A low-voltage cabinet door lock protection structure

Abstract

The present invention relates to the technical field of locks, and specifically to a low-voltage cabinet door lock protection structure, comprising a lock body and a key; the lock body comprises a lock core, a lock tongue and an identification switch of a normally closed switch, the lock core comprises a first conductive rotating shaft, a second conductive rotating shaft and an insulating sealing sleeve; one end of the first conductive rotating shaft is inserted into the sealing sleeve and is grounded, and the second conductive rotating shaft is inserted from the other end of the sealing sleeve; ER fluid is present between the first insertion part and the second insertion part; the key comprises a battery, a memory and a conductive connector, the memory is electrically connected to the battery and the conductive connector respectively, and the memory stores an activation electrical signal of the identification switch; the present invention forms a potential difference between the first conductive shaft and the second conductive shaft by disconnecting the battery in conjunction with the identification switch and the ER fluid is an insulator, and the potential difference forms an electric field. Under the action of the electric field, the ER fluid forms a connection between the first insertion part and the second insertion part, so that locking and unlocking can be achieved by twisting the identification part.

Description

Technical Field

[0001] The present invention relates to the technical field of locks, and in particular to a low-voltage cabinet door lock protection structure. Background Art

[0002] As we all know, low-voltage switchgear is suitable for power plants, petroleum, chemical, metallurgy, textile, high-rise buildings and other industries for power transmission, distribution and power conversion.

[0003] Existing low-voltage cabinet door locks lack external protective devices during use. The keyhole easily rusts when exposed to water, making it difficult to open the door lock. The keyhole is exposed to the outside world, causing excessive dust to accumulate inside. This can affect the lock's proper operation over time. To avoid this problem, existing technologies often install covers on the keyholes to prevent dust, rain, and other debris from entering. However, this approach overlooks the fact that the key used to unlock the door is constantly exposed to the outside world. When the key engages the lock cylinder, the lubricating oil on the cylinder absorbs dust and other debris carried by the key. Furthermore, the cylinder's complex internal structure can easily become blocked by even the slightest bit of dust over time. Furthermore, each lock is assigned a key. During inspections, staff members need to carry a large set of keys and inspect each electrical cabinet individually, which is very inconvenient. Furthermore, since all keys look the same, they require special markings, which easily wear out and make unlocking difficult. Therefore, there is a need for a low-voltage cabinet door lock protective structure that facilitates unlocking, prevents contamination within the lock cylinder, and simplifies the internal structure of the lock cylinder. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a low-voltage cabinet door lock protection structure which can facilitate unlocking, avoid contamination of the interior of the lock core, and simplify the internal structure of the lock core.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A low-voltage cabinet door lock protection structure is provided on a cabinet door of a low-voltage cabinet, the cabinet door is grounded, and the low-voltage cabinet door lock protection structure includes a lock body and a key;

[0007] The lock body includes a lock core, a lock tongue and an identification switch, and the lock core includes a first conductive rotating shaft, a second conductive rotating shaft and an insulating sealing sleeve;

[0008] The first conductive rotating shaft includes a first insertion portion and a connecting portion, wherein the first insertion portion is inserted into the sealing sleeve from one end thereof and is rotated and sealed, and the connecting portion is fixedly connected to the lock tongue and electrically connected to the cabinet door; the second conductive rotating shaft includes a second insertion portion and an identification portion, wherein the second insertion portion is inserted into the sealing sleeve from the other end thereof and is rotated and sealed; a gap is defined between the first insertion portion and the second insertion portion, and the gap in the sealing sleeve is filled with ER fluid; the identification switch is electrically connected to the connecting portion and the identification portion, respectively, and the identification switch is a normally closed switch;

[0009] The key includes a battery, a memory and a conductive connector. The memory is electrically connected to the battery and the conductive connector respectively, and the memory stores an activation electrical signal of the identification switch. When the key unlocks the lock body, the conductive connector contacts the second conductive rotating shaft, and the memory sends an activation electrical signal to the identification switch through the conductive connector and the second conductive rotating shaft. The identification switch performs identification. If it is correct, the identification switch is in a disconnected state. At the same time, the battery transmits positive charge to the second conductive rotating shaft through the conductive connector to form a potential difference. The ER fluid connects the first conductive rotating shaft and the second conductive rotating shaft under the action of the electric field, and the second conductive rotating shaft is rotated to realize the rotation of the lock tongue.

