An intelligent key box

Abstract

The utility model relates to the field of intelligent security equipment, provide a kind of intelligent key box.It includes box body and flip cover, there is lock cylinder mechanism in flip cover, including lock cylinder cover and lock cylinder relatively rotatable, the cooperation relationship can be switched between linkage and non-linkage.The lock cylinder is connected with locking plate, and can be switched in locking and unlocking position with the rotation of lock cylinder, respectively realize the locking of flip cover, open.The outside of flip cover has knob with keyhole, and is circumferentially linked with lock cylinder.There is intelligent control mainboard in flip cover, receives verification electronic unlocking instruction;Electric control execution component is connected with mainboard, selectively locks or releases lock cylinder cover.When mechanically unlocking, key insertion makes lock cylinder rotate alone and drive locking plate to unlock;When intelligently unlocking, mainboard verifies pass, and electric control component makes lock cylinder rotate synchronously to unlock.The key box has mechanical and electronic double unlocking guarantee, can emergently unlock, realizes the seamless switching of unlocking.

Description

Technical Field

[0001] This utility model relates to the field of intelligent security equipment technology, and in particular to an intelligent key box. Background Technology

[0002] Traditional key boxes are typically fixed to the outside of doors to store small items such as mechanical keys and IC cards, allowing users to access them temporarily or authorize others to enter. While common mechanical combination key boxes are simple in structure, they have significant drawbacks: users easily forget the combination, making it impossible to open the box; changing the combination is cumbersome; and the mechanical structure is prone to wear and tear or accidental activation after prolonged use, posing certain security risks. These products, relying solely on mechanical combination locks for opening and closing, cannot meet the dual demands of modern smart homes for both security and convenience.

[0003] With the development of electronic technology, fully electronically controlled smart key boxes have emerged, supporting unlocking methods such as passwords, fingerprints, or remote APP access, improving ease of use and intelligence. However, these products rely entirely on electronic systems and power supplies. If a program error, electronic component failure, or battery depletion occurs, the entire system will malfunction, leaving the user unable to open the key box. Especially in emergency situations, this design flaw of relying solely on electronic systems can have serious consequences.

[0004] In existing technologies, the combination of mechanical and electronic locks often involves complex structures, making it difficult to achieve seamless switching between mechanical and intelligent unlocking. In the event of electronic system failure, most products require an additional emergency key or complex unlocking procedures for mechanical unlocking, failing to provide true dual protection. Furthermore, the lock cylinder mechanism of traditional key boxes typically lacks precise positioning capabilities, making it prone to locking failure due to misoperation.

[0005] Therefore, the market urgently needs a key box that retains the reliability of traditional mechanical locks while integrating intelligent electronic unlocking methods. This would ensure convenience and fundamentally solve the problem of being unable to unlock the lock due to forgotten passwords, electronic malfunctions, or power outages. Such an improvement requires the coordinated operation of mechanical and electronic systems while maintaining a compact structure and ease of operation. Existing technologies urgently need improvement to address these issues. Summary of the Invention

[0006] To address the aforementioned issues, the present invention aims to provide an intelligent key box with both mechanical and electronic unlocking mechanisms. In the event of electronic system failure, the key box can still be unlocked via a mechanical key, while simultaneously enabling seamless switching between intelligent and mechanical unlocking.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This application provides a smart key box, the technical solution of which is as follows: A smart key box includes a box body and a flip cover pivotally connected to the box body, characterized in that: a lock cylinder mechanism is provided inside the flip cover, the lock cylinder mechanism includes a lock cylinder sleeve and a lock cylinder disposed therein and rotatable relative to it, the lock cylinder and the lock cylinder sleeve are in a cooperative relationship that can be selectively in a linked state or a non-linked state; a locking plate is connected to the inner end of the lock cylinder, the locking plate is circumferentially linked with the lock cylinder, and can switch between a locked position and an unlocked position by rotating with the lock cylinder; in the locked position, the locking plate is engaged with the box body to lock the flip cover; in the unlocked position, the locking plate is disengaged from the box body to allow the flip cover to open; the outer side of the flip cover is provided with a circumferential connection to the lock cylinder. The lock cylinder features a rotary knob with a keyhole leading to it. Inside the flip cover are: - a smart control motherboard configured to receive and verify unlocking commands using at least one electronic authentication method; - an electronically controlled actuator electrically connected to the smart control motherboard for selectively locking or releasing the lock cylinder sleeve. During mechanical unlocking, the key is inserted into the lock cylinder through the keyhole, placing the lock cylinder and lock cylinder sleeve in a non-linked state. Turning the knob at this time causes the lock cylinder to rotate independently, thereby rotating the locking plate to the unlocked position. During intelligent unlocking, after successful verification by the smart control motherboard, the electronically controlled actuator releases the lock cylinder sleeve, placing the lock cylinder and lock cylinder sleeve in a linked state. Turning the knob at this time causes the lock cylinder, lock cylinder sleeve, and locking plate to rotate synchronously to the unlocked position.

