EP0455111B1 - Plant for coating series of work pieces with conductive coating material - Google Patents
Plant for coating series of work pieces with conductive coating material Download PDFInfo
- Publication number
- EP0455111B1 EP0455111B1 EP91106544A EP91106544A EP0455111B1 EP 0455111 B1 EP0455111 B1 EP 0455111B1 EP 91106544 A EP91106544 A EP 91106544A EP 91106544 A EP91106544 A EP 91106544A EP 0455111 B1 EP0455111 B1 EP 0455111B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- intermediate container
- container
- installation
- coating
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000011248 coating agent Substances 0.000 title claims description 37
- 238000000576 coating method Methods 0.000 title claims description 37
- 239000000463 material Substances 0.000 title claims description 13
- 239000007921 spray Substances 0.000 claims description 14
- 239000011810 insulating material Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims 10
- 239000012799 electrically-conductive coating Substances 0.000 claims 1
- 238000010079 rubber tapping Methods 0.000 claims 1
- 238000009413 insulation Methods 0.000 description 4
- 239000003086 colorant Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010292 electrical insulation Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009503 electrostatic coating Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/16—Arrangements for supplying liquids or other fluent material
- B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
- B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
- B05B5/1625—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom
Definitions
- the invention relates to a system according to the preamble of claim 1.
- the spray head of rotary atomizers or the like is connected to high voltage in order to thereby generate the field which charges the sprayed coating particles between the spray head and the grounded object to be coated.
- a coating material of high electrical conductivity such as the environmentally friendly water-soluble paints
- the insulation resistance via the line connecting the spray head to the paint supply system is too low if the supply system is at ground potential.
- the supply system which usually consists of ring lines for the individual colors, is to be grounded, since otherwise not only would considerable expenditure of insulation be required, but there would also be a risk of explosive discharges due to the large electrical capacity.
- a separate storage container for each color, which is arranged insulated from earth and from the other containers and via a color changer and a connecting line which is at high voltage potential horizontal spray device feeds.
- the connecting line is flushed with a given color and before changing to a different color with solvent (water) and dried with compressed air in order to maintain the required insulation for the container subsequently connected to the spraying device.
- solvent water
- this system is structurally complex and bulky. There are also color losses when emptying and flushing the insulating lines and the need to dispose of the flushing agent.
- the same problem occurs with a method known from DE-A-37 17 929, in which the color changer of an earthed supply system leads to an intermediate container and from there leads to the spraying device for electrical insulation and is dried.
- the invention has for its object to provide a system that requires little space and little construction.
- the invention has the advantage that you can get by with a convenient design of the system with a single intermediate container (for each of the selectable coating materials of different colors and possibly per "level" of several atomizers in a spray booth), without this configuration being necessary when Fill the intermediate container to switch off the high voltage.
- the system can be made even simpler if the high voltage is switched off when the intermediate container is being filled.
- an additional storage container serving as a buffer is connected downstream of the outlet of the intermediate container, one is no longer dependent on coating breaks for the movements of the intermediate container; this also gives the possibility of a single common intermediate container arrangement (per color) for all connected atomizers, e.g. to be used for all "levels" consisting of several atomizers in one spray booth.
- an earthed supply system of which only one filling valve 1 with a material supply line 2 is shown, is intended to supply a device, which is connected to a coating device which is at high voltage during operation and, in the example shown, contains a removal valve 4 with a line 5 leading to the coating device (not shown).
- An intermediate container 7 is used for electrical insulation between the grounded supply system and the device connected to high voltage, which is periodically filled alternately by the supply system in a manner known per se, the contents of which are grounded, and then emptied in the direction of the coating device, the contents of which the high voltage of the coating device is charged and isolated from the supply system.
- the intermediate container 7 shown is an elongated, with the exception of closable inlets and outlets for coating material and air completely closed cylinder with a round, flat or any other cross-section, which is pivotally mounted about a horizontal axis 8 lying transversely to its longitudinal axis, for example on a Foot 9 made of insulating material standing vertically on the floor. According to a practical example, it can be dimensioned for a content of about 4 liters.
- the intermediate container 7 is mounted approximately at the middle between its two ends, at each of which there is a valve 11 or 12, of which one valve 11 serves as the inlet and the other valve 12 serves as the outlet of the intermediate container 7.
- the valve 11 can be coupled and detached from the fixed filling valve 1, while the valve 12 can be detachably coupled in a similar manner to the removal valve 4, which stands on an isolator 14, since it is separated from the conductive coating material by the Sprayer leading line at Coating operation is placed on high voltage.
