EP2146802B1 - Piston rod seal for an insulating cylinder of a coating plant - Google Patents

Piston rod seal for an insulating cylinder of a coating plant Download PDF

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Publication number
EP2146802B1
EP2146802B1 EP08749428A EP08749428A EP2146802B1 EP 2146802 B1 EP2146802 B1 EP 2146802B1 EP 08749428 A EP08749428 A EP 08749428A EP 08749428 A EP08749428 A EP 08749428A EP 2146802 B1 EP2146802 B1 EP 2146802B1
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EP
European Patent Office
Prior art keywords
piston rod
seal
leakage
piston
sealing
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EP08749428A
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German (de)
French (fr)
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EP2146802A2 (en
Inventor
Frank Herre
Rainer Melcher
Manfred Michelfelder
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Duerr Systems AG
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Duerr Systems AG
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Priority to PL08749428T priority Critical patent/PL2146802T3/en
Publication of EP2146802A2 publication Critical patent/EP2146802A2/en
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • 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
    • B05B5/1675—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive the supply means comprising a piston, e.g. a piston pump

Definitions

  • the invention relates to a piston rod seal for an insulating cylinder of an electrostatic coating system and a corresponding operating method according to the independent claims.
  • Out DE 10 2005 048 223 A1 is a painting known in which a paint memory is connected via an isolation cylinder with a downstream paint dosing, wherein the paint dosing metered metered the paint to be applied and fed to a rotary atomizer or other application device.
  • the insulation cylinder in this case allows electrical isolation of the paint dosing relative to the paint reservoir. This is advantageous because the Lackdosierer is usually at high voltage potential in an electrostatic painting process, while the paint reservoir electrically insulated paint storage is at ground potential and therefore can be refilled during the painting process.
  • the paint residues located in the insulation cylinder are removed by a stripping piston from the inner wall of the insulation cylinder to produce the required dielectric strength.
  • the stripping piston is in this case attached to one end of a piston rod which is displaceably mounted in a piston rod guide and carries at its other end a pneumatic piston which can be pneumatically driven in a pneumatic cylinder to move the stripping piston in the insulating cylinder.
  • the invention is therefore based on the object to improve the above-described known isolation cylinder accordingly.
  • the invention comprises the general technical teaching that the piston rod seal not only has a single seal, but at least two seals, which are arranged offset in the axial direction.
  • the additional seal offers increased safety, since the sealing function is not impaired even if a seal fails.
  • the inventive arrangement of several spatially separated seals allows error monitoring by the gap between the two seals is monitored for leakage.
  • a leakage space is preferably arranged in the axial direction between the two seals, wherein the leakage space is located in the radial direction between the piston rod guide and the lateral surface of the piston rod and absorbs leakage of the paint passing through in case of leakage of the paint-side seal.
  • a leakage bore extends from the leakage space to dissipate the leakage entering the leakage space.
  • the leakage hole can be used to detect leakage.
  • the leakage bore lead, for example, to a sensor, which may be, for example, a pressure sensor or a humidity sensor. If the leak sensor detects a leak, the piston rod seal is replaced at the earliest opportunity, which may occur, for example, during normal business interruptions at night or at the weekend, so that the regular painting operation is not affected by a leakage in the piston rod seal.
  • the piston rod preferably carries on the opposite side of the stripping a pneumatic piston which is slidably disposed in a pneumatic cylinder and can be pressurized to move the pneumatic piston and thus the piston rod and the stripping piston in the axial direction.
  • the piston rod seal according to the invention preferably has a further seal, which is axially offset from the two above-mentioned redundant seals and has the task to seal against the pneumatic cylinder.
  • the piston rod seal so three seals, namely two wet paint seals on the side of the Abstreifkolbens or on the side of the insulating cylinder and at least one pneumatic seal on the side of the pneumatic cylinder. Furthermore, it is advantageous in the context of the invention if the seals have a plurality of sealing edges, whereby the life of the seals is increased. In the preferred embodiment of the invention, therefore, the wet paint seals each have double sealing edges.
  • wet paint seals are preferably made of a thermoplastic sealing material, such as polytetrafluoroethylene (PTFE) or polyethylene (PE).
  • PTFE polytetrafluoroethylene
  • PE polyethylene
  • the invention is not limited to the above-mentioned examples in terms of the sealing material, but in principle can be realized with other sealing materials.
  • the seals can optionally be supported by a metal spring to achieve a satisfactory sealing effect.
  • the piston rod has a low surface roughness on its lateral surface with a roughness Rz ⁇ 20 ⁇ m, Rz ⁇ 10 ⁇ m, Rz ⁇ 5 ⁇ m or even Rz ⁇ 2 ⁇ m.
  • this is advantageous because a smooth sealing surface of the piston rod complicates Farbverschleppungen in the axial direction by the piston rod guide.
  • the service life of the piston rod seal is increased by a low surface roughness.
  • the piston rod at its sealing surface has a material handling content of more than 60%, 70% or even more than 80%.
  • the piston rod on its sealing surface a wear-reducing surface coating which can for example consist of a diamond-like carbon layer, such as Dylyn ® or DLC TM (DLC: Diamond-like carbon).
  • a wear-reducing surface coating which can for example consist of a diamond-like carbon layer, such as Dylyn ® or DLC TM (DLC: Diamond-like carbon).
  • this surface coating for example, by means of a plasma-assisted chemical vapor deposition (PACVD: P lasma A ssisted C hemical V apor D eposition) are made or by a physical vapor deposition (P hysical V apor D eposition PVD).
  • P PVD plasma-assisted chemical vapor deposition
  • PVD physical vapor deposition
  • the invention is not only directed to a novel piston rod seal as a single component, but also comprises a coating agent supply device and a paint shop, which have such a piston rod seal as a component.
  • the invention also encompasses a novel method of operating such a piston rod seal, in which the insulation atomizer between the stripping piston and the piston rod seal is flushed with a rinsing agent or a coating agent to prevent coating agent residues from depositing on the lateral surface of the piston rod and then through the piston rod guide be dragged through in the axial direction.
  • This rinsing can be done regularly to avoid the disadvantages described above from the outset.
  • FIG. 1 shows an electrostatic painting plant for serial painting of motor vehicle body parts or other components, the structure and operation of this paint system in detail in the above-cited patent application DE 10 2005 048 223 A1 is described, so that the content of this patent application with regard to the structure and operation of the paint shop this description is fully attributable.
  • the paint shop has a color changer 1, a valve assembly 2, a paint reservoir 3, a further valve assembly 4, a paint dispenser 5 and a rotary atomizer 6 as an application device.
  • the paint reservoir 3 on the one hand and the paint doser 5 on the other hand can be at different electrical potentials during operation of the paint shop.
  • the paint doser 5 when applying the paint, generally has a high-voltage potential in order to achieve optimum adhesion of the applied paint to the electrically grounded motor vehicle body parts.
  • the paint reservoir 3 is generally at ground potential during operation of the paint shop, so that the paint store 3 can already be filled with a new paint during painting.
  • an insulating cylinder 7 is provided, in which a stripping piston 8 is guided axially displaceable.
  • the stripping piston 8 is moved to the position shown in the drawing to the right, wherein the stripping piston 8 scrapes paint residues from the inner wall of the insulation cylinder 7 and thereby increases the dielectric strength of the insulation cylinder 7.
  • the movement of the Abstreifkolbens 8 in the isolation cylinder 7 takes place here by a pneumatic cylinder 9, which is arranged on the opposite side of the insulating cylinder 7.
  • a pneumatic piston 10 is axially displaceable, wherein the pneumatic piston 10 is connected via a piston rod 11 with the stripping piston 8.
  • the pneumatic piston 10 can be pressurized by valves on both sides with pressure to move the pneumatic piston 10 and thus also the piston rod 11 and the stripping piston 8 in the axial direction.
  • the special feature according to the invention in this case consists in the structural design of a piston rod seal 12, which is shown in Figure 2.
  • the piston rod seal 12 has a plurality of components 13, 14, 15, 16 screwed together, which surround the piston rod 11 and receive two wet-paint seals 17, 18 and a pneumatic seal 19.
  • the two wet paint seals 17, 18 are in this case arranged on the side facing the insulating cylinder 7 and prevent lacquer from entering the pneumatic cylinder 9 or the piston rod seal 12 from the insulating cylinder 7 in the axial direction through the piston rod seal 12.
  • the pneumatic seal 19 is arranged on the pneumatic cylinder 9 facing side of the piston rod seal 12 and pressure-resistant, so that a pneumatic drive pressure in the pneumatic cylinder 9 is maintained.
  • piston rod seal 12 has a leakage space 20, which is arranged in the axial direction between the two wet paint seals 17, 18 and in the radial direction between the lateral surface of the piston rod 11 and the surrounding component 14.
  • FIG. 3 finally shows a possible embodiment of the wet paint seal 17 with two sealing edges 22, 23, whereby the service life of the wet paint seal 17 is advantageously increased.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Sealing Devices (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Reciprocating Pumps (AREA)
  • Actuator (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Fluid-Damping Devices (AREA)
  • Spray Control Apparatus (AREA)