[0009] Furthermore, this application also proposes that the lock cylinder and the lock cylinder sleeve are coupled through a blade structure. When a matching key is inserted, the blade on the lock cylinder retracts, allowing it to rotate independently of the lock cylinder sleeve. When the key is removed, the blade pops out and causes the lock cylinder and the lock cylinder sleeve to move circumferentially together.

[0010] Furthermore, this application also proposes that the circumferential head of the lock cylinder sleeve is provided with one or more positioning grooves; the flip cover is provided with a positioning component, the positioning component including a positioning block with a pointed end and an elastic element that forces the pointed end into the positioning groove, for positioning the rotation of the lock cylinder sleeve.

[0011] Furthermore, this application also proposes that the positioning grooves are four in number and arranged at 90° intervals, so that the rotation of the lock cylinder sleeve is limited to a 90° rotation.

[0012] Furthermore, this application also proposes that the electronically controlled actuator is an electromagnet, whose iron core pops out and gets stuck in the locking groove at the tail of the lock cylinder sleeve in the locked state. After receiving a signal from the intelligent control motherboard, it is attracted, causing the iron core to disengage from the locking groove and thus release the lock cylinder sleeve.

[0013] Furthermore, this application also proposes that the flip cover includes a flip cover bracket and a flip cover body disposed on the flip cover bracket; the flip cover body is provided with a knob hole, and a barrel-shaped cavity extends inward from the knob hole to accommodate the knob, the lock cylinder and the lock cylinder sleeve; a mounting cavity is provided on each side of the barrel-shaped cavity, which is used to install the positioning component and the electronic control actuator, respectively, and the mounting cavity and the barrel-shaped cavity are connected by a slot.

[0014] Furthermore, this application also proposes that the upper part of the flip cover bracket is provided with a lock cylinder hole, part of which is a large fan-shaped hole; the tail of the lock cylinder is provided with a square boss that extends out of the lock cylinder hole; and the locking plate is fastened to the square boss at the tail of the lock cylinder by screws.

[0015] Furthermore, this application also proposes that the lock cylinder sleeve is provided with an arc-shaped block, which is engaged in the large fan-shaped hole, so that the rotation angle of the lock cylinder sleeve is limited to 90°.

[0016] Furthermore, this application also proposes that the electronic authentication methods supported by the intelligent control motherboard include at least one of the following: password authentication, fingerprint authentication, mobile APP remote control authentication, and temporary password authentication.

[0017] Furthermore, this application also proposes that a dust cover be detachably attached to the keyhole of the knob.

[0018] As can be seen from the above, the intelligent key box and its lock cylinder mechanism, knob and intelligent control system provided in this application, through the linkage state switching mechanism between the lock cylinder and the lock cylinder sleeve, combined with the coordinated control of the intelligent control motherboard and the electronic control execution component, realize intelligent unlocking operation while retaining the emergency unlocking function of the mechanical key, effectively solving the problem of traditional key boxes being unable to unlock due to forgotten passwords, electronic failures or power outages, and has dual security protection and convenient operation. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of a smart key box provided in this application.

[0020] Figure 2 This is a cross-sectional schematic diagram of a smart key box provided in this application.

[0021] Figure 3 An explosion illustration of a smart key box provided in this application. Figure 1 .

[0022] Figure 4 An explosion illustration of a smart key box provided in this application. Figure 2 . Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In existing technologies, traditional key boxes mostly use mechanical combination locks or purely electronic control structures. Mechanical combination locks are susceptible to the risk of forgetting the password, and after long-term use, structural wear can lead to accidental activation or malfunction. Purely electronic key boxes rely on a power supply system, and when the battery runs out or electronic components fail, the lock becomes completely unusable. Both of these structures have a single point of failure and cannot provide reliable unlocking security in emergency situations.

[0029] To address these issues, designers discovered that the mechanical and electronic structures of traditional key boxes are independent and cannot effectively complement each other. After numerous experiments, they found that integrating the mechanical lock cylinder and electronic control module onto the same rotating axis, and using a state-switching mechanism to coordinate the two unlocking methods, could solve the reliability deficiencies of single locks. The specific approach is to set a switchable linkage state within the lock cylinder mechanism, so that mechanical key operation only drives the lock cylinder, while electronic authentication unlocks the lock cylinder sleeve, achieving overall linkage and forming a dual operation path.

[0030] like Figure 1-4 As shown, this application proposes a smart key box, including a box body 1 and a flip cover 2 pivotally connected to the box body 1. The flip cover 2 houses a lock cylinder mechanism, which includes a lock cylinder sleeve 3 and a lock cylinder 4 fitted inside it. The lock cylinder 4 and the lock cylinder sleeve 3 form a switchable linkage state. A circumferentially linked locking plate 5 is connected to the inner end of the lock cylinder 4. The locking plate 5 switches between a locked position and an unlocked position by rotation. A knob 6 with a keyhole is provided on the outer side of the flip cover 2, and the knob 6 is circumferentially linked with the lock cylinder 4. A smart control motherboard 7 and an electronic control execution component 8 are provided inside the flip cover 2. After verifying the electronic authentication command, the smart control motherboard 7 controls the electronic control execution component 8 to release the lock cylinder sleeve 3. During mechanical unlocking, a key is inserted into the lock cylinder 4, causing it to rotate independently and unlock the locking plate 5; during smart unlocking, the electronic control execution component 8 releases the lock cylinder sleeve 3, causing the lock cylinder 4 and the lock cylinder sleeve 3 to rotate and unlock in linkage.

