EP3910160B1 - Drill string coupling and method for operating the drill string coupling - Google Patents

Description

The invention relates to a drill pipe element or drilling tool with a drill pipe coupling with a sleeve-shaped receptacle, a pin-shaped coupling member, which can be inserted axially into the coupling receptacle to form a rotationally fixed connection, and at least one locking bolt, which is directed transversely to the axial coupling direction and is in a locked coupling position between the coupling receptacle and the coupling member extends into a locking recess, the locking bolt being mounted in a radially adjustable manner between an unlocking position and a locking position.

The invention further relates to a method for actuating this drill pipe coupling according to claim 15.

Such a drill pipe coupling is, for example, from DE 10 2011 109 001 A1 known. This drill pipe coupling is often referred to as a so-called Kelly box. In the inserted coupling position, axial locking is effected by inserting a transversely directed locking bolt into the coupling receptacle and the coupling member, so that a positive connection is achieved.

However, the known drill pipe coupling requires manual activities by operating personnel both when locking and unlocking. These are generally time-consuming. In addition, in the case of drilling tools, which can be several meters long and are generally vertically oriented, the coupling arrangements can be located several meters above the ground. To operate Climbing aids or even lifting vehicles are therefore required, which is also complex. In addition, work at greater heights above the ground and also in the immediate area of action of a drill pipe is problematic for reasons of occupational safety and should therefore be reduced to a necessary minimum.

Further coupling devices are from the DE 10 2006 022 613 A1 , considered to be the closest state of the art. In exemplary embodiments, a coupling device is shown between a drill drive unit and a drill pipe element or drilling tool, with the coupling device always being in the same position. This means that coupling and uncoupling can be mechanized relatively easily. In further exemplary embodiments, the known drill pipe coupling is shown with manually insertable and removable coupling bolts.

The drill pipe coupling of the DE 20 2005 020 729 U1 and the drilling device DE 10 023 467 C1 show locking bolts displaced by a mechanism between an unlocking position and a locking position and back. The locking bolts disclosed are designed without any preload in the locking position.

The invention is based on the object of specifying a drill pipe coupling and a method for this, with which a particularly efficient coupling of a drill pipe is made possible.

The object is achieved according to the invention by a drill pipe coupling according to claim 1 and a method according to claim 15. Preferred embodiments are specified in the dependent claims.

The drill pipe coupling according to the invention is characterized in that a clamping device is provided with which the locking bolt is pressed into its locking position with a predetermined clamping force, and in that the locking bolt is connected to a restoring member, by means of which the locking bolt can be reset into the unlocking position when a restoring force is applied .

A basic idea of the invention can be seen in providing an at least semi-automatic drill pipe coupling in which the at least one locking bolt is always reliably in the locking position. This is achieved by providing a tensioning device, preferably a tension spring, with which the locking bolt is pressed into the locking position with a predetermined tension force. Unlocking can then take place via a reset member, which is operated manually or powered to move the at least one locking bolt into its retracted unlocking position or release position.

The arrangement according to the invention achieves fail-safe operation, in which locking is ensured even in the event of a failure of electrical energy or hydraulic energy on a drilling rig. To operate the locking bolts, only one direction of force application is required, namely when the clutch is to be unlocked. Locking occurs immediately through the clamping device when the respective restoring force is no longer present.

With the drill pipe coupling according to the invention, connections between individual drill pipe elements and in particular a connection between a drill pipe element and a drilling tool can be established and released in an efficient and safe manner.

A preferred embodiment of the invention is that the locking bolt is mounted in a housing and that the reset member protrudes from the housing and can be mechanically actuated. The at least one housing for the at least one locking bolt is preferably attached to an outside of the sleeve-shaped coupling receptacle. This allows the drill pipe coupling to be easily operated from the outside. The locking recess is located on the inner coupling member.

