Safety control system for heat treatment furnace, and heat treatment furnace

Abstract

A safety control system for a heat treatment furnace, and a heat treatment furnace. The safety control system for a heat treatment furnace is applied to a heat treatment furnace, wherein the heat treatment furnace comprises a treatment furnace body (10). The safety control system for a heat treatment furnace comprises an oxygen content monitoring member (81), an atmosphere module (82), a nitrogen module (83) and a control module (7), wherein the oxygen content monitoring member (81) is configured to monitor the oxygen content inside the treatment furnace body (10); the atmosphere module (82) is configured to output a reducing gas into the treatment furnace body (10) or cut off the output thereof; the nitrogen module (83) is configured to output nitrogen into the treatment furnace body (10) or cut off the output thereof; and the control module (7) is configured to acquire the oxygen content in real time and acquire the operating state of the treatment furnace body (10) in real time, and control the atmosphere module (82) and the nitrogen module (83) on the basis of the oxygen content and the operating state, so as to output the nitrogen into the treatment furnace body (10) or cut off the output thereof.

Description

Safety control system of heat treatment furnace and heat treatment furnace

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 21, 2023 with application number 202311221812.4, and the Chinese patent application filed with the China Patent Office on September 21, 2023 with application number 202322567105.2, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of heat treatment of steel pipes, for example, to a safety control system of a heat treatment furnace and a heat treatment furnace. Background Art

[0003] Carbon steel and alloy steel pipes with zero decarburization and a bright surface are primarily used in the automotive and aviation sectors. For example, they are used in automobile steering shafts, where strict requirements for the thickness and brightness of the decarburized layer are imposed. When used as automobile steering shafts, steel pipes experience metal fatigue from the thousands of twisting movements during driving. Decarburization shortens the product's fatigue life, and surface decarburization is highly susceptible to failure and serious accidents, making it unacceptable.

[0004] In the production process of steel pipes, whether it is "normalizing heat treatment" or "annealing heat treatment", it is a "heating-cooling" process. The production equipment includes a heating section, a rapid cooling section and a slow cooling section. During the normalizing process, heating and heat preservation are achieved in the heating section, rapid cooling is achieved in the rapid cooling section, and final cooling is achieved in the slow cooling section.

[0005] In related technologies, to achieve a bright surface of steel pipes, pickling is usually performed after the normalizing process to remove the oxide layer on the surface of the steel pipes. However, the pickling process seriously pollutes the environment, and wastewater treatment and discharge are a major problem.

[0006] Decarburization primarily refers to the phenomenon during the heat treatment of stainless steel pipes where carbon atoms on the pipe's surface gain enough energy to escape from the pipe's surface into the heat treatment furnace, passively reducing the material's carbon content. The result is low and uneven hardness. Decarburization occurs when carbon atoms react with the oxidizing atmosphere, causing the surface to become decarbonized. Decarburization is a diffusion process where oxygen from the furnace gas diffuses into the steel while carbon from the steel diffuses outward. This diffusion creates a low-carbon decarburized layer on the steel's surface.

[0007] Summary of the Invention

[0008] The present application provides a safety control system for a heat treatment furnace and a heat treatment furnace to solve the problem of how to effectively control the oxygen content in the heat treatment furnace during heat treatment to achieve safe production.

[0009] An embodiment of the present application provides a safety control system for a heat treatment furnace, which is applied to a heat treatment furnace, wherein the heat treatment furnace includes a treatment furnace main body, and the safety control system of the heat treatment furnace includes an oxygen content monitoring component, an atmosphere module, a nitrogen module and a control module; the oxygen content monitoring component is configured to monitor the oxygen content inside the treatment furnace main body; the atmosphere module is configured to output or cut off the output of reducing gas to the interior of the treatment furnace main body; the nitrogen module is configured to output or cut off the output of nitrogen to the interior of the treatment furnace main body; the reducing gas and the nitrogen constitute the generated atmosphere inside the treatment furnace main body; the input end of the control module is electrically connected to the oxygen content monitoring component, and the output end of the control module is electrically connected to the atmosphere module and the nitrogen module respectively; the control module is configured to obtain the oxygen content and the working status of the treatment furnace main body in real time, and control the atmosphere module and the nitrogen module based on the oxygen content and the working status, so that the reducing gas is output or cut off from being output to the interior of the treatment furnace main body, and the nitrogen is output or cut off from being output to the interior of the treatment furnace main body.

[0010] An embodiment of the present application provides a heat treatment furnace, which includes a treatment furnace body and the safety control system of the heat treatment furnace described in any embodiment of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0012] FIG1 is a schematic diagram of a portion of the structure of a heat treatment furnace used in a safety control system for a heat treatment furnace provided in Example 1 of the present application;

[0013] FIG2 is a circuit block diagram of a safety control system for a heat treatment furnace provided in Example 1 of the present application;

[0014] 3 is a circuit block diagram of another safety control system for a heat treatment furnace provided according to Example 1 of the present application;

[0015] FIG4 is a schematic diagram of a partial structure of a connection between a ventilation section and a heating section provided in Example 1 of the present application;

[0016] FIG5 is a schematic diagram of a portion of the structure of a heat treatment furnace equipped with a fire curtain device, which is applied to a safety control system for a heat treatment furnace provided in Example 1 of the present application;

[0017] FIG6 is a schematic diagram of a partial structure of a heat treatment furnace protruding flame curtain device applied to a safety control system of a heat treatment furnace provided in Example 1 of the present application;

[0018] FIG7 is a cross-sectional view of a heat insulation section and two fast cooling chambers provided in Example 1 of the present application;

[0019] FIG8 is a front cross-sectional view of a fast cooling chamber provided in Example 1 of the present application;

[0020] FIG9 is a side sectional view of a fast cooling chamber provided in Example 1 of the present application. DETAILED DESCRIPTION

[0021] The following will describe the technical solutions in the embodiments of this application in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] Example 1

[0024] FIG1 is a schematic diagram of a portion of the structure of a heat treatment furnace used in a safety control system for a heat treatment furnace provided in Example 1 of the present application, and FIG2 is a circuit block diagram of a safety control system for a heat treatment furnace provided in Example 1 of the present application. As shown in FIG1 and FIG2, the safety control system for the heat treatment furnace is applied to the heat treatment furnace. In this embodiment, the heat treatment furnace is configured to perform heat treatment on steel pipes, such as normalizing and annealing. The heat treatment furnace includes a treatment furnace body 10. The safety control system for the heat treatment furnace includes an oxygen content monitoring component 81, an atmosphere module 82, a nitrogen module 83, and a control module 7. The treatment furnace body 10 refers to the main part of the heat treatment furnace. Optionally, according to the movement direction of the steel pipe, the heat treatment furnace includes a loading section, a treatment furnace body 10, and a discharging section. The treatment furnace body 10 includes four areas, namely, a ventilation section, a heating section 300, a rapid cooling section 500, and a slow cooling section 600, so as to achieve heat treatment of the steel pipe.

