An explosion-proof independent self-test unit for an explosion-proof status indicator light group

Abstract

This invention discloses an explosion-proof independent self-test unit for an explosion-proof status indicator light group, relating to the field of industrial explosion-proof equipment technology. It includes a main control module for executing preset self-test control logic, a remote control signal interface, a local manual signal interface, a power isolation module for isolating and stepping down external industrial power to supply power to the local control circuit, a signal isolation module for achieving electrical isolation between the remote control signal and the main control module, and an output drive module for driving the explosion-proof light group according to the control signal output by the main control module. The main control module identifies the source of the input signal; when it identifies a local manual signal, it executes the preset self-test control logic and blocks or marks the status feedback to the main control system, thereby achieving no interference between inspection and system operation. This achieves independent self-testing of the explosion-proof light group and electrical isolation of the control system, avoiding accidental triggering of system interlocks or alarms during inspections, and improving the safety and stability of the explosion-proof light group in hazardous chemical plant applications.

Description

Technical Field

[0001] This invention relates to the field of industrial explosion-proof equipment technology, and in particular to an explosion-proof independent self-test unit for an explosion-proof status indicator light group. Background Technology

[0002] In hazardous chemical plants, refining units, oil and gas storage and transportation areas, and other locations with explosive gases or combustible dust, explosion-proof status indicator lights are typically installed on various types of equipment to enable visual monitoring of equipment operation status and remote safety interlocking. Existing explosion-proof status indicator lights generally consist of an explosion-proof housing, a sealed light-transmitting cover, LED light-emitting components, signal terminals, and an explosion-proof wiring cavity. Connected to control signals from a host computer or DCS system, they use different colored indicator lights (such as red, yellow, blue, and green) to display the equipment's operating, alarm, fault, and standby status, thereby achieving status indication and remote monitoring linkage.

[0003] However, current methods for detecting explosion-proof lighting assemblies generally rely on periodic testing by a central control system or manual recording. When inspectors need to check whether the lights are functioning correctly, they must determine the lights' status by triggering system commands or disconnecting and reconnecting the power. This method has two shortcomings: First, the detection activity may be misinterpreted by the central control system as a change in equipment status, potentially triggering false alarms or interlock shutdowns, affecting continuous production line operation. Second, in some areas, signal testing cannot be directly triggered when the system is interlocked, making it impossible for inspectors to quickly confirm the functionality of each indicator light on-site, increasing safety hazards. Especially in high-safety-level locations such as hazardous chemical plants, the failure or misinterpretation of status indicator lights can create monitoring blind spots, seriously affecting process safety management.

[0004] Furthermore, while existing explosion-proof light assemblies possess advanced explosion-proof structural designs (such as flameproof type d or composite type e structures), they generally lack an "independent detection" function module. Existing technologies attempt to connect a test power supply or parallel auxiliary switch to the outside of the light assembly, but because the signal path is still shared with the main control system, true detection independence cannot be achieved. Once the inspection test signals interfere with the production system signals, it can easily lead to control logic mis-triggers, production line interruptions, or accidental shutdowns, limiting the flexibility and safety of inspection work.

[0005] In summary, the existing technology has at least the following technical problems:

[0006] The existing explosion-proof light group inspection and testing requires triggering through the central control system, lacking independent testing functions, and there are technical problems such as the light group not being electrically isolated from the production line operation control when in the testing state. Summary of the Invention

[0007] The purpose of this invention is to provide an explosion-proof independent self-test unit for explosion-proof status indicator lights, so as to solve the technical problems of existing explosion-proof light group inspection and testing requiring triggering through the central control system, lacking independent detection function, and the lack of electrical isolation between the light group and the production line operation control when in the detection state.

[0008] The preferred technical solutions among the many technical solutions provided by this invention can produce a variety of technical effects, which are described in detail below.

