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EP0991848A1 - Chisel arrangement for cutting chisels of a tool holder mounted in a rotating manner - Google Patents

Chisel arrangement for cutting chisels of a tool holder mounted in a rotating manner

Info

Publication number
EP0991848A1
EP0991848A1 EP98929115A EP98929115A EP0991848A1 EP 0991848 A1 EP0991848 A1 EP 0991848A1 EP 98929115 A EP98929115 A EP 98929115A EP 98929115 A EP98929115 A EP 98929115A EP 0991848 A1 EP0991848 A1 EP 0991848A1
Authority
EP
European Patent Office
Prior art keywords
chisel
axis
pivot
tool carrier
arrangement according
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.)
Granted
Application number
EP98929115A
Other languages
German (de)
French (fr)
Other versions
EP0991848B1 (en
Inventor
Gottfried Siebenhofer
Johann Tockner
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.)
Sandvik Mining and Construction GmbH
Original Assignee
Voest Alpine Bergtechnik GmbH
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 Voest Alpine Bergtechnik GmbH filed Critical Voest Alpine Bergtechnik GmbH
Publication of EP0991848A1 publication Critical patent/EP0991848A1/en
Application granted granted Critical
Publication of EP0991848B1 publication Critical patent/EP0991848B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/19—Means for fixing picks or holders
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/19—Means for fixing picks or holders
    • E21C35/191—Means for fixing picks or holders for fixing holders
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/19—Means for fixing picks or holders
    • E21C35/193—Means for fixing picks or holders using bolts as main fixing elements

