Cutting wheel for a trench wall cutter and method for the conversion of a cutting wheel

Abstract

The invention relates to a milling wheel for a slot wall cutter, with a drum-shaped hub on the outer circumference of which receptacles for milling teeth and at least one holder for a hinged tooth are arranged, the holder having a bearing pin as a pivot axis for pivotably and releasably holding the hinged tooth. According to the invention, a fixing device is arranged on the holder, which is designed to hold a fixed tooth mounted on the bearing pin in a fixed position.

Description

[0001] The invention relates to a cutting wheel for a trench wall cutter, comprising a drum-shaped hub, on the outer circumference of which receptacles for cutting teeth and at least one holder for a folding tooth are arranged, wherein the holder has a bearing pin as a pivot axis for pivotably and releasably holding the folding tooth, according to the preamble of claim 1.

[0002] The invention further relates to a method for converting a cutting wheel according to claim 12.

[0003] Generic cutting wheels for trench wall cutters are described, for example, in EP 1 548 192 B1, EP 0 291 027 B1, or DE 10 2019 135781 A1. Trench wall cutters with cutting wheels arranged laterally on a bearing plate have the problem that soil areas directly below the bearing plate cannot be easily removed by the cutting wheels. In softer soils, a soil ridge that forms below the bearing plate can easily be broken by the bearing plate and the weight of the trench wall cutter. In harder soils, the soil ridge below the bearing plate poses a problem and can lead to undesired deflection of the trench wall cutter.

[0004] To prevent this, so-called folding teeth can be mounted on the cutting wheels, either pivoting or folding, on brackets on the side of the cutting wheels adjacent to the bearing plate. For example, using a cam control with control bars on the bearing plate and control arms on the folding teeth, these can be folded out into an area below the bearing plate to work on the underlying soil. As the cutting wheel continues to rotate, the folding teeth are folded back in, preventing damage to the bearing plate from the cutting teeth.

[0005] If the folding teeth are not needed on softer soils, they impede efficient milling operations, as the speed of the milling wheels is limited by the folding teeth. At higher speeds, the folding action can cause numerous impacts, as well as significant friction and correspondingly high wear on the cam control.

[0006] In this case, it is well known that the folding teeth should be removed. However, the lack of cutting teeth on the outer circumference of the cutting wheel also impairs efficient cutting operation and leads to high wear on the mountings without cutting teeth.

[0007] It's also common practice to have different milling wheels for different soil types. These then need to be replaced. Replacing these milling wheels, which can weigh several tons, is time-consuming and labor-intensive.

[0008] The invention is based on the Task The aim is to provide a cutting wheel for a trench wall cutter and a method for converting it, which enables particularly efficient cutting operation.

[0009] The object is achieved, on the one hand, by a cutting wheel having the features of claim 1 and, on the other hand, by a method having the features of claim 12. Preferred embodiments are specified in the dependent claims.

[0010] The trench wall cutter according to the invention is characterized in that a fixing device is arranged on the holder, which is designed to hold a fixed tooth mounted on the bearing pin in a fixed position.

[0011] A first aspect of the invention is to provide a fixing device on the holder for the pivotable or foldable holder of the folding teeth, with which a removal tooth arranged on the bearing pin of the holder can be fixed or secured in a fixed position, preferably a radially outwardly projecting position. For this purpose, it can be particularly expedient to remove the folding tooth pivotally mounted on the bearing pin and replace it with a special fixed tooth. Alternatively, it is also possible to modify the existing folding tooth, for example by removing the section with the control arm, so that it is then held in a fixed position on the bearing pin by means of the fixing device and can no longer fold or pivot. In this case, it must be ensured that a cam control for positively controlling the folding movement of the folding tooth is deactivated, for example by releasing the control arm on the folding tooth.

[0012] The fixing device can, in principle, be designed in any known manner, whereby the position of the fixed tooth can be fixed by positive and / or non-positive locking. Clamping devices, preferably with clamping clamps, can be arranged for non-positive locking. Positive locking can be achieved by appropriate engagement elements or locking elements.

