EP0251954A1 - Verfahren und Vorrichtung um eine Mischung aus Zuschlagstoff und Binder am Ende einer Vorrichtung zu entspannen - Google Patents

Verfahren und Vorrichtung um eine Mischung aus Zuschlagstoff und Binder am Ende einer Vorrichtung zu entspannen Download PDF

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Publication number
EP0251954A1
EP0251954A1 EP87420187A EP87420187A EP0251954A1 EP 0251954 A1 EP0251954 A1 EP 0251954A1 EP 87420187 A EP87420187 A EP 87420187A EP 87420187 A EP87420187 A EP 87420187A EP 0251954 A1 EP0251954 A1 EP 0251954A1
Authority
EP
European Patent Office
Prior art keywords
mold
compaction
walls
side walls
stress
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
Application number
EP87420187A
Other languages
English (en)
French (fr)
Other versions
EP0251954B1 (de
Inventor
Benoist Coste
Claude Vanvoren
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.)
Rio Tinto France SAS
Original Assignee
Aluminium Pechiney SA
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 Aluminium Pechiney SA filed Critical Aluminium Pechiney SA
Priority to AT87420187T priority Critical patent/ATE53534T1/de
Publication of EP0251954A1 publication Critical patent/EP0251954A1/de
Application granted granted Critical
Publication of EP0251954B1 publication Critical patent/EP0251954B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/022—Moulds for compacting material in powder, granular of pasta form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/027—Particular press methods or systems

Definitions

  • the invention relates to a method and a device for lateral relaxation of the stresses at the end of oedometric compaction of a block consisting of an aggregate and a binder, shaped by vibrotassage or pounding.
  • carbon blocks consisting of coke and / or anthracite (aggregate) and pitch (binder) intended for electrometallurgy, for example anodes and cathode elements intended for aluminum fabrication tanks by electrolysis.
  • Oedometer compaction of a block or a shaped part by vibrotassage or pounding consists in placing the material to be shaped in a mold provided with a cover, and in imposing one or more stress cycles on it. These constraints are applied by the repeated fall of a mass on the material (pestle or heavy weight cover).
  • the vibrotassage is obtained by the use of a heavy cover and the application, on the mold, of a vibration at a frequency of a few Hertz to a few tens of Hertz, which has the effect of lifting the cover which falls under the effect of its weight, on the block to be compacted.
  • Pounding consists in applying repeated shocks to the block by means of a pestle which is lifted and allowed to fall periodically.
  • Figures 1, 2 and 3 relate to the prior art.
  • Figures 4, 5, 6, 7 and 8 relate to the invention.
  • lateral constraint any constraint exerted in a direction perpendicular or substantially perpendicular to the direction of the vertical constraint.
  • the cover (4) is removed; the material (1) which has stored the lateral stresses will release them.
  • the side walls of the mold (3) being fixed, the stresses can only relax in the direction of the compaction axis and can cause the formation of cracks (6) perpendicular to the compaction axis; this is what happens, for example, during the molding of anodes for the production of aluminum by electrolysis, when the carbonaceous paste, in the mold, exceeds a certain critical temperature.
  • the object of the invention is a method for lateral relaxation of stresses at the end of shaping, by oedometer compaction, of a block consisting of an aggregate and a binder and to which a monoaxial stress is applied in a rigid mold comprising a bottom and four side walls.
  • compacting the operation of shaping blocks in a mold, the terms “bottom” and “top” not prejudging the position of the mold in space.
  • At least two opposite side walls are made mobile so as to be able to move back a few millimeters relative to the molded block (1) but they are firmly held in place for the entire duration of the compaction.
  • Another object of the invention is a device for implementing the compacting process which makes it possible to ensure a limited setback (of a few millimeters) of the mobile walls after compacting, while keeping them firmly locked during the actual compacting. .
  • Figures 4 to 8 show schematically the implementation of the invention in the particular case where the main stress is vertical.
  • Figure 4 shows diagrammatically the compaction under the action of the force Fa exerted by the cover (4) or the piston (s) (4) (4A).
  • the reference (4) designates the cover of a vibrotassage device or a pestle; the reference (4A) designates the fixed bottom of the mold.
  • the movable walls (7 and / or 8) are spaced a few millimeters from the corresponding walls of the molded block, the cover (4) being contrary to the practice of the prior art, held in place on the block (1 ) (fig. 5), which allows lateral stress relaxation.
  • the block is subjected on the part of the cover or of the piston or pistons to a residual stress of 50 to 2000 kPa (kilopascals) and preferably between 100 to 500 kPa.
  • the molded block is released after opening the walls (7) and / or (8) and removing the cover.
  • Figure 8 shows schematically a device for the implementation of the invention.
  • the wall (7) is immobilized, during compaction, by means of the wedge (9) which itself bears on a rigid, fixed upright (8).
  • On the wall (7) are fixed two guide rods (10) terminated by a head (11). Between the head (11) and the external wall of the fixed upright, a spring (12) working in compression has been placed.
  • the wedge (9) is raised by means of the jack (13).
  • the head (11) is pushed outwards, and it pulls on the wall (7) which moves back a few millimeters, thus leaving, between it and the pressed carbon block (1) , a space of a few millimeters sufficient to ensure relaxation of the stresses.
  • This device is only a particular, non-limiting example of the invention, for ensuring the lateral clearance of the wall (7) and keeping it firmly immobilized during compaction.
  • a vibratory compactor was equipped with two movable side walls capable of deviating from the walls of the block by approximately 5 mm, according to the device in FIG. 8.
  • the two doors (8) which are are raised to allow the evacuation of the anode are animated by the same movement of recoil of 5 mm before being raised.
  • the stress relaxation is therefore done in the two directions of the horizontal plane (the main stress having been vertical).
  • Anodes intended for the production of aluminum by electrolysis, according to the Hall-Héroult process, are one of the privileged but not exclusive fields of implementation of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Lubricants (AREA)
  • Nonmetallic Welding Materials (AREA)
  • Saccharide Compounds (AREA)
  • Carbon And Carbon Compounds (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Catalysts (AREA)
  • Ceramic Products (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Processing Of Solid Wastes (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Paper (AREA)
  • Toys (AREA)
  • Ropes Or Cables (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Die Bonding (AREA)
  • Inert Electrodes (AREA)
EP87420187A 1986-07-04 1987-07-01 Verfahren und Vorrichtung um eine Mischung aus Zuschlagstoff und Binder am Ende einer Vorrichtung zu entspannen Expired - Lifetime EP0251954B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87420187T ATE53534T1 (de) 1986-07-04 1987-07-01 Verfahren und vorrichtung um eine mischung aus zuschlagstoff und binder am ende einer vorrichtung zu entspannen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8610128 1986-07-04
FR8610128A FR2600939B1 (fr) 1986-07-04 1986-07-04 Procede et dispositif de relaxation des contraintes en fin de compactage oedometrique d'un melange d'agregat et de liant

