EP2336488B1 - Pick holder and base section - Google Patents

Pick holder and base section Download PDF

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Publication number
EP2336488B1
EP2336488B1 EP10188978.0A EP10188978A EP2336488B1 EP 2336488 B1 EP2336488 B1 EP 2336488B1 EP 10188978 A EP10188978 A EP 10188978A EP 2336488 B1 EP2336488 B1 EP 2336488B1
Authority
EP
European Patent Office
Prior art keywords
plug
attachment
support
receptacle
feed direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP10188978.0A
Other languages
German (de)
French (fr)
Other versions
EP2336488A3 (en
EP2336488A2 (en
Inventor
Cyrus Barimani
Karsten Buhr
Thomas Lehnert
Guenter Haehn
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.)
Wirtgen GmbH
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Wirtgen GmbH
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Filing date
Publication date
Application filed by Wirtgen GmbH filed Critical Wirtgen GmbH
Publication of EP2336488A2 publication Critical patent/EP2336488A2/en
Publication of EP2336488A3 publication Critical patent/EP2336488A3/en
Application granted granted Critical
Publication of EP2336488B1 publication Critical patent/EP2336488B1/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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
    • B28D1/186—Tools therefor, e.g. having exchangeable cutter bits
    • B28D1/188—Tools therefor, e.g. having exchangeable cutter bits with exchangeable cutter bits or cutter segments
    • 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
    • E02F9/2816—Mountings therefor
    • 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
    • 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
    • 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
    • E21C47/00—Machines for obtaining or the removal of materials in open-pit mines
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C47/00—Machines for obtaining or the removal of materials in open-pit mines
    • E21C47/02—Machines for obtaining or the removal of materials in open-pit mines for coal, brown coal, or the like

