Rotary drive arrangement for drill rods

Abstract

To provide a rotary drive arrangement for a drill rod which is compact in a constitution, and particularly efficient in usability.SOLUTION: A rotary drive arrangement related to this invention is for a drill rod having an outer pipe and an inner rod, in which at least a part of the inner rod extends into the outer pipe, in particular, a drill rod for double-head and / or over-burden drilling. The rotary drive arrangement has a first gear box for driving the inner rod in a rotation manner, and a second gear box for driving the outer pipe in a rotation manner. The first gear box and the second gear box are independent from each other. According to this invention, the first gear box and the second gear box are supported in a common gear box housing, and surrounded by the housing.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a drill rod having an outer pipe and an inner rod according to the preamble of claim 1, wherein the inner rod extends at least partially into the outer pipe, in particular a rotary drive arrangement for a double-head and / or overburden drilling drill rod, and a first gear for driving the inner rod in a rotatable manner mechanism and a second gear for driving the outer pipe in a rotatable manner mechanism and having these first gears mechanism and second gears mechanism relates to a rotary drive arrangement that is independent of each other

Background Art

[0002] This type of rotary drive arrangement is known, for example, from Patent Document 1. In this known rotary drive arrangement, a total of three rotary drives are provided above a substantially annular gear mechanism unit for driving the inner rod, and as a result, a compact overall configuration is achieved. The annular gear mechanism unit for driving the outer pipe is arranged at a certain distance below the gear mechanism unit for the inner rod. These spatially separated gear mechanism units are connected to each other via a support column

[0003] Such a rotary drive arrangement is used in a drilling device for driving a double-head drilling or overburden drilling drill rod. This drill rod has an inner rod with a drilling tool, and has an outer pipe with another annular drilling tool in a state of coaxially surrounding the inner rod. The inner rod and the outer pipe can be driven in the same direction and in the opposite direction, and can be driven at the same torque and rotational speed or at different torques and rotational speeds. As a result, a borehole can be efficiently created in the ground or in rock

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] European Patent No. 1936109 Specification (B1) [Patent Document 2] German Patent Application Publication No. 19906687 Specification (A1) [Patent Document 3] European Patent Application Publication No. 2634363 Specification (A1) [Patent Document 4] European Patent Application Publication No. 1124037 Specification (A1) [Summary of the Invention] [Problems to be Solved by the Invention]

[0005] The fundamental object of the present invention is to disclose a rotary drive arrangement for a drill rod that has a compact configuration and is extremely efficient to use.

[0006] This object is achieved by a rotary drive arrangement having the features of claim 1. Preferred embodiments of the present invention are described in the dependent claims. [Means for Solving the Problems]

[0007] The features of the rotary drive arrangement according to the present invention are that the first gear mechanism and the second gear mechanism are supported and thereby surrounded within a common gear mechanism housing.

[0008] As a result, a particularly compact rotary drive arrangement is realized. This reduces the consumption of materials required for manufacturing and reduces the total weight of the rotary drive arrangement. This is a significant advantage when used on a drilling device. Usually, since the rotary drive arrangement is moved along a vertical mast and such a mast can be 10 to 20 meters or more in length, reducing the weight of the rotary drive arrangement variably supported on that mast means an increase in the inclination resistance of the device. In addition, the compactness of the configuration can effectively increase the displacement distance of the drill rod.

[0009] When pulling out the drill rod from the borehole, the rotary drive arrangement must be pulled out by a pulling means, usually a winch. Therefore, reducing the weight of the rotary drive arrangement also causes a reduction in the load during pulling out, so that the pulling force applied to the drill rod can be increased, and thus the efficiency of the drilling operation can be improved.

[0010] In a preferred embodiment of the present invention, the gear mechanism housing has a central support that extends substantially perpendicular to the drilling axis, and by means of this central support, the gear mechanism housing has a first gear mechanism compartment facing away from the drilling tool side and a second gear mechanism compartment facing the drilling tool side. Since it is an arrangement provided with such a central support, these two gears mechanism can be arranged so that they are largely functionally separated from each other, and since these gears mechanism are arranged on both sides of the central support, a good force distribution is realized and a particularly stable housing configuration is brought about.

