Intelligent key bolt capable of sending position information in real time

Abstract

The utility model relates to an intelligent key bolt capable of sending position information in real time, and belongs to the technical field of intelligent key management equipment. The key points of the technical scheme are as follows: the mobile phone comprises a shell made of a non-metallic material, and a circuit board integrated with a 4G + positioning module, an antenna, a charging circuit, a battery and a communication circuit is packaged in the shell. The charging circuit is connected with the battery, and automatic charging is achieved by establishing electric contact when the key bolt is inserted into the key cabinet. The 4G + positioning module generates positioning data according to a preset time interval after the key bolt is separated from the key cabinet; and the communication circuit transmits the positioning information to an upper computer or a background system through the antenna. The device is mainly used for monitoring the key storing and taking position in real time and is particularly suitable for scenes such as property management, vehicle renting and equipment management needing to accurately track the key use state, the signal shielding phenomenon is effectively avoided through the design of the non-metal shell, and the high-precision continuous positioning function is achieved in cooperation with the 4G + communication technology.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of intelligent key management equipment. More specifically, the utility model relates to an intelligent key bolt capable of sending real-time position information. BACKGROUND

[0002] In traditional key management equipment, the key bolt, as the core component of physical access control, is usually designed with a mechanical structure to realize the fixation and use of the key. However, with the complication of key management scenarios, the existing key bolt gradually shows limitations in function. Specifically, the existing key bolt generally lacks real-time position tracking capability, and its position information can only be passively recorded through manual registration or fixedly installed read-write equipment (such as an RFID inductor). When the key bolt leaves the preset management area (such as a key cabinet or a fixed sensing point), the actual use position, movement trajectory, and state of the key cannot be remotely monitored, making it difficult to trace back in time when the key is lost or misused. This problem is due to the functional positioning of the traditional key bolt being limited to physical access control, without integrating active communication and positioning modules, thus failing to meet the dynamic management requirements.

[0003] In addition, the shell material selection of the existing key bolt has inherent defects. To meet the mechanical strength and durability requirements, most key bolts are made of metal materials (such as stainless steel or aluminum alloy) to manufacture the shell. However, metal materials have a significant shielding effect on electromagnetic signals, and if a wireless communication module (such as a GPS or cellular network module) is integrated inside the key bolt, the signal transmission efficiency will be significantly reduced due to the shielding of the shell, resulting in failure or delay in uploading positioning data. In terms of power supply, the key bolt with simple electronic functions (such as an RFID chip) in the existing technology usually relies on passive power supply or disposable batteries, which cannot support long-term and high-frequency positioning data collection and transmission.

[0004] In summary, the existing key bolt technology is difficult to meet the demand for real-time position monitoring of keys in dynamic scenarios due to its single function, material limitations, and power supply bottlenecks. UTILITY MODEL CONTENT

[0005] An object of the utility model is to provide an intelligent key bolt capable of sending real-time position information to at least solve the above problems.

[0006] In order to realize the purpose and other advantages of the utility model, a kind of intelligent key bolt that can send position information in real time is provided, comprising: shell, which is made of non-metal material;Circuit board, which is encapsulated in the shell, 4G+ positioning module, antenna, charging circuit, battery and communication circuit are integrated on the circuit board;Wherein, the charging circuit is connected with the battery, for charging the battery when key bolt is inserted into key cabinet;The 4G+ positioning module is configured to send positioning information at preset time interval after key bolt leaves key cabinet;The communication circuit is connected with the 4G+ positioning module and antenna respectively, for obtaining the positioning information sent by the 4G+ positioning module and transmitting to upper computer or background system through antenna.

[0007] Preferably, a low-power control module is also integrated on the circuit board, which is connected with the 4G+ positioning module, for reducing the running frequency of 4G+ positioning module when key bolt is in static state.

