Drill drive assembly for driving a drill string, drill device equipped therewith and method for operating a drill device

Abstract

Drill drive arrangement (40) for driving a drill string, comprising at least one drive motor unit (42a, 42b) for generating and providing motor torque at a drive output element of the drive motor unit (42a, 42b), and a gearbox (41) with a gear transmission arrangement (43) which has at least two gear inputs (47a, b; 48a, b) for introducing an input torque and is configured to translate the input torque and provide it as output torque at a gearbox output (49) for driving the drill string. The gear transmission arrangement (43) has a first gear stage from at least one first gear input (47a, 47b) to the gearbox output (49) with a first gear ratio and a second gear stage from at least one second gear input (48a, 48b) to the gearbox output (49) with a second gear ratio that differs from the first gear ratio.The at least one drive motor unit (42a,42b) with the drive output element is movable between a first mounting position (A) and a second mounting position (B) such that the drive output element of the drive motor unit (42a,42b) is connected in the first mounting position (A) to the at least one first gearbox input (47a,47b) and in the second mounting position (B) to the at least one second gearbox input (48a,48b).

Description

[0001] The invention relates to a drilling drive arrangement for driving a drill string, a drilling rig equipped therewith and a method for operating a drilling rig.

[0002] Often, different drilling tasks are to be performed with a drilling drive arrangement or a drilling rig equipped with it, or a change in the rotational speed and / or torque of the drill string or the associated drill bit is desired during a complex drilling task.

[0003] One way to meet these different requirements is to use different drilling rigs. However, for complex drilling tasks, this entails considerable changeover and logistical effort, as, for example, successive drilling steps must be carried out with different drilling rigs.

[0004] In some well-known drilling rigs, the rotational speed of the drill drive is regulated or controlled via the drive motor. This allows for different rotational speeds and torques at the drill string or drill bit to be achieved with a single drilling rig. However, the disadvantages include the relatively high design complexity of the drive motor, the complex control system, and a relatively narrow speed and torque range. Such a drill drive is therefore comparatively expensive, requires relatively complex control equipment, and incurs high maintenance costs. A drilling rig with a variable-speed drill drive is described, for example, in JP 8-226372. JP 07-076984 describes the use of hydraulic motors with two speeds and an additional change in the hydraulic control of the motors from series to parallel connection.

[0005] Alternatively, drilling drives with multi-stage gearboxes have been proposed, which can be used selectively. Gearboxes are used to convert the speed and torque of an upstream motor. Speed ​​and torque can thus be actively influenced via the gearbox and its design. Depending on the size or gear stage, the motor's speed is increased or decreased. A drilling drive with a drive motor and two gear trains, which transmit the drive torque of the drive motor with different but fixed gear ratios to two concentric output shafts rotating at different speeds and which can be used selectively to drive a drilling tool, is known from JP 2002-97882 A.

[0006] Transmissions with multiple selectable gear ratios for adjusting rotational speed or torque are also known. However, due to their integrated shifting mechanism, these are comparatively complex, therefore expensive and require more maintenance, as they are less robust than transmissions with a fixed gear ratio.

[0007] From EP 2 048 321 B1, a drilling rig is known, comprising a mast, a drill drive motor unit guided on the mast for driving a drill string, and a gearbox arranged between the drill drive motor unit and the drill string for transmission. The gearbox is detachably and reversibly arranged on the drill drive motor unit to invert the transmission ratio, so that optionally, a gearbox input connected to the drill drive motor unit in a first state is used for connection to the drill string in a second, reversed state, and a gearbox output intended for connection to the drill string in the first state is connected to the drill drive motor unit in the second, reversed state.While this solution is relatively robust, the two possible translation ratios are always exactly opposite in terms of their translation into fast or slow, and it is not possible to change a translation ratio in two stages in the same translation direction.

[0008] Against this background, the invention is based on the Task The aim is to specify a drilling drive arrangement for driving a drill string, a drilling rig equipped with it, and a method for operating a drilling rig, which, with the simplest possible design and low maintenance requirements, allow for easy adjustment of the rotational speed or torque transmitted from a drive motor unit to a drill string.

[0009] To solve this problem, the invention proposes a drill drive arrangement for driving a drill string with the features of claim 1, a drill equipped therewith with the features of claim 14, and a method for operating such a drill with the features of claim 15. Preferred embodiments of the drill drive arrangement are specified in the dependent claims.

