WO2001023708A1 - Device for detachably fixing a rounded-shaft tool into a tool bushing - Google Patents

Device for detachably fixing a rounded-shaft tool into a tool bushing Download PDF

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Publication number
WO2001023708A1
WO2001023708A1 PCT/AT2000/000257 AT0000257W WO0123708A1 WO 2001023708 A1 WO2001023708 A1 WO 2001023708A1 AT 0000257 W AT0000257 W AT 0000257W WO 0123708 A1 WO0123708 A1 WO 0123708A1
Authority
WO
WIPO (PCT)
Prior art keywords
chisel
ring
annular groove
rib
fastening ring
Prior art date
Application number
PCT/AT2000/000257
Other languages
German (de)
French (fr)
Inventor
Roman Gerer
Friedrich Pichlmair
Original Assignee
Voest-Alpine Bergtechnik Gesellschaft M.B.H.
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 Gesellschaft M.B.H. filed Critical Voest-Alpine Bergtechnik Gesellschaft M.B.H.
Priority to AT00967412T priority Critical patent/ATE256818T1/en
Priority to AU77612/00A priority patent/AU7761200A/en
Priority to EP00967412A priority patent/EP1216343B1/en
Priority to DE50004816T priority patent/DE50004816D1/en
Publication of WO2001023708A1 publication Critical patent/WO2001023708A1/en

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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
    • E21C35/19—Means for fixing picks or holders
    • E21C35/197—Means for fixing picks or holders using sleeves, rings or the like, as main fixing elements
    • 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
    • E21C35/187—Mining picks; Holders therefor with arrangement of fluid-spraying nozzles
    • 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
    • E21C35/188—Mining picks; Holders therefor characterised by adaptations to use an extraction tool

