EP1115499B1 - Dispositif d'application de revetement en poudre - Google Patents

Dispositif d'application de revetement en poudre Download PDF

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Publication number
EP1115499B1
EP1115499B1 EP99927927A EP99927927A EP1115499B1 EP 1115499 B1 EP1115499 B1 EP 1115499B1 EP 99927927 A EP99927927 A EP 99927927A EP 99927927 A EP99927927 A EP 99927927A EP 1115499 B1 EP1115499 B1 EP 1115499B1
Authority
EP
European Patent Office
Prior art keywords
air
powder
flow
control device
line
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.)
Expired - Lifetime
Application number
EP99927927A
Other languages
German (de)
English (en)
Other versions
EP1115499A1 (fr
Inventor
Hans Peter Michael
Gerald Haas
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.)
Gema Switzerland GmbH
Original Assignee
Gema Switzerland GmbH
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 Gema Switzerland GmbH filed Critical Gema Switzerland GmbH
Publication of EP1115499A1 publication Critical patent/EP1115499A1/fr
Application granted granted Critical
Publication of EP1115499B1 publication Critical patent/EP1115499B1/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
    • 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
    • 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
    • B05B7/1472—Powder extracted from a powder container in a direction substantially opposite to gravity by a suction device dipped into the powder
    • 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 powder coating apparatus according to the preamble of claim 1.
  • a powder spray coating apparatus of this kind is known from EP-B-0 412 289 ( US 5,131,350 ) known.
  • German Patent 1,266,685 is the basic principle of an injector for the pneumatic conveying of coating powder known.
  • EP-B-0 412 289 is an electrostatic Powder coating device known, which contains in a conveying air line and in an additional air line per a pressure regulator and in a common compressed air supply line to the conveying air line and the additional air line, a display device for displaying the total air volume flow.
  • the pressure regulator can also be controlled automatically by a microcomputer.
  • a powder line leading from the injector to a spray device or container a minimum amount of air is required to prevent powder deposits and flow pulsations in the powder line.
  • the powder flow rate should be as constant as possible in the powder line or not fluctuate greatly, regardless of the amount of powder delivered per unit time.
  • Air divider valves which have a throttle valve in the conveying air line and a throttle valve in the additional air line, which are mechanically coupled to each other and are manually or motor-adjustable, to the same extent as one throttle valve is opened, the other Throttling valve is closed further.
  • the valve bodies and their valve seats can be manually adjusted relative to one another to have a default of the amount by which one airflow should be greater or less than the other air flow.
  • the object of the invention is to achieve at all times reproducible settings of the conveying air and the additional air and the amount of powder delivered per unit time, without precision problems in the production occur and without requiring specially trained operators, and also without the need for longer interruptions of Coating operation with changing coating conditions.
  • control device When using an electric stepper motor, no actual value feedback to the control device is required for control or regulation because the control device always automatically knows how many steps the stepper motors have made in one or the other direction of rotation.
  • the control device is a completely electronic Control device, preferably with one or more microprocessors.
  • the control device can be automatically controlled or regulated by a superordinate control station or main computer depending on the objects to be coated, for example, when changing the type of powder, when changing the coating thickness to be generated and / or when changing the clock speed or conveying speed, with which the objects to be coated are transported past a spraying device.
  • the powder coating apparatus comprises an electronic control device 2, which comprises an electric stepper motor 4 for setting a variable flow restrictor 6 in a conveying air line 8 and an electric stepper motor 14 for variably setting an adjustable throttle 16 in an additional air line 18 via electrical lines 10th or 20 electrically controls, in Dependent on a nominal powder flow rate (delivered amount of powder per unit of time) and depending on a nominal total air volume flow (per unit time delivered total air) consisting of conveying air of the conveying air line 8 and additional air of the additional air line 18.
  • an electronic control device 2 comprises an electric stepper motor 4 for setting a variable flow restrictor 6 in a conveying air line 8 and an electric stepper motor 14 for variably setting an adjustable throttle 16 in an additional air line 18 via electrical lines 10th or 20 electrically controls, in Dependent on a nominal powder flow rate (delivered amount of powder per unit of time) and depending on a nominal total air volume flow (per unit time delivered total air) consisting of conveying air of the conveying air line 8 and additional air of the additional air line 18.
  • the electronic control device 2 may also contain one or more computer programs, which set the powder flow rate and the total air volume flow in dependence on the objects to be coated, their conveying or clock speed, the coating thickness to be generated, the type of powder to be used (Grain size, plastic, ceramics) and / or other criteria automatically sets.
  • Such a computer program or such computer programs may be contained instead of in the control device 2 in a higher-level control system or control station 30, which communicates with the control device 2 via a data bus 32 in data exchange.
  • the upstream ends of the conveying air line 8 and the additional air line 18 are connected via a pressure regulator 34 to a common compressed air source 36.
  • the downstream ends of the conveying air line 8 and the additional air line 18 are connected to an injector 38.
  • the conveying air flow of the conveying air line 8 flows from a Injector 40 through a negative pressure region 42 in which it generates a negative pressure and thereby sucks coating powder 46 from a powder container 44, then into a capture channel 48 and from there together with the sucked powder through a powder line 50 to another container or accordingly Fig. 1 to a spraying device 52.
  • the spraying device 52 is preferably of the type which electrostatically charges powders. It may be a manual or automatic spray gun or a rotary atomizer or the like. It sprays the pneumatically conveyed powder 46 onto articles 54 to be coated, which are automatically transported by a transport device 56 past the spray side of the spraying device.
  • a powder suction opening 58 of the injector 38 opens into the vacuum region 42.
  • the container 44 can also be arranged above the injector 38 instead of underneath the injector 38.
  • the downstream end of the additional air line 18 is connected to an additional air opening 60 of the injector 38, from which the additional air flows into the conveying air-powder flow of the catching channel 48.
  • a plurality of additional air lines may be provided, these may open into the catch channel 48 or upstream or downstream thereof in the conveying air-powder flow path.
  • stepper motors 4 and 14 instead of electric stepper motors 4 and 14 as servo motors, other motors may be used, such as servomotors. In all cases, the coordinated control or regulation of the chokes 6 and 16 by their motors is purely electrical by the electronic control device 2.
  • the use of electric stepper motors instead of hydraulic motors has the advantage that the control device 2 at any time "white", as the associated Throttle 6 or 16 is set, since it automatically knows how many steps of the respective stepper motor was rotated in one direction or the other of them.
  • the throttles 6 and 16 may be adjustable or adjustable valves or taps.
  • a display device 60 displays the setpoint values and actual values of the delivery air volume flow, the additional air volume flow, the total volume flow of conveying air and additional air, and the powder flow rate.
  • the delivered amount of powder per unit time (powder rate) is approximately proportional to the per unit time promoted conveying air amount of the conveying air line 8. Therefore, only the conveying air needs to be adjusted with the keys 22 and 23 to set a desired amount of powder.
  • the controller 2 then automatically adjusts the additional air rate by the servomotor 14 and the throttle 16 so that despite the changed delivery rate of the total air flow rate (total air rate) remains at the set value.
  • the delivery air rate and the additional air rate change, with constant air pressure at the pressure regulator 34, only proportional to a change in the flow cross section of their chokes 6 and 16, when the flow resistance downstream of them is very small.
  • the flow resistance is so great that the delivery air rate and the additional air rate do not change linearly to changes in the flow cross sections of the throttles 6 and 16.
  • the non-linear dependence for at least one or more flow resistances is stored diagrammatically such that the control device 2, the throttles 6 and 16 by the servo motors 4 and 14 in response to setpoint specifications, for example on the buttons 22, 23, 24 and 25, non-linearly so that there is a change in the setpoint change linearly the delivery air rate and / or the additional air rate.
  • the spray device 50 is a manual spray gun, on which the buttons 22 and 23, preferably also the buttons 24 and 25 are arranged and manually operated with a finger.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)
  • Seal Device For Vehicle (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)

