EP0627022A1 - Device for the electrolytic coating of small parts. - Google Patents
Device for the electrolytic coating of small parts.Info
- Publication number
- EP0627022A1 EP0627022A1 EP93903167A EP93903167A EP0627022A1 EP 0627022 A1 EP0627022 A1 EP 0627022A1 EP 93903167 A EP93903167 A EP 93903167A EP 93903167 A EP93903167 A EP 93903167A EP 0627022 A1 EP0627022 A1 EP 0627022A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- area
- pipe
- coating agent
- screw
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/22—Servicing or operating apparatus or multistep processes
Definitions
- the invention relates to a device for the electrolytic coating of small parts with electrical conductivity, in particular metal parts, the device comprising a bath of electrically conductive liquid coating agent and the bath with the one pole of a direct current source (cathode or anode) is in electrically conductive connection, while the Good to be coated is in electrically conductive connection with the other pole (anode or cathode) of the direct current source.
- a direct current source cathode or anode
- the Good to be coated is in electrically conductive connection with the other pole (anode or cathode) of the direct current source.
- the so-called electrocoating is carried out with known devices, the coating agent being deposited cathodically or anodically on small metallic parts.
- a device which consists of a closed drum into which the small metallic parts are filled.
- the coating agent is also introduced into the drum, the drum being electrically conductive in the interior and being connected to one pole of a power source, while the coating agent is connected to the other pole of a power source.
- the small metal parts assume the potential of the drum, so that the coating agent is deposited on the small parts with the opposite electrical potential.
- the work process for coating such small parts is very complex since the drum is initially used
- the invention has for its object to provide a device of the generic type, which enables a high throughput of small metallic parts for the purpose of dip painting with little effort.
- the device consists of a screw conveyor which has electrically conductive contacts on the inside of its conveyor tube, which are connected to the one pole of the direct current source, and that the screw conveyor is inserted with a part of its cross section into an immersion bath which is connected to the other pole.
- the small parts can be fed to the screw conveyor with a conventional conveyor
- the finished coated small parts can also be arranged downstream of the screw conveyor
- Such screw conveyors are known per se in the prior art, a belt screw in the form of a helically wound belt being rotatably mounted in a stationary tube, by means of which the throughput of small parts is made possible.
- the screw conveyor is designed as a conveyor tube, the circumferential tube of which is the small-part support element and has a band screw attached to the inner circumference as a push element, the open ends of the conveyor tube forming the small-part feed and the small-part discharge opening.
- suitable conveying means for feeding and discharging can be arranged upstream or downstream of the conveying pipe.
- the plunge pool is arranged below the front end of the pipe in the conveying direction and is separated from one another by a distance in front of the small parts feed opening area extends over a part, in particular about half, of the length of the tube, the front edge and the side edge of the plunge pool forming the coating agent weir edge, which is formed in the conveying direction rear weir edge by an area of the belt screw, the smallest distance from which The deepest point of the pipe is equal to the line of alignment of the weir edges, preferably protruding beyond this line of alignment, the edge of the plunge pool lying at the back in the conveying direction sealing against the
- the outer tube wall lies in the area of the screw belt forming the rear weir edge, the tube in this area following in the conveying direction
- Coating process can be supplied by suitable means.
- the height of the belt screw in the area from the small part feed opening to the area forming the rear weir edge is lower than the level height in the tube determined by the weir. This also enables a sufficient level of the coating agent to be achieved within the tube so that the small parts can be coated evenly and completely.
- the tube is perforated at least in the circumferential area immediately following in the conveying direction of the rear edge of the immersion basin, preferably also in the coating zone located in front of it in the conveying direction.
- the perforation of the tube in the circumferential area immediately following in the conveying direction of the rear edge of the plunge pool ensures that the coating agent can flow off and drip off there, so that the coated small parts can be discharged at the discharge end of the tube without excess coating agent.
- the perforation of the tube in this area is also beneficial and advantageous.
- a collecting basin is arranged below the immersion basin and below the perforated area of the tube.
- Excess coating agent which emerges at the perforation zone of the tube following the coating zone can be collected by this collecting basin, as can coating agent, which runs over the front and side weir edge of the plunge pool.
- the device comprises a coating agent feed pump, the inlet of which is connected to the collecting basin and the outlet of which leads into the immersion basin or, preferably, to a spray device which is inserted into the front pipe mouth and is aimed at the coating zone of the pipe.
- the collecting basin preferably has a shape which leads to a collection of the coating agent at a low point, at which point the coating agent by means of the
- Coating agent feed pump can be removed.
- the coating agent can then be reintroduced into the coating zone or into the immersion tank by the pump in order to use it for further coating Z u.