- the mouths of the valves 11 and 12 are inclined in the pivoting plane of the intermediate container 7 as shown at such an angle against the longitudinal axis of the container that they are aligned with the mouth of the fixed valve 1 or 4 when coupling.
- Coupling together can be facilitated by conical or appropriately funnel-shaped design of the mouths.
- By appropriate design of the valves can be ensured that when coupling together a liquid-tight liquid connection between the valve 11 and the line 2 or between the valve 12 and the line 5 and the valves 11 and 12 and 1 and 4 each automatically close when the valve 11 or 12 is uncoupled by the pivoting movements of the intermediate container 7 and pivoted away.
- a preferably pneumatic piston-cylinder unit 14 is provided, which is located on the one hand on the foot 9 and on the other hand is supported on the intermediate container 7.
- the arrangement shown can be in its entirety, that is to say including the additional intermediate containers required for further selectable coating materials of a different color, in a completely closed housing 16 made of insulating material, which is arranged on one side or preferably as part of a spray booth.
- the line 5 is led through the wall of this housing into the spray booth, where it can supply at least one "level" from several atomizers.
- the height of the housing 16 can be of the order of 1 m.
- the distance between the grounded fill valve and the inlet valve 11 of the The intermediate container 7 is sufficiently larger than the flashover distance of the high voltage applied when the intermediate container is pivoted into the emptying position shown.
- the intermediate container 7 can be quickly and easily pivoted into its filling position and pivoted back into the emptying position shown, for which purpose the coating breaks can be used, for example, in the embodiment shown, in which the group of spray devices of a "level" after coating a vehicle body in a spray booth waiting for the next body.
- Filling the intermediate container 7 through the supply system, which is usually under pressure (e.g. 6.105 Pa, i.e. 6 bar), via the automatically connectable valves 1 and 11 requires little time.
- the intermediate container 7 For emptying the intermediate container 7, it can be expediently placed under regulated pressure, which has the advantage that it does not have to be followed by a pump or the like provided for this purpose.
- the intermediate container 7 is designed to be pressure-tight and, when emptied, it is closed air-tight and provided with an inlet valve (not shown) for compressed air. Furthermore, a vent valve (also not shown) is provided for the filling process.
- the pressure set in the intermediate container 7 is expediently lower than that of the supply system, e.g. about 2-4.5.105 Pa.
- the illustrated embodiment can be simplified to the extent that the intermediate container 7 instead of the couplable valves 12 and 4 at its outlet is also constantly liquid-tight could be connected to the line 5 leading to the coating device.
- This connection would then be arranged to be movable or flexible so that it could follow the pivoting movements of the intermediate container; for example, it could consist of a flexible piece of hose firmly connected to the intermediate container. It may be more convenient to move the pivot axis of the intermediate container in the vicinity of its outlet end.
- the conductive coating material in operation always leads to a conductive connection from the coating device to the intermediate container, the high voltage is switched off when the intermediate container is filled, for example during the above-mentioned coating breaks in a spray booth.
- the intermediate container 7 which serves as a buffer container for supplying the coating device when the intermediate container is being filled and enables non-stop coating operation.
- the buffer tank (not shown) could be connected to line 5, for example.
- a buffer container is particularly useful in the illustrated embodiment with the outlet of the intermediate container 7 that can be uncoupled from the removal valve 4. If the buffer tank e.g. is connected to this at the end of line 5 or at another point, there is the possibility, during breaks in operation, to periodically pressurize line 5 by periodically changing pressure of the buffer store, whereby line 5 prevents the coating material from settling and its viscosity can be maintained .
Landscapes
- Electrostatic Spraying Apparatus (AREA)
Description
Die Erfindung betrifft eine Anlage gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a system according to the preamble of claim 1.
