EP3790665B1 - Automatische airbrush-beschichtungsvorrichtung und verarbeitungsverfahren unter verwendung der besagten vorrichtung - Google Patents

Automatische airbrush-beschichtungsvorrichtung und verarbeitungsverfahren unter verwendung der besagten vorrichtung Download PDF

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Publication number
EP3790665B1
EP3790665B1 EP19727913.6A EP19727913A EP3790665B1 EP 3790665 B1 EP3790665 B1 EP 3790665B1 EP 19727913 A EP19727913 A EP 19727913A EP 3790665 B1 EP3790665 B1 EP 3790665B1
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EP
European Patent Office
Prior art keywords
air
coating
turntable
conduit
coating system
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EP19727913.6A
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English (en)
French (fr)
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EP3790665A1 (de
Inventor
Giuliano Dal Ceredo
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Dal Ceredo Technology Srl
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Dal Ceredo Technology Srl
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2489—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device
    • B05B7/2491—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device characterised by the means for producing or supplying the atomising fluid, e.g. air hoses, air pumps, gas containers, compressors, fans, ventilators, their drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0463—Installation or apparatus for applying liquid or other fluent material to moving work of indefinite length
    • B05B13/0484—Installation or apparatus for applying liquid or other fluent material to moving work of indefinite length with spray heads having a circular motion, e.g. being attached to a rotating supporting element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/1606—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air
    • B05B7/1613—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/0221—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts

