CN111604493A - Tundish baking protection system and method - Google Patents
Tundish baking protection system and method Download PDFInfo
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- CN111604493A CN111604493A CN202010568481.1A CN202010568481A CN111604493A CN 111604493 A CN111604493 A CN 111604493A CN 202010568481 A CN202010568481 A CN 202010568481A CN 111604493 A CN111604493 A CN 111604493A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
- B22D41/01—Heating means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D46/00—Controlling, supervising, not restricted to casting covered by a single main group, e.g. for safety reasons
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Abstract
The invention discloses a tundish baking protection system which comprises a roaster, a tundish and a PLC (programmable logic controller), wherein the tundish is arranged below the roaster, the roaster comprises a plurality of burners, a coal gas branch pipe and an air branch pipe, and the burners are arranged at intervals and in the middle along the length direction of the tundish; an electronic igniter and a flame detector are arranged in the burner, and the burner is communicated with the gas branch pipe; the gas branch pipe is provided with a gas flow detector, a gas stop valve and a gas flow regulating valve; the burner is communicated with the air branch pipe; an air flow detector, an air stop valve and an air flow regulating valve are arranged on the air branch pipe; and each detector, each valve and the electronic igniter are respectively connected with the PLC. The invention has the beneficial effects that: the protection system can be used for protection in two modes, namely an overhaul mode and a baking mode, and effectively ensures that the safety of the baking area of the tundish in each working state is controlled.
Description
Technical Field
The invention relates to the technical field of tundish baking in the steel industry, in particular to a tundish baking protection system and a tundish baking protection method.
Background
The tundish roaster mainly plays a role in roasting the tundish, is an important link of the whole continuous casting production process, and is one of several key quality control points. At present, the bakie is toasted and is generally adopted artifical mode to operate, whether possess also lack the control to its baking process, maintenance condition, its main following problem that exists: the potential safety hazard exists due to manual ignition; during the baking period of the tundish, whether a person enters a baking area or not is effectively monitored and reminded; whether the system has gas leakage or not cannot be predicted; whether the content of the coal gas exceeds the standard or not and whether the equipment in the tundish area can be overhauled or not cannot be judged; the absence of detection that the various valves are installed to command closure is normal.
With the development of artificial intelligence technology and the construction of urban intelligent steel mills, how to further reduce the labor intensity of workers and ensure the life safety of the workers is very important. But at present, an effective system for ensuring the baking safety of the tundish is lacked.
Disclosure of Invention
The invention aims to provide a tundish baking protection system and a tundish baking protection method which can be used for safety protection in an overhaul mode and a baking mode aiming at the defects of the prior art.
The technical scheme adopted by the invention is as follows: a tundish baking protection system comprises a roaster, a tundish and a PLC (programmable logic controller), wherein the tundish is arranged below the roaster, the roaster comprises a plurality of burners, a coal gas branch pipe and an air branch pipe, and the burners are arranged at intervals and in the middle along the length direction of the tundish; an electronic igniter and a flame detector are arranged in the burner, the burner is communicated with a gas branch pipe, and the gas branch pipe is connected with a gas supply system; the gas branch pipe is provided with a gas flow detector, a gas stop valve and a gas flow regulating valve; the burner is communicated with an air branch pipe, and the air branch pipe is connected with an air supply system; an air flow detector, an air stop valve and an air flow regulating valve are arranged on the air branch pipe; the electronic igniter, the flame detector, the coal gas stop valve, the air stop valve, the coal gas flow detector, the coal gas flow regulating valve, the air flow detector and the air flow regulating valve are respectively connected with the PLC; and the PLC receives the detection information sent by each detector and controls the opening and closing of the electronic igniter and each valve.
According to the scheme, a plurality of gas detectors connected with the PLC are distributed around the tundish and used for detecting the gas content of the tundish baking area and sending the gas content information to the PLC.
According to the scheme, a plurality of grating sensors connected with the PLC are designed on the periphery of the tundish to form a closed protective light curtain, and the PLC judges whether personnel enter the tundish baking area or not by judging whether the grating sensors are shielded.
