EP3838481B1 - Schleifmaschine zum schleifen/endbearbeiten von platten aus holz, metall oder dergleichen - Google Patents

Schleifmaschine zum schleifen/endbearbeiten von platten aus holz, metall oder dergleichen 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
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Application number
EP20214758.3A
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English (en)
French (fr)
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EP3838481A1 (de
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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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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Claims (7)

  1. Schleifmaschine zum Schleifen/Endbearbeiten von Platten (2) aus Holz, Metall oder dergleichen, wobei die Schleifmaschine umfasst:
    eine Zuführvorrichtung (4), die eine Auflagefläche (P) für mindestens eine Platte (2) definiert und dazu ausgelegt ist, die Platte (2) in einer ersten Richtung (5) zuzuführen;
    eine Schleifvorrichtung (10), die oberhalb der Auflagefläche (P) angebracht ist und ihrerseits ein Schleifband (11) umfasst, das ringförmig um eine Vielzahl von Umlenkrollen (12) herumgewickelt ist, um eine obere Fläche (18) der Platte (2) zu schleifen;
    eine Vielzahl von Schubelementen (20), die innerhalb des Schleifbandes (11) in einer zweiten Richtung (9) verteilt sind, die quer zur ersten Richtung (5) und parallel zur Auflagefläche (P) verläuft; und
    für jedes Schubelement (20) einen jeweiligen Betätigungszylinder (22), um das Schubelement (20) zwischen einer abgesenkten Betriebsposition, in der das Schubelement (20) das Schleifband (11) so bewegt, dass es mit der oberen Fläche (18) der Platte (2) in Kontakt kommt, und einer angehobenen Ruheposition zu bewegen;
    wobei jeder Betätigungszylinder (22) umfasst:
    einen Zylinder (23),
    eine Abtriebsstange (27), die gleitend in den Zylinder (23) eingreift und so konfiguriert ist, dass sie den Zylinder (23) in eine obere Kammer (30) und eine untere Kammer (31) unterteilt,
    einen ersten Pneumatikkreis, der mit der oberen Kammer (30) in Verbindung steht, um das Schubelement (20) mit einer ersten Schleifkraft in seine abgesenkte Betriebsposition zu bewegen,
    einen zweiten Pneumatikkreis, der mit der unteren Kammer (31) in Verbindung steht, um das Schubelement (20) in seine angehobene Ruheposition zu bewegen, und
    einen dritten Pneumatikkreis, der mit der oberen Kammer (30) in Verbindung steht, um das Schubelement (30) mit einer zweiten Schleifkraft, die sich von der ersten Schleifkraft unterscheidet, in seine abgesenkte Betriebsposition zu bewegen; und
    dadurch gekennzeichnet, dass jeder Betätigungszylinder (22) weiterhin ein erstes Versorgungsmagnetventil (32) umfasst, um die obere Kammer (30) mit dem ersten und dritten Pneumatikkreis selektiv zu verbinden, und ein zweites Versorgungsmagnetventil (33) umfasst, um die untere Kammer (31) selektiv mit dem zweiten Pneumatikkreis zu verbinden, wobei das erste Versorgungsmagnetventil (32) jedes Betätigungszylinders (22) so konfiguriert ist, dass es die obere Kammer (30) kontinuierlich mit dem ersten Pneumatikkreis oder mit dem dritten Pneumatikkreis verbindet, und eine elektronische Steuereinheit (37) vorgesehen ist, um den Betrieb des ersten Versorgungsmagnetventils (32) selektiv zu steuern.
  2. Schleifmaschine nach Anspruch 1 und weiterhin umfassend eine Erfassungsvorrichtung (15) zum Erfassen einer Größe der Platte (2) in der zweiten Richtung (9), wobei die Erfassungsvorrichtung (15) für jedes Schubelement (20) ein jeweiliges Kontaktelement (16) umfasst, das so ausgelegt ist, dass es nach dem Vorschub der Platte (2) in der ersten Richtung (5) mit der Platte (2) in Kontakt kommt.
  3. Schleifmaschine nach Anspruch 2, wobei die elektronische Steuereinheit (37) mit jedem Kontaktelement (16) und mit dem ersten Versorgungsmagnetventil (32) des Betätigungszylinders (22) des jeweiligen Schubelements (20) in Verbindung steht, um die jeweilige obere Kammer (30) als Reaktion auf ein Signal, das von dem Kontaktelement (16) kommt, selektiv mit dem ersten Pneumatikkreis oder dem dritten Pneumatikkreis zu verbinden.
  4. Schleifmaschine nach einem der vorhergehenden Ansprüche, wobei das zweite Versorgungsmagnetventil (33) zwischen einer Öffnungsstellung, in der die untere Kammer (31) mit dem zweiten Pneumatikkreis in Verbindung steht, und einer Schließstellung, in der die untere Kammer (31) mit der Außenseite in Verbindung steht, beweglich ist.
  5. Schleifmaschine nach einem der vorhergehenden Ansprüche, wobei jeder Betätigungszylinder (22) weiterhin eine erste ringförmige Dichtung (34) zur fluiddichten Trennung der oberen Kammer (30) von der unteren Kammer (31), eine zweite ringförmige Dichtung (35) zur fluiddichten Trennung der unteren Kammer (31) von der oberen Kammer (30), und eine dritte ringförmige Dichtung (36) zur fluiddichten Trennung der unteren Kammer (31) von der Außenseite umfasst.
  6. Schleifmaschine nach Anspruch 5, wobei die erste, zweite und dritte ringförmige Dichtung (34, 35, 36) an der Abtriebsstange (27) angebracht sind.
  7. Schleifmaschine nach Anspruch 5 oder 6, wobei die erste ringförmige Dichtung (34) eine Lippendichtung ist, die so ausgelegt ist, dass sie sich aufgrund des Schubs des ersten Pneumatikkreises oder des dritten Pneumatikkreises radial ausdehnt, und wobei die zweite ringförmige Dichtung (35) eine Lippendichtung ist, die so ausgelegt ist, dass sie sich aufgrund des Schubs des zweiten Pneumatikkreises radial ausdehnt.
EP20214758.3A 2019-12-16 2020-12-16 Schleifmaschine zum schleifen/endbearbeiten von platten aus holz, metall oder dergleichen Active EP3838481B1 (de)

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IT201900004572 2019-12-16

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EP3838481B1 true EP3838481B1 (de) 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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