WO2023016915A1

WO2023016915A1 - Cutting wheel

Info

Publication number: WO2023016915A1
Application number: PCT/EP2022/071954
Authority: WO
Inventors: Johannes Herb; Sebastian Soier
Original assignee: Bauer Maschinen Gmbh
Priority date: 2021-08-13
Filing date: 2022-08-04
Publication date: 2023-02-16
Also published as: KR20240021980A; CN117693621A; KR20240025667A

Abstract

The invention relates to a cutting wheel (30) for a diaphragm wall cutter (10) having a drum-shaped hub (32), on the outer circumference of which there are arranged tooth holders (40) in which cutting teeth (50) for removing soil material are releasably held, wherein the cutting teeth (50) project radially outwards and have a tooth head (60) having at least one first cutting element (66) and a tooth root (52). There is provision according to the invention that, on an end side of the tooth holders (40) that is directed in the direction of rotation of the cutting wheel (30), there is mounted at least one attachment tool (90) which is directed in the direction of rotation and has at least one second cutting element (97) which is arranged spaced apart from the respective cutting tooth (50).

Description

MILLING WHEEL

The invention relates to a cutting wheel for a trench wall cutter with a drum-shaped hub, on the outer circumference of which tooth holders are arranged, in which cutting teeth for removing soil material are detachably held, the cutting teeth projecting radially outwards and having a tooth head with at least one first cutting element and a tooth base , according to the preamble of claim 1.

A cutting wheel of this type can be found, for example, in EP 2 685 007 A1. This known cutting wheel has ring-segment-like tooth mounts along several circumferential rows, which are attached to the drum-shaped hub in an axially offset manner with respect to one another. Each arcuate tooth holder has a large number of removal teeth, which have a different position in relation to one another. The individual removal teeth protrude to different extents from the tooth holder in order to cover the widest possible area of the in-situ soil with the cutting bodies on the individual removal teeth. In this way, good soil removal can be achieved.

In the case of the cutting wheel according to EP 2 685 007 A1, a total of six circumferential rows with tooth holders are provided, with a large number of teeth being arranged in each case. If a soil layer with cohesive soil, such as clay or loam, is processed with such a cutting wheel, the cohesive soil material can adhere to the curved tooth holders and accumulate in the spaces between the teeth. As a result, the cutting wheel is clogged overall, which reduces the removal rate significantly reduced during milling. In addition, a clogged milling wheel tends to run off, making it difficult to create a milling slot in a precise position.

It is known to provide clearing plates on the underside of the milling cutter frame for clearing the spaces between the tooth mounts, which engage in the spaces like a comb and strip adhering material from the tooth mounts. If the sticking soil material is mixed with rock material, there is a risk of damage to the tooth holders and the clearing plates.

EP 1 780 375 B1 discloses a milling tooth with a tooth root for receiving in a holder of a milling wheel and with a tooth head with a main cutting element. One or more reaming elements with pin-shaped cutting edges are arranged offset to the rear in the milling direction in the area of the tooth base, with which even harder soil geologies can be processed.

The invention is based on the object of specifying a cutting wheel for a trench wall cutter, with which efficient cutting is made possible even with different soil layers.

According to the invention, the object is achieved by a cutting wheel having the features of claim 1 . Preferred embodiments of the invention are given in the dependent claims.

The cutting wheel according to the invention is characterized in that at least one attachment tool oriented in the direction of rotation and having at least one second cutting element, which is arranged at a distance from the cutting tooth, is attached to a face of the at least one tooth holder oriented in the direction of rotation of the cutting wheel.

A basic idea of the invention lies in arranging an attachment tool in addition to the existing tooth holder on the face of the tooth holder directed in the direction of rotation. The front attachment tool is designed with at least one cutting element, so that hard material located between the clearing plates, in particular jammed rock, can be reliably removed, in particular broken or shattered, when passing through the comb-like clearing plates. By at least one attachment tool is the risk of Reduced damage to tooth holders and clearing plates. In addition, an improved and easier rotation of the cutting wheels can be achieved, in particular in the case of cohesive soil material which is mixed with rock material, such as pebbles. The second cutting element may include at least one cutting edge or cutting tip. The attachment tool is preferably designed as a breaking tool, a scoring tool and/or a cutting tool.

