WO2004079227A1 - Actuator for displacing an anode frame of an electrolysis cell for the production of aluminium - Google Patents

Actuator for displacing an anode frame of an electrolysis cell for the production of aluminium Download PDF

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Publication number
WO2004079227A1
WO2004079227A1 PCT/FR2004/000429 FR2004000429W WO2004079227A1 WO 2004079227 A1 WO2004079227 A1 WO 2004079227A1 FR 2004000429 W FR2004000429 W FR 2004000429W WO 2004079227 A1 WO2004079227 A1 WO 2004079227A1
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WO
WIPO (PCT)
Prior art keywords
cylinder
drive
drive wheel
axis
jack
Prior art date
Application number
PCT/FR2004/000429
Other languages
French (fr)
Inventor
Alain Van Acker
Alain Fernandez De Grado
Original Assignee
E.C.L.
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 E.C.L. filed Critical E.C.L.
Priority to US10/542,353 priority Critical patent/US20060137972A1/en
Priority to CA002517148A priority patent/CA2517148A1/en
Priority to BRPI0407920-5A priority patent/BRPI0407920A/en
Priority to EP04714820A priority patent/EP1597494A1/en
Priority to AU2004217776A priority patent/AU2004217776A1/en
Publication of WO2004079227A1 publication Critical patent/WO2004079227A1/en
Priority to IS7988A priority patent/IS7988A/en

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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
    • C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
    • C25C3/10—External supporting frames or structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H2025/2062—Arrangements for driving the actuator
    • F16H2025/209—Arrangements for driving the actuator using worm gears

