milling cutter

Abstract

The invention relates to a milling wheel (30) for a wall slotter (10), having a drum-shaped wheel hub (32), at the outer periphery of which tooth holders (40) are arranged, in which milling teeth (50) for removing earth material are held releasably, wherein the milling teeth (50) project radially outwards and have a tooth head (60) with at least one first cutting element (66) and a tooth root (52). According to the invention, at least one rotationally directed attachment tool (90) is arranged at the end side of the tooth holder (40) which points in the direction of rotation of the milling wheel (30), which has at least one second cutting element (97) which is arranged spaced apart from the corresponding milling tooth (50).

Description

Technical Field

[0001] The present invention relates to a milling wheel for a slotted wall milling machine, the milling wheel having a drum-shaped hub, a tooth holding portion arranged at the outer periphery of the hub, wherein milling teeth for removing soil material are detachably held in the tooth holding portion, wherein the milling teeth protrude radially outward and have a tooth head and tooth root with at least one first cutting element. Background Technology

[0002] For example, EP2685007A1 discloses a milling wheel of this type. This known milling wheel has annular segmented tooth holders arranged along multiple circumferential rows, these tooth holders being axially offset from each other at a drum-shaped hub. Each arc-shaped tooth holder has a large number of removal teeth, these removal teeth being positioned differently from each other. Each removal tooth protrudes to a different degree relative to the tooth holder, so that the cutting material at each removal tooth can cover as wide an area of ​​the land to be treated as possible. This allows for effective land removal.

[0003] The milling wheel according to EP2685007A1 has a total of six circumferential rows with tooth holders, each containing a large number of teeth. When such a milling wheel is used to process soil layers containing sticky materials, such as clay or terracotta, the sticky material can adhere to the curved tooth holders and accumulate in the spaces between the teeth. This generally clogs the milling wheel, significantly reducing removal performance during milling. Furthermore, a clogged milling wheel is more prone to deviation, making it difficult to accurately create the milling groove.

[0004] It is known that, in order to clear the hollow space between the tooth holders, a cleaning plate is provided on the underside of the milling machine frame. This cleaning plate engages in a comb-like manner with the intermediate space and scrapes off the adhering material from the tooth holders. If the adhering soil material is mixed with rock material, there is a risk of damage to the tooth holders and the cleaning plate.

[0005] A milling tooth is known from EP1780375B1. This milling tooth has a tooth root for reception in a retainer of a milling wheel and a tooth head with a main cutting element. One or more re-cutting elements with pin-shaped cutting portions are arranged rearwardly offset in the milling direction in the region of the tooth root, which can also be used to process harder soil geological conditions. Summary of the Invention

[0006] The objective of this invention is to provide a milling wheel for a slotted wall milling machine, which enables efficient milling even in different soil layers.

[0007] According to the present invention, the task is accomplished using a milling wheel according to the present invention. The present invention has several preferred embodiments.

[0008] The milling wheel according to the invention is characterized in that at least one accessory tool pointing in the rotation direction is disposed at an end side of at least one tooth holding portion pointing in the rotation direction of the milling wheel, the at least one accessory tool having at least one second cutting element, the second cutting element being arranged spaced apart from the milling teeth.

[0009] A fundamental concept of this invention is that, in addition to the existing tooth retainer, an attachment tool is arranged at the end side of the tooth retainer pointing in the direction of rotation. The forward attachment tool is configured with at least one cutting element, which reliably eliminates, in particular breaks or pulverizes, hard material, especially stuck rock, located between the comb-shaped clearing plates as it passes through them. Therefore, the risk of damage to the tooth retainer and the clearing plates is reduced by the at least one attachment tool. Furthermore, improved and easier rotation of the milling wheel is achieved, especially in the case of sticky soil materials mixed with rock materials (such as pebbles). The second cutting element may include at least one cutting edge or cutting tip. The attachment tool is preferably configured as a crushing tool, a chisel tool, and / or a cutting tool.

[0010] A preferred embodiment of the invention is that the accessory tool is welded to the end side of the tooth retainer. This allows for a particularly simple and quick fastening of the accessory tool. The welding of the accessory tool can also be considered a substantially detachable fastening, as the welded connection can be relatively easily detached, for example, using a separation grinder or welding torch. Therefore, even in the case of welded accessory tools, it is possible to relatively easily replace the worn accessory tool and re-fasten the re-inserted accessory tool by welding.