[0010] Preferably, the lock body further comprises a mounting sleeve, a locking sleeve, a front panel and a metal washer;

[0011] The mounting sleeve is fixedly mounted on the outer periphery of the sealing sleeve; a threaded groove is also provided on the outer periphery of the mounting sleeve;

[0012] The front panel is provided with a through hole for the identification portion to pass through, and the front panel is connected to one end of the mounting sleeve facing the identification portion;

[0013] The locking sleeve is sleeved on the outer periphery of the mounting sleeve and the inner wall of the locking sleeve is provided with a thread that matches the thread groove, and the metal washer is sleeved on the outer periphery of the mounting sleeve;

[0014] The cabinet door is provided with a mounting hole for installing the mounting sleeve. The mounting sleeve is located in the mounting hole and is installed from the outside to the inside of the low-voltage cabinet in the order of the front panel, cabinet door, metal gasket, and locking sleeve, and the locking sleeve is locked to complete the fixation.

[0015] Preferably, there are flexible gaskets between the cabinet door and the front panel and the metal gasket respectively.

[0016] Preferably, the key is one or more of a mobile phone, a smart watch or a handheld computer.

[0017] Preferably, the front panel is embedded with an NFC chip;

[0018] The mobile phone, smart watch or handheld computer is provided with an identifier for identifying the NFC chip.

[0019] Preferably, the low-voltage cabinet door lock protection structure further includes a cloud;

[0020] The activation electrical signal of the identification switch stored in the memory is sent from the cloud and then stored locally.

[0021] Preferably, the outer circumference of the locking sleeve is hexagonal.

[0022] Preferably, a gripping portion is provided on the identification portion, and an identification groove that cooperates with the conductive connector is provided on the gripping portion.

[0023] Preferably, the gripping portion is a cylinder with a waist-shaped cross section.

[0024] Preferably, the identification groove is a circular groove, and the conductive connector is a cylinder.

[0025] The beneficial effects of the present invention are as follows: through the identification switch of the first conductive rotating shaft, the second conductive rotating shaft and the normally closed switch, in conjunction with the key and the grounded cabinet door, the cabinet door is electrically connected to the first conductive shaft. Since it is a normally closed switch, the first conductive shaft and the second conductive shaft have the same potential in the natural state, no electric field is generated, and the ER fluid is not affected; after identification, since the identification switch is disconnected and the ER fluid is an insulator, a potential difference is formed between the first conductive shaft and the second conductive shaft, and the potential difference forms an electric field. Under the action of the electric field, the ER particles in the ER fluid form an ER particle beam, thereby The viscosity increases sharply, forming a connection or soft connection between the first insertion part and the second insertion part, so that by twisting the identification part, the connection part can be driven to rotate, and then the lock core can be driven to rotate to achieve locking and unlocking; and through the design of the conductive connector and the identification part, the key does not need to be inserted into the lock core. Therefore, the lock core is in a permanently closed state, and no additional power supply is required to achieve locking. The switch requires a key to avoid accidents where the key is left in the electrical cabinet. At the same time, one key can be adapted to theoretically unlimited lock bodies, which can reduce the burden on patrol staff and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural schematic diagram of a low-voltage cabinet door lock protection structure according to a specific embodiment of the present invention;

[0027] Figure 2 This is a structural schematic diagram of a lock body of a low-voltage cabinet door lock protection structure according to a specific embodiment of the present invention;

[0028] Figure 3 A partial cross-sectional schematic diagram of a lock body of a low-voltage cabinet door lock protection structure according to a specific embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the closed state of the identification switch of the lock body of a low-voltage cabinet door lock protection structure according to a specific embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of a lock body identification switch disconnected state of a low-voltage cabinet door lock protection structure according to a specific embodiment of the present invention;

