熔透之后穿孔的速度远远大于熔透之前的。
The perforating speed after fully penetrating is far higher than that of before fully penetrating.
底座封闭于槽孔,其顶面中央设有供掣动件及抗扭弹簧套设的凸轴,并设有供以热熔性固着剂固定钢珠的穿孔;
The center of the braking piece is provided with the through hole which is sheathed on the convex shaft and the top face is provided with an upright shifting piece.
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