EP0899022A1 - Verfahren zur Steuerung der Absauganlage einer elektrostatischen Pulverbeschichtungsanlage und elektrostatische Pulverbeschichtungsanlage - Google Patents
Verfahren zur Steuerung der Absauganlage einer elektrostatischen Pulverbeschichtungsanlage und elektrostatische Pulverbeschichtungsanlage Download PDFInfo
- Publication number
- EP0899022A1 EP0899022A1 EP98113601A EP98113601A EP0899022A1 EP 0899022 A1 EP0899022 A1 EP 0899022A1 EP 98113601 A EP98113601 A EP 98113601A EP 98113601 A EP98113601 A EP 98113601A EP 0899022 A1 EP0899022 A1 EP 0899022A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- powder
- mass flow
- workpiece
- suction
- 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
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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
- 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
Definitions
- the invention relates to a method for operating a electrostatic powder coating system according to the generic term of claim 1 and an electrostatic powder coating system, who can work according to this procedure.
- Coating booth with vertical slots in the side wall are provided. Coating guns spray through these slots the coating medium on the workpiece.
- the workpieces to be coated can have different shapes and have sizes, e.g. B. narrow bridges, large closed areas, cavities, undercuts etc. Um the efficiency when applying the coating medium optimize, i.e. to as little coating powder as possible spraying past the workpiece, the cloud shape of a coating gun dispensed coating powder can be varied. Nevertheless, depending on the shape of the workpiece more or less coating powder not on the Impact the workpiece surface or do not stick there. The excess coating powder is a powder cloud in the coating booth, a part collects on Floor and walls of the cabin.
- the Coating cabins usually have an extraction system.
- the invention has for its object a method for Operate a powder coating system and a powder coating system specify where the extraction system with optimal efficiency works.
- the invention is based on the knowledge that in modern Powder coating systems admit the powder cloud to the Shape and size of the workpiece can be adjusted, however always a certain percentage of the coating powder will not get onto the workpiece surface or there does not stick. Starting from the whole, from everyone The amount of powder delivered to coating equipment can be the proportion of the excess powder based on experience can be estimated, and the performance of the suction system adapted to the amount of powder expected to be extracted. When it detects that powder dispensing has stopped or stopped the suction system can still be used during a continue to run for a certain delay and it switches afterwards automatically.
- the method according to the invention ensures that that the suction system always with the necessary suction power works to accumulate the excess Prevent coating powder in the coating booth; on the other hand, the energy requirements of the extraction system, which can be quite significant in large coating booths can be reduced to the minimum necessary because the Extraction system automatically switched off during the spray breaks is, and because it always only with the performance just necessary is working.
- the powder coating installation according to the invention preferably has a measuring device for the powder mass flow in the or each coating device and an actuating device for the suction system.
- the measuring device is preferably in the coating device integrated or arranged close to this.
- Facilities for measuring a powder mass flow which are suitable for the purposes of the present invention are in the DE-A-4 406 046 and DE-A-195 50 112 described on the Reference is made.
- FIG. 1 shows an electrostatic powder coating system, in which the method according to the invention are implemented can.
- This powder coating system is more detailed in the German patent application "control system of a coating system" the same applicant with the same filing date described. To the disclosure of this patent application and in particular the explanation of the network structure becomes a reference taken.
- Fig. 1 there are several (five) coating modules each a digital control device 60, an injector actuator 64 and a spray gun 66 shown are connected via a gun bus 62. These coating modules form self-regulating functional units, which their respective control signals from the digital control device 60 received. Information necessary for the regulation about the control unit receives the operating state of the coating system 60 via an internal bus 80.
- the multiple coating modules are via the internal bus 80 with each other, with a central control unit 82 and connected to other components of the system. Additional, modules that can be connected to the internal bus are e.g. a gap control module 86, a powder level control module 88, a position control module 90 and a motion control module 92.
- the central control unit 82 supplies the powder coating system with electrical power and compressed air. Further can the entire system in this control unit Emergency shutdown.
- the gap control module 86 is used to switch off the spray guns in the gaps between workpieces 200 or workpiece parts.
- the powder level control module 88 monitors the Level in a powder storage container.
