Intelligent key cabinet based on mechanical lock

Abstract

The utility model discloses an intelligent key cabinet based on a mechanical lock, which comprises a cabinet body, a plurality of key positions are arranged on the cabinet body, a door plate, a cam lock, a cam lock key, a touch switch and an electromagnet are arranged on the key positions, the cam lock is mounted on the door plate, a key hole of the cam lock is positioned on the front surface of the door plate, and a tongue of the cam lock is positioned on the back surface of the door plate. The touch switch and the electromagnet are both installed on the back face of the door plate and are both electrically connected with a lock control plate in the cabinet body, a tongue of the cam lock is provided with a first position and a second position, and the cam lock key is used for driving the tongue of the cam lock to be switched between the first position and the second position. A telescopic bolt of the electromagnet is used for preventing a tongue of the cam lock from being switched between the first position and the second position. The research and development and production cost of the intelligent key cabinet is greatly reduced, the key is small and exquisite, and the application scene is wide.

Description

Technical Field

[0001] This utility model relates to the field of key cabinet technology, specifically to an intelligent key cabinet based on a mechanical lock. Background Technology

[0002] Most mainstream smart key cabinets on the market currently use RFID technology to detect key presence and prevent misplacement or misdelivery. The principle is as follows: each key is equipped with an RFID key tag with a built-in electronic chip, which stores unique identification information. The key cabinet integrates an RFID reader / writer. When a key is placed inside, the reader / writer emits a radio frequency signal to activate the key tag chip. The chip then sends back a unique identification code and other information to the reader / writer. The reader / writer analyzes the signal to confirm the key's presence and synchronizes the status information to the management system for recording and display. When a key is removed, the reader cannot read the corresponding key tag signal, and the system automatically updates the key status to "out of position."

[0003] However, the aforementioned smart key cabinets based on RFID identification technology have significant drawbacks: Each key slot requires an independent RFID reader, and a specific structure is needed to limit and lock the keys upon return. This necessitates the development of proprietary molds, involving multiple customization stages such as sheet metal processing, plastic mold design and production, microcontroller hardware design and production, and system software development. High shielding requirements for the cabinet also contribute to its high cost and selling price. Furthermore, strict requirements govern the placement of items, such as avoiding contact with metal, thus limiting the application scope of smart key cabinets. In addition, RFID key tags, due to their built-in coils and the need for matching plastic structural components, are bulky and inconvenient to carry. They also cannot be designed as retractable pull-out boxes because the metal springs inside would interfere with RFID reader reading. Utility Model Content

[0004] In order to overcome the problems of high production cost and high selling price, limited application scenarios and large size of RFID key tags in the existing RFID smart key cabinet, this utility model provides a smart key cabinet based on mechanical lock.

[0005] The technical solution of this utility model is as follows:

[0006] A smart key cabinet based on a mechanical lock includes a cabinet body with multiple key slots. Each key slot has a door panel, a rotary latch, a rotary latch key, a tactile switch, and an electromagnet. The rotary latch is mounted on the door panel, with the keyhole located on the front of the door panel and the latch located on the back. The tactile switch and electromagnet are both mounted on the back of the door panel and electrically connected to a lock control board inside the cabinet. The latch has a first position and a second position. The rotary latch key is used to switch the latch between the first and second positions. The telescopic bolt of the electromagnet is used to prevent the latch from switching between the first and second positions.

[0007] When the tongue of the rotary lock is in the first position, the tongue of the rotary lock contacts the sensing point of the tactile switch, and the rotary lock key is locked in the keyhole of the rotary lock.

[0008] When the tongue of the rotary lock is in the second position, the tongue of the rotary lock is misaligned with the sensing point of the tactile switch, and the keyhole of the rotary lock is released from locking the rotary lock key lock.

[0009] As a preferred embodiment of this utility model, each key position has a one-to-one correspondence between the rotary lock and the rotary lock key.

[0010] In a preferred embodiment of this utility model, the tactile switch and the electromagnet are mounted on the back of the door panel via a fixed bracket;

[0011] When the tongue of the rotary lock rotates from the first position to the second position, the tongue of the rotary lock contacts the fixed bracket.

[0012] As a preferred embodiment of this utility model, an indicator light is also provided on the key position, the indicator light is installed on the door panel, and the indicator light is electrically connected to the lock control board.

