The positive effect of the present invention is that: (1) external is amplified by the gear ratio of the gear components to form stronger pullout force;
本发明的积极效果是：（1）通过齿轮部件的齿轮比将外力放大从而形成强大的拉出力；
The positive effect of the present invention is that: (1) external is amplified by the gear ratio of the gear components to form stronger pullout force;
本发明的积极效果是：（1）通过齿轮部件的齿轮比将外力放大从而形成强大的拉出力；
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