CA2904147C - Bucket wheel for removing materials from a material composite, particularly of high hardness - Google Patents
Bucket wheel for removing materials from a material composite, particularly of high hardness Download PDFInfo
- Publication number
- CA2904147C CA2904147C CA2904147A CA2904147A CA2904147C CA 2904147 C CA2904147 C CA 2904147C CA 2904147 A CA2904147 A CA 2904147A CA 2904147 A CA2904147 A CA 2904147A CA 2904147 C CA2904147 C CA 2904147C
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- Prior art keywords
- bucket
- cutters
- wheel
- cutting teeth
- cutter
- Prior art date
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- 239000000463 material Substances 0.000 title claims abstract description 66
- 239000002131 composite material Substances 0.000 title claims abstract description 29
- 230000036346 tooth eruption Effects 0.000 claims abstract description 89
- 238000000034 method Methods 0.000 claims description 8
- 230000000737 periodic effect Effects 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 2
- 239000011257 shell material Substances 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 239000000969 carrier Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- -1 chalk Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000003077 lignite Substances 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910021646 siderite Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
- E02F9/2866—Small metalwork for digging elements, e.g. teeth scraper bits for rotating digging elements
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/18—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels
- E02F3/22—Component parts
- E02F3/24—Digging wheels; Digging elements of wheels; Drives for wheels
- E02F3/241—Digging wheels; Digging elements of wheels; Drives for wheels digging wheels
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/18—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels
- E02F3/22—Component parts
- E02F3/24—Digging wheels; Digging elements of wheels; Drives for wheels
- E02F3/248—Cleaning the wheels or emptying the digging elements mounted on the wheels, e.g. in combination with spoil removing equipment
Abstract
The present invention relates to a bucket wheel (1) for removing materials from a material composite (25), particularly of high hardness, comprising a main body (10), which extends around a bucket wheel rotational axis (11) and on which a plurality of buckets (12) having bucket cutters (13) are accommodated, said buckets being distributed on the circumference of the main body, wherein a plurality of cutting teeth (14) are arranged on each bucket cutter (13), the cutting teeth being movable on respective circular orbits (15, 16) by rotation of the main body (10) about the bucket wheel rotational axis (11). According to the invention, the cutting teeth (14) that are accommodated on adjacent bucket cutters (13) are arranged offset from one another, at least in part, such that the cutting teeth are movable on circular orbits (15, 16) offset in the direction of the bucket wheel rotational axis (11).
Description
Bucket wheel for removing materials from a material composite, particularly of high hardness Description The present invention relates to a bucket wheel for removing materials from a material composite, particularly of high hardness, having a base body which extends about a bucket wheel rotational axis and on which, distributed about the circumference a plurality of buckets with bucket cutters are accommodated, and wherein a plurality of cutting teeth, which can be moved on respective orbits about the bucket wheel rotational axis by rotation of the base body, are arranged on each bucket cutter. The invention is also directed at a bucket for a bucket wheel and at a method for removing materials with such a bucket wheel.
PRIOR ART
Bucket wheels are used, in particular, for bucket wheel excavators, and bucket wheel excavators are generally used in surface mining for removing and transporting away large quantities of materials. In this context, the material is released from a material composite, and the material composite can be, for example, a strata formation or else an artificially produced heap. Hard materials have compressive strengths of more than 5.0 MPa here, with the result that bucket wheels have to be embodied in a particular way in order to be compatible with the relatively high hardness of the material composite.
The bucket wheel is made to rotate about its bucket wheel rotational axis by a drive of the bucket wheel excavator, and the material which is to be removed, such as brown coal, chalk, limestone and the like, is released from the material composite
PRIOR ART
Bucket wheels are used, in particular, for bucket wheel excavators, and bucket wheel excavators are generally used in surface mining for removing and transporting away large quantities of materials. In this context, the material is released from a material composite, and the material composite can be, for example, a strata formation or else an artificially produced heap. Hard materials have compressive strengths of more than 5.0 MPa here, with the result that bucket wheels have to be embodied in a particular way in order to be compatible with the relatively high hardness of the material composite.
The bucket wheel is made to rotate about its bucket wheel rotational axis by a drive of the bucket wheel excavator, and the material which is to be removed, such as brown coal, chalk, limestone and the like, is released from the material composite
- 2 -by the rotating bucket wheel and lifted vertically in buckets, in order to subsequently pass onto a transportation belt for onward transportation. Hard materials for removal are, for example, hard brown coal, hard coal, marl or the like. The bucket wheel has, as a load-bearing base structure, a base body which rotates about the bucket wheel rotational axis, which runs approximately horizontally with respect to the overburden slope of the strata formation, and the bucket wheel is pivoted laterally by the bucket wheel excavator in order to generate advancing approximately in the direction of the bucket wheel rotational axis. For this purpose, the bucket wheel excavator has a superstructure, and the pivoting can be carried out by rotating on a caterpillar track unit, but there is also the possibility of the bucket wheel being moved relative to the strata formation by moving the bucket wheel excavator by means of the caterpillar track unit.
A plurality of buckets which have bucket cutters with a plurality of cutting teeth are arranged on the approximately cylindrical base body. In this context, each bucket is frequently assigned a main bucket cutter and one or more so-called pre-cutters, and the material released from the material composite by the cutting teeth passes into the bucket and subsequently onto the transportation belt of the bucket wheel excavator.
For example, DE 10 2004 033 934 Al presents a bucket wheel for removing materials from a material composite, and the bucket wheel is operated with a bucket wheel excavator for cutting below grade underneath its supporting surface. A plurality of buckets are arranged on the base body of the bucket wheel, and the buckets have approximately triangular or trapezoidal bucket cutters on which a plurality of cutting teeth are arranged. As a result of the lateral pivoting of the jib of the bucket wheel excavator, a side section of the bucket cutter always enters
A plurality of buckets which have bucket cutters with a plurality of cutting teeth are arranged on the approximately cylindrical base body. In this context, each bucket is frequently assigned a main bucket cutter and one or more so-called pre-cutters, and the material released from the material composite by the cutting teeth passes into the bucket and subsequently onto the transportation belt of the bucket wheel excavator.
For example, DE 10 2004 033 934 Al presents a bucket wheel for removing materials from a material composite, and the bucket wheel is operated with a bucket wheel excavator for cutting below grade underneath its supporting surface. A plurality of buckets are arranged on the base body of the bucket wheel, and the buckets have approximately triangular or trapezoidal bucket cutters on which a plurality of cutting teeth are arranged. As a result of the lateral pivoting of the jib of the bucket wheel excavator, a side section of the bucket cutter always enters
- 3 -into engagement with the material composite, with the result that either a left-hand or right-hand side section, which is referred to as a segment enters into engagement with the material composite depending on the pivoting direction of the jib of the bucket wheel excavator.
Either radially extending cells or annular spaces are provided in the base body of the bucket wheel corresponding to the number of buckets attached to the bucket wheel, the excavated mass of material being able to escape into said cells or annular spaces when the bucket is lifted, in order to avoid impeding the digging process. In order to avoid putting the emptying of the cells or annular spaces at risk, in particular in the case of sticky materials, an excessively high number of cells or annular spaces on the base body is not desired. In the case of small bucket wheels in the range between 4 m and 5 m diameter, the number of annular spaces can be limited to approximately 10 to 15, and in the case of large bucket wheels with 15 m to 20 m diameter, this number can be limited to approximately 20 to 25.