Definitions

  • the invention relates to a device for releasably fixing a round shank chisel in a chisel sleeve detachably fixed in a chisel holder, in which the inner jacket of the chisel sleeve has an annular groove in which a resilient fastening ring engages in an annular groove of the chisel shaft.
  • Chisel holders for holding round shank chisels are arranged on cutting heads or cutting rollers with a relatively large diameter. Depending on the speed of rotation of the cutting heads or the cutting rollers, relatively high centrifugal forces act. Round-shank chisels should generally be able to rotate about their axis in the receiving bore or in a corresponding chisel sleeve, so that a corresponding rotation of the chisel in the sleeve must be permitted.
  • valves are additionally arranged in the interior of a chisel holder, which allow the respectively engaged chisel and the associated cutting track to be cooled via an associated nozzle, an axial displacement of the chisel in the chisel sleeve is also required in order to actuate the corresponding valve.
  • Both the chisel sleeve and the chisel itself are now subject to high wear and must be replaced if they are not worn. The time required for such a chisel exchange should naturally be as short as possible.
  • a corresponding axial displacement path In order to be able to pull a chisel out of its associated chisel sleeve, a corresponding axial displacement path must be ensured, which enables the use of an appropriate pulling tool for the rapid change of the chisel. Due to the permissible displacement and twisting movements, when the cutter head or cutter roller rotates, impact forces also act on the holder or the sleeve outside of the actual engagement of the chisel in the rock. The corresponding device for fixing the round shank chisel and the corresponding surface pressure of the chisel sleeve in the chisel holder must of course be chosen so that these impacts do not lead to an unacceptable loosening of the chisel.
  • AT 404 969 B has already proposed a solution for the rapid replacement of a worn chisel sleeve.
  • a chisel sleeve is non-positively connected to the chisel holder while maintaining a corresponding surface pressure between the conical outer jacket of the chisel sleeve and the inner wall of the receiving bore. Due to the required high surface pressure, which is intended to prevent unintentional loosening of the chisel bush, the possibility was provided for the bush to be pressed out hydraulically so that it could be released quickly.
  • the round chisel was held in the chisel sleeve via a clip ring made of spring steel. However, dust that penetrates between the chisel sleeve and the round chisel could block the axial movability of the round chisel, making it difficult to solve and quickly replace a damaged chisel.
  • EP 201 073 B1 proposed a ring made of elastic plastic in connection with a hard metal ring for the purpose of fixing the chisel, the hard metal ring being intended to secure the chisel in the chisel holder.
  • the selected training required a continuous mounting hole in the chisel holder, since the assembly and disassembly of the chisel was only possible from the rear with access to the corresponding hard metal ring.
  • a plastic ring in addition to a conventional slotted metal clip ring, a plastic ring is provided as an improvement. beat.
  • the plastic ring had to be made of highly elastic plastic, since the elastic groove must be stretched to be pressed onto the rear end of the round shank chisel. After pressing on the plastic ring with elastic expansion of the sleeve-shaped component, this elastic sleeve m reaches a corresponding circumferential groove on the chisel shaft.
  • the projecting ring rib had to be sheared off as a rule, which places relatively high demands on the quality of the material of the elastic sleeve with the ring rib if an unwanted loosening of the round shank chisel is to be prevented with certainty.
  • the invention now aims, starting from a device for fastening the round shank chisel in the chisel bushing described above, to provide an embodiment in which a clip ring can be used which, on the one hand, can be assembled with the least amount of effort and, on the other hand, certainly also occurs axial forces takes up enough to prevent unwanted loosening of the picks, which enables a quick and easy assembly and disassembly of all wear parts and especially the picks.
  • This safe and quick installation should also be guaranteed with certainty if dust and dirt in connection with water penetrate between the round shank chisel and the chisel bush and settle on the bottom of the fastening groove, the fastening element being able to be blocked.
  • the design according to the invention essentially consists in the fact that the resilient fastening ring is designed as a slotted plastic ring and has a rib running in the circumferential direction that the width of the ring groove on the inner jacket of the bushing Measured in the axial direction is greater than the width of the rib of the resilient plastic ring which extends into the annular groove and extends in the circumferential direction, and that the end face of the annular rib facing the chisel tip is parallel to the end face of the end face of the Ring groove is arranged on the inner jacket of the sleeve.
  • the resilient fastening ring is designed as a slotted plastic ring
  • corresponding dimensionally stable plastic rings can be used, the elasticity of which is ensured by the slotted design when inserted into the corresponding groove of the shaft.
  • the design according to the invention is advantageously made such that the width of the annular groove of the chisel shank, measured in the axial direction, exceeds the width of the plastic ring.
  • a greater axial play is permitted for an axial displaceability of the chisel in the chisel sleeve, with the penetration of dust and dirt only having the effect that the axial displaceability of the ring relative to the chisel shaft is impaired, but the axial displaceability in the corresponding one Groove of the chisel sleeve usually remains in order and thus ensures easy disassembly.
  • the resilient fastening ring advantageously consists of polyacetal and in particular polyacetal copolymer.
  • Such plastic f - Rings can withstand the mechanical stress with regard to wear resistance, hard stiffness and the required suspension capacity without the required holding force being impaired.
  • Particularly preferred are training in which the resilient plastic ring contains additives of M0S2 and / or PTFE and / or is reinforced by inserts made of steel wire or glass fibers.
  • the pushing of the fastening ring or clip on the shaft of the round shank chisel is, as already mentioned, facilitated by the corresponding slot of this ring, the design preferably being such that the slot running transversely to the circumferential direction of the fastening ring has an angle of 30 ° to Includes 60 °, in particular approximately 45 ° with the circumferential direction
  • the rib of the fastening ring running in the circumferential direction as well as the annular groove on the inner jacket of the bushing have a trapezoidal cross section, the end face of the rib of the fastening ring facing the chisel tip being particularly advantageously at an angle between 0 ° and 60 °, in particular approximately 45 ° with the cross-sectional plane of the fastening ring. In this way it is ensured that an unintentional loosening is reliably prevented by sudden axial forces in the direction of loosening of the round shank chisel.
  • the design is such that the depth of the ring groove of the chisel shank exceeds the total thickness of the fastening ring in the area of the ring rib. This ensures that the clip ring for assembly can be reduced in diameter in such a way as to enable the chisel m to be inserted easily
  • FIG. 1 shows a section through a chisel holder with an inserted bush and inserted chisel with an internal nozzle, in which a nozzle can be acted upon with cooling medium via a valve which can be actuated by axial displacement of the chisel
  • FIG. 2 shows an axial view of one Round-shank chisel with inserted fastening or clip ring
  • Fig. 3 shows a detail of the area of the wall of the sleeve and the bit holder designated in Fig. 1 with 3
  • Fig. 4 is a side view of the clip ring or fastening ring, partly in section.
  • Fig. 1 denotes a chisel holder, which is fixed by means of a weld seam 2 on the circumference of a cutting head or a cutting drum 3.
  • the bit holder contains a valve 4 which can be actuated by axially displacing the round shank bit 5 in the direction of the double arrow 6 and releases or closes the supply of a pressure medium via the channel 7 and a nozzle 8.
  • a further pressure medium connection 9 is provided, which opens into an annular channel between the chisel holder 1 and the bushing 10 inserted in the chisel holder, so that after the chisel 5 has been removed, the chisel sleeve 10 can be pressed out hydraulically.
  • the chisel shaft 11 of the chisel 5 has an annular groove 12, into which a fastening ring 13 is used to hold the chisel 5 in the sleeve 10.
  • the fastening ring or clip ring 13 carries a cross-sectionally trapezoidal rib 16 extending in the circumferential direction.
  • the corresponding groove 17 on the inner wall of the sleeve 10 is formed larger than the width of the annular rib 16, so that an axial displacement in the direction of the double arrow 6 is possible.
  • the width a of the fastening ring, measured in the axial direction is smaller than the width b, measured in the axial direction, of the annular groove 12 of the chisel shank 11.
  • Dust can now penetrate into the gap between the bush 10 and the chisel shank 11 and the correspondingly wider area of the annular groove 12 , so that the axial displaceability of the fastening ring 13 in the corresponding groove 12 of the chisel shaft 11 can be blocked. In these cases, however, the axial displaceability of the annular rib 16 in the groove 17 of the chisel sleeve 10 still remains, so that a safe removal of the chisel 5 is facilitated using an appropriate tool.
  • the inclined surface or end face 18 of the annular rib 16 facing the chisel tip runs parallel to the corresponding inclined surface of the groove 17, so that a corresponding surface contact is ensured, which prevents unintentional loosening of the chisel.
  • the slotted design of the clip ring or fastening ring 13 can be seen, the slot extending obliquely to the cross-sectional plane 19 of the fastening ring being indicated by 20.
  • the two converging edges of the trapezoidal cross section of the rib 16 enclose an angle of approximately 90 ° and therefore extend at an angle of approximately 45 ° to the cross-sectional plane 19 of the ring 13.

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  • 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)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Workshop Equipment, Work Benches, Supports, Or Storage Means (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

The invention relates to a device for detachably fixing a rounded-shaft tool (5) into a tool bushing which is fixed into a tool holder (1) so that it can be detached. In said device, the interior sleeve of the bushing (10) has an annular groove, into which an elastic fixing ring (13) engages that is located in an annular groove (12) of the tool shaft (11). The device is characterised in that the elastic fixing ring (13) is configured as a slotted, plastic ring which has a rib (16) running around its periphery and that the width of the annular groove (17) on the interior sleeve of the bushing, when measured in an axial direction, is greater than the width of the rib (16) which runs around the periphery of the elastic plastic ring and extends into said annular groove (17). In addition, the front face (18) of the ring rib (16) which faces the tool tip is positioned parallel to the front face of the annular groove (17) on the interior sleeve of the bushing (10), pointing towards said front face of the ring rib.

