Shredding apparatus

Abstract

A shredding apparatus (1) is disclosed, comprising: a first wall (11), a second wall (12), and a third wall (13) that are part of the frame (2); a shredding rotor (3) that is provided with shredding teeth (4); a side access door (5) that is movable to access a shredding chamber (6); a fourth wall (14) that is rotatably carried by the side access door (5) and that can assume a shredding position (TP) when the side access door (5) is in the closed position (CP); a counter-blade (7) that is carried by the fourth wall (14) and is arranged to cooperate with the shredding teeth (4); a grate (8) for selecting the size of the shredded material; damping means (24, 25) that are interposed between the side access door (5) and the fourth wall (14); anchoring means (31, 32) to anchor the fourth wall (14) and the grate (8) together. The grate (8) is sized to strike the first wall (11) during operation. The grate (8) can be disengaged from the anchoring means (31, 32) to be supported by the first wall (11) and by supports (51, 52) fixed to opposite walls (12, 13) of the frame.

Description

[0001] The present invention pertains to the technical field of shredding apparatuses.

[0002] A known shredding apparatus is disclosed in US2009 / 0121058 A1, in which: it comprises a frame; it comprises a shredding rotor that is rotatably carried by the frame and is equipped with a plurality of shredding teeth; it comprises a first wall that is part of the frame, faces the shredding rotor, and extends parallel to the axis of the shredding rotor; it comprises a second wall that is part of the frame and is adjacent to the first wall; it comprises a third wall that is part of the frame, is adjacent to the first wall, and is opposite the second wall; it comprises first movement means that are carried by the frame; it comprises a side access door that can be operated by the first movement means to assume a closed position, in which the side access door is opposite the first wall, and an open position, in which access to a shredding chamber where the shredding rotor is located is possible; it comprises a fourth wall that is rotatably carried by the side access door and can assume a shredding position when the side access door is in the closed position; it comprises second movement means to move the fourth wall; the fourth wall, at least when in the shredding position, the first wall, the second wall, and the third wall delimit the shredding chamber; it comprises a counter-blade that is carried by the fourth wall and is arranged to cooperate with the shredding teeth of the plurality of shredding teeth, thus shredding the material that is released into the shredding chamber when the side access door is in the closed position and the fourth wall is in the shredding position; it comprises a grate to select the size of the shredded material, which can be positioned below the shredding rotor.

[0003] However, this known shredding apparatus has some drawbacks.

[0004] If a non-shreddable body enters the shredding chamber, the shredding rotor and / or the counter-blade may become damaged, requiring replacement of the damaged parts and thus causing a prolonged interruption of the shredding apparatus's operation.

[0005] The dimensions of the side access door, the fourth wall, and the grate are constrained by the necessary kinematics: the side access door must be able to reach the open position to allow an operator to access the shredding chamber; the grate must have an adequate extension so that when the door is in the closed position, it is positioned below the shredding rotor, closing the shredding chamber; the grate must not interfere with the shredding rotor during the movement of the side access door.

[0006] In light of the above, the purpose of the present invention is to overcome these drawbacks.

[0007] This objective is achieved by means of a shredding apparatus in accordance with claim 1.

[0008] The damping means allow for the preservation of the integrity of the shredding teeth and the counter-blade: in fact, if a non-shreddable body is present, the fourth wall temporarily moves away from the shredding position, allowing the non-shreddable body to pass between the shredding teeth and the counter-blade. The non-shreddable body can thus complete a cycle within the shredding chamber, and when it encounters a shredding tooth (4) and the counter-blade again, the fourth wall can move away once more to let the non-shreddable body pass. In this way, the non-shreddable body may go through multiple cycles, giving an operator (or an automatic control system) time to notice the presence of the non-shreddable body and stop the shredding apparatus's operation so that the non-shreddable body can be subsequently removed from the shredding chamber.

[0009] From the above, it also follows that a shreddable body, before reaching a suitable size to pass through the grate, may complete one or more cycles within the shredding chamber.

