EP1260352A1 - Pelletizing machine and method of producing pellets - Google Patents

Pelletizing machine and method of producing pellets Download PDF

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Publication number
EP1260352A1
EP1260352A1 EP02425290A EP02425290A EP1260352A1 EP 1260352 A1 EP1260352 A1 EP 1260352A1 EP 02425290 A EP02425290 A EP 02425290A EP 02425290 A EP02425290 A EP 02425290A EP 1260352 A1 EP1260352 A1 EP 1260352A1
Authority
EP
European Patent Office
Prior art keywords
teeth
holes
machine according
drawplates
drawplate
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Withdrawn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
EP02425290A
Other languages
German (de)
English (en)
French (fr)
Inventor
Fulvio Soldaini
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.)
AVS SLOVAKIA S.R.O.
Original Assignee
Ecotre System Srl
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 Ecotre System Srl filed Critical Ecotre System Srl
Publication of EP1260352A1 publication Critical patent/EP1260352A1/en
Withdrawn legal-status Critical Current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
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/221—Extrusion presses; Dies therefor extrusion dies
    • 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
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/28—Extrusion presses; Dies therefor using perforated rollers or discs

Definitions

  • the present invention refers to a pelletizing machine and method of producing pellets.
  • Pelletizing machines having rotary drawplates.
  • Such drawplates consist of cylindrical hollow bodies meshing between them via respective external toothings.
  • the said cylindrical bodies are provided, in correspondence of the grooves delimited by the respective toothings, with a plurality of through holes able to delimit corresponding radial channels.
  • the material under treatment are forced to pass through said channels by virtue of the compression exerted in the meshing regions of the toothings. In this way, there is obtained the formation of pellets, that is, short cylindrical bars made from the material worked by the drawplates.
  • the main object of the present invention is to overcome the said drawbacks.
  • the present invention makes it possible to reduce the energy consumption inasmuch as the specific power for pelletization, that is, the power required for treating a predetermined amount of material, is less than that required by the conventional machines. It is also possible to arrange the drawplates according to a plurality of operating configurations. Moreover, a machine according to the invention is relatively simple to make and is reliable even after a prolonged service life, and the pellets produced by a machine according to the invention result relatively less brittle and release less dust from their ends.
  • a pelletizing machine comprises at least a drawplate (1) made up of a cylindrical hollow body.
  • the said body (1) is mounted, with the possibility of rotating about its longitudinal axis (x-x), within a stationary structure (2) provided with a housing for each drawplate.
  • the said axis (x-x) is horizontal in the figures 1 and 4A-4D of the attached drawings.
  • the axis of the drawplates is instead vertical in the example of Fig. 8.
  • the outer surface of said body (1) is provided with a toothing to allow the meshing thereof with other bodies (equal to or different from each other, as best described later on) cooperating with the drawplate to achieve the desired effect.
  • the said toothing may consist, as shown by way of example in Fig. 1, of two sets of teeth having helical arrangement, with their axes converging to a central portion (11) lacking of teeth.
  • the said teeth (10) lie also in the central portion of the drawplate (1).
  • the grooves (12) between said teeth (10) exhibit a plurality of through holes (120) lined up along the development of the same grooves (12).
  • the teeth, holes and grooves of said drawplates are represented only partially for the sake of clarity.
  • the toothing of the drawplates may be shaped in any other suitable fashion.
  • the teeth can develop either parallel to the axis of rotation (x-x) of the drawplate or, as shown in Fig. 12, orthogonally to such axis.
  • the teeth of the drawplates may have any suitable profile.
  • the drawplate's teeth have a triangular or substantially so profile.
  • the teeth (10) of body (1) are provided with through holes (100) likewise in correspondence of the grooves (12). Both the teeth (120) of grooves (12) and the holes (100) of teeth (10) are developed radially within the body (1).
  • the said holes (100) exhibit an inlet section (101) flaring toward the outer side (E) of body (1) for the material under treatment.
  • the holes (120) of grooves (12) may exhibit a similar shape in correspondence of the respective inlet sections (121).
  • the said holes (100; 120) may exhibit a first substantially cylindrical length having circular cross-section, which is followed by a second length of substantially frusto-conical shape (102; 122) diverging toward the cavity (C) of body (1).
  • the tapering ratio of said second lengths may be, for example, 1:50, 1:70 or 1:100 where, preferably, the higher ratios are for drawplates working harder materials and the lower ratios for drawplates working softer materials.
  • the second, frusto-conical length allows a slight expansion of the material (MA) leaving the first length and acts as a guide for the same material on its way toward the cavity (C) of body (1). Only in the first part of the travel within the frusto-conical length, owing to said slight expansion, the material tends to interfere with the inner wall of the hole (see Fig. 9). In the remaining part of its travel inside the said frusto-conical length, the material (MA) does not interfere with the wall of the hole, so that no relevant appreciable friction effect takes place.
