A digital junction box-based fusing type weighing sensor system

Abstract

The application discloses a kind of based on digital terminal box's fusing type weighing sensor system, including digital terminal box, weighing sensor group and digital weighing instrument, the weighing sensor group is four analog high-temperature weighing sensors, for collecting molten steel weight analog signal under high-temperature environment, the digital terminal box is equipped with independent supply bridge circuit corresponding to each weighing sensor, and each supply bridge circuit is connected with fusing fuse in series.The fusing type weighing sensor system based on digital terminal box, through the quick fusing fuse of adaptation, so that fault response time ≤50ms, can immediately cut off fault sensor circuit, completely solve the defect of mutual damage, ensure that other sensors work normally, and without stopping pouring, through digital weighing instrument, complete the whole process of fault positioning, shielding, signal replacement, data output, solve the contradiction that manual cannot be online troubleshooting fault under high-temperature scene, reduce the influence of fault on production to minimum.

Description

Technical Field

[0001] This invention relates to the field of industrial weighing sensing technology, specifically to a fuse-type weighing sensing system based on a digital junction box. Background Technology

[0002] The ladle scale and tundish scale on the continuous casting platform in the steelmaking workshop of a steel plant are the core weighing instruments that guide the continuous casting process. They have extremely high requirements for the stability and reliability of measurement (allowable error ≤ ±1%). In the existing technology, the weighing system of each ladle scale or tundish scale is usually composed of four analog weighing sensors connected in parallel through a junction box, and then connected to an analog weighing instrument through a cable.

[0003] However, this structure has significant drawbacks: First, the sensors are connected in parallel. If the signal cable of a single sensor is burned out by molten steel and short-circuited, or if the sensor itself is damaged, the entire weighing system will lose its weight data output function, resulting in a domino effect. Second, the parallel connection method cannot quickly locate the fault point, and the temperature at the sensor installation location is as high as 80°C or more. Continuous casting production is a 24-hour continuous operation, and the circuit can only be checked and repaired when casting is stopped. This means that the impact of the fault on production can last for several hours or even longer, seriously interfering with the stability of the continuous casting process. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a fuse-type weighing sensing system based on a digital junction box, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a fuse-type weighing sensing system based on a digital junction box, comprising a digital junction box, a weighing sensor group, and a digital weighing instrument; The weighing sensor group consists of four analog high-temperature weighing sensors, used to collect analog signals of molten steel weight in a high-temperature environment. The digital junction box is equipped with an independent power supply circuit corresponding to each weighing sensor. Each power supply circuit is connected in series with a fuse with a capacity of 1.2-1.5 times the rated operating current of the corresponding weighing sensor. The digital junction box also has a built-in digital chip with a 16-bit or higher A / D conversion accuracy, which is used to convert analog weight signals into digital signals.

[0006] The weighing sensors correspond one-to-one with the bridge circuit of the digital junction box and are electrically connected. The digital junction box establishes bidirectional communication with the digital weighing instrument through an RS485 communication interface.

[0007] The digital weighing instrument is used to receive digital signals from each weighing sensor in real time, record signal data, locate faulty sensors, shield faulty sensor signals, and call up the signals of normal weighing sensors at symmetrical positions to reconfigure and output weight data that meets production requirements.

[0008] Furthermore, the fuse is a fast-blow type. When the signal cable of the corresponding load cell is short-circuited or the sensor itself is damaged, the fuse response time is ≤50ms, cutting off the excitation voltage output of the bridge circuit and preventing the fault from spreading to other bridge circuits.

[0009] Furthermore, the digital chip is an STM32 series microcontroller that integrates a signal amplification module and an anti-interference filtering unit. It can amplify the weak analog signal output by the weighing sensor and then perform digital conversion with a conversion error of ≤±0.01%.

[0010] Furthermore, the digital weighing instrument has a touch screen structure, and the operation interface displays the signal values, fault status and total system weight data of each weighing sensor in real time. The fault status includes the fault number and the time of fault occurrence, and supports manual or automatic disabling of faulty sensors.