Definitions

  • the invention relates to a bit holder with a plug projection and a holding lug, wherein the holding lug has a chisel receptacle, and wherein the holding lug projecting in the tool feed direction at least partially from or over the plug approach.
  • the invention also relates to a base part with a plug-in receptacle and a support lug, which forms a support.
  • Such bases are used to hold chisel holders.
  • the base part has a plug-in receptacle, to the front side a base part section is connected with a threaded receptacle.
  • the threaded receptacle opens into the socket.
  • the bit holder is equipped with a plug-in projection, which can be inserted into the socket of the base part.
  • a Holding attachment connected, which is provided with a bit holder in the form of a through hole. The holding approach is partially in the tool feed direction on the plug approach. Contrary to the feed direction both the retaining lug and the plug-in approach are provided with support surfaces.
  • a screw is screwed into the threaded receptacle of the base part. This presses the chisel holder with its support surfaces to correspondingly shaped mating surfaces of the base part.
  • a force acts on the bit which is inserted in the bit holder. This arises when the bit engages in the material to be removed. In this case, the force direction varies during the tool attack, whereby in particular an alternating stress arises. It has been found that in such tool combinations, due to the alternating stress, the fastening screw can be solved, whereby the bit holder is no longer securely fixed in the base part.
  • such bit holder for mining work with high tool delivery, as required for example in surface mining, not sufficiently dimensioned. In particular, often results in the transition region between the holding lug and the plug approach tool breakage.
  • Dovetail connections between the base part and the bit holder are also known from the prior art. Such a configuration is for example in the US 4,915,455 shown. These dovetail joints are very vulnerable. As a result of the alternating stress, the mating surfaces between the base part and the bit holder knock out, resulting in premature failure of the system.
  • the task concerning the bit holder is achieved by a bit holder according to claim 1 and by a bit holder according to claim 2.
  • the holding approach in this case has a support section with a support surface, which is arranged in the feed direction at least partially in front of the insertion approach.
  • the projecting in the direction of the part of the holding lug can be intercepted with its rigid, molded support surface on a correspondingly shaped abutment of a base part.
  • the location of the transmission of the maximum forces occurring during the use of tools is placed close to the chisel head. This results in a significant reduction in the effective torques.
  • This strength-optimized design of the chisel holder leads to significantly longer service life and increases operational safety.
  • the support portion has two support surfaces which are at an angle to each other. In this way, a centered and backlash-free alignment of the chisel holder on corresponding mating surfaces of a base part arises. This arrangement can withstand high loads even when acting transversely to the main direction.
  • the support surfaces are arranged on both sides of the median longitudinal plane extending through the central longitudinal axis of the bit receptacle and in the direction of the longitudinal extent of the insertion projection.
  • the support surface or the support surfaces form a sliding guide whose sliding direction runs counter to the tool feed direction (v).
  • v tool feed direction
  • the support surface or the support surfaces is part of a broadening (projecting) in the direction transverse to the central longitudinal axis of the bit holder on the bit holder.
  • the spacers form Spanableit vom that protect a base part from abrasive wear attack.
  • a conceivable alternative of the invention may be such that the plug-in projection has at least one pressure surface in the area of its plug-in front in the tool feed direction, which is arranged at an angle of less than 90 °, preferably less than 80 °, to the central longitudinal axis of the plug-in extension.
  • This pressure surface serves to clamp the chisel holder with a base part.
  • Einzug can be introduced in the direction of the longitudinal axis of the plug-in projection on the pressure surfaces (for example, with a pressure screw).
  • the insertion projection preferably has a further support section with one or more bearing surfaces in the area of its plug projection rear side facing away from the tool feed direction.
  • bearing surfaces are at an angle to each other, which in turn creates a centering of the chisel holder relative to the base part, as well as an optimized power dissipation by large transmission surfaces for the forces acting.
  • the bearing surfaces extend substantially in the direction of the longitudinal axis of the plug-in projection.
  • a sliding guide is generated in plug-way longitudinal direction. If, due to wear, a base part in the area of its support section assigned to the chisel holder wears on the front side, the usability of the base part for new, unworn chisel holders nevertheless remains maintained. Over the back sliding guide the Nachsetz can be compensated.
  • the basic part of the object of the invention is achieved by a base part according to claim 13.
  • the support forming the support forming shoulder is arranged in the tool feed direction in front of the plug-in receptacle and the support is formed in front of the plug-in receptacle.
  • the base part thus offers the possibility of a power-optimized dissipation of the forces, since the support lug can be brought with its support close to the chisel tip.
  • the support forms a support surface which forms an obtuse angle with the longitudinal axis of the plug attachment.
  • this obtuse angle which should preferably extend in the range between 200 ° and 250 °, an optimized on the varying force direction during the use of tools power transfer is possible.
  • a projection is arranged, which holds in the region of the plug receptacle at least one counter-bearing, so that the above-mentioned double support of a chisel holder is possible.
  • this front side can be clamped to the support lug and the back of the abutment.
  • the support and the abutment on two support surfaces which are at an angle to each other.
  • a centering of the bit holder is achieved with respect to the base part.
  • large power transmission surfaces are possible via the slanted support surfaces.
  • the angle arrangement can be chosen so that with a small volume of construction a strength-optimized design of the base part is possible.
  • a variant of the invention is such that the support projection in the tool feed direction in front of the plug-in receptacle has a screw receptacle which opens into the region of the plug receptacle.
  • FIG. 1 shows a base member 10 having a bottom 11 with concave top surfaces. By means of this attachment surfaces, the base part can be placed on the cylindrical outer shell of a milling drum and welded firmly. A bit holder 20 is connected to the base part 10.
  • FIG. 3 shows, the base part 10 on a plug-in receptacle 15 which receives a plug 21 of the chisel holder 20.
  • FIGS. 4 to 6 the design of the bit holder 20 explained in more detail.
  • the bit holder 20, the plug approach 21, at the angle of a holding lug 25 is connected.
  • an obtuse angle is included between the plug 21 and the retaining lug 25.
  • the plug-in projection 21 forms in the region of its, in the tool feed direction (v) facing plug approach front 22 a front surface 21.1.
  • two recesses are recessed so that they form pressure surfaces 21.2.
  • the pressure surfaces 21.2 are arranged at an angle to the longitudinal axis of the plug-in projection 21.
  • the pressure surface 21.2 bearing projection of the plug 21 passes through lateral transition sections 21.3 in side surfaces 21.4 over. In this case, the side surfaces 21.4 are aligned in the direction of the tool feed direction (v) and point to the tool sides.
  • FIG. 5 can recognize the side surfaces go 21.4 in the area of the plug projection rear side 23 in bearing surfaces 21.5 over.
  • the storage areas 21.5 are at an angle to each other.
  • the bearing surfaces 21.5 in turn are connected by means of a transition surface 21.6 and have opposite to the feed direction v.
  • the retaining lug 25 is provided with a bit holder 26 in the form of a cylindrical bore.
  • the central longitudinal axis M of the bit receptacle 26 and the longitudinal axis L of the plug-in projection 21 ideally include an angle in the range between 100 ° and 160 °, preferably 130 °.
  • the bit receptacle 26 merges via an introducer extension 27 into a bearing surface 25.3.
  • the support surface 25.3 extends radially to the chisel receiver 26.
  • the chisel holder 26 faces away from the support surface 25.3 in a cross-sectional taper 25.1.
  • the cross-sectional taper 25.1 is designed in the form of a truncated cone and leads the lateral surface (25.2) of the chisel holder 20 into the bearing surface 25.3.
  • the retaining lug 25 has in the region below the bit holder 26 two support surfaces 29, which are employed in an angle to each other in a V-shape. Show how the FIG. 6 can recognize the support surfaces 29 due to their oblique position in the direction of the free end of the plug-in approach and at the same time in the feed direction (v) and run, as in FIG. 3 represented, parallel or substantially parallel to the central longitudinal axis M of the bit holder 26. Like the FIG. 5 can recognize, has the retaining lug 25 lateral widening 28 in which the support surfaces 29 expire. The support surfaces 29 and the bearing surfaces 21.5 are oriented pointing in opposite directions.
  • the base part 10 has a plug-in receptacle 15 which is adapted in its cross-section to the outer contour of the plug-in projection 21 of the bit holder 20. Front side, the plug-in receptacle 15 is limited by means of a support projection 12.
  • a screw 13 is incorporated as a thread.
  • the screw receptacle 13 opens into the plug-in receptacle 15.
  • the plug receptacle 15 faces away from the screw receptacle 13 in a bore enlargement 13.1.
  • the support lug 12 has in its upper, radially outer region on a support 18 which is formed by two support surfaces 18.1.
  • the two support surfaces 18.1 are employed at an angle to each other.
  • the angular orientation of the support surfaces 18.1 is adapted to the orientation of the support surfaces 29 of the chisel holder 20, so that the support surfaces 29 of the chisel holder 20 can rest plane-parallel on the support surfaces 18.1 of the base member 10.
  • the support surfaces 18.1 are for the purpose of the defined investment of the bit holder 20 via a recessed paragraph 18.4 connected to each other.
  • the plug-in receptacle 15 is delimited by an abutment 16.
  • the anvil 16 is part of a rear projection 17 which protrudes counter to the feed direction (v) via the plug-in receptacle 15.
  • the anvil 16 is formed by two further support surfaces 16.1, which are at an angle to each other.
  • these further support surfaces 16.1 are again adapted in their design and spatial arrangement adapted to the bearing surfaces 21.5 of the bit holder 20, so that a plane-parallel contact the other bearing surfaces 21.5 on the support surfaces 16.1 is possible.
  • the plug-in receptacle 15 is bounded by an open space 18.2.
  • the plug-in receptacle 15 is bounded by two lateral connecting sections 19.
  • the inner surfaces formed by the connecting sections 19 and facing the plug-in receptacle 15 pass over open spaces 18.5 into walls 18.6, which in turn are oriented in the tool feed direction (v).
  • the walls 18.6 turn out in the open space 18.2.
  • the mounting of the bit holder 20 on the base part 10 is carried out as follows.
  • the bit holder 20 is inserted with its plug 21 in the socket 15 of the base member 10.
  • the fastening element 14 has a pressure surface oriented at right angles to the screw axis, which abuts the pressure surface 21. 2 of the chisel holder 20.
  • the pressure surface does not have to be a flat surface, but can also be a spherical surface.
  • the FIG. 1 shows that two fastening elements 14 are used for fastening the chisel holder 20, thus also two screw receptacles 13 are incorporated into the base part 10.
  • the fastening element 14 presses against the pressure surface 21.2. Due to the angular position of the pressure surface 21.2 to the central longitudinal axis of the plug 21, the fastener 14 exerts a pull-in force on the plug 21. At the same time a force component is generated, which is opposite to the feed direction (v) and presses the plug 21 in the counter-bearing 16. The extending in the direction of the longitudinal axis of the plug 21 force component brings the support surfaces 18.1 of the support 18 with the support surfaces 29 of the chisel holder 20 to the plant. A tension of the fasteners 14 now causes, as in particular from FIG.
  • the bit holder 20 experiences a support on both sides of the central longitudinal axis of the plug-in projection 21.
  • the support on the anvil 16 is made on the rear side of the central longitudinal axis and on the other on the support 18 on the front side of the central longitudinal axis.
  • the fastening screw 14 now acts on the insertion projection 21 such that a tensioning of the bit holder 20 takes place on the support 18 and the abutment 16. In this way, a secure and captive attachment of the chisel holder 20 is guaranteed.
  • FIG. 3 can further recognize that in the bore extension 13.1 of the screw 13, a cover 14.1 can be used, which covers the tool holder of the fastener 14.
  • Both the base part 10 and the bit holder 20 are formed substantially mirror-symmetrically to the transverse direction of the medium (in the transverse direction) of these respective components. This promotes a uniform load transfer.
  • FIG. 3 can recognize a unique assignment of the bit holder 20 to the base part 10 in particular guaranteed by the fact that only one edition of these two above-mentioned central support points takes place (support 18 and thrust bearing 16).
  • the free space 18.2 the walls 18.6 of the open spaces 18.5 and the connecting portion 19 of the plug 21 is released from the socket 15. If, for example, a wear of the support surfaces 18.1 takes place in the course of the use of the base part 10, the paragraph 18.4 forms a reset space.
  • the spacing of the bit holder 20 from the paragraph 18.4 guarantees a repositioning of the bit holder 20 in case of wear.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Earth Drilling (AREA)
  • Jigs For Machine Tools (AREA)
  • Milling Processes (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Description

Die Erfindung betrifft einen Meißelhalter mit einem Steckansatz und einem Halteansatz, wobei der Halteansatz eine Meißelaufnahme aufweist, und wobei der Halteansatz in Werkzeugvorschubrichtung zumindest bereichsweise von dem oder über den Steckansatz vorsteht.The invention relates to a bit holder with a plug projection and a holding lug, wherein the holding lug has a chisel receptacle, and wherein the holding lug projecting in the tool feed direction at least partially from or over the plug approach.

Die Erfindung betrifft auch einen Basisteil mit einer Steckaufnahme und einen Stützansatz, der ein Auflager bildet. Solche Basisteile dienen zur Aufnahme von Meißelhaltern.The invention also relates to a base part with a plug-in receptacle and a support lug, which forms a support. Such bases are used to hold chisel holders.