Abstract

Various exemplary illustrations of a piston rod seal are disclosed. An exemplary piston rod seal may include a piston rod guide for guiding a piston rod that supports a scraping piston configured to scrape paint residue from an inner wall of a pipeline cylinder. The piston rod may further include a first seal for sealing the piston rod guide relative to the piston rod, and a second seal for sealing the piston rod guide relative to the piston rod, where the second seal is arranged axially offset relative to the first seal.

Description

Die Erfindung betrifft eine Kolbenstangendichtung für einen Isolationszylinder einer elektrostatischen Beschichtungsanlage und ein entsprechendes Betriebsverfahren gemäß den nebengeordneten Ansprüchen.The invention relates to a piston rod seal for an insulating cylinder of an electrostatic coating system and a corresponding operating method according to the independent claims.

Aus DE 10 2005 048 223 A1 ist eine Lackieranlage bekannt, bei der ein Lackspeicher über einen Isolationszylinder mit einem stromabwärts angeordneten Lackdosierer verbunden ist, wobei der Lackdosierer den zu applizierenden Lack gesteuert dosiert und einem Rotationszerstäuber oder einem sonstigen Applikationsgerät zuführt. Der Isolationszylinder ermöglicht hierbei eine elektrische Isolierung des Lackdosierers gegenüber dem Lackspeicher. Dies ist vorteilhaft, weil der Lackdosierer bei einem elektrostatischen Lackierverfahren in der Regel auf Hochspannungspotenzial liegt, während der von dem Lackdosierer elektrisch isolierte Lackspeicher auf Erdpotenzial liegt und deshalb während des Lackiervorgangs bereits wiederbefüllt werden kann. Zur elektrischen Isolierung werden die in dem Isolationszylinder befindlichen Lackreste von einem Abstreifkolben von der Innenwand des Isolationszylinders entfernt, um die erforderliche Durchschlagsfestigkeit herzustellen. Der Abstreifkolben ist hierbei an einem Ende einer Kolbenstange angebracht, die in einer Kolbenstangenführung verschiebbar gelagert ist und an ihrem anderen Ende einen Pneumatikkolben trägt, der in einem Pneumatikzylinder pneumatisch angetrieben werden kann, um den Abstreifkolben in dem Isolationszylinder zu verschieben.Out DE 10 2005 048 223 A1 is a painting known in which a paint memory is connected via an isolation cylinder with a downstream paint dosing, wherein the paint dosing metered metered the paint to be applied and fed to a rotary atomizer or other application device. The insulation cylinder in this case allows electrical isolation of the paint dosing relative to the paint reservoir. This is advantageous because the Lackdosierer is usually at high voltage potential in an electrostatic painting process, while the paint reservoir electrically insulated paint storage is at ground potential and therefore can be refilled during the painting process. For electrical insulation, the paint residues located in the insulation cylinder are removed by a stripping piston from the inner wall of the insulation cylinder to produce the required dielectric strength. The stripping piston is in this case attached to one end of a piston rod which is displaceably mounted in a piston rod guide and carries at its other end a pneumatic piston which can be pneumatically driven in a pneumatic cylinder to move the stripping piston in the insulating cylinder.

