A keychain that self-destructs upon cutting and a management system

Abstract

The present invention discloses a keychain that self-destructs upon being cut and a management system, which includes a housing, a first exposed wire, and a PCBA main board. The first exposed wire passes through the housing and is connected to the PCBA main board. The IC card, induction coil, and fuse in the PCBA main board form an induction circuit. Under normal circumstances, when the keychain approaches the magnetic field of the card reader in the management cabinet, the RFID chip information can be read. When the first exposed wire is cut, the MOS transistor is instantaneously turned on, causing a large current to burn out the fuse, resulting in the disconnection of the induction circuit and a change in the inductive impedance of the circuit. At this time, when the keychain approaches the magnetic field of the card reader, the internal information cannot be read, that is, when the key and the keychain are separated, the key cannot be returned. This avoids the situation where during use, the user may separate the keychain from the key and only return the keychain.

Description

Technical Field

[0001] The present invention relates to the technical field of key management, and in particular to a keychain that self-destructs when cut and a management system thereof. Background Art

[0002] In order to better manage the use of keys in various institutions, radio frequency card readers have been generally installed in current key storage cabinets, and radio frequency keychains have been installed on each key to determine whether the key is in place. During the process of using the key, biometric recognition is combined to open the storage cabinet to realize functions such as discriminating the key user and managing the usage time. However, in actual application, there are often situations where the user separates the keychain from the key and only returns the keychain while the key is lost, which brings great inconvenience to key management. There is no mature solution in the prior art to solve the above problems.

[0003] For example, Chinese Patent CN201910107876.9 discloses a key management box, a keychain, a key management device and a key management method. The keychain includes a housing and a locking ring. A locking hole is provided on the housing, and the locking ring is strung with keys and both ends are clamped in the locking hole. The keychain is characterized in that a locking device for locking the locking ring is provided inside the housing, and a keychain control main board is also provided. The keychain control main board is connected to the locking device and controls the locking activity of the locking device. The locking device includes a motor, and the output end of the motor is connected with a locking buckle and / or a locking piece. A card slot is provided at the end of the locking ring, and the motor controls the buckle and / or the locking piece to be stuck into the card slot for locking. The keychain control main board is connected to the motor and controls the motor to work. This invention mainly solves the safety problem of the key management device, still fails to integrate the keychain and the key according to requirements, and there is still a problem that the user may separate the keychain from the key and only return the keychain, resulting in the loss of the key. Summary of the Invention

[0004] The present invention mainly solves the technical problem that in the process of using the existing keychain, the user may separate the keychain from the key, only return the keychain, resulting in the loss of the key, and it is impossible to ensure the integration of the keychain and the key according to requirements, resulting in inconvenient management. A keychain that self-destructs when cut and a management system thereof are proposed. When the first exposed wire passes through the key and is connected to the PCBA main board arranged inside the keychain housing, when the first exposed wire is cut, that is, when the key and the keychain are separated, the keychain approaches the magnetic field of the card reader, that is, when approaching the management cabinet, the internal information cannot be read, ensuring that the key and the keychain are always integrated during use, otherwise it cannot be returned.

[0005] The present invention mainly solves the above technical problems through the following technical solutions: A keychain that self-destructs when cut, comprising a housing, a first exposed wire, and a PCBA main board. The first exposed wire passes through the housing and is connected to the PCBA main board. The PCBA main board includes a first power supply, an induction coil, a fuse, a MOS transistor, a diode, a resistor, a connector, a capacitor, and an IC card. The positive pole of the first power supply is respectively connected to the drain of the MOS transistor and one end of the resistor. The gate of the MOS transistor is respectively connected to the other end of the resistor and the first pin of the connector. The source of the MOS transistor is connected to the positive pole of the diode. The negative pole of the diode is respectively connected to one end of the fuse, the second pin of the connector, and one end of the capacitor. The other end of the fuse is respectively connected to the negative pole of the first power supply and one end of the induction coil. The other end of the induction coil is connected to the other end of the capacitor. The IC card is connected to both ends of the capacitor. Both ends of the first exposed wire are respectively connected to the first pin and the second pin of the connector.

