EP3703866A1 - Elektrostatischer zerstäuber zur elektrostatischen beschichtung von werkstücken - Google Patents
Elektrostatischer zerstäuber zur elektrostatischen beschichtung von werkstückenInfo
- Publication number
- EP3703866A1 EP3703866A1 EP18723473.7A EP18723473A EP3703866A1 EP 3703866 A1 EP3703866 A1 EP 3703866A1 EP 18723473 A EP18723473 A EP 18723473A EP 3703866 A1 EP3703866 A1 EP 3703866A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrostatic
- high voltage
- atomizer
- coating system
- control unit
- 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.)
- Withdrawn
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 26
- 239000011248 coating agent Substances 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000009503 electrostatic coating Methods 0.000 claims description 21
- 238000010422 painting Methods 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 6
- 238000007786 electrostatic charging Methods 0.000 claims description 3
- 238000007600 charging Methods 0.000 abstract description 33
- 239000003973 paint Substances 0.000 description 17
- 239000007921 spray Substances 0.000 description 10
- 230000007246 mechanism Effects 0.000 description 8
- 239000006199 nebulizer Substances 0.000 description 4
- 238000007591 painting process Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 235000010678 Paulownia tomentosa Nutrition 0.000 description 1
- 240000002834 Paulownia tomentosa Species 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
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
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
- B05B5/043—Discharge apparatus, e.g. electrostatic spray guns using induction-charging
-
- 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
- B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B16/00—Spray booths
Definitions
- Electrostatic atomizer for the electrostatic coating of workpieces
- the invention relates to an electrostatic atomizer for the electrostatic coating of workpieces, in particular for coating vehicle bodies or parts thereof, with a coating material.
- electrostatic atomizers which are a coating material, in particular paints such.
- paints such as paints
- Wet paint or powder paint spray and electrically charged.
- the atomized paint droplets or paint particles are ionized and accelerated toward the workpiece by means of an electric field established between the electrostatic atomizer and the workpiece, thereby increasing the deposition efficiency during coating.
- this is a triboelectric charging, in which the atomized particles rub against a non-conductive material and are charged electrostatically, similar to the charging of a balloon with the help of animal skins.
- the so-called internal charging is known in which the coating material is charged directly before the atomization inside the atomizer via an inner electrode.
- paint robots are arranged with different atomizers, or arranged in a paint booth several painting robots.
- a painting robot can also accommodate different electrostatic atomizers as a tool to obtain the desired Lackiertex.
- this requires corresponding changeover times during the overall coating process.
- an electrostatic atomizer of the type mentioned in which the electrostatic atomizer for electrostatic charging of the coating material has both an inner electrode and an outer electrode.
- the inventors have recognized that, despite the increased cabling effort, which is difficult to design due to the high voltages used in the range of up to about 150kV, it may be useful to provide both an inner electrode and an outer electrode for charging, to provide an electrostatic atomizer for one combined indoor and outdoor charging. Because such an electrostatic atomizer with inner and outer electrode allows switching between the different chargeability Auflademechanismen on the atomizer itself. This eliminates known disadvantages such as increased space requirements or changeover times for a tool change to Lackierrobtoren. In addition, there are further advantages through the combined internal and external charging. Thus, already the application of the same high voltage to the inner electrode and the outer electrode via a common electrical lead can be advantageous. Because it can be achieved by a higher throughput of the charged coating material.
- the inner electrode and the outer electrode can each be controlled separately via their own electrical supply line, as a result of which further diverse control schemes can be carried out and, above all, switching between different charging mechanisms can be realized.
- the electrostatic atomizer may have a plurality of external electrodes, which are each controlled by a separate electrical supply line.
- a ring of outward-facing external electrodes is provided for external charging at the front head end of the atomizer, surrounding the front part of the atomizer.
- the outer electrodes protrude thereby in the vicinity of the spray cone or into this.
- the outer electrode may be adapted to be brought into at least two different positions with respect to the front end of the atomizer.