Definitions

  • the invention relates to the production of aluminum by igneous electrolysis according to the Hall-Héroult process. It relates more particularly to the devices for fixing and moving the anodes of the electrolysis cells intended for the production of aluminum.
  • Aluminum metal is produced industrially by igneous electrolysis, namely by electrolysis of alumina in solution in a bath of molten cryolite, called electrolyte bath, according to the well-known Hall-Héroult process.
  • the electrolyte bath is contained in cells, called “electrolysis cells”, comprising a steel box, which is coated internally with refractory and / or insulating materials, and a cathode assembly located at the bottom of the cell.
  • Anodes typically made of carbonaceous material, are fixed to a superstructure provided with means for moving them vertically during the electrolysis process.
  • the assembly formed by an electrolysis tank, its anodes and the electrolyte bath is called an electrolysis cell.
  • the present invention relates more particularly to fastening and displacement devices comprising fixed structural elements, a frame - called an anode frame - intended for simultaneously lifting or lowering the anodes fixed to said frame and means for moving said frame comprising one or more cylinders.
  • French patents FR 1,440,005 (corresponding to American patent US 4,410,786) and FR 2,517,704 (corresponding to American patent US 4,465,578) describe such devices.
  • electrolysis cells of increasingly higher nominal intensity, as well as the increase in the intensity of existing electrolysis cells lead to an increase in the assemblies formed by an anode frame and anodes fixed to that -this. This weighting requires cylinders capable of developing increasingly greater powers in order to allow the displacement of said assemblies in a satisfactory manner.
  • the Applicant has therefore sought actuators capable of developing high forces, capable of fitting into the limited and congested spaces of the superstructures of electrolysis cells, and able to operate near high intensity electrolysis cells.
  • the subject of the invention is a jack comprising a sheath provided with an opening, an actuating rod comprising an axial cavity and a thread and capable of moving in said opening, a drive screw inserted in said axial cavity and suitable to cooperate with said thread so as to cause the displacement of said rod in the sheath and in said opening, a toothed drive wheel coupled to the drive screw, and an endless screw capable of being connected to the shaft d '' a motor and to cooperate with the drive wheel so as to drive its rotation, and characterized in that the distance E between the axis R of the drive wheel and the axis V of the worm is between 100 and 350 mm, and in that the reduction ratio RR between the worm and the drive wheel is between 300: 1 and 80: 1.
  • the Applicant has found that it is possible to design a cylinder capable of simultaneously achieving relatively high powers and tensile forces, while being capable of occupying a relatively limited volume, thanks to the combination of the characteristics of the cylinder according to the 'invention.
  • the invention also makes it possible to obtain an irreversible jack, that is to say a jack whose actuating rod moves little under load, which avoids the use of an integrated brake.
  • the jack according to the invention is very particularly suitable for moving the anode frames of the electrolysis cells intended for the production of aluminum.
  • FIG. 1 illustrates a typical truncated electrolysis cell and seen in perspective.
  • FIG. 2 illustrates, in perspective view, a typical superstructure of an electrolysis cell.
  • FIG. 3 illustrates a jack according to the invention, seen in longitudinal section.
  • FIG. 4 illustrates a jack according to the invention, seen in cross section along the plane C-C of FIG. 3.
  • the electrolysis cells (1) of a plant for the production of aluminum by igneous electrolysis include a tank (2), capable of containing the liquid metal and the electrolyte bath, a superstructure (10) and a series of anodes (3).
  • the superstructure (10) comprises a fixed gantry (11) and a movable metallic anode frame (12).
  • the anodes (3) are provided with a metal rod (4) intended for fixing and electrical connection of the anodes (3) to the anode frame (12).
  • the superstructure (10) also comprises at least one jack (100, 100 ') coupled to the anode frame (12) by connecting rods (20, 21, 22, 21', 22 ') and levers (30, 31, 32, 33, 34, 31 ', 32', 33 ', 34').
  • the anode frame (12) is moved vertically (up or down) under the action of the jack (s) (100, 100 ').
  • the jack (100, 100 ') comprises:
  • an actuating rod (140) comprising an axial cavity (141) and a thread (142) and able to move in said opening (121), - a drive screw (130) inserted in said axial cavity (141 ) and able to cooperate with said thread (142) so as to cause displacement of said rod (140) in said sheath (120) and in said opening (121),
  • a worm (160) adapted to be connected to the shaft (210) of a drive motor (200) and to cooperate with the drive wheel (150) so as to cause its rotation, and is characterized in that the distance E between the axis R of the drive wheel (150) and the axis V of the worm (160) is between 100 and 350 mm, and in that the ratio of RR reduction between the worm (160) and the drive wheel (150) is between 300: 1 and 80: 1.
  • the reduction ratio RR is given by the ratio between the number of revolutions made by the worm (160) around its axis V when the drive wheel (150) makes a complete revolution around its axis A. In other words, the reduction ratio RR is given by the number of teeth of the drive wheel (150).
  • variable parameters come from at least three coupling levels, namely a first level between the shaft (210) of the drive motor (200) and the worm (160), a second level between the worm (160) and the drive wheel (150) and a third level between the drive wheel (150) and the actuating rod (140).
  • Variable parameters also come from relationships which connect the powers in play (notably the input, internal and output powers), the speeds - linear and angular - desired and acceptable, reduction ratios and thread pitches.
  • additional variable parameters come from the efficiency coefficients of the gears and the mechanical characteristics of the possible materials.
  • a center distance smaller than 100 mm would make it difficult to obtain the reduction in speed required for the drive screw (130) or would require inserting an additional speed reduction stage between the motor (200) and the worm (160) or to use a special low speed motor (that is to say less than about 500 rpm), and therefore a large and expensive motor.
  • Such a center distance could also make it necessary to compensate for this lack of reduction on the nut (143) with a smaller screw pitch and, consequently, fine and fragile threads.
  • a center distance larger than 350 mm would prohibitively increase the size of the jack and make it not very compatible with the reduced and congested space of the superstructures of electrolysis cells.
  • Said center distance E is preferably between 150 and 300 mm, and more preferably between 180 and 290 mm.
  • the reduction ratio RR is preferably limited to values less than 300: 1 in order to avoid the use of drive wheels (150) having a large diameter, which would be incompatible with the compactness constraint imposed on the invention.
  • the reduction ratio RR is preferably still between 100: 1 and 250: 1. In a preferred embodiment of the invention, the reduction ratio RR is between 140: 1 and 200: 1.
  • the worm (160) of the jack according to the invention is, or is likely to be, engaged directly on the shaft (210) of a drive motor (200), it that is to say without an intermediate reducer between the drive shaft and the worm, which makes it possible to significantly reduce the volume of the jack.
  • the drive motor (200) is preferably an alternating current motor (typically an asynchronous motor).
  • the motor power is typically between 3 and 20 kW (when the motor actuates a single cylinder, its power is typically between 3 and 8 kW; when the motor actuates two cylinders, its power is typically between 5 and 20 kW) .
  • the torque developed by the motor is preferably greater than 50 Nm and typically between 70 and 200 Nm.
  • the speed of rotation of the motor is typically between 750 and 1500 rpm, and more typically between 1000 and 1500 rpm.
  • the mean diameter D of the drive screw (130) is preferably less than 150 mm in order to limit the outside diameter of the sheath (120) to acceptable values.
  • the diameter D is preferably between 50 and 120 mm, and more preferably between 75 and 105 mm. A diameter of less than 50 mm would lead to excessive embrittlement of the drive screw (130).
  • Said thread (142) covers all or part of the interior wall of the actuating rod (140).
  • the thread (142) is advantageously formed on a threaded end piece (or nut) (143) which is fixed to the interior end (144) of the actuating rod (140) or integral with the latter.
  • the threads of the thread (142) can be single or multiple (for example, two parallel threads).
  • the length of the thread is typically at least 10 times the pitch of the drive screw.
  • the thread pitch (142) is preferably between 14 and 20 mm, and more preferably between 16 and 18 mm. The Applicant has observed that these thread pitch values made it possible to obtain high resistance to effort in the ranges of values of speed of movement of the actuating rod envisaged.
  • the dimensions and parameters of the jack according to the invention make it possible to simultaneously obtain, and in a satisfactory manner, displacement speeds of the actuating rod and traction forces compatible with the displacement of the anode frames of electrolysis cells, all by implying acceptable speeds of rotation of the motor shaft, the auger and the drive screw and which avoid the use of slow, bulky and high cost motors.
  • the rotational speed of the worm (160) is typically between 750 and 1500 rpm, and even more typically between 1000 and 1500 rpm.
  • the speed of the drive screw (130) is typically between 5 and 15 rpm, and more typically between 7 and 10 rpm. This speed is equal to that of the drive wheel when the drive screw is fixed to or fixed to the wheel.
  • the jack according to the invention can develop traction forces greater than 100 kN.
  • the tensile forces are typically between 150 and 600 kN.
  • the entry or exit displacement speeds of the actuator rod are typically between 100 and 300 mm min, and more typically between 120 and 150 mm min. These speeds are compatible with regulation by small pulses of the level of the anode frame.
  • the invention makes it possible to use drive motors whose diameter is less than 350 mm, or even less than 250 mm, while having the power and tensile forces necessary for moving anodic frames of electrolysis cells intended to the production of aluminum whose mass, including that of the anodes, is typically several tens of tonnes.
  • Cylinder dimensions according to the invention are typically from 550 to 700 mm in transverse dimension and from 1500 to 2400 mm in total length (with the actuating rod in the retracted position).
  • the drive wheel (150) is mechanically coupled to the drive screw (130).
  • the drive wheel (150) is fixed to or integral with the drive screw (130), the axis of rotation R of the drive wheel (150) and the axis of rotation T of the drive screw (130) coincide so as to form a common axis of rotation A.
  • the axis M of the motor (200) and the axis V of the worm (160) coincide
  • the axis V of the worm (1 0) is typically perpendicular to the axis R of the wheel .
  • the sheath (120) advantageously communicates with the casing (110) of the jack in order to have a reserve of unique lubricant, typically through openings (114).
  • the axial cavity (141) of the actuating rod (140) advantageously communicates with the sheath (120), typically by openings (146) arranged on its wall, in order to allow lubrication of the thread.
  • the outer end of the actuating rod (1 0) is provided with a fixing means (145).
  • the cylinder (100, 100 ') preferably has a seal (122) between the actuating rod (140) and the sheath (120). It has been found more advantageous to use a rigid sheath (120) rather than a bellows-shaped sheath, which is often provided with conventional long-stroke cylinders. Indeed, a bellows-shaped sheath, which folds and unfolds constantly during use, has the drawback of being sensitive to abrasion caused by abrasive materials, such as alumina, which are in suspension in the environment of an electrolysis cell and which could deposit in the folds of the bellows.
  • the sheath (120) advantageously comprises a tubular part of considerable length (typically approximately equal to the stroke of the rod inside the latter), to allow the movement of the actuating rod to be guided.
  • the drive wheel (150) of the jack according to the invention preferably rests on at least one bearing (151, 152).
  • the bearing can be located on the side opposite the drive screw (130) or between the wheel and the drive screw.
  • the fixing means (111) of the jack can be placed on the rear part (112) of the jack, that is to say the part of the jack opposite to the actuating rod (140), or on the front part ( 113) of the jack, typically on the sheath (120).
  • the cylinder drive motor (200) can be specific to one cylinder or common to at least two cylinders.
  • the motor shaft is typically through and connected to a cylinder on each side of the motor. The connection of the motor shaft to two or more cylinders allows greater compactness of the drive device and synchronization of the cylinders.
  • the jack according to the invention is very particularly intended to be used in an electrolysis cell for the production of aluminum.
  • the invention also relates to the use of a jack (100, 100 ') according to the invention for the displacement of an anode frame (12) of a superstructure (10) of a cell electrolysis (1) for the production of aluminum.
  • the invention also relates to a superstructure (10) intended to be installed in an electrolysis cell (1) for the production of aluminum and comprising an anode frame (12) and at least one jack (100, 100 ') according to the invention for moving said frame.
  • the invention also relates to an electrolysis cell (1) provided with such a superstructure (10).
  • Said electrolysis cells (1) are capable of operating at intensities typically greater than 300 kA, or even greater than 400 kA, and possibly reaching more than 500 kA. List of landmarks

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  • Engineering & Computer Science (AREA)
  • General 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)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Abstract

The invention relates to actuators used to displace an anode frame of an electrolysis cell used to produce aluminium. According to the invention, said actuator (100, 100') comprises a sheath (120) provided with an opening (121), an actuating rod (140) comprising an axial cavity (141) and threading (142) and which can be displaced in the opening, a drive screw (130) which is inserted into the cavity and which can cooperate with the threading in order to cause the displacement of the rod (140) in the sheath (120) and in the opening (121), a toothed drive wheel (150) coupled to the drive screw (130), and an endless screw which can be connected to the shaft of a drive motor (200) and which can cooperate with the drive wheel (150) causing it to rotate. The invention is characterized in that the centre distance between the axis R of the drive wheel and axis V of the endless screw is 100 - 350 mm, and in that the reduction ratio RR between the endless screw and the drive wheel is between 300:1 and 80:1. The inventive actuator makes it possible to achieve, simultaneously, relatively high traction power and forces, while taking up only a relatively limited volume.