[0006] In the present invention, the IC card, the induction coil, and the fuse form an induction loop. Under normal circumstances, when the keychain approaches the magnetic field of the card reader of the management cabinet, the RFID chip information can be read. When the first exposed wire is cut, the MOS transistor conducts instantaneously, causing a large current to burn out the fuse, resulting in the disconnection of the induction loop and a change in the inductive impedance of the loop. At this time, when the keychain approaches the magnetic field of the card reader, the internal information cannot be read, that is, when the key and the keychain are separated, the key cannot be returned. The management cabinet can also immediately send a warning message to notify the administrator when the specified allowable usage time arrives, which can avoid the situation where the keychain is returned but the key is not.

[0007] Preferably, the keychain further includes a wire-winding rotor, which includes a wire-winding handle and a fixed seat. The wire-winding handle is rotatably connected to the housing, and the fixed seat is fixedly connected to the housing. There is a wire-winding hole between the wire-winding handle and the fixed seat. The first exposed wire passes through the wire-winding hole, and the wire-winding handle and the fixed seat fix the first exposed wire inside the housing through the wire-winding hole. The first exposed wire passes through the key, through the housing, and is inserted into the wire-winding hole inside the wire-winding rotor. Twist the wire-winding handle, and the wire-winding hole becomes narrower, thereby firmly fixing the first exposed wire inside the keychain.

[0008] Preferably, the wire-winding handle is provided with anti-reverse teeth, and the housing is provided with anti-reverse teeth that cooperate with the anti-reverse teeth. It can ensure that when the wire-winding handle is tightened, the first exposed wire will not loosen inside the keychain, improving the stability of the overall circuit.

[0009] Preferably, the keychain further includes a cover. Both ends of the outer shell are open, and the cover is provided on the other side relative to the winding rotor and fixedly connected to the outer shell. While facilitating the maintenance of the keychain, it can prevent the components inside the keychain from falling off.

[0010] Preferably, the MOS transistor is an N-channel MOS transistor, and the resistor is a current-limiting pull-up resistor.

[0011] Preferably, the IC card is a Fudan Microelectronics FM11RF08 non-contact logic encryption chip.

[0012] Preferably, the first power source is a CR1220 lithium manganese dioxide battery.

[0013] Preferably, the keychain further includes a positioning device, a communication device, a second power source, and a second exposed wire. The second exposed wire passes through the outer shell and is connected in series with the positioning device, communication device, and second power source provided inside the keychain. The keychain sends the position information in the positioning device to the key cabinet management system through the communication device. Similarly, when the second exposed wire is cut off, the key cabinet management system will not be able to receive the position information of the corresponding keychain.

[0014] The present invention also provides a management system for a keychain that is destroyed when cut, including a key cabinet and a background server. The background server sets a specified usage time and a maximum usage time for the keys in the key cabinet. When a keychain in the key cabinet is taken out for use, the background server monitors the position of the used keychain in real time through the positioning device and the communication device, and sets a period T. The position information of the used keychain is recorded every time the time T elapses. When the time that the keychain leaves the key cabinet exceeds the specified usage time, the recording period T is adjusted to T / 2; when the time that the keychain leaves the key cabinet exceeds the maximum usage time, the background server issues an alarm to the management personnel; when the position information of the keychain is not normally recorded within the specified period, that is, when the second exposed wire is cut off, the power supplies of the communication device and the positioning device of the keychain are disconnected, and the background server issues an alarm to the management personnel. The possible position where the keychain and the key are separated can be judged based on the recently recorded position information combined with the information of the user.

[0015] The present invention has the following beneficial effects: The structure is simple, ensuring that the key and the keychain are always integrated during use, otherwise it cannot be returned; the first exposed wire for passing through the key is firmly connected inside; the safety and convenience of the key cabinet management system are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the keychain in an embodiment of the present invention.

[0017] Figure 2It is a circuit schematic diagram of the PCBA main board in the embodiment of the present invention.

