WO2015091120A1 - Grating tool - Google Patents

Abstract

The invention relates to a rotating grating tool (1), in particular for comminuting plant parts, preferably tubers such as potatoes or arrowroots, in order to obtain starch, having multiple grating blade arrangements which are inserted into grooves (5) provided for this purpose in a distributed manner on the circumference of a rotor (3). At least one or more of the grooves (5) has at least one respective grating blade arrangement provided with two or more grating blades (10a, 10b). According to the invention, at least one or both of the following features a. and b. is/are implemented: a. in the grating blade arrangement(s) with two or more grating blades (10a, 10b), each of which is arranged collectively in one of the grooves (5), each of the grating blades(10a, 10b) or in any case each of the grating blades which are adjacent in the circumferential direction are arranged in said groove (5) at an angle relative to one another, said angle being smaller than the groove (5) wedge angle α formed between the groove flanks (8a, 8b), and b. each of the two or more grating blades (10a, 10b) of the grating blade arrangement(s) are held in a radial manner in the respective groove (5) by at least one or more retaining means.

Description

 rasp

The present invention relates to a rasp tool according to the preamble of claim 1. Rotary rasping tools, e.g. for crushing plant parts, preferably tubers such as potatoes or manioc roots for starch production, are known in the art.

Thus, DE 86 28 366 U1 discloses a rotor for a mill or a rasp device, which has protruding, knife-like comminuting members over its circumference. The comminution organs - called rasp blades in the following - are inserted into slots which run parallel to the axis of rotation of the rotor and constrict outward, and are held in the slots by clamping pieces (see also FIGS. 12 and 13).

Basically, such rasp tools have proven themselves in practice. However, an increase in the productivity of such a rasp tool is desirable. For this purpose, EP 1 796 839 B1 proposes a rasp tool in which the rasp blades are inserted in grooves which have an undercut with a width which increases radially inwardly from the mouth of the groove, the grooves extending through axial sections with a predetermined length Minimum wall width are spaced from each other and have a defined radial depth. The minimum wall width of the compartments is calculated so that the minimum wall width is less than 60% of the groove depth. As a result of this measure, with a given outside diameter of the rasp tool, it is possible to arrange a larger number of rasp blades on the circumference of the rasp tool, since more grooves can be accommodated on the outer circumference. As a result, the productivity of the rasp tool according to EP 1 796 839 A1 over the rasp tool according to 86 28 366 U1 is increased with the same diameter and the same circulating frequency of the rasp tool. A disadvantage of the solution presented in EP 1 796 839 A1 is the relatively high machining outlay that is required if a comparatively larger number of grooves for receiving rasp blades are to be produced on the circumference than in the case of conventional rasp tools. Due to the increased production costs associated increased manufacturing costs.

In addition, from the prior art rasp tools - as shown in Figure 14 - known, in which each two rasp blades in a trapezoidal Groove are arranged on the circumference of a rotor. The rasp blades are - see Figure 14 - respectively at the flanks of the trapezoidal groove and are held by a spring which acts on a wedge-shaped jaw in the radial direction in the groove. A disadvantage of this solution is the cumbersome storage of rasp blades in the grooves. In addition, results from the nutflankenparallele arrangement of the rasp blades a significant angular deviation of the rasp blades to the radial direction of the rotor. This results in a rasp blade for a negative rake angle and for the other rasp blade a positive rake angle. As a result, one rasp blade tends to chafe, while the other rasp blade is more cutting. An uneven blade wear and a comparatively again not optimal productivity of such a rasp tool are the result.

The invention has the object to provide a rasp tool, which reduces at least a part of the disadvantages described.

The present invention solves this problem by the subject matter of claim 1. Is created - in particular by the feature a) of the characterizing part of claim 1 - a rasp tool in which by a high number of rasp blades or knives on the circumference and their advantageous arrangement, in particular in or nearly in the radial direction of the rotor, the productivity of Rasp tool is increased and the Zerspanungsaufwand is reduced to create grooves for the rasp blades. As a result, a relatively inexpensive and highly productive rasp tool is created in an advantageous manner, which can have a large number of blades and still a relatively large distance between adjacent grooves with respect to its outer circumference, which increases the stability of the roller. According to the feature b) of the characterizing part of claim 1, a rasp tool is also realized in which the rasp blades are supported in a simple manner supported by at least one constructive element and not solely by frictional engagement in the groove.

The objects of features a) and b) of the license plate are in each case inventive and advantageous, but can also be advantageously combined with one another. The term raspblades is not too narrow. It includes blades or saw blades with a variety of cutting and Sägekantenprofilen to understand.

