Slotted wall cutter with suction box

Abstract

The invention relates to a trench cutter comprising at least one milling wheel for shredding soil material and a suction box arranged radially adjacent to the milling wheel. The suction box has a base body which, on a suction side facing the milling wheel, includes at least one suction opening for extracting liquid containing soil material. The suction box comprises a cover detachably connected to the base body and at least partially covering the suction side. According to the invention, the cover has at least one recess which overlaps with the at least one suction opening and has a smaller diameter and / or a different shape than the at least one suction opening.The invention further relates to a set comprising a slot wall cutter according to the invention and at least one additional cover not connected to the base body, the at least one recess of which has a different shape and / or a different position than the at least one recess of the cover connected to the base body of the suction box. The invention further relates to a carrier device with a slot 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, as well as a set and 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 have 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 may be located on the underside of a cutter frame. A common configuration includes two pairs of cutter wheels, with each pair mounted on its own bearing plate, one cutter wheel on each side of the plate.

[0003] Such trench cutters typically have a suction box in the area between the cutter wheel pairs, which primarily serves to extract the excavated material from the trench. For this purpose, the suction box has a series of suction openings through which a wastewater pump extracts the liquid containing the excavated material. In certain embodiments, its additional function may include crushing the excavated material loosened by the cutter wheels.

[0004] Depending on the nature of the soil being milled, it may be necessary to adjust the shape and / or positioning of the extraction openings to ensure effective material removal. Since the extraction openings in the suction box cannot be adjusted after initial production with known solutions, either the entire suction box must be replaced or a second trench cutter with a different suction box design must be provided, which is cumbersome and costly.

[0005] The object of the present invention is therefore to advantageously further develop diaphragm wall milling machines of the type described and to overcome the aforementioned disadvantages. In particular, it should enable simple and quick adaptation of the suction box to different soil conditions.

[0006] 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.

[0007] According to the invention, a trench cutter is proposed which comprises at least one milling wheel for crushing soil material and a suction box arranged radially adjacent to the milling wheel. The trench cutter preferably has a milling frame and can be connected to a carrier vehicle. The suction box comprises a base body which has at least one suction opening on a suction side facing the milling wheel for extracting liquid containing soil material. Through the at least one suction opening, excavated material suspension located in the trench can be extracted and conveyed via a suction line, for example, to a processing plant.

[0008] To protect the base body from the harsh conditions in the milling slot, the suction box includes a cover that is detachably connected to the base body and at least partially covers the suction side. This cover can be easily removed from the base body and replaced with a new one when it reaches a certain wear level. In this case, the detachable connection should also include a welded joint that can be relatively easily disassembled on site. The cover is therefore not integrally formed with the base body. The base body may have a box-shaped structure.

[0009] According to the invention, the cover has at least one recess which overlaps with the at least one suction opening. The recess in the cover forms an opening through which liquid containing soil material can be extracted. Extraction thus takes place through the recess and the suction opening, which together form a suction passage of the suction box. Preferably, several suction openings are provided, with the cover having a number of recesses corresponding to the number of suction openings, which overlap each other.

[0010] According to the invention, the at least one recess in the cover has a smaller diameter than the at least one extraction opening underneath it. The cross-sectional area of ​​the extraction passage is thus formed by the smaller outer opening of the recess. This makes it possible to change the position of the at least one recess relative to the base body without having to modify the base body itself, since the cover can simply be removed from the base body and a different cover with differently arranged and / or differently shaped recess(s) can be attached. Because the at least one extraction opening is larger than the at least one recess, the position of the latter relative to the former can be changed while maintaining an overlap.

[0011] Alternatively or additionally, the at least one recess in the cover may have a different shape than the at least one extraction opening underneath it. For example, the extraction opening may be elongated and the recess round, both with the same width. The position of the recess may be shifted along the long side of the extraction opening so that they still overlap. The recess may also be narrower than the extraction opening.

