EP0627022B1 - Vorrichtung zur elektrolytischen beschichtung von kleinteilen - Google Patents

Vorrichtung zur elektrolytischen beschichtung von kleinteilen Download PDF

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Publication number
EP0627022B1
EP0627022B1 EP93903167A EP93903167A EP0627022B1 EP 0627022 B1 EP0627022 B1 EP 0627022B1 EP 93903167 A EP93903167 A EP 93903167A EP 93903167 A EP93903167 A EP 93903167A EP 0627022 B1 EP0627022 B1 EP 0627022B1
Authority
EP
European Patent Office
Prior art keywords
pipe
tube
conveyor
region
basin
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
Application number
EP93903167A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0627022A1 (de
Inventor
Hans Belz
Burkard Flamme
Werner Schauf
Hans Günter ENGELS
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.)
Ewald Doerken AG
Original Assignee
Ewald Doerken AG
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 Ewald Doerken AG filed Critical Ewald Doerken AG
Publication of EP0627022A1 publication Critical patent/EP0627022A1/de
Application granted granted Critical
Publication of EP0627022B1 publication Critical patent/EP0627022B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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, the bath with 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 and the device consists of a screw conveyor with loading and unloading openings at its ends and with screw conveyors in the inside of the conveyor tube, which has electrically conductive contacts on the inside of its conveyor tube are connected to one pole of the direct current source, and the screw conveyor is inserted with a part of its cross section into a plunge pool which is connected to the other pole.
  • 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 device consists of a screw conveyor with loading and unload
  • 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 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 operation for coating such small parts is very complex, since the drum must first be filled with small parts and then the coated or electrocoated small parts must be removed from the drum again. In the prior art, only a discontinuous mode of operation is possible, so that the number of lacquered small parts applied per unit of time is narrowly limited.
  • a device for electrolytic coating according to the preamble of claim 1 is known from EP-A-0141 406 and in particular from US-A-19 12 400.
  • 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 plunge pool be arranged below the front end of the tube in the conveying direction and extend from an area located at a distance in front of the small-parts feed opening to a portion, in particular approximately half, of the length of the tube, wherein the front edge and the side edges of the plunge pool form the coating agent weir edge, which is formed in the conveying direction of the weir rear edge by a region of the conveyor screw, the smallest distance from the deepest point of the tube is at least equal to the weir line in line, preferably protrudes beyond this line of alignment, which protrudes in the conveying direction the edge of the immersion basin lying at the back lies sealingly against the outer wall of the pipe in the area of the screw conveyor forming the rear weir edge, the pipe having a coating agent outlet in the area following in the conveying direction.
  • This design makes it possible to paint small metallic parts in a continuous, continuous process by means of electro-dipping, a high material throughput being possible with low personnel expenditure.
  • the small parts can be fed to the screw conveyor with a conventional conveyor.
  • the finished coated small parts can also be removed by means of a conveyor device 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 conveying tube, the circumferential tube of which is the small-part support member and has a band screw attached to the inner circumference as a pushing member, the open ends of the conveying tube forming the small-part feed and the small-part discharge opening.
  • Such screw conveyors are also known per se in the prior art.