In an advantageous embodiment of the present invention, each peripheral groove has three or more rasp blades. By doing so, the number of rasp blades in the rasp tool is further increased with respect to prior art rasp tools of the same diameter without increasing the manufacturing cost of the rasp tool by increasing the number of grooves to be machined.

In a further advantageous embodiment variant of the present invention, a spacer strip is located in each case between the two rasp blades. As a result, it is advantageously ensured even with two or more rasp blade per groove in the stationary state of the rasp tool easy to be solved frictional attachment of the rasp blades in the groove, which manages without further fasteners.

On the outer circumference of the rotor, preferably, all of the grooves are populated equally with rasp blade assemblies of rasp blades and jaws, e.g. in the manner of Fig. 4 or 9. However, it is also conceivable to realize mixed forms of different variants. Thus, a portion of the grooves - for example, in the circumferential direction of each second groove - be provided with rasp blade assemblies of rasping blades and jaws having only one rasp blade per groove and each intermediate groove with rasp blade assemblies with two or more rasp blades of the type of Fig. 4 or Grooves are occupied in the circumferential direction of the rotor, for example, alternately with rasp blade assemblies of the type of Fig. 4 or 9. Other combinations and variants of this idea, to mix the different embodiments of only one rotor, are conceivable. Further advantageous embodiments of the invention can be found in the dependent claims.

Embodiments of the subject invention are illustrated in the drawings and will be described in more detail below. Show it:

Figure 1 is a perspective view of a portion of an inventive

rasp; an enlarged detail of Figure 1, which illustrates in particular the order of the rasping blades on the circumference of a rasp tool according to the invention ..; a sectional view of an outer peripheral portion of a second rasp tool according to the invention; in a) a section of a section through a rasp tool according to the invention in the manner of FIGS. 1 and 2 and in b) a rasp blade arrangement of this rasp tool;

Figure 5 is a perspective exploded view of a rasp blade assembly of a rasp tool according to the invention, substantially in the manner of FIG. 4;

6 shows in a) a section of a section through a third rasp tool according to the invention and in b) a rasp blade arrangement of this rasp tool;

7 shows in a) a section of a section through a fourth rasp tool according to the invention and in b) a rasp blade arrangement of this rasp tool; FIG. 8 is a sectional view of a portion of a fifth invention

 Raspelwerkzeugs.

9 shows in b) a section of a section through a sixth rasp tool according to the invention and in a) a rasp blade arrangement of this rasp tool;

10 shows in a) a spatial exploded view of a rasp blade arrangement of a rasp tool according to the invention of the type of FIG. 9, and in b) this arrangement in a perspective view in an assembled state; Figure 1 1 in a) a section of a section through a seventh rasp tool according to the invention and in b) a rasp blade arrangement of this rasp tool;

Figure 12 is a perspective view of a rasp tool according to the prior

 Technology;

FIG. 13 is a partial enlarged view showing, in particular, the arrangement of the rasping blades on the circumference of a prior art rasping tool;

FIG. 14 shows an enlarged detail of a rasp tool after

 State of the art, each with two rasp blades per groove, the rasp blades are arranged Nutflankenparallel and are pressed radially outward by a spring against the groove flanks.

In Fig. 1, an inventive rasp tool 1 is shown. The rasp tool has a cylindrical rotor 2 which is rotatably mounted on an axis 3 in the region of clamping bushes by (not to be recognized) rolling bearings. The rotor 2 has grooves 5 distributed on the circumference of the rotor 2. The grooves 5 are parallel to the axis 3 of the rotor 2 over its entire axial width - eg. by a Zer- spanungsprozess- incorporated in the rotor 2.

The grooves 5 have a basic cross-section in the form of a substantially isosceles trapezium, wherein the groove opening 6 is dimensioned smaller in the circumferential direction of the rotor 2 than the groove bottom 7. The two trapezoid flanks 8a, 8b close starting from the outer periphery of the rotor 2 via a radial portion preferably initially radially inwardly toward a substantially constant wedge angle. The edge formed from the groove base 7 and the groove flanks 8a, 8b is rounded with a radius to reduce stress. Likewise, the groove bottom 7 has a curvature, which also has a voltage-reducing effect.

