QUICK-CHANGE BLADE DEVICE

Description

[0001] The present invention relates to a quick-change blade change device for a feed mixer, a mixing auger for a feed mixer, and a feed mixer. Furthermore, the present invention relates to a method for changing a blade of a mixing auger for a feed mixer. background

[0002] Feed mixer wagons are used in a known manner to mix feed in the form of grass silage, maize silage, hay, concentrated feed, and the like, transport it to the feeding site, and dispense it there. For this purpose, feed mixer wagons have a feed mixer hopper with a floor and a peripheral wall that extends upwards from the floor in a predominantly vertical or inclined direction. Mixing takes place by means of one or more mixing augers arranged within the feed mixer hopper, usually with a vertical axis of rotation. The mixing augers usually have a conical outer contour, i.e., the auger diameter is larger near the floor than at the upper end.

[0003] Typically, knives are located on the mixing auger, particularly on its flight, to chop and / or mix the feed. These knives are attached to a flight of the mixing auger with a screw connection (usually countersunk screws). The knives wear out with use, so they must be replaced at regular intervals (usually after approximately one to five years). Replacing the knives is very time-consuming, as the screw connections become very difficult to loosen after this period and sometimes have to be cut off or drilled out. New or reconditioned knives are then screwed back on.

[0004] In addition, the blades or the corresponding screw flight often have additional holes that allow for angle adjustment. Even for angle adjustment, the screws on conventional mixing screws have to be loosened and retightened, which is a considerable effort.

[0005] In addition to the considerable labor involved, changing blades and adjusting the angle also poses a very high risk of injury due to the limited space in the feed mixer hopper. The mechanic must therefore get very close to the blades being replaced, increasing the risk of injury.

[0006] For example, EP 2 674 028 A2 discloses a cutting blade holder for attaching a cutting blade 4 to a screw thread wall of a mixing auger of a feed mixer wagon. Furthermore, EP 2 554 047 A1 discloses a blade that can be used, for example, in machines for chopping grain and / or fibrous material. The object of the present invention is therefore to simplify and make the replacement of blades and / or the angle adjustment of the blades safer. Furthermore, the time required for changing / adjusting the blades should be reduced. Description of the invention

[0007] The above object is achieved, at least in part, by a quick-change blade device for a feed mixer, a mixing auger for a feed mixer, and a feed mixer according to the independent product claims. Furthermore, the above object is achieved, at least in part, by a method according to the independent method claim.

[0008] In particular, the object is achieved by a quick-change blade device for a mixing auger of a feed mixer wagon. The quick-change blade device comprises a blade and a mounting plate, wherein the blade can be releasably fixed to the mounting plate. The mounting plate can be a separate component or formed integrally with the mixing auger. The mounting plate has at least one blade receiving element and at least one locking element. The locking element can be arranged at a distance from or in close proximity to the blade receiving element. Likewise, the at least one locking element can be arranged on the blade receiving element and / or formed integrally with it.

[0009] The knife has at least one complementary receiving element and at least one complementary locking element. The knife and the mounting plate are configured to releasably fix the knife to the mounting plate in such a way that the knife can be pushed onto the knife receiving element with the complementary receiving element in a mounting direction A, so that the complementary receiving element abuts the knife receiving element. Furthermore, the knife and the mounting plate are configured so that the locking element can lock with the complementary locking element, so that movement of the knife counter to the mounting direction A is blocked when the complementary receiving element abuts the knife receiving element.

[0010] The mounting direction A can be oriented essentially in the radial direction of the mixing screw. Likewise, the mounting direction can essentially be a circumferential direction of the mixing screw. In this case, the blade is pivoted in the mounting direction A (preferably counter to the direction of rotation of the mixing screw) to be releasably fixed, or is displaced translationally. Particularly preferably, the blade is displaced counter to the direction of rotation of the mixing screw for mounting.

[0011] The mounting plate is designed to be attached to a mixing auger for a feed mixer wagon. In an alternative embodiment of the invention, the mounting plate is formed integrally with a mixing auger, in particular a screw flight of the mixing auger, of a feed mixer wagon.

[0012] In particular, a screw flight of a mixing screw can have one or more (essentially) flat areas. A flat area is an area without a pitch. A substantially flat area is an area with a pitch of less than 600 mm, in particular less than 400 mm or less than 200 mm. The pitch (also referred to as the pitch) of the mixing screw refers to the distance the mixing screw winds in the direction of the rotation axis during one full rotation.

[0013] The mounting plate(s) may be mounted in this (substantially) planar area(s), or a corresponding mounting plate may be formed integrally with one of these areas.

[0014] In one embodiment, the mixing screw can have at least one canted screw flight (helix). This canted screw flight has regions of varying pitch. (Substantially) flat regions alternate with regions of higher pitch. These regions of higher pitch typically have a pitch greater than 200 mm, in particular greater than 400 mm, or greater than 600 mm.

[0015] Steep sections can be inserted between a (substantially) flat section and a section with a higher pitch. These steep sections compensate for the reduced pitch of the (substantially) flat sections, so that the average pitch of the mixing screw is, for example, in a range of 200 to 600 mm, in particular in a range of 400 to 600 mm. If the mounting plate is formed integrally with the mixing screw, the at least one knife receiving element and the at least one locking element can be arranged on the underside of a screw flight, in particular in a substantially flat section, or in a flat section of the screw flight.

[0016] By removably securing a knife to the mounting plate, a mixing screw can be easily equipped with knives, or the knives can be easily replaced. In particular, the mounting plate can rest on a first side of a mixing screw helix when the mounting plate is attached to the mixing screw. The knife receiving element and the locking element can be arranged on the opposite side of the mounting plate.

[0017] In particular, the blade receiving element and / or the locking element can protrude from one side of the mounting plate. If the mounting plate is formed integrally with the mixing screw, the blade receiving element and / or the locking element can protrude from the underside of a screw flight of the mixing screw. The blade receiving element and / or the locking element can, for example, be fastened to a base body of the mounting plate (welded, screwed, riveted, etc.) or formed integrally with the base body of the mounting plate. Accordingly, the blade receiving element and / or the locking element can be formed integrally with the mixing screw. For example, the blade receiving element and / or the locking element can be stamped into the mounting plate and / or formed by bending a section of the base body of the mounting plate.This applies accordingly to the (essentially) flat areas of a corresponding mixing screw.

