Drive and operating method of a drive for a soil drilling device

Abstract

Drive and operating method of a drive for a soil drilling device. The invention relates to a drive for a soil drilling device for the insertion, by push or pull, of a drill string comprising a frame and a carriage capable of reciprocating movement relative to the frame, at least one hydraulic cylinder being arranged between the frame and the carriage for the movement of the carriage, and the hydraulic cylinder being able to be arranged between the frame and the carriage in a detachable manner for two different working directions. Figure to be published with the abstract: Fig. 2

Description

Title of the invention: Drive and method of operating a drive of a ground drilling device

[0001] The invention relates to a drive of an earth drilling device for the pushing or pulling insertion of a drill string, to a method of operating a drive of an earth drilling device for driving a drill string into the ground in the pushing or pulling working direction and to a use of a drive of an earth drilling device for the pushing or pulling insertion of a drill string.

[0002] It is known to use a drive of an earth drilling device for the push or pull introduction of a drill string, in which a push-pull drive engages via coupling means on projections or in recesses of a drill string provided with a tool at the end. For example, a drilling device is described in DE 196 08 980 C2, which device consists of a carriage provided with a hydraulic piston-cylinder unit which drives a carriage with a linear reciprocating movement. The carriage is connected to a ratchet which, when the carriage is moved forward, engages from the rear with a rung of a ladder-type rod, which is part of a drill string, and thus moves the ladder-type rod forward in the drilling direction with the drill head corresponding to the stroke of the hydraulic piston-cylinder unit.At the end of the stroke, the pawl automatically detaches from the rung and the carriage returns to its starting position. Due to the high forces, the hydraulic piston-cylinder unit is firmly connected to the carriage and to a frame on the carriage.

[0003] As a hydraulic piston-cylinder unit or linear drive, the use of a double-acting hydraulic cylinder is described in DE 198 49 611 CL. In this case, both cylinder chambers can be connected to a pressure source via a respective hydraulic line with a 4 / 3-way valve, between which a two-way valve with a pressure gauge measuring the respective instantaneous pressure is connected, which switches the 4 / 3-way valve via a control device when the maximum pressure is reached and in this case connects one or the other of the hydraulic lines to the pressure source.

[0004] The aim of the invention is to provide an improved possibility for a drive of a ground drilling device, a method of operating a drive of a ground drilling device and a use of a drive of a ground drilling device, by means of which a drill string can be moved in both directions inexpensively, in particular without expensive pressure regulation measures, in a simple configuration, in particular with a small footprint, and / or efficiently, in particular with all available force.

[0005] The invention has made it possible to identify a preconceived idea against which action must be taken. Contrary to the prevailing opinion that a firm connection of the hydraulic piston-cylinder unit or the hydraulic cylinder was generally considered absolutely necessary, it has been recognized that a connection, detachable at least on one side, of a hydraulic cylinder between the frame and the carriage of the earth drilling device is possible. Thus, a hydraulic cylinder can be arranged between the frame and the carriage in a detachable manner in two different working directions. It has been recognized that a hydraulic cylinder can, even in the region of an earth drilling device which is subjected to extreme conditions, be rotated simply with respect to its working direction, without detaching firm connections, i.e. in particular material connections.In particular, it has been recognized that in the case of arrangement of the hydraulic cylinder between the frame and the carriage, after a rotation of the hydraulic cylinder transversely to its longitudinal direction, respectively for the working displacement in the case of pushing and for the working displacement in the case of pulling, always one and the same side of the hydraulic cylinder, in particular the piston side, can be subjected to pressure. Thus, in particular when using a differential cylinder, high forces are available for the working displacement or the working direction (piston surface), and high speeds are available for the idling stroke (by means of piston ring surfaces that are as small as possible or a piston rod with a large diameter). A high force for the displacement of the drill string and a high displacement speed of the hydraulic cylinder, in particular in the idling stroke, can be achieved.Furthermore, simple transport can be achieved by the detachable connection of the hydraulic cylinder to the trolley and / or the frame. In addition, simple assembly on site is possible, even in a small excavation. Complex adjustment work can also be omitted. In particular, in the case of a hydraulic cylinder that comprises a cylinder tube and a piston rod, it can be provided that the cylinder or cylinder tube of the hydraulic cylinder always remains connected to the trolley and that the piston rod can be detachably attached to two different regions of the frame in both working directions. This results in a considerable advantage for the user, since the achievable advantages could not be achieved until now. Simplicity of construction, transport, assembly, adjustment and / or the efficiency of the working method with regard to both working directions can lead to increased efficiency.

