JPH0429770A - High voltage generator for electrostatic painting - Google Patents

Abstract

PURPOSE:To automatically adjust an output voltage value corresponding to a painting condition, by providing a changeover part to the second low voltage power supply part so as to connect the output part of said power supply part and the output part of the first low voltage power supply part to the input part of a high voltage generat ing part so as to change over both of them. CONSTITUTION:When the low AC power supply voltage from a power supply 3 is inputted to the AC power supply input part 61 of the second low voltage power supply part 6, said voltage is rectified by the rectifying circuit 62 of the rear stage of the input part 61 to be outputted as DC voltage through a stabilizing part 63. A command apparatus 7 is connected to the second low voltage power supply part 6. When a code number of a painting condition is inputted to the command apparatus, the output voltage value corresponding to the painting condition is sent out as a command signal. When the command signal is inputted to a signal input part 64, the signal from the input part 64 is sent out to a voltage detecting circuit 66 by a decoder 65, and the output voltage value of the stabilizing circuit 63 is controlled so as to coincide with a command signal value, while command with the voltage value fed back from the output part of the stabilizing circuit 63. By this method, applied voltage can be manu ally adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high voltage generator that applies high voltage to an electrostatic coating gun, and in particular has a function of manually adjusting the applied voltage and a function of automatically adjusting the applied voltage. The present invention relates to a high voltage generator that can be used selectively as needed.

2. Description of the Related Art A conventional example of a high voltage generator for electrostatic coating will be described with reference to FIG. 1.2, which shows an embodiment of the present invention.

A conventional high voltage generator has a low voltage power supply section 1 and a high voltage generation section 2.
It consists of a low voltage power supply 11 (input section 11 of 1,
When the low voltage AC power supply voltage from the commercial power supply 3 is input,
After it is rectified by the rectifier circuit 12, it is output as a low-voltage DC voltage via the power supply circuit 13. The power supply circuit 13 of this low-voltage power supply section I is connected to the inverter 21 of the high-voltage generation section 2 by a connection line λ shown by a broken line in FIG. The voltage receives an oscillation signal from the oscillation circuit 22 and is converted into a high-frequency AC voltage by the inverter 21. Next, the voltage is converted into a high-voltage DC voltage by the Cockcrort falton multi-stage rectification booster circuit 23. The converted signal is output and applied to the electrostatic coating gun 5.

In electrostatic painting, it is common to adjust the voltage applied to the gun 5, that is, the output voltage value of the high voltage generator 2, as appropriate depending on the type of object to be coated and other coating conditions. Conventionally, the alternating current voltage value applied to the rectifier circuit 12 is adjusted by manually operating the slider 14 connected to the rear stage of the input section 11 of the low-voltage power supply section l. A method was used to adjust the final output voltage value.

Problems to be Solved by the Invention However, this method requires manual adjustment each time, which is troublesome especially when coating conditions change frequently, and also has the disadvantage that adjustment errors are likely to occur.

Therefore, with the recent development of simple control means such as microcomputers, in such high voltage generators,
There has been a strong desire for a device that can automatically adjust the output voltage value, which is the applied voltage, in accordance with the coating conditions. On the other hand, however, conventional manual adjustment means are effective, for example, when performing trial coating to determine an appropriate applied voltage.

Means for Solving the Problems The present invention was completed based on these demands, and provides a regulator that converts low-voltage AC power supply voltage into DC voltage and outputs it, and manually adjusts the output value. a first low-voltage power supply unit equipped with a first low-voltage power supply unit; and a first control circuit that converts a low-voltage AC power supply voltage into a DC voltage and outputs it, and controls the output value based on a command signal from a command device connected to the outside. It consists of a low-voltage power supply part 2 and a high-voltage generation part that outputs a high-voltage DC voltage by converting the low-voltage DC voltage into a high-frequency AC voltage and step-up rectifying it. The configuration includes a switching section that switches and connects the input section of the high voltage generating section and the output section of the first low voltage power supply section to the input section of the high voltage generating section.

Effects and Effects of the Invention The present invention has the above configuration, and the second low-voltage power supply unit is capable of controlling the output voltage value based on a command signal from an externally connected command device. If the output voltage value of this low-voltage power supply unit necessary to obtain the applied voltage suitable for various painting conditions is stored in advance along with the painting conditions in the device, and the output voltage value is sent as a command signal. If you input the type of condition to the command device each time the coating condition changes, a command signal will be issued and the output voltage value of this low voltage power supply will be controlled to the voltage value corresponding to that condition, and accordingly, high voltage will be generated. The applied voltage output from the unit is adjusted to be optimal for the coating conditions. Therefore, the applied voltage can be adjusted easily and without error, and the applied voltage can be managed using a computer.

