EP2083235B1 - Device for drying objects, in particular painted vehicle bodies - Google Patents

Device for drying objects, in particular painted vehicle bodies Download PDF

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Publication number
EP2083235B1
EP2083235B1 EP20090000256 EP09000256A EP2083235B1 EP 2083235 B1 EP2083235 B1 EP 2083235B1 EP 20090000256 EP20090000256 EP 20090000256 EP 09000256 A EP09000256 A EP 09000256A EP 2083235 B1 EP2083235 B1 EP 2083235B1
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EP
European Patent Office
Prior art keywords
gas exchange
exchange chamber
gas
piston
inert gas
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Expired - Fee Related
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EP20090000256
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German (de)
French (fr)
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EP2083235A1 (en
Inventor
Werner Swoboda
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Eisenmann SE
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Eisenmann SE
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
    • F26B15/14—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by trays or racks or receptacles, which may be connected to endless chains or belts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/008—Seals, locks, e.g. gas barriers or air curtains, for drying enclosures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
    • F26B2210/12—Vehicle bodies, e.g. after being painted

Definitions

  • the invention relates to a device for drying objects, in particular painted vehicle bodies, according to the preamble of patent claim 1.
  • drying is meant here all processes by which a coating material is transferred from the state after application to the final state, be it by removal of solvents, melting, crosslinking or the like.
  • the inlet lock area substantially comprises three chambers: a first, which is filled with normal atmosphere and the freshly coated objects are supplied from the coating station.
  • a second chamber is partially below the first chamber, is connected thereto via a large-area opening through which the coated articles can be lowered, and contains an inert gas atmosphere whose density is greater than that of the outer normal atmosphere.
  • a third lock chamber is in turn above the second lock chamber approximately at the level of the first lock chamber and adjacent to this and is also connected to the second lock chamber via a large-area opening. It also contains an inert gas atmosphere and communicates with the inert gas atmosphere within the drying tunnel. The coated objects are guided through these lock chambers in the order listed.
  • a similar, but from the now dried objects in the reverse direction traversed outlet lock area is located at the end of the drying tunnel.
  • Inert gases in particular nitrogen, CO 2 , noble gases or other gases may be his, in which the content of the drying adversely affecting noxious gas component is below a predetermined limit.
  • nitrogen is a noxious gas component, and their concentration should be below 1 percent by volume.
  • a device of the type mentioned is from the US 2002/0006464 A1 known.
  • the items to be dried there are primarily food or drugs.
  • the vacuum pump provided there is used for vacuum drying, whereby pressures of 20 to 100 mbar are achieved.
  • a connection with the saving of inert gas does not exist.
  • WO 2008/098662 A1 describes a drying tunnel with locks, which is filled with inert gas.
  • the lock volume can be changed.
  • Object of the present invention is to develop a device of the type mentioned so that with the least possible expenditure on equipment, the inert gas consumption is further reduced.
  • a vacuum pump is used at the inlet of the drying tunnel.
  • the inlet lock area becomes a vacuum lock.
  • This has the advantage that their gas exchange chamber can be virtually completely freed from the atmosphere therein, even when there is an object.
  • the disadvantage here is that the walls of the gas exchange chamber must be made relatively stable in order to withstand the pressure applied from the outside after evacuation can.
  • the outlet of the drying tunnel is not also a vacuum lock used but one in which by the movement of a corresponding Part the atmosphere from the gas exchange chamber can be mechanically displaced.
  • This is possible at the outlet of the drying chamber with good success, because there is the displacement of the atmosphere in a state in which the gas exchange chamber is empty. Since the gas exchange chamber is not evacuated, its walls can be kept mechanically simpler and therefore cheaper.
  • the combination of a vacuum lock at the inlet and a "displacement lock" at the outlet is a solution that deals extremely sparingly with inert gas and nonetheless is relatively inexpensive to invest.
  • the gas exchange chamber of the inlet lock region can also be connectable to a buffer container for temporarily stored inert gas.
  • the inert gas which must be removed from the gas exchange chamber of the inlet lock area in a certain phase of the Naturalschleusungsvorganges, not to be discarded, but can be used again.
  • the device for changing the volume of the gas exchange chamber of the outlet lock region comprises a piston which is retractable into the gas exchange chamber and retractable therefrom.
  • the space which lies on the side opposite the gas exchange chamber of the outlet lock area side of the piston should be filled with inert gas. This is because, given its size, the piston can hardly be perfectly sealed against the walls of the gas exchange chamber, so there is always some gas leaking through it. This gas should not be a normal atmosphere but inert gas.
  • a valve can be arranged in the piston, with which a connection between the gas exchange chamber of the outlet lock area and the space on the opposite side of the piston can be established during extension of the piston.
  • the gas exchange chamber of the outlet lock area can be filled with inert gas.
  • a particularly advantageous embodiment of the invention is characterized in that a flushing device is provided, with which the atmosphere located in the gas exchange chambers of the inlet lock area and the outlet lock area can be mixed.
  • the atmosphere that is within the gas exchange chamber of the inlet lock area may be enriched with inert gas prior to evacuation, which would otherwise be uselessly lost. Due to this enrichment, this gas exchange chamber does not need to be evacuated as far as would be required without such a flushing device in order to achieve a certain maximum oxygen content. As a result, significantly shorter Abpump ceremonies and thus cycle times of the entire system can be achieved.
  • noxious gas concentration for example oxygen concentration
  • the noxious gas sensor also makes it possible to store quantities of gas which no longer meet the stringent requirements for the operation of the apparatus, but which still contain significantly less noxious gas than the ambient atmosphere for rinsing purposes in a buffer tank, the contents of which can be used in initial cycles of initial inerting is.
  • FIG. 1 a section of a paint shop for vehicle bodies 10 is shown in vertical section, which carries the reference number 1 in total.
  • This section comprises an inlet lock area 3 for a trocar tunnel 4, the drying tunnel 4 itself, which is only partially shown, and an outlet lock area 5.
  • the vehicle bodies 10 are, in FIG. 1 in the direction of the arrow 6 coming from a paint booth, not shown, through the inlet lock area 3, the drying tunnel 4 and the outlet lock area 5 moves, which is performed cyclically, at least in the lock areas 3, 5.
  • conveyor systems 7, 8, 9 which are not explained in greater detail are used, which are known to the person skilled in the art.
  • paint booth In the paint booth are in a known manner application devices with which automatically or by hand on the vehicle bodies 10 paint can be applied.
  • the paint booth in turn are preceded by other pretreatment stations that correspond to the state of the art.
  • the drying tunnel 4 is also in the state of the Built technology and contains suitable heating and irradiation facilities, with which the applied paint can be brought to dry or curing.
  • This is designed as a vacuum lock and comprises a gas exchange chamber 16, which can be closed at its two opposite end faces in each case by a motor-driven lifting gate 24 and 25 respectively.
  • the top wall of the gas exchange chamber 16 of the vacuum lock 3 is pierced by a working line 17 which leads to the inlet of a high-performance vacuum pump 18.
  • a discharge line 19 connects the outlet of the vacuum pump 18 with a gas line 20. Both to the right and to the left of the discharge point 19 of the discharge line 19 in the gas line 20 is a motor-controlled valve 21 and 22 respectively.
  • the gas line 20 leads via a further motor-operated valve 23 to the outlet lock area 5; Details will be explained below.
  • a buffer tank 15 for cached inert gas is connected via a bifurcated line 26 to the gas line 20, wherein in a branch 26 a of this line a pump 27 and in the other branch 26 b, a motor-operated valve 28 is located.
  • the outlet lock area 5 is designed as a "piston lock".
  • the name “piston lock” is explained by its now described structure:
  • the piston lock 5 also comprises a gas exchange chamber 31, which can be closed on both sides by a motor-driven lifting gate 32 or 33.
  • An outlet line 34 leads through the bottom of the piston lock 5 via a motor-operated valve 35 if necessary. Via a chimney to the outside atmosphere.
  • the ceiling of the Gausingsch 31 of the piston lock 5 is not stationary. Rather, it is formed by the lower end face of an upwardly open piston 36 in which a Check valve 37 is located.
  • the cross-section of the piston 36 is adapted to that of the gas exchange chamber 31, which thus has the function of an upwardly open cylinder.
  • the piston 36, by means of two lifting units 38, 39 in FIG. 1 are only hinted to be moved vertically.
  • an oxygen sensor 50 may be connected, which provides an oxygen content in the sucked gas entsprichendes output signal.
  • the oxygen sensor 50 may, for. Example, be a sensor that responds to the infrared absorption bands of oxygen molecules. Alternatively, it may be a solid oxygen sensor.
  • the oxygen sensor 50 determines that the oxygen content in the aspirated gas mixture is greater than the predetermined limit value, it causes a controller 51 of the system to open the valve 30 so much that in the suction lines 17 currently being used for supplying inert gas again the limit value for oxygen is below.
  • the controller 51 opens the motor-operated valve 22 and starts the pump 27 so that the oxygen-depleted gas still usable for flushing is pressed into the buffer tank 15. In the initial inertization, the purge gas can then escape from there by opening the valves 14, 28 of the working line 17 are supplied.
  • buffer containers 15 which contain different amounts of residual oxygen containing purge gas and are filled via separate pumps 27. They will then later be differently opened by the controller 51 according to the current value of the oxygen concentration at the plant inerting, and connected differently to the working line 17 by the control circuit 50 according to the progress of the inerting process via separate valves 28.
  • the above-mentioned gas line 20 opens at its left end in the drawing in the above the end face of the piston 36 and the top of a stationary ceiling of the housing of the piston lock 5 limited space.
  • the two outermost lift gates 24 and 33 of Appendix 1 are closed, as are the valves 13, 21, 22 and 30. Open, however, are the valves 14, 23 and 28. At this time, of course in the Appendix 1 no vehicle body 10.
  • the inerting process for example, begin with the fact that the gate 32, which connects the drying tunnel 4 with the gas exchange chamber 31 of the piston lock 5, is closed. By descending the piston 5, the normal atmosphere 31 located in the guest exchange chamber 31 is pushed out via the open valve 35. Now, the valve 35 is closed and the gate 32 is opened. By raising the piston 5, the normal atmosphere is sucked out of the drying tunnel 4 into the gas exchange space 31.
  • valves 13, 14 and 22 are closed; the valve 21 is opened.
  • a first vehicle body 10 can now enter the gas exchange chamber 10 of the vacuum lock 3 when the lift gate 24 is open.
  • the lifting gate 24 is brought into its closed position and then the gas exchange chamber 16 is pumped off via the working line 17 with the aid of the vacuum pump 18, the discharge of which escapes via the open valve 21 into the outside atmosphere.
  • valve 21 is closed; the valves 14 and 30 are opened. This has the consequence that the gas exchange chamber 16 is flooded from the reservoir 29 with inert gas until it reaches normal pressure.
  • the lifting gate 25 can be opened and the vehicle body 10 can be retracted into the already inertized drying tunnel 4, whereupon the lifting gate 25 is closed again. Now the valves 14 and 30 are closed and the valve 22 is opened. It can now with the help of the pumps 18 and 27, the inert gas is pumped out of the gas exchange chamber 16 of the vacuum lock 3 and cached in the buffer tank 15.
  • valve 22 is closed and the valve 13 is opened, so that the gas exchange chamber 16 of the vacuum lock 3 can be filled with normal atmosphere.
  • a vehicle body 10 is retracted once again with the valve 13 closed via the open lifting gate 24 in the direction of the arrow 6 in the gas exchange chamber 16 of the vacuum lock 3. Then the gate 24 is closed.
  • the gas exchange space 16 is evacuated by means of the vacuum pump 18. Now the valve 21 is closed; the valves 14 and 28 are open. Unlike the first transfer, the gas exchange space 16 of the vacuum lock 3 is now not flooded with fresh inert gas from its reservoir 29 but from the buffer tank 15 with cached inert gas. At most, 30 so much high-purity inert gas is metered from the reservoir 29 by appropriate short-term opening of the valve, that the permissible residual oxygen content in the inert gas atmosphere, which is located in the gas exchange chamber 16 is not exceeded. Thereafter, the valves 14 and 28 are closed again.
  • the lift gate 25 can be opened and the vehicle body 10 can be retracted into the drying tunnel 4.
  • the valves 22 and 28 are opened and the gas exchange chamber 16 of the vacuum lock 3 evacuated by means of the vacuum pump 18 and the pump 27, wherein the pumped inert gas is temporarily stored in the buffer tank 15.
  • valves 22 and 28 are closed and the valve 13 is opened, so that the gas exchange chamber 16 can be filled via the gas line 11 with normal atmosphere.
  • the passing through the vacuum lock 3 in the drying tunnel 4 vehicle bodies 10 are there in a known manner with electromagnetic radiation, preferably UV radiation, and optionally. Applied to heat, so that the applied coating cures.
  • FIG. 1 the gas exchange chamber 31 of the piston lock 5 is still occupied by a vehicle body 10. This must first be moved out, for which purpose the lifting gate 33 is opened and closed again after moving out of the vehicle body 10. Now, the valve 35 is opened in the outlet 34 and the piston 36 by means of the lifting units 38 * 39 pressed down, whereby the normal atmosphere of the gas exchange chamber 31 of the piston lock 5 is removed. In the space above the end face of the piston 36 flows with open valves 23 and 30 from the reservoir 29 fresh inert gas.
  • the piston 36 After closing the valves 30, 23 and 35, the piston 36 is raised. In this case, the check valve 37 opens in the end wall of the piston 36 so that inert gas from the space above this end wall can flow into the gas exchange chamber 31 of the piston lock 5.
  • FIG. 2 is the same Annex 1 as in FIG. 1 shown. However, this Appendix 1 has now been supplemented by a purging device, which is provided overall with the reference numeral 40 and to which the following description is limited.
  • This purging device 40 comprises two gas lines 41, 42 which connect the gas exchange spaces 16 and 31 of the vacuum lock 3 and the piston lock 5 with each other.
  • upper gas line 41 is near the Vacuum lock 3, a first motor-operated valve 43 and in the vicinity of the piston lock 5, a second motor-operated valve 44.
  • lower gas line 42 are in the vicinity of the vacuum lock 3, a first motor-operated valve 45 and in the vicinity of the piston lock 5, a second motor-operated valve 46.
  • a pump 47 is also arranged in the line 42.
  • the mouth points of the two lines 41 and 42 in the gas exchange chambers 16, 31 of the vacuum lock 3 and the piston lock 5 are as far away from each other as possible.
  • the operation of the purging device 40 is as follows:
  • the gas exchange chamber 16 is evacuated with the aid of the vacuum pump 18 at this residual oxygen content, it is sufficient to produce only about tenth part of the normal air pressure in the gas exchange chamber 16. This means that the time to reach the final vacuum when using the purging device 40 of the FIG. 2 is reduced by about 30%, assuming that the same vacuum pump 18 is used in both cases.