  • a machine according to the invention may also be advantageously provided with one or more punch rollers (3) whose external surface has teeth (30) able to engage the grooves (12) of at least one drawplate (1).
  • the axis (y-y) of each roller (3) is parallel to that of the drawplates which it is associated with.
  • the teeth (30) of each roller (1) are solid, that is, not drilled, and exhibit a series of portions (31) filleted by concave surfaces which, at the root of each tooth (30), delimit a depression (32) having a predetermined depth.
  • This particular shape of the teeth (30) of rollers (3) is obtainable by using a numerical control machine tool known per se, provided with a cutter allowing the removal of the material at selected points in the root of the teeth.
  • the said portions (31) correspond to holes (120) provided within the grooves (12) of body (1).
  • the teeth (10) of drawplates (1) may also have the said shaping (see Figs. 14-16 in which the said depressions are designated by the reference number 110).
  • the teeth (10) of drawplates (1) may be provided with depressions (111), having advantageously a conical shape with the base facing outwardly, in the space filled with respective head surfaces between each pair of adjacent holes (100).
  • the teeth (30) of rollers (3) may be provided with depressions (33), having advantageously a conical shape with the base facing outwardly, in correspondence of the respective head portions (31). It is believed that the presence of said depressions (111; 33) upon the head surface of teeth (10; 30) of drawplates (1) and, respectively, of rollers (3), will contribute to the formation o more compact pellets, less brittle and less subject to releasing dust from the ends.
  • a pelletizing machine may include two drawplates meshing with each other (Fig. 4A), two drawplates meshing with each other and with two pairs of punch rollers (Fig. 4B) as well, a drawplate associated with more punch rollers (Fig. 4C) or two drawplates meshing with a punch roller interposed there between and, on the opposite side, meshing respectively with two pairs of punch rollers (Fig. 4D).
  • the elements (1; 3) meshing direct with each other are counter-rotating. It will be appreciated that further configurations or combinations of rollers and drawplates may also be adopted.
  • the operation of the machine is as follows.
  • the material to be pelletized is fed from above by gravity (arrow "F"), in correspondence of the region (A) of engagement of the counter-rotating drawplates (1). Because of the compression thus exerted onto the material arriving from said region (A), the same material is forced to transit, by becoming compacted, through the holes (120) of grooves (12) of the two drawplates (1) and through the holes (100) of the respective teeth (10).
  • the thrust on the material under treatment is exerted in the region of instantaneous meshing of the teeth of the two drawplates.
  • each tooth pushes the material toward the groove of the drawplate which, in the same instant, comes opposite thereto and vice versa, so that the material is forced to pass both through the holes provided in the grooves and through the holes provided in the teeth.
  • the compacted material out coming from the outlet sections of holes (120; 100) collects within the cavity (C) of drawplates (1).
  • means may be provided able to reduce the compact material into pieces or "pellets" of suitable length, such as means able to intercept the material (MA) exiting from the holes (100; 120) and causing the breaking thereof at a preset height.
  • Means suited to this purpose are described in EP 846554 previously mentioned.
  • the material to be pelletized is introduced from above, in correspondence of preset points, as indicated by arrows (F).
  • the present machine may also have one or more work fronts.
  • the said structure (2) may be provided with seats for drawplates and/or punch rollers either on one side only or on both sides.
  • Fig. 5 wherein a drawplate (2) is shown matched with two punch rollers (3) in correspondence of two fronts (G, H) of the structure (1).
  • the pinion (40) is engaged with two corresponding opposite crowns (43) with which the coaxial and opposite shafts (44) are associated for driving the drawplates (1) and rollers (3) into motion.
  • the connection between each of said shafts (44), the respective drawplate (1) and respective rollers (3) is carried out by a toothed wheel (45) keyed onto the axis of the drawplate (1) and meshing, on opposite sides, with corresponding toothed wheels (46) each of which is keyed onto the axis of relevant roller (3).
  • the present machine is able to treat materials of different nature, such as biological dehydrated muds, biological and chemical manure, waste materials from industrial plants, pastes and pulps, fodders, combustible fractions of urban solid wastes, compost, paper, paperboard, textile waste, refuse and residuals, wooden shaving, saw dust, plastic materials and materials for pelletization in general.
  • materials of different nature such as biological dehydrated muds, biological and chemical manure, waste materials from industrial plants, pastes and pulps, fodders, combustible fractions of urban solid wastes, compost, paper, paperboard, textile waste, refuse and residuals, wooden shaving, saw dust, plastic materials and materials for pelletization in general.
  • a plant provided with a machine (M) according to the invention is described here below by way of non limiting example.
  • the said plant comprises:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Glanulating (AREA)
EP02425290A 2001-05-14 2002-05-10 Pelletizing machine and method of producing pellets Withdrawn EP1260352A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITFI20010089 ITFI20010089A1 (it) 2001-05-14 2001-05-14 Macchina pellettizzatrice e metodo per la produzione di pellets
ITFI20010089 2001-05-14

