Battery management system and method of data acquisition device

Abstract

The invention relates to a battery management system and method of a data acquisition device. The battery management method comprises the steps that the battery temperature and the circuit board temperature of the data acquisition device are monitored in real time, corresponding adjustment strategies are executed in a graded mode, and when the battery temperature exceeds a first preset threshold value, a first-stage adjustment strategy is executed and comprises the step of closing a high-power-consumption satellite positioning function; when the battery temperature exceeds a second preset threshold value higher than the first preset threshold value, or the circuit board temperature exceeds a third preset threshold value, executing a second-stage regulation strategy, including reduction of wireless communication power consumption; when the battery temperature exceeds a fourth preset threshold value which is higher than the second preset threshold value, executing a third-stage regulation strategy which comprises the steps of cutting off battery power supply and switching to standby capacitor power supply, and entering a low-power-consumption mode at the same time; and when the temperature of the circuit board exceeds a fifth preset threshold value higher than the third preset threshold value, a fourth-stage adjustment strategy is executed, and the fourth-stage adjustment strategy is to disconnect the main power supply of the equipment through the passive temperature control switch.

Description

Technical Field

[0001] This invention relates to the field of mold data acquisition technology, and specifically to a battery management system and method for a data acquisition device. Background Technology

[0002] In high-temperature molding manufacturing fields such as injection molding, die casting, and forging, real-time data acquisition and status monitoring of mold production are crucial for achieving digital and intelligent production. With technological advancements, electronic data acquisition devices integrating sensing, counting, positioning, and wireless communication functions have become increasingly common. However, when these devices are applied to high-temperature molds with surface temperatures consistently exceeding 80°C or even 150°C, their core energy storage unit—the battery—faces severe reliability and safety challenges. This has become a bottleneck restricting the widespread application of this technology in high-temperature environments.

[0003] In existing technologies, data acquisition devices typically operate in a continuous full-function mode, and their battery management strategies are relatively simple or absent, mainly in the following ways: Lack of proactive thermal management awareness: Conventional equipment designs typically prioritize functional implementation, failing to recognize "high temperature" as a core operating condition requiring dynamic management. Internal batteries and circuit boards operate continuously in high-temperature environments, generating and accumulating heat. The system lacks a real-time temperature-based feedback adjustment mechanism, resulting in components being under constant thermal stress.

[0004] Lack of graded power consumption regulation mechanism: When faced with temperature rise, existing devices typically only have two states: "normal operation" and "overheat shutdown," lacking intermediate, gradual power consumption regulation capabilities. Once shutdown is triggered, production monitoring is completely interrupted; if shutdown is not initiated, the equipment may be exposed to damage risks. This "either / or" model cannot simultaneously meet the core requirements of equipment safety and data continuity in high-temperature environments.

[0005] The protection methods are simple and passive: Some designs may use simple temperature switches for final power-off protection, but this is a passive hardware protection that is a post-event remedy. Once it is activated, the power is completely cut off, and it cannot realize active management functions such as early warning, derating, and power switching. The level of intelligence is low.

[0006] Therefore, the existing battery management solutions for data acquisition devices are difficult to adapt to the harsh working conditions of high-temperature molds, and generally suffer from problems such as short equipment life, poor reliability, low safety, and easy data interruption. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a battery management system and method for a data acquisition device, aiming to solve the problems that existing battery management solutions for data acquisition devices are difficult to adapt to the harsh working conditions of high-temperature molds, and generally suffer from short equipment life, poor reliability, low safety, and easy data interruption.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a battery management method for a data acquisition device, comprising: Real-time monitoring of the battery temperature and circuit board temperature of the data acquisition device; Based on the monitored temperature exceeding different preset thresholds, corresponding adjustment strategies are implemented in stages, including: When the battery temperature exceeds a first preset threshold, the first-level adjustment strategy is executed, which includes turning off the high-power satellite positioning function; When the battery temperature exceeds a second preset threshold that is higher than the first preset threshold, or the circuit board temperature exceeds a third preset threshold, a second-level adjustment strategy is executed, which includes reducing wireless communication power consumption. When the battery temperature exceeds a fourth preset threshold higher than the second preset threshold, a third-level adjustment strategy is executed. The third-level adjustment strategy includes disconnecting the battery power supply and switching to the backup capacitor power supply, while entering a low-power mode. When the circuit board temperature exceeds the fifth preset threshold above the third preset threshold, the fourth-level adjustment strategy is executed, which is to disconnect the main power supply of the device through a passive temperature control switch.

