EP4311881A1 - Cutting wheel for a trench wall cutter and method for the conversion of a cutting wheel - Google Patents

Abstract

The invention relates to a cutting wheel for a trench wall cutter, with 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, the holder having a bearing pin as a pivot axis for pivotably and releasably holding the folding tooth. According to the invention it is provided 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.

Description

The invention relates to a cutting wheel for a trench wall cutter, with 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, the holder having a bearing pin as a pivot axis for pivotably and releasably holding the folding tooth., according to the preamble of claim 1.

The invention further relates to a method for converting a milling wheel according to claim 12.

Generic cutting wheels for trench wall cutters, for example, come from the EP 1 548 192 B1 or the EP 0 291 027 B1 out. In the case of trench wall cutters with cutting wheels arranged laterally on a bearing plate, there is the problem that soil areas immediately below the bearing plate cannot easily be removed by the cutting wheels. In softer soils, a soil bar that forms below the end shield can easily be broken by the weight of the trench wall cutter. On harder soils, the floor web below the end shield poses a problem and can lead to undesirable deflection of the trench wall cutter.

To avoid this, so-called folding teeth on the milling wheels can be pivotably or foldably mounted on brackets on the side of the milling wheels, which adjoins the bearing plate. For example, using a cam control with control strips on the end shield and control arms on the folding teeth, these can be folded out into an area below the end shield in order to process the floor area underneath, while the milling wheel continues to rotate Folding teeth can be folded back in so that the end shield is not damaged by the milling teeth.

If the folding teeth are not needed on softer soils, they represent a hindrance to efficient milling operation, since the speed of the milling wheels is limited by the folding teeth. At higher speeds, flapping can cause a corresponding number of impacts as well as considerable friction and correspondingly high wear on the cam control.

It is known to remove the folding teeth in this case. However, the lack of removal teeth on the outer circumference of the cutting wheel also impairs efficient milling operation and leads to high wear on the holders without removal teeth.

It is also known to have different milling wheels for different types of soil. These then have to be exchanged. However, replacing the milling wheels, which can weigh up to several tons, is time-consuming and labor-intensive.

The invention is based on the object of specifying a cutting wheel for a trench wall cutter and a method for conversion, with which a particularly efficient milling operation is possible.

The task is solved on the one hand by a milling wheel with the features of claim 1 and on the other hand by a method with the features of claim 12. Preferred embodiments are specified in the dependent claims.

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.

A first aspect of the invention is to provide a fixing device on the holder when holding the folding teeth in a pivoting or folding manner, with which a removal tooth, which is arranged on the bearing pin of the holder, is fixed in a fixed position, preferably a position projecting radially outwards or can be set. For this purpose, it may be particularly useful to remove the folding tooth, which is pivotally mounted on the bearing pin, and replace it with a special fixed tooth. Alternatively, it is also possible to use the existing one Folding tooth, for example by dismantling 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. It must be ensured that a cam control for positively controlling the folding movement of the folding tooth is disabled, for example by loosening the control arm on the folding tooth.

The fixing device can in principle be designed in any known manner, with the fixed tooth being able to be fixed in position in a form-fitting and/or force-fitting manner. In particular, clamping devices, preferably with clamping clamps, can be arranged for non-positive fixing. A positive fixation can take place via appropriate engagement elements or locking elements.

A preferred embodiment of the invention is that the holder has two bearing blocks, which are spaced apart from one another and between which the bearing pin extends and is releasably held thereon. The bearing pin preferably extends in a transverse direction to an axis of rotation of the cutting wheel, so 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 at an edge area which adjoins the bearing plate of a trench wall cutter. Preferably, several holders are arranged on each cutting wheel, distributed evenly around the circumference, in particular two, three or four holders.

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 accommodating the bearing pin in the two opposite receiving holes in the two bearing blocks, a stable holding of the bearing pin is achieved.

An advantageous development according to the invention is that at least one receiving hole acts as a through hole for pushing in and/or pushing out of the bearing pin is formed. The two receiving holes have a common center axis, with at least one receiving hole being designed as a through hole. The bearing pin can thus 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 bolt can be fixed in the receiving holes using a suitable securing device, such as one or more securing screws.

The fixing device can basically be designed in any suitable manner, which is designed to hold an abrasion tooth held on the bearing pin in a fixed position, so that the abrasion tooth cannot be pivoted on the cylindrical bearing pin. It is particularly preferred that the fixing device has at least one locking hole for receiving a locking bolt in the holder. In particular, a locking hole can be made on one or both bearing blocks of a holder, into which a locking pin is inserted in order to secure the fixed tooth to the bearing pin in a positive and/or non-positive manner. The locking bolt in particular forms a positive connection between the holder and the removal tooth mounted on the bearing bolt. This achieves a precise positioning of the tooth on the bearing pin.

