EP0185311B1 - Dispositif et procédé pour la régulation d'un appareil de pulvérisation électrostatique - Google Patents

Dispositif et procédé pour la régulation d'un appareil de pulvérisation électrostatique Download PDF

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Publication number
EP0185311B1
EP0185311B1 EP85115801A EP85115801A EP0185311B1 EP 0185311 B1 EP0185311 B1 EP 0185311B1 EP 85115801 A EP85115801 A EP 85115801A EP 85115801 A EP85115801 A EP 85115801A EP 0185311 B1 EP0185311 B1 EP 0185311B1
Authority
EP
European Patent Office
Prior art keywords
values
voltage
threshold
current
normal
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
Application number
EP85115801A
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German (de)
English (en)
Other versions
EP0185311A2 (fr
EP0185311A3 (en
Inventor
Peter Henger
Fred Luderer
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.)
Mahle Behr Industry GmbH and Co KG
Original Assignee
Behr Industrieanlagen GmbH and Co KG
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Behr Industrieanlagen GmbH and Co KG filed Critical Behr Industrieanlagen GmbH and Co KG
Publication of EP0185311A2 publication Critical patent/EP0185311A2/fr
Publication of EP0185311A3 publication Critical patent/EP0185311A3/de
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Publication of EP0185311B1 publication Critical patent/EP0185311B1/fr
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • 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
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/053—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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/10—Arrangements for supplying power, e.g. charging power

