EP0283936B1 - Procédé de commande d'une installation de revêtement électrostatique - Google Patents
Procédé de commande d'une installation de revêtement électrostatique Download PDFInfo
- Publication number
- EP0283936B1 EP0283936B1 EP88104265A EP88104265A EP0283936B1 EP 0283936 B1 EP0283936 B1 EP 0283936B1 EP 88104265 A EP88104265 A EP 88104265A EP 88104265 A EP88104265 A EP 88104265A EP 0283936 B1 EP0283936 B1 EP 0283936B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- current
- value
- voltage
- electrodes
- operating current
- 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
Links
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
- 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
- B05D1/06—Applying particulate materials
-
- 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.
- the voltage of the high-voltage generator applied to the spraying devices was previously customary to stabilize the voltage of the high-voltage generator applied to the spraying devices to constant values, which could be set in stages, for example in the range from 60 to 100 kV, to take into account the respective operating conditions. If the voltage is kept at a constant value, problems occur, in particular, in the case of the external charging of the coating material by corona discharge, since under certain circumstances considerable fluctuations in the corona current can occur during operation.
- the corona current is significantly higher than the normal operating current for conventional contact charging of the coating material in the atomizer and depends not only on the electrode voltage, but also on various environmental conditions such as air humidity and possible contamination of the electrode area.
- the corona operating current can fluctuate between 100 and 300 uA if the air humidity changes between 30% and 90%, as is easily possible in practice.
- Both too low and too high operating currents must be avoided, because in the first case insufficient ionization occurs, resulting in an unsatisfactory coating efficiency (ratio between sprayed material and the material reaching the workpiece), while in the second case there is a risk of overloading the Color mists with space charge effects exist, which experience has shown that they can almost completely suppress the corona current and ionization.
- the electrodes, their holder arrangement and other parts of the atomizer can be contaminated quickly by the sprayed-off material.
- DE-OS 34 45 946 it is known to electrostatically coat large workpieces such as e.g. Vehicle bodies automatically switch off the system to avoid a voltage breakdown between the workpiece and the coating device when the operating current rises to a threshold value which is predetermined as a function of the operating voltage which can be adjusted within a certain range.
- a threshold value which is predetermined as a function of the operating voltage which can be adjusted within a certain range.
- all current threshold values that apply to the selectable voltage values are stored together, in particular in a microprocessor, and are automatically selected during operation in accordance with the respectively set voltage.
- a warning signal can also initially only be generated if the current measured continuously during operation exceeds an intermediate threshold value between the normal value and the switch-off threshold value.
- the invention described here is based on the object of specifying a method which is used in the operation of a corona discharge and constant voltage operating system largely avoids the risk of self-contamination of the spray device.
- the high-voltage generator can also be controlled in direct dependence on the air humidity in the sense of a constant corona current.
- the predetermined current value to be maintained need not be the same for all operating conditions.
- the supply voltage of the electrodes has to be changed to keep the operating current constant, these changes also allow conclusions to be drawn about correct or faulty operation. For example, in the event of a short circuit, increasing contamination, or an approach of the workpiece to the spraying device that is dangerous with regard to a voltage breakdown, there is a tendency for a steep current rise, which is counteracted by a corresponding reduction in the voltage.
- the supply voltage of the electrodes is measured continuously, and if it falls below a limit value, an alarm signal can be generated and / or the coating system can be switched off. Under certain circumstances, the voltage limit value can be set depending on the respective operating conditions and changed automatically.
- An alarm signal can also be generated if the supply voltage changes impermissibly quickly during the control, or if the operating current changes by more than a permissible amount within a specified time, for example if the current control fails or works too slowly. Finally, an operating voltage that is too high can also trigger an error message.
- the described regulation of the corona operating current to a certain, usually constant value takes place during normal coating operation.
- the measured operating current can first be monitored by comparing it with predetermined voltage-dependent data to determine whether it exceeds or in particular exceeds permissible values, preferably in the aforementioned DE-OS 34 45 946 familiar way.