[0013] A preferred embodiment of the invention consists in that the holder has two bearing blocks which are spaced apart from one another and between which the bearing pin extends and is detachably held thereon. The bearing pin preferably extends in a transverse direction to a rotational axis of the cutting wheel, such that a folding tooth can be folded around the bearing pin, in particular in the direction of a bearing plate on which the cutting wheel is rotatably mounted. The holder with the two bearing blocks is preferably located on the outer circumference of the drum-shaped hub in an edge region which borders the bearing plate of a trench wall cutter. Preferably, several holders are arranged on each cutting wheel, in particular two, three or four holders, evenly distributed around the circumference.

[0014] According to a further embodiment of the invention, it is preferred that a first receiving hole for receiving a first end of the bearing pin is formed on a first bearing block, and a second receiving hole for receiving the second end of the bearing pin is formed on a second bearing block. The bearing pin is preferably cylindrical and forms a pivot axis. By receiving the bearing pin in the two opposite receiving holes in the two bearing blocks, a stable mounting of the bearing pin is achieved.

[0015] An advantageous development of the invention consists in that at least one receiving hole is designed as a through-hole for inserting and / or removing the bearing pin. The two receiving holes have a common center axis, with at least one receiving hole being designed as a through-hole. Thus, the bearing pin can be easily inserted through the preferably cylindrical through-hole and inserted into the other receiving hole. The other receiving hole can be a blind hole or also a through-hole. The bearing pin can be fixed in the receiving holes by a suitable securing device, for example with one or more locking screws.

[0016] The fixing device can in principle be designed in any suitable manner designed to hold a cutting tooth held on the bearing pin in a fixed position such that the cutting tooth cannot pivot on the cylindrical bearing pin. It is particularly preferred that the fixing device has at least one locking hole for receiving a locking pin in the holder. In particular, a locking hole can be provided on one or both bearing blocks of a holder, into which a locking pin is inserted for a positive and / or non-positive fixing of the fixed tooth to the bearing pin. The locking pin thus forms in particular a positive connection between the holder and the cutting tooth mounted on the bearing pin. This ensures that the tooth is precisely positioned on the bearing pin.

[0017] A further advantageous embodiment of the invention is that two locking holes are provided, and that a first locking hole is formed on the first bearing block and a second locking hole is formed on the second bearing block. In particular, a through hole can be formed on the fixed tooth to be accommodated, wherein the removal tooth is fixed by means of a single locking bolt in that the removal bolt extends from the first locking hole through the through hole on the removal tooth into the second locking hole on the opposite bearing block. This allows for reliable fastening of the fixed tooth to the holder despite the design of a cylindrical bearing bolt.

[0018] A preferred embodiment of the invention consists in that, to form a milling tooth with a folding tooth, a folding tooth is pivotally mounted on the bearing pin on the at least one holder. A folding tooth, within the meaning of the invention, is a removal tooth pivotally mounted on the bearing pin. This creates a milling wheel that can be used in a conventional manner, wherein the folding tooth can be pivoted during milling operation from a radially directed retraction position for moving past the bearing plate into an inclined folding or removal position in which the folding tooth can remove soil material below the bearing plate. During rotation of a milling wheel, the folding tooth, in cooperation with a control bar that is fixed relative to the bearing plate, can be pivoted or adjusted between the two positions in a basically known manner via a control arm or control section on the folding tooth.The removal tooth can be formed with at least one cutting edge, for example as a cutting tooth, and / or with at least one removal tip, for example as a round shank chisel.

[0019] According to one embodiment of the invention, a blind plug is inserted into the at least one locking hole to form a milling wheel with a folding tooth. If the locking hole of the fixing device is not required during conventional use of the milling wheel with a folding tooth, the insertion of a blind plug ensures that the locking hole on the holder does not undergo unnecessary wear or become clogged with soil material.

