DRILL ROD COUPLING AND METHOD FOR ACTUATING THE DRILL ROD COUPLING

Abstract

The invention relates to a drill rod coupling having a sleeve-shaped coupling receptacle, a pin-shaped coupling member which can be inserted axially into the coupling receptacle to form a torque proof connection, and at least one locking bolt which is directed transversely to the axial coupling direction and extends, in a locked coupling position, between the coupling receptacle and the coupling member into a locking recess, wherein the locking bolt is mounted so as to be radially adjustable between an unlocking position and a locking position. Efficient coupling is achieved in that a tensioning device is provided by means of which the locking bolt is pressed into its locking position with a predefined tensioning force, and in that the locking bolt is connected to a resetting member by means of which the locking bolt can be reset into the unlocking position when a resetting force is applied.

Claims

1-15. (canceled)

16. Drill rod element or drilling tool having a drill rod coupling, wherein the drill rod coupling is provided with - a sleeve shaped coupling receptacle, which is arranged on a first drill rod element or drilling tool, - a pin shaped coupling member which can be inserted axially into the coupling receptacle to form a torque proof connection for conjoint rotation, and which is arranged on a second drill rod element or drilling tool, and - at least one locking bolt which is directed transversely to the axial coupling direction and extends, in a locked coupling position, between the coupling receptacle and the coupling member into a locking recess, - wherein the locking bolt is mounted so as to be radially adjustable between an unlocking position and a locking position, characterized in - that the drill rod coupling can be used for coupling between the individual drill rod elements, or between a drill rod element and the drilling tool, - that a tensioning device is provided by means of which the locking bolt is pressed into its locking position with a predefined tensioning force, and - that the locking bolt is connected to a resetting member by means of which the locking bolt can be reset into the unlocking position when a resetting force is applied.

17. Drill rod element or drilling tool having a drill rod coupling according to claim 16, characterized in that the locking bolt is mounted in a housing, and in that the resetting member protrudes from the housing and is mechanically actuable.

18. Drill rod element or drilling tool having a drill rod coupling according to claim 17, characterized in that the locking bolt is mounted in the housing so as to be rotatable about its bolt axis, in that the resetting member extends transversely to the bolt axis and is formed as a lever for rotating the locking bolt, and in that a slotted link mechanism is provided between the locking bolt and the housing, by means of which a rotary movement of the locking bolt can be converted into a movement radially to the drill rod axis.

19. Drill rod element or drilling tool having a drill rod coupling according to claim 18, characterized in that the slotted link mechanism has an at least partially helical groove as a slotted link, in which a cam engages.

20. Drill rod element or drilling tool having a drill rod coupling according to claim 16, characterized in that the resetting member is provided with a tapered slide mechanism by means of which an axial movement can be converted into a radial movement of the locking bolt.

21. Drill rod element or drilling tool having a drill rod coupling according to claim 16, characterized in that a contact element is arranged at a free end of the resetting member which member is provided with a rounded contact surface.

22. Drill rod element or drilling tool having a drill rod coupling according to claim 16, characterized in that an actuating drive, in particular a linear drive, is provided for applying the resetting force.

23. Drill rod element or drilling tool having a drill rod coupling according to claim 16, characterized in that the at least one locking bolt with the tensioning device is mounted in the pin shaped coupling member.

24. Drill rod element or drilling tool having a drill rod coupling according to claim 23, characterized in that two locking bolts are mounted opposite one another in the coupling member, and in that the tensioning device is arranged axially directed in the coupling member.

25. Drill rod element or drilling tool having a drill rod coupling according to claim 24, characterized in that the tensioning device has a spring loaded pusher with a pushing surface inclined with respect to the drill rod axis, and in that the locking bolts have, at their radially inner ends, inclined actuating surfaces which rest against the pushing surface of the pusher.

26. Drill rod element or drilling tool having a drill rod coupling according to claim 16, characterized in that the resetting member is a movable axial piston of the actuating drive.

27. Drill rod element or drilling tool having a drill rod coupling according to claim 16, characterized in that the locking bolt has a chamfer on its free front side, so that the locking bolt can be pressed radially into its unlocking position during an axial coupling of the coupling receptacle and coupling member.

28. Drill rod element or drilling tool having a drill rod coupling according to claim 27, characterized in that the locking bolt has a main body with, mounted displaceably thereon, a pawl on the free front side of which the chamfer is formed, and in that a spring element is arranged between the main body and the pawl, so that the pawl of the locking bolt can be pressed radially into the unlocking position during an axial coupling of the coupling receptacle and the coupling member.