Description

VERIN DESTINE AU DEPLACEMENT D'UN CADRE ANODIQUE D'UNE CELLULE D'ELECTROLYSE POUR LA PRODUCTION D'ALUMINIUM CYLINDER FOR MOVING AN ANODIC FRAME OF AN ELECTROLYSIS CELL FOR THE PRODUCTION OF ALUMINUM
Domaine de l'inventionField of the invention
L'invention concerne la production d'aluminium par électrolyse ignée selon le procédé de Hall-Héroult. Elle concerne plus particulièrement les dispositifs de fixation et de déplacement des anodes des cellules d'électrolyse destinées à la production d'aluminium.The invention relates to the production of aluminum by igneous electrolysis according to the Hall-Héroult process. It relates more particularly to the devices for fixing and moving the anodes of the electrolysis cells intended for the production of aluminum.
Etat de la techniqueState of the art
L'aluminium métal est produit industriellement par électrolyse ignée, à savoir par électrolyse de l'alumine en solution dans un bain de cryolithe fondue, appelé bain d'électrolyte, selon le procédé bien connu de Hall-Héroult. Le bain d'électrolyte est contenu dans des cuves, dites « cuves d'électrolyse », comprenant un caisson en acier, qui est revêtu intérieurement de matériaux réfractaires et/ou isolants, et un ensemble cathodique situé au fond de la cuve. Des anodes, typiquement en matériau carboné, sont fixées à une superstructure munie de moyens pour les déplacer verticalement durant le processus d'électrolyse. L'ensemble formé par une cuve d'électrolyse, ses anodes et le bain d'électrolyte est appelé une cellule d'électrolyse.Aluminum metal is produced industrially by igneous electrolysis, namely by electrolysis of alumina in solution in a bath of molten cryolite, called electrolyte bath, according to the well-known Hall-Héroult process. The electrolyte bath is contained in cells, called "electrolysis cells", comprising a steel box, which is coated internally with refractory and / or insulating materials, and a cathode assembly located at the bottom of the cell. Anodes, typically made of carbonaceous material, are fixed to a superstructure provided with means for moving them vertically during the electrolysis process. The assembly formed by an electrolysis tank, its anodes and the electrolyte bath is called an electrolysis cell.
Plusieurs dispositifs ont été proposés pour permettre la fixation et le déplacement des anodes par rapport à la cuve. La présente invention concerne plus particulièrement les dispositifs de fixation et de déplacement comprenant des éléments de structure fixes, un cadre - appelé cadre anodique - destiné au levage ou à l'abaissement simultané des anodes fixées au dit cadre et des moyens de déplacement du dit cadre comprenant un ou plusieurs vérins. Les brevets français FR 1 440 005 (correspondant au brevet américain US 4 410 786) et FR 2 517 704 (correspondants au brevet américain US 4465 578) décrivent de tels dispositifs. Le développement de cellules d'électrolyse d'intensité nominale de plus en plus élevée, de même que l'accroissement de l'intensité de cellules d'électrolyse existantes, entraînent un alourdissement des ensembles formés par un cadre anodique et des anodes fixées à celui-ci. Cet alourdissement nécessite des vérins aptes à développer des puissances de plus en plus grandes afin de permettre le déplacement desdits ensembles de manière satisfaisante.Several devices have been proposed to allow the fixing and movement of the anodes relative to the tank. The present invention relates more particularly to fastening and displacement devices comprising fixed structural elements, a frame - called an anode frame - intended for simultaneously lifting or lowering the anodes fixed to said frame and means for moving said frame comprising one or more cylinders. French patents FR 1,440,005 (corresponding to American patent US 4,410,786) and FR 2,517,704 (corresponding to American patent US 4,465,578) describe such devices. The development of electrolysis cells of increasingly higher nominal intensity, as well as the increase in the intensity of existing electrolysis cells, lead to an increase in the assemblies formed by an anode frame and anodes fixed to that -this. This weighting requires cylinders capable of developing increasingly greater powers in order to allow the displacement of said assemblies in a satisfactory manner.
La demanderesse a donc recherché des vérins aptes à développer des efforts élevés, aptes à s'insérer dans les espaces limités et encombrés des superstructures de cellules d'électrolyse, et aptes à fonctionner à proximité des cellules d'électrolyse de forte intensité.The Applicant has therefore sought actuators capable of developing high forces, capable of fitting into the limited and congested spaces of the superstructures of electrolysis cells, and able to operate near high intensity electrolysis cells.
Description de l'inventionDescription of the invention
L'invention a pour objet un vérin comprenant une gaine munie d'une ouverture, une tige d'actionnement comportant une cavité axiale et un filetage et apte à se déplacer dans ladite ouverture, une vis d'entraînement insérée dans ladite cavité axiale et apte à coopérer avec ledit filetage de manière à entraîner le déplacement de ladite tige dans la gaine et dans ladite ouverture, une roue d'entraînement dentée couplée à la vis d'entraînement, et une vis sans fin apte à être raccordée à l'arbre d'un moteur et à coopérer avec la roue d'entraînement de manière à entraîner sa rotation, et caractérisé en ce que l'entraxe E entre l'axe R de la roue d'entraînement et l'axe V de la vis sans fin est compris entre 100 et 350 mm, et en ce que le rapport de réduction RR entre la vis sans fin et la roue d'entraînement est compris entre 300:1 et 80:1.The subject of the invention is a jack comprising a sheath provided with an opening, an actuating rod comprising an axial cavity and a thread and capable of moving in said opening, a drive screw inserted in said axial cavity and suitable to cooperate with said thread so as to cause the displacement of said rod in the sheath and in said opening, a toothed drive wheel coupled to the drive screw, and an endless screw capable of being connected to the shaft d '' a motor and to cooperate with the drive wheel so as to drive its rotation, and characterized in that the distance E between the axis R of the drive wheel and the axis V of the worm is between 100 and 350 mm, and in that the reduction ratio RR between the worm and the drive wheel is between 300: 1 and 80: 1.
La demanderesse a trouvé qu'il était possible de concevoir un vérin capable d'atteindre simultanément des puissances et des efforts de traction relativement élevés, tout en étant susceptible d'occuper un volume relativement limité, grâce à la combinaison des caractéristiques du vérin selon l'invention. L'invention permet également d'obtenir un vérin irréversible, c'est-à-dire un vérin dont la tige d'actionnement bouge peu en charge, ce qui évite le recours à un frein intégré.The Applicant has found that it is possible to design a cylinder capable of simultaneously achieving relatively high powers and tensile forces, while being capable of occupying a relatively limited volume, thanks to the combination of the characteristics of the cylinder according to the 'invention. The invention also makes it possible to obtain an irreversible jack, that is to say a jack whose actuating rod moves little under load, which avoids the use of an integrated brake.
Le vérin selon l'invention est tout particulièrement adapté au déplacement des cadres anodiques des cellules d'électrolyse destinées à la production d'aluminium.The jack according to the invention is very particularly suitable for moving the anode frames of the electrolysis cells intended for the production of aluminum.
L'invention sera mieux comprise à l'aide de la description détaillée de modes de réalisation préférés de celle-ci qui sont exposés ci-dessous et qui sont illustrés à l'aide des figures annexées.The invention will be better understood with the aid of the detailed description of preferred embodiments thereof which are set out below and which are illustrated with the aid of the appended figures.
La figure 1 illustre une cellule d'électrolyse typique tronquée et vue en perspective.FIG. 1 illustrates a typical truncated electrolysis cell and seen in perspective.
La figure 2 illustre, vue en perspective, une superstructure typique d'une cellule d'électrolyse.FIG. 2 illustrates, in perspective view, a typical superstructure of an electrolysis cell.
La figure 3 illustre un vérin selon l'invention, vu en section longitudinale.FIG. 3 illustrates a jack according to the invention, seen in longitudinal section.
La figure 4 illustre un vérin selon l'invention, vu en section transversale selon le plan C-C de la figure 3.FIG. 4 illustrates a jack according to the invention, seen in cross section along the plane C-C of FIG. 3.
