth

Claims (8)

A hot air generated by the hot air generating means while the automobile body including a drying furnace main body and hot air generating means and including an outer plate part and a narrow part is being conveyed in the drying furnace main body, and the automobile body A coating and drying device for drying the coating applied to the outer plate portion and the narrow portion,
A suction portion that opens toward the narrow portion;
And a suction means for sucking air in a range directed by the suction portion through the suction portion. The paint drying apparatus according to claim 1,
The said suction part and the said suction means are the coating-drying apparatuses currently mounted in the room | chamber interior of the said motor vehicle body. The paint drying apparatus according to claim 1,
It further comprises follow-up means for causing the suction part to follow the position of the automobile body conveyed in the drying furnace body,
The suction part and the suction means are a coating and drying apparatus provided outside the automobile body and in the drying furnace body. The paint drying apparatus according to any one of claims 1 to 3,
The automobile body is
Body body,
A lid part assembled to the vehicle body, and
The narrowed portion is a paint drying device formed in a gap including a hinge portion between the vehicle body and the lid part. The paint drying apparatus according to claim 4,
The narrowed portion is a paint drying device that is a gap including a hinge portion of a side door. The paint drying apparatus according to claim 4 or 5,
The automobile body is a coating and drying apparatus that is transported through the drying furnace body with the lid parts closed. Using a paint drying device equipped with a drying furnace body and hot air generating means,
While the automobile body including the outer plate portion and the narrow portion is transported through the drying furnace main body, the hot air generated by the hot air generating means is brought into contact with the automobile body, and applied to the outer plate portion and the narrow portion. A coating drying method for drying a coated film,
A paint drying method comprising a suction step of sucking air in a range including the narrow portion from a suction portion opening toward the narrow portion. It is the paint drying method of Claim 7,
The suction step is a paint drying method in which air in a range including the narrow portion is sucked from either the indoor side or the outdoor side of the automobile body.

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