(19)
(11)EP 3 362 644 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
11.12.2019 Bulletin 2019/50

(21)Application number: 15781342.9

(22)Date of filing:  14.10.2015
(51)International Patent Classification (IPC): 
E21D 20/00(2006.01)
E21B 17/07(2006.01)
E21B 17/03(2006.01)
(86)International application number:
PCT/EP2015/073813
(87)International publication number:
WO 2017/063692 (20.04.2017 Gazette  2017/16)

(54)

EXTENDABLE APPARATUS, DRILL HEAD, AND METHOD

AUSZIEHBARE VORRICHTUNG, BOHRKOPF UND VERFAHREN

APPAREIL EXTENSIBLE, TÊTE DE PERÇAGE ET PROCÉDÉ


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(43)Date of publication of application:
22.08.2018 Bulletin 2018/34

(73)Proprietor: Sandvik Intellectual Property AB
811 81 Sandviken (SE)

(72)Inventors:
  • HABERER, Christoph
    8753 Hetzendorf (AT)
  • BISCHOF, Andreas
    8742 Obdach (AT)

(74)Representative: Sandvik 
Sandvik Mining and Construction Oy PL 100 Patent Department
33311 Tampere
33311 Tampere (FI)


(56)References cited: : 
WO-A1-2005/047649
US-A1- 2007 086 862
US-A- 3 603 207
US-A1- 2014 112 724
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    Field of invention



    [0001] The invention relates to an extendable apparatus, in particular an extendable apparatus for a drill head. The invention further relates to a drill head comprising an extendable apparatus, and a method of operating a drill head.

    Background art



    [0002] Devices and methods for installing ground anchoring systems, including drilling rock or tensioning rock bolts or other connectors, for example, are known from US 2007/0086862 A1, JPH 03125788 A, WO 2005/047649 A1, US 2007/0114070 A1, or US 2009/0304455 A1. However, further improvements of the devices and methods are sought. For example, operational safety, in particular related to operating temperatures, and less complexity, for example with respect to the provision of supply media, such as hydraulic oil, are important fields for improvements.

    Summary of the Invention



    [0003] Therefore, it is an object of the present invention to provide an extendable apparatus, a drill head and a method of operating a drill head, which are improved over existing solutions with respect to at least one of the above mentioned goals.

    [0004] This object is solved by an extendable apparatus, in particular for a drill head, comprising a base section and a drive section; an extension section and a functional section; the base section and the drive section being moveable with respect to the extension section and the functional section along a longitudinal axis; the drive section and the functional section being rotationally rigid coupled to each other; the base section and the extension section being rotationally rigid coupled to each other; the drive section and the functional section being rotationally moveable coupled to the extension section.

    [0005] The extendable apparatus can be used for a drill head or together with a drill head, for example. Preferably, the extendable apparatus can also be referred to as an extendable cylinder, in particular, when referring to its inner, at least partly cylindrical sections interacting to realize the translational movement along a longitudinal axis. Herein, the term extendable cylinder also comprises extendable apparatuses as described herein, which may not have a cylindrical or rotationally symmetric outer surface or outer appearance, but rather comprise further units or elements, like a drive section as described further below.

    [0006] The extendable apparatus comprises a base section and a drive section, which together are movable with respect to an extension section and a functional section along the longitudinal axis of the extendable apparatus. For ease of reference, the base section and the drive section can also be referred to together as a first translational unit and the extension section and the functional section can also be referred to as a second translational unit. In these terms, the first and the second translational unit can perform a translational movement relative to each other along a longitudinal axis of the extendable apparatus. In particular, the extension of the extendable apparatus as well as its retraction can be realized by the translational movement of the first translational unit comprising the base section and the drive section relative to the second translational unit comprising the extension section and the functional section.

    [0007] Further, the drive section and the functional section are rotationally rigid coupled to each other. Also, the base section and the extension section are rotationally coupled to each other. This means that across the first and second translational units, rotational units between the drive section and the functional section on the one hand and the base section and the extension section on the other hand are formed. Thus, while the base section and the drive section are movable with respect to the extension section and the functional section along a longitudinal axis, a rotationally rigid coupling is realized between the base section and the extension section and between the drive section and the functional section.

    [0008] Further still, the drive section and the functional section are coupled to the extension section in a rotationally movable way.

