EP2218829B1 - Cutting bit for a slotted wall cutter - Google Patents

Cutting bit for a slotted wall cutter Download PDF

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Publication number
EP2218829B1
EP2218829B1 EP10001172.5A EP10001172A EP2218829B1 EP 2218829 B1 EP2218829 B1 EP 2218829B1 EP 10001172 A EP10001172 A EP 10001172A EP 2218829 B1 EP2218829 B1 EP 2218829B1
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EP
European Patent Office
Prior art keywords
cutting
tooth
cutters
symmetry
plane
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EP10001172.5A
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German (de)
French (fr)
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EP2218829A3 (en
EP2218829A2 (en
Inventor
Wilhelm Ruby
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Bauer Maschinen GmbH
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Bauer Maschinen GmbH
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Publication of EP2218829A2 publication Critical patent/EP2218829A2/en
Publication of EP2218829A3 publication Critical patent/EP2218829A3/en
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
    • E02F9/2808—Teeth
    • E02F9/2858—Teeth characterised by shape
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/13—Foundation slots or slits; Implements for making these slots or slits
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
    • E02F9/2866—Small metalwork for digging elements, e.g. teeth scraper bits for rotating digging elements

Definitions

  • the invention relates to a cutting tooth according to the preamble of claim 1.
  • a cutting tooth is formed with a tongue-shaped tooth root for receiving in a cutting wheel, wherein the tongue-shaped tooth root has a peripheral circumferential retaining groove, and at least one cutting edge, which is arranged on the tooth base on the head side.
  • a generic cutting tooth goes out of the EP 1 780 375 A1 out.
  • the cutting tooth is formed symmetrically to a longitudinal plane, which runs parallel to and between the U-shaped side surfaces and in the milling direction.
  • Other cutting teeth are for example from the EP 1 780 375 A1 and the EP 0 916 771 A2 known.
  • the known milling teeth are inserted with their tooth feet in Fräs leopardhalter, which are circumferentially provided on the cutting wheel.
  • a peripheral retaining groove is provided circumferentially on the tooth root, in which engages a corresponding profile on the Fräs leopardhalter.
  • the cutting teeth on cutting which are arranged at the top of the tooth root.
  • the DE 1 749 015 U , the DE 39 20 011 C3 , the DE 195 47 170 C2 , the GB 714,251 , the GB 2 053 315 A , the US 2,690,904 , the US 4,120,106 , the US 5,810,449 and the EP 1 452 686 A1 describe tooth arrangements for cutting wheels, wherein the cutting wheels are provided for changing directions of rotation.
  • the tooth arrangements have movable elements whose position is changed relative to the cutting wheel when changing the direction of rotation.
  • the US 3,629,964 and the US 3,755,933 describe chisel inserts for soil cultivation, which can be mounted in different positions.
  • the object of the invention is to develop a generic cutting tooth so that with high reliability, high efficiency and long life particularly versatile applications are given.
  • a basic idea of the invention is to make the cutting tooth mirror-symmetrical, so that both the tongue-shaped tooth root and the cutting edges are arranged symmetrically to the same mirror plane.
  • a cutting tooth is provided with at least two opposing cutting edges which intersect in opposite directions.
  • the cutting tooth according to the invention can always be brought intersecting with the upcoming soil even with reversing direction of rotation of the cutting wheel.
  • This method of operation is of particular interest in the so-called "cutter soil mixing" process, in which the milled soil material for producing hardened diaphragm wall panels in the slot is mixed by a cutting wheel effect with a binder.
  • the reversing direction of rotation of the cutting wheels allows a particularly good mixing of the settable suspension.
  • the milled soil material can be further digested and crushed by the changing direction of rotation of the cutting wheels.
  • a tongue-shaped tooth root can be understood in particular a side view of a U-shaped tooth root and / or a tooth root, which has a rectangular side part and a semicircular foot part in side view.
  • the cutting edges are arranged according to the invention on the head side of the tooth root, which faces away from the semicircular foot part.
  • the cutting edges according to the invention are expediently carbide cutters.
  • a trench wall cutter Under a trench wall cutter can be understood in particular a milling machine with a frame, on the underside of cutting wheels are arranged, which can milled soil material when vertical lowering of the frame in the ground below the frame and thereby create a slot.
  • the cutting wheels of the trench wall cutter together have a rectangular milling cross section.
  • at least four cutting wheels can be provided. These four cutting wheels are expediently arranged in the form of two pairs of cutting wheels, the two cutting wheels of each pair of cutting wheels having a common axis of rotation.
  • the two common axes of rotation are expediently arranged in parallel, and preferably each of the cutting wheels of a cutting wheel pair is aligned with a cutting wheel of the adjacent cutting wheel pair.
  • the plane of symmetry is perpendicular to a U-shaped side surface of the tooth root. In this way, a particularly compact and at the same time robust tooth arrangement can be obtained.
  • the plane of symmetry runs at least approximately perpendicular to the cutting direction of the cutting edges and / or through a longitudinal axis of the tooth root.
  • a plane of symmetry may also be provided parallel to the U-shaped side surface of the tooth root.
  • the cutting tooth is formed mirror-symmetrically to a further plane of symmetry, which is perpendicular to the aforementioned plane of symmetry. This allows a particularly uniform application of force and thus a particularly good cutting action.
  • the cutting edges are at least partially polyhedron-shaped.
  • an exposed portion of the cutting can be polyhedron-shaped.
  • the cutting edges each have at least one cutting edge.
  • the respective cutting edge can be wedge-shaped.
  • Each cutting edge can also have several cutting edges.
  • it can be provided that a plurality of cutting edges of the cutting converge on a cutting tip.
  • at least one cutting edge is provided, which extends at least approximately parallel to the surface of symmetry, that is with the symmetry surface forms an angle ⁇ 20 °.
  • the cutting tooth has at least one head-side W-profile, which preferably extends over both oppositely arranged cutting.
  • the cutting tooth on the head side in particular in side view and / or viewing direction parallel to the plane of symmetry, at least one W-shaped edge which is partially formed by the two opposite cutting, in particular by cutting edges of the cutting.
  • Such a W-profile allows a reliable attachment of the cutting edges on the tooth root.
  • this arrangement can allow a reversing rotary operation of the cutting wheel, without it being necessary to provide the cutting tooth movable on the cutting wheel.
  • a particularly compact and robust arrangement is given by the fact that the plane of symmetry of the cutting tooth extends through a central vertex of the head-side W-profile, and / or that the outer legs of the head-side W-profile are at least partially formed by the cutting.
  • the outer legs may be formed by wedge-shaped cutting edges of the blades.
  • the inner legs of the head-side W-profile are expediently formed by the tooth root, in particular of wedge-shaped edges of the tooth root.
  • the cutting tooth according to the invention can be used for a reversing Fräsrad ist without this he would have to be stored on the cutting wheel movable. It is thus particularly advantageous that the cutting edges are arranged immovably on the tooth root, and / or that the tooth root is arranged immovably on the cutting wheel.
  • the two cutting edges are each designed as double cutting edges, in particular with parallel cutting edges.
  • the two opposite Each cut two individual cutting elements, which are preferably connected.
  • the individual cutting edges are expediently polygonal-shaped, at least in regions.
  • the double cutting edges have parallel cutting edges, that is to say at least one of the cutting edges of one of the individual cutting edges is formed parallel to a cutting edge of the other individual cutting edge of the respective double cutting edge.