[0031] Explanation of the numbers: 1. Lock body; 11. Lock core; 12. Lock tongue; 13. Identification switch; 14. First conductive shaft; 141. First insertion part; 142. Connecting part; 15. Second conductive shaft; 151. Second insertion part; 152. Identification part; 153. Gripping part; 154. Identification groove; 16. Sealing sleeve; 161. Spacer; 17. Mounting sleeve; 18. Locking sleeve; 19. Front panel; 110. Metal washer; 2. Key; 21. Conductive connector. DETAILED DESCRIPTION

[0032] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0033] Please refer to Figures 1 to 5 A low-voltage cabinet door lock protection structure is provided on the cabinet door of the low-voltage cabinet, the cabinet door is grounded, and the low-voltage cabinet door lock protection structure includes a lock body 1 and a key 2;

[0034] The lock body 1 includes a lock core 11, a lock tongue 12 and an identification switch 13. The lock core 11 includes a first conductive rotating shaft 14, a second conductive rotating shaft 15 and an insulating sealing sleeve 16.

[0035] The first conductive rotating shaft 14 includes a first inserting portion 141 and a connecting portion 142. The first inserting portion 141 is inserted into the sealing sleeve 16 from one end and rotates to form a sealed connection. The connecting portion 142 is fixedly connected to the lock tongue 12 and electrically connected to the cabinet door. The second conductive rotating shaft 15 includes a second inserting portion 151 and an identification portion 152. The second inserting portion 151 is inserted into the sealing sleeve 16 from the other end and rotates to form a sealed connection. A gap 161 is defined between the first inserting portion 141 and the second inserting portion 151. The gap 161 of the sealing sleeve 16 is filled with ER fluid. The identification switch 13 is electrically connected to the connecting portion 142 and the identification portion 152, respectively, and the identification switch 13 is a normally closed switch.

[0036] The key 2 includes a battery, a memory and a conductive connector 21. The memory is electrically connected to the battery and the conductive connector 21 respectively, and the activation electrical signal of the identification switch 13 is stored in the memory. When the key 2 unlocks the lock body 1, the conductive connector 21 contacts the second conductive rotating shaft 15. The memory sends an activation electrical signal to the identification switch 13 through the conductive connector 21 and the second conductive rotating shaft 15. The identification switch 13 identifies the key. If the key is correct, the identification switch 13 is in the disconnected state. At the same time, the battery transmits positive charge to the second conductive rotating shaft 15 through the conductive connector 21 to form a potential difference. Under the action of the electric field, the ER fluid connects the first conductive rotating shaft 14 and the second conductive rotating shaft 15, rotating the second conductive rotating shaft 15 to realize the rotation of the lock tongue 12.

[0037] As can be seen from the above description, through the first conductive shaft 14, the second conductive shaft 15 and the identification switch 13 of the normally closed switch, in conjunction with the key 2 and the grounded cabinet door, the cabinet door is electrically connected to the first conductive shaft. Since it is a normally closed switch, the potential of the first conductive shaft and the second conductive shaft are the same in the natural state, no electric field is generated, and the ER fluid is not affected; after identification, since the identification switch 13 is disconnected and the ER fluid is an insulator, a potential difference is formed between the first conductive shaft and the second conductive shaft, and the potential difference forms an electric field. Under the action of the electric field, the ER particles in the ER fluid form an ER particle beam, and the viscosity of the ER fluid increases sharply, forming the first conductive shaft. The connection or soft connection between the insertion part 141 and the second insertion part 151 allows the connection part 142 to be driven to rotate by twisting the identification part 152, thereby driving the lock cylinder 11 to rotate, thereby achieving locking and unlocking; and through the design of the conductive connector 21 and the identification part 152, the key 2 does not need to be inserted into the lock cylinder 11, so the lock cylinder 11 is in a permanently closed state, and no additional power supply is required to achieve locking. The key 2 is required for both the switch to avoid accidents in which the key 2 is left in the electrical cabinet. At the same time, one key 2 can be adapted to theoretically unlimited lock bodies 1, which can reduce the burden on patrol staff and improve work efficiency.