    [0009] The extendable apparatus has the advantage that in general a lower operating temperature will be generated during operation of the extendable apparatus, in particular during drilling operation or rotational operation of the extendable apparatus, in particular, when applied in a drill head. The invention is based, inter alia, on the finding that a less complex construction and easier sealing arrangements, in particular rotational sealing arrangements, can be employed when the translational units are separated from the rotational mechanics and in particular the rotationally rigid couplings are chosen between sections such that a base section and the extension section can be decoupled in a rotational sense from the drive section and the functional section. By generating lower operating temperatures, operating safety can be increased alongside a longer lifetime, less wear on seal arrangements and other elements of the construction as well as broader ranges of applicability of the extendable apparatus, for example in areas with limited ranges of operating temperatures, all together. With a construction as described herein, operating temperatures of about 80 - 100°C can be realized. One particular advantage of the extendable apparatus described herein is that the rotational seals do not need to withstand the high pressure of hydraulic fluid needed for operating the extendable apparatus, but only need to withstand atmospheric pressure. However, lower loads and stresses on the seals lead to lower operating temperatures. A further advantage of the lower load and stress on the seals, in particular of a construction which does not need high pressure rotational seals, is a higher lifetime of the components. For example, existing solutions may rely on a rotary union with seals resulting in high temperature during rotation. According to the solution described herein, supply media, such as hydraulic oil, can be supplied through a nonrotating section and thus a rotary union is not needed. The lower operating temperature leads to a lower risk of degradation, wear or rupture of lubrication or lubricating film and thus enhances reliability and service life of the extendable apparatus.

    [0010] An embodiment of the extendable apparatus is particularly preferred, wherein the base section and the drive section are rotationally moveable relative to each other, and/or wherein the base section and the drive section are fixed relative to each other with respect to the longitudinal axis.

    [0011] Additionally, or alternatively, an embodiment is preferred wherein the extension section and the functional section are rotationally moveable relative to each other, and/or wherein the extension section and the functional section are fixed relative to each other with respect to the longitudinal axis.

    [0012] For example, in a preferred embodiment, the drive section may comprise a substantially shaft-form structure enclosing the functional section.

    [0013] In a further preferred embodiment, the functional section may comprise a protrusion or spline coupling at its proximal end, wherein preferably the protrusion or spline coupling is rotationally rigid coupled with the drive section and longitudinally movable relative to the drive section.

    [0014] It is further particularly preferred that the extension section and/or the base section are rotationally rigid coupled to a housing. In this embodiment, basically the extension section and/or the base section are fixed against rotation while the drive section and the functional section can be rotated. Further preferably, the base section and/or the drive section are translationally rigid coupled to a housing, such that the extension section and the functional section are translationally movable with respect to the base section and the drive section and the housing along the longitudinal axis. It is particularly preferred that the base section is rotationally rigid and translationally rigid coupled to the housing.

    [0015] In a further preferred embodiment, the base section and/or the extension section comprise at least one connector for provision of supply media. Supply media can be any media needed for the operation of the extendable apparatus, in particular for driving the drive section and/or the functional section of the extendable apparatus, for example, via a drive unit, and/or for extending and/or retracting the extendable apparatus. Supply media can be, for example, hydraulic fluid, such as hydraulic oil, or electric energy. By providing at least one connector for provision of supply media at the base section and/or the extension section, preferably at the base section, which is rotationally rigid and translationally rigid coupled to a housing, the provision of supply media can be separated from rotating units or rotating segments. In particular, the transfer of pressurized hydraulic oil, for example, through a rotating unit, is no longer needed when a connector for provision of supply media, such as pressurized hydraulic oil, is located at base section and/or the extension section, in particular when the base section and/or the extension section are rotationally rigid coupled to the housing.

    [0016] Further preferably, the functional section and/or the drive section are adapted for being rotationally driven by a drive unit about the longitudinal axis. Preferably, the drive section is coupled to the drive unit for being rotationally driven by the drive unit and to transmit a torque from the drive unit to the functional section. In this way, a torque can be applied from the drive unit via the drive section to the functional section and to a functional drill element, for example, connected to the functional section for a drilling operation.

