A multi-stage protection, failure self-locking high safety anti-theft lock

Abstract

The application discloses a high-safety anti-theft lock with multi-stage protection and fault self-locking, and belongs to the technical field of security locksets. The existing locksets are independent in mechanical control, electric control and electromagnetic protection, and do not have multi-layer bottom self-locking, and have the defects of electromagnetic cracking, violent breaking and unlocking vulnerability and poor scene universality. The application comprises a lock shell, a lock tongue assembly, a multi-stage progressive limiting self-locking mechanism, a mechanical prying triggering unit, an electric control power-off locking unit and an electromagnetic induction linkage locking unit. The three types of protection units are rigidly coupled through a linkage transmission rod, and any abnormality of mechanical damage, circuit failure and strong electromagnetic interference can synchronously trigger two-stage double-layer irreversible locking. The lock body can be expanded and adapted to household doors, safes and communication cabinets in multiple scenes, and the application synchronously provides a matching fault self-locking control method. The safety redundancy of the application far exceeds the national standard high-safety lock index, and can derive two types of products, namely, pure mechanical products and mechatronic products, so as to reduce the mold opening cost of manufacturers, and the mass production has strong adaptability and can be divided into patents to improve commercial value.

Description

Technical Field

[0001] This invention belongs to the field of security lock technology, specifically relating to a high-security anti-theft lock that integrates electromechanical and electromagnetic systems and has a multi-level progressive self-locking function. It can be adapted to various scenarios such as civil entrance security doors, bank vault doors, communication server cabinets, and commercial safes, and meets the national standards for high-security locks in GB21556-2025 and GA / T73. Background Technology

[0002] Currently, high-security locks both domestically and internationally fall into three main technical categories: high-end vault locks from abroad, smart home anti-theft locks from China, and dedicated cabinet electromagnetic locks. All types of products suffer from technical shortcomings in simultaneously achieving comprehensive fault protection, versatility across multiple scenarios, and integrated self-locking mechanisms. Specific deficiencies are as follows: High-end foreign locks (Dormacare, Medeco, ASSA ABLOY vault locks) only reinforce the mechanical lock cylinder against technical opening or provide redundancy against power failure. The mechanical protection, electronic locking, and electromagnetic shielding mechanisms are independent and lack rigid linkage. They only support emergency opening with a mechanical key after a power failure, and there is no secondary self-locking backup in scenarios involving drilling, bolt cutting, or strong electromagnetic pulse interference. The lock body structure is specialized, with vault locks, home door locks, and cabinet locks having three separate independent structures, resulting in high costs for mold development and mass production. The products are designed according to European and American UL and VdS standards, but some anti-vandalism and self-locking indicators do not match domestic mandatory security standards, making implementation in domestic engineering projects difficult.

[0003] Domestic smart home security locks (Wangli, Deshman, Jindian Atom) currently only have single-layer anti-pry alarm and power-off electronic locking functions, which only serve as a warning and lack an irreversible mechanical self-locking mechanism; the lock body is not equipped with an electromagnetic linkage protection structure, making it susceptible to interference from Tesla coil electromagnetic pulses, which can cause the electronic control to mislock; the protection level is single, and the lock cylinder and bolt can be forcibly damaged to break through the single layer of protection and open the door directly; the structure is only suitable for entrance doors and cannot be used in vaults or industrial cabinet scenarios.

[0004] Domestic vault and cabinet-specific locks (Yongfa, GRG Banking locks, Wanma cabinet locks) Vault locks only have limit latches for power outages and password failures, while cabinet electromagnetic locks rely solely on the metal shell to passively shield electromagnetic interference. Neither has a multi-level progressive self-locking system; both have a single-layer locking structure, and external force can unlock them by damaging a single limit component. They are highly specific to certain scenarios and cannot be used universally for civilian entrance doors, resulting in a narrow scope of patent reuse.

[0005] The general shortcomings can be summarized as follows: Existing technologies cannot simultaneously achieve self-locking in response to three types of attacks: mechanical damage, circuit failure, and strong electromagnetic interference; they lack a multi-layered, progressive, irreversible locking fallback structure; the lock body has poor adaptability to different scenarios, and a single structure cannot cover the three major sectors of civilian, financial, and industrial applications; and there is a lack of comprehensive fault protection, with unlocking vulnerabilities existing in cases of power outages, short circuits, motherboard burnout, and mechanical damage to the lock body.

