DE102013102407B4 - Paddle wheel for breaking down materials from a material bond of high hardness - Google Patents

Abstract

Bucket wheel (1) for a bucket wheel excavator for mining materials from a material composite (25), with a base body (10) which extends around a bucket wheel rotation axis (11) and on which several blades (12) with bucket knives (13) are distributed around the circumference ) and wherein a plurality of cutting teeth (14) are arranged on each bucket knife (13), which can be moved on respective circular paths (15, 16) by rotating the base body (10) about the bucket wheel rotation axis (11), the cutting teeth (14) , which are received on adjacent blade knives (13), are at least partially offset from one another, so that they can be moved on circular paths (15, 16) offset in the direction of the blade wheel rotation axis (11), the blades (12) at least two blade blades (13 ), one of the shovel knives (13) forming a main shovel knife (13) on which a shovel shell (24) is arranged, characterized in that the shovel Eln (12) have shovel frames (21) on which the shovel blades (13) are received and wherein the blades (12) are detachably arranged on the base body (10), the shovel frames (21) having an H-shaped structure with two approximately parallel extending longitudinal beam (22) and a transverse beam (23) extending between the longitudinal beams (22), the shovel knives (13) being received on the longitudinal beams (22) and extending approximately arcuately between them.

Description

The present invention relates to a paddle wheel for the mining of materials from a material composite, in particular of high hardness, with a base body which extends around a paddle wheel rotation axis and on which a plurality of blades with paddle knives are distributed around the circumference and a plurality of cutting teeth are arranged on each paddle knife, which can be moved on respective circular paths by rotating the base body around the impeller rotation axis.

Bucket wheels are used in particular for bucket wheel excavators, and bucket wheel excavators are usually used in open pit mining for the removal and removal of large quantities of materials. The material is released from a material association, and the material association can be, for example, a mountain association or an artificially heaped dump. Hard materials have compressive strengths of more than 5.0 MPa, so that paddle wheels have to be designed in a special way in order to do justice to the greater hardness of the material composite.

The bucket wheel is set in rotation about its bucket wheel rotation axis by a drive of the bucket wheel excavator, and the material to be mined such as lignite, chalk, limestone and the like is detached from the material composite by the rotating bucket wheel and lifted vertically in buckets in order to then move onto a conveyor belt for further transport reach. Hard mining materials are, for example, hard brown coal, bituminous coal, marl or the like. As a load-bearing basic structure, the bucket wheel has a base body that rotates around the bucket wheel rotation axis, which runs roughly horizontally to the spoil slope of the mountain range, and the bucket wheel excavator swivels the bucket wheel laterally in the direction of the bucket wheel rotation axis in order to generate a feed rate. For this purpose, the bucket wheel excavator has a superstructure, and the pivoting can be carried out by rotating on a crawler chassis, but there is also the possibility that the bucket wheel is moved relative to the mountain range by moving the bucket wheel excavator by means of the crawler chassis.

Several blades are arranged on the approximately cylindrical base body, which blades have a large number of cutting teeth. Often each bucket is assigned a main bucket knife and one or more so-called pre-cutters, and the material loosened from the material bond by the cutting teeth gets into the bucket and then onto the conveyor belt of the bucket wheel excavator.

For example, the DE 10 2004 033 934 A1 a bucket wheel for removing materials from a material composite, and the bucket wheel is operated with a bucket wheel excavator for deep cutting below its contact area. Several blades are arranged on the base body of the blade wheel, and the blades have approximately triangular or trapezoidal blade blades on which several cutting teeth are arranged. Due to the lateral pivoting of the boom of the bucket wheel excavator, a side section of the bucket knife always comes into engagement with the material bond, so that, depending on the pivoting direction of the boom of the bucket wheel excavator, either a left or a right side section, which is referred to as a segment, comes into engagement with the material bond.

In the base body of the bucket wheel, depending on the number of buckets attached to the bucket wheel, either radially extended cells or annular spaces are provided, into which the excavated material can escape when the bucket is lifted so as not to complicate the digging process. In order not to endanger the emptying of the cells or annular spaces, especially with sticky materials, too high a number of cells or annular spaces on the base body is not desirable. In the case of small paddle wheels in the range of 4 m to 5 m in diameter, the number of annular spaces can be limited to approx. 10 to 15 and in the case of large paddle wheels with a diameter of 15 m to 20 m to approx. 20 to 25.

