Intelligent ignition control cabinet safety interlock protection device

Abstract

The utility model discloses an intelligent ignition control cabinet safety interlocking protection device relates to ignition control safety technical field, including the explosion -proof cabinet body and signal acquisition subassembly, the inside of explosion -proof cabinet body is provided with interlock control unit, and interlock control unit includes PLC controller, safety relay and standby power module, the PLC controller electricity is connected with safety relay and standby power module, signal acquisition subassembly installs in the outside of explosion -proof cabinet body. This intelligent ignition control cabinet safety interlocking protection device, with PLC controller as the core, linkage safety relay and executing mechanism, constructs " monitoring - judge - execution " system interlocking logic, avoids traditional no unified central protection disorder problem, and electromagnetic gas cut -off valve responds quickly, and the sound -light alarm gives timely early warning, and the standby power module guarantees power -off protection not to interrupt, all -round improvement ignition system security and reliability, adapts to industrial combustion scene efficient operation demand.

Description

Technical Field

[0001] This utility model relates to the field of ignition control safety technology, specifically to a safety interlock protection device for an intelligent ignition control cabinet. Background Technology

[0002] Intelligent ignition control cabinets are widely used in industrial combustion systems (such as boilers, kilns, and gas equipment). Their ignition operation is directly related to the safety of system operation. If ignition is triggered under unsafe conditions such as gas leakage, abnormal pressure, or damper not being in place, it can easily cause accidents such as explosions and fires, threatening the safety of equipment and personnel. Therefore, protection is required.

[0003] Traditional ignition control cabinets often rely on a single pressure or temperature sensor to trigger protection, lacking systematic interlocking logic and exhibiting significant safety vulnerabilities.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and proposed a safety interlock protection device for intelligent ignition control cabinet. Utility Model Content

[0005] The purpose of this invention is to provide a safety interlock protection device for an intelligent ignition control cabinet to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a safety interlock protection device for an intelligent ignition control cabinet, comprising an explosion-proof cabinet and a signal acquisition component. The explosion-proof cabinet contains an interlock control unit, which includes a PLC controller, a safety relay, and a backup power module. The PLC controller is electrically connected to the safety relay and the backup power module. The signal acquisition component is installed outside the explosion-proof cabinet and includes a gas pressure sensor, a wind pressure sensor, a temperature sensor, a flame detector, and a door limit switch. The gas pipeline, combustion air duct / damper, ignition area, and ignition nozzle of the external ignition system are equipped with gas pressure sensors, air pressure sensors, temperature sensors, and flame detectors, respectively. The limit switch of the cabinet door is embedded in the inside of the front door of the explosion-proof cabinet. An actuator is also provided on the outside of the explosion-proof cabinet, and the actuator includes a gas shut-off valve, an ignition prohibition relay, and an audible and visual alarm. The gas shut-off valve is installed in the gas inlet pipeline, the ignition prohibition relay is integrated into the ignition control circuit inside the explosion-proof cabinet, and an audible and visual alarm is fixed on the top of the explosion-proof cabinet.

[0007] Furthermore, the gas pressure sensor, wind pressure sensor, temperature sensor, flame detector, and cabinet door limit switch are all electrically connected to the input terminal of the PLC controller via shielded cables, and the shielded cables are fixedly laid along the outside of the pipeline or explosion-proof cabinet.

[0008] Furthermore, the gas shut-off valve, ignition interruption relay, and audible and visual alarm are all electrically connected to the output terminal of the PLC controller via control lines, and the gas shut-off valve is an electromagnetic structure.

[0009] Furthermore, the explosion-proof cabinet's front door panel is equipped with a human-machine interface module, which includes a touch screen and an emergency stop button, the emergency stop button being located on the explosion-proof cabinet's front door panel.

[0010] Furthermore, the touchscreen is bidirectionally connected to the PLC controller, and the emergency stop button is directly electrically connected to the safety relay.

[0011] Furthermore, the emergency stop button has a mushroom-shaped self-locking structure, and both the shielded cable and the control cable are armored shielded cables.

