EP3381563A1 - Chipper rotor - Google Patents

Abstract

A hacking rotor (2) for producing wood chips with a shaft receptacle (4) is described which has at least three, preferably six circumferential and axially spaced radial webs (6) on which knife holders (8) are mounted, characterized in that two fixings At least one knife holder (8) is mounted in such a way that it freely spans a third web (6) arranged between the two fixing webs (6), whereby a chip space (10) extends underneath the knife holder (8). of an axial length over three successive webs (6) of time forms.

Description

The present invention relates to a hacking rotor of a comminuting machine, preferably a wood chopper, for producing wood chips according to the preamble of claim 1 and, more particularly, to a hacking rotor of a generic comminuting machine comprising webs / ribs / disks (circumferential webs) spaced circumferentially in the axial direction. -rippen / -scheiben). On / on two axially spaced webs / ribs / discs at least one blade holder / cutter holder is mounted so that it spans another, intermediate web / rib / disc (free).

Background of the invention

In principle, wood chips can be produced from a very wide variety of materials, e.g. Plastic or metal chips for recycling plastic / plastic material or scrap, but wood chips are usually associated with wood chips, for example, as fuel for heating systems or as a base material for pressboard. A crushing machine such as a shredder or a wood chipper grinds it by means of blades as a cutting tool, which are attached to a chopping rotor, to which the raw material to be shredded is fed by means of suitable conveying or feeding devices.

In principle, the starting material to be chopped is supplied by means of the feed device, for example by means of a conveyor belt, conveyor rollers or just by gravity to the chipping rotor, so that the chopping rotor removes small pieces of the starting material, for example tree trunks or shrubs. Will the starting material in the shredder or hacker (sometimes too Shredder), this is dissolved by grinding, crushing, ripping, smashing or cutting into small pieces. The result is called shredder / wood chips, in the case of biomass, in particular wood and wood chips, wood chips, wood chips or wood chips.

Crushing machines with a hack rotor of the present type can be used for the production of wood chips of various sizes. These machines thus come in the most varied forms and designs. The plow rotor with its blades mounted thereon is one of the core elements of the crusher and arranged in a (preferably soundproof) housing to provide protection against accidental contact but also against flying parts. A shaft drives the chopping rotor by means of a rotary drive, preferably an electric or internal combustion engine.

As a characteristic of a crushing machine, in addition to the amount of production of wood chips per unit time (chopping power), ie the speed at which the shredder produces a certain volume of wood chips, also the size and possibly dimensional accuracy of wood chips, a significant feature of a crushing machine, plays a major role , In addition, the higher the production quantity per unit of time, the lower the production costs, of course, and the larger and more accurate the setting range with respect to the size of the wood chips, the better the quality of the woodchips It is also important that the dimensional accuracy of the produced wood chips meets certain requirements.

The chopping rotor and in particular the blades are exposed to very high mechanical loads, for example, by unintentionally introduced stones or metal or hardwood, and are therefore subject to high wear. Due to the wear, the rotor blades therefore often have to be replaced, which has the consequence that the blades and thus the whole system again set elaborately and need to be calibrated. Of course, the work and time required for this should be as low as possible.

In previous systems, the crushing machine for the maintenance of the hacking rotor has to be processed comparatively complex and time-consuming by a specialist. A person skilled in the art may need several hours for this, resulting in a long service life of the machine and high personnel costs due to the need for trained personnel.

State of the art

In the European patent application EP 2 233 260 B1 discloses a device for crushing wood. This device for comminuting wood has a rotor with at least two spaced apart in Rotorachsrichtung and coaxially arranged (parallel) rotor disks (ribs / webs), wherein on each two directly adjacent rotor disks at least one releasably secured to the rotor disks knife carrier is provided, the Gap between the two adjacent rotor disks bridged. In turn, at least one knife is detachably mounted on this knife carrier, wherein the knife carrier rests on receptacles provided peripherally on the rotor disks and is fastened detachably to the rotor disks or to their disk backs with a fastening, preferably screws, oriented transversely to the holder. The knives arranged on the knife carrier at least partially cover the fastening means (screws) of the knife carrier. The knife carrier, as well as the knife, at least approximately the outer distance between two adjacent rotor disks corresponding width.

