EP0792694A2 - Procédé et dispositif pour commander l'alimentation d'une poudre fluidisée à partir d'un réservoir - Google Patents

Procédé et dispositif pour commander l'alimentation d'une poudre fluidisée à partir d'un réservoir Download PDF

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Publication number
EP0792694A2
EP0792694A2 EP97102463A EP97102463A EP0792694A2 EP 0792694 A2 EP0792694 A2 EP 0792694A2 EP 97102463 A EP97102463 A EP 97102463A EP 97102463 A EP97102463 A EP 97102463A EP 0792694 A2 EP0792694 A2 EP 0792694A2
Authority
EP
European Patent Office
Prior art keywords
powder
container
tube
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
EP97102463A
Other languages
German (de)
English (en)
Other versions
EP0792694A3 (fr
EP0792694B1 (fr
Inventor
Gunter Dr. Börner
Josef Wittmann
Johann Dr. Nienburg
Jörg Dr. Sopka
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 EP0792694A2 publication Critical patent/EP0792694A2/fr
Publication of EP0792694A3 publication Critical patent/EP0792694A3/fr
Application granted granted Critical
Publication of EP0792694B1 publication Critical patent/EP0792694B1/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
    • B05B5/16—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
    • 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
    • B05B5/16—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
    • B05B7/1413—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising a container fixed to the discharge device
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/05—Fluidized bed

Definitions

  • the invention relates to a method according to the preamble of claim 1 and a device according to the preamble of claim 2 for controlling the exit of a fluidized solid from a container.
  • the method and the device can generally be used for closing or partially or completely opening an outlet opening on a container for fluidized solid, wherein an increased pressure or ambient air pressure can prevail in the container.
  • the method and the device are particularly suitable for use in powder spraying devices for electrostatic painting.
  • a powder spraying device is described, for example, in the unpublished German patent application P 195 370 89.
  • the structure of this powder spraying device is explained in more detail below with reference to FIG. 1.
  • the powder spraying device has a mechanical locking system for the powder outlet.
  • the invention is therefore based on the object of specifying a method and a device for controlling the outlet of a fluidized solid, the aforementioned disadvantages being to be avoided.
  • the method and the device have the effect that, by introducing closing air into the sampling tube, the powder is pushed back out of the tube into the container and the powder discharge is thereby stopped.
  • a nozzle usually arranged at the outlet is cleaned with the help of the closing air at each spray stop.
  • the mass flow of the fluidized solid is easy to change of the closing air flow controllable.
  • the solids output can also be set to intermediate values between zero and a maximum value by setting appropriate pressure ratios.
  • FIG. 1 shows a powder spraying device 1 already described in application P 195 370 89, 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 on the side of the container 2 and closable with a mechanical 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 an additional impact body 16.
  • 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.
  • 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.
  • FIG. 2 and 3 each show in a schematic diagram the embodiment of a locking system according to the invention for the exit of fluidized powder, which takes the place of the mechanical locking system shown in FIG. 1, FIG. 2 showing a closed state and FIG. 3 the opened state. 1 correspond to the same components.
  • FIG. 2 shows a section of the container 2 with the extraction tube 25 for fluidized powder 8.
  • the jacket of the extraction tube 25 has an opening 50 into which an air tube 51 opens. Closing air L S can be introduced into the air tube 51. The method for controlling the fluid powder outlet and thus the operation of the device shown in FIGS. 2 and 3 is explained below.
  • a closing air pressure p R is established in the air pipe 51.
  • the closing air pressure p R in the extraction tube 25 is greater than the pressure p 3 in the container 2, powder leakage is prevented; ie at a pressure ratio p R / p 3 > 1, the fluid powder 8 is pushed back into the container 2. If the closing air pressure p R in the extraction tube 25 is less than the pressure p 3 in the container 2, that is to say the ratio p R / p 3 ⁇ 1, fluidized powder emerges.
  • a numerical example can further clarify which air pressures are required for closing.
  • a closing air pressure p R of at least 2.1 bar is required in the case of a container pressure p 3 of 2 bar (corresponds to 1 bar overpressure) in order to discharge the powder stop completely.
  • a closing air pressure p R of at least 2.4 bar is required under otherwise identical conditions as mentioned before in order to completely stop the powder output.
  • FIG. 2 shows a state in which a closing air pressure p R that is greater than the fluid bed pressure p 3 is set by appropriately introducing closing air L S into the extraction tube 25. There is no powder leakage.
  • the closing air L S flows partly into the container 2 and partly through the nozzle 11.
  • Fig. 3 shows a state in which the supply of closing air L S is completely shut off and powder can thereby be ejected.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Glanulating (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
EP97102463A 1996-02-20 1997-02-15 Procédé et dispositif pour commander l'alimentation d'une poudre fluidisée à partir d'un réservoir Expired - Lifetime EP0792694B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19606214A DE19606214B4 (de) 1996-02-20 1996-02-20 Verfahren und Einrichtung zur Steuerung des Austritts eines fluidisierten Feststoffs aus einem Behälter
DE19606214 1996-02-20

Publications (3)

Publication Number Publication Date
EP0792694A2 true EP0792694A2 (fr) 1997-09-03
EP0792694A3 EP0792694A3 (fr) 1998-05-27
EP0792694B1 EP0792694B1 (fr) 2003-03-12