In addition to the triangular or trapezoidal bucket cutters which are shown, buckets are known with a U-shaped bucket frame which is attached to the base body to the left and right of the cell spaces or annular spaces using bolts and wedges on the base body, wherein each bucket has at least one bucket back for holding material and a bucket cutter on which the cutting teeth are generally attached.
The side sections of the bucket cutters have a steep attitude angle with respect to the bucket wheel rotational axis. This attitude angle relates to the lower part of the side sections, which are just still actively involved in the digging process.
In the known designs of bucket wheels, this angle is typically above 602. As a result, a relatively steep angle can be
Either radially extending cells or annular spaces are provided in the base body of the bucket wheel corresponding to the number of buckets attached to the bucket wheel, the excavated mass of material being able to escape into said cells or annular spaces when the bucket is lifted, in order to avoid impeding the digging process. In order to avoid putting the emptying of the cells or annular spaces at risk, in particular in the case of sticky materials, an excessively high number of cells or annular spaces on the base body is not desired. In the case of small bucket wheels in the range between 4 m and 5 m diameter, the number of annular spaces can be limited to approximately 10 to 15, and in the case of large bucket wheels with 15 m to 20 m diameter, this number can be limited to approximately 20 to 25.
In addition to the triangular or trapezoidal bucket cutters which are shown, buckets are known with a U-shaped bucket frame which is attached to the base body to the left and right of the cell spaces or annular spaces using bolts and wedges on the base body, wherein each bucket has at least one bucket back for holding material and a bucket cutter on which the cutting teeth are generally attached.
The side sections of the bucket cutters have a steep attitude angle with respect to the bucket wheel rotational axis. This attitude angle relates to the lower part of the side sections, which are just still actively involved in the digging process.
In the known designs of bucket wheels, this angle is typically above 602. As a result, a relatively steep angle can be
- 4 -implemented between the side slope and the front cut slope of the bucket.
During the excavation of relatively hard materials with compressive strengths of more than 5 MPa, it is frequently the case that the number of bucket cutters has to be higher than the number of buckets or of the cell spaces or annular spaces on the bucket wheel. In this case, the attachment of one or more additional bucket cutters without bucket backs, also referred to as pre-cutters, to an annular carrier of the base body of the bucket wheel is known. The equipping with teeth, that is to say the arrangement and the positioning of the cutting teeth is the same for all the bucket cutters including the so-called pre-cutter, in order to ensure an equal digging cross section.
During the cutting of relatively hard materials with a compressive strength of over 5.0 MPa it has, however, been found that the digging force load on a cutting tooth can be very high, with the result that the number of cutting teeth on a bucket cutter has to be increased significantly in order to reduce the digging cross sections for each individual cutting tooth. However, an excessively high number of teeth on a bucket cutter is limited owing to the available space for the arrangement of the cutting teeth on the bucket cutter, and at the same time impedes the flow of released chunks of material from the material composite. In addition, the objective is to introduce fewer individual strong digging force impulses into the entire system of the bucket wheel excavator but instead to introduce a plurality of attenuated digging force impulses, with the result that the digging forces which occur are substantially homogenized.
Furthermore, it has become apparent that particularly when excavating many useful minerals such as coal, chalk, limestone
During the excavation of relatively hard materials with compressive strengths of more than 5 MPa, it is frequently the case that the number of bucket cutters has to be higher than the number of buckets or of the cell spaces or annular spaces on the bucket wheel. In this case, the attachment of one or more additional bucket cutters without bucket backs, also referred to as pre-cutters, to an annular carrier of the base body of the bucket wheel is known. The equipping with teeth, that is to say the arrangement and the positioning of the cutting teeth is the same for all the bucket cutters including the so-called pre-cutter, in order to ensure an equal digging cross section.
During the cutting of relatively hard materials with a compressive strength of over 5.0 MPa it has, however, been found that the digging force load on a cutting tooth can be very high, with the result that the number of cutting teeth on a bucket cutter has to be increased significantly in order to reduce the digging cross sections for each individual cutting tooth. However, an excessively high number of teeth on a bucket cutter is limited owing to the available space for the arrangement of the cutting teeth on the bucket cutter, and at the same time impedes the flow of released chunks of material from the material composite. In addition, the objective is to introduce fewer individual strong digging force impulses into the entire system of the bucket wheel excavator but instead to introduce a plurality of attenuated digging force impulses, with the result that the digging forces which occur are substantially homogenized.
Furthermore, it has become apparent that particularly when excavating many useful minerals such as coal, chalk, limestone
- 5 -and the like a relatively high degree of comminution with limitation of the maximum sizes of the chunks is desired. A
defined digging cross section for each individual cutting tooth requires a sufficiently large distance between two adjacent cutting teeth on a bucket cutter. Also, a relatively large distance between the adjacent cutting teeth on the circumference of the bucket wheel is advantageous when breaking through hard occlusions, for example layers of siderite, clay ironstone or boulder flint and nodules of boulder flint.
However, the size of the bucket wheel must also remain limited, and the bucket wheel also cannot be widened to any desired extent in the direction of the bucket wheel rotational axis, so as to ensure sufficient distances between the cutting teeth when there is a large number of cutting teeth.
DISCLOSURE OF THE INVENTION
The object of the invention is to develop a bucket wheel for removing relatively hard materials having an increased number of cutting teeth, each of which can be assigned a defined digging cross section. In particular, the size of the chunks of removed material is to continue to be limited here.
This object is achieved on the basis of a bucket wheel for removing materials from a material composite according to the preamble of claim 1, on the basis of a bucket for such a bucket wheel according to the preamble of claim 10 and on the basis of a method according to claim 12 having the respectively characterizing features. Advantageous developments of the invention are specified in the dependent claims.
The invention includes the technical teaching that the cutting teeth which are accommodated on bucket cutters which are adjacent to one another are arranged at least partially offset with respect to one another, with the result that said bucket
defined digging cross section for each individual cutting tooth requires a sufficiently large distance between two adjacent cutting teeth on a bucket cutter. Also, a relatively large distance between the adjacent cutting teeth on the circumference of the bucket wheel is advantageous when breaking through hard occlusions, for example layers of siderite, clay ironstone or boulder flint and nodules of boulder flint.
However, the size of the bucket wheel must also remain limited, and the bucket wheel also cannot be widened to any desired extent in the direction of the bucket wheel rotational axis, so as to ensure sufficient distances between the cutting teeth when there is a large number of cutting teeth.
DISCLOSURE OF THE INVENTION
The object of the invention is to develop a bucket wheel for removing relatively hard materials having an increased number of cutting teeth, each of which can be assigned a defined digging cross section. In particular, the size of the chunks of removed material is to continue to be limited here.
This object is achieved on the basis of a bucket wheel for removing materials from a material composite according to the preamble of claim 1, on the basis of a bucket for such a bucket wheel according to the preamble of claim 10 and on the basis of a method according to claim 12 having the respectively characterizing features. Advantageous developments of the invention are specified in the dependent claims.