Description

Einrichtung zum lösbaren Festlegen eines Rundschaf tmeißels in einer Meißelbüchse Device for releasably fixing a round chisel in a chisel sleeve
Die Erfindung bezieht sich auf eine Einrichtung zum lösbaren Festlegen eines Rundschaftmeißels in einer in einem Meißelhalter lösbar festgelegten Meißelbüchse, bei welcher der Innenmantel der Meißelbüchse eine Ringnut aufweist, in welche ein in einer Ringnut des Meißelscha tes aufgenommener federnder Befestiguncjs- ring eingreift.The invention relates to a device for releasably fixing a round shank chisel in a chisel sleeve detachably fixed in a chisel holder, in which the inner jacket of the chisel sleeve has an annular groove in which a resilient fastening ring engages in an annular groove of the chisel shaft.
Meißelhalter für die Aufnahme von Rundschaftmeißel sind an Schrämköpfen bzw. Schrämwalzen mit relativ großem Durchmesser angeordnet. Je nach Rotationsgeschwindigkeit der Schrämköpfe bzw. der Schrämwalzen wirken relativ hohe Zentrifugalkräf e. Rundschaftmeißel sollen in der Regel in der Aufnahmebohrung bzw. einer entsprechenden Meißelbüchse um ihre Achse rotieren können, sodaß eine entsprechende Verdrehung des Meißels in der Büchse zugelassen werden muß. Wenn zusätzlich beispielsweise im Inneren eines Meißelhalters Ventile angeordnet sind, welche den jeweils im Eingriff stehenden Meißel sowie die zugehörige Schneidspur über eine jeweils zugeordnete Düse zu kühlen erlauben, ist auch eine axiale Verschiebbarkeit des Meißels in der Meißelbüchse erforderlich, um das entsprechende Ventil zu betätigen. Sowohl die Meißelbüchse als auch die Meißel selbst sind nun einem hohen Verschleiß unterworfen und müssen bei unzulässigem Verschleiß getauscht werden. Der Zeitaufwand für einen derartigen Meirßel- tausch soll naturgemäß so gering wie nur möglich sein. Um einen Meißel aus seiner zugehörigen Meißelbüchse abziehen zu können, muß ein entsprechender axialer Verschiebeweg sichergestellt wer- den, welcher den Einsatz eines entsprechenden Abziehwerkzeuges zum raschen Wechsel des Meißels ermöglicht. Bedingt durch die zulässigen Verschiebe- und Verdrehbewegungen wirken bei der Rotation des Schrämkopfes oder der Schrämwalze auch außerhalb des eigentlichen Eingriffes des Meißels in das Gestein Schlagkräfte auf die Halterung bzw. die Büchse. Die entsprechende Einrichtung zum Festlegen des Rundschaftmeißels sowie die entsprechende Flächenpressung der Meißelbüchse im Meißelhalter muß naturgemäß so gewählt werden, daß diese Schläge nicht zu einem unzulässigen Lösen des Meißels führen. Aufgrund dieses Spiels gelangt aber nun auch Gesteinsstaub in die Meißelbüchse und damit auch in den Bereich der Meißelfestlegung, welche üblicherweise von einem fe- dernden Befestigungsring gebildet ist, sodaß ein auf diese Weise eingedrungener Staub die axiale Verschiebbarkeit zum Zwecke eines raschen Lösens eines schadhaften Meißels erheblich einschränken kann oder sogar verhindern kann .Chisel holders for holding round shank chisels are arranged on cutting heads or cutting rollers with a relatively large diameter. Depending on the speed of rotation of the cutting heads or the cutting rollers, relatively high centrifugal forces act. Round-shank chisels should generally be able to rotate about their axis in the receiving bore or in a corresponding chisel sleeve, so that a corresponding rotation of the chisel in the sleeve must be permitted. If, for example, valves are additionally arranged in the interior of a chisel holder, which allow the respectively engaged chisel and the associated cutting track to be cooled via an associated nozzle, an axial displacement of the chisel in the chisel sleeve is also required in order to actuate the corresponding valve. Both the chisel sleeve and the chisel itself are now subject to high wear and must be replaced if they are not worn. The time required for such a chisel exchange should naturally be as short as possible. In order to be able to pull a chisel out of its associated chisel sleeve, a corresponding axial displacement path must be ensured, which enables the use of an appropriate pulling tool for the rapid change of the chisel. Due to the permissible displacement and twisting movements, when the cutter head or cutter roller rotates, impact forces also act on the holder or the sleeve outside of the actual engagement of the chisel in the rock. The corresponding device for fixing the round shank chisel and the corresponding surface pressure of the chisel sleeve in the chisel holder must of course be chosen so that these impacts do not lead to an unacceptable loosening of the chisel. Because of this play, however, rock dust now also gets into the chisel sleeve and thus also into the area of the chisel fixing, which is usually formed by a resilient fastening ring, so that dust that has penetrated in this way considerably increases the axial displaceability for the purpose of quickly loosening a damaged chisel can restrict or even prevent.