Family

ID=7785865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97102463A Expired - Lifetime EP0792694B1 (fr) 1996-02-20 1997-02-15 Procédé et dispositif pour commander l'alimentation d'une poudre fluidisée à partir d'un réservoir

Country Status (6)

Country Link
US (1) US5800876A (fr)
EP (1) EP0792694B1 (fr)
JP (1) JP3987152B2 (fr)
KR (1) KR970061773A (fr)
AT (1) ATE234159T1 (fr)
DE (2) DE19606214B4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004013153A1 (de) * 2004-03-17 2005-10-06 Itw Gema Ag Verfahren und Vorrichtung zum Fördern von Pulver, insbesondere Pulver zum Sprühbeschichten von Gegenständen

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20010654A1 (it) * 2001-03-28 2002-09-28 Ines Urbani Dispositivo per verniciatura elettrostatica ad emissione lineare di polvere attraverso una doppia fenditura di qualsivoglia lunghezza per us
DE10138917A1 (de) 2001-08-08 2003-03-06 Itw Gema Ag Pulversprühbeschichtungsvorrichtung
US7273339B2 (en) * 2003-03-07 2007-09-25 Haden Schweitzer Corporation Powder transport method and apparatus
US6988698B2 (en) * 2004-04-22 2006-01-24 Lucasay Manufacturing Co. Appliance mounting apparatus
BE1015883A3 (fr) * 2004-06-08 2005-10-04 Occhio Procede et dispositif de dispersion de poudres seches.
US20080152437A1 (en) * 2006-12-26 2008-06-26 Illinois Tool Works Inc. Pulverulent material transport
US20080205189A1 (en) 2007-02-27 2008-08-28 Illinois Tool Works Inc. Dense phase pump for pulverulent material
KR101329032B1 (ko) * 2011-04-20 2013-11-14 주식회사 실리콘밸류 다결정 실리콘 제조장치 및 이를 이용한 다결정 실리콘의 제조방법

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2314775A1 (fr) * 1975-06-18 1977-01-14 Inst Francais Du Petrole Appareillage pour former une couche d'un produit pulverulent sur la surface d'un objet
US4165134A (en) * 1977-08-16 1979-08-21 The Continental Group, Inc. Pneumatic powder flow diverting device
FR2521170B1 (fr) * 1982-02-09 1986-11-21 Dietrich & Cie De Procede pour l'emaillage d'objets par pistolage electrostatique
DE3244742C2 (de) * 1982-12-03 1986-07-03 Bergwerksverband Gmbh, 4300 Essen Vorrichtung zum Austragen von Feststoffpartikeln aus einem Behälter, insbesondere einem Wirbelschichtreaktor sowie Verfahren zum Betreiben einer solchen Vorrichtung
HU188492B (en) * 1983-09-28 1986-04-28 Eroemue- Eshalozattervezoe Vallalat,Hu Device for measuring and controlling volume flow of fluidizable powdery or granulat materials
DE3544915A1 (de) * 1985-12-19 1987-06-25 Basf Ag Dosiervorrichtung zum regelbaren einbringen von rieselfaehigen, pulverfoermigen stoffen in unter druck stehende raeume
JPH0615050B2 (ja) * 1986-02-05 1994-03-02 ノードソン株式会社 粉粒体の断続スプレイ塗布方法とそのガン
DE4010914C1 (en) * 1990-04-04 1991-07-11 Wagner International Ag, Altstaetten, Ch Fluidising and convey set=up for electrostatic powder coating appts. - has container pivotable about 180 deg. on frame and with fluidising plate on lid
DE69331148T2 (de) * 1992-12-17 2002-07-11 Nordson Corp., Westlake Pulverauftragesystem für schwer zu handhabende pulver
GB2277469B (en) * 1993-04-27 1996-07-24 Itw Ltd An electrostatic system
DE4325044C2 (de) * 1993-07-26 2002-07-18 Itw Gema Ag Pulverfördervorrichtung, insbesondere für Beschichtungspulver
DE4436919C2 (de) * 1994-10-15 1997-06-05 Boris Petrovic Dr Ing Leonov Einrichtung zur tribostatischen Pulverlackbeschichtung
US5558713A (en) * 1994-10-31 1996-09-24 The Procter & Gamble Company Method and apparatus for forming a pulsed stream of particles for application to a fibrous web
DE19537089A1 (de) * 1995-10-05 1997-04-10 Abb Research Ltd Verfahren und Einrichtung zum Pulversprühen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004013153A1 (de) * 2004-03-17 2005-10-06 Itw Gema Ag Verfahren und Vorrichtung zum Fördern von Pulver, insbesondere Pulver zum Sprühbeschichten von Gegenständen

Also Published As

Publication number Publication date
DE19606214B4 (de) 2006-06-01
EP0792694A3 (fr) 1998-05-27
EP0792694B1 (fr) 2003-03-12
JP3987152B2 (ja) 2007-10-03
US5800876A (en) 1998-09-01
ATE234159T1 (de) 2003-03-15
DE59709463D1 (de) 2003-04-17
JPH09313992A (ja) 1997-12-09
KR970061773A (ko) 1997-09-12
DE19606214A1 (de) 1997-08-21

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