Claims (3)

  1. Dispositif de revêtement par poudre qui présente un conduit (8) d'air de transport et au moins un conduit (18) d'air supplémentaire qui sont raccordés à un injecteur (38) et pour le transport pneumatique de poudre de revêtement au moyen de l'air de transport du conduit de transport et de l'air supplémentaire du ou des conduits d'air supplémentaire, au moins un étranglement (6) respectif dont la résistance à l'écoulement peut être ajustée par un moteur étant disposé dans le conduit (8) d'air de transport et dans le ou les conduits (18) d'air supplémentaire, un dispositif électronique de commande (2) étant prévu pour ajuster électriquement les étranglements l'un par rapport à l'autre en fonction d'un écoulement volumique global de consigne d'air constitué de l'air de transport et de l'air supplémentaire et en fonction d'un débit de consigne de poudre,
    caractérisé en ce que
    à chaque étranglement (6, 16) est associé un moteur d'ajustement (4, 14) propre commandé par le dispositif de commande (2) pour le réglage de sa résistance à l'écoulement et en ce que pour au moins un mode de réalisation du parcours d'écoulement qui se raccorde aux étranglements (6, 16), une dépendance non linéaire entre une modification de la section transversale d'écoulement d'au moins l'un des étranglements (6, 16) et la modification qui en résulte de son écoulement d'air (8, 18) est conservée sous la forme d'un diagramme dans le dispositif de commande (2) de telle sorte que le dispositif de commande (2) commande de manière non linéaire les étranglements (6, 16) par les moteurs d'ajustement (4, 14) en fonction de valeurs de consigne prescrites de telle sorte qu'en cas de modification de la valeur de consigne de l'écoulement d'air (8, 18) concerné, on obtienne une modification linéaire de la quantité transportée par unité de temps par l'écoulement d'air concerné.
  2. Dispositif de revêtement par poudre selon la revendication 1, caractérisé en ce que les moteurs d'ajustement (4, 14) sont des moteurs électriques pas à pas.
  3. Dispositif de revêtement par poudre selon la revendication 1, caractérisé en ce que les moteurs d'ajustement (4, 14) sont des servomoteurs.
EP99927927A 1998-08-22 1999-06-09 Dispositif d'application de revetement en poudre Expired - Lifetime EP1115499B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19838269A DE19838269A1 (de) 1998-08-22 1998-08-22 Pulverbeschichtungsvorrichtung
DE19838269 1998-08-22
PCT/EP1999/003968 WO2000010727A1 (fr) 1998-08-22 1999-06-09 Dispositif d'application de revetement en poudre

