A simulation training device for the operation of electrical five-prevention interlocking

Abstract

This invention belongs to the field of nuclear power training technology and relates to a simulation training device for electrical five-proof interlocking operation, comprising: an interlocking key simulator: with a circular key socket at the bottom and an annular cylindrical key headphone jack in the middle of the circular key socket; a simulated key: with a cylindrical structure at the front end and a cylindrical key headphone plug matching the key headphone jack in the middle, the key ID number being transmitted to the key headphone jack through the key headphone plug; a simulated key detection module: used to detect the insertion state or rotation position of the simulated key; a simulated key control module: used to open or close the channel restricting the cylindrical teeth of the key, allowing or prohibiting the simulated key from rotating within the circular key socket; and an interlocking logic module: used to generate simulated key control commands based on the key ID number or the insertion or rotation position of the simulated key, controlling the simulated key control module to open or close the channel restricting the cylindrical teeth of the key.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power training technology, specifically relating to a simulation training device for the operation of electrical five-prevention interlocking. Background Technology

[0002] The current electrical five-prevention interlocking logic design of nuclear power plants is complex, making it impossible to conduct operation training on actual equipment.

[0003] The safe and stable operation of electrical systems is a crucial guarantee for the safety of nuclear power plants. The plant-wide mechanical interlocking system is a key device for achieving the "five-proof" interlocking requirements of electrical equipment. It constructs a plant-wide mechanical interlocking logic through the mechanical interlocking functions between different electrical devices. This system aims to prevent human error during electrical operations, ensuring that operators perform operations in a designated sequence; otherwise, subsequent operations cannot proceed. After a nuclear power plant is built and put into operation, all equipment systems must be maintained in the state required by technical specifications and cannot be arbitrarily changed. Therefore, the five-proof interlocking system needs to be adjusted according to changes in the unit's status and cannot be operated arbitrarily. Most of the electrical equipment involved in interlocking is relatively critical and sensitive. Operating personnel are mainly trained through theoretical learning, lacking hands-on training on actual equipment, which increases the risk of misoperation during practical operation. Summary of the Invention

[0004] The purpose of this invention is to provide a simulation training device for the operation of electrical five-proof interlocking. This device can be used for daily training on the operation of electrical five-proof interlocking in nuclear power plants, simulating the operation process of actual electrical five-proof interlocking equipment. Furthermore, the lock cylinder number, key ID number, and interlocking logic module in this device are all editable and configurable, and can automatically change according to actual operation information. Through the combination of multiple devices, it can meet the operation of all electrical five-proof interlocking keys.

[0005] Technical solution to achieve the purpose of this invention:

[0006] A simulation training device for electrical five-proof interlocking operation, the device comprising an interlocking key simulator, a simulated key, a simulated key detection module, a simulated key control module, and an interlocking logic module;

[0007] The bottom of the simulator faceplate of the interlocking key simulator is provided with a circular key socket, and the circular key socket is provided with a raised key tooth guide groove. The center of the circular key socket is provided with a ring-shaped cylindrical key headphone jack.

[0008] The front end of the simulated key has a cylindrical structure, and key-shaped teeth are provided along the outer circumference of the cylindrical structure at the front end of the simulated key. The key-shaped teeth match the key tooth guide groove. A columnar headphone plug is provided in the middle of the cylindrical structure at the front end of the simulated key, and the headphone plug matches the headphone jack. When the headphone plug contacts the headphone jack, the key ID number is transmitted to the headphone jack through the headphone plug.

[0009] The simulated key detection module and the simulated key control module are located inside the circular keyhole. The simulated key detection module is used to detect the insertion state or rotation position of the simulated key. The simulated key control module is used to open or close the channel that restricts the key's cylindrical teeth. When the channel that restricts the key's cylindrical teeth is open, the simulated key is allowed to rotate inside the circular keyhole. When the channel that restricts the key's cylindrical teeth is closed, the simulated key is prohibited from rotating inside the circular keyhole.

[0010] The interlocking logic module is used to generate analog key control commands based on the key ID number, the insertion status of the analog key, or the rotation status of the analog key, and to control the analog key control module to open or close the channel that restricts the key's columnar teeth.

