All argon gas titanium material and all hydrogen gas stainless steel cover type annealing furnace system

Abstract

The utility model discloses a full argon titanium material and full hydrogen stainless steel cover type annealing furnace system, include: cover type furnace main unit, inlet unit and discharge unit, cover type furnace main unit includes: cover type furnace table and inner cover, and cover type furnace table and inner cover enclose and form annealing space, and annealing space is used for accommodating the coil of the annealing material and protective gas, inlet unit and discharge unit all are linked with inner cover, and inlet unit is used for supplying nitrogen, hydrogen or inert gas to annealing space, and discharge unit is used for leading out the gas in annealing space, inlet unit includes parallel hydrogen inlet pipeline, nitrogen inlet pipeline and argon inlet pipeline, discharge unit includes parallel nitrogen air discharge pipeline, hydrogen nitrogen discharge pipeline and argon discharge pipeline, is used respectively for discharging processing corresponding gas, and discharge unit is configured to open a discharge pipeline at the same time, avoids gas mixed discharge security risk. Through setting up three kinds of gas independent supply and exhaust pipeline, realize titanium coil and stainless steel coil annealing.

Description

Technical Field

[0001] This utility model relates to the field of non-ferrous metallurgical technology, specifically to a bell-type annealing furnace system for titanium materials annealed under all-argon gas and stainless steel materials annealed under all-hydrogen gas. In particular, it is a bell-type annealing furnace system with both argon-gas titanium coil annealing and hydrogen-gas stainless steel coil annealing functions. Background Technology

[0002] Bell-type annealing furnaces are key equipment in the field of metal coil processing. They are mainly suitable for annealing of ferrous metal (such as stainless steel coils) and non-ferrous metal (such as titanium coils) coils, especially for annealing scenarios that require a protective atmosphere. In this scenario, the protective gas can isolate gases such as air and avoid harmful chemical reactions to ensure the metal properties.

[0003] The current bell-type annealing furnace system has the problem that it can only perform annealing operations in a single atmosphere and for a single metal type. For example, titanium coils need to be annealed separately in an argon atmosphere, or stainless steel coils need to be annealed separately in a hydrogen atmosphere. This means that a single bell-type annealing furnace cannot simultaneously meet the annealing needs of titanium and stainless steel coils, resulting in low operational flexibility. If a company needs to process titanium and stainless steel coils simultaneously, it must purchase multiple independently operating sets of equipment, which will increase the company's costs in terms of equipment procurement and space occupancy.

[0004] A Chinese patent with publication number CN102409146B discloses a method and apparatus for annealing titanium coils under a protective cover. It employs a combination of vacuuming and argon gas replacement and protection to rapidly and efficiently achieve the required purity of the atmosphere within the cover for titanium coil annealing. However, its functionality is limited, only adapting to argon as the protective gas and unable to switch to other atmospheres such as hydrogen. Therefore, it can only be used for annealing titanium coils and cannot be extended to the processing of other metal coils such as stainless steel coils.

[0005] Patent document CN203200318U discloses an inert gas protective annealing furnace for cold-rolled titanium strip coils. It features nitrogen and inert gas inlet pipes, enabling switching between hydrogen and inert gas protective atmospheres, allowing for the annealing of both ordinary steel strip coils and titanium coils on the same furnace. Its drawback is that it only implements the basic function of switching between hydrogen and inert gas atmospheres, without considering the synergistic effect of flow rate and pressure on the surface quality of the coil. Utility Model Content

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a bell-type annealing furnace system using all-argon titanium and all-hydrogen stainless steel.

[0007] According to the present invention, a bell-type annealing furnace system for titanium and stainless steel with all argon gas and all hydrogen gas is provided, comprising: a bell-type furnace main unit, an inlet unit and an outlet unit; The bell-type furnace main unit includes: a bell-type furnace platform and an inner cover, wherein the bell-type furnace platform and the inner cover surround to form an annealing space, and the annealing space is used to accommodate the coil of material to be annealed and the protective gas; Both the intake unit and the exhaust unit are connected to the inner cover. The intake unit is used to supply nitrogen, hydrogen or inert gas into the annealing space, and the exhaust unit is used to exhaust the gas in the annealing space. The air intake unit includes a hydrogen air intake pipeline, a nitrogen air intake pipeline, and an argon air intake pipeline connected in parallel. The emission unit includes parallel nitrogen-air emission pipelines, hydrogen-nitrogen emission pipelines, and argon emission pipelines, which are used to emit and treat the corresponding gases, respectively. The emission unit is configured to activate only one emission pipeline at a time to avoid safety hazards caused by mixed gas emissions.