- the outer electrode may have a mechanism with which it can be applied to the atomizer head or spread apart from it. This will reduce the outside dimensions of the nebulizer when, for example, external charging is turned off. This can be advantageous, for example, when painting the interior of a vehicle body.
- the position change of the outer electrode can be caused by actuators on the atomizer, such as air actuators.
- the outer electrode has two latching positions and from the outside corresponding actuating forces acting on the outer electrode, for example by the painting robot moves the atomizer with the outer electrode at a stop along.
- an electrostatic coating system can be provided with the electrostatic atomizer according to the invention.
- the electrostatic coating system may comprise at least one high voltage source connected to the inner electrode, the outer electrode or both, and a control unit configured to drive the at least one high voltage source.
- control unit can control different charging constellations.
- the electrostatic coating system may comprise two high voltage sources, wherein one of the two high voltage source is connected to the inner electrode and the other of the two high voltage sources to the outer electrode.
- control unit may be configured to apply high voltage of the same height or different height to the inner electrode and the outer electrode.
- this can also include complete switching off of the high voltage at the inner electrode or at the outer electrode.
- the control unit can also be set up to switch off and on the high voltage at the inner electrode and the outer electrode simultaneously or else at the same time.
- control unit may be configured to change the respective high voltage of one or both of the high voltage sources continuously or quasi-continuously, in particular in opposite directions, with two high voltage sources, from one end value to another final value.
- the control unit may preferably be designed to control the plurality of external electrodes separately.
- an asymmetric external charging can be generated, which in turn generates an asymmetric spray cone.
- the effect of the spray pattern change can be enhanced by a corresponding individual control of the high voltage at the individual electrodes. Because the higher the voltage applied to an outer electrode high voltage, the more spreads the spray cone in that section plane in which the outer electrode is located with respect to a central axis.
- the associated high-voltage source can have a plurality of switchable outputs, which are controlled by the control unit.
- the control unit for the individual leads each drive its own high voltage sources.
- individual outer electrodes can be combined into groups, which can be acted upon in each case via a supply line together with a common high voltage.
- control unit may preferably be set up such that initially a basic charge is generated via the inner electrode and the spray pattern is changed by connecting or disconnecting individual outer electrodes.
- an electrostatic atomizer according to the invention and / or an electrostatic coating system according to the invention can be used for painting vehicle bodies or parts thereof. This increases the efficiency of the overall coating process over the previously known prior art.
- Figure 1 shows an electrostatic atomizer according to the invention with an inner electrode and a ring of outer electrodes with two separate high voltage sources
- Figure 2 shows an electrostatic atomizer according to the invention with an inner electrode and a ring of separately controllable outer electrodes
- FIG. 3 shows an electrostatic atomizer according to the invention with an inner electrode and a ring of separately controllable and can be hinged to the atomizer outer electrodes;
- FIG. 4 shows an electrostatic atomizer according to the invention with an inner electrode and a ring of outer electrodes with a common high-voltage source;
- FIG. 1 shows an electrostatic coating system, denoted as a whole by 10, with an electrostatic atomizer 11, here in the form of a rotary atomizer.
- the electrostatic atomizer 1 1 has a paint line 12, via which a rotary bell cup 14 at the front distal end of the electrostatic atomizer 1 1, a paint 16 is supplied as a coating material.
- the electrostatic atomizer 1 1 then generates an initially rotationally symmetrical spray cone 18 of atomized paint 16, which is directed onto a workpiece 20.
- the workpiece 20 for electrostatic coating via a holding device, not shown here, such as a skid for the promotion of vehicle bodies, electrically connected to ground potential 22.
- the electrostatic atomizer 1 1 in the paint line 12 an electrically conductive region as an inner electrode 24 for the internal charging of the paint 16 before sputtering of the coating material.
- This inner electrode 24 is connected via an electrical supply line 26 to a first high-voltage source 28, which in turn is in turn driven by a control unit 30.
- the electrostatic atomizer 1 1 in addition to the inner electrode 24 at its front end a ring of a plurality of outer electrodes 32 a, 32 b and 32 c, of which only three are shown in the drawing.
