EP2614178B1 - Organe de manutention securisee de connecteurs de cellules d'electrolyse destinees a la production d'aluminium - Google Patents

Organe de manutention securisee de connecteurs de cellules d'electrolyse destinees a la production d'aluminium Download PDF

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Publication number
EP2614178B1
EP2614178B1 EP11761648.2A EP11761648A EP2614178B1 EP 2614178 B1 EP2614178 B1 EP 2614178B1 EP 11761648 A EP11761648 A EP 11761648A EP 2614178 B1 EP2614178 B1 EP 2614178B1
Authority
EP
European Patent Office
Prior art keywords
gripping member
handling device
handling
trunnion
connector
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.)
Not-in-force
Application number
EP11761648.2A
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German (de)
English (en)
French (fr)
Other versions
EP2614178A1 (fr
Inventor
Stéphane DAVID
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.)
Fives ECL SAS
Original Assignee
Fives ECL SAS
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 Fives ECL SAS filed Critical Fives ECL SAS
Publication of EP2614178A1 publication Critical patent/EP2614178A1/fr
Application granted granted Critical
Publication of EP2614178B1 publication Critical patent/EP2614178B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/42—Gripping members engaging only the external or internal surfaces of the articles
    • 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
    • C25C3/16—Electric current supply devices, e.g. bus bars