  • the double cutters expediently have a plurality of parallel cutting edges.
  • a particularly robust arrangement is given by the fact that the two individual cutting edges are arranged adjacent to a double cutting edge, preferably abut each other. Conveniently, the double cutting edges are each formed in one piece.
  • the individual cutting edges can in particular be wedge-shaped.
  • the double cutters preferably at least when viewed perpendicularly to the plane of symmetry, have a W-shaped profile.
  • the left legs of the W-shaped profile can be formed by a first single cutting edge and the right leg of the W-shaped profile of a second single cutting edge of the same double cutting edge.
  • cutting edges are formed at the off-center vertices of the W-shaped profile.
  • the W-shaped profile of the double cutters in the tooth root is continued and preferably passes through the plane of symmetry.
  • a W-profile is given both in the section of the double cutters and in the section of the head-side Zahnfußabiteses, which connects the double cutting edges.
  • the double cutters it is advantageous for the double cutters to have a W-shaped profile when viewed from above on the tooth head and / or when viewed parallel to the plane of symmetry.
  • the mechanical load capacity of the cutting tooth can be further increased by providing at least one pyramid-shaped cutting support structure at the tooth root in the region of the cutting edges.
  • each individual cutting edge has a pyramidal cutting support structure.
  • the cutting support structure may in particular have the shape of a leaning pyramid.
  • a rectangular pyramid, preferably a square pyramid, may be provided.
  • the peripheral circumferential retaining groove has a triangular cross-section.
  • the corresponding fastening element on the milling tooth holder can then have a corresponding triangular profile.
  • a further preferred embodiment of the invention consists in that the tooth root has two retaining bores arranged mirror-symmetrically to the plane of symmetry for fastening the cutting tooth to the cutting wheel.
  • these retaining holes holding bolts can be pushed, which secure the tooth root on the Fräs leopardhalter.
  • it can be provided to secure the cutting tooth only with a single bolt on the cutting tooth holder, which is inserted through one of the retaining holes.
  • the mirror-symmetrical arrangement of the two retaining bores makes it possible to turn the tooth on the cutting tooth holder and to use the same bolt arrangement even when the cutting tooth is reversed.
  • the retaining holes can pierce the retaining groove at least partially. In this case, the bolts can be secured in the fastening element of the cutting wheel, which corresponds to the retaining groove.
  • a tool bore for a removal tool is provided in the tooth root.
  • a force can be applied to the tooth root, with which the tooth root can be released from the corresponding Fräs leopardhalter.
  • the axis of the tool bore extends in the plane of symmetry.
  • the tool bore is offset from the holding holes towards the tooth head.
  • the invention also relates to a construction machine, in particular a trench wall cutter, with at least one cutting wheel on which at least one cutting tooth according to one of the preceding claims is arranged.
  • the cutting tooth shown in the figures has a tongue-shaped tooth root 1, which in side view (FIG. Fig. 1 ) Is U-shaped.
  • the tooth base 1 is circumferentially surrounded by a likewise U-shaped retaining groove 11. How the particular FIGS. 2 and 4 show, this retaining groove 11 in cross-section on a triangular profile, which extends into the tooth root 1 inside.
  • the tooth root 1 is delimited by two parallel side surfaces which run along the tooth root from bottom to top.
  • a respective cutting edge 2, 2 ' is arranged on opposite Zahnfußdon.
  • the cutting edges 2, 2 ' are each designed as double cutting and, as such, have two wedge-shaped individual cutting edges. In the figures, only the individual cutting edges 22, 22 'of the cutting edge 2 are provided with reference numerals.
  • the second cutting edge 2 ' is formed analogously with two individual cutting edges.
  • the individual cutting edges 22, 22 'each have a double wedge structure with two approximately mutually perpendicular, merging wedges, each of the two wedges defining a cutting edge 33 or 34 ( Fig. 1 ).
  • the lateral cutting edge 33 and the upper cutting edge 34 run together in each case in a cutting tip 35 of the associated individual cutting edge 22.
  • each of the cutting support structures 15 supports in each case one of the individual cutting edges 22.
  • the respective individual cutting edge 22 bears against a lateral surface of the respective cutting support structure 15.
  • the tooth root has a taper to prevent unnecessary tooth root wear.
  • the entire cutting tooth including the tooth root 1, the cutting edges 2, 2 ', the holding bores 18, 18' and the tool bore 19, is mirror-symmetrical to a first plane of symmetry 71 (FIG. FIGS. 1 and 4 ) educated.
  • This plane of symmetry runs in Fig. 1 perpendicular to the drawing plane and Fig. 2 parallel to the plane from the tooth tip to the tooth base. Due to the mirror symmetry to the plane of symmetry 71 of the cutting tooth is suitable for a milling operation in opposite directions of milling (to the left and to the right in Fig. 1 ).
  • the cutting tooth is also mirror-symmetrical to a second plane of symmetry 72 (FIG. FIGS. 2, 3 and 4 ) educated.
  • the second plane of symmetry 72 runs perpendicular to the first plane of symmetry 71 from the tooth tip to the tooth root.
  • the second plane of symmetry 72 extends through the cutting edges 2, 2', between the two individual cutting edges 22 and 22 ', parallel to the drawing plane Fig. 1 and perpendicular to the plane of the Fig. 2 ,
  • the cutting tooth on a head-side W-profile 21 As in particular in Fig. 1 can be seen, the cutting tooth on a head-side W-profile 21.
  • This W-profile is formed on the outside by the two cutting edges 2, 2 'and on the inside by the tooth root 1.
  • the middle vertex of the W-profile 21 is located in the plane of symmetry 71.
  • the outer legs of the W-profile are formed by the upper cutting edges 34 of the two blades 2 and 2 '.
  • Fig. 2 shows, form the two individual cutting edges 22, 22 'with their wedge structures in front view of the cutting tooth, so with a view in cutting direction of Cutting 2 ( Fig. 2 ), another W-shaped profile 29.
  • This inverted W-shaped profile 29 protrudes on the top of the tooth head.
  • the off-center vertices of the W-shaped profile 29 are formed by the upper cutting edges 34.
  • this inverted W-shaped profile 29 extends over the entire head side of the cutting tooth, that is, the W-shaped profile 29 is both in the area of the cutting edges 2, 2 'and in the head-side Zahnfuß Scheme 60, which between the cutting edges 2, 2 'lies, given.
  • FIG. 3 Another reverse W-shaped profile 30 is in plan view ( Fig. 3 ).
  • This profile 30, which protrudes on the front side of the tooth head, is formed by the second wedge shape of the double wedge structure of the two individual cutting edges 22, 22 ', that is, the off-center vertex of the other W-shaped profile 30 are formed by the lateral cutting edges 33.
  • the cutting tooth is received in a cutting tooth holder, not shown, of a cutting wheel.
  • a corresponding profile element engages in the retaining groove 11 and secures the cutting tooth on the Fräs leopardhalter.
  • a retaining bolt can then be introduced into one of the two retaining bores 18 or 18 '.
  • the cutting wheel is then set in rotation, wherein the cutting edge leading in the cutting direction 2 or 2 'ablates existing soil material.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Milling Processes (AREA)
  • Knives (AREA)

Description

Die Erfindung betrifft einen Fräszahn gemäß dem Oberbegriff des Anspruchs 1. Ein derartiger Fräszahn ist ausgebildet mit einem zungenförmigen Zahnfuß zur Aufnahme in einem Fräsrad, wobei der zungenförmige Zahnfuß eine umfangseitig umlaufende Haltenut aufweist, und zumindest einer Schneide, welche kopfseitig am Zahnfuß angeordnet ist.The invention relates to a cutting tooth according to the preamble of claim 1. Such a cutting tooth is formed with a tongue-shaped tooth root for receiving in a cutting wheel, wherein the tongue-shaped tooth root has a peripheral circumferential retaining groove, and at least one cutting edge, which is arranged on the tooth base on the head side.