[0010] Specifically, the invention proposes a drilling drive arrangement for driving a drill string, comprising at least one drive motor unit for generating and providing a motor torque at a drive output element of the drive motor unit, a gearbox with a gear transmission arrangement which has at least two gearbox inputs for introducing an input torque and is designed to translate the input torque and provide it as output torque at a gearbox output for driving the drill string.

[0011] According to the invention, the gear transmission arrangement has a first transmission stage from at least one first transmission input to the transmission output with a first transmission ratio and a second transmission stage from at least one second transmission input to the transmission output with a second transmission ratio, which differs from the first transmission ratio.

[0012] According to the invention, the at least one drive motor unit with the drive output element is movable between a first mounting position and a second mounting position, such that the drive output element of the drive motor unit is connected to the at least one first gearbox input in the first mounting position and to the at least one second gearbox input in the second mounting position.

[0013] The invention is based on the fundamental idea that the gear arrangement of the transmission has at least two gear trains with different fixed transmission ratios and the drive motor unit is selectively moved between two mounting positions, i.e. physically reconfigured, in which it feeds its motor torque into a different gear train and the motor torque is transmitted after appropriate transmission to the common transmission output to drive the drill string.

[0014] To adjust the rotational speed or torque of the drill string and thus of the drill bit connected to it, the drive motor unit is detached from the gearbox, repositioned, and then reconnected to the gearbox in the repositioned position. The drill drive arrangement according to the invention can therefore provide two different gear ratios and thus rotational speeds of the drill string in a particularly simple manner. Whenever a gear ratio is mentioned, it is generally understood, within the meaning of the invention, to be a change in rotational speed to a faster or slower speed with a corresponding decrease or increase in torque, so that a reduction in speed is also included.

[0015] The gearbox can be of relatively simple design. In particular, it can be a non-shiftable gearbox, the basic principle of which is known from drilling rigs. However, it is modified compared to known gearboxes by having a second gearbox input that leads to another gear train with a different, fixed gear ratio, and which, like the first gear train, transmits the applied drive torque to the common gearbox output.

[0016] Adapting a construction machine to a changed machining task requiring a different torque or speed, for example, switching from a normal drilling operation to a core drilling operation, generally always necessitates changing a machining or drilling tool, which requires a certain amount of setup and downtime for the construction machine. During this phase, the drilling drive arrangement according to the invention makes it easy to reconfigure, i.e., reposition, the drive motor unit between the predefined alternative mounting positions assigned to the respective gear stage, thereby enabling the selection of a different gear stage with a different transmission ratio.The advantage over previous solutions lies in the fact that the drilling drive arrangement can be designed to be mechanically simpler, considerably more robust, and more cost-effective by eliminating a switching device for changing between the gear stages. Furthermore, a second drive motor unit can be dispensed with because the same drive motor unit can be used alternately to drive both gear stages. The need for complex drive controls for the drive motor unit to change its speed / torque characteristics is also eliminated, or, if such controls are nevertheless used in combination with the drilling drive arrangement according to the invention, results in a wider speed / torque range at the drill string.

[0017] The term "transmission ratio" or "transmission ratio" is understood in the context of this disclosure to mean the quotient i of the rotational speed of the power motor (gearbox input) and the rotational speed of the driven machine (gearbox output). For i > 1, the rotational speed is reduced, but the transmitted torque is increased (speed reduction), and for i < 1, the opposite is true (speed reduction). The invention encompasses transmission ratios in both directions, with the speed reduction being the predominant application scenario for the drill drive arrangement in deep drilling applications involving high-speed drive motors and desired high torques at the gearbox output, i.e., at the drill string.

[0018] Although the invention provides for the possibility of relocating a drive motor unit between the two mounting positions, it is also conceivable, provided the mounting positions for the two gear stages are sufficiently far apart, to mount a drive motor unit at each of the mounting positions and to deactivate one of them – depending on the desired gear ratio. The drive motor unit would then, at most, rotate passively but would not contribute to the drive torque.

