Inert gas environment replacement method for magnesiothermy and combined air bag group structure

Abstract

The invention provides an inert gas environment replacement method for magnesium hot working and a combined air bag group structure. The combined type air bag set structure for magnesium hot working comprises an argon-filled inert gas working cabin, an overhead layer gas static pressure box is arranged at the bottom of the argon-filled inert gas working cabin, and hot working process equipment is placed at the upper end of the overhead layer gas static pressure box. A working face gas sensor is arranged in the argon-filled inert gas working cabin, an upper pipeline is fixedly connected to the outer portion of the argon-filled inert gas working cabin, an exhaust pipeline is arranged on the outer surface of the upper pipeline, and a one-way exhaust valve is arranged outside the exhaust pipeline. A working cabin electric valve is arranged outside the upper pipeline, and a heat-conducting oil storage tank and a combined air bag are arranged inside the upper pipeline. According to the inert gas environment replacement method for magnesiothermy and the combined air bag group structure, rising power generated by expansion after heating is fully utilized.

Description

Technical Field

[0001] The invention relates to the technical field of magnesium processing, in particular to an inert gas environment replacement method for magnesium hot processing and a combined air bag group structure. Background Art

[0002] For the situation of reaction with air, the current technology is to use inert gas protection, typically argon and sulfur hexafluoride, of which sulfur hexafluoride is the most commonly used. Argon protection is still in the research and partial test stage, but the greenhouse gas effect of sulfur hexafluoride is more than 20,000 times that of carbon dioxide, and large-scale application poses great environmental risks. Therefore, research on argon protection method is the focus and hot spot of current industry development. The hot processing of magnesium and similar light metals is all in a fixed space, including special electric furnaces and processing workshops. It is relatively simple to replace the air in the furnace, mainly because most of the space for storing the main materials in the furnace is magnesium material, and direct gas replacement is economical and efficient.

[0003] However, processes involving 3D printing and vapor deposition require argon as a protective gas in the entire space. It is difficult to achieve gas replacement in a large space of fixed volume. Currently, the commonly used methods include exhaust method, pressure difference method, diffusion method, and chemical method. The similar densities of air or nitrogen and argon result in slow replacement gas flow. The densities of argon and nitrogen or air are similar. During replacement, argon is heavier than air and is usually delivered from the bottom. However, the argon delivered initially uses the kinetic energy carried by a small amount of its own gas to promote the air circulation in the entire space, which requires a large kinetic energy and will cause violent mixing at the gas interface. The kinetic energy consumption of argon is very large. As the amount of argon increases, the required kinetic energy increases further.

[0004] This is different from the air circulation type constant wind speed ventilation method, which is a one-way exhaust type. Therefore, in order to maintain gas replacement, the method of directly dividing the constant volume space height by the argon gas flow rate cannot be used. The main reason is that the argon gas cannot maintain a constant speed during the rising process, and the argon gas is severely mixed with the air interface gas, and cannot be calculated according to the piston-type air supply, showing complex characteristics. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an inert gas environment replacement method for magnesium hot processing and a combined airbag group structure, which adopts an airbag to adjust the volume of the fixed volume space during the replacement and recovery stages, shortens the replacement time, reduces the consumption of expensive argon gas, improves production efficiency, and improves the economic benefits of processing. Nitrogen is used to replace the air first, which makes full use of the characteristics of a large amount of nitrogen in the air and the characteristic that nitrogen does not react with magnesium below 500°C, and solves the problems of efficient and economic replacement and efficiency improvement of staged advance heating.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an inert gas environment replacement method for magnesium hot processing and a combined airbag group structure, comprising: an argon-filled inert gas working cabin, an overhead gas static pressure box is arranged at the bottom of the argon-filled inert gas working cabin, a hot processing process equipment is placed at the upper end of the overhead gas static pressure box, a working surface gas sensor is arranged inside the argon-filled inert gas working cabin, an upper pipe is fixedly connected to the outside of the argon-filled inert gas working cabin, an exhaust pipeline is arranged on the outer surface of the upper pipe, a one-way exhaust valve is arranged outside the exhaust pipe, a working cabin electric valve is arranged outside the upper pipe, a spare replacement electric valve is arranged outside the upper pipe, a gas storage cabin airbag is fixedly connected to the front end of the upper pipe, and a gas storage cabin airbag is arranged inside the gas storage cabin;

