EP0879680A2 - Dispositif de fixation des couteaux dans un rotor de coupe - Google Patents

Dispositif de fixation des couteaux dans un rotor de coupe Download PDF

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Publication number
EP0879680A2
EP0879680A2 EP98810352A EP98810352A EP0879680A2 EP 0879680 A2 EP0879680 A2 EP 0879680A2 EP 98810352 A EP98810352 A EP 98810352A EP 98810352 A EP98810352 A EP 98810352A EP 0879680 A2 EP0879680 A2 EP 0879680A2
Authority
EP
European Patent Office
Prior art keywords
area
sheet
rotor body
wear
rotor
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.)
Withdrawn
Application number
EP98810352A
Other languages
German (de)
English (en)
Other versions
EP0879680A3 (fr
Inventor
Heinrich Prof. Dr. Ing. Feichtinger
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0879680A2 publication Critical patent/EP0879680A2/fr
Publication of EP0879680A3 publication Critical patent/EP0879680A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • B26D7/2628—Means for adjusting the position of the cutting member

Definitions

  • the present invention relates to cutting rotors according to Preamble of claim 1.
  • Such cutting rotors are e.g. B. for the granulation of extruded plastic strands used.
  • the lead Knives distributed over the circumference of the rotor with little Slip a rotational movement against z. B. one fixed knife.
  • the cutting knives are preferably made from one highly wear-resistant material, e.g. a hard metal chosen.
  • the rotor body is not the real thing Cutting event involved, however, its subject to between the outer surfaces of the effect of partially highly accelerated particles from the Cutting process. Since the plastic strands partly with Fibers made of glass and other materials can be reinforced this leads to a strong abrasive wear of parts of the rotor surface. This can attack this be met that for the rotor body a corresponding wear-resistant material is selected or that at least its exposed surfaces with a Protective layer.
  • a known form of manufacture of such rotors is one joined composite, in which the cutting knife with the Rotor body to be soldered to a fixed unit.
  • the knives wear out with increasing service life. she can be reground several times, but the Time when the entire rotor has to be replaced. In addition to this even aging, there is also Disturbance events in which one or more knives are already short duration of use are damaged so that the entire Rotor must be replaced.
  • the knives are pressed with at least one partial surface against at least one surface of the more or less complex shaped groove.
  • the pressing force is usually generated by a screw or an eccentric
  • the force is usually transferred to the knife via a wedge or a conical or cylindrical surface.
  • the functions of force generation and transmission are combined in one element, for example in the form of a screw with a cone head.
  • a cutting tool for strand pelletizing of plastics in which the cross section of the cutting knives has a dovetail profile in the lower fastening area.
  • This profile must be inserted laterally into the groove, because the larger width at the bottom of the groove tapers towards the top of the seat surfaces that converge conically on both sides, against which the corresponding surfaces of the knife are pressed using a conical screw.
  • the cone of this screw presses on a sharp-angled groove of the dovetail profile, which is arranged on the underside of the knife in the middle between the surfaces to be pressed.
  • this groove Apart from the complex shape of the groove, which does not allow the knives to be inserted directly vertically, this groove, with its sharp protruding angle, represents a mechanical weakening of the knife body.
  • CH-A5-678027 describes a cutting rotor in which both the geometry of the knife and the groove are made much simpler.
  • the knife with its plane-parallel side surfaces can be inserted vertically into a narrow groove.
  • One of the two side surfaces has an indentation at both ends in the form of a cylindrical or conical clamping surface, against which a conical screw arranged on the side and slightly offset to the knife recess exerts pressure.
  • No. 4,360,168 describes an arrangement in which two adjacent knives are pressed against the side surfaces of a groove on both sides of the wedge body by a conical wedge body, which is tightened against the rotor body with a countersunk screw, and are thus held together in position will.
  • this design has the advantage that adjacent pairs of knives can be removed and replaced without having to dismantle the rotor, because no lateral manipulations, such as inserting the knives or actuating the cone screws, are necessary.
  • the disadvantage of this construction is that the screw heads are directed against the outer circumferential surface of the rotor that is subject to wear.
  • An object of the present invention is a rotor specify the clamping device against abrasive Wear is protected. There is another task in specifying a rotor in which the knives safely in Rotor are jammed.
  • the rotor according to the invention solves at least one of the above two tasks.
  • a first area of a sheet is between one the side surfaces of the knife and the groove or the Inserted clamping body and the over the rotor body the groove protruding area of the sheet angled, so that he is the one between two neighboring knives located surface of the rotor body and / or the Clamping device against abrasive wear due to the Cutting material protects.
  • the sheet is preferably made of a wear-resistant material or has a surface made of such a material.
  • the first area of the Sheet metal between one of the side surfaces of the knife and the groove or the clamping body is inserted, corrugated so that it acts as a force-carrying elastic component the clamping works.
  • FIG. 1 a shows the cross section through a rotor body 2, which is basically shaped in the sense of CH-A5-678027 , because the cone 4 of a screw 3 is pressed into a bulge 104 of the knife 1.
  • the surface of the knife 1 does not press directly against the side surface 2013 of the groove 201, but rather on the area 502 of a plate 5 which has been inserted between the knife and the side wall of the groove. With its elastic tension, this area 502 serves as a resilient safety element for maintaining the pressing tension.
  • This securing function is further enhanced if the sheet has a corrugation in this area in accordance with the main claim and FIG. 4c, which is pressed into the plane during pressing and thus keeps the pressing permanently under tension.
  • the sheet metal 5 also contains an angled area 501, which in this example runs largely parallel and directly adjoining the surface 202 of the rotor body 2 and thus covers it in a protective manner.
