EP4341002A1 - Elektrodenanordnung für einen rotationszerstäuber und zugehöriges betriebsverfahren - Google Patents
Elektrodenanordnung für einen rotationszerstäuber und zugehöriges betriebsverfahrenInfo
- Publication number
- EP4341002A1 EP4341002A1 EP22770006.9A EP22770006A EP4341002A1 EP 4341002 A1 EP4341002 A1 EP 4341002A1 EP 22770006 A EP22770006 A EP 22770006A EP 4341002 A1 EP4341002 A1 EP 4341002A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- rotary atomizer
- electrode arrangement
- cleaning device
- cleaning
- 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.)
- Pending
Links
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
- B05B5/053—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
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
- B05B12/32—Shielding elements, i.e. elements preventing overspray from reaching areas other than the object to be sprayed
-
- 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
- B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
- B05B12/32—Shielding elements, i.e. elements preventing overspray from reaching areas other than the object to be sprayed
- B05B12/36—Side shields, i.e. shields extending in a direction substantially parallel to the spray jet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
- B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
- B05B15/555—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids discharged by cleaning nozzles
-
- 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
- B05B5/035—Discharge apparatus, e.g. electrostatic spray guns characterised by gasless spraying, e.g. electrostatically assisted airless spraying
-
- 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
- B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
- B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
- B05B5/0407—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member with a spraying edge, e.g. like a cup or a bell
Definitions
- the invention relates to an electrode arrangement for electrostatically charging paint on the outside of a rotary atomizer. Furthermore, the invention includes a rotary atomizer which is equipped with an electrode arrangement according to the invention. Furthermore, the invention also includes an associated operating method.
- FIG. 1 shows a conventional rotary atomizer 1, which can be used, for example, to paint motor vehicle body components in a paint shop and, for this purpose, has a bell cup 2 which can be rotated about an axis of rotation 3.
- the rotary atomizer 1 has an angled atomizer housing 4, which can be mounted at its end located on the left in the drawing on a mounting flange of a painting robot, as is known per se from the prior art.
- the rotary atomizer 1 has a rotationally symmetrical tube 5 that tapers along the axis of rotation 3 of the bell cup 2 toward the bell cup 2 .
- the applied paint is electrostatically charged in order to increase the application efficiency and reduce the annoying overspray.
- the mounting ring 8 is used here for the exchangeable mounting of the electrode arrangement 6 on the rotary atomizer 1.
- the mounting ring 8 is slipped onto the tube 5 of the rotary atomizer 1 and then fixed on the rotary atomizer 1 in the position shown in the drawing.
- the mounting ring 8 leaves the tube 5 largely free. The consequence of this is that the overspray that occurs during the painting operation can be deposited on the tube 5 of the rotary atomizer 1 .
- the tube 5 of the rotary atomizer must therefore be cleaned regularly to remove the overspray that has adhered. This cleaning of the tube 5 is expensive.
- the invention is therefore based on the object of solving the problem of contamination of the tube of the
- the electrode arrangement according to the invention is used for the electrostatic external charging of paint on a rotary atomizer which has an atomizer housing with a frontal tube which preferably extends coaxially to the axis of rotation of the rotary atomizer towards a bell cup.
- the electrode arrangement according to the invention also has a mounting ring which serves to mount the electrode arrangement according to the invention on the rotary atomizer.
- the mounting ring of the electrode arrangement is placed on the atomizer housing of the rotary atomizer, specifically preferably on the tube of the rotary atomizer.
- At least one charging electrode is also arranged in the electrode arrangement according to the invention, which is used for electrostatic external charging of the paint sprayed by the rotary atomizer, the at least one charging electrode preferably protruding from the electrode arrangement, for example from the mounting ring.
- a plurality of finger-shaped charging electrodes are provided here, which are preferably distributed equidistantly over the circumference of the mounting ring. For example, three, four, six or eight charging electrodes can be distributed over the circumference.
- the electrode arrangement according to the invention is now characterized by a tube shielding, which protrudes from the front side of the mounting ring and, in the assembled state, extends along the axis of rotation of the rotary atomizer up to the tube of the rotary atomizer in order to shield at least part of the tube of the rotary atomizer on its outside from overspay.
- the tube shielding thus protects the covered part of the tube from contamination by the overspay that occurs during operation, so that the covered part of the tube does not have to be cleaned. Rather, it is sufficient to replace the electrode arrangement soiled by overspay with a clean electrode arrangement.
- the tube of the rotary atomizer has a distal cleaning area which, in the case of an automated cleaning process with a cleaning device, lies within the cleaning device and can therefore be cleaned by the cleaning device.
