LED intelligent digital safety fence device and system

Abstract

The invention discloses an LED intelligent digital safety fence device and system, belongs to the technical field of intelligent safety monitoring, and remarkably improves the monitoring efficiency and management level of a safety fence through multi-sensor fusion and intelligent communication architecture design. The six-axis gyroscope sensor captures the physical posture change of the fence in real time, and the Bluetooth module is combined to scan the unique identifier of the safety equipment of the surrounding personnel, so that the dual perception of the abnormal state of the fence and the dynamic state of the personnel is realized; the programmable LED liquid crystal display screen dynamically displays maintenance operation information, safety signs and road guidance, the limitation that a traditional fence can only give an alarm or statically display is broken through, monitoring-warning-guiding integrated closed-loop management is formed, potential safety hazards are effectively prevented, and the field operation coordination efficiency is improved. A power supply scheme of seamless switching between an external power supply and a lithium battery pack is adopted, and a hierarchical communication mode of LoRa ad hoc network and Wi-Fi backhaul is combined, so that stable operation can still be ensured in an extreme power failure or complex environment.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent security monitoring, and specifically relates to an LED intelligent digital security fence device and system. Background Art

[0002] An intelligent security fence is a security protection system integrating advanced sensors, data processing units, and communication technologies, aiming to improve the safety management level of dangerous areas. This system can monitor the fence status in real time. Once an illegal intrusion, damage, or abnormal situation is detected, it immediately triggers an alarm and notifies the management personnel. The intelligent security fence has functions such as remote control, automatic inspection, and adaptation to environmental changes, and is widely used in industrial production, warehousing and logistics, military restricted areas, and other places. Its advantages lie in improving security efficiency, reducing labor costs, and preventing safety accidents. It is an indispensable part of the modern security system and is of great significance for building an intelligent and three-dimensional security protection network.

[0003] However, the traditional intelligent fences used in the current power plant maintenance operations have the following defects:

[0004] 1. Single function. Traditional intelligent fences can often only perceive abnormalities such as dumping and displacement in real time or only achieve personnel positioning, etc., and cannot dynamically display maintenance operation information, five Figure 1 signboards and other safety information, and cannot achieve road guidance;

[0005] 2. Low reliability of the power supply system. When a sudden power outage occurs, it is easy to cause the security protection to fail;

[0006] 3. Weak communication ability between devices, making it difficult to build a centralized management system. Summary of the Invention

[0007] The purpose of the present invention is to provide an LED intelligent digital security fence device and system to solve the above-mentioned problems.

[0008] The technical solution adopted by the present invention is as follows: An LED intelligent digital security fence device, the LED intelligent digital security fence device includes: a monitoring unit, a communication unit, a control unit, a display unit, a power supply unit, and an alarm unit;

[0009] The monitoring unit includes a six-axis gyroscope sensor and a Bluetooth module;

[0010] The communication unit includes a LoRa wireless communication module and a LoRa wireless gateway;

[0011] The display unit includes an LED liquid crystal display screen installed on the fence panel;

[0012] The power supply unit includes an external power interface and a lithium battery pack;

[0013] The six-axis gyroscope sensor and the Bluetooth module in the monitoring unit are connected to the main controller of the control unit through electrical lines, and the fence attitude data and the surrounding personnel identification information are transmitted in real time.

[0014] The LoRa wireless communication module of the communication unit is connected to the main controller, and is used to upload the processed data to the server through the LoRa wireless gateway, and at the same time receive remote configuration instructions.

[0015] The LED liquid crystal display screen of the display unit is connected to the main controller through the RS485 interface, and receives and displays the security information dynamically updated by the main controller.

[0016] The external power interface and the lithium battery pack of the power supply unit are connected to the power management chip of the control unit through a power switching circuit, and the power management chip uniformly distributes power to each module.

[0017] The LED indicator light, the buzzer and the voice broadcast module of the alarm unit are directly driven by the main controller, and activate the corresponding alarm signal when an abnormal state is detected.

