CN212302567U - Key management machine - Google Patents

Abstract

The utility model discloses a key management machine, which comprises a main control board and N key detection boards, wherein the main control board is in communication connection with each key detection board through a CAN bus; each key detection board is provided with a resistance network and a dial switch S1 for adjusting the resistance value of the resistance network connected to the CAN bus. The beneficial effects of the utility model reside in that: the mode that the dial switch is used for configuring the matching resistors of the CAN bus terminal (each key detection board) of the key management machine CAN improve the communication stability of the CAN bus of the key management machine under the condition of not increasing the types and the cost of the board cards, and the actual effect is obvious.

Description

Key management machine

Technical Field

The utility model relates to a lock control technical field, the key management machine that needs carry out the management and control to special key in the concretely relates to some specific trade.

Background

In certain industries, such as in power generation enterprises (including substations, power plants, etc.), there are numerous types of complex and numerous numbers of keys. These keys cannot be picked up and used at will, otherwise incorrect operations occur, leading to significant production and safety hazards. For this reason, electric power production enterprises gradually introduce a key management machine, which is a device for effectively managing and controlling keys.

The key management machine generally comprises a cabinet body, a man-machine interaction interface panel, a power panel, a main control panel and the like. The cabinet body can be provided with a lock-controllable cabinet door, and a plurality of key lock control assemblies are arranged in the cabinet body; the man-machine interaction interface board is used for providing functions of key pressing, displaying and the like, and also can provide identity recognition functions of reading cards and the like (for example, the cabinet door can be opened after the identity is verified by reading the cards); the power panel is used for providing a working power supply for the management machine, and the main control panel is used for signal input, signal output, signal analysis processing and other operations, such as outputting a key state signal to the man-machine interaction interface panel for display, receiving information or instructions input by the man-machine interaction interface panel, performing communication interaction with an upper computer, generating a control signal for the key lock control assembly and the like.

In order to detect whether the corresponding key is in place, the key management machine is also provided with a key detection plate, and generally, one key detection plate is arranged at each row or each column of key storage positions. The key detection board is provided with a corresponding number of key lock control assemblies corresponding to the key storage positions and used for controlling locking (the key cannot be taken away) and unlocking (the key can be taken away) of corresponding keys. As shown in figure 1, the master control board communicates with each key detection board through a CAN bus to complete unlocking authorization and on-site state detection of the key. The key detection boards have the same function, and the main difference is that the positions on the CAN bus are different, and the required CAN bus terminals have different matching resistances.

In the practical application of the CAN bus, because signals are reflected in the transmission process, if the signals exceed the CAN communication standard, common mode interference is introduced lightly to cause communication failure, and devices are damaged seriously. In order to ensure the correct communication of the CAN bus, a matching resistor is required to be added to each terminal of the CAN communication network, the resistance value of the matching resistor of each terminal is related to the position of the terminal in the bus, and the terminals at different positions need to select different matching resistors to ensure the normal communication of the CAN network. Fig. 2 shows a connection manner of matching resistors of a typical CAN controller, where two matching resistors of 60 Ω are added between the first and last terminals CANH and CANL, and two matching resistors of 1.3K are added between the remaining terminals CANH and CANL.

However, the matching resistance of the CAN bus of the existing key management machine is a fixed value, so that it is inconvenient to adjust the matching resistance value in the field use process.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a key management machine CAN conveniently adjust the matching resistance of key pick-up plate on the CAN bus. The utility model discloses realize by following technical scheme:

a key management machine comprises a main control board and N key detection boards, wherein the main control board and each key detection board are respectively in communication connection with a CAN bus through a CAN module; the method is characterized in that: each key detection board is provided with a resistance network and a dial switch S1 for adjusting the resistance value of the resistance network connected to the CAN bus.

As a specific technical scheme, the resistor network and the dial switch S1 for adjusting the resistance value of the resistor network connected to the CAN bus are arranged on the corresponding key detection board.

Specifically, the CAN module adopts a TJA1040 chip, and a CANL terminal and a CANH terminal of the CAN module are connected to a CAN bus.

As a specific technical solution, the dip switch S1 is a four-channel dip switch, the 5 th pin of the dip switch S1 is connected with a resistor R3, the 6 th pin is connected with a resistor R5, the 7 th pin is connected with a resistor R4, the 8 th pin is connected with a resistor R6, the resistors R3 and R5 are connected, the node of the two is grounded through a capacitor C1, the resistors R4 and R6 are connected, and the node of the two is grounded through a capacitor C2; channels 1-8 and 3-6 of dip switch S1 are connected to CANL, channels 2-7 and channels 4-5 of the CAN bus are connected to CANH of the CAN bus.