Aus der US 3,992,061 ist eine Werkzeugkombination, bestehend aus einem Basisteil und einem darin eingesetzten Meißelhalter, bekannt. Hierzu weist das Basisteil eine Steckaufnahme auf, an die frontseitig ein Basisteil-Abschnitt mit einer Gewindeaufnahme angeschlossen ist. Die Gewindeaufnahme mündet in die Steckaufnahme. Der Meißelhalter ist mit einem Steckansatz ausgerüstet, der in die Steckaufnahme des Basisteils eingesetzt werden kann. An den Steckansatz ist ein Halteansatz angeschlossen, der mit einer Meißelaufnahme in Form einer Durchgangsbohrung versehen ist. Der Halteansatz steht bereichsweise in Werkzeugvorschubrichtung über den Steckansatz vor. Entgegen der Vorschubrichtung sind sowohl der Halteansatz als auch der Steckansatz mit Stützflächen versehen. Zur Fixierung des Meißelhalters wird eine Schraube in die Gewindeaufnahme des Basisteils eingeschraubt. Diese presst den Meißelhalter mit seinen Stützflächen an entsprechend ausgebildete Gegenflächen des Basisteils. Während des Werkzeugeinsatzes wirkt auf den Meißel, der in den Meißelhalter eingesetzt ist, eine Kraft ein. Diese entsteht, wenn der Meißel in das abzutragende Gut eingreift. Dabei variiert während des Werkzeugangriffes die Kraftrichtung, wodurch insbesondere eine Wechselbeanspruchung entsteht. Es hat sich gezeigt, dass bei solchen Werkzeugkombinationen, aufgrund der Wechselbeanspruchung, sich die Befestigungsschraube lösen kann, wodurch der Meißelhalter nicht mehr sicher im Basisteil fixiert ist. Weiterhin sind solche Meißelhalter für Abbauarbeiten mit hoher Werkzeugzustellung, wie es beispielsweise beim Surface-mining erforderlich ist, nicht ausreichend dimensioniert. Insbesondere entsteht häufig im Übergangsbereich zwischen dem Halteansatz und dem Steckansatz ein Werkzeugbruch.From the US 3,992,061 is a tool combination consisting of a base part and a bit holder used therein, known. For this purpose, the base part has a plug-in receptacle, to the front side a base part section is connected with a threaded receptacle. The threaded receptacle opens into the socket. The bit holder is equipped with a plug-in projection, which can be inserted into the socket of the base part. At the plug-in approach is a Holding attachment connected, which is provided with a bit holder in the form of a through hole. The holding approach is partially in the tool feed direction on the plug approach. Contrary to the feed direction both the retaining lug and the plug-in approach are provided with support surfaces. To fix the chisel holder, a screw is screwed into the threaded receptacle of the base part. This presses the chisel holder with its support surfaces to correspondingly shaped mating surfaces of the base part. During tooling, a force acts on the bit which is inserted in the bit holder. This arises when the bit engages in the material to be removed. In this case, the force direction varies during the tool attack, whereby in particular an alternating stress arises. It has been found that in such tool combinations, due to the alternating stress, the fastening screw can be solved, whereby the bit holder is no longer securely fixed in the base part. Furthermore, such bit holder for mining work with high tool delivery, as required for example in surface mining, not sufficiently dimensioned. In particular, often results in the transition region between the holding lug and the plug approach tool breakage.

Es sind daher Systeme entwickelt worden, bei denen der Meißelhalter gegenüber dem Basisteil entgegengesetzt zur Werkzeugvorschubrichtung hinter dem Steckansatz großflächig abgestützt ist, wie dies zum Beispiel die US 5,378,050 zeigt.There are therefore systems have been developed in which the bit holder opposite the base part opposite to the tool feed direction behind the plug approach is supported over a large area, as for example the US 5,378,050 shows.

Aus dem Stand der Technik sind weiterhin Schwalbenschwanzverbindungen zwischen dem Basisteil und dem Meißelhalter bekannt. Eine solche Ausgestaltung ist beispielsweise in der US 4,915,455 gezeigt. Diese Schwalbenschwanzverbindungen sind sehr anfällig. Infolge der Wechselbeanspruchung schlagen die Passflächen zwischen dem Basisteil und dem Meißelhalter aus, was zu einem vorzeitigen Gesamtausfall des Systems führt.Dovetail connections between the base part and the bit holder are also known from the prior art. Such a configuration is for example in the US 4,915,455 shown. These dovetail joints are very vulnerable. As a result of the alternating stress, the mating surfaces between the base part and the bit holder knock out, resulting in premature failure of the system.

In der US 3,498,677 wurde zur Verbesserung der Lastübertragung zwischen dem Meißelhalter und dem Basisteil der Halteansatz derart an den Steckansatz des Meißelhalters angeformt, dass dieser entgegen der Werkzeugvorschubrichtung Aus der US 2009/0085396 A1 sind die Merkmale des Oberbegriffs der Ansprüche 1, 2 und 13 bekannt.In the US 3,498,677 was formed to improve the load transfer between the bit holder and the base part of the holding approach to the plug neck of the bit holder that this against the tool feed direction from the US 2009/0085396 A1 the features of the preamble of claims 1, 2 and 13 are known.

Es ist Aufgabe der Erfindung, einen Meißelhalter bereitzustellen, der insbesondere den beim Surface-mining auftretenden hohen Belastungen zuverlässig widerstehen kann.It is an object of the invention to provide a bit holder, which can reliably withstand especially the high loads occurring during surface mining.

Es ist weiterhin Aufgabe der Erfindung, ein Basisteil für einen Meißelhalter zu schaffen, über den der Meißelhalter belastungsoptimiert abgestützt werden kann.It is a further object of the invention to provide a base part for a chisel holder over which the bit holder can be supported optimized load.

Die den Meißelhalter betreffende Aufgabe wird durch einen Meißelhalter nach Anspruch 1, und durch einen Meißelhalter nach Anspruch 2 gelöst. Der Halteansatz weist dabei einen Stützabschnitt mit einer Stützfläche auf, die in Vorschubrichtung zumindest bereichsweise vor dem Steckansatz angeordnet ist. Auf diese Weise kann der in Vorschubrichtung auskragende Teil des Halteansatzes mit seiner starren, angeformten Stützfläche auf einem entsprechend ausgebildeten Gegenlager eines Basisteils abgefangen werden. Damit wird der Ort der Übertragung der beim Werkzeugeinsatz auftretenden maximalen Kräfte dicht an den Meißelkopf gelegt. Auf diese Weise entsteht eine deutliche Verringerung der wirkenden Drehmomente. Diese festigkeitsoptimierte Auslegung des Meißelhalters führt zu deutlich längeren Standzeiten und erhöht die Betriebssicherheit.The task concerning the bit holder is achieved by a bit holder according to claim 1 and by a bit holder according to claim 2. The holding approach in this case has a support section with a support surface, which is arranged in the feed direction at least partially in front of the insertion approach. In this way, the projecting in the direction of the part of the holding lug can be intercepted with its rigid, molded support surface on a correspondingly shaped abutment of a base part. Thus, the location of the transmission of the maximum forces occurring during the use of tools is placed close to the chisel head. This results in a significant reduction in the effective torques. This strength-optimized design of the chisel holder leads to significantly longer service life and increases operational safety.

Gemäß Anspruch 1 ist es vorgesehen, dass der Stützabschnitt zwei Stützflächen aufweist, die zueinander im Winkel stehen. Auf diese Weise entsteht eine zentrierte und spielfreie Ausrichtung des Meißelhalters an entsprechenden Gegenflächen eines Basisteils. Diese Anordnung kann hohen Belastungen auch dann widerstehen, wenn sie quer zur Hauptrichtung wirken.According to claim 1, it is provided that the support portion has two support surfaces which are at an angle to each other. In this way, a centered and backlash-free alignment of the chisel holder on corresponding mating surfaces of a base part arises. This arrangement can withstand high loads even when acting transversely to the main direction.

