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EP0436528B1 - Dispositif d'electropolissage de surfaces - Google Patents

Dispositif d'electropolissage de surfaces Download PDF

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Publication number
EP0436528B1
EP0436528B1 EP88908666A EP88908666A EP0436528B1 EP 0436528 B1 EP0436528 B1 EP 0436528B1 EP 88908666 A EP88908666 A EP 88908666A EP 88908666 A EP88908666 A EP 88908666A EP 0436528 B1 EP0436528 B1 EP 0436528B1
Authority
EP
European Patent Office
Prior art keywords
housing
outer housing
electropolished
electrode
several
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
EP88908666A
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German (de)
English (en)
Other versions
EP0436528A1 (fr
Inventor
Robert Weber
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP0436528A1 publication Critical patent/EP0436528A1/fr
Application granted granted Critical
Publication of EP0436528B1 publication Critical patent/EP0436528B1/fr
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
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/001—Decontamination of contaminated objects, apparatus, clothes, food; Preventing contamination thereof
    • G21F9/002—Decontamination of the surface of objects with chemical or electrochemical processes
    • G21F9/004—Decontamination of the surface of objects with chemical or electrochemical processes of metallic surfaces

Definitions

  • the invention relates to a device for electropolishing surfaces with a housing which can be guided along the surface to be electropolished by means of a guide device, with the exception of the housing which is closed on all sides, with a seal between the edge of the housing and the surface to be electropolished, with a electrode held in the housing and with auxiliary devices connected to the housing for power supply and for supplying electrolyte fluid.
  • this sponge-like electrode is enclosed by a housing that is only open towards the surface to be decontaminated and can be brought into contact with the surface to be decontaminated by means of a seal, small amounts of electrolyte liquid adhere to the already decontaminated surface sections when the housing is moved. These electrolyte residues adhering to the decontaminated surface parts interfere with the recommissioning of the decontaminated system parts. They must therefore be eliminated beforehand by extensive rinsing measures.
  • the invention is based on the object of strengthening this device for electropolishing surfaces to such an extent that as far as possible no electrolyte residues get caught on the surface parts to be decontaminated or their amount is significantly reduced.
  • the housing together with the electrode is installed inside an outer housing, which is closed on all sides, with the exception of the side facing the surface to be electropolished, the outer housing carrying a seal at its edge and with connections for the supply and discharge to a rinsing liquid as well as with bushings for the supply and discharge of electrolyte liquid from and to the inner housing, it becomes possible to dilute the electrolyte residues remaining on the electropolished surface between the two housings with rinsing liquid and to rinse them away when the two housings are electropolished and moved. At the same time, pre-cleaning of the surface parts that are subsequently to be electropolished is also achieved.
  • the inner housing is slidably mounted relative to the outer housing perpendicular to the open side of the two housings.
  • the sponge electrode, together with the inner housing can be pushed further towards the surface to be electropolished and better brought into contact with the surface if the wall is strongly curved.
  • the flexible housing seal compensates for the straight edge of the housing and the curvature of the container wall. In this way, the risk of leakage at the seals can be reduced even on curved surfaces.
  • the electrode can also be slidably mounted in the interior of the inner housing perpendicular to the open side thereof. This makes it possible to keep the contact pressure of the electrode approximately constant with different curvatures of the surface to be electropolished.
  • the contamination of the electropolished surface parts with electrolyte is minimized if deionate is used as the rinsing liquid in nuclear plants in a particularly advantageous embodiment of the invention.
  • the rinsing liquid or the deionized residues that remain on the electropolished surface can be mixed with the deionate that is usually used in the operation of such systems, and further treatment or rinsing of the surface becomes superfluous.
  • Particularly low residues of electrolyte are achieved if, in a particularly advantageous embodiment of the invention, a ring line connected to the rinsing liquid supply line and equipped with spray nozzles aligned with the gap between the edges of the inner and outer housing is fastened to the outer housing, between the outer and inner housing .
  • the electrolyte residues are rinsed out of the surface by the spray pressure of the rinsing liquid, diluted and suctioned off with the rinsing liquid.
  • FIG. 1 shows in cross section a container 2 to be decontaminated, on which a work platform 4 is placed, which carries a central opening 6.
  • a rotary table 12 which can be rotated about the axis of symmetry 10 of the container 2 on the work platform 4, is mounted over this opening with rollers 8, 9 (only two shown).
  • a central main mast 14 is guided on the turntable so as to be displaceable perpendicular to the plane of the table. The vertical displacement of the main mast 14 takes place via an indicated vertical drive 16 with a pinion 20 engaging in a rack 18 of the main mast.
  • the rotation of the main mast 14 about the axis of symmetry 10 of the container 2 takes place via a horizontal drive 22 attached to the edge of the turntable 12 with an in a ring gear 26 of the work platform 4 engaging pinion 24.
  • a manipulator arm 28 is pivotally mounted about a horizontal axis 30. The pivoting position of the manipulator arm is adjusted by means of a cable drive 32.
  • the outer housing 34 of the device for electropolishing surfaces is fastened to a support arm 36 which can be displaced longitudinally on the manipulator arm 28.
  • a deionized tank 38 At the lower end of the central main mast 14, a deionized tank 38, an electrolyte tank 40 and a circulation pump 41, 42 for the deionized water and the electrolyte liquid are attached.
  • a circulation pump 41, 42 for the deionized water and the electrolyte liquid are attached.
  • television cameras 44, 45 and a lighting device 46 are attached.