[0013] As a preferred embodiment of this utility model, the tactile switch is a spring-loaded tactile switch.

[0014] As a preferred embodiment of this utility model, a central control screen is provided on the cabinet, and the central control screen is electrically connected to the lock control board.

[0015] As a preferred embodiment of this utility model, the cabinet has a large door and a small door on the front, a middle door behind the large door, a key slot installed on the middle door, an electric lock installed on the large door, the electric lock being electrically connected to the lock control board, and a central control screen installed on the small door.

[0016] As a preferred embodiment of this utility model, a transparent viewing window is provided in the middle of the gate.

[0017] As a preferred embodiment of this utility model, a power supply is provided inside the cabinet, and the power supply is electrically connected to the lock control panel.

[0018] In a preferred embodiment of this utility model, the power supply is a UPS power supply.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. The door panel, rotary lock, rotary lock key, tactile switch, electromagnet and indicator light on the key position are all made using conventional products that are already on the market, which makes the overall R&D cost and threshold lower than that of RFID smart key cabinet. RFID smart key cabinet has additional costs for plastic structural parts mold opening and RFID reader R&D.

[0021] 2. The elimination of RFID readers, plastic structural parts, and RFID key tags significantly reduces production costs;

[0022] 3. The key does not need to integrate a coil and can be designed into a compact form with a retractable pull-out box. It is compatible with metal parts and is suitable for various scenarios such as smart tool cabinets, self-service book lending and returning cabinets, and smart filing cabinets. It breaks through the limitations of RFID technology on metal shielding and item placement, has a wider range of applications, and is easy to carry.

[0023] 4. Applicable to scenarios requiring key management, such as corporate offices, property management, hotels, medical institutions, public transportation, and financial institutions, especially involving key cabinet identity verification, key storage and retrieval, and low-cost in-situ detection and anti-misplacement technology. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a front view of an intelligent key cabinet based on a mechanical lock according to one embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of a smart key cabinet based on a mechanical lock according to one embodiment of the present invention;

[0027] Figure 3This is a schematic diagram of the key position when the tongue of the rotary lock is in the first position in one embodiment of the present invention;

[0028] Figure 4 This is a structural schematic diagram of the key position from another perspective when the tongue of the rotary lock is in the first position according to one embodiment of the present invention.

[0029] Figure 5 This is a schematic diagram of the key position when the tongue of the rotary lock is in the second position in one embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the key position from another perspective when the tongue of the rotary lock is in the second position, according to one embodiment of the present invention.

[0031] Figure 7 This is a schematic diagram of the structure of the fixing bracket for the key position in one embodiment of the present invention.

[0032] In the diagram,

[0033] 1. Cabinet body; 2. Main door; 201. Transparent viewing window; 3. Small door; 4. Middle door; 5. Key slot; 501. Door panel; 502. Rotary latch lock; 5021. Keyhole; 5022. Tongue; 503. Tactile switch; 504. Electromagnet; 5041. Telescopic bolt; 505. Indicator light; 506. Fixed bracket; 5061. Limiting hole; 6. Electric lock; 7. Central control screen; 8. Lock control board; 9. Power supply. Detailed Implementation

[0034] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. It is also declared that the embodiments described below are only for explaining this utility model and are not intended to limit this utility model.

[0035] It should be noted that the terms "installation," "setting," "connection," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Indications of orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used in the application's product, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. "A plurality" means two or more, unless otherwise explicitly defined.

[0036] Please see Figures 1 to 6 This utility model provides an intelligent key cabinet based on a mechanical lock, including a cabinet body 1. The front of the cabinet body 1 is provided with a large door 2 and a small door 3. A middle door 4 is provided behind the large door 2. The middle door 4 is provided with multiple key slots 5. The large door 2 is provided with an electric lock 6. The small door 3 is provided with a central control screen 7. A lock control plate 8 is provided inside the cabinet body 1. The lock control plate 8 is electrically connected to the multiple key slots 5, the electric lock 6 and the central control screen 7 respectively.