In üblichen elektrostatischen Beschichtungsanlagen, wie sie insbesondere zum Lackieren von Fahrzeugrohkarossen verwendet werden, legt man den Sprühkopf von Rotationszerstäubern od. dgl. an Hochspannung, um dadurch das die versprühten Beschichtungspartikel aufladende Feld zwischen dem Sprühkopf und dem geerdeten, zu beschichtenden Gegenstand zu erzeugen. Hierbei tritt das Problem auf, daß bei Verwendung eines Beschichtungsmaterials hoher elektrischer Leitfähigkeit wie namentlich der umweltfreundlichen wasserlöslichen Lacke der Isolationswiderstand über die den Sprühkopf mit dem Lackversorgungssystem verbindende Leitung zu gering ist, wenn das Versorgungssystem auf Erdpotential liegt. Das gewöhnlich aus Ringleitungen für die einzelnen Farben bestehende Versorgungssystem soll geerdet sein, da andernfalls nicht nur erheblicher Isolationsaufwand erforderlich wäre, sondern auch wegen der großen elektrischen Kapazität die Gefahr explosionsartiger Entladungen bestehen würde.In conventional electrostatic coating systems, such as those used in particular for painting vehicle bodies, the spray head of rotary atomizers or the like is connected to high voltage in order to thereby generate the field which charges the sprayed coating particles between the spray head and the grounded object to be coated. The problem arises here that when using a coating material of high electrical conductivity, such as the environmentally friendly water-soluble paints, the insulation resistance via the line connecting the spray head to the paint supply system is too low if the supply system is at ground potential. The supply system, which usually consists of ring lines for the individual colors, is to be grounded, since otherwise not only would considerable expenditure of insulation be required, but there would also be a risk of explosive discharges due to the large electrical capacity.
Bei einer aus der DE-A-30 14 221 bekannten Beschichtungsanlage für elektrisch leitfähige Materialien ist für jede Farbe ein eigener Vorratsbehälter vorgesehen, der gegen Erde und gegen die jeweils anderen Behälter isoliert angeordnet ist und über einen Farbwechsler und eine Verbindungsleitung die auf Hochspannungspotential liegende Sprühvorrichtung speist. Die Verbindungsleitung wird nach Beendigung des Beschichtungsbetriebes mit einer gegebenen Farbe und vor dem Wechsel zu einer anderen Farbe mit Lösungsmittel (Wasser) gespült und mit Druckluft getrocknet, um die erforderliche Isolierung zu dem anschließend mit der Sprühvorrichtung verbundenen Behälter aufrechtzuerhalten. Insbesondere bei einer großen Anzahl wählbarer Farben und entsprechender Behälter ist diese Anlage baulich aufwendig und sperrig. Ferner ergeben sich Farbverluste beim Entleeren und Spülen der isolierenden Leitungen und die Notwendigkeit der Entsorgung des Spülmittels. Dasselbe Problem tritt bei einem aus der DE-A-37 17 929 bekannten Verfahren auf, bei dem vom Farbwechsler eines geerdeten Versorgungssystems zu einem Zwischenbehälter und von diesem zur Sprühvorrichtung führende Leitungen zur elektrischen Isolation gespült und getrocknet werden.In a coating system for electrically conductive materials known from DE-A-30 14 221, a separate storage container is provided for each color, which is arranged insulated from earth and from the other containers and via a color changer and a connecting line which is at high voltage potential horizontal spray device feeds. After the coating operation has ended, the connecting line is flushed with a given color and before changing to a different color with solvent (water) and dried with compressed air in order to maintain the required insulation for the container subsequently connected to the spraying device. In particular with a large number of selectable colors and corresponding containers, this system is structurally complex and bulky. There are also color losses when emptying and flushing the insulating lines and the need to dispose of the flushing agent. The same problem occurs with a method known from DE-A-37 17 929, in which the color changer of an earthed supply system leads to an intermediate container and from there leads to the spraying device for electrical insulation and is dried.
Dieses Problem wird teilweise bei einem aus der DE-C-29 00 660 bekannten System vermieden, bei dem das Beschichtungsmaterial von einer geerdeten Ringleitung zunächst in einen isoliert angeordneten ersten Zwischenbehälter gelangt und aus diesem dann in einen zweiten Zwischenbehälter, dessen Ausgang ständig mit der auf Hochspannung liegenden Sprühvorrichtung verbunden ist. Durch ausreichend großen Abstand und zweckmäßig bewegbare Verbindungsrohre oder durch Auf- und Abbewegen des ersten Zwischenbehälters wird beim Füllen des ersten Zwischenbehälters dessen Inhalt vom zweiten Zwischenbehälter elektrisch isoliert und beim Füllen des an Hochspannung liegenden zweiten Zwischenbehälters der erste Zwischenbehälter vom geerdeten Vorratssystem isoliert. Der erste Zwischenbehälter wird vor dem Entleeren in den zweiten Zwischenbehälter elektrisch aufgeladen, um Spannungsüberschläge zu vermeiden. Das bekannte System ist aber baulich aufwendig und wegen des zur Isolation notwendigen Abstands zwischen den beiden Zwischenbehältern sehr sperrig.This problem is partially avoided in a system known from DE-C-29 00 660, in which the coating material first arrives from an earthed ring line in an insulated first intermediate container and then from this into a second intermediate container, the output of which is constantly the same High voltage lying spray device is connected. By a sufficiently large distance and expediently movable connecting pipes or by moving the first intermediate container up and down, the contents of the first intermediate container are electrically insulated from the second intermediate container and the first intermediate container is isolated from the grounded storage system when the second intermediate container, which is connected to high voltage, is filled. The first intermediate container is electrically charged before emptying into the second intermediate container in order to avoid flashovers. However, the known system is structurally complex and very bulky because of the distance between the two intermediate containers required for insulation.