[0018] In a preferred embodiment, the specific monitoring process of the monitoring unit includes:

[0019] Data acquisition: The six-axis gyroscope sensor (MPU6050) continuously acquires the original data of the three-axis acceleration (Ax, Ay, Az) and the three-axis angular velocity (Gx, Gy, Gz) at a sampling frequency of 100Hz, and transmits it to the main controller in real time through the I2C interface.

[0020] Attitude solution: The sensor-integrated digital motion processor (DMP) performs fusion calculations on the original data and outputs the Euler angle attitude data (pitch angle θ, roll angle φ, yaw angle ψ). The calculation formula is:

[0021]

[0022] Among them, θ and φ are the pitch angle (front and back tilt) and roll angle (left and right tilt) of the fence respectively, and the unit is degree (°).

[0023] Abnormality determination:

[0024] The main controller judges whether the attitude is abnormal according to the preset threshold (such as θ>10° or φ>10°). If it is detected that the attitude angle exceeds the threshold within 5 consecutive seconds, it is determined that the fence is tilted or shaken abnormally.

[0025] Bluetooth linkage scan:

[0026] After an anomaly is triggered, the main controller activates the Bluetooth module (BLE5.0) to scan for the MAC addresses or UUID identifiers of safety helmets and work uniforms within a radius of 50 meters at a frequency of once every 5 seconds, filtering out invalid devices and recording personnel location information.

[0027] Data reporting and alarm:

[0028] The anomaly data (attitude angle, timestamp) and personnel identification information are sent to the gateway via the LoRa module. Meanwhile, the main controller drives the LED indicator (flashing red), buzzer (beeping at 85 dB), and voice broadcast module ("Fence is tilted, stay away") of the alarm unit.

[0029] In a preferred embodiment, the six-axis gyroscope sensor uses the MPU6050 chip, integrating a three-axis accelerometer and a three-axis gyroscope, with measurement ranges of ±16g (acceleration) and ±2000° / s (angular velocity) respectively, a sampling frequency of 100Hz, and communicates with the main controller of the control unit via the I2C or SPI interface. Its operating voltage is 3.3V - 5V, with a built-in digital motion processor (DMP) that can output attitude angle data in real time, a detection accuracy error of less than ±2°, supports operation in a wide temperature environment from -40°C to 85°C, and has an IP65 protection level, suitable for complex outdoor working conditions.

[0030] In a preferred embodiment, the Bluetooth module is based on BLE5.0 technology and uses the Nordic nRF52840 chip, supports the 2.4GHz frequency band, has an adjustable transmit power from 0dBm to +8dBm, an effective scanning radius of up to 50 meters, and supports connecting 8 devices simultaneously. It has a built-in AES-128 encryption protocol, the scanning frequency can be configured to once every 5 seconds, interacts with the main controller via the UART interface, has a working current as low as 5μA (sleep mode) and 8mA (active mode), is compatible with the Bluetooth beacon (iBeacon) protocol, and can identify the MAC addresses or UUID identifiers of devices such as safety helmets and work uniforms.

[0031] In a preferred embodiment, the LoRa wireless communication module uses the Semtech SX1276 chip, with a working frequency band of 470MHz - 510MHz (compliant with Chinese radio standards), a transmit power of 20dBm, a receive sensitivity of -148dBm, a maximum air interface rate of 37.5kbps, and supports point-to-point and star networking. The module has a built-in FPGA anti-interference algorithm, a communication distance of not less than 2 kilometers (line-of-sight without obstruction), a power consumption of 12mA (transmission mode) and 5mA (reception mode), a sleep current as low as 1μA, is connected to the main controller via the SPI interface, and supports CAD (Channel Activity Detection) technology to optimize energy consumption.

[0032] In a preferred embodiment, the LoRa wireless gateway is equipped with a dual-channel SX1301 baseband chip, supports 8-channel parallel reception, has a maximum access node count of 1000, the backhaul link uses dual-band Wi-Fi (2.4GHz / 5GHz) or gigabit Ethernet, and the data throughput reaches 50Mbps. It has a built-in 4G full-network module as a redundant link, is equipped with a 6dBi high-gain omnidirectional antenna, has an operating temperature of -30°C to 70°C, an IP67 protection level, a built-in Linux system, supports the MQTT / HTTP protocol, can forward data to a cloud server, and has a local caching function (storage capacity 32GB).

