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EP3137271B1 - Contre-lame - Google Patents

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Publication number
EP3137271B1
EP3137271B1 EP14838783.0A EP14838783A EP3137271B1 EP 3137271 B1 EP3137271 B1 EP 3137271B1 EP 14838783 A EP14838783 A EP 14838783A EP 3137271 B1 EP3137271 B1 EP 3137271B1
Authority
EP
European Patent Office
Prior art keywords
hard material
counter
cutting edge
blade
elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14838783.0A
Other languages
German (de)
English (en)
Other versions
EP3137271A1 (fr
Inventor
Markus Roth
Claus-Daniel ARMBRUSTER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Betek GmbH and Co KG
Original Assignee
Betek GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Betek GmbH and Co KG filed Critical Betek GmbH and Co KG
Publication of EP3137271A1 publication Critical patent/EP3137271A1/fr
Application granted granted Critical
Publication of EP3137271B1 publication Critical patent/EP3137271B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16—Details
    • B02C18/18—Knives; Mountings thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16—Details
    • B02C18/18—Knives; Mountings thereof
    • B02C18/186—Axially elongated knives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B27L11/005—Tools therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16—Details
    • B02C18/18—Knives; Mountings thereof
    • B02C2018/188—Stationary counter-knives; Mountings thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2210/00—Codes relating to different types of disintegrating devices
    • B02C2210/02—Features for generally used wear parts on beaters, knives, rollers, anvils, linings and the like

Definitions

  • the invention relates to a counter-blade, in particular for a wood chipper, for producing wood chips, with at least one cutting edge made of a hard material and a support surface leading to the cutting edge.
  • Such a counter blade is from the US6094795A known.
  • shredding units are used in which rotating knives are guided past a fixed counter-blade and the material is shredded between the rotating knives and the counter-blade.
  • the shredding unit consists of a slow-running, cylindrical rotor to which the blades are attached, and a bar-like counter blade arranged parallel to the rotor. The material to be shredded is fed to the shredding unit via a feed unit.
  • AT 398 509 B describes a cutting bar for use in a shredder, the cutting edge of which is formed by two cutting surfaces (side surface and surface) that are approximately at right angles to one another. The side surface up to the cutting edge is coated with a hard metal. A hard metal coating is also provided on the surface, at a distance from the cutting edge.
  • the hard metal coating can significantly increase the service life of the counter cutting edge.
  • the gap between the cutting edge and the coating on the surface creates a self-sharpening effect, as the softer material in between wears more quickly, while the cutting edge made of hard metal remains intact.
  • the object of the invention is solved by a counter blade according to claim 1.
  • the hard material elements can preferably be made of hard metal. Such hard material elements show very little wear, which means that the service life of such a counter-blade is significantly longer than that of a conventional counter-blade made of steel.
  • the formation of the cutting edge from a large number of hard material elements arranged next to one another offers the advantage that if a hard material element breaks, it does not spread into an adjacent hard material element. The damage is thus limited locally, so that the counter-blade can continue to be used.
  • a counter-blade edge segmented in this way a stress-optimized design can be achieved in favor of a low risk of breakage.
  • the hard material elements are attached to the base body in short sections, so that, for example, tolerance-related fastening irregularities have only a small influence on the component stresses introduced via the fastening. Since the hard material elements are attached to a base body, this can be easily and quickly installed together with the attached hard material elements in one operation during assembly or if replacement is required.
  • the use of small hard material elements offers the further advantage that they can be manufactured inexpensively and in large quantities. This means that the overall costs for a hard-tipped counter blade can be kept low.
  • hard metal is suitable as a material for the hard material elements.
  • Hard metals with a cobalt content of between 3.0 and 25 percent by weight are particularly suitable.
  • a part of the hard material elements is arranged along an edge of the base body and that the cutting edge is formed by the hard material elements of base bodies arranged next to one another.
  • a long counter-blade can thus be formed by lining up several base bodies equipped with hard material elements.
  • uniform base bodies can be used in kit form to produce counter-blades of different lengths.
  • the use of smaller, uniform base bodies offers the advantage that they can be manufactured cost-effectively in smaller production units.