Publications (2)

Publication Number Publication Date
EP1115499A1 EP1115499A1 (fr) 2001-07-18
EP1115499B1 true EP1115499B1 (fr) 2008-03-05

Family

ID=7878443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99927927A Expired - Lifetime EP1115499B1 (fr) 1998-08-22 1999-06-09 Dispositif d'application de revetement en poudre

Country Status (8)

Country Link
US (1) US6443670B1 (fr)
EP (1) EP1115499B1 (fr)
JP (1) JP3421653B2 (fr)
AT (1) ATE387963T1 (fr)
CA (1) CA2341373C (fr)
DE (2) DE19838269A1 (fr)
ES (1) ES2303377T3 (fr)
WO (1) WO2000010727A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10027873C1 (de) * 2000-06-06 2002-02-07 Festo Ag & Co Pneumatische Drucksteuereinrichtung
US20100107562A1 (en) * 2000-06-28 2010-05-06 Weder Donald E Sheets of material having a first printed pattern on an upper surface thereof and a second printed pattern on a lower surface thereof
FR2824283B1 (fr) * 2001-05-03 2004-10-29 Eisenmann France Sarl Procede de regulation du debit de poudre transportee par un flux d'air, et dispositif pour sa mise en oeuvre
AU2002313046A1 (en) * 2002-05-10 2003-12-12 Eisenmann France Sarl Method for regulating flow of powder carried by an air stream, and device therefor
EP1551558A1 (fr) * 2002-10-14 2005-07-13 H. Börger & Co. GmbH Procede et dispositif de transport d'une matiere pulverulente
DE102004052949A1 (de) * 2004-10-29 2006-05-04 Nordson Corp., Westlake Verfahren und Vorrichtung zur Überwachung von Strömungsverhältnissen in einem Leitungsstrang
US20060102075A1 (en) * 2004-11-18 2006-05-18 Saylor Austin A Fluid flow control
US7731456B2 (en) 2005-10-07 2010-06-08 Nordson Corporation Dense phase pump with open loop control
US20130287504A1 (en) * 2012-07-24 2013-10-31 Harry John Gatley Method and Apparatus Accelerate Gases Peripherally
WO2014155655A1 (fr) * 2013-03-29 2014-10-02 株式会社松井製作所 Dispositif de transport de matière et procédé de transport de matière

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH436120A (de) * 1966-06-28 1967-05-15 Gema Ag Pneumatische Fördereinrichtung mit regelbarer Förderleistung
US3625404A (en) 1969-06-02 1971-12-07 Ransburg Electro Coating Corp Apparatus and method for dispensing particulate material
DE3926624A1 (de) 1989-08-11 1991-02-14 Gema Ransburg Ag Elektrostatische pulverbeschichtungseinrichtung
JPH06246196A (ja) 1993-02-22 1994-09-06 I T M Kk 粉体供給装置、静電粉体塗装装置及び粉体流量計測装置
CH688989A5 (de) 1993-03-26 1998-07-15 Ribnitz Peter Vorrichtung zum Fördern von Pulver
US5351903A (en) * 1993-04-06 1994-10-04 Russell Mazakas Electrostatic powder paint gun with trigger control variable voltage
DE69422341T2 (de) 1993-07-15 2000-08-10 Nordson Corp Steuerung für Luftregelung
DE4325044C2 (de) * 1993-07-26 2002-07-18 Itw Gema Ag Pulverfördervorrichtung, insbesondere für Beschichtungspulver
EP0763385B1 (fr) * 1995-09-18 2003-04-23 Elpatronic Ag Procédé de transport d'un matériaux pulvérulent au moyen d'un injecteur

Also Published As

Publication number Publication date
JP2002523217A (ja) 2002-07-30
CA2341373C (fr) 2005-02-01
JP3421653B2 (ja) 2003-06-30
CA2341373A1 (fr) 2000-03-02
US6443670B1 (en) 2002-09-03
ES2303377T3 (es) 2008-08-01
DE59914678D1 (de) 2008-04-17
ATE387963T1 (de) 2008-03-15
EP1115499A1 (fr) 2001-07-18
DE19838269A1 (de) 2000-02-24
WO2000010727A1 (fr) 2000-03-02

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