[0008] Preferably, it further includes: a monitoring auxiliary unit; The monitoring auxiliary unit includes a discharge pressure transmitter and a flow control valve. The discharge pressure transmitter is connected to the bell-type furnace main unit and is used to monitor the pressure in the annealing space. The flow control valve is located upstream of the discharge pipeline in the discharge unit and is used to monitor the flow rate of the gas discharged from the annealing space.

[0009] Preferably, it also includes: a Roots flow meter; The Roots flow meter is installed between the air inlet unit and the bell furnace main unit to measure the real-time flow rate of gas flowing into the annealing space. The control terminal of the all-argon titanium and all-hydrogen stainless steel bell-type annealing furnace system is configured to read the flow data of the Roots flow meter and adjust the opening of the flow control valve in conjunction with the flow data.

[0010] Preferably, the hydrogen inlet pipeline includes: a first hydrogen inlet solenoid valve, a hydrogen inlet pressure transmitter, and a second hydrogen inlet solenoid valve arranged in series from upstream to downstream. The hydrogen inlet pressure transmitter determines whether there is internal leakage between the two valves by monitoring whether the pressure between the first hydrogen inlet solenoid valve and the second hydrogen inlet solenoid valve is within a preset range. A nitrogen inlet pneumatic valve is installed on the nitrogen inlet pipeline, and a nitrogen bypass solenoid valve is installed in parallel on the side of the nitrogen inlet pneumatic valve. The nitrogen bypass solenoid valve is used to conduct emergency opening when the nitrogen inlet pneumatic valve fails and becomes blocked.

[0011] Preferably, the monitoring auxiliary unit further includes an oil removal device for removing oil and dust carried in the gas flowing through it.

[0012] Preferably, the flow control valve is capable of operating from 0 to 40 Nm. 3 Adjust the flow rate range to / h.

[0013] Preferably, the nitrogen supplied by the air intake unit has the following parameters: purity ≥ 99.995%, dew point ≤ -65℃, and oxygen content ≤ 5ppm; the argon supplied by the air intake unit has the following parameters: purity ≥ 99.999%, dew point ≤ -65℃, and oxygen content ≤ 5ppm.

[0014] Preferably, the bell-shaped furnace main body unit further includes: a heating hood; The heating cover is positioned above the inner cover and is used to heat the annealing space through the inner cover, thereby maintaining the annealing space at a preset temperature.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model enables the system to complete the annealing of titanium coils and stainless steel coils by setting up an interlocking control structure with independent gas supply and exhaust for nitrogen, hydrogen and argon respectively, without requiring enterprises to purchase multiple sets of equipment.

[0016] 2. By adding an oil removal device and cooperating with flow control, this utility model can separate and retain the oil and dust brought out in the annealing coil, and avoid oil adhering to the pipeline or valve and affecting the gas purity.

[0017] 3. By adding a high-precision Roots flow meter, this utility model can realize the volumetric flow rate measurement of different gases and the high-precision metering of the protective gas flow rate required in the annealing process.

[0018] 4. This valve is designed with a pressure transmitter and flow control valve at the furnace outlet, which can stably control the pressure in the annealing space within a certain range, thereby supplying the protective gas to the annealing space at a stable flow rate, ensuring that the protective atmosphere in the annealing space remains clean, and thus ensuring that the coil to be annealed has excellent surface quality. Attached Figure Description

[0019] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0020] As shown in the figure: Detailed Implementation

[0021] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0022] like Figure 1 As shown, the present invention provides a bell-type annealing furnace system for titanium materials and stainless steel materials using all-argon and all-hydrogen methods, comprising a bell-type furnace main unit, an inlet unit, an outlet unit, and a monitoring auxiliary unit.