  • a production error for example during soldering, only leads to the rejection of one base body and not an entire counter-blade.
  • the construction of the counter-blade from several base bodies offers the advantage that these can be replaced individually if necessary.
  • the base bodies arranged in particularly heavily loaded sections of the counter-blade and correspondingly worn can be replaced early, while the base bodies in less heavily loaded areas can continue to be used. Damaged base bodies can therefore be replaced individually.
  • a suitable cutting edge with good cutting results can be obtained by making the hard material elements cuboid-shaped or trapezoid-shaped, by making a long edge of the cuboid or trapezoid part of the cutting edge and by arranging the cuboids or trapezoids along their surface delimited by their short edges.
  • the cuboid-shaped hard material elements are can be produced cost-effectively in large quantities and can be easily connected to the base body, for example by brazing. Any number of hard material elements can be arranged flush next to one another.
  • the cuboid shape means that the use of the high-quality hard material can be optimally adapted to the requirements, so that the base body, the hard material elements and other wearing components of the counter cutting edge have approximately the same service life.
  • a secure and durable attachment of the hard material elements to the base body can be achieved by the base body having a recess along the cutting edge into which the hard material elements are set flush with a front face of the base body and/or flush with the support surface, or by the hard material elements being set into the recess in such a way that they protrude beyond the front face and/or the support surface, or by the hard material elements being set into the recess in such a way that they are set back from the support surface.
  • the preferably cuboid-shaped hard material elements are thus each connected to the base body on two of their long sides so that they are not broken out of the composite even under heavy mechanical stress.
  • the hard material elements are flush with the support surface or are set back slightly from the support surface, they are not caught by the material to be cut fed via the support surface under an applied contact pressure and are sheared off from the base body. If the hard material elements are arranged so that they are flush with the front surface of the base body or protrude slightly beyond the front surface of the base body, a free cutting surface is formed. In these arrangements, the support for the hard material elements formed by the recess ends flush or set back from the hard material elements and is accordingly protected from cutting material passing by, which can prevent premature wear of the base body in this area.
  • the support surface on which the material to be cut is fed to the cutting edge is also exposed to strong mechanical stress in the immediate vicinity of the cutting edge.
  • the support surface along the hard material elements forming the cutting edge has a large number of hard material protective elements arranged in a row, which preferably adjoin the hard material elements flush with them or are arranged at a distance from the hard material elements by a gap.
  • the protective elements can be made of abrasion-resistant hard metal, for example. If the protective elements lie directly against the hard material elements, the surface of the base body in this area is completely protected against wear.
  • the base body can prevent the base body from being washed out here, which would lead to a weakening of the support of the hard material elements. As a result of such washing out, there is a risk of premature breakage of the hard material elements.
  • a gap is provided between the hard material elements and the protective elements, the relatively soft material of the base body is exposed here. Due to the increased abrasion in this area, the backs of the hard material elements are slowly exposed during operation, while the hard material elements are worn away more slowly. The hard material elements thus form a free-standing cutting edge. This arrangement can achieve a self-sharpening effect for the cutting edge.
  • the gap area In order to prevent excessive washing out of the base body, the gap area must be dimensioned depending on the strength of the base body.
  • the risk of breakage for the hard material elements and the protective elements can be further reduced by arranging the transitions between the protective elements spatially offset from the transitions between the hard material elements in the direction of extension of the cutting edge.
  • the hard material elements are subject to greater mechanical stress and thus greater wear than the protective elements.
  • the material thickness of the hard material elements is chosen to be greater than the material thickness of the protective elements.
  • the material thickness of the hard material elements and/or the material thickness of the protective elements can be selected differently for different base bodies. In areas of high mechanical stress, base bodies with comparatively thick hard material elements or protective elements can be provided, while in areas with low mechanical stress, base bodies with comparatively thin hard material elements or protective elements can be provided.
  • the material to be cut is guided under high contact pressure over the support surface to the cutting edge.
  • the support surface is formed in direct or indirect connection to the protective elements or the cutting edge by a cover plate attached to each base body. If the cover plate is worn out prematurely compared to the hard material elements or the protective elements, it can be replaced separately and the base body with the high-quality hard material components can continue to be used.