It is particularly advantageous that the locking bolt is rotatably mounted about its bolt axis in the housing, that the restoring member extends transversely to the bolt axis and is designed as a lever for rotating the locking bolt, and that a link mechanism is provided between the locking bolt and the housing, through which a rotational movement of the locking bolt can be converted into a movement radially to the drill pipe axis. The locking bolt is cylindrical and inserted into a tubular housing and rotatably mounted therein. Connected to the locking bolt is a preferably lever-like restoring member, which projects outwards relative to the housing. An axially directed force can thus be applied to the lever-like restoring member in a simple manner, which force is converted by the restoring member into a rotary movement of the locking bolt. Using a link mechanism, this rotary movement can be converted into a radial adjusting movement to unlock the locking bolt. If the restoring force is eliminated, the locking bolt is then pressed back into its locking position by the tensioning device, with the restoring member being rotated back into its starting position in accordance with the link mechanism.

According to a further development of the invention, a particularly robust embodiment is achieved in that the link mechanism has an at least partially helical groove as a link, into which a cam engages. The groove-shaped link is preferably formed at least on the inside of the housing, in particular a pin-shaped cam, which is arranged on the locking bolt, being inserted into the screw-shaped backdrop intervenes. In principle, however, the helical groove can also be formed on the outside of the locking bolt, while a corresponding pin-shaped cam is attached to an inner wall of the housing.

According to a further development of the invention, an alternative robust design of the drill pipe coupling results from the fact that the restoring member is provided with a wedge slide mechanism, through which an axial movement can be converted into a radial movement of the locking bolt. The wedge slide mechanism can be designed in basically any way to effect a movement conversion of 90°. The wedge slide mechanism can be arranged in particular on the outside of the coupling device or within the pin-shaped coupling member. By arranging at least one actuating surface directed obliquely to the drill pipe axis, the desired directional conversion of a movement can be achieved.

A particularly low-wear embodiment of an embodiment variant of the invention is achieved in that a contact element is arranged at a free end of the reset member, which is provided with a rounded contact surface. Friction can be reduced by a rounded contact surface, which preferably comes into contact with a straight counter surface. The rounded contact surface can preferably also be a rotatable element, such as a rotatable cam.

In principle, the drill pipe coupling can be operated directly by hand by an operator. An efficient embodiment variant of the invention can be seen in that an actuator, in particular a linear drive, is provided for applying the restoring force. The linear drive can in particular be a hydraulic or pneumatic actuating cylinder or an electrically operated spindle drive. In principle, a common actuator or a separate actuator can be arranged for each locking bolt. Preferably, the actuator can be controlled by wire or wirelessly, so that it can be easily operated by a machine operator, in particular from the machine cabin.

According to a further development of the invention, a particularly compact design is achieved in that the at least one locking bolt is mounted with the tensioning device in the pin-shaped coupling member. The tenon-shaped coupling link is hollow or designed with a receiving space for the at least one locking bolt and the tensioning device. In this arrangement, the locking recess is then arranged in a corresponding manner on the sleeve-shaped coupling receptacle.

For a particularly efficient locking, it is preferred that two locking bolts are mounted opposite one another in the coupling member and that the tensioning device is arranged in the coupling member in an axially directed manner. This arrangement can in particular be combined with a wedge slide mechanism, with the clamping device and optionally a linear actuator being aligned longitudinally and preferably coaxially to the drill pipe axis. In this arrangement in particular, transverse forces can compensate for each other through two, preferably radially opposite, locking bolts, so that a particularly stable arrangement is achieved.

A further advantageous embodiment variant is that the clamping device has a spring-loaded pusher with a pressure surface inclined to the drill pipe axis and that the locking bolts have inclined actuation surfaces at their inner ends, which rest on the pressure surfaces of the pusher. This creates a wedge slide mechanism through which two or more radially directed locking bolts can be pressed outwards at the same time and held there. In a corresponding manner, a linear drive can actuate the same or an opposite pusher to retract the locking bolts into their unlocking position.

According to a further embodiment variant of the invention, it is preferred that the reset member is a movable axial piston of the actuator. The reset element can be directly part of the actuator or can be moved by the actuator.

For efficient closing of the drill pipe coupling by axially retracting the coupling member into the coupling receptacle, it is advantageous for the locking bolt to have a bevel on its free front side, so that the locking bolt can be pressed radially into its unlocking position when the coupling receptacle and coupling member are coupled axially. As soon as this coupling process occurs Once the locking recesses have reached the height of the locking bolts, they can return to their locking position and thus into the locking recesses due to their spring preload. This immediately results in a secure coupling. The bevel on the front of the locking bolt serves to convert the axial relative movement between the coupling member and the coupling receptacle into a radial restoring movement of the locking bolt.

