Device for sorting

1. A device for sorting, comprising:

a plurality of helical rollers, each roller exhibiting at least one helix, wherein each helical roller is rotatable about a rotary axis of its own, at least two adjacent helical rollers are rotatable in a same direction of rotation, and the rotary axes of at least three helical rollers are not arranged in a common plane, and the plurality of helical rollers together form a sorting surface that is curved at least in a partial region thereof so that a force generated by weight of a sorting material to be sorted with the device for sorting is exerted onto the sorting material in said curved partial region;

wherein all of the helical rollers are held and rotatably mounted exclusively at one end; and

wherein the sorting surface formed by the plurality of helical rollers is pivotable about a pivot axis that is arranged in a plane which is perpendicular to the rotary axes.

2. The device for sorting according to claim 1 , wherein the rotary axes of the helical rollers are orientated parallel to each other.

3. The device for sorting according to claim 1 , wherein the sorting surface formed by the helical rollers forms a depression or part of a depression.

4. The device for sorting according to claim 1 , wherein at least two helical rollers exhibit different directions of rotation.

5. The device for sorting according to claim 1 , wherein:

a. two or more of the helical rollers in a first partial region of the sorting surface exhibit the same first direction of rotation, and two or more of the helical rollers in a second partial region of the sorting surface which is different from the first partial region exhibit a direction of rotation which is opposite to the first direction of rotation; and

b. mutually adjacent helical rollers in the first partial region of the sorting surface exhibit the same first direction of rotation, and mutually adjacent helical rollers in the second partial region of the sorting surface which is different from the first partial region exhibit a direction of rotation which is opposite to the first direction of rotation.

6. The device for sorting according to claim 5 , wherein a center of the sorting surface or a lowest point on a depression of the sorting surface formed by the helical rollers is arranged between the first partial region and the second partial region.

7. The device for sorting according to claim 1 , wherein:

a. the helices of the helical rollers in a first partial region of the sorting surface exhibit a different coiling direction to the helices of the helical rollers in a second partial region of the sorting surface which is different from the first partial region, or

b. the helices of mutually adjacent helical rollers in a first partial region of the sorting surface of the device exhibit a different coiling direction to the helices of mutually adjacent helical rollers in a second partial region of the sorting surface which is different from the first partial region.

8. The device according to claim 7 , wherein the helices of mutually adjacent helical rollers interlock at least in a partial region, or the helices of mutually adjacent helical rollers of the partial regions of the sorting surface each interlock in the same direction of rotation, or the helices of all mutually adjacent helical rollers interlock.

9. The device according to claim 1 wherein:

a. a direction for introducing material to be sorted is defined which is orientated parallel to the rotary axis of at least one helical roller, or

b. a direction for introducing material to be sorted is defined which is orientated perpendicular to the rotary axis of at least one helical roller.

10. The device according to claim 1 wherein:

a. when in operation, the device simultaneously produces at least two fractions from material sorted by the device which are spatially separate from each other, or

b. when in operation, the device simultaneously produces at least two fractions from material sorted by the device which are spatially separate from each other and simultaneously expels them.

11. The device according to claim 1 , wherein the helical rollers that are held and rotatably mounted at one end comprise a core tube on which an outer tube casing is rotatably mounted which bears the helix.

12. The device according to claim 11 , wherein the core tube extends over only some of the length of the tube casing.

13. The device according to claim 12 , wherein at least one mount between the core tube and the tube casing is arranged in a region of a drive for the helical roller.

14. A construction machine, comprising a device for sorting according to claim 1 .

15. A digger's scoop, comprising:

a device for sorting that has a plurality of helical rollers, each roller exhibiting at least one helix, wherein each helical roller is rotatable about a rotary axis of its own, at least two adjacent helical rollers are rotatable in a same direction of rotation, and the rotary axes of at least three helical rollers are not arranged in a common plane, and wherein all of the helical rollers are held and rotatably mounted exclusively at one end, with the opposite ends of the helical rollers not held or mounted;

said device defining a filling opening for receiving material to be sorted; and

said device further defining a lateral opening which is different from the filling opening and is located in a side wall of the scoop adjacent to and in front of said opposite ends of the helical rollers not held or mounted for expelling material sorted by the device that has an oversize grain size from the opposite ends of the helical rollers, wherein material sorted by the device of a finer grain size is expelled between the rollers.

16. The digger's scoop according to claim 15 , further comprising a drive device for rotating the helical rollers.