[0012] Due to the different sizes and / or shapes of the at least one extraction opening in the base unit and the at least one recess in the cover, it is easy to change the position and / or shape of the extraction openings on an existing suction box at any time, even after initial delivery. The basic idea is to leave the structure of the suction box's base unit unchanged and to adjust the shape and / or position of the extraction openings simply by replacing the outer cover. This allows for quick and easy adaptation to different working conditions and floor surfaces.

[0013] InIn one possible embodiment, the at least one extraction opening has a larger dimension in the y-direction perpendicular to the axis of rotation of the milling wheel along the extraction side than the at least one recess in the cover. This allows the position of the at least one recess relative to the base body to be changed by replacing the cover and offsetting the at least one recess of the new cover along the y-direction compared to the old cover. For example, the height of the recess(es), and thus the height of the extraction opening(s) on the suction box, can be adjusted quickly and easily. The at least one extraction opening can, in particular, be designed as an elongated slot. The width of the elongated slot (i.e., the dimension transverse to the y-direction) can correspond to the width of the recess or be greater.Preferably, the at least one recess has a round shape or a substantially square shape (e.g. with rounded corners).

[0014] In In another possible embodiment, the cover is designed as a flat cover plate. The cover plate can, in particular, be a wear plate. Alternatively or additionally, the cover can be welded to the base body. To replace the cover, the existing weld is removed and a new cover plate is welded to the base body.

[0015] Replacing wear parts by cutting them off and re-welding them is standard practice on construction sites. To adapt the extraction vents, the wear plate can be easily removed and a modified wear plate welded onto the base.

[0016] In In another possible embodiment, the at least one recess has a different shape than the at least one extraction opening and is designed such that its opening contour (i.e., the edge of the opening) lies completely within or on the opening contour of the extraction opening below. The shape of the cross-sectional area of ​​the extraction passage is thus defined by the opening contour of the outer recess.

[0017] InIn another possible embodiment, the suction side is formed on a suction section of the base body, the suction section preferably having a cross-section with a substantially V-shaped outer contour. The suction side forms one leg of the V-profile or a section thereof. Preferably, both legs or sections of the V-profile are designed as suction sides with at least one suction opening. The V-profile can be straight or curved. The apex of the V-profile preferably points downwards (along the longitudinal axis of a milling frame of the slot wall cutter). This shape of the suction box allows for optimal placement in the space between radially spaced milling wheels.

[0018] In another possible embodiment, several, in particular identical, extraction openings are arranged on the extraction side, each extraction opening being covered by a corresponding recess in the cover. The cover thus includes, in particular, as many recesses as there are extraction openings on the base body. Preferably, the extraction openings are arranged side by side in an x-direction running parallel to the axis of rotation of the milling wheel along the extraction side. The multitude of extraction openings ensures optimal extraction of the debris suspension in the area of ​​the at least one milling wheel.

[0019] In another possible embodiment, the diaphragm cutter comprises two radially arranged and, in particular, counter-rotating milling wheels, with the suction box being arranged at least partially radially between the milling wheels. For this purpose, the suction box preferably has the previously described V-shaped extraction section. The base body comprises two extraction sides facing the respective milling wheels, each with at least one extraction opening. The extraction sides can be covered by two separate covers, each detachably connected to the base body, or by a single cover detachably connected to the base body (and, in particular, V-shaped), which at least partially covers the extraction sides.

[0020] In another possible embodiment, the slot wall cutter comprises two pairs of radially arranged milling wheels, wherein, in particular, each milling wheel of one milling wheel pair is arranged coaxially to a milling wheel of the other milling wheel pair. Either a separate suction box can be provided for each milling wheel pair, or both milling wheel pairs can share a common suction box.

[0021] In another possible embodiment, the diaphragm wall cutter comprises at least one bearing plate on which at least one milling wheel is rotatably mounted. A drive or gearbox (or part thereof) for driving the at least one milling wheel can be arranged within the bearing plate.