Ausgehend von dem aus der erwähnten DE-C-29 00 660 bekannten System liegt der Erfindung die Aufgabe zugrunde, eine Anlage zu schaffen, die mit geringem Platzbedarf und wenig Bauaufwand auskommt.Starting from the system known from the aforementioned DE-C-29 00 660, the invention has for its object to provide a system that requires little space and little construction.
Diese Aufgabe wird durch die im Anspruch 1 gekennzeichnete Anlage gelöst.This object is achieved by the system characterized in claim 1.
Die Erfindung hat den Vorteil, daß man bei zweckmäßiger Ausgestaltung der Anlage mit einem einzigen Zwischenbehälter (für jedes der auswählbaren Beschichtungsmaterialien unterschiedlicher Farbe und ggf. pro "Ebene" mehrerer Zerstäuber in einer Sprühkabine) auskommt, ohne daß es bei dieser Ausgestaltung erforderlich ist, beim Füllen des Zwischenbehälters die Hochspannung abzuschalten. Gemäß einer anderen Ausführungsform der Erfindung kann die Anlage noch einfacher ausgestaltet sein, wenn die Hochspannung beim Füllen des Zwischenbehälters abgeschaltet wird. Wenn man andererseits gemäß einer Weiterbildung der Erfindung dem Auslaß des Zwischenbehälters einen als Puffer dienenden zusätzlichen Vorratsbehälter nachschaltet, ist man für die Bewegungen des Zwischenbehälters nicht mehr auf Beschichtungspausen angewiesen; hieraus ergibt sich dann auch die Möglichkeit, eine einzige gemeinsame Zwischenbehälteranordnung (pro Farbe) für alle angeschlossenen Zerstäuber, also z.B. für alle "Ebenen" aus jeweils mehreren Zerstäubern in einer Sprühkabine zu verwenden.The invention has the advantage that you can get by with a convenient design of the system with a single intermediate container (for each of the selectable coating materials of different colors and possibly per "level" of several atomizers in a spray booth), without this configuration being necessary when Fill the intermediate container to switch off the high voltage. According to another embodiment of the invention, the system can be made even simpler if the high voltage is switched off when the intermediate container is being filled. If, on the other hand, according to a development of the invention, an additional storage container serving as a buffer is connected downstream of the outlet of the intermediate container, one is no longer dependent on coating breaks for the movements of the intermediate container; this also gives the possibility of a single common intermediate container arrangement (per color) for all connected atomizers, e.g. to be used for all "levels" consisting of several atomizers in one spray booth.
An einem in der Zeichnung schematisch dargestellten Ausführungsbeispiel wird die Erfindung näher erläutert.The invention is explained in more detail using an exemplary embodiment shown schematically in the drawing.