- the position control module 90 controls the position of the spray guns in the z direction, i.e. the distance from spray gun 66 to workpiece 200.
- the motion control module 92 controls vertical stroke and Speed of up and down movement of the spray guns 66 depending on the height and speed of the coating Workpiece 200.
- a powder center is via an external bus 100 102 with a powder storage container 104, a layer thickness measuring and regulating device 107, 108 and a suction control 109 for an extraction system 114 for a powder recovery system 110, a parts recognition and identification device 111, a conveyor clock 112, a control device 106 for cabin cleaning and an associated one Cleaning device 116 connected.
- the suction control 109 contains a fan control, with which the speed of a suction fan in the Extraction system 114 and thus the performance of the extraction system can be adjusted.
- the suction control 109 receives over the buses 100, 80 from the digital control units 60 necessary information about the from the coating equipment 66 emitted powder mass flows to the suction line adjust accordingly or activate the extraction system and disable.
- the individual components configured as LON nodes are able to register themselves in the system, other system components recognize, adjust to them and with them communicate. You can see the information about each Operating conditions of the coating system they received via bus 80 or 100, evaluated automatically and use.
- FIG. 2 shows schematically an embodiment of a coating device 66 with integrated quantity sensor 50, integrated Speed sensor 52 and integrated high-voltage cascade 58.
- a set metered powder-air flow supplied with a nozzle 46 with a baffle 48 is issued.
- a high voltage generator which is shown schematically as a high-voltage cascade 58, a high voltage is generated and via a line 56 and an electrode (not shown) in the powder-air flow, to electrically charge the powder particles.
- a ground line 54 for grounding the Coating device 66 shown.
- the quantity sensor 50 and the speed sensor 52 serve to determine the powder density or powder speed in the conveyor line 10. They are below with reference to Figures 3 and 4 explained in more detail.
- FIGS. 3a and 3b show an embodiment of a microwave resonator 36 of the powder quantity sensor for determination the amount of powder per unit volume in the delivery line 10.
- the conveyor line is not electrically conductive, it will from the powder-air flow in the direction of the arrows in FIG. 3a flows through.
- the resonator 36 has shielding against interference fields a metal cylinder 38 to which an RF input 40 and a RF output 42 for coupling microwaves or for taking off the resonator voltage are provided.
- the resonator 44 is in the form of a Helix or coil, which is wound around the delivery line 10 is. This resonator takes up very little space, so that it can be integrated directly into the spray gun 66 can. With the helical resonator, a very precisely defined resonance and thus achieve a high quality.
- the helix resonator can e.g. as a thin film metal layer 44 are evaporated onto the delivery line 10, or a wire helix can be used.
- the resonance frequency of the resonator is measured and his goodness. These sizes are from the dielectric constant and the absorption (the loss factor) in the Resonance range dependent. The changes in the dielectric constant and the absorption are proportional to the change the amount of powder in the resonance range or resonance volume. It follows that a change in the amount of powder in Resonance volume to shift the resonance frequency and leads to a change in goodness. By measuring the Resonance frequency or the quality, can thus directly on the Powder quantity in the resonance volume can be inferred.
- the Method for determining the powder mass in the resonance volume is with further details in DE-A-44 06 046 and DE-A-196 50 112.
- Figure 4 shows schematically the structure of the speed measuring device.
- On the delivery line 10 are at a distance D two measuring electrodes 12, 14 attached, which over Signal lines 16, 18 and an amplifier 20 connected are.
- the outputs 22, 24 of the amplifier 20 are with a Measured value evaluation device 26 connected.
- the measuring electrodes consist of 12, 14 of copper rings around the delivery line 10 are laid around.
- the signal line 16, 18 and the amplifier 20 are grounded Shields 30, 32 and 34 respectively.
- the powder particles of the powder-air stream transported through the plastic line 10 become electrostatically charged due to the friction with the plastic tube material. These charges influence, or induce, voltages in the measuring electrodes 12, 14 which are passed to the measuring amplifier 20.
- the speed measurement method is in more detail described in DE-A-44 06 046.