[0018] In the figure: 1. Outer shell, 2. First exposed wire, 3. PCBA main board, 31. Induction coil, 41. Reel handle, 42. Fixed seat, 43. Reel hole, 5. Sealing cover. Specific implementation mode

[0019] The following uses specific specific examples to illustrate the implementation mode of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0020] Embodiment 1:

[0021] A keychain that is destroyed when cut includes an outer shell 1, a first exposed wire 2, and a PCBA main board 3. The first exposed wire 2 passes through the outer shell 1 and is connected to the PCBA main board 3. The PCBA main board 3 includes a first power supply U1, an induction coil 31, a fuse FUSE, a MOS transistor Q1, a diode D1, a resistor R1, a connector CN1, a capacitor C1, and an IC card U2. The positive pole of the first power supply is respectively connected to the drain of the MOS transistor and one end of the resistor. The gate of the MOS transistor is respectively connected to the other end of the resistor and the first pin of the connector. The source of the MOS transistor is connected to the positive pole of the diode. The negative pole of the diode is respectively connected to one end of the fuse, the second pin of the connector, and one end of the capacitor. The other end of the fuse is respectively connected to the negative pole of the first power supply and one end of the induction coil. The other end of the induction coil is connected to the other end of the capacitor. The IC card is connected to both ends of the capacitor. Both ends of the first exposed wire are respectively connected to the first pin and the second pin of the connector. In this embodiment, the keychain further includes a reel rotor. The reel rotor includes a reel handle 41 and a fixed seat 42. The reel handle is rotatably connected to the outer shell. The fixed seat is fixedly connected to the outer shell. There is a reel hole 43 between the reel handle and the fixed seat. The first exposed wire passes through the reel hole. The reel handle and the fixed seat fix the first exposed wire inside the outer shell through the reel hole. The reel handle is provided with anti-reverse teeth. The outer shell is provided with anti-reverse teeth that cooperate with the anti-reverse teeth. The keychain further includes a sealing cover 5. Both ends of the outer shell are open. The sealing cover is arranged on the other side relative to the reel rotor and is fixedly connected to the outer shell. While facilitating the maintenance of the keychain, it can prevent the components inside the keychain from falling off. The MOS transistor is an N-channel MOS transistor. The resistor is a current-limiting pull-up resistor. The IC card is a Fudan Micro FM11RF08 non-contact logic encryption chip. The first power supply is a CR1220 lithium manganese dioxide battery.

[0022] During use, the first exposed wire in the present invention passes through the key, passes through the housing, and is inserted into the winding hole inside the winding rotor. By turning the winding handle, the winding hole becomes narrower, thereby firmly fixing the first exposed wire inside the keychain. The IC card, induction coil, and fuse in the keychain form an induction circuit. Under normal circumstances, when the keychain approaches the magnetic field of the card reader in the management cabinet, the RFID chip information can be read. When the first exposed wire is cut, the MOS transistor conducts instantaneously, causing a large current to burn out the fuse, resulting in the disconnection of the induction circuit and a change in the inductive impedance of the circuit. At this time, when the keychain approaches the magnetic field of the card reader, the internal information cannot be read, that is, when the key and the keychain are separated, the key cannot be returned. The management cabinet can also send a warning message to the administrator immediately when the specified allowed use time arrives, which can avoid the situation where the keychain is returned but the key is not.

[0023] Embodiment 2:

[0024] The difference between this embodiment and Embodiment 1 is that the keychain further includes a positioning device, a communication device, a second power supply, and a second exposed wire. The second exposed wire passes through the housing and is connected in series with the positioning device, communication device, and second power supply provided inside the keychain. The second exposed wire and the first exposed wire are insulated from each other and together form a plastic-coated wire passing through the key. The keychain sends the position information in the positioning device to the key cabinet management system through the communication device. Similarly, when the second exposed wire is cut, the key cabinet management system will not be able to receive the position information of the corresponding keychain. The present invention also provides a management system for a keychain that self-destructs when cut, including a key cabinet and a background server. The background server sets a specified use time and a maximum use time for the keys in the key cabinet. When a keychain in the key cabinet is taken out for use, the background server monitors the position of the used keychain in real time through the positioning device and the communication device, and sets a period T. The position information of the used keychain is recorded every time T passes. When the time that the keychain leaves the key cabinet exceeds the specified use time, the recording period T is adjusted to T / 2; when the time that the keychain leaves the key cabinet exceeds the maximum use time, the background server issues an alarm to the management personnel; when the position information of the keychain cannot be normally recorded within the specified period, that is, when the second exposed wire is cut, the power supply of the communication device and the positioning device of the keychain is disconnected, and the background server issues an alarm to the management personnel. The possible position where the keychain and the key are separated can be judged based on the recently recorded position information combined with the information of the user.

