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EP1500435B1 - Method and device for the potential control of a pigged pipes arrangement - Google Patents

Method and device for the potential control of a pigged pipes arrangement Download PDF

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Publication number
EP1500435B1
EP1500435B1 EP04016358A EP04016358A EP1500435B1 EP 1500435 B1 EP1500435 B1 EP 1500435B1 EP 04016358 A EP04016358 A EP 04016358A EP 04016358 A EP04016358 A EP 04016358A EP 1500435 B1 EP1500435 B1 EP 1500435B1
Authority
EP
European Patent Office
Prior art keywords
pig
potential
station
conductive medium
high voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04016358A
Other languages
German (de)
French (fr)
Other versions
EP1500435A2 (en
EP1500435A3 (en
Inventor
Andreas Geiger
Peter Hofmann
Siegfried Poppe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duerr Systems AG
Original Assignee
Duerr Systems AG
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Filing date
Publication date
Application filed by Duerr Systems AG filed Critical Duerr Systems AG
Publication of EP1500435A2 publication Critical patent/EP1500435A2/en
Publication of EP1500435A3 publication Critical patent/EP1500435A3/en
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Publication of EP1500435B1 publication Critical patent/EP1500435B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • 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
    • B05B12/1481—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 comprising pigs, i.e. movable elements sealingly received in supply pipes, for separating different fluids, e.g. liquid coating materials from solvent or air
    • 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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/10—Arrangements for supplying power, e.g. charging power
    • 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

Definitions

  • the invention relates to a method and a device for controlling the potential of a common line arrangement according to the preamble of the independent claims.
  • the closest state of the art is e.g. from EP-A-1 270 083.
  • Molded line arrangements are known to be required in coating systems for the electrostatic serial coating of workpieces such as vehicle bodies with water-based paint or similarly conductive coating material, which is conveyed by a pig or between two pigs from a pigging station to the pig destination station through the line (EP 1 108 475, EP 1 172 152, EP 1 270 083, EP 1 314 483, etc.).
  • the promotion can take place from a pig station located on the ink supply side to ground potential to a pig station located on the high voltage potential of the electrostatic atomizer serving as the application element of the plant and also in the opposite direction when recovering non-sprayed coating material, wherein the coating material initially has the potential of Molchsendestation has and is approaching the pig destination station charged to its potential or discharged.
  • other conductive media such as rinsing liquid.
  • relatively long hoses are used as a common line, which must produce an insulating path for electrical isolation between the system components under high voltage, for example in the area of the atomizer and the ink supply located at ground potential, and consist of suitable plastics for this purpose.
  • multi-layer tubes are used, the inner layer of a for the piggability selected plastic such as PFA, while an outer or intermediate layer is made of a selected for high-voltage strength insulating material such as PE, which may be surrounded by an outer protective jacket, for example made of PUR (DE 102 39 516).
  • PE high-voltage strength insulating material
  • PE outer protective jacket
  • Pig-tubing of electrostatic coating systems should generally insulate as well as possible and therefore usually form a higher electrical resistance than the air contained in them.
  • the volume resistivity of conventional PFA pig tubes is about 10 16 ohm.m.
  • the paint column or the other conductive medium conveyed by the line forms a high electrical capacitance, typically of the order of magnitude at the usual lengths (eg up to 20 m) and inside diameters (eg 8 mm) 500 pF can lie.
  • the paint column approaches the pig target station, it is initially isolated from the target station by the air (or other insulating medium) in front of it.
  • the invention is therefore based on the object of specifying a method or a device of the type considered, the unwanted current spikes during charging or discharging the subsidized by the gemold line conductive medium and especially unwanted plant downtime without affecting the setpoint potentials and in particular the high voltage at the application organ avoids.
  • the coating material or other conductive media is brought to their potential via a high-impedance damping resistor when approaching the pig destination station before a distance from the conductive component of the pig destination station is reached, at which there is a voltage breakdown, ie sudden charging or discharging can come from the conductive medium, sparks and unwanted current peaks and thereby caused a stoppage of the coating system are reliably avoided, and there provided according to the invention damping resistance at least during the coating is not within the electrical connection of the high voltage generator with the application organ, no unwanted voltage drop can occur to the application organ. Nor is the ground potential of the supply-side pig station impaired.
  • the conductive medium is charged or discharged by a damping resistor which is connected between the potential of the respective pig target station and an electrically conductive contact point of the line contacting the conductive medium.
  • the conductive medium is charged or discharged by the lead itself forming the damping resistor.
  • this embodiment has the particular advantage that no additional components such as external damping resistors, high voltage cables and distributors are necessary. It is also beneficial that the pigs can not be affected by a separation point in the hose.
  • the damping resistor is in each case electrically connected in parallel to the formed when approaching the conductive medium to the pig station between the medium and the electrically conductive component of the pig station Isolierrange or, in other words, parallel to reaching the pig station paint or medium column and connected to it within the line.
  • a corresponding resistor arrangement is also conceivable on the supply side between the pig station and its ground potential connection.
  • the line arrangement schematically illustrated in FIG. 1 includes a first pig station 1 connected, for example, to a color change valve arrangement or possibly a metering device whose electrically conductive components are grounded to a ground terminal, a second pig station 2 connected to an electrostatic atomizer 3 and close to or can be arranged in this, and the electrically conductive components are placed by a high voltage generator 4 on the lying also on the atomizer high voltage potential, for example in the order of 100 kV. Furthermore, the line arrangement includes a connecting the two pig stations 1 and 2 hose 5 made of insulating material.
