Dual-shaft grinder for grinding solid materials or solid materials in liquids, module system of a dual-shaft grinder, and method for disassembling and for assembling a dual-shaft grinder

Abstract

A dual-shaft grinder (1) for grinding solid materials (2), comprising: a grinder housing (10); an inlet opening (11); an outlet opening (12); a first and a second cutting disc unit (20, 30); a first and a second bearing device (41, 42), such that in an operating state a first cutting disc block (21) is mounted for rotation about a first axis of rotation (D1) with respect to the grinder housing; a third and a fourth bearing device (41, 43), such that in the operating state a second cutting disc block (31) is mounted for rotation about a second axis of rotation (D2) with respect to the grinder housing; wherein at least one of the four bearing devices is arranged so as to be movable relative to the grinder housing between an operating position and a maintenance position, which is different from the operating position; wherein in the operating position the at least one of the four bearing devices is mechanically coupled to the respective cutting disc unit for torque transmission, and in the maintenance position the at least one of the four bearing devices is mechanically decoupled from the respective cutting disc unit.

Description

[0001] Twin-shaft shredder for comminuting solids or solids in liquids, modular system of a twin-shaft shredder and method for disassembling and assembling a twin-shaft shredder

[0002] The invention relates to a twin-shaft shredder for comminuting solids or solids in liquids, comprising: a shredder housing defining an internal shredding chamber, an inlet opening in which

[0003] A crusher housing for supplying solids or solids in liquids into the crushing chamber, an outlet opening in the crusher housing for discharging crushed solids or crushed solids in liquids from the crushing chamber, wherein the outlet opening is preferably substantially opposite the inlet opening, a first cutter disc unit having a first cutter disc block with a plurality of first cutter discs arranged on a first hub body such that there is a gap between two adjacent first cutter discs, a second cutter disc unit having a second cutter disc block with a plurality of second cutter discs arranged on a second hub body such that there is a gap between two adjacent second cutter discs, wherein the first and second cutter disc units are axially offset from one another with their axes of rotation,so that at least one of the first knife discs engages in a space between two adjacent second knife discs and at least one of the second knife discs engages in a space between two adjacent first knife discs, a first bearing device is arranged on the first knife disc unit at a first axial end and a second bearing device is arranged on a second axial end, so that in an operating state the first knife disc block is rotatably mounted about a first axis of rotation relative to the shredder housing, a third bearing device is arranged on the second knife disc unit at a third axial end and a fourth bearing device is arranged on a fourth axial end, so that in the operating state the second knife disc block is rotatably mounted about a second axis of rotation relative to the shredder housing.

[0004] Furthermore, the invention relates to a modular system of a twin-shaft shredder.

[0005] Furthermore, the invention relates to both a method for disassembling and a method for assembling a twin-shaft shredder.

[0006] Twin-shaft shredders of this design are used to shred solids, such as organic matter such as animal carcasses, branches, twigs, plants, or other materials such as plastic waste. The solids to be shredded can be fed into the twin-shaft shredder through the inlet opening in dry form or in a liquid stream.

[0007] For effective shredding, twin-shaft shredders have two shafts, each of which is arranged with a plurality of cutting discs, referred to as cutting disc blocks. The cutting discs mesh with each other, which is achieved by maintaining an axial distance between two adjacent cutting discs in one cutting disc block that is greater than the thickness of a cutting disc in the other cutting disc block, and by maintaining a distance between the two cutting disc blocks that is smaller than the diameter of a cutting disc.

[0008] The two knife disc blocks of a twin-shaft shredder are typically driven in opposite directions and can be coupled together for this purpose, for example, via a suitable gearbox. Good shredding results are achieved particularly when the two knife disc blocks rotate at different speeds. This creates high shear and tear forces in the space between the two knife disc blocks due to the counter-rotating knife discs, resulting in effective shredding of the solids. Furthermore, different speeds ensure that different knife segments of adjacent knife discs engage with each other with each rotation, automatically cleaning the knife discs of any adhering material to be shredded.

[0009] A disadvantage of twin-shaft shredders of this type is that, due to the relative motion of the two shafts and the blade discs arranged on them, the blade discs can be damaged if a hard solid enters the shredding chamber and becomes trapped between two blade discs or between a blade disc and the opposite shaft. This can cause serious damage to the cutting edges of the blade discs, rendering further operation of the twin-shaft shredder impossible or resulting in reduced shredding efficiency. Depending on the type and quantity of materials to be shredded, wear on the blade discs can also occur.

[0010] For this reason, it is common practice to equip twin-shaft shredders with a quick-change system that allows the blades to be removed from the shafts to replace damaged blades. This allows the twin-shaft shredder to be restored to full functionality with minimal maintenance.

[0011] Another system, known from WO 2018 087 398, uses monolithic knife disc blocks, in which the individual knives are integrally connected to the shaft or hub. Shaft journals are then inserted at the axial ends to allow the entire knife disc block to be replaced easily and quickly.

[0012] Monolithic knife disc blocks are known from DE 20 2010 010 662 U1.

[0013] EP 3 248 687 discloses a twin-shaft shredder with a quick-change device. Here, the two blade shafts each have an axial recess on one side and a shaft journal on the other side, allowing removal through the inlet opening after loosening certain end-face parts. In particular, the entire motor block is removed from the end face. This represents a considerable effort, since an inlet funnel or the like must also be removed in order to replace the blade shafts.

[0014] DE 20 2012 007 418 U1 discloses a shredding device in which individual blades can be replaced through a side flap that can be opened like a door around a vertical axis. The blades are arranged on the shaft in such a way that they can be easily replaced. However, no rotating blades are provided. This concept cannot therefore be easily transferred to blade disc shafts or blade disc blocks as described above.

[0015] Another twin-shaft shredder is known from US 5,580,009 B1. The twin-shaft shredder disclosed therein is driven by a motor and a gearbox, so that the two blade shafts rotate in opposite directions at a fixed speed ratio. The shafts are connected to the respective bearing or drive units via shaft connectors, which can be separated. Wall elements on the sides of a shredder housing can be removed to allow the blade shafts to be replaced. A particular disadvantage here is the shaft connection, which entails certain strength disadvantages.

[0016] Furthermore, EP 2 846 918 B1 discloses a maintenance-friendly twin-shaft shredder in which the hopper, including part of the knife shaft bearing, can be folded open so that the knife shafts are accessible from above. The knife shafts can then be released by removing special bearing plates from the housing. The knife shafts can then be removed upwards and replaced with new or different knife shafts. The hopper, including the bearing shells, is then folded back into place. The disadvantage of this is that the hopper has to be folded away. For this reason, the twin-shaft shredder disclosed here is not suitable for installation variants in which, for example, a pipeline is provided instead of a hopper, or for twin-shaft shredders in which the hopper is fixed in some other way and cannot be easily removed.

[0017] Other twin-shaft shredders are known, for example, from EP 3 566 777 A1, DE 10 2007 049 028 A1, US 2014 0103152 A1, EP 2 662 143 A2, DE 4 315 671 A1, EP 3 453 460 A1 and EP 2 736 645 A1.

[0018] The object of the present invention is to provide a twin-shaft shredder of the type mentioned above, which is designed to be improved with regard to maintenance and / or wear and tear or service life. In particular, it should be user-friendly, save time in maintenance, and preferably prevent errors. This object is achieved in a first aspect by a twin-shaft shredder having the features of claim 1.Accordingly, the twin-shaft shredder is characterized in that at least one of the four bearing devices is arranged so as to be relatively movable relative to the shredding housing between an operating position in the operating state and a maintenance position different from the operating position in the maintenance state, wherein in the operating position the at least one of the four bearing devices is mechanically coupled to the respective knife disk unit for transmitting a torque and in the maintenance position the at least one of the four bearing devices is mechanically decoupled from the respective knife disk unit.

[0019] The invention is based on the inventors' finding that it is advantageous if at least one of the four bearing devices, preferably at least one bearing device for each cutter disc unit, in particular all bearing devices, are arranged on the shredder housing in such a way that the respective cutter disc unit is released by a relative movement of the corresponding bearing device for the removal of the respective cutter disc unit from the shredder housing by mechanically decoupling the respective cutter disc unit from the respective bearing device. In this way, the cutter disc unit can be easily removed for maintenance work without the need for complex disassembly work within the shredder housing.Preferably, the respective bearing device is simply removed from the corresponding cutter disc unit, allowing the cutter disc unit to be removed from the shredder housing, for example, from the side, upwards, or downwards. In particular, this eliminates the need for laborious cleaning of fasteners within the shredder housing, which inevitably become dirty during operation. Furthermore, the problem of fasteners for securing the bearing device being located within the shredder housing, which are difficult to remove due to wear and tear, and which require relatively frequent replacement with new fasteners, is eliminated.

[0020] Therefore, with the solution according to the invention, it is not necessary to dismantle the bearing device of the knife disk units when exchanging or replacing the knife disk units. Rather, the at least one bearing device is located directly outside the shredder housing and is simply moved from the operating position to the maintenance position relative to the shredder housing in order to release the respective knife disk unit for removal or to enable insertion into the shredder housing. This also enables easier maintenance of the bearing devices themselves. In prior art solutions that propose, for example, the separable shafts and the like described above, the bearings remain in the shredder housing, and only the shafts and knives are replaced.This subsequently complicates maintenance of the bearings, which requires almost complete disassembly of the entire twin-shaft shredder, which subsequently complicates maintenance of the bearings considerably. To avoid this, the invention proposes that at least one of the bearing devices be relatively displaceable outside the bearing device between the operating position and the maintenance position. This also has the particular advantage that, during maintenance work that is only required on the cutting disc unit, the bearing devices do not have to be removed from the shredder housing together with the cutting disc unit.