- the amount sensor 50 and the Speed sensor 52 can thus the amount of powder and the powder speed can be determined to the total powder mass flow to determine who is at any time from is delivered to all coating equipment.
- the method according to the invention proceeds as follows.
- a Workpiece 200 passes through the coating booth 120 and the Coating guns 66 coating powder to the workpiece release, the powder mass flow of each coating device continuously captures and this information is via the respective control units 60 on the bus 80 other modules of the system.
- the information over the whole of all coating equipment dispensed powder mass flow is therefore at the entrance at any time the suction control 109 available so that this Set the suction power of the suction system 114 accordingly can.
- the suction control also use this information to Extraction system to the expected amount of excess Adjust powder.
- the suction control 109 switches the suction system 114 does not stop immediately, but leaves it still while an adjustable run-on time to continue working around the powder cloud, which is formed in the coating booth 21 has to aspirate as completely as possible.
Landscapes
- Electrostatic Spraying Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Spray Control Apparatus (AREA)
Abstract
Description
- Figur 1
- eine elektrostatische Pulverbeschichtungsanlagemäß der Erfindung;
- Figur 2
- zeigt ein Beschichtungsgerät mit integriertem Mengensensor und Geschwindigkeitssensor für die Pulverbeschichtungsanlage der Figur 1;
- Figuren 3a und 3b
- zeigen eine Außenansicht bzw. eine schematische Teilschnittdarstellung eines Mikrowellenresonators des Mengensensors der Figur 2;
- Figur 4
- zeigt eine detailiertere Darstellung des Geschwindigkeitssensors der Figur 2;
Claims (11)
- Verfahren zum Betreiben einer elektrostatischen Pulverbeschichtungsanlage mit mindestens einem Beschichtungsgerät (66), einer Be-schichtungskabine (120) und einer Absauganlage (109, 114) in der Beschichtungskabine, bei dem
ein Werkstück (200) durch die Beschichtungskabine geführt wird, Beschichtungspulver von dem Beschichtungsgerät (66) an das Werkstück abgegeben wird und überschüssiges Beschichtungspulver aus der Beschichtungskabine (120) abgesaugt wird, dadurch gekennzeichnet, daß der Pulvermassenstrom des von dem oder jedem Beschichtungsgerät (66) abgegebenen Beschichtungspulvers ermittelt wird und abhängig von dem Pulvermassenstrom die Absauganlage (109, 114) gesteuert wird. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Geschwindigkeit und die Dichte des abgegebenen Beschichtungspulvers in dem oder jedem Beschichtungsgerät (66) gemessen und daraus der Gesamt-Pulvermassenstrom berechnet wird.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Leistung der Absauganlage (109, 114) an die Größe des Gesamt-Pulvermassenstrom des oder der Beschichtungsgeräte(s) (66) angepaßt wird.
- Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Absauganlage (109, 114) aktiviert wird, wenn erkannt wird, daß das oder die Beschichtungsgerät(e) (66) Beschichtungspulver abgeben, und deaktiviert wird, wenn kein Beschichtungspulver abgegeben wird.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Absauganlage (109, 114) nach eine Verzögerungszeit deaktiviert wird.
- Elektrostatische Pulverbeschichtungsanlage mit mindestens einem Beschichtungsgerät (66) zum Abgeben eines elektrostatisch geladenen Beschichtungspulvers an ein Werkstück (200), einer Beschichtungskabine (120), durch die das Werkstück geführt wird, und einer Absauganlage (109, 114) zum Absaugen von überschüssigem Beschichtungspulver aus der Beschichtungskabine, gekennzeichnet durch eine Meßeinrichtung (50, 52) zum Ermitteln des Pulvermassenstrom des von dem oder jedem Beschichtungsgerät abgegebenen Beschichtungspulvers und eine Stelleinrichtung (109) zum Einstellen der Absauganlage abhängig von dem Pulvermassenstrom.
- Pulverbeschichtungsanlage nach Anspruch 6, dadurch gekennzeichnet, daß die Meßeinrichtung eine Geschwindigkeitsmeßvorrichtung (52) und eine Massenmeßvorrichtung (50) in dem oder jedem Beschichtungsgerät aufweist.
