JP2001198502A - Coating device and coating method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating device capable of conducting coating with uniform thickness even on a material to be coated, which has a cubic shape, and coating method using the coating device. SOLUTION: In this coating device, plural coating guns for spraying a coating material on the material to be coated are provided and each coating gun is structured to overlap the end part of the coating locus and the end part of the coating locus of the adjacent coating gun each other, to be supported at a place where the sprayed coating material is not in collision with the coating material sprayed from the adjacent coating gun and to reciprocate in the direction crossing the transporting direction of the material to be coated. Further, the device is provided with a gun spray angle adjusting actuator capable of changing the spray angle in the forth movement and that in the back movement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus and a coating method using the coating apparatus.

[0002]

2. Description of the Related Art Building materials, such as cement roof tiles, in which a base material is formed of cement, are coated on the surface of the base material in order to impart functions such as waterproofness, cosmetic properties, and weather resistance. As the coating method, the base material as the object to be coated is transferred in one direction by a transfer means such as a conveyor, and the coating gun of a coating apparatus provided in the middle of the transfer is reciprocated so as to be orthogonal to the transfer direction. In general, a method of spraying a coating material onto a base material surface from a spray port (nozzle) of a coating gun is used.

By increasing the conveying speed (line speed) of the object to be coated (in general, the upper limit is 60 m / min),
If the reciprocating speed of the coating gun is not reduced, the spray pattern is disturbed and uniform coating cannot be performed. Therefore, instead of slowing down the reciprocating movement, it is necessary to expand the spray pattern (nozzle pattern) so that a large area can be painted in one forward movement and one backward movement.
Due to the lack of stability of the sprayed paint, it is not possible to achieve a very wide spray pattern.

Therefore, in the conventional coating apparatus, the reciprocating speed is reduced, and the width of the spray pattern for spraying the paint is small (about 100 to 500 mm). The paint trajectory of the paint gun overlaps the end of the paint trajectory of the adjacent paint gun at its end, and the adjacent paint gun is staggered so that the sprayed paint does not collide with the paint sprayed from the adjacent paint gun. In this state, the coating is performed while reciprocating in a direction intersecting the transport direction of the object to be coated in a state of being arranged in the transport direction.

[0005] That is, by disposing a spray gun having a small spray pattern width so that the spray pattern overlaps at an end portion, a large area can be coated in one forward movement and one backward movement, and an adjacent paint can be applied. By arranging the guns in a staggered state, it is possible to prevent the paint sprayed from the adjacent paint guns from colliding with each other and thereby disturb the spray pattern, so that the paint can be uniformly applied.

With the structure of the conventional coating apparatus, it is possible to uniformly apply a flat object to be coated. However, as shown in FIG. In the case of the object 100 to be coated, the projection area (spray area) differs depending on the part to be applied (the X part and the Y part in FIG. 6), so that it is impossible to apply a uniform thickness.

[0007]

SUMMARY OF THE INVENTION In view of such circumstances, an object of the present invention is to provide a coating apparatus and a coating apparatus capable of applying a uniform thickness to an object having a three-dimensional shape. The purpose is to provide the coating method used.

[0008]

In order to achieve such an object, a coating apparatus according to the first aspect of the present invention (hereinafter referred to as "the coating apparatus of the first aspect") is provided with a coating apparatus. It has a plurality of paint guns for spraying paint on the paint, and each paint gun has its paint trajectory overlapping at its end the end of the paint trajectory of the adjacent paint gun, and the sprayed paint is adjacent to the adjacent paint gun. In a coating apparatus that is reciprocated in a direction intersecting the conveying direction of the object to be coated while being supported at a position where it does not collide with the paint sprayed from the gun, at least spraying of each coating gun at the time of forward movement The configuration is provided with a gun spray angle adjusting actuator capable of changing the angle and the spray angle at the time of reversing.

According to a second aspect of the present invention, there is provided a coating apparatus (hereinafter referred to as a "second coating apparatus"), wherein each of the coating guns is arranged horizontally in the transport direction. Is supported to be in a staggered position with the coating gun adjacent to the support member extending in the direction, and a gun spray angle adjustment actuator rotates the support member around its axis to collectively adjust the spray angle of all the coating guns. In addition to being adjustable, each coating gun is provided with a coating gun spray position adjusting actuator capable of individually changing the distance between the spray port and the object to be coated.

