EP0185311A2 - 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
EP0185311A2
EP0185311A2 EP85115801A EP85115801A EP0185311A2 EP 0185311 A2 EP0185311 A2 EP 0185311A2 EP 85115801 A EP85115801 A EP 85115801A EP 85115801 A EP85115801 A EP 85115801A EP 0185311 A2 EP0185311 A2 EP 0185311A2
Authority
EP
European Patent Office
Prior art keywords
values
voltage
current
normal
threshold
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.)
Granted
Application number
EP85115801A
Other languages
German (de)
English (en)
Other versions
EP0185311A3 (en
EP0185311B1 (fr
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
Hermann Behr and Sohn GmbH and Co
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.)
Filing date
Publication date
Application filed by Behr Industrieanlagen GmbH and Co KG, Hermann Behr and Sohn GmbH and Co filed Critical Behr Industrieanlagen GmbH and Co KG
Publication of EP0185311A2 publication Critical patent/EP0185311A2/fr
Publication of EP0185311A3 publication Critical patent/EP0185311A3/de
Application granted granted Critical
Publication of EP0185311B1 publication Critical patent/EP0185311B1/fr
Expired legal-status Critical Current

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Classifications

    • 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 an apparatus for performing the method.
  • 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 an unintentional opening of Doors and hoods. 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 excluded 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 partly 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 readily possible to measure only the electrode current.
  • the high voltage of which can be changed step by step using a step switch, for example in 5 steps of 10 kV
  • the normal operating current for the voltage level selected in each case is measured and assigned to one of the voltage levels potentiometer, an associated current threshold is set by hand, 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.
  • a current monitoring system for a system for the electrostatic coating of vehicle bodies with a continuously selectable voltage in which the S icherheitsabscrien only with rapid current changes due to dangerous approach of body parts to the atomizer at high voltage, not to be triggered at a slow current change but as it is possible as a result of gradual contamination of the plant.
  • the operating current is measured at short time intervals (every 200 ms) with the aid of a sample and hold circuit, the measured value is compared with the previous measured value stored as a reference value, and finally the current measured value is 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.
  • the operating current I B of the high-voltage source in the spray booth for example of an electrostatic coating system for vehicle bodies supplied in series by an automatic conveyor system, depending on the high voltage freely selectable in the range up to, for example, 110 kV between the spraying device and the body to be coated, typically one obtains that 1 curve for this current I B.
  • It essentially consists of two components, namely a shunt current IN, which flows from the high-voltage source to the earth bypassing the spray device (conventionally at high-voltage potential) via its paint supply line and other shunt paths, and the one to be added to this in Fig. 1 the vertical distance between the curves of the currents IN and I B corresponding electrode current between the spray device and the workpiece.
  • the operating current I B can increase significantly during 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 correspond, for example, to the curve of the current I B in one case and to the curve I ' B in FIG. 1 in the other case.
  • the resulting value of the operating current I B is measured under normal conditions for each of the selectable voltage values, which are preferably set in small steps of, for example, 1 kV or 0.5 kV, that is to say virtually continuously, before the actual coating operation begins .
  • the operating current values are preferably binary coded and fed 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 (for example by 30%).
  • a microprocessor ⁇ P FIG. 2
  • the measured in a data memory of the microprocessor stored operating current values and / or the threshold values calculated therefrom and accordingly the calculations are 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 also 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 I is receiving corresponding further binary codes.
  • the microprocessor controlled by the comparison switching mechanism When the operating current I has reached 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 controller, 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 controller and at an input W signals for the selection if necessary . stored different voltage / current curves.
  • the microprocessor On the basis of the voltage code at input A, the microprocessor in turn can forward a corresponding analog control signal U soll 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.
  • Ig.1 F I B and the trip curve lAS is another curve I shown ZS between the curve of the operating current.
  • These are intermediate threshold values which, like the switch-off threshold values according to curve IAS, are calculated by the microprocessor on the basis of the initially measured normal values of the operating current I B , stored and constantly compared with the actual operating current I ist . If the intermediate threshold values of curve I ZS are exceeded (which may be 15% higher than the normal operating current I B ), however, the high-voltage source HS is not switched off, but an acoustic and / or optical warning signal for the operating personnel only at the output V of the control circuit ST generated.
  • the calculator is a lot more possible to calculate the now applicable threshold values yourself and save 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 operating current I measured in each case , together with the stored threshold values associated with the respectively selected high voltage, and also the actual voltage U ist can be optically displayed.
  • 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 an idea of the respective operating state, especially when the warning signal appears at the output V.
  • the system described here of automatically adapting a switch-off current threshold to the voltage selected in each case can be easily combined with other safety switch-off systems, in particular with the system known from the (mentioned above) DE-OS 27 34 341. Accordingly, it may be necessary to switch off the high voltage of the coating system before the shutdown current threshold is reached, namely, for example, if the current changes faster, ie within a given period of time, by a larger amount or percentage than is permissible for safety reasons.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
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 true EP0185311A2 (fr) 1986-06-25
EP0185311A3 EP0185311A3 (en) 1986-12-30
EP0185311B1 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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0753923A1 (fr) * 1995-07-10 1997-01-15 Sames S.A. Procédés, dispositif d'élaboration de haute tension et installation de projection électrostatique de produit de revêtement
WO2010105738A1 (fr) 2009-03-17 2010-09-23 Dürr Systems GmbH Procédé de surveillance et dispositif de surveillance pour une installation de revêtement électrostatique

Families Citing this family (15)

* 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
DE69414756T3 (de) * 1993-04-08 2005-03-17 Nordson Corp., Westlake Stromversorgung für eine elektrostatische Sprühpistole
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
FR2780211B1 (fr) † 1998-06-18 2000-09-08 Binks Sames France Sa Procede de commande de moyens de declenchement de securite dans un generateur de haute tension et generateur de haute tension mettant en oeuvre un tel procede
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
CN106413910B (zh) * 2014-04-04 2020-07-31 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
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

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
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
EP0753923A1 (fr) * 1995-07-10 1997-01-15 Sames S.A. Procédés, dispositif d'élaboration de haute tension et installation de projection électrostatique de produit de revêtement
FR2736772A1 (fr) * 1995-07-10 1997-01-17 Sames Sa Procedes, dispositif d'elaboration de haute tension et installation de projection electrostatique de produit de revetement
US5847945A (en) * 1995-07-10 1998-12-08 Sames S.A. Processes, device for producing a high voltage and installation for electrostatic spraying of a coating product
WO2010105738A1 (fr) 2009-03-17 2010-09-23 Dürr Systems GmbH Procédé de surveillance et dispositif de surveillance pour une installation de revêtement électrostatique
EP2408569B1 (fr) 2009-03-17 2015-05-06 Dürr Systems GmbH Procédé de surveillance et dispositif de surveillance pour une installation de revêtement électrostatique
US9043169B2 (en) 2009-03-17 2015-05-26 Durr Systems Gmbh Monitoring method and monitoring device for an electrostatic coating plant

Also Published As

Publication number Publication date
DE3569485D1 (en) 1989-05-24
EP0185311A3 (en) 1986-12-30
DE3445946A1 (de) 1986-06-19
ES550975A0 (es) 1987-04-16
US4764393A (en) 1988-08-16
CA1246401A (fr) 1988-12-13
ES8704762A1 (es) 1987-04-16
EP0185311B1 (fr) 1989-04-19

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