EP1619012B1 - Pellet machine with oleodynamic control extruder group - Google Patents

Pellet machine with oleodynamic control extruder group Download PDF

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Publication number
EP1619012B1
EP1619012B1 EP05425162A EP05425162A EP1619012B1 EP 1619012 B1 EP1619012 B1 EP 1619012B1 EP 05425162 A EP05425162 A EP 05425162A EP 05425162 A EP05425162 A EP 05425162A EP 1619012 B1 EP1619012 B1 EP 1619012B1
Authority
EP
European Patent Office
Prior art keywords
extruder
pressure roller
oleodynamic
pellet machine
machine according
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.)
Expired - Lifetime
Application number
EP05425162A
Other languages
German (de)
French (fr)
Other versions
EP1619012A3 (en
EP1619012A2 (en
Inventor
Michele Vitale
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.)
P System Srl
Original Assignee
P System Srl
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Publication date
Application filed by P System Srl filed Critical P System Srl
Priority to PL05425162T priority Critical patent/PL1619012T3/en
Publication of EP1619012A2 publication Critical patent/EP1619012A2/en
Publication of EP1619012A3 publication Critical patent/EP1619012A3/en
Application granted granted Critical
Publication of EP1619012B1 publication Critical patent/EP1619012B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B30B11/208—Roller constructions; Mounting of the rollers

Definitions

  • This invention concerns vertical, cylindrical extruder pellet machines in general with internal pressure rollers, and refers in particular to an extruder group for such machines.
  • the machines taken into consideration here and used for pelletising wood usually include a rotating annular extruder, having a large number of radial holes and pressing rollers, also turning, positioned and operating at a tangent to the inner surface of the perforated extruder.
  • the starting raw material to be made into pellets is forwarded and crushed between the pressure rollers and the inner surface of the extruder and forced, in this way, to be extruded through the holes in the die.
  • the pressure rollers are usually knurled to increase the crushing action on the material to be extruded and to prevent the latter from slipping out of the pressure area.
  • the resulting extruded material is sheared by means of fixed blades operating on the external surface of the extruder to form the pellets.
  • EP-A-0371519 discloses a wood pellet machine according to the preamble of claim 1, comprising a treatment chamber, a rotating annular extruder turning in said chamber and provided with a plurality of radial holes, and rotating pressure rollers, positioned and operating at a tangent to the internal surface of the perforated extruder.
  • a pressure roller is associated with the extruder and can be positioned radially to the Internal surface of the extruder by means of an oleodynamic actuator fixed to the housing defining the treatment chamber.
  • DE 3813081 discloses a wood pellet machine provided with a die, which itself is provided with bores, and a pan grinder head with pan grinder rollers which roll on the die.
  • a hydraulic device is connected to a pump for pressing the pan grinder rollers towards the die.
  • a volumetric device is provided to control the flowing of the hydraulic fluid thereby permitting the distance between the pan grinder rollers and the die to be measured and controlled or regulated.
  • JP 2002283346 discloses a wood pellet machine wherein the temperature of the die and the rollers is measured to feedback control the operation of the machine with respect to the adjustment of the distance between the rollers and the die.
  • the object of this invention is to resolve the problems of the pellet machines of the known technique, by providing a simplified and effective design.
  • the advantage of the above is that the pellet machine with cylindrical extrusion is simpler, less cumbersome and not as noisy and can be easily adjusted to the pressure of the extrusion of the initial material so as to optimise on the machine operating capacity and productivity.
  • the pressure roller can also be set up for axial positioning, which offers the possibility of using an extruder on the same pellet machining with at least two work sessions and usable alternatively, depending on the material to be pelletised, by simply moving the pressure roller from one work section to another.
  • FIG. 10 indicates generically the casing of a pellet machine supporting a annular extruder 11, that is cylindrical, at a horizontal axis, to which a pressure roller 12 is actively associated.
  • the extruder 11 is supported by two rings or flanges 13 and turns powered preferably by an oleodynamic motor 14. As is known, the extruder 11 is equipped with numerous radial holes - not shown - for extruding the initial material and is housed and operates in a chamber formed by the casing 10 and closed at the front by a door 15.
  • the pressure roller 12 is coordinated and interacts with the internal surface of the annular extruder 11 where the material to be pelletised arrives from an external source.
  • Said roller has a knurled peripheral surface 16 and is assembled, by the use of a bearing 17, on a relative shaft 18 parallel to the rotation axis of the extruder 11.
  • the shaft 18 of the pressure roller 12 is supported by a support 19 integrated with a piston 20 that is housed and slides in a corresponding oleodynamic cylinder 21 fixed to the door 15.
  • the piston and relative cylinder are oriented radially to the shaft 18 of the pressure roller 12, and when said roller is associated with the extruder 11 it is inside the extruder itself. Thanks to this type of assembly, the pressure roller 12 can be positioned radially to the internal surface of the extruder, approaching or moving away from it according to needs, simply by means of an external activation command of the oleodynamic cylinder.
  • the material to be pelletised is conveyed from the outside to the inside of the extruder, between the surface of the latter and the pressure roller, where an action is developed that pushes the material through the holes of the extruder, extruding it to form pellets.
  • the pressure roller 12 with its connected radial oleodynamic positioning system 20, 21 can be assembled on a guided plate parallel to the roller axis and moved by at least one cylinder 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Description

