Rotary demolition machines for excavators and general work machines

Abstract

The present invention relates to a rotary demolition machine (100) for a work machine such as an excavator. The rotary demolition machine comprises a support structure (1), a single rotating drum (2) with a number of teeth (20) and a drive unit for the rotating drum. The support structure includes a connection plate (10) defining a connection plane with the work machine, the connection plate comprising lateral arms for rotatably supporting the rotating drum. The rotation axis (X) of the conical drum is inclined with respect to the connection plane such that the cone generatrix of the rotating drum is substantially parallel to the connection plane.

Description

[Technical field]

[0001] The present invention relates to a rotary disaggregator comprising a rotating member having a conical extension with a plurality of teeth extending therefrom. Such a rotary disaggregator is generally intended to be connected to the arm of an excavator or earthmoving machine. [Background technology]

[0002] Among the accessories applied to the arms of excavators and similar working machines, it is known to use milling devices, typically called milling heads or rotary demolition machines, formed by a pair of drums provided with a series of teeth.

[0003] Such equipment has the advantage of being versatile and efficient and is typically used in the field of infrastructure for the excavation of tunnels and, more generally, for road construction and rock crushing.

[0004] An example of this type of equipment is described in US Patent No. 6,626,500. Here, a rotary milling cutter is provided that comprises a frame supporting two rotating drums. These drums are mounted on the same shaft and rotated by a hydraulic motor that is actuated by a flow of oil supplied by the working machine itself. This equipment can be fixed to the arm of an excavator by a connecting attachment so that the operator can move and orient the milling cutter as desired in the required position. Other similar equipment are described in JP 2004-250931, Chinese Patent Application No. 105002884, and European Patent Application No. 2199468.

[0005] However, such rotary milling machines are not entirely suitable for working at depth, since they have dimensions such that when the milling cutter reaches a certain depth, the body of the milling cutter comes into contact with the ground, preventing the milling cutter from going beyond this depth, or at least preventing easy working therewith.

[0006] One example of a solution to this problem is the rotary milling cutter described in WO 2012045327 A1, where in addition to the two lateral drums a central element with teeth is also provided, which allows machining in the area of ​​the central part and at the same time prevents the milling cutter from digging beyond a certain depth.

[0007] However, this solution has further drawbacks, including a certain complexity of construction, low reliability of the central element, which is also used to transmit the movement to the two lateral drums, as well as handling of the milling cutter in general.

[0008] Furthermore, this solution is concentrated in the central part of the milling cutter, but parts of the body of the milling cutter may also impede the forward movement of the dismantling machine. Summary of the Invention [Problem to be solved by the invention]

[0009] The problem that the present invention aims to solve is therefore to provide a rotary dismantling machine that is configured to at least partially overcome one or more of the drawbacks mentioned above with reference to the prior art.

[0010] Another object of the present invention is to provide a rotary demolition machine that is particularly suitable for excavating at great depths.

[0011] Yet another object is to provide a rotary demolition machine which is particularly agile during excavation operations.

[0012] Another object of the present invention is to provide a rotary demolition machine which minimizes the risk that the structure supporting the rotating drum will impede the normal forward movement of the machine during excavation operations.

[0013] Yet another object is to improve known rotary dismantler machines, generally within the bounds of reasonable solutions and at relatively low cost. [Means for solving the problem]

[0014] The above problems are solved by a rotary demolition machine for a work machine, such as an excavator, comprising a support structure connectable to a movable arm of the work machine, a rotating drum having a plurality of teeth, and a drive unit configured to rotate the rotating drum about a rotation axis (X), thereby achieving at least in part one or more of the above-mentioned objects.

[0015] Preferably, the rotating drum has a frusto-conical shape.

[0016] Preferably, the support structure comprises a connection plate defining a connection plane with the work machine. In a preferred embodiment, the connection plate is configured to secure the rotary dismantler to the arm of the work machine such that the connection plane is substantially perpendicular to the arm of the work machine.

[0017] Preferably, the support structure comprises a support arm which rotatably supports the rotating drum.

[0018] Preferably, the axis of rotation is inclined with respect to the connection plane a such that the generatrix of the frusto-conical shape is substantially parallel to the connection plane.

[0019] It should be noted that by positioning the drum so that the generatrix of the cone is parallel to the plate, a particularly compact construction can be obtained, making it possible to effectively utilize the movement provided by the movable arm of the work machine.

[0020] Preferably the support arms are lateral, preferably having sides disposed axially opposite the rotating drum and defining an outer surface of the lateral arms.