[0008] Preferably, the low-power control module is built-in with acceleration sensor and timer, the acceleration sensor is used for monitoring three-axis acceleration data of key bolt in real time, and the timer is configured to determine that key bolt is in static state when acceleration change amplitude detected by the acceleration sensor continuously falls below preset threshold and lasts more than first preset time.

[0009] Preferably, the 4G+ positioning module includes GPS module, Beidou module or combination of both.

[0010] Preferably, the charging circuit is wireless charging circuit, and the key cabinet is provided with wireless charging emission end matched with the wireless charging circuit.

[0011] Preferably, the front end of the key bolt is provided with a plurality of metal contacts, the plurality of metal contacts are arrayed and sequentially divided into three groups from left to right, including charging contact group and data communication contact group arranged on both sides, and anti-interference isolation contact group arranged in the middle;The charging contact group is in physical contact with the charging interface arranged in the key cabinet, for wired fast charging of the battery;The data communication contact group supports USB 3.0 protocol, for establishing physical connection with key cabinet to download firmware update or upload encrypted log data;The anti-interference isolation contact group adopts ceramic cladding structure, for eliminating electromagnetic crosstalk between charging contact and data communication contact.

[0012] Preferably, the surface of the plurality of metal contacts is covered with nano-hydrophobic coating.

[0013] Preferably, the front end of the key lock is also provided with four positioning protrusions, which are symmetrically arranged on the front and rear sides of the plurality of metal contact areas, each positioning protrusion is inserted into a corresponding positioning groove arranged in the key cabinet, and the positioning protrusions protrude from the plurality of metal contacts.

[0014] Preferably, the communication circuit supports 4G, 5G or Bluetooth communication protocol.

[0015] Preferably, the shell is a flat half-elliptical structure, the front end is a flat structure, the rear end is a curved structure, the rear end is provided with an opening penetrating through the front and rear sides, the opening is provided with an anti-slip protrusion between the opening and the front end, and the left and right sides of the shell are provided with grooves for accommodating the thumb and index finger near the front end.

[0016] The utility model at least includes following beneficial effects:

[0017] Firstly, the intelligent key lock solves the problem of electromagnetic signal shielding of metal materials by adopting a non-metallic shell (such as engineering plastic or composite material), ensuring the signal transmission stability of the internal antenna and the 4G+ positioning module. The non-metallic shell meets the requirements of lightweight and mechanical strength, avoiding the positioning failure or communication delay of traditional metal key locks caused by electromagnetic shielding. The design of the circuit board integrated with the charging circuit and the battery can automatically charge when the key lock is inserted into the key cabinet, ensuring the long-term endurance of the equipment; the 4G+ positioning module sends positioning information at a preset time interval, and realizes real-time position monitoring combined with the communication circuit and the antenna, effectively solving the problem that the traditional key lock cannot be tracked after it is separated from the management area. The overall structure is compact and suitable for high-frequency plugging scenes.

[0018] Secondly, the low-power control module dynamically adjusts the operating frequency of the 4G+ positioning module to reduce power consumption when the key lock is stationary. For example, when the key is not used, the uploading frequency of positioning data is reduced or the key lock enters sleep mode, significantly prolonging the battery life. This design overcomes the frequent charging problem caused by the continuous high-power operation of traditional key locks, especially suitable for long-term offline use scenarios, while balancing the contradiction between real-time positioning and energy consumption.

[0019] Thirdly, the cooperative work of the acceleration sensor and the timer can accurately judge the motion state of the key lock. By monitoring the three-axis acceleration change amplitude and duration, false judgments caused by short-term stationary or slight vibration are avoided, ensuring that the low-power mode is activated only when the key lock is stationary for a long time. For example, when the key is placed on the table for a short time, the normal positioning frequency is maintained, and the power consumption is automatically reduced after a long time of non-movement. This scheme optimizes the energy consumption control logic and improves the power management efficiency.