Ein gattungsgemäßer Fräszahn geht aus der EP 1 780 375 A1 hervor. Der Fräszahn ist symmetrisch zu einer Längsebene ausgebildet, welche parallel zu und zwischen den U-förmigen Seitenflächen sowie in Fräsrichtung verläuft. Weitere Fräszähne sind beispielsweise aus der EP 1 780 375 A1 und der EP 0 916 771 A2 bekannt.A generic cutting tooth goes out of the EP 1 780 375 A1 out. The cutting tooth is formed symmetrically to a longitudinal plane, which runs parallel to and between the U-shaped side surfaces and in the milling direction. Other cutting teeth are for example from the EP 1 780 375 A1 and the EP 0 916 771 A2 known.

Die bekannten Fräszähne werden mit ihren Zahnfüßen in Fräszahnhalter eingesteckt, die umfangsseitig am Fräsrad vorgesehen sind. Um den jeweiligen Fräszahn quer zur Fräsrichtung im Fräszahnhalter zu sichern, ist umfangsseitig am Zahnfuß eine umlaufende Haltenut vorgesehen, in welche ein entsprechendes Profil am Fräszahnhalter eingreift. Zum Abarbeiten von Bodenmaterial weisen die Fräszähne Schneiden auf, die am Kopfende des Zahnfußes angeordnet sind.The known milling teeth are inserted with their tooth feet in Fräszahnhalter, which are circumferentially provided on the cutting wheel. In order to secure the respective cutting tooth transversely to the cutting direction in the milling tooth holder, a peripheral retaining groove is provided circumferentially on the tooth root, in which engages a corresponding profile on the Fräszahnhalter. For working off soil material, the cutting teeth on cutting, which are arranged at the top of the tooth root.

Die DE 1 749 015 U , die DE 39 20 011 C3 , die DE 195 47 170 C2 , die GB 714,251 , die GB 2 053 315 A , die US 2,690,904 , die US 4,120,106 , die US 5,810,449 und die EP 1 452 686 A1 beschreiben Zahnanordnungen für Schneideräder, wobei die Schneideräder für wechselnde Drehrichtungen vorgesehen sind. Die Zahnanordnungen weisen bewegliche Elemente auf, deren Position relativ zum Schneiderad bei einem Wechsel der Drehrichtung geändert wird.The DE 1 749 015 U , the DE 39 20 011 C3 , the DE 195 47 170 C2 , the GB 714,251 , the GB 2 053 315 A , the US 2,690,904 , the US 4,120,106 , the US 5,810,449 and the EP 1 452 686 A1 describe tooth arrangements for cutting wheels, wherein the cutting wheels are provided for changing directions of rotation. The tooth arrangements have movable elements whose position is changed relative to the cutting wheel when changing the direction of rotation.

Die US 3,629,964 und die US 3,755,933 beschreiben Meißeleinsätze für die Bodenbearbeitung, welche in unterschiedlichen Positionen montiert werden können.The US 3,629,964 and the US 3,755,933 describe chisel inserts for soil cultivation, which can be mounted in different positions.

Aufgabe der Erfindung ist es, einen gattungsgemäßen Fräszahn so weiterzubilden, dass bei hoher Zuverlässigkeit, hoher Wirtschaftlichkeit und langen Standzeiten besonders vielfältige Einsatzmöglichkeiten gegeben sind. The object of the invention is to develop a generic cutting tooth so that with high reliability, high efficiency and long life particularly versatile applications are given.

Die Aufgabe wird erfindungsgemäß durch einen Fräszahn mit den Merkmalen des Anspruchs 1 gelöst. Bevorzugte Ausführungen sind in den abhängigen Ansprüchen angegeben.The object is achieved by a cutting tooth with the features of claim 1. Preferred embodiments are specified in the dependent claims.

Ein Grundgedanke der Erfindung liegt darin, den Fräszahn spiegelsymmetrisch zu gestalten, so dass sowohl der zungenförmige Zahnfuß als auch die Schneiden zur selben Spiegelebene symmetrisch angeordnet sind. Durch diese erfindungsgemäße Anordnung ist ein Fräszahn mit zumindest zwei gegenüberliegenden Schneiden gegeben, welche in entgegengesetzten Richtungen schneiden. Damit kann der erfindungsgemäße Fräszahn auch bei reversierender Drehrichtung des Fräsrades stets schneidend mit dem anstehenden Boden in Eingriff gebracht werden. Diese Arbeitsweise ist vor allem beim sogenannten "cutter soil mixing" Verfahren interessant, bei dem das abgefräste Bodenmaterial zur Herstellung ausgehärteter Schlitzwandpaneele im Schlitz durch Fräsradwirkung mit einem Bindemittel durchmischt wird. Die reversierende Drehrichtung der Fräsräder erlaubt dabei eine besonders gute Mischung der abbindbaren Suspension. Das abgefräste Bodenmaterial kann dabei durch die wechselnde Drehrichtung der Fräsräder weiter aufgeschlossen und zerkleinert werden.A basic idea of the invention is to make the cutting tooth mirror-symmetrical, so that both the tongue-shaped tooth root and the cutting edges are arranged symmetrically to the same mirror plane. By this arrangement according to the invention, a cutting tooth is provided with at least two opposing cutting edges which intersect in opposite directions. Thus, the cutting tooth according to the invention can always be brought intersecting with the upcoming soil even with reversing direction of rotation of the cutting wheel. This method of operation is of particular interest in the so-called "cutter soil mixing" process, in which the milled soil material for producing hardened diaphragm wall panels in the slot is mixed by a cutting wheel effect with a binder. The reversing direction of rotation of the cutting wheels allows a particularly good mixing of the settable suspension. The milled soil material can be further digested and crushed by the changing direction of rotation of the cutting wheels.

Darüber hinaus ist es mit einem erfindungsgemäßen Fräszahn möglich, bei einseitigem Zahnverschleiß aufgrund gleichbleibender Drehrichtung des Fräsrades den Zahn am Fräsrad umzudrehen, so dass dann die zweite Schneide für den weiteren Betrieb zur Verfügung steht. Hierdurch können die Standzeiten erheblich gesteigert werden. Durch die Verwendung der zweiten Schneide können die Zähne sehr viel länger benutzt werden, was zu einer erheblichen Kosten- und Zeitersparnis führen kann.In addition, it is possible with a cutting tooth according to the invention, in one-sided tooth wear due to the same direction of rotation of the cutting wheel to turn the tooth on the cutting wheel, so that then the second blade is available for further operation. As a result, the service life can be significantly increased. By using the second cutting edge, the teeth can be used much longer, which can lead to considerable cost and time savings.