  • the tube 5 is in a known manner electrically conductive paint 6 between two pigs 7 and 8 to supply the atomizer 3 from the first pig station 1 to the second pig station 2 and possibly not recovered on recovery color material from the second pig station back to the first Sponsored pigging station.
  • the high voltage generator 4 may, depending on the nature of the system in or near the atomizer 3 or in other cases, especially in robotic systems, as shown located at a remote location.
  • the required for electrical isolation between the pig stations 1 and 2 insulating sections are also formed in a known manner by the tube 5 and preferably consisting of air insulating medium, which is located on the side facing away from the color side of the pigs in the tube 5 and also serves as a pig pushing medium ,
  • another electrically conductive medium such as, in particular, flushing liquid can be conveyed through the tube 5.
  • the color coat 6, which is initially located at the potential of the respective pig station is suddenly charged or discharged to its potential when approaching the respective pig destination station or when it falls short of an insulating distance between the paint column and the pig destination station Minimum distance to a voltage breakthrough comes through the insulating air gap.
  • each pig station 1 and 2 each provided with a passing color paint electrically contacting pad 10 and 12 and a damping resistor 13 provided between the provided at the first pig station 1 pad 10 and ground, while another damping resistor 14 between the at the second pig station 2 provided contact point 12 and connected to the high voltage generator 4 high voltage terminal of the second pig station is connected.
  • the distances between the contact points 10 and 12 of the conductive components of each adjacent pig stations 1 and 2 along the tube 5 are at least as large as the insulating distance sufficient minimum distance of the paint column of the pig station, which falls below it to the unwanted voltage breakdown, ie to sudden charging or discharging of the paint column comes, which is avoided according to the invention by the relatively slow loading or unloading via the damping resistor 14 and 13 respectively.
  • the required minimum distance is 100 kV and air as the insulating medium typically in the order of 250 - 400 mm.
  • the contact points 10 and 12 may expediently be designed as metal piggies or similarly conductive material connecting the adjoining tube sections to each other.
  • a metal fitting or a piggable connecting element formed by a substantially hollow-cylindrical metallic connecting piece with the inner diameter of the tube 5 may be used, on which, on both sides, e.g. entsrepechend the construction described in DE 103 13 063 a piece of tubing with piggable and dead space free transition placed and secured with a union nut.
  • FIG. 2 A modification of the embodiment described above is shown in Fig. 2, wherein the elements denoted by 1 to 8 coincide with those of Fig. 1. Notwithstanding Fig. 1 but only one of the contact points 10 or 12 is provided, in the illustrated example, the contact point 12 at the second pig station 2. With E and A, the required Isolierumblen are designated at the pig stations.
  • the first damping resistor 13 ' is shown connected between this contact point and a switch 20, with which it can be either grounded or connected via the second damping resistor 14' to the high voltage generator 4. Before the paint column arrives at the destination station, in this case at the pig station 2, it is in the illustrated switch position on the two resistors 13 'and 14' charged to high voltage.
  • FIG. 3 The embodiment also shown schematically in Fig. 3 corresponds to that of Fig. 1 with respect to the grounded pig station 1 ', the high voltage potential from the high voltage generator 4' high voltage potential and connected to the atomizer 3 'pig station 2' and connecting the two pig stations together and from each other insulating tube 5 ', through which the paint column 6' is conveyed between the pigs 7 'and 8', so that in this respect no further explanation is required.
  • the attenuation according to the invention of charging or discharging the paint column 6 'as it approaches the pig station 1' or 2 'serving as the destination station is not effected by damping resistors connected externally to the line as in FIG.
  • the line forming the line Hose 5 'itself which is electrically weakly conductive for this purpose.
  • the electrical resistance of the tube 5 ' is at least at its end portions dimensioned so that it serves as an insulating path for electrical isolation between the two pig stations 1' and 2 ', on the other hand, the paint column 6' in their approach to the pig destination station charging or discharging their potential before a voltage breakdown occurs.
  • the charging or discharging according to the invention takes place through the hose, while the color column 6 'extends through the Insulating distances A and E corresponding charging or discharging paths to the respective pig destination station moves.
  • the attenuation resistors formed mainly by the ends of the hose 5 'adjoining the pig stations are thus also connected electrically outside the electrical connection of the high voltage generator 4' to the atomizer 3 'in parallel to the insulating path between the paint column and the electrically conductive component of the pig station.
  • the tube 5 ' as the tube 5 of the embodiment of FIG. 1 expediently have the multi-layer structure described in the introduction according to DE 102 39 516, where the mechanical and other requirements for piggable hoses explained there should be met.
  • the hose is preferably transparent.
  • at least the inner surface of the hose contacting the conveyed medium is conductive for defining the desired electrical resistance. Suitable ways of forming the resistor are e.g.
  • Fig. 4 The above-mentioned further possibility of switching on damping resistors between the pig stations and their potential connection is shown in Fig. 4, in which the Elements 1 to 8 correspond to the embodiment of FIG. 1.
  • the resistor arrangement is formed here by the parallel connection of the external damping resistor 24 with a controlled switch 25.
  • the damping resistor is activated in this embodiment by opening the switch 24 only during the time in which it is needed, so when approaching the conductive medium to the pig destination station. In the remaining time, the damping resistor is bridged by the switch 25, so that the high voltage generator 4 is connected directly to the pig station 2 and the atomizer 3, as in the other embodiments, especially in the coating.
  • the switch 25 can be automatically switched e.g. be controlled by signals from sensors (not shown) which monitor and report in a conventional manner the positions of the paint column or the other conveyed between the pig conductive medium.