Vorzugsweise sind die Stützflächen beidseitig der durch die Mittellängsachse der Meißelaufnahme und sich in Richtung der Längserstreckung des Steckansatzes verlaufenden Mittelquerebene angeordnet. Durch diese symmetrische Ausgestaltung wird eine gleichmäßige Kraftableitung über beide Stützflächen bewirkt. Eine denkbare Erfindungsvariante sieht vor, dass die Stützfläche oder die Stützflächen eine Schiebeführung bilden, deren Schieberichtung entgegen der Werkzeugvorschubrichtung (v) verläuft. Bei der Montage des Meißelhalters kann dieser mit seinen Stützflächen auf Gegenflächen eines Basisteils aufgesetzt werden. Anschließend wird der Meißelhalter mit einem Basisteil verspannt, wobei er in seiner Schiebeführung stufenlos in die Bestimmungsposition verlagert werden kann. Dies sichert eine eindeutige und zuverlässige Montage. Die Schiebeführung dient also dazu, den Meißelhalter in seine bestimmungsgemäße Montageposition zu führen. In der Montageposition wird der Meißelhalter fest mit dem Basisteil verbunden, sodass zwischen diesen Bauteilen keine Relativbewegung mehr möglich ist.Preferably, the support surfaces are arranged on both sides of the median longitudinal plane extending through the central longitudinal axis of the bit receptacle and in the direction of the longitudinal extent of the insertion projection. By this symmetrical design, a uniform force dissipation over both support surfaces is effected. A conceivable variant of the invention provides that the support surface or the support surfaces form a sliding guide whose sliding direction runs counter to the tool feed direction (v). When mounting the chisel holder this can be placed with its support surfaces on mating surfaces of a base part. Subsequently, the bit holder is clamped to a base part, wherein it can be displaced continuously in its sliding guide in the determination position. This ensures a clear and reliable installation. The sliding guide thus serves to guide the bit holder in its intended mounting position. In the mounting position of the bit holder is firmly connected to the base part, so that between these components no relative movement is possible.

Vorzugsweise kann es vorgesehen sein, dass die Stützfläche beziehungsweise die Stützflächen Teil einer Verbreiterung ist (sind), die in Richtung quer zur Mittellängsachse der Meißelaufnahme über die Meißelaufnahme vorstehen. Die Verbreiterungen bilden Spanableitflächen, die ein Basisteil vor abrasiven Verschleißangriff schützen.Preferably, it can be provided that the support surface or the support surfaces is part of a broadening (projecting) in the direction transverse to the central longitudinal axis of the bit holder on the bit holder. The spacers form Spanableitflächen that protect a base part from abrasive wear attack.

Eine denkbare Erfindungsalternative kann dergestalt sein, dass der Steckansatz im Bereich seiner in Werkzeugvorschubrichtung weisenden Steckansatzvorderseite wenigstens eine Druckfläche aufweist, die im Winkel kleiner als 90°, vorzugsweise kleiner als 80° zur Mittellängsachse des Steckansatzes angeordnet ist. Diese Druckfläche dient zum Verspannen des Meißelhalters mit einem Basisteil. Dadurch, dass sie im Winkel zum Steckansatz angestellt ist, können über die Druckflächen einerseits Einzugkräfte in Richtung der Längsachse des Steckansatzes eingebracht werden (beispielsweise mit einer Druckschraube). Weiterhin wird bei Beaufschlagung der Druckfläche eine Kraftkomponente quer zur Längserstreckung des Steckansatzes erzeugt, die den Steckansatz entgegen der Vorschubrichtung in ein Gegenlager eines Basisteils eindrücken kann. Auf diese Weise entsteht eine Doppelfixierung des Meißelhalters, nämlich zum Einen über die rückseitige Verspannung am Gegenlager und zum Anderen mit der vor dem Steckansatz angeordneten Stützfläche des Stützabschnittes.A conceivable alternative of the invention may be such that the plug-in projection has at least one pressure surface in the area of its plug-in front in the tool feed direction, which is arranged at an angle of less than 90 °, preferably less than 80 °, to the central longitudinal axis of the plug-in extension. This pressure surface serves to clamp the chisel holder with a base part. The fact that it is employed at an angle to the plug-in approach, on the one hand Einzugkräfte can be introduced in the direction of the longitudinal axis of the plug-in projection on the pressure surfaces (for example, with a pressure screw). Furthermore, upon application of the pressure surface, a force component transverse to the longitudinal extent of the Creates plug-in approach that can push the plug against the feed direction in a counter bearing of a base part. In this way, a double fixation of the chisel holder, namely on the one hand on the back bracing on the anvil and on the other with the arranged in front of the insertion projection support surface of the support section.

Zu diesem Zweck weist der Steckansatz vorzugsweise im Bereich seiner der Werkzeugvorschubrichtung abgewandten Steckansatzrückseite einen weiteren Stützabschnitt mit einer oder mehreren Lagerflächen auf.For this purpose, the insertion projection preferably has a further support section with one or more bearing surfaces in the area of its plug projection rear side facing away from the tool feed direction.

Dabei ist es denkbar, dass die Lagerflächen zueinander im Winkel stehen, wodurch wiederum eine Zentrierung des Meißelhalters gegenüber dem Basisteil, sowie eine optimierte Kraftableitung durch große Übertragungsflächen für die wirkenden Kräfte entsteht.It is conceivable that the bearing surfaces are at an angle to each other, which in turn creates a centering of the chisel holder relative to the base part, as well as an optimized power dissipation by large transmission surfaces for the forces acting.

Vorzugsweise verlaufen die Lagerflächen im Wesentlichen in Richtung der Längsachse des Steckansatzes. Auf diese Weise wird in Steckansatzlängsrichtung eine Schiebeführung erzeugt. Wenn nun verschleißbedingt ein Basisteil im Bereich seines dem Stützabschnitt des Meißelhalters zugeordneten Auflagers frontseitig verschleißt, so bleibt dennoch die Verwendbarkeit des Basisteils für neue, unverschlissene Meißelhalter aufrechterhalten. Über die rückseitige Schiebeführung kann die Nachsetzung ausgeglichen werden.Preferably, the bearing surfaces extend substantially in the direction of the longitudinal axis of the plug-in projection. In this way, a sliding guide is generated in plug-way longitudinal direction. If, due to wear, a base part in the area of its support section assigned to the chisel holder wears on the front side, the usability of the base part for new, unworn chisel holders nevertheless remains maintained. Over the back sliding guide the Nachsetz can be compensated.

Die das Basisteil betreffende Aufgabe der Erfindung wird durch ein Basisteil nach Anspruch 13 gelöst. Der das Auflager bildende Stützansatz ist dazu in Werkzeugvorschubrichtung vor der Steckaufnahme angeordnet und das Auflager ist vor der Steckaufnahme gebildet. Das Basisteil bietet somit die Möglichkeit einer kraftoptimierten Ableitung der Kräfte, da der Stützansatz mit seinem Auflager dicht an die Meißelspitze herangeführt werden kann. Insbesondere stellen sich die oben beschriebenen Vorteile bei Verwendung eines entsprechenden Meißelhalters an dem Basisteil ein.The basic part of the object of the invention is achieved by a base part according to claim 13. The support forming the support forming shoulder is arranged in the tool feed direction in front of the plug-in receptacle and the support is formed in front of the plug-in receptacle. The base part thus offers the possibility of a power-optimized dissipation of the forces, since the support lug can be brought with its support close to the chisel tip. In particular, the advantages described above set when using a corresponding chisel holder on the base part.

Vorzugsweise bildet das Auflager eine Stützfläche, die mit der Längsachse des Steckansatzes einen stumpfen Winkel einschließt. Durch diesen stumpfen Winkel, der vorzugsweise im Bereich zwischen 200° und 250° verlaufen sollte, wird eine auf die variierende Kraftrichtung während des Werkzeugeinsatzes optimierte Kraftabtragung möglich. Erfindungsgemäß ist vorgesehen, dass entgegen der Vorschubrichtung hinter der Steckaufnahme ein Ansatz angeordnet ist, der im Bereich der Steckaufnahme wenigstens ein Gegenlager hält, sodass die oben erwähnte Doppelabstützung eines Meißelhalters möglich wird. Insbesondere kann dieser vorderseitig an dem Stützansatz und rückseitig an dem Gegenlager verspannt werden. Hierdurch werden zum Einen großflächige Kraftübertragungsflächen geschaffen, zum Anderen lassen sich variierende Kraftrichtungen optimal abfangen.Preferably, the support forms a support surface which forms an obtuse angle with the longitudinal axis of the plug attachment. By this obtuse angle, which should preferably extend in the range between 200 ° and 250 °, an optimized on the varying force direction during the use of tools power transfer is possible. According to the invention it is provided that opposite the feed direction behind the plug-in receptacle, a projection is arranged, which holds in the region of the plug receptacle at least one counter-bearing, so that the above-mentioned double support of a chisel holder is possible. In particular, this front side can be clamped to the support lug and the back of the abutment. As a result, on the one hand large-area force transmission surfaces are created, on the other hand, varying force directions can be optimally intercepted.

