DEVICE FOR BLOWING COMPRESSED AIR IN GREEN SAND MOLD MOLDING FACILITY

摘要

PROBLEM TO BE SOLVED: To provide a device which can blow a large quantity of compressed air into a molding flask filled with molding sand all at once while corresponding to various kinds of pattern plates having different shapes in the pattern parts. SOLUTION: A changeover valve 28 having three parts and two positions is peculiarly disposed between the inner part at the upper part of a cylinder 8 and a switch valve 19.