  • the base body can be made of a comparatively soft and tough steel and the cover plate can be made of a comparatively harder steel.
  • the soft and tough steel of the base body retains its properties at the high temperatures required during the soldering process for attaching the hard material elements and the protective elements and ensures that the base body can withstand high tensile and bending loads when the counter blade is used.
  • the comparatively hard cover plate results in the required low wear of the support surface.
  • the base body can be made of 42CrMo4, for example, while the support surface can be made of Hardox 400.
  • the base body can be designed to form a web between the protective elements and the cover plate.
  • the protective elements can be attached to this web during production.
  • the web forms a reservoir for the solder used so that it does not flow away.
  • the cover plate can be placed against the web for later assembly. It is then correctly aligned for attachment to the base body.
  • the base body can form a support plane on the side facing away from the cutting edge, on which the cover plate is held flat.
  • the complete support prevents breakage or deformation of the cover plate, even under heavy mechanical stress.
  • the transition from the web to the support plane is preferably designed as a curve and one edge of the cover plate has a chamfer in the area of the curve. The curve reduces stress peaks in the area of the transition from the web to the support plane. The chamfer ensures that the cover plate is exposed in the area of the curve and thus rests on the support plane over its entire surface.
  • the base body has fastening receptacles for receiving fastening elements for fastening the base body to a support and that the cover plate has holes for receiving mounting screws for fastening the cover plate to the base body, whereby the cover plate covers the fastening receptacles of the base body when assembled.
  • the fastening receptacles of the base body are thus protected from wear by the cover plate.
  • the base bodies are first attached to a support and then the cover plates are mounted on the base body. Disassembly is carried out in the reverse order. Due to contamination, for example due to resinification, it may happen that the cover plate cannot be detached from the base body during disassembly.
  • the cover plate can therefore have a pressing section, preferably a threaded hole.
  • the pressing section can be used to press the cover plate off the base body and thus release it.
  • An easy-to-manufacture design provides a threaded hole penetrating the cover plate. A screw can be screwed into this for disassembly, which presses against the base body underneath and lifts the cover plate off the base body.
  • the base body has a second cutting edge.
  • the second cutting edge can be formed from hard material elements arranged in a row, corresponding to the first cutting edge, preferably from the same hard material elements as are used for the first cutting edge.
  • Counter cutting edges can be formed from these base bodies with two cutting edges, as used in various shredding units.
  • the base body has a positioning receptacle or a positioning projection for receiving a positioning projection or a positioning receptacle arranged on the carrier.
  • the positioning projection engages in the positioning receptacle. This sets and fixes the position of the base body relative to the carrier. This is particularly advantageous when replacing a base body while the shredding unit is in use, since the replacement can be carried out quickly and without errors even under unfavorable conditions, and the assembly times for the unit can thus be kept very short.
  • a simple positioning of the base body relative to the carrier can be achieved by arranging the positioning holder or the positioning projection along a front stop surface of the base body opposite the cutting edge or by arranging the positioning holder or the positioning projection along a mounting plane of the base body opposite the support plane.
  • the base body is placed on the carrier in such a way that the positioning projection engages in the positioning holder so that the base body can be connected to the carrier via the fastening elements.
  • the cover plate has a positioning holder and/or a positioning attachment on its front side facing away from the cutting edge.
  • the positioning attachment then engages in a corresponding positioning recess on the carrier, or a positioning projection provided on the carrier engages in the positioning recess of the cover plate so that it is precisely aligned with the base body.
  • Figure 1 shows a top view of a counter cutting edge 10 with a cutting edge.
  • the cutting edge 14 is formed from a row of cuboid-shaped hard material elements 12 arranged along the cutting edge 14.
  • the protective elements are also made of a hard material.
  • the hard material elements 12 and the protective elements 13 are made of hard metal. Separated by a narrow web 28, cover plates 30 with two mounting screws 34 each are attached to a base body 20 covered by the cover plates 30, the protective elements 13 and the hard material elements 12, as shown in the Figures 2, 3 and 5
  • a cover plate 30 with the protective elements 13 and hard material elements 12 arranged in a row shows the outline of a segment 16 of the counter-blade 10.