29. Drill rod element or drilling tool having a drill rod coupling according to claim 16, characterized in that at least one unlocking spring is provided, by means of which the at least one locking bolt can be reset from its locking position into the unlocking position.

30. Drilling device, comprising a drill drive for driving in rotation a drill rod having a drilling tool and a rotary table, wherein a drill rod element or drilling tool having a drill rod coupling according to claim 16 is provided, characterized in that the resetting member of the drill rod coupling can be actuated by the rotary table.

31. Method for actuating a drill rod element or drilling tool having a drill rod coupling according to claim 16, characterized in that the locking boltis pressed into its locking position by the tensioning device with a predefined tensioning force, and in that when a resetting force is applied to the resetting member, the locking bolt is reset into the unlocking position in which the pin shaped coupling member can be axially displaced relative to the sleeve shaped coupling receptacle.

Description

[0027] The invention is further described with reference to preferred exemplary embodiments, which are shown schematically in the drawings. The drawings show:

[0028] FIG. 1 a perspective illustration of a sleeve-shaped coupling receptacle of a first drill rod coupling according to the invention;

[0029] FIG. 2 a cross-sectional view of the coupling receptacle from FIG. 1 with a coupling member to be inserted;

[0030] FIG. 3 a cross-sectional view of the drill rod coupling during insertion of the coupling member;

[0031] FIG. 4 a cross-sectional view of the drill rod coupling from FIGS. 1 to 3 with the coupling member locked;

[0032] FIG. 5 a partial cross-sectional view through a drilling device with the locked drill rod coupling according to FIG. 4;

[0033] FIG. 6 a cross-sectional view of the drilling device according to FIG. 5 when releasing the drill rod coupling;

[0034] FIG. 7 the drilling device of FIGS. 5 and 6 with the coupling member unlocked;

[0035] FIG. 8 a cross-sectional view of the drill rod coupling according to FIGS. 5 to 7 when the unlocked coupling member is pulled out of the coupling receptacle;

[0036] FIG. 9 a perspective view of a further drill rod coupling according to the invention;

[0037] FIG. 10 a cross-sectional view of the drill rod coupling from FIG. 9 with locking bolt in locking position;

[0038] FIG. 11 a cross-sectional view corresponding to FIG. 10 of the drill rod coupling with locking bolt in unlocked position;

[0039] FIG. 12 a partial side view of a drilling device with the drill rod coupling according to FIGS. 9 to 11 before unlocking;

[0040] FIG. 13 a partial side view of a drilling device according to FIG. 12 during unlocking;

[0041] FIG. 14 a perspective view of a coupling member of a further drill rod coupling according to the invention;

[0042] FIG. 15 a cross-sectional view of the coupling member from FIG. 14;

[0043] FIG. 16 a cross-sectional view of the drill rod element of FIGS. 14 and 15 with the locking bolt retracted,

[0044] FIGS. 17-19 cross-sectional views of a further drill rod coupling according to the invention during locking;

[0045] FIGS. 20-22 cross-sectional views of the drill rod coupling of FIGS. 17 to 19 during unlocking; and

[0046] FIGS. 23-26 cross-sectional views of the drill rod coupling according to FIGS. 17 to 22 during tensioning of an unlocking spring.

[0047] FIG. 1 shows a sleeve-shaped coupling receptacle 20 of a first drill rod coupling 10 according to the invention. The sleeve-shaped coupling receptacle 20 is formed cuboidel, corresponding to a so-called Kelly box, with an upper insertion opening 22 and side openings 26 for the passage of a locking bolt. An annular connection region 24 is provided on the underside of the coupling receptacle 20 and is fixedly connected to a drilling tool (not shown).

[0048] Mounted on two opposite side walls of the coupling receptacle 20 are cylindrical housings 60, in which locking bolts 70 are radially displaceably mounted, as is clearly shown in FIG. 2. At their outer end, which extends in a radial direction to a longitudinal axis of the drill rod, a lever-like resetting member 80 is attached to each locking bolt 70. A circular disc-shaped contact element 82 with a rounded contact surface 84 is arranged at the outer end of the resetting member 80.