- an alarm signal is generated or the system is switched off, while if the intended current value is reached without errors, the current control is switched on, it now being determined for operational monitoring whether the supply voltage remains above the prescribed minimum value.
- the system can be switched over from current threshold operation to constant current operation automatically, for example when a predetermined voltage of the high-voltage generator is exceeded after it has been switched on.
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873709510 DE3709510A1 (de) | 1987-03-23 | 1987-03-23 | Verfahren zur betriebssteuerung einer elektrostatischen beschichtungsanlage |
DE3709510 | 1987-03-23 |
Publications (4)
Publication Number | Publication Date |
---|---|
EP0283936A2 EP0283936A2 (fr) | 1988-09-28 |
EP0283936A3 EP0283936A3 (en) | 1989-10-25 |
EP0283936B1 true EP0283936B1 (fr) | 1992-06-03 |
EP0283936B2 EP0283936B2 (fr) | 1997-01-02 |
Family
ID=6323791
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88104265A Expired - Lifetime EP0283936B2 (fr) | 1987-03-23 | 1988-03-17 | Procédé de commande d'une installation de revêtement électrostatique |
Country Status (19)
Country | Link |
---|---|
US (1) | US4851253A (fr) |
EP (1) | EP0283936B2 (fr) |
JP (1) | JPH0657338B2 (fr) |
KR (1) | KR930005171B1 (fr) |
CN (1) | CN1016583B (fr) |
AU (1) | AU599290B2 (fr) |
BR (1) | BR8801280A (fr) |
CA (1) | CA1288295C (fr) |
CZ (1) | CZ283607B6 (fr) |
DD (1) | DD268176A5 (fr) |
DE (2) | DE3709510A1 (fr) |
ES (1) | ES2004324T5 (fr) |
FI (1) | FI88466C (fr) |
HU (1) | HUT57087A (fr) |
MX (1) | MX169076B (fr) |
NZ (1) | NZ223921A (fr) |
PL (1) | PL157799B1 (fr) |
SK (1) | SK280705B6 (fr) |
SU (1) | SU1766240A3 (fr) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5080289A (en) * | 1990-05-25 | 1992-01-14 | Graco Inc. | Spraying voltage control with hall effect switches and magnet |
DE4105116C2 (de) * | 1991-02-19 | 2003-03-27 | Behr Industrieanlagen | Vorrichtung und Verfahren zum elektrostatischen Beschichten von Gegenständen |
DE19903824A1 (de) * | 1999-02-02 | 2000-09-14 | Daimler Chrysler Ag | System zur Überwachung eines elektrostatischen Zerstäubers |
DE10003295B4 (de) * | 2000-01-27 | 2006-05-04 | Eisenmann Maschinenbau Gmbh & Co. Kg | Verfahren zum elektrostatischen Beschichten eines Werkstücks sowie Vorrichtung zur Durchführung des Verfahrens |
DE60111632T2 (de) * | 2000-04-06 | 2006-05-18 | 3M Innovative Properties Co., Saint Paul | Elektrostatisch erregtes beschichtungsverfahren und vorrichtung mit fokussiertem elektrodenfeld |
DE10119521A1 (de) | 2001-04-20 | 2002-10-24 | Duerr Systems Gmbh | Verfahren zur Betriebssteuerung einer elektrostatischen Beschichtungsanlage |
US6708908B2 (en) | 2001-06-29 | 2004-03-23 | Behr Systems, Inc. | Paint atomizer bell with ionization ring |