  • the counter-blade 10 is formed from eight segments 16 arranged in a row.
  • the segments 16 are attached to a carrier 11.
  • Six hard material elements 12 per segment 16 form a cutting edge section 18 marked by a double arrow, with the cutting edge sections 18 arranged in a row representing the cutting edge 14.
  • the carrier has positioning projections 17. These engage in positioning receptacles 23, 35 introduced into the base body 20 and the cover plate 30, as described in more detail in the Figures 2 and 4 shown, a.
  • a continuous threaded hole 33 is provided in each cover plate 30 between the mounting screws 34.
  • the base bodies 20 are fastened to the carrier 11 in such a way that the cutting edge 14 protrudes beyond the carrier 11.
  • the positioning lugs 17 and the positioning receptacles 23 serve to quickly and precisely align the individual base bodies 20 with respect to the carrier 11.
  • the cover plates 30 are then attached to the base bodies 20.
  • the second positioning receptacle provided on the cover plate 30 serves to easily position the cover plate 30 with respect to the carrier 11 and thus with respect to the already assembled base body 20. Equipped with the segments 16 of the counter blade 10, the carrier 11 can then be mounted, for example, on a wood chipper for producing wood chips in such a way that the cutting edge 14 is opposite knives which are arranged on a rotating roller of the wood chipper and are guided past the counter blade 10.
  • the wood to be shredded is fed to the cutting edge 14 by appropriate conveyor units over the support surface 29.
  • the blades of the wood chipper (not shown) are guided past the cutting edge 14 in the illustration coming from the viewing direction. Wood that protrudes beyond the cutting edge 14 is shredded in the process.
  • the cutting edge 14 is advantageously formed from a large number of hard material elements 12.
  • Hard material elements 12 show little wear, which means that the counter-blade 10 has a long service life. Due to the small size of the individual hard material elements 12, the bending load on the individual hard material elements 12 is low, so that breakages can be largely avoided. Should a hard material element 12 nevertheless break, for example due to a high mechanical load caused by a hard material accidentally introduced into the cutting gap, the breakage is limited to the affected hard material element 12 and does not continue into the adjacent hard material element 12. Due to the structure of the counter-blade 10 from a large number of adjacently arranged hard material elements 12, extensive breakage along the cutting edge 14 made of hard metal can thus be avoided and the counter cutting edge 10 can continue to be used.
  • the affected segment 16 can be replaced individually. To do this, first the cover plate 30 is separated from the base body 20 and then the base body 20 is separated from the carrier 11. If the cover plate 30 cannot be separated from the base body 20, for example due to heavy contamination or resinification, a screw can be screwed into the threaded hole 33 and the cover plate 30 can be pushed away from the base body 20. A new base body 20 can then be mounted on the carrier 11 in the free space and a cover plate 30 attached.
  • the simple centering using the positioning holders 23, 35 and the positioning lugs 17 means that one or more segments 16 can be changed very quickly.
  • the machine can be kept down for maintenance to a minimum.
  • the ability to replace individual segments 16 means that spare parts costs can be kept low.
  • the low level of wear on the hard material elements means that the counter-blade 10 has a consistent cutting performance over a long period of time. This leads to consistent quality of the wood chips.
  • the high cutting performance means that energy consumption is low and the operating costs of the shredding unit are reduced. This is particularly noticeable in mobile use due to reduced fuel consumption, which not only reduces costs but also has a lower environmental impact.
  • the protective elements 13 also protect the front area of the support surface 29 facing the cutting edge 14, which is subject to particularly high mechanical stress, from premature wear.
  • the protective elements 13 By using a large number of protective elements 13 arranged in a row and the lateral offset compared to the hard material elements 12 arranged in front of them, the risk of breakage is also reduced here and the further spread of a break is prevented.
  • Figure 2 shows a perspective front view of a base body 20 of the counter cutting edge 14 with a cutting edge section 18.
  • the base body 20 is made of a relatively soft, tough steel, for example 42CrMo4.