[0022] The at least one milling wheel has at least one adjustable cutting tool, which is arranged and designed such that it moves between a folded-in position and an extended position during rotation of the milling wheel. The adjustable cutting tool is located, in particular, on the outer circumference of the milling wheel. In the folded-in position, the adjustable cutting tool has an axial distance from the bearing shield, allowing it to move past the bearing shield without collision. In the extended position, however, it projects into an area radially adjacent to the bearing shield; that is, in the extended position, the adjustable cutting tool projects, with a view to the outer circumference of the milling wheel, specifically beyond the edge of the end face of the milling wheel facing the bearing shield. The at least one adjustable cutting tool enables the removal of excess material between the milling wheels and laterally and below the bearing shield.

[0023] The term "cutting tool" is not to be understood restrictively here and does not require actual cutting or the presence of a blade. Rather, it can refer to any element that can be used to shred or mill soil material, for example, a milling tooth with a conical tip.

[0024] Preferably, the base body has a recess designed such that the adjustable cutting tool moves through the recess in the extended position or during the transition between the folded and extended positions, i.e., projects into it. This makes it possible to design the adjustable cutting tool to be longer without it colliding with the suction box, thus improving the removal of soil material located laterally and / or below the bearing plate. The recess can be in the form of a trough or a suction surface recessed relative to the suction side.

[0025] Preferably, when the milling wheel rotates, an end of the adjustable cutting tool, radially spaced from the milling wheel, describes a track that runs through the recess, i.e., section by section within the imaginary extension of the suction side of the base body that extends across the recess. As the milling wheel rotates, the adjustable cutting tool thus enters the recess. The end of the adjustable cutting tool can be formed by a blade or cutting edge, or by the tip of a tooth.

[0026] In another possible embodiment, a common suction box is arranged between the milling wheel pairs, comprising two suction sides, each with a recess, with each recess being jointly assigned to two coaxially arranged milling wheels. In other words, each of the recesses faces one of the milling wheel pairs, so that when a milling wheel rotates, its adjustable cutting tools move through the respective recess.

[0027] In another possible embodiment, the recess is formed at least partially on or in the suction side of the base body of the suction box and has a suction surface facing the milling wheel with at least one suction opening. Because at least one suction opening is also arranged in the area of ​​the recess, debris suspension can be extracted more effectively from the milling wheel area. The opening arranged in the suction surface of the recess is referred to here as the second suction opening, while the at least one opening on the suction side constitutes the first suction opening.

[0028] Preferably, the suction box comprises at least one second cover, which is detachably connected to the base body, in particular by welding, and which at least partially covers the suction surface. This also allows for optimal protection of the area of ​​the recess in the base body. The second cover has at least one second recess that overlaps with the at least one second suction opening and has a smaller diameter and / or a different shape than the at least one second suction opening. The preceding descriptions regarding the associated properties, embodiments, and advantages apply analogously.

[0029] Alternatively, deviating from the concept implemented according to the invention for the first extraction openings and first recesses, it may be provided that the at least one second extraction opening and the at least one second recess are identically designed. This may be advantageous if the second cover has a small thickness and / or small dimensions and should therefore not be weakened by an enlarged extraction opening.

[0030] The at least one second recess may differ from the at least one first recess and may, for example, be smaller or larger and / or have a different shape. The same applies analogously to the first and second extraction openings in the main body.

[0031] In another possible embodiment, the trench cutter comprises a suction line fluidically connected to the at least one suction opening and a wastewater pump, by means of which liquid containing soil material can be drawn into the suction line through the at least one recess and the at least one suction opening in a manner known per se. The base body can form an internal suction chamber into which all the provided suction openings open and through which the liquid is drawn into the suction line. The wastewater pump can be arranged in a milling frame of the trench cutter.

[0032] In another possible embodiment, the slot wall cutter comprises a milling frame at the lower end of which at least one milling wheel and the suction box are arranged. The base of the suction box can be connected to the milling frame, e.g., via a mounting plate. Alternatively or additionally, the base can be connected to one or more bearing shields arranged at the lower end of the milling frame.

[0033] The present invention further relates to a set comprising a slot wall cutter according to the invention and at least one additional cover not connected to the base body, the at least one recess of which has a different shape and / or a different position than the at least one recess of the cover connected to the base body of the suction box.