[0020] Fourth, compatible GPS and Beidou dual-mode positioning technology, enhanced positioning coverage and reliability. In a single satellite signal weakening or shielding (such as indoor, tunnel), the dual-mode system can automatically switch to the available signal source, improve the success rate of positioning in complex environments. In addition, multi-mode positioning can combine the data differences of the two systems to correct errors and improve the accuracy of location information to meet the needs of high-demand scenarios (such as vehicle scheduling or device tracking).

[0021] Fifth, wireless charging circuit through non-contact energy transmission, avoid the traditional contact charging due to oxidation, pollution or mechanical wear caused by poor contact problem. Key plug inserted into the key cabinet automatically aligns the charging coil, no need to accurately align the physical interface, simplify the operation process and improve the charging reliability. Wireless charging also reduces the number of exposed contacts of the key plug, reduces the risk of failure caused by contact corrosion, and prolongs the service life of the device.

[0022] Sixth, the design of the grouped metal contacts realizes functional isolation and electromagnetic compatibility optimization. The symmetrical distribution of charging contacts ensures the stability of contact and supports fast charging; data communication contacts use USB 3.0 protocol to improve firmware update and log transmission efficiency; anti-interference isolation contacts block electromagnetic interference between charging and data contacts through ceramic coating, avoiding interference of high-current charging on data transmission. This structure realizes high-density integration of multifunctional interface in limited space while ensuring the independence and reliability of each function.

[0023] Seventh, nano-hydrophobic coating can effectively prevent oxidation or short circuit of metal contacts caused by moisture, dust or liquid splashing. The coating reduces the surface energy, making it difficult for water stains or dirt to adhere, keeping the contacts clean and stable in conductivity. For example, in outdoor or high-humidity environments, the contacts can still maintain low contact resistance, reducing the risk of charging or communication interruption, and improving the durability of the device in harsh environments.

[0024] Eighth, the insertion of the positioning bump and the key cabinet groove realizes the physical guiding function, ensuring the precise docking of the key plug when inserted. The design of the bump protruding from the contact area can contact the cabinet body first during insertion and removal, avoiding mechanical damage caused by direct collision or misalignment of metal contacts. In addition, the symmetrical distribution of the bumps provides uniform insertion force feedback, simplifying user operation and reducing the risk of misinsertion, prolonging the service life of the contacts.

[0025] Ninth, multi-protocol communication circuit supports flexible switching of 4G, 5G or Bluetooth communication. For example, switch to Bluetooth direct connection with the key cabinet when 4G signal is weak to ensure that positioning data is not lost; 5G module is suitable for high-bandwidth demand scenarios (such as real-time track upload). This design adapts to different network environments, avoids transmission interruption caused by insufficient signal coverage of a single communication mode, and improves the environmental adaptability and data reliability of the system.

[0026] Tenth, the flat half-elliptical shell is combined with ergonomic groove design, and comfort and operation convenience are optimized. The front end plane is convenient for aligning with the key cabinet interface, the rear end opening design is convenient for receiving through the key ring, the anti-skid convex increases the friction force, and the slipping during plugging is prevented. The left and right grooves of the shell guide the thumb and index finger to naturally fit, and the plug is convenient for plugging. The compact shape is also beneficial to the storage and management of the key in a small space (such as a key ring or a tool bag).

[0027] Other advantages, objects and features of the present application will be apparent from the following description, and will be understood by those skilled in the art upon reading and understanding the specification. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the overall structure schematic diagram of the key plug of another embodiment of the present application.

[0029] BRIEF DESCRIPTION OF DRAWINGS: shell 1, charging contact 2, data communication contact 3, anti-interference isolation contact 4, positioning convex block 5, opening 6, anti-skid convex 7, groove 8. DETAILED DESCRIPTION

[0030] The present application will be further described in detail below with reference to the embodiments and drawings, so that those skilled in the art can implement the present application according to the description.

[0031] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0032] It should be noted that the experimental methods in the following embodiments are all conventional methods, and the reagents and materials can be obtained from commercial channels unless otherwise specified; in the description of the present application, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application.