[0021] For this purpose, at least one of the four bearing devices is or can be releasably fastened to the comminution housing in the operating position. In particular, it is preferred that at least one of the four bearing devices is or can be releasably fastened to the comminution housing in a form-fitting and / or force-fitting manner in the operating position. In particular, it is preferred that at least one of the four bearing devices is or can be releasably fastened to an outer side of the comminution housing in the operating position. The outer side of the comminution housing is preferably a side facing away from the internal comminution chamber. The releasable connection for releasably fastening at least one of the four bearing devices in the operating position to the comminution housing can in particular comprise a screw connection and / or a hook connection and / or a clamp connection.Additionally or alternatively, the detachable connection can have a clamping hook connection.

[0022] Preferably, at least one of the four bearing devices is arranged adjacent to the shredder housing in the operating position and arranged at a distance from the shredder housing in the maintenance position. In particular, at least one of the four bearing devices is arranged externally or substantially externally on the shredder housing. It may be preferred for at least one of the four bearing devices to extend partially within the shredder housing. Preferably, at least one of the two bearing devices of the respective knife disk unit is arranged externally on the shredder housing between the operating position and the maintenance position, movable relative to the shredder housing.In particular, it is preferred that for each knife disc unit both bearing devices of the respective knife disc unit are arranged externally on the shredder housing so as to be relatively movable relative to the shredder housing between the operating position and the maintenance position.

[0023] It is preferred that at least one of the four bearing devices can be moved between the operating position and the maintenance position relative to the rotational axes of the blade disk units in the axial direction and / or in the radial direction and / or in the circumferential direction. In particular, the twin-shaft shredder can have a guide device for this purpose, which guides a movement of at least one of the four bearing devices between the operating position and the maintenance position in the axial direction and / or in the radial direction and / or in the circumferential direction.

[0024] The shredder housing has an inlet wall or inlet side having the inlet opening, an outlet wall or outlet side having the outlet opening and first and second end walls, preferably extending transversely to the first and second axes of rotation, as well as first and second transverse walls, preferably extending parallel to the first and second axes of rotation. Preferably, the inlet wall or the inlet side is arranged above the first and second cutting disk unit in the operating state of the twin-shaft shredder and / or the outlet wall or the outlet side is arranged below the first and second cutting disk unit in the operating state. Preferably, a maintenance flap is provided on the first and / or second transverse wall. The inlet wall and the outlet wall, the inlet side and the outlet side, as well as the end walls and transverse walls thus preferably delimit the internal shredding chamber.

[0025] The comminution housing is particularly designed such that it encloses the first and second cutting disk units. The first and second cutting disk units thus preferably extend within the internal comminution chamber. Thus, the comminution of solids or of solids in liquids takes place within the comminution housing in the internal comminution chamber. In the operating position, at least one of the four bearing devices is mechanically connected to a cutting disk unit. Preferably, the mechanical connection between the at least one bearing device and the respective cutting disk unit is a force-fitting and / or form-fitting connection. In particular, the mechanical connection between the at least one bearing device and the respective cutting disk unit in the operating position is a detachable connection.

[0026] The arrangement of the bearing devices for supporting the respective cutter disc unit in the operating position is preferably provided by a fixed-loose bearing arrangement. It may be preferred that the arrangement of the bearing devices of the respective cutter disc unit in the operating position be provided as an adjusted bearing arrangement, wherein, in particular, an O-arrangement, an X-arrangement, or a tandem arrangement of the bearing devices of the respective cutter disc unit can be provided. Furthermore, a floating bearing arrangement of the two cutter disc units with the respective bearing devices may also be preferred.

[0027] In the maintenance position, in which the at least one bearing device is mechanically decoupled from the respective cutting disk unit, in particular no transmission of torque can take place. In particular, in the maintenance position, the at least one bearing device is mechanically decoupled from the respective cutting disk unit in such a way that the respective cutting disk unit can be removed for maintenance purposes or can be reinserted after maintenance has been carried out. In the maintenance position, it is therefore possible, in particular, to remove the respective cutting disk unit from the internal comminution space of the shredder housing and to insert the respective cutting disk unit into the internal comminution space of the shredder housing. In particular, it is preferred that in the maintenance position, the removal and / or insertion of the respective cutting disk unit is possible substantially orthogonal to the respective axes of rotation.It is to be understood that the at least one bearing device in the maintenance position is preferably connected to the shredder housing, in particular to the outside of the shredder housing.

[0028] It is preferably provided that the first knife disk unit is of monolithic design. In particular, it is preferred that the first knife disk block with the plurality of first knife disks is of monolithic design. Preferably, the first knife disk block and the first hub body are of monolithic design. In particular, this means that the first knife disk block and the first hub body are of one-piece design. It is preferably provided that the second knife disk unit is of monolithic design. In particular, it is preferred that the second knife disk block with the plurality of second knife disks is of monolithic design. Preferably, the second knife disk block and the second hub body are of monolithic design. In particular, this means that the second knife disk block and the second hub body are of one-piece design.

[0029] According to a preferred development of the twin-shaft shredder, it is provided that the first bearing device comprises a first bearing unit and a first bearing housing, wherein the first bearing unit is preferably arranged within the first bearing housing. Additionally or alternatively, this preferred development provides that the second bearing device comprises a second bearing unit and a second bearing housing, wherein the second bearing unit is preferably arranged within the second bearing housing. Furthermore, it can be provided additionally or alternatively that the third bearing device comprises a third bearing unit and a third bearing housing, wherein the third bearing unit is preferably arranged within the third bearing housing.Furthermore, according to this preferred development, it can be provided additionally or alternatively that the fourth bearing device comprises a fourth bearing unit and a fourth bearing housing, wherein the fourth bearing unit is preferably arranged within the fourth bearing housing.

[0030] The respective bearing unit can comprise one or more bearings. Various mechanical bearings can be considered for the respective bearing unit. For example, the bearings can be deep groove ball bearings, tapered roller bearings, self-aligning ball bearings, cylindrical roller bearings, needle bearings, angular contact ball bearings, or even plain bearings. In principle, any bearing suitable for supporting the respective cutting disc unit in rotation relative to the shredder housing during operation can be considered.

[0031] As a bearing concept, a fixed-loose bearing can be provided for the rotatable mounting of the respective cutting disk unit relative to the shredder housing during operation. Accordingly, for the rotatable mounting of the first cutting disk unit, the first bearing unit could be designed as a fixed bearing and the second bearing unit as a loose bearing, or vice versa. For the rotatable mounting of the second cutting disk unit, it could be provided that the third bearing unit is designed as a fixed bearing and the fourth bearing unit as a loose bearing, or vice versa. Alternatively, a support bearing can also be preferred as a bearing concept during operation. This can be designed as a floating or adjusted bearing.With the floating support bearing, each cutter disc unit would have some play in the axial direction, so that, depending on the load direction, one of the two bearing units of the respective cutter disc unit assumes the function of the fixed bearing and the other bearing unit assumes the function of the floating bearing. With the proposed bearing concept, each cutter disc unit would be mounted so that it can rotate in the axial direction with a defined preload. The bearing units can be designed to form an O-arrangement or an X-arrangement.

[0032] It should be understood that the same bearing concept can be provided for the first and second cutter disc units. However, it may also be preferable to provide different bearing concepts for the first and second cutter disc units.

[0033] Preferably, the respective bearing unit forms a so-called flange bearing with the associated bearing housing. In this preferred embodiment, the respective bearing housing is designed as a flange. In particular, the respective bearing housing is designed to arrange the bearing device so that it can be displaced relative to the shredder housing between the operating position and the maintenance position.

[0034] For this purpose, the bearing housing preferably has guide surfaces which, in conjunction with a guide device, enable the relative movement of the respective bearing device relative to the shredder housing between the operating position and the maintenance position along a defined guide path. The guide surfaces are preferably formed by bore walls, in particular by walls of through-bores, and / or grooves on the respective bearing housing. These guide surfaces preferably interact with guide surfaces formed by or on the shredder housing, in particular on the outside.

[0035] Additionally or alternatively, it may be preferred that the guide surfaces are formed by projections, for example pins or bolts.

[0036] Furthermore, it is preferably provided that the respective bearing housing has a fastening device for attachment to the shredder housing. In particular, the fastening device is designed such that it enables attachment of the respective bearing housing to the shredder housing in the operating position. In addition, the fastening device is preferably designed such that it enables detachment of the bearing housing from the shredder housing in the operating position, so that the respective bearing device can be moved from the operating position to the maintenance position.

[0037] Furthermore, according to a preferred embodiment of the twin-shaft shredder, the first bearing device has a first shaft stub which, in the operating position, is mechanically coupled to the first cutter disc unit for transmitting a torque in the region of the first axial end, and, in the maintenance position, is mechanically decoupled from the first cutter disc unit and / or is arranged at a distance from the first axial end; and / or the second bearing device has a second shaft stub which, in the operating position, is mechanically coupled to the first cutter disc unit for transmitting a torque in the region of the second axial end, and, in the maintenance position, is mechanically decoupled from the first cutter disc unit and / or is arranged at a distance from the second axial end;and / or the third bearing device has a third shaft stub, which in the operating position is mechanically coupled to the second cutter disc unit in the region of the third end for transmitting a torque, and in the maintenance position is mechanically decoupled from the second cutter disc unit and / or is arranged at a distance from the third end; and / or the fourth bearing device has a fourth shaft stub, which in the operating position is mechanically coupled to the second cutter disc unit in the region of the fourth end for transmitting a torque, and in the maintenance position is mechanically decoupled from the second cutter disc unit and / or is arranged at a distance from the fourth end.;

[0038] The respective shaft stub can be detachably coupled to the respective axial end of the corresponding cutting disk unit. In particular, it is provided that the respective shaft stub is coupled to the respective axial end in the operating position for transmitting a torque. Preferably, the respective shaft stub is non-positively and / or positively connected to the respective axial end in the operating position. In particular, it can be provided that the respective shaft stub is connected to the respective axial end in the operating position by means of a screw connection. Preferably, the respective shaft stub is positively coupled to the respective axial end in the operating position in the circumferential direction. In particular, it can be preferred that the respective shaft stub is arranged so as to be displaceable, in particular axially displaceable, relative to the respective axial end.

