A synchronous measurement system for a melt interface of an aluminum electrolysis cell and a multi-parameter acquisition method

Abstract

This invention discloses a method and synchronous measurement system for acquiring multiple parameters of the melt interface in an aluminum electrolysis cell, belonging to the field of aluminum electrolysis production technology. The method includes assembling a measuring rod assembly with a built-in composite thermocouple and setting the initial height of the conductive contact section; driving the measuring rod assembly downwards into the melt, simultaneously acquiring thermoelectric potential signals, potential signals, and driving quantity signals; recording the corresponding first and second characteristic displacements based on the characteristic changes in the potential signal—a step increase upon contact with the electrolyte melt and a step decrease upon contact with the molten aluminum melt; and calculating the electrolyte height, molten aluminum height, electrolyte temperature, and bottom pressure drop based on the initial height and characteristic displacements. This invention also discloses a synchronous measurement system for implementing the above method, including a measuring rod assembly, a propulsion mechanism, and a data acquisition and processing unit. This invention can simultaneously acquire multiple key process parameters in a single downward probe operation, resulting in high measurement efficiency and good safety.

Description

Technical Field

[0001] This invention relates to the field of industrial measurement technology, specifically to a synchronous measurement system for the melt interface of an aluminum electrolysis cell and a method for acquiring multiple parameters. Background Technology

[0002] The aluminum electrolytic cell is the core equipment in aluminum electrolysis production. Under normal operating conditions, its interior is divided into two molten layers due to density differences: the upper layer is molten electrolyte, and the lower layer is molten aluminum. To reduce heat loss, a covering material layer covers the electrolyte. During aluminum electrolysis production, parameters such as electrolyte temperature, electrolyte level, molten aluminum level, and pressure drop at the bottom of the cell are key process indicators for judging cell condition and guiding production operations. Accurately obtaining these parameters is crucial for maintaining stable operation of the electrolytic cell, improving current efficiency, and reducing energy consumption.

[0003] Currently, obtaining these parameters mainly relies on manual measurement. Operators must first activate the shell-breaking mechanism to drill holes in the covering material layer, then insert a steel rod or simple probe into the melt, determine the interface position based on experience, roughly measure the height using a ruler or other tools, and simultaneously measure the temperature using an external temperature measuring instrument. This traditional method has many shortcomings: First, manual operation relies on experience, resulting in low measurement accuracy and poor repeatability; second, multiple parameters need to be measured step-by-step, which is time-consuming and cannot be obtained simultaneously; third, operators are in close contact with the high-temperature melt, posing significant safety hazards; finally, the pressure drop at the bottom of the tank usually needs to be measured or estimated separately, making it difficult to obtain it in the same measurement process as the interface parameters. Summary of the Invention

[0004] To address the aforementioned problems, specifically those raised in the background section, this invention proposes a method for obtaining multiple parameters of the melt interface in an aluminum electrolysis cell, characterized by the following steps: S1. Assemble the measuring rod assembly, and place a composite thermocouple inside a measuring rod. The front end of the measuring rod is a conductive contact section, so that the front measuring end of the composite thermocouple abuts against the inner wall of the conductive contact section at the front end of the measuring rod. The composite thermocouple is configured to generate a corresponding thermoelectric potential signal based on the temperature change of the conductive contact section, and to conduct potential signals from the conductive contact section. S2. Install the measuring rod assembly on the propulsion mechanism, and set the initial height of the conductive contact section relative to the inner surface of the bottom of the electrolytic cell as L0; S3. Control the propulsion mechanism 2 to drive the measuring rod assembly 1 to probe downward into the melt, and simultaneously collect the thermoelectric potential signal generated by the composite thermocouple and the potential signal transmitted therethrough, as well as the displacement of the conductive contact section from the initial height L0 calculated based on the driving amount of the propulsion mechanism. S4. Based on the characteristics of the potential signal changing with the displacement, automatically identify the position of the conductive contact segment contacting different melt interfaces and record the corresponding displacement. S5. Based on the initial height L0 and the displacement, calculate the geometric and physical parameters related to the melt state.

