EP3235572A1 - Ensemble de couteaux - Google Patents

Ensemble de couteaux Download PDF

Info

Publication number
EP3235572A1
EP3235572A1 EP16166443.8A EP16166443A EP3235572A1 EP 3235572 A1 EP3235572 A1 EP 3235572A1 EP 16166443 A EP16166443 A EP 16166443A EP 3235572 A1 EP3235572 A1 EP 3235572A1
Authority
EP
European Patent Office
Prior art keywords
knife
rotor
knives
shredder
sacrificial piece
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.)
Granted
Application number
EP16166443.8A
Other languages
German (de)
English (en)
Other versions
EP3235572B1 (fr
Inventor
Tomas BÄCKMAN
Magnus Blom
Thomas Ericsson
Henrik Karlsson
Kurt SJÖBERG
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.)
Rapid Granulator AB
Original Assignee
Rapid Granulator AB
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 Rapid Granulator AB filed Critical Rapid Granulator AB
Priority to EP16166443.8A priority Critical patent/EP3235572B1/fr
Priority to PL16166443T priority patent/PL3235572T3/pl
Publication of EP3235572A1 publication Critical patent/EP3235572A1/fr
Application granted granted Critical
Publication of EP3235572B1 publication Critical patent/EP3235572B1/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
    • B02C18/186—Axially elongated knives

