CN117170300A - An automatic gas distribution and temperature rising sintering control device for soft ferrite - Google Patents

Abstract

The application discloses a soft magnetic ferrite automatic gas distribution heating sintering control device, which comprises: the system comprises a PLC controller, a heating system, a temperature control system, a cooling system, a gas distribution system, a pressure system, an oxygen measurement system and an upper computer; the heating system is used for heating the temperature in the sintering furnace; the temperature control system is electrically connected with the heating system and is used for collecting real-time temperature, setting the temperature in the furnace and controlling the heating system to heat the temperature in the furnace; the cooling system is used for conveying cooling water to a cooling circulation part of the sintering furnace for cooling after the temperature in the furnace reaches the set starting temperature of the cooling water; the gas distribution system is used for carrying out proportional gas distribution and mixing on different gases and conveying the mixed gases into the furnace; the pressure system is used for detecting the pressure in the furnace in real time, and opening pressure relief or stopping pressure relief based on the actual pressure condition; the oxygen measuring system is used for measuring the real-time value of the oxygen content in the furnace; the upper computer is used for man-machine interaction and control.

Description

An automatic gas distribution and temperature rising sintering control device for soft ferrite

Technical field

The invention belongs to the technical field of PLC control technology, and in particular relates to an automatic gas distribution and temperature rising sintering control device for soft ferrite.

Background technique

With the development of electronic information technology, soft ferrite materials tend to be more and more high-grade, small batches, multiple varieties, short delivery cycle, good consistency, etc. The previous push plate type atmosphere protection sintering kiln is gradually unable to meet this requirement. High-end products and changing requirements.

Automation equipment is increasingly used in the production processes of various industries. PLC control technology has become one of the core technologies of industrial automation, with the advantages of high reliability, efficiency, flexibility and easy maintenance. Automatic gas distribution and temperature rise control devices are widely used in various fields such as refractory materials, chemical ceramics, powder metallurgy, power energy, and new materials. The automatic gas distribution and temperature control device is a very important process in the production process of intelligent chemical plants. The accuracy of sintering control has a significant impact on the quality of the entire product.

Therefore, there is an urgent need for a highly automated and intelligent soft ferrite automatic gas distribution and temperature rising sintering control device.

Contents of the invention

In order to solve the above technical problems, the present invention proposes an automatic gas distribution and temperature rising sintering control device for soft ferrite, aiming to solve existing problems such as energy saving and consumption reduction, programmed temperature rise, pressure balance, automatic gas distribution, sampling oxygen measurement, record query, etc. Technical problems.

In order to achieve the above object, the present invention provides an automatic gas distribution and temperature rising sintering control device for soft ferrite, which includes:

PLC controller and the heating system, temperature control system, cooling system, gas distribution system, pressure system, oxygen measurement system and host computer electrically connected to the PLC controller;

The PLC controller is used to collect feedback information from other systems and perform control based on the feedback information;

The heating system is used to heat the furnace temperature of the sintering furnace;

The temperature control system is electrically connected to the heating system, and the temperature control system is used to collect real-time temperature, set the temperature in the furnace, and control the heating system to heat the temperature in the furnace;

The cooling system is used to transport the cooling water to the cooling cycle part of the sintering furnace for cooling after the temperature measuring element detects that the temperature in the furnace reaches the set opening temperature of the cooling water. When the temperature in the furnace drops below ℃, the cooling water Shut down.

The gas distribution system is used to proportionally mix different gases and transport the mixed gas to the furnace;

The pressure system is used to detect the pressure in the furnace in real time, and start or stop pressure relief based on the actual pressure situation;

The oxygen measuring system is used to measure the real-time value of oxygen content in the furnace and feed the oxygen content back to the PLC controller;

The host computer is used for human-computer interaction and control.

Optionally, the PLC controller includes a collection module, a communication module, a processing module, and an execution module;

The collection module is used to collect several types of furnace information, and perform analog-to-digital conversion on the collected furnace information to obtain digital signals. The furnace information includes gas flow information, air pressure information, water pressure information, and water flow information;

The communication module is used to read and write data to the constant current voltage regulation module, temperature control module, and oxygen meter through Modbus RTU and TCP communication methods;

The processing module is used to calculate and process the digital signals obtained by the acquisition module and obtain control instructions;

The execution module is used to receive control instructions from the PLC controller and output switching or analog signals to electromagnetic valves, pneumatic valves and three-phase power regulators.