[0023] In this embodiment, the bell-type furnace main unit is the core structure for the annealing process, including a bell-type furnace platform 101 and an inner cover 102. The inner cover 102 is fastened to the bell-type furnace platform 101, forming a sealed annealing space with the platform surface. The volume of this space can accommodate different batches of coils 103 to be annealed, which can be titanium coils or stainless steel coils. A heating cover 100 is provided above the inner cover 102. The heating cover 100 can raise the temperature through electric heating or gas heating, heating the annealing space through the inner cover 102. The heating cover 100 can also be simultaneously placed on the sides and upper outer sides of the inner cover 102, thereby increasing the heat radiation area of ​​the annealing space and improving heating efficiency. Both the inner cover 102 and the bell-type furnace platform 101 can be made of heat-resistant metal. The bell-type furnace platform 101 is provided with pipe interfaces for connecting the air inlet unit and the exhaust unit.

[0024] The air intake unit adopts a parallel pipeline design, including parallel hydrogen intake pipeline, nitrogen intake pipeline and argon intake pipeline, to achieve independent supply of the three protective gases of nitrogen, hydrogen and argon, avoiding gas mixing and affecting the protection effect on material rolls of different materials.

[0025] The nitrogen inlet pipeline is primarily used for pre-purging before annealing in a full hydrogen atmosphere, replacing the air in the annealing space, and for post-treatment after annealing, replacing the hydrogen in the annealing space. A nitrogen inlet manual valve 301 and a nitrogen inlet pneumatic valve 302 are connected in series on the nitrogen inlet pipeline, with the manual valve 301 located upstream of the pneumatic valve 302. During the full hydrogen atmosphere annealing process, the manual valve 301 remains open. A nitrogen bypass solenoid valve 303 is connected in parallel beside the pneumatic valve 302, used for emergency activation in case of a malfunction or blockage in the pneumatic valve 302. By continuously supplying nitrogen to the annealing space, it maintains a positive pressure in the annealing space, preventing air backflow and infiltration. If air were to enter and be followed by hydrogen, it could lead to an explosion; this design effectively mitigates this risk.

[0026] The hydrogen inlet pipeline provides protective gas for the annealing of stainless steel coils in a full hydrogen atmosphere. A hydrogen inlet manual valve 201, a first hydrogen inlet solenoid valve 202, and a second hydrogen inlet solenoid valve 203 are connected in series on the hydrogen inlet pipeline. The hydrogen inlet manual valve 201 is located at the upstream end and is open in the full hydrogen atmosphere annealing mode and remains closed in the full argon atmosphere annealing mode. The first hydrogen inlet solenoid valve 202 and the second hydrogen inlet solenoid valve 203 form a double protection structure in series. When one solenoid valve malfunctions and leaks, the other remains closed, effectively preventing hydrogen leakage. The first hydrogen inlet solenoid valve 202 is located upstream of the second hydrogen inlet solenoid valve 203. A hydrogen inlet pressure transmitter 204 is installed on the pipeline between the two valves. This transmitter determines whether there is internal leakage in the valves by monitoring whether the pressure between the two valves is within a preset range. This transmitter can monitor the hydrogen inlet pressure in real time. When the pressure deviates from the preset range, it automatically sends an alarm signal, which not only prevents abnormal pressure from affecting the annealing quality, but also provides early warning of safety hazards caused by internal valve leakage. For example, if the pressure rises abnormally when both valves are closed, it indicates internal leakage in the first hydrogen inlet solenoid valve 202. If the initial pressure between the two valves is less than the pressure at the hydrogen supply end outside the first hydrogen inlet solenoid valve 202, and the pressure between the two valves continues to decrease, it indicates internal leakage in the second hydrogen inlet solenoid valve 203.

[0027] The argon gas inlet pipeline provides protective gas for titanium coil annealing in a full argon atmosphere. The pipeline is equipped with a series of argon gas inlet manual valve 401 and argon gas inlet pneumatic valve 402, with the argon gas inlet manual valve 401 located upstream of the argon gas inlet pneumatic valve 402.

[0028] Roots flow meter 205 is installed between the parallel main pipeline of the inlet unit and the main unit of the bell-type furnace. It is used to measure the real-time flow rate of the three protective gas flows entering the annealing space and transmits the flow data to the system control terminal. The control terminal reads the flow data of Roots flow meter 205 in real time and uses this data to precisely adjust the opening of flow control valve 106 to achieve coordinated control of inlet and outlet flow rates, ensuring the stability of the atmosphere in the annealing space.

