EP0956943A1 - Presse à granuler - Google Patents

Presse à granuler Download PDF

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Publication number
EP0956943A1
EP0956943A1 EP98201551A EP98201551A EP0956943A1 EP 0956943 A1 EP0956943 A1 EP 0956943A1 EP 98201551 A EP98201551 A EP 98201551A EP 98201551 A EP98201551 A EP 98201551A EP 0956943 A1 EP0956943 A1 EP 0956943A1
Authority
EP
European Patent Office
Prior art keywords
die member
die
axis
pellet mill
shafts
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Withdrawn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
EP98201551A
Other languages
German (de)
English (en)
Inventor
Johannes Albartus Vink
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.)
Consolidated Process Machinery Inc
Original Assignee
Consolidated Process Machinery Inc
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 Consolidated Process Machinery Inc filed Critical Consolidated Process Machinery Inc
Priority to EP98201551A priority Critical patent/EP0956943A1/fr
Publication of EP0956943A1 publication Critical patent/EP0956943A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/20—Roller-and-ring machines, i.e. with roller disposed within a ring and co-operating with the inner surface of the ring
    • B30B11/201—Roller-and-ring machines, i.e. with roller disposed within a ring and co-operating with the inner surface of the ring for extruding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/20—Roller-and-ring machines, i.e. with roller disposed within a ring and co-operating with the inner surface of the ring
    • B30B11/201—Roller-and-ring machines, i.e. with roller disposed within a ring and co-operating with the inner surface of the ring for extruding material
    • B30B11/208—Roller constructions; Mounting of the rollers

Definitions

  • the invention relates to a pellet mill, comprising a cylindrical die member with die passages therethrough and having an axis of symmetry, a plurality of die-rollers located within said die member, each mounted on a shaft for rotation about a respective axis of rotation, said shafts extending in parallel with and spaced from said axis of symmetry, and further comprising drive means for generating a rotational movement of said shafts about said axis of symmetry and relative to said die member.
  • the die member rotates about the axis of symmetry relative to the die-rollers, of which the axes of rotation are stationary.
  • the rotation of the die-rollers about their respective axes of rotation depends upon the tangential force applied via the layer of product to be pelleted between the outer circumference of the die-rollers and the inner circumference of the die member. For a proper operation of the pellet mill a rotation of the die-rollers is required.
  • the tangential force applied via the layer of product and driving the die-rollers depends on many factors. such as the distance between the die-rollers and die member, wear of the components, variations of the composition of the product, temperature variations, feed rate of the product to be pelleted, wherin not all of these factors may be controlled during the pelleting operation. In practice this often leads to a defective tangential force, also referred to as "choke ups", requiring cleaning, re-adjusting and re-starting procedures. Further some compositions may result in firmer pellets with a larger gap between die-rollers and die member, increasing the risk of choke up. The same applies when pre-conditioning the fed product in expanders from which the product reaches the pellet mill with high levels of moisture and with increased temperature.
  • a pellet mill comprising a cylindrical die member with die passages therethrough and having an axis of symmetry, a plurality of die-rollers located within said die member, each mounted on a shaft for rotation about a respective axis of rotation, said shafts extending in parallel with and spaced from said axis of symmetry, and further comprising drive means for generating a rotational movement of said shafts about said axis of symmetry and relative to said die member, characterised in that each die-roller is fixedly attached to its respective shaft and that each shaft is rotatably mounted for rotation about the respective axis of rotation by means of additional drive means.
  • the pellet mill according to the invention yields excellent results while compacting powdery materials into pellets.
  • the additional drive means rotate the die-rollers via the rotatably mounted shafts. Thus the rotation of the die-rollers no longer depends on tangential forces applied via the layer of product.
  • the additional drive means optionally in combination with a regulation of the drive means causing the rotational movement of said shafts relative to the die member, the obtained pellets may be optimised and the results are far less dependent on the factors mentioned before.
  • the drive means and additional drive means preferably may be regulated both, and this may occur independently. However, in certain cases it suffices, when the drive means and additional drive means are synchronised.
  • the drive means and additional drive means comprise toothpulleys attached to said die member and to said shafts cooperating with toothed belts driven by motors.
  • the toothed belts all may be driven by one single common intermediate shaft provided with a toothed gear.
  • other drive means and additional drive means are conceivable, such as V-belts with corresponding pulleys.
  • the operating range of the pellet mill according to the invention may further be increased, when the bearings are adjustable such as to set the distance between the outer circumference of the die-rollers and the inner circumference of the die member.
  • the bearings are carried by pivot arms which are drivable through driving mechanisms. While adjusting the position of the bearings, and thus of the shafts supporting the die-rollers, the shafts follow limited curved tracks.
  • the openings in the end walls limiting the die member cavity should have corresponding shapes for allowing such an adjustment.
  • the driving means each comprise an assembly of worm gears driving plungers connected with the pivot arms.
  • Such an assembly per se is known to experts in this field, and thus does not need any further explanation.
  • the die member at one of its ends is prolonged beyond the respective end wall and wherein said end wall is part of a cylindrical body positioned concentrically within the die member prolongation, a compact constructive solution for the pellet mill is provided.
  • the inventive concept offers excellent results when the die member axis of symmetry extends horizontally. This means, that the pellet mill is of the type with vertically arranged die member.
  • part of a pellet mill comprising a cylindrical die member 1 with die passages 2 therethrough.
  • the pellet mill is of the type with vertically arranged die member 1.
  • the cylindrical die member has an axis of symmetry 31 extending horizontally.
  • a hollow cylindrical prolongation 3 is, by means not shown further, connected to one of the ends of the die member 1.
  • the prolongation 3 is located and rotatable in bearings 4 which further are connected with the structural body 5 of the pellet mill.
  • the prolongation 3 carries at its circumference a toothpulley 6 cooperating with a toothed belt 7.
  • the toothed belt 7 is driven by drive means not shown in detail (for example an electric motor).
  • bearings 4 may be provided with seals known per se for preventing the entrance of dirt.
  • a cylindrical body 8 is positioned which at its rear side (at the right in fig. 1) is connected to the structural body 5, and which at its forward side ends in an end wall 9 limiting the die member cavity 10. Not shown are bearings interpositioned between the outer circumference of the cylindrical body 8 and the inner circumference of the prolongation 3.
  • the die member cavity 10 is at its side opposite the end wall 9 limited by another end wall 11. Not shown are provisions for ensuring that products to be pelleted can be fed into the die member cavity 10.
  • the end walls 9, 11 and cylindrical body 8 are structurally connected by means of a number of connecting rods 12, of which only one is represented.
  • each of the end walls 9 and 11 openings 30, illustrated in dotted lines in fig. 2, are provided through which shafts 14 and 15 (fig. 2) extend.
  • Said shafts 14 and 15 are positioned at 180° opposite each other (fig. 2).
  • the shafts 14 and 15 extend beyond the cylindrical body 8 and each carry a toothpulley 16 cooperating with a toothed belt 17.
  • said toothed belt 17 is driven by a drive means, such as an electric motor.
  • each shaft 14 and 15 Fixedly attached to each shaft 14 and 15 are die-rollers 18 and 19.
  • driving the shafts 14 and 15 by means of the toothed belts 17 will lead to a rotation of the die-rollers 18 and 19 about respective axes of rotation 20 coinciding with the centre line of the shafts 14 and 15.
  • Each shaft 14 and 15 is near to its opposite ends journalled in pivot arms 21 and 22 pivoting about pivots 23 and 24 respectively.
  • the free ends of the pivot arms 21 and 22 are engaged by plungers 25, 26 driven by an assembly of worm gears 27 only shown schematically and driven by a driven shaft 28 extending between and beyond the end walls 9, 11.
  • the driven shaft 28 is driven by a drive means, such as an electric motor 29 or alike.
  • the plungers 25 and 26 adjust the position of the pivot arms 21 and 22, and thus the position of the shafts 14 and 15 together with the die-rollers 18 and 19.
  • the distance between the outer circumference of the die-rollers 18 and 19 and the inner circumference of the die member 1 can be adjusted.
  • the openings 30 in the end walls 9 and 11 are correspondingly shaped in a curved manner.
  • Appropriate sealing devices may be provided.
  • the prolongation 3, and therefor the die member 1 is driven by means of the toothed belt 7 and toothpulley 6. Further the die-rollers 18 and 19 are driven by means of the toothed belts 17 and toothpulleys 16.
  • the drive means driving the toothed belts 7 and 17 may or may not be synchronised.
  • By means of the driven shaft 28 and assembly of worm gears 27 it is possible to adjust the position of the die-rollers 18 and 19 during the operation of the pellet mill.
  • tensioning devices for the toothed belts 17 should be provided. Further it may be preferred to provide slip couplings for disengaging the drive means in case of a sudden overload.
  • the die member 1 is rotating relative to the structural body 5, whereas the cylindrical body 8 with components attached thereto is stationary it will be immediately clear to an expert, that also the die member 1 may be stationary, whereas the cylindrical body 8 with components attached thereto may be rotating relative to the structural body 5. This does not change the inventive concept.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP98201551A 1998-05-12 1998-05-12 Presse à granuler Withdrawn EP0956943A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98201551A EP0956943A1 (fr) 1998-05-12 1998-05-12 Presse à granuler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98201551A EP0956943A1 (fr) 1998-05-12 1998-05-12 Presse à granuler