[0025] The oxygen content monitoring component 81 is configured to monitor the oxygen content inside the treatment furnace body 10. One or more oxygen content monitoring components 81 are disposed inside the treatment furnace body 10, and the key monitoring position is the furnace cavity near the feed port and the discharge port. Oxygen content refers to the proportion of oxygen in the gas inside the treatment furnace body 10. The oxygen content monitoring component 81 refers to a component capable of monitoring the oxygen content. The oxygen content monitoring component 81 can be disposed inside the treatment furnace body 10, thereby monitoring the oxygen content inside the treatment furnace body 10. Optionally, the oxygen content monitoring component 81 includes a Lambda probe detector. The Lambda probe detector is an oxygen measuring probe that can measure the proportion of oxygen components in a mixed gas, thereby accurately monitoring the oxygen content inside the treatment furnace body 10. In addition, the oxygen content monitoring component 81 may also include an oxygen sensor or an oxygen content detector, which is not limited here.

[0026] The atmosphere module 82 is configured to output or cut off the output of reducing gas to the inside of the treatment furnace main body 10. The atmosphere module 82 refers to a module that stores reducing gas and can output or cut off the output of reducing gas. The nitrogen module 83 is configured to output or cut off the output of nitrogen to the inside of the treatment furnace main body 10. The nitrogen module 83 refers to a module that stores nitrogen and can output or cut off the output of nitrogen. When nitrogen is output to the inside of the treatment furnace main body 10, it can discharge oxygen out of the furnace, reduce the oxygen content in the furnace, and can also discharge flammable reducing gas out of the furnace, eliminating safety hazards. Reducing gas and nitrogen constitute the generating atmosphere inside the treatment furnace main body 10. The generating atmosphere refers to the atmosphere that can prevent the steel pipe from oxidizing, decarburizing and blackening and make it bright when the steel pipe is heat treated inside the treatment furnace main body 10. The reducing gas can be one or more of carbon monoxide, hydrocarbon combustible gas and hydrogen.

[0027] Optionally, the atmosphere module 82 includes a first gas storage assembly, a first delivery pipe, and a first control valve. The first gas storage assembly is configured to store reducing gas. The first delivery pipe connects the first gas storage assembly and the processing furnace body 10. Multiple gases are stored separately by multiple first gas storage assemblies, delivered, and collected in the first delivery pipe. The first control valve is configured to control the conduction and closing of the first delivery pipe, so that when the first control valve is opened to conduct the first delivery pipe, the reducing gas can be output to the interior of the processing furnace body 10. When the first control valve is closed to close the first delivery pipe, the output of reducing gas to the interior of the processing furnace body 10 will be cut off. Therefore, the output of reducing gas to the interior of the processing furnace body 10 can be controlled or cut off by simply controlling the state of the first control valve. The first control valve is a solenoid valve.

[0028] The input end of the control module 7 is electrically connected to the oxygen content monitoring component 81, and the output end of the control module 7 is electrically connected to the atmosphere module 82 and the nitrogen module 83 respectively. The control module 7 is configured to obtain the oxygen content in real time and the working status of the processing furnace main body 10 in real time, and control the atmosphere module 82 and the nitrogen module 83 based on the oxygen content and the working status to output or cut off the reducing gas to the inside of the processing furnace main body 10, and output or cut off the nitrogen to the inside of the processing furnace main body 10.

[0029] The control module 7 refers to a module that can be programmed to execute instructions for operations such as logical operations, sequential control, timing, counting, and arithmetic operations. Optionally, the control module 7 can be a microcontroller unit (MCU), a programmable logic controller (PLC), a digital signal processing (DSP) chip, or a field programmable gate array (FPGA). The working states of the treatment furnace body 10 include furnace start, production, and furnace shutdown. When the heat treatment furnace performs heat treatment on the steel pipe, it is usually necessary to heat the steel pipe. Therefore, the temperature inside the heat treatment furnace needs to reach a specified temperature during the production process. Furnace start refers to the process of raising the temperature inside the treatment furnace body 10 to the specified temperature; production refers to the process of the steel pipe to be heat treated entering the treatment furnace body 10 for heat treatment. Furnace shutdown refers to the process of cooling the temperature inside the treatment furnace body 10 to room temperature after the production is completed. In this embodiment, heat treatment refers to normalizing or annealing. Since the control module 7 can control the atmosphere module 82 and the nitrogen module 83 according to the oxygen content and working status, it can effectively control the atmosphere and oxygen content inside the processing furnace body 10, reduce decarbonization caused by oxygen, and prevent the furnace from exploding due to excessive oxygen.

[0030] The above scheme monitors the oxygen content inside the treatment furnace main body 10 by setting an oxygen content monitoring component 81, and then obtains the oxygen content in real time through the control module 7, and obtains the working status of the treatment furnace main body 10 in real time; based on the oxygen content and working status, the atmosphere module 82 and the nitrogen module 83 are controlled to output or cut off the reducing gas to the inside of the treatment furnace main body 10, and to output or cut off the nitrogen to the inside of the treatment furnace main body 10, so as to effectively control the generation atmosphere and oxygen content inside the treatment furnace main body 10, reduce the decarburization caused by oxygen, and prevent the furnace from exploding due to excessive oxygen, and solve the problem of how to effectively control the oxygen content in the heat treatment furnace during heat treatment to achieve safe production. At the same time, a steel pipe product with a bright surface and no new decarburization layer can be obtained, without the need for pickling, which is environmentally friendly.

[0031] In an optional embodiment of the present application, as shown in Figures 1 and 3, the nitrogen module 83 includes a process nitrogen sub-module 831, which is configured to output or cut off the output of process nitrogen to the interior of the processing furnace main body 10. The process nitrogen, as one of the components of the generating atmosphere, is controlled separately from the reducing gas; the control module 7 is configured to: when the working state of the processing furnace main body 10 is to open the furnace, determine whether the oxygen content is higher than the preset oxygen content threshold value; if the oxygen content is higher than the preset oxygen content threshold value, control the process nitrogen sub-module 831 to output process nitrogen to the interior of the processing furnace main body 10, and when the oxygen content is less than or equal to the preset oxygen content threshold value, control the atmosphere module 82 to output the reducing gas to the interior of the processing furnace main body 10. At this time, the flow rate of the process nitrogen can be adjusted according to the proportional relationship between the components of the generating atmosphere.

