EP1730329A1 - Procede et appareil pour deposer une couche electrogalvanique sur des articles en metal - Google Patents

Procede et appareil pour deposer une couche electrogalvanique sur des articles en metal

Info

Publication number
EP1730329A1
EP1730329A1 EP04722634A EP04722634A EP1730329A1 EP 1730329 A1 EP1730329 A1 EP 1730329A1 EP 04722634 A EP04722634 A EP 04722634A EP 04722634 A EP04722634 A EP 04722634A EP 1730329 A1 EP1730329 A1 EP 1730329A1
Authority
EP
European Patent Office
Prior art keywords
centrifuge
items
treatment
station
stations
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Withdrawn
Application number
EP04722634A
Other languages
German (de)
English (en)
Inventor
Umberto Spina
Walter Lando
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.)
LM Finishing Systems Srl
Glomax Srl
Original Assignee
LM Finishing Systems Srl
Glomax Srl
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 LM Finishing Systems Srl, Glomax Srl filed Critical LM Finishing Systems Srl
Publication of EP1730329A1 publication Critical patent/EP1730329A1/fr
Withdrawn legal-status Critical Current

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
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/16—Apparatus for electrolytic coating of small objects in bulk
    • C25D17/22—Apparatus for electrolytic coating of small objects in bulk having open containers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/16—Apparatus for electrolytic coating of small objects in bulk
    • C25D17/22—Apparatus for electrolytic coating of small objects in bulk having open containers
    • C25D17/24—Oblique barrels

