JPH0130542B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic coating apparatus installed in a coating line in which objects to be coated are continuously conveyed in one direction.

[Prior art]

One type of automatic painting device includes a driven member that moves back and forth by a reciprocating drive device, a spray gun that is supported by the driven member and sprays paint onto the object to be painted, and a drive control of the reciprocating drive device. There is an automatic painting device equipped with a control device that does this.

However, in this type of automatic painting equipment,
The position of the spray gun is controlled by a control device equipped with a memory mechanism that remembers the shape of the painted surface of the object to be painted, and the distance between the painted surface of the object to be painted and the spray gun (spraying distance) is always maintained at a substantially constant value. I try to keep it. As a result, when painting the upper surface of an automobile body, etc., which is not flat, the painting can be done extremely effectively.

[Problem that the invention seeks to solve]

However, since the control device in such an automatic painting apparatus is very expensive, there is a demand for the development of a cheaper automatic painting apparatus.

[Means for solving problems]

The present invention has been made in order to meet such demands, and in the above-mentioned type of automatic painting apparatus, a plurality of photoelectric switches are disposed on the driven member along the moving direction of the driven member, and when the object to be painted is transported, The output of each of the photoelectric switches controls the operation of the control device to control the position of the spray gun.

[Action/effect of the invention]

As a result, in the present invention, the spray gun can be made to follow the painted surface of the object to be painted by simply arranging a plurality of photoelectric switches in a specific arrangement state, and this type of automatic painting device can be It can be provided at a lower cost than the

〔Example〕

FIG. 1 schematically shows an example in which the present invention is applied to an automatic painting system for painting the upper surface of an automobile body. 11 and conveyed in one direction from right to left by conveyor rails 12. Further, in this automatic painting system, the gate-shaped upper surface automatic painting device 13 is connected to the conveyor rail 12.
It is installed across the Top automatic coating device 1
3 is equipped with an elevating member 15, which is a driven member that is reciprocated in the vertical direction by a pneumatic cylinder 14, which is a reciprocating drive device, and a spray gun 16 is provided at the lower front end of the elevating member 15, pointing downward. It is provided. The spray gun 16 is used to spray the car body 1.
The injection timing is controlled by a photoelectric switch 17 that detects and outputs the entry and passage of zero, and a timer switch (not shown) connected to this photoelectric switch 17. After the detection, spraying starts after a time delay when the front end of the automobile body 10 is conveyed below the spray gun 16, and the photoelectric switch 1 is activated.
7 detects the passage of the automobile body 10, the injection ends after a time delay when the rear end of the automobile body 10 is conveyed below the spray gun 16.

Therefore, in this embodiment, the elevating member 15
Three sets of transmission type photoelectric switches 21, 22, and 23 are arranged directly below the left and right supports 20 (only one is shown in the figure) along the moving direction of the elevating member 15. . Photoelectric switch 2
Reference numerals 1, 22, and 23 move up and down integrally with the lifting member 15, detect the entry of the automobile body 10, output an output, and actuate the cylinder 14 via the pneumatic control device 100 shown in FIG. Lifting member 1 by controlling
5 to maintain a constant distance between the spray gun 16 and the surface to be coated, each of which is equipped with a light projector and a light receiver. In addition, each emitter and receiver are equipped with a photoelectric switch 2 to avoid mutual interference.
The light projectors 1, 22 and 23 are provided alternately on the right side in the direction of movement of the automobile body 10, the light projector of the photoelectric switch 22 on the left side, and the light projector of the photoelectric switch 23 on the right side.