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Semiconductor Integrated Circuits (AREA)
  • Coating Apparatus (AREA)

Abstract

Process for controlling the potential of a piggable pipeline arrangement in which in a system for electrostatic series coating of workpieces an electrically conductive coating material or another conductive medium (6) is conveyed between two pig stations (1, 2) using at least one pig (7, 8) comprises bringing the conductive medium conveyed through the pipeline (5) to the potential of the pig target station on nearing the target station via an electrical resistor (13, 14) which, at least during the coating of the workpieces, lies outside the electrical connection of a high voltage generator (4) to an application element (3). Independent claims are also included for: (1) Device for controlling the potential of a piggable pipeline arrangement in a system for electrostatic series coating of workpieces; and (2) Piggable tube for the above device.

Description

Die Erfindung betrifft ein Verfahren und eine Einrichtung zur Potenzialsteuerung einer gemolchten Leitungsanordnung gemäß dem Oberbegriff der unabhängigen Patentansprüche. Der nächstkommende stand der Technik ist z.B. aus der EP-A-1 270 083 bekannt.The invention relates to a method and a device for controlling the potential of a common line arrangement according to the preamble of the independent claims. The closest state of the art is e.g. from EP-A-1 270 083.

Gemolchte Leitungsanordnungen benötigt man bekanntlich in Beschichtungsanlagen für die elektrostatische Serienbeschichtung von Werkstücken wie z.B. Fahrzeugkarossen mit Wasserlack oder ähnlich leitfähigem Beschichtungsmaterial, das von einem Molch oder zwischen zwei Molchen von einer Molchsendestation zu der Molchzielstation durch die Leitung gefördert wird (EP 1 108 475, EP 1 172 152, EP 1 270 083, EP 1 314 483 usw.). Die Förderung kann von einer auf der Farbversorgungsseite auf Erdpotenzial liegenden Molchstation zu einer auf dem Hochspannungspotenzial des als Applikationsorgan der Anlage dienenden elektrostatischen Zerstäubers liegenden Molchstation und bei der Rückgewinnung von nicht versprühtem Beschichtungsmaterial auch in der entgegengesetzten Richtung erfolgen, wobei das Beschichtungsmaterial jeweils zunächst das Potenzial der Molchsendestation hat und bei Annäherung an die Molchzielstation auf deren Potenzial aufgeladen bzw. entladen wird. Entsprechendes gilt für die Förderung anderer leitfähiger Medien wie z.B. Spülflüssigkeit. Als gemolchte Leitung dienen in der Regel relativ lange Schläuche, die eine Isolierstrecke zur Potenzialtrennung zwischen den unter Hochspannung stehenden Anlagenteilen beispielsweise im Bereich des Zerstäubers und der auf Erdpotenzial befindlichen Farbversorgung herstellen müssen und aus hierfür geeigneten Kunststoffen bestehen. Vorzugsweise werden mehrlagige Schläuche verwendet, deren Innenschicht aus einem für die Molchbarkeit gewählten Kunststoff wie beispielsweise PFA besteht, während eine Außen- oder Zwischenschicht aus einem für Hochspannungsfestigkeit gewählten Isolationswerkstoff wie beispielsweise PE hergestellt wird, die von einem äußeren Schutzmantel beispielsweise aus PUR umgeben sein kann (DE 102 39 516). Molchschläuche elektrostatischer Beschichtungsanlagen sollen generell möglichst gut isolieren und bilden deshalb üblicherweise einen höheren elektrischen Widerstand als die in ihnen enthaltene Luft. Beispielsweise beträgt der spezifische Durchgangswiderstand üblicher Molchschläuche aus PFA etwa 1016 Ohm.m.Molded line arrangements are known to be required in coating systems for the electrostatic serial coating of workpieces such as vehicle bodies with water-based paint or similarly conductive coating material, which is conveyed by a pig or between two pigs from a pigging station to the pig destination station through the line (EP 1 108 475, EP 1 172 152, EP 1 270 083, EP 1 314 483, etc.). The promotion can take place from a pig station located on the ink supply side to ground potential to a pig station located on the high voltage potential of the electrostatic atomizer serving as the application element of the plant and also in the opposite direction when recovering non-sprayed coating material, wherein the coating material initially has the potential of Molchsendestation has and is approaching the pig destination station charged to its potential or discharged. The same applies to the promotion of other conductive media such as rinsing liquid. Generally, relatively long hoses are used as a common line, which must produce an insulating path for electrical isolation between the system components under high voltage, for example in the area of the atomizer and the ink supply located at ground potential, and consist of suitable plastics for this purpose. Preferably, multi-layer tubes are used, the inner layer of a for the piggability selected plastic such as PFA, while an outer or intermediate layer is made of a selected for high-voltage strength insulating material such as PE, which may be surrounded by an outer protective jacket, for example made of PUR (DE 102 39 516). Pig-tubing of electrostatic coating systems should generally insulate as well as possible and therefore usually form a higher electrical resistance than the air contained in them. For example, the volume resistivity of conventional PFA pig tubes is about 10 16 ohm.m.

Bei den hier betrachteten Leitungsanordnungen besteht das Problem, dass die durch die Leitung geförderte Lacksäule oder das sonstige leitende Medium eine hohe elektrische Kapazität bildet, die bei den üblichen Längen (z.B. bis 20 m) und Innendurchmessern (z.B. 8 mm) typisch in der Größenordnung von 500 pF liegen kann. Wenn die Lacksäule sich der Molchzielstation nähert, ist sie zunächst durch die vor ihr befindliche Luft (oder ein anderes Isoliermedium) von der Zielstation isoliert. Sobald aber ein als Isolierstrecke ausreichender Mindestabstand zwischen der Lacksäule und der Zielstation unterschritten wird und die durch die Lacksäule gebildete Kapazität vor oder in der Zielstation schlagartig je nach der Förderrichtung auf das Hochspannungspotenzial aufgeladen oder auf Erdpotenzial entladen wird, entstehen hohe Stromspitzen, die zu ungewolltem Abschalten der Hochspannung durch das Überwachungs- und Steuersystem der Anlage führen, weil sie als Störung gewertet werden. Außerdem können bei der Umladung entstehende Funken Schäden zur Folge haben oder aus Sicherheitsgründen unzulässig sein.In the case of the line arrangements considered here, there is the problem that the paint column or the other conductive medium conveyed by the line forms a high electrical capacitance, typically of the order of magnitude at the usual lengths (eg up to 20 m) and inside diameters (eg 8 mm) 500 pF can lie. As the paint column approaches the pig target station, it is initially isolated from the target station by the air (or other insulating medium) in front of it. However, as soon as a sufficient distance between the paint column and the destination station is minimized and the capacitance formed by the paint column is suddenly charged to the high-voltage potential or discharged to ground potential before or in the target station, high current peaks occur, which lead to unintentional turn-off high voltage through the monitoring and control system of the plant, because they are considered as a fault. In addition, sparks resulting from transhipment may cause damage or be inadmissible for safety reasons.

Zur Lösung dieses Problems besteht an sich die Möglichkeit, auf der Versorgungsseite einen Dämpfungswiderstand zwischen die geerdete Molchstation und deren Masseanschluss zu schalten, während auf der Hochspannungsseite ein Dämpfungswiderstand in die Verbindung des Hochspannungserzeugers mit dem Applikationsorgan geschaltet werden kann. Der Spannungsabfall an dem Dämpfungswiderstand der Hochspannungsseite hat aber den wesentlichen Nachteil, dass er die elektrostatische Aufladung des Beschichtungsmaterials beeinträchtigt. Außerdem kann es für die Steuerung der Beschichtungsanlage wichtig sein, dass die definierte Spannung des Hochspannungserzeugers möglichst genau auch am Zerstäuber vorhanden ist, während festes Erdpotenzial an der Molchstation der Versorgungsseite aus Sicherheitsgründen notwendig sein kann.As a solution to this problem, it is possible to have a damping resistor on the supply side to switch the grounded pig station and its ground terminal, while on the high voltage side, a damping resistor can be connected in the connection of the high voltage generator with the application organ. However, the voltage drop across the damping resistor of the high voltage side has the significant disadvantage that it affects the electrostatic charge of the coating material. In addition, it may be important for the control of the coating system that the defined voltage of the high voltage generator is as accurate as possible also on the atomizer, while fixed earth potential at the pig station of the supply side may be necessary for safety reasons.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren bzw. eine Einrichtung der betrachteten Gattung anzugeben, die unerwünschte Stromspitzen beim Auf- oder Entladen des durch die gemolchte Leitung geförderten leitfähigen Mediums und vor allem ungewollten Anlagenstillstand ohne Beeinträchtigung der Sollpotenziale und insbesondere der Hochspannung am Applikationsorgan vermeidet.The invention is therefore based on the object of specifying a method or a device of the type considered, the unwanted current spikes during charging or discharging the subsidized by the gemold line conductive medium and especially unwanted plant downtime without affecting the setpoint potentials and in particular the high voltage at the application organ avoids.