    Field of the Invention
  • This invention concerns vertical, cylindrical extruder pellet machines in general with internal pressure rollers, and refers in particular to an extruder group for such machines.
    • State of the Technique
  • The machines taken into consideration here and used for pelletising wood, usually include a rotating annular extruder, having a large number of radial holes and pressing rollers, also turning, positioned and operating at a tangent to the inner surface of the perforated extruder.
  • The starting raw material to be made into pellets is forwarded and crushed between the pressure rollers and the inner surface of the extruder and forced, in this way, to be extruded through the holes in the die. The pressure rollers are usually knurled to increase the crushing action on the material to be extruded and to prevent the latter from slipping out of the pressure area. The resulting extruded material is sheared by means of fixed blades operating on the external surface of the extruder to form the pellets.
  • In the known pellet machines, the rotation of the extruder is powered by an external motor unit using a belt or pulley drive, which besides being extremely cumbersome is also noisy. Furthermore, there are two or more pressure rollers and adjustment of their position with reference to the extruder is always a problem.
  • EP-A-0371519 discloses a wood pellet machine according to the preamble of claim 1, comprising a treatment chamber, a rotating annular extruder turning in said chamber and provided with a plurality of radial holes, and rotating pressure rollers, positioned and operating at a tangent to the internal surface of the perforated extruder. A pressure roller is associated with the extruder and can be positioned radially to the Internal surface of the extruder by means of an oleodynamic actuator fixed to the housing defining the treatment chamber.
  • DE 3813081 discloses a wood pellet machine provided with a die, which itself is provided with bores, and a pan grinder head with pan grinder rollers which roll on the die. A hydraulic device is connected to a pump for pressing the pan grinder rollers towards the die. A volumetric device is provided to control the flowing of the hydraulic fluid thereby permitting the distance between the pan grinder rollers and the die to be measured and controlled or regulated.
  • JP 2002283346 discloses a wood pellet machine wherein the temperature of the die and the rollers is measured to feedback control the operation of the machine with respect to the adjustment of the distance between the rollers and the die.
  • SU 709386 discloses another prior art machine.
    • Object of the Invention
  • The object of this invention is to resolve the problems of the pellet machines of the known technique, by providing a simplified and effective design.
  • The advantage of the above is that the pellet machine with cylindrical extrusion is simpler, less cumbersome and not as noisy and can be easily adjusted to the pressure of the extrusion of the initial material so as to optimise on the machine operating capacity and productivity.
  • Furthermore, the pressure roller can also be set up for axial positioning, which offers the possibility of using an extruder on the same pellet machining with at least two work sessions and usable alternatively, depending on the material to be pelletised, by simply moving the pressure roller from one work section to another.
  • The object and the advantages mentioned above are achieved, in compliance with the invention, using an improved wood pellet machine according to at least claim 1.
    • Brief description of the drawings
  • The invention will however become more evident in the continuation of this description made in reference to the enclosed exemplifying drawings, in which:
    • Fig.1 is a schematic lateral view of the extruder group; and
    • Fig. 2 is a front view of the extruder-pressure roller connection.
    Detailed Description of the Invention
  • In said drawing 10 indicates generically the casing of a pellet machine supporting a annular extruder 11, that is cylindrical, at a horizontal axis, to which a pressure roller 12 is actively associated.
  • The extruder 11 is supported by two rings or flanges 13 and turns powered preferably by an oleodynamic motor 14. As is known, the extruder 11 is equipped with numerous radial holes - not shown - for extruding the initial material and is housed and operates in a chamber formed by the casing 10 and closed at the front by a door 15.
  • The pressure roller 12 is coordinated and interacts with the internal surface of the annular extruder 11 where the material to be pelletised arrives from an external source. Said roller has a knurled peripheral surface 16 and is assembled, by the use of a bearing 17, on a relative shaft 18 parallel to the rotation axis of the extruder 11.
  • The shaft 18 of the pressure roller 12 is supported by a support 19 integrated with a piston 20 that is housed and slides in a corresponding oleodynamic cylinder 21 fixed to the door 15. The piston and relative cylinder are oriented radially to the shaft 18 of the pressure roller 12, and when said roller is associated with the extruder 11 it is inside the extruder itself. Thanks to this type of assembly, the pressure roller 12 can be positioned radially to the internal surface of the extruder, approaching or moving away from it according to needs, simply by means of an external activation command of the oleodynamic cylinder.
  • The material to be pelletised is conveyed from the outside to the inside of the extruder, between the surface of the latter and the pressure roller, where an action is developed that pushes the material through the holes of the extruder, extruding it to form pellets.
  • In addition, the pressure roller 12 with its connected radial oleodynamic positioning system 20, 21 can be assembled on a guided plate parallel to the roller axis and moved by at least one cylinder 22. In this way and as stated above, it will be possible to set up an extruder with at least two parallel, side by side, work sections, and use one or the other work section by axially moving the pressure roller from one work section to the other.
  • Worthy of mention is the fact that the supply of the material to the extruder of the machine is achieved by screw feed driven by a device with auto-adjusted rotating speed by an electronic and oleodynamic retroaction (Load-Sensing) and that the extruder can be associated with an automatic cleaning and lubricating system by an electro-oleodynamic control (Easy-Start).