In addition to the triangular or trapezoidal blade blades shown, blades with a U-shaped blade frame are known, which is attached to the base body to the right and left of the cell or annular spaces with bolts and wedges on the base body, with each blade at least one blade back for material pick-up and one Has shovel knife, on which the cutting teeth are usually attached.

The side sections of the bucket knives have a steep angle of attack in relation to the bucket wheel rotation axis. This angle of attack refers to the lower part of the side sections that are still actively involved in the digging process. In the known paddle wheel shapes, this angle is typically more than 60 °. As a result, a relatively steep angle can be achieved between the side slope and the front slope slope of the blade.

When digging harder materials with compressive strengths of more than 5 MPa, it is not uncommon for the number of shovel knives to be higher than the number of shovels or the cell or annular spaces on the Paddle wheel. In this case, the attachment of one or more additional blade knives without a blade back, also known as a precutter, on a ring carrier of the base body of the blade wheel is known. The set of teeth, i.e. the arrangement and adjustment of the cutting teeth, is the same for all shovel knives, including the so-called pre-cutter, in order to ensure the same digging cross-section.

When cutting harder materials with a compressive strength of over 5.0 MPa, however, it has been shown that the digging force load on a cutting tooth can be very high, so that the number of cutting teeth on a shovel knife has to be increased significantly to accommodate the digging cross-sections for each individual cutting tooth to reduce. However, an excessively high number of teeth on a shovel knife is limited due to the space available for arranging the cutting teeth on the shovel knife and in the process worsens the material flow of loosened material chunks from the material assembly. Furthermore, the aim is to ensure that fewer isolated, strong digging force shocks are introduced into the overall system of the bucket wheel excavator, but rather several weakened digging force shocks, so that the digging forces that occur are essentially equalized.

Furthermore, it has been shown that, particularly when excavating many useful minerals such as coal, chalk, limestone and the like, a higher degree of comminution with a limitation of the maximum chunk size is desirable. A defined digging cross-section for each individual cutting tooth requires a sufficiently large distance between two adjacent cutting teeth on a shovel knife. A greater distance between the adjacent cutting teeth on the circumference of the paddle wheel is also advantageous when penetrating hard inclusions, for example layers of siderite, clay iron or flint stone and flint lumps. However, the size of the paddle wheel must also remain limited, which furthermore cannot be arbitrarily widened in the direction of the paddle wheel rotation axis in order to ensure sufficient spacing between the cutting teeth with a large number of cutting teeth.

From the DE 1 759 535 A a bucket wheel for a bucket wheel excavator is known.

From the DD 262 257 A1 an arrangement of scribing on paddle wheels is known.

The object of the invention is to develop a paddle wheel for mining harder materials with an increased number of cutting teeth, each of which can be assigned a defined digging cross section. In particular, the chunk size of the extracted material should remain limited.

This object is achieved on the basis of a paddle wheel for breaking down materials from a composite material according to the preamble of claim 1 with the characterizing features of claim 1 and a shovel for such a paddle wheel with the features of claim 8. Advantageous further developments of the invention are given in the dependent claims.

The invention includes the technical teaching that the cutting teeth, which are received on adjacent blade knives, are at least partially offset from one another, so that they can be moved on circular paths offset in the direction of the blade wheel rotation axis.

The offset arrangement of the cutting teeth on adjacent blade knives means that the number of teeth on successive blade blades in the circumferential direction of the blade wheel is different, so that the number of cutting teeth that are arranged on a blade blade can be reduced, but the number of blade blades , which can be arranged in total on a paddle wheel, can remain the same or even be increased. The invention also includes the possibility that two or more rows of cutting teeth are recorded on only one shovel knife, if the geometry of the shovel knife allows this, for example by a corresponding extension of the shovel knife in the direction of rotation. In this way, cutting teeth can also be accommodated on a shovel knife in different rows of teeth following one another in the direction of rotation.

The offset of the cutting teeth can be carried out in such a way that a cutting tooth on a following blade fills a tooth gap that is formed between two cutting teeth on a leading blade. The offset of the cutting teeth to one another results in circular paths of the cutting teeth that are offset in the direction of the bucket wheel rotation axis, with two cutting teeth, which can be moved on a common circular path, not being arranged on bucket knives following one another in the circumferential direction of the bucket wheel. The cutting teeth, which can be moved on common circular paths, are received on shovel knives, between which there is at least one further shovel knife with a different set of teeth.