[0007] The outer surface of the argon-filled inert gas working cabin is fixedly connected with a lower pipeline, and a compressor exhaust pipe electric valve is arranged on the outside of the lower pipeline. The lower pipeline is connected to the gas compressor and is connected from the other end to the gas storage tank side electric valve and is fixedly connected to the gas storage tank. The outer surface of the upper pipeline is provided with a working cabin side barometer, and the upper end of the gas storage tank is provided with a gas storage tank barometer, a gas storage tank air intake one-way electric valve, a gas storage tank exhaust one-way electric valve and a gas storage tank energy-consuming gas valve. A vent pipe is arranged at the side end of the gas compressor, a vent pipe one-way valve is arranged at the front end of the vent pipe, and a gas compressor vent side barometer is arranged on the outside of the vent pipe. A nitrogen pipeline is provided at the front end of the gas compressor, a gas compressor nitrogen pipeline electric valve is provided outside the nitrogen pipeline, a compressor nitrogen pipeline vaporizer outlet electric valve is provided outside the nitrogen pipeline, the nitrogen pipeline is connected to the compressor nitrogen pipeline vaporizer and is connected to the liquid nitrogen storage tank from the other end, an argon pipeline is provided at the front end of the gas compressor, a first argon pipeline electric valve is provided outside the argon pipeline, a second argon pipeline electric valve is provided outside the argon pipeline, the argon pipeline is connected to the argon vaporizer and is connected to the liquid argon storage tank from the other end, and an argon pipeline barometer and a liquid argon pressure gauge are provided outside the argon pipeline;

[0008] A combined airbag, comprising a guide rod, an internal airbag, a limit block on the upper portion of the guide rod, a counterweight plate on the top plate of the airbag, a barometer, an air-connecting pipe electric valve, a limit roller, an air intake pipe electric valve, an argon air intake pipe and a nitrogen air intake pipe;

[0009] A heat transfer oil storage tank, the heat transfer oil storage tank includes a heat transfer oil to compressor side return oil pipeline, a heat transfer oil to compressor side oil supply pipeline, a heat transfer oil to vaporizer side return oil pipeline, a heat transfer oil to vaporizer side oil supply pipeline, a heat transfer oil to compressor side circulation pump, a heat transfer oil to vaporizer side circulation pump and a heat transfer oil inner oil tank.

[0010] Preferably, an electric valve is arranged outside the exhaust pipe, and an oxygen content sensor, a nitrogen content sensor and an argon content sensor are arranged at the front end of the exhaust pipe.

[0011] Preferably, the outer surface of the upper pipe is fixedly connected with a working cabin pressure gauge, a working cabin side pipe pressure gauge, and an air storage cabin airbag pressure gauge.

[0012] Preferably, a gas compressor outlet pressure gauge is fixedly connected to the outer surface of the lower pipeline, and a gas storage tank side pressure gauge is fixedly connected to the outer surface of the lower pipeline.

[0013] Preferably, a gas compressor nitrogen pipeline barometer and a compressor nitrogen pipeline liquid nitrogen pressure gauge are provided outside the nitrogen pipeline.

[0014] Preferably: the interior of the internal airbag contacts the guide rod, the side inner wall of the internal airbag is fixedly connected to the upper limit block of the guide rod, the inner wall of the internal airbag contacts the counterweight plate of the airbag top plate, the lower surface of the internal airbag is fixedly connected to the roller with a limit, the front end of the internal airbag is fixedly connected with an air connecting pipe, the outside of the air connecting pipe is fixedly connected to the air connecting pipe electric valve, the outside of the air connecting pipe is fixedly connected to a barometer, the rear end of the internal airbag is fixedly connected with an intake pipe, the outside of the intake pipe is fixedly connected to the intake pipe electric valve, and the rear end of the intake pipe is fixedly connected to the argon intake pipe and the nitrogen intake pipe, respectively.

