Key management device applied to extensible locking mechanism of electric power system

Abstract

The invention discloses a key management device of an extensible locking mechanism applied to an electric power system, which comprises a cabinet body, a key bin, extensible unlocking and locking mechanisms and an extension bus, and a plurality of extensible unlocking and locking mechanisms are cascaded through the extension bus. Each extensible unlocking and locking mechanism comprises a key chain identification circuit, an unlocking and locking identification circuit board, a lock pin control mechanism and a main control unit, and the shell is covered with an electromagnetic shielding layer and installed in the key bin through an installation support. The key chain identification circuit identifies a key chain through the RFID technology, the lock pin control mechanism controls a sliding lock pin through an electromagnet to achieve unlocking and locking of a key, and the unlocking and locking identification circuit board accurately identifies the position of the sliding lock pin through a photoelectric switch circuit so as to judge the state. The expansion bus is connected with the IDC socket of the mechanism in a plug-in mode through an IDC plug. Flexible expansion of the key management device is achieved, the state recognition precision and the anti-electromagnetic interference capacity are improved, installation and maintenance are convenient, and the key management device is suitable for key safety management requirements of electric power systems of different scales.

Description

Technical Field

[0001] This invention relates to the field of power system safety management technology, and specifically to a key management device for an expandable interlocking mechanism applied to a power system. Background Technology

[0002] During the operation of a power system, the management of operating keys for various power equipment (such as substation switches and distribution cabinets) is crucial, directly affecting the operational safety and standardization of the power system. Currently, most key management devices commonly used in power systems are designed with fixed compartments. The number and layout of their interlocking mechanisms are determined during the manufacturing stage, making it impossible to flexibly expand them according to the increase or decrease in the number of keys in actual application scenarios. This results in the need to add an entire set of management devices when the number of keys exceeds the device's design capacity, which not only increases equipment procurement costs and floor space but also increases the complexity of managing multiple devices collaboratively.

[0003] Existing key management devices rely heavily on mechanical contacts or single sensors to determine the lock / unlock status. This results in low accuracy and susceptibility to environmental interference (such as dust and electromagnetic interference), potentially leading to misjudgments of the key's lock / unlock status and causing security risks such as incorrect key extraction or missing key contacts. Furthermore, when multiple locking mechanisms work together, electromagnetic interference can easily occur between adjacent mechanisms, causing delays or abnormal actions in the lock pin control mechanism, further reducing the reliability of the key management device. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a key management device with scalable locking mechanism for power systems, which has scalability and high recognition accuracy.

[0005] Technical Solution: The present invention provides a key management device for an expandable locking mechanism applied to a power system, comprising a cabinet and a key compartment placed in the cabinet for storing keys, and further comprising multiple expandable locking / unlocking mechanisms disposed in the key compartment, including a key fob recognition circuit board for wirelessly identifying key fobs, a locking / unlocking recognition circuit board for determining whether the key fob is locked or unlocked, a lock pin control mechanism for unlocking and locking the key, and a main control unit, wherein an expansion bus cascades multiple expandable locking / unlocking mechanisms.

[0006] Preferably, the locking pin control mechanism includes a locking pin for locking the key fob, a sliding pin for controlling the locking / unlocking state of the key fob, a detection plate connected to the sliding pin and located above the locking / unlocking identification circuit board, and an electromagnet for controlling the sliding pin and the detection plate to be pulled in or pushed out.

[0007] Furthermore, the key fob recognition circuit board includes an RFID recognition circuit for wirelessly identifying key fobs, an electromagnet control circuit for controlling the switching of electromagnet poles, and a bus interface circuit for communicating with an expansion bus.

[0008] Furthermore, the unlocking and locking identification circuit board includes a photoelectric switch circuit that works with the detection board to identify the position of the sliding lock pin by reflecting the infrared signal of the photoelectric switch, and an interface circuit that reports the position of the sliding lock pin to the main control unit.

[0009] Furthermore, the housing of the expandable locking / unlocking mechanism is covered with an electromagnetic shielding layer to prevent electromagnetic signal interference when multiple expandable locking mechanisms are cascaded. The expandable locking / unlocking mechanism is mounted in the key compartment via a mounting bracket.

[0010] Preferably, the expansion bus includes an IDC plug and a cable, the IDC plug being mated to an IDC socket on an expandable unlocking mechanism.