[0019] In the drilling drive arrangement, the gear drive arrangement can have a further first gear input designed symmetrically to the first gear input and a further second gear input designed symmetrically to the second gear input, wherein a further drive motor unit can be provided for generating and supplying a motor torque at a drive output element of the further drive motor unit, and wherein the further drive motor unit with the drive output element is movable between a third mounting position and a fourth mounting position, such that the drive output element of the further drive motor unit is connected to the further first gear input in the third mounting position and to the further second gear input in the fourth mounting position.so that the drive torques of the drive motor unit and the further drive motor unit in the gear drive arrangement are cumulatively transmitted via the respective gear stage to the gearbox output of the gearbox.

[0020] In this extension, the two drive motor units transmit their drive torque in parallel to their respective gear stages. The change of gear stage is achieved by moving the two drive motor units from their first mounting positions (assigned to the first gear stage) to their second mounting positions (assigned to the second gear stage).

[0021] It is also conceivable to provide additional drive motor units for such parallel operation in the respective gear stages, which can be achieved by providing additional corresponding mounting positions and gear inputs.

[0022] Preferably, the mounting positions for the drive motor unit and, if present, the additional drive motor unit, each have a mounting flange that is compatible with a mating flange of the respective drive motor unit. A standardized design of the mounting flanges at the respective mounting positions facilitates the conversion of the drive motor unit(s) and reduces the number of parts. The necessary seals can be integrated into the mounting flanges.

[0023] Preferably, the mounting flanges are offset from one another on a gearbox housing of the gearbox. The term gearbox housing generally encompasses the enclosure of the drilling drive assembly, wherein the mounting flanges are preferably formed on an externally accessible surface, preferably on a surface facing upwards in the installed and operating state and thus away from the side of the drilling tool, in order to facilitate access for repositioning the drive motor unit(s) and to protect the drive motor unit(s) from environmental influences during the drilling process.

[0024] Preferably, the mounting positions, preferably in the form of mounting flanges, are each detachably closable or sealed with a flange cover. The flange cover can also be used uniformly and interchangeably for both conversion stages and prevents the ingress of dirt, etc., into the gearbox at the mounting position not equipped with a drive motor unit.

[0025] It is also conceivable, provided that the mounting positions (especially the mounting flanges on a gearbox housing) for the two gearbox stages are adjacent to each other and arranged symmetrically, to extend the mounting flange of the drive motor unit by a section corresponding to the flange cover, so that the installation of the drive motor unit in the respective orientation simultaneously also closes the respective "inactive", i.e. unused and adjacent mounting position.

[0026] The gearbox inputs can each be formed uniformly by a shaft coupling or a gear connection, and the drive output element of the drive motor unit and, if present, of the additional drive motor unit, can be designed to be compatible with a detachable mechanical torque-transmitting engagement. The torque-transmitting connection can be positive-locking, material-locking, and / or friction-locking. It is particularly preferred that the connection between the drive output element and the gearbox inputs can be established via a positive-locking connection, for example, via a gear connection (spur gear, pinion, bevel gear) if the gearbox input is designed as a gear, or via a keyway connection if the gearbox input is designed as a shaft.

[0027] It is particularly advantageous if the drive output element of the drive motor unit and, if present, of the additional drive motor unit, comprises a gear, preferably a pinion, or a shaft coupling designed for releasable mechanical torque-transmitting engagement with each of the gear inputs when the drive motor unit is mounted at the respective installation position. In this case, the drive motor unit can be easily installed "as is," and no further modifications are required.

[0028] Hydraulic motors, pneumatic motors, or electric motors can be installed as drive motors in drive motor units. Hydraulic motors are particularly common in construction machinery, as these machines are equipped with the necessary hydraulic pumps and circuits as their power source. Constant speed motors or variable speed motors can be used.

[0029] It is also advantageous if the drive motor units have an integrated reduction gear or an integrated gear stage with a fixed or switchable ratio, which is located upstream of the drive output element. This allows the torque and speed characteristics to be adapted to the respective application without requiring modifications to the drill drive assembly itself (provided the design of the drive output element remains compatible with the mounting positions). Repositioning the drive motor unit then results in a further change to the torque and speed characteristics of the drill string being driven, as described.

[0030] If an angular misalignment between the drive output element and the transmission input needs to be compensated for, it is preferred that the connection be implemented via a universal joint. The universal joint arranged between the drive output element and the transmission input allows an angle between the longitudinal axes of the output shaft of the drive output element and an input shaft of the transmission to be bridged and compensated.