[0011] The simulated key detection module includes a micro switch and a trapezoidal protrusion structure; two micro switches are spaced apart along the circumference inside the circular keyhole; the cylindrical structure at the front end of the simulated key has a trapezoidal protrusion structure along its outer circumference, and the trapezoidal protrusion structure matches the micro switch; the micro switch is opened by squeezing the trapezoidal protrusion structure to detect the insertion state or rotation position of the simulated key.

[0012] The simulated key control module includes a circular keyhole base, a motor bracket, a DC screw reducer motor, a key rotation stop, and an arc-shaped structure of the key rotation stop. The circular keyhole base is located inside the circular keyhole at the bottom of the simulator's front shell. The circular keyhole base has an arc-shaped limiting step and fixing holes for securing the key sensor PCB board and the motor bracket. The DC screw reducer motor is mounted on the motor bracket. The screw of the DC screw reducer motor is connected to the key rotation stop through a screw hole. Forward or reverse rotation of the DC screw reducer motor can drive the key rotation stop to rise and fall via the screw. The arc-shaped structure of the key rotation stop is connected to the key rotation stop. When the key rotation stop is raised, the arc-shaped structure also rises, opening the channel that restricts the key's columnar teeth, allowing the simulated key to rotate within the circular keyhole. When the key rotation stop is lowered, the arc-shaped structure also falls, closing the channel that restricts the key's columnar teeth, preventing the simulated key from rotating within the circular keyhole.

[0013] The simulated key control module also includes a limit sensor, which is mounted on the key sensor PCB board and is used to sense when the key rotation stop is raised and lowered.

[0014] The device also includes a marble and marble locking points; a marble is provided inside the circular keyhole along the circumference; the cylindrical structure at the front end of the simulated key is provided with two hemispherical inwardly recessed marble locking points at intervals along the outer circumference, and the marble locking points match the marble; by the marble being recessed into the marble locking points, the simulated key is indicated to rotate into position within the circular keyhole.

[0015] The device also includes a simulated key tag, which is attached to the simulated key and used to display information such as the key ID number and simulated key control commands.

[0016] The simulated key tag is equipped with a communication cable. When the simulated key is inserted into the circular keyhole, the key headphone plug of the interlocking key simulator supplies power to the simulated key tag through the communication cable and can update the display content on the simulated key tag according to the simulated key control command generated by the interlocking logic module. After the simulated key is removed, the content displayed on the simulated key tag does not disappear.

[0017] The simulated key tag is an e-ink screen.

[0018] The beneficial technical effects of this invention are as follows:

[0019] 1. The present invention provides a simulation training device for electrical five-proof interlocking operation. Through a simulation key detection module, a simulation key control module, and an interlocking logic module, it effectively controls the rotation of the simulation key in the circular keyhole, avoiding accidental rotation of the simulation key in the circular keyhole and thus preventing errors in the electrical five-proof interlocking operation.

[0020] 2. In the electrical five-proof interlocking operation simulation training device provided by the present invention, the lock cylinder number, key ID number and interlocking logic module are all editable and configurable, and can automatically change according to the actual operation information, which is suitable for training on the operation of various electrical five-proof interlocking keys.

[0021] 3. By combining multiple simulation training devices for electrical five-proof interlocking operation provided by this invention, all electrical five-proof interlocking key operations can be satisfied. Attached Figure Description

[0022] Figure 1 A schematic diagram of the assembly structure of the interlocking key simulator in the electrical five-prevention interlocking operation simulation training device provided by the present invention;

[0023] Figure 2 A schematic diagram of the simulated key structure in a simulated training device for electrical five-proof interlocking operation provided by the present invention;

[0024] Figure 3 A schematic diagram of the internal limit sensor structure of the simulator shell in a simulation training device for electrical five-proof interlocking operation provided by the present invention.

[0025] Figure 4 A schematic diagram of the inner positioning structure of the simulator shell in a simulation training device for electrical five-prevention interlocking operation provided by the present invention;

[0026] Figure 5 A schematic diagram of the simulated key lock block sliding control structure in a simulated training device for electrical five-proof interlocking operation provided by the present invention;

[0027] Figure 6 A schematic diagram of the key rotation position detection structure in a simulation training device for electrical five-proof interlocking operation provided by the present invention;

[0028] Figure 7 A schematic diagram of the key insertion detection structure in a simulation training device for electrical five-prevention interlocking operation provided by the present invention;

[0029] Figure 8 This is a schematic diagram of the simulated key tag structure in a simulated training device for electrical five-proof interlocking operation provided by the present invention;

[0030] Figure 9 The present invention provides an operation flowchart for a simulation training device for electrical five-prevention interlocking operation.