Erfindungsgemäß weisen das Auflager und das Gegenlager zwei Stützflächen auf, die zueinander im Winkel stehen. Über diese Stützflächenanordnung wird eine Zentrierung des Meißelhalters gegenüber dem Basisteil erreicht. Zudem werden über die geschrägten Stützflächen große Kraftübertragungsflächen möglich. Die Winkelanordnung kann so gewählt werden, dass bei kleinem Bauvolumen eine festigkeitsoptimierte Ausgestaltung des Basisteils möglich wird.According to the invention, the support and the abutment on two support surfaces which are at an angle to each other. About this support surface arrangement, a centering of the bit holder is achieved with respect to the base part. In addition, large power transmission surfaces are possible via the slanted support surfaces. The angle arrangement can be chosen so that with a small volume of construction a strength-optimized design of the base part is possible.

Um den Meißelhalter sicher am Basisteil befestigen zu können, ist eine Erfindungsvariante dergestalt, dass der Stützansatz in Werkzeugvorschubrichtung vor der Steckaufnahme eine Schraubaufnahme aufweist, die in den Bereich der Steckaufnahme mündet.In order to secure the bit holder securely to the base part, a variant of the invention is such that the support projection in the tool feed direction in front of the plug-in receptacle has a screw receptacle which opens into the region of the plug receptacle.

Die Erfindung wird im Folgenden anhand eines in den Zeichnungen dargestellten Ausführungsbeispieles näher erläutert. Es zeigen:

Figur 1
eine Werkzeugkombination mit einem Basisteil und einem Meißelhalter in perspektivischer Frontansicht,
Figur 2
die Werkzeugkombination gemäß Figur 1 in perspektivischer Rückansicht,
Figur 3
einen Vertikalschnitt durch die Werkzeugkombination gemäß Figur 1 bzw. 2,
Figur 4
den Meißelhalter gemäß der Werkzeugkombination nach Figur 1 bis 3 in perspektivischer Frontansicht,
Figur 5
den Meißelhalter gemäß Figur 4 in Rückansicht,
Figur 6
einen Vertikalschnitt durch den Meißelhalter gemäß Figur 4 bzw. 5,
Figur 7
eine perspektivische Aufsicht auf den Meißelhalter gemäß den Figuren 1 bis 3, und
Figur 8
einen Vertikalschnitt durch den Meißelhalter gemäß Figur 7.
The invention will be explained in more detail below with reference to an embodiment shown in the drawings. Show it:
FIG. 1
a tool combination with a base part and a chisel holder in a perspective front view,
FIG. 2
the tool combination according to FIG. 1 in perspective rear view,
FIG. 3
a vertical section through the tool combination according to FIG. 1 or 2,
FIG. 4
the chisel holder according to the tool combination Figure 1 to 3 in a perspective front view,
FIG. 5
according to the chisel holder FIG. 4 in rear view,
FIG. 6
a vertical section through the bit holder according to FIG. 4 or 5,
FIG. 7
a perspective view of the bit holder according to the FIGS. 1 to 3 , and
FIG. 8
a vertical section through the bit holder according to FIG. 7 ,

Figur 1 zeigt ein Basisteil 10, das eine Unterseite 11 mit konkav gewölbten Aufsatzflächen aufweist. Mittels dieser Aufsatzflächen kann das Basisteil auf den zylindrischen Außenmantel einer Fräswalze aufgesetzt und daran fest geschweißt werden. Mit dem Basisteil 10 ist ein Meißelhalter 20 verbunden. FIG. 1 shows a base member 10 having a bottom 11 with concave top surfaces. By means of this attachment surfaces, the base part can be placed on the cylindrical outer shell of a milling drum and welded firmly. A bit holder 20 is connected to the base part 10.

Wie die Figur 3 zeigt, weist das Basisteil 10 eine Steckaufnahme 15 auf, die einen Steckansatz 21 des Meißelhalters 20 aufnimmt. Nachfolgend wird unter Bezugnahme auf die Figuren 4 bis 6 die Ausgestaltung des Meißelhalters 20 näher erläutert.As the FIG. 3 shows, the base part 10 on a plug-in receptacle 15 which receives a plug 21 of the chisel holder 20. Below is under Reference to the FIGS. 4 to 6 the design of the bit holder 20 explained in more detail.

Wie die Figur 4 zeigt, weist der Meißelhalter 20 den Steckansatz 21 auf, an den winklig ein Halteansatz 25 angeschlossen ist. Dabei ist idealerweise zwischen dem Steckansatz 21 und dem Halteansatz 25 ein stumpfer Winkel eingeschlossen. Der Steckansatz 21 bildet im Bereich seiner, in Werkzeugvorschubrichtung (v) gewandten Steckansatzvorderseite 22 eine Frontfläche 21.1. In diese Frontfläche 21.1 sind zwei Aussparungen derart eingetieft, dass sie Druckflächen 21.2 bilden. Die Druckflächen 21.2 sind dabei im Winkel zur Längsachse des Steckansatzes 21 angeordnet. Der die Druckfläche 21.2 tragende Vorsprung des Steckansatzes 21 geht über seitliche Übergangsabschnitte 21.3 in Seitenflächen 21.4 über. Dabei sind die Seitenflächen 21.4 in Richtung der Werkzeugvorschubrichtung (v) ausgerichtet und weisen zu den Werkzeugseiten. Wie die Figur 5 erkennen lässt, gehen die Seitenflächen 21.4 im Bereich der Steckansatzrückseite 23 in Lagerflächen 21.5 über. Dabei stehen die Lagerflächen 21.5 zueinander im Winkel. Die Lagerflächen 21.5 wiederum sind mittels einer Übergangsfläche 21.6 verbunden und weisen entgegengesetzt zur Vorschubrichtung v.As the FIG. 4 shows, the bit holder 20, the plug approach 21, at the angle of a holding lug 25 is connected. Ideally, an obtuse angle is included between the plug 21 and the retaining lug 25. The plug-in projection 21 forms in the region of its, in the tool feed direction (v) facing plug approach front 22 a front surface 21.1. In this front surface 21.1 two recesses are recessed so that they form pressure surfaces 21.2. The pressure surfaces 21.2 are arranged at an angle to the longitudinal axis of the plug-in projection 21. The pressure surface 21.2 bearing projection of the plug 21 passes through lateral transition sections 21.3 in side surfaces 21.4 over. In this case, the side surfaces 21.4 are aligned in the direction of the tool feed direction (v) and point to the tool sides. As the FIG. 5 can recognize the side surfaces go 21.4 in the area of the plug projection rear side 23 in bearing surfaces 21.5 over. The storage areas 21.5 are at an angle to each other. The bearing surfaces 21.5 in turn are connected by means of a transition surface 21.6 and have opposite to the feed direction v.