According to the scheme, one side of the tundish is provided with a plurality of temperature measuring guns connected with the PLC, and the temperature measuring guns are used for detecting the temperature of the tundish and sending the temperature information to the PLC.
The invention also provides a safety maintenance method based on the protection system, which comprises the following steps:
step one, after switching to the maintenance mode, whether flame exists in the nozzle is detected by the flame detector, and the information is sent to the PLC: if the flame is detected, the PLC controls the gas stop valve and the electronic igniter to be closed until the flame is extinguished; if no flame is detected, entering the step two;
step two, the temperature measuring gun detects the temperature of the tundish and sends the temperature information to the PLC, the PLC receives the temperature information and analyzes whether the temperature information is less than 30 ℃, if the received temperature of the tundish is more than or equal to 30 ℃, the PLC controls the air supply system to be started, the tundish is cooled by the air supply system until the temperature of the tundish is less than 30 ℃, and the step three is carried out;
thirdly, the gas detector detects the gas concentration around the tundish and sends the gas concentration information to the PLC, and the PLC receives the gas concentration information and analyzes whether the gas concentration information is less than 30mg/m3If the concentration of the received coal gas is more than or equal to 30mg/m3Controlling the air supply system to continuously purge the tundish working area until the gas concentration is less than 30mg/m3Entering the step four;
step four, detecting the gas flow in each gas branch pipe by a gas flow detector, sending the gas flow information to a PLC (programmable logic controller), receiving the gas flow information by the PLC, analyzing whether the gas flow information is 0, if the received gas flow is not 0, manually confirming on site until the gas flow received by the PLC is 0, ensuring the whole working environment to be safe, and entering step five;
step five, controlling the power failure of the grating sensor by the PLC, and enabling a worker to enter a tundish baking area for maintenance operation; inputting an overhaul ending signal after the overhaul is finished, and entering a sixth step;
and step six, the PLC controls the air flow regulating valve and the air stop valve to be closed, the air supply system stops supplying air, meanwhile, the PLC controls the grating sensor to be powered on, and real-time monitoring of the personnel entering and exiting conditions of the tundish baking area is recovered.
The invention also provides a safe baking method based on the protection system as claimed in claim 4, which comprises the following steps:
step one, switching a working mode to a baking mode, and controlling each valve to be opened by a PLC controller to provide gas and combustion air for a burner; turning on the automatic igniter and delaying to continuously ignite the burner, and entering the step two;
step two, the flame detector detects whether the burner has flame, and sends the information to the PLC controller: if the flame is detected, entering a step three; if the flame is not detected, manually removing the fault;
thirdly, the gas detector detects the gas concentration around the tundish and sends the gas concentration information to the PLC, and the PLC receives the gas concentration information and analyzes whether the gas concentration information is less than 30mg/m3If the concentration of the received coal gas is more than or equal to 30mg/m3Manually checking the leakage points of the whole system; if the received gas concentration is less than 30mg/m3Entering the step four;
step four, if the baking end signal is not received, skipping to step two; if the baking end signal is received, entering a fifth step;
step five, the PLC controls each valve to be closed, a flame detector is used for detecting whether flame exists in the burner, and if flame exists, faults are manually checked; when the flame is not detected, entering a sixth step;
step six, detecting the gas flow in each gas branch pipe by a gas flow detector, sending the gas flow information to a PLC (programmable logic controller), analyzing whether the received gas flow is 0 or not by the PLC, and manually checking on site if the received gas flow is not 0; if the received gas flow is 0, the whole process is finished.