- the tube is made of plastic or other electrical, non-conductive material, in the area from the mouth to the end of the coating zone is interspersed with button-like contact pins which protrude from the tube wall on the inside of the tube and in the circumferential direction and on the outside of the tube / or are connected to one another in the axial direction by externally electrically insulated contact rails, the Contact rails are guided to a circumferential busbar attached to the outside of the pipe near the pipe end, which is connected to a pole of the power source via sliding or rolling contacts.
- a further preferred embodiment is seen in the fact that the device is held in a frame which also holds bearing rollers for the tube and a drive motor for the tube, the drive motor being coupled to a drive pinion which engages with a ring gear attached to the outside of the tube stands.
- the other pole of the power source is connected to a contact plate which forms the second electrode and which is arranged below the tube in the plunge pool.
- the device for electrolytic coating (electrodeposition) of small parts with electrical conductivity, in particular metal parts consists of a screw conveyor, generally designated 1, which has on the inside of its conveyor tube 2 electrically conductive contacts 3, which are connected to one pole of the DC power source, not shown in the drawing are.
- the screw conveyor 1 dips with a part of its cross-section into a plunge pool 4, which is connected to the other pole.
- the level 5 of the screw conveyor 1 dips with a part of its cross-section into a plunge pool 4, which is connected to the other pole.
- the screw conveyor is designed as a conveyor tube 2, the circumferential tube 2 of which is the small-part support member, and has a belt screw 6 attached to the inner circumference as a pushing member for the small parts.
- the open ends of the conveyor tube 2 form the small-part feed opening (on the left in the figure 1) and the small-part discharge opening (on the right in the figure 1).
- the plunge pool 4 is arranged below the front end of the tube 2 in the conveying direction and extends from an area located at a distance in front of the small parts feed opening to approximately over half the length of the tube 2.
- the front edge 7 and the side edge 8 of the plunge pool form 4 a weir edge for the coating agent.
- the weir edge at the rear in the conveying direction is formed by an area of the belt screw, the smallest distance from the lowest point of the pipe (in the drawing figure
- the height of the belt screw 6 is in the range from the small part feed opening (left in the drawing in FIG. 1) to the area (9) forming the rear weir edge is lower than the level height 5 in the pipe 2 determined by the weir.
- the tube 2 is at least in
- the direction of conveyance of the rear edge 10 of the immersion basin 4 is perforated immediately following the peripheral region, but preferably also in the coating zone located in front of it in the conveying direction.
- the perforation is indicated at 13.
- a collecting basin 14 is arranged below the immersion basin 4 and below the perforated area 13 of the tube 2.
- the device has a coating agent feed pump 15, the input of which is connected via a line 16 to a drain opening located at the deepest point of the drain basin 14, while the outlet thereof is connected via a connecting line 17 to a spray device 18 which is connected to the front Mouth of the tube 2 is used and aims in the coating zone of the tube 2.
- the tube 2 is preferably made of plastic. In the area from the mouth to the end of the coating zone, the tube 2 is penetrated by button-like contact pins 3 which protrude from the tube wall on the inside of the tube like a mushroom head and are connected to one another in the circumferential direction and / or in the axial direction on the outside of the tube by contact rails 19 which are electrically insulated from the outside are.
- the contact rails 19 are guided to a circumferential busbar 20 which is fastened to the outside of the casing near the pipe end and which is guided by grinding or Roller contacts 21 are connected to a pole of the power source.
- This pole can form the cathode, for example, so that the contact pins 3 have corresponding potential.
- the other pole of the power source is connected to a contact plate 22 which forms the second electrode (in the example, the anode) and which is arranged below the tube 2 in the immersion pool 4 and thus brings the coating agent to the appropriate potential.
- the perforation 13 is formed in the region of the entire coating zone ensures that the coating agent is well flooded.
- a uniform current flow to the parts to be coated is achieved, and in addition a short path is formed for the current flow from the contact plate 22 through the perforation 13 to the workpieces to be coated, as regards the electrical power to be applied is advantageous.
- This arrangement results in a uniform workpiece coating with a relatively low output.
- the entire device is held in a frame 23 and placed on the floor 24.
- the frame comprises bearing rollers 25 for the tube 2 and a drive motor 26 for the rotary drive of the tube 2, the drive motor 26 being coupled to a drive pinion 27 which is in engagement with a ring gear 28 fastened to the outside of the tube 2.
- a drive motor 26 for the rotary drive of the tube 2
- the drive motor 26 being coupled to a drive pinion 27 which is in engagement with a ring gear 28 fastened to the outside of the tube 2.
- For electrolytic coating that is first Plunge pool 4 filled so that the fill level 5 is set. Subsequently, small parts can then be filled into the tube 2 through the filling opening, which small parts are then conveyed through the tube 2 due to the belt screw 6. They inevitably pass through the zone provided with the coating agent, whereby they are brought to the corresponding electrical potential by contacting the contacts 3, while the coating agent has the opposite potential.