Les cellules d'électrolyse (1) d'une usine de production d'aluminium par électrolyse ignée comprennent une cuve (2), apte à contenir le métal liquide et le bain d'électrolyte, une superstructure (10) et une série d'anodes (3). La superstructure (10) comporte un portique fixe (11) et un cadre anodique métallique mobile (12). Les anodes (3) sont munies d'une tige métallique (4) destinée à la fixation et au raccordement électrique des anodes (3) au cadre anodique (12). La superstructure (10) comporte également au moins un vérin (100, 100') couplé au cadre anodique (12) par des bielles (20, 21, 22, 21', 22') et des leviers (30, 31, 32, 33, 34, 31', 32', 33', 34'). Le cadre anodique (12) est déplacé verticalement (vers le haut ou vers le bas) sous l'action du ou des vérins (100, 100'). Selon l'invention, le vérin (100, 100') comprend :The electrolysis cells (1) of a plant for the production of aluminum by igneous electrolysis include a tank (2), capable of containing the liquid metal and the electrolyte bath, a superstructure (10) and a series of anodes (3). The superstructure (10) comprises a fixed gantry (11) and a movable metallic anode frame (12). The anodes (3) are provided with a metal rod (4) intended for fixing and electrical connection of the anodes (3) to the anode frame (12). The superstructure (10) also comprises at least one jack (100, 100 ') coupled to the anode frame (12) by connecting rods (20, 21, 22, 21', 22 ') and levers (30, 31, 32, 33, 34, 31 ', 32', 33 ', 34'). The anode frame (12) is moved vertically (up or down) under the action of the jack (s) (100, 100 '). According to the invention, the jack (100, 100 ') comprises:
- une gaine (120) munie d'une ouverture (121),- a sheath (120) provided with an opening (121),
- une tige d'actionnement (140) comportant une cavité axiale (141) et un filetage (142) et apte à se déplacer dans ladite ouverture (121), - une vis d'entraînement (130) insérée dans ladite cavité axiale (141) et apte à coopérer avec ledit filetage (142) de manière à entraîner le déplacement de ladite tige (140) dans ladite gaine (120) et dans ladite ouverture (121),- an actuating rod (140) comprising an axial cavity (141) and a thread (142) and able to move in said opening (121), - a drive screw (130) inserted in said axial cavity (141 ) and able to cooperate with said thread (142) so as to cause displacement of said rod (140) in said sheath (120) and in said opening (121),
- une roue d'entraînement (150) dentée couplée à la vis d'entraînement (130),- a toothed drive wheel (150) coupled to the drive screw (130),
- une vis sans fin (160) apte à être raccordée à l'arbre (210) d'un moteur d'entraînement (200) et à coopérer avec la roue d'entraînement (150) de manière à entraîner sa rotation, et est caractérisé en ce que l'entraxe E entre l'axe R de la roue d'entraînement (150) et l'axe V de la vis sans fin (160) est compris entre 100 et 350 mm, et en ce que le rapport de réduction RR entre la vis sans fin (160) et la roue d'entraînement (150) est compris entre 300:1 et 80:1.- a worm (160) adapted to be connected to the shaft (210) of a drive motor (200) and to cooperate with the drive wheel (150) so as to cause its rotation, and is characterized in that the distance E between the axis R of the drive wheel (150) and the axis V of the worm (160) is between 100 and 350 mm, and in that the ratio of RR reduction between the worm (160) and the drive wheel (150) is between 300: 1 and 80: 1.
Le rapport de réduction RR est donné par le rapport entre le nombre de tours effectué par la vis sans fin (160) autour de son axe V lorsque la roue d'entraînement (150) effectue un tour complet autour de son axe A. En d'autres termes, le rapport de réduction RR est donné par le nombre de dents de la roue d'entraînement (150).The reduction ratio RR is given by the ratio between the number of revolutions made by the worm (160) around its axis V when the drive wheel (150) makes a complete revolution around its axis A. In d In other words, the reduction ratio RR is given by the number of teeth of the drive wheel (150).
Dans sa recherche d'une solution au problème posé à l'invention, la demanderesse a constaté que l'ensemble des contraintes imposées par l'utilisation d'un vérin dans les cellules d'électrolyse nécessitait la prise en compte d'un grand nombre de paramètres qui ne permettait pas de prévoir une zone de fonctionnement acceptable. En particulier, des paramètres variables proviennent d'au moins trois niveaux de couplage, à savoir un premier niveau entre l'arbre (210) du moteur d'entraînement (200) et la vis sans fin (160), un deuxième niveau entre la vis sans fin (160) et la roue d'entraînement (150) et un troisième niveau entre la roue d'entraînement (150) et la tige d'actionnement (140). Des paramètres variables proviennent également des relations qui relient les puissances en jeux (notamment les puissances d'entrée, interne et de sortie), les vitesses - linéaires et angulaires - souhaitées et acceptables, les rapports de réduction et les pas de filetage. En outre, des paramètres variables supplémentaires proviennent des coefficients de rendement des engrenages et des caractéristiques mécaniques des matériaux possibles.In its search for a solution to the problem posed to the invention, the Applicant has found that all of the constraints imposed by the use of a jack in the electrolysis cells required taking into account a large number parameters that did not allow for an acceptable operating area to be provided. In particular, variable parameters come from at least three coupling levels, namely a first level between the shaft (210) of the drive motor (200) and the worm (160), a second level between the worm (160) and the drive wheel (150) and a third level between the drive wheel (150) and the actuating rod (140). Variable parameters also come from relationships which connect the powers in play (notably the input, internal and output powers), the speeds - linear and angular - desired and acceptable, reduction ratios and thread pitches. In addition, additional variable parameters come from the efficiency coefficients of the gears and the mechanical characteristics of the possible materials.
La demanderesse a noté que, de manière inattendue, il était possible d'arriver à une solution au problème posé en s'éloignant sensiblement des configurations et valeurs de paramètres normalement utilisées dans les vérins connus.The Applicant has noted that, unexpectedly, it was possible to arrive at a solution to the problem posed by departing substantially from the configurations and parameter values normally used in known actuators.
En particulier, elle a noté qu'un entraxe plus petit que 100 mm permettrait difficilement d'obtenir la réduction de vitesse de rotation requise pour la vis d'entraînement (130) ou nécessiterait d'intercaler un étage de réduction de vitesse supplémentaire entre le moteur (200) et la vis sans fin (160) ou d'utiliser un moteur spécial à petite vitesse (c'est-à-dire moins de 500 tour/min environ), et donc un moteur de grande dimension et cher. Un tel entraxe pourrait également nécessiter de compenser ce manque de réduction sur l'écrou (143) avec un pas de vis plus petit et, par conséquent, des filets fins et fragiles. Un entraxe plus grand que 350 mm augmenterait de manière rédhibitoire la taille du vérin et le rendrait peu compatible avec l'espace réduit et encombré des superstructures de cellules d'électrolyse. Ledit entraxe E est de préférence compris entre 150 et 300 mm, et de préférence encore entre 1S0 et 290 mm.In particular, it noted that a center distance smaller than 100 mm would make it difficult to obtain the reduction in speed required for the drive screw (130) or would require inserting an additional speed reduction stage between the motor (200) and the worm (160) or to use a special low speed motor (that is to say less than about 500 rpm), and therefore a large and expensive motor. Such a center distance could also make it necessary to compensate for this lack of reduction on the nut (143) with a smaller screw pitch and, consequently, fine and fragile threads. A center distance larger than 350 mm would prohibitively increase the size of the jack and make it not very compatible with the reduced and congested space of the superstructures of electrolysis cells. Said center distance E is preferably between 150 and 300 mm, and more preferably between 180 and 290 mm.
