EP4008877B1 - Drilling drive device for an earth boring machine - Google Patents

Drilling drive device for an earth boring machine Download PDF

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Publication number
EP4008877B1
EP4008877B1 EP20212287.5A EP20212287A EP4008877B1 EP 4008877 B1 EP4008877 B1 EP 4008877B1 EP 20212287 A EP20212287 A EP 20212287A EP 4008877 B1 EP4008877 B1 EP 4008877B1
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EP
European Patent Office
Prior art keywords
spindle unit
drive device
spring
drill drive
drilling
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
EP20212287.5A
Other languages
German (de)
French (fr)
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EP4008877A1 (en
EP4008877C0 (en
Inventor
Tobias Moscaritolo
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.)
Eurodrill GmbH
Original Assignee
Eurodrill GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to RS20230709A priority Critical patent/RS64474B1/en
Application filed by Eurodrill GmbH filed Critical Eurodrill GmbH
Priority to PL20212287.5T priority patent/PL4008877T3/en
Priority to HRP20231003TT priority patent/HRP20231003T1/en
Priority to ES20212287T priority patent/ES2954753T3/en
Priority to EP20212287.5A priority patent/EP4008877B1/en
Priority to HUE20212287A priority patent/HUE062539T2/en
Priority to KR1020210170882A priority patent/KR20220080712A/en
Priority to JP2021196034A priority patent/JP7235843B2/en
Priority to CN202111458312.3A priority patent/CN114592792A/en
Priority to CA3141025A priority patent/CA3141025A1/en
Priority to US17/544,519 priority patent/US11719045B2/en
Publication of EP4008877A1 publication Critical patent/EP4008877A1/en
Application granted granted Critical
Publication of EP4008877B1 publication Critical patent/EP4008877B1/en
Publication of EP4008877C0 publication Critical patent/EP4008877C0/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B6/00—Drives for drilling with combined rotary and percussive action
    • E21B6/02—Drives for drilling with combined rotary and percussive action the rotation being continuous
    • E21B6/04—Separate drives for percussion and rotation
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E21B4/14—Fluid operated hammers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/003—Bearing, sealing, lubricating details
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B6/00—Drives for drilling with combined rotary and percussive action
    • E21B6/02—Drives for drilling with combined rotary and percussive action the rotation being continuous
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/24—Drilling using vibrating or oscillating means, e.g. out-of-balance masses