Description

Die Erfindung betrifft eine Vorrichtung zum Trocknen von Gegenständen, insbesondere von lackierten Fahrzeugkarosserien, nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for drying objects, in particular painted vehicle bodies, according to the preamble of patent claim 1.

Unter "Trocknen" werden hier alle Vorgänge verstanden, durch welche ein Beschichtungsmaterial vom Zustand nach dem Auftragen in den Endzustand überführt wird, sei es durch Entfernung von Lösemitteln, Aufschmelzen, Vernetzen o. ä..By "drying" is meant here all processes by which a coating material is transferred from the state after application to the final state, be it by removal of solvents, melting, crosslinking or the like.

In jüngster Zeit gewinnen zunehmend Lacke Bedeutung, die in einer Inertgasatmosphäre z.B. unter UV-Licht ausgehärtet werden müssen, um unerwünschte Reaktionen mit Bestandteilen der normalen Atmosphäre, insbesondere mit Sauerstoff, zu verhindern. Diese neuartigen Lacke zeichnen sich durch eine sehr hohe Oberflächengüte und durch kurze Reaktionszeiten aus. Der letztgenannte Vorteil setzt sich bei Lackieranlagen, die im kontinuierlichen Durchlauf betrieben werden, unmittelbar in geringere Anlagenlängen um, was selbstverständlich zu erheblich niedrigeren Investitionskosten führt.In recent years, increasing importance has been given to paints which, in an inert gas atmosphere, e.g. must be cured under UV light to prevent unwanted reactions with components of the normal atmosphere, especially with oxygen. These novel coatings are characterized by a very high surface quality and short reaction times. The latter advantage is in paint shops, which are operated in a continuous cycle, directly into smaller plant lengths, which of course leads to significantly lower investment costs.

Während bei herkömmlichen Trocknern bzw. Trockenverfahren, die mit Normalluft als Atmosphäre arbeiten, die Menge der Luft, die in den Trockner eingebracht und auch aus diesem wieder herausgeführt wird, aus Kostengründen von geringerer Bedeutung ist, muss bei Inertgasatmosphären auf einen möglichst geringen Verbrauch geachtet werden.While in conventional dryers or dry processes that operate with normal air as the atmosphere, the amount of air that is introduced into the dryer and also out of this is of lesser importance for cost reasons, must be paid in inert gas atmospheres on the lowest possible consumption ,

Eine Vorrichtung ähnlich derjenigen der eingangs genannten Art ist in der DE 10 2004 025 525 B3 beschrieben. Der Einlass-Schleusenbereich umfasst hier im Wesentlichen drei Kammern: eine erste, die mit Normalatmosphäre gefüllt ist und der die frisch beschichteten Gegenstände von der Beschichtungsstation zugeführt werden. Eine zweite Kammer liegt teilweise unterhalb der ersten Kammer, ist mit dieser über eine großflächige Öffnung verbunden, durch welche die beschichteten Gegenstände abgesenkt werden können, und enthält eine Inertgasatmosphäre, deren Dichte größer als diejenige der äußeren Normalatmosphäre ist. Eine dritte Schleusenkammer liegt wiederum oberhalb der zweiten Schleusenkammer etwa auf der Höhe der ersten Schleusenkammer und neben dieser und ist mit der zweiten Schleusenkammer ebenfalls über eine großflächige Öffnung verbunden. Auch sie enthält eine Inertgasatmosphäre und kommuniziert mit der Inertgasatmosphäre innerhalb des Trockentunnels. Die beschichteten Gegenstände werden durch diese Schleusenkammern in der angegebenen Reihenfolge geführt. Ein ähnlicher, jedoch von den nunmehr getrockneten Gegenständen in umgekehrter Richtung durchlaufener Auslass-Schleusenbereich befindet sich am Ende des Trockentunnels.A device similar to that of the type mentioned is in the DE 10 2004 025 525 B3 described. Here, the inlet lock area substantially comprises three chambers: a first, which is filled with normal atmosphere and the freshly coated objects are supplied from the coating station. A second chamber is partially below the first chamber, is connected thereto via a large-area opening through which the coated articles can be lowered, and contains an inert gas atmosphere whose density is greater than that of the outer normal atmosphere. A third lock chamber is in turn above the second lock chamber approximately at the level of the first lock chamber and adjacent to this and is also connected to the second lock chamber via a large-area opening. It also contains an inert gas atmosphere and communicates with the inert gas atmosphere within the drying tunnel. The coated objects are guided through these lock chambers in the order listed. A similar, but from the now dried objects in the reverse direction traversed outlet lock area is located at the end of the drying tunnel.

