JP3331314B2 - Multi-gun coating equipment for electrostatic spray guns - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION In a control for supplying a low voltage from one low voltage source to a plurality of internally generated electrostatic spray guns, a high voltage charge switch operated in conjunction with triggering of a plurality of electrostatic spray guns is operated. Safety control device in case.

[0002]

2. Description of the Related Art Conventionally, when a multi-color is applied on a coating line, a plurality of electrostatic spray guns are used for the multi-color. However, there is no need to use the electrostatic spray guns at the same time. Installing a low-voltage source for an electrospray gun is wasteful in terms of installation space and installation costs.Therefore, there is no way to supply a low-voltage from one low-voltage source to multiple electrostatic spray guns. Have been. However, in a method of supplying a low voltage from a single low voltage source to a plurality of electrostatic spray guns, in order to prevent a risk that a low voltage is supplied to a plurality of electrostatic spray guns at the same time and a high voltage is generated, A low voltage source is supplied preferentially from a low voltage source only to an electrostatic spray gun that activates a high voltage charge switch linked to the trigger of the electrostatic spray gun by general sequence control, and a low voltage is supplied to other electrostatic spray guns. Control is performed to cut off the supply of the low voltage from the voltage source.

[0003] Therefore, even if the high-voltage charge switch of the B gun is activated for some reason such as maintenance or dropping while the high-voltage charge switch of the A gun among the plurality of electrostatic spray guns is activated, the B gun is not affected. Since the supply of the low voltage from the low voltage source is interrupted, there is no danger of generating a high voltage. However, when the high voltage charging switch of the A gun is first activated and the low voltage is supplied to the A gun from the low voltage source, the B gun's high voltage When the charge switch is also activated, the low voltage from the low voltage source is supplied to the B gun because the high voltage charge switch of the B gun is activated even if the operation of the high voltage charge switch of the A gun is terminated. There was a danger of generating voltage.

When a plurality of electrostatic spray guns are randomly triggered for some reason such as maintenance or dropping, a low voltage is suddenly supplied from a low voltage source to generate a high voltage. There is also a problem that it is difficult for the worker to recognize the danger of the occurrence.

A detailed description will be given with reference to the time chart of FIG. 5. A thick line in the time chart indicates that the high-voltage charge switch of the A-gun is operated to supply the low voltage from the low-voltage source to the A-gun, and the high voltage is applied to the tip. Indicates that it is in a painted state. The dotted line shows B while the high voltage charge switch of A gun is operating.
Even if the high voltage charging switch of the gun is activated, the B gun does not have a low voltage supply from the low voltage source, indicating that no high voltage is generated at the tip. Next, when the operation of the high-voltage charge switch of the A-gun is completed while the high-voltage charge switch of the B-gun is operating, the high-voltage charge switch of the B-gun is operating as indicated by the bold line. This indicates that a low voltage is supplied from a low voltage source and a high voltage is generated.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a multi-gun coating apparatus for supplying a low voltage from a single low-voltage source to a plurality of internally generated electrostatic spray guns, in which a high-voltage charge switch is operated first. Provided is a multi-gun painting apparatus for an electrostatic spray gun which incorporates a control device for safely controlling when a high-voltage charge switch of another electrostatic spray gun is inadvertently activated simultaneously with the electrostatic spray gun.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a control device for supplying a low voltage from a single low voltage source to a plurality of internally generated electrostatic spray guns. When the voltage charging switch is activated, a buzzer alarm, a lamp display, or an electric contact signal is output to incorporate a control device that recognizes the danger to the worker. Provide a spray gun multi-gun coating device. In addition, a control device that outputs a buzzer alarm, a lamp display, or an electrical contact signal and simultaneously shuts off the low voltage supply from the low voltage source to the electrostatic spray gun is incorporated. Provide a multi-gun coating device for an electrospray gun. Alternatively, when a high-voltage charging switch of two or more electrostatic spray guns is operated at the same time, a control device that shuts off a low-voltage supply from a low-voltage source to the electrostatic spray gun is incorporated, and compared with a conventional control method. To provide a multi-gun coating apparatus for electrostatic spray guns with high safety.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention detects the operation of the high-voltage charge switches of a plurality of electrostatic spray guns, and immediately detects the buzzer when the simultaneous operation of the high-voltage charge switches of a plurality of electrostatic spray guns is detected. Many electrostatic spray guns incorporate controls that output a warning, lamp indication, or electrical contact signal, or that alert workers to a hazard by shutting off the low voltage supply from a low voltage source to the electrostatic spray gun. Gun coating equipment.