Definitions

  • the invention relates to handling equipment used in aluminum production plants by igneous electrolysis according to the Hall-Héroult process. It relates more particularly to the handling devices of the connectors which ensure the attachment and electrical contact of the anodes on the anode frame.
  • 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 tanks, 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 tank.
  • Anodes typically of carbonaceous material, are partially immersed in the electrolyte bath.
  • the assembly formed by an electrolytic cell, its anodes and the electrolyte bath is called an electrolysis cell.
  • the anodes are provided with a metal rod for electrical and mechanical connection to a metal frame, called anode frame, which is movable relative to a fixed gantry disposed above the electrolytic cell.
  • the anode rods are connected to the anode frame using removable connectors capable of being deposited on support hooks arranged on either side of the anode rods and operable to press the anode rods against the anode rods. anodic frame.
  • French patent FR 2 039 543 (corresponding to the US patent US 3,627,670 ) describes such devices, which have a clamping screw whose actuation allows to place the connector in a tight configuration, where it plates the anode rod against the anode frame thus ensuring electrical contact, and in a loose configuration where it can be removed to allow disconnection of the anode rod.
  • an electrolysis plant requires interventions on the electrolysis cells including, in particular, the replacement of spent anodes with new anodes.
  • factories are generally equipped with at least one lifting and handling unit comprising an overhead crane, which can be translated over and along the electrolysis cells, and a trolley equipped with several handling and intervention devices (often called "tools").
  • tools also called "tools"
  • Such a lifting and handling unit may in particular be equipped with a device for the handling of the connectors, in particular their installation, their removal and their transport, such as the connector described in the French patent FR 2 039 543 .
  • This handling member comprises a clamping member which cooperates with the clamping screw so as to modify the clamping state of the connector and a locking system which cooperates with said clamping member so as to keep the connector locked in a position determined in the handling member, when the connector is loosened with the aid of the clamping member. It further comprises two movable members having an open position and a closed position, and can serve as a support for the connector when in the closed position and that, by accident, the connector is not or is no longer retained by the blocking system.
  • the moving members move from one position to another under the effect of cams which cooperate with the upper surface of the support hooks during vertical downward movement of the handling member.
  • these mobile members are subjected to frequent shocks and twist or bend easily, so that they are wedged or closed and that, their end no longer passing underneath the trunnions, they end up no longer able act as a safety support in case the connector is no longer held by the locking system. This requires many maintenance visits to this device that result in frequent replacements of said mobile members. To avoid these drawbacks, the applicant has decided to develop a connector handling member more solid and more reliable.
  • the subject of the invention is a handling device intended in particular to reliably and permanently ensure the transport of an electrolytic cell anode connector, the placing and fixing thereof on an anode frame for ensuring the electrical contact between the anode rod and the anode frame, or its removal, the handling member being arranged such that the risk of accidental fall of said connector during its handling is as low as possible.
  • the locking of the connector in the handling member is not dependent on the connector clamping-loosening device, and can therefore be used for handling connectors of different types, for example that do not require the actuation of a clamping screw.
  • the preferred embodiment of the invention for handling connectors provided with a clamping screw is also provided with a device for clamping / loosening the clamping screw of the connector, the latter not having to must be associated with the locking system of the connector.
  • Mobile members of US 7,344,625 which serve as safety supports for the trunnions, are here replaced by a gripping member intended to serve as a "permanent" support for said trunnions when those are in the lower position in the notches of said handling member.
  • the gripping member is moved between its open position and its closed position by means of an autonomous actuating system. In this way, the displacement of the gripping member, which is no longer dependent on the effect of cams cooperating with the upper surface of the hooks, can be performed regardless of the state, worn or deformed, of said member grasping.
  • the gripping member is also associated with a locking system that can not unlock - to allow the handling member to move from its closed position to its open position - that if the pins of the connector, introduced into the notches, are in high position.
  • the locking system comprises a movable part capable of moving between two positions: an unlocking position, where the gripping member is free to move and a locking position, where it prevents the movement of the gripping member, towards its open position if it is in the closed position and towards its closed position if it is in the open position.
  • the locking position is reached by said movable part when it comes into contact with a journal and is driven by said journal in its stroke towards its upper position.
  • This movable part can move by pivoting about an axis integral with the connector of the handling member or being guided in translation by a sliding type connection.
  • said locking system is associated with an actuator which, when said pin is not in the raised position, passes said movable part from its unlocking position to its locking position.
  • Said actuator is an elastic means, typically a compression spring, whose stiffness is sufficiently small so that the movable portion of the locking system can be driven by said pin in its movement to its upper position.
  • the upper position of the trunnions can only be reached by moving down the handling member, the connector being fixed, typically resting on the support hooks of the anode frame.