[0039] The cutting disc units can be mounted rotatably relative to the shredder housing via the respective shaft stubs and the respective bearing units.

[0040] In the operating position, the shaft stubs preferably extend from the outside through the shredder housing into the shredding chamber. This allows the cutting disc units to be or have been mechanically coupled to the respective shaft stubs within the shredder housing in the operating position.

[0041] Furthermore, in a preferred embodiment of the twin-shaft shredder, it is provided that the first shaft stub extends in the axial direction between a first stub end section and a second stub end section, wherein the first stub end section has a conically shaped shaft section, which is preferably not self-locking, and / or has a shaft section with a polygonal cross-section, which is designed to transmit a torque between the first shaft stub and the first knife disk unit in the operating position;and / or the second stub shaft extends in the axial direction between a first stub end portion and a second stub end portion, wherein the first stub end portion has a conically shaped shaft portion, which is preferably not self-locking, and / or has a shaft portion which is polygonal in cross-section and is designed to transmit a torque between the second stub shaft and the first cutter disc unit in the operating position;and / or the third stub shaft extends in the axial direction between a first stub end section and a second stub end section, wherein the first stub end section has a conically shaped shaft section, which is preferably not self-locking, and / or has a shaft section with a polygonal cross-section, which is designed to transmit a torque between the third stub shaft and the second cutter disc unit in the operating position;and / or the fourth shaft stub extends in the axial direction between a first stub end section and a second stub end section, wherein the first stub end section has a conically shaped shaft section, which is preferably not self-locking, and / or has a shaft section with a polygonal cross-section, which is designed to transmit a torque between the fourth shaft stub and the second knife disk unit in the operating position.;

[0042] Furthermore, in a preferred embodiment of the twin-shaft shredder, it is provided that the first knife disk unit has a first axial recess at the first axial end, into which the first shaft stub extends in the operating position, and / or has a second axial recess at the second end, into which the second shaft stub extends in the operating position. Additionally or alternatively, it is provided in this preferred embodiment that the second knife disk unit has a third axial recess at the third end, into which the third shaft stub extends in the operating position, and / or has a fourth axial recess at the fourth end, into which the fourth shaft stub extends in the operating position.

[0043] Furthermore, in a preferred embodiment of the twin-shaft shredder, it is provided that the first axial recess has a conically shaped recess section, which is preferably not self-locking, and is designed to receive the conically shaped shaft section of the first shaft stub, and / or a section with a polygonal inner circumferential surface, which is designed to receive the shaft section of the first shaft stub, which has a polygonal cross-section; and / or the second axial recess has a conically shaped recess section, which is preferably not self-locking, and is designed to receive the conically shaped shaft section of the second shaft stub, and / or a section with a polygonal inner circumferential surface, which is designed to receive the shaft section of the second shaft stub, which has a polygonal cross-section;and / or the third axial recess has a conically shaped recess section, which is preferably not self-locking, and is designed to receive the conically shaped shaft section of the third shaft stub, and / or a section with a polygonal inner circumferential surface, which is designed to receive the shaft section of the third shaft stub, which has a polygonal cross-section; and / or the fourth axial recess has a conically shaped recess section, which is preferably not self-locking, and is designed to receive the conically shaped shaft section of the fourth shaft stub, and / or a section with a polygonal inner circumferential surface, which is designed to receive the shaft section of the fourth shaft stub, which has a polygonal cross-section.

[0044] In a further preferred embodiment, the twin-shaft shredder has a guide device for guiding the movement of the at least one bearing device, in particular the bearing housing and / or the bearing unit and / or the shaft stub of the at least one bearing device, between the operating position and the maintenance position.

[0045] The guide device is particularly designed to move the at least one bearing device along a defined guide path between the operating position and the maintenance position. Preferably, the guide device defines an axial movement path. In this preferred development, the guide device enables axial displacement of the bearing device between the operating position and the maintenance position.

[0046] In particular, it should be understood that one guide device can be provided for each bearing device. Preferably, one guide device is provided for each bearing device that is movable between the operating position and the maintenance position. In particular, the respective guide device is designed as described above and / or below.

[0047] Furthermore, in a preferred development of the twin-shaft shredder, it is provided that the guide device is a linear guide or comprises this, wherein the linear guide is formed in particular by at least one guide pin which preferably extends from the shredder housing.

[0048] The linear guide preferably extends in such a way that it enables a linear displacement of the at least one bearing device between the operating position and the maintenance position parallel to the first and / or second axis of rotation. In particular, the linear guide is or comprises a guide opening, preferably a through-opening and / or a groove. The guide opening is preferably aligned in such a way that it enables a linear displacement of the at least one bearing device between the operating position and the maintenance position parallel to the first and / or second axis of rotation. Furthermore, in a preferred development of the twin-shaft shredder, it is provided that the guide device is arranged relative to the shredder housing in such a way that it enables a guidance of the at least one bearing device parallel to the first and / or second axis of rotation between the operating position and the maintenance position.

[0049] In particular, according to a preferred embodiment, the twin-shaft shredder is designed such that the guide device is designed to move the at least one bearing device between the operating position and the maintenance position parallel to the first and / or second axis of rotation.

[0050] Furthermore, according to a preferred development, the twin-shaft shredder comprises a fastening device for fastening, preferably for axial fastening, the at least one bearing device, in particular the bearing housing or the shaft stub of the at least one bearing device, to the shredder housing in the operating position. Alternatively, the twin-shaft shredder according to this preferred development comprises a fastening device for axially fastening the shaft stub to the bearing housing of the at least one bearing device.

[0051] In particular, it should be understood that one fastening device can be provided for each bearing device. Preferably, one fastening device is provided for each bearing device that is movable between the operating position and the maintenance position. In particular, the respective fastening device is designed as described above and / or below.

[0052] According to a further preferred development of the twin-shaft shredder, the fastening device is designed for force-locking and / or form-locking fastening.

[0053] Furthermore, according to a preferred embodiment of the twin-shaft shredder, it is provided that the fastening device is or comprises a screw connection and / or a clamp connection.

[0054] Preferably, in a preferred embodiment of the twin-shaft shredder, the shredder housing has at least one maintenance flap for opening or closing the internal shredding chamber and for removing or inserting the first knife disk unit and / or the second knife disk unit from or into the internal shredding chamber in the maintenance state. This maintenance flap at least partially exposes the internal shredding chamber in a removal position and closes the internal shredding chamber from the surroundings of the shredder housing in a closing position different from the removal position. The removal flap is preferably formed on a side wall of the shredder housing, which extends parallel or longitudinally to the first and / or second axis of rotation.

[0055] This design has the advantage that the maintenance flap allows a cutting disc unit to be removed from the shredder housing or inserted into the shredder housing with minimal effort. Thus, for example, it is not necessary to remove a hopper or the like or to remove a pipe at the outlet opening in order to remove or insert the cutting disc unit. Rather, the maintenance flap provides access to the shredder housing such that the respective cutting disc unit can be removed without the need for laborious disassembly of additional elements on the shredder housing.

[0056] It may be preferred for the shredder housing to have two maintenance flaps, with the two maintenance flaps being provided in particular opposite one another. The second maintenance flap is preferably designed analogously to the first maintenance flap. The provision of an additional maintenance flap has the particular advantage of further facilitating access to the shredding chamber and facilitating the removal and insertion of the respective cutting disc units.

[0057] In a further preferred embodiment of the twin-shaft shredder, it is provided that the at least one maintenance flap has a scraper with scraper elements which, in the closed position of the maintenance flap, engage in the space between two adjacent knife disks of one of the two knife disk units.

[0058] Furthermore, according to a preferred development of the twin-shaft shredder, it is provided that the hub body of at least one of the two knife disk units has at least one handling groove for handling the at least one knife disk unit with a handling device during removal from or insertion into the internal shredding chamber in the maintenance state, wherein the at least one handling groove extends with a main direction of extension orthogonal to the axis of rotation of the at least one knife disk unit.

[0059] The handling groove is preferably an at least partially, preferably completely, circumferential groove. In particular, it is provided that the handling groove has a main extension direction in the circumferential direction. The main extension direction of the handling groove is thus orthogonal to the first and / or second axis of rotation. The handling groove has a depth and / or a width such that the handling device can grip into the handling groove for removal or insertion. The width of the handling groove preferably extends in the axial direction of the respective knife disk units, ie longitudinally to the first and / or second axis of rotation. Furthermore, it is preferred that the handling groove extends in the radial direction with a depth.

[0060] Preferably, the first and / or second cutter disc unit has two, three, or more handling grooves. In particular, it is preferred that a handling groove is provided in an outer third of the respective cutter disc unit, starting from the respective axial end. This enables easy and well-controlled handling of the cutter disc units to be removed and / or inserted with the respective handling device.

[0061] Furthermore, according to a preferred development of the twin-shaft shredder, the at least one handling groove is formed between two adjacent knife disks of the at least one knife disk unit on the hub body of the at least one knife disk unit, wherein the handling groove preferably has a main extension direction in the circumferential direction of the hub body. The handling groove preferably has a width that is less than the distance between the two adjacent knife disks of the at least one knife disk unit. However, it may also be preferred for the width of the handling groove to correspond to the distance between the two adjacent knife disks of the at least one knife disk unit.

[0062] According to a further preferred embodiment, the twin-shaft shredder comprises the handling device. The handling device is provided for removing at least one of the two cutter disc units from or inserting it into the internal shredding chamber during the maintenance state, orthogonal to the rotational axis of the respective cutter disc unit. In a preferred development of the twin-shaft shredder, the handling device comprises at least one gripper, which at least partially encompasses the hub body of the corresponding cutter disc unit between two adjacent cutter discs for removing or inserting at least one of the two cutter disc units.