Unter einem zungenförmigen Zahnfuß kann insbesondere ein in Seitenansicht U-förmiger Zahnfuß und/oder ein Zahnfuß verstanden werden, der in Seitenansicht ein rechteckiges Mittelteil und ein halbkreisförmiges Fußteil aufweist. Die Schneiden sind erfindungsgemäß an der Kopfseite des Zahnfußes angeordnet, welche dem halbkreisförmigen Fußteil abgewandt ist. Bei den erfindungsgemäßen Schneiden handelt es sich zweckmäßigerweise um Hartmetallschneiden.Under a tongue-shaped tooth root can be understood in particular a side view of a U-shaped tooth root and / or a tooth root, which has a rectangular side part and a semicircular foot part in side view. The cutting edges are arranged according to the invention on the head side of the tooth root, which faces away from the semicircular foot part. The cutting edges according to the invention are expediently carbide cutters.

Unter einer Schlitzwandfräse kann insbesondere eine Fräse mit einem Rahmen verstanden werden, an dessen Unterseite Fräsräder angeordnet sind, welche beim vertikalen Absenken des Rahmens in den Boden unterhalb des Rahmens Bodenmaterial abfräsen und dabei einen Schlitz erzeugen können. Zweckmäßigerweise weisen die Fräsräder der Schlitzwandfräse zusammen einen rechteckigen Fräsquerschnitt auf. Insbesondere können zumindest vier Fräsräder vorgesehen sein. Diese vier Fräsräder sind zweckmäßigerweise in Form zweier Fräsradpaare angeordnet, wobei die beiden Fräsräder jedes Fräsradpaares eine gemeinsame Drehachse aufweisen. Die beiden gemeinsamen Drehachsen sind dabei zweckmäßigerweise parallel angeordnet, und vorzugsweise fluchtet jedes der Fräsräder eines Fräsradpaares mit einem Fräsrad des benachbarten Fräsradpaares.Under a trench wall cutter can be understood in particular a milling machine with a frame, on the underside of cutting wheels are arranged, which can milled soil material when vertical lowering of the frame in the ground below the frame and thereby create a slot. Conveniently, the cutting wheels of the trench wall cutter together have a rectangular milling cross section. In particular, at least four cutting wheels can be provided. These four cutting wheels are expediently arranged in the form of two pairs of cutting wheels, the two cutting wheels of each pair of cutting wheels having a common axis of rotation. The two common axes of rotation are expediently arranged in parallel, and preferably each of the cutting wheels of a cutting wheel pair is aligned with a cutting wheel of the adjacent cutting wheel pair.

Nach der Erfindung ist es vorgesehen, dass die Symmetrieebene senkrecht zu einer U-förmigen Seitenfläche des Zahnfußes verläuft. Hierdurch kann eine besonders kompakte und zugleich robuste Zahnanordnung erhalten werden. Die Symmetrieebene verläuft zumindest annähernd senkrecht zu der Fräsrichtung der Schneiden und/oder durch eine Längsachse des Zahnfußes.According to the invention, it is provided that the plane of symmetry is perpendicular to a U-shaped side surface of the tooth root. In this way, a particularly compact and at the same time robust tooth arrangement can be obtained. The plane of symmetry runs at least approximately perpendicular to the cutting direction of the cutting edges and / or through a longitudinal axis of the tooth root.

Zusätzlich oder alternativ kann aber auch eine Symmetrieebene parallel zur U-förmigen Seitenfläche des Zahnfußes vorgesehen sein.Additionally or alternatively, however, a plane of symmetry may also be provided parallel to the U-shaped side surface of the tooth root.

Besonders vorteilhaft ist es somit, dass der Fräszahn spiegelsymmetrisch zu einer weiteren Symmetrieebene ausgebildet ist, welche senkrecht zur zuvor genannten Symmetrieebene verläuft. Hierdurch wird eine besonders gleichmäßige Krafteinleitung und somit eine besonders gute Schneidewirkung ermöglicht.It is thus particularly advantageous that the cutting tooth is formed mirror-symmetrically to a further plane of symmetry, which is perpendicular to the aforementioned plane of symmetry. This allows a particularly uniform application of force and thus a particularly good cutting action.

Im Hinblick auf die Schneidleistung ist es weiter besonders vorteilhaft, dass die Schneiden zumindest bereichsweise polyederförmig ausgebildet sind. Insbesondere kann ein freiliegender Bereich der Schneiden polyederförmig ausgebildet sein.With regard to the cutting performance, it is further particularly advantageous that the cutting edges are at least partially polyhedron-shaped. In particular, an exposed portion of the cutting can be polyhedron-shaped.

Zweckmäßigerweise weisen die Schneiden jeweils zumindest eine Schneidkante auf. An dieser Schneidkante kann die jeweilige Schneide keilförmig ausgebildet sein. Jede Schneide kann auch mehrere Schneidkanten aufweisen. Insbesondere kann vorgesehen sein, dass mehrere Schneidkanten der Schneiden an einer Schneidenspitze zusammenlaufen. Für einen besonders guten Schneidfortschritt ist es vorteilhaft, dass zumindest eine Schneidkante vorgesehen ist, welche zumindest annähernd parallel zur Symmetriefläche verläuft, das heißt die mit der Symmetriefläche einen Winkel < 20° einschließt.Expediently, the cutting edges each have at least one cutting edge. At this cutting edge, the respective cutting edge can be wedge-shaped. Each cutting edge can also have several cutting edges. In particular, it can be provided that a plurality of cutting edges of the cutting converge on a cutting tip. For a particularly good cutting progress, it is advantageous that at least one cutting edge is provided, which extends at least approximately parallel to the surface of symmetry, that is with the symmetry surface forms an angle <20 °.

Besonders bevorzugt ist es, dass der Fräszahn zumindest ein kopfseitiges W-Profil aufweist, welches sich vorzugsweise über beide gegenüberliegend angeordnete Schneiden erstreckt. Gemäß dieser Ausführungsform weist der Fräszahn kopfseitig, insbesondere in Seitenansicht und/oder mit Blickrichtung parallel zur Symmetrieebene, zumindest eine W-förmige Kante auf, welche bereichsweise durch die beiden gegenüberliegenden Schneiden, insbesondere durch Schneidkanten der Schneiden, gebildet wird. Ein solches W-Profil erlaubt eine zuverlässige Befestigung der Schneiden am Zahnfuß. Gleichzeitig kann diese Anordnung einen reversierenden Drehbetrieb des Fräsrads ermöglichen, ohne dass es erforderlich wäre, den Fräszahn beweglich am Fräsrad vorzusehen.It is particularly preferred that the cutting tooth has at least one head-side W-profile, which preferably extends over both oppositely arranged cutting. According to this embodiment, the cutting tooth on the head side, in particular in side view and / or viewing direction parallel to the plane of symmetry, at least one W-shaped edge which is partially formed by the two opposite cutting, in particular by cutting edges of the cutting. Such a W-profile allows a reliable attachment of the cutting edges on the tooth root. At the same time, this arrangement can allow a reversing rotary operation of the cutting wheel, without it being necessary to provide the cutting tooth movable on the cutting wheel.

