Drilling machine driving device

Abstract

The invention relates to a drill drive for driving an earth-boring tool, comprising: at least one drive motor having a motor housing and a motor shaft, a drive torque generated in the motor housing being transmittable by the motor shaft; and a transmission downstream of the drive motor and configured to convert the drive torque wherein the transmission includes an input transmission element receiving the drive torque from the motor shaft of the drive motor and an output transmission element receiving the drive torque from the motor shaft of the drive motor. The drive torque converted by the transmission may be transmitted to the earth-boring tool or drill string by means of the output transmission element. According to the invention, it is provided that the motor shaft of the drive motor is at least partially formed as a hollow shaft having an inner insertion space on which at least one first torque-transmitting element is formed, and that the input transmission element of the transmission has a transmission gear and an insertion shaft, at least one second torque transmission element is formed on the insertion shaft, and the insertion shaft is releasably and axially inserted into the inner insertion space of the motor shaft in a matched manner to form an anti-torque connection.

Description

Technical Field

[0001] According to the preamble of claim 1, the present invention relates to a drilling rig drive device for driving a drilling tool, the drilling rig drive device having at least one drive motor having a motor housing and a motor shaft, wherein a drive torque generated in the motor housing can be transmitted by the motor shaft, and the drilling rig drive device having a transmission device downstream of the drive motor and configured to convert the drive torque, wherein the transmission device includes an input transmission element and an output transmission element, the input transmission element receiving the drive torque from the motor shaft of the drive motor, and the drive torque converted by the transmission device can be transmitted to the drilling tool or drill string through the output transmission element. Background Technology

[0002] Drill rig drive units are typically located at one end of the drill string away from the borehole and can move along the drill frame, as known from, for example, DE 3247202C1. For static reasons only, a compact design is desirable for drill rig drive units.

[0003] Known drilling rig drive mechanisms can be found, for example, in DE 19906687B4. The device taught therein is a drilling rig for producing boreholes, having two independently operable drive motors that transmit torque to an inner or outer tube via a transmission mechanism. To transmit power from the motors to the transmission mechanism, the drive motors have motor shafts projecting from the motor housing, with insert shafts bearing pinions or gear pinions directly attached to, or in particular screwed onto, the motor shafts. The drilling rig also includes additional gears through which torque is transmitted from the corresponding gear pinions to the outer or inner tube.

[0004] DE 4402487A1 describes a drilling unit for deep hole drilling in which two actuators are arranged axially offset from each other and act directly or indirectly on an inner or outer tube. In this case, the complex structure consisting of several actuators and gears is prone to error and requires a high level of maintenance. The arrangement of at least one motor on the side of the tube also results in increased space requirements in the side region.

[0005] DE 19704263C1 also discloses a drilling rig in which a rotary drive with an output shaft directly drives one rod and drives another rod via a transmission. The drive, configured as a hydraulic motor, has a motor shaft protruding from the drive housing, on which a coupling is arranged to form a connection to the actual drilling rig drive shaft. Summary of the Invention

[0006] The purpose of this invention is to provide a drilling rig drive device that enables particularly efficient use in driving drilling tools.

[0007] This objective is achieved by a device having the features of claim 1. Preferred embodiments of the invention are set forth in the dependent claims.

[0008] The device for driving a drilling tool according to the invention is characterized in that the motor shaft of the drive motor is at least partially configured as a hollow shaft having an internal insertion space, on which at least one first torque transmission element is formed, and the input transmission element of the transmission device has a gear with an insertion shaft, on which at least one second torque transmission element is formed, wherein the insertion shaft is releasably and axially inserted into the internal insertion space of the motor shaft in a mating manner to form an anti-torque connection.

[0009] The basic idea of ​​this invention can be seen from the fact that a motor shaft, at least partially configured as a hollow shaft, simplifies and makes power transmission more efficient. By forming a hollow space within the motor shaft, the torque of the drive can be transmitted particularly reliably and efficiently through the introduction of an insert shaft, although assembly work is reduced. In contrast to previous drilling rig drives, the frictional engagement connection with subsequent components therefore takes place within the motor shaft of the drive motor. Besides saving material and weight, this also improves maintenance because the motor shaft is particularly easy to separate from the rest of the system.