Definitions

  • the present invention relates to processes and apparatuses for the electrolytic deposition of protective coatings on metal items, typically the coating with zinc of screws and the like. Reference will be made hereafter to such an application, while it is clear that what is being said is also applicable to other types of protective and/or decorative coating with other metals and applied to any kind of item. It is known that conventional zinc-coating plants essentially consist of a sequence of operating stations where the screws, loaded into a perforated barrel, undergo the various treatments required to obtain the protective coating through a process well known to those skilled in the art. By way of example, reference will be made to a plant having an operative capacity of 1800 kg/hour of screws, for a zinc-coating 12 ⁇ m thick. Such a plant provides a sequence of phases/stations as follows:
  • transporting the items in the barrel from one station to another implies also carrying a large amount of liquids that have to be purified since the barrel, due to its conformation, causes a very strong carry-over in the passage from one station to another, be it full of items or empty, which makes necessary to use a large amount of washing water and chemical products;
  • the object of the present invention is to provide a process and apparatus which are free from the above-mentioned drawbacks. This object is achieved by means of a process and apparatus that provides the use of centrifuge drums instead of barrels, a treatment phase and the subsequent washing in the same station, as well as the centrifugation of the items prior to the passage to another station or to the successive treatment phase in the same station.
  • a first great advantage of the present invention stems from the fact that rather than moving the items to be treated from one chemical station to another by means of bridge cranes that transport the barrels, they are the items to be treated that remain for several treatment cycles inside the same centrifuge because the liquids are moved, by filling and emptying the apparatus through a hydraulic pumping system.
  • the fact of centrifuging the items between one treatment and another therefore implies a very low consumption of chemical products and water in that, thanks to the centrifugation, they are completely recovered.
  • a second significant advantage is given by the fact that whereas between one phase an another of the known process there are large carry-overs that cause the pollution of the chemical solutions with subsequent necessity for a frequent intervention to restore them, otherwise the treatment is not carried out correctly and this may cause the rejection of the treated items, in the new system all of this is not necessary because thanks to the centrifugation of the items between one chemical phase and another the pollution can not occur. Still another important advantage is the greatly reduced environmental impact and the lower cost of the plant, since it is not required to provide complicated and expensive water and air purification systems given that there are no highly polluting liquids used in the open.
  • the process and apparatus according to the invention allow to obtain the same operative capacity with a plant that requires 70% less liquids and chemical substances, has 50% less stations, with an automatic handling without operator and with a very low environmental impact.
  • Fig.l is a diagrammatic front view of a plant according to the present invention, as in the above-mentioned comparative example;
  • Fig.2 is a diagrammatic top plan view of the plant of fig.l;
  • Fig.3 is a diagrammatic side view of an apparatus corresponding to a station of the plant above;
  • Fig.4 is a diagrammatic front view showing in greater detail the centrifuge of one of the stations provided with a rectifier.
  • a plant according to the present invention consists of a sequence of aligned stations A for the chemical and electrochemical treatments, the latter where rectifiers R are provided, with an automatic loading station L at the inlet and an automatic unloading station U at the outlet, the latter being preceded by two drying stations A'.
  • the items to be treated are contained in perforated cylindrical drums D open at the top (similar to a washing machine drum), and said drums D are automatically moved from one station A to another by means of carriages C that run on rails B extending above the stations along the whole length of the plant, from the loading station L to the unloading station U.
  • FIGS 3 and 4 there are illustrated the members that make up one of the above-mentioned stations A, in particular one of the stations for the electrochemical zinc-coating treatment.
  • a station includes a centrifuge F, closed by a top lid E, wherein a motor M' rotates a drum D that has been vertically introduced into centrifuge F by one of the above-mentioned aerial carriages C.
  • centrifuge F Upon closure, centrifuge F can be inclined to about 45° around an axis X by means of a motor M, while retaining the electrical connection to a rectifier R as well as an hydraulic connection.
  • the treatment liquids are delivered to and drained from centrifuge F through respective delivery G and drain H pipes that converge into an hydraulic connector S extending from the bottom of centrifuge F.
  • the delivery pipe G comes from an upper tank T located on a scaffolding K at an elevated position with respect to centrifuge F, whereas the drain pipe H leads to a lower tank T' located lower than centrifuge F under said scaffolding K.
  • the two tanks T, T' are in turn hydraulically connected with the help of a pump P, that allows to return the recovered and purified liquids from the lower tank T' to the upper tank T.
  • Other piping, pumps and valve means not illustrated are also provided for the delivery and drain of liquids in the two tanks.
  • the main novel aspect of the present process is given by the fact that it is not indispensable to move the items from one station to another to carry out the various phases, since the alternation of the liquids delivered to the centrifuge allows to carry out in the same station more treatments alternating with centrifugations without moving the drum. In theory it would even be possible to concentrate all the phases in a single station, however such an extreme solution would make sense only for an extremely small production that would not justify the cost of a whole multi-station plant.
  • the process typically consists of the following steps: a) introducing the drum containing the items into a centrifuge; b) delivering a first chemical treatment liquid to the centrifuge; c) carrying out the treatment; d) draining said first chemical treatment liquid from the centrifuge; e) carrying out a centrifugation of the items to recover said liquid; f) delivering washing water to the centrifuge; g) carrying out the washing; h) draining the washing water from the centrifuge; i) carrying out a centrifugation of the items to recover said water; j) transferring the drum to another station, or repeating the preceding steps with another chemical treatment liquid. It should be noted that the mere fact of carrying out the washing subsequent to a chemical treatment phase in the same station where the treatment has been carried out already allows to significantly
  • the centrifugation subsequent to every treatment or washing allows to recover the liquids thus reducing the consumption thereof, as well as to prevent the problems of liquid carry-over from one station to another, which also prevents the environmental pollution.
  • the treatment takes place with the centrifuge inclined at about 45°, whereas for the centrifugation it is better to return the drum to the vertical position. Therefore, in such a case, the steps listed above would be supplemented with the inclination of the centrifuge prior to the treatment and to the washing (steps "c" and "g"), as well as with the returning of the centrifuge to the vertical position prior to the centrifugations (steps "e” and "i”).
  • the members making up the apparatus may be replaced by other members that are mechanically equivalent or modified according to specific needs; for example, the shape of the centrifuges and of the corresponding drums may be different, the centrifuges may be inclined at a different angle and/or around an axis that is differently arranged, and so on.
  • the hydraulic circuits that control the flows of liquids to and from a centrifuge may change, for example by providing more tanks and/or more pumps, or a single tank that feeds several centrifuges through valved manifolds and so on.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Centrifugal Separators (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Dans un procédé de l'invention destiné à appliquer une couche électrogalvanique sur des articles métalliques, par une séquence de phases de traitement chimique ou électrochimique, chaque phase de traitement comprend les étapes consistant à: a) introduire le tambour contenant les articles dans une centrifugeuse; b) injecter le premier liquide de traitement chimique dans la centrifugeuse; c) effectuer le traitement; d) drainer le premier liquide de traitement chimique de la centrifugeuse; e) effectuer une centrifugation des articles pour récupérer ledit liquide; f) injecter de l'eau de lavage dans la centrifugeuse; g) effectuer le lavage; h) drainer l'eau de lavage de la centrifugeuse; i) effectuer une centrifugation des articles pour récupérer l'eau; j) transférer le tambour sur un autre poste ou répéter les étapes précédentes avec un autre liquide de traitement chimique. Le fait d'effectuer le lavage après la phase de traitement chimique dans le poste où le traitement a été effectué, permet de réduire considérablement le nombre de postes. De plus, la centrifugation subséquente à chaque traitement ou à chaque lavage permet de récupérer les liquides, ce qui permet de réduire la consommation de ces liquides, ainsi que d'éviter les problèmes de liquide résiduel d'un poste à un autre, ce qui permet de réduire la pollution de l'environnement. L'invention concerne une installation constituant un mode de réalisation de procédé. Cette installation comprend une série de postes alignés (A), dotée d'un poste de chargement automatique, à l'entrée, et d'un poste de déchargement automatique, à la sortie, dans lesquels les articles à traiter sont renfermés dans des tambours cylindriques perforés (D) ouverts au niveau de leur partie supérieure, qui sont automatiquement déplacés d'un poste à un autre au moyen de chariots (C) circulant sur des rails (B) s'étendant au-dessus des postes, tout le long de l'installation. L'utilisation de tambours ouverts (D), au lieu de barils classiques fermés par une porte, permet d'effectuer de manière complètement automatique le chargement et le déchargement des articles dans les postes d'extrémité d'installation, ce qui permet de supprimer les risques sanitaires dont pourraient souffrir les opérateurs, lors d'un tel procédé.
EP04722634A 2004-03-23 2004-03-23 Procede et appareil pour deposer une couche electrogalvanique sur des articles en metal Withdrawn EP1730329A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2004/000145 WO2005090647A1 (fr) 2004-03-23 2004-03-23 Procede et appareil pour deposer une couche electrogalvanique sur des articles en metal

