Mill cylinder for a floor milling machine and floor milling machine

Abstract

The rotary grinder (1) has a hollow cylindrical binding band (2), where multiple milling chisels (3,5a) are arranged on the outer circumferential surface of the binding band. A frontal milling chisel is arranged on the binding band in the area of front side. The milling chisel is provided for cutting the collision area between the front side and the ground material to be machined. An independent claim is also included for a ground milling machine with an operator stand.

Description

[0001] The invention relates to a milling drum according to the type specified by the preamble of claim 1. The invention further relates to a soil milling machine with at least one such milling drum.

[0002] Milling drums of this type are used to crush and / or remove soil material, especially compacted or solid soil material, such as concrete or tarmac. Such milling drums are often used to remove or partially remove road surfaces (or similar surfaces). Such milling drums are known, for example, from DE 698 24 340 T2, US Pat. No. 5,775,781 B, and DE 296 13 658 U.

[0003] A disadvantage of the milling drums of the type in question known from the prior art is that they are subject to severe wear during milling operation, particularly on the front sides of the drum base (also known as the drum). Particularly when cornering with a relatively small curve radii (e.g. milling manhole covers), severe abrasion occurs on the inside face of the drum due to the milling edge formed in the soil material. This abrasion is intensified by an undercut (so-called undercut) in the soil material relative to the milling edge. Currently, attempts are being made to protect the front sides of the drum from excessive wear by attaching wear plates. However, this is only partially satisfactory. A further disadvantage of the milling drums of the type in question known from the prior art is that more milled material adheres to the milling drum housing.

[0004] The invention is therefore based on the object of further developing a milling drum of the type in question in such a way that the frontal wear on the drum is reduced.

[0005] This object is achieved according to the invention in a milling drum of the type in question by the features of claim 1. According to this, it is provided, among other things, that two front-end milling chisels are arranged on the hollow-cylindrical drum in the region of at least one front side, which project beyond this front side and are intended to at least partially cut free the collision area between this front side and the soil material to be processed during milling operation.

[0006] The milling drum according to the invention comprises a hollow-cylindrical and axially extending drum base body, the so-called drum, which is defined with respect to its longitudinal axis by an inner drum radius and an outer drum radius. A plurality of milling cutters for crushing and / or removing soil material are arranged on the outer circumferential surface or the lateral surface of the hollow-cylindrical drum. Furthermore, according to the invention, two front-end milling cutters are arranged in the region of at least one annular end face of the hollow-cylindrical drum, which protrude from the respective end face or project outwards from this end face and which, during milling operation, protect the respective end face from direct abrasive contact with the soil material to be milled, in that the contact area or collision area between this end face of the hollow-cylindrical drum and the soil material is, so to speak, cleared orDepending on the arrangement and design of such front-end milling cutters, this protects the relevant end face of the hollow cylindrical drum at least partially from abrasion, thereby preventing or at least significantly reducing excessive wear on the relevant end face, as well as on any cutter holders and weld seams on the relevant end face.

[0007] An essential aspect of the invention is the direct protection of the relevant end face of the hollow cylindrical drum by two front-face milling tools, which is why the milling drum according to the invention is particularly suitable for cornering with a relatively small curve radius (e.g. milling free of manhole covers), despite the undercut on the milling edge.

[0008] According to a preferred development, the two front-side milling cutters are arranged distributed at equal intervals in a circumferential direction.

[0009] The longitudinal axis of the hollow cylindrical drum corresponds to the rotation axis. Radial distance refers to the effective distance of a front-end milling cutter, i.e., the distance of the milling tip or the effective point of the milling cutter from the longitudinal axis or the rotation axis, which corresponds to a specific cutting circle. Due to the varying radial distance of the front-end milling cutters, they move along different circumferential paths during milling, creating different cutting circles. This can be particularly advantageous for thicker hollow cylindrical drums. The drum thickness is the radial distance between the inner and outer radius of the drum.

[0010] According to the invention, the first front-end milling cutter is arranged on at least one end face of the hollow cylindrical drum in the radial direction (relative to the longitudinal axis or the rotational axis of the hollow cylindrical drum) approximately centrally between the drum inner radius and the drum outer radius, or between the inner circumferential surface and the outer circumferential surface of the hollow cylindrical drum. The cutting circle created by this front-end milling cutter is located approximately centrally on the circular end face of the hollow cylindrical drum.

[0011] According to the invention, the second front-end milling cutter protrudes radially outward on the end face of the hollow-cylindrical bandage (relative to the longitudinal axis or the rotational axis of the hollow-cylindrical bandage) beyond the outer radius of the bandage or beyond the outer circumferential surface. This radial projection provides even better protection for the respective end face against abrasion. According to the invention, the radial projection is in the range of 5 to 15 mm and is in particular approximately 10 mm. This information refers to the effective distance caused by the milling tip of the front-end milling cutter.