  • the advantage of this screw conveyor is that no internal bearings are provided and also due to the fixed arrangement of the belt screw on the rotating tube, there is no jamming or clogging of the material to be conveyed. It is also advantageous that the delivery and delivery of the material to be conveyed can take place at the pipe ends.
  • suitable conveying means for feeding and discharging can be arranged upstream or downstream of the conveying pipe.
  • 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.
  • 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 can also be drawn off by means of the coating agent feed pump.
  • 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.
  • the tube is made of plastic or other electrical, non-conductive material, in which 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 on the outside of the tube and / 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.
  • This arrangement creates an extremely functional device, the contact pins protruding from the tube wall like a mushroom head being continuously cleaned by means of the continuously supplied small parts to be coated, so that a good contact transition between these contact pins and the small parts is made possible.
  • 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 current 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 immersion basin cuts the cross section of the tube 2 in a secant manner in its lower region.
  • the screw conveyor is designed as a conveying 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 dip 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 deepest point of the tube (in the drawing figures 1 and 2 below) can be equal to the line of alignment of the weir edge, but preferably, as shown in the exemplary embodiment, via this line of alignment, which is indicated by the fill level 5, protrudes.
  • the edge 10 of the immersion basin 4 lying at the rear in the conveying direction lies in a sealed manner (area 11) on the outer wall of the tube 2, specifically in the area of the screw belt (9) forming the rear weir edge.
  • the pipe 2 has a coating agent drain 12 in the area following this area in the conveying direction.
  • the height of the belt screw 6 is in the range from the small part feed opening (left in the drawing FIG. 1) to the area (9) forming the rear weir edge is lower than the level height 5 in the tube 2 determined by the weir.
  • the tube 2 is perforated at least in the peripheral region immediately following in the conveying direction of the rear edge 10 of the immersion basin 4, 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 an outlet opening located at the deepest point of the drain basin 14, while the outlet of which is connected via a connecting line 17 to a spray device 18 which leads into the front opening 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 located 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.
  • 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.
  • 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. In doing so, 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.
  • the small parts are then delivered to the delivery opening of the tube, for example placed on a downstream conveyor.
  • the device according to the invention is extremely compact and very functional, a high throughput of parts to be coated being possible with a short dwell time and with the help of a small number of operating personnel.
  • the diameter of the tube is 1 meter.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Coating Apparatus (AREA)
  • Thermistors And Varistors (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Secondary Cells (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP93903167A 1992-02-25 1993-02-10 Vorrichtung zur elektrolytischen beschichtung von kleinteilen Expired - Lifetime EP0627022B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4205672A DE4205672C2 (de) 1992-02-25 1992-02-25 Vorrichtung zur elektrolytischen Beschichtung von Kleinteilen
DE4205672 1992-02-25
PCT/DE1993/000122 WO1993017155A1 (de) 1992-02-25 1993-02-10 Vorrichtung zur elektrolytischen beschichtung von kleinteilen