Optionally, the temperature control system includes a temperature control module and a temperature measurement element; wherein,

The temperature measuring element is used to collect thermal electromotive force signals and feed back the thermal electromotive force signals to the temperature control module;

The temperature control module is used to receive the thermoelectromotive force signal, obtain the temperature rising signal, and transmit it to the heating system, and is also used to control the temperature based on the control instructions of the PLC controller.

Optionally, the heating system includes several heating elements and constant current voltage regulation modules; wherein,

Several of the heating elements are connected together through multiple series and angular connections;

The constant current voltage regulation module is used to receive a temperature rise signal from the temperature control module, and control several heating elements to perform heating based on the temperature rise signal.

Optionally, the cooling system includes a water pressure detection module, a water flow detection module, and a pneumatic valve control module; wherein,

The water pressure detection module is used to detect the incoming water pressure in real time. If the incoming water pressure is greater than or equal to the preset first water pressure threshold, an excessive water pressure signal is generated and transmitted to the PLC controller;

The water flow detection module is used to detect the water flow in real time. If the water flow is less than or equal to the preset first flow threshold, a flow cutoff signal is generated and transmitted to the PLC controller;

The pneumatic valve control module is used to turn on or off the cooling circulating water based on the control instructions of the PLC controller.

Optionally, the gas distribution system includes a gas flow module, a gas pressure detection module, and a gas distribution solenoid valve control module; wherein,

The gas flow module uses a gas mass flow controller to control the N2 or O2 flow into the furnace, and feeds real-time flow values and abnormal signals to the PLC controller;

The air pressure detection module is used to detect in real time whether the incoming air pressure is the first preset air pressure value. If so, the gas will be delivered normally; if not, an abnormal alarm will be generated and fed back to the PLC controller;

The gas distribution solenoid valve control module is used to open the valve after the gas distribution process is started.

Optionally, the pressure system includes a local pressure detection module, a remote pressure detection module and a valve-controlled exhaust module; wherein,

The local pressure detection module is used to detect the pressure in the furnace in real time. When the local pressure is greater than or equal to the first pressure setting value, the pressure relief valve is opened. When the local pressure is less than the first pressure setting value, the pressure relief valve is opened. valve closed;

The remote pressure detection module is used to remotely detect the pressure in the furnace in real time. If the remote pressure is greater than or equal to the preset second pressure value, an exhaust signal is generated and transmitted to the PLC controller. If the end pressure is less than the preset second pressure value, a valve closing signal is generated and transmitted to the PLC controller;

The valve-controlled exhaust module is used to receive control instructions from the PLC controller, and perform pressure relief or stop pressure relief according to the signal fed back by the remote pressure detection module.

Optionally, the oxygen measurement system includes a sampling pump, an oxygen meter and an oxygen measurement solenoid valve control module; wherein,

The sampling pump is used to extract gas;

The oxygen meter is used to measure the gas extracted by the sampling pump and analyze the oxygen content;

The oxygen measuring solenoid valve control module is used to open or close the valve when sampling and pumping air.

Compared with the existing technology, the present invention has the following advantages and technical effects:

(1) This system gets rid of the traditional air intake control method of using glass rotor flowmeter and manual valve. It adopts three sets of mass flow controllers with different ranges, combined with the dynamic gas distribution method oxygen balance partial pressure calculation method, at different oxygen contents. Automatically adjust the gas distribution volume of N ₂ and O ₂ within the range, automatically control the gas flow, and the mixed gas enters the furnace through multiple pores, effectively ensuring a uniform atmosphere at each position in the furnace; at the same time, precise flow control can ensure that the oxygen content in the furnace is kept constant. Stable, reducing the impact of artificially controlled flow fluctuations on the atmosphere in the furnace.

(2) This system has excellent formula management and data management functions. It can set multiple sintering processes from the human-machine interface, and any sintering process can be downloaded to the PLC controller at any time. After the process setting is completed, the process can be calibrated. Check whether the curve is correct. At the same time, various parameters of this production, such as pressure, temperature, flow, oxygen content, duration, etc., can be recorded in real time. All data are recorded in external storage devices and saved when powered off, effectively protecting historical sintering data. Safety.