[0010] The temporary displacement of the fourth wall from the shredding position causes a corresponding displacement of the grate, which, however, always remains in contact with the first wall: in this way, in any operating condition, the grate ensures the lower closure of the shredding chamber, so that all the material passes through it.

[0011] During the movement of the side access door, the grate is disengaged from the anchoring element and, therefore, from the fourth wall, being supported by the first support (51), the second support (52), and the first wall. This allows for greater flexibility in designing the dimensions of the side access door and the fourth wall.

[0012] Specific embodiments of the invention will be described below in accordance with the claims and with the aid of the attached drawings, in which: Figures 1A, 1B respectively show a side view and a perspective view of a shredding apparatus according to the present invention, when the corresponding side access door is in an open position and a grate has not yet been inserted from the outside; Figures 2A, 2B respectively show a cross-sectional view and a perspective view of the shredding apparatus of Figures 1A, 1B, when the side access door is in the open position and in a first phase of inserting a grate; Figures 3A, 3B respectively show a cross-sectional view and a perspective view of the shredding apparatus of Figures 1A, 1B, when the side access door is in the open position (OP) and in a second phase of inserting a grate; Figures 4A, 4B respectively show a cross-sectional view and a perspective view of the shredding apparatus of Figures 1A, 1B, when the side access door is in the open position and in a third phase of inserting a grate; Figures 5A, 5B respectively show a cross-sectional view and a perspective view of the shredding apparatus of Figures 1A, 1B, when the side access door is in the closed position and a fourth wall, which is rotatably carried by the side access door and which, in turn, carries an anchoring element for the grate and a counter-blade, is in a retracted position; Figures 6A, 6B respectively show a cross-sectional view and a perspective view of the shredding apparatus of Figures 1A, 1B, when the side access door is in the closed position and the fourth wall is in a position where the anchoring element has engaged the grate; Figures 7A, 7B respectively show a cross-sectional view and a perspective view of the shredding apparatus of Figures 1A, 1B, when the side access door is in the closed position and the fourth wall is in the shredding position, allowing the shredding of material through the cooperation of the shredding teeth of the shredding rotor and the counter-blade; Figures 8A, 8B respectively show a cross-sectional view and a perspective view of the shredding apparatus of Figures 1A, 1B, when the side access door is in the closed position and the fourth wall is temporarily in a retracted position, away from the shredding position, due to the presence of a non-shreddable body between a shredding tooth and the counter-blade; Figures 9, 10 respectively show an exploded view and an assembled view of the grate and of the anchoring element of the shredding apparatus of Figures 1A, 1B. Figure 11 shows a cross-sectional view of the grate and of the anchoring element of Figure 10; Figure 12 shows a perspective view of an alternative embodiment of the grate; Figure 13 shows an exploded view of an alternative embodiment of the grate and of the anchoring element.