  • the front area it forms a support part 25 onto which the hard material elements 12 and the protective elements 13 are soldered.
  • a recess 26 is formed in the support part 25 towards a front end face 21.2, into which the cuboid hard material elements 12 are embedded.
  • the front sides of the hard material elements 12 end with the front end face 21.2 of the base body and form a cutting surface 27 starting from the cutting edge section 18.
  • the top of the hard material elements 12 is flush with the top of the protective elements 13 adjoining the hard material elements 12.
  • the top of the protective elements 13 forms a section of the support surface 29.
  • the protective elements 13 are arranged flush between the hard material elements 12 and the web 28.
  • the web 28 serves to position and hold the protective elements 13, in particular during the soldering process during production.
  • a support plane 21.1 Adjacent to the web 28, a support plane 21.1 is provided which is recessed relative to the support of the protective elements 13. Starting from the support plane 21.1, the base body 20 is supported by three offset, countersunk holes. Fastening holes 22 and two threaded holes 24 penetrate the housing.
  • the base body 20 is laterally delimited by two plane-parallel side surfaces 21.3, on which the base bodies 20 lie against one another when arranged on the carrier 11.
  • the base body 20 ends in a rear end stop surface 21.4, in the middle of which the positioning receptacle 23 is preferably recessed as a throat-shaped recess.
  • the base body 20 thus forms the basis for a segment 16 of the counter blade 10.
  • the base body 20 can be easily and safely mounted to the carrier 11 using the fastening receptacles 22 and screws.
  • the countersinking on the fastening receptacles 22 allows the screws to be countersunk so that they do not protrude beyond the support plane 21.1.
  • Figure 1 The cover plate 30 shown can thus be placed on the support plane 21.1 of the base body 20 and screwed tightly to the threaded receptacles 24.
  • the soft steel used retains its properties during the soldering process of the hard material elements 12 and protective elements 13.
  • Fig.3 shows the representation according to Figure 2 as an exploded view with a cover plate 30.
  • the cover plate 30 is above the Figure 2 described base body 20. Starting from its upper side, it is penetrated by two countersunk holes 32, to which two mounting screws 34 are assigned. Furthermore, the threaded hole 33 is guided through the cover plate.
  • the dimensions of the cover plate 30 are selected to match the dimensions of the support surface 21.1 of the base body 20.
  • the holes 32 are arranged in such a way that when the cover plate 30 is placed on top, they are aligned with the threaded receptacles 24 of the base body 20.
  • the mounting screws 34 can thus be guided through the holes 32 and screwed into the threaded receptacles 24.
  • the cover plate 30 is thus firmly connected to the base body 20.
  • the screw heads of the assembly screws 34 are recessed in the cover plate 30.
  • the upper side of the cover plate 30 thus forms, together with the adjoining web 28 and the upper side of the protective elements 13, a continuous, flat support surface 29 on which the material to be cut can be fed to the cutting edge section 18 and thus to the cutting edge 14.
  • the fastening receptacles 22 and the screws inserted therein for mounting the base body 20 to the carrier 11 are covered by the cover plate 30 and are thus protected from wear.
  • the cover plate 30 itself is made of a steel that is harder than the base body 20 but still tough, for example Hardox 400. This means that the support surface 29 is completely protected against wear. Should the cover plate 30 nevertheless wear out prematurely or become damaged, it can be replaced separately and the high-quality hard metal components can continue to be used.
  • Figure 4 shows a top view of a segment 16 of the counter-blade 10 in the assembled state.
  • the cover plate 30 is held in the base body 20 by the countersunk mounting screws 34. It ends at the web 28 towards the protective elements 29.
  • the top of the segment 16 thus forms a continuous support surface 29 up to the cutting edge section 18.
  • the segment 16 can thus be easily and quickly aligned precisely in position relative to the carrier 11 by pushing the positioning receptacles 23, 35 of the base body 20 and the cover plate 30 onto a positioning projection 17 of the carrier 11.
  • Figure 5 shows in side view the Figure 4 shown segment 16 of the counter blade 10 along a Figure 4 cutting line marked VV.
  • the cover plate 30 is held to the base body 20 with the assembly screw 34.