[0033] As Figure 1As shown, in an embodiment of the present application, the intelligent key bolt is composed of a non-metallic shell 1, an internal circuit board, a charging circuit, a 4G+ positioning module, a battery and a communication circuit. The non-metallic shell 1 is usually made of engineering plastic or carbon fiber composite material, which has the characteristics of light weight and anti-electromagnetic shielding. The charging circuit is connected with the battery, and charging is realized through the connection established when the key bolt is inserted into the key cabinet, and the battery supplies power to the circuit board; the 4G+ positioning module integrates GPS or Beidou module, which is used to generate positioning data; the communication circuit cooperates with the antenna to transmit data to the host computer or the background system.

[0034] Specifically, the shell 1 adopts a semi-elliptical flat design, the front end plane is convenient for aligning with the key cabinet interface, and the rear curved surface is provided with a through opening 6 for connecting the key ring. The circuit board is packaged in the shell 1, and the charging circuit thereof can include a charging contact 2, which is in contact with the interface in the cabinet when the key bolt is inserted into the key cabinet, and the battery is quickly charged through wired charging to supplement the power. The 4G+ positioning module generates positioning data at a preset time interval (such as every 30 seconds) after the key bolt is separated from the key cabinet, and transmits the data to the host computer or the background system through the communication circuit and the antenna. The communication circuit supports 4G / 5G protocol to ensure real-time transmission of positioning information. The positioning bumps 5 symmetrically distributed on the front end of the key bolt are inserted into the key cabinet groove to ensure accurate butt joint of the contact and avoid mechanical damage during plugging and unplugging.

[0035] In this embodiment, the non-metallic shell 1 avoids the shielding of electromagnetic signals by metal materials, ensuring the signal stability of the positioning module and the antenna; the charging circuit design prolongs the battery life; the cooperative work of the 4G+ positioning module and the communication circuit enables the key bolt to still upload real-time location information after being separated from the key cabinet, solving the pain point that the traditional key bolt cannot be remotely tracked; the grouping design of the positioning bumps 5 and the metal contacts 2 improves the plugging reliability and service life.

[0036] Further, the preset time interval can be dynamically adjusted through the host computer software or the background system. The host computer software or the background system can also generate the motion trajectory of the key bolt according to the uploaded location information.

[0037] In another embodiment of the present application, a low-power control module integrated on the circuit board is also included, which is connected with the 4G+ positioning module and used for dynamically adjusting the running frequency. The module reduces the positioning data acquisition frequency when the key bolt is static by monitoring the motion state of the key bolt, thereby reducing the energy consumption.

[0038] Specifically, the low-power control module works with software algorithm and hardware. When the key is taken out, the module receives the position data of the 4G+ positioning module in real time, and monitors the acceleration change of the device. If the key is in a moving state (such as being carried and used), the module maintains the high frequency operation of the positioning module (such as once per second); if a stationary state is detected (such as the key being placed on the desktop), the module reduces the positioning frequency to a preset low value (such as once every 5 minutes), or even enters the sleep mode. This process is realized through interrupt signal or clock pulse control, avoiding the additional power consumption caused by frequent wake-up.

[0039] In the embodiment, the low-power control module significantly reduces the energy consumption of the key in the idle state, prolonging the use time after a single battery charge. For example, the power consumption can be reduced by more than 60% within 8 hours when the key is not used. This design balances the real-time positioning and endurance requirements.

[0040] In another embodiment of the present application, the low-power control module is built-in with an acceleration sensor and a timer. The acceleration sensor is a three-axis MEMS device for real-time monitoring of the acceleration change of the key in the X, Y and Z axis directions; the timer is an embedded counter for counting the duration of the acceleration change. Both of them work together to determine whether the key is in a stationary state.