With particular advantage, at least 2, 3, 4 or more shovel knives with offset from one another can be distributed in a periodic sequence in the circumferential direction of the base body Be added cutting teeth, so that each cutting tooth on adjacent shovel knives is assigned a separate digging cross-section. The number of cutting teeth per shovel, which are received on a shovel knife, can be divided by the number of shovel knives with mutually different tooth configurations. If, for example, two shovel knives are provided, which have cutting teeth in a periodic sequence in the circumferential direction of the base body, each in a first arrangement and in a second arrangement, then these enable the required number of cutting teeth on each of the shovel knives to be halved. If three shovel knives are provided with cutting teeth arranged offset in a periodic sequence in the circumferential direction of the base body, the required number of cutting teeth per shovel knife can be limited to a third. Each cutting tooth can have the same grave cross-section. The tooth arrangement of each shovel knife and the order of the shovel knives with different arrangements in the period is sensibly determined so that each cutting tooth has to cut a separate digging cross-section and the digging cross-sections of the cutting teeth installed on a shovel knife should not overlap.

According to an advantageous development of the bucket wheel according to the invention, the bucket knives are curved and have a bucket knife width running in the direction of the bucket wheel rotation axis and a bucket knife depth running in the radial direction, the ratio of the bucket knife depth to the bucket knife width having a value of 0.1 to 0.7, preferably 0 , 15 to 0.5 and particularly preferably from 0.2 to 0.4. Only the relatively flat design of the shovel knives with a large width and a shallow digging depth results in a relatively flat design of the shovels, so that a meaningful separation of the cross-sectional profiles of the adjacent cutting teeth is achieved. The specified ratio between the shovel knife depth and the shovel knife width forms a key figure for the flat design of the shovel, whereby the shovel knife depth is understood to mean the maximum shovel dig depth, which means a maximum radial distance of all cutting teeth installed on the paddle wheel or on all of the shovel knives. The blade width is understood to mean the maximum distance between the outer cutting teeth in the direction of the blade wheel rotation axis.

The bucket knives have side sections tapering towards the middle of the bucket, and the construction of the bucket according to the invention is reflected in the angle of incidence between the direction of extent of the side sections and the bucket wheel rotation axis. For example, the direction of extent of the side sections with the impeller rotation axis can include an angle of incidence of less than 60 °, preferably of less than 55 ° and particularly preferably of less than 50 °. If the shovel knives are arcuate, the direction of extension 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 shovel knives.

Furthermore, the construction of the blade according to the invention is also reflected in the ratio between a cutting diameter of the blade wheel and the blade width. The ratio of the cutting circle diameter to the blade width can be below 4, preferably below 3.5 and particularly preferably below 3 for blade wheels with a cutting circle diameter of less than 7 m, and a value for blade wheels with a cutting circle diameter of 7 m to 13 m of less than 5, preferably of less than 4.5 and particularly preferably of less than 4, for paddle wheels with a cutting diameter of 13 m to 18 m a value of less than 6, preferably of less than 5.5 and particularly preferably of less than 5 and for paddle wheels with a cutting circle diameter of more than 18 m has a value of less than 7, preferably less than 6.5 and particularly preferably less than 6. The very wide design of the paddle wheel in relation to the cutting diameter creates a milling paddle wheel, which allows a flat cutting angle relative to the slope edge. The maximum dimensions of the cross-sectional profiles for the cutting teeth essentially determine the grain size distribution of the dissolved material and can be used in combination with the fracture indicators of the excavated material to evaluate the frequency of oversized grains and the flowability of the excavated material.

The oversize fraction in the conveyed material can be additionally reduced by an expedient design of a uniform gap between the individual blade blades arranged on the circumference of the blade wheel. A particularly advantageous embodiment results from the fact that the shovel knives can be at a distance from one another in the direction of rotation that corresponds approximately to twice the main dimensions of the grave cross-sections. This creates a sieve function which has the effect that the maximum grain size of the mining material that gets into the shovel shells is limited and the frequency of oversized grains can be limited.

According to the invention, the blades have blade frames on which the blade knives and, in particular, blade shells are received, and with the blades being detachably arranged on the base body. To the large number of In order to be able to change the bucket knife quickly during the maintenance of the bucket wheel, it makes sense to releasably arrange the buckets on the base body.