[0031] In the diagram: 1. Interlocking key simulator; 2. Simulated key; 3. Simulator faceplate; 4. Circular keyhole; 5. Key tooth guide groove; 6. Key headphone jack; 7. Micro switch; 8. DC screw geared motor; 9. Motor bracket; 10. Key rotation stop; 11. Key rotation stop bow-shaped structure; 12. Tumbler; 13. Circular keyhole base; 14. Limit sensor; 15. Key columnar teeth; 16. Trapezoidal protrusion structure; 17. Key headphone plug; 18. Tumbler locking point; 19. Simulated key tag; 20. E-ink screen; 21. Communication cable. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0033] like Figure 1-7 As shown, the present invention provides a simulation training device for electrical five-proof interlocking operation, including an interlocking key simulator 1, a simulation key 2, a simulation key detection module, a simulation key control module, and an interlocking logic module.

[0034] The interlocking key simulator 1 has a combined cube or cuboid structure. A circular keyhole 4 is provided at the bottom of the simulator shell 3 at the bottom of the interlocking key simulator 1. A raised key tooth guide groove 5 is provided above the arc of the circular keyhole 4. A ring-shaped cylindrical key earphone jack 6 is provided in the middle of the circular keyhole 4. A spring is embedded in the key earphone jack 6 that protrudes from the hole position.

[0035] The simulated key 2 has a cylindrical front end and a flat, fan-shaped rear end. The cylindrical front end of the simulated key 2 has key-shaped teeth 15 along its outer circumference, which match the key-tooth guide groove 5. Preferably, the key-shaped teeth 15 are positioned above the outer arc of the cylindrical front end of the simulated key 2 and in the flat direction of the flat, fan-shaped rear end. A columnar key headphone plug 17 is located in the middle of the cylindrical front end of the simulated key 2. The key headphone plug 17 matches the key headphone jack 6. When the key headphone plug 17 contacts the key headphone jack 6, the key ID number is transmitted to the key headphone jack 6 through the key headphone plug 17. Both the lock cylinder number and the key ID number are editable and configurable.

[0036] The simulated key detection module and the simulated key control module are located inside the circular keyhole 4. The simulated key detection module is used to detect the insertion state or rotation position of the simulated key 2. The simulated key control module is used to open or close the channel of the key-restricting columnar key teeth 15; when the channel of the key-restricting columnar key teeth 15 is open, the simulated key 2 is allowed to rotate within the circular keyhole 4; when the channel of the key-restricting columnar key teeth 15 is closed, the simulated key 2 is prohibited from rotating within the circular keyhole 4.

[0037] The interlocking logic module is used to generate a simulated key control command based on the key ID number, the insertion state of the simulated key 2, or the rotation position of the simulated key 2, and to control the simulated key control module to open or close the channel of the limiting key column teeth 15 according to the control command.

[0038] In one specific embodiment, the simulated key detection module, the interlocking logic module, and the simulated key control module are connected in sequence. The simulated key detection module detects the insertion status of the simulated key 2 and sends the insertion status to the interlocking logic module. The interlocking logic module reads the key ID number, determines whether the simulated key 2 meets the authorization requirements, generates simulated key control commands (including unlocking and locking commands) based on the determination result, and sends the simulated key control commands to the simulated key control module. The simulated key control module opens or closes the channel of the limiting key column teeth 15 according to the simulated key control commands, allowing or prohibiting the simulated key 2 from rotating in the circular keyhole 4.

[0039] In another specific embodiment, the simulated key detection module, the interlocking logic module, and the simulated key control module are connected in sequence. The simulated key detection module detects the insertion state or rotation position of the simulated key 2 and sends the insertion state or rotation position to the interlocking logic module. The interlocking logic module generates simulated key control commands (including unlocking commands and locking commands) based on the insertion state or rotation position of the simulated key 2 and sends the simulated key control commands to the simulated key control module. The simulated key control module opens or closes the channel of the limiting key column teeth 15 according to the simulated key control commands, allowing or prohibiting the simulated key 2 from rotating in the circular keyhole 4.