Definitions

  • the invention relates to a drilling drive device for an earth drilling device with a spindle arrangement which has an inner spindle unit and an outer spindle unit which is mounted in an axially displaceable manner on the inner spindle unit and is floating between two spring devices, according to the preamble of claim 1.
  • Such drilling drive devices are known in particular in drilling devices for earth and rock drilling, in which a down-the-hole-hammer drilling unit is used as a drilling tool.
  • a down-the-hole-hammer drilling unit one or more axially driven percussion elements are provided, which additionally execute a percussive movement when the down-the-hole-hammer drilling unit is driven in rotation.
  • Such down-the-hole hammer drilling units can be used in particular to create a borehole in rock.
  • a down the hole hammer unit goes about from the EP 3 336 301 A1 out.
  • the further operation of the drive spindle is influenced by such a bearing.
  • a certain amount of axial play must also be provided in order to allow axial screwing in a drill string composed of several drill rods with threaded connections.
  • CN 85 100 828 A discloses a drilling drive device with a spindle unit arranged in a floating manner between two disk springs.
  • the invention is based on the object of specifying a drilling drive device which, on the one hand, enables efficient drilling operation and, on the other hand, a good protection of the drilling drive when using an axially percussive drilling tool.
  • the drilling drive device is characterized in that a first front spring device, which is arranged on one side of the drilling tool, comprises a combination of at least one spiral compression spring and a first plate spring arrangement, and that a second rear spring device, which faces away from the drilling tool side, has a second plate spring arrangement.
  • a basic idea of the invention is to provide a floating bearing between two spring prestressing devices between the outer spindle unit and the inner spindle unit.
  • a first front spring device which faces the side with the drilling tool
  • a second rear spring device which faces away from the drilling tool side
  • each have a disk spring arrangement.
  • the torque is preferably introduced via the outer spindle unit, so that, due to the lack of storage, shocks from the inner spindle unit cannot be transmitted to the outer spindle unit, or can only be transmitted in a greatly dampened manner. Conversely, torque can also be transmitted from a drilling drive first to the inner spindle unit, while the drilling tool is connected to the outer spindle unit directly or via a drill rod.
  • At least one spiral compression spring is arranged on the first front spring device in addition to the first disk spring arrangement.
  • the preferably relatively soft spiral compression spring allows it in particular, a slight relative displacement between the two spindle units, which is advantageous, for example, when screwing on drill rod elements with threaded connections. Overall, efficient drilling operation can be achieved with simultaneous good damping of impacts from the drilling tool on the drilling drive.
  • a preferred embodiment of the invention consists in the spiral compression spring of the first spring device being supported on the one hand on a radially outwardly directed first flange on the outside of the inner spindle unit and on the other hand on a support ring which is resiliently mounted on the outer spindle unit in an axially displaceable manner by the disk spring arrangement .
  • the flange may be integral with or attached to the inner spindle unit on the outside.
  • a further expedient embodiment of the drilling drive device according to the invention results from the fact that the second disc spring arrangement of the second rear spring device is supported on the one hand on a radially outwardly directed second flange of the inner spindle unit and on the other hand on the outer spindle unit. At least one of the radially outwardly directed flanges is detachably attached. Overall, this enables the spring arrangement to be easily assembled.
  • a torque transmission device in particular an axial splined shaft toothing, is arranged.
  • the torque transmission device is designed to transmit a torque from a drive wheel of a drilling drive to the spindle arrangement.
  • the torque transmission device can be formed on the inner spindle unit or the outer spindle unit.
  • the torque transmission device is preferably arranged between the front spring device and the rear spring device. This counteracts excessive loading of a drilling drive by axial impacts during drilling.
  • the disk spring arrangements can be of any design.
  • a particularly low-maintenance embodiment results from the fact that the first disk spring arrangement and/or the second disk spring arrangement are accommodated in a receiving pocket.
  • the receiving pocket can be formed in particular on one of the flanges.
  • the receiving pocket is in particular an annular receiving groove.
  • a connecting device for attaching a drill rod element is provided on a front side of the inner spindle unit.
  • a thread can be provided, to which a suitable threaded area of a drill rod element is screwed.
  • the spiral compression spring has a smaller spring constant and a greater spring deflection than that of the first disc spring arrangement.
  • the spiral compression spring can thus ensure a necessary axial play, which is desired for attaching drill rod elements.
  • the spring deflection of the spiral compression spring is equal to or greater than a thread length of a drill rod element to be attached with a connecting thread.
  • annular guide slot to be formed on the inner spindle unit, in which a sleeve-shaped guide projection of the outer spindle unit fits. This ensures a guided movement between the two spindle units.
  • the invention also includes a drilling device, in particular an earth drilling device, with at least one drilling drive, with an outer spindle unit of a drilling drive device according to the invention being driven by the drilling drive.
  • the drilling device can in particular be a pile drilling device, which is used to produce foundation piles in the ground. Any one can Drilling tools are used, such as an auger, an endless drill, a drilling bucket or the like.
  • a down-the-hole hammer unit is attached to a drill rod as a drilling tool, which can be driven in rotation by means of the drill drive device.
  • a down-the-hole-hammer unit is basically known from the prior art. This has a generally cylindrical base body, on the underside of which is directed towards the ground, one or more hammer elements are driven in an axially reversing manner.
  • the hammer elements can be driven axially in particular by supplying a pressure fluid, in particular compressed air.
  • the spindle arrangement and in particular the inner spindle unit can be tubular with an inner cavity through which corresponding lines can be routed.
  • a drilling drive device 10 which in the Figures 1 to 3 is shown is essentially composed of an inner spindle unit 20 with a tubular base body 22 with an inner channel 23 and a tubular outer spindle unit 40 which is coaxial to the inner spindle unit 20 and surrounds it.
  • a central torque transmission device 70 in a basically known manner via one or more drill drives 5, which are preferably hydraulically driven, a torque on the outer Spindle unit 40 and / or the inner spindle unit 20 transferred.
  • the inner spindle unit 20 extends through the ring-shaped torque transmission device 70 to the rear and, at its rear end facing away from a drilling tool, has a rotary feedthrough 12 for transmitting at least one fluid from a drilling device (not shown) into the inner channel 23 of the tubular inner spindle unit 20 on.
  • the rotary feedthrough 12 essentially has two main components, namely a rotor 14, which is non-rotatably connected to the inner spindle unit 20 and a stator 16 facing away from it to the rear, which is supported on a housing of the torque transmission device 70 via a torque arm 18.
  • the rotor 14 rotates relative to the stationary stator 16, to which a fluid line, such as for transferring a mud or drilling suspension, can be connected.
  • the outer spindle unit 40 rotates with the inner spindle unit 20, which is mounted so that it can be displaced axially relative to the outer spindle unit 40.
  • a radially outwardly directed first flange 24 is arranged on a front side of the inner spindle unit 20 directed toward a borehole, to which a drilling tool can be detachably fastened directly or indirectly via attached drill rod elements by means of a connecting device 25 .
  • the drilling tool can in particular be a down-the-hole hammer drilling unit which has one or more axially driven percussion elements.
  • the drilling drive device 10 is provided with a first spring device 50 and a second spring device 60, which are described in more detail below with reference to FIG figures 2 and 3 be described in more detail.
  • the first spring device 50 has two spring components, namely a spiral compression spring 52 and a first disc spring arrangement 54.
  • the spiral compression spring 52 which is coaxial to the drilling axis, is supported at the front on the first flange 24 on the tubular base body 22 of the inner spindle unit 20 and on the other hand on a support ring 30 .
  • the support ring 30 can have a first ring 31 and a second ring 32 .
  • the first ring 31 is slidably mounted on the outside of the inner spindle unit 20 and is resiliently supported relative to the outer spindle unit 40 by means of the coaxial first disk spring arrangement 54, with the first disk spring arrangement 54 exerting a first prestressing force F TF is exercised.
  • the first ring 31 is connected to the second ring 32 via a radially protruding stop, on which the other end of the spiral compression spring 52 is supported on a step-like shoulder, with a pretensioning force F DF acting on the first flange 24 and thus the first inner spindle unit 20 is exercised.
  • the spiral compression spring 52 enables a stroke H1 which is significantly larger than a stroke H2 of the first plate spring arrangement 54 .
  • the spiral compression spring 52 is preferably provided with a smaller spring constant than the first disk spring arrangement 54.
  • the stroke H1 can be designed in particular to compensate for the necessary thread travel or screwing travel when screwing on an additional drill rod element.
  • the stroke H2 of the first disc spring arrangement 54 is preferably used to dampen the axial shocks that can be exerted by the drilling tool.
  • the coaxial second spring device 60 has exclusively a second disc spring arrangement 64, which is supported on one side on a shoulder of the outer spindle unit 60 and on the other side on a second flange 28, which is detachably attached, in particular screwed, to the outside of the tubular base body 22 of the inner spindle unit 20 .
  • a second receiving pocket 66 is formed by means of a cover ring 42 on the outer spindle unit 40, in which the plate springs of the second plate spring arrangement 60 are arranged in a protected manner.
  • a prestressing force F TFZ can be transmitted from the outer spindle unit 40 to the inner spindle unit 20 via the second disc spring arrangement 60, which can also serve to dampen axial forces of a down-the-hole-hammer drilling unit.
  • the cover ring 42 keeps disc springs 60 in preload when the inner spindle unit 20 is displaced axially to the right.
  • annular guide slot 34 can be arranged on the outside of the tubular base body 22, in which a corresponding guide projection 44 of the outer spindle unit 40 engages.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)

Description

Die Erfindung betrifft eine Bohrantriebsvorrichtung für ein Erdbohrgerät mit einer Spindelanordnung, welche eine innere Spindeleinheit und eine äußere Spindeleinheit aufweist, welche axial verschiebbar auf der inneren Spindeleinheit und schwimmend zwischen zwei Federeinrichtungen gelagert ist, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a drilling drive device for an earth drilling device with a spindle arrangement which has an inner spindle unit and an outer spindle unit which is mounted in an axially displaceable manner on the inner spindle unit and is floating between two spring devices, according to the preamble of claim 1.

