EP0025418B1 - Meissel für eine Einschlagvorrichtung und Verfahren zu dessen Betrieb - Google Patents

Meissel für eine Einschlagvorrichtung und Verfahren zu dessen Betrieb Download PDF

Info

Publication number
EP0025418B1
EP0025418B1 EP80810285A EP80810285A EP0025418B1 EP 0025418 B1 EP0025418 B1 EP 0025418B1 EP 80810285 A EP80810285 A EP 80810285A EP 80810285 A EP80810285 A EP 80810285A EP 0025418 B1 EP0025418 B1 EP 0025418B1
Authority
EP
European Patent Office
Prior art keywords
chisel
crust
projections
side surfaces
projection
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
Application number
EP80810285A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0025418A1 (de
Inventor
Edwin Gut
Erwin Arnold
Hans Friedli
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.)
Alcan Holdings Switzerland AG
Original Assignee
Schweizerische Aluminium 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 Schweizerische Aluminium AG filed Critical Schweizerische Aluminium AG
Priority to AT80810285T priority Critical patent/ATE2551T1/de
Publication of EP0025418A1 publication Critical patent/EP0025418A1/de
Application granted granted Critical
Publication of EP0025418B1 publication Critical patent/EP0025418B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/14—Devices for feeding or crust breaking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/02—Percussive tool bits

Definitions

  • the present invention relates to a chisel for an impact device for breaking the solidified crust of an electrolysis furnace, in particular for the production of aluminum, and to a method for operating the chisel.
  • the electrolyte becomes poor in aluminum oxide.
  • aluminum oxide in the electrolyte there is an anode effect, which results in a voltage increase of, for example, 4-4.5 V to 30 V and above.
  • the crust must be hammered in and the aluminum oxide concentration increased by adding new aluminum oxide (alumina).
  • the cell is usually operated periodically in normal operation, even if there is no anode effect.
  • the bath crust has to be hammered in and the alumina concentration increased by adding new aluminum oxide, which corresponds to cell operation.
  • the lower region of the chisel, which directly engages with the crust when the crust is hammered in, in these known devices is designed, for example, as an end face arranged vertically to the side faces, a conical tip or a truncated cone-shaped constriction.
  • the European patent application 0 025 417 describes chisel shapes suitable for punching or shearing off.
  • AT-B-280 626 describes a chisel with a hole for introducing compressed air into the melt flow of the electrolytic cell.
  • a large amount of alumina should be able to be injected into the bath of the electrolytic cell.
  • the chisel according to this embodiment has widenings in the form of side crushing vanes attached near the tip.
  • these relatively large crushing wings require a high impact force and also have a disadvantageous effect on other cell manipulations because of their bulkiness.
  • the inventors have therefore set themselves the task of creating a device for hammering in the solidified crust of an electrolysis furnace and a method for its operation, which ensure continuous, continuous operation without jamming.
  • At least one cam is arranged in the lower region of the vertical chisel side surfaces, which comprises at least part of the chisel circumference, is rectangular in cross section, preferably square, and 5 to 15 mm from the chisel side surfaces protrudes.
  • Such a cam is expediently of elongated shape and extends, arranged horizontally, over at least part of the circumference of the chisel.
  • two or more cams can also be arranged in superimposed levels to be orderly; their distance from the bottom of the chisel and their distance from one another can be varied depending on the cell geometry.
  • the cams are preferably made of the same material as the chisel, in particular a hard and weldable steel, e.g. B. St 45-50. Using a suitable fastening method, such as welding or screwing, preformed cams can be fixed on the vertical side surfaces of the chisel. The cams can also be applied in the form of welding beads and brought into the final shape using a suitable machining process. Furthermore, chisel and cam can be formed in one piece by z. B. be milled out.
  • the cam cross sections are generally rectangular, preferably square and often have a slight undercut on the underside.
  • cams that protrude too far from the chisel are exposed to the risk of deformation, cams that protrude too little are not effective enough. Therefore the cams protrude 5-15 mm from the side of the chisel.
  • the solution according to the invention is characterized in that the chisel according to the invention with at least one cam arranged in the lower region of the vertical side surfaces after the crust has been pierced, at least until the lower half is reached in relation to the thickness of the crust the lowest cam is further lowered.
  • the impact device which consists in principle of a pressure cylinder, piston rod and chisel, is attached directly or indirectly to the cell structure or is part of an operating vehicle or furnace manipulator.
  • the lower area of the chisel 10 is immersed in the liquid melt 14, that is to say it has completely penetrated the solidified melt 16.
  • This lower area is shown in the shape of a fishtail. Although this shape is used to advantage, any other suitable shape of the lower portion of the bit can be used.
  • the lower pair of cams 12 arranged on the narrow side has almost completely penetrated the crust 16.
  • An almost continuous space 18 has been created between the chisel 10 and the solidified melt 16.
  • the alumina 20 lying on the crust 16 trickles into this gap.
  • the chisel 10 does not jam and can easily be pulled out again after being pushed in.
  • the furnace which takes place after a short time interval in automatic systems, the chisel can be inserted into the hole widened by the clearing function of the cams without difficulty. If the chisel is not exactly centered, it pushes away the lugs 17 of the solidified melt flow 16 left over from the last operating process without any problems and without great force.
  • additional cams can be arranged on the wider side surfaces of the chisel.
  • the chisel can also be pressed down more, then the lower pair of cams 12 completely pierce the crust.
  • the side surface of the cams facing the bath or the chisel side which have a cross-sectional dimension of approximately 1 cm 2 , is undercut, preferably with an undercut angle of up to 20 °. Through this end face, which is inclined upwards in the direction of the chisel, the cams act in the sense of clearing teeth.
  • crust fragments and alumina pushed into the molten electrolyte from the underside of the chisel are not shown.
  • a chisel 22 which is round in cross section is shown.
  • the cone-shaped lower area of the chisel can assume any other suitable shape.
  • a lower pair of cams 24 encompasses the largest Most part of the chisel circumference, as can be seen in particular from FIG. 4, a horizontal section through FIG.
  • a pair of cams 26 arranged in an overlying plane only comprises a relatively small part of the circumference of the chisel.
  • 1-4 cams are shown, which are characterized by their elongated shape and their horizontal course by the same width, Fig. Shows a section of a longitudinal section through a chisel with cams of different widths.
  • the lowest cam 30, which first acts on the solidified melt flow, is narrow, the cam 32 arranged above it is wider and the cam 34 arranged uppermost is widest.
  • the space created between the chisel and the crust is gradually expanded from bottom to top when the impact device is actuated.
  • the cams according to the invention can still be fastened in the lower region of the chisel in many design variants which have the same function and achieve the same result.
  • the lowermost part of the chisel which carries or forms the cams can also be designed as an interchangeable unit which is detachably attached to the chisel shaft. This embodiment has the advantage that after a certain amount of wear or in the event of a repair, not the entire chisel, but only its lowermost part, has to be replaced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Disintegrating Or Milling (AREA)
  • Organic Insulating Materials (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Crushing And Grinding (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Immobilizing And Processing Of Enzymes And Microorganisms (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Hybrid Cells (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Primary Cells (AREA)
EP80810285A 1979-09-10 1980-09-09 Meissel für eine Einschlagvorrichtung und Verfahren zu dessen Betrieb Expired EP0025418B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80810285T ATE2551T1 (de) 1979-09-10 1980-09-09 Meissel fuer eine einschlagvorrichtung und verfahren zu dessen betrieb.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH8151/79 1979-09-10
CH815179 1979-09-10