Bei dieser Konstruktion können zwar die Inertgasverluste verhältnismäßig gering gehalten werden, gleichwohl besteht angesichts der Kosten des Inertgases immer ein Bedürfnis zur weiteren Reduzierung des Inertgasverbrauches.Although the inert gas losses can be kept relatively low in this construction, there is always a need to further reduce the inert gas consumption in view of the cost of the inert gas.

Inertgase können insbesondere Stickstoff, CO2, Edelgase oder andere Gase seine, bei denen der Gehalt an das Trocknen nachteilig beeinflussenden Schadgaskomponenten jeweils unter einem vorgegebenen Grenzwert liegt. Bei den heute verwendeten UV-härtenden Lacken ist z.B. Sauerstoff eine Schadgaskomponente, und deren Konzentration sollte unter 1 Volumenprozent liegen.Inert gases, in particular nitrogen, CO 2 , noble gases or other gases may be his, in which the content of the drying adversely affecting noxious gas component is below a predetermined limit. at For example, the UV-curing paints used today, oxygen is a noxious gas component, and their concentration should be below 1 percent by volume.

Eine Vorrichtung der eingangs genannten Art ist aus der US 2002/0006464 A1 bekannt geworden. Bei den dort zu trocknenden Gegenständen handelt es sich vornehmlich um Nahrungsmittel oder Arzneimittel. Die dort vorgesehene Vakuumpumpe dient der Vakuumtrocknung, wobei Drücke von 20 bis 100 mbar erreicht werden. Ein Zusammenhang mit der Einsparung von Inertgas besteht nicht.A device of the type mentioned is from the US 2002/0006464 A1 known. The items to be dried there are primarily food or drugs. The vacuum pump provided there is used for vacuum drying, whereby pressures of 20 to 100 mbar are achieved. A connection with the saving of inert gas does not exist.

WO 2008/098662 A1 beschreibt einen Trockentunnel mit Schleusen, der mit Inertgas gefüllt ist. WO 2008/098662 A1 describes a drying tunnel with locks, which is filled with inert gas.

Das Schleusenvolumen kann verändert werden.The lock volume can be changed.

Das Dokument fällt unter Artikel 54(3) EPÜ.The document falls under Article 54 (3) EPC.

Aufgabe der vorliegenden Erfindung ist es, eine Vorrichtung der eingangs genannten Art so weiterzubilden, dass bei möglichst geringem apparativem Aufwand der Inertgasverbrauch weiter reduziert ist.Object of the present invention is to develop a device of the type mentioned so that with the least possible expenditure on equipment, the inert gas consumption is further reduced.

Diese Aufgabe wird erfindungsgemäß mit den im Patentanspruch 1 angegebenen Mitteln gelöst.This object is achieved by the means specified in claim 1.

Wie im Stand der Technik bekannt, wird also am Einlass des Trockentunnels eine Vakuum-Pumpe verwendet. Bei der vorliegenden Erfindung wird dadurch der Einlass-Schleusenbereich zu einer Vakuum-Schleuse. Diese hat den Vorteil, dass ihre Gasaustauschkammer auch bei vorhandenem Gegenstand praktisch vollständig von der darin befindlichen Atmosphäre befreit werden kann. Nachteilig dabei ist allerdings, dass die Wände der Gasaustauschkammer verhältnismäßig stabil ausgebildet werden müssen, um nach der Evakuierung dem von außen anliegenden Druck standhalten zu können.As known in the art, therefore, a vacuum pump is used at the inlet of the drying tunnel. In the present invention thereby the inlet lock area becomes a vacuum lock. This has the advantage that their gas exchange chamber can be virtually completely freed from the atmosphere therein, even when there is an object. The disadvantage here, however, is that the walls of the gas exchange chamber must be made relatively stable in order to withstand the pressure applied from the outside after evacuation can.

Erfindungsgemäß wird daher am Auslass des Trockentunnels nicht ebenfalls eine Vakuum-Schleuse eingesetzt sondern eine solche, bei welcher durch die Bewegung eines entsprechenden Teiles die Atmosphäre aus der Gasaustauschkammer mechanisch verdrängt werden kann. Dies ist am Auslass der Trockenkammer deshalb bei gutem Erfolg möglich, weil dort die Verdrängung der Atmosphäre in einem Zustand geschieht, in dem die Gasaustauschkammer leer ist. Da die Gasaustauschkammer nicht evakuiert wird, können ihre Wände mechanisch einfacher und daher preiswerter gehalten werden. So stellt die Kombination einer Vakuum-Schleuse am Einlass und einer "Verdrängungs-Schleuse" am Auslass eine Lösung dar, die extrem sparsam mit Inertgas umgeht und gleichwohl im Investitionsaufwand verhältnismäßig günstig ist.According to the invention therefore at the outlet of the drying tunnel is not also a vacuum lock used but one in which by the movement of a corresponding Part the atmosphere from the gas exchange chamber can be mechanically displaced. This is possible at the outlet of the drying chamber with good success, because there is the displacement of the atmosphere in a state in which the gas exchange chamber is empty. Since the gas exchange chamber is not evacuated, its walls can be kept mechanically simpler and therefore cheaper. Thus, the combination of a vacuum lock at the inlet and a "displacement lock" at the outlet is a solution that deals extremely sparingly with inert gas and nonetheless is relatively inexpensive to invest.

Die Gasaustauschkammer des Einlass-Schleusenbereiches kann wahlweise auch mit einem Pufferbehälter für zwischengespeichertes Inertgas verbindbar sein. In diesem Falle braucht das Inertgas, welche in einer bestimmten Phase des Durchschleusungsvorganges aus der Gasaustauschkammer des Einlass-Schleusenbereiches entfernt werden muss, nicht verworfen zu werden, sondern kann wieder genutzt werden.Optionally, the gas exchange chamber of the inlet lock region can also be connectable to a buffer container for temporarily stored inert gas. In this case, the inert gas, which must be removed from the gas exchange chamber of the inlet lock area in a certain phase of the Durchschleusungsvorganges, not to be discarded, but can be used again.

Zweckmäßigerweise umfasst die Einrichtung zur Veränderung des Volumens der Gasaustauschkammer des Auslass-Schleusenbereiches einen Kolben, der in die Gasaustauschkammer einfahrbar und aus dieser wieder ausfahrbar ist.Expediently, the device for changing the volume of the gas exchange chamber of the outlet lock region comprises a piston which is retractable into the gas exchange chamber and retractable therefrom.

Dabei sollte der Raum, der auf der der Gasaustauschkammer des Auslass-Schleusenbereichs gegenüberliegenden Seite des Kolbens liegt, mit Inertgas gefüllt sein. Dies hat seinen Grund darin, dass der Kolben angesichts seiner Größe kaum wirklich perfekt gegen die Wände der Gasaustauschkammer abgedichtet werden kann, so dass hier stets etwas Gas durchleckt. Dieses Gas sollte keine Normalatmosphäre sondern Inertgas sein.In this case, the space which lies on the side opposite the gas exchange chamber of the outlet lock area side of the piston should be filled with inert gas. This is because, given its size, the piston can hardly be perfectly sealed against the walls of the gas exchange chamber, so there is always some gas leaking through it. This gas should not be a normal atmosphere but inert gas.

In dem Kolben kann in diesem Falle ein Ventil angeordnet sein, mit welchem beim Ausfahren des Kolbens eine Verbindung zwischen der Gasaustauschkammer des Auslass-Schleusenbereiches und dem Raum auf der gegenüberliegenden Seite des Kolbens hergestellt werden kann. Auf diese Weise lässt sich in der entsprechenden Phase des Schleusenvorganges die Gasaustauschkammer des Auslass-Schleusenbereiches einfach mit Inertgas befüllen.In this case, a valve can be arranged in the piston, with which a connection between the gas exchange chamber of the outlet lock area and the space on the opposite side of the piston can be established during extension of the piston. In this way, in the corresponding phase of the lock process, the gas exchange chamber of the outlet lock area can be filled with inert gas.