[0011] In a further preferred development of the present invention, the central support has a passage for the inner rod. According to this configuration, the inner rod can be projected further rearward from the drilling tool side through the central support. By the function of the passage, the two gearsmechanism Since the compartments are fluidly connected, for example, a common gear mechanism can be oil-filled. At the rear side away from the drilling tool side, the gear mechanism housing can be sealed against the inner rod by simple sealing means. The gear mechanism housing can, on the one hand, be sealed against the inner rod towards the drilling tool side by sealing means, and on the other hand, can be sealed against the outer rod or the output unit for the outer rod by further sealing means.

[0012] According to an embodiment of the present invention, advantageously, the first gear for driving the inner rod mechanism is the first gear mechanism arranged in the compartment, and the second gear for driving the outer pipe mechanism is the second gear mechanism arranged in the compartment. In particular, this arrangement provides the possibility of displacement of the inner rod relative to the outer pipe, so that the inner rod can be moved towards the rear side with respect to the gear mechanism housing. Due to such displacement ability of the inner rod relative to the outer pipe, the drilling tool on the inner rod can be arranged at the same height as the drilling tool on the outer rod, and depending on the individual drilling method, can be arranged ahead or behind it.

[0013] According to a further development, the gear mechanism housing has at least one first inlet opening for at least one first drive shaft provided in at least one first rotary drive and at least one second inlet opening for at least one second drive shaft provided in at least one second rotary drive, thereby further improving the compactness of the rotary drive arrangement. Preferably, two for the outer pipe dA live shaft is provided with one drive shaft for the inner rod. However, in any case, two or several drive shafts can be provided for the outer pipe and the inner rod. Basically, the inner rod could be driven by two drive shafts while the outer pipe could be driven by only one drive shaft.

[0014] In this arrangement, at least one first inlet opening is located on one side of the central support, and at least one second inlet opening is provided on the opposite side of the central support within the gear mechanism housing, thereby further improving compactness and force distribution. Preferably, by doing so, the gear existing between the mast or rig on which the rotary drive arrangement is arranged and the drilling axis mechanism A part of the housing where the inlet opening for the drive shaft within the housing is located. mechanism will be located.

[0015] According to a further embodiment of the present invention, the first gear mechanism has a first spur gear wheel, and / or the second gear mechanism has a second spur gear wheel, and they are each rotatably supported within the gear mechanism housing, so that extremely good force transmission is achieved. Each of these spur gear wheels can be meshingly connected by the action of corresponding teeth on the drive pinions of individual drive shafts.

[0016] In relation to this, arranging a first output element for driving the inner rod on the first spur gear wheel and connecting the first output element to the inner rod in such a way that it can be displaced axially while having torque transmissible is particularly advantageous. That is, external teeth with a certain axial extension are provided on the outside of the inner rod, and by making the axial extension longer than the width of the spur gear wheel, axial displacement of the first spur gear wheel with respect to it becomes possible. As a result, the inner rod is connected to the first gear mechanismOn the other hand, it can be axially displaced, and furthermore, torque transmission can be simultaneously performed.

[0017] In another preferred embodiment of the present invention, a second output element for driving the outer pipe is implemented on the second spur gear wheel, and the outer pipe is torqued on the second output element transmissible It can be implemented in a feasible manner. In this case, the second output element can be particularly a flange-like mounting element, and an outer pipe, more specifically a drill pipe, can be detachably mounted thereon.

[0018] According to a further development of the present invention, the gear mechanism housing is arranged on the base plate, and the rotary drive is also arranged on the base plate, so that a more particularly compact configuration is realized. That is, the rotary drive arrangement can be provided as a unit integral with those rotary drives.

[0019] In another preferred embodiment variant of the rotary drive arrangement according to the present invention, displacement means are arranged outside the gear mechanism housing, and the displacement means are connected to the inner rod in an axially fixed but rotatable manner for the axial displacement of the inner rod relative to the gear mechanism housing. The displacement means can particularly have a positioning cylinder, more specifically a fluid pressure type positioning cylinder. On the one hand, the displacement means are held on the gear mechanism housing and firmly connected thereto. Due to the function of the rotary bearing, the displacement means are preferably connected to the rotatably driven inner rod, so that the inner rod can be continuously rotated relative to the displacement means. Preferably, for this purpose, the displacement means are located on the rear side of the gear mechanism housing away from the drilling tool side.