According to a third aspect of the present invention, there is provided a coating apparatus (hereinafter referred to as a "third coating apparatus") according to the first aspect of the present invention, wherein the spraying is performed when the coating gun is moved forward. A means for changing the angle and the spray angle at the time of reversing is provided on a link rod provided in a direction intersecting the conveying direction of the object to be coated,
When a plurality of coating guns are mounted via mounting arms and the spray angle of the coating gun mounted on one mounting arm is changed, the spray angle of the coating gun mounted on all other mounting arms is changed. And a link mechanism for simultaneously linking and changing the same in the same direction, and a spray gun spray angle adjusting actuator for changing the spray angle of the spray gun attached to the one mounting arm.

In the coating apparatus according to any one of the first to third aspects, it is preferable that the change range of the spray angle by the gun spray angle adjusting actuator can be freely changed within a range of 0 ° to 90 °.

The coating method according to the present invention is characterized in that
Using the coating apparatus according to any of the above, all the coating guns, so that the coating amount of each part of the object to be coated is uniform, in a state where the distance between the spray port and the object to be coated, The spraying was performed while changing the spray angle at the time of forward movement and the spray angle at the time of backward movement.

In the present invention, the spray angles at the time of forward movement and at the time of backward movement are empirically determined by the shape of the object to be coated.
For example, when the three-dimensional shape is an object to be coated having a symmetric shape with respect to the vertical surface, the object is symmetrical with respect to the vertical surface between the forward movement and the backward movement, but if the three-dimensional shape is asymmetric with respect to the vertical surface. The spray angle at the time of forward movement and the spray angle at the time of backward movement are asymmetric.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described in detail with reference to the drawings. 1 to 4 show one embodiment of a coating apparatus according to the present invention.

As shown in FIG. 1 to FIG.
Includes a stay (beam) 2 as a support member, a stay support member 3, four coating guns 4, and an air cylinder 5 as a gun spray angle adjustment actuator. The stay support member 3 is slidably supported by a rail (not shown) provided on the ceiling side of a coating booth (not shown) and provided horizontally in a direction perpendicular to the direction of transport of the workpiece 6. At the same time, the object 6 is reciprocated in a direction perpendicular to the conveying direction of the object 6 by a driving means (not shown).

The stay 2 has a rod shape with a circular cross section.
The shaft is supported by the lower end of the stay support member 3 so as to be parallel to the transport direction of the workpiece 6 and to be rotatable around the axis. Each coating gun 4 is shown in FIGS.
As shown in FIG. 3, the nozzle unit 4 includes an air cylinder unit 41 as a gun spray position adjustment actuator and a nozzle unit 42 having a spray port 42a, and the cylinder rod 41a of the air cylinder unit 41 expands and contracts.
2 is arranged so as to be in contact with the workpiece 6.

As shown in FIG. 4, each coating gun 4 has a trajectory T of the spray pattern P overlapping with a trajectory T of the spray pattern P of the adjacent coating gun 4 at an end portion.
The sprayed paint 8 and the paint 8 sprayed from the adjacent coating gun collide with each other and are supported in a staggered manner on the stay 2 at such a pitch that they do not interfere with each other's spray pattern P.

As shown in FIGS. 2 to 4, the air cylinder 5 has a cylinder rod 52 having one end of a main body 51 pivotally supported by a pivot portion 31 of the stay support member 3, and being provided on the main body 51 so as to be extendable and contractible. Of the pivot 2 provided on the stay 2
One is pivoted. That is, the air cylinder 5 can be changed to the spray angle of each coating gun 4 by rotating the stay 2 in the expansion and contraction direction about the axis thereof by the expansion and contraction of the cylinder rod 52 of the air cylinder 5. ing.

The coating apparatus 1 is configured as described above. As shown in FIG. 1, when a coating is applied to the surface of the workpiece 6 having a cross-sectional waveform or the like, the coating is applied to the workpiece 6 as follows. Can be applied. That is, first, the workpiece 6 is transported by the transport means, and the stay supporting member 3
Is reciprocated so as to be orthogonal to the transport direction of the substrate.