Schließlich zeichnet sich eine besonders günstige Ausbildung der Erfindung dadurch aus, dass eine Spüleinrichtung vorgesehen ist, mit welcher die in den Gasaustauschkammern des Einlass-Schleusenbereiches und des Auslass-Schleusenbereiches befindlichen Atmosphären gemischt werden können. So kann die Atmosphäre, die innerhalb der Gasaustauschkammer des Einlass-Schleusenbereiches liegt, bereits vor der Evakuierung mit Inertgas angereichert werden, das andernfalls nutzlos verlorengehen würde. Durch diese Anreicherung braucht diese Gasaustauschkammer zur Erzielung eines bestimmten Maximal-Sauerstoffgehaltes nicht so weit evakuiert zu werden, wie dies ohne eine derartige Spüleinrichtung erforderlich wäre. Hierdurch lassen sich erheblich kürzere Abpumpzeiten und damit Taktzeiten der Gesamtanlage erreichen.Finally, a particularly advantageous embodiment of the invention is characterized in that a flushing device is provided, with which the atmosphere located in the gas exchange chambers of the inlet lock area and the outlet lock area can be mixed. Thus, the atmosphere that is within the gas exchange chamber of the inlet lock area may be enriched with inert gas prior to evacuation, which would otherwise be uselessly lost. Due to this enrichment, this gas exchange chamber does not need to be evacuated as far as would be required without such a flushing device in order to achieve a certain maximum oxygen content. As a result, significantly shorter Abpumpzeiten and thus cycle times of the entire system can be achieved.

Sieht man im Leitungssystem der Vorrichtung einen Schadgassensor vor, so kann man Änderungen der Schadgaskonzentration (z.B. Sauerstoffkonzentration) verfolgen.If one views a noxious gas sensor in the line system of the device, then one can follow changes in the noxious gas concentration (for example oxygen concentration).

Man kann dann dem zugeführten Gas noch so viel reines Inertgas zufügen, dass insgesamt die maximal zulässige Schadgaskonzentration unterschritten ist.It is then possible to add so much pure inert gas to the supplied gas that overall the maximum permissible pollutant gas concentration has not been reached.

Der Schadgassensor ermöglicht es auch, Gasmengen, die zwar nicht mehr den strengen Anforderungen für den Betrieb der Vorrichtung genügen, die aber immer noch deutlich weniger Schadgas enthalten als die Umgebungsatmosphäre, für Spülzwecke in einem Pufferbehälter zu speichern, dessen Inhalt in ersten Zyklen einer Anfangsinertisierung verwendbar ist.The noxious gas sensor also makes it possible to store quantities of gas which no longer meet the stringent requirements for the operation of the apparatus, but which still contain significantly less noxious gas than the ambient atmosphere for rinsing purposes in a buffer tank, the contents of which can be used in initial cycles of initial inerting is.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnung näher erläutert; Es zeigen

Figur 1
einen Vertikalschnitt durch einen Ausschnitt eines ersten Ausführungsbeispieles einer Lak- kieranlage für Fahrzeugkarosserien mit sche- matisch dargestellten Peripherieeinrichtungen;
Figur 2
im Vertikalschnitt den Ausschnitt einer Lackier- anlage von Figur 1, jedoch ergänzt durch eine Spüleinrichtung.
Embodiments of the invention will be explained in more detail with reference to the drawing; Show it
FIG. 1
a vertical section through a section a first embodiment of a Lak kieranlage for vehicle bodies with schematically illustrated peripheral devices;
FIG. 2
in vertical section the detail of a paint shop from FIG. 1 , but supplemented by a flushing device.

Zunächst wird auf die Figur 1 Bezug genommen. In dieser ist im Vertikalschnitt ein Ausschnitt aus einer Lackieranlage für Fahrzeugkarosserien 10 dargestellt, die insgesamt das Bezugszeichen 1 trägt. Dieser Ausschnitt umfasst einen Einlass-Schleusenbereich 3 für einen Trokkentunnel 4, den Trockentunnel 4 selbst, der nur teilweise dargestellt ist, sowie einen Auslass-Schleusenbereich 5. Die Fahrzeugkarosserien 10 werden, in Figur 1 im Sinne des Pfeiles 6 von einer nicht dargestellten Lackierkabine kommend, durch den Einlass-Schleusenbereich 3, den Trockentunnel 4 und den Auslass-Schleusenbereich 5 bewegt, was zumindest in den Schleusenbereichen 3, 5 taktweise durchgeführt wird. Dabei finden im Einzelnen nicht näher erläuterte Fördersysteme 7, 8, 9 Verwendung, die dem Fachmanne bekannt sind.First, on the FIG. 1 Referenced. In this, a section of a paint shop for vehicle bodies 10 is shown in vertical section, which carries the reference number 1 in total. This section comprises an inlet lock area 3 for a trocar tunnel 4, the drying tunnel 4 itself, which is only partially shown, and an outlet lock area 5. The vehicle bodies 10 are, in FIG. 1 in the direction of the arrow 6 coming from a paint booth, not shown, through the inlet lock area 3, the drying tunnel 4 and the outlet lock area 5 moves, which is performed cyclically, at least in the lock areas 3, 5. In detail, conveyor systems 7, 8, 9 which are not explained in greater detail are used, which are known to the person skilled in the art.

In der Lackierkabine befinden sich in bekannter Weise Applikationseinrichtungen, mit welchen automatisch oder auch von Hand auf die Fahrzeugkarosserien 10 Lack aufgebracht werden kann. Der Lackierkabine ihrerseits sind weitere Vorbehandlungsstationen vorgeschaltet, die dem Stand der Technik entsprechen.In the paint booth are in a known manner application devices with which automatically or by hand on the vehicle bodies 10 paint can be applied. The paint booth in turn are preceded by other pretreatment stations that correspond to the state of the art.

Dem dargestellten Ausschnitt der Lackieranlage 1 nachgeschaltet ist eine herkömmliche Kühlzone.The illustrated section of the painting 1 downstream of a conventional cooling zone.

Der Trockentunnel 4 ist ebenfalls nach dem Stande der Technik gebaut und enthält geeignete Heiz- und Bestrahlungseinrichtungen, mit denen der aufgebrachte Lack zum Trocknen bzw. Aushärten gebracht werden kann.The drying tunnel 4 is also in the state of the Built technology and contains suitable heating and irradiation facilities, with which the applied paint can be brought to dry or curing.

Während sich in der dem Trockentunnel 4 vorgeschalteten Lackierkabine und in dem dem Trockentunnel 4 nachgeschalteten Kühler sauerstoffhaltige "Normalatmosphäre" befindet, liegt im Inneren des Trockentunnels 4 eine Inertgasatmosphäre vor, die beispielsweise Stickstoff und/oder CO2 enthält.While there is an oxygen-containing "normal atmosphere" in the paint booth preceded by the drying tunnel 4 and in the cooler connected downstream of the drying tunnel 4, there is an inert gas atmosphere in the interior of the drying tunnel 4 which contains, for example, nitrogen and / or CO 2 .

Im vorliegenden Zusammenhang sind im Wesentlichen nur der Einlass-Schleusenbereich 3 sowie der Auslass-Schleusenbereich 5 von Interesse, mit denen die beiden genannten Atmosphären während des Durchschleusens der Fahrzeugkarosserien 10 so getrennt gehalten werden, dass ein möglichst geringer Verlust an Inertgasen erfolgt.In the present context, essentially only the inlet lock area 3 and the outlet lock area 5 are of interest, with which the two named atmospheres are kept separated during the passage of the vehicle bodies 10 such that the least possible loss of inert gases takes place.

Zunächst sei dies für den Eingangs-Schleusenbereich 3 erläutert. Diese ist als Vakuum-Schleuse ausgestaltet und umfasst eine Gasaustauschkammer 16, die an ihren beiden gegenüberliegenden Stirnseiten jeweils durch ein motorisch angetriebenes Hubtor 24 bzw. 25 verschlossen werden kann. Die Deckwand der Gasaustauschkammer 16 der Vakuum-Schleuse 3 wird von einer Arbeitsleitung 17 durchstoßen, die zum Einlass einer Hochleistungs-Vakuumpumpe 18 führt. Eine Ausstoßleitung 19 verbindet den Auslass der Vakuumpumpe 18 mit einer Gasleitung 20. Sowohl rechts als auch links von der Mündungsstelle der Ausstoßleitung 19 in die Gasleitung 20 befindet sich ein motorgesteuertes Ventil 21 bzw. 22.First, this is explained for the entrance lock area 3. This is designed as a vacuum lock and comprises a gas exchange chamber 16, which can be closed at its two opposite end faces in each case by a motor-driven lifting gate 24 and 25 respectively. The top wall of the gas exchange chamber 16 of the vacuum lock 3 is pierced by a working line 17 which leads to the inlet of a high-performance vacuum pump 18. A discharge line 19 connects the outlet of the vacuum pump 18 with a gas line 20. Both to the right and to the left of the discharge point 19 of the discharge line 19 in the gas line 20 is a motor-controlled valve 21 and 22 respectively.

