JPS6211567A - Automatic coater - Google Patents

Abstract

PURPOSE:To keep an electric circuit away from a coating site by turning a supporting arm to insert a spray nozzle into a work recess, abutting a driving lever on an operating lever to open a valve and atomizing a paint. CONSTITUTION:In an automatic coater for coating a work recess stopped at a specified position, an automobile body is stopped at a specified position, a supporting arm 5 is leveled, a spray nozzle 6 is inserted into the recess of the body, a driving lever 25 is aboutted on the operating lever 24 of an opening and closing valve 23, the valve 23 is opened and coating is started. After coating is finished, the supply of air pressure to a pneumatic cylinder 7 is switched by the action of a control valve mechanism 33 and the cylinder 7 is subjected to contraction operation. Accordingly, the supporting arm 5 is turned downward, the driving lever 25 is separated from the operating lever 24, the opening and closing valve 23 is closed and the supply of a paint to the spray nozzle 6 is stopped. Consequently, the electric circuit is kept away from the coating position.

Description

DETAILED DESCRIPTION OF THE INVENTION A0 OBJECTS OF THE INVENTION +11 Field of Industrial Application The present invention relates to an automatic coating machine that can be stopped at a predetermined position and is capable of coating the concave portions of a transported workpiece.

(2) Conventional technology Conventionally, when coating the concave portions of such workpieces, a worker manually carries out the coating by holding a spray nozzle, or
The coating work is performed automatically using a robot.

(3) Problems to be Solved by the Invention However, when coating is performed by workers, the working environment is not good and uniform coating is difficult. Also, with robots,
Although it can eliminate the disadvantages of manual operation, it is expensive and
Moreover, a solenoid valve is used for supplying and stopping the paint, which consumes a large amount of electricity, and since there are many electrical circuits, it is necessary to make the electrical circuits explosion-proof. Furthermore, the robot
Since the structure is complex, getting paint on it can cause malfunctions.

The present invention has been made in view of the above circumstances, and provides an automatic coating machine that has an extremely simple structure and can separate the electrical circuit from the coating position, thereby enabling uniform coating. The purpose is to

B0 Structure of the Invention (1) Means for Solving Problems According to the present invention, a support arm having a spray nozzle at its tip capable of entering into a recess of a workpiece directs the spray nozzle into the recess of the workpiece stopped at the predetermined position. A pipe is supported on a fixed support and is rotatable between a position where the work is inserted and a position where the work is withdrawn to allow transportation of the work, and is located in the middle of the pipe connecting the spray nozzle and the paint supply source. An on-off valve is provided that is biased in the valve-closing direction and includes an operating lever, and the support arm includes a drive lever that can come into contact with the operating lever and open the on-off valve when the spray nozzle is inserted into the recess. is fixedly installed, and a fluid pressure driving means for rotationally driving the support arm is provided between the support body and the support arm.

(2) Operation When the workpiece stops at a predetermined position, the fluid pressure drive means is activated, the support arm rotates, and the spray nozzle enters the recess of the workpiece. At this time, the drive lever comes into contact with the operating lever and rotates. As a result, the on-off valve opens and paint is sprayed from the spray nozzle toward the recess. After the painting is completed, the support arm is rotated to the retracted position by the fluid pressure driving means, and the opening/closing valve is closed in response to the separation of the drive lever from the operating lever.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIGS. 1 and 2, an automobile body l as a workpiece is conveyed by a conveyance means such as a slat conveyor (not shown). The conveyance of the car body 1 is temporarily stopped at a predetermined position in the middle of the conveyance line, and an automatic coating machine 2 disposed on the side of the car body 1 at that predetermined position is applied to a recess 3 in the car body 1, for example, as shown in FIG. Then, anti-rust wax is automatically applied to a portion of the lower windshield located at the front lower part of the front window.

In FIGS. 4 and 5, the automatic coating machine 2 is shown.

A support arm 5 is rotatably supported at the upper end of the support arm 5, a spray nozzle 6 is fixed to the tip of the support arm 5, and a support arm 5 is provided to rotate the support arm 5. 4 and a pneumatic cylinder 7 as a fluid pressure driving means provided between the support arm 5 and the support arm 5 is fixedly erected on the floor surface 8 on the side of the stopped vehicle body 1. The base end of the support arm 5 is rotatably supported on the upper end of the support column 4 via a shaft 9 parallel to the direction in which the vehicle body 1 is transported.