[0011] Furthermore, the digital weighing instrument has a built-in fault diagnosis module that monitors whether the sensor signal is interrupted and whether the signal amplitude exceeds a preset threshold, which is ±10% of the rated signal value, to accurately identify the faulty sensor number and fault type, i.e., short circuit or damage.

[0012] Furthermore, the signal substitution logic is as follows: when a sensor fails, the system automatically calls the normal sensor signal at its symmetrical position and reconfigures it according to the weighting algorithm preset by the weighing system to ensure that the total weight data error is ≤±1%, which meets the metering requirements of the continuous casting process.

[0013] Furthermore, the reconfiguration process of the weight algorithm is as follows: The system determines the specific location of the faulty sensor by real-time monitoring of the fluctuation range, stability index, and historical data model of the sensor output signal, and locates the normal sensor at its symmetrical position. Based on the design parameters of the continuous casting equipment, including the mechanical distribution of the scale structure, the rated load of the sensors, and historical calibration data, the basic weight of each sensor in the total weight calculation is determined. ; If the weight of the faulty sensor is The weight of a normally positioned symmetrical sensor is Then calculate the compensation coefficient. ; Acquire real-time signal values ​​from sensors at symmetrical positions Through formula Calculate the compensated signal value; Compensated signal value With other normal sensor signals By basic weight Perform a weighted summation, i.e., the total weight:

[0014] in, Include The calculated total weight If the error exceeds ±1% when compared with the preset standard weight range, then the error value will be used as the basis for the calculation. Dynamically adjust compensation coefficient Repeat the above steps until the error requirement is met.

[0015] Furthermore, the digital junction box also has a built-in adaptive anti-interference filtering unit. This unit monitors the intensity of environmental electromagnetic interference in real time, with a frequency range of 50Hz-1MHz, and dynamically adjusts the filtering parameters. The adjustable frequency range is 0.1Hz-10Hz. When the interference intensity exceeds the preset threshold, i.e. ≥80dBμV / m, it automatically switches to a high-order filtering mode to ensure that the signal-to-noise ratio of the sensor's analog signal transmission is ≥60dB.

[0016] Furthermore, the digital weighing instrument integrates a remote diagnostic communication module, which supports establishing a connection with the back-end monitoring platform via Ethernet or 4G / 5G network. It can upload sensor operating data, fault records, and weight measurement data in real time. The back-end platform can remotely issue fault handling strategies, including custom replacement weights and filter parameter adjustment instructions, to achieve centralized monitoring and remote maintenance of multiple devices.

[0017] Furthermore, the weighing sensor group is equipped with a temperature adaptive drift compensation module. This module is electrically connected to the digital junction box, collects the ambient temperature at the sensor installation location in real time, and dynamically corrects the sensor output signal according to the preset temperature-drift curve. When the ambient temperature changes within the range of -20℃ to 120℃, the signal drift of a single sensor is ≤ ±0.02%FS, ensuring the stability of measurement accuracy under high-temperature conditions.

[0018] This invention provides a fuse-type weighing sensing system based on a digital junction box, which has the following advantages: 1. This fuse-type weighing sensor system based on a digital junction box, through the use of a compatible fast-blow fuse, achieves a fault response time of ≤50ms. It can immediately cut off the circuit of the faulty sensor, completely solving the defect of mutual damage, ensuring the normal operation of other sensors. Moreover, it can complete the entire process of fault location, shielding, signal replacement, and data output through the digital weighing instrument without stopping the pouring process. It solves the contradiction that manual online fault diagnosis is impossible in high-temperature scenarios, minimizing the impact of faults on production.

[0019] 2. This fuse-type weighing sensor system based on a digital junction box can dynamically adjust the filtering strategy according to the intensity of electromagnetic interference through an adaptive anti-interference filtering unit. While ensuring signal response speed, it improves the signal-to-noise ratio by ≥25%, solving the metering fluctuation problem caused by strong electromagnetic interference in the continuous casting workshop. Moreover, the remote diagnostic communication module breaks the limitations of time and space, supports centralized monitoring of multiple devices, fault early warning and remote handling, reducing the number of on-site maintenance. Furthermore, the temperature adaptive drift compensation module suppresses the high-temperature drift of the sensor to ≤0.02%FS, ensuring the long-term metering accuracy of the system in the full temperature range of -20℃ to 120℃, thus extending its service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the entire process from signal acquisition to metering output of a fuse-type weighing sensor system based on a digital junction box according to the present invention. Figure 2 This is a schematic diagram illustrating the entire process of anti-interference, remote control, and temperature drift compensation of a fuse-type weighing sensor system based on a digital junction box according to the present invention. Detailed Implementation