[0049] As will be explained in greater detail below, the resetting member 80 can be pivoted by approximately 90° from the vertically oriented position shown to a horizontal position, wherein the locking bolt 70 is rotated in the housing 60 accordingly. In the housing 60 there is provided a partially helical groove 66, into which there projects a cam 72 which is in the form of a peg and is fixedly connected to the locking bar 70. This forms, on the whole, a slotted link mechanism 64 which converts a rotary movement of the resetting member 80 into a radial linear movement of the locking bolt 70. In this way, the locking bolt 70 can be retracted from its locking position shown in FIG. 2, in which a front end of the locking bolt 70 projects into the angular receiving space of the sleeve-shaped coupling receptacle 20, into a radially retracted unlocking position, in which the locking bolt 70 no longer projects into the inner receiving space of the sleeve-shaped coupling receptacle 20.

[0050] As shown in more detail in FIG. 2, a tensioning device 40 is arranged inside the housing 60 and in the present exemplary embodiment is formed by an arrangement of disc springs 41. Here, the tensioning device 40 is supported on the one hand by a housing cover 62 of the housing 60 and on the other hand by an annular shoulder 76 of the locking bolt 70. A main body 78 of the locking bolt 70 is hereby pressed into a locking position. A pawl 71 is slidably mounted on the radially inner end of the main body 78 of the locking bolt 70 and is pressed radially inward into the locking position by a spring element 45, which is shown in FIG. 2. On its front side, the pawl 71 has an actuating surface 73 that is chamfered toward the insertion opening 22.

[0051] Via the insertion opening 22, an angular coupling member 50, which is attached to the lower end of a drill rod element 3 (not shown further), for example a so-called Kelly bar, can be inserted into the inner receiving space of the sleeve-shaped coupling receptacle 20 with a transversely directed locking recess 74 for locking the drill rod coupling 10.

[0052] As can be clearly seen in FIG. 3, a chamfer at the front end of the coupling member 50 comes here into contact with the chamfered actuating surface 73 on the pawls 71 of the opposite locking bolts 70. By further axial insertion of the coupling member 50, the pawls 71 can thus be pressed radially outward into their unlocked position against the force of the spring elements 45 by this insertion movement of the coupling member 50 alone, until the transversely directed locking recess 74 comes to rest at the level of the opposite pawls 71.

[0053] As clearly shown in FIG. 4, in this state the pawls 71 can be pressed back into their locking position by the force of their respective spring elements 45, wherein the pawls 71 project into the locking recess 74. In this state according to FIG. 4, the pin-shaped coupling member 50 is form-lockingly locked in the sleeve-shaped coupling receptacle 20. In this state of the drill rod coupling 10, both a torque and axial forces can thus be transmitted between the pin-shaped coupling member 50 and the sleeve-shaped coupling receptacle 20 via the drill rod coupling 10. The pin-shaped coupler pocket 50 is preferably attached here to a lower end of a drill rod element.

[0054] A release or unlocking of the described drill rod coupling 10 is explained in more detail below with reference to FIGS. 5 to 8.

[0055] The drill rod coupling 10 can be unlocked at a drilling device 2, which is only partially shown, by a so-called rotary table 4. The rotary table 4 represents a sleeve-shaped drive part, which is known in principle, which can be provided on the drilling device 2 for the rotary driving of so-called support pipes for cased drilling. According to the invention, one or more actuating plates 6 are arranged axially adjustably within such a rotary table 4. Axial adjustment can be effected by means of a linear drive, which is not shown here.

[0056] Starting from an upper retracted position as shown in FIG. 5, the two actuating plates 6 shown can be moved downward relative to the resetting members 80 on the drill rod coupling 10, as indicated in FIG. 6.

[0057] In the process, the actuating plates 6 come into contact with the contact elements 82 at the free end of the lever-like resetting members 80, wherein, due to the rounded contact surface 84, the resetting members 80 are pivoted from their vertical position to an approximately horizontal position through approximately 90°, as can be clearly seen in FIG. 7. Due to the above-described slotted link mechanism 64 according to FIG. 1, each locking bolt 70 together with its pawl 71 can be radially retracted from the locking position in the locking recess 74 of the pin-shaped coupling member 50 into an unlocking position by this rotating or pivoting movement of the resetting members 80. In the process, the locking pawls 71 of the locking bolts 70 leave the transversely directed locking recess 74 so that the pin-shaped coupling member 50 can be pulled axially out of the sleeve-shaped coupling receptacle 20, as is clearly shown in FIG. 8.

[0058] With the axial upward movement of the drill rod element 3 with the coupling member 50, the actuating plates 6 also move upward. Now, the locking bolts 70 are pressed inward again into their locking position via the tensioning device 40, wherein the resetting members 80 rotate back into the vertical starting position via the slotted link mechanism 64.