  • FIG. 2 enlarged compared to FIG. 1, one can see the outer housing 34 with all its internals, which is held on the manipulator arm 28 by means of the support arm 36.
  • This outer housing 24 has a cylindrical plan and is closed on all sides except for the side opposite the support arm 36.
  • the edge of this outer housing 34 carries a seal 50.
  • a plunger 54 is mounted so as to be longitudinally displaceable.
  • a sponge electrode 56 is pivotally supported in two dimensions by means of a ball joint 58.
  • a somewhat smaller inner housing 60 is mounted so as to be longitudinally displaceable on the stamp 54.
  • This inner housing 60 is likewise closed on all sides, with the exception of the side facing the surface to be electropolished.
  • it likewise has a cylindrical cross section and is supported on the inner wall of the outer housing 34 with a largely open annular bead 61.
  • a circumferential seal 62 is also attached to the edge of the inner housing 60 and can be brought into engagement with the surface 48 to be electropolished.
  • the inner housing 60 and also the stamp with the sponge electrode 54 are pressed out of the outer housing 60 in the direction of the surface 48 to be electropolished by means of a spring 64 placed on the stamp 54 and supported on the one hand on the inner housing 60 and on the other hand on the outer housing 34 .
  • a further spring 68 is clamped between the outer housing 34 and the manipulator arm 28 and pushes the outer housing 34 away from the manipulator arm.
  • the plunger 54 is at the same time the piston rod of a hydraulic cylinder 70 installed in the interior of the manipulator arm 28.
  • the plunger 54 can thus be pulled into the manipulator arm 28 against the force of the springs 64, 68 or also pushed out again.
  • the disk 66 attached to the stamp transmits the retraction movement of the stamp 54 to the two housings 34, 60 by abutment on the inner housing 60.
  • the support arm 36 which is welded to the outer housing 34, is in turn slidably displaceable over the manipulator arm 28. The travel of the support arm 36 on the manipulator arm 28 is limited by a stop pin 74 of the support arm, which plunges into a longitudinal groove 72 of the manipulator arm.
  • the sponge 76 of the sponge electrode 56 is connected to the electrolyte circulation pump 42 via two pipelines 78, 79 for the supply of electrolyte liquid which are passed through the rear wall of both the inner and the outer housing.
  • the inner housing is also connected to the electrolyte container 40 via at least one pipe 80, 81 which is led through the rear wall of the outer housing 34 for the suction of electrolyte liquid.
  • the outer housing 34 carries on its inside a ring line 82 with spray nozzles 84, 85 aligned with the electropolishing surface 48, which is connected to the flushing liquid pump 41 via a flushing liquid supply line 86.
  • the outer housing 34 is connected to a suction line 88 for rinsing liquid. This suction line opens into the rinsing liquid container 38, which is filled with deionized water in the exemplary embodiment.
  • the central main mast 14 is first lowered to the desired height by means of the vertical drive 16 and then the manipulator arm 28 is moved into the working position via the cable drive 32, ie in the exemplary embodiment into the horizontal position, pivoted.
  • the sponge electrode 56, the inner housing 60 and the outer housing 34 can be pressed by the springs 64, 68 against the surface to be electropolished, ie in the exemplary embodiment against the inner wall 48 of the container 2.
  • the outer housing 34 is pressed with its seal 45 against the outer housing and on the manipulator arm 28 with its seal 45 and the container wall.
  • the inner housing is pressed by the spring 64 stretched between the inner housing and the outer housing with its seal 62 against the container wall 48.
  • the hydraulic cylinder 70 can additionally press the stamp 54 with the sponge electrode 56 against the container wall to be electropolished.
  • the sponge electrode 56 can be supplied with electrolyte liquid via the pipes 78, 79 and that of the electrolyte circulation pump 42.
  • the excess electrolyte is sucked back out of the inner housing 60 into the electrolyte container via the suction lines 80, 81.
  • rinsing liquid in the exemplary embodiment deionized water, is pressed with the circulating pump 41 from the deionized water tank 38 into the ring line 82 and through the spray nozzles 84, 85 (only two shown).
  • the deionized water that accumulates in the outer container is sucked back into the rinsing liquid container 38 via the suction line 88.
  • the removed deionate can either be replaced by fresh deionate or the removed deionate can be worked up before being returned to the rinsing liquid container. It is also conceivable that between the inner and the outer housing rotating brushes are installed, which on the surface to be electropolished to brush. As a result, electrolyte parts adhering to the surface and residues of removed material are mechanically wiped away.
  • the outer housing 34 can alternatively also be completely flooded with deionized water. It is also possible to keep the pressure in the outer housing 34 slightly above the pressure in the inner housing 6D and thereby effectively prevent electrolyte from leaking from the inner housing.
  • this pressure difference enables the lip seals to be pressed more firmly.
  • This also applies to the inner lip seal 62, if - in contrast to the exemplary embodiment - it is designed similarly to the outer lip seal 50 with one inner lip and one outer lip.
  • This device effectively prevents electrolyte liquid from escaping through the seal 62 of the inner housing 60 and through the seal 50 of the outer housing 34. It is a great advantage of this device that not only the electrolyte residues still adhering after electropolishing are washed away, but that when the device is moved over the surface to be electropolished, a pre-cleaning of the area in which electropolishing is to take place subsequently can also be achieved.
  • This device for electropolishing makes it possible to work under water due to its construction. This possibility of being able to work under water is of great advantage, particularly in the case of nuclear facilities, because it can effectively reduce the radiation exposure in the area. Finally, the work progress can be continuously monitored via the television cameras 44, 45 fastened under the work platform 4 and at the lower end of the main mast 14.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Food Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
  • Cleaning In General (AREA)