Furthermore, it is preferred that the locking bolt has a base body with a locking pawl displaceably mounted thereon, on the free front of which the bevel is formed, and that a spring element is arranged between the base body and the locking pawl, so that the locking pawl of the locking bolt is at an axial Coupling of the coupling receptacle and coupling member can be pressed radially into the unlocking position. The spring element can be designed with a lower clamping force than the clamping device, so that easy locking during an insertion process is possible. To unlock, the locking bolt must be pulled back together with the base body and the pawl against the effect of the tensioning device.

The invention further relates to a drilling device with a drill drive for rotating a drill pipe with a drilling tool and a turntable, wherein a drill pipe coupling according to the invention is provided and the reset member of the drill pipe coupling can be actuated by the turntable. The drill pipe coupling does not have to be arranged on the drill drive. Rather, the drill pipe coupling is arranged between the individual drill pipe elements or between a drill pipe element and the drilling tool. By axially moving the drill pipe relative to the turntable, which is designed in particular for screwing in drill pipe pipes for cased drilling, a necessary axial relative movement to the restoring member can be carried out directly by the drilling device without an additional actuator. In principle, further stops and arrangements for actuating the restoring member can also be provided on the drilling device by an axial relative movement between the restoring member and an actuating member.

With regard to the method, the invention is characterized in that the locking bolt is pressed into its locking position by the clamping device with a predetermined clamping force and that when a restoring force is applied to the restoring member, the locking bolt is reset into the unlocking position, in which the pin-shaped coupling member is relative to the sleeve-shaped coupling receptacle can be moved axially. The method is carried out using the previously described drill pipe coupling according to the invention. The advantages described above can be achieved.

In particular, the method can be used to efficiently construct a drill pipe from a plurality of drill pipe elements, with a drill pipe coupling being arranged between each drill pipe element. A drilling tool can also be efficiently attached and removed at the lower end of a drill pipe.

Fig. 1

eine perspektivische Darstellung einer hülsenförmigen Kupplungsaufnahme einer ersten erfindungsgemäßen Bohrgestängekupplung;

Fig. 2

eine Querschnittsansicht der Kupplungsaufnahme von Fig. 1 mit einem einzubringenden Kupplungsglied;

Fig. 3

eine Querschnittsansicht der Bohrgestängekupplung beim Einführen des Kupplungsgliedes;

Fig. 4

eine Querschnittsansicht der Bohrgestängekupplung von den Figuren 1 bis 3 mit verriegeltem Kupplungsglied;

Fig. 5

eine Teilquerschnittsansicht durch eine Bohrvorrichtung mit der verriegelten Bohrgestängekupplung nach Fig. 4;

Fig. 6

eine Querschnittsansicht der Bohrvorrichtung nach Fig. 5 beim Lösen der Bohrgestängekupplung;

Fig. 7

die Bohrvorrichtung der Figuren 5 und 6 mit entriegeltem Kupplungsglied;

Fig. 8

eine Querschnittsansicht der Bohrgestängekupplung nach den Figuren 5 bis 7 beim Herausziehen des entriegelten Kupplungsgliedes aus der Kupplungsaufnahme;

Fig. 9

eine perspektivische Ansicht einer weiteren erfindungsgemäßen Bohrgestängekupplung;

Fig. 10

eine Querschnittsansicht der Bohrgestängekupplung von Fig. 9 mit Riegelbolzen in Verriegelungsposition;

Fig. 11

eine Querschnittsansicht entsprechend Fig. 10 der Bohrgestängekupplung mit Riegelbolzen in entriegelter Position;

Fig. 12

eine Teil-Seitenansicht einer Bohrvorrichtung mit der Bohrgestängekupplung nach Figuren 9 bis 11 vor einem Entriegeln;

Fig. 13

eine Teil-Seitenansicht einer Bohrvorrichtung nach Figuren 12 bei einem Entriegeln;

Fig. 14

eine perspektivische Ansicht eines Kupplungsgliedes einer weiteren erfindungsgemäßen Bohrgestängekupplung;

Fig. 15

eine Querschnittsansicht des Kupplungsgliedes von Fig. 14; und

Fig. 16

eine Querschnittsansicht des Bohrgestängegliedes der Figuren 14 und 15 mit rückgezogenen Riegelbolzen.

