Percussion boring device

Abstract

A percussion boring device with an impact piston is mounted within a housing and driven in a cyclic back and forth movement. In a first switch position, the impact piston strikes a front impact surface, in order to drive the percussion boring device in a first movement direction, and, in a second switch position, the impact piston strikes a rear impact surface, in order to drive the percussion boring device in a second movement direction. For the reversal of the movement directions, a guide tube fixed to the housing, and a control sleeve which can be axially shifted on the guide tube, are provided, and the impact piston can be axially shifted on the control sleeve. The control sleeve includes two sections which are connected to one another by a movable connection.

Claims

1. A percussion boring device comprising: a housing; a guide tube fixed to the housing; a control sleeve axially displaceable on the guide tube, said control sleeve having at least a first sleeve section, a second sleeve section, and a movable connector movably connecting the first sleeve section and the second sleeve section; an impact piston mounted within the housing and axially displaceable on the control sleeve such that in a first switching position the impact piston strikes a front impact surface and drives the percussion boring device in a first movement direction, and, in a second switching position said impact piston strikes a rear impact surface and drives the percussion boring device in a second movement direction.

2. The percussion boring device of claim 1, wherein the first sleeve section comprises a head section of the control sleeve and the second sleeve section comprises a main body section of the control sleeve.

3. The percussion boring device of claim 1, wherein a first region of the first sleeve section has a different outer diameter than a second region of the second sleeve section.

4. The percussion boring device of claim 1, wherein the movable connector is configured to swivel the first sleeve section and the second sleeve section relative to one another on the guide tube.

5. The percussion boring device of claim 1, wherein the movable connector comprises one of a resilient connector and an articulating connector, and wherein the movable connector is at least partially in contact with the guide tube.

6. The percussion boring device of claim 5, wherein the movable connector comprises the resilient connector, and wherein the resilient connector comprises a deformable plastic.

7. The percussion boring device of claim 1, wherein the movable connector comprises an annular connector having an L-shaped cross section.

8. The percussion boring device of claim 1, wherein the guide tube comprises an abutment, and the control sleeve comprises a counter-element which is in contact with the abutment when the percussion boring device is in one of the first switching position and the second switching position.

9. The percussion boring device of claim 1, further comprising an annular element within the housing which forms an annular space between the guide tube and the annular element, wherein the annular space is at least partially covered by the control sleeve, and wherein the annular space is in fluid communication with a control line.

10. The percussion boring device of claim 1, wherein the first sleeve section comprises a head section of the control sleeve and includes a ventilation bore.

11. The percussion boring device of claim 1, wherein the movable connector includes a ventilation bore.

12. A percussion boring device comprising: a housing extending longitudinally from a front impact surface to a rear impact surface; a guide tube extending longitudinally within the housing, wherein the guide tube is fixed to the housing; a control sleeve longitudinally displaceable on the guide tube, said control sleeve having at least a first sleeve section, a second sleeve section, and a movable connector connecting the first sleeve section and the second sleeve section; an impact piston mounted within the housing and longitudinally displaceable on the control sleeve such that in a first switching position the impact piston strikes the front impact surface and drives the percussion boring device in a first movement direction, and, in a second switching position said impact piston strikes the rear impact surface and drives the percussion boring device in a second movement direction.

13. The percussion boring device of claim 12, wherein the movable connector indirectly connects the first sleeve section and the second sleeve section.

14. The percussion boring device of claim 12, wherein the first sleeve section comprises a head section of the control sleeve and the second sleeve section comprises a main body section of the control sleeve which is at least partially in contact with the guide tube.

15. The percussion boring device of claim 14, wherein the head section is movably attached to an end of the guide tube such that a portion of the head section extends longitudinally beyond the end of the guide tube; and wherein the head section has an outer diameter configured to correspond to an inner diameter of the impact piston such that the head section and the impact piston form guide surfaces relative to one another that facilitate longitudinal displacement of the impact piston relative to the control sleeve.

16. The percussion boring device of claim 14, wherein the main body section of the control sleeve has an inner diameter configured to correspond to an outer diameter of the guide tube to facilitate longitudinal displacement of the main body section of the control sleeve on the guide tube.

17. The percussion boring device of claim 14, wherein the movable connector is configured to swivel the head section of the control sleeve relative to the main body section of the control sleeve.

