Anti-interference pledge electronic identification board

Abstract

The utility model discloses an anti -interference's pledge electronic signboard, including the sealed cavity of front shell and rear shell constitution, is equipped with printed circuit board in the cavity. The double -frequency radio frequency identification unit is provided on the circuit board, and with integrated radio frequency antenna component electric connection, and the antenna is separated through the composite isolation layer between the front shell, to promote the anti -interference performance. The conductive grid is arranged between the circuit board and the rear shell, the conductive grid is communicated with the anti -disassembly detection terminal, and the through fastener and its form electric contact, are used for detecting the disassembly behavior. The circuit board is equipped with alarm circuit and physical fuse, can trigger irreversible storage when detecting abnormality. The signboard can be fixed in the pledge through the anti -disassembly bolt, structural glue pad or welding, supports the battery power supply or passive inductive power supply. The utility model has anti -interference, only identity identification, anti -disassembly tamper -proof and permanent storage function, is applicable to the monitoring and inspection of financial pledge, promotes the supervision efficiency and security.

Description

Technical Field

[0001] This utility model relates to the field of electronic information technology, specifically to an anti-interference electronic identification tag for pledged items. Background Technology

[0002] In the financial sector, collateral serves as crucial security for credit funds and is widely used in various business models, including commodity warehousing, equipment mortgages, and vehicle pledges. Financial institutions and regulatory authorities typically require ongoing monitoring of collateral to ensure its authenticity, integrity, and non-unauthorized transferability. Current methods for monitoring collateral primarily include manual inspections, video surveillance, and identification methods based on barcodes or radio frequency identification (RFID).

[0003] Manual inspection relies on personnel to check and record each pledged item one by one, which is not only inefficient and time-consuming, but also prone to omissions and tampering due to human error. In large-scale pledged storage scenarios, manual inspection cannot cover all pledged items, lacks real-time capability, and cannot meet the needs of high-frequency inspections.

[0004] While video surveillance can provide real-time images, it has blind spots and cannot guarantee comprehensive coverage when the amount of collateral is large, the warehouse environment is complex, or the collateral is stacked. Furthermore, video surveillance can only provide macroscopic visual evidence and lacks unique authentication of individual collateral items, thus failing to effectively prevent collateral from being switched or replaced.

[0005] While barcode or ordinary RFID identification methods have improved the efficiency of inventory and verification to some extent, they still have many shortcomings. Barcodes are easily damaged or copied, and their anti-counterfeiting capabilities are weak; ordinary RFID tags are mostly one-time affixing or hanging methods, lacking effective anti-tampering mechanisms, and are easily removed or replaced maliciously. Once the tag is no longer bound to the pledged goods, the supervision chain breaks. In addition, the communication performance of existing ordinary RFID tags deteriorates significantly in metallic environments, and they are susceptible to electromagnetic interference, leading to unstable readings or even complete failure. This is a technical problem that urgently needs to be solved for applications where the pledged goods are mostly metal commodities.

[0006] Furthermore, existing electronic tags generally lack reliable tamper detection and permanent evidence storage capabilities. In the event of the collateral being dismantled or damaged, existing tags often only provide limited alarm signals and cannot create irreversible records within the tag itself. This makes it difficult for subsequent regulators to trace the time of the tampering and assign responsibility.

[0007] In summary, existing electronic identification technology for pledged assets has significant shortcomings in terms of anti-interference capabilities, anti-tampering and anti-falsification capabilities, permanent evidence storage capabilities, and adaptability to complex environments. A new technical solution is urgently needed to address these issues. Summary of the Invention

[0008] To solve the above-mentioned technical problems, this utility model provides an anti-interference electronic identification tag for pledged items.

[0009] This utility model is achieved through the following technical solution: This utility model provides an anti-interference electronic identification tag for pledged items, comprising: A front shell and a rear shell that can be detached from and closed to form an internal cavity, wherein the front shell and the rear shell are locked together by at least two through fasteners and form an annular sealing groove around their periphery; The aforementioned internal cavity contains a printed circuit board fixed to the rear shell, on which a main control chip, non-volatile memory, and at least two tamper-proof detection terminals are arranged. The aforementioned printed circuit board is equipped with a dual-frequency radio frequency identification unit, which includes an ultra-high frequency radio frequency chip and a high frequency radio frequency chip. The aforementioned dual-frequency radio frequency identification unit is electrically connected to an integrated radio frequency antenna assembly, which is located inside the front housing and maintains a predetermined distance from the front housing. A composite isolation layer is provided between the printed circuit board and the front shell. It is located between the integrated radio frequency antenna assembly and the printed circuit board and is fixed to the inner wall of the rear shell by adhesive bonding. A conductive mesh is provided between the printed circuit board and the back cover, which is a conductive line array printed on a flexible substrate; at least two lead-out pads of the conductive mesh are electrically connected to the tamper detection terminals of the printed circuit board. The aforementioned through fastener is an anti-disassembly bolt or rivet. The aforementioned through fastener passes through the aforementioned front shell and through the aforementioned rear shell, and forms electrical contact with at least one pad of the conductive mesh. An alarm circuit is provided on the aforementioned printed circuit board, and one input terminal of the alarm circuit is electrically connected to a conductive grid; the alarm circuit includes a physical fuse.

