ROTOR FOR A WASTE GRINDING APPARATUS AND WASTE GRINDING APPARATUS INCORPORATING SAID ROTOR

Abstract

A waste grinding apparatus (101) including a rotor having a central body (13) defining at least one radial vane (15a, 15b), provided, at its end (17a,17b) distal relative to a rotation axis (“S”) of the rotor (11), with a hammerhead (19) in which a first, knocker impact surface (21) adapted to operate when the rotor (11) rotates in a first, clockwise or counter-clockwise direction, and a second, wedge-shaped impact surface (23) adapted to operate when the rotor (11) rotates in a second direction opposite to the first direction, are defined.

Claims

1: A waste grinding apparatus (101), comprising a rotor (11) having a central body (13) defining at least one radial vane (15a,15b), provided, at its end (17a, 17b) distal relative to a rotation axis (“S”) of the rotor (11), with a hammerhead (19) in which a first, knocker impact surface (21) adapted to operate when the rotor (11) rotates in a first, clockwise or counter-clockwise direction, and a second, wedge-shaped impact surface (23) adapted to operate when the rotor (11) rotates in a second direction opposite to the first direction, are defined.

2: The waste grinding apparatus (101) according to claim 1, wherein the first, knocker impact surface (21) extends on a single plane (21a) parallel to the rotation axis of the rotor or substantially perpendicular to the angular direction of rotation of the rotor.

3: The waste grinding apparatus (101) according to claim 2, wherein the second, wedge-shaped impact surface (23) extends on a pair of planes (23a, 23b) inclined relative to a plane of rotation of the rotor (11) as well as inclined relative to each other.

4: The waste grinding apparatus (101) according to claim 3, wherein said pair of planes (23a, 23b) on which the second impact surface (23) extends are inclined at an angle (α1, α2) between 15° and 90° relative to the plane of rotation of the rotor (11).

5: The waste grinding apparatus (101) according to claim 4, wherein said pair of planes (23a, 23b) on which the second impact surface (23) extends are inclined at an angle (α1, α2) of 30° relative to the plane of rotation of the rotor (11).

6: The waste grinding apparatus (101) according to claim 5, wherein said pair of planes (23a, 23b) on which the second impact surface (23) extends are inclined at an angle (β) between 90° and 180° relative to each other.

7: The waste grinding apparatus (101) according to claim 6, further comprising a grinding cell (101a) in which the rotor (11) is housed.

8: The waste grinding apparatus (101) according to claim 7, wherein the rotor (11) is driven by an electric motor (25) controlled by an electronic unit (27) programmed for causing the rotor (11) to carry out a first working cycle, in which the rotor (11) rotates in the first direction, either clockwise or counter-clockwise, and a second working cycle, in which the rotor (11) rotates in the second direction opposite to the first direction.

9: The waste grinding apparatus (101) according to claim 8, wherein the first working cycle is carried out with the knocker impact surface (21) of the hammerhead (19) of the at least one vane (15a, 15b) of the rotor (11), and wherein the second working cycle is carried out with the wedge-shaped surface (23) of said hammerhead (19).

10: The waste grinding apparatus (101) according to claim 8, wherein the electronic unit (27) is programmed for keeping rotational speed of the electric motor (25) constant during the first working cycle, and for maintaining torque exerted by the electric motor (25) constant during the second working cycle.

11: The waste grinding apparatus (101) according to claim 1, wherein the second, wedge-shaped impact surface (23) extends on a pair of planes (23a, 23b) inclined relative to a plane of rotation of the rotor (11) as well as inclined relative to each other.

12: The waste grinding apparatus (101) according to claim 11, wherein said pair of planes (23a, 23b) on which the second impact surface (23) extends are inclined at an angle (α1, α2) between 15° and 90° relative to the plane of rotation of the rotor (11).

13: The waste grinding apparatus (101) according to claim 12, wherein said pair of planes (23a, 23b) on which the second impact surface (23) extends are inclined at an angle (α1, α2) of 30° relative to the plane of rotation of the rotor (11).

14: The waste grinding apparatus (101) according to claim 12, wherein said pair of planes (23a, 23b) on which the second impact surface (23) extends are inclined at an angle (β) between 90° and 180° relative to each other.

15: The waste grinding apparatus (101) according to claim 11, wherein said pair of planes (23a, 23b) on which the second impact surface (23) extends are inclined at an angle (β) between 90° and 180° relative to each other.

16: The waste grinding apparatus (101) according to claim 1, further comprising a grinding cell (101a) in which a rotor (11) is housed.

17: The waste grinding apparatus (101) according to claim 16, wherein the rotor (11) is driven by an electric motor (25) controlled by an electronic unit (27) programmed for causing the rotor (11) to carry out a first working cycle, in which the rotor (11) rotates, either clockwise or counter-clockwise, and a second working cycle, in which the rotor (11) rotates in an opposite direction.

