JPH08299884A - Squeeze device for pipe painting - Google Patents

Abstract

PURPOSE: To provide a squeeze device for a tubular material such as a steel pipe having an ultraviolet curable paint soln. applied to the outer peripheral surface thereof. CONSTITUTION: A pipe 2 is passed through the painting apparatus ranging from a pipe painting machine 3 to an ultraviolet irradiation means 11 by feed means 1a, 21, 1b. Therefore, the pipe 2 can be painted regardless of the length of the pipe while passed through the painting apparatus. A squeeze plate 22 having an opening part of a diameter smaller than that of the pipe 2 is provided in front of the feed means 21 and the distance between the coating layer of the pipe coated with paint in the painting machine and the squeeze plate 22 is shortened. A squeeze plate 23 having a diameter almost same as the outer diameter of the pipe is provided behind the feed means 21. By providing the squeeze plates 22, 23 before and behind the feed means 21 in combination, the pipe is smoothly passed through the painting apparatus and the dripping of paint after the coating in the painting machine 3 is prevented and film thickness can be made uniform and thin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squeezing device for a tubular material such as a steel pipe whose outer peripheral surface is coated with an ultraviolet curable coating liquid.

[0002]

2. Description of the Related Art A tubular material coated with an ultraviolet curable coating liquid on the outer peripheral surface of a pipe is passed through a box-shaped tank having an opening provided at the center and a squeeze ring attached along the opening to form a film thickness. Is adjusted to a thin thickness, and the coating film is cured by ultraviolet irradiation means for coating.

As an example thereof, there is a coating device disclosed in Japanese Patent Publication No. 62-54062. As shown in FIG. 5, this coating apparatus comprises means 1a and 1b for conveying a finite length tube 2 in its length direction, and slits or small holes or a combination thereof which are sequentially arranged along the tube conveying direction. A means (coating machine) 3 for supplying the ultraviolet curable coating liquid to the outer peripheral surface of the pipe in a curtain shape or a shower shape, and is movable in a direction parallel and at right angles to the conveying direction of the pipe, and the entire outer peripheral surface of the pipe. It comprises an ironing means 10 for forming a uniform thin film of the coating liquid applied on the substrate and an ultraviolet irradiating means 11 for hardening the coating liquid, and at least the above-mentioned squeeze mark between adjacent pipe conveying means 1a, 1b. Means 10 and ultraviolet irradiation means 11 are provided. In the coating liquid supply means 3, the coating liquid is discharged from the head 4 toward the pipe 2, and the surplus coating material is collected in the coating material tank 6 through the lower pan 5 and used through the filter 7, the pump 8 and the line 9. .

A plurality of irradiation sources 12 are evenly arranged in the circumferential direction of the tube 2.

[0005]

However, the above-mentioned technique has the following problems. This type of coating apparatus generally coats a tubular material having a tube length of about 5 to 12 m. As shown in FIG. 5, the above-mentioned coating apparatus requires that the digging means 10 and the ultraviolet irradiation means 11 be provided between the conveying means 1a and the conveying means 1b. In this case, in particular, the ultraviolet irradiation means 11 requires a certain distance in the tube longitudinal direction.

Therefore, the transport means 1a and the transport means 1b
Since the distance between the two becomes long, it is difficult to run a tubular material having a short tube length, and painting cannot be performed. Further, even in the case of a tubular material having a long pipe length, in the case of a curved pipe, it is difficult to run and paint.

The present invention is intended to solve the above-mentioned problems, and prevents the paint from dripping by applying the tubular material with a coating machine regardless of the length of the tubular material normally used for painting. However, it is an object of the present invention to provide a squeeze apparatus capable of making the film thickness uniform and thin.

[0008]

SUMMARY OF THE INVENTION The present invention is a squeeze device having a squeeze plate provided between the exit side of the pipe coating machine and the ultraviolet irradiating means, the conveying means being between the exit side of the pipe coating machine and the ultraviolet irradiating means. And one or more claw plates having an opening with a hole diameter smaller than the outer diameter of the pipe in front of the conveying means, and one claw plate having an opening with a hole diameter substantially the same as the outer diameter of the pipe after the conveying means. It is a pipe coating squeezing device characterized by having three or more.