- the tube of the rotary atomizer in the preferred exemplary embodiment has a proximal residual area that adjoins the distal cleaning area, with the proximal residual area being outside of the cleaning device during a cleaning process with the cleaning device and therefore cannot be cleaned by the cleaning device.
- the tube shield at least partially, and preferably completely, covers the remainder of the proximal portion of the tube. Complete coverage of the remaining proximal area of the tube is advantageous here, because the remaining proximal area cannot be cleaned in the cleaning device and should therefore be protected from contamination by overspay by the tube shielding.
- the tube shield has a seal at its distal end to seal an annular gap between the tube shield and the tube of the rotary atomizer. This is advantageous in order to prevent overspray from penetrating into the annular gap between the tube shield and the tube of the rotary atomizer during operation, since this would lead to contamination of the tube in this area.
- This sealing between the tube shielding and the tube of the rotary atomizer is preferably effected by a sealing ring, which can have a sealing lip at its distal end, which rests on the outside of the tube.
- the sealing ring can, for example, be inserted into a ring-shaped circumferential groove in the end face of the tube shield.
- the tube shield is preferably made of an electrically insulating material such as polytetrafluoroethylene (PTFE).
- PTFE polytetrafluoroethylene
- the tube shielding is formed in one piece on the mounting ring of the electrode arrangement and thus consists of the same material as the mounting ring of the electrode arrangement.
- the tube shielding is an independent component that is attached to the mounting ring of the electrode arrangement and optionally consists of a different material than the mounting ring.
- the tube shielding has an inner contour which is shaped essentially complementarily to the outer contour of the tube of the rotary atomizer, so that the tube shielding nestles against the tube in the assembled state or has a ring-shaped circumference with the outer contour of the tube of the rotary atomizer Includes annular gap. With a conical outer contour of the tube of the rotary atomizer, the inner contour of the tube shielding is therefore preferably also conical.
- the aforementioned ring-shaped circumferential annular gap between the outer surface of the tube of the rotary atomizer on the one hand and the inner surface of the tube shield on the other hand preferably has a gap width in the radial direction that is essentially constant over the entire axial length of the tube shield. This preferably means that the gap width measured in the radial direction has deviations of less than ⁇ 30%, ⁇ 20%, ⁇ 10% or ⁇ 5% over the axial length of the tube shield.
- the ring-shaped annular gap between the outer contour of the tube of the rotary atomizer on the one hand and the surrounding tube shielding on the other hand can be filled with an electrically insulating medium (e.g. Vaseline).
- an electrically insulating medium e.g. Vaseline
- the tube shielding is preferably formed essentially rotationally symmetrically and can have a length of at least 3 cm, 5 cm, 7 cm, 9 cm, 11 cm or 13 cm in axial length along the axis of rotation of the rotary atomizer. to protect as much of the tube as possible from contamination by overspray.
- the tube shield preferably tapers in the distal direction, for example conically.
- the tube shield preferably surrounds the tube in a sleeve-like manner.
- this can preferably be mounted on the rotary atomizer so that it can be replaced.
- an electrical creepage distance is formed along the tube shielding between the charging electrodes, which are arranged proximally and are at high voltage potential, on the one hand, and the electrically grounded bell cup, on the other.
- This creepage distance should be as long as possible without the required overall length of the rotary atomizer being able to be lengthened as desired.
- the outer surface of the tube shielding therefore preferably has a creepage distance extension, which can consist in particular of a ripple on the outer surface or of a labyrinth, in order to lengthen the electrical creepage distance between the charging electrode and the bell cup.
- the invention also claims protection for a cleaning method for cleaning such a rotary atomizer.
- the cleaning method according to the invention initially provides that the rotary atomizer is inserted into a cleaning device through an insertion opening.
- the cleaning method according to the invention then provides that the insertion opening is sealed off by a seal.
- the next step is to clean the rotary atomizer in the cleaning device, for example by spraying the rotary atomizer with a cleaning liquid or a cleaning mixture and/or by brushing the rotary atomizer in the cleaning device.
- the insertion opening of the cleaning device after the rotary atomizer has been inserted can be sealed, for example, by a sealing ring which rests on the outside of the tube shielding of the electrode arrangement of the rotary atomizer or on the sealing ring or the sealing lip of the tube shielding.
- this sealing ring of the cleaning device covers the sealing ring of the tube shielding in the axial direction. The consequence of this is that the sealing ring of the cleaning device presses axially from the outside onto the tube shielding and thus increases the radial contact pressure of the sealing ring of the tube shielding.