Bei der hier beschriebenen Anlage soll ein geerdetes Versorgungssystem, von dem nur ein Füllventil 1 mit einer Materialzufuhrleitung 2 dargestellt ist, eine Einrichtung versorgen, die mit einer im Betrieb auf Hochspannung liegenden Beschichtungsvorrichtung verbunden ist und bei dem dargestellten Beispiel ein Entnahmeventil 4 mit einer zur Beschichtungssvorrichtung (nicht dargestellt) führenden Leitung 5 enthält. Zur elektrischen Isolierung zwischen dem geerdeten Versorgungssystem und der auf Hochspannung gelegten Einrichtung dient ein Zwischenbehälter 7, der in an sich bekannter Weise periodisch abwechselnd vom Versorgungssystem gefüllt wird, wobei sein Inhalt geerdet ist, und danach in Richtung zur Beschichtungsvorrichtung entleert wird, wobei sein Inhalt auf die Hochspannung der Beschichtungsvorrichtung aufgeladen wird und vom Versorgungssystem isoliert ist.In the system described here, an earthed supply system, of which only one filling valve 1 with a material supply line 2 is shown, is intended to supply a device, which is connected to a coating device which is at high voltage during operation and, in the example shown, contains a
Der dargestellte Zwischenbehälter 7 ist ein langgestreckter, mit Ausnahme von verschließbaren Ein- und Auslässen für Beschichtungsmaterial und Luft vollständig geschlossener Zylinder mit rundem, flachem oder beliebigem sonstigen Querschnitt, der um eine quer zu seiner Längsachse liegende horizontale Achse 8 schwenkbar gelagert ist, beispielsweise auf einem vertikal auf den Boden stehenden Fuß 9 aus Isoliermaterial. Gemäß einem praktischen Beispiel kann er für einen Inhalt von etwa 4 l bemessen sein.The intermediate container 7 shown is an elongated, with the exception of closable inlets and outlets for coating material and air completely closed cylinder with a round, flat or any other cross-section, which is pivotally mounted about a horizontal axis 8 lying transversely to its longitudinal axis, for example on a
Bei der dargestellten Ausführungsform ist der Zwischenbehälter 7 etwa an der Mitte zwischen seinen beiden Enden gelagert, an denen sich jeweils ein Ventil 11 bzw. 12 befindet, von denen das eine Ventil 11 als Einlaß und das andere Ventil 12 als Auslaß des Zwischenbehälters 7 dient. Je nach den Schwenkbewegungen ist das Ventil 11 mit dem feststehenden Füllventil 1 kuppelbar und von ihm lösbar, während das Ventil 12 in ähnlicher Weise lösbar mit dem Entnahmeventil 4 kuppelbar ist, das auf einem Isolator 14 steht, da es von dem leitenden Beschichtungsmaterial über die zur Sprühvorrichtung führende Leitung beim Beschichtungsbetrieb auf Hochspannung gelegt wird. Die Mündungen der Ventile 11 und 12 sind in der Schwenkebene des Zwischenbehälters 7 darstellungsgemäß mit einem solchen Winkel gegen die Behälterlängsachse geneigt, daß sie beim Ankuppeln an das feststehende Ventil 1 bzw. 4 mit dessen Mündung fluchten. Durch konische bzw. entsprechend trichterförmige Gestaltung der Mündungen kann das Zusammenkuppeln erleichtert werden. Durch entsprechende konstruktive Ausgestaltung der Ventile kann dafür gesorgt werden, daß beim Zusammenkuppeln selbsttätig eine flüssigkeitsdichte Flüssigkeitsverbindung zwischen dem Ventil 11 und der Leitung 2 bzw. zwischen dem Ventil 12 und der Leitung 5 zustande kommt und die Ventile 11 und 12 sowie 1 und 4 jeweils selbsttätig schließen, wenn das Ventil 11 bzw. 12 durch die Schwenkbewegungen des Zwischenbehälters 7 abgekuppelt und weggeschwenkt wird.In the embodiment shown, the intermediate container 7 is mounted approximately at the middle between its two ends, at each of which there is a
Zum Verschwenken des Zwischenbehälters 7 zwischen seiner ersten Position, in der er vom Versorgungssystem gefüllt wird, und der dargestellten zweiten Position, in der er entleert wird, ist eine vorzugsweise pneumatisch arbeitende Kolben-Zylindereinheit 14 vorgesehen, die sich einerseits an dem Fuß 9 und andererseits am Zwischenbehälter 7 abstützt.To pivot the intermediate container 7 between its first position, in which it is filled by the supply system, and the illustrated second position, in which it is emptied, a preferably pneumatic piston-cylinder unit 14 is provided, which is located on the one hand on the