[0013] With reference to the attached drawings, the shredding apparatus (1) comprises: a frame (2); a shredding rotor (3) that is rotatably carried by the frame (2) and is equipped with a plurality of shredding teeth (4); a first wall (11) that is part of the frame (2), faces the shredding rotor (3), and extends parallel to the axis of the shredding rotor (3); a second wall (12) that is part of the frame (2) and is adjacent to the first wall (11); a third wall (13) that is part of the frame (2), is adjacent to the first wall (11), and is opposite the second wall (12); first movement means (22) that are carried by the frame (2); a side access door (5) that can be operated by the first movement means (22) to assume a closed position (CP) (Figures 5A, 5B, 6A, 6B, 7A, 7B, 8A, 8B), in which the side access door (5) is opposite the first wall (11), and an open position (OP) (Figures 1A, 1B, 2A, 2B, 3A, 3B, 4A, 4B), in which access to a shredding chamber (6), where the shredding rotor (3) is located, is possible; a fourth wall (14) that is rotatably carried by the side access door (5) and can assume a shredding position (TP) (Figures 7A, 7B) when the side access door (5) is in the closed position (CP); second movement means (23) to move the fourth wall (14); the fourth wall (14), at least when in the shredding position (TP), the first wall (11), the second wall (12), and the third wall (13) delimit the shredding chamber (6); a counter-blade (7), which is carried by the fourth wall (14) and is arranged to cooperate with the shredding teeth (4) of the plurality of shredding teeth (4), thus shredding the material that is released into the shredding chamber (6) when the side access door (5) is in the closed position (CP) and the fourth wall (14) is in the shredding position (TP); a grate (8) to select the size of the shredded material, which can be positioned below the shredding rotor (3); damping means (24, 25) that are interposed between the side access door (5) and the fourth wall (14); the damping means (24, 25) are configured: to maintain the fourth wall (14) in the shredding position (TP) or to return the fourth wall (14) to the shredding position (TP) in contrast with the stresses generated on the same fourth wall (14) during the shredding of material in the shredding chamber (6); and to allow a departure of the fourth wall (14) from the shredding position (TP) within a limit value of the departure angle, during the shredding of material in the shredding chamber (6); anchoring means (31, 32) to anchor the fourth wall (14) and the grate (8) together; the grate (8) is sized to strike the first wall (11) when: the side access door (5) is in the closed position (CP); the fourth wall (14) is in the shredding position (TP) or is moved away from the shredding position (TP) within the said limit value of the departure angle; and the same grate (8) is anchored to the fourth wall (14) through the anchoring means (31, 32), so that the grate (8) is supported by the same fourth wall (14) through the anchoring means (31, 32) and by the first wall (11); the grate (8) includes a first striker element (41) and a second striker element (42); a first support (51), which can be fixed to the second wall (12) to receive the first striker element (41), and a second support (52), which can be fixed to the third wall (13) to receive the second striker element (42); the first support (51) and the second support (52) are arranged so that: when the side access door (5) is in the open position (OP), then the grate (8) can be supported by the first support (51), the second support (52), and the first wall (11); when the side access door (5) is in the closed position (CP), then the movement of the fourth wall (14) through the second movement means (23) can determine the disengagement of the grate (8) from the first support (51) and from the second support (52) and the anchoring of the grate (8) to the fourth wall (14) through the anchoring means (31, 32), or the disengagement of the grate (8) from the fourth wall (14) and the engagement of the grate (8) with the first support (51) and the second support (52).

[0014] Preferably, the first movement means (22) include at least one hydraulic cylinder, which is constrained on one side to the frame (2) and on the other side to the side access door (5). In particular, the first movement means (22) may include: a first hydraulic cylinder (not shown), which is constrained on one side to the frame (2) (for example, to the second wall (12)) and on the other side to a first side of the side access door (5); and a second hydraulic cylinder (22) (Figures 1A, 1B, 2B), which is constrained on one side to the frame (2) (for example, to the third wall (13)) and on the other side to a second side of the side access door (5), which is opposite the first side.

[0015] Preferably, the fourth wall (14) is rotatably coupled to the side access door (5). Preferably, the second movement means (23) include a third hydraulic cylinder (23) (Figures 5B, 6B, 7B, 8B), which is interposed between the side access door (5) and the fourth wall (14).

[0016] Preferably, the counter-blade (7) has a comb shape and includes a plurality of comb teeth to cooperate with the shredding teeth (4) of the plurality of shredding teeth (4).

[0017] The grate (8) may include a plurality of blades (17) arranged adjacent to each other and connected to each other to form a single body. Each blade (17) of the plurality of blades (17) may have a fang shape. The blades (17) of the plurality of blades (17) may be arranged parallel to each other.

[0018] In one embodiment shown in Figure 12, the grate (8) may include a perforated wall (18). The through-holes of the perforated wall (18) may have any shape suitable for selecting the size of the shredded material.