Diese Aufgabe wird durch die Merkmale der Patentansprüche gelöst.This object is solved by the features of the claims.

Da erfindungsgemäß das Beschichtungsmaterial oder sonstige leitfähige Medien bei der Annäherung an die Molchzielstation über einen hochohmigen Dämpfungswiderstand auf deren Potenzial gelegt wird, bevor ein Abstand von dem leitenden Bestandteil der Molchzielstation erreicht wird, bei dem es zu einem Spannungsdurchbruch, d.h. zu schlagartiger Auf- oder Entladung des leitfähigen Mediums kommen kann, werden Funken und unerwünschte Stromspitzen und ein dadurch verursachter Stillstand der Beschichtungsanlage zuverlässig vermieden, und da der erfindungsgemäß vorgesehene Dämpfungswiderstand zumindest während der Beschichtung nicht innerhalb der elektrischen Verbindung des Hochspannungserzeugers mit dem Applikationsorgan liegt, kann auch kein unerwünschter Spannungsabfall zum Applikationsorgan auftreten. Ebenso wenig wird das Erdpotenzial der versorgungsseitigen Molchstation beeinträchtigt.Since, according to the invention, the coating material or other conductive media is brought to their potential via a high-impedance damping resistor when approaching the pig destination station before a distance from the conductive component of the pig destination station is reached, at which there is a voltage breakdown, ie sudden charging or discharging can come from the conductive medium, sparks and unwanted current peaks and thereby caused a stoppage of the coating system are reliably avoided, and there provided according to the invention damping resistance at least during the coating is not within the electrical connection of the high voltage generator with the application organ, no unwanted voltage drop can occur to the application organ. Nor is the ground potential of the supply-side pig station impaired.

Gemäß einem ersten Ausführungsbeispiel der Erfindung wird das leitfähige Medium von einem Dämpfungswiderstand aufgeladen oder entladen, der zwischen das Potenzial der jeweiligen Molchzielstation und eine das leitfähige Medium kontaktierende elektrisch leitende Kontaktstelle der Leitung geschaltet ist.According to a first embodiment of the invention, the conductive medium is charged or discharged by a damping resistor which is connected between the potential of the respective pig target station and an electrically conductive contact point of the line contacting the conductive medium.

Gemäß einem zweiten Ausführungsbeispiel der Erfindung wird das leitfähige Medium dagegen von der selbst den Dämpfungswiderstand bildenden Leitung aufgeladen oder entladen. Dieses Ausführungsbeispiel hat also den besonderen Vorteil, dass keine zusätzlichen Bauteile wie externe Dämpfungswiderstände, Hochspannungskabel und Verteiler notwendig sind. Günstig ist auch, dass die Molche nicht durch eine Trennstelle im Schlauch beeinträchtigt werden können.On the other hand, according to a second embodiment of the invention, the conductive medium is charged or discharged by the lead itself forming the damping resistor. Thus, this embodiment has the particular advantage that no additional components such as external damping resistors, high voltage cables and distributors are necessary. It is also beneficial that the pigs can not be affected by a separation point in the hose.

Bei diesen beiden Ausführungsbeispielen ist der Dämpfungswiderstand jeweils elektrisch parallel zu der bei Annäherung des leitfähigen Mediums an die Molchstation zwischen dem Medium und dem elektrisch leitenden Bestandteil der Molchstation gebildeten Isolierstrecke oder, mit anderen Worten, parallel zu der die Molchstation erreichenden Lack- oder Mediumsäule geschaltet und innerhalb der Leitung an diese angeschlossen. Gemäß einem weiteren Ausführungsbeispiel besteht aber auch die Möglichkeit, das leitfähige Medium über einen Dämpfungswiderstand aufzuladen, der bei Annäherung des Mediums an die Molchzielstation in die elektrische Verbindung des Hochspannungserzeugers mit dem Applikationsorgan geschaltet und während der Beschichtung elektrisch leitend überbrückt wird. Eine entsprechende Widerstandsanordnung ist auch auf der Versorgungsseite zwischen der Molchstation und deren Erdpotenzialanschluss denkbar.In these two embodiments, the damping resistor is in each case electrically connected in parallel to the formed when approaching the conductive medium to the pig station between the medium and the electrically conductive component of the pig station Isolierstrecke or, in other words, parallel to reaching the pig station paint or medium column and connected to it within the line. According to a further embodiment, however, it is also possible to charge the conductive medium via a damping resistor which, when the medium approaches the pig destination station, switches into the electrical connection of the high voltage generator to the application organ and is bridged during the coating electrically conductive. A corresponding resistor arrangement is also conceivable on the supply side between the pig station and its ground potential connection.

An den in der Zeichnung dargestellten Ausführungsbeispielen wird die Erfindung näher erläutert. Es zeigen

Fig. 1
eine gemolchte Leitungsanordnung mit externen Dämpfungswiderständen;
Fig. 2
eine Abwandlung des Ausführungsbeispiels nach Fig. 1;
Fig. 3
eine Leitungsanordnung, in der die Leitung selbst als Dämpfungswiderstand dient; und
Fig. 4
ein weiteres Ausführungsbeispiel.
In the embodiments illustrated in the drawings, the invention is explained in detail. Show it
Fig. 1
a battered line arrangement with external damping resistors;
Fig. 2
a modification of the embodiment of FIG. 1;
Fig. 3
a line arrangement in which the line itself serves as a damping resistor; and
Fig. 4
another embodiment.

