| 摘要 |
PROBLEM TO BE SOLVED: To uniformly coat an uneven socket inner surface of a cast iron pipe, in a pipe inner surface coating device for spraying paint on a cast iron pipe inner surface.SOLUTION: A notch groove 16b extending in a radial shape from the periphery of its top part 16a, is provided in a plurality on an outer surface of a head part 16 formed in a dome shape as a spray nozzle 10 for injecting the paint mixed with air, and even an inner surface of an uneven socket 13 of the cast iron pipe 11 can be uniformly coated without omission of coating and coating nonuniformity within a range of a proper coating film thickness by obtaining a spray pattern expanding over a wide range in the axial direction and the circumferential direction of the cast iron pipe 11 by expanding the paint injected from respective injection ports 16c of this spray nozzle 10 along the notch grooves 16b, by providing the injection ports 16c of the paint on a bottom surface of these respective notch grooves 16b. |