[0009] Furthermore, the first-level adjustment strategy is to disable GPS / BeiDou positioning while retaining base station positioning and WiFi Scan functions.

[0010] Furthermore, the second-level adjustment strategy is to reduce the transmit power of the wireless communication module and / or extend its data reporting interval.

[0011] Furthermore, the third-level regulation strategy also includes: Reduce the data acquisition frequency to the preset minimum value, disable wireless communication and base station positioning but retain the Wi-Fi Scan function, and store the data locally.

[0012] Furthermore, after implementing the third-level adjustment strategy, when the circuit board temperature drops to the battery recovery threshold, battery power is restored. After the fourth-level regulation strategy is implemented, when the circuit board temperature drops to the system recovery threshold, the temperature control switch automatically closes, and the device restarts operation powered by the backup capacitor.

[0013] Furthermore, the first preset threshold is 85°C, the second preset threshold is 95°C, the fourth preset threshold is 110°C, the third preset threshold is 110°C, and the fifth preset threshold is 125°C; the battery recovery threshold is 95°C, and the system recovery threshold is 110°C.

[0014] Secondly, the present invention also provides a battery management system for a data acquisition device for implementing the above method, comprising: Temperature monitoring module, used to monitor battery temperature and circuit board temperature; The power consumption control module includes a wireless communication unit, a positioning unit, and a data acquisition unit; The power management module is connected to the battery and backup capacitor, and a passive temperature control switch is connected in series. The control module is connected to the temperature monitoring module, the power consumption control module, and the power management module respectively, and is configured to execute the above method steps.

[0015] Furthermore, the temperature monitoring module includes: A high-precision analog-to-digital converter (ADC) is provided, wherein the ADC communicates with the control module via a serial peripheral interface or an integrated circuit bus, and the ADC has multiple differential or single-ended analog input channels. The first thermistor sensing unit is connected to the first input channel of the high-precision analog-to-digital converter and is disposed on the circuit board of the data acquisition device or close to the key heating element of the circuit board for sensing the temperature of the circuit board. The second thermistor sensing unit is connected to the second input channel of the high-precision analog-to-digital converter and is disposed on the battery surface or inside the battery compartment of the data acquisition device for sensing battery temperature. The high-precision analog-to-digital converter is configured to periodically sample the resistance values ​​of the first thermistor sensing unit and the second thermistor sensing unit, and convert them into digital temperature signals to be output to the control module.

[0016] Furthermore, the power module includes: Battery connector, used to connect the battery; A backup capacitor, serving as a backup energy storage unit, is connected in parallel with the battery at the power supply node; A passive temperature control switch is connected in series in the power supply circuit of the battery; A power conversion circuit, whose input terminal is connected to the power supply node, is used to provide a stable operating voltage for the control module, wireless communication module and data acquisition module; The control module is configured to disconnect the battery from the power supply node and switch to power supply from the backup capacitor when the battery temperature exceeds a preset threshold; the passive temperature control switch is used to automatically cut off the power supply circuit when the circuit board temperature exceeds its rated disconnection temperature.

[0017] Furthermore, the data acquisition unit includes: The sensing electrode is set in the fixed mold of the mold, forming a parallel plate capacitor with the moving mold of the mold. The capacitance detection unit is connected to the control module, the high-precision digital-to-analog converter and the sensing electrode, and includes a precision resistor for forming a first-order RC charging and discharging circuit with the parallel plate capacitor. The charging current is provided by the constant current power supply of the high-precision data converter. A voltage comparison unit, connected between the capacitor detection unit and the control module, includes a reference voltage circuit composed of high-precision voltage divider resistors and a voltage comparison circuit composed of a precision operational amplifier, used to monitor the time point when the voltage of the first-order RC charging circuit rises to the reference voltage; The control module is configured to calculate the time constant reflecting the displacement of the moving mold by controlling the charging and discharging of the RC circuit and sampling it through the voltage comparison unit; and to execute an anti-interference algorithm based on statistical analysis on the continuously calculated time constant sequence to accurately determine the opening and closing state of the mold.