A preferred embodiment of the invention is that the attachment tool is welded to the end face of the tooth holder. This allows the attachment tool to be attached particularly easily and quickly. Welding on the attachment tool can also be regarded as a fundamentally detachable attachment, since the welded connection can be released relatively easily, for example with an angle grinder or a welding torch. Thus, even when the attachment tool is welded on, it is possible to replace worn attachment tools relatively easily and to attach a newly used attachment tool again by welding it on.

According to a further development of the invention, it is preferable for at least one receptacle to be arranged on the end face of the tooth holder, which receptacle is designed to receive and detachably hold the front tool with the second cutting element. The receptacle can be a sleeve-shaped cap for receiving a tooth or chisel shank, a receiving pocket or a U-shaped holder for inserting the second cutting element. In a pushed-in or picked-up position, it can be fixed, for example, by one or more locking bolts. These locking bolts can also be designed as so-called clamping sleeves, in particular a sleeve with a slot.

In principle, the second cutting element can be approximately at the radial height of the first cutting element. According to one embodiment of the invention, it is particularly advantageous that the second cutting element is arranged in front of the first cutting element in the direction of rotation and radially below the first cutting element or at the same radial height on the tooth holder. In particular, this allows stones that are stuck between the clearing plates to be broken up effectively, so that the tooth holder is particularly spared and protected. The radial arrangement refers to an axis of rotation of the cutting wheel, the second cutting element having a has a smaller radial distance to the axis of rotation of the cutting wheel than the first cutting element lying radially further outwards. The direction of rotation refers to the usual driving direction of rotation of the milling wheel around the axis of rotation.

According to one embodiment variant of the invention, it is preferred that the second cutting element is designed as a removal tooth with at least one cutting edge on the second cutting element. The cutting edge can be linear. The cutting edge allows targeted cutting or breaking of rock material directly in front of the tooth holder.

A further embodiment of the invention is that the second cutting element is designed as a point-shank chisel with a cutting tip on the second cutting element. The cutting tip is designed essentially in the form of a point, which is particularly suitable for breaking and smashing hard rock material. A pick is a version of a scoring tool.

A further advantageous embodiment of the invention consists in the fact that the attachment tool comprises an attachment strip which is detachably attached to an end face of the tooth holder. The front strip can preferably extend essentially along the entire front edge of the tooth holder. The attachment bar can be designed with receptacles for the second cutting element or even as a second cutting element.

According to a development of the invention, a particularly wear-resistant configuration is achieved in that at least one of the cutting elements has a hard material, in particular a hardened cutting steel, a sintered metal or a ceramic material. The at least one first cutting element and the at least one second cutting element are preferably formed with such a hard material. The hard material is harder and more wear-resistant than the tooth holder or other parts of the cutting wheel, which are made of conventional construction or machine steel. The at least one cutting element can be made entirely of the hard material or only partially made of it, in particular the part with the at least one cutting edge or the cutting tip. A foot or the shank of the at least one cutting element can be formed from a normal non-hardened steel material.

A particularly efficiently designed cutting wheel is achieved according to one embodiment of the invention in that at least two tooth holders are arranged directly next to one another and that at least one common attachment tool is arranged on the face of the at least two tooth holders. The two tooth holders arranged next to one another can preferably be in contact or at a small distance from one another, so that a double tooth holder or a multiple tooth holder is formed. This multiple tooth bracket has a correspondingly doubled or multiplied width at the front. With an upstream attachment tool, good rotation of the milling wheel can still be achieved despite the widened front. In addition, the attachment tool, especially if it is designed in the form of a strip, can cover a joint gap between the two or more particularly plate-shaped tooth holders arranged next to one another, so that such a tooth holder arrangement is particularly protected.

The invention also includes a milling device, which is characterized in that at least one milling wheel according to the invention is provided. The milling device preferably has two pairs of milling wheels which are rotatably mounted on an underside of a milling machine frame. Each pair of cutting wheels is arranged on a plate-shaped bearing plate, one cutting wheel with a coaxial axis of rotation being arranged on each side face of the plate-shaped bearing plate and being drivable in rotation. The milling device can be designed in particular as a trench wall cutter for forming a milled slot in the ground for a supporting or diaphragm wall. The milling device can be mounted so that it can be moved vertically via a carrier device by means of a carrying cable or a carrying rod. Milled soil material can be conveyed away from the milled trench and/or a support suspension and/or a hardenable mass can be fed into the milled trench via a corresponding conveying device.