[0032] The process nitrogen submodule 831 refers to a module that stores process nitrogen and can output or cut off the output of process nitrogen. The main component of process nitrogen is nitrogen, which is used to maintain the inert atmosphere in the treatment furnace required for the production process. Optionally, the process nitrogen submodule 831 includes a second gas storage assembly, a second delivery pipeline and a second control valve, the second gas storage assembly is configured to store process nitrogen, the second delivery pipeline connects the second gas storage assembly and the treatment furnace body 10, and the second control valve is configured to control the conduction and closing of the second delivery pipeline, so that when the second control valve is opened to conduct the second delivery pipeline, the process nitrogen can be output to the inside of the treatment furnace body 10, and when the second control valve is closed to close the second delivery pipeline, the output of process nitrogen to the inside of the treatment furnace body 10 will be cut off, so that the output or cut-off of the output of process nitrogen to the inside of the treatment furnace body 10 can be controlled by simply controlling the state of the second control valve. The second control valve is a solenoid valve.

[0033] The preset oxygen threshold value refers to the upper limit of the oxygen content within the treatment furnace body 10 that meets safety standards. When the treatment furnace body 10 is in the open state, if the oxygen content exceeds the preset oxygen threshold value, it indicates that the oxygen content is too high. If reducing gas is introduced at this time, there is a safety hazard of furnace explosion. In this case, the process nitrogen submodule 831 is controlled to output process nitrogen into the treatment furnace body 10. The input of process nitrogen can reduce the oxygen content in the treatment furnace body 10 and create an inert atmosphere. In addition, by allowing the atmosphere module 82 to output reducing gas into the treatment furnace body 10 only when the oxygen content is less than or equal to the preset oxygen threshold value, the reduction gas can be prevented from causing an explosion when the oxygen content is too high.

[0034] The preset oxygen threshold value is determined based on the composition and proportion of the reducing gas and must comply with safety standards. Optionally, the preset oxygen threshold value is any value between 0.5% and 1.5%. The preset oxygen threshold value is any value between 0.8% and 1.2%, and the preset oxygen threshold value is any value between 0.9%, 0.95%, 1%, and 1.05%.

[0035] In an optional embodiment of the present application, the nitrogen module 83 includes a safety nitrogen sub-module 832, which is configured to output or cut off the output of safety nitrogen to the interior of the treatment furnace main body 10; the control module 7 is configured to: when the working state of the treatment furnace main body 10 is production, determine whether the oxygen content is higher than the preset oxygen content threshold value, if the oxygen content is higher than the preset oxygen content threshold value, control the atmosphere module 82 to cut off the output of reducing gas to the interior of the treatment furnace main body 10, and control the safety nitrogen sub-module 832 to output safety nitrogen to the interior of the treatment furnace main body 10 until the output is cut off when the oxygen content is less than or equal to the preset oxygen content threshold value, and when the oxygen content is less than or equal to the preset oxygen content threshold value, control the atmosphere module 82 to output reducing gas to the interior of the treatment furnace main body 10 so that the heat treatment furnace continues production.

[0036] The safety nitrogen submodule 832 refers to a module that stores safety nitrogen and can output or cut off the output of safety nitrogen. Safety nitrogen and process nitrogen are both nitrogen, but have different uses. Safety nitrogen is used to provide a large amount of nitrogen in an emergency to maintain the inert atmosphere of the heat treatment furnace and ensure the safe operation of the heat treatment furnace. Optionally, the safety nitrogen submodule 832 includes a third gas storage assembly, a third delivery pipeline and a third control valve. The third gas storage assembly is configured to store safety nitrogen. The third delivery pipeline connects the third gas storage assembly and the treatment furnace body 10. The third control valve is configured to control the conduction and closing of the third delivery pipeline, so that when the third control valve is opened to conduct the third delivery pipeline, the safety nitrogen can be output to the inside of the treatment furnace body 10. When the third control valve is closed to close the third delivery pipeline, the output of safety nitrogen to the inside of the treatment furnace body 10 will be cut off. Therefore, it is only necessary to control the state of the third control valve to control the output or cut off of the output of safety nitrogen to the inside of the treatment furnace body 10. The third control valve is a solenoid valve. In this embodiment, the third control valve includes three types: a normally open solenoid valve, a normally closed solenoid valve, and a manual valve; when an equipment abnormality triggers the safety interlock control, safety nitrogen is introduced through the normally closed solenoid valve; in the event of a power outage, safety nitrogen is introduced through the normally open solenoid valve; in special circumstances, safety nitrogen is manually introduced through the manual valve; the combustible reducing gas in the furnace is discharged from the smoke exhaust port to avoid the furnace being filled with combustible gas after a sudden shutdown, which poses a risk of furnace explosion.

[0037] When the processing furnace body 10 is in the production state, if the oxygen content exceeds a preset oxygen threshold, it indicates that the oxygen content is too high and there is a safety hazard of furnace explosion. At this time, the atmosphere control module 82 cuts off the output of reducing gas to the interior of the processing furnace body 10, which can prevent the processing furnace body 10 from producing under safety risks. By controlling the safety nitrogen submodule 832 to output safety nitrogen to the interior of the processing furnace body 10, the input of safety nitrogen can reduce the oxygen content, thereby preventing the furnace explosion caused by excessive oxygen content. Since the output of reducing gas is cut off when the safety nitrogen is input, the oxygen content can be quickly reduced to less than or equal to the preset oxygen threshold, thus quickly resolving the safety hazard in production. By allowing the atmosphere module 82 to output reducing gas to the interior of the processing furnace body 10 only when the oxygen content is less than or equal to the preset oxygen threshold, so that the processing furnace body 10 can continue production, it can prevent the processing furnace body 10 from producing under safety risks and also prevent the occurrence of poor surface quality of the produced steel pipes due to excessive oxygen content.

[0038] In an optional embodiment of the present application, as shown in Figures 1 and 3, the safety control system of the heat treatment furnace also includes a combustible gas monitoring component 84, which is configured to monitor the combustible gas content inside the treatment furnace main body 10, and the nitrogen module 83 includes a safety nitrogen sub-module 832, which is configured to output or cut off the output of safety nitrogen to the inside of the treatment furnace main body 10; the control module 7 is configured to: when the working state of the treatment furnace main body 10 is shutdown, turn off the heating device, control the atmosphere module 82 to cut off the output of reducing gas to the inside of the treatment furnace main body 10, control the safety nitrogen sub-module 832 to output safety nitrogen to the inside of the treatment furnace main body 10, and obtain the combustible gas content, determine whether the oxygen content is higher than the preset oxygen content threshold and whether the combustible gas content is less than the preset combustible gas content threshold, and control the treatment furnace main body 10 to start cooling when the oxygen content is less than or equal to the preset oxygen content threshold and the combustible gas content is less than or equal to the preset combustible gas content threshold. When the furnace is shut down, the combustible gas content is usually obtained by obtaining the combustible gas content of the slow cooling section 600, especially the combustible gas content at the position closest to the discharge port in the slow cooling section 600. The furnace body of the slow cooling section 600 is relatively long. When the combustible gas content at the discharge port drops below the preset combustible gas content threshold, it can basically ensure that the combustible gas content at other positions in the furnace also meets the requirements.

