1. The familiar structures of loose core and ejector of hydrocylinder in injection mold were introduced.The calculating method of selecting hydrocylinder and the key points in using it were discussed.
   介绍了液压油缸在注塑模具中常见的抽芯及顶出结构,并对选取油缸的计算方法和使用要点进行阐述。
2. Except the use of time relay to control the pressure maintaining and cooling, the rest all takes a route switch to control the ordinal operation and speed changes for each hydrocylinder.
   本系统除ㄋ采用时间继电器控制保压和冷却动作外，其余都采用行程开关控制各油缸依次动作和进行速度换接。

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