EP1104334A1 - Dispositif d'application de revetement en poudre - Google Patents

Dispositif d'application de revetement en poudre

Info

Publication number
EP1104334A1
EP1104334A1 EP99927926A EP99927926A EP1104334A1 EP 1104334 A1 EP1104334 A1 EP 1104334A1 EP 99927926 A EP99927926 A EP 99927926A EP 99927926 A EP99927926 A EP 99927926A EP 1104334 A1 EP1104334 A1 EP 1104334A1
Authority
EP
European Patent Office
Prior art keywords
powder
air
control device
throttle
conveying
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
EP99927926A
Other languages
German (de)
English (en)
Other versions
EP1104334B1 (fr
Inventor
Felix Mauchle
Gerald Haas
Hans Peter Michael
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 EP1104334A1 publication Critical patent/EP1104334A1/fr
Application granted granted Critical
Publication of EP1104334B1 publication Critical patent/EP1104334B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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

Definitions

  • the invention relates to a powder spray coating device according to the preamble of claim 1.
  • Such a powder spray coating device is known from EP-A-0 686 430.
  • a powder conveying device with an electronic control device which, depending on a setpoint for the amount of powder to be conveyed per unit of time and a setpoint for the total amount of air to be conveyed per unit of time, which is used for conveying the powder is required, manipulated variable signals for Pressure regulators are generated which, depending on this, regulate the supply of conveying air and additional air to an injector.
  • the control signals are considered as setpoints by the regulators and used as a function of an actual value of the conveying air or the additional air to regulate this conveying air or the additional air.
  • Flow regulators can be used instead of pressure regulators.
  • a pneumatic powder conveying device in which 2 injectors are provided, of which the main injector is located at the downstream end and an auxiliary injector is located at the upstream end of a powder suction tube.
  • Air dividers are known from US-A-3 625 404 and DE-A-44 09 493, which contain a throttle valve in a conveying air line and a throttle valve in an additional air line, which mechanically interconnect are coupled. As the one is opened, the other is closed.
  • the object of the invention is to achieve an accurate and stable control of the pneumatically conveyed powder flow as a function of a manually or automatically predeterminable setpoint for the powder quantity to be conveyed per unit time, without the need for expensive pressure regulators or volume flow regulators.
  • the invention provides a structurally simple and inexpensive device which enables automatic and precise regulation of a powder-air flow, which enables a stable, pulsation-free powder-air flow from start to shutdown.
  • Value terms such as setpoint, actual value and / or manipulated value used in the description have the meaning of a value point or a value range, depending on the desired design of the device. But even at a value point, tolerance-dependent fluctuations in value are still within the scope of the invention.
  • Fig. 1 shows a powder spray coating device according to the Invention with an injector in axial section and a powder suction pipe in vertical section.
  • the powder spray coating device according to the invention shown in FIG. 1 contains a powder-air channel 2, an injector 4 as a fluid conveyor, which has an injector nozzle 6 which is essentially axially directed into the powder-air channel 2, and a powder suction channel 8, which is connected in terms of flow to a vacuum chamber 10 of the injector 4.
  • the vacuum chamber 10 is located between the injector nozzle 6 and the powder-air channel 2.
  • a conveying air jet 7, driven by the injector nozzle 6 into the powder-air channel 2, of a compressed air source 12 sucks powder 16 from a powder container 14 through the powder suction channel 8 into the Vacuum chamber 10, in which the powder mixes with the conveying air jet and then flows together with it through the powder-air channel 2.
  • the compressed air source 12 is connected in terms of flow to the injector nozzle 6 via a compressed air line 20.
  • the compressed air line 20 contains a variable throttle 18, the flow resistance (e.g. flow cross-section) by a servomotor 19 connected to it as a function of a setpoint for the volume of conveyed air conveyed per unit of time and / or a setpoint for the quantity of powder conveyed per unit of time an electronic control device 21 is controllable.
  • the downstream end part 22 of the powder-air channel 2 shown in FIG. 1 can be designed as an atomizing nozzle or via a hose with a spray device for spraying of the powder on an object to be coated.
  • the powder suction channel 8 extends through an immersion tube 24, which is immersed vertically in the powder 16 of the powder container 14.
  • An upper end section 26 of the powder suction channel 8 has an enlarged flow cross-section relative to the upstream channel section, which is connected to the vacuum chamber 10 and, together with this, forms a vacuum area in which the conveying air jet 7 of the injector nozzle 6 generates an essentially homogeneous vacuum or vacuum.
  • the vacuum region 10, 26 is connected or connectable in terms of flow to the outside atmosphere 32 through a measuring channel 30, which is provided with an adjustable flow restrictor 34.
