Handling equipment for transporting intervention tools on electrolytic cells

Abstract

A handling device for conveying an intervention tool so as to be able to carry out an intervention on an electrolytic cell. The handling device (1) comprises a chassis (10) carrying an intervention tool (2) and displacement means allowing the chassis (10) to be moved, in particular along a superstructure of an electrolytic cell (3). Furthermore, the displacement means are adapted to be supported on the superstructure.

Description

[0001] This invention relates to a transport device designed for conveying an intervention tool on an electrolytic cell. The invention also relates to an intervention device comprising the transport device and the intervention tool on an electrolytic cell, an electrolytic cell comprising the transport device, and an aluminum smelter comprising the electrolytic cell. Finally, the invention relates to a method for intervening in the electrolytic cell.

[0002] The industrial production of aluminum from alumina via electrolysis using the Hall-Héroult process is well-known. For this purpose, rectangular electrolytic cells, such as… Figure 1 As shown, the conventional configuration includes: a steel tank shell 31, in which a refractory material coating is laid; a carbonaceous cathode 33, which is traversed by a cathode conductor designed to collect the electrolytic current at the cathode 33 and conduct it to a cathode outlet passing through the bottom or side of the tank shell; and an electrolytic bath 35 in which alumina is dissolved.

[0003] The electrolytic cell includes a plurality of anode assemblies 38, each anode assembly including a generally vertical anode rod 36 and an anode 37 formed by at least one anode block suspended from the anode rod 36 and immersed in the electrolytic bath 35. The anode 37 is more specifically a prebaked anode type with prebaked carbon blocks, i.e., roasted before being introduced into the electrolytic cell.

[0004] The electrolytic cell includes an upper structure 30 extending above a tank shell 31 to support and guide a vertically movable anode frame 34. Specifically, the upper structure 30 consists of at least one beam extending longitudinally above the tank shell 31 and supported by legs arranged at the transverse edges of the tank shell 31. Typically, the upper structure 30 also includes means for extracting tank gases and equipment for supplying alumina. An anode assembly 38 is suspended from the anode frame 34 along two rows at regular intervals by means of a removable connector 32 that presses an anode rod 36 against the anode frame 34. An electrical conductor 39 for increasing the electrolytic current carrying the electrolytic current from the cathode outlet of the previous electrolytic cell to the anode frame 34 extends obliquely upward from the longitudinal edge of the tank shell 31.

[0005] As the electrolysis reaction proceeds, the anode block is consumed, and the anode assembly 38 gradually moves towards the cathode 33 to maintain a relatively constant distance between the lower surface of the anode 37 and the cathode 33.

[0006] The displacement of the anode assembly 38 is collective because all anode assemblies 38 attached to the same anode frame 34 are displaced simultaneously due to the displacement of the anode frame 34.

[0007] To ensure proper operation of the electrolytic cell, the anode assemblies 38 are typically positioned such that the lower surfaces of their anodes 37 coincide in a reference plane, specifically with the plane containing the lower surfaces of the other anodes 37 of the electrolytic cell (also known as the anode plane).

[0008] However, sometimes when some anodes 37 are placed in the cell, they wear faster or slower than adjacent anodes 37, slightly slip, or are improperly positioned, causing their lower surfaces to no longer be contained within the anode reference plane. This can lead to electrolytic cell performance problems or adverse operational issues, such as short circuits. The corresponding anode assembly 38 must be advantageously repositioned so that the lower surface of the anode 37 is once again within the anode reference plane. This individualized repositioning of the anode assembly 38 is also known as anode height adjustment. Such adjustments are not permitted in the anode frame 34, which collectively supports and shifts multiple anode assemblies 38.

[0009] To overcome this difficulty, it is well known to equip each anode assembly 38 with an actuator that allows it to move independently. However, such an individual motorization solution is relatively expensive and not easily implemented in pre-existing aluminum smelters.

[0010] Another known solution is to use a circulating transport crane (also known as a cell management machine) in the electrolysis workshop above the electrolytic cells, guided by an operator to reposition improperly positioned anode assemblies. For this purpose, the electrolysis service machine circulating in the electrolysis workshop above the electrolytic cells includes a screw-driven machine to tighten and loosen a removable connector, which works in conjunction with a clamping arm to allow clamping of the anode bar, typically via its upper end, and to reposition the anode assembly by raising or lowering it. However, the number of electrolysis service machines in an aluminum smelter is limited, and multiple operations require these machines, thus limiting their availability. Furthermore, electrolysis service machines cannot traverse paths within the electrolysis workshop. Therefore, electrolysis service machines cannot be used as part of a process for continuous improvement involving the periodic repositioning of anode assemblies.

[0011] Generally, document FR3024466 discloses a vehicle for operating electrolytic cells, which can move from one electrolytic cell to another to perform interventions therein. However, this vehicle circulates in channels for the movement of other vehicles used to perform various operations on the cells, or temporarily stores trays in the channels for the operation of the cells, particularly for supporting new or used anode assemblies.