[0020] The present invention further relates to a drilling device having a mast or a rig, along which a drill drive carriage is supported in a displaceable area, wherein on the drill drive carriage, a rotary drive arrangement according to the present invention is arranged as described above, and the drilling device is constituted. In this case, by means of a cable tensioning system or by the action of a positioning cylinder, the drill drive carriage is supported in a displaceable manner along a vertical mast or rig that can be adjusted around several spatial axes. In particular, on the drill drive carriage, a rotary drive arrangement having a base plate can be arranged integrally with the rotary drive.

[0021] Hereinafter, the present invention will be described in more detail by means of preferred exemplary embodiments depicted in the accompanying drawings.

Brief Description of the Drawings

[0022]

Figure 1

Embodiments for Carrying Out the Invention

[0023] The role of the illustrated rotary drive arrangement 10 is to drive a double drill rod (not shown) around the drilling axis 5, and only a part of the inner rod 12 is shown. On the inner rod 12, further inner rod elements can be releasably mounted on the drilling tool side with the connecting part 14 interposed therebetween. On the connecting element 56 of the rotary drive arrangement 10, an outer pipe (not shown) can be releasably mounted coaxially with respect to the drilling axis 5.

[0024] The rotary drive arrangement 10 is a gear mechanismIt includes a housing 20 and a central support 22, and the central support 22 is provided along a central plane 21 located in a direction orthogonal to the drilling axis 5. The central support 22 is firmly connected to a base plate 26, and with the base plate 26, the rotary drive arrangement 10 can be fixed onto a drill drive carriage (not shown) provided in the drilling device.

[0025] On the central support 22, a peripheral wall portion 24 extending on both sides is provided. In contact with the peripheral wall portion 24, a first side cover 25 is mounted on the rear side away from the drilling tool, whereby the first gear mechanism compartment 31 is cased together with the first gear mechanism 40 for driving the inner rod 12. On the opposite side of the central support 22, a second side cover 28 is mounted in contact with the peripheral wall portion 24. By the second side cover, the second gear mechanism compartment 32 is cased together with the second gear mechanism 50 for driving the outer pipe. The central support 22 has a central arrangement passage 30, and the inner rod 12 passes through it and protrudes from the side of the drilling tool through the inside of the central support 22 to the rear side.

[0026] To drive the inner rod 12, a first rotary drive (not shown) having a first drive shaft 48 is arranged on the base plate 26. The first drive shaft passes through the first inlet opening 35 and protrudes into the housing 20. A first pinion 49 is provided on the first drive shaft 48 and meshes with the first external tooth spur gear wheel 42 of the first gear mechanism 40. On the side opposite to the central support 22 as seen from the first spur gear wheel 42, a sleeve-shaped first output element 44 is mounted. Inside the sleeve-shaped first output element 44, there are internal teeth 45 which engage with the external teeth 16 on the inner rod 12. The axial length of the external teeth 16 is longer than that of the internal teeth 45, thereby realizing mechanism torque transmissible connection and the axial displacement ability of the inner rod 12 with respect to the first gear mechanism 40.

[0027] Due to the axial displacement of the inner rod 12, the displacement means 60 is arranged in contact with and fixed on a sleeve-like housing shoulder 27 that continues from the first side cover 25. This displacement means has a fixing element 62, and the fixing element 62 is firmly mounted on the outside of the housing shoulder 27. In addition, a sleeve-shaped carriage 64 is provided and is connected to the inner rod 12 in an axially fixed but rotatable manner by the action of a rotary bearing 66. By the action of a lifting cylinder (not shown), the carriage 64 and thus the inner rod 12 can be axially adjusted relative to the fixing element 62, and thus relative to the gear mechanism housing 20, and a bar-shaped linear guide 68 is arranged as anti-torsion protection.

[0028] Furthermore, the inner rod 12 can be of a pipe-shaped design, in which case a well-known rotary feed-through at the rear end of the inner rod 12 can be used to feed fluid, especially concrete slurry, to the drilling tool side.