[0038] Electrorheological (ER) fluids: Electrorheological (ER) fluids are one of the materials chosen for use as regulating actuators in intelligent material systems. ER fluids are colloidal suspension systems whose overall properties are controlled by an external voltage applied to the fluid system. Under the influence of an electric field, the viscosity of ER fluids changes from Newtonian fluids to Bingham fluids. In the absence of an electric field, ER fluids flow like conventional particle dispersions. When an electric field is applied, the ER particles in the ER fluid are polarized by the electric field, and the opposite polarities between the particles attract each other, forming a particle beam along the direction of the electric field. This particle beam creates flow resistance and increases viscosity. When the viscosity is high enough, it can exhibit a solid state or a state with extremely high viscosity. When the viscosity is high enough, it can exhibit a solid or solid-like state. The viscosity can be used to create a friction transmission effect between the first conductive shaft 14 and the second conductive shaft 15, thereby achieving transmission.

[0039] Furthermore, the lock body 1 further comprises a mounting sleeve 17, a locking sleeve 18, a front panel 19 and a metal washer 110;

[0040] The mounting sleeve 17 is fixedly mounted on the outer periphery of the sealing sleeve 16; a threaded groove is also provided on the outer periphery of the mounting sleeve 17;

[0041] The front panel 19 is provided with a through hole for the identification portion 152 to pass through, and the front panel 19 is connected to one end of the mounting sleeve 17 facing the identification portion 152;

[0042] The locking sleeve 18 is sleeved on the outer periphery of the mounting sleeve 17 and the inner wall of the locking sleeve 18 is provided with a thread that matches the thread groove. The metal washer 110 is sleeved on the outer periphery of the mounting sleeve 17.

[0043] The cabinet door is provided with a mounting hole for installing the mounting sleeve 17. The mounting sleeve 17 is located in the mounting hole and is installed from the outside to the inside of the low-voltage cabinet in the order of the front panel 19, cabinet door, metal gasket 110, and locking sleeve 18. At the same time, the locking sleeve 18 is locked to complete the fixation.

[0044] As can be seen from the above description, the cabinet door is clamped and fixed by utilizing the front door panel and the locking sleeve 18 , which has a simple structure and does not damage the existing cabinet door design.

[0045] Furthermore, flexible gaskets are provided between the cabinet door and the front panel 19 and the metal gasket 110 .

[0046] It can be seen from the above description that the flexible gasket can reduce friction, avoid deformation of the door panel and achieve sealing.

[0047] Furthermore, the key 2 is one or more of a mobile phone, a smart watch or a handheld computer.

[0048] From the above description, it can be seen that it can be conveniently used through one of the existing mobile phones, smart watches or tablets (handheld computers), especially watches, which can further free up hands and do not take up space.

[0049] Furthermore, the front panel 19 is embedded with an NFC chip;

[0050] The mobile phone, smart watch or handheld computer is provided with an identifier for identifying the NFC chip.

[0051] From the above description, it can be seen that the information of the lock cylinder 11 can be stored through the embedded NFC chip. After the mobile phone, smart watch or handheld computer is identified by the identifier, the corresponding lock cylinder 11 information can be found from the memory in the uploaded database, and then the activation electrical signal is sent to the identification switch 13 through the conductive connector 21 and the second conductive shaft 15, thereby improving the unlocking efficiency.

[0052] Furthermore, the low-voltage cabinet door lock protection structure also includes a cloud;

[0053] The activation electric signal of the identification switch 13 stored in the memory is sent from the cloud and then stored locally.

[0054] Furthermore, the outer circumference of the locking sleeve 18 is hexagonal.

[0055] From the above description, it can be seen that the hexagonal outer circumference can be conveniently tightened with a wrench, thereby improving efficiency.

[0056] Furthermore, a gripping portion 153 is provided on the identification portion 152 , and an identification groove 154 that cooperates with the conductive connector 21 is provided on the gripping portion 153 .

[0057] As can be seen from the above description, the gripping portion 153 can be used to conveniently rotate the second conductive shaft 153 by a person's hand, just like opening a door.

[0058] Furthermore, the gripping portion 153 is a column with a rounded cross section.

