| 摘要 |
PROBLEM TO BE SOLVED: To provide the injection circuit for an injection molding machine which can secure safety during maintenance by preventing an erroneous operation by the residual pressure of the circuit. SOLUTION: In the injection circuit having a change-over valve 2 connected to the head side oil chamber and rod side oil chamber of an injection cylinder 1, on/off valves 4, 5 are installed respectively in pipe lines installed between the head side oil chamber and the servo change valve 2 and between the rod side oil chamber and the valve 2, and by releasing pressure oil between the head side oil chamber and the servo valve 2 and between the rod side oil chamber and the valve 2 to an oil tank at the end of each process, the unintended movement of an injection piston by the residual pressure is prevented.
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