As a specific technical solution, the dial switch S1 is configured as follows: when the key detection board is arranged at the 1 st to the N-1 st node positions, pins 4, 5, pins 3 and 6 of the dial switch S1 are switched on, pins 2, 7, pins 1 and 8 of the dial switch S1 are switched off, and R4 and R6 matched resistors are selected; when the key detecting board is arranged at the Nth node position, the pins 2 and 7 and the pins 1 and 8 of the dial switch S1 are switched on, the pins 4 and 5 and the pins 3 and 6 of the dial switch S1 are switched off, and the matching resistors R3 and R5 are selected.

As a specific technical scheme, each key detection board is also correspondingly provided with a protection circuit, the protection circuit is a TVS diode TVS1 connected between a CANL line and a CANH line of a CAN bus, and the protection circuit is also arranged on the corresponding key detection board.

As a specific technical scheme, each key detection board is provided with a detection main control chip and a key detection module electrically connected with the detection main control chip, and the CAN module is electrically connected with the detection main control chip.

According to the specific technical scheme, each key detection plate is provided with a key lock control assembly for unlocking and controlling the keys, and the key lock control assembly is electrically connected with the detection main control chip.

As a specific technical scheme, the key detection module adopts a photoelectric detection device or an RFID code reading device.

As a specific technical scheme, the upstream and downstream communication lines between the detection main control chip and the CAN module are respectively provided with an optical isolator U1, U3.

The beneficial effects of the utility model reside in that: the mode that the dial switch is used for configuring the matching resistors of the CAN bus terminal (each key detection board) of the key management machine CAN improve the communication stability of the CAN bus of the key management machine under the condition of not increasing the types and the cost of the board cards, and the actual effect is obvious.

Drawings

Fig. 1 is a schematic diagram of a master control board and a key detection board in a key management machine connected through a CAN bus.

Fig. 2 is a schematic diagram of a typical connection manner of the matching resistors of each terminal of the CAN bus.

Fig. 3 is the embodiment of the utility model provides a key management machine in master control board and each key detection board pass through the schematic diagram of CAN bus connection.

Fig. 4 is a circuit diagram of a signal processing section in a key detection board of a key management machine according to an embodiment of the present invention.

Detailed Description

The key management machine provided by the embodiment comprises a cabinet body, a man-machine interaction interface panel, a power panel, a main control panel and a key detection panel. The cabinet body can be provided with a lock-controllable cabinet door, and a plurality of key lock control assemblies are arranged in the cabinet body; the plurality of key lock control assemblies are respectively used for controlling locking (the key cannot be taken away) and unlocking (the key can be taken away) of the corresponding key; the man-machine interaction interface board is used for providing functions of key pressing, displaying and the like, and also can provide identity recognition functions of reading cards and the like (for example, the cabinet door can be opened after the identity is verified by reading the cards); the power panel is used for providing a working power supply for the management machine, and the main control panel is used for inputting, outputting, analyzing and processing signals and other operations, such as outputting key state signals to the man-machine interaction interface panel for displaying, receiving information or instructions input by the man-machine interaction interface panel, performing communication interaction with an upper computer, generating control signals for the key lock control assembly and the like. The cabinet body, the human-computer interaction interface panel, the power panel, the main control panel and the key lock control assembly can be realized through the prior art, and the specific implementation scheme is not repeated in the application.

Suppose that the key management machine in the present application is configured with N key detection boards for detecting N rows of key storage locations, each row being assumed to correspond to four key storage locations. As shown in figure 1, the master control board communicates with each key detection board through a CAN bus to complete unlocking authorization and on-site state detection of the key.

As shown in fig. 3, each key detection board is connected to the CAN bus in a communication manner through a CAN module, and is further provided with a resistor network and a dial switch S1 for adjusting the resistance value of the resistor network connected to the CAN bus. In this embodiment, the CAN module uses a TJA1040 chip, and a CANL terminal and a CANH terminal of the CAN module are connected to a CAN bus; the dial switch S1 is a four-channel dial switch, and the resistance network is composed of matching resistors respectively connected in series on four channels of the dial switch S1. Specifically, a resistor R3 is connected to the 5 th pin of the four channel dial switch S1, a resistor R5 is connected to the 6 th pin, a resistor R4 is connected to the 7 th pin, a resistor R6 is connected to the 8 th pin, resistors R3 and R5 are connected, the node of the two resistors is grounded through a capacitor C1, and resistors R4 and R6 are connected, and the node of the two resistors is grounded through a capacitor C2. Channels 1-8 and 3-6 are connected to CANL of the CAN bus, and channels 2-7 and 4-5 are connected to CANH of the CAN bus. The resistor network and the dial switch S1 for adjusting the resistance value of the resistor network are arranged on the corresponding key detection board. In addition, each key detection board is also correspondingly provided with a protection circuit, the protection circuit is a TVS diode TVS1 connected between a CANL line and a CANH line of the CAN bus, and the protection circuit is also arranged on the corresponding key detection board and used for electrostatic protection.