18: The waste grinding apparatus (101) according to claim 17, wherein the first working cycle is carried out with the knocker impact surface (21) of the hammerhead (19) of the at least one vane (15a, 15b) of the rotor (11), and wherein the second working cycle is carried out with the wedge-shaped surface (23) of said hammerhead (19).

19: The waste grinding apparatus (101) according to claim 18, wherein the electronic unit (27) is programmed for keeping rotational speed of the electric motor (25) constant during the first working cycle, and for maintaining torque exerted by the electric motor (25) constant during the second working cycle.

20: The waste grinding apparatus (101) according to claim 17, wherein the electronic unit (27) is programmed for keeping rotational speed of the electric motor (25) constant during the first working cycle, and for maintaining torque exerted by the electric motor (25) constant during the second working cycle.

Description

SYNTHETIC DESCRIPTION OF THE FIGURES

[0017] Some preferred embodiments of the invention will be described below by way of non-limiting example with reference to the accompanying figures in which:

[0018] FIG. 1 is a simplified schematic view of a grinding apparatus incorporating a rotor made according to a preferred embodiment of the invention;

[0019] FIG. 2 is an enlarged view of a detail of FIG. 1.

[0020] The same references were used in all the figures to distinguish equal or functionally equivalent components.

DESCRIPTION OF SOME PREFERRED EMBODIMENTS OF THE INVENTION

[0021] Referring to FIG. 1, reference 11 is used to indicate the rotor according to the invention and reference 101 is used to indicate a waste grinding apparatus provided with a grinding cell 101a provided with an opening lid 101b at the top and with an unloading mouth 101c at the base. In the figure, the rotor 11 is shown seen from above inside the cell 101a of the grinding apparatus 101. The rotor 11 is preferably positioned near the lower base of the cell 101a, however, in other embodiments the rotor 11 may be positioned at different heights and multiple rotors 11 may be provided in the same grinding cell.

[0022] The rotor 11 comprises a central body 13 defining at least one radial vane 15a,15b provided, at its end 17a,17b distal relative to the rotation axis “S” of the rotor 11, with a hammerhead 19. In the example shown, a first, knocker impact surface 21, adapted to operate when the rotor rotates in a first, clockwise direction, and a second, wedge-shaped impact surface 23, adapted to operate when the rotor 11 rotates in a second direction opposite to the first, counter-clockwise in the example shown, are defined in the hammerhead 19.

[0023] The first, knocker impact surface 21 extends on a single plane 21a parallel to the rotation axis “S” of the rotor 11. Furthermore, in the example shown, the plane 21a on which the knocker impact surface 21 extends is substantially perpendicular to the angular direction of rotation of the rotor. More precisely, in the embodiment shown, said plane is furthermore tangent to an imaginary cylinder with its axis coinciding with the rotation axis “S” of the rotor 11 and contained in the rotor body, i.e., with the generatrices of said imaginary cylinder intercepting the body of the rotor.

[0024] The second, wedge-shaped impact surface 23 extends on a pair of planes 23a,23b inclined relative to the plane of rotation of the rotor 11 perpendicular to the rotation axis “S”. In addition, the planes 23a,23b are inclined relative to each other.

[0025] As can be better appreciated from FIG. 2, in the example shown, said two planes 23a,23b on which the second surface 23 extends are inclined at a corresponding angle α.sub.1, α.sub.2 between 15° and 90°, preferably about 30° with respect to the plane of rotation. Moreover, said two planes 23a,23b on which the second surface 23 extends are inclined at an angle β between 90° and 180° relative to each other.

[0026] Referring again to FIG. 1, the rotor 11 is driven by an electric motor 25 controlled by an electronic unit 27 programmed for allowing the rotor 11 to carry out a first working cycle, in which the rotor 11 rotates in a first direction, clockwise or counter-clockwise, and a second working cycle, in which the rotor 11 rotates in a second direction opposite to the first direction.

[0027] The first working cycle is carried out with the knocker impact surface 21 of the hammerhead 19 of the at least one vane 15a,15b of the rotor 11 and the second working cycle is carried out with the wedge-shaped surface 23 of said hammerhead 19.

[0028] The control unit 27 is preferably programmed for keeping the rotational speed of the electric motor 25 constant during the first working cycle, and for maintaining the torque exerted by the electric motor 25 constant during the second working cycle. The constant torque is preferably maintained by comparing the current absorbed by the electric motor with a predetermined threshold.

INDUSTRIAL APPLICABILITY

[0029] The rotor according to the invention is adapted to operate with a wide range of waste, from undifferentiated waste to separate recyclable materials and special waste of industrial or hospital origin.