EP0767006A1 - Méthode et dispositif d'alimentation en poudre d'un appareil de revêtement à poudre - Google Patents

Méthode et dispositif d'alimentation en poudre d'un appareil de revêtement à poudre Download PDF

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Publication number
EP0767006A1
EP0767006A1 EP96115512A EP96115512A EP0767006A1 EP 0767006 A1 EP0767006 A1 EP 0767006A1 EP 96115512 A EP96115512 A EP 96115512A EP 96115512 A EP96115512 A EP 96115512A EP 0767006 A1 EP0767006 A1 EP 0767006A1
Authority
EP
European Patent Office
Prior art keywords
powder
chamber
nozzle
air
fluidized
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
EP96115512A
Other languages
German (de)
English (en)
Other versions
EP0767006B1 (fr
Inventor
Gunter Dr. Börner
Hans-Christopher Dr.Rer.Nat. Nienburg
Helmut Prof. Dr. Böhme
Jörg Dr.rer.nat. Sopka
Wolfgang Prof. Dr. Kleber
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.)
ABB Research Ltd Switzerland
Original Assignee
ABB Research Ltd Switzerland
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 ABB Research Ltd Switzerland filed Critical ABB Research Ltd Switzerland
Publication of EP0767006A1 publication Critical patent/EP0767006A1/fr
Application granted granted Critical
Publication of EP0767006B1 publication Critical patent/EP0767006B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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
    • B05B1/16—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 having selectively- effective outlets
    • B05B1/1627—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 having selectively- effective outlets with a selecting mechanism comprising a gate valve, a sliding valve or a cock
    • B05B1/1636—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 having selectively- effective outlets with a selecting mechanism comprising a gate valve, a sliding valve or a cock by relative rotative movement of the valve elements
    • B05B1/1645—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 having selectively- effective outlets with a selecting mechanism comprising a gate valve, a sliding valve or a cock by relative rotative movement of the valve elements the outlets being rotated during selection
    • B05B1/1654—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 having selectively- effective outlets with a selecting mechanism comprising a gate valve, a sliding valve or a cock by relative rotative movement of the valve elements the outlets being rotated during selection about an axis parallel to the liquid passage in the stationary valve element
    • 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
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • 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
    • B05B5/1691—Apparatus to be carried on or by a person or with a container fixed to the discharge device
    • 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
    • B05B7/1413—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising a container fixed to the discharge device
    • 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