[0059] From the above description, it can be seen that since it is not a cylinder, it is easier for the fingers to turn it.

[0060] Furthermore, the identification groove 154 is a circular groove, and the conductive connector 21 is a cylinder. Example 1

[0061] A low-voltage cabinet door lock protection structure is provided on a cabinet door of a low-voltage cabinet, the cabinet door is grounded, and the low-voltage cabinet door lock protection structure comprises a lock body 1 and a key 2;

[0062] The lock body 1 includes a lock core 11, a lock tongue 12 and an identification switch 13. The lock core 11 includes a first conductive rotating shaft 14, a second conductive rotating shaft 15 and an insulating sealing sleeve 16.

[0063] The first conductive rotating shaft 14 includes a first inserting portion 141 and a connecting portion 142. The first inserting portion 141 is inserted into the sealing sleeve 16 from one end and rotates to form a sealed connection. The connecting portion 142 is fixedly connected to the lock tongue 12 and electrically connected to the cabinet door. The second conductive rotating shaft 15 includes a second inserting portion 151 and an identification portion 152. The second inserting portion 151 is inserted into the sealing sleeve 16 from the other end and rotates to form a sealed connection. A gap 161 is defined between the first inserting portion 141 and the second inserting portion 151. The gap 161 of the sealing sleeve 16 is filled with ER fluid. The identification switch 13 is electrically connected to the connecting portion 142 and the identification portion 152, respectively, and the identification switch 13 is a normally closed switch.

[0064] The key 2 includes a battery, a memory and a conductive connector 21. The memory is electrically connected to the battery and the conductive connector 21 respectively, and the activation electrical signal of the identification switch 13 is stored in the memory. When the key 2 unlocks the lock body 1, the conductive connector 21 contacts the second conductive rotating shaft 15. The memory sends an activation electrical signal to the identification switch 13 through the conductive connector 21 and the second conductive rotating shaft 15. The identification switch 13 identifies the key. If the key is correct, the identification switch 13 is in the disconnected state. At the same time, the battery transmits positive charge to the second conductive rotating shaft 15 through the conductive connector 21 to form a potential difference. Under the action of the electric field, the ER fluid connects the first conductive rotating shaft 14 and the second conductive rotating shaft 15, rotating the second conductive rotating shaft 15 to realize the rotation of the lock tongue 12.

[0065] The lock body 1 further comprises a mounting sleeve 17, a locking sleeve 18, a front panel 19 and a metal washer 110;

[0066] The mounting sleeve 17 is fixedly mounted on the outer periphery of the sealing sleeve 16; a threaded groove is also provided on the outer periphery of the mounting sleeve 17;

[0067] The front panel 19 is provided with a through hole for the identification portion 152 to pass through, and the front panel 19 is connected to one end of the mounting sleeve 17 facing the identification portion 152;

[0068] The locking sleeve 18 is sleeved on the outer periphery of the mounting sleeve 17 and the inner wall of the locking sleeve 18 is provided with a thread that matches the thread groove. The metal washer 110 is sleeved on the outer periphery of the mounting sleeve 17.

[0069] The cabinet door is provided with a mounting hole for installing the mounting sleeve 17. The mounting sleeve 17 is located in the mounting hole and is installed from the outside to the inside of the low-voltage cabinet in the order of the front panel 19, cabinet door, metal gasket 110, and locking sleeve 18. At the same time, the locking sleeve 18 is locked to complete the fixation.

[0070] There are flexible gaskets between the cabinet door and the front panel 19 and the metal gasket 110 respectively.

[0071] The key 2 is one or more of a mobile phone, a smart watch or a handheld computer.

[0072] The front panel 19 is embedded with an NFC chip;

[0073] The mobile phone, smart watch or handheld computer is provided with an identifier for identifying the NFC chip.

[0074] The low-voltage cabinet door lock protection structure also includes a cloud;

[0075] The activation electric signal of the identification switch 13 stored in the memory is sent from the cloud and then stored locally.

[0076] The outer circumference of the locking sleeve 18 is hexagonal.

[0077] The identification portion 152 is provided with a gripping portion 153 , and the gripping portion 153 is provided with an identification slot 154 that cooperates with the conductive connector 21 .