[0019] The damping means (24, 25) may comprise: a fourth hydraulic cylinder (24) (Figures 5B, 6B, 7B), which is interposed between the fourth wall (14) and the side access door (5); a fifth hydraulic cylinder (25), which is interposed between the fourth wall (14) and the side access door (5) and is spaced apart from the fourth hydraulic cylinder (24); and an accumulator (not shown in the drawings), which, for example, is carried by the side access door (5).

[0020] The accumulator may include an elastic membrane inside it, thus defining a first chamber that contains nitrogen at a certain pressure and a second chamber that is in fluid communication with the fourth hydraulic cylinder (24) and the fifth hydraulic cylinder (25).

[0021] If, during the operation of the shredding apparatus (1), a non-shreddable body is interposed between a shredding tooth (4) of the plurality of shredding teeth (4) and the counter-blade (7), the pressure generated in the second chamber of the accumulator may exceed a predetermined threshold value. Consequently, the second chamber of the accumulator expands by receiving oil from the fourth hydraulic cylinder (24) and the fifth hydraulic cylinder (25), while the first chamber of the accumulator contracts. In this way, the drop in pressure in the fourth hydraulic cylinder (24) and in the fifth hydraulic cylinder (25) causes the retraction of the fourth wall (14), which thus moves away from the shredding position (TP), allowing the non-shreddable body to pass between the mentioned shredding tooth (4) and the counter-blade (7). Once the pressure in the second chamber of the accumulator drops, the pressure in the first chamber of the accumulator prevails, and the oil contained in the second chamber is pumped back into the fourth hydraulic cylinder (24) and the fifth hydraulic cylinder (25), with the result that the fourth wall (14) returns to the shredding position (TP).

[0022] Alternatively, the damping means (24, 25) may comprise elastic means (solution not shown).

[0023] In the illustrated examples, the third hydraulic cylinder (23) is interposed between the fourth hydraulic cylinder (24) and the fifth hydraulic cylinder (25).

[0024] Preferably, the anchoring means (31, 32) comprise: a first anchoring element (31), which is fixed to the fourth wall (14) and, in turn, includes at least one hook (9); a second anchoring element (32), which is fixed to the grate (8) and, in turn, includes a hookable element (10) that can be hooked by the hook (9), allowing the grate (8) to rotate relative to the fourth wall (14).

[0025] The fourth wall (14) may be rotatably coupled to the side access door (5) at or near a first end of the fourth wall (14). The first anchoring element (31) may be fixed at or near a second end of the fourth wall (14), which is opposite the first end. Advantageously, in the event of a temporary movement of the fourth wall (14) away from the shredding position (TP) during the operation of the shredding apparatus (1) (Figures 7A, 7B), the grate (8) may rotate, even by a few degrees, relative to the fourth wall (14), which may prevent possible breakages of the first anchoring element (31) and / or the second anchoring element (32).

[0026] Preferably, the first anchoring element (31) comprises a plurality of hooks (9), which are arranged side by side along a direction parallel to the axis of the shredding rotor (3); the second anchoring element (32) comprises a plurality of hookable elements (10), each of which can be hooked by a hook (9) of the plurality of hooks (9), and which are arranged side by side along a direction parallel to the axis of the shredding rotor (3) when the grate (8) is anchored to the fourth wall (14) by the anchoring means (31, 32).

[0027] Preferably, the blades (17) of the plurality of blades (17) are connected to each other by the hookable elements (10) of the plurality of hookable elements (10), so that each hookable element (10) of the plurality of hookable elements (10) connects two adjacent blades (17) of the plurality of blades (17).

[0028] The hookable elements (10) of the plurality of hookable elements (10) are arranged at or near a first end of each blade (17) of the plurality of blades (17). Other fastening elements (15) for the blades (17) of the plurality of blades (17) may also be provided (see, for example, Figure 9), which are arranged at or near a second end of each blade (17) of the plurality of blades (17), which is opposite the first end.

[0029] The hookable elements (10) of the plurality of hookable elements (10) may each have a cylindrical shape and be fixed between two adjacent blades (17) of the plurality of blades (17).