[0009] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0010] This invention provides an explosion-proof independent self-test unit for an explosion-proof status indicator light group, including a main control module for executing the control logic of the light group; a remote control signal interface for receiving remote control signals from a central control system; a local manual signal interface for receiving locally manually triggered self-test signals; a power isolation module, whose input end is connected to an external industrial power supply and whose output end provides a local working power supply electrically isolated from the external industrial power supply to power the main control module, the remote control signal interface, and the local manual signal interface; a signal isolation module, disposed on the signal path between the remote control signal interface and the main control module, for achieving electrical isolation between the remote control signal and the main control module; and an output drive module, connected to the main control module, for driving the explosion-proof light group according to the control signals output by the main control module; wherein, the main control module is configured to identify whether the source of the input control signal is the remote control signal interface or the local manual signal interface; when the signal is identified as originating from the local manual signal interface, it executes preset self-test control logic and blocks or marks the status feedback communication to the central control system.

[0011] In one embodiment, the self-test control logic executed by the main control module includes: cyclically illuminating all or part of the lights in the explosion-proof light group according to a preset sequence and timing to perform functional verification; and the output signal of this process is not fed back to the main control system through the signal isolation module, thereby achieving electrical isolation and non-interference between the self-test control signal input by the local manual signal interface of the inspection input and the operation control of the main control system.

[0012] In one embodiment, the local manual signal interface includes a physical button and / or a dry contact terminal block.

[0013] In one embodiment, a watchdog module is also included. The watchdog module is connected to the main control module and is used to monitor the operating status of the main control module during the execution of the self-test control logic, and to perform a reset operation when the main control module crashes.

[0014] In one embodiment, the signal isolation module is an optocoupler or a magnetic coupler.

[0015] In one embodiment, the power isolation module includes: a first-stage isolation power supply unit for converting an externally input 24V DC voltage into an isolated 12V DC voltage; and a second-stage power conversion unit for converting the isolated 12V DC voltage into a 3.3V DC voltage to power the main control module.

[0016] In one embodiment, the output driving module includes: at least one switching transistor, the control terminal of which is connected to the output pin of the main control module; and at least one relay, the coil of which is driven by the switching transistor, and the relay contacts used to control the on / off state of each light load of the explosion-proof lamp group.

[0017] In one embodiment, the blocking or marking of status feedback communication to the central control system specifically means: when in self-test mode, the main control module suspends sending the status data of the explosion-proof light group to the central control system through the communication interface; or, the main control module adds a specific flag bit to the data packet sent to the central control system to indicate that the status data of the explosion-proof light group was generated by local testing.

[0018] In one embodiment, the remote control signal interface and the local manual signal interface are physically independent and different input channels, and are respectively connected to the independent I / O ports of the main control module.

[0019] An explosion-proof status indicator light group is also provided, which includes the aforementioned explosion-proof independent self-test unit.

[0020] The beneficial effects of this invention are as follows:

[0021] (1) Achieve electrical isolation and logical independence between the inspection and the main control system; By introducing a power isolation module and a signal isolation module into the circuit, the present invention enables the main control module to be completely electrically isolated from the main control system signal during the inspection self-test, avoiding the false alarm or false shutdown problem caused by the inspection test in the existing explosion-proof light group being triggered by the main control system, and fundamentally solving the technical contradiction of mutual interference between inspection and production line operation control.

[0022] (2) It has an independent self-test function, which improves the efficiency and safety of inspection. The present invention has a local manual signal interface and a corresponding self-test trigger logic. Inspection personnel can perform self-test of the explosion-proof light group by a single button without entering the system programming or changing the main control logic. The main control module automatically identifies the signal source and executes the self-test control process, so that the red, yellow, blue and green lights of the explosion-proof light group are lit in sequence to confirm the function, thereby achieving efficient and safe inspection and testing.

[0023] (3) Prevent system misrecording or interlock malfunction to ensure production continuity; when the main control module detects a signal from the local manual signal interface, it will block or mark the status feedback communication to the main control system to avoid the main control system misjudging the equipment status as abnormal or triggering an alarm, prevent production shutdown due to inspection, and significantly improve the production stability of hazardous chemical plants and explosion-proof environments.

[0024] (4) Balancing electrical safety and explosion-proof reliability; the power isolation module provides a local working power supply that is electrically isolated from the external industrial power supply, and together with the optocoupler or isolation drive circuit, it forms a double-layer explosion-proof isolation protection system to meet the explosion-proof requirements of Exd or Exe level, ensuring that the explosion-proof lamp group and the explosion-proof independent self-test unit can operate stably for a long time in a high-risk flammable environment.