[0021] In some embodiments, the end of the rotating drum is aligned with the side along a direction parallel to the generatrix of the cone, or alternatively protrudes relative to the side along that direction.

[0022] It should be noted that the arrangement of the rotating drum of the demolition machine of the present invention makes it possible to eliminate the presence of areas not covered by the movement of the teeth of the rotating drum, at least in the depth-wise advancement of the demolition machine.

[0023] In fact, the use of a conical shape and an inclined axis of rotation makes it possible to provide an end of the drum that covers the arm that supports the drum itself, which protrudes from it when a single drum is present, and brings the drums closer together when two adjacent drums are used.

[0024] Preferably, the rotating drum defines an opposite base surface along the axis of rotation to the end portion and is provided with a plurality of additional teeth.

[0025] In this way, the dismantling operation is also carried out in the area of ​​the base surface of the frustum cone which corresponds to the smaller base, which makes the operation of the dismantling machine in the area of ​​the end of the drum more effective.

[0026] This solution serves to reduce or limit the occurrence of blockages in the rotation of the drum, which may occur in the case of deep excavations as a result of contact between the base surface of the drum and the side walls of the excavation.

[0027] According to another aspect, the frusto-conical shape defined by the rotating drum has a conicity of an angle substantially equal to twice the inclination angle formed between the axis of rotation and the connecting plane.

[0028] In this way, the generatrix of the frusto-conical drum is arranged horizontally so as to have a simple structure that is particularly suitable for withstanding the stresses to which the demolition machine is subjected during civil engineering operations.

[0029] The inclination angle is preferably in the range of 10° to 30°, more preferably in the range of 15° to 25°, and even more preferably 20°.

[0030] The applicant has determined that such values ​​make it possible to optimize the dimensions of the dismantling machine's structure and to define a volume sufficient to accommodate the components intended for its movement when the drum is hollow.

[0031] In some embodiments, the outer surfaces of the lateral support arms extend substantially perpendicular to the connection plane.

[0032] Preferably, the connecting plate extends from an outer surface of the lateral support arm along the same direction as the rotating drum.

[0033] These features provide a more compact structure and further prevent the connecting plate from interfering with the operation of the rotary dismantler.

[0034] Preferably, the support structure comprises a pair of tapered connecting plates forming a pair of further side walls of the support structure, which extend from the support plate towards the support arms and taper in a direction away from the support plate.

[0035] In this way, a cantilever-like structure of the drum relative to the support arm can be used while still ensuring sufficient strength in the structure of the dismantling machine.

[0036] In some embodiments, the teeth define a rotational orbit having a diameter equal to or greater than the extent of the support plate in a direction perpendicular to the generatrix of the cone.

[0037] Preferably, the rotating drum defines a large diameter section and a small diameter section, whereby the teeth located in the area of ​​the small diameter section define a rotational path such that the teeth located in the area of ​​the small diameter section project relative to the connecting plate parallel to the cone generatrix.

[0038] Preferably, the teeth project relative to the connecting plate parallel to the cone generatrix along the direction of extension from the larger diameter part to the smaller diameter part, i.e. opposite the sides, if any.

[0039] It should be noted that, in fact, on the opposite side of the drum, i.e. the side furthest from the arm, the dismantling machine structure, including the support plate, may be covered by the teeth themselves, which may project outwardly from the frustoconical shape of the drum.

[0040] Preferably, the teeth arranged in the region of the large diameter of the rotating drum do not protrude towards the connecting plate parallel to the cone generatrix.

[0041] This feature allows maintaining a compact structure, since the part of the drum adjacent to the large diameter is located under the upper plate, while on the opposite side, i.e. in the region of the small diameter, the teeth protrude relative to the plate, without affecting the efficiency of the drilling.

[0042] According to another aspect, the drive unit comprises a hydraulic motor and a preferably planetary reduction gear. Preferably, the hydraulic motor has an axis of rotation that is inclined with respect to the axis of rotation of the rotating drum. Preferably, the reduction gear has an axis of rotation that coincides with the axis of rotation of the rotating drum.

[0043] In this way, the overall dimensions can be optimized, allowing the use of drive units of sufficient power while at the same time reducing the dimensions of the structure of the rotary dismantling machine according to the invention.

[0044] In some embodiments, the rotating drum is hollow and the reduction gear is received within a cavity defined by the rotating drum, this feature also contributing to optimizing the overall dimensions of the structure.