[0010] The core of this structure lies in its multiple combinations of mechanical housing, radio frequency unit, tamper detection, and alarm circuitry, enabling reliable electronic identification and protection of financial collateral. The front and rear shells form a cavity, ensuring the complete encapsulation of the internal electronic modules and preventing the ingress of external dust, moisture, or electromagnetic interference, thereby enhancing system stability.

[0011] The combination of the main control chip and non-volatile memory not only enables the access to radio frequency data but also provides long-term data retention capabilities, ensuring that the identity information, historical records, and alarm status of the pledged assets are not lost due to power failure. Non-volatile memory commonly uses EEPROM or Flash memory structures, and its OTP area enables one-time write operations, meeting the tamper-proof requirements in financial applications.

[0012] The dual-frequency RFID unit design reflects compatibility in different read / write environments. The high-frequency chip typically operates at 13.56MHz, suitable for short-range read / write and security authentication; the ultra-high-frequency chip operates at 860-960MHz, providing long-range identification and rapid inventory counting capabilities. The combination of the two can cover the diverse needs of inspection and warehouse management scenarios.

[0013] The integrated RF antenna assembly is mounted at predetermined intervals on the inside of the front housing, a layout that avoids excessive signal attenuation by the metal casing. A composite isolation layer further suppresses electromagnetic coupling interference, and the radiation efficiency and directivity of the RF antenna are optimized through a stacked structure of ferrite sheets and dielectrics.

[0014] The conductive mesh, a crucial component of the tamper detection system, consists of a uniformly arranged array of conductive lines covering the space between the circuit board and the back cover. If someone attempts to damage, disassemble, or cut the cover, the conductive mesh will break, sending a signal to the main control circuit via the tamper detection terminals, triggering the alarm circuit. The physical fuse in the alarm circuit will melt and record permanent information upon the event, ensuring that any unauthorized operation leaves irreversible electronic evidence.

[0015] This structure achieves a closed-loop security mechanism of "physical protection - detection triggering - irreversible recording", which is particularly suitable for the full life cycle management of financial collateral.

[0016] Furthermore, the mating surfaces of the front and rear shells are coated with epoxy potting compound; the front shell is made of 304 stainless steel or 316 stainless steel; the rear shell is made of engineering plastic or aluminum alloy; and an elastic sealing element is embedded in the annular sealing groove, which is pressed tight when the front and rear shells are locked together.

[0017] The application of epoxy potting compound not only provides a seal but also enhances the impermeability of the shell's mating surfaces, preventing external moisture and acidic or alkaline substances from penetrating the interior. The high hardness of the cured compound further increases the difficulty of disassembly.

[0018] The front shell is made of 304 or 316 stainless steel, metals with excellent corrosion resistance and mechanical strength. 316 stainless steel incorporates molybdenum, making it particularly suitable for long-term stability in chlorine-containing environments. The rear shell, depending on cost and weight requirements, can be made of engineering plastics (such as PC or PBT) or aluminum alloy. Engineering plastics offer good formability and electrical insulation, while aluminum alloy provides additional mechanical protection while maintaining lightweight properties.

[0019] The annular sealing groove design ensures uniform stress on the seal. When the front and rear shells are locked together, the elastic seal undergoes continuous compression deformation, ensuring long-term stable sealing. This structure effectively improves the overall protection level, achieving IP65 or even higher protection standards.

[0020] Furthermore, the aforementioned through-fastener includes a screw, an irreversible nut component, and a conductive sleeve. The conductive sleeve forms a press-fit contact with the pads of the conductive mesh, and the irreversible nut component undergoes plastic deformation during disassembly to form irreversible mechanical marks.

[0021] The threaded connection of the screw not only provides a basic mechanical connection but also serves as part of an electrical pathway, achieving electrical contact with the conductive mesh through a conductive sleeve. This means that the condition of the fastener directly affects the tamper detection; once it becomes loose or disconnected, the circuit will immediately trigger an alarm.

[0022] The design concept of irreversible nuts is to ensure that any unauthorized disassembly is irreversible. Their plastic deformation is typically achieved through specially designed metal materials or fracture grooves, leaving obvious signs of damage after disassembly, allowing the management of the pledged assets to visually identify tampering. This "physically irreversible" structure complements the electronic alarm mechanism, enhancing the overall system's protection level.

[0023] The conductive sleeve provides stable electrical contact during crimping. Its structure must ensure reliability during long-term use while also possessing a degree of flexibility to adapt to changes in ambient temperature and slight deformation of the housing. This sleeve is made of nickel-plated or gold-plated copper alloy to reduce contact resistance and improve corrosion resistance.