  • the base body 20 forms a curve 28.1.
  • the edge of the cover plate 30 has a first bevel 31.1 in the area of the curve 28.1, so that the cover plate 30 can be placed flush on the support plane 21.1 of the base body 20.
  • the curve 28.1 reduces stress peaks in the area of the transition from the web 28 to the support plane 21.1.
  • the cover plate 30, the web 28, the protective elements 13 and the hard material elements 12 form a continuous support surface 29 which, when assembled, merges flush with a corresponding surface of the carrier 11.
  • the material to be cut can thus be fed to the cutting edge section 18 and thus to the cutting edge 14 via the surface of the carrier 11 and the support surface 29.
  • a second bevel 31.2 is provided on the cover plate 30 at the transition from the support surface 29 to the corresponding surface of the carrier 11. This prevents a step from forming between the surface of the carrier and the support surface 29, for example due to manufacturing tolerances or abrasion of the carrier 11, which then leads to increased wear due to the material to be cut being guided over it.
  • the edge of the cover plate 30 can also be rounded over a radius to the second bevel 31.2. A radius creates a particularly break-resistant edge that can withstand very high loads.
  • a base body underside 21.5 of the base body 20 is designed as a flat surface arranged plane-parallel to the support surface 29.
  • the base body 20 can rest thereon along a mounting plane on a corresponding counter surface of the carrier 11.
  • Figure 6 shows a second segment 49 of a second counter cutting edge (not shown) with two cutting edges.
  • a second base body 40 is designed as a substantially elongated cuboid. Along two opposite long edges of the cuboid, the second base body 40 has a front recess 46.1 and a rear recess 46.2, into which front hard material elements 41.1 and rear hard material elements 41.2 are introduced.
  • a row of front protective elements 42.1 and rear protective elements 42.2 which are also made of a hard material, are arranged adjacent to the hard material elements 41.1, 41.2.
  • the front and rear hard material elements 41.1, 41.2 and the front and rear protective elements 42.1, 42.2 are made of hard metal.
  • a second web 45 formed onto the second base body 40 is arranged between the rows of protective elements 42.1, 42.2.
  • second fastening receptacles 44 in the form of stepped holes are provided, which penetrate the base body 40.
  • the upper sides of the front and rear hard material elements 41.1, 41.2, the front and rear protective elements 42.1, 42.2 and the second web 45 45 form a flat second support surface 47.
  • the front and rear holding elements 41.1, 41.2 represent a front cutting edge section 43.1 and a rear cutting edge section 43.2.
  • the second base bodies 40 can be arranged in a row on a carrier (not shown) and connected to it with screws guided through the second fastening receptacles.
  • positioning projections or positioning receptacles can be provided on their underside, which engage in corresponding positioning receptacles or positioning projections of the carrier.
  • the underside of the second base body 40 forms a mounting plane with the top of the carrier, in which the positioning receptacles and positioning projections are arranged.
  • the second base bodies 40 each have two short-sided end faces 48, which are designed to be flat, so that the second base bodies 40 can be arranged flush with one another on the carrier.
  • the front and rear cutting edge sections 43.1, 43.1 of the second segments 49 arranged in a row form a front and a rear cutting edge of the second counter cutting edge.
  • knives are guided past both cutting edges. Material that is introduced into the area of the cutting edges is shredded between the cutting edges and the passing knives.
  • the small hard material elements 41.1, 41.2 and protective elements 42.1, 42.2 used also lead to a long service life of the second counter cutting edge. Breaks in one of the hard metal components are not passed on to the next hard metal component. If necessary, individual second segments 49 can be quickly replaced.
  • the positioning receptacles mounted in the assembly plane between the underside of the second base body 40 and the carrier enable and positioning approaches enable quick and precise positioning of the replacement segments.
  • the cover plates 30 can be arranged laterally offset from the base bodies 20 in such a way that the abutting edges formed along the side surfaces 21.3 between the base bodies 20 arranged next to one another are covered by the cover plates 30.
  • a cover plate 30 is then screwed to a first base plate 30 at one of its bores 32 and to an adjacent second base plate 30 at its second bore 32.