A particularly advantageous embodiment of the invention is that clearing plates are arranged on the underside of a milling cutter frame, which protrude into the area of the tooth holders on the milling wheels and for clearing a Space between axially spaced tooth mounts are formed of adhering soil material, wherein rock material located between the clearing plates can be broken by the at least one breaking tool when the cutting wheel is rotating. The cutting wheel has a plurality of tooth mounts arranged on the circumference, which can be arranged in axially spaced rows of tooth mounts with respect to the axis of rotation. In the space between the rows of tooth mounts, the clearing plates, which are fixedly attached to the underside of the tiller frame of the milling device, can mesh so that the spaces are kept free of soil material. If rock material gets stuck or jammed between the comb-like clearing plates, this fixed rock material can be broken or shattered by the attachment tool mounted in front of the tooth holders when the cutting wheel is rotating, so that efficient cutting operation is ensured.

The invention is explained in more detail below on the basis of preferred exemplary embodiments, which are shown schematically in the drawings. In the drawings show:

1 shows a front view of a lower part of a trench wall cutter with a cutting wheel according to the invention;

FIG. 2 shows a side view of the lower part of a trench wall cutter with the cutting wheel according to FIG. 1;

3 shows a side view of a cutting wheel according to the invention;

FIG. 4 is a plan view of the cutting wheel of FIG. 3;

5 is a perspective view of the cutting wheel of FIGS. 3 and 4;

Fig. 6 is a side view of a cutter tooth holder in a first embodiment of the present invention;

Fig. 7 is a front view of the auger mount of Fig. 6;

Figure 8 is a top plan view of the auger tooth mount of Figures 6 and 7; 9 is a perspective view of the cutter tooth mount of FIGS. 6 through 8;

Fig. 10 is a side view of a cutter tooth holder in a second embodiment of the present invention;

Fig. 11 is a front view of the auger mount of Fig. 10;

12 shows a plan view from above of the cutting tooth holder according to FIGS. 10 and 11;

13 is a perspective view of the cutter tooth mount of FIGS. 10 through 12;

Fig. 14 is a side view of a cutter tooth holder in a third embodiment of the present invention;

Fig. 15 is a front view of the auger mount of Fig. 14;

Figure 16 is a top plan view of the auger tooth mount of Figures 14 and 15;

17 is a perspective view of the cutter tooth mount of FIGS. 14 through 16;

18 is a side view of a cutter tooth holder in a fourth embodiment of the present invention;

Fig. 19 is a front view of the auger mount of Fig. 18;

Figure 20 is a top plan view of the auger tooth mount of Figures 18 and 19; and

21 shows a perspective view of the cutting tooth holder according to FIGS. 18 to 20.

A trench wall cutter 10 according to the invention is shown schematically in FIGS. 1 and 2, only a lower part of a cutter frame 12 with only a single cutting wheel 30 being shown. Overall, however, there are 10 on the trench wall cutter Four cutting wheels 30 are arranged, two of which are mounted as a cutting wheel pair on both sides of a bearing plate 20 so as to be rotatable about a bearing axis 22 .

Between the two pairs of cutting wheels 30, a box-like suction nozzle 14 with a plurality of suction openings 16 for sucking off the milled soil material with the surrounding suspension is arranged on an underside of the milling machine frame 12. A suction pump (not shown) is mounted on a flange 18 shown in FIG. 1 for suction purposes. Clearing plates 26 can also be arranged on the underside of the milling cutter frame, which engage in spaces between the milling teeth 50 and the tooth holders 40 in order to scrape off adhering soil material.

The structure of a cutting wheel 30 according to the invention is explained below in connection with FIGS. The cutting wheel 30 has a drum-shaped hub 32, on the outer circumference of which tooth holders 40 with cutting teeth 50 are arranged in circumferential rows.

On an inner peripheral row, which is directed toward the bearing plate 20, pivot bearings 80 for folding teeth 70 can be arranged in addition to normal tooth mounts 40. On the outer circumferential row at the other end of the hub 32, individual tooth mounts 40 can be arranged at an angle of inclination with respect to a radially directed plane.