[0063] In particular, the handling device can be designed as a type of gripping tongs. It can also be preferred that the handling device is designed essentially for lifting and lowering as well as pushing and pulling the respective knife disk unit. In particular, the handling device for handling the knife disk unit can enclose it in the circumferential direction at least in sections, for example over 45°, 90°, 120° or 180°. Preferably, the handling device, in particular the gripper, has a width which corresponds to the width of the handling groove or which is smaller than the width of the handling groove. Preferably, it is provided that the handling device and the handling groove are coordinated with one another in such a way that they form a clearance fit when the handling device is inserted into the handling groove for removing and / or inserting the respective knife disk unit.

[0064] Furthermore, according to a preferred embodiment of the twin-shaft shredder, the at least one gripper engages in one of the at least one handling grooves for removing or inserting at least one of the two blade disc units. This enables, in particular, simple and reliable handling of the blade disc units to be handled.

[0065] According to a further preferred development, the twin-shaft shredder has, as a first torque transmission device, a motor of a first type, which is mechanically coupled to the first cutting disc unit via a first torque transmission interface. Additionally or alternatively, according to this preferred development, the twin-shaft shredder has, as a second torque transmission device, a motor of a second type or a transmission, which is mechanically coupled to the first cutting disc unit via a second torque transmission interface.

[0066] Furthermore, according to a preferred embodiment of the twin-shaft shredder, it is provided that the gear mechanism mechanically couples the second knife disc unit to the first knife disc unit for transmitting a torque from the first knife disc unit to the second knife disc unit, or the gear mechanism can be mechanically coupled to the first knife disc unit and the second knife disc unit for transmitting a torque from the first knife disc unit to the second knife disc unit.

[0067] According to a further preferred development of the twin-shaft shredder, it is provided that the motor of the first type is different from the motor of the second type or the motor of the first type corresponds to the motor of the second type.

[0068] According to a further aspect of the invention, the object mentioned above is achieved by a method for disassembling a twin-shaft shredder, in particular a twin-shaft shredder according to one of the above-described preferred embodiments of a twin-shaft shredder according to the first aspect. The method comprises the steps of: providing a shredder housing with a maintenance flap for opening or closing a shredding chamber located inside the shredder housing and for removing or inserting a first cutter disc unit and / or a second cutter disc unit in a maintenance state, wherein, in an operating state, the first and second cutter disc units are arranged within the shredding chamber and are each rotatably mounted relative to the shredder housing via two bearing devices,wherein at least one of the bearing devices is arranged to be movable between an operating position in the operating state and a maintenance position in the maintenance state, wherein in the operating position, the at least one of the four bearing devices is mechanically coupled to the respective cutter disc unit for transmitting a torque and in the maintenance position, the at least one of the four bearing devices is mechanically decoupled from the respective cutter disc unit, opening the maintenance flap so that the maintenance flap is moved from a closed position to a removal position and the shredding chamber is released to the surroundings of the shredder housing for removal of the at least one cutter disc unit, moving at least one of the bearing devices from the operating position to the maintenance position so that the moved bearing device is mechanically decoupled from the corresponding cutter disc unit,Removing the knife disc unit mechanically decoupled from the at least one storage device, preferably with a handling device.

[0069] The twin-shaft shredder according to the first aspect of the invention and the method for disassembling a twin-shaft shredder according to the further aspect of the invention have similar and identical sub-aspects, as set forth in particular in the dependent claims. In this respect, reference is made in full to the above description of the first aspect of the invention. The method for disassembling a twin-shaft shredder manifests similar or identical advantages as described with reference to the twin-shaft shredder according to the first aspect of the invention.

[0070] According to a preferred development, the method comprises the step of: releasing a fastening device of the at least one bearing device to be moved.

[0071] According to a further aspect of the invention, the object mentioned above is achieved by a method for assembling a twin-shaft shredder, in particular a twin-shaft shredder according to one of the above-described preferred embodiments of a twin-shaft shredder according to the first aspect. The method comprises the steps of: providing a shredder housing with a maintenance flap for opening or closing a shredding chamber located inside the shredder housing and for removing or inserting a first cutter disc unit and / or a second cutter disc unit in a maintenance state, wherein in an operating state, the first and second cutter disc units are arranged within the shredding chamber, each of which is rotatably mounted relative to the shredder housing via two bearing devices,wherein at least one of the bearing devices is arranged to be movable between an operating position in the operating state and a maintenance position in the maintenance state, wherein in the operating position, the at least one of the four bearing devices is mechanically coupled to the respective cutter disc unit for transmitting a torque, and in the maintenance position, the at least one of the four bearing devices is mechanically decoupled from the respective cutter disc unit, providing the first and / or second cutter disc unit to be inserted; inserting the first and / or second cutter disc unit into the internal comminution chamber, preferably with a handling device; moving the at least one bearing device from the maintenance position into the operating position, so that the at least one bearing device is mechanically coupled to the respective cutter disc unit for transmitting a torque; and closing the maintenance flap,so that the maintenance flap is moved from a removal position to a closed position and the shredding chamber is closed off from the environment during operation.

[0072] The twin-shaft shredder according to the first aspect of the invention and the method for assembling a twin-shaft shredder according to the further aspect of the invention have similar and identical sub-aspects, as set out in particular in the dependent claims. In this respect, reference is made in full to the above description of the first aspect of the invention. The method for assembling a twin-shaft shredder manifests similar or identical advantages as described with reference to the twin-shaft shredder according to the first aspect of the invention.

[0073] According to a preferred embodiment, the method comprises the step of: fastening a fastening device of the at least one bearing device to the shredder housing.

[0074] According to a further aspect of the invention, the object mentioned at the outset is achieved by a modular system of a twin-shaft shredder, in particular of twin-shaft shredders according to one of the above-described preferred embodiments of a twin-shaft shredder according to the first aspect, comprising: a shredder housing defining an internal shredding chamber, an inlet opening in the shredder housing for supplying solids to be shredded into the shredding chamber, an outlet opening in the shredder housing for removing shredded solids from the shredding chamber, wherein the outlet opening is preferably substantially opposite the inlet opening, a first cutter disc unit having a first cutter disc block with a plurality of first cutter discs arranged on a first hub body such that there is a gap between each two adjacent first cutter discs,a second cutter disc unit with a second cutter disc block with a plurality of second cutter discs, which are arranged on a second hub body such that there is a gap between two adjacent second cutter discs, wherein the first and second cutter disc units are axially offset from one another with their axes of rotation such that at least one of the first cutter discs engages in a gap between two adjacent second cutter discs and at least one of the second cutter discs engages in a gap between two adjacent first cutter discs, a first bearing device is arranged on the first cutter disc unit at a first axial end and a second bearing device is arranged on a second axial end, such that in an operating state the first cutter disc block is mounted so as to be rotatable about a first axis of rotation relative to the shredder housing,a third bearing device is arranged on the second cutter disc unit at a third axial end and a fourth bearing device is arranged on a fourth axial end, so that in the operating state the second cutter disc block is mounted rotatably about a second axis of rotation relative to the shredder housing, a first torque transmission device arranged on the first cutter disc unit, which is or can be mechanically coupled to the first cutter disc unit, and a second torque transmission device arranged on the second cutter disc unit, which is or can be mechanically coupled to the second cutter disc unit, characterized in that the modular system has, as the first torque transmission device, a motor of the first type, which is or can be mechanically coupled to the first cutter disc unit via a first torque transmission interface,and the modular system comprises, as a second torque transmission device, a motor of a second type which is mechanically coupled or is mechanically coupled to the second cutter disc unit via a second torque transmission interface, and a transmission which is mechanically coupled or is mechanically coupled to the second cutter disc unit via the second torque transmission interface.

[0075] The twin-shaft shredder according to the first aspect of the invention and the modular system of a twin-shaft shredder according to the further aspect of the invention have similar and identical sub-aspects, as set forth in particular in the dependent claims. In this respect, reference is made in full to the above description of the first aspect of the invention. The modular system of a twin-shaft shredder manifests similar or identical advantages as described with reference to the twin-shaft shredder according to the first aspect of the invention.

[0076] In a preferred development of the modular system, it is provided that the gear mechanism mechanically couples the second cutter disc unit to the first cutter disc unit for transmitting a torque from the first cutter disc unit to the second cutter disc unit, or the gear mechanism can be mechanically coupled to the first cutter disc unit and the second cutter disc unit for transmitting a torque from the first cutter disc unit to the second cutter disc unit.

[0077] According to a further preferred embodiment of the modular system, it is provided that the motor of the first type is different from the motor of the second type or the motor of the first type corresponds to the motor of the second type.

[0078] For the advantages, embodiment variants and embodiment details of these further aspects of the invention and its developments, reference is also made to the preceding description of the corresponding features of the twin-shaft shredder for shredding solids or solids in liquids according to the first aspect or the respective other aspects and their developments.

[0079] Embodiments of the invention will now be described below with reference to the drawings. These are not necessarily intended to represent the embodiments to scale; rather, the drawings are schematic and / or slightly distorted where this is useful for explanation. With regard to additions to the teachings immediately apparent from the drawings, reference is made to the relevant prior art. It should be noted that numerous modifications and changes to the form and detail of an embodiment can be made without deviating from the general idea of ​​the invention. The features of the invention disclosed in the description, in the drawings and in the claims can be essential for the further development of the invention, both individually and in any combination.Furthermore, all combinations of at least two of the features disclosed in the description, the drawings and / or the claims fall within the scope of the invention. The general idea of ​​the invention is not limited to the exact form or detail of the preferred embodiments shown and described below, or limited to an object that would be more limited than the object claimed in the claims. For specified dimensioning ranges, values ​​within the stated limits are also intended to be disclosed as limit values ​​and to be used and claimed as desired. For the sake of simplicity, the same reference numerals are used below for identical or similar parts or parts with identical or similar functions.