[0034] To change the position and / or shape of the suction box's extraction ports, which are defined by the positions and / or shapes of the outer recesses, at least one cover of the suction box is removed and replaced with another cover in the desired position / shape. This solution allows for corresponding modifications to the suction box at any time, even in the field. This enables quick and easy adaptation to different working conditions and soil types.

[0035] The invention further relates to a carrier vehicle with a 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, 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 mast. The diaphragm wall cutter is, in particular, suspended from the carrier vehicle by a cable, which is guided via one or more pulleys 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 schematic frontal view; Figure 2: the base body of an embodiment of the suction box in a perspective view; Figure 3: the suction box with covers in a perspective view; Figure 4: a perspective view of the first and second covers according to an embodiment; Figure 5: a perspective view of a further first cover; and Figure 6: a perspective view of a further embodiment of the diaphragm wall cutter according to the invention.

[0037] In the Figure 1Figure 1 is a schematic front view of an embodiment of the slot wall cutter 10 according to the invention. The slot wall cutter 10 shown in this embodiment comprises a milling frame 11, which may, for example, include three frame parts that can be detachably connected to one another. Alternatively, the milling frame 11 may comprise more or fewer frame parts or be formed in one piece. The slot wall cutter 10 may be suspended from the top of the milling frame 11 on a support device (not shown here).

[0038] At the lower end of the milling frame 11 are several milling wheels 12, shown here only schematically, for removing and crushing soil material. The milling wheels 12 shown are arranged radially next to each other. Another pair of milling wheels may be located on the rear side, which is not visible here as it is concealed. The milling wheels 12 are rotatably mounted, in particular, on bearing plates 13, which are attached to the underside of the milling frame 11 and may include rotary drives or gearboxes for driving the milling wheels 12.

[0039] A suction box 20 is located between the milling wheels 12, and in particular above a plane formed by the axes of rotation of the milling wheels 12. This suction box has an elongated shape and runs parallel to the axes of rotation of the milling wheels 12. In the case of two pairs of milling wheels, a common suction box 20 is preferably used for both pairs. In the embodiment shown here, a bearing plate 13 with two coaxially arranged milling wheels 12 is located on each side of the suction box 20.

[0040] The suction box 20 serves to extract the overburden liquid suspension from the bottom trench by means of an overburden pump (not shown). The suction box 20 has, in particular, a box-shaped and / or symmetrical design and can be mounted on the underside of the milling frame 11.

[0041] The suction box 20 comprises a base body 22, which can form the basic steel structure of the suction box 20 connected to the milling frame 11. In the Figure 2 The basic steel structure 22 of an embodiment of the suction box 20 is shown in a perspective view. The suction box 20 has a lower suction section 23, which, viewed along the longitudinal axis of the milling wheel, can have a V-shaped profile, the beveled surfaces of which, facing the milling wheels 12, each form a suction side 24.

[0042] In the exemplary embodiment of the Figure 2 The base body 22 has a plurality of suction openings 26 on each suction side 24, which are connected via an internal volume or suction chamber of the base body 22 to a waste conveying pump, preferably arranged in the milling frame 11, which pumps the pumped suspension through a suction line (not shown), in particular running within the milling frame 11, e.g. to a processing plant. The suction openings 26 are arranged along an x-direction running parallel to the milling wheel axes of rotation (see figure). Fig. 2) arranged and, in particular, identically designed.

[0043] In the embodiment shown here, the suction box 20 comprises two covers 30, which are welded to the base body 22 and cover the suction sides 24. The covers 30 are wear plates that protect the basic steel structure of the base body 22 and can be easily replaced. The suction box 20 is in the Figure 3 with attached, in particular welded, covers 30, wherein one cover 30 is insulated in the Figure 4 The cover 30 includes several recesses 32 which, when assembled, cover the respective extraction openings 26, so that the recesses 32 and the extraction openings 26 together form an extraction passage of the suction box 20.

