该实用新型的特点是：活动的内层箱箱板通过链片和销轴与外层箱铰接成双层箱。
The utility model is characterized in that the box board of a movable inner layer box is hinged with an outer layer box to form a double-layer box through a chain piece and a pin shaft.
活动叶片上设有轴销，轴销上装有弹簧。
A shaft pin is arranged on the movable vanes, and a spring is arranged on the shaft pin.
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