Derartige Bohrantriebsvorrichtungen sind insbesondere bei Bohrgeräten zum Erd- und Gesteinsbohren bekannt, bei welchen als ein Bohrwerkzeug eine Imlochhammerbohreinheit eingesetzt wird. Bei einer Imlochhammerbohreinheit sind ein oder mehrere axial angetriebene Schlagelemente vorgesehen, welche beim rotierenden Antrieb der Imlochhammerbohreinheit zusätzlich eine schlagende Bewegung ausführen. Derartige Imlochhammerbohreinheiten können insbesondere zum Erstellen eines Bohrloches in einem Felsgestein eingesetzt werden. Eine Imlochhammereinheit geht etwa aus der EP 3 336 301 A1 hervor.Such drilling drive devices are known in particular in drilling devices for earth and rock drilling, in which a down-the-hole-hammer drilling unit is used as a drilling tool. In a down-the-hole-hammer drilling unit, one or more axially driven percussion elements are provided, which additionally execute a percussive movement when the down-the-hole-hammer drilling unit is driven in rotation. Such down-the-hole hammer drilling units can be used in particular to create a borehole in rock. A down the hole hammer unit goes about from the EP 3 336 301 A1 out.

Es ist bekannt, dass die bei einer Imlochhammerbohreinheit ausgeübte zusätzliche Schlagbewegung zu einer zusätzlichen Belastung des Rotationsbohrantriebes führt. Zur Reduzierung dieser Belastung ist es weiter bekannt, eine Antriebsspindel des Bohrantriebes in axialer Richtung federnd zu lagern, so dass die axialen Hammerschläge sich nicht unmittelbar auf die Lager des Bohrantriebes auswirken können.It is known that the additional impact movement exerted in a down-the-hole-hammer drilling unit leads to an additional load on the rotary drilling drive. To reduce this load, it is also known to resiliently mount a drive spindle of the drill drive in the axial direction, so that the axial hammer blows cannot directly affect the bearings of the drill drive.

Allerdings wird durch eine derartige Lagerung die weitere Betriebsweise der Antriebsspindel beeinflusst. Insbesondere ist es im Bohrbetrieb erforderlich, auch bei einem Einsatz einer Imlochhammerbohreinheit eine gewisse axiale Andruckkraft aufzubringen. Zudem muss auch ein gewisses axiales Spiel vorgesehen sein, um ein axiales Verschrauben bei einem Bohrgestänge aus mehreren Bohrstangen mit Gewindeverbindungen zu erlauben.However, the further operation of the drive spindle is influenced by such a bearing. In drilling operations, in particular, it is necessary to apply a certain axial pressure force even when using a down-the-hole hammer drilling unit. In addition, a certain amount of axial play must also be provided in order to allow axial screwing in a drill string composed of several drill rods with threaded connections.

CN 85 100 828 A offenbart eine Bohrantriebsvorrichtung mit einer zwischen zwei Tellerfedern schwimmend angeordneten Spindeleinheit. CN 85 100 828 A discloses a drilling drive device with a spindle unit arranged in a floating manner between two disk springs.

Der Erfindung liegt die Aufgabe zugrunde, eine Bohrantriebsvorrichtung anzugeben, welche einerseits einen effizienten Bohrbetrieb und andererseits eine gute Schonung des Bohrantriebs beim Einsatz eines axial schlagenden Bohrwerkzeuges ermöglicht.The invention is based on the object of specifying a drilling drive device which, on the one hand, enables efficient drilling operation and, on the other hand, a good protection of the drilling drive when using an axially percussive drilling tool.

Die Aufgabe wird nach der Erfindung durch eine Bohrantriebsvorrichtung mit den Merkmalen des Anspruchs 1 gelöst. Bevorzugte Ausführungsformen der Erfindung sind in den abhängigen Ansprüchen angegeben.According to the invention, the object is achieved by a drilling drive device having the features of claim 1 . Preferred embodiments of the invention are given in the dependent claims.

Die erfindungsgemäße Bohrantriebsvorrichtung ist dadurch gekennzeichnet, dass eine erste vordere Federeinrichtung, welche an einer Bohrwerkzeugseite angeordnet ist, eine Kombination zumindest einer Spiraldruckfeder und einer ersten Tellerfederanordnung umfasst, und dass eine zweite hintere Federeinrichtung, welche von der Bohrwerkzeugseite abgewandt ist, eine zweite Tellerfederanordnung aufweist.The drilling drive device according to the invention is characterized in that a first front spring device, which is arranged on one side of the drilling tool, comprises a combination of at least one spiral compression spring and a first plate spring arrangement, and that a second rear spring device, which faces away from the drilling tool side, has a second plate spring arrangement.