The invention includes the technical teaching that the cutting teeth which are accommodated on bucket cutters which are adjacent to one another are arranged at least partially offset with respect to one another, with the result that said bucket
- 6 -cutters can be moved on orbits which are offset in the direction of the bucket wheel rotational axis.
As a result of the offset arrangement of the cutting teeth on bucket cutters which are arranged adjacent to one another it is ensured that the bucket cutters which follow one another in the circumferential direction of the bucket wheel are equipped differently with teeth, with the result that the number of cutting teeth which are arranged on a bucket cutter can be reduced, but the number of bucket cutters which can be arranged overall on a bucket wheel can remain the same or even be increased. The invention also comprises here the possibility of accommodating two or more rows of cutting teeth on just one bucket cutter if the geometry of the bucket cutter permits it, 15. for example through corresponding lengthening of the bucket cutter in the rotational direction. As a result, cutting teeth can also be accommodated on a bucket cutter in various rows of teeth which follow one another in the rotational direction.
The offset between the cutting teeth can be embodied in such a way that a cutting tooth on a subsequent bucket cutter fills a tooth gap which is formed between two cutting teeth on a preceding bucket cutter. As a result of the offset between the cutting teeth, orbits of the cutting teeth are produced which are offset in the direction of the bucket wheel rotational axis, wherein two cutting teeth which can be moved on a common orbit are not arranged on bucket cutters which follow one another in the circumferential direction of the bucket wheel.
The cutting teeth which can be moved on common orbits are accommodated here on bucket cutters, between which at least one further bucket cutter with different equipment with teeth is present.
At least 2, 3, 4 or more bucket cutters with cutting teeth which are arranged offset with respect to one another can
As a result of the offset arrangement of the cutting teeth on bucket cutters which are arranged adjacent to one another it is ensured that the bucket cutters which follow one another in the circumferential direction of the bucket wheel are equipped differently with teeth, with the result that the number of cutting teeth which are arranged on a bucket cutter can be reduced, but the number of bucket cutters which can be arranged overall on a bucket wheel can remain the same or even be increased. The invention also comprises here the possibility of accommodating two or more rows of cutting teeth on just one bucket cutter if the geometry of the bucket cutter permits it, 15. for example through corresponding lengthening of the bucket cutter in the rotational direction. As a result, cutting teeth can also be accommodated on a bucket cutter in various rows of teeth which follow one another in the rotational direction.
The offset between the cutting teeth can be embodied in such a way that a cutting tooth on a subsequent bucket cutter fills a tooth gap which is formed between two cutting teeth on a preceding bucket cutter. As a result of the offset between the cutting teeth, orbits of the cutting teeth are produced which are offset in the direction of the bucket wheel rotational axis, wherein two cutting teeth which can be moved on a common orbit are not arranged on bucket cutters which follow one another in the circumferential direction of the bucket wheel.
The cutting teeth which can be moved on common orbits are accommodated here on bucket cutters, between which at least one further bucket cutter with different equipment with teeth is present.
At least 2, 3, 4 or more bucket cutters with cutting teeth which are arranged offset with respect to one another can
- 7 -particularly advantageously be accommodated distributed in a periodic sequence in the circumferential direction of the base body, with the result that each cutting tooth on adjaceht bucket cutters is assigned a separate digging cross section.
The number of cutting teeth per bucket which are accommodated on a bucket cutter can be divided here by the number of bucket cutters with different equipment with teeth. If, for example, two bucket cutters are provided which each have cutting teeth in a first arrangement and in a second arrangement in a periodic sequence in the circumferential direction of the base body, said bucket cutters permit the necessary number of cutting teeth on each of the bucket cutters to be halved. If three bucket cutters with cutting teeth which are respectively arranged offset in a periodic sequence in the circumferential direction of the base body are provided, the necessary number of cutting teeth per bucket cutter can be limited to a third.
In this context, each cutting tooth can be assigned the same digging cross section. The tooth arrangement of each bucket cutter and the sequence of bucket cutters with different arrangements in the period is appropriately determined here in such a way that each cutting tooth has to cut a separate digging cross section and the digging cross sections of the cutting teeth which are installed on a bucket cutter should not overlap here.
According to one advantageous development of the bucket wheel according to the invention, the bucket cutters are embodied in an arcuate shape and have a bucket cutter width which runs in the direction of the bucket wheel rotational axis and a bucket cutter depth which runs in the radial direction, wherein the ratio of the bucket cutter depth with respect to the bucket cutter width has a value of 0.1 to 0.7, preferably from 0.15 to 0.5 and particularly preferably from 0.2 to 0.4. Simply due to the relatively flat design of the bucket cutters with a large width and a large digging depth, a relatively flat design of
The number of cutting teeth per bucket which are accommodated on a bucket cutter can be divided here by the number of bucket cutters with different equipment with teeth. If, for example, two bucket cutters are provided which each have cutting teeth in a first arrangement and in a second arrangement in a periodic sequence in the circumferential direction of the base body, said bucket cutters permit the necessary number of cutting teeth on each of the bucket cutters to be halved. If three bucket cutters with cutting teeth which are respectively arranged offset in a periodic sequence in the circumferential direction of the base body are provided, the necessary number of cutting teeth per bucket cutter can be limited to a third.
In this context, each cutting tooth can be assigned the same digging cross section. The tooth arrangement of each bucket cutter and the sequence of bucket cutters with different arrangements in the period is appropriately determined here in such a way that each cutting tooth has to cut a separate digging cross section and the digging cross sections of the cutting teeth which are installed on a bucket cutter should not overlap here.
According to one advantageous development of the bucket wheel according to the invention, the bucket cutters are embodied in an arcuate shape and have a bucket cutter width which runs in the direction of the bucket wheel rotational axis and a bucket cutter depth which runs in the radial direction, wherein the ratio of the bucket cutter depth with respect to the bucket cutter width has a value of 0.1 to 0.7, preferably from 0.15 to 0.5 and particularly preferably from 0.2 to 0.4. Simply due to the relatively flat design of the bucket cutters with a large width and a large digging depth, a relatively flat design of
- 8 -the buckets is produced, with the result that appropriate separation of the cross-sectional profiles of the adjacent cutting teeth is achieved. The specified ratio between the bucket cutter depth and the bucket cutter width forms here a characteristic number for the flat design of the bucket, wherein the bucket cutter depth is understood to refer to the maximum bucket digging depth, with a maximum radial distance between all the cutting teeth installed on the bucket wheel or on all the bucket cutters being understood. The bucket width is understood to refer to the maximum distance between the outer cuttinq teeth in the direction of the bucket wheel rotational axis.
The bucket cutters have side sections which run to a point towards the bucket center, and the inventive design of the bucket is reflected in the attitude angle between the direction of extent of the side sections and the bucket wheel rotational axis. For example, the direction of extent of the side sections can enclose an attitude angle of less than 60 , preferably of less than 55 and particularly preferably of less than 50 with the bucket wheel rotational axis. If the bucket cutters are embodied in an arcuate shape, the direction of extent of the side sections can be formed by a tangent or a secant which is guided by the cutting teeth arranged on the side sections of the bucket cutters.
