Patent ID: 6776361
Filing Date: 2004-08-17
Classification: B05B,B30B

Abstract:
A powdered material spraying device, comprising:a powdered material storage hopper for storing a powdered material, said storage hopper having a material discharge port and a material feed port, said material feed port bearing an airtight, detachable cover; a quantitative spraying device provided for said material discharge port of said powdered material storage hopper via a material feed valve; said quantitative spraying device comprising (A) a cylindrical body with openings at the top and the end respectively, said cylindrical body being airtightly connected with said material discharge port of said powdered material storage hopper, (B) an elastic membrane with a penetrating aperture provided so as to form a bottom of said cylindrical body at its lower opening end, and (C) a dispersion chamber connected under said lower opening end of said cylindrical body via said elastic membrane, said dispersion chamber comprising (i) a pulsating vibration air supply port for supplying a positive pulsating vibration air to said dispersion chamber, and (ii) a discharge port connected with a conduit for pneumatically transporting powdered material to a desired place by means of the positive pulsating vibration air, said powdered material being discharged into said dispersion chamber via said penetrating aperture when said elastic membrane is vibrated up and down by the positive pulsating vibration air supplied in said dispersion chamber from said pulsating vibration air supply port and being dispersed by the positive pulsating vibration air supplied in said dispersion chamber; and a bypass pipe connected between said cylindrical body and said dispersion chamber through which air moves freely between said cylindrical body and said dispersion chamber during spraying operation, so as to equalize air pressure between said cylindrical body and said dispersion chamber, wherein said pulsating vibration air supply port is provided at a lower part of said dispersion chamber in a substantially tangential direction against an internal circumference of said dispersion chamber; said discharge port being provided at an upper part of said dispersion chamber in a substantially tangential direction against the internal circumference of said dispersion chamber.