[0029] The emission unit is equipped with independent emission pipelines based on the characteristics of different protective gases, including nitrogen-air emission pipelines, hydrogen-nitrogen emission pipelines, and argon emission pipelines. Each emission pipeline is dedicated to handling only a specific gas: the nitrogen-air emission pipeline is specifically for mixtures of air and nitrogen, the hydrogen-nitrogen emission pipeline is specifically for mixtures of hydrogen and nitrogen, and the argon emission pipeline is specifically for argon. Furthermore, the valves in each pipeline employ interlocking control logic, ensuring that only the valves of the corresponding emission pipeline are open at a time. This structural and control-level approach prevents the mixing and emission of different gases, completely eliminating safety hazards such as explosions and pollution caused by mixed emissions.

[0030] The nitrogen air emission pipeline is equipped with a nitrogen air emission pneumatic valve 501 and a nitrogen air emission manual valve 502 connected in series. An air filter can be installed at the end of the emission port to filter dust in the emission gas and prevent dust backflow. The hydrogen nitrogen emission pipeline is equipped with a hydrogen nitrogen emission pneumatic valve 503 and a hydrogen nitrogen emission manual valve 504 connected in series. A hydrogen combustion treatment device can be installed at the end of the emission port to ensure safe combustion of hydrogen before emission. The argon emission pipeline is equipped with an argon emission pneumatic valve 505 and an argon emission manual valve 506 connected in series. A check valve can be installed at the end of the emission port to prevent backflow of outdoor air.

[0031] The monitoring auxiliary unit is located between the bell-type furnace main unit and the emission unit, and includes an emission pressure transmitter 105, a flow control valve 106, and an oil removal device 104 connected in series. The emission pressure transmitter 105 is located at the upstream end of the monitoring auxiliary unit and is used to monitor pressure changes in the annealing space in real time. The first pressure range in the all-hydrogen atmosphere annealing mode is set to 4-6 kPa, and the second pressure range is set in the all-argon atmosphere annealing mode. When the pressure exceeds or falls below the corresponding range, the flow control valve 106 automatically adjusts its opening to quickly restore the pressure to the set range and prevent air infiltration.

[0032] The flow control valve 106 is located downstream of the discharge pressure transmitter 105 and can be adjusted within a flow range of 0 to 40 Nm³ / h. It also has preset dedicated flow ranges for two annealing modes: the first flow range for the all-hydrogen atmosphere annealing mode and the second flow range for the all-argon atmosphere annealing mode, which can be precisely adjusted according to the needs of different process stages.

[0033] The oil removal device 104 is located downstream of the flow control valve 106. The protective gas flows in from the inlet and out from the outlet of the oil removal device 104, passes through the oil-water separator, removes the oil and dust carried in the gas, and prevents oil from adhering to the surface of the material roll or the pipeline valve, thus ensuring the purity of the atmosphere and the quality of annealing.

[0034] The nitrogen parameters used in the all-hydrogen atmosphere annealing process for stainless steel coils are: purity ≥99.995%, dew point ≤-65℃, and oxygen content ≤5ppm; the hydrogen parameters are: purity ≥99.999%, dew point ≤-65℃, and oxygen content ≤5ppm. The argon parameters used in the all-argon atmosphere annealing process for titanium coils strictly adhere to: purity ≥99.995%, dew point ≤-65℃, and oxygen content ≤5ppm, ensuring that no harmful reactions such as oxidation or nitriding occur during the titanium coil annealing process. The manual valves on the corresponding pipelines remain open throughout this process.

[0035] This invention provides independent supply of three atmospheres, incorporating theories of atmosphere flow control, atmosphere emission, and process control for stainless steel or titanium annealing. It effectively solves the problem of producing annealed stainless steel coils for the ferrous metallurgy industry and titanium coils for the non-ferrous metallurgy industry using the same bell-type furnace equipment.

[0036] This invention enables high-precision control of the protective gas flow rate during annealing in hydrogen and argon protective atmospheres, with high furnace pressure control accuracy and excellent stability within the 4-6 kPa range. The flow regulating valve 106 is designed on the furnace discharge pipe, ensuring stable control of the protective gas flow rate from 0-40 Nm. 3 The / h volumetric flow rate for rinsing the annealed coils inside the furnace ensures the cleanliness of the annealed coil surface.