    [0017] According to a further preferred embodiment, the extendable cylinder comprises a fluid channel being part of the base section, and/or a chuck being part of the functional section; wherein the fluid channel and/or the chuck form a central cavity for supplying a fluid, in particular to the extension section and/or the functional section. The central cavity or central chamber through the extendable apparatus serves to supply a fluid, such as water or air, through the extendable apparatus and in particular to the extension section and/or the functional section, in particular to the distal end of the functional section.

    [0018] A further preferred embodiment is characterized by a first sealing kit being arranged between the fluid channel and the extension section, and/or characterized by a second sealing kit being arranged between the chuck and the extension section.

    [0019] Preferably, the first and/or second sealing kits are fluid seals sealing the central cavity against the extension section against the fluid carried or supplied within the central cavity, in particular the first and/or second sealing kit may be water seals. It is particularly preferred that one of the first and second sealing kits is designed for sealing against rotational movement and the other one is designed for translational movement. It is particularly preferred that the first sealing kit is designed for translational movement or sealing and the second sealing kit is designed for rotational movement and/or sealing. This separation has the advantage of increasing reliability and lifetime of the sealing kits. Further, it is preferred that the first and second sealing kits are designed partly or fully identical and/or exchangeable. In this way, the complexity of the construction and the number of different parts can be reduced.

    [0020] In a further preferred embodiment, the functional section is coupled to the extension section via a bearing, preferably a double row angular ball bearing. Preferably, the functional section is coupled to a distal end of the extension section via a bearing, preferably a double row angular ball bearing. The bearing preferably is an anti-friction bearing, preferably a ball and/or roller bearing. Preferably, the coupling between the functional section and the extension section is sealed and/or lubricated, in particular according to the expected lifetime of the extendable apparatus since during the lifetime of the extendable apparatus service and maintenance (with additional lubrication, for example) of the bearing may not be intended.

    [0021] A further preferable embodiment of the extendable apparatus is characterized by an extension volume between the base section and the extension section, wherein the extendable apparatus is extendable by provision of hydraulic fluid to the extension volume. A further preferable embodiment is characterized by a retraction volume between the base section and the extension section, wherein the extendable apparatus is retractable by provision of hydraulic fluid to the retraction volume.

    [0022] Preferably, the base section and/or the extension section comprise a double-wall, and further preferably the extension volume can be formed therein such that the extendable apparatus can be extended by provision of hydraulic fluid thereto.

    [0023] A further preferred embodiment is characterized by at least one torsionally rigid coupling between the functional section and the drive section for transmitting lateral forces in at least one direction different from a direction parallel to the longitudinal axis

    [0024] In addition to the transmission of lateral forces, additional side forces can be applied. Preferably, for example, side forces preferably can be supported by transmission elements like slide bearings between the functional section and the drive section or a spline coupling between the functional section and the drive section. Further preferably, the functional section comprises a substantially shaft-form structure enclosing the extension section.

    [0025] According to a further aspect, the object is solved by a drill head, comprising an extendable apparatus as described above; a drive unit for rotationally driving the drive section and/or the functional section of the extendable apparatus about the longitudinal axis. As to the advantages, preferred embodiments and details of the drill head and its preferred embodiments, reference is made to the corresponding aspects and embodiments described above with respect to the extendable apparatus.

    [0026] According to a further aspect, the object is solved by a method of operating a drill head as described above, comprising connecting a functional drill element to a functional section; rotating the functional section of the extendable apparatus by rotationally driving a drive section of the extendable apparatus; extending and/or retracting the extendable apparatus along the longitudinal axis.

    [0027] As to the advantages, preferred embodiments and details of the method of operating a drill head and its preferred embodiments, reference is made to the corresponding aspects and embodiments described above, in particular with respect to the extendable apparatus and the drill head.

    [0028] Preferred embodiments of the invention shall now be described with reference to the attached drawings, in which
    Fig. 1:
    shows a longitudinal cross-sectional, lateral view of a drill head with an extendable apparatus in the retracted position;
    Fig. 2:
    shows a longitudinal cross-sectional, plan view of the drill head of Fig. 1;
    Fig. 3:
    shows a side view of the drill head from the opposite perspective as shown in Fig. 2;
    Fig. 4:
    shows a cross-sectional, plan view of a drill head cut in the area of the spur gear reduction;
    Fig. 5:
    shows a front view of the drill head;
    Fig. 6:
    shows an enlarged view of Fig. 1 in the area of the fluid channel;
    Fig. 7:
    shows a cross-sectional, view of the drill head cut in the area of the distal end; and
    Fig. 8:
    shows a first three-dimensional depiction of the drill head.