[0021] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0022] like Figures 1-2 As shown, the present invention provides a technical solution: a fuse-type weighing sensing system based on a digital junction box, comprising a digital junction box, a weighing sensor group, and a digital weighing instrument; The weighing sensor group consists of four analog high-temperature weighing sensors, which are used to collect analog signals of molten steel weight in a high-temperature environment. Specifically, the weighing sensor group is composed of four analog high-temperature weighing sensors with a temperature resistance range of ≥120℃, which are suitable for the high-temperature working environment of the continuous casting platform. They are used to directly collect analog signals of molten steel weight in the ladle or tundish. The signal output terminal of each sensor is connected to an independent bridge circuit of the digital junction box to ensure the independence of signal transmission. The digital junction box is equipped with an independent power supply circuit corresponding to each weighing sensor. Each power supply circuit is connected in series with a fuse with a capacity of 1.2-1.5 times the rated operating current of the corresponding weighing sensor. The digital junction box also has a built-in digital chip with a 16-bit or higher A / D conversion accuracy, which is used to convert analog weight signals into digital signals.

[0023] The weighing sensors correspond one-to-one with the bridge circuit of the digital junction box and are electrically connected. The digital junction box establishes bidirectional communication with the digital weighing instrument through an RS485 communication interface.

[0024] The digital weighing instrument is used to receive digital signals from each weighing sensor in real time, record signal data, locate faulty sensors, shield faulty sensor signals, and call up the signals of normal weighing sensors at symmetrical positions to reconfigure and output weight data that meets production requirements. The fuse is a fast-blow type. When the signal cable of the corresponding load cell is short-circuited or the sensor itself is damaged, the fuse response time is ≤50ms, cutting off the excitation voltage output of the bridge circuit and preventing the fault from spreading to other bridge circuits. The digital chip is an STM32 series microcontroller, which integrates a signal amplification module and an anti-interference filter unit. It can amplify the weak analog signal output by the load cell and then perform digital conversion with a conversion error of ≤±0.01%. The digital weighing instrument features a touchscreen interface that displays the signal values, fault status, and total system weight data of each weighing sensor in real time. The fault status includes the fault number and the time of occurrence, and supports manual or automatic disabling of faulty sensors. The digital weighing instrument has a built-in fault diagnosis module that monitors whether the sensor signal is interrupted and whether the signal amplitude exceeds a preset threshold (±10% of the rated signal value) to accurately identify the faulty sensor number and fault type, which is either short circuit or damage. The signal substitution logic is as follows: when a sensor fails, the system automatically calls the normal sensor signal at its symmetrical position and reconfigures it according to the weighting algorithm preset by the weighing system to ensure that the total weight data error is ≤±1%, which meets the metering requirements of the continuous casting process. The reconfiguration process for the weighting algorithm is as follows: The system determines the specific location of the faulty sensor by real-time monitoring of the fluctuation range, stability index, and historical data model of the sensor output signal, and locates the normal sensor at its symmetrical position. Based on the design parameters of the continuous casting equipment, including the mechanical distribution of the scale structure, the rated load of the sensors, and historical calibration data, the basic weight of each sensor in the total weight calculation is determined. ; If the weight of the faulty sensor is The weight of a normally positioned symmetrical sensor is Then calculate the compensation coefficient. ; Acquire real-time signal values ​​from sensors at symmetrical positions Through formula Calculate the compensated signal value; Compensated signal value With other normal sensor signals By basic weight Perform a weighted summation, i.e., the total weight:

[0025] in, Include The calculated total weight If the error exceeds ±1% when compared with the preset standard weight range, then the error value will be used as the basis for the calculation. Dynamically adjust compensation coefficient Repeat the above steps until the error requirement is met.