As shown in fig. 4, each key detection board is provided with a detection main control chip and a key detection module electrically connected to the detection main control chip, and the above-mentioned CAN module is electrically connected to the detection main control chip. The key detection board is provided with a corresponding number of key lock control assemblies (not shown in the figure and belonging to the prior art) corresponding to the key storage positions, and the key lock control assemblies are used for controlling locking (the key cannot be taken away) and unlocking (the key can be taken away) of corresponding keys.

The key detection modules on each key detection plate are assumed to be four (corresponding to four key storage positions), photoelectric detection devices or RFID code reading devices can be adopted, and whether keys exist on the corresponding key storage positions or not is detected in real time or after a detection instruction is responded, and even whether the correct keys are placed on the correct key storage positions or not can be judged by reading the identity information of the keys. The detection main control chip is used for responding to the detection instruction and acquiring the acquisition signal of the key detection module, and the CAN module is used for realizing the communication between the detection main control chip and the CAN bus. In this embodiment, the upstream and downstream communication lines between the detection main control chip and the CAN module are respectively provided with an optical isolator U1, U3.

In actual use, the specific configuration mode is as follows: the dial switch S1 has two matching modes, the first mode is that when a key detection board is arranged at the middle node positions of 1, 2, 3, 4 and 5 in the picture 1, pins 4 and 5 and pins 3 and 6 of the dial switch S1 are switched on, pins 2 and 7 and pins 1 and 8 of the dial switch S1 are switched off, and R4 and R6 matching resistors are selected; when the key detecting board is arranged at the N termination node position of the FIG. 1, the pins 2, 7 and 1, 8 of the dial switch S1 are switched on, the pins 4, 5 and 3, 6 of the dial switch S1 are switched off, and the matching resistors R3 and R5 are selected.

The above embodiments are merely for full disclosure and are not intended to limit the present invention, and all changes that can be made without creative work based on the inventive idea and the equivalent technical features should be considered as the scope of the present disclosure.

Claims (10)

1. A key management machine comprises a main control board and N key detection boards, wherein the main control board and each key detection board are respectively in communication connection with a CAN bus through a CAN module; the method is characterized in that: each key detection board is provided with a resistance network and a dial switch S1 for adjusting the resistance value of the resistance network connected to the CAN bus.

2. The key management machine of claim 1, wherein the resistor network and a dial switch S1 for adjusting the resistance of the resistor network connected to the CAN bus are provided on the corresponding key detection board.

3. The key management machine of claim 1, wherein the CAN module employs a TJA1040 chip, and CANL and CANH terminals of the CAN module are connected to a CAN bus.

4. The key management machine of any one of claims 1 to 3, wherein the dial switch S1 is a four-channel dial switch, the 5 th pin of the dial switch S1 is connected with a resistor R3, the 6 th pin is connected with a resistor R5, the 7 th pin is connected with a resistor R4, the 8 th pin is connected with a resistor R6, resistors R3 and R5 are connected, the node of the two resistors is grounded through a capacitor C1, and the nodes of the two resistors R4 and R6 are connected and grounded through a capacitor C2; channels 1-8 and 3-6 of dip switch S1 are connected to CANL, channels 2-7 and channels 4-5 of the CAN bus are connected to CANH of the CAN bus.

5. The key management machine of claim 4, wherein the dip switch S1 is configured in such a way that: when the key detection board is arranged at the 1 st to the N-1 st node positions, pins 4, 5, pins 3 and 6 of the dial switch S1 are switched on, pins 2, 7, pins 1 and 8 of the dial switch S1 are switched off, and R4 and R6 matched resistors are selected; when the key detecting board is arranged at the Nth node position, the pins 2 and 7 and the pins 1 and 8 of the dial switch S1 are switched on, the pins 4 and 5 and the pins 3 and 6 of the dial switch S1 are switched off, and the matching resistors R3 and R5 are selected.

6. The key management machine according to any one of claims 1 to 3, wherein each of the key detection plates is further provided with a protection circuit, the protection circuit is a TVS diode TVS1 connected between a CANL line and a CANH line of the CAN bus, and the protection circuit is also provided on the corresponding key detection plate.

7. The key management machine of any one of claims 1 to 3, wherein each key detection board is provided with a detection main control chip and a key detection module electrically connected with the detection main control chip, and the CAN module is electrically connected with the detection main control chip.

8. The key management machine according to claim 7, wherein each of the key detection plates is provided with a key lock assembly for controlling unlocking of the key, and the key lock assembly is electrically connected with the detection main control chip.

9. The key management machine of claim 7, wherein the key detection module employs a photoelectric detection device or an RFID code reading device.

10. The key management machine of claim 9, wherein upstream and downstream communication lines between the sensing master chip and the CAN module are provided with optical isolation devices U1, U3, respectively.

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