Crane device, driving method thereof, and stocker including same

1 . A crane device, comprising:

a first crane robot; and

a second crane robot, the first crane robot and the second crane robot being installed in a same space that exists directly between two consecutive stocking units having shelves,

wherein the first crane robot comprises:

a first column configured to be movable in a first direction and extend in a second direction;

a first arm unit configured to be movable along the first column; and

a first drive unit installed in an upper part of the first column and configured to move the first column in the first direction, the first drive unit at the upper part of the first column being a sole drive unit of the first column, and

the second crane robot comprises:

a second column configured to be movable in the first direction and extend in the second direction and spaced apart from the first column;

a second arm unit configured to be movable along the second column; and

a second drive unit installed in a lower part of the second column and configured to move the second column in the first direction, the second drive unit at the lower part of the second column being the sole drive unit of the second column,

wherein, when the first column and the second column are disposed in parallel in a third direction perpendicular to the first and second directions, the first arm unit at least partially overlaps with the second arm unit in the second direction.

2 . The crane device of claim 1 , further comprising: a first upper guide unit installed in the upper part of the first column and configured to guide a movement direction of the first column.

3 . The crane device of claim 1 , further comprising:

a first support block installed in the upper part of the first column and protruding in the third direction perpendicular to the first and second directions, and

a second support block installed in the lower part of the second column and protruding in the third direction,

wherein the first drive unit is formed at the first support block, the second drive unit is formed at the second support block, and, when the first column and the second column are disposed in parallel in the third direction, the first support block and the second support block at least partially overlap each other.

4 . The crane device of claim 3 , wherein

the first drive unit includes a plurality of first drive rollers disposed at both sides of the first support block in the third direction,

the first upper guide unit includes a plurality of first upper guide rollers disposed at both sides of the first support block in the third direction, and

a distance between the first drive rollers disposed at both sides of the first support block exceeds a distance between the first upper guide rollers disposed at both sides of the first support block.

5 . The crane device of claim 3 , wherein

the first drive unit includes a first drive roller disposed on at least one side of the first support block,

the first upper guide unit includes a first upper guide roller disposed on the at least one side of the first support block,

a first drive rail extending in the first direction is installed in an upper part of a stocker, and

the first drive roller rotates by a driving force and moves along a driving surface of the first drive rail, and the first upper guide roller moves along a guide groove of the first drive rail.

6 . The crane device of claim 1 , further comprising a first lower guide unit installed in a lower part of the first column and configured to guide the movement direction of the first column.

7 . The crane device of claim 6 , wherein

an LM guide rail extending in the first direction is installed in a lower part of a stocker, and

the first lower guide unit includes an LM block movable along the LM guide rail.

8 . The crane device of claim 1 , further comprising:

a second lower guide unit configured to guide a movement direction of the second column,

a second support block installed in the lower part of the second column and protruding in the third direction,

wherein the second drive unit includes a second drive roller disposed on at least one side of the second support block, and

the second lower guide unit includes a second lower guide roller disposed on at least one side of the second support block.

9 . The crane device of claim 8 , wherein

a second drive rail extending in the first direction is installed in the lower part of a stocker,

the second drive roller rotates by a driving force and moves along a driving surface of the second drive rail,

the second guide roller moves along a guide groove of the second drive rail, and

the first drive rail at least partially overlaps with the second drive rail in the second direction.

10 . The crane device of claim 1 , further comprising: a second upper guide unit installed in an upper part of the second column and configured to guide the movement direction of the second column.

11 . The crane device of claim 1 , further comprising:

a belt member installed in the first column and extending and disposed in the second direction,

wherein the first arm unit is connected to the belt member and is movable along the second direction.

