Liquid level detection device applied to pressure casting smelting furnace

Abstract

The invention provides a liquid level detection device applied to a pressure casting smelting furnace, the device is arranged on a smelting furnace body, a solution is arranged in the smelting furnace body, and a feeding port is formed in the smelting furnace body; the device comprises an acquisition module used for acquiring buoyancy data of a solution in the smelting furnace body; and the analysis module is connected with the acquisition module and is used for obtaining liquid level data of the solution by utilizing a buoyancy liquid level conversion algorithm based on the buoyancy data. The buoyancy data of the solution in the smelting furnace body is collected through the collecting module, then the liquid level data is obtained through the buoyancy liquid level conversion algorithm, and compared with traditional manual observation and a simple liquid level meter, the accuracy and stability of liquid level detection can be remarkably improved. Especially in a high-pressure casting environment, real-time capturing and accurate control of tiny fluctuation of the liquid level can be achieved, casting defects and safety accidents caused by fluctuation of the liquid level are effectively avoided, and therefore the product quality and the production safety are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of furnace liquid level detection, and particularly to a liquid level detection device applied to a die-casting furnace. Background Art

[0002] In the die-casting process, the liquid level control of the molten metal in the furnace is the core link determining product quality and production safety. The liquid level stability directly affects the internal quality of the casting: if the liquid level is too low, it may lead to insufficient melt feeding, causing defects such as shrinkage porosity and gas holes; if the liquid level is too high, it may cause safety accidents such as melt overflow and splashing. Especially in the high-pressure casting environment, even a small liquid level fluctuation may be amplified into process instability. Therefore, realizing real-time, accurate detection and closed-loop control of the furnace liquid level is the basis for ensuring the reliability of the die-casting process.

[0003] Currently, the industrial site generally adopts the monitoring method of combining manual visual observation with a simple liquid level gauge. Manual observation depends on the operator's experience, and it is difficult to identify small liquid level changes (such as millimeter-level fluctuations). Moreover, interferences such as strong light and smoke generated by the high-temperature furnace will further reduce the accuracy of visual judgment. Summary of the Invention

[0004] The present invention aims to at least solve the technical problem of low accuracy in liquid level judgment existing in the prior art, and particularly innovatively proposes a liquid level detection device applied to a die-casting furnace.

[0005] To achieve the above object of the present invention, the present invention provides a liquid level detection device applied to a die-casting furnace. The device is arranged on the furnace body. There is a solution in the furnace body, and a feeding port is provided thereon. The device includes: An acquisition module for acquiring buoyancy data of the solution in the furnace body; An analysis module, connected to the acquisition module, and obtaining liquid level data of the solution by using a buoyancy liquid level conversion algorithm based on the buoyancy data.

[0006] As an optional embodiment of the present invention, optionally, the acquisition module includes: A flange arranged on the furnace body; A cylinder sleeve arranged on the flange; A buoyancy tube arranged in the cylinder sleeve and floating on the solution; A plug block arranged at the top of the buoyancy tube; A pressure sensor arranged at the top of the plug block and close to the inner top of the cylinder sleeve.

[0007] As an optional embodiment of the present invention, optionally, at least one O-ring is arranged between the buoyancy tube and the cylinder sleeve.

[0008] As an alternative embodiment of the present invention, optionally, the buoyancy liquid level conversion algorithm is the liquid level data obtained by operating on the solution density data, the pressure data inside the furnace body, and the buoyancy tube size data.

[0009] As an alternative embodiment of the present invention, optionally, the expression of the buoyancy liquid level conversion algorithm is: Wherein, represents the height of the solution liquid level, represents the force measured by the pressure sensor, represents the total weight of the buoyancy tube and the plug, represents the pressure inside the furnace body, represents the cross-sectional area of the buoyancy tube, represents the solution density, represents the acceleration due to gravity.

[0010] As an alternative embodiment of the present invention, optionally, the buoyancy tube is limited above the solution through a guide tube.

[0011] As an alternative embodiment of the present invention, optionally, the device further includes: An alarm module, connected to the analysis module, and emits an alarm signal when the liquid level data of the solution reaches a preset threshold; A display module, connected to the analysis module, for real-time displaying the liquid level data of the solution; A control module, connected to the acquisition module, the analysis module, the alarm module, and the display module, for controlling the operating states of each module.