Publications (2)

Publication Number Publication Date
EP0025418A1 EP0025418A1 (de) 1981-03-18
EP0025418B1 true EP0025418B1 (de) 1983-02-16

Family

ID=4335944

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80810285A Expired EP0025418B1 (de) 1979-09-10 1980-09-09 Meissel für eine Einschlagvorrichtung und Verfahren zu dessen Betrieb

Country Status (14)

Country Link
US (2) US4317595A (enrdf_load_stackoverflow)
EP (1) EP0025418B1 (enrdf_load_stackoverflow)
JP (1) JPS5647582A (enrdf_load_stackoverflow)
AT (1) ATE2551T1 (enrdf_load_stackoverflow)
AU (1) AU539612B2 (enrdf_load_stackoverflow)
CA (1) CA1150189A (enrdf_load_stackoverflow)
DE (1) DE2943291C2 (enrdf_load_stackoverflow)
ES (1) ES8106768A1 (enrdf_load_stackoverflow)
GR (1) GR69698B (enrdf_load_stackoverflow)
IS (1) IS1151B6 (enrdf_load_stackoverflow)
NO (1) NO154173C (enrdf_load_stackoverflow)
NZ (1) NZ194874A (enrdf_load_stackoverflow)
YU (1) YU231080A (enrdf_load_stackoverflow)
ZA (1) ZA805336B (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH644156A5 (de) * 1979-09-10 1984-07-13 Alusuisse Vorrichtung zur bedienung von elektrolyseoefen.
CN102011149B (zh) * 2010-12-23 2015-12-02 高伟 流入推压式氧化铝加料装置
EP3278931A1 (de) * 2016-08-02 2018-02-07 HILTI Aktiengesellschaft Flachmeissel

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR615512A (enrdf_load_stackoverflow) * 1927-01-10
US1614287A (en) * 1920-07-17 1927-01-11 Rembrandt Peale Mining machine
AT237909B (de) * 1962-12-07 1965-01-11 Vmw Ranshofen Berndorf Ag Elektropneumatische Vorrichtung zur automatischen periodischen Tonerdezugabe bei Aluminiumelektrolyseöfen
CH496100A (de) * 1967-04-07 1970-09-15 Alusuisse Verfahren und Vorrichtung zum Betreiben eines Ofens für die schmelzelektrolytische Gewinnung von Aluminium

