Diaphragm wall milling machine with an adjustable cutting tool

Abstract

The invention relates to a trench cutter with at least one bearing plate and at least one milling wheel rotatably mounted on the bearing plate, the milling wheel having at least one adjustable cutting tool for crushing soil material, wherein the adjustable cutting tool is designed to move between a folded-in position and an extended position when the milling wheel rotates, wherein a wear plate is mounted on an outer side of the bearing plate, against which the adjustable cutting tool moves in the folded-in position. According to the invention, the wear plate comprises at least one first opening for receiving a connecting element, wherein the wear plate has a local reinforcement at the first opening and at least one recess is formed on the outer side of the bearing plate in which the local reinforcement is received.The invention further relates to a carrier device, in particular a cable excavator or a special foundation engineering device, with a diaphragm wall cutter according to the invention.

Description

[0001] The present invention relates to a slot wall milling machine according to the preamble of claim 1 and to a carrier device with such a machine.

[0002] Diaphragm wall cutters are used to create trenches for the construction of diaphragm walls in a wide variety of construction projects and are available in various designs and sizes. They are typically mounted on mobile carriers such as mobile cranes, specialist foundation equipment, or cable excavators and feature multiple cutter wheels with cutting tools to remove soil material to create a trench. The cutter wheels are typically rotatably mounted on one or more bearing plates, which are located on the underside of a cutter frame. A common configuration includes two pairs of cutter wheels, each pair mounted on its own bearing plate, with one cutter wheel on each side of the plate. The cutter wheels are typically mounted on cutter wheel bearings on the bearing plate, which can be driven to rotate them.

[0003] With diaphragm wall cutters of this type, where the milling wheels are arranged laterally on a bearing plate, the problem arises that soil material below and to the side of the bearing plate cannot be directly removed by the milling wheels. The removal of this material protrusion between the milling wheels, or to the side and below the bearing plate, can be achieved in known diaphragm wall cutters by using adjustable cutting tools or folding teeth. These tools move between a folded-in position, in which they do not collide with the bearing plate, and an extended position, in which they protrude into the area of ​​the material protrusion to be removed to the side / below the bearing plate.

[0004] The adjustable cutting tool is guided and moved between the folded and unfolded positions by a cam-type guide via a control bar located on the bearing shield. In known devices, this control bar is situated below and, if necessary, to the side of the milling wheel bearing and, during rotation, forces the adjustable cutting tool into the unfolded position. For the transition to the folded position, either a spring element is provided, which presses the adjustable cutting tool into the folded position in the upper area of ​​the bearing shield, or the transition occurs via contact with a usually chamfered transition surface of the bearing shield.

[0005] In the area of ​​the bearing shield, past which the adjustable cutting tool moves in the folded position, a wear plate is usually fitted to protect the bearing shield. The wear plate is typically bolted to the bearing shield. It must be thick enough so that the bolt heads can be countersunk, preventing them from protruding beyond the side of the wear plate facing the milling wheel. This necessitates greater plate thickness, which increases the overall width of the bearing shield, to which wear plates are typically attached on both sides. This results in a larger area below and to the side of the bearing shield from which excess material must be removed using the adjustable cutting tools.This can be achieved by allowing a correspondingly large swivel angle and / or a greater length of the adjustable cutting tools, which, however, leads to a higher load on the adjustable cutting tools.

[0006] The present invention is based on the objective of reducing the load on the adjustable cutting tool in a slot wall milling machine of the generic type and improving the effectiveness of removing excess material from the area of ​​the bearing shield.

[0007] According to the invention, this problem is solved by a slot wall milling machine with the features of claim 1. Advantageous embodiments of the invention are described in the dependent claims and the following description.

[0008] Accordingly, a trench cutter is proposed which comprises at least one bearing plate and at least one milling wheel rotatably mounted on the bearing plate. The milling wheel has at least one adjustable cutting tool for crushing soil material. In addition, the milling wheel preferably has a plurality of fixed cutting tools distributed around its outer circumference, i.e., tools that are immovable relative to the milling wheel. The term "cutting tool" is not to be understood restrictively here and does not require actual cutting or the presence of a cutting blade. Rather, it can refer to any element that can be used for crushing or milling soil material, for example, a milling tooth with a conical tip.