[0005] The present invention is further configured such that step S4 specifically includes: S41, when the potential signal rises in a step from a baseline value close to zero, it is determined that the conductive contact segment is in contact with the electrolyte melt, and the real-time displacement at this time is recorded as the first characteristic displacement ΔL1; S42, when the potential signal falls in a step after the step rise, it is determined that the conductive contact segment is in contact with the aluminum melt, and the real-time displacement at this time is recorded as the second characteristic displacement ΔL2.

[0006] A further provision of the present invention is that, in step S3, the driving amount of the propulsion mechanism is acquired in real time through the displacement measurement module and converted into the real-time displacement amount according to the pre-stored conversion coefficient.

[0007] A further provision of the present invention is that, in step S5, the geometric parameters and physical parameters include: Electrolyte height, which is the absolute value of the difference between the second characteristic displacement ΔL2 and the first characteristic displacement ΔL1; The height of the molten aluminum is the difference between the initial height L0 and the second characteristic displacement ΔL2; The electrolyte temperature is determined based on the thermoelectric potential signal collected throughout the displacement range of L0. The pressure drop at the bottom of the tank is the stable value maintained by the potential signal when the propulsion mechanism stops driving and the conductive contact section is located in the molten aluminum.

[0008] A further provision of the present invention is that the measuring rod includes at least the conductive contact section, the insulating isolation section, the corrosion-resistant section, and the lightweight section that are sequentially threaded together.

[0009] A further provision of the present invention is that the composite thermocouple includes a positive electrode and a negative electrode of a thermocouple core, which are used to form a thermoelectric circuit to generate the thermoelectric potential signal; and an independent conductive core wire, which is electrically connected to the inner wall of the armored sheath, for leading out the potential signal.

[0010] A synchronous measurement system for the melt interface of an aluminum electrolytic cell, the system comprising: A measuring rod assembly includes a measuring rod and a composite thermocouple disposed therein. The front end of the measuring rod is a conductive contact section. The composite thermocouple is configured to simultaneously provide thermoelectric potential signals and potential signals. The measuring end of the front end of the composite thermocouple abuts against the inner wall of the conductive contact section. A propulsion mechanism, mechanically connected to the measuring rod assembly, is used to drive it to move in the vertical direction; the propulsion mechanism includes a drive module and a displacement measurement module, the displacement measurement module being used to monitor the output of the drive module and generate a drive signal; The data acquisition and processing unit is connected to the displacement measurement module of the composite thermocouple and the propulsion mechanism respectively, and is used to synchronously receive the thermoelectric potential signal, the potential signal and the driving signal.

[0011] A further provision of the present invention is that the data acquisition and processing unit is configured to: calculate the displacement of the conductive contact segment based on the driving signal; automatically identify the position of the conductive contact segment contacting different melt interfaces based on the characteristics of the potential signal changing with the displacement, and obtain the corresponding first characteristic displacement ΔL1 and second characteristic displacement ΔL2; and calculate the geometric and physical parameters related to the melt state based on the initial height L0, the first characteristic displacement ΔL1, and the second characteristic displacement ΔL2.

[0012] A further feature of the present invention is that the displacement measurement module is a rotary encoder or a linear grating ruler; and the data acquisition and processing unit has pre-stored conversion coefficients for converting the driving signal into the displacement information.

[0013] The beneficial technical effects of this invention are as follows: 1. This invention accurately identifies the interface position based on the characteristic step change of the potential signal during medium switching. The signal rises stepwise when in contact with the electrolyte and falls stepwise when in contact with molten aluminum. This determination criterion is clear, the characteristics are significant, the anti-interference ability is strong, the interface positioning accuracy is high, and the technical solution is clear, complete, and easy to reproduce.

[0014] 2. Based on the identified first characteristic displacement ΔL1 and second characteristic displacement ΔL2, the present invention limits the temperature measurement range to between ΔL1 and ΔL2. The collected thermoelectric potential signal comes from the electrolyte melt, which significantly improves the accuracy of electrolyte temperature measurement.