Von der Arbeitsleitung 17 zweigen vor der Vakuumpumpe 18 zwei Gasleitungen 11, 12 ab, in denen jeweils ein weiteres motorbetätigtes Ventil 13 bzw. 14 liegt. Während die in Figur 1 rechte Gasleitung 11 ggfs. über einen Kamin in die Außenatmosphäre führt, mündet die in Figur 1 linke Gasleitung 12 in die Gasleitung 20 und zwar auf derjenigen Seite des Ventiles 22, die von der Mündungsstelle der Ausstoßleitung 19 in die Gasleitung 20 abgewandt ist.From the working line 17 branch off two gas lines 11, 12 in front of the vacuum pump 18, in each of which a further motor-operated valve 13 or 14 is located. While the in FIG. 1 right gas line 11 leads, if necessary. Via a chimney in the outside atmosphere, opens in FIG. 1 left gas line 12 in the gas line 20 and that on the side of the valve 22, which faces away from the discharge point of the discharge line 19 into the gas line 20.

Die Gasleitung 20 führt über ein weiteres motorbetätigtes Ventil 23 zum Auslass-Schleusenbereich 5; Details hierzu werden weiter unten erläutert.The gas line 20 leads via a further motor-operated valve 23 to the outlet lock area 5; Details will be explained below.

Ein Pufferbehälter 15 für zwischengespeichertes Inertgas ist über eine sich gabelnde Leitung 26 mit der Gasleitung 20 verbunden, wobei in einem Zweig 26a dieser Leitung eine Pumpe 27 und in dem anderen Zweig 26b ein motorbetätigtes Ventil 28 liegt.A buffer tank 15 for cached inert gas is connected via a bifurcated line 26 to the gas line 20, wherein in a branch 26 a of this line a pump 27 and in the other branch 26 b, a motor-operated valve 28 is located.

Mit der Leitung 20 ist außerdem über ein motorbetätigtes Ventil 30 ein Vorratsbehälter 29 für frisches, reines Inertgas verbunden.With the line 20 is also connected via a motor-operated valve 30, a reservoir 29 for fresh, pure inert gas.

Der Auslass-Schleusenbereich 5 ist als "Kolben-Schleuse" ausgestaltet. Der Name "Kolben-Schleuse" erklärt sich aus ihrem nunmehr beschriebenen Aufbau:The outlet lock area 5 is designed as a "piston lock". The name "piston lock" is explained by its now described structure:

Die Kolben-Schleuse 5 umfasst ebenfalls eine Gasaustauschkammer 31, die beidseits durch ein motorgetriebenes Hubtor 32 bzw. 33 verschlossen werden kann. Eine Auslassleitung 34 führt durch den Boden der Kolben-Schleuse 5 über ein motorbetätigtes Ventil 35 ggfs. über einen Kamin zur Außenatmosphäre.The piston lock 5 also comprises a gas exchange chamber 31, which can be closed on both sides by a motor-driven lifting gate 32 or 33. An outlet line 34 leads through the bottom of the piston lock 5 via a motor-operated valve 35 if necessary. Via a chimney to the outside atmosphere.

Anders als bei der Vakuum-Schleuse 3 ist die Decke der Gausaustauschkammer 31 der Kolben-Schleuse 5 nicht stationär. Sie wird vielmehr von der unteren Stirnseite eines nach oben offenen Kolbens 36 gebildet, in der sich ein Rückschlagventil 37 befindet. Der Querschnitt des Kolbens 36 ist an denjenigen der Gasaustauschkammer 31 angepasst, die so die Funktion eines nach oben offenen Zylinders ausübt. Der Kolben 36 kann mit Hilfe zweier Hub-Einheiten 38, 39 die in Figur 1 nur angedeutet sind, vertikal bewegt werden.Unlike the vacuum lock 3, the ceiling of the Gausaustauschkammer 31 of the piston lock 5 is not stationary. Rather, it is formed by the lower end face of an upwardly open piston 36 in which a Check valve 37 is located. The cross-section of the piston 36 is adapted to that of the gas exchange chamber 31, which thus has the function of an upwardly open cylinder. The piston 36, by means of two lifting units 38, 39 in FIG. 1 are only hinted to be moved vertically.

An die Arbeitsleitung 17 ist ein Sauerstoffsensor 50 angeschlossen sein, der ein dem Sauerstoffanteil im angesaugten Gas entsprichendes Ausgangssignal bereitstellt. Der Sauerstoffsensor 50 kann z. B. ein Sensor sein, der auf die Infrarot-Absorptionsbanden von Sauerstoffmolekülen anspricht. Alternativ kann es sich um einen Feststoffsensor für Sauerstoff handeln.To the working line 17, an oxygen sensor 50 may be connected, which provides an oxygen content in the sucked gas entsprichendes output signal. The oxygen sensor 50 may, for. Example, be a sensor that responds to the infrared absorption bands of oxygen molecules. Alternatively, it may be a solid oxygen sensor.

Stellt der Sauerstoffsensor 50 fest, dass der Sauerstoffgehalt im angesaugten Gasgemisch größer ist als der vorgegebene Grenzwert, so veranlasst er eine Steuerung 51 der Anlage, das Ventil 30 so stark zu öffnen, dass in der gerade zur Zuführung von Inertgas verwendeten Absaugleitungen 17 wieder der Grenzwert für Sauerstoff unterschritten ist.If the oxygen sensor 50 determines that the oxygen content in the aspirated gas mixture is greater than the predetermined limit value, it causes a controller 51 of the system to open the valve 30 so much that in the suction lines 17 currently being used for supplying inert gas again the limit value for oxygen is below.

Saugt die Pumpe 18 Gas aus der Schleuse 3 ab, und liegt die Sauerstoffkonzentration unterhalb eines weiteren Grenzwertes, der über der schon angesprochenen Sauerstoff-Maximalkonzentration liegt, jedoch noch unterhalb eines weiteren Sauerstoffgrenzwertes, der für die Anfangsinertisierung noch sinnvoll ist, um den hohen Sauerstoffgehalt in mit Luft gefüllten Räumen der Anlage herabzusetzen, so öffnet die Steuerung 51 das motorbetätigte Ventil 22 und startet die Pumpe 27, so dass das zu Spülzwecken noch brauchbare sauerstoffabgereicherte Gas in den Pufferbehälter 15 gedrückt wird. In der Anfangsinertisierung kann das Spülgas von dort dann durch Öffnen der Ventile 14, 28 der Arbeitsleitung 17 zugeführt werden.Absorbs the pump 18 gas from the lock 3, and the oxygen concentration is below a further limit, which is above the already mentioned maximum oxygen concentration, but still below another oxygen limit, which is still useful for the initial inertization to the high oxygen content in To reduce air-filled spaces of the system, the controller 51 opens the motor-operated valve 22 and starts the pump 27 so that the oxygen-depleted gas still usable for flushing is pressed into the buffer tank 15. In the initial inertization, the purge gas can then escape from there by opening the valves 14, 28 of the working line 17 are supplied.

Es versteht sich, dass man auch mehrere Pufferbehälter 15 verwenden kann, die unterschiedlich starken Restsauerstoffgehalt aufweisendes Spülgas enthalten und über getrennte Pumpen 27 gefüllt werden. Sie werden dann später von der Steuerung 51 gemäß dem aktuellen Wert der Sauerstoffkonzentration bei der Inertisierung der Anlage unterschiedlich geöffnet werden, und durch die Steuerschaltung 50 gemäß dem Fortschritt des Inertisierungsvorganges über getrennte Ventile 28 unterschiedlich mit der Arbeitsleitung 17 verbunden.It is understood that it is also possible to use a plurality of buffer containers 15 which contain different amounts of residual oxygen containing purge gas and are filled via separate pumps 27. They will then later be differently opened by the controller 51 according to the current value of the oxygen concentration at the plant inerting, and connected differently to the working line 17 by the control circuit 50 according to the progress of the inerting process via separate valves 28.

Die oben bereits angesprochene Gasleitung 20 mündet an ihrem in der Zeichnung linken Ende in den oberhalb der Stirnseite des Kolbens 36 und oben von einer stationären Decke des Gehäuses der Kolben-Schleuse 5 begrenzten Raum.The above-mentioned gas line 20 opens at its left end in the drawing in the above the end face of the piston 36 and the top of a stationary ceiling of the housing of the piston lock 5 limited space.