  • the negative pressure or vacuum prevailing in the negative pressure region 10, 26 draws air from the outside atmosphere 32 through the flow throttle 34, throttled through the measuring channel 30.
  • the measuring channel 30 is provided with a measuring device 36 which, depending on the air flowing through the measuring channel 30 from the outside atmosphere 32 into the negative pressure region 10, 26, generates a measuring signal on a signal line 38 which is a measure of the time through the measuring channel 30 flowing air and thus also a measure of the amount of powder conveyed through the powder-air channel 2 per unit of time.
  • the measurement signal can be an electrical, pneumatic or hydraulic signal and, accordingly, its signal line 38 can also be an electrical, pneumatic or be hydraulic line, which is functionally connected to the control device 21.
  • the downstream end 42 of the measuring channel 30 is preferably connected to the vacuum chamber 10 in terms of flow.
  • this end section 26 is connected to the downstream end section 26 of the powder suction channel 8 in terms of flow, this end section having a cross section which is so large that essentially the same vacuum or vacuum prevails in it as in the vacuum chamber 10, so that this end section 26 can be regarded as part of the vacuum chamber 10.
  • the measuring device 36 is preferably a flow measuring device which generates the measuring signal as a function of the amount of outside air flowing through the measuring channel 30 per unit time.
  • the measuring device 36 is a pressure drop measuring device which generates the measuring signal on the signal line 38 as a function of a pressure drop in the outside air flowing through the measuring channel 30.
  • the air pressure in the measuring channel 30 need only be measured at a measuring point downstream of the flow restrictor 34, since this can be related to the pressure of the outside air at an outside atmosphere inlet 32. If the measuring channel 30 has a capillary-like narrow cross section, no additional flow restrictor 34 is required.
  • a pressure drop relative to the pressure of the outside atmosphere can be measured in the same way in the measuring channel 30 downstream of its outside atmosphere inlet '32.
  • the outside atmosphere is throttled with the vacuum chamber 10 in Flow connection is established so that the vacuum in the vacuum chamber 10 is not adversely reduced or influenced by the outside atmosphere.
  • the amount of powder conveyed per unit of time essentially depends on the conveying air rate. Another criterion is the total amount of air conveyed per unit of time, which is conveyed together with the powder through the powder-air line 2. If this total amount of air is less than the amount of air required to convey the powder through the powder-air channel 2 without causing powder deposits, then additional air must be added to the flow rate in the powder-air channel 2 increase. If required, the additional air can be conducted from the compressed air source 12 via an additional air line 43 at an additional air inlet 46 downstream of the vacuum chamber 10 into the powder-air channel 2. In the additional air line 43 there is a second variable throttle 44, the flow resistance (e.g.
  • additional compressed air can be conducted into the vacuum region 10, 26 to influence the vacuum.
  • the vacuum or negative pressure prevailing in the vacuum chamber 10 is not absolutely constant and fluctuates even if the delivery air counters of the injector nozzle 6 and the additional air rate in the additional air inlet 46 and the powder level 48 in the powder container 14 are kept constant.
  • Such uncontrolled fluctuations in the vacuum in the vacuum chamber 10 also undesirably lead to fluctuations in the amount of powder conveyed per unit of time in the powder-air channel 2.
  • a compensating air inlet 56 for example in the form of a second injector, is arranged at the upstream start, which is axially arranged at a small distance from the upstream beginning 58 of the powder outlet channel 8 and through a second vacuum chamber 60 formed therebetween, compensating air axially into the Powder suction duct 8 blows.
  • the compensation air is fed to the second atomizer nozzle from the compressed air source 12 via a third variable flow restrictor 62 in a compressed air line 64 and via a compensation air duct 66.
  • the powder suction duct 8 and the compensating air duct 66 are located axially parallel in the immersion tube 24, in the lower end section of which the second injector nozzle 56 is also arranged.
  • the powder inlet for the powder suction channel 8 is formed by one or more powder inlet openings 68, which extend through the dip tube 24 through the dip tube outer surface 70 and thus the powder 16 located in the powder container 14 with the second vacuum chamber 60 of the second injector 72 connect in terms of flow.
  • the flow resistance (for example the flow cross section) of the third variable throttle 62 can be fixed or automatically or preferably set or regulated automatically by the control device 21 by means of a servomotor 63 connected to it in terms of drive depending on other criteria (powder rate, conveying air rate and / or additional air rate) become.
  • the regulating device 21 regulates the supply of the conveying air, the additional air and / or the compensating air as a function of the measurement signal of the measuring line 38 and as a function of the setpoint or setpoints of the various compressed air types via the throttles 18, 44 and 62.