En outre, elle a constaté qu'un rapport de réduction inférieur à 80:1 imposerait l'utilisation d'un étage de réduction supplémentaire entre le moteur et la vis sans fin afin d'obtenir les faibles vitesses de déplacement (entrées et sorties) de la tige d'actionnement requises dans l'utilisation envisagée. Le rapport de réduction RR est de préférence limité à des valeurs inférieures à 300:1 afin d'éviter le recours à des roues d'entraînement (150) ayant un grand diamètre, ce qui serait incompatible avec la contrainte de compacité imposée à l'invention. Le rapport de réduction RR est de préférence encore compris entre 100:1 et 250:1. Dans un mode de réalisation préféré de l'invention, le rapport de réduction RR est compris entre 140: 1 et 200: 1. La demanderesse a également constaté que la vis sans fin (160) du vérin selon l'invention est, ou est susceptible d'être, engagée directement sur l'arbre (210) d'un moteur d'entraînement (200), c'est-à-dire sans réducteur intermédiaire entre l'arbre d'entraînement et la vis sans fin, ce qui permet de réduire sensiblement le volume du vérin. Il peut y avoir un couplage souple entre l'arbre du moteur et la vis sans fin.In addition, it found that a reduction ratio of less than 80: 1 would require the use of an additional reduction stage between the motor and the worm in order to obtain low travel speeds (inputs and outputs). of the actuating rod required in the intended use. The reduction ratio RR is preferably limited to values less than 300: 1 in order to avoid the use of drive wheels (150) having a large diameter, which would be incompatible with the compactness constraint imposed on the invention. The reduction ratio RR is preferably still between 100: 1 and 250: 1. In a preferred embodiment of the invention, the reduction ratio RR is between 140: 1 and 200: 1. The Applicant has also found that the worm (160) of the jack according to the invention is, or is likely to be, engaged directly on the shaft (210) of a drive motor (200), it that is to say without an intermediate reducer between the drive shaft and the worm, which makes it possible to significantly reduce the volume of the jack. There may be a flexible coupling between the motor shaft and the worm.
Le moteur d'entraînement (200) est de préférence un moteur à courant alternatif (typiquement un moteur asynchrone). La puissance du moteur est typiquement comprise entre 3 et 20 kW (lorsque le moteur actionne un seul vérin, sa puissance est typiquement comprise entre 3 et 8 kW ; lorsque le moteur actionne deux vérins, sa puissance est typiquement comprise entre 5 et 20 kW). Le couple développé par le moteur est de préférence supérieur à 50 Nm et typiquement compris entre 70 et 200 Nm. La vitesse de rotation du moteur se situe typiquement entre 750 et 1500 tr/mn, et plus typiquement entre 1000 et 1500 tr/mn.The drive motor (200) is preferably an alternating current motor (typically an asynchronous motor). The motor power is typically between 3 and 20 kW (when the motor actuates a single cylinder, its power is typically between 3 and 8 kW; when the motor actuates two cylinders, its power is typically between 5 and 20 kW) . The torque developed by the motor is preferably greater than 50 Nm and typically between 70 and 200 Nm. The speed of rotation of the motor is typically between 750 and 1500 rpm, and more typically between 1000 and 1500 rpm.
Le diamètre moyen D de la vis d'entraînement (130) est de préférence inférieur à 150 mm afin de limiter le diamètre extérieur de la gaine (120) à des valeurs acceptables. Le diamètre D est de préférence compris entre 50 et 120 mm, et de préférence encore entre 75 et 105 mm. Un diamètre inférieur à 50 mm conduirait à une trop grande fragilisation de la vis d'entraînement (130).The mean diameter D of the drive screw (130) is preferably less than 150 mm in order to limit the outside diameter of the sheath (120) to acceptable values. The diameter D is preferably between 50 and 120 mm, and more preferably between 75 and 105 mm. A diameter of less than 50 mm would lead to excessive embrittlement of the drive screw (130).
Ledit filetage (142) couvre tout ou partie de la paroi intérieure de la tige d'actionnement (140). Le filetage (142) est avantageusement formé sur un embout fileté (ou écrou) (143) qui est fixé à l'extrémité intérieure (144) de la tige d'actionnement (140) ou solidaire de celle-ci. Les filets du filetage (142) peuvent être simples ou multiples (par exemple, deux filets parallèles). La longueur du filetage est typiquement au moins égale à 10 fois le pas de la vis d'entraînement. Le pas du filetage (142) est de préférence compris entre 14 et 20 mm, et de préférence encore entre 16 et 18 mm. La demanderesse a observé que ces valeurs de pas de filetage permettaient d'obtenir une tenue à l'effort élevée dans les plages de valeurs de vitesse de déplacement de la tige d'actionnement envisagées. Les dimensions et paramètres du vérin selon l'invention permettent d'obtenir simultanément, et de manière satisfaisante, des vitesses de déplacement de la tige d'actionnement et des efforts de tractions compatibles avec le déplacement des cadres anodiques de cellules d'électrolyse, tout en impliquant des vitesses de rotation de l'arbre du moteur, de la vis sans fin et de la vis d'entraînement acceptables et qui évitent le recours à des moteurs lents, volumineux et de coût élevé.Said thread (142) covers all or part of the interior wall of the actuating rod (140). The thread (142) is advantageously formed on a threaded end piece (or nut) (143) which is fixed to the interior end (144) of the actuating rod (140) or integral with the latter. The threads of the thread (142) can be single or multiple (for example, two parallel threads). The length of the thread is typically at least 10 times the pitch of the drive screw. The thread pitch (142) is preferably between 14 and 20 mm, and more preferably between 16 and 18 mm. The Applicant has observed that these thread pitch values made it possible to obtain high resistance to effort in the ranges of values of speed of movement of the actuating rod envisaged. The dimensions and parameters of the jack according to the invention make it possible to simultaneously obtain, and in a satisfactory manner, displacement speeds of the actuating rod and traction forces compatible with the displacement of the anode frames of electrolysis cells, all by implying acceptable speeds of rotation of the motor shaft, the auger and the drive screw and which avoid the use of slow, bulky and high cost motors.
La vitesse de rotation de la vis sans fin (160) est typiquement comprise entre 750 et 1500 tr/mn, et plus typiquement encore entre 1000 et 1500 tr/mn. La vitesse de la vis d'entraînement (130) est typiquement comprise entre 5 et 15 tr/mn, et plus typiquement entre 7 et 10 tr/mn. Cette vitesse est égale à celle de la roue d'entraînement lorsque la vis d'entraînement est fixée à la roue ou solidaire de celle- ci. Ces vitesses permettent d'atteindre simultanément, et de manière satisfaisante, des vitesses de déplacement de la tige d'actionnement et des efforts de tractions acceptables pour le déplacement des cadres anodiques de cellules d'électrolyse.The rotational speed of the worm (160) is typically between 750 and 1500 rpm, and even more typically between 1000 and 1500 rpm. The speed of the drive screw (130) is typically between 5 and 15 rpm, and more typically between 7 and 10 rpm. This speed is equal to that of the drive wheel when the drive screw is fixed to or fixed to the wheel. These speeds make it possible to reach, simultaneously and satisfactorily, speeds of movement of the actuating rod and acceptable tensile forces for the movement of the anode frames of electrolysis cells.
Le vérin selon l'invention peut développer des efforts de tractions supérieurs à 100 kN. Les efforts de traction sont typiquement compris entre 150 et 600 kN. De tels efforts sont requis pour déplacer verticalement un cadre anodique chargé d'anodes sans avoir recours à des rapports de levier importants au niveau des leviers de la superstructure d'une cellule d'électrolyse.The jack according to the invention can develop traction forces greater than 100 kN. The tensile forces are typically between 150 and 600 kN. Such efforts are required to vertically move an anode frame loaded with anodes without resorting to significant lever ratios at the levers of the superstructure of an electrolysis cell.
Les vitesses de déplacement d'entrée ou de sortie de la tige du vérin sont typiquement comprises entre 100 et 300 mm mn, et plus typiquement entre 120 et 150 mm mn. Ces vitesses sont compatibles avec une régulation par petites impulsions du niveau du cadre anodique.The entry or exit displacement speeds of the actuator rod are typically between 100 and 300 mm min, and more typically between 120 and 150 mm min. These speeds are compatible with regulation by small pulses of the level of the anode frame.
L'invention permet d'utiliser des moteurs d'entraînement dont le diamètre est inférieur à 350 mm, voire inférieur à 250 mm, tout en disposant de la puissance et des efforts de traction nécessaires au déplacement de cadres anodiques de cellules d'électrolyse destinées à la production d'aluminium dont la masse, incluant celle des anodes, est typiquement de plusieurs dizaines de tonnes. Les dimensions du vérin selon l'invention sont typiquement de 550 à 700 mm en dimension transversale et de 1500 à 2400 mm en longueur totale (avec la tige d'actionnement en position rétractée).The invention makes it possible to use drive motors whose diameter is less than 350 mm, or even less than 250 mm, while having the power and tensile forces necessary for moving anodic frames of electrolysis cells intended to the production of aluminum whose mass, including that of the anodes, is typically several tens of tonnes. Cylinder dimensions according to the invention are typically from 550 to 700 mm in transverse dimension and from 1500 to 2400 mm in total length (with the actuating rod in the retracted position).
