JPH0442069B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in powder coating methods.

In conventional powder coating, the objects to be coated are hung on a conveyor at regular intervals and transported into a tunnel-shaped collection booth, and paint is sprayed by moving a paint gun up and down inside the collection booth. There are three types of coating methods in practical use: manual coating, fixed gun coating, and autoreciprocating coating.

In the manual coating method, as shown in FIG. 6A, a worker a enters the collection booth b and paints the object c by moving the coating gun d up and down according to the shape of the object c. It is. However, manual coating requires skill on the part of the operator and is not suitable for forming a uniform coating film.

In the fixed gun method, as shown in Figure 6B, a plurality of painting guns e are arranged in a vertical line at appropriate intervals, and the painting guns e are made to eject at the same time, and the object to be coated is moved only in a fixed direction. This is a method of painting. However, in the fixed gun method, it is necessary to provide a large number of painting guns e corresponding to the length of the object to be coated, and since the painting guns e are moved, the paint is sprayed over a wide area, so the collection booth b needs to be large. Become.

In the autoreciprocating method, instead of the operator in the manual coating method, the autoreciprocator f automatically moves the coating gun g up and down according to the shape of the object to be coated. It's a method. In this method as well, the conveyor only transports the object to be coated, and it does so according to the size of the object to be coated, and the area over which the paint is spread increases depending on the size of the shape of the object to be coated. As with the fixed gun method, a large collection booth is required.
In addition, if the object to be coated is a net-like object, the coating efficiency is poor because the paint passes through the object, and the paint is scattered inside the collection booth, reducing the amount of powder actually required for painting the object. It must be able to eject twice as much powder. In addition, in order to change the paint color, it is necessary to clean every corner of the inside of the collection booth and collection equipment, which requires a lot of effort and time in the conventional tunnel-shaped collection booth. There was a problem in that the paint loss over time was large.

In view of these points, the present invention provides a powder coating method that has good paint recovery efficiency in powder coating, can reduce paint loss during color changes, and can perform painting efficiently in a small space. The purpose is to

The present invention fixes a paint gun and a paint collection booth provided at a distance almost directly below the paint gun, and the size of the paint collection booth is smaller than the size of the object to be coated, and its collection port is connected to the paint A workpiece connected to the arm of a robot is inserted between the painting gun and the paint collection booth, and the workpiece has an area slightly larger than the paint ejection area of the gun, and the robot adjusts the shape of the workpiece. This powder coating method is characterized by moving the object to be coated accordingly.

Hereinafter, the configuration of the present invention will be explained based on the drawings.

In FIG. 1, a paint gun 1 is suspended from the ceiling and fixed above an object 2 to be coated so as to spray paint downward, and a paint recovery booth 3 is fixed directly below the paint gun 1. Ru. The size of the paint recovery booth 3 is smaller than the size of the object 2 to be coated, and its recovery port 4 has a recovery area slightly larger than the ejection area of the painting gun 1, so that powder does not leak from the paint recovery booth 3. It is assumed that there is no such thing.

The object 2 to be coated is connected to an arm 7 of a robot 6 by a U-shaped support fitting 5, and can be moved freely under the control of the robot 6. That is, the robot 6 stores a control pattern (see FIG. 4) in advance according to the shape of the object 2 to be coated, and controls the robot 6 so that the distance between the object 2 and the coating gun 1 is always kept constant. 2 to coat the entire surface of the object.

Hereinafter, specific control means for the robot 6 and the coating gun 1 will be explained with reference to FIG.

In FIG. 3, a control pattern (see FIG. 4) is input in advance according to the shape of the object 2 to be coated, and the setting input is stored on the memory 11 via the input interface circuit 9 and the control device 10. be remembered. The control device 10 also controls signals from a position detection unit 12 having a position detection sensor that confirms whether the surface of the object 2 to be coated is always within a predetermined spray diameter of the coating gun 1. input into the device 10. From the control device 10, a robot drive circuit 13 that drives the arm 7 of the robot 6 is connected.
Then, appropriate signals are sent out according to a program flowchart to be described later, and the robot 6 is driven by the signals. Further, the control device 10 sends a signal to the gun drive motor 15 that causes minute displacements such as the swing angle of the coating gun 1, and also operates the gun drive circuit 17 via the converter 16. Powder is ejected from the coating gun 1.