Eine besonders kompakte und robuste Anordnung ist dadurch gegeben, dass die Symmetrieebene des Fräszahns durch einen mittleren Scheitel des kopfseitigen W-Profils verläuft, und/oder dass die äußeren Schenkel des kopfseitigen W-Profils zumindest bereichsweise durch die Schneiden gebildet werden. Insbesondere können die äußeren Schenkel durch keilförmige Schneidkanten der Schneiden gebildet sein. Die inneren Schenkel des kopfseitigen W-Profils werden zweckmäßigerweise vom Zahnfuß gebildet, insbesondere von keilförmigen Kanten des Zahnfußes.A particularly compact and robust arrangement is given by the fact that the plane of symmetry of the cutting tooth extends through a central vertex of the head-side W-profile, and / or that the outer legs of the head-side W-profile are at least partially formed by the cutting. In particular, the outer legs may be formed by wedge-shaped cutting edges of the blades. The inner legs of the head-side W-profile are expediently formed by the tooth root, in particular of wedge-shaped edges of the tooth root.

Der erfindungsgemäße Fräszahn kann für einen reversierenden Fräsradbetrieb eingesetzt werden, ohne dass er hierzu beweglich am Fräsrad gelagert werden müsste. Es ist somit besonders vorteilhaft, dass die Schneiden unbeweglich am Zahnfuß angeordnet sind, und/oder dass der Zahnfuß unbeweglich am Fräsrad angeordnet ist.The cutting tooth according to the invention can be used for a reversing Fräsradbetrieb without this he would have to be stored on the cutting wheel movable. It is thus particularly advantageous that the cutting edges are arranged immovably on the tooth root, and / or that the tooth root is arranged immovably on the cutting wheel.

Ein Aspekt der Erfindung liegt darin, dass die beiden Schneiden jeweils als Doppelschneiden, insbesondere mit parallelen Schneidkanten, ausgebildet sind. Gemäß einer Ausführungsform weisen die beiden gegenüberliegenden Schneiden jeweils zwei einzelne Schneidelemente auf, welche vorzugsweise verbunden sind. Die Einzelschneiden sind zweckmäßigerweise zumindest bereichsweise polygonartig ausgebildet. Für eine besonders gleichmäßige Krafteinleitung weisen die Doppelschneiden parallele Schneidkanten auf, das heißt zumindest eine der Schneidkanten einer der Einzelschneiden ist parallel zu einer Schneidkante der anderen Einzelschneide der jeweiligen Doppelschneide ausgebildet. Zweckmäßigerweise weisen die Doppelschneiden mehrere parallele Schneidkanten auf.One aspect of the invention is that the two cutting edges are each designed as double cutting edges, in particular with parallel cutting edges. According to one embodiment, the two opposite Each cut two individual cutting elements, which are preferably connected. The individual cutting edges are expediently polygonal-shaped, at least in regions. For a particularly uniform application of force, the double cutting edges have parallel cutting edges, that is to say at least one of the cutting edges of one of the individual cutting edges is formed parallel to a cutting edge of the other individual cutting edge of the respective double cutting edge. The double cutters expediently have a plurality of parallel cutting edges.

Eine besonders robuste Anordnung ist dadurch gegeben, dass die beiden Einzelschneiden einer Doppelschneide benachbart angeordnet sind, vorzugsweise aneinander anliegen. Zweckmäßigerweise sind die Doppelschneiden jeweils einstückig ausgebildet. Die Einzelschneiden können insbesondere keilförmig ausgeführt sein.A particularly robust arrangement is given by the fact that the two individual cutting edges are arranged adjacent to a double cutting edge, preferably abut each other. Conveniently, the double cutting edges are each formed in one piece. The individual cutting edges can in particular be wedge-shaped.

Sofern Doppelschneiden vorgesehen sind, ist es erfindungsgemäß, dass die Doppelschneiden, vorzugsweise zumindest bei Betrachtung senkrecht zur Symmetrieebene, ein W-förmiges Profil aufweisen. Zweckmäßigerweise können die linken Schenkel des W-förmigen Profils dabei von einer ersten Einzelschneide und die rechten Schenkel des W-förmigen Profils von einer zweiten Einzelschneide derselben Doppelschneide gebildet sein. Hierdurch ist eine besonders robuste Anordnung gegeben. Vorzugsweise sind an den außermittigen Scheiteln des W-förmigen Profils Schneidkanten ausgebildet.If double cutting is provided, it is according to the invention that the double cutters, preferably at least when viewed perpendicularly to the plane of symmetry, have a W-shaped profile. Conveniently, the left legs of the W-shaped profile can be formed by a first single cutting edge and the right leg of the W-shaped profile of a second single cutting edge of the same double cutting edge. As a result, a particularly robust arrangement is given. Preferably, cutting edges are formed at the off-center vertices of the W-shaped profile.

Besonders vorteilhaft ist es, dass das W-förmige Profil der Doppelschneiden im Zahnfuß fortgesetzt ist und bevorzugt die Symmetrieebene durchläuft. Gemäß dieser Ausführungsform ist ein W-Profil sowohl im Schnitt der Doppelschneiden als auch im Schnitt des kopfseitigen Zahnfußabschnittes gegeben, welcher die Doppelschneiden verbindet.It is particularly advantageous that the W-shaped profile of the double cutters in the tooth root is continued and preferably passes through the plane of symmetry. According to this embodiment, a W-profile is given both in the section of the double cutters and in the section of the head-side Zahnfußabschnittes, which connects the double cutting edges.

Alternativ oder zusätzlich ist es vorteilhaft, dass die Doppelschneiden bei Betrachtung von oben auf den Zahnkopf und/oder bei Betrachtung parallel zur Symmetrieebene ein W-förmiges Profil aufweisen.Alternatively or additionally, it is advantageous for the double cutters to have a W-shaped profile when viewed from above on the tooth head and / or when viewed parallel to the plane of symmetry.

Die mechanische Belastbarkeit des Fräszahns kann weiter dadurch erhöht werden, dass am Zahnfuß im Bereich der Schneiden zumindest eine pyramidenförmige Schneidenstützstruktur vorgesehen ist. Zweckmäßigerweise weist jede Einzelschneide eine pyramidenförmige Schneidenstützstruktur auf. Geeigneterweise liegt die gestützte Schneide an einer Pyramidenmantelfläche an der Schneidenstützstruktur an. Die Schneidenstützstruktur kann insbesondere die Form einer schiefen Pyramide aufweisen. Insbesondere kann eine Rechteckpyramide, vorzugsweise eine quadratische Pyramide, vorgesehen sein.The mechanical load capacity of the cutting tooth can be further increased by providing at least one pyramid-shaped cutting support structure at the tooth root in the region of the cutting edges. Conveniently, each individual cutting edge has a pyramidal cutting support structure. Suitably lies the supported cutting edge on a pyramid surface on the cutting support structure. The cutting support structure may in particular have the shape of a leaning pyramid. In particular, a rectangular pyramid, preferably a square pyramid, may be provided.