Definitions

  • the invention relates to a bit arrangement for cutting bits of a rotating tool carrier, such as e.g. a cutting head or a cutting roller, in which the chisel tips are arranged so as to be prematurely inclined in the circumferential and rotational directions of the tool carrier, and the chisel is tiltably mounted while overcoming a spring force.
  • a rotating tool carrier such as e.g. a cutting head or a cutting roller
  • the spherical joint socket defines the position of the swivel axis of the chisel, this swivel axis being behind the engagement of the chisel in the rock with respect to the position of the chisel tip relative to the face in the direction of rotation.
  • EP-Bl-0 200 037 shows and describes a pivotable holder of a cutting bit, in which the bit can be pivoted about a pivot axis between stops in a receiving bore of the bit holder carrying the pivot axis.
  • the chisel holder is located after an initial pivoting of the chisel receiving component to such a stop, and is thus rigidly supported.
  • the pivotability of the component receiving the chisel serves to actuate a valve, the actuation of the valve taking place against the force of a spring which, in turn, is intended to lift the component receiving the chisel from the valve tappet after exiting the rock.
  • reaction forces are not supported by such a spring, the pivot axis being internal in the embodiment selected in EP-B1-0 200 037. is half the radial projection of the chisel tip on the tool carrier. The chisel is pivoted into the rock during active intervention so that it cannot detach itself from the rock contact.
  • the invention now aims to provide a chisel arrangement of the type mentioned at the outset, with which it is possible above all that the chisel can move away from the rock when it engages in the rock to be cut.
  • the task according to the invention consists essentially in the fact that the tilting axis of the chisel in the circumferential or rotational direction of the chisel is arranged on the tool carrier's rotation axis before the normal projection of the chisel tip onto the axis of rotation of the tool carrier and that the chisel is in the engagement position against a spring is supported tiltable.
  • the tilt axis is arranged at a distance ahead on the tool carrier, which lies in front of the line connecting the cutting axis to the bit tip, creates the possibility of safely detaching from the rock contact, it being further essential that the bit engages in the Rock and thus is tiltably supported in the engagement position against a spring.
  • the chisel should thus be able to be tilted further against the force of a spring in the engagement position, in order in this way to improve the balance of forces and to intercept occurring force peaks.
  • the design according to the invention is so made that the chisel holder is fixed to a one-armed pivot lever, the end of which faces away from the pivot axis is pressed against a spring element.
  • the pressing of the end of the pivot lever facing away from the pivot axis against a spring element is of essential importance in the operating position for the absorption of the forces on the chisel engagement.
  • the swivel lever should be pressed against the spring element under a defined pretension and it therefore corresponds to a preferred development of the chisel arrangement according to the invention that the pressing force of the swivel lever against the spring element is adjustable. One just closing a valve after removing The spring force assuring the chisel is in no way suitable for absorbing such reaction forces.
  • Secure support and particularly good power absorption can be achieved in that the longitudinal axis of the pivot lever is articulated at an acute angle of less than 35 °, in particular less than 25 °, to the tangent to the tool carrier in the region of the pivot axis, such an arrangement of the pivot lever the corresponding leverage ensures, which is advantageous for a secure resilient support of the dynamic passive forces.
  • the spring element must also be resilient in the engagement position and must therefore be able to absorb high reaction forces.
  • the design is therefore advantageously made such that the spring element is formed by a leaf spring or a leaf spring assembly, the longer axis of which is fixed approximately parallel to the pivot axis of the pivot lever on the tool carrier, as a result of which high spring forces and thus high force peaks can be absorbed in a small space.
  • a particularly good introduction of force to absorb the cutting forces can be achieved in that the distance (a) of the swivel axis from the normal projection of the chisel tip onto the chisel holder is at least one third, preferably at least half, of the normal distance of the swivel axis from the face or the cutting track plane of the Chisel.
  • Such a design allows the desired pivoting against the force of a spring with effective absorption of the cutting forces, for which purpose the design is advantageously made such that the distance of the contact point or contact center of the pivot lever on the spring element from the pivot axis is greater than the distance (a) the swivel axis from the normal projection of the chisel tip onto the chisel holder.
  • the cutting forces are introduced into the spring element via a correspondingly long lever arm, so that they are small and stiff Feathers that can be found.
  • the reaction forces are introduced into the spring at a greater distance than the distance between the line of action of the passive forces and the swivel axis.
  • a particularly simple adjustability of the desired spring preload for the effective support of the forces mentioned can be achieved in that the pivot lever is pressed against the spring element by a clamping bolt passing through the pivot lever between the pivot axis and the contact point.
  • the articulation geometry of the chisel arrangement is advantageously chosen according to the invention in such a way that the resilient support of the pivot lever in the operating position of the chisel is selected so that the cutting forces which become effective are reduced.
  • FIG. 1 shows a side view of a pivotable chisel holder on the tool carrier and
  • FIG. 2 shows a top view of the arrangement according to FIG. 1.
  • FIG. 1 shows a cutting chisel 1 which is received in a chisel holder 2.
  • the chisel can be received in the chisel holder 2 in a conventional manner and in particular in a manner rotatable about the chisel axis 3 in order to minimize wear.
  • the cutting reaction force is indicated by arrow 4, which is the direction of the resulting one.
  • This resulting cutting reaction force is composed of a passive force, the vector of which is 5 and a circumferential force of which the vector is indicated by 6.
  • the line of action of the passive force, which is directed toward the center of the rotational movement of the tool carrier 7, is designated by 8, the axis of rotation of the tool carrier 7 being indicated by 9.
  • the chisel holder 2 is mounted on a one-armed pivot lever 10 so that it can pivot about the pivot axis 11, the pivot axis 11 being arranged in a bearing component 12 which is connected to the tool carrier 7.
  • the pivoting of the pivot lever 10 about the pivot axis 11 takes place against a spring element 13 which is designed as a leaf spring and is likewise fixed on the tool carrier 7 in a corresponding spring holder 14.
  • the bias of the pivot lever 10 against the spring element 13 is adjusted accordingly by means of a bolt 15 and nuts 16.
  • the distance a of the pivot axis from the line of action of the cutting normal force of the cutting reaction forces is chosen so that the bit 1 and the bit holder 2 can move against the spring element 13 during operation and force peaks can be compensated in this way.
  • the free end of the pivot lever 10 rests on the spring element 13 and is pressed against this spring element 13 under prestress.
  • the forces are introduced into the spring element 13 at a greater distance from the pivot axis 11 than the distance a between the line of action of the cutting normal force and the pivot axis.
  • the lever arm length over which the reaction forces are derived in the spring element 13 is indicated with b.
  • the pivot axis 11 is furthermore at a distance c from the cutting track, the desired reduction in the force peaks being obtained by a suitable choice of these three distances.
  • Fig. 2 it can be seen that the longitudinal axis 17 of the leaf spring 13 is arranged substantially parallel to the pivot axis 11 on the tool holder schematically indicated by 7.
  • the tool holder itself forms part of the circumference of a cutting head or a cutting roller and is naturally idealized in the representations according to FIGS. 1 and 2.
  • the kinematics of the articulation is such that the longitudinal axis 18 of the pivoting lever 10 with the tangent to the tool carrier 7 has an acute angle ⁇ of approximately 20 °, in FIG. 1 one to this tangent parallel line is entered.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Turning (AREA)
  • Earth Drilling (AREA)

Abstract

The invention relates to a chisel arrangement for the cutting chisels of a tool holder mounted in a rotating manner, such as a cutter head or cutting rollers, in which the chisel tips are inclined in a leading manner in the direction of rotation and the direction of circumference of the tool holder and the chisel can be tilted by overcoming a spring force. The tilt axis of the chisel (1) is positioned on the tool holder (7) in the direction of the circumference and rotation of the chisel (1) in front of the projection of the chisel tip towards the axis of rotation (9) of the tool holder (7). In the contact position, the chisel (1) is supported against a spring (3) in a tiltable manner.