[0031] The linkage between lock cylinder 4 and lock cylinder sleeve 3 refers to the engagement and disengagement of their power transmission through their internal structures. The circumferential linkage between locking plate 5 and lock cylinder 4 refers to their synchronous rotation achieved through a non-circular cross-section or keyway structure. The release of lock cylinder sleeve 3 by the electronically controlled actuator 8 refers to the removal of the restriction on its rotation. The electronic authentication methods of the intelligent control motherboard 7 include password or fingerprint recognition; for example, the motherboard integrates a fingerprint sensor module and connects it to the actuator via circuitry.

[0032] Specifically, when using a mechanical key to unlock, the key is inserted into the keyhole of knob 6 and extends into the lock cylinder 4, disengaging the lock cylinder 4 from the lock cylinder sleeve 3. At this time, rotating knob 6 only rotates the lock cylinder 4, causing the locking plate 5 at the tail of the lock cylinder 4 to rotate and disengage from the slot in the housing 1, thus unlocking the flip cover 2. When using smart unlocking, after the user completes authentication via password or fingerprint, the smart control board 7 sends a signal to the electronic control actuator 8. The electronic control actuator 8 releases the lock cylinder sleeve 3, allowing it to rotate freely. At this time, rotating knob 6 causes the lock cylinder 4 and lock cylinder sleeve 3 to rotate synchronously, and the locking plate 5 rotates with the overall mechanism to the unlocked position. Both unlocking methods share the same rotating operating component, but different power transmission paths are achieved through the switching of the lock cylinder 4's linkage state.

[0033] This solution employs a linkage switching design between lock cylinder sleeve 3 and lock cylinder 4, creating a dual-protection mechanism that physically isolates mechanical key operation from electronic control. Even in the event of an electronic system failure, unlocking can still be performed independently using the mechanical key; conversely, if the key is lost, unlocking can be achieved through electronic authentication, preventing system paralysis due to a single malfunction. Through this technical solution, this application effectively addresses the problem of traditional key boxes being unable to unlock due to the failure of a single lock. The independent operation mechanism of the mechanical and electronic unlocking paths ensures that unlocking can still be completed through a backup method even when the battery is depleted, electronic components are damaged, or the mechanical key is lost. The linkage state switching design between lock cylinder sleeve 3 and lock cylinder 4 allows both unlocking methods to share the same locking actuator, simplifying the structure while achieving dual protection. The intelligent control motherboard 7 supports multiple authentication methods, further enhancing the flexibility of the unlocking process.

[0034] In the specific implementation scheme, the lock cylinder 4 and the lock cylinder sleeve 3 are coupled through a blade structure. When a matching key is inserted, the blades on the lock cylinder 4 retract, allowing it to rotate independently of the lock cylinder sleeve 3. When the key is removed, the blades pop out, causing the lock cylinder 4 and the lock cylinder sleeve 3 to move circumferentially together. The blade structure refers to a set of retractable metal plates located between the outer wall of the lock cylinder 4 and the inner wall of the lock cylinder sleeve 3. Specifically, this can be achieved using a spring-loaded return mechanism. When the key is inserted, the blades are compressed and contract, releasing the circumferential constraint between the lock cylinder 4 and the lock cylinder sleeve 3. The retraction action refers to the radial displacement of the blades caused by the pressure of the key teeth during key insertion. This can be achieved through the inclined surface of the key teeth and the blade contact surface, creating a lateral force that drives the blades to retract when the key is pushed in. The pop-out action refers to the blades returning to their initial position under the action of elastic force after the key is removed. This can be achieved through the elastic deformation of the blades themselves or the thrust of an additional spring, causing the blades to re-embed into the grooves of the inner wall of the lock cylinder sleeve 3, forming a circumferential linkage.

[0035] Specifically, during the mechanical unlocking process, when the key is inserted into the lock cylinder 4, its teeth compress the contact surface of the blade, forcing the blade to retract radially into the lock cylinder 4. At this time, the circumferential constraint between the outer wall of the lock cylinder 4 and the inner wall of the lock cylinder sleeve 3 is released, and the lock cylinder 4 can rotate independently of the lock cylinder sleeve 3. When the key is removed, the blade loses the external pressure and, under the action of elastic restoring force, pops outward and re-embeds into the groove of the inner wall of the lock cylinder sleeve 3, so that the lock cylinder 4 and the lock cylinder sleeve 3 resume circumferential linkage. This process is directly triggered by the insertion and removal of the key to switch the blade state, without manual intervention or additional control devices. Through the above technical solution, this application achieves the technical effect of reliably disengaging the lock cylinder 4 and the lock cylinder sleeve 3 during mechanical unlocking and automatically restoring linkage during non-mechanical operation. When the key is inserted, the blade is compressed and retracted, causing the lock cylinder 4 to rotate independently, ensuring the independence of the mechanical unlocking action; after the key is removed, the blade automatically pops out to restore the linkage relationship, ensuring the synchronous movement of the lock cylinder 4 and the lock cylinder sleeve 3 in intelligent control mode. This structure achieves state switching through physical contact and elastic reset mechanism, avoiding the use of electronic components or complex mechanical transmission mechanisms, and effectively reducing the risk of failure.

