Air spray device for heterogeneous mixture coating solution, using pulse opening and closing operations of needle valve

An air spray device for heterogeneous mixture coating solution, using pulse opening and closing operations of needle valve, the air spray device comprising:

• a main body provided with a heterogeneous mixture coating solution inlet and a compressed air inlet from outside;
• an extension block engaged with a lower end of the main body in a form extending downwards;
• a nozzle assembly engaged with a lower end of the extension block and formed with a discharge hole of coating solution for discharging the heterogeneous mixture coating solution passing the extension block to outside;
• a communication path formed vertically at the center of the main body, the extension block, and the nozzle assembly;
• a needle valve that is installed in the communication path, receiving rising and falling force from the main body, and performing pulse opening and closing operations for opening and closing the discharge hole for coating solution;
• and
• a plunger formed in a planar form, inserted to the needle valve so as to be disposed close to a floor side of the communication path of the extension block, performing pulse opening and closing operations with the needle valve, and generating fluid resistance in the communication path, so as to stir the heterogeneous mixture coating solution.