[0015] 3. This invention innovatively designs a composite thermocouple structure. In addition to the traditional positive and negative electrodes of the thermocouple core, an independent conductive core wire is added. This conductive core wire is electrically connected to the inner wall of the armored sheath and is specifically used to extract the potential signal. This structural design achieves simultaneous acquisition of the thermoelectric potential signal and the potential signal from the same source without interference, ensuring complete temporal and spatial correspondence between the two signals. This lays the physical foundation for subsequent accurate identification based on signal characteristics, while also simplifying the internal wiring of the probe and improving system integration.

[0016] 4. In measuring the pressure drop at the bottom of the tank, this invention clearly distinguishes two different stages: the step drop of the potential signal indicates contact with the molten aluminum and is used to record the interface position; the stable value after the drop is the pressure drop at the bottom of the tank, used for parameter calculation. Simultaneously, by setting a safety limit protection, it ensures that the measuring rod remains stably in the molten aluminum before reading the pressure drop value, avoiding dynamic errors introduced by the movement state, resulting in more accurate and reliable measurement results.

[0017] In summary, this invention, through the unique design of a composite thermocouple, simultaneously acquires thermoelectric potential and electrical potential signals during a single descent. Combined with the displacement information of the propulsion mechanism, this allows for the simultaneous acquisition of four key process parameters: electrolyte temperature, electrolyte height, molten aluminum height, and pressure drop at the bottom of the tank. This eliminates the need for step-by-step measurements, significantly reducing the time required for a single measurement and improving operational efficiency. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of the present invention is shown.

[0019] Figure 2 A schematic diagram of the measuring rod assembly is shown.

[0020] Figure 3 A schematic diagram of a thermocouple is shown.

[0021] Figure 4 A schematic diagram of thermocouple measuring terminal A is shown.

[0022] Reference numerals: 1. Measuring rod assembly; 11. Measuring rod; 111. Conductive contact section; 112. Insulating isolation section; 113. Corrosion-resistant section; 114. Lightweight section; 12. Composite thermocouple; 121. Positive electrode of thermocouple core; 122. Negative electrode of thermocouple core; 123. Conductive core wire; 124. Armored sheath; 2. Propulsion mechanism; 3. Data acquisition and processing unit. Detailed Implementation

[0023] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0024] The aluminum electrolytic cell is the core equipment in aluminum electrolysis production. Under normal operating conditions, its interior is divided into two molten layers due to density differences: the upper layer is molten electrolyte, and the lower layer is molten aluminum. To reduce heat loss, the electrolyte is covered with a covering material (not shown in the attached diagram). Before the measurement operation of this application begins, the shell-breaking mechanism is first activated to break the covering material layer on top of the electrolyte, thus forming a vertical measurement channel that penetrates to the surface of the molten electrolyte.

[0025] Example 1: Method for obtaining multiple parameters of the melt interface in an aluminum electrolysis cell This application provides a method for obtaining multiple parameters of the melt interface in an aluminum electrolysis cell, specifically for the aforementioned application scenarios. This method simultaneously obtains multiple key process parameters, such as electrolyte temperature, electrolyte height, aluminum liquid height, and pressure drop at the bottom of the cell, through a single downward probe operation.

[0026] First, in step S1, assemble the measuring rod assembly. (As shown...) Figure 1 As shown, the core of the measuring rod assembly 1 is a segmented measuring rod 11 and a composite thermocouple 12 embedded within it. The front end of the measuring rod 11 is a conductive contact section 111 made of a high-temperature resistant conductive material (preferably graphite). During assembly, the composite thermocouple 12 is inserted into the measuring rod 11, ensuring that its measuring end A is in close contact with the inner wall of the conductive contact section 111 to guarantee good thermal and electrical contact. The composite thermocouple 12 is a specially designed thermocouple that can both generate a thermoelectric potential signal based on the temperature change sensed by the conductive contact section 111 and act as a conductor to extract the potential signal of the conductive contact section 111 itself.

[0027] Next, step S2 is performed to install the assembled measuring rod assembly 1 onto the propulsion mechanism 2. The propulsion mechanism 2 is a servo motor-driven lead screw mechanism, which can precisely control the lifting and lowering of the measuring rod 11. During installation, the initial height L0 of the lowest end of the conductive contact section 111 relative to the inner surface of the bottom of the electrolytic cell is set. This L0 can be obtained by initial calibration using laser ranging or other methods when the measuring rod assembly 1 is in its initial high position.