Definitions

  • the invention relates to a method according to the preamble of claim 1 and to an apparatus for performing the method according to the preamble of claim 5.
  • the breakthrough field strength is achieved with an impermissible reduction in the distance between the atomizer and the workpiece, that is to say with unstable workpiece guidance or, in the case of vehicle bodies mentioned, in particular when doors and hoods are opened unintentionally. Since there is no practically usable method for directly measuring the field strength in a coating system, the operating current of the high-voltage source is instead monitored and the system is automatically switched off when a predetermined current threshold is reached, and experience shows that there is a risk of breakthrough if exceeded. Since the current flowing between the high-voltage electrodes rises steeply immediately before the breakdown field strength is reached, the risk of breakdown can be ruled out as long as the operating current does not exceed the normal value measured at the start of operation by more than a predetermined amount.
  • the operating current does not change linearly with the voltage, especially in the upper part of the range of selectable voltage values, and because the measured operating current is only partially the current flowing between the electrodes, but otherwise consists of additional components such as a shunt current flowing from the high voltage source via the paint supply system.
  • the shunt current can already be significantly higher than the electrode current at the start of operation and also gradually increase during operation, for example as a result of increasing contamination of the shunt path.
  • its size is not a measure of the field strength to be monitored; on the other hand, it is not easily possible to measure only the electrode current.
  • the high voltage with a step switch z. B. can be changed in 5 steps of 10 kV each, before starting the coating the normal operating current for the selected voltage level is measured and an associated current threshold is set by hand with a potentiometer assigned to the voltage level, which is a certain amount higher than the measured Normal current. If the voltage changes, the process is repeated with another potentiometer assigned to the new voltage level. This method is unsatisfactory for several reasons.
  • a current monitoring system for a system for the electrostatic coating of vehicle bodies with a continuously selectable voltage in which the safety switch-off only in the event of rapid current changes as a result of dangerous proximity of body parts to the atomizer being at high voltage, but not in the case of slower ones Current change should be triggered, as is possible due to gradual pollution of the system.
  • the operating current is measured in short time intervals (every 200 ms) with the aid of a sample and hold circuit measured, the measured value compared with the previous measured value stored as a reference value and finally the current measured value stored as a new reference value.
  • the reference value, with which the operating current is constantly compared, therefore increases with the gradually increasing operating current.
  • the invention is based on the object of enabling an automatic adaptation of the switch-off threshold to the respectively selected voltage in the case of a safety shutdown for a system with high voltage which can be changed in the smallest stages without excessive effort.
  • the invention eliminates the manual setting of the switch-off threshold and its likewise manual voltage-dependent change using a large number of potentiometers.
  • an electrostatic coating system for vehicle bodies supplied in series by an automatic conveyor system measures the operating current I B of the high-voltage source as a function of the freely selectable high voltage in the range up to, for example, 110 kV between the spraying device and the body to be coated, typically obtained in FIG. 1 curve shown for this current I B It is composed essentially of two components, namely a shunt current IN, which flows from the high voltage source bypassing the spray device (conventionally at high voltage potential) via its paint supply line and other shunt paths to earth, and this to add, in Fig.1 the vertical distance between the curves of the currents IN and I B corresponding electrode current between the spraying device and the workpiece.
  • a shunt current IN which flows from the high voltage source bypassing the spray device (conventionally at high voltage potential) via its paint supply line and other shunt paths to earth
  • the operating current I B can increase significantly in the course of operation, namely by reducing the shunt resistance to earth with a corresponding increase in the shunt current IN, for example as a result of increasing contamination and / or by other changes.
  • This increase, for example, to the curves I N 'and I B ', for which the switch-off curve I ' AS would then apply, can lead to a disruptive, but practically unavoidable, interruption in operation during the coating process in the known systems.
  • the normal operating current can e.g. B. correspond in one case to the curve of the current I B and in the other case to the curve t'g in FIG. 1.
  • the resulting value of the operating current I B is measured.
  • the operating current values are preferably binary coded and supplied to a microprocessor ⁇ P (FIG. 2), which calculates the current threshold values belonging to the various voltage values according to curve I AS by enlarging them by a predetermined amount (eg by 30%).
  • ⁇ P microprocessor
  • the measured operating current values and / or the threshold values calculated from them can be stored in a data memory of the microprocessor and the calculations can accordingly be carried out before, during or after the storage, or possibly only when the data is subsequently output.
  • the memory can be addressed by a binary code supplied at A (FIG. 2) and corresponding to the voltage value selected in each case.
  • the read bits of the threshold value which likewise consists of a binary code, are fed in parallel to a binary comparison switch (not shown) which is contained in the control circuit ST and which, at its other inputs, carries the bits of an operating current measured in parallel by an A / D converter corresponding corresponding binary codes received.
  • the microprocessor controlled by the comparison switching mechanism When the operating current list reaches the stored threshold value, the microprocessor controlled by the comparison switching mechanism generates a switch-off signal Ab for the high-voltage source HS.
  • the microprocessor can receive commands from a higher-level process control system, which include an on / off signal, the selected voltage at input A, a "change" signal for controlling the transfer of the voltage code at input A from a data bus of the process control system and at an input W provides signals for the selection of possibly stored different voltage / current curves.
  • the microprocessor can in turn forward a corresponding analog control signal U solI to the high-voltage source HS via a D / A converter.
  • the microprocessor can receive fault messages from the high-voltage source HS or generate them for process control.
  • the operating current 1 8 which is only valid for certain normal conditions, and consequently the curves I zs and I AS which are based thereon, change due to changed operating parameters such as, in particular, another coating material whose influence on the operating current is known, it is not absolutely necessary to restart the operation before to determine normal operating current values by measuring. In such cases, it is rather possible for the computer to calculate the now applicable threshold values itself and to store different curves for the different operating parameters. The different curves are selected as required by the signals at input W already mentioned.
  • a display device AZ controlled by the computing and control circuit ST is provided, with which the respectively measured operating current I is together with the stored threshold values associated with the respectively selected high voltage and also the actual voltage U is optically displayable.
  • the actual values are converted into binary information by A / D converters.
  • the display device can be a digital display device and / or a display device in the form of a monitor, to which the information to be displayed is supplied in the form of parallel bits at the output Z of the control circuit ST.
  • the control circuit receives command signals at input B to output the desired information. The Operating personnel can therefore get a picture of the respective operating state, especially when the warning signal appears at output V.
  • each atomizer's own high voltage should be monitored, it is advisable to install a circuit board for each atomizer, which among other things equipped with the microprocessor IlP and the control circuit ST containing integrated circuits and can be implemented with little effort.
  • the system described here of automatically adapting a cut-off current threshold to the voltage selected in each case can be easily combined with other safety shutdown systems, in particular with the system known from DE-OS-2 734 341 (mentioned at the outset). Accordingly, it may be necessary to switch off the high voltage of the coating system before reaching the cut-off current threshold mentioned, namely, for. B. if the current changes faster, ie within a given period of time by a larger amount or percentage than is permitted for safety reasons.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (6)

