Backstop null of hydraulic type injection molding

摘要

PURPOSE: To prevent a vice that high pressure hydraulic oil is scattered at the time of an exchange of screws or maintenance and further that a screw collides with an inner wall of a heating oylinder or hazard is generated on an operator. ;CONSTITUTION: One or at least two condition detecting parts 4, 5 detecting a condition of an accumulator 3 making hydraulic regeneration unnecessary, for example, the condition detecting part 4 detecting suspension of a pump motor 2m of a hydraulic pump 2, the condition detecting part 5 detecting a start of maintenance by a method wherein a safety cover of injection molding machine is removed and an automatic discharge control part 6 which allows to discharge hydraulic oil of an accumulator 3 to a drain circuit Cd when at least the one condition detecting part 4 or 5 detects the foregoing condition are provided.;COPYRIGHT: (C)1995,JPO