(19)
(11)EP 2 307 149 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
04.09.2013 Bulletin 2013/36

(21)Application number: 09802462.3

(22)Date of filing:  24.07.2009
(51)International Patent Classification (IPC): 
B05B 15/12(2006.01)
(86)International application number:
PCT/EP2009/005629
(87)International publication number:
WO 2010/012505 (04.02.2010 Gazette  2010/05)

(54)

POWDER PAINTING CABIN

PULVERBESCHICHTUNGSKAMMER

CABINE POUR PEINTURE EN POUDRE


(84)Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

(30)Priority: 29.07.2008 IT MI20081392

(43)Date of publication of application:
13.04.2011 Bulletin 2011/15

(73)Proprietor: Lasa Impianti s.r.l.
Monza e Brianza (MB) (IT)

(72)Inventor:
  • BORTOLATO, Giovanni
    I-20841 Carate Brianza (MB) (IT)

(74)Representative: Martegani, Franco 
Patent Attorney Via Carlo Alberto, 41
20052 Monza (Milano)
20052 Monza (Milano) (IT)


(56)References cited: : 
WO-A-2007/035656
US-A- 5 690 995
US-B1- 6 187 098
DE-A1- 19 524 327
US-A1- 2002 050 245
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description


    [0001] The present invention relates to a painting cabin using powders, equipped with a perfected automatic cleaning system.

    [0002] Various types of powder painting cabins tending to have a perfected automatic cleaning system which allows a rapid change of colour, are known to experts in the field.

    [0003] Cabins are known where the powder residues are eliminated by means of damp sponges, assembled on a framework having the profile of a cabin and translated from one side to the other.

    [0004] Axially rotating cylindrical cabins equipped with cleaning doctor blades, cylindrical cabins having a vertical axis with cleaning of the bottom by means of compressed air nozzles, cabins with a vibrating floor, cabins with a sucked moving belt and many others, are also known.

    [0005] A powder painting cabin of the known type is described and illustrated for example in EP 1656998 B1.

    [0006] According to patent documents US 6187098, US 5690995 and DE 19524327 A1, the disclosed powder painting cabins are of the type comprising a mantle closed above by a roof and below by a base, a passage in the mantle through which the items to be painted pass, passages for retractable powder-supplier elements, and an air suction duct of the cabin. Inside the mantle there is a movable septum between a lowered position close to the base and a raised position close to the roof, the two lowered and raised positions defining, with the mantle, roof and base, peripheral passages for the air sucked through the duct.

    [0007] These plants are complex, cumbersome, costly, difficult to use, and in any case require further manual final cleaning operations, after the automatic operations.

    [0008] The average colour-change time in the known systems indicated above generally varies from 10 to 20 minutes.

    [0009] In addition, environmental hygiene regulations are becoming increasingly stricter and tend to avoid manual cleaning operations in the presence of powders and chemical products.

    [0010] An objective of the present invention is to overcome the drawbacks of the known art and in particular to:
    • completely avoid manual cleaning operations;
    • avoid powder dispersions in the environment;
    • allow a colour change in a time of less than 5 minutes;
    • produce constructively simpler cabins; and
    • reduce the cabin maintenance to the minimum.


    [0011] The above objective is achieved by a cabin having the characteristics indicated in the main claim and enclosed sub-claims.

    [0012] The structural and functional characteristics of the cabin according to the invention, and its advantages with respect to the known art, will appear more evident from the following description referring to the enclosed schematic drawings, which illustrate practical embodiment examples of the same invention.

    [0013] In the drawings:
    • figure 1 is a vertical section illustrating an example of a cabin produced according to the principles of the present invention in the operative painting phase of an item;
    • figure 2 is a vertical section illustrating the cabin of figure 1 in the automatic cleaning phase;
    • figure 3 is a plan view of the cabin of figures 1, 2; and
    • figure 4 is a scheme of the moving system of the moveable cleaning septum (not forming part of the present invention).