[0033] In a preferred embodiment, the LED liquid crystal display is a 55-inch outdoor high-brightness screen, with a resolution of 1920×1080, a peak brightness of 5000cd / m 2 , a refresh rate of 120Hz, uses RGB tri-color surface-mounted lamp beads, and the pixel pitch is ≤2.5mm. The screen is connected to the control unit through an RS485 interface, supports H.265 video decoding, has an operating voltage of DC24V±10%, and a power consumption of ≤300W / m 2 , an IP68 protection level, with a 6mm tempered glass covering the surface, and can stably display graphic, video, and dynamic guidance information in an environment of -20°C to 60°C.

[0034] In a preferred embodiment, the external power supply interface uses an IP67 waterproof aviation plug, with an input voltage of AC220V±15%, a built-in overvoltage, overcurrent, and reverse connection protection circuit, and a maximum load current of 10A;

[0035] The lithium battery pack is of the lithium iron phosphate system, with a nominal voltage of 12V, a capacity of 20Ah, supports 2C fast charging (0% to 100% charging time ≤ 3 hours), a cycle life of ≥2000 times, is equipped with a BMS management system, has temperature protection (-20°C to 60°C), short-circuit protection, and balanced charge and discharge functions, can achieve seamless switching through a power switching circuit, and has a backup battery life of ≥48 hours (full-load condition).

[0036] In a preferred embodiment, an LED intelligent digital security fence system, the system includes: a plurality of intelligent digital security fence devices as described in any one of claims 1 to 8, a LoRa gateway, and a server; the LoRa gateway is used to centrally receive and forward the data of the fence devices; the server is used for data storage, processing, and management.

[0037] In a preferred embodiment, the system supports remote configuration and management of the fence devices through the server;

[0038] The system has a hierarchical alarm function and can trigger different levels of alarms according to the severity of the abnormal state.

[0039] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0040] 1. In the present invention, through the design of multi-sensor fusion and intelligent communication architecture, the monitoring efficiency and management level of the safety fence are significantly improved. The six-axis gyroscope sensor captures the physical posture changes of the fence in real time, and combines with the Bluetooth module to scan the unique identifier of the safety equipment of the surrounding personnel, realizing the dual perception of abnormal fence status and personnel dynamics; the programmable LED liquid crystal display dynamically displays maintenance operation information, safety signs and road guidance, breaking through the limitation of the traditional fence that can only give a single alarm or static display, forming a closed-loop management of "monitoring - warning - guiding", effectively preventing potential safety hazards and improving the coordination efficiency of on-site operations.

[0041] 2. In the present invention, a power supply scheme of seamless switching between external power supply and lithium battery pack is adopted, combined with a hierarchical communication mode of LoRa self-organizing network and Wi-Fi backhaul, ensuring stable operation even in extreme power outages or complex environments. The LoRa module supports long-distance and low-power transmission, constructs an efficient interconnection communication network between devices, and cooperates with the centralized data processing on the server side to realize remote configuration, multi-level alarm and event traceability of the fence device, completely solving the problems of fragile power supply and communication island in the traditional scheme, and providing all-weather and highly reliable safety protection and intelligent management support for scenarios such as construction sites. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is the organizational structure diagram of the present invention.

[0043] Figure 2 is the system architecture of the present invention.