  • the powder container 14 is preferably designed such that the powder 16 contained in it hovers in an air stream, the air of which flows through a perforated container bottom 74 into the interior of the container. A much smaller amount of air per unit time is introduced into the powder stream from the compensating air inlet 56 than with the first injector nozzle 6.
  • the compensating air from the compensating inlet 56 can, but does not need to draw powder from the powder container 14 in the second vacuum chamber 60.
  • the compensating air is supplied through this inlet 56 with a small constant amount per unit of time and thereby has a stabilizing effect on the pressure fluctuations in the powder suction channel 8 described above.
  • the compensating air of the compensating air inlet 56 makes the fluctuations mentioned more frequent (shorter and faster) and with respect to them Amplitude smaller. As a result, the controller setting times of the control device 21 are attempted to compensate for the fluctuations mentioned, much shorter. In trials, the standard setting times could be reduced to a third.
  • the electronic control device 21 preferably contains one or more microcomputers with computer programs in the hardware or software for executing the described methods.
  • the control device 21 has a powder setpoint input 80 for manual or automatic input of a fixed or variable setpoint for the powder quantity “m” to be conveyed per unit of time, for example in grams / hour (g / h); a total air setpoint input 81 for manual or automatic input of a fixed or variable setpoint for the total air "GV" of the total air volume (air volume flow) to be flowed through the powder-air duct 2, consisting of conveying air from the conveying air line 20, the additional air from the additional air line 43 and the equalizing air from the equalizing air line 64; a high voltage setpoint input 82 for manual or automatic input of a high voltage value for a high voltage for electrostatically charging the powder to be sprayed; and optionally a setpoint input 83 for the equalizing air volume "AV" of the equalizing air inlet 56 supplied per unit of time.
  • a powder setpoint input 80 for manual or automatic input of a fixed or variable setpoint for the powder quantity “m” to be conveyed per unit of time, for
  • the powder to be sprayed can be electrostatically charged in a known manner by electrodes.
  • the amount of equalizing air of the equalizing air inlet 56 can, but often does not need, to be taken into account in the operation of the control device 21 since its amount is much smaller than the amount of conveying air can be set to a fixed value or can be regulated according to the invention by means of an adjustable throttle 62 by a separate servomotor 63 by the control device 21 as a function of other values, for example the powder setpoint "m" and / or one of the air setpoints.
  • control device 21 stored in the form of stored data or data programs, how much conveying air and how much additional air are to be supplied via the conveying air line 20 and via the additional air line 43 to the injector when a specific powder target value “m” is set, while observing the target value for the Total air volume "GV".
  • a diagram is drawn in the control device 21 as an example in FIG. 1, which shows that for any set powder target value “m”, depending on the predetermined total air volume target value “GV”, a specific target value for the conveying air “ FV ".
  • the control device determines a difference, which is the setpoint value for the additional air of the additional air line 43. even if the compensating air of the compensating air line 64 is taken into account by the control device 21 in the total air quantity “GV”, as is the case in the exemplary embodiment shown.
  • the control device 21 generates control values on electrical lines 85, 86 and 87 for the control motors 19, 45 and / or 63. Each variable throttle is assigned its own control motor.
  • sensors 89, 90 and / or 91 are arranged downstream of the throttles 18, 44 and / or 62 and measure the actual values of the relevant conveying air, additional air and / or compensating air in the form of pressures, speed and / or volume and supply a corresponding actual value signal to the control device 21.
  • the control device 21 generates control signals on the electrical lines 85, 86 and / or 87 of the servomotors 19, 45 and / or 63 as a function of the setpoint values that are predefined and these actual values.
  • the amount of powder conveyed per unit of time (powder rate) is approximately proportional to the amount of conveying air conveyed per time unit of the conveying air line 20. Therefore, only the conveying air needs to be adjusted in order to set a desired amount of powder.
  • the control device 21 then automatically adjusts the additional air rate by means of the servomotor 45 and the throttle 44 in such a way that the total air volume flow (total air rate) remains at the set value despite the changed conveying air rate.
  • the non-linear dependency for at least one or more flow resistances is stored diagrammatically in the control device 21 in such a way that the control device 21 controls the throttles 18 and 44 by the actuators 19 and 45 controlled in a non-linear manner as a function of setpoint specifications in such a way that there is a linear change in the conveying air rate and / or the additional air rate for changing the setpoint value.