[0045] In some embodiments, the teeth comprise a coupling element connected to the outer shell of the drum defining its frustoconical shape, and a cutting element supported by the coupling element and intended to come into contact with the surface to be processed. Preferably, the coupling element is configured to support the cutting element so that it extends in a direction that is inclined with respect to a direction perpendicular to the outer shell. In a preferred embodiment, the cutting element has an inclination in the range of 20° to 70° with respect to a tangent direction of the outer shell in the region of the coupling element.

[0046] This angle is advantageous when used with a frusto-conical drum, particularly when the angle envisaged by the present invention is used, thus optimizing the angle at which the teeth actually impact the material being broken down.

[0047] In some embodiments, the plurality of additional teeth comprises a respective coupling element connected to the base surface of the drum and a respective cutting element supported by the respective coupling element and intended to contact the surface to be processed. Preferably, the coupling element is configured to support the cutting element to extend in a direction that is inclined with respect to a plane defined by the base surface. Preferably, the coupling element has an elongated form and the cutting element is aligned along the longitudinal direction of the coupling element. In a preferred embodiment, the coupling element has an inclination with respect to the plane in the range of 20° to 70°.

[0048] These characteristics of the teeth make it possible to optimise the demolition operation, obtaining a different action in the areas of the hull which are in contact parallel to the ground and in the areas of the base surface which are inclined to the sides of the excavation.

[0049] In some embodiments, the teeth arranged in the end region project in a direction X away from the support structure. Preferably, the teeth arranged adjacent the base surface project in a direction X away from the support structure.

[0050] Preferably, the teeth project outwardly from the rotating drum in the area of ​​the reduced diameter of the drum.

[0051] Each of the above features contributes to limiting the likelihood of contact between the support structure and the side walls of the excavation during operation of the demolition machine.

[0052] Preferred features of the invention are set out in the dependent claims. [Brief description of the drawings]

[0053] Other advantages, features and uses of the present invention will become more apparent from the following detailed description of a number of embodiments thereof, given by way of non-limiting example with reference to the accompanying drawings, in which: [Figure 1] FIG. 1 is a perspective view of a rotary dismantling machine according to the present invention. [Diagram 2] FIG. 2 is a front sectional view of the dismantling machine shown in FIG. [Diagram 3] FIG. 3 is a side view of the dismantling machine shown in FIG. 2. [Figure 4] FIG. 1 is a perspective view of a rotary dismantler according to the present invention with the rotating drum removed to show additional components. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0054] Referring initially to FIG. 1, a rotary dismantler constructed in accordance with the present invention is indicated generally by the reference numeral 100 .

[0055] The demolition machine 100 is of a type intended for use with a work machine such as an excavator (not shown).

[0056] According to one aspect of the invention, the demolition machine 100 is intended to be secured to a movable arm of an excavator, as will be described in more detail below.

[0057] 1, the dismantling machine comprises a support structure 1 which can be connected to a movable arm of a working machine. The connection is preferably made in the area of ​​a connection plate 10 which defines a connection plane a in which the connection with the corresponding part of the arm is advantageously made.

[0058] For example, for performing excavation operations and generally for performing the necessary machining operations, the connection plate may be provided with a number of holes into which corresponding screws engage for connection to a demolition machine that is movable by the arm of the excavator.

[0059] In a preferred embodiment, the connection plate 10 is configured to secure the rotary dismantler 100 to the arm of the work machine such that the connection plane a is substantially perpendicular to the arm of the work machine.

[0060] It should be noted that one skilled in the art would recognize the direction in which the excavator arm extends, which typically extends longitudinally, and thus would be able to define a corresponding plane perpendicular to that longitudinal extension.

[0061] As the example of FIG. 1 shows, the support structure 1 comprises a lateral arm 11 which rotatably supports a rotating drum 2 intended to perform a grinding operation.

[0062] Preferably the dismantler comprises a single rotating drum 2 cantilevered from a support arm 11 .

[0063] However, it should be noted that the present invention may also be applied when two rotating drums are arranged side by side.

[0064] Preferably, the drum 2 is provided with a number of teeth 20 which act on the ground or other material to be processed to perform the comminuting operation.

[0065] The grinding is carried out by rotation of the drum about its axis of rotation X. The rotation is provided by a drive unit 3, shown in FIG.

