JP2778021B2 - Color change cleaning method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color changing cleaning method for efficiently changing the color of a coating gun when changing a coating color in a top coating process.

[0002]

2. Description of the Related Art Conventionally, for example, in a top coating process of an automobile, a car body conveyed at a constant interval is sequentially loaded into a booth and is automatically coated using a coating gun, but the same coating in the same booth is performed. Sometimes different colors are painted using a robot. And when this paint color is, for example, the front color is black and the next is to paint white, it is not preferable to carry in the next work while the mist of the black paint of the previous color is floating in the booth, If the same paint gun is painted as it is, there is a problem such as a change in the paint color due to color mixing, so at the time of color change, one trolley is created between the works and the floating mist is settled during this time. Such a method is adopted that the coating line leading to the coating gun is cleaned with a thinner or the like. For this reason, when changing colors, a color change instruction plate is attached to a carriage on which a work whose paint color is to be changed is mounted, and this is detected by a photoelectric tube, and the carriage 1 is detected.
A space for the car was made, and the color change procedure was performed.

[0003]

However, in the prior art, since a space for one truck is provided for each color change, the loss time is large, and a fixed amount of thinner or the like is used for each color change for cleaning. Therefore, there was a problem that the cost was high.

[0004]

In order to solve this problem, the present invention divides the color change mode into the same color, the non-avoidance color, and the avoidance color with respect to the preceding work, which can be identified by the paint color indicating plate. In addition to this, the procedure is changed according to the mode of the color change. In other words, in the case of the same color, the painting gun is not washed.In the case of the non-evading color, the painting gun is washed with the robot returning to the original position after the work being painted is completed. An empty space for one carrier was created between the work being painted and the work at the entrance of the booth, and when the robot returned to its original position, the empty space for this one unit was used to wash the paint gun. .

[0005]

[Function] When changing colors, those having a large influence of the floating mist of the original paint color and those having a large degree of influence of the mixed color are set as avoiding colors, and those having little influence of the floating mist and the mixed color are set as non-avoidable colors. In the case of the avoidance color, the washing is performed in the same procedure as in the related art, and in the case of the non-avoidance color, no empty space is provided in the truck, and the amount of thinner used is also reduced to about 2/3 of the conventional amount. Continue painting without washing the same color. By separating the color change modes in this manner, the space in the truck is reduced, and the use efficiency of the thinner is increased.

[0006]

An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a control circuit diagram for controlling the cleaning method of the present invention, FIG. 2 is an explanatory view showing a paint color indicating plate mounted on a dolly, FIG. 3 is a flowchart of determination after detection of a photoelectric tube, and FIG. It is a flowchart.

As shown in FIG. 1, for example, in an automobile topcoating process, a topcoating booth 1 and a transfer line 2 for transferring a work W are provided.
A plurality of coating robots 3,... Are provided, and a robot control panel 4 for controlling the coating robots 3,.

A paint supply pipe 5 is connected to each of the painting robots 3... The paint supply pipe 5 is provided with a valve for selectively supplying the paint in the paint tank 7 and the cleaning liquid in the thinner tank 8 via a manifold 6. 9 is switchable. And
A constant-pressure pump 1 for supplying these paints and cleaning liquids
0, and a color change control panel 11 for switching control of the valve 9
Are provided, and the color change control panel 11 is connected to the robot control panel 4.

On the other hand, a work W mounted on a dolly cart 12 as shown in FIG. 2 is conveyed to the conveyance line 2 at predetermined intervals, and these dolly carts 12 are conveyed by a conveyor control panel 13. Driven by the drive source 14. The conveyor control panel 13 and the robot control panel 4 are connected to each other to exchange input / output signals.

A photoelectric tube 15 is provided on the side of the transport line 2 at the entrance of the overcoat booth 1. This photoelectric tube 1
Numeral 5 is for detecting the paint color indicating plate 16 of the dolly 12 described below, and sends a detection signal to the robot control panel 4.

As shown in FIG. 2, the paint color indicating plate 16 can be attached to the front of the dolly 12 so that the work to be conveyed in front and the necessity of changing the color of the paint of the work and the cleaning of the paint gun are required. This indicates the necessity, and is provided with an identification hole 17 for classifying washing and the like into three modes.

That is, for example, the identification hole 17 has no perforation, one perforation, and two perforations.
If there is no perforation, it indicates that the color of the work W is the same for the front work W. One perforation indicates the non-avoidance color, and two perforations indicate the avoidance color.