1. Procédé pour la surveillance du fonctionnenent d'une installation de revêtement électrostatique fonctionnant avec une haute tension sélectionnable, pour des pièces importantes, en particulier amenées par un système de manutention automatique, telles que par exemple des carrosseries de véhicules, l'intensité de fonctionnement normale de la source de haute tension ainsi qu'un seuil supérieur d'intensité étant chaque fois d'abord choisis pour les différentes valeurs de hautes tension sélectionnables, seuil lors du déplacement duquel il y a risque d'un claquage de tension entre l'installation de revêtement et la pièce, l'intensité de fonctionnement étant ensuite constamment mesurée pendant le revêtement et comparée avec une valeur en mémoire et la source de haute tension étant automatiquement mise hors service lorsque le seuil d'intensité valant en fonction de la haute tension sélectionnée est atteinte,
caractérisé en ce que les valeurs normales d'intensité mesurées avant le revêtement pour chaque valeur de tension, et/ou les valeurs de seuil déterminées du fait des valeurs normales, sont mises en mémoire ensembles, et l'intensité de fonctionnement mesurée pendant le revêtement est chaque fois comparé à la valeur mise en mémoire sélectionnée automatiquement en fonction de la tension réglée.
2. Procédé selon la revendication 1, caractérisé en ce que les valeurs normale et de seuil de l'intensité sont mises en mémoire sous forme de données binaires et les valeurs de seuil d'intensité calculées numériquement à partie des valeurs normales.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que du fait des valeurs mises en mémoires en fonction des valeurs de tension choisies, une valeur de seuil intermédiaire située entre la valeur normale et la valeur de seuil de mise hors service est chaque fois réglée automatiquement, pour laquelle est produit un signal d'avertissement lorsqu'on la dépasse.
4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que les valeurs normal et de seuil sont chaque fois mises en mémoire ensemble pour des sortes de vernis différents ou d'autres conditions de fonctionnement et que les valeurs mises en mémoire sont sélectionnées sur la base des conditions chaque fois en vigueur.
5. Dispositif pour l'exécution du procédé selon l'une des revendications 1 à 4, avec un circuit de calcul et de commande (ST) contenant un dispositif de mémoire et un circuit de comparaison branché à la sortie du dispositif de mémoire, caractérisé en ce que le circuit de calcul et de commande (ST) contient un microprocesseur (pP) et une mémoire de données adressable par les valeurs de haute tension choisies, pour les données binaires correspondant aux valeurs normales prédéterminées et/ou aux valeurs de seuil, et un circuit de comparaison étant relié aux sorties de données de la mémoire, à qui est amenée l'intensité de fonctionnement mesurée (IReelle) en passant par un convertisseur analogique/numérique.
6. Dispositif selon la revendication 5, caractérisé en ce qu'est prévu un dispositif affichage (AZ) commandé par le circuit de calcul et de commande (ST), dispositif avec lequel sont affichables optiquement chaque intensité de fonctionnement mesurée (IRéelle)' et les valeurs de seuil mises en mémoire appartenant à la haute tension chaque fois choisie.
EP85115801A 1984-12-17 1985-12-11 Dispositif et procédé pour la régulation d'un appareil de pulvérisation électrostatique Expired EP0185311B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3445946 1984-12-17
DE3445946A DE3445946A1 (de) 1984-12-17 1984-12-17 Verfahren und vorrichtung zur betriebsueberwachung einer elektrostatischen beschichtungsanlage

Publications (3)

Publication Number Publication Date
EP0185311A2 EP0185311A2 (fr) 1986-06-25
EP0185311A3 EP0185311A3 (en) 1986-12-30
EP0185311B1 true EP0185311B1 (fr) 1989-04-19

Family

ID=6252973

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85115801A Expired EP0185311B1 (fr) 1984-12-17 1985-12-11 Dispositif et procédé pour la régulation d'un appareil de pulvérisation électrostatique

Country Status (5)

Country Link
US (1) US4764393A (fr)
EP (1) EP0185311B1 (fr)
CA (1) CA1246401A (fr)
DE (2) DE3445946A1 (fr)
ES (1) ES8704762A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102355955A (zh) * 2009-03-17 2012-02-15 杜尔系统有限责任公司 用于静电喷涂装置的监控方法和监控设备
EP0966084B2 (fr) † 1998-06-18 2012-10-17 SAMES Technologies Procédé de commande de moyens de déclenchement de sécurité dans un générateur de haute tension et générateur de haute tension mettant en oeuvre un tel procédé
CN106413910A (zh) * 2014-04-04 2017-02-15 固瑞克明尼苏达有限公司 具有外部充电点的静电喷枪
US10926275B1 (en) 2020-06-25 2021-02-23 Graco Minnesota Inc. Electrostatic handheld sprayer