[0018] The battery management system and method for a data acquisition device described in this invention have the following advantages: Based on the real-time temperature of the battery and circuit board, a four-level progressive dynamic adjustment is implemented. This strategy forms a complete defense chain, from functional degradation (Level 1 adjustment strategy), active power consumption reduction (Level 2 adjustment strategy), core protection and maintenance (Level 3 adjustment strategy), to ultimate hardware protection (Level 4 adjustment strategy). This breaks the traditional single mode of "either full-function operation or overheating shutdown" for equipment, ensuring a dynamic optimal balance between equipment safety, data continuity, and core function maintenance under high-temperature conditions. In particular, the "disconnecting the battery and switching to capacitor power supply" in the Level 3 strategy can maintain core sensing while protecting the battery, avoiding data acquisition interruptions caused by direct power failure. Attached Figure Description

[0019] Figure 1 This is a schematic flowchart of the battery management method of the data acquisition device of the present invention; Figure 2 This is a structural block diagram of the battery management of the data acquisition device of the present invention; Figure 3 This is a schematic diagram of the circuit structure of the temperature monitoring module of the present invention; Figure 4 This is a schematic diagram of the circuit structure of the power management module of the present invention; Figure 5 This is a schematic diagram of the circuit structure of the data acquisition unit and control module of the present invention; Figure 6 This is a schematic diagram of the circuit structure of the debugging interface unit of the present invention; Figure 7 This is a schematic diagram of the circuit structure of the positioning module of the present invention; Figure 8 This is a schematic diagram of the circuit structure of the communication unit of the present invention; Figure 9 This is a schematic diagram of the circuit structure of the user identification card interface circuit of the present invention; Figure 10 This is a schematic diagram of the circuit structure of the radio frequency antenna interface and matching network of the present invention; Figure 11 This is a schematic diagram of the communication interface level conversion circuit of the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 As shown, the present invention provides a battery management method for a data acquisition device, comprising: Real-time monitoring of battery and circuit board temperatures in the data acquisition device; Based on the monitored temperature exceeding different preset thresholds, corresponding adjustment strategies are implemented in stages, including: When the battery temperature exceeds the first preset threshold, the first-level regulation strategy is executed, which includes turning off the high-power satellite positioning function; When the battery temperature exceeds a second preset threshold that is higher than a first preset threshold, or the circuit board temperature exceeds a third preset threshold, a second-level adjustment strategy is executed. The second-level adjustment strategy includes reducing wireless communication power consumption. When the battery temperature exceeds the fourth preset threshold which is higher than the second preset threshold, the third-level adjustment strategy is executed. The third-level adjustment strategy includes disconnecting the battery power supply and switching to the backup capacitor power supply, while entering the low power mode. When the circuit board temperature exceeds the fifth preset threshold which is higher than the third preset threshold, the fourth-level adjustment strategy is executed, which is to disconnect the main power supply of the device through a passive temperature control switch.

[0022] Based on the real-time temperature of the battery and circuit board, a four-level progressive dynamic adjustment is implemented. This strategy forms a complete defense chain, from functional degradation (Level 1 adjustment strategy), active power consumption reduction (Level 2 adjustment strategy), core protection and maintenance (Level 3 adjustment strategy), to ultimate hardware protection (Level 4 adjustment strategy). This breaks the traditional single mode of "either full-function operation or overheating shutdown" for equipment, ensuring a dynamic optimal balance between equipment safety, data continuity, and core function maintenance under high-temperature conditions. In particular, the "disconnecting the battery and switching to capacitor power supply" in the Level 3 strategy can maintain core sensing while protecting the battery, avoiding data acquisition interruptions caused by direct power failure.

[0023] Furthermore, the first-level adjustment strategy is to disable GPS / BeiDou positioning while retaining base station positioning and WiFi Scan functions.

[0024] By prioritizing the shutdown of the satellite positioning module (GPS / BeiDou), which consumes the most power and is not essential for high-temperature monitoring, while retaining the lower-power base station positioning and WiFi Scan functions, the most significant initial cooling effect is achieved with minimal functional cost (a slight decrease in positioning accuracy). This strategy specifically identifies and eliminates the largest wireless power consumption heat source, buying time and space for subsequent strategies to take effect.

[0025] Furthermore, the second-level adjustment strategy is to reduce the transmit power of the wireless communication module and / or extend its data reporting interval.