    [0014] With reference to the drawings, an example of a painting cabin with the use of powders produced according to the invention is indicated as a whole with 10 and can have, for example, a cylindrical form, but also other different forms suitable for the purpose, for example polygonal. The cabin 10 is structurally made up of a mantle 11 with a roof (12) and a bottom (base) 13, both conical.

    [0015] As can be clearly seen in figures 1,3, the cabin 10 has a diametric passage 14 which lies on a plane passing through the axis A with a vertical symmetry of the cabin itself.

    [0016] The item to be painted 15 passes through said passage 14, which is carried by a conveying system of the known type schematized with 16.

    [0017] As shown in the plan of figure 3, said passage 14 is equipped with closing doors 17 of the cabin during the cleaning phase.

    [0018] 18 indicates elements of the known type for supplying the painting powder, which are retractably introduced inside the cabin 10 through opposite diametric passages 19 situated in the mantle 11.

    [0019] Said passages 19 lie on a plane passing through the axis A of the cabin, which is perpendicular to the plane on which the passage 14 lies. The passages 19 are provided with respective closing systems each comprising a vertical rolling shutter 20 consisting of a tape made of plastic material pulled between motorized terminal winding rolls 21 and driven to translate vertically upwards and downwards (figure 4).

    [0020] According to the invention, between the shutters 20 a septum 22 is also fixed in 42, which, in the example shown, has a biconical configuration, which is also consequently driven to vertically translate upwards and downwards inside the cylindrical cabin 10.

    [0021] Above said septum 22 there are also motorized arms 24 rotatingly hinged in 23, equipped with ejection nozzles 25 of cleaning compressed air.

    [0022] As can be clearly seen from figure 1 of the drawings, the septum 22, in a lowered position, defines, with the bottom 13 and mantle 11, a narrow annular passage 26 through which the air present inside the cabin 10 is sucked, according to the arrows 27, through a suction duct 30 connected to sucking means (not shown).

    [0023] The cabin 10 is thus kept in depression.

    [0024] The functioning of the cabin according to the invention is clear from the above description with reference to the figures and is briefly the following.

    [0025] The cabin in the painting phase is in the position of figure 1.

    [0026] The biconical septum 22 is lowered close to the opposite bottom 13, consequently the width of the annular passage defined 26 and the divergence of the opposite walls 28, 29 of the bottom 13 and septum 22 are such as to create a Venturi effect which significantly accelerates the stream of air sucked in the direction of the arrows 27 through the suction duct 30.

    [0027] In the painting phase, the compressed air ejection nozzles 25 can also be functioning.

    [0028] At the end of the painting phase, the powder-supply elements 18, moveable in the directions of the arrow 40, are extracted from the cabin and the diametric passage 14 is closed by means of the doors 17, all with air suction and the nozzles 25 functioning.

    [0029] The movement system of the biconical septum 22, is also put into function, which sweeps the cabin vertically, upwards and downwards, in the directions of the arrow 41 (figure 2), thus effecting an automatic and complete cleaning of all the internal walls of the cabin, comprising the roof 12. As already explained, the same movement system of the disk entrains the taped shutter 20 closing the passages 19 of the powder-supply elements 18.

    [0030] At the end of the above automatic cleaning phase of all the internal surfaces of the cabin - a simple and rapid cleaning, and without any manual intervention - the same cabin is ready for the application of a new colour, different from the previous one.

    [0031] The objective mentioned in the preamble of the description is thus achieved.

    [0032] The protection scope of the invention is defined by the following claims.


    Claims

    1. A powder painting cabin (10) comprising : a mantle (11) closed above by a roof (12) and below by a base (13); a passage (14) in said mantle (11) through which the items to be painted (15) pass; passages (19) for retractable powder-supplier elements (18); an air suction duct (30) of the cabin (10); a septum (22) movable inside said mantle (11) between a lowered position close to said base (13) and a raised position close to said roof (12), said two lowered and raised positions defining, with the mantle (11), roof (12) and base (13), peripheral passages (26) for the air sucked through the duct (30); characterized in that said septum (22) has a biconical configuration, and that said roof (12) and base (13) have a conical configuration.
     