[0028] Then, the core data acquisition stage, step S3, begins. The propulsion mechanism 2 is activated, driving the measuring rod assembly 1 to descend into the electrolytic cell melt at a constant speed. During this descent, the data acquisition and processing unit 3 begins operation, simultaneously acquiring three signals: first, the thermoelectric potential signal (representing temperature) from the composite thermocouple 12; second, the potential signal (representing the voltage at the location of the conductive contact section 111) from the composite thermocouple 12; and third, the drive signal from the displacement measurement module (such as a rotary encoder) of the propulsion mechanism 2. Based on pre-stored conversion coefficients (e.g., the displacement corresponding to each encoder pulse), the data acquisition and processing unit 3 converts the real-time drive signal into the real-time displacement of the conductive contact section 111 as it descends from its initial height L0.

[0029] As the measuring rod 11 descends, the conductive contact section 111 sequentially contacts the air layer, the electrolyte melt layer, and the molten aluminum layer. Due to the different media it contacts, the conducted potential signal undergoes characteristic changes. Step S4 automatically identifies the interface position based on this characteristic.

[0030] Specifically, when the conductive contact section 111 is located in the air above the electrolyte liquid surface, the circuit is in an open circuit state and the potential signal is approximately zero (baseline value).

[0031] When the conductive contact segment 111 just comes into contact with the electrolyte melt, the circuit is instantly turned on because the electrolyte is conductive, and the potential signal will rise sharply. After detecting this feature, the data acquisition and processing unit 3 determines that it is in contact with the electrolyte melt and records the corresponding real-time displacement, which is called the first characteristic displacement ΔL1.

[0032] As the measuring rod 11 continues to descend, when the conductive contact section 111 moves from the electrolyte melt into the aluminum melt, since the aluminum melt is an electronic conductor, its ohmic potential is usually lower than the electrode potential of the electrolyte, which is an ionic conductor. Therefore, the potential signal in the measuring circuit will drop abruptly from the previous high-level plateau. The data acquisition and processing unit 3 identifies this potential drop, determines that it has now contacted the aluminum melt, and records the corresponding real-time displacement, which is called the second characteristic displacement ΔL2.

[0033] After identifying the key interface locations, step S5 is executed to perform calculations. Based on the known initial height L0 and the measured ΔL1 and ΔL2, the data acquisition and processing unit 3 automatically calculates the required parameters: Electrolyte height, which is the absolute value of the difference between the second characteristic displacement ΔL2 and the first characteristic displacement ΔL1; The height of the molten aluminum is the difference between the initial height L0 and the second characteristic displacement ΔL2; The electrolyte temperature is determined based on the thermoelectric potential signal collected throughout the displacement range of L0. The pressure drop at the bottom of the tank is the stable value maintained by the potential signal when the conductive contact section 111 is located within the molten aluminum after the propulsion mechanism 2 stops driving. It should be noted that the propulsion mechanism 2 is equipped with a safety limit protection during its descent. When it drives the measuring rod assembly 1 to descend to a preset maximum displacement (this value is less than the limit displacement at which the conductive contact section may touch the bottom of the tank), it automatically stops driving, ensuring that the conductive contact section 111 remains within the molten aluminum and does not mechanically contact the bottom of the electrolytic cell. At this time, the potential signal has entered a stable stage, and the collected stable value is the pressure drop at the bottom of the tank.

[0034] Through the above steps, the method of the present invention achieves rapid, synchronous, and automatic acquisition of multiple key melt parameters of an aluminum electrolysis cell without stopping the cell or contacting the bottom of the cell.

[0035] Example 2: Synchronous Measurement System for Melt Interface in Aluminum Electrolytic Cell This system mainly consists of three parts: measuring rod assembly 1, propulsion mechanism 2, and data acquisition and processing unit 3.