[0036] like Figure 1 and 3 As shown in Figure 4, a dust cover 14 is detachably connected to the keyhole of the knob 6. This detachable connection means that the dust cover 14 and the knob 6 form a non-fixed assembly relationship, which can be achieved through magnetic attraction, snap-fit ​​engagement, or threaded connection, allowing the dust cover 14 to be manually separated or re-secured. Specifically, when not in use, the dust cover 14 covers the keyhole, forming a sealed interface to prevent external dust or liquid from entering the lock cylinder 4. When a key needs to be inserted, the dust cover 14 is directly removed or rotated out, exposing the keyhole for operation. For example, when using a snap-fit ​​engagement, the edge of the dust cover 14 has an elastic protrusion, and the corresponding position of the knob 6 has a groove; the elastic protrusion is pressed into the groove to form a fixed shape. When using a magnetic attraction, a magnet is embedded in the bottom of the dust cover 14, and a metal plate is provided in the corresponding area of ​​the knob 6, allowing for quick assembly and disassembly through magnetic attraction. Through the above technical solution, this application forms a physical isolation layer in the keyhole exposed state, preventing dust from accumulating in the gaps between the blades inside the lock cylinder 4, and avoiding difficulty in key insertion or increased rotation resistance due to foreign objects getting stuck; at the same time, it prevents rainwater from seeping into the mating surface between the lock cylinder sleeve 3 and the lock cylinder 4 along the keyhole, preventing mechanical failure caused by oxidation and corrosion of metal parts. The quick-release feature of the dust cover 14 ensures that users do not need to perform additional unlocking steps when using the key to unlock; they can simply remove it to complete the operation.

[0037] In such Figure 3 and 4In the embodiment shown, the electronically controlled actuator 8 is an electromagnet. Its iron core pops out and gets stuck in the locking groove 32 at the tail of the lock cylinder sleeve 3 when it is locked. After receiving the signal from the intelligent control motherboard 7, it is attracted, causing the iron core to disengage from the locking groove 32 and thus releasing the lock cylinder sleeve 3.

[0038] Among them, the electromagnet refers to an electromagnetic device that controls the extension and retraction of an iron core through current. Specifically, it can be implemented using a push-pull electromagnet with a return spring. When the power is off, the spring pushes the iron core outward, and when the power is on, the electromagnetic force overcomes the spring force, causing the iron core to retract. The locking groove 32 refers to the groove structure set at the tail of the lock cylinder sleeve 3. Specifically, it can be implemented using a rectangular or trapezoidal cross-section groove, matching the shape of the end of the iron core to achieve locking and limiting. The lock cylinder sleeve 3 refers to the cylindrical component sleeved on the outer layer of the lock cylinder 4. Specifically, it can be made of metal or high-strength plastic, and the locking action of its tail with the iron core is directly related to the rotational freedom of the lock cylinder sleeve 3.

[0039] Specifically, in the locked state, the electromagnet is not energized, and the iron core is ejected outward by the spring force and embedded in the locking groove 32 at the tail of the lock cylinder sleeve 3. At this time, the lock cylinder sleeve 3 cannot rotate, and the lock cylinder 4 and the lock cylinder sleeve 3 are in a non-linked state. When the intelligent control motherboard 7 verifies the electronic authentication information, it sends an energizing signal to the electromagnet. The iron core is attracted and retracted by the electromagnetic force, disengaging from the locking groove 32, and the lock cylinder sleeve 3 is released from its mechanical limit. At this time, rotating the knob 6 can drive the lock cylinder 4 and the lock cylinder sleeve 3 to rotate synchronously, causing the locking plate 5 to switch to the unlocked position. If the electronic system experiences a power outage or malfunction, the electromagnet automatically returns to the power-off state, the iron core ejects again and locks into the locking groove 32, forcibly locking the lock cylinder sleeve 3 and preventing unauthorized opening. Through the above technical solution, this application can still keep the lock cylinder sleeve 3 fixed by the physical engagement of the iron core and the locking groove 32 when the electronic system fails, preventing the locking plate 5 from rotating accidentally; under normal electronic control, the retraction of the iron core can accurately release the lock cylinder sleeve 3's limit, ensuring the reliability of intelligent unlocking. This design eliminates the risk of power failure and loss of control in a single electronic control mode, while avoiding the shortcomings of pure mechanical locks in terms of intelligence.