Abstract

Un dispositif d'électropolissage de surfaces comprend un logement (60) fermé de tous les côtés, à l'exception du côté qui fait face à la surface à polir électriquement. Le logement peut être déplacé le long de la surface à polir (48) par un dispositif de guidage (4, 12, 14, 28). Une garniture d'étanchéité (62) est agencée entre le bord du logement et la surface à polir. Une électrode (56) est assujettie au logement et des accessoires (41, 42) d'alimentation en courant et en un électrolyte fluide sont raccordés au logement. Pour réduire autant que possible les résidus d'électrolyte sur la surface polie, le logement (60) est monté avec l'électrode (56) à l'intérieur d'un logement extérieur (34) fermé de tous les côtés, à l'exception du côté qui fait face à la surface à polir. Le logement extérieur comprend sur son bord une garniture d'étanchéité (50) et il est pourvu de raccords (86, 88) d'amenée et d'évacuation d'un fluide de rinçage, ainsi que de passages pour l'amenée de l'électrolyte fluide jusqu'au logement intérieur (60) et pour l'évacuation de l'électrolyte fluide du logement intérieur (60). Les résidus d'électrolyte qui restent sur des parties des surfaces polies sont ainsi emportés directement derrière le logement intérieur. Le dispositif décrit est particulièrement utile pour polir électriquement les parois internes de récipients, de canalisations et d'autres parties d'installations des industries chimique et nucléaire.