[0025] (5) The system structure is modular and highly scalable; each functional module of the present invention, including the power isolation module, signal isolation module, main control module and output drive module, adopts independent packaging and standard interface design, which can be flexibly adapted to different models of explosion-proof lamp groups or main control and sub-control signal systems, and facilitates industrial field expansion and maintenance.

[0026] In summary, by introducing main control identification logic and dual isolation architecture into the explosion-proof light assembly, this invention effectively achieves the mutual non-interference between the inspection and self-testing functions of the explosion-proof independent self-testing unit and the operation control of the main control system, thereby improving the safety, reliability, and ease of use of the explosion-proof light assembly. Attached Figure Description

[0027] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the circuit structure of the remote control signal interface, output drive module, and power isolation module of the present invention;

[0029] Figure 2 This is a schematic diagram of the circuit structure of the main control module, local manual signal interface, signal isolation module and watchdog module of the present invention.

[0030] The accompanying figure is labeled as follows:

[0031] 1. Main control module; 11. Remote control signal interface; 12. Program download and debugging port;

[0032] 2. Local manual signal interface; 21. Physical button; 22. Dry contact terminal block;

[0033] 3. Power isolation module; 31. First-stage isolated power supply unit; 32. Second-stage power conversion unit;

[0034] 4. Signal isolation module;

[0035] 5. Output driver module; 51. Switching transistor; 52. Relay;

[0036] 6. Watchdog module. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0038] The specific implementation provides an explosion-proof independent self-test unit for an explosion-proof status indicator light group, including a main control module for executing preset self-test control logic, a remote control signal interface for receiving remote control signals from the main control system, a local manual signal interface for receiving locally manually triggered self-test signals, a power isolation module for isolating and stepping down external industrial power to supply power to the local control circuit, a signal isolation module for achieving electrical isolation between the remote control signal and the main control module, and an output drive module for driving the explosion-proof light group according to the control signal output by the main control module. The main control module identifies the source of the input signal. When it identifies a local manual signal, it executes the preset self-test control logic and blocks or marks the status feedback to the main control system, thereby achieving that the inspection and system operation do not interfere with each other. It realizes the independent self-test of the explosion-proof light group and the electrical isolation of the control system, avoiding accidental triggering of system interlocks or alarms during inspection, and improving the safety and stability of the explosion-proof light group in the application of hazardous chemical plants. It effectively solves the technical problems of existing explosion-proof light group inspection and testing requiring triggering through the main control system, lacking independent detection function, and not achieving electrical isolation between the light group in the detection state and the production line operation control.

[0039] The first implementation of the explosion-proof independent self-test unit is as follows: Figure 1 and Figure 2As shown, the system includes a main control module 1 for executing the control logic of the lamp group; a remote control signal interface 11 for receiving remote control signals from the main control system; a local manual signal interface 2 for receiving self-test signals triggered manually; a power isolation module 3, whose input is connected to an external industrial power supply and whose output provides a local working power supply electrically isolated from the external industrial power supply to power the main control module 1, the remote control signal interface 11, and the local manual signal interface 2; a signal isolation module 4, located on the signal path between the remote control signal interface 11 and the main control module 1, for achieving electrical isolation between the remote control signal and the main control module 1; and an output drive module 5, connected to the main control module 1, for driving the explosion-proof lamp group according to the control signals output by the main control module 1. The main control module 1 is configured to identify whether the source of the input control signal is the remote control signal interface 11 or the local manual signal interface 2. When the signal is identified as originating from the local manual signal interface 2, it executes the preset self-test control logic and blocks or marks the status feedback communication to the main control system.

[0040] in, Figure 1 and Figure 2 The circuit structure diagram shows the corresponding connections of each terminal within the unit, forming a complete explosion-proof independent self-testing unit.

[0041] Specifically, addressing the technical problems of existing explosion-proof light group inspection and testing requiring triggering through the central control system, lacking independent detection functions, and failing to achieve electrical isolation between the light group in the detection state and the production line operation control, this invention proposes an explosion-proof independent self-test unit for production explosion-proof status indicator light groups in industrial equipment. This unit offers several technical advantages: achieving electrical isolation and logical independence between inspection and the central control system; and by introducing a power isolation module 3 and a signal isolation module 4 into the circuit, this invention ensures complete electrical isolation between the main control module 1 and the central control system signal during inspection and self-testing, avoiding false alarms or accidental shutdowns caused by the need for central control system triggering in existing explosion-proof light group inspection and testing, fundamentally resolving the technical contradiction of mutual interference between inspection and production line operation control.

