EP3791963A1 - Dispositif de revêtement de composants, tels que des parties de cadre, des éléments de tôlerie ou des parties de profilé - Google Patents

Dispositif de revêtement de composants, tels que des parties de cadre, des éléments de tôlerie ou des parties de profilé Download PDF

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Publication number
EP3791963A1
EP3791963A1 EP20195647.1A EP20195647A EP3791963A1 EP 3791963 A1 EP3791963 A1 EP 3791963A1 EP 20195647 A EP20195647 A EP 20195647A EP 3791963 A1 EP3791963 A1 EP 3791963A1
Authority
EP
European Patent Office
Prior art keywords
powder particles
discharge
powder
container
component
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.)
Granted
Application number
EP20195647.1A
Other languages
German (de)
English (en)
Other versions
EP3791963C0 (fr
EP3791963B1 (fr
Inventor
Andreas Ritterbach
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
Publication of EP3791963A1 publication Critical patent/EP3791963A1/fr
Application granted granted Critical
Publication of EP3791963C0 publication Critical patent/EP3791963C0/fr
Publication of EP3791963B1 publication Critical patent/EP3791963B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/081—Plant for applying liquids or other fluent materials to objects specially adapted for treating 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
    • 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
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying 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
    • 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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/082—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects
    • 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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/087—Arrangements of electrodes, e.g. of charging, shielding, collecting electrodes
    • 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
    • B05B7/14—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 designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1454—Arrangements for supplying particulate material comprising means for supplying collected oversprayed particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B05B1/20—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/36—Outlets for discharging by overflow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
    • B05B14/48—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths specially adapted for particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/90—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth

Definitions

  • the invention relates to a device for coating components, such as frame parts, sheet metal parts or profile parts, with a powder layer that can be produced by means of electrostatically charged powder particles on the earthed components to be coated, comprising a device discharging the powder, the discharge of which with an electrode for charging the powder particles interacts, the component to be coated being arranged on a conveying device via which the component is grounded so that when the charged powder particle hits the component, the adhesive effect is given.
  • the powder In the electrostatic powder spraying process, the powder is fluidized by means of an air stream and transported via a hose to the spray element, where it is electrostatically charged and sprayed onto the substrate, here the component, by means of a nozzle.
  • the charged powder particles are deposited on the grounded substrate by electrostatic attractive forces. Since only part of the sprayed powder reaches the component during the spraying process, the powder that has not been deposited, the so-called overspray, is sucked out of the coating booth by means of a suction system and fed back into the powder container.
  • the spray units for example spray guns
  • the spray units are moved up and down by means of an automatic lifting device in the case of vertically arranged components, with the spray guns being moved back and forth in the case of a horizontal arrangement of the component in order to overlap all areas of the by means of a conveyor device on the Spray organ to be able to coat moving components.
  • a dust cloud is generated at the discharge.
  • a high-voltage cascade In the discharge area, a high-voltage cascade generates the necessary high voltage at the electrode in order to provide an electric field in relation to the component to be coated. In this way the individual powder particles are ionized before they deposit or adhere to the grounded workpiece or component.
  • the components or objects are sprayed in so-called booths, with suction devices also being provided in order to recapture the powder cloud generated by the compressed air.
  • a cabin technology known from the prior art requires a large amount of space with high installation costs.
  • due to the high air volume flows or air flow speeds when the powder is sprayed onto the component not only a powder cloud but also occurring turbulence are generated, which cause layer thickness fluctuations and particle size separation.
  • a major disadvantage of the known coating devices is that, in particular, the high powder conveying speeds that are generated with the spray units, which cause additional air flow turbulence in the spray jet area, which can lead to additional fluctuations in layer thickness.
  • the powder cloud produced also makes it extremely difficult to recover the powder material, since the powder cloud in particular has to be sucked off and captured in order to then filter the powder particle particles out of the air-solids mixture. This requires a recovery device with a cyclone, which is extremely expensive.
  • a coating device which has a transport device, an atomizing device with an outlet for the atomized coating material and an electrical conduction means in the form of fixed wire electrodes that can be connected to high voltage and arranged between the outlet and the transport device.
  • the invention is therefore based on the object of developing a device for coating components, such as components, frame parts, sheet metal parts or profile parts, with a powder layer in such a way that the aforementioned disadvantages are overcome, whereby it should be ensured in particular that the coating is essentially dust-free and is to be carried out uniformly, with the powder material in particular being easily and quickly recyclable, provided that the device can be implemented inexpensively.
  • the advantages achieved with the invention essentially consist in the fact that as a result of a gravity distribution of the powder and as a result of the design of a gravity discharge of the powder, the formation of a powder mist or a powder cloud is restricted as a result. Because the powder falls freely on a surface solely by gravity, a surface curtain consisting of powder is formed, which is only influenced by the fact that the electrodes for the electrostatic charging of certain particles are arranged separately behind the surface curtain. The electrodes electrostatically charge the powder particles that reach the area of the electrodes or fall past the electrode. For the application and adhesive effect, the particles then migrate to the component to be coated in accordance with the field lines that are established.
  • the main advantage of this configuration is that no causal air flow is generated in order to distribute the powder particles to form a cloud in order to shoot the electrified particles at the component to be coated in this way.
  • this takes place exclusively gravitationally through the resulting surface curtain, which is influenced by the electrode located behind it. If a component is moved through the device, the field line horizon is established, in particular due to the grounded component, over which the particles then fly or are attracted to the component to be coated.
  • the device has the advantage that, due to the extremely low level of dust, the particles are quickly deposited on the ground. Feeding the material into the material cycle is therefore much simpler, since in particular no suction with a cyclone separator is required. The recovered material can be fed back into the process by means of simply designed pumps, which is particularly beneficial for the implementation of an inexpensive device.
  • the device consists of a container designed as a dipping basin into which the components to be coated move into and out of the container by means of the conveyor device, the discharge devices for the powder being arranged on the inside on the side walls of the container that are aligned parallel to one another . Independently separated from the Discharge devices are arranged separately and the electrodes are also attached to side walls.
  • so-called field line areas or horizons result, which in particular stimulate the falling powder, which here falls into this field line horizon, to be coated.
  • the container cooperates with a return device which collects the non-adhering powder particles and which conveys the powder back to the discharge devices.
  • the discharge devices and the electrodes in the container are arranged opposite one another on the side walls, for the reason that the component, such as a bicycle frame, can be uniformly powder coated on both sides.
  • the discharge device is designed in such a way that the powder flows or is released from the device under the action of gravity.
  • the discharge device is designed in such a way that it creates a panel curtain formed from the powder material on the side wall of the container.
  • the panel curtain formed from the powder particles runs at a parallel distance to the side wall surface.
  • Behind the panel curtain that is, in the space between the side wall surface and the back of the curtain, at least one electrode is arranged that covers a partial area of the back of the curtain and is designed according to the size of the component to be coated. Due to this design of the integration of the electrodes, there is now the possibility that the electrode components can be tailored accordingly for components of different sizes behind the panel curtain, this also particularly affecting the configuration in the width of the powder curtain.