- the exact number of external electrodes 32a, 32b and 32c generally depends on the configuration of the nebulizer 11.
- the outer electrodes 32a, 32b and 32c are each connected via an electrical lead 34 to a second high voltage source 36.
- the second high-voltage source 36 is also actuated by the control unit 30.
- the electrostatic coating system 10 of Figure 1 operates as follows:
- control unit 30 drives either the first high voltage source 28 or the second high voltage source 36 or both to set the inner electrode 24 or the outer electrodes 32a, 32b, 32c under high voltage against the workpiece 20 and thereby to achieve an electrostatic charge of the paint 16.
- control unit 30 for painting the inside of a vehicle body can only activate the internal charging via the first high-voltage source 28 and only activate the external charging via the second high-voltage source 36 for the painting process on the outside of the vehicle body.
- control unit 30 is also configured, for example, to activate a basic charge via the first high-voltage source 28 by specifying a high-voltage value there.
- the external charging can then additionally be activated via the second high-voltage source 36.
- the control unit 30 may also be configured to continuously change from the internal charging via the first high voltage source 28 into an external charging via the second high voltage source 36 by gradually reducing the charge via the internal electrode 24 while charging via the external electrodes 32a, 32b and 32c is gradually increased.
- the control unit 30 can also be operated in reverse tung generating a corresponding transition. In this way, with the electrostatic atomizer 1 1 most different transitions between internal charging and external charging of the coating material are conceivable and possible.
- FIG. 2 shows an electrostatic coating system 10, which differs from the exemplary embodiment according to FIG. 1 in that individual electrical supply lines 34a, 34b and 34c are provided for the individual outer electrodes 32a, 32b and 32c of the atomizer 11, which are connected to the second high-voltage source 36 are connected.
- the second high-voltage source 36 and the control unit 30 are arranged so that the individual outer electrodes 32a, 32b and 32c can be misted separately from one another with high voltage.
- control unit 30 by respective driving of the second high voltage source 36 respectively drive certain of the outer electrodes 32 a, 32 b or 32 c to generate an external charging, which generates an asymmetric shape for the spray cone 18.
- FIG. 3 shows an electrostatic coating system 10, which differs from the exemplary embodiment according to FIG. 2 in that the individual outer electrodes 32a, 32b and 32c of the atomizer 11 are each connected to the front end of the atomizer 11 via a latching joint 33.
- this allows the outer electrodes 32a, 32b and 32c to be brought into different positions.
- This makes it possible, for example, for the painting of the interior of a vehicle body, the high voltage on the outer electrodes 32a, 32b and 32c turn off and reduce the outer dimensions of the nebulizer 1 1 by folding the same.
- the embodiment shown in Figure 3 also differs in the design of the high voltage source 36 for the outer electrodes 32a, 32b and 32c and their control via the control unit 30th
- the local high-voltage source 36 has at its output a type of multiplex switch which switches the respective outputs for the electrical leads 34a, 34b and 34c on or off in order to activate different outer electrodes 32a, 32b and 32c.
- This multiplex switch can then be controlled via the control line between the control unit 30 and the high voltage source 36.
- Figure 3 shows a modification with several high voltage sources 36 for the respective leads 34a, 34b and 34c. This makes it possible to apply the individual outer electrodes 34a, 34b and 34c even with different high voltages.
- individual outer electrodes 34a, 34b and 34c can also be fed in groups, in each case via a common supply lines 34a, 34b and 34c.
- FIG. 4 shows an electrostatic coating system 10, which differs from the previous exemplary embodiments in that for the inner electrode 24 and the ring of outer electrodes 32a, 32b and 32c only one common first high-voltage source 28 is provided by the two electrical leads 26 and 34, preferably within the Zerstäuberkopfes, are interconnected. As a result, the internal charging and the external charging can only be switched on and off together.