[0006] The invention relates to a drive for a ground drilling device for the insertion by pushing or pulling of a drill string comprising a frame and a carriage which can be driven in a reciprocating movement relative to the frame, at least one hydraulic cylinder being arranged between the frame and the carriage for moving the carriage. The hydraulic cylinder can be arranged between the frame and the carriage in a detachable manner in two different working directions.

[0007] The term "drill string" includes within the meaning of the description an earth drilling tool and a string comprising rods, which can be moved by means of an earth drilling device or a driving device to carry out drilling through the earth.

[0008] The term "rod" encompasses within the meaning of the description not only exclusively a rod comprising individual, rigid rod sections connected to each other directly or indirectly, but also in particular all force transmission elements which can be used in an earth drilling device. Rigid rod sections, which can be connected in particular by means of a plug-in connection, are preferred. In a particularly preferred embodiment, a plug-in connection can be provided between two adjacent rod sections, which is fixed by means of a bolt inserted transversely to the longitudinal axis of the rod sections.

[0009] The term "rod section" within the meaning of the description encompasses an element extending along a longitudinal axis, which element is part of the rod or a drill string for drilling soil. The rod section may be designed as an element arranged at the front in the drill string and provided with an associated function (transmitter housing or the like) or be designed as an element extending (only mechanically) the drill string as a rod section. The rod section may have mechanical channels, for example for drilling fluid, electrical lines, electrical elements and / or electronic elements.

[0010] In a preferred embodiment, a rod section within the meaning of the description may have an outer diameter of 25 mm to 65 mm, preferably 30 mm to 60 mm, preferably 35 mm to 55 mm, preferably 40 mm to 50 mm. In a preferred embodiment, a rod section within the meaning of the description may have a total length of 450 mm to 650 mm, preferably 500 mm to 600 mm, preferably 520 mm to 580 mm. In a preferred embodiment, a rod section within the meaning of the description may have a useful length which takes into account in particular the length of the connecting elements, in particular provided at the ends, for example in the case of a push-fit connection a length of the connecting sleeve and / or the connecting connector. The useful length can be obtained from of the total length reduced by the length of the connecting element(s) and be 400 mm to 600 mm, preferably 450 mm to 550 mm, preferably 475 mm to 525 mm. In a preferred embodiment, a rod section within the meaning of the description may comprise a groove for the engagement of an engagement element for moving the drill string, for example a (locking) ratchet which may have an outer diameter of 15 mm to 55 mm, preferably 20 mm to 50 mm, preferably 25 mm to 45 mm, preferably 30 mm to 40 mm. In a particularly preferred embodiment, the total length of the rod section may be 550 mm and the outer diameter of the rod section may be 45 mm. In a particularly preferred embodiment, the useful length of the rod section may be 500 mm.In a particularly preferred embodiment, the outer diameter of a groove for the engagement of an engagement element for moving the drill string may have an outer diameter of 35 mm. In the case of the values ​​given for the outer diameter of the rod section, the (total) length of the rod section, the usable length of the rod section and the outer diameter of a groove on the rod section, these are no values ​​limiting the corresponding dimensions; it should be emphasized that an adaptation to the external conditions, in particular the size of the excavation or shaft for the arrangement of the earth drilling device and / or to the condition of the ground, can take place in order to carry out earth drilling efficiently.

[0011] The term "earth drilling tool" includes a drilling head arranged at the front end of the drill string, in which head movable parts may be provided. The drilling tool may, however, also have a non-moving or even rigid or to a very large extent non-moving or even rigid outer contour.