[0040] The simulated key detection module includes microswitches 7 and trapezoidal protrusions 16. Two microswitches 7 are spaced apart along the circumference inside the circular keyhole 4. Preferably, the two microswitches 7 form a 90-degree angle along the circumference. The front cylindrical structure of the simulated key 2 has trapezoidal protrusions 16 along its outer circumference, which match the microswitches 7. Preferably, the trapezoidal protrusions 16 are located below the outer arc of the front cylindrical structure of the simulated key 2 and in the flat direction of the rear flat fan-shaped structure. The microswitches 7 are activated by pressing the trapezoidal protrusions 16, detecting the insertion or rotation of the simulated key 2.

[0041] The simulated key control module includes a circular keyhole base 13, a motor bracket 9, a DC screw geared motor 8, a key rotation stop 10, and a key rotation stop arc-shaped structure 11. The circular keyhole base 13 is located inside the circular keyhole 4 at the bottom of the simulator faceplate 3. The circular keyhole base 13 has an arc-shaped limiting step and fixing holes for fixing the key sensor PCB board and the motor bracket 9. The motor bracket 9 is a frame-shaped triangular body. A DC screw reducer motor 8 is mounted on the motor bracket 9. The screw of the DC screw reducer motor 8 is connected to the key rotating block 10 through the screw hole of the key rotating block 10. The forward or reverse rotation of the DC screw reducer motor 8 can drive the key rotating block 10 to rise and fall through the screw. The bow-shaped structure 11 of the key rotating block is connected to the key rotating block 10. When the key rotating block 10 is raised, the bow-shaped structure 11 of the key rotating block is raised accordingly. At this time, the channel of the key column-shaped key teeth 15 is restricted to open, allowing the simulated key 2 to rotate in the circular keyhole 4. When the key rotating block 10 is lowered, the bow-shaped structure 11 of the key rotating block is lowered accordingly. At this time, the channel of the key column-shaped key teeth 15 is closed, preventing the simulated key 2 from rotating in the circular keyhole 4.

[0042] The analog key control module also includes a limit sensor 14, which is mounted on the key sensor PCB board and is used to sense when the key rotation stop 10 is raised and lowered.

[0043] The device of the present invention also includes a ball 12 and a ball locking point 18. A ball 12 is provided circumferentially inside the circular keyhole 4. Preferably, the ball 12 is located inside the circular keyhole 4 at a 45-degree angle to the lower part of its arcuate side. Two hemispherical, inwardly recessed ball locking points 18 are spaced apart along the outer circumference of the cylindrical structure at the front end of the simulated key 2, and these ball locking points 18 match the ball 12. Preferably, the two ball locking points 18 are located at a 45-degree angle to the lower part of the arcuate side of the cylindrical structure at the front end of the simulated key 2. The ball 12's recess into the ball locking point 18 indicates that the simulated key 2 has rotated into position within the circular keyhole 4.

[0044] During the clockwise or counterclockwise rotation of the simulated key 2, when the ball stop 18 reaches the position where the ball 12 is located inside the circular keyhole 4 at a 45-degree angle to the side of the arc and the bottom, the ball 12 is recessed into the ball stop 18 as it moves, making a "click" sound. The rotation causes a stop, thus providing a good feel of rotating into place.

[0045] like Figure 8 As shown, the device of the present invention also includes a simulated key tag 19, which is disposed on the simulated key 2 and is used to display information such as the key ID number and simulated key control commands. Preferably, the simulated key tag 19 is an electronic ink screen 20.

[0046] The simulated key tag 19 is equipped with a communication cable 21. When the simulated key 2 is inserted into the circular keyhole 4, the key headphone plug 17 of the interlocking key simulator 1 supplies power to the simulated key tag 19 through the communication cable 21, and can update the display content on the simulated key tag 19 according to the simulated key control commands generated by the interlocking logic module. After the simulated key 2 is removed, the content displayed on the simulated key tag 19 does not disappear.