[0026] Example 1 provides a fuse-type weighing sensor system based on a digital junction box, applied to the ladle weighing scenario of the CSP continuous casting platform at Lianggong Steel (the sensor installation location temperature is approximately 80-100℃). The specific structure is as follows: Weighing sensor group: It adopts 4 analog high temperature weighing sensors (model: YZC-320, rated operating current 0.3A, temperature resistance 120℃, measuring range 0-50t). The signal output terminal of the sensor is connected to the four-way power supply circuit of the digital junction box through a high temperature shielded cable to ensure stable signal transmission in high temperature environment.

[0027] Digital junction box: Internally equipped with 4 independent power supply circuits, each power supply circuit is connected in series with a 0.4A fast-blow fuse (0.3A × 1.33 times, to meet the 1.2-1.5 times rated current selection standard); the built-in digital chip is STM32F103, with 16-bit A / D conversion accuracy, conversion error ≤ ±0.01%, and integrated anti-interference filter unit, which can effectively suppress electromagnetic interference in high-temperature environments; the junction box shell is made of flame-retardant ABS material, with a temperature resistance range of -20℃~120℃, and has an RS485 communication interface (with surge protection) on the side, which connects to the digital weighing instrument in the central control room through a shielded cable, with a communication distance ≤100 meters;

[0028] Digital Weighing Instrument: This instrument uses a touchscreen digital display (model: XK3190-DS3), supporting RS485 communication protocol. The touchscreen interface displays real-time total weight data (accuracy 0.1t), real-time signal values ​​of four sensors (mV level), a fault status indicator area, and operation buttons. The instrument has a built-in fault diagnosis algorithm. When the signal cable of sensor 2 is short-circuited by molten steel, the corresponding 0.4A fuse in the bridge circuit will blow within 30ms. After the digital chip detects the signal interruption, it transmits the fault information ("Sensor 2 short-circuited, occurrence time") via RS485 communication. The signal "2024-XX-XX 12:10:11" is transmitted to the instrument. The operator can automatically process the signal via touch screen. The instrument immediately disables sensor 2 and calls the signal from sensor 4 at its symmetrical position. The weighing system is reconfigured according to the preset weighting algorithm (sensor 4 signal amplitude × 1.05 correction coefficient to compensate for the force difference at the symmetrical position). The weight data output is restored within 10 seconds (error ≤ ±0.5t), without the need to stop casting. After continuous casting is stopped, the maintenance personnel can accurately replace sensor 2 and the damaged cable according to the fault information recorded by the instrument, shortening the maintenance time to less than 30 minutes. The workflow of this embodiment is as follows: Normal operating condition: Four analog high-temperature load cells collect analog signals of molten steel weight (0-20mV) and transmit them to the corresponding power supply circuit of the digital junction box; the digital chip amplifies the analog signals and converts them into 16-bit digital signals, which are then transmitted to the digital weighing instrument via RS485 communication; the instrument processes and summarizes the data and outputs the total weight data to guide continuous casting production; Fault occurrence status: The signal cable of sensor 2 was burned and short-circuited by molten steel. The current in this circuit instantly increased to 0.8A, exceeding the rated capacity of the fuse (0.4A). The fuse melted quickly within 30ms, cutting off the excitation voltage supply to sensor 2 and preventing the fault from affecting the other 3 sensors. The digital chip detected the signal interruption of sensor 2, immediately marked the fault status and transmitted it to the digital weighing instrument. Fault handling status: After receiving a fault signal, the digital weighing instrument will display a pop-up window on the touch screen indicating that sensor 2 is short-circuited, and will automatically trigger the signal replacement program; it will call the real-time signal of sensor 4, complete the weight compensation according to the correction coefficient, reconfigure the weighing algorithm, and output stable total weight data within 10 seconds; the system will continue to run until the continuous casting stops, and the maintenance personnel will complete the precise maintenance according to the fault information recorded by the instrument. Based on the above description, this invention, through the use of a compatible fast-blow fuse, enables a fault response time of ≤50ms, which can immediately cut off the faulty sensor circuit, completely solving the defect of mutual damage and ensuring the normal operation of other sensors. Moreover, without stopping the pouring process, the entire process of fault location, shielding, signal replacement, and data output can be completed through a digital weighing instrument. This solves the contradiction that manual online fault diagnosis is impossible in high-temperature scenarios, minimizing the impact of faults on production.

