Unmanned aerial vehicle

1. An unmanned aerial vehicle, comprising:

an airframe, comprising first mounting portions, wherein the first mounting portion comprises a first mounting body and connecting rods formed on the first mounting body, the connecting rods extending in a pitch axis direction; and

a power assembly, comprising a first assembling body and eccentric wheels mounted on the first assembling body, wherein the eccentric wheel is rotatable between a first rotation position and a second rotation position of the first assembling body around a rotation axis of the first assembling body, the rotation axis being perpendicular to the pitch axis direction, wherein

the connecting rod is insertable into the eccentric wheel in the pitch axis direction when the eccentric wheel is rotated to the first rotation position; and

the connecting rod is non-retractable from the eccentric wheel in the pitch axis direction when the eccentric wheel is rotated to the second rotation position and the connecting rod is inserted into the eccentric wheel;

a tail wing assembly, the tail wing assembly removably mounted to the airframe, and the tail wing assembly is rotatable around the pitch axis direction.

2. The unmanned aerial vehicle according to claim 1 , wherein the first mounting body comprises a first mounting surface, the connecting rods being formed on the first mounting surface;

the first assembling body comprises a first assembling surface and a first side surface that are connected to each other, wherein the first assembling surface is configured to be attached to the first mounting surface and connecting holes are formed on the first assembling surface, the connecting holes being configured to be inserted by the connecting rods; and rotating holes are formed on the first side surface, the rotating holes comprising a rotation axis and being in communication with the connecting holes; and

the eccentric wheel is mounted in the rotating hole.

3. The unmanned aerial vehicle according to claim 2 , wherein the connecting rod comprises a rod body and a limiting body;

the rod body extends in the pitch axis direction, the limiting body is connected to an end of the rod body far away from the first mounting body and a cross-section size of the rod body is less than a cross-section size of the limiting body;

the eccentric wheel comprises a rotating wheel, wherein a cavity is formed in the rotating wheel and the rotating wheel comprises a cylindrical surface disposed around the rotation axis, the cylindrical surface being sleeved on a hole wall of the rotating hole; and an arc-shaped guide groove and an avoidance groove are formed on the cylindrical surface, the arc-shaped guide groove being in communication with the cavity and provided around the rotation axis, the arc-shaped guide groove comprising a first end and a second end, the avoidance groove being in communication with the cavity and the first end;

when the eccentric wheel is rotated to the first rotation position, the avoidance groove is aligned with the connecting hole and the limiting body is accommodatable in the cavity through the connecting hole in the pitch axis direction; and

when the eccentric wheel is rotated to the second rotation position and the limiting body is accommodated in the cavity, the second end is aligned with the connecting hole and the limiting body is non-retractable from the cavity through the arc-shaped guide groove in the pitch axis direction.

4. The unmanned aerial vehicle according to claim 3 , wherein the limiting body is spherical.

5. The unmanned aerial vehicle according to claim 3 , wherein the first assembling body further comprises a second side surface, the first side surface being opposite to the second side surface, the first assembling surface being connected between the first side surface and the second side surface; the rotating hole extends from the first side surface to the second side surface and an opening of the rotating hole on the second side surface is closed by a closure plate, the closure plate being detachably connected to the second side surface; and

the hole wall of the rotating hole comprises an annular stopper portion protruding close to the first side surface, the annular stopper portion being disposed around the rotation axis.

6. The unmanned aerial vehicle according to claim 5 , wherein the rotating wheel further comprises a first end surface and a second end surface opposite to each other, the cylindrical surface being connected between the first end surface and the second end surface, the first end surface abutting against the annular stopper portion and the second end surface abutting against the closure plate.

7. The unmanned aerial vehicle according to claim 6 , wherein the eccentric wheel further comprises a boss; and

the boss is formed in the center of the first end surface and is exposed from the rotating hole, a groove configured to be screwed by a screwdriver being formed on a surface of the boss facing away from the first end surface.

8. The unmanned aerial vehicle according to claim 7 , wherein an arc-shaped bump is formed on the annular stopper portion toward the first end surface;

the eccentric wheel further comprises an interference portion, the interference portion being formed on the boss in a direction perpendicular to the rotation axis;

the first end surface abuts against the annular stopper portion by using the arc-shaped bump;

the interference portion abuts against an end of the arc-shaped bump when the eccentric wheel is rotated to the first rotation position; and

the interference portion abuts against an other end of the arc-shaped bump when the eccentric wheel is rotated to the second rotation position.

9. The unmanned aerial vehicle according to claim 2 , wherein a positioning beam is further formed on the first mounting surface, the positioning beam extending in the pitch axis direction; and

a positioning hole is further formed on the first assembling surface, the positioning hole being configured to be inserted by the positioning beam.

10. The unmanned aerial vehicle according to claim 9 , wherein a cross-section of the positioning beam is non-circular.

11. The unmanned aerial vehicle according to claim 10 , wherein the cross-section of the positioning beam is square.

12. The unmanned aerial vehicle according to claim 2 , wherein a first plug-connection terminal is disposed on the first mounting surface; and

a second plug-connection terminal is disposed on the first assembling surface and is configured to be plug-connected to the first plug-connection terminal.

13. The unmanned aerial vehicle according to claim 1 , wherein the power assembly comprises a fixed-wing assembly and a rotor assembly;

the fixed-wing assembly and the rotor assembly are replaceable connected to the first mounting portion;

the airframe and the fixed-wing assembly jointly form a vertical take-off and landing fixed-wing unmanned aerial vehicle when the fixed-wing assembly is connected to the first mounting portion;

the airframe and the rotor assembly jointly form a multi-rotor unmanned aerial vehicle when the rotor assembly is connected to the first mounting portion; and

either of the fixed-wing assembly and the rotor assembly comprises the first assembling body and the eccentric wheels.