(3) This system has an advanced safety control mechanism and a pressure balance protection function. When an overpressure alarm occurs in the furnace, it will automatically open all exhaust valves and close all inlet valves to ensure the safety of the furnace. When a low-pressure alarm occurs in the internal pressure, the air inlet valve opens to the second set pressure and an audible and visual alarm is issued to ensure positive pressure in the furnace to prevent product oxidation; it is equipped with an over-temperature and low-temperature protection function. When the temperature measurement element is abnormal, the real-time temperature When the display is too low, the system will limit the heating start and give an alarm. When the real-time temperature exceeds the high limit, the system will cut off all heating output to prevent the furnace from melting; it is equipped with a flow protection function. When the real-time flow rate and the set flow rate are inconsistent for a long time, Cut off the flow output to prevent the quality controller from burning out.

Description of drawings

The drawings that form a part of this application are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an improper limitation of this application. In the attached picture:

Figure 1 is an overall framework diagram of an embodiment of the present invention;

Figure 2 is a control process flow chart of the embodiment of the present invention;

Figure 3 is a schematic diagram of the composition of a PLC controller according to an embodiment of the present invention.

Reference symbols: 1. PLC controller; 2. Heating system; 3. Temperature control system; 4. Cooling system; 5. Gas distribution system; 6. Pressure system; 7. Oxygen measuring system; 8. Host computer; 11. Acquisition module; 12. Communication module; 13. Processing module; 14. Execution module; 21. Heating element; 22. Constant current voltage regulation module; 31. Temperature control module; 32. Temperature measuring element; 41. Water pressure detection module; 42. Water flow detection module; 43. Pneumatic valve control module; 51. Gas flow module; 52. Air pressure detection module; 53. Gas distribution solenoid valve control module; 61. Local pressure detection module; 62. Remote pressure detection module; 63 , Valve-controlled exhaust module; 71. Sampling pump; 72. Oxygen meter; 73. Oxygen measuring solenoid valve-controlled module.

Detailed ways

It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is customarily placed when used. It is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply. The devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limitations of the invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions and shall not be understood as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," "overhanging," etc. do not imply a requirement that the component be absolutely horizontal or overhanging, but may be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical". It does not mean that the structure must be completely horizontal, but can be slightly tilted.

In the description of the present invention, it should also be noted that, unless otherwise clearly stated and limited, the terms "set", "installation", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, unless otherwise expressly provided and limited, the term "above" or "below" a first feature of a second feature may include direct contact between the first and second features, or may also include the first and second features. Not in direct contact but through additional characteristic contact between them. Furthermore, the terms "above", "above" and "above" a first feature on a second feature include the first feature being directly above and diagonally above the second feature, or simply mean that the first feature is higher in level than the second feature. “Below”, “under” and “under” the first feature is the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature is less horizontally than the second feature.

Embodiment 1

As shown in Figures 1-3, this embodiment provides an automatic gas distribution and temperature rising sintering control device for soft ferrite, which is suitable for the field of PLC control technology. An automatic gas distribution and temperature rising control device for soft ferrite is provided, including PLC controller 1. The PLC controller 1 is electrically connected to a heating system 2, a temperature control system 3, a cooling system 4, a gas distribution system 5, a pressure system 6, an oxygen measurement system 7 and a host computer 8.

In this implementation, the user turns on the computer and clicks on the host computer software on the desktop. The software automatically loads the current system status, sets the process curve in the process setting interface and downloads it to the PLC controller 1. After clicking to start, the PLC controller 1 The temperature control module 31 is controlled to output a current signal to the heating system 2. The constant current voltage regulation module 22 automatically adjusts the voltage output according to the size of the current signal, and controls the heating element 21 to heat up. When the actual temperature reaches the cooling water opening temperature, the cooling system 4 starts running. , when this section of the process requires atmosphere control, the gas distribution system 5 starts to operate, automatically calculates the flow ratio according to the set target value, the gas distribution solenoid valve control module 53 opens, and the gas mass flow controller automatically outputs the set flow value, standard The gas and dilution gas are transported to the gas mixing box, and the mixed gas is transported to the furnace body, and the pressure gradually increases. When the remote pressure detection module 62 detects that the pressure in the furnace is too high, the valve-controlled exhaust module 63 automatically exhausts the gas. Restore the pressure in the furnace to the normal range. The oxygen measuring system 7 detects the atmosphere in the furnace in real time and feeds back the data to the PLC controller 1. According to the feedback data, the PLC controller 1 outputs a control signal to the gas distribution system 5. The system automatically calculates and regulates the output flow rate and has reached the set value, and the temperature rise program is run. After reaching the last paragraph, the program ends and the entire process ends.