CA2566233A1 (fr) * | 2004-08-10 | 2006-02-16 | Abb K.K. | Appareils pour revetement electrostatique |
JP2006051427A (ja) * | 2004-08-11 | 2006-02-23 | Anest Iwata Corp | 静電塗装用スプレーガン及び静電塗装方法 |
DE102009013561A1 (de) | 2009-03-17 | 2010-10-07 | Dürr Systems GmbH | Überwachungsverfahren und Überwachungseinrichtung für eine elektrostatische Beschichtungsanlage |
CN103689669B (zh) * | 2013-12-11 | 2016-06-08 | 荣成冠辰水产有限公司 | 一种烧烤三文鱼片食品的制作方法 |
DE102015215402A1 (de) * | 2015-08-12 | 2017-02-16 | Gema Switzerland Gmbh | Steuerschaltung zum Schutz gegen Funkenentladung |
CN108816542B (zh) * | 2018-06-11 | 2021-01-15 | 佛山市优正涂装科技有限公司 | 静电粉末喷枪系统的区域功率自动控制方法 |
JP7021042B2 (ja) * | 2018-09-26 | 2022-02-16 | トヨタ自動車株式会社 | 塗装装置 |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3809955A (en) * | 1973-03-26 | 1974-05-07 | Graco Inc | Safety circuit for electrostatic spray gun |
GB1454395A (en) * | 1973-07-26 | 1976-11-03 | Volstatic Coatings Ltd | Power supply voltage control circuit |
US3875892A (en) * | 1974-01-14 | 1975-04-08 | Ransburg Corp | Apparatus for avoiding sparks 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 |
US4258655A (en) * | 1976-04-21 | 1981-03-31 | Caterpillar Tractor Co. | Electrostatic spray apparatus |
US4075677A (en) * | 1976-08-09 | 1978-02-21 | Ransburg Corporation | Electrostatic coating system |
US4073002A (en) * | 1976-11-02 | 1978-02-07 | Ppg Industries, Inc. | Self-adjusting power supply for induction charging electrodes |
US4266262A (en) * | 1979-06-29 | 1981-05-05 | Binks Manufacturing Company | Voltage controlled power supply for electrostatic coating apparatus |
DE3219236A1 (de) * | 1981-07-08 | 1983-01-27 | Ernst Roederstein Spezialfabrik für Kondensatoren GmbH, 8300 Landshut | Verfahren und steuereinrichtung zum steuern der hochspannungseinrichtung eines elektrostatischen beschichtungsgeraetes |
JPS5953106B2 (ja) * | 1981-07-27 | 1984-12-22 | 日産自動車株式会社 | 静電塗装装置における吹付距離の制御方法 |
US4481557A (en) * | 1982-09-27 | 1984-11-06 | Ransburg Corporation | Electrostatic coating system |
FR2535917A1 (fr) * | 1982-11-04 | 1984-05-11 | Skm Sa | Procede pour alimenter en haute tension continue un appareil de pulverisation electrostatique et dispositif pour la mise en oeuvre du procede |
DE3300027A1 (de) * | 1983-01-03 | 1984-07-05 | Hermann Behr & Sohn Gmbh & Co, 7121 Ingersheim | Anlage zum erzeugen elektrischer hochspannung fuer farbspritzkabinen |
DE3416093A1 (de) * | 1984-04-30 | 1985-10-31 | J. Wagner AG, Altstätten | Elektronischer hochspannungserzeuger fuer elektrostatische spruehgeraete |
DE3429075A1 (de) * | 1984-08-07 | 1986-02-20 | Hermann Behr & Sohn Gmbh & Co, 7121 Ingersheim | Vorrichtung zum elektrostatischen beschichten von gegenstaenden |
DE3445946A1 (de) * | 1984-12-17 | 1986-06-19 | Hermann Behr & Sohn Gmbh & Co, 7121 Ingersheim | Verfahren und vorrichtung zur betriebsueberwachung einer elektrostatischen beschichtungsanlage |