  • the discharge devices have an antechamber in which a powder quantity supply is stored in front of a discharge distributor.
  • the distributor has a large number of outlet openings through which the powder material can flow freely through displacement under the action of gravity in the surface.
  • the discharge device can be designed with a distributor, for example as a tube, rod or box.
  • the container or immersion basin can have an angled bottom with an outlet in which the uncharged powder particles can be collected for reapplication.
  • a conveyor such as a screw conveyor or a conveyor belt, in the floor area in order to convey the powder particles to an outlet.
  • the powder particles are then put into a Settling device promoted before they are fed back to the discharge devices.
  • the powder material is conveyed by means of a pump that is designed as a displacement pump for transport.
  • the electrodes are advantageously designed as point electrodes, these being attached to the side wall in the form of a rod.
  • Other shapes are also conceivable, which here can be configured accordingly for the component to be coated.
  • the individual electrode consists of a conductive tube or rod element on which point electrodes in the form of needles or tips are arranged distributed over the length, to provide the electrostatic field lines in the device for the component to be coated in relation to the component to be passed through.
  • the Figures 1 and 2 show the device 1 according to the invention in different views
  • the Fig. 1 shows a schematically illustrated device 1 for coating components 2, such as frame parts, sheet metal parts or profile parts, with a powder layer.
  • the device 1 comprises a device 4 which discharges the powder particles 3, the discharge 5 of which interacts with an electrode 6 for charging the powder particles 3.
  • the component 2 to be coated is, as in the Figures 1 and 2 recognizable, arranged hanging on a conveyor 7.
  • the component 2 is earthed via the conveying device, so that when the charged powder particle 3 hits, the adhesive effect on the component 2 is achieved or given, as can be seen from the synopsis of the Fig. 1 , 2 , 3 and 4th results.
  • the device 1 consists of a container 8 designed as a dip basin, into which the component 2 to be coated moves into and out of the container 8 by means of the conveying device 7.
  • the discharge devices 4 for the powder particles 3 are arranged, as is shown in particular in FIG Fig. 2 in the cut view, but also in the Figures 3 and 4th is recognizable.
  • the electrodes 6, which are also attached to the side walls 9 and 10, are arranged separately independently of the discharge devices 4. These are particularly also in the Fig. 2 , but also indicated on the respective side wall 9, 10 in the Figures 3 and 4th , to be recognized or indicated.
  • the individual electrode 6 is shown in detail in FIG Figures 7 and 8th shown in more detail, the electrode 6 being shown here in a plan view and in a sectional side view.
  • the container 8 which is designed as an immersion basin here, interacts with a return device 11 which collects the non-stick powder particles 3 and which conveys the powder particles 3 back to the discharge devices 4.
  • This so-called return device 11 is in the Fig. 1 and also in the Fig. 2 shown, whereby in the Fig. 2 in particular the connection with the discharge devices 4 is shown.
  • a discharge conveyor pump 12 and optionally a feed conveyor pump 13 are provided, which bring about the circulation of the powder material here.
  • the circulation process can also be carried out exclusively by the discharge pump 12.
  • the discharge devices 4 and the electrodes 6 in the container 8 are on the side walls 9 and 10 arranged opposite one another, as shown in particular in FIG Fig. 2 can be clearly seen. This ensures that the component 2 is coated on both sides, so that an all-round coating, here for example a bicycle frame, such as this in FIG Fig. 4 is indicated, can be made.
  • the special feature of the embodiment of the Fig. 6 is that powder particles 3 are discharged over an edge when the antechamber 17 has reached a certain degree of overfilling.
  • the discharge devices 4 in the container 8 are fixed on the side walls 9 and 10 in such a way that they create a sheet curtain 14 formed from powder material on the side wall 9, 10 of the container 8, as shown in FIG Fig. 2 , in the Fig. 3 and in the Fig. 4 is indicated.
  • the surface curtain 14 formed from the powder particles 3 runs at a distance 15 from the side wall surface 16.
  • a component 2 is shown as a bicycle frame, which, due to its structural shape, requires that the electrodes 6 be configured on the side walls 9, 10 in order to obtain the most effective coating here.
  • stick electrodes 6 are indicated there, which are intended to cover the areas of the frame here when driving past. If significantly more compact, smaller components 2 are to be coated, only one electrode 6 may then be required, or in the case of even larger components 2, the number of electrodes 6 on the side wall surface 16 then has to be increased.
  • the discharge device 4 has an antechamber 17 in which a powder supply is stored in front of a discharge distributor 18. This ensures that, due to the storage supply, a certain amount of powder particles 3 is formed within the distributor 18, which as a result of the displacement and under the action of gravity pushes the individual powder particles 3 out of the distributor 18.
  • the distributor 18 can use a plurality of discharge openings 19 or an overflow edge, as in FIG figure 6th shown, have the powder particles 3 emerge giant-shaped in the area, as in the Figures 5 and 6th is indicated.
  • the discharge devices 4 can be tubular, rod-shaped or box-shaped, in particular in the Figure 7 a tubular discharge device 4 is shown.
  • the container 8 has an angled floor pan 20 with an outlet 21 at the lowest point, in which the uncharged powder particles 3 can be collected for reapplication.
  • the configuration of the floor pan 20 different shapes are conceivable, the shape shown only reproducing one example of the possible configuration of the floor pan 20.
  • the powder particles 3 are conveyed into a settling device 22 before they are fed back to the discharge devices 4.
  • the process of circulating the powder material takes place here by means of a pump 12 and, if necessary, with an additional pump 13 which pumps the powder material through the units without pressure by means of displacement.
  • the electrodes 6, which are connected to a high-voltage device 23, are designed as point electrodes or needle electrodes 24, as shown in FIG Figures 8 and 9 can be seen more closely.
  • the point electrodes 24 are attached to the side wall 9, 10 in the form of a rod.
  • the individual electrode 6 here consists of a conductive tube or rod element 25, on which the point electrodes or needle electrodes 24 are arranged distributed over the length.
  • the point or needle electrodes 24 provide the electrostatic field line areas opposite the component 2 passing through in the device 1.