[0059] An alternative drill rod coupling 10 is shown in FIGS. 9 to 13. The pin-shaped coupling member 50, which is not shown in more detail, corresponds to the above-described coupling member 50.

[0060] The coupling receptacle 20 is also formed substantially in accordance with the coupling receptacle 20 described above. In deviation from the above-described exemplary embodiment according to FIGS. 1 to 8, the housing 60 with the locking bolt 70 as well as the resetting member 80 have a different design.

[0061] The resetting member 80 is formed as an exclusively axially movable lever with a slotted link fork 86. The resetting member 80 is mounted so that it can be moved axially between an upper position, which is shown in FIGS. 9 and 10, and a lower position as shown in FIG. 11. In the upper position, the resetting member 80 is not in direct operative connection with the locking bolt 70 in the housing 60, so that the locking bolt 70 is pressed into its inwardly projecting locking position by a tensioning device 40 formed by springs, as can be seen clearly in FIG. 10.

[0062] By pressing the resetting members 80 downward into their respective lower position as shown in FIG. 11, the locking bolt 70 is radially retracted into the unlocking position by the slotted link fork 86 with a stepped actuating surface in accordance with a slotted link mechanism (not shown in more detail), which is clearly shown in FIG. 11. After the axial pressure on the resetting members 80 has been cancelled, they are pushed back into their upper position by a return spring 88. The tensioning device 40 moves the locking bolt 70 back into the locking position. In principle, other slotted link mechanisms can also be provided which convert an axial actuating movement on the resetting members 80 into a radial retraction movement of the locking bolts 70.

[0063] FIGS. 12 and 13 show a drilling device 2 with which the drill rod coupling 10 can be actuated according to FIGS. 9 to 11. A drilling bucket, which is only partially shown, is detachably attached as a drilling tool 8 to a drill rod element 3 by means of the drill rod coupling 10. The drill rod element 3 projects through a rotary drive 9, also called a power rotary head. An opening plate 5 is arranged on the rotary drive 9 and is axially spaced from the resetting members 80 in FIG. 12.

[0064] By moving actuating bolts 7 on the opening plate 5 downward and by moving the rotary device 3 and thus the opening plate 5 and drilling tool 8 axially toward each other, as shown in FIG. 13, the resetting members 80 are pressed downward. This unlocks the drill rod coupling 10 and the drilling tool 8 can be removed from the drill rod element 3.

[0065] A further drill rod coupling 10 according to the invention will be explained in conjunction with FIGS. 14 to 16.

[0066] In this embodiment, the locking bolts 70 are housed in the pin-shaped coupling member 50. In the illustrated exemplary embodiment according to FIG. 14, the pin-shaped coupling member 50 has an adapter sleeve 56 corresponding to a Kelly box, so that the pin-shaped coupling member 50 can be attached to a conventional drill rod element with a square connection. A circular disc-shaped stop plate 58 can be arranged between the adapter sleeve 56 and the actual pin-shaped coupling member 50 and by which can be achieved a defined axial position during insertion into a sleeve-shaped coupling receptacle. The sleeve-shaped coupling receptacle can be formed here according to a conventional Kelly box. Of course, the pin-shaped coupling member 50 can also be attached directly to a drill rod element 3, for example a so-called Kelly bar.

[0067] As can be seen from FIG. 15, 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 at the bottom at a base plate 52 of the coupling member 50 and at the top at a shoulder of a conical pusher 42. The compressive force of the tensioning device 40 pushes the conical pusher 42 upward into an upper position. Two opposing locking bolts 70 with obliquely oriented pushing surfaces 43 abut the conical surface of the pusher 42. The locking bolts 70 can be slidably coupled to the conical pusher 42 via tongue-and-groove connections, not shown in more detail.

[0068] In the upper position of the pusher 42 according to FIG. 15, the locking bolts 70 are thus pressed radially outward into their locking position by the tensioning device 40. For unlocking and thus radially retracting the locking bolts 70, an overhead linear drive is arranged as an actuating drive 46 with an extendable axial piston 48. The actuating drive 46 can in particular be a hydraulic cylinder.

[0069] For unlocking, the axial piston 48 can be extended downward by the actuating drive 46, wherein the pusher 42 is pressed downward by the axial piston 48 against the force of the tensioning device 40. In the process, the locking bolts 70 held on the pusher 42 are retracted radially into their unlocking position, in which they are located within the pin-shaped coupling member 50, as is clearly shown in FIG. 16. When the actuating drive 46 is retracted, the axial piston 48 is pushed upward again by the pusher 42 and the tensioning device 40. At the same time, the locking bolts 70 here are moved radially outward again into their locking position, so that fail-safe operation is ensured even if the linear drive 46 fails in the locking position, i.e. in the operating position.