Publications (2)

Publication Number Publication Date
EP0627022A1 EP0627022A1 (de) 1994-12-07
EP0627022B1 true EP0627022B1 (de) 1996-02-07

Family

ID=6452484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93903167A Expired - Lifetime EP0627022B1 (de) 1992-02-25 1993-02-10 Vorrichtung zur elektrolytischen beschichtung von kleinteilen

Country Status (13)

Country Link
US (1) US5433834A (ja)
EP (1) EP0627022B1 (ja)
JP (1) JP2613173B2 (ja)
KR (1) KR100212875B1 (ja)
AT (1) ATE134000T1 (ja)
AU (1) AU663924B2 (ja)
CA (1) CA2124082C (ja)
CZ (1) CZ282864B6 (ja)
DE (3) DE4205672C2 (ja)
DK (1) DK0627022T3 (ja)
ES (1) ES2083279T3 (ja)
HU (1) HU216495B (ja)
WO (1) WO1993017155A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19623962C2 (de) * 1996-06-15 2002-11-07 Doerken Ewald Ag Elektrotauchlack für metallische Schüttgüter

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4341188C2 (de) * 1993-12-03 1998-07-09 Nuetro Maschinen & Anlagen Vorrichtung und Verfahren zum Elektrotauchlackieren
DE19511900C2 (de) * 1995-03-31 1997-04-24 Hentschel Michael Dipl Ing Fh Vorrichtung zum Elektro-Tauchlackieren
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 (de) * 1999-02-23 2000-03-16 Doerken Ewald Ag Vorrichtung zur Elektrotauchlackierung
US6228230B1 (en) * 1999-04-19 2001-05-08 Aem, Inc. Electroplating apparatus
DE10011865C1 (de) * 2000-03-10 2001-06-07 Wilms Gmbh Einrichtung zur Beschichtung von Gegenständen, insbesondere Galvanisierung von Kleinteilen
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
US20060051511A1 (en) * 2004-08-13 2006-03-09 Orosz Gary R Apparatus and systems for coating objects
DE102006012103A1 (de) 2006-03-14 2007-09-20 Ewald Dörken Ag Verfahren zum Beschichten von Werkstücken und Vorrichtung hierfür
DE102007018887A1 (de) * 2007-04-19 2008-10-23 Ewald Dörken Ag Trommel und Verfahren zum Beschichten von Werkstücken mit einer nicht-metallischen Beschichtung
US20110000793A1 (en) * 2008-02-26 2011-01-06 Ewald Doerken Ag Coating method for a workpiece
JP6350272B2 (ja) * 2014-12-26 2018-07-04 株式会社デンソー 表面処理装置及び表面処理方法
KR101730250B1 (ko) 2015-08-27 2017-04-26 주식회사 코모텍 열가소성 플라스틱 파이프의 연결 방법

Family Cites Families (11)

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US1912400A (en) * 1930-05-31 1933-06-06 Mercil Plating Equipment Compa Electroplating apparatus
NL62329C (ja) * 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 (de) * 1952-01-13 1955-04-18 Paul Anke Vorrichtung zum Galvanisieren kleiner Teile
US3682136A (en) * 1971-03-04 1972-08-08 Armco Steel Corp Conveyor for electropainting
FR2308705A1 (fr) * 1975-04-22 1976-11-19 Hertschuh A Mecarex Sa Dispositif d'electrolyse pour le traitement de pieces en continu
SE7701371L (sv) * 1977-02-08 1978-08-09 Loqvist Kaj Ragnar Pletering av hal
FR2446871A1 (fr) * 1979-01-17 1980-08-14 Rymland Robert Appareil de traitement electrolytique et installation d'electrolyse mettant en oeuvre au moins un tel appareil
US4559122A (en) * 1983-11-07 1985-12-17 Luciano Folco Continuous-cycle electroplating plant
DK0431711T3 (da) * 1989-11-16 1993-12-13 Plm Berlin Dosenwerk Gmbh Fremgangsmåde og indretning til anodisk eller katodisk elektrolakering af huldele, specielt af dåser

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19623962C2 (de) * 1996-06-15 2002-11-07 Doerken Ewald Ag Elektrotauchlack für metallische Schüttgüter
DE19623962C5 (de) * 1996-06-15 2005-12-01 Ewald Dörken Ag Verwendung von Einkomponenten-Elektrotauchlacken zur Beschichtung von metallischen, elektrisch leitfähigen Schüttgütern in einer kontinuierlichen Durchlauf-Beschichtungsvorrichtung
DE19655362B4 (de) * 1996-06-15 2009-08-20 Ewald Dörken Ag Verwendung eines unverdünnten 2-Komponenten Elektrotauchlackes für metallische Schüttgüter

Also Published As

Publication number Publication date
WO1993017155A1 (de) 1993-09-02
DE4205672C2 (de) 1995-04-20
DE59301602D1 (de) 1996-03-21
CZ282864B6 (cs) 1997-11-12
DK0627022T3 (da) 1996-04-09
HU9401403D0 (en) 1994-08-29
JPH07503500A (ja) 1995-04-13
CA2124082C (en) 1999-08-03
HU216495B (hu) 1999-07-28
EP0627022A1 (de) 1994-12-07
HUT68104A (en) 1995-05-29
ATE134000T1 (de) 1996-02-15
AU3448393A (en) 1993-09-13
KR100212875B1 (ko) 1999-08-02
JP2613173B2 (ja) 1997-05-21
DE4205672A1 (de) 1993-08-26
ES2083279T3 (es) 1996-04-01
US5433834A (en) 1995-07-18
CA2124082A1 (en) 1993-09-02
AU663924B2 (en) 1995-10-26
DE4390620D2 (de) 1996-01-11
CZ204394A3 (en) 1995-06-14

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