[0011] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: (1) Multiple expandable locking and unlocking mechanisms are cascaded, and users can flexibly increase or decrease the number of expandable locking and unlocking mechanisms according to the actual number of keys managed, without replacing the entire device, effectively reducing the equipment expansion cost, and adapting to the key management needs of different scale power scenarios, solving the problem of poor expandability of traditional fixed-position devices; (2) RFID identification circuit is used to realize wireless and accurate identification of key buckles, avoiding wear and misjudgment of mechanical contact identification; (3) An electromagnetic shielding layer is covered on the outside, which can effectively shield the electromagnetic signal interference generated when multiple mechanisms are cascaded, ensuring the stable operation of core components, avoiding abnormal locking pin action or identification failure due to interference, and improving the reliability of the device in the complex electromagnetic environment of the power system. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention.

[0013] Figure 2 This is a schematic diagram of the expandable locking / unlocking mechanism in this invention;

[0014] Figure 3 This is a half-sectional view of the expandable locking / unlocking mechanism in this invention;

[0015] Figure 4 This is a diagram showing the locking state of the expandable locking / unlocking mechanism in this invention.

[0016] Figure 5 This is a diagram showing the unlocking state of the expandable locking / unlocking mechanism in this invention.

[0017] Figure 6 This is a schematic diagram of multiple cascaded expandable locking and unlocking mechanisms in this invention. Detailed Implementation

[0018] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0019] like Figure 1-6 As shown, this embodiment provides a key management device for an expandable interlocking mechanism applied to a power system, including a cabinet 1, a key compartment 2, an expandable interlocking mechanism 3, an expansion bus 4, an electromagnetic shielding layer 5, and a mounting bracket 6. The specific structure and working process are as follows.

[0020] The cabinet body 1 is made of cold-rolled steel plate, which is waterproof and dustproof. The key compartment 2 is located in the middle, and the cabinet has a door on the outside. The door can be equipped with an electronic lock or a mechanical lock to further enhance the security of the device. The key compartment 2 uses a mounting bracket 6 to install multiple expandable locking and unlocking mechanisms 3. The mounting bracket 6 has corresponding holes through which the key rings 31 of the expandable locking and unlocking mechanisms 3 can be exposed.

[0021] Each expandable locking / unlocking mechanism manages one key fob. The outer shell of the expandable locking / unlocking mechanism is covered with an electromagnetic shielding layer 5. The inner electromagnetic shielding layer 52 is made of ABS engineering plastic and is used to fix the key fob identification circuit board and the outer electromagnetic shielding layer. The outer electromagnetic shielding layer 51 is a metal layer with a thickness of 0.2-0.5mm to shield electromagnetic interference. The preferred material for the outer electromagnetic shielding layer 51 is aluminum.

[0022] The expandable locking / unlocking mechanism integrates a key fob identification circuit 32, a locking / unlocking identification circuit board 33, a lock pin control mechanism, and a main control unit. The main control unit uses an MCU controller. The key fob identification circuit 32 includes an RFID identification circuit, an electromagnet control circuit, and a bus interface circuit. The RFID identification circuit uses a 13.56MHz high-frequency RFID module to achieve wireless identification of the key fob's RFID tag. The electromagnet control circuit uses a main control unit-controlled switching transistor module, which employs an H-bridge drive circuit with four switching transistors. The MCU controller controls the switching transistors' on / off combinations, changing the current direction of the electromagnet coil and thus controlling the electromagnet's poles, enabling the sliding lock pin 35 to be pulled in and pushed out. The bus interface circuit uses the RS485 communication protocol and connects to the expansion bus 4 to communicate with the main control unit and other mechanisms. When the key fob 31 (with a built-in RFID tag) is inserted into the mechanism, the RFID identification circuit reads the tag information and uploads it to the main control unit, completing key identification verification.

[0023] The locking pin 34 is a cylindrical metal part located on the side wall of the key ring 31 insertion channel. It pops out under the action of a spring and embeds itself into the groove of the key ring 31 to achieve initial locking. The sliding lock pin 35 is a rectangular metal rod, one end of which is connected to the armature of the electromagnet 37, and the other end can be inserted into the key ring 31 lock hole. The detection plate 36 moves synchronously with the sliding lock pin 35 and is located above the unlocking and locking identification circuit board 33. The electromagnet control circuit controls the magnetic poles of the electromagnet 37 to achieve the attraction and release of the sliding lock pin. When the sliding lock pin 35 and the detection plate 36 move downwards and are attracted, the sliding lock pin exits the key ring lock hole to achieve unlocking. When the sliding lock pin 35 and the detection plate 36 return to their natural state, they spring upwards and the sliding lock pin inserts into the key ring lock hole to achieve locking. The lock / unlock identification circuit board 33 includes two photoelectric switch circuits (corresponding to the "locked position" and "unlocked position" of the sliding lock pin, respectively) and an interface circuit. The photoelectric switch circuit emits an infrared signal. When the detection board 36 moves to the corresponding position, the infrared signal is reflected. The photoelectric switch receives the reflected signal and converts it into an electrical signal, which is then uploaded to the main control unit through the interface circuit. The main control unit determines whether the key is currently in a locked or unlocked state based on the electrical signal.