[0018] The locking element can comprise a sliding surface and a locking surface. If the blade is displaced in the assembly direction A, the complementary locking element can first slide over the sliding surface of the locking element and then, after passing the sliding surface, lock. Likewise, the locking element can be formed integrally with the blade receiving element, for example, in particular as a locking surface on the blade receiving element.

[0019] During locking, a locking surface of the complementary locking element preferably comes into contact with the locking surface of the locking element in order to positively lock the locking element with the complementary locking element.

[0020] For this purpose, the complementary locking element is preferably formed as a cutout, aperture, or recess integral with the blade. Likewise, the complementary locking element can be arranged on a spring arm of the blade, for example, at a free end of a spring arm. This spring arm can be formed integrally with the blade.

[0021] The complementary receiving element of the knife can be formed, for example, by an edge contour of the knife and / or by an inner contour of the knife. In one embodiment, the complementary receiving element is arranged opposite a cutting edge of the knife and formed by an edge contour of the knife. For example, the complementary receiving element can be formed as a recess, in particular as a U-shaped recess, in the edge contour of the knife. In another embodiment, the complementary receiving element of the knife can be formed, for example, as an inner contour of the knife, in particular as a narrow part of a keyhole-shaped inner contour of the knife. The inner contour is formed, for example, by an opening in the knife.

[0022] The mounting plate and / or the blade can be made of metal, in particular boron steel, chrome-vanadium steel, or other steel. The thickness of the mounting plate is, for example, between 3 mm and 10 mm, preferably between 4 and 8 mm, most preferably between 5 mm and 6 mm. The thickness of the blade is, for example, between 3 mm and 10 mm, preferably between 5 and 8 mm.

[0023] The base body of the mounting plate and / or the blade (and / or the stiffening element described below) can be manufactured, for example, by machining, water jet cutting or laser cutting.

[0024] The knife changing device enables a simple, safe, and quick changeover process, as the knife is secured via the knife holder and locking element. This locking mechanism is reversible, allowing for quick and easy installation or replacement of the knife, even in the confined spaces of a feed mixing tank.

[0025] The knife may further comprise at least one guide receptacle, and the mounting plate may comprise at least one knife guide. The guide receptacle may interact with the knife guide in such a way that an angular position of the knife relative to the mounting plate is determined when the knife is releasably secured to the mounting plate.

[0026] The at least one knife guide can protrude from one side of the mounting plate, in particular from the side from which the knife receiving element and / or the locking element also protrude. The at least one knife guide can be designed in the form of a bolt, a rib, a web and / or the like. The knife guide can be fastened to the base body of the mounting plate (welded, screwed, riveted, etc.) or formed integrally with the base body of the mounting plate. For example, the knife guide can be embossed into the mounting plate and / or formed by bending a section of the base body of the mounting plate. If the mounting plate is formed integrally with the mixing screw, this applies accordingly to the mixing screw or its at least one helix.

[0027] The at least one guide receptacle is preferably formed as a cutout, opening or recess integrally in the knife. In particular, the shape of the guide receptacle is adapted to the shape of the knife guide. If the knife guide is designed as a bolt, for example, the guide receptacle can be provided in the form of a bore (blind hole or through hole). If the knife guide is designed as a rib or web, the guide receptacle can be provided in the form of an elongated hole or a groove. It is also possible for the at least one guide receptacle to be formed by an edge contour of the knife (e.g. by recesses). In order to determine the angular position of the knife relative to the mounting plate, the knife guide can be at least partially received by the guide receptacle.

[0028] In particular, the mounting plate can have a plurality (at least two) of knife guides. The knife can accordingly have a plurality of guide receptacles. To determine the angular position of the knife relative to the mounting plate, a first knife guide can interact with a first guide receptacle, and a second knife guide with a second guide receptacle. This improves the angular stability of the fixed knife.

[0029] Furthermore, the knife can have a plurality of guide receptacles, wherein the guide receptacles are arranged at different angular positions on (or in) the knife. This plurality of guide receptacles can be assigned to a knife guide of the mounting plate. Depending on which of the guide receptacles engages with the knife guide, the knife can be easily fixed at different angular positions on the mounting plate or the helix. The different angular positions of the knife influence the cutting effect and the effort required to rotate the mixing auger in the feed mixer hopper. In this way, the mixing auger can be easily adapted to the feed to be mixed (for example a mixture of grass silage, maize silage, hay, concentrated feed and / or the like) by changing the angular position of the knife.

[0030] At least one blade guide of the mounting plate (preferably all blade guides) can protrude from the mounting plate and have a blade locking element that secures the blade in a normal direction Z of the mounting plate when the blade is releasably fixed to the mounting plate. The blade locking element can be designed, for example, as a projection that projects beyond a portion of the blade when the blade guide is arranged in the guide receptacle and the locking element is locked with the complementary locking element. The projection then secures the blade in the normal direction Z of the mounting plate.

[0031] Furthermore, the at least one blade receiving element can have a collar which at least partially projects beyond the complementary receiving element of the blade when the blade is releasably fixed to the mounting plate. The collar secures the blade in the normal direction of the mounting plate. In particular, the blade receiving element can be a substantially cylindrical bolt which has a collar on a side facing away from the mounting plate. The collar can be arranged circumferentially on the blade receiving element or only partially enclose the blade receiving element. Likewise, the collar can be interrupted at least at one point. The collar can additionally secure the blade in the normal direction of the mounting plate.

[0032] The knife can also include a spring element. The spring element then has the complementary locking element. Providing a spring element that has the complementary locking element simplifies sliding the knife onto the mounting plate. For sliding, the spring element and thus the complementary locking element can be deflected so that it slides over the locking element or can be pushed over the locking element without coming into contact with it. After passing the locking element, the spring element can return to its undeflected position, thus locking the complementary locking element to the locking element.

[0033] The spring element can be formed integrally with the knife. This can be achieved by introducing a suitable structure into the knife (e.g. milled, water jet cut, laser cut, or the like). In particular, the spring element can comprise at least one spring arm, at the free end of which the complementary locking element is arranged. In a preferred embodiment, the spring element comprises two spring arms, the free ends of which are connected to a web. In this case, the complementary locking element can be arranged on the web. The provision of two spring arms secures the spring element against undesired twisting during deflection. The spring element can, for example, be configured to be deflected normal to a knife plane, or, for example, be configured to be deflected in the knife plane (i.e. laterally).

[0034] The quick-change blade device further includes a stiffening element. The stiffening element can be releasably attached to the mounting plate and / or the blade, so that the blade is held between the mounting plate and the stiffening element. The stiffening element supports the blade in the normal direction Z.