The support arm 5 has two positions: a substantially horizontal position for allowing the spray nozzle 6 to enter the recess 3, and a retracted position for rotating upward so as not to provide support to the movement of the vehicle body 1, as shown in FIG. A stopper 10 is provided at the upper end of the support arm 4 to prevent the support arm 5 from rotating downward from the horizontal position.

In FIG. 6, the spray nozzle 6 is long, corresponding to almost the entire length of the recess 3, and is formed into a loop shape by bending a pipe. That is, the spray nozzle 6 includes a support part 11 that extends in a straight line parallel to the support arm 5, and a pair of spray parts 12.13 that are spaced apart from each other on a straight line parallel to the support part 11. , a support connection part 14 that connects one end of the support part 11 and one end of one spray part 12, a support connection part 15 that connects one end of the other spray part 13 in the middle of the support part 11, and a center of the recess 3. protrusion 3a of
Support part 11 to connect between re-spray parts 12 and 13 while avoiding
The connecting portion 16 is bent toward the side in a substantially U-shape.

A plurality of spray holes 17 are formed at intervals in the re-spraying section 12.13, but it is difficult to connect the support connecting sections 14.15 and the connecting section 16 to the re-spraying section 12.13. The spray holes 17a provided in the bent portion are set to have a smaller hole diameter than the spray holes 17 in other straight portions.

In such a spray nozzle 6, paint supplied from the other end of the support portion 11 is supplied to both support connection portions 14. , 15 spray parts 12
．． 13 - linearly arranged spray holes 17.17a;
sprayed from.

This spray nozzle 6 is connected to the support arm 5 by the stay 18.
However, between the support arm 5 and the spray nozzle 6, when the spray nozzle 6 is inserted into the recess 3 of the vehicle body 1, a cover 19 that covers the recess 3 is supported by the stay 18. be done.

A paint supply hose 20 for supplying paint is connected to the spray nozzle 6. That is, one end of the paint supply hose 20 is connected to the other end of the support portion 11 . On the other hand, one end of a paint supply hose 22 is connected to a paint pressure tank 21 serving as a paint supply source. Both paint supply hoses 20.22
The other ends are connected to each other via an on-off valve 23 fixed to the support column 4.

The on-off valve 23 is biased in the valve closing direction, and includes an operating lever 24 for opening the valve against the biasing force.

On the other hand, a drive lever 25 is fixed to the base end of the support arm 5, and the drive lever 25 and the on-off valve 23 are connected so that the support arm 5 can move the spray nozzle 6 into the recess 3 of the vehicle body 1. When it is in the horizontal state, the operation lever 24
is arranged so that it is rotated by a drive lever 25 to open the on-off valve 23.

The pneumatic cylinder 7 is a double-acting cylinder, and is supported by a trunnion on a bracket 26 provided in the middle of the support column 4 .

The upper end of the piston rod 27 protruding from the upper part of the pneumatic cylinder 7 is connected to a connecting arm 28 integrally provided at the base end of the support arm 5. Therefore, the support arm 5 is rotationally driven in response to the expansion and contraction operation of the pneumatic cylinder 7.

A pneumatic supply hose 30 having a speed controller 29 in the middle and connected to the head side pneumatic chamber of the pneumatic cylinder 7, and a pneumatic supply hose 30 having a speed controller 31 in the middle and connected to the rod side pneumatic chamber of the pneumatic cylinder 7. The supply hose 32 is connected to a pneumatic supply source 34 via a control valve mechanism 33 . Therefore, the control valve mechanism 33 switches between supplying and releasing air pressure from the rain air pressure supply hoses 30 and 32, thereby causing the pneumatic cylinder 7 to expand and contract.

Next, to explain the operation of this embodiment, the vehicle body 1 is transported by a transport means (not shown), and when a proximity switch (not shown) or the like detects that the vehicle body 1 approaches a predetermined position, the control valve mechanism 33 is activated, air pressure is supplied to the head-side pneumatic chamber of the pneumatic cylinder 7, the pneumatic cylinder 7 is extended, and the support arm 5 is rotated downward.

During this time, the vehicle body 1 is stopped at a predetermined position, and when the support arm 5 is prevented from rotating downward by the stopper 10 and becomes approximately horizontal, the spray nozzle 6 enters the recess 3 of the vehicle body 1.

Furthermore, as the support arm 5 rotates downward, the drive lever 25 comes into contact with the operating lever 24 of the on-off valve 23, and when the spray nozzle 6 enters the recess 3, the on-off valve 23 opens.