[0012] The term "earth drilling device" encompasses within the meaning of the description any device which can move in particular a drill string comprising rod sections in an existing or to be created channel in the ground, in order to create or widen a borehole, in particular a horizontal borehole, or to insert lines or other long bodies into the ground. An earth drilling device may in this case comprise a drive or a drive device driving a drill string in tension and / or compression. Alternatively or additionally, the drive may rotate the drill string in a certain angular range about the longitudinal axis of the drill string.A rotary drive is possible, whereby a reciprocating movement in the form of a rotary movement in both directions of rotation around the longitudinal axis of the drill string within a certain angular range (a so-called "paddle" operation) is also possible.

[0013] The term “horizontal drilling” within the meaning of the description encompasses in particular each type of existing or to be created channels, preferably horizontal, in a body, in particular channels in the ground including ground boreholes, rock boreholes or buried lines as well as underground or overhead tubular conduits and water channels, which can be produced or inserted by use of a corresponding ground drilling device.

[0014] The term "frame" encompasses within the meaning of the description a structural element of an earth drilling device, which can be arranged in an excavation or a shaft, in particular a canal shaft, in order to enable guidance of a reciprocating movement of a carriage relative to the frame. By means of the frame, the earth drilling device can be supported in an excavation, a shaft or upright on the ground. The frame can define a guide or a path for the reciprocating movement of the carriage. In a preferred embodiment, the frame comprises a rectangular base surface. The frame may have a length in the longitudinal extent of the hydraulic cylinder, which is preferably 550 mm to 1050 mm, more preferably 600 mm to 1000 mm, more preferably 650 mm to 950 mm, more preferably 700 mm to 900 mm, more preferably 750 mm to 900 mm, more preferably 800 mm to 900 mm.The frame may have a length transverse to the longitudinal extent of the hydraulic cylinder, which length is preferably 350 mm to 600 mm, more preferably 350 mm to 550 mm, more preferably 350 mm to 500 mm, more preferably 400 mm to 500 mm, more preferably 450 mm to 500 mm. The dimensions indicated may relate to the base surface, whereby a guide tube for supporting the frame in the excavation or shaft may be provided in addition to the frame, in particular in the extent transverse to the longitudinal direction of the hydraulic cylinder, from which guide tube support elements can be extended and brought into abutment relative to the excavation or shaft.

[0015] The term "carriage" as used in the description encompasses an element of the earth drilling device, which element is an engagement element for engagement with the drill string and which is movable back and forth relative to the frame.

[0016] In a preferred embodiment, the hydraulic cylinder can be connected in a form-fitting manner to the carriage and / or the frame in both different directions by inserting or inserting the hydraulic cylinder into receptacles on the carriage and / or the frame. Thus, the hydraulic cylinder can be simply detached from the frame or the carriage, if necessary. The direction of action of the hydraulic cylinder can be reversed or rotated in the opposite direction. Furthermore, a simple insertion or insertion of the hydraulic cylinder allows simple disassembly or simple transport of the drive. Provided that the hydraulic cylinder can be lifted out of a receptacle, thus in particular no material connections between the frame and hydraulic cylinder or carriage and hydraulic cylinder must not be detached.

[0017] In a preferred embodiment, the connection of the hydraulic cylinder to both the frame and the carriage can be simply detached and can be selectively connected. If a detachment and a connection for the carriage or the frame are described, this description can thus also be used for the respective other connection to the hydraulic cylinder. It is, however, also possible for the hydraulic cylinder to be fixed to the carriage in such a way that a simple detachment, in particular in the form of a removal or lifting of the hydraulic cylinder, is not possible; for example, it can be provided that the hydraulic cylinder can be mounted on the carriage securely in a pivotable manner about a center of rotation, so that in particular the cylinder or tube of the hydraulic cylinder remains connected to the carriage and the piston rod is detachably fixed to another region of the frame.Particularly preferably, the cylinder tube can be arranged or detachably connected in both working directions of the drive in the region of the carriage; the piston rod of the hydraulic cylinder can be detachably connected to the frame in both working directions, the piston rod being able to be, in one working direction, connected to a part of the frame which is closer to the ground borehole, and, in the other working direction, to be connected to a part of the frame which is further away from the ground borehole.