Für eine besonders einfach ausführbare und zugleich zuverlässige Sicherung des Fräszahns an einem Fräszahnhalter ist es besonders vorteilhaft, dass die umfangseitig umlaufende Haltenut einen Dreiecksquerschnitt aufweist. Das korrespondierende Befestigungselement am Fräszahnhalter kann dann ein korrespondierendes Dreiecksprofil aufweisen.For a particularly simple executable and at the same time reliable securing of the cutting tooth to a Fräszahnhalter, it is particularly advantageous that the peripheral circumferential retaining groove has a triangular cross-section. The corresponding fastening element on the milling tooth holder can then have a corresponding triangular profile.

Eine weitere bevorzugte Ausführungsform der Erfindung besteht darin, dass der Zahnfuß zwei spiegelsymmetrisch zur Symmetrieebene angeordnete Haltebohrungen für eine Befestigung des Fräszahns am Fräsrad aufweist. Durch diese Haltebohrungen können Haltebolzen geschoben werden, welche den Zahnfuß am Fräszahnhalter sichern. Insbesondere kann vorgesehen sein, den Fräszahn nur mit einem einzigen Bolzen am Fräszahnhalter zu sichern, welcher durch eine der Haltebohrungen gesteckt wird. Die spiegelsymmetrische Anordnung der beiden Haltebohrungen erlaubt es dabei, den Zahn am Fräszahnhalter umzudrehen und auch bei umgedrehtem Fräszahn dieselbe Bolzenanordnung zu verwenden. Für eine besonders einfache Befestigung können die Haltebohrungen die Haltenut zumindest teilweise durchstoßen. In diesem Fall können die Bolzen im Befestigungselement des Fräsrades, welches mit der Haltenut korrespondiert, gesichert werden.A further preferred embodiment of the invention consists in that the tooth root has two retaining bores arranged mirror-symmetrically to the plane of symmetry for fastening the cutting tooth to the cutting wheel. Through these retaining holes holding bolts can be pushed, which secure the tooth root on the Fräszahnhalter. In particular, it can be provided to secure the cutting tooth only with a single bolt on the cutting tooth holder, which is inserted through one of the retaining holes. The mirror-symmetrical arrangement of the two retaining bores makes it possible to turn the tooth on the cutting tooth holder and to use the same bolt arrangement even when the cutting tooth is reversed. For a particularly simple attachment, the retaining holes can pierce the retaining groove at least partially. In this case, the bolts can be secured in the fastening element of the cutting wheel, which corresponds to the retaining groove.

Weiter ist es vorteilhaft, dass im Zahnfuß eine Werkzeugbohrung für ein Ausziehwerkzeug vorgesehen ist. Über diese Bohrung, in welche beispielsweise ein Ausziehbolzen eingeschoben werden kann, kann eine Kraft auf den Zahnfuß aufgebracht werden, mit welcher der Zahnfuß aus dem entsprechenden Fräszahnhalter gelöst werden kann. Zweckmäßigerweise verläuft die Achse der Werkzeugbohrung in der Symmetrieebene. Hierdurch wird einer unnötigen Schwächung des Zahnfußes durch die Werkzeugbohrung vorgebeugt. Bevorzugt ist die Werkzeugbohrung gegenüber den Haltebohrungen zum Zahnkopf hin versetzt.Furthermore, it is advantageous that a tool bore for a removal tool is provided in the tooth root. About this hole, in which, for example, a Ausziehbolzen can be inserted, a force can be applied to the tooth root, with which the tooth root can be released from the corresponding Fräszahnhalter. Conveniently, the axis of the tool bore extends in the plane of symmetry. As a result, an unnecessary weakening of the tooth root is prevented by the tool bore. Preferably, the tool bore is offset from the holding holes towards the tooth head.

Die Erfindung betrifft auch eine Baumaschine, insbesondere eine Schlitzwandfräse, mit zumindest einem Fräsrad, an welchem zumindest ein Fräszahn nach einem der vorstehenden Ansprüche angeordnet ist.The invention also relates to a construction machine, in particular a trench wall cutter, with at least one cutting wheel on which at least one cutting tooth according to one of the preceding claims is arranged.

Die Erfindung wird nachfolgend anhand eines bevorzugten Ausführungsbeispiels näher erläutert, das schematisch in den beigefügten Figuren dargestellt ist. In den Figuren zeigen:

Fig. 1
eine Seitenansicht,
Fig. 2
eine Frontansicht,
Fig. 3
eine oberseitige Ansicht in Richtung B aus Fig. 1,
Fig. 4
eine Schnittansicht A-A aus Fig. 1,
Fig. 5
eine perspektivische Ansicht von oben, und
Fig. 6
eine perspektivische Ansicht von unten eines Ausführungsbeispiels eines erfindungsgemäßen Fräszahns.
The invention will be explained in more detail below with reference to a preferred embodiment, which is shown schematically in the accompanying figures. In the figures show:
Fig. 1
a side view,
Fig. 2
a front view,
Fig. 3
a top view in the direction of B off Fig. 1 .
Fig. 4
a sectional view AA Fig. 1 .
Fig. 5
a perspective view from above, and
Fig. 6
a perspective view from below of an embodiment of a cutting tooth according to the invention.

Der in den Figuren gezeigte Fräszahn weist einen zungenförmigen Zahnfuß 1 auf, der in Seitenansicht (Fig. 1) U-förmig ausgebildet ist. Der Zahnfuß 1 wird dabei umfangseitig von einer ebenfalls U-förmigen Haltenut 11 umlaufen. Wie insbesondere die Figuren 2 und 4 zeigen, weist diese Haltenut 11 im Querschnitt ein Dreiecksprofil auf, welches sich in den Zahnfuß 1 hinein erstreckt. In der Frontansicht der Fig. 2 wird der Zahnfuß 1 durch zwei parallele Seitenflächen begrenzt, die längs des Zahnfußes von unten nach oben verlaufen.The cutting tooth shown in the figures has a tongue-shaped tooth root 1, which in side view (FIG. Fig. 1 ) Is U-shaped. The tooth base 1 is circumferentially surrounded by a likewise U-shaped retaining groove 11. How the particular FIGS. 2 and 4 show, this retaining groove 11 in cross-section on a triangular profile, which extends into the tooth root 1 inside. In the front view of the Fig. 2 the tooth root 1 is delimited by two parallel side surfaces which run along the tooth root from bottom to top.

An der Kopfseite des Zahnfußes 1, d.h. an der in Figuren 1 und 2 oben dargestellten Seite, welche dem Scheitel des U-Profils des Zahnfußes 1 abgewandt ist, ist auf gegenüberliegenden Zahnfußseiten jeweils eine Schneide 2, 2' angeordnet. Die Schneiden 2, 2' sind jeweils als Doppelschneiden ausgebildet und weisen als solche zwei keilförmige Einzelschneiden auf. In den Figuren sind lediglich die Einzelschneiden 22, 22' der Schneide 2 mit Bezugszeichen versehen. Die zweite Schneide 2' ist analog mit zwei Einzelschneiden ausgebildet.At the top of the tooth base 1, ie at the in Figures 1 and 2 shown above, which faces away from the apex of the U-profile of the tooth root 1, a respective cutting edge 2, 2 'is arranged on opposite Zahnfußseiten. The cutting edges 2, 2 'are each designed as double cutting and, as such, have two wedge-shaped individual cutting edges. In the figures, only the individual cutting edges 22, 22 'of the cutting edge 2 are provided with reference numerals. The second cutting edge 2 'is formed analogously with two individual cutting edges.