Landscapes

  • Nozzles (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Manufacturing Of Micro-Capsules (AREA)

Abstract

L'invention concerne un dispositif d'application de revêtement en poudre qui comporte un dispositif de régulation électroélectronique (21), servant à la régulation de courants d'air (20, 43) dirigés vers un injecteur (4), en fonction de valeurs théoriques (m) concernant la quantité de poudre à refouler par unité de temps, et en fonction d'une valeur théorique (GV) relative à la quantité d'air totale s'écoulant à travers l'injecteur, cela au moyen d'étranglements (18, 19, 44, 45) pouvant être réglés par moteur, de préférence également en fonction de valeurs réelles (89, 90) des courants d'air (20, 43) régulés.
EP99927926A 1998-08-22 1999-06-09 Dispositif d'application de revetement en poudre Expired - Lifetime EP1104334B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19838276A DE19838276A1 (de) 1998-08-22 1998-08-22 Pulver-Sprühbeschichtungsvorrichtung
DE19838276 1998-08-22
PCT/EP1999/003967 WO2000010726A1 (fr) 1998-08-22 1999-06-09 Dispositif d'application de revetement en poudre

Publications (2)

Publication Number Publication Date
EP1104334A1 true EP1104334A1 (fr) 2001-06-06
EP1104334B1 EP1104334B1 (fr) 2003-11-05

Family

ID=7878448

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99927926A Expired - Lifetime EP1104334B1 (fr) 1998-08-22 1999-06-09 Dispositif d'application de revetement en poudre

Country Status (8)

Country Link
US (1) US6598803B1 (fr)
EP (1) EP1104334B1 (fr)
JP (1) JP3426215B2 (fr)
AT (1) ATE253411T1 (fr)
CA (1) CA2341221A1 (fr)
DE (2) DE19838276A1 (fr)
ES (1) ES2211105T3 (fr)
WO (1) WO2000010726A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7607451B2 (en) 2004-09-02 2009-10-27 Weitmann & Konrad Gmbh & Co. Kg Device and method for the production of a powder-air mixture

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GB0100756D0 (en) 2001-01-11 2001-02-21 Powderject Res Ltd Needleless syringe
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
SE525718C2 (sv) * 2002-04-11 2005-04-12 Eltex Sweden Ab Anordning vid ett munstycke för reglering av en gas eller vätska
ATE375208T1 (de) * 2002-05-10 2007-10-15 Eisenmann Anlagenbau Gmbh & Co Verfahren und einrichtung zur regelung der pulvermenge in einem trägergas
US7418832B2 (en) * 2003-10-21 2008-09-02 William R Ferrono Portable mister for adjusting ambient temperature
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DE102005007242A1 (de) * 2005-02-17 2006-08-24 Itw Gema Ag Druckluft-Drosselvorrichtung und Pulversprühbeschichtungsvorrichtung
FR2892647B1 (fr) 2005-10-28 2008-02-22 Turbomeca Appareil de pulverisation
EP1958899B1 (fr) * 2007-02-16 2013-08-21 J. Wagner AG Dispositif d'alimentation de fluide
GB0708758D0 (en) 2007-05-04 2007-06-13 Powderject Res Ltd Particle cassettes and process thereof
WO2009004744A1 (fr) * 2007-07-04 2009-01-08 Ga-Rew Corporation Canon à jet de fluide
DE102007049169A1 (de) 2007-10-13 2009-04-16 Itw Gema Gmbh Pulversprühbeschichtungs-Steuergerät und seine Kombination mit einer Pulverfördervorrichtung oder mit einer Pulversprühbeschichtungsvorrichtung
WO2011034370A2 (fr) * 2009-09-18 2011-03-24 Wui Sung Soo Dispositif de pulvérisation de volume ultra-réduit
TWI551803B (zh) * 2010-06-15 2016-10-01 拜歐菲樂Ｉｐ有限責任公司 低溫熱力閥裝置、含有該低溫熱力閥裝置之系統及使用該低溫熱力閥裝置之方法
DE102010039473B4 (de) * 2010-08-18 2014-11-20 Gema Switzerland Gmbh Pulverversorgungsvorrichtung für eine Pulverbeschichtungsanlage
DE102012013523A1 (de) * 2012-07-06 2014-01-09 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Steuerventil mit einer Einrichtung zur Erzeugung definierter Brems- und Lösezeiten
DE102013211550A1 (de) * 2013-06-19 2014-12-24 Gema Switzerland Gmbh Pulverfördervorrichtung insbesondere für Beschichtungspulver
MX2016003270A (es) 2013-09-13 2016-10-26 Biofilm Ip Llc Valvulas magneto-criogenicas, sistemas y metodos para modular flujo en un conducto.
DE102016106052A1 (de) * 2015-11-10 2017-05-11 Sms Group Gmbh Venturi-Düse, Pulvereinblasvorrichtung sowie Verfahren zum Betrieb einer Pulvereinblasvorrichtung
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US7607451B2 (en) 2004-09-02 2009-10-27 Weitmann & Konrad Gmbh & Co. Kg Device and method for the production of a powder-air mixture

Also Published As

Publication number Publication date
WO2000010726A1 (fr) 2000-03-02
DE19838276A1 (de) 2000-02-24
CA2341221A1 (fr) 2000-03-02
ATE253411T1 (de) 2003-11-15
EP1104334B1 (fr) 2003-11-05
DE59907645D1 (de) 2003-12-11
JP2002523216A (ja) 2002-07-30
ES2211105T3 (es) 2004-07-01
JP3426215B2 (ja) 2003-07-14
US6598803B1 (en) 2003-07-29

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