[0031] To ensure the universal use of the drive motor units and potentially reduce the number of parts and variants, these can be identical in terms of performance and / or connection dimensions of the mounting positions and / or each be designed as an independent unit / module and preferably be interchangeable / interchangeable on the drilling drive assembly. This ensures operational readiness on a construction site with a small number of drive motor units available, both in the event of defects and for a variety of different processing applications requiring different drive characteristics.

[0032] To simplify the conversion of the drive motor unit(s), the drilling drive assembly can include a power connection module through which the drive motor unit(s) can be supplied with power. The power connection module can be positioned so that the supply lines to the respective drive motor unit are sufficient at all mounting positions and / or allow for quick replacement via plug connections.

[0033] Preferably, the gearbox output is designed to be detachably coupled to a drilling device. Such a design can, for example, include a bearing for the (replaceable) drill string with a corresponding housing, which is integrated with or connected to the gearbox housing, in the form of a power flushing head. Alternatively, the gearbox output can also include an output unit, which can be designed as a shaft and referred to as an output shaft. Such an output unit can then be connected to the drill string via a connecting device (for example, a universal joint) in a manner known per se. Such a universal joint can bridge and compensate for any angle between the longitudinal axes of the output shaft and the drill string.

[0034] The invention also proposes a drilling rig comprising a mast and a carriage mounted on the mast so as to be movable in the longitudinal direction of the mast, which carries a drilling drive arrangement according to the invention for driving a drill string. With this drilling rig, the advantages inherent in the drilling drive arrangement and previously explained can be achieved.

[0035] Finally, the invention also proposes a method for operating such a drilling device, according to which, in order to change an output torque and / or a rotational speed of the drill string transmitted from the drilling drive arrangement to the drill string, the at least one drive motor unit with the drive output element is moved between the first mounting position and the second mounting position, such that the drive output element of the drive motor unit is coupled to the at least one first gearbox input in the first mounting position and to the at least one second gearbox input in the second mounting position for torque transmission.

[0036] The invention is further explained below with the aid of the accompanying figures. These show: Fig. 1 a drilling rig with a drilling drive arrangement; and Fig. 2 an embodiment of a drilling drive arrangement with two symmetrically arranged and parallel acting drive motor units.

[0037] In Fig. 1 A drilling rig 1 is shown, on which the drilling drive arrangement 40 according to the invention can be used and attached. However, it should be noted that the drilling rig shown here, in the form of a self-propelled construction machine, represents only an exemplary application and that the drilling drive arrangement can also be used in other construction machines and in stationary drilling equipment.

[0038] The drilling rig 1 can include a mast 20 on which a carriage 22 can be mounted so as to be movable along the length of the mast 20. The carriage 22 can carry the drilling drive assembly 40 for driving a drill string (not shown).

[0039] The drilling rig 1 can have a chassis 10, which may include an undercarriage 12 and a superstructure 14 preferably rotatably mounted thereon. The mast 20 can be pivotally mounted on the superstructure 14. By means of a swivel cylinder 18, the mast 20 can be pivoted from a substantially vertical operating position to a substantially horizontal transport position. A winch 15 can be arranged in a rear region of the superstructure 14, which receives a cable 17 leading to a pulley located in the upper region of the mast. The mast 20 can also have a masthead 24. In its operating position, the mast 20 can be positioned in front of a front region of the chassis 10. On one end of the mast, i.e., on a side facing away from the chassis 10, the mast 20 can have a guide device 26, along which the carriage 22 can be guided and moved along the mast 20.The guide device 26 preferably comprises two guide rails 30 arranged laterally in a front region of the mast 20. The carriage 22 can have several guide jaws 32, 46 which slidably engage with the guide rails 30. A feed drive 34 can be arranged on the carriage 22, which is provided for moving the carriage 22 along the mast 20. For this purpose, approximately two stationary chains 38 can be arranged on the mast 20. The feed drive 34 can be rotationally fixed to two drive pinions, which are connected to the stationary chains 38 such that, when the feed drive 34 is operated, the feed drive 34 moves together with the carriage 22 along the stationary chains 38.

[0040] The carriage 22 can therefore carry the drill drive assembly 40, which is designed for rotating a drill string. The drill drive assembly 40 can thus also be referred to as a rotary drive. The drill string can be, for example, a Kelly bar or a drill pipe, which is used to support the borehole in so-called Kelly drilling.

