EP2933024A1 - Installation de peinture par pulvérisation - Google Patents

Installation de peinture par pulvérisation Download PDF

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Publication number
EP2933024A1
EP2933024A1 EP14425042.0A EP14425042A EP2933024A1 EP 2933024 A1 EP2933024 A1 EP 2933024A1 EP 14425042 A EP14425042 A EP 14425042A EP 2933024 A1 EP2933024 A1 EP 2933024A1
Authority
EP
European Patent Office
Prior art keywords
air
pipe
painting
plant according
output
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.)
Withdrawn
Application number
EP14425042.0A
Other languages
German (de)
English (en)
Inventor
Luciano Simonato
Claudio Bettanin
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.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP14425042.0A priority Critical patent/EP2933024A1/fr
Publication of EP2933024A1 publication Critical patent/EP2933024A1/fr
Withdrawn legal-status Critical Current

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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
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/001—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means incorporating means for heating or cooling, e.g. 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
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for particulate materials
    • 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
    • B05B7/0081—Apparatus supplied with low pressure gas, e.g. "hvlp"-guns; air supplied by a fan

Definitions

  • the present invention generally relates to a plant for an industrial spray painting of metal articles and/or other articles made of wood, plastic, aluminum, ceramic, etc. and practically of all paintable surfaces, such as sheets, profiles and the like.
  • the invention relates to an industrial plant for spray painting, which uses air-mixed or air-mix spray guns having an output from which air and paint are released at the same time (for example, the plant cannoy be employed with airless spray guns) and which allows to connect one or more series-connected guns, thus having a considerable saving of the paint and of the working hours, with respect to the known painting systems, and which drastically reduces the emission of harmful substances into the environment, also reducing the replacement of the components, such as air cleaning filters, with respect to the prior art.
  • the article After having applied a paint layer, the article is moved into a baking oven, where polymerization of the paint resin and hardening of the paint occur. Moreover, the surface of the article which must be coated is usually subjected to a prior chemical treatment of degreasing and passivation, so that the paint is able to hold on said surface.
  • Vertical coating devices have a transport system of the articles which includes a mono-rail track, inside of which a biplanar chain runs and the elements which support the articles (through a hole at one of the ends) are hung to said chain; on the other hand, horizontal coating devices are provided for loading the articles on so-called “seedlings", which are hung to special balanced supports, mounted on a conveyor belt.
  • the industrial powder coating or painting is based on the electrostatic attraction occurring between a powder paint particle, which is positively or negatively charged, and the article to be painted, which is grounded.
  • the powder paint particles are electrostatically charged, so that the double effect of the spray action and the electrostatic charge allows to provide a whole coverage of the metal surface to be painted and the best efficiency in the painting use.
  • the particles can be charged, for example, by employing ionized air (the so-called “crown process”) through a high voltage ionizer which is placed inside the spray gun and which injects the ionized air inside a channel, where the paint fluidized powder flows; the spray gun has an electrode near the spray nozzle, so as to electrify the dust particles before said particles are placed on the article's surface, while the article is electrically grounded.
  • ionized air the so-called “crown process”
  • the spray gun has an electrode near the spray nozzle, so as to electrify the dust particles before said particles are placed on the article's surface, while the article is electrically grounded.
  • the paint particles can be charged within a channel of the spray gun by wiping, namely by pushing them according to a spiral-like direction onto the inner walls of the channel of the spray gun.
  • said article is hung on metal supports, which contact other structures or devices that are electrically grounded.
  • An object of the present invention is therefore to provide a plant for spray painting and in particular for painting metal articles, which obviates the above mentioned drawbacks and to provide a spray painting plant which allows a remarkable saving of raw material, with respect to the prior art, thus allowing a reduction of the environmental pollution and maintaining a good coating of the article.
  • Another object of the present invention is to provide a spray painting plant, in particular for painting metal articles, which is efficient and reliable and which is usable, in particular, in powder industrial coating equipments with air-mix or air-mixed spray guns.
  • Another object of the invention is to provide a spray painting plant, in particular for metal articles, which uses air at a low pressure with respect to prior art and which allows to maintain cleaned filters, unlike the prior art spray painting plants.
  • a further object of the present invention is to provide a spray painting plant, which allows a considerable saving of working hours for making the articles, with respect to the known plants.
  • the spray paint plant of the invention comprises an air emission device which is able to let out air of nebulization, which is brought in turn to one or more series-connected spray guns, so as to obtain a considerable saving of paint, as well as reduced pollutant emissions in the environment and a substantial savings of working hours for painting the article, with respect to the prior art.
  • the air emission device requires a reduced maintenance with respect to the prior art, as it works at reduced pressures and maintains a substantial cleaning of all the components.
  • the method for spraying air according to the invention can be used for any coating process that requires the application of the electrostatic principle.
  • the spray painting plant comprises a device 10 which provides atomizing air to a plurality of series-connected air-mixed painting spray guns, i.e. having two different pipes for air and paint and able to let out simultaneously air and paint during a painting operation.
  • the device 10 draws air at the input 11 and provides the atomizing air at the output 12 and from here to the different uses.
  • the device 10 is constituted by a cabinet 13, which can be equipped with a front LCD screen 14, a synoptic frame and a classical frame with a control panel.
  • the device is equipped with emergency push-buttons 15 and with an electric/electronic control circuit 16, below which an air conditioning circuit is provided for conditioning the air which flows at the input 11.
  • the above mentioned air conditioning circuit includes a first pipe 17, which directly connects the input 11 to the output 12 and which is used for flowing air only in emergency conditions (for example, when the air pressure reaches and exceeds prefixed maximum values), and a second pipe 18, in which, in normal operating conditions, the air which is drawed at the input 11 is conveyed.
  • Said second pipe 18 comprises a filtering stage 19 for cleaning the air at the input 11, downstream of which a probe 20 for controlling the air flow and a resistor 21 for heating the air to a maximum operating temperature of 40-45 °C are placed; the resistor 21 is connected to an air de-ionization system 22, which is formed by a transformer 23 and a plurality of needles 24, connected together so as to make a magnetic field able to remove the static charges and additional dirt from the air which circulates at the output of the resistor 21 and inside the de-ionization system 22.
  • control probes 25 are provided downstream the de-ionization system 22 for controlling the air temperature; said control probes 25 are placed at the connection between the second pipe 18 and the direct pipe 17.
  • a control valve unit 26 is also placed at said connection and said valve unit 26 is connected with the electronic circuit 16 and allows the circulation of air inside the pipe 18, thus obtaining a homogeneous temperature of the air both along the pipe 18 and at the output 12, from which atomizing air is drawn for sending it to the users (i.e. to the spray guns, which are series-connected).
  • Said control valve unit 26 is idle when the air is going to flow inside the pipe 18, in order to create a suitable inner fluid turbulence, thus obtaining a suitable homogeneous heating of the whole mass of air which is contained inside the pipe 18.
  • the operation of the plant for spray painting, according to the present invention is substantially the following.
  • buttons 15 and the display screen 14 the user can set a prefixed value of air temperature for painting.
  • the resistor 21 and the de-ionization system 22 provide heating and removal of the static charges and dirt of the air at the input 11, when the probe 20 measures at least one determined value of the airflow passing inside the pipe 18.
  • control valve unit 26 allows an air recirculation, in order to obtain a homogeneous heating of the whole mass of air flowing inside the pipe 18 and at the outlet 12.
  • the device 10 for dispensing atomizing air to the spray painting guns, according to the present invention thus allows a remarkable saving of paint during the treatment of the article, with respect to the prior art, thus obtaining a limited environmental impact and savings in working hours for performing the treatment.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
EP14425042.0A 2014-04-14 2014-04-14 Installation de peinture par pulvérisation Withdrawn EP2933024A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14425042.0A EP2933024A1 (fr) 2014-04-14 2014-04-14 Installation de peinture par pulvérisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14425042.0A EP2933024A1 (fr) 2014-04-14 2014-04-14 Installation de peinture par pulvérisation