Die dargestellte Anordnung kann sich in ihrer Gesamtheit, also einschließlich der für weitere wählbare Beschichtungsmaterialien anderer Farbe benötigten weiteren Zwischenbehälter, in einem vollständig geschlossenen Gehäuse 16 aus Isoliermaterial befinden, das an einer Seite oder vorzugsweise als Bestandteil einer Sprühkabine angeordnet ist. Die Leitung 5 ist durch die Wand dieses Gehäuses in die Sprühkabine hindurchgeführt, wo sie mindestens eine "Ebene" aus mehreren Zerstäubern versorgen kann. Bei einem praktischen Beispiel kann die Höhe des Gehäuses 16 in der Größenordnung von 1 m liegen. Der Abstand zwischen dem geerdeten Füllventil und dem Einlaßventil 11 des Zwischenbehälters 7 ist ausreichend größer als die Überschlagweite der angelegten Hochspannung, wenn der Zwischenbehälter in die dargestellte Entleerungsposition geschwenkt ist.The arrangement shown can be in its entirety, that is to say including the additional intermediate containers required for further selectable coating materials of a different color, in a completely closed
Im Betrieb kann der Zwischenbehälter 7 schnell und problemlos in seine Füllposition geschwenkt und in die dargestellte Entleerungsposition zurückgeschwenkt werden, wofür bei der dargestellten Ausführungsform beispielsweise die Beschichtungspausen genutzt werden können, in denen in einer Sprühkabine die Gruppe von Sprühvorrichtungen einer "Ebene" nach Beschichtung einer Fahrzeugkarosse auf die jeweils nächste Karosse wartet. Auch das Füllen des Zwischenbehälters 7 durch das üblicherweise unter Druck (z.B. 6.10⁵ Pa, also 6 bar) stehende Versorgungssystem über die selbsttätig kuppelbaren Ventile 1 und 11 erfordert wenig Zeit.In operation, the intermediate container 7 can be quickly and easily pivoted into its filling position and pivoted back into the emptying position shown, for which purpose the coating breaks can be used, for example, in the embodiment shown, in which the group of spray devices of a "level" after coating a vehicle body in a spray booth waiting for the next body. Filling the intermediate container 7 through the supply system, which is usually under pressure (e.g. 6.10⁵ Pa, i.e. 6 bar), via the automatically connectable valves 1 and 11 requires little time.
Zum Entleeren des Zwischenbehälters 7 kann dieser zweckmäßig unter geregelten Druck gesetzt werden, was den Vorteil hat, daß ihm zum Entleeren keine eigens hierfür vorgesehene Pumpe od. dgl. nachgeschaltet werden muß. Zu diesem Zweck ist der Zwischenbehälter 7 druckfest ausgebildet und beim Entleeren luftdicht geschlossen und mit einem (nicht dargestellten) Einlaßventil für Druckluft versehen. Ferner ist ein (ebenfalls nicht dargestelltes) Entlüftungsventil für den Füllvorgang vorgesehen. Der im Zwischenbehälter 7 eingestellte Druck ist zweckmäßig geringer als der des Versorgungssystems, z.B. etwa 2-4,5.10⁵ Pa. Statt der Druckentleerung ist es aber auch möglich, einen drucklosen Zwischenbehälter mit einer dem Entnahmeventil nachgeschalteten, beispielsweise pneumatisch arbeitenden Förderpumpe bekannter Art zu entleeren.For emptying the intermediate container 7, it can be expediently placed under regulated pressure, which has the advantage that it does not have to be followed by a pump or the like provided for this purpose. For this purpose, the intermediate container 7 is designed to be pressure-tight and, when emptied, it is closed air-tight and provided with an inlet valve (not shown) for compressed air. Furthermore, a vent valve (also not shown) is provided for the filling process. The pressure set in the intermediate container 7 is expediently lower than that of the supply system, e.g. about 2-4.5.10⁵ Pa. Instead of emptying the pressure, it is also possible to empty an unpressurized intermediate container with a known type of downstream feed pump, for example a pneumatically operating feed pump.
