EP3983142B1 - Selector roller - Google Patents

Selector roller Download PDF

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Publication number
EP3983142B1
EP3983142B1 EP20771761.2A EP20771761A EP3983142B1 EP 3983142 B1 EP3983142 B1 EP 3983142B1 EP 20771761 A EP20771761 A EP 20771761A EP 3983142 B1 EP3983142 B1 EP 3983142B1
Authority
EP
European Patent Office
Prior art keywords
rollers
roller
selector
section
trapezoidal
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.)
Active
Application number
EP20771761.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3983142A1 (en
EP3983142C0 (en
Inventor
Romeo Paladin
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.)
Lignum Technologies AG
Original Assignee
Lignum Technologies AG
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 Lignum Technologies AG filed Critical Lignum Technologies AG
Priority to RS20250095A priority Critical patent/RS66472B1/sr
Priority to HRP20250124TT priority patent/HRP20250124T1/hr
Publication of EP3983142A1 publication Critical patent/EP3983142A1/en
Application granted granted Critical
Publication of EP3983142B1 publication Critical patent/EP3983142B1/en
Publication of EP3983142C0 publication Critical patent/EP3983142C0/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/12—Apparatus having only parallel elements
    • B07B1/14—Roller screens
    • B07B1/15—Roller screens using corrugated, grooved or ribbed rollers