[0030] Alternatively (solution shown in Figure 13), the plurality of hooks (9) may be part of the second anchoring element (32), while the plurality of hookable elements (10) may be part of the first anchoring element (31).

[0031] Preferably, the first striker element (41) protrudes from a first side of the grate (8), and the second striker element (42) protrudes from a second side of the grate (8), which is opposite the respective first side. See, for example, Figure 9.

[0032] The first striker element (41) may have a cylindrical shape. The second striker element (42) may have a cylindrical shape.

[0033] Preferably, the first support (51) comprises a first guide (61), which ends with a first stop (71) and is shaped to slidingly receive the first striker element (41), and the second support (52) comprises a second guide (62), which ends with a second stop (72) and is shaped to slidingly receive the second striker element (42).

[0034] The first support (51) may be removable from the second wall (12). The second support (52) may be removable from the third wall (13).

[0035] The shredding apparatus (1) comprises an outlet (16) for shredded material, which is arranged below the grate (8). A conveyor belt, not shown, may be positioned at the outlet (16).

[0036] The position of the first support (51) and the second support (52) on the second wall (12) and the third wall (13), respectively, can be adjusted between a forward position (Figures 1A to 6B) and a retracted position (Figures 7A, 7B, 8A, 8B).

[0037] The ability to retract the first support (51) and the second support (52) from the forward position can prevent the first support (51) and the second support (52) from interfering with the shredded material, which falls from the grate (8) at the outlet (16). Alternatively, the first support (51) and the second support (52) can be removed once the grate (8) is anchored to the fourth wall (14) by the anchoring means (31, 32).

[0038] The anchoring means (31, 32) may also comprise additional components to prevent the disengagement of the hookable elements (10) of the plurality of hookable elements (10) from the hooks (9) of the plurality of hooks (9) during the operation of the shredding apparatus (1), that is, during the shredding of material inside the shredding chamber (6) (Figures 7A, 7B, 8A, 8B).

[0039] To this end, and with reference to Figures 9-11, 13, the anchoring means (31, 32) may comprise: a plurality of recesses (81), made on a certain number of blades (17) (four according to the figures) of the plurality of blades (17) of the grate (8); a plurality of screws (82) (four according to the figures); a plurality of first through-holes (83), made on the first anchoring element (31) (four according to the figures); a plurality of locking elements (84) (four according to the figures), each of which is provided with a second through-hole (85) and an end suitable for engaging a recess (81) of the plurality of recesses (81); a plurality of locking nuts (86) (twelve according to the figures).

[0040] As is evident from the figures, each locking element (84) of the plurality of locking elements (84) is positioned so that its respective end fits into a recess (81) of the plurality of recesses (81). Then, each screw (82) of the plurality of screws (82) is inserted through a first through-hole (83) of the plurality of first through-holes (83) and through the second through-hole (85) of a locking element (84) of the plurality of locking elements (84). Finally, the locking nuts (86) of the plurality of locking nuts (86) secure each locking element (84) of the plurality of locking elements (84) in place.

[0041] A description follows of the possible operation of the shredding apparatus (1) according to the present invention, with particular reference to Figures 1-8.

[0042] Figures 1A, 1B show the shredding apparatus (1) when the side access door (5) is in the open position (OP) and the grate (8) has not yet been inserted from the outside. This may occur, for example, when the grate (8) is being replaced with another one to select a different size of shredded material. For example, compare the grate (8) illustrated in Figures 1-11, 13 with the one illustrated in Figure 12, which in this case is provided with a perforated wall (18).

[0043] Figures 2A, 2B show a first phase of inserting a grate (8) from above, with a vertical orientation. This may occur using known lifting means (not illustrated), by attaching the grate (8) with one or more chains (also not illustrated). As can be seen, the first support (51) and the second support (52) are both in a forward position.

[0044] Figures 3A, 3B show a second phase of inserting the grate (8), during which the grate (8) is oriented horizontally and comes into contact with the first wall (11).