At this time, for example, when the original paint color is red, black, blue, dark blue, and the like are non-avoidance colors, and white, yellow, gray, and the like are avoidance colors. When the original paint color is white, all the next colors are avoidance colors, and when the original paint color is black, the dark blue color is a non-avoidance color and the others are avoidance colors.

In other words, when the color is changed, those having a large influence of the floating mist of the original paint color in the booth 1 and those having a large influence on the painted surface due to the mixed color are determined as avoidable colors, and the influence of the floating mist and the mixed color is determined. Colors that are not so large are considered non-evasive colors.

The coating data for one day is stored in the color change control panel 1 in advance.
1, the coating in the overcoating booth 1 is performed while sequentially changing the coating color based on the input data. However, only when the input data and the data from the photoelectric tube 15 match, as shown in FIG. In this way, the painting operation is continued or the washing is performed, and when they do not match, an alarm is issued and the line is stopped.

Next, the flow of the painting operation in each mode will be described.

First, when the same color is detected by the photoelectric tube 15, the painting operation is performed in a normal cycle as shown in FIG. In other words, robot 3 after painting
Returns to its original position and waits. During this time, the painted work is carried out, the next work is carried in, and the painting work is repeated.

Next, when an avoidance color is detected, a signal is sent to the conveyor control panel 13 to create a space for one truck by a stopper (not shown) provided at the entrance of the overcoating booth 1, and the coating robot in the booth 1 Among the three,..., The robot 3 in which the empty trolley comes to the front performs cleaning of the coating gun as shown in FIG.

That is, the coating robot 3 returns to the original position and stands by, all the supply paths from the paint tank 7 to the manifold 6 in FIG. 1 are closed, and the supply path from the thinner tank 8 to the manifold 6 is opened. . Then, by operating the constant-pressure pump 10, the thinner flows through the manifold 6, and the supply path such as the paint supply pipe 5 between the manifold 6 and the coating gun is washed.

When the cleaning is completed, the conveyor is operated by the conveyor control panel 13, the next work is carried in, and a new coating color is applied. In addition, the cleaning method as described above is
This is almost the same as the conventional cleaning method, and the amount of thinner used is almost the same.

When the photoelectric tube 15 detects a non-avoidable color, no empty space is provided for the truck. That is, as shown in FIG. 4 (C), the painting robot 3 returns to the original position and starts washing, while the painted work is carried out and a new work is carried in. The thinner discharge amount at the time of cleaning is, for example, 2/3 of the amount of the avoidance color.

When the washing is completed, the painting robot 3 enters a standby state at the original position, and paints the carried-in work with a new painting color. By controlling in the manner described above, not only can the number of empty trolleys be reduced to increase work efficiency, but also the amount of thinner used can be reduced.

[0023]

As described above, according to the present invention, in the color change cleaning of the coating robot, the cleaning mode which has conventionally been always performed under the same conditions has been divided into three sections, and an empty trolley is provided only when necessary. , And because it was made to wash with the minimum necessary washing solution,
Work efficiency and cleaning efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a control circuit diagram for controlling a cleaning method.

FIG. 2 is an explanatory view showing a paint color indicating plate attached to a dolly cart.

FIG. 3 is a flowchart of determination after detection of a phototube;

FIG. 4 is a flow chart of a cleaning work cycle, wherein (A) is the same color, (B) is the avoidance color, and (C) is the non-avoidance color

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Top coating booth 3 Painting robot 15 Photoelectric tube 16 Painting color indicator board 17 Identification hole W Work

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B05D 1/02-1/14 B05B 12 / 08,12 / 14 B05C 11/00 B05C 13/00 B05D 3/00 B05D 7 / 14 B05C 9/08-9/14

Claims (1)

(57) [Claims] 1. A color change cleaning method in which a single robot performs a multi-color top-coating process while performing a combination of a coating process and a cleaning process, wherein a coating color indicating plate mounted on a carrier is provided by a photoelectric tube provided at an entrance of a coating booth. Detects and identifies the same color, non-avoidance color, and avoidance color for the work from the identification holes perforated in the paint color indication plate.If the color is the same, the coating gun is not washed. When the robot has returned to its original position after painting is completed, the painting gun is washed, and in the case of the avoidance color, a space for one carrier is created between the work currently being painted and the work at the booth entrance. A color change cleaning method, wherein the paint gun is cleaned by using the empty space of the one unit after returning to the original position.