[0036] The measuring rod assembly 1 is the core component for realizing multi-functional sensing. For example... Figure 2 As shown, the measuring rod 11 preferably adopts a segmented design, including at least a conductive contact section 111, an insulating isolation section 112, a corrosion-resistant section 113, and a lightweight section 114 connected sequentially by threads. This design ensures both the conductivity and temperature measurement functions at the front end, while the insulating isolation section 112 ensures the accuracy of the potential signal measurement (preventing short circuits from the rear of the rod), and also balances the corrosion resistance of the rod and the overall weight. The internal composite thermocouple 12 is shown in [reference needed]. Figure 3 and Figure 4 It includes a positive electrode 121 and a negative electrode 122 of a thermocouple core for forming a temperature measuring circuit, as well as an independent conductive core wire 123. The conductive core wire 123 is electrically connected to the inner wall of the outermost armored sleeve 124, thereby enabling the precise extraction of the potential signal of the conductive contact section 111, realizing "one thermocouple for multiple uses".

[0037] The propulsion mechanism 2 is mechanically connected to the measuring rod assembly 1, providing it with precise vertical movement. The propulsion mechanism 2 integrates a drive module (such as a servo motor) and a displacement measurement module (such as a high-precision rotary encoder or linear encoder). The displacement measurement module monitors the output of the drive module in real time and generates a drive signal, providing raw data for subsequent displacement calculations.

[0038] The data acquisition and processing unit 3 is the brain of the entire system. It is connected to the composite thermocouple 12 and the displacement measurement module of the propulsion mechanism 2 via signal lines, and possesses multi-channel synchronous high-speed acquisition capabilities. It has a pre-installed computer program configured to perform the following functions: 1. Receive the drive signal and calculate and output the displacement of the conductive contact segment 111 in real time according to the pre-stored conversion coefficient.

[0039] 2. Monitor the potential signal in real time and use the edge detection algorithm to automatically identify its characteristic change points (step rise and fall) during the displacement process, thereby determining the first characteristic displacement ΔL1 and the second characteristic displacement ΔL2.

[0040] 3. Based on the preset initial height L0 and the identified ΔL1 and ΔL2, the built-in calculation model is invoked, and the electrolyte height, aluminum liquid height, electrolyte temperature and tank bottom pressure drop are automatically calculated according to the aforementioned formula.

[0041] Ultimately, all the collected raw data and the calculated final results can be displayed on the screen, and reports can be generated or uploaded to the factory's central control system.

[0042] This system, through its sophisticated probe design, precise displacement control, and intelligent data processing, achieves integrated, automated, and high-precision measurement of multiple parameters at the melt interface of aluminum electrolysis cells, which is of great value for optimizing the electrolytic aluminum production process and reducing energy consumption.

[0043] Although the invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0044] In the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0047] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A method for obtaining multiple parameters of the melt interface in an aluminum electrolysis cell, characterized in that, Includes the following steps: S1. Assemble the measuring rod assembly (1), and place a composite thermocouple (12) inside a measuring rod (11). The front end of the measuring rod (11) is a conductive contact section (111), so that the measuring end of the front end of the composite thermocouple (12) abuts against the inner wall of the conductive contact section (111) at the front end of the measuring rod (11). The composite thermocouple (12) is configured to generate a corresponding thermoelectric potential signal based on the temperature change of the conductive contact section (111), and to conduct the potential signal from the conductive contact section (111). S2. Install the measuring rod assembly (1) on the propulsion mechanism (2) and set the initial height of the conductive contact section (111) relative to the inner surface of the bottom of the electrolytic cell as L0. S3. Control the propulsion mechanism (2) to drive the measuring rod assembly (1) to probe downward into the melt, and simultaneously collect the thermoelectric potential signal generated by the composite thermocouple (12) and the potential signal transmitted therethrough, as well as the displacement of the conductive contact section (111) from the initial height L0 calculated based on the driving amount of the propulsion mechanism (2). S4. Based on the characteristics of the potential signal changing with the displacement, automatically identify the position of the conductive contact segment (111) contacting different melt interfaces and record the corresponding displacement. S5. Based on the initial height L0 and the displacement, calculate the geometric and physical parameters related to the melt state.