In the prior art, in crushing machines of this type, the chip space is radially closed axially under the cutters / knives on one side due to their design, because there the blade holder / knife carrier or the cutting edge rests directly on a web. Due to the axially closed design and the various materials that can possibly get into the crushing machine, for example stones, metal or hardwood, this space can clog radially under the respective blade holder and make a manual cleanup necessary. The clogging material pushes the starting material away from the blade upon rotation of the rotor and prevents the blade from sufficiently contacting the starting material (reducing the depth of cut), thereby decreasing the efficiency of the machine and requiring service life.

The present invention has for its object to provide a hacking rotor that requires the lowest possible service life, be it for maintenance, adjustment or repair. Thus, in case of damage, a quick repair or replacement of the components should be made possible. Also, the invention should preferably reduce the risk of clogging of the chip space as defined above.

Brief description of the invention

A hacking rotor for the production of wood chips according to the present invention has to solve the above object (s) a hack rotor having a number, preferably at least three, more preferably six (at least partially) circumferential and axially spaced / parallel webs / ribs / rotor discs , Between three webs at least one knife holder with a detachably mounted thereto knife and possibly a detachable knife cover is mounted such that the knife holder is preferably fixed by overvoltage of a middle / intermediate web located on the two axially outer of the three webs by means of screws, so a Cutting width substantially axially over three webs away allows. Preferably, a radial gap is formed between the radial underside of the knife holder and the back of the intermediate disc, so that the chip space is expanded radially below the respective knife holder in the axial direction. The risk of constipation is thereby reduced.

The chopping rotor roughly consists of a cylindrical body, preferably of steel, with an axially continuous opening in the middle of the cylinder (axial through-hole) designed to receive a drive shaft of any shape, by which the chipping rotor is made to rotate.

The axially spaced parallel flight lands / ribs / disks extend from the shaft seat / cylindrical body, i. away from the cylinder axis radially outward. They are preferably designed in the form of discs of predetermined slice thickness, which are mounted on the shaft mount (soldered, welded, integrally formed) and which are at least partially round in a cross-section. The webs preferably run closed once around the shaft holder / the cylindrical base body. Alternatively, they extend in a circle-segment-like manner around the shaft receptacle / cylindrical basic body. The webs are arranged at a distance from each other and parallel. In other words, the webs are spaced in the rotor axis direction and arranged coaxially with each other. Between the webs thus extending grooves or gaps are formed in the circumferential direction, which also extend completely around the shaft receiving around.

The / each knife holder consists of a knife holder surface and two knife holder blocks / mounting sections, which are connected on both sides of the knife holder surface / formed, preferably welded. Particularly preferably, the knife holder blocks / mounting portions and the knife holder surface are made of a single component. In the knife holder surface, a recess / recess is introduced, which receives the knife, on which in turn preferably a knife cover is mounted to give the radial top of the knife a convex curve. The blade cover has at least one, preferably two holes, which contain or receive screws, rivets or similar fastening means. The at least one fastening means is by at least one through hole in the knife / Cutting edge through the blade holder surface in the recess connected by screwing technology.

The ridges are arranged such that at least one knife holder stretched between two ridges spans a third (intermediate) ridge, preferably flattened below the spanning knife holder, to define a radial gap between itself and the radial underside of the knife holder form (chip space). At the webs more than one knife holder per bridge can be attached. If several knife holders are attached to a web, the knife holders distribute evenly on the surface of the web in its circumferential direction. For example, the blade holders are 180 degrees apart in two blade holders, 120 degrees in the case of 3 blade holders, 90 degrees in the case of 4 blade holders, and so on in the sense of a logical row. The arrangement of the knife holder in the rotor is that at least one knife holder is fixed to a first and a third web and spans the intermediate second web. At four webs at least one knife holder is fixed to the first and third web and spans the second web, wherein at the second and the fourth web at least one further knife holder is arranged at a circumferential distance from the first knife holder, which then spans the third web, and so on , With a higher number of webs, the further structure (in the manner of a staircase) is analogous.

The two fixing webs are to be understood as meaning the two webs, to each of which a knife holder block of a knife holder is fastened. In other words, the fixing webs are the webs between which the knife holder is stretched or mounted.