Publications (1)

Publication Number Publication Date
EP1260352A1 true EP1260352A1 (en) 2002-11-27

Family

ID=11442193

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02425290A Withdrawn EP1260352A1 (en) 2001-05-14 2002-05-10 Pelletizing machine and method of producing pellets

Country Status (2)

Country Link
EP (1) EP1260352A1 (zh)
IT (1) ITFI20010089A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2931721A1 (fr) * 2008-06-03 2009-12-04 Saveh Arash Honarkar Presse rotative a filieres destinee a la production de granules
WO2010060617A3 (en) * 2008-11-25 2010-07-29 Kerry Biomass Technology Limited A pellet forming system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB382819A (en) * 1932-01-28 1932-11-03 Albert William Sizer Improvements in moulding machines for meal and the like
US2186415A (en) * 1939-08-11 1940-01-09 James P Haworth Pelleting machine
DE4038582A1 (de) * 1990-12-04 1992-06-11 Franz Haimer Vorrichtung zur herstellung von pellets
DE4214111A1 (de) * 1992-04-29 1993-11-04 Franz Haimer Pressvorrichtung
EP0846554A2 (fr) * 1996-12-04 1998-06-10 Ecogest S.r.l. Machine pour le compactage de matériaux solides

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB382819A (en) * 1932-01-28 1932-11-03 Albert William Sizer Improvements in moulding machines for meal and the like
US2186415A (en) * 1939-08-11 1940-01-09 James P Haworth Pelleting machine
DE4038582A1 (de) * 1990-12-04 1992-06-11 Franz Haimer Vorrichtung zur herstellung von pellets
DE4214111A1 (de) * 1992-04-29 1993-11-04 Franz Haimer Pressvorrichtung
EP0846554A2 (fr) * 1996-12-04 1998-06-10 Ecogest S.r.l. Machine pour le compactage de matériaux solides

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2931721A1 (fr) * 2008-06-03 2009-12-04 Saveh Arash Honarkar Presse rotative a filieres destinee a la production de granules
WO2010060617A3 (en) * 2008-11-25 2010-07-29 Kerry Biomass Technology Limited A pellet forming system
EP2383032A1 (en) * 2008-11-25 2011-11-02 Kerry Biomass Technology Limited A pellet forming system

Also Published As

Publication number Publication date
ITFI20010089A1 (it) 2002-11-14

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