Bevor die Anlage 1 in Betrieb genommen weden kann, muss eine sog. "Anfangsinertisierung" des Trockentunnels 4 stattfinden. Hierunter ist zu verstehen, dass die Normalatmosphäre, die sich zunächst im Trockentunnel 4 befindet, durch eine Inertgasatmosphäre ersetzt werden muss, die den Anforderungen des Lackherstellers genügt. Dies bedeutet, dass der Sauerstoffgehalt in der Atmosphäre, die im Trockentunnel 4 herrscht, unter einen vorgegebenen Grenzwert abgesenkt werden muss, der z.B. ein Volumenprozent betragen kann. Diese "Anfangsinertisierung" kann mit Hilfe der Kolben-Schleuse 5 in folgender Weise vorgenommen werden:Before the plant 1 can be put into operation, a so-called "initial inertisation" of the drying tunnel 4 must take place. This is to be understood that the normal atmosphere, which is initially located in the drying tunnel 4, must be replaced by an inert gas atmosphere that meets the requirements of the paint manufacturer. This means that the oxygen content in the atmosphere prevailing in the drying tunnel 4 must be lowered below a predetermined limit, e.g. may be one percent by volume. This "initial inerting" can be carried out with the aid of the piston lock 5 in the following manner:

Zunächst werden die beiden äußersten Hubtore 24 und 33 der Anlage 1 geschlossen, ebenso die Ventile 13, 21, 22 und 30. Geöffnet dagegen werden die Ventile 14, 23 und 28. Zu diesem Zeitpunkt befindet sich selbstverständlich in der Anlage 1 noch keine Fahrzeugkarosserie 10. Der Inertisierungsvorgang kann beispielsweise damit beginnen, dass das Tor 32, welches den Trockentunnel 4 mit der Gasaustauschkammer 31 der Kolben-Schleuse 5 verbindet, geschlossen wird. Durch Herabfahren des Kolbens 5 wird die in der Gastauschkammer 31 befindliche Normalatmosphäre 31 über das geöffnete Ventil 35 herausgedrückt. Nunmehr wird das Ventil 35 geschlossen und das Tor 32 geöffnet. Durch Anheben des Kolbens 5 wird die Normalatmosphäre aus dem Trockentunnel 4 heraus in den Gasaustauschraum 31 eingesaugt. Aus dem Vorratsbehälter 29 fließt über das geöffnete Ventil 30, die Gasleitungen 20 und 12 sowie das geöffnete Ventil 14 und die Arbeitsleitung 17 Inertgas in die Gasaustauschkammer 16 der Vakuum-Schleuse 3 ein. Das Inertgas fließt sodann über das geöffnete Hubtor 25 in den Trockentunnel 4 ein. Dieser "Pumpvorgang", der durch die Kolben-Schleuse 5 bewirkt wird, kann mehrfach zyklich wiederholt werden, bis die Atmopshäre im Trokkentunnel 4 den Anforderungen an eine Inertgasatmosphäre genügt.First, the two outermost lift gates 24 and 33 of Appendix 1 are closed, as are the valves 13, 21, 22 and 30. Open, however, are the valves 14, 23 and 28. At this time, of course in the Appendix 1 no vehicle body 10. The inerting process, for example, begin with the fact that the gate 32, which connects the drying tunnel 4 with the gas exchange chamber 31 of the piston lock 5, is closed. By descending the piston 5, the normal atmosphere 31 located in the guest exchange chamber 31 is pushed out via the open valve 35. Now, the valve 35 is closed and the gate 32 is opened. By raising the piston 5, the normal atmosphere is sucked out of the drying tunnel 4 into the gas exchange space 31. From the reservoir 29 flows via the open valve 30, the gas lines 20 and 12 and the open valve 14 and the working line 17 inert gas in the gas exchange chamber 16 of the vacuum lock 3 a. The inert gas then flows via the open lifting gate 25 into the drying tunnel 4. This "pumping action", which is caused by the piston lock 5, can be repeated several times cyclically until the atmosphere in the drying tunnel 4 meets the requirements for an inert gas atmosphere.

Sodann kann mit dem Trocknungsbetrieb der Anlage 1 begonnen werden. Dieser funktioniert wie folgt:Then can be started with the drying operation of the system 1. This works as follows:

Für den ersten Durchschleusungsvorgang werden die Ventile 13, 14 und 22 geschlossen; das Ventil 21 wird geöffnet. Eine erste Fahrzeugkarosserie 10 kann nunmehr bei geöffnetem Hubtor 24 in die Gasaustauschkammer 10 der Vakuum-Schleuse 3 einfahren. Das Hubtor 24 wird in seine Schließstellung gebracht und sodann die Gasaustauschkammer 16 über die Arbeitsleitung 17 mit Hilfe der Vakuumpumpe 18 abgepumpt, deren Ausstoß über das geöffente Ventil 21 in die Außenatmosphäre entweicht.For the first Durchschleusungsvorgang the valves 13, 14 and 22 are closed; the valve 21 is opened. A first vehicle body 10 can now enter the gas exchange chamber 10 of the vacuum lock 3 when the lift gate 24 is open. The lifting gate 24 is brought into its closed position and then the gas exchange chamber 16 is pumped off via the working line 17 with the aid of the vacuum pump 18, the discharge of which escapes via the open valve 21 into the outside atmosphere.

Sodann wird das Ventil 21 geschlossen; die Ventile 14 und 30 werden geöffnet. Dies hat zur Folge, dass die Gasaustauschkammer 16 aus dem Vorratsbehälter 29 mit Inertgas bis zum Erreichen des Normaldruckes geflutet wird.Then the valve 21 is closed; the valves 14 and 30 are opened. This has the consequence that the gas exchange chamber 16 is flooded from the reservoir 29 with inert gas until it reaches normal pressure.

Nunmehr kann das Hubtor 25 geöffnet und die Fahrzeugkarosserie 10 in den bereits inertisierten Trocknertunnel 4 eingefahren werden, worauf das Hubtor 25 wieder geschlossen wird. Jetzt werden die Ventile 14 und 30 geschlossen und das Ventil 22 geöffnet. Es kann nun mit Hilfe der Pumpen 18 und 27 das Inertgas aus dem Gasaustauschraum 16 der Vakuum-Schleuse 3 abgepumpt und in dem Pufferbehälter 15 zwischengespeichert werden.Now, the lifting gate 25 can be opened and the vehicle body 10 can be retracted into the already inertized drying tunnel 4, whereupon the lifting gate 25 is closed again. Now the valves 14 and 30 are closed and the valve 22 is opened. It can now with the help of the pumps 18 and 27, the inert gas is pumped out of the gas exchange chamber 16 of the vacuum lock 3 and cached in the buffer tank 15.

Nunmehr wird das Ventil 22 geschlossen und das Ventil 13 geöffnet, so dass sich die Gasaustauschkammer 16 der Vakuum-Schleuse 3 mit Normalatmosphäre füllen kann.Now, the valve 22 is closed and the valve 13 is opened, so that the gas exchange chamber 16 of the vacuum lock 3 can be filled with normal atmosphere.

Die oben geschilderten Abläufe finden in dieser Weise, wie schon erwähnt, nur beim ersten Schleusungsvorgang nach Inbetriebnahme der Anlage 1 statt. Die weiteren Schleusungsvorgänge sind dem gegenüber wie folgt modifiziert:The above-mentioned processes found in this way, as already mentioned, only in the first Schleusungsvorgang after commissioning of the system 1 instead. The other smuggling operations are modified as follows:

Zunächst wird erneut bei geschlossenem Ventil 13 eine Fahrzeugkarosserie 10 über das geöffnete Hubtor 24 im Sinne des Pfeiles 6 in die Gasaustauschkammer 16 der Vakuum-Schleuse 3 eingefahren. Sodann wird das Tor 24 geschlossen.First, a vehicle body 10 is retracted once again with the valve 13 closed via the open lifting gate 24 in the direction of the arrow 6 in the gas exchange chamber 16 of the vacuum lock 3. Then the gate 24 is closed.

Bei geöffneten Ventil 21 wird, wie oben für die erste Durchschleusung geschildert, der Gasaustauschraum 16 mit Hilfe der Vakuumpumpe 18 evakuiert. Nunmehr wird das Ventil 21 geschlossen; die Ventile 14 und 28 werden geöffnet. Anders als bei der ersten Durchschleusung wird jetzt der Gasaustauschraum 16 der Vakuum-Schleuse 3 nicht mit frischem Inertgas aus dessen Vorratsbehälter 29 sondern aus dem Pufferbehälter 15 mit zwischengespeichertem Inertgas geflutet. Allenfalls wird aus dem Vorratsbehälter 29 durch entsprechendes kurzzeitiges Öffnen des Ventiles 30 so viel hochreines Inertgas zudosiert, dass der zulässige Restsauerstoffgehalt in der Inertgasatmosphäre, die sich in der Gasaustauschkammer 16 befindet, nicht überschritten wird. Danach werden die Ventile 14 und 28 wieder geschlossen.When the valve 21 is open, as described above for the first passage, the gas exchange space 16 is evacuated by means of the vacuum pump 18. Now the valve 21 is closed; the valves 14 and 28 are open. Unlike the first transfer, the gas exchange space 16 of the vacuum lock 3 is now not flooded with fresh inert gas from its reservoir 29 but from the buffer tank 15 with cached inert gas. At most, 30 so much high-purity inert gas is metered from the reservoir 29 by appropriate short-term opening of the valve, that the permissible residual oxygen content in the inert gas atmosphere, which is located in the gas exchange chamber 16 is not exceeded. Thereafter, the valves 14 and 28 are closed again.

Nunmehr kann das Hubtor 25 geöffnet und die Fahrzeugkarosserie 10 in den Trockentunnel 4 eingefahren werden. Nach dem Schließen des Hubtores 25 werden die Ventile 22 und 28 geöffnet und die Gasaustauschkammer 16 der Vakuum-Schleuse 3 mit Hilfe der Vakuumpumpe 18 und der Pumpe 27 evakuiert, wobei das abgepumpte Inertgas im Pufferbehälter 15 zwischengespeichert wird.Now, the lift gate 25 can be opened and the vehicle body 10 can be retracted into the drying tunnel 4. After closing the lifting gate 25, the valves 22 and 28 are opened and the gas exchange chamber 16 of the vacuum lock 3 evacuated by means of the vacuum pump 18 and the pump 27, wherein the pumped inert gas is temporarily stored in the buffer tank 15.