    2. The cabin according to claim 1, characterized in that interspaced facing surfaces (28, 29) of the base (13) and septum (22) respectively, are divergent, thus creating a venturi effect in the sucked air.
     
    3. The cabin according to claim 2, characterized in that said interspaced facing surfaces (28, 29) are conical.
     
    4. The cabin according to claim 1, characterized in that the upper surface of said septum (22) is equipped with rotating arms (24) carrying compressed air ejection nozzles (25).
     


    Ansprüche

    1. Pulverbeschichtungskabine (10), mit: einem Mantel (11), der oben durch ein Dach (12) und unten durch eine Basis (13) geschlossen ist; einem Durchgang (14) in dem Mantel (11), durch den die zu beschichtenden Gegenstände (15) gelangen; Durchgänge (19) für zurückziehbare Pulverlieferelemente (18); ein Luftsaugrohr (30) der Kabine (10); eine Trennwand (22), die in dem Mantel (11) zwischen einer abgesenkten Position nahe der Basis (13) und einer angehobenen Position nahe dem Dach (12) bewegbar ist, wobei die beiden abgesenkten und angehobenen Positionen mit dem Mantel (11), dem Dach (12) und der Basis (13) Umfangsdurchgänge (26) für die durch das Rohr (30) gesaugte Luft definieren;
    dadurch gekennzeichnet, dass
    die Trennwand (22) eine doppelkonische Konfiguration besitzt, und dass das Dach (12) und die Basis (13) eine konische Konfiguration besitzen.
     
    2. Kabine nach Anspruch 1,
    dadurch gekennzeichnet, dass
    beabstandete zueinander weisende Flächen (28, 29) der Basis (13) bzw. der Trennwand (22) divergent sind, wodurch eine Venturi-Wirkung in der gesaugten Luft erzeugt wird.
     
    3. Kabine nach Anspruch 2,
    dadurch gekennzeichnet, dass
    die beabstandeten zueinander weisenden Flächen (28, 29) konisch sind.
     
    4. Kabine nach Anspruch 1,
    dadurch gekennzeichnet, dass
    die obere Fläche der Trennwand (22) mit rotierenden Armen (24) ausgestattet ist, die Druckluftausstof3düsen (25) tragen.
     


    Revendications

    1. Cabine pour peinture en poudre (10) comprenant : une enveloppe extérieure (11) fermée sur le dessus par un toit (12) et sur le dessous par une base (13) ; un passage (14) dans ladite enveloppe extérieure (11) par lequel passent les objets à peindre (15) ; des passages (19) pour des éléments d'alimentation en poudre rétractables (18) ; un conduit d'aspiration d'air (30) de la cabine (10) ; une cloison (22) mobile à l'intérieur de ladite enveloppe extérieure (11) entre une position abaissée proche de ladite base (13) et une position élevée proche dudit toit (12), lesdites deux positions, abaissée et élevée, définissant, avec l'enveloppe extérieure (11), le toit (12) et la base (13), des passages périphériques (26) pour l'air aspiré par le conduit (30) ; caractérisée en ce que ladite cloison (22) a une configuration biconique, et en ce que ledit toit (12) et ladite base (13) ont une configuration conique.
     
    2. Cabine selon la revendication 1, caractérisée en ce que des surfaces en vis-à-vis espacées (28, 29) respectivement de la base (13) et de la cloison (22) sont divergentes, créant ainsi un effet venturi dans l'air aspiré.
     
    3. Cabine selon la revendication 2, caractérisée en ce que lesdites surfaces en vis-à-vis espacées (28, 29) sont coniques.
     
    4. Cabine selon la revendication 1, caractérisée en ce que la surface supérieure de ladite cloison (22) est équipée de bras rotatifs (24) portant des buses d'éjection d'air comprimé.
     




    Drawing

















    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description