[0011] According to a preferred embodiment of the invention, at least one receiving portion is arranged at the end side of the tooth retainer, the receiving portion being configured to receive and detachably retain the accessory tool with the second cutting element. The receiving portion may be a sleeve-shaped cap for receiving the tooth shank or chisel shank, a receiving notch, or a U-shaped retainer for pushing in the second cutting element. In the pushed-in or received position, it may be secured, for example, by one or more locking pins. These locking pins may also be implemented as so-called clamping sleeves, especially sleeves with slots.

[0012] In principle, the second cutting element can be positioned approximately at the radial height of the first cutting element. A particularly advantageous aspect according to one embodiment of the invention is that the second cutting element is arranged in the tooth holder ahead of the first cutting element in the rotational direction and radially below or at the same radial height as the first cutting element in the tooth holder. This, in particular, allows for effective breaking of stones firmly stuck between the clearing plates, thereby particularly protecting and safeguarding the tooth holder. The radial arrangement relates to the axis of rotation of the milling wheel, wherein the second cutting element has a smaller radial distance from the axis of rotation of the milling wheel relative to the first cutting element, which is located further outward in the radial direction. The rotational direction relates to the usual driving rotation direction of the milling wheel about its axis of rotation.

[0013] According to a preferred embodiment of the invention, the second cutting element is configured as a removal tooth having at least one cutting edge located at the second cutting element. The cutting edge can be configured as a linear shape. The cutting edge allows for targeted cutting or crushing of rock material directly in front of the tooth holder.

[0014] Another aspect of the invention is that the second cutting element is constructed as a round-shank chisel with a cutting tip located at the second cutting element. The cutting tip is designed essentially in a point shape, and is particularly suitable for crushing and pulverizing hard rock materials. The round-shank chisel is one embodiment of a carving tool.

[0015] Another advantageous embodiment of the invention is that the accessory tool includes an accessory strip detachably mounted on the end side of the tooth retainer. The accessory strip preferably extends substantially along the entire front edge of the tooth retainer. The accessory strip may be configured to have a receiving portion for a second cutting element or may be configured itself as a second cutting element.

[0016] According to an improved embodiment of the invention, a particularly wear-resistant design is achieved by having at least one cutting element made of a hard material, particularly hardened cutting steel, sintered metal, or ceramic. Preferably, at least one first cutting element and at least one second cutting element are constructed using this hard material. The hard material here has greater hardness and wear resistance than the tooth holder or other parts of the milling wheel, which are made of common structural steel or machine steel. The at least one cutting element may be constructed entirely of the hard material, or only partially using the hard material, particularly the portion with the at least one cutting edge or cutting tip. The base or shank of the at least one cutting element may be constructed of ordinary, non-hardened steel.

[0017] According to one embodiment of the invention, a particularly efficient milling wheel is achieved by having at least two tooth holders arranged directly beside each other, and at least one common attachment tool arranged at the end sides of the at least two tooth holders. These two adjacent tooth holders are preferably in contact with each other or spaced slightly apart, thus forming a double or multiple tooth holder. Such a multiple tooth holder has a correspondingly double or multiple times the width at the front. Good rotatability of the milling wheel can still be achieved by the front attachment tool, despite the widening of the front side. Furthermore, the attachment tool, especially when it is constructed in a slat shape, can cover the engagement gap between the two or more adjacent, especially slat-shaped, tooth holders, thereby providing particular protection and safeguarding to this tooth holder assembly.

[0018] The invention also includes a milling apparatus characterized by having at least one milling wheel arranged according to the invention. The milling apparatus preferably has two pairs of milling wheels rotatably supported on the underside of a milling machine frame. Each pair of milling wheels is arranged at a plate-shaped bearing cap, wherein a milling wheel with a coaxial axis of rotation is arranged and rotatably driven on each side of the plate-shaped bearing cap. The milling apparatus can be particularly configured as a slotting wall milling machine for forming milling grooves in the ground for supporting walls or slotted walls. The milling apparatus can be vertically supported by a supporting device using a supporting rope or supporting rod. The milled ground material can be removed from the milling groove and / or supporting suspensions and / or hardenable materials can be supplied to the milling groove by a corresponding conveying device.