Problematisch an diesem bekannten Isolationszylinder ist die Tatsache, dass die Kolbenstange im Bereich zwischen dem Abstreifkolben und der Kolbenstangenführung dem zu applizierenden Lack aufgesetzt ist, so dass der an der Mantelfläche der Kolbenstange anhaftende Lack durch die Kolbenstangenführung hindurch in den Pneumatikzylinder gelangen kann, wo der Lack dann den Pneumatikzylinder verkleben und im schlimmsten Fall blockieren kann. In der Praxis kommt es im Betrieb zunächst zu einer Verlangsamung der Bewegungsgeschwindigkeit des Pneumatikzylinders und damit zu Taktzeitproblemen. Schließlich kann der Pneumatikzylinder dann vollständig blockieren, was zu einem Produktionsausfall in der Lackiererei führt. Eine besondere Gefahr geht hierbei von längeren Stillstandszeiten (z.B. nachts oder am Wochenende) aus, in denen die Bauteile durch aushärtende Farbrückstände verkleben und dann beim erneuten Produktionsanlauf versagen.The problem with this known isolation cylinder is the fact that the piston rod is placed in the region between the stripping piston and the piston rod guide the paint to be applied, so that the adhering to the lateral surface of the piston rod paint can pass through the piston rod guide into the pneumatic cylinder, where the paint then stick the pneumatic cylinder and block in the worst case. In practice, during operation, the speed of movement of the pneumatic cylinder initially slows down, resulting in cycle time problems. Finally, the pneumatic cylinder can then completely block, resulting in a production failure in the paint shop. A particular danger here is extended downtime (for example, at night or on weekends), in which the components stick together by hardening paint residue and then fail when re-starting production.

Ein weiteres Problem des vorstehend beschriebenen bekannten Isolationszylinders ist die unbefriedigende Standzeit der Kolbenstangendichtung bei einem sogenannten trockenen Betrieb der Kolbenstange, da dann geringe Lackmengen an der Kolbenstange antrocknen können, was zu einer erhöhten Abrasivität und zu einem vorzeitigem Ausfall der Kolbenstangendichtung führt.Another problem of the known isolation cylinder described above is the unsatisfactory service life of the piston rod seal in a so-called dry operation of the piston rod, since then small amounts of paint on the piston rod can dry, resulting in increased abrasiveness and premature failure of the piston rod seal.

Ferner ist zum Stand der Technik hinzuweisen auf GB 775232 , FR 2675402 (vgl. Oberbegriff der Ansprüche 1 und 13), DE 196 11 003 , DE 197 564 88 , GB 2319737 , US 5 364 035 , GB 2256679 , US 5 562 406 , US 4 863 101 A , DE 692 03 299 T2 , US 5 964 408 A , US 4 469 251 A , US 4 266 468 A , US 4 126 321 A , DE 10 2005 060 959 A1 , DE 692 28 249 T2 , DE 195 24 853 C2 und US 5 458 927 A . Keine dieser Entgegenhaltungen offenbart jedoch eine Beschichtungsmittel-Versorgungseinrichtung mit einem Isolierzylinder, bei dem eine Kolbenstangen-dichtung vorgesehen ist, die eine befriedigende Leckagesicherheit aufweist.Furthermore, it should be noted on the prior art GB 775232 . FR 2675402 (cf the preamble of claims 1 and 13), DE 196 11 003 . DE 197 564 88 . GB 2319737 . US 5,364,035 . GB 2256679 . US 5 562 406 . US Pat. No. 4,863,101A . DE 692 03 299 T2 . US 5,964,408 A . US 4,469,251 A . US 4 266 468 A . US 4,126,321 A . DE 10 2005 060 959 A1 . DE 692 28 249 T2 . DE 195 24 853 C2 and US 5,458,927 A , However, none of these references discloses a coating agent supply device having an insulating cylinder in which a piston rod seal is provided, which has a satisfactory leakage safety.

Der Erfindung liegt deshalb die Aufgabe zugrunde, den vorstehend beschriebenen bekannte Isolationszylinder entsprechend zu verbessern.The invention is therefore based on the object to improve the above-described known isolation cylinder accordingly.

Diese Aufgabe wird durch eine erfindungsgemäße Kolbenstangendichtung bzw. durch ein entsprechendes Betriebsverfahren gemäß den nebengeordneten Ansprüchen gelöst.This object is achieved by a piston rod seal according to the invention or by a corresponding operating method according to the independent claims.