  • the actuating system of the gripping member is a cylinder, typically pneumatic, comprising a rod whose two ends of the race respectively correspond to said open position and to said closed position.
  • positioning sensors are provided to locate the position of the moving part of the locking system, so as to avoid the implementation of the actuating system when the locking system is in the locking position (redundant security).
  • the gripping member comprises two flanges, each associated with a pin and driven by the same actuating system.
  • the locking system advantageously comprises two locking devices, each associated with a trunnion.
  • Said gripping member is advantageously a pivoting member, preferably a set of pivoting flanges, whose outer contour, in a plane perpendicular to the pivot axis, has a tenon or mortise type relief, which cooperates with a relief locking device, and a protrusion, which forms an obstacle to the entry of the notch, when said gripping member is in the closed position, and which typically has a concavity capable of forming a seat on which can rest the trunnion.
  • the overall shapes in C or L are well adapted to this pivoting member but other more compact shapes, such as that presented in Example 4, may also be suitable.
  • the movable part of the locking system is advantageously provided with two walls which, when said movable part is in the locking position, form stops to move said relief of the gripping member: a stop wall at the opening which opposed to the movement of said relief when said gripping member has to move from its closed position to its open position and an abutment wall to the closure which opposes the displacement of said relief when said gripping member has to move from its open position to its position closed.
  • the invention also relates to a lifting and handling unit comprising at least one connector handling member according to the invention.
  • the invention also relates to the use of the handling device according to the invention in an aluminum production plant by igneous electrolysis.
  • the invention also relates to the use of the lifting unit and handling according to the invention in an aluminum production plant by igneous electrolysis.
  • Electrolysis plants for the production of aluminum comprise one or more electrolysis rooms (100) having a large number of electrolysis cells (1) normally arranged in rows or rows (typically side by side or head to head ), each row or file typically having one or more hundreds of cells.
  • an electrolysis cell (1) comprises a tank (2), adapted to contain the liquid metal and the electrolyte bath, a superstructure (3) and anodes (8), typically precooked anodes.
  • the superstructure (3) comprises a fixed gantry (4) and a moving metal anode frame (5).
  • the anodes (8) are provided with a metal rod (9) for fixing and electrical connection of the anodes (8) to the anode frame (5).
  • the superstructure (3) also comprises at least one jack (not shown) coupled to the anode frame (5) by connecting rods (6) and levers (7).
  • the anode frame (5) can be moved vertically (upwards or downwards) under the action of the cylinder (s).
  • the anode rods (9) are fixed to the anode frame (5) by connectors such as the one illustrated in FIG. figure 3A .
  • This connector (200) comprises two levers (201, 202) able to articulate around a common axis (213), clamping means (205, 206, 210, 211) for articulating said levers (201, 202) and two side journals (212, 212 ') disposed on each side of the connector.
  • the lateral journals (212, 212 ') generally form the common axis (213) and are typically constituted by the ends of a rod which passes through the connector from one side.
  • Said journals (212, 212 ') are intended to rest in the recess (11, 11') of the hooks (10, 10 ') fixed to the anode frame (5) and located on either side of each anode rod (9).
  • a connector (200) has at least one first state, called a tight state, and a second state, called a loose state.
  • the tightening state allows either to fix the anode rod (9) on the anode frame (5), or to release the anode rod (9): in the tightened state, the connector (200) applies pressure against the anode rod (9) and the plate on the anode frame (5); in the loosened state, the connector (200) no longer applies pressure against the anode rod (9), so that the connector and the anode can be removed.
  • a connector (200) can pass between the two clamping states by actuating the clamping means (205, 206, 210, 211).
  • These means typically comprise a screw (210) adapted to cooperate with an outer clamping member, generally attached to a handling member (300).
  • the clamping screw (210) is typically provided with a head (211) adapted to be inserted into the clamping member, which is actuated for clamping or loosening the connector (200).
  • the clamping means also comprise nuts (205, 206) fixed to the levers (201, 202) of the connector, preferably movably, and adapted to cooperate with the screw (210) so as to allow the articulation of the levers ( 201, 202) and the tightening / loosening of the connector (200).
  • the levers (201, 202) of a connector (200) generally comprise crosspieces (203, 204) intended in particular to communicate, directly or indirectly, the clamping pressure of the connector against the anode rods.
  • the electrolysis rooms (100) generally comprise at least one lifting and handling unit, called “service machine” (20), and subsequently designated under the symbol “MSE”.
  • Said unit (20) typically comprises a traveling crane (21) able to be moved along the electrolysis cells on treads (23, 23 '), a trolley (22) able to move on the crane ( 21), and handling and intervention members (30), often referred to as “tools”, such as a handling member (300) for the anode connectors (200).
  • the handling member (300) typically comprises a plate (301) fixed to the end of a movable vertical arm (24), for example the last segment of a telescopic arm, itself secured to a door turret tool pivoting about a vertical axis integral with the carriage (22).
  • Examples 1 to 4 illustrate four embodiments of the connector handling member according to the invention, which differ essentially by the shape given to the gripping member and by the locking system.
  • the first example is a connector handling member (300) which is mounted on the end of a telescopic arm via a mounting plate (301).