[0012] Furthermore, the present invention aims to overcome all or part of these disadvantages by providing a transport device for conveying intervention tools so that they can perform interventions on the electrolytic cell, particularly for rapidly adjusting the height of the anode at a controlled cost without hindering the movement of operators or other vehicles.

[0013] Therefore, the subject of this invention is a transport device for conveying an intervention tool to perform intervention on an electrolytic cell having a superstructure, the transport device comprising a chassis carrying the intervention tool and a displacement device adapted to allow movement of the chassis, characterized in that the displacement device is adapted to abut against the superstructure.

[0014] Therefore, intervention tools can be brought to various locations along the upper structure of the electrolytic cell by transport equipment to perform operations therein without the need for intervention by electrolysis service machines or circulation in the channels adjacent to the electrolytic cell.

[0015] The superstructure refers to the structure that supports the anode frame and any fixed elements of the electrolytic cell attached to the anode frame, such as, for example, devices for extracting cell gases and equipment for supplying alumina. For example, the superstructure includes beams extending longitudinally above the cell shell and supported by legs arranged at the transverse edges of the cell shell. The superstructure, upon which displacement devices rest, supports these displacement devices and handling equipment.

[0016] Therefore, handling equipment, in particular, can make the same intervention tools available for several anode components positioned at regular intervals along the upper structure of the electrolytic cell, thereby reducing costs.

[0017] Furthermore, according to one implementation, the intervention tool is a device capable of repositioning the anode assembly of the electrolytic cell.

[0018] Repositioning refers to adjusting the height of the anode of the anode assembly so that its lower surface is in a specific position.

[0019] Therefore, handling equipment equipped with such intervention tools offers the possibility of periodically repositioning anode components on an individualized basis, increases the availability of electrolysis service machines for other operations, and reduces development costs.

[0020] According to one embodiment, the handling equipment includes a lifting device configured to raise or lower the intervention tool between a parking position and a working position, the parking position holding the intervention tool at a distance from the electrolytic cell, and the working position lowering the intervention tool to contact the electrolytic cell.

[0021] These lifting devices may consist of jacks or articulated arms, but according to one embodiment of the invention, the lifting device is a cable lifting device.

[0022] Cable lifting devices refer to any lifting device that includes a long and flexible element designed to lower or drag a load from above, such as cables, tethers, straps, ropes, chains, or equivalents.

[0023] Since the chassis is positioned above the superstructure, that is, above the intervention area of ​​the intervention tool, it is advantageous to use a cable lifting device that is inherently simple, reliable, and inexpensive.

[0024] According to one implementation, the lifting device includes a motorized crane or a winch.

[0025] According to one implementation, the lifting device includes means for detecting when the intervention tool reaches the working position.

[0026] The height of the intervention tool in its working position depends on the height of the anode frame, which varies over time. Therefore, the descent of the intervention tool can be controlled to stop when it contacts and presses against the anode frame or a pool element fixed relative to the anode frame (such as a connector, connector shaft, or hook formed on the anode frame to support the connector). The detection device can be a contact sensor or an optical sensor.

[0027] According to one embodiment, the handling equipment includes a guiding device configured to guide the intervention tool according to a predetermined path from the parking position to the working position.

[0028] This feature allows intervention tools to be precisely applied to the intervention area.

[0029] According to one embodiment, the guiding device includes two parallel flanges, with the intervention tool extending between the two parallel flanges in a parking position, each flange including a groove designed to receive and guide elements attached to the intervention tool.

[0030] These flanges ensure robust and efficient guidance, preventing any tilting or improper gaps.

[0031] According to one embodiment, the handling equipment includes a retaining member designed to prevent the chassis carrying the intervention tool from tilting on either side of the superstructure.

[0032] This allows for the safe reduction or increase of intervention tools.

[0033] According to one implementation scheme, the handling equipment carries two intervention tools arranged on opposite sides of the chassis.

[0034] This allows for balancing of the mass at the handling equipment and each electrolytic cell has two available intervention tools, each designed to intervene on one half of the electrolytic cell. Therefore, the operational efficiency of the electrolytic cells and the aluminum smelter is improved.

[0035] Alternatively, the handling equipment carries a single intervention tool arranged on a rotating platform positioned on a chassis.

[0036] Therefore, the same tools can be used advantageously on both sides of the electrolytic cell.

[0037] According to one implementation, the displacement device allows the chassis to be moved along the upper structure of the electrolytic cell.

[0038] According to one implementation plan, the chassis moves above the superstructure.

[0039] According to a second aspect, the subject of the invention is an intervention device on an electrolytic cell, the intervention device comprising a handling device and an intervention tool having the above-described features, the intervention tool comprising a mounting member provided with one or more support surfaces, allowing the intervention tool to be abutted against and directly and stably supported on at least one element of the electrolytic cell in a working position.