The invention is further described using preferred exemplary embodiments, which are shown schematically in the drawings. Shown in the drawings:

Fig. 1

a perspective view of a sleeve-shaped coupling receptacle of a first drill pipe coupling according to the invention;

Fig. 2

a cross-sectional view of the coupling holder from Fig. 1 with a coupling member to be inserted;

Fig. 3

a cross-sectional view of the drill pipe coupling as the coupling member is inserted;

Fig. 4

a cross-sectional view of the drill pipe coupling from the Figures 1 to 3 with locked coupling link;

Fig. 5

a partial cross-sectional view through a drilling device with the locked drill pipe coupling Fig. 4 ;

Fig. 6

a cross-sectional view of the drilling device Fig. 5 when loosening the drill pipe coupling;

Fig. 7

the drilling device Figures 5 and 6 with unlocked coupling link;

Fig. 8

a cross-sectional view of the drill pipe coupling according to the Figures 5 to 7 when pulling the unlocked coupling link out of the coupling receptacle;

Fig. 9

a perspective view of another drill pipe coupling according to the invention;

Fig. 10

a cross-sectional view of the drill pipe coupling of Fig. 9 with locking bolt in locking position;

Fig. 11

a cross-sectional view accordingly Fig. 10 the drill pipe coupling with locking bolt in unlocked position;

Fig. 12

a partial side view of a drilling device with the drill pipe coupling Figures 9 to 11 before unlocking;

Fig. 13

a partial side view of a drilling device Figures 12 when unlocking;

Fig. 14

a perspective view of a coupling member of a further drill pipe coupling according to the invention;

Fig. 15

a cross-sectional view of the coupling member from Fig. 14 ; and

Fig. 16

a cross-sectional view of the drill pipe member Figures 14 and 15 with retracted locking bolts.

In Fig. 1 a sleeve-shaped coupling receptacle 20 of a first drill pipe coupling 10 according to the invention is shown. The sleeve-shaped coupling receptacle 20 is cuboid-shaped, corresponding to a so-called Kelly box, with an upper insertion opening 22 and side openings 26 for the passage of a locking bolt. On the underside of the coupling receptacle 20, an annular connection area 24 is provided, which is firmly connected to a drilling tool, not shown.

Cylindrical housings 60 are attached to two opposite side walls of the coupling receptacle 20, in which, as shown in Fig. 2 is shown, radially displaceable locking bolts 70 are mounted. On her in the radial direction A lever-like reset member 80 is attached to each locking bolt 70 at the outer end running along the drill pipe longitudinal axis. At the outer end of the reset member 80, a circular disk-shaped contact element 82 with a rounded contact surface 84 is arranged.

As will be explained in more detail later, the reset member 80 can be moved from the vertical position shown by approximately 90° into a horizontal position, with the locking bolt 70 in the housing 60 being rotated accordingly. A partially helical groove 66 is introduced into the housing 60, into which a pin-shaped cam 72 projects, which is firmly connected to the latch 70. As a result, a link mechanism 64 is formed overall, which converts a rotary movement of the reset member 80 into a radial linear movement of the locking bolt 70. The locking bolt 70 can be moved from its in Fig. 2 illustrated locking position, in which a front end of the locking bolt 70 protrudes into the angular receiving space of the sleeve-shaped coupling receptacle 20, can be retracted into a radially retracted unlocking position, in which the locking bolt 70 no longer protrudes into the inner receiving space of the sleeve-shaped coupling receptacle 20.

As in Fig. 2 is shown in more detail, a tensioning device 40 is arranged within the housing 60, which in the present exemplary embodiment is formed by an arrangement of plate springs 41. The tensioning device 40 is supported on the one hand on a housing cover 62 of the housing 60 and on the other hand on an annular shoulder 76 of the locking bolt 70. As a result, a base body 78 of the locking bolt 70 is pressed into a locking position. On the radially inner end of the base body 78 of the locking bolt 70, a locking pawl 71 is slidably mounted, which is pressed radially inwards into the locking position by a spring element 45, which is in Fig. 2 is shown. On its front, the pawl 71 has an actuation surface 73 that is beveled towards the insertion opening 22.