Die Einzelschneiden 22, 22' weisen jeweils eine Doppelkeilstruktur mit zwei etwa senkrecht zueinander verlaufenden, ineinander übergehenden Keilen auf, wobei jeder der beiden Keile eine Schneidkante 33 bzw. 34 definiert (Fig. 1). Die seitliche Schneidkante 33 und die obere Schneidekante 34 laufen jeweils in einer Schneidenspitze 35 der zugehörigen Einzelschneide 22 zusammen.The individual cutting edges 22, 22 'each have a double wedge structure with two approximately mutually perpendicular, merging wedges, each of the two wedges defining a cutting edge 33 or 34 ( Fig. 1 ). The lateral cutting edge 33 and the upper cutting edge 34 run together in each case in a cutting tip 35 of the associated individual cutting edge 22.

Seitlich am Zahnfuß 1 sind im Bereich der Schneiden 2, 2' jeweils zwei pyramidenförmige Schneidenstützstrukturen 15 ausgebildet. Jede der Schneidenstützstrukturen 15 stützt jeweils eine der Einzelschneiden 22. Hierbei liegt die jeweilige Einzelschneide 22 an einer Mantelfläche der jeweiligen Schneidenstützstruktur 15 an. Im Bereich der rechteckpyramidenförmigen Strukturen 15 weist der Zahnfuß eine Verjüngung auf, um unnötigem Zahnfußverschleiß vorzubeugen.On the side of the tooth base 1, two pyramidal cutting support structures 15 are formed in each case in the area of the cutting edges 2, 2 '. Each of the cutting support structures 15 supports in each case one of the individual cutting edges 22. In this case, the respective individual cutting edge 22 bears against a lateral surface of the respective cutting support structure 15. In the area of the rectangular pyramidal structures 15, the tooth root has a taper to prevent unnecessary tooth root wear.

Im Zahnfuß sind zwei parallel zueinander verlaufende Haltebohrungen 18, 18' vorgesehen, welche die Haltenut 11 teilweise durchstoßen (Figuren 1 und 2). Darüber hinaus ist am Zahnfuß 1 mittig eine Werkzeugbohrung 19 für ein Ausziehwerkzeug vorgesehen.In the tooth root two mutually parallel retaining bores 18, 18 'are provided, which partially pierce the retaining groove 11 ( Figures 1 and 2 ). In addition, a tool bore 19 for a removal tool is provided on the tooth root 1 in the center.

Der gesamte Fräszahn, einschließlich des Zahnfußes 1, der Schneiden 2, 2', der Haltebohrungen 18, 18' und der Werkzeugbohrung 19, ist spiegelsymmetrisch zu einer ersten Symmetrieebene 71 (Figuren 1 und 4) ausgebildet. Diese Symmetrieebene verläuft in Fig. 1 senkrecht zur Zeichenebene und Fig. 2 parallel zur Zeichenebene vom Zahnkopf zum Zahnfuß. Aufgrund der Spiegelsymmetrie zur Symmetrieebene 71 ist der Fräszahn für einen Fräsbetrieb in entgegengesetzten Fräsrichtungen geeignet (nach links und nach rechts in Fig. 1).The entire cutting tooth, including the tooth root 1, the cutting edges 2, 2 ', the holding bores 18, 18' and the tool bore 19, is mirror-symmetrical to a first plane of symmetry 71 (FIG. FIGS. 1 and 4 ) educated. This plane of symmetry runs in Fig. 1 perpendicular to the drawing plane and Fig. 2 parallel to the plane from the tooth tip to the tooth base. Due to the mirror symmetry to the plane of symmetry 71 of the cutting tooth is suitable for a milling operation in opposite directions of milling (to the left and to the right in Fig. 1 ).

Darüber hinaus ist der Fräszahn auch noch spiegelsymmetrisch zu einer zweiten Symmetrieebene 72 (Figuren 2, 3 und 4) ausgebildet. Die zweite Symmetrieebene 72 verläuft senkrecht zur ersten Symmetrieebene 71 vom Zahnkopf zum Zahnfuß. Im Gegensatz zur ersten Symmetrieebene 71, welche von den Schneiden 2, 2' beabstandet ist, verläuft die zweite Symmetrieebene 72 durch die Schneiden 2, 2' hindurch, und zwar zwischen den beiden Einzelschneiden 22 und 22', parallel zur Zeichenebene der Fig. 1 und senkrecht zur Zeichenebene der Fig. 2.In addition, the cutting tooth is also mirror-symmetrical to a second plane of symmetry 72 (FIG. FIGS. 2, 3 and 4 ) educated. The second plane of symmetry 72 runs perpendicular to the first plane of symmetry 71 from the tooth tip to the tooth root. In contrast to the first plane of symmetry 71, which is spaced from the cutting edges 2, 2 ', the second plane of symmetry 72 extends through the cutting edges 2, 2', between the two individual cutting edges 22 and 22 ', parallel to the drawing plane Fig. 1 and perpendicular to the plane of the Fig. 2 ,

Wie insbesondere in Fig. 1 erkennbar ist, weist der Fräszahn ein kopfseitiges W-Profil 21 auf. Dieses W-Profil wird außenseitig durch die beiden Schneiden 2, 2' und innenseitig durch den Zahnfuß 1 gebildet. Der mittlere Scheitelpunkt des W-Profils 21 liegt in der Symmetrieebene 71. Die äußeren Schenkel des W-Profils werden durch die oberen Schneidkanten 34 der beiden Schneiden 2 bzw. 2' gebildet.As in particular in Fig. 1 can be seen, the cutting tooth on a head-side W-profile 21. This W-profile is formed on the outside by the two cutting edges 2, 2 'and on the inside by the tooth root 1. The middle vertex of the W-profile 21 is located in the plane of symmetry 71. The outer legs of the W-profile are formed by the upper cutting edges 34 of the two blades 2 and 2 '.

Wie insbesondere Fig. 2 zeigt, bilden die beiden Einzelschneiden 22, 22' mit ihren Keilstrukturen in Frontansicht des Fräszahns, also mit Blick in Schneiderichtung der Schneiden 2 (Fig. 2), ein weiteres W-förmiges Profil 29. Dieses umgekehrt W-förmige Profil 29 steht oberseitig am Zahnkopf vor. Die außermittigen Scheitel des W-förmigen Profils 29 werden durch die oberen Schneidkanten 34 gebildet. Wie Fig. 5 zeigt, erstreckt sich dieses umgekehrt W-förmige Profil 29 über die gesamte Kopfseite des Fräszahnes, das heißt das W-förmige Profil 29 ist sowohl im Bereich der Schneiden 2, 2' als auch im kopfseitigen Zahnfußbereich 60, welcher zwischen den Schneiden 2, 2' liegt, gegeben.In particular Fig. 2 shows, form the two individual cutting edges 22, 22 'with their wedge structures in front view of the cutting tooth, so with a view in cutting direction of Cutting 2 ( Fig. 2 ), another W-shaped profile 29. This inverted W-shaped profile 29 protrudes on the top of the tooth head. The off-center vertices of the W-shaped profile 29 are formed by the upper cutting edges 34. As Fig. 5 shows, this inverted W-shaped profile 29 extends over the entire head side of the cutting tooth, that is, the W-shaped profile 29 is both in the area of the cutting edges 2, 2 'and in the head-side Zahnfußbereich 60, which between the cutting edges 2, 2 'lies, given.