Definitions

  • the present invention concerns selector rollers to select chips of wood material, or material similar to wood material or suchlike, as well as for humus, earth, inert materials in general.
  • the present invention concerns perfected selector rollers, as well as selector machines that use said rollers.
  • rollers of the present invention can be both keyed onto a shaft equipped with motion and, therefore, also individually replaceable, and also obtained integrally with the shaft itself.
  • the rollers are installed staggered on parallel shafts to constitute a non-linear path.
  • chipboard panels we mean those panels, consisting of wood shavings, bonded by suitable glues, and normally hot pressed.
  • Such panels can be characterized by a single-layer structure, by a multi-layer structure, or by a structure defined as "with continuous variable grain size", or other type.
  • the shavings are generically obtained from a heterogeneous mass of chips which are selected in various fractions, each of which is treated (clean, refined, etc.) to obtain suitable quality shavings.
  • a fundamental element that determines the quality of the panels is the "workability" of the panel itself, and this parameter is related to the duration of the cutting tools and abrasive belts used.
  • the systems for removing contaminants from the chips of recycled wood are complex and normally provide, at the beginning of the cleaning cycle, roller-type screens to divide the incoherent mass into various homogeneous fractions.
  • each of the fractions is then advantageously cleaned with suitable specialized systems to treat the specific grain sizes of each fraction.
  • EP1007227B1 discloses a selector roller provided with a circumferential protrusion, wherein the circumferential protrusion is provided with an apical annular surface, wherein on opposite sides of the circumferential protrusion there are indentations protruding with respect to said opposite sides.
  • Non-optimal results affect the quality and qualification of the final product.
  • the quality of a panel is not only defined by the presence of impurities but also by the quality of the chips used.
  • This roller not only allows an excellent selection of the usual chips, but this result is also obtained with thin chips and/or wood material or not and/or with materials such as humus, earth or inert materials in general.
  • Applicant has studied a roller suitable to solve the problems caused by thin or inconsistent chips, provided that specific previously unknown dimensional ranges are adapted.
  • roller improved and modified as indicated below, to solve the problem of chip selection very well, with the wide range of problems that they have.
  • Another purpose of the present invention is to improve the powerful selection capacity of any selector machine with rollers positioned on adjacent axes and facing each other, either separated or not, of the type identified above, as well as similar and comparable rollers.
  • Another purpose of the present invention is to provide rollers that allow to optimize the selection process in terms of time, cost and energy.
  • the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
  • a roller to select chips of wood material or suchlike, humus, soil, inert materials or comparable materials has two annular lateral shoulders and a circumferential protrusion contiguous to the lateral shoulders.
  • the circumferential protrusion has a trapezoidal cross-section defined by a smaller side, a larger side, parallel and opposite to the smaller side, and two opposite sides joining together the smaller side and the larger side.
  • the trapezoidal cross-section can be an isosceles, or scalene, or again rectangular trapezoid with one of either the opposite sides substantially orthogonal to the larger and smaller sides.
  • the roller allows an excellent selection not only of the usual materials but also, and above all, of the thin chips of wood or non-wood material and of other types of materials as listed above, guaranteeing optimal results for the final product in terms of quality and optimizing the selection process in terms of time, cost and energy.
  • the Applicant Based on the diameter of the lateral shoulder, that is, of the circumferential base of the roller from which the circumferential protrusion starts, the Applicant has identified precise reference measures to increase the capacity to select the chips and, therefore, the quality of the material selected for the final product.
  • the height of the trapezoidal section that is, the distance between the larger side and the smaller side, is between 0.025 and 0.05 times the diameter of the lateral shoulder.
  • the height of the trapezoidal section is between 0.025 and 0.05 times the diameter of the lateral shoulder.
  • the diameter of the lateral shoulder is between 0.03 and 0.04.
  • the invention also provides that preferably the larger side of the trapezoidal section ranges from 0.07 to 0.12 times the diameter as above, advantageously between 0.09 and 0.10.
  • the smaller side of the trapezoidal section ranges from 0.012 to 0.03 times the diameter as above, advantageously between 0.02 and 0.025
  • the height of the trapezoidal section is comprised between 2.5 cm and 5 cm, preferably between 3 cm and 4 cm.
  • the circumferential protrusion is provided with an apical circumferential surface on which substantially symmetrical teeth are disposed.
  • Such teeth promote a rapid selection of the wood material by arranging the latter into the position suitable to pass this selection step.
  • the teeth do not have a symmetrical shape.
  • the dissymmetry can be in phase analogy or in phase contrast with the rotation according to the type and sizes of the material to select.
  • the symmetrical teeth are disposed sequentially in a regular manner along the circumferential protrusion.
  • the symmetrical teeth are disposed sequentially, alternating with non-symmetrical teeth along the circumferential protrusion.
  • the opposite side or sides have indentations that can occupy the whole side, or reach the base of the indentations, or affect one part of the side free of the teeth, until possibly reaching the apical circumferential surface. This being dependent on the physical and/or morphological characteristics of the chips.
  • Such indentations cooperate with the teeth as above during the rotation of the selector rollers to obtain a more powerful and rapid selection of the material to be selected, optimizing the selection process in terms of time and energy and, therefore, cost.
  • a machine to select chips of wood material or suchlike, humus, soil, inert materials or comparable materials comprises at least two parallel shafts.
  • Each shaft comprises one or more rollers, as described above, disposed interspersed and cooperating with rollers present on the opposite parallel shaft.
  • rollers as above have respective circumferential protrusions and lateral shoulders disposed in such a way that the circumferential protrusions of one shaft are facing in correspondence with the shoulders of the other adjacent shaft and vice versa.
  • circumferential protrusions and lateral shoulders of opposite rollers cooperate with each other to define a passage gap for material of desired sizes, increasing the selection capacity of the selector machine and consequently its efficiency.
  • desired sizes are coherent with the sizes of the gap.
  • Embodiments of the present invention are described here with reference to figs. from 1 to 5 attached and concern selector rollers 10, hereafter also referred to as "rollers”, suitable to select shavings and flakes of fibrous material, advantageously wood, but not only, but also of humus, soil and other comparable materials in order to divide them on the basis of sizes and granulometries.
  • rollers hereafter also referred to as "rollers”
  • chips encompasses all the possible variants mentioned of materials to be selected.
  • the rollers 10 have an annular shape, which develops around a central axis X, defining the axis of rotation.
  • rollers 10 are suitable to be keyed onto a shaft 16, for example a drive shaft.
  • the rollers can be obtained in a single body with the shaft 16.
  • the rollers 10 can be obtained by knurling on a shaft 16 that is axially symmetric to the central axis X.
  • fig. 1 shows two facing shafts 16, 16' which carry a plurality of selector rollers 10.
