EP3838481B1 - Machine de sablage pour sablage/finition de panneaux en bois, en métal ou analogue - Google Patents

Machine de sablage pour sablage/finition de panneaux en bois, en métal ou analogue Download PDF

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Publication number
EP3838481B1
EP3838481B1 EP20214758.3A EP20214758A EP3838481B1 EP 3838481 B1 EP3838481 B1 EP 3838481B1 EP 20214758 A EP20214758 A EP 20214758A EP 3838481 B1 EP3838481 B1 EP 3838481B1
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EP
European Patent Office
Prior art keywords
sanding
pneumatic circuit
panel
chamber
sanding machine
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.)
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Application number
EP20214758.3A
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German (de)
English (en)
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EP3838481A1 (fr
Inventor
Fabio Balducci
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.)
Biesse SpA
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Biesse SpA
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Publication date
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Publication of EP3838481A1 publication Critical patent/EP3838481A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/06—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving members with limited contact area pressing the belt against the work, e.g. shoes sweeping across the whole area to be ground
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
    • B24B7/28—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/06—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving members with limited contact area pressing the belt against the work, e.g. shoes sweeping across the whole area to be ground
    • B24B21/08—Pressure shoes; Pressure members, e.g. backing belts

Definitions

  • the invention relates to a sanding machine for sanding/finishing panels made of wood, metal or the like, as e.g. known from document DE 42 32 028 A1 , which forms the basis for the preamble of claim 1.
  • a sanding machine which comprises a conveyor belt, which has an upper transport branch defining a substantially horizontal support surface for at least one panel and is designed to feed the panel in a first direction; a sanding device, which is mounted above the support surface so as to sand an upper face of the panel; and a detection device to detect a width of the panel in a second direction, which is parallel to the support surface and transverse to the first direction.
  • the sanding device comprises an abrasive belt, which is wound in a ring shape around a plurality of idler rollers, and a plurality of thrust elements, which are distributed inside the abrasive belt in the second direction and are movable independently of one another in a third direction, which is orthogonal to the support surface, between respective lowered operating positions, in which the corresponding portions of abrasive belt are moved so as to come into contact with the upper face of the panel, and respective raised rest position, in which the corresponding portions of abrasive belt disengage the upper portion of the panel.
  • the thrust elements are fixed to the output rods of respective pneumatic actuator cylinders and are selectively moved to their lowered operating position depending on the width of the panel and/or on the processing to be carried out.
  • Each actuator cylinder comprises a cylinder, which is engaged by the relative output rod in a sliding manner and is divided by the output rod into an upper chamber and a lower chamber.
  • the lower chamber can selectively be connected to a first pneumatic circuit through the interposition of a supply solenoid valve and the upper chamber is connected to a second pneumatic circuit in a continuous manner.
  • each thrust element is normally arranged in its lowered operating position and is selectively moved to its raised rest portion following the activation of the relative supply solenoid valve.