According to the invention, the blade frame of the blades has an H-shaped structure with two approximately parallel longitudinal beams and a transverse beam extending between the longitudinal beams, the blade blades being received on the longitudinal beams and extending approximately in an arc between them. The main body of the paddle wheel can have two ring carriers, which extend as rotational bodies around the paddle wheel axis of rotation, with transverse bars extending between the ring carriers at periodic distances from one another. Between the ring carriers and the transverse bars, the annular spaces are created into which the dredged material can escape when the shovels are lifted. The position of the cross bar advantageously corresponds to the cross bar in order not to unnecessarily reduce the size of the annular space under the shovel knives. The shovel knives are received on the longitudinal beams and run approximately in an arc between the two longitudinal beams. The blade frame can be detachably arranged on the base body, so that a minimal assembly and disassembly effort is generated when a blade is to be detached from the blade wheel.

A shovel can have at least two, preferably three and particularly preferably four or more shovel knives, one of the shovel knives forming a main shovel knife on which a shovel shell is arranged. The remaining shovel knives form the so-called precutters, whereby the first shovel knife does not necessarily have to represent the main shovel knife for each shovel, and a main shovel knife arranged further forward in the direction of rotation of the paddle wheel on a second shovel can lead ahead of the pre-cutters arranged on a first shovel in the direction of rotation ahead . The arrangement of the shovel shell can be provided adjacent to the main shovel knife, without there being a holding connection between the shovel shell and the main shovel knife. In particular, the vane shells can be arranged preferably detachably on the vane frame.

The at least one shovel shell per shovel is preferably to be designed in the area between the cross connection of the shovel and the next shovel knife in such a way that neither material compression in the inner region of the shovel nor jamming of the rocks between the shovel back and a following shovel knife is possible. For this purpose, a short blade back can be sufficient, which realizes a smooth transition between a blade and the cell or annulus area along the cross connection of the blade.

The invention is also directed to a vane for a paddle wheel for breaking down materials from a material composite, in particular of high hardness, which can be arranged on a base body which extends around a paddle wheel rotation axis, with paddle blades being received on the shovel and with a plurality of cutting teeth on each paddle blade which can be moved on respective circular paths by rotating the base body about the bucket wheel rotation axis, it being provided that the cutting teeth, which are received on mutually adjacent bucket knives, are at least partially offset from one another, so that they can be moved on circular paths offset in the direction of the bucket wheel rotation axis are. The features described in connection with the paddle wheel and the associated advantages are also taken into account for the paddle according to the invention for such a paddle wheel.

The paddle wheel according to the invention can be used, for example, for a method for breaking down materials from a composite material, in particular with a high hardness, with at least one shovel on which cutting teeth are held, in particular by means of shovel knives, with the cutting teeth being movable on at least two circular paths by moving the shovel. It is provided that cutting teeth of a first arrangement are moved on first circular paths through the material assembly and the movement of the shovel subsequently moves cutting teeth of a second arrangement on respective second circular paths through the material assembly, the second circular paths in the direction of the bucket wheel rotation axis to the first circular paths are offset. The method can in particular be carried out with blades which are arranged on a blade wheel, and the movement of the blades is generated by rotating the blade wheel about its axis of rotation of the blade wheel. The paddle wheel can be designed as described above.

• 1 eine perspektivische Ansicht einer Schaufel mit vier Schaufelmessern,
• 2 eine Draufsicht auf einen Ausschnitt eines erfindungsgemäßen Schaufelrades,
• 3 eine perspektivische Ansicht eines Abschnittes des Schaufelrades gemäß der vorliegenden Erfindung,
• 4 einen Querschnitt durch das Schaufelrad,
• 5 einen Abschnitt des Schaufelrades in einer Seitenansicht,
• 6 die Ansicht eines Schaufelrahmens einer erfindungsgemäß ausgeführten Schaufel, an dem mehrere Schaufelmesser angeordnet sind,
• 7a eine schematische Ansicht des Zahneingriffs einer Schaufel mit Schneidzähnen gemäß dem Stand der Technik,
• 7b eine schematische Ansicht des Zahneingriffs einer Schaufel mit einer Anordnung von Schneidzähnen an zwei benachbarten Schaufelmessern,
• 8 eine schematische Darstellung von Grabquerschnitten mit in aufeinander folgenden drei Schaufelmessern verschiedener Zahnbestückung und
• 9 eine schematische Darstellung von Grabquerschnitten mit in aufeinander folgenden vier Schaufelmessern verschiedener Zahnbestückung.