In der AT 404 969 B ist bereits eine Lösung für den raschen Austausch einer verschlissenen Meißelbüchse vorgeschlagen worden. Bei dieser bekannten Ausbildung ist eine Meißelbüchse kraftschlüssig unter Einhaltung eines entsprechenden Flächendruckes zwischen dem konischen Außenmantel der Meißelbüchse und der Innenwand der Aufnahmebohrung mit dem Meißelhalter verbunden. Aufgrund der geforderten hohen Flächenpressung, welche unbeabsichtigtes Lösen der Meißelbüchse verhindern soll, wurde für eine rasche Lösbarkeit dieser Büchse die Möglichkeit vorgesehen, die Büchse hydraulisch auszupressen. Bei dieser bekannten Aus- bildung war der Rundschaftmeißel über einen aus Federstahl bestehenden Clippring in der Meißelbüchse gehalten. Ein zwischen Meißelbüchse und Rundmeißel schaff eindringender Staub konnte jedoch zu einem Blockieren der axialen Bewegbarkeit des Rundschaf tmeißels führen, wodurch die Lösung und der rasche Aus- tausch eines schadhaft gewordenen Meißels erschwert wurde.AT 404 969 B has already proposed a solution for the rapid replacement of a worn chisel sleeve. In this known design, a chisel sleeve is non-positively connected to the chisel holder while maintaining a corresponding surface pressure between the conical outer jacket of the chisel sleeve and the inner wall of the receiving bore. Due to the required high surface pressure, which is intended to prevent unintentional loosening of the chisel bush, the possibility was provided for the bush to be pressed out hydraulically so that it could be released quickly. In this known design, the round chisel was held in the chisel sleeve via a clip ring made of spring steel. However, dust that penetrates between the chisel sleeve and the round chisel could block the axial movability of the round chisel, making it difficult to solve and quickly replace a damaged chisel.
In der EP 201 073 Bl wurde zum Zwecke der Festlegung des Meißels ein aus elastischem Kunststoff bestehender Ring in Verbindung mit einem Hartmetallring vorgeschlagen, wobei der Hartmetallring die Befestigung des Meißels im Meißelhalter bewirken soll. Die gewählte Ausbildung erforderte allerdings eine durchgehende Aufnahmebohrung im Meißelhalter, da die Montage und Demontage des Meißels nur bei einem Zugang zu dem entsprechenden Hartmetall - ring von der Rückseite her möglich war.EP 201 073 B1 proposed a ring made of elastic plastic in connection with a hard metal ring for the purpose of fixing the chisel, the hard metal ring being intended to secure the chisel in the chisel holder. However, the selected training required a continuous mounting hole in the chisel holder, since the assembly and disassembly of the chisel was only possible from the rear with access to the corresponding hard metal ring.
In der WO 95/27840 wird neben einem konventionellen geschlitzten Clippring aus Metall als Verbesserung ein Kunststoffring vorge- schlagen. Der Kunststoffring mußte aus hochelastischen Kunststoff bestehen, da die elastische riαlse geαehnt werden muß, an über das hintere Ende des Rundschaftmeißels aufgepreßt zu werden. Nach dem Aufpressen des Kunststoffringes unter elastischer Aufweitung des hulsenformigen Bauteiles, gelangt diese elastische Hülse m eine entsprechende Umfangsnut am Meißelschaft. Zum Abziehen des Meißels mußte hiebei in aller Regel die vorspringende Ringrippe abgeschert werden, wodurch relativ hohe Anforderungen an die Qualität des Materials der elastischen Hülse mit der Ringrippe gestellt werden, wenn ein ungewolltes Losen des Rundschaftmeißels mit Sicherheit verhindert werden soll.In WO 95/27840, in addition to a conventional slotted metal clip ring, a plastic ring is provided as an improvement. beat. The plastic ring had to be made of highly elastic plastic, since the elastic groove must be stretched to be pressed onto the rear end of the round shank chisel. After pressing on the plastic ring with elastic expansion of the sleeve-shaped component, this elastic sleeve m reaches a corresponding circumferential groove on the chisel shaft. To pull off the chisel, the projecting ring rib had to be sheared off as a rule, which places relatively high demands on the quality of the material of the elastic sleeve with the ring rib if an unwanted loosening of the round shank chisel is to be prevented with certainty.
Die Erfindung zielt nun darauf ab, ausgehend von einer eingangs beschriebenen Einrichtung zur Befestigung des Rundschaftmeißels in der Meißelbuchse, eine Ausbildung zu schaffen, bei welcher ein Clippring Verwendung finden kann, der einerseits mit geringstem Kraftaufwand montiert werden kann und andererseits mit Sicherheit auch auftretende axiale Kräfte ausreichend aufnimmt, um ein ungewolltes Losen des Rundschaftmeißels zu verhindern, womit insgesamt eine rasche und leichte Montage sowie Demontage aller Verschleißteile und insbesondere des Rundschaftmeißels ermöglicht wird. Diese sichere und rasche Montage soll dabei auch dann mit Sicherheit gewahrleistet sein, wenn zwischen Rundschaftmeißel und Meißelbuchse Staub und Schmutz in Verbindung mit Wasser eindringt und sich am Grund der Befestigungsnut absetzt, wobei das Befestigungselement blockiert werden kann.The invention now aims, starting from a device for fastening the round shank chisel in the chisel bushing described above, to provide an embodiment in which a clip ring can be used which, on the one hand, can be assembled with the least amount of effort and, on the other hand, certainly also occurs axial forces takes up enough to prevent unwanted loosening of the picks, which enables a quick and easy assembly and disassembly of all wear parts and especially the picks. This safe and quick installation should also be guaranteed with certainty if dust and dirt in connection with water penetrate between the round shank chisel and the chisel bush and settle on the bottom of the fastening groove, the fastening element being able to be blocked.