The invention has the beneficial effects that: the protection system can be used for protection in two middle modes, namely an overhaul mode and a baking mode, and effectively ensures that the safety of a tundish baking area is controlled in each working state; the automatic igniter is utilized to realize the automatic ignition function of the burner, and the hidden danger of unsafe manual ignition is solved; the flame detector is used for detecting the flame condition of the burner, so that an accurate judgment basis is provided for judging whether the automatic igniter can work normally; the gas detector can be used for detecting the gas concentration of the baking area of the tundish in real time, and the PLC judges whether the protection system has gas leakage or not and whether the protection system meets the maintenance working condition or not; the temperature measuring gun is used for monitoring the temperature of the tundish in real time, and the PLC is used for monitoring the baking condition and the temperature condition of the tundish in real time; detecting the gas flow in the pipe by using each flow valve, judging whether gas exists in the pipeline by using a PLC (programmable logic controller), and controlling the working state of a gas stop valve; a rectangular closed protective light curtain is established by utilizing the grating sensor, whether a person enters a baking area is judged by judging whether a signal is shielded, and the safety problem caused by the fact that the person enters the baking area by mistake is solved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a flowchart of the maintenance mode of the present embodiment.
FIG. 3 is a flowchart illustrating a baking mode according to the present embodiment.
Wherein: 1. a grating sensor; 2. a tundish; 3. a gas detector; 4. burning a nozzle; 5. an electronic igniter; 6. a flame detector; 7. a gas branch pipe; 8. an air branch pipe; 9. a gas flow regulating valve; 10. an air flow regulating valve; 11. a gas flow detector; 12. an air flow detector; 13. a temperature measuring gun; 14. air branch pipes; 15. dividing the coal gas into pipes; 16. an air manifold; 17. an air supply system; 18. a gas supply system; 19. a gas main pipe; 20. an air shutoff valve; 21. a gas stop valve.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
The tundish baking protection system shown in fig. 1 comprises a baking device, a tundish 2 arranged below the baking device and a PLC (programmable logic controller), wherein the baking device comprises a plurality of burners 4, a gas branch pipe 7 and an air branch pipe 8, and the burners 4 are arranged at intervals and in the middle along the length direction of the tundish 2; an electronic igniter 5 and a flame detector 6 are arranged in the burner 4, the burner 4 is communicated with a gas branch pipe 7, the gas branch pipe 7 is communicated with a gas main pipe 19 through a gas branch pipe 15, and the gas main pipe 19 is connected with a gas supply system 18; the gas branch pipe 7 is provided with a gas flow detector 11, a gas stop valve 21 and a gas flow regulating valve 9; the burner 4 is communicated with an air branch pipe 8, the air branch pipe 8 is communicated with an air main pipe through an air branch pipe 14, and the air main pipe is connected with an air supply system 17; an air flow detector 12, an air stop valve 20 and an air flow regulating valve 10 are arranged on the air branch pipe 8; the electronic igniter 5, the flame detector 6, the coal gas stop valve 21, the air stop valve 20, the coal gas flow detector 11, the coal gas flow regulating valve 9, the air flow detector 12 and the air flow regulating valve 10 are respectively connected with the PLC; the PLC controller receives the detection information transmitted from each detector, and controls the opening and closing of the electronic igniter 5 and each valve.
Preferably, a plurality of gas detectors 3 connected with the PLC are distributed around the tundish 2 and used for detecting the gas content in the baking area of the tundish 2 and sending the gas content information to the PLC.
Preferably, a plurality of grating sensors 1 connected with a PLC controller are designed on the periphery of the tundish 2 to form a closed protective light curtain, and the PLC controller determines whether a person enters the baking area of the tundish 2 through whether the grating sensors 1 are shielded.
Preferably, one side of the tundish 2 is provided with a plurality of temperature measuring guns 13 connected with the PLC controller, and the temperature measuring guns are used for detecting the temperature of the tundish 2 and sending the temperature information to the PLC controller.