Definitions

  • the present invention concerns a knife assembly for a size reduction machine, such as a shredder or a granulator, which comprises at least one fixed knife and a rotor with rotatable knives, arranged around the periphery of the rotor.
  • a size reduction machine such as a shredder or a granulator
  • the present invention also concerns a size reduction machine, such as a shredder or a granulator.
  • Shredders are used in many fields for size reduction of different materials, for example mixed garbage or waste from building sites. They are also used for size reduction of selected, more uniform materials, such as wood or plastics, either to make the material less bulky or to prepare it for further processing.
  • Shredders for plastics are often used for preparing large and/or heavy plastic parts for the production of plastic granules in a granulator mill, which requires smaller and more homogeneous parts in order to work as efficiently as possible and with as little downtime as possible. The resulting granules are often recycled in the production of new objects. Shredders work with a slower rotor speed than regular mills, and are more robust, in order to handle large or heavy pieces.
  • a shredder or a granulator is provided with a hopper, for receiving the parts which are to be cut into smaller pieces.
  • a pusher is provided for pushing the parts towards the rotor, which is provided with knives.
  • the knives are in some cases arranged at two levels on the rotor. Other arrangements of the knives on the rotor are well known in the art.
  • the knives on the rotor cooperate with fixed knives, and cut the plastics material between them.
  • the knives are arranged on the rotor with the aid of knife holders, which are fairly expensive, and as each knife requires a knife holder, they represent a considerable cost in the production and maintenance of the shredder. Also, the rotor itself is very expensive and difficult to exchange in case it is damaged. Protecting the rotor from damages is hence a top priority.
  • the knives are often subject to considerable forces during use, the rotor, the knives, or the knife holders sometimes risk being deformed or damaged, and the knives are difficult to demount, exchange, and position without damage to the rotor.
  • the forces on the knives during use of the shredder also contribute to wearing out the rotor after a considerable period of use.
  • a knife that breaks loose during operation of the shredder, may cause considerable damage to the inside of the hopper, to the pusher, to the rotor, or to the fixed knives. Also, a sudden stop of the rotor due to a jammed knife could damage the transmission or the motor of the shredder or granulator.
  • the objects forming the basis for the present invention are attained if the knife assembly mentioned in the introduction is characterized in that a sacrificial piece is arranged between the rotor and each knife for positioning and fixing of the knife.
  • the objects are attained if it is characterized in that it includes said knife assembly.
  • Fig. 1 shows a shredder 1 according to the invention.
  • the shredder 1 has a hopper 2 into which the plastic material, which is to be comminuted, is to be received.
  • the shredder is also provided with a pusher 3, which pushes the material towards a rotor 4, which cuts the material into smaller pieces with the aid of knives on the rotor 4 and at least one stationary knife 22 (see fig. 2 ).
  • a pusher 3 which pushes the material towards a rotor 4
  • large lumps of plastics may be cut into uniformly sized chips.
  • outlet 5 for evacuation of the uniformly sized chips of plastic material resulting from the cutting by the rotor 4.
  • the outlet 5 may be connected to a conveyor, for transporting the plastic chips to a granulating mill and from there into the production of goods.
  • Fig. 2 shows a section of the shredder according to Fig. 1 . From the section it is clear how the hopper 2 funnels down into a narrower, lower part 2a, wherein the pusher 3 operates in order to make sure that all the material reaches the rotor 4, and is eventually cut into smaller pieces. These smaller pieces are fed into the outlet 5, which is next to the rotor 4, as can be seen in Fig. 2 .
  • Fig. 3 is a perspective view of the rotor 4.
  • the rotor is, in the present embodiment, provided with a screen 6, which is perforated.
  • the screen is arranged on that side of the rotor 4 which faces away from the lower part 2a of the hopper 2.
  • the uncovered side of the rotor 4 may be discerned in Fig. 3 .
  • the rotor 4 is, in this embodiment, provided with annular ridges 7 and valleys 8.
  • a number of knives 9 are arranged on the ridges 7 as well as in the valleys 8, which will be clearer in Fig. 4 , which is a plan view of the rotor 4.
  • the knives 9 are arranged spaced around the rotor 4 in two sets in the embodiment shown.
  • One set of knives 9 are arranged on the ridges 7 in a V-shaped formation, which extends over approximately half the periphery of the rotor 4.
  • the other set of knives 9 are arranged in the valleys 8 in a similar formation, extending over the other half of the periphery.
  • the arrangement of the knives 9 is known as such in the prior art, and serves to distribute the reaction forces from the cutting, so that the operation of the shredder 1 will run as smoothly and efficiently as possible. Also, the distribution allows the material, which is to be cut, to advance in small steps towards the rotor 4, each time the rotor 4 has rotated half a turn, as the knives 9 are alternatingly arranged at an outer level of the rotor 4, on the ridges 7, on the first half and at an inner level, in the valleys 8, on the second half.
  • Fig. 5a shows a section through the rotor 4 at one of the ridges 7.
  • a knife 9 is secured in a recess 12 in the ridge 7, with the aid of a fastening screw 10.
  • the fastening screw 10 extends approximately radially through a bore 20 in a mounting wedge 18, which acts as a holder for the knife 9, and into a threaded bore 19 in the rotor 4.
  • the mounting wedge 18 is arranged in close contact with the knife 9, and the oblique, contacting surfaces on the wedge 18 and the knife 9, respectively, ensure that the knife 9 is pushed towards the sacrificial piece 11 and the seat on the rotor 4, as the fastening screw 10 is tightened.
  • the diameter of the bore 20 through the wedge 18 is slightly larger than the diameter of the fastening screw 10. Hence there is usually no contact between the inner surface of the bore 20 in the mounting wedge 18 and the exterior of the fastening screw 10. However, the inner surface of the bore 20 is threaded in the preferred embodiment. This thread is of a larger dimension than the thread of the fastening screw 10, and the two threads are not intended to interact when the fastening screw 10 is screwed through the bore 20 in the wedge 18.
  • the purpose of the larger thread in the bore 20 is to provide a means for fastening a larger bolt in the event of deformation or displacement of the wedge 18. By fastening a larger bolt in the bore 20, the wedge 18 may be pulled out of the recess 12, where it may be accidentally stuck, due to the deformation or displacement.
  • the wedge 18 will be pressed against the knife 9 with its slanting surface 21. At its opposite end, the wedge 18 is in contact with one of the inner walls of the recess 12 of the rotor 4.
  • the depth of the recess 12 is large enough to allow for a maximum pressure on the knife 9 from the wedge 18, as the wedge 18 is forced downwards by the fastening screw 10.
  • the wedge 18 is unable to reach the bottom of the recess 12, since the size and shape of the knife 9, in contact with the slanting surface 21 on the wedge 18, will be the limiting factor of how deep into the recess the wedge 18 may be forced.
  • the space between the wedge 18 and the bottom of the recess 12 also ensures a secure fixation even when the parts have become worn with use or in cases of minor deficiencies in manufacture.