The control for driving the robot 6 will be explained below based on the procedure when N=1 along the flowchart shown in FIG.

In FIG. 5, initial settings are made in accordance with the shape of the object 2 to be coated. For example, a series of information such as a bit indicating whether to rotate, a bit indicating whether to move, and times T1, T2, T3, etc. (see FIG. 4) are input. In the step, the position detecting section 12 determines whether or not the object 2 to be coated is in a predetermined position. If it is in the predetermined position, the process moves to the step and starts painting, but if it is not in the predetermined position, the object to be coated is detected in the step. 2 is in place. Set time in step
Painting is continued during T1 and a stop signal is sent to the gun driving circuit 17 in step T1 to stop the painting gun 1. Furthermore, it is determined in step whether or not the rotation bit is on, and if the rotation bit is on, a signal is sent to the gun drive motor 15 and the robot drive circuit 13 in step to rotate the object to be coated.
When it is confirmed that the rotation has been completed by a predetermined rotation angle in the step, the time T1 is set as the time T2 in the step and the process returns to the step. On the other hand, if it is confirmed in the step that the rotation bit has not elapsed, then in the next step it is determined whether or not the movement bit has elapsed, and if the movement bit has elapsed, the object 2 to be coated is moved in the step. When the movement is confirmed in the step, the step sets T1 time to T3 time and returns to the step. On the other hand, if the rotary bit is not activated in the step and the moving bit is not activated in the step, that is, if the blank bit is reached as shown in FIG. 4, the painting ends. After that, repeat N=2, 3, etc. sequentially.

Note that the coating gun does not need to be fixed at all times and not subject to minute displacements such as swinging.

Furthermore, once the operation time corresponding to each step for controlling the robot 6 is determined, the position detection section 1 described above
Instead of step 2, a time-series program may be given to the robot 6 in advance.

As described above, the present invention fixes the paint gun upward and fixes the paint recovery booth at a distance almost directly below the paint gun, and the size of the paint recovery booth is larger than the size of the object to be coated. The small collection port has an area slightly larger than the paint ejecting area of the paint gun, and the object to be coated connected to the arm of the robot is inserted between the paint gun and the paint recovery booth. Since it moves according to the shape of the object to be coated, coating can be done efficiently and the coating equipment can be simplified. In other words, since the paint collection booth is fixed directly below the fixed paint gun,
The size of the paint recovery booth need only be determined by the ejection area of the paint gun, and the paint recovery booth can be made smaller. Moreover, since the object to be coated is inserted between the painting gun and the paint recovery booth and moved according to the shape of the object, the coating gun and the paint recovery booth can be made small regardless of the size of the object to be coated. Furthermore, since the paint gun is installed above and the paint recovery booth is installed directly below, the paint recovery efficiency is high. Also,
Since the paint collection booth is smaller, it is easier to change colors, and paint loss during color changes can be reduced. Furthermore, the driving means for moving the object to be coated can be installed outside the paint recovery booth, and the driving means does not require a safety device, making the equipment simple and the cost low.

[Brief explanation of drawings]

1 to 5 illustrate embodiments of the powder coating method of the present invention, FIG. 1 is a front view showing an overview of the coating device, FIG. 2 is a plan view of the same, and FIG. 3 is a control device. A block diagram showing a specific configuration, FIG. 4 illustrates a control pattern input to the control device, and FIG. 5 A, B
is a series of flowcharts showing the control flow in FIG. 3, and FIGS. 6A, B, and C are schematic diagrams showing the conventional painting method. 1...painting gun, 2...object to be painted, 3...paint collection booth, 6...robot.

Claims (1)

[Claims] 1. A paint gun and a paint collection booth installed at a distance almost directly below the paint gun are fixed, and the size of the paint collection booth is smaller than the size of the object to be painted, and its collection port is located at the side of the paint gun. An object to be coated, which has an area slightly larger than the paint ejection area and is connected to the arm of a robot, is inserted between the painting gun and the paint collection booth. A powder coating method characterized by moving the object to be coated.