Description

Meißelanordnung für Schneidmeißel eines rotierend gelagerten WerkzeugträgersChisel arrangement for cutting chisels of a rotating tool carrier
Die Erfindung bezieht sich auf eine Meißelanordnung für Schneidmeißel eines rotierend gelagerten Werkzeugträgers, wie z.B. eines Schneidkopfes oder einer Schneidwalze, bei welcher die Meißelspitzen in Umfangs- und Drehrichtung des Werkzeugträgers voreilend geneigt angeordnet sind und der Meißel unter Überwindung einer Federkraft kippbar gelagert ist.The invention relates to a bit arrangement for cutting bits of a rotating tool carrier, such as e.g. a cutting head or a cutting roller, in which the chisel tips are arranged so as to be prematurely inclined in the circumferential and rotational directions of the tool carrier, and the chisel is tiltably mounted while overcoming a spring force.
Aus der DE-C-34 41 950 ist es bekannt, einen Schneidmeißel schwenkbar in einem Meißelhalter anzuordnen, wobei der Meißel im Meißelhalter unter dem Einfluß der Schneidreaktionskräfte verkippbar ist und in seine ursprüngliche Lage durch eine Rückstellfeder zurückstellbar ist. Der Meißelschaftaufnahmebauteil ist hiebei in eine Kugelgelenkpfanne des Meißelhalters eingesetzt, wodurch sich eine durch die Bohrung des Meißelhalters beschränkte Verschwenkbarkeit bzw. Kippbarkeit des Meißels ergibt. Die Kugelgelenkpfanne definiert die Position der Schwenkachse des Meißels, wobei diese Schwenkachse mit Rücksicht auf die Anstellung der Meißelspitze relativ zur Ortsbrust in Drehrichtung hinter dem Eingriff des Meißels in das Gestein liegt .From DE-C-34 41 950 it is known to pivotally arrange a cutting chisel in a chisel holder, the chisel in the chisel holder being tiltable under the influence of the cutting reaction forces and being able to be returned to its original position by a return spring. The chisel shank receiving component is inserted into a ball joint socket of the chisel holder, which results in a pivotability or tiltability of the chisel which is restricted by the bore of the chisel holder. The spherical joint socket defines the position of the swivel axis of the chisel, this swivel axis being behind the engagement of the chisel in the rock with respect to the position of the chisel tip relative to the face in the direction of rotation.
Die EP-Bl-0 200 037 zeigt und beschreibt eine schwenkbare Halte- rung eines Schneidmeißels, bei welcher der Meißel um eine Schwenkachse zwischen Anschlägen in einer Aufnahmebohrung des die Schwenkachse tragenden Meißelhalters verschwenkbar ist . ' Im Betrieb liegt der Meißelhalter nach einem anfänglichen Verschwenken des den Meißel aufnehmenden Bauteiles an einem derartigen Anschlag an und ist somit starr abgestützt. Die Schwenkbarkeit des den Meißel aufnehmenden Bauteiles dient hiebei dazu, ein Ventil zu betätigen, wobei die Betätigung des Ventiles entgegen der Kraft einer Feder erfolgt, welche den den Meißel aufnehmenden Bauteil nach dem Austritt aus dem Gestein wiederum vom Ventilstößel abheben soll. Eine Abstützung der Reaktionskräfte erfolgt durch eine derartige Feder nicht, wobei die Schwenkachse bei der in der EP-B1-0 200 037 gewählten Ausführungsform inner- halb der radialen Projektion der Meißelspitze auf den Werkzeugträger liegt. Der Meißel wird bei aktivem Eingriff in das Gestein verschwenkt, sodaß er sich nicht vom Gesteinskontakt lösen kann.EP-Bl-0 200 037 shows and describes a pivotable holder of a cutting bit, in which the bit can be pivoted about a pivot axis between stops in a receiving bore of the bit holder carrying the pivot axis. 'In operation, the chisel holder is located after an initial pivoting of the chisel receiving component to such a stop, and is thus rigidly supported. The pivotability of the component receiving the chisel serves to actuate a valve, the actuation of the valve taking place against the force of a spring which, in turn, is intended to lift the component receiving the chisel from the valve tappet after exiting the rock. The reaction forces are not supported by such a spring, the pivot axis being internal in the embodiment selected in EP-B1-0 200 037. is half the radial projection of the chisel tip on the tool carrier. The chisel is pivoted into the rock during active intervention so that it cannot detach itself from the rock contact.