- Pulverbeschichtungsanlage nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, daß die Stelleinrichtung die Leistung der Absauganlage (109, 114) als Funktion des Gesamt-Pulvermassenstroms des oder der Beschichtungsgeräte(s) (66) einstellt.
- Pulverbeschichtungsanlage nach Anspruch 11, dadurch gekennzeichnet, daß mehrere Beschichtungsgeräte (66) vorhanden sind, die jeweils über einen Pistolenbus (62) mit ihrem zugeordneten digitalen Steuergerät (60) verbunden sind und einen Netzwerk-Knoten bilden, und daß die digitalen Steuergeräte (60) über einen Beschichtungsbus (80) mit weiteren Komponenten der Beschichtungsanlage verbunden sind.
- Pulverbeschichtungsanlage nach Anspruch 12, dadurch gekennzeichnet, daß die Stelleinrichtung als ein Netzwerk-Knoten ausgebildet ist.
- Pulverbeschichtungsanlage nach Anspruch 12 oder 13, dadurch gekennzeichnet, daß die Netzwerk-Knoten LON-Knoten sind.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19738097A DE19738097C2 (de) | 1997-09-01 | 1997-09-01 | Verfahren zum Betreiben einer elektrostatischen Pulverbeschichtungsanlage und elektrostatische Pulverbeschichtungsanlage |
DE19738097 | 1997-09-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0899022A1 true EP0899022A1 (de) | 1999-03-03 |
EP0899022B1 EP0899022B1 (de) | 2003-09-24 |
Family
ID=7840815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98113601A Expired - Lifetime EP0899022B1 (de) | 1997-09-01 | 1998-07-21 | Verfahren zur Steuerung der Absauganlage einer elektrostatischen Pulverbeschichtungsanlage und elektrostatische Pulverbeschichtungsanlage |
Country Status (4)
Country | Link |
---|---|
US (1) | US6071348A (de) |
EP (1) | EP0899022B1 (de) |
JP (1) | JPH11128783A (de) |
DE (2) | DE19738097C2 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1893345A1 (de) * | 2005-06-15 | 2008-03-05 | Noveo Technologies Inc. | Variable abluftsteuerung für spritzkabinen |
EP2368642A1 (de) * | 2010-01-19 | 2011-09-28 | Thomas Dipl.-Ing. Pilz | Belüftungsvorrichtung für Spritzlackieranlagen |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6589342B2 (en) | 2001-04-02 | 2003-07-08 | Abb Automation Inc. | Powder paint color changer |
US7005159B2 (en) * | 2001-04-02 | 2006-02-28 | Abb Inc. | Method of operating powder paint applicator |
DE10213275C1 (de) * | 2002-03-25 | 2003-12-24 | Wagner Ag Altstaetten J | Injektor für eine Pulverbeschichtungsanlage |
JP4106948B2 (ja) * | 2002-03-29 | 2008-06-25 | 東京エレクトロン株式会社 | 被処理体の跳上り検出装置、被処理体の跳上り検出方法、プラズマ処理装置及びプラズマ処理方法 |
US6755339B2 (en) | 2002-06-21 | 2004-06-29 | Delphi Technologies, Inc. | Fluxing apparatus for applying powdered flux |
DE10309143B4 (de) | 2003-02-28 | 2007-10-11 | Eisenmann Lacktechnik Gmbh & Co. Kg | Sensoreinrichtung an einer unter hoher Spannung stehenden Förderleitung |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3870375A (en) * | 1971-11-02 | 1975-03-11 | Nordson Corp | Powder spray system |
US4002143A (en) * | 1975-09-08 | 1977-01-11 | Indian Head Inc. | Hot end glass container coating system |
DE3722537A1 (de) * | 1987-07-08 | 1989-01-19 | Brennenstuhl Kg Hugo | Absaugvorrichtung fuer farbspritzraeume |
US4987001A (en) * | 1989-02-09 | 1991-01-22 | Nordson Corporation | Method and apparatus for coating the interior surface of hollow, tubular articles |
US5505763A (en) * | 1994-10-07 | 1996-04-09 | Nordson Corporation | System and method for controlling air flow through a powder coating booth |