La roue d'entraînement (150) est couplée mécaniquement à la vis d'entraînement (130). Dans un mode de réalisation préféré de l'invention, la roue d'entraînement (150) est fixée à la vis d'entraînement (130), ou solidaire de celle-ci, l'axe de rotation R de la roue d'entraînement (150) et l'axe de rotation T de la vis d'entraînement (130) coïncident de manière à former un axe de rotation commun A.The drive wheel (150) is mechanically coupled to the drive screw (130). In a preferred embodiment of the invention, the drive wheel (150) is fixed to or integral with the drive screw (130), the axis of rotation R of the drive wheel (150) and the axis of rotation T of the drive screw (130) coincide so as to form a common axis of rotation A.
De préférence, l'axe M du moteur (200) et l'axe V de la vis sans fin (160) coïncident L'axe V de la vis sans fin (1 0) est typiquement perpendiculaire à l'axe R de la roue.Preferably, the axis M of the motor (200) and the axis V of the worm (160) coincide The axis V of the worm (1 0) is typically perpendicular to the axis R of the wheel .
La gaine (120) communique avantageusement avec le carter (110) du vérin afin d'avoir une réserve de lubrifiant unique» typiquement par des ouvertures (114). La cavité axiale (141) de îa tige d'actionnement (140) communique avantageusement avec la gaine (120), typiquement par des ouvertures (146) aménagées sa paroi, afin de permettre une lubrification du filetage. L'extrémité extérieure de la tige d'actionnement (1 0) est munie d'un moyen de fixation (145).The sheath (120) advantageously communicates with the casing (110) of the jack in order to have a reserve of unique lubricant, typically through openings (114). The axial cavity (141) of the actuating rod (140) advantageously communicates with the sheath (120), typically by openings (146) arranged on its wall, in order to allow lubrication of the thread. The outer end of the actuating rod (1 0) is provided with a fixing means (145).
Le vérin (100, 100') comporte de préférence un joint d'étanchéité (122) entre la tige d'actionnement (140) et la gaine (120). Il a été trouvé plus avantageux d'utiliser une gaine (120) rigide plutôt qu'une gaine en forme de soufflet, dont sont souvent munis les vérins classiques à grande course. En effet, une gaine en forme de soufflet, qui se plie et se déplie constamment en cours d'utilisation, présente l'inconvénient d'être sensible à l'abrasion provoquée par des matières abrasives, telles que l'alumine, qui sont en suspension dans l'environnement d'une cellule d'électrolyse et qui pourraient se déposer dans les plis du soufflet.The cylinder (100, 100 ') preferably has a seal (122) between the actuating rod (140) and the sheath (120). It has been found more advantageous to use a rigid sheath (120) rather than a bellows-shaped sheath, which is often provided with conventional long-stroke cylinders. Indeed, a bellows-shaped sheath, which folds and unfolds constantly during use, has the drawback of being sensitive to abrasion caused by abrasive materials, such as alumina, which are in suspension in the environment of an electrolysis cell and which could deposit in the folds of the bellows.
La gaine (120) comporte avantageusement une partie tubulaire de longueur importante (typiquement approximativement égale à la course de la tige d'actionnement à l'intérieure de celle-ci), afin de permettre de guider les déplacements de la tige d'actionnement.The sheath (120) advantageously comprises a tubular part of considerable length (typically approximately equal to the stroke of the rod inside the latter), to allow the movement of the actuating rod to be guided.
La roue d'entraînement (150) du vérin selon l'invention repose de préférence sur au moins un palier (151, 152). Le palier peut être situé du côté opposé à la vis d'entraînement (130) ou entre la roue et la vis d'entraînement.The drive wheel (150) of the jack according to the invention preferably rests on at least one bearing (151, 152). The bearing can be located on the side opposite the drive screw (130) or between the wheel and the drive screw.
Les moyens de fixation (111) du vérin peuvent être placés sur la partie arrière (112) du vérin, c'est-à-dire la partie du vérin opposée à la tige d'actionnement (140), ou sur la partie avant (113) du vérin, typiquement sur la gaine (120).The fixing means (111) of the jack can be placed on the rear part (112) of the jack, that is to say the part of the jack opposite to the actuating rod (140), or on the front part ( 113) of the jack, typically on the sheath (120).
Le moteur (200) d'entraînement du vérin peut être propre à un vérin ou commun à au moins deux vérins. Dans le cas de deux vérins, l'arbre du moteur est typiquement traversant et raccordé à un vérin de chaque côté du moteur. Le raccordement de l'arbre du moteur à deux ou plusieurs vérins permet une plus grande compacité du dispositif d'entraînement et une synchronisation des vérins.The cylinder drive motor (200) can be specific to one cylinder or common to at least two cylinders. In the case of two cylinders, the motor shaft is typically through and connected to a cylinder on each side of the motor. The connection of the motor shaft to two or more cylinders allows greater compactness of the drive device and synchronization of the cylinders.
Le vérin selon l'invention est tout particulièrement destiné à être utilisé dans une cellule d'électrolyse pour la production d'aluminium. Ainsi, l'invention a également pour objet l'utilisation d'un vérin (100, 100') selon l'invention pour le déplacement d'un cadre anodique (12) d'une superstructure (10) d'une cellule d'électrolyse (1) destinée à la production d'aluminium.The jack according to the invention is very particularly intended to be used in an electrolysis cell for the production of aluminum. Thus, the invention also relates to the use of a jack (100, 100 ') according to the invention for the displacement of an anode frame (12) of a superstructure (10) of a cell electrolysis (1) for the production of aluminum.
L'invention a encore pour objet une superstructure (10) destinée à être installée dans une cellule d'électrolyse (1) pour la production d'aluminium et comportant un cadre anodique (12) et au moins un vérin (100, 100') selon l'invention pour déplacer ledit cadre. L'invention a encore pour objet une cellule d'électrolyse (1) munie d'une telle superstructure (10).The invention also relates to a superstructure (10) intended to be installed in an electrolysis cell (1) for the production of aluminum and comprising an anode frame (12) and at least one jack (100, 100 ') according to the invention for moving said frame. The invention also relates to an electrolysis cell (1) provided with such a superstructure (10).
Lesdites cellules d'électrolyse (1) sont susceptibles de fonctionner à des intensités typiquement supérieures à 300 kA, voire supérieure à 400 kA, et pouvant atteindre plus de 500 kA. Liste des repèresSaid electrolysis cells (1) are capable of operating at intensities typically greater than 300 kA, or even greater than 400 kA, and possibly reaching more than 500 kA. List of landmarks
1 Cellule d'électrolyse1 electrolysis cell
2 Cuve2 Tank
3 Anode3 Anode
4 Tige d'anode4 Anode rod
10 Superstructure10 Superstructure
11 Portique11 Gantry
12 Cadre anodique12 Anode frame
20, 21, 22, 21', 22' Bielles20, 21, 22, 21 ', 22' Connecting rods
30, 31, 325..., 31«, 32',.. . Leviers30, 31, 32 5 ..., 31 " , 32 ', .... Lifts
100, 100' Vérin100, 100 'Cylinder
110 Carter du vérin110 Cylinder housing
111 Moyen de fixation111 Fastening means
112 Partie arrière du vérin112 Rear part of the cylinder
113 Partie avant du vérin113 Front part of the cylinder
114 Ouverture114 Opening
120 Gaine120 Sheath
121 Ouverture121 Opening
122 Joint d'étanchéité122 Seal
130 Vis d'entraînement130 Drive screw
140 Tige d'actionnement140 Actuating rod
141 Cavité axiale141 Axial cavity
142 Filetage142 Thread
143 Embout fileté (écrou)143 Threaded end (nut)
144 Extrémité intérieure de la tige d'actionnement144 Inner end of the operating rod
145 Moyen de fixation145 Fastening means
146 Ouverture146 Opening
150 Roue d'entraînement150 Drive wheel
151, 152 Paliers151, 152 Bearings
160 Vis sans fin 200 Moteur d'entraînement160 Worm screw 200 Drive motor
210 Arbre du moteur210 Motor shaft
A Axe du vérinA Cylinder axis
D Diamètre moyen de la vis d'entraînementD Average diameter of the drive screw
E Entraxe de réductionE Reduction center distance
M Axe du moteurM Motor axis
R Axe de la roue d'entraînementR Axis of the drive wheel
RR Rapport de réductionRR Reduction ratio
T Axe de la tige d'actionnementT Axis of the actuating rod
V Axe de la vis sans fin V Axis of the worm