Definitions

  • the invention relates to a method for spraying a fluidized powder according to the preamble of claim 1. Furthermore, the invention relates to a device for performing the method.
  • Such a method and an associated device are known from DE-A 12 34 802 and are used, for example, for electrostatic painting.
  • the known device for powder spraying has a first chamber, into which an additional compressed air is introduced, which enters a second chamber via a frit (a pore partition).
  • a powder suspended in air is fed to the second chamber via a line and further swirled with the additional compressed air emerging from the frit and guided in countercurrent.
  • the powder particles emerging from the second chamber are electrically charged with the aid of electrodes which are arranged in the region of a powder / air outlet opening and are connected to a high-voltage generator and which form an electrostatic field.
  • a third feed line is used in the known device, which carries air and has an improving effect on the powder / air output in the powder / air outlet area.
  • the powder / air outlet is always open;
  • the spraying process is controlled by controlling or regulating the flow rates of air and the air / powder mixture.
  • EP-A1-05 74 305 Other devices for powder spraying, but which do not work with a two-chamber arrangement of the type described above, are from the documents DE-C1 35 29 703 and EP-A1-05 74 305 known.
  • the device known from EP-A1-05 74 305 contains a rotating baffle in the air / powder outlet area to improve the powder distribution.
  • the invention is based on the object of specifying a method and a device for powder spraying, by means of which a high, easily controllable ejection rate can be achieved and the powder jet can be specifically oriented.
  • powder is fluidized in a closed container and a powder cloud with relatively no air content emerges.
  • the powder exit rate can advantageously be determined by regulating easily measurable air pressures. No level measurements are required. There is no loss of powder during the switch-on or switch-off process.
  • a powder spraying device 1 which essentially consists of a closed container 2 with a first chamber 3 and a second chamber 4.
  • a compressed air supply line 5 opens into the first chamber 3.
  • Compressed air 7 enters the second chamber 4 through a frit 6.
  • Powder 8 is located in the second chamber 4 and can be filled through a powder supply opening 9.
  • the fluidized powder 8 is removed from the area of the fluid bed through a pipe 25 and is led out through a nozzle 11 arranged laterally on the container 2 and closable with a closing device 13.
  • needles are arranged as corona electrodes 14, which are connected to a high-voltage source (not shown) and which charge the emerging powder particles.
  • the shape of the emerging powder cloud 15 can be determined by the nozzle 11 and additional impact bodies 16, 22 (see also FIGS. 10 to 14).
  • the shape and arrangement of the electrodes 14 can be adapted to this.
  • the air supply can be influenced with the aid of a controllable air inlet valve 17 and the air supply rate can be measured with the aid of a flow meter 18.
  • the outlet opening 10 for fluidizing air is closed off by a controllable outlet valve 19, with which a defined flow resistance can be set.
  • the air pressure p 1 in the first chamber 3 and the air pressure p 4 above the powder bed 8 can be regulated via the valves 17 and 19 with the aid of a control and regulating device, not shown.
  • the pressures p 1 and p 4 are measured using suitable pressure sensors.
  • the ambient air pressure is denoted by p 0 .
  • p 2 With p 2 the air pressure above the frit 6 and thus immediately below the fluidized powder bed is designated.
  • the pressure drop p 1 -p 2 depends on the selected frit 6 and must be taken into account when dimensioning.
  • P 3 denotes the pressure inside the container 2 at the powder outlet opening 11, which can be adjusted by regulating the pressures p 1 and p 4 .
  • the powder is tapped from the interior of the chamber 4 through a pipe 25 attached to the nozzle 11. This ensures a high level of uniformity of the powder output.
  • the powder output rate can be set and controlled very well. High output rates in the range of 100 g / min to 1000 g / min can be achieved.
  • the control behavior of the device is very good, since fluidization and spraying take place in a single device. Since there is no hose connection between the fluidization chamber 4 and the nozzle 11, there are no fluctuations in the powder output and no powder losses when switching on and off.
  • the fluidization can advantageously be operated near the loosening point; then the air / powder ratio of the sprayed powder is minimal. This also ensures a high level of uniformity of the powder output.
  • the shape of the powder cloud 15 is u. a. can be influenced by the shape of the nozzle 11 and the powder outlet area 12.
  • 2 shows a possible design of the nozzle 11 and the outlet area 12 with dimensions given in millimeters by way of example.
  • FIGS. 3 and 4 show sections of the powder spraying device 1, the nozzle 11 shown in FIG. 2 with the closing device 13 being shown in the open or closed position.
  • FIG. 5 shows a top view of a typical cylindrical container 2 with an emerging powder cloud 15.
  • nozzle 11 and the outlet area 12 By designing the nozzle 11 and the outlet area 12 accordingly, a different configuration of the powder cloud 15 can also be achieved, as shown in FIG. 6.
  • Fig. 7 it is shown that the design of the container 2 can also be adapted to a desired shape of the cloud 15.
  • FIGS. 8 and 9 A simple possibility for nozzle design is shown in FIGS. 8 and 9, an orifice 20 with different nozzle openings 21 being shown.
  • a particularly broad and uniform powder cloud can also be achieved with the aid of an impact body (deflector) which - as is shown schematically with reference to FIGS. 10 and 11 - can also be designed as an impact body 22 rotating about an axis 23.
  • An associated drive device 24, including ball bearings 31 and drive belts 32 for the rotating impact body 22 is only indicated in the drawing.
  • a different design of the powder outlet area 12 is shown in FIGS. 10 and 11. In FIG. 11, a jacket 33 is placed around the impact body 22, so that a rotating gap is created, through which the shape of the powder cloud can be additionally influenced.
  • the spray device 1 according to FIG. 1 can be operated in such a way that powder 8 is filled in and then the filling opening 9 is closed. The powder can then be sprayed until a minimum powder level, which is in the region of the nozzle 11, is reached.
  • Figures 12 to 14 show further options for designing the powder outlet area.
  • FIG. 12 shows an arrangement in which both a rotating impact body 22 and rotating high-voltage electrodes 14 are present.
  • the rotatable arrangement of the components 22, 14 is indicated by the ball bearing 31 and the drive belt 32.
  • FIG. 12 shows an additional air duct 30, via which additional air 28 can be fed, which can escape through air nozzles 27 in the powder outlet area 12. With the additional air 28, an additional acceleration of the powder particles and shaping of the powder cloud can be achieved.
  • FIG. 13 shows an arrangement of, for example, a ring-shaped earth electrode 26 in the area between the wall of the container 2 and the impact body 22. At least a part of the ion current flows to the earth electrode 26, as a result of which the powder flow is crossed and an improved charging is achieved.
  • the high-voltage electrodes 14 are attached to the rotating impact body 22. With this arrangement, at least part of the ion current flows from the high-voltage electrode to the earth electrode and the powder particles are forced to cross this ion current, whereby better charging is achieved.