[0044] Figure 3 is the power management flow chart of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0046] Refer to Figures 1 - 3 ,

[0047] An LED intelligent digital safety fence device: The LED intelligent digital safety fence device includes: a monitoring unit, a communication unit, a control unit, a display unit, a power supply unit and an alarm unit;

[0048] The monitoring unit includes a six-axis gyroscope sensor and a Bluetooth module; the six-axis gyroscope sensor of the monitoring unit is used to monitor the shaking and tilting states of the fence in real time, and triggers an alarm when an anomaly is detected;

[0049] The communication unit includes a LoRa wireless communication module and a LoRa wireless gateway;

[0050] The display unit includes an LED liquid crystal display screen installed on the fence panel;

[0051] The power supply unit includes an external power interface and a lithium battery pack;

[0052] The six-axis gyroscope sensor and the Bluetooth module in the monitoring unit are connected to the main controller of the control unit through electrical lines, and transmit the fence attitude data and the surrounding personnel identification information in real time;

[0053] The LoRa wireless communication module of the communication unit is connected to the main controller, and is used to upload the processed data to the server through the LoRa wireless gateway, and at the same time receive remote configuration instructions; 7. The communication unit automatically enters the deep sleep state when there is no data transmission requirement to reduce power consumption.

[0054] The LED liquid crystal display screen of the display unit is connected to the main controller through the RS485 interface, and receives and displays the security information dynamically updated by the main controller; the LED liquid crystal display screen of the display unit is used to display maintenance operation information, five Figure 1 signs and road guidance and other information.

[0055] The external power interface and the lithium battery pack of the power supply unit are connected to the power management chip of the control unit through a power switching circuit, and the power management chip uniformly distributes power to each module;

[0056] The LED indicator light, buzzer and voice broadcast module of the alarm unit are directly driven by the main controller, and activate the corresponding alarm signal when an abnormal state is detected.

[0057] The specific monitoring process of the monitoring unit includes:

[0058] Data acquisition: The six-axis gyroscope sensor (MPU6050) continuously acquires the original data of the three-axis acceleration (Ax, Ay, Az) and the three-axis angular velocity (Gx, Gy, Gz) at a sampling frequency of 100 Hz, and transmits it to the main controller in real time through the I2C interface.

[0059] Attitude calculation: The sensor built-in digital motion processor (DMP) performs fusion calculation on the original data and outputs the Euler angle attitude data (pitch angle θ, roll angle φ, yaw angle ψ), and the calculation formula is:

[0060]

[0061] Wherein, θ and φ are respectively the pitch angle (front - back tilt) and roll angle (left - right tilt) of the fence, with the unit of degree (°).

[0062] Abnormality determination:

[0063] The main controller determines whether the attitude is abnormal according to a preset threshold (such as θ > 10° or φ > 10°). If it is detected that the attitude angle exceeds the threshold within 5 consecutive seconds, it is determined that the fence is tilted or shaken abnormally.

[0064] Bluetooth linkage scanning:

[0065] After an abnormality is triggered, the main controller activates the Bluetooth module (BLE5.0) to scan the MAC addresses or UUID identifiers of safety helmets and work uniforms within a radius of 50 meters at a frequency of 5 seconds per time, filters out invalid devices and records personnel positioning information. The Bluetooth module adopts BLE5.0 technology and is used to scan and record the unique identifier information of surrounding personnel's safety helmets and work clothes.

[0066] Data reporting and alarm:

[0067] Abnormal data (attitude angle, timestamp) and personnel identification information are sent to the gateway through the LoRa module. At the same time, the main controller drives the LED indicator (red flashing), buzzer (85dB beeping) of the alarm unit and the voice broadcast module ("The fence is tilted, please stay away").

[0068] The six - axis gyroscope sensor uses the MPU6050 chip, which integrates a three - axis accelerometer and a three - axis gyroscope. The measurement ranges are ±16g (acceleration) and ±2000° / s (angular velocity) respectively, the sampling frequency is 100Hz, and it communicates with the main controller of the control unit through the I2C or SPI interface. Its working voltage is 3.3V - 5V, and it has a built - in digital motion processor (DMP), which can output attitude angle data in real - time. The detection accuracy error is less than ±2°, supports operation in a wide temperature environment from - 40°C to 85°C, and the protection level reaches IP65, adapting to complex outdoor working conditions.