[0041] Specifically, the acceleration sensor samples three-axis data at a frequency of 100 Hz, and eliminates high-frequency noise through a low-pass filter. When the fluctuation amplitude of the sampling value is less than the preset threshold for 10 consecutive times, the timer starts to accumulate the stationary time. If the accumulated time exceeds a first preset value (such as 5 minutes), the low-power control module triggers a frequency reduction instruction to adjust the running frequency of the 4G+ positioning module to the sleep mode. If an acceleration mutation is detected during the period (such as the key being taken up again), the timer is reset and the high-frequency positioning is restored.

[0042] In the embodiment, through the dual judgment of acceleration and time, the false triggering caused by temporary stationary (such as temporary placement) is avoided, ensuring that the low-power mode is activated only when the key is idle for a long time. For example, the key is placed on the desktop for more than 5 minutes and automatically enters the sleep mode, while the positioning is restored immediately after a short movement, saving energy and not affecting the use experience.

[0043] In another embodiment of the present application, the 4G+ positioning module is a hardware unit supporting multiple satellite systems, which can simultaneously or selectively access GPS and Beidou signals, improving the positioning coverage range and reliability.

[0044] Specifically, the positioning module is built-in a dual-mode chip, which defaults to search for a GPS signal preferentially. When the GPS signal strength is lower than a threshold (such as -130 dBm), the dual-mode chip is switched to a Beidou system automatically. In a complex environment (such as an urban canyon), the module can receive data of the two systems in parallel, and the final coordinates are calculated through algorithm fusion (such as weighted average), so that the error range is reduced to within 2 meters. In addition, the module supports A-GPS technology, which uses base station assistance to quickly locate and reduce the cold start time.

[0045] In the embodiment, the dual-mode positioning enables the key to work stably when a single signal is blocked, for example, the Beidou signal is strong in an underground garage, and the key can be automatically switched to ensure the continuity of positioning. The data fusion technology improves the accuracy by 30%, which meets the high-precision demand scenarios of equipment management.

[0046] In another embodiment of the utility model, the charging circuit is a wireless charging circuit, which is based on the principle of electromagnetic induction and includes a receiving coil and a rectifier module. The key cabinet is provided with a transmitting coil, and non-contact energy transmission is realized through an alternating magnetic field.

[0047] Specifically, the receiving coil inside the key is embedded in the rear curved surface of the shell 1 and is aligned with the center of the transmitting coil in the cabinet. When the key is inserted into the key cabinet, the transmitting coil generates a 125 kHz alternating magnetic field, the receiving coil induces current, and the rectifier module converts the current into direct current to charge the battery. The charging efficiency is 75%, supports the Qi protocol, and the maximum power is 10W. The anti-interference isolation contact 4 uses a ferrite core to reduce the influence of electromagnetic leakage on the data communication contact 3 during charging.

[0048] In the embodiment, wireless charging avoids the problem of poor contact caused by oxidation of the contact, and the plug-in tolerance is improved to ±3mm. The charging efficiency is comparable to the wired solution, and there is no mechanical wear, which is suitable for high-frequency access scenarios (such as daily insertion and removal of more than 50 times for a property key cabinet).

[0049] In another embodiment of the utility model, the front end of the key is provided with a plurality of metal contacts, which are arranged from left to right and divided into three groups, including a charging contact group and a data communication contact group arranged on both sides, and an anti-interference isolation contact group arranged in the middle. The charging contact 2, the data communication contact 3 and the anti-interference isolation contact 4 respectively undertake the functions of charging, data transmission and electromagnetic isolation. The ceramic cladding structure is used to block the crosstalk between the contacts.

[0050] Specifically, the charging contacts 2 are made of copper alloy and are plated with gold, and are symmetrically distributed on both sides of the front end of the key bolt to support 5A large current fast charging; the data communication contacts 3 are arranged in the middle to support the USB 3.0 protocol and transmit firmware upgrade packages or log data through differential signal transmission; the anti-interference isolation contacts 4 are wrapped with ceramic material, the dielectric constant of which is higher than that of air, and can absorb high-frequency noise during charging. The spacing between the three groups of contacts is 1.5 mm, and the crosstalk is further reduced through PCB wiring isolation.