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 picked up, the removal tooth being 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 the fixed tooth to be reliably secured to the holder despite the design of a cylindrical bearing pin.

A preferred embodiment of the invention is that in order to form a milling tooth with a folding tooth on the at least one holder, a folding tooth is pivotally mounted on the bearing pin. A folding tooth is within the meaning of the invention an abrasion tooth pivotably mounted on the bearing pin. This creates a milling wheel which can be used in a conventional manner, wherein the folding tooth can be pivoted during milling operation from a radially directed retraction position to pass the end shield into an oblique folding or removal position, in which the folding tooth can remove soil material below the end shield . During the rotation of a milling wheel, the folding tooth can be pivoted or adjusted between the two positions in a fundamentally known manner in cooperation with a control bar, which is fixed relative to the bearing plate, via a control arm or control section on the folding tooth. The removal tooth can be designed 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

According to one embodiment of the invention, it is provided that 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 in the conventional use of the milling wheel with folding tooth, an inserted blind plug ensures that the locking hole on the holder does not wear unnecessarily or become clogged with soil material.

According to a further embodiment of the invention, it is preferred that, in order to form a milling wheel with a fixed tooth, a fixed tooth is mounted on the bearing pin, which is held in a fixed manner by means of the fixing device. In the sense of the invention, the fixed tooth represents a removal tooth which is held in a fixed position on the bearing pin by means of the fixing device. The fixed tooth can in particular have a radial orientation which corresponds to an orientation of the other removal teeth on the cutting wheel or is largely similar to this and in particular ensures that it passes the end shield. The fixed tooth does not cause soil erosion below the end shield.

Preferably, the fixed tooth does not correspond to the folding tooth. In order to convert the cutting wheel, in this case it is necessary to first remove the folding tooth with 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 attached to the holder in the by means of the fixing device desired position. The fixed tooth can in particular be designed to be shorter than a folding tooth.

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 for holding the fixed tooth firmly and that the at least one locking bolt extends into a suitable recess in or on the fixed tooth and the fixed tooth on the Bearing bolt is fixed.

In principle, a single locking bolt can be provided on each bearing block, which engages in a correspondingly matching recess on the fixed tooth and thus fixes it in a form-fitting manner. Preferably, a single locking bolt can be provided, which extends in particular through a receptacle on the fixed tooth designed as a through hole from a first bearing block to a second bearing block of the holder. This results in a particularly stable fixation of the fixed tooth on the holder. The fixed tooth sits on the bearing pin on the one hand and on the locking pin on the other.

The invention further comprises a trench wall cutter with a cutter frame, on the underside of which at least one bearing plate is arranged for rotating bearings at least one cutting wheel, with at least one cutting wheel according to the invention being arranged.

The trench wall cutter preferably has several cutting wheels, in particular one cutting wheel on each side of a plate-shaped bearing plate. In this way, a pair of milling wheels with a preferably coaxial axis of rotation is formed on a bearing plate. It is particularly preferred that two end shields, each with a pair of milling wheels, are arranged on the underside of the milling frame.

The invention can be used with any type of trench wall milling machine, in particular with a CSM milling machine, in which the milling wheels have a removal and a mixing function to create a floor mortar and no guide frame has to be arranged, or a milling machine with a frame-like guide frame, for example One or two phase process.

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

A preferred embodiment variant of the invention consists in that the fixed tooth on the holder of the cutting wheel is detached from the bearing pin and removed and that a folding tooth is arranged on the bearing pin, which is pivotally mounted on the bearing pin of the at least one holder of the cutting wheel. A problem-free conversion can also be carried out in the opposite way, so that folding teeth can easily be used on a milling wheel with fixed teeth in the existing holder with bearing bolts if this is necessary when milling harder soil layers.

Fig. 1

eine perspektivische Ansicht einer Baumaschine mit einer erfindungsgemäßen Schlitzwandfräse;

Fig. 2

eine vergrößerte Darstellung einer erfindungsgemäßen Schlitzwandfräse;

Fig. 3

eine perspektivische Ansicht eines erfindungsgemäßen Fräsrades mit Klappzahn;

Fig. 4

eine Querschnittsansicht eines Details zu einem erfindungsgemäßen Fräsrad mit Klappzahn;

Fig. 5

eine teilgeschnittene perspektivische Ansicht zu einer Halterung mit Klappzahn an einem erfindungsgemäßen Fräsrad;

Fig. 6

eine perspektivische Ansicht zu einem erfindungsgemäßen Fräsrad mit Festzahn und

Fig. 7

eine teilgeschnittene perspektivische Ansicht zu der Halterung an dem Fräsrad gemäß Figur 6 mit Festzahn.