Definitions

  • the present invention relates to a coating apparatus applicable to coating booths mainly although not exclusively used in the sector of treating leathers or other materials using machines of the rotary turntable type or alternative, to which numerous automatic airbrushes are applied.
  • the actuated machine allows the introduction of a single flow of hot air with various airbrushes connected to the distribution system of the air called the working fluid.
  • Such heated working fluid is introduced through an insulated conduit which is located on the supporting part of the rotating turntable, which then continues towards the airbrushes through a tube that is also insulated, having dimensions adapted to the necessary flow of working air, ending directly at the airbrush, obtaining rather higher performance results with respect to traditional applications that use unheated working air, with important improvements in the application of the coatings on the objects to be treated.
  • the system according to the invention is applied in the sector of coating leathers but can also be advantageously used in the sector of wood or ceramic, through relevant similar machines in which numerous airbrushes are installed, the number of which will vary according to whether they are leather or wood or ceramic coating processes.
  • Automatic spray coating systems use compressed air as the working fluid for atomising the coating so that it can be deposited onto different types of surfaces uniformly, e.g. on leather, wooden objects, or made of ceramic or other materials.
  • Traditional pneumatic spray coating systems for leathers but, more generally, also other products, comprise a coating booth inside which a conveyor belt with a horizontal arrangement runs on which the leathers are placed so that they can be moved along an advancement direction and according to a predefined conveying speed.
  • a rotating turntable is arranged, placed on a circular axis of rotation synchronised with the advancement of the leathers.
  • a plurality of spray guns is applied to said turntable, which are placed at regular distances from each other along the peripheral area of the turntable itself and facing towards the conveyor belt, so as to be able to apply the coating onto the leathers or other parts that are advancing while the turntable rotates at a predefined rotation speed.
  • the turntable while rotating, allows the vertically installed airbrushes to spray the coating onto the parts to be coated, dispensing the product in a fan-like way onto said parts.
  • the airbrushes are managed automatically and separately from each other by an electronic control, whereas the compressed air used during atomisation is taken from the dedicated circuit.
  • Compressed air represents the working fluid coming from a general compressed air line and passing through a variable pressure regulator, and conveyed air filtration.
  • the traditional type of filters that are used for filtering the compressed air use separating cartridges made of fibre, to be able to dehumidify the air through pressure absorption, and remove any oily particles and/or residues of hydrocarbons obtaining compressed, filtered and dehumidified air.
  • the flow rate of traditional compressed air systems for coating systems can also be very variable and in the event of only one airbrush the consumption of working air can reach about 900 Nl/minute, i.e. Normal litre per minute (i.e. about 0,015 Nm 3 /s [Normal cubic metre per second]), considered an optimal consumption, but only by traditional standards.
  • document EP2189544A1 in accordance with its abstract, states an equipment for working flexible laminar surfaces, such as, notably, tannery leathers, comprising a spray booth, within which the working of the aforesaid leathers takes place, which are placed on at least one conveyor belt sliding below a series of devices, suitable to apply one or more cover products, according to predetermined modes, on a prefixed portions of the leathers; in particular, it is provided to perform the cleaning of the aforesaid devices used for applying the cover products and the relative plants in hidden time, i.e. in time intervals during which at least one of these devices is at rest.
  • tannery leathers comprising a spray booth, within which the working of the aforesaid leathers takes place, which are placed on at least one conveyor belt sliding below a series of devices, suitable to apply one or more cover products, according to predetermined modes, on a prefixed portions of the leathers; in particular, it is provided to perform the cleaning of the aforesaid devices
  • the present invention sets out to provide a machine for a booth that uses various airbrushes connected by means of a dedicated hot air feed conduit to guarantee high flow rates, so as to be able to serve various spray guns with a single heating system, in order to eliminate or at least dramatically reduce the drawbacks highlighted above.
  • the air introduced through the feed circuit crosses a heating system that can increase the temperature thereof and improve the application of the coatings to parts, thus creating an optimal condition for the purpose of the quality of the result obtained.
  • Such working air flow heating system conveying in the insulated conduit related to the atomisation of the airbrushes, crosses a heating device which, as well as comprising a filtering and dehumidifying system, is adapted to dispense hot air through the distribution conduit positioned above the rotary turntable.
  • the air treated through filtering and heating offers the ideal working conditions for the coating airbrushes, by placing the installed heating system in the condition to be able to also withstand the load of various airbrushes activated simultaneously.
  • the invention further sets out to lower the viscosity of the coating through the exchange that takes place when the product is split up with the heated atomisation working air, with a consequent reduction of the quantity of air used and therefore lower waste of dispensed coating and a significant increase in the transfer index, whose value can even reach 90%.
  • the main advantage of this solution relates to the fact that the coating system according to the invention makes it possible on one hand to perform coating operations reducing the waste of materials and means to a minimum, and on the other to reach rather higher qualitative results than those that can be obtained with traditional cold air systems.