[0012] As an alternative embodiment of the present invention, optionally, the control module controls the feeding speed of the feeding port based on the current liquid level data using a liquid level control algorithm; When the current liquid level data is lower than a preset minimum liquid level threshold, the control module automatically increases the feeding speed of the feeding port; When the current liquid level data is higher than a preset maximum liquid level threshold, the control module automatically reduces the feeding speed of the feeding port or stops feeding.

[0013] As an alternative embodiment of the present invention, optionally, the expression of the liquid level control algorithm is: Wherein, represents the real-time feeding speed of the feeding port, represents time, represents the proportional gain, represents the liquid level error, represents the integral gain, represents at the liquid level error at the moment, represents the derivative gain, represents the rate of change of the liquid level error with time of, represents the feed - forward compensation term, represents the set liquid level, represents the real - time liquid level, represents the cross - sectional area of the furnace body, represents the reference solution density, represents the real - time solution density, represents the rate of change of the liquid level set value.

[0014] As an alternative embodiment of the present invention, optionally, the device further includes an adaptive environmental interference suppression module, connected to the analysis module, which dynamically corrects the output result of the buoyancy liquid level conversion algorithm based on the real - time temperature data of the solution in the furnace body, the gas pressure fluctuation data, and the furnace vibration spectrum data through a multi - parameter coupling model; The expression of the dynamic correction is: where, represents the corrected liquid level data, represents the original liquid level data output by the buoyancy liquid level conversion algorithm, , and represent the parameters of the multi - parameter coupling model, represents the deviation between the real - time temperature of the solution and the reference temperature, represents the amplitude of the pressure fluctuation in the furnace, represents the rated working pressure of the furnace, represents the frequency band, represents the furnace vibration acceleration signal in the amplitude of the

[0015] Advantages of the present invention: The present invention collects the buoyancy data of the solution in the furnace body through the acquisition module, and then obtains the liquid level data by using the buoyancy liquid level conversion algorithm. Compared with the traditional manual observation and simple liquid level gauge, the present invention can significantly improve the accuracy and stability of liquid level detection. Especially in the high - pressure casting environment, the present invention can achieve real - time capture and precise control of minute liquid level fluctuations, effectively avoiding casting defects and safety accidents caused by liquid level fluctuations, thereby improving the quality of products and the safety of production.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 FIG. 1 is a schematic installation structure diagram of a liquid level detection device applied to a die casting furnace according to the present invention; Figure 2 FIG. 2 is a schematic structure diagram of a liquid level detection device applied to a die casting furnace according to the present invention; Figure 3 FIG. 3 is a schematic module structure diagram of a liquid level detection device applied to a die casting furnace according to the present invention.

[0018] In the figures: 1, furnace body; 2, charging port; 3, acquisition module, 301, buoyancy tube, 302, plug, 303, pressure sensor, 304, cylinder sleeve, 305, flange, 306, wire harness, 307, O-ring; 4, guide tube. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0020] As shown in FIGS. 1, 2 and 3, a liquid level detection device applied to a die casting furnace is provided on the furnace body 1. There is a solution in the furnace body 1 and a charging port 2 is provided thereon. The device includes: Figure 1 、 2 and FIG. 3, a liquid level detection device applied to a die casting furnace, the device is arranged on the furnace body 1, a solution is arranged in the furnace body 1, and a charging port 2 is arranged thereon; the device includes: An acquisition module 3 for acquiring buoyancy data of the solution in the furnace body 1; As shown in FIGS. 1, 2 Figure 1 and 2As shown in the figure, the acquisition module 3 includes a flange 305, a cylinder liner 304, a buoyancy tube 301, a plug 302, and a pressure sensor 303. Inside the cylinder liner 304, a pressure sensor 303, a plug 302, and a buoyancy tube 301 are arranged in sequence from top to bottom. During use, the buoyancy tube 301 is vertically placed on the solution, and through the cooperation of the plug 302 and the buoyancy tube 301, the stable floating of the buoyancy tube 301 in the solution is ensured. The pressure sensor 303 is arranged close to the inner top of the cylinder liner 304 and is used to measure in real time the pressure generated by the buoyancy tube 301 and the solution above it on the plug 302. The cylinder liner 304 is fixedly connected to the flange 305 to ensure the stability of the overall structure of the acquisition module 3. One end of the wire harness 306 passes through the flange 305 and is connected to the pressure sensor 303, and the other end is connected to the analysis module, which is used to transmit the pressure data (buoyancy data) to the analysis module.

[0021] The analysis module, connected to the acquisition module 3, obtains the liquid level data of the solution based on the buoyancy data using the buoyancy liquid level conversion algorithm.