[0041] The drilling drive assembly 40 has at least one drive motor unit 42 (shown here only schematically) attached to it. This unit generates and provides motor torque at a drive output element of the drive motor unit 42 and feeds the motor torque as drive torque into a gearbox 41 of the drilling drive assembly 40. The gearbox 41 translates the drive torque and drive speed into higher or lower speeds, with speed and torque being inversely proportional. In one embodiment, the drilling rig 1 can, for example, be configured for displacement drilling or CSV drilling, which require a high rotational speed.

[0042] A universal joint 44 can be flanged below the drill drive assembly 40. This joint is designed to receive the drill string and transmits an output torque provided at a gearbox output to drive the drill string. It should be noted that the universal joint 44 is only used in certain situations, particularly when an angular misalignment between the longitudinal axes of an output shaft and the drill string needs to be bridged and compensated. Therefore, it can be omitted in other applications and arrangements. A drill string guide 50, attached to the mast 20, is provided below the drill drive assembly 40 and the universal joint 44 for guiding and / or securing the drill string.

[0043] In Fig. 2An embodiment of a drilling drive arrangement 40 according to the invention is shown, wherein a gearbox housing enclosing the gearbox 41 has been omitted for clarity.

[0044] The drilling drive arrangement 40 for driving a drill string has at least one drive motor unit 42a, 42b for generating and providing motor torque at a drive output element of the respective drive motor unit 42a, 42b. The drive output element of the drive motor units 42a, 42b can have a gear, preferably a pinion, or a shaft coupling, which is configured for releasable mechanical torque-transmitting engagement with each of the gearbox inputs 47a, b; 48a, b described later, when the drive motor unit 42a, 42b is mounted at one of several mounting positions A, B, C, D associated with the respective gearbox inputs 47a, b; 48a, b.

[0045] The drive motor units 42a and 42b can incorporate a hydraulic motor, a pneumatic motor, or an electric motor as the drive motor, which is housed in a casing. To change the speed or torque of the drive motor, or to adapt it for a specific application, the drive motor units 42a and 42b can include an integrated reduction gear with a fixed or switchable ratio, which is connected upstream of the respective drive output element. This is particularly useful for constant-speed motors, which operate at a constant speed and constant torque.

[0046] As shown, the drive motor units 42a, 42b are each designed as an independent unit / module and are interchangeable / interchangeable at all mounting positions A, B, C, D on the drilling drive assembly 40, or can be moved between the mounting positions. Preferably, the drive motor units 42a, 42b are identical in terms of power and / or connection dimensions at the mounting positions.

[0047] The drive motor units 42a,42b have connections for supplying energy in the form required by the respective motor principle (electricity, hydraulic fluid, compressed air), which lead, for example, to a (not shown) common energy connection module of the drilling drive arrangement 40 and can be detachably coupled via connectors.

[0048] The gearbox 41 comprises a gear transmission arrangement 43, which has at least two gearbox inputs 47a, 47b, 48a, 48b for introducing an input torque and is designed to translate the input torque in a separate gearbox train or gearbox stage and to provide it as output torque at a central gearbox output 49 for driving the drill string.

[0049] The gear arrangement 43 has a first gear stage, which runs from at least a first gear input 47a to the gear output 49 with a first gear ratio, and a second gear stage, which runs from at least a second gear input 48a to the gear output 49 with a second gear ratio, which differs from the first gear ratio.

[0050] The drive motor unit 42a is selectively movable with the respective drive output element between a first mounting position A and a second mounting position B, such that the drive output element of the drive motor unit 42a is connected in the first mounting position A with the at least one first gearbox input 47a and in the second mounting position B with the at least one second gearbox input 48a for torque transmission.

[0051] The in Fig. 2The drill drive arrangement 40 shown is symmetrically constructed and allows the use of two, preferably identically constructed, drive motor units 42a, 42b, which can feed the drive torque they generate and provide at a drive output element in parallel into the gear stages of the gear drive arrangement 43. This allows the output torque available at the gear output 49 for driving the drill string to be doubled despite the use of relatively small drive motor units.

