EP4453325B1 - Fräsaufsatz und arbeitsmaschine mit solch einem aufsatz - Google Patents

Fräsaufsatz und arbeitsmaschine mit solch einem aufsatz

Info

Publication number
EP4453325B1
EP4453325B1 EP22826452.9A EP22826452A EP4453325B1 EP 4453325 B1 EP4453325 B1 EP 4453325B1 EP 22826452 A EP22826452 A EP 22826452A EP 4453325 B1 EP4453325 B1 EP 4453325B1
Authority
EP
European Patent Office
Prior art keywords
cutter
attachment
arm
receiving
guide means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP22826452.9A
Other languages
English (en)
French (fr)
Other versions
EP4453325C0 (de
EP4453325A1 (de
Inventor
Giampiero GROTTI
Michele GROTTI
Giuliano GROTTI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grotti Srl
Original Assignee
Grotti Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Grotti Srl filed Critical Grotti Srl
Priority to SM20250472T priority Critical patent/SMT202500472T1/it
Publication of EP4453325A1 publication Critical patent/EP4453325A1/de
Application granted granted Critical
Publication of EP4453325C0 publication Critical patent/EP4453325C0/de
Publication of EP4453325B1 publication Critical patent/EP4453325B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/18—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels
    • E02F3/188—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels with the axis being horizontal and transverse to the direction of travel
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/18—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels
    • E02F3/20—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels with tools that only loosen the material, i.e. mill-type wheels
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/283—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a single arm pivoted directly on the chassis

