METHOD FOR OPERATING A BIN STORAGE SYSTEM AND ROBOT VEHICLE

Abstract

A method of operating a bin storage system including a plurality of storage columns for the storage of a plurality of vertically-stacked storage bins, and a plurality of robot vehicles for transporting storage bins, the method includes: positioning a cavity of one of the plurality of robot vehicles such that it is aligned with one of the storage columns, receiving a storage bin from the storage column into the cavity, and moving the robot vehicle along the bin storage system, using a plurality of rolling members attached to the vehicle body about the cavity that are arranged for travelling in a first direction and a perpendicular second direction along the bin storage system.

Claims

1. A method of operating a bin storage system comprising a plurality of storage columns for the storage of a plurality of vertically-stacked storage bins, and a plurality of robot vehicles for transporting storage bins, the method comprises: positioning a cavity of one of the plurality of robot vehicles such that it is aligned with one of the storage columns, receiving a storage bin from the storage column into the cavity, and moving the robot vehicle along the bin storage system, using a plurality of rolling members attached to the vehicle body about the cavity that are arranged for travelling in a first direction and a perpendicular second direction along the bin storage system.

2. The method according to claim 1, wherein the step of receiving a storage bin from the storage column comprises the steps of: descending a lifting device of the robot vehicle into the storage column, engaging a storage bin with the lifting device, and lifting the lifting device of the robot vehicle with the storage bin from the storage column into the cavity.

3. The method according to claim 1, wherein the cavity is capable of receiving only one storage bin at any time.

4. The method according to claim 1, wherein the cavity is centrally arranged in the vehicle body.

5. The method according to claim 1, wherein the central cavity displays a downwardly facing opening for the storage bin.

6. The method according to claim 1, wherein at least a pair of rolling members are arranged symmetrically about the cavity.

7. A robot vehicle for transporting storage bins in a bin storage system, comprising: a) a vehicle body, b) a cavity arranged to receive a storage bin from a storage column, c) a plurality of rolling members arranged to allow the robot vehicle to travel in a first direction and a perpendicular second direction along an underlying vehicle support of the bin storage system, and d) means for reversibly and selectively displacing a first set of rolling members and a second set of rolling members away from the underlying vehicle support of the storage system during a change of vehicle direction between the first direction and the second direction.

8. The robot vehicle according to claim 7, wherein the cavity is centrally arranged in the robot vehicle.

9. The robot vehicle according to claim 7, wherein the central cavity displays a downwardly facing opening for the storage bin.

10. The robot vehicle according to claim 7, wherein at least a pair of rolling members are arranged symmetrically about the cavity.

11. The robot vehicle according to claim 7, wherein the bin storage system comprises: a) three-dimensional storage structure comprising a plurality of pillars which are positioned with internal distances and in a rectangular arrangement, wherein the rectangular arrangement of the pillars define the storage columns for the storage of a plurality of vertically-stacked storage bins, and b) supporting rails arranged in a two-dimensional matrix on the pillars, said supporting rails arranged in a first direction and a second direction orthogonal to the first direction, the supporting rails further defining openings for the storage columns.

12. The robot vehicle according to claim 11, wherein the plurality of rolling members of the vehicle body are arranged for travelling along a plurality of rolling tracks of the bin storage system, and the supporting rails define the rolling tracks.

13. A robot vehicle for transporting storage bins in a bin storage system, comprising: a) a vehicle body, b) a cavity arranged to receive a storage bin from a storage column, and c) a plurality of rolling members arranged to allow the robot vehicle to travel in a first and second direction along an underlying vehicle support of the bin storage system, wherein the vehicle body does not extend beyond the rolling members in at least one of the two travelling directions. d) means for reversibly and selectively displacing a first set of rolling members and a second set of rolling members away from the underlying vehicle support of the storage system during a change of vehicle direction between the first direction and the second direction.

14. The robot vehicle according to claim 13, wherein the vehicle body does not extend beyond any of the rolling members.

15. The robot vehicle according to claim 13, wherein the cavity wherein the cavity comprises a downwardly facing opening of essentially the same width and length as the openings for the storage columns.

16. The robot vehicle according to claim 13, wherein the vehicle body has a width and length such that a single robot vehicle essentially covers a single opening while retrieving a storage bin, whereby a second robot vehicle can traverse an adjacent column unhindered by the first robot.