[0019] A particularly advantageous embodiment of the invention involves a clearing plate arranged on the underside of the milling machine frame. This clearing plate extends into the area of ​​the toothed retaining portion of the milling wheel and is configured to remove adhering soil material from the intermediate space between the axially spaced toothed retaining portions. During milling wheel rotation, rock material located between the clearing plates can be broken by at least one crushing tool. Here, the milling wheel has a plurality of toothed retaining portions arranged circumferentially, which are arranged in rows axially spaced relative to the axis of rotation. In the intermediate space between the rows of toothed retaining portions, the clearing plates, fixedly mounted on the underside of the milling machine frame, can engage in an meshing manner, thereby keeping the intermediate space free of soil material. If rock material is adhered to or stuck between the comb-like arranged clearing plates, this adhered rock material can be broken or crushed by an accessory tool positioned forward of the toothed retaining portion during milling wheel rotation, thereby ensuring efficient milling operation. Attached Figure Description

[0020] The invention will now be explained in more detail with the aid of preferred embodiments, which are schematically illustrated in the accompanying drawings. In the drawings: Figure 1 A front view of the lower portion of a slotted wall milling machine having a milling wheel according to the invention is shown; Figure 2 Showing the basis Figure 1 Side view of the lower part of a slotting wall milling machine with milling wheels; Figure 3 A side view of the milling wheel according to the invention is shown; Figure 4 Showing the Figure 3 A top view of the milling wheel; Figure 5 Show Figure 3 and Figure 4 Perspective view of the milling wheel; Figure 6 A side view of the milling tooth retainer according to a first embodiment of the present invention is shown; Figure 7 Show Figure 6 A front view of the milling tooth retainer; Figure 8 Showing from above according to Figure 6 and Figure 7 A top view of the milling tooth retainer; Figure 9 Showing according to Figures 6 to 8 A perspective view of the milling tooth retainer; Figure 10 A side view of the milling tooth retainer according to a second embodiment of the present invention is shown; Figure 11 Show Figure 10 A front view of the milling tooth retainer; Figure 12 Showing from above according to Figure 10 and Figure 11 A top view of the milling tooth retainer; Figure 13 Showing according to Figures 10 to 12 A perspective view of the milling tooth retainer; Figure 14 A side view of the milling tooth retainer according to a third embodiment of the present invention is shown; Figure 15 Show Figure 14 A front view of the milling tooth retainer; Figure 16 Showing from above according to Figure 14 and Figure 15 A top view of the milling tooth retainer; Figure 17 Showing according to Figures 14 to 16 A perspective view of the milling tooth retainer; Figure 18A side view of the milling tooth retainer according to a fourth embodiment of the present invention is shown; Figure 19 Show Figure 18 A front view of the milling tooth retainer; Figure 20 Showing the basis Figure 18 and Figure 19 A top view of the milling tooth retainer; and Figure 21 Showing according to Figures 18 to 20 A perspective view of the milling tooth retainer. Detailed Implementation

[0021] exist Figure 1 and Figure 2 The image schematically illustrates a slotted wall milling machine 10 according to the invention, wherein only the lower portion of the milling machine frame 12 is shown, which has only a single milling wheel 30. However, a total of four milling wheels 30 are arranged at the slotted wall milling machine 10, of which two milling wheels are rotatably supported as a pair on both sides of the bearing cover 20 around the bearing shaft 22.

[0022] Between the two pairs of milling wheels 30, a box-shaped suction pipe 14 with multiple suction openings 16 is arranged on the lower side of the milling machine frame 12 for sucking away the milled land material along with surrounding suspended matter. For suction, in... Figure 1 A suction pump (not shown) is installed at the flange 18 shown. Additionally, a cleaning plate 26 can be arranged on the underside of the milling machine frame, which engages in the intermediate space between the milling teeth 50 and the tooth holder 40 to scrape off adhering soil material.

[0023] The following is combined Figures 3 to 5 The structure of the milling wheel 30 according to the present invention is explained. The milling wheel 30 has a drum-shaped hub 32, and a tooth holding portion 40 with milling teeth 50 is arranged in a circumferential row on the outer periphery of the hub.

[0024] In the inner circumferential row pointing toward the bearing cap 20, in addition to the normal tooth retainer 40, a pivot bearing 80 for flipping the tooth 70 may be arranged. In the outer circumferential row at the other end of the hub 32, a single tooth retainer 40 may be arranged, which has an inclined angle relative to the radially pointing plane.

[0025] In the illustrated embodiment of the milling wheel 30, two intermediate circumferential rows are arranged between the inner and outer circumferential rows, the intermediate circumferential rows having a preferred dual arrangement of tooth retaining portions 40 for receiving milling teeth 50 with preferably T-shaped tooth tips 60. The tooth retaining portions 40 and the milling teeth 50 are explained in more detail below.

[0026] According to Figures 3 to 5 In the milling wheel 30, two double tooth holders 40 are arranged in two intermediate circumferential rows, which are offset by 180° in the same circumferential row. The tooth holders 40 are also offset by 90° relative to the first intermediate circumferential row, so that there is sufficient spacing between the tooth holders 40 in adjacent circumferential rows.

