JPH0445864A - Method and device for coating inner surface of pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for painting the inner surface of a tube, and more particularly to a method and apparatus for painting the inner surface of a tube whose inner surface is coated with an ultraviolet curable paint.

[Conventional technology]

Conventionally, metal pipes such as cast iron pipes are provided with an inner lining for the purpose of preventing internal corrosion.

Mortar linings, resin linings, and the like are known as this inner lining, but inner linings made of ultraviolet curable paint are sometimes employed as inner linings with excellent adhesion strength and coating strength.

This inner lining requires UV irradiation to cure the coating film, so these irradiation devices are necessary.

[Problems with conventional technology]

By the way, the above-mentioned ultraviolet irradiation device generally places one or more ultraviolet lamps inside a parabolic reflecting plate and inserts the lamp directly into the tube to irradiate the ultraviolet rays. However, the above-mentioned ultraviolet irradiation lamp cannot be inserted into the pipe, and such a lining cannot be performed with a small diameter pipe, or even if it is possible, it is extremely difficult.

In particular, since ultraviolet irradiation lamps generate significant heat, a cooling device is required for the reflecting plate, etc., and this cooling device inevitably increases the size of the irradiation device, making it even more difficult to implement in small diameter tubes.

[Problem to be solved by the invention]

This invention has been made in view of the problems mentioned in section 2 above, with the object of providing a method and apparatus for painting the inner surface of a tube, which can easily perform inner lining using an ultraviolet curable paint even for small diameter tubes. .

[Technology that led to solving the problem]

That is, the tube inner surface coating method of the present invention focuses light from one or more ultraviolet irradiation lamps by reflection, guides the focused light beam into a tube coated with an ultraviolet curable paint, and directs the focused light beam inside the tube. The apparatus is characterized in that the ultraviolet curable paint is cured by irradiating ultraviolet rays while reflecting in the radial direction. A light collector having a cooling air circulation device, supported in a direction from which light is emitted from the light collector so that it can be viewed from or near the light collector, and having a diameter that is large enough to be inserted into a tube coated with an ultraviolet curable paint. It is characterized by comprising a directional light reflecting plate.

[Effect]

In this invention, the ultraviolet irradiation lamp is installed within a reflecting plate such as a paraboloid, and these are placed outside a tube whose inner surface is coated with anticorrosive ultraviolet curing paint.

Then, only the ultraviolet rays that are focused by the reflector and emitted to the outside are incident on the inner lining tube.

The ultraviolet rays irradiated into the tube are reflected in the radial direction by a reflector placed inside the tube and illuminate the inner surface of the tube.

Therefore, the paint is cured by this ultraviolet light.

〔Example〕

Next, the present invention will be explained in detail.

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view showing the usage state of the embodiment.

In the tube inner surface coating device 1 of the present invention, one or more ultraviolet lamps 3 are installed in a reflection plate 2 whose inner surface is made of aluminum foil or the like to have a silver mirror surface, and in the direction of light emission (direction of arrow X),
It is constructed by arranging a radial light reflecting plate 4 that can be inserted into a small diameter pipe P.

In the above, the offending plate 4 is a cone-shaped one as shown in FIG. 1, and a plate-shaped reflecting plate 4 as shown in FIG.
It may also be A. However, in this case, a device 4B for rotating the reflecting plate 4A around the axis is required.

Note that 5 in the figure indicates an air suction hose provided on the reflector plate 2 for cooling the lamp.

In the above, a condenser lens 6 may be provided at the light irradiation port to further improve the condensation of ultraviolet rays.

The pipe inner surface coating device 1 of the present invention is installed at the end of a pipe P as shown in FIG. irradiate to.

A reflecting plate 4 is placed inside the tube, and the ultraviolet rays are reflected in the radial direction by this reflecting plate, so that the ultraviolet curable paint applied to the inner wall of the tube is quickly cured.

In the case of the reflector plate 4A shown in FIG. 3, the arm 4C supporting the reflector plate 4A is rotated around the axis to uniformly irradiate the inner surface of the tube with ultraviolet rays.

〔effect〕

As explained above, according to the present invention, no matter how small the diameter of the tube, it is possible to line the inner surface with an ultraviolet curable paint as long as the tube can have a reflective plate inserted therein.

Furthermore, since the ultraviolet irradiation lamp is always placed outside the tube, it has various effects such as easy cooling and safe operation.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the invention, FIG. 2 is a sectional view showing the embodiment in use, and FIG. 3 is a sectional view of another embodiment.

Claims (2)

[Claims] (1) Collect light from one or more ultraviolet irradiation lamps by reflection, guide the focused light beam into a tube coated with ultraviolet curing paint, reflect the focused light beam in the radial direction inside the tube, and irradiate ultraviolet rays. A method for painting an inner surface of a pipe, comprising curing the ultraviolet curable paint. (2) A light condenser that is equipped with one or more ultraviolet irradiation lamps inside and has an air circulation device for cooling the ultraviolet irradiation lamps; What is claimed is: 1. A tube inner surface coating device comprising: a radial light reflecting plate that is supported by the radial light reflector and is large enough to be inserted into a tube coated with ultraviolet curable paint.