Publications (1)

Publication Number Publication Date
EP1730329A1 true EP1730329A1 (fr) 2006-12-13

Family

ID=34957523

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04722634A Withdrawn EP1730329A1 (fr) 2004-03-23 2004-03-23 Procede et appareil pour deposer une couche electrogalvanique sur des articles en metal

Country Status (9)

Country Link
US (1) US20070246369A1 (fr)
EP (1) EP1730329A1 (fr)
JP (1) JP4505501B2 (fr)
CN (1) CN100564611C (fr)
BR (1) BRPI0418677A (fr)
CA (1) CA2560337C (fr)
HK (1) HK1104325A1 (fr)
MX (1) MXPA06010926A (fr)
WO (1) WO2005090647A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008179872A (ja) * 2006-12-28 2008-08-07 Kida Seiko Kk 表面処理装置
JP5041826B2 (ja) * 2007-02-20 2012-10-03 木田精工株式会社 表面処理装置
JP2015120952A (ja) * 2013-12-21 2015-07-02 睦技研株式会社 めっき装置
CN104073864B (zh) * 2014-07-16 2016-12-07 广东保迪环保电镀设备有限公司 一种滚镀生产线自动卸料装置
CN104451845A (zh) * 2014-11-13 2015-03-25 深圳国宝造币有限公司 一种贵金属币自动化镀膜系统及方法
CN107299370A (zh) * 2017-06-30 2017-10-27 浙江群展精密紧固件股份有限公司 一种倾斜脱水机
CN107470922A (zh) * 2017-08-11 2017-12-15 江苏中伟业通讯设备有限公司 一种天线基站用卡具螺纹连接件生产系统
BE1029998B1 (nl) * 2021-12-08 2023-07-03 Duroc Nv Werkwijze en inrichting voor het verzinken van draadstangen met open trommel