[0037] The key position 5 includes a door panel 501, a rotary latch 502, a rotary latch key (not shown in the figure, the same below), a tactile switch 503, an electromagnet 504, and an indicator light 505. The rotary latch 502 and the indicator light 505 are installed on the door panel 501. The keyhole 5021 of the rotary latch 502 is located on the front of the door panel 501, and the latch 5022 of the rotary latch 502 is located on the back of the door panel 501. The tactile switch 503 and the electromagnet 504 are both installed on the back of the door panel 501, and the tactile switch 503, the electromagnet 504, and the indicator light 505 are all electrically connected to the lock control board 8 inside the cabinet 1. The latch 5022 of the rotary latch 502 has a first position and a second position. The rotary latch key is used to switch the latch 5022 of the rotary latch 502 between the first position and the second position. The electromagnet 504... The telescopic bolt 5041 is used to prevent the tongue 5022 of the rotary latch 502 from switching between the first and second positions. When the tongue 5022 of the rotary latch 502 is in the first position, it contacts the sensing point of the tactile switch 503. At this time, since the rotary latch key is not rotated to the pull-out position, it is locked in the keyhole 5021 of the rotary latch 502 and cannot be pulled out from the keyhole 5021. When the tongue 5022 of the rotary latch 502 is in the second position, it is misaligned with the sensing point of the tactile switch 503. At this time, the rotary latch key rotates to the pull-out position, the keyhole 5021 of the rotary latch 502 is released from locking, and the rotary latch key can be pulled out from the keyhole 5021. At the same time, each key position 5 has a one-to-one correspondence between the rotary lock 502 and the rotary lock key, meaning that each key position 5's rotary lock 502 can only be turned when the corresponding rotary lock key is inserted, thus preventing the wrong key from being inserted.

[0038] Working principle:

[0039] In the initial state, the key of each key position 5 is inserted into the keyhole 5021 of the corresponding rotary lock 502, and when the tongue 5022 of the rotary lock 502 is in the first position, the tongue 5022 of the rotary lock 502 contacts the sensing point of the tactile switch 503, the key of the rotary lock is locked in the keyhole 5021 of the rotary lock 502, and the telescopic bolt 5041 of the electromagnet 504 extends to prevent the tongue 5022 of the rotary lock 502 from switching from the first position to the second position;

[0040] When retrieving a key, the user initiates the retrieval process on the central control screen 7. After the central control screen 7 confirms the user's identity (e.g., through facial recognition, fingerprint scanning, QR code scanning, or password verification), it lists the available key slots 5. The user selects a key slot 5, and the corresponding indicator light 505 flashes (or displays other flashing patterns). The telescopic bolt 5041 of the corresponding electromagnet 504 retracts, and simultaneously, the electric lock 6 of the gate 2 opens. The user can then rotate the rotary lock key corresponding to key slot 5 in a rotatable direction (e.g., clockwise). The rotary lock key causes the tongue 5022 of the rotary lock 502 to switch from the first position to the second position, and then the rotary lock key can be pulled out. If the rotation is not complete, the rotary lock key cannot be pulled out of the keyhole 5021 of the rotary lock 502. At this point, the tongue 5022 of the rotary latch 502 is misaligned with the sensing point of the tactile switch 503. The system senses that the rotary latch key in key position 5 has been removed, and the telescopic bolt 5041 of the electromagnet 504 re-extends. Simultaneously, the indicator light 505 becomes constantly lit (or flashes in another state) to indicate that the key removal operation is complete. The re-extending of the telescopic bolt 5041 of the electromagnet 504 is to prevent the user from placing the rotary latch key back into key position 5 without proper authentication.