[0012] This utility model provides a safety interlock protection device for an intelligent ignition control cabinet, which has the following beneficial effects:

[0013] 1. This utility model covers key parameters such as gas pressure, air pressure, temperature, flame, and cabinet door through signal acquisition components. Each sensor transmits signals through armored shielded cables, realizing full-scene monitoring before ignition, during ignition, and during operation. This improves the safety monitoring dimension by more than 3 times compared to traditional devices, eliminating hidden dangers such as "gas leaks not detected" and "mis-ignition due to damper not being in place." Furthermore, with a PLC controller as the core, it links safety relays and actuators to construct a "monitoring-judgment-execution" system interlocking logic, avoiding the protection disorder problems of traditional devices without a unified central control. The electromagnetic gas shut-off valve responds quickly, the audible and visual alarm provides timely warnings, and the backup power module ensures uninterrupted power outage protection, comprehensively improving the safety and reliability of the ignition system and adapting to the high-efficiency operation requirements of industrial combustion scenarios.

[0014] 2. This utility model eliminates the need for manual intervention throughout the entire process, from multi-parameter safety confirmation before ignition to flame monitoring during ignition and abnormal protection during operation. Operators only need to view the system status in real time via the touch screen on the front panel of the explosion-proof cabinet. Compared with traditional devices that require frequent manual parameter checks and manual triggering of protection, this significantly reduces the cost of manual intervention and the probability of errors. In addition, the mushroom-shaped self-locking emergency stop button requires both pressing and rotating to reset, which can prevent accidental shutdowns caused by accidental contact. Furthermore, the ignition prohibition relay only unlocks when safety conditions are met, avoiding forced ignition by manual intervention. This comprehensively reduces the risk of operational errors and ensures the safe operation of the ignition system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a safety interlock protection device for an intelligent ignition control cabinet according to this utility model;

[0016] Figure 2This is a schematic diagram of the circuit principle of a safety interlock protection device for an intelligent ignition control cabinet according to this utility model.

[0017] In the diagram: 1. Explosion-proof cabinet; 2. Interlocking control unit; 201. PLC controller; 202. Safety relay; 203. Backup power module; 3. Signal acquisition component; 301. Gas pressure sensor; 302. Wind pressure sensor; 303. Temperature sensor; 304. Flame detector; 305. Cabinet door limit switch; 4. Actuator; 401. Gas shut-off valve; 402. Ignition prohibition relay; 403. Audible and visual alarm; 5. Human-machine interaction module; 501. Touch screen; 502. Emergency stop button. Detailed Implementation

[0018] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0019] like Figure 1 and Figure 2 As shown, a safety interlock protection device for an intelligent ignition control cabinet includes an explosion-proof cabinet 1 and a signal acquisition component 3. An interlock control unit 2 is installed inside the explosion-proof cabinet 1, and the interlock control unit 2 includes a PLC controller 201, a safety relay 202, and a backup power module 203. The PLC controller 201 is electrically connected to the safety relay 202 and the backup power module 203. The signal acquisition component 3 is installed outside the explosion-proof cabinet 1, and includes a gas pressure sensor 301, a wind pressure sensor 302, a temperature sensor 303, a flame detector 304, and a cabinet door limit switch 305. Gas pressure sensors 301, wind pressure sensors 302, temperature sensors 303, and flame detectors 304 are installed at monitoring points such as the gas pipeline, combustion air duct / damper, ignition area, and ignition nozzle of the ignition system outside the explosion-proof cabinet 1. The cabinet door limit switch 305... 05 is embedded inside the front door of the explosion-proof cabinet 1. The gas pressure sensor 301, wind pressure sensor 302, temperature sensor 303, flame detector 304, and cabinet door limit switch 305 are all electrically connected to the input terminal of the PLC controller 201 through shielded cables. The shielded cables are fixedly laid along the pipeline or the outside of the explosion-proof cabinet 1. An actuator 4 is also provided on the outside of the explosion-proof cabinet 1. The actuator 4 includes a gas shut-off valve 401, an ignition prohibition relay 402, and an audible and visual alarm 403. The gas shut-off valve 401 is installed in the gas inlet pipeline. The ignition prohibition relay 402 is integrated into the ignition control circuit inside the explosion-proof cabinet 1. An audible and visual alarm 403 is fixed on the top of the explosion-proof cabinet 1. The gas shut-off valve 401, the ignition prohibition relay 402, and the audible and visual alarm 403 are all electrically connected to the output terminal of the PLC controller 201 through control lines. The gas shut-off valve 401 is an electromagnetic structure.