Claims (5)

  1. A wood pellet machine, comprising a treatment chamber, a rotating annular extruder (11) turning in said chamber and provided with radial holes, and rotating pressure rollers (12) positioned and operating at a tangent to the internal surface of the perforated extruder (11), wherein said annular extruder (11) is associated with a pressure roller (12) supported by a movable support and which is able to be positioned radially to the internal surface of the extruder (11) by means of an oleodynamic actuator (20, 21), wherein the pressure roller (12) has a shaft (18) parallel to the rotating axis of the extruder (11), and wherein said shaft (18) is supported by a support (19) integrated with a piston (20) housed and sliding in an oleodynamic cylinder (21), characterized in that said oleodynamic cylinder (21) is fixed to a closing door (15) of the treatment chamber, said piston (20) and relative cylinder (21) being radially oriented to the shaft (18) of said pressure roller (12).
  2. Pellet machine according to claim 1, wherein the extruder (11) has two different work sections placed side by side and wherein said pressure roller (12) is able to be moved and positioned axially in correlation with one or the other of said work sections of the extruder (11).
  3. Pellet machine according to claim 2, wherein, for its axial positioning, said pressure roller (12) is assembled on a means of support (19) movable by means of at least one oleodynamic cylinder (21).
  4. Pellet machine according to any of the previous claims, wherein the rotating annular extruder (11) is driven by an oleodynamic motor (14).
  5. Pellet machine according to any of the previous claims, wherein said pressure roller (12) is associated with said extruder (11) and is able to be moved and positioned both radially and axially to the internal surface of the extruder (11) by means of a remote controlled oleodynamic actuator.
EP05425162A 2004-07-21 2005-03-21 Pellet machine with oleodynamic control extruder group Expired - Lifetime EP1619012B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05425162T PL1619012T3 (en) 2004-07-21 2005-03-21 Pellet machine with oleodynamic control extruder group

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000086A ITBS20040086A1 (en) 2004-07-21 2004-07-21 PELLETTING MACHINE WITH HYDRAULIC CONTROL DRAWING UNIT

Publications (3)

Publication Number Publication Date
EP1619012A2 EP1619012A2 (en) 2006-01-25
EP1619012A3 EP1619012A3 (en) 2008-02-27
EP1619012B1 true EP1619012B1 (en) 2012-09-05

Family

ID=34980095

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05425162A Expired - Lifetime EP1619012B1 (en) 2004-07-21 2005-03-21 Pellet machine with oleodynamic control extruder group

Country Status (4)

Country Link
EP (1) EP1619012B1 (en)
ES (1) ES2392435T3 (en)
IT (1) ITBS20040086A1 (en)
PL (1) PL1619012T3 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU709386A1 (en) * 1977-01-26 1980-01-18 Приморский научно-исследовательский институт сельского хозяйства Granulating press
DE3775423D1 (en) * 1986-01-24 1992-02-06 Buehler Ag Wuerfelpresse.
DE3813081A1 (en) * 1988-04-19 1989-11-02 Kahl Amandus Maschf Pan grinder press with a hydraulic device
JP2002283346A (en) * 2001-03-23 2002-10-03 Nkk Corp Waste plastic granulator

Also Published As

Publication number Publication date
EP1619012A3 (en) 2008-02-27
ES2392435T3 (en) 2012-12-10
EP1619012A2 (en) 2006-01-25
ITBS20040086A1 (en) 2004-10-21
PL1619012T3 (en) 2013-01-31

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