[0042] Equipped with independent self-testing function, this invention improves inspection efficiency and safety. It features a local manual signal interface 2 and corresponding self-testing trigger logic. Inspection personnel can perform self-testing of the explosion-proof light group with a single button without entering the system programming or modifying the main control logic. The main control module 1 automatically identifies the signal source and executes the self-testing control process, causing the red, yellow, blue, and green lights of the explosion-proof light group to light up sequentially for functional confirmation, thereby achieving efficient and safe inspection testing.

[0043] To prevent system misrecording or interlock malfunctions and ensure production continuity, when the main control module 1 detects a signal from the local manual signal interface 2, it will block or mark the status feedback communication to the central control system, preventing the central control system from misjudging the equipment status as abnormal or triggering an alarm, preventing production shutdowns due to inspections, and significantly improving production stability in hazardous chemical plants and explosion-proof environments.

[0044] Balancing electrical safety and explosion-proof reliability; the power isolation module 3 provides a local working power supply that is electrically isolated from the external industrial power supply, and together with the optocoupler or isolation drive circuit, it forms a double-layer explosion-proof isolation protection system, meeting the explosion-proof requirements of Exd or Exe level, and ensuring the long-term stable operation of the explosion-proof lamp group and the explosion-proof independent self-test unit in high-risk flammable environments.

[0045] The system has a modular structure and strong scalability. The functional modules of this invention include a power isolation module 3, a signal isolation module 4, a main control module 1, and an output drive module 5. All of them adopt independent packaging and standard interface design, which can flexibly adapt to different models of explosion-proof lamp groups or main control and sub-control signal systems, and facilitate industrial field expansion and maintenance.

[0046] In summary, by introducing main control identification logic and dual isolation architecture into the explosion-proof light assembly, this invention effectively achieves the mutual non-interference between the inspection and self-testing functions of the explosion-proof independent self-testing unit and the operation control of the main control system, thereby improving the safety, reliability and ease of use of the explosion-proof light assembly.

[0047] As one alternative implementation method:

[0048] The specific settings for the self-test control logic of the main control module 1 are as follows: The self-test control logic executed by the main control module 1 includes: cyclically lighting all or part of the lights of the explosion-proof light group in a preset order and timing sequence to perform functional verification; and the output signal of this process is not fed back to the main control system through the signal isolation module 4, thereby realizing the electrical isolation and non-interference between the self-test control signal input by the local manual signal interface 2 of the inspection input and the operation control of the main control system.

[0049] Specifically, in the self-test mode of the self-test control logic, the main control module 1 independently outputs control signals to cause the red, yellow, blue, and green lights in the explosion-proof light group to light up sequentially, flash sequentially, light up synchronously, flash synchronously, or flash and light up in a specified order, or to cause the red, yellow, blue, and green lights in the explosion-proof light group to light up cyclically, flash cyclically, light up synchronously, flash synchronously, or flash and light up cyclically in a specified order.

[0050] When applied, the main control module 1 executes the self-test control mode through program logic. After receiving the trigger signal from the local manual signal interface 2, it automatically starts the preset self-test process and sequentially tests the lighting or flashing of each color indicator light of the explosion-proof light group. This self-test control logic is independent of the remote control signal channel, and its output signal does not return to the main control system through the signal isolation module 4, thereby achieving electrical isolation between the self-test input and the main control operation control.

[0051] This signal isolation control method allows inspection personnel to quickly confirm the brightness, response time, and drive integrity of each explosion-proof light group without interfering with the main control system. This ensures the reliability of the light signal display and avoids triggering alarms or shutdown commands in the main control system due to misidentification of the self-test signals of the explosion-proof light groups during inspection.

[0052] In addition, the self-test control logic can set the lighting mode of the lamp group according to different application scenarios, such as sequential flashing, synchronous flashing, cyclic flashing, lighting according to priority order, etc.; at the same time, different delay intervals or flash frequencies can be set to adapt to the visual recognition characteristics in dangerous environments; and the program of the main control module 1 can be added or removed through the built-in program download and debugging port 12.