[0009] The adjustable cutting tool is designed to move between a folded and an extended position when the milling wheel rotates. For this purpose, a control bar may be arranged on the bearing shield, with which the adjustable cutting tool mechanically interacts during rotation of the milling wheel in such a way that the adjustable cutting tool automatically moves between the folded and extended positions depending on the milling wheel's rotation angle. In the extended position, the adjustable cutting tool projects into an area radially adjacent to the bearing shield, allowing any excess material to be removed. In the folded position, the adjustable cutting tool can move past the bearing shield without collision.

[0010] To protect against damage, a wear plate is mounted, specifically screwed, to one side of the bearing shield. The adjustable cutting tool moves past this plate when in the folded position. If the wear plate becomes worn, it can be easily replaced.

[0011] According to the invention, the wear plate comprises at least one first opening for receiving a fastener, in particular a screw, wherein the wear plate has a local reinforcement at the first opening. Local reinforcement means that the thickness or height of the wear plate is increased in this area compared to other areas, but the spatial area of ​​the reinforcement is limited to the area of ​​the first opening. At least one recess is formed on the outer surface of the bearing shield in which the local reinforcement is received. The recess preferably has a shape complementary to the local reinforcement, for example, a circular shape.

[0012] Because the local reinforcement is incorporated into a corresponding recess in the bearing shield, the head of the fastener, for example a screw head, can be countersunk in the wear plate at the opening without the entire wear plate needing to be correspondingly thick. The fastener is specifically countersunk in the area of ​​the local reinforcement, which in turn is recessed in the bearing shield.

[0013] This design makes it possible to reduce the overall thickness of the wear plate, for example to less than 10 mm or even less than 6 mm, without compromising the stability of the connection to the bearing shield. The necessary stability at the connection points and the required thickness for countersinking the fastener are provided spatially limited at the local reinforcements.

[0014] The reduced thickness of the wear plate results in a narrower overall width of the bearing shield. The resulting advantage is that the width of the area to be cleared of excess material radially adjacent to the bearing shield is also reduced, allowing the use of an adjustable cutting tool with a smaller folding angle and / or shorter length. This reduces the loads and wear on the adjustable cutting tool and improves its kinematics. Simultaneously, a thinner wear plate can be manufactured more cost-effectively. Furthermore, by reducing the area on the bearing shield that needs to be cleared due to its narrower overall width, wider milling wheels can be used, thus increasing the working range of fixed cutting tools.

[0015] In one possible embodiment, the local reinforcement forms a recess or receptacle in which a head portion of the fastener is countersunk. The head portion can, in particular, be a screw head. Preferably, the head portion is completely countersunk in the receptacle so that it does not protrude beyond the wear plate on the side facing the milling wheel (front side). The receptacle formed by the local reinforcement can have a bottom surface running parallel to the wear plate, in which the first opening is formed. The depth of the receptacle is adapted to the thickness of the head portion.

[0016] The local reinforcement is preferably designed as a doubling and is therefore preferably formed from the sheet metal of the wear plate itself.

[0017] In another possible embodiment, the head of the connecting element is located at least partially within the recess of the bearing shield. The recess in the bearing shield is designed to be particularly deep, allowing the receptacle formed by the local reinforcement to be countersunk to such an extent that the wear plate lies flat against the outside of the bearing shield and the head is completely recessed within the wear plate.

[0018] In another possible embodiment, the fastener is a screw with a screw head. The latter is preferably completely countersunk in the wear plate. The wear plate can thus be quickly and easily screwed to the bearing shield and / or a second wear plate located on the opposite side, simplifying replacement.

[0019] In another possible embodiment, the first opening and the local reinforcement are circular and, in particular, arranged coaxially. The recess in the bearing shield is also preferably circular.

[0020] In another possible embodiment, a bore is formed in the recess, in which the fastener is received and thereby holds the wear plate to the bearing shield. The bore can have an internal thread so that a fastener designed as a screw can be screwed into it. In this case, the wear plate is screwed directly to the bearing shield. Alternatively, the bore can be without an internal thread. In this case, preferably on the opposite side of the bearing shield, there is a second wear plate with a corresponding thread, to which the fastener designed as a screw is screwed. This forms a through-bolt connection with a long clamping length, via which the wear plates are screwed together and thus held to the bearing shield.

[0021] In another possible embodiment, it is provided that a milling wheel with at least one adjustable cutting tool and a wear plate are arranged on opposite sides of the bearing shield, wherein the slot wall milling machine preferably has two bearing shields, each with a pair of milling wheels.