Furthermore, the inventive design of the blades is also reflected in the ratio between a cutting circle diameter of the bucket wheel and the bucket cutter width. The ratio of the cutting circle diameter with respect to the bucket width can have a value of less than 4, preferably of less than 3.5 and particularly preferably of less than 3 in the case of bucket wheels with a cutting circle diameter of less than 7 m, a value of less than 5, preferably of less than 4.5 and particularly preferably of less than 4 in the case of bucket wheels with a
The bucket cutters have side sections which run to a point towards the bucket center, and the inventive design of the bucket is reflected in the attitude angle between the direction of extent of the side sections and the bucket wheel rotational axis. For example, the direction of extent of the side sections can enclose an attitude angle of less than 60 , preferably of less than 55 and particularly preferably of less than 50 with the bucket wheel rotational axis. If the bucket cutters are embodied in an arcuate shape, the direction of extent of the side sections can be formed by a tangent or a secant which is guided by the cutting teeth arranged on the side sections of the bucket cutters.
Furthermore, the inventive design of the blades is also reflected in the ratio between a cutting circle diameter of the bucket wheel and the bucket cutter width. The ratio of the cutting circle diameter with respect to the bucket width can have a value of less than 4, preferably of less than 3.5 and particularly preferably of less than 3 in the case of bucket wheels with a cutting circle diameter of less than 7 m, a value of less than 5, preferably of less than 4.5 and particularly preferably of less than 4 in the case of bucket wheels with a
- 9 -cutting circle diameter of 7 m to 13 m, a value of less than 6, preferably of less than 5.5 and particularly preferably of less than 5 in the case of bucket wheels with a cutting circle diameter of 13 m to 18 m, and a value of less than 7, preferably of less than 6.5 and particularly preferably of less than 6 in the case of bucket wheels with a cutting circle diameter of more than 18 m. As a result of the very wide embodiment of the bucket wheel compared to the cutting circle diameter, a milling bucket wheel is produced, which permits a flat cutting angle relative to the slope edge. The maximum dimensions of the cross-sectional profiles for the cutting teeth determine essentially the distribution of the particle sizes of the released material here and can be used, in combination with the fissuring characteristic numbers of the removed material for the evaluation of the frequency of oversize material and flowing capability of the removed material.
The proportion of oversize material in the conveyed material can be additionally reduced by expedient configuration of a uniform gap between the individual bucket cutters arranged on the circumference of the bucket wheel. A particularly advantageous refinement can be obtained by the bucket cutters being able to be at a distance from one another in the rotational direction which corresponds approximately to twice the main dimensions of the digging cross sections. This generates a screening function which means that the maximum particle size of the removed material which passes into the bucket shells is limited and the frequency of oversize material can be limited.
According to one advantageous embodiment of the bucket wheel according to the invention, the buckets have bucket frames on which the bucket cutters and, in particular, bucket shells are accommodated, and wherein the buckets are detachably arranged
The proportion of oversize material in the conveyed material can be additionally reduced by expedient configuration of a uniform gap between the individual bucket cutters arranged on the circumference of the bucket wheel. A particularly advantageous refinement can be obtained by the bucket cutters being able to be at a distance from one another in the rotational direction which corresponds approximately to twice the main dimensions of the digging cross sections. This generates a screening function which means that the maximum particle size of the removed material which passes into the bucket shells is limited and the frequency of oversize material can be limited.
According to one advantageous embodiment of the bucket wheel according to the invention, the buckets have bucket frames on which the bucket cutters and, in particular, bucket shells are accommodated, and wherein the buckets are detachably arranged
- 10 -on the base body. In order to be able to quickly change the large number of bucket cutters when performing maintenance of the bucket wheel, it is appropriate to arrange the buckets detachably on the base body.
It is also advantageous that the bucket frame of the buckets can have a H-shaped structure with two longitudinal beams running approximately parallel and a transverse beam running between the longitudinal beams, the bucket cutters are accommodated on the longitudinal beams and extend between them in an approximately arcuate shape. The base body of the bucket wheel can have two annular carriers which extend as rotational bodies about the bucket wheel rotational axis, wherein transverse struts run at periodical intervals with respect to one another between the annular carriers. In this context the annular spaces into which the excavated material mass can escape during the lifting of the buckets come about between the annular carriers and the transverse struts. The transverse beam advantageously corresponds here in its position to the transverse strut, in order to avoid unnecessarily reducing the annular space under the bucket cutters. The bucket cutters are accommodated here on the longitudinal beams and run in an approximately arcuate shape between the two longitudinal beams.
The bucket frame can be detachably arranged on the base body here, with the result that minimum expenditure in terms of assembly and disassembly is produced if a bucket is to be removed from the bucket wheel.
A bucket can have at least two, preferably three and particularly preferably four or more bucket cutters, wherein one of the bucket cutters forms a main bucket cutter on which a bucket shell is arranged. The other bucket cutters form here the so-called pre-cutters, wherein the first bucket cutter on each bucket does not necessarily have to be the main bucket cutter, and pre-cutters can precede a main bucket cutter which
It is also advantageous that the bucket frame of the buckets can have a H-shaped structure with two longitudinal beams running approximately parallel and a transverse beam running between the longitudinal beams, the bucket cutters are accommodated on the longitudinal beams and extend between them in an approximately arcuate shape. The base body of the bucket wheel can have two annular carriers which extend as rotational bodies about the bucket wheel rotational axis, wherein transverse struts run at periodical intervals with respect to one another between the annular carriers. In this context the annular spaces into which the excavated material mass can escape during the lifting of the buckets come about between the annular carriers and the transverse struts. The transverse beam advantageously corresponds here in its position to the transverse strut, in order to avoid unnecessarily reducing the annular space under the bucket cutters. The bucket cutters are accommodated here on the longitudinal beams and run in an approximately arcuate shape between the two longitudinal beams.
The bucket frame can be detachably arranged on the base body here, with the result that minimum expenditure in terms of assembly and disassembly is produced if a bucket is to be removed from the bucket wheel.
A bucket can have at least two, preferably three and particularly preferably four or more bucket cutters, wherein one of the bucket cutters forms a main bucket cutter on which a bucket shell is arranged. The other bucket cutters form here the so-called pre-cutters, wherein the first bucket cutter on each bucket does not necessarily have to be the main bucket cutter, and pre-cutters can precede a main bucket cutter which
- 11 -is arranged further forward in the rotational direction of the bucket wheel, on a second bucket, which pre-cutters are arranged on a first bucket which precedes in the rotational direction. The arrangement of the bucket shell can be provided adjacent to the main bucket cutter, without a retaining connection being present between the bucket shell and the main bucket cutter. In particular, the bucket shells can be preferably detachably arranged on the bucket frame.
The at least one bucket shell per bucket is preferably to be configured in the region between the transverse connection of the bucket and the next bucket cutter in such a way that no material compression occurs in the inner region of the bucket and also it is not possible for chunks of rock to become stuck between the bucket back and a subsequent bucket cutter. For this purpose, a short bucket back may be sufficient, said bucket back implementing a smooth transition between a bucket cutter and the cell region or annular space region along the transverse connection of the bucket.