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3709510A1 (de) * 1987-03-23 1988-10-06 Behr Industrieanlagen Verfahren zur betriebssteuerung einer elektrostatischen beschichtungsanlage
EP0626208B2 (fr) * 1993-04-08 2004-09-29 Nordson Corporation Alimentation électrique pour pistolet de pulvérisation électrostatique
FR2736772B1 (fr) * 1995-07-10 1997-08-22 Sames Sa Procedes, dispositif d'elaboration de haute tension et installation de projection electrostatique de produit de revetement
US6144570A (en) * 1997-10-16 2000-11-07 Illinois Tool Works Inc. Control system for a HVDC power supply
US5978244A (en) * 1997-10-16 1999-11-02 Illinois Tool Works, Inc. Programmable logic control system for a HVDC power supply
FI103769B (fi) * 1998-05-15 1999-09-30 Oms Optomedical Systems Ltd Oy Menetelmä ja laitteisto materiaalivirtauksen sähköiseen ohjaamiseen
DE19926926A1 (de) * 1999-06-14 2000-12-21 Itw Gema Ag Sprühbeschichtungseinrichtung
JP4786014B2 (ja) * 2000-06-29 2011-10-05 アネスト岩田株式会社 静電塗装装置
US20050136733A1 (en) * 2003-12-22 2005-06-23 Gorrell Brian E. Remote high voltage splitter block
USD530137S1 (en) 2005-09-28 2006-10-17 The Coleman Company, Inc. Beverage jug
CN103308741A (zh) * 2012-03-16 2013-09-18 鸿富锦精密工业（深圳）有限公司 服务器及其电流检测预警系统
JP7108803B1 (ja) * 2022-02-14 2022-07-28 シーエフティー エルエルシー 塗装装置及び高電圧安全制御方法
DE102024117796A1 (de) 2024-06-25 2026-01-08 Dürr Systems Ag Betriebsverfahren für eine elektrostatische Beschichtungsmittelaufladung und Beschichtungsanlage zur Ausführung des Betriebsverfahrens

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US3795839A (en) * 1967-09-01 1974-03-05 Graco Inc Method for preventing arcing in an electrostatic coating system
US3893006A (en) * 1974-01-14 1975-07-01 Nordson Corp High voltage power supply with overcurrent protection
DE2451818B2 (de) * 1974-10-31 1977-02-10 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zum elektrostatischen aufbringen von schutzschichten auf ein werkstueck und vorrichtung zu dessen durchfuehrung
US4075677A (en) * 1976-08-09 1978-02-21 Ransburg Corporation Electrostatic coating system
DE2836837A1 (de) * 1978-08-23 1980-03-06 Agfa Gevaert Ag Verfahren zur elektrofotografischen entwicklung von elektronenradiografischen folien, und vorrichtung zur durchfuehrung des verfahrens
US4402030A (en) * 1982-02-19 1983-08-30 Champion Spark Plug Company Electrostatic voltage control circuit
US4469723A (en) * 1982-11-01 1984-09-04 National Semiconductor Corporation Plating control system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0966084B2 (fr) † 1998-06-18 2012-10-17 SAMES Technologies Procédé de commande de moyens de déclenchement de sécurité dans un générateur de haute tension et générateur de haute tension mettant en oeuvre un tel procédé
CN102355955A (zh) * 2009-03-17 2012-02-15 杜尔系统有限责任公司 用于静电喷涂装置的监控方法和监控设备
CN102355955B (zh) * 2009-03-17 2015-09-09 杜尔系统有限责任公司 用于静电喷涂装置的监控方法和监控设备
CN106413910A (zh) * 2014-04-04 2017-02-15 固瑞克明尼苏达有限公司 具有外部充电点的静电喷枪
US10926275B1 (en) 2020-06-25 2021-02-23 Graco Minnesota Inc. Electrostatic handheld sprayer
US11738358B2 (en) 2020-06-25 2023-08-29 Graco Minnesota Inc. Electrostatic handheld sprayer

Also Published As

Publication number Publication date
US4764393A (en) 1988-08-16
ES8704762A1 (es) 1987-04-16
ES550975A0 (es) 1987-04-16
EP0185311A2 (fr) 1986-06-25
CA1246401A (fr) 1988-12-13
EP0185311A3 (en) 1986-12-30
DE3569485D1 (en) 1989-05-24
DE3445946A1 (de) 1986-06-19

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