[0022] In another possible embodiment, the connecting element extends from one wear plate through the bearing shield to the other wear plate, connecting the two wear plates to each other and to the bearing shield. As described above, the connecting element is preferably designed as a screw with a screw head, the screw head being countersunk in a first opening on one of the wear plates. The opposite end of the screw is preferably screwed into a second opening on the other wear plate, which includes a threaded bore.

[0023] In another possible embodiment, the wear plate includes at least a second opening with a threaded bore into which a connecting element designed as a screw can be screwed from the other side of the bearing shield via a bore running through the bearing shield.

[0024] Each of the wear plates can comprise at least one first opening in which a screw head is countersunk and at least one second opening in which a screw, brought from the other wear plate through the bearing shield, is screwed in.

[0025] The wear plate can also have a local reinforcement at the second opening, which is accommodated in a corresponding recess in the bearing shield. The previous descriptions of possible embodiments of the local reinforcement apply accordingly. The local reinforcement at the second opening can form a recess or receptacle, with a threaded bore on one of the receptacle's base surfaces. This prevents the screwed-in end of the screw from protruding beyond the wear plate. Alternatively, the local reinforcement can form a threaded body that is connected to the wear plate on the rear side. In this case, the threaded bore on the rear side, which allows the screw inserted from the other wear plate to be inserted, does not need to extend to the front of the wear plate.

[0026] Alternatively, the wear plate at the second opening may lack local reinforcement. In this case, the second opening may be a threaded bore formed directly in the flat wear plate, with the area around the second opening covering the recess of the bearing shield.

[0027] In another possible embodiment, the wear plate comprises a plurality of first and second openings, resulting in a stable attachment to the bearing shield. Preferably, the first and second openings are arranged symmetrically on the wear plate with respect to a central plane running through the bearing shield and the milling wheel axis. In other words, the first openings can preferably be mirrored across the imaginary central plane to create the second openings, and vice versa. This allows the same wear plate to be used on each side of the bearing shield. Different wear plates are not required, which reduces manufacturing costs.

[0028] Alternatively, two different wear plates can of course be used, whereby, for example, a first wear plate only has first openings for countersinking the screw heads and a second wear plate only has second openings.

[0029] In another possible embodiment, the wear plate has the shape of an arc with preferably two straight and two arcuate edges and preferably partially surrounds a milling wheel bearing. This shape allows for optimal positioning of the wear plate directly above the milling wheel bearing and a control strip that preferably runs around the milling wheel bearing. However, the wear plate can, of course, also have any other shape, for example, a rectangular or irregular shape.

[0030] In another possible embodiment, a control bar is arranged on the bearing shield. When the milling wheel rotates, the adjustable cutting tool interacts mechanically with this control bar in such a way that it automatically moves between the folded and unfolded positions depending on the milling wheel's rotation angle. The control bar thus functions as a cam bar for the adjustable cutting tool, implementing a mechanical cam control system.

[0031] In a preferred embodiment, the control strip can be ring-shaped and thus rotate a full 360° around the milling wheel bearing. This places the first section of the control strip, responsible for the folding position of the adjustable cutting tool, above the milling wheel bearing and, in particular, between the milling wheel bearing and the wear plate. This results in improved, more defined guidance of the adjustable cutting tool in the folded position with a reduced folding angle, which reduces the load on the adjustable cutting tool and thus its wear.

[0032] InIn another possible embodiment, the adjustable cutting tool is not spring-mounted, and the adjustable cutting tool and the control bar are arranged and designed such that the movement from the folded-in position to the unfolded position occurs via contact with the control bar, and the movement from the unfolded position to the folded-in position occurs via contact with the control bar and / or a transition surface of the bearing shield, preferably chamfered relative to the milling wheel plane. This transition surface can be located at a rear end face of the bearing shield, viewed in the direction of rotation of the milling wheel.

[0033] In another possible embodiment, the adjustable cutting tool is designed such that, in the folded-in position, it has an axial distance to the wear plate and can be moved past it, and in the unfolded position, it projects into an area radially adjacent to the bearing shield.

[0034] In another possible embodiment, the adjustable cutting tool is pivotably mounted on the milling wheel, with the pivot axis of the adjustable cutting tool preferably being perpendicular to the axis of rotation of the milling wheel. This allows the adjustable cutting tool to fold away from or towards the bearing plate or wear plate during the transition between the folded and unfolded positions. The pivot axis is preferably provided by a joint, via which a pivotable part of the cutting tool is pivotably mounted on a base part that is rigidly connected to the milling wheel.