[0080] Further advantages, features and details of the invention will become apparent from the following description of the preferred embodiments and from the drawings, which show:

[0081] Figure 1 a is a schematic three-dimensional view of a twin-shaft shredder for shredding solids or solids in liquids in a first preferred embodiment;

[0082] Figure 1b is a schematic three-dimensional view of a twin-shaft shredder for shredding solids or solids in liquids in a second preferred embodiment; Figure 2 is a schematic three-dimensional sectional view of the first preferred embodiment of the twin-shaft shredder shown in Figure 1a;

[0083] Figure 3 shows the embodiment of the twin-shaft shredder shown in Figure 1 a with a maintenance flap in a removal position;

[0084] Figure 4 shows the embodiment of the twin-shaft shredder shown in Figure 1 a with a handling device in the removal position;

[0085] Figure 5 is a plan view of the embodiment of the twin-shaft shredder shown in Figure 1a with the handling device in the removal position;

[0086] Figure 6 is a detailed view of the lateral three-dimensional view shown in Figure 5;

[0087] Figure 7 shows the embodiment of the twin-shaft shredder shown in Figure 1 a with a knife disc unit removed from the shredding chamber;

[0088] Figure 8a is a schematic two-dimensional side view of a module system of a twin-shaft shredder in a first preferred embodiment;

[0089] Figure 8b is a schematic two-dimensional side view of a module system of a twin-shaft shredder in a second preferred embodiment;

[0090] Figure 9 is a schematic block diagram of a method for disassembling a twin-shaft shredder in a preferred embodiment; and

[0091] Figure 10 is a schematic block diagram of a method for assembling a twin-shaft shredder in a preferred embodiment.

[0092] Figures 1 a and 1 b each show a schematic three-dimensional view of a twin-shaft shredder 1 for shredding solids 2 or solids in

[0093] Liquids in a first and second preferred embodiment. These twin-shaft shredders 1 have a shredder housing 10 which defines an internal shredding chamber 13. The shredder housing 10 comprises an inlet opening 11 through which solids 2 or solids in liquids to be shredded can be fed to the shredding chamber 13. Furthermore, the shredder housing 10 comprises an outlet opening 12 through which shredded solids 3 or shredded solids in liquids are discharged from the shredding chamber 13. In this preferred embodiment, it is provided that the outlet opening 12 is formed opposite the inlet opening 11, wherein the inlet opening is arranged above the outlet opening 12 in the flow direction in the operating state of the twin-shaft shredder, so that the shredding and conveying of the solids orthe solids in liquids through the comminution chamber 13 from the inlet opening 11 to the outlet opening 12 in the direction of gravity.

[0094] In the operating state of the twin-shaft shredder 1, a first cutter disc unit 20 and a second cutter disc unit 30 are arranged in the shredding chamber 13 within the shredder housing 10. The first cutter disc unit comprises a first cutter disc block 21 with a plurality of first cutter discs 22. The first cutter discs 22 are arranged on a first hub body 23 at an axial distance from one another, such that a gap Z1 exists between each two adjacent first cutter discs 22. The gap Z1 is essentially a circumferential gap between two adjacent first cutter discs 22.

[0095] The second cutter disc unit 30 has a second cutter disc block 31 with a plurality of second cutter discs 32. The second cutter discs are arranged—analogously to the first cutter disc unit 20—on a second hub body 33, so that a gap Z2 exists between each two adjacent second cutter discs 32. The gap Z2 also essentially represents a circumferential gap between two adjacently arranged second cutter discs 32.

[0096] The first and second cutter disc units 20, 30 are rotatably mounted in the operating state, i.e., the first cutter disc unit 20 rotates about a first axis of rotation D1, and the second cutter disc unit 30 rotates about a second axis of rotation D2. In particular, it is provided that the first and second cutter disc units 20, 30 are driven in opposite directions during operation. For example, the first cutter disc unit 20 rotates clockwise, and the second cutter disc unit 30 rotates counterclockwise. In particular, it is provided that the first and second cutter disc units 20, 30 rotate at different speeds.

[0097] The first and second cutter disc units 20, 30 are arranged such that their axes of rotation D1, D2 are axially offset from one another, so that at least one of the first cutter discs 22 engages in a space Z2 between two adjacent second cutter discs 32, and at least one of the second cutter discs 32 engages in a space Z1 between two adjacent first cutter discs 22. For this purpose, the first and second cutter disc units 20, 30 are arranged such that their axes of rotation extend parallel to one another.

[0098] For the rotatable mounting of the first and second knife disk units 20, 30, they are rotatably mounted with corresponding bearing devices 41, 42, 43, 44 relative to the shredder housing, which is stationary in the operating state. For this purpose, a first bearing device 41 is arranged on the first knife disk unit 20 at a first axial end A1 and a second bearing device 42 is arranged at a second axial end A2, so that in an operating state the first knife disk block 21 is rotatably mounted about the first axis of rotation D1 relative to the shredder housing 10. Correspondingly, the third bearing device 43 is arranged on the second knife disk unit 30 at a third axial end A3 and the fourth bearing device 44 is arranged at a fourth axial end A4, so that in the operating state the second knife disk block 31 is rotatably mounted about the second axis of rotation D2 relative to the shredder housing 10.

[0099] The bearing devices 41, 42, 43, 44 each have a corresponding bearing unit 411, 421 and a corresponding bearing housing 412, 412, wherein the bearing unit is arranged within the bearing housing, i.e., the respective bearing unit is supported on the bearing housing via an outer ring of the bearing unit. Furthermore, the bearing devices 41, 42, 43, 44 each comprise shaft stubs 413, 423 onto which the bearing units 411, 421 are pushed.

[0100] The four bearing devices 41, 42, 43, 44 are arranged so as to be relatively movable relative to the shredding housing 10 between an operating position in the operating state and a maintenance position different from the operating position in the maintenance state. Provision is made here for the four bearing devices 41, 42, 43, 44 to be mechanically coupled to the respective cutter disk unit 20, 30 in the operating position for transmitting torque, and for the four bearing devices 41, 42, 43, 44 to be mechanically decoupled from the respective cutter disk unit 20, 30 in the maintenance position.

[0101] Figures 1 a and 1 b show the twin-shaft shredder in the operating position.

[0102] In the first preferred embodiment of the twin-shaft shredder 1, Figure 1a, it is provided that the first and second cutting disk units 20, 30 are driven by a single motor. Accordingly, a first motor of the first type 91 is provided as the first torque transmission device 90, which is mechanically coupled to the second cutting disk unit 30 in the operating state via a first torque transmission interface S1. The second cutting disk unit 30 is driven by the motor of the first type 91. For driving the first cutting disk unit 20, a gear 102 is provided as the second torque transmission device 100, which is mechanically coupled to the first cutting disk unit 20 in the operating state via a second torque transmission interface S2.The transmission 102 mechanically couples the second cutter disc unit 30 to the first cutter disc unit 20 for transmitting torque from the first cutter disc unit to the second cutter disc unit 30. The transmission is configured such that the rotational directions of the first and second cutter disc units 20, 30 are opposite and the rotational speeds are different.

[0103] In the second preferred embodiment of the twin-shaft shredder 1, Figure 1b, it is provided that the first and second cutting disk units 20, 30 are driven by two motors. As in the first embodiment, a first motor of the first type 91 is provided as the first torque transmission device 90, which is mechanically coupled to the second cutting disk unit 30 in the operating state via the first torque transmission interface S1. In this second embodiment of the twin-shaft shredder 1, the second cutting disk unit 30 is also driven by the motor of the first type 91. To drive the first cutting disk unit 20, a motor of the second type 101 is provided as the second torque transmission device 100, which is mechanically coupled to the first cutting disk unit 20 in the operating state via the second torque transmission interface S2.In this preferred embodiment, the motor of the first type and the motor of the second type are of identical construction. Furthermore, the two motors are operated in a coordinated manner such that the direction of rotation of the first and second cutting disc units 20, 30 is opposite and the rotational speeds are different.

[0104] In the operating state, the shaft stubs serve to transmit torque from the respective torque transmission device 90, 100 to the respective cutting disc unit 20, 30. For this purpose, in the operating position, the shaft stubs are mechanically coupled in the region of the axial ends A1, A2, A3, A4 of the cutting disc units 20, 30. Accordingly, in the maintenance position, the respective shaft stubs are mechanically decoupled from the axial ends A1, A2, A3, A4 of the cutting disc units 20, 30 and arranged at a distance from the axial ends A1, A2, A3, A4.

[0105] To transmit the torque from the respective torque transmission device 90, 100 to the respective cutting disk unit 20, 30, the shaft stubs have a special design. In both the first and second preferred embodiments of the twin-shaft shredder, the shaft stubs extend in the axial direction A between a first stub end section and a second stub end section. In the present case, the first and second stub end sections of the shaft stubs have a conical shaft section and a polygonal shaft section in cross-section. The conical shaft section is not self-locking.

[0106] To accommodate the shaft stubs in the operating position, the first and second cutter disc units 20, 30 have axial recesses at their axial ends A1, A2, A3, A4, into which the respective shaft stubs extend in the operating position. For this purpose, the axial recesses each have a conical recess section and a section with a polygonal inner circumferential surface, which correspond to the conical shaft section and the polygonal cross-sectional shaft section of the shaft stubs for transmitting the torque in the operating position.

[0107] Figure 2 is a schematic three-dimensional sectional view of the first preferred embodiment of the twin-shaft shredder 1 shown in Figure 1a. The sectional view shown in Figure 2 shows the twin-shaft shredder 1 in the maintenance position. In this position, the first and second bearing devices 41, 42 of the first cutter disk unit 20 are mechanically decoupled. For this purpose, the first and second bearing devices 41, 42, i.e. bearing housing, bearing unit and shaft stub, were pushed away from the first cutter disk unit 20 in the axial direction A, so that the first and second shaft stub 413, 423 are no longer engaged with the first cutter disk unit 20 in order to transmit torque.

[0108] To move the bearing devices 41, 42 from the operating position to the maintenance position, a guide device 50 is provided, which is designed as a linear guide. For this purpose, the bearing housing 412, 422 of the respective bearing device 41, 42 has through-openings in which guide pins (not shown) are guided. These guide pins extend outward from the outside of the shredder housing in the axial direction, parallel to the rotational axis D1 of the first blade disk unit 20.

