Slurry wall grab having a hybrid drive

Abstract

The invention relates to a slurry wall grab having a hybrid drive comprising at least one pulley block, at least one hydraulic actuator, and at least one energy store, wherein the hydraulic actuator and the pulley block are configured to open and/or close a grab jaw of the slurry wall grab, and wherein the energy store can be charged by actuating the pulley block.

Claims

1. A slurry wall grab (1) having a hybrid drive, comprising at least one rope pulley (2), at least one hydraulic actuator (3), and at least one energy store (4), wherein the hydraulic actuator (3) and the pulley block (2) are configured to open and/or to close a grab jaw (5) of the slurry wall grab (1), and wherein the energy store (4) can be charged by actuating the pulley block (2).

2. A slurry wall grab (1) in accordance with claim 1, wherein the energy store (4) comprises at least one gas accumulator.

3. A slurry wall grab (1) in accordance with claim 1, wherein the pulley block (2) is configured to charge the energy store (4) by actuating the hydraulic actuator (3).

4. A slurry wall grab (1) in accordance with claim 1, wherein the pulley block (2) is configured to charge the energy store (4) on the opening and/or closing of the grab jaw (5).

5. A slurry wall grab (1) in accordance with claim 1, wherein at least one valve (6), in particular a remote-controllable valve, is provided to control the hydraulic actuator (3) and/or the energy store (4).

6. A slurry wall grab (1) in accordance with claim 5, wherein the valve (6) is controllable via radio and/or via a hoist rope comprising an electrical conductor.

7. A slurry wall grab (1) in accordance with claim 5, wherein the valve (6) is a proportional valve, in particular an electromagnetic proportional valve.

8. A slurry wall grab (1) in accordance with claim 1 wherein the slurry wall grab (1) comprises hydraulically adjustable guide elements (9).

9. A slurry wall grab (1) in accordance with claim 8, wherein the energy store (4) is configured to supply the guide elements (9) with energy.

10. A slurry wall grab in accordance with claim 1, wherein at least two hydraulic actuators are provided.

11. A slurry wall grab (1) in accordance with claim 2, wherein the pulley block (2) is configured to charge the energy store (4) by actuating the hydraulic actuator (3).

13. A slurry wall grab (1) in accordance with claim 11, wherein the pulley block (2) is configured to charge the energy store (4) on the opening and/or closing of the grab jaw (5).

14. A slurry wall grab (1) in accordance with claim 3, wherein the pulley block (2) is configured to charge the energy store (4) on the opening and/or closing of the grab jaw (5).

15. A slurry wall grab (1) in accordance with claim 2, wherein the pulley block (2) is configured to charge the energy store (4) on the opening and/or closing of the grab jaw (5).

16. A slurry wall grab (1) in accordance with claim 15, wherein at least one valve (6), in particular a remote-controllable valve, is provided to control the hydraulic actuator (3) and/or the energy store (4).

17. A slurry wall grab (1) in accordance with claim 14, wherein at least one valve (6), in particular a remote-controllable valve, is provided to control the hydraulic actuator (3) and/or the energy store (4).

18. A slurry wall grab (1) in accordance with claim 13, wherein at least one valve (6), in particular a remote-controllable valve, is provided to control the hydraulic actuator (3) and/or the energy store (4).

19. A slurry wall grab (1) in accordance with claim 12, wherein at least one valve (6), in particular a remote-controllable valve, is provided to control the hydraulic actuator (3) and/or the energy store (4).

20. A slurry wall grab (1) in accordance with claim 11, wherein at least one valve (6), in particular a remote-controllable valve, is provided to control the hydraulic actuator (3) and/or the energy store (4).

Description

[0019] Further details and advantages of the invention are explained with reference to the embodiment shown by way of example in the Figure.

[0020] The only Figure shows a side view of a slurry wall grab 1 in accordance with the invention having a hybrid drive. The hybrid drive comprises a pulley block 2 that is in particular arranged in parallel with at least one hydraulic actuator 3. The hydraulic actuator 3 can comprise at least one hydraulic cylinder or at least one hydraulic cylinder-piston apparatus.

[0021] In the embodiment of the Figure, the pulley block 2 is substantially encompassed by two hydraulic actuators 3. I.e. the pulley block can be arranged between the hydraulic actuators 3. The hydraulic actuators 3 can be arranged tangentially to the pulleys and/or spaced apart from the axes of rotation of the pulleys. At least one coupling section via which the hydraulic actuator 3 can be coupled to at least one of the pulleys can be provided for this purpose at at least one of the pulleys, arranged radially outwardly thereat.