Das dargestellte Ausführungsbeispiel läßt sich insofern noch vereinfachen, als der Zwischenbehälter 7 statt der kuppelbaren Ventile 12 und 4 an seinem Auslaß auch ständig flüssigkeitsdicht mit der zur Beschichtungsvorrichtung führenden Leitung 5 verbunden sein könnte. Diese Verbindung wäre dann bewegbar oder flexibel angeordnet, so daß sie den Schwenkbewegungen des Zwischenbehälters folgen könnte; beispielsweise könnte sie aus einem fest mit dem Zwischenbehälter verbundenen flexiblen Schlauchstück bestehen. Hierbei kann es zweckmäßiger sein, die Schwenkachse des Zwischenbehälters in die Nähe seines Auslaßendes zu verlegen. Da in diesem Fall im Betrieb ständig durch das leitende Beschichtungsmaterial eine leitende Verbindung von der Beschichtungsvorrichtung zum Zwischenbehälter besteht, wird die Hochspannung beim Füllen des Zwischenbehälters abgeschaltet, beispielsweise während der oben erwähnten Beschichtungspausen in einer Sprühkabine.The illustrated embodiment can be simplified to the extent that the intermediate container 7 instead of the
Andererseits besteht die eingangs schon erwähnte Möglichkeit, dem Zwischenbehälter 7 einen zusätzlichen Vorratsbehälter nachzuschalten, der als Pufferbehälter zur Versorgung der Beschichtungsvorrichtung beim Füllen des Zwischenbehälters dient und einen pausenlosen Beschichtungsbetrieb ermöglicht. Der (nicht dargestellte) Pufferbehälter könnte beispielsweise an die Leitung 5 angeschlossen sein. Ein Pufferbehälter ist vor allem bei dem dargestellten Ausführungsbeispiel mit vom Entnahmeventil 4 abkuppelbarem Auslaß des Zwischenbehälters 7 sinnvoll. Wenn der Pufferbehälter z.B. am Ende der Leitung 5 oder an sonstiger Stelle an diese angeschlossen ist, besteht die Möglichkeit, in Betriebspausen die Leitung 5 durch periodisch wechselnden Druck des Pufferspeichers entsprechend periodisch zu beaufschlagen, wodurch in der Leitung 5 ein Absetzen des Beschichtungsmaterials vermieden und dessen Viskosität erhalten bleiben kann.On the other hand, there is the possibility already mentioned at the outset of connecting an additional storage container to the intermediate container 7, which serves as a buffer container for supplying the coating device when the intermediate container is being filled and enables non-stop coating operation. The buffer tank (not shown) could be connected to line 5, for example. A buffer container is particularly useful in the illustrated embodiment with the outlet of the intermediate container 7 that can be uncoupled from the
Claims (10)
- Coating installation for serially coating workpieces with electrically conductive coating material with a supply system (1) at a low potential or earth potential, a coating device to which, in use, a high voltage is applied and an intermediate container (7) which is movable between two positions and to which, in the first position, the coating material is fed through an inlet (11) from an outlet of the supply system (1) and which, in its second position, in which its contents are electrically insulated from the outlet of the supply system (1), delivers the coating material into a device (4) connected to the coating device, characterised in that the intermediate container (7) is an elongate, closed cylinder which is pivotable between its two positions about an axis (8) extending transverse to its longitudinal axis.
- Installation as claimed in claim 1, characterised in that the outlet of the supply system is constituted by a fixed filling valve (1), with which a valve (11), which constitutes the inlet of the intermediate container (7), may be automatically coupled in a liquid-tight manner in the first position for filling the intermediate container and that the valves (1,11) close automatically when the intermediate container (7) is pivoted into the second position.
- Installations as claimed in claim 1 or 2, characterised in that the inlet of the device connected to the coating device is constituted by a fixed tapping valve (4), with which a valve (12), which constitutes the outlet of the intermediate container (7), may be automatically coupled in a liquid-tight manner, in the second pivotal position, for emptying the intermediate container (7) and that these valves (4,12) close automatically when the intermediate container (7) pivots into the first position.
- Installation as claimed in claim 1 or 2, characterised in that the outlet of the intermediate container (7) is always connected, in use, in a liquid-tight manner to a conduit (5) leading to the coating device and that this connection is movably or flexibly arranged so that it follows the pivotal movements of the intermediate container (7).
- Installation as claimed in one of the preceding claims, characterised in that provided on one and/or the other opposite end of the intermediate container (7) there is a valve (11,12), the orifice of which is inclined in the pivotal plane of the intermediate container (7) with respect to the longitudinal axis of the container at such an angle that when it is coupled to a fixed valve (1,4) it is aligned with it.
- Installation as claimed in one of the preceding claims, characterised in that the intermediate container (7) is mounted on a support (9) of insulating material and may be pivoted by a piston/cylinder unit (14).
- Installation as claimed in one of the preceding claims, characterised in that the intermediate container (7) and its pivoting mechanism are arranged in a housing (16) of insulating material as part of a spray booth and a conduit (5) leads from the outlet of the intermediate container (7) or a valve (4) which may be coupled to it into the spray booth to the coating device.
- Installation as claimed in one of the preceding claims, characterised in that the intermediate container (7) is constructed to be sealable in an air-tight manner and pressure-resistant, has inlet and outlet valves for air and may be emptied by the application of pressure.
