Abstract
A drive of a ground drilling device for pushing or pulling introduction of a drill string with a frame and a slide that can be moved back and forth relative to the frame, wherein there is at least one hydraulic cylinder between the frame and the slide for moving the slide, and wherein the hydraulic cylinder can be arranged in a removable manner in two different working directions between the frame and the slide.
Claims
1.-10. (canceled)
11. Drive of a ground drilling device for pushing or pulling insertion of a drill string with a frame and a movable slide movable back and forth relative to the frame, comprising: at least one hydraulic cylinder for moving the slide relative to the frame; wherein the at least one hydraulic cylinder is arranged in a removable manner in two different working directions between the frame and the slide.
12. Drive according to claim 11, wherein the at least one hydraulic cylinder is positively connected to the slide and/or the frame in the two different directions by inserting or installing the at least one hydraulic cylinder to holders on the slide and/or frame.
13. Drive according to claim 11, wherein the at least one hydraulic cylinder comprises a piston rod and a cylinder tube, the piston rod and/or the cylinder tube having a) a first engaging element or b) a holder for a second engaging element, and the slide and/or the frame having a) a holder for the first engaging element or b) the second engaging element.
14. Drive according to claim 13, wherein the first engaging element and/or the second engaging element is a groove formed between two delimiting surfaces, wherein the groove, the holder, and the delimiting surfaces are adapted in relation to one another such that a positive fit is achieved in the longitudinal direction of the piston rod and/or the cylinder tube.
15. Drive according to claim 11, wherein the at least one hydraulic cylinder is a differential cylinder.
16. Drive according to claim 11, wherein two hydraulic cylinders are provided and arranged symmetrically to one another with respect to the frame and/or slide.
17. Drive according to claim 11, further comprising a locking pawl arranged such that it is rotatable on the slide.
18. Drive according to one of claim 13, further comprising an element of a plug-in or screwed connection for connecting a hydraulic line on the cylinder tube.
19. A method for operating a drive of a ground drilling device for driving a drill string into the soil in the pushing or pulling working direction with a frame, a movable slide movable back and forth relative to the frame, and at least one hydraulic cylinder between the frame and slide for moving the slide relative to the frame, comprising: removing the at least one hydraulic cylinder from the frame and/or slide and rotating transverse to its longitudinal axis to reverse the working direction.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0035] The invention is clarified below with reference to the exemplary embodiment shown in the figures.
[0036] The figures show:
[0037] FIG. 1 a ground drilling device with a drill string and a drive in a partially sectioned side view;
[0038] FIG. 2 a drive in a first working direction of a ground drilling device in an isometric view;
[0039] FIG. 3 the drive of FIG. 2 in an isometric view with its working direction having been changed; and
[0040] FIG. 4 an enlarged view of a portion of the drive of FIGS. 2 and 3 from above.
DETAILED DESCRIPTION
[0041] FIG. 1 shows, in a partially sectioned side view, a ground drilling device 2 inserted in a launch pit 3. A drill string 5 with a ground drilling tool in the form of a drilling head 6 at the front can be introduced into the soil 8 by means of the ground drilling device 2. A transmitter holder 7 is arranged in the drill string 5 behind the drilling head 6.
[0042] The pushing or pulling introduction of the drill string 5 takes place by two hydraulic cylinders 1, which move a locking pawl 10 back and forth. The locking pawl 10 is attached to a slide 12. The locking pawl 10 is attached to the slide 12 such that it can be rotated for changing the working direction. The slide can move relative to a frame 25, which has a front frame plate 20 and a rear frame plate 14 on the ends, by means of actuation of the hydraulic cylinders 1. A fixed point for the removable fastening of the hydraulic cylinder 1 is provided on the frame 25 on the front frame plate 20 and on the rear frame plate 14.
[0043] To move the drill string 5, the locking pawl 10 in the position shown in FIGS. 1 and 2 slides out of a groove 9 of the drill string 5 during the retraction (idle stroke) and falls into another groove 9 when it is reached, so that the hydraulic cylinders 1 can advance the drill string 5 further in the working position as schematically shown in FIG. 2.