[0035] Providing a stiffening element allows the knife to be thinner, simplifying sliding and locking the knife onto the mounting plate. The stiffening element ensures sufficient rigidity of the knife during operation, i.e., for cutting and / or mixing the feed.

[0036] The stiffening element can, for example, be designed with a cranked shape and screwed to the mounting plate and / or the blade. If the mounting plate is formed integrally with the mixing screw, the stiffening element can be screwed directly to the mixing screw or the corresponding area of ​​the screw blade. For this purpose, at least one threaded hole can be provided in the mounting plate, particularly in the blade receiving element, for screwing on the stiffening element. Furthermore, the blade can have at least one threaded hole and / or a through hole for screwing on the stiffening element.

[0037] It is understood that the stiffening element can also be attached to the mounting plate and / or the blade in other ways. For example, one or more bolts can be arranged on the mounting plate and / or the blade, which can be received by corresponding openings in the stiffening element. These bolts can be threaded bolts or have cross-bores, allowing the stiffening element to be releasably secured using nuts and / or locking pins.

[0038] The stiffening element can have at least one guide receptacle that can interact with the blade guide of the mounting plate to determine an angular position of the stiffening element relative to the mounting plate. The at least one guide receptacle of the stiffening element is preferably formed as a cutout, opening, or recess integrally in the stiffening element. In particular, the shape of the guide receptacle is adapted to the shape of the blade guide. If the blade guide is designed as a bolt, for example, the guide receptacle of the stiffening element can be provided in the form of a bore (blind hole or through-bore). If the blade guide is designed as a rib or web, the guide receptacle of the stiffening element can be provided in the form of an elongated hole or a groove.In order to determine the angular position of the stiffening element relative to the mounting plate, the knife guide can be at least partially received by the guide holder of the stiffening element.

[0039] Furthermore, the stiffening element can have a plurality of guide receptacles, wherein the guide receptacles are arranged at different angular positions on (or in) the stiffening element. This plurality of guide receptacles can be assigned to a knife guide of the mounting plate. Depending on which of the guide receptacles engages with the knife guide, the angular position of the stiffening element can be easily adjusted to the angular position of the knife on the mounting plate.

[0040] At least one blade guide of the mounting plate (preferably all blade guides) can protrude from the mounting plate and have a stiffening locking element that secures the stiffening element in a normal direction of the mounting plate when the blade and the stiffening element are releasably fixed to the mounting plate. For example, the stiffening locking element can be opposite the blade locking element. The stiffening locking element can, for example, be designed as a projection that projects beyond a portion of the blade when the stiffening locking element is releasably fixed to the mounting plate. The projection then secures the stiffening element in the normal direction Z of the mounting plate.

[0041] The mounting plate can also comprise a fastening area, in particular a welding edge, which serves to fasten the mounting plate to a flight of a mixing screw. Preferably, the mounting plate is welded to a flight of the mixing screw. Alternatively, the mounting plate can also be screwed, riveted, or attached in another way. Typically, a plurality of blades and, accordingly, a plurality of mounting plates are arranged on a mixing screw.

[0042] According to a further embodiment, the mounting plate is formed integrally with a mixing screw, in particular with a screw flight of the mixing screw. In particular, a screw flight of a mixing screw can have one or more (essentially) flat regions. The mounting plate(s) can be mounted in this (essentially) flat region(s), or a corresponding mounting plate can be formed integrally with this region(s).

[0043] The quick-change knife device can further comprise a tool lever which is used to mount the knife. The tool lever comprises at least one deflection element which is designed to engage with a tensioning element of the spring element of the knife, in particular to engage behind it, in order to deflect the spring element. The tensioning element of the spring element is preferably arranged adjacent to or at the free end of a spring arm of the spring element. If the spring element has a web which connects to at least two spring arms, the tensioning element can be arranged on the web. In particular, the spring element can have a plurality of tensioning elements which can be engaged behind by corresponding deflection elements of the tool lever. For example, the tensioning elements can project beyond the spring arms in a lateral extension of the web.

[0044] The tool lever simplifies the deflection of the spring element so that the complementary locking element can be easily guided over the locking element when the knife is pushed onto the knife receiving element in the assembly direction A with the complementary receiving element.

[0045] In addition, the tool lever can comprise at least one tool lever guide, which serves as a support when the spring element is deflected (normal to the blade plane or in the blade plane). The tool lever guide can advantageously be inserted into a corresponding recess / recess in the blade to prevent the tool lever from slipping when the spring element is deflected.

[0046] The tool lever can also include a locking pawl that is movably arranged on the tool lever. This locking pawl can be moved into a locking position. In the locking position, the spring element is fixed in the deflected position by the locking pawl if the spring element was previously deflected by the deflection element of the tool lever. This makes it easy to prepare the knife for being pushed on by first deflecting the spring element and then fixing it in the deflected position. This simplifies sliding the knife onto the mounting plate. Once the knife has been successfully pushed on, the mounting lever or the locking pawl can be released so that the spring element returns to its original position and the knife is locked to the mounting plate. The tool lever can then be removed.

[0047] The knife, which is designed for use in the previously described quick-change knife device, comprises a cutting edge and is designed to be releasably fixed to the mounting plate of the quick-change knife device.

[0048] The mounting plate, which is designed for use in the previously described quick-change blade device, comprises a fastening area, in particular a welding edge, which serves to fasten the mounting plate to a helix of a mixing screw.

[0049] According to a further embodiment, the mounting plate is formed integrally with a mixing screw, in particular with a screw flight of the mixing screw. In particular, a screw flight of a mixing screw can have one or more (essentially) flat regions. The mounting plate(s) can be mounted in this (essentially) flat region(s), or a corresponding mounting plate can be formed integrally with this region(s).

[0050] Furthermore, the object is at least partially achieved by a mixing auger for a feed mixer wagon, wherein the mixing auger comprises a gear that can engage with a drive in order to drive a mixing auger in rotation about an axis. The mixing auger further has at least one helix (screw blade) that is arranged at least partially radially around this axis. The helix carries at least one mounting plate of a previously described quick-change blade device. In particular, the helix can carry at least four mounting plates, preferably at least five mounting plates, particularly preferably at least six to ten mounting plates. These mounting plates can be arranged radially distributed on the helix of the mixing auger. The mounting plates can be attached to the helix and / or formed integrally therewith.

[0051] In particular, a flight of the mixing screw may have one or more (essentially) flat regions. The mounting plate(s) may be mounted in this (essentially) flat region(s), or a corresponding mounting plate may be integrally formed with this region(s).