[0025] The above-described embodiments are only preferred implementation schemes of the present invention, and do not impose any form of limitation on the present invention. There are other variations and modifications without exceeding the technical solutions described in the claims.

Claims

1. A keychain that self-destructs upon being cut, characterized in that, It includes a housing, a first exposed wire, and a PCBA main board. The first exposed wire passes through the key and is fixed at both ends inside the key ring. The first exposed wire passes through the housing and is connected to the PCBA main board. The PCBA main board includes a first power supply, an induction coil, a fuse, a MOS transistor, a diode, a resistor, a connector, a capacitor, and an IC card. The positive pole of the first power supply is respectively connected to the drain of the MOS transistor and one end of the resistor. The gate of the MOS transistor is respectively connected to the other end of the resistor and the first pin of the connector. The source of the MOS transistor is connected to the positive pole of the diode. The negative pole of the diode is respectively connected to one end of the fuse, the second pin of the connector, and one end of the capacitor. The other end of the fuse is respectively connected to the negative pole of the first power supply and one end of the induction coil. The other end of the induction coil is connected to the other end of the capacitor. The IC card is connected to both ends of the capacitor. Both ends of the first exposed wire are respectively connected to the first pin and the second pin of the connector. When the first exposed wire is cut, the MOS transistor conducts, the current burns out the fuse, and the induction circuit is disconnected, so that the information inside the key ring cannot be read.

2. The keychain that is destroyed upon shearing according to claim 1, wherein It further includes a wire-winding rotor, which includes a wire-winding handle and a fixed seat. The wire-winding handle is rotatably connected to the housing, and the fixed seat is fixedly connected to the housing. There is a wire-winding hole between the wire-winding handle and the fixed seat. The first exposed wire passes through the wire-winding hole, and the wire-winding handle and the fixed seat fix the first exposed wire inside the housing through the wire-winding hole.

3. The keychain that is destroyed upon shearing according to claim 2, wherein, The wire-winding handle is provided with anti-reverse teeth, and the housing is provided with anti-reverse teeth that cooperate with the anti-reverse teeth.

4. A keychain that is destroyed upon being cut, according to claim 2 or 3, characterized in that It further includes a cover. Both ends of the housing are open, and the cover is arranged on the other side relative to the wire-winding rotor and is fixedly connected to the housing.

5. A keychain that is destroyed upon being cut, as claimed in claim 1, wherein The MOS transistor is an N-channel MOS transistor, and the resistor is a current-limiting pull-up resistor.

6. The keychain that is destroyed upon being cut, as claimed in claim 1, is characterized in that The IC card is a Fudan Microelectronics FM11RF08 non-contact logic encryption chip.

7. A keychain that is destroyed upon being cut, as described in claim 1, wherein The first power supply is a CR1220 lithium manganese dioxide battery.

8. A keychain that is destroyed upon cutting, as claimed in claim 1 or 2 or 3, characterized in that It further includes a positioning device, a communication device, a second power supply, and a second exposed wire. The second exposed wire passes through the housing and is connected in series with the positioning device, the communication device, and the second power supply arranged inside the housing.

9. A management system for a keychain that self-destructs upon being cut, based on the keychain that self-destructs upon being cut described in claim 8, characterized in that, It includes a key cabinet and a background server. The background server sets a specified usage time and a maximum usage time for the keys in the key cabinet. When the key ring in the key cabinet is taken out for use, the background server monitors the position of the used key ring in real time through the positioning device and the communication device, and sets a recording period T. The position information of the used key ring is recorded every time the time T elapses. When the time that the key ring leaves the key cabinet exceeds the specified usage time, the period T is adjusted to T / 2; when the time that the key ring leaves the key cabinet exceeds the maximum usage time, the background server issues an alarm to the administrator; when the position information of the key ring is not normally recorded within the specified period, the background server issues an alarm to the administrator.

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