In the illustrated embodiment of a cutting wheel 30, two central circumferential rows with a preferably double arrangement of tooth holders 40 for receiving cutting teeth 50 with a preferably T-shaped tooth tip 60 are arranged between the inner circumferential row and the outer circumferential row. The tooth mounts 40 and the cutting teeth 50 will be explained in more detail below.

In the case of the cutting wheel 30 according to FIGS. 3 to 5, two double tooth holders 40 are arranged in the two middle circumferential rows, which are offset by 180° in the same circumferential row. To the first central circumferential row, the tooth mounts 40 are in turn offset by 90° to the second central circumferential row, so that there is a sufficient distance between the individual tooth mounts 40 in the adjacent circumferential rows. In the outer peripheral row, a total of four inclined tooth mounts 40 are arranged with an outward inclination. On the inner peripheral row, which is directed towards the bearing plate 20, two folding teeth 70 are arranged offset by 180° with respect to one another. Offset from this by 90°, two double tooth holders 40 are also arranged on the inner circumferential row, which are also offset by 180° to one another.

Attachments designed as crushing tools 90 with beveled deflecting elements, hereinafter referred to as attachment elements 46, are positioned in front of the double tooth holding arrangement, each with two plate-shaped tooth holders 40, which adjoin directly next to one another in the direction of rotation of the cutting wheel 30, in order to prevent soil material from penetrating into a joint between the two adjacent tooth holders 40 to avoid.

To accommodate milling teeth 50, U-shaped recesses 41 can be formed in the tooth holders 40, in which the milling teeth 50 are held directly or via a U-shaped insert 42. The plate-shaped tooth mounts 40 can thus be attached to the hub 32 of the cutting wheel 30 in a single arrangement as in the outer circumferential row or in a double arrangement as in the two middle circumferential rows.

A double arrangement of tooth holders 40 with an attachment tool 90 according to the invention is described in more detail below in connection with FIGS. A single tooth mount 40 is plate-shaped and has an arcuate edge on its underside for welding to the outer periphery of the hub 32 of a cutter wheel 30 . Furthermore, a U-shaped recess 41 is provided, into which a tooth base 52 of a milling tooth 50 can be radially inserted in a manner known in principle, forming a tongue and groove connection. For fastening, a fastening pin can be pushed transversely through a through-hole 53 in the tooth root 52 of the milling tooth 50, with which the milling tooth 50 used is fixed to the tooth holder 40 in a positive and non-positive manner. The fastening pin can in particular be designed as a slotted sleeve which is fixed in the through-hole 53 with a certain clamping force. To absorb particularly high forces, two plate-shaped tooth mounts 40 are preferably arranged directly next to one another. The two adjoining tooth holders 40 can also be easily detachably connected to one another via fastening screws or spot welds. In this double arrangement of two tooth holders 40, a single cutting tooth 50 with two corresponding tooth bases 52 or two individual cutting teeth 50, which can preferably also be welded together, can be used, each with a single tooth base 52, which together can form a complete tooth. A plurality of first cutting elements 66 for removing soil material are arranged on a tooth tip 60 of the cutting tooth 50 .

In the direction of rotation or in the milling direction of the milling wheel 30 , the double arrangement of tooth holders 40 is preceded by an attachment tool 90 with a strip-shaped attachment element 46 which is welded to the cutting wheel hub 32 and/or to the tooth holders 40 . The attachment element 46 of the attachment tool 90 prevents milled soil material from penetrating into the joint between the two adjacent tooth mounts 40, thereby increasing the stability of the double arrangement. Furthermore, the attachment element 46 can have one or more inclined deflection surfaces, with which soil material hitting the front is deflected laterally around the tooth holders 40 . As a result, the load on the tooth holders 40 is further reduced and a certain guidance of the milled soil material to the outside or to the suction openings 16 of the suction connection 14 of the trench wall cutter 10 can also be achieved.

A socket-like receptacle 92 can be attached, in particular welded, to an upper region of the strip-shaped attachment element 46 . A single second cutting element with a cutting edge 97 for forming a breaking tool 94 is held on a front side of the receptacle 92 pointing in the direction of rotation. The second cutting element is positioned in front of the first cutting element 66 in the direction of rotation of the cutting wheel 30 and is set radially inward with respect to the axis of rotation.