  • the outermost base plates 30 arranged on a counter-blade 10 are each designed in a shortened or an extended form, for example with half or one and a half the width of a base body 20 measured in the direction of the longitudinal extension of the counter-blade.
  • the advantage here is that no continuous gap is formed between the cover plates 30 and the base bodies 20 up to the carrier 11, into which waste material can be pressed.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)

Claims (15)

  1. Contre-couteau (10), en particulier pour une déchiqueteuse de bois, pour la fabrication de copeaux de bois, avec au moins une arête de coupe (14) formée d'un matériau dur et une surface d'appui (29) menant à l'arête de coupe (14), l'arête de coupe (14) étant formée d'une pluralité d'éléments en matériau dur (12) disposés côte à côte le long de l'arête de coupe (14) sur au moins un corps de base (20), la surface d'appui (29) présentant, le long des éléments en matériau dur (12) formant l'arête de coupe (14), une pluralité d'éléments de protection (13) en matériau dur alignés les uns à côté des autres, qui se raccordent aux éléments en matériau dur (12),
    caractérisé
    en ce que la surface d'appui (29) est formée, dans le raccordement direct ou indirect aux éléments de protection (13), par respectivement une plaque de recouvrement (30) montée sur chaque corps de base (20).
  2. Contre-couteau (10) selon la revendication 1, caractérisé en ce que respectivement une partie des éléments en matériau dur (12) est disposée le long d'une arête du corps de base (20) et en ce que l'arête de coupe (14) est formée par les éléments en matériau dur (12) de corps de base (20) disposés les uns à côté des autres.
  3. Contre-couteau (10) selon la revendication 1 ou 2, caractérisé en ce que les éléments en matériau dur (12) sont réalisés en forme de parallélépipède ou de trapèze, en ce que chaque fois une arête longue du parallélépipède ou du trapèze forme une partie de l'arête de coupe (14) et en ce que les parallélépipèdes ou les trapèzes sont alignés les uns contre les autres le long de leur surface délimitée par leurs arêtes courtes.
  4. Contre-couteau (10) selon l'une des revendications 1 à 3, caractérisé en ce que le corps de base (20) présente, le long de l'arête de coupe (14), un évidement (26) dans lequel les éléments en matériau dur (12) sont logés à fleur d'une face frontale avant (21.2) du corps de base (20) et/ou à fleur de la surface d'appui (29) ou que les éléments en matériau dur (12) sont insérés dans l'évidement (26) de telle sorte qu'ils dépassent de la face frontale avant (21.2) et/ou de la surface d'appui (29) ou que les éléments en matériau dur (12) sont insérés dans l'évidement (26) de telle sorte qu'ils sont en retrait par rapport à la surface d'appui (29).
  5. Contre-couteau (10) selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les éléments de protection (13) affleurent les éléments en matériau dur (12) ou sont disposés à distance des éléments en matériau dur (12) par une fente, et en ce qu'il peut notamment être prévu que les transitions entre les éléments de protection (13) sont disposées de manière décalée dans l'espace par rapport aux transitions entre les éléments en matériau dur (12) dans le sens d'extension de l'arête de coupe (14).
  6. Contre-couteau (10) selon la revendication 5, caractérisé en ce que, en partant du corps de base (20), l'épaisseur de matériau des éléments en matériau dur (12) est choisie supérieure à l'épaisseur de matériau des éléments de protection (13), et/ou en ce que l'épaisseur de matériau des éléments en matériau dur (12) et/ou l'épaisseur de matériau des éléments de protection (13) est choisie différente pour différents corps de base (20).
  7. Contre-couteau (10) selon l'une des revendications 1 à 6, caractérisé en ce que le corps de base (20) est formé d'un acier comparativement mou et tenace et la plaque de recouvrement (30) est formée d'un acier comparativement dur par rapport à celui-ci.
  8. Contre-couteau (10) selon l'une des revendications 1 à 7, caractérisé en ce que le corps de base (20) forme une entretoise (28) entre les éléments de protection (13) et la plaque de recouvrement (30).
