JPS60102976A - Powder coating method - Google Patents

Abstract

PURPOSE:To recover a coating material at favorable efficiency and reduce loss of the coating material at the time of changing color, by a method wherein a coating material recovering booth is fixed on the lower side of a spray gun with a predetermined spacing therebetween, and a work is inserted between the gun and the recovering booth. CONSTITUTION:The spray gun 1 is suspended from the ceiling, is fixed on the upper side of the work 2, a coating material is ejected downward, and the coating material recovering booth 3 is fixed on the lower side of the work 2. Accordingly, recovery of the coating material in powder coating can be performed at favorable efficiency, and loss of the coating material at the time of changing the color can be reduced.

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 recovery booth.2 Inside the recovery booth, the coating gun is moved up and down while spraying paint. There are three types of coating methods in practice, classified according to the driving method of the coating gun that sprays the paint: the two-wheeled vehicle method, the fixed gun method, and the autoreciprocating method.

In the handcart method, as shown in FIG. 6(A), one worker a enters the collection booth b and collects the work himself.

This is a method of painting by moving the coating gun d up and down according to the shape of the object to be coated C''.However, the handcart method requires the skill of two workers and is not suitable for forming a uniform coating film. Not yet.

In the fixed gun method, as shown in FIG. 6(B), a plurality of painting guns e are arranged in a vertical row at appropriate intervals.

This is a method of painting by simultaneously ejecting the paint from the paint gun e and moving the object to be coated only in a fixed direction.

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.

As shown in Figure 6 (C), the autoreciprocating method uses an autoreciprocator to automatically move the coating gun g up and down according to the shape of the object to be coated, instead of the operator in the handcart method. In this method as well, the conveyor only transports the object to be coated, and the conveyor is adapted to the size of the object to be coated, and the area over which the paint is spread depends on the size of the shape of the object to be coated. As with the fixed gun method, a large recovery booth is also required.Also, if the object to be coated is a net-like object, the coating efficiency is poor as the paint passes through the object ( 2) It is necessary to eject powder many times the body weight (essentially needed to spray the paint inside the collection booth and paint the object to be coated).

In addition, in order to change the paint color, it is necessary to clean every corner 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 there was a large loss of paint during replacement.

In view of these points, the present invention provides a powder coating method that has good paint recovery efficiency in powder coating, reduces paint loss during color changes, and can perform coating with an efficiency of <1% in a small space. The purpose is to provide

The present invention fixes a paint gun and a paint recovery booth provided at a distance below the paint gun, inserts an object to be coated between the paint gun and the paint recovery booth, and forms a shape of the object to be coated. This powder coating method is characterized by moving the object to be coated according to the

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

In FIG. 1, a painting gun 1 is suspended from the ceiling,
It is fixed to one side of the object 2 to be coated so as to spray paint downward, and a paint recovery booth 3 is fixed below the object 2 to be coated. The recovery port 4 of the paint recovery booth 3 has a recovery area slightly larger than the ejection area of the paint gun 1,
Powder is prevented from leaking from the paint recovery booth 3.

The object to be coated 2 is connected to an arm 7 of a robot 6 by a U-shaped support fitting 5, and can be kept stationary at will under the control of the robot 6. The Zunawaji Robo-7to 6 has a control pattern (see FIG. 4) stored in advance according to the shape of the object 2 to be coated.

The object 2 to be coated is moved so that the distance 11 between the object 2 and the coating gun 1 is always kept constant, and the entire surface of the object is coated.

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 initialized manually 8 in advance according to the shape of the object 2 to be coated, and the setting input is performed by an input interface circuit 9. Control device 10
The data is stored on the memory 11 via. The control device 10 includes a position detection sensor for checking whether the surface of the object 2 to be coated is always within a predetermined spray diameter of the coating gun 1. , signals from the detection unit 12 are also input into the control device 10. From the control device 10, a robot drive circuit 13 that drives the arm 7 of the robot 6 is provided.

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.

In the following, the control for driving the robot 6 will be explained based on the procedure when N=1 according to the flowchart shown in FIG.

In FIG. 5, initial settings are made in accordance with the shape of the object 2 to be coated in step (2). For example, a bit indicating whether to shift by one rotation, a bit indicating whether to move or not, and time TI, "I"2. T3... series of information (4th
(see diagram) manually. In step (2), the position detection section 1
In step 2, it is determined whether the object 2 to be coated is in a predetermined position, and if it is in the predetermined position, the process moves to step ■ to start painting, but if it is not in the predetermined position, step Delay until entering position. In step ■, painting is continued for a set time T1, and in step ■, the gun drive circuit 17 is stopped (signal B is sent to stop the painting gun L. Furthermore, in step ■, it is determined whether the rotating bit is turned on or not.
If the rotation pitch I is turned on, a signal is sent to the gun drive motor 15 and the robot drive circuit 13 in step 2 to rotate the object to be coated.

When you confirm that you have rotated the specified rotation angle in step ■,
In step [phase]] set ``1 hour''' and ``2 hours'' and return to step ■. On the other hand, if it is determined in step ■ that the rotating bit is not up, then in step °■ it is determined whether the moving bit is up.

When the movement bit is up, the object 2 to be coated is moved in step @. When movement is confirmed in step [phase], T1 time is set as T3 time in step (2) and the process returns to step (2).

On the other hand, if the rotating bit is not set at step ■ and the moving bit is not set at step ■, that is, the fourth
Painting ends when the blank bit shown in the figure is reached. From now on N=
Repeat steps 2, 3, etc.

Please note that the painting gun must be fixed at all times to prevent minute displacements such as swinging. You don't have to.

Furthermore, once the operation time corresponding to each step 7 for controlling the robot 6 is determined, one time series program may be given to the robot 6 in advance in place of the position detecting section 12 described above.

As described above, the present invention fixes the paint gun above, fixes the paint collection booth below the paint gun at a distance, and inserts the object to be coated between the paint gun and the paint collection booth. Since the object to be coated is moved according to the shape of the object to be coated, the coating can be done more efficiently and the coating equipment can be simplified. In other words, since the paint recovery booth &,l: is fixed 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, there is a paint gun above.

A paint collection booth is installed below, making paint collection efficient. In addition, since the paint collection booth is smaller, changing one color can be done easily and reducing paint loss when changing two colors.Furthermore, the drive means for moving the object to be coated can be installed outside the paint collection booth. Therefore, the driving means does not require a visiting device, and the equipment can be simple and the cost can be reduced.

[Brief explanation of drawings]

Figures 1 to 5 illustrate embodiments of the powder coating method of the present invention, with Figure 1 being a front view showing an overview of the coating device, Figure 2 being
The figure is an open plan view, FIG. 3 is a block diagram showing the specific configuration of the control device, FIG. 4 is an example of a control pattern input to the control device, and FIG. 5 (A) and (B) are a series of Flow chart showing the flow of control in Fig. 3, Fig. 6 (A) (B) (C
) is a schematic diagram showing a conventional painting method. 1...Painting gun, 2...Object to be painted 3...Paint collection booth, 6...Robot Applicant: Sanei Kogyo Co., Ltd. Figure 3, Figure 1, Figure 4, Figure 5 (A)

Claims (1)

[Claims] ■) Fix a paint gun and a paint recovery booth installed at a distance below the paint gun, insert the object to be coated between the paint gun and the paint recovery booth, and adjust the shape of the object to be coated. A powder coating method characterized by moving the object to be coated accordingly.