Zur Losung dieser Aufgabe besteht die erfindungsgemaße Ausbildung, ausgehend von der eingangs genannten Einrichtung, im we- sentlichen darin, daß der federnde Befestigungsring als geschlitzter Kunststoffring ausgebildet ist und eine in ümfangs- richtung verlaufende Rippe tragt, daß die Breite der Ringnut am Innenmantel der Buchse m axialer Richtung gemessen großer ist als die Breite der in Umfangsπchtung verlaufenden in diese Ringnut eintauchenden Rippe des federnden Kunststoffringes und daß die der Meißelspitze zugewandte Stirnflache der Ringrippe parallel zu der dieser Stirnflache zugewandten Stirnflache der Ringnut am Innenmantel der Büchse angeordnet ist. Dadurch, daß der federnde Befestigungsring als geschlitzter Kunststoffr ing ausgebildet ist, können entsprechende formstabile Kunststoffrin- ge Verwendung finden, deren Elastizität beim Einsetzen in die entsprechende Nut des Schaftes durch die geschlitzte Ausbildung gewährleistet ist. Dadurch, daß nun die Breite der Ringnut am Innenmantel der Büchse in axialer Richtung gemessen größer ist als die Breite der in Umfangsrichtung verlaufenden in diese Ringnut eintauchenden Rippe des federnden Kunststoffringes, wird nun sichergestellt, daß auch dann, wenn Staub und Schmutz in Verbindung mit Wasser eingedrungen ist und eine axiale Verschiebbarkeit des Befestigungsringes in der entsprechenden Aufnahmenut des Schaftes nicht mehr gewährleistet ist, eine entsprechende axiale Verschiebbarkeit des Meißels erzielt werden kann, welche den Angriff eines Werkzeuges ermöglicht, um auf diese Weise den Meißel rasch zu wechseln. Dadurch, daß nun die der Meißelspitze zugewandte Stirnfläche der Ringrippe parallel zu der dieser Stirnfläche zugewandten Stirnfläche der Ringnut am Innenmantel der Büchse angeordnet ist, wird ein entsprechender Anschlag ausgebildet, welcher auch bei hohen axialen Kräften aufgrund der Zentrifugalkraft eine sichere Festlegung des Meißels in der Büchse gewährleistet.To solve this problem, the design according to the invention, based on the device mentioned at the outset, essentially consists in the fact that the resilient fastening ring is designed as a slotted plastic ring and has a rib running in the circumferential direction that the width of the ring groove on the inner jacket of the bushing Measured in the axial direction is greater than the width of the rib of the resilient plastic ring which extends into the annular groove and extends in the circumferential direction, and that the end face of the annular rib facing the chisel tip is parallel to the end face of the end face of the Ring groove is arranged on the inner jacket of the sleeve. Due to the fact that the resilient fastening ring is designed as a slotted plastic ring, corresponding dimensionally stable plastic rings can be used, the elasticity of which is ensured by the slotted design when inserted into the corresponding groove of the shaft. The fact that the width of the annular groove on the inner jacket of the bushing is greater in the axial direction than the width of the rib of the resilient plastic ring which extends into the circumferential direction and which is immersed in this annular groove, now ensures that even when dust and dirt are in contact with water has penetrated and an axial displaceability of the fastening ring in the corresponding receiving groove of the shank is no longer guaranteed, a corresponding axial displaceability of the chisel can be achieved, which enables the attack of a tool in order to change the chisel quickly in this way. Because the end face of the ring rib facing the chisel tip is now arranged parallel to the end face of the annular groove facing this end face on the inner jacket of the bushing, a corresponding stop is formed which, even with high axial forces due to the centrifugal force, reliably fixes the chisel in the bushing guaranteed.
Mit Vorteil ist die erfindungsgemäße Ausbildung so getroffen, daß die Breite der Ringnut des Meißelschaftes in axialer Richtung gemessen die Breite des Kunststoffringes übersteigt. Auf diese Weise wird ein größeres axiales Spiel für eine axiale Verschiebbarkeit des Meißels in der Meißelbüchse zugelassen, wobei ein Eindringen von Staub und Schmutz lediglich dazu führt, daß die axiale Verschiebbarkeit des Ringes relativ zum Meißelschaft beeinträchtigt wird, wobei jedoch die axiale Verschiebbarkeit in der entsprechenden Nut der Meißelbüchse in aller Regel bestellen bleibt und auf diese Weise eine einfache Demontage gewährleis et bleibt.The design according to the invention is advantageously made such that the width of the annular groove of the chisel shank, measured in the axial direction, exceeds the width of the plastic ring. In this way, a greater axial play is permitted for an axial displaceability of the chisel in the chisel sleeve, with the penetration of dust and dirt only having the effect that the axial displaceability of the ring relative to the chisel shaft is impaired, but the axial displaceability in the corresponding one Groove of the chisel sleeve usually remains in order and thus ensures easy disassembly.