In the invention, the tundish 2 is a main device to be roasted and heated and is arranged below the roaster; the roaster mainly comprises a burner 4, a gas branch pipe 7, an air branch pipe 8, a gas flow regulating valve 9, an air flow regulating valve 10, a gas flow detector 11, an air flow detector 12, an air branch pipe 14, a gas branch pipe 15, an air main pipe 16, an air supply system 17, a gas supply system 18, a gas main pipe 19, an air stop valve 20 and a gas stop valve 21; the middle ladle 2 is baked by burning coal gas through the burners 4, an electronic igniter 5 and a flame detector 6 are designed in each burner 4, the electronic igniter 5 is used for automatically igniting the burner 4, and the flame detector 6 is used for detecting whether the burner 4 is ignited or not and whether flame exists or not; each burner 4 is supplied with gas by a gas branch pipe 7 and an air branch pipe 8, wherein each gas branch pipe 7 is provided with a gas flow regulating valve 9, a gas flow detector 11 and a gas stop valve 21, the gas flow regulating valve 9 is used for regulating the gas amount, the gas stop valve 21 is used for controlling the on-off of a gas conveying pipeline, and the gas flow detector 11 is used for detecting the actual gas flow in the gas branch pipe 7; similarly, each air branch pipe 8 is provided with an air flow regulating valve 10, an air flow detector 12 and an air stop valve 20, wherein the air flow regulating valve 10 is used for regulating the air flow in the air branch pipe 8, the air stop valve 20 is used for controlling the passage of the air branch pipe 8, and the air flow detector 12 is used for detecting the actual air flow in the air branch pipe 8; the gas branch pipes 7 of the plurality of burners 4 are all connected to a gas main pipe 19, and a gas supply system 18 is used for supplying gas for the whole pipeline; the air branch pipes 8 of the plurality of burners 4 are all connected to an air main pipe 16, and an air supply system 17 is used for providing air for the whole pipeline; a plurality of gas detectors 3 are distributed around the tundish 2 and used for detecting the gas content in the baking area of the tundish 2 and ensuring the safety of baking production and maintenance operation; a plurality of temperature measuring guns 13 are designed on one side of the tundish 2 and used for measuring the temperature of the tundish 2, and the PLC judges whether the tundish 2 meets the baking requirement or the maintenance condition or not according to the temperature of the tundish 2; the periphery of the tundish 2 is provided with a plurality of grating sensors 1 to form a rectangular enclosed protective light curtain, and the PLC judges whether a person enters a baking area or not by judging whether the grating sensors 1 are shielded.
The tundish 2 baking protection system of the invention is established with two working modes, namely a maintenance mode and a baking mode, according to the working requirements; the overhaul mode is used for judging whether the baking area of the tundish 2 meets overhaul conditions or not, and carrying out automatic treatment when the conditions are not met so that the baking area meets overhaul operation conditions; the baking mode is used for monitoring all key links and safety-affecting factors in the baking process of the tundish 2 in real time, automatically judging and reminding different fault problems, and ensuring the baking safety of the tundish 2.
As shown in fig. 2, a safety maintenance method based on the protection system specifically includes the following steps:
step one, after the user switches the working mode to the maintenance mode, the flame detector 6 detects whether the burner 4 has flame, and sends the information to the PLC controller: if the flame is detected, the PLC controls the gas stop valve 21 and the electronic igniter 5 to be closed until the flame is extinguished; if no flame is detected, entering the step two;
step two, the temperature measuring gun 13 detects the temperature of the tundish 2 and sends the temperature information to the PLC controller, the PLC controller receives the temperature information and analyzes whether the temperature information is less than 30 ℃, if the received temperature of the tundish 2 is more than or equal to 30 ℃, the PLC controller controls the air supply system 17 to be started, the air flow regulating valve 10 and the air stop valve 20 are opened, the tundish 2 is cooled by the air supply system 17 until the temperature of the tundish 2 is less than 30 ℃, and the step three is carried out;
step three, the gas detector 3 detects the gas concentration around the tundish 2 and sends the gas concentration information to the PLC controller, and the PLC controller receives the gas concentration information and analyzes whether the gas concentration information is less than 30mg/m3If the concentration of the received coal gas is more than or equal to 30mg/m3Controlling the air supply system 17 to continuously purge the working area of the tundish 2 until the gas concentration is less than 30mg/m3Entering the step four;
step four, the gas flow detector 11 detects the gas flow in each gas branch pipe 7 and sends the gas flow information to the PLC, the PLC receives the gas flow information and analyzes whether the gas flow information is 0, if the received gas flow is not 0, the phenomenon that the gas stop valve 21 is not tightly closed and leaks gas is shown, a worker wears a respirator to confirm on site until the gas flow received by the PLC is 0, the whole working environment is safe, and the step five is carried out;
step five, the PLC controller controls the grating sensor 1 to lose power, and a worker enters a baking area of the tundish 2 to carry out maintenance operation; inputting an overhaul ending signal after the overhaul is finished, and entering a sixth step;
and step six, the PLC controls the air flow regulating valve 10 and the air stop valve 20 to be closed, the air supply system 17 stops supplying air, meanwhile, the PLC controls the grating sensor 1 to be powered on, and real-time monitoring of the personnel entering and exiting conditions of the baking area of the tundish 2 is recovered.
