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 PDFInfo
- 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
- 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.)
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Links
- 239000011248 coating agent Substances 0.000 title claims description 14
- 238000000576 coating method Methods 0.000 title claims description 10
- 239000003973 paint Substances 0.000 claims abstract description 55
- 238000007789 sealing Methods 0.000 claims abstract description 19
- 238000007790 scraping Methods 0.000 claims abstract description 6
- 238000010292 electrical insulation Methods 0.000 claims description 5
- 238000011017 operating method Methods 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000003566 sealing material Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000009503 electrostatic coating Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000005240 physical vapour deposition Methods 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229920001169 thermoplastic Polymers 0.000 claims description 2
- 239000004416 thermosoftening plastic Substances 0.000 claims description 2
- 238000005229 chemical vapour deposition Methods 0.000 claims 1
- 238000009413 insulation Methods 0.000 description 7
- 238000002955 isolation Methods 0.000 description 7
- 238000010422 painting Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007591 painting process Methods 0.000 description 2
- 238000000623 plasma-assisted chemical vapour deposition Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- ZFXYFBGIUFBOJW-UHFFFAOYSA-N theophylline Chemical compound O=C1N(C)C(=O)N(C)C2=C1NC=N2 ZFXYFBGIUFBOJW-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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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
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
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
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
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
- 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
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
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
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
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
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
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
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
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
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
- 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)
- A piston rod seal (12) for an insulating cylinder (7) of a coating system, in particular an electrostatic coating system, comprisinga) 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), andb) a first seal (17) for sealing the piston rod guide relative to the piston rod (11),
characterised byc) 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). - 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.
- The piston rod seal (12) according to claim 2,
characterised bya) 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/orb) 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. - 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).
- 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).
- The piston rod seal (12) according to claim 5,
characterised in thata) the first seal (17) and the second seal (18) are wet seals and are arranged on the side of the insulating cylinder (7), andb) the third seal (19) is a pneumatic seal and is arranged on the side of the pneumatic cylinder (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) 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).
- 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.
- 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.
- The piston rod seal (12) according to one of the preceding claims, characterised in thata) 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/orb) the piston rod (11) comprises a percentage contact area, at the sealing surface thereof, of more than 60%, 70% or 80%, and/orc) the piston rod (13) comprises, at the sealing surface thereof a wear-reducing surface coating.
- The piston rod seal (12) according to claim 10,
characterised in thata) the surface coating comprises a diamond-like carbon layer, in particular Dylyn® or DLC™, and/orb) surface coating is applied by means of a plasma-supported chemical vapour-deposition method or with a physical vapour-deposition method. - 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.
- 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.
- The operating method according to claim 13,
characterised in thata) the rinsing is carried out regularly and/orb) 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.
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
ID=39791370
Family Applications (1)
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 |
Country Status (12)
Country | Link |
---|---|
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) |
PL (1) | PL2146802T3 (en) |
WO (1) | WO2008141742A2 (en) |
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JP5972132B2 (en) * | 2012-09-26 | 2016-08-17 | 新日鐵住金株式会社 | nozzle |
DE102014016552A1 (en) * | 2014-11-08 | 2016-05-12 | Eisenmann Se | Coating system for coating objects |
US10941762B2 (en) | 2015-01-30 | 2021-03-09 | Wagner Spray Tech Corporation | Piston limit sensing and software control for fluid application |
ES2922769T3 (en) | 2015-06-26 | 2022-09-20 | Danfoss As | hydraulic machine |
EP3109473B1 (en) | 2015-06-26 | 2021-03-10 | Danfoss A/S | Vane cell machine |
ES2731358T3 (en) | 2015-06-26 | 2019-11-15 | Danfoss As | Hydraulic machine layout |
DE102016001544A1 (en) | 2016-02-10 | 2017-08-10 | Eisenmann Se | Isolation device and coating system hereby |
EP3452228A4 (en) * | 2016-06-22 | 2020-01-01 | Wagner Spray Tech Corporation | Piston limit sensing and software control for fluid application |
US10274085B2 (en) * | 2016-06-28 | 2019-04-30 | Flowserve Management Company | Dry running end face mechanical seal |
DE102016225922A1 (en) * | 2016-12-21 | 2018-06-21 | Robert Bosch Gmbh | Piston pump, in particular high-pressure fuel pump for an internal combustion engine |
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CN107763010A (en) * | 2017-10-27 | 2018-03-06 | 三重机有限公司 | Hydraulic pressure cylinder assembly and excavator |
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-
2007
- 2007-05-23 DE DE102007023931A patent/DE102007023931A1/en not_active Withdrawn
-
2008
- 2008-05-09 JP JP2010508721A patent/JP5406826B2/en active Active
- 2008-05-09 BR BRPI0811740A patent/BRPI0811740B1/en active IP Right Grant
- 2008-05-09 EP EP08749428A patent/EP2146802B1/en active Active
- 2008-05-09 CN CN2008800169667A patent/CN101678375B/en active Active
- 2008-05-09 US US12/601,379 patent/US8387558B2/en active Active
- 2008-05-09 ES ES08749428T patent/ES2358965T3/en active Active
- 2008-05-09 PL PL08749428T patent/PL2146802T3/en unknown
- 2008-05-09 DE DE502008002222T patent/DE502008002222D1/en active Active
- 2008-05-09 KR KR1020097025375A patent/KR101525605B1/en active IP Right Grant
- 2008-05-09 MX MX2009012530A patent/MX2009012530A/en active IP Right Grant
- 2008-05-09 AT AT08749428T patent/ATE494072T1/en active
- 2008-05-09 WO PCT/EP2008/003771 patent/WO2008141742A2/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
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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