[0066] According to another aspect of the present invention, the rotating drum 2 has a truncated cone shape and has an axis inclined with respect to the horizontal plane. In other words, the dismantling machine is configured such that when the connection plane a is arranged to be parallel to the horizontal plane, the rotation axis X is inclined with respect to the horizontal plane. As a result, the rotation axis X is also inclined with respect to the connection plane a.

[0067] Preferably, the rotating drum 2 comprises an outer shell 26 defining a frusto-conical shape from which extend the teeth 20. In some embodiments, the rotating drum 2 defines a base surface 25 that substantially defines a smaller base of the frusto-conical shape, the base surface 25 comprising a plurality of additional teeth 20A.

[0068] Preferably, the inclination of the rotation axis X and the shape of the drum are such that the generatrix Y of the truncated cone is substantially parallel to the connection plane a. In particular, this is realized in the region of the generatrix Y in the region of the end of the rotary dismantler 100 opposite the connection plate 10. This generatrix is ​​thus parallel to the ground when the movable arm of the excavator is perpendicular to the ground, which allows maximum efficiency to be obtained during the crushing operation.

[0069] This feature can be obtained in some embodiments, for example as shown in FIG. 2, by providing the frustoconical shape defined by the rotating drum 2 with a conicity angle β substantially equal to twice the inclination angle α formed between the rotation axis X and the connection plane a.

[0070] In the context of the present invention, the term "substantially" means that it may include a deviation of ±5%.

[0071] In this way, the generatrix of the frusto-conical drum is horizontally oriented so as to achieve a simple construction, which is particularly suitable for withstanding the stresses to which the demolition machine is subjected during work on the ground.

[0072] In the embodiment shown in Figure 2, the tilt angle α is 20°, but more generally this angle is preferably in the range of 10° to 30°, more preferably in the range of 15° to 25°.

[0073] Advantageously, if two rotating drums are provided, the second drum is arranged symmetrically with respect to a vertical plane perpendicular to the generatrix Y of the cone.

[0074] Referring now again to FIG. 1, preferred characteristics of the support structure 1 and support arms 11 will now be described in more detail.

[0075] 2, the support arm 11 is preferably a lateral arm and has a side 12 arranged axially opposite the rotating drum 2 and defining an outer surface 12A of the arm 11. This outer surface preferably forms the outermost portion of the lateral arm and thus defines its dimensions.

[0076] In some embodiments, the outer surface 12A extends substantially perpendicular to and is substantially aligned with the connection plane a.

[0077] In some embodiments, the rotating drum 2 has an end 21 arranged to protrude relative to the above-mentioned side 12. This end is formed in the region of the larger diameter of the frustoconical shape and is arranged along the generatrix Y of the cone, as shown in the figure.

[0078] In other words, end 21 corresponds to the end that is oriented downwards in use.

[0079] The ends 21 may be aligned alternately with the sides 12. In this case, space requirements may be provided such that the outwardly facing part of the dismantling machine 100 along the direction of the cone generatrix Y is contained within the ends 21 of the drum.

[0080] In this way, no part of the side 12 comes into contact with the ground while the dismantling machine is being lowered onto the ground, i.e. while it is being moved in a direction perpendicular to the connection plane a.

[0081] It is also possible that in the region of the end axially opposite to the end 21 no part of the structure 1 projects beyond the rotating drum 2 .

[0082] In this case, in some embodiments, the teeth 20 may cover the most prominent part of the structure 1 taking into account the inclination of the drum 2 .

[0083] Indeed, in some embodiments, the teeth 20 arranged in the region of the end 21 project along a direction X away from the support structure 1 .

[0084] For this purpose, teeth 20 arranged in the area of ​​the narrowed diameter may be provided, so that the teeth 20 arranged in the area of ​​the narrowed diameter d define a rotational path in which they project in the direction X relative to the connecting plate 10.

[0085] In other words, the teeth 20 arranged adjacent the base surface 25 preferably project in a direction X away from the support structure 1 .

[0086] This can prevent collisions between the plate and the ground during machining operations perpendicular to the ground.

[0087] Also, according to another embodiment, the teeth 20 may define a rotational orbit with a diameter D, in a direction perpendicular to the generatrix Y, equal to or greater than the extent l of the support plate, as shown in Figure 3. The drum thus projects relative to the plate 10 and generally to the structure 1, including in a region in a direction perpendicular to the axial direction.