Die in Fig. 1 schematisch dargestellte Leitungsanordnung enthält eine z.B. mit einer Farbwechselventilanordnung oder ggf. einer Dosiereinrichtung verbundene erste Molchstation 1, deren elektrisch leitfähige Bestandteile an einem Masseanschluss geerdet sind, eine zweite Molchstation 2, die mit einem elektrostatischen Zerstäuber 3 verbunden ist und nahe bei oder in diesem angeordnet sein kann, und deren elektrisch leitfähige Bestandteile von einem Hochspannungserzeuger 4 auf das auch an dem Zerstäuber liegende Hochspannungspotenzial z.B. in der Größenordnung von 100 kV gelegt werden. Ferner enthält die Leitungsanordnung einen die beiden Molchstationen 1 und 2 verbindenden Schlauch 5 aus Isolierwerkstoff. Durch den Schlauch 5 wird in bekannter Weise elektrisch leitender Farblack 6 zwischen zwei Molchen 7 und 8 zur Versorgung des Zerstäubers 3 von der ersten Molchstation 1 zu der zweiten Molchstation 2 und ggf. bei Rückgewinnung nicht versprühten Farbmaterials von der zweiten Molchstation wieder zurück zu der ersten Molchstation gefördert. Der Hochspannungserzeuger 4 kann sich je nach Art der Anlage in oder nahe am Zerstäuber 3 oder in anderen Fällen, insbesondere bei Roboteranlagen, darstellungsgemäß an einer entfernten Stelle befinden.The line arrangement schematically illustrated in FIG. 1 includes a first pig station 1 connected, for example, to a color change valve arrangement or possibly a metering device whose electrically conductive components are grounded to a ground terminal, a second pig station 2 connected to an electrostatic atomizer 3 and close to or can be arranged in this, and the electrically conductive components are placed by a high voltage generator 4 on the lying also on the atomizer high voltage potential, for example in the order of 100 kV. Furthermore, the line arrangement includes a connecting the two pig stations 1 and 2 hose 5 made of insulating material. Through the tube 5 is in a known manner electrically conductive paint 6 between two pigs 7 and 8 to supply the atomizer 3 from the first pig station 1 to the second pig station 2 and possibly not recovered on recovery color material from the second pig station back to the first Sponsored pigging station. The high voltage generator 4 may, depending on the nature of the system in or near the atomizer 3 or in other cases, especially in robotic systems, as shown located at a remote location.

Die zur Potenzialtrennung zwischen den beiden Molchstationen 1 und 2 erforderlichen Isolierstrecken werden in ebenfalls bekannter Weise durch den Schlauch 5 und das vorzugsweise aus Luft bestehende Isoliermedium gebildet, das sich auf den dem Farblack abgewandten Seiten der Molche in dem Schlauch 5 befindet und auch als Molchschiebemedium dient. Statt Farblack kann auch ein anderes elektrisch leitendes Medium wie insbesondere Spülflüssigkeit durch den Schlauch 5 gefördert werden.The required for electrical isolation between the pig stations 1 and 2 insulating sections are also formed in a known manner by the tube 5 and preferably consisting of air insulating medium, which is located on the side facing away from the color side of the pigs in the tube 5 and also serves as a pig pushing medium , Instead of colored lacquer, another electrically conductive medium such as, in particular, flushing liquid can be conveyed through the tube 5.

Erfindungsgemäß soll vermieden werden, dass der zunächst auf dem Potenzial der jeweiligen Molchsendestation befindliche Farblack 6 bei Annäherung an die jeweilige Molchzielstation oder in ihr schlagartig auf deren Potenzial aufgeladen bzw. entladen wird, wenn es bei Unterschreiten eines als Isolierstrecke zwischen der Lacksäule und der Molchzielstation ausreichenden Mindestabstands zu einem Spannungsdurchbruch durch die isolierende Luftstrecke kommt. Zu diesem Zweck ist in der Nähe jeder Molchstation 1 und 2 je eine den vorbeifließenden Farblack elektrisch kontaktierende Kontaktstelle 10 bzw. 12 vorgesehen und ein Dämpfungswiderstand 13 zwischen die an der ersten Molchstation 1 vorgesehene Kontaktstelle 10 und Masse geschaltet, während ein weiterer Dämpfungswiderstand 14 zwischen die an der zweiten Molchstation 2 vorgesehene Kontaktstelle 12 und einen mit dem Hochspannungserzeuger 4 verbundenen Hochspannungsanschluss der zweiten Molchstation geschaltet ist. Die Abstände der Kontaktstellen 10 und 12 von den leitenden Bestandteilen der jeweils benachbarten Molchstationen 1 bzw. 2 längs des Schlauches 5 sind mindestens so groß wie der als Isolierstrecke ausreichende Mindestabstand der Lacksäule von der Molchstation, bei deren Unterschreiten es zu dem unerwünschten Spannungsdurchbruch, d.h. zu schlagartiger Auf- oder Entladung der Lacksäule kommt, die erfindungsgemäß durch die relativ langsame Auf- bzw. Entladung über den Dämpfungswiderstand 14 bzw. 13 vermieden wird. Der erforderliche Mindestabstand liegt bei 100 kV und Luft als Isoliermedium typisch in der Größenordnung von 250 - 400 mm.According to the invention, it is to be avoided that the color coat 6, which is initially located at the potential of the respective pig station, is suddenly charged or discharged to its potential when approaching the respective pig destination station or when it falls short of an insulating distance between the paint column and the pig destination station Minimum distance to a voltage breakthrough comes through the insulating air gap. For this purpose, in the vicinity of each pig station 1 and 2 each provided with a passing color paint electrically contacting pad 10 and 12 and a damping resistor 13 provided between the provided at the first pig station 1 pad 10 and ground, while another damping resistor 14 between the at the second pig station 2 provided contact point 12 and connected to the high voltage generator 4 high voltage terminal of the second pig station is connected. The distances between the contact points 10 and 12 of the conductive components of each adjacent pig stations 1 and 2 along the tube 5 are at least as large as the insulating distance sufficient minimum distance of the paint column of the pig station, which falls below it to the unwanted voltage breakdown, ie to sudden charging or discharging of the paint column comes, which is avoided according to the invention by the relatively slow loading or unloading via the damping resistor 14 and 13 respectively. The required minimum distance is 100 kV and air as the insulating medium typically in the order of 250 - 400 mm.

