JPH08117677A - Spray coating method - Google Patents

Abstract

PURPOSE: To improve coating efficiency in a equipment by which a horizontally long material to be coated is hung from a conveyor through a hanger, the material is turned to a specified angle, and the three faces of the material are spray-coated with one spray gun by shifting the axis of rotation of the hanger from the center of the material in its longitudinal direction. CONSTITUTION: A material 1 is hung from a conveyor 3 through a hanger 5 and transported to the left. When the material proceeds in front of a spray gun 9, the material 1 is projected forward from a rotor 4 as the axis of rotation of the hanger 5 in the traveling direction, the material 1 enters the paint spray width of the gun 9 earlier than the hanger 5, and the face (a) is coated. A cross plate 6 attached to the hanger 5 is then engaged with a first cylinder 7 and turned clockwise by an angle of 90 deg., and the face (b) is coated. When the material 1 is conveyed further to the left, the cross plate 6 is abutted on a second cylinder 8 and turned clockwise to an angle of 90 deg., and the face (c) of the material 1 is coated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray coating method in which an object to be coated hung on a conveyor is rotated during transport to coat different surfaces.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 3 and 4, when spraying three surfaces a, b and c of an object 1 which is long in the lateral direction, the object 1 travels along a guide rail 2. A hanger 5 is rotatably connected to the conveyor 3 via a rotor 4, and the article 1 is hung and hung on the hanger 5 at the center in the longitudinal direction, and a cross plate 6 is fixed in the middle of the hanger 5. The surface a is directed to the spray gun 9 at the right side position shown by the solid line in the figure, and the cross plate 6 hits the first cylinder 7 while being conveyed to the left. After rotating 90 ° in the direction and directing the surface b toward the spray gun 9 at the center position shown by the one-dot chain line in the figure, the cross plate 6 hits the second cylinder 8 while being conveyed further to the left. Rotate 90 ° clockwise and use the two-dot chain line At the position on the left side shown in the drawing, the surface c is directed toward the spray gun 9 so that the three surfaces a, b and c are painted.

However, in such a method, as shown in FIG. 4, the spray width of the paint sprayed from the spray gun 9 is insufficient and uneven coating occurs on the surfaces a and c. It was necessary to line up the individual pieces, and the distance between the surface b and the spray gun 9 was greatly changed from the distance between the surfaces a and c and the spray gun 9, so that uniform coating could not be performed.

[0004]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is that the spray width of the paint is insufficient in the conventional method and uneven coating occurs. Therefore, it is necessary to arrange two or more spray guns. The cost is high, the installation space is large, and the three surfaces cannot be coated uniformly.

[0005]

As a means for solving such a problem, the present invention has a structure in which the rotation center of the hanger is deviated from the center of the object to be coated in the longitudinal direction.

[0006]

The function and effect of the present invention are as follows.
If the center of rotation of the hanger is shifted to the rear side in the conveying direction of the object to be coated, the object to be coated will enter the spray width of the paint before the center of rotation of the hanger enters the spray width of the paint, and the hanger will rotate by 90 °
When the back side turns to the spray gun after rotating once, the object to be coated is behind the rotation center of the hanger in the transport direction, and the object rotates within a range narrower than the moving distance of the rotation center of the hanger. It is possible to coat three surfaces uniformly within the spray width of a small number of spray guns.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

In the figure, 1 is an article to be coated, 2 is a guide rail, 3 is a conveyor, 4 is a rotor, 5 is a hanger, 6 is a cross plate, 7 is a first cylinder, 8 is a second cylinder, and 9 Is a spray gun, which is the same as the conventional example shown in FIGS. 3 and 4, but in the present embodiment, the hanger 5 is bent twice at a right angle and the rotor 4 serving as the center of rotation thereof.
Is largely deviated to the outside in the length direction of the article to be coated 1.

When the article to be coated 1 is conveyed from the right side to the left side in the drawing by the conveyor 3 and approaches the front of the spray gun 9, the article to be coated 1 is transferred to the hanger 5 as shown by the solid line in the figure. When the rotor 4 as the center of rotation is projected forward in the transport direction, the article to be coated 1 enters the spray width of the paint of the spray gun 9 before the hanger 5, and after the surface a is coated, the cross The plate 6 engages with the first cylinder 7 and rotates 90 ° clockwise in FIG. 2, and the surface b is painted toward the spray gun 9 as shown by the alternate long and short dash line in FIG.

Thereafter, when the article 1 to be coated is further conveyed to the left, the cross plate 6 hits the second cylinder 8 and rotates 90 ° clockwise in FIG. 2, and as shown by the two-dot chain line in FIG. The surface c of the article to be coated 1 is applied to the spray gun 9, and at this time, the article 1 is on the rear side in the transport direction with respect to the rotor 4 which is the rotation center of the hanger 5.

Therefore, the article to be coated 1 is rotated by 180 ° in a narrow range as compared with the conventional example shown in FIGS. 3 and 4, and the three surfaces a, within the spray width of the paint of the spray gun 9.
Since b and c can be painted, it can be painted evenly.

[Brief description of drawings]

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

FIG. 2 is a plan view of one embodiment of the present invention.

FIG. 3 is a front view of a conventional example.

FIG. 4 is a plan view of a conventional example.

[Explanation of symbols]

 1: coated object 3: conveyor 4: rotor (center of rotation of hanger) 5: hanger a, b, c: painted surface

Claims (1)

[Claims] 1. A coating method in which a laterally long object to be coated is hung on a conveyor by a hanger and conveyed while being rotated by 90 ° twice and spraying three surfaces sequentially with one spray gun. A spray coating method characterized in that the center of rotation of the hanger is displaced from the center of the object to be coated in the longitudinal direction.