EP3790665B1 - Appareil de revêtement aérographe automatique et méthode de traitement utilisant ledit appareil - Google Patents

Appareil de revêtement aérographe automatique et méthode de traitement utilisant ledit appareil 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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German (de)
English (en)
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EP3790665A1 (fr
Inventor
Giuliano Dal Ceredo
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Dal Ceredo Technology Srl
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Dal Ceredo Technology Srl
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Classifications

    • 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. Système de revêtement (10), comprenant :
    a) une bande transporteuse (11) adaptée pour déplacer les articles en cours de revêtement le long d'une direction d'avancement essentiellement horizontale vers un four de séchage (12) ;
    b) un carrousel rotatif (13) situé sur un châssis à l'intérieur d'une cabine de pulvérisation au-dessus de la bande transporteuse (11) et qui peut tourner selon un axe de rotation perpendiculaire à une surface plane du transporteur (11) ;
    c) ledit carrousel rotatif (13) comprenant une pluralité de pistolets de pulvérisation (14) pour pulvériser le revêtement, lesdits pistolets (14) étant montés le long de la circonférence extérieure du carrousel (13) et positionnés à l'extrémité de conduits provenant d'une ligne d'air comprimé (16) par l'intermédiaire d'au moins un tuyau (17) qui forme un conduit (18) qui entre dans le carrousel et se ramifie vers chaque pistolet pour délivrer de l'air comprimé ;
    dans lequel le long dudit conduit (18) pour canaliser l'air et en amont dudit carrousel situé dans la cabine de pulvérisation par rapport à la direction d'avancement de la bande transporteuse (11), est inséré un dispositif (20) équipé de moyens pour chauffer, filtrer et déshumidifier l'air de travail qui est introduit dans les pistolets (14), dans lequel ledit dispositif (20) comprend un tube cylindrique externe (21) et un tube chauffant cylindrique interne (22), qui, à son tour, comprend intérieurement un groupe d'éléments chauffants électriques (23), entre lesdits tubes externe (21) et interne (22) des espaces étant positionnés pour le passage de l'air entrant dans ledit dispositif (20) à partir d'une entrée (26) et sortant dudit dispositif (20) à partir d'une sortie (27), ledit tube chauffant interne (22) étant à son tour pourvu, dans la partie inférieure, de fenêtres (29) pour le passage de l'air entrant par l'entrée (26) et sortant par la sortie (27), et dans lequel l'air comprimé est introduit par une embouchure (26) dudit dispositif (20), et après avoir traversé un espace (32) adhérant à la paroi interne du tube cylindrique externe (21), le flux d'air atteint le fond (24) du dispositif (20) où il inverse sa direction et entre dans le tube cylindrique interne chauffant (22) où sont positionnés les éléments chauffants électriques (23), pour être ensuite acheminé, chauffé, vers la sortie (27) et de cette dernière vers des canalisations (19, 30) et ensuite vers les pistolets de pulvérisation (14).
  2. Système de revêtement (10) selon la revendication 1, caractérisé en ce que les conduits d'air de travail, qui partent du dispositif (20), passent par un collecteur de distribution (30) et se raccordent ensuite à un conduit de distribution (15) qui alimente chaque pistolet, sont isolés.
  3. Système de revêtement (10) selon une des revendications précédentes, caractérisé en ce que, à sa base inférieure, ledit dispositif (20) est équipé d'un couvercle inférieur (24), tandis qu'au sommet, il est fermé par un capuchon ou tête (25).
  4. Système de revêtement (10) selon une des revendications précédentes, caractérisé en ce que le capuchon (25) sur ledit dispositif (20) est pourvu d'un trou d'entrée d'air (26), d'un trou de sortie d'air (27) et d'une pluralité de trous (28) adaptés au passage de câbles et de sondes d'alimentation.
  5. Système de revêtement (10) selon une des revendications précédentes, caractérisé en ce qu'il est commandé et contrôlé par une unité de commande informatisée qui contrôle tous les paramètres de fonctionnement qui ont été réglés, et dans lequel le système de contrôle électronique, sur la base de la mesure d'une valeur de température de l'air sortant du dispositif (20) détectée par un thermistor, compare ladite valeur mesurée à une valeur de température entrée par l'utilisateur, le système de contrôle électronique ajustant l'activation et la désactivation des éléments chauffants (23) dans un mode de modulation continue.
  6. Système de revêtement (10) selon une des revendications précédentes, caractérisé en ce que le long dudit conduit (18) qui entre dans le carrousel par un conduit (19) pour se brancher dans ce dernier dans les différents canaux de chaque pistolet de pulvérisation (14) et en aval dudit dispositif (20), une unité de chauffage auxiliaire (33) est insérée.
  7. Système de revêtement (10) selon la revendication 6, caractérisé en ce que ladite unité auxiliaire (33) comprend un élément tubulaire isolé et protégé qui est introduit coaxialement dans le conduit dans lequel il est inséré, qui comprend à son tour des éléments chauffants électriques (34) et une sonde de contrôle pour maintenir la température gérée par l'unité de contrôle du système.
EP19727913.6A 2018-05-10 2019-05-09 Appareil de revêtement aérographe automatique et méthode de traitement utilisant ledit appareil Active EP3790665B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT201800005249 2018-05-10
PCT/IB2019/053810 WO2019215653A1 (fr) 2018-05-10 2019-05-09 Appareil de revêtement aérographe automatique et méthode de traitement utilisant ledit appareil