Publications (1)

Publication Number Publication Date
EP2933024A1 true EP2933024A1 (fr) 2015-10-21

Family

ID=50897519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14425042.0A Withdrawn EP2933024A1 (fr) 2014-04-14 2014-04-14 Installation de peinture par pulvérisation

Country Status (1)

Country Link
EP (1) EP2933024A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114810A (en) * 1975-10-03 1978-09-19 Senichi Masuda Electrostatic powder painting apparatus
EP1867392A2 (fr) * 2006-06-13 2007-12-19 APO GmbH Massenkleinteilbeschichtung Procédé et dispositif de revêtement superficiel de petites pièces
DE202012012185U1 (de) * 2012-12-20 2014-03-25 Thomas Mayer Druckgasaufbereitungssystem für druckgasbetriebene Beschichtungsanlagen und druckgasbetriebene Beschichtungsanlage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114810A (en) * 1975-10-03 1978-09-19 Senichi Masuda Electrostatic powder painting apparatus
EP1867392A2 (fr) * 2006-06-13 2007-12-19 APO GmbH Massenkleinteilbeschichtung Procédé et dispositif de revêtement superficiel de petites pièces
DE202012012185U1 (de) * 2012-12-20 2014-03-25 Thomas Mayer Druckgasaufbereitungssystem für druckgasbetriebene Beschichtungsanlagen und druckgasbetriebene Beschichtungsanlage

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