[0037] This utility model also discloses a control method for the bell-type annealing furnace system for titanium materials and stainless steel materials using all-argon gas and all-hydrogen gas, as follows: (I) Annealing process steps for stainless steel coils in a full hydrogen atmosphere S1: Pre-purging process. Close the hydrogen inlet pipeline, argon inlet pipeline, hydrogen and nitrogen exhaust pipelines, and argon exhaust pipeline (close the manual and solenoid valves on the corresponding pipelines); open the nitrogen inlet pipeline and nitrogen-air exhaust pipeline, monitor the nitrogen flow rate using the Roots flow meter 205, and adjust the opening of the flow control valve 106 based on the flow data to stabilize the nitrogen flow rate within a preset value in the first flow range; purging continues for a preset duration, during which the annealing space pressure is maintained in the first pressure range using the exhaust pressure transmitter 105; after purging, if the oxygen content in the annealing space is ≤1%, close the nitrogen inlet pipeline and nitrogen-air exhaust pipeline. By adding a nitrogen pre-purging step, nitrogen can replace the air in the furnace in advance, avoiding the safety risks caused by the mixing of hydrogen and air.

[0038] S2: Hydrogen Replacement. Open the hydrogen inlet pipeline and the hydrogen / nitrogen outlet pipeline (open the manual valve and solenoid valve on the corresponding pipeline), and adjust the flow control valve 106 based on the data from the Roots flow meter 205 to stabilize the hydrogen flow rate within the preset value in the first flow range; maintain the annealing space pressure in the first pressure range, and continue the replacement for the preset duration; when the hydrogen purity is sampled and tested to be ≥99.999%, the full hydrogen atmosphere construction is complete.

[0039] S3: Annealing Operation. Keep the hydrogen inlet and hydrogen / nitrogen outlet lines open (the corresponding manual and solenoid valves on the lines should remain open). Start the heating hood 100 to raise the temperature to the preset temperature. During the heating process, monitor the pressure using the discharge pressure transmitter 105 and adjust the hydrogen flow rate based on the data from the Roots flow meter 205 to ensure the pressure remains stable within the first pressure range. After reaching the preset temperature, maintain the temperature for the preset duration. During this period, periodically sample and test the hydrogen purity to ensure annealing quality.

[0040] S4: Cooling Operation. Remove the heating cover 100, replace it with a cooling cover, and turn off the heating device. Adjust the flow control valve 106 to stabilize the hydrogen emission flow rate within the preset hydrogen cooling flow rate value in the first flow range. After the temperature drops to the preset hydrogen cooling temperature, close the hydrogen inlet pipeline, open the nitrogen inlet pipeline, and keep the hydrogen and nitrogen emission pipelines open to replace the hydrogen with nitrogen. After sampling and testing, if the hydrogen content in the annealing space is lower than the preset nitrogen-replaced hydrogen content, close all pipelines to complete the annealing process.

[0041] (II) Argon Atmosphere Annealing Process Steps for Titanium Coils S1: Perform the pre-purging process. Close the hydrogen inlet pipeline, nitrogen inlet pipeline, nitrogen-air exhaust pipeline, and hydrogen-nitrogen exhaust pipeline; open the argon inlet pipeline and argon exhaust pipeline, and adjust the flow control valve 106 based on the data from the Roots flow meter 205 to stabilize the argon flow rate within the preset purging value in the second flow range; maintain the annealing space pressure within the second pressure range, and continue purging for the preset duration; when the oxygen content in the annealing space is sampled and detected to be ≤25ppm, the purging is complete.

[0042] S2: Argon atmosphere annealing. Keep the argon inlet and outlet lines open. During the heating or holding stage, maintain the annealing space pressure in the second pressure range. Adjust the argon flow rate to the preset argon annealing flow rate value within the second flow range to ensure that argon is continuously supplied to the annealing space and maintain the preset argon annealing pressure within the annealing space.

[0043] S3: Cooling operation. Lift the heating cover 100 and replace it with a cooling cover to start the cooling process. Adjust the flow control valve 106 to control the argon gas discharge flow rate to stabilize at the preset argon gas cooling flow rate value within the second flow range. After the temperature drops to the preset argon gas cooling temperature, close the argon gas inlet pipeline and the argon gas outlet pipeline to complete the annealing.