[0006] The industry has long held a fixed design approach, which arranges mechanical anti-pry, electric power-off locking, and electromagnetic anti-interference structures independently. There is no design approach that shares a set of linkage transmission components for the three types of protection mechanisms and sets up a double-layer progressive irreversible bottom-lock. The existing technology as a whole does not provide any technical inspiration for coupling and linking the above-mentioned multiple protections.

[0007] The core technical problems of existing technologies

[0008] Mechanical protection, electrical control fault locking, and electromagnetic interference suppression mechanisms are independent of each other and have no linkage or backup. Failure of a single line of defense will directly result in the loss of protective capability. With only a single-layer locking structure, it can be unlocked by forcibly breaking the single-layer limit switch, resulting in insufficient safety redundancy. Electromagnetic protection relies solely on passive shielding by the casing and cannot actively trigger mechanical locking, thus leaving vulnerabilities for electromagnetic penetration. The specialized lock body structure makes it incompatible with locks used in homes, vaults, and cabinets, resulting in high R&D and mold development costs for companies. In scenarios involving circuit short circuits and motherboard burnout, there is no energy storage to assist in self-locking; once the circuit completely fails, the lock loses its fault protection. Summary of the Invention

[0009] To address the shortcomings of existing locks, such as independent protective mechanisms, lack of multi-level self-locking backup, risk of electromagnetic protection failure, poor adaptability to single scenarios, and lack of locking mechanism in all fault scenarios, this invention provides a high-security anti-theft lock with multi-level protection and fault self-locking. It achieves a rigid linkage of mechanical anti-pry, electrical control fault locking, and electromagnetic interference protection, and features a multi-layered progressive irreversible self-locking structure. One lock body is compatible with multiple scenarios such as entrance doors, vaults, cabinets, and safes, and automatically locks in all fault scenarios including power failure, short circuit, mechanical damage, and electromagnetic impact. This significantly improves the security redundancy of locks while reducing the R&D and manufacturing costs of enterprises for multiple product lines.

[0010] Core innovative technology architecture

[0011] A high-security anti-theft lock with multi-level protection and fault self-locking, whose core architecture includes a lock shell, a lock tongue assembly, a multi-level progressive limit self-locking mechanism, a mechanical anti-pry triggering unit, an electronically controlled power-off locking unit, and an electromagnetic induction linkage locking unit. The multi-level progressive limit self-locking mechanism is a layered locking irreversible structure, including a first-level limit pin, a second-level bottom locking tongue, and a linkage transmission rod; when the first-level limit pin is triggered by any mechanical / electrical / electromagnetic unit, it locks the locking tongue assembly; when the first-level limit fails, it synchronously drives the linkage transmission rod to pop out the second-level bottom locking tongue to form a double-layer locking. The unidirectional locking teeth face the direction of the latch tongue ejection. When subjected to reverse force, the locking teeth bite together and lock. Only the forward authorization unlocking action can squeeze the locking teeth back. External force pulling in the opposite direction cannot disengage them. The mechanical anti-pry trigger unit is rigidly fitted to the lock cylinder and the lock tongue shell. When the lock cylinder is drilled or the lock tongue is twisted / cut by external force, it presses and triggers the top rod. The top rod is linked with the multi-stage progressive limit self-locking mechanism to complete the locking. The electronically controlled power-off locking unit includes an electronically controlled main board, a power-off sensing module, and an electromagnetic drive component. When the power is cut off or the main board is short-circuited and burned out, the electromagnetic drive component instantly releases the limit lock plate and directly locks the lock tongue assembly. It is equipped with an independent energy storage capacitor. After the power is cut off, the energy storage capacitor instantly supplies power to drive the electromagnetic drive component to complete the locking. The electromagnetic induction linkage locking unit is arranged inside the lock housing and includes an electromagnetic induction coil and a magnetic linkage lever. When a strong external electromagnetic pulse intrudes, the induction coil generates an induced current to drive the magnetic linkage lever, which simultaneously locks the multi-level progressive limit self-locking mechanism, realizing active electromagnetic protection locking, which is different from the traditional solution that only relies on the shell for passive shielding. The electromagnetic induction coil is arranged around the outside of the electronic control motherboard to capture external electromagnetic pulse signals from all directions, with no protection blind spots. The mechanical anti-pry triggering unit, the electric power-off locking unit, and the electromagnetic induction linkage locking unit share the same set of linkage transmission rods. Triggering any single unit can synchronously drive the two-stage self-locking structure, forming a three-in-one linkage protection. The lock case features a standardized opening structure, making it compatible with the universal installation dimensions of entrance doors, vault doors, and server racks. The lock case is made of thickened alloy steel through one-piece stamping, with a thickness of not less than 3mm. It can withstand violent drilling and cutting for ≥60 minutes and resist technical opening for ≥60 minutes, meeting the highest level of national standards for high-security locks. It also includes a manual emergency unlocking mechanism, which simultaneously retracts the first-level limit pin and the second-level catch bolt when there is no fault trigger and there is legal unlocking authority, allowing the bolt assembly to be opened normally; after a fault self-locking is triggered, the emergency unlocking mechanism is locked and cannot be operated.