Eine Grundidee der Erfindung besteht darin, zwischen der äußeren Spindeleinheit und der inneren Spindeleinheit eine schwimmende Lagerung zwischen zwei Federvorspannvorrichtungen vorzusehen. Insbesondere weist dabei eine erste vordere Federeinrichtung, welche der Seite mit dem Bohrwerkzeug zugewandt ist, und eine zweite hintere Federeinrichtung, welche von der Bohrwerkzeugseite abgewandt ist, jeweils eine Tellerfederanordnung auf. Durch diese beiden Tellerfederanordnungen können Schlagbewegungen, welche von dem Bohrwerkzeug, insbesondere einer Imlochhammereinheit, ausgehen, besonders gut aufgefangen und abgedämpft werden. Je nach Art der Anordnung kann dabei ein Bohrwerkzeug mit der inneren Spindeleinheit oder der äußeren Spindeleinheit verbunden sein. Vorzugsweise wird das Drehmoment über die äußere Spindeleinheit eingeleitet, so dass durch die fehlende Lagerung Stöße von der inneren Spindeleinheit nicht oder nur stark abgedämpft auf die äußere Spindeleinheit übertragen werden können. Im umgekehrter Weise kann auch eine Drehmomentübertragung von einem Bohrantrieb zunächst auf die innere Spindeleinheit erfolgen, während das Bohrwerkzeug direkt oder über ein Bohrgestänge mit der äußeren Spindeleinheit verbunden ist.A basic idea of the invention is to provide a floating bearing between two spring prestressing devices between the outer spindle unit and the inner spindle unit. In particular, a first front spring device, which faces the side with the drilling tool, and a second rear spring device, which faces away from the drilling tool side, each have a disk spring arrangement. With these two plate spring arrangements, impact movements which emanate from the drilling tool, in particular a down-the-hole hammer unit, can be absorbed and dampened particularly well. Depending on the type of arrangement, a drilling tool can be connected to the inner spindle unit or the outer spindle unit. The torque is preferably introduced via the outer spindle unit, so that, due to the lack of storage, shocks from the inner spindle unit cannot be transmitted to the outer spindle unit, or can only be transmitted in a greatly dampened manner. Conversely, torque can also be transmitted from a drilling drive first to the inner spindle unit, while the drilling tool is connected to the outer spindle unit directly or via a drill rod.

Gemäß einem weiteren Aspekt der Erfindung ist an der ersten vorderen Federeinrichtung zusätzlich zu der ersten Tellerfederanordnung mindestens eine Spiraldruckfeder angeordnet. Die vorzugsweise relativ weiche Spiraldruckfeder ermöglicht dabei insbesondere ein leichtes Relativverschieben zwischen den beiden Spindeleinheiten, was etwa beim Anschrauben von Bohrgestängeelementen mit Gewindeverbindungen vorteilhaft ist. Insgesamt kann so ein effizienter Bohrbetrieb bei einer gleichzeitigen guten Dämpfung von Schlägen vom Bohrwerkzeug auf den Bohrantrieb erreicht werden.According to a further aspect of the invention, at least one spiral compression spring is arranged on the first front spring device in addition to the first disk spring arrangement. The preferably relatively soft spiral compression spring allows it in particular, a slight relative displacement between the two spindle units, which is advantageous, for example, when screwing on drill rod elements with threaded connections. Overall, efficient drilling operation can be achieved with simultaneous good damping of impacts from the drilling tool on the drilling drive.

Eine bevorzugte Ausführungsform der Erfindung besteht darin, dass die Spiraldruckfeder der ersten Federeinrichtung einerseits an einem radial nach außen gerichteten ersten Flansch an der Außenseite der inneren Spindeleinheit und andererseits an einem Auflagering abgestützt ist, welcher axial verschiebbar durch die Tellerfederanordnung federnd an der äußeren Spindeleinheit gelagert ist. Durch die Lagerung der Spiraldruckfeder an der Außenseite der Spindelanordnung wird eine gute Beweglichkeit bei einfacher Wartung der Teile sichergestellt.A preferred embodiment of the invention consists in the spiral compression spring of the first spring device being supported on the one hand on a radially outwardly directed first flange on the outside of the inner spindle unit and on the other hand on a support ring which is resiliently mounted on the outer spindle unit in an axially displaceable manner by the disk spring arrangement . By mounting the spiral compression spring on the outside of the spindle arrangement, good mobility with easy maintenance of the parts is ensured.

Der Flansch kann an der Außenseite einstückig mit der inneren Spindeleinheit ausgebildet oder daran befestigt sein.The flange may be integral with or attached to the inner spindle unit on the outside.

Eine weitere zweckmäßige Ausgestaltung der Bohrantriebsvorrichtung nach der Erfindung ergibt sich dadurch, dass die zweite Tellerfederanordnung der zweiten hinteren Federeinrichtung einerseits an einem radial nach außen gerichteten zweiten Flansch der inneren Spindeleinheit und andererseits an der äußeren Spindeleinheit abgestützt ist. Zumindest einer der radial nach außen gerichteten Flansche ist dabei lösbar angebracht. Insgesamt wird so eine gute Montierbarkeit der Federanordnung ermöglicht.A further expedient embodiment of the drilling drive device according to the invention results from the fact that the second disc spring arrangement of the second rear spring device is supported on the one hand on a radially outwardly directed second flange of the inner spindle unit and on the other hand on the outer spindle unit. At least one of the radially outwardly directed flanges is detachably attached. Overall, this enables the spring arrangement to be easily assembled.

Gemäß einer Weiterbildung der Erfindung ist es vorgesehen, dass eine Drehmomentübertragungseinrichtung, insbesondere eine axiale Keilwellenverzahnung, angeordnet ist. Die Drehmomentübertragungseinrichtung ist ausgebildet, ein Drehmoment von einem Antriebsrad eines Bohrantriebes auf die Spindelanordnung zu übertragen. Die Drehmomentübertragungseinrichtung kann dabei an der inneren Spindeleinheit oder der äußeren Spindeleinheit ausgebildet sein. Vorzugsweise ist die Drehmomentübertragungseinrichtung zwischen der vorderen Federeinrichtung und der hinteren Federeinrichtung angeordnet. Hierdurch wird einer übermäßigen Belastung eines Bohrantriebes durch axiale Schläge im Bohrbetrieb entgegengewirkt.According to a development of the invention, it is provided that a torque transmission device, in particular an axial splined shaft toothing, is arranged. The torque transmission device is designed to transmit a torque from a drive wheel of a drilling drive to the spindle arrangement. The torque transmission device can be formed on the inner spindle unit or the outer spindle unit. The torque transmission device is preferably arranged between the front spring device and the rear spring device. This counteracts excessive loading of a drilling drive by axial impacts during drilling.