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GB295791A (en) * 1927-06-18 1928-08-23 Canning & Co Ltd W Improvements relating to electro-plating apparatus
DE1621064A1 (de) * 1967-06-21 1971-04-29 Dittmann & Co Carl Verfahren zur galvanischen Oberflaechenveredlung von metallischen Kleinteilen und Galvanisiereinrichtung zur Durchfuehrung des Verfahrens
DE3023405C2 (de) * 1980-06-23 1982-04-08 Siemens AG, 1000 Berlin und 8000 München Vorrichtung und Verfahren zum galvanischen Abscheiden von Aluminium
DE3121397C1 (de) * 1981-05-29 1983-01-13 Alois 5202 Hennef Müller Verfahren zum Oberflächenbeschichten von Kleinteilen aus Metall, Holz oder Kunststoff in einer perforierten Drehtrommel
FR2526448A1 (fr) * 1982-05-10 1983-11-10 Corrand Marcel Dispositif a bains successifs pour traiter des pieces industrielles
DE3230108C2 (de) * 1982-08-13 1986-04-30 WMV Apparatebau GmbH & Co KG, 5227 Windeck Verfahren zum Oberflächenbeschichten von Kleinteilen
DE4419016A1 (de) * 1994-05-31 1995-12-07 Arweiler Armin Schleuder zum Abschleudern von Kleinteilen nach einem Verzinkungsbad
CN1122120C (zh) * 1999-05-25 2003-09-24 谢锐兵 一种滚桶电镀的加工方法及其装置
DE19932524C1 (de) * 1999-07-12 2001-03-29 Wmv App Bau Gmbh & Co Kg Verfahren und Vorrichtung zur elektrochemischen Behandlung
CH694619A5 (de) * 1999-07-12 2005-04-29 Wmv Appbau Gmbh & Co Kg Verfahren und Vorrichtung zur elektrochemischen Behandlung.
JP3436733B2 (ja) * 2000-01-18 2003-08-18 日本テクノ株式会社 液体処理装置、それを用いた滅菌装置、それを用いた洗浄処理方法、表面処理方法および滅菌方法
JP4014827B2 (ja) * 2001-07-25 2007-11-28 シャープ株式会社 メッキ処理装置
JP2003147593A (ja) * 2001-11-13 2003-05-21 Aoyama Seisakusho Co Ltd 篭形バレルと篭形バレルを使用した表面処理装置
DE10161086B4 (de) * 2001-12-12 2005-06-02 Wmv Apparatebau Gmbh & Co Kg Anlage zum Behandeln von Massenteilen
JP3874259B2 (ja) * 2002-03-20 2007-01-31 大日本スクリーン製造株式会社 メッキ液管理装置、それを備えたメッキ装置、およびメッキ液組成調整方法

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Also Published As

Publication number Publication date
CN100564611C (zh) 2009-12-02
MXPA06010926A (es) 2007-03-08
JP4505501B2 (ja) 2010-07-21
JP2007530782A (ja) 2007-11-01
CA2560337C (fr) 2010-11-16
CN1942609A (zh) 2007-04-04
CA2560337A1 (fr) 2005-09-29
US20070246369A1 (en) 2007-10-25
BRPI0418677A (pt) 2007-06-05
HK1104325A1 (en) 2008-01-11
WO2005090647A1 (fr) 2005-09-29

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