[0044] The recesses 32 have a smaller opening cross-section than the extraction openings 26 below. In particular, the extraction openings 26 are designed as elongated holes extending along a y-direction perpendicular to the x-direction along the extraction side 24 (cf. Fig. 2 ). The recesses 32 have a smaller extent in the y-direction and can have a circular opening contour.

[0045] In the exemplary embodiment of the Figures 3 and 4 The cover 30 has recesses 32 whose width (extension in the x-direction) is smaller than the width of the extraction openings 26. This makes it possible to subsequently enlarge the opening cross-section of the effective extraction passages by removing the old cover 30 from the base body 22 and replacing it with a different cover 30' with enlarged recesses 32'. An example of this is shown in the Figure 5shown. Alternatively, the recesses 32 could be further reduced in size or their shape / opening contour could be changed.

[0046] In addition to adjusting the size or shape (e.g., rectangular instead of round) of the recesses 32, it is also possible to change the positions of the recesses 32 relative to the base body 22. If, for example, the recesses 32 are offset further downwards in the y-direction, the elongated shape of the extraction openings 26 still results in an overlap.

[0047] The size and shape of the respective extraction openings 26 and recesses 32 can depend on the intended use, the floor conditions, and other circumstances. For example, the extraction openings 26 could have a width of approximately 80 mm and the recesses 32 an opening diameter of 60–80 mm, for example, approximately 65 mm. These values ​​are, of course, only examples and can also be larger or smaller.

[0048] In principle, the extraction sides 24 can be flat and only one type of extraction opening 26 or recess 32 can be provided.

[0049] Alternatively, the base body 22 can have a recess 29 on each extraction side 24 in the form of a trough or an extraction surface recessed relative to the extraction side 24, in order to provide space for adjustable cutting tools 15 of the milling wheels 12, as explained below. An example of such a recess 29 is shown in the Figure 3 shown. This can be located centrally on the extraction side 24 and can also have its own extraction opening 28. For the sake of clarity, the extraction opening provided on the extraction surface of the recess 29 will be referred to as the second extraction opening 29, and the other extraction openings formed on the extraction side 24 will be referred to as the first extraction openings 26.

[0050] Preferably, the extraction surface of the recess 29 is protected by a separate cover 40, which is hereinafter referred to as the second cover 40 in contrast to the first cover 30 covering the first extraction openings 26. An example of such a second cover 40 is shown in the Figures 3 and 4 shown. For this purpose, the first cover 30 has a corresponding recess 34 that is complementary to the contour of the second cover 40.

[0051] It should be noted that the Figure 2 The second extraction opening 28 is shown, but not the recess 29 formed in the extraction side 24. This recess may either not be present at all, with the space for the adjustable cutting tools 15 provided only by a thinner second cover 40, or the recess 29 may be formed in the base body 22, as is the case, for example, in the Figure 3The recess 29 or the second cover 40 can be one of the examples of the Figures 3-4 exhibit a different shape.

[0052] The second cover 40 has, in particular, a second recess 42 which, in the assembled state, overlaps with the second extraction opening 28. The second extraction opening 28 and the second recess 42 can have identical opening cross-sections or shapes, or the second extraction opening 28, like the first extraction openings 26, can have a greater length and / or a different shape than the second recess 42, so that the extraction passage realized at the recess 29 can be changed by replacing the second cover 40.

[0053] More than one second extraction opening 28 can be provided on the extraction surface of the recess 29, as well as more than one second recess 42 in the second cover 40.

[0054] The second cover 40 preferably has a lesser thickness (e.g. 3-7 mm) than the first cover 30 in order to provide more space for the adjustable cutting tools 15.

[0055] The Figure 6 Figure 1 shows a further embodiment of the diaphragm wall cutter 10 according to the invention in a perspective view, showing a possible installation position of the overburden pump 16. Figure 6The milling wheels 12 are shown in more detail, and it can be seen that they can have several fixed cutting tools 14 on their outer circumferential surfaces, as well as adjustable cutting tools 15 in the area of ​​the bearing shields 13 for removing and crushing soil material. These cutting tools 14, 15 can also be referred to as crushing tools and, in the embodiment shown here, are designed as flat milling teeth, which can comprise a base body and a blade 34 attached therein. Alternatively, the cutting tools 14, 15 can, for example, be designed as milling teeth with conical tips.

