JP2001121065A - Heating furnace for powder coating of automotive body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent separation and dropping of a powder coating material by stably forming a half-baked coating film by evenly heating an automotive body and a powder coating material in a heating furnace for powder coating of an automotive body comprising a transportation means for transporting an automotive body coated with a powder coating material in the outer face except the bottom part, a hot wind supplying means for supplying a hot wind to make the powder coating on the outer face of the automotive body be a half baked coating film and a booth in which these means are installed. SOLUTION: A hot wind supply means 9 comprises duets 14 in both sides of a transportation means 8, first nozzles 15 for blowing hot wind toward open windows 5c in both sides of an automotive body 5, and second nozzles 16 for blowing hot wind toward the bottom part 5b of the automotive body 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body powder for heating a vehicle body having a powder coating applied to the outer surface excluding a bottom portion to form a half-baked coating film on the outer surface of the vehicle body. The present invention relates to a heating furnace for body coating.

[0002]

2. Description of the Related Art Conventionally, such a heating furnace for powder coating is already known, for example, from JP-A-8-299888.

[0003]

However, in the above-mentioned prior art, hot air is directly blown onto the powder coating adhering to the outer surface of the vehicle body, thereby increasing the temperature of the powder coating and the vehicle body. Due to the difference in time, a half-baked coating film cannot be formed stably by heat-melting treatment of the powder coating material. In addition, due to the blowing of hot air onto the powder coating which is not in a stable half-baked state, the powder coating may peel off from the outer surface of the vehicle body and fall.

[0004] The present invention has been made in view of the above-mentioned circumstances, and uniformly raises the temperature of an automobile body and a powder coating to form a stable half-baked coating film.
An object of the present invention is to provide a heating furnace for powder coating of an automobile body, which can prevent falling.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 comprises a conveying means for conveying an automobile body having a powder coating applied to an outer surface excluding a bottom, and the conveying means comprises: Hot air supply means for supplying hot air for converting the powder paint on the outer surface of the car body to be conveyed into a half-baked coating film, wherein the hot air supply means is provided in a booth, A first nozzle for blowing hot air toward opening windows provided on both sides of the vehicle body in ducts arranged on both sides of the transporting means, and a second nozzle for blowing hot air toward the bottom of the vehicle body. Are provided.

According to such a configuration, the hot air blown out from the first nozzle of the hot air supply means is introduced into the vehicle body through the opening window and heats the vehicle body from the inner surface side. The hot air blown out from the second nozzle of the means heats the vehicle body against the bottom of the vehicle body where the powder coating is not adhered, so that there is no large difference in heating time between the vehicle body and the powder coating. Thus, the powder coating is heated and melted, and a stable half-baked coating film can be formed on the outer surface of the vehicle body. In addition, it is possible to prevent the hot air from directly hitting the powder paint as much as possible, and to prevent the powder paint from peeling and falling from the outer surface of the vehicle body as much as possible.

[0007] The invention according to claim 2 provides the above-described claim 1.
In addition to the configuration of the invention described in the above, the first plurality of first nozzles formed in a vertically extending slit shape are provided at first equally-spaced positions along the direction of transport of the vehicle body by the transport means. A second plurality of second nozzles provided in the duct and formed in a vertically extending slit shape are provided in the duct at positions spaced at second equal intervals along the transport direction. According to such a configuration, as the vehicle body is transported in the booth along the transport direction of the transport means, the vehicle body and the powder coating will gradually rise in temperature, and the half-baked coating film can be more stably formed. It can be formed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on one embodiment of the present invention shown in the attached drawings.

FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a vertical sectional front view of a heating furnace, and FIG. 2 is a view taken along line 2-2 of FIG.

First, in FIG. 1, the heating furnace 6 includes an automobile body 5 having an outer surface 5a excluding a bottom portion 5b and having a powder coating applied thereto.
Is heated to form a half-baked coating film by heating and melting the powder paint adhered to the outer surface 5a, and is provided in the booth 7 so as to transport the booth 7 and the vehicle body 5. Conveying means 8, hot air supplying means 9 provided in booth 7 for supplying hot air to the vehicle body 5 conveyed by conveying means 7, booth 7
Hot air recovery means 1 for collecting and circulating hot air inside
0.

The booth 7 is fixed on a gantry 11,
The transport means 8 includes a rail 12 laid on the floor 7 a of the booth 7, and a truck 13 moving along the rail 12, and the vehicle body 5 is positioned and mounted on the truck 13.

The hot air supply means 9 includes a first plurality of first nozzles 15 and a second plurality of first nozzles 15 arranged on a pair of ducts 14, 14 arranged on both sides of the conveying means 8 and attached to both inner side surfaces of the booth 7. The two nozzles 16 are provided respectively.

Referring also to FIG. 2, the first plurality of first nozzles 15... Blow hot air toward opening windows 5 c, 5 c provided on both sides of the vehicle body 5, respectively. A second plurality of second nozzles 16 are provided at the top.
Is provided below the duct 14 so as to blow hot air toward the bottom 5 b of the vehicle body 5.

