Rotary paint atomizer system and method of monitoring a rotary paint atomizer

摘要

A method of monitoring a rotary paint atomizer includes determining a target rotational speed, a target air flow rate, a target torque, and a target electrostatic current; and measuring an operating rotational speed, an operating air flow rate, an operating torque, and an operating electrostatic current. The method includes detecting at least one of a first condition in which the operating rotational speed differs from the target rotational speed, a second condition in which the operating air flow rate differs from the target air flow rate, a third condition in which the operating torque differs from the target torque, and a fourth condition in which the operating electrostatic current differs from the target electrostatic current. After detecting, the method includes producing an indicator signal indicative of at least one of the first, second, third, and fourth condition. A rotary paint atomizer system is also disclosed.

主权项

1. A method of monitoring a rotary paint atomizer, wherein the rotary paint atomizer includes a bell cup rotatable about an axis, having an outer edge spaced apart from the axis, and configured for ejecting a coating composition from the outer edge towards a workpiece; an air turbine coupled to the bell cup and configured for rotating the bell cup about the axis at an operating rotational speed; a shroud surrounding the bell cup and configured for ejecting a shaping air adjacent to the outer edge at an operating air flow rate; a flow meter configured for transmitting the shaping air to the shroud; a motor configured for generating an operating torque and transmitting the coating composition to the bell cup; a servo amplifier disposed in electrical communication with the motor; and an electrostatic cascade configured for generating an operating electrostatic current and electrically energizing the outer edge so that the coating composition is electrostatically attracted to the workpiece, the method comprising:
determining:
a target rotational speed of the bell cup about the axis;a target air flow rate of the shaping air ejectable from the shroud;a target torque generatable by the motor; anda target electrostatic current generatable by the electrostatic cascade; after determining, collecting:
a first analog command output value indicative of the operating rotational speed and generated by a first proportional-integral-derivative controller that is disposed in electrical communication with a first current-to-pressure transducer that is disposed in pneumatic communication with the air turbine to thereby measure the operating rotational speed;a second analog command output value indicative of the operating air flow rate and generated by the first proportional-integral-derivative controller that is disposed in electrical communication with a second current-to-pressure transducer that is disposed in pneumatic communication with the flow meter to thereby measure the operating air flow rate;a third analog command output value indicative of the operating torque and generated by the first proportional-integral-derivative controller that is disposed in electrical communication with the servo amplifier that is disposed in electrical communication with the motor to thereby measure the operating torque; anda fourth analog command output value indicative of the operating electrostatic current between the electrostatic cascade and the outer edge and generated by a second proportional-integral-derivative controller that is disposed in electrical communication with the electrostatic cascade to thereby measure the operating electrostatic current; after collecting, comparing:
the operating rotational speed and the target rotational speed;the operating air flow rate and the target air flow rate;the operating torque and the target torque; andthe operating electrostatic current and the target electrostatic current; concurrent to comparing, detecting at least one of:
a first condition in which the operating rotational speed differs from the target rotational speed;a second condition in which the operating air flow rate differs from the target air flow rate;a third condition in which the operating torque differs from the target torque; anda fourth condition in which the operating electrostatic current differs from the target electrostatic current; and after detecting, producing an indicator signal indicative of at least one of the first condition, the second condition, the third condition, and the fourth condition.