| 摘要 |
A screwing device includes a holder, an interaction unit and a screwing unit. The holder has a rotation axle. The interaction unit is connected to the rotation axle and has an interaction ring. The screwing unit has a plurality of screwing elements and interacts with the inner peripheral surface of the interaction ring. When the holder rotates along a screwing direction, the interaction ring also rotates along the same screwing direction and drives the screwing unit to rotate along the same screwing direction.
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