[0035] The invention further relates to a carrier vehicle with a diaphragm wall cutter according to the invention. This results in the same properties and advantages as for the diaphragm wall cutter according to the invention. The carrier vehicle can be, in particular, a cable excavator, but also a mobile crane, a special foundation engineering machine with a mast, or a hydraulic excavator. The carrier vehicle preferably comprises a mobile undercarriage, for example with crawler tracks, and a superstructure rotatably mounted on the undercarriage about a vertical axis, with a swiveling boom or an adjustable mast. The diaphragm wall cutter is, in particular, suspended from the carrier vehicle by a cable, which is guided via at least one pulley on the boom or mast to a winch on the superstructure.

[0036] Further features, details and advantages of the invention will become apparent from the exemplary embodiments explained below with reference to the figures. The figures show: Figure 1: An embodiment of the diaphragm wall cutter according to the invention in a perspective view; Figure 2: An embodiment of the bearing plate of the diaphragm wall cutter according to the invention without a wear plate in a perspective view; Figure 3: The bearing plate according to Fig. 2 with wear plate; Fig. 4: a section through the bearing shield in the area of ​​two bores; Fig. 5: an embodiment of the wear plate; Fig. 6: a detail of the back of the wear plate; and Fig. 7: an enlarged view of the bores made of Fig. 4 .

[0037] In the Figure 1Figure 1 shows an embodiment of the diaphragm wall cutter 10 according to the invention in a perspective view. The diaphragm wall cutter 10 shown in this embodiment comprises a milling frame 11, at the lower end of which several milling wheels 14 are arranged. The milling frame 11 can comprise three frame parts, which can be detachably connected to one another. Alternatively, the milling frame 11 can comprise a larger or smaller number of frame parts or be formed in one piece. The diaphragm wall cutter 10 can be suspended from the top of the milling frame 11 on a support device (not shown).

[0038] At the lower end of the milling frame 11 are two pairs, each with two coaxially arranged or axially spaced milling wheels 14, for removing and crushing soil material. The milling wheel pairs are arranged radially next to each other. The milling wheels 14 are rotatably mounted on gear shields or bearing shields 12, which are attached to the underside of the milling frame 11. The milling wheels 14 of each milling wheel pair are located on opposite sides of a common bearing shield 12.

[0039] Several cutting tools are arranged on the outer circumferential surfaces of the milling wheels 14, serving to remove and crush soil material. These cutting tools can also be referred to as crushing tools and can each comprise a base body with a recess and a replaceable milling tooth mounted therein. In the embodiments shown in the figures, the base bodies and the milling teeth have a flat shape, although other geometries (e.g., conical cutting tools or milling teeth) are also conceivable.

[0040] The cutting tools must be moved past the bearing shield 12 during rotation of the respective milling wheel 14 without collision. To enable the removal of soil material between the milling wheels 14, in an area adjacent to the narrow sides of the bearing shield 12, the outer cutting tools 18, which pass directly by the bearing shield 12, are not fixed (i.e., immovably) on the milling wheel 14, but are adjustable. The adjustable cutting tool 18 can preferably pivot about a pivot axis formed by a joint between a folded-in position and an extended position and is therefore also referred to as a hinged tooth. In the folded-in position, the adjustable cutting tool 18 is pivoted away from the bearing shield 12 so that it can move past it without collision. In the extended position, the adjustable cutting tool 18 is pivoted outwards towards the bearing shield 12.unfolded so that the milling tooth extends into the area next to or below the bearing shield 12 and can remove the soil material present there.

[0041] The Figure 2 Figure 1 schematically shows a perspective view of a bearing plate 12 without a milling wheel. It can be seen that the bearing plate 12 carries a rotatably driven milling wheel bearing 13 on each side, on which a milling wheel 14 can be mounted. The bearing plate 12 can have a corresponding gearbox and / or a corresponding rotary drive for driving the milling wheel bearing 13.

[0042] The bearing shield 12 has a wear plate 30 on each of its outer surfaces 20 facing the milling wheels 14 to protect the bearing shield 12 from damage. The wear plate 30 is arranged above the milling wheel bearing 13, so that the adjustable cutting tool 18 moves past the wear plate 30 in the folded position.

[0043] In the Figure 2Is the warehouse sign 12 without and in the Figure 3 with the wear plate 30 mounted. An embodiment of the wear plate 30 is shown in the Figure 5 The front side facing the milling wheel 14, i.e., the side facing away from the outer surface 20 of the bearing shield 12, is shown. As can be seen, the wear plate 30 can have an overall arc-shaped form to adapt to the round shape of the milling wheel bearing 13 and thus the path of movement of the adjustable cutting tool 18. Alternative shapes are also conceivable.