As shown in fig. 3, a safe baking method based on the protection system includes the following steps:
step one, when a user switches a working mode to a baking mode, a PLC controller controls each valve to be opened to provide gas and combustion air for a burner 4; turning on the automatic igniter and delaying for 3s to continuously ignite the burner 4, and entering the step two;
step two, the flame detector 6 detects whether the burner 4 has flame, and sends the information to the PLC: if the flame is detected, entering a step three; if flame is not detected, the automatic igniter is indicated to have a fault, and manual removal is carried out;
step three, the gas detector 3 detects the gas concentration around the tundish 2 and sends the gas concentration information to the PLC controller, and the PLC controller receives the gas concentration information and analyzes whether the gas concentration information is less than 30mg/m3If the concentration of the received coal gas is more than or equal to 30mg/m3The coal gas leakage of the whole baking system is shown, and the leakage points of the whole system are manually checked; if the received gas concentration is less than 30mg/m3If the system works normally, entering the step four;
step four, when the baking end signal is not received, automatically jumping to the step two; entering a fifth step after receiving a baking end signal; in the actual production process, each continuous casting machine has two tundishes in total, if the continuous casting machines are ready to start casting, one tundish is baked, the other tundish is in an idle state, when the continuous casting machines are ready to start casting on site, a ready-to-cast signal lamp is on, meanwhile, a PLC controller transmits a baking end signal to a baking position tundish, and the baking position tundish stops baking; if the continuous casting machine is in the continuous casting process, one tundish is in a casting position, the other tundish is in a baking state, when the ladle changing operation is carried out on site, a ladle changing casting signal lamp is on, the tundish in the casting position is opened, meanwhile, a baking end signal is transmitted to the tundish in the baking position by the PLC, and the tundish in the baking position stops baking;
step five, the PLC controller controls each valve to be closed, after time delay of 10s, the flame detector 6 is used for detecting whether flame exists in the burner 4, if flame exists, the control system is proved to have a fault, and manual troubleshooting is carried out; when the flame is not detected, entering a sixth step;
step six, the gas flow detector 11 detects the gas flow in each gas branch pipe 7 and sends the gas flow information to the PLC, the PLC analyzes whether the received gas flow is 0 or not, if the received gas flow is not 0, the phenomenon that the gas stop valve 21 is not tightly closed and leaks gas is shown, and workers wear the respirator to check on site; if the received gas flow is 0, the whole process is finished.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (6)
1. The tundish baking protection system is characterized by comprising a roaster, a tundish and a PLC (programmable logic controller), wherein the tundish is arranged below the roaster, the roaster comprises a plurality of burners, a coal gas branch pipe and an air branch pipe, and the burners are arranged at intervals and in the middle along the length direction of the tundish; an electronic igniter and a flame detector are arranged in the burner, the burner is communicated with a gas branch pipe, and the gas branch pipe is connected with a gas supply system; the gas branch pipe is provided with a gas flow detector, a gas stop valve and a gas flow regulating valve; the burner is communicated with an air branch pipe, and the air branch pipe is connected with an air supply system; an air flow detector, an air stop valve and an air flow regulating valve are arranged on the air branch pipe; the electronic igniter, the flame detector, the coal gas stop valve, the air stop valve, the coal gas flow detector, the coal gas flow regulating valve, the air flow detector and the air flow regulating valve are respectively connected with the PLC; and the PLC receives the detection information sent by each detector and controls the opening and closing of the electronic igniter and each valve.
2. The tundish baking protection system of claim 1, wherein a plurality of gas detectors connected to the PLC controller are distributed around the tundish to detect the gas content in the tundish baking area and send the gas content information to the PLC controller.