[0020] According to a further embodiment of the invention, it is preferred that, to form a milling wheel with a fixed tooth, a fixed tooth is mounted on the bearing pin, which is held in place by the fixing device. Within the meaning of the invention, the fixed tooth represents a removal tooth, which is held in a fixed position on the bearing pin by the fixing device. The fixed tooth can, in particular, have a radial orientation that corresponds to or is largely similar to the orientation of the other removal teeth on the milling wheel and, in particular, ensures that it passes the bearing plate. The fixed tooth does not cause soil removal below the bearing plate.

[0021] Preferably, the fixed tooth does not correspond to the folding tooth. To convert the cutting wheel, it is necessary in this case to first remove the folding tooth and its control arm and replace it with a fixed tooth. The fixed tooth is also mounted on the preferably cylindrical bearing pin, but the fixed tooth is designed to be secured in the desired position by means of the fixing device on the holder. The fixed tooth can, in particular, be shorter than a folding tooth.

[0022] It is particularly advantageous that, in order to form a milling wheel with the fixed tooth, a locking bolt is inserted into the at least one locking hole to hold the fixed tooth in a fixed position, and that the at least one locking bolt extends into a suitable recess in or on the fixed tooth and the fixed tooth is fixed on the bearing bolt.

[0023] In principle, a single locking pin can be provided on each bearing block, which engages in a correspondingly matching recess on the fixed tooth and thus secures it in a form-fitting manner. Preferably, a single locking pin can be provided, which extends, in particular, through a receptacle formed as a through hole on the fixed tooth from a first bearing block to a second bearing block of the bracket. This achieves a particularly stable fixation of the fixed tooth to the bracket. The fixed tooth sits on the bearing pin on one side and on the locking pin on the other.

[0024] The invention further comprises a trench wall cutter with a cutter frame, on the underside of which at least one bearing plate for rotatingly supporting at least one cutter wheel is arranged, wherein at least one cutter wheel according to the invention is arranged.

[0025] The trench wall cutter preferably has several cutting wheels, in particular one cutting wheel on each side of a plate-shaped bearing plate. This forms a pair of cutting wheels with a preferably coaxial axis of rotation on a bearing plate. It is particularly preferred that two bearing plates, each with a pair of cutting wheels, are arranged on the underside of the milling frame.

[0026] The invention can be used in any type of trench wall cutter, in particular in a CSM cutter, in which the cutting wheels have a removal and a mixing function for creating a soil mortar and no guide frame needs to be arranged, or a cutter with a rack-like guide frame, for example for a one- or two-phase process.

[0027] The invention further comprises a method for converting a cutting wheel according to the invention, wherein the method is characterized in that a folding tooth is pivotally mounted on the bearing pin of the at least one holder of the cutting wheel, which folding tooth is released and removed, and in that a fixed tooth is arranged on the bearing pin, which is held in a fixed position on the holder by the fixing device. In this way, a cutting wheel, and in particular a cutting wheel on a trench wall cutter, can be efficiently converted. By replacing one or more folding teeth with fixed teeth, it is possible to operate the cutting wheels at higher speeds on softer soils. A cam control of the folding teeth is protected during such use and prevented from unnecessary wear.

[0028] A preferred embodiment of the invention consists in the fixed tooth on the milling wheel holder being detached from the bearing pin and removed, and in the arrangement of a folding tooth on the bearing pin, which is pivotably mounted on the bearing pin of at least one milling wheel holder. Thus, a simple conversion can also be carried out in reverse, so that folding teeth can easily be used on a milling wheel with fixed teeth in the existing holder with a bearing pin, if this is necessary for milling harder soil layers.

[0029] The invention will be further explained below with reference to preferred embodiments, which are schematically illustrated in the drawings. In the drawings: Fig. 1 shows a perspective view of a construction machine with a trench cutter according to the invention; Fig. 2 shows an enlarged view of a trench cutter according to the invention; Fig. 3 shows a perspective view of a cutting wheel with a folding tooth according to the invention; Fig. 4 shows a cross-sectional view of a detail of a cutting wheel with a folding tooth according to the invention; Fig. 5 shows a partially sectioned perspective view of a holder with a folding tooth on a cutting wheel according to the invention; Fig. 6 shows a perspective view of a cutting wheel with a fixed tooth according to the invention; and Fig. 7 shows a partially sectioned perspective view of the holder on the cutting wheel according to Figure 6 with fixed tooth.