Die Kontaktstellen 10 und 12 können zweckmäßig als die jeweils angrenzenden Schlauchabschnitte miteinander verbindende molchbare Leitungselemente aus Metall oder ähnlich leitfähigem Werkstoff ausgebildet sein. Beispielsweise kann eine Metallverschraubung oder ein molchbares Verbindungselement verwendet werden, das durch einen im Wesentlichen hohlzylindrischen metallischen Anschlussstutzen mit dem Innendurchmesser des Schlauches 5 gebildet ist, an dem auf beiden Seiten z.B. entsrepechend der in der DE 103 13 063 beschriebenen Konstruktion ein Schlauchstück mit molchbarem und totraumfreiem Übergang aufgesetzt und mit einer Überwurfmutter befestigt ist.The contact points 10 and 12 may expediently be designed as metal piggies or similarly conductive material connecting the adjoining tube sections to each other. For example, a metal fitting or a piggable connecting element formed by a substantially hollow-cylindrical metallic connecting piece with the inner diameter of the tube 5 may be used, on which, on both sides, e.g. entsrepechend the construction described in DE 103 13 063 a piece of tubing with piggable and dead space free transition placed and secured with a union nut.

Eine Abwandlung des oben beschriebenen Ausführungsbeispiels ist in Fig. 2 dargestellt, wobei die mit 1 bis 8 bezeichneten Elemente mit denen aus Fig. 1 übereinstimmen. Abweichend von Fig. 1 ist aber nur eine der Kontaktstellen 10 oder 12 vorgesehen, bei dem dargestellten Beispiel die Kontaktstelle 12 bei der zweiten Molchstation 2. Mit E und A sind die erforderlichen Isolierstrecken an den Molchstationen bezeichnet. Der erste Dämpfungswiderstand 13' ist darstellungsgemäß zwischen diese Kontaktstelle und einen Schalter 20 geschaltet, mit dem er wahlweise an Masse gelegt oder über den zweiten Dämpfungswiderstand 14' mit dem Hochspannungserzeuger 4 verbunden werden kann. Bevor die Lacksäule an der Zielstation eintrifft, hier also an der Molchstation 2, wird sie bei der dargestellten Schalterstellung über die beiden Widerstände 13' und 14' auf Hochspannung aufgeladen. Beim Zurückdrücken der Lacksäule zu der ersten Molchstation 1 wird dagegen nach Ausbildung der erforderlichen Isolierstrecke A auf der der Molchstation 2 zugewandten Seite der Lacksäule der Schalter 20 in die Stellung umgelegt, in der er die Kontaktstelle 12 über den Widerstand 13' erdet, so dass die zuvor aufgeladene Lacksäule über den Widerstand 13' entladen wird. Gegenüber Fig. 1 besteht der Vorteil, dass die Schlauchkontaktierung nur an einer Stelle erforderlich ist.A modification of the embodiment described above is shown in Fig. 2, wherein the elements denoted by 1 to 8 coincide with those of Fig. 1. Notwithstanding Fig. 1 but only one of the contact points 10 or 12 is provided, in the illustrated example, the contact point 12 at the second pig station 2. With E and A, the required Isolierstrecken are designated at the pig stations. The first damping resistor 13 'is shown connected between this contact point and a switch 20, with which it can be either grounded or connected via the second damping resistor 14' to the high voltage generator 4. Before the paint column arrives at the destination station, in this case at the pig station 2, it is in the illustrated switch position on the two resistors 13 'and 14' charged to high voltage. When pushing back the paint column to the first pig station 1, however, after forming the required insulating distance A on the pig station 2 side facing the paint column of the switch 20 is placed in the position in which he grounded the pad 12 via the resistor 13 ', so that the previously charged paint column via the resistor 13 'is discharged. Compared with Fig. 1, there is the advantage that the hose contacting is required only at one point.

Das in Fig. 3 ebenfalls schematisch dargestellte Ausführungsbeispiel entspricht dem nach Fig. 1 hinsichtlich der geerdeten Molchstation 1', der von dem Hochspannungserzeuger 4' auf Hochspannungspotenzial gelegten und mit dem Zerstäuber 3' verbundenen Molchstation 2' und des die beiden Molchstationen miteinander verbindenden und voneinander isolierenden Schlauches 5', durch den die Lacksäule 6' zwischen den Molchen 7' und 8' gefördert wird, so dass insoweit keine weitere Erläuterung erforderlich ist. Die erfindungsgemäße Dämpfung der Auf- bzw. Entladung der Lacksäule 6' bei Annäherung an die jeweils als Zielstation dienende Molchstation 1' oder 2' erfolgt hier aber nicht durch extern an die Leitung angeschlossene Dämpfungswiderstände wie in Fig. 1, sondern durch den die Leitung bildenden Schlauch 5' selbst, der zu diesem Zweck elektrisch schwach leitfähig ist. Damit ist gemeint, dass der elektrische Widerstand des Schlauches 5' zumindest an dessen Endteilen so bemessen ist, dass er einerseits als Isolierstrecke zur Potenzialtrennung zwischen den beiden Molchstationen 1' und 2' dient, andererseits aber die Lacksäule 6' bei deren Annäherung an die Molchzielstation auf deren Potenzial auflädt oder entlädt, bevor ein Spannungsdurchbruch auftritt.The embodiment also shown schematically in Fig. 3 corresponds to that of Fig. 1 with respect to the grounded pig station 1 ', the high voltage potential from the high voltage generator 4' high voltage potential and connected to the atomizer 3 'pig station 2' and connecting the two pig stations together and from each other insulating tube 5 ', through which the paint column 6' is conveyed between the pigs 7 'and 8', so that in this respect no further explanation is required. The attenuation according to the invention of charging or discharging the paint column 6 'as it approaches the pig station 1' or 2 'serving as the destination station is not effected by damping resistors connected externally to the line as in FIG. 1, but by the line forming the line Hose 5 'itself, which is electrically weakly conductive for this purpose. By this is meant that the electrical resistance of the tube 5 'is at least at its end portions dimensioned so that it serves as an insulating path for electrical isolation between the two pig stations 1' and 2 ', on the other hand, the paint column 6' in their approach to the pig destination station charging or discharging their potential before a voltage breakdown occurs.