At least one or more or each groove (s) 5 of the rasp tool 1 according to the invention has / each have a rasp blade arrangement with two or more rasp blades 10a, 10b each. In the rasp tool 1 shown in FIG. 2, each groove 5-in a preferred embodiment-has two rasp blades 10a, 10b. The two rasp blades 10a, 10b of the rasp blade assembly are each clamped by a jaw 1 1, 12 laterally and a spacer bar 13 between the two rasp blades 10a, 10b.

The jaws 1 1, 12 are supported on the groove flanks 8 a, 8 b of the groove 5 via a surface contact and lie with their side facing away from the nutflanken each at a rasp blade 10 a and 10 b. There is a spacer strip 13 between the rasp blades 10a, 10b.

The two or more rasp blades 10a, 10b are arranged at an angle to one another which is smaller than the wedge angle of the groove 5 enclosed between the groove flanks 8a, 8b.

Preferred geometrical relationships become clear from FIGS. 3 and 4. Accordingly, it is advantageously provided according to a variant that the Raspelklingenanord- calculations, which consists of the jaws 1 1 and 12, the rasp blades 10 a, 10 b and the spacer bar 13 and the rasp blades forms a substantially symmetrical assembly. This is advantageous because manufacturing is facilitated but not compelled (-d?). Accordingly, the line of symmetry of the rasp blade attachment preferably coincides with the line of symmetry (viewed in the circumferential direction of the rotor 2) of a likewise preferably symmetrically formed groove 5 in the mounted one. Both lines of symmetry and planes-the groove 5 and the rasp blade arrangement-preferably intersect the center of the rotor 2 as radial R or radially extending planes. According to a first advantageous variant, the rasp blades 10a or 10b (as precisely as possible) are possible ) radially to align or align (Fig. 3).

However, it is also advantageously possible to arrange them parallel to one another (FIG. 4). Preferably, then one of the two rasp blades 10a, 10b lies in a plane which extends radially through the center of the rotor (or the roller). In the latter case, the rasp blades 10a and 10b form an angle of 0 °. But so both rasp blades are still aligned approximately radially. It is also conceivable that both knives are not exactly radial but the straight line of the center line (or the groove) between the parallel knives.

Intermediate positions in which the rasp blades enclose an angle between 0 ° and α are also advantageously feasible. This will each be more advantageous Cut results achieved than in the prior art. However, the positions of FIGS. 3 and 4 are particularly advantageous.

Due to their inertia in the radial direction, the clamping jaws 1 1, 12, the rasp blades 10 a, 10 b and the spacer 13 are pressed outwardly or in the direction of the slot opening 6 in the radial direction by the rotating rotor 2. Due to the wedge angle enclosing groove flanks 8a, 8b and the geometrically corresponding surfaces on the clamping jaws 1 1, 12, the rasp blades 10a, 10b experience a corresponding clamping force which, according to the wedge principle, is greater in magnitude than the respective centrifugal force. This results in a (in Fig. 2 alone and according to FIGS. 3 and 4 supplementary) frictional, in the rest position of the rotor 2 for the change or rotation of the rasp blades 10a, 10b easily removable connection, which requires no further fasteners.

Since the life of the rasp blades 10a, 10b is limited, a simple and quick disassembly of the rasp blades 10a, 10b is required to minimize unproductive downtime of a rasp tool 1.

Each rasp blade 10a or 10b preferably has a rectangular base cross-section with a total of strip-shaped basic geometry. Furthermore, the rasp blade 10 a or 10 b has in each case on its two narrow sides, which extend in the radial direction of the rotor 2, a cutting edge, a saw contour or serrated recesses 14. The webs between the recesses then act as cutters and rasp the products used, e.g. Tubers, preferably potatoes or cassava roots. The rasp blades 10a, 10b are used together with the jaws 1 1, 12 and the spacer bar 13 in the groove 5, that the rasp blades 10a, 10b extends radially at least by the amount of the depth of the recesses 14 on the circumferential line of the rotor 2.

FIGS. 3 and 4 and 5 each show a second type of rasp blade fastening of a rasp tool 1 according to the invention. At least one or more retaining means are provided which hold the rasp blades 10a, 10b of the rasp blade assemblies (see, e.g., Fig. 4b) against the jaws so as to be additionally radially secured in use. These holding means can be realized in various ways.