  • the mudguard 5 also contains a further area 503, which protects the metal sheet from being pulled out of the groove channel. This area can also be omitted, because the good adhesion of the corrugated sheet in particular in the area 502 ensures high static friction against the groove and knife.
  • Fig. 1b shows a longitudinal section through a typical Cone screw, as shown in Fig. 1a and in Fig. 2 for Application can come. It consists e.g. from the Screw head 3 with hexagon socket, the conical Press body 4 and the threaded part 301.
  • Fig. 2 shows a construction in which a pressure similar to EP-A-0 182'037 is generated.
  • a complex-shaped knife 11 is pressed by a screw 3 with its conical body 4 upwards against the groove surfaces 213 and 213 '.
  • the pressing surface 114 of the knife 11 was not constructed as a notched, roof-shaped recessed surface, but as a round indentation.
  • This change which is not essential for the present patent concept, brings the following advantages: on the one hand, the tension intensity, which is high at a sharp protruding angle in the edge area, is significantly reduced.
  • the original construction leads to an undefined four-point support, since the inscribed circular surface 4 of the screw 3 must simultaneously press onto the two base surfaces 211 of the groove 21 and the two protruding surfaces of the knife 11.
  • a defined three-point pressure occurs between the concave surface 114 of the knife 11 and the two bottom surfaces 211 of the groove 2.
  • FIG. 3a shows a first variant of the invention Construction, which is similar to US-4,360,168 with a Wedge 42 holds two adjacent knives 12 in position.
  • the knife 12 As a major improvement over this patent, however is also not relevant in the sense of the patent concept the knife 12, however, no longer with plane-parallel ones Side surfaces 123 and 124 equipped, but this Surfaces have an angle of attack against each other. Thereby is effectively prevented that the clamped knife from the Clamp bracket can slip.
  • the wedge 42 with the screw 31 against an internal thread 226 on the bottom of the in the rotor body 22nd located groove 221 drawn.
  • the clamping wedge 42 presses on the one hand with its surface 424 against the area 522 of the Fender 53, which in turn on the surface 124 of the left knife 12 presses and on the other hand with its surface 424 'against the surface 123 of the right knife 12.
  • the sheet 53 has in its area 531 facing the surface a bore 5311, which has a minimum diameter owns, so that e.g. an Allen key in alignment can be inserted into the head of the screw 31.
  • This Hole impairs the Protective effect of the area 531 of the sheet 53, however experience has shown that the cutting process does not all surface areas are abrasive in the same way be claimed.
  • FIG. 3b shows a variant of the previous construction, which according to claim 7 an improved protection for the head of the screw 31 offers.
  • An example was a square hole 5411 over three Sides punched out and the punched out area 5412 after angled at the top so that when installed it is a Protective cover towards the top right in the picture lying cutting edge of the knife 12 so that direct Impact of particles into hole 5412 is not possible and the head of the screw 31 is thus in the slipstream located.
  • such Protective cover 5412 also formed with a separate sheet which e.g. with the surface of area 541 of the Fender 54 would be welded.
  • FIG. 3c shows a further variant of the construction, which basically the design of Fig. 3a based on where a hole is made through the fender has been.
  • a cylindrical cover pin 6 through the through hole 5511 of the area 552 of the fender 55, which largely covers this.
  • the lower area of the Cover pin 6 has a hexagonal cross section and fits in the head of screw 31.
  • FIG. 3d is the cross section through a clamping wedge 42 with his Fender 56 shown.
  • a Cover pin 61 through hole 5611 of fender 56 as well through a hole in a cover plate 57 underneath inserted into the head of the screw 31.
  • 3e is the top view in the direction of arrow 9 of FIG. 3d.
  • the clamping pins 611 can be inserted through the Hole 5611 of area 561 of fender 56 through the corresponding side slots 5611 'are pushed until abut them on the cover plate 57.
  • 3f shows a particularly simple variant for Protection of the screw head.
  • the uppermost area of the cover pin 62 is again a hexagon 621 in this example Rotate this hexagon 621 with a suitable tool a torque can be exerted on the head of the screw 31 will.
  • the outwardly projecting areas 622 and 621 either from one wear-resistant material or a corresponding have a hardened surface. It goes without saying also possible the part 62 directly with the head of the screw 31 by welding, soldering or gluing. If the head of the screw 31 is larger than the diameter 5611 the hole is in the area 561 of the sheet, the cylindrical disc 623 is omitted. Of course you can however, a special screw can also be used which passes the screw 31 directly into the part 62, so that an addition is superfluous.
  • fenders are made from one highly wear-resistant material, e.g. a special tool steel, manufactured.
  • a highly wear-resistant material e.g. a special tool steel
  • an expensive material can also be used.
  • a sheet 58 in its outward facing area 582 with a Protective layer 7 was coated. It can e.g. a layer of ceramic, hard metal, or another Trade hard material, which e.g. by means of plasma or Flame spraying was applied. On the other hand, they remain closed clamping area 581 and area 583, which against Slip out the mudguard should protect this Example uncoated.
  • Fig. 4b shows a variant in which a sheet 58 in its outward area 582 was borated. At In this example, area 581 was not hardened, though this could easily be done as a result of the Eliminating places to be masked a more economical Manufacturing is possible.
  • Fig. 4c shows a variant, which in the sense of Main claim in addition to protection against abrasion second essential function of such a sheet 59 shows.
  • the outside was directed area coated with a ceramic layer 71.
  • the area 591 over which the pressing takes place has been equipped with wave structures 5911. Similar to these wave structures are used in a clamping ring Clamping process bent into the plane and adjust it securing elastic spring element, which a Loosening of the clamping screw prevented.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Crushing And Pulverization Processes (AREA)
EP98810352A 1997-04-22 1998-04-22 Dispositif de fixation des couteaux dans un rotor de coupe Withdrawn EP0879680A3 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH93397 1997-04-22
CH93397 1997-04-22
CH933/97 1997-04-22