[0027] In the outer circumferential row, a total of four inclined tooth retaining portions 40 with outward tilting portions are arranged. In the inner circumferential row pointing toward the bearing cover 20, two flipping teeth 70 are arranged offset from each other by 180°. In addition, offset by 90°, two double tooth retaining portions 40 are also arranged in the inner circumferential row, which are also offset from each other by 180°.

[0028] In the rotation direction of the milling wheel 30, before the double tooth holding arrangement structure having two plate-shaped tooth holding portions 40 that are directly adjacent to each other, an attachment tool with an inclined repulsion element (hereinafter referred to as attachment element 46) is provided for the breaking tool 90, so as to prevent soil material from entering the joint between the two adjacent tooth holding portions 40.

[0029] To accommodate the milling teeth 50, U-shaped openings 41 can be constructed in the tooth holding portion 40. The milling teeth 50 are held directly or through the U-shaped inserts 42 in the openings and introduced into the openings. Therefore, the plate-shaped tooth holding portion 40 can be arranged at the hub 32 of the milling wheel 30 in a single arrangement as in the outer circumferential row or in a double arrangement as in the two intermediate circumferential rows.

[0030] The following text combines Figures 6 to 9 The dual arrangement of the tooth retainer 40 with the accessory tool 90 according to the invention will be described in more detail. Each tooth retainer 40 is plate-shaped and has an arcuate edge on its underside for welding to the outer periphery of the hub 32 of the milling wheel 30. Furthermore, a U-shaped recess 41 is provided into which the tooth root 52 of the milling tooth 50 can be radially inserted in a generally known manner when a tenon joint is constructed. For fastening, a fastening pin can be laterally pushed into a through-hole 53 passing through the tooth root 52 of the milling tooth 50, and the inserted milling tooth 50 is fixed to the tooth retainer 40 by the form-fit and force-fit of the fastening pin. The fastening pin can in particular be constructed as a slotted sleeve, which is fixed in the through-hole 53 with a certain tension.

[0031] To receive particularly high forces, it is preferable that two plate-shaped tooth retainers 40 are arranged directly beside each other. Additionally, these two adjacent tooth retainers 40 can also be easily detached from each other by fastening threads or welds. In this dual arrangement of the two tooth retainers 40, a single milling tooth 50 with two corresponding tooth roots 52 or two single milling teeth 50 each with a single tooth root 52 can be inserted, which can together form a single tooth. A plurality of first cutting elements 66 for removing soil material are arranged at the tooth head 60 of the milling tooth 50.

[0032] In the rotational or milling direction of the milling wheel 30, an attachment tool 90 with a slat-shaped attachment element 46 is connected before the double arrangement of the tooth holder 40. This attachment element is welded to the milling wheel hub 32 and / or the tooth holder 40. The attachment element 46 of the attachment tool 90 prevents the milled soil material from intruding into the joint between two adjacent tooth holders 40, thereby improving the stability of the double arrangement. Furthermore, the attachment element 46 may have one or more inclined repulsive surfaces, which deflect the soil material encountered face-to-face laterally around the tooth holder 40. This further reduces the load on the tooth holder 40 and also allows for some outward guidance of the milled soil material or some guidance to the suction opening 16 of the suction pipe 14 of the slotted wall milling machine 10.

[0033] A socket-type receiving portion 92 may be mounted, in particular welded, on the upper region of the strip-shaped accessory element 46. A single second cutting element with a cutting edge 97 is held on the front side of the receiving portion 92 in the direction of rotation for forming a crushing tool 94. The second cutting element is positioned forward of the first cutting element 66 in the direction of rotation of the milling wheel 30 and is arranged radially inward relative to the axis of rotation.

[0034] The following is combined Figures 10 to 13 A further dual arrangement of the tooth retainer 40 with the accessory tool 90 according to the invention is described in more detail. The basic arrangement of the tooth retainer 40, the milling tooth 50, and the accessory tool 90 corresponds to that according to the invention... Figures 6 to 9 The arrangement structure of this embodiment is different. A socket-like receiving portion 92 is provided in the upper region of the strip-shaped accessory element 46. A crushing tool 94 with a single second cutting element having a cutting edge 97 is held on the upper side of the receiving portion 92, pointing radially relative to the axis of rotation. The second cutting element is positioned forward of the first cutting element 66 in the rotational direction of the milling wheel 30 and is arranged radially inward relative to the axis of rotation.