[0010] The basic idea of ​​the invention can also be seen from the connection of the transmission device to the motor via an insert shaft, which is inserted into the hollow shaft of the motor shaft. Therefore, torque is transmitted from the motor to the transmission device via the insert shaft. Compared to previous drilling rig drives, a particularly compact arrangement of the transmission device, motor shaft, and motor can be achieved because the insert shaft extends directly from the transmission device into the motor shaft. Therefore, the transmission device can be directly mounted on the drive motor, and the motor shaft hardly needs to protrude from the motor housing, or preferably not at all. This shortens the axial installation length of the drilling rig drive. In addition to the advantageous power transmission, an increased installation length of the drill string and / or an extended axial travel path of the drilling rig drive along the drill frame or drilling rig carriage mount can thus be achieved. Because the smaller the axial range of the drilling rig drive in the direction of the drilling rig axis, the longer the installation length of the drill string and / or the axial travel path of the drilling rig drive along the drill frame or drilling rig mount can be.

[0011] A preferred embodiment of the invention involves at least one drive motor and transmission device arranged on a drive carriage equipped with a linear guide, by which the drive carriage can slide along a guide of the drill frame or drill rig carriage mount. During drilling operations, the drill frame is substantially vertical, with a certain tilt angle adjustable, while the drill rig mount is spatially adjustable to a considerable extent by means of a generally known support arm mechanism. Such a drill rig carriage mount is particularly suitable for anchor drilling in anchor drilling rigs. The linear guide is formed along the drill frame or drill rig mount, along which the drive carriage with a compact drill rig drive unit can slide. The drive carriage can be used to precisely adjust the drill rig drive unit in the desired drilling direction, wherein the drill rig drive unit according to the invention is particularly suitable for oscillating and adjusting movements due to its compact arrangement.

[0012] Particularly preferred is that several drive motors, together with a transmission, are specifically arranged on the drive carriage. Two or more drive motors can be formed on the drill drive unit. Parallel shaft transmissions, particularly spur gear transmissions or planetary transmissions, can be used as the transmission. Preferably, the drive motors can each drive the drill pipe and / or drill tool independently. For this purpose, the drill pipe can be configured as a double-ended drill pipe with an inner tube and an outer tube. It is useful to provide separate drive motors for rotating the inner and outer tubes, wherein the inner and outer tubes can be driven in the same or preferably opposite directions of rotation. In principle, the drive motors can be arranged in any position on the drive carriage, for example, axially one behind the other, or particularly side by side. This enables particularly efficient drilling operations.

[0013] In principle, the drive motor can have any design. According to the invention, a particularly reliable structure is achieved because the drive motor is configured as an electric motor or a hydraulic motor, particularly as an axial piston motor. Preferably, a brushless electric motor can be used. The drive motor can also have a control unit specifically configured to control speed and torque. By designing the drive motor in this way, the drilling rig drive unit can be designed to be smaller and more compact, which significantly facilitates operation in typically limited construction and operating spaces, preferably at the construction site.

[0014] Another advantageous embodiment of the invention is that the insertion space extends from the free end of the motor shaft to the region of the motor shaft located within the motor housing. The free end of the motor shaft may thus include an outer circumferential region and / or an axial end region of the motor shaft. Advantageously, the insertion cross-section is formed as rectangular or slightly rounded, particularly circular. The insertion cross-section may also have serrations and / or fixed corners, thereby ensuring a particularly secure connection to the insertion space in the free end of the motor shaft.

[0015] Another advantageous embodiment of the invention is that the insertion shaft, which is inserted into the insertion chamber, is mostly located inside the motor housing. Preferably, the motor shaft does not protrude from the motor housing. Therefore, the shaft connection is mostly or completely located inside the motor housing, resulting in a particularly compact structural form.

[0016] The insertion shaft can pass completely or partially through the drive motor. It may be particularly advantageous that the insertion shaft passes through at least half, preferably at least two-thirds, of the rotor of the electric drive motor during insertion. This ensures particularly efficient power transmission from the drive motor to the insertion shaft. Generally, the insertion shaft can be formed arbitrarily. However, it is preferred that the insertion shaft also has at least one hollow body and is preferably configured as a hollow tube. Advantageously, both the motor shaft and the insertion shaft are configured entirely as cylindrical hollow bodies for the passage of the inner tube. According to a variant of the invention, it is particularly advantageous that the insertion chamber is formed as a blind hole in the motor shaft. In this way, the motor shaft can be configured as a robust and therefore particularly stable solid shaft, especially in the force-generating region of the motor. The inner surface of the insertion chamber may preferably have an elongated profile, particularly a keyway profile. It is possible that the insertion shaft can be inserted into the insertion chamber and can be locked by at least one rotational and / or longitudinal movement.