    [0029] In Figs. 1 - 8 a preferred example of a drill head 5000 with an extendable apparatus 50 with a drive unit 5100 is shown. Although in the figures the extendable apparatus 50 is shown in the retracted position, the extendable apparatus 50 can be extended along its longitudinal axis LA by a translational movement of the second translational unit 600 comprising the extension unit 650 and the functional section 660 relative to the first translational unit 500 comprising the base section 550 and the drive section 560. The drive section 560 and the functional section 660 are rotationally rigid coupled to each other, as well as the base section 550 and the extension section 650 are rotationally rigid coupled to each other. The drive section 560 and the functional section 660 are rotationally movable coupled to the extension section 650.

    [0030] Further, the base section and the drive section are rotationally movable relative to each other and fixed relative to each other with respect to the longitudinal axis LA. Similarly, the extension section 650 and the functional section 660 are rotationally movable relative to each other and fixed relative to each other with respect to the longitudinal axis LA. Both, the extension section 650 and the base section 550 are rotationally rigid coupled to a housing. The functional section 660 and the drive section 560 are adapted for being rotationally driven by the drive unit 5100 about the longitudinal axis LA. Drive unit 5100 is adapted to drive the drive section 560 via the spur gear reduction stage 5300, which transfers the torque to the drive section. The extendable apparatus 50 is supported by taper roller bearings 5400 arranged back to back. The two rings of taper roller bearings 5400 are adapted to receive the loads and forces coming from operation of the drill head 5000. Next to the taper roller bearings 5400, V-rings 702 are located. On the distal side, these are arranged as double-V-rings. These rotational seals or V-rings 702 need to have a compact desing based on the limited space available. Speed sensors 5700 are adapted to control the speed of the rotation.

    [0031] The drive section 560 has a substantially shaft-formed structure enclosing the functional section 660. The functional section 660 has a substantially shaft-formed structure enclosing the extension section 650. Further, the functional section 660 comprises a protrusion or spline coupling 662 at its proximal end, wherein the protrusion or spline coupling 622 is rotationally rigid coupled with the drive section 560 and longitudinally or translationally moveable relative to the drive section 560. Further, at least one torsionally rigid coupling 60 is located between the functional section 660 and the drive section 560 for transmitting lateral forces in at least one direction, different from a direction parallel to the longitudinal axis LA. Additional side forces can be supported by the spline coupling 622 and/or by the transmission element 530 in the form of the slide bearing between the functional section 660 and the drive section 560. The base section 550 is sealed against the extension section 650 via first and second main sealing kits 700, 701. The extension section 650 comprises a double-wall with an inner wall 610 and an outer wall 620. At the proximal end 621 of the outer wall, a sealing sleeve 623 is located.

    [0032] Connectors for the provision of hydraulic fluid in the form of hydraulic fluid supply 800 are realized at the base section 550, namely in the form of a radial hydraulic fluid supply 810 and a longitudinal hydraulic fluid supply 820, which feed first and second hydraulic fluid channels 830, 840 to supply pressurized hydraulic fluid to the extension volume 850 between the base section 550 and the extension section 650 and to the retraction volume 860 between the base section 550 and the extension section 650. The extendable apparatus 50 is extendable by provision of hydraulic fluid to the extension volume 850 and it is retractable by provision of hydraulic fluid to the retraction volume 860. Space 880 is connected to a breather in order to allow for the extendable apparatus to be extended and retracted. The complete functions of the extendable apparatus 50 are hydraulically secured against overloads or excess pressure by a pressure valve 870.

    [0033] A fluid channel 540 is part of the base section 550 and a chuck 900 is part of the functional section 660. Together, the fluid channel 540 and the chuck 900 form a central cavity 541 or central chamber for supplying a fluid, in particular water or air, to the extension section 650 and in particular to the functional section 660, particularly the distal end of the function section 660. A first sealing kit 710 is arranged between the fluid channel 540 and the extension section 650 and is adapted for translational movement or sealing. A second sealing kit 720 is arranged between the chuck 900 and the extension section 650 and is adapted for rotational movement or sealing. As can be seen in particular from figure 6, both sealing kits 710, 720 are realized identical or exchangeable with first water seals 750, second water seals 760 and first and second water sealing sleeves 730, 740. At the proximal end of the chuck 900 as well as at the distal end of the fluid channel 540, nuts 703 are located.