Further, the PLC controller 1 includes a collection module 11, a communication module 12, a processing module 13, and an execution module 14. The input terminal of the collection module 11 is a gas flow module 51, an air pressure detection module 52, a water pressure detection module 41, and a water flow detection module. Module 42 and other output terminals are connected for collection and conversion of analog signals. The processing module 13 is electrically connected to a collection module 11, a communication module 12, and an execution module 14 for controlling and processing the data behavior of all modules. The communication module 12 is used to read and write data to the temperature control module 31 and the oxygen meter 72 , and the execution module 14 is used to execute the control command issued by the processing module 13 .

In this implementation, the PLC controller 1 is set as Delta's DVPSV2 system, equipped with a programmed temperature-raising software system, a gas distribution control software system, an alarm prompt recording software system, and a data acquisition software system. Among them, the programmed temperature-raising software system: the software interface can be set Fixed PID temperature control parameters, 32-segment heating program, each segment can set the target temperature and heating time independently, and 6 types of process curves can be set. The user can retrieve a process curve at any time and download it to the processing module 13. The process curve can be set Password must be set, and non-administrator accounts cannot modify or view it. Gas distribution control software system: The software interface can set 32 segments of gas distribution programs. Each segment can independently set the target oxygen content, total flow rate, and open epoxy coefficient. The communication module 12 can read the real-time measurement value of the oxygen meter 72 and Feedback to PLC controller 1. Alarm prompt recording software system: The software interface can record and display current alarms, historical alarms, alarm times, alarm time, and alarm information in real time. The current alarm status can be prompted with sound and light through the execution module 14, and the current alarm status can be automatically reset manually. Data acquisition software system: The software interface has real-time oxygen content, real-time temperature, target oxygen content, target temperature, _N2 flow, _O2 flow and other parameter recording functions. It can automatically record the current real-time data according to the trigger parameters set in the processing module 13. Data is recorded and an EXCEL table is generated. Users can query the process status of this sintering batch at any time through historical data records.

Further, the heating system 2 includes heating elements 21. The heating elements 21 are connected together through multiple series and angular connections. The three-phase power regulator in the constant current voltage regulation module 22 receives the signal from the temperature control module 31 and automatically adjusts. The heating element 21 is controlled to heat up.

In this embodiment, multiple heating elements 21 are connected in series and in an angular connection. When one phase of the load is disconnected, the other two phases can still operate normally. The temperature control module 31 automatically calculates the output amount based on the real-time temperature fed back by the temperature measuring element 32, and outputs the signal to the constant current voltage regulation module 22. The three-phase power regulator automatically adjusts the voltage output to the heating element 21. When it detects that the current is greater than When the maximum current limit is reached, the current output is automatically reduced to ensure normal temperature rise in the furnace.

Further, the cooling system 4 includes a water pressure detection module 41, a water flow detection module 42, a pneumatic valve control module 43. When the temperature in the furnace reaches the set opening temperature of the cooling water, the pneumatic valve control module 43 opens, and the cooling circulating water enters the furnace cooling plate. Tube.

In this embodiment, the water pressure detection module 41 can detect the incoming water pressure. If the pressure is too high, the incoming water will be cut off through the pneumatic valve control module 43 and an abnormal alarm of excessive water pressure will be generated. After the pneumatic valve control module 43 is normally opened, the water flow will The detection module 42 determines whether the flow is interrupted through the target flow controller. When the target blade detects that water is flowing through, the PLC controller 1 detects the flow interruption signal, outputs an abnormal flow interruption alarm, and prompts the operator with sound and light.