[0026] By reducing wireless transmission power and extending data reporting intervals, the overall heat generation of the system is systematically reduced from both "power consumption per unit time" and "average power consumption" dimensions. This is a "fine-tuning" strategy that can effectively cope with continuous, non-acute heat accumulation, slow down the temperature rise trend, and demonstrate the intelligence and economy of the management strategy, while avoiding data flow interruption caused by directly shutting down functions.

[0027] Furthermore, the third-level regulatory strategy also includes: Reduce the data acquisition frequency to the preset minimum value, disable wireless communication and base station positioning but retain the Wi-Fi Scan function, and store the data locally.

[0028] In extreme situations where the main power must be cut off, the device maintains basic data awareness by "reducing to the lowest sampling frequency," ensures no data loss by "disabling communication but maintaining local storage," and maintains minimum environmental awareness by "retaining Wi-Fi scanning." This series of operations demonstrates the "extreme survival" design philosophy, maximizing the preservation of the device's core value (data) and post-recovery context information while ensuring absolute battery safety.

[0029] Furthermore, after implementing the third-level regulation strategy, when the circuit board temperature drops to the battery recovery threshold, battery power is restored. After the fourth-level regulation strategy is implemented, when the circuit board temperature drops to the system recovery threshold, the temperature control switch automatically closes, and the equipment restarts with power from the backup capacitor.

[0030] The system's adaptive recovery capability has been enhanced, creating a complete "trigger-protection-recovery" closed loop in the management strategy. When the high-temperature threat subsides (temperature drops to the battery recovery threshold), the system automatically returns to normal power supply without manual intervention. When the high-temperature threat is resolved (temperature drops to the system recovery threshold), the temperature control switch automatically closes, and the device restarts operation powered by the backup capacitor, thus activating the system's hibernation mode. This significantly improves device availability and user experience, enabling intelligent management and allowing the device to operate reliably and repeatedly in dynamically changing high-temperature environments.

[0031] In some specific embodiments, the first preset threshold is 85°C, the second preset threshold is 95°C, the fourth preset threshold is 110°C, the third preset threshold is 110°C, and the fifth preset threshold is 125°C; the battery recovery threshold is 95°C, and the system recovery threshold is 110°C.

[0032] It provides verified and specific temperature threshold parameters. The various thresholds in the method are specified as 85℃, 95℃, 110℃, 125℃, etc., and these values ​​are optimal balance points determined based on battery chemistry, component specifications, and extensive experimental data. It protects the key implementation details of the invention, transforming the technical solution from theory into a reliable industrially applicable solution.

[0033] like Figure 2 As shown, the present invention also provides a battery management system for a data acquisition device for implementing the above method, comprising: Temperature monitoring module, used to monitor battery temperature and circuit board temperature; The power consumption control module includes a wireless communication unit, a positioning unit, and a data acquisition unit; The power management module is connected to the battery and backup capacitor, and a passive temperature control switch is connected in series. The control module, which is connected to the temperature monitoring module, the power consumption control module, and the power management module respectively, is configured to execute the above method steps.

[0034] By mapping abstract algorithms to specific physical modules (temperature monitoring, power consumption control, power management, and central control), a dedicated system with hardware and software collaboration is formed.

[0035] like Figure 3 As shown, in some specific embodiments, the temperature monitoring module includes: The high-precision analog-to-digital converter communicates with the control module through a serial peripheral interface or integrated circuit bus, and has multiple differential or single-ended analog input channels. The first thermistor sensing unit is connected to the first input channel of the high-precision analog-to-digital converter and is set on the circuit board of the data acquisition device or close to the key heating element of the circuit board to sense the temperature of the circuit board. The second thermistor sensing unit is connected to the second input channel of the high-precision analog-to-digital converter and is placed on the battery surface or inside the battery compartment of the data acquisition device to sense the battery temperature. The high-precision analog-to-digital converter is configured to periodically sample the resistance values ​​of the first and second thermistor sensing units and convert them into digital temperature signals, which are then output to the control module.

[0036] The solution employs an independent high-precision ADC combined with multiple thermistors, which, compared to using an MCU's built-in ADC, provides higher temperature measurement resolution and better anti-interference capabilities, ensuring the accuracy of the "temperature monitoring" data upon which the hierarchical strategy relies. This is the cornerstone of perception for the reliable operation of the entire intelligent management system.