[0029] The digital junction box also has a built-in adaptive anti-interference filtering unit. This unit monitors the intensity of environmental electromagnetic interference in real time, with a frequency range of 50Hz-1MHz, and dynamically adjusts the filtering parameters. The adjustable frequency range is 0.1Hz-10Hz. When the interference intensity exceeds the preset threshold, i.e. ≥80dBμV / m, it automatically switches to a high-order filtering mode to ensure that the signal-to-noise ratio of the sensor's analog signal transmission is ≥60dB. Specifically, the adaptive anti-interference filtering unit is electrically connected to the digital chip and adopts an IIR infinite impulse response filtering architecture. It has a built-in electromagnetic interference detection sensor that can collect the electromagnetic interference intensity around the continuous casting platform in real time. When the detected interference intensity is below 80dBμV / m, the filtering unit operates in a low-order filtering mode (cutoff frequency 5Hz) to ensure signal response speed. When the interference intensity is ≥80dBμV / m, it automatically switches to a high-order filtering mode (cutoff frequency 0.5Hz) and enhances the filtering depth. At the same time, it retains the dynamic change characteristics of the sensor signal and avoids weight data lag caused by over-filtering. This design specifically solves the problem of strong electromagnetic interference generated by equipment such as electric arc furnaces and frequency converters in the continuous casting workshop, ensuring the pure transmission of analog signals in complex electromagnetic environments. The digital weighing instrument integrates a remote diagnostic communication module, which supports establishing a connection with the back-end monitoring platform via Ethernet or 4G / 5G network. It can upload sensor operating data, fault records and weight measurement data in real time. The back-end platform can remotely issue fault handling strategies, including custom replacement weights and filter parameter adjustment instructions, to realize centralized monitoring and remote maintenance of multiple devices. Specifically, the remote diagnostic communication module integrates an RJ45 Ethernet interface and a 4G / 5G card slot, supporting industrial communication protocols such as ModbusTCP and MQTT. It can upload data to the background monitoring platform at preset intervals (adjustable from 1s to 60s), including real-time signal values ​​of each sensor, temperature data, fault codes, weight output values, and equipment runtime. The background monitoring platform has data storage (≥1 year), trend analysis, and anomaly warning functions. When the system experiences three consecutive minor faults (such as signal fluctuations exceeding ±5% of the rated value), the platform automatically sends a warning message to maintenance personnel. Maintenance personnel can remotely view fault details through the platform and issue custom replacement weights (such as adjusting the compensation coefficient of symmetrical sensors for off-center load conditions), filtering parameters, and other instructions based on production conditions. After the instructions are received through the communication module, the digital weighing instrument executes them in real time, realizing intelligent maintenance without on-site supervision. The weighing sensor group is equipped with a temperature adaptive drift compensation module. This module is electrically connected to the digital junction box, collects the ambient temperature at the sensor installation location in real time, and dynamically corrects the sensor output signal according to the preset temperature-drift curve. When the ambient temperature changes within the range of -20℃ to 120℃, the signal drift of a single sensor is ≤ ±0.02%FS, ensuring the stability of measurement accuracy under high temperature conditions. Specifically, the temperature adaptive drift compensation module uses a PT1000 high-precision temperature sensor, which is installed on the housing surface of each analog high-temperature weighing sensor and connected in parallel with the sensor signal output terminal. The module has a built-in storage unit that pre-stores the temperature-drift characteristic curve of the sensor in the range of -20℃ to 120℃ (obtained through high-temperature calibration before leaving the factory). During operation, the ambient temperature is collected in real time, and the corresponding drift compensation amount is queried according to the temperature value. The mV-level analog signal output by the sensor is linearly corrected through hardware circuitry. For example, when the ambient temperature rises from 80℃ to 100℃, the inherent drift of the sensor is about 0.1%FS. The compensation module outputs a correction signal of -0.08mV to suppress the actual drift to within the range of ≤0.02%FS, thus solving the problem of accuracy decay of the sensor during long-term operation in high-temperature environments. Example 2: The adaptive anti-interference filtering unit of the digital junction box uses TI's OPA847 operational amplifier to build an IIR filtering circuit. The electromagnetic interference detection sensor is model AD8313, with a detection frequency range of 50Hz-1MHz. When the electric arc furnace in the continuous casting workshop is started, the surrounding electromagnetic interference intensity increases to 95dBμV / m. The filtering unit automatically switches to a high-order filtering mode (cutoff frequency 0.5Hz). At this time, the signal-to-noise ratio of the sensor signal increases from 52dB to 65dB, and the weight data fluctuation range decreases from ±0.3t to ±0.1t, ensuring the measurement stability under strong interference conditions. The remote diagnostic communication module integrates a Huawei ME909S-8214G module and an RTL8201F Ethernet chip. The background monitoring platform is developed using the KingView configuration software and deployed on the central control server in the CSP continuous casting workshop of Lianggong Steel. When the system is running, it uploads data to the platform every 5 seconds. Maintenance personnel can view the real-time operating status of the three ladle scales through a mobile APP. When sensor 3 showed intermittent signal fluctuations (fault code F03), the platform automatically issued an early warning and pushed the fault data curve. The maintenance personnel remotely issued a command to adjust the filter cutoff frequency (from 5Hz to 3Hz), and the fault was resolved within 1 minute without on-site operation, which improved the maintenance response efficiency. The PT1000 temperature sensor in the temperature adaptive drift compensation module has an accuracy class of A (±0.15℃). The pre-stored temperature-drift curve is obtained through high-temperature chamber calibration. At six temperature points of -20℃, 25℃, 60℃, 80℃, 100℃, and 120℃, the output error of the sensor is recorded and fitted into a linear compensation equation y=0.005x-0.02 (where x is the temperature value and y is the compensation voltage value). In this embodiment, when the temperature at the sensor installation location rises from 85℃ to 98℃, the compensation module calculates a correction voltage of -0.079mV according to the equation. This correction voltage is then superimposed onto the sensor output signal through hardware circuitry. After conversion by a digital chip, the weight data error is corrected from 0.09%FS to 0.015%FS, meeting the long-term measurement accuracy requirements of the continuous casting process. Workflow integration: Under normal operating conditions, the temperature adaptive drift compensation module corrects the sensor signal in real time, the adaptive anti-interference filtering unit dynamically adjusts the filtering parameters according to the intensity of electromagnetic interference, and the remote diagnostic communication module continuously uploads data to the back-end platform; when a fault occurs, the back-end platform receives the fault information synchronously, and maintenance personnel can choose to remotely issue processing instructions or arrange on-site repairs. Based on the above description, this invention uses an adaptive anti-interference filtering unit to dynamically adjust the filtering strategy according to the intensity of electromagnetic interference. While ensuring signal response speed, it improves the signal-to-noise ratio by ≥25%, solving the metering fluctuation problem caused by strong electromagnetic interference in the continuous casting workshop. Furthermore, the remote diagnostic communication module breaks the limitations of time and space, supports centralized monitoring of multiple devices, fault early warning, and remote handling, reducing the number of on-site maintenance operations. Moreover, the temperature adaptive drift compensation module suppresses the high-temperature drift of the sensor to ≤0.02%FS, ensuring the long-term metering accuracy of the system within the full temperature range of -20℃ to 120℃, thereby extending the service life.