[0029] On the opposite side of the central support 22, a second gear mechanism 50 is arranged for driving an outer pipe (not shown). For this purpose, a second rotary drive (not shown) having a second drive shaft 58 is arranged on the base plate 26. The second drive shaft 58 passes through the second inlet opening 36 and projects into the housing mechanism 20. By the action of a second pinion 59 on the second drive shaft 58, torque can be transmitted to the second spur gear wheel mechanism 52 of the second gear 50. On the side opposite to the central support 22 as seen from the second spur gear wheel 52, a sleeve-shaped second output element 54 is mounted, and in contact with it, a cardan coupling element 56 is mounted via a transfer 55 for the purpose of mounting the outer pipe of the double drill rod transmissible in a torque-transmitting manner.

[0030] The inner rod 12 projects through the second output element 54. Individual ring-shaped gaps in the housing passageway are mechanism The housing 20 is sealed by a corresponding ring seal so as to be closed in an oil-tight manner.

[0031] According to the present invention, two separate gears mechanism 40, 50 that are different from each other are mechanism arranged within the housing 20 and thereby cased in an oil-tight area. As a result, a very compact rotary drive arrangement 10 is realized.

Claims

1. A drill rod having an outer pipe and an inner rod, with the inner rod extending at least partially inside the outer pipe, in particular a rotary drive arrangement for double - head and / or over - burden drilling drill rods, a first gear mechanism for driving the inner rod in a rotatable manner, a second gear mechanism for driving the outer pipe in a rotatable manner, wherein the first gear mechanism and the second gear mechanism are independent rotary drive arrangements from each other, the first gear mechanism and the second gear mechanism are supported and thereby surrounded within a common gear mechanism housing, the gear mechanism housing has a central support extending substantially perpendicular to the drilling axis which is the rotational axis of the drill rod, and by means of the central support, the gear mechanism housing is partitioned into a first gear mechanism compartment located on the side away from the drilling tool side and a second gear mechanism compartment located on the drilling tool side, the first gear mechanism and a first rotary drive for rotationally driving the inner rod via the first gear mechanism are arranged on the side away from the drilling tool side of the central support, and the second gear mechanism and a second rotary drive for rotationally driving the outer pipe via the second gear mechanism are arranged on the drilling tool side of the central support, On the side of the central support away from the drilling tool side, displacement means are arranged outside the gear mechanism housing, and the displacement means are connected to the inner rod in an axially fixed but rotatable manner for axial displacement of the inner rod relative to the gear mechanism housing, a rotary drive arrangement.

2. A rotary drive arrangement according to Claim 1, wherein the central support has a passage for the inner rod.

3. A rotary drive arrangement according to Claim 1, wherein the first gear mechanism for driving the inner rod is arranged within the first gear mechanism compartment, and the second gear mechanism for driving the outer pipe is arranged within the second gear mechanism compartment.

4. A rotary drive arrangement according to Claim 1, The gear mechanism housing has a first inlet opening for a first drive shaft provided in the first rotary drive and a second inlet opening for a second drive shaft provided in the second rotary drive, and is a rotary drive arrangement.

5. A rotary drive arrangement according to claim 4, wherein the first inlet opening is located on one side of the central support, and the second inlet opening is provided on the opposite side of the central support in the gear mechanism housing, and is a rotary drive arrangement.

6. A rotary drive arrangement according to claim 1, wherein the first gear mechanism has a first spur gear wheel and / or the second gear mechanism has a second spur gear wheel, and they are each rotatably supported within the gear mechanism housing, and is a rotary drive arrangement.

7. A rotary drive arrangement according to claim 6, wherein a first output element for driving the inner rod is arranged on the first spur gear wheel, and the first output element is connected to the inner rod in a manner that can transmit torque but is axially displaceable, and is a rotary drive arrangement.

8. A rotary drive arrangement according to claim 6, wherein a second output element for driving the outer pipe is mounted on the second spur gear wheel, and the outer pipe can be mounted on the second output element in a manner that can transmit torque, and is a rotary drive arrangement.

9. A rotary drive arrangement according to claim 4, wherein the gear mechanism housing is arranged on a base plate, and the first rotary drive and the second rotary drive are also arranged thereon, and is a rotary drive arrangement.

10. A rotary drive arrangement according to claim 1, wherein the central support is firmly connected to a base plate that fixes the rotary drive arrangement on a drill drive carriage provided in a drilling device.

11. A drilling device having a carriage support structure for supporting a drill drive carriage, wherein the drill drive carriage is supported in a displaceable manner along the carriage support structure, and a rotary drive arrangement according to claim 1 is arranged on the drill drive carriage.

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