The pneumatic control device 100 includes photoelectric switches 21 and 2.
A solenoid valve 10 whose operation is controlled by 2 and 23.
When the photoelectric switches 21, 22, and 23 both detect the entry of the automobile body 10 and output an output, only the solenoid valve 101 operates, and both the photoelectric switches 21, 22 detect the entry of the automobile body 10. When the photoelectric switch 21 detects and outputs an output, only the solenoid valve 102 operates, and when only the photoelectric switch 21 detects and outputs the entry of the automobile body 10, the solenoid valve 10 operates.
1, 102, and 103 are all inoperative, and when none of the photoelectric switches 21, 22, and 23 output an output, only the solenoid valve 103 is activated. Solenoid valve 101
is a 4-port, 2-position switching valve, which connects pipe P1 to pipe P2 and connects pipe P3 to the atmosphere when not in operation, and connects pipe P1 to pipe P3 and connects pipe P3 to the atmosphere when in operation. Connect P2 to atmosphere. The pipe P1 is connected to an air header (air pressure source) 106 via a pressure reducing valve 104 and a filter 105, and is also connected to solenoid valves 102, 103 and a switching valve 107. The pipe P2 is connected to the right pilot port 108a of the 2-port 2-position switching valve 108. The pipe P3 is connected to the left pilot port 108b of the switching valve 108, and is also connected to the shuttle valves 109 and 110.

The solenoid valve 102 is a 3-port, 2-position switching valve, which shuts off the pipe P1 when not in operation, and also closes off the pipe P1.
4 is connected to the atmosphere, and in operation the pipe P1 is connected to P4. Pipe P4 is shuttle valve 110, 111
It is connected to the. The solenoid valve 103 is a 3-port, 2-position switching valve, which shuts off the pipe P1 and connects the pipe P5 to the atmosphere when it is not in operation, and connects the pipe P1 to the pipe P5 when it is in operation. The pipe P5 is connected to the shuttle valve 111 and to the right pilot port 112a of the 4-port 3-position switching valve 112. The shuttle valve 111 is connected to the shuttle valve 109 by a pipe P6, and is also connected to the switching valve 1.
The pilot port 112b on the left side of 12 is connected to the pipe P.
7 to the shuttle valve 110.

The switching valve 107 is a 3-port 2-position switching valve,
When air pressure is not applied to the pilot port 107a, the pipes P1 and P8 are connected, and when air pressure is applied to the pilot port 107a, the communication between the pipes P1 and P8 is cut off, and the pipe P8 is connected.
communicate with the atmosphere. Pilot port 107a
is connected to the shuttle valve 113 (connected to the shuttle valve 109 by a pipe P10) through a pipe P9, and to the left pilot port 114b of the two-port two-position switching valve 114. The pipe P8 is connected to the right pilot port 114a of the switching valve 114.

The switching valve 112 has both ports 112a and 112b.
When no air pressure is applied to the pilot port 112a, both pipes P12 and P13 are cut off from the atmosphere and the pipe P11 in the illustrated position, and when air pressure is applied only to the right pilot port 112a, the pipes P11 and P12 and the pipe P13 is connected to the atmosphere, and when air pressure is applied only to the left pilot port 112b, the pipes P11 and P13 are connected and the pipe P12 is connected to the atmosphere. Pipe P11 is connected to air header 117 via pressure reducing valve 115 and filter 116, pipe P12 is connected to both switching valves 108 and 114, and pipe P13 is connected to pneumatic cylinder via speed controller (variable orifice) 118. 14 is connected to the lower chamber R1. Switching valve 108, 11
4 is a 2-port 2-position switching valve having fixed orifices 108c and 114c, and when air pressure is applied to pilot ports 108a and 114a, communication between pipes P12 and P14 is cut off, and air is released to pilot ports 108b and 114b. Orifice 108 fixes pipes P12 and P14 when pressure is applied.
c, 114c. Pipe line P14 is connected to upper chamber R2 of pneumatic cylinder 14 via speed controller 119.

In this embodiment configured in this way, when the conveyor rail 12 is in operation, the photoelectric switches 17, 2
1, 22, and 23 are in a state in which entry and passage of the automobile body 10 can be detected. When the automobile body 10 is in the illustrated position, the photoelectric switches 21, 22, 23
Both do not detect the automobile body 10 and do not output any output.
At this time, the paint is not injected from the spray gun 16, and the solenoid valve 1 in the pneumatic control device 100
Only 03 is in operation. Solenoid valve 103
When only the pilot port 112a of the switching valve 112 is in operation, the air pressure applied to the pipe P1 is applied to the right pilot port 112a of the switching valve 112 through the pipe P5, and the shuttle valve 111, the pipe P6, the shuttle valve 109, The air pressure in the pipe P11 is applied to the left pilot port 114b of the switching valve 114 and the pilot port 107a of the switching valve 107 through the pipe P10, the shuttle valve 113, and the pipe P9, and the air pressure in the pipe P11 is applied to the left pilot port 114b of the switching valve 114 and the pilot port 107a of the switching valve 107. , is provided to the upper chamber R2 of the pneumatic cylinder 14 through the conduit P14 and the speed controller 119. For this reason,
At this time, the elevating member 15 is located at its lower end stop position.