Moreover, each of the first nozzles 15 is formed in a vertically extending slit shape so that the first equal intervals L1 are spaced from each other along the transport direction 17 of the vehicle body 5 by the transport means 8. Are provided in the duct 14 and each second
The nozzles 16 are formed in a slit shape extending vertically, and are provided in the duct 14 so as to leave a second equal interval L2 along the transport direction 17 therebetween.

A supply duct 18 disposed below the booth 7 is disposed on the gantry 11.
4 are connected in common to the supply duct 18. The supply duct 18 is connected to a heating means and a blower (not shown), and hot air is introduced from the supply duct 18 into a lower portion of the ducts 14, 14.

The distance from the supply duct 18 to each of the first nozzles 15 is greater than the distance from the supply duct 18 to each of the second nozzles 16. The hot air blows the first nozzle 15
The hot air introduced from the supply duct 18 into the ducts 14, 14
... is greater than the pressure loss that occurs before reaching. Thus, the opening area and the first regular interval L1 of each first nozzle 15... And the opening area and the second regular interval L2 of each second nozzle 16. The first and second nozzles 15..., 16 are set so that a desired amount of hot air is blown out.

The hot air recovery means 10 is provided with the ducts 14 and 1.
A plurality of third collection ports 2 are provided in a pair of collection ducts 19, 19 which are disposed above the
.. Are provided, and the collection ducts 19 are connected to a suction port of a blower connected to the supply duct 18.

Next, the operation of this embodiment will be described. The hot air supply means 9 is provided on the ducts 14, 14 arranged on both sides of the transport means 8, with the opening windows 5 on both sides of the vehicle body 5.
and a second nozzle 16 that blows hot air toward the bottom 5b of the vehicle body 5, and a first nozzle 15 that blows hot air toward the bottom 5b of the vehicle body 5 is provided.
Are introduced into the vehicle body 5 through the opening windows 5c, 5c to heat the vehicle body 5 from the inner surface side, and the hot air blown out from the second nozzles 16 is Auto body 5 without body paint
The vehicle body 5 is heated at the bottom 5b of the vehicle body. Thereby, the car body 5 and the outer surface 5 of the car body 5
It is possible to heat and melt the powder coating without causing a large difference in the temperature rise time of the powder coating attached to a.
A stable half-baked coating film can be formed on the outer surface 5a of the vehicle body 5. In addition, it is possible to prevent the hot air from directly hitting the powder coating material as much as possible, and to prevent peeling and falling of the powder coating material from the outer surface 5a of the vehicle body 5 as much as possible.

A first plurality of first nozzles 15 formed in a vertically extending slit shape are ducted at a position at a first equal interval L1 along a transport direction 17 of the vehicle body 5 by the transport means 8. The second plurality of second nozzles 16 which are provided on the duct 14 and formed in a vertically extending slit shape are provided on the duct 14 at positions spaced at a second equal interval L2 along the transport direction 17. As the car body 5 is conveyed in the booth 7 along the conveyance direction 17, the car body 5 and the powder paint gradually rise in temperature,
A half-baked coating film can be formed more stably.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

[0021]

As described above, according to the first aspect of the present invention, the powder coating is heated and melted so as not to cause a large difference in the heating time between the automobile body and the powder coating, and the stable half-bake coating is performed. The film can be formed on the outer surface of the automobile body, and the powder paint can be prevented from coming off the outer surface of the automobile body as much as possible by minimizing the direct exposure of the powder paint to hot air.

According to the second aspect of the present invention, as the vehicle body is transported in the booth along the transport direction of the transport means, the temperature of the vehicle body and the powder coating are gradually increased, and the half-baked coating film is formed. It becomes possible to form more stably.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a heating furnace.

FIG. 2 is a view taken in the direction of arrows 2-2 in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 5 ... Car body 5a ... Outer surface 5b ... Bottom part 5c ... Opening window 6 ... Heating furnace 8 ... Transportation means 9 ... Hot air supply means 7 ... Booth 14 ... Duct 15 1st nozzle 16 2nd nozzle 17 ... conveyance direction

Claims (2)

[Claims] 1. A transport means (8) for transporting an automobile body (5) having a powder coating applied to an outer surface (5a) excluding a bottom (5b), and the automobile transported by the transport means (8). Hot air supply means (9) for supplying hot air for making the powder coating on the outer surface (5a) of the vehicle body (5) into a half-baked coating film;
In a heating furnace for powder coating of an automobile body provided in a booth (7), the hot air supply means (9) is provided in a duct (14) arranged on both sides of the transport means (8). 5) a first nozzle (15) for blowing hot air toward an opening window (5c) provided on both sides, and a second nozzle (16) for blowing hot air toward a bottom (5b) of the vehicle body (5). And a heating furnace for powder coating of an automobile body. 2. A first plurality of first nozzles (15) formed in a vertically extending slit shape are provided in the first direction along a transport direction (17) of the vehicle body (5) by the transport means (8). The second plurality of second nozzles (16), which are provided in the duct (14) at equally spaced positions and are formed in a vertically extending slit shape, are arranged in the transport direction (17).
At a second equally spaced position along the
The heating furnace according to claim 1, wherein the heating furnace is provided in (4).