[0009]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of an embodiment (1) of the present invention, which is a multi-gun coating apparatus for an electrostatic spray gun. FIG. 2 shows a multi-gun coating apparatus for an electrostatic spray gun according to the embodiment (2) of the present invention. FIGS. 3, 4, and 5 are time charts for explaining the operation states of the embodiment of the present invention and the conventional example.

Referring to FIG. 1, a low voltage source 2 for generating and supplying a low voltage to a high voltage generator 5 built in the electrostatic spray guns 4a and 4b is turned on and off in the control box 1. Built-in relays 3a and 3b. Also, the triggers 6a and 4b of the electrostatic spray guns 4a and 4b
When the contact signal when the high voltage charging switches 7a and 7b are operated in conjunction with the relay 6b, the normally open relay 3
The control unit 8 for controlling the closing of the a.3b is built in. Further, a buzzer alarm 9a, a lamp display 9b or an external output port 10 for an electric contact signal, which is activated by activation signals 74 and 75 output from the control unit 8, are built in.

Next, the details of the control will be described with reference to the time chart of FIG. When the high voltage charging switch 7a is operated in conjunction with the operation of the trigger 6a of the electrostatic spray gun 4a, a contact signal 71a is sent to the control unit 8. An operation signal 72a is sent from the control unit 8 to the relay 3a, the contact of the relay 3a is closed, and a low voltage is supplied from the low voltage power supply 2 to the high voltage generator 5 built in the electrostatic spray gun 4a, and the electrostatic spray is performed. A high voltage is generated at the tip of the gun 4a. At this time, paint and air are supplied to the electrostatic spray gun from a paint hose connected to a paint supply source (not shown) and an air hose connected to an air supply source (not shown), and electrostatic painting is performed.

Referring to the time chart of FIG. 4 , a bold line indicates that a high voltage is generated at the tip of only the electrostatic spray gun 4a and that the spray gun 4a is in a painted state. Similarly, when the trigger 6b of the electrostatic spray gun 4b is operated, a high voltage is generated at the tip portion of only the electrostatic spray gun 4b as shown in the time chart thick line in FIG. 4, the coating state.

Next, trigger 6a of electrostatic spray gun 4a
Is activated, a high voltage is generated at the tip of the electrostatic spray gun 4a, and when the trigger 6b of the electrostatic spray gun 4b is triggered due to some cause such as maintenance or dropping, the control unit 8 performs a plurality of operations. When the contact signals 71a and 71b from the high-voltage charge switch are detected at the same time, the buzzer alarm 9a and the lamp display 9b are performed by the operation signal 74,
Let the painter know that another electrostatic spray gun has been triggered. Further, by connecting the external device to the external output port 10 of the electric contact signal 75b from the control unit 8, the external device can be linked.

Referring to the time chart of FIG. 4 , a bold line indicates that a high voltage is generated at the tip of only the electrostatic spray gun 4a and that the spray gun 4a is in a painted state. Indicates that the trigger 6b of the electrostatic spray gun 4b was activated when the electrostatic spray gun 4a was in the painting state, and at this time, the buzzer alarm 9a,
A lamp display 9b is displayed to inform the coating operator that another electrostatic spray gun has been triggered. In this embodiment, the painting state according to the operation of the triggers 6a and 6b is maintained on the electrostatic spray guns 4a and 4b as described above.

FIG. 2 shows an embodiment (2). The control box 1 has a low voltage source 2 for generating and supplying a low voltage to a high voltage generator 5 built in the electrostatic spray guns 4a and 4b, and a low voltage supply. The relays 3a and 3b which turn on and off are built in.
Also, triggers 6a and 6b of the electrostatic spray guns 4a and 4b
When the contact signal when the high-voltage charging switches 7a and 7b are operated in conjunction with the relay is taken in, the normally open type relay 3a.
A control unit 8 for controlling the closing of the 3b is built in. Further, a buzzer alarm 9a, a lamp display 9b, or an external output port 10 for a contact signal, which is activated by an activation signal output from the control unit 8, is incorporated. In this embodiment, when the control unit 8 simultaneously detects the contact signals 71a and 71b from the plurality of high-voltage charging switches, the control unit 8 immediately opens the contact of the normally-closed cutoff switch 11 for low-voltage supply, and sets the low-voltage power supply. In this configuration, the supply of low voltage from the second spray gun 2 to the electrostatic spray guns 4a and 4b is stopped.