Further measures improving the invention are shown in more detail below together with the description of a preferred exemplary embodiment of the invention with reference to the figures. It shows:

• 1 a perspective view of a shovel with four shovel knives,
• 2 a plan view of a section of a paddle wheel according to the invention,
• 3 a perspective view of a portion of the paddle wheel according to the present invention,
• 4th a cross section through the paddle wheel,
• 5 a section of the paddle wheel in a side view,
• 6th the view of a shovel frame of a shovel designed according to the invention, on which several shovel knives are arranged,
• 7a a schematic view of the tooth engagement of a blade with cutting teeth according to the prior art,
• 7b a schematic view of the tooth engagement of a shovel with an arrangement of cutting teeth on two adjacent shovel knives,
• 8th a schematic representation of grave cross-sections with three consecutive shovel blades with different teeth and
• 9 a schematic representation of grave cross-sections with four consecutive shovel knives with different teeth.

1 Figure 3 shows a perspective view of a blade 12th that are on the base body 10 of a paddle wheel 1 can be arranged like this in 3 is shown in a perspective detail. The shovel 12th has a bucket frame 21 on the example of four shovel knives 13th are arranged. The shovel knives 13th extend across the bucket frame 21 with an arch shape, and on the shovel knives 13th are cutting teeth 14th arranged.

Two of the shovel knives shown 13th are each in the same way with cutting teeth 14th occupied, and neighboring shovel knives 13th each have different arrangements of cutting teeth 14th on. According to the invention are the cutting teeth 14th on adjacent blade knives 13th are received, arranged at least offset from one another, so that they are on circular paths offset in the direction of the impeller rotation axis 15th and 16 are movable when the paddle wheel 1 around its impeller rotation axis 11th rotates. Are exemplary of a number of cutting teeth 14th two first circular paths 15th and two second circular orbits 16 shown, each by connecting lines between cutting teeth 14th are formed that are not on adjacent paddle blades 13th are arranged. As a result, there is an offset between the circular paths 15th and 16 the cutting teeth 14th arises, the run on the following shovel knives 13th arranged cutting teeth 14th through respective tooth gaps 26th leading shovel knife 13th . This effect is exemplary with the cutting teeth 14 ' and 14 " shown and the tooth gap 26th is between the cutting teeth 14 ' shown working together on a leading shovel knife 13th are included, and the tooth gap 26th is subsequently passed through with the cutting tooth 14 " on the following shovel knife 13th .

2 shows a plan view of a section of the paddle wheel 1 with one in the direction of rotation R. Sequence of several shovel knives shown 13th . The view shows the arched design of the shovel knives 13th , on which the cutting teeth on the outside 14th are attached. The arc shape of the shovel knives 13th is determined by two side sections 19th leading to a shovel center 18th run towards each other. The side sections 19th have a direction of extent that coincides with the impeller axis of rotation 11th an angle of attack α includes, which is not reproduced to scale by the projection representation. The direction of extent is formed, for example, by a connecting line between the on a shovel knife 13th recorded cutting teeth 14th in the area of the side sections 19th . The angle between the projected direction of extent of the side sections 19th and the impeller rotation axis 11th is with α and has a value of 50 °, for example. Combined with 4th it becomes clear that the ratio of the shovel knife depth t and the bucket knife width b has a low value because of the arcuate shape of the shovel blades 13th compared to a U-shaped shovel 12th is very flat. The relationship between the shovel knife depth t and the bucket knife width b is only 0.2 to 0.4, for example.

Also in the plan view of the section of the paddle wheel shown 1 it can be seen that in the direction of rotation R. the position of the cutting teeth 14th on successive shovel knives 13th in the direction of the paddle wheel rotation axis 11th are arranged offset to one another. A total of two tooth configurations that are to be distinguished from one another are shown and, for example, there is a cutting tooth 14th on every other shovel knife 13th on the middle of the shovel 18th , and on every other shovel knife 13th are the cutting teeth 14th laterally offset to the middle of the bucket 18th recorded.

3 shows the paddle wheel 1 about half, and it can be seen that a large number of shovel knives 13th on the main body 10 of the paddle wheel 1 is recorded. There are several shovel knives 13th on the respective bucket frame 21 recorded, and neighboring shovel knives 13th each have cutting teeth 14th with different occupation positions.