Definitions

  • the present invention concerns a scarifier attachment and an operating machine comprising such an attachment.
  • the invention has been developed with particular reference to "special scarifications" in the construction and infrastructure sector, as defined below.
  • the invention is intended for the removal of material such as concrete and/or asphalt, preferably along both curvilinear and straight paths.
  • Scarification can have several reasons. For example, it is used for restoring artifacts wherein part of the concrete or asphalt is removed to replace it with new layers.
  • the surface to be restored can be of any type, for example the curved vault of a road tunnel, the kerb of a viaduct, a flat wall of a containment wall, etc.
  • Scarification can also be used to excavate or widen passages, such as road tunnels, rooms within them or the like, railway tunnels and supply channels for water or hydroelectric reservoirs, especially in the presence of hard layers of soil, such as rock.
  • Scarification can also be used for a demolition purpose, or for cutting material, for example to cut gutters or dig trenches.
  • the previous application was about a process for managing the power of the machine to give continuity and uniformity of work to the cutter.
  • the power available to the scarifier attachment mounted on the machine can be much higher than that available to a common earth-moving machine, because of which the planers normally available on the market are inadequate.
  • planers An example of such planers is given in the previous European patent application No. EP3719209A2 by SIMEX Engeneering srl .
  • This planer has a rotary cutting attachment mounted cantilevered on a frame for excavation depth adjustment needs.
  • a single motor is coupled to the rotary cutting attachment by means of a coupling flange placed inside the latter ( fig. 5 of EP3719209A2 ).
  • Aim of the present invention is to overcome all, or some, of the drawbacks of the prior art.
  • a preferred aim of the present invention is to provide an attachment with low needs for stopping for restoration, in particular for penetration of debris and/or concrete bars twisted around the rotor, and/or which allows an easy and fast restoration when necessary.
  • a further aim of the present invention is to provide an attachment protected against the penetration of the excavated debris and bars and which at the same time allows the use of very high hydraulic powers for a high productivity.
  • a further aim of the present invention is to provide an easy and inexpensive machine.
  • the present invention concerns a scarifier attachment (20) comprising at least one arm (38, 39) placed to support a cutter (40) rotatably around a rotation axis (Y), characterized in that said arm (38, 39) supports receiving and guide means (92) of any bars that the cutter (40) finds in the concrete during the excavation and that it drags along with it, wherein the receiving and guide means (92) are arranged laterally to the cutter with reference to the axial direction.
  • an interspace (100), arranged to generate a distance Z in the axial direction.
  • the receiving and guide means (100) comprise at least one guide surface (93) of the bars with an inclination with respect to the rotation axis (Y) such as to guide said bars away from the cutter (40).
  • said inclination is such that said guide surface (110) has a first portion axially distal from said cutter and radially proximal to said axis Y, and a second portion axially proximal from said cutter and radially distal from said axis Y.
  • the receiving and guide means (92) comprise at least one rod integral with one of said arms (38, 39) so as to be protruding in a direction inclined with respect to the rotation axis (Y), wherein said rod has a joining point to said arm proximal to said axis, and an end opposite to the affixing point that is free and distal from said axis (Y).
  • the attachment comprises rotatable coupling means (50, 52) interposed between said arm (38, 39) and the cutter so as to define an interspace (90) between them and the cutter in the radial direction, wherein said receiving and guide means (92) are placed at least partially radially above said radial interspace (90) and at least partially laterally thereto in the axial direction (Y).
  • said rotatable coupling means (52) are contained in a cavity (47a, 47b) of the cutter, while said receiving and guide means (92) are lateral thereto.
  • said receiving and guide means (92) have a maximum radial extension flush with the maximum outer diameter of the cutter or smaller than it.
  • the cutter (40) is supported near both its axial ends by respective two arms (38, 39) wherein between each of the arms and the cutter there are the features of said respective claims.
  • the cutter comprises a hollow cylindrical body (42) with an outer cylindrical surface (44) with a diameter greater than or equal to 400 mm, for example greater than or equal to 450 mm, preferably equal to 478 mm, wherein the cylindrical body comprises at least a central area with thickness greater than or equal to 50 mm, for example greater than or equal to 60mm, preferably greater than or equal to 70mm, for example equal to 74mm.
  • the invention concerns an operating machine for scarification comprising an undercarriage (5), a carriage (10) and coupling means rotatable (12) between them around a vertical axis (X), wherein:
  • the machine 1 is as a whole a vehicle equipped with an undercarriage 5 movable with respect to the ground, on which a carriage 10 is rotatably mounted, around a vertical axis X.
  • the latter supports and drags into rotation along with it an operating arm 15 and a scarifier attachment 20 placed at the distal end of said arm.
  • the operating arm 15 is preferably coupled to the carriage 10 movably above it, around a pin 35 with horizontal axis Y'.
  • the arm 15 is rotatable in a vertical plane between a lowered operating position, and a raised operating position.
  • the scarifier attachment 20 comprises a frame 30 and a cutter 40 supported rotatably by said frame.
  • the frame 30 comprises a coupling portion 32 for coupling to the operating arm 15, and a fork 34 for coupling to the cutter 40.
  • the frame 30 can for example be made in two parts 36 and 37, each comprising a respective arm 38 and 39 of the fork, preferably joined together in a separable manner, for example by means of bolts.
  • the cutter 40 is supported by both arms 38 and 39 of the fork, rotatably with respect to them about an axis Y.
  • the mounting of the scarifier attachment 20 on the operating arm 15 is such that preferably the axes Y and Y' are parallel, so that the axis Y is preferably horizontal.
  • a cutter is generally a rotary cutting attachment that removes the material in a direction perpendicular to its own rotation axis Y.
  • the cutter 40 has a substantially cylindrical body 42 with a substantially cylindrical outer surface 44 coaxial to the axis Y and provided with a plurality of knives 46.
  • the cylindrical body 42 has a cavity 47a and 47b at least at each axial end, and preferably cylindrical.
  • Preferably said end cavities 47a and 47b are part of a single cavity 47 that axially crosses the cylindrical body 42.