[0017] A preferred embodiment of the invention further comprises that the at least first torque transmission element and the at least second torque transmission element form a torque transmission form-fit connection. Specifically, the torque transmission elements may be configured for this purpose as teeth, grooves, bolts, and / or protrusions and recesses, and may engage with each other. The form-fit connection may preferably be configured as a splined shaft connection, a toothed shaft joint, a guide key joint, or a mating joint. According to the invention, it is particularly preferred that the insertion shaft is configured as a drive shaft. The insertion shaft may also preferably be configured as a splined shaft or a toothed shaft.

[0018] Advantageously, the insert shaft has a serrated or polygonal cross-sectional profile on its outer circumference. This means that the insert shaft-drive shaft can also be configured as a polygonal connection. In this case, it is preferable to simultaneously form different types of torque transmission elements, such as polygons and teeth.

[0019] Particularly useful is the arrangement of at least one actuator element, particularly a guide key, on the insertion shaft. Alternatively or otherwise, the insertion chamber may preferably have at least one actuator element or actuator groove, particularly a groove that mates with the guide key, for form-fit force transmission. In addition to form-fit connections, friction-fit connections and / or material-fit connections can also be used according to the invention, particularly as a supplement.

[0020] According to a variant of the invention, it is particularly advantageous to arrange a plurality of first torque transmission elements and a plurality of second torque transmission elements, wherein a spline shaft connection is formed between the insertion shaft and the motor shaft. This allows the insertion shaft to be easily inserted into the motor shaft. In this case, it is also possible to transmit particularly large and alternating torques, which is common in the field of drilling rig drives.

[0021] According to another development of the invention, it is advantageous to arrange a first drive motor with a first transmission mechanism for driving the inner drill pipe and a second drive motor with a second transmission mechanism for driving the outer drill pipe. In this case, it is particularly preferred that the drive motors are arranged axially, one behind the other. It is particularly advantageous that the inner and outer drill pipes can rotate in opposite directions. Depending on the type of application and ground conditions, this enables particularly efficient drilling.

[0022] According to the invention, a suitable development lies in a drilling rig having a support device therein, which is specifically configured to be movable and has a drill frame or carriage mount, along which a drive carriage is slidably mounted, wherein the drilling rig drive device according to the invention is arranged on the drive carriage. Using the drilling rig according to the invention, drilling depth and adjustability on the drill frame can be improved due to the particularly compact arrangement of the motor and transmission. The lower tilting moment also facilitates, for example, oscillating the drilling rig during assembly and disassembly. Attached Figure Description

[0023] The invention will now be explained in more detail with reference to the preferred exemplary embodiments schematically shown in the sole accompanying drawing. Figure 1 The accompanying drawings show a schematic cross-sectional view of a drilling rig drive device according to the present invention, which includes a drive motor, a transmission device and an insertion shaft. Detailed Implementation

[0024] Figure 1The drilling rig drive shown has a drive motor 14 and a transmission 26. As shown here, a motor housing 18 can preferably be formed, which substantially encloses or houses the drive motor 14. The motor housing 18 can preferably form a housing unit wholly or partially with the transmission housing and can be configured to house the drive motor 14 and the transmission 26. In this case, the motor shaft 22 preferably does not protrude from the motor housing 18, or at most slightly protrudes. The motor shaft 22 is set to rotate during operation. The motor shaft 22 can preferably have an insertion chamber 38 with a rectangular or polygonal cross-section, and as shown here, the insertion shaft 36 is preferably inserted into the insertion chamber 38. The force generated in the drive motor 14 is transmitted to the motor shaft 22 and from there to the insertion shaft 36 via torque transmission elements 46 and 42. The transmission element 42 of the inner insertion chamber 38 and the torque transmission element 46 of the insertion shaft can preferably be arranged on opposite sides and / or offset in this case.

[0025] like Figure 1 As shown, torque can preferably be transmitted via an insertion shaft 36 inserted into the insertion space 38 of the hollow shaft 34 of the motor shaft 22, and from there directly to the transmission 26. According to the invention, the insertion shaft 36 can preferably have a connecting element for performing a switching operation, wherein the connecting element is configured to disengage the drive motor 14 and the transmission 26. In this respect, the drilling rig drive 10 according to the invention can be particularly configured for switching operations and / or for speed regulation.