[0047] The present invention provides a simulation training device for the operation of electrical five-proof interlocking, which is used for simulation training of electrical five-proof interlocking operation, as follows:

[0048] like Figure 9As shown, when the interlocking key simulator 1 is authorized to unlock, the key pin 15 at the front end of the simulated key 2 is aligned with the raised key pin guide groove 5 above the arc of the circular key socket 4 at the bottom of the simulator housing 3 and inserted into the circular key socket 4. As the key 2 is inserted, the key headphone plug 17 in the middle of the cylindrical front end of the key contacts the annular cylindrical key headphone jack 6, supplying power to the simulated key tag 19 while also transmitting the key ID number. As the simulated key 2 is inserted, the trapezoidal protrusion 16 on the lower front and the flat fan-shaped rear end of the cylindrical outer arc of the simulated key 2 presses open the micro switch 7 at the bottom so that the interlocking key simulator 1 can detect the key insertion status. If the interlocking key simulator 1 detects the key insertion, it sends a status notification to the host computer interlocking logic module. The host computer interlocking logic module sends a command to read the key ID number and determine whether the authorization requirements are met. If the authorization requirements are met... When the right requires, the DC screw reducer motor 8 rotates in the forward direction and drives the key rotation stop 10 to lift. The bow-shaped structure 11 of the key rotation stop also lifts, thus restricting the channel of the key columnar teeth 15 from opening and allowing the simulated key 2 to rotate. At this time, the key can rotate 90 degrees clockwise. The trapezoidal protrusion structure 16, which is set in the direction of the lower front of the cylindrical outer arc of the simulated key 2 and the flat fan-shaped structure at the rear, squeezes and opens the micro switch 7 on the side so that the interlocking key simulator 1 can detect the state of the key after rotation. After the interlocking key simulator 1 detects that the key has rotated to the corresponding position, it sends the current position status to the host computer interlocking logic module. The host computer interlocking logic module sends a command to the interlocking key simulator 1 to lock, then the DC screw reducer motor 8 rotates in the reverse direction and drives the key rotation stop 10 to fall. The bow-shaped structure 11 of the key rotation stop also falls, thus restricting the channel of the key columnar teeth 15 from closing and preventing the key from rotating back.

[0049] like Figure 9As shown, when the interlocking key simulator 1 is authorized to lock, the host computer interlocking logic module sends a command to the interlocking key simulator 1 to unlock. The DC screw reducer motor 8 then rotates forward, driving the key rotation stop 10 to lift. The bow-shaped structure 11 of the key rotation stop also lifts, opening the channel of the key's columnar teeth 15 and allowing the simulated key 2 to rotate. At this time, the key can rotate 90 degrees counterclockwise back to its origin. The trapezoidal protrusions 11, located below the lower front of the cylindrical outer arc of the simulated key 2 and in the flat, fan-shaped rear end, are positioned in a flat direction. 6. The microswitch 7 on the side is closed so that the interlocking key simulator 1 can detect the state after the key is rotated. After the interlocking key simulator 1 detects that the key has rotated back to the original position, it sends the current position status to the host computer interlocking logic module. The key is pulled out. The trapezoidal protrusion structure 16 of the front cylindrical outer arc of the simulated key 2, which is set in the direction of the lower front and the rear flat fan-shaped flat structure, is closed. The microswitch 7 on the bottom is closed so that the interlocking key simulator 1 can detect the state after the key is pulled out. The interlocking key simulator 1 reports the key pulling action to the host computer interlocking logic module.

[0050] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. All contents not described in detail in the present invention can be derived from existing technologies.