Die Erfindung umfasst die allgemeine technische Lehre, dass die Kolbenstangendichtung nicht nur eine einzige Dichtung aufweist, sondern mindestens zwei Dichtungen, die in axialer Richtung versetzt angeordnet sind.The invention comprises the general technical teaching that the piston rod seal not only has a single seal, but at least two seals, which are arranged offset in the axial direction.

Zum einen bietet die zusätzliche Dichtung eine erhöhte Sicherheit, da die Dichtfunktion auch beim Ausfall einer Dichtung nicht beeinträchtigt wird.On the one hand, the additional seal offers increased safety, since the sealing function is not impaired even if a seal fails.

Zum anderen ermöglicht die erfindungsgemäße Anordnung mehrerer räumlich getrennter Dichtungen eine Fehlerüberwachung, indem der Zwischenraum zwischen den beiden Dichtungen auf eine Leckage hin überwacht wird.On the other hand, the inventive arrangement of several spatially separated seals allows error monitoring by the gap between the two seals is monitored for leakage.

Zwischen den beiden Dichtungen ist deshalb in axialer Richtung vorzugsweise ein Leckageraum angeordnet, wobei sich der Leckageraum in radialer Richtung zwischen der Kolbenstangenführung und der Mantelfläche der Kolbenstange befindet und bei einer Undichtigkeit der lackseitigen Dichtung eine Leckage des durchtretenden Lacks aufnimmt.Therefore, a leakage space is preferably arranged in the axial direction between the two seals, wherein the leakage space is located in the radial direction between the piston rod guide and the lateral surface of the piston rod and absorbs leakage of the paint passing through in case of leakage of the paint-side seal.

In einem bevorzugten Ausführungsbeispiel der Erfindung geht von dem Leckageraum eine Leckagebohrung ab, um die in den Leckageraum eintretende Leckage abzuführen.In a preferred embodiment of the invention, a leakage bore extends from the leakage space to dissipate the leakage entering the leakage space.

Darüber hinaus kann die Leckagebohrung verwendet werden, um eine Leckage zu erkennen. Hierzu kann die Leckagebohrung beispielsweise zu einem Sensor führen, wobei es sich beispielsweise um einen Drucksensor oder einen Feuchtigkeitssensor handeln kann. Falls der Leckagesensor eine Leckage erkennt, so wird die Kolbenstangendichtung bei nächster Gelegenheit ausgewechselt, was beispielsweise bei regulären Betriebsunterbrechungen in der Nacht oder am Wochenende erfolgen kann, so dass der reguläre Lackierbetrieb durch eine Leckage in der Kolbenstangendichtung nicht beeinträchtigt wird.In addition, the leakage hole can be used to detect leakage. For this purpose, the leakage bore lead, for example, to a sensor, which may be, for example, a pressure sensor or a humidity sensor. If the leak sensor detects a leak, the piston rod seal is replaced at the earliest opportunity, which may occur, for example, during normal business interruptions at night or at the weekend, so that the regular painting operation is not affected by a leakage in the piston rod seal.

Der mechanische Antrieb der Kolbenstange und damit auch des Abstreifkolbens erfolgt bei der Erfindung vorzugsweise pneumatisch, wie es bereits aus DE 10 2005 048 223 A1 bekannt ist, so dass der Inhalt dieser Patentanmeldung der vorliegenden Beschreibung in vollem Umfang zuzurechnen ist. Die Kolbenstange trägt deshalb vorzugsweise auf der dem Abstreifkolben gegenüberliegenden Seite einen Pneumatikkolben, der in einem Pneumatikzylinder verschiebbar angeordnet ist und mit Druck beaufschlagt werden kann, um den Pneumatikkolben und damit auch die Kolbenstange sowie den Abstreifkolben in axialer Richtung zu verschieben. Bei einem derartigen Antrieb der Kolbenstange durch einen Pneumatikzylinder weist die erfindungsgemäße Kolbenstangendichtung vorzugsweise eine weitere Dichtung auf, die gegenüber den beiden vorstehend erwähnten redundanten Dichtungen axial versetzt angeordnet ist und die Aufgabe hat, gegenüber dem Pneumatikzylinder abzudichten.The mechanical drive of the piston rod and thus also of the stripping piston is preferably carried out pneumatically in the invention, as it already is DE 10 2005 048 223 A1 is known, so that the content of this patent application is fully attributable to the present description. Therefore, the piston rod preferably carries on the opposite side of the stripping a pneumatic piston which is slidably disposed in a pneumatic cylinder and can be pressurized to move the pneumatic piston and thus the piston rod and the stripping piston in the axial direction. In such a drive of the piston rod by a pneumatic cylinder, the piston rod seal according to the invention preferably has a further seal, which is axially offset from the two above-mentioned redundant seals and has the task to seal against the pneumatic cylinder.

In dem bevorzugten Ausführungsbeispiel der Erfindung weist die Kolbenstangendichtung also drei Dichtungen auf, nämlich zwei Nasslackdichtungen auf der Seite des Abstreifkolbens bzw. auf der Seite des Isolationszylinders und mindestens eine Pneumatikdichtung auf der Seite des Pneumatikzylinders. Weiterhin ist es im Rahmen der Erfindung vorteilhaft, wenn die Dichtungen mehrere Dichtkanten aufweisen, wodurch die Lebensdauer der Dichtungen erhöht wird. In dem bevorzugten Ausführungsbeispiel der Erfindung weisen deshalb die Nasslackdichtungen jeweils doppelte Dichtkanten auf.In the preferred embodiment of the invention, the piston rod seal so three seals, namely two wet paint seals on the side of the Abstreifkolbens or on the side of the insulating cylinder and at least one pneumatic seal on the side of the pneumatic cylinder. Furthermore, it is advantageous in the context of the invention if the seals have a plurality of sealing edges, whereby the life of the seals is increased. In the preferred embodiment of the invention, therefore, the wet paint seals each have double sealing edges.