  • the cylindrical body 42 is supported near both its axial ends by the respective arms 38 and 39 of the fork, by interposition of respective rotatable coupling means 50 and 52, wherein said rotatable coupling means 50 and 52 are at least partially housed within said respective end cylindrical cavities 47a and 47b.
  • the rotatable coupling means 50 and 52 each comprise a first body 54, 55 and a second body 64, 65 which are rotatable with respect to each other about the axis Y.
  • the first body 54, 55 serves as a shield of the respective end cylindrical cavity 47a, 47b and for this reason it is cylindrical in shape. It is fixed with respect to the fork 34 and coaxial to the cutter 40.
  • Each shielding body 54 and 55 has an outer cylindrical surface at least partially radially facing a corresponding inner cylindrical end surface of the cutter 58 and 59. Said inner cylindrical surfaces are surfaces of said end cylindrical cavities 47a and 47b.
  • outer and inner cylindrical surfaces are separated by an interspace 90 given by a distance in the radial direction D less than or equal to 10 mm, wherein 3 mm or 4 mm or 5 mm are preferred values.
  • any revolution surface around the axis Y can be replaced at said cylindrical surfaces.
  • each shielding body 54, 55 is coupled to the respective fork arm 38 and 39 in the axial direction (with reference to the axis Y).
  • Each second body 64 to 65 is fixedly coupled to the cylindrical body 40 inside the respective end cavity 47a and 47b.
  • the first coupling means 50 comprise a motor, preferably hydraulic, wherein the shielding body 54 comprises the motor housing and wherein the corresponding second body 64 comprises the motor shaft.
  • the shaft 64 in particular is coupled within the cavity 47a by means of a radial flange 74.
  • the second coupling means 52 comprise a bearing 80, preferably an oscillating bearing with a radially outer fifth wheel 82 and a radially inner fifth wheel 84, wherein the shielding body 55 comprises or provides a seat for the outer fifth wheel 82, and wherein the corresponding second body 65 comprises or provides a seat for the inner fifth wheel 84.
  • the inner fifth wheel 84 in particular is coupled inside the cavity 47b by means of a pin 70 axially protruding from a radial flange 72 fixed in said cavity.
  • Said pin 70 is a seat of the inner fifth wheel 84 of the bearing, and can be inserted and extracted from it in an axial direction.
  • the pin 70 is integral with the cylindrical body 42 and the arms 38 and 39 of the fork can be joined and separated from each other by means of an approach and distancing movement in the axial direction.
  • the mounting process allows the motor 50 to be fixed inside the cavity 47a of the cylindrical body 42 and to the arm 38.
  • the bearing 52 is coupled to the arm 39 and inserted into the pin 70 bringing the two arms 38 and 39 closer in the axial direction, so as to close the motor 50, the cylindrical body 42 and the bearing 52 like a package between the two arms 38 and 39.
  • the outer fifth wheel is coupled to the cylindrical body and the inner fifth wheel to the arm 39.
  • both coupling means 50 and 52 are motors and the cylindrical body 30 is preferably divided into two parts which are rotatable with respect to each other, each put into rotation by one of the two motors.
  • the cavities 47a and 47b are cylindrical seats that constitute an enlargement of the through cavity 47, whereby they form respective steps with respect to it, useful to provide an axial stop for coupling the second bodies 64 and 65.
  • the cylindrical body 42 has an outer cylindrical surface 44 with a diameter greater than or equal to 400 mm, for example greater than or equal to 450 mm, preferably equal to 478 mm, wherein the cylindrical body comprises at least a minimum inner diameter less than or equal to 350mm, preferably less than or equal to 330mm.
  • the cylindrical body for example, comprises a radial section, for example in a central area, with thickness greater than or equal to 50 mm, for example greater than equal to 60 mm, preferably greater than or equal to 70 mm, for example equal to 74 mm.
  • the cylindrical body 42 preferably has a length in the direction of its rotation axis greater than or equal to 1000mm, for example greater than or equal to 1200mm.
  • the cutter is made of metal material, for example steel.
  • each of the fork arms 38 and 39 supports protection means 92 of the interspace 90 having the function of intercepting any reinforcing bars that the cutter drags along with it twisting them on the sides of the cylindrical body 42.
  • Said protection means 92 comprise one or more interception elements for each arm 38 and 39 supported interposed between said arms and the cylindrical body 42, in sliding contact with the latter or with a second interspace 100 of separation between them, preferably arranged to generate a distance Z in the axial direction.
  • the distance Z is preferably less than or equal to 2 mm, more preferably 1 mm.
  • the protection means 92 preferably comprise at least one guide surface 93 of the intercepted bars with an inclination with respect to the rotation axis Y such as to guide said bars away from the cutter 40.
  • the protection means 92 comprise at least one rod affixed to a relative fork arm 38, 39 in a direction inclined with respect to the rotation axis Y, wherein the affixing point is proximal to said axis, and the opposite end is distal.
  • the cutter 40 sets considerable amounts of debris in motion and when it encounters reinforcing bars embedded in the concrete, drags them into rotation.
  • the coupling scheme of the cutter through the two interspaces 90 offers a function of protection against debris and especially against bars. In fact, the latter are kept outside the cutter, where they twist in an exposed and visible way and can easily be reached by an operator to be cut, for example with a grinder, and removed.
  • the cutter is able to take advantage of higher powers and excavation depths.
  • protection means 92 intercept the bars and provide them with a seat around which to twist and remain exposed and visible for removal.
  • protection means 92 is also applicable to frames that support the cutter on one side only, cantilevered from a single arm, such a possible variant is not illustrated.
  • a further advantage of use is the aspect of the thickness of the cylindrical body, which, being very high allows to regulate the operation in the face of greater resistances encountered, especially when it encounters said reinforced concrete bars.
  • the term “comprising” and its derivatives, as used herein, are intended as open-ended terms that specify the presence of declared characteristics, elements, components, groups, integers and/or steps, but do not exclude the presence of other undeclared characteristics, elements, components, groups, integers and/or steps.
  • the above also applies to words, which have similar meanings, such as the terms “comprised”, “have” and their derivatives.
  • the terms "part”, “section”, “portion”, “member” or “element” when used in the singular can have the double meaning of a single part or a plurality of parts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (10)