Claims

1. A simulation training device for the operation of electrical five-prevention interlocking systems, characterized in that, The device includes an interlocking key simulator (1), a simulated key (2), a simulated key detection module, a simulated key control module, and an interlocking logic module; The interlocking key simulator (1) has a simulator faceplate (3) at the bottom. A circular keyhole (4) is provided at the bottom of the simulator faceplate (3). A raised key tooth guide groove (5) is provided on the circular keyhole (4). A ring-shaped cylindrical key earphone jack (6) is provided in the middle of the circular keyhole (4). The front end of the simulated key (2) is a cylindrical structure. The cylindrical structure at the front end of the simulated key (2) is provided with key-shaped teeth (15) along the outer circumference. The key-shaped teeth (15) match the key-shaped guide groove (5). A columnar key headphone plug (17) is provided in the middle of the cylindrical structure at the front end of the simulated key (2). The key headphone plug (17) matches the key headphone jack (6). When the key headphone plug (17) contacts the key headphone jack (6), the key ID number is transmitted to the key headphone jack (6) through the key headphone plug (17). The simulated key detection module and the simulated key control module are located inside the circular keyhole (4); the simulated key detection module is used to detect the insertion state or rotation position of the simulated key (2); The analog key control module is used to open or close the channel of the limiting key tooth (15); when the channel of the limiting key tooth (15) is open, the analog key (2) is allowed to rotate in the circular key socket (4); when the channel of the limiting key tooth (15) is closed, the analog key (2) is prohibited from rotating in the circular key socket (4); The interlocking logic module is used to generate a simulated key control command based on the key ID number or the insertion state of the simulated key (2) or the rotation position of the simulated key (2), and to control the simulated key control module to open or close the channel of the limiting key column teeth (15). The analog key control module includes a circular keyhole base (13), a motor bracket (9), a DC screw reducer motor (8), a key rotation stop (10), and a key rotation stop arc-shaped structure (11). The circular keyhole (4) has a circular keyhole base (13) inside, which has an arc-shaped limiting step and fixing holes. The fixing holes are used to fix the key sensor PCB board and the motor bracket (9). The motor bracket (9) has a DC screw reducer motor (8), whose screw is connected to the key rotation stop (10) through a screw hole. The high-speed motor (8) can rotate forward or backward by driving the key rotation stop (10) to rise and fall via the screw. The key rotation stop bow-shaped structure (11) is connected to the key rotation stop (10). When the key rotation stop (10) is raised, the key rotation stop bow-shaped structure (11) is raised accordingly. At this time, the channel of the key column teeth (15) is opened, allowing the simulated key (2) to rotate in the circular keyhole (4). When the key rotation stop (10) is lowered, the key rotation stop bow-shaped structure (11) is lowered accordingly. At this time, the channel of the key column teeth (15) is closed, preventing the simulated key (2) from rotating in the circular keyhole (4).

2. The simulation training device for electrical five-proof interlocking operation according to claim 1, characterized in that, The simulated key detection module includes a micro switch (7) and a trapezoidal protrusion structure (16); two micro switches (7) are spaced apart along the circumference inside the circular keyhole (4); the cylindrical structure at the front end of the simulated key (2) has a trapezoidal protrusion structure (16) along the outer circumference, and the trapezoidal protrusion structure (16) matches the micro switch (7); the micro switch (7) is opened by squeezing the trapezoidal protrusion structure (16) to detect the insertion state or rotation position of the simulated key (2).

3. The simulation training device for electrical five-prevention interlocking operation according to claim 1, characterized in that, The simulated key control module also includes a limit sensor (14), which is set on the key sensor PCB board and is used to sense the lifting and lowering of the key rotation stop (10).

4. The simulation training device for electrical five-prevention interlocking operation according to claim 1, characterized in that, The device also includes a marble (12) and a marble locking point (18); the inside of the circular keyhole (4) is provided with a marble (12) along the circumferential direction; the cylindrical structure at the front end of the simulated key (2) is provided with two hemispherical inwardly recessed marble locking points (18) at intervals along the outer circumference, and the marble locking points (18) match the marble (12); by the marble (12) being recessed into the marble locking point (18), the simulated key (2) is instructed to rotate into place in the circular keyhole (4).

5. The simulation training device for electrical five-prevention interlocking operation according to claim 1, characterized in that, The device also includes a simulated key tag (19), which is set on the simulated key (2) and is used to display the key ID number and simulated key control command information.

6. The simulation training device for electrical five-proof interlocking operation according to claim 5, characterized in that, The simulated key tag (19) is equipped with a communication cable (21). When the simulated key (2) is inserted into the circular key socket (4), the key headphone plug (17) of the interlocking key simulator (1) supplies power to the simulated key tag (19) through the communication cable (21) and can update the display content on the simulated key tag (19) according to the simulated key control command generated by the interlocking logic module. After the simulated key (2) is pulled out, the content displayed on the simulated key tag (19) does not disappear.

7. The simulation training device for electrical five-proof interlocking operation according to claim 5, characterized in that, The simulated key tag (19) is an electronic ink screen (20).

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