[0018] In a preferred embodiment, the hydraulic cylinder comprises a piston rod and a cylinder tube, the piston rod and / or the cylinder tube comprising

[0019] a (a) first engagement member or

[0020] a (b) housing for a second engagement element and

[0021] the carriage and / or the frame comprising

[0022] a (a) housing for the first engagement element or

[0023] the (b) second engagement element.

[0024] By means of the described embodiment, a form-fitting engagement which fixes the hydraulic cylinder relative to the carriage and / or the frame is possible. Due to the force acting in one direction or exerted by the hydraulic cylinder, an arrangement in terms of form-fitting engagement which is simply configured and yet allows for secure fixation can be achieved.

[0025] In a preferred embodiment, the first engagement element and / or the second engagement element are a groove formed between two limiting surfaces, the groove, the housing and the limiting surfaces being adapted to each other in such a way that a form-fitting engagement in the longitudinal direction of the piston rod and / or the cylinder tube can be achieved. Thus, a simple geometric configuration of the elements for the engagement of the cylinder hydraulic and frame and / or hydraulic cylinder and carriage is possible. The production of a groove with corresponding limiting surfaces as well as an engagement element that is adapted to the groove provides a simple construction option for the drive configuration.

[0026] In a preferred embodiment, a receptacle adapted to the cylinder or cylinder tube is provided on the carriage. In this case, it may be provided that the dimension or length of the receptacle substantially coincides with the length of the cylinder or cylinder tube or the spacing of two structural elements on the cylinder or cylinder tube, in particular stops, so that the cylinder or cylinder tube can be simply inserted into the receptacle on the carriage, in order to achieve a detachable connection of the hydraulic cylinder to the carriage. It may be provided that the receptacle on the carriage comprises two structural elements, in particular in the form of two projections which are spaced apart in the longitudinal direction of the hydraulic cylinder and each comprise a surface. The two surfaces may in particular be turned towards each other.The two surfaces can, in the case of an inserted cylinder tube, cooperate with two stops on the cylinder tube in such a way that each of the surfaces simultaneously bears against a stop on the cylinder tube, so that a fixing of the carriage relative to the cylinder tube in both directions of movement of the hydraulic cylinder can be possible. Alternatively or additionally, it can be provided that at least one, preferably two receptacles can be provided on the frame, which receptacles are adapted to a structural element of the piston rod, so that the structural element can be inserted or introduced at the frame, in order to achieve the connection of the piston rod or the hydraulic cylinder to the frame. It can be provided that at least one front receptacle is provided on the frame, into which receptacle a structural element of the piston rod can be inserted.Preferably, two front housings which are provided on front sides which are opposite to each other can be provided. The arrangement of two housings on opposite front sides is preferred, so that the connecting line of the two housings extends along both working directions. By providing a housing on one front side of the frame, the entire length of the frame can be used for the arrangement of the hydraulic cylinder.

[0027] A gripping element that can facilitate the transport and handling of the hydraulic cylinder can be implemented on the possibly provided structural elements of the cylinder tube that can be provided for attachment in the carriage housing. For example, the gripping element can be implemented as an element connecting the stops spaced apart from each other in the longitudinal direction on the cylinder tube. The planning, construction and production can be simplified. The gripping element may extend parallel to the cylinder tube and spaced therefrom.

[0028] In a preferred embodiment, the hydraulic cylinder is a differential cylinder, which presents a cost-effective possibility. Furthermore, a differential cylinder offers the possibility of being able to eliminate expensive pressure control measures. In a particularly preferred embodiment, a hydraulic cylinder can be selected, the diameter of the piston rod of which is large in relation to the piston surface, since the piston ring surface can then be small. The hydraulic cylinder can have a length of 400 mm to 650 mm, preferably 450 mm to 600 mm, preferably 500 mm to 600 mm, preferably 500 mm to 550 mm. The hydraulic cylinder can have a piston diameter of 50 mm to 120 mm, preferably 50 mm to 100 mm, in particular 70 mm.The hydraulic cylinder may have a stroke in the range of 200 mm to 350 mm, preferably 200 mm to 300 mm, more preferably 250 mm to 300 mm, in particular 270 mm. The diameter of the piston rod of the hydraulic cylinder may be in the range of 25 mm to 60 mm, preferably 25 mm to 50 mm. It is possible for the ratio of the piston diameter to the piston rod diameter to be such that for a substantially identical oil flow for both directions of movement, the speed when the piston ring surface is loaded (free stroke) is approximately twice as high as when the piston surface is loaded for the working stroke.