[0039] Furthermore, furnace shutdowns include normal and emergency shutdowns. During a normal shutdown, the feeding of new batches of steel pipes is stopped, and the furnace door is closed after the current batch of steel pipes has completed heat treatment and exited the furnace. During an emergency shutdown, sensors installed on the furnace door confirm that there are no steel pipes occupying the furnace door, and the door is then closed. Closing the furnace door reduces the ingress of oxygen into the treatment furnace body 10, preventing safety accidents.

[0040] The safety nitrogen submodule 832 stores safety nitrogen and is capable of outputting or shutting off the safety nitrogen output. The combustible gas content refers to the percentage of combustible gas within the treatment furnace body 10. The combustible gas monitoring component 84 is a component capable of monitoring the combustible gas content. Optionally, the combustible gas monitoring component 84 can be a gas analyzer. The preset combustible gas content threshold is the upper limit of the combustible gas content that can avoid safety risks. In addition, the reducing gas in the generating atmosphere usually includes combustible gas. When the working state of the processing furnace main body 10 is shutdown, the processing furnace main body 10 needs to be cooled to room temperature. The atmosphere module 82 is first controlled to cut off the output of the reducing gas to the inside of the processing furnace main body 10, cutting off the source of the combustible gas. At this time, the process nitrogen sub-module 831 needs to be controlled to continuously output process nitrogen; then the safety nitrogen sub-module 832 is controlled to output safety nitrogen to the inside of the processing furnace main body 10, which can reduce the oxygen content and combustible gas content inside the processing furnace main body 10. When the oxygen content is less than or equal to the preset oxygen content threshold and the combustible gas content is less than or equal to the preset combustible gas content threshold, the processing furnace main body 10 can be controlled to start cooling and the output of safety nitrogen can be cut off, which can prevent the temperature change from causing the explosion conditions to change and cause the furnace to explode, thereby improving the safety of production; the output of process nitrogen can be cut off only after the temperature of the processing furnace main body 10 drops to room temperature.

[0041] In an optional embodiment of the present application, the reducing gas includes carbon monoxide, hydrogen, and hydrocarbon combustible gases, which can prevent the steel pipe from oxidizing and blackening. Hydrocarbon combustible gases such as alkanes, alkenes, and alkynes can react incompletely with the oxygen inside the treatment furnace body 10 at high temperatures, consuming oxygen and preventing furnace explosion.

[0042] Reducing gas is suitable for continuous normalizing and annealing heat treatment production of various low carbon steel, medium carbon steel, low alloy carbon steel, and medium carbon alloy steel steel pipe products. As a protective atmosphere, the treated steel pipes are bright and uniform in color without any new decarburization layer.

[0043] In an optional embodiment of the present application, as shown in Figures 3 and 4, the processing furnace main body 10 includes a furnace mouth 61 and a furnace door 62 configured to open and close the furnace mouth 61, and the furnace door 62 includes a front furnace door and a rear furnace door. The front furnace door is arranged on the furnace mouth 61 of the ventilation section, and is located between the loading section and the ventilation section. The rear furnace door is arranged on the furnace mouth 61 of the slow cooling section 600, and is located between the slow cooling section 600 and the discharging section. The safety control system of the heat treatment furnace also includes a furnace door height adjustment device 63, and the furnace door height adjustment device 63 is configured to adjust the opening height of the furnace door 62; the control module 7 is electrically connected to the furnace door height adjustment device 63, and the control module 7 is also configured to control the furnace door height adjustment device 63 to close the furnace door 62 when the working state of the processing furnace main body 10 is to open the furnace or stop the furnace.

[0044] The furnace door height adjustment device 63 refers to a device that can move the furnace door 62 to adjust the opening height of the furnace door 62. When the opening height of the furnace door 62 is different, the size of the exposed furnace opening 61 is also different. Since the heat-treated steel pipe needs to enter the interior of the treatment furnace body 10 through the furnace opening 61, the size of the furnace opening 61 that needs to be reserved is also different when the steel pipe size is different. Therefore, the opening height of the furnace door 62 can be adjusted according to the size of the steel pipe to make the furnace opening 61 different in size. Optionally, the furnace door height adjustment device 63 includes a motor and a transmission mechanism. When the motor rotates, the transmission mechanism drives the furnace door 62 to rise and fall, thereby adjusting the opening height of the furnace door 62. The transmission mechanism may include gears and racks, etc., the transmission mechanism may also include screws and nuts, etc., and the transmission mechanism may also include belts, etc. The structure of the transmission mechanism is not limited here, and it is only necessary to realize that the rotational torque output by the motor can be converted into linear thrust. Optionally, the furnace door height adjustment device 63 may also include power components such as an electric push rod, a cylinder or an oil cylinder. As long as it can drive the furnace door 62 to move to adjust the opening height of the furnace door 62, the structure of the furnace door height adjustment device 63 is not limited here.

[0045] The control module 7 controls the furnace door height adjustment device 63 to close the furnace door 62 when the working state of the processing furnace main body 10 is to open the furnace or shut down the furnace, thereby effectively improving the replacement speed and establishment speed of the generating atmosphere inside the processing furnace main body 10, reducing the amount of gas used when purging nitrogen and establishing the generating atmosphere, and saving the time of opening and shutting down the furnace.

[0046] In an optional embodiment of the present application, the control module 7 is further configured to control the height adjustment device 8 to close the furnace door 62 when the operating state of the processing furnace body 10 is production and the oxygen content is higher than a preset oxygen threshold. Since the control module 7 controls the safety nitrogen submodule to activate nitrogen purge when the operating state of the processing furnace body 10 is production and the oxygen content is higher than the preset oxygen threshold, closing the furnace door 62 at this time helps the safety nitrogen to quickly reduce the oxygen content.

[0047] Furthermore, when the main processing furnace 10 is in production mode, if the oxygen content exceeds the standard, the control module 7 controls the safety nitrogen submodule to start nitrogen purge. At the same time, the control module 7 is configured to monitor the feeding status of the ventilation section and the discharging status of the slow cooling section 600 of the heat treatment furnace. When the feeding of the ventilation section is completed, the feeding is stopped and the front furnace door is closed. When the discharging of the slow cooling section 600 is completed, the discharging is stopped and the rear furnace door is closed. Feeding and discharging are resumed until the oxygen content falls below a preset oxygen threshold.

[0048] In an optional embodiment of the present application, the safety control system of the heat treatment furnace also includes an opening scale, which is set to indicate the opening height of the furnace door 62; the control module 7 is also set to: obtain the material size, and control the furnace door height adjustment device 63 to adjust the opening height of the furnace door 62 based on the material size.