[0037] like Figure 4 As shown, in some specific embodiments, the power module includes: Battery connector, used to connect the battery; The backup capacitor, as a backup energy storage unit, is connected in parallel with the battery at the power supply node; A passive temperature control switch is connected in series in the battery power supply circuit; The power conversion circuit, whose input terminal is connected to the power supply node, is used to provide a stable operating voltage for the control module, wireless communication module and data acquisition module. The control module is configured to disconnect the battery from the power supply node and switch to power supply by the backup capacitor when the battery temperature exceeds a preset threshold; the passive temperature control switch is used to automatically cut off the power supply circuit when the circuit board temperature exceeds its rated disconnect temperature.

[0038] The system clearly defines a dual-power architecture of "main battery + backup capacitor" and a dual protection mechanism of "software-controllable switch + passive temperature control switch". In particular, the passive temperature control switch, as the last physical line of defense independent of the software, can provide ultimate protection even in the event of control system failure, greatly improving the inherent safety of the entire system under extreme high-temperature conditions.

[0039] like Figure 5 As shown, in some specific embodiments, the data acquisition unit includes: The sensing electrode is set in the fixed mold of the mold, forming a parallel plate capacitor with the moving mold of the mold. The capacitance detection unit is connected to the control module, the high-precision digital-to-analog converter and the sensing electrode. It includes a precision resistor to form a first-order RC charging circuit with the parallel plate capacitor. The charging current is provided by the constant current power supply of the high-precision data converter. The voltage comparison unit, connected between the capacitor detection unit and the control module, includes a reference voltage circuit composed of high-precision voltage divider resistors and a voltage comparison circuit composed of precision operational amplifiers. It is used to monitor the time point when the voltage of the first-order RC charging circuit rises to the reference voltage. The control module is configured to calculate the time constant reflecting the displacement of the moving mold by controlling the charging and discharging of the RC circuit and sampling it through the voltage comparison unit; and to execute an anti-interference algorithm based on statistical analysis on the continuously calculated time constant sequence to accurately determine the opening and closing state of the mold.

[0040] This battery management system is strongly correlated and protected with the core data acquisition functions (capacitive sensing and anti-interference algorithms). The specific object and scenario served by this management system is clearly defined—capacitive monitoring of high-temperature molds. Simultaneously, the power savings and safety guarantees provided by the management strategy are implied, ultimately ensuring the long-term stable operation of this complex and sophisticated sensing algorithm in harsh environments.

[0041] like Figure 6 As shown, in some specific embodiments, the battery management system further includes: a debugging interface unit, connected to the control module, used for device program burning and online debugging; the control module initializes and calibrates the capacitor detection unit and the analog-to-digital conversion unit through the debugging interface unit.

[0042] like Figure 7 As shown, in some specific embodiments, the GPS / BeiDou positioning unit of the positioning module includes an antenna interface, an impedance matching network, and an RF filter. The antenna interface is connected to the RF input terminal of the positioning chip through the impedance matching network.

[0043] like Figures 8 to 11 As shown, in some specific embodiments, the wireless communication module includes: Communication unit; The user identification card interface circuit is connected to the identification terminal of the communication unit and is used to connect the user identification card. The interface circuit includes at least a power supply pin, a data pin, a clock pin, and a reset pin. The radio frequency antenna interface and matching network are connected to the radio frequency signal terminal of the communication unit to realize the transmission, reception and impedance matching of radio frequency signals.

[0044] The communication interface level conversion circuit between the communication unit and the control module is used to convert between the 3.3V interface voltage of the control module and the 1.8V interface voltage of the communication unit.

[0045] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A battery management method for a data acquisition device, characterized in that, include: Real-time monitoring of the battery temperature and circuit board temperature of the data acquisition device; Based on the monitored temperature exceeding different preset thresholds, corresponding adjustment strategies are implemented in stages, including: When the battery temperature exceeds a first preset threshold, the first-level adjustment strategy is executed, which includes turning off the high-power satellite positioning function; When the battery temperature exceeds a second preset threshold that is higher than the first preset threshold, or the circuit board temperature exceeds a third preset threshold, a second-level adjustment strategy is executed, which includes reducing wireless communication power consumption. When the battery temperature exceeds a fourth preset threshold higher than the second preset threshold, a third-level adjustment strategy is executed. The third-level adjustment strategy includes disconnecting the battery power supply and switching to backup capacitor power supply, while entering a low-power mode. After executing the third-level adjustment strategy, when the battery temperature drops to the battery recovery threshold, the battery power supply is restored. When the circuit board temperature exceeds the fifth preset threshold above the third preset threshold, a fourth-level adjustment strategy is executed. The fourth-level adjustment strategy is to disconnect the main power supply of the device through a passive temperature control switch. After the fourth-level adjustment strategy is executed, when the circuit board temperature drops to the system recovery threshold, the temperature control switch automatically closes, and the device restarts operation powered by a backup capacitor.