WO1997002895A2 (en) * | 1995-07-13 | 1997-01-30 | Nordson Corporation | Powder coating system incorporating improved method and apparatus for monitoring flow rate of entrained particulate flow |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3014114C2 (de) * | 1980-04-12 | 1982-04-29 | Gema AG Apparatebau, 9015 St. Gallen | Einrichtung zum automatischen Beschichten von Gegenständen mit einer Spritzvorrichtung |
US4324812A (en) * | 1980-05-29 | 1982-04-13 | Ransburg Corporation | Method for controlling the flow of coating material |
JPS59109268A (ja) * | 1982-12-15 | 1984-06-23 | Asahi Okuma Ind Co Ltd | 静電塗装機 |
DE3822835A1 (de) * | 1988-07-06 | 1990-03-08 | Josef Schucker | Verfahren und anordnung zum lackieren von werkstueckoberflaechen |
US5244499A (en) * | 1992-06-19 | 1993-09-14 | Russell Mazakas | Powdered paint recovery tent for vertical extrusions |
DE4232026C2 (de) * | 1992-09-24 | 1996-10-24 | Wagner Int | Elektrostatische Beschichtungspistole und Verfahren zum Erzeugen einer Hochspannung |
DE4406046C2 (de) * | 1994-02-24 | 1997-11-20 | Wagner Int | Einrichtung und Verfahren zum Messen eines Pulver-Massestromes |
DE19502390C2 (de) * | 1995-01-26 | 1997-09-25 | S & S Metallsuchgeraete & Recy | Verfahren und Vorrichtung zum Auftragen von Schmierstoffen auf Bandmaterial |
DE19650112C1 (de) * | 1996-12-03 | 1998-05-20 | Wagner Int | Einrichtung und Verfahren zum Messen eines Pulver-Massestromes |
-
1997
- 1997-09-01 DE DE19738097A patent/DE19738097C2/de not_active Expired - Fee Related
-
1998
- 1998-07-21 EP EP98113601A patent/EP0899022B1/de not_active Expired - Lifetime
- 1998-07-21 DE DE59809700T patent/DE59809700D1/de not_active Expired - Fee Related
- 1998-08-31 JP JP10244956A patent/JPH11128783A/ja active Pending
- 1998-09-01 US US09/144,858 patent/US6071348A/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3870375A (en) * | 1971-11-02 | 1975-03-11 | Nordson Corp | Powder spray system |
US4002143A (en) * | 1975-09-08 | 1977-01-11 | Indian Head Inc. | Hot end glass container coating system |
DE3722537A1 (de) * | 1987-07-08 | 1989-01-19 | Brennenstuhl Kg Hugo | Absaugvorrichtung fuer farbspritzraeume |
US4987001A (en) * | 1989-02-09 | 1991-01-22 | Nordson Corporation | Method and apparatus for coating the interior surface of hollow, tubular articles |
US5505763A (en) * | 1994-10-07 | 1996-04-09 | Nordson Corporation | System and method for controlling air flow through a powder coating booth |
WO1997002895A2 (en) * | 1995-07-13 | 1997-01-30 | Nordson Corporation | Powder coating system incorporating improved method and apparatus for monitoring flow rate of entrained particulate flow |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1893345A1 (de) * | 2005-06-15 | 2008-03-05 | Noveo Technologies Inc. | Variable abluftsteuerung für spritzkabinen |
EP1893345A4 (de) * | 2005-06-15 | 2009-12-09 | Noveo Technologies Inc | Variable abluftsteuerung für spritzkabinen |
EP2368642A1 (de) * | 2010-01-19 | 2011-09-28 | Thomas Dipl.-Ing. Pilz | Belüftungsvorrichtung für Spritzlackieranlagen |
Also Published As
Publication number | Publication date |
---|---|
DE59809700D1 (de) | 2003-10-30 |
US6071348A (en) | 2000-06-06 |
EP0899022B1 (de) | 2003-09-24 |
JPH11128783A (ja) | 1999-05-18 |
DE19738097A1 (de) | 1999-03-04 |
DE19738097C2 (de) | 2000-01-27 |
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