JPS5990651A - Electrostatic painter - Google Patents

Abstract

PURPOSE:To enable painting operation always in a safe state by interrupting the voltage impressed on a static electricity generation circuit by an interruptor for generation of static electricity while an electrostatic painter and a substrate are not grounded. CONSTITUTION:A conductor W2 for an electrostatic painter for grounding the reference potential wire of said painter, and a conductor W4 for a substrate 3 for connecting said substrate to the reference potential wire of the electrostatic painter are provided. A defective grounding signal is generated in a means Tr1 for detecting defective grounding when the grounding of the reference potential wire of the painter by the conductor W2 is defective; further, a defective connection signal is generated in a means Tr2 for detecting defective connection when the connection between the substrate 3 and the reference potential wire by the conductor W4 is defective. The outputs from the means Tr1, Tr2 are received in a control circuit 4 which generates an interruption signal when at least one of the defective grounding signal and the defective connection signal is generated A means 6 for controlling voltage interrupts the voltage impressed on a static electricity generation circuit 7 in accordance with the above-mentioned interruption circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic coating machine that coats a grounded object with a coating plate charged by a circuit.

In the electrostatic coating machine described in "=", it is necessary to ground the electrostatic coating machine and the object to be coated from the viewpoint of its function (coating efficiency) and safety. If the grounding is not done properly, if the user paints without realizing it, static electricity will gradually accumulate in the electrostatic atomizer and the object to be coated, resulting in There is a risk that this may lead to accidents such as a fire or other accidents.

SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide an electrostatic coating machine that can perform painting operations in a safe manner at all times.

The purpose of this is to use the electrostatic coating machine (Nioshi A) mentioned at the beginning.
This is achieved by providing an electrostatic generation cutoff device that cuts off voltage application to the electrostatic generation circuit when the electrostatic coating machine and the object to be coated are grounded.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to drawings (two diagrams) showing embodiments thereof.

In the accompanying drawing, the electrostatic generation shield 1111 M1 enclosed by a chain line is installed inside an electrostatic coating machine (not shown), for example, in the J electrostatic generation device, or as a separate unit from the electrostatic coating machine. An additional (two-pronged G) is applied to the paint sprayer. This electrostatic generation cutoff device 1 has two connectors C0NI and CON.
2 and these connectors C0NI.

CON2 connects to other connectors C0N1' and C, respectively.
ON2'E can be connected. At the time of injury (24)
↓ Same - The terminals shown in the figure on the right are connected to each other. The terminal ■ of the connector C0NI is connected to the base of the transistor Tri (two terminals connected to each other, and the other terminal ■ is the reference potential VO+2
weigh. - On the other hand, the terminal ■ of the connector CON2 is connected to the base of the transistor Tr2, and the terminal ■ is connected to the reference potential ■o like C0N1. Regarding connector C0N1' to be connected to connector CON 1, terminal ■ is connected to conductor W1.
and the terminal (2) are both connected to the grounding wire 2 via the conducting wire W2. The grounding wire 2 is, for example, buried in the premises. Also, regarding the connector CON2' to be connected to the connector CON2, the terminal ■ is connected through the conductor W3, and the terminal ■ is connected through the conductor W4, both of which are coated. This configuration connects C0N1 and C0N1.
', CON2 and CON2' are connected, the base of the transistor Try is connected to the reference potential ■o via the conductor W1, the ground line 2 and the conductor W2, and the base of the transistor Tr2 is connected to the conductor W3 and the object to be coated. 6 and conductor W4
It leads to the reference potential Vo via.

The collector terminals of the transistors Tr1 and Tr2 are connected to the input terminal (2) or the input terminal (2) of the control circuit 4, respectively. The control circuit 4 is configured as a so-called AND circuit, and outputs "1" to the output terminal (2) only when "1" is input to the input terminals (2) and (2). The output terminal (3) of the control circuit 4 is connected to the transistor Tr3. Tr
4, and when "1" is generated at the output terminal (2), the switch 5 is turned on and the terminals (2) and (2) of the relay 6 are short-circuited. A constant voltage element B from a power supply (not shown) is applied to the terminal ■ of the relay B, while the input line of the electrostatic capacitance generating circuit 7 is connected to the other terminal ■, so the terminal of the relay 6 is connected as described above. When the terminal (2) and the terminal (2) are short-circuited, the constant voltage element B is applied to the electrostatic generation circuit 7.