Claims

REVENDICATIONS
1. Vérin (100, 100') comportant une gaine (120) munie d'une ouverture (121), une tige d'actionnement (140) comportant une cavité axiale (141) et un filetage (142) et apte à se déplacer dans ladite ouverture (121), une vis d'entraînement (130) insérée dans ladite cavité axiale (141) et apte à coopérer avec ledit filetage (142) de manière à entraîner le déplacement de ladite tige (140) dans ladite gaine (120) et dans ladite ouverture (121), une roue d'entraînement (150) dentée couplée à la vis d'entraînement (130), une vis sans fin (160) apte à être raccordée à l'arbre (210) d'un moteur d'entraînement (200) et à coopérer avec la roue d'entraînement1. Cylinder (100, 100 ') comprising a sheath (120) provided with an opening (121), an actuating rod (140) comprising an axial cavity (141) and a thread (142) and able to move in said opening (121), a drive screw (130) inserted in said axial cavity (141) and able to cooperate with said thread (142) so as to cause displacement of said rod (140) in said sheath (120 ) and in said opening (121), a toothed drive wheel (150) coupled to the drive screw (130), an endless screw (160) capable of being connected to the shaft (210) of a drive motor (200) and to cooperate with the drive wheel
(150) de manière à entraîner sa rotation, et caractérisé en ce que l'entraxe E entre l'axe R de la roue d'entraînement (150) et l'axe V de la vis sans fin (160) est compris entre 100 et 350 mm, et en ce que le rapport de réduction RR entre la vis sans fin (160) et la roue d'entraînement (150) est compris entre 300:1 et 80:1.(150) so as to cause it to rotate, and characterized in that the center distance E between the axis R of the drive wheel (150) and the axis V of the worm (160) is between 100 and 350 mm, and in that the reduction ratio RR between the worm (160) and the drive wheel (150) is between 300: 1 and 80: 1.
2. Vérin (100, 100') selon la revendication 1, caractérisé en ce que l'entraxe E est compris entre 150 et 300 mm.2. Cylinder (100, 100 ') according to claim 1, characterized in that the distance E is between 150 and 300 mm.
3. Vérin (100, 100') selon la revendication 1, caractérisé en ce que l'entraxe E est compris entre 180 et 290 mm.3. Cylinder (100, 100 ') according to claim 1, characterized in that the center distance E is between 180 and 290 mm.
4. Vérin (100, 100') selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le rapport de réduction RR est compris entre 100:1 et 250:1.4. Cylinder (100, 100 ') according to any one of claims 1 to 3, characterized in that the reduction ratio RR is between 100: 1 and 250: 1.
5. Vérin (100, 100') selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le rapport de réduction RR est compris entre 140:1 et 200: 1.5. Cylinder (100, 100 ') according to any one of claims 1 to 3, characterized in that the reduction ratio RR is between 140: 1 and 200: 1.
6. Vérin (100, 100') selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la vis sans fin (160) du vérin est, ou est susceptible d'être, engagée directement sur l'arbre (210) d'un moteur d'entraînement (200). 6. Jack (100, 100 ') according to any one of claims 1 to 5, characterized in that the worm (160) of the jack is, or is likely to be, engaged directly on the shaft (210 ) a drive motor (200).
7. Vérin (100, 100') selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le diamètre moyen D de la vis d'entraînement (130) est inférieur à 150 mm.7. Cylinder (100, 100 ') according to any one of claims 1 to 6, characterized in that the average diameter D of the drive screw (130) is less than 150 mm.
8. Vérin (100, 100') selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le diamètre moyen D de la vis d'entraînement (130) est compris entre 50 et 120 mm.8. Cylinder (100, 100 ') according to any one of claims 1 to 6, characterized in that the average diameter D of the drive screw (130) is between 50 and 120 mm.
9. Vérin (100, 100') selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le diamètre moyen D de la vis d'entraînement (130) est compris entre 75 et 105 mm.9. Cylinder (100, 100 ') according to any one of claims 1 to 6, characterized in that the average diameter D of the drive screw (130) is between 75 and 105 mm.
10. Vérin (100, 100') selon l'une quelconque des revendications 1 à 9, caractérisé en ce que le filetage (142) est formé sur un embout fileté (143) qui est fixé à l'extrémité intérieure (144) de la tige d'actionnement (140) ou solidaire de celle- ci.10. Cylinder (100, 100 ') according to any one of claims 1 to 9, characterized in that the thread (142) is formed on a threaded end piece (143) which is fixed to the inner end (144) of the actuating rod (140) or integral therewith.
11. Vérin (100, 100') selon l'une quelconque des revendications 1 à 10, caractérisé en ce que le pas du filetage (142) est compris entre 14 et 20 mm.11. Cylinder (100, 100 ') according to any one of claims 1 to 10, characterized in that the pitch of the thread (142) is between 14 and 20 mm.
12. Vérin (100, 100') selon l'une quelconque des revendications 1 à 10, caractérisé en ce que pas du filetage (142) est compris entre 16 et 18 mm.12. Cylinder (100, 100 ') according to any one of claims 1 to 10, characterized in that the thread pitch (142) is between 16 and 18 mm.
13. Vérin (100, 100') selon l'une quelconque des revendications 1 à 12, caractérisé en ce que la roue d'entraînement (150) est fixée à la vis d'entraînement (130), ou solidaire de celle-ci, et en ce que l'axe de rotation R de la roue d'entraînement (150) et l'axe de rotation T de la vis d'entraînement (130) coïncident de manière à former un axe de rotation commun A.13. Cylinder (100, 100 ') according to any one of claims 1 to 12, characterized in that the drive wheel (150) is fixed to the drive screw (130), or integral with the latter , and in that the axis of rotation R of the drive wheel (150) and the axis of rotation T of the drive screw (130) coincide so as to form a common axis of rotation A.
14. Utilisation d'un vérin (100, 100') selon l'une quelconque des revendications 1 à 13 pour le déplacement d'un cadre anodique (12) d'une superstructure (10) d'une cellule d'électrolyse (1) destinée à la production d'aluminium. 14. Use of a jack (100, 100 ') according to any one of claims 1 to 13 for the displacement of an anode frame (12) of a superstructure (10) of an electrolysis cell (1 ) intended for the production of aluminum.
15. Superstructure (10) destinée à être installée dans une cellule d'électrolyse (1) pour la production d'aluminium et comportant un cadre anodique (12) et au moins un vérin (100, 100') selon l'une quelconque des revendications 1 à 13 pour déplacer ledit cadre.15. Superstructure (10) intended to be installed in an electrolysis cell (1) for the production of aluminum and comprising an anode frame (12) and at least one jack (100, 100 ') according to any one of claims 1 to 13 for moving said frame.
16. Cellule d'électrolyse (1) munie d'une superstructure (10) selon la revendication 15. 16. Electrolysis cell (1) provided with a superstructure (10) according to claim 15.
PCT/FR2004/000429 2003-02-28 2004-02-26 Actuator for displacing an anode frame of an electrolysis cell for the production of aluminium WO2004079227A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US10/542,353 US20060137972A1 (en) 2003-02-28 2004-02-26 Actuator for displacing an anode frame of an electrolysis cell for the production of aluminium
CA002517148A CA2517148A1 (en) 2003-02-28 2004-02-26 Actuator for displacing an anode frame of an electrolysis cell for the production of aluminium
BRPI0407920-5A BRPI0407920A (en) 2003-02-28 2004-02-26 jack intended for displacement of an anode frame of an electrolysis cell for the production of aluminum
EP04714820A EP1597494A1 (en) 2003-02-28 2004-02-26 Actuator for displacing an anode frame of an electrolysis cell for the production of aluminium
AU2004217776A AU2004217776A1 (en) 2003-02-28 2004-02-26 Actuator for displacing an anode frame of an electrolysis cell for the production of aluminium
IS7988A IS7988A (en) 2003-02-28 2005-08-18 Lifting device for moving the electrolytic anchoring anode bridge for aluminum production