[0040] When the intervention tool is in the working position, particularly during intervention in the cell, this feature makes it possible for the electrolytic cell to act as a support for the weight of the intervention tool. As the intervention tool reaches the working position and abuts against the cell element, the weight of the intervention tool is transferred from the transport device to at least one element of the electrolytic cell. Therefore, the transport device is not subjected to mechanical forces from the intervention tool when it is in the working position and during intervention in the cell. Consequently, the transport device does not need to be sized to withstand significant mechanical stress, which reduces associated design and transport costs. Furthermore, there is no risk of tilting when the tool is in the working position, particularly during intervention in the cell.

[0041] According to one embodiment, the mounting of the intervention tool includes a reversible fastening device adapted to create a reversible attachment between the mounting and at least one element of the electrolytic cell. Therefore, when the intervention tool is in its working position, pressed against at least one element of the cell, the intervention tool can also be attached to at least one element of the cell to further improve the stability of the intervention tool on the cell and increase the stress level that the intervention tool may experience during intervention on the cell.

[0042] According to one embodiment, the intervention tool includes a movable component relative to the mounting and a displacement device for translating the movable component relative to the mounting. The movable component includes an engagement device configured to engage an anode rod of an anode assembly of an electrolytic cell, so as to fix the anode rod and the movable component of the intervention tool during translation.

[0043] These features allow intervention tools to reposition the anode assembly for possible optimization of its vertical positioning, i.e., individualized displacement of the anode assembly, particularly to reposition the lower surface of the anode assembly within the anode plane. Based on the desired positioning of the anode assembly, the movable component can move vertically, upwards, or downwards relative to the mounting.

[0044] The intervention tool, which can move along the superstructure by means of a handling device facing each anode assembly of the pool, allows for the individual repositioning of all anode assemblies of the pool one by one as needed. The engagement device for securing the anode rods and the movable parts of the intervention tool during translation includes conventional clamping devices, such as pliers or vises that clamp the anode rods between two opposing jaw members.

[0045] According to one embodiment, the intervention tool includes a tightening / loosening device adapted to tighten / loosen the connector that holds the anode assembly in place in the electrolytic cell.

[0046] When the intervention tool is in the working position, these tightening / loosening devices are advantageously screwdrivers that engage with the threaded rod of the connector.

[0047] According to a third aspect, the subject of the present invention is an electrolytic cell comprising an upper structure, an anode frame supported by the upper structure, and a handling device having the above-described features, wherein the upper structure includes a surface on which a displacement device rests.

[0048] Therefore, the handling equipment, designed as a transport intervention tool, moves on the electrolytic cells rather than in the passageways serving them. This reduces congestion in the electrolysis plant and improves safety.

[0049] All electrolytic cells in an aluminum smelter can be equipped with handling equipment, allowing intervention tools to move and thus intervene in different areas of each electrolytic cell without causing harmful congestion in the working passages adjacent to the electrolytic cells or mobilizing electrolysis service machines.

[0050] According to one implementation, the surface on which the displacement device rests is the upper surface of the superstructure.

[0051] This implementation is the simplest because the superstructure typically has an upper surface that extends along the entire length of the electrolytic cell.

[0052] According to one embodiment, the superstructure and / or displacement device form a displacement path for the chassis at least along the entire length of the anode frame.

[0053] Therefore, the intervention tool carried by the handling equipment can be moved and brought to the intervention location close to all anode components supported by the anode frame.

[0054] According to one implementation, the displacement path presents a storage track at one end of the electrolytic cell.

[0055] This allows transport equipment to clear the space above the anode frame, such as space for passage or intervention by electrolysis service machines.

[0056] According to one embodiment, the displacement device includes a guiding device designed to guide the chassis translationally in the longitudinal direction of the electrolytic cell.

[0057] These guiding devices ensure the precise positioning of the transport equipment on the superstructure, and specifically can be guide rails that form a movement path and engage with wheels arranged on the chassis.

[0058] According to one embodiment, the displacement device includes a drive mechanism configured to move the chassis along the superstructure.

[0059] The handling equipment can move autonomously on the upper structure of the electrolytic cell.

[0060] According to a fourth aspect, the present invention relates to an aluminum smelter comprising at least one electrolytic cell having the above-described features.

[0061] According to a fifth aspect, the subject of the present invention is a method for intervening in an electrolytic cell having the above-described characteristics, comprising the following steps:

[0062] - To shift the chassis.

[0063] - Move the intervention tool from its parking position to its working position.

[0064] - Intervene the electrolytic cell using the aforementioned intervention tool.

[0065] - Move the intervention tool from its working position to its parking position.

[0066] According to one specific implementation, the intervention in the electrolytic cell involves the repositioning of the anode assembly and includes the following steps:

[0067] - Engage the intervention tool with the anode rod of the anode assembly to be repositioned.

[0068] - Loosen the electrolytic cell connector to release the anode rod.

[0069] - Displace the anode assembly such that the lower surface of the anode assembly is brought to a predetermined position.

[0070] - Tighten the connector.

[0071] -Disconnect the intervention tool from the anode rod.

[0072] - Move the intervention tool to the parking position.