[0052] In one embodiment, the mixing auger can have at least one canted auger flight. This canted auger flight has regions of varying pitch. (Substantially) flat regions alternate with regions of higher pitch in this mixing auger. Steep regions can be inserted between a (substantially) flat region and a region of higher pitch. These steep regions compensate for the reduced pitch of the (substantially) flat regions. Furthermore, the object is at least partially achieved by a feed mixer wagon. This feed mixer wagon comprises a chassis and a feed mixer wagon container, wherein the feed mixer wagon container is arranged on the chassis. The feed mixer wagon further comprises at least one mixing auger, which has at least one quick-change blade device as described below. This mixing auger is rotatably arranged in the feed mixer wagon container in order to be able to mix feed.The (rotational) axis of the at least one mixing auger is preferably vertically oriented. The feed mixer can be a towed feed mixer or a self-propelled feed mixer.

[0053] Furthermore, the object is at least partially achieved by a method for releasably securing a knife to a mixing auger. This path is preferably a mixing auger of a feed mixer wagon. The method comprises the following steps: a) Providing a mixing screw comprising at least one mounting plate and at least one knife suitable for use in a previously described quick-change knife device. b) Sliding the knife with the complementary receiving element in a mounting direction A onto the knife receiving element of the mounting plate until the complementary receiving element abuts the knife receiving element. c) Locking the locking element with the complementary locking element to block movement of the knife counter to the mounting direction A after the complementary receiving element abuts the knife receiving element.

[0054] The process also achieves the advantages described above. Short description of the characters

[0055] The attached figures show preferred embodiments of the invention. The attached figures are briefly explained below. Fig. 1 is a schematic exploded view of a quick-change blade device according to the invention; Fig. 2 is a schematic representation of a mounting plate; Fig. 3 is a schematic representation of a blade; Fig. 4 is a schematic representation of a stiffening element; Fig. 5 is a schematic representation of a mounting plate which is attached to a spiral of a mixing screw; Fig. 6 is the mounting plate of Fig. 2 , with locked knife; Fig. 7 the mounting plate made of Fig. 2 with locked knife in different angle positions; Fig. 8 the mounting plate and the knife from the Fig. 2 and 3with attached stiffening element; Fig. 9 a schematic representation of a tool lever; Figs. 10A-H the quick-change knife device during the releasable fixing of a knife in different process steps; Fig. 11A a schematic representation of another quick-change knife device according to the invention; Fig. 11B a schematic representation of the quick-change knife device from Fig. 11A , with locked knife; Fig. 12 a schematic representation of a mixing auger, Fig. 13 a schematic representation of another mixing auger, and Fig. 14 a schematic representation of a towed feed mixer wagon. Detailed description of the characters

[0056] Fig. 1 shows a schematic exploded view of a quick-change knife device 10 according to the invention for a mixing screw 20 (see Fig. 12 and 13 ) of a feed mixer wagon 1 (see Fig. 14). The quick-change knife device 10 comprises a mounting plate 300, a knife 100, and a stiffening element 500. The knife 100 can be releasably fixed to the mounting plate 300 and supported in the normal direction Z by the attached stiffening element 500. For this purpose, the knife 100 is held between the mounting plate 300 and the stiffening element 500.

[0057] To fix the knife 100, the mounting plate 300 has at least one knife receiving element 360 and at least one locking element 380. The knife 100 correspondingly has at least one complementary receiving element 160 and at least one complementary locking element 189. To fix the knife 100 to the mounting plate 300, the knife 100 with the complementary receiving element 160 is pushed onto the knife receiving element 360 in the mounting direction A until the complementary receiving element 160 abuts the knife receiving element 360. The contour of the complementary receiving element 160 is preferably adapted to the contour of the knife receiving element 360. In the embodiment shown, the knife receiving element 360 is essentially bolt-shaped. The complementary receiving element 160 is designed as a U-shaped recess in the edge contour of the knife 100 and adapted to the bolt shape of the knife receiving element 360.

[0058] When the complementary receiving element 160 abuts the knife receiving element 360, i.e., the knife 100 is fully pushed on, the locking element 380, which is designed here as a projection, can lock with the complementary locking element 189 of the knife 100, so that a movement of the knife 100 counter to the mounting direction A is blocked. In the embodiment shown, the complementary locking element 189 is arranged centrally on a web 186 of the spring element 180.

[0059] The illustrated knife 100 also has a plurality of guide receptacles 140, wherein the guide receptacles 140 are arranged at different angular positions on the knife. The guide receptacles 140 are formed here as elongated holes in the knife 100. The mounting plate 300 comprises two knife guides 342, 344, which can interact with the guide receptacles 140 to determine an angular position of the knife 100 relative to the mounting plate 300 (see Fig. 7 ).

[0060] The knife guides 342, 344 protrude from the mounting plate 300. For example, the knife guides 342, 344 are welded to the mounting plate 300. The knife guides can also be formed by forming. For this purpose, a contour of the knife guide 342, 344 can be incorporated into the mounting plate 300 (e.g., by milling, water jet cutting, laser cutting, or the like). The part thus formed in the mounting plate is then bent so that the knife guide(s) protrude from the mounting plate 300.

[0061] The stiffening element 500 has corresponding guide receptacles 540, which in the illustrated embodiment are also designed as elongated holes. These guide receptacles 540 can interact with the blade guides 342, 344 of the mounting plate 300 to determine an angular position of the stiffening element 500 relative to the mounting plate 300. The stiffening element 500 also has bores 512, 522 through which fastening elements (e.g., screws 510, 520) can be passed to fix the stiffening element 500 to the blade 100 and / or the mounting plate 300.

[0062] Fig. 2 shows the mounting plate 300 from Fig. 1in a bottom view. The mounting plate 300 has a fastening area 320, which is designed here as a welding edge. With this welding edge, the mounting plate 300 can be welded to a helix 26 of a mixing screw 20. Alternatively or additionally, welding points can be distributed over the mounting plate 300 in order to attach it to the helix. It is also possible for the mounting plate to be (additionally) screwed and / or riveted. Furthermore, the mounting plate 300 has a blade receiving element 360. The blade 100 with the complementary receiving element 160 is pushed onto this blade receiving element 360 until it stops.