    [0034] The functional section 660 is coupled to the extension section 650 via a double row angular ball bearing 5200, which is positioned between an inner bearing sleeve 910, a holding sleeve 920, a first bearing housing 930 and a second bearing housing 940.

    List of Reference Signs



    [0035] 
    LA
    longitudinal axis
    d
    distal
    p
    proximal
    50
    extendable apparatus
    60
    torsionally rigid coupling
    500
    first translational unit
    530
    transmission element
    540
    fluid channel
    541
    central cavity
    550
    base section
    560
    drive section
    600
    second translational unit
    610
    inner wall of the extension section
    620
    outer wall of the extension section
    621
    Proximal end of the extension section
    622
    spline coupling
    623
    sealing sleeve
    650
    extension section
    660
    functional section
    700
    first main seal kit
    701
    second main seal kit
    702
    V-ring
    703
    nut
    710
    first sealing kit
    720
    second sealing kit
    730
    first water sealing sleeve
    740
    second water sealing sleeve
    750
    first water seal
    760
    second water seal
    800
    hydraulic fluid supply
    810
    radial hydraulic fluid supply
    820
    longitudinal hydraulic fluid supply
    830
    first hydraulic fluid channel
    840
    second hydraulic fluid channel
    850
    extension volume
    860
    retraction volume
    870
    pressure valve
    880
    space
    900
    chuck
    910
    inner bearing sleeve
    920
    holding sleeve
    930
    first bearing housing
    940
    second bearing housing
    5000
    drill head
    5100
    drive unit
    5200
    double row angular ball bearing
    5300
    spur gear reduction stage
    5400
    taper roller bearings
    5700
    speed sensors



    Claims

    1. Extendable apparatus (50), for a drill head (5000), comprising

    - a base section (550) and a drive section (560);

    - an extension section (650) and a functional section (660);

    - the base section (550) and the drive section (560) being moveable with respect to the extension section (650) and the functional section (660) along a longitudinal axis (LA);

    characterized in

    - the drive section (560) and the functional section (660) being rotationally rigidly coupled to each other;

    - the base section (550) and the extension section (650) being rotationally rigidly coupled to each other;

    - the drive section (560) and the functional section (660) being rotationally movably coupled to the extension section (650).


     
    2. Extendable apparatus (50) according to claim 1,

    - wherein the base section (550) and the drive section (560) are rotationally moveable relative to each other, or

    - wherein the base section (550) and the drive section (560) are fixed relative to each other with respect to the longitudinal axis (LA).


     
    3. Extendable apparatus (50) according to at least one of the preceding claims,

    - wherein the extension section (650) and the functional section (660) are rotationally moveable relative to each other, or

    - wherein the extension section (650) and the functional section (660) are fixed relative to each other with respect to the longitudinal axis (LA).


     
    4. Extendable apparatus (50) according to at least one of the preceding claims,

    - wherein the extension section (650) or the base section (550) are rotationally rigidly coupled to a housing.


     
    5. Extendable apparatus (50) according to at least one of the preceding claims,

    - wherein the base section (550) or the extension section (650) comprise at least one connector (800) for provision of supply media.


     
    6. Extendable apparatus (50) according to at least one of the preceding claims,

    - wherein the functional section (660) or the drive section (560) are adapted for being rotationally driven by a drive unit (5100) about the longitudinal axis (LA).


     
    7. Extendable apparatus (50) according to at least one of the preceding claims, comprising

    - a fluid channel (540) being part of the base section (550), and/or

    - a chuck (900) being part of the functional section (660);

    - wherein the fluid channel (540) and/or the chuck (900) form a central cavity (541) for supplying a fluid, in particular to the extension section (650) and/or the functional section (660).


     
    8. Extendable apparatus (50) according to at least one of the preceding claims,

    - characterized by a first sealing kit (710) being arranged between the fluid channel (540) and the extension section (650), and/or

    - characterized by a second sealing kit (720) being arranged between the chuck (900) and the extension section (650).