Further, the gas distribution system 5 includes a gas flow module 51, a pressure detection module 52, a gas distribution solenoid valve control module 53, and the PLC controller 1 controls the two gas mass flow controllers to output different flow rates, and the two flow rates are mixed through dilution. Gas enters the furnace.

In this embodiment, the air pressure detection module 52 can detect in real time whether the incoming air pressure is 0.2Mpa. When the pressure is too high or too low, an abnormal alarm is generated and fed back to the processing module 13. After the air distribution process is started, the air distribution solenoid valve controls Module 53 controls the opening of the valve, and the N ₂ and O ₂ mass flow controllers output different flows to the gas mixing box respectively. The mixed gas is transported to the sintering furnace through the valve, and the current atmosphere is adjusted to the target value.

Further, the pressure system 6 includes a local pressure detection module 61, a remote pressure detection module 62 and a valve-controlled exhaust module 63. The maximum pressure and alarm pressure can be set in the PLC controller 1 according to the current fed back by the remote pressure detection module 62. signal, automatically adjusting the air inlet and outlet to ensure that the pressure in the furnace is normal and controllable.

In this embodiment, the local pressure detection module 61 is a mechanical pressure gauge, used in conjunction with a pressure valve. When overpressure is detected, the pressure valve opens to exhaust, and the remote pressure detection module 62 is a digital pressure gauge, which converts the pressure into The current signal is transmitted to the acquisition module 11. When the pressure in the furnace is too high, the valve-controlled exhaust module 63 automatically opens and closes automatically when the pressure is normal. When the pressure in the furnace is detected to be too high or too low, a furnace pressure will be generated. Abnormal alarm.

Further, the oxygen measurement system 7 includes an oxygen meter 72 and an oxygen measurement solenoid valve control module 73, which can measure the O ₂ content in the furnace in real time through the sampling pump 71 and feed the data back to the PLC controller 1.

In this embodiment, the oxygen meter 72 is a zirconia analyzer, which can automatically detect the oxygen content in the range of 21%-0.1ppm in stages. After the oxygen measuring valve on the oxygen measuring solenoid valve control module 73 is opened, the furnace is The pressure enters the zirconia analyzer through the sampling pump 71, and the communication module 12 reads the analyzer value.

The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. All are covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims (8)

1. The utility model provides a soft magnetic ferrite automatic gas distribution intensification sintering controlling means which characterized in that includes: the system comprises a PLC (programmable logic controller) controller (1), a heating system (2), a temperature control system (3), a cooling system (4), a gas distribution system (5), a pressure system (6), an oxygen measuring system (7) and an upper computer (8), wherein the heating system (2), the temperature control system (3), the cooling system (4), the gas distribution system (5), the pressure system (6) and the oxygen measuring system (7) are electrically connected with the PLC controller (1);

the PLC (1) is used for collecting information fed back by other systems and controlling the other systems based on the fed back information;

the heating system (2) is used for heating the temperature in the sintering furnace;

the temperature control system (3) is electrically connected with the heating system (2), and the temperature control system (3) is used for collecting real-time temperature, setting the temperature in the furnace and controlling the heating system (2) to heat the temperature in the furnace;

the cooling system (4) is used for conveying cooling water to a cooling circulation part of the sintering furnace for cooling after the temperature measuring element (32) detects that the temperature in the furnace reaches the set starting temperature of the cooling water, and the cooling water is turned off when the temperature in the furnace is reduced to below 200 ℃.

The gas distribution system (5) is used for carrying out proportional gas distribution and mixing on different gases and conveying the mixed gases into the furnace;

the pressure system (6) is used for detecting the pressure in the furnace in real time, and opening or stopping pressure relief based on the actual pressure condition;

the oxygen measuring system (7) is used for measuring the real-time value of the oxygen content in the furnace by the oxygen measuring system (7) and feeding back the oxygen content to the PLC (1);

the upper computer (8) is used for man-machine interaction and control.