[0009]

According to the present invention, the conveying means is provided between the exit side of the tube coating machine and the ultraviolet irradiating means, so that the pipe is connected to the conveying means on the entrance side and the exit side of the squeegee device for pipe coating until it exits the ultraviolet irradiating means from the tube coating machine. Is transported by the transport means.

As the squeegee plate provided in front of the conveying means, one or more squeegee plates having an opening having a hole diameter smaller than the outer diameter of the pipe are provided. Since this plate has a hole diameter smaller than the outer diameter of the pipe, the coating film on the outer peripheral surface of the pipe that has passed through is uniform, and after that, it descends to the pipe of the transport means provided between the exit side of the pipe coating machine and the ultraviolet irradiation means. Occasionally the coating film has a small crack. Further, as a squeegee plate provided after the conveying means, one or more squeegee plates having an opening portion having a hole diameter substantially the same as the pipe outer diameter are provided. Thereby, the coating film is thinned uniformly.

In the present invention, the pipe is conveyed in the coating apparatus by the above-mentioned conveying means, and the combination of the above-mentioned ironing plates squeezes the paint applied to the outer peripheral surface of the pipe to form a uniform thin coating film. Then, a cured coating tube by ultraviolet irradiation is obtained.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention. In FIG. 1, reference numeral 21 is a conveying means provided between the exit side of the tube coating machine 3 and the ultraviolet irradiation means 11. Here, the pipe 2 passes through the coating device from the pipe coating machine 3 to the ultraviolet irradiation means 11 by the transporting means 1a, the transporting means 21, and the transporting means 1b.

Therefore, a tubular material having a pipe length of about 5 to 12 m, which is generally used for coating, can be coated by being passed through a coating device regardless of the length of the pipe. Further, even a curved pipe having a long pipe length can be similarly run and painted.

Reference numeral 22 is a squeegee plate provided in front of the conveying means 21 and having an opening having a hole diameter smaller than the outer diameter of the pipe. Here, one claw plate 22 is installed between the pipe coating machine 3 and the conveying means 21. The claw plate 22 is not limited to this, and a plurality of claw plates 22 can be provided as necessary. Usually, up to a few are provided. After the paint is applied by the head 4 of the coating liquid supply means in the coating machine 3, the squeeze board 22
Since the distance to is short, less paint drips between them.
Further, the iron plate 22 can be provided inside the pipe coating machine 3. When the rear end of the tube 2 passes through the squeegee plate 22, the UV curable coating liquid on the squeegee plate 22 is scattered,
Since it is inside the tube coating machine 3, it is easy to collect.

Reference numeral 23 is a squeegee plate provided after the conveying means 21 and having an opening having a hole diameter substantially the same as the outer diameter of the pipe. Here, the claw plate 23 is attached to the conveying means 21 and the ultraviolet irradiation means 11.
One is installed between. The claw plate 23 is not limited to this, and a plurality of claw plates 23 can be provided as needed. Usually, up to a few are provided.

In the present invention, the above-mentioned squeeze plate 22 and the above squeeze plate 23 are provided in combination before and after the conveying means 21 to form a uniform thin coating film and obtain a cured coating tube by ultraviolet irradiation.

FIGS. 2 (a) and 2 (b) are views showing the ironing state of the iron plate provided in front of the conveying means between the exit side of the pipe coating machine and the ultraviolet irradiating means, and FIG. 2 (a) shows the present invention. The figure when the hole diameter of the opening part of the iron plate is made smaller than the pipe outer diameter, and (b) is a diagram when the hole diameter of the opening part of the iron plate is made substantially the same as the pipe outer diameter in the comparative example.

In FIG. 2A, the coating film 24 on the tube surface of the paint adhering tube 2b is rubbed with the squeegee plate 22. Here, since the hole diameter of the opening 22a of the iron plate 22 is made small, it bends around the hole diameter and completely eliminates the sagging of the coating film 24 on the surface of the pipe that has passed, thereby forming a uniform film thickness. Even if the conveying means 21 by a pinch roll is brought into contact with the surface of the coating film in a descending manner, the occurrence of jump is small.