[0029] In a preferred embodiment, two hydraulic cylinders are provided, which are arranged symmetrically to each other with respect to the frame and / or the carriage. Thus, the force can act symmetrically between the carriage and the frame. A stable and uniform deployment of the force is possible.

[0030] In a preferred embodiment, an engagement element, for example in the form of a locking pawl, is rotatably arranged on the carriage. A locking pawl may provide a simple configuration of an engagement element, with which the drill string is brought into engagement and a force can be applied to the drill string. For engagement with the drill string, rod sections may be used, which comprise one or more recesses or grooves provided on the outer surface.

[0031] In a preferred embodiment, an element of a plug-in or screw connection for connecting a hydraulic line is formed on the cylinder tube. By means of such a configuration, transport or disassembly of the drive can be simplified, by the fact that, for example, in addition to disassembly of the hydraulic cylinder from the carriage and / or the frame, supply lines for the connection of a hydraulic line to the cylinder tube can also be disassembled.

[0032] The invention also relates to a method for operating a drive of an earth drilling device for driving a drill string into the ground in the pushing or pulling working direction comprising a frame, a carriage which can be driven back and forth relative to the frame, and at least one hydraulic cylinder between the frame and the carriage for moving the carriage relative to the frame. The hydraulic cylinder is detached from the frame and / or the carriage and rotated transversely to its longitudinal axis for reversing the working direction.Preferably, the cylinder tube can remain in the region of the carriage or be arranged there again even after rotation of the hydraulic cylinder, and the piston rod of the hydraulic cylinder can be connected to the frame in both positions, the piston rod being, in one working direction, connected to a part of the frame which is closer to the ground borehole, and, in another working direction, being connected to a part of the frame which is further from the ground borehole.

[0033] The invention also relates to a use of a drive of a ground drilling device for the insertion by pushing or pulling of a drill string comprising a frame and a carriage which can be driven in a reciprocating movement relative to the frame. A hydraulic cylinder is arranged between the frame and the carriage for moving the carriage. A selectively detachable connection of the hydraulic cylinder is used, in order to change the working direction of the drive.

[0034] The embodiments relating to individual aspects of the invention, as described with respect to the drive, the method and the use, are to be regarded as complementary embodiments. The embodiments relating to one aspect are also valid for the embodiment for one of the other aspects.

[0035] The preceding embodiments, as well as the description below of exemplary embodiments, do not constitute the abandonment of certain embodiments or features.

[0036] The invention is explained in more detail below with the aid of an exemplary embodiment shown in the drawings.

[0037] In the drawings:

[0038] [Fig-1] illustrates a ground drilling device comprising a string of rods of drilling and a drive in a side view in a partially cutaway schematic representation;

[0039] [Fig.2] illustrates a drive in a first working direction of a ground drilling device in isometric representation;

[0040] [Fig.3] illustrates the drive of [Fig.2] with a modified working direction in isometric representation; and

[0041] [Fig.4] illustrates an enlarged top view of a partial region of the drive of figures 2 and 3.

[0042] [Fig. 1] illustrates, in a side view and in a partially cutaway schematic representation, a ground drilling device 2, which is inserted into a starting excavation 3. By means of the ground drilling device 2, a drill string 5 having a ground drilling tool arranged at the front in the form of a drill head 6 can be introduced into the ground 8. In the drill string 5, a transmitter housing 7 is arranged behind the drill head 6.

[0043] The insertion by pushing or pulling of the drill string 5 is carried out by means of two hydraulic cylinders 1, which actuate a locking pawl 10 with a reciprocating movement. The locking pawl 10 is fixed to a carriage 12. The locking pawl 10 is rotatably fixed to the carriage 12 for a change of the working direction. The carriage can move relative to a frame 25 by means of an actuation of the hydraulic cylinder 1, which frame comprises on the end sides a front frame plate 20 and a rear frame plate 14. A fastening point for the detachable fastening of the hydraulic cylinder 1 is provided on the frame 25 respectively at the front frame plate 20 and at the rear frame plate 14.