An overstretched web is understood to mean the web which extends radially below the knife holder and axially between the fixing webs with respect to the respective knife holder. In other words, the spanned web is the central web, which is arranged between the webs, which have a knife holder block and between which thus a knife holder is mounted or mounted. In again In other words, the chip space of the spanned web extends radially under the knife, which is located on the knife holder, which is supported by the two axially outer webs, which ultimately limit the respective chip space axially.

Advantageous in a design of a chopping rotor as set forth above, the radial accessibility of the fastening means, such as the screws, by means of which the knife holder and the knife cover are attached to the respective web. As a result, the mentioned elements are easy to remove and change, for example, in case of damage.

The webs of the chopping rotor each have recesses / flats on the web back for receiving the at least one cutter holder block / knife holder block (also called log). The recesses for the knife holder block are preferably rectangular in the webs introduced, preferably by milling. A rectangular shape ensures the best power transmission in the circumferential direction in the direction of rotation but also in the opposite direction. The recesses in this case have radial bores with threads in which the screws with which the blade holder block is attached to the web, can be introduced. But it is also an alternative attachment of the (Messerhalte-) blocks by welding, soldering, rivets or the like possible. The side walls of the recesses and the bottom surface of the recesses are connected by rounded corners, preferably at 90 degrees angle. The dimensioning of the individual wells is adapted to the designated blocks so that the blocks sit as possible without play in the wells to be able to initiate forces acting optimally in the circumferential direction in the webs can. But it is also possible in principle to attach the blocks without depressions directly to the back of the webs.

The blocks are mounted in the recesses by means of a releasable connection. Preferably, the blocks are screwed into the recesses of the webs, they can but also be attached by means of other releasable connections to the bridge. The detachable connection allows quick replacement of the blocks. In special cases, the blocks can also be attached to the webs by means of non-detachable connections such as welding or soldering.

The number of holes in the blocks is characteristic of the respective block. Characteristic in the sense that an algorithm is recognizable in connection with the number of holes. In a preferred embodiment, four holes are thus mounted in each blade holder block, for example. By the number of holes in a case in which knife holder blocks of different sizes are present on a pecking rotor, only the respective, intended for this purpose log into the appropriate, appropriate depression are introduced (Poka-Yoke principle). Due to the number of holes, the assignment is already visible to the user at first glance. Thus, a confusion is excluded and a faulty installation of the wrong blocks in the wrong place not even possible.

The spanned web is open to the direction of rotation and the opposite direction and thus forms under the knife holder open in the circumferential direction of the rotor chip space, preferably with a wave-shaped chip guide surface.

A chip space (or chip chamber) is a space under the knife. It serves to receive the separated material and conveys this during rotation out of the hack rotor. The open in the circumferential direction chip space of the invention preferably has only one corner / edge, where the cutting upstream web surface of the spanned web merges into the clamping space and in the chip space forming flattening of the spanned web. The otherwise cornerless spine of the spanned web in the region of the chip space is preferably formed in wavy or rounded design and thus prevents wedging of the wood chips. This favors the chip removal or chip removal from the Chip space, which allows a higher rotational speed and thus a larger production volume per unit time.

In this case, it is advantageous if the intermediate web, that is to say the web spanned / bridged by the knife holder, is defined / delimited by a radial edge running down to the shaft receptacle, that is to say an edge extending in the radial direction of the chopping rotor, and thus in the circumferential direction Disk fragment / a partial disk represents to increase the volume of the chip space. The previously presented soft transition between the spanned web and the chip space is not desirable in this embodiment to form the chip space as large as possible hollow volume, which allows a corresponding woodchip comminution and minimizes the risk of woodchip backlog in the chip space.

In particular, if the wave recording in the area of the chip space is removed / cut / cut off on the circumference in such a way that it forms a chip space floor as a straight / flat plane, the goal of the chip space enlargement is continued. This straight plane, which thus has no or only a minimal curvature, is orthogonal to the radial direction of the chopping rotor. The plane / Spanraumgrund extends substantially over the entire axial distance between the knife holder supporting fixing webs.