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  • Electrostatic Spraying Apparatus (AREA)
EP20195647.1A 2019-09-16 2020-09-11 Dispositif de revêtement de composants, tels que des parties de cadre, des éléments de tôlerie ou des parties de profilé Active EP3791963B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202019105107.8U DE202019105107U1 (de) 2019-09-16 2019-09-16 Vorrichtung zum Beschichten von Bauteilen, wie beispielsweise Rahmenteile, Blechteile oder Profilteile

Publications (3)

Publication Number Publication Date
EP3791963A1 true EP3791963A1 (fr) 2021-03-17
EP3791963C0 EP3791963C0 (fr) 2023-09-06
EP3791963B1 EP3791963B1 (fr) 2023-09-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20195647.1A Active EP3791963B1 (fr) 2019-09-16 2020-09-11 Dispositif de revêtement de composants, tels que des parties de cadre, des éléments de tôlerie ou des parties de profilé

Country Status (2)

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EP (1) EP3791963B1 (fr)
DE (1) DE202019105107U1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4301764A (en) * 1978-11-21 1981-11-24 Compagnie Europeenne Pour L'equipement Menager "Cepem" Installation for electrostatic deposition of powder on objects
DE19542863A1 (de) * 1995-11-17 1997-05-22 Abb Research Ltd Pulversprüheinrichtung
DE19709786A1 (de) * 1997-03-10 1998-02-12 Gema Volstatic Ag Elektrostatische Pulversprühvorrichtung
WO1999033574A1 (fr) * 1997-12-25 1999-07-08 Nihon Parkerizing Co., Ltd. Dispositif et procede de poudrage
FR2795004A1 (fr) * 1999-06-15 2000-12-22 Atofina Procede de recouvrement d'un objet par un film et appareillage pour la mise en oeuvre de ce procede
JP2002177826A (ja) * 2000-12-12 2002-06-25 Matsuo Sangyo Kk 静電粉体塗装装置
DE69712270T2 (de) 1996-07-10 2002-12-12 Material Sciences Corp Pulverzerstäuber

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3496082A (en) * 1964-10-19 1970-02-17 Ransburg Electro Coating Corp Electrophoretic coating method and apparatus utilizing bath circulation to minimize impurities
DD234263A1 (de) * 1984-10-30 1986-03-26 Glaskunst Lauscha Thuer Veb Verfahren zum elektrokinetischen und/oder elektrostatischen beschichten von gegenstaenden

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4301764A (en) * 1978-11-21 1981-11-24 Compagnie Europeenne Pour L'equipement Menager "Cepem" Installation for electrostatic deposition of powder on objects
DE19542863A1 (de) * 1995-11-17 1997-05-22 Abb Research Ltd Pulversprüheinrichtung
DE69712270T2 (de) 1996-07-10 2002-12-12 Material Sciences Corp Pulverzerstäuber
DE19709786A1 (de) * 1997-03-10 1998-02-12 Gema Volstatic Ag Elektrostatische Pulversprühvorrichtung
WO1999033574A1 (fr) * 1997-12-25 1999-07-08 Nihon Parkerizing Co., Ltd. Dispositif et procede de poudrage
FR2795004A1 (fr) * 1999-06-15 2000-12-22 Atofina Procede de recouvrement d'un objet par un film et appareillage pour la mise en oeuvre de ce procede
JP2002177826A (ja) * 2000-12-12 2002-06-25 Matsuo Sangyo Kk 静電粉体塗装装置

Also Published As

Publication number Publication date
EP3791963C0 (fr) 2023-09-06
EP3791963B1 (fr) 2023-09-06
DE202019105107U1 (de) 2020-12-22

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