[0041] When storing a key, the user performs a return operation on the central control screen 7. After the central control screen 7 confirms the user's identity (e.g., through facial recognition / fingerprint / QR code / password), it lists the key slot 5 to be returned. The indicator light 505 corresponding to key slot 5 flashes (or displays other flashing states), the telescopic bolt 5041 of the corresponding electromagnet 504 retracts, and the electric lock 6 of the door 2 opens. The user can then insert the rotary lock key into the keyhole 5021 of the corresponding rotary lock 502 and rotate it in a rotatable direction (e.g., counterclockwise). The rotary lock key causes the tongue 5022 of the rotary lock 502 to switch from the second position to the first position. At this time, the tongue 5022 of the rotary lock 502 contacts the sensing point of the tactile switch 503. The system senses that the rotary lock key in key slot 5 has been returned, re-extends the telescopic bolt 5041 of the electromagnet 504, and the indicator light 505 becomes constantly lit (or displays other flashing states) to indicate that the key storage operation is complete. The telescopic bolt 5041 of the electromagnet 504 extends again, preventing the tongue 5022 of the rotary lock 502 from rotating, thus preventing the rotary lock key from rotating. Since the rotary lock key cannot be pulled out until it is rotated to the withdrawable position, only authorized and selected rotary lock keys will trigger the system to instruct the keyhole 5021 board to control the telescopic bolt 5041 of the corresponding electromagnet 504 to retract, allowing the rotary lock key to rotate to the withdrawable position. This prevents the wrong key from being taken or the intentional use of an unauthorized key. Furthermore, the mechanical structure of conventional rotary locks 502 on the market ensures that inserting the wrong key will prevent it from rotating; only when the correct key is inserted will it rotate, activating the touch switch 503, allowing the system to determine if the correct rotary lock key has been returned, thus preventing the wrong key from being inserted.

[0042] This utility model is a smart key cabinet based on a mechanical lock. The door panel 501, rotary lock 502, rotary lock key, tactile switch 503, electromagnet 504, and indicator light 505 on the key slot 5 are all made using existing conventional products on the market. This makes the overall R&D cost and threshold lower than that of an RFID smart key cabinet, which incurs additional costs for plastic structural parts molding and RFID reader development. By eliminating the RFID reader, plastic structural parts, and RFID key tags, the production cost is significantly reduced, accounting for approximately half the cost of an RFID smart key cabinet (assuming a key cabinet with 50 or more slots). In addition, since the key does not require an integrated coil, it can be designed as a compact form with a retractable pull-out box, adapting to metal parts. It is suitable for various scenarios such as smart tool cabinets, self-service book lending and returning cabinets, and smart filing cabinets, overcoming the limitations of RFID technology on metal shielding and item placement, thus having a wider range of applications and being easy to carry.

[0043] Please see Figure 4 , Figure 6In one embodiment, the tactile switch 503 and the electromagnet 504 are mounted on the back of the door panel 501 via a fixing bracket 506. The fixing bracket 506 provides mechanical support to ensure the precise relative positions of the tactile switch 503, the electromagnet 504, and the tongue 5022 of the rotary latch 502. Furthermore, when the tongue 5022 of the rotary latch 502 rotates from the first position to the second position, the tongue 5022 contacts the fixing bracket 506 to form a physical stop, preventing the tongue 5022 from continuing to rotate. This avoids the tongue 5022 from over-rotating and disengaging from the sensing point of the tactile switch 503, ensuring that the tactile switch 503 can stably sense the position of the tongue 5022 (e.g., whether it is in place), and preventing system misjudgment due to positional deviation.

[0044] Please see Figure 7 Furthermore, the fixed bracket 506 is provided with a limiting hole 5061 through which the telescopic bolt 5041 of the power supply magnet 504 passes. The limiting hole 5061 provides a precise movement track for the telescopic bolt 5041 of the electromagnet 504, ensuring that its telescopic movement is smooth and without deviation, avoiding the failure of the telescopic bolt 5041 to block due to shaking or jamming (such as the inability to effectively lock the position of the tongue 5022), and improving the reliability of mechanical locking.

[0045] In one embodiment, the tactile switch 503 is a spring-loaded tactile switch. The spring-loaded structure triggers a signal through physical contact. When the tongue 5022 of the rotary lock 502 presses against the spring, it can quickly change the circuit's on / off state, ensuring the system can perceive the key's position in real time and avoiding delays or misjudgments. The spring-loaded switch is compact and can fit snugly against the tongue 5022 of the rotary lock 502, adapting to the compact space layout of the key position 5. Simultaneously, it utilizes the spring's elastic reset characteristic to form a stable linkage with the rotational movement of the tongue 5022 of the rotary lock 502. Furthermore, the spring-loaded tactile switch is a mature and standardized component with low procurement costs and no need for complex circuit matching, further enhancing the low-cost advantage of this invention.

[0046] Please see Figure 1 In one embodiment, a transparent viewing window 201 is provided in the middle of the gate 2. Through the transparent window, staff or users can intuitively observe the key's position (such as the exposed part of the key when inserted, the status of indicator light 505, etc.).

