介绍了一种实用的内侧槽抽芯机构，可利用螺旋形弹簧钢板的顶出变形实现内侧抽芯，并阐述了抽芯机构的工作过程和关键技术。
A practical mechanism for the core-pulling of inside groove was presented. The core-pulling was achieved by applying the deformation of helical spring steel sheet during the ejecting process.
正常的双螺旋DNA是螺旋形的，像一根松松地卷曲的弹簧。
Normal, double-helix DNA is spiral , like a loosely coiled spring.
一条卷起来的弹簧形成一个螺旋形。
一条卷起来的弹簧形成一个螺旋形。
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