[0053] Regarding the control input structure of the aforementioned local manual signal interface 2, the local manual signal interface 2 includes a physical button 21 and / or a dry contact terminal block 22.

[0054] When applied, the local manual signal interface 2 inputs inspection signals via physical button 21 or dry contact terminal. The input path of the inspection signal is independent of the main control signal channel, thereby achieving complete isolation between the on-site inspection operation and the control logic of the main control system. Operators can directly trigger the self-test process via button, and the main control module 1 automatically identifies the signal source and enters the self-test mode. This not only simplifies the inspection steps and reduces the interference of human operation on the system, but also ensures that the inspection signal has an independent and safe input channel, avoiding electrical interference and false triggering.

[0055] In addition, the local manual signal interface 2 can adopt a dual-channel redundant design, serving as "test start" and "reset confirmation" signals respectively, or be configured with explosion-proof button components to meet the safety requirements of explosion-proof environments of Exd IIC T6 level and above.

[0056] Regarding the specific type of the aforementioned signal isolation module 4, the signal isolation module 4 is an optocoupler isolator or a magnetic coupler isolator.

[0057] When applied, the signal isolation module 4 achieves electrical isolation through optocoupler or magnetic coupler controlled components, preventing the voltage, current or interference pulses of the main control signal from being directly transmitted to the logic layer of the main control module 1. This ensures that the local control circuit has an insulation barrier between the hazardous area and the safe area. This structure not only improves the system's anti-electromagnetic interference capability, but also prevents damage or false triggering of the main control chip caused by voltage surges on the main control side, effectively improving the system safety level of the entire explosion-proof lighting group.

[0058] In signal isolation module 4, an overvoltage suppressor or TVS diode can be further installed to absorb surge current, and the interface of the optocoupler signal can be expanded into a multi-channel synchronous isolation structure to adapt to multi-signal input scenarios.

[0059] Regarding the specific structure of the power isolation module 3 mentioned above, the power isolation module 3 includes: a first-stage isolation power supply unit 31, which converts the externally input 24V DC voltage into an isolated 12V DC voltage; and a second-stage power conversion unit 32, which converts the isolated 12V DC voltage into a 3.3V DC voltage to power the main control module 1.

[0060] When applied, the power isolation module 3 adopts a two-stage power conversion structure. The first-stage isolation power unit 31 converts the external 24V DC input into an isolated 12V voltage, and the second-stage power conversion unit 32 regulates the isolated 12V to 3.3V to provide a safe low-voltage power supply for the main control module 1 and the control system.

[0061] This structure ensures electrical isolation between the power supply side and the logic side, and prevents external power grid fluctuations or electromagnetic interference from directly affecting the control circuit, thereby improving the power supply stability and intrinsic safety performance of the explosion-proof lamp group.

[0062] The power isolation module 3 can be an isolation transformer with shielded windings or a DC / DC module, and an LC filter network and TVS voltage regulator are added at the output end to meet the requirements of high anti-interference level.

[0063] Regarding the specific control structure of the above-mentioned output drive module 5 and its combination structure with the explosion-proof lamp group, the output drive module 5 includes: at least one switching transistor 51, the control terminal of the switching transistor 51 is connected to the output pin of the main control module 1; and at least one relay 52, the coil of the relay 52 is driven by the switching transistor 51, and the contacts of the relay 52 are used to control the on / off of each light load of the explosion-proof lamp group.

[0064] In application, the switching transistor 51 in the output drive module 5 is controlled by the output pin of the main control module 1. Its output terminal drives the coil of the relay 52 to switch on and off, thereby realizing the control of each explosion-proof lamp load. The output drive module 5 amplifies the low voltage signal of the main control module 1 into a high-power electrical signal that can drive the explosion-proof lamp group through the cascade structure of the MOS transistor and the relay 52, ensuring the fast response and stable current of the lamp group control.

[0065] In self-test mode, the main control module 1 can change the timing and duty cycle of the output pulses to achieve group testing or cyclic lighting of the explosion-proof light group, making it convenient for inspection personnel to observe and determine the functional status of each street light.