[0073] Other features and advantages of the invention will become apparent from the following detailed description of embodiments given by way of non-limiting examples with reference to the accompanying drawings, in which:

[0074] [ Figure 1] Figure 1 This is a cross-sectional view of an electrolytic cell based on existing technology.

[0075] [ Figure 2 ] Figure 2 This is a perspective view of a conveying device according to one embodiment of the present invention.

[0076] [ Figure 3 ] Figure 3 This is a side view of a handling device and an electrolytic cell according to one embodiment of the present invention.

[0077] [ Figure 4 ] Figure 4 This is a perspective view of a portion of an electrolytic cell according to one embodiment of the present invention.

[0078] [ Figure 5 ] Figure 5 This is a perspective view of a conveying device according to one embodiment of the present invention.

[0079] [ Figure 6 ] Figure 6 This is a perspective view of a portion of a transport device and a portion of an electrolytic cell according to one embodiment of the present invention.

[0080] [ Figure 7 ] Figure 7 This is a side view of a portion of an electrolytic cell according to one embodiment of the present invention.

[0081] [ Figure 8 ] Figure 8 This is a side view of a conveying device according to one embodiment of the present invention.

[0082] [ Figure 9 ] Figure 9 yes Figure 8 The side view of the intervention tool after the movable part has been vertically displaced.

[0083] [ Figure 10 ] Figure 10 This is a perspective view of a portion of the intervention tool of a handling device according to one embodiment of the present invention.

[0084] [ Figure 11 ] Figure 11 This is a perspective view of a conveying device and an electrolytic cell according to one embodiment of the present invention.

[0085] [ Figure 12 ] Figure 12 This is a perspective view of a conveying device and an electrolytic cell according to one embodiment of the present invention.

[0086] [ Figure 13 ] Figure 13This is a side view of a handling device and an electrolytic cell according to one embodiment of the present invention.

[0087] [ Figure 14 ] Figure 14 This is a top view of a handling device and an electrolytic cell according to one embodiment of the present invention.

[0088] Figure 2 A transport device 1 on an electrolytic cell according to one embodiment of the present invention is shown. The transport device 1 is intended to transport one or more intervention tools 2 to collectively form an intervention device. Each intervention tool 2 is intended to perform one or more operations on the electrolytic cell 3, such as the repositioning of the anode assembly as will be described in more detail below.

[0089] Figure 3 The conveying device 1 is shown to be advantageously designed to transport two intervention tools 2. Where appropriate, each intervention tool 2 is designed to intervene in half of the electrolytic cell 3.

[0090] refer to Figure 2 and Figure 3 The handling equipment 1 includes a chassis 10 and a displacement device for moving the chassis 10 along the upper structure 30 of the electrolytic cell 3.

[0091] The chassis 10 extends longitudinally along the transverse axis X and is designed to extend parallel to the transverse direction of the electrolytic cell 3. The chassis 10 can be a support plate or a platform. Figure 2 ) or even beam ( Figures 12 to 14 (in the form of ).

[0092] When the handling equipment 1 carries two intervention tools 2, the two intervention tools 2 are advantageously positioned on opposite sides of the chassis 10 along the transverse axis X.

[0093] The transfer device supports the chassis 10. The transfer device is configured to abut against a surface 300, which is advantageously the upper surface of the superstructure 30, and is configured to allow the transport device 1 to translate along a transfer path defined by the upper surface 300 of the superstructure 30 in the longitudinal direction of the electrolytic cell 3.

[0094] refer to Figure 2 , Figure 3 , Figure 5 and Figures 12 to 14 The displacement device may include wheels or rollers 12 rotatably mounted on the chassis 10 about a transverse axis X. The displacement device may also include guiding devices, such as guide rails 41 attached to, for example, the superstructure 30, which are designed to cooperate with the wheels or rollers 12.

[0095] The moving device of the transport equipment 1 may include a drive mechanism, such as a motor that can be mounted on the chassis 10 to allow the transport equipment 1 to move along the superstructure 30 in the longitudinal direction Y of the electrolytic cell 3. Alternatively, as Figure 4 As shown, the transfer device may include a motor 42 and a transmission component 44 arranged on the superstructure 30, such as a chain actuated by the motor 42 and attached to the chassis 10. The motor 42 may be arranged at one end of the transfer path, for example at the height of the storage track 40.

[0096] refer to Figure 5 The chassis 10 advantageously includes one or more retaining members 14 designed to prevent the transport device 1 from tilting on one or the other side of the superstructure 30. The retaining member 14 may be an L-shaped tab or hook intended to engage below the surface of the superstructure 30, for example, below the guide head 41, to prevent vertical lifting of the chassis 10 of the transport device 1 relative to the superstructure 30.

