EP1950353B1 - Soil removal device - Google Patents

Abstract

The device has a base body connected to a carrier implement. Soil working tools are arranged on a work unit (20) that is supported on the base body. A rotary device is provided for rotating the work unit with respect to the base body about a rotation axis (34). The rotary device has a linear drive and a rope or chain transmission, through which a linear movement generated by the linear drive is translated into a rotating movement. A setting wheel (52) is arranged in a portion of a bearing device and coaxially to the axis of rotation.

Description

The invention relates to a soil removal device according to the preamble of claim 1. Such a soil removal device, in particular a diaphragm wall gripper, comprises a base body which can be connected to a carrier device, a work unit on which soil cultivation tools are arranged and which is rotatably mounted on the main body via a bearing device, and a twisting device for rotating the working unit with respect to the main body about a rotation axis.

Such devices are used to excavate recesses or trenches in the ground, which are needed primarily for the creation of founding or sealing elements in the ground. When using grippers with gripper blades there is the danger, especially when creating relatively deep diaphragm walls, that due to asymmetries, in particular an asymmetrical distribution of the gripper teeth on the gripper blades, an undesired deviation from the vertical can occur. To compensate for this, it is known to rotate the grapple bucket at regular intervals, in particular after each stroke, by 180 °. As a result, the deviations due to an asymmetrical tooth design can cancel each other out.

Generic Bodenabtragsvorrichtungen go for example from the DE-A-27 50 371 or the JP-A-7003835 out. Both devices have a twisting device, in which the rotation takes place by means of a setting wheel, which is frictionally wrapped by a rope.

Another generic Bodenabtragsgerät goes for example from the JP-A-55152228 out. The working unit with the gripper blades is mounted in this known device via a twisting device on a telescopic device. The rotation takes place via a rotary motor with drive pinion and an external gear, which is connected to the working unit. Since the twisting device is attached to the lower end of the telescopic device, the twisting device is moved along with the gripper blades in the trench or slot. In particular, with slots filled with support fluid, this can lead to impairments of the twisting motor and the sensitive transmission.

To avoid this problem, it is about from the EP 0 533 559 B1 known to arrange the twisting device at the upper end of the telescopic guide at the transition to the boom of the carrier device. However, the twisting device must rotate in this arrangement, the entire telescopic guide, which has not only a higher force but also a correspondingly more complex design of the rotary motor and the pivot bearing result. In addition, replacement of the telescope unit is made difficult, which is necessary, for example, if higher removal depths are desired.

In the EP 0 872 596 B1 a twisting device is proposed in which the twisting motor is fixedly mounted on the upper segment of the telescopic guide. At the working unit, a drive shaft is provided, which only comes via a coupling device with the twisting motor into engagement when the telescopic guide is fully retracted and the working unit with the gripper blades is completely moved out of the ground. To prevent rotation of the decoupled from the rotating motor unit a complex braking device is necessary.

The invention has for its object to provide a Bodenabtragsvorrichtung in which a working unit in a simple, robust construction with particularly good reliability is rotatable.

The object is achieved according to the invention by a Bodenabtragsvorrichtung with the features of claim 1. Preferred embodiments are given in the dependent claims.

In the soil removal device according to the invention, it is provided that the twisting device has at least one linear drive and a cable or chain transmission, by means of which a linear movement generated by the linear drive can be converted into a twisting movement.

A basic idea of the invention is not to produce the twisting movement by means of a twisting motor with a relatively complicated reduction gear, but rather by a simple, robust linear drive. For the implementation of the linear drive movement in a twisting a likewise simply constructed rope or chain transmission is provided. Such transmissions use a flexible element, such as a rope or a chain. For the purposes of the invention is a cable or chain transmission not to narrowly understand the use of a rope or a chain as a flexible element, but also includes straps, straps and other flexible elements. These can be translated by a simple wrap of a wheel, a linear motion in a twist. Such flexible, deflectable elements are reliable and low maintenance even in harsh environment and with great dirt. In addition, relatively high torques can be applied for a limited number of revolutions, which is fully sufficient for the use according to the invention.

As a linear drive fundamentally different drives, such as a rack drive or a ball screw drive are conceivable. However, according to the invention, it is particularly preferred for the linear drive to have an actuating cylinder, in particular a hydraulic cylinder, on the piston rod of which a flexible element of the transmission is mounted. Actuating cylinders, in particular hydraulic cylinders, are compact and can apply very high forces. In addition, Bodenabtragsgeräte usually already a hydraulic system with a variety of hydraulic cylinders. In particular, in the case of diaphragm wall grippers, hydraulic actuating cylinders are used, for example, for actuating the gripper blades. The inventive linear drive for the twisting device can be integrated into an existing system so easily.