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0302493A FR2851810B1 (en) 2003-02-28 2003-02-28 VERIN FOR THE DISPLACEMENT OF AN ANODIC FRAMEWORK OF AN ELECTROLYSIS CELL FOR THE PRODUCTION OF ALUMINUM
FR03/02493 2003-02-28

Publications (1)

Publication Number Publication Date
WO2004079227A1 true WO2004079227A1 (en) 2004-09-16

Family

ID=32843080

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2004/000429 WO2004079227A1 (en) 2003-02-28 2004-02-26 Actuator for displacing an anode frame of an electrolysis cell for the production of aluminium

Country Status (12)

Country Link
US (1) US20060137972A1 (en)
EP (1) EP1597494A1 (en)
CN (1) CN1754053A (en)
AR (1) AR043214A1 (en)
AU (1) AU2004217776A1 (en)
BR (1) BRPI0407920A (en)
CA (1) CA2517148A1 (en)
FR (1) FR2851810B1 (en)
IS (1) IS7988A (en)
RU (1) RU2005130161A (en)
WO (1) WO2004079227A1 (en)
ZA (1) ZA200506333B (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN116169586A (en) * 2022-12-30 2023-05-26 国家电投集团云南国际电力投资有限公司 Electrolytic aluminum bus protection cabinet

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FR2884833B1 (en) * 2005-04-20 2007-05-25 Ecl Soc Par Actions Simplifiee DEVICE AND METHOD FOR MAINTAINING AND CONNECTING AN ANODE ROD ON ANODIC FRAME OF AN ALUMINUM ELECTROLISE CELL
FR2913985B1 (en) * 2007-03-23 2009-08-28 Ecl Soc Par Actions Simplifiee SERVICE MODULE HAVING AT LEAST ONE ANODE CLAMP AND A MEANS FOR EXERCISING FORCE OR SHOCK ON THE ANODE ROD.
FR2981420B1 (en) * 2011-10-17 2013-11-29 Commissariat Energie Atomique ASYMMETRIC ANTI-ROTATION DEVICE AND SCREW JACK WITH SUCH A DEVICE
FR3016894B1 (en) * 2014-01-27 2017-09-01 Rio Tinto Alcan Int Ltd ELECTROLYSIS TANK HAVING AN ANODIC ASSEMBLY CONTAINED IN A CONFINEMENT ENCLOSURE
GB2543788A (en) * 2015-10-28 2017-05-03 Dubai Aluminium Pjsc Superstructure for electrolytic cell, comprising means of moving anode beam with respect to the frame of this superstructure
FI127194B (en) * 2016-04-14 2018-01-31 Kumera Drives Oy METHOD AND ADJUSTMENT MECHANISM IN THE ALUMINUM ALLOY

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FR1440005A (en) 1965-04-09 1966-05-27 Pechiney Prod Chimiques Sa Process for producing a superstructure for an igneous electrolysis cell and superstructures produced according to this process
US3957144A (en) * 1973-09-13 1976-05-18 Duff-Norton Company, Inc. Continuous roller brake
FR2517704A1 (en) 1981-12-08 1983-06-10 Pechiney Aluminium Jig for accurate adjustment of anode plane - in cell used for mfg. aluminium by electrolysis of molten cryolite contg. alumina
DE9412223U1 (en) * 1994-07-29 1995-11-30 Koch Dietmar Linear drive for moving swiveling or parallel guided elements
US6158295A (en) * 1996-12-23 2000-12-12 Linak A/S Linear actuator
WO2002029284A1 (en) * 2000-10-03 2002-04-11 Linak A/S A linear actuator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116169586A (en) * 2022-12-30 2023-05-26 国家电投集团云南国际电力投资有限公司 Electrolytic aluminum bus protection cabinet
CN116169586B (en) * 2022-12-30 2024-02-06 国家电投集团云南国际电力投资有限公司 Electrolytic aluminum bus protection cabinet

Also Published As

Publication number Publication date
CA2517148A1 (en) 2004-09-16
AU2004217776A1 (en) 2004-09-16
CN1754053A (en) 2006-03-29
BRPI0407920A (en) 2006-03-01
US20060137972A1 (en) 2006-06-29
IS7988A (en) 2005-08-18
AR043214A1 (en) 2005-07-20
FR2851810A1 (en) 2004-09-03
FR2851810B1 (en) 2006-02-17
ZA200506333B (en) 2006-10-25
EP1597494A1 (en) 2005-11-23
RU2005130161A (en) 2006-01-27

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