DE3609240C2 (de) * | 1986-03-19 | 1996-08-01 | Behr Industrieanlagen | Vorrichtung zum elektrostatischen Beschichten von Gegenständen |
GB8622144D0 (en) * | 1986-09-15 | 1986-10-22 | Ici Plc | Electrostatic spraying apparatus |
-
1987
- 1987-03-23 DE DE19873709510 patent/DE3709510A1/de not_active Withdrawn
-
1988
- 1988-03-17 DE DE8888104265T patent/DE3871578D1/de not_active Expired - Lifetime
- 1988-03-17 EP EP88104265A patent/EP0283936B2/fr not_active Expired - Lifetime
- 1988-03-17 NZ NZ223921A patent/NZ223921A/xx unknown
- 1988-03-17 US US07/169,314 patent/US4851253A/en not_active Expired - Lifetime
- 1988-03-17 ES ES88104265T patent/ES2004324T5/es not_active Expired - Lifetime
- 1988-03-21 SU SU884355362A patent/SU1766240A3/ru active
- 1988-03-22 FI FI881346A patent/FI88466C/fi not_active IP Right Cessation
- 1988-03-22 AU AU13377/88A patent/AU599290B2/en not_active Ceased
- 1988-03-22 CA CA000562068A patent/CA1288295C/fr not_active Expired - Lifetime
- 1988-03-22 HU HU881440A patent/HUT57087A/hu unknown
- 1988-03-22 SK SK1873-88A patent/SK280705B6/sk unknown
- 1988-03-22 CN CN88101598A patent/CN1016583B/zh not_active Expired
- 1988-03-22 KR KR1019880003046A patent/KR930005171B1/ko not_active IP Right Cessation
- 1988-03-22 DD DD88313880A patent/DD268176A5/de not_active IP Right Cessation
- 1988-03-22 CZ CS881873A patent/CZ283607B6/cs not_active IP Right Cessation
- 1988-03-22 MX MX010848A patent/MX169076B/es unknown
- 1988-03-22 BR BR8801280A patent/BR8801280A/pt unknown
- 1988-03-23 JP JP63070814A patent/JPH0657338B2/ja not_active Expired - Fee Related
- 1988-03-23 PL PL1988271382A patent/PL157799B1/pl unknown
Also Published As
Publication number | Publication date |
---|---|
JPS63258669A (ja) | 1988-10-26 |
FI881346A (fi) | 1988-09-24 |
MX169076B (es) | 1993-06-21 |
SK187388A3 (en) | 2000-06-12 |
DE3871578D1 (de) | 1992-07-09 |
CZ187388A3 (en) | 1997-12-17 |
EP0283936A2 (fr) | 1988-09-28 |
PL271382A1 (en) | 1988-12-22 |
DD268176A5 (de) | 1989-05-24 |
EP0283936B2 (fr) | 1997-01-02 |
US4851253A (en) | 1989-07-25 |
CA1288295C (fr) | 1991-09-03 |
AU599290B2 (en) | 1990-07-12 |
CN88101598A (zh) | 1988-10-12 |
KR880010832A (ko) | 1988-10-24 |
SU1766240A3 (ru) | 1992-09-30 |
CZ283607B6 (cs) | 1998-05-13 |
EP0283936A3 (en) | 1989-10-25 |
FI881346A0 (fi) | 1988-03-22 |
ES2004324T3 (es) | 1993-02-16 |
FI88466C (fi) | 1993-05-25 |
ES2004324A4 (es) | 1989-01-01 |
SK280705B6 (sk) | 2000-06-12 |
DE3709510A1 (de) | 1988-10-06 |
JPH0657338B2 (ja) | 1994-08-03 |
AU1337788A (en) | 1988-09-22 |
PL157799B1 (pl) | 1992-07-31 |
BR8801280A (pt) | 1988-10-25 |
CN1016583B (zh) | 1992-05-13 |
ES2004324T5 (es) | 1997-04-01 |
KR930005171B1 (ko) | 1993-06-16 |
NZ223921A (en) | 1989-10-27 |
FI88466B (fi) | 1993-02-15 |
HUT57087A (en) | 1991-11-28 |
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