Via the insertion opening 22, an angular coupling member 50 can be inserted into the inner receiving space of the sleeve-shaped coupling receptacle 20, which is at the lower end of a drill pipe element 3, not shown, e.g. B. a so-called Kelly rod is attached, with a transverse locking recess 74 to close the drill pipe coupling 10 can be inserted.

How vivid in Fig. 3 As can be seen, a chamfer at the front end of the coupling member 50 comes into contact with the beveled actuating surface 73 on the locking pawls 71 of the opposite locking bolts 70. By further axial insertion of the coupling member 50, the locking pawls 71 can be moved against the direction by this insertion movement of the coupling member 50 alone Action of the spring elements 45 are pressed radially outwards into their unlocking position until the transverse locking recess 74 comes to rest at the level of the opposing pawls 71.

How clear in Fig. 4 shown, in this state the locking pawls 71 can be pressed back into their locking position by the action of the respective spring elements 45, the locking pawls 71 protruding into the locking recess 74. In this condition according to Fig. 4 the pin-shaped coupling member 50 is locked in a form-fitting manner in the sleeve-shaped coupling receptacle 20. In this state of the drill pipe coupling 10, both torque and axial forces can be transmitted between the pin-shaped coupling member 50 and the sleeve-shaped coupling receptacle 20 via the drill pipe coupling 10. The pin-shaped coupling receptacle 50 is preferably attached to a lower end of a drill pipe element.

Loosening or unlocking the drill pipe coupling 10 described is described below using the Figures 5 to 8 explained in more detail.

The drill pipe coupling 10 can be unlocked by a drilling device 2, only partially shown, with a so-called turntable 4. The turntable 4 represents a basically known sleeve-shaped drive part, which can be provided on the drilling device 2 for rotatingly driving so-called support tubes for cased drilling. According to the invention, one or more actuation plates 6 are arranged axially adjustable within such a turntable 4. Axial adjustment can be done using a linear drive, which is not shown here.

Starting from an upper retreat position according to Fig. 5 The two actuating plates 6 shown can be moved downwards relative to the restoring members 80 on the drill pipe coupling 10, as shown in FIG Fig. 6 is indicated.

The actuation plates 6 come into contact with the contact elements 82 at the free end of the lever-like return spring 80, whereby due to the rounded contact surface 84, the return members 80 are moved from their vertical position into an approximately horizontal position by approximately 90 °, as clearly shown in Fig. 7 can be recognized. Due to the link mechanism 64 described above Fig. 1 The respective locking bolt 70 together with its locking pawl 71 can be retracted radially into an unlocking position from the locking position in the locking recess 74 of the pin-shaped coupling member 50 by this rotation or folding movement of the restoring members 80. The locking pawls 71 of the locking bolts 70 leave the transverse locking recess 74, so that the pin-shaped coupling member 50 can be pulled axially out of the sleeve-shaped coupling receptacle 20, as clearly shown in FIG Fig. 8 is shown.

With the axial upward movement of the drill pipe element 3 with the coupling member 50, the actuating plates 6 also move upwards. Now the locking bolts 70 are pressed inwards again into their locking position via the tensioning device 40, with the return members 80 rotating again into the vertical starting position via the link mechanism 64.

An alternative drill pipe coupling 10 is in the Figures 9 to 13 shown. The pin-shaped coupling member 50, not shown in more detail, corresponds to the previously described coupling member 50.

The clutch receptacle 20 is also designed essentially in accordance with the previously described clutch receptacle 20. In deviation from the previously described exemplary embodiment according to Figures 1 to 8 the housing 60 with the locking bolt 70 and the reset member 80 are designed in a different configuration.

The reset member 80 is designed as an exclusively axially adjustable lever with a link fork 86. The reset member 80 is between an upper position, which is in the Figures 9 and 10 is shown, and is mounted axially displaceably in a lower position according to FIG. In the upper position, the reset member 80 is not in direct operative connection with the locking bolt 70 in the housing 60, so that the locking bolt 70 is held in place by a tensioning device 40 formed by springs is pressed into its inwardly projecting locking position, as clearly shown Fig. 10 emerges.

