SHREDDING DEVICE FOR A SHREDDING PLANT

1 . A shredding device comprising a drum having a central hub rotating around an axis on which a plurality of discoid elements are mounted adjacent, able to rotate solidly together and carrying peripherally beating elements, wherein each discoid element comprises a set of beating elements which comprises at least a pair of beating elements and wherein, along the axis, the beating elements of the pair of one discoid elements are disposed angularly staggered with respect to the beating elements of the pair of the discoid element(s) immediately adjacent to said one discoid element.

2 . The shredding device as in claim 1 , wherein the pairs of beating elements are disposed, relative to a predetermined angular position with respect to the axis, on relative discoid elements separated by one or more other discoid elements so as to determine an alternate development thereof.

3 . The shredding device as in claim 1 , wherein the beating elements of each discoid element are mounted in a diametrically opposite position, at 180°, with respect to the axis.

4 . The shredding device as in claim 1 , wherein each discoid element is divided into several angular sections, disposed around the axis, in which one of said beating elements is mounted on at least two of said angular sectors of each discoid element.

5 . The shredding device as in claim 4 , wherein the device provides groups of angular sectors associated with the same angular position with respect to the axis, each of which has, overall, a series of beating elements with a predefined and alternate cadence along the axis, which are mounted on discoid elements separated by one or more discoid elements.

6 . The shredding device as in claim 5 , wherein the sum of the beating elements for each group of angular sectors is greater than one and less than the number of the discoid elements.

7 . The shredding device as in claim 5 , wherein the angular sectors are each provided with a predetermined angular amplitude, in which the number of beating elements mounted overall on a number of groups of adjacent angular sectors and equal to half the groups of angular sectors is equal to the number of discoid elements.

8 . The shredding device as in claim 5 , wherein the angular sectors are each provided with an angular amplitude of 60°.

9 . The shredding device as in claim 5 , wherein there are eleven discoid elements.

10 . The shredding device as in claim 1 , wherein each beating element is peripherally pivoted, with a constraining end, to a relative discoid element by means of a pin, so that the beating elements are able to rotate independently from each other and from the drum, and are able to pass independently from a first position outside the drum, an operating position in which they are able to hit the scrap, to a second position comprised within the bulk of the drum, a non-operating position, and vice versa.

11 . The shredding device as in claim 10 , wherein the discoid elements are assembled with each other by means of central connection elements, so as to define, for each pair of discoid elements, a housing seating in which each beating element is comprised in the second position, in which each connection element has a plurality of surfaces, each of which faces towards a corresponding beating element, each surface having a curvilinear profile mating with a curvilinear profile present on a free end of each beating element, opposite the constraining end, so as to define, when the surface and the free end are facing in the second position, an interspace of constant size.

12 . The shredding device as in claim 11 , wherein the curvilinear profile of each surface of the connection element and the curvilinear profile of the free end of each beating element coincide with a predetermined arc of a circumference.

13 . The shredding device as in claim 10 , wherein each pin comprises a determinate portion around which one of the beating elements is rotatably mounted, which portion is made of a metal material with a greater hardness than that of the metal material of which the remaining part of the pin is made.

14 . The shredding device as in claim 1 , comprising protection elements disposed on the external lateral surface of the drum in a manner complementary to the beating elements, so as to cover substantially the whole of said lateral surface, leaving free relative windows for the passage of the beating elements.

15 . The shredding device as in claim 14 , wherein each of the protection elements has externally gripper and friction means.

16 . The shredding device as in claim 14 , wherein the protection elements each have a cross section having a seating facing towards the inside of the drum, able to accommodate part of the discoid element and a horizontal external wall, of variable length according to the surface of the drum to be protected, so as to define an overall section that can be U-shaped, T-shaped, symmetrical, or asymmetrical, or horizontal F-shaped.