[0022] A first pulley of the pulley block 2 is coupled via a linkage 51 to two halves of a grab jaw 5 in the embodiment of the Figure. This first pulley can be arranged further away from the grab jaws 5 than a second pulley of the pulley block. The first pulley can be configured as displaceable with respect to the remaining structure of the slurry wall grab 1, while the second pulley can be configured as not displaceable with respect to the remaining structure of the slurry wall grab 1, or vice versa. The linkage 51 can also be coupled to the second pulley instead of to the first.

[0023] The halves of the grab jaw 5 can be pivoted relative to one another by changing the spacing between the first pulley 5 and the second pulley of the pulley block. Provision can be made here that a decrease or an increase of the spacing closes the grab jaws 5.

[0024] The slurry wall grab 1 can furthermore comprise at least one energy store 4 that can be formed as a gas accumulator. The energy store 4 is coupled to the at least one hydraulic actuator 3. The hydraulic actuator 3 is configured, like the pulley block 2 itself, to change the spacing between the two pulleys of the pulley block 2.

[0025] The energy store 4 can be arranged in an outer region of the slurry wall grab 1 and/or in an upper region of the slurry wall grab 1. The energy store 4 can in particular be arranged within outer frame parts of the slurry wall grab 1.

[0026] When the grab jaw 5 is to be closed with an increased force to grab material, both the hydraulic actuator 3 and the pulley block 2 can be controlled to reduce the spacing of the two pulleys of the pulley block 2.

[0027] A valve can be correspondingly controlled for this purpose, for example, such that hydraulic fluid flows from the energy store 4 into the hydraulic actuator 3 and a rope of the pulley block 2 can be coiled over a winch, for example, such that the two pulleys are moved toward one another by the rope and by the hydraulic actuator 3.

[0028] The term of the grab jaw 5 can in the present case comprise the two jaw halves of the grab jaw 5 shown in the Figure.

[0029] To charge the energy store 4, the arrangement of the hydraulic actuator and of the energy store can be controlled via a valve such that the hydraulic actuator 3 is used for charging the energy store 4. The mechanical energy that is introduced via the rope into the pulley block 2 to adjust the pulleys of the pulley block 2 is here converted by means of the hydraulic actuator 3 into hydraulic energy in the energy store 4.

[0030] Alternatively or additionally, it is also conceivable that an energy converter different from the hydraulic actuator is provided by means of which the energy store 4 can be charged.

[0031] The valve 6 used here can be controllable for switching via radio and/or via a hoist rope comprising an electrical line. The control via a corresponding hoist rope brings along the advantage that the control is also possible within deep trenches and is not restricted by the range of a radio transmitter.

[0032] The slurry wall grab 1 can furthermore in particular comprise hydraulically adjustable and/or modular guide elements 9 that guide the slurry wall grab 1 within a trench dug by it. The guide elements 9 or their hydraulic drive or their hydraulic drives can be coupled with the energy store 4 of the slurry wall grab 1 to be supplied with energy by it.

[0033] Since the energy store 4 can be charged with hydraulic energy as described above, the invention provides the possibility of utilizing the energy stored in this manner for carrying out a hydraulic verticality correction by means of the guide elements 9. There is thus the possibility of providing a self-sufficient verticality correction that provides the same or similar advantages to the closing force amplification achievable in accordance with the invention.

[0034] The basic concept of the above-described hybrid grab is based on a mechanical slurry wall grab. The pulley block is assisted by hydraulic cylinders to increase its excavating force or to increase the weight force of the grab in the closing procedure with the same excavation force and thus to improve the excavation behavior in hard ground.

[0035] The energy for the hydraulic cylinders is converted from mechanical energy into hydraulic energy on the opening and closing procedure without resistance, e.g. outside the trench, and is buffered, for example in a gas accumulator. The system is thereby self-sufficient from the carrier system. The signals for the control of the electromagnetic proportional valves are transmitted via radio or via a special hoist rope including electrical conductors. The radio transmission may, however, only be possible outside the trench. The hydraulic energy can also be made use of for the adjustment of the hydraulic adjustment cylinders of the guide frames or of guide elements 9.