[0015] Preferably: the rear end of the heat transfer oil inner layer oil tank is fixedly connected to the heat transfer oil to compressor side return oil pipeline, the front end of the heat transfer oil inner layer oil tank is fixedly connected to the heat transfer oil to vaporizer side oil supply pipeline, the front end of the heat transfer oil inner layer oil tank is fixedly connected to the heat transfer oil to vaporizer side return oil pipeline, the front end of the heat transfer oil to vaporizer side return oil pipeline is connected to the heat transfer oil to vaporizer side circulation pump, the rear end of the heat transfer oil inner layer oil tank and the rear end of the heat transfer oil to compressor side oil supply pipeline are connected to the heat transfer oil to compressor side circulation pump.

[0016] The invention discloses an inert gas environment replacement method for hot processing of magnesium, based on any one of the combined airbag group structures for hot processing of magnesium, wherein the interior of the argon-filled inert gas working chamber is an inert gas space for hot processing of magnesium and similar light metals, and has a rigid enclosure structure and a constant volume space inside. The airbag is used to inject argon into the airbag during the argon replacement air stage before production to fill the space of non-process equipment and reduce the overall replacement volume. Multiple airbag groups are interconnected and combined through air-connected pipe electric valves. After reaching the set air pressure, the gas supply is stopped, and the relevant valve groups are closed to maintain constant pressure and airtightness. During the replacement process, when nitrogen or argon reaches the working surface, the gas sensor tests the oxygen, nitrogen, and argon concentrations in real time to meet the process requirements, and the hot processing process equipment can be started to start heating. When nitrogen and argon are used, the reaction temperature is controlled at 50°C minus the reaction temperature. Ensure that magnesium does not react with the gas during the first heating process. Since the hot processing equipment itself has thermal insulation measures, the temperature outside the equipment is usually below 80°C. Therefore, in the first heating stage, the displaced gas adds rising kinetic energy on the outer wall of the furnace under the action of thermal convection and thermal radiation, which will further improve the replacement efficiency. When the replacement is completed, the high-temperature magnesium does not react with argon during the second stage of melting or 3D printing, and the argon is finally recovered.

[0017] The present invention provides an inert gas environment replacement method for magnesium hot processing and a combined airbag group structure. It has the following beneficial effects:

[0018] The inert gas environment replacement method and combined airbag group structure for magnesium hot processing propose a method and structure for adjusting the internal volume of a rigid constant volume space, overcome the shortcomings of low overall gas replacement efficiency and large gas consumption in a traditional rigid constant volume space, propose a method of replacing air with nitrogen and then replacing nitrogen with argon, use economical nitrogen to replace oxygen in the air, and realize a nitrogen-inert gas direct air mixed gas. Compared with a mixed gas of air and nitrogen, it realizes inert gas protection in different temperature ranges, does not react with nitrogen before 500°C, can be heated in stages, and overcomes the problems of low air replacement efficiency and large argon consumption, and the inability to start heating in the replacement stage. In order to solve the problem of insufficient heat, a method of gas replacement under elevated temperature conditions is proposed, which innovatively utilizes the characteristics of gas expanding at a constant volume when heated and rising when heated, overcoming the shortcomings of the similar density of air and argon under normal temperature conditions, excessive rising kinetic energy of argon causing gas mixing during replacement, and insufficient rising kinetic energy due to low temperature, realizing the indirect conversion of thermal energy to kinetic energy, and proposing that the heat absorbed during the vaporization of liquid argon and nitrogen is provided by the high temperature generated by the operation of the gas compressor, reducing the heat dissipation energy consumption of the air compressor operation, and avoiding rust caused by the melting of frost on the surface of the vaporizer. In the hot state, the airflow not only utilizes the kinetic energy fed in during replacement, but also makes full use of the rising power generated by the expansion after heating, thus realizing the conversion of thermal energy to kinetic energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a side view structural schematic diagram of the present invention.

[0020] Figure 2 It is the internal cross-sectional top view of the present invention.

[0021] Figure 3 It is a schematic diagram of the structure of the combined airbag of the present invention.

[0022] Figure 4 It is a schematic diagram of the structure of the heat transfer oil storage tank of the present invention.

[0023] Figure 5 It is a connection diagram of the present invention.

