| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a supply/exhaust valve structure for a die molding machine in which the compacting of valve bodies and the facilitation of piping are achieved, the reduction of the number of parts is achieved, and in which the phenomenon that sand is infiltrated into an exhaust flow passage and blowing or exhaust performance is reduced is prevented, and which has a long service life. Ž<P>SOLUTION: The inside of a common valve body 1 is provided with an air supply flow passage 10 and an exhaust flow passage 20 so as to be freely openable/closable with valve bodies 31, 32. Further, a large amount of pressurized air is blown into the cavity in a short time, and further, for performing slow exhaust, the minimum cross-sectional area of the exhaust flow passage upon opening is set to 1/20 times to 1/1 time the minimum cross-sectional area of the supply flow passage upon opening. Further, the valve body is provided with an exhaust flow rate regulation means where the valve body moving speeds when the valve bodies 31, 32 opening and closing the exhaust flow passage are changed from a close state to an open state are differentiated, and regulation is performed in such a manner that the moving speed of the valve bodies is made low directly after the change of the open state and is gradually increased. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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