[0097] The handling equipment 1 may include a lifting device. The lifting device is configured to be in the parking position ( Figure 2 and Figure 3 The right side; Figure 12 ; Figure 13 and Figure 14 (left side) and work position ( Figure 2 and Figure 3 The left side; Figure 6 ; Figure 13 and Figure 14 The intervention tool 2 is moved individually between the right side of the electrolytic cell 3. In the parking position, the intervention tool 2 is a distance away from the electrolytic cell 3 to allow it to be conveyed along the electrolytic cell 3. In the working position, the intervention tool 2 is lowered to contact the electrolytic cell 3 in order to perform a predetermined operation, such as anode repositioning. In the parking position, the intervention tool 2 is close to or in contact with the chassis 10. In the working position, the intervention tool 2 is away from the chassis 10, at a greater distance than in the parking position.

[0098] refer to Figure 2 , Figure 3 , Figure 6 and Figures 12 to 14For each intervention tool 2, the lifting device advantageously includes a winch 100 with a motor (e.g., an electric motor) having a cable 102 designed to connect to the intervention tool 2. The cable 102 may include a lifting beam 104. The lifting device may also include one or more return pulleys 106, which may be arranged above a horizontal plane including the chassis 10. For example, the pulleys 106 are rotatably mounted on a support arm 108 about a longitudinal axis Y, which extends from and above the chassis 10. The winch or multiple winches 100 are advantageously positioned above a track defined by a displacement device, at the center of the chassis 10. Alternatively, the lifting device may consist of jacks or articulated arms.

[0099] refer to Figure 2 , Figure 3 and Figure 6 For each intervention tool 2, the handling device 1 includes a guiding device configured to guide the intervention tool 2 according to a predetermined path (e.g., an inverted L-shaped path) from the parking position toward the working position.

[0100] The guiding device may include a groove 16 designed to receive and guide the rotating shaft or roller 20 of the intervention tool 2. The groove 16 may be formed on two parallel flanges 18 that connect to the chassis 10 and define a space between them designed to receive the intervention tool 2 in a parked position. Each groove 16 preferably includes a lower portion 160 and an upper portion 162, the lower portion advantageously extending along a vertical axis Z orthogonal to the longitudinal axis Y and the transverse axis X, substantially below or flush with the horizontal plane containing the displacement device, the upper portion extending obliquely relative to the lower portion 160 at or above the horizontal plane containing the chassis 10 or the displacement device for transporting the equipment 1. The upper portion 162 preferably extends outward from the vertical lower portion 160, that is, away from the chassis 10 and the electrolytic cell 3. In the parking position, the rotating shaft or roller 20 of the intervention tool 2 is located in the upper portion 162 of the groove, while in the working position, the rotating shaft or roller 20 of the intervention tool 2 is located in the lower portion 160 of the groove. Preferably, each flange 18 includes two similar and parallel grooves 16. These double grooves 16 prevent the intervention tool 2 from tilting about the rotating shaft or roller 20 placed in the groove 16.

[0101] The handling device 1 may include means for supporting each intervention tool 2 in a parking position. Thus, the intervention tool 2 is at least partially pressed against these supporting means. The supporting means may be the sidewall of the groove 16 of the flange 18.

[0102] The handling device 1 may include a wired supply device of the type of cable or pneumatic hose, and an automatic reel designed to supply lifting devices and / or motors, enabling them to move the handling device 1 on the superstructure 30. The automatic reel is designed to wind around the wired supply device. Alternatively or additionally, the handling device 1 may carry one or more energy storage units, such as batteries.

[0103] Each intervention tool 2 is connected to the transport equipment 1 via cable 102 and the guide device described above.

[0104] refer to Figure 7 The intervention tool 2 includes a mounting member 22 provided with one or more support surfaces 220, allowing the intervention tool 2 to be pressed against and directly and stably supported in the working position against at least one element of the electrolytic cell 3, more specifically, against an element fixed relative to the anode frame 34, such as a connector 32, a pin 320 of the connector 32, the anode frame 34, or a hook 322 supporting the connector 32. For example, the mounting member 22 includes a support surface 220a designed to press against the upper surface of the anode frame 34, and / or a support surface 220b designed to press against the side of the anode frame 34, and / or a support surface 220c corresponding here to the bottom of the notch 222 and designed to press against the shaft 320 of the connector 32. The support surfaces 220 are configured to allow the intervention tool 2 to be stably pressed against the electrolytic cell 3 by gravity and, if necessary, fully supported by the electrolytic cell 3.

[0105] Mounting member 22 may also include a reversible fastening device designed to create a reversible attachment between mounting member 22 and at least one element of electrolytic cell 3. The reversible fastening device may include one or more locking tabs that may be movable relative to mounting member 22 between a retracted position and an extended position. These locking tabs are configured to engage with elements of electrolytic cell 3 when the intervention tool 2 is in the working position, more specifically, with elements fixed relative to anode frame 34, such as connector 32, the shaft 320 of connector 32, anode frame 34, or hooks 322 supporting connector 32. Thus, the locking tabs, together with support surface 220, allow the intervention tool 2 to be attached to electrolytic cell 3.