- the coating takes place at a relatively high voltage and low current, for example at 50 amperes and 220 to 250 volts.
- the coating time is about 4 seconds.
- the coated small parts then pass through the zone of the tube which follows the higher belt area 9 and in which excess coating agent can run through the perforation 13 of the tube 2 and can collect in the collecting container 14. Below are the small parts on the
- Dispensing opening of the tube is released, for example placed on a downstream conveyor.
- the inventive apparatus is very compact U nd very functional, wherein a high throughput is made possible by parts to be coated with a low residence time and with the help of little operator.
- the invention is not limited to the exemplary embodiment, but is variable in many ways within the scope of the disclosure.
- the diameter of the tube is 1 meter.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4205672A DE4205672C2 (en) | 1992-02-25 | 1992-02-25 | Device for the electrolytic coating of small parts |
DE4205672 | 1992-02-25 | ||
PCT/DE1993/000122 WO1993017155A1 (en) | 1992-02-25 | 1993-02-10 | Device for the electrolytic coating of small parts |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0627022A1 true EP0627022A1 (en) | 1994-12-07 |
EP0627022B1 EP0627022B1 (en) | 1996-02-07 |
Family
ID=6452484
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93903167A Expired - Lifetime EP0627022B1 (en) | 1992-02-25 | 1993-02-10 | Device for the electrolytic coating of small parts |
Country Status (13)
Country | Link |
---|---|
US (1) | US5433834A (en) |
EP (1) | EP0627022B1 (en) |
JP (1) | JP2613173B2 (en) |
KR (1) | KR100212875B1 (en) |
AT (1) | ATE134000T1 (en) |
AU (1) | AU663924B2 (en) |
CA (1) | CA2124082C (en) |
CZ (1) | CZ282864B6 (en) |
DE (3) | DE4205672C2 (en) |
DK (1) | DK0627022T3 (en) |
ES (1) | ES2083279T3 (en) |
HU (1) | HU216495B (en) |
WO (1) | WO1993017155A1 (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4341188C2 (en) * | 1993-12-03 | 1998-07-09 | Nuetro Maschinen & Anlagen | Device and method for electrocoating |
DE19511900C2 (en) * | 1995-03-31 | 1997-04-24 | Hentschel Michael Dipl Ing Fh | Device for electro-dip painting |
DE19655362B4 (en) * | 1996-06-15 | 2009-08-20 | Ewald Dörken Ag | Use of undiluted 2-component electrocoating for metallic bulk solids |
US5755948A (en) * | 1997-01-23 | 1998-05-26 | Hardwood Line Manufacturing Co. | Electroplating system and process |
US5851368A (en) * | 1997-03-14 | 1998-12-22 | Rumph; Timothy P. | Small parts plating apparatus |
US5945594A (en) * | 1998-10-14 | 1999-08-31 | Meritor Light Vehicle Systems-France | Method and apparatus for the electrochemical inspection of galvanized cable and method and apparatus for predicting the corrosion life of galvanized cable undergoing mechanical fatigue |
DE19907863C1 (en) * | 1999-02-23 | 2000-03-16 | Doerken Ewald Ag | Apparatus for electro dip lacquering comprises a second electrode which is located in the basin below a predetermined level of the dipping liquid |
US6228230B1 (en) * | 1999-04-19 | 2001-05-08 | Aem, Inc. | Electroplating apparatus |
DE10011865C1 (en) * | 2000-03-10 | 2001-06-07 | Wilms Gmbh | Apparatus for coating objects, e.g. galvanizing screws, comprises guides to convey objects to be coated through drum so that each object is electrically contacted with section of drum not wetted with electrolytic liquid |
US20030052009A1 (en) * | 2001-09-14 | 2003-03-20 | Case Leo L. | Method and apparatus for the bulk coating of components |
US6887363B2 (en) * | 2001-11-20 | 2005-05-03 | Sst Corporation | Grounding system for rotating fixtures in electrically conductive mediums |
US7767070B2 (en) * | 2004-08-13 | 2010-08-03 | Ppg Industries Ohio, Inc. | Processes for coating of objects |
DE102006012103A1 (en) | 2006-03-14 | 2007-09-20 | Ewald Dörken Ag | Process for coating workpieces and apparatus therefor |