[0024] Among them, 1. Argon-filled inert gas working cabin; 2. Combined airbag; 2-1. Guide rod; 2-2. Internal airbag; 2-3. Upper limit block of guide rod; 2-4. Counterweight plate of airbag top plate; 2-5. Barometer; 2-6. Gas-connected pipe electric valve; 2-7. Belt limit roller; 2-8. Inlet pipe electric valve; 2-9. Argon inlet pipe; 2-10. Nitrogen inlet pipe; 3. Gas static pressure box of overhead layer; 4. Working cabin barometer; 5. One-way exhaust valve; 6. Electric valve; 7. Working cabin side pipeline pressure gauge; 8. , spare replacement electric valve; 9, airbag pressure gauge of air storage tank; 10, airbag in air storage tank; 11, air storage tank; 12, air storage tank barometer; 13, air inlet one-way electric valve of air storage tank; 14, air exhaust one-way electric valve of air storage tank; 15, energy consumption gas valve of air storage tank; 16, electric valve of compressor exhaust pipe; 17, gas compressor; 18, air pressure gauge on the side of air storage tank; 19, electric valve on the side of air storage tank; 20, air pressure gauge on the side of working tank; 21, electric valve on working tank; 22, air pressure gauge on the outlet of gas compressor; 23, venting of gas compressor Side barometer; 24, gas compressor nitrogen pipeline electric valve; 25, gas compressor nitrogen pipeline barometer; 26, compressor nitrogen pipeline vaporizer outlet electric valve; 27, compressor nitrogen pipeline vaporizer; 28, compressor nitrogen pipeline liquid nitrogen pressure gauge; 29, liquid nitrogen storage tank; 30, first argon pipeline electric valve; 31, argon pipeline barometer; 32, argon second pipeline electric valve; 33, argon vaporizer; 34, liquid argon pressure gauge; 35, liquid argon storage tank; 36, vent pipe one-way valve; 37, oxygen content sensor device; 38. Nitrogen content sensor; 39. Argon content sensor; 40. Thermal processing equipment; 41. Working surface gas sensor; 42. Thermal oil storage tank; 42-1. Thermal oil to compressor side return oil pipeline; 42-2. Thermal oil to compressor side supply oil pipeline; 42-3. Thermal oil to vaporizer side return oil pipeline; 42-4. Thermal oil to vaporizer side supply oil pipeline; 42-5. Thermal oil to compressor side circulation pump; 42-6. Thermal oil to vaporizer side circulation pump; 42-7. Thermal oil inner oil tank. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] like Figure 1-5 As shown, an embodiment of the present invention provides an inert gas environment replacement method for magnesium hot processing and a combined airbag group structure, including an argon-filled inert gas working cabin 1, an overhead gas static pressure box 3 is arranged at the bottom of the argon-filled inert gas working cabin 1, a hot processing process equipment 40 is placed on the upper end of the overhead gas static pressure box 3, a working surface gas sensor 41 is arranged inside the argon-filled inert gas working cabin 1, an upper pipeline is fixedly connected to the outside of the argon-filled inert gas working cabin 1, an exhaust pipeline is arranged on the outer surface of the upper pipeline, a one-way exhaust valve 5 is arranged outside the exhaust pipeline, a working cabin electric valve 21 is arranged outside the upper pipeline, a spare replacement electric valve 8 is arranged outside the upper pipeline, a gas storage cabin 11 is fixedly connected to the front end of the upper pipeline, and a gas storage cabin airbag 10 is arranged inside the gas storage cabin 11.