[0045] Subsequently, the grate (8) is further tilted and positioned resting on the first support (51) and the second support (52). Specifically, the first striker element (41) and the second striker element (42) are positioned on the first guide (61) and the second guide (62), allowing the grate (8) to slide further towards the first wall (11) until the first striker element (41) and the second striker element (42) come into contact with the first stop (71) and the second stop (72), respectively, as illustrated in Figures 4A, 4B. At this point, the grate (8) is supported by the first support (51), the second support (52), and the first wall (11).

[0046] Subsequently, the side access door (5) is brought into the closed position (CP) using the first movement means (22) (first hydraulic cylinder and second hydraulic cylinder (22)), Figures 5A, 5B.

[0047] Then, the fourth wall (14) is actuated by the second movement means (23) (third hydraulic cylinder (23)) to rotate towards the shredding rotor (3), so that the grate (8) is anchored to the fourth wall (14) via the anchoring means (31, 32), resulting in the disengagement of the grate (8) from the first support (51) and the second support (52), see Figures 6A, 6B.

[0048] The movement of the fourth wall (14) continues until it reaches the shredding position (TP), Figures 7A, 7B.

[0049] At this point, the first support (51) and the second support (52) can be moved to the retracted position, and the shredding apparatus (1) can be operated to shred the material that is released from above.

[0050] Figures 8A, 8B finally show a temporary movement of the fourth wall (14) away from the shredding position (TP), which corresponds to a separation of the shredding teeth (4) of the plurality of shredding teeth (4) from the counter-blade (7). This may be caused by the presence of a non-shreddable body or a particularly "hard" shreddable body between a shredding tooth (4) and the counter-blade (7), which, however, can be shredded after one or more cycles around the shredding rotor (3), until it reaches a suitable size to pass through the grate (8) and reach the outlet (16). In this way, the body can pass between the shredding tooth (4) and the counter-blade (7), safeguarding the integrity of the shredding apparatus (1) as a whole.

[0051] If the grate (8) needs to be replaced, the first support (51) and the second support (52) should be moved to the forward position. Then, the fourth wall (14) should be retracted until the grate (8) disengages from the fourth wall (14) and rests on the first support (51) and the second support (52). At that point, the side access door (5) can be moved to the open position (OP) (since the grate (8) is stably supported by the first support (51), the second support (52), and the first wall (11)), and the grate (8) can be removed using the aforementioned lifting means (not illustrated) and replaced with another one, repeating the steps described above.

[0052] It is understood that the above description is provided by way of example and not limitation, so any structural variations are considered to fall within the scope of protection of the present technical solution, as claimed below.