[0024] Furthermore, the aforementioned sign is fixed to the pledged object body by means of the aforementioned anti-tamper bolts or rivets, or is fixed to the surface of the pledged object by means of structural adhesive pads, or is fixed to the pledged object body by means of spot welding, and at least one weld point is electrically connected to the aforementioned conductive mesh.

[0025] The diverse fixing methods allow the sign to adapt to different types of collateral. For flat and sufficiently strong metal collateral, anti-tamper bolts or rivets can be used for through-hole fixing, which offers high strength and stability. For materials that are not suitable for perforation, such as certain plastic housings or surface-treated equipment, structural adhesive pads can be used for bonding to ensure a secure installation.

[0026] Spot welding is suitable for metallic collateral, especially in situations requiring long-term fixation and resistance to disassembly. The electrical connection between the weld and the conductive mesh not only provides stronger mechanical fixation but also makes the weld part of the tamper detection system. If someone attempts to grind or cut the weld, the conductive circuit is disrupted, immediately triggering an alarm circuit.

[0027] This approach, combining fixed structures with electrical testing, creates a "test upon installation" safety feature. Compared to traditional installation methods that rely solely on mechanical strength, this method further enhances the difficulty of tampering and traceability, making the signage more suitable for use in the supervision and inspection of financial assets.

[0028] Furthermore, the aforementioned printed circuit board is powered by a power module, which includes at least one of the following structures: A button or thin-film lithium battery compartment is embedded in the cavity, and the button or thin-film lithium battery compartment is electrically connected to the printed circuit board via a battery contact spring. Alternatively, when the aforementioned printed circuit board is not equipped with a battery compartment, it can achieve passive inductive power supply solely through energy transfer from the UHF chip.

[0029] The power supply design incorporates both active and passive modes. When using button or thin-film lithium batteries, the system can actively perform data maintenance, alarm logging, and encryption operations without external reader energy stimulation. This battery compartment design typically employs a replaceable or semi-permanent encapsulation method, ensuring a good electrical connection through battery contact springs. These springs are mostly made of gold-plated phosphor bronze, which is both conductive and fatigue-resistant.

[0030] In battery-free mode, the signage relies on the energy transfer from the UHF radio frequency chip for passive power. This passive sensing mode can obtain energy from the radio frequency field emitted by the reader for short-term data reading and writing and basic function operation. Although the power supply capacity is limited, its advantage lies in being maintenance-free, ensuring continuous operation of the signage over an extremely long lifespan, and eliminating reliability issues caused by battery aging.

[0031] With its dual-mode power supply design, this signage can flexibly adapt to different financial scenarios. For example, for collateral requiring long-term fixed supervision, a battery-powered solution can be used to enhance alarm capabilities; while for collateral with high liquidity or stored in complex environments, a passive solution can be used to reduce maintenance costs.

[0032] Furthermore, the aforementioned integrated radio frequency antenna assembly is formed from a flexible printed circuit board, on which an ultra-high frequency antenna is formed in a zigzag pattern and a closed loop high frequency coil is formed on the same or another layer; an air gap of 2 to 5 mm is maintained between the aforementioned integrated radio frequency antenna assembly and the aforementioned front shell.

[0033] The use of flexible printed circuit boards (FPCs) enables complex wiring layouts for antenna components within limited space. The UHF antenna employs a zigzag arrangement, achieving a longer effective electrical length over a shorter substrate, thus optimizing the antenna's resonant characteristics. The high-frequency coil utilizes a closed-loop design, ensuring efficient inductive coupling at 13.56MHz. Both antenna types are implemented on the same substrate, reducing size and improving structural reliability.

[0034] Maintaining an air gap between the front housing and the antenna is crucial. If the antenna is too close to the metal housing, it can cause severe signal attenuation or even failure. By maintaining a gap of 2–5 mm, the electromagnetic field can be effectively distributed while avoiding eddy current losses in the metal material. This gap can be achieved using support pillars or spacers, ensuring stability during long-term use.

[0035] This design ensures that the signage maintains good communication performance in both near-field and far-field environments. The UHF antenna is suitable for long-distance inventory checks, while the HF coil can be used for encryption verification and anti-counterfeiting detection. Together, they meet the dual requirements of security and efficiency for financial collateral.

[0036] Furthermore, the aforementioned composite isolation layer is a stacked structure, comprising a ferrite sheet and a dielectric pad layer; the ferrite sheet is located on the side closer to the integrated radio frequency antenna assembly, the dielectric pad layer is located on the side closer to the printed circuit board, and the thickness of the ferrite sheet is 0.8–1.5 mm.

[0037] The composite isolation layer is crucial for improving antenna performance and reducing interference. Ferrite sheets, a magnetic material, suppress the metal shielding effect while enhancing the directivity of radio frequency signals, preventing signal loss caused by the metal material of the front shell. The thickness of the ferrite sheet is limited to between 0.8 and 1.5 mm, a range determined by considering both shielding effectiveness and overall size. Too thin a layer reduces isolation, while too thick a layer increases weight and cost.