[0022] It should be noted that the analysis module first converts the pressure data of the analog signal into the pressure data of the digital signal, and then preprocesses the pressure data of the mathematical signal to improve the accuracy and stability of the data. The preprocessing steps include but are not limited to denoising and calibration to ensure the reliability of subsequent liquid level calculations. The analysis module calculates the liquid level data through the buoyancy liquid level conversion algorithm. The specific buoyancy liquid level conversion algorithm takes into account multiple factors such as solution density, pressure in the furnace, and buoyancy tube size to ensure the accuracy of the liquid level data.

[0023] In practical applications, when the liquid level of the solution in the furnace changes, the buoyancy tube 301 will generate a corresponding pressure change on the plug 302. This pressure change is captured by the pressure sensor 303 in real time and converted into an electrical signal and transmitted to the analysis module. After receiving the signal, the analysis module first performs signal conditioning, including steps such as amplification, filtering, and analog-to-digital conversion, to improve the signal-to-noise ratio and anti-interference ability of the signal. Subsequently, the analysis module uses the preset buoyancy liquid level conversion algorithm to calculate the processed signal, thereby obtaining the real-time liquid level data of the solution in the furnace.

[0024] After obtaining the liquid level data, the analysis module transmits the result to the display module for real-time display, which is convenient for the operator to intuitively understand the liquid level state of the solution in the furnace. At the same time, the alarm module will monitor the liquid level data according to the preset liquid level threshold. Once the liquid level exceeds the safe range, an alarm signal will be immediately issued to ensure production safety.

[0025] As an optional embodiment of the present invention, optionally, the acquisition module 3 includes: A flange 305, arranged on the furnace body 1; Such as Figure 2As shown, the flange 305 is fixed to the furnace body 1 by screws, which is used to fix the cylinder sleeve 304 and provide a stable installation foundation for the collection module 3.

[0026] The cylinder sleeve 304 is arranged on the flange 305; like Figure 2 As shown, in this embodiment, the cylinder sleeve 304 and the flange 305 are integrally formed to ensure the strength and sealing of the structure. The cylinder sleeve 304 and the flange 305 are both made of metal aluminum.

[0027] The buoyancy tube 301 is disposed in the cylinder sleeve 304 and floats on the solution; like Figure 1 and 2 As shown, the buoyancy tube 301 of this embodiment is a quartz tube, which has good high temperature resistance and chemical stability, ensuring long-term stable operation in a high-pressure casting environment. The bottom of the buoyancy tube 301 is closed to prevent the solution from penetrating into the tube and affecting its buoyancy characteristics. The side wall of the buoyancy tube 301 is smooth to reduce the friction resistance with the solution, so that it can respond more sensitively to changes in the liquid level.

[0028] A plug 302 is disposed on the top of the buoyancy tube 301; like Figure 2 As shown, in this embodiment, the plug 302 is a metal plug, which is used to fix the top of the buoyancy tube 301 and form a good seal with the buoyancy tube 301 to prevent the solution or gas from entering the buoyancy tube 301 and affecting the accuracy of the buoyancy measurement. The top of the plug 302 is designed to be flat, so as to facilitate the installation of the pressure sensor 303 and ensure that the pressure sensor 303 can stably and accurately measure the pressure generated by the buoyancy tube 301 and the solution above it on the plug 302. The material selection of the plug 302 matches the cylinder sleeve 304 to ensure the overall corrosion resistance and high temperature resistance.

[0029] The pressure sensor 303 is disposed on the top of the plug block 302 and is close to the inner top of the cylinder sleeve 304 .

[0030] like Figure 2 As shown, the pressure sensor 303 is installed on the top of the plug 302, and is used to measure the pressure of the buoyancy tube 301 and the solution above it on the plug 302 in real time. The pressure sensor 303 adopts a high-precision piezoresistive sensor, which has the advantages of high sensitivity, wide measurement range, and good stability, ensuring that the slight pressure changes of the buoyancy tube 301 can be accurately captured and converted into electrical signals for transmission. In addition, the pressure sensor 303 also has an overload protection function, which can protect the sensor from damage under abnormal conditions and improve the overall reliability and safety of the system.

[0031] During use, first, the entire acquisition module 3 is installed on the furnace body 1 using the flange 305 to ensure that the buoyancy tube 301 is vertically placed above the solution. As the liquid level in the furnace rises and falls, the buoyancy tube 301 floats up and down in the solution, thereby driving the plug 302 to move synchronously. This movement causes the pressure of the plug 302 on the pressure sensor 303 to change. The pressure sensor 303 captures this pressure change in real time and converts it into an electrical signal, which is then transmitted to the analysis module through the wire harness 306 for subsequent processing and analysis.