[0106] Intervention tool 2 is advantageously designed to perform predetermined operations on electrolytic cell 3, such as, for example, repositioning of the anode. In this case, intervention tool 2 may include engagement devices that allow the anode rod 36 of the anode assembly 38 of electrolytic cell 3 to be held in place, and means for driving these engagement devices to translate so as to vertically displace the anode assembly 38. More specifically, intervention tool 2 includes a movable part 24 that translates relative to mounting member 22, and a drive mechanism for driving the movable part 24 to translate relative to mounting member 22 along the vertical axis Z, the movable part 24 supporting the engagement devices. The movable part 24 and mounting member 22 may be connected by a sliding guide 26. These features allow the anode assembly 38 to be moved a relatively short distance, approximately 100 mm, by raising or lowering it, but this is sufficient to reposition the lower surface of the anode block of the anode assembly 38 to a desired position, for example, in the anode plane.

[0107] refer to Figure 10 The engagement device can be a clamping device that can clamp the anode rod 36 and includes a vertical screw 200 with a reverse pitch double thread, two cams 202, a pair of upper jaws 204, and a pair of lower jaws 206. Each cam 202 engages with one of the threads of the vertical screw 200 such that rotation of the screw 200 causes the cam 202 to move closer or further away. Each upper jaw 204 is rotatably connected to one of the lower jaws 206. Each cam 202 is engaged in a cavity 208 of either the upper jaw 204 or the lower jaw 206. Therefore, rotation of the threaded rod 200 in one direction or the other causes the cams 202 to move closer or further away, resulting in tightening or widening of the upper jaws 204 and the lower jaws 206, thereby securing the movable part 24 of the intervention tool 2 to the anode rod 36.

[0108] refer to Figure 8 and Figure 9 The means for driving the movable part 24 relative to the mounting 22 may include one or more helical (preferably trapezoidal) jacks 240, which may be actuated by an electric motor 242. Figure 8 In the middle, jack 240 is in the retracted position, while... Figure 9 In the middle, jack 240 is in the extended position. Before the step of engaging the anode rod 36 by the clamping device, the position of jack 240 may depend on the displacement direction required to reposition the anode assembly 38, i.e., the lifting or lowering of the anode assembly 38.

[0109] refer to Figure 2 or Figure 3The intervention tool 2 advantageously includes means for tightening / loosening the connector 32 of the electrolytic cell 3. The connector 32 may be of the type including a rotary lever actuated by a threaded rod 324, as disclosed in patent document WO2013159218. The tightening / loosening means of the intervention tool 2 may include a screwdriver 28 designed to engage and pivot the threaded rod 324 of the connector 32 in one or the other direction to loosen or tighten the clamping applied to the anode rod 36 by the connector 32 and the anode frame 34. The tightening / loosening means is provided on the mounting 22 to engage with the corresponding part of the connector 32 when the intervention tool 2 is positioned in the working position, and to maintain this engagement during intervention, particularly when the movable part 24 of the intervention tool 2 is displaced relative to the mounting 22.

[0110] The conveying device 1, more specifically, the lifting device advantageously includes a detection device, such as, for example, a contact or optical sensor 11, in... Figure 8 and Figure 9 The diagram schematically illustrates how this enables the intervention tool 2 to be positioned in its working and / or parking locations.

[0111] Furthermore, the intervention tool 2 may include a wired supply device of the type of cable or pneumatic hose, and an automatic reel specifically designed to supply the drive mechanism, engagement mechanism, and / or tightening / unwinding mechanism of the intervention tool 2, and the automatic reel is designed to wind the wired supply device. Alternatively or additionally, the intervention tool 2 may carry one or more energy storage units, such as batteries.

[0112] The present invention also relates to an electrolytic cell 3, the electrolytic cell including an upper structure 30, an anode frame 34 supported by the upper structure 30, an anode assembly 38, a connector 32 for removably suspending the anode assembly 38 from the anode frame 34, and a handling device 1 as described above, the handling device 1 being capable of carrying one or more intervention tools 2.

[0113] refer to Figure 3 , Figure 7 , Figure 12 The upper structure 30 has a surface 300, specifically an upper surface, on which the displacement device rests. The upper structure 30 and / or the displacement device form a displacement path for the chassis 10 of the transport device 1 over at least the entire length of the anode frame 34 or the tank shell of the electrolytic cell 3. The surface 300 extends in a horizontal plane XY. The displacement path is advantageously straight, located at the center of the electrolytic cell 3, and symmetrical with respect to the midplane YZ of the electrolytic cell 3.

[0114] The displacement path can extend beyond the vertical protrusion of the anode frame 34 or the cell shell of the electrolytic cell 3. Specifically, as... Figure 11As illustrated, the displacement path may include a storage track 40 to store the transport equipment 1, for example without intervention, or to free up space above the electrolytic cell 3 for the passage or intervention of the electrolysis service machine. The storage track 40 is located, for example, cantilevered at one end of the displacement path and the electrolytic cell 3. Although not shown, the storage track 40 may extend in a horizontal plane below the plane of the surface 300 containing the superstructure 30 to free up more space above the electrolytic cell 3.