- Installation as claimed in one of the preceding claims, characterised in that the device which is supplied by the intermediate container (7) and is connected to the coating device includes an additional supply container which serves as a buffer container for supplying the coating device when filling the intermediate container (7).
- Installation as claimed in claim 9, characterised in that the buffer container may be sealed in an air-tight manner and may be emptied by the application of pressure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4013941 | 1990-04-30 | ||
| DE4013941A DE4013941A1 (en) | 1990-04-30 | 1990-04-30 | PLANT FOR SERIES COATING OF WORKPIECES WITH CONDUCTIVE COATING MATERIAL |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0455111A1 EP0455111A1 (en) | 1991-11-06 |
| EP0455111B1 true EP0455111B1 (en) | 1994-09-07 |
Family
ID=6405491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91106544A Expired - Lifetime EP0455111B1 (en) | 1990-04-30 | 1991-04-23 | Plant for coating series of work pieces with conductive coating material |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0455111B1 (en) |
| DE (2) | DE4013941A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2282085A (en) * | 1993-08-18 | 1995-03-29 | John Stephen Griffiths | Paint supply apparatus |
| DE19610588B4 (en) * | 1996-03-18 | 2010-08-05 | Dürr Systems GmbH | Coating machine with replaceable container |
| DE19610589A1 (en) * | 1996-03-18 | 1997-09-25 | Duerr Gmbh & Co | Process and system for supplying paint to a coating system |
| DE19632326C1 (en) * | 1996-08-10 | 1998-01-15 | Herberts Gmbh | Paint line for series-painting of road vehicle bodywork and parts |
| DE19632325A1 (en) * | 1996-08-10 | 1998-02-12 | Herberts Gmbh | Paint supply unit for paint-spray in car production line |
| AU4378997A (en) | 1996-08-10 | 1998-03-06 | Herberts Gesellschaft Mit Beschrankter Haftung | Painting device and method |
| DE19704829A1 (en) * | 1997-02-08 | 1998-08-20 | Herberts Gmbh | Painting device |
| DE19756488A1 (en) | 1997-12-18 | 1999-07-01 | Lactec Gmbh | Method and device for isolating an electrically conductive flow medium |
| DE10064065B4 (en) * | 1999-12-22 | 2006-07-27 | Dürr Systems GmbH | Coating system for automated coating technology |
| DE10010175B4 (en) * | 2000-03-02 | 2016-09-29 | Dürr Systems GmbH | Coating material change system and coating system for automated coating technology as well as methods for automated coating |
| DE10120077B4 (en) * | 2001-04-24 | 2006-07-27 | Dürr Systems GmbH | Coating system for automated coating technology |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3122320A (en) * | 1958-03-20 | 1964-02-25 | Ford Motor Co | Method for filling electrically charged receptacle |
| US3892357A (en) * | 1974-04-30 | 1975-07-01 | Nordson Corp | Electrostatic spray apparatus and method |
| US4085892A (en) * | 1976-04-21 | 1978-04-25 | Dalton Robert E | Continuously energized electrostatic coating voltage block |
| NL187613C (en) * | 1978-01-11 | 1991-12-02 | Akzo Nv | DEVICE FOR ELECTROSTATIC SPRAYING OF ELECTRICALLY CONDUCTIVE PAINT. |
| US4232055A (en) * | 1979-04-24 | 1980-11-04 | Champion Spark Plug Company | Automatic color change electrostatic paint spray system |
| DE3440381A1 (en) * | 1984-11-05 | 1986-05-07 | Ransburg Gmbh, 6056 Heusenstamm | METHOD AND DEVICE FOR AUTOMATIC ELECTROSTATIC SPRAY COATING |
| DE3717929A1 (en) * | 1987-05-27 | 1988-12-08 | Behr Industrieanlagen | Process and system for electrostatic coating with conductive material |
| DE3831785A1 (en) * | 1988-09-19 | 1990-03-29 | Lenhardt Maschinenbau | Process and device for refilling a high-viscosity pasty substance into an accumulator of an apparatus for applying this substance to workpieces |
-
1990
- 1990-04-30 DE DE4013941A patent/DE4013941A1/en not_active Withdrawn
-
1991
- 1991-04-23 DE DE59102796T patent/DE59102796D1/en not_active Expired - Fee Related
- 1991-04-23 EP EP91106544A patent/EP0455111B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0455111A1 (en) | 1991-11-06 |
| DE59102796D1 (en) | 1994-10-13 |
| DE4013941A1 (en) | 1991-10-31 |
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