Die Erfindung zielt nun darauf ab, eine Meißelanordnung der eingangs genannten Art zu schaffen, mit welcher es vor allem gelingt, daß sich der Meißel beim Eingriff in das zu schneidende Gestein aus dem Gestein weg bewegen kann. Zur Lösung dieser Aufgabe besteht die erfindungsgemäße Aufgabe im wesentlichen darin, daß die Kippachse des Meißels in Umfangs- bzw. Drehrichtung des Meißels vor der Normalprojektion der Meißelspitze auf die Rotationsachse des Werkzeugträgers auf dem Werkzeugträger angeordnet ist und daß der Meißel in der Eingriffslage gegen eine Feder kippbar abgestützt ist. Dadurch, daß die Kippachse in einem Abstand voreilend auf dem Werkzeugträger angeordnet ist, welcher vor der Verbindungslinie der Schrämkopfachse zur Meißelspitze liegt, wird die Möglichkeit geschaffen, sich sicher vom Gesteinskontakt zu lösen, wobei es weiters wesentlich ist, daß der Meißel im Eingriff in das Gestein und somit in der Eingriffslage gegen eine Feder kippbar abgestützt ist. Der Meißel soll somit in der Eingriffslage noch entgegen der Kraft einer Feder weiter kippbar sein, um auf diese Weise die Kräfteverhältnisse zu verbessern und damit auftretende Kraftspitzen abzufangen.The invention now aims to provide a chisel arrangement of the type mentioned at the outset, with which it is possible above all that the chisel can move away from the rock when it engages in the rock to be cut. To achieve this object, the task according to the invention consists essentially in the fact that the tilting axis of the chisel in the circumferential or rotational direction of the chisel is arranged on the tool carrier's rotation axis before the normal projection of the chisel tip onto the axis of rotation of the tool carrier and that the chisel is in the engagement position against a spring is supported tiltable. The fact that the tilt axis is arranged at a distance ahead on the tool carrier, which lies in front of the line connecting the cutting axis to the bit tip, creates the possibility of safely detaching from the rock contact, it being further essential that the bit engages in the Rock and thus is tiltably supported in the engagement position against a spring. The chisel should thus be able to be tilted further against the force of a spring in the engagement position, in order in this way to improve the balance of forces and to intercept occurring force peaks.
In vorteilhafter Weise ist die erfindungsgemäße Ausbildung hiebei so getroffen, daß der Meißelhalter an einem einarmigen Schwenkhebel festgelegt ist, dessen der Schwenkachse abgewandtes Ende gegen ein Federelement gepreßt ist. Die Anpreßung des der Schwenkachse abgewandten Endes des Schwenkhebels gegen ein Federelement ist in der Betriebslage von wesentlicher Bedeutung für die Aufnahme der Kräfte am Meißeleingriff. Der Schwenkhebel soll hiebei unter einer definierten Vorspannung gegen das Federelement gepreßt sein und es entspricht daher einer bevorzugten Weiterbildung der erfindungsgemäßen Meißelanordnung, daß die Anpreßkraft des Schwenkhebels gegen das Federelement einstellbar ist. Eine lediglich das Schließen eines Ventiles nach dem Aus- tritt des Meißels sicherstellende Federkraft ist für die Aufnahme derartiger Reaktionskräfte in keiner Weise geeignet.Advantageously, the design according to the invention is so made that the chisel holder is fixed to a one-armed pivot lever, the end of which faces away from the pivot axis is pressed against a spring element. The pressing of the end of the pivot lever facing away from the pivot axis against a spring element is of essential importance in the operating position for the absorption of the forces on the chisel engagement. The swivel lever should be pressed against the spring element under a defined pretension and it therefore corresponds to a preferred development of the chisel arrangement according to the invention that the pressing force of the swivel lever against the spring element is adjustable. One just closing a valve after removing The spring force assuring the chisel is in no way suitable for absorbing such reaction forces.
Eine sichere Abstützung und eine besonders gute Kraftaufnahme läßt sich dadurch erzielen, daß die Längsachse des Schwenkhebels unter einem spitzen Winkel von kleiner 35°, insbesondere kleiner 25°, zur Tangente an den Werkzeugträger im Bereich der Schwenkachse angelenkt ist, wobei eine derartige Anordnung des Schwenkhebels die entsprechende Hebelübersetzung sicherstellt, welche zu einer sicheren federnden Abstützung der dynamischen Passivkräfte vorteilhaft ist.Secure support and particularly good power absorption can be achieved in that the longitudinal axis of the pivot lever is articulated at an acute angle of less than 35 °, in particular less than 25 °, to the tangent to the tool carrier in the region of the pivot axis, such an arrangement of the pivot lever the corresponding leverage ensures, which is advantageous for a secure resilient support of the dynamic passive forces.
Das Federelement muß, wie bereits erwähnt, auch in der Eingriffslage noch federnd nachgiebig sein und daher in der Lage sein, hohe Reaktionskräfte aufzunehmen. Mit Vorteil ist daher die Ausbildung so getroffen, daß das Federelement von einer Blattfeder oder einem Blattfederpaket gebildet ist, deren längere Achse zur Schwenkachse des Schwenkhebels etwa parallel am Werkzeugträger festgelegt ist, wodurch bei geringem Platzaufwand auch hohe Federkräfte und damit hohe Kraftspitzen aufgenommen werden können.As already mentioned, the spring element must also be resilient in the engagement position and must therefore be able to absorb high reaction forces. The design is therefore advantageously made such that the spring element is formed by a leaf spring or a leaf spring assembly, the longer axis of which is fixed approximately parallel to the pivot axis of the pivot lever on the tool carrier, as a result of which high spring forces and thus high force peaks can be absorbed in a small space.