The invention may be practiced with one or more actuator cylinders. In particular, the use of two single-acting actuating cylinders is conceivable, which are arranged opposite to each other and actuated. A particularly compact arrangement is achieved according to the invention in that the actuating cylinder is a double-acting actuating cylinder, protrudes from the cylinder housing on both sides of a piston rod, and that a flexible element of the transmission is attached to both ends of the piston rod. As a result, a defined rotation and reverse rotation can be achieved. In addition, a reliable tension of the flexible element (s) is ensured, since a tension is always generated during the advancing and retracting movement.

Further, it is provided according to the invention that the rope or chain transmission has an adjusting wheel on which at least one flexible element articulated and is at least partially wrapped by this. The articulation of the flexible element on the setting wheel is radially spaced from the axis of rotation. This distance represents the lever arm is, with which the linear tensile force of the flexible element is converted into a torque for rotating the working unit. The attachment of the rope on the thumbwheel can be achieved in a known manner by a non-positive and / or positive connection, such as by screws, clamps or otherwise. For this purpose, a retaining bolt is preferably provided on the adjusting wheel on which an end-side eye of the flexible. Element can be hung. According to the length of the linear movement, a rotation is effected depending on the effective circumference of the setting wheel.

A particularly robust and effective direct drive is achieved according to the invention in that the setting wheel is arranged in the region of the bearing device and coaxially with the axis of rotation. The thumbwheel is fixedly arranged on the base body, which is itself rotationally fixed relative to the carrier device. An applied tensile force on the flexible element thus causes an immediate rotation of the working unit relative to the setting wheel and the main body. Gearboxes to compensate for a misalignment are not necessary here.

In the inventive arrangement of the adjusting wheel on the base body, the linear drive is located on the working unit. The scope of the work unit provides sufficient space. Alternatively, in the reverse manner, the setting wheel can be arranged rotationally fixed on the working unit, while the linear drive is provided on the base body in order to effect a desired relative rotation between the working unit and the base body. A lifting device, that is about a telescopic or kelly linkage, can be arranged above or below the bearing device. The transmission of the tensile force on the thumbwheel can also be done by a partial or repeated wrapping of the rope exclusively by frictional force.

The axis of rotation of the twisting device is substantially parallel to the Abteufrichtung, which is usually the vertical. Certain deviations by a few degrees are possible for certain applications.

For a particularly reliable rotation, it is inventively that on the thumbwheel two flexible elements are articulated, through which in each case an opposite rotational movement is effected. The arrangement and wrapping of the flexible elements on the setting wheel is opposite, so that they each have a rotational movement in an opposite direction upon application of a tensile force produce. It can thus be ensured a reliable rotation and reverse rotation.

As already stated, the flexible element may be a chain, a band, a belt, etc., provided that this allows a linear movement and at the same time a deflection and wrapping. A particularly inexpensive, simple and reliable embodiment of the invention, however, is to be seen in that the flexible element is a steel cable. The use of steel cables is common in diaphragm wall devices, such as lifting or suspension cables. Steel cables are extremely robust even when used directly in a slot with support suspension and require virtually no maintenance.

A particularly reliable arrangement is achieved according to the invention in that connections for hydraulic fluid are provided on the bearing device. For the transfer of the hydraulic fluid through the rotating device from the carrier to the working unit, a known rotary feedthrough can be provided. Since usually only a rotation of the working unit is provided by 180 ° with subsequent reverse rotation, a flexible bridging of the hydraulic lines from the main body to the work unit can also be done via flexible hose lines.

Further, it is according to the invention that a carrier device is provided with a boom, on which a torsionally rigid lifting device is mounted, at the lower end of the work unit is arranged. The carrier device is usually a tracked vehicle with a superstructure on which a rope-operated mast or boom is articulated. The lifting device may be a single, vertically movable rod or carriage, a telescopic cylinder or a rope-operated Kelly linkage. Because of its compactness and robustness, the twisting device according to the invention can be arranged at virtually any point, for example between the boom and the lifting device or preferably between the lifting device and the working unit.

The Bodenabtragsgerät is preferably a diaphragm wall gripper, but not limited thereto. In principle, use can also be made in other trench wall devices, for example in trench wall milling with rotatably arranged cutting wheels, in particular if an uneven tooth arrangement is provided in the cutting wheels.