     
    9. Extendable apparatus (50) according to at least one of the preceding claims,

    - wherein the functional section (660) is coupled to the extension section (650) via a bearing (5200), preferably a double row angular ball bearing.


     
    10. Extendable apparatus (50) according to at least one of the preceding claims,

    - characterized by an extension volume (850) between the base section (550) and the extension section (650),

    - wherein the extendable apparatus (50) is extendable by provision of hydraulic fluid to the extension volume (850).


     
    11. Extendable apparatus (50) according to at least one of the preceding claims,

    - characterized by a retraction volume (860) between the base section (550) and the extension section (650),

    - wherein the extendable apparatus (50) is retractable by provision of hydraulic fluid to the retraction volume (860).


     
    12. Extendable apparatus (50) according to at least one of the preceding claims,

    - characterized by at least one torsionally rigid coupling (60) between the functional section (660) and the drive section (560) for transmitting lateral forces in at least one direction different from a direction parallel to the longitudinal axis (LA).


     
    13. Drill head (5000), comprising

    - an extendable apparatus (50) according to at least one of the preceding claims;

    - a drive unit (5100) for rotationally driving the drive section (560) and/or the functional section (660) of the extendable apparatus (50) about the longitudinal axis (LA).


     
    14. Method of operating a drill head (5000) according to the preceding claim, comprising

    - connecting a functional drill element to a functional section (660);

    - rotating the functional section (660) of the extendable apparatus (50) by rotationally driving a drive section (560) of the extendable apparatus (50);

    - extending and/or retracting the extendable apparatus (50) along the longitudinal axis (LA).


     


    Ansprüche

    1. Ausziehbare Einrichtung (50) für einen Bohrkopf (5000), umfassend:

    - einen Basisabschnitt (550) und einen Antriebsabschnitt (560);

    - einen Auszugsabschnitt (650) und einen Funktionsabschnitt (660);

    - wobei der Basisabschnitt (550) und der Antriebsabschnitt (560) in Bezug auf den Auszugsabschnitt (650) und den Funktionsabschnitt (660) entlang einer Längsachse (LA) bewegbar sind;

    gekennzeichnet dadurch, dass

    - der Antriebsabschnitt (560) und der Funktionsabschnitt (660) drehsteif aneinandergekoppelt sind;

    - der Basisabschnitt (550) und der Auszugsabschnitt (650) drehsteif aneinandergekoppelt sind;

    - der Antriebsabschnitt (560) und der Funktionsabschnitt (660) drehbeweglich an den Auszugsabschnitt (650) gekoppelt sind.


     
    2. Ausziehbare Einrichtung (50) nach Anspruch 1,

    - wobei der Basisabschnitt (550) und der Antriebsabschnitt (560) drehbeweglich in Bezug aufeinander sind, oder

    - wobei der Basisabschnitt (550) und der Antriebsabschnitt (560) in Bezug aufeinander bezüglich der Längsachse (LA) fixiert sind.


     
    3. Ausziehbare Einrichtung (50) nach mindestens einem der vorstehenden Ansprüche,

    - wobei der Auszugsabschnitt (650) und der Funktionsabschnitt (660) drehbeweglich in Bezug aufeinander sind, oder

    - wobei der Auszugsabschnitt (650) und der Funktionsabschnitt (660) in Bezug aufeinander bezüglich der Längsachse (LA) fixiert sind.


     
    4. Ausziehbare Einrichtung (50) nach mindestens einem der vorstehenden Ansprüche,

    - wobei der Auszugsabschnitt (650) oder der Basisabschnitt (550) drehsteif an ein Gehäuse gekoppelt sind.


     
    5. Ausziehbare Einrichtung (50) nach mindestens einem der vorstehenden Ansprüche,

    - wobei der Basisabschnitt (550) oder der Auszugsabschnitt (650) mindestens ein Verbindungsstück (800) zur Bereitstellung von Versorgungsmedien umfasst.


     
    6. Ausziehbare Einrichtung (50) nach mindestens einem der vorstehenden Ansprüche,

    - wobei der Funktionsabschnitt (660) oder der Antriebsabschnitt (560) angepasst sind, um durch eine Antriebseinheit (5100) drehend um die Längsachse (LA) angetrieben zu werden.