[0032] As an alternative embodiment of the present invention, optionally, at least one O-ring 307 is provided between the buoyancy tube 301 and the cylinder sleeve 304.

[0033] As Figure 2 shown, in this embodiment, three O-rings 307 are provided and are all movably installed between the buoyancy tube 301 and the cylinder sleeve 304 to improve the sealing performance between the buoyancy tube 301 and the cylinder sleeve 304 and prevent the solution from seeping in, resulting in measurement errors. The O-ring 307 is made of a material that is resistant to high temperatures and corrosion to ensure long-term stable operation in a high-pressure casting environment. By providing the O-ring 307, the measurement accuracy and stability of the acquisition module 3 are further improved. The O-ring 307 has a circular structure, and its cross-section is also circular. It can rotate between the buoyancy tube 301 and the cylinder sleeve 304. It is made of rubber, has good elasticity, and does not reduce the buoyancy response speed of the buoyancy tube 301. The setting of the O-ring 307 also plays a buffering role, reducing the friction between the buoyancy tube 301 and the cylinder sleeve 304 and extending the service life of the acquisition module 3.

[0034] As an alternative embodiment of the present invention, optionally, the buoyancy liquid level conversion algorithm is the liquid level data obtained based on the solution density data, the pressure data inside the furnace body 1, and the dimension data of the buoyancy tube 301.

[0035] It should be noted that the buoyancy liquid level conversion algorithm realizes the accurate detection of the liquid level in the pressure casting furnace by integrating buoyancy, pressure, and geometric parameters. In actual operation, the density of the solution may fluctuate due to factors such as temperature and composition changes, and the pressure inside the furnace may also be adjusted according to the needs of the casting process. The size of the buoyancy tube directly affects its response sensitivity to liquid level changes. The buoyancy liquid level conversion algorithm precisely calculates the accurate data that can truly reflect the liquid level of the solution in the furnace based on a comprehensive consideration of these factors.

[0036] As an alternative embodiment of the present invention, optionally, the expression of the buoyancy liquid level conversion algorithm is: where represents the height of the solution liquid level; represents the force measured by the pressure sensor 303, specifically the acting force of the buoyancy tube 301 and the plug 302 on the sensor; represents the total weight of the buoyancy tube 301 and the plug 302; represents the pressure inside the furnace body 1, and the pressure is measured by a pressure sensor; represents the cross-sectional area of the buoyancy tube 301, specifically the area of the vertical section of the buoyancy tube 301; represents the solution density; represents the acceleration due to gravity.

[0037] As an alternative embodiment of the present invention, optionally, the buoyancy tube 301 is limited above the solution through the guide tube 4.

[0038] As Figure 1 shown, the guide tube 4 is installed at the top inside the furnace body 1 and is in sliding fit with the buoyancy tube 301, used to limit the movement of the buoyancy tube 301 in the vertical direction, and at the same time allow a certain swing in the horizontal direction to adapt to the fluctuations of the solution in the furnace. The inner wall of the guide tube 4 is smooth to reduce the frictional resistance with the buoyancy tube 301 and ensure its smooth floating. The material of the guide tube 4 is selected to match that of the cylinder liner 304 to ensure the overall corrosion resistance and high-temperature resistance. When installed, the buoyancy tube 301 passes through the guide tube 4 and contacts the solution inside the furnace body 1; the guide tube 4 of this embodiment is of a cylindrical structure, and its diameter is larger than that of the buoyancy tube 301. By setting the guide tube 4, the stability of the buoyancy tube 301 in the solution is further improved, enabling it to more accurately reflect the liquid level change of the solution in the furnace. The top of the guide tube 4 is fixedly connected to the inner wall of the furnace body 1, and enough space is left at the bottom for the buoyancy tube 301 to float up and down. In practical applications, the buoyancy tube 301 floats up and down under the guidance of the guide tube 4 as the liquid level of the solution in the furnace rises and falls, thereby realizing the real-time detection of the liquid level of the solution in the furnace.