[0115] If necessary, the positioning of the handling device 1 on the storage track 40 can allow for the recharging of the power batteries of various equipment (such as shifting devices, lifting devices and / or intervention tools 2).

[0116] It should be noted that the electrolytic cell 3 or the transport device 1 may advantageously include means for controlling the position of the transport device 1, such as an encoder mounted in the motor 42 designed to drive the transport device 1, and sensors for the zero point (e.g., the first end of the displacement path, such as the storage track 40) and the end of the journey (e.g., the second opposite end of the displacement path).

[0117] Alternatively, markers and associated detectors can precisely determine the stops of the chassis 10 facing the anode assembly 38, the stops being consistently positioned and regularly spaced, such as... Figure 14 As shown.

[0118] Furthermore, although not shown, the electrolytic cell 3, the handling equipment 1, or the intervention tool 2 may be equipped with wired or wireless communication devices known to those skilled in the art for communicating with a control unit located within the aluminum smelter and designed to control the movement and operation of the handling equipment 1 and the intervention tool 2.

[0119] The present invention also relates to an aluminum smelter comprising a plurality of electrolytic cells 3, said plurality of electrolytic cells 3 including at least one electrolytic cell 3 as described above. Preferably, all the electrolytic cells 3 of the aluminum smelter have the above-described features. The aluminum smelter may include one or more electrolysis service machines designed to move above a conveying device 1 present on a shifting path of the superstructure 30.

[0120] Furthermore, the aluminum smelter or electrolytic cell 3 advantageously includes means for measuring the current flowing in each anode assembly 38, such as, for example, a Hall effect sensor, as disclosed in U.S. Patent No. 6,136,177.

[0121] The aluminum smelter may include a control unit designed to control the movement and operation of the handling equipment 1 and the intervention tool 2 based on measurements of the current circulating in each anode assembly 38 and based on received information regarding the positioning and operation of the handling equipment 1 and / or the intervention tool 2 and / or the electrolysis service machine.

[0122] Finally, this invention relates to a method for intervening in the electrolytic cell 3 as described above. This method includes the following steps:

[0123] - This causes the chassis 10 to shift onto the upper structure 30.

[0124] - Move the intervention tool 2 from its parking position to its working position.

[0125] - Intervene the electrolytic cell 3 using the intervention tool 2.

[0126] - Move the intervention tool 2 from the working position to the parking position.

[0127] The method may include an initial step of measuring the operating parameters of the cell, such as the intensity of the current circulating in each anode assembly 38.

[0128] Lowering the intervention tool 2 to the working position may include pressing the intervention tool 2 against an element of the electrolytic cell 3, more precisely, against an element fixed relative to the anode frame 34, such as connector 32, shaft 320 of connector 32, anode frame 34, or hook 322 supporting connector 32.

[0129] After lowering the intervention tool 2 to the working position, the following steps may be taken: in the working position, the intervention tool 2 is attached to the electrolytic cell 3, more precisely, to an element of the electrolytic cell 3 that is fixed relative to the anode frame 34, such as connector 32, shaft 320 of connector 32, anode frame 34, or hook 322 supporting connector 32.

[0130] Preferably, the step of performing the intervention using intervention tool 2 involves repositioning the anode assembly, such as shifting the anode assembly 38, to reposition the lower surface of the anode block in the anode reference plane. Repositioning the anode assembly may include the following steps:

[0131] - Shift the chassis 10 onto the superstructure 30 so that the chassis faces the anode assembly 38 to be repositioned.

[0132] - Move intervention tool 2 from its parking position to its working position.

[0133] - Engage the intervention tool 2 with the anode rod 36 of the anode assembly 38 to be repositioned, for example, by clamping the anode rod 36 with the intervention tool 2.

[0134] -Loosen connector 32 of electrolytic cell 3 to release anode rod 36.

[0135] - Displace the anode assembly 38 so that the lower surface of the anode block of the anode assembly 38 is brought to a predetermined position.

[0136] - Tighten connector 32.

[0137] -Disconnect the intervention tool 2 and the anode rod 36.

[0138] - Move intervention tool 2 to the parking position.

[0139] Advantageously, the release step of connector 32 is a partial release step, such that connector 32 maintains contact between anode rod 36 and anode frame 34. Tightening and loosening of connector 32 are advantageously performed by the tightening / loosening device of intervention tool 2.

[0140] The method may also include enabling the control unit of the aluminum smelter to communicate information or control signals with the handling equipment 1 and / or the intervention tool 2 and / or the electrolysis service machine in order to control their respective displacement and operation.

[0141] Obviously, the present invention is by no means limited to the embodiments described above, which are given by way of example only. Modifications can be made, particularly in terms of the composition of various devices, or by substitution with technical equivalents, without departing from the scope of protection of the present invention.