  • Said handling member comprises a guide member (30) which has a notch (40) associated with each of said trunnions and wherein said trunnion is intended to move.
  • a pneumatic cylinder plays the role of the actuating system (311) associated with said gripping member, able to move it between said open and closed positions.
  • An L-shaped pivoting latch (320) is the movable part of the locking system (32). It has a locked position and an unlocked position, adapted to block the gripping member (31) when in the locked position.
  • the pivot axis (322) of said latch is substantially at the intersection of the two branches of the L, the first leg (321) of the substantially horizontal L, being intended to come into contact with said pin when it moves from its lower position to its upper position and to be driven by said pin, pivoting the latch to its unlocked position.
  • the second branch (325) of L substantially vertical, is provided with a protrusion that cooperates, when said latch is in the locked position, with a raised portion (313) of the gripping member (31) so that it opposes any movement of said gripping member, regardless of its original position, open or closed: its bottom wall (324) forms a stop closure, its upper wall (323) forms stop at the opening .
  • the latch (320) When the handling member (300) is provided with a connector and moves in order to deposit it on the support hooks of the anode frame, the latch (320) is in the locked position and blocks the gripping member ( 31) in a closed position, imprisoning the connector pins.
  • the journals are in the low position, in contact with the gripping member ( Fig. 4d ).
  • the handling member is lowered until the pins rest on said support hooks.
  • the journals move and reach their high position where, coming into contact with the horizontal portion of the latch, they rotate said latch by moving it from its locking position to its position of unlocking ( Fig. 4c ), thus allowing the gripping member to move towards its open position ( Fig. 4b ) and the handling member to release itself from the connector that it was carrying ( Fig. 4a ).
  • the handling member (300) When the handling member (300) is empty and is moved to seize a connector resting on the support hooks of the anode frame and extract it from this position, the gripping member is held in the open position. Arrived above the connector ( Fig. 4a ), which rests on the support hooks, the handling member is lowered until the pins are introduced into said notches and reach their upper position ( Fig. 4b wherein, in contact with the horizontal portion of the latch, they rotate said latch from its locked position to its unlocked position, thereby allowing the gripper to move from its open position to its closed position to imprison said trunnions ( Fig. 4c ). The handling member is then reassembled so that the pins arrive in the lower position, which corresponds to the contact with the gripping member. By continuing the upward movement, the connector is driven by the gripping member, the journals resting on said gripping member ( Fig. 4d ).
  • An actuator (34) moves the locking system (32) from its unlocked position to its locked position when the journal is not in the up position.
  • Said actuator is a spring (340), connecting a fixed point of the handling member to a point of the substantially vertical leg L. The stiffness of the spring is low enough so that the latch can pivot when the pin comes into contact with the substantially horizontal part.
  • the gripping member (31) comprises two pivoting flanges, each associated with a trunnion and animated by a jack to move from the open position to the closed position and vice versa.
  • Said flanges pivot about an axis (302). They have a C-shaped contour, with a tenon-like relief (313) which cooperates with the upper wall (323) and the lower wall (324) of the latch (320) and with a protuberance (314) which forms an obstacle to the inlet of the notch, when said gripping member is in position closed.
  • the protrusion (314) has a concavity (312) adapted to form a seat on which can rest the trunnion.
  • the second example differs from the first example essentially by the latch (320 ').
  • the latter is also an L-shaped pivoting latch, with a very short vertical branch, connected to a compression spring (340 ') and a substantially horizontal branch provided with a notch having a stop wall (323') to the opening and provided at its end with a wall (324 ') of abutment closure.
  • the finger (313 ') of the flange (310') of the gripping system (31) cooperates with said stop wall at the opening to maintain the locking system (31) in the locked position, said flange being locked in the closed position .
  • the finger (313 ') cooperates with said closing stop wall (324') to keep the locking system (31) in the locking position, the flange (310 ') of the gripping system (31) being locked in position opened.
  • the third example differs from the first example also by the latch (320 "), which is not pivoting: it moves vertically, guided by a sliding connection (322"). Its high end is connected to a compression spring (340 ") which tends to push it to a low position, in which the stop wall at the opening (323") and the closing stop wall (324 ") play with the finger (313 ") of the flange (310") roles similar to those described in the previous example.
  • the fourth example differs from the previous examples in the more compact shape of the flanges (310 "') of the gripping system (31)
  • the latch (320"') is pivotable.
  • a compression spring (340 "') tends to push it to a low position, in which the stop wall at the opening (323"') and the closing stop wall (324 “') play with the finger.
  • (313 "') of the flange (310"') roles similar to those described in Examples 2 and 3 above.
  • the displacements of the flanges (310 "') of the gripping system (31) are less ample, the seat (312"') offered to the trunnions is less extensive but the associated protuberance (314 "') allows to trap said trunnions in the indentation.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manipulator (AREA)
  • Load-Engaging Elements For Cranes (AREA)
EP11761648.2A 2010-09-08 2011-09-06 Organe de manutention securisee de connecteurs de cellules d'electrolyse destinees a la production d'aluminium Not-in-force EP2614178B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1003568 2010-09-08
PCT/FR2011/000492 WO2012032234A1 (fr) 2010-09-08 2011-09-06 Organe de manutention securisee de connecteurs de cellules d'electrolyse destinees a la production d'aluminium