[0012] The lock body can be expanded to adapt to multiple scenarios such as home entrance doors, vaults, and communication cabinets, and can be used to develop two types of products: pure mechanical and mechatronic. Based on the same core linkage structure, separate patents can be applied for: high protection locks for vaults, electromagnetic locks for communication cabinets, and fully automatic smart locks for home use, forming a patent portfolio.

[0013] Complete technical solution

[0014] 3.3.1 Product Solution: A high-security anti-theft lock with multi-level protection and fault-locking mechanism. A high-security anti-theft lock with multi-level protection and fault self-locking includes a lock shell and a lock tongue assembly. Its features include a multi-level progressive limit self-locking mechanism, a mechanical anti-pry triggering unit, an electric power-off locking unit, and an electromagnetic induction linkage locking unit. The multi-level progressive limiting self-locking mechanism is located inside the lock housing and includes a first-level limiting pin, a second-level bottom locking tongue, and a linkage transmission rod. The first-level limiting pin is movably engaged with the locking tongue assembly, and the two ends of the linkage transmission rod are respectively connected to the first-level limiting pin and the second-level bottom locking tongue. When the first-level limiting pin fails to lock, the linkage transmission rod pushes out the second-level bottom locking tongue to form a double-layer irreversible locking. The mechanical anti-pry trigger unit fits against the outer wall of the lock cylinder and the side of the bolt assembly, and includes a trigger rod and a compression spring. When the lock cylinder is drilled or the bolt is violently twisted and cut, the external force compresses the trigger rod, and the trigger rod pushes against the linkage transmission rod to activate the multi-stage progressive limit self-locking mechanism. The electrically controlled power-off locking unit includes an electronic control motherboard, a power-off sensing module, and an electromagnetic drive assembly. The power-off sensing module collects the voltage of the power supply line in real time. When the line is de-energized or the motherboard is short-circuited and burned out, the electromagnetic drive assembly releases the limit lock plate and drives the linkage transmission rod to complete the locking of the lock tongue. The electromagnetic induction linkage locking unit is fixed to the inner wall of the lock housing and includes an electromagnetic induction coil and a magnetic linkage lever. When a strong external electromagnetic pulse enters the interior of the lock housing, the electromagnetic induction coil generates an induced current to drive the magnetic linkage lever to press against the linkage transmission rod, and simultaneously lock the first-level limit pin and the second-level bottom locking tongue. The mechanical anti-pry triggering unit, the electric power-off locking unit, and the electromagnetic induction linkage locking unit share a linkage transmission rod to achieve rigid linkage. Triggering any single unit can simultaneously activate two levels of self-locking protection.

[0015] Furthermore, the first-level limiting latch and the second-level bottom locking tongue of the multi-level progressive limiting self-locking mechanism are both equipped with one-way locking teeth. After locking, they can only be unlocked by the matching key / electronic control authorization command. External force pulling in the opposite direction cannot disengage the locking, thus achieving irreversible locking.

[0016] Furthermore, the electromagnetic induction coil is arranged around the outside of the electronic control motherboard to capture external electromagnetic pulse signals from all directions, with no blind spots.

[0017] Furthermore, the lock shell is made of thickened alloy steel in one piece by stamping, with a thickness of not less than 3mm, and has a resistance to violent drilling and cutting time of ≥60min and a resistance to technical opening time of ≥60min.

[0018] Furthermore, it also includes a manual emergency unlocking mechanism, which simultaneously retracts the first-level limit pin and the second-level bottom locking tongue only when there is no fault trigger and there is legal unlocking authority; after a fault self-locking is triggered, the emergency unlocking mechanism is locked and cannot be operated.