[0030] A construction machine 1 with a trench cutter 10 according to the invention is shown in Figure 1which is designed as a so-called CSM milling machine. The construction machine 1 can have a carrier device 2, which can be designed to be movable with an undercarriage 3. The undercarriage 3 can preferably comprise a crawler track. Arranged on the undercarriage 3 is an uppercarriage 4, which is preferably mounted so as to be rotatable about a vertical axis of rotation. A mast 5, which is preferably vertical during operation, can be articulated to the carrier device 2, in particular the uppercarriage 4, via an adjustment mechanism 7. The distance between the mast 5 and the uppercarriage 4 can preferably be changed via the adjustment mechanism 7, and the mast can be angled relative to the vertical.

[0031] The trench wall cutter 10 according to the invention can be moved vertically along the mast 5 using a lifting device 6 for insertion into the ground. In the illustrated embodiment, the lifting device 6 has a guide rod with which the trench wall cutter 10 can be guided along the mast 5. Furthermore, a propulsion force can also be exerted downwards on the trench wall cutter 10 via a propulsion device (not shown in detail) via the rod in order to increase the contact pressure during milling. A rod-shaped lifting device 6 can advantageously be used if the trench wall cutter 10 has a small, compact cutter frame 12 that does not have guide surfaces for guidance along the milled walls.

[0032] In principle, the lifting device 6 can also have a support cable instead of a guide rod, wherein the trench wall cutter 10 then preferably has a box-shaped cutter frame 12 with guide surfaces in order to guide the trench wall cutter 10 along the walls of the formed trench slot.

[0033] For the trench cutter 10 according to Figure 2A connection device for the lifting device can be arranged on an upper side of the milling frame 12, and preferably two plate-shaped bearing plates 14 can be arranged on an underside, on each of which a milling wheel 20 according to the invention is mounted on either side. The milling wheels 20 on a common bearing plate 14 form a so-called pair of milling wheels 20, which are rotatable about a common axis of rotation. Rotation can be effected by a suitable rotary drive, such as a hub motor in the hubs of the milling wheels 20 or via one or more drive motors on the milling frame 12, whereby torque can then be transmitted via a corresponding gear arrangement.

[0034] A single cutting wheel 20 is closer in Figure 3This preferably has a drum-shaped hub 22, on the outer circumference of which radially projecting, plate-shaped receptacles 24 are arranged, on each of which a milling tooth 26 is detachably and replaceably mounted in a generally known manner.

[0035] A holder 30 for a folding tooth 50 is arranged on an inner side of the hub 22 facing the bearing plate 14. The holder 30 can have a first bearing block 31 and a circumferentially spaced second bearing block 32, between which the folding tooth 50 is pivotally mounted. The folding tooth 50 can preferably have an approximately central bearing section 51, to which a receiving section 52 for releasably receiving and holding a milling tooth 26 is connected radially outward. Furthermore, a control arm 54 extending radially inward away from the bearing section 51 and having a sliding element 56 for controlling the pivoting movement of the folding tooth 50 can be arranged. One or more removal strips 35 can be attached to the outer sides of the two bearing blocks 31, 32 facing away from the folding tooth 50 to reduce wear and improve stock removal.

[0036] A basically known mechanical control for controlling the movement of the folding tooth 50 during the rotation of the cutting wheel 20 is shown in the schematic representation according to Figure 4 In the cross-sectional view of Figure 4 A lower portion of a bearing plate 14 is shown, on each of whose two side surfaces a cutting wheel 20 (only partially shown) with a hub 22 is arranged. On the outer sides of the bearing plate 14, an annular control bar 16 is arranged, each with an outwardly directed control surface for forming a cam control.