[0026] As shown in the figure, the transmission device 26 can preferably have a transmission input element 30 with at least one transmission gear 28, particularly a sun gear. Specifically, in this case, the insert shaft 36 can form a unit with the transmission gear 28. Generally, the transmission device 26 can have any configuration, but is particularly suitable as a planetary transmission, spur gear transmission, bevel gear transmission, and helical gear transmission to accommodate rotational variables, particularly rotational speed and torque, as needed. In the transmission device 26 shown as an example in the figure, the input and output shafts are coaxially aligned. However, the input and output shafts of the transmission device 26 can also preferably be tilted at an angle or offset parallel to each other. As shown here, torque can preferably be transmitted to the output transmission element 32 in this case, and then via an external gear (particularly a planetary gear) radially relative to the insert shaft 36 to the drilling tool or drill string. In this case, the output transmission element 32 can be particularly configured as a shaft.

[0027] According to the drilling rig drive device 10 according to the invention, the drive motor 14 and the transmission device 26 can preferably be substantially directly adjacent to each other, as shown in the exemplary embodiment illustrated in the figures. In this case, the distance between the transmission device 26 and the drive motor 14 can preferably be less than 50 mm, particularly 25 mm. A protective space can preferably be provided between the drive motor 24 and the transmission device 26, wherein the protective space is formed at least between the transmission device, the drive motor, and the drive shaft. This can reduce the ingress of foreign objects and improve the thermal characteristics of the drilling rig drive device 10.

Claims

1. A rig drive (10) for driving a drilling tool, having - at least one drive motor (14) having a motor housing (18) and a motor shaft (22), wherein a drive motor (14) which is arranged in a motor housing (18) and is configured to generate a drive torque, - a transmission (26) which is arranged downstream of the drive motor (14) and is configured to convert the drive torque, wherein the transmission (26) comprises an input transmission element (30) which receives the drive torque from the motor shaft (22) of the drive motor (14), and an output transmission element (32) by means of which the drive torque converted by the transmission (26) can be transmitted to the drilling tool or to a drill string, characterized in that the motor shaft (22) of the drive motor (14) is formed at least partially as a hollow shaft (34) having an internal insertion space (38), at least one first torque transmission element (42) is formed on the hollow shaft (34), and wherein the input transmission element (30) of the transmission (26) has a transmission gearwheel (28) and an insertion shaft (36) on which at least one second torque transmission element (46) is formed, wherein the insertion shaft (36) is releasably inserted in a matching manner axially into the internal insertion space (38) of the motor shaft (22) to form a torque-proof connection.

2. The rig drive (10) according to claim 1, characterized in that the at least one drive motor (14) and the transmission are arranged on a drive carriage which is formed with linear guides with which the drive carriage can be slid along guides of a drill carriage or rig carriage mount.

3. The rig drive (10) according to claim 1 or 2, characterized in that in particular several drive motors and gearwheels are arranged on the drive carriage.

4. The rig drive (10) according to any one of claims 1 to 3, characterized in that the drive motor is configured as an electric motor or as a hydraulic motor, in particular as an axial piston motor.

5. The rig drive (10) according to any one of claims 1 to 4, characterized in that the insertion space (38) extends from a free end of the motor shaft (22) up to a region of the motor shaft (22) which is located within the motor housing (18).

6. The rig drive according to claim 5, characterized in that the insertion shaft (36) inserted into the insertion chamber (38) is located mainly within the motor housing (18).

7. The rig drive according to any one of claims 1 to 6, characterized in that the insertion space (38) is formed as a blind hole in the motor shaft (22).

8. The rig drive (10) according to any one of claims 1 to 7, characterized in that the at least first torque transmission element and the at least one second torque transmission element form a torque transmission form-fit connection.

9. Rig drive (10) according to any one of claims 1 to 8, characterized in that a number of first torque transmission elements and a number of second torque transmission elements are arranged, wherein a spline recess-shaft connection is formed between the insertion shaft and the motor shaft.

10. Rig drive (10) according to any one of claims 1 to 9, characterized in that a first drive motor with a first transmission is arranged for driving an inner drill string and a second drive motor with a second transmission is arranged for driving an outer drill string.

11. Rig having a carrier device, which is in particular configured to be mobile, and a drill stand or carriage mounting, along which a drive carriage is slidably mounted, characterized in that a rig drive according to any one of claims 1 to 10 is arranged on the drive carriage.

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