Claims (11)

  1. Dispositif d'électropolissage de surfaces comprenant un boîtier (60) qui peut être guidé au moyen d'un dispositif de guidage (4, 12, 14, 28) le long de la surface à électropolir, et qui est fermé de tous côtés, à l'exception du côté tourné vers la surface à électropolir, une garniture d'étanchéité (62) entre le bord du boîtier et la surface à électropolir, une électrode (56) maintenue dans le boîtier et des dispositifs auxiliaires (41, 42) raccordés au boîtier et d'alimentation en courant électrique et d'alimentation en électrolyte liquide, caractérisé en ce que le boîtier (60) est monté en même temps que l'électrode (56) à l'intérieur d'un boîtier (34) extérieur fermé de tous côtés, à l'exception du côté tourné vers la surface à électropolir, le boîtier extérieur portant sur son bord une garniture d'étanchéité (50) et étant muni de raccords (86, 88) pour amener et évacuer un liquide de lavage, ainsi que de traversées pour amener de l'électrolyte liquide du boîtier intérieur et l'évacuer vers le boîtier intérieur.
  2. Dispositif suivant la revendication 1, caractérisé en ce que le boîtier (60) intérieur est monté coulissant par rapport au boîtier (34) extérieur, perpendiculairement au côté ouvert des deux boîtiers.
  3. Dispositif suivant la revendication 1 ou 2, caractérisé en ce que l'électrode (56) est montée coulissante à l'intérieur du boîtier (60) intérieur perpendiculairement au côté ouvert de celui-ci.
  4. Dispositif suivant l'une ou plusieurs des revendications précédentes, caractérisé en ce que le liquide de lavage est de l'eau désionisée.
  5. Dispositif suivant l'une ou plusieurs des revendications précédentes, caractérisé en ce qu'un conduit annulaire (82), raccordé au conduit d'amenée (86) du liquide de lavage et muni de buses de projection (84, 85) dirigées sur l'intervalle compris entre les bords du boîtier intérieur et du boîtier extérieur, est fixé au boîtier (34) extérieur entre le boîtier extérieur et le boîtier intérieur.
  6. Dispositif suivant l'une ou plusieurs des revendications précédentes, caractérisé en ce qu'il est prévu, dans l'intervalle compris entre le boîtier extérieur et le boîtier intérieur, des brosses tournantes ou oscillantes frottant sur la surface à électropolir.
  7. Dispositif suivant l'une ou plusieurs des revendications précédentes, caractérisé par l'utilisation d'une électrode poreuse (56).
  8. Dispositif suivant l'une ou plusieurs des revendications précédentes, caractérisé par l'utilisation de garnitures d'étanchéité (50, 62) à lèvres très souples.
  9. Dispositif suivant l'une ou plusieurs des revendications précédentes, caractérisé en ce que le dispositif de guidage pour électropolir la surface intérieure de cuves comprend un mât principal (14) central ayant un bras manipulateur (28) monté basculant à son extrémité inférieure, le boîtier (34) extérieur coulissant à l'extrémité extérieure du bras manipulateur (28) dans la direction longitudinale de celui-ci et étant monté tournant en même temps que le bras manipulateur, par rapport à l'axe de symétrie (10) de la cuve (2).
  10. Dispositif suivant la revendication 9, caractérisé en ce que le mât principal (14) central peut tourner, par rapport à un axe vertical, au moyen d'un plateau tournant (12).
  11. Dispositif suivant la revendication 9 ou 10, caractérisé en ce que les réservoirs (38, 40) d'électrolyte liquide et de liquide de lavage, ainsi que les pompes d'alimentation (41, 42) correspondantes sont disposés à l'extrémité inférieure du mât principal (14).
EP88908666A 1988-10-10 1988-10-10 Dispositif d'electropolissage de surfaces Expired - Lifetime EP0436528B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE1988/000626 WO1990004053A1 (fr) 1988-10-10 1988-10-10 Dispositif d'electropolissage de surfaces