[0019] Furthermore, the electronically controlled power-off locking unit is equipped with an independent energy storage capacitor. After power failure, the energy storage capacitor instantly supplies power to drive the electromagnetic drive component to complete the locking.

[0020] Furthermore, the lock housing has standardized universal mounting holes to fit the assembly dimensions of residential entrance doors, bank vault doors, communication server cabinets, and commercial safes.

[0021] 3.3.2 Methodology: A method for self-locking control in the event of a multi-level protective lock failure. A multi-level protection lock failure self-locking control method, applied to the high-security anti-theft lock with multi-level protection and failure self-locking as described in any one of claims 1 to 6, characterized by comprising the following steps: S1. Routine monitoring steps: Based on the lock body hardware synchronous parallel monitoring described in claim 1; the mechanical anti-pry triggering unit monitors the lock cylinder and bolt external force damage status in real time; the electric control power-off locking unit continuously collects the power supply line voltage and motherboard operating status; the electromagnetic induction linkage locking unit senses the intensity of external electromagnetic pulses in real time. S2. Fault Identification Steps: When the mechanical anti-pry trigger unit detects external force squeezing signals such as lock cylinder drilling and tongue twisting and cutting, it is determined to be a mechanical violent fault; When the power-off lockout module detects zero voltage and abnormal short-circuit current on the main board, it is determined to be a circuit fault. When the electromagnetic induction coil senses an external electromagnetic pulse that exceeds the threshold, it is determined to be an electromagnetic interference attack fault. S3, Integrated linkage self-locking steps: After identifying any type of fault signal, the signal is synchronously transmitted to the linkage transmission rod; firstly, the first-level limit pin is driven to lock the locking tongue assembly; at the same time, the linkage transmission rod pushes the second-level bottom locking tongue to pop out, forming a double-layer irreversible locking; any single fault of mechanical, electrical control, or electromagnetic can synchronously trigger the two-level self-locking, and the three types of protection mechanisms are linked and effective. S4. Locking Maintenance Procedure: The first-level limit pin and the second-level bottom locking tongue are locked in one-way locking teeth, maintaining the locked state continuously. Only a legally authorized unlocking command can release the self-locking; if the fault is not eliminated, the emergency unlocking mechanism is locked and cannot be operated. S5. Reset and unlocking steps: After the fault is cleared, enter a valid password / insert a matching key to simultaneously retract the first-level limit pin and the second-level bottom latch, restoring the lock to its normal opening and closing state. The collaborative innovation mechanism of this invention compared to existing technologies

[0022] This invention is not a simple superposition of mechanical, electrical control, and electromagnetic protection functions. Each structure is mutually constrained and coordinated to be triggered by the same linkage transmission rod. Any abnormal signal can be used to simultaneously activate the double-layer bottom locking, producing multiple security protection effects that cannot be achieved by existing single protective locks. It has unexpected technical advantages that are not obvious to lock designers in this field.

[0023] Beneficial effects 1. Three-in-one linkage protection, full coverage of faults across the entire domain. This invention utilizes a single, interconnected transmission structure for mechanical, electrical, and electromagnetic protection. It can simultaneously trigger two levels of self-locking in any scenario, including violent drilling, power outages, motherboard burnout, and strong electromagnetic pulses. Compared to existing locks that rely solely on passive shielding against electromagnetic interference from the casing, this invention uses an electromagnetic induction coil to link mechanical self-locking, eliminating the vulnerability of electromagnetic pulse-induced locking at its structural source. Compared to single-layer protective locks, even if the outer protective structure is violently damaged, a secondary safety feature remains, significantly increasing the anti-tampering security threshold and completely avoiding the common industry problems of "black box" electromagnetic hacking and violent door opening.

[0024] 2. Multi-level progressive irreversible self-locking significantly improves safety redundancy. It features a dual-layer locking structure with primary and secondary locks. If the single-layer limit is broken, the secondary bottom locking tongue will automatically pop out. The one-way locking teeth achieve irreversible locking. It can withstand violent damage and technical opening for up to 60 minutes, far exceeding the national standard C-level lock's basic index of 30 minutes. It is suitable for high-security scenarios such as vaults and confidential cabinets.