[0078] The gripping portion 153 is a cylindrical body with a round cross section.

[0079] The identification groove 154 is a circular groove, and the conductive connector 21 is a cylinder. Example 2

[0080] A low-voltage cabinet door lock protection structure is provided on a cabinet door of a low-voltage cabinet, the cabinet door is grounded, and the low-voltage cabinet door lock protection structure comprises a lock body 1 and a key 2;

[0081] The lock body 1 includes a lock core 11, a lock tongue 12 and an identification switch 13. The lock core 11 includes a first conductive rotating shaft 14, a second conductive rotating shaft 15 and an insulating sealing sleeve 16.

[0082] The first conductive rotating shaft 14 includes a first inserting portion 141 and a connecting portion 142. The first inserting portion 141 is inserted into the sealing sleeve 16 from one end and rotates to form a sealed connection. The connecting portion 142 is fixedly connected to the lock tongue 12 and electrically connected to the cabinet door. The second conductive rotating shaft 15 includes a second inserting portion 151 and an identification portion 152. The second inserting portion 151 is inserted into the sealing sleeve 16 from the other end and rotates to form a sealed connection. A gap 161 is defined between the first inserting portion 141 and the second inserting portion 151. The gap 161 of the sealing sleeve 16 is filled with ER fluid. The identification switch 13 is electrically connected to the connecting portion 142 and the identification portion 152, respectively, and the identification switch 13 is a normally closed switch.

[0083] The key 2 includes a battery, a memory and a conductive connector 21. The memory is electrically connected to the battery and the conductive connector 21 respectively, and the activation electrical signal of the identification switch 13 is stored in the memory. When the key 2 unlocks the lock body 1, the conductive connector 21 contacts the second conductive rotating shaft 15. The memory sends an activation electrical signal to the identification switch 13 through the conductive connector 21 and the second conductive rotating shaft 15. The identification switch 13 identifies the key. If the key is correct, the identification switch 13 is in the disconnected state. At the same time, the battery transmits positive charge to the second conductive rotating shaft 15 through the conductive connector 21 to form a potential difference. Under the action of the electric field, the ER fluid connects the first conductive rotating shaft 14 and the second conductive rotating shaft 15, rotating the second conductive rotating shaft 15 to realize the rotation of the lock tongue 12.

[0084] The lock body 1 further comprises a mounting sleeve 17, a locking sleeve 18, a front panel 19 and a metal washer 110;

[0085] The mounting sleeve 17 is fixedly mounted on the outer periphery of the sealing sleeve 16; a threaded groove is also provided on the outer periphery of the mounting sleeve 17;

[0086] The front panel 19 is provided with a through hole for the identification portion 152 to pass through, and the front panel 19 is connected to one end of the mounting sleeve 17 facing the identification portion 152;

[0087] The locking sleeve 18 is sleeved on the outer periphery of the mounting sleeve 17 and the inner wall of the locking sleeve 18 is provided with a thread that matches the thread groove. The metal washer 110 is sleeved on the outer periphery of the mounting sleeve 17.

[0088] The cabinet door is provided with a mounting hole for installing the mounting sleeve 17. The mounting sleeve 17 is located in the mounting hole and is installed from the outside to the inside of the low-voltage cabinet in the order of the front panel 19, cabinet door, metal gasket 110, and locking sleeve 18. At the same time, the locking sleeve 18 is locked to complete the fixation.

[0089] There are flexible gaskets between the cabinet door and the front panel 19 and the metal gasket 110 respectively.

[0090] The key 2 is one or more of a mobile phone, a smart watch or a handheld computer.

[0091] The low-voltage cabinet door lock protection structure also includes a cloud;

[0092] The outer circumference of the locking sleeve 18 is hexagonal.

[0093] The identification portion 152 is provided with a gripping portion 153 , and the gripping portion 153 is provided with an identification slot 154 that cooperates with the conductive connector 21 .

[0094] The gripping portion 153 is a cylindrical body with a round cross section.

[0095] The identification groove 154 is a circular groove, and the conductive connector 21 is a cylinder.