  • 10 generally indicates a coating system according to the invention as a whole.
  • the coating system 10 comprises a conveyor belt 11 adapted to move the articles undergoing coating along a substantially horizontal advancement direction, so that from the spraying area the coated articles can be conveyed towards a drying oven indicated overall with 12.
  • the system 10 comprises a rotary turntable 13 represented in a plan view in figure 2 , which is located on a frame above the conveyor belt 11 and is rotatable according to an axis of rotation orthogonal to a plane of the conveyor 11 itself on which the leathers or other articles to be coated lie and are moved.
  • the rotary turntable 13 comprises a plurality of spray guns 14 for spraying the coating, said guns 14 being mounted along the outer circumference of the turntable 13, in the example illustrated in figure 2 , each of them is positioned on the end of arms 15 extending radially with respect to the axis of rotation.
  • the spray guns 14 are positioned on the end of conduits coming from a compressed air line 16, one of the hoses 17 thereof forms the conduit 18 that enters the turntable with the conduit 19 and branches off inside the turntable into the various channels for each gun.
  • a device 20 which represents the main characteristic of the invention as it constitutes the element for heating and filtering the air introduced into the guns 14.
  • the device 20 comprises an external tube 21, an internal heating tube 22, which, in turn, internally comprises a group of electrical heating elements 23.
  • the device 20 is equipped, at its lower base, with a bottom cover 24, whereas at the top it is closed by a cap or head 25.
  • the cap 25 is provided with an air inlet hole 26, an air outlet hole 27, and a plurality of smaller holes 28 suitable for passage of cables and feed probes.
  • the device 20 comprises spaces afforded between the external tube 21 and the internal heating tube 22, the latter, in turn, being provided with windows 29 in the lower part thereof, for passage of the air entering from the inlet 26 and exiting from the outlet 27.
  • the device 20 is equipped internally with electrical heating elements 23 located in proximity to the respective dissipaters that are licked by the air passing into the device and conveyed towards the guns 14.
  • the system thus described is commanded and controlled by a computerised control unit that controls all of the operating parameters that have been set and particularly the air temperature that has been set and is necessary for correct use of the system, by acting on the activation and deactivation of the heating elements.
  • the device 20 is newly conceived in this sector and is applied to the compressed air inlet that feeds the complete machine, and the total air consumption of such machine notably exceeds the flow rate of the machines currently on the market, as the indicative rated consumption for 12 guns is around 6500/7000 Nl/h (i.e. between about 0,0018 Nm 3 /s and about 0,0019 Nm 3 /s, where " Nm 3 " is Normal cubic metre).
  • a further characteristic of the invention comes from the presence of insulated working air conduits.
  • Such conduits start from the heating device 20, pass through the distribution manifold 30 shown in figures 1 and 2 , to be connected with the distribution conduit 15, also insulated, which feeds each individual gun.
  • the air at the inlet enters the device 20 at room temperature.
  • the air flow reaches the bottom of the device 24, where it inverts its direction and enters the internal cylindrical body 22 where the heating elements 23 are positioned each of which, in the case in question, is packed between two finned dissipaters, which are licked by the air flow along the whole length thereof yielding heat to the air itself.
  • the electronic control system Based on the temperature measurement of the exiting air detected by the thermistor, the electronic control system compares this value with the value entered by the user and adjusts the activation and deactivation of the heating elements in a continuous modulation mode with an indicative absorption of around 16 A.
  • the elements are switched on and off by means of a feedback (or “tracking") control that constantly compares the value just read with the objective value, in an attempt to bring the magnitudes of interest towards such value, with a typically asymptotic trend or characterised by small oscillations.
  • a feedback or “tracking” control that constantly compares the value just read with the objective value, in an attempt to bring the magnitudes of interest towards such value, with a typically asymptotic trend or characterised by small oscillations.
  • the adjustment parameters are, in this case, all the possible ones: proportional, integral and derivative (PID type control).
  • the elements are not supplied or cut off according to the start-stop modes typical of common thermostats, as PID control allows continuous adjustment and with a small hysteresis range.
  • the elements are supplied by a solid state static relay, controlled by the control board with PWM logic, which sends them high frequency voltage pulses with a variable duration of each pulse, according to the temperature difference measured between the outlet air and the set value.
  • the modulation takes place based on times of 2 msec with a variable work cycle from 0 to 100%, with minimum variations of 0.5%.
  • the coating system according to the invention allows a sufficient flow rate to be obtained so that the booth and therefore also the guns for the air heated and filtered from all impurities, are treated so as to:
  • an auxiliary heating unit 33 is inserted along said conduit 18 that enters the turntable 13 through the conduit 19 for branching off into the latter in the various channels of each spray gun 14 and downstream of said device 20, along said auxiliary heating unit 33 is inserted.
  • Said auxiliary unit 33 comprises an insulated and protected tubular element that is introduced coaxially into the conduit in which it is inserted, which in turn comprises electrical heating elements 34 and a control probe for maintaining the temperature managed by the control unit of the system.
  • control system through the control unit that manages the heating process can be interfaced with the different company management IT systems.