[0088] 2 and 3, in some embodiments the teeth 20 comprise a coupling element 24 connected to the outer shell 26 of the drum 2 and a cutting element 23 supported by the coupling element 24 and intended to come into contact with the surface to be machined. Preferably, the coupling element 24 is configured to support the cutting element 23 so that it extends in a direction that is inclined with respect to a direction perpendicular to the outer shell 26. In a preferred embodiment, the cutting element 23 has an inclination γ in the range of 20° to 70° with respect to a tangent direction of the outer shell 26 in the region of the coupling element 24, as shown in FIG.

[0089] Also, in some embodiments, the plurality of additional teeth 20A comprises a respective coupling element 28 connected to the base surface 25 of the drum 2 and a respective cutting element 27 supported by the coupling element 28 and intended to come into contact with the surface to be processed. Preferably, the coupling element 28 is configured to support the cutting element 27 so that it extends in a direction inclined with respect to the plane b defined by the base surface 25. Preferably, the coupling element 28 has an elongated shape and the cutting element 27 is aligned along the longitudinal direction of the coupling element 28. In a preferred embodiment, the coupling element 28 has an inclination δ with respect to the plane b in the range of 20° to 70°, as shown in FIG. 2.

[0090] Referring again to FIG. 1, the support structure 1 preferably comprises a pair of tapered connecting plates 13 which form a pair of additional walls of the support structure 1 .

[0091] The connecting plate 13 extends from the support plate 10 towards the support arm 11 and tapers away from the support plate 10, thereby defining the cantilevered configuration described above.

[0092] According to yet another embodiment, the drive unit 3 comprises a hydraulic motor 30 and a reduction gear 31, preferably of the planetary type.

[0093] Advantageously, the rotating drum 2 is hollow and the reduction gear 31 is received within a cavity 22 defined by the rotating drum 2 .

[0094] In some embodiments, the hydraulic motor 30 may be arranged to be inclined with respect to the reduction gear 31. This optimizes the overall dimensions of the drive unit. In general, the hydraulic motor 30 may have an axis of rotation R that is inclined with respect to the axis of rotation X.

[0095] In addition, the rotation axis of the reduction gear 31 may coincide with the rotation axis X of the rotating drum 2.

[0096] As shown in the embodiment of FIGS. 2 and 4, the rotating drum 2 may be connected to a reduction gear 31 for rotation by a connection flange 4 .

[0097] Advantageously, the connection flange 4 can be connected to an outer body 33 of the reduction gear 31 via a threaded connection 34 .

[0098] In a preferred embodiment, the connection flange 4 has a number of seats 40 extending in a direction substantially perpendicular to the axis of rotation X of the drum 2. This allows the drum 2 to be fixed to the connection flange 4 using a series of connection elements 42, such as screws, which engage in the seats 40, preferably arranged in the region of the outer shell 26, as shown in FIG.

[0099] In this way the drum can be constructed as a single piece and fixed to the drive unit 3 after assembly.

[0100] To allow easy access to the drive unit 3 without compromising the robustness of the structure, the side 12 preferably comprises a side wall 14 and a removable cover plate 15 for covering the opening 14A.

[0101] The invention thus solves the above-mentioned problems while at the same time offering several advantages, including the possibility of working at depth, and furthermore, the dismantling machine of the invention is particularly versatile and easy to handle, in particular due to its small dimensions.

[0102] The design of the demolition machine and the features of the drive unit ensure that sufficiently high power can be achieved even during demanding operations.

Claims

1. A rotary demolition machine (100) for a work machine, such as an excavator, comprising: a support structure (1) connectable to a movable arm of the work machine; a rotating drum (2) having a plurality of teeth (20); and a drive unit (3) configured to rotate the rotating drum (2) about a rotation axis (X), the rotating drum (2) having a frusto-conical shape; the support structure (1) comprising a connection plate (10) defining a connection plane (a) with the work machine, the connection plate (10) being such that the connection plane (a) is substantially parallel to the arm of the work machine. a support structure (1) configured to fix the rotary demolition machine (100) to an arm of the work machine so that the rotary demolition machine (100) is substantially vertical, the support structure (1) comprising an arm (11) that rotatably supports the rotary drum (2), the rotation axis (X) being inclined with respect to the connection plane (a) so that a generatrix (Y) of a truncated cone shape defined by the rotary drum (2) is substantially parallel to the connection plane (a), the generatrix (Y) being located at an end of the rotary demolition machine (100) opposite the connection plate (10).

2. 2. The rotary demolition machine (100) of claim 1, wherein the rotating drum (2) defines a base surface (25) opposite the end (21) along the axis of rotation (X) and comprises a plurality of additional teeth (20A).

