| 摘要 |
PROBLEM TO BE SOLVED: To realize uniform construction of a wet type spraying apparatus that performs blowing construction on a wall surface of a molten metal container and the like with improved noise operation property and with reduced material loss and variations of the same. SOLUTION: An internal diameter of a castable pressure feed hose 13 located just near a spraying nozzle 11 of a castable wet type spraying apparatus 10 and an inlet internal diameter of the spraying nozzle are formed into a cylindrical configuration with a fine diameter of 35 to 45 mm for bringing the weight of the spraying nozzle section to light weight. Further, a throwing tube 14 for an additive is connected at an inclination angle of 30 to 90 degree with respect to the spraying nozzle 11, an outlet diameter of a throttle section 15 at the tip end of the spraying nozzle 11 is set 22 to 32 mm, and the length of the throwing tube 14 for an additive from the connection of the tube to the outlet of the blowing nozzle 11 is set 100 to 600 mm. The amounts of the additive and the amount of compression air for pressure feed of the castable are set 1.0 to 4.0 m3/minute inn the case of a liquid additive and 2.0 to 5.0 m3/minute in the case of powder additive, both variably, and air pressure is supplied with an air source of 0.2 to 0.55 Mpa.
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