The basic body 10 of the paddle wheel 1 has two parallel ring carriers 27 on, between which there are cross bars at regular intervals 28 extend. There are blade shells in the annular spaces formed in this way 24 through which the removed material enters the inside of the paddle wheel 1 is conveyed to finally get onto a conveyor belt of a bucket wheel excavator.

4th Figure 10 shows a cross-sectional view of the paddle wheel 1 with the main body 10 , on the circumferential shovel knife 13th are arranged, and inside are shovel shells 24 shown.

The shovel knives 13th have a shovel knife width b on, which is essentially determined by the maximum width with which the outer cutting teeth 14th on the shovel knives 13th are included. Furthermore, the shovel knives 13th a shovel knife depth t by the radial distance between the innermost and the outermost cutting tooth 14th on the shovel knives 13th is determined. The paddle wheel 1 extends around the impeller axis of rotation 11th and has a cutting circle diameter 20th due to the maximum diameter of the paddle wheel 1 is defined.

In 5 is a section of the paddle wheel 1 shown in a side view from which it can be seen that the respective blades 12th four shovel knives, for example 13th exhibit. The shovels 12th own bucket frames 21 on which the shovel knives 13th with the cutting teeth 14th are included. The bucket frames 21 are about bolt connections 29 at the ring bearer 27 arranged, and each shovel 12th has a shovel shell 24 on that in the direction of rotation R. four shovel knives 13th hurry ahead. A shovel knife 13th forms a main blade 13th and is with the shovel shell 24 connected.

6th shows the view of a shovel 12th from the bottom, making a shovel frame 21 can be recognized by the four shovel knives 13th are included. The bucket frame 21 has two longitudinal beams running approximately parallel to one another 22nd , between which there is a crossbar 23 extends so that the bucket frame 21 has a substantially H-shape. The shovel knives 13th extend approximately in an arc between the two longitudinal beams 22nd .

7a shows schematically the meshing of several cutting teeth 14th that according to the prior art on a shovel 12th are arranged, the arrangement of the cutting teeth 14th multiple blades 12th are equal to each other on a paddle wheel. Every cutting tooth 14th thereby solves an assigned grave cross-section 17th from the material association 25th , the grave cross-sections 17th each adjacent and in a row about the same height to each other. The shovel 12th is shown in the paddle wheel rotation axis 11th laterally against the material bandage 25th moved as indicated by a directional arrow. As a result, only cutting teeth get through 14th in engagement with the material bandage 25th that are at the side section 19th the shovel 12th are arranged. On the side section 19th are exemplary eight cutting teeth 14th per shovel 12th arranged at the same height to each other.

7b shows a shovel 12th with two shovel knives 13th so that the eight cutting teeth 14th according to 7a on the two shovel knives 13th are divided. Consequently, every shovel knife has 13th only four cutting teeth left 14th on that compared to the arrangement according to 7a greater distance to each other on the shovel knife 13th are arranged. The cutting teeth 14th on the two shovel knives, for example 13th are offset from one another so that cutting teeth 14th working on a common shovel knife 13th are recorded, not adjacent grave cross-sections 17th from the material association 25th solve. Only through the engagement of the cutting teeth 14th on the following shovel knife 13th are those between the grave cross-sections that were initially triggered 17th lying further grave cross-sections 17th triggered so that each cutting tooth 14th a defined grave cross-section 17th is assigned, which has a respective size with which a limitation of the maximum chunk size is achieved. In particular, it is achieved that the cutting forces acting on the cutting teeth 14th act, do not get too big, and the cutting teeth 14th can have a sufficient distance from one another.

the 8th and 9 show exemplary grave cross-sections 17th , like this one from the material association 25th can be triggered when three ( 8th ) or four ( 9 ) Shovel knife 13th are provided with different cutting teeth.

The embodiment of the invention is not limited to the preferred exemplary embodiment specified above. Rather, a number of variants are conceivable which make use of the solution shown even in the case of fundamentally different designs.

List of reference symbols

1

Paddle wheel

10

Base body

11th

Impeller axis of rotation

12th

shovel

13th

Shovel knife, main shovel knife

14th

Cutting tooth

14 '

Cutting tooth

14 "

Cutting tooth

15th

first circular path

16

second circular path

17th

Grave cross-section

18th

Blade center

19th

Side section

20th

Cutting diameter

21

Bucket frame

22nd

Longitudinal beam

23

Transom

24

Shovel shell

25th

Material bandage

26th

Tooth gap

27

Ring bearer

28

Crossbar

29

Bolt connection

b

Blade width

t

Shovel knife depth

α

Angle of attack

R.