[0049] The opening scale is a scale that indicates the opening height of the furnace door 62. The opening height of the furnace door 62 can reflect the size of the exposed furnace opening 61. The material size refers to the size of the material to be heat treated. In this embodiment, the material is a steel pipe, and the material size is the diameter of the steel pipe.

[0050] By controlling the furnace door height adjustment device 63 to adjust the opening height of the furnace door 62 based on the material size, the opening height of the furnace door 62 can be more closely matched with the material size, preventing the opening height of the furnace door 62 from being too large, saving the gas consumption of the reducing gas and adjusting the pressure balance.

[0051] Optionally, in one embodiment, the material size includes the diameter of the steel pipe, and the control module 7 is configured to control the furnace door height adjustment device 63 to adjust the opening height of the furnace door 62 until the difference between the opening height of the furnace door 62 and the steel pipe diameter is less than a preset difference.

[0052] In an optional embodiment of the present application, the material has different feeding modes. The feeding mode refers to the mode in which the material to be heat treated enters the interior of the treatment furnace body 10. The feeding modes include continuous feeding and step feeding. In continuous feeding, the furnace door 62 is always open at a certain opening height based on the size of the material, and the material enters the interior of the treatment furnace body 10 at a preset process speed for heat treatment. In step feeding, the furnace door 62 opens when the interior of the treatment furnace body 10 meets the feeding conditions. After the material enters the interior of the treatment furnace body 10 and reaches the specified position, the furnace door 62 is closed to heat treat the material.

[0053] In an optional embodiment of the present application, as shown in Figures 5 and 6, the safety control system of the heat treatment furnace also includes a fire curtain device 64 and an automatic ignition burner device 65. The automatic ignition burner device 65 is configured to ignite the fire curtain device 64 so that the fire curtain device 64 forms a flame isolation zone at the furnace mouth 61.

[0054] The automatic ignition burner device 65 is a device capable of generating sparks and igniting combustible gases. Optionally, the automatic ignition burner device 65 includes an igniter. An igniter (English name: igniter) is a device that can instantly provide sufficient energy to ignite pulverized coal, oil (or gas) fuel and stabilize the flame. The automatic ignition burner device 65 can also be other devices capable of igniting combustible gases, and is not limited here.

[0055] The flame curtain device 64 is a device that can be ignited to create a flame isolation zone. The flame curtain device 64 can be positioned below the furnace opening 61 of the processing furnace body 10, so that the flame isolation zone formed by the flame curtain device 64 can be located at the furnace opening 61. Optionally, the flame curtain device 64 includes a hollow device body having an air inlet 661 and multiple air outlets. Combustible gas enters the device body through the air inlet 661 and is then discharged through the air outlets. The automatic ignition burner device 65 ignites the combustible gas discharged from the air outlets, thereby forming a flame isolation zone. The combustible gas can be natural gas.

[0056] Since the automatic ignition burner device 65 can ignite the fire curtain device 64 so that the fire curtain device 64 forms a flame at the furnace mouth 61, the combustible gas inside the processing furnace body 10 will be burned when it reaches the furnace mouth 61. At the same time, the oxygen outside the furnace will not enter the interior of the processing furnace from the furnace mouth 61 due to the isolation effect of the flame isolation zone, which can play the role of isolating the gases inside and outside the furnace.

[0057] In an optional embodiment of the present application, as shown in Figure 5, the safety control system of the heat treatment furnace also includes a smoke exhaust hood 66 and a smoke exhaust fan. The smoke exhaust hood 66 is arranged above the furnace port 61, and the smoke exhaust fan is configured to generate negative pressure in the smoke exhaust hood 66; the smoke exhaust hood 66 has an air inlet 661 and a smoke exhaust port 662, the air inlet 661 faces the furnace port 61, and the smoke exhaust port 662 is connected to the exhaust manifold.

[0058] The exhaust fan is a machine that quickly removes gases. It features excellent high-temperature resistance and high efficiency. The exhaust fan creates a negative pressure in the exhaust hood 66, allowing the atmosphere escaping from the furnace opening 61 to enter the exhaust hood 66 through the air inlet 661. The atmosphere is collected within the hood and then exhausted through the exhaust manifold. Water vapor and other gases are also removed.

[0059] Optionally, there are multiple smoke exhaust ports 662. The safety control system of the heat treatment furnace also includes an exhaust main duct. The smoke exhaust port 662 is connected to the exhaust main duct through an exhaust manifold. A smoke exhaust fan can be set in the exhaust main duct, so that the generating atmosphere inside the treatment furnace body 10 that overflows from the furnace port 61 is burned at the furnace port 61, and the generating atmosphere that overflows from the steel pipe entering the inside of the treatment furnace body 10 has a tendency to diffuse upward because its density is lighter than air and its temperature is significantly higher than room temperature. It is assisted by the negative pressure generated by the smoke exhaust fan and is collected in the smoke exhaust hood 66. It is collected into the exhaust main duct through the exhaust manifold and then discharged outdoors. A long-lasting flame is set in the exhaust manifold to discharge the incompletely burned overflowing generating atmosphere after combustion to prevent the generating atmosphere from escaping. A butterfly valve is set on the exhaust manifold. The butterfly valve is set to control the conduction and disconnection of the exhaust manifold, so the butterfly valve can be opened as needed to discharge the generating atmosphere.

[0060] In an optional embodiment of the present application, as shown in Figures 1 and 7 , the processing furnace body 10 includes a rapid cooling section 500, which includes a rapid cooling chamber 501. Rapid cooling chamber 501 includes an air cooling device 2, which is configured to cool the workpiece. Air cooling device 2 includes a fan 21, which is configured to blow low-temperature reducing process gas toward the workpiece. The workpiece is the steel mentioned above, and the process gas is the generating atmosphere mentioned above. Hereinafter, the process gas will be used instead of the generating atmosphere, and the workpiece will be used instead of the steel.

[0061] The control module 7 is electrically connected to the fan 21. The control module 7 is also configured to control the fan 21 to operate at a first speed when the working state of the processing furnace main body 10 is to open the furnace or stop the furnace, and to control the fan 21 to operate at a second speed when the working state is production, wherein the first speed is lower than the second speed.

[0062] During the heat treatment of steel pipes, it is usually necessary to heat the steel pipes and then cool them down quickly. The fast cooling section 500 refers to a region in the treatment furnace body 10 that is configured to cool the heated steel pipes.

[0063] The process gas refers to the gas required by the production process to provide anti-oxidation protection for the workpiece. In this embodiment, the process gas includes carbon monoxide, hydrogen and nitrogen, and may also include hydrocarbon gases, which are mixed in a certain proportion; the process gas fills the entire normalizing furnace, and the process gas in the rapid cooling chamber 501 cools the workpiece. The workpiece in the slow cooling section 600 is also under the anti-oxidation protection of the process gas, which can prevent the surface of the workpiece from oxidation and decarburization, achieve the effect of bright surface and no new decarburization layer, and improve the production quality of the product.