[0037] In the Figure 4On the right-hand cutting wheel 20, on the hub 22, a plate-shaped receptacle 24 for a cutting tooth 26 is shown on an axial outer side, and a holder 30 with a first bearing block 31 is shown on an axial inner side. A preferably substantially cylindrical bearing pin 38 can extend between the bearing blocks 31, 32 on the holder 30, forming a pivot axis 39 for the folding tooth 50.

[0038] The folding tooth 50, with its bearing section 51 and a through hole 53 provided therein, is pivotally mounted on the bearing pin 38 of the bracket 30. The receiving section 52 of the folding tooth 50 extends downwards to accommodate a milling tooth 26. Radially arranged on the bearing section 51 of the folding tooth 50 in the direction of the hub 22 is the control arm 54 with a sliding element 56, which serves as a type of control cam. The folding tooth 50 is mounted such that the sliding element 56 is pressed against the annular control bar 16 on the bearing plate 14.

[0039] According to the outer control surface on the control bar 16, the folding tooth 50 can thus be moved between a retracted position, in which the receiving section 52 with the cutting tooth 26 is directed substantially radially to the hub 22 and to the axis of rotation of the cutting wheel 20, and a Figure 4 The folding or cutting position shown in the figure can be swivelled. Figure 4In the removal position shown, the milling tooth 26 on the folding tooth 50 is pivoted into an area below the bearing plate 14 in order to remove soil material in this position and thus contribute to protecting the bearing plate 14 as well as increasing the removal rate and precisely guiding the milling wheel 20 in the soil. The folding tooth 50 can be in the folded position for preferably more than 180° during one rotation in order to remove the soil in the area of ​​the bearing plate 14 over the entire slot length.

[0040] The cutting wheel 20 according to the invention with the holder 30 is described in more detail below in connection with the partial sectional view according to Figure 5explained. The holder 30 according to the invention has a first bearing block 31 with a first receiving hole 33 and a second bearing block 32 with a second receiving hole 34, which is directed coaxially to the first receiving hole 33. To receive a folding tooth 50, the bearing bolt 38 can be pushed into the receiving holes 33, 34, which are preferably open on both sides, and through the through hole 53 on the folding tooth 50, as clearly shown in Figure 5 is shown. The folding tooth is pivotably mounted about the pivot axis 39 on the fixed bearing pin 38 via bushings 58.

[0041] Furthermore, on the holder 30 according to the invention, a first locking hole 41 is formed on the first bearing block 31 and a second locking hole 42 is formed on the second bearing block 32, which are each also designed as a through hole. In the illustration according to Figure 5Blind plugs 46 are inserted into the two locking holes 41, 42, since the locking holes 41, 42 are not required when pivotably holding a folding tooth 50.

[0042] According to the invention, a folding tooth 50 mounted in this way can be replaced by a fixed tooth 60 or, if necessary, converted into one. Figures 6 and 7 A possibility according to the invention is shown, wherein first the folding tooth 50 according to Figure 5 by loosening the bearing pin 38 from the holder 30. A fixed tooth 60 is then inserted into the holder 30 between the first bearing block 31 and the second bearing block 32, with the bearing pin 38 being pushed back into the two receiving holes 33, 34 and into a through hole 63 on the fixed tooth 60 and secured.

[0043] Similar to a folding tooth 50, the fixed tooth 60 has a bearing section 61 and a radially outwardly adjoining receiving section 62 for releasably receiving a milling tooth 26. However, in the illustrated embodiment, the fixed tooth 60 does not have a control arm for interacting with a control bar on the bearing plate.

[0044] However, a fixing section 64 with recesses 66 for forming a through hole adjoins the bearing section 61 of the fixed tooth 60 radially inward. To form a fixing device 40, a locking pin 48 is inserted into the two locking holes 41, 42 in the bearing blocks 31, 32. Any blind plugs 46 present can be removed from the locking holes 41, 42 beforehand. The locking holes 41, 42 in the bearing blocks 31, 32 are matched to the fixed tooth 60 on the bearing pin 38 in such a way that they are coaxially aligned with the at least one recess 66, so that the locking pin 48 extends from the first locking hole 41 in the first bearing block 31 through the recesses 66 on the fixed tooth 60 to the second locking hole 42 on the bearing block 32.