Publications (2)

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

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EP19727913.6A Active EP3790665B1 (fr) 2018-05-10 2019-05-09 Appareil de revêtement aérographe automatique et méthode de traitement utilisant ledit appareil

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

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Publication number Priority date Publication date Assignee Title
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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US2438865A (en) * 1946-04-06 1948-03-30 Leonard A Rehard Rapid electric fluid heater
GB791862A (en) * 1953-08-19 1958-03-12 Tanning Equipment Ltd Improvements in or relating to spraying apparatus
US4147923A (en) * 1977-10-14 1979-04-03 Davis Oliver T Electrical filtered air heater
US4433640A (en) * 1980-11-28 1984-02-28 Circle Machine Co., Inc. Rotary sprayers for applying uniform coats to conveyor supported work
CN1225380C (zh) * 2000-09-01 2005-11-02 富士胶片株式会社 感光材料卷的包装方法和装置以及流体加热和供应装置
ITBO20040518A1 (it) * 2004-08-09 2004-11-09 Eurosider S A S Di Milli Ottavio Dispositivo e metodo per la produzione di azoto gassoso in pressione, in particolare destinato alla verniciatura
JP4753603B2 (ja) * 2005-03-29 2011-08-24 日産自動車株式会社 加熱気体供給装置
KR100769639B1 (ko) * 2006-11-30 2007-10-23 (주)혜창 미세한 코팅막을 균일하게 성형하기 위한 스프레이 장치
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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CN104823294B (zh) * 2012-11-23 2017-08-08 阿莫绿色技术有限公司 有机薄膜形成装置及有机薄膜形成方法和利用其的有机薄膜元件的制造方法
CN103759406B (zh) * 2014-01-24 2016-08-31 陈国良 单罐双管体双向电加热装置及空气能即热式热水器
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CN204685364U (zh) * 2015-06-19 2015-10-07 联德(广州)机械有限公司 旋转式喷涂装置
CN105057136A (zh) * 2015-08-25 2015-11-18 中国烟草总公司郑州烟草研究院 一种适应于多种雾化介质的双流体喷嘴雾化实验装置

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WO2019215653A1 (fr) 2019-11-14
BR112020022814A2 (pt) 2021-02-02
CN112384305A (zh) 2021-02-19
EP3790665A1 (fr) 2021-03-17

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