3. The tundish baking protection system of claim 2, wherein a plurality of grating sensors connected to the PLC controller are designed on the periphery of the tundish to form a closed protection light curtain, and the PLC controller determines whether a person enters the tundish baking area by whether the grating sensors are shielded.
4. A tundish baking protection system as claimed in any one of claims 1 to 3, wherein a plurality of temperature measuring guns are arranged on one side of the tundish and connected to the PLC controller for detecting the temperature of the tundish and sending the temperature information to the PLC controller.
5. A safety-based maintenance method based on the protection system of claim 4, characterized in that the method comprises the following steps:
step one, after switching to the maintenance mode, whether flame exists in the nozzle is detected by the flame detector, and the information is sent to the PLC: if the flame is detected, the PLC controls the gas stop valve and the electronic igniter to be closed until the flame is extinguished; if no flame is detected, entering the step two;
step two, the temperature measuring gun detects the temperature of the tundish and sends the temperature information to the PLC, the PLC receives the temperature information and analyzes whether the temperature information is less than 30 ℃, if the received temperature of the tundish is more than or equal to 30 ℃, the PLC controls the air supply system to be started, the tundish is cooled by the air supply system until the temperature of the tundish is less than 30 ℃, and the step three is carried out;
thirdly, the gas detector detects the gas concentration around the tundish and sends the gas concentration information to the PLC, and the PLC receives the gas concentration information and analyzes whether the gas concentration information is less than 30mg/m3If the concentration of the received coal gas is more than or equal to 30mg/m3Controlling the air supply system to continuously purge the working area of the tundishUntil the gas concentration is less than 30mg/m3Entering the step four;
step four, detecting the gas flow in each gas branch pipe by a gas flow detector, sending the gas flow information to a PLC (programmable logic controller), receiving the gas flow information by the PLC, analyzing whether the gas flow information is 0, if the received gas flow is not 0, manually confirming on site until the gas flow received by the PLC is 0, ensuring the whole working environment to be safe, and entering step five;
step five, controlling the power failure of the grating sensor by the PLC, and enabling a worker to enter a tundish baking area for maintenance operation; inputting an overhaul ending signal after the overhaul is finished, and entering a sixth step;
and step six, the PLC controls the air flow regulating valve and the air stop valve to be closed, the air supply system stops supplying air, meanwhile, the PLC controls the grating sensor to be powered on, and real-time monitoring of the personnel entering and exiting conditions of the tundish baking area is recovered.
6. A safe baking method based on the protection system of claim 4, characterized in that the method comprises the following steps:
step one, switching a working mode to a baking mode, and controlling each valve to be opened by a PLC controller to provide gas and combustion air for a burner; turning on the automatic igniter and delaying to continuously ignite the burner, and entering the step two;
step two, the flame detector detects whether the burner has flame, and sends the information to the PLC controller: if the flame is detected, entering a step three; if the flame is not detected, manually removing the fault;
thirdly, the gas detector detects the gas concentration around the tundish and sends the gas concentration information to the PLC, and the PLC receives the gas concentration information and analyzes whether the gas concentration information is less than 30mg/m3If the concentration of the received coal gas is more than or equal to 30mg/m3Manually checking the leakage points of the whole system; if the received gas concentration is less than 30mg/m3Entering the step four;
step four, if the baking end signal is not received, skipping to step two; if the baking end signal is received, entering a fifth step;
step five, the PLC controls each valve to be closed, a flame detector is used for detecting whether flame exists in the burner, and if flame exists, faults are manually checked; when the flame is not detected, entering a sixth step;
step six, detecting the gas flow in each gas branch pipe by a gas flow detector, sending the gas flow information to a PLC (programmable logic controller), analyzing whether the received gas flow is 0 or not by the PLC, and manually checking on site if the received gas flow is not 0; if the received gas flow is 0, the whole process is finished.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113670081A (en) * | 2021-07-26 | 2021-11-19 | 洛阳盛鑫工矿设备有限公司 | Safety protection system of baking oven |
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