[0044] For the movement of the drill string 5, the locking pawl 10 moves into the position shown in Figures 1 and 2 during the recoil (idle stroke) out of a groove 9 of the drill string 5 and, when it reaches another groove 9, falls into it, so that the hydraulic cylinder 1 can further advance the drill string 5 into the working position, as schematically shown in [Fig.2].

[0045] For a tensile working direction, shown in [Fig. 3], of the hydraulic cylinder, the latter is rotated transversely to its longitudinal direction. In this case, it is possible that the cylinder or piston side of the hydraulic cylinder 1 with the greatest force is (additionally) available for the working stroke and that the piston rod side is (still) available for a rapid return.

[0046] While [Fig.2] illustrates, for a push-in of the drill string 5, the arrangement of the hydraulic cylinder 1 relative to the carriage 12 and the frame 25, [Fig.3] illustrates a pulling working direction, the position of the hydraulic cylinder 1 being shown respectively after the working stroke is completed (cylinder extended) both in [Fig.2] and in [Fig.3].

[0047] In [Fig.2], the two hydraulic cylinders 1 are hooked by their piston rods 4 in grooves 13 of a rear frame plate 14. The piston rods comprise a recess or groove 27 which is adapted to the thickness of the frame plates 14 and 20. The groove 13 in the frame plates 14, 20 is adapted to the diameter of the piston rod 4 in the region of the groove 27. The frame plate 14 forms the fixing point for the advancement or the thrust working direction, as it can be used for example for pilot drilling.

[0048] The cylinder tubes 11 of the hydraulic cylinders 1 are hooked on the one hand by means of a groove 15, on the other hand by means of a stop 16 in projections 17 of the carriage 12, as shown in [Fig. 4], which illustrates a top view of the drive of Figures 2 and 3 in an enlarged manner. A stop 16 is provided on the cylinder tube 11 for a projection 17. The cylinder tube 11 is fixed between the projections 17 by means of the stops 16 on the cylinder tube 11. The stops 16 fix the cylinder tube 11 between the projections 17 in both working directions of the hydraulic cylinder 1. A gripping element by means of which the hydraulic cylinder 1 can be lifted out of the carriage 12 and out of the groove 13 is provided between the stops 16 for handling the cylinder tube 11 or the hydraulic cylinder 1.

[0049] In Figures 2 to 4, guide tubes 50 which extend parallel to the working direction of the earth drilling device 2 or to the direction of movement of the carriage 12 are arranged on the frame 25. Pull-out support elements, which are not shown, can be arranged in the guide tubes 50, by means of which support elements the frame 25 can be supported in the excavation or shaft.

[0050] If the piston sides of the hydraulic cylinders 1 are then subjected to pressure by means of the hydraulic plug-in connections 18, the carriage 12 moves to the left in the representation illustrated in [Fig. 2], as indicated schematically by the arrow in [Fig. 2], so that the carriage 12 moves to the left in the embodiment shown in [Fig. 2]. The locking pawl 10 engages in a groove 9 of the drill string 5 and advances it. Then the idle stroke takes place, by means of the hydraulic plug-in connections 26 the piston annular space of the hydraulic cylinders 1 is subjected to pressure. This idle stroke takes place at high speed, in particular if the diameter of the piston rods 4 is selected to be large and therefore the piston ring surfaces are very small.During the idle stroke, the locking pawl 10 moves over a bevel 19 out of a groove 9 of the drill string 5, to, towards the end of an idle stroke, pivot again into another groove 9 of the drill string 5, to carry out another working stroke and thus the additional advancement. As soon as the drill head 6 reaches, for example, . a target excavation not shown, the drilling head 6 can be replaced by a tool, not shown, for the insertion of lines of all kinds.

[0051] For the traction drive of the drill string 5, the drive is brought to the configuration shown in [Fig.3].