[0063] The blade receiving element 360 is in the form of a cylindrical bolt that is welded, screwed, or otherwise fastened to the mounting plate 300. On the side facing away from the mounting plate 300, the blade receiving element 360 has a collar 362. This collar 362 is circumferential here, but can be interrupted at one or more points. The collar 362 forms an undercut 364 into which the complementary receiving element 160 of the blade 100 can engage. The collar 362 then secures the blade in the normal direction Z of the mounting plate 300.

[0064] A threaded bore 312 can be arranged in the knife receiving element 360, which serves to screw on a stiffening element 500.

[0065] The mounting plate 300 also has a locking element 380, which is designed here as a projection. The locking element 380 can, in particular, be embossed into the mounting plate 300. In other embodiments, the locking element 380 can be welded, screwed, or attached in some other way. It is also possible for the locking element 380 to be provided by bending a part of the mounting plate 300. The locking element 380 shown has a sliding surface 382 and a locking surface 384. To releasably fix the knife 100, the complementary locking element 189 slides over the sliding surface 382 before positively locking with the locking surface 384.

[0066] The mounting plate 300 further comprises a first knife guide 342 and a second knife guide 344. The first and second knife guides 342, 344 each protrude from the mounting plate and can, for example, be welded, screwed, or otherwise fastened. Likewise, the knife guides 342, 344 can be produced by bending a part of the mounting plate. The first knife guide 342 and the second knife guide 344 each comprise a knife locking element 343, 347. The knife locking elements 343, 347 are each formed as a projection that extends substantially counter to the mounting direction A. The knife 100 can be inserted beneath these projections in the mounting direction A and thus fixed in the normal direction Z of the mounting plate 300.

[0067] In addition, the first blade guide 342 and the second blade guide 344 each have a reinforcing locking element 345, 348. The reinforcing locking elements 345, 348 are each designed as a projection that extends substantially in the mounting direction A. The reinforcing element 500 can be inserted under these projections counter to the mounting direction A and thus fixed in the normal direction Z of the mounting plate 300.

[0068] Fig. 3 the knife shows 100 Fig. 1 in detail. On a first side, the knife 100 has a cutting edge 102, which is designed here as a serrated edge. Other cutting edge shapes, such as straight edges or double-sided ground edges, are also possible.

[0069] The complementary receiving element 160 is arranged on a side opposite the cutting edge 102. As shown, the complementary receiving element 160 is arranged as a U-shaped recess in the contour of the knife 100.

[0070] The illustrated blade 100 also has a bore 122. This bore 122 serves to attach a stiffening element 500 to the blade 100. In the illustrated embodiment, the blade 100 also has a plurality (here: six) of elongated holes that serve as guide receptacles 140a-f for the blade guides 342, 344 of the mounting plate.

[0071] Furthermore, a spring element 180 is formed integrally with the blade 100. This was produced, for example, by milling, water jet cutting, or laser cutting. The spring element 180 comprises two spring arms 182, 184. The spring arms have an angled shape and are connected to the blade 100 at a first end (fixed end). At the opposite second end, the spring arms 182, 184 are connected to one another via a web 186. The spring arms 182, 184, or the web 186, are shown in their rest position. Clamping elements 187, 188 are arranged laterally on the web 186, which are actuated by corresponding deflection elements 982, 984 of a tool lever 900 (see Fig. 9 ) can be engaged behind in order to deflect the spring element 180 from the rest position into a pre-tensioned position.

[0072] This tool lever 900, with its tool lever guides 922, 924, can be attached to complementary tool lever guides 190, 192. These complementary tool lever guides 190, 192 are arranged as recesses or openings in the blade 100 and serve as abutments for the tool lever 900. They also secure the tool lever 900 against unintentional slipping.

[0073] The complementary locking element 189 is arranged centrally on the web 186 and can lock with the locking element 380, in particular the locking surface 384, in order to secure the knife 100 in a direction opposite to the mounting direction A.

[0074] Furthermore, a complementary locking surface 159 is arranged on the knife 100. The tool lever 900 can be supported on this with a locking blade 910 (see Fig. 10C ).

[0075] Fig. 4 shows the stiffening element 500 from Fig. 1in detail. The stiffening element 500 has a plurality of (here: six) elongated holes that serve as guide receptacles 540a-f for the blade guides 342, 344 of the mounting plate. A first bore 512 and a second bore 522 of the stiffening element 500 serve to fasten the stiffening element 500 to the blade 100 and / or the mounting plate 300, in particular by means of screws 510, 520. The contour of the stiffening element 500 is substantially adapted to the contour of the blade 100, such that the stiffening element 500 supports the blade 100 in the normal direction Z when the blade 100 and the stiffening element 500 are fixed to the mounting plate 300. The size of the stiffening element 500 is adapted to the size of the knife so that the cutting edge 102 of the knife 100 remains free.

[0076] Fig. 5shows a schematic representation of a mounting plate 300, which is attached to a helix 26 (also referred to as the screw flight) of a mixing screw 20. The helix 26 or the mixing screw 20 is only shown in detail. The mounting plate 300 is welded to the fastening area 320 (here a welding area) on the helix 26. Alternatively, the mounting plate can also be screwed, riveted, or connected to the helix 26 in some other way. In particular, the mounting plate 300 can also be formed integrally with the helix 26. The mounting plate 300 is oriented such that the knife receiving element 360 is arranged closer to the center of the mixing screw 20 in the radial direction R (which corresponds in this case to the mounting direction A) than the knife guides 342, 344. The locking element 380 is arranged between the knife receiving element 360 and the knife guides 342, 344.

[0077] Fig. 6 shows the mounting plate 300 from Fig. 5, wherein a knife 100 is releasably fixed to the mounting plate 300. The complementary receiving element 160 abuts the knife receiving element 360 in the configuration shown. Thus, the knife 100 is secured in the mounting direction A. The collar 362 of the knife receiving element 360 forms an undercut into which the complementary receiving element 160 of the knife 100 engages and is thus secured in the normal direction Z. In addition, the locking element 380 is locked with the complementary locking element, which is arranged on the spring element 180. Thus, the knife is also secured against the mounting direction A. The knife guides 342, 344 of the mounting plate 300 engage in the guide receptacles 140b and 140e accordingly. This determines the angular position of the knife 100 relative to the mounting plate 300.In addition, the knife locking elements 343, 347 in the embodiment shown are each designed as a projection that extends substantially opposite to the mounting direction A. The knife 100 is inserted under these projections and thus additionally fixed in the normal direction Z of the mounting plate 300.