- the sealing ring of the cleaning device lies axially offset in the sealed state with respect to the sealing ring of the tube shielding, which is also possible.
- the above-mentioned sealing of the insertion opening of the tube ring can take place, for example, with a contact seal (e.g. sealing ring) or with a non-contact seal, such as with a blown air ring.
- a contact seal e.g. sealing ring
- a non-contact seal such as with a blown air ring.
- FIG. 1 shows a side view of a conventional rotary atomizer with a conventional electrode arrangement for external electrostatic charging.
- FIG. 2 shows a sectional view of a rotary atomizer according to the invention with an electrode arrangement according to the invention during a cleaning process in a cleaning device.
- Figure 3A shows a modification of Figure 2.
- FIG. 3B shows an enlarged detailed view from FIG. 3A in the area of a sealing ring of the cleaning device.
- FIG. 4 shows a modification of FIGS. 1, 3A and 3B with an extension of the creepage distance.
- FIG. 5 shows a flow chart to clarify the cleaning method according to the invention.
- FIG. 2 The exemplary embodiment according to the invention shown in FIG. 2 is now described below, which largely corresponds to the conventional rotary atomizer 1 described at the outset, so that to avoid repetition, reference is made to the above description, with the same reference symbols being used for corresponding details.
- a special feature of this exemplary embodiment is that a tube shield 9 is formed on the mounting ring 8 of the electrode arrangement 6, which protrudes in the distal direction from the mounting ring 8 of the electrode arrangement 6 and covers the tube 5 of the rotary atomizer 1 and thus protects it from contamination from overspray protects.
- the inner contour of the tube shielding 9 is adapted to complement the outer contour of the tube 5, so that the tube shielding 9 encloses an annular gap 10 with the tube 5, which has a gap width that is along the axis of rotation 3 of the bell plate 2 is essentially constant.
- the annular gap 10 between the outer tube shielding 9 and the inner tube 5 is filled with an insulating medium (eg vaseline).
- the sleeve-like tube shielding 9 has a circumferential annular groove in which a sealing ring 11 is inserted, which rests sealingly on the outer surface of the tube 5 with its sealing lip projecting in the distal direction.
- the drawing shows the rotary atomizer 1 in a cleaning position within a cleaning device 12 .
- An annular gap forms between the outer contour of the tube shielding 9 and the peripheral edge of the insertion opening 13 of the cleaning device 12 and is sealed by a blast air ring 14 .
- the cleaning device 12 contains cleaning nozzles 15 which are used to clean the tube 5 of the rotary atomizer 1 in a distal cleaning area 16 by spraying the tube 5 with a cleaning liquid.
- the distal cleaning area 16 lies within the cleaning device 12 and can therefore be cleaned in the cleaning device 12 .
- a proximal residual area 17 adjoins the distal cleaning area 16 and cannot be cleaned in the cleaning device 12 since it is located outside of the cleaning device 12 during the cleaning process.
- the division of tube 5 into cleaning area 16 and residual area 17 is important with regard to tube shielding 9 .
- Tube shielding 9 completely covers tube 5 of rotary atomizer 1 within proximal residual area 17 .
- FIGS. 3A and 3B show a modification of the exemplary embodiment according to FIG. 2, so that to avoid repetition, reference is made to the above description, with the same reference symbols being used for corresponding details.
- a special feature of this exemplary embodiment is that the sealing of the insertion opening 13 of the cleaning device 12 is not effected by the blast air ring 14 according to Figure 2, but by a sealing ring 18, which lies in contact with the sealing ring 11 of the tube shield 9 and thus the sealing lip of the sealing ring 11 radially against the outer surface of the tube 5 presses.
- FIG. 4 shows a further modification of the exemplary embodiments described above according to FIGS. 2, 3A and 3B.
- a wavy creepage distance extension 19 is shown schematically, which lengthens the electrical creepage distance between the charging electrodes 7 and the electrically grounded bell cup 2 along the outer surface of the tube 5 .
- the creepage distance extension 19 is shown as a waviness.
- FIG. 5 shows a flow chart to clarify the cleaning method according to the invention.
- a first step S1 the painting robot inserts the rotary atomizer 1 into the cleaning device 12 through the insertion opening 13 .
- a second step S2 the insertion opening 13 of the cleaning device 12 is then sealed, optionally by the blast air ring 14 according to Figure 2 or by the sealing ring 18 according to Figures 3A, 3B.
- the rotary atomizer 1 is then cleaned in the cleaning device 12 by being sprayed with cleaning agent or a cleaning mixture.