[0044] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0045] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A bell-type annealing furnace system using all-argon titanium and all-hydrogen stainless steel, characterized in that, include: The bell-type furnace consists of a main unit, an air intake unit, and an exhaust unit. The bell-type furnace main unit includes: a bell-type furnace platform (101) and an inner cover (102), wherein the bell-type furnace platform (101) and the inner cover (102) surround and form an annealing space, which is used to accommodate the coil of material to be annealed (103) and the protective gas; Both the intake unit and the exhaust unit are connected to the inner cover (102). The intake unit is used to supply nitrogen, hydrogen or inert gas into the annealing space, and the exhaust unit is used to exhaust the gas in the annealing space. The air intake unit includes a hydrogen air intake pipeline, a nitrogen air intake pipeline, and an argon air intake pipeline connected in parallel. The emission unit includes parallel nitrogen-air emission pipelines, hydrogen-nitrogen emission pipelines, and argon emission pipelines, which are used to emit and treat the corresponding gases, respectively. The emission unit is configured to activate only one emission pipeline at a time to avoid safety hazards caused by mixed gas emissions.

2. The all-argon titanium and all-hydrogen stainless steel bell-type annealing furnace system as described in claim 1, characterized in that, Also includes: Monitoring auxiliary unit; The monitoring auxiliary unit includes a discharge pressure transmitter (105) and a flow control valve (106). The discharge pressure transmitter (105) is connected to the bell furnace main unit and is used to monitor the pressure in the annealing space. The flow control valve (106) is located upstream of the discharge pipeline in the discharge unit and is used to monitor the flow rate of the gas discharged in the annealing space.

3. The all-argon titanium and all-hydrogen stainless steel bell-type annealing furnace system as described in claim 2, characterized in that, Also includes: Roots flow meter (205); The Roots flow meter (205) is installed between the gas inlet unit and the bell furnace main unit to measure the real-time flow rate of gas flowing into the annealing space; The control terminal of the all-argon titanium and all-hydrogen stainless steel bell-type annealing furnace system is configured to read the flow data of the Roots flow meter (205) and adjust the opening of the flow control valve (106) in conjunction with the flow data.

4. The bell-type annealing furnace system for titanium materials and stainless steel with all-argon gas as described in claim 1, characterized in that, The hydrogen inlet pipeline includes: a first hydrogen inlet solenoid valve (202), a hydrogen inlet pressure transmitter (204), and a second hydrogen inlet solenoid valve (203) connected in series from upstream to downstream. The hydrogen inlet pressure transmitter (204) determines whether there is internal leakage between the two valves by monitoring whether the pressure between the first hydrogen inlet solenoid valve (202) and the second hydrogen inlet solenoid valve (203) is within a preset range. A nitrogen inlet pneumatic valve (302) is provided on the nitrogen inlet pipeline, and a nitrogen bypass solenoid valve (303) is provided in parallel on the side of the nitrogen inlet pneumatic valve (302). The nitrogen bypass solenoid valve (303) is used to conduct emergency opening when the nitrogen inlet pneumatic valve (302) fails and becomes blocked.

5. The all-argon titanium and all-hydrogen stainless steel bell-type annealing furnace system as described in claim 2, characterized in that, The monitoring auxiliary unit further includes an oil removal device (104), which is used to remove oil and dust carried in the gas flowing through it.

6. The all-argon titanium and all-hydrogen stainless steel bell-type annealing furnace system as described in claim 2, characterized in that, The flow control valve (106) is capable of operating from 0 to 40 Nm 3 Adjust the flow rate range to / h.

7. The bell-type annealing furnace system for all-argon titanium and all-hydrogen stainless steel as described in claim 1, characterized in that, The nitrogen supplied by the intake unit has the following parameters: purity ≥ 99.995%, dew point ≤ -65℃, and oxygen content ≤ 5ppm; the argon supplied by the intake unit has the following parameters: purity ≥ 99.999%, dew point ≤ -65℃, and oxygen content ≤ 5ppm.

8. The bell-type annealing furnace system for titanium materials and stainless steel with all-argon gas as described in claim 1, characterized in that, The bell-type furnace main unit also includes: a heating hood (100). The heating cover (100) is placed above the inner cover (102) and is used to heat the annealing space through the inner cover (102), thereby achieving the heat preservation of the annealing space at a preset temperature.

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