Der Halteansatz 25 ist mit einer Meißelaufnahme 26 in Form einer zylindrischen Bohrung versehen. Die Mittellängsachse M der Meißelaufnahme 26 und die Längsachse L des Steckansatzes 21 schließen idealerweise einen Winkel im Bereich zwischen 100° und 160°, vorzugsweise 130° ein. Die Meißelaufnahme 26 geht über eine Einführerweiterung 27 in eine Auflagefläche 25.3 über. Dabei verläuft die Auflagefläche 25.3 radial zur Meißelaufnahme 26. Der Meißelaufnahme 26 abgekehrt geht die Auflagefläche 25.3 in eine Querschnittsverjüngung 25.1 über. Die Querschnittsverjüngung 25.1 ist in Form eines Stumpfkegels ausgebildet und leitet die Mantelfläche (25.2) des Meißelhalters 20 in die Auflagefläche 25.3 über. Der Halteansatz 25 weist im Bereich unterhalb der Meißelaufnahme 26 zwei Stützflächen 29 auf, die zueinander V-förmig im Winkel angestellt sind. Dabei weisen, wie die Figur 6 erkennen lässt, die Stützflächen 29 aufgrund ihrer schrägen Anstellung in Richtung auf das freie Ende des Steckansatzes und gleichzeitig in Vorschubrichtung (v) und verlaufen, wie in Figur 3 dargestellt, parallel oder im Wesentlichen parallel zur Mittellängsachse M der Meißelaufnahme 26. Wie die Figur 5 erkennen lässt, besitzt der Halteansatz 25 seitliche Verbreiterungen 28, in denen die Stützflächen 29 auslaufen. Die Stützflächen 29 und die Lagerflächen 21.5 sind in einander entgegengesetzte Richtungen weisend orientiert.The retaining lug 25 is provided with a bit holder 26 in the form of a cylindrical bore. The central longitudinal axis M of the bit receptacle 26 and the longitudinal axis L of the plug-in projection 21 ideally include an angle in the range between 100 ° and 160 °, preferably 130 °. The bit receptacle 26 merges via an introducer extension 27 into a bearing surface 25.3. In this case, the support surface 25.3 extends radially to the chisel receiver 26. The chisel holder 26 faces away from the support surface 25.3 in a cross-sectional taper 25.1. The cross-sectional taper 25.1 is designed in the form of a truncated cone and leads the lateral surface (25.2) of the chisel holder 20 into the bearing surface 25.3. The retaining lug 25 has in the region below the bit holder 26 two support surfaces 29, which are employed in an angle to each other in a V-shape. Show how the FIG. 6 can recognize the support surfaces 29 due to their oblique position in the direction of the free end of the plug-in approach and at the same time in the feed direction (v) and run, as in FIG. 3 represented, parallel or substantially parallel to the central longitudinal axis M of the bit holder 26. Like the FIG. 5 can recognize, has the retaining lug 25 lateral widening 28 in which the support surfaces 29 expire. The support surfaces 29 and the bearing surfaces 21.5 are oriented pointing in opposite directions.

Nachfolgend wird unter Bezugnahme auf die Figuren 7 und 8 die Gestaltung des Basisteils 10 näher erläutert.The following is with reference to the FIGS. 7 and 8 the design of the base part 10 explained in more detail.

Das Basisteil 10 weist eine Steckaufnahme 15 auf, die in ihrem Querschnitt an die Außenkontur des Steckansatzes 21 des Meißelhalters 20 angepasst ausgebildet ist. Frontseitig wird die Steckaufnahme 15 mittels eines Stützansatzes 12 begrenzt. In den Stützansatz 12 ist eine Schraubaufnahme 13 als Gewinde eingearbeitet. Die Schraubaufnahme 13 mündet in die Steckaufnahme 15. Der Steckaufnahme 15 abgekehrt läuft die Schraubaufnahme 13 in einer Bohrungserweiterung 13.1 aus. Der Stützansatz 12 weist in seinem oberen, radial außenliegenden Bereich ein Auflager 18 auf, das von zwei Stützflächen 18.1 gebildet ist. Die beiden Stützflächen 18.1 sind zueinander im Winkel angestellt. Die Winkelausrichtung der Stützflächen 18.1 ist auf die Ausrichtung der Stützflächen 29 des Meißelhalters 20 angepasst, sodass die Stützflächen 29 des Meißelhalters 20 planparallel auf den Stützflächen 18.1 des Basisteils 10 aufliegen können. Die Stützflächen 18.1 sind zum Zwecke der definierten Anlage des Meißelhalters 20 über einen zurückversetzten Absatz 18.4 miteinander verbunden.The base part 10 has a plug-in receptacle 15 which is adapted in its cross-section to the outer contour of the plug-in projection 21 of the bit holder 20. Front side, the plug-in receptacle 15 is limited by means of a support projection 12. In the support lug 12, a screw 13 is incorporated as a thread. The screw receptacle 13 opens into the plug-in receptacle 15. The plug receptacle 15 faces away from the screw receptacle 13 in a bore enlargement 13.1. The support lug 12 has in its upper, radially outer region on a support 18 which is formed by two support surfaces 18.1. The two support surfaces 18.1 are employed at an angle to each other. The angular orientation of the support surfaces 18.1 is adapted to the orientation of the support surfaces 29 of the chisel holder 20, so that the support surfaces 29 of the chisel holder 20 can rest plane-parallel on the support surfaces 18.1 of the base member 10. The support surfaces 18.1 are for the purpose of the defined investment of the bit holder 20 via a recessed paragraph 18.4 connected to each other.

Rückseitig wird die Steckaufnahme 15 von einem Gegenlager 16 begrenzt. Das Gegenlager 16 ist dabei Teil eines rückwärtigen Ansatzes 17, der entgegen der Vorschubrichtung (v) über die Steckaufnahme 15 vorsteht. Das Gegenlager 16 wird dabei von zwei weiteren Stützflächen 16.1 gebildet, die zueinander im Winkel stehen.On the rear side, the plug-in receptacle 15 is delimited by an abutment 16. The anvil 16 is part of a rear projection 17 which protrudes counter to the feed direction (v) via the plug-in receptacle 15. The anvil 16 is formed by two further support surfaces 16.1, which are at an angle to each other.

Diese weiteren Stützflächen 16.1 sind wieder in ihrer Ausgestaltung und räumlichen Anordnung auf die Lagerflächen 21.5 des Meißelhalters 20 angepasst ausgebildet, sodass eine planparallele Anlage der weiteren Lagerflächen 21.5 an den Stützflächen 16.1 möglich ist. Gegenüberliegend der Stützflächen 18.1 ist die Steckaufnahme 15 von einer Freifläche 18.2 begrenzt. In Werkzeugvorschubrichtung (v) wird die Steckaufnahme 15 von zwei seitlichen Verbindungsabschnitten 19 begrenzt. Die von den Verbindungsabschnitten 19 gebildeten, der Steckaufnahme 15 zugewandten Innenflächen gehen über Freiflächen 18.5 in Wandungen 18.6 über, die wiederum in Werkzeugvorschubrichtung (v) orientiert sind. Die Wandungen 18.6 wiederum laufen in der Freifläche 18.2 aus. Wie die Figur 7 deutlich erkennen lässt, ist in den Ansatz 17 eine Aussparung 17.1 eingetieft.These further support surfaces 16.1 are again adapted in their design and spatial arrangement adapted to the bearing surfaces 21.5 of the bit holder 20, so that a plane-parallel contact the other bearing surfaces 21.5 on the support surfaces 16.1 is possible. Opposite the support surfaces 18.1, the plug-in receptacle 15 is bounded by an open space 18.2. In the tool feed direction (v), the plug-in receptacle 15 is bounded by two lateral connecting sections 19. The inner surfaces formed by the connecting sections 19 and facing the plug-in receptacle 15 pass over open spaces 18.5 into walls 18.6, which in turn are oriented in the tool feed direction (v). The walls 18.6 turn out in the open space 18.2. As the FIG. 7 can be clearly seen, is recessed into the projection 17 a recess 17.1.

Die Montage des Meißelhalters 20 an dem Basisteil 10 wird wie folgt vorgenommen.The mounting of the bit holder 20 on the base part 10 is carried out as follows.