[0109] Figure 2 also shows a screw connection as a fastening device 60, with which the bearing devices 41, 42 can be screwed to the outside of the shredder housing 10 in the operating position for operating the twin-shaft shredder 1. For this purpose, the shredder housing has, for example, blind holes with internal threads, and the bearing housings have through-holes through which screws for fastening the bearing devices 41, 42 to the shredder housing can be inserted and screwed into the shredder housing.

[0110] To position the bearing devices 41, 42 in the maintenance position, the screw connection 60 is first loosened, and then the bearing devices 41, 42 are pushed along the guide device 50 from the operating position into the maintenance position. To establish the operating state of the twin-shaft shredder, the bearing devices 41, 42 are pushed from the maintenance position into the operating position, and the screws of the screw connection 60 are screwed into the shredder housing 10.

[0111] In the first and second preferred embodiments of the twin-shaft shredder 1 shown in Figures 1a and 1b, a side wall of the shredder housing 10 is formed by a maintenance flap 70. The maintenance flap 70 is closed for the operation of the twin-shaft shredder 1 shown in Figures 1a and 1b; it is then in a closed position, so that the maintenance flap 70 seals off the shredding chamber from the surroundings of the shredder housing 10. Figure 3 shows the preferred embodiment of the twin-shaft shredder 1 shown in Figure 1a with the maintenance flap 70 open; the maintenance flap 70 is then in a removal position. It can be seen that the maintenance flap 70 releases the shredding chamber 13 in the removal position, so that the knife sliding units 10, 20 can be removed from the shredding chamber 13 or inserted into the shredding chamber 13.

[0112] It can be seen that the maintenance flap has a scraper 71 with scraper elements on its inside, which faces the comminution chamber when closed. The scraper elements are arranged at a distance from one another in the axial direction A and have a width such that they engage in the gaps Z2 between the second cutting discs of the second cutting disc unit. By means of the scraper, shredded solids that become caught between the second cutting discs after comminution are released and fed to the outlet opening by gravity. A corresponding scraper is located on the side wall of the shredder housing, which faces the comminution chamber on the side of the first cutting disc unit. This can be seen in Figure 7 with regard to the embodiment shown in Figure 1a.

[0113] Figure 4 shows the embodiment of the twin-shaft shredder shown in Figure 1a with a handling device 80 in a removal position. Figure 5 is a plan view of the embodiment shown in Figure 4. With the handling device 80, the knife disk units 20, 30 can be removed from the shredding chamber or inserted into the shredding chamber. For this purpose, the first and second knife disk units 20, 30 each have two handling grooves H. The handling grooves are formed circumferentially on the respective hub body 23, 33. The handling device 80 has two grippers 81 which engage in the respective handling grooves for removing or inserting the knife disk units 20, 30. This is shown in detail in Figure 6, a detailed view of the lateral three-dimensional view shown in Figure 5.

[0114] Figure 7 shows the embodiment of the twin-shaft shredder illustrated in Figure 1a with a first and second cutter disc unit 20, 30 removed from the shredding chamber 13, wherein the first cutter disc unit 20 is located on the grippers 81 of the handling device 80. This handling device 80 enables safe, fast, and easy assembly and disassembly of the cutter disc units 20, 30.

[0115] Figures 8a and 8b show a schematic two-dimensional side view of a modular system of a twin-shaft shredder in a first preferred embodiment (Figure 8a) and a second preferred embodiment (Figure 8b). These preferred embodiments, designed as a modular system, are based on the first and second preferred embodiments of twin-shaft shredders 1 shown in Figures 1a and 1b.

[0116] In both preferred embodiments, the modular system comprises a shredder housing 10 defining an internal shredding chamber 13, an inlet opening 11 in the shredder housing 10 for supplying solids to be shredded into the shredding chamber 13 and an outlet opening 12 in the shredder housing 10 for removing shredded solids from the shredding chamber 13, the outlet opening 12 being substantially opposite the inlet opening 11.

[0117] Furthermore, both embodiments have a first cutter disc unit 20 with a first cutter disc block 21 with a plurality of first cutter discs 22, which are arranged on a first hub body 23 such that there is a gap between each two adjacent first cutter discs, and a second cutter disc unit 30 with a second cutter disc block 31 with a plurality of second cutter discs 32, which are arranged on a second hub body 33 such that there is a gap between each two adjacent second cutter discs. The first and second cutter disc units are axially offset from one another with their axes of rotation such that at least one of the first cutter discs engages in a gap between each two adjacent second cutter discs and at least one of the second cutter discs engages in a gap between each two adjacent first cutter discs.

[0118] In both embodiments of the modular system, it is provided that a first bearing device 41 is arranged on the first cutter disc unit at a first axial end and a second bearing device 42 is arranged on a second axial end, so that in an operating state, the first cutter disc block is mounted rotatably about a first axis of rotation relative to the shredder housing 10, and that a third bearing device 43 is arranged on the second cutter disc unit at a third axial end and a fourth bearing device 44 is arranged on a fourth axial end, so that in the operating state, the second cutter disc block is mounted rotatably about a second axis of rotation relative to the shredder housing 10. Furthermore, both preferred embodiments comprise a first torque transmission device 90 arranged on the first cutter disc unit, which is or can be mechanically coupled to the first cutter disc unit.and a second torque transmission device 100 arranged on the second cutter disc unit, which is mechanically coupled or coupled to the second cutter disc unit.

[0119] In both preferred embodiments of the modular system, a motor of the first type is further provided as the first torque transmission device, which is mechanically coupled to the first cutter disk unit via a first torque transmission interface S1.

[0120] In the first preferred embodiment of the modular system shown in Figure 8a, a gear mechanism is provided as the second torque transmission device, which mechanically couples the first cutter disc unit to the second cutter disc unit via the second torque transmission interface S2. The gear mechanism is thus designed to mechanically couple the second cutter disc unit 30 to the first cutter disc unit for transmitting torque from the first cutter disc unit to the second cutter disc unit 30. Thus, the motor of the first design drives the second cutter disc unit via the first cutter disc unit and the gear mechanism.

[0121] In the second preferred embodiment of the modular system shown in Figure 8b, a second-type motor is provided as the second torque transmission device, which is mechanically coupled to the second cutter disc unit via the second torque transmission interface SS. It is preferred that the first-type motor corresponds to the second-type motor. Thus, in this second preferred embodiment, the two cutter disc units are each driven by their own "dedicated" motor.

[0122] The modular system has the advantage that the second cutting disc unit can be driven via the same second interface either via the gearbox or via the motor of the second type.

[0123] Figure 9 shows a schematic block diagram of a method 1000 for disassembling a twin-shaft shredder 1 in a preferred embodiment. The method 1000 can, in particular, relate to the disassembly of the previously described twin-shaft shredder 1. Several method steps are required for disassembling the twin-shaft shredder 1. The block diagram schematically illustrated here provides five method steps for disassembling the twin-shaft shredder.

[0124] First, a shredder housing 10 is to be provided 1010, which has a maintenance flap 70 for opening or closing a shredding chamber 13 located inside the shredder housing 10 and for removing or inserting a first cutter disc unit and a second cutter disc unit in the maintenance state.In the operating state, the first and second knife disk units 20, 301 are arranged within the comminution chamber 13, each of which is rotatably mounted relative to the comminutor housing 10 via two bearing devices, wherein the four bearing devices are each arranged to be movable between an operating position in the operating state and a maintenance position in the maintenance state, wherein in the operating position, at least one of the four bearing devices is mechanically coupled to the respective knife disk unit for transmitting a torque, and in the maintenance position, at least one of the four bearing devices is mechanically decoupled from the respective knife disk unit.

[0125] In a next method step, the maintenance flap 70 is opened 1020, so that the maintenance flap 70 is moved from a closed position to a removal position, and the comminution chamber 13 is exposed to the surroundings of the comminutor housing 10 for removal of the at least one cutter disk unit. Subsequently, at least one of the bearing devices is displaced 1030 from the operating position to the maintenance position, so that the displaced bearing device is mechanically decoupled from the corresponding cutter disk unit. The cutter disk unit, mechanically decoupled from the at least one bearing device 41, 42, 43, 44, can then be removed 1040, for example, for maintenance purposes.

[0126] In the preferred embodiment described here, it is further provided that the twin-shaft shredder 1 has a fastening device so that the at least one bearing device is fastened to the shredder housing in the operating position. Accordingly, before the step of moving 1030 the at least one bearing device, a release 1050 of the at least one bearing device to be moved is required. Figure 10 shows a schematic block diagram of a method 2000 for assembling a twin-shaft shredder 1 in a preferred embodiment. The method 2000 can in particular relate to the assembly of the previously described twin-shaft shredder 1. Several method steps are required for assembling the twin-shaft shredder 1. In the block diagram shown schematically here, six method steps are provided for assembling the twin-shaft shredder.

[0127] Firstly, there is a shredder housing 10 with a maintenance flap 70 for opening or closing a shredding chamber 13 located inside the shredder housing 10 and for removing orto provide 1010 for inserting a first cutter disc unit and a second cutter disc unit in a maintenance state, wherein in an operating state, the first and second cutter disc units 20, 30 are arranged within the comminution chamber 13, each of which is rotatably mounted relative to the comminutor housing 10 via two bearing devices, wherein at least one of the bearing devices is arranged to be movable between an operating position in the operating state and a maintenance position in the maintenance state, wherein in the operating position, at least one of the four bearing devices is mechanically coupled to the respective cutter disc unit for transmitting a torque, and in the maintenance position, at least one of the four bearing devices is mechanically decoupled from the respective cutter disc unit. Furthermore, the first and second cutter disc units to be inserted are to be provided 2020.