[0056] The cutting tools 14, 15 must pass both the suction side 24 of the suction box 20 and the bearing shield 13 during rotation of the respective milling wheel 12 without colliding with each other. The distance between the suction side 24 and the outer circumferential surfaces of the milling wheels 12 therefore determines the maximum radial length of the cutting tools 14, 15. To effectively remove soil material even between the milling wheels 12, in an area adjacent to the narrow sides of the bearing shield 13, the outer cutting tools 15, which pass directly by the bearing shield 13, are preferably not fixed to the milling wheel 12 but adjustable. These adjustable cutting tools 15 can pivot about an axis of rotation between a folded-in position and an extended position and are therefore also referred to as hinged teeth.

[0057] In the folded position, these adjustable cutting tools 15 are pivoted away from the bearing plate 13 so that they can move past it without collision. In the unfolded position, the adjustable cutting tools 15 are pivoted or unfolded towards the bearing plate 13 so that they protrude into the area next to or below the bearing plate 13 and remove any soil material present there. Folding and unfolding can be accomplished in a known manner by contacting a cam guide or control strip (not shown) arranged on the bearing plate 13.

[0058] To enable the adjustable cutting tools 15 to be longer and thus remove more soil material between the milling wheels 12, the previously described recesses 29 can be provided on the suction box 20, into which the adjustable cutting tools 15 dip or protrude as they move past. The outermost ends of the adjustable cutting tools 15 describe, in particular, tracks that run through the recesses 29, so that the adjustable cutting tools 15 do not collide with the suction box 20 in the extended position or during the transition between the extended and retracted positions.

[0059] Instead of a design with a common suction box 20 for both milling wheel pairs, a separate suction box 20 can be provided for each milling wheel pair, for example with its own recess 29 on each extraction surface 24. Reference symbol list:

[0060] 10 Slot wall cutter 11 Cutter frame 12 Cutter wheel 13 Bearing plate 14 Fixed cutting tool 15 Adjustable cutting tool 16 Waste pump 20 Suction box 22 Base body 23 Suction section 24 Suction side 26 Suction opening / first suction opening 28 Second suction opening 29 Recess 30 Cover / first cover 30' Further cover / further first cover 32 Recess / first recess 32' Recess / first recess 34 Recess in cover 40 Second cover 42 Second recess

Claims

1. Diaphragm wall cutter (10) comprising at least one milling wheel (12) for crushing soil material and a suction box (20) arranged radially next to the milling wheel (12) with a base body (22) which includes at least one suction opening (26) for extracting liquid containing soil material on a suction side (24) facing the milling wheel (12), wherein the suction box (20) comprises a cover (30) detachably connected to the base body (22) and at least partially covering the suction side (24), characterized by that the cover (30) has at least one recess (32) which overlaps with the at least one extraction opening (26) and has a smaller diameter and / or a different shape than the at least one extraction opening (26).

2. Slot wall milling machine (10) according to claim 1, wherein the at least one extraction opening (26) has a larger extent in a y-direction perpendicular to the axis of rotation of the milling wheel (12) along the extraction side (24) than the at least one recess (32) of the cover (30) and is in particular designed as an elongated hole, wherein the at least one recess (32) preferably has a round or substantially square shape.

3. Slit wall milling machine (10) according to claim 1 or 2, wherein the cover (30) is designed as a cover plate, in particular as a wear plate, and / or is welded to the base body (22).

4. Slot wall milling machine (10) according to one of the preceding claims, wherein the at least one recess (32) has a different shape than the at least one extraction opening (26) and is designed such that its opening contour lies completely within or on the opening contour of the extraction opening (26) below.