[0040] like Figure 3 and 4As shown, the circumferential head of the lock cylinder sleeve 3 is provided with one or more positioning grooves 31; a positioning component is provided inside the flip cover 2, which includes a positioning block 9 with a pointed end and an elastic element that forces the pointed end into the positioning groove 31 for positioning the rotation of the lock cylinder sleeve 3. It is further proposed that there are four positioning grooves 31 arranged at 90-degree angles, so that the rotation of the lock cylinder sleeve 3 is limited to a 90-degree angle. The positioning groove 31 refers to the groove structure opened on the circumferential head of the lock cylinder sleeve 3, which can be implemented by machining discretely distributed grooves. The number of discretely distributed grooves is related to the required rotation angle of the lock cylinder sleeve 3. The positioning block 9 is a rigid component with a pointed end, which can be made of metal or high-strength plastic. The contact area between the pointed end and the positioning groove 31 is reduced to enhance the engagement strength. The elastic element is a mechanical element that provides continuous pressure, which can be implemented by a coil spring or a spring sheet. The elastic force parameter of the elastic element matches the depth and number of the positioning grooves 31 to ensure that the positioning block 9 has sufficient resistance when switching between different positioning grooves 31.

[0041] Specifically, during the rotation of the lock cylinder sleeve 3, the pointed end of the positioning block 9 is embedded into the positioning groove 31 under the pressure of the elastic element, forming a physical limit. When an external force drives the lock cylinder sleeve 3 to rotate, the pointed end of the positioning block 9 is forced to disengage from the current positioning groove 31, the elastic element deforms and stores elastic energy; when the lock cylinder sleeve 3 rotates to the corresponding position of the adjacent positioning groove 31, the elastic element releases energy to push the positioning block 9 to re-engage, completing the indexing positioning. For example, when the head of the lock cylinder sleeve 3 is provided with four positioning grooves 31, the rotation angle is limited to 90° each time, and the contact surface between the positioning block 9 and the groove is designed with a bevel to reduce frictional loss during disengagement. This mechanical positioning mechanism is independent of the electronic control system and provides physical constraints for the linkage rotation of the lock cylinder sleeve 3 and the lock cylinder 4 in the intelligent unlocking mode, avoiding rotation angle deviation caused by vibration or misoperation. Through the above technical solution, this application solves the offset problem caused by the lack of a positioning structure during the rotation of the lock cylinder sleeve 3, ensuring that the lock cylinder sleeve 3 can accurately reach the predetermined angle each time it rotates in the intelligent unlocking mode. The engaging action of the positioning block 9 and the positioning groove 31 provides a clear physical stop for the lock cylinder sleeve 3, preventing angular overshoot or rebound during linkage rotation. The continuous pressure of the elastic element keeps the positioning block 9 firmly against the surface of the lock cylinder sleeve 3, maintaining a stable engaging state even in a vibrating environment. This positioning structure is suitable for both mechanical and intelligent unlocking modes, ensuring reliable positioning of the lock cylinder sleeve 3 through mechanical constraints even in the event of electronic system failure.

[0042] like Figure 3 and 4As shown, the box body 1 is composed of a first shell 101 and a second shell 102; the flip cover 2 includes a flip cover bracket 11 and a flip cover body 12 disposed on the flip cover bracket 11. The flip cover body 12 is provided with a knob hole 15, and a barrel-shaped cavity 16 extends inward from the knob hole 15 to accommodate the knob 6, the lock cylinder 4, and the lock cylinder sleeve 3. There is a mounting cavity 17 on each side of the barrel-shaped cavity 16 for mounting the positioning component and the electronic control actuator 8, respectively. The mounting cavity 17 and the barrel-shaped cavity 16 are connected by a slot. The flip cover bracket 11 refers to the support frame that supports the flip cover body 12 and the internal components. Specifically, it can be made of metal stamping or high-strength engineering plastic injection molding, and is fixed to the flip cover body 12 by bolt connection or snap-fit ​​structure, and is used to distribute the torque load generated when the knob 6 is rotated. The barrel-shaped cavity 16 refers to the cylindrical cavity extending from the knob hole 15 into the interior of the flip cover 2. It can be integrally molded using injection molding, with its inner diameter fitting a clearance fit with the outer diameter of the lock cylinder sleeve 3 to constrain the radial displacement of the lock cylinder sleeve 3 and maintain coaxiality with the knob 6. The mounting cavity 17 refers to the independent accommodating spaces on both sides of the barrel-shaped cavity 16. Specifically, it can be formed by injection molding into rectangular grooves parallel to the barrel-shaped cavity 16, with a depth greater than the thickness of the positioning component and the electronic control actuator 8, to achieve physical isolation between the electronic and mechanical components. The through-slot refers to the rectangular channel formed between the mounting cavity 17 and the barrel-shaped cavity 16, used to transmit the elastic engagement action of the positioning component and the linear movement of the locking rod of the electronic control actuator 8.

[0043] Specifically, the flip cover bracket 11 and the flip cover body 12 form a double-layer composite structure, and the rigid support of the bracket offsets the bending moment deformation generated when the knob 6 is operated. The barrel-shaped cavity 16 integrates the lock cylinder sleeve 3, the lock cylinder 4, and the knob 6 on a unified axis, eliminating coaxiality errors during the assembly of multiple components. The mounting cavities on both sides 17 respectively house the positioning component and the electromagnet, wherein the positioning component forms an elastic engagement with the positioning groove 31 of the lock cylinder sleeve 3 through a slot, and the electromagnet transmits the linear movement of the iron core to the locking groove 32 of the lock cylinder sleeve 3 through the slot. The independent space design of the mounting cavity 17 keeps the electronic components and the mechanical moving parts at a safe distance, avoiding electromagnetic interference and mechanical collisions. Through the above technical solution, this application achieves spatial decoupling between the mechanical lock cylinder 4 and the electronic control components, eliminating the risk of positional interference during component assembly. The barrel-shaped cavity 16 ensures the rotational coaxiality of the lock cylinder sleeve 3 and the knob 6, making the mechanical transmission more stable and reliable. The independent mounting cavity 17 design effectively protects the electronic components and avoids poor contact caused by mechanical vibration. The through-slot structure isolates electronic components such as electromagnets from the rotational movement area of ​​the lock cylinder sleeve 3 while ensuring functional linkage, thereby reducing the impact of electromagnetic interference on the control signal.