Eine besonders gute Krafteinleitung zur Aufnahme der Schneidkräfte läßt sich dadurch erzielen, daß der Abstand (a) der Schwenkachse von der Normalprojektion der Meißelspitze auf den Meißelhalter wenigstens einem Drittel, vorzugsweise wenigstens der Hälfte, des Normalabstandes der Schwenkachse von der Ortsbrust bzw. der Schneidspurebene des Meißels beträgt. Eine derartige Ausbildung erlaubt die gewünschte Verschwenkung entgegen der Kraft einer Feder unter wirkungsvoller Aufnahme der Schneidkräfte, wofür mit Vorteil die Ausbildung so getroffen ist, daß der Abstand des Anpreßpunktes bzw. Anpreßmittelpunktes des Schwenkhebels am Federelement von der Schwenkachse größer ist als der Abstand (a) der Schwenkachse von der Normalprojektion der Meißelspitze auf den Meißelhalter. Auf diese Weise werden die Schneidkräfte über einen entsprechend langen Hebelarm in das Federelement eingeleitet, sodaß mit kleinbauenden und steifen Federn das Auslangen gefunden werden kann. Die Einleitung der Reaktionskräfte in die Feder erfolgt hiebei in einem größeren Abstand als dem Abstand der Wirklinie der Passivkräfte von der Schwenkachse .A particularly good introduction of force to absorb the cutting forces can be achieved in that the distance (a) of the swivel axis from the normal projection of the chisel tip onto the chisel holder is at least one third, preferably at least half, of the normal distance of the swivel axis from the face or the cutting track plane of the Chisel. Such a design allows the desired pivoting against the force of a spring with effective absorption of the cutting forces, for which purpose the design is advantageously made such that the distance of the contact point or contact center of the pivot lever on the spring element from the pivot axis is greater than the distance (a) the swivel axis from the normal projection of the chisel tip onto the chisel holder. In this way, the cutting forces are introduced into the spring element via a correspondingly long lever arm, so that they are small and stiff Feathers that can be found. The reaction forces are introduced into the spring at a greater distance than the distance between the line of action of the passive forces and the swivel axis.
Eine besonders einfache Einstellbarkeit der gewünschten Federvorspannung für die wirksame Abstützung der genannten Kräfte läßt sich dadurch verwirklichen, daß der Schwenkhebel durch einen den Schwenkhebel zwischen Schwenkachse und Anpreßpunkt durchsetzenden Spannbolzen gegen das Federelement angepreßt ist.A particularly simple adjustability of the desired spring preload for the effective support of the forces mentioned can be achieved in that the pivot lever is pressed against the spring element by a clamping bolt passing through the pivot lever between the pivot axis and the contact point.
Die Anlenkgeometrie der Meißelanordnung wird erfindungsgemäß mit Vorteil so gewählt, daß die federnde Abstützung des Schwenkhebels in der Betriebslage des Meißels so gewählt ist, daß die wirksam werdenden Schneidkräfte verringert werden.The articulation geometry of the chisel arrangement is advantageously chosen according to the invention in such a way that the resilient support of the pivot lever in the operating position of the chisel is selected so that the cutting forces which become effective are reduced.
Die erfindungsgemäße Meißelanordnung ist nachfolgend anhand eines in der Zeichnung schematisch dargestellten Ausführungsbei- spieles näher erläutert. In dieser zeigen Fig. 1 eine Seitenansicht eines schwenkbaren Meißelhalters am Werkzeugträger und Fig. 2 eine Draufsicht auf die Anordnung nach Fig. 1.The chisel arrangement according to the invention is explained in more detail below on the basis of an exemplary embodiment shown schematically in the drawing. 1 shows a side view of a pivotable chisel holder on the tool carrier and FIG. 2 shows a top view of the arrangement according to FIG. 1.
In Fig. 1 ist ein Schneidmeißel 1 dargestellt, welcher in einem Meißelhalter 2 aufgenommen ist. Die Aufnahme des Meißels im Meißelhalter 2 kann in konventioneller Weise und insbesondere in um die Meißelachse 3 rotierbarer Weise erfolgen, um den Verschleiß zu minimieren.1 shows a cutting chisel 1 which is received in a chisel holder 2. The chisel can be received in the chisel holder 2 in a conventional manner and in particular in a manner rotatable about the chisel axis 3 in order to minimize wear.