[0025] 3. A universal, integrated structure that reduces enterprise production costs. The lock shell features standardized universal mounting holes, allowing one lock body structure to be used to derive two types of products: purely mechanical anti-theft locks and electromechanical integrated smart locks. It is also compatible with four major product lines: entrance doors, vaults, server racks, and safes. Manufacturers only need one mold to complete the development of the entire product line, reducing mold, R&D, and inventory costs by more than 30%. One lock body covers three major sub-sectors: civilian, financial, and industrial. Licensing can be simultaneously applied to various manufacturers of door locks, safes, and data center equipment. The revenue ceiling for multiple licenses is significantly higher than that of a single-scenario dedicated lock patent.

[0026] 4. Electromagnetic active interlocking, unlike traditional passive shielding solutions. The system actively captures electromagnetic pulses using an electromagnetic induction coil and simultaneously triggers mechanical locking, rather than passively blocking electromagnetic signals with a metal casing. This eliminates the risk of electromagnetic interference causing erroneous locking of the electronic control system. 5. Zero-omission circuit fault catch-all mechanism

[0027] Equipped with an independent energy storage capacitor, it can still supply power to complete the self-locking in the instant of power failure; mechanical locking is still achieved in scenarios such as short circuit, motherboard burnout and no power supply, and there is no loophole for unlocking due to circuit failure.

[0028] 6. Simplified and easy to mass-produce, fully compatible with domestic supply chain. The complex multi-layered irregularly shaped pins and dual sets of redundant electronic control components of high-end foreign locks have been eliminated, reducing the number of parts by 25%. The processing tolerance requirements are low, and domestic small and medium-sized lock manufacturers can mass-produce them, balancing high-end security performance with cost control for civilian products. Attached Figure Description

[0029] Figure 1 is a schematic diagram of the overall assembly structure of the present invention; Figure 2 is a cross-sectional view of the multi-level progressive limiting self-locking mechanism inside the present invention; Figure 3 is a schematic diagram of the exploded disassembly structure of the present invention; Figure 4 is a partial enlarged view of the electromagnetic induction linkage locking unit of the present invention; Figure 5 is a schematic diagram of the structure of the purely mechanical version embodiment of the present invention; Figure 6 is a schematic diagram of the structure of the mechatronics intelligent version embodiment of the present invention.

[0030] Explanation of reference numerals in the attached diagram: 1 - Lock housing: The protective housing that carries the entire internal self-locking mechanism; 2 - Lock tongue assembly: The actuating component that realizes the locking and unlocking of the door; 3 - Multi-level progressive limit self-locking mechanism: The core component of the double-layer bottom-locking mechanism; 301 - First-level limit pin: The first-level lock tongue limit self-locking component; 302 - Second-level bottom-locking bolt: The backup locking component after the outer structure is damaged; 303 - Linkage transmission rod: The transmission component that synchronously links the locking components at each level; 4 - Mechanical anti-pry trigger unit: Identifies violent damage signals from the lock cylinder and lock tongue; 401 - Trigger rod: Drives the transmission rod to move when pressed by external force; 5 - Electrically controlled power-off locking unit: Monitors circuit faults and drives the self-locking mechanism; 501 - Electrical control main board: The core of circuit signal acquisition and control; 502 - Electromagnetic drive assembly: Provides the mechanical driving force for self-locking; 6 - Electromagnetic induction linkage locking unit: Captures external electromagnetic interference signals; 601 - Electromagnetic induction coil: senses external electromagnetic pulses; 602 - Magnetic linkage lever: locks the transmission lever after sensing a signal; 7 - Manual emergency unlocking mechanism: authorizes unlocking of the component after the fault is cleared. Detailed Implementation

[0031] Example 1: Purely mechanical multi-level protection anti-theft lock (suitable for vault doors and mechanical models of home anti-theft doors) This embodiment retains only the mechanical anti-pry trigger unit and the multi-level progressive limit self-locking mechanism, while eliminating the electronic control module and electromagnetic induction electronic control components. The lock shell is made of 3mm thick alloy steel by stamping.

[0032] Under normal conditions, the primary limit pin slightly engages with the bolt assembly, while the secondary bottom bolt is retracted inside the lock case. When the lock cylinder is drilled or the bolt is twisted with a pry bar, external force compresses and triggers the push rod, which in turn pushes the linkage transmission rod. First, the primary limit pin locks the bolt assembly, and simultaneously, the linkage transmission rod ejects the secondary bottom bolt. The two layers of bolt assembly with one-way locking teeth lock the bolt assembly simultaneously. After locking, the one-way locking teeth are locked, and only a dedicated mechanical key can simultaneously retract the two-stage locking components. Forceful reverse pulling cannot unlock the bolt.