The second low-voltage power supply section also has a switch that connects its output section and the output section of the first low-voltage power supply section, which has the same manual output voltage adjustment function as in the past, to the input section of the high-voltage generation section. Since the second low-voltage power supply section is provided, the second low-voltage power supply section can be used by directly connecting it to the existing high-voltage generator. By switching the switching unit, the automatic adjustment function of the applied voltage by the second low-voltage power supply unit and the manual adjustment function by the regulator of the existing first low-voltage power supply unit can be selectively used as necessary. There is an effect that can be done.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

The high voltage generator of this embodiment includes a first low voltage power supply section l;
It is composed of a high voltage generation section 2 and a second low voltage power supply section 6, of which the first low voltage power supply section l and the high voltage generation section 2 constitute the high voltage generation device explained in the section of the prior art. It is similar to what you do.

Like the first low-voltage power supply l, the second low-voltage power supply unit 6, when the low-voltage AC power supply voltage from the commercial power supply 3 is input to the input unit 61, is rectified by the subsequent rectifier circuit 62 and stabilized. The voltage is outputted as a DC voltage via the conversion circuit 63.

A command device 7 consisting of a microcomputer is connected to the second low voltage power supply section 6. This command device 7 can store in advance data on the output voltage value of the low-voltage power supply section 6, which is necessary for obtaining applied voltages suitable for various painting conditions, in accordance with the painting conditions. When a code number of a coating condition is input to the device 7, an output voltage value corresponding to the coating condition is sent out as a binary command signal. Then, the command signal is transmitted to the signal input section 6.
4, it is converted into a lO base number by a decoder 65 and then sent to a voltage detection circuit 66. The voltage value of the stabilization circuit 63 is compared with the voltage value fed back from the output side of the above-mentioned stabilization circuit 63. The output voltage value is controlled to match the command signal value.

Further, the output side of the stabilizing circuit 63 is connected to one of the input parts of the power supply switching circuit 67 which is switched by the external operation switch 672L shown in FIG. The connection line 8 drawn out from the output part of the power supply circuit I3 of the low voltage power supply part l of 1 is connected, and the output part of this power supply switching circuit 67 is connected to the inverter 2I of the high voltage generation part 2 already mentioned by the connection line 9. It is connected to the.

Therefore, if the second low voltage power supply section 6 side is connected to the high voltage generation section 2 by operating the switch 67a, low voltage DC voltage is supplied from the low voltage power supply section 6 to the high voltage generation section 2, and the command device 7 The output value of the DC voltage is controlled by the command signal, and the applied voltage output by the high voltage generator 2 is automatically adjusted to a value optimal for the coating conditions. On the other hand, switch 6
7a, the first low voltage power supply section l is connected to the high voltage generation section 2.
When connected to , low voltage DC voltage is supplied from the low voltage power supply section 1 to the high voltage generation section 2, and as before, the SLIDAC 1
By operating 4 and adjusting its output voltage value,
The applied voltage can be adjusted manually.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a schematic diagram showing the connection relationship thereof. 1: First low voltage power supply section 11. AC power input section 12: Rectifier circuit 13: Power supply circuit I4/Slidac 2: High voltage generation section 21: Inverter 22: Oscillator circuit 23: Boost circuit 3: Commercial power supply 5] 1 Paint gun 6 Second low voltage power supply section 61: AC Power input section 62/rectifier circuit 63
Stabilization circuit 64 Signal input section 65/Decoder 66
Voltage detection circuit 67/Power switching circuit 7: Command bag w
8.9: Connection line

Claims (1)

[Claims] A first low-voltage power supply unit that converts low-voltage AC power supply voltage into DC voltage and outputs it, and includes a regulator that manually adjusts the output value; and a first low-voltage power supply unit that converts low-voltage AC power supply voltage into DC voltage and outputs it. and a second low-voltage power supply unit equipped with a control circuit that controls the output value based on a command signal from an externally connected command device; , a high-voltage generation section that outputs a high-voltage DC voltage, and the output section of the second low-voltage power supply section and the output section of the first low-voltage power supply section are switched to the input section of the high-voltage generation section. High voltage generator for electrostatic painting, characterized by having a switching section for connection