[0038] The primary function of the dielectric layer is to provide electrical insulation and improve electromagnetic field distribution. By adding a dielectric layer between the ferrite sheet and the printed circuit board, coupling interference can be reduced, and the operating frequency of the antenna can be stabilized. This stacked structure achieves a dual effect of "magnetic isolation + dielectric conditioning," significantly improving the efficiency of radio frequency communication.

[0039] This optimization of the composite isolation layer not only improves the stability of signage identification in complex environments, but also enhances its resistance to external electromagnetic interference, providing a guarantee for the long-term reliable monitoring of financial collateral.

[0040] Furthermore, the conductive mesh is formed by copper or silver paste printed lines, the line width of which is 0.2 to 1.0 mm and the mesh spacing is 5 to 15 mm; the metallized pads of the conductive mesh are electrically connected to the tamper detection terminals on the printed circuit board through crimping posts or solder joints.

[0041] The conductive mesh uses copper or silver paste for printing lines to ensure conductivity while maintaining a certain degree of flexibility and adhesion. These pastes are typically prepared on a flexible substrate using a screen printing process, forming a continuous conductive path after curing. The line width ranges from 0.2 to 1.0 mm, ensuring sufficient coverage while avoiding the breakage risk of excessively thin lines and the insufficient flexibility of excessively wide lines.

[0042] The grid spacing is set between 5 and 15 mm, which is a balance between tamper detection sensitivity and material cost. Once the casing is mechanically damaged, at least one conductive circuit will be severed, thus ensuring the reliability of alarm triggering.

[0043] The electrical connection between the metallized pads and the tamper detection terminals can be achieved through crimping posts or solder joints. Crimping avoids damage to the flexible substrate caused by high-temperature soldering, while solder joints provide a stronger electrical bond. Either method ensures a stable electrical connection between the conductive mesh and the circuit board. Thus, the conductive mesh not only serves as the core of the tamper detection system but also enhances electromagnetic shielding capabilities to a certain extent.

[0044] Furthermore, the alarm circuit includes a continuity detector, a logic latch, and a physical fuse. The physical fuse is disposed in a fuse holder on the printed circuit board and connected to the OTP area of ​​the non-volatile memory, and is used to trigger a one-time write when a disassembly is detected.

[0045] The core of the alarm circuit is the real-time detection of the continuity of the conductive grid. The continuity detector can determine whether the line is interrupted by changes in resistance or capacitance. Once an abnormal signal is detected, it will trigger a logic latch. The function of the logic latch is to retain the instantaneous detection result, and even if the external state returns to normal, it can record the disassembly behavior to prevent "flashover escape".

[0046] The physical fuse acts as a one-time trigger device. It is connected to the OTP (Over-the-Place) area of ​​the non-volatile memory and burns out upon triggering, thereby changing the state of the OTP area. Since the OTP area can only be written to once, this mechanism ensures that tampering is permanently recorded and cannot be erased by subsequent recovery operations. After the fuse is triggered, the system can read the relevant status during inspection using the RFID unit to quickly determine whether the pledged item has been illegally tampered with.

[0047] This "electronic detection + physical latch" design ensures that alarm information is irreversible, meeting the financial sector's requirements for the permanence and traceability of tampered records.

[0048] Furthermore, the outer surface of the aforementioned front shell is provided with a visual positioning mark surface, which is formed by laser etching or ceramic ink printing; the area of ​​the aforementioned visual positioning mark surface is not less than 40mm × 40mm.

[0049] The visual positioning signage is designed to assist both manual inspection and machine identification. With an area of ​​at least 40mm x 40mm, it ensures sufficient visibility, facilitating quick location of the signage in complex stacking environments. This surface can be formed using laser etching, offering advantages such as permanence, fade resistance, and abrasion resistance; or it can be printed with ceramic ink, capable of withstanding high temperatures and chemical corrosion.

[0050] Visual positioning markers can include not only QR codes, barcodes, or specific graphics, but also serve as a reference surface for automatic camera recognition and alignment. In applications of automated equipment such as inspection robots or drones, these markers can significantly improve inspection efficiency.

[0051] By combining radio frequency identification (RFID) and visual recognition, the signage not only provides information interaction at the electronic level but also facilitates the location and identification of personnel and equipment at the physical level. This design makes the collateral supervision system more complete and further enhances security and reliability from a human-machine collaboration perspective.

[0052] The beneficial effects of this utility model are as follows: It has good anti-interference performance and can maintain stable radio frequency identification communication even in metallic environments.

[0053] It achieves a unique identification of pledged items and supports long-distance batch inspection and short-distance encrypted verification.

[0054] It provides a reliable anti-disassembly and anti-tampering mechanism, and any abnormal disassembly or damage will trigger an alarm.

[0055] It can create irreversible, permanent evidence records, ensuring that tampering is traceable.

[0056] It improves the efficiency of collateral inspection, reduces the intensity of manual operations, and enhances regulatory transparency.