[0030] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A fuse-type weighing sensing system based on a digital junction box, characterized in that: Includes digital junction boxes, load cell arrays, and digital weighing instruments; The weighing sensor group consists of four analog high-temperature weighing sensors, used to collect analog signals of molten steel weight in a high-temperature environment. The digital junction box is equipped with an independent power supply circuit corresponding to each weighing sensor. Each power supply circuit is connected in series with a fuse with a capacity of 1.2-1.5 times the rated operating current of the corresponding weighing sensor. The digital junction box also has a built-in digital chip with a 16-bit or higher A / D conversion accuracy, which is used to convert analog weight signals into digital signals. The weighing sensors correspond one-to-one with the bridge circuit of the digital junction box and are electrically connected. The digital junction box establishes bidirectional communication with the digital weighing instrument through an RS485 communication interface. The digital weighing instrument is used to receive digital signals from each weighing sensor in real time, record signal data, locate faulty sensors, shield faulty sensor signals, and call up the signals of normal weighing sensors at symmetrical positions to reconfigure and output weight data that meets production requirements. The fuse is a fast-blow type. When the signal cable of the corresponding load cell is short-circuited or the sensor itself is damaged, the fuse response time is ≤50ms, cutting off the excitation voltage output of the bridge circuit and preventing the fault from spreading to other bridge circuits. The digital chip is an STM32 series microcontroller, which integrates a signal amplification module and an anti-interference filtering unit. It can amplify the weak analog signal output by the weighing sensor and then perform digital conversion with a conversion error of ≤±0.01%. The digital weighing instrument has a touch screen structure. The operation interface displays the signal values, fault status and total weight data of each weighing sensor in real time. The fault status includes the fault number and the time of fault occurrence. It supports manual or automatic shielding of faulty sensors. The digital weighing instrument has a built-in fault diagnosis module. By monitoring whether the sensor signal is interrupted and whether the signal amplitude exceeds a preset threshold (±10% of the rated signal value), it accurately identifies the faulty sensor number and fault type, which is short circuit or damage. The signal substitution logic is as follows: when a sensor fails, the system automatically calls the normal sensor signal at its symmetrical position and reconfigures it according to the weighting algorithm preset by the weighing system to ensure that the total weight data error is ≤±1% and meets the metering requirements of the continuous casting process. The reconfiguration process of the weight algorithm is as follows: The system determines the specific location of the faulty sensor by real-time monitoring of the fluctuation range, stability index, and historical data model of the sensor output signal, and locates the normal sensor at its symmetrical position. Based on the design parameters of the continuous casting equipment, including the mechanical distribution of the scale structure, the rated load of the sensors, and historical calibration data, the basic weight of each sensor in the total weight calculation is determined. ; If the weight of the faulty sensor is The weight of a normally positioned symmetrical sensor is Then calculate the compensation coefficient. ; Acquire real-time signal values ​​from sensors at symmetrical positions Through formula Calculate the compensated signal value; Compensated signal value With other normal sensor signals By basic weight Perform a weighted summation, i.e., the total weight: in, Include The calculated total weight If the error exceeds ±1% when compared with the preset standard weight range, then the error value will be used as the basis for the calculation. Dynamically adjust compensation coefficient Repeat the above steps until the error requirement is met.