Claims

1. An intervention device for intervening in an electrolytic cell (3) having a superstructure (30), the intervention device comprising: intervention tools (2); as well as A transport device (1) for transporting the intervention tool (2), the transport device (1) comprising: a chassis (10) carrying the intervention tool (2) and movable above the superstructure (30), and displacement means adapted to allow the chassis (10) to move, wherein the displacement means are adapted to bear against the superstructure (30), and The intervention tool (2) comprises a mounting (22) provided with one or more bearing surfaces (220) to allow the intervention tool (2) to be pressed against and stably supported directly on at least one element of the electrolytic cell (3) in a working position.

2. An intervention device according to claim 1, wherein the handling device (1) includes a lifting device, which is configured to raise or lower the intervention tool (2) between a parking position and a working position, wherein the parking position is capable of keeping the intervention tool (2) away from the electrolytic cell (3), and the working position is capable of lowering the intervention tool (2) to contact the electrolytic cell (3).

3. Intervention device according to claim 2, wherein the lifting device is a cable lifting device (102).

4. Intervention device according to any one of claims 2 to 3, wherein the lifting device comprises a mobile crane or a winch (100).

5. Intervention device according to any one of claims 2 to 3, wherein the lifting device comprises means for detecting the arrival of the intervention tool (2) in the working position.

6. Intervention device according to any one of claims 2 to 3, wherein the handling device (1) comprises a guiding device configured to guide the intervention tool (2) according to a predetermined path from a parking position to a working position.

7. An intervention device according to claim 6, wherein the guiding device comprises two parallel flanges (18) between which the intervention tool (2) extends into the parking position, each flange (18) comprising a groove designed to receive and guide an element attached to the intervention tool (2).

8. An intervention device according to any one of claims 1 to 3, wherein the handling device (1) comprises a retaining member designed to prevent the chassis (10) carrying the intervention tool (2) from tilting on one side or the other of the superstructure (30).

9. Intervention device according to any of claims 1-3, wherein the handling device (1) carries two intervention tools (2) arranged on opposite sides of the chassis (10).

10. Intervention device according to any one of claims 1 to 3, wherein the handling device (1) carries a single intervention tool (2) arranged on a rotating platform located on the chassis (10).

11. Intervention device according to any one of claims 1 to 3, wherein the displacement means allow the chassis (10) to be displaced along a superstructure (30) of the electrolytic cell (3).

12. Intervention device according to claim 1, wherein the mounting (22) of the intervention tool (2) comprises reversible fixing means suitable for creating a reversible attachment between the mounting (22) and at least one element of the electrolytic cell (3).

13. An intervention device according to any one of claims 1 to 3, wherein the intervention tool (2) includes a part (24) movable relative to the mounting member (22), a displacement device for making the movable part (24) translate relative to the mounting member (22), and the movable part (24) includes a coupling device, which is configured to engage the anode rod (36) of the anode assembly (38) of the electrolytic cell (3) so as to fix the anode rod (36) and the movable part (24) in translation.

14. Intervention device according to claim 13, wherein the intervention tool (2) comprises tightening / loosening means suitable for tightening / loosening a connector (32) holding the anode assembly (38) in place within the electrolytic cell (3).

15. An electrolytic cell (3) comprising a superstructure (30), an anode frame (34) supported by the superstructure (30), and an intervention device according to any one of claims 1 to 14, wherein the superstructure (30) comprises a surface (300) against which the displacement device is pressed.

16. An electrolytic cell (3) according to claim 15, wherein the surface (300) against which the displacement device bears is the upper surface of the upper structure (30).

17. The electrolytic cell (3) according to claim 15 or 16, wherein the superstructure (30) and / or the displacement device form a displacement path for the chassis (10) at least over the entire length of the anode frame (34).

18. The electrolytic cell (3) according to claim 17, wherein the displacement path has a storage track (40) at one end of the electrolytic cell (3).

19. The electrolytic cell (3) according to any one of claims 15 to 16, wherein the displacement device comprises a guide device designed to guide the bottom plate (10) in translation in the longitudinal direction of the electrolytic cell (3).

20. An electrolytic cell (3) according to claim 19, wherein the displacement means comprises drive means configured to move the chassis (10) along the superstructure (30).

21. Aluminium smelter comprising at least one electrolytic cell (3) according to any one of claims 15 to 20.

22. A method for intervening in an electrolytic cell (3) according to any one of claims 15 to 20, comprising the following steps: - displacing the chassis (10), - moving the intervention tool (2) from a parking position to a working position, - performing an intervention on the electrolytic cell (3) using the intervention tool (2), - Displacing the intervention tool (2) from the working position to the parking position.

23. The intervention method according to claim 22, wherein the intervention on the electrolytic cell (3) is a repositioning of the anode assembly (38) and comprises the following steps: - engaging the intervention tool (2) with the anode rod (36) of the anode assembly (38) to be repositioned, - loosening the connector (32) of the electrolytic cell (3) to release the anode rod (36), - displacing the anode assembly (38) so that the lower surface of the anode assembly (38) is brought into a predetermined position, - tightening the connector (32), - the intervention tool (2) and the anode rod (36) are disengaged, - the intervention tool (2) is shifted to the parking position.

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