[0052] The gear unit 43 has a further first gear input 47b, which is symmetrically designed with respect to the first gear input 47a, and a further second gear input 48b, which is symmetrically designed with respect to the second gear input 48a. The further drive motor unit 42b with the drive output element is symmetrically displaceable with respect to the first and second mounting positions A, B between a third mounting position C and a fourth mounting position D, such that the drive output element of the further drive motor unit 42b is connected to the further first gear input 47b in the third mounting position C and to the further second gear input 48b in the fourth mounting position D, so that the drive torques of the two drive motor units 42a, 42b are transmitted cumulatively / parallel to the gear output 49 of the gearbox 41 in the gear unit 43 via the respective gear stage.

[0053] It should be noted that although the illustrated embodiment features this symmetrical arrangement for the parallel use of two drive motor units, the invention is nevertheless applicable to a drilling drive arrangement with only one drive motor unit that can be moved between two mounting positions. Likewise, a modification is conceivable in which more than two drive motor units can be arranged for the parallel supply of drive torques.

[0054] The drilling drive assembly 40 is arranged in the illustration such that, via the first gear stage running from the first gear input 47a to the gear output 49, it provides a reduction in speed and thus an increase in torque. High torque is required, for example, for Kelly drilling. The second gear stage running from the second gear input 48a to the gear output 49 also provides a reduction in speed and thus an increase in torque, but this increase is lower than in the first stage (because the second gear input 48a runs directly over the shaft of the larger helical gear 51, while the first gear input 47a runs over the shaft of the smaller helical gear / pinion 52, which meshes with the larger helical gear 51).

[0055] The mounting positions A, B, C, D for the drive motor units 42a, 52b each have a (not shown) mounting flange which is compatible / suitable for a counter flange of the respective drive motor unit 42a, 42b, wherein the mounting flanges are offset from each other on an outer surface of the gearbox housing or a housing of the drilling drive arrangement and are easily accessible for repositioning / conversion of the drive motor units 42a, 42b.

[0056] The unused mounting positions B, D, preferably in the form of mounting flanges, are each detachably closed or sealed with a flange cover 45a, 45b to prevent the ingress of dirt. To move the drive motor unit 42a from the first mounting position A to the second mounting position (to change the active transmission ratio), the flange cover 45a at the second mounting position B is removed and the drive motor unit 42a, previously removed from the first mounting position, is installed in its place. Simultaneously, the drive output element of the drive motor unit 42a is decoupled from the first gear input 47a and coupled to the second gear input 48a to transmit the drive torque. In this embodiment, this is achieved by means of a detachable shaft coupling. Alternatively, the drive output element can also be a gear toothed or...The gear / pinion is designed, while the first and second gearbox inputs can have a corresponding toothing for the releasable mechanical torque-transmitting engagement. The flange cover 45a is then attached to the first mounting position A.

[0057] The output 49 of the gearbox 41 receives its output torque via a central ring gear 53 of the gear assembly 43, which is driven by the intermediate gear / pinion 54 arranged coaxially to the helical gear 51. The gearbox output 49 is designed to be detachably coupled to a drilling device.

[0058] The gear arrangement 43 of the exemplary embodiment can of course be modified and provided with further intermediate gears. The first and second gear stages run together from the helical gear 51 onwards, but, depending on the desired difference in the gear ratio of the two gear stages, they can also run separately over several gear stages and, for example, only be brought together at the ring gear 53.

Claims

1. Drilling drive arrangement (40) for driving a drill string, comprising: - at least one drive motor unit (42a, 42b) for generating and providing motor torque at a drive output element of the drive motor unit (42a, 42b); - a gearbox (41) with a gear assembly (43) which has at least two gear inputs (47a, b; 48a, b) for introducing an input torque and is configured to translate the input torque and provide it as output torque at a gearbox output (49) for driving the drill string, - wherein the gear assembly (43) comprises a first gear stage from at least one first gear input (47a, 47b) to the gearbox output (49) with a first gear ratio and a second gear stage from at least one second gear input (48a, 48b) to the gearbox output (49) with a second gear ratio, which differs from the first gear ratio,has, and - wherein the at least one drive motor unit (42a, 42b) with the drive output element is movable between a first mounting position (A) and a second mounting position (B) such that the drive output element of the drive motor unit (42a, 42b) is connected in the first mounting position (A) to the at least one first gear input (47a, 47b) and in the second mounting position (B) to the at least one second gear input (48a, 48b).

