Electrostatic coating plant
The electrostatic coating plant includes an abnormality detection unit that detects abnormalities of a bumper. The detection of the abnormalities can be based on the difference between the level of the high voltage outputted from a high voltage generator, and the voltage level obtained when the electrostatic coating machine, which is not spraying coating material, is placed at a measurement position opposite to and separated by a predetermined separation distance from multiple measurement points on the bumper, arranged at the coating position, and lines of electric force are formed to the bumper with a constant current level.
1 . An electrostatic coating plant comprising:
a support means for supporting an object to be coated at a coating position;
a grounding means connected to the object to be coated for grounding the object to be coated; and
an electrostatic coating machine,
wherein the electrostatic coating machine includes a voltage generator that outputs a voltage for forming lines of electric force to the object to be coated that has been grounded by the grounding means,
wherein the electrostatic coating machine is configured for application to a coating material, and
wherein the electrostatic coating machine is configured to coat the object to be coated, arranged at the coating position, by causing coating material, which has been electrostatically charged to a voltage, to fly along the lines of electric force,
wherein the electrostatic coating plant comprises:
an abnormality detection unit configured to detect abnormalities of the object to be coated based on a difference between a measured voltage and a saved voltage,
wherein the measured voltage is a level of the voltage outputted from the voltage generator,
wherein the saved voltage is a voltage level obtained when the electrostatic coating machine, which is not spraying coating material, is placed at a measurement position opposite to and separated by a predetermined separation distance from one or multiple measurement points on the object to be coated, arranged at the coating position,
wherein the abnormality detection unit is configured to detect whether the object to be coated is in a state suitable for electrostatic coating and is not in any abnormal state based on the difference between the measured voltage and the saved voltage,
wherein the abnormal state indicates an unexpected-change in separation distance between the object to be coated and the electrostatic coating machine, and
wherein an outflow current is maintained at a constant level between the abnormal state and the state suitable for electrostatic coating, despite changes in the measured voltage, to prevent the generation of sparks.
2 . The electrostatic coating plant of claim 1 , wherein the abnormal state includes positional deviation of the object to be coated.
3 . The electrostatic coating plant of claim 2 , wherein the abnormal state includes surface shape abnormality.
4 . The electrostatic coating plant of claim 3 , wherein the abnormal state includes poor grounding.
5 . The electrostatic coating plant of claim 1 , wherein the abnormal state includes surface shape abnormality.
6 . The electrostatic coating plant of claim 5 , wherein the abnormal state includes poor grounding.
7 . The electrostatic coating plant of claim 1 , wherein the saved voltage is from a saved voltage characteristic curve.
8 . The electrostatic coating plant of claim of claim 7 , wherein the saved voltage characteristic curve is generated by measuring the voltage from the voltage generator when the object is in a normal position.
9 . The electrostatic coating plant of claim 1 , where the abnormality detection unit does not use the outflow current to detect abnormalities.