[0128] The provided first and second cutter disc units are to be inserted into the internal comminution chamber 13. This can preferably be done using a handling device 80. Subsequently, the at least one bearing device 41, 42, 43, 44 is moved 2040 from the maintenance position into the operating position, so that the at least one bearing device is mechanically coupled to the respective cutter disc unit for transmitting torque. In this operating position, the at least one bearing device is fastened 2060 to the comminutor housing using the fastening device.

[0129] For the operating state of the shredder, it is further provided to close the maintenance flap 70 2050, so that the maintenance flap 70 is moved from a removal position to a closed position and the shredding chamber 13 is closed from the environment during the operating state.

[0130] 1 twin-shaft shredder

[0131] 2 solids

[0132] 3 crushed solids 10 crusher housings

[0133] 11 Inlet opening

[0134] 12 Outlet opening

[0135] 13 Crushing room

[0136] 20 first knife disc unit 21 first knife disc block

[0137] 22 first knife discs

[0138] 23 first hub body

[0139] 231 first axial recess

[0140] 232 second axial recess 30 second knife disc unit

[0141] 31 second knife disc block

[0142] 32 second knife discs

[0143] 33 second hub body 41 first bearing device

[0144] 411 first storage unit

[0145] 412 first bearing housing

[0146] 413 first shaft stub 42 second bearing device

[0147] 421 second storage unit

[0148] 422 second bearing housing

[0149] 423 second shaft stub

[0150] 43 third bearing device 44 fourth bearing device

[0151] 50 guide device

[0152] 51 guide bolts

[0153] 60 fastening device

[0154] 61 Screw connection 70 Maintenance flap

[0155] 71 scrapers

[0156] 80 Handling device

[0157] 81 Gripper 90 First torque transmission device

[0158] 100 second torque transmission device

[0159] 101 Second-type engine

[0160] 102 gearboxes

[0161] A1 first axial end

[0162] A2 second axial end

[0163] A3 third axial end

[0164] A4 fourth axial end

[0165] D1 first axis of rotation

[0166] D2 second axis of rotation

[0167] H Handling groove

[0168] 51 first torque transmission interface

[0169] 52 second torque transmission interface

[0170] Z1 , Z2 space

Claims

Claims 1 . A twin-shaft shredder (1) for shredding solids (2) or solids in liquids, comprising: a shredder housing (10) defining an internal shredding chamber (13), an inlet opening (11) in the shredder housing (10) for supplying solids (2) or solids in liquids into the shredding chamber (13), an outlet opening (12) in the shredder housing (10) for discharging shredded solids (3) or shredded solids in liquids from the shredding chamber (13), wherein the outlet opening (12) is preferably substantially opposite the inlet opening (11), a first cutter disc unit (20) having a first cutter disc block (21) with a plurality of first cutter discs (22) arranged on a first hub body (23) such that there is a gap (Z1) between each two adjacent first cutter discs (22),a second cutter disc unit (30) with a second cutter disc block (31) with a plurality of second cutter discs (32) which are arranged on a second hub body (33) in such a way that a gap (Z2) exists between two adjacent second cutter discs (32), wherein the first and second cutter disc units (20, 30) are axially offset from one another with their axes of rotation (D1, D2) so that at least one of the first cutter discs (22) engages in a gap (Z2) between two adjacent second cutter discs (32) and at least one of the second cutter discs (32) engages in a gap (Z1) between two adjacent first cutter discs (22), on the first knife disc unit (20) at a first axial end (A1) a first bearing device (41) and at a second axial end (A2) a second bearing device (42) is arranged, so that in an operating state the first knife disc block (21) is rotatably mounted about a first axis of rotation (D1) relative to the shredder housing (10), on the second knife disc unit (30) at a third axial end (A3) a third bearing device (43) and at a fourth axial end (A4) a fourth bearing device (44) is arranged, so that in the operating state the second knife disc block (31) is rotatably mounted about a second axis of rotation (D2) relative to the shredder housing (10), characterized in that at least one of the four bearing devices (41, 42, 43,44) is arranged so as to be relatively movable relative to the comminution housing (10) between an operating position in the operating state and a maintenance position different from the operating position in the maintenance state, wherein in the operating position the at least one of the four bearing devices (41, 42, 43, 44) is mechanically coupled to the respective cutter disc unit (20, 30) for transmitting a torque and in the maintenance position at least one of the four bearing devices (41, 42, 43, 44) is mechanically decoupled from the respective knife disc unit (20, 30).

2. Twin-shaft shredder (1) according to the preceding claim 1, wherein the first bearing device (41) comprises a first bearing unit (411) and a first bearing housing (412), wherein preferably the first bearing unit (411) is arranged within the first bearing housing; and / or the second bearing device (42) comprises a second bearing unit (421) and a second bearing housing (422), wherein preferably the second Bearing unit (421) is arranged within the second bearing housing; and / or the third bearing device (43) comprises a third bearing unit and a third bearing housing, wherein the third bearing unit is preferably arranged within the third bearing housing; and / or the fourth bearing device (44) comprises a fourth bearing unit and a fourth bearing housing, wherein the fourth bearing unit is preferably arranged within the fourth bearing housing.

3. Twin-shaft shredder (1) according to the preceding claim, wherein the first bearing device (41) has a first shaft stub (413) which, in the operating position, is mechanically coupled to the first cutter disc unit (20) for transmitting a torque in the region of the first axial end (A1), and, in the maintenance position, is mechanically decoupled from the first cutter disc unit (20) and / or is arranged at a distance from the first axial end (A1); and / or the second bearing device (42) has a second shaft stub (423) which, in the operating position, is mechanically coupled to the first cutter disc unit (20) for transmitting a torque in the region of the second axial end (A2), and, in the maintenance position, is mechanically decoupled from the first cutter disc unit (20) and / or is arranged at a distance from the second axial end (A2);and / or the third bearing device (43) has a third shaft stub which, in the operating position, is mechanically coupled to the second cutter disc unit for transmitting a torque in the region of the third end, and, in the maintenance position, is mechanically decoupled from the second cutter disc unit and / or is arranged at a distance from the third end; and / or the fourth bearing device (44) has a fourth shaft stub which, in the operating position, is mechanically coupled to the second cutter disc unit for transmitting a torque in the region of the fourth end; is mechanically coupled and in the maintenance position is mechanically decoupled from the second knife disc unit and / or is arranged at a distance from the fourth end.

4. Twin-shaft shredder (1) according to the preceding claim, wherein the first stub shaft (413) extends in the axial direction between a first stub end section and a second stub end section, wherein the first stub end section o has a conically shaped shaft section, which is preferably not self-locking, and / or o has a shaft section which is polygonal in cross-section and which is designed to transmit a torque between the first stub shaft and the first knife disk unit (20) in the operating position;and / or the second shaft stub (423) extends in the axial direction between a first stub end section and a second stub end section, wherein the first stub end section o has a conically shaped shaft section which is preferably not self-locking, and / or o has a shaft section which is polygonal in cross-section and which is designed to transmit a torque between the second shaft stub and the first knife disk unit (20) in the operating position; and / or the third shaft stub extends in the axial direction between a first stub end section and a second stub end section, wherein the first stub end section o has a conically shaped shaft section which is preferably not self-locking, and / or; o has a shaft section with a polygonal cross-section, which is designed to transmit a torque between the third shaft stub and the second cutter disc unit (30) in the operating position; and / or the fourth shaft stub extends in the axial direction between a first stub end section and a second stub end section, wherein the first stub end section o has a conically shaped shaft section, which is preferably not self-locking, and / or o has a shaft section with a polygonal cross-section, which is designed to transmit a torque between the fourth shaft stub and the second cutter disc unit (30) in the operating position.

5. Twin-shaft shredder (1) according to one of the preceding claims, wherein the first knife disk unit (20) o has a first axial recess (231) at the first axial end (A1), into which the first shaft stub (413) extends in the operating position, and / or o has a second axial recess (232) at the second end, into which the second shaft stub (423) extends in the operating position; and / or the second knife disk unit (30) o has a third axial recess at the third end, into which the third shaft stub extends in the operating position, and / or o has a fourth axial recess at the fourth end, into which the fourth shaft stub extends in the operating position.

6. Twin-shaft shredder (1) according to the preceding claim, wherein the first axial recess has a conically shaped recess section, which is preferably not self-locking, and is designed to receive the conically shaped shaft section of the first shaft stub, and / or has a section with a polygonal inner circumferential surface, which is designed to receive the shaft section of the first shaft stub, which has a polygonal cross-section; and / or the second axial recess has a conically shaped recess section, which is preferably not self-locking, and is designed to receive the conically shaped shaft section of the second shaft stub, and / or has a section with a polygonal inner circumferential surface, which is designed to receive the shaft section of the second shaft stub, which has a polygonal cross-section;and / or the third axial recess has a conically shaped recess section, which is preferably not self-locking, and is designed to receive the conically shaped shaft section of the third shaft stub, and / or has a section with a polygonal inner circumferential surface, which is designed to receive the shaft section of the third shaft stub, which has a polygonal cross-section; and / or the fourth axial recess has a conically shaped recess section, which is preferably not self-locking, and is designed to receive the conically shaped shaft section of the fourth shaft stub, and / or has a section with a polygonal inner circumferential surface, which is designed to receive the shaft section of the fourth shaft stub, which has a polygonal cross-section.; 7. Twin-shaft shredder (1) according to one of the preceding claims 1 - 2, comprising a guide device (50) for guiding the movement of the at least one bearing device (41, 42, 43, 44), in particular the Bearing housing and / or the bearing unit and / or the shaft stub of the at least one bearing device (41, 42, 43, 44), between the operating position and the maintenance position.

8. Twin-shaft shredder (1) according to the preceding claim, wherein the guide device (50) is or comprises a linear guide, wherein the linear guide is formed in particular by at least one guide pin (51) which preferably extends from the shredder housing (10).

9. Twin-shaft shredder (1) according to one of the preceding claims, wherein the guide device (50) is arranged relative to the shredder housing (10) in such a way that it enables the at least one bearing device (41, 42, 43, 44) to be guided parallel to the first and / or second axis of rotation (D1, D2) between the operating position and the maintenance position.