[0024] The expansion bus uses an IDC cable 42, which is connected to the IDC socket 38 located behind the expandable unlocking mechanism 3 via an IDC plug 41. The number of IDC plugs matches the number of IDC sockets, enabling the cascading of multiple expandable unlocking mechanisms 3, while simultaneously completing power supply and data communication.

[0025] The key storage process is as follows: the key fob 31 with an RFID tag is inserted into the slot of the expandable locking / unlocking mechanism 3. The RFID identification circuit reads the key information and reports it to the main control unit. After the main control unit confirms that the key is correct, it controls the electromagnet 37 to be energized, which drives the sliding lock pin 35 to be inserted into the lock hole of the key fob 31. At the same time, the locking pin 34 is embedded into the groove of the key fob. The detection plate 36 moves to the "locked position" with the sliding lock pin. The photoelectric switch circuit sends a locking status signal to the main control unit to complete the locking.

[0026] The key retrieval process is as follows: The user initiates a key retrieval request through the main control unit (which can be connected to an external operating screen or remote control terminal). After verifying the user's authorization, the main control unit sends an unlocking command to the corresponding expandable locking / unlocking mechanism 3. The electromagnet control circuit controls the switching of the magnetic poles of the electromagnet 37, and the armature drives the sliding lock pin 35 to exit the key ring lock hole. The detection board 36 moves to the "unlock position", and the photoelectric switch circuit sends an unlocking status signal to the main control unit. The user can then pull out the key ring 31 to complete the unlocking.

[0027] When it is necessary to increase the number of keys managed, disconnect the power supply of the expansion bus 4, fix the newly added expandable locking / unlocking mechanism 3 in the free installation area of ​​the key compartment 2 through the mounting bracket 6, and use the IDC plug 41 to connect the IDC socket 38 of the new mechanism to the original expansion bus 4. After powering on, the main control unit automatically recognizes the new mechanism and completes the expansion.

Claims

1. A key management device for an extendable lock mechanism applied to a power system, comprising a cabinet (1) and a key locker (2) disposed in the cabinet (1) and used for storing keys, characterized in that, The key locker (2) is provided with a plurality of expandable unlocking and locking mechanisms (3), each of which comprises a key ring identification circuit board (32) capable of wirelessly identifying a key ring (31), an unlocking and locking identification circuit board (33) for determining whether the key ring is in an unlocking or locking state, a lock pin control mechanism for realizing unlocking and locking of the key ring, and a master control unit, and the plurality of expandable unlocking and locking mechanisms are cascaded through an expansion bus (4).

2. The key management device according to claim 1, characterized by The lock pin control mechanism comprises a locking pin (34) for locking the key ring (31), a sliding lock pin (35) for controlling the unlocking and locking state of the key ring, a detection plate (36) connected to the sliding lock pin and arranged above the unlocking and locking identification circuit board (33), and an electromagnet (37) for controlling the sliding lock pin (35) and the detection plate (36) to be sucked in or pushed out.

3. The key management device according to claim 1, characterized by The key ring identification circuit board (32) comprises an RFID identification circuit for wirelessly identifying the key ring (31), an electromagnet control circuit for controlling the switching of the magnetic poles of the electromagnet (37), and a bus interface circuit for communication with the expansion bus (4).

4. The key management device according to claim 1, characterized by The unlocking and locking identification circuit board (33) comprises a photoelectric switch circuit for identifying the position of the sliding lock pin (35) through reflection of infrared signals of the photoelectric switch in cooperation with the detection plate (36), and an interface circuit for reporting the position of the sliding lock pin (35) to the master control unit.

5. The key management device according to claim 1, characterized by The shell of the expandable unlocking and locking mechanism (3) is covered with an electromagnetic shielding layer (5) for shielding electromagnetic signals from interfering with each other when the plurality of expandable unlocking and locking mechanisms are cascaded.

6. The key management device according to claim 5, characterized by The electromagnetic shielding layer (5) is divided into an electromagnetic shielding outer layer (51) made of metal for shielding electromagnetic interference and an electromagnetic shielding inner layer (52) made of non-metal for fixing the electromagnetic shielding outer layer.

7. The key management device according to claim 1, characterized by The expandable unlocking and locking mechanism (3) is installed in the key locker (2) through a mounting bracket (6).

8. The key management device according to claim 1, characterized by The expansion bus (4) comprises an IDC plug (41) and an IDC cable (42), and the IDC plug (41) is plugged into an IDC socket (38) on the expandable unlocking and locking mechanism (3).

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