[0078] Fig. 7 shows the mounting plate 300 with the locked knife 100 in different angular positions (see dashed lines). In order to fix or secure the knife 100 in different angular positions, the knife guides 342, 344 of the mounting plate 300 are inserted into different guide receptacles 140 or engage in them. A first angular position can be achieved when the knife guides 342, 344 engage in the corresponding guide receptacles 140a, 140d. A second angular position can be achieved when the knife guides 342, 344 engage in the corresponding guide receptacles 140b, 140e (as in Fig. 6, shown) and a third angular position can be achieved when the knife guides 342, 344 engage in the corresponding guide receptacles 140c, 140f, as in Fig. 7 shown (solid lines). The angular position of the first, second, and third angular positions is determined by the arrangement of the guide receptacles 140 af. For example, the first and second angular positions can enclose an angle of 5°, 8.5°, 10°, 15°, or 20°. Likewise, the second and third angular positions can enclose an angle of 5°, 8.5°, 10°, 15°, or 20°. If the first and second angular positions, as well as the second and third angular positions, enclose an angle of 8.5°, the knife 100 can, for example, be fixed or secured in the first angular position (0°), in the second angular position (8.5°), and in the third angular position (17°).

[0079] Fig. 8shows the mounting plate 300 and the blade 100 with the attached stiffening element 500. The stiffening element 500 is arranged in a third angular position, which corresponds to the angular position of the blade 100. Accordingly, the blade guides 342, 344 of the mounting plate 300 engage in guide receptacles 540c, 540f of the stiffening element 500. As shown, the stiffening locking elements 345, 348 in the illustrated embodiment are each designed as a projection that extends substantially in the mounting direction A. The stiffening element 500 is inserted beneath these projections and thus additionally fixed in the normal direction Z of the mounting plate 300. Furthermore, the stiffening element is fastened to the mounting plate 300 and / or the blade 100 by means of the screws 512, 522.

[0080] Fig. 9is a schematic representation of a tool lever 900. This tool lever is used for assembling or replacing a blade 100 of the quick-change blade device 10. The tool lever 900 comprises a carrying handle 906. This serves, among other things, for carrying and transporting the tool lever 900. The tool lever 900 also comprises a handle 904, with which the tool lever is preferably operated. To protect the mechanic when changing / assembling the blade, a finger guard 902 is arranged on the handle 904. This finger guard partially covers the cutting edge 102 of the blade 100 when the assembly lever 900 is applied to the blade 100.

[0081] The tool lever 900 serves to pretension or deflect the spring element 180 of the knife 100. On the side facing away from the handle 904, an actuating element 920 is arranged (welded or otherwise connected) on the tool lever 900. The actuating element 920 can also be formed integrally with the tool lever 900. Two deflection elements 982, 984 are arranged on the actuating element 920, which are designed to engage behind tensioning elements 187, 188 of the spring element 180 in order to deflect the spring element 180 from its rest position. A first and a second tool lever guide 922, 924 are arranged between the handle 904 and the deflection elements 982, 984, which serve as abutments when the spring element 180 is deflected.The tool lever guides 922, 924 can be inserted into corresponding recesses / recesses (complementary tool lever guides 190, 192) of the knife 100 in order to prevent the tool lever 900 from slipping when the spring element 180 is deflected.

[0082] The tool lever 900 further comprises a locking pawl 910, which is movably arranged on the tool lever 900. The locking pawl 910 comprises a first pawl section 912 and a second pawl section 914. Between these sections 912, 914, an axis 913 is arranged, about which the locking pawl 910 can be pivoted relative to the tool lever 900. The first pawl section 912 also comprises a locking surface 919, which can engage with a complementary locking surface 159 of the knife 100. The second pawl section 914 serves to move the locking pawl into a locking position. In the locking position, the spring element 180 is fixed in the deflected position if it was previously deflected by the deflection element(s) 982, 984 of the tool lever 900.

[0083] The Figures 10A-Hschematically show method steps for releasably fixing a knife 100 to a mounting plate 300. The knives 100, mounting plates 300, stiffening elements 500 and tool levers 900 shown in these figures essentially correspond to the previously described knives, mounting plates, stiffening elements and tool levers, so that unnecessary repetitions are omitted below.

[0084] In Fig. 10A The knife 100 and the tool lever 900 are shown. In a first step (see Fig. 10B), the tool lever 900 is applied to the blade 100. The deflection elements 982, 984 engage behind the clamping elements 187, 188 of the spring element 180. In addition, the tool lever guides 922, 924 are inserted into corresponding recesses / recesses (complementary tool lever guides 190, 192) of the blade 100 to prevent the tool lever 900 from slipping during the subsequent deflection of the spring element 180. The locking pawl 910 is still in its initial position. By actuating the tool lever 900 in the direction of the arrow, the spring element 180 can now be easily deflected.

[0085] In Fig. 10CThe spring element 180 is deflected. The spring element 180 is deflected by means of the deflection elements 982, 984, which engage behind the clamping elements 187, 188 of the spring element 180. The locking pawl 910 is also moved into the locking position. The locking surface 919 of the first pawl section 912 engages the complementary locking surface 159 of the knife 100 and thus fixes the spring element 180 in the deflected position.

[0086] In this deflected position, the knife 100 can simply be pushed onto the mounting plate 300, as shown in Fig. 10D shown. The finger guard 902 of the tool lever 900 partially covers the cutting edge 102 of the knife, thus reducing the risk of injury.

[0087] The Figures 10E and 10Fshow the sliding of the knife 100 in the assembly direction A. Specifically, the knife 100 with the complementary receiving element 160 is pushed in the assembly direction A onto the knife receiving element 360 of the mounting plate 300 (see Fig. 10E ) until the complementary receiving element 160 abuts the blade receiving element 360. Thus, the blade is fixed in the mounting direction A. During sliding on, the locking pawl 910 is in the locking position, so that the spring element 180 remains deflected. This simplifies the guiding of the complementary locking element 189 over the locking element 380 of the mounting plate 300.

[0088] In the Fig. 10GIn the position shown, the locking pawl 910 is moved out of the locking position and the spring element 180 can return to the rest position, so that the complementary locking element 189 of the knife is locked with the locking element 380 of the mounting plate 300. Thus, the knife 100 is fixed in and against the mounting direction A. The fixation in the normal direction Z is achieved by means of the collar 362 of the knife receiving element 360 and / or by means of the knife locking elements 343, 347 of the knife guides 342, 344 as described above. The tool lever 900 can now be removed (see Fig. 10H ). To support the blade 100 in the normal direction Z, a stiffening element 500 can be mounted as shown in Fig. 8 shown.

