The fixed shaft is supported in the supporting rack by a spring.

固定轴通过弹簧支承在支架里边。

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The lower part of the supporting rack is provided with two movable legs connected with movable feet by springs and movable rotation shafts.

支架下部有两个活动腿，活动腿和活动脚均通过活动转轴和弹簧连接。

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The back part of the supporting rack is provided with a positioning bracket, and the positioning bracket is provided with a positioning screw bolt.

支撑架背部设有定位支架，定位支架上设有定位螺杆；

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