Schließlich werden die Ventile 22 und 28 geschlossen und das Ventil 13 geöffnet, so dass sich die Gasaustauschkammer 16 über die Gasleitung 11 mit Normalatmosphäre füllen kann.Finally, the valves 22 and 28 are closed and the valve 13 is opened, so that the gas exchange chamber 16 can be filled via the gas line 11 with normal atmosphere.

Diese Vorgänge wiederholen sich nunmehr mit jedem neuen Schleusungsvorgang.These processes are now repeated with each new smuggling process.

Man erkennt, welcher Vorteil mit der geschilderten Betriebsweise der Vakuum-Schleuse 3 verbunden ist. Der Inertgasverbrauch reduziert sich insofern, als nur für die Erstbefüllung der Gasaustauschkammer 16 der Vakuum-Schleuse 3 die Gasaustauschkammer 16 mit hochreinem, frischen Inertgas gefüllt zu werden braucht. Bei den weiteren Schleusungsgängen muss dann nur noch minimal frisches Inertgas zudosiert werden, um die Restsauerstoffmenge in der Gasaustauschkammer 16 niedrig genug zu halten.It can be seen which advantage is associated with the described mode of operation of the vacuum lock 3. The inert gas consumption is reduced insofar as only for the initial filling of the gas exchange chamber 16 of the vacuum lock 3, the gas exchange chamber 16 needs to be filled with high purity, fresh inert gas. In the other Schleusungsgängen must then only minimal fresh inert gas are metered to keep the residual oxygen amount in the gas exchange chamber 16 low enough.

Die durch die Vakuum-Schleuse 3 in den Trockentunnel 4 gelangten Fahrzeugkarosserien 10 werden dort in bekannter Weise mit elektromagnetischer Strahlung, vorzugsweise UV-Strahlung, und ggfs. mit Wärme beaufschlagt, so dass die auf diese aufgetragene Beschichtung aushärtet.The passing through the vacuum lock 3 in the drying tunnel 4 vehicle bodies 10 are there in a known manner with electromagnetic radiation, preferably UV radiation, and optionally. Applied to heat, so that the applied coating cures.

Ihre Ausschleusung aus dem Trockentunnel 4 mit Hilfe der Kolben-Schleuse 5 geschieht nun in folgender Weise:Your discharge from the drying tunnel 4 by means of the piston lock 5 is now done in the following manner:

In Figur 1 ist die Gasaustauschkammer 31 der Kolben-Schleuse 5 noch von einer Fahrzeugkarosserie 10 belegt. Diese muss zunächst herausgefahren werden, wozu das Hubtor 33 geöffnet und nach dem Herausfahren der Fahrzeugkarosserie 10 wieder geschlossen wird. Nunmehr wird das Ventil 35 in der Auslassleitung 34 geöffnet und der Kolben 36 mit Hilfe der Hubeinheiten 38* 39 nach unten gedrückt, wodurch die Normalatmosphäre aus der Gasaustauschkammer 31 der Kolben-Schleuse 5 entfernt wird. In den Raum oberhalb der Stirnseite des Kolbens 36 strömt bei geöffneten Ventilen 23 und 30 aus dem Vorratsbehälter 29 frisches Inertgas ein.In FIG. 1 the gas exchange chamber 31 of the piston lock 5 is still occupied by a vehicle body 10. This must first be moved out, for which purpose the lifting gate 33 is opened and closed again after moving out of the vehicle body 10. Now, the valve 35 is opened in the outlet 34 and the piston 36 by means of the lifting units 38 * 39 pressed down, whereby the normal atmosphere of the gas exchange chamber 31 of the piston lock 5 is removed. In the space above the end face of the piston 36 flows with open valves 23 and 30 from the reservoir 29 fresh inert gas.

Nach dem Schließen der Ventile 30, 23 und 35 wird der Kolben 36 angehoben. Dabei öffnet sich das Rückschlagventil 37 in der Stirnwand des Kolbens 36, so dass Inertgas aus dem Raum oberhalb dieser Stirnwand in die Gasaustauschkammer 31 der Kolben-Schleuse 5 einfließen kann.After closing the valves 30, 23 and 35, the piston 36 is raised. In this case, the check valve 37 opens in the end wall of the piston 36 so that inert gas from the space above this end wall can flow into the gas exchange chamber 31 of the piston lock 5.

Das Obige gilt erneut nur für den ersten Schleusungsvorgang, bei dem aus dem Vorratsbehälter 29 frisches Inertgas entnommen wird. Bei weiteren Schleusungsvorgängen kann zumindest zum Großteil bei der Befüllung des Raumes oberhalb der Stirnwand des Kolbens 36 auch auf im Pufferbehälter 15 zwischengespeichertes Inertgas zurückgegriffen werden, wobei dann in ähnlicher Weise, wie dies oben für die Vakuum-Schleuse 3 beschrieben wurde, zum Einhalten eines bestimmten Höchst-Sauerstoffgehaltes frisches Inertgas aus dem Vorratsbehälter 29 zudosiert werden kann.The above applies again only for the first smuggling process, in which from the reservoir 29 fresh inert gas is removed. In further Schleusungsvorgängen at least for the most part in the filling of the space above the end wall of the piston 36 and reclaimed in the buffer tank 15 inert gas, then in a similar manner as described above for the vacuum lock 3, to comply with a certain Maximum oxygen content fresh inert gas from the reservoir 29 can be added.

Erneut erschließen sich die Vorteile leicht, die mit der geschilderten Betriebsweise der Kolben-Schleuse 5 verbunden sind:Once again, the advantages that are associated with the described mode of operation of the piston lock 5 are readily apparent:

Es handelt sich um einen Zwei-Takt-Betrieb, bei dem mit Hilfe einer sehr einfachen Technik ein schneller Gasaustausch bewirkt werden kann. Verglichen mit der Vakuum-Schleuse 3 ist die Investition gering. Außerdem muss keine Spülung der Gasaustauschkammer 31 vorgenommen werden, wie dies bei bekannten Schleusen der Fall war. Es genügt für einen einzigen Schleusungsvorgang eine Menge an Inertgas, die dem maximalen Volumen der Gasaustauschkammer 31 der Kolben-Schleuse 5 entspricht.It is a two-stroke operation in which a quick gas exchange can be effected by means of a very simple technique. Compared with the vacuum lock 3, the investment is low. In addition, no flushing of the gas exchange chamber 31 must be made, as was the case with known locks. It suffices for a single Schleusungsvorgang a lot of inert gas, which corresponds to the maximum volume of the gas exchange chamber 31 of the piston lock 5.

In Figur 2 ist dieselbe Anlage 1 wie in Figur 1 dargestellt. Diese Anlage 1 wurde nunmehr jedoch durch eine Spüleinrichtung ergänzt, die insgesamt mit dem Bezugszeichen 40 versehen ist und auf die sich die nachfolgende Beschreibung beschränkt. Diese Spüleinrichtung 40 umfasst zwei Gasleitungen 41, 42, welche die Gasaustauschräume 16 bzw. 31 der Vakuum-Schleuse 3 und der Kolben-Schleuse 5 miteinander verbinden. In der in Figur 2 oberen Gasleitung 41 liegt in der Nähe der Vakuum-Schleuse 3 ein erstes motorbetriebenes Ventil 43 und in der Nähe der Kolben-Schleuse 5 ein zweites motorbetriebenes Ventil 44. In der in Figur 2 unteren Gasleitung 42 liegen in der Nähe der Vakuum-Schleuse 3 ein erstes motorbetätigtes Ventil 45 und in der Nähe der Kolben-Schleuse 5 ein zweites motorbetätigtes Ventil 46. Zwischen den Ventilen 45 und 46 ist in der Leitung 42 außerdem eine Pumpe 47 angeordnet. Die Mündungsstellen der beiden Leitungen 41 und 42 in die Gasaustauschkammern 16, 31 der Vakuum-Schleuse 3 und der Kolben-Schleuse 5 liegen so weit wie möglich voneinander entfernt.In FIG. 2 is the same Annex 1 as in FIG. 1 shown. However, this Appendix 1 has now been supplemented by a purging device, which is provided overall with the reference numeral 40 and to which the following description is limited. This purging device 40 comprises two gas lines 41, 42 which connect the gas exchange spaces 16 and 31 of the vacuum lock 3 and the piston lock 5 with each other. In the in FIG. 2 upper gas line 41 is near the Vacuum lock 3, a first motor-operated valve 43 and in the vicinity of the piston lock 5, a second motor-operated valve 44. In the in FIG. 2 lower gas line 42 are in the vicinity of the vacuum lock 3, a first motor-operated valve 45 and in the vicinity of the piston lock 5, a second motor-operated valve 46. Between the valves 45 and 46, a pump 47 is also arranged in the line 42. The mouth points of the two lines 41 and 42 in the gas exchange chambers 16, 31 of the vacuum lock 3 and the piston lock 5 are as far away from each other as possible.