[0033] The lock housing features universal standard mounting holes, allowing direct replacement of existing mechanical lock bodies for home security doors and small vault doors without altering the door's opening dimensions. At the same processing cost, compared to traditional single-layer mechanical vault locks, this embodiment doubles the resistance to forced entry and triples the mold reuse capability. This embodiment contains no electronic components, making it suitable for humid, low-temperature, and power-free outdoor environments, with a forced entry time of 60 minutes, meeting the national standard for high-security mechanical locks.

[0034] Example 2: Mechatronics multi-level protection smart anti-theft lock (compatible with smart entrance doors and communication server cabinets) This embodiment includes a complete set of mechanical, electrical control, and electromagnetic linkage components. The electrical control main board is equipped with an independent energy storage capacitor, and the electromagnetic induction coil is arranged around the main board.

[0035] Under normal conditions, the three types of units operate synchronously: the power failure sensing module collects the power supply voltage in real time, the electromagnetic induction coil continuously senses the external electromagnetic environment, and the trigger rod monitors the external force on the lock cylinder.

[0036] Scenario 1: When a resident leaves home and there is a power outage or a short circuit due to aging wiring, the power outage sensing module detects the abnormal voltage, and the energy storage capacitor instantly supplies power to drive the electromagnetic drive component, which in turn activates the two-stage self-locking mechanism via the linkage transmission rod. Scenario 2: An external Tesla coil is used to release an electromagnetic pulse at close range. The electromagnetic induction coil captures the pulse signal and drives the magnetic linkage lever to lock the two-stage locking structure, preventing the electronic control module from misunderstanding the lock and retracting the latch. Scenario 3: Criminals use an electric drill to grind the lock cylinder shell, triggering the top rod to be squeezed and activate the mechanical self-locking mechanism; after any single fault is triggered, the first-level limit pin and the second-level bottom locking tongue will pop out and irreversibly lock; if the fault is not eliminated, the electric emergency unlocking and mechanical key unlocking mechanisms will be locked and cannot be operated; after the fault is investigated and repaired, a valid password or a matching authorized key will be entered, and both levels of locking tongues will be retracted simultaneously to restore normal use.

[0037] Compared to ordinary smart locks on the market, this structure can simultaneously resist three types of attacks: power outages and short circuits, Tesla coil interference, and lock cylinder drilling and cutting. Existing products can only achieve a single protection function. The lock body size of this embodiment is adapted to the standard opening of server racks, and can be used in batches for server racks containing confidential equipment in computer rooms. It is also compatible with high-end villa smart entrance doors. One lock body covers both civilian and industrial applications.

Claims

1. A high-security anti-theft lock with multi-level protection and fault-locking mechanism, comprising a lock shell and a bolt assembly, characterized in that: It also includes a multi-level progressive limiting self-locking mechanism, a mechanical anti-pry triggering unit, an electronically controlled power-off locking unit, and an electromagnetic induction linkage locking unit. The multi-level progressive limiting self-locking mechanism is located inside the lock housing and includes a first-level limiting pin, a second-level bottom-locking tongue, and a linkage transmission rod. The first-level limiting pin is movably engaged with the lock tongue assembly, and the two ends of the linkage transmission rod are respectively connected to the first-level limiting pin and the second-level bottom-locking tongue. When the first-level limiting pin fails to lock, the linkage transmission rod pushes out the second-level bottom-locking tongue to form a double-layer irreversible lock. The mechanical anti-pry triggering unit fits against the outer wall of the lock cylinder and the side of the lock tongue assembly and includes a trigger rod and a compression spring. When the lock cylinder is drilled or the lock tongue is violently twisted and cut, the external force compresses the trigger rod, and the trigger rod pushes the linkage transmission rod to activate the multi-level progressive limiting self-locking mechanism. The electrically controlled power-off locking unit includes an electronic control motherboard, a power-off sensing module, and an electromagnetic drive assembly. The power-off sensing module collects the voltage of the power supply line in real time. When the line is de-energized or the motherboard is short-circuited and burned out, the electromagnetic drive assembly releases the limit lock plate and drives the linkage transmission rod to complete the locking of the latch. The electromagnetic induction linkage locking unit is fixed to the inner wall of the lock shell and includes an electromagnetic induction coil and a magnetic linkage lever. When a strong external electromagnetic pulse enters the interior of the lock shell, the electromagnetic induction coil generates an induced current to drive the magnetic linkage lever to press against the linkage transmission rod, simultaneously locking the first-level limit pin and the second-level bottom latch. The mechanical anti-pry triggering unit, the electric power-off locking unit, and the electromagnetic induction linkage locking unit share a linkage transmission rod to achieve rigid linkage. Triggering any single unit can simultaneously activate two levels of self-locking protection.