By pressing the reset members 80 downwards into the respective lower position according to Figure 11 the locking bolt 70 is retracted radially into the unlocking position by the link fork 86 with a stepped actuation surface corresponding to a link mechanism (not shown in detail), which is clearly shown in Fig. 11 is shown. After the axial pressure force on the restoring members 80 has been eliminated, they are pushed back into their upper position by a restoring spring 88. The clamping device 40 causes the locking bolts 70 to be moved back into the locking position. In principle, other link mechanisms can also be provided, which convert an axial actuation movement on the restoring members 80 into a radial retraction movement of the locking bolts 70.

In the Figures 12 and 13 a drilling device 2 is shown, with which the drill pipe coupling 10 according to Figures 9 to 11 can be operated. A box drill, only partially shown, is detachably attached to a drill pipe element 3 as a drilling tool 8 by means of the drill pipe coupling 10. The drill pipe element 3 protrudes through a rotary drive 9, also called a power turret. An opening plate 5 is arranged on the rotary drive 9, which in Figure 12 is axially spaced from the restoring members 80.

By moving the actuating bolts 7 downwards on the opening plate 5 and moving the rotating device 3 and thus the opening plate 5 and drilling tool 8 axially towards each other, as shown in Figure 13 is shown, the reset members 80 are pressed down. As a result, the drill pipe coupling 10 is unlocked and the drilling tool 8 can be removed from the drill pipe element 3.

Another drill pipe coupling 10 according to the invention is discussed in connection with Figures 14 to 16 explained.

In this embodiment, the locking bolts 70 are accommodated in the pin-shaped coupling member 50. The pin-shaped coupling member 50 has in the illustrated embodiment according to Fig. 14 an adapter sleeve 56 corresponding to a Kelly box, so that the pin-shaped coupling member 50 is attached to a conventional one Drill pipe element with square connection can be attached. A circular disk-shaped stop plate 58 can be arranged between the adapter sleeve 56 and the actual pin-shaped coupling member 50, through which a defined axial position is achieved when inserted into a sleeve-shaped coupling receptacle. The sleeve-shaped coupling receptacle can be designed according to a conventional Kelly box. Of course, the pin-shaped coupling member 50 can also be directly attached to a drill pipe element 3, e.g. B. a so-called Kelly bar.

How out Fig. 15 As can be seen, the coupling member 50 has an inner cavity in which a tensioning device 40, which is formed by a spring, is arranged. The tensioning device 40 is supported downwards on a base plate 52 of the coupling member 50 and upwards on a shoulder of a conical pusher 42. The pressure force of the clamping device 40 presses the conical pusher 42 upwards into an upper position. On the conical surface of the pusher 42 there are two opposite locking bolts 70 with obliquely directed pressing surfaces 43 on the conical surface of the pusher 43. The locking bolts 70 can be slidably coupled to the conical pusher 42 via tongue and groove connections (not shown).

In the upper position of the pusher 42 according to Fig. 15 The locking bolts 70 are pressed radially outwards into their locking position by the clamping device 40. For unlocking and thus radial retraction of the locking bolts 70, an overhead linear drive is arranged as an actuator 46 with an extendable axial piston 48. The actuator 46 can in particular be a hydraulic cylinder.

To unlock, the axial piston 48 can be extended downwards by the actuator 46, with the pusher 42 being pressed downwards by the axial piston 48 against the action of the clamping device 40. The locking bolts 70 held on the pusher 42 are drawn radially into their unlocking position, in which they are located within the pin-shaped coupling member 50, as clearly shown in Fig. 16 is shown. When the actuator 46 is moved back, the axial piston 48 is pushed upwards again by the pusher 42 and the clamping device 40. At the same time, the locking bolts 70 are returned to their locking position moved radially outwards, so that fail-safe operation is ensured even if the linear drive 46 fails in the locking position, i.e. in the operating position.