[0039] As an alternative embodiment of the present invention, optionally, the device further includes: an alarm module, connected to the analysis module, and when the liquid level data of the solution reaches a preset threshold, an alarm signal is issued; As Figure 3As shown, it should be noted that in this embodiment, the alarm module is an audible and visual alarm. When the liquid level data transmitted by the analysis module exceeds the preset safety range, the alarm module is immediately activated, emitting a loud alarm sound and obvious light flashes to attract the attention of the operator, ensuring that the liquid level anomaly can be detected and processed in a timely manner and potential safety accidents can be avoided. The preset threshold of the alarm module can be adjusted according to actual production requirements to improve the flexibility and applicability of the system.

[0040] A display module, connected to the analysis module, for real-time displaying the liquid level data of the solution; It should be noted that in this embodiment, the display module is a touch screen display, which can intuitively display the liquid level state of the solution in the furnace, facilitating the operator to monitor and record in real time. The display module uses a high-resolution liquid crystal display screen to ensure that the displayed liquid level data is clear and accurate. At the same time, the touch screen design enables the operator to control the system and query data through simple touch operations, improving the operation convenience and user experience of the system.

[0041] A control module, connected to the acquisition module, analysis module, alarm module and display module, for controlling the operating states of each module.

[0042] It should be noted that in this embodiment, the control module is a programmable logic controller (PLC). As the core of the entire system, it is responsible for receiving the pressure data from the acquisition module and transmitting it to the analysis module for processing. The PLC is also responsible for receiving the liquid level data transmitted by the analysis module and controlling the working states of the alarm module and display module according to the preset logic program. When the liquid level data exceeds the preset safety range, the PLC will immediately trigger the alarm module and update the display content of the display module to remind the operator to take corresponding measures. The PLC uses a high-performance processor and a stable operating system to ensure the real-time performance and reliability of the system. In addition, the PLC also has a network communication function and can perform data transmission and interaction with other production management systems to realize the automation and intelligence of the production process.

[0043] As an alternative embodiment of the present invention, optionally, the control module controls the feeding speed of the feeding port 2 using a liquid level control algorithm based on the current liquid level data; When the current liquid level data is lower than the preset minimum liquid level threshold, the control module automatically increases the feeding speed of the feeding port 2; When the current liquid level data is higher than the preset maximum liquid level threshold, the control module automatically reduces the feeding speed of the feeding port 2 or stops feeding.

[0044] It should be noted that the implementation of this liquid level control algorithm depends on the real-time analysis and processing of liquid level data by the control module. The control module first receives the liquid level data from the analysis module, and then automatically adjusts the feeding speed at the feeding port 2 according to the preset liquid level threshold and control logic. When the liquid level data is lower than the minimum liquid level threshold, the control module will send a signal to the feeding system (feeding servo motor) to increase the feeding speed to ensure that the liquid level of the solution in the furnace can quickly return to the safe range. On the contrary, when the liquid level data is higher than the maximum liquid level threshold, the control module will reduce the feeding speed or stop feeding to prevent the solution from overflowing and causing safety hazards. This automatic control process greatly improves the production efficiency and reduces the errors and risks caused by manual operation.

[0045] As an alternative embodiment of the present invention, optionally, the expression of the liquid level control algorithm is: Wherein, represents the real-time feeding speed of the feeding port 2; represents time; represents the proportional gain, the coefficient for amplifying the current error, to quickly respond to the liquid level deviation; represents the liquid level error; represents the integral gain, the coefficient for eliminating the steady-state error, to accumulate the historical error; represents at the liquid level error at the moment; represents the derivative gain, the coefficient for suppressing overshoot, to predict the change trend of the error; represents the change rate of the liquid level error with time ; represents the feedforward compensation term, for the pre-compensated flow based on the solution density and the cross-sectional area of the furnace body , the compensation term can offset the influence of density fluctuations or liquid level dynamic adjustments on the feeding flow; represents the set liquid level; represents the real-time liquid level; represents the cross-sectional area of the furnace body 1; represents the reference solution density; Indicates the real-time solution density; Indicates the change rate of the liquid level set value.