The fixing webs have passage openings extending in the axial direction, which are preferably arranged in the region where the chip space is located at an adjacent web. As a result, the respective chip space in the axial direction is not completely closed by the respective fixing webs but remains permeable to the chips by the above-mentioned passage openings. These openings are preferably round, but they can also have any other shape and be realized by milling or the like. These openings have two effects:

Thus, first, the weight of the rotor is reduced by these holes, which reduces the moment of inertia when starting the rotor, and thus makes the chopping rotor when starting accelerated and, above all, more energy efficient. The second effect is that, in the case of clogging of the clamping space, an iron rod or the like for releasing the clogging can be passed through the through holes, thus substantially facilitating engagement in the clogged clamping space.

The knife holder of the chopping rotor has a recessed blade receptacle for receiving the knife and the blade cover, which has a stop at its end facing away from the direction of rotation, which supports both the knife and the blade cover.

In other words, the cutting / blade holder has a recess for receiving the knife and its blade cover, wherein the recess is introduced from the direction of rotation facing the end of the knife holder up to the stop in the knife holder. The fact that the stop supports both elements in the direction of rotation, both the knife cover and the knife, increased security against knocking by the starting material or hard foreign bodies such as iron or stones can be achieved. The back of the knife and the blade cover are based on the stop of the blade holder in order to transfer the power optimally. The knife is preferably made of a very hard material and the knife cover made of a slightly softer but still hard material. This allows to save costs. On the other hand, it is particularly preferable to make only the blade / blade of a very hard material and the remaining body of the blade of a softer material, since it is protected by the blade holder and the blade cover.

Each web preferably receives at least one knife holder block, and more preferably two diametrically opposed. The knife holder has in particular holder protection plates, which consist of a harder material than the Knife holder itself, the holder protection plates are preferably soldered or welded. The knife holder is equipped on its radially outwardly directed surface with the plates or holder protection plates. The plates cover the entire surface of the knife holder with the exception of the surface section at which the knife is to be placed. The plates are arranged on the side facing the starting material. They thus protect the knife holder from wear.

Figur 1

zeigt eine erste Ausführungsform eines Hackrotors in einer perspektivischen Ansicht.

Figur 2

zeigt die erste Ausführungsform des Hackrotors in einer weiteren Ansicht.

Figur 3

zeigt den Hackrotors mit mehreren Spanräumen.

Figur 4

zeigt einen Messerhalter perspektivisch dargestellt.

Figur 5

zeigt eine Vertiefung perspektivisch dargestellt.

figure description

FIG. 1

shows a first embodiment of a chopping rotor in a perspective view.

FIG. 2

shows the first embodiment of the chopping rotor in another view.

FIG. 3

shows the chopping rotor with several chip spaces.

FIG. 4

shows a knife holder shown in perspective.

FIG. 5

shows a recess shown in perspective.

In FIG. 1 a Hackrotor 2 is shown in (perspective) frontal view. From a central shaft receiving 4, annular disk-shaped webs / ribs 6 extend radially away from the axis of rotation along the shaft receiver 4. The webs 6 are spaced apart in the direction of rotation axis and are preferably aligned plane-parallel to each other. Essentially plate-shaped knife holder 8 are attached / screwed to the webs 6 at their web backs, which are composed of a respective knife holding block 26 per axial end section of a web 6 and a knife holding surface 24 arranged between the knife holding blocks 26. The knife holder 8 are such that in the axial direction between the (fixing) webs 6 in the circumferential direction offset another web 6 runs, so they span it, so to speak. More precisely, the knife holders 8 span a so-called chip space 10 radially below the knife / a cutting edge 28 or below the knife holder 8, which chip space 10 by a the intermediate web 6 in a part-circular shape defining radial edge 40 and the above bridging knife holder 8 is formed / defined. The knife holder 8 are releasably secured by screws to the axially outer webs 6, which can also be referred to as fixing webs for the respective knife holder 8.

The central shaft receiver 4 is designed and adapted to be rotated by a shaft. The shaft receptacle 4 is preferably designed as a hollow cylinder. At the shaft receiving the webs 6 are attached / formed. Furthermore, the shaft holder 4 has badges 12 in the free spaces between the webs 6, which extend rib-like partially in the circumferential direction. Sickles 16 or crescent-shaped spacers can be mounted on the badges 12, which convey the wood chips radially out of this upon rotation of the chopping rotor 2. The free spaces between the webs 6 are referred to as ring groove 14.

