Shredder device for foodstuffs

1. A shredder device for foodstuffs, comprising: a feed hopper, a screw conveyor running at least in sections through the feed hopper, and a shredder module following the screw conveyor in an axial direction (x), wherein the screw conveyor comprises a screw conveyor shaft driven by a screw conveyor motor unit and having a screw conveyor flight integrally formed thereon in sections, and the shredder module comprises a cutting drum having cutting openings formed therein, and a main screw rotatably arranged in the shredder module having a main screw shaft, which is driven by a main screw motor unit, and a main screw flight, which is formed thereon and passes over the cutting openings, wherein the main screw shaft is coaxially enclosed by the screw conveyor shaft inside the feed hopper up to the shredder module, and wherein only the main screw shaft of the main screw is enclosed by the screw conveyor shaft.

2. The shredder device according to claim 1 , wherein the screw conveyor shaft is designed as a closed tubular body in the axial direction.

3. The shredder device according to claim 1 , wherein the screw conveyor motor unit and the main screw motor unit are arranged on a side of the screw conveyor facing away from the shredder module.

4. The shredder device according to claim 1 , wherein the feed hopper has a first and second passage opening on opposite sides through which the screw conveyor shaft and the main screw shaft are passed.

5. The shredder device according to claim 4 , wherein the shredder module is fastened on the front side around the second passage opening.

6. The shredder device according to claim 4 , wherein the screw conveyor shaft and the main screw shaft are mounted in a common bearing block.

7. The shredder device according to claim 6 , wherein within the axial direction (x) of the bearing block the screw conveyor shaft is rotatably supported by several first screw conveyor bearings with respect to the bearing block and the main screw shaft is rotatably supported by at least one first main screw bearing relative to the screw conveyor shaft.

8. The shredder device according to claim 7 , wherein the first screw conveyor bearings and the at least one first main screw bearing are designed as roller bearings.

9. The shredder device according to claim 6 , wherein at the bearing block the screw conveyor shaft has a screw conveyor disconnection point and the main screw shaft has a main screw disconnection point.

10. The shredder device according to claim 6 , wherein the bearing block is arranged on an outside of the feed hopper around the first passage opening.

11. The shredder device according to claim 4 , wherein a centering insert is inserted into the second passage opening, in which the screw conveyor shaft is rotatably supported by of a second screw conveyor bearing and the main screw shaft is rotatably supported by a second main screw bearing.

12. The shredder device according to claim 11 , wherein the second screw conveyor bearing and the second main screw bearing are designed as slide bearings.

13. The shredder device according to claim 4 , wherein the shredder module comprises a pre-shredding drum which is arranged in the axial direction (x) between the cutting drum and the second passage opening.

14. The shredder device according to claim 13 , wherein lands and grooves are formed on an inner side of the pre-shredding drum.

15. The shredder device according to claim 2 , wherein the screw conveyor shaft is designed as a closed tubular body in the axial direction, and wherein the screw conveyor motor unit and the main screw motor unit are arranged on a side of the screw conveyor facing away from the shredder module.

16. The shredder device according to claim 15 , wherein the feed hopper has a first and second passage opening on opposite sides through which the screw conveyor shaft and the main screw shaft are passed, wherein the shredder module is fastened on the front side around the second passage opening, and wherein the screw conveyor shaft and the main screw shaft are mounted in a common bearing block.

17. The shredder device according to claim 16 , wherein within the axial direction (x) of the bearing block the screw conveyor shaft is rotatably supported by several first screw conveyor bearings with respect to the bearing block and the main screw shaft is rotatably supported by at least one first main screw bearing relative to the screw conveyor shaft, wherein the first screw conveyor bearings and the at least one first main screw bearing are designed as roller bearings, and wherein at the bearing block the screw conveyor shaft has a screw conveyor disconnection point and the main screw shaft has a main screw disconnection point.

18. The shredder device according to claim 17 , wherein the bearing block is arranged on an outside of the feed hopper around the first passage opening, and wherein a centering insert is inserted into the second passage opening, in which the screw conveyor shaft is rotatably supported by a second screw conveyor bearing and the main screw shaft is rotatably supported by a second main screw bearing.

19. The shredder device according to claim 18 , wherein the second screw conveyor bearing and the second main screw bearing are designed as slide bearings, and wherein the shredder module comprises a pre-shredding drum which is arranged in the axial direction (x) between the cutting drum and the second passage opening.