[0046] As an alternative embodiment of the present invention, optionally, the device further includes an adaptive environmental interference suppression module, connected to the analysis module, which dynamically corrects the output result of the buoyancy liquid level conversion algorithm based on the real-time temperature data of the solution in the furnace body 1, the gas pressure fluctuation data, and the furnace vibration spectrum data through a multi-parameter coupling model; The expression of the dynamic correction is: Wherein, Indicates the corrected liquid level data; Indicates the original liquid level data output by the buoyancy liquid level conversion algorithm; , and Indicates the parameters of the multi-parameter coupling model, obtained by offline training of historical data; Indicates the deviation between the real-time temperature of the solution and the reference temperature; Indicates the amplitude of the pressure fluctuation in the furnace; Indicates the rated working pressure of the furnace; Indicates the frequency band; Indicates the furnace vibration acceleration signal in the spectral analysis of the amplitude of the

[0047] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A liquid level detection device applied to a pressure casting furnace, the device is arranged on a furnace body (1), a solution is arranged in the furnace body (1), and a feeding port (2) is arranged on the furnace body; characterized in that, The device includes: A collection module (3) for collecting the buoyancy data of the solution in the furnace body (1); An analysis module, connected to the collection module (3), which obtains the liquid level data of the solution based on the buoyancy data using a buoyancy liquid level conversion algorithm; The device further includes an adaptive environmental interference suppression module, connected to the analysis module, which dynamically corrects the output result of the buoyancy liquid level conversion algorithm through a multi-parameter coupling model based on the real-time temperature data of the solution in the furnace body (1), the gas pressure fluctuation data, and the furnace vibration spectrum data; The expression of the dynamic correction is: Among them, represents the corrected liquid level data, represents the original liquid level data output by the buoyancy liquid level conversion algorithm, , and represent the parameters of the multi-parameter coupling model, represents the deviation between the real-time temperature of the solution and the reference temperature, represents the amplitude of the pressure fluctuation in the furnace, represents the rated working pressure of the furnace, represents the frequency band, represents the vibration acceleration signal of the furnace in the spectral analysis of the amplitude of the th frequency band; A control module, which controls the feeding speed of the feeding port (2) based on the current liquid level data using a liquid level control algorithm.

2. The liquid level detection device applied to a die casting furnace as described in claim 1, characterized in that, The collection module (3) includes: A flange (305) provided on the furnace body (1); A cylinder liner (304) provided on the flange (305); A buoyancy tube (301) provided in the cylinder liner (304) and floating on the solution; A plug (302) provided at the top of the buoyancy tube (301); A pressure sensor (303) provided at the top of the plug (302) and close to the inner top of the cylinder liner (304).

3. The liquid level detection device applied to a die casting furnace according to claim 2, characterized in that, At least one O-ring (307) is provided between the buoyancy tube (301) and the cylinder liner (304).

4. The liquid level detection device applied to a die casting furnace according to claim 2, characterized in that, The buoyancy liquid level conversion algorithm is the liquid level data obtained by operating based on the solution density data, the pressure data in the furnace body (1), and the dimension data of the buoyancy tube (301).

5. The liquid level detection device applied to a die casting furnace according to claim 4, characterized in that, The expression of the buoyancy liquid level conversion algorithm is: Among them, represents the height of the solution liquid level, represents the force measured by the pressure sensor (303), represents the total weight of the buoyancy tube (301) and the plug (302), represents the pressure inside the furnace body (1), represents the cross-sectional area of the buoyancy tube (301), represents the solution density, represents the acceleration due to gravity.

6. The liquid level detection device applied to a die casting furnace according to claim 2, characterized in that, The buoyancy tube (301) is limited to float on the solution through a guide tube (4).

7. The liquid level detection device applied to a die casting furnace as claimed in claim 1, characterized in that, The device further includes: An alarm module, connected to the analysis module, which emits an alarm signal when the liquid level data of the solution reaches a preset threshold; A display module, connected to the analysis module, for real-time displaying the liquid level data of the solution; A control module, connected to the collection module, the analysis module, the alarm module, and the display module, for controlling the operating states of each module.

8. The liquid level detection device applied to a die casting furnace according to claim 7, characterized in that, The control module controls the feeding speed of the feeding port (2) based on the current liquid level data using a liquid level control algorithm; When the current liquid level data is lower than a preset minimum liquid level threshold, the control module automatically increases the feeding speed of the feeding port (2); When the current liquid level data is higher than a preset maximum liquid level threshold, the control module automatically decreases the feeding speed of the feeding port (2) or stops feeding.

9. The liquid level detection device applied to a die casting furnace as claimed in claim 8, wherein, The expression of the liquid level control algorithm is: Among them, represents the real-time feeding speed of the feeding port (2), represents time, represents the proportional gain, represents the liquid level error, represents the integral gain, represents at the liquid level error at the moment, represents the derivative gain, represents the change rate of the liquid level error with time of, represents the feedforward compensation term, represents the set liquid level, represents the real-time liquid level, represents the cross-sectional area of the furnace body (1), represents the reference solution density, represents the real-time solution density, represents the change rate of the liquid level set value.

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