[0064] The fan 21 is a driven fluid machine that relies on input mechanical energy to increase gas pressure and discharge the gas. Because the rapid cooling section 500 may have some right-angled dead zones that can cause poor convection, and because the process gas may include gases of varying molecular weights, the fan 21 stirs the gas within the furnace body 10 when activated. Operating at a low speed during non-production, the fan 21 expels oxygen from the furnace body 10 as quickly as possible during operation. It also distributes the process gas more thoroughly within the furnace body 10 after it is introduced, preventing stratification. During shutdown, the fan 21 stirs the gas within the furnace body 10, allowing nitrogen to more fully expel combustible gases from the furnace body 10, effectively preventing furnace explosions caused by combustible gases and improving production safety.

[0065] Optionally, the rapid cooling chamber 501 includes a conveying device 1 configured to convey workpieces; and an air cooling device 2 configured to cool the workpieces on the conveying device 1 .

[0066] Optionally, the air cooling device 2 also includes an air supply pipe 22, one end of which is connected to the gas outlet of the fan 21, and the other end of the air supply pipe 22 extends to one side of the conveying device 1. The air supply pipe 22 is configured to guide the process gas output by the fan 21 to blow toward the workpiece on the conveying device 1, thereby cooling the workpiece.

[0067] Optionally, at least one cooling air knife 23 is provided at one end of the air duct 22 extending to the conveyor 1. The air duct 22 is connected to the cooling air knife 23. The length direction of the cooling air knife 23 is parallel to the axial direction of the support roller of the conveyor 1. The cooling air knife 23 has multiple exhaust ports along its length, and the exhaust ports face the conveyor 1. Multiple cooling air knives 23 arranged in parallel spray process gas at high speed onto the surface of the workpiece, completing heat exchange with the workpiece. When the workpiece is conveyed on the support roller of the conveyor 1, the length direction of the workpiece is perpendicular to the axial direction of the support roller or the length direction of the workpiece forms an angle with the axial direction of the support roller. To ensure that every part of the workpiece can be directly blown by the cooling air knife 23, in this embodiment, the cooling air knife 23 is arranged parallel to the support roller of the conveyor 1. When the workpiece slides over the support roller, the workpiece is also blown by the cooling air knife 23. In this embodiment, the number of cooling air knives 23 can be set according to actual needs.

[0068] Optionally, as shown in Figures 7-9, the air duct 22 extends to one end of the conveyor 1 and includes an upper exhaust duct 221 and a lower exhaust duct 222 that are branched. The upper exhaust duct 221 extends to the upper side of the conveyor 1, and the lower exhaust duct 222 extends to the lower side of the conveyor 1. The upper exhaust duct 221 and the lower exhaust duct 222 are respectively connected to cooling air knives 23. Multiple cooling air knives 23 arranged in parallel are provided on the upper and lower sides of the conveyor 1 to improve the cooling effect on the workpiece.

[0069] Optionally, a process gas inlet 223 is provided on the air duct 22, and process gas enters the interior of the air duct 22 from the process gas inlet 223. By adding lower temperature process gas from the process gas inlet 223, the rapid cooling effect of the rapid cooling chamber 501 can be maintained.

[0070] The process gas enters the interior of the air duct 22 from the process gas inlet 223, and can be fully stirred by the drive of the fan 21 to avoid obvious stratification of the components of the process gas, such as avoiding stratification of hydrogen with lighter molecular weight and nitrogen with heavier molecular weight. The process gas is blown toward the workpiece from the exhaust port of the cooling air knife 23, and the temperature of the process gas rises. Then, the process gas follows the workpiece to the slow cooling section 600. This part of the process gas creates a protective atmosphere for the workpiece in the slow cooling section 600 to ensure that the workpiece is not oxidized in the slow cooling section 600 in the low-temperature area.

[0071] Optionally, the impeller air intake port 211 of the fan 21 faces the conveying device 1 , and the impeller air intake port 211 of the fan 21 inhales the process gas after the workpiece is cooled, thereby realizing the recycling of the gas.

[0072] Optionally, as shown in Figures 1 and 8, the quick cooling chamber 501 includes an isolation device 3, the isolation device 3 includes a front-end air-blocking component 31 located upstream of the air-cooling device 2 and a rear-end air-blocking component 32 located downstream of the air-cooling device 2, the front-end air-blocking component 31 has a front-end opening 311, and the rear-end air-blocking component 32 has a rear-end opening 321, the conveying device 1 passes through the front-end opening 311 and the rear-end opening 321 in sequence along the logistics direction, and the front-end opening 311 is smaller than the rear-end opening 321.

[0073] The conveying device 1 transports the workpiece to the interior of the rapid cooling chamber 501 , and the air cooling device 2 blows low-temperature reducing process gas toward the workpiece.

[0074] In this embodiment, the isolation device 3 is provided with a front opening 311 and a rear opening 321 for avoiding the conveying device 1. Therefore, a part of the process gas flows from the front opening 311 to the heating section 300 of the normalizing furnace, and a part of the process gas flows from the rear opening 321 to the slow cooling section 600 of the normalizing furnace, thereby balancing the air pressure at both ends of the fast cooling section 500. In this embodiment, the fast cooling chamber 501 makes the front opening 311 smaller than the rear opening 321, which increases the difficulty of the process gas flowing to the heating section 300, forcing most of the process gas in the fast cooling chamber 501 to flow to the slow cooling section 600. The gas flows to the slow cooling section 600, slowly cooling the workpiece. Compared to related technologies that use specialized cooling gas, this saves energy required to cool the heated cooling gas again. Only a very small portion of the process gas enters the heating section 300 from the rapid cooling chamber 501, reducing the impact of the low-temperature process gas on the temperature of the heating section 300 and ensuring a more stable temperature in the heating section 300. The process gas cools the workpiece while preheating itself. Even after the heated process gas enters the heating section 300, it can prevent excessive temperature fluctuations in the heating section 300. In this embodiment, the workpiece is a steel pipe.

[0075] Optionally, as shown in FIG. 7 to FIG. 9 , at least one of the front opening 311 and the rear opening 321 is adjustable in size.

[0076] In this embodiment, the opening sizes of both the front opening 311 and the rear opening 321 are adjustable, thereby controlling the flow direction and overflow of the process gas and adapting to workpieces of different sizes. In other embodiments, the opening size of either the front opening 311 or the rear opening 321 is adjustable.

[0077] Optionally, the front air blocking assembly 31 includes a front upper curtain 312 and a front lower pier 313. The front upper curtain 312 and / or the front lower pier 313 can be adjusted in the vertical direction, and the bottom of the front upper curtain 312 and the top of the front lower pier 313 are spaced apart to form a front opening 311.