18. The percussion boring device of claim 14, wherein the guide tube comprises an abutment, and the head section of the control sleeve comprises a counter-element which is in contact with the abutment when the percussion boring device is in one of the first switching position and the second switching position.

19. The percussion boring device of claim 14, further comprising an annular element within the housing which has a fixed position relative to the guide tube, wherein the annular element is coaxial with the guide tube and forms an annular space between the guide tube and the annular element, wherein the main body section of the control sleeve abuts the annular space; and wherein the annular space is in fluid communication with a control line and is configured to be pressurized or depressurized with fluid from the control line, wherein pressurization or depressurization of the annular space causes the main body section of the control sleeve to be displaced on the guide tube.

20. The percussion boring device of claim 19, wherein one of the head section of the control sleeve and the movable connector includes a ventilation bore which reduces pressure buildup that impedes the displaceability of the control sleeve.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the drawings:

(2) FIG. 1 shows a percussion boring device in a partially cut representation;

(3) FIG. 2 shows the percussion boring device of FIG. 1 in an enlarged representation with extended control tube; and

(4) FIG. 3 shows the representation according to FIG. 2 with retracted control tube.

DETAILED DESCRIPTION

(5) FIG. 1 shows a percussion boring device 1 for boring in the ground. On the end side, on the percussion boring device 1, on the left in the representation of FIG. 1, a bore head with a boring cutter is provided. The percussion boring device 1 comprises an impact piston 2 mounted within a housing 3. The impact piston 2 can be driven for a cyclical back and forth movement in the housing 3. In a first switch position, the impact piston 2 strikes a front impact surface, in order to drive the percussion boring device 1 in a first movement direction (to the left in the embodiment represented in FIG. 1). In a second switch position, the switch piston 2 strikes a rear impact surface, in order to drive the impact boring device in a second movement direction (to the right in the embodiment represented in FIG. 1).

(6) For the reversal of the movement directions, the percussion boring device comprises a guide tube 5 fixed to the housing and a control sleeve 4 which can be axially shifted on the guide tube 5. The impact piston 2 can be axially shifted on the control sleeve 4. In particular from FIG. 2, one can see that the control sleeve 4 temporarily engages in the impact piston 2 during the axial shifting.

(7) The control sleeve 4 comprises two sections 7, 8 which are connected to one another by means of a movable connection and which are configured to form head section 7 and main body section 8. In the embodiment example represented in FIGS. 1 to 3, the movable connection 6 is configured to form a resilient connecting section which is configured in such a manner that the two sections of the control sleeve 4 can swivel relative to one another. The movable connection 6 is connected to the main body section 8, and the head section 7 grips the resilient connecting section.

(8) The main body section 8 of the control sleeve 4 is at least partially in contact with the guide tube 5. The head section 7 of the control sleeve 4 is formed on the inner side, spaced apart from the guide tube 5. The inner diameter of the head section 7 of the control sleeve 4, particularly at the end spaced apart from the main body section 8, is configured to be larger than the outer diameter of the guide tube 5. At the end of the head section 7, which is adjacent to the main body section 8, the head section 7 has a lower inner diameter than at the end of the head section 7, which is spaced apart from the main body section 8.

(9) Connected to the guide tube 5, there is an abutment ring 12 which comprises an abutment for the control sleeve 4. For this purpose, on the head section 7 of the control sleeve 4, a counter-element configured in accordance with the abutment is configured, which, in the switch position of the control sleeve 4 relative to the guide tube 5, represented in FIG. 2, is in contact with the abutment of the guide tube 5. The abutment ring 12 can form with the outer circumference an inner guide for the head section 7 of the control sleeve 4.

(10) In FIG. 2, an annular space 10 is represented, which is formed between the guide tube 5 and an annular element 9 which is arranged fixedly relative to the guide tube 5. The annular space 10 is delimited at least partially on the front side by the control sleeve 4 and connected to a control line 11 which can be pressurized with a fluid. By means of the control line 11, the annular space 10 can be pressurized, in order to extend the control sleeve 4 out of the annular space 10. If the pressurization of the annular space 10 is stopped, a retraction and/or a resetting of the control sleeve 4 is brought about by means of the operating pressure applied to the control sleeve 4.

(11) FIG. 3 shows, as an example for FIG. 2, a ventilation bore 13 which is formed in the head section 7 of the control sleeve 4, in order to establish a pressure compensation.