2. The fuse-type weighing sensing system based on a digital junction box according to claim 1, characterized in that: The digital junction box also has a built-in adaptive anti-interference filtering unit. This unit monitors the intensity of environmental electromagnetic interference in real time, with a frequency range of 50Hz-1MHz, and dynamically adjusts the filtering parameters. The adjustable frequency range is 0.1Hz-10Hz. When the interference intensity exceeds the preset threshold, i.e. ≥80dBμV / m, it automatically switches to a high-order filtering mode to ensure that the signal-to-noise ratio of the sensor's analog signal transmission is ≥60dB.

3. The fuse-type weighing sensing system based on a digital junction box according to claim 1, characterized in that: The digital weighing instrument integrates a remote diagnostic communication module, which supports establishing a connection with the back-end monitoring platform via Ethernet or 4G / 5G network. It can upload sensor operating data, fault records and weight measurement data in real time. The back-end platform can remotely issue fault handling strategies, including custom replacement weights and filter parameter adjustment instructions, to realize centralized monitoring and remote maintenance of multiple devices.

4. The fuse-type weighing sensing system based on a digital junction box according to claim 1, characterized in that: The weighing sensor group is equipped with a temperature adaptive drift compensation module. This module is electrically connected to the digital junction box, collects the ambient temperature at the sensor installation location in real time, and dynamically corrects the sensor output signal according to the preset temperature-drift curve. When the ambient temperature changes within the range of -20℃ to 120℃, the signal drift of a single sensor is ≤ ±0.02%FS, ensuring the stability of measurement accuracy under high-temperature conditions.

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