17. A computer program product for a control unit in a bin storage system comprising: a plurality of storage columns for the storage of a plurality of vertically-stacked storage bins, and a plurality of robot vehicles for transporting storage bins, the computer program product comprises instructions that when executed on the control unit performs the method according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG. 1 is a perspective view of a prior art storage system;

[0021] FIG. 2 is a sectional view of a prior art robot or vehicle forming part of a storage system as illustrated in FIG. 1;

[0022] FIG. 3 is a perspective base view of a remotely operated vehicle according to the present invention;

[0023] FIG. 4 is a perspective top view of a remotely operated vehicle according to the present invention;

[0024] FIG. 5 is a perspective top view of a robot assembly comprising a remotely operated vehicle according to the present invention, a storage bin and a fully enclosing cover,

[0025] FIG. 6 is a perspective top view of a bin storing grid and a vehicle support in accordance with the present invention;

[0026] FIG. 7 is a perspective side view of a bin storing grid and a vehicle support in accordance with the present invention;

[0027] FIG. 8 is a perspective side view of part of a storage system in accordance with the present invention including a bin storing grid, a vehicle support and a remotely operated vehicle; and

[0028] FIG. 9 is a schematic top view of a remotely operated vehicle moving on a two dimensional matrix of supporting rails.

DETAILED DESCRIPTION

[0029] FIG. 1 is a schematic, partly cut perspective view of a storage system according to the prior art, and FIG. 2 is a sectional view of a corresponding prior art robot. Both figures have already been referred to earlier in the text.

[0030] FIGS. 3 and 4 gives a perspective view in two different angles of the inventive robot 1 comprising a rectangular vehicle body or framework 4 with a cavity 7 centrally arranged within the body 4, a top lid 72 covering the top part of the body 4, a first set of four wheels 10 mounted inside the cavity 7 and in parallel to the interior walls of the body 4 and a second set of four wheels 11 mounted in parallel to the exterior walls of the body 4. The first and second set of wheels 10,11 are oriented perpendicular to each other. Further, the vehicle body 4 also includes side parts 5,5a,5b arranged on both sides of the cavity 7 along at least one of the robots 1 direction of movements. For the sake of clarity a Cartesian coordinate system is shown with its X, Y and Z axes aligned along the principal directions of the rectangular vehicle body 4. The size of the cavity 7 is adapted to contain necessary component for a lifting device 9 and to at least completely contain the largest storage bin 2 intended to be picked up by the robot 1.

[0031] FIG. 5 gives a perspective view of a robot assembly where the body 4 is completely covered by an enclosing cover 73 comprising handles 74 and transmission means/control panel 75. The design of the enclosing cover 73 is adapted to the particular shape given by the body 4 and the protruding wheels 10. FIG. 5 also shows a small part of a storage bin 2 arranged fully inside the cavity 7 and a small part of the lifting device 9. The latter is preferably composed of inter alia four vertically moveable metal bands suspended on the cavity facing side of the top lid 72 in their upper ends and steering rods at the lower ends capable of being steered and fastened into adapted cavities/areas in the storage bin 2 to be picked.

[0032] The structural principles of a grid assembly comprising a bin storing structure or grid 15, integrated supporting rails 13 constituting the vehicle support 14 and a grid supporting base 76 are illustrated in FIGS. 6 and 7. The grid 15 comprises a plurality of pillars being arranged with internal distances adapted to accommodate storage bins 2 to be stored in stacks inside the grid 15. The rectangular arrangements of four adjacent pillars therefore constitute a storage column 8. Both the pillars and the rails 13 may be made of Aluminium. As for FIGS. 3 and 4 a Cartesian coordinate system is shown aligned along the principal directions of the grid assembly to ease the understanding. The supporting rails 13 form a two dimensional matrix of rectangular meshes, and the cross sectional area of most of these meshes coincide with the cross sectional area of each storage columns 8 set up by the underlying grid 15. The meshes at the border area 17,18 of the vehicle support 14 (at both sides in direction Y) is illustrated with cross sectional areas smaller than the remaining meshes. The size of the border meshes 17,18 should preferably be adapted to the degree of extension beyond a central storage column 8a situated immediately below the cavity 7 of the robot 1 when the latter is in a position for initiating pick up of a storage bin 2 contained in the central storage column 8a (see FIGS. 8 and 9). In this way the robot 1 may reach all the storage columns 8 in the storage system 3, i.e. independently of the robot orientation in the Y direction. For example, if the robot 1 extends exactly over the cross sectional area of one central storage column 8a in the X direction and over ½ of the cross sectional area of the adjacent storage column 8b in the Y direction, the cross sectional area of the meshes 17,18 at the border area in the Y direction should be approximately ½ of the cross sectional area of the remaining meshes. The primary function of these border meshes 17,18 is thus to allow sufficient space for the robot 1 having the novel design.