[0057] It provides legal and compliance evidence to help reduce the risk exposure of financial institutions.

[0058] It can be widely applied to various types of collateral such as bulk commodities, machinery and equipment, and vehicles, and has good versatility and scalability. Attached Figure Description

[0059] Figure 1 : A three-dimensional structural schematic diagram of this utility model; Figure 2 : A schematic diagram of the installation position of the printed circuit board of this utility model; Figure 3 : Exploded view of the three-dimensional structure of this utility model; Figure 4 : Exploded side view of this utility model; In the diagram: 1-Front shell, 2-Rear shell, 3-Through fastener, 4-Printed circuit board, 5-Dual-band RFID unit, 6-Integrated RF antenna assembly, 7-Composite isolation layer, 8-Conductive mesh, 9-Alarm circuit, 10-Physical fuse, 11-Visual positioning marking surface, 12-Elastic seal, 41-Anti-tamper detection terminal, 31-Screw, 32-Irreversible nut component, 33-Conductive sleeve. Detailed Implementation

[0060] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: Example: Figure 1-4 As shown, an anti-interference electronic identification tag for pledged items includes a front shell 1, a rear shell 2, through-fasteners 3, a printed circuit board 4, an integrated radio frequency antenna assembly 6, a composite isolation layer 7, a conductive mesh 8, and an alarm circuit 9. The front shell 1 and the rear shell 2 are fitted together to form an internal cavity, which houses the printed circuit board 4 and its related electronic components. The front shell 1 and the rear shell 2 are secured by at least two through-fasteners 3, and the locking part forms an annular sealing groove. An elastic sealing element 12 is embedded in the groove to ensure the overall structure's waterproof, dustproof, and anti-interference capabilities.

[0061] The front shell 1 is preferably made of 304 stainless steel or 316 stainless steel to ensure its mechanical strength and corrosion resistance; the rear shell 2 can be made of engineering plastic or aluminum alloy depending on the usage environment to balance lightweight and strength. The outer surface of the front shell 1 is machined with a visual positioning marking surface 11, which has an area of ​​not less than 40mm × 40mm. It can be formed by laser etching or ceramic ink printing, which not only has wear-resistant and fade-resistant properties, but also provides a visual reference for manual or machine inspection.

[0062] The printed circuit board 4 is fixedly mounted inside the rear shell 2, and integrates a main control chip, non-volatile memory, tamper detection terminal 41, and alarm circuit 9. The non-volatile memory can be EEPROM or Flash, and its OTP area can be written to in one go. The main control chip communicates with an external reader / writer through an RF unit and is responsible for monitoring the status of the tamper circuit and controlling alarm recording.

[0063] The radio frequency module section of printed circuit board 4 includes a dual-frequency radio frequency identification unit 5, comprising an ultra-high frequency (UHF) radio frequency chip and a high-frequency radio frequency chip. The UHF radio frequency chip operates in the 860–960 MHz frequency band and is primarily used for long-distance batch identification; the high-frequency radio frequency chip operates at 13.56 MHz and is primarily used for short-distance encryption verification and interaction. This dual-frequency combination enables the signage to possess both long-distance identification efficiency and short-distance security authentication capabilities, meeting the regulatory needs of various scenarios in the financial sector.

[0064] An integrated RF antenna assembly 6 is mounted inside the front housing 1 and is made of a flexible printed circuit board (FPC). A zigzag-shaped UHF antenna and a closed-loop high-frequency coil are arranged on it. A 2–5 mm air gap is maintained between the antenna and the front housing 1 to reduce the shielding effect of the metal housing on the signal. A composite isolation layer 7 is provided between the antenna and the printed circuit board 4. The isolation layer adopts a laminated structure of ferrite sheets and dielectric pads, with the ferrite sheet thickness ranging from 0.8 to 1.5 mm, effectively improving the electromagnetic field distribution and enhancing RF communication performance.

[0065] A conductive mesh 8 is laid between the printed circuit board 4 and the rear shell 2. This mesh is formed by printing copper or silver paste lines onto a flexible substrate, with a line width of 0.2–1.0 mm and a mesh spacing of 5–15 mm. Its lead-out pads are connected to the tamper-evident detection terminal 41 via crimping or soldering, while some pads are electrically connected to the metal parts of the shell via through-fasteners 3. When someone attempts to disassemble, cut, or damage the sign, the conductive mesh 8 will be disrupted, causing a loss of circuit continuity, thus triggering detection.

[0066] The through-fastener 3 can be an anti-tamper bolt or rivet, and its structure includes a screw 31, an irreversible nut component 32, and a conductive sleeve 33. The screw 31 penetrates the front shell 1 and the rear shell 2 for locking, and the conductive sleeve 33 forms a press-fit contact with the pads of the conductive mesh 8, achieving the dual functions of mechanical fixation and electrical connection. The irreversible nut component 32 undergoes plastic deformation during disassembly, leaving irreversible traces, ensuring that tampering can be visually identified.