[0044] The wear plate 30 is attached to the bearing shield 12 by several fasteners, the fasteners being designed as screws 40 with a screw head 42. The screw head 42 is countersunk in the wear plate 30 so that it does not protrude beyond its front surface and collide with the adjustable cutting tool 18.

[0045] The wear plate 30 according to the invention is designed to be particularly thin and can, for example, have a thickness of approximately 5 mm. The fact that the screw heads 42 can nevertheless be completely countersunk is made possible by a special design of the wear plate 30 and the fastening points on the outside 20 of the bearing shield 12.

[0046] The wear plate 30 has several first openings 32 through which the screws 40 pass. In the area of ​​the first openings 32, the wear plate 30 has local reinforcements 34, each of which forms a recess or receptacle for the screw head 42 of the corresponding screw 40. An embodiment of the local reinforcements 34 at the first openings 32 is shown in the Figure 6Figure 3 shows a section of the back of the wear plate 30 in the area of ​​the first openings 32. The local reinforcements 34 are designed as doublings, so that their walls have the same sheet thickness as the rest of the wear plate 30.

[0047] The bearing shield 12 has 20 recesses 22 at the corresponding positions on its outer side, in which the local reinforcements 34 are received or recessed (see Fig. 2 The recesses 22 can be arranged circularly and concentrically around the bores provided in the bearing shield 12. In the illustrated embodiment, these bores extend completely through the bearing shield 12 to the opposite outer surface 20 and also open into recesses 22. The screws 40 are screwed to the wear plate 30 located on the opposite side.

[0048] Preferably, each wear plate 30 has several first openings 32 in which the screw heads 42 are countersunk, and several second openings 33 with internal threads into which screws 40, inserted from the opposite wear plate 30, are screwed. In this embodiment, the opposing wear plates 30 are therefore not directly screwed to the bearing shield 12, but to each other, with the screws 40 being supported in the bores in the bearing shield 12. Such a through-bolt connection allows for a large clamping length.

[0049] The Figure 4 shows a section through the bearing shield 12 along two bores, with an enlargement of the bores in the Figure 7The first openings 32 are located here in the right wear plate 30, and the countersunk screw heads 42 can be seen in them. The screws 40 extend through the bearing shield 12 and into the second openings 33 on the other side (in the Fig. 7 The wear plate 30 is screwed in (on the left). In this embodiment, the bores in the bearing plate 12 open into recesses 22 on both sides.

[0050] Alternatively, the bores leading to the second openings 33 could have no recesses 22, and the second openings 33 could have no local reinforcements 34. Preferably, however, local reinforcements 34 are also provided at the second openings 33, which are recessed in corresponding recesses 22.

[0051] This combination enables optimal fastening of the thin wear plates 30, which increases both material efficiency and durability.

[0052] In the exemplary embodiment of the Figure 5 The first and second openings 32, 33 are arranged symmetrically with respect to an imaginary vertical center line or center plane, such that the first openings 32 can be mirrored onto the second openings 33 and vice versa. This allows the wear plate 30 to be used on both sides of the bearing shield 12. The screws 40 are always inserted from the side where the first opening 32 is located in a given screw position, so that the screw head 42 can be countersunk. On the opposite side, there is always a corresponding second opening 33 with an internal thread for making the screw connection. Alternatively to the one described in Fig. 5 In the embodiment shown, a different arrangement and / or number of first and second openings 32, 33 may be provided.

[0053] It is also conceivable that each wear plate has only initial openings 32 and that the screws 40 are screwed directly into threaded holes of the bearing plate 12.

[0054] To move the adjustable cutting tool 18 from the folded-in position to the unfolded position during a rotation of the milling wheel 14, a control strip (not shown) is preferably attached laterally to the bearing shield 12. This control strip acts as a cam strip and forces the adjustable cutting tool 18 into different pivot positions at specific angles of rotation when the milling wheel 14 is turned. The control strips on both sides can be mounted directly below the wear plates 30. Reference symbol list:

[0055] 10 Slot wall cutter 11 Milling frame 12 Bearing plate 13 Milling wheel bearing 14 Milling wheel 18 Adjustable cutting tool 20 Outer side of bearing plate 22 Countersink 30 Wear plate 32 First opening 33 Second opening 34 Local reinforcement 40 Screw 42 Screw head

