Hydraulic Wedge Extraction Device for Aluminum Electrolysis Cells
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Solution Overview
Problem
The existing methods for removing short-circuiting wedges in aluminum electrolysis cells require delicate human intervention, often necessitating cell shutdown, leading to performance degradation and safety concerns due to the need for manual handling and the risk of conductor damage and uncontrolled wedge ejection.
Innovation Solution
A wedge extraction device using hydraulic jacks with horizontal bearing faces and locking pins, allowing for controlled force application and wedge removal without unbolting tie rods, ensuring safe and efficient extraction without damaging conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual intervention is used to remove wedges, then flexibility and adaptability are maintained, but productivity decreases and safety risks increase due to delicate human intervention and potential conductor damage
Solution Approach 1:
The automated wedge extraction device performs the removal operation autonomously without requiring manual intervention. The device positions itself, engages the wedge, and extracts it automatically, transforming the process from a manual self-service operation to an automated self-executing system that improves productivity while maintaining operational simplicity
Solution Approach 2:
The patent replaces manual mechanical operations with an automated mechanical system. The extraction device uses mechanical components (grasping elements, positioning mechanisms) to perform the wedge removal that previously required human hands and tools, thereby increasing speed and consistency while reducing safety risks
2Reliability
If cell shutdown is performed to remove wedges, then safety is improved by eliminating current flow, but productivity deteriorates due to performance degradation from extended downtime
Solution Approach 1:
The extraction device is designed to be positioned and prepared in advance during normal cell operation. The device waits in a ready state with its components pre-configured, so that when wedge removal is needed, the action can be executed immediately without shutting down the cell, thus maintaining productivity while ensuring safety through controlled operation
Solution Approach 2:
The patent enables the wedge extraction process to occur continuously during cell operation without interruption. The automated device maintains the cell's productive operation while performing the extraction task, eliminating the need to stop the series and thereby maintaining continuous useful action throughout the process
3Productivity
If multiple wedges are removed simultaneously, then productivity is improved by reducing total extraction time, but harmful factors increase due to progressive current intensity increase and heating of remaining wedges
Solution Approach 1:
The extraction device is equipped with multiple independent extraction units that can remove multiple wedges simultaneously. Each unit operates independently with its own grasping and positioning mechanism, allowing parallel execution of extraction tasks to improve productivity while managing thermal loads through distributed operation
Solution Approach 2:
The device applies extraction force to multiple wedges at once rather than sequentially, using partial simultaneous action. This approach removes wedges in parallel groups, achieving faster overall extraction while distributing the current redistribution effect across multiple points, thereby reducing the heating impact on any single wedge compared to sequential removal
4Ease of operation
If tie rods are unbolted to facilitate wedge removal, then ease of operation is improved by reducing extraction force required, but device complexity increases due to additional unbolting steps and potential conductor damage risks
Solution Approach 1:
The extraction device incorporates pre-configured grasping elements and positioning mechanisms that are prepared in advance. The device approaches the wedge with pre-positioned extraction components already engaged or ready to engage, eliminating the need for preliminary unbolting operations and reducing procedural complexity while maintaining ease of operation
Solution Approach 2:
The patent introduces an intermediary extraction device that acts as a mediator between the wedge and the operator. This device provides the necessary extraction force through its mechanical design without requiring the operator to directly apply force or perform unbolting operations, thereby simplifying the operation while managing the forces involved through the intermediary mechanism
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables quick and controlled extraction of wedges, reducing conductor damage and safety risks, allowing for faster cell restarts while maintaining operational efficiency and safety.
Implementation Method 1
A wedge extraction device is proposed which acts on the shims without there being any need to unbolt the tie rods, which exerts a force important during the extraction of the shims
Data Source
Figure 1~2
Figure 3a~3c
AI summary
The invention relates to an extracting device (30) for extracting a short-circuiting shim inserted between two conductors (24 and 25) for switching off an electrolytic cell (2). The extracting device (30) includes a means (31) for grasping said shim and, associated with the upper horizontal surface (240, 250) of each conductor (24, 25), at least one vertically-oriented cylinder (32) including a body (320) and a rod (321), a) said rod (or said body) being rigidly connected to at least one horizontal bearing surface (335) oriented downward and arranged such that, when said extracting device is positioned above said shim in order to extract same, the upper horizontal surface (240, 250) of each conductor (24, 25) is located directly opposite a horizontal bearing surface (335), b) said body (or said rod) being connected to said grasping means (31) of said shim, such that, when said cylinder (32) is actuated in order to extract said shim, said cylinder exerts opposing forces on said conductors and on said shim, which tend to space the latter apart from one another.