Publications (2)

Publication Number Publication Date
EP0436528A1 EP0436528A1 (fr) 1991-07-17
EP0436528B1 true EP0436528B1 (fr) 1993-02-24

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EP88908666A Expired - Lifetime EP0436528B1 (fr) 1988-10-10 1988-10-10 Dispositif d'electropolissage de surfaces

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EP (1) EP0436528B1 (fr)
DE (1) DE3878697D1 (fr)
WO (1) WO1990004053A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001032960A3 (fr) * 1999-11-04 2001-10-18 Edk Res Ag Machine de nettoyage localise a cellule electrolytique et/ou ultrasonore, destinee au decapage et/ou au polissage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6017722A (en) 1991-04-04 2000-01-25 Board Of Regents, The University Of Texas System Luminous bacteria and methods for the isolation, identification and quantitation of toxicants
GB2319259A (en) * 1996-11-15 1998-05-20 Babcock Rosyth Defence Limited reducing radionucleide contamination of a metallic component

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3370175A (en) * 1965-01-28 1968-02-20 North American Rockwell Toxicant detector
DE2841896A1 (de) * 1977-09-28 1979-03-29 Beckman Instruments Inc Verfahren zum nachweis einer toxischen substanz
US4581335A (en) * 1982-12-01 1986-04-08 Texas A&M University System Process for producing a cloned luciferase-synthesizing microorganism
WO1988000617A1 (fr) * 1986-07-22 1988-01-28 Boyce Thompson Institute For Plant Research Utilisation de genes structuraux de luciferase bacterienne pour le clonage et le controle de l'expression genetique dans des microorganismes et pour le marquage et l'identification d'organisme modifies par genie genetique

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3345278A1 (de) * 1983-12-14 1985-06-27 Kraftwerk Union AG, 4330 Mülheim Vorrichtung zum elektropolieren der innenoberflaeche von hohlzylindrischen koerpern

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3370175A (en) * 1965-01-28 1968-02-20 North American Rockwell Toxicant detector
DE2841896A1 (de) * 1977-09-28 1979-03-29 Beckman Instruments Inc Verfahren zum nachweis einer toxischen substanz
US4581335A (en) * 1982-12-01 1986-04-08 Texas A&M University System Process for producing a cloned luciferase-synthesizing microorganism
WO1988000617A1 (fr) * 1986-07-22 1988-01-28 Boyce Thompson Institute For Plant Research Utilisation de genes structuraux de luciferase bacterienne pour le clonage et le controle de l'expression genetique dans des microorganismes et pour le marquage et l'identification d'organisme modifies par genie genetique

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Dialog information services, File 55, BIOSIS, BIOSIS number 84024973, Leemans R et al: "A broad-host-range expression vector based on the p1 promoter of coliphage lambda regulated synthesis of human interleukin 2 in erwini and serratia species", J Bacteriol 169 (5), 1987, 1899-1904 *
Diog Information Services, File 55, BIOSIS, BIOSIS number 81081249, Lastick S M et al: "Overproduction of escherichia.coli xylose isomerase", Biotechnol Lett 8 (1), 1986, 1-6 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001032960A3 (fr) * 1999-11-04 2001-10-18 Edk Res Ag Machine de nettoyage localise a cellule electrolytique et/ou ultrasonore, destinee au decapage et/ou au polissage
US7803258B2 (en) 1999-11-04 2010-09-28 Edk Research Ag Machine for localized cleaning with an electrolytic cell, for pickling and/or polishing metal surfaces

Also Published As

Publication number Publication date
EP0436528A1 (fr) 1991-07-17
DE3878697D1 (de) 1993-04-01
WO1990004053A1 (fr) 1990-04-19

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