Zunächst wird der Meißelhalter 20 mit seinem Steckansatz 21 in die Steckaufnahme 15 des Basisteils 10 eingeschoben. Wie die Figur 3 erkennen lässt, wird dann als Befestigungselement 14 ein Gewindestift in die Schraubaufnahme 13 eingeschraubt. Das Befestigungselement 14 weist eine rechtwinklig zur Schraubachse orientierte Andrückfläche auf, die an der Druckfläche 21.2 des Meißelhalters 20 zur Anlage kommt. Dabei muss die Andrückfläche keine ebene Fläche sein, sondern kann auch eine sphärische Fläche sein. Die Figur 1 lässt erkennen, dass zur Befestigung des Meißelhalters 20 zwei Befestigungselemente 14 verwendet sind, mithin also auch zwei Schraubaufnahmen 13 in das Basisteil 10 eingearbeitet sind. Bei einer Verspannung der Befestigungselemente 14 drückt das Befestigungselement 14 auf die Druckfläche 21.2. Aufgrund der winkligen Anstellung der Druckfläche 21.2 zur Mittellängsachse des Steckansatzes 21 übt das Befestigungselement 14 eine Einzugkraft auf den Steckansatz 21 aus. Gleichzeitig wird eine Kraftkomponente erzeugt, die entgegengesetzt zur Vorschubrichtung (v) verläuft und den Steckansatz 21 in das Gegenlager 16 presst. Die in Richtung der Längsachse des Steckansatzes 21 verlaufende Kraftkomponente bringt die Stützflächen 18.1 des Auflagers 18 mit den Stützflächen 29 des Meißelhalters 20 zur Anlage. Eine Verspannung der Befestigungselemente 14 bewirkt nun, wie dies insbesondere aus der Figur 3 deutlich erkennbar ist, dass der Meißelhalter 20 beidseitig der Mittellängsachse des Steckansatzes 21 eine Abstützung erfährt. Zum Einen ist die Abstützung am Gegenlager 16 rückseitig der Mittellängsachse und zum Anderen am Auflager 18 vorderseitig der Mittellängsachse vorgenommen. Die Befestigungsschraube 14 wirkt nun so auf den Steckansatz 21 ein, dass eine Verspannung des Meißelhalters 20 an dem Auflager 18 und dem Gegenlager 16 stattfindet. Auf diese Weise wird eine sichere und unverlierbare Befestigung des Meißelhalters 20 garantiert.First, the bit holder 20 is inserted with its plug 21 in the socket 15 of the base member 10. As the FIG. 3 can recognize, is then screwed as a fastener 14, a threaded pin in the screw 13. The fastening element 14 has a pressure surface oriented at right angles to the screw axis, which abuts the pressure surface 21. 2 of the chisel holder 20. The pressure surface does not have to be a flat surface, but can also be a spherical surface. The FIG. 1 shows that two fastening elements 14 are used for fastening the chisel holder 20, thus also two screw receptacles 13 are incorporated into the base part 10. When the fastening elements 14 are braced, the fastening element 14 presses against the pressure surface 21.2. Due to the angular position of the pressure surface 21.2 to the central longitudinal axis of the plug 21, the fastener 14 exerts a pull-in force on the plug 21. At the same time a force component is generated, which is opposite to the feed direction (v) and presses the plug 21 in the counter-bearing 16. The extending in the direction of the longitudinal axis of the plug 21 force component brings the support surfaces 18.1 of the support 18 with the support surfaces 29 of the chisel holder 20 to the plant. A tension of the fasteners 14 now causes, as in particular from FIG. 3 clearly recognizable that the bit holder 20 experiences a support on both sides of the central longitudinal axis of the plug-in projection 21. On the one hand, the support on the anvil 16 is made on the rear side of the central longitudinal axis and on the other on the support 18 on the front side of the central longitudinal axis. The fastening screw 14 now acts on the insertion projection 21 such that a tensioning of the bit holder 20 takes place on the support 18 and the abutment 16. In this way, a secure and captive attachment of the chisel holder 20 is guaranteed.

Figur 3 lässt weiterhin erkennen, dass in die Bohrungserweiterung 13.1 der Schraubaufnahme 13 ein Abdeckelement 14.1 eingesetzt werden kann, das die Werkzeugaufnahme des Befestigungselementes 14 abdeckt. FIG. 3 can further recognize that in the bore extension 13.1 of the screw 13, a cover 14.1 can be used, which covers the tool holder of the fastener 14.

Sowohl das Basisteil 10 als auch der Meißelhalter 20 sind im Wesentlichen spiegelsymmetrisch zu der in Vorschubrichtung (v) verlaufenden Mittelquerebene dieser jeweiligen Bauteile ausgebildet. Damit wird eine gleichmäßige Lastabtragung begünstigt.Both the base part 10 and the bit holder 20 are formed substantially mirror-symmetrically to the transverse direction of the medium (in the transverse direction) of these respective components. This promotes a uniform load transfer.

Während des Betriebseinsatzes greift ein in die Meißelaufnahme 26 eingesetzter Rundschaftmeißel üblicher Bauweise in das abzutragende Gut, beispielsweise ein Kohleflöz ein. Bei diesem Eingriff wird vornehmlich die Abstützung, bestehend aus Auflager 18 und Stützflächen 29 beansprucht. Während des Werkzeugeingriffes wird auch infolge des Vorschubes (v) der Meißelhalter 20 in das Gegenlager 16 gepresst. Die großflächige Anlage des Meißelhalters 20 dort garantiert eine sichere Kraftableitung.During operational use engages a used in the bit holder 26 round shank chisel conventional construction in the material to be removed, for example, a coal seam. In this intervention, primarily the support, consisting of support 18 and support surfaces 29 claimed. During the tool engagement, the bit holder 20 is also pressed into the counter bearing 16 as a result of the advance (v). The large area of the chisel holder 20 there guarantees a safe power dissipation.

Wie Figur 3 erkennen lässt, wird eine eindeutige Zuordnung des Meißelhalters 20 zum Basisteil 10 insbesondere dadurch garantiert, dass nur eine Auflage an diesen beiden vor erwähnten zentralen Stützstellen stattfindet (Auflager 18 und Gegenlager 16). Im Bereich des Absatzes 18.4, der Freifläche 18.2, der Wandungen 18.6 der Freiflächen 18.5 sowie des Verbindungsabschnittes 19 ist der Steckansatz 21 von der Steckaufnahme 15 freigestellt. Wenn nun im Laufe des Einsatzes des Basisteils 10 beispielsweise eine Abnutzung der Stützflächen 18.1 stattfindet, so bildet der Absatz 18.4 einen Rücksetzraum. Die Beabstandung des Meißelhalters 20 von dem Absatz 18.4 garantiert ein Nachsetzen des Meißelhalters 20 im Verschleißfall. Dabei kann ein Verschleißausgleich insbesondere deswegen stattfinden, weil die Stützflächen 18.1 und die weiteren Stützflächen 16.1 Gleitführungen bilden, an denen der Meißelhalter 20 beim Nachspannen entlang rutschen kann. Diese Ausgestaltung ist insbesondere dann von Vorteil, wenn das Basisteil 10, wie dies üblicherweise gefordert ist, eine Standzeit aufweist, die mehrere Lebenszyklen von Meißelhaltern 20 andauert. Unverschlissene Meißelhalter 20 können dann stets auch noch an einem teilverschlissenen Basisteil 10 sicher verspannt und gehalten werden.As FIG. 3 can recognize a unique assignment of the bit holder 20 to the base part 10 in particular guaranteed by the fact that only one edition of these two above-mentioned central support points takes place (support 18 and thrust bearing 16). In the area of paragraph 18.4, the free space 18.2, the walls 18.6 of the open spaces 18.5 and the connecting portion 19 of the plug 21 is released from the socket 15. If, for example, a wear of the support surfaces 18.1 takes place in the course of the use of the base part 10, the paragraph 18.4 forms a reset space. The spacing of the bit holder 20 from the paragraph 18.4 guarantees a repositioning of the bit holder 20 in case of wear. In this case, a wear compensation in particular take place because the support surfaces 18.1 and the other support surfaces 16.1 form sliding guides on which the bit holder 20 can slide along during retightening. This embodiment is particularly advantageous if the base part 10, as is usually required, has a service life that lasts several life cycles of bit holders 20. Unworn bit holder 20 can then always be securely clamped and held even on a partially worn base part 10.

Während des Betriebseinsatzes wird von dem eingebauten Rundschaftmeißel Abraummaterial abgebaut, das am Meißelhalter 20 im Bereich der Mantelfläche 25.2 abgleitet. Dieses Abraummaterial wird über die Verbreiterungen 28 nach Außen geleitet, wodurch ein Schutz des Basisteils 10 vor dem abrasiven Angriff dieses Abraummateriales bewirkt ist.During the operational use of the built-in round shank chisel material is degraded, which slides on the bit holder 20 in the region of the lateral surface 25.2. This space material is passed through the spacers 28 to the outside, whereby a protection of the base member 10 is effected before the abrasive attack of this space material.

