Self-locking fixing device and antenna assembly

1. A self-locking fixing device, comprising:

an inner mandrel arranged to include a nail head and a nail rod extending away from the nail head; and

a bushing arranged to include a nail head bushing and a nail rod bushing extending away from the nail head bushing, a sidewall of the nail head bushing being provided with at least two elastic clamping units, each elastic clamping unit is provided with a clamping portion on an inner surface of the corresponding elastic clamping unit, the clamping portions of the at least two elastic clamping units extending inwardly from the sidewall of the nail head bushing;

wherein, if the inner mandrel is assembled with the bushing, the nail head is located in the nail head bushing, the nail rod is located in the nail rod bushing, and the clamping portions of the at least two elastic clamping units are engaged with an upper surface of the nail head to clamp the nail head in the nail head bushing.

2. The self-locking fixing device of claim 1 , wherein a bottom of the nail rod bushing is arranged to include at least two elastic segments formed through cutting, and wherein if the inner mandrel is assembled with the bushing, the bottom of the nail rod forces the at least two elastic segments to spread out, and a relative clamping distance is formed between the at least two elastic segments which are spread out and the nail head bushing.

3. The self-locking fixing device of claim 2 , wherein outer surfaces of the at least two elastic segments are smooth outer convex curved surfaces.

4. The self-locking fixing device of claim 2 , wherein if the inner mandrel is assembled with the bushing, in a direction extending from the nail head along the nail rod, the bottom of the nail rod does not go beyond the at least two elastic segments which are spread out.

5. The self-locking fixing device of claim 1 , wherein a bottom of the nail rod is arranged as an outer convex curved surface.

6. The self-locking fixing device of claim 1 , wherein the nail head includes:

an upper surface;

a lower surface opposite to the upper surface; and

at least one side surface arranged between the upper surface and the lower surface,

wherein an area of the upper surface is larger than or equal to that of the lower surface.

7. The self-locking fixing device of claim 6 , wherein a first side surface, a second side surface and a third side surface are arranged between the upper surface and the lower surface, the first side surface adjoins the upper surface and forms a first chamfer angle, the second side surface adjoins the lower surface and forms a second chamfer angle, and the first chamfer angle is smaller than the second chamfer angle.

8. The self-locking fixing device of claim 1 , wherein a distance between lower ends of the clamping portions of the at least two elastic clamping units and a bottom of the nail head bushing differs from a thickness of the nail head by 0.1 mm to 0.2 mm.

9. The self-locking fixing device of claim 1 , wherein the sidewall of the nail head bushing is provided with three elastic clamping units.

10. The self-locking fixing device of claim 1 , wherein the clamping portions of the at least two elastic clamping units are disposed at an upper end of the corresponding elastic clamping unit.

11. The self-locking fixing device of claim 1 , wherein at least one side surface of the nail head and inner surfaces of the clamping portions of the at least two elastic clamping units are shaped to facilitate assembling the inner mandrel with the bushing.

12. The self-locking fixing device of claim 1 , wherein, when the clamping portions of the at least two elastic clamping units are engaged with the upper surface of the nail head, lower ends of the clamping portions engage the upper surface of the nail head and clamp the nail head into the nail head bushing.

13. An antenna assembly, comprising:

an oscillator provided with a first fixing hole thereon; and

an insulating plate provided with a second fixing hole thereon corresponding to the first fixing hole on the oscillator,

wherein the oscillator and the insulating plate are fixedly coupled by a self-locking fixing device, comprising:

an inner mandrel arranged to include a nail head and a nail rod extending away from the nail head; and

a bushing arranged to include a nail head bushing and a nail rod bushing extending away from the nail head bushing, a sidewall of the nail head bushing being provided with at least two elastic clamping units, each elastic clamping unit is provided with a clamping portion on an inner surface of the corresponding elastic clamping unit, the clamping portions of the at least two elastic clamping units extending inwardly from the sidewall of the nail head bushing;

wherein, if the inner mandrel is assembled with the bushing, the nail head is located in the nail head bushing, the nail rod is located in the nail rod bushing, and the clamping portions of the at least two elastic clamping units are engaged with an upper surface of the nail head to clamp the nail head in the nail head bushing.

14. The antenna assembly of claim 13 , wherein a distance between lower ends of the clamping portions of the at least two elastic clamping units and a bottom of the nail head bushing differs from a thickness of the nail head by 0.1 mm to 0.2 mm.

15. The antenna assembly of claim 13 , wherein the clamping portions of the at least two elastic clamping units are disposed at an upper end of the corresponding elastic clamping unit.

16. The antenna assembly of claim 13 , wherein at least one side surface of the nail head and inner surfaces of the clamping portions of the at least two elastic clamping units are shaped to facilitate assembling the inner mandrel with the bushing.

17. The antenna assembly of claim 13 , wherein, when the clamping portions of the at least two elastic clamping units are engaged with the upper surface of the nail head, lower ends of the clamping portions engage the upper surface of the nail head and clamp the nail head into the nail head bushing.