At the time of forward movement, as shown in FIG. 1A, the cylinder rod 52 of the air cylinder 5 is tilted so that the nozzle portion 42 is tilted in the forward movement direction so as to have a spray angle previously determined empirically. Is extended so that the stay 2 is rotated, and the rotation of the stay 2 causes the position of the gun body 41 to be higher than the adjacent gun body 41 of the adjacent coating gun 4 (the left side in FIG. 1A). 4 is extended, and the adjacent coating gun 4 (FIG.
The cylinder rod 42a (on the right side in (a)) is retracted, and the distance α between the spray port 41a and the workpiece 6 and the spray port 4
The paint is applied in such a manner that the distance 1 'between the substrate 1a and the workpiece 6 is matched.

At the time of the backward movement, as shown in FIG. 1B, the cylinder of the air cylinder 5 is tilted in the backward movement direction so that the spray angle is similarly obtained empirically. The stay 52 is inverted by retracting the rod 52, and the position of the gun body 41 is higher than the adjacent gun body 41 of the adjacent coating gun 4 by the inversion of the stay 2 (right side in FIG. 1B). The cylinder rod 42a of the coating gun 4 is extended, the cylinder rod 42a of the adjacent coating gun 4 (the left side in FIG. 1B) is retracted, and the distance β between the spray port 41a and the workpiece 6 is determined. Spray port 4
The paint is applied with the distance β ′ between 1a and the work 6 to be matched.

As described above, the coating apparatus 1 can freely change the spray angle between the forward movement and the backward movement, so that the spray angle can be changed between the forward movement and the backward movement as in the above-described coating method of the present invention. By changing the spray angle, it is possible to apply a uniform coating even on an object having a three-dimensional shape such as the object 6 to be coated. Of course, since the adjacent coating guns 4 are arranged in a staggered position and the paint sprayed from each coating gun 4 does not collide with the paint sprayed from the adjacent coating gun 4, the spray pattern P is disturbed. Absent. Also, the painting pattern P
Are overlapped at the end, so that the paint can be applied more uniformly.

FIG. 5 shows another embodiment of the coating apparatus according to the present invention. In the coating apparatus shown in FIG. 5, the means for changing the spray angle at the time of forward movement and the spray angle at the time of backward movement of the coating gun does not change the height of the coating gun from the object to be coated. Is going to change.

When the spray angle of the coating gun mounted on one mounting arm is changed, the spray mechanism of the coating gun mounted on all other mounting arms is simultaneously linked in the same direction to change the spray angle. The operation of the actuator for adjusting the spray direction of the coating gun will be described with reference to FIG.

As shown in FIG. 5A, a plurality of pairs of mounting arms 30 are rotatably connected to the link rod 20 at one end 301, and to the other end 302, respectively. A painting gun 40 is attached. In this manner, the group of the mounting arms 30 connected to the link rod 20 is rotatably fixed to a mounting frame (not shown) of the coating apparatus near the other end 302 so as to be mounted.

The mounting arm 30 mounted as described above
One end of an arm 51 orthogonal to the axis of the mounting arm 30 is fixed to the mounting arm 30, and the other end of the arm 51 is moved up and down by an air cylinder used as a spray direction adjusting actuator. A coating gun spray angle adjusting mechanism is rotatably connected to the end 52.

When the working end 52 of the air cylinder 50 shown in FIG. 5A is pressed downward as shown by the arrow, the arm 51 rotates clockwise as shown by the arrow in the drawing.
At the same time, the mounting arm 30 is rotated in the same direction to
In the direction indicated by the arrow. By the movement of the link rod 20 in the direction indicated by the arrow, all the mounting arms 30 connected to the link rod 20 become
Rotated in the same direction as 0, the spray direction of all paint guns
For example, the position can be changed to the position shown in FIG. When the operating end 52 of the air cylinder 50 operates in the direction opposite to the arrow, all the arrows in FIG. 5A face in the opposite direction, and are symmetrical to the position shown in FIG. The spray angle of the paint gun is changed downward.

The apparatus for changing the spray angle at the time of forward movement and the spray angle at the time of backward movement of the coating gun by the link mechanism is not limited to the apparatus shown in FIG. Instead of a device that guides the link rod 20 by moving the link rod 20, a device that slides the link rod 20 by the actuator for adjusting the spray direction and rotates the mounting arm 30 by the movement of the link rod 20 may be used.