Thereafter, when the automobile body 10 is transported to the left, the paint injection timing of the spray gun 16 is controlled by the photoelectric switch 17, and the pneumatic cylinder 14 is controlled by the photoelectric switches 21, 22, 23 and the pneumatic control device 100. The operation is controlled, and the upper surface (surface to be painted) of the automobile body 10 is automatically painted.

By the way, during this painting, the operation of the pneumatic cylinder 14 is controlled as follows, the positions of the elevating member 15 and the spray gun 16 are controlled, and the distance between the spray gun 16 and the surface to be painted is kept constant. Corrected. That is, when only the photoelectric switch 21 detects and outputs the entry of the automobile body 10,
The solenoid valves 101, 102, and 103 are all inoperative, and the switching valve 112 is in the state shown. For this reason,
Both pipes P12 and P13 are cut off from the atmosphere and pipe P11, and both chambers R1 and R2 of the pneumatic cylinder 14 are in a sealed state, and the operation of the pneumatic cylinder 14 is maintained in a stopped state to support the spray gun 16. The elevating member 15 is maintained in that position.

In addition, a photoelectric switch 2 prevents the entry of the automobile body 10.
1 and 22 are both detected (detecting that the upper surface of the automobile body 10 is changing upward) and output,
Only the solenoid valve 102 operates, and the air pressure applied to the pipe P1 is transferred to the pipe P4, the shuttle valve 110, and the pipe P.
7 to the left pilot port 112b of the switching valve 112, and the pipe P4, the shuttle valve 111, the pipe P6, the shuttle valve 109,
Pilot port 11 on the left side of switching valve 114 through pipe P10, shuttle valve 113 and pipe P9
4b and the pilot port 107 of the switching valve 107
given to a. Therefore, in the switching valve 112, the pipe P11 communicates with the pipe P13 and the pipe P1
2 communicates with the atmosphere, and in the switching valve 114, the pipe P12 and the pipe P14 communicate with each other via an orifice 114c, and the compressed air of the pipe P11 passes through the pipe P13 and the speed controller 118 to the lower chamber of the pneumatic cylinder 14. The air flowing into R1 and the air in the upper chamber R2 flows into the speed controller 119 and the pipe P1.
4. It flows out into the atmosphere through the orifice 114c and the pipe P12, and the elevating member 15 supporting the spray gun 16 is moved upward at a relatively slow speed mainly defined by the orifice 114c.
When all of the photoelectric switches 21 to 23 are raised integrally with this lifting member 15 and a state is reached where only the photoelectric switch 21 detects the automobile body 10, the operation of the pneumatic cylinder 14 is stopped as described above, and the lifting member The spray gun 15 is stopped at the position to maintain a predetermined distance between the spray gun 16 and the surface to be coated.

Furthermore, the photoelectric switches 21, 22, and 23 detect the entry of the automobile body 10 (the entry of the automobile body 10
Detects that the top surface of the device is changing rapidly upward)
When the output is output, only the solenoid valve 101 operates, and the air pressure applied to the pipe P1 is transferred to the pipe P3 and the shuttle valve 1.
10 and the pilot port 112b on the left side of the switching valve 108 through the pipe P7, and the pilot port 108b on the left side of the switching valve 108 through the pipe P3. P10 is applied to the left pilot port 114b of the switching valve 114 and the pilot port 107a of the switching valve 107 through the shuttle valve 113 and the pipe P9. Therefore, in the switching valve 112, the pipe P11 communicates with the pipe P13 and the pipe P12 communicates with the atmosphere, and the switching valve 11
8, 114, the pipes P12 and P14 communicate through the orifices 108c, 114c, and the compressed air of the pipe P11 passes through the pipe P13 and the speed controller 118 to the lower chamber R1 of the pneumatic cylinder 14.
The air in the upper chamber R2 flows into the speed controller 119, the pipe P14, and both orifices 1.
08c, 114c and the pipe P12 into the atmosphere, and the elevating member 15 that supports the spray gun 16 mainly flows through the two orifices 108c, 114c.
is moved upward at a relatively fast speed defined by . In this case as well, all the photoelectric switches 21 to 23 are raised integrally with the lifting member 15 to reach a state where the photoelectric switches 21 and 22 detect the automobile body 10, and then a state where only the photoelectric switch 21 detects the vehicle body 10. As described above, the operation of the pneumatic cylinder 14 and the lifting of the elevating member 15 are stopped,
A predetermined distance is maintained between the spray gun 16 and the surface to be coated.