[0069] The Bluetooth module is based on BLE5.0 technology and uses the Nordic nRF52840 chip. It supports the 2.4GHz frequency band, the transmit power is adjustable from 0dBm to +8dBm, the effective scanning radius reaches 50 meters, and it supports connecting 8 devices simultaneously. It has a built - in AES - 128 encryption protocol, the scanning frequency can be configured as once every 5 seconds, interacts with the main controller through the UART interface, the working current is as low as 5μA (sleep mode) and 8mA (active mode), is compatible with the Bluetooth beacon (iBeacon) protocol, and can identify the MAC addresses or UUID identifiers of devices such as safety helmets and work clothes.

[0070] The LoRa wireless communication module uses the Semtech SX1276 chip, with a working frequency band of 470MHz - 510MHz (compliant with Chinese radio standards), a transmit power of 20dBm, a receive sensitivity of -148dBm, a maximum air interface rate of 37.5kbps, and supports point-to-point and star networking. The module is built-in with an FPGA anti-interference algorithm, the communication distance is not less than 2 kilometers (line-of-sight without obstruction), the power consumption is 12mA (transmission mode) and 5mA (reception mode), the sleep current is as low as 1μA, and it is connected to the main controller through the SPI interface, supporting CAD (Channel Activity Detection) technology to optimize energy consumption.

[0071] The LoRa wireless gateway is equipped with a dual-channel SX1301 baseband chip, supports 8-channel parallel reception, the maximum number of access nodes is 1000, the backhaul link uses dual-band Wi-Fi (2.4GHz / 5GHz) or Gigabit Ethernet, and the data throughput reaches 50Mbps. It is built-in with a 4G full-network communication module as a redundant link, equipped with a 6dBi high-gain omnidirectional antenna, the operating temperature is -30°C to 70°C, the protection level is IP67, built-in with a Linux system, supports the MQTT / HTTP protocol, can forward data to the cloud server, and has a local cache function (storage capacity 32GB).

[0072] The LED liquid crystal display is a 55-inch outdoor high-brightness screen, with a resolution of 1920×1080, a peak brightness of 5000cd / m 2 ², a refresh rate of 120Hz, uses RGB tri-color surface-mounted lamp beads, and the pixel pitch is ≤2.5mm. The screen is connected to the control unit through the RS485 interface, supports H.265 video decoding, the working voltage is DC24V±10%, and the power consumption is ≤300W / m 2 ², the protection level is IP68, the surface is covered with 6mm tempered glass, and it can stably display text, images, videos and dynamic guidance information in the environment of -20°C to 60°C.

[0073] The external power interface uses an IP67 waterproof aviation plug, the input voltage is AC220V±15%, built-in with overvoltage, overcurrent and reverse connection protection circuits, and the maximum load current is 10A; the power supply unit has an automatic switching function. When external power failure is detected, it automatically switches to lithium battery power supply and triggers an alarm.

[0074] The lithium battery pack is of lithium iron phosphate system, with a nominal voltage of 12V and a capacity of 20Ah, supports 2C fast charging (0% - 100% charging time ≤ 3 hours), the cycle life is ≥2000 times, equipped with a BMS management system, with temperature protection (-20°C to 60°C), short-circuit protection and balanced charge and discharge functions, and can achieve seamless switching through the power supply switching circuit, and the backup battery life is ≥48 hours (full load condition).

[0075] An LED intelligent digital safety fence system, the system comprising: a plurality of intelligent digital safety fence devices as recited in any one of claims 1 to 8, a LoRa gateway, and a server; the LoRa gateway is used for centrally receiving and forwarding the data of the fence devices; the server is used for data storage, processing, and management;

[0076] The system supports remote configuration and management of the fence devices through the server; the system has a hierarchical alarm function and can trigger different levels of alarms according to the severity of the abnormal state.

