JPH07171473A - Device for coating outer face of circular body with ultraviolet curing paint - Google Patents

Abstract

PURPOSE:To make the whole device compact and to save the equipment space by alternately arranging a zone wherein plural UV irradiating lamps for curing a UV curing paint are circularly arranged in the verical direction and a zone wherein the lamps are circularly arranged in the horizontal direction. CONSTITUTION:A circular body 1 such as steel tube and steel bar with the outer face coated with a UV curing paint in a coating booth is successively transported into No.1 and No.2 zone UV irradiation booths, and the paint is dried and cured. Plural UV irradiating lamps 3 held by a holder 4 consisting of a U groove and a transparent lid are arranged concentrically with the position through which the body 1 is passed in each booth and supported by a rack 5. The plural UV lamps 3 are circularly arranged in the vertical direction in No.1 zone and in the horizontal direction in No.2 zone. Consequently, the distance between the bodies 1 is reduced, and the line is shortened in the width and longitudinal directions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for coating an ultraviolet-curable coating material on the outer surface of a circular body for preventing the outer surface of steel products such as steel pipes from rusting.

[0002]

2. Description of the Related Art Steel products such as steel pipes for piping have an anticorrosive coating on the outer surface for the purpose of preventing rust during storage in a warehouse or temporary storage at a construction site. As a rust preventive paint, an ultraviolet curable paint is often used because of its excellent weather resistance and good appearance. And, for example, in Japanese Patent Publication No. 2-11313,
As shown in FIGS. 5 and 6, the holders 3 of the ultraviolet irradiation lamps 2 are arranged at equal intervals in the housing 4 along the tube circumference of the tube-shaped body 1, and the irradiation surfaces of the adjacent ultraviolet irradiation lamps are mutually arranged. It is described that the UV curable coating material applied to the outer surface of the tubular body is uniformly cured by overlapping.

[0003]

In the conventional method for curing the ultraviolet curable coating material as described above, since the ultraviolet irradiation lamps are arranged in an annular shape, in the case of a coating apparatus in which a plurality of circular bodies are arranged in parallel, they are adjacent to each other. Since the distance between the lines and the distance between the lines are increased, the width of the entire device is expanded, the size of the device is increased, and there is a problem that it is insufficient to cope with a small space.

The present invention has been made to solve such a problem, and even if a plurality of circular bodies are arranged in parallel,
It is an object of the present invention to obtain a coating device for ultraviolet curable paint on the outer surface of a circular body that can be installed compactly without expanding the installation space.

[0005]

According to the present invention, there is provided an apparatus for coating an ultraviolet curable coating on an outer surface of a circular body, wherein ultraviolet irradiation lamps for curing the ultraviolet curable coating applied on the outer surface are vertically fed in parallel. The zones arranged in an arcuate shape in the vertical direction and the zones arranged in an arcuate shape in the left-right direction are alternately arranged.

[0006]

In the present invention, the width of the ultraviolet irradiation device for curing the paint applied to the outer surface of the adjacent circular bodies is narrowed and the distance between the adjacent circular bodies is reduced, so that the circular bodies are vertically fed in parallel. Even if the number of threads is increased, the degree of width expansion of the device is small, and the extension of the distance in the longitudinal direction of the line is also small, so that the installation space of the entire device can be reduced and the equipment scale can be made compact.

[0007]

【Example】

Example 1. FIG. 1 is an explanatory diagram showing the configuration of an apparatus for coating an ultraviolet curable coating material on the outer surface of a circular body according to an embodiment of the present invention in a state where ultraviolet irradiation lamps are vertically arranged in an arc shape. In the figure, 1 is a circular body, which is a metal body represented by a steel pipe, a steel bar and the like. An ultraviolet irradiation lamp 3 is arranged concentrically with a position where the circular body 1 passes. Reference numeral 4 denotes a holder, which has a space formed by a U-shaped groove and a transparent lid, and stores and protects the ultraviolet irradiation lamps 3 and arranges them. Reference numeral 5 denotes a mount, which is made of steel or the like and has high rigidity, and supports the holder 4. Since the ultraviolet irradiation lamps 3 arranged in the above state are not arranged on the lateral sides of the plurality of circular bodies 1, the intervals between the circular bodies 1 can be narrowed. Figure 2
Is an explanatory view showing a configuration in which the ultraviolet irradiation lamps 3 are arranged in an arc shape in the left-right direction of the circular body 1 in the center. Since the ultraviolet irradiation lamps 3 are not arranged on the lateral sides of the circular bodies 1 on both sides, The space between the features 1 can be reduced. FIG. 3 is an explanatory view showing a configuration in which two sets of the ultraviolet irradiation lamps 3 are arranged in a circular arc shape in the left-right direction so as to be spaced apart from each other. The interval between the circular bodies 1 can be narrowed. FIG. 4 is an explanatory diagram showing the line configuration. A coating booth 6 is a coating device for coating the outer surface of the circular body 1 with an ultraviolet curable coating (the coating nozzle is not shown).
Is stored. 7 is the No. 1 zone ultraviolet irradiation booth, which stores the one shown in FIG. Reference numeral 8 is a No. 2 zone ultraviolet irradiation booth, which stores the one shown in FIG. 9 is
No.3 zone UV irradiation booth, the one in Fig. 3 is stored. Reference numeral 10 is a transport roll, and 11 is a pinch roll, which vertically feeds the circular body 1 while supporting the circular body 1 at a predetermined position. 12 The ultraviolet curable coating material applied to the outer surface of the circular body 1 is squeezed by the ironing device to form a uniform coating film thickness.
Therefore, since the booths of No. 1 zone ultraviolet irradiation booth 7 and No. 2 zone ultraviolet irradiation booth 8 which are sequentially arranged after the coating booth 6 can be shortened, the extension of the distance in the longitudinal direction of the line is small. The installation space of the entire device can be reduced and the equipment scale can be made compact.