  • a sacrificial piece 11 is arranged between the knife 9 and the rotor 4 in the recess 12.
  • the sacrificial piece 11 has a shape which on at least one, first surface is complementary to the shape of the recess 12, i. e. the seat of the rotor. On at least one other surface the sacrificial piece 11 is complementary to the shape of the knife 9.
  • the sacrificial piece 11 is manufactured from a softer material than the materials of the rotor 4, the wedge 18, and the knife 9, respectively.
  • the sacrificial piece 11 is fairly cheap to manufacture and easy to exchange, while especially the rotor 4 is a more expensive components of a higher-grade material. Hence the more expensive parts of the shredder 1 are protected, and the downtime for repairs and maintenance is kept to a minimum.
  • Fig. 5b shows a section through the rotor 4 at one of the valleys 8.
  • a recess 13 in each valley 8 for securing a knife 9 and a sacrificial piece 11 with the aid of a fastening screw 10 and a wedge 18, similar to the recesses 12 in the ridges 7.
  • the result is that a number of knives 9 are secured in different positions, extending over at least half the periphery of the rotor 4.
  • the knives 9 that are mounted in the valleys 8 are arranged at an inner level, i. e. at a level closer to the center, of the rotor 4, while the knives 9 at the ridges 7 are arranged at an outer level.
  • the two levels of knives 9 will enable the pusher 3 to push the plastic material to be shredded forward towards the rotor 4 in small steps, where it will alternatingly be cut by the knives 9 at the outer level and the inner level, respectively.
  • Fig. 6 shows the knife 9 according to the invention in greater detail in a perspective view.
  • the knife 9 has four sharp edges 15, which extend transversally to the intended direction of movement, when the knife 9 is mounted and rotating on the rotor 4, as seen e. g. in figures 5a and 5b .
  • the knife 9 has several symmetry planes in its preferred embodiment.
  • a first symmetry plane is a plane to which the intended direction of movement is a normal. This symmetry ensures that the knife 9 may be turned with the opposite surface facing forward, still fitting closely to the sacrificial piece 11, able to be positioned thereby.
  • a second symmetry plane extends in parallel with the top and bottom surfaces (as shown in Fig. 6 ) of the knife 9. This symmetry ensures that the knife 9 may be turned upside down, e. g. turned around the direction of movement, in order to arrange another sharp edge 15 in a cutting position, while the surface facing the sacrificial piece 11 still fits closely thereto and is still able to be positioned thereby.
  • a third symmetry plane is arranged in parallel with the side end surfaces of the knife 9. This symmetry ensures that all of each sharp edge 15 is able to cooperate with the fixed knives during operation of the shredder 1, in order to provide an efficient cutting of the plastic material.
  • the sharp edges 15 are arranged at the upper and lower surfaces, where the knife is widest.
  • the knife 9 tapers in the directions towards its center, resulting in an angle 16 near the middle portion of the knife 9.
  • This angle 16 functions mainly for the secure positioning of the knife 9, as the tapering surfaces on the knife cooperate with the sacrificial piece 11 on one side and with the wedge 18 on the other side.
  • it may function as an indication of fracture in the event of a failure during operation of the shredder. If the knife 9 breaks along the indication of fracture, only a limited part of the knife 9 will be let loose inside the shredder 1, and the risk of severe damages to the shredder 1 is low.
  • the side edges 17 of the knife 9 are beveled, which reduces the risk of breakage of the outer ends of the sharp edge 15. Also, the compact design of the knife 9, without any bores or threads through the knife 9, provides a greater resistance to cracks and breakage thereof.
  • Fig. 7 the knife 9 and the sacrificial piece 11 are shown from the side with a close fit, corresponding to their mounted state.
  • the shape of a second surface of the sacrificial piece 11 is, as mentioned earlier, complementary to the shape of the knife 9, which means that their respective surfaces are in close contact, and a well defined positioning of the knife 9 is attained.
  • the symmetry of the knife 9 will allow the knife 9 to be turned into another position with a retained close fit and well defined positioning, and with another sharp edge 15 facing forward for cutting the material.
  • the close fit will result in a transfer of forces on the knife 9 to the sacrificial piece 11.
  • the close fit will protect the knife 9 and the rotor 4 from damages, since excessive forces on the knife 9 will result in a deformation of the sacrificial piece 11, not damages to the knife 9 nor to the rotor 4. If only the sacrificial piece 11 has been deformed, demounting the knife 9 will be less problematic than if the knife 9 itself or parts of the rotor 4 around it have been deformed.
  • Another advantage of the close fit is that the risk of material getting stuck between the knife 9 and the rotor 4 or the sacrificial piece 11 is greatly reduced. Cleaning of the shredder 1, e. g. between batches of different material, will be easier and quicker, and the downtime will be reduced.
  • Fig. 7 the knife 9 and the sacrificial piece 11 are also seen with the fastening screw 10 and the wedge 18 mounted.
  • the knife 9 and the sacrificial piece 11 act as a stable unit, with the fastening screw 10 pulling the wedge 18 downwards, towards the center of the rotor 4, and being long enough to be able to extend into the threaded bore 19 in the rotor 4.
  • the knife 9 and the sacrificial piece 11 are pressed together so that they together will form the unit which is securely mounted in one of the recesses 12, 13 directly in the rotor 4.
  • the screw 10 extends some distance through the rotor 4, which results in a secure fit of the knife 9, and helps reducing the risk that the knife 9 is displaced from its position, when it is subjected to great forces during cutting.
  • the shape of the knife 9 may be varied. It would still be possible to mount the modified knife in the same recesses 12, 13 in the rotor 4, as long as corresponding modifications are made to the sacrificial piece 11, so that the close fit is maintained, and the outer shape of the unit of the knife 9 and the sacrificial piece 11 is the same.
  • the recesses 12, 13 are arranged for a different configuration of the fastening screw 10.
  • the fastening screw 10 extends approximately parallel to a tangential direction of the rotor 4, through a part of the rotor 4 as well as through through-going bores 14 in the knife 9 and the sacrificial piece 11, respectively.
  • the rotor may not be provided with a screen 6, as was described above for the preferred embodiment. Not all applications of the invention on a shredder 1 or a granulator will need a screen, and the presence of a screen is not necessary for the functionality of the knives 9.
  • annular ridges 7 and valleys 8, forming a rotor 4 with knives 9 at two different levels is not compulsory for the invention.
  • Alternative embodiments where all knives 9 are arranged in a single level, at a uniform distance from the center of the rotor 4, are conceivable.
  • Knits 9 there are alternatives to arranging the knives 9 in V-shaped formations. Some alternatives are knives 9 in spiral-shaped formations, or knives 9 arranged on alternating quarters of the rotor 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
EP16166443.8A 2016-04-21 2016-04-21 Ensemble de couteaux Active EP3235572B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16166443.8A EP3235572B1 (fr) 2016-04-21 2016-04-21 Ensemble de couteaux
PL16166443T PL3235572T3 (pl) 2016-04-21 2016-04-21 Zespół noży