Mit Vorteil besteht der federnde Bef estigungsring aus Polyace tal und insbesondere Polyacetalcopolymerisat . Derartige Kunststo f - ringe können die mechanische Beanspruchung im Hinblick auf Abliebfestigkeit Hartesteif lgkei und das geforderte Federungs- vermogen sicher aufnehmen, ohne daß die geforderte Haltekraft beeinträchtigt wird Besonders bevorzugt sind hiebei Ausbildun- gen, bei welchen der federnde Kunststof f ring Zusätze von M0S2 und/oder PTFE enthalt und/oder durch Einlagen aus Stahldraht oder Glasfasern armiert ist.The resilient fastening ring advantageously consists of polyacetal and in particular polyacetal copolymer. Such plastic f - Rings can withstand the mechanical stress with regard to wear resistance, hard stiffness and the required suspension capacity without the required holding force being impaired. Particularly preferred are training in which the resilient plastic ring contains additives of M0S2 and / or PTFE and / or is reinforced by inserts made of steel wire or glass fibers.
Das Aufschieben des Befestigungsringes bzw. Clipprmges auf den Schaft des Rundschaftmeißels wird, wie bereits erwähnt, durch den entsprechenden Schlitz dieses Ringes erleichtert, wobei mit Vorzug die Ausbildung so getroffen ist, daß der quer zur Umfangsrichtung des Befestigungsringes verlaufende Schlitz einen Winkel von 30° bis 60°, insbesondere etwa 45° mit der Umfangs- πchtung einschließtThe pushing of the fastening ring or clip on the shaft of the round shank chisel is, as already mentioned, facilitated by the corresponding slot of this ring, the design preferably being such that the slot running transversely to the circumferential direction of the fastening ring has an angle of 30 ° to Includes 60 °, in particular approximately 45 ° with the circumferential direction
Mit Vorteil weist die m Umfangsrichtung verlaufende Rippe des Befestigungsringes ebenso wie die Ringnut am Innenmantel der Buchse trapezförmigen Querschnitt auf, wobei m besonders vor- teilhafter Weise die der Meißelspitze zugewandte Stirnflache der Rippe des Befestigungsringes einen Winkel zwischen 0° und 60°, insbesondere etwa 45° mit der Querschnittsebene des Befestigungsringes einschließt. Auf diese Weise wird sichergestellt, daß auch durch schlagartig auftretende axiale Kr fte in Richtung eines Losens des Rundschaftmeißels ein ungewolltes Losen mit Sicherheit verhindert wird.Advantageously, the rib of the fastening ring running in the circumferential direction as well as the annular groove on the inner jacket of the bushing have a trapezoidal cross section, the end face of the rib of the fastening ring facing the chisel tip being particularly advantageously at an angle between 0 ° and 60 °, in particular approximately 45 ° with the cross-sectional plane of the fastening ring. In this way it is ensured that an unintentional loosening is reliably prevented by sudden axial forces in the direction of loosening of the round shank chisel.
In besonders vorteilhafter Weise ist die Ausbildung so getroffen, daß die Tiefe der Ringnut des Meißelschaftes die Gesamtdicke des Befestigungsringes im Bereich der Ringrippe übersteigt. Dadurch ist gewährleistet, daß der Clippring für die Montage im Durchmesser derart verkleinerbar wird, um ein leicϊ t- gangiges Einfuhren des Meißels m die Meißelbuchse zu ermöglichenIn a particularly advantageous manner, the design is such that the depth of the ring groove of the chisel shank exceeds the total thickness of the fastening ring in the area of the ring rib. This ensures that the clip ring for assembly can be reduced in diameter in such a way as to enable the chisel m to be inserted easily
Die Erfindung wird nachfolgend anhand eines m der Zeichnung schematisch dargestellten Ausfuhrungsbeispieles naher erläutert. In dieser zeigen Fig. 1 einen Schnitt durch einen Meißelhalter mit eingesetzter Büchse und eingesetztem Meißel mit einer Innen- bedüsung, bei welcher eine Düse über ein durch axiale Verschiebung des Meißels betätigbares Ventil mit Kühlmedium beaufschlagt werden kann, Fig. 2 eine axiale Ansicht auf einen Rundschaftmeißel mit eingelegtem Bef estigungs- bzw. Klippring, Fig. 3 ein Detail des in Fig. 1 mit 3 bezeichneten Bereiches der Wand der Büchse und des Meißelhalters und Fig. 4 eine Seitenansicht des Klippringes bzw. Befestigungsringes teilweise im Schnitt.The invention is explained in more detail below with reference to an exemplary embodiment shown schematically in the drawing. 1 shows a section through a chisel holder with an inserted bush and inserted chisel with an internal nozzle, in which a nozzle can be acted upon with cooling medium via a valve which can be actuated by axial displacement of the chisel, and FIG. 2 shows an axial view of one Round-shank chisel with inserted fastening or clip ring, Fig. 3 shows a detail of the area of the wall of the sleeve and the bit holder designated in Fig. 1 with 3 and Fig. 4 is a side view of the clip ring or fastening ring, partly in section.
In Fig. 1 ist mit 1 ein Meißelhalter bezeichnet, welcher über eine Schweißnaht 2 am Umfang eines Schrämkopfes bzw. einer Schrämtrommel 3 festgelegt ist. Der Meißelhalter enthält bei der Darstellung nach Fig. 1 ein Ventil 4, welches durch axiale Ver- Schiebung des Rundschaftmeißels 5 in Richtung des Doppelpfeiles 6 betätigt werden kann und die Zufuhr eines Druckmediums über den Kanal 7 und eine Düse 8 freigibt oder verschließt. Am Meißelhalter ist ein weiterer Drückmittelanschluß 9 vorgesehen, welcher in einem Ringkanal zwischen Meißelhalter 1 und der in dem Meißelhalter eingesetzten Büchse 10 mündet, sodaß nach Herausnehmen des Meißels 5 die Meißelbüchse 10 hydraulisch ausgepreßt werden kann. Der Meißelschaft 11 des Meißels 5 weist eine Ringnut 12 auf, in welche ein Bef estigungs- bzw. Clippring 13 eingesetzt wird, um den Meißel 5 in der Büchse 10 zu halten. Durch