[0027] The outer surface of the argon-filled inert gas working cabin 1 is fixedly connected to a lower pipeline, and a compressor exhaust pipe electric valve 16 is arranged outside the lower pipeline. The lower pipeline is connected to a gas compressor 17 and connected from the other end to an electric valve 19 on the gas storage cabin side and is fixedly connected to the gas storage cabin 11. A working cabin side barometer 20 is arranged on the outer surface of the upper pipeline, and a gas storage cabin barometer 12, a gas storage cabin air intake one-way electric valve 13, and a gas storage cabin exhaust one-way electric valve 14 are arranged on the upper end of the gas storage cabin 11. The energy-consuming gas valve 15 of the cabin is provided, and a vent pipe is provided at the side end of the gas compressor 17, and a vent pipe non-return valve 36 is provided at the front end of the vent pipe. A gas compressor vent side barometer 23 is provided outside the vent pipe. A nitrogen pipeline is provided at the front end of the gas compressor 17, and a gas compressor nitrogen pipeline electric valve 24 is provided outside the nitrogen pipeline. A compressor nitrogen pipeline vaporizer outlet electric valve 26 is provided outside the nitrogen pipeline. The nitrogen pipeline is connected to the compressor nitrogen pipeline vaporizer 27 from another One end is connected to the liquid nitrogen storage tank 29, an argon pipeline is arranged at the front end of the gas compressor 17, a first argon pipeline electric valve 30 is arranged outside the argon pipeline, a second argon pipeline electric valve 32 is arranged outside the argon pipeline, the argon pipeline is connected to the argon vaporizer 33 and connected to the liquid argon storage tank 35 from the other end, an argon pipeline barometer 31 and a liquid argon pressure gauge 34 are arranged outside the argon pipeline, an electric valve 6 is arranged outside the exhaust pipeline, an oxygen content sensor 37, a nitrogen content sensor 38 and an argon content sensor 39 are arranged at the front end of the exhaust pipeline, a working cabin barometer 4, a working cabin side pipeline barometer 7, and a gas storage cabin airbag pressure gauge 9 are fixedly connected to the outer surface of the upper pipeline, a gas compressor outlet barometer 22 is fixedly connected to the outer surface of the lower pipeline, a gas storage cabin side barometer 18 is fixedly connected to the outer surface of the lower pipeline, and a gas compressor nitrogen pipeline barometer 25 and a compressor nitrogen pipeline liquid nitrogen pressure gauge 28 are arranged outside the nitrogen pipeline.

[0028] The combined airbag 2 includes a guide rod 2-1, an internal airbag 2-2, a limit block 2-3 on the upper part of the guide rod, a counterweight plate 2-4 on the top plate of the airbag, a barometer 2-5, an air-connecting pipe electric valve 2-6, a limit roller 2-7, an intake pipe electric valve 2-8, an argon intake pipe 2-9 and a nitrogen intake pipe 2-10. A gas compressor nitrogen pipeline barometer 25 and a compressor nitrogen pipeline liquid nitrogen pressure gauge 28 are arranged on the outside of the nitrogen pipeline.

[0029] The heat transfer oil storage tank 42 includes a heat transfer oil to compressor side return oil pipeline 42-1, a heat transfer oil to compressor side supply oil pipeline 42-2, a heat transfer oil to vaporizer side return oil pipeline 42-3, a heat transfer oil to vaporizer side supply oil pipeline 42-4, a heat transfer oil to compressor side circulation pump 42-5, a heat transfer oil to vaporizer side circulation pump 42-6 and a heat transfer oil inner layer oil tank 42-7. The rear end of the heat transfer oil inner layer oil tank 42-7 is fixedly connected to the heat transfer oil to compressor side return oil pipeline 42-1. Then, the front end of the hot oil inner layer oil tank 42-7 is fixedly connected to the heat transfer oil to vaporizer side oil supply pipeline 42-4, the front end of the hot oil inner layer oil tank 42-7 is fixedly connected to the heat transfer oil to vaporizer side oil return pipeline 42-3, the front end of the heat transfer oil to vaporizer side oil return pipeline 42-3 is connected to the heat transfer oil to vaporizer side circulation pump 42-6, and the rear end of the heat transfer oil inner layer oil tank 42-7 is connected to the rear end of the heat transfer oil to compressor side oil supply pipeline 42-2 and the heat transfer oil to compressor side circulation pump 42-5.

[0030] An inert gas environment replacement method for hot processing of magnesium, wherein the interior of an argon-filled inert gas working chamber 1 is an inert gas space for hot processing of magnesium and similar light metals, and has a rigid enclosure structure. The interior is a constant volume space, and the airbag is used to inject argon into the airbag during the argon replacement air stage before production to fill the space of non-process equipment and reduce the overall replacement volume. Multiple airbag groups are interconnected and combined through gas-connected pipe electric valves 2-6. After reaching the set air pressure, the gas supply is stopped, and the relevant valve groups are closed to maintain constant pressure and airtightness. During the replacement process, when the working surface gas sensor 41 detects that the concentrations of oxygen, nitrogen, and argon meet the process requirements, the hot processing process equipment 40 can be started to start heating, and the nitrogen and argon gases are controlled at a reaction temperature minus 50°C. Ensure that magnesium does not react with the gas during the first heating process. Since the thermal processing equipment 40 itself has thermal insulation measures, the temperature outside the equipment is usually below 80°C. Therefore, in the first heating stage, the displaced gas adds rising kinetic energy on the outer wall of the furnace body under the action of thermal convection and thermal radiation, which will further improve the replacement efficiency. When the replacement is completed, the high-temperature magnesium does not react with argon during the second stage of melting or 3D printing, and the argon is finally recovered.