Also Published As

Publication number Publication date
ES494888A0 (es) 1981-09-01
DE2943291A1 (de) 1981-04-02
ZA805336B (en) 1981-09-30
IS1151B6 (is) 1984-03-05
NO154173C (no) 1986-08-06
JPS5647582A (en) 1981-04-30
GR69698B (enrdf_load_stackoverflow) 1982-07-08
US4317595A (en) 1982-03-02
CA1150189A (en) 1983-07-19
DE2943291C2 (de) 1983-02-10
US4380492A (en) 1983-04-19
NO154173B (no) 1986-04-21
ES8106768A1 (es) 1981-09-01
EP0025418A1 (de) 1981-03-18
ATE2551T1 (de) 1983-03-15
IS2583A7 (is) 1981-03-11
YU231080A (en) 1983-06-30
NO802645L (no) 1981-03-11
NZ194874A (en) 1984-12-14
AU539612B2 (en) 1984-10-11
AU6211180A (en) 1981-03-19

Similar Documents

Publication Publication Date Title
DE3227441A1 (de) Verfahren und vorrichtung zum entfernen der elektrolyt-rueckstaende von verbrauchten vorgebrannten anoden bei der aluminium-schmelzflusselektrolyse
DE1273266B (de) Bohrspitze fuer selbstbohrende Schrauben sowie Vorrichtung und Verfahren zur Herstellung derselben
EP0025418B1 (de) Meissel für eine Einschlagvorrichtung und Verfahren zu dessen Betrieb
DE2631673B2 (de) Kathodenelement fuer elektrolysezellen, insbesondere zur aluminiumelektrolyse
EP0025416B1 (de) Einschlagvorrichtung für einen Elektrolyseofen
DE2633055C2 (de) Elektrolysezelle zur Herstellung von Aluminium
EP0025417B1 (de) Einschlagvorrichtung zum Brechen der erstarrten kruste eines Elektrolyseofens
DE1783018A1 (de) Verfahren und Anlage zum Entfernen von an ihrer Halterung haftenden Kohlebloecken und zum nachfolgenden Zerbroeckeln dieser Bloecke
EP0671988B1 (de) Verfahren zum herstellen einer siebplatte für einen brennelement-fuss und entsprechendes brennelement
DE2838733C2 (de) Profilstahlschere und/oder -stanze
DE102013001918B4 (de) Verfahren zur Herstellung eines Sacklochs in einem metallischen Körper sowie Verwendung eines derartigen Verfahrens
CH633048A5 (de) Verfahren und vorrichtung zur herstellung von aluminium.
DE2003339B2 (de) Vorrichtung zur speisung der blasoeffnungen im boden eines stahlkonverters
DE102018003622A1 (de) Vorrichtung und Verfahren zum Heraustrennen eines Werkstücks
DE202018002305U1 (de) Vorrichtung zum Heraustrennen eines Werkstücks
EP0643635B1 (de) Gegenmesser
DE2656795B2 (de) Schlagwerkzeug zum Einsetzen in einen Abbau- bzw. Aufbruchhammer
DE68903339T2 (de) Verfahren und vorrichtung zur reinigung von gebrauchten anoden.
DE102007024711B4 (de) Vorrichtung und Verfahren zum Clinchen von Bauteilen
DE102011085627A1 (de) Elektrodeneinheit für elektrohydraulischen umformprozess
DE1608232A1 (de) Verfahren und Vorrichtung zum Betreiben eines Ofens fuer die schmelzelektrolytische Gewinnung von Aluminium
DE1608232C3 (de) Verfahren und Vorrichtung zum Betreiben eines Ofens für die schmelzelektrolytische Gewinnung von Aluminium
CH657383A5 (de) Elektrolysewanne zur herstellung von aluminium mittels schmelzflusselektrolyse und verfahren zum einsetzen der eisenbarren.
DE1192600B (de) Vorrichtung zum Einschlagen von Naegeln
DE2353746C3 (de) Brecher für Schrottstücke aus sprödem Metall

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT CH DE FR GB IT NL SE

17P Request for examination filed

Effective date: 19810129

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT CH FR GB IT LI NL SE

REF Corresponds to:

Ref document number: 2551

Country of ref document: AT

Date of ref document: 19830315

Kind code of ref document: T

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19840808

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19840823

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19840930

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19860819

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19860930

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19870909

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19870910

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19870930

Ref country code: CH

Effective date: 19870930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19880401

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19880531

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee
REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19881118

EUG Se: european patent has lapsed

Ref document number: 80810285.9

Effective date: 19880906

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT