Robot for transporting storage bins

1. A bin storage system comprising a three-dimensional bin storage structure and a plurality of robot vehicles which are movable on top of the bin storage structure to retrieve storage bins from the bin storage structure,

wherein the bin storage structure comprises:

a plurality of pillars which are positioned with internal distances and in a rectangular arrangement adapted to accommodate the storage bins, wherein the rectangular arrangement of the pillars define storage columns for the storage bins;

supporting rails which are arranged in a two-dimensional matrix on top of the pillars and provide a vehicle support for the plurality of robot vehicles allowing each robot vehicle to travel across the bin storage structure in a first direction and in a second direction, which is orthogonal to the first direction;

a storage bin delivery station; and

a bin lift device which is arranged to receive storage bins from the plurality of robot vehicles and transport the storage bins in a vertical direction from a top level of the bin storage structure to the delivery station, and

wherein each of the robot vehicles comprises a vehicle body comprising:

a first set of rolling means for moving the robot vehicle along the supporting rails in the first direction;

a second set of rolling means for moving the robot vehicle along the supporting rails in the second direction;

a cavity for receiving a storage bin; and

a lifting device for retrieving a storage bin from a storage column and storing the storage bin in the cavity,

wherein the cavity is arranged centrally within the vehicle body.

2. The bin storage system according to claim 1 , wherein the vehicle body surrounds at least part of the cavity.

3. The bin storage system according to claim 2 , wherein the vehicle body comprises side parts arranged on both sides of the cavity along at least one of the robot vehicle's direction of movements.

4. The bin storage system according to claim 1 , wherein the robot vehicle comprises a top lid covering the top part of the vehicle body.

5. The bin storage system according to claim 1 , wherein the cavity comprises a downwardly facing opening for the storage bin.

6. The bin storage system according to claim 1 , wherein both sets of vehicle rolling means are arranged symmetrically around the cavity near the lower corners of the robot vehicle.

7. The bin storage system according to claim 1 , wherein said first and second sets of rolling means each comprises at least four wheels.

8. A method of operating a bin storage system comprising a three-dimensional bin storage structure and a plurality of robot vehicles which are movable on top of the bin storage structure to retrieve storage bins from the bin storage structure,

wherein the bin storage structure comprises:

a plurality of pillars which are positioned with internal distances and in a rectangular arrangement adapted to accommodate the storage bins, wherein the rectangular arrangement of the pillars define storage columns for the storage bins;

supporting rails which are arranged in a two-dimensional matrix on top of the pillars and provide a vehicle support for the plurality of robot vehicles allowing each robot vehicle to travel across the bin storage structure in a first direction and a second direction, which is orthogonal to the first direction;

a storage bin delivery station; and

a bin lift device which is arranged to transport the storage bins, in a vertical direction, from a top level of the bin storage structure to the delivery station; and

wherein each of the robot vehicles comprises a vehicle body comprising:

a first set of rolling means for moving the robot vehicle along the supporting rails in the first direction;

a second set of rolling means for moving the robot vehicle along the supporting rails in the second direction;

a cavity for receiving a storage bin, wherein the cavity is arranged centrally within the vehicle body;

a lifting device for retrieving a storage bin from a storage column and storing the storage bin in the central cavity; and

wherein the method comprises the steps of:

positioning one of the plurality of robot vehicles above one of said storage columns such that the central cavity of the vehicle body is aligned with the storage column;

using the lifting device of the vehicle body, retrieving a storage bin from the storage column and storing the storage bin inside the central cavity;

using the first and second sets of rolling means, moving the robot vehicle along the supporting rails to the bin lift device and transferring the storage bin to the bin lift device; and

using the bin lift device, conveying the storage bin down in a vertical direction from the top level of the bin storage structure to the delivery station.

9. The method according to claim 8 , wherein the vehicle body surrounds at least part of the central cavity.

10. The method according to claim 9 , wherein the vehicle body comprises side parts arranged on both sides of the cavity along at least one of the robot vehicle's direction of movements.

11. The method according to claim 8 , wherein the robot vehicle comprises a top lid covering the top part of the vehicle body.

12. The method according to claim 8 , wherein the central cavity displays a downwardly facing opening for the storage bin.

13. The method according to claim 8 , wherein both sets of vehicle rolling means are arranged symmetrically around the cavity near the lower corners of the robot vehicle.

14. The method according to claim 8 , wherein said first and second sets of rolling means each comprises at least four wheels.