The webs 6 are mounted in the form of (partially circular) round discs on the shaft holder 4. The at least three, preferably six webs 6 are arranged plane-parallel to one another in the direction of the axis of rotation on the shaft seat 4. The webs 6 extend around the shaft receiving 4 around. The webs 6 have at their backs radial recesses 20. The depressions 20 on the radial surface of the webs 6, ie the circumference / back of the webs 6, is designed as at least one knife holder block receptacle 20. The webs 6 have in the region of the chip space 10 at least one axial passage opening 22.

The knife holder 8 has, as mentioned above, a (middle) knife holder surface 24, which connects two cutter holder blocks / knife holder blocks or mounting portions 26 which are mounted in the recesses 20 with each other. In other words, the knife holder surface 24 is sandwiched between the knife holder blocks 26. Since the knife holder blocks 26 are fixed / fixable on the (fixing) webs 6, the webs 6 are also connected or clamped or bridged by the knife holder surface 24 and thus by the knife holder 8. The main function of the knife holder 8 is that it firstly the knife 28 receives / stores and second bridges the other, intermediate web 6 to form the chip space 10 with the desired geometry. This means that between the two webs 6, to which a respective knife holder 8 is fixed (fixing webs), a third web 6 is arranged, even if this is interrupted in the region of the chip space 10. The two outer webs 6 receive the knife holder 8 on the blocks 24 by means of the recess 20. At the point in the circumferential direction, is arranged at the two outer webs 6 of the knife holder 8, the knife holder 8, which is located between the two fixing webs 6, the chip space 10, as this is spanned by the knife holder 8 / bridged , The chip space 10 forms chip space bottom 42 in the form of a straight plane in the region of the intermediate web 6, so that the knife holder 8 extends between the two outer fixing webs 6 without touching the overstressed web 6 or the interposed web 6. At a higher number of webs 6 are all or all except for the two outermost webs 6 simultaneously spanning webs (fixing webs) 6 and spanned (intervening) webs. 6

In addition to the knife holder surface 24 and the two knife holder blocks 26, the knife holder 8 also has a recess / trough 30 on the (radially outer) side, which is radially remote from the axis of rotation. Furthermore, on this side of the knife holder surface 24 also holder protection plates are attached. The recess 30 is intended and adapted to receive the knife 28 and partially a knife cover 34. More specifically, the knife cover 34 rests on the knife 28, which in turn lies in the recess 30 on the knife holder surface 24 of the knife holder 8. The knife holder cover 34 has bores, preferably blind bores, in which fastening means, preferably screws, are received, which connect the knife holder cover 34 via through holes in the knife 28 with the knife holder 8. The recess 30 has a knife stop 36, which serves to transmit power from the chopping rotor 2 via the shaft holder 4 on at least one of the webs 6, on the knife holder 8 and thus on the knife 28 and on the blade cover 34. The knife 28 is the Component of the hacking rotor 2 made of the hardest material. The blade cover 34 and the holder protection plates are also made of a material that is harder in comparison to the shaft holder 4 or the body of the knife holder 8.

The chip space 10 is a recess or recess on the radially to the axis of rotation most remote surface of the respective web 6 and on its peripheral surface. The chip space 10 or the chip space bottom 42 runs straight, but along the circumference of the web 6. The chip space 10 is arranged so that it at least partially in front of the knife 28 (leading), which is held by two webs 6, starts / lies. A surface edge of preferably 90 degrees is formed between the radial surface of the web 6 and the side wall of the recess. The surface edge is arranged at least partially upstream of the blade 28 in the direction of rotation. The side wall is in the present embodiment, in gradation in the Spanraumgrund 42 over. The chip space bottom 42 is at the other end of the recess or the chip space 10 without corners / kinking transitions again in the surface of the respective web 6 on. In this case, a radial edge 40 is formed. The chip space 10 or the chip space bottom 42 thus forms a step in the rotor cross-section / edged transition from the leading edge in the direction of rotation or the beginning of the chip space 10 to the subsequent direction of rotation transition of the chip space 10 to the surface of the web. 6

The badges 12 are mounted on surfaces between the plane-parallel spaced webs 6, so the annular groove 14. These badges 12 are mounted in the form of elevations or small, short webs / strips at the bottom of the annular groove 14. On their turn, the sickles 16 are screwed about. They are attached to the knife in the direction of rotation in front. The badge 12 with or without a sickle have the task, the wood chips, which collects in the spaces between the webs 6, so the annular groove 14, to remove. The badge 12 and / or sickle 16 have axially aligned openings on their side walls in the form of through holes to form a fastener receptacle.