[0067] Regarding the power module, printed circuit board 4 can be equipped with a built-in button-type or thin-film lithium battery compartment, with electrical connection provided by battery contact springs to achieve active power supply; alternatively, without a battery compartment, it can rely on an ultra-high frequency radio frequency chip to obtain power through energy transfer to achieve passive power supply. This dual-mode power supply solution can not only meet the needs of high-performance application scenarios, but also leverage its long lifespan advantage in maintenance-free applications.

[0068] The alarm circuit 9 includes a continuity detector, a logic latch, and a physical fuse 10. The continuity detector monitors the integrity of the conductive grid 8 in real time; if a break is detected, it drives the logic latch to maintain an alarm state. The physical fuse 10 is connected to the OTP area of ​​the non-volatile memory; when unauthorized disassembly is detected, it is burned out, triggering a one-time write to create a permanent record. This alarm result can be read through the radio frequency unit, serving as an important basis for the supervision of pledged assets.

[0069] The sign can be fixed to the collateral in three ways: first, by directly inserting through fasteners; second, by bonding it to the surface of the collateral using structural adhesive pads; and third, by spot welding it to the metal body of the collateral. In particular, for the welding method, at least one weld point must be connected to the conductive mesh 8 to further enhance the tamper-proof detection function.

[0070] In the daily supervision and inspection of financial collateral, the workflow of this electronic sign mainly includes four stages: installation, initialization, operation monitoring, and alarm handling.

[0071] During the installation phase, supervisors first select a suitable fixing method to securely install the identification plate onto the collateral. For metallic collateral, mechanical fixing can be achieved through tamper-proof bolts or spot welding; for non-metallic collateral, structural adhesive pads can be used for bonding. After installation, the conductive mesh 8 and the tamper-proof detection terminal 41 form a complete closed circuit, and at least one fastener or solder point is connected to the conductive mesh 8, ensuring the entire tamper-proof detection system is in normal working condition.

[0072] During the initialization phase, the main control chip establishes communication with an external reader / writer via an RF interface. Supervisory personnel can write the unique identification information of the pledged assets, the regulatory agency code, and the initialization status information into non-volatile memory, and lock some data in the OTP area to ensure its immutability. At this point, the system enters standby mode.

[0073] During the operation and monitoring phase, the signage interacts with external devices via the dual-frequency radio frequency identification unit 5. If a long-distance inventory method is used externally, the reader can quickly obtain the identity information of multiple pledged items through the ultra-high frequency radio frequency chip, enabling batch counting and remote inspection. In close-range authentication scenarios, point-to-point encrypted communication is conducted through the high-frequency radio frequency chip to ensure the security of data interaction. Due to the design of an air gap and a composite isolation layer 7 in the integrated radio frequency antenna assembly 6, the communication process is not easily interfered with by the metal casing, resulting in a high and stable signal recognition rate.

[0074] Throughout operation, the conductive mesh 8 is continuously monitored for continuity. The alarm circuit 9 monitors its status in real time, and upon detecting damage to the conductive mesh, loose fasteners, or broken solder joints, the continuity detector transmits an anomaly signal to the logic latch. The logic latch immediately maintains the anomaly in an "alarm state" and triggers the physical fuse 10 to blow. The blowing of the fuse simultaneously triggers a one-time write to the non-volatile memory (OTP) area, permanently recording the event. Even if an attacker subsequently restores the circuitry, the system will still show traces of "unauthorized disassembly," ensuring traceability.

[0075] During the alarm handling phase, inspection personnel or automated inspection robots access the data on the signboard via a reader. If a normal status is read, it indicates that the pledged assets have not been illegally manipulated; if an alarm status is read, corresponding measures can be taken immediately, such as verifying the integrity of the pledged assets, reporting the anomaly, or triggering the risk disposal process. Because the alarm circuit uses a permanent recording mechanism, even if the pledged assets are later manually restored, the traces of any unauthorized operation cannot be erased.

[0076] The entire workflow forms a closed-loop system from installation to use, and from protection to testing. In this way, financial institutions can conduct real-time and effective monitoring and inspection of the pledged assets, significantly reducing the risk of the pledged assets being replaced, tampered with, or illegally disposed of.

[0077] The working principle of this electronic identification tag for pledged assets is to achieve identification and tamper-proof supervision of financial pledged assets through the synergistic effect of four core mechanisms: physical protection, radio frequency communication, tamper-proof detection, and permanent recording.

[0078] Firstly, in terms of physical protection, the front shell 1 and rear shell 2 are locked together by through fasteners 3, forming an independent protective space inside the cavity. The front shell 1 is made of stainless steel, while the rear shell 2 is made of engineering plastic or aluminum alloy, ensuring that the shell has sufficient resistance to damage. The epoxy potting compound at the mating surface and the elastic sealant 12 work together to provide the entire structure with waterproof and dustproof properties, and can resist external mechanical impact and chemical corrosion. The plastic deformation characteristics of the irreversible nut component 32 ensure that any attempt to disassemble it will leave permanent mechanical marks.