2. The battery management method of the data acquisition device according to claim 1, characterized in that, The first-level adjustment strategy is to disable GPS / BeiDou positioning while retaining base station positioning and WiFi Scan functions.

3. The battery management method according to claim 1, characterized in that, The second-level adjustment strategy is to reduce the transmit power of the wireless communication module and / or extend its data reporting interval.

4. The battery management method for the data acquisition device according to claim 1, characterized in that, The third-level regulation strategy also includes: Reduce the data acquisition frequency to the preset minimum value, disable wireless communication and base station positioning but retain the Wi-Fi Scan function, and store the data locally.

5. The battery management method for the data acquisition device according to claim 1, characterized in that, The first preset threshold is 85℃, the second preset threshold is 95℃, the fourth preset threshold is 110℃, the third preset threshold is 110℃, and the fifth preset threshold is 125℃; the battery recovery threshold is 95℃, and the system recovery threshold is 110℃.

6. A battery management system for implementing the method of any one of claims 1-5, characterized in that, include: A temperature monitoring module for monitoring battery temperature and circuit board temperature; wherein, the temperature monitoring module includes: A high-precision analog-to-digital converter (ADC) is provided, wherein the ADC communicates with the control module via a serial peripheral interface or an integrated circuit bus, and the ADC has multiple differential or single-ended analog input channels. The first thermistor sensing unit is connected to the first input channel of the high-precision analog-to-digital converter and is disposed on the circuit board of the data acquisition device or close to the key heating element of the circuit board for sensing the temperature of the circuit board. The second thermistor sensing unit is connected to the second input channel of the high-precision analog-to-digital converter and is disposed on the battery surface or inside the battery compartment of the data acquisition device for sensing battery temperature. The high-precision analog-to-digital converter is configured to periodically sample the resistance values ​​of the first thermistor sensing unit and the second thermistor sensing unit, and convert them into digital temperature signals to be output to the control module. The power consumption control module includes a wireless communication unit, a positioning unit, and a data acquisition unit; The power management module is connected to the battery and backup capacitor, and a passive temperature control switch is connected in series. The control module is connected to the temperature monitoring module, the power consumption control module, and the power management module respectively, and is configured to perform the steps of the method as described in any one of claims 1-5.

7. The battery management system of the data acquisition device according to claim 6, characterized in that, The power module includes: Battery connector, used to connect the battery; A backup capacitor, serving as a backup energy storage unit, is connected in parallel with the battery at the power supply node; A passive temperature control switch is connected in series in the power supply circuit of the battery; A power conversion circuit, whose input terminal is connected to the power supply node, is used to provide a stable operating voltage for the control module, wireless communication module and data acquisition module; The control module is configured to disconnect the battery from the power supply node and switch to power supply from the backup capacitor when the battery temperature exceeds a preset threshold; the passive temperature control switch is used to automatically cut off the power supply circuit when the circuit board temperature exceeds its rated disconnection temperature.

8. The battery management system of the data acquisition device according to claim 6, characterized in that, The data acquisition unit includes: The sensing electrode is set in the fixed mold of the mold, forming a parallel plate capacitor with the moving mold of the mold. The capacitance detection unit is connected to the control module, the high-precision digital-to-analog converter and the sensing electrode, and includes a precision resistor for forming a first-order RC charging circuit with the parallel plate capacitor. The charging current is provided by the constant current power supply of the high-precision data converter. A voltage comparison unit, connected between the capacitor detection unit and the control module, includes a reference voltage circuit composed of high-precision voltage divider resistors and a voltage comparison circuit composed of a precision operational amplifier, used to monitor the time point when the voltage of the first-order RC charging circuit rises to the reference voltage; The control module is configured to calculate the time constant reflecting the displacement of the moving mold by controlling the charging and discharging of the RC circuit and sampling it through the voltage comparison unit; and to execute an anti-interference algorithm based on statistical analysis on the continuously calculated time constant sequence to accurately determine the opening and closing state of the mold.

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