Another double arrangement of tooth holders 40 with an attachment tool 90 according to the invention is described in more detail below in connection with FIGS. The basic arrangement of tooth holder 40, cutting tooth 50 and attachment tool 90 corresponds to the arrangement according to the embodiment according to FIGS. 6 to 9. In a departure from this, a base-like receptacle 92 is attached to an upper area of the strip-shaped attachment element 46 . A breaking tool 94 with a single second cutting element with a cutting edge 97 is held on an upper side of the receptacle 92 pointing in the radial direction in relation to the axis of rotation. The second cutting element is positioned in front of the first cutting element 66 in the direction of rotation of the cutting wheel 30 and is set radially inward with respect to the axis of rotation.

A further arrangement with a tooth holder 40 with an attachment tool 90 according to the invention is described in more detail below in connection with FIGS. The basic arrangement of tooth holder 40, milling tooth 50 and attachment tool 90 corresponds to the arrangement according to the embodiment according to FIGS , In particular two, second cutting elements with cutting edge 97 are held. The second cutting elements lying next to one another are positioned in front of the first cutting element 66 in the direction of rotation of the cutting wheel 30 and are set radially inward with respect to the axis of rotation.

A further arrangement with a tooth holder 40 with an attachment tool 90 according to the invention is described in more detail below in connection with FIGS. The basic arrangement of tooth holder 40, milling tooth 50 and attachment tool 90 corresponds to the arrangement according to the embodiment according to FIGS. This receptacle 92 is designed for releasably receiving and holding a pick as the second cutting element with a cutting tip 98 . The cutting tip 98 is positioned in front of the first cutting element 66 in the direction of rotation of the cutting wheel 30 and is set radially inward with respect to the axis of rotation.

The milling tooth 50 has been removed in FIG. 21, so that the U-shaped recess 41 in the tooth holder 40 for the milling tooth 50 can be seen.

Claims

PATENT CLAIMS

1. Cutting wheel for a trench wall cutter (10) with a drum-shaped hub (32) on the outer circumference of which tooth holders (40) are arranged, in which cutting teeth (50) are detachably held for removing soil material, the cutting teeth (50) pointing radially outwards protrude and have a tooth tip (60) with at least one first cutting element (66) and a tooth root (52), characterized in that on a face of the at least one tooth holder (40) oriented in the direction of rotation of the cutting wheel (30) there is at least one tooth holder (40) oriented in the direction of rotation Attachment tool (90) is mounted with at least a second cutting element, which is spaced from the cutting tooth (50).

2. Milling wheel according to claim 1, characterized in that the attachment tool (90) is welded to the end face of the tooth holder (40).

3. Milling wheel according to claim 1, characterized in that at least one receptacle (92) is arranged on the end face of the tooth holder (40), which is designed to receive and releasably hold the attachment tool (90) with the second cutting element. Milling wheel according to one of Claims 1 to 3, characterized in that the second cutting element is arranged in the direction of rotation in front of the first cutting element (66) and radially below the first cutting element (66) or at the same height on the tooth holder (40). Cutting wheel according to one of Claims 1 to 4, characterized in that the second cutting element is designed as a cutting tooth with at least one cutting edge (97) on the second cutting element (96). Milling wheel according to one of Claims 1 to 4, characterized in that the second cutting element is designed as a point-shank chisel with a cutting tip (98) on the second cutting element (96). Milling wheel according to one of Claims 1 to 6, characterized in that the attachment tool (90) comprises an attachment strip (46) which is detachably attached to an end face of the tooth holder (40). Cutting wheel according to one of Claims 1 to 7, characterized in that at least one of the cutting elements (66) has a hard material, in particular a hardened cutting steel, a sintered metal or a ceramic material. Milling wheel according to one of Claims 1 to 8, characterized in that at least two tooth holders (40) are arranged directly next to one another and that at least one common attachment tool (90) is arranged on the end face of the at least two tooth holders (40). - 14- cutting wheel according to any one of claims 1 to 9, characterized in that the attachment tool (90) is designed as a breaking tool. Milling device, characterized in that at least one milling wheel (30) according to one of Claims 1 to 11 is arranged. Milling device according to Claim 11, characterized in that clearing plates are arranged on the underside of a milling machine frame (12), which protrude into the area of the tooth holders (40) on the milling wheels (30) and are used to clear a gap between axially spaced tooth holders (40). adhering soil material are formed, with rock material located between the clearing plates being breakable by the at least one attachment tool (90) when the cutting wheel (30) is rotating.