Grundsätzlich können die Tellerfederanordnungen beliebig ausgebildet sein. Eine besonders wartungsarme Ausbildungsform ergibt sich nach einer Weiterbildung der Erfindung dadurch, dass die erste Tellerfederanordnung und/oder die zweite Tellerfederanordnung in einer Aufnahmetasche aufgenommen sind. Die Aufnahmetasche kann dabei insbesondere an einem der Flansche ausgebildet sein. Die Aufnahmetasche ist insbesondere eine ringförmige Aufnahmenut.In principle, the disk spring arrangements can be of any design. According to a further development of the invention, a particularly low-maintenance embodiment results from the fact that the first disk spring arrangement and/or the second disk spring arrangement are accommodated in a receiving pocket. The receiving pocket can be formed in particular on one of the flanges. The receiving pocket is in particular an annular receiving groove.

Nach einer weiteren Ausführungsvariante der erfindungsgemäßen Bohrvorrichtung ist es vorteilhaft, dass an einer Vorderseite der inneren Spindeleinheit eine Verbindungseinrichtung zum Anbringen eines Bohrgestängeelementes vorgesehen ist. Bei der Verbindungseinrichtung kann dabei insbesondere ein Gewinde vorgesehen sein, an welchem ein passender Gewindebereich eines Bohrgestängeelementes angeschraubt wird.According to a further embodiment variant of the drilling device according to the invention, it is advantageous that a connecting device for attaching a drill rod element is provided on a front side of the inner spindle unit. In the connection device, in particular, a thread can be provided, to which a suitable threaded area of a drill rod element is screwed.

Für einen effizienten Bohrbetrieb ist es insbesondere vorteilhaft, dass die Spiraldruckfeder eine kleinere Federkonstante und einen größeren Federweg aufweist als die der ersten Tellerfederanordnung. Die Spiraldruckfeder kann so insbesondere ein notwendiges axiales Spiel sicherstellen, welches zum Anbringen von Bohrgestängeelementen gewünscht ist.For efficient drilling operation, it is particularly advantageous that the spiral compression spring has a smaller spring constant and a greater spring deflection than that of the first disc spring arrangement. In particular, the spiral compression spring can thus ensure a necessary axial play, which is desired for attaching drill rod elements.

Besonders vorteilhaft ist es dabei, dass der Federweg der Spiraldruckfeder gleich oder größer als eine Gewindelänge eines anzubringenden Bohrgestängeelementes mit einem Verbindungsgewinde ist.It is particularly advantageous that the spring deflection of the spiral compression spring is equal to or greater than a thread length of a drill rod element to be attached with a connecting thread.

Zum Sicherstellen einer definierten axialen Bewegung zwischen den beiden Spindeleinheiten ist es nach einer Weiterbildung der Erfindung zweckmäßig, dass an der inneren Spindeleinheit ein ringförmiger Führungsschlitz gebildet ist, in welchem ein hülsenförmiger Führungsvorsprung der äußeren Spindeleinheit passend eingreift. Hierdurch wird eine geführte Bewegung zwischen den beiden Spindeleinheiten sichergestellt.To ensure a defined axial movement between the two spindle units, it is expedient according to a further development of the invention for an annular guide slot to be formed on the inner spindle unit, in which a sleeve-shaped guide projection of the outer spindle unit fits. This ensures a guided movement between the two spindle units.

Die Erfindung umfasst weiterhin ein Bohrgerät, insbesondere ein Erdbohrgerät mit mindestens einem Bohrantrieb, wobei durch den Bohrantrieb eine äußere Spindeleinheit einer erfindungsgemäßen Bohrantriebsvorrichtung angetrieben ist. Das Bohrgerät kann dabei insbesondere ein Pfahlbohrgerät sein, welches zum Herstellen von Gründungspfählen im Boden zum Einsatz kommt. Dabei kann eine beliebiges Bohrwerkzeug eingesetzt werden, etwa eine Bohrschnecke, ein Endlosbohrer, ein Bohreimer oder Ähnliches.The invention also includes a drilling device, in particular an earth drilling device, with at least one drilling drive, with an outer spindle unit of a drilling drive device according to the invention being driven by the drilling drive. The drilling device can in particular be a pile drilling device, which is used to produce foundation piles in the ground. Any one can Drilling tools are used, such as an auger, an endless drill, a drilling bucket or the like.

Nach einer Weiterbildung ist es bevorzugt, dass als ein Bohrwerkzeug eine Imlochhammereinheit an einem Bohrgestänge angebracht ist, welches rotierend mittels der Bohrantriebsvorrichtung antreibbar ist. Eine derartige Imlochhammereinheit ist grundsätzlich aus dem Stand der Technik bekannt. Diese weist einen in der Regel zylindrischen Grundkörper auf, an dessen zum Boden gerichteter Unterseite ein oder mehrere Hammerelemente axial reversierend angetrieben sind. Ein axiales Antreiben der Hammerelemente kann dabei insbesondere über Zuführung eines Druckfluides, insbesondere von Druckluft, erfolgen. Zur Zuführung des Druckfluides sowie einer Bohrflüssigkeit und/oder zum Abführen der Bohrflüssigkeit mit Bohrklein kann die Spindelanordnung und insbesondere die innere Spindeleinheit rohrförmig mit einem inneren Hohlraum ausgebildet sein, durch welche entsprechende Leitungen geführt sein können.According to a further development, it is preferable for a down-the-hole hammer unit to be attached to a drill rod as a drilling tool, which can be driven in rotation by means of the drill drive device. Such a down-the-hole-hammer unit is basically known from the prior art. This has a generally cylindrical base body, on the underside of which is directed towards the ground, one or more hammer elements are driven in an axially reversing manner. The hammer elements can be driven axially in particular by supplying a pressure fluid, in particular compressed air. To supply the pressurized fluid and a drilling fluid and/or to drain the drilling fluid with cuttings, the spindle arrangement and in particular the inner spindle unit can be tubular with an inner cavity through which corresponding lines can be routed.