Furthermore, when the photoelectric switches 21, 22, and 23 do not detect the entry of the automobile body 10 and do not output an output, as in the case of non-painting, only the solenoid valve 103 operates, and the air pressure applied to the pipe P1 is switched. valve 11
2, the pilot port 114b of the switching valve 114, and the pilot port 107a of the switching valve 107. For this reason, the switching valve 11
2, the pipe P11 communicates with P12 and the pipe P13 communicates with the atmosphere, and in the switching valve 114, the pipes P12 and P14 communicate with each other via the orifice 114c, so that the compressed air of the pipe P11 is connected to the pipe P12,
Air flows into the upper chamber R2 of the pneumatic cylinder 14 through the orifice 114c, the pipe P14 and the speed controller 119, and the air in the lower chamber R1 flows out into the atmosphere through the speed controller 118 and the pipe P13, causing the spray gun 16 to flow into the upper chamber R2. The supporting lifting member 15 is moved downward at a speed mainly defined by the orifice 114c. Lifting member 1
5 is lowered to a state where only the photoelectric switch 21 detects the automobile body 10, and when this state is reached, the elevating member 15 is stopped to maintain a predetermined distance between the spray gun 16 and the surface to be coated.

As described above, in this embodiment, the pneumatic cylinder 14 is controlled by the photoelectric switches 21, 22, and 23, which output according to the shape of the surface to be painted of the automobile body 10.
By controlling the operation of the elevating member 15 to maintain the elevating member 15 at a height such that only the photoelectric switch 21 is constantly detecting the automobile body 10, the elevating member 15
and the position of the spray gun 16 on the automobile body 10.
Since the automatic coating apparatus can be made to follow the surface to be coated, the automatic coating apparatus can be made inexpensive without deteriorating the coating quality.

The above explanation is based on one embodiment of the present invention, and the present invention is not limited to the above-mentioned embodiment, but is applicable to various types of coating lines that are installed in a coating line in which objects to be coated are conveyed in one direction and that coat the objects to be coated. The present invention can be implemented by appropriately modifying the automatic painting apparatus described above, and when implementing the present invention, the number of photoelectric switches and the configuration of the pneumatic control device can be modified as appropriate. Note that it is also possible to replace the pneumatic cylinder 14 and the pneumatic control device 100 with a hydraulic cylinder and a hydraulic control device. Furthermore, in the present invention, each photoelectric switch 2
1, 22, and 23 may be arranged at appropriate positions at the lower intermediate portion of the elevating member 15.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing an automatic painting system employing an automatic painting device according to an embodiment of the present invention;
FIG. 2 is a pneumatic control circuit diagram of the automatic painting apparatus shown in FIG. 1. Explanation of symbols, 10... Automobile body (object to be painted), 13... Automatic coating device, 14... Pneumatic cylinder (reciprocating drive equipment), 15... Lifting member (driven member), 21, 22, 23 ...Photoelectric switch.

Claims (1)

[Claims] 1. A driven member installed in a painting line where objects to be painted are continuously conveyed in one direction and moved back and forth by a reciprocating drive device, and a driven member supported by this driven member to spray paint onto the object to be painted. In an automatic painting device comprising a spray gun and a control device for controlling the drive of the reciprocating drive device, a plurality of photoelectric switches are disposed on the driven member along the direction of movement thereof, and An automatic painting apparatus characterized in that the position of the spray gun is controlled by controlling the operation of the control device based on the output of each of the photoelectric switches.