Publications (2)

Publication Number Publication Date
EP0251954A1 true EP0251954A1 (de) 1988-01-07
EP0251954B1 EP0251954B1 (de) 1990-06-13

Family

ID=9337341

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87420187A Expired - Lifetime EP0251954B1 (de) 1986-07-04 1987-07-01 Verfahren und Vorrichtung um eine Mischung aus Zuschlagstoff und Binder am Ende einer Vorrichtung zu entspannen

Country Status (17)

Country Link
US (1) US4826419A (de)
EP (1) EP0251954B1 (de)
KR (1) KR880001419A (de)
CN (1) CN1010844B (de)
AT (1) ATE53534T1 (de)
AU (1) AU593662B2 (de)
BR (1) BR8703382A (de)
CA (1) CA1312190C (de)
DE (1) DE3763161D1 (de)
ES (1) ES2015596B3 (de)
FR (1) FR2600939B1 (de)
GR (1) GR3000577T3 (de)
IS (1) IS1395B6 (de)
NO (1) NO170139C (de)
NZ (1) NZ220915A (de)
OA (1) OA08628A (de)
ZA (1) ZA874845B (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2604430B1 (fr) * 1986-09-30 1990-01-05 Pechiney Aluminium Procede et dispositif de mise en forme de blocs carbones par compactage multiaxial
US5007337A (en) * 1989-10-03 1991-04-16 Mosley Machinery Co., Inc. Oversize bale release mechanism for waste material baler
JP3620250B2 (ja) 1997-11-20 2005-02-16 株式会社村田製作所 セラミック積層体のプレス装置及びプレス方法
US7687093B2 (en) * 2003-01-29 2010-03-30 Sfk Systems A/S Method and an apparatus for thawing frozen meat
CN103231540B (zh) * 2013-04-27 2016-08-10 江阴市瑞丰液压机械有限公司 压块机的释放空间结构
CN106739099B (zh) * 2017-01-11 2018-04-13 洛阳理工学院 一种用于生物质对辊挤压成型的成型辊