Publications (2)

Publication Number Publication Date
EP0879680A2 true EP0879680A2 (fr) 1998-11-25
EP0879680A3 EP0879680A3 (fr) 1999-11-03

Family

ID=4198550

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98810352A Withdrawn EP0879680A3 (fr) 1997-04-22 1998-04-22 Dispositif de fixation des couteaux dans un rotor de coupe

Country Status (1)

Country Link
EP (1) EP0879680A3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003055657A1 (fr) * 2001-12-29 2003-07-10 Leon Terlecki Support de couteau segmente de decoupeuse a bois
DE102016123079A1 (de) * 2016-11-30 2018-05-30 TKM GmbH Mehrteiliges Langmesser

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE722157C (de) * 1938-06-28 1942-07-02 Jagenberg Werke Ag Querschneider mit umlaufendem Messer
DE1199477B (de) * 1964-06-06 1965-08-26 Condux Werk Maschine zum Zerspanen, insbesondere von Holz
DE2932582A1 (de) * 1979-08-10 1981-02-26 Pallmann Kg Maschf Messerwelle fuer holzzerspanungsmaschinen
EP0033382B1 (fr) * 1980-01-31 1984-11-28 HOMBAK Maschinenfabrik GmbH u. Co KG Outil rotatif pour la fabrication de copeaux de bois plats
EP0095912B1 (fr) * 1982-06-01 1988-03-23 Harris Graphics Corporation Support pour lames
DE19518609C1 (de) * 1995-05-23 1996-02-01 Maier Zerkleinerungstech Gmbh Zerspaner für Hackschnitzel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003055657A1 (fr) * 2001-12-29 2003-07-10 Leon Terlecki Support de couteau segmente de decoupeuse a bois
DE102016123079A1 (de) * 2016-11-30 2018-05-30 TKM GmbH Mehrteiliges Langmesser

Also Published As

Publication number Publication date
EP0879680A3 (fr) 1999-11-03

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