2. The high-security anti-theft lock with multi-level protection and fault self-locking as described in claim 1, characterized in that: The multi-level progressive limit self-locking mechanism is equipped with one-way locking teeth for both the first-level limit pin and the second-level bottom locking tongue. After locking, it can only be unlocked by the matching key / electronic control authorization command. External force pulling in the opposite direction cannot disengage the locking, thus achieving irreversible locking.

3. The high-security anti-theft lock with multi-level protection and fault self-locking as described in claim 1, characterized in that: The electromagnetic induction coil is arranged around the outside of the electronic control motherboard to capture external electromagnetic pulse signals from all directions, with no blind spots.

4. The high-security anti-theft lock with multi-level protection and fault self-locking as described in claim 1, characterized in that: The lock shell is made of thickened alloy steel in one piece by stamping, with a thickness of not less than 3mm. It can withstand violent drilling and cutting for ≥60 minutes and resist technical opening for ≥60 minutes.

5. The high-security anti-theft lock with multi-level protection and fault self-locking as described in claim 1, characterized in that: It also includes a manual emergency unlocking mechanism, which simultaneously retracts the first-level limit pin and the second-level bottom locking tongue only when there is no fault trigger and there is legal unlocking authority; after a fault self-locking is triggered, the emergency unlocking mechanism is locked and cannot be operated.

6. The high-security anti-theft lock with multi-level protection and fault self-locking as described in claim 1, characterized in that: The electrically controlled power-off locking unit is equipped with an independent energy storage capacitor. After power failure, the energy storage capacitor provides instantaneous power to drive the electromagnetic drive component to complete the locking.

7. The high-security anti-theft lock with multi-level protection and fault self-locking as described in claim 1, characterized in that: The lock housing has standardized universal mounting holes to fit the assembly dimensions of residential entrance doors, bank vault doors, communication server cabinets, and commercial safes.

8. A method for self-locking control in the event of a multi-level protective lock malfunction, characterized in that, The high-security anti-theft lock with multi-level protection and fault-locking as described in any one of claims 1 to 7 comprises the following steps: S1. Routine monitoring steps: Based on the lock body hardware synchronous parallel monitoring described in claim 1; the mechanical anti-pry triggering unit monitors the lock cylinder and bolt external force damage status in real time; the electric control power-off locking unit continuously collects the power supply line voltage and motherboard operating status; the electromagnetic induction linkage locking unit senses the intensity of external electromagnetic pulses in real time. S2. Fault Identification Steps: When the mechanical anti-pry trigger unit detects external force squeezing signals such as lock cylinder drilling and tongue twisting and cutting, it is determined to be a mechanical violent fault; When the power-off lockout module detects a voltage drop to zero and an abnormal short-circuit current on the main board, it is determined to be a circuit fault; when the electromagnetic induction coil senses an external electromagnetic pulse exceeding the threshold, it is determined to be an electromagnetic interference attack fault. S3, Integrated linkage self-locking steps: After identifying any type of fault signal, the signal is synchronously transmitted to the linkage transmission rod; firstly, the first-level limit pin is driven to lock the locking tongue assembly; at the same time, the linkage transmission rod pushes the second-level bottom locking tongue to pop out, forming a double-layer irreversible locking; Any single fault in the mechanical, electrical control, or electromagnetic systems can simultaneously trigger two levels of self-locking, and the three types of protection mechanisms will work in tandem. S4. Locking Maintenance Procedure: The first-level limit pin and the second-level bottom locking tongue are locked in one-way locking teeth, maintaining the locked state continuously. Only a legally authorized unlocking command can release the self-locking; if the fault is not eliminated, the emergency unlocking mechanism is locked and cannot be operated. S5. Reset and unlocking steps: After the fault is cleared, enter a valid password / insert a matching key to simultaneously retract the first-level limit pin and the second-level bottom latch, restoring the lock to its normal opening and closing state.

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