Fig. 1

eine Seitenansicht einer erfindungsgemäßen Bodenabtragsvorrichtung mit Trägergerät;

Fig. 2

eine weitere Ausführungsform einer erfindungsgemäßen Bodenabtragsvorrichtung mit Greiferschaufeln;

Fig. 3

eine Detailansicht zu Fig. 2 mit der Verdreheinrichtung;

Fig. 4

eine Seitenansicht der Bodenabtragsvorrichtung von Fig. 2;

Fig. 5

eine Ansicht der Bodenabtragsvorrichtung von Fig. 2 von oben; und

Fig. 6

eine teilgeschnittene Ansicht von oben der Bodenabtragsvorrichtung von Fig. 2

The invention will be further elucidated on the basis of preferred exemplary embodiments, which are illustrated schematically in the drawings. In the drawings show:

Fig. 1

a side view of a Bodenabtragsvorrichtung invention with carrier device;

Fig. 2

a further embodiment of a Bodenabtragsvorrichtung invention with gripper blades;

Fig. 3

a detailed view too Fig. 2 with the twisting device;

Fig. 4

a side view of the Bodenabtragsvorrichtung of Fig. 2 ;

Fig. 5

a view of Bodenabtragsvorrichtung of Fig. 2 from above; and

Fig. 6

a partially cutaway top view of the Bodenabtragsvorrichtung of Fig. 2

The basic structure of a Bodenabtragsvorrichtung 10 according to the invention for producing a slot 5 in the ground is in Fig. 1 shown schematically. On a carrier device 12 with an approximately vertically oriented mast 14 with mast head 16, a working unit 20 for lifting the slot 5 is arranged vertically displaceable over a lifting device 18 of a plurality of supporting cables.

According to Fig. 2 a Bodenabtragsvorrichtung 10 according to the invention is shown, which is designed as a slot wall gripper. The diaphragm wall gripper comprises a frame 24 with a central longitudinal member 60, on which side guide plates 64 are arranged in a known manner via transverse struts 62. At the lower end of the longitudinal member 60, two gripper blades 66 with teeth 68 are articulated pivotably as ground removal tools 22. The gripper blades 68 can be opened and closed via actuation rods 72 via a hydraulic actuating cylinder 70, which is arranged centrally on the longitudinal member 60, in order to remove and absorb soil material in a known manner. At the upper end of the longitudinal member 60, a bearing device 30 is arranged, with which the working unit 20 is mounted pivotably on the main body 32 by 180 °. The main body 32 has a holding device 31, with which the diaphragm wall gripper can be releasably attached to a lifting device for substantially vertical method.

For pivoting the working unit 20 relative to the base body 32, a turning device 40 is formed with a linear actuator 44 designed as a positioning cylinder and a cable transmission 50. The linear drive 44 has a cylinder housing 46, from whose two ends a respective piston rod 47 protrudes. The piston rods 47 are arranged along a longitudinal axis of the working unit 20 and movable to actuate a cable as a flexible element 45.

The cable gear 50 comprises a lower guide roller 54, two upper guide rollers 55 and a thumbwheel 52. While the thumbwheel 52 is rotatably mounted on the base body 32, the lower guide roller 54 and the upper guide rollers 55 are rotatably mounted on the frame 24 of the working unit 20. In the present embodiment, the flexible element 45 is formed by two separate ropes, which are each attached to one end with a piston rod 47 and the other end on the adjusting wheel 52 and this wrap around partially. By this arrangement, a closed active circuit is formed, so that when a counteracting operation of the piston rods 47, the flexible member 45 is always held under tension.

The storage and rotation of the working unit 20 will be described below with reference to FIG Fig. 3 described. On the main body 32, the bolt-shaped holding device 31 and underside a bearing pin 33 are fixedly attached on the upper side. For rotatable mounting a bearing bush 35, in particular a plain bearing, is arranged on the outside of the bearing journal 33, which is held on its outside by a receiving sleeve 63. The receiving sleeve 63 is fixedly connected via a holder 61 with the longitudinal member 60. About the bearing bush 35 so the receiving sleeve 63 and the entire working unit 20 is rotatably mounted relative to the base body 32.

The holder 61 has a free space into which the free end of the journal 33 protrudes. On the bearing pin 33, the adjusting wheel 52 is attached, which has two grooves for receiving a cable as a flexible element 45 on its outer circumference. By means of the two upper guide rollers 55, which are each rotatably supported by a bearing block 56 on the holder 61 of the working unit 20, the vertically and parallel to the axis of rotation 34 extending flexible element 45 in a horizontal Direction to the setting wheel 52 to be deflected, so that the ropes in the respective grooves of the setting wheel 52 open. The adjusting wheel 52 is arranged coaxially to the axis of rotation 34, which coincides with a longitudinal axis of the working unit 20.