Ferner ist zu erwähnen, dass die Nasslackdichtungen vorzugsweise aus einem thermoplastischen Dichtungsmaterial bestehen, wie beispielsweise Polytetrafluoretylen (PTFE) oder Polyetylen (PE). Die Erfindung ist jedoch hinsichtlich des Dichtungsmaterials nicht auf die vorstehend genannten Beispiele beschränkt, sondern grundsätzlich auch mit anderen Dichtungsmaterialien realisierbar.It should also be mentioned that the wet paint seals are preferably made of a thermoplastic sealing material, such as polytetrafluoroethylene (PTFE) or polyethylene (PE). However, the invention is not limited to the above-mentioned examples in terms of the sealing material, but in principle can be realized with other sealing materials.

Hierbei können die Dichtungen optional durch eine Metallfeder unterstützt werden, um eine befriedigende Dichtwirkung zu erreichen.Here, the seals can optionally be supported by a metal spring to achieve a satisfactory sealing effect.

Weiterhin ist es vorteilhaft, wenn die Kolbenstange an ihrer Mantelfläche eine geringe Oberflächenrauhigkeit mit einer Rauhzahl Rz<20µm, Rz<10µm, Rz<5µm oder sogar Rz<2µm aufweist. Zum einen ist dies vorteilhaft, weil eine glatte Dichtfläche der Kolbenstange Farbverschleppungen in axialer Richtung durch die Kolbenstangeführung erschwert. Zum anderen wird die Standzeit der Kolbenstangendichtung durch eine geringe Oberflächenrauhigkeit erhöht.Furthermore, it is advantageous if the piston rod has a low surface roughness on its lateral surface with a roughness Rz <20 μm, Rz <10 μm, Rz <5 μm or even Rz <2 μm. On the one hand, this is advantageous because a smooth sealing surface of the piston rod complicates Farbverschleppungen in the axial direction by the piston rod guide. On the other hand, the service life of the piston rod seal is increased by a low surface roughness.

Zur Vermeidung von Farbverschleppungen in axialer Richtung ist es weiterhin vorteilhaft, wenn die Kolbenstange an ihrer Dichtfläche einen Materialtraganteil von mehr als 60%, 70% oder sogar mehr als 80% aufweist.To avoid Farbverschleppungen in the axial direction, it is also advantageous if the piston rod at its sealing surface has a material handling content of more than 60%, 70% or even more than 80%.

Dies lässt sich vorteilhaft dadurch erreichen, dass die Kolbenstange an ihrer Dichtfläche eine verschleißmindernde Oberflächenbeschichtung aufweist, die beispielsweise aus einer diamantartigen Kohlenstoffschicht bestehen kann, wie beispielsweise Dylyn® oder DLC™ (DLC: Diamond-like Carbon).This can be advantageously achieved in that the piston rod on its sealing surface a wear-reducing surface coating which can for example consist of a diamond-like carbon layer, such as Dylyn ® or DLC ™ (DLC: Diamond-like carbon).

Die Aufbringung dieser Oberflächenbeschichtung kann beispielsweise mittels eines plasma-unterstützten chemischen Dampfabscheideverfahrens (PACVD: Plasma Assisted Chemical Vapor Deposition) oder durch ein physikalisches Dampfabscheideverfahren (PVD: Physical Vapor Deposition) erfolgen.The application of this surface coating, for example, by means of a plasma-assisted chemical vapor deposition (PACVD: P lasma A ssisted C hemical V apor D eposition) are made or by a physical vapor deposition (P hysical V apor D eposition PVD).

Ferner ist zu erwähnen, dass die Erfindung nicht nur auf eine neuartige Kolbenstangendichtung als einzelnes Bauteil gerichtet ist, sondern auch eine Beschichtungsmittel-Versorgungseinrichtung und eine Lackieranlage umfasst, die eine derartige Kolbenstangendichtung als Bauteil aufweisen.It should also be mentioned that the invention is not only directed to a novel piston rod seal as a single component, but also comprises a coating agent supply device and a paint shop, which have such a piston rod seal as a component.

Schließlich umfasst die Erfindung auch ein neuartiges Betriebsverfahren für eine derartige Kolbenstangendichtung, bei dem der Isolationszerstäuber zwischen dem Abstreifkolben und der Kolbenstangendichtung mit einem Spülmittel oder einem Beschichtungsmittel gespült wird, um zu verhindern, dass sich Beschichtungsmittelreste an der Mantelfläche der Kolbenstange ablagern und dann durch die Kolbenstangenführung hindurch in axialer Richtung verschleppt werden.Finally, the invention also encompasses a novel method of operating such a piston rod seal, in which the insulation atomizer between the stripping piston and the piston rod seal is flushed with a rinsing agent or a coating agent to prevent coating agent residues from depositing on the lateral surface of the piston rod and then through the piston rod guide be dragged through in the axial direction.

Dieses Spülen kann regelmäßig erfolgen, um die eingangs beschriebenen Nachteile von vornherein zu vermeiden.This rinsing can be done regularly to avoid the disadvantages described above from the outset.