[0033] FIG. 8 shows the robot 1 in a lifting position above the central storage column 8a adjacent to the border area 17,18 of the grid assembly. The vehicle lifting device 9 is in this embodiment lowered a distance into the central storage column 8a in order to hook onto and lift up the underlying storage bin 2. As seen in the exemplary situation in FIG. 8 the robot 1, having the body 4 extended in the Y direction compared to the X direction, may be driven all the way to the edge of the grid 15 when the border area is designed with additional border meshes 17,18 with a Y directional width approximately ½ of the Y directional widths of the remaining meshes in the grid 15.

[0034] To better illustrate the movement of the robot 1 on the supporting rails 13 constituting the vehicle support 14 some exemplary positions of robots 1 on a grid assembly is illustrated in FIG. 9. The thick arrows drawn in the centre of the robots 1 indicate allowed moving directions. When the robot 1 is situated with its cavity 7 exactly above a central storage column 8a, as is the case for the top left and mid centred robot 1, the arrangement of the supporting rails 13 allow movement in both X and Y directions. Any other positions on the grid assembly restrict the robot's 1 movement on the vehicle support 14 either in X direction (lower right robot 1) or in Y direction (top centered and bottom left robot 1). To allow determination of the robot position it is considered advantageous to equip each robot 1 with one or more position sensors 16, for example optical sensors. Such sensors should 16 preferably be mounted in one or more areas of the robot 1 which ensures that the sensors 16 have both non-obstructed view to the underlying supporting rails 13 and that they pass directly above or close to the positions on the vehicle support 14 in which the rails 13 are crossing. The readings from the sensors 16 may inter alia dictate the further movement of the robot 1 and/or the operation of the vehicle lifting device 9.

[0035] All operations of the robot 1 are controlled by wireless communication means 75 and remote control units. This includes control of the robot movement, the vehicle lifting device and the position measurements.

[0036] In the preceding description, various aspects of the apparatus according to the invention have been described with reference to the illustrative embodiment. For purposes of explanation, specific numbers, systems and configurations were set forth in order to provide a thorough understanding of the apparatus and its workings. However, this description is not intended to be construed in a limiting sense. Various modifications and variations of the illustrative embodiment, as well as other embodiments of the apparatus, which are apparent to persons skilled in the art to which the disclosed subject matter pertains, are deemed to lie within the scope of the present invention.

LIST OF REFERENCE NUMERALS/LETTERS

[0037] 1 Remotely operated vehicle/robot [0038] 2 Storage bin [0039] 3 Storage system [0040] 4 Vehicle body/framework [0041] 5 First section (of vehicle body)/component section/side parts [0042] 5a First section, left [0043] 5b First section, right [0044] 6 Vehicle driving means/motor unit [0045] 7 Vehicle storage space/second part/cavity/centrally arranged cavity [0046] 8 Storage column [0047] 8a Central storage column [0048] 8b Adjacent storage column [0049] 9 Vehicle lifting device [0050] 10 First set of vehicle rolling means/First set of wheels [0051] 11 Second set of vehicle rolling means/Second set of wheels [0052] 12 Bin receiving opening [0053] 13 Supporting rail [0054] 14 Vehicle support [0055] 15 Bin storing structure/grid [0056] 16 Position sensing means/position sensor [0057] 17 Left outer lateral border area of vehicle support/left border mesh [0058] 18 Right outer lateral border area of vehicle support/right border mesh [0059] 50 Bin lift device [0060] 60 Delivery station/port [0061] 70 Yoke/overhang [0062] 72 Top lid [0063] 73 Enclosing cover [0064] 74 Handles [0065] 75 Transmission means/control panel/wireless communication means [0066] 76 Grid supporting base