As described above, since the direction of displacement of the coating gun 40 is only one, the spray angle of the coating gun can be adjusted in the same direction by a single actuator by incorporating a link mechanism. Make it possible. For simplicity of description, the number of bases of the coating gun 40 attached to the beam 20 via the attachment arm 30 is two, but is not limited to this, and the number of the coating guns 40 is not limited to this, and the number of the coating guns 40 depends on the shape of the workpiece Needless to say, the required radix is attached in the width direction.

The same beam 20 is provided in a plurality of stages in parallel in the transport direction of the object to be coated, that is, in the vertical direction in the drawing, as in the above-described embodiment.
Further, the coating guns attached to the beams 20 provided in a plurality of stages in parallel via the attachment arm 30 are arranged in a staggered manner so that the trajectories T of the adjacent spray patterns P overlap at the end portions. Also, the pitch is set so as not to obstruct the spray pattern P from each other as in the above-described embodiment.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the spray angles of all the coating guns are changed by rotating the stay, but the coating guns are individually supported so that the spray angle can be changed as in the above embodiment. The member may be supported. In this case, each coating gun may be connected by a link rod or the like, and the driving means may be connected to the link so that all the coating guns can be changed in conjunction with one driving means so that the spray angle can be changed. The spray angle may be changed.

[0032]

Since the coating apparatus and the coating method according to the present invention are configured as described above, the object to be coated having a three-dimensional shape can be obtained by appropriately changing the spray angle between the forward movement and the backward movement. Even with this, the coating can be applied to a uniform thickness.

[Brief description of the drawings]

FIG. 1 shows a coating method 1 using a coating apparatus according to the present invention.
It is explanatory drawing explaining one Embodiment.

FIG. 2 is a side view of a main part of the coating apparatus of FIG. 1;

FIG. 3 is a front view of a main part of the coating apparatus of FIG. 1;

FIG. 4 is a plan view of a main part of the coating apparatus of FIG. 1;

FIG. 5 is an explanatory view illustrating another embodiment of a coating method using the coating apparatus according to the present invention.

FIG. 6 is an explanatory view illustrating a coating method of a conventional coating apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Coating apparatus 2 Stay (support means) 4 Painting gun 41 Air cylinder part (Coating gun spray position adjustment actuator) 42 Nozzle part 42a Spray port 5, 50 Air cylinder (Gun spray angle adjustment actuator) 20 Link rod 30 Mounting arm 301 Link rod side connection end 302 Painting gun side connection end 40 Painting gun 51 Arm 52 Vertical moving end

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Claims (4)

[Claims] A coating gun for spraying a paint on an object to be coated has a plurality of coating guns. Each of the coating guns is sprayed while its coating trajectory overlaps the end of the coating trajectory of an adjacent coating gun at its end. In a coating apparatus which is configured to reciprocate in a direction intersecting the conveying direction of the object to be coated while being supported at a position where the applied paint does not collide with the paint sprayed from the adjacent coating gun, A coating apparatus comprising a gun spray angle adjusting actuator capable of changing at least a spray angle at a forward movement and a spray angle at a backward movement. 2. Each of the coating guns is supported so as to be in a staggered position with a coating gun adjacent to a support member extending horizontally in the transport direction.
By rotating this support member around its axis, the spray angle of all coating guns can be adjusted collectively, and each coating gun can individually change the distance between its spray port and the object to be coated. The coating apparatus according to claim 1, further comprising an actuator for adjusting a spray position of the spray gun. 3. A means for changing the spray angle at the time of forward movement and the spray angle at the time of backward movement of the coating gun includes a plurality of link rods provided in a direction intersecting the conveying direction of the object to be coated. When the spray gun is mounted via the mounting arm and the spray angle of the spray gun mounted on one mounting arm is changed, the spray angles of the spray guns mounted on all other mounting arms are simultaneously adjusted. 2. The coating apparatus according to claim 1, further comprising a link mechanism for linking and changing the direction of the coating gun, and a coating gun spray angle adjusting actuator for changing a spray angle of the coating gun attached to the one mounting arm. . 4. The spray angle and the spray angle at the time of forward movement are adjusted so that the distance between the spray port and the object to be coated is equal so that the coating amount of each part of the object is uniform. A coating method using the coating apparatus according to any one of claims 1 to 3, wherein the coating is performed while changing the spray angle at the time of the backward movement.