Andere vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet oder werden nachstehend zusammen mit der Beschreibung des bevorzugten Ausführungsbeispiels der Erfindung anhand der Figuren näher erläutert. Es zeigen:

Figur 1
eine erfindungsgemäße elektrostatische Lackieranlage mit einem Isolationszylinder zur elektrischen Isolie- rung eines Lackspeichers gegenüber einem stromabwärts hinter dem Lackspeicher angeordneten Lackdosierer,
Figur 2
eine Querschnittsansicht der Kolbenstangenführung bei dem Isolationszylinder aus Figur 1 sowie
Figur 3
eine vereinfachte Querschnittsansicht einer Dichtung in der Kolbenstangenführung gemäß Figur 2.
Other advantageous developments of the invention are characterized in the subclaims or are explained in more detail below together with the description of the preferred embodiment of the invention with reference to the figures. Show it:
FIG. 1
an electrostatic painting installation according to the invention with an insulation cylinder for the electrical insulation of a paint reservoir in relation to a paint dispenser arranged downstream of the paint store,
FIG. 2
a cross-sectional view of the piston rod guide in the isolation cylinder FIG. 1 such as
FIG. 3
a simplified cross-sectional view of a seal in the piston rod guide according to FIG. 2 ,

Die Zeichnung in Figur 1 zeigt eine elektrostatische Lackieranlage zur serienweisen Lackierung von Kraftfahrzeugkarosserieteilen oder sonstigen Bauteilen, wobei der Aufbau und die Funktionsweise dieser Lackieranlage detailliert in der bereits vorstehend zitierten Patentanmeldung DE 10 2005 048 223 A1 beschrieben ist, so dass der Inhalt dieser Patentanmeldung hinsichtlich des Aufbaus und der Funktionsweise der Lackieranlage dieser Beschreibung in vollem Umfang zuzurechnen ist.The drawing in FIG. 1 shows an electrostatic painting plant for serial painting of motor vehicle body parts or other components, the structure and operation of this paint system in detail in the above-cited patent application DE 10 2005 048 223 A1 is described, so that the content of this patent application with regard to the structure and operation of the paint shop this description is fully attributable.

Es ist deshalb lediglich zu erwähnen, dass die Lackieranlage einen Farbwechsler 1, eine Ventilanordnung 2, einen Lackspeicher 3, eine weitere Ventilanordnung 4, einen Lackdosierer 5 und einen Rotationszerstäuber 6 als Applikationsgerät aufweist.It is therefore only to mention that the paint shop has a color changer 1, a valve assembly 2, a paint reservoir 3, a further valve assembly 4, a paint dispenser 5 and a rotary atomizer 6 as an application device.

Der Lackspeicher 3 einerseits und der Lackdosierer 5 andererseits können hierbei im Betrieb der Lackieranlage auf unterschiedlichen elektrischen Potenzialen liegen.The paint reservoir 3 on the one hand and the paint doser 5 on the other hand can be at different electrical potentials during operation of the paint shop.

So liegt der Lackdosierer 5 beim Applizieren des Lacks in der Regel auf einem Hochspannungspotenzial, um eine optimale Anhaftung des applizierten Lacks an den elektrisch geerdeten Kraftfahrzeugkarosserieteilen zu erreichen.Thus, when applying the paint, the paint doser 5 generally has a high-voltage potential in order to achieve optimum adhesion of the applied paint to the electrically grounded motor vehicle body parts.

Der Lackspeicher 3 liegt dagegen im Betrieb der Lackieranlage in der Regel auf Massepotenzial, so dass der Lackspeicher 3 während des Lackierens bereits mit einem neuen Lack gefüllt werden kann.On the other hand, the paint reservoir 3 is generally at ground potential during operation of the paint shop, so that the paint store 3 can already be filled with a new paint during painting.

Zur elektrischen Isolation des Lackspeichers 3 gegenüber dem Lackdosierer 5 ist hierbei ein Isolationszylinder 7 vorgesehen, in dem ein Abstreifkolben 8 axial verschiebbar geführt wird. Zur elektrischen Isolierung des Isolationszylinders 7 wird der Abstreifkolben 8 in die in der Zeichnung dargestellten Stellung nach rechts bewegt, wobei der Abstreifkolben 8 Farbreste von der Innenwand des Isolationszylinders 7 abstreift und dadurch die Durchschlagsfestigkeit des Isolationszylinders 7 erhöht.For electrical insulation of the paint reservoir 3 with respect to the paint dispenser 5 in this case an insulating cylinder 7 is provided, in which a stripping piston 8 is guided axially displaceable. For electrical insulation of the insulating cylinder 7, the stripping piston 8 is moved to the position shown in the drawing to the right, wherein the stripping piston 8 scrapes paint residues from the inner wall of the insulation cylinder 7 and thereby increases the dielectric strength of the insulation cylinder 7.

Die Bewegung des Abstreifkolbens 8 in dem Isolationszylinder 7 erfolgt hierbei durch einen Pneumatikzylinder 9, der auf der dem Isolationszylinder 7 gegenüberliegenden Seite angeordnet ist. In dem Pneumatikzylinder 9 ist ein Pneumatikkolben 10 axial verschiebbar, wobei der Pneumatikkolben 10 über eine Kolbenstange 11 mit dem Abstreifkolben 8 verbunden ist. Der Pneumatikkolben 10 kann über Ventile beidseitig mit Druck beaufschlagt werden, um den Pneumatikkolben 10 und damit auch die Kolbenstange 11 und den Abstreifkolben 8 in axialer Richtung zu bewegen.The movement of the Abstreifkolbens 8 in the isolation cylinder 7 takes place here by a pneumatic cylinder 9, which is arranged on the opposite side of the insulating cylinder 7. In the pneumatic cylinder 9, a pneumatic piston 10 is axially displaceable, wherein the pneumatic piston 10 is connected via a piston rod 11 with the stripping piston 8. The pneumatic piston 10 can be pressurized by valves on both sides with pressure to move the pneumatic piston 10 and thus also the piston rod 11 and the stripping piston 8 in the axial direction.