- step S4 the rotary atomizer 1 is then dried in the cleaning device 12, for example by blowing compressed air on it.
- the invention is not limited to the preferred embodiments described above. Rather, the invention also includes a large number of variants and modifications that make use of the idea of the invention and therefore fall within the scope of protection.
- the invention also claims protection for the subject matter and the features of the subclaims independently of the claims referred to in each case and in particular also without the features of the main claim. The invention thus comprises various aspects of the invention which are protected independently of one another.
Landscapes
- Electrostatic Spraying Apparatus (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
- Nozzles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021123081.0A DE102021123081A1 (de) | 2021-09-07 | 2021-09-07 | Elektrodenanordnung für einen Rotationszerstäuber und zugehöriges Betriebsverfahren |
| PCT/EP2022/074310 WO2023036679A1 (de) | 2021-09-07 | 2022-09-01 | Elektrodenanordnung für einen rotationszerstäuber und zugehöriges betriebsverfahren |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4341002A1 true EP4341002A1 (de) | 2024-03-27 |
Family
ID=83322510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22770006.9A Pending EP4341002A1 (de) | 2021-09-07 | 2022-09-01 | Elektrodenanordnung für einen rotationszerstäuber und zugehöriges betriebsverfahren |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US12576414B2 (de) |
| EP (1) | EP4341002A1 (de) |
| JP (1) | JP2024531611A (de) |
| KR (1) | KR20240054286A (de) |
| CN (1) | CN117693399A (de) |
| DE (1) | DE102021123081A1 (de) |
| MX (1) | MX2024002656A (de) |
| WO (1) | WO2023036679A1 (de) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004061322A1 (de) * | 2004-12-20 | 2006-06-22 | Dürr Systems GmbH | Verfahren und Reinigungsgerät zum Reinigen einer Sprühvorrichtung |
| EP1911521B1 (de) * | 2005-08-01 | 2010-07-14 | Abb K.K. | Elektrostatische beschichtungsvorrichtung |
| DE102009013979A1 (de) | 2009-03-19 | 2010-09-23 | Dürr Systems GmbH | Elektrodenanordnung für einen elektrostatischen Zerstäuber |
| EP2859954B1 (de) | 2012-06-06 | 2019-09-04 | ABB Schweiz AG | Vorrichtung zum elektrostatischen lackieren |
| DE102014006647A1 (de) | 2014-05-07 | 2015-11-12 | Dürr Systems GmbH | Reinigungsgerät für einen Zerstäuber und zugehöriges Betriebsverfahren |
| JP6434675B2 (ja) * | 2016-02-19 | 2018-12-05 | Abb株式会社 | 静電塗装機 |
| DE102019107847B4 (de) | 2019-03-27 | 2021-09-23 | Dürr Systems Ag | Glockenteller, Rotationszerstäuber, Lackierroboter, Zerstäuber-Reinigungsgerät und zugehörige Betriebsverfahren |
| FR3103718B1 (fr) | 2019-12-02 | 2021-12-17 | Exel Ind | Projecteur électrostatique rotatif de produit de revêtement et installation de projection comprenant un tel projecteur |
| JP6948487B1 (ja) * | 2021-06-23 | 2021-10-13 | アーベーベー・シュバイツ・アーゲーABB Schweiz AG | 静電塗装装置 |
-
2021
- 2021-09-07 DE DE102021123081.0A patent/DE102021123081A1/de active Pending
-
2022
- 2022-09-01 JP JP2024515094A patent/JP2024531611A/ja active Pending
- 2022-09-01 KR KR1020247007773A patent/KR20240054286A/ko active Pending
- 2022-09-01 EP EP22770006.9A patent/EP4341002A1/de active Pending
- 2022-09-01 MX MX2024002656A patent/MX2024002656A/es unknown
- 2022-09-01 US US18/686,896 patent/US12576414B2/en active Active
- 2022-09-01 CN CN202280051745.3A patent/CN117693399A/zh active Pending
- 2022-09-01 WO PCT/EP2022/074310 patent/WO2023036679A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| US12576414B2 (en) | 2026-03-17 |
| MX2024002656A (es) | 2024-04-15 |
| JP2024531611A (ja) | 2024-08-29 |
| DE102021123081A1 (de) | 2023-03-09 |
| KR20240054286A (ko) | 2024-04-25 |
| US20240390923A1 (en) | 2024-11-28 |
| WO2023036679A1 (de) | 2023-03-16 |
| CN117693399A (zh) | 2024-03-12 |
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