Coating material supply device and coating machine

A coating machine comprising:

• a coating material supply device capable of cleaning at least a coating material supply channel by pumping a cleaning liquid and cleaning air into the coating material supply channel, the coating material supply device comprising:
• the coating material supply channel, wherein the coating material supply channel is configured to receive a coating material supplied through the coating material supply device;
• a manifold comprising a first valve, a second valve, and a third valve;
• a cleaning tank for storing the cleaning liquid;
• a cleaning liquid supply unit for supplying the cleaning liquid from the cleaning tank to the coating material supply channel through the first valve and the third valve along a first flow path;
• a bubble generator for generating fine bubbles comprising at least one of microbubbles and nanobubbles in the cleaning liquid, wherein the bubble generator is along the first flow path between the cleaning tank and the first valve;
• an air supply unit for supplying the cleaning air to the coating material supply channel through the second valve and the third valve along a second flow path;
• and
• a cleaning control unit for controlling driving of the cleaning liquid supply unit and driving of the air supply unit,
• wherein during cleaning, the cleaning control unit controls to alternately drive the cleaning liquid supply unit while opening the first valve and closing the second valve and the air supply unit while opening the second valve and closing the first valve to alternately supply the cleaning liquid containing the fine bubbles and the cleaning air to the coating material supply channel;
• and
• a coating section having an ejection surface arranged with a plurality of nozzles in a predetermined arrangement pattern, and coating the object to be coated by ejecting coating material supplied by the coating material supply device from each of the plurality of nozzles.