DE102007018887A1 (en) * | 2007-04-19 | 2008-10-23 | Ewald Dörken Ag | Drum and method for coating workpieces with a non-metallic coating |
ATE531835T1 (en) | 2008-02-26 | 2011-11-15 | Doerken Ewald Ag | COATING PROCESS FOR A WORKPIECE |
JP6350272B2 (en) * | 2014-12-26 | 2018-07-04 | 株式会社デンソー | Surface treatment apparatus and surface treatment method |
KR101730250B1 (en) | 2015-08-27 | 2017-04-26 | 주식회사 코모텍 | Method for connecting thermoplastic pipe |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1912400A (en) * | 1930-05-31 | 1933-06-06 | Mercil Plating Equipment Compa | Electroplating apparatus |
NL62329C (en) * | 1944-07-15 | |||
US2624728A (en) * | 1949-07-14 | 1953-01-06 | United Chromium Inc | Electroplating barrel |
GB675680A (en) * | 1949-11-28 | 1952-07-16 | Canning & Co Ltd W | Improvements relating to rotary electroplating barrels |
DE926403C (en) * | 1952-01-13 | 1955-04-18 | Paul Anke | Device for electroplating small parts |
US3682136A (en) * | 1971-03-04 | 1972-08-08 | Armco Steel Corp | Conveyor for electropainting |
FR2308705A1 (en) * | 1975-04-22 | 1976-11-19 | Hertschuh A Mecarex Sa | Continuous electroplating unit - with rotating insulating polygonal drum suspended on pivotable bearings in an electrolyte through with current supply rings and adoe bar |
SE7701371L (en) * | 1977-02-08 | 1978-08-08 | Loqvist Kaj Ragnar | PLATING OF HALE |
FR2446871A1 (en) * | 1979-01-17 | 1980-08-14 | Rymland Robert | Electrolytic treatment vat - has rotatable cylinder with concentric squirrel-cage cathode and bar anode rotating with cylinder |
US4559122A (en) * | 1983-11-07 | 1985-12-17 | Luciano Folco | Continuous-cycle electroplating plant |
CA2030033C (en) * | 1989-11-16 | 1997-06-24 | Karsten Loeck | Process and a device for anodic or cathodic electro-coating of hollow bodies, particularly cans |
-
1992
- 1992-02-25 DE DE4205672A patent/DE4205672C2/en not_active Expired - Lifetime
-
1993
- 1993-02-10 DE DE59301602T patent/DE59301602D1/en not_active Expired - Lifetime
- 1993-02-10 DE DE4390620T patent/DE4390620D2/en not_active Expired - Fee Related
- 1993-02-10 AU AU34483/93A patent/AU663924B2/en not_active Expired
- 1993-02-10 AT AT93903167T patent/ATE134000T1/en active
- 1993-02-10 WO PCT/DE1993/000122 patent/WO1993017155A1/en active IP Right Grant
- 1993-02-10 JP JP5514439A patent/JP2613173B2/en not_active Expired - Lifetime
- 1993-02-10 DK DK93903167.0T patent/DK0627022T3/en active
- 1993-02-10 CZ CZ942043A patent/CZ282864B6/en not_active IP Right Cessation
- 1993-02-10 EP EP93903167A patent/EP0627022B1/en not_active Expired - Lifetime
- 1993-02-10 US US08/211,469 patent/US5433834A/en not_active Expired - Lifetime
- 1993-02-10 HU HU9401403A patent/HU216495B/en unknown
- 1993-02-10 CA CA002124082A patent/CA2124082C/en not_active Expired - Lifetime
- 1993-02-10 ES ES93903167T patent/ES2083279T3/en not_active Expired - Lifetime
- 1993-09-02 KR KR1019940701244A patent/KR100212875B1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9317155A1 * |
Also Published As
Publication number | Publication date |
---|---|
HU216495B (en) | 1999-07-28 |
CA2124082A1 (en) | 1993-09-02 |
ATE134000T1 (en) | 1996-02-15 |
KR100212875B1 (en) | 1999-08-02 |
US5433834A (en) | 1995-07-18 |
DK0627022T3 (en) | 1996-04-09 |
AU3448393A (en) | 1993-09-13 |
CZ204394A3 (en) | 1995-06-14 |
AU663924B2 (en) | 1995-10-26 |
DE59301602D1 (en) | 1996-03-21 |
JPH07503500A (en) | 1995-04-13 |
CZ282864B6 (en) | 1997-11-12 |
EP0627022B1 (en) | 1996-02-07 |
DE4390620D2 (en) | 1996-01-11 |
ES2083279T3 (en) | 1996-04-01 |
CA2124082C (en) | 1999-08-03 |
HUT68104A (en) | 1995-05-29 |
DE4205672A1 (en) | 1993-08-26 |
JP2613173B2 (en) | 1997-05-21 |
WO1993017155A1 (en) | 1993-09-02 |
HU9401403D0 (en) | 1994-08-29 |
DE4205672C2 (en) | 1995-04-20 |
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