  • the selector rollers 10 are disposed aligned side by side coaxially along each shaft 16, 16' defining a selector profile.
  • a selector machine there are supplied parallel arrays of rollers 10 which are associated with respective shafts 16, 16', the series of rollers 10 present on one shaft 16 cooperating with a series of rollers 10 present on another shaft 16' parallel to the first.
  • rollers 10 on one shaft 16 these may or may not be interspersed with rollers 10 present on the parallel shaft 16'.
  • the shafts 16, 16' can be provided, for example alternatively, lying on parallel planes.
  • Such variant is suitable to exert a greater action of selection or transport of the material located on the rollers 10.
  • a passage gap 20 is left which is suitable to select the material to be screened, for example thin chips, with an elongated or small size.
  • the plurality of selector rollers 10 side by side on one shaft 16 defines a selector profile mating with the selector profile defined by another plurality of selector rollers 10 side by side on the adjacent shaft 16', said profiles being distanced by a distance equal to the passage gap 20.
  • the passage gap 20 is advantageously, but not necessarily, uniform in accordance with the size and type of the material to be screened.
  • the rollers 10 according to the invention have a truncated cone annular conformation defined by a circumferential protrusion 21 that has a trapezoidal diametrical section 11 ( fig.3 ).
  • diametrical section we mean the section along a plane transverse and parallel to the oblong development of the shaft 16 and containing the axis X.
  • these variants of the trapezoidal section 11 are also applicable to rollers 10 made in a single body with the shaft 16.
  • fig. 3 shows side by side, for illustrative and descriptive clarity and by way of example only, two possible alternative variants of a roller 10 with a trapezoidal section 11 in which one variant provides the roller 10 keyed onto a shaft 16 (indicated as A in fig. 3 ) and the other variant provides the roller 10 made in a single body with the shaft 16 (indicated as B in fig. 3 ). It is not excluded that these variants can also be made with rollers 10 with trapezoidal sections 11 such as those shown in figs. 4-5 .
  • the trapezoidal section 11 is defined by a smaller side 12, a larger side 13, parallel and opposite the smaller side 12, and two opposite sides 14 joining together the smaller side 12 and the larger side 13.
  • the size of the smaller side 12 is smaller than the larger side 13.
  • the opposite sides 14 can be oblong, equal, differentiated, or at least one orthogonal to the smaller 12 and larger 13 sides.
  • the trapezoidal section 11 can be an isosceles ( fig.3 ), rectangle ( fig.4 ) or scalene ( fig.5 ) trapezoid.
  • the circumferential protrusion 21 is provided with an apical annular surface 22 defined by the circumferential succession of the smaller sides 12.
  • the rollers 10 can have, or not have, circumferential selector throats on the sides of the circumferential protrusion 21 and/or at the base of the latter.
  • the roller 10 also has in the axial endings of two lateral shoulders 15 suitable to cooperate, during use, with respective lateral shoulders 15 of side by side rollers 10 keyed onto the same shaft 16.
  • Such lateral shoulders 15 are disposed laterally and contiguously to the circumferential protrusion 21 and can be made in a single body with the latter so as to guarantee a longer useful life for the roller 10.
  • the circumferential protrusion 21 can be knurled, or obtained by means of a machine tool for knurling starting from the shaft 16.
  • the lateral shoulders 15 can be made in a single body with the shaft 16.
  • Such lateral shoulders 15 are cylindrical.
  • the facing lateral shoulders 15, in accordance with the type of heavy contaminants to be eliminated, can be flat cylindrical, conical, or determine a throat connected to the base of the circumferential protrusion 21.
  • the larger side 13 of the trapezoidal section 11 is in line with the upper surface of the lateral shoulders 15.
  • the height of the trapezoidal section 11, that is, the distance between the smaller side 12 and the larger side 13, will be coherent with obtaining an equal or differentiated continuous passage gap 20 between the smaller side 12, the lateral shoulder 15 and the opposite sides 14 in accordance with the type of selection to be obtained.
  • This conformation allows to obtain on the plane that contains all the axes X, X' of the shafts 16, 16' a slit or passage gap 20 with a zigzag shape that has desired characteristics.
  • the lateral shoulders 15 can also be variously shaped and possibly provide ridges or hollows to facilitate the discharge of impurities or heavy contaminants.
  • the perimeter conformation of the apical annular surface 22 is determined by the drawing action that has to be exerted on the chips, shavings and on the heavy contaminants.
  • the apical annular surface 22 advantageously has teeth 18, uniform and balanced with respect to the radius, configured to actuate the desired selection of the chips, facilitating the advancing and drawing action thereof between facing rollers 10 alternated on contiguous shafts 16, 16'. Such action is further facilitated by the trapezoidal section 11 which allows to accompany the material to be screened in the desired direction and in the correct position.
  • the teeth 18 are provided with two bases 24 made inside the circumferential protrusion 21, with an apical portion coinciding with a portion of the apical annular surface 22 and comprised between the two bases 24, and with two sides 25 joining the apical portion respectively with the two bases 24.
  • the teeth 18 are trapezoidal in accordance with the sizes and types of material to be screened.
  • the indentations 19 have an oblong shape substantially parallel to the opposite sides 14 suitable to dispose the chips with an elongated shape parallel to the opposite sides 14. Such indentations facilitate the advancing and drawing action between successive rollers 10 on a same shaft 16, and between interspersed facing rollers present on two contiguous shafts 16, 16'.
  • the chips are accompanied and disposed in the correct position for entry into the passage gap 20, reducing the time needed to screen the material to be selected.
  • Such indentations 19 can affect the whole opposite side 14 or only part of it.
  • the indentations 19a can extend from the larger side 13 up to the base 24 of the teeth 18, that is, they can be of a length comprised between the larger side 13 and the base 24 of the teeth 18.
  • the indentations 19b can extend from the larger side 13 up to the smaller side 12 of the trapezoidal section 11.
  • the indentations 19c can extend from the larger side 13, and partly on the lateral shoulder 15, up to the smaller side 12 of the trapezoidal section 11.
  • the indentations 19c can extend from the larger side 13 up to the smaller side 12 of the trapezoidal section 11 and affect the entire width of the teeth 18, that is, extend from side 25 to side 25 of the teeth 18.
  • the indentations 19 can extend from at least one side 25 of the teeth 18 up to the smaller side 12 of the trapezoidal section 11, or up to the lateral shoulder 15.
  • the indentations 19 can be inclined in the sense of rotation of the roller 10 or in the sense opposite this rotation.
  • the indentations 19 can have a rectangular, or triangular, or wavy, or serrated shape along the opposite side 14 in accordance with the type of material to be selected and eliminated.
  • the indentations 19 on one roller 10 are offset, or aligned with respect to the indentations 19 of an adjacent roller 10.
  • the teeth 18 are also made so as to dispose and accompany the chips with their larger elongated size parallel to the passage gap 20.
  • the indentations 19 and the teeth 18 are suitable to channel impurities, in accordance with their greater weight, respectively toward the lateral shoulders 15 and the bases 24 of the teeth 18 so that they can be eliminated.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Massaging Devices (AREA)
  • Friction Gearing (AREA)
  • Eye Examination Apparatus (AREA)
  • Rolls And Other Rotary Bodies (AREA)
EP20771761.2A 2019-06-12 2020-06-12 Selector roller Active EP3983142B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
RS20250095A RS66472B1 (sr) 2019-06-12 2020-06-12 Selektorski valjak
HRP20250124TT HRP20250124T1 (hr) 2019-06-12 2020-06-12 Valjak za odabir