2. The device according to claim 1, wherein the PLC controller (1) comprises an acquisition module (11), a communication module (12), a processing module (13), an execution module (14);

the acquisition module (11) is used for acquiring a plurality of types of in-furnace information, and performing analog-to-digital conversion on the acquired in-furnace information to obtain digital signals, wherein the in-furnace information comprises gas flow information, air pressure information, water pressure information and water flow information;

the communication module (12) is used for reading write-in data to the constant-current voltage regulation module (22), the temperature control module (31) and the oxygen meter (72) in a Modbus RTU and TCP communication mode;

the processing module (13) is used for calculating and processing the digital signals obtained by the acquisition module (11) to obtain control instructions;

the execution module (14) is used for receiving a control instruction sent by the PLC (1) and outputting a switching value or analog quantity signal to the electromagnetic valve, the pneumatic valve and the three-phase power regulator.

3. The device according to claim 2, characterized in that the temperature control system (3) comprises a temperature control module (31), a temperature measuring element (32); wherein,

the temperature measuring element (32) is used for collecting a thermal electromotive force signal and feeding the thermal electromotive force signal back to the temperature control module (31);

the temperature control module (31) is used for receiving the thermal electromotive force signal, acquiring a heating signal, transmitting the heating signal to the heating system (2), and controlling the temperature based on a control instruction of the PLC (1).

4. A device according to claim 3, characterized in that the heating system (2) comprises several heating elements (21) and a constant-current voltage regulation module (22); wherein,

a plurality of heating elements (21) are connected together in a serial connection and angular connection mode;

the constant-current voltage regulation module (22) is used for receiving a temperature rising signal of the temperature control module (31), and controlling the heating elements (21) to heat based on the temperature rising signal.

5. The device according to claim 1, characterized in that the cooling system (4) comprises a water pressure detection module (41), a water flow detection module (42), a pneumatic valve control module (43); wherein,

the water pressure detection module (41) is used for detecting the water pressure of the incoming water in real time, and if the water pressure of the incoming water is greater than or equal to a preset first water pressure critical value, a water pressure too high signal is generated and transmitted to the PLC (1);

the water flow detection module (42) is used for detecting the water flow in real time, and if the water flow is smaller than or equal to a preset first flow critical value, a cut-off signal is generated and transmitted to the PLC (1);

the pneumatic valve control module (43) is used for switching on or switching off the cooling circulating water based on the control instruction of the PLC (1).

6. The device according to claim 1, characterized in that the gas distribution system (5) comprises a gas flow module (51), a gas pressure detection module (52), a gas distribution solenoid valve control module (53); wherein,

the gas flow module (51) adopts a gas mass flow controller to control the flow of N2 or O2 introduced into the furnace, and feeds back a real-time flow value and an abnormal signal to the PLC (1);

the air pressure detection module (52) is used for detecting whether the incoming air pressure is a first preset air pressure value in real time, if so, normally conveying air, and if not, generating an abnormal alarm and feeding back to the PLC (1);

the valve control module (53) is used for opening the valve after the valve flow is opened.

7. The apparatus of claim 1, wherein the pressure system (6) comprises a local pressure detection module (61), a remote pressure detection module (62) and a valve-controlled venting module (63); wherein,

the local pressure detection module (61) is used for detecting the pressure in the furnace in real time on site, when the local pressure is greater than or equal to a first pressure set value, the pressure relief valve is opened, and when the local pressure is smaller than the first pressure set value, the pressure relief valve is closed;

the remote pressure detection module (62) is used for detecting the pressure in the furnace in a real-time remote mode, generating an exhaust signal and transmitting the exhaust signal to the PLC (1) if the remote pressure is greater than or equal to a preset second pressure value, and generating a valve closing signal and transmitting the valve closing signal to the PLC (1) if the remote pressure is less than the preset second pressure value;

the valve control exhaust module (63) is used for receiving a control instruction of the PLC (1) and performing pressure relief or stopping pressure relief according to a signal fed back by the remote pressure detection module (62).

8. The device according to claim 1, characterized in that the oxygen measuring system (7) comprises a sampling pump (71), an oxygen meter (72) and an oxygen measuring solenoid valve control module (73); wherein,

-the sampling pump (71) is used for extracting gas;

the oxygen meter (72) is used for measuring the gas extracted by the sampling pump (71) and analyzing the oxygen content;

the oxygen measurement electromagnetic valve control module (73) is used for opening or closing a valve when sampling and exhausting.