The bottom of the annular groove 14 forms the outer surface of the cylindrical shaft receptacle 4 and the side surfaces of the annular groove 14 are the lateral surfaces of the disc-shaped webs 6. The annular grooves 14 are as well as the webs 6 in the region of Spanraums 10 interrupted from Spanraumgrund 42.

The depressions 20 are introduced at the radial surface of the webs 6, ie to the radially most remote surface of the axis of rotation, and adapted and adapted to receive the respective, counterpart in the size counterpart / "block" 26 of the knife holder 8. The recesses 20 are preferably rectangular and rounded at their corners, which pass from the side wall of the recess in the bottom of the recess.

The axial through hole 22 and a plurality of axial through holes 22 is located in the webs 6. These openings 22 are through holes in the webs 6. They serve to reduce the weight of the webs 6 and the removal of wood chips in the annular grooves 14, by passing through them Rod for removal by an operator is feasible. These openings 22 are therefore arranged so that they are at adjacent, parallel webs 6 at the point at which the chip space 10 is located. This means that the openings 22 of the one web 6 and the chip space 10 of the adjacent web 6 are on an angular position or they are arranged parallel to each other on the webs 6.

FIG. 2 shows the chopping rotor 2 in a view in which the rotor 2 opposite to the representation FIG. 1 is rotated. In the FIG. 2 Accordingly, the elements shown are similar to those FIG. 1 and are presented here again in a different perspective for better spatial understanding of the invention. For example, it can be seen that the respectively bridged web has the shape of a disk fragment / a pitch circle. The disk fragment thus represents the part of the bridged by the blade holder 8 web 6, which is not interrupted by the chip space 10. In the circumferential direction of the chip space 10 preferably takes one Angular span of 60 ° to 120 °, preferably of about 90 °, wherein that angular range in the sense of flexible Spanraumausgestaltung in various embodiments can be varied.

FIG. 3 shows the hack rotor 2 in another view. Here, the compactness of the arrangement according to the invention is illustrated again. A first web 6a seen in the axial direction forms a first pair of fixing webs 6a, 6c with a third web 6c for the knife holder 8a. The web 6b formed between the webs 6a, 6c forms a first chip space 10a by means of the radial edge 40a. When viewed in the direction of rotation of the rotor 2, that is to say in the direction in which the blade / cutting edge 28a points, precisely that fixing web 6c of the first chip space 10a forms a bridged web for the second chip space 10b. The annular groove 14b, viewed in the circumferential direction, thus transitions from the second chip space 10b into the first chip space 10a. It follows that a fixation bridge is at the same time a bridged bridge and vice versa.

In FIG. 4 the knife holder 8 is shown enlarged. It is fixable by means of fixing elements 18 such that the knife holding block 26 in the recess 20 in addition to the form-fitting is still locked in a force-locking manner. The knife holding surface 24 also has the aforementioned recess 30 to receive the knife 28, which is protected except for its cutting edge by the knife cover 34.

FIG. 5 shows the rotor 2 in another view. A pair of screws 32 operable from outside pass through the knife cover 34 to define and stably secure the knife 28 in the knife support surface 24. The knife holding surface 24 has a knife stop 36 which provides a bearing surface for the knife 28 to further support the force received by the knife 28.

In FIG. 5 Moreover, the knife holding block 26 is not shown to illustrate the nature of the recess 20. In the present case, she has four Receiving holes 38, in each of which a screw which sets the knife holding block 26, can engage.