[0066] The relay 52 can adopt a double contact structure to realize normally open / normally closed dual control functions; the output terminal of the explosion-proof lamp group can be equipped with a reverse connection protection diode or transient suppression circuit to prevent electromagnetic backlash from interfering with the main control circuit.

[0067] Regarding the aforementioned blocking or marking of the status feedback communication of the explosion-proof light group issued by the main control module 1, and blocking or marking the status feedback communication to the main control system, specifically: when in self-test mode, the main control module 1 suspends sending the status data of the explosion-proof light group to the main control system through the communication interface; or, the main control module 1 adds a specific flag bit to the data packet sent to the main control system to indicate that the status data of the explosion-proof light group was generated by local testing.

[0068] Specifically, the status data of the explosion-proof light group generated by local testing will not be included in the production operation record.

[0069] When the self-test mode is activated, the main control module 1 will pause sending status feedback signals of the explosion-proof lamp group to the central control system via the communication interface, or add a flag indicating "test status" to the communication message. This prevents the lamp group status data during the self-test from being recorded in the production operation record. This logic further avoids the self-test behavior being misjudged by the system as equipment failure or alarm signal, prevents accidental shutdowns caused by inspections, and ensures the continuity of the production line and the accuracy of system data.

[0070] The main control module 1 can use RS485, CAN or Modbus communication protocols and add a "TEST_MODE" flag bit to the data frame; the system can automatically clear the flag and restore normal communication status after the self-test is completed.

[0071] Regarding the connection path settings for the aforementioned remote control signal interface 11 and local manual signal interface 2, the remote control signal interface 11 and local manual signal interface 2 are physically independent and different input channels, and are respectively connected to the independent I / O ports of the main control module 1.

[0072] In application, the remote control signal interface 11 and the local manual signal interface 2 are respectively connected to different I / O ports of the main control module 1, and maintain independent paths at the physical wiring level, thereby avoiding signal crosstalk. The main control module 1 determines the signal input source through program logic, realizing independent identification and logical switching of the two types of signals; ensuring that no erroneous input or signal aliasing occurs in any mode, enhancing system stability and anti-interference capability.

[0073] The main control module 1 can be configured with a digital filtering algorithm at the input end to eliminate dry contact jitter signals, and can be further expanded with multi-channel input logic to achieve interlocking switching between remote, local and automatic control modes.

[0074] The second implementation of the explosion-proof independent self-test unit is as follows: Figure 2 As shown, the difference between this embodiment and the first embodiment is that it also includes a watchdog module 6. The watchdog module is connected to the main control module 1 and is used to monitor the running status of the main control module 1 during the execution of the self-test control logic of the main control module 1, and to perform a reset operation when the main control module 1 runs away.

[0075] When applied, the watchdog module 6 is connected to the main control module 1 and continuously monitors its operating status during the execution of the self-test control logic of the main control module 1. When the program crashes or becomes unresponsive, the watchdog module 6 outputs a reset signal to restart the main control module 1. This ensures that the explosion-proof independent self-test unit can maintain the correct execution of the self-test logic in explosion-proof environments with high electromagnetic interference, temperature fluctuations, or unstable power supply, and prevents abnormal states such as the relay 52 of the explosion-proof lamp group being engaged for a long time or the explosion-proof lamp group being constantly lit.

[0076] Watchdog module 6 can add a timing delay mechanism to the reset logic to avoid false resets; at the same time, it can work in conjunction with the software watchdog in the main control module 1 program to form a two-layer fault-tolerant control structure.

[0077] Based on the above embodiments of the explosion-proof independent self-test unit, an explosion-proof status indicator light group is provided, which includes the explosion-proof independent self-test unit.

[0078] In application, the explosion-proof status indicator light group of the present invention includes an explosion-proof independent self-test unit and an explosion-proof lamp body assembly connected thereto. The explosion-proof independent self-test unit is installed in the explosion-proof control cabinet, and its output end is connected to the explosion-proof lamp body assembly through a sealed explosion-proof terminal block, which is used to control the lighting and flashing status of the four colors of red, yellow, blue and green lights.