[0096] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A low-voltage cabinet door lock protection structure, arranged on the cabinet door of a low-voltage cabinet, wherein the cabinet door is grounded, characterized in that: The low-voltage cabinet door lock protection structure includes a lock body and a key; The lock body includes a lock core, a lock tongue and an identification switch, and the lock core includes a first conductive rotating shaft, a second conductive rotating shaft and an insulating sealing sleeve; The first conductive rotating shaft includes a first insertion portion and a connecting portion. The first insertion portion is inserted into the sealing sleeve from one end and is rotatably sealed with the sealing sleeve. The connecting portion is fixedly connected to the lock tongue and is electrically connected to the cabinet door. The second conductive rotating shaft includes a second insertion portion and an identification portion. The second insertion portion is inserted into the sealing sleeve from the other end and is rotatably sealed with the sealing sleeve. There is a gap between the first insertion portion and the second insertion portion, and the gap in the sealing sleeve is filled with ER fluid. The identification switch is electrically connected to the connecting portion and the identification portion respectively, and the identification switch is a normally closed switch. The key includes a battery, a memory and a conductive connector. The memory is electrically connected to the battery and the conductive connector respectively, and the memory stores an activation electrical signal of the identification switch. When the key unlocks the lock body, the conductive connector contacts the second conductive rotating shaft, and the memory sends an activation electrical signal to the identification switch through the conductive connector and the second conductive rotating shaft. The identification switch performs identification. If it is correct, the identification switch is in a disconnected state. At the same time, the battery transmits positive charge to the second conductive rotating shaft through the conductive connector to form a potential difference. The ER fluid connects the first conductive rotating shaft and the second conductive rotating shaft under the action of the electric field, and the second conductive rotating shaft is rotated to realize the rotation of the lock tongue.

2. The low-voltage cabinet door lock protection structure according to claim 1, characterized in that: The lock body also includes a mounting sleeve, a locking sleeve, a front panel and a metal washer; The mounting sleeve is fixedly mounted on the outer periphery of the sealing sleeve; a threaded groove is also provided on the outer periphery of the mounting sleeve; The front panel is provided with a through hole for the identification portion to pass through, and the front panel is connected to one end of the mounting sleeve facing the identification portion; The locking sleeve is sleeved on the outer periphery of the mounting sleeve and the inner wall of the locking sleeve is provided with a thread that matches the thread groove, and the metal washer is sleeved on the outer periphery of the mounting sleeve; The cabinet door is provided with a mounting hole for installing the mounting sleeve. The mounting sleeve is located in the mounting hole and is installed from the outside to the inside of the low-voltage cabinet in the order of the front panel, cabinet door, metal gasket, and locking sleeve, and the locking sleeve is locked to complete the fixation.

3. The low-voltage cabinet door lock protection structure according to claim 2, characterized in that: Flexible washers are respectively provided between the cabinet door and the front panel and the metal washers.

4. The low-voltage cabinet door lock protection structure according to claim 2, characterized in that: The key is one or more of a mobile phone, a smart watch or a handheld computer.

5. The low-voltage cabinet door lock protection structure according to claim 4, characterized in that: The front panel is embedded with an NFC chip; The mobile phone, smart watch or handheld computer is provided with an identifier for identifying the NFC chip.

6. The low-voltage cabinet door lock protection structure according to claim 2, characterized in that: The low-voltage cabinet door lock protection structure also includes a cloud; The activation electrical signal of the identification switch stored in the memory is sent from the cloud and then stored locally.

7. The low-voltage cabinet door lock protection structure according to claim 2, characterized in that: The outer circumference of the locking sleeve is hexagonal.

8. The low-voltage cabinet door lock protection structure according to claim 1, characterized in that: The identification portion is provided with a holding portion, and the holding portion is provided with an identification groove matched with the conductive connector.

9. The low-voltage cabinet door lock protection structure according to claim 8, characterized in that: The gripping portion is a column with a waist-circular cross section.

10. The low-voltage cabinet door lock protection structure according to claim 8, characterized in that: The identification groove is a circular groove, and the conductive connector is a cylinder.

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