Direction of rotation

Claims (8)

Bucket wheel (1) for a bucket wheel excavator for mining materials from a material composite (25), with a base body (10) which extends around a bucket wheel rotation axis (11) and on which several blades (12) with bucket knives (13) are distributed around the circumference ) are received and wherein a plurality of cutting teeth (14) are arranged on each blade (13), which can be moved on respective circular paths (15, 16) by rotating the base body (10) about the blade wheel rotation axis (11), the cutting teeth (14) , which are received on adjacent blade blades (13), are at least partially offset from one another, so that they can be moved on circular paths (15, 16) offset in the direction of the blade wheel rotation axis (11), the blades (12) at least two blade blades (13 ), one of the shovel knives (13) forming a main shovel knife (13) on which a shovel shell (24) is arranged, characterized in that the show feln (12) have shovel frames (21) on which the shovel blades (13) are received and wherein the blades (12) are detachably arranged on the base body (10), the shovel frame (21) having an H-shaped structure with two approximately parallel extending longitudinal beam (22) and a transverse beam (23) extending between the longitudinal beams (22), the shovel knives (13) being received on the longitudinal beams (22) and extending approximately arcuately between them. Paddle wheel (1) Claim 1 , characterized in that at least two, three, four or more shovel knives (13) with cutting teeth (14) arranged offset to one another are received in periodic succession in the circumferential direction of the base body (10), so that each cutting tooth (14) on mutually adjacent shovel knives ( 13) is assigned a separate grave cross-section (17). Paddle wheel (1) Claim 1 or 2 , characterized in that the shovel knives (13) are arcuate and have a shovel knife width (b) running in the direction of the bucket wheel rotation axis (11) and a shovel knife depth (t) running in the radial direction, the ratio of the shovel knife depth (t) to the shovel knife width (b) ) is a value from 0.1 to 0.7. Bucket wheel (1) according to one of the Claims 1 until 3 , characterized in that the bucket knives (13) have side sections (19) tapering towards the bucket center (18), the direction of extent of the side sections (19) including an angle of incidence (a) of less than 60 ° with the bucket wheel rotation axis (11). Bucket wheel (1) according to one of the preceding claims, characterized in that the bucket wheel (1) has a cutting circle diameter (20), the ratio of cutting circle diameter (20) to the bucket knife width (b) - in the case of bucket wheels (1) with a cutting circle diameter (20) ) of less than 7 m a value of less than 4, - for paddle wheels (1) with a cutting diameter (20) of 7 m to 13 m a value of less than 5, - for paddle wheels (1) with a cutting diameter (20) of 13 m to 18 m has a value of less than 6, and - for paddle wheels (1) with a cutting circle diameter (20) of more than 18 m has a value of less than 7. Bucket wheel (1) according to one of the preceding claims, characterized in that the buckets (12) have at least three bucket knives (13), one of the bucket knives (13) forms a main blade (13) on which a blade shell (24) is arranged. Bucket wheel (1) according to one of the preceding claims, characterized in that the bucket knives (13) are at a distance from one another in the direction of rotation (R) which corresponds to twice the main dimensions of the grave cross-sections (17) cut by the cutting teeth (14), so that a sieve function results from the distance between the shovel knives (13). Bucket (12) for a bucket wheel (1) for breaking down materials from a material structure (25), which can be arranged on a base body (10) which extends around a bucket wheel axis of rotation (11), with bucket knives (12) on the bucket (12). 13) and with a plurality of cutting teeth (14) being arranged on each shovel knife (13), which can be moved on respective circular paths (15, 16) by rotating the base body (10) about the paddle wheel rotation axis (11), the shovel (12 ) has a shovel frame (21) on which the shovel knives (13) are received and wherein the shovel (12) can be releasably arranged on the base body (10), the cutting teeth (14) being received on mutually adjacent shovel knives (13) , are arranged at least partially offset from one another, so that they can be moved on circular paths (15, 16) offset in the direction of the bucket wheel rotation axis (11), the bucket (12) having at least two bucket knives (13), one s the shovel knife (13) forms a main shovel knife (13) on which a shovel shell (24) is arranged, the shovel frame (21) having an H-shaped structure with two approximately parallel longitudinal beams (22) and one between the longitudinal beams (22) ) has extending crossbeams (23), the shovel blades (13) being received on the longitudinal beams (22) and extending approximately in an arc between them.

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