The rasp blades 10a, 10b, the spacer strip 13 and at least one jaw 1 1, or 12 or all of these elements have according to Fig. 3, 4 and 5, respectively one or preferably two or more in the longitudinal direction or axial direction of the roller spaced corresponding aligned or in flight mountable holes 9, which are each penetrated by a mandrel 15 as the holding means in the assembled state of the rasp blades 10a, 10b. Notwithstanding the embodiment shown in FIGS. 3 and 4, according to FIG. 6, in a further optimized variant of the holding means, at least one of the clamping jaws 1 1 or 12 has one or more mandrels 15 fixedly connected to the clamping jaw 1 1 or 12. The fixed connection between each mandrel 15 and one of the clamping jaws 11, 12 can be produced, for example, by means of a material connection, in particular a soldering or welding connection 16. Alternatively, a frictional connection is conceivable, for example, a compression or another clamping seat. Thus, the assembly and disassembly of the individual rasp blade assemblies is further simplified. Because of the mandrel 15, the position of the razor blades 10a, 10b, the spacer strip 13 and the second clamping strip 1 1 or 12, which are lined up on the mandrel 15, are predefined relative to the slot opening 6 or the circumferential line of the rotor 2.

As a result, the rotation or change of the rasp blades 10a, 10b is facilitated and considerably accelerated, since complex adjustment or alignment of the position of the corresponding components 10a, 10b, 11 and 12 and 13 relative to each other and to the peripheral line of the rotor 2 and Slot opening as a common reference and the removal and replacement in the corresponding groove 5 can be omitted after each adjustment or alignment process. In addition, the elements of each rasp blade assembly of the blades and the holding or fastening means of the blades to the

Clamping jaws and spacer strips in the groove particularly securely held together during rotations of the roller.

Alternatively, the at least one spacer strip 13 with its firmly connected mandrel 15 may have. This is shown clearly visible in FIG. Accordingly, in the case, the rasp blades 10a and 10b and the jaws 1 1 and 12 respectively lined up on both sides of the at least one mandrel 15, so that there is a symmetric see Raspelklingenbefestigung. The fixed connection of the at least one dome 15 with the spacer strip 13 can be made, for example, not only by a welding or soldering connection but also in other ways such as a press connection. Preferably, a mandrel and bores 9, that is, a total of axially or in the longitudinal direction of the rasp blade assembly two or more mandrels and corresponding aligned holes 9 are provided at different axial locations of the rasp blade assembly. As a holding means could also be provided instead of the bolt, for example, projections on the jaws and / or spacer strips which engage positively in holes or recesses of the rasp blades (not shown).

Fig. 7 illustrates that the shape of the grooves 5 for the rasp blade assemblies can also be designed in other ways than in the previously considered Fig. 1 to 6 or Fig. 8. Thus, one or more or even each of the groove (s ) 5 radially inwardly expand faster less than the grooves 5 of Fig. 1 to 6. The widest point in the circumferential direction of the grooves 5 is in Fig. 7, although still relatively far radially inside. Only the grooves 5 by the radially from outside to inside relatively quickly radially (ie, less than 50% of the radial depth or extent of the grooves 5) no longer constant but decreasing groove angle α at its widest point in the circumferential direction B1 narrower than that Grooves of Fig. 1 to 6 at its widest point B2, so that B1 <B2. The groove angle of the grooves 5 of Fig. 7? is not constant up to its widest point in the circumferential direction, but shrinks inwards even before this point.

On the outside, the angle between the groove flanks α of the groove 5 of FIG. 7 is the same as in FIGS. 1 to 6, where the groove angle α but constant up to the widest point in the circumferential direction of the grooves 5, which is radially very far inside, in particular deeper than at a depth of 70% of the radial extent of the grooves 5 from the outer periphery of the rotor 2 inwardly. Although the same rasp blade arrangements as in FIGS. 1 to 6 can still be used due to the contour of FIG. 7, more grooves could be arranged on the outer circumference than in FIGS. 1 to 6, even if this is not the case in FIG is shown. The radius of the machining tool (for example, a milling disc), which produces the bottom of the groove for making the groove is according to Fig. 7 but larger than in FIG. 1 to 6. With the larger radius power flow and strength at the outer diameter are advantageously optimized , In principle, rasp blade arrangements with more than one rasp blade 10a, b are suitable for grooves 5 of very different geometries, even if the geometries shown appear to be particularly advantageous.