[0078] Optionally, the front upper curtain 312 includes a front mounting member and a high-temperature gas-blocking curtain. The high-temperature gas-blocking curtain is mounted on the front mounting member and can follow the front mounting member toward or away from the front lower pier 313. The high-temperature gas-blocking curtain is an existing product that is configured to slow the flow of process gas and reduce its escape.

[0079] In this embodiment, the front upper curtain 312 is adjustable in the vertical direction, and the front lower pier 313 is fixed. When the size of the front opening 311 needs to be adjusted, the front upper curtain 312 is raised or lowered to adjust the size of the front opening 311. In other embodiments, both the front upper curtain 312 and the front lower pier 313 are adjustable in the vertical direction, or the front upper curtain 312 is fixed and the front lower pier 313 is adjustable in the vertical direction.

[0080] Optionally, the rear end air blocking assembly 32 includes a rear end upper curtain 322 and a rear end lower pier 323. The rear end upper curtain 322 and / or the rear end lower pier 323 can be adjusted in the vertical direction, and the bottom of the rear end upper curtain 322 and the top of the rear end lower pier 323 are spaced apart to form a rear end opening 321.

[0081] Optionally, the rear end upper curtain 322 includes a rear end mounting piece and a high temperature resistant gas blocking curtain. The high temperature resistant gas blocking curtain is installed on the rear end mounting piece. The high temperature resistant gas blocking curtain can follow the rear end mounting piece to approach or move away from the rear end lower pier 323, and is configured to slow down the flow of process gas and reduce the escape of process gas.

[0082] In this embodiment, the rear upper curtain 322 is adjustable in the vertical direction, and the rear lower pier 323 is fixed. When the size of the rear opening 321 needs to be adjusted, the rear upper curtain 322 is raised or lowered to adjust the size of the rear opening 321. In other embodiments, both the rear upper curtain 322 and the rear lower pier 323 are adjustable in the vertical direction, or the rear upper curtain 322 is fixed and the rear lower pier 323 is adjustable in the vertical direction.

[0083] Optionally, one side of the front air blocking component 31 and one side of the rear air blocking component 32 are respectively provided with observation windows, through which the front opening 311 and the rear opening 321 can be observed respectively.

[0084] Optionally, a photoelectric detection device is provided on one side of the front air blocking component 31 and one side of the rear air blocking component 32 , respectively, and the photoelectric detection device is configured to detect the size of the front opening 311 and the size of the rear opening 321 .

[0085] The structures of the observation window and the photoelectric detection device can refer to existing products and will not be shown in this embodiment.

[0086] Optionally, as shown in Figures 1 and 8 , the rapid cooling section 500 includes multiple rapid cooling chambers 501 as described above. In this embodiment, the number of rapid cooling chambers 501 can be set according to actual needs; between adjacent rapid cooling chambers 501, the rear end of the upstream rapid cooling chamber 501 is provided with a rear air blocking assembly 32, and the front end of the downstream rapid cooling chamber 501 is provided with a front air blocking assembly 31, thereby reducing mutual interference between adjacent rapid cooling chambers 501.

[0087] Optionally, for two adjacent quick cooling chambers 501, a process gas inlet (not shown in the figure) is provided between the rear end upper curtain of the quick cooling chamber 501 located at the upstream position and the front end upper curtain of the quick cooling chamber 501 located at the downstream position. The process gas can enter the quick cooling chamber from the above-mentioned process gas inlet 223, or enter the quick cooling section from the process gas inlet, and then be sucked in by the fan 21 for circulation.

[0088] Optionally, as shown in Figures 1 and 7, a heat preservation zone 400 is provided between the heating section 300 and the rapid cooling section 500. The heat preservation zone 400 is provided with a heat preservation device 5. The heat preservation device 5 includes a heat preservation upper curtain 51 and a heat preservation lower pier 52. The heat preservation upper curtain 51 and / or the heat preservation lower pier 52 are adjustable in the vertical direction. A heat preservation opening 53 is formed between the bottom of the heat preservation upper curtain 51 and the top of the heat preservation lower pier 52. The workpiece input from the heating section 300 passes through the heat preservation opening 53 and enters the rapid cooling section 500. In this embodiment, the heat preservation device 5 is used to isolate the temperature difference between the heating section 300 and the rapid cooling section 500, thereby reducing the impact of the gas inside the rapid cooling section 500 on the heating section 300.

[0089] Optionally, the insulation upper curtain 51 includes an insulation mounting piece and a high-temperature resistant air-blocking curtain. The high-temperature resistant air-blocking curtain is installed on the insulation mounting piece, and the high-temperature resistant air-blocking curtain can follow the insulation mounting piece to approach or move away from the insulation lower pier 52.

[0090] Optionally, the heat preservation device 5 is provided with a process gas inlet 54 , and the process gas enters the heat preservation opening 53 from the process gas inlet 54 .

[0091] The process gas enters the insulation opening 53 from the process gas inlet 54. This part of the process gas forms an air curtain, which blocks the fast-flowing process gas inside the rapid cooling chamber 501 outside the heating section 300 and flows more toward the slow cooling section 600. The insulation opening 53 is smaller than or equal to the front end opening 311 of the adjacent rapid cooling chamber 501. The insulation zone 400 is located at the tail end of the heating section 300. The air curtain can also force the process gas downstream of the heating section 300 to move upstream of the heating section 300, so that the flow direction of the process gas inside the heating section 300 is opposite to the logistics direction, thereby realizing the flow field function.

[0092] Optionally, the rear end opening 321 of the quick cooling chamber 501 located at the upstream position is smaller than or equal to the front end opening 311 of the quick cooling chamber 501 located at the downstream position.

[0093] All the front openings 311 and rear openings 321 of the quick cooling section 500 gradually increase in size along the logistics direction, and utilize the temperature difference and pressure difference to guide the process gas in the quick cooling chamber 501 to flow more toward the slow cooling section 600, so that the temperature fluctuation of the heating section 300 is smaller. The workpiece in the slow cooling section 600 is in a protective atmosphere of reducing process gas, which can improve the production quality of the product.

[0094] In this embodiment, the rear end lower pier 323 of the quick cooling chamber 501 located at the upstream position and the front end lower pier 313 of the quick cooling chamber 501 located at the downstream position are integrally provided.

[0095] In this embodiment, the rear upper curtain 322 of the quick cooling chamber 501 located at the upstream position and the front upper curtain 312 of the quick cooling chamber 501 located at the downstream position are raised and lowered synchronously.

[0096] Optionally, as shown in Figures 7 and 8, the fast cooling section 500 also includes a box body 4, and a plurality of fast cooling chambers 501 connected side by side are arranged inside the box body 4, and one or more of the top wall, side wall and bottom wall of the box body 4 are provided with a water cooling interlayer 41.