Die erfindungsgemäße Aufladung bzw. Entladung durch den Schlauch erfolgt, während die Farbsäule 6' sich durch die den Isolierstrecken A und E entsprechenden Auflade- bzw. Entladestrecken zu der jeweiligen Molchzielstation bewegt. Die hauptsächlich von den an die Molchstationen angrenzenden Enden des Schlauches 5' gebildeten Dämpfungswiderstände sind also auch hier außerhalb der elektrischen Verbindung des Hochspannungserzeugers 4' mit dem Zerstäuber 3' elektrisch parallel zu der Isolierstrecke zwischen der Lacksäule und dem elektrisch leitenden Bestandteil der Molchstation geschaltet.The charging or discharging according to the invention takes place through the hose, while the color column 6 'extends through the Insulating distances A and E corresponding charging or discharging paths to the respective pig destination station moves. The attenuation resistors formed mainly by the ends of the hose 5 'adjoining the pig stations are thus also connected electrically outside the electrical connection of the high voltage generator 4' to the atomizer 3 'in parallel to the insulating path between the paint column and the electrically conductive component of the pig station.

Der Schlauch 5' kann wie der Schlauch 5 des Ausführungsbeispiels nach Fig. 1 zweckmäßig den eingangs beschriebenen mehrlagigen Aufbau entsprechend der DE 102 39 516 haben, wobei die dort erläuterten mechanischen und sonstigen Anforderungen an molchbare Schläuche erfüllt sein sollen. Zur Beobachtung der Molche und/oder der Lacksäule während des Betriebes ist der Schlauch vorzugsweise transparent. Im Gegensatz zu den bisher üblichen Molchschläuchen, die möglichst vollkommen isolierend sein sollten, ist aber erfindungsgemäß mindestens die das geförderte Medium kontaktierende Innenfläche des Schlauches zur Definition des gewünschten elektrischen Widerstands leitend. Zweckmäßige Möglichkeiten zur Bildung des Widerstandes bestehen z.B. darin, in das Kunststoffmaterial der innersten Lage des Schlauches elektrisch leitende Partikel einzubetten oder an der Innenseite des Schlauches Fäden aus Widerstandsmaterial anzuordnen oder Spuren aus im gewünschten Maß leitfähig gemachtem Kunststoff zu bilden, was beispielsweise beim Extrudieren des Schlauches erfolgen kann. Besonders die letztgenannten Möglichkeiten haben den Vorteil, dass sie die gewünschte Transparenz des Schlauches nicht beeinträchtigen.The tube 5 ', as the tube 5 of the embodiment of FIG. 1 expediently have the multi-layer structure described in the introduction according to DE 102 39 516, where the mechanical and other requirements for piggable hoses explained there should be met. For observing the pigs and / or the paint column during operation, the hose is preferably transparent. In contrast to the hitherto conventional pig hoses, which should be as completely as possible insulating, according to the invention, at least the inner surface of the hose contacting the conveyed medium is conductive for defining the desired electrical resistance. Suitable ways of forming the resistor are e.g. It is to embed in the plastic material of the innermost layer of the tube electrically conductive particles or to arrange on the inside of the tube threads of resistance material or to form tracks made conductive plastic to the desired extent, which can be done for example when extruding the tube. Especially the latter possibilities have the advantage that they do not affect the desired transparency of the tube.

Die eingangs erwähnte weitere Möglichkeit der Einschaltung von Dämpfungswiderständen zwischen die Molchstationen und deren Potenzialanschluss ist in Fig. 4 dargestellt, in der die Elemente 1 bis 8 dem Ausführungsbeispiel nach Fig. 1 entsprechen. Die Widerstandsanordnung ist hier durch die Parallelschaltung des externen Dämpfungswiderstands 24 mit einem gesteuerten Schalter 25 gebildet. Der Dämpfungswiderstand wird bei diesem Ausführungsbeispiel durch Öffnen des Schalters 24 nur während der Zeit aktiviert, in der er benötigt wird, also bei Annäherung des leitfähigen Mediums an die Molchzielstation. In der übrigen Zeit wird der Dämpfungswiderstand durch den Schalter 25 überbrückt, so dass der Hochspannungserzeuger 4 wie bei den anderen Ausführungsbeispielen vor allem bei der Beschichtung direkt mit der Molchstation 2 und dem Zerstäuber 3 verbunden ist.The above-mentioned further possibility of switching on damping resistors between the pig stations and their potential connection is shown in Fig. 4, in which the Elements 1 to 8 correspond to the embodiment of FIG. 1. The resistor arrangement is formed here by the parallel connection of the external damping resistor 24 with a controlled switch 25. The damping resistor is activated in this embodiment by opening the switch 24 only during the time in which it is needed, so when approaching the conductive medium to the pig destination station. In the remaining time, the damping resistor is bridged by the switch 25, so that the high voltage generator 4 is connected directly to the pig station 2 and the atomizer 3, as in the other embodiments, especially in the coating.

Der Schalter 25 kann automatisch z.B. durch Signale von (nicht dargestellten) Sensoren gesteuert werden, die in an sich bekannter Weise die Positionen der Lacksäule oder des sonstigen zwischen den Molchen geförderten leitfähigen Mediums überwachen und melden.The switch 25 can be automatically switched e.g. be controlled by signals from sensors (not shown) which monitor and report in a conventional manner the positions of the paint column or the other conveyed between the pig conductive medium.

Claims (17)