[0035] The following is combined Figures 14 to 17A further arrangement of the tooth retainer 40 with the accessory tool 90 according to the invention is described in more detail. The basic arrangement of the tooth retainer 40, the milling teeth 50, and the accessory tool 90 corresponds to that according to the invention... Figures 10 to 13 The arrangement structure of the embodiment is different. In this case, a plurality of, especially two, second cutting elements with cutting edges 97 are held at the upper side of the socket-shaped receiving part 92 in the radial direction relative to the axis of rotation. The second cutting elements, which are arranged side by side, are positioned in front of the first cutting element 66 in the rotation direction of the milling wheel 30 and are arranged radially inward relative to the axis of rotation.

[0036] The following is combined Figures 18 to 21 A further arrangement of the tooth retainer 40 with the attachment tool 90 according to the invention is described in more detail. The basic arrangement of the tooth retainer 40, the milling teeth 50, and the attachment tool 90 corresponds to that according to the invention... Figures 10 to 13 The arrangement structure of the embodiment is different. In contrast, a sleeve-shaped or cap-shaped receiving portion 92 is provided at the accessory element 46. The receiving portion 92 is configured to receive and hold the round shank chisel, which is a second cutting element with a cutting tip 98. The cutting tip 98 is positioned forward of the first cutting element 66 in the rotation direction of the milling wheel 30 and is arranged radially inward relative to the axis of rotation.

[0037] exist Figure 21 In the middle, the milling tooth 50 is removed, so that the U-shaped empty part 41 for the milling tooth 50 in the tooth holding part 40 can be seen.

Claims

1. A milling wheel for a grooving wall milling machine (10), the milling wheel having a drum-shaped hub (32) with a tooth retaining portion (40) arranged at the outer periphery of the hub, wherein milling teeth (50) for removing soil material are detachably retained in the tooth retaining portion. in, The milling tooth (50) protrudes radially outward and has a tooth head (60) and a tooth root (52) with at least one first cutting element (66). The feature is that at least one attachment tool (90) pointing in the rotation direction is disposed at the end side of at least one tooth holding portion (40) pointing in the rotation direction of the milling wheel (30), the attachment tool having at least one second cutting element, the second cutting element being arranged spaced apart from the milling tooth (50) for removing hard material located between the cleaning plates, wherein the cleaning plates extend into the area of ​​the tooth holding portion (40).

2. The milling wheel according to claim 1, characterized in that, The accessory tool (90) is welded to the end side of the tooth retainer (40).

3. The milling wheel according to claim 1, characterized in that, At least one receiving portion (92) is arranged at the end side of the tooth retaining portion (40), the at least one receiving portion being configured to receive and detachably retain the accessory tool (90) with the second cutting element.

4. The milling wheel according to any one of claims 1 to 3, characterized in that, The second cutting element is arranged in the tooth holding portion (40) in the rotational direction ahead of the first cutting element (66) and in the tooth holding portion (40) in the radial direction below the first cutting element (66) or at the same height.

5. The milling wheel according to any one of claims 1 to 3, characterized in that, The second cutting element is configured to remove teeth, the removing teeth having at least one cutting edge (97) located at the second cutting element (96).

6. The milling wheel according to any one of claims 1 to 3, characterized in that, The second cutting element is constructed as a round shank chisel with a cutting tip (98) located at the second cutting element (96).

7. The milling wheel according to any one of claims 1 to 3, characterized in that, The accessory tool (90) includes an accessory strip (46) which is detachably mounted on the end side of the tooth retainer (40).

8. The milling wheel according to any one of claims 1 to 3, characterized in that, The at least one first cutting element (66) and / or the at least one second cutting element are made of hard material.

9. The milling wheel according to any one of claims 1 to 3, characterized in that, The at least one first cutting element (66) and / or the at least one second cutting element are made of hardened cutting steel, sintered metal or ceramic material.

10. The milling wheel according to any one of claims 1 to 3, characterized in that, At least two tooth retainers (40) are arranged directly next to each other, and At least one common accessory tool (90) is arranged at the end side of the at least two tooth retaining portions (40).

11. The milling wheel according to any one of claims 1 to 3, characterized in that, The accessory tool (90) is constructed as a crushing tool.

12. A milling machine, characterized in that, It is provided with at least one milling wheel (30) according to any one of claims 1 to 11.

13. The milling equipment according to claim 12, characterized in that, A clearing plate is arranged on the underside of the milling machine frame (12), the clearing plate extending into the area of ​​the tooth holder (40) at the milling wheel (30) and configured to remove adhering soil material from the intermediate space between the axially spaced tooth holders (40), wherein, when the milling wheel (30) rotates, the rock material located between the clearing plates can be broken by at least one accessory tool (90).

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