Publications (1)

Publication Number Publication Date
EP0956943A1 true EP0956943A1 (fr) 1999-11-17

Family

ID=8233711

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98201551A Withdrawn EP0956943A1 (fr) 1998-05-12 1998-05-12 Presse à granuler

Country Status (1)

Country Link
EP (1) EP0956943A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004022324A1 (fr) * 2002-09-03 2004-03-18 Bühler AG Presse a cuber
WO2007051325A1 (fr) * 2005-10-31 2007-05-10 Bühler AG Presse a pellets

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB989603A (en) * 1963-09-30 1965-04-22 Muhlenbau Dresden Veb Pressure-application device
GB2130959A (en) * 1982-11-05 1984-06-13 Ru Korrel Pty Ltd Pelletising briquetting by compaction
WO1991002644A1 (fr) * 1989-08-21 1991-03-07 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno Pastilleuse
EP0694380A1 (fr) * 1994-07-26 1996-01-31 Salzhausener Maschinenbautechnik SALMATEC GmbH Procédé de traitement d'un matériau agglomérable

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB989603A (en) * 1963-09-30 1965-04-22 Muhlenbau Dresden Veb Pressure-application device
GB2130959A (en) * 1982-11-05 1984-06-13 Ru Korrel Pty Ltd Pelletising briquetting by compaction
WO1991002644A1 (fr) * 1989-08-21 1991-03-07 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno Pastilleuse
EP0694380A1 (fr) * 1994-07-26 1996-01-31 Salzhausener Maschinenbautechnik SALMATEC GmbH Procédé de traitement d'un matériau agglomérable

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004022324A1 (fr) * 2002-09-03 2004-03-18 Bühler AG Presse a cuber
US7241127B2 (en) 2002-09-03 2007-07-10 Bühler AG Pelleting press
CN1330478C (zh) * 2002-09-03 2007-08-08 布勒公司 制粒机
WO2007051325A1 (fr) * 2005-10-31 2007-05-10 Bühler AG Presse a pellets

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