The invention is also directed at a bucket for a bucket wheel for removing materials from a material composite, particularly of high hardness, which bucket can be arranged on a base body which extends about a bucket wheel rotational axis, wherein bucket cutters are accommodated on the bucket, and wherein a plurality of cutting teeth, which can be moved on respective orbits about the bucket wheel rotational axis by rotation of the base body, are arranged on each bucket cutter, wherein there is provision that the cutting teeth which are accommodated on bucket cutters which are adjacent to one another are arranged at least partially offset with respect to one another, with the result that said bucket cutters can be moved on orbits which are offset in the direction of the bucket wheel rotational axis. The features and associated advantages which are described in conjunction with the bucket wheel are
The at least one bucket shell per bucket is preferably to be configured in the region between the transverse connection of the bucket and the next bucket cutter in such a way that no material compression occurs in the inner region of the bucket and also it is not possible for chunks of rock to become stuck between the bucket back and a subsequent bucket cutter. For this purpose, a short bucket back may be sufficient, said bucket back implementing a smooth transition between a bucket cutter and the cell region or annular space region along the transverse connection of the bucket.
The invention is also directed at a bucket for a bucket wheel for removing materials from a material composite, particularly of high hardness, which bucket can be arranged on a base body which extends about a bucket wheel rotational axis, wherein bucket cutters are accommodated on the bucket, and wherein a plurality of cutting teeth, which can be moved on respective orbits about the bucket wheel rotational axis by rotation of the base body, are arranged on each bucket cutter, wherein there is provision that the cutting teeth which are accommodated on bucket cutters which are adjacent to one another are arranged at least partially offset with respect to one another, with the result that said bucket cutters can be moved on orbits which are offset in the direction of the bucket wheel rotational axis. The features and associated advantages which are described in conjunction with the bucket wheel are
- 12 -also taken into account for the inventive bucket for such a bucket wheel.
The invention also relates to a method for removing materials from a material composite, in particular of high hardness, having at least one bucket on which cutting teeth are accommodated, in particular by means of bucket cutters, wherein the cutting teeth can be moved on at least two orbits by moving the bucket. In this context there is provision that cutting teeth of a first arrangement are moved on respective first orbits through the material composite, and wherein by the movement of the bucket, subsequently cutting teeth of a second arrangement are moved on respective second orbits through the material composite, wherein the second orbits are offset with respect to the first orbits in the direction of the bucket wheel rotational axis. The method can be implemented, in particular, with buckets which are arranged on a bucket wheel, and the movement of the buckets is generated by rotation of the bucket wheel about its bucket wheel rotational axis. In this context, the bucket wheel can be embodied as described above.
PREFERRED EXEMPLARY EMBODIMENT OF THE INVENTION
Further measures which improve the invention are illustrated in more detail below by means of the figures together with the description of a preferred exemplary embodiment of the invention. In the figures:
Figure 1 shows a perspective view of a bucket with four bucket cutters, Figure 2 shows a plan view of a detail of a bucket wheel according to the invention,
The invention also relates to a method for removing materials from a material composite, in particular of high hardness, having at least one bucket on which cutting teeth are accommodated, in particular by means of bucket cutters, wherein the cutting teeth can be moved on at least two orbits by moving the bucket. In this context there is provision that cutting teeth of a first arrangement are moved on respective first orbits through the material composite, and wherein by the movement of the bucket, subsequently cutting teeth of a second arrangement are moved on respective second orbits through the material composite, wherein the second orbits are offset with respect to the first orbits in the direction of the bucket wheel rotational axis. The method can be implemented, in particular, with buckets which are arranged on a bucket wheel, and the movement of the buckets is generated by rotation of the bucket wheel about its bucket wheel rotational axis. In this context, the bucket wheel can be embodied as described above.
PREFERRED EXEMPLARY EMBODIMENT OF THE INVENTION
Further measures which improve the invention are illustrated in more detail below by means of the figures together with the description of a preferred exemplary embodiment of the invention. In the figures:
Figure 1 shows a perspective view of a bucket with four bucket cutters, Figure 2 shows a plan view of a detail of a bucket wheel according to the invention,
- 13 -Figure 3 shows a perspective view of a section of the bucket wheel according to the present invention, Figure 4 shows a cross section through the bucket wheel, Figure 5 shows a section of the bucket wheel in a side view, Figure 6 shows the view of a bucket frame of a bucket embodied according to the invention, on which frame a plurality of bucket cutters are arranged, Figure 7a shows a schematic view of the tooth engagement of a bucket with cutting teeth according to the prior art, Figure 7b shows a schematic view of the tooth engagement of a bucket with an arrangement of cutting teeth onto adjacent bucket cutters, Figure 8 shows a schematic illustration of digging cross sections with three consecutive bucket cutters with varying equipment with teeth, and Figure 9 shows a schematic illustration of digging cross sections with varying equipment with teeth in four successive bucket cutters.
Figure 1 shows a perspective view of a bucket 12 which can be arranged on the base body 10 of a bucket wheel 1, as is shown in a perspective view in figure 3. The bucket 12 has a bucket frame 21 on which, for example, four bucket cutters 13 are arranged. The bucket cutters 13 extend transversely over the bucket frame 21 in an arcuate shape and cutting teeth 14 are arranged on the bucket cutters 13.
Figure 1 shows a perspective view of a bucket 12 which can be arranged on the base body 10 of a bucket wheel 1, as is shown in a perspective view in figure 3. The bucket 12 has a bucket frame 21 on which, for example, four bucket cutters 13 are arranged. The bucket cutters 13 extend transversely over the bucket frame 21 in an arcuate shape and cutting teeth 14 are arranged on the bucket cutters 13.
- 14 -Two of the bucket cutters 13 which are shown are fitted in the same way in each case with cutting teeth 14, and adjacent bucket cutters 13 each have different arrangements of cutting teeth 14. According to the invention, in this context the cutting teeth 14 which are accommodated on bucket cutters 13 adjacent to one another are arranged at least offset with respect to one another, with the result that the latter can be moved on orbits 15 and 16 which are offset in the direction of the bucket wheel rotational axis, if the bucket wheel 1 rotates about its bucket wheel rotational axis 11. For example, two first orbits 15 and two second orbits 16, which are each formed by connecting lines between cutting teeth 14 which are not arranged on adjacent bucket cutters 13, are shown for a number of cutting teeth 14. As a result of the fact that an offset is present between the orbits 15 and 16 of the cutting teeth 14, the cutting teeth 14 which are arranged on subsequent bucket cutters 13 run through respective tooth gaps 26 of preceding bucket cutters 13. This effect is shown by way of example with the cutting teeth 14' and 14", and the tooth gap 26 is shown between the cutting teeth 14' which are together accommodated on a preceding bucket cutter 13, and the tooth gap 26 is subsequently passed through with the cutting tooth 14" on the subsequent bucket cutter 13.