Landscapes

  • Nozzles (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Manufacturing Of Micro-Capsules (AREA)
EP96115512A 1995-10-05 1996-09-27 Méthode et dispositif d'alimentation en poudre d'un appareil de revêtement à poudre Expired - Lifetime EP0767006B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19537089A DE19537089A1 (de) 1995-10-05 1995-10-05 Verfahren und Einrichtung zum Pulversprühen
DE19537089 1995-10-05

Publications (2)

Publication Number Publication Date
EP0767006A1 true EP0767006A1 (fr) 1997-04-09
EP0767006B1 EP0767006B1 (fr) 1999-04-21

Family

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Application Number Title Priority Date Filing Date
EP96115512A Expired - Lifetime EP0767006B1 (fr) 1995-10-05 1996-09-27 Méthode et dispositif d'alimentation en poudre d'un appareil de revêtement à poudre

Country Status (8)

Country Link
US (1) US5839669A (fr)
EP (1) EP0767006B1 (fr)
JP (1) JPH09248494A (fr)
KR (1) KR970020204A (fr)
AT (1) ATE179096T1 (fr)
DE (2) DE19537089A1 (fr)
DK (1) DK0767006T3 (fr)
ES (1) ES2133871T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1502655A3 (fr) * 2003-07-29 2007-11-21 Illinois Tool Works Inc. Cloche de pulvérisation de poudre à électrode secondaire
DE102006032380A1 (de) * 2006-07-13 2008-01-17 Eisenmann Anlagenbau Gmbh & Co. Kg Vorrichtung zum Fördern fluidisierbarer Medien

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DE19606214B4 (de) * 1996-02-20 2006-06-01 Abb Research Ltd. Verfahren und Einrichtung zur Steuerung des Austritts eines fluidisierten Feststoffs aus einem Behälter
US6220791B1 (en) * 1999-03-11 2001-04-24 Board Of Trustees Of The University Of Arkansas Apparatus and method for the aerosolization of powders
DE19934920C1 (de) * 1999-07-20 2000-12-21 Schlick Gustav Gmbh & Co Auf einen Düsenkopf aufsetzbare Düsenkappe
LU90639B1 (de) * 2000-09-18 2002-03-19 Wurth Paul Sa Vorrichtung zum Einleiten von schwer fliessendem Schuettgut in eine Foerderleitung
DE10053295C2 (de) * 2000-10-27 2002-10-31 Eisenmann Lacktechnik Kg Hochrotationszerstäuber zur Aufbringung von Pulverlack
DE10113299A1 (de) * 2001-03-16 2002-09-19 Alstom Switzerland Ltd Verfahren zum Herstellen eines Leiterstabes
DE10138917A1 (de) 2001-08-08 2003-03-06 Itw Gema Ag Pulversprühbeschichtungsvorrichtung
US6988698B2 (en) * 2004-04-22 2006-01-24 Lucasay Manufacturing Co. Appliance mounting apparatus
US20070292218A1 (en) * 2006-06-15 2007-12-20 Robert John Suchey Dynamic blower system, and methods of constructing and utilizing same
JP5014266B2 (ja) 2008-06-11 2012-08-29 モレックス インコーポレイテド 光コネクタ
JP2011022198A (ja) 2009-07-13 2011-02-03 Molex Inc 光コネクタ
DE102010025749B4 (de) * 2010-06-30 2014-11-20 Gema Switzerland Gmbh Pulverversorgungsvorrichtung für eine Pulverbeschichtungsanlage
CN106687218B (zh) 2014-09-04 2019-11-12 胜利创新公司 静电流体输送系统
CN108480079B (zh) * 2018-04-27 2023-08-22 临朐远宏金属制品有限公司 一种可自动清理的供粉中心