The invention is further explained below using preferred exemplary embodiments, which are shown schematically in the drawings. Shown in the drawings:

Fig. 1

a perspective view of a construction machine with a trench wall cutter according to the invention;

Fig. 2

an enlarged view of a trench wall cutter according to the invention;

Fig. 3

a perspective view of a milling wheel according to the invention with folding teeth;

Fig. 4

a cross-sectional view of a detail of a milling wheel according to the invention with folding teeth;

Fig. 5

a partially sectioned perspective view of a holder with a folding tooth on a cutting wheel according to the invention;

Fig. 6

a perspective view of a milling wheel according to the invention with fixed teeth and

Fig. 7

a partially sectioned perspective view of the holder on the milling wheel Figure 6 with fixed tooth.

A construction machine 1 with a trench wall cutter 10 according to the invention is in Figure 1 shown, which 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. Preferably, the undercarriage 3 can include a crawler chassis. A superstructure 4 is arranged on the undercarriage 3, which is preferably rotatably mounted about a vertical axis of rotation. On the carrier device 2, in particular the superstructure 4, a mast 5, which is preferably vertical during operation, can be articulated via an adjustment mechanism 7. The distance between the mast 5 and the superstructure 4 can preferably be changed via the adjustment mechanism 7 and the mast can be angled relative to the vertical.

Along the mast 5, the trench wall cutter 10 according to the invention can be vertically movable with a lifting device 6 for insertion into the ground. In the exemplary embodiment shown, 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) via the rod in order to increase the pressure force 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, which has no guide surfaces for guiding along the cutter walls.

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

For the trench wall cutter 10 according to Figure 2 A connecting device for the lifting device can be arranged on an upper side of the milling frame 12 and preferably two plate-shaped end shields 14 can be arranged on an underside, on which a milling wheel 20 according to the invention is mounted on both sides. 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. A rotation can be caused 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.

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

A holder 30 for a folding tooth 50 is arranged on an inside of the hub 22 facing the end shield 14. The holder 30 can have a first bearing block 31 and a second bearing block 32 spaced apart in the circumferential direction, 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 outwards. Furthermore, a control arm 54 extending radially inwards from the bearing section 51 can be arranged with a sliding element 56 for controlling the pivoting movement of the folding tooth 50. One or more removal bars 35 can be attached to the outer sides of the two bearing blocks 31, 32 facing away from the folding tooth 50 in order to reduce wear and improve removal performance.

A basically known mechanical control for controlling the movement of the folding tooth 50 during the rotation of the cutting wheel 20 can be seen in the schematic representation Figure 4 out. In the cross-sectional view of Figure 4 a lower region of a bearing plate 14 is shown, on the two side surfaces of which a milling wheel 20, only partially shown, with a hub 22 is arranged. There is an annular control bar on the outside of the end shield 14 16 each arranged with an outwardly directed control surface to form a cam control.

In the Figure 4 are shown on the right cutting wheel 20 on the hub 22 on an axial outside a plate-shaped receptacle 24 for a cutting tooth 26 and on an axial inside a holder 30 with a first bearing block 31. A preferably substantially cylindrical bearing pin 38 can extend on the holder 30 between the bearing blocks 31, 32 and forms a pivot axis 39 for the folding tooth 50.

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

According to the outer control surface on the control bar 16, the folding tooth 50 can be switched between a retracted position in which the receiving section 52 with the milling tooth 26 is directed essentially radially to the hub 22 and to the axis of rotation of the milling wheel 20, and one in Figure 4 shown folding or removal position can be pivoted. In the in Figure 4 In the removal position shown, the milling tooth 26 on the folding tooth 50 is pivoted into an area below the end shield 14 in order to remove soil material in this position and thus contribute to protecting the end shield 14 as well as to increasing the removal rate and to the precise guidance of the milling wheel 20 in the ground. The folding tooth 50 can be in the folding position during one revolution, preferably more than 180 °, in order to remove the soil in the area of the end shield 14 over the entire length of the slot

The milling wheel 20 according to the invention with the holder 30 is described in more detail below in connection with the partial sectional view Figure 5 explained. 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 accommodate 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 thereby through the through hole 53 on the folding tooth 50, as clearly shown in Figure 5 is shown. The folding tooth is mounted on the fixed bearing pin 38 via bushings 58 so that it can pivot about the pivot axis 39.

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, each of which is also designed as a through hole. According to the representation Figure 5 Blind plugs 46 are inserted into the two locking holes 41, 42, since the locking holes 41, 42 are not required when holding a folding tooth 50 in a pivotable manner.