2. Drilling drive arrangement according to claim 1, - wherein the gear drive arrangement (43) has a further first gear input (47b) symmetrically designed with respect to the first gear input (47) and a further second gear input (48b) symmetrically designed with respect to the second gear input (48a), - wherein a further drive motor unit (42b) is provided for generating and supplying a motor torque at a drive output element of the further drive motor unit (42b), and - wherein the further drive motor unit (42b) is movable with the drive output element between a third mounting position (C) and a fourth mounting position (D), such that the drive output element of the further drive motor unit (42b) is in contact with the further first gear input (47b) in the third mounting position (C) and with the further second gear input (48b) in the fourth mounting position (D),so that the drive torques of the drive motor unit (42a) and the further drive motor unit (42b) in the gear drive arrangement (43) are cumulatively / parallel to the gear output (49) of the gearbox (41) via the respective gear stage.

3. Drilling drive arrangement (40) according to claim 1 or 2, wherein the mounting positions (A, B, C, D) for the drive motor unit (42a) and, if present, the further drive motor unit (42b), each have a mounting flange which is designed to be compatible / suitable for a counter flange of the respective drive motor unit (42a, 42b).

4. Drilling drive arrangement (40) according to claim 3, wherein the mounting flanges are offset from one another on a gearbox housing.

5. Drilling drive arrangement (40) according to one of claims 1 to 4, wherein the mounting positions (A,B,C,D), preferably in the form of the mounting flanges, are each detachably lockable or closed with a flange cover (45a,45b).

6. Drilling drive arrangement (40) according to one of claims 1 to 5, wherein the gear inputs (47a,b;48a,b) are each formed uniformly by a shaft coupling or a toothing and the drive output element of the drive motor unit (42a) and, if present, of the further drive motor unit (42b), is designed to be compatible with a releasable mechanical torque-transmitting engagement.

7. Drilling drive arrangement (40) according to any one of claims 1 to 6, wherein the drive output element of the drive motor unit (42a) and, if present, of the further drive motor unit (42b), comprises a gear, preferably a pinion, or a shaft coupling, which is configured for releasable mechanical torque-transmitting engagement with each of the gear inputs (47a,b;48a,b) when the drive motor unit (42a,42b) is mounted at the respective mounting position (A,B,C,D).

8. Drilling drive arrangement (40) according to any one of claims 1 to 7, wherein the drive motor unit (42a), and, if present, the further drive motor unit (42b), comprises a hydraulic motor, a pneumatic motor or an electric motor.

9. Drilling drive arrangement (40) according to any one of claims 1 to 8, wherein the drive motor unit (42a) and, if present, the further drive motor unit (42b) has an integrated reduction gear with a fixed or switchable transmission (which is upstream of the respective drive output element).

10. Drilling drive arrangement (40) according to one of claims 1 to 9, wherein the drive motor unit (42a) and, if present, the further drive motor unit (42b), are each designed as an independent unit / module and are preferably interchangeable / interchangeable on the drilling drive arrangement.

11. Drilling drive arrangement (40) according to one of claims 1 to 10, wherein the drilling drive arrangement (40) has an energy connection module via which the drive motor unit (42a) and, if present, the further drive motor unit (42b) is / can be supplied with energy.

12. Drilling drive arrangement (40) according to one of claims 2 to 11, each in combination with claim 2, wherein the drive motor unit (42a) and the further drive motor unit (42b) are identically designed with regard to power and / or connection dimensions of the mounting positions.

13. Drilling drive arrangement (40) according to one of claims 1 to 12, wherein the gearbox output (49) of the gearbox (41) is designed to be detachably coupled to a drilling device.

14. Drilling rig (1) comprising - a mast (20), and - a carriage (22) mounted on the mast (20) to be movable in the longitudinal direction of the mast (20), which carries a drilling drive arrangement (40) according to one of claims 1 to 13 for driving a drill string.

15. Method for operating a drilling rig (1) according to claim 14, characterized by thatTo change an output torque and / or a rotational speed of the drill string transmitted from the drill drive arrangement (40) to the drill string, the at least one drive motor unit (42a,42b) with the drive output element is moved between the first mounting position (A,C) and the second mounting position (B,D) such that the drive output element of the drive motor unit (42a,42b) is coupled to the at least one first gear input (47a,b) in the first mounting position (A,C) and to the at least one second gear input (48a,b) in the second mounting position (B,D) for torque transmission.

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