At the lower end of the bearing journal 33, a connection piece with connections 36 for hydraulic fluid is arranged. Via hydraulic lines 26 on the main body 32, which lead to a carrier-device-side hydraulic supply, hydraulic fluid can be transferred through the interior of the bearing pin 33 via the connections 36 by means of flexible hose lines 37 to firmly attached connecting piece 38 on the rotatable working unit 20. The hydraulic supply is used in particular for supplying the actuating cylinder for the gripper blades and for the linear drive of the turning device.

According to the side view of Fig. 4 the lower guide roller 54 is rotatably mounted on the longitudinal member 60 of the processing device 10 via a lower bearing block 57. The parallel to the vertical and longitudinal axis of the device arranged linear actuator 44 has a cylinder housing 46 which is fixed to the longitudinal member 60.

According to Fig. 4 is the lower piston rod 47 retracted, while the upper piston rod 47 is extended opposite, so that the flexible member 45 is always held under tension. For tension adjustment, a tensioning device 48 is arranged along a free section of the flexible element 45.

The mechanism of twisting goes in particular from the FIGS. 5 and 6 out. A first flexible element 45a, which is a cable with an end-side eyelet, is deflected towards the setting wheel 52 via the first upper deflection roller 55a. By means of the eyelet, the first flexible element 45a is articulated to a first retaining bolt 58 of the adjusting wheel 52 in order to effect a relative rotation between the adjusting wheel 52 and the working unit 20 in the counterclockwise direction around the axis of rotation 34. The first flexible element 45a is with its other free end with the lower piston rod 47 of the linear actuator 44 according to Fig. 4 connected.

The second flexible element 45b is connected on the one hand via an eyelet to a second retaining pin 59 of the adjusting wheel 52 and on the other hand with the upper piston rod 47 of the linear drive 44. When the upper piston rod 47 is retracted, the second flexible member 45b correspondingly becomes the second upper deflecting roller 55b also retracted, with a relative rotation between the adjusting wheel 52 and the working unit 20 takes place about the axis of rotation 34. With this twisting movement, the first flexible element 45a is again wound around the adjusting wheel 52 in the clockwise direction at the same time, so that a later reverse rotation in the counterclockwise direction is again made possible with the first flexible element 45a by approximately 180 °.

Claims (8)

1. Soil stripping device, in particular trench wall grab, comprising

   - a base body (32) which can be connected to a carrier implement (12),

   - a work unit (20) on which soil working tools (22) are arranged and which is supported on the base body (32) in a rotatable manner by means of a bearing device (30), and

   - a rotary device (40) for rotating the work unit (20) with respect to the base body (32) about an axis of rotation (34),

   - the rotary device (40) having at least a linear drive (44) and a rope or chain transmission (50), through which a linear movement generated by the linear drive (44) can be translated into a rotating movement, and

   - the rope or chain transmission (50) having a setting wheel (52), around which at least one flexible element (45) is wound at least Partially,

   characterized in that

   - two flexible elements (45) are provided, which are attached to the setting wheel (52), and

   - the two flexible elements (45) have windings in opposite directions at the setting wheel (52), wherein through the flexible elements (45) an opposed rotating movement can be affected respectively when a tensile force is applied.
2. Soil stripping device according to claim 1,
   characterized in that
   the linear drive (44) has a setting cylinder, in particular a hydraulic cylinder, on the piston rod (47) of which a flexible element (45) of the transmission (50) is attached.
3. Soil stripping device according to claim 2,
   characterized in that
   the setting cylinder is a double-acting setting cylinder, from the cylinder housing (46) of which the piston rod (47) protrudes on both sides, and
   in that a flexible element (45) of the transmission (50) is attached to both ends of the piston rod (47).
4. Soil stripping device according to any one of claims 1 to 3,
   characterized in that
   the setting wheel (52) is arranged in the portion of the bearing device (30) and coaxially to the axis of rotation (34).
5. Soil stripping device according to any one of claims 1 to 4,
   characterized in that
   the linear drive (44) is arranged on the work unit (20) and
   in that the setting wheel (52) is arranged in a fixed manner on the base body (32).
6. Soil stripping device according to any one of claims 1 to 5,
   characterized in that
   each flexible element (45) is a steel rope.
7. Soil stripping device according to any one of claims 1 to 6,
   characterized in that
   on the bearing device (30) connections (36) for hydraulic fluids are provided.
8. Carrier implement having a mast, on which a lifting device is attached, at the lower end of which a soil stripping device according to any one of claims 1 to 7 is arranged.

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