2. The method for obtaining multiple parameters of the melt interface in an aluminum electrolysis cell according to claim 1, characterized in that, The specific steps of step S4 include: S41, when the potential signal rises in a step from a baseline value close to zero, it is determined that the conductive contact segment (111) is in contact with the electrolyte melt, and the real-time displacement at this time is recorded as the first characteristic displacement ΔL1; S42, when the potential signal drops in a step after the step rise, it is determined that the conductive contact segment (111) is in contact with the aluminum melt, and the real-time displacement at this time is recorded as the second characteristic displacement ΔL2.

3. The method for obtaining multiple parameters of the melt interface in an aluminum electrolysis cell according to claim 1, characterized in that, In step S3, the driving amount of the propulsion mechanism (2) is obtained in real time through the displacement measurement module and converted into the real-time displacement amount according to the pre-stored conversion coefficient.

4. The method for obtaining multiple parameters of the melt interface in an aluminum electrolysis cell according to claim 1, characterized in that, In step S5, the geometric parameters and physical parameters include: Electrolyte height, which is the absolute value of the difference between the second characteristic displacement ΔL2 and the first characteristic displacement ΔL1; The height of the molten aluminum is the difference between the initial height L0 and the second characteristic displacement ΔL2; The electrolyte temperature is determined based on the thermoelectric potential signal collected throughout the displacement range of L0. The pressure drop at the bottom of the tank is the stable value maintained by the potential signal when the propulsion mechanism (2) stops driving and the conductive contact section (111) is located in the molten aluminum.

5. The method for obtaining multiple parameters of the melt interface in an aluminum electrolysis cell according to claim 1, characterized in that, The measuring rod (11) includes at least the conductive contact section (111), the insulating isolation section (112), the corrosion-resistant section (113), and the lightweight section (114) that are connected in sequence by threads.

6. The method for obtaining multiple parameters of the melt interface in an aluminum electrolysis cell according to claim 1, characterized in that, The composite thermocouple (12) includes a positive electrode (121) and a negative electrode (122) of a thermocouple core, which are used to form a thermoelectric circuit to generate the thermoelectric potential signal; and an independent conductive core wire (123), which is electrically connected to the inner wall of the armored sleeve (124) to extract the potential signal.

7. A synchronous measurement system for the melt interface of an aluminum electrolytic cell, characterized in that, The system for implementing the method as described in any one of claims 1-6 comprises: The measuring rod assembly (1) includes a measuring rod (11) and a composite thermocouple (12) disposed therein. The front end of the measuring rod (11) is a conductive contact section (111). The composite thermocouple (12) is configured to simultaneously provide thermoelectric potential signal and potential signal. The measuring end of the front end of the composite thermocouple (12) abuts against the inner wall of the conductive contact section (111). The propulsion mechanism (2) is mechanically connected to the measuring rod assembly (1) and is used to drive it to move in the vertical direction; the propulsion mechanism (2) includes a drive module and a displacement measurement module, the displacement measurement module is used to monitor the output of the drive module and generate a drive signal; The data acquisition and processing unit (3) is connected to the displacement measurement module of the composite thermocouple and the propulsion mechanism respectively, and is used to synchronously receive the thermoelectric potential signal, the potential signal and the driving signal.

8. The synchronous measurement system for the melt interface of an aluminum electrolytic cell according to claim 7, characterized in that, The data acquisition and processing unit is configured to: calculate the displacement of the conductive contact segment (111) based on the driving signal; and automatically identify the position of the conductive contact segment contacting different melt interfaces based on the characteristics of the potential signal changing with the displacement, thereby obtaining the corresponding first characteristic displacement ΔL1 and second characteristic displacement ΔL2. Based on the initial height L0, the first characteristic displacement ΔL1, and the second characteristic displacement ΔL2, the geometric and physical parameters related to the melt state are calculated.

9. The synchronous measurement system for the melt interface of an aluminum electrolytic cell according to claim 7, characterized in that, The displacement measurement module is a rotary encoder, linear encoder, or other device used to achieve precise displacement or distance measurement; the data acquisition and processing unit has pre-stored conversion coefficients for converting the driving signal into the displacement information.

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