JPH04141231A - Ultraviolet irradiation apparatus - Google Patents

Abstract

PURPOSE:To obtain the title apparatus capable of uniformly cooling the surface of a work by providing a plurality of cooling pipes and providing a plurality of blowoff orifices inclined with respect to the surface of the work and blowing out cooling air. CONSTITUTION:A large number of blowoff orifices 6 inclined with respect to the surface of a work 1 and blowing out cooling air are formed to the under surfaces of cooling pipes 5 at predetermined intervals in two rows in opposed relation to the surface of the work 1. Since the directions of cooling air blown out to the surface of the work 1 from the blowoff orifices 6 are inclined with respect to the surface of the work 1, the area of the cooling air impinging against the surface of the work 1 becomes wide and the width of each of cooling lines becomes large. The cooling air streams blown out of the adjacent cooling pipes 5 collide each other and are supplied to the surface of the work 1 as turblent air and, therefore, the cooling lines further become obscure and the temp. difference due to the parts of the work 1 is reduced and the work can be uniformly cooled.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention relates to an ultraviolet irradiation device that irradiates ultraviolet rays in order to cure a resin layer applied to the surface of a workpiece, for example, and particularly relates to The present invention relates to an ultraviolet irradiation device having a cooling means for cooling a workpiece irradiated with ultraviolet rays.

(Prior art) For example, when curing a resin layer coated on the surface of a workpiece by irradiating it with ultraviolet rays, the workpiece is usually placed on a moving conveyor and passed under multiple ultraviolet lamps to perform the curing process. I am doing it.

An example of this type of conventional ultraviolet treatment equipment is shown in Figures 4 and 5.
As shown in the figure. In FIG. 4, a workpiece 1 placed on a moving conveyor (not shown) moves in the direction of arrow A. A plurality of ultraviolet lamps 2 are arranged on the upper part of the conveyor at approximately equal intervals perpendicular to the direction of movement of the conveyor. Further, on the upper part of the ultraviolet lamp 2, reflecting plates 3 each having an arcuate cross section are arranged parallel to the lamp axis direction.

On the other hand, a duct 4 for supplying cooling air is provided parallel to the conveyor line, and a cooling pipe 5 disposed in parallel between each lamp 2 is connected to the duct 4. As shown in FIG. 5, the cooling pipe 5 has a plurality of cooling air outlets 6 formed directly downward, and the cooling air is blown out perpendicularly to the work surface.

According to the conventional ultraviolet irradiation device described above, the air outlets 6 are formed in the cooling pipe 5 so as to be scattered at a predetermined pitch, so that only the portion of the work surface immediately below the air outlets 6 is strongly cooled. As a result, the work surface on the moving conveyor has
As shown in FIG. 6, a linear cooling line 7 appears. In addition, the cooling air may suck up nearby dirt, causing dirt to form along the cooling line 7.

Note that this type of cooling device is disclosed in Japanese Patent Application Laid-Open No. 51-1288.
As described in Publication No. 54, a housing having an air passage with a U-shaped cross section connected to a cooling duct is provided between the ultraviolet lamps, and cooling air outlets at the lower end of the housing are inclined toward the work surface. There is a known device that blows out cooling air. However, according to this proposal, a housing with a complicated shape must be provided, resulting in an increase in cost.

(Problems to be Solved by the Invention) As described above, according to the conventional ultraviolet irradiation device shown in FIGS. 4 and 5, the cooling air outlet 6 provided in the cooling pipe is formed to face directly below. Since the cooling air is blown out perpendicularly to the workpiece surface, there is a problem in that linear cooling lines and dirt are formed on the moving workpiece surface.

The present invention has been made in view of the above points, and an object of the present invention is to provide an ultraviolet irradiation device that has a simple structure and is capable of uniformly cooling a work surface.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention includes an ultraviolet lamp that irradiates the surface of a workpiece with ultraviolet rays, and a cooling air that blows cooling air to the workpiece that has been irradiated with the ultraviolet rays. In the ultraviolet irradiation device, a plurality of the cooling pipes are provided, and each of the cooling pipes is provided with a plurality of outlets that blow out the cooling air at an angle with respect to the work surface. It is characterized by

(Function) According to the above configuration, since the direction of the cooling air blown out from the outlet to the work surface is inclined with respect to the work surface, the surface of the cooling air that hits the work surface is expanded and the width of the cooling line becomes thick. Moreover, since the cooling air blown from adjacent cooling pipes collides with each other and is sent as turbulent air onto the work surface, the cooling line becomes even more unclear and uniform cooling can be achieved.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 and 2. FIG.

In these figures, parts corresponding to those of the conventional example shown in FIGS. 4 and 5 are designated by the same reference numerals, and the explanation thereof will be omitted as appropriate.

The feature of this embodiment lies in the cooling air outlet 6 provided in the cooling pipe 5, and the structure of the other parts is the same as that of the conventional model. On the lower surface of the cooling vibrar, a plurality of pairs of blow-off ports 6, which blow out cooling air at an angle with respect to the work surface, are formed in two opposing rows at predetermined intervals.

According to this embodiment, since the direction of the cooling air blown out from the outlet 6 toward the workpiece surface is inclined with respect to the workpiece surface, the surface of the cooling air that hits the workpiece surface is expanded and the width of the cooling line is increased. In addition, the cooling air blowing out from adjacent cooling pipes 5 collides with each other and is sent as turbulent air onto the work surface, making the cooling line even more unclear, reducing temperature differences between parts of the work, and making it more uniform. Can be cooled. As a result, it is also possible to scatter the dust that is drawn in by the cooling air.

In the above embodiment, a case has been described in which a plurality of opposing pairs of cooling air outlets 6 are provided in the cooling pipe 5, but the cooling air outlets 6 may be arranged in a staggered manner as shown in FIG. .

Further, when the thickness of the workpiece 1 is thin and the temperature difference between the front and back surfaces is small, the cooling pipe 5 may be provided on the side of the workpiece 1 opposite to the fluorescent lamp 2. In this case, the printed surface formed on the surface of the worm 1 will not be contaminated, and cooling will be more uniform.

Furthermore, the cooling pipe 5 may be provided only at the inlet or outlet in the workpiece conveyance direction A. Furthermore, a large number of cooling pipes 5 may be provided only at the outlet portion.

[Effects of the Invention] As explained above, according to the present invention, the cooling pipe that supplies the cooling air to cool the workpiece irradiated by the ultraviolet irradiation device is provided with the cooling air inclined with respect to the workpiece surface. Since multiple air outlets are provided, the workpiece surface can be uniformly cooled with a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the ultraviolet irradiation device according to the present invention, FIG. 2 is a bottom view showing the cooling pipe of FIG. 1, and FIG. 3 is a cooling pipe according to another embodiment of the present invention. Fig. 4 is a perspective view showing an example of a conventional ultraviolet irradiation device, Fig. 5 is a bottom view showing the cooling pipe of Fig. 4, and Fig. 6 similarly shows cooling lines formed on the work surface. FIG. 1... Work 2... Ultraviolet lamp 5...
・Cooling pipe 6...Cooling air outlet Agent Patent attorney Book 1) Takashi Figure 5 Figure 6

Claims (1)

[Claims] In an ultraviolet irradiation device equipped with an ultraviolet lamp that irradiates the surface of a workpiece with ultraviolet rays and a cooling pipe that sends cooling air to the workpiece that has been irradiated with the ultraviolet rays, a plurality of the cooling pipes are provided, and these cooling pipes are provided. An ultraviolet irradiation device characterized in that a plurality of blow-off ports for blowing out the cooling air are provided at an angle with respect to the work surface.