  9. Contre-couteau (10) selon l'une des revendications 1 à 8, caractérisé en ce que le corps de base (20) forme, sur le côté opposé à l'arête de coupe (14), un plan d'appui (21.1) sur lequel la plaque de recouvrement (30) est maintenue à plat.
  10. Contre-couteau (10) selon l'une des revendications 1 à 9, caractérisé en ce que le corps de base (20) présente des logements de fixation (22) destinés à recevoir des éléments de fixation pour fixer le corps de base (20) à un support et en ce que la plaque de recouvrement (30) présente des alésages (32) destinés à recevoir des vis de montage (34) pour fixer la plaque de recouvrement (30) sur le corps de base (20), la plaque de recouvrement (30) recouvrant les logements de fixation (22) du corps de base (20) à l'état monté.
  11. Contre-couteau (10) selon l'une quelconque des revendications 1 à 10, caractérisé en ce que la plaque de recouvrement (30) comporte une portion de dégagement, de préférence un trou taraudé (33).
  12. Contre-couteau (10) selon l'une des revendications 1 à 11, caractérisé en ce que le corps de base (20) présente une deuxième arête de coupe (43.2).
  13. Contre-couteau (10) selon l'une des revendications 1 à 12, caractérisé en ce que le corps de base (20) comporte un logement de positionnement (23) ou un appendice de positionnement destiné à recevoir un appendice de positionnement (17) ou un logement de positionnement disposé sur le support (11).
  14. Contre-couteau (10) selon la revendication 13, caractérisé en ce que le logement de positionnement (23) ou l'appendice de positionnement (17) est disposé le long d'une surface de butée frontale du corps de base (20) opposée à l'arête de coupe (14) ou en ce que le logement de positionnement (23) ou l'appendice de positionnement (17) est disposé le long d'un plan de montage du corps de base (20) opposé au plan d'appui (21.1).
  15. Contre-couteau (10) selon l'une des revendications précédentes, caractérisé en ce que la plaque de recouvrement (30) présente sur sa face frontale opposée à l'arête de coupe (14) un logement de positionnement (35) et/ou un appendice de positionnement.
EP14838783.0A 2014-04-30 2014-12-23 Contre-lame Active EP3137271B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014106037.7A DE102014106037A1 (de) 2014-04-30 2014-04-30 Gegenschneide
PCT/EP2014/079169 WO2015165556A1 (fr) 2014-04-30 2014-12-23 Contre-lame

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EP3137271A1 EP3137271A1 (fr) 2017-03-08
EP3137271B1 true EP3137271B1 (fr) 2024-04-24

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US (1) US10562035B2 (fr)
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DE (2) DE102014106037A1 (fr)
DK (1) DK3137271T3 (fr)
ES (1) ES2978928T3 (fr)
FI (1) FI3137271T3 (fr)
HU (1) HUE067432T2 (fr)
PL (1) PL3137271T3 (fr)
PT (1) PT3137271T (fr)
WO (1) WO2015165556A1 (fr)

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TWM546288U (zh) 2016-07-26 2017-08-01 米沃奇電子工具公司 棘輪件、棘輪件配件及其套組
GB201721690D0 (en) * 2017-12-22 2018-02-07 Element Six Uk Ltd Striking tool for use in a high speed comminution mill
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DE102019116945A1 (de) 2019-06-24 2020-12-24 Betek Gmbh & Co. Kg Gegenschneide
JP2024531186A (ja) * 2021-08-09 2024-08-29 エスエスアイ シュレッディング システムズ インコーポレイテッド カッタ組立体を有する産業用機械

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Publication number Publication date
FI3137271T3 (fi) 2024-05-29
EP3137271A1 (fr) 2017-03-08
DE202014011091U1 (de) 2017-10-19
ES2978928T3 (es) 2024-09-23
US20170008005A1 (en) 2017-01-12
HUE067432T2 (hu) 2024-10-28
US10562035B2 (en) 2020-02-18
WO2015165556A1 (fr) 2015-11-05
DK3137271T3 (da) 2024-05-21
DE102014106037A1 (de) 2015-11-05
PT3137271T (pt) 2024-05-22
PL3137271T3 (pl) 2024-08-26

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