[0077] It can be seen from the above that: in the present invention, through multi-sensor fusion and intelligent communication architecture design, the monitoring efficiency and management level of the safety fence are significantly improved. The six-axis gyroscope sensor captures the physical attitude changes of the fence in real time, and combines with the Bluetooth module to scan the unique identifier of the safety equipment of the surrounding personnel, realizing the dual perception of the abnormal fence state and personnel dynamics; the programmable LED liquid crystal display dynamically displays maintenance operation information, safety signs, and road guidance, breaking through the limitation that the traditional fence can only give a single alarm or static display, forming a closed-loop management of "monitoring - warning - guiding", effectively preventing potential safety hazards and improving the coordination efficiency of on-site operations. In the present invention, a power supply scheme of seamless switching between an external power supply and a lithium battery pack is adopted, combined with a hierarchical communication mode of LoRa self-networking and Wi-Fi backhaul, ensuring stable operation even in extreme power outages or complex environments. The LoRa module supports long-distance and low-power transmission, constructs an efficient interconnected communication network between devices, and cooperates with the centralized data processing on the server side to realize remote configuration, multi-level alarm, and event traceability of the fence devices, completely solving the problems of vulnerable power supply and communication islands in the traditional solution, and providing all-weather and highly reliable safety protection and intelligent management support for scenarios such as construction sites.

[0078] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article, or device comprising the element.

[0079] The foregoing description enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An LED intelligent digital safety fence device is characterized by: The LED intelligent digital safety fence device includes: a monitoring unit, a communication unit, a control unit, a display unit, a power supply unit and an alarm unit; The monitoring unit includes a six-axis gyroscope sensor and a Bluetooth module; The communication unit includes a LoRa wireless communication module and a LoRa wireless gateway; The display unit includes an LED liquid crystal display screen installed on the fence board; The power supply unit includes an external power interface and a lithium battery pack; The six-axis gyro sensor and Bluetooth module in the monitoring unit are connected to the main controller of the control unit through electrical lines to transmit fence posture data and surrounding personnel identification information in real time; The LoRa wireless communication module of the communication unit is connected to the main controller, and is used to upload the processed data to the server through the LoRa wireless gateway and receive remote configuration instructions at the same time; The LED liquid crystal display screen of the display unit is connected to the main controller via an RS485 interface to receive and display the security information dynamically updated by the main controller; The external power interface and the lithium battery pack of the power supply unit are connected to the power management chip of the control unit through a power switching circuit, and the power management chip uniformly distributes power to each module; The LED indicator light, buzzer and voice broadcast module of the alarm unit are directly driven by the main controller, and activate the corresponding alarm signal when an abnormal state is detected.

2. The LED intelligent digital safety fence device according to claim 1 is characterized in that: The specific monitoring process of the monitoring unit includes: Data acquisition: The six-axis gyroscope sensor MPU6050 continuously collects the raw data of three-axis acceleration: Ax, Ay, Az: and three-axis angular velocity: Gx, Gy, Gz at a sampling frequency of 100Hz, and transmits it to the main controller in real time through the I2C interface; Attitude calculation: The sensor’s built-in digital motion processor performs fusion calculation on the raw data and outputs Euler angle attitude data: pitch angle θ, roll angle φ, yaw angle ψ. The calculation formula is: Where θ and φ are the pitch and roll angles of the fence, respectively, in degrees; Abnormal determination: The main controller determines whether the posture is abnormal based on the preset threshold. If it detects that the posture angle exceeds the threshold for 5 consecutive seconds, it is determined that the fence is tilted or shaking abnormally. Bluetooth linkage scanning: After an abnormality is triggered, the main controller starts the Bluetooth module and scans the MAC addresses or UUID identifiers of safety helmets and work clothes within a radius of 50 meters at a frequency of 5 seconds per time, filters invalid devices and records personnel location information; Data reporting and alarm: Abnormal data and personnel identification information are sent to the gateway through the LoRa module, and the main controller drives the LED indicator, buzzer and voice broadcast module of the alarm unit.