Claims (15)

1. Drill rod element or drilling tool having a drill pipe coupling for coupling between the single drill rod elements or between one drill rod element and the drilling tool
   whereby the drill pipe coupling with

   - a sleeve-shaped coupling receptacle (20) which is arranged at a first drill rod element or drilling tool,

   - a pegged coupling member (50) which can be inserted axially into the coupling receptacle (20) and which is arranged at a second drill rod element or drilling tool, and is provided with

   - at least one locking bolt (70), which is directed transversely to the axial direction of the coupling and, in a locked coupling position, extends between the coupling receptacle (20) and the coupling member (50) into a locking recess (74),

   - wherein the locking bolt (70) is mounted radially adjustable between an unlocking position and a locking position,

   - wherein a clamping device (40) is provided, with which the locking bolt (70) is pressed into its locking position with a predetermined clamping force, and

   - wherein the locking bolt (70) is connected to a restoring link (80) by means of which the locking bolt (70) can be reset into the unlocked position when a restoring force is applied.
2. Drill rod element or drilling tool according to claim 1,
   characterized

   in that, the locking bolt (70) is mounted in a housing (60), and

   in that, the restoring link (80) protrudes from the housing (60) and can be actuated mechanically.
3. Drill rod element or drilling tool according to claim 2,
   characterized

   in that, the locking bolt (70) is rotatably mounted about its bolt axis in the housing (60),

   in that, the restoring link (80) extends transversely to the bolt axis and is designed as a lever for turning the locking bolt (70), and

   in that, between the locking bolt (70) and the housing (60) a connecting link mechanism (64) is provided by means of which a rotary movement of the locking bolt (70) can be converted into a movement radially to the drill rod axis.
4. Drill rod element or drilling tool according to claim 3,
   characterized
   in that, the connecting link mechanism (64) has an at least partially helical groove (66) as a connecting link, into which a cam (72) engages.
5. Drill rod element or drilling tool according to claim 1 or 2,
   characterized
   in that, the restoring link (80) is provided with a wedge slide mechanism (30) by means of which an axial movement can be converted into a radial movement of the locking bolt (70).
6. Drill rod element or drilling tool according to one of claims 1 to 4,
   characterized
   in that, at a free end of the restoring link (80) a contact element (82) is arranged, which is provided with a rounded contact surface (84).
7. Drill rod element or drilling tool according to one of claims 1 to 2 or 4 to 6,
   characterized
   in that, an actuator (46), in particular a linear drive, is provided for applying the restoring force.
8. Drill rod element or drilling tool according to one of claims 1 to 7,
   characterized
   in that, the at least one locking bolt (70) is mounted with the clamping device (40) in the pegged coupling member (50).
9. Drill rod element or drilling tool according to claim 8,
   characterized

   in that, two locking bolts (70) are mounted opposite one another in the coupling member (50), and

   in that, the tensioning device (40) is arranged in the coupling member (50) in an axially directed manner.
10. Drill rod element or drilling tool according to Claim 9,
    characterized

    in that, the tensioning device (40) has a spring-loaded pusher (42) with a pusher surface (43) inclined to the axis of the drill rod, and

    in that, the locking bolts (70) have inclined actuating surfaces (73) at their radially interior ends, which lie against the pusher surface (43) of the pusher (42).
11. Drill rod element or drilling tool according to one of claims 1 to 2 or 4 to 10, characterized
    in that, the restoring link (80) is a movable axial piston (48) of the actuator (46).
12. Drill rod element or drilling tool according to one of claims 1 to 11,
    characterized
    in that, the locking bolt (70) has a bevel on its free front side, so that the locking bolt (70) can be pressed radially into its unlocking position when the coupling receptacle (20) and coupling member (50) are coupled axially.
13. Drill rod element or drilling tool according to claim 12,
    characterized

    in that, the locking bolt (70) has a base body (78) with a locking latch (71) mounted displaceably on it, on the free front side of which the bevel is formed, and

    in that, a spring element (45) is arranged between the base body (78) and the locking latch (71). is so that the locking latch (71) of the locking bolt (70) can be pressed radially into the unlocking position when the coupling receptacle (20) and coupling member (50) are coupled axially.
14. Drilling device with a drill drive for rotary driving a drill rod with a drill tool and a turntable (4), wherein a drill rod element or a drilling tool according to one of Claims 1 to 13 is provided,
    characterized
    in that, the restoring link (80) of the drill pipe coupling (10) can be actuated by the turntable (4).
15. Method of operating drill rod element or drilling tool according to any one of claims 1 to 13,
    characterized

    in that, the locking bolt (70) is pressed by the clamping device (40) with a predetermined clamping force into its locking position, and

    in that, when a restoring force is applied to the restoring link (80), the locking bolt (70) is reset into the unlocking position in which the pegged coupling member (50) relative to the sleeve-shaped coupling receptacle (20) can be displaced axially.

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