[0044] Furthermore, the upper part of the flip cover bracket 11 is provided with a lock cylinder hole 18, a part of which is a large fan-shaped hole 20. The tail of the lock cylinder 4 is provided with a square boss 21, which extends out of the lock cylinder hole 18. The locking plate 5 is fastened to the square boss 21 at the tail of the lock cylinder 4 by screws. The flip cover bracket 11 refers to a support structure made of engineering plastic, specifically nylon or polycarbonate, used to fix the installation position of the lock cylinder 4 and the lock cylinder sleeve 3, and to prevent component displacement caused by mechanical vibration. The lock cylinder hole 18 is a through hole on the flip cover bracket 11 for accommodating the lock cylinder 4. Specifically, it can be implemented with a stepped hole structure. The conventional hole section matches the outer diameter of the lock cylinder 4, and the large fan-shaped hole 20 section provides rotation space for the arc-shaped block 19 of the lock cylinder sleeve 3. The rotation angle of the lock cylinder sleeve 3 is controlled by limiting the movement trajectory of the arc-shaped block 19. The square boss 21 refers to the geometric protrusion structure at the tail of the lock cylinder 4. It can be made of metal or plastic integrally formed with the lock cylinder 4, and is used to transmit rotational torque to the locking plate 5. Its square cross-section also prevents relative rotation between the lock cylinder 4 and the locking plate 5. Screw fastening refers to fixing the locking plate 5 and the lock cylinder 4 using a threaded connection. Countersunk screws or self-tapping screws can be used to avoid connection failures that may occur with traditional welding or snap-fit ​​methods.

[0045] Specifically, the flip cover bracket 11 is fixed inside the flip cover 2. The lock cylinder 4 passes through the conventional hole section of the lock cylinder hole 18. After the square boss 21 at the tail of the lock cylinder 4 passes through the lock cylinder hole 18, the locking plate 5 is directly fixed to the boss with screws. The square-section boss and the square hole of the locking plate 5 cooperate to ensure that the lock cylinder 4 and the locking plate 5 always maintain circumferential linkage. During rotation, the torque of the lock cylinder 4 is transmitted to the locking plate 5 through the square boss 21. The screw fastening method can prevent the locking plate 5 from axial displacement or loosening due to long-term use. Through the above technical solution, this application achieves a stable connection between the lock cylinder 4 and the locking component, avoiding mechanical loosening caused by long-term use. At the same time, by precisely controlling the rotation angle of the lock cylinder sleeve 3 through physical limit, it ensures that the locking plate 5 accurately switches between the locked and unlocked positions, improving the operational reliability and structural durability of the key box.

[0046] Furthermore, the lock cylinder sleeve 3 is provided with an arc-shaped block 19, which is engaged within the fan-shaped large hole 20, thus limiting the rotation angle of the lock cylinder sleeve 3 to 90°. The arc-shaped block 19 refers to a protruding structure on the outer wall of the lock cylinder sleeve 3, which can be implemented using a metal or plastic part integrally formed with the lock cylinder sleeve 3, and its curvature range matches the opening angle of the fan-shaped large hole 20. The arc-shaped block 19 forms a physical limit through contact with the edge of the fan-shaped large hole 20, thereby restricting the rotational stroke of the lock cylinder sleeve 3. The fan-shaped large hole 20 refers to a hole structure with a specific central angle opened on a plastic support, which can be manufactured using injection molding. The blocking surfaces formed by its two straight edges constrain the rotation range of the arc-shaped block 19, with the central angle set at 90° to achieve control of a quarter-circle motion. Specifically, after the arc-shaped block 19 is embedded in the fan-shaped large hole 20, the outer circumferential surface of the arc-shaped block 19 maintains a clearance fit with the inner wall of the fan-shaped large hole 20 during the rotation of the lock cylinder sleeve 3. When the lock cylinder sleeve 3 rotates to the 90° limit position, the end of the arc-shaped block 19 abuts against the straight edge blocking surface of the fan-shaped large hole 20, at which point the lock cylinder sleeve 3 cannot continue to rotate. This structure forces the lock cylinder sleeve 3 to complete only a 90° angular displacement each time it rotates through mechanical limiting, avoiding the misalignment of the locking plate 5 and the housing 1 due to excessive rotation. In the intelligent unlocking mode, when the lock cylinder sleeve 3 and the lock cylinder 4 rotate in conjunction, the fit clearance between the arc-shaped block 19 and the fan-shaped large hole 20 can absorb assembly errors, ensuring that the lock cylinder sleeve 3 can accurately reach the unlocked or locked position each time it rotates.