Die erfindungsgemäße Besonderheit besteht hierbei in dem konstruktiven Aufbau einer Kolbenstangendichtung 12, die in Figur 2 dargestellt ist.The special feature according to the invention in this case consists in the structural design of a piston rod seal 12, which is shown in Figure 2.

So weist die Kolbenstangendichtung 12 mehrere miteinander verschraubte Bauteile 13, 14, 15, 16 auf, welche die Kolbenstange 11 umgeben und zwei Nasslackdichtungen 17, 18 sowie eine Pneumatikdichtung 19 aufnehmen.Thus, the piston rod seal 12 has a plurality of components 13, 14, 15, 16 screwed together, which surround the piston rod 11 and receive two wet-paint seals 17, 18 and a pneumatic seal 19.

Die beiden Nasslackdichtungen 17, 18 sind hierbei auf der dem Isolationszylinder 7 zugewandten Seite angeordnet und verhindern, dass aus dem Isolationszylinder 7 Lack in axialer Richtung durch die Kolbenstangendichtung 12 in den Pneumatikzylinder 9 oder in die Kolbenstangendichtung 12 eintritt.The two wet paint seals 17, 18 are in this case arranged on the side facing the insulating cylinder 7 and prevent lacquer from entering the pneumatic cylinder 9 or the piston rod seal 12 from the insulating cylinder 7 in the axial direction through the piston rod seal 12.

Die Pneumatikdichtung 19 ist dagegen auf der dem Pneumatikzylinder 9 zugewandten Seite der Kolbenstangendichtung 12 angeordnet und druckfest, damit ein pneumatischer Antriebsdruck in dem Pneumatikzylinder 9 aufrecht erhalten bleibt.The pneumatic seal 19, however, is arranged on the pneumatic cylinder 9 facing side of the piston rod seal 12 and pressure-resistant, so that a pneumatic drive pressure in the pneumatic cylinder 9 is maintained.

Weiterhin weist die Kolbenstangendichtung 12 einen Leckageraum 20 auf, der in axialer Richtung zwischen den beiden Nasslackdichtungen 17, 18 und in radialer Richtung zwischen der Mantelfläche der Kolbenstange 11 und dem umgebenden Bauteil 14 angeordnet ist.Furthermore, the piston rod seal 12 has a leakage space 20, which is arranged in the axial direction between the two wet paint seals 17, 18 and in the radial direction between the lateral surface of the piston rod 11 and the surrounding component 14.

Hierbei geht von dem Leckageraum 20 eine Leckagebohrung 21 ab, die nach außen geführt ist und den Anschluss eines Leckagesensors ermöglicht, der hier zur Vereinfachung nicht dargestellt ist. Bei einer Undichtigkeit der Nasslackdichtung 17 tritt dann Nasslack in den Leckageraum 20 ein, was über die Leckagebohrung 21 von dem Leckagesensor detektiert werden kann. In diesem Zustand wird die Dichtfunktion noch durch die zweite Nasslackdichtung 18 aufrecht erhalten, so dass der Betrieb der Lackieranlage nicht gestört wird. Bei der nächsten regulären Betriebsunterbrechung kann dann die Kolbenstangendichtung 12 ausgewechselt werden.In this case, from the leakage chamber 20 from a leakage hole 21 from which is guided to the outside and allows the connection of a leakage sensor, which is not shown here for simplicity. If the wet-paint gasket 17 leaks, wet paint then enters the leakage chamber 20, which can be detected by the leakage sensor via the leakage bore 21. In this state, the sealing function is still maintained by the second wet paint seal 18, so that the operation the paint shop is not disturbed. At the next regular business interruption then the piston rod seal 12 can be replaced.

Figur 3 zeigt schließlich eine mögliche Ausführungsform der Nasslackdichtung 17 mit zwei Dichtkanten 22, 23, wodurch die Standzeit der Nasslackdichtung 17 vorteilhaft erhöht wird. FIG. 3 finally shows a possible embodiment of the wet paint seal 17 with two sealing edges 22, 23, whereby the service life of the wet paint seal 17 is advantageously increased.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Farbwechslercolor changers
22
Ventilanordnungvalve assembly
33
Lackspeicherpaint storage
44
Ventilanordnungvalve assembly
55
Lackdosiererpaint dosing device
66
Rotationszerstäuberrotary atomizers
77
Isolationszylinderinsulating cylinder
88th
Abstreifkolbenscraping
99
Pneumatikzylinderpneumatic cylinder
1010
Pneumatikkolbenpneumatic piston
1111
Kolbenstangepiston rod
1212
KolbenstangendichtungPiston rod seal
13-1613-16
Bauteilecomponents
17, 1817, 18
NasslackdichtungenWet paint seals
1919
Pneumatikdichtungpneumatic seal
2020
Leckageraumleakage chamber
2121
Leckagebohrungleakage hole
22, 2322, 23
Dichtkantensealing edges

Claims (14)

