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。
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.
为油缸设置的凹槽必须有排泄功能，以确保一旦出现油缸泄漏，它能将油放到模具外面。
All SVG cylinder pockets must have sufficient drainage to allow oil to flow out the bottom of the tool in the event of a hydraulic line leak.
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