Die Schneidreaktionskraft wird durch den Pfeil 4, welcher der Richtung der resultierenden der. Schneidkräfte entspricht, schematisch angedeutet. Diese resultierende Schneidreaktionskraft setzt sich zusammen aus einer Passivkraft, deren Vektor mit 5 und einer Umfangskraft , deren Vektor mit 6 angedeutet ist. Die Wirklinie der Passivkraft, welche zum Zentrum der Rotationsbewegung des Werkzeugträgers 7 gerichtet ist, ist mit 8 bezeichnet, wobei die Rotationsachse des Werkzeugträgers 7 mit 9 angedeutet ist. Der Meißelhalter 2 ist auf einem einarmigen Schwenkhebel 10 um die Schwenkachse 11 schwenkbar gelagert, wobei die Schwenkachse 11 in einem Lagerbauteil 12 angeordnet ist, welcher mit dem Werkzeugträger 7 verbunden ist. Die Verschwenkung des Schwenkhebels 10 um die Schwenkachse 11 erfolgt gegen ein Federelement 13, welches als Blattfeder ausgebildet ist und gleichfalls am Werkzeugträger 7 in einer entsprechenden Federaufnahme 14 festgelegt ist. Die Vorspannung des Schwenkhebels 10 gegen das Federelement 13 wird über einen Bolzen 15 und Muttern 16 entsprechend eingestellt.The cutting reaction force is indicated by arrow 4, which is the direction of the resulting one. Corresponds to cutting forces, indicated schematically. This resulting cutting reaction force is composed of a passive force, the vector of which is 5 and a circumferential force of which the vector is indicated by 6. The line of action of the passive force, which is directed toward the center of the rotational movement of the tool carrier 7, is designated by 8, the axis of rotation of the tool carrier 7 being indicated by 9. The chisel holder 2 is mounted on a one-armed pivot lever 10 so that it can pivot about the pivot axis 11, the pivot axis 11 being arranged in a bearing component 12 which is connected to the tool carrier 7. The pivoting of the pivot lever 10 about the pivot axis 11 takes place against a spring element 13 which is designed as a leaf spring and is likewise fixed on the tool carrier 7 in a corresponding spring holder 14. The bias of the pivot lever 10 against the spring element 13 is adjusted accordingly by means of a bolt 15 and nuts 16.
Der Abstand a der Schwenkachse von der Wirklinie der Schneidnormalkraft der Schneidreaktionskräfte ist hiebei so gewählt, daß im Betrieb der Meißel 1 und der Meißelhalter 2 gegen das Federelement 13 ausweichen kann und auf diese Weise Kraftspitzen kompensiert werden können.The distance a of the pivot axis from the line of action of the cutting normal force of the cutting reaction forces is chosen so that the bit 1 and the bit holder 2 can move against the spring element 13 during operation and force peaks can be compensated in this way.
Das freie Ende des Schwenkhebels 10 liegt am Federelement 13 auf und ist unter Vorspannung gegen dieses Federelement 13 gepreßt. Die Kräfte werden hiebei auf einem größeren Abstand von der Schwenkachse 11 in das Federelement 13 eingeleitet als dem Abstand a zwischen Wirklinie der Schneidnormalkraft und Schwenkachse. Die Hebelarmlänge, über welche die Reaktionskräfte in das Federelement 13 abgeleitet werden, ist hiebei mit b angedeutet.The free end of the pivot lever 10 rests on the spring element 13 and is pressed against this spring element 13 under prestress. The forces are introduced into the spring element 13 at a greater distance from the pivot axis 11 than the distance a between the line of action of the cutting normal force and the pivot axis. The lever arm length over which the reaction forces are derived in the spring element 13 is indicated with b.
Die Schwenkachse 11 befindet sich darüberhinaus in einem Abstand c von der Schneidspur, wobei sich durch geeignete Wahl dieser drei Abstände die gewünschte Verminderung der Kraftspitzen ergibt .The pivot axis 11 is furthermore at a distance c from the cutting track, the desired reduction in the force peaks being obtained by a suitable choice of these three distances.
In Fig. 2 ist ersichtlich, daß die Längsachse 17 der Blattfeder 13 im wesentlichen parallel zur Schwenkachse 11 am schematisch mit 7 angedeuteten Werkzeugträger angeordnet ist. Der Werkzeugträger selbst bildet einen Teil des Umfanges eines Schrämkopfes oder einer Schrämwalze und ist naturgemäß in den Darstellungen nach Fig. 1 und 2 idealisiert dargestellt. Die Kinematik der Anlenkung ist hiebei, wie aus Fig. 1 ersichtlich, so getroffen, daß die Längsachse 18 des Schwenkhebels 10 mit der Tangente an den Werkzeugträger 7 einen spitzen Winkel α von etwa 20° aufweist, wobei in Fig. 1 eine zu dieser Tangente parallele Linie eingetragen ist. In Fig. 2 it can be seen that the longitudinal axis 17 of the leaf spring 13 is arranged substantially parallel to the pivot axis 11 on the tool holder schematically indicated by 7. The tool holder itself forms part of the circumference of a cutting head or a cutting roller and is naturally idealized in the representations according to FIGS. 1 and 2. 1, the kinematics of the articulation is such that the longitudinal axis 18 of the pivoting lever 10 with the tangent to the tool carrier 7 has an acute angle α of approximately 20 °, in FIG. 1 one to this tangent parallel line is entered.