According to FIG. 8, it is provided that three rasp blades 10 a, b, c are provided in at least one or more of the grooves 5. For this purpose, a third rasp blade 10c is set between two rasp blades 10a, b arranged on flanks of the groove. Preferably, the third rasp blade 10c is placed centrally between the two outer rasp blades 10a, b, and more preferably, it is arranged radially aligned there. Although the two outer rasp blades 10a, b in this groove. 5 then still aligned relatively obliquely to the radial. However, the further rasp blade 10c arranged between the two outer tools 10a, b still results in a further optimized cutting result due to the very high rasp sound density on the outer circumference of the rotor 2. Preferably, the two or more rasp blades also have bores 9 and the clamping jaws 1 1, 12 corresponding holes 9, which in turn are penetrated by a mandrel 15 in the assembled state of the rasp blades 10 a, 10 b, 10 c. This at least one mandrel 15 can also engage with the outer rasp blades 10a, projecting ends 19, 20 in grooves 17, 18, which are formed in the groove flanks substantially in the circumferential direction. The rasp blade assemblies consisting of the rasp blades 10a, b, c and the clamping jaws 11, 12 are pulled axially out of the corresponding groove 5 during a blade change and inserted into them again. In this way, the rasp blades 10a, b arranged on the groove flanks are also held securely in the grooves 5 on the groove flanks. The grooves 17, 18 have radially preferably at least such a large extent that the clamping jaws 1 1, 12 are pressed with the rasp blades 10 a, b, c during rotations of the rotor 5 radially outwardly into a clamping fit, in which the radially outer ends the rasp blades protrude radially beyond the outer circumference of the rotor. In each case adjacent rasp blades 10a, 10b or 10b and 10c also include an angle smaller α.

In another type of arrangement with three rasp blades or in an arrangement with four rasp blades, in addition to the exemplary embodiment of FIG. 8, a further spacer strip 13a, 13b would be provided. The exemplary embodiment with four rasp blades would then, for example, preferably supplement the embodiment of FIGS. 1 to 5 by two further rasp blades in the region of the groove flanks. Referring to Figure 9, three rasp blades are also provided in one, several or all of the rasp blade assemblies. Reference is made to FIGS. 9a and b for this purpose. As can be seen, these three rasp blades 10a, 10b, 10c are arranged parallel to one another and parallel to one of the groove flanks 8b in their radially outer regions. Thus, all of the rasp blades 10a, 10b, 10vc are aligned at an acute angle β relative to the radial R, for which the following preferably holds: 0 ° <β <40 °. Preferably, furthermore, β = a / 2. Each rasp blade assembly are here preferably a terminal block 1 1 and then laterally next to a first rasp blade 10a, then a first spacer bar 13a, then another rasp blade 10b, then a further spacer bar 13b and then a further between this spacer bar 13b and the groove flank 8b further rasp blade 10c intended. There are also bores 9 and mandrels 15 again provided and here also a welded joint 1 6 between thorns 15 and the one terminal strip (see also Fig. 10), but the holding can also be realized in other ways.

Since all the blades are at an acute angle to the radially aligned, arises here - depending on the orientation in or against the direction of rotation of the roller (= rotor) - a modified cutting and rasping behavior, which may be advantageous in certain applications.

According to FIG. 11, the rasp-blade arrangement known per se from FIG. 14 is further developed in that a resilient radial support of the spacer 13 between the two rasp-blade blades resting against the groove flanks 8a, 8b is dispensed with. Preferably, each of the rasp blades 10a, 10b is held here by frictional engagement and clamping force during rotations of the rotor 2 on the groove flanks 8a, 8b. The rasp blades 10a, 10b extend parallel to the groove flanks 8a, 8b and enclose the groove angle α.