Landscapes

  • Nozzles (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (7)

  1. Beschichtungssystem (10), umfassend:
    a) ein Förderband (11), das angepasst ist, um die Gegenstände, die einer Beschichtung unterzogen werden, entlang einer im Wesentlichen horizontalen Vorschubrichtung zu einem Trockenofen (12) zu bewegen;
    b) einen Drehtisch (13), der sich auf einem Rahmen innerhalb einer Sprühkabine über dem Förderband (11) befindet und der gemäß einer Drehachse senkrecht zu einer ebenen Oberfläche des Förderbands (11) drehbar ist;
    c) wobei der Drehtisch (13) eine Vielzahl von Sprühpistolen (14) zum Sprühen der Beschichtung umfasst, wobei die Pistolen (14) entlang des Außenumfangs des Drehtischs (13) montiert und am Ende von Leitungen positioniert sind, die von einer Druckluftleitung (16) durch mindestens einen Schlauch (17) kommen, der eine Leitung (18) bildet, die in den Drehtisch eintritt und in Richtung einer jeden Pistole abzweigt, um Druckluft zu liefern;
    wobei entlang der Leitung (18) zum Kanalisieren von Luft und stromaufwärts des Drehtisches, der in der Sprühkabine in Bezug auf die Vorschubrichtung des Förderbands (11) angeordnet ist, eine Vorrichtung (20), die mit Mitteln zum Erhitzen, Filtern und Entfeuchten der Arbeitsluft ausgestattet ist, die in die Pistolen (14) eingeführt wird, eingesetzt ist, wobei die Vorrichtung (20) ein äußeres zylindrisches Rohr (21) und ein inneres zylindrisches Heizrohr (22) umfasst, das wiederum intern eine Gruppe von elektrischen Heizelementen (23) umfasst, zwischen dem äußeren (21) und dem inneren (22) Rohrraum für den Durchgang von Luft positioniert ist, die in die Vorrichtung (20) von einem Einlass (26) eintritt und aus der Vorrichtung (20) aus einem Auslass (27) austritt, wobei das innere Heizrohr (22) wiederum im unteren Teil mit Fenstern (29) für den Durchgang der Luft versehen ist, die aus dem Einlass (26) eintritt und aus dem Auslass (27) austritt, und wobei Druckluft durch ein Mundstück (26) der Vorrichtung (20) eingeführt wird, und nachdem sie durch einen Raum (32) gelaufen ist, der an der Innenwand des äußeren zylindrischen Rohrs (21) haftet, erreicht der Luftstrom den Boden (24) der Vorrichtung (20), wo er seine Richtung umkehrt und in das innere zylindrische Heizrohr (22) eintritt, in dem die elektrischen Heizelemente (23) positioniert sind, um dann, geheizt, zum Auslass (27) und von diesem zur Kanalisierung (19, 30) und dann zu den Sprühpistolen (14) befördert zu werden.
  2. Beschichtungssystem (10) nach Anspruch 1, dadurch gekennzeichnet, dass Arbeitsluftleitungen, die von der Vorrichtung (20) ausgehen, durch einen Verteiler (30) führen und dann mit einer Verteilerleitung (15) verbunden sind, die eine jede Pistole versorgt, isoliert sind.
  3. Beschichtungssystem (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Vorrichtung (20) an ihrer unteren Basis mit einer unteren Abdeckung (24) ausgestattet ist, während sie an der Oberseite durch eine Kappe oder einen Kopf (25) verschlossen ist.
  4. Beschichtungssystem (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Kappe (25) an der Vorrichtung (20) mit einem Lufteinlassloch (26), einem Luftauslassloch (27) und einer Vielzahl von Löchern (28) versehen ist, die für den Durchgang von Kabeln und Zuführsonden geeignet sind.
  5. Beschichtungssystem (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es von einer computerisierten Steuereinheit befohlen und gesteuert wird, die alle eingestellten Betriebsparameter steuert, und wobei das elektronische Steuersystem auf der Grundlage einer Messung eines Temperaturwerts der Luft, die aus der Vorrichtung (20) austritt, die von einem Thermistor erfasst wird, den gemessenen Wert mit einem Temperaturwert vergleicht, der vom Benutzer eingegeben wurde, wobei das elektronische Steuersystem die Aktivierung und Deaktivierung der Heizelemente (23) in einem kontinuierlichen Modulationsmodus einstellt.
  6. Beschichtungssystem (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass entlang der Leitung (18), die in den Drehtisch (13) durch eine Leitung (19) eintritt, um in diese in die verschiedenen Kanäle einer jeder Sprühpistole (14) und stromabwärts der Vorrichtung (20) abzuzweigen, eine Hilfsheizeinheit (33) eingesetzt ist.
  7. Beschichtungssystem (10) nach Anspruch 6, dadurch gekennzeichnet, dass die Hilfseinheit (33) ein isoliertes und geschütztes rohrförmiges Element umfasst, das koaxial in die Leitung eingeführt wird, in die es eingesetzt wird, welche wiederum elektrische Heizelemente (34) und eine Steuersonde zum Aufrechterhalten der Temperatur umfasst, die durch die Steuereinheit des Systems verwaltet wird.
EP19727913.6A 2018-05-10 2019-05-09 Automatische airbrush-beschichtungsvorrichtung und verarbeitungsverfahren unter verwendung der besagten vorrichtung Active EP3790665B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT201800005249 2018-05-10
PCT/IB2019/053810 WO2019215653A1 (en) 2018-05-10 2019-05-09 Automatic airbrush coating apparatus and processing method using said apparatus

Publications (2)

Publication Number Publication Date
EP3790665A1 EP3790665A1 (de) 2021-03-17
EP3790665B1 true EP3790665B1 (de) 2022-11-09

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EP19727913.6A Active EP3790665B1 (de) 2018-05-10 2019-05-09 Automatische airbrush-beschichtungsvorrichtung und verarbeitungsverfahren unter verwendung der besagten vorrichtung

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EP (1) EP3790665B1 (de)
CN (1) CN112384305A (de)
BR (1) BR112020022814A2 (de)
WO (1) WO2019215653A1 (de)

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CN110721850A (zh) * 2019-11-29 2020-01-24 安徽富坤机械设备有限公司 一种小型汽车金属配件双面喷漆装置

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ITTV20070090A1 (it) * 2007-05-22 2008-11-23 Walmec Spa Apparecchiatura di verniciatura pneumatica con pistola a spruzzo, con dispositivo riscaldatore e dispositivo deumidificatore/essiccatore provvisto di dispositivo di rigenerazione dell'agente adsorbente per fluidificare la vernice.
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WO2014081216A1 (ko) * 2012-11-23 2014-05-30 주식회사 아모그린텍 유기박막 형성장치 및 유기박막 형성방법과 이를 이용한 유기 박막소자의 제조방법
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CN112384305A (zh) 2021-02-19
WO2019215653A1 (en) 2019-11-14
BR112020022814A2 (pt) 2021-02-02
EP3790665A1 (de) 2021-03-17

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