Rotatable data card

1. A rotatable data card, comprising a data card body, a USB connector and a rotating shaft assembly, wherein the rotating shaft assembly comprises a rotating shaft, a fixed fluted disk, and a rotating shaft casing, the rotating shaft and the fixed fluted disk are accommodated in the rotating shaft casing, teeth are set on the rotating shaft and the fixed fluted disk, and the rotating shaft and the fixed fluted disk are engaged with each other;

the USB connector comprises a bracket, wherein a hole is opened on the bracket, the rotating shaft casing is set in the hole, and the rotating shaft is fixedly connected to the data card body; and

the rotating shaft rotates relative to the fixed fluted disk, and an angle between the data card body and the USB connector is never 180 degrees.

2. The rotatable data card according to claim 1 , wherein the rotating shaft comprises a square rotary head, a rotatable fluted disk and a tail part; teeth are set on an end face of the rotatable fluted disk, the fixed fluted disk is further set with a round hole, the tail part is fixed on the end face which is with the teeth and is of the rotatable fluted disk, the square rotary head is fixed on another end face of the rotatable fluted disk, the tail part of the rotating shaft passes through the round hole of the fixed fluted disk, and the fixed fluted disk and the rotatable fluted disk of the rotating shaft are engaged with each other through a manner of coordination of the teeth.

3. The rotatable data card according to claim 1 , wherein the rotating shaft assembly further comprises an elastic component, the elastic component is located in the rotating shaft casing, and the tail part of the rotating shaft passes through the elastic component and coordinates with the fixed fluted disk to extrude the elastic component.

4. The rotatable data card according to claim 3 , wherein the elastic component is a spring.

5. The rotatable data card according to claim 1 , wherein a cavity is set within the rotating shaft casing, and a round hole is opened on a side of the rotating shaft casing.

6. The rotatable data card according to claim 5 , wherein the rotating shaft passes through the round hole.

7. The rotatable data card according to claim 1 , wherein n teeth are set on the rotating shaft and the fixed fluted disk, respectively, and angles between any two adjacent teeth are the same, wherein n is an odd number greater than or equal to 3.

8. The rotatable data card according to claim 7 , wherein the rotating shaft rotates relative to the fixed fluted disk by an angle of

2

⁢

π

n

.

9. A rotatable data card, comprising a data card body, a USB connector and a rotating shaft assembly, wherein the rotating shaft assembly comprises a rotating shaft, a fixed fluted disk and a rotating shaft casing, the rotating shaft and the fixed fluted disk are accommodated in the rotating shaft casing, teeth are set on the rotating shaft and the fixed fluted disk, and the rotating shaft and the fixed fluted disk are engaged with each other;

the USB connector comprises a bracket, wherein a hole is opened on the bracket, the rotating shaft is set in the hole, and the rotating shaft casing is set at the data card body; and

the rotating shaft rotates relative to the fixed fluted disk, and an angle between the data card body and the USB connector is never 180 degrees.