3. The LED intelligent digital safety fence device according to claim 1 is characterized in that: The six-axis gyroscope sensor adopts the MPU6050 chip, integrates a three-axis accelerometer and a three-axis gyroscope, has a measuring range of ±16g and ±2000° / s respectively, a sampling frequency of 100Hz, and communicates with the main controller of the control unit through an I2C or SPI interface; its operating voltage is 3.3V-5V, and it has a built-in digital motion processor, which outputs attitude angle data in real time, with a detection accuracy error of less than ±2°, supports operation in a wide temperature environment of -40°C to 85°C, and has a protection level of IP65, which can adapt to complex outdoor working conditions.

4. The LED intelligent digital safety fence device according to claim 1 is characterized in that: The Bluetooth module is based on BLE5.0 technology, adopts Nordic nRF52840 chip, supports 2.4GHz frequency band, has adjustable transmission power from 0dBm to +8dBm, an effective scanning radius of 50 meters, and supports simultaneous connection of 8 devices; built-in AES-128 encryption protocol, a scanning frequency of once every 5 seconds, interacts with the main controller through the UART interface, the operating current is as low as 5μA and 8mA, is compatible with the Bluetooth beacon protocol, and can identify the MAC address or UUID identifier of safety helmets and work clothes equipment.

5. The LED intelligent digital safety fence device according to claim 1 is characterized in that: The LoRa wireless communication module adopts Semtech SX1276 chip, with an operating frequency band of 470MHz-510MHz, a transmission power of 20dBm, a receiving sensitivity of -148dBm, a maximum air interface rate of 37.5kbps, and supports point-to-point and star networking; the module has a built-in FPGA anti-interference algorithm, a communication distance of not less than 2 kilometers, a power consumption of 12mA and 5mA, a sleep current as low as 1μA, and is connected to the main controller through an SPI interface, supporting CAD technology to optimize energy consumption.

6. The LED intelligent digital safety fence device according to claim 1 is characterized in that: The LoRa wireless gateway is equipped with a dual-channel SX1301 baseband chip, supports 8-channel parallel reception, has a maximum number of access nodes of 1,000, and uses dual-band Wi-Fi or Gigabit Ethernet for the backhaul link, with a data throughput of 50Mbps. It has a built-in 4G full network access module as a redundant link, equipped with a 6dBi high-gain omnidirectional antenna, an operating temperature of -30℃ to 70℃, a protection level of IP67, a built-in Linux system, supports MQTT / HTTP protocols, forwards data to the cloud server, and has a local cache function.

7. The LED intelligent digital safety fence device according to claim 1 is characterized in that: The LED LCD display is a 55-inch outdoor high-brightness screen with a resolution of 1920×1080 and a peak brightness of 5000cd / m 2 , refresh rate 120Hz, using RGB three-in-one surface-mount lamp beads, pixel pitch ≤2.5mm; the screen is connected to the control unit through the RS485 interface, supports H.265 video decoding, working voltage DC24V±10%, power consumption ≤300W / m 2 , protection level IP68, surface covered with 6mm tempered glass, and can stably display graphics, videos and dynamic guidance information in an environment of -20℃ to 60℃.

8. The LED intelligent digital safety fence device according to claim 1 is characterized in that: The external power interface adopts IP67 waterproof aviation plug, input voltage AC220V±15%, built-in overvoltage, overcurrent and reverse connection protection circuit, maximum carrying current 10A; The lithium battery pack is a lithium iron phosphate system with a nominal voltage of 12V, a capacity of 20Ah, supports 2C fast charging, a cycle life of ≥2000 times, is equipped with a BMS management system, has temperature protection, short circuit protection and balanced charging and discharging functions, and achieves seamless switching through the power switching circuit. The standby battery life is ≥48 hours.

9. An LED intelligent digital safety fence system, characterized by: The system comprises: a plurality of intelligent digital safety fence devices as described in any one of claims 1 to 8, a LoRa gateway and a server; the LoRa gateway is used for centrally receiving and forwarding data from the fence devices; and the server is used for data storage, processing and management.

10. The LED intelligent digital safety fence system according to claim 9, characterized in that: The system supports remote configuration and management of fence devices through a server; The system has a graded alarm function, which triggers alarms of different levels according to the severity of the abnormal state.

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