[0031] Working principle: The interior of the argon-filled inert gas working cabin 1 is an inert gas space for hot processing of magnesium and similar light metals. It has a rigid enclosure structure and a fixed-volume space inside. The working cabin is an air environment when not working, which is convenient for personnel to enter to adjust and replace equipment. During working, it is an inert gas environment. Typical gases are nitrogen and argon. The internal bottom overhead gas static pressure box 3 is a structure for bottom replacement air supply of replacement gas. Argon or nitrogen enters from the bottom and is sent upward from the opening in the floor. The air in the cabin is discharged in a form similar to "piston wind".

[0032] The combined airbag 2 can be flexibly combined according to the characteristics of specific projects. The limiting rollers 2-7 can facilitate the transportation and fixation of the airbag, and the overhead rollers can facilitate the argon gas in the gas static pressure box 3 at the bottom overhead layer to replace the overall space. The airbag is used to inject argon gas into the airbag during the argon gas replacement air stage before production to fill the space of non-process equipment and reduce the overall replacement volume. The guide rod 2-1 is used to control the vertical movement trajectory of the airbag during the inflation and deflation stages of the airbag. The specific design can be further deepened according to the height and size of the airbag. The internal airbag 2-2 is a flexible closed space for containing gas. Argon and nitrogen can enter the airbag from the argon inlet pipe 2-9 or the nitrogen inlet pipe 2-10, but the argon inlet pipe 2-9 or the nitrogen inlet pipe 2-10 are interlocked, that is, when one of the valves is working, the other valve must be closed. Moreover, the inlet pipe electric valve 2-8 controls the inflation of the airbag and shuts off the seal after it is filled with gas.

[0033] Multiple airbag groups are interconnected and combined through the air-connecting pipe electric valve 2-6. After the airtight door of the working cabin is closed, the airbag inflates and rises to first overcome the counterweight plate 2-4 on the top of the airbag, until the airbag expands and increases in volume to reach the limit block 2-3 on the upper part of the rod, and then the internal air pressure begins to increase. After reaching the set air pressure, the air supply is stopped.

[0034] When the combined airbag 2 is inflated at a constant volume, the air in the cabin is discharged to the outside through the one-way exhaust valve 5 and the opened electric valve 6. At this time, the electric valve 21 on the working cabin side remains closed, and the air is directly discharged to the outside. When the combined airbag 2 reaches the set air pressure and volume, the relevant valve group is closed to maintain constant pressure and airtightness.

[0035] Keep the one-way exhaust valve 5 and the opened electric valve 6 in the open state. At this time, open the gas compressor 17, the gas compressor nitrogen pipeline electric valve 24, the compressor nitrogen pipeline vaporizer outlet electric valve 26 and the liquid nitrogen storage tank 29 to achieve nitrogen replacement of air. Keep the one-way exhaust valve 5 and the opened electric valve 6. At this time, open the argon pipeline electric valve 30, the argon pipeline electric valve 32, the argon vaporizer 32 and the liquid argon storage tank 35. Argon enters the overhead gas static pressure box 3 from the gas compressor 17 and the compressor exhaust pipe electric valve 16, and then flows upward from the bottom Start replacing the internal space of the argon-filled inert gas working chamber 1 until the parameters of the top exhaust oxygen content sensor 37, nitrogen content sensor 38, and argon content sensor 39 reach the process requirements, then open the gas-connected pipe electric valve 2-6, and release the pure argon in the airbag group at the bottom under the gravity of the counterweight plate 2-4 on the top of the airbag. At the same time, the airbag shrinks to achieve partial pure argon replacement of the airbag volume. After completion, close the one-way exhaust valve 5 and the opened electric valve 6. After the replacement is completed, close the gas-connected pipe electric valve 2-6 to prepare for the argon recovery process.