Die Funktionsweise der Spüleinrichtung 40 ist wie folgt:The operation of the purging device 40 is as follows:

Es sei eine Ausgangssituation betrachtet, bei welcher der Trockentunnel 4 und die Gasaustauschkammer 31 der Kolben-Schleuse 5 mit Inertgas gefüllt sind und eine Fahrzeugkarosserie 10 in die Gasaustauschkammer 31 der Kolben-Schleuse 5 eingefahren ist; beide Hubtore 32 und 33 der Kolben-Schleuse 5 sind geschlossen. Zum gleichen Zeitpunkt ist in die Gasaustauschkammer 16 der Vakuum-Schleuse 3 ebenfalls eine Fahrzeugkarosserie 10 eingefahren; in dieser Gasaustauschkammer 16 befindet sich jedoch Normalatmosphäre. Auch die beiden Hubtore 24 und 25 der Vakuum-Schleuse 3 sind geschlossen. Nunmehr wird mit Hilfe der Pumpe 47 das Gasvolumen innerhalb der Gasaustauschkammer 31 mit dem Gasvolumen in der Gasaustauschkammer 16 der Vakuum-Schleuse 3 vermischt. Dies hat zur Folge, dass sich in beiden Gasaustauschkammern 16, 31 eine Atmosphäre mit einer Restsauerstoffmenge von etwa 10 % einstellt, wenn man in etwa gleiche Volumina beider Gasaustauschkammern 16, 31 unterstellt.Consider an initial situation in which the drying tunnel 4 and the gas exchange chamber 31 of the piston lock 5 are filled with inert gas and a vehicle body 10 is retracted into the gas exchange chamber 31 of the piston lock 5; both lifting gates 32 and 33 of the piston lock 5 are closed. At the same time a vehicle body 10 is also retracted into the gas exchange chamber 16 of the vacuum lock 3; However, in this gas exchange chamber 16 is normal atmosphere. The two lifting gates 24 and 25 of the vacuum lock 3 are closed. Now, with the aid of the pump 47, the gas volume within the gas exchange chamber 31 is mixed with the gas volume in the gas exchange chamber 16 of the vacuum lock 3. This has the consequence that in both gas exchange chambers 16, 31, an atmosphere with a residual oxygen amount of about 10% is established, assuming approximately equal volumes of both gas exchange chambers 16, 31.

Wird bei diesem Restsauerstoffgehalt die Gasaustauschkammer 16 mit Hilfe der Vakuumpumpe 18 evakuiert, so genügt es, in der Gasaustauschkammer 16 nur noch etwa den zehnten Teil des Normalluftdruckes herzustellen. Dies bedeutet, dass die Zeit bis zum Erreichen des Endvakuums bei Verwendung der Spüleinrichtung 40 der Figur 2 um ca. 30 % reduziert wird, wenn man unterstellt, dass dieselbe Vakuumpumpe 18 in beiden Fällen verwendet wird.If the gas exchange chamber 16 is evacuated with the aid of the vacuum pump 18 at this residual oxygen content, it is sufficient to produce only about tenth part of the normal air pressure in the gas exchange chamber 16. This means that the time to reach the final vacuum when using the purging device 40 of the FIG. 2 is reduced by about 30%, assuming that the same vacuum pump 18 is used in both cases.

Claims (7)

  1. A device for drying articles, in particular painted vehicle bodies (10), having
    a) a drying tunnel (4) whereof the interior is filled with an inert gas atmosphere;
    b) an inlet airlock region (3) which is arranged upstream of the drying tunnel (4), includes at least one gas exchange chamber (16) and separates the inert gas atmosphere prevailing within the drying tunnel (4) from the normal atmosphere outside;
    c) an outlet airlock region (5) which is arranged downstream of the drying tunnel (4), includes at least one gas exchange chamber (31) and separates the inert gas atmosphere prevailing within the drying tunnel (4) from the normal atmosphere outside;
    d) a conveying system (7, 8, 9) which guides the articles though the inlet airlock region (3), the drying tunnel (4) and the outlet airlock region (5);
    e) a storage reservoir (29) for inert gas which may be connected to the gas exchange chambers (16, 31) of the inlet airlock region (3) and the outlet airlock region (5);
    in which
    f) the gas exchange chamber (16) of the inlet airlock region (3) may be connected to a vacuum pump (18) whereof the outlet may be connected to the atmosphere outside;
    characterised in that
    g) the gas exchange chamber (31) of the outlet airlock region (5) includes a means (36, 38, 39) which is in a position to alter the volume of the gas exchange chamber (31) between a maximum value and a minimum value which is substantially equal to zero, for expelling the atmosphere in the gas exchange chamber (31).
  2. A device according to Claim 1, characterised in that the gas exchange chamber (16) of the inlet airlock region (3) may optionally also be connected to a buffer reservoir (15) for temporarily stored inert gas.
  3. A device according to Claim 1 or 2, characterised in that the means for altering the volume of the gas exchange chamber (31) of the outlet airlock region (5) includes a piston (36) which may be retracted into the gas exchange chamber (36) and extended therefrom again.
  4. A device according to Claim 3, characterised in that the space on the opposite side of the piston (36) to that of the gas exchange chamber (31) of the outlet airlock region (5) may be filled with inert gas.
  5. A device according to Claim 4, characterised in that a valve (37) is arranged in the piston (36) and may be used when the piston (36) is extended to make a connection between the gas exchange chamber (31) of the outlet airlock region (5) and the space on the opposite side of the piston (36).
  6. A device according to one of the preceding claims, characterised in that a flushing means (40) is provided and may be used to mix the atmospheres in the gas exchange chambers (16, 31) of the inlet airlock region (3) and the outlet airlock region (5).
  7. A device according to one of Claims 1 to 6, characterised in that a sensor (50) of harmful gases is arranged in a section of the lines through which gas flows, preferably a gas exchange line (17).
EP20090000256 2008-01-22 2009-01-10 Device for drying objects, in particular painted vehicle bodies Expired - Fee Related EP2083235B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810005584 DE102008005584B3 (en) 2008-01-22 2008-01-22 Device for drying objects, in particular painted vehicle bodies

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EP2083235A1 EP2083235A1 (en) 2009-07-29
EP2083235B1 true EP2083235B1 (en) 2011-07-13

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Cited By (3)

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CN103398558A (en) * 2013-07-24 2013-11-20 深圳市信宇人科技有限公司 Full-automatic combining module new energy material vacuum baking method and vacuum baking line
EP4036506A3 (en) * 2015-07-31 2022-10-12 Dürr Systems AG Treatment system and method for treating workpieces
US11740021B2 (en) 2015-07-31 2023-08-29 Dürr Systems Ag Treatment installation and method for treating workpieces

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DE102010002179A1 (en) 2010-02-22 2011-08-25 Dürr Systems GmbH, 74321 A lock for transferring a workpiece between an outer space and an inner space of a workpiece treatment area
CN106931726B (en) * 2017-03-23 2019-03-05 河北工业大学 A kind of baking drying process of lithium ion battery cell
CN108058286A (en) * 2018-01-10 2018-05-22 宁波得晴电器科技有限公司 Plastic pellet drying equipment
CN117490363A (en) * 2023-12-27 2024-02-02 四川易华智源科技有限公司 High-efficient baking equipment is used in electronic components processing

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FR2659133B1 (en) * 1990-03-05 1993-05-21 Blaizat Claude PROCESS FOR TOTAL OR PARTIAL DEHYDRATION OF PLANT PRODUCTS, ITS DEHYDRATION DEVICE AND THE PRODUCT OBTAINED.
DE19804386C2 (en) 1998-02-04 1999-12-30 Ttp Ingenieurbuero Method and device for drying or heat treating products, in particular with the aid of microwave radiation, and banana chips and banana powder produced therewith
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DE102004025526B4 (en) * 2004-05-25 2006-04-13 Eisenmann Maschinenbau Gmbh & Co. Kg Device for drying objects, in particular painted vehicle bodies
DE102004025525B3 (en) 2004-05-25 2005-12-08 Eisenmann Maschinenbau Gmbh & Co. Kg Method and device for drying objects, in particular painted vehicle bodies
DE102007007478B3 (en) * 2007-02-15 2008-05-29 Eisenmann Anlagenbau Gmbh & Co. Kg Article e.g. painted vehicle body, drying device, has inlet-lock and outlet-lock regions including locking chambers with units provided in position to change volume for displacing air contained in respective locking chamber

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103398558A (en) * 2013-07-24 2013-11-20 深圳市信宇人科技有限公司 Full-automatic combining module new energy material vacuum baking method and vacuum baking line
CN103398558B (en) * 2013-07-24 2016-05-25 深圳市信宇人科技有限公司 Full-automatic composite module new energy materials vacuum bakeout method and vacuum bakeout line
EP4036506A3 (en) * 2015-07-31 2022-10-12 Dürr Systems AG Treatment system and method for treating workpieces
US11740021B2 (en) 2015-07-31 2023-08-29 Dürr Systems Ag Treatment installation and method for treating workpieces

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EP2083235A1 (en) 2009-07-29

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