[0079] Secondly, in terms of radio frequency communication, the dual-band RFID unit 5 implements two operating modes. The ultra-high frequency RF chip utilizes the zigzag antenna of the integrated RF antenna assembly 6 for long-distance communication, suitable for warehouse inventory and batch inspection; the high frequency RF chip utilizes a loop coil for near-field coupling with an external reader / writer, suitable for security authentication and encrypted interaction. Since the front shell 1 is a metal structure, a 2-5mm air gap is maintained between the antenna and the metal, and a composite isolation layer 7 is provided. Ferrite sheets shield against metal interference, and a dielectric pad optimizes the electric field distribution, thereby ensuring the stability and anti-interference capability of dual-band communication.

[0080] Furthermore, regarding tamper detection, a conductive mesh 8 is laid between the printed circuit board 4 and the back cover 2, forming a covering conductive structure. The mesh lines are 0.2–1.0 mm wide and spaced 5–15 mm apart, allowing them to be cut off in the event of any localized damage. The pads of the conductive mesh 8 are connected to the tamper detection terminals 41 via crimp posts or solder joints. Some pads are also directly connected to the through-fasteners 3 or solder joints, ensuring that damaging the outer shell, loosening the fasteners, or cutting the solder joints will alter the circuit state. A continuity detector monitors the electrical integrity of the conductive mesh in real time, and any interruption will immediately trigger a subsequent alarm mechanism.

[0081] Finally, regarding alarm and logging, the signal input from the continuity detector is fed into a logic latch. The logic latch maintains the transient anomaly in a stable state and drives the physical fuse 10 to blow. The fuse blowing process is equivalent to an irreversible operation, simultaneously triggering a one-time write to the non-volatile memory OTP area, thus forming a permanent record in the memory. This record can be read by an RF reader during subsequent inspections, making tampering impossible to conceal. Even if an attacker repairs the conductive mesh or replaces the fuse, the state of the OTP area has been irreversibly changed, fundamentally ensuring the traceability of tampering traces.

[0082] In summary, the sign works as a closed-loop system of "protection-detection-alarm-recording": the outer shell and seal provide a physical barrier, the radio frequency unit enables identification, the conductive mesh forms an anti-tamper detection path, and the alarm circuit 9 completes triggering and permanent recording. Each link complements the others, jointly achieving comprehensive supervision and protection of the pledged assets.

[0083] In the financial sector, the supervision and inspection of pledged assets are crucial for ensuring the safety of credit funds. Pledged assets are diverse, including commodities (such as non-ferrous metals, rubber, and grain), machinery, and vehicles. These assets need to be protected from substitution, misappropriation, or illegal disposal during storage and transfer. Traditional methods relying on manual inspections and paper documents suffer from inefficiency, information delays, and high risks of tampering. Installing interference-resistant electronic tags on pledged assets can significantly improve the reliability and transparency of supervision.

[0084] In warehousing supervision scenarios, each piece of collateral entering the warehouse is tagged with an identification tag by supervisors upon arrival. An RFID reader then writes the collateral's identity information, warehousing information, and financial contract information into a non-volatile memory. Subsequently, warehouse managers or inspectors can quickly inventory all collateral in the warehouse from a distance of several meters using a handheld UHF reader. The system automatically compares the data with the database information, achieving efficient inventory checks. For collateral requiring further verification, it can be encrypted and read at close range using an HF chip to verify uniqueness and prevent counterfeiting.

[0085] In inspection scenarios, regulatory agencies can deploy drones or automated inspection robots. These devices use cameras to identify the visual positioning marker surface 11 on the front housing 1, quickly locating the marker's position, and then read the electronic data via an RFID interface. Because the visual positioning marker surface area is no less than 40mm × 40mm, it can be efficiently identified even in dimly lit or cluttered environments. This reduces manual labor and improves inspection coverage and accuracy.

[0086] In risk management scenarios, if the collateral is illegally dismantled or tampered with, the conductive grid 8 will disconnect, triggering the alarm circuit 9 to blow the physical fuse 10, leaving a permanent record in the OTP area of ​​the non-volatile memory. Once supervisory personnel discover the alarm status during inspections, they can immediately report it to the system and initiate corresponding risk control measures, such as freezing loans, verifying the actual condition of the collateral, or tracing responsible parties. This process forms a dual guarantee of "physical traces + electronic evidence," making the security supervision of the collateral highly traceable and legally effective.

[0087] In daily management, the signage can also be integrated with the information platforms of financial institutions. The monitoring system can collect inspection results in real time and generate a dynamic ledger of the pledged assets. The ledger includes the quantity, location, status, and alarm records of the pledged assets, achieving closed-loop management from warehousing to financial transactions. This not only improves the transparency of pledged asset supervision but also reduces financial risks caused by information asymmetry.

[0088] As can be seen from the above application scenarios, the electronic identification tag plays multiple roles in the supervision of financial collateral, including "unique identification, anti-tampering detection, permanent record storage, and remote inspection assistance," providing financial institutions and regulatory authorities with a practical and scalable technical means.