Claims

1. Diaphragm wall cutter (10) with at least one bearing plate (12) and at least one milling wheel (14) rotatably mounted on the bearing plate (12), which has at least one adjustable cutting tool (18) for crushing soil material, wherein the adjustable cutting tool (18) is designed to move between a folded-in position and an extended position when the milling wheel (14) is rotated, wherein a wear plate (30) is mounted on an outer side (20) of the bearing plate (12), against which the adjustable cutting tool (18) moves in the folded-in position, characterized by that the wear plate (30) comprises at least one first opening (32) for receiving a connecting means, wherein the wear plate (30) has a local reinforcement (34) at the first opening (32) and at least one recess (22) is formed in the outside (20) of the bearing shield (12) in which the local reinforcement (34) is received.

2. Diaphragm wall cutter (10) according to claim 1, wherein the local reinforcement (34) forms a receptacle in which a head part of the connecting means is recessed, in particular completely recessed, wherein the local reinforcement (34) is preferably designed as a doubling.

3. Diaphragm wall cutter (10) according to claim 2, wherein the head part of the connecting means is located at least partially within the recess (22) of the bearing shield (12).

4. Slot wall cutter (10) according to one of the preceding claims, wherein the connecting means is a screw (40) which has a screw head (42) which is in particular completely countersunk in the wear plate (30).

5. Diaphragm wall cutter (10) according to one of the preceding claims, wherein the first opening (32) and the local reinforcement (34) are circular and in particular arranged coaxially.

6. Diaphragm wall cutter (10) according to one of the preceding claims, wherein a bore is formed in the recess (22) in which the connecting means is received and thereby holds the wear plate (30) on the bearing plate (12).

7. Slurry wall cutter (10) according to one of the preceding claims, wherein a milling wheel (14) with at least one adjustable cutting tool (18) and a wear plate (30) are arranged on opposite sides of the bearing plate (12), wherein the slurry wall cutter (10) preferably has two bearing plates (12) each with a pair of milling wheels (14).

8. Slot wall cutter (10) according to the preceding claim, wherein the connecting means extends from one wear plate (30) through the bearing shield (12) to the other wear plate (30) and connects the two wear plates (30) to each other and to the bearing shield (12), wherein preferably the connecting means is designed as a screw (40) with a screw head (42) and the screw head (42) is countersunk in a first opening (32) on one of the wear plates (30), while in particular the opposite end of the screw (40) is screwed into a second opening (33) of the other wear plate (30), which comprises a threaded bore.

9. Slit wall milling machine (10) according to one of the preceding claims, wherein the wear plate (30) comprises at least a second opening (33) with a threaded bore into which a connecting element designed as a screw (40) can be screwed from the other side of the bearing shield (12) via a bore extending through the bearing shield (12), wherein the wear plate (30) preferably has a local reinforcement (34) at the second opening (33), which is received in a recess (22) of the bearing shield (12).

10. Slit wall milling machine (10) according to the preceding claim, wherein the wear plate (30) comprises a plurality of first and second openings (32, 33) which are arranged symmetrically on the wear plate (30) in particular with respect to a central plane passing through the bearing shield (12) and through the milling wheel axis.

11. Slot wall milling machine (10) according to one of the preceding claims, wherein the wear plate (30) has the shape of an arc with preferably two straight and two arc-shaped curved edges and preferably partially surrounds a milling wheel bearing (13).

12. Slot wall milling machine (10) according to one of the preceding claims, wherein a control bar is arranged on the bearing shield (12) with which the adjustable cutting tool mechanically interacts when the milling wheel (14) is rotated, such that it automatically moves between the folded-in position and the unfolded position depending on the milling wheel rotation angle.

13. Slot wall milling machine (10) according to the preceding claim, wherein the adjustable cutting tool (18) is not spring-mounted and the adjustable cutting tool (18) and the control bar are arranged and designed such that the movement from the folded-in position to the unfolded position is effected via contacting the control bar and the movement from the unfolded position to the folded-in position is effected via contacting the control bar and / or a transition surface of the bearing shield (12) that is preferably chamfered relative to the milling wheel plane.

14. Slot wall milling machine (10) according to one of the preceding claims, wherein the adjustable cutting tool (18) is designed such that in the folded position it has an axial distance to the wear plate (30) and can be moved past it and in the unfolded position projects into an area radially next to the bearing plate (12).

15. Carrier device, in particular cable excavator or special foundation engineering equipment, with a diaphragm wall cutter (10) according to one of the preceding claims.

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