[0045] Thus, the fixed tooth 60 sits on both the bearing pin 38 and the locking pin 48, with the two pins 38, 48 each being held by the two bearing blocks 31, 32. This results in a fixed, non-pivoting mounting of the fixed tooth 60 in the holder 30. The milling tooth 26 held on the fixed tooth 60 is preferably directed radially, so that it can easily pass the bearing plate 14.

Claims

1. A milling wheel for a diaphragm wall cutter (10), having a drum-shaped hub (22), on the outer circumference of which there are arranged receptacles (24) for cutting teeth (26) and at least one holder (30) for a folding tooth (50), wherein the holder (30) has a bearing pin (38) for holding the folding tooth (50) pivotably and releasably about a pivot axis (39), characterised in that a fixing device (40) is arranged on the holder (30) and is configured to hold a fixed tooth (60) mounted on the bearing pin (38) in a fixed position.

2. The milling wheel according to claim 1, characterised in that the holder (30) has two bearing blocks (31, 32) which are spaced apart from one another and between which the bearing pin (38) extends and is releasably mounted thereon.

3. The milling wheel according to claim 1 or 2, characterised in that a first receiving hole (33) for receiving a first end of the bearing pin (38) is designed on a first bearing block (31) and a second receiving hole (34) for receiving a second end of the bearing pin (38) is designed on a second bearing block (32).

4. The milling wheel according to claim 3, characterised in that at least one receiving hole (33, 34) is configured as a through-hole for inserting and / or sliding out the bearing pin (38).

5. The milling wheel according to any one of claims 1 to 4, characterised in that the fixing device (40) has at least one locking hole (41, 42) for receiving a locking pin (48) in the holder (30).

6. The milling wheel according to claim 5, characterised in that two locking holes (41, 42) are provided, and in that a first locking hole (41) is designed on the first bearing block (31) and a second locking hole (42) is designed on the second bearing block (32).

7. The milling wheel according to any one of claims 1 to 5, characterised in that a folding tooth (50) is pivotably mounted on the bearing pin (38), in order to form a cutting wheel (20) with a folding tooth (50) on the at least one holder (30).

8. The milling wheel according to claim 7, characterised in that a dummy plug (46) is inserted into the at least one locking hole (41, 42) to form a cutting wheel (20) with a folding tooth (50).

9. The milling wheel according to any one of claims 1 to 6, characterised in that a fixed tooth (60) is mounted on the bearing pin (38) to form a cutting wheel (20) with a fixed tooth (60) and is fixedly held by means of the fixing device (40).

10. The milling wheel according to claim 9, characterised in that for forming a cutting wheel (20) with the fixed tooth (60), a locking pin (48) is inserted into the at least one locking hole (41, 42) for fixedly holding the fixed tooth (20), and in that the at least one locking pin (48) extends into a suitable recess (66) in the fixed tooth (60) and thus fixes the fixed tooth (60) on the bearing pin (38).

11. A diaphragm wall cutter with a cutter frame (12), on the underside of which at least one end shield (14) is arranged for rotatably supporting at least one cutting wheel (20), characterised in that at least one cutting wheel (20) according to any one of claims 1 to 10 is arranged.

12. A method for converting a cutting wheel (20) according to any one of claims 1 to 10, characterised in that a folding tooth (50) is pivotably mounted on the bearing pin (38) of the at least one holder (30) of the cutting wheel (20) and is released and removed, and in that a fixed tooth (60) is arranged on the bearing pin (38) and is held in a fixed position on the holder (30) by the fixing device (40).

13. The method according to claim 12, characterised in that the fixed tooth (60) on the holder (30) of the cutting wheel (20) is released from the bearing pin (38) and removed, and in that a folding tooth (50) is arranged on the bearing pin (38) and is pivotably mounted on the bearing pin (38) of the at least one holder (30) of the cutting wheel (20).

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