- Another variation, not shown, of the invention comprises a nebulizer, which in addition to the paint line 12 described above, also has a further paint line, which is optionally equipped with or without internal electrode. In this way, different types of paint can be used even more easily with both internal charging and external charging.
Landscapes
- Electrostatic Spraying Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017113180.9A DE102017113180A1 (de) | 2017-06-14 | 2017-06-14 | Elektrostatischer Zerstäuber zur elektrostatischen Beschichtung von Werkstücken |
| PCT/EP2018/061764 WO2018228751A1 (de) | 2017-06-14 | 2018-05-08 | Elektrostatischer zerstäuber zur elektrostatischen beschichtung von werkstücken |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3703866A1 true EP3703866A1 (de) | 2020-09-09 |
Family
ID=62143152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18723473.7A Withdrawn EP3703866A1 (de) | 2017-06-14 | 2018-05-08 | Elektrostatischer zerstäuber zur elektrostatischen beschichtung von werkstücken |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20200164391A1 (de) |
| EP (1) | EP3703866A1 (de) |
| CN (1) | CN110740818A (de) |
| DE (1) | DE102017113180A1 (de) |
| WO (1) | WO2018228751A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102500430B1 (ko) * | 2021-03-23 | 2023-02-16 | 주식회사 프로텍 | 튜브형 외부 전극을 구비하는 전기수력학적 펌프 헤드 조립체 |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5117235A (en) * | 1974-08-04 | 1976-02-12 | Senichi Masuda | Seidenfuntaitochakusochi |
| US4228961A (en) * | 1979-05-07 | 1980-10-21 | Onoda Cement Co., Ltd. | Electrostatic power painting head |
| DE4105116C2 (de) * | 1991-02-19 | 2003-03-27 | Behr Industrieanlagen | Vorrichtung und Verfahren zum elektrostatischen Beschichten von Gegenständen |
| DE10202711A1 (de) * | 2002-01-24 | 2003-07-31 | Duerr Systems Gmbh | Zerstäuber für die elektrostatische Serienbeschichtung von Werkstücken |
| CA2591539C (en) * | 2004-12-28 | 2012-05-15 | Ransburg Industrial Finishing K.K. | Electrostatic paint sprayer |
| DE102005000983A1 (de) * | 2005-01-07 | 2006-07-20 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Universeller Ionisierungsaufsatz für ein Sprühgerät, elektrostatisches Sprühgerät und Sprühbeschichtungsverfahren zur Sprühbeschichtung |
| FR2942415B1 (fr) * | 2009-02-24 | 2011-03-11 | Sames Technologies | Projecteur electrostatique comportant des electrodes mobiles et procede de projection electrostatique mettant en oeuvre un tel projecteur. |
| DE102009013979A1 (de) * | 2009-03-19 | 2010-09-23 | Dürr Systems GmbH | Elektrodenanordnung für einen elektrostatischen Zerstäuber |
| DE102010019612A1 (de) * | 2010-05-06 | 2011-11-10 | Dürr Systems GmbH | Beschichtungseinrichtung, insbesondere mit einem Applikationsgerät, und zugehöriges Beschichtungsverfahren, das einen zertropfenden Beschichtungsmittelstrahl ausgibt |
| CN104364016B (zh) * | 2012-06-06 | 2016-08-24 | Abb株式会社 | 静电涂装装置 |
| 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 |
-
2017
- 2017-06-14 DE DE102017113180.9A patent/DE102017113180A1/de active Pending
-
2018
- 2018-05-08 EP EP18723473.7A patent/EP3703866A1/de not_active Withdrawn
- 2018-05-08 CN CN201880039541.1A patent/CN110740818A/zh not_active Withdrawn
- 2018-05-08 US US16/622,339 patent/US20200164391A1/en not_active Abandoned
- 2018-05-08 WO PCT/EP2018/061764 patent/WO2018228751A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CN110740818A (zh) | 2020-01-31 |
| US20200164391A1 (en) | 2020-05-28 |
| WO2018228751A1 (de) | 2018-12-20 |
| DE102017113180A1 (de) | 2018-12-20 |
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