Therefore, the paint is sprayed from the paint pressurized tank 21 to the spray nozzle 6.
is supplied, and painting of the recessed portion 3 is started.

In the spray nozzle 6, the supplied paint is conducted from the support part 11 via the two support connections 14.15 to the spray part 12.13, so that the pressure in the spray nozzle 6.6 is approximately equal over its entire length. Almost the same amount of paint is sprayed from each spray hole 17. Moreover, the parts where the dynamic pressure is large, that is, both support connecting parts 14 and 15 and the connecting part 16
and the spray hole 17 at the curved connection part with both the spray parts 12.13.
Since the diameter of the hole a is set to be small, the amount of spray is the same as that of the other spray holes 17 even though the dynamic pressure is large. As a result, the recessed portion 3 is coated almost evenly.

When the painting for a predetermined period of time is completed, the supply of air pressure to the pneumatic cylinder 7 is switched by the action of the control valve mechanism 33, and the pneumatic cylinder 7 is operated to contract. Therefore, the support arm 5 rotates upward, and the supply of paint to the spray nozzle 6 is stopped as the drive lever 25 moves away from the operating lever 24 and the on-off valve 23 closes.

When the support arm 5 is rotated to the upper position as shown in FIG. 4, the operation of the conveyance means is started and the vehicle body 1 is conveyed toward the next process.

In such an automatic painting machine 2, the operation of the on-off valve 23, which switches between supplying and stopping paint, can be controlled by rotating the support arm 5, eliminating the need for the solenoid valves required in conventional robots, and reducing power consumption. The amount can be reduced. Moreover, the pneumatic cylinder 7 also drives the support arm 5.
Therefore, no electric circuit is required as a whole, or even if it is necessary, it can be placed at a location away from the painting area, so there is no need to consider an explosion-proof structure.

In addition, although the spray nozzle 6 is long, it is possible to make the amount of spray from each spray hole 17. , 17a can be avoided as much as possible.

C3 Effects of the Invention As described above, according to the present invention, the support arm having the spray nozzle at the tip capable of entering into the recess of the workpiece is positioned at a position where the spray nozzle enters the recess of the workpiece stopped at the predetermined position, and The valve is rotatably supported on a fixed support between a retracted position to allow transportation of the spray nozzle, and is biased in the valve closing direction in the middle of the pipe connecting the spray nozzle and the paint supply source. An on-off valve is provided with an operating lever, and a drive lever is fixed to the support arm, and the drive lever is capable of contacting the operating lever and opening the on-off valve when the spray nozzle is inserted into the recess. Since a fluid pressure driving means for rotationally driving the support arm is provided between the body and the support arm, the configuration is extremely simple, and furthermore, an electric circuit is not required, or even if it is necessary, it can be located away from the painting area. Since there is no need for a solenoid valve for switching the paint supply, there is no need for an explosion-proof structure and the power consumption is low.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view showing the positional relationship between the vehicle body and the automatic coating machine, FIG. 2 is a view taken in the direction of the ■ arrow in FIG. 1, and FIG. 4 is an enlarged front view of the automatic coating machine, FIG. 5 is a view taken along the V arrow in FIG. 4, and FIG. 6 is an enlarged front view of the spray nozzle. DESCRIPTION OF SYMBOLS 1... Automobile body as a workpiece, 2... Automatic coating machine, 3... Recessed part, 4... Pillar as a support body, 5...
...Support arm, 7...Pneumatic cylinder as fluid pressure driving means, 21...Paint pressure tank as paint supply source, 23...Opening/closing valve, 24...Operation lever, 25
・・・Drive lever

Claims (1)

[Claims] In an automatic coating machine that can be stopped at a predetermined position to paint a recessed part of a workpiece being transported, a support arm having a spray nozzle at its tip capable of entering the recess is configured to spray a spray nozzle into the recessed part of the workpiece stopped at a predetermined position. A pipe is supported on a fixed support and is rotatable between a position where the workpiece is inserted and a position where it is withdrawn to allow transport of the workpiece, and a pipe line connecting the spray nozzle and the paint supply source is provided with a pipe. , an on-off valve that is biased in the valve-closing direction and includes an operating lever is provided on the support arm, and the support arm can contact the operating lever to open the on-off valve when the spray nozzle is inserted into the recess. An automatic painting machine characterized in that a drive lever is fixedly installed, and a fluid pressure driving means for rotationally driving the support arm is provided between the support body and the support arm.