axiale Verschiebung des Meißels 5 in Richtung des Doppelpfeiles 6 kann der die Büchse 10 übergreifende Ringbord 14 entsprechend von der Büchse 10 abgehoben werden, sodaß ein Werkzeug angesetzt werden kann, über welches der Meißel 5 aus der Büchse 10 abgezogen werden kann.In Fig. 1, 1 denotes a chisel holder, which is fixed by means of a weld seam 2 on the circumference of a cutting head or a cutting drum 3. In the illustration according to FIG. 1, the bit holder contains a valve 4 which can be actuated by axially displacing the round shank bit 5 in the direction of the double arrow 6 and releases or closes the supply of a pressure medium via the channel 7 and a nozzle 8. On the chisel holder, a further pressure medium connection 9 is provided, which opens into an annular channel between the chisel holder 1 and the bushing 10 inserted in the chisel holder, so that after the chisel 5 has been removed, the chisel sleeve 10 can be pressed out hydraulically. The chisel shaft 11 of the chisel 5 has an annular groove 12, into which a fastening ring 13 is used to hold the chisel 5 in the sleeve 10. By axially displacing the chisel 5 in the direction of the double arrow 6, the ring rim 14 which overlaps the sleeve 10 can be lifted from the sleeve 10 accordingly, so that a tool can be used to pull the chisel 5 out of the sleeve 10.
In der Darstellung nach Fig. 2 ist schematisch die Anordnung des Clippringes 13 im Inneren der Nut 12 des Meißelschaftes 11 des Meißels 5 näher verdeutlicht. Der Meißel selbst kann hiebei mit einer Hartmaterialspitze 15 versehen sein.2, the arrangement of the clip ring 13 in the interior of the groove 12 of the chisel shank 11 of the chisel 5 is schematically illustrated in more detail. The chisel itself can be provided with a hard material tip 15.
Bei der Darstellung nach Fig. 3, welche ein Detail der Fig. 1 entsprechend dem durch den Kreis III angedeuteten Bereich ver- größert darstellt, ist ersichtlich, daß der Befestigungsring bzw. Clippring 13 eine im Querschnitt trapezförmige in Umfangsrichtung verlaufende Rippe 16 trägt. Die entsprechende Nut 17 an der Innenwand der Büchse 10 ist größer ausgebildet als die Breite der Ringrippe 16, sodaß eine axiale Verschiebbarkeit in Richtung des Doppelpfeiles 6 möglich ist. Bei dieser Ausbildung ist die in axialer Richtung gemessene Breite a des Befestigungsringes kleiner als die in axialer Richtung gemessene Breite b der Ringnut 12 des Meißelschaftes 11. In dem Spalt zwischen Büchse 10 und Meißelschaft 11 sowie dem entsprechend breiteren Bereich der Ringnut 12 kann nun Staub eindringen, sodaß die axiale Verschiebbarkeit des Befestigungsringes 13 in der entsprechenden Nut 12 des Meißelschaftes 11 blockiert werden kann. In diesen Fällen bleibt aber immer noch die axiale Verschieb- barkeit der Ringrippe 16 in der Nut 17 der Meißelbüchse 10 bestehen, sodaß ein sicheres Abziehen des Meißels 5 unter Verwendung eines entsprechenden Werkzeuges erleichtert wird. Die der Meißelspitze zugewandte Schrägfläche bzw. Stirnfläche 18 der Ringrippe 16 verläuft hiebei parallel zu der entsprechenden Schrägfläche der Nut 17, sodaß ein entsprechender Flächenkontakt gewährleistet ist, welcher ein unbeabsichtigtes Lösen des Meißels verhindert.3, which shows a detail of FIG. 1 corresponding to the area indicated by the circle III represents larger, it can be seen that the fastening ring or clip ring 13 carries a cross-sectionally trapezoidal rib 16 extending in the circumferential direction. The corresponding groove 17 on the inner wall of the sleeve 10 is formed larger than the width of the annular rib 16, so that an axial displacement in the direction of the double arrow 6 is possible. In this embodiment, the width a of the fastening ring, measured in the axial direction, is smaller than the width b, measured in the axial direction, of the annular groove 12 of the chisel shank 11. Dust can now penetrate into the gap between the bush 10 and the chisel shank 11 and the correspondingly wider area of the annular groove 12 , so that the axial displaceability of the fastening ring 13 in the corresponding groove 12 of the chisel shaft 11 can be blocked. In these cases, however, the axial displaceability of the annular rib 16 in the groove 17 of the chisel sleeve 10 still remains, so that a safe removal of the chisel 5 is facilitated using an appropriate tool. The inclined surface or end face 18 of the annular rib 16 facing the chisel tip runs parallel to the corresponding inclined surface of the groove 17, so that a corresponding surface contact is ensured, which prevents unintentional loosening of the chisel.
Bei der Ausbildung nach Fig. 4 ist die geschlitzte Ausbildung des Clippringes bzw. Befestigungsringes 13 ersichtlich, wobei der schräg zur Querschnittsebene 19 des Befestigungsringes verlaufende Schlitz mit 20 angedeutet ist. Die beiden zueinander konvergenten Kanten des trapezförmigen Querschnittes der Rippe 16 schließen hiebei einen Winkel von etwa 90° ein und verlaufen daher unter einem Winkel von etwa 45° zur Querschnittsebene 19 des Ringes 13. 4, the slotted design of the clip ring or fastening ring 13 can be seen, the slot extending obliquely to the cross-sectional plane 19 of the fastening ring being indicated by 20. The two converging edges of the trapezoidal cross section of the rib 16 enclose an angle of approximately 90 ° and therefore extend at an angle of approximately 45 ° to the cross-sectional plane 19 of the ring 13.