Die Erfindung wird nachfolgend anhand eines bevorzugten Ausführungsbeispieles weiter beschrieben, welches schematisch in den Zeichnungen dargestellt ist. In den Zeichnungen zeigen:

Fig. 1
eine schematische Querschnittsansicht durch eine erfindungsgemäße Bohrantriebsvorrichtung;
Fig. 2
eine vergrößerte Darstellung des linksseitigen Bereichs der Bohrantriebsvorrichtung gemäß Fig. 1; und
Fig. 3
eine vergrößerte Querschnittsansicht des rechtsseitigen Bereichs der Bohrantriebsvorrichtung gemäß Fig. 1.
The invention is described in more detail below using a preferred exemplary embodiment, which is illustrated schematically in the drawings. In the drawings show:
1
a schematic cross-sectional view through a drilling drive device according to the invention;
2
according to FIG 1 ; and
3
FIG. 12 is an enlarged cross-sectional view of the right side portion of the drill drive assembly of FIG 1 .

Eine erfindungsgemäße Bohrantriebsvorrichtung 10, welche in den Figuren 1 bis 3 dargestellt ist, ist im Wesentlichen aus einer inneren Spindeleinheit 20 mit einem rohrförmigen Grundkörper 22 mit einem inneren Kanal 23 sowie einer rohrförmigen äußeren Spindeleinheit 40 aufgebaut, welche koaxial zur inneren Spindeleinheit 20 ist und diese umgibt. Über eine etwa mittige Drehmomentübertragungseinrichtung 70 wird in grundsätzlich bekannter Weise über einen oder mehrere Bohrantriebe 5, welche vorzugsweise hydraulisch angetrieben sind, ein Drehmoment auf die äußere Spindeleinheit 40 und/oder die innere Spindeleinheit 20 übertragen. Die innere Spindeleinheit 20 erstreckt sich durch die ringförmige Drehmomentübertragungseinrichtung 70 nach hinten hindurch und weist an ihrem hinteren, von einem Bohrwerkzeug abgewandten Ende, eine Drehdurchführung 12 zur Übertragung wenigstens eines Fluides von einem nicht-dargestellten Bohrgerät in den inneren Kanal 23 der rohrförmigen inneren Spindeleinheit 20 auf.A drilling drive device 10 according to the invention, which in the Figures 1 to 3 is shown is essentially composed of an inner spindle unit 20 with a tubular base body 22 with an inner channel 23 and a tubular outer spindle unit 40 which is coaxial to the inner spindle unit 20 and surrounds it. About a central torque transmission device 70 in a basically known manner via one or more drill drives 5, which are preferably hydraulically driven, a torque on the outer Spindle unit 40 and / or the inner spindle unit 20 transferred. The inner spindle unit 20 extends through the ring-shaped torque transmission device 70 to the rear and, at its rear end facing away from a drilling tool, has a rotary feedthrough 12 for transmitting at least one fluid from a drilling device (not shown) into the inner channel 23 of the tubular inner spindle unit 20 on.

Die Drehdurchführung 12 weist dabei im Wesentlichen zwei Hauptkomponenten auf, nämlich einen Rotor 14, welcher mit der inneren Spindeleinheit 20 drehfest verbunden ist und einen davon nach hinten abgewandten Stator 16, welcher über eine Drehmomentstütze 18 an einem Gehäuse der Drehmomentübertragungseinrichtung 70 abgestützt ist. Der Rotor 14 dreht sich relativ zu dem feststehenden Stator 16, an welchem eine Fluidleitung, etwa zur Übertragung einer Spül- oder Bohrsuspension, angeschlossen werden kann. Die äußere Spindeleinheit 40 dreht mit der inneren Spindeleinheit 20, welche relativ axial verschiebbar zur äußeren Spindeleinheit 40 gelagert ist.The rotary feedthrough 12 essentially has two main components, namely a rotor 14, which is non-rotatably connected to the inner spindle unit 20 and a stator 16 facing away from it to the rear, which is supported on a housing of the torque transmission device 70 via a torque arm 18. The rotor 14 rotates relative to the stationary stator 16, to which a fluid line, such as for transferring a mud or drilling suspension, can be connected. The outer spindle unit 40 rotates with the inner spindle unit 20, which is mounted so that it can be displaced axially relative to the outer spindle unit 40.

An einer zu einem Bohrloch gerichteten Vorderseite der inneren Spindeleinheit 20 ist ein radial nach außen gerichteter erster Flansch 24 angeordnet, an welchem mittels einer Verbindungseinrichtung 25 ein Bohrwerkzeug direkt oder indirekt über angebrachte Bohrgestängeelemente lösbar befestigt werden kann. Das Bohrwerkzeug kann insbesondere eine Imlochhammerbohreinheit sein, welche ein oder mehrere axial angetriebene Schlagelemente aufweist.A radially outwardly directed first flange 24 is arranged on a front side of the inner spindle unit 20 directed toward a borehole, to which a drilling tool can be detachably fastened directly or indirectly via attached drill rod elements by means of a connecting device 25 . The drilling tool can in particular be a down-the-hole hammer drilling unit which has one or more axially driven percussion elements.

Zur Dämpfung von Schlagimpulsen von einer Imlochhammerbohreinheit auf die Drehmomentübertragungseinrichtung 70 ist die Bohrantriebsvorrichtung 10 mit einer ersten Federeinrichtung 50 und einer zweiten Federeinrichtung 60 versehen, welche nachfolgend näher mit Bezug auf die Figuren 2 und 3 näher beschrieben werden.In order to damp impact pulses from a down-the-hole-hammer drilling unit on the torque transmission device 70, the drilling drive device 10 is provided with a first spring device 50 and a second spring device 60, which are described in more detail below with reference to FIG figures 2 and 3 be described in more detail.

Die erste Federeinrichtung 50 weist dabei zwei Federkomponenten auf, nämlich eine Spiraldruckfeder 52 und eine erste Tellerfederanordnung 54. Die zur Bohrachse koaxiale Spiraldruckfeder 52 ist dabei nach vorne an dem ersten Flansch 24 am rohrförmigen Grundkörper 22 der inneren Spindeleinheit 20 und andererseits an einem Auflagering 30 abgestützt.The first spring device 50 has two spring components, namely a spiral compression spring 52 and a first disc spring arrangement 54. The spiral compression spring 52, which is coaxial to the drilling axis, is supported at the front on the first flange 24 on the tubular base body 22 of the inner spindle unit 20 and on the other hand on a support ring 30 .