[0047] Please see Figure 2In one embodiment, a power supply 9 is installed inside the cabinet 1. The power supply 9 is electrically connected to the lock control board 8 to provide power to components such as the lock control board 8, the central control screen 7, the electromagnet 504, and the indicator light 505. Preferably, the power supply 9 is a UPS power supply. The UPS power supply can provide continuous and stable power (such as 12VDC) to ensure the normal operation of components such as the lock control board 8, the central control screen 7, the electromagnet 504, and the indicator light 505, and avoid system abnormalities caused by voltage fluctuations (such as malfunction of the electromagnet 504 or failure of the tactile switch 503 signal). In addition, the UPS power supply can maintain the system's operation for a short time when the mains power is interrupted, ensuring that users can complete emergency key access operations and avoiding the risk of the key cabinet being locked and unusable due to power failure.

[0048] In one embodiment, three sets of two-core wires—indicator light 505 (2-pin, 12VDC), tactile switch 503 (2-pin), and electromagnet 504 (2-pin, 12VDC)—are connected to the lock control board 8. The lock control board 8 is connected to the 485 interface of the central control screen 7 via a 485 two-core wire. If the number of key positions 5 increases, multiple lock control boards 8 can be cascaded via 485 wires.

[0049] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

[0050] The present utility model patent has been described above with reference to the accompanying drawings. Obviously, the implementation of the present utility model patent is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present utility model patent, or the direct application of the inventive concept and technical solution of the present utility model patent to other occasions without modification, are all within the protection scope of the present utility model.

Claims

1. A smart key cabinet based on a mechanical lock, comprising a cabinet body, wherein the cabinet body is provided with multiple key slots, characterized in that: The key position is equipped with a door panel, a rotary latch, a rotary latch key, a tactile switch, and an electromagnet. The rotary latch is installed on the door panel, with the keyhole of the rotary latch located on the front of the door panel and the latch of the rotary latch located on the back of the door panel. The tactile switch and the electromagnet are both installed on the back of the door panel and are electrically connected to the lock control board inside the cabinet. The latch of the rotary latch has a first position and a second position. The rotary latch key is used to drive the latch of the rotary latch to switch between the first position and the second position. The telescopic bolt of the electromagnet is used to prevent the latch of the rotary latch from switching between the first position and the second position. When the tongue of the rotary lock is in the first position, the tongue of the rotary lock contacts the sensing point of the tactile switch, and the rotary lock key is locked in the keyhole of the rotary lock. When the tongue of the rotary lock is in the second position, the tongue of the rotary lock is misaligned with the sensing point of the tactile switch, and the keyhole of the rotary lock is released from locking the rotary lock key lock.

2. The intelligent key cabinet based on a mechanical lock according to claim 1, characterized in that, Each key position corresponds one-to-one with the rotary lock and the rotary lock key.

3. The intelligent key cabinet based on a mechanical lock according to claim 1, characterized in that, The tactile switch and the electromagnet are mounted on the back of the door panel via a fixed bracket; When the tongue of the rotary lock rotates from the first position to the second position, the tongue of the rotary lock contacts the fixed bracket.

4. The intelligent key cabinet based on a mechanical lock according to claim 1, characterized in that, An indicator light is also provided on the key position. The indicator light is installed on the door panel and is electrically connected to the lock control board.

5. The intelligent key cabinet based on a mechanical lock according to claim 1, characterized in that, The tactile switch is a spring-loaded tactile switch.

6. The intelligent key cabinet based on a mechanical lock according to claim 1, characterized in that, The cabinet is equipped with a central control screen, which is electrically connected to the lock control board.

7. The intelligent key cabinet based on a mechanical lock according to claim 6, characterized in that, The cabinet has a large door and a small door on the front, and a middle door behind the large door. The key slot is installed on the middle door. An electric lock is installed on the large door and is electrically connected to the lock control board. The central control screen is installed on the small door.

8. The intelligent key cabinet based on a mechanical lock according to claim 7, characterized in that, A transparent viewing window is provided in the middle of the gate.

9. The intelligent key cabinet based on a mechanical lock according to claim 1, characterized in that, A power supply is installed inside the cabinet, and the power supply is electrically connected to the lock control panel.

10. The intelligent key cabinet based on a mechanical lock according to claim 9, characterized in that, The power supply is a UPS power supply.

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