  • the actuator cylinder further comprises a first annular gasket, which is mounted on the output rod so as to separate the lower chamber from the upper chamber in a fluid-tight manner, a second annular gasket, which is mounted on the output rod so as to separate the upper chamber from the lower chamber in a fluid-tight manner, and a third annular gasket, which is mounted on the output rod so as to separate the lower chamber from the outside in a fluid-tight manner.
  • the first annular gasket is a lip gasket designed to radially expand due to the thrust of the first pneumatic circuit and the second annular gasket is a lip gasket designed to radially expand due to the thrust of the second pneumatic circuit.
  • the detection device normally comprises a plurality of contact rollers, which are distributed above the support surface in the second direction and are mounted so as to rotate around respective rotation axes, which are parallel to the second direction.
  • the contact rollers arranged inside the moving path of the panel are lifted from the panel so as to allow the detection device to detect the width of the panel in the second direction.
  • the object of the present invention is to provide a sanding machine for sanding/finishing panels made of wood, metal or the like, which does not suffer from the drawbacks described above and is simple and economic to be manufactured.
  • number 1 indicates, as a whole, a sanding machine for sanding/finishing panels 2 made of wood, metal or the like with a substantially parallelepiped-like shape.
  • the sanding machine 1 comprises a support frame 3 and a feeding device 4, which is mounted on the support frame 3 so as to move the panels 2 one after the other in a horizontal direction 5.
  • the device 4 comprises a conveyor belt 6, which has an upper transport branch defining a horizontal support surface P for the panel 2 and is wound in a ring shape around a pair of motor-driven pulleys 7, which are mounted so as to rotate, relative to the frame 3, around respective longitudinal axes 8, which are parallel to one another and to a horizontal direction 9, which is transverse to the direction 5.
  • the sanding machine 1 further comprises a sanding unit 10 comprising, in turn, an abrasive belt 11, which is wound in a ring shape around a plurality of idler rollers 12 (in particular, three rollers 12), which are mounted so as to rotate around respective longitudinal axes 13 parallel to the direction 9 and are arranged so as to give the belt 11 a substantially triangular configuration.
  • a sanding unit 10 comprising, in turn, an abrasive belt 11, which is wound in a ring shape around a plurality of idler rollers 12 (in particular, three rollers 12), which are mounted so as to rotate around respective longitudinal axes 13 parallel to the direction 9 and are arranged so as to give the belt 11 a substantially triangular configuration.
  • the arrangement of the rollers 12 is such that the belt 11 has a lower branch 14, which is substantially flat and parallel to the plane P.
  • the sanding machine 1 is further provided with a detection device 15, which is mounted above and on the input side of the surface P in order to detect a width of the panel 2 in the direction 9.
  • the device 15 a mechanical detection device comprising a plurality of contact rollers 16, which are distributed above the plane P in the direction 9 and are mounted so as to rotate around respective rotation axes 17, which are parallel to the direction 9.
  • the contact rollers 16 arranged inside the moving path of the panel 2 are lifted from the panel 2 so as to allow the detection device 15 to detect the width of the panel 2 in the direction 9.
  • rollers 16 are eliminated and replaced by a detection device which is not in contact with the panels 2, for example an optical, inductive or capacitive device.
  • the lower branch 14 of the belt 11 is selectively moved so as to come into contact with an upper face 18 of the panels 2 by a thrust device 19, which is mounted inside the belt 11.
  • the device 19 comprises, in particular, a plurality of thrust elements 20, which are distributed inside the belt 11 in the direction 9, are mounted above the branch 14 and are movable independently of one another in a vertical direction 21, which is orthogonal to the directions 5 and 9 and perpendicular to the surface P.
