Air sealing mechanism for delivery of compressed air in a spraying device

A disk head of a spraying device for delivering compressed air to cause a liquid to be sprayed at a spray target, comprising:

• a disk tray to carry one or more liquid-containing pods, the disk tray including a center wall that defines a hollow center;
• a rotating platform to receive and rotate the disk tray horizontally around a vertical axis that extends through the hollow center of the disk tray;
• and
• an air supply assembly, wherein the air supply assembly comprises:
• a nozzle slider including a concave air output mouth from which the compressed air flows out in a forward direction toward the spray target, a backward-facing slanted surface, a groove at a bottom end of the backward-facing slanted surface, and an air tube to receive the compressed air;
• and
• a slider cover on top of the nozzle slider, a bottom surface of the slider cover including a peg extending downward, wherein
• when the slider cover is pushed down, the peg moves down the slanted surface into the groove and the nozzle slider moves in the forward direction to form an air-sealed contact with an inner side of the center wall of the disk tray and to deliver the compressed air through an air hole in the center wall to one of the liquid-containing pods, and
• when the slider cover moves back up, the peg moves up the slanted surface and the nozzle slider moves in a backward direction, and
• wherein the air supply assembly stays stationary when the rotating platform rotates.