Claims

1. Shredding apparatus (1), wherein: - it includes a frame (2); - it includes a shredding rotor (3) that is rotatably carried by the frame (2) and is equipped with a plurality of shredding teeth (4); - it includes a first wall (11) that is part of the frame (2), faces the shredding rotor (3), and extends parallel to the axis of the shredding rotor (3); - it includes a second wall (12) that is part of the frame (2) and is adjacent to the first wall (11); - it includes a third wall (13) that is part of the frame (2), is adjacent to the first wall (11), and is opposite the second wall (12); - it includes first movement means (22) that are carried by the frame (2); - it includes a side access door (5) that can be operated by the first movement means (22) to assume a closed position (CP), in which the side access door (5) is opposite the first wall (11), and an open position (OP), in which access to a shredding chamber (6) where the shredding rotor (3) is located is possible; - it includes a fourth wall (14) that is rotatably carried by the side access door (5) and can assume a shredding position (TP) when the side access door (5) is in the closed position (CP); - it includes second movement means (23) to move the fourth wall (14); - the fourth wall (14), at least when in the shredding position (TP), the first wall (11), the second wall (12), and the third wall (13) delimit the shredding chamber (6); - it includes a counter-blade (7) that is carried by the fourth wall (14) and is arranged to cooperate with the shredding teeth (4) of the plurality of shredding teeth (4), thus shredding the material that is released into the shredding chamber (6) when the side access door (5) is in the closed position (CP) and the fourth wall (14) is in the shredding position (TP); - it includes a grate (8) to select the size of the shredded material, which can be positioned below the shredding rotor (3); characterised in that: - it includes damping means (24, 25) that are interposed between the side access door (5) and the fourth wall (14); - the damping means (24, 25) are configured: to maintain the fourth wall (14) in the shredding position (TP) or to return the fourth wall (14) to the shredding position (TP) in contrast with the stresses generated on the same fourth wall (14) during the shredding of material in the shredding chamber (6); and to allow a departure of the fourth wall (14) from the shredding position (TP) within a limit value of departure angle, during the shredding of material in the shredding chamber (6); - it includes anchoring means (31, 32) to anchor the fourth wall (14) and the grate (8) together; - the grate (8) is sized to strike the first wall (11) when: the side access door (5) is in the closed position (CP); the fourth wall (14) is in the shredding position (TP) or is moved away from the shredding position (TP) within the said limit value of the departure angle; and the same grate (8) is anchored to the fourth wall (14) through the anchoring means (31, 32), so that the grate (8) is supported by the same fourth wall (14) through the anchoring means (31, 32) and by the first wall (11); - the grate (8) includes a first striker element (41) and a second striker element (42); - it includes a first support (51), which can be fixed to the second wall (12) to receive the first striker element (41), and a second support (52), which can be fixed to the third wall (13) to receive the second striker element (42); - the first support (51) and the second support (52) are arranged so that: when the side access door (5) is in the open position (OP) then the grate (8) can be supported by the first support (51), the second support (52), and the first wall (11); when the side access door (5) is in the closed position (CP) then the movement of the fourth wall (14) through the second movement means (23) can determine the disengagement of the grate (8) from the first support (51) and from the second support (52) and the anchoring of the grate (8) to the fourth wall (14) through the anchoring means (31, 32) or the disengagement of the grate (8) from the fourth wall (14) and the engagement of the grate (8) with the first support (51) and the second support (52).

2. Shredding apparatus (1) in accordance with the preceding claim, wherein the anchoring means (31, 32) comprise: - a first hooking element (31) that is fixed to the fourth wall (14) and in turn includes at least one hook (9); - a second hooking element (32) that is fixed to the grate (8) and in turn includes a hookable element (10) that can be hooked by the hook (9), allowing a rotation of the grate (8) with respect to the fourth wall (14).

3. Shredding apparatus (1) in accordance with the preceding claim, wherein: the first hooking element (31) includes a plurality of hooks (9) that are arranged side by side with respect to each other along a direction that is parallel to the axis of the shredding rotor (3); the second hooking element (32) includes a plurality of hookable elements (10) to be hooked each by a hook (9) of the plurality of hooks (9), and which are arranged side by side with respect to each other along a direction that is parallel to the axis of the shredding rotor (3) when the grate (8) is anchored to the fourth wall (14) through the anchoring means (31, 32).

4. Shredding apparatus (1) in accordance with the preceding claim, wherein the grate (8) includes a plurality of blades (17) adjacent to each other and connected to each other through the hookable elements (10) of the plurality of hookable elements (10), so that each hookable element (10) of the plurality of hookable elements (10) connects two adjacent blades (17) of the plurality of blades (17).

5. Shredding apparatus (1) in accordance with any one of the preceding claims, wherein the first striker element (41) protrudes from a first side of the grate (8) and wherein the second striker element (42) protrudes from a second side of the grate (8) that is opposite to the respective first side.

6. Shredding apparatus (1) in accordance with the preceding claim, wherein the first support (51) includes a first guide (61) that ends with a first stop (71) and is shaped to slidingly receive the first striker element (41), and wherein the second support (52) includes a second guide (62) that ends with a second stop (72) and is shaped to slidingly receive the second striker element (42).

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