  • Each element 20 is movable in the direction 21 between a lowered operating position, in which the corresponding portion of the belt 11 is moved so as to come into contact with the face 18, and a raised rest position, in which the corresponding portion of the belt 11 is disengaged from the face 18.
  • each element 20 is moved between its lowered operating position and its raised rest position by a relative actuator cylinder 22 comprising a cylinder 23, which has a substantially vertical longitudinal axis 24 and is configured so as to define a wide upper portion 25 and a narrow lower portion 26.
  • the element 20 has the shape of a plate fixed to the free end of an output rod 27 of the actuator cylinder 22 crosswise to the axis 24 and is coupled to the cylinder 23, in a sliding and angularly fixed manner, by means of at least one coupling pin 28 projecting upwards from the element 20 parallel to the direction 21.
  • the rod 27 is engaged in the narrow lower portion 26 in a sliding manner and coaxially to the axis 24, projects downwards from the cylinder 23 in the direction 21 and is provided with a plate 29, which is engaged in the wide upper portion 25 in a sliding manner and divides the cylinder 23 into an upper chamber 30 and a lower chamber 31.
  • the chamber 30 is continuously connected to a first pneumatic circuit (not shown), which is configured to feed compressed air at a first pressure into the chamber 30, or to a second pneumatic circuit (not shown), which is configured to feed compressed air at a second pressure, which is different from the first pressure, into the chamber 30.
  • the chamber 30 is selectively connected to the first pneumatic circuit or to the second pneumatic circuit by means of a supply solenoid valve 32 so as to selectively control the sanding force exerted by the element 20 and, hence, by the belt 11 upon the panels 2.
  • the chamber 31 can selectively be connected, by means of a supply solenoid valve 33, to a third pneumatic circuit (not shown), which is configured to feed compressed air into the chamber 31 and move the element 20 to its raised rest position.
  • the pressure of the compressed air fed into the chamber 30 is, in any case, smaller than the pressure of the compressed air fed into the chamber 31.
  • the actuator cylinder 22 further comprises a first annular gasket 34, which is mounted on the rod 27 so as to separate the chamber 30 from the chamber 31 in a fluid-tight manner, a second annular gasket 35, which is mounted on the rod 27 so as to separate the chamber 31 from the chamber 30 in a fluid-tight manner, and a third annular gasket 36, which is mounted on the rod 27 so as to separate the chamber 31 from the outside in a fluid-tight manner.
  • the gasket 34 is a lip gasket, which is designed to radially expand due to the thrust of the compressed air fed into the chamber 30 by the first pneumatic circuit (not shown) or by the second pneumatic circuit (not shown), and the gasket 35 is a lip gasket, which is designed to radially expand due to the thrust of the compressed air fed into the chamber 31 by the third pneumatic circuit (not shown).
  • the solenoid valve 33 is normally arranged in an opening position, in which the compressed air fed into the chamber 31 exerts, upon the rod 27, a pneumatic force that is greater than the sum of a pneumatic force exerted upon the rod 27 by the compressed air fed into chamber 30 and of a friction force exerted upon the rod 27 by the gaskets 34, 35, 36.
  • the machine 1 is further provided with an electronic control unit 37, which communicates with the rollers 16 and with the solenoid valves 32 and 33 of each actuator cylinder 22.
  • the unit 37 is configured so as to receive, from the rollers 16, information concerning the detection of the width of each panel 2 in the direction 9 and so as to control the operation of the solenoid valve 32 in order to select the sanding force exerted by each thrust element 20 upon the corresponding portion of abrasive belt 11.