5. Slit wall milling machine (10) according to one of the preceding claims, wherein the extraction side (24) is formed on an extraction section (23) of the base body (22), wherein the extraction section (23) preferably has a cross-section with a substantially V-shaped outer contour.

6. Slot wall milling machine (10) according to one of the preceding claims, wherein several extraction openings (26) of particularly identical design are arranged on the extraction side (24), wherein each extraction opening (26) is covered by a corresponding recess (32) of the cover (30), wherein the extraction openings (26) are preferably arranged next to each other in an x-direction parallel to the axis of rotation of the milling wheel (12) along the extraction side (24).

7. Slit wall milling machine (10) according to one of the preceding claims, comprising two radially arranged and in particular counter-rotating milling wheels (12), wherein the suction box (20) is arranged at least partially radially between the milling wheels (12), wherein the base body (22) comprises two extraction sides (24) facing the respective milling wheels (12), each with at least one extraction opening (26), wherein the suction box (20) preferably comprises two separate covers (30) detachably connected to the base body (22) or a single cover (30) detachably connected to the base body (22), which at least partially covers the extraction sides (24).

8. Diaphragm wall cutter (10) according to one of the preceding claims, comprising two pairs of radially arranged milling wheels (12), wherein in particular each milling wheel (12) of a milling wheel pair is arranged coaxially to a milling wheel (12) of the other milling wheel pair, wherein the diaphragm wall cutter (10) comprises a separate suction box (20) for each milling wheel pair or a common suction box (20) for both milling wheel pairs.

9. Slit wall milling machine (10) according to one of the preceding claims, comprising at least one bearing plate (13) on which at least one milling wheel (12) is rotatably mounted, wherein the at least one milling wheel (12) has at least one adjustable cutting tool (15) which is arranged and designed such that, when the milling wheel (12) is rotated, it moves between a folded-in position, in which it has an axial distance to the bearing plate (13) and can be moved past it, and an unfolded position, in which it projects into an area radially adjacent to the bearing plate (13), wherein the base body (22) preferably has a recess (29) which is designed such that the adjustable cutting tool (15) moves through the recess (29) in the unfolded position or during the transition between the folded-in position and the unfolded position.

10. Slot wall milling machine (10) according to the two preceding claims, wherein a common suction box (20) is arranged between the pairs of milling wheels and comprises two extraction sides (24) each with a recess (29), wherein each recess (29) is jointly assigned to two coaxially arranged milling wheels (12).

11. Slit wall milling machine (10) according to one of the two preceding claims, wherein the recess (29) is formed at least partially on the extraction side (24) and has an extraction surface facing the milling wheel (12) with at least one second extraction opening (28), wherein the suction box (20) preferably comprises a second cover (40) which is detachably connected to the base body (22), in particular welded, and which at least partially covers the extraction surface, wherein the second cover (40) has at least one second recess (42) which overlaps with the at least one second extraction opening (28) and has a smaller diameter and / or a different shape than the at least one second extraction opening (28).

12. Diaphragm wall cutter (10) according to one of the preceding claims, comprising a suction line fluidically connected to the at least one suction opening (26) and a wastewater pump (16), by means of which liquid containing soil material can be drawn into the suction line through the at least one recess (32) and the at least one suction opening (26) and preferably a suction chamber formed inside the base body (22), wherein the wastewater pump (18) is preferably arranged in a milling frame (11) of the diaphragm wall cutter (10).

13. Diaphragm wall milling machine (10) according to one of the preceding claims, comprising a milling frame (11) at the lower end of which the at least one milling wheel (12) and the suction box (20) are arranged, wherein the base body (22) of the suction box (20) is connected to the milling frame (11) and / or to at least one bearing plate (13) arranged on the milling frame (11).

14. Set comprising a slot wall cutter (10) according to one of the preceding claims and at least one additional cover (30') not connected to the base body (22), the at least one recess (32') of which has a different shape and / or position than the at least one recess (32) of the cover (30) connected to the base body (22) of the suction box (20).

15. Carrier device with a diaphragm wall cutter (10) according to one of claims 1 to 13.

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