In the apparatus for coating the ultraviolet curable coating material on the outer surface of the circular body constructed as described above, first, the circular body 1 is vertically fed in parallel by the conveying rolls 10 and the pinch rolls 11 in the coating booth 6. An ultraviolet curable coating is applied to the outer surface to a desired thickness. In the coating booth 6, the outer surface is coated with the ultraviolet curable coating material to a desired thickness, and the circular body 1 is moved to the No. 1 zone ultraviolet irradiation booth 7 and the coating material in the vertical direction on the outer surface is irradiated by the ultraviolet rays irradiated from the vertical direction. It is hardened positively.
Next, the circular body 1 is moved to the No. 2 zone ultraviolet irradiation booth 8 and the coating material in the lateral direction on the outer surface is positively cured by the ultraviolet rays which are irradiated from the lateral direction of the circular body 1 in the center. And circular body 1 moved to No. 3 zone UV irradiation booth 8
The ultraviolet rays applied to the circular bodies 1 on both sides in the left-right direction positively cure the paint in the left-right direction on the outer surface. As a result, a coating film having a uniform film thickness is formed on the outer surface of the circular body 1 so as to effectively prevent corrosion. The invention of the present application is not limited to the above-described embodiment, and can be applied to, for example, a case where a large number of three or more circular bodies 1 are arranged in parallel. Other appropriate design changes can be made without departing from the object of the present application.

[0009]

As described above, according to the present invention, the apparatus for coating a plurality of circular bodies in parallel can be shortened in both the width direction of the line and the length direction of the line, thus making the entire apparatus compact. It is also possible to save equipment space, which leads to reduction of equipment cost.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of zones in which ultraviolet irradiation lamps of an apparatus for coating an ultraviolet curable coating material on an outer surface of a circular body according to an embodiment of the present invention are arranged in an arc shape in a vertical direction.

FIG. 2 is an explanatory diagram showing a configuration of zones in which ultraviolet irradiation lamps of a coating device for ultraviolet curable coating material on an outer surface of a circular body according to an embodiment of the present invention are arranged in an arc shape in a left-right direction.

FIG. 3 is an explanatory view showing a zone in which two sets of ultraviolet irradiation lamps of a coating device for an ultraviolet curable coating material on the outer surface of a circular body according to one embodiment of the present invention are arranged in an arc shape in the left-right direction so as to be spaced apart from each other.

FIG. 4 is an explanatory diagram showing a line configuration of a coating device for an ultraviolet curable coating material on the outer surface of a circular body according to an embodiment of the present invention.

FIG. 5 is a front cross-sectional view showing an arrangement state of a conventional ultraviolet irradiation lamp.

FIG. 6 is a side sectional view showing an arrangement state of a conventional ultraviolet irradiation lamp.

[Explanation of symbols]

 1 circular body 3 ultraviolet irradiation lamp 4 holder 5 stand 6 coating booth 7 No. 1 zone ultraviolet irradiation booth 8 No. 2 zone ultraviolet irradiation booth 9 No. 3 zone ultraviolet irradiation booth 10 transport roll 11 pinch roll 12 ironing device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yama ▲ saki ▼ Ichio 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Shoichi Sakai Nakata-cho, Izumi-ku, Yokohama-shi, Kanagawa 617-9

Claims (1)

[Claims] 1. A zone in which ultraviolet irradiation lamps for curing an ultraviolet-curable coating material applied to the outer surface are arranged in an arc shape in the vertical direction of a circular body that is vertically fed in parallel with a plurality of threads, and to the left and right. An apparatus for coating a UV-curable paint on the outer surface of a circular body, characterized by alternately arranging zones arranged in an arc shape in the direction.