     
    7. Ausziehbare Einrichtung (50) nach mindestens einem der vorstehenden Ansprüche, umfassend

    - eine Fluidleitung (540), die Teil des Basisabschnitts (550) ist, und/oder

    - ein Spannfutter (900), das Teil des Funktionsabschnitts (660) ist;

    - wobei die Fluidleitung (540) und/oder das Spannfutter (900) einen mittleren Hohlraum (541) für die Zufuhr eines Fluids bilden, insbesondere zum Auszugsabschnitt (650) und/oder dem Funktionsabschnitt (660).


     
    8. Ausziehbare Einrichtung (50) nach mindestens einem der vorstehenden Ansprüche,

    - gekennzeichnet durch ein erstes Dichtungsset (710), das zwischen der Fluidleitung (540) und dem Auszugsabschnitt (650) angeordnet ist, und/oder

    - gekennzeichnet durch ein zweites Dichtungsset (720), das zwischen dem Spannfutter (900) und dem Auszugsabschnitt (650) angeordnet ist.


     
    9. Ausziehbare Einrichtung (50) nach mindestens einem der vorstehenden Ansprüche,

    - wobei der Funktionsabschnitt (660) über ein Lager (5200), vorzugsweise ein zweireihiges Schrägkugellager, an den Auszugsabschnitt (650) gekoppelt ist.


     
    10. Ausziehbare Einrichtung (50) nach mindestens einem der vorstehenden Ansprüche,

    - gekennzeichnet durch ein Auszugsvolumen (850) zwischen dem Basisabschnitt (550) und dem Auszugsabschnitt (650),

    - wobei die ausziehbare Einrichtung (50) durch Bereitstellung von hydraulischem Fluid an das Auszugsvolumen (850) ausziehbar ist.


     
    11. Ausziehbare Einrichtung (50) nach mindestens einem der vorstehenden Ansprüche,

    - gekennzeichnet durch ein Einfahrvolumen (860) zwischen dem Basisabschnitt (550) und dem Auszugsabschnitt (650),

    - wobei die ausziehbare Einrichtung (50) durch Bereitstellung von hydraulischem Fluid an das Einfahrvolumen (860) einfahrbar ist.


     
    12. Ausziehbare Einrichtung (50) nach mindestens einem der vorstehenden Ansprüche,

    - gekennzeichnet durch mindestens eine torsionssteife Kopplung (60) zwischen dem Funktionsabschnitt (660) und dem Antriebsabschnitt (560) zum Übertragen von lateralen Kräften in mindestens eine Richtung, die sich von einer Richtung parallel zur Längsachse (LA) unterscheidet.


     
    13. Bohrkopf (5000), umfassend:

    - eine ausziehbare Einrichtung (50) nach mindestens einem der vorstehenden Ansprüche,

    - eine Antriebseinheit (5100), um den Antriebsabschnitt (560) und/oder den Funktionsabschnitt (660) der ausziehbaren Einrichtung (50) drehend um die Längsachse (LA) anzutreiben.


     
    14. Verfahren zum Betreiben einer Bohrkopf (5000) nach dem vorstehenden Anspruch, umfassend

    - Verbinden eines funktionalen Bohrelements mit dem Funktionsabschnitt (660),

    - Drehen des Funktionsabschnitts (660) der ausziehbaren Einrichtung (50) durch drehendes Antreiben eines Antriebsabschnitts (560) der ausziehbaren Einrichtung (50);

    - Ausziehen und/oder Einfahren der ausziehbaren Einrichtung (50) entlang der Längsachse (LA).


     


    Revendications

    1. Appareil extensible (50), pour une tête de perçage (5000), comprenant

    - une section de base (550) et une section d'entraînement (560) ;

    - une section d'extension (650) et une section fonctionnelle (660) ;

    - la section de base (550) et la section d'entraînement (560) étant mobiles par rapport à la section d'extension (650) et à la section fonctionnelle (660) le long d'un axe longitudinal (LA) ;

    caractérisé par

    - la section d'entraînement (560) et la section fonctionnelle (660) étant couplées en rotation de façon rigide l'une à l'autre ;

    - la section de base (550) et la section d'extension (650) étant couplées en rotation de façon rigide l'une à l'autre ;

    - la section d'entraînement (560) et la section fonctionnelle (660) étant couplées en rotation de façon mobile à la section d'extension (650).