[0047] In the above solution, the intelligent control motherboard 7 supports at least one of the following electronic authentication methods: password authentication, fingerprint authentication, mobile APP remote control authentication, and temporary password authentication. Password authentication refers to identity verification through a preset fixed number combination, which can be implemented using a keyboard input module and a storage unit to meet regular unlocking needs. Fingerprint authentication refers to identity verification through biometric recognition technology, which can be implemented using capacitive or optical fingerprint sensors to enhance identity uniqueness. Mobile APP remote control authentication refers to authorization through interaction with a mobile terminal via wireless communication protocols, which can be implemented using Bluetooth, Wi-Fi, or cellular network modules to overcome physical space limitations. Temporary password authentication refers to generating a verification code with time-limited or single-use validity, which can be implemented using dynamic password algorithms or cloud server distribution methods for temporary authorization scenarios. Specifically, the intelligent control motherboard 7 integrates multiple authentication modules to form a redundant verification system. When a user selects password authentication, the entered number combination is compared with the preset value stored on the motherboard; if verification is successful, an unlocking signal is triggered. Fingerprint authentication avoids the risk of password leakage by collecting the user's biometric features and matching them with a pre-stored template. Remote control via mobile app receives authorization commands wirelessly, such as generating a temporary password and sending it to a designated mobile phone when the device is offline. Temporary password authentication can be set to be one-time or time-limited; for example, property management personnel can generate a temporary password valid for two hours for visitors. The four authentication methods complement each other: fixed passwords and temporary passwords cover long-term and short-term needs, fingerprint authentication strengthens identity uniqueness, and remote control expands spatial dimensions. When a module fails due to network interruption, sensor malfunction, or battery depletion, the other methods can still maintain the unlocking function.

[0048] exist Figure 3 In the shown scheme, the outer end face of the flip body 12 has a fingerprint sensor hole 121 and a password keypad frame 122 below the knob hole 15. The intelligent control motherboard 7 is installed in the inner end face of the flip body 12. The fingerprint sensor 71 is aligned with the fingerprint sensor hole, the keypad area 72 is aligned with the password keypad frame, the keypad 73 is placed in the password keypad area on the front of the flip body 12, and then the cover plate 74 is pasted on.

[0049] The above-mentioned smart key box can be opened as follows:

[0050] 1. Electronic Intelligent Unlocking: The user inputs the correct unlocking information via fingerprint recognition, password input, remote control via mobile APP, or temporary password authentication. After successful verification by the intelligent control motherboard 7, it sends a command to the electronic control actuator 8 (such as an electromagnet), energizing it and drawing the iron core into the base, thereby releasing the lock cylinder sleeve 3. At this time, the user rotates the knob 690°, which drives the lock cylinder 4. The lock cylinder 4 and the lock cylinder sleeve 3 are in a linked state and rotate together. The locking plate 5 at the tail of the lock cylinder 4 then flips 90° and descends to a position lower than the door frame of the housing 1. At this time, the flip cover 2 can be flipped open outwards, allowing the user to store and retrieve items. The electronic control actuator 8 automatically de-energizes and resets after a few seconds of power-on.

[0051] Locking Operation: Close the flip cover 2 and rotate the knob 6 90° in the opposite direction. The knob 6 causes the lock cylinder 4 and lock cylinder sleeve 3 to rotate together. The locking plate 5 at the tail of the lock cylinder 4 then flips 90° and protrudes above the surface of the flip cover 2, locking into the housing part of the box body 1, preventing the flip cover 2 from flipping outward. At this time, the tip of the positioning block 9 is locked into the positioning groove 31 at the head of the lock cylinder sleeve 3 under the action of the elastic element. At the same time, the locking groove 32 at the tail of the lock cylinder sleeve 3 aligns with the iron core of the electronic control actuator 8. The iron core pops out under the push of the internal spring and locks into the locking groove 32, achieving locking. The knob 6 cannot be rotated.

[0052] 2. Mechanical Key Opening: Insert the matching mechanical key into the keyhole of knob 6 until the key reaches the bottom of lock cylinder 4. At this time, the blades on lock cylinder 4 retract under the pressure of the key teeth, disengaging them from lock cylinder sleeve 3. The user rotates knob 6 90°, which drives lock cylinder 4 to rotate independently. The locking plate 5 at the tail of lock cylinder 4 rotates 90° and descends to a position below the door frame of box 1. At this time, flip cover 2 can be opened outwards, allowing the user to store and retrieve items.

[0053] Locking Operation: Close the flip cover 2 and rotate the knob 6 90° in the opposite direction. The knob 6 rotates the lock cylinder 4 and the locking plate 5 90°, causing the locking plate 5 to rise above the surface of the flip cover 2 and engage with the housing part of the box 1, preventing the flip cover 2 from flipping outward. After the key is removed, the blades on the lock cylinder 4 pop out under the action of the internal spring and re-engage with the blade grooves of the lock cylinder sleeve 3, restoring the linkage between the lock cylinder 4 and the lock cylinder sleeve 3, and the knob 6 can no longer be turned.