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102019000008697A IT201900008697A1 (it) 2019-06-12 2019-06-12 Rullo selezionatore
PCT/EP2020/025277 WO2020249263A1 (en) 2019-06-12 2020-06-12 Selector roller

Publications (3)

Publication Number Publication Date
EP3983142A1 EP3983142A1 (en) 2022-04-20
EP3983142B1 true EP3983142B1 (en) 2024-11-13
EP3983142C0 EP3983142C0 (en) 2024-11-13

Family

ID=68138662

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20771761.2A Active EP3983142B1 (en) 2019-06-12 2020-06-12 Selector roller

Country Status (8)

Country Link
EP (1) EP3983142B1 (pl)
ES (1) ES3009093T3 (pl)
HR (1) HRP20250124T1 (pl)
HU (1) HUE070044T2 (pl)
IT (1) IT201900008697A1 (pl)
PL (1) PL3983142T3 (pl)
RS (1) RS66472B1 (pl)
WO (1) WO2020249263A1 (pl)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE649351C (de) * 1931-02-26 1937-08-21 Ross William Walzenrost
US5480034A (en) * 1993-06-22 1996-01-02 Kabushiki Kaisha Miike Tekkosho Screening machine
IT1290732B1 (it) * 1997-03-12 1998-12-10 Pal Srl Dispositivo a rulli per la separazione di chips e particelle a granulometria differenziata e macchina formatrice utilizzante
NL1006993C2 (nl) * 1997-09-10 1999-03-16 Compas B V Maschf Werkwijze en inrichting voor het sorteren van producten.
ITUD20010022A1 (it) * 2001-02-09 2002-08-09 Pal Srl Apparecchiatura e metodo per la separazione di elementi o materiali eventi differenti dimensioni

Also Published As

Publication number Publication date
ES3009093T3 (en) 2025-03-26
HUE070044T2 (hu) 2025-05-28
EP3983142A1 (en) 2022-04-20
WO2020249263A1 (en) 2020-12-17
EP3983142C0 (en) 2024-11-13
IT201900008697A1 (it) 2020-12-12
RS66472B1 (sr) 2025-03-31
PL3983142T3 (pl) 2025-04-14
HRP20250124T1 (hr) 2025-03-28

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