  1. A piston rod seal (12) for an insulating cylinder (7) of a coating system, in particular an electrostatic coating system, comprising
    a) a piston rod guide for axially displaceable guidance of a piston rod (11), wherein the piston rod (11) supports a scraping piston (8) in order to scrape paint residues from the inner wall of the insulating cylinder (7), and
    b) a first seal (17) for sealing the piston rod guide relative to the piston rod (11),
    characterised by
    c) a second seal (18) for sealing the piston rod guide relative to the piston rod (11), wherein the second seal (18) is arranged axially offset relative to the first seal (17).
  2. The piston rod seal (12) according to claim 1, characterised by a leakage chamber (20) which is arranged in the axial direction between the first seal (17) and the second seal (18), and is arranged in the radial direction between the piston rod (11) and the piston rod guide and, in the event of a leak in the first seal (17), takes up the leakage.
  3. The piston rod seal (12) according to claim 2,
    characterised by
    a) a leakage bore (21) which extends away from the leakage chamber (20) in order to conduct the leakage away from the leakage chamber (20), and/or
    b) a leakage sensor for detecting a leak, wherein the leakage sensor is arranged in the leakage chamber or is connected to the leakage chamber via the leakage bore.
  4. The piston rod seal (12) according to one of the preceding claims, characterised by a third seal (19) for sealing the piston rod guide relative to the piston rod (11), wherein the third seal (19) is axially offset in relation to the first seal (17) and the second seal (18).
  5. The piston rod seal (12) according to one of the preceding claims, characterised in that the piston rod (11) supports the scraping piston (8) on one side and, on the other side, a pneumatic piston (10) which is displaceably guided in a pneumatic cylinder (9).
  6. The piston rod seal (12) according to claim 5,
    characterised in that
    a) the first seal (17) and the second seal (18) are wet seals and are arranged on the side of the insulating cylinder (7), and
    b) the third seal (19) is a pneumatic seal and is arranged on the side of the pneumatic cylinder (9).
  7. The piston rod seal (12) according to one of the preceding claims, characterised in that the first seal (17) and/or the second seal (18) and/or the third seal (19) comprise a plurality of sealing edges (22, 23) which seal relative to the outer surface of the piston rod (11).
  8. The piston rod seal (12) according to one of the preceding claims, characterised in that the first seal (17) and/or the second seal (18) are made from a thermoplastic sealing material, particularly polytetrafluoroethylene or polyethylene.
  9. The piston rod seal (12) according to one of the preceding claims, characterised in that the first seal (17) and/or the second seal (18) comprise a metal spring.
  10. The piston rod seal (12) according to one of the preceding claims, characterised in that
    a) the piston rod (11) has a surface roughness on the sealing surface thereof with a roughness value of Rz<20µm, Rz<10µm, Rz<5µm or Rz<2µm, and/or
    b) the piston rod (11) comprises a percentage contact area, at the sealing surface thereof, of more than 60%, 70% or 80%, and/or
    c) the piston rod (13) comprises, at the sealing surface thereof a wear-reducing surface coating.
  11. The piston rod seal (12) according to claim 10,
    characterised in that
    a) the surface coating comprises a diamond-like carbon layer, in particular Dylyn® or DLC™, and/or
    b) surface coating is applied by means of a plasma-supported chemical vapour-deposition method or with a physical vapour-deposition method.
  12. A coating supply device comprising an insulating cylinder (7) for electrical insulation of components at a different potential, characterised by a piston rod seal (12) according to one of the preceding claims.
  13. An operating method for a coating device, in particular for an electrostatic coating system, comprising an insulating cylinder (7) according to one of the preceding claims, wherein a scraping piston (8) is guided by a piston rod (11), wherein the piston rod (11) is guided in a piston rod guide with a piston rod seal (12), characterised in that the insulating cylinder (7) is rinsed, between the scraping piston (8) and the piston rod seal (12) with a rinsing agent or with a coating material.
  14. The operating method according to claim 13,
    characterised in that
    a) the rinsing is carried out regularly and/or
    b) the piston rod seal comprises at least two axially offset seals (17, 18), which enclose a leakage chamber (20), wherein the leakage chamber (20) is rinsed.
EP08749428A 2007-05-23 2008-05-09 Piston rod seal for an insulating cylinder of a coating plant Active EP2146802B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08749428T PL2146802T3 (en) 2007-05-23 2008-05-09 Piston rod seal for an insulating cylinder of a coating plant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007023931A DE102007023931A1 (en) 2007-05-23 2007-05-23 Piston rod seal for an insulation cylinder of a coating plant
PCT/EP2008/003771 WO2008141742A2 (en) 2007-05-23 2008-05-09 Piston rod seal for an insulating cylinder of a coating plant

Publications (2)

Publication Number Publication Date
EP2146802A2 EP2146802A2 (en) 2010-01-27
EP2146802B1 true EP2146802B1 (en) 2011-01-05

Family

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Application Number Title Priority Date Filing Date
EP08749428A Active EP2146802B1 (en) 2007-05-23 2008-05-09 Piston rod seal for an insulating cylinder of a coating plant

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US (1) US8387558B2 (en)
EP (1) EP2146802B1 (en)
JP (1) JP5406826B2 (en)
KR (1) KR101525605B1 (en)
CN (1) CN101678375B (en)
AT (1) ATE494072T1 (en)
BR (1) BRPI0811740B1 (en)
DE (2) DE102007023931A1 (en)
ES (1) ES2358965T3 (en)
MX (1) MX2009012530A (en)
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WO (1) WO2008141742A2 (en)

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DE102007023931A1 (en) 2008-12-04
JP2010530796A (en) 2010-09-16
ATE494072T1 (en) 2011-01-15
CN101678375B (en) 2013-05-01
WO2008141742A2 (en) 2008-11-27
DE502008002222D1 (en) 2011-02-17
ES2358965T3 (en) 2011-05-17
EP2146802A2 (en) 2010-01-27
WO2008141742A3 (en) 2009-02-05
MX2009012530A (en) 2009-12-03
KR20100023847A (en) 2010-03-04
CN101678375A (en) 2010-03-24
US20100163638A1 (en) 2010-07-01
JP5406826B2 (en) 2014-02-05
PL2146802T3 (en) 2011-06-30
US8387558B2 (en) 2013-03-05
BRPI0811740A2 (en) 2014-10-21
BRPI0811740B1 (en) 2019-09-10
KR101525605B1 (en) 2015-06-04

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