10. Twin-shaft shredder (1) according to one of the preceding claims, wherein the guide device (50) is designed to displace the at least one bearing device (41, 42, 43, 44) between the operating position and the maintenance position parallel to the first and / or second axis of rotation (D1, D2). 1 1. Twin-shaft shredder (1) according to one of the preceding claims, comprising a fastening device (60) for fastening, preferably for axial fastening, the at least one bearing device (41, 42, 43, 44), in particular the bearing housing or the shaft stub of the at least one bearing device (41, 42, 43, 44), to the shredder housing (10) in the operating position; or for axial fastening of the shaft stub to the bearing housing of the at least one bearing device (41, 42, 43, 44).

12. Twin-shaft shredder (1) according to one of the preceding claims, wherein the fastening device (60) is designed for non-positive and / or positive fastening.

13. Twin-shaft shredder (1) according to one of the preceding claims, wherein the fastening device (60) is or comprises a screw connection (61) and / or a clamp connection.

14. Twin-shaft shredder (1) according to one of the preceding claims, wherein the shredder housing (10) has at least one maintenance flap (70) for opening or closing the internal shredding chamber (13) and for removing or inserting the first knife disk unit (20) and / or the second knife disk unit (30) from or into the internal shredding chamber (13) in the maintenance state, which maintenance flap at least partially releases the internal shredding chamber (13) in a removal position and closes the internal shredding chamber (13) from the surroundings of the shredder housing (10) in a closing position different from the removal position.

15. Twin-shaft shredder (1) according to the preceding claim, wherein the at least one maintenance flap (70) has a scraper (71) with scraper elements which, in the closed position of the maintenance flap (70), engage in the space between two adjacent knife disks of one of the two knife disk units.

16. Twin-shaft shredder (1) according to one of the preceding claims, the hub body of at least one of the two knife disc units (20, 30) having at least one handling groove (H) for handling the at least one knife disc unit with a handling device (80) during removal from or insertion into the internal shredding chamber (13) in the maintenance state, wherein the at least one handling groove (H) extends with a main direction of extension orthogonal to the axis of rotation of the at least one knife disc unit.

17. Twin-shaft shredder (1) according to the preceding claim, wherein the at least one handling groove (H) is formed between two adjacent knife discs of the at least one knife disc unit on the hub body of the at least one knife disc unit, wherein the handling groove (H) preferably has a main extension direction in the circumferential direction of the hub body.

18. Twin-shaft shredder (1) according to one of the preceding claims, comprising the handling device (80) for removing from or inserting into the internal shredding chamber (13) in the maintenance state of at least one of the two knife disc units (20, 30) orthogonal to the axis of rotation (D1, D2) of the respective knife disc unit (20, 30).

19. Twin-shaft shredder (1) according to the preceding claim, wherein the handling device (80) has at least one gripper (81) which at least partially encompasses the hub body of the corresponding knife disc unit between two adjacent knife discs for removing or inserting at least one of the two knife disc units.

20. Twin-shaft shredder (1) according to one of the preceding claims, wherein for removing or inserting at least one of the two knife disc units, the at least one gripper (81) engages in each case in one of the at least one handling groove (H).

21. Twin-shaft shredder (1) according to one of the preceding claims, comprising as a first torque transmission device (90) a motor of the first type (91) which is mechanically coupled or is mechanically coupled to the second cutting disc unit via a first torque transmission interface (S1), and / or as a second torque transmission device (100) a motor of the second type (101) or a gear (102) which is mechanically coupled or is mechanically coupled to the first cutting disc unit via a second torque transmission interface (S2).

22. Twin-shaft shredder (1) according to the preceding claim, wherein the gear mechanism mechanically couples the second cutter disc unit (30) to the first cutter disc unit for transmitting a torque from the first cutter disc unit to the second cutter disc unit (30) or the gear mechanism mechanically couples the second cutter disc unit (30) to the second cutter disc unit (30) - the first knife disc unit and the second knife disc unit can be mechanically coupled.

23. Twin-shaft shredder (1) according to the preceding claim, wherein the motor of the first type is different from the motor of the second type or the motor of the first type corresponds to the motor of the second type.

24. Method (1000) for disassembling a twin-shaft shredder (1), in particular a twin-shaft shredder (1) according to one of the preceding claims, characterized by the steps: Providing (1010) a shredder housing (10) with a maintenance flap (70) for opening or closing a shredding chamber (13) located inside the shredder housing (10) and for removing orfor inserting a first cutter disc unit and / or a second cutter disc unit in a maintenance state, wherein in an operating state the first and second cutter disc units (20, 30) are arranged within the comminution chamber (13), each of which is rotatably mounted relative to the comminutor housing (10) via two bearing devices, wherein at least one of the bearing devices is arranged to be movable between an operating position in the operating state and a maintenance position in the maintenance state, wherein in the operating position the at least one of the four bearing devices is mechanically coupled to the respective cutter disc unit for transmitting a torque and in the maintenance position the at least one of the four bearing devices is mechanically decoupled from the respective cutter disc unit. Opening (1020) the maintenance flap (70) so that the maintenance flap (70) is moved from a closed position to a removal position and the shredding chamber (13) is released to the environment of the shredder housing (10) for removing the at least one knife disc unit, Moving (1030) at least one of the bearing devices from the operating position to the maintenance position, so that the moved bearing device is mechanically decoupled from the corresponding cutter disc unit, Removing (1040) the knife disc unit mechanically decoupled from the at least one storage device (41, 42, 43, 44), preferably with a handling device (80).

25. Method according to the preceding claim, comprising the step: Release (1050) of a fastening device (60) of the at least one bearing device to be moved.

26. Method (2000) for assembling a twin-shaft shredder (1), in particular a twin-shaft shredder (1) according to one of the preceding claims, characterized by the steps: Providing (2010) a shredder housing (10) with a maintenance flap (70) for opening or closing a shredding chamber (13) located inside the shredder housing (10) and for removing orfor inserting a first cutter disc unit and / or a second cutter disc unit in a maintenance state, wherein in an operating state the first and second cutter disc units (20, 30) are arranged within the comminution chamber (13), each of which is rotatably mounted relative to the comminutor housing (10) via two bearing devices, wherein at least one of the bearing devices is arranged to be movable between an operating position in the operating state and a maintenance position in the maintenance state, wherein in the operating position the at least one of the four bearing devices is mechanically coupled to the respective cutter disc unit for transmitting a torque and in the maintenance position the at least one of the four bearing devices is mechanically decoupled from the respective cutter disc unit. Providing (2020) the first and / or second knife disc unit to be inserted; Inserting (2030) the first and / or the second knife disc unit into the internal comminution chamber (13), preferably with a handling device (80); Moving (2040) the at least one bearing device (41, 42, 43, 44) from the maintenance position into the operating position, so that the at least one bearing device is mechanically coupled to the respective cutter disc unit for transmitting a torque; and Closing (2050) the maintenance flap (70) so that the maintenance flap (70) is moved from a removal position to a closing position and the shredding chamber (13) is closed off from the environment for the operating state.

27. Method according to the preceding claim, comprising the step: Fastening (2060) a fastening device (60) of the at least one bearing device (41, 42, 43, 44) to the shredder housing (10).

28. Modular system of a twin-shaft shredder (1), in particular of twin-shaft shredders (1) according to the preceding claims, comprising: a shredder housing (10) defining an internal shredding chamber (13), an inlet opening (11) in the shredder housing (10) for supplying solids to be shredded into the shredding chamber (13), an outlet opening (12) in the shredder housing (10) for removing shredded solids from the shredding chamber (13), wherein the outlet opening (12) is preferably substantially opposite the inlet opening (11), a first cutter disc unit (20) with a first cutter disc block (21 ) with a plurality of first knife discs (22) which are thus connected to a first Hub bodies (23) are arranged such that there is a gap between each two adjacent first knife disks, a second knife disk unit (30) with a second knife disk block (31) with a plurality of second knife disks (32) which are arranged on a second hub body (33) such that there is a gap between each two adjacent second knife disks, wherein the first and second knife disk units are axially offset from one another with their axes of rotation such that at least one of the first knife disks engages in a gap between each two adjacent second knife disks and at least one of the second knife disks engages in a gap between each two adjacent first knife disks, a first bearing device (41) is arranged on the first knife disk unit at a first axial end and a second bearing device (42) is arranged at a second axial end,so that in an operating state, the first knife disc block is mounted so as to be rotatable about a first axis of rotation relative to the shredder housing (10), a third bearing device (43) is arranged on the second knife disc unit at a third axial end and a fourth bearing device (44) is arranged at a fourth axial end, so that in the operating state, the second knife disc block is mounted so as to be rotatable about a second axis of rotation relative to the shredder housing (10), a first torque transmission device (90) arranged on the first knife disc unit, which is or is mechanically coupled to the first knife disc unit, and a second torque transmission device (100) arranged on the second knife disc unit, which is or is mechanically coupled to the second knife disc unit, characterized in that, the modular system has as a first torque transmission device o a motor of the first type which is mechanically coupled or mechanically coupled to the first cutting disc unit via a first torque transmission interface (S1), and the modular system has as a second torque transmission device o a motor of the second type which is mechanically coupled or mechanically coupled to the second cutting disc unit via a second torque transmission interface (S2), and o a gear which is mechanically coupled or mechanically coupled to the second cutting disc unit via the second torque transmission interface (S2).

29. Modular system according to the preceding claim, wherein the transmission comprises the second Knife disc unit (30) with the first knife disc unit for transmitting a torque from the first knife disc unit to the second Knife disc unit (30) mechanically coupled or the gear for transmitting a torque from the first knife disc unit to the second The cutting disc unit (30) is mechanically coupled to the first cutting disc unit and the second cutting disc unit.

30. Modular system according to one of the preceding claims, wherein the motor of the first type is different from the motor of the second type or the motor of the first type corresponds to the motor of the second type.

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