12 . A stocker, comprising:

a first stocking unit including a plurality of first shelves and extending in a first direction;

a second stocking unit spaced apart from the first stocking unit, including a plurality of second shelves and extending in the first direction; and

a first crane robot and a second crane robot both disposed within a same space existing directly between the first stocking unit and the second stocking unit,

wherein the first crane robot comprises:

a first column configured to be movable in the first direction and extend in a second direction;

a first arm unit configured to be movable along the first column;

a first support block installed on an upper part of the first column and protruding in a third direction perpendicular to the first direction and the second direction;

a first drive unit installed in the first support block and configured to move the first column in the first direction, the first drive unit at the upper part of the first column being a sole drive unit of the first column; and

a first lower guide unit installed in a lower part of the first column and configured to guide a movement direction of the first column, and

the second crane robot comprises:

a second column configured to be movable in the first direction and extend in the second direction and spaced apart from the first column;

a second arm unit configured to be movable along the second column;

a second support block installed in a lower part of the second column and protruding in the third direction;

a second drive unit installed in the second support block and configured to move the second column in the first direction, the second drive unit at the lower part of the second column being the sole drive unit of the second column; and

a second upper guide unit installed in an upper part of the second column and configured to guide a movement direction of the second column.

13 . The stocker of claim 12 , wherein

the first crane robot further includes a first upper guide unit installed in the first support block and configured to guide the movement direction of the first column,

the first drive unit includes a plurality of first drive rollers disposed at both sides of the first support block in the third direction,

the first upper guide unit includes a plurality of first upper guide rollers disposed at both sides of the first support block in the third direction, and

wherein a distance between the first drive rollers disposed at both sides of the first support block exceeds a distance between the first upper guide rollers disposed at both sides of the first support block.

14 . The stocker of claim 13 , wherein

a first drive rail extending in the first direction is installed on an upper part of the stocker,

the plurality of first drive rollers rotate by a driving force and move along a driving surface of the first drive rail, and

the plurality of first upper guide rollers move along a guide groove of the first drive rail.

15 . The stocker of claim 14 , wherein a second drive rail extending in the first direction and corresponding to the second drive unit is installed in the lower part of the stocker, and the first drive rail at least partially overlaps the second drive rail.

16 . The stocker of claim 12 , wherein

an LM guide rail extending in the first direction is installed in the lower part of a stocker, and

the first lower guide unit includes an LM block movable along the LM guide rail.

17 . The stocker of claim 12 , wherein the second stocking unit includes an inlet port configured to carry in a container and an outlet port configured to carry out the container.

18 . A driving method of a crane device, the method comprising:

providing a stocker comprising: a first stocking unit including a plurality of first shelves and extending in a first direction; a second stocking unit spaced apart from the first stocking unit and including a plurality of second shelves and extending in the first direction; and a first crane robot and a second crane robot both disposed within a same space existing directly between the first stocking unit and the second stocking unit, wherein the first crane robot comprises: a first column configured to be movable in the first direction; a first arm unit configured to be movable along the first column; and a first drive unit installed in an upper of the first column and configured to move the first column in the first direction, and the second crane robot comprises: a second column configured to be movable in the first direction; a second arm unit configured to be movable along the second column; and a second drive unit installed in a lower part of the second column and configured to move the second column in the first direction;

picking up a container in a first position of the second stocking unit by the first arm unit of the first crane robot;

allowing the first crane robot to intersect the second crane robot and move to a second position, wherein, at the time of intersecting the first crane robot and the second crane robot, the first arm unit and the second arm unit are disposed at different heights, but at least partially overlap with each other; and

putting down the container in the second position of the second stocking unit by the first arm unit of the first crane robot,

wherein the first drive unit at the upper part of the first column is a sole drive unit of the first column, and

wherein the second drive unit at the lower part of the second column is the sole drive unit of the second column.

19 . The driving method of a crane device of claim 18 , further comprising: after the first arm unit picks up the container from the first position, checking the height of the first arm unit and the height of the second arm unit and confirming the probability of collision between the first arm unit and the second arm unit.

20 . The driving method of a crane device of claim 19 , further comprising: when a probability of collision is determined to appear as a result of confirming the probability of collision, moving the first arm unit at a height different from that of the second arm unit.