Figure 2 shows a plan view of a detail of the bucket wheel 1 with a sequence of a plurality of bucket cutters 13, which is shown in the rotational direction R. The view shows the arcuate configuration of the bucket cutters 13, on the outside of which the cutting teeth 14 are mounted. The arcuate shape of the bucket cutters 13 is determined by two side sections 19 which run together toward a bucket center 18. The side sections 19 have a direction of extent which encloses an attitude angle a with the bucket wheel rotational axis 11, which attitude angle a is not represented to scale by the projection illustration.
The direction of extent is formed, for example, by a connecting
Figure 2 shows a plan view of a detail of the bucket wheel 1 with a sequence of a plurality of bucket cutters 13, which is shown in the rotational direction R. The view shows the arcuate configuration of the bucket cutters 13, on the outside of which the cutting teeth 14 are mounted. The arcuate shape of the bucket cutters 13 is determined by two side sections 19 which run together toward a bucket center 18. The side sections 19 have a direction of extent which encloses an attitude angle a with the bucket wheel rotational axis 11, which attitude angle a is not represented to scale by the projection illustration.
The direction of extent is formed, for example, by a connecting
- 15 -line between the cutting teeth 14 accommodated on a bucket cutter 13, in the region of the side sections 19. The angle between the projected direction of extent of the side sections 19 and the bucket wheel rotational axis 11 is characterized by a and has a value of, for example, 502. In conjunction with figure 4 it becomes clear here that the ratio between the bucket cutter depth t and the bucket cutter width b has a low value, since the arcuate basic shape of the bucket cutters 13 is made very flat compared to a U-shaped bucket 12. The ratio between the bucket cutter depth t and the bucket cutter width b is, for example, only 0.2 to 0.4 here.
In the plan view of the detail of the bucket wheel 1 which is shown it is also apparent that the positions of the cutting teeth 14 on successive bucket cutters 13 in the direction of the bucket wheel rotational axis 11 are arranged offset with respect to one another in the rotational direction R. Overall, two different ways of equipping with teeth are shown, and for example a cutting tooth 14 lies on every second bucket cutter 13 on the bucket center 18, and on every second bucket cutter 13 the cutting teeth 14 are accommodated laterally offset with respect to the bucket center 18.
Figure 3 shows approximately half of the bucket wheel 1, and it is apparent that a large number of bucket cutters 13 are accommodated on the base body 10 of the bucket wheel 1. In this context, a plurality of bucket cutters 13 are accommodated on respective bucket frames 21, and adjacent bucket cutters 13 each have cutting teeth 14 with different equipment positions.
The base body 10 of the bucket wheel 1 has two annular carriers 27 which run parallel to one another and between which transverse beams 28 extend at uniform intervals. In the annular spaces which are formed in this way, bucket shells 24 are located, by means of which the deposited material is conveyed
In the plan view of the detail of the bucket wheel 1 which is shown it is also apparent that the positions of the cutting teeth 14 on successive bucket cutters 13 in the direction of the bucket wheel rotational axis 11 are arranged offset with respect to one another in the rotational direction R. Overall, two different ways of equipping with teeth are shown, and for example a cutting tooth 14 lies on every second bucket cutter 13 on the bucket center 18, and on every second bucket cutter 13 the cutting teeth 14 are accommodated laterally offset with respect to the bucket center 18.
Figure 3 shows approximately half of the bucket wheel 1, and it is apparent that a large number of bucket cutters 13 are accommodated on the base body 10 of the bucket wheel 1. In this context, a plurality of bucket cutters 13 are accommodated on respective bucket frames 21, and adjacent bucket cutters 13 each have cutting teeth 14 with different equipment positions.
The base body 10 of the bucket wheel 1 has two annular carriers 27 which run parallel to one another and between which transverse beams 28 extend at uniform intervals. In the annular spaces which are formed in this way, bucket shells 24 are located, by means of which the deposited material is conveyed
- 16 -into the inner side of the bucket wheel 1, in order finally to arrive at a transportation belt of a bucket wheel excavator.
Figure 4 shows a cross-sectional view of the bucket wheel 1 with the base body 10, on whose circumference bucket cutters 13 are arranged, and bucket shells 24 are shown on the inside.
The bucket cutters 13 have a bucket cutter width b which is determined essentially by the maximum width with which the outer cutting teeth 14 are accommodated on the bucket cutters 13. In addition, the bucket cutters 13 have a bucket cutter depth t which is determined by the radial distance between the innermost and outermost cutting teeth 14 on the bucket cutters 13. The bucket wheel 1 extends about the bucket wheel rotational axis 11 and has a cutting circle diameter 20 which is defined by the maximum diameter of the bucket wheel 1.
In figure 5, a section of the bucket wheel 1 is shown in a side view in which it is apparent that respective buckets 12 have, for example, four bucket cutters 13. The buckets 12 have bucket frames 21 on which the bucket cutters 13 with the cutting teeth 14 are accommodated. The bucket frames 21 are arranged by means of bolt connections 29 on the annular carrier 27, and each bucket 12 has a bucket shell 24 which is preceded by four bucket cutters 13 in the rotational direction R. A bucket cutter 13 forms here a main bucket cutter 13 and is connected to the bucket shell 24.
Figure 6 shows the view of a bucket 12 from the underside, and a bucket frame 21 can therefore be seen, four bucket cutters 13 being accommodated on said bucket frame 21. The bucket frame 21 has two longitudinal beams 22 which run approximately parallel to one another and between which a transverse beam 23 extends, with the result that the bucket frame 21 has essentially a H
Figure 4 shows a cross-sectional view of the bucket wheel 1 with the base body 10, on whose circumference bucket cutters 13 are arranged, and bucket shells 24 are shown on the inside.
The bucket cutters 13 have a bucket cutter width b which is determined essentially by the maximum width with which the outer cutting teeth 14 are accommodated on the bucket cutters 13. In addition, the bucket cutters 13 have a bucket cutter depth t which is determined by the radial distance between the innermost and outermost cutting teeth 14 on the bucket cutters 13. The bucket wheel 1 extends about the bucket wheel rotational axis 11 and has a cutting circle diameter 20 which is defined by the maximum diameter of the bucket wheel 1.
In figure 5, a section of the bucket wheel 1 is shown in a side view in which it is apparent that respective buckets 12 have, for example, four bucket cutters 13. The buckets 12 have bucket frames 21 on which the bucket cutters 13 with the cutting teeth 14 are accommodated. The bucket frames 21 are arranged by means of bolt connections 29 on the annular carrier 27, and each bucket 12 has a bucket shell 24 which is preceded by four bucket cutters 13 in the rotational direction R. A bucket cutter 13 forms here a main bucket cutter 13 and is connected to the bucket shell 24.
Figure 6 shows the view of a bucket 12 from the underside, and a bucket frame 21 can therefore be seen, four bucket cutters 13 being accommodated on said bucket frame 21. The bucket frame 21 has two longitudinal beams 22 which run approximately parallel to one another and between which a transverse beam 23 extends, with the result that the bucket frame 21 has essentially a H
- 17 -shape. The bucket cutters 13 extend here in an approximately arcuate shape between the two longitudinal beams 22.