Claims

Patentansprαche ■ Patent claims ■
1. Einrichtung zum losbaren Festlegen eines Rundschaftmeißels m einer m einem Meißelhalter (1) losbar festgelegten Meißelbuchse (10) , bei v/elcher der Innenmantel der Buchse (10) eine Ringnut (17) aufweist, in welche ein in einer Ringnut (12) des Meißelschaftes (11) aufgenommener federnder Befestigungsring (13) eingreift, dadurch gekennzeichnet, daß der federnde Befestigungsring (13) als geschlitzter Kunststo f ring ausgebildet ist und eine in Umfangsrichtung verlaufende Rippe (16) trägt, daß die Breite der Ringnut (17) am Innenmantel der Büchse (10) in axialer Richtung gemessen großer ist als die Breite der in Umfangsrichtung verlaufenden in diese Ringnut (17) eintauchenden Rippe (16) des federnden Kunststof f ringes (13) und daß die der Meißelspitze (15) zugewandte Stirnflache (18) der Ringrippe (16) parallel zu der dieser Stirnflache (18) zugewandten Stirnflache der Ringnut (17) am Innenmantel der Buchse (10) angeordnet ist.1. Device for the detachable fixing of a round shank chisel in a chisel socket (10) detachably fixed in a chisel holder (1), in v / elcher the inner jacket of the socket (10) has an annular groove (17) into which an in an annular groove (12) the resilient fastening ring (13) of the chisel shaft (11) engages, characterized in that the resilient fastening ring (13) is designed as a slotted plastic ring and carries a rib (16) running in the circumferential direction that the width of the annular groove (17) on Inner jacket of the sleeve (10) measured in the axial direction is greater than the width of the rib (16) of the resilient plastic ring (13) which extends into this annular groove (17) and extends in the circumferential direction and that the end face (18) facing the chisel tip (15) ) of the annular rib (16) is arranged parallel to the end face of the annular groove (17) facing this end face (18) on the inner surface of the bushing (10).
2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Breite der Ringnut (12) des Meißelschaftes (11) in axialer Richtung gemessen die Breite des Kunststoffringes (13) übersteigt.2. Device according to claim 1, characterized in that the width of the annular groove (12) of the chisel shaft (11) measured in the axial direction exceeds the width of the plastic ring (13).
3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichn t, daß der federnde Befestigungsring (13) aus Polyacetal und msbe- sondere Polyacetalcopolymeπsat besteht.3. Device according to claim 1 or 2, characterized gekennzeichn t that the resilient fastening ring (13) consists of polyacetal and ms- special polyacetalcopolymeπsat.
4. Einrichtung nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß der federnde Kunststof f ring (13) Zusätze von M0S2 und/ oder PTFE enthalt und/oder durch Einlagen aus Stahldraht oder Glasfasern armiert ist.4. Device according to claim 1, 2 or 3, characterized in that the resilient plastic ring (13) contains additives of M0S 2 and / or PTFE and / or is reinforced by inserts made of steel wire or glass fibers.
5. Einrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der quer zur Umfangsrichtung (19) des Befest i- gungsringes (13) verlaufende Schlitz (20) einen Winkel von 30° bis 60°, insbesondere etwa 45° mit der Umfangsrichtung (19) einschließt . 5. Device according to one of claims 1 to 4, characterized in that the transverse to the circumferential direction (19) of the fastening i- ing ring (13) extending slot (20) an angle of 30 ° to 60 °, in particular about 45 ° with the Includes circumferential direction (19).
6 . Einrichtung nach einem der Ansprüche 1 bis 5 , dadurch gekennzeichnet , daß die in Umfangsrichtung verlaufende Rippe ( 16 ) des Befestigungsringes ( 13 ) ebenso wie die Ringnut ( 17 ) am Innenmantel der Büchse ( 10 ) trapezförmigen Querschnitt aufweist .6. Device according to one of claims 1 to 5, characterized in that the circumferential rib (16) of the fastening ring (13) as well as the annular groove (17) on the inner surface of the sleeve (10) has a trapezoidal cross section.
7. Einrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die der Meißelspitze (15) zugewandte Stirnfläche (18) der Rippe (16) des Befestigungsringes (13) einen in el zwischen 0° und 60°, insbesondere etwa 45° mit der Querschni tts- ebene des Befestigungsringes (13) einschließt.7. Device according to one of claims 1 to 6, characterized in that the chisel tip (15) facing end face (18) of the rib (16) of the fastening ring (13) one in el between 0 ° and 60 °, in particular about 45 ° with the cross-sectional plane of the fastening ring (13).
8. Einrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Tiefe der Ringnut (12) des Meißelschaftes (11) die Gesamtdicke des Befestigungsringes (13) im Bereich der Ring- rippe (16) übersteigt. 8. Device according to one of claims 1 to 7, characterized in that the depth of the annular groove (12) of the chisel shank (11) exceeds the total thickness of the fastening ring (13) in the region of the annular rib (16).
PCT/AT2000/000257 1999-09-28 2000-09-26 Device for detachably fixing a rounded-shaft tool into a tool bushing WO2001023708A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT00967412T ATE256818T1 (en) 1999-09-28 2000-09-26 DEVICE FOR RESOLVABLY FIXING A ROUND SHAFT CHISEL IN A CHISEL BUSH
AU77612/00A AU7761200A (en) 1999-09-28 2000-09-26 Device for detachably fixing a rounded-shaft tool into a tool bushing
EP00967412A EP1216343B1 (en) 1999-09-28 2000-09-26 Device for detachably fixing a rounded-shaft tool into a tool bushing
DE50004816T DE50004816D1 (en) 1999-09-28 2000-09-26 DEVICE FOR DETACHABLE A ROUNDING CHISEL IN A CHISEL BUSH

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Application Number Priority Date Filing Date Title
AT166299 1999-09-28
ATA1662/99 1999-09-28

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WO2001023708A1 true WO2001023708A1 (en) 2001-04-05

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AU (1) AU7761200A (en)
DE (1) DE50004816D1 (en)
ES (1) ES2176129T3 (en)
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AU7761200A (en) 2001-04-30
EP1216343B1 (en) 2003-12-17
ES2176129T1 (en) 2002-12-01
EP1216343A1 (en) 2002-06-26
DE50004816D1 (en) 2004-01-29
ES2176129T3 (en) 2004-06-16

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