LIST OF REFERENCE NUMBERS

1 rasp tool

 2 rotor

 3 axis

4 clamping bushes 5 groove

 6 slot opening

 7 groove base

8a, b groove edges

 9 hole (10a, b, c rasp blades 1 1 jaw

 12 jaw

 13 spacer strip

 14 recess

 15 thorn

16 welded joint

 17, 18 channels

 19, 20 ends

α wedge angle

 R radial

r radius

Claims

claims Rotating rasp tool (1), in particular for shredding plant parts, preferably tubers, such as potatoes or manioc roots, for the production of starch, comprising a plurality of rasp blade arrangements, which are distributed around the circumference of a rotor (2) and provided in grooves (5) which have a slot opening (5). 6), a groove base (7) and groove flanks (8a, 8b), said rasp blade assemblies having one or more rasp blades (10a, 10b) by at least one jaw (1 1, 12) or a spacer (13) in the Groove (5) are fixed and wherein one of, more or all of the rasp blade assembly (s) two or more rasp blades (10a, 10b), characterized in that at least one or both of the following features a. and b. is fulfilled / are:  a. in the rasp-blade arrangement (s) with two or more rasp-blades (10a, 10b), which are respectively arranged together in one of the grooves (5), all or at least circumferentially adjacent rasp-blades (10a, 10b) are each in this groove ( 5) at an angle relative to each other, which is smaller than the between the groove flanks (8 a, 8 b) included wedge angle of the groove (5), and  b. the two or more rasp blades (10a, 10b) of the rasp blade rotor (s) are each held radially in the respective groove (5) with at least one or more retaining means. Rotary rasp tool (1) according to claim 1, characterized in that the two or more rasp blades (10a, 10b, 10c) as the holding means at one or more axial locations holes (9) and the jaws and / or spacers (1 1, 12 , 13) have one or more corresponding bores (9), which in each case are penetrated by a mandrel (15) in the assembled state, Rotating rasp tool (1) according to claim 2, characterized in that the mandrel (s) each (15) on one of the clamping jaws (1 1, 12) or on the one or more spacers (s) (13 a, b) is pre-assembled (are), in particular by an adhesion and / or a frictional connection. Rotary rasp tool (1) according to claim 2 or 3, characterized in that each mandrel (15) with one or two over the outer rasp blades 10a, projecting end (s) (19, 20) in one or more grooves (17, 18) engages (s) formed in the groove flanks substantially in the circumferential direction / are. A rotating rasp tool (1) according to any one of the preceding claims, characterized in that each of the grooves (5) comprises two or more of the rasp blades (10a, 10b). A rotating rasping tool (1) according to claim 5, characterized in that one, several or each of the grooves (5) comprises three or more of the rasp blades (10a, 10b). Rotating rasp tool (1) according to one of the preceding claims, characterized in that the two or more rasp blades (10a, 10b) are each arranged on a radial (R) of the rotor (2), or an angle greater than 0 ° and smaller Include wedge angle of the groove (5). Rotating rasp tool (1) according to one of the preceding claims, characterized in that the two or more rasp blades (10a, 10b) are arranged parallel to each other. Rotating rasp tool (1) according to one of the preceding claims, characterized in that the two or more rasp blades (10a, 10b) are arranged parallel to a radial (R) of the rotor (2). Rotating rasp tool (1) according to one of the preceding claims, characterized in that the two or more rasp blades (10a, 10b) are arranged along radials (R) of the rotor (2). 1 1. Rotating rasp tool (1) according to one of the preceding claims, characterized in that the two or more mutually parallel rasp blades (10a, 10b) at an acute angle at an angle 0 ° <<40 ° relative to the center through the running in the circumferential direction of the respective rasp blade assembly radials (R) of the rotor (2) are arranged. 12. Rotary rasp tool (1) according to one of the preceding claims, characterized in that between the two or more adjacent rasp blades (10a, 10b) is in each case a spacer strip (13). 13. Rotary rasp tool (1) according to any one of the preceding claims, characterized in that the groove opening (6) in the circumferential direction of the rotor (2) is dimensioned smaller than the groove bottom (7). 14. Rotary rasp tool (1) according to one of the preceding claims, characterized in that the groove (5) or the grooves (5) has or have a basic cross-section in the form of an isosceles trapezium. 15. Rotary rasp tool (1) according to any one of the preceding claims, characterized in that one or more or all of the grooves (5) have a base cross-section, in which the angle (a) enclosed by the groove flanks (8a, 8b) becomes smaller radially from outside to inside even before the circumferentially widest point of the groove. 16. Rotary rasp tool (1) according to one of the preceding claims, characterized in that the groove (5) or the grooves (5) has or have a basic cross section in the form of a circle or oval. 17. Rotary rasp tool (1) according to any one of the preceding claims, characterized in that the two or more rasp blades (10a, 10b) and the clamping jaws (1 1 and 12) at one or more axial locations aligned holes (9) by at least one Mandrel (15) in the assembled state of the rasp blades (10 a, 10 b) are penetrated. 18. Rotating rasp tool (1) according to the preamble of Anspruchsl or according to one of the preceding claims, characterized in that two of the rasp blades (10a, b, c) are provided per groove, wherein the two rasp blades on the groove flanks (8a, 8b) wherein the groove (5) are arranged and wherein between the two rasp blades (10a, b) a spacer strip (13) is arranged and wherein the two rasp blades (10a, 10b) frictionally and in particular non-resilient radially in operation during rotations of the rotor (29 secured are. 19. Rotary rasp tool (1) according to any one of the preceding claims, characterized in that two of the rasp blades (10a, b, c) are provided per groove, wherein between two on the groove flanks (8a, 8b) of the groove (5) arranged rasp blade (10a, b) at least a third rasp blade (10c) is arranged.