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FR2581324A1 (fr) * 1985-05-03 1986-11-07 Porte Michel Dispositif permettant la projection a debit regulier de produits pulverulents de granulometrie tres fine et ses differentes applications notamment pour les produits abrasifs
US4640310A (en) * 1984-12-26 1987-02-03 Nordson Corporation Variable air-piloted air regulator system
DE3925476A1 (de) * 1988-09-07 1990-03-15 Tungsram Reszvenytarsasag Verfahren und vorrichtung zum elektrostatischen beschichten der inneren oberflaeche von lampenkolben
US5018910A (en) * 1986-11-15 1991-05-28 Prazisions-Werkzeuge Ag Process for increasing the quantity of powder dispensed in a powder coating system, as well as powder coating system
WO1994013405A1 (fr) * 1992-12-17 1994-06-23 Nordson Corporation Systeme d'enduction de poudre perfectionne pour des poudres difficiles a manipuler

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4640310A (en) * 1984-12-26 1987-02-03 Nordson Corporation Variable air-piloted air regulator system
FR2581324A1 (fr) * 1985-05-03 1986-11-07 Porte Michel Dispositif permettant la projection a debit regulier de produits pulverulents de granulometrie tres fine et ses differentes applications notamment pour les produits abrasifs
DE3529703C1 (de) * 1985-08-20 1986-08-28 Ransburg-Gema AG, St. Gallen Spruehvorrichtung zur elektrostatischen Pulverbeschichtung
US5018910A (en) * 1986-11-15 1991-05-28 Prazisions-Werkzeuge Ag Process for increasing the quantity of powder dispensed in a powder coating system, as well as powder coating system
DE3925476A1 (de) * 1988-09-07 1990-03-15 Tungsram Reszvenytarsasag Verfahren und vorrichtung zum elektrostatischen beschichten der inneren oberflaeche von lampenkolben
WO1994013405A1 (fr) * 1992-12-17 1994-06-23 Nordson Corporation Systeme d'enduction de poudre perfectionne pour des poudres difficiles a manipuler

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1502655A3 (fr) * 2003-07-29 2007-11-21 Illinois Tool Works Inc. Cloche de pulvérisation de poudre à électrode secondaire
DE102006032380A1 (de) * 2006-07-13 2008-01-17 Eisenmann Anlagenbau Gmbh & Co. Kg Vorrichtung zum Fördern fluidisierbarer Medien
DE102006032380B4 (de) * 2006-07-13 2011-06-01 Eisenmann Anlagenbau Gmbh & Co. Kg Vorrichtung zum Fördern fluidisierbarer Medien

Also Published As

Publication number Publication date
JPH09248494A (ja) 1997-09-22
DK0767006T3 (da) 1999-11-01
US5839669A (en) 1998-11-24
EP0767006B1 (fr) 1999-04-21
KR970020204A (ko) 1997-05-28
ES2133871T3 (es) 1999-09-16
DE19537089A1 (de) 1997-04-10
ATE179096T1 (de) 1999-05-15
DE59601699D1 (de) 1999-05-27

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