[0089] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An anti-interference electronic identification tag for pledged assets, characterized in that, include: A front shell (1) and a rear shell (2) that can be detached from and closed to form an internal cavity, wherein the front shell (1) and the rear shell (2) are locked by at least two through fasteners (3) and form an annular sealing groove around their periphery; The internal cavity is provided with a printed circuit board (4) fixed on the rear shell (2), on which a main control chip and non-volatile memory and at least two anti-tamper detection terminals (41) are arranged. The printed circuit board (4) is provided with a dual-frequency radio frequency identification unit (5), which includes an ultra-high frequency radio frequency chip and a high frequency radio frequency chip. The dual-frequency radio frequency identification unit (5) is electrically connected to an integrated radio frequency antenna assembly (6), which is located inside the front shell (1) and maintains a predetermined distance from the front shell (1). A composite isolation layer (7) is provided between the printed circuit board (4) and the front shell (1). It is located between the integrated radio frequency antenna assembly (6) and the printed circuit board (4) and is fixed to the inner wall of the rear shell (2) by adhesive bonding. A conductive mesh (8) is provided between the printed circuit board (4) and the back cover (2), which is a conductive line array printed on a flexible substrate; at least two lead-out pads of the conductive mesh (8) are electrically connected to the tamper detection terminal (41) of the printed circuit board (4). The through fastener (3) is an anti-disassembly bolt or rivet. The through fastener (3) passes through the front shell (1) and through the rear shell (2), and forms electrical contact with at least one pad of the conductive mesh (8). An alarm circuit (9) is provided on the printed circuit board (4), and one input terminal of the alarm circuit (9) is electrically connected to the conductive grid (8); the alarm circuit (9) includes a physical fuse (10).

2. The signage according to claim 1, characterized in that, The mating surfaces of the front shell (1) and the rear shell (2) are coated with epoxy potting compound; the material of the front shell (1) is 304 stainless steel or 316 stainless steel; the material of the rear shell (2) is engineering plastic or aluminum alloy; an elastic sealing element (12) is embedded in the annular sealing groove, which is pressed tight when the front shell (1) and the rear shell (2) are locked together.

3. The signage according to claim 1, characterized in that, The through fastener (3) includes a screw (31), an irreversible nut component (32) and a conductive sleeve (33). The conductive sleeve (33) forms a press contact with the pads of the conductive mesh (8). The irreversible nut component (32) undergoes plastic deformation during disassembly to form irreversible mechanical marks.

4. The signage according to claim 3, characterized in that, The sign is fixed to the pledged object body by the through fastener (3), or fixed to the pledged object surface by the structural adhesive pad, or fixed to the pledged object body by spot welding, and at least one weld point is electrically connected to the conductive mesh (8).

5. The signage according to any one of claims 1-4, characterized in that, The printed circuit board (4) is powered by a power module, which includes at least one of the following structures: A button or thin-film lithium battery compartment is embedded in the cavity, and the button or thin-film lithium battery compartment is electrically connected to the printed circuit board (4) through a battery contact spring. Alternatively, when the battery compartment is not provided, the printed circuit board (4) can achieve passive induction power supply only through the energy transmission of the UHF chip.

6. The signage according to any one of claims 1-4, characterized in that, The integrated radio frequency antenna assembly (6) is formed by a flexible printed circuit board, on which an ultra-high frequency antenna is formed in the form of a zigzag line and a closed loop high frequency coil is formed on the same or another layer; an air gap of 2 to 5 mm is maintained between the integrated radio frequency antenna assembly (6) and the front shell (1).

7. The signage according to claim 6, characterized in that, The composite isolation layer (7) is a stacked structure, including a ferrite sheet and a dielectric pad layer; the ferrite sheet is located on the side close to the integrated radio frequency antenna assembly (6), the dielectric pad layer is located on the side close to the printed circuit board (4), and the thickness of the ferrite sheet is 0.8 to 1.5 mm.

8. The signage according to any one of claims 1-4, characterized in that, The conductive grid (8) is formed by copper or silver paste printed lines, the line width is 0.2 to 1.0 mm, and the grid spacing is 5 to 15 mm; the metallized pads of the conductive grid (8) are electrically connected to the tamper detection terminal (41) on the printed circuit board (4) through crimping posts or solder joints.

9. The signage according to any one of claims 1-4, characterized in that, The alarm circuit (9) includes a continuity detector, a logic latch and a physical fuse (10). The physical fuse (10) is disposed in a fuse holder on the printed circuit board (4) and connected to the OTP area of ​​the non-volatile memory, and is used to trigger a one-time write when a disassembly is detected.

10. The signage according to any one of claims 1-4, characterized in that, The outer surface of the front shell (1) is provided with a visual positioning mark surface (11), which is formed by laser etching or ceramic ink printing; the area of ​​the visual positioning mark surface (11) is not less than 40mm×40mm.

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