Publications (2)

Publication Number Publication Date
EP2614178A1 EP2614178A1 (fr) 2013-07-17
EP2614178B1 true EP2614178B1 (fr) 2017-04-05

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EP11761648.2A Not-in-force EP2614178B1 (fr) 2010-09-08 2011-09-06 Organe de manutention securisee de connecteurs de cellules d'electrolyse destinees a la production d'aluminium

Country Status (8)

Country Link
US (1) US8888156B2 (ru)
EP (1) EP2614178B1 (ru)
CN (1) CN103080383A (ru)
AU (1) AU2011300604B2 (ru)
CA (1) CA2807888C (ru)
RU (1) RU2587103C2 (ru)
WO (1) WO2012032234A1 (ru)
ZA (1) ZA201301122B (ru)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2989693B1 (fr) * 2012-04-24 2015-06-12 Rio Tinto Alcan Int Ltd Connecteur de prechauffage
DE102013206955A1 (de) 2013-04-17 2014-11-06 Würth Elektronik eiSos Gmbh & Co. KG Kommunikationseinrichtung
FR3016894B1 (fr) * 2014-01-27 2017-09-01 Rio Tinto Alcan Int Ltd Cuve d'electrolyse comportant un ensemble anodique contenu dans une enceinte de confinement
FR3016891B1 (fr) * 2014-01-27 2017-08-04 Rio Tinto Alcan Int Ltd Dispositif de stockage d'une charge au-dessus d'une cuve d'electrolyse.
FR3032453B1 (fr) * 2015-02-09 2022-01-21 Rio Tinto Alcan Int Ltd Ensemble anodique et cuve d'electrolyse destinee a la production d'aluminium liquide comprenant cet ensemble anodique, aluminerie comprenant cette cuve et procede de mise en place d'un ensemble anodique dans cette cuve
US9630810B1 (en) * 2016-03-04 2017-04-25 Volvo Truck Corporation Hook for a hoist system
NO343337B1 (en) * 2017-05-29 2019-02-04 Norsk Hydro As Device for gripping an anode for lifting operations and method for operating same
US11591703B2 (en) * 2017-09-18 2023-02-28 Boston Electrometallurgical Corporation Systems and methods for molten oxide electrolysis
FR3093737B1 (fr) * 2019-03-14 2023-02-24 Rio Tinto Alcan Int Ltd Dispositif de manutention destiné à convoyer un outil d’intervention sur une cuve d’électrolyse.
FR3093736B1 (fr) * 2019-03-14 2021-02-19 Rio Tinto Alcan Int Ltd Outil d’intervention pour l’exploitation d’une cuve d’électrolyse
EP4079939A1 (de) * 2021-04-22 2022-10-26 Reel GmbH Anodenklammer sowie sicherungsanordnung
EP4293141A1 (en) 2022-06-13 2023-12-20 Dubai Aluminium PJSC Anode servicing assembly for an aluminium electrolysis plant, and methods for operating the same

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Also Published As

Publication number Publication date
CA2807888A1 (fr) 2012-03-15
ZA201301122B (en) 2014-04-30
RU2013115288A (ru) 2014-10-20
EP2614178A1 (fr) 2013-07-17
CN103080383A (zh) 2013-05-01
AU2011300604A1 (en) 2013-03-14
AU2011300604B2 (en) 2014-03-06
CA2807888C (fr) 2018-05-22
US8888156B2 (en) 2014-11-18
WO2012032234A1 (fr) 2012-03-15
US20130181468A1 (en) 2013-07-18
RU2587103C2 (ru) 2016-06-10

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