[0089] The Fig. 11A and 11B show a schematic representation of another quick-change knife device 10" according to the invention. In Fig. 11Athe knife 100" is not yet fixed to the mounting plate 300", which is here formed integrally with the mixing screw or a corresponding spiral 26". In Fig. 11B , the knife was moved 100" in assembly direction A and finally fixed. In contrast to the Fig. 10A to 10G the knife 100" is not moved radially, but essentially in a circumferential direction of the mixing screw (ie essentially tangential, opposite to a direction of rotation of the mixing screw).

[0090] The integrally designed mounting plate 300" has a blade receiving element 360", which in the present case is designed in the form of a cylindrical bolt. This can, for example, be welded, screwed or otherwise fastened to the mounting plate 300". On the side facing away from the mounting plate 300", the blade receiving element 360" has a collar. This collar is, as in the Fig. 2In the embodiment shown, it is formed circumferentially, but can be interrupted at one or more points. The collar forms an undercut into which the complementary receiving element 160" of the blade 100" can engage. The collar then secures the blade in the normal direction of the mounting plate 300".

[0091] In this example, the complementary receiving element 160" of the knife 100" is formed as an inner contour of the knife 100", in particular as a narrow part of a keyhole-shaped inner contour of the knife. The inner contour is formed by a corresponding opening in the knife 100".

[0092] The mounting plate 300" also has a locking element, which here is formed integrally with the blade receiving element 360". In particular, in the embodiment shown, the locking element is a locking surface on the blade receiving element, ie, the outer surface of the cylindrical bolt 360".

[0093] The mounting plate 300" further includes a knife guide 342". The knife guide 342" protrudes from the mounting plate 300" and can, for example, be welded, screwed, or otherwise fastened. Likewise, the knife guide 342" can be produced by bending a portion of the mounting plate. The knife guide 342" includes a knife locking element 343". This knife locking element 343" is designed here as a projection that extends substantially opposite to the mounting direction A. The knife 100" can be inserted under this projection in the mounting direction A and thus fixed in the normal direction Z of the mounting plate 300".

[0094] The blade 100" has a bore 122". This bore 122" serves to attach a stiffening element 500 to the blade 100". This can be done as described in detail above. In particular, a stiffening locking element 345" can also be provided on the blade guide 342", for example in the form of a projection.

[0095] Furthermore, a spring element 180" is formed integrally with the blade 100". This was produced, for example, by milling, water jet cutting, or laser cutting. The spring element 180" is designed here in the form of a spring arm. The spring arm is connected to the blade 100" at its first end (fixed end). At the opposite second end, the complementary locking element 189" is arranged, which can lock with the locking element, in particular the locking surface (lateral surface of the bolt), in order to secure the blade 100" in a direction opposite to the assembly direction A. In the embodiment shown here, the spring element 180" can be deflected in the blade plane (i.e. laterally) in order to slide the blade 100" onto the blade receiving element 360". Once the blade 100" has been pushed on, the spring element 180" can spring back to lock the blade 100".

[0096] In order to fix or secure the knife 100" in different angular positions, the knife guide 342" of the mounting plate 300" can be inserted into different guide receptacles 140a", 140b", 140c". A first angular position can be achieved when the knife guide 342" engages in the corresponding guide receptacle 140a". A second angular position can be achieved when the knife guide 342" engages in the corresponding guide receptacle 140b" (as in Fig. 11B , shown) and a third angular position can be achieved when the knife guide 342" engages the corresponding guide receptacle 140c". The arrangement of the guide receptacles 140a", 140b" and 140c" determines the angular position of the first, second and third angular positions, as described above.

[0097] Fig. 12is a schematic representation of a mixing auger 20 for a feed mixer wagon 1. The mixing auger 20 comprises a gear 22 that can engage with a drive (not shown) to drive the mixing auger 20 in rotation about an axis 24. The mixing auger comprises at least one helix 26 that is arranged at least partially radially around the axis 24. The helix 26 carries at least one mounting plate 300 of a quick-change blade device 10. In the embodiment shown, six quick-change blade devices 10 are provided, so that six blades 100 can be arranged on the helix 26 of the mixing auger 20.

[0098] Fig. 13is a partial, schematic representation of another mixing auger 20' for a feed mixer wagon 1. The mixing auger 20' comprises a gear (not shown) that can engage with a drive (also not shown) to drive the mixing auger 20' in rotation about an axis 24. The mixing auger comprises at least one helix 26', which is arranged at least partially radially around the axis 24. The helix 26' is designed here as a folded auger blade. This folded auger blade 26' has regions of different pitches 26a, 26b, 26c. In this mixing auger 20', (essentially) flat regions 26a alternate with regions of higher pitch 20b. Steep regions 26c can be inserted between a (essentially) flat region 26a and a region of higher pitch 26b. These steep areas 26c compensate for the reduced gradient of the (essentially) flat areas 26a.

[0099] Mounting plates are provided in some of the substantially flat areas. Here, the mounting plates are integrally formed with the respective substantially flat areas. Blades 100 are releasably fixed to the integrally formed mounting plates or the corresponding substantially flat areas 26a.

[0100] Fig. 14is a schematic representation of a feed mixer wagon 1. The feed mixer wagon shown is a towed feed mixer wagon that can be attached to a vehicle (not shown), for example a tractor. The invention is not limited to towed feed mixer wagons, but also relates to powered and (self-)propelled feed mixer wagons. The feed mixer wagon 1 comprises a chassis 30 and a feed mixer wagon hopper 40, wherein the feed mixer wagon hopper 40 is arranged on the chassis 30. At least one mixing auger (here two), comprising a quick-change blade device, is arranged in the feed mixer wagon hopper. The at least one mixing auger can rotate about the axis 24, 24' in order to mix feed in the feed mixer wagon hopper 40. List of reference symbols

[0101] 1 Feed mixer wagon 10 Quick-change blade device 20 Mixing auger 22 Gearbox 24, 24' Axle 26, 26' Helix (auger blade) 26a (essentially) flat area 26b Area of ​​higher gradient 26c Steep area 30 Chassis 40 Feed mixer hopper 100 Blade 102 Cutting edge 122 Bore 140a-f Guide mounts 159 Complementary locking surface 160 Complementary mount element 180 Spring element 182 Spring arm 184 Spring arm 186 Web 187 Clamping element 188 Clamping element 189 Complementary locking element 190 Complementary tool lever guide 192 Complementary tool lever guide 300 Mounting plate 312 Threaded hole 320 Fastening area 342 First knife guide 343 Knife locking element 344 Second knife guide 345 Reinforcing locking element 347 Knife locking element 348 Reinforcing locking element 360 Knife holder element 362 Collar 364 Undercut 380 Locking element 382 Sliding surface 384 Locking surface 500 Reinforcing element 540a-f Guide holders 510 First fastening element 512 Bore 520 Second fastening element522Bore 900Tool lever 902Finger guard 904Handle 906Carrying handle 910Pawl 912First pawl section 913Shaft 914Second pawl section 919Locking surface 920Actuating element 922First tool lever guide 924Second tool lever guide 982First deflection element 984Second deflection element AMembly direction Rradial direction ZNormal direction