In the embodiment (2), when the control section 8 simultaneously detects the contact signals 71a and 71b from the plurality of high-voltage charging switches, the control section 8 opens the contacts of the relays 3a and 3b to open the low-voltage charging switches. Electrostatic spray guns 4a and 4 from source 2
It is also possible to adopt a configuration in which the control for stopping the supply of the low voltage to b is performed and the cutoff switch 11 is omitted. Furthermore, a buzzer alarm 9a, a lamp display 9b, or an electric contact signal that is activated by an activation signal output from the control unit 8 can be output.

In the time chart of FIG. 3 , the bold line indicates that a high voltage is generated at the tip of the electrostatic spray gun 4a and that the spraying is in a painting state. 8 is a state in which the low voltage supply from the low voltage source 2 to the electrostatic spray guns 4a and 4b is stopped when the contact signals 71a and 71b from the plurality of high voltage charging switches are simultaneously detected. Indicates that The dotted line indicates that the high voltage charging switches of the electrostatic spray guns 4b and 4b are operated simultaneously, but no high voltage is generated in either of the electrostatic spray guns.

In the above embodiment, the buzzer alarm, the lamp display, the output of the electric contact signal, and the control for stopping the supply of the low voltage from the low voltage source to the electrostatic spray gun are simultaneously performed according to the management situation of the painting operation. Alternatively, it can be implemented alone. In other words, the management situation of the painting work is good,
If the safety management is sufficient only by the output of the buzzer alarm, the lamp display, and the electric contact signal, the control for stopping the supply of the low voltage from the low voltage source to the electrostatic spray gun may be omitted.
Also, an example is described in which the contact signal when the high-voltage charge switch is activated in conjunction with the trigger of the electrostatic spray gun is described, but the flow of compressed air flowing through the electrostatic spray gun is detected in conjunction with the trigger. It is also possible to take the flow switch type contact signal

[0019]

As described above, when a plurality of electrostatic spray guns are used at random, the generation of a high voltage due to the supply of a low voltage to the plurality of electrostatic spray guns becomes random. By connecting an external device to the buzzer alarm, lamp display, or the external output port of the electrical contact signal from the control unit, the danger of random high voltage generation to the spray gun can be made known to the operator. Can,
In addition, if necessary, the supply of low voltage to the electrostatic spray gun can be stopped, and the danger of high voltage being charged against the intention of the painter can be prevented. This has the effect of enabling multiple gun painting operations.

[0020]

[Brief description of the drawings]

FIG. 1 is a block diagram showing an outline of an embodiment (1) of the present invention.

FIG. 2 is a block diagram showing an outline of an embodiment (2) of the present invention.

FIG. 3 is a time chart of an embodiment ( 2 ) of the present invention.

FIG. 4 is a time chart of the embodiment ( 1 ) of the present invention.

FIG. 5 is a time chart diagram of a conventional example.

Claims (3)

(57) [Claims] A high voltage charge switch and a high voltage generator are provided.
A plurality of individually provided electrostatic spray guns and each of said high voltage
An electrostatic device comprising: a low-voltage source for supplying a low voltage to a generator; and a control device that outputs a buzzer alarm, a lamp display , or an electrical contact signal when two or more of the high-voltage charging switches operate simultaneously. Multi-gun painting equipment for spray guns. 2. The control device according to claim 1, wherein the high-voltage charge switch is
It characterized the this <br/> for cutoff control two or more simultaneously operating Then low voltage supply, the multi-gun painting apparatus of an electrostatic spray gun of claim 1. 3. A high voltage charge switch and a high voltage generator.
A plurality of individually provided electrostatic spray guns and each of said high voltage
Multi-gun painting of an electrostatic spray gun comprising: a low-voltage source for supplying a low voltage to a generator; and a control device for shutting off the low-voltage supply when two or more of the high-voltage charging switches operate simultaneously. apparatus.