[0012] According to a preferred development, at least one of the front-end milling tools is arranged at an angle of attack on at least one end face of the hollow-cylindrical drum. The angle of attack can be defined, for example, as the angle of inclination of the milling tool's longitudinal axis with respect to a circumferential direction or direction of rotation of the hollow-cylindrical drum during milling operation.

[0013] According to the invention, the two front-end milling cutters are arranged directly in the front end of the hollow cylindrical drum at the respective front end. For this purpose, the hollow cylindrical drum is designed accordingly at the respective front end and has pockets, as explained in more detail below in connection with the figures.

[0014] According to the invention, the two front-end milling cutters arranged on the front side of the hollow-cylindrical drum are designed as replaceable milling cutters. For this purpose, cutter change holders are arranged on the hollow-cylindrical drum, to which the replaceable front-end milling cutters are attached.

[0015] According to a preferred embodiment, the axial longitudinal extent of the milling drum is greater than the (maximum) diameter of this milling drum. Preferably, the axial longitudinal extent is several times greater.

[0016] According to another preferred embodiment, the axial longitudinal extension of the milling drum is smaller than the (maximum) diameter of this milling drum. Such a milling drum can also be referred to as a milling rotor.

[0017] The solution to the problem also extends to a ground milling machine with a driver's platform (large milling machine) comprising at least one milling drum according to the invention. This is, in particular, a road milling machine.

[0018] The solution to the problem also extends to a hand-held ground milling machine (compact milling machine) comprising at least one milling drum according to the invention. This is, in particular, a road milling machine.

[0019] The invention is described in more detail below using the figures as examples. They show: Fig. 1 the front side area of ​​a milling drum according to the invention in a side view; Fig. 2 a perspective partial view of the left front side of the milling drum from the Fig. 1 , according to the Fig. 1 specified viewing direction (A); Fig. 3 a top view of the left front side of the milling drum from the Fig. 1 , according to the Fig. 1 specified viewing direction (A); and Fig. 4 a perspective view of the left front side of the milling drum from the Fig. 1 .

[0020] Fig. 1 shows a milling drum according to the invention, designated overall by 1. The milling drum 1 includes a drum base body designed as a hollow cylindrical drum 2, on whose outer circumferential surface or lateral surface 22 a plurality of milling bits 3 and 4 are arranged for crushing and / or removing soil material. The milling bits 3 and 4 are, for example, replaceable milling bits that are attached to the drum 2 by means of bit change holders 31 and 41. The bit change holders 31 and 41 are in turn welded, for example, to the drum 2. The longitudinal axis of the milling drum 1 and the drum 2 is indicated by L. The longitudinal axis L coincides with the axis of rotation. The direction of rotation (or direction of revolution or milling direction) of the milling drum 1 for milling operation is indicated by D. The milling cutters 3 are aligned with their milling cutter longitudinal axes essentially in the direction of rotation D, for example.Alternatively, the milling cutters 3 can also be angled relative to the direction of rotation D. The left end face of the drum 2 is designated by 21. The angled milling cutters 4, which extend beyond the end face 21, serve to create a defined milling edge in the soil to be processed. However, these milling cutters 4 cannot provide any protection for the end face 21.

[0021] To protect the front side 21 of the drum 2 during milling operation, two front-side milling tools 5a and 5b are arranged in the front area. Fig. 1 In the illustration shown, only the front-end milling cutter 5a is visible. The front-end milling cutters 5a and 5b project beyond the left front face 21 by a defined amount x (e.g., several millimeters) and are intended to at least partially cut or clear the collision area between this front face 21 and the soil material to be machined during milling operation, in order to essentially avoid direct contact between the front face 21 and the soil material remaining during milling. Fig. 2 The relevant collision area on the front side 21 is indicated as the radial section T (essentially corresponding to the thickness of the drum 2). Depending on the design, the front-end milling cutters 5a and 5b can cut an area that exceeds this radial section T radially inward and / or radially outward.

[0022] The front-side milling cutters 5a and 5b are also designed as replaceable milling cutters, which are attached to the drum 2 by means of cutter change holders 51. The cutter change holders 51 are arranged in pockets 6a and 6b, as described below in connection with the Fig. 4 explained in more detail. The front-side milling cutters 5a and 5b are angled at an angle of attack β relative to the direction of rotation D or are inclined outwards relative to the plane of the left front side 21, as can be clearly seen from the illustration of the Fig. 1 The angle of attack β can be the same or different for both front-end milling tools 5a and 5b. For milling drums with a large diameter or for milling drums with thick drums, more than two front-end milling tools may be required to clear the collision area.

[0023] Fig. 3 shows a plan view of the left end face 21 of the milling drum 1, according to the Fig. 1 Viewing direction indicated by A. This illustration clearly shows the circular cross-section of the drum 2. The drum 2 is defined by an inner circumferential surface with a drum inner radius Ri and an outer circumferential surface 22 with a drum outer radius Ra. Furthermore, (at least) one drive pulley 7 is present, which connects the drum 2 to a rotary drive and / or to a suspension.