[0036] During the replacement process, when the working surface gas sensor 41 detects that the concentrations of oxygen, nitrogen and argon meet the process requirements, the heat treatment process equipment 40 can be started to heat, and the nitrogen and argon gases are controlled at a reaction temperature minus 50°C. To ensure that magnesium does not react with the gas during the first heating process, the working surface gas sensor 41 can be hoisted or mounted on a bracket. Since the heat treatment process equipment 40 itself has heat insulation measures, the temperature outside the equipment is usually below 80°C. Therefore, in the first heating stage, the replaced gas is superimposed on the outer wall of the furnace body under the action of thermal convection and thermal radiation. The rising kinetic energy will further improve the replacement efficiency.

[0037] When the replacement is completed, the high-temperature magnesium does not react with argon during the second stage of melting or 3D printing.

[0038] After the production is completed, the gas compressor 17, the one-way valve 36 of the vent pipe, the electric valve 19 on the gas storage tank side, and the one-way electric valve 13 of the gas storage tank intake are turned on to start pumping the airbag 10 in the gas storage tank to an empty and contracted state. After completion, the gas compressor 17, the one-way valve 36 of the vent pipe, the electric valve 19 on the gas storage tank side, and the one-way electric valve 13 of the gas storage tank intake are turned off.

[0039] During the argon recovery stage, the gas compressor 17 is used to inhale air through the gas compressor venting side barometer 23 or a small air compressor is separately set up to inject compressed air into the combined airbag 2. The injection process is consistent with the aforementioned inflation process. During the injection process, the working cabin side electric valve 21, the spare replacement electric valve 8, and the gas storage cabin exhaust one-way electric valve 14 are opened, and the combined airbag is inflated 2 to pressurize the inert gas in the working cabin into the airbag 10 in the gas storage cabin. At this time, the recovered argon is all high-purity argon.

[0040] When the combined airbag 2 is full, the argon recovery is completed, and the working cabin side electric valve 21, the standby replacement electric valve 8, and the gas storage cabin exhaust one-way electric valve 14 are closed.

[0041] Open the working cabin door, and the small amount of remaining argon gas diffuses through natural ventilation. After diffusion, the combined airbag 2 is exhausted. The exhaust method is the same as the aforementioned argon method. The recovered argon gas is stored in the airbag 10 in the air storage cabin of the air storage cabin 11. Due to the change of sunlight and temperature, the airbag will shrink or expand in volume. The corresponding air pressure change in the cavity between the airbags 10 in the air storage cabin of the air storage cabin 11 can be monitored by the air storage cabin barometer 12. It can be seen that when it is necessary to supplement air to maintain the pressure, the air storage cabin intake one-way electric valve 13 or the air storage cabin exhaust one-way electric valve 14 is opened according to the pressure difference. These two valves are also interlocked. When the air pressure in the cavity between the airbags 10 in the air storage cabin of the air storage cabin 11 is too high due to the expansion of high-temperature gas in summer, the pressure can be adjusted by the air storage cabin energy-consuming air valve 15. The air storage cabin energy-consuming air valve 15 has its own weight plus spring resistance inside, which is used to consume air pressure to do work and reduce the pressure difference.