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR441320A (fr) * 1912-01-30 1912-08-03 Nicola Faraldi Moule articulé pour la production de blocs artificiels pleins ou perforés pour le batiment
US2342772A (en) * 1939-01-09 1944-02-29 Sk Wellman Co Stripping apparatus
FR898723A (fr) * 1943-06-11 1945-05-04 Procédé permettant de mouler des pièces en béton de faible épaisseur et appareil destiné à la mise en oeuvre de ce procédé
DE1175360B (de) * 1959-11-12 1964-08-06 Elektrokohle Lichtenberg Veb Halbstetig arbeitende Elektrodenpresse
FR1478202A (fr) * 1966-05-03 1967-04-21 Elektrokohle Lichtenberg Veb Procédé et dispositif pour fabriquer des corps moulés de charbon et de graphite
DE2039686A1 (de) * 1969-09-19 1971-03-25 Von Roll Ag Vorrichtung zur Herstellung von Bloecken
US4000231A (en) * 1974-09-16 1976-12-28 Hydramet American Inc. Method for compacting powders

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1625129A (en) * 1921-08-01 1927-04-19 C A Straubel Company Apparatus for pressing cheese
FR552861A (fr) * 1921-11-02 1923-05-08 Machine à estampiller les morceaux de savon
US1863609A (en) * 1931-06-19 1932-06-21 Ind Patents Corp Meat mold
US3056653A (en) * 1959-11-18 1962-10-02 Owens Corning Fiberglass Corp Control of crystal growth in mica materials
US4666389A (en) * 1985-01-25 1987-05-19 The Texas A&M University System Apparatus for forming compacts from solid particles

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR441320A (fr) * 1912-01-30 1912-08-03 Nicola Faraldi Moule articulé pour la production de blocs artificiels pleins ou perforés pour le batiment
US2342772A (en) * 1939-01-09 1944-02-29 Sk Wellman Co Stripping apparatus
FR898723A (fr) * 1943-06-11 1945-05-04 Procédé permettant de mouler des pièces en béton de faible épaisseur et appareil destiné à la mise en oeuvre de ce procédé
DE1175360B (de) * 1959-11-12 1964-08-06 Elektrokohle Lichtenberg Veb Halbstetig arbeitende Elektrodenpresse
FR1478202A (fr) * 1966-05-03 1967-04-21 Elektrokohle Lichtenberg Veb Procédé et dispositif pour fabriquer des corps moulés de charbon et de graphite
DE2039686A1 (de) * 1969-09-19 1971-03-25 Von Roll Ag Vorrichtung zur Herstellung von Bloecken
US4000231A (en) * 1974-09-16 1976-12-28 Hydramet American Inc. Method for compacting powders

Also Published As

Publication number Publication date
IS3237A7 (is) 1988-01-05
AU7508287A (en) 1988-01-07
ES2015596B3 (es) 1990-09-01
FR2600939A1 (fr) 1988-01-08
DE3763161D1 (de) 1990-07-19
IS1395B6 (is) 1989-10-31
ZA874845B (en) 1988-03-30
ATE53534T1 (de) 1990-06-15
US4826419A (en) 1989-05-02
KR880001419A (ko) 1988-04-23
AU593662B2 (en) 1990-02-15
CN1010844B (zh) 1990-12-19
BR8703382A (pt) 1988-03-15
OA08628A (fr) 1988-11-30
CA1312190C (fr) 1993-01-05
NO170139C (no) 1992-09-16
NO872782D0 (no) 1987-07-02
EP0251954B1 (de) 1990-06-13
CN87104583A (zh) 1988-01-20
NO170139B (no) 1992-06-09
FR2600939B1 (fr) 1992-01-31
GR3000577T3 (en) 1991-07-31
NO872782L (no) 1988-01-05
NZ220915A (en) 1989-12-21

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