[0054] 3. Emergency power supply activation: When the smart key box battery is depleted, a power bank can be connected to the USB charging port at the bottom of the box for temporary power supply, and then the electronic smart opening method can be used.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A smart key box, comprising a box body (1) and a flip cover (2) pivotally connected to the box body (1), characterized in that: The flip cover (2) is provided with a lock cylinder mechanism, which includes a lock cylinder sleeve (3) and a lock cylinder (4) disposed therein and rotatable relative to it. The lock cylinder (4) and the lock cylinder sleeve (3) form a cooperative relationship that can be selectively in a linked state or a non-linked state. A locking plate (5) is connected to the inner end of the lock cylinder (4). The locking plate (5) is circumferentially linked with the lock cylinder (4) and can switch between the locked position and the unlocked position by rotating with the lock cylinder (4). In the locked position, the locking plate (5) is inserted into the box body (1) to lock the flip cover (2). In the unlocked position, the locking plate (5) is disengaged from the box body (1) to allow the flip cover (2) to be opened. The outer side of the flip cover (2) is provided with a knob (6) that is circumferentially linked with the lock cylinder (4), and the knob (6) has a keyhole leading to the lock cylinder (4); The flip cover (2) is also provided with: - Intelligent control motherboard (7), configured to receive and verify unlocking commands of at least one electronic authentication method; - An electronically controlled actuator (8) is electrically connected to the intelligent control motherboard (7) and is used to selectively lock or release the lock cylinder sleeve (3); in, When mechanically unlocking, the key is inserted into the lock cylinder (4) through the keyhole, so that the lock cylinder (4) and the lock cylinder sleeve (3) are in the non-linkage state. At this time, the knob (6) is turned to drive the lock cylinder (4) to rotate alone, thereby driving the locking plate (5) to rotate to the unlock position. When the smart lock is unlocked, after the smart control motherboard (7) verifies the lock, it controls the electronic control execution component (8) to release the lock cylinder sleeve (3), so that the lock cylinder (4) and the lock cylinder sleeve (3) are in the linkage state. At this time, turning the knob (6) can drive the lock cylinder (4), the lock cylinder sleeve (3) and the locking plate (5) to rotate synchronously to the unlock position.

2. The smart key box according to claim 1, characterized in that: The lock cylinder (4) and the lock cylinder sleeve (3) are connected by a blade structure. When a matching key is inserted, the blade on the lock cylinder (4) retracts, allowing it to rotate independently of the lock cylinder sleeve (3). When the key is pulled out, the blade pops out and causes the lock cylinder (4) and the lock cylinder sleeve (3) to move in circumferentially.

3. The smart key box according to claim 1, characterized in that: The circumferential head of the lock cylinder sleeve (3) is provided with one or more positioning grooves (31); the flip cover (2) is provided with a positioning component, which includes a positioning block (9) with a pointed end and an elastic element that forces the pointed end to be inserted into the positioning groove (31) for positioning the rotation of the lock cylinder sleeve (3).

4. The smart key box according to claim 3, characterized in that: The positioning grooves (31) are four in number and arranged at 90° intervals, so that the rotation of the lock cylinder sleeve (3) is limited to a 90° rotation.

5. The smart key box according to claim 1, characterized in that: The electronically controlled actuator (8) is an electromagnet. Its iron core pops out and gets stuck in the locking groove (32) at the tail of the lock cylinder sleeve (3) when it is locked. After receiving the signal from the intelligent control motherboard (7), it attracts the iron core to disengage from the locking groove (32) and release the lock cylinder sleeve (3).

6. The smart key box according to claim 1, characterized in that: The flip cover (2) includes a flip cover bracket (11) and a flip cover body (12) disposed on the flip cover bracket (11); the flip cover body (12) is provided with a knob hole (15), and a barrel-shaped cavity (16) extends inward from the knob hole (15) to accommodate the knob (6), the lock cylinder (4) and the lock cylinder sleeve (3); an installation cavity (17) is provided on each side of the barrel-shaped cavity (16) to install the positioning component and the electronic control execution component (8) respectively, and the installation cavity (17) and the barrel-shaped cavity (16) are connected by a slot.

7. The smart key box according to claim 1, characterized in that: The flip cover (2) has a lock cylinder hole (18) on the upper part of the flip cover bracket (11), and part of the lock cylinder hole (18) is a fan-shaped large hole (20); the tail of the lock cylinder (4) is provided with a square boss (21), which extends out of the lock cylinder hole (18); the locking plate (5) is fastened to the square boss (21) at the tail of the lock cylinder (4) by screws.

8. The smart key box according to claim 7, characterized in that: The lock cylinder sleeve (3) is provided with an arc-shaped block (19), which is engaged in the large fan-shaped hole (20) to limit the rotation angle of the lock cylinder sleeve (3) to 90°.

9. The smart key box according to claim 1, characterized in that: The electronic authentication methods supported by the intelligent control motherboard (7) include at least one of the following: password authentication, fingerprint authentication, mobile APP remote control authentication, and temporary password authentication.

10. The smart key box according to claim 1, characterized in that: A dust cover (14) is detachably connected to the keyhole of the knob (6).

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