  1. Vertikutiereraufsatz (20) mit mindestens einem Arm (38, 39), der so angeordnet ist, dass er ein Schneidwerkzeug (40) drehbar um eine Drehachse (Y) trägt, dadurch gekennzeichnet, dass der Arm (38, 39) Aufnahme- und Führungsmittel (92) für Stäbe trägt, die das Schneidwerkzeug (40) während des Aushubs im Beton findet und mit sich zieht, wobei die Aufnahme- und Führungsmittel (92) seitlich des Schneidwerkzeugs in Bezug auf die axiale Richtung angeordnet sind, wobei der Aufsatz drehbare Kupplungsmittel (50, 52) umfasst, die zwischen dem Arm (38, 39) und dem Schneidwerkzeug angeordnet sind, um einen Zwischenraum (90) zwischen ihnen und dem Schneidwerkzeug in der radialen Richtung zu definieren, wobei die Aufnahme- und Führungsmittel (92) zumindest teilweise radial oberhalb des radialen Zwischenraums (90) und zumindest teilweise seitlich davon in der axialen Richtung (Y) angeordnet sind.
  2. Aufsatz nach Anspruch 1, wobei zwischen den Aufnahme- und Führungsmitteln (92) und dem Schneidwerkzeug ein Zwischenraum (100) vorhanden ist, der angeordnet ist, um einen Abstand Z in axialer Richtung zu erzeugen.
  3. Aufsatz nach Anspruch 2 oder 3, wobei die Aufnahme- und Führungsmittel (100) mindestens eine Führungsfläche (93) für die Stäbe mit einer Neigung in Bezug auf die Drehachse (Y) umfassen, um die Stäbe von dem Schneidwerkzeug (40) wegzuführen.
  4. Aufsatz nach Anspruch 3, dadurch gekennzeichnet, dass die Neigung derart ist, dass die Führungsfläche (110) einen ersten Abschnitt axial distal von dem Schneidwerkzeug und radial proximal zu der Achse Y und einen zweiten radialen Abschnitt axial proximal von dem Schneidwerkzeug und distal von der Achse Y aufweist.
  5. Aufsatz nach Anspruch 4, dadurch gekennzeichnet, dass die Aufnahme- und Führungsmittel (92) mindestens eine Stange umfassen, die einstückig mit einem der Arme (38, 39) ausgebildet ist, so dass sie in einer Richtung vorsteht, die in Bezug auf die Drehachse (Y) geneigt ist, wobei die Stange einen Verbindungspunkt mit dem Arm proximal zu der Achse und ein Ende gegenüber dem Befestigungspunkt aufweist, das frei und distal von der Achse (Y) ist.
  6. Aufsatz nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die drehbaren Kupplungsmittel (52) zumindest teilweise in einem Hohlraum (47a, 47b) des Schneidwerkzeugs enthalten sind, während die Aufnahme- und Führungsmittel (92) zumindest teilweise seitlich davon angeordnet sind.
  7. Aufsatz nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Aufnahme- und Führungsmittel (92) eine maximale radiale Erstreckung aufweisen, die mit dem maximalen Außendurchmesser des Schneidwerkzeugs fluchtet oder kleiner als dieser ist.
  8. Aufsatz nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Schneidwerkzeug (40) in der Nähe seiner beiden axialen Enden durch jeweils zwei Arme (38, 39) getragen wird, wobei zwischen jedem der Arme und dem Schneidwerkzeug die Merkmale der jeweiligen Ansprüche vorhanden sind.
  9. Aufsatz nach einem der vorhergehenden Ansprüche, wobei das Schneidwerkzeug einen hohlen Körper (42) mit einer zylindrischen Außenfläche (44) mit einem Durchmesser größer als oder gleich 400 mm umfasst, wobei der Körper mindestens einen radialen Abschnitt mit einer Dicke größer als oder gleich 50 mm umfasst, und wobei die Länge des Körpers in der axialen Richtung größer als oder gleich 1000 mm ist.
  10. Arbeitsmaschine zum Vertikutieren mit einem Fahrgestell (5), einem Schlitten (10) und dazwischen um eine vertikale Achse (X) drehbaren Kupplungsmitteln (12), wobei:
    - der Schlitten einen Arm (15) trägt, an dessen distalem Ende ein Vertikutiereraufsatz (20) angeordnet ist; wobei der Arm (15) oberhalb des Schlittens (10) beweglich ist, um sich in einer vertikalen Ebene zwischen einer abgesenkten Betriebsposition und einer angehobenen Betriebsposition zu drehen;
    dadurch gekennzeichnet, dass der Vertikutiereraufsatz von der Art nach einem der vorhergehenden Ansprüche ist.
EP22826452.9A 2021-12-20 2022-12-14 Fräsaufsatz und arbeitsmaschine mit solch einem aufsatz Active EP4453325B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SM20250472T SMT202500472T1 (it) 2021-12-20 2022-12-14 Attrezzo scarificatore e macchina operatrice comprendente tale attrezzo