Claims

Patentansprüche : Claims:
1. Meißelanordnung für Schneidmeißel eines rotierend gelagerten Werkzeugträgers, wie z.B. eines Schneidkopfes oder einer Schneidwalze, bei welcher die Meißelspitzen in Umfangs- und Drehrichtung des Werkzeugträgers voreilend geneigt angeordnet sind und der Meißel unter Überwindung einer Federkraft kippbar gelagert ist, dadurch gekennzeichnet, daß die Kippachse des Meißels (1) in Umfangs- bzw. Drehrichtung des Meißels (1) vor der Normalprojektion der Meißelspitze auf die Rotationsachse (9) des Werkzeugträgers (7) auf dem Werkzeugträger (7) angeordnet ist und daß der Meißel (1) in der Eingriffslage gegen eine Feder1. Chisel arrangement for cutting chisels of a rotating tool carrier, such as a cutting head or a cutting roller, in which the chisel tips are arranged so as to be prematurely inclined in the circumferential and rotational directions of the tool carrier, and the chisel is tiltably mounted while overcoming a spring force, characterized in that the tilting axis of the chisel (1) in the circumferential or rotational direction of the Chisel (1) is arranged on the tool carrier (7) before the normal projection of the chisel tip onto the axis of rotation (9) of the tool carrier (7) and that the chisel (1) is in the engagement position against a spring
(13) kippbar abgestützt ist.(13) is supported tiltably.
2. Meißelanordnung nach Anspruch 1, dadurch gekennzeichnet, daß der Meißelhalter (2) an einem einarmigen Schwenkhebel (10) festgelegt ist, dessen der Schwenkachse (11) abgewandtes Ende gegen ein Federelement gepreßt ist.2. Chisel arrangement according to claim 1, characterized in that the chisel holder (2) on a one-armed pivot lever (10) is fixed, the pivot axis (11) facing end is pressed against a spring element.
3. Meißelanordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Anpreßkraft des Schwenkhebels (10) gegen das Federelement (13) einstellbar ist.3. Chisel arrangement according to claim 1 or 2, characterized in that the contact pressure of the pivot lever (10) against the spring element (13) is adjustable.
4. Meißelanordnung nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Längsachse (18) des Schwenkhebels (10) unter einem spitzen Winkel von kleiner 35°, insbesondere kleiner 25°, zur Tangente an den Werkzeugträger (7) im Bereich der Schwenkachse (11) angelenkt ist.4. Chisel arrangement according to claim 1, 2 or 3, characterized in that the longitudinal axis (18) of the pivot lever (10) at an acute angle of less than 35 °, in particular less than 25 °, to the tangent to the tool carrier (7) in the region of Swivel axis (11) is articulated.
5. Meißelanordnung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Federelement (13) von einer Blattfeder oder einem Blattfederpaket gebildet ist, deren längere Achse (17) zur Schwenkachse (11) des Schwenkhebels (10) etwa parallel am Werkzeugträger (7) festgelegt ist.5. Chisel arrangement according to one of claims 1 to 4, characterized in that the spring element (13) is formed by a leaf spring or a leaf spring assembly, the longer axis (17) to the pivot axis (11) of the pivot lever (10) approximately parallel to the tool carrier ( 7) is set.
6. Meißelanordnung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Abstand (a) der Schwenkachse (11) von der Normalprojektion der Meißelspitze auf den Meißelhalter (7) wenigstens einem Drittel, vorzugsweise wenigstens der Hälfte, des Normalabstandes der Schwenkachse (11) von der Ortsbrust bzw. der Schneidspurebene des Meißels (1) beträgt.6. Chisel arrangement according to one of claims 1 to 5, characterized in that the distance (a) from the pivot axis (11) the normal projection of the chisel tip onto the chisel holder (7) is at least one third, preferably at least half, of the normal distance of the pivot axis (11) from the face or the cutting track plane of the chisel (1).
7. Meißelanordnung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Abstand des Anpreßpunktes bzw. Anpreßmittelpunktes des Schwenkhebels (10) am Federelement (13) von der Schwenkachse (11) größer ist als der Abstand (a) der Schwenkachse von der Normalprojektion der Meißelspitze auf den Meißelhalter (2) .7. Chisel arrangement according to one of claims 1 to 6, characterized in that the distance of the contact point or contact center of the pivot lever (10) on the spring element (13) from the pivot axis (11) is greater than the distance (a) of the pivot axis from the Normal projection of the chisel tip onto the chisel holder (2).
8. Meißelanordnung nach einem der Ansprüche 1 bis 7 , dadurch gekennzeichnet, daß der Schwenkhebel (10) durch einen den Schwenkhebel (10) zwischen Schwenkachse (11) und Anpreßpunkt durchsetzenden Spannbolzen (15) gegen das Federelement (13) angepreßt ist . 8. Chisel arrangement according to one of claims 1 to 7, characterized in that the pivot lever (10) is pressed against the spring element (13) by a pivot bolt (15) passing through the pivot lever (10) between the pivot axis (11) and contact point.
EP98929115A 1997-06-25 1998-06-22 Chisel arrangement for cutting chisels of a tool holder mounted in a rotating manner Expired - Lifetime EP0991848B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT109897 1997-06-25
AT0109897A AT408017B (en) 1997-06-25 1997-06-25 CHISEL ARRANGEMENT FOR CUTTING CHISELS OF A ROTATING BEARING TOOL HOLDER
PCT/AT1998/000156 WO1999000580A1 (en) 1997-06-25 1998-06-22 Chisel arrangement for cutting chisels of a tool holder mounted in a rotating manner