Figure 7a shows a schematic view of the tooth engagement of a plurality of cutting teeth 14 which are arranged on a bucket 12 according to the prior art, wherein the arrangement of the cutting teeth 14 of a plurality of cutters 12 on a bucket wheel with respect to one another are the same in each case. Each cutting tooth 14 releases an assigned digging cross section 17 from the material composite 25 here, wherein the digging cross sections 17 each lie adjacent and approximately at the same height with respect to one another in a row. The bucket 12 is moved laterally against the material composite 25 here in the bucket wheel rotational axis 11 shown, as indicated by a direction arrow. As a result, only cutting teeth 14 which are arranged on the side section 19 of the bucket 12 enter into engagement with the material composite 25. For example, eight cutting teeth 14 per bucket 12 are arranged at the same height as one another on the side section 19.
Figure 7b shows a bucket 12 with two bucket cutters 13, with the result that the eight cutting teeth 14 according to figure 7a are distributed between the two bucket cutters 13.
Consequently, each bucket cutter 13 now has only four cutting teeth 14 which are arranged on the bucket cutter 13 at a respectively larger distance from one another compared to the arrangement according to figure 7a. The cutting teeth 14 on the exemplary two bucket cutters 13 are arranged offset with respect to one another, with the result that cutting teeth 14 which are accommodated on a common bucket cutter 13 remove digging cross sections 17 which are not adjacent to one another from the material composite 25. Simply the engagement of the cutting teeth 14 on the subsequent bucket cutter 13 causes the further digging cross sections 17 which are located between the initially removed digging cross sections 17 to be removed, with ,
Figure 7a shows a schematic view of the tooth engagement of a plurality of cutting teeth 14 which are arranged on a bucket 12 according to the prior art, wherein the arrangement of the cutting teeth 14 of a plurality of cutters 12 on a bucket wheel with respect to one another are the same in each case. Each cutting tooth 14 releases an assigned digging cross section 17 from the material composite 25 here, wherein the digging cross sections 17 each lie adjacent and approximately at the same height with respect to one another in a row. The bucket 12 is moved laterally against the material composite 25 here in the bucket wheel rotational axis 11 shown, as indicated by a direction arrow. As a result, only cutting teeth 14 which are arranged on the side section 19 of the bucket 12 enter into engagement with the material composite 25. For example, eight cutting teeth 14 per bucket 12 are arranged at the same height as one another on the side section 19.
Figure 7b shows a bucket 12 with two bucket cutters 13, with the result that the eight cutting teeth 14 according to figure 7a are distributed between the two bucket cutters 13.
Consequently, each bucket cutter 13 now has only four cutting teeth 14 which are arranged on the bucket cutter 13 at a respectively larger distance from one another compared to the arrangement according to figure 7a. The cutting teeth 14 on the exemplary two bucket cutters 13 are arranged offset with respect to one another, with the result that cutting teeth 14 which are accommodated on a common bucket cutter 13 remove digging cross sections 17 which are not adjacent to one another from the material composite 25. Simply the engagement of the cutting teeth 14 on the subsequent bucket cutter 13 causes the further digging cross sections 17 which are located between the initially removed digging cross sections 17 to be removed, with ,
- 18 -the result that each cutting tooth 14 is assigned a defined digging cross section 17 which is of a respective size where a limitation of the maximum chunk size is achieved. In particular it is ensured that the cutting forces which act on the cutting teeth 14 do not become too large and the cutting teeth 14 can be at a sufficient distance from one another.
Figures 8 and 9 show by way of example digging cross sections 17 such as can be removed from the material composite 25 if three (figure 8) or four (figure 9) bucket cutters 13 with respectively the different cutting tooth equipment are provided.
The invention is not limited in its implementation to the preferred exemplary embodiment specified above. Instead, a number of variants are conceivable which make use of the illustrated solution even in the case of embodiments which are of a basically different type. All of the features and/or advantages which proceed from the claims, the description or the drawings, including structural details or spatial arrangements, can be essential to the invention either per se or in a wide variety of combinations.
Figures 8 and 9 show by way of example digging cross sections 17 such as can be removed from the material composite 25 if three (figure 8) or four (figure 9) bucket cutters 13 with respectively the different cutting tooth equipment are provided.
The invention is not limited in its implementation to the preferred exemplary embodiment specified above. Instead, a number of variants are conceivable which make use of the illustrated solution even in the case of embodiments which are of a basically different type. All of the features and/or advantages which proceed from the claims, the description or the drawings, including structural details or spatial arrangements, can be essential to the invention either per se or in a wide variety of combinations.
- 19 -List of Reference Symbols 1 Bucket wheel Base body 5 11 Bucket wheel rotational axis 12 Bucket 13 Bucket cutter, main bucket cutter 14 Cutting tooth 14' Cutting tooth 10 14" Cutting tooth First orbit 16 Second orbit 17 Digging cross section 18 Bucket center 15 19 Side section Cutting circle diameter 21 Bucket frame 22 Longitudinal beam 23 Transverse beam
20 24 Bucket shell Material composite 26 Tooth gap 27 Annular carrier 28 Transverse beam 25 29 Bolt connection Bucket cutter width Bucket cutter depth a Attitude angle R Rotational direction
Claims (12)
1. A bucket wheel for a bucket wheel excavator for removing materials from a material composite, the bucket wheel having a base body which extends about a bucket wheel rotational axis and on which, distributed about the circumference, a plurality of buckets with bucket cutters are accommodated, and wherein a plurality of cutting teeth, which are moveable on respective orbits about bucket wheel rotation axis by the rotation of the base body are arranged on each bucket cutter, and the cutting teeth which are accommodated on bucket cutters which are adjacent to one another are arranged at least partially offset with respect to one another, with the result that said cutting teeth are moveable on orbits which are offset in the direction of the bucket wheel rotational axis, wherein each of the plurality of buckets has at least two bucket cutters, wherein one of the bucket cutters forms a main bucket cutter on which a bucket shell is arranged.
2. The bucket wheel as claimed in claim 1, wherein at least two bucket cutters with cutting teeth, which are arranged offset with respect to one another, are accommodated, distributed in a periodic sequence in the circumferential direction of the base body, with the result that each cutting tooth on bucket cutters which are adjacent to one another is assigned a separate digging cross section.
3. The bucket wheel as claimed in claim 1 or 2, wherein the bucket cutters are embodied in an arcuate shape and have a bucket cutter width which runs in the direction of the bucket wheel rotational axis and a bucket cutter depth which runs in the radial direction, wherein the ratio of the bucket cutter depth with respect to the bucket cutter width has a value of 0.1 to 0.7.
4. The bucket wheel as claimed in any one of claims 1 to 3, wherein the bucket cutters have side sections which run to a point towards the bucket center, wherein the direction of extent of the side sections encloses an attitude angle .alpha. of less than 60°.
5. The bucket wheel as claimed in any one of claims 1 to 4, wherein the bucket wheel has a cutting circle diameter, wherein the ratio of the cutting circle diameter with respect to the bucket cutter width has a value of less than 4 in the case of bucket wheels with a cutting circle diameter of less than 7 m, a value of less than 5 in the case of bucket wheels with a cutting circle diameter of 7 m to 13 m, a value of less than 6 in the case of bucket wheels with a cutting circle diameter of 13 m to 18 m, and a value of less than 7 in the case of bucket wheels with a cutting circle diameter of more than 18 m.