[0097] In this embodiment, the top wall, side wall and bottom wall of the box body 4 are all provided with a water-cooling interlayer 41. The external water-cooling circulation equipment injects cold water into the water-cooling interlayer 41. The cold water absorbs the heat of the quick cooling chamber 501 through the inner wall of the box body 4 and then flows back to the water-cooling circulation equipment. In the quick cooling chamber 501, the temperature of the gas increases after cooling the workpiece. This part of the gas is cooled by contacting the inner wall of the box body 4 and exchanging heat with the cold water in the water-cooling interlayer 41.

[0098] Example 2

[0099] A second embodiment of the present application provides a heat treatment furnace, as shown in FIG1 , which includes a treatment furnace body 10 and a safety control system for the heat treatment furnace of any embodiment of the present application.

[0100] In an optional embodiment of the present application, the processing furnace main body 10 includes a rapid cooling section 500 .

[0101] In an optional embodiment of the present application, as shown in FIG3 , the processing furnace body 10 includes a furnace opening 61 and a furnace door 62 configured to open and close the furnace opening 61 .

[0102] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the multiple steps described in this application can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this application can be achieved. This is not limited herein.

Claims

1. A safety control system for a heat treatment furnace, applied to a heat treatment furnace, the heat treatment furnace comprising a treatment furnace body, the safety control system for the heat treatment furnace comprising an oxygen content monitoring component, an atmosphere module, a nitrogen module and a control module; The oxygen content monitoring component is configured to monitor the oxygen content inside the treatment furnace body; The atmosphere module is configured to output or cut off the output of reducing gas to the interior of the treatment furnace body; the nitrogen module is configured to output or cut off the output of nitrogen to the interior of the treatment furnace body; the reducing gas and the nitrogen constitute the generated atmosphere inside the treatment furnace body; The input end of the control module is electrically connected to the oxygen content monitoring component, and the output end of the control module is electrically connected to the atmosphere module and the nitrogen module respectively. The control module is configured to obtain the oxygen content in real time, obtain the working status of the processing furnace body in real time, and control the atmosphere module and the nitrogen module based on the oxygen content and the working status to enable the reducing gas to be output or cut off from being output to the inside of the processing furnace body, and to enable the nitrogen to be output or cut off from being output to the inside of the processing furnace body.

2. The safety control system of the heat treatment furnace according to claim 1, wherein: The nitrogen module includes a process nitrogen submodule, and the process nitrogen submodule is configured to output or cut off the output of process nitrogen to the interior of the treatment furnace body; The control module is configured to: when the working state of the processing furnace main body is to open the furnace, determine whether the oxygen content is higher than a preset oxygen content threshold value; in response to the oxygen content being higher than the preset oxygen content threshold value, control the process nitrogen submodule to output the process nitrogen to the inside of the processing furnace main body; and when the oxygen content is less than or equal to the preset oxygen content threshold value, control the atmosphere module to output the reducing gas to the inside of the processing furnace main body.

3. The safety control system of the heat treatment furnace according to claim 1, wherein: The nitrogen module includes a safety nitrogen submodule, and the safety nitrogen submodule is configured to output or cut off the output of safety nitrogen to the interior of the treatment furnace body; The control module is configured to: when the working state of the processing furnace main body is production, determine whether the oxygen content is higher than a preset oxygen content threshold value, and in response to the oxygen content being higher than the preset oxygen content threshold value, control the atmosphere module to cut off the output of the reducing gas to the inside of the processing furnace main body, and control the safety nitrogen submodule to output the safety nitrogen to the inside of the processing furnace main body until the oxygen content is less than or equal to the preset oxygen content threshold value, and when the oxygen content is less than or equal to the preset oxygen content threshold value, control the atmosphere module to output the reducing gas to the inside of the processing furnace main body so that the processing furnace main body continues production.

4. The safety control system of the heat treatment furnace according to claim 1, further comprising a combustible gas monitoring component, wherein the combustible gas monitoring component is configured to monitor the combustible gas content inside the treatment furnace body, and the nitrogen module comprises a safety nitrogen submodule, wherein the safety nitrogen submodule is configured to output or cut off the output of safety nitrogen to the inside of the treatment furnace body; The control module is configured to: when the working state of the processing furnace main body is shutdown, control the atmosphere module to cut off the output of the reducing gas to the inside of the processing furnace main body, control the safety nitrogen sub-module to output the safety nitrogen to the inside of the processing furnace main body, and obtain the combustible gas content, determine whether the oxygen content is higher than a preset oxygen content threshold and whether the combustible gas content is less than a preset combustible gas content threshold, and when the oxygen content is less than or equal to the preset oxygen content threshold and the combustible gas content is less than or equal to the preset combustible gas content threshold, control the processing furnace main body to start cooling.

5. The safety control system of the heat treatment furnace according to any one of claims 1 to 4, wherein: The reducing gas includes at least one of hydrogen, carbon monoxide and hydrocarbon combustible gas.

6. The safety control system of the heat treatment furnace according to any one of claims 1 to 4, wherein: The treatment furnace body comprises a rapid cooling section, the rapid cooling section comprises at least one rapid cooling chamber, each of the rapid cooling chambers is provided with an air cooling device, the air cooling device comprises a fan, and the fan is configured to cool the steel by blowing the generated atmosphere; The control module is electrically connected to the fan, and is further configured to control the fan to operate at a first speed when the working state of the processing furnace body is to start the furnace or stop the furnace, and to control the fan to operate at a second speed when the working state is in production, wherein the first speed is lower than the second speed.

7. The safety control system of the heat treatment furnace according to claim 6, wherein: The treatment furnace body also includes a conveying device, which is configured to convey steel; The air cooling device also includes an air supply pipe, one end of which is connected to the gas output port of the fan, and the other end of which extends to one side of the conveying device. The air supply pipe is configured to guide the generated atmosphere output by the fan to blow toward the steel on the conveying device.

8. The safety control system of the heat treatment furnace according to claim 7, wherein: The air delivery pipe is provided with a process gas input port, and the generated atmosphere enters the interior of the air delivery pipe from the process gas input port.

9. The safety control system of the heat treatment furnace according to claim 6, wherein: The quick cooling chamber also includes an isolation device; The isolation device includes a front-end air-blocking component located upstream of the air-cooling device and a rear-end air-blocking component located downstream of the air-cooling device, the front-end air-blocking component has a front-end opening, the rear-end air-blocking component has a rear-end opening, the conveying device passes through the front-end opening and the rear-end opening in sequence along the logistics direction, and the front-end opening is smaller than the rear-end opening.

10. A heat treatment furnace, comprising a treatment furnace body and the safety control system of the heat treatment furnace according to any one of claims 1 to 9.

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