[0052] In contrast to [Fig. 2], the hydraulic cylinders 1 have been rotated through 180° transversely to their longitudinal axes. For this purpose, the hydraulic cylinders 1 are lifted and the piston rods 4 are hooked by their grooves 13 in the front frame plate 20 and the cylinder tube 11 is hooked into the carriage 12. For the tensile working direction, the front frame plate 20 is then the fixed point for the return. The locking pawl 10 is folded back, so that it can act in a reverse direction. In the event of pressure loading of the pistons on the side of the hydraulic cylinders 1, the locking pawl 10 for its part engages in a groove of the drill string 5 and pushes it to the right in the illustrated representation, so that a line not shown can be inserted into the already produced pilot bore.

[0053] As already described in connection with [Fig. 2], the steps of the working stroke and the idle stroke are repeated, for example until the line to be inserted reaches the starting excavation 3. By means of the configuration, shown in [Fig. 3], of the earth drilling device 2, the working stroke is carried out with high force by pressure loading on the piston side and the idle stroke is carried out at high speed by pressure loading on the piston ring side.

Claims

Claims

1. Drive of a ground drilling device (2) for the insertion by pushing or pulling of a drill string (5) comprising a frame (25) and a carriage (12) which can be moved back and forth relative to the frame (25), at least one hydraulic cylinder (1) being arranged between the frame (25) and the carriage (12) for moving the carriage (12), characterized in that the hydraulic cylinder (1) can be arranged between the frame (25) and the carriage (12) detachably in two different working directions, in such a way that the hydraulic cylinder (1) can be rotated so that, after a rotation of said hydraulic cylinder (1) transversely to its longitudinal direction, respectively for the working movement in the case of pushing and for the working movement in the case of pulling, always one and the same side of the hydraulic cylinder (1) can be subjected to pressure.

2. Drive according to claim 1, characterized in that the hydraulic cylinder (1) can be connected in a form-fitting manner to the carriage (12) and / or the frame (25) in both different directions by inserting or inserting the hydraulic cylinder (1) into receptacles (7) on the carriage (12) and / or the frame (25).

3. Drive according to claim 1 or 2, characterized in that the hydraulic cylinder (1) comprises a piston rod (4) and a cylinder tube (11), the piston rod (4) and / or the cylinder tube (11) comprising an a) first engagement element or a b) receptacle for a second engagement element and the carriage (12) and / or the frame (25) comprising an a) receptacle for the first engagement element or the b) second engagement element.

4. Drive according to claim 3, characterized in that the first engagement element and / or the second engagement element is a groove (13, 15, 27) formed between two limiting surfaces, the groove (13, 15, 27), the housing and the limiting surfaces being adapted to each other in such a way that a form-fitting engagement in the direction longitudinal of the piston rod (4) and / or the cylinder tube (11) is obtained.

5. Drive according to one of claims 1 to 4, characterized in that the hydraulic cylinder (1) is a differential cylinder.

6. Drive according to one of claims 1 to 5, characterized in that two hydraulic cylinders (1) are provided, which are arranged symmetrically to each other with respect to the frame (25) and / or the carriage (12).

7. Drive according to one of claims 1 to 6, characterized in that a locking pawl (10) is rotatably arranged on the carriage (12).

8. Drive according to claim 3 or one of claims 4 to 7, insofar as they are dependent on claim 3, characterized in that an element of a plug-in or screw connection (18, 26) for connecting a hydraulic line is formed on the cylinder tube (11).

9. Method for operating a drive of a ground drilling device (2) for driving a drill string (5) into the ground (8) in the pushing or pulling working direction comprising a frame (25), a carriage (12) movable in a reciprocating motion relative to the frame (25), and at least one hydraulic cylinder (1) between the frame (25) and the carriage (12) for moving the carriage (12) relative to the frame (25), the hydraulic cylinder (1) being detached from the frame (25) and / or the carriage (12) and being rotated transversely to its longitudinal axis for reversing the working direction, the hydraulic cylinder (1) being rotated such that, after a rotation of said hydraulic cylinder (1) transversely to its longitudinal direction, respectively for the working movement in the pushing case and for the working movement in the pulling case,always one and the same side of the hydraulic cylinder (1) is subjected to pressure.,

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