Claims (7)

  1. Machine de ponçage pour le ponçage/la finition de panneaux (2) fabriqués en bois, en métal ou analogue, la machine de ponçage comprenant un dispositif d'alimentation (4), qui définit une surface de support (P) pour au moins un panneau (2) et qui est conçu pour acheminer le panneau (2) dans une première direction (5) ; un dispositif de ponçage (10), qui est monté au-dessus de la surface de support (P) et comprend, lui-même, une bande abrasive (11), qui est entourée en forme d'anneau autour d'une pluralité de rouleaux-guides (12) de manière à poncer une face supérieure (18) du panneau (2) ; une pluralité d'éléments de poussée (20), qui sont répartis à l'intérieur de la bande abrasive (11) dans une deuxième direction (9), qui est transversale à la première direction (5) et parallèle à la surface de support (P) ; et, pour chaque élément de poussée (20) un cylindre actionneur (22) respectif pour déplacer l'élément de poussée (20) entre une position de fonctionnement abaissée, dans laquelle l'élément de poussée (20) déplace la bande abrasive (11) de manière à l'amener à venir en contact avec la face supérieure (18) du panneau (2) ; et une position de repos surélevée ; chaque cylindre actionneur (22) comprenant un cylindre (23), une tige de sortie (27), qui vient en prise dans le cylindre (23) de manière coulissante et est configurée pour diviser le cylindre (23) en une chambre supérieure (30) et une chambre inférieure (31), un premier circuit pneumatique communiquant avec la chambre supérieure (30) de manière à déplacer l'élément de poussée (20) vers sa position de fonctionnement abaissée avec une première force de ponçage, un deuxième circuit pneumatique communiquant avec la chambre inférieure (31) de manière à déplacer l'élément de poussée (20) vers sa position de repos surélevée, et un troisième circuit pneumatique communiquant avec la chambre supérieure (30) de manière à déplacer l'élément de poussée (30) vers sa position de fonctionnement abaissée avec une deuxième force de ponçage, qui est différente de la première force de ponçage ; et étant caractérisée en ce que chaque cylindre actionneur (22) comprend en outre une électrovanne d'alimentation (32) pour connecter de manière sélective la chambre supérieure (30) auxdits premier et troisième circuits et une deuxième électrovanne d'alimentation (33) pour connecter de manière sélective la chambre inférieure (31) au deuxième circuit pneumatique ; la première électrovanne d'alimentation (32) de chaque cylindre actionneur (22) étant configurée pour connecter en continu la chambre supérieure (30) au premier circuit pneumatique ou au troisième circuit pneumatique ; et une unité de commande électronique (37) étant prévue pour commander de manière sélective le fonctionnement de la première électrovanne d'alimentation (32.)
  2. Machine de ponçage selon la revendication 1, et comprenant en outre un dispositif de détection (15) pour détecter une taille du panneau (2) dans la deuxième direction (9) ; le dispositif de détection (15) comprenant, pour chaque élément de poussée (20), un organe de contact (16) respectif, qui est conçu pour venir en contact avec le panneau (2) après l'acheminement du panneau (2) dans la première direction (5).
  3. Machine de ponçage selon la revendication 2, dans laquelle l'unité de commande électronique (37) communique avec chaque organe de contact (16) et avec la première électrovanne d'alimentation (32) du cylindre actionneur (22) de l'élément de poussée (20) relatif de manière à connecter de manière sélective la chambre supérieure (30) relative au premier circuit pneumatique ou au troisième circuit pneumatique en réponse à un signal provenant de l'organe de contact (16).
  4. Machine de ponçage selon l'une quelconque des revendications précédentes, dans laquelle la deuxième électrovanne d'alimentation (33) est mobile entre une position d'ouverture, dans laquelle la chambre inférieure (31) communique avec le deuxième circuit pneumatique, et une position de fermeture, dans laquelle la chambre inférieure (31) communique avec l'extérieur.
  5. Machine de ponçage selon l'une quelconque des revendications précédentes, dans laquelle chaque cylindre actionneur (22) comprend en outre un premier joint annulaire (34) pour séparer la chambre supérieure (30) de la chambre inférieure (31) de manière étanche, et un deuxième joint annulaire (35) pour séparer la chambre inférieure (31) de la chambre supérieure (30) de manière étanche, et un troisième joint annulaire (36) pour séparer la chambre inférieure (31) de l'extérieur de manière étanche.
  6. Machine de ponçage selon la revendication 5, dans laquelle lesdits premier, deuxième et troisième joints annulaires (34, 35, 36) sont montés sur la tige de sortie (27).
  7. Machine de ponçage selon la revendication 5 ou 6, dans laquelle le premier joint annulaire (34) et un joint à lèvre conçu pour se dilater radialement du fait de la poussée du premier circuit pneumatique ou du troisième circuit pneumatique, et dans laquelle le deuxième joint annulaire (35) est un joint à lèvre conçu pour se dilater radialement du fait de la poussée du deuxième circuit pneumatique.
EP20214758.3A 2019-12-16 2020-12-16 Machine de sablage pour sablage/finition de panneaux en bois, en métal ou analogue Active EP3838481B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT201900004572 2019-12-16

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EP3838481A1 EP3838481A1 (fr) 2021-06-23
EP3838481B1 true EP3838481B1 (fr) 2024-01-24

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1235915B (it) * 1989-10-31 1992-12-02 Dmc Spa Architettura per traverse di supporto di pattini pressori,in particolare utilizzabili su macchine per la lavorazione del legno
DE4232028C2 (de) * 1992-09-24 1995-01-05 Buetfering Maschinenfabrik Gmb Druckbalken für eine Breitbandschleifmaschine
ITBO20070648A1 (it) * 2007-09-24 2009-03-25 Viet Spa Dispositivo di spinta per un tampone di una levigatrice.
ITBO20130437A1 (it) * 2013-08-05 2015-02-06 Viet Italia S R L Con Unico Socio Metodo e macchina per la levigatura di pannelli di legno o simili

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