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16166443.8A EP3235572B1 (fr) 2016-04-21 2016-04-21 Ensemble de couteaux

Publications (2)

Publication Number Publication Date
EP3235572A1 true EP3235572A1 (fr) 2017-10-25
EP3235572B1 EP3235572B1 (fr) 2018-11-28

Family

ID=55802310

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16166443.8A Active EP3235572B1 (fr) 2016-04-21 2016-04-21 Ensemble de couteaux

Country Status (2)

Country Link
EP (1) EP3235572B1 (fr)
PL (1) PL3235572T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109127027A (zh) * 2018-09-26 2019-01-04 东莞市宏湖智能装备有限公司 一种锂电池撕碎机的制造工艺

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1209319A (en) * 1914-04-20 1916-12-19 Philip S Mitts Machine for making sawdust.
DE2932582A1 (de) * 1979-08-10 1981-02-26 Pallmann Kg Maschf Messerwelle fuer holzzerspanungsmaschinen
DE3228852A1 (de) * 1972-03-24 1983-04-21 Inter-Wood-Maschinen GmbH & Co KG, 8923 Lechbruck Messeranordnung fuer schraegschnitt-messerwalzen
FR2515093A1 (fr) * 1981-10-26 1983-04-29 Clayton Cie Granulateur d'elements individuels de materiau, notamment de matiere plastique
US5775608A (en) * 1997-04-07 1998-07-07 Dumaine; Thomas J. Reversible granulator
DE102012110342A1 (de) * 2012-10-29 2014-04-30 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Rotorkörper für eine Zerkleinerungsvorrichtung, insbesondere einen Trommelhacker für die Zerkleinerung von Holz oder dergleichen
US20140319260A1 (en) * 2013-04-29 2014-10-30 Vermeer Manufacturing Company Cutter assembly and adjustable cutter for use in comminuting apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1209319A (en) * 1914-04-20 1916-12-19 Philip S Mitts Machine for making sawdust.
DE3228852A1 (de) * 1972-03-24 1983-04-21 Inter-Wood-Maschinen GmbH & Co KG, 8923 Lechbruck Messeranordnung fuer schraegschnitt-messerwalzen
DE2932582A1 (de) * 1979-08-10 1981-02-26 Pallmann Kg Maschf Messerwelle fuer holzzerspanungsmaschinen
FR2515093A1 (fr) * 1981-10-26 1983-04-29 Clayton Cie Granulateur d'elements individuels de materiau, notamment de matiere plastique
US5775608A (en) * 1997-04-07 1998-07-07 Dumaine; Thomas J. Reversible granulator
DE102012110342A1 (de) * 2012-10-29 2014-04-30 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Rotorkörper für eine Zerkleinerungsvorrichtung, insbesondere einen Trommelhacker für die Zerkleinerung von Holz oder dergleichen
US20140319260A1 (en) * 2013-04-29 2014-10-30 Vermeer Manufacturing Company Cutter assembly and adjustable cutter for use in comminuting apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109127027A (zh) * 2018-09-26 2019-01-04 东莞市宏湖智能装备有限公司 一种锂电池撕碎机的制造工艺

Also Published As

Publication number Publication date
EP3235572B1 (fr) 2018-11-28
PL3235572T3 (pl) 2019-05-31

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