[0070] A further embodiment of a drill rod coupling 10 according to the invention with a sleeve-shaped coupling receptacle 20 and a pin-shaped coupling member 50 is shown in FIGS. 17 to 26. Similarly to the preceding exemplary embodiment according to FIGS. 14 to 19, two transversely directed locking bolts 70 are displaceably mounted in a coupling member 50. The coupling member 50 has a central longitudinal channel 51, in which a push rod 90 is arranged as a resetting member 80, which is hingedly connected to the two locking bolts 70 via articulated levers 92. A tensioning device 40 in the form of a helical spring is arranged inside the longitudinal channel 51 and is supported at its upper side on a supporting disc 54 in the longitudinal channel 51. The supporting disc 54 is fundamentally displaceably mounted in the longitudinal channel 51, wherein the supporting disc 54 has a side recess 55 on its outer side. A transversely directed locking pin 59 engages in this side recess 55 and is movably mounted on the coupling member 50. In the locking position shown in FIG. 17, the locking pin 59 engages in the side recess 55, wherein the supporting disc 54 is fixed in its position.

[0071] Furthermore, the tensioning device 40 is supported downward on a first radial shoulder 94, which is formed fixedly on the push rod 90.

[0072] Due to the inclined surfaces on the locking bolts 70 and the insertion opening 22 of the coupling receptacle 20, the locking bolts 70 are moved radially inward into the coupling member 50 when the coupling member 50 is inserted axially, as is clearly shown in FIG. 18. In the process, the articulated levers 92 move the push rod 90 with the first radial shoulder 94 upward. This compresses and tensions the coil spring of the tensioning device 40.

[0073] As soon as the locking bolts 70 are in line with the locking recesses 74 on the coupling receptacle 20 when the coupling member 50 is inserted, the locking bolts 70 are pressed radially outward into the locking recesses 74 by the tensioning device 40. In the process, the tensioning device 40 pushes the push rod 90 downward with the first radial shoulder 94, wherein the articulated levers 92 press the locking bolts 70 radially outward, as shown in FIG. 19.

[0074] For unlocking, the locking pin 59 is pulled radially outward, as shown clearly in FIG. 20. This removes the positional fixation of the supporting disc 54 in the longitudinal channel 51. In this state, an unlocking spring 100, which is supported on the one hand on an annular shoulder 53 on the longitudinal channel 51 and on the other hand on a driver disc 96 on the push rod 90 and is in a tensioned state according to FIGS. 17 to 20, can now trigger a downward movement of the push rod 90. Here, the unlocking spring 100 presses the driver disc 96 downward on the push rod 90, as shown clearly in FIG. 21. Together with the push rod 90 moves the tensioning device 40 attached thereto with the supporting disc 54 downward. By means of the articulated levers 92, pushing the push rod 90 downward causes the locking bolts 70 to be retracted radially from the locking recesses 74 of the sleeve-shaped coupling receptacle 20. In this way, the spring force of the unlocking spring 100 can achieve an unlocked state, which is shown in FIG. 22. In this unlocked state, the coupling member 50 can now be withdrawn axially from the coupling receptacle 20, as shown in FIG. 23.

[0075] Before a new locking process, the unlocking spring 100 must be returned from its relaxed position as shown in FIGS. 22 and 23 into its tensioned actuation state. For this purpose, the actuating rod 70, which projects axially out of the coupling member 50 in the relaxed state of the unlocking spring 100, is pushed back again into the coupling member 50. This can be done, for example, by placing the coupling member 50 with the protruding push rod 90 on the outer edge of the coupling receptacle 20 and thereby pushing the push rod 90 back into the coupling member 50, as clearly illustrated in FIGS. 24 and 25.

[0076] The upward movement of the push rod 90 also pushes the driver disc 96 upward, wherein the unlocking spring 100 is pressed against the annular shoulder 53 and thus is tensioned again. At the same time, the tensioning device 40 with the supporting disc 54 attached to it is pushed upward again into its initial position. In this initial position, the supporting disc 54 can again be fixed in its position by pushing the locking pin 59 radially inward. By moving the push rod 90 upward, the locking bolts 70 are also reset into their radially outwardly projecting initial position by the articulated levers 92, as is clearly shown in FIG. 26. In this state according to FIG. 26, a new locking process can now take place according to FIG. 17.