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102021000031778A IT202100031778A1 (it) 2021-12-20 2021-12-20 Attrezzo scarificatore e macchina operatrice comprendente tale attrezzo
PCT/IB2022/062199 WO2023119067A1 (en) 2021-12-20 2022-12-14 Scarifier attachment and operating machine comprising such an attachment

Publications (3)

Publication Number Publication Date
EP4453325A1 EP4453325A1 (de) 2024-10-30
EP4453325C0 EP4453325C0 (de) 2025-12-10
EP4453325B1 true EP4453325B1 (de) 2025-12-10

Family

ID=80461042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22826452.9A Active EP4453325B1 (de) 2021-12-20 2022-12-14 Fräsaufsatz und arbeitsmaschine mit solch einem aufsatz

Country Status (4)

Country Link
EP (1) EP4453325B1 (de)
IT (1) IT202100031778A1 (de)
SM (1) SMT202500472T1 (de)
WO (1) WO2023119067A1 (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2620362A1 (de) * 1976-05-06 1977-11-17 Jacques Henri Maurice Marais Radgrabenbagger
US5315770A (en) * 1992-12-15 1994-05-31 Astec Industries, Inc. Roadway trenching apparatus
GB0904838D0 (en) * 2009-03-20 2009-05-06 I3 Group Ltd Trench cutting apparatus
EP2518217A1 (de) * 2011-04-27 2012-10-31 Jürgen Stehr Grabenfräse
EP3719209A3 (de) 2019-04-02 2020-10-21 Simex S.r.l. Baggeranordnung und arbeitsmaschine mit dieser anordnung

Also Published As

Publication number Publication date
EP4453325C0 (de) 2025-12-10
WO2023119067A1 (en) 2023-06-29
IT202100031778A1 (it) 2023-06-20
EP4453325A1 (de) 2024-10-30
SMT202500472T1 (it) 2026-01-12

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