[0079] With this structure, when the main control system is in normal operation, the lamp group responds to the remote control signal to display the equipment's operating status; when the inspection personnel need to test the lamp group's performance, they can trigger the self-test logic through the local manual signal interface 2 of the explosion-proof independent self-test unit, so that the explosion-proof lamp group can perform local lighting tests without triggering feedback from the main control system, thereby achieving mutual non-interference between inspection and system operation.

[0080] The operation of this explosion-proof status indicator light group demonstrates the synergistic effect between the modules: the power isolation module 3 and the signal isolation module 4 form a double-layer electrical isolation barrier to ensure the inherent safety of control signals and power transmission; the main control module 1 identifies the source of the input signal through self-test control logic, realizing dynamic switching between remote control mode and local self-test mode; the output drive module 5 amplifies the control signal by cascading MOSFETs and relays 52 to drive the explosion-proof light group to achieve a fast and stable response; at the same time, in self-test mode, the main control module 1 pauses or marks the feedback data, so that the central control system will not misjudge the equipment status.

[0081] Through the aforementioned collaborative working mechanism, the explosion-proof status indicator light group of the present invention not only possesses high explosion-proof safety and anti-electromagnetic interference capabilities, but also effectively avoids the problem of the central control system erroneously shutting down or falsely alarming industrial equipment caused by inspections, significantly improving the operational stability and maintenance efficiency of equipment in explosion-proof scenarios such as hazardous chemical plants.

[0082] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described.

Claims

1. An explosion-proof independent self-test unit for an explosion-proof status indicator light group, characterized in that, Includes a main control module, which is used to execute the control logic of the lamp group; And a remote control signal interface for receiving remote control signals from the central control system; And a local manual signal interface, used to receive self-test signals triggered manually locally; And a power isolation module, whose input end is connected to an external industrial power supply and whose output end provides a local working power supply that is electrically isolated from the external industrial power supply, to power the main control module, the remote control signal interface and the local manual signal interface; And a signal isolation module, which is installed on the signal path between the remote control signal interface and the main control module, to achieve electrical isolation between the remote control signal and the main control module; And an output drive module, connected to the main control module, used to drive the explosion-proof lamp group according to the control signal output by the main control module; The main control module is configured to identify whether the source of the input control signal is the remote control signal interface or the local manual signal interface; when the signal is identified as originating from the local manual signal interface, it executes a preset self-test control logic and blocks or marks the status feedback communication to the main control system. The self-test control logic executed by the main control module includes: cyclically illuminating all or part of the lights in the explosion-proof light group according to a preset sequence and timing to perform functional verification; and the output signal of the self-test process is not fed back to the main control system through the signal isolation module, thereby achieving electrical isolation and non-interference between the self-test control signal input by the local manual signal interface of the inspection input and the operation control of the main control system. It also includes a watchdog module, which is connected to the main control module and is used to monitor the operating status of the main control module during the execution of the self-test control logic, and to perform a reset operation when the main control module experiences a program crash. The signal isolation module is an optocoupler or a magnetic coupler; Specifically, the blocking or marking of status feedback communication to the central control system involves: when in self-test mode, the main control module suspends sending status data of the explosion-proof light group to the central control system through the communication interface; or, the main control module adds a specific flag bit to the data packet sent to the central control system to indicate that the status data of the explosion-proof light group was generated by local testing. The remote control signal interface and the local manual signal interface are physically independent and different input channels, and are respectively connected to the independent I / O ports of the main control module.

2. The explosion-proof independent self-test unit according to claim 1, characterized in that, The local manual signal interface includes physical buttons and / or dry contact terminals.

3. The explosion-proof independent self-test unit according to claim 1, characterized in that, The power isolation module includes: a first-stage isolation power supply unit, used to convert an externally input 24V DC voltage into an isolated 12V DC voltage; And a second-stage power conversion unit, used to convert the isolated 12V DC voltage into a 3.3V DC voltage to power the main control module.

4. The explosion-proof independent self-test unit according to claim 1, characterized in that, The output driving module includes: at least one switching transistor, the control terminal of which is connected to the output pin of the main control module; And at least one relay, the coil of which is driven by the switching transistor, and the relay contacts are used to control the on / off state of each light load of the explosion-proof light group.

5. An explosion-proof status indicator light group, characterized in that, It includes an explosion-proof independent self-test unit as described in any one of claims 1 to 4.

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