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。
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。
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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