Der Auflagering 30 kann einen ersten Ring 31 und einen zweiten Ring 32 aufweisen. Der erste Ring 31 ist dabei verschiebbar an der Außenseite der inneren Spindeleinheit 20 gelagert und gegenüber der äußeren Spindeleinheit 40 mittels der koaxialen ersten Tellerfederanordnung 54 federnd abgestützt, wobei durch die erste Tellerfederanordnung 54 auf den ersten Ring 31 und damit den Auflagering 30 eine erste Vorspannkraft FTF ausgeübt wird. Über einen radial vorstehenden Anschlag steht der erste Ring 31 mit dem zweiten Ring 32 in Verbindung, auf welchen sich auf einem treppenartigen Absatz das andere Ende der Spiraldruckfeder 52 abstützt, wobei über die Spiraldruckfeder 52 eine Vorspannkraft FDF auf den ersten Flansch 24 und damit die erste innere Spindeleinheit 20 ausgeübt wird.The support ring 30 can have a first ring 31 and a second ring 32 . The first ring 31 is slidably mounted on the outside of the inner spindle unit 20 and is resiliently supported relative to the outer spindle unit 40 by means of the coaxial first disk spring arrangement 54, with the first disk spring arrangement 54 exerting a first prestressing force F TF is exercised. The first ring 31 is connected to the second ring 32 via a radially protruding stop, on which the other end of the spiral compression spring 52 is supported on a step-like shoulder, with a pretensioning force F DF acting on the first flange 24 and thus the first inner spindle unit 20 is exercised.

Die Spiraldruckfeder 52 ermöglicht dabei einen Hub H1, welcher deutlich größer als ein Hub H2 der ersten Tellerfederanordnung 54 ist. Vorzugsweise ist dabei die Spiraldruckfeder 52 mit einer kleineren Federkonstante versehen als die erste Tellerfederanordnung 54. Der Hub H1 kann insbesondere dazu ausgelegt sein, beim Anschrauben eines zusätzlichen Bohrgestängeelementes den notwendigen Gewindeweg oder Verschraubungsweg zu kompensieren. Der Hub H2 der ersten Tellerfederanordnung 54 dient vorzugsweise zur Dämpfung der axialen Schläge, die von dem Bohrwerkzeug ausgeübt werden können.The spiral compression spring 52 enables a stroke H1 which is significantly larger than a stroke H2 of the first plate spring arrangement 54 . The spiral compression spring 52 is preferably provided with a smaller spring constant than the first disk spring arrangement 54. The stroke H1 can be designed in particular to compensate for the necessary thread travel or screwing travel when screwing on an additional drill rod element. The stroke H2 of the first disc spring arrangement 54 is preferably used to dampen the axial shocks that can be exerted by the drilling tool.

Gemäß Fig. 3 weist die koaxiale zweite Federeinrichtung 60 ausschließlich eine zweite Tellerfederanordnung 64 auf, welche sich einerseits an einer Schulter der äußeren Spindeleinheit 60 und andererseits an einem zweiten Flansch 28 abstützt, welcher lösbar an der Außenseite des rohrförmigen Grundkörpers 22 der inneren Spindeleinheit 20 befestigt, insbesondere aufgeschraubt ist. Mittels eines Abdeckringes 42 an der äußeren Spindeleinheit 40 ist eine zweite Aufnahmetasche 66 gebildet, in welcher die Tellerfedern der zweiten Tellerfederanordnung 60 geschützt angeordnet sind. Über die zweite Tellerfederanordnung 60 kann eine Vorspannkraft FTFZ von der äußeren Spindeleinheit 40 auf die innere Spindeleinheit 20 übertragen werden, welche ebenfalls zum Dämpfen von Axialkräften einer Imlochhammerbohreinheit dienen kann. Der Abdeckring 42 hält Tellerfedern 60 in Vorspannung, wenn die innere Spindeleinheit 20 axial nach rechts verschoben ist.According to 3 the coaxial second spring device 60 has exclusively a second disc spring arrangement 64, which is supported on one side on a shoulder of the outer spindle unit 60 and on the other side on a second flange 28, which is detachably attached, in particular screwed, to the outside of the tubular base body 22 of the inner spindle unit 20 . A second receiving pocket 66 is formed by means of a cover ring 42 on the outer spindle unit 40, in which the plate springs of the second plate spring arrangement 60 are arranged in a protected manner. A prestressing force F TFZ can be transmitted from the outer spindle unit 40 to the inner spindle unit 20 via the second disc spring arrangement 60, which can also serve to dampen axial forces of a down-the-hole-hammer drilling unit. The cover ring 42 keeps disc springs 60 in preload when the inner spindle unit 20 is displaced axially to the right.

Zur Sicherstellung einer Führung kann an der Außenseite des rohrförmigen Grundkörpers 22 ein ringförmiger Führungsschlitz 34 angeordnet sein, in welchen ein entsprechender Führungsvorsprung 44 der äußeren Spindeleinheit 40 eingreift.To ensure guidance, an annular guide slot 34 can be arranged on the outside of the tubular base body 22, in which a corresponding guide projection 44 of the outer spindle unit 40 engages.

Claims (11)