[0020] The specific operation is as follows: the signal acquisition component 3 covers five key parameters: gas pressure, air pressure, temperature, flame, and cabinet door. Each sensor transmits signals through armored shielded cables, realizing full-scene monitoring before ignition, during ignition, and during operation. This improves the safety monitoring dimension by more than three times compared to traditional devices, eliminating hidden dangers such as "gas leaks not detected" and "mis-ignition due to damper not being in place." Furthermore, with the PLC controller 201 as the core, it links the safety relay 202 and the actuator 4 to construct a "monitoring-judgment-execution" system interlocking logic, avoiding the protection disorder problems of traditional devices without a unified central control. The electromagnetic gas shut-off valve 401 responds quickly, the audible and visual alarm 403 provides timely warnings, and the backup power module 203 ensures uninterrupted power outage protection. This comprehensively improves the safety and reliability of the ignition system, adapting to the high-efficiency operation requirements of industrial combustion scenarios.

[0021] like Figure 1 and Figure 2 As shown, the explosion-proof cabinet 1 has a human-machine interface module 5 embedded in the front door panel. The human-machine interface module 5 includes a touch screen 501 and an emergency stop button 502. The emergency stop button 502 is located on the front door panel of the explosion-proof cabinet 1. The touch screen 501 is bidirectionally connected to the PLC controller 201. The emergency stop button 502 is directly electrically connected to the safety relay 202. The emergency stop button 502 has a mushroom-shaped self-locking structure. The shielded cable and the control cable are both armored shielded cables.

[0022] The specific operation is as follows: from multi-parameter safety confirmation before ignition, to flame monitoring during ignition, and then to abnormal protection during operation, the entire process does not require manual intervention. Operators only need to view the system status in real time through the touch screen 501 on the front panel of the explosion-proof cabinet 1. Compared with the traditional device, which requires frequent manual parameter checks and manual triggering of protection, this greatly reduces the cost of manual intervention and the probability of error. In addition, the mushroom-shaped self-locking emergency stop button 502 requires both pressing and rotating to reset, which can prevent accidental shutdown caused by accidental contact. Moreover, the ignition prohibition relay 402 is only unlocked when the safety conditions are met, avoiding manual forced ignition. This comprehensively reduces the risk of operational errors and ensures the safe operation of the ignition system.

[0023] In summary, the safety interlock protection device for this intelligent ignition control cabinet, when in use, firstly, before ignition, when the operator closes the front door of the explosion-proof cabinet 1, the cabinet door limit switch 305 embedded inside the front door triggers a "door closed" signal, which is transmitted to the input terminal of the PLC controller 201 through the armored shielded cable. At the same time, the signal acquisition component 3 installed at the external monitoring point synchronously collects key parameters. The gas pressure sensor 301 on the gas pipeline monitors the gas pressure in real time to ensure that the pressure is within the safe threshold and to avoid gas leakage or abnormal pressure. The air pressure sensor 302 at the combustion air duct / damper detects the combustion air pressure to confirm that the damper is in place and to prevent oxygen deficiency combustion or backfire. The temperature sensor 303 next to the ignition area monitors the ambient temperature to ensure that there is no high temperature hazard.

[0024] The PLC controller 201 performs logical operations on all signals. Only when the cabinet door is closed, the gas pressure is within the standard range, the air pressure is within the standard range, and the temperature is normal, will the ignition prohibition be lifted through the safety relay 202. At this time, the PLC controller 201 sends an "Ignition Allowed" command to the ignition prohibition relay 402 (ignition control circuit inside the explosion-proof cabinet 1). The operator can start the ignition operation through the touch screen 501. If any parameter fails to meet the standard, the PLC controller 201 immediately locks the ignition circuit, the audible and visual alarm 403 triggers an audible and visual warning, and the touch screen 501 displays the specific fault.

[0025] After the ignition command is issued, the flame detector 304 installed next to the ignition nozzle continuously captures the flame signal and transmits the "flame presence or absence" signal to the PLC controller 201 through the armored shielded cable. If a flame is detected within 3 seconds, the PLC controller 201 determines that the ignition is successful and maintains the gas shut-off valve 401 on the gas intake pipeline in the open state to ensure normal gas supply. If no flame is detected within 3 seconds, the PLC controller 201 immediately determines that the ignition has failed and simultaneously executes triple protection: ① sends an "emergency shutdown" command to the gas shut-off valve 401 (the electromagnetic structure cuts off the gas within 1.5 seconds), ② triggers the ignition prohibition relay 402 to cut off the ignition circuit, ③ activates the audible and visual alarm 403, and the touch screen 501 records the "ignition failure" fault code to prevent unburned gas from accumulating and causing an explosion.