  1. A method of controlling the potential of a pigged conduit assembly, through whose conduit (5), in an installation for serially electrostatically coating workpieces, the electrically conductive coating material or another conductive medium (6) is conveyed between two pig stations (1, 2) using at least one pig (7, 8) wherein, in operation, an electrically conductive component of one pig station (1) is at low potential or earth potential and an electrically conductive component of the other pig station (2) is at a high voltage potential, which is produced by a high voltage generator (4) for the applicator (3) of the installation, wherein the conductive medium (6), which is initially at the potential of the pig transmitting station, is charged or discharged, on approach to the pig end station, to the potential thereof and wherein the conduit (5) acts as an insulating section for the potential separation of the two pig stations (1, 2), characterised in that the conductive medium (6) conveyed through the conduit (5) is brought to the potential of the pig end station, when approaching the pig end station, via an electrical resistor (13, 14, 5'), which is situated outside the electrical connection of the high voltage generator (4) with the applicator (3), at least during the coating of the workpieces.
  2. A method as claimed in Claim 1, characterised in that the conductive medium (6) is charged or discharged by a resistor (13, 14) connected between the potential of the pig end station and an electrically conductive contact point (10, 12) of the conduit (5).
  3. A method as claimed in Claim 1, characterised in that the conductive medium (6') is charged or discharged by the conduit (5') constituting the resistor.
  4. A method as claimed in Claim 1, characterised in that the conductive medium (6) is charged via a resistor (24), which, on approach of the conductive medium to the pig end station (2), is connected into the electrical connection of the high voltage generator (4) with the applicator (3) and is electrically conductively bridged during the coating process.
  5. A method as claimed in one of the preceding claims, characterised in that the conductive medium (6) is conveyed between two pigs (7, 8) through the conduit (5), which contains an insulating medium for the purpose of potential separation on the sides of the pigs remote from the conductive medium.
  6. Apparatus for the control of the potential of a pigged conduit assembly in an installation for the serial electrostatic coating of workpieces (1) including a first pig station (1), which has an electrically conductive component at low potential or earth potential, a second pig station (2), which has an electrically conductive component at high voltage potential, a conduit (5) disposed between the two pig stations, through which the conductive medium is conveyed using at least one pig (7, 8) and which constitutes an insulating section for the potential separation of the two pig stations (1, 2), a high voltage generator (4), which is connected to the second pig station (2) and to the applicator (3) of the installation and an arrangement including at least one electrical resistor (13, 14, 5'), by means of which the conductive medium is charged or discharged on approach to the first and/or second pig station (1, 2), characterised in that the electrical resistor (13, 14; 5'; 24) is situated outside the electrical connection of the high voltage generator (4) with the applicator (3), at least during coating of the workpieces.
  7. Apparatus as claimed in Claim 6, characterised in that the resistor (13, 14, 5') is connected electrically in parallel with the insulating section defined between the conductive medium and the electrically conductive component of the pig station on approach of the conductive medium (6) to the pig station (1, 2).
  8. Apparatus as claimed in Claim 6 or 7, characterised in that the resistor (13, 14) is connected between a connector at the potential of the pig station (1, 2) and an electrically conductive contact element (10, 12), which is inserted into the conduit (5) in the vicinity of the pig station (1, 2) and contacts the conductive medium (6).
  9. Apparatus as claimed in Claim 8, characterised in that a contact element (10, 12) is provided at each of the two pig stations (1, 2).
  10. Apparatus as claimed in Claim 6 or 7, characterised in that the electrical resistor is constituted by the conduit (5').
  11. Apparatus as claimed in Claim 10, characterised in that the conduit consists of a hose (5') with at least two layers and the innermost layer constitutes or includes the resistor whilst the outermost layer consists of insulating material.
  12. Apparatus as claimed in Claim 6, characterised in that a resistor (24) is connected into the connection between the high voltage generator (4) and the applicator (3) and/or between a potential connection of the pig station (1) at low potential or earth potential and its conductive component and that at least the resistor (24) situated between the high voltage generator (4) and the applicator (3) is controllably bridgeable by a conductive connection (25).
  13. A piggable hose for an apparatus for controlling the potential of a conduit assembly as claimed in Claim 10 or 11 with two pig stations (1', 2'), of which one is at low potential or earth potential and the other is at high voltage potential, characterised in that the electrical resistance of the hose (5') is so sized that the hose serves on the one hand as an insulating section for potential separation of the two pig stations (1', 2') and on the other hand the conductive medium (6'), on approach to the pig end station, charges up or discharges to the potential thereof before a voltage breakdown occurs between the conductive medium (6') and a conductive component of the pig station (1', 2').
  14. A piggable hose as claimed in Claim 13, characterised in that it consists of at least two layers, of which the innermost layer constitutes or includes the resistance of the hose (5') whilst the outermost layer consists of insulating material.
  15. A piggable hose as claimed in Claim 13 or 14, characterised in that at least the layer constituting its inner surface consists of a plastic material, in which electrically conductive particles are embedded in order to define the electrical resistance of the hose.
  16. A piggable hose as claimed in Claim 13 or 14, characterised in that threads or tracks of a material with conductivity defining the electrical resistance of the hose are disposed or defined on the inner surface of the hose.
  17. A piggable hose as claimed in one of Claims 13 to 16, characterised in that it is transparent.
EP04016358A 2003-07-23 2004-07-12 Method and device for the potential control of a pigged pipes arrangement Expired - Lifetime EP1500435B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10333547 2003-07-23
DE10333547A DE10333547A1 (en) 2003-07-23 2003-07-23 Method and device for potential control of a common line arrangement

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EP1500435A2 EP1500435A2 (en) 2005-01-26
EP1500435A3 EP1500435A3 (en) 2005-12-21
EP1500435B1 true EP1500435B1 (en) 2007-03-14

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EP (1) EP1500435B1 (en)
AT (1) ATE356672T1 (en)
DE (2) DE10333547A1 (en)
ES (1) ES2281720T3 (en)

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DE102012001563B4 (en) 2012-01-27 2019-05-09 Dürr Systems Ag Paint booth with a coating agent line and corresponding production method for the coating agent line
CN104066263A (en) * 2013-03-20 2014-09-24 鸿富锦精密电子(天津)有限公司 Electrostatic gun
DE202014002818U1 (en) 2014-04-01 2014-05-06 Eisenmann Ag Coating system for coating objects

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DE19961271A1 (en) 1999-12-18 2001-07-05 Duerr Systems Gmbh Painting device
DE10033987A1 (en) 2000-07-13 2002-01-24 Duerr Systems Gmbh Process for supplying a coating member for the electrostatic series coating of workpieces and supply system therefor
DE10131562A1 (en) 2001-06-29 2003-01-16 Duerr Systems Gmbh Method and system for supplying a coating device
DE10157966A1 (en) 2001-11-27 2003-06-05 Duerr Systems Gmbh Method and supply system for the metered supply of material to a coating device
DE10239516A1 (en) 2002-08-28 2004-03-18 Dürr Systems GmbH Hose with pig for delivery of electrically conductive fluid paints or varnishes at high voltage comprises an inner layer enclosed in an insulating layer with high voltage resistance
DE10313063A1 (en) 2002-09-11 2004-04-01 Dürr Systems GmbH connecting element

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EP1500435A2 (en) 2005-01-26
DE502004003193D1 (en) 2007-04-26
EP1500435A3 (en) 2005-12-21
DE10333547A1 (en) 2005-02-10
ES2281720T3 (en) 2007-10-01
ATE356672T1 (en) 2007-04-15

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