Ein weiteres umgekehrt W-förmiges Profil 30 ist in Draufsicht (Fig. 3) gegeben. Dieses Profil 30, welches vorderseitig am Zahnkopf vorsteht, ist durch die zweite Keilform der Doppelkeilstruktur der beiden Einzelschneiden 22, 22' gebildet, das heißt die außermittigen Scheitel des weiteren W-förmigen Profils 30 werden durch die seitlichen Schneidkanten 33 gebildet.Another reverse W-shaped profile 30 is in plan view ( Fig. 3 ). This profile 30, which protrudes on the front side of the tooth head, is formed by the second wedge shape of the double wedge structure of the two individual cutting edges 22, 22 ', that is, the off-center vertex of the other W-shaped profile 30 are formed by the lateral cutting edges 33.

Beim Betrieb wird der Fräszahn in einem nicht dargestellten Fräszahnhalter eines Fräsrades aufgenommen. Dabei greift ein korrespondierendes Profilelement in die Haltenut 11 ein und sichert den Fräszahn am Fräszahnhalter. Zum Festlegen des Fräszahns kann dann ein Haltebolzen in eine der beiden Haltebohrungen 18 oder 18' eingebracht werden. Das Fräsrad wird sodann in Drehung versetzt, wobei die in Fräsrichtung vorauseilende Schneide 2 bzw. 2' anstehendes Bodenmaterial abträgt.During operation, the cutting tooth is received in a cutting tooth holder, not shown, of a cutting wheel. In this case, a corresponding profile element engages in the retaining groove 11 and secures the cutting tooth on the Fräszahnhalter. To set the cutting tooth, a retaining bolt can then be introduced into one of the two retaining bores 18 or 18 '. The cutting wheel is then set in rotation, wherein the cutting edge leading in the cutting direction 2 or 2 'ablates existing soil material.

Claims (11)

  1. Cutting tooth for a trench wall cutter
    - with tongue-shaped tooth base (1) for reception in a cutting wheel, whereby the tooth base (1) has a U-shaped side surfaces and a circumferential side with a surrounding holding groove (11), and
    - one cutter (2), which is arranged at the head-side of the tooth base (1), characterised in
    - that at least two opposite arranged cutters (2, 2') are provided at the head-side of the tooth base (1), .
    - that the cutting tooth with the tooth base (1) and the cutters (2, 2') is designed mirror-symmetrically to a plain of symmetry (71), which runs perpendicular to a U-shaped side surface and at least approximately perpendicular to the cutting direction of the cutters (2, 2'), and
    - that the two cutters (2, 2') are each designed as double cutters, which have a W-shaped profile.
  2. Cutting tooth according to claim 1,
    characterised in
    that the cutting tooth is designed mirror-symmetrically to a further plane of symmetry (72), which runs perpendicular to the plane of symmetry (71).
  3. Cutting tooth according to claim 1,
    characterised in
    that the cutters (2, 2') are designed at least in areas in a polyhedral manner and each have at least one cutting edge (33, 34).
  4. Cutting tooth according to claim 1,
    characterised in
    - that the cutting tooth has at least one head-side W-profile (21), which extends across both opposite arranged cutters (2, 2'),
    - whereby the plane of symmetry (71) of the cutting tooth runs through a center vertex of the head-side W-profile (21), and
    - whereby the outer flanks of the head-side W-profile (21) are formed by the cutters (2, 2').
  5. Cutting tooth according to claim 1,
    characterised in
    that the cutters (2, 2') are arranged immovably on the tooth base (1), and the tooth base (1) is arranged immovably on a cutting wheel.
  6. Cutting tooth according to claim 1,
    characterised in
    that the W-shaped (29) profile of the double cutters (2, 2') is continued in the tooth base (1) and runs through the plane of symmetry (71).
  7. Cutting tooth according to claim 1,
    characterised in
    that on the tooth base (1) in the area of the cutters (2, 2') at least one pyramidal cutter support structure (15) is provided.
  8. Cutting tooth according to claim 1,
    characterised in
    that the circumferentially surrounding holding groove (11) has a triangular cross-section.
  9. Cutting tooth according to claim 1,
    characterised in
    that the tooth base (1) has two holding bores (18, 18') that are arranged mirror-symmetrically to the plane of symmetry (71) for fixing the cutting tooth on the cutting wheel.
  10. Cutting tooth according to claim 1,
    characterised in
    that in the tooth base (1) a tool bore (19) for an extraction tool is provided, whereby the axis of the tool bore (19) runs in the plane of symmetry (71).
  11. Construction machine, in particular trench wall cutter, having at least one cutting wheel on which at least one cutting tooth according to any of the preceding claims.
EP10001172.5A 2009-02-12 2010-02-04 Cutting bit for a slotted wall cutter Active EP2218829B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202009001814U DE202009001814U1 (en) 2009-02-12 2009-02-12 Milling tooth for a trench wall cutter

Publications (3)

Publication Number Publication Date
EP2218829A2 EP2218829A2 (en) 2010-08-18
EP2218829A3 EP2218829A3 (en) 2013-06-12
EP2218829B1 true EP2218829B1 (en) 2014-11-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP10001172.5A Active EP2218829B1 (en) 2009-02-12 2010-02-04 Cutting bit for a slotted wall cutter

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US (1) US8051588B2 (en)
EP (1) EP2218829B1 (en)
KR (1) KR101238671B1 (en)
CN (1) CN101806081B (en)
DE (1) DE202009001814U1 (en)

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KR101753802B1 (en) 2010-09-20 2017-07-04 엘지디스플레이 주식회사 Liquid crystal display device with a built-in touch screen and method for manufacturing the same
EP2687639A1 (en) * 2012-07-18 2014-01-22 BAUER Maschinen GmbH Cutting bit
NO336726B1 (en) 2013-12-27 2015-10-26 Kverneland Group Operations Norway As Protective plate for wear and tear and method of wearing protection of a wear and tear
FI126490B (en) * 2015-10-23 2017-01-13 Allu Finland Oy Interchangeable blade and blade holder for screen crusher work drum
CN110565717A (en) * 2019-09-16 2019-12-13 江苏徐工工程机械研究院有限公司 Milling tooth with pre-crushing function
DE102022129091A1 (en) 2022-11-03 2024-05-08 Heller Tools Gmbh Core bit for rotary hammering or rotary impact use for cutting through reinforcing iron in concrete

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Also Published As

Publication number Publication date
CN101806081A (en) 2010-08-18
EP2218829A3 (en) 2013-06-12
DE202009001814U1 (en) 2009-04-30
CN101806081B (en) 2013-04-10
KR20100092385A (en) 2010-08-20
KR101238671B1 (en) 2013-03-04
EP2218829A2 (en) 2010-08-18
US20100205835A1 (en) 2010-08-19
US8051588B2 (en) 2011-11-08

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