On the other hand, in FIG. 2B, the paint adhering pipe 2
The coating film 24 on the tube surface of b is squeezed by the claw plate 22. However, since the hole diameter of the opening 22b of the iron plate 22 is made substantially the same, there is not much bending around the hole diameter, and the pipe axis of the paint adhering pipe 2b is from the center line (indicated by a chain line) of the coating line. When they are deviated, it is easy to form a non-uniform film thickness. Therefore, when the conveying means 22 by a pinch roll is brought into contact with the surface of the coating film in a descending manner, the occurrence of jumps is often large due to the nonuniform film thickness.

FIGS. 3 (a), (b), (c) and (d) are views showing the ironing state of the iron plate provided after the conveying means between the exit side of the tube coating machine and the ultraviolet irradiation means. (A) is a figure when the hole diameter of the opening part of the iron plate of the present invention is made substantially the same as the pipe outer diameter, (b) is a figure which shows the state when the iron plate of (a) is used, (c) FIG. 8A is a diagram showing a comparative example in which the hole diameter of the opening of the iron plate is smaller than the outer diameter of the pipe, and FIG. 8D is a diagram showing the state when the iron plate of FIG.

In FIGS. 3 (a) to 3 (d), the claw plate 2 is used.
3 is for determining the film thickness of the paint adhering tube 2b, and here the hole diameter of the opening 23a is made substantially the same.

By making the hole diameter of the iron plate 23 substantially the same as the outer diameter of the pipe, the coating film 24 on the pipe surface of the paint adhering pipe 2b can be thinned by squeezing. For that purpose, it is necessary that the coating film 24 on the tube surface before squeezing is uniform.

In the present invention, the coating film 24 is formed by the sand plate 22.
Therefore, it is possible to obtain the paint adhering tube 2b on which a uniform and thin coating film is formed for the first time due to the synergistic effect of the claw plate 22 and the claw plate 23. After that, the coating film attaching tube 2b is subjected to ultraviolet curing of the coating film by the ultraviolet irradiation means 11 to obtain a uniform cured coating tube. On the other hand, in the comparative example, since the hole diameter of the opening 23b of the iron plate 23 is smaller than the outer diameter of the pipe, the coating film 24 on the pipe surface becomes thick. for that reason,
It is not easy to UV cure the coating to obtain a uniform cured coated tube.

FIG. 4 is a diagram showing the relationship between the film thickness according to the present invention and the ratio of hole diameters of the plate after the conveying means. Here, the rubber plate of EPDM quality (rubber thickness 8.0
mm), and two cases of rubber hardness Hs 80 ° (plotted with a circle) and Hs 65 ° (plotted with a triangle) were examined. As is clear from FIG. 4, the film thickness can be reduced as the ratio of the hole diameters of the claw plate is increased (close to 1).

[0026]

As described above, according to the shigoki device of the present invention, the pipe can be smoothly passed through the coating device,
In addition, since it is possible to prevent the coating material from dripping after being applied by a coating machine and to make the film thickness uniform and thin, it is possible to obtain a uniform ultraviolet curing coating tube.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a diagram showing a squeezing state of a claw plate provided in front of a conveying unit according to the apparatus of the present invention.

FIG. 3 is a diagram showing a squeezing state of a squeegee plate provided after the conveying means according to the apparatus of the present invention.

FIG. 4 is a diagram showing a relationship between a film thickness according to the present invention and a ratio of hole diameters of the plate after the conveying means.

FIG. 5 is a diagram showing an example of a conventional coating apparatus.

[Explanation of symbols]

 1a, 1b Conveying means 2 Pipes 3 Ultraviolet curing coating liquid supplying means (coating machine) 4 Head 5 Pan 6 Paint tank 7 Filter 8 Pump 9 Line 10 Shigoki means 11 Ultraviolet irradiating means 12 Irradiation source 21 Conveying device 22 In front of the conveying device Lag board 22a, 22b Lag board opening 23 23 Lag board 23a, 22b Lag board opening after transport 24 Coating film

Claims (1)

[Claims] 1. A squeeze device in which a squeegee plate is provided between the exit side of the tube coating machine and the ultraviolet irradiating means, wherein a conveying means is provided between the exit side of the tube coating machine and the ultraviolet irradiating means. One or more squeegee plates having an opening having a hole diameter smaller than the outer diameter of the pipe are provided in front, and one or more squeegee plates having openings having a hole diameter substantially the same as the outer diameter of the pipe are provided after the conveying means. Shigoki device for pipe coating.