Claims

1. Blade quick-change device (10) for a mixing auger (20) of a feed mixer (1), comprising a blade (100), a mounting plate (300) and a stiffening element (500), wherein the blade (100) can be releasably fixed to the mounting plate (300); wherein the mounting plate (300) has at least one blade-receiving element (360) and at least one locking element (380) and the blade (100) has at least one complementary receiving element (160) and at least one complementary locking element (189), wherein the blade (100) and the mounting plate (300) are arranged for releasably fixing the blade (100) to the mounting plate (300) in such a way that the blade (100) with the complementary receiving element (160) can be pushed onto the knife-receiving element (360) in an assembly direction (A), so that the complementary receiving element (160) abuts against the knife-receiving element (360), and that the locking element (380) can lock with the complementary locking element (189) so that a movement of the blade counter to the mounting direction (A) is blocked when the complementary receiving element (160) abuts against the blade-receiving element (360), characterized in that the stiffening element (500) can be releasably fixed to the mounting plate (300) and / or the blade (100) so that the blade (100) is held between the mounting plate (300) and the stiffening element (500), wherein the stiffening element (500) supports the blade (100) in the normal direction Z.

2. Blade quick-change device (10) according to Claim 1, wherein the blade (100) additionally has at least one guide receptacle (140a-f) and the mounting plate (300) has at least one blade guide (342, 344), wherein the guide receptacle (140a-f) cooperates with the blade guide (342, 344) so that an angular position of the blade (100) relative to the mounting plate (300) is determined when the blade (100) is releasably fixed to the mounting plate (300).

3. Blade quick-change device (10) according to Claim 2, wherein the blade (100) has a plurality of guide receptacles (140a-f), wherein the guide receptacles (140a-f) are arranged in different angular positions on the blade.

4. Blade quick-change device (10) according to one of Claims 2 and 3, wherein the at least one blade guide (342, 344) protrudes from the mounting plate (300) and has a blade latching element (343, 347) which secures the blade (100) in a normal direction Z of the mounting plate when the blade (100) is releasably fixed to the mounting plate (300).

5. Blade quick-change device (10) according to one of the preceding claims, wherein the at least one blade-receiving element (360) has a collar (362) which in any case at least partially projects beyond the complementary receiving element (160) of the blade when the blade (100) is releasably fixed to the mounting plate (300), and which secures the blade in a normal direction Z of the mounting plate.

6. Blade quick-change device (10) according to one of the preceding claims, wherein the blade (100) comprises a spring element (180) which can be formed integrally with the blade (100), and wherein the spring element (180) has the complementary locking element (189).

7. Blade quick-change device (10) according to Claim 1, wherein the stiffening element (500) has at least one guide receptacle (540a-f) which can cooperate with the blade guide (342, 344) of the mounting plate (300) in order to determine an angular position of the stiffening element (500) relative to the mounting plate (300), and wherein the at least one blade guide (342, 344) optionally has a stiffening latching element (345, 348) which secures the stiffening element (500) in a normal direction Z of the mounting plate when the stiffening element (100) is releasably fixed to the mounting plate (300).

8. Blade quick-change device (10) according to one of the preceding claims, wherein the mounting plate (300) comprises a fastening area (320), in particular a welding edge, which serves to fasten the mounting plate to a helix (26) of a mixing auger (20), or wherein the mounting plate (300) is formed integrally with a mixing auger (20, 20'), in particular a helix (26) of the mixing auger (20, 20').

9. Blade quick-change device (10) according to one of Claims 6 to 8, further comprising a tool lever (900), wherein the tool lever (900) comprises at least one deflection element (982, 984) which is configured to engage with a tensioning element (187, 188) of the spring element (180) in order to deflect the spring element (180) so that the complementary locking element (189) can be guided over the locking element (380) when the blade (100) is pushed onto the blade-receiving element (360) in the assembly direction (A) with the complementary receiving element (160).

10. Blade quick-change device (10) according to the preceding claim, wherein the tool lever (900) comprises a locking pawl (910) which is movably arranged on the tool lever (900) and can be moved into a locking position, wherein in the locking position the locking pawl (910) fixes the spring element (180) in the deflected position when the latter has been deflected by the deflection element (982, 984) of the tool lever (900).

11. Mixing auger (20) for a feed mixer (1), wherein the mixing auger (20) comprises a gear (22) which can engage with a drive in order to drive the mixing auger (20) rotating about an axis (24), and wherein the mixing auger (20) further comprises at least one helix (26) which is arranged at least partially radially about the axis (24), wherein the at least one helix (26) carries at least one mounting plate (300) of a blade quick-change device (10) according to one of Claims 1 to 10, or wherein at least one mounting plate (300) of a blade quick-change device (10) according to one of Claims 1 to 10 is formed integrally with the at least one helix (26).

12. Feed mixer (1) comprising a chassis (30) and a feed mixer container (40), wherein the feed mixer container (40) is arranged on the chassis (30), the feed mixer further comprising at least one mixing auger (20) according to Claim 11, which is arranged in the feed mixer container (40) in order to mix feed.

13. Method for releasably fixing a blade (100) to a mixing auger (20), preferably a mixing auger (20) of a feed mixer (1), wherein the method comprises the following steps: Providing a mixing auger (20) according to Claim 11, and at least one blade (100) of a blade quick-change device (10) according to one of Claims 1 to 10, wherein the blade (100) comprises a cutting edge (102) and is designed to be releasably fixed to a mounting plate (300) of the blade quick-change device; Sliding the blade (100) with the complementary receiving element (160) in an assembly direction (A) onto the blade-receiving element (360) until the complementary receiving element (160) abuts against the blade-receiving element (360); Locking the locking element (380) with the complementary locking element (189) in order to block a movement of the blade (100) counter to the mounting direction (A) after the complementary receiving element (160) abuts against the blade-receiving element (360).