Since the electrostatic generation cutoff device 1 according to the present embodiment is configured as described above, as long as the conductors W2 and W4 are properly connected to the reference potential vo, the electrostatic generation cutoff device 1 can be connected to the object to be coated 3 and 1, therefore any electrostatic coating machine that stores its blocking bag @1 is grounded 1x.

In this case, the base potentials of transistors Tr1 and Tr2 are both reference potential V. Therefore, all transistors are turned off, and therefore terminal 5 of circuit 4, ■
``1'' is input. As a result, "1" is obtained at the output terminal (2) of the circuit 4, the switch 5 is turned on, and the relay 6 is activated.

As voltage +B is applied to the electrostatic generation circuit 7 due to the operation of S[.-6, the voltage +B is ejected from the electrostatic coating machine (not shown) and applied to the object to be coated (the coating material to be coated is charged). Thus, as long as the electrostatic coating machine and the object 3 to be coated are grounded, proper electrostatic coating will be performed.

If a break occurs in the conductor W2 or if the connection between C0N1 and C0N1' is insufficient, the electrostatic coating machine will not be grounded, and therefore the object to be coated will not be grounded. Continuing the electrostatic painting operation in such a state is extremely dangerous for the reasons mentioned above, so in this embodiment, in this case, the voltage to the electrostatic generation circuit 7 is changed as follows. Measures have been taken to automatically cut off the application to prevent static electricity from being generated by electrostatic coating machines, etc. That is, for example, if the conducting wire W2 is disconnected, the base potential of the transistor Tr1 is no longer the quasi-potential ■o, so that the transistor T
r1 is turned on, and therefore "-0" is sent to the input terminal (3) of the circuit 4. As a result, the output of terminal ■ is r
OL, the switch 5 is turned off, and the relay 6 cuts off the voltage application to the electrostatic generation circuit 7L.

In addition to the case described in 2 above, if the conducting wire W4 is broken, the object to be coated 6 will not be grounded, so in this case as well, the action of imparting charge to the paint must be stopped. , the transistor Tr2 acts in the same manner as the transistor Tr1 in the above description, and the voltage application to the electrostatic generation circuit 7 is cut off.

If both conductors W2 and W4 are disconnected,
Since both transistors Tr1 and Tr2 are turned on, the above-mentioned blocking effect can naturally be obtained in this case as well.

As described above, in this embodiment, if the grounding of at least one of the electrostatic coating machine and the object to be coated is poor, the action of imparting a charge to the paint is automatically stopped. Unnecessary electrostatic charge is prevented, and painting work can always be performed in a safe state.

In addition, in the embodiment described above, IJ L--6 is used to cut off the voltage application, but in addition to this, the above cut-off can also be performed using other circuits, such as cutting off the signal 5 system. You can do it as well.

Furthermore, by attaching a notification means, such as a light emitting diode, a buzzer, or a neon tube to the electrostatic generating circuit @1, it is possible to notify the operator at the same time that the voltage application has stopped. good.

Although the present invention has been described above with reference to examples, the present invention may be applied to electrostatic generation and cutoff devices other than those of the above-mentioned embodiments.

[Brief explanation of the drawing]

The accompanying drawings [ ] are electrical circuit diagrams of an electrostatic generation cutoff device according to an embodiment of the present invention. B...Power supply voltage 7...Electrostatic generation circuit 6...
・Object to be coated 1...Static electricity generation cutoff device Vo...
・Basic potential w2...Conductor wire for paint machine W4...
Conductor wire for coated objects

Claims (2)

[Claims] (1) Paint charged by an electrostatic generation circuit activated by the application of power supply voltage (-) An electrostatic coating machine characterized by being provided with an electrostatic generation cutoff device that cuts off voltage application to the electrostatic generation circuit when at least one of the electrostatic generation circuits is not grounded. (2) A conductive wire for the electrostatic atomizer to ground the reference potential wire of the electrostatic atomizer, a conductive wire for the object to be coated to connect the object to be coated to the reference potential wire of the electrostatic atomizer, and a conductor for the atomizer a grounding failure detection means that generates a grounding failure signal when the reference potential line of the electrostatic atomizer is poorly grounded by the conductor; and a connection between the object to be coated and the reference potential line by the object conductor; a connection failure detection means that generates a connection failure signal when there is a failure; and a connection failure detection means that receives the outputs of the first stage of the ground failure detector and the connection failure detection means when at least one of the ground failure signal and the connection failure signal is generated. The scope of the patent pursuit is characterized in that it has a control circuit that sometimes generates a cutoff signal, and a voltage control means that cuts off voltage application to the electrostatic generation circuit based on the cutoff signal from the control circuit. The electrostatic coating machine according to paragraph 1.