Mobile object

1. A mobile object comprising:

a frame part having an internal space;

a wheel part coupled to a first side of the frame part and comprising a wheel;

movable modules coupled to a second side of the frame part and configured to be movable in a vertical direction relative to the frame part; and

a door module coupled to a first side of the movable modules, the door module being rotatable relative to the movable modules in a direction toward the internal space or a direction away from the internal space;

wherein each of the movable modules comprises:

a first coupling member fixedly coupled to the frame part;

a rail part slidably coupled to the first coupling member;

a second coupling member slidably coupled to the rail part; and

a movable belt member surrounding the rail part and having a first side coupled to the first coupling member and a second side coupled to the second coupling member.

2. The mobile object of claim 1 , wherein the first side and the second side of the movable belt member are fixedly coupled to the first coupling member and the second coupling member, respectively.

3. The mobile object of claim 1 , wherein the rail part comprises:

a first rail member disposed at a front side of the frame part and slidably coupled to the first coupling member; and

a second rail member disposed at a front side of the first rail member and slidably coupled to the second coupling member.

4. The mobile object of claim 3 , wherein each of the movable modules further comprises:

a first pulley disposed between the first rail member and the second rail member in a direction in which the movable belt member extends; and

a first power supply member configured to provide power for rotating the first pulley.

5. The mobile object of claim 4 , wherein the first pulley and the first power supply member are disposed in an upper region of the first rail member and the second rail member.

6. The mobile object of claim 3 , wherein the first rail member and the second rail member each extend in the vertical direction.

7. The mobile object of claim 1 , wherein the movable modules comprise a first movable module and a second movable module spaced apart from each other in a width direction, each having the movable belt member provided therein.

8. The mobile object of claim 7 , wherein the mobile object further comprises a power transmission shaft having a first side connected to the movable belt member provided in the first movable module, and a second side connected to the movable belt member provided in the second movable module.

9. The mobile object of claim 1 , wherein the frame part further comprises:

a conveying shaft rotatably provided; and

a conveying belt member configured to surround the conveying shaft and be rotated by a rotation of the conveying shaft.

10. The mobile object of claim 9 , wherein the first side and the second side of the movable belt member are fixedly coupled to the first coupling member and the second coupling member, respectively.

11. The mobile object of claim 9 , wherein the rail part comprises:

a first rail member disposed at a front side of the frame part and slidably coupled to the first coupling member; and

a second rail member disposed at a front side of the first rail member and slidably coupled to the second coupling member.

12. A mobile object comprising:

a frame part having an internal space;

a wheel part coupled to a first side of the frame part and comprising a wheel;

movable modules coupled to a second side of the frame part and configured to be movable relative to the frame part and movable in a vertical direction, wherein the movable module comprises:

a first coupling member fixedly coupled to the frame part;

a rail part slidably coupled to the first coupling member;

a second coupling member slidably coupled to the rail part; and

a movable belt member surrounding the rail part and having a first side coupled to the first coupling member and a second side coupled to the second coupling member; and

a door module coupled to a first side of the movable modules and configured to be rotatable in a direction toward the internal space or a direction away from the internal space, rotatable relative to the movable modules, and rotatable about its own axis, wherein the door module comprises:

two door frames spaced apart from each other in a width direction;

a first shaft disposed between the two door frames; and

a door belt member surrounding an outer portion of the first shaft and configured to be rotatable between the two door frames by a rotation of the first shaft.

13. The mobile object of claim 12 , wherein the door module further comprises a second shaft disposed between the two door frames, and the door frames are coupled to the second shaft and configured to be rotatable about the second shaft.

14. The mobile object of claim 13 , wherein the first shaft and the second shaft are disposed on the same axis.

15. The mobile object of claim 13 , wherein the door module further comprises a bearing member disposed between the first shaft and the second shaft and having a first side in contact with the first shaft and a second side in contact with the second shaft.

16. A method of operating a mobile object that includes a plurality of movable modules located within an internal space of the mobile object, the method comprising:

moving the mobile object to a delivery location;

moving a first movable module of the plurality of movable modules to a lower portion of the internal space;

rotating a door module of the mobile object away from the internal space about a door module axis adjacent the lower portion of the internal space;

moving an article in the first movable module onto a surface of the door module; and

lowering the door module toward a floor surface;

wherein each of the movable modules comprises:

a first coupling member fixedly coupled to a frame part of the mobile object;

a rail part slidably coupled to the first coupling member;

a second coupling member slidably coupled to the rail part; and

a movable belt member surrounding the rail part and having a first side coupled to the first coupling member and a second side coupled to the second coupling member.

17. The method of claim 16 , further comprising moving the article from the surface of the door module to the floor surface.

18. The method of claim 17 , further comprising:

raising the door module toward the internal space;

rotating the door module toward the internal space about the door module axis; and

moving the mobile object away from the delivery location.

19. The method of claim 16 , wherein the article in the first movable module is moved onto the surface of the door module using a conveyor belt.

20. The method of claim 16 , wherein the mobile object comprises:

a frame part defining the internal space;

a wheel part coupled to a first side of the frame part and comprising a wheel, the mobile object being moved to the delivery location using the wheel;

the movable modules, which are coupled to a second side of the frame part and configured to be movable in a vertical direction relative to the frame part; and

the door module, which is coupled to a first side of the movable modules.