[0042] Since the gas compressor 17 is a common air compressor-like device, a large amount of heat is generated while compressing the gas to do work, which needs to be dissipated. At the same time, the argon vaporizer 33 compressor nitrogen pipeline vaporizer 27 needs to absorb heat when working, and frost often forms on the vaporizer surface and the attached pipeline. Therefore, in order to reduce energy consumption and improve efficiency when working, a heat transfer oil storage tank and its attached structure with a double-layer structure are designed. The heat transfer oil storage tank 42 is used to buffer and store heat to solve the time difference between the time period and intensity distribution of heat generation and heat demand. The specific storage tank size is determined by the specific engineering design. Although the density difference will drive the flow of heat transfer oil, the engineering still needs to consider the circulation pump to ensure that the fluidity is controllable. The heat transfer oil to the compressor side circulation pump 42-5 is installed on the heat transfer oil to the compressor side oil supply pipeline 42-2, which is used to drive the heat transfer oil flow on the compressor side. After the heat transfer oil absorbs heat, it flows from the heat transfer oil to the compressor side return oil pipeline 42-1 to the outer structure space of the heat transfer oil storage tank. The heat transfer oil to vaporizer side circulation pump 42-6 is installed on the heat transfer oil to vaporizer side return oil pipeline 42-3, driving the heat transfer oil inner oil tank 42-7 to flow the heat transfer oil from the heat transfer oil to vaporizer side supply pipeline 42-4 to the compressor nitrogen pipeline vaporizer 27 or argon vaporizer 33 for heat exchange, and then flows back to the heat transfer oil inner oil tank 42-7 after heat exchange.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined airbag assembly structure for magnesium hot working, characterized in that: include: An argon-filled inert gas working cabin (1), wherein an overhead gas static pressure box (3) is arranged at the bottom of the argon-filled inert gas working cabin (1), a thermal processing process equipment (40) is placed at the upper end of the overhead gas static pressure box (3), a working surface gas sensor (41) is arranged inside the argon-filled inert gas working cabin (1), an upper pipe is fixedly connected to the outside of the argon-filled inert gas working cabin (1), an exhaust pipeline is arranged on the outer surface of the upper pipe, a one-way exhaust valve (5) is arranged outside the exhaust pipeline, a working cabin electric valve (21) is arranged outside the upper pipe, a spare replacement electric valve (8) is arranged outside the upper pipe, a front end of the upper pipe is fixedly connected to a gas storage cabin (11), and a gas storage cabin inner airbag (10) is arranged inside the gas storage cabin (11); The outer surface of the argon-filled inert gas working cabin (1) is fixedly connected to a lower pipeline, and a compressor exhaust pipe electric valve (16) is arranged outside the lower pipeline. The lower pipeline is connected to a gas compressor (17) and is connected from the other end to a gas storage tank side electric valve (19) and is fixedly connected to the gas storage tank (11). The outer surface of the upper pipeline is provided with a working cabin side barometer (20). The upper end of the gas storage tank (11) is provided with a gas storage tank barometer (12), a gas storage tank air intake one-way electric valve (13), a gas storage tank exhaust one-way electric valve (14) and a gas storage tank energy consumption gas valve (15). The side end of the gas compressor (17) is provided with a vent pipe, and the front end of the vent pipe is provided with a vent pipe one-way valve (36). The outside of the vent pipe is provided with a gas compressor vent side barometer (20). 3), a nitrogen pipeline is provided at the front end of the gas compressor (17), a gas compressor nitrogen pipeline electric valve (24) is provided outside the nitrogen pipeline, a compressor nitrogen pipeline vaporizer outlet electric valve (26) is provided outside the nitrogen pipeline, the nitrogen pipeline is connected to the compressor nitrogen pipeline vaporizer (27) and is connected to a liquid nitrogen storage tank (29) from the other end, an argon pipeline is provided at the front end of the gas compressor (17), a first argon pipeline electric valve (30) is provided outside the argon pipeline, a second argon pipeline electric valve (32) is provided outside the argon pipeline, the argon pipeline is connected to the argon vaporizer (33) and is connected to a liquid argon storage tank (35) from the other end, and an argon pipeline barometer (31) and a liquid argon pressure gauge (34) are provided outside the argon pipeline; A combined airbag (2), the combined airbag (2) comprising a guide rod (2-1), an internal airbag (2-2), a limit block (2-3) on the upper portion of the guide rod, a counterweight plate (2-4) on the top plate of the airbag, a barometer (2-5), an air-connecting pipe electric valve (2-6), a limit roller (2-7), an air intake pipe electric valve (2-8), an argon air intake pipe (2-9) and a nitrogen air intake pipe (2-10); A heat transfer oil storage tank (42), the heat transfer oil storage tank (42) comprising a heat transfer oil to compressor side return oil pipeline (42-1), a heat transfer oil to compressor side supply oil pipeline (42-2), a heat transfer oil to vaporizer side return oil pipeline (42-3), a heat transfer oil to vaporizer side supply oil pipeline (42-4), a heat transfer oil to compressor side circulation pump (42-5), a heat transfer oil to vaporizer side circulation pump (42-6) and a heat transfer oil inner layer oil tank (42-7).

2. The combined airbag assembly structure for hot working of magnesium according to claim 1, characterized in that: An electric valve (6) is