3. 3. The rotary demolition machine (100) according to claim 1 or 2, wherein the truncated cone shape defined by the rotating drum (2) has a conicity angle (β) substantially equal to twice the inclination angle (α) formed between the rotation axis (X) and the connection plane (a).

4. The rotary demolition machine (100) according to claim 3, wherein the tilt angle (α) is in the range of 10° to 30°.

5. The rotary demolition machine (100) according to claim 3, wherein the tilt angle (α) is in the range of 15° to 25°.

6. 2. The rotary demolition machine (100) of claim 1, wherein the support structure (1) comprises a pair of tapered connecting plates (13) that form a pair of walls of the support structure (1), the connecting plates (13) extending from the support plate (10) towards the arm (11) that supports the rotating drum and tapering in a direction away from the support plate (10).

7. 2. The rotary demolition machine (100) according to claim 1, wherein the teeth (20) define a rotational orbit having a diameter (D) in a direction perpendicular to the generatrix (Y) of the cone, the diameter (D) being equal to or greater than the extent (l) of the support plate.

8. The rotary demolition machine (100) of claim 1, wherein the rotating drum (2) defines a large diameter portion (D) and a small diameter portion (d).

9. 9. The rotary demolition machine (100) according to claim 8, wherein the teeth (20) arranged in the region of the small diameter portion (d) define a rotational trajectory such that the teeth (20) arranged in the region of the small diameter portion (d) project relative to the connecting plate (10) parallel to the cone generatrix (Y).

10. 10. The rotary demolition machine (100) according to claim 8 or 9, wherein the teeth (20) arranged in the region of the large diameter part (D) of the rotating drum (2) do not protrude with respect to the connecting plate (10) parallel to the cone generatrix (Y).

11. 2. The rotary demolition machine (100) according to claim 1, wherein the drive unit (3) comprises a hydraulic motor (30) and a preferably planetary reduction gear (31), the hydraulic motor having a rotation axis (R) inclined with respect to the rotation axis (X) of the rotating drum, and the reduction gear having a rotation axis coinciding with the rotation axis (X) of the rotating drum.

12. 12. The rotary demolition machine (100) according to claim 11, wherein the rotating drum (2) is hollow and the reduction gear is received within a cavity (22) defined by the rotating drum (2).

13. 2. The rotary demolition machine (100) according to claim 1, wherein the teeth (20) comprise a coupling element (24) connected to an outer shell (26) of the rotating drum (2) and a cutting element (23) supported by the coupling element (24) and intended to come into contact with the surface to be processed, the coupling element (24) being configured to support the cutting element (23) so that it extends in a direction inclined with respect to a direction perpendicular to the outer shell (26).

14. 14. The rotary demolition machine (100) according to claim 13, wherein the cutting elements (23) have an inclination (γ) in the range of 20° to 70° relative to a tangent direction of the outer shell (26) in the region of the connecting elements (24).

15. A rotary demolition machine (100) according to claim 9 when dependent on claim 8, wherein the teeth (20) protrude outward from the rotating drum (2) in the region of the small diameter portion (d).

16. 3. The rotary demolition machine (100) according to claim 2, wherein the plurality of additional teeth (20A) comprise respective coupling elements (28) connected to the base surface (25) of the rotating drum (2) and respective cutting elements (27) supported by the respective coupling elements (28) and intended to come into contact with the surface to be processed, the respective coupling elements (28) being configured to support the respective cutting elements (27) so that they extend in a direction inclined with respect to a plane (b) defined by the base surface (25).

17. The rotary demolition machine (100) according to claim 1, comprising a single rotating drum (2).

18. 18. The rotary demolition machine (100) according to claim 17, wherein the arm (11) has a side (12) arranged axially opposite the rotating drum (2) and defining an outer surface (12A) of the arm (11).

19. 19. The rotary demolition machine (100) according to claim 18, wherein the outer surfaces (12A) of the lateral arms (11) extend substantially perpendicular to the connection plane (a).

20. 20. The rotary demolition machine (100) according to claim 18 or 19, wherein the end (21) of the rotating drum (2) is aligned with the side (12) along a direction parallel to the cone generatrix (Y) or protrudes relative to the side (12) along a direction parallel to the cone generatrix (Y).

21. 19. The rotary demolition machine (100) of claim 18, wherein the side (12) comprises a side wall (14) and a removable cover plate (15), the side wall having an opening (14A) configured to allow access to the drive unit (3), the opening (14A) configured to be closable by the removable cover plate (15).

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