Wenn ein Rundschaftmeißel verschlissen ist, dann kann dieser einfach ausgetauscht werden. Dies wird möglich, da die Aussparungen 17.1 im Basisteil 10 zusammen mit der Ausnehmung 24 im Meißelhalter 20 eine Werkzeugaufnahme bilden. In diese kann ein Ausdrückwerkzeug eingesetzt werden, das auf die Rückseite des Rundschaftmeißels einwirkt und diesen aus der Meißelaufnahme 26 ausschiebt. Wie Figur 5 erkennen lässt, steht die Meißelaufnahme 26 in räumlicher Verbindung mit der Ausnehmung 24.If a pick has worn out, it can be easily replaced. This is possible because the recesses 17.1 in the base part 10 together with the recess 24 in the bit holder 20 form a tool holder. In this a Ausdrückwerkzeug can be used, which acts on the back of the round shank chisel and this pushes out of the bit holder 26. As FIG. 5 can be seen, the bit holder 26 is in spatial communication with the recess 24th

Claims (17)

  1. A pick holder having a plug attachment (21) and a retaining attachment (25), wherein the retaining attachment (25) comprises a pick receptacle (26), and wherein the retaining attachment (25) protrudes at least in some regions from or beyond the plug attachment (21) in the tool feed direction (v),
    wherein
    the retaining attachment (25) comprises a rigid, integrally formed support section having at least one support surface (29), which is arranged at least in some regions in front of the plug attachment (21) in the feed direction,
    and wherein the support section comprises two support surfaces (29), which are at an angle with respect to one another,
    characterised in that
    the plug attachment (21) in the region of the plug attachment rear side (23) thereof, facing away from the tool feed direction (v), comprises a further support section having a bearing surface (21.5).
  2. A pick holder having a plug attachment (21) and a retaining attachment (25), wherein the retaining attachment (25) comprises a pick receptacle (26), and wherein the retaining attachment (25) protrudes at least in some regions from or beyond the plug attachment (21) in the tool feed direction (v),
    wherein the retaining attachment (25) comprises a rigid, integrally formed support section having a support surface (29), which is arranged at least in some regions in front of the plug attachment (21) in the feed direction,
    characterised in that
    the plug attachment (21) in the region of the plug attachment rear side (23) thereof, facing away from the tool feed direction (v), comprises a further support section having two bearing surfaces (21.5), which are at an angle with respect to one another.
  3. The pick holder according to claim 2,
    characterised in that
    the support section comprises two support surfaces (29), which are at an angle with respect to one another.
  4. The pick holder according to one of claims 1 to 3,
    characterised in that
    the support surfaces (29) are arranged on both sides of the central transverse plane extending through the central longitudinal axis of the pick receptacle (26) and in the direction of the longitudinal extension of the plug attachment (21).
  5. The pick holder according to one of claims 1 to 4,
    characterised in that
    the supporting surface (29) or supporting surfaces (29) form a sliding guide.
  6. The pick holder according to one of claims 1 to 4,
    characterised in that
    the support surface(s) (29) is (are) part of a widening (28), which protrudes beyond the pick holder (26) in a direction transverse to the central longitudinal axis of the pick receptacle (26).
  7. The pick holder according to one of claims 1 to 6,
    characterised in that
    that the plug attachment (21) in the region of the plug attachment front side (22) thereof facing in the tool feed direction (v) comprises at least one pressure surface (21.2), which is arranged at an angle of less than 90°, preferably less than 80°, with respect to the central longitudinal axis of the plug attachment (21).
  8. The pick holder according to one of claims 1 to 7,
    characterised in that
    the pick receptacle (26) counter to the feed direction merges into a recess (24), which is opened radially outwardly and transversely with respect to the tool feed direction (v).
  9. The pick holder according to one of claims 1 and 3 to 8,
    characterised in that
    the plug attachment (21) in the region of the plug attachment rear side (23) thereof, facing away from the tool feed direction (v), comprises the further support section having a plurality of bearing surfaces (21.5).
  10. The pick holder according to one of claims 2 to 8,
    characterised in that
    the plug attachment (21) in the region of the plug attachment rear (23) thereof, facing away from the tool feed direction (v), comprises the further support section having three or a plurality of bearing surfaces (21.5).
  11. The pick holder according to one of the preceding claims,
    characterised in that
    the bearing surfaces (21.5) are at an angle with respect to one another.
  12. The pick holder according to one of the preceding claims,
    characterised in that
    the bearing surfaces (21.5) extend substantially in the direction of the longitudinal axis of the plug attachment (21).
  13. A base part for receiving a pick holder according to one of claims 1 to 12, having a plug receptacle (15) and a support attachment (12), which forms a support (18), wherein the support attachment (12) is arranged in front of the plug receptacle (15) in the tool feed direction (v) and the support (18) is arranged in front of the plug receptacle (15), characterised in that
    counter to the tool feed direction (v) an attachment (17) is arranged behind the plug receptacle (15), and holds at least one counter-bearing (16) in the region of the plug receptacle (16),
    wherein the support (18) comprises two support surfaces (18.1) and the counter-bearing (16) comprises two further supporting surfaces (16.1), which are each at an angle with respect to one another.
  14. The base part according to claim 13,
    characterised in that
    the support (18) forms a support surface (18.1), which encloses an obtuse angle with the longitudinal axis of the plug receptacle (15) or the further support surface (16.1) of the counter-bearing (16)
  15. The base part according to one of claims 13 or 14,
    characterised in that
    the support attachment (12) in the tool feed direction (v) in front of the plug receptacle (15) comprises a screw receptacle (13), which leads into the region of the plug receptacle (15).
  16. A tool arrangement having a pick holder (20) according to one of claims 1 to 12 and a base part (20) according to one of claims 13 to 15.
  17. The tool arrangement having a pick holder (20) according to one of claims 1 to 12 and a base part (20), which is designed to receive the pick holder (20) and to support same on the support surface(s) (29) and the bearing surface(s) (21.5).
EP10188978.0A 2009-12-17 2010-10-27 Pick holder and base section Active EP2336488B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009059188A DE102009059188A1 (en) 2009-12-17 2009-12-17 Chisel holder and base part

Publications (3)

Publication Number Publication Date
EP2336488A2 EP2336488A2 (en) 2011-06-22
EP2336488A3 EP2336488A3 (en) 2016-06-29
EP2336488B1 true EP2336488B1 (en) 2019-05-15

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US (1) US8746806B2 (en)
EP (1) EP2336488B1 (en)
JP (1) JP5425047B2 (en)
KR (1) KR101388232B1 (en)
CN (3) CN106089199B (en)
AU (1) AU2010246502B2 (en)
CA (1) CA2722823C (en)
DE (1) DE102009059188A1 (en)
RU (1) RU2457327C1 (en)
TW (1) TWI470148B (en)

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Also Published As

Publication number Publication date
JP2011126002A (en) 2011-06-30
AU2010246502A1 (en) 2011-07-07
EP2336488A3 (en) 2016-06-29
CN102102516B (en) 2016-08-31
CN106089199A (en) 2016-11-09
EP2336488A2 (en) 2011-06-22
CN202081892U (en) 2011-12-21
US8746806B2 (en) 2014-06-10
US20110148178A1 (en) 2011-06-23
RU2457327C1 (en) 2012-07-27
KR20110069719A (en) 2011-06-23
TWI470148B (en) 2015-01-21
CN102102516A (en) 2011-06-22
KR101388232B1 (en) 2014-04-25
AU2010246502B2 (en) 2012-10-25
TW201124607A (en) 2011-07-16
CN106089199B (en) 2019-10-01
CA2722823A1 (en) 2011-06-17
CA2722823C (en) 2015-01-13
DE102009059188A1 (en) 2011-06-22
JP5425047B2 (en) 2014-02-26

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