6. The bucket wheel as claimed in any one of claims 1 to 5, wherein the buckets have bucket frames on which the bucket cutters are accommodated, and wherein the buckets are detachably arranged on the base body.
7. The bucket wheel as claimed in claim 6, wherein the bucket frames have a H-shaped structure with two longitudinal beams running approximately parallel and a transverse beam running between the longitudinal beams, the bucket cutters are accommodated on the longitudinal beams and extend between them in an approximately arcuate shape.
8. The bucket wheel as claimed in any one of claims 1 to 7, wherein a bucket has three or four bucket cutters.
9. The bucket wheel as claimed in any one of claims 1 to 8, wherein the bucket cutters are at a distance from one another in the circumferencial direction which corresponds to twice the main dimensions of the digging cross sections with the result that the distance between the bucket cutters produces a screening function.
10. A bucket for a bucket wheel of a bucket wheel excavator for removing materials from a material composite, which bucket is arrangeable on a base body which extends about a bucket wheel rotational axis, wherein bucket cutters are accommodated on the bucket, and wherein a plurality of cutting teeth, which are moveable on respective orbits about the bucket wheel rotational axis by rotation of the base body, are arranged on each bucket cutter, and the cutting teeth, which are accommodated on bucket cutters which are adjacent to one another are arranged at least partially offset with respect to one another, with the result that said cutting teeth are moveable on orbits which are offset in the direction of the bucket wheel rotational axis, wherein the bucket has at least two bucket cutters, wherein one of the bucket cutters forms a main bucket cutter on which a bucket shell is arranged.
11. A method for removing materials from a material composite using a bucket wheel excavator having at least one bucket for a bucket wheel of the bucket wheel excavator on which cutting teeth are accommodated wherein the cutting teeth are moved on at least two orbits by moving the bucket about a bucket wheel rotational axis, wherein cutting teeth of a first arrangement are moved on respective first orbits through the material composite, and wherein by the movement of the bucket, subsequently cutting teeth of a second arrangement are moved on respective second orbits through the material composite, wherein the second orbits are offset with respect to the first orbits in the direction of the bucket wheel rotational axis, and wherein the at least one bucket has at least two bucket cutters, wherein a first of the at least two bucket cutters forms a main bucket cutter on which a bucket shell is arranged and to which cutting teeth of the first arrangement are arranged and wherein a second of the at least two bucket cutters forms a secondary bucket cutter to which cutting teeth of the second arrangement are arranged.
12. The method for removing materials as claimed in claim 11 with a bucket wheel as claimed in any one of claims 1 to 9.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102013102407.6A DE102013102407B4 (en) | 2013-03-11 | 2013-03-11 | Paddle wheel for breaking down materials from a material bond of high hardness |
| DE102013102407.6 | 2013-03-11 | ||
| PCT/EP2014/054547 WO2014139927A2 (en) | 2013-03-11 | 2014-03-10 | Bucket wheel for removing materials from a material composite, particularly of high hardness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2904147A1 CA2904147A1 (en) | 2014-09-18 |
| CA2904147C true CA2904147C (en) | 2020-03-31 |
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Family Applications (1)
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|---|---|---|---|
| CA2904147A Active CA2904147C (en) | 2013-03-11 | 2014-03-10 | Bucket wheel for removing materials from a material composite, particularly of high hardness |
Country Status (9)
| Country | Link |
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| CN (1) | CN105008621B (en) |
| AU (1) | AU2014230973B2 (en) |
| CA (1) | CA2904147C (en) |
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| PE (1) | PE20151823A1 (en) |
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|---|---|---|---|---|
| RU207932U1 (en) * | 2021-08-21 | 2021-11-24 | Закрытое акционерное общество «Дробмаш» | ROTARY EXCAVATOR WHEEL |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110439055B (en) * | 2019-07-19 | 2024-03-08 | 中国水电基础局有限公司 | Excavator bucket |
| DE102019214626A1 (en) * | 2019-09-25 | 2020-09-24 | Thyssenkrupp Ag | Device and method for optimizing mining processes, as well as use and computer program product |
| CN116180832B (en) * | 2023-04-19 | 2023-07-21 | 中铁城建集团第一工程有限公司 | Milling hole wall machine head of milling and digging machine |
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| DE3427038A1 (en) * | 1984-07-21 | 1986-01-30 | Mannesmann AG, 4000 Düsseldorf | EXCAVATOR WHEEL |
| DE3444563A1 (en) * | 1984-12-06 | 1986-06-19 | Lehnhoff Hartstahl GmbH & Co, 7570 Baden-Baden | EXCAVATOR TOOTH ARRANGEMENT |
| DD262257B5 (en) * | 1987-07-03 | 1994-04-21 | Buckau Maschf Gmbh | Arrangement of lickerins on scooter wheels |
| DE8808447U1 (en) * | 1988-07-01 | 1989-10-26 | O & K Orenstein & Koppel Ag, 1000 Berlin, De | |
| DE9002089U1 (en) * | 1990-02-22 | 1991-07-18 | O & K Orenstein & Koppel Ag, 1000 Berlin, De | |
| DE19547170C2 (en) * | 1995-12-16 | 1997-12-11 | Man Takraf Foerdertechnik Gmbh | Milling drum for an open pit mining device that works in both directions |
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-
2013
- 2013-03-11 DE DE102013102407.6A patent/DE102013102407B4/en active Active
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2014
- 2014-03-10 PE PE2015001897A patent/PE20151823A1/en unknown
- 2014-03-10 CN CN201480014007.7A patent/CN105008621B/en active Active
- 2014-03-10 EA EA201591528A patent/EA030626B1/en not_active IP Right Cessation
- 2014-03-10 WO PCT/EP2014/054547 patent/WO2014139927A2/en active Application Filing
- 2014-03-10 CA CA2904147A patent/CA2904147C/en active Active
- 2014-03-10 AU AU2014230973A patent/AU2014230973B2/en active Active
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2015
- 2015-09-09 CL CL2015002554A patent/CL2015002554A1/en unknown
- 2015-10-09 MA MA38471A patent/MA38471B1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU207932U1 (en) * | 2021-08-21 | 2021-11-24 | Закрытое акционерное общество «Дробмаш» | ROTARY EXCAVATOR WHEEL |
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| PE20151823A1 (en) | 2016-01-10 |
| DE102013102407A1 (en) | 2014-09-25 |
| EA201591528A1 (en) | 2016-03-31 |
| CL2015002554A1 (en) | 2016-06-17 |
| MA38471A1 (en) | 2016-04-29 |
| CA2904147A1 (en) | 2014-09-18 |
| DE102013102407B4 (en) | 2021-12-30 |
| CN105008621B (en) | 2017-11-14 |
| AU2014230973B2 (en) | 2018-07-26 |
| EA030626B1 (en) | 2018-09-28 |
| WO2014139927A2 (en) | 2014-09-18 |
| AU2014230973A1 (en) | 2015-09-17 |
| WO2014139927A3 (en) | 2014-11-20 |
| MA38471B1 (en) | 2016-11-30 |
| CN105008621A (en) | 2015-10-28 |
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