[0024] In Fig. 3 K3 designates an outer milling or cutting circle, which is generated during milling operation by the milling bits 3 arranged on the outer circumferential surface 22 of the drum 2. K4 designates a lateral milling or cutting circle, which is generated during milling operation by the milling bits 4, which are slightly inclined outward with respect to the left end face 21, which is intended to result in a clean milling edge in the soil material.

[0025] However, the front side 21 of the drum 2 cannot be protected from abrasion with the milling cutters 4. The front-side milling cutters 5a and 5b are provided for this purpose. As can be seen from the illustration of the Fig. 3 As can be seen, the front-side milling cutters 5a and 5b are arranged offset by approximately 180° in the front area of ​​the drum 2.

[0026] K5b denotes the milling or cutting circle of the front-end milling tool 5b, which lies a few millimeters radially outside the outer circumferential surface 22 of the drum 2. K5a denotes the milling or cutting circle of the other front-end milling tool 5a, which is located approximately centrally between the inner circumferential surface and the outer circumferential surface 22 of the drum 2. Similarly, another front-end milling tool could also be arranged such that the milling or cutting circle Kx resulting during milling operation is located radially inside the inner circumferential surface of the drum 2. The milling tips and thus the points of action of the front-side milling tools 5a and 5b are thus located at different radial distances from the longitudinal axis or rotation axis L. The front-side milling tools 5a and 5b protect the relevant left-hand end face 21 of the drum 2 from abrasion during milling operation, thereby preventing excessive wear on this end face and on any tool holders orTool change holders 31 and 41 as well as weld seams in the area of ​​this front side 21 are avoided or at least significantly reduced. Preferably, corresponding front-side milling tools are also provided on the other front side of the milling drum 1.

[0027] As can also be seen very clearly from the Fig. 3 As can be seen, the milling cutters 3 and 4 are inclined with respect to a radial direction r, wherein the laterally outwardly inclined milling cutters 4 are inclined more sharply than the milling cutters 3 and wherein the milling tips each point in the direction of rotation U and in the circumferential direction u. The front-side milling cutters 5a and 5b are essentially maximally inclined with respect to the radial direction r and, in the illustration shown, have an approximately tangential orientation with respect to the drum 2, wherein the milling tips point in the circumferential direction u.

[0028] In the Fig. 4From the illustration shown, it is clearly visible that the front-end milling bit 5a, together with its associated bit change holder 51, is arranged directly in the drum 2. For this purpose, a corresponding pocket or recess 6a is machined into the drum 2, into which the bit change holder 51 is welded, for example. The same applies to the second front-end milling bit 5b, although here the pocket 6b does not penetrate the entire thickness of the drum 2.

Claims

1. A milling drum (1) for a ground milling machine for breaking up and / or removing a ground material, comprising a hollow-cylindrical drum (2) extending in an axially longitudinal direction, on the outer circumferential surface (22) of which several exchangeable milling tools (3, 4) are arranged for breaking up and / or removing the ground material, which are fastened to the drum (2) by means of interchangeable tool holders (31, 41), wherein on the hollow-cylindrical drum (2) two face-side milling tool (5a, 5b) protrude (x) beyond this face side (21) in the area of at least one face side (21) of the hollow-cylindrical drum (2), wherein the two face-side milling tools (5a, 5b) are each arranged directly in the drum (1) on the relevant face side (21) in a pocket (6a, 6b) and are provided to at least partially cut away the collision region (T) between said face side (21) and the ground material to be processed during milling operation, wherein the two face-side milling tools (5a and 5b) are also arranged as exchangeable milling tools which are fastened to the drum (2) by means of interchangeable tool holders (51), wherein the first of the two face-side milling tools (5a, 5b) is arranged in the radial direction (r) approximately in the middle between the inner circumferential surface and the outer circumferential surface (22) of the hollow-cylindrical drum (2), wherein the cutting circle (K5a) traced by this face-side milling tool is approximately in the middle of the ringshaped face side of the hollow-cylindrical drum (2), characterized in that the first face-side milling tool (5a) is arranged directly in the drum (2) together with its associated interchangeable tool holder (51), for which purpose a corresponding pocket (6a) is incorporated in the drum (2), in which the interchangeable tool holder (51) is welded, that the second of the two face-side milling tools (5b) is arranged directly in the drum (2) together with its associated interchangeable tool holder (51), for which purpose a corresponding pocket (6a) is incorporated in the drum (2), in which the interchangeable tool holder (51) is welded, wherein this pocket (6b) does not penetrate the entire thickness of the drum (2), and wherein the cutting circle (K5b) generated by this second face-side milling tool (5b) is arranged 5 to 15 millimeters radially outside of the outside circumferential surface (22) of drum (2).

2. A ground milling machine with an operating platform or a manually controlled ground milling machine, comprising at least one milling drum (1) according to the preceding claims.

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