[0026] When the ignition system is running normally, the signal acquisition component 3 continuously monitors various parameters, and the PLC controller 201 analyzes the data in real time. If the gas pressure exceeds the standard, the wind pressure drops suddenly, the temperature exceeds the limit, or the cabinet door is opened abnormally, the PLC controller 201 immediately starts the emergency shutdown procedure, cuts off the gas shut-off valve 401 and the ignition prohibition relay 402, and the audible and visual alarm 403 continues to alarm.

[0027] If the main power supply suddenly fails, the backup power module 203 in the explosion-proof cabinet 1 will automatically switch power supply to maintain the PLC controller 201, safety relay 202 and audible and visual alarm 403 working for ≥30 minutes, ensuring that emergency protection actions can still be completed after the power failure, and avoiding the risk of loss of control.

[0028] In the event of an extreme anomaly (such as automatic protection failure), the operator can press the mushroom-shaped self-locking emergency stop button 502 on the front door panel of the explosion-proof cabinet 1 to instantly cut off the power to the ignition prohibition relay 402 and the gas shut-off valve 401, forcing a shutdown. At the same time, the touch screen 501 locks the operation interface, and the machine can only be restarted after resetting the emergency stop button to avoid misoperation.

[0029] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A safety interlock protection device for an intelligent ignition control cabinet, comprising an explosion-proof cabinet (1) and a signal acquisition component (3), characterized in that, The explosion-proof cabinet (1) is equipped with an interlocking control unit (2), which includes a PLC controller (201), a safety relay (202), and a backup power module (203). The PLC controller (201) is electrically connected to the safety relay (202) and the backup power module (203). The signal acquisition component (3) is installed outside the explosion-proof cabinet (1) and includes a gas pressure sensor (301), a wind pressure sensor (302), a temperature sensor (303), a flame detector (304), and a door limit switch (305). The gas pipeline, combustion air duct / damper, and ignition system of the ignition system outside the explosion-proof cabinet (1) are connected to the explosion-proof cabinet (1). Gas pressure sensor (301), wind pressure sensor (302), temperature sensor (303) and flame detector (304) are installed at monitoring points such as the area and ignition nozzle. The door limit switch (305) is embedded in the inside of the front door of the explosion-proof cabinet (1). An actuator (4) is also provided on the outside of the explosion-proof cabinet (1). The actuator (4) includes a gas shut-off valve (401), an ignition prohibition relay (402) and an audible and visual alarm (403). The gas shut-off valve (401) is installed in the gas inlet pipe. The ignition prohibition relay (402) is integrated into the ignition control circuit inside the explosion-proof cabinet (1). An audible and visual alarm (403) is fixed on the top of the explosion-proof cabinet (1).

2. The intelligent ignition control cabinet safety interlock protection device according to claim 1, characterized in that, The gas pressure sensor (301), wind pressure sensor (302), temperature sensor (303), flame detector (304), and cabinet door limit switch (305) are all electrically connected to the input terminal of the PLC controller (201) via shielded cables, and the shielded cables are fixedly laid along the outside of the pipe or explosion-proof cabinet (1).

3. The intelligent ignition control cabinet safety interlock protection device according to claim 1, characterized in that, The gas shut-off valve (401), ignition interruption relay (402), and audible and visual alarm (403) are all electrically connected to the output terminal of the PLC controller (201) via control lines, and the gas shut-off valve (401) is an electromagnetic structure.

4. The intelligent ignition control cabinet safety interlock protection device according to claim 2, characterized in that, The explosion-proof cabinet (1) has a human-machine interaction module (5) embedded in the front door panel, and the human-machine interaction module (5) includes a touch screen (501) and an emergency stop button (502), which is located on the front door panel of the explosion-proof cabinet (1).

5. A safety interlock protection device for an intelligent ignition control cabinet according to claim 4, characterized in that, The touch screen (501) is bidirectionally connected to the PLC controller (201), and the emergency stop button (502) is directly electrically connected to the safety relay (202).

6. A safety interlock protection device for an intelligent ignition control cabinet according to claim 4, characterized in that, The emergency stop button (502) has a mushroom-shaped self-locking structure, and both the shielded cable and the control cable are armored shielded cables.

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