  1. Drill drive device for an earth drilling apparatus with a spindle arrangement which has an inner spindle unit (20) and an outer spindle unit (40) that is supported in an axially displaceable manner on the inner spindle unit (20) and floating between two spring means (50, 60),
    characterized in that
    - a first front spring means (50) which is arranged on a drilling tool side comprises a combination of at least a compression coil spring (52) and a first disk spring arrangement (54) and
    - in that a second rear spring means (60) which faces away from the drilling tool side has a second disk spring arrangement (64).
  2. Drill drive device according to claim 1,
    characterized in that
    the compression coil spring (52) of the first spring means (50) is retained on the one hand on a radially outward-directed first flange (24) on the external side of the inner spindle unit (20) and on the other hand on a bearing ring (30) which is supported on the outer spindle unit (40) by being axially displaceable and spring-loaded by the first disk spring arrangement (54).
  3. Drill drive device according to claim 1 or 2,
    characterized in that
    the second disk spring arrangement (64) of the second rear spring means (60) is retained on the one hand on a radially outward-directed second flange (28) of the inner spindle unit (20) and on the other hand on the outer spindle unit (40).
  4. Drill drive device according to any one of claims 1 to 3,
    characterized in that
    a torque transmission means (70), in particular an axial splined shaft toothing, is arranged.
  5. Drill drive device according to any one of claims 1 to 4,
    characterized in that
    the first disk spring arrangement (54) and/or the second disk spring arrangement (64) are received in a receiving recess (56, 66).
  6. Drill drive device according to any one of claims 1 to 5,
    characterized in that
    on a front side of the inner spindle unit (20) a connecting means (25) for mounting a drill rod element is provided.
  7. Drill drive device according to any one of claims 1 to 6,
    characterized in that
    the compression coil spring (52) has a smaller spring constant and a larger spring deflection than those of the first disk spring arrangement (54).
  8. Drill drive device according to claim 7,
    characterized in that
    the spring deflection of the compression coil spring (52) is equal to or larger than a thread length of a drill rod element with a connecting thread to be mounted.
  9. Drill drive device according to any one of claims 1 to 8,
    characterized in that
    on the inner spindle unit (20) a ring-shaped guide slot (34) is formed, into which a sleeve-shaped guide protrusion (44) of the outer spindle unit (40) engages so as to fit.
  10. Drilling apparatus, in particular earth drilling apparatus, with at least one drill drive (5),
    characterized in that
    by the drill drive (5) an outer spindle unit (40) of a drill drive device (10) according to any one of claims 1 to 9 is driven.
  11. Drilling apparatus according to claim 10,
    characterized in that
    as drilling tool a down-the-hole hammer unit is mounted on a drill rod which can be driven in a rotating manner by means of the drill drive device (10).
EP20212287.5A 2020-12-07 2020-12-07 Drilling drive device for an earth boring machine Active EP4008877B1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
PL20212287.5T PL4008877T3 (en) 2020-12-07 2020-12-07 Drilling drive device for an earth boring machine
HRP20231003TT HRP20231003T1 (en) 2020-12-07 2020-12-07 Drilling drive device for an earth boring machine
ES20212287T ES2954753T3 (en) 2020-12-07 2020-12-07 Drilling drive device for a ground drilling rig
EP20212287.5A EP4008877B1 (en) 2020-12-07 2020-12-07 Drilling drive device for an earth boring machine
HUE20212287A HUE062539T2 (en) 2020-12-07 2020-12-07 Drilling drive device for an earth boring machine
RS20230709A RS64474B1 (en) 2020-12-07 2020-12-07 Drilling drive device for an earth boring machine
KR1020210170882A KR20220080712A (en) 2020-12-07 2021-12-02 Drill drive device for an earth drilling apparatus
JP2021196034A JP7235843B2 (en) 2020-12-07 2021-12-02 Drill drive for underground drilling equipment
CN202111458312.3A CN114592792A (en) 2020-12-07 2021-12-02 Drilling driving device for earth drilling equipment
CA3141025A CA3141025A1 (en) 2020-12-07 2021-12-03 Drill drive device for an earth drilling apparatus
US17/544,519 US11719045B2 (en) 2020-12-07 2021-12-07 Drill drive device for an earth drilling apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20212287.5A EP4008877B1 (en) 2020-12-07 2020-12-07 Drilling drive device for an earth boring machine

Publications (3)

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EP4008877A1 EP4008877A1 (en) 2022-06-08
EP4008877B1 true EP4008877B1 (en) 2023-06-07
EP4008877C0 EP4008877C0 (en) 2023-06-07

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US (1) US11719045B2 (en)
EP (1) EP4008877B1 (en)
JP (1) JP7235843B2 (en)
KR (1) KR20220080712A (en)
CN (1) CN114592792A (en)
CA (1) CA3141025A1 (en)
ES (1) ES2954753T3 (en)
HR (1) HRP20231003T1 (en)
HU (1) HUE062539T2 (en)
PL (1) PL4008877T3 (en)
RS (1) RS64474B1 (en)

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FI66460C (en) * 1982-10-08 1984-10-10 Tampella Oy Ab TRYCKMEDIEDRIVEN SLAGAPPARAT
CN85100828B (en) * 1985-04-01 1987-10-07 华中工学院 Geologic drilling rig mounted or automobile
JPH1037645A (en) * 1996-07-30 1998-02-10 Koken Boring Mach Co Ltd Drill head for rotary percussion drill
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US7137458B2 (en) * 2004-11-12 2006-11-21 The Hong Kong Polytechnic University Impact mechanism for a hammer drill
JP4469738B2 (en) 2005-02-14 2010-05-26 株式会社エムズ Drilling device
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FI123185B (en) * 2011-04-15 2012-12-14 Sandvik Mining & Constr Oy Rotation unit, rock drilling unit and method for rock drilling
NO344886B1 (en) * 2012-02-28 2020-06-15 Smart Stabilizer Systems Ltd TORQUE CONTROL DEVICE FOR A DOWNHOLE DRILLING ASSEMBLY.
EP2772606B1 (en) * 2013-02-27 2015-04-08 Eurodrill GmbH Drive device and method for operating a drive device
CN105401878B (en) * 2015-12-03 2019-04-09 山河智能装备股份有限公司 A kind of Large Diameter DTH Hammer hammer
EP3336301B1 (en) 2016-12-19 2023-09-13 BAUER Maschinen GmbH Drilling apparatus and method for producing a borehole

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CN114592792A (en) 2022-06-07
CA3141025A1 (en) 2022-06-07
PL4008877T3 (en) 2023-09-11
HRP20231003T1 (en) 2023-12-08
US11719045B2 (en) 2023-08-08
EP4008877A1 (en) 2022-06-08
RS64474B1 (en) 2023-09-29
JP7235843B2 (en) 2023-03-08
HUE062539T2 (en) 2023-11-28
EP4008877C0 (en) 2023-06-07
ES2954753T3 (en) 2023-11-24
JP2022090631A (en) 2022-06-17
US20220178204A1 (en) 2022-06-09
KR20220080712A (en) 2022-06-14

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