[0044] For a pulling working direction of the hydraulic cylinders, shown in FIG. 3, the hydraulic cylinders are rotated transverse to their longitudinal direction. It is possible that the cylinder or piston side of the hydraulic cylinder 1 with the greater force is (further) available for the working stroke, and the piston rod side is (always) available for a quick return stroke.
[0045] While FIG. 2 shows the arrangement of the hydraulic cylinders 1 in relation to the slide 12 and frame 25 for a pushing introduction of the drill string 5, FIG. 3 shows a pulling working direction, whereby in both FIG. 2 and FIG. 3, the position of the hydraulic cylinders 1 is shown in each case after completion of the working stroke (cylinder extended).
[0046] In FIG. 2, the two hydraulic cylinders 1 are hung with their piston rods 4 in grooves 13 of a rear frame plate 14. The piston rods in turn each have a recess, or groove 27, that is adapted to the thickness of the frame plates 14 and 20. The groove 13 in the frame plates 14, 20 is in turn adapted to the diameter of the piston rod 4 in the area of the groove 27. The frame plate 14 forms the fixed point for the advancement or the pushing working direction, as it can be used, for example, for a pilot borehole.
[0047] The cylinder tubes 11 of the hydraulic cylinders 1 are hooked on one side by a groove 15 and on the other by a stop 16 by projections 17 of the slide 12, as shown in FIG. 4, which shows an enlarged view of the drive of FIGS. 2 and 3 from above. A stop 16 for a projection 17 is provided on each cylinder tube 11. 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 the two working directions of the hydraulic cylinder 1. A handle is formed between the stops 16 for handling the cylinder tube 11 or the hydraulic cylinder 1, by means of which the hydraulic cylinder 1 can be lifted out of the slide 12 and out of the groove 13.
[0048] In FIGS. 2 to 4, guide tubes 50 are arranged on the frame 25 that extend parallel to the working direction of the ground drilling device 2 or the direction of movement of the slide 12. Extendable support elements, which are not shown, can be arranged in the guide tubes 50, by means of which the frame 25 can be supported in the excavation pit or the shaft.
[0049] If the piston sides of the hydraulic cylinders 1 are now subjected to pressure via the hydraulic plug-in couplings 18, the slide 12 moves to the left in the illustration shown in FIG. 2, as indicated schematically by the arrow in FIG. 2, so that the slide 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 pushes the drill string forward. The idle stroke then takes place in that the piston ring chamber of the hydraulic cylinder 1 is pressurized by means of the hydraulic plug-in couplings 26. This idle stroke takes place at high speed, in particular when the diameter of the piston rods 4 is selected to be large and the piston ring surfaces are therefore 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 tilt back into another groove 9 of the drill string 5 toward the end of an idle stroke in order to carry out another working stroke and thus realize further advancement. As soon as the drilling head 6 has arrived at, for example, a target pit (not shown), the drilling head 6 can be exchanged for a tool (not shown) for pulling in lines of all kinds.
[0050] For the pulling drive of the drill string 5, the drive is set up in the configuration shown in FIG. 3.
[0051] The hydraulic cylinders 1 have been rotated 180° transverse to their longitudinal axes compared to FIG. 2. For this purpose, the hydraulic cylinders 1 are lifted up, the piston rods 4 are set with their grooves 13 in the front frame plate 20, and the cylinder tube 11 is set in the slide 12. For the pulling working direction, the front frame plate 20 is now the fixed point for the retraction. The locking pawl 10 is turned over so it can be effective in the opposite direction. When the piston is pressurized by the hydraulic cylinder 1, the locking pawl 10 again engages in a groove in the drill string 5 and pushes it to the right in the illustration shown, whereby a pipe (not shown) can be drawn into the pilot borehole that has already been made.
[0052] As has already been described with regard to FIG. 2, the steps of the working stroke and the idle stroke are repeated until, for example, the pipe to be pulled in has reached the launch pit 3. By means of the configuration of the ground drilling device 2 shown in FIG. 3, the working stroke is carried out with high force by applying pressure to the piston side, and the idle stroke is carried out at high speed by applying pressure to the piston ring side.