     
    2. Appareil extensible (50) selon la revendication 1,

    - dans lequel la section de base (550) et la section d'entraînement (560) sont mobiles en rotation l'une par rapport à l'autre, ou

    - dans lequel la section de base (550) et la section d'entraînement (560) sont fixes l'une par rapport à l'autre par rapport à l'axe longitudinal (LA).


     
    3. Appareil extensible (50) selon au moins une des revendications précédentes,

    - dans lequel la section d'extension (650) et la section fonctionnelle (660) sont mobiles en rotation l'une par rapport à l'autre, ou

    - dans lequel la section d'extension (650) et la section fonctionnelle (660) sont fixes l'une par rapport à l'autre par rapport à l'axe longitudinal (LA).


     
    4. Appareil extensible (50) selon au moins une des revendications précédentes,

    - dans lequel la section d'extension (650) ou la section de base (550) sont couplées en rotation de façon rigide à un boîtier.


     
    5. Appareil extensible (50) selon au moins une des revendications précédentes,

    - dans lequel la section de base (550) ou la section d'extension (650) comprennent au moins un connecteur (800) pour la fourniture de milieux d'alimentation.


     
    6. Appareil extensible (50) selon au moins une des revendications précédentes,

    - dans lequel la section fonctionnelle (660) ou la section d'entraînement (560) sont adaptées pour être entraînées en rotation par une unité d'entraînement (5100) autour de l'axe longitudinal (LA).


     
    7. Appareil extensible (50) selon au moins une des revendications précédentes, comprenant

    - un canal de fluide (540) faisant partie de la section de base (550), et/ou

    - un mandrin (900) faisant partie de la section fonctionnelle (660) ;

    - dans lequel le canal de fluide (540) et/ou le mandrin (900) forment une cavité centrale (541) pour la fourniture d'un fluide, en particulier à la section d'extension (650) et/ou à la section fonctionnelle (660).


     
    8. Appareil extensible (50) selon au moins une des revendications précédentes,

    - caractérisé par un premier kit d'étanchéité (710) agencé entre le canal de fluide (540) et la section d'extension (650), et/ou

    - caractérisé par un deuxième kit d'étanchéité (720) agencé entre le mandrin (900) et la section d'extension (650).


     
    9. Appareil extensible (50) selon au moins une des revendications précédentes,

    - dans lequel la section fonctionnelle (660) est couplée à la section d'extension (650) via un roulement (5200), de préférence un roulement à billes angulaire à double rangée.


     
    10. Appareil extensible (50) selon au moins une des revendications précédentes,

    - caractérisé par un volume d'extension (850) entre la section de base (550) et la section d'extension (650),

    - dans lequel l'appareil extensible (50) est extensible par fourniture de fluide hydraulique au volume d'extension (850).


     
    11. Appareil extensible (50) selon au moins une des revendications précédentes,

    - caractérisé par un volume de rétraction (860) entre la section de base (550) et la section d'extension (650),

    - dans lequel l'appareil extensible (50) est rétractable par fourniture de fluide hydraulique au volume de rétraction (860).


     
    12. Appareil extensible (50) selon au moins une des revendications précédentes,

    - caractérisé par au moins un couplage rigide en torsion (60) entre la section fonctionnelle (660) et la section d'entraînement (560) pour la transmission de forces latérales dans au moins une direction différente d'une direction parallèle à l'axe longitudinal (LA).


     
    13. Tête de perçage (5000), comprenant

    - un appareil extensible (50) selon au moins une des revendications précédentes ;

    - une unité d'entraînement (5100) pour l'entraînement en rotation de la section d'entraînement (560) et/ou de la section fonctionnelle (660) de l'appareil extensible (50) autour de l'axe longitudinal (LA).


     
    14. Procédé de fonctionnement d'une tête de perçage (5000) selon la revendication précédente, comprenant

    - la liaison d'un élément de perçage fonctionnel à une section fonctionnelle (660) ;

    - la rotation de la section fonctionnelle (660) de l'appareil extensible (50) par entraînement en rotation d'une section d'entraînement (560) de l'appareil extensible (50) ;

    - l'extension et/ou la rétraction de l'appareil extensible (50) de long de l'axe longitudinal (LA).


     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description