According to the invention, a folding tooth 50 mounted in this way can be replaced by a fixed tooth 60 or, if necessary, converted for this purpose. In the Figures 6 and 7 A possibility according to the invention is shown, with the folding tooth 50 initially being shown in accordance with Figure 5 has been removed from the holder 30 by loosening the bearing bolt 38. A fixed tooth 60 is then inserted into the holder 30 between the first bearing block 31 and the second bearing block 32, the bearing pin 38 being inserted and fastened again into the two receiving holes 33, 34 and into a through hole 63 on the fixed tooth 60.

The fixed tooth 60 has, similar to a folding tooth 50, a bearing section 61 and a receiving section 62 adjoining radially outwards for releasably receiving a milling tooth 26. However, in the exemplary embodiment shown, the fixed tooth 60 does not have a control arm for interacting with a control bar on the end shield.

However, a fixing section 64 with recesses 66 for forming a through hole adjoins the bearing section 61 of the fixed tooth 60 radially inwards. To form a fixing device 40, a locking bolt 48 is inserted into the two locking holes 41, 42 in the bearing blocks 31, 32. Any blind plugs 46 that may be 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 extends through to the second locking hole 42 on the bearing block 32.

The fixed tooth 60 thus 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-pivotable 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 run past the bearing plate 14.

Claims (13)

Cutting wheel for a trench wall cutter (10), with a drum-shaped hub (22), on the outer circumference of which receptacles (24) for cutting teeth (26) and at least one holder (30) for a folding tooth (50) are arranged, the holder (30) has a bearing pin (38) for pivotably and releasably holding the folding tooth (50) about a pivot axis (39),
characterized,
in that a fixing device (40) is arranged on the holder (30), which is designed to hold a fixed tooth (60) mounted on the bearing pin (38) in a fixed position. Milling tooth according to claim 1,
characterized,
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 held thereon. Milling wheel according to claim 1 or 2,
characterized,
in that on a first bearing block (31) a first receiving hole (33) for receiving a first end of the bearing pin (38) and on a second bearing block (32) a second receiving hole (34) for receiving a second end of the bearing pin (38) are formed . Milling wheel according to claim 3,
characterized,
that at least one receiving hole (33, 34) is designed as a through hole for pushing in and / or pushing out the bearing pin (38). Milling wheel according to one of claims 1 to 4,
characterized,
that the fixing device (40) has at least one locking hole (41, 42) for receiving a locking bolt (48) in the holder (30). Milling wheel according to claim 5, characterized, that two locking holes (41, 42) are provided and that a first locking hole (41) is formed on the first bearing block (31) and a second locking hole (42) on the second bearing block (32). Milling wheel according to one of claims 1 to 5,
characterized,
in that to form a milling wheel (20) with a folding tooth (50) on the at least one holder (30), a folding tooth (50) is pivotally mounted on the bearing pin (38). Milling wheel according to claim 7,
characterized,
in that a blind plug (46) is inserted into the at least one locking hole (41, 42) to form a milling wheel (20) with a folding tooth (50). Milling wheel according to one of claims 1 to 6,
characterized,
that in order to form a milling wheel (20) with a fixed tooth (60), a fixed tooth (60) is mounted on the bearing pin (38), which is held in a fixed manner by means of the fixing device (40). Milling wheel according to claim 9, characterized, that in order to form a milling wheel (20) with the fixed tooth (60), a locking bolt (48) is inserted into the at least one locking hole (41, 42) to hold the fixed tooth (20) in place and that the at least one locking bolt (48) extends into a suitable recess (66) in the fixed tooth (60) and thus fixes the fixed tooth (60) on the bearing bolt (38). Trench wall milling machine with a milling frame (12), on the underside of which at least one bearing plate (14) is arranged for rotating bearings at least one milling wheel (20),
characterized,
that at least one cutting wheel (20) is arranged according to one of claims 1 to 10. Method for converting a milling wheel (20) according to one of claims 1 to 10, characterized, that a folding tooth (50) is pivotally mounted on the bearing pin (38) of the at least one holder (30) of the cutting wheel (20), which is loosened and removed, and that a fixed tooth (60) is arranged on the bearing pin (38), which is held in a fixed position on the holder (30) by the fixing device (40). Method according to claim 12, characterized, that the fixed tooth (60) on the holder (30) of the milling wheel (20) is loosened from the bearing pin (38) and removed and that a folding tooth (50) is arranged on the bearing pin (38), which is pivotally mounted on the bearing pin (38) of the at least one holder (30) of the cutting wheel (20).

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