[0051] In the embodiment, the grouping of the contacts allows charging and data transmission to be mutually independent, and the actual measured USB 3.0 transmission rate during charging can still reach 300 MB / s; the ceramic coating reduces electromagnetic interference by 20 dB, thereby ensuring the stability of communication.

[0052] In another embodiment of the present application, the surfaces of the plurality of metal contacts are covered with a nano-hydrophobic coating. The nano-hydrophobic coating is made of fluorocarbon polymer material and is covered on the surface of the metal contact through a gas deposition process to reduce the surface energy and achieve water and dirt resistance.

[0053] Specifically, the surface of the contact is first plasma cleaned, and then a 50 nm thick hydrophobic coating is deposited in a vacuum environment. The contact angle of the coating is greater than 150°, which makes the water droplets roll in a bead shape and at the same time suppresses dust adhesion. The resistivity of the coating is less than 0.1 Ω·cm, which ensures that the conductivity is not affected.

[0054] In the embodiment, in an environment with a humidity of 90%, the coating can prevent the contact from oxidizing, and the contact resistance is stable within 5 mΩ; the dirt adhesion rate is reduced by 80%, which is suitable for outdoor or industrial environment use.

[0055] In another embodiment of the present application, the front end of the key bolt is further provided with four positioning protrusions 5. The positioning protrusions 5 are guide structures made of ABS plastic and are symmetrically distributed on the front end of the key bolt to form a plug-in fit with the key cabinet groove.

[0056] Specifically, the four positioning protrusions 5 have a trapezoidal cross section, and the height is 0.5 mm higher than that of the metal contacts, so that the protrusions preferentially contact the cabinet groove during plugging and guide the key bolt to be inserted in the correct direction. The gap between the protrusions 5 and the groove is 0.1 mm, which ensures smooth plugging and no shaking. The rear end curved hole 6 forms a mechanical balance with the protrusions 5, thereby reducing the stress concentration of the shell 1 during plugging.

[0057] In the embodiment, the positioning protrusions 5 increase the fault tolerance of the plugging operation by 50%, and the contact alignment success rate is close to 100%; the protrusion preferential contact design reduces the wear of the contacts and prolongs the service life to more than 100,000 times of plugging.

[0058] In another embodiment of the present application, the communication circuit is a multi-mode baseband chip that supports 4G, 5G and Bluetooth protocols and can automatically switch communication modes according to signal strength.

[0059] Specifically, the communication circuit incorporates a built-in RF front-end module, with the 4G / 5G antenna integrated into the top curved surface of housing 1, and the Bluetooth antenna positioned near the rear opening 6. When the 4G signal strength drops below -110dBm, the circuit automatically switches to Bluetooth mode, directly connecting to the gateway inside the key cabinet; if Bluetooth is unavailable, the 5G SA network is activated. The transmission protocol priority is 5G > 4G > Bluetooth, with a switching delay of less than 200ms.

[0060] In this embodiment, multi-mode communication ensures the reliability of data transmission in different environments. For example, when switching to Bluetooth mode in remote areas, the location data can still be uploaded through the key cabinet gateway with a packet loss rate of less than 0.1%.

[0061] In another embodiment of this utility model, the shell 1 has a semi-elliptical flat structure, with a planar front end and a curved rear end. The rear end is provided with an opening 6 that runs through both the front and rear sides. An anti-slip protrusion 7 is provided between the opening 6 and the front end. The left and right sides of the shell are provided with grooves 8 near the front end. The left and right grooves 8 are designed according to ergonomics to fit the grip curve of the thumb and index finger.

[0062] Specifically, the front surface of the casing matches the dimensions of the key cabinet interface. The left and right side grooves (8) are 2mm deep with a radius of curvature of 15mm, conforming to the gripping habits of adult fingers. The rear anti-slip protrusions (7) are made of silicone with a diamond-patterned surface to increase the coefficient of friction, thus achieving stable insertion and removal operations.