In addition, it should be mentioned that it is possible for the knife holder 8 or the knife holder surface 24 to be supported on the underlying web 6 or the chip surface 42 via a support web extending in the radial direction. The fact that the support web is kept small, there is still a relatively low risk that the chip space 10 clogged, with respect to the prior art. Also, it is possible by this design to apply a higher radial pressure to the axis of rotation, since the knife holder 8 can support itself and therefore can not be bent.

By means of the variable, so flexibly ausgestaltbaren, arrangement of the radial edge 40 in the circumferential direction and by means of the Messerhalteklotzes 26, the size of the chip space 10 via different characteristics adjust / flexibly enlarge what it enables the Hackrotor 2 according to the invention, the wood chip size to be achieved in the respective field of application adapt.

In order to further increase the chip space 10, a chip space bottom / chip space bottom 42 is removed radially inwards relative to the remaining radial outer area of the shaft receptacle 4. In other words, in the region of the chip space 10, a bulge / lifting of the chip space bottom 42 takes place, as a result of which the chip space volume is further increased. The chip space bottom 42 essentially represents a straight plane that has no curvature. The chip space bottom 42 is also arranged such that there exists a straight line which is orthogonal to the straight plane of the chip space bottom 42 and to the rotation axis of the chopping rotor 2.

On chip space 42 are also chip space card 44 mounted, which have the shape of a circular fragment and a transition between the Spanraumgrund 42 and the fixing webs 6 stepped designed, which serves as the leadership of wood chips in the chip space 10.

LIST OF REFERENCE NUMBERS

2

Hack rotor

4

shaft mount

6

web

8th

knife holder

10

chip space

12

Ausweiser

14

ring groove

16

sickle

18

fixing

20

Recess / knife holder block pick-up

22

opening

24

Knife holder surface

26

Knife holder Klotz

28

knife

30

deepening

32

screw

34

blade cover

36

knife attack

38

location hole

40

radial edge

42

Chip-space root

44

Chip space Ausweiser

Claims (10)

Hackrotor (2) for the production of wood chips with a shaft receiving (4) which has at least three, preferably six circumferential and axially spaced radial webs (6) on which knife holder (8) are mounted, wherein at least two fixing webs (6) a knife holder (8) is mounted such that it freely spans a third web (6) arranged between the two fixing webs (6), whereby underneath the knife holder (8) a chip space (10) of one axial length over three consecutive Webs (6) formed, characterized in that the web lying between the fixing webs (6) in the direction of rotation and the opposite direction is open and under the knife holder (8) forms an open chip space (10). Hacking rotor (2) according to claim 1, characterized in that the two fixing webs (6) at their radial outer sides each have at least one knife holder block (26) which are releasably attached to the fixing webs (6). 2. Hacking rotor (2) according to claim 2, characterized in that the webs (6) of the chopping rotor (2) each have depressions (20) for receiving the at least one knife holder block (26), wherein the depressions (20) are preferably configured rectangular. Hacking rotor (2) according to one of claims 2 or 3, characterized in that the knife holder blocks (26) are each releasably attached by screws to the webs (6). Hacking rotor (2) according to Claim 1, characterized in that the web (6) lying between the fixing webs, defined by a radial edge (40), constitutes a disk fragment in order to increase the volume of the chip space (10). Hacking rotor (2) according to one of claims 1 or 5, characterized in that the shaft receptacle (4) in the region of the chip space (10) is removed in such a way that it forms a chip space bottom (42) as a straight plane. Tread rotor (2) according to one of the preceding claims, characterized in that the webs (6) have axially aligned passage openings (22), which are preferably arranged at the point at which at an adjacent web (6) of the chip space (10) located. 2. Tread rotor (2) according to one of the preceding claims, characterized in that the knife holder (8) has a recess (30) for receiving the knife (28) and a knife cover (34) having a knife stop (36) at its end remote from the direction of rotation which supports both the knife (28) and the knife cover (34). A hacking rotor (2) according to any one of the preceding claims, characterized in that each web (6) receives at least one knife holder block (26), and preferably in each case two, which are diametrically opposed. A chopping rotor (2) according to any one of the preceding claims, characterized in that the knife holder (8) has holder protection plates made of a harder material than the body of the knife holder (8), wherein the holder protection plates are preferably soldered or welded.

Images