Publications (2)

Publication Number Publication Date
EP0991848A1 true EP0991848A1 (en) 2000-04-12
EP0991848B1 EP0991848B1 (en) 2002-02-06

Family

ID=3506551

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98929115A Expired - Lifetime EP0991848B1 (en) 1997-06-25 1998-06-22 Chisel arrangement for cutting chisels of a tool holder mounted in a rotating manner

Country Status (6)

Country Link
EP (1) EP0991848B1 (en)
AT (2) AT408017B (en)
AU (1) AU7897698A (en)
DE (1) DE59803023D1 (en)
WO (1) WO1999000580A1 (en)
ZA (1) ZA985311B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19908656C1 (en) * 1999-02-27 2000-08-31 Wirtgen Gmbh Chisel holder changing system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3697137A (en) * 1969-12-15 1972-10-10 Cincinnati Mine Machinery Co Resilient mounting for cutting tools of mining machines and the like
DE3341321C2 (en) * 1983-11-15 1986-04-24 Ruhrkohle Ag, 4300 Essen Arrangement of the cutting bit holder on the cutting body
DE3441950C1 (en) 1984-11-16 1986-04-24 Paurat GmbH, 4223 Voerde Device for holding the picks and for controlling the spray-medium feed in a cutting head for a heading machine
DE8512938U1 (en) * 1985-05-02 1985-07-25 Kennametal GmbH, 6382 Friedrichsdorf Device for holding a cutting chisel and for controlling the spraying agent supply in a tunneling machine
US5335977A (en) * 1993-05-26 1994-08-09 The United States Of America As Represented By The Secretary Of The Interior Double acting bit holder

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9900580A1 *

Also Published As

Publication number Publication date
AU7897698A (en) 1999-01-19
ATA109897A (en) 2000-12-15
WO1999000580A1 (en) 1999-01-07
DE59803023D1 (en) 2002-03-21
ATE213051T1 (en) 2002-02-15
EP0991848B1 (en) 2002-02-06
AT408017B (en) 2001-08-27
ZA985311B (en) 1999-01-11

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