[0063] In this embodiment, the ergonomic design improves the comfort of holding with one hand by 40% and reduces the insertion and removal time to less than 1 second; the anti-slip protrusions 7 and grooves 8 work together to reduce the error rate, making it especially suitable for quick access to keys in emergency situations.

[0064] The number of devices and processing scale described herein are for simplification. Applications, modifications, and variations of the smart key chain capable of transmitting location information in real time according to this invention will be readily apparent to those skilled in the art.

[0065] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A smart key bolt capable of transmitting position information in real time, characterized by, The utility model relates to a key cabinet with 4G+ positioning function, comprising: a shell made of non-metallic material; a circuit board packaged in the shell, the circuit board being integrated with a 4G+ positioning module, an antenna, a charging circuit, a battery and a communication circuit; the charging circuit is connected with the battery and used for charging the battery when a key plug is inserted into the key cabinet; the 4G+ positioning module is configured to send positioning information at preset time intervals after the key plug leaves the key cabinet; the communication circuit is connected with the 4G+ positioning module and the antenna respectively and used for acquiring the positioning information sent by the 4G+ positioning module and transmitting the positioning information to an upper computer or a background system through the antenna.

2. The smart key bolt of claim 1, wherein, The circuit board is also integrated with a low-power control module connected with the 4G+ positioning module and used for reducing the running frequency of the 4G+ positioning module when the key plug is in a static state.

3. The smart key bolt of claim 2, wherein, The low-power control module is built-in with an acceleration sensor and a timer, the acceleration sensor is used for monitoring three-axis acceleration data of the key plug in real time, and the timer is configured to determine that the key plug is in a static state when the acceleration change amplitude detected by the acceleration sensor continuously falls below a preset threshold and lasts for more than a first preset time.

4. The smart key bolt of claim 1, wherein, The 4G+ positioning module comprises a GPS module, a Beidou module or a combination of the two.

5. The smart key bolt of claim 1, wherein, The charging circuit is a wireless charging circuit, and the key cabinet is provided with a wireless charging transmitting end matched with the wireless charging circuit.

6. The smart key bolt of claim 1, wherein, The front end of the key plug is provided with a plurality of metal contacts, the plurality of metal contacts are arranged in an array and sequentially divided into three groups from left to right, including a charging contact group and a data communication contact group arranged on both sides and an anti-interference isolation contact group arranged in the middle; the charging contact group is in physical contact with a charging interface arranged in the key cabinet and used for wired fast charging of the battery; the data communication contact group supports a USB 3.0 protocol and is used for establishing physical connection with the key cabinet to download firmware updates or upload encrypted log data; and the anti-interference isolation contact group adopts a ceramic cladding structure and is used for eliminating electromagnetic crosstalk between the charging contacts and the data communication contacts.

7. The smart key bolt of claim 6, wherein, The surface of the plurality of metal contacts is covered with a nano-hydrophobic coating.

8. The smart key bolt of claim 6, wherein, The front end of the key plug is also provided with four positioning bosses, which are symmetrically arranged on the front and back sides of the region of the plurality of metal contacts, each positioning boss is inserted and matched with a corresponding positioning groove arranged in the key cabinet, and the positioning boss protrudes from the plurality of metal contacts.

9. The smart key bolt of claim 1, wherein, The communication circuit supports 4G, 5G or Bluetooth communication protocols.

10. The smart key bolt of claim 1, wherein, The shell is a flat semi-elliptical structure, the front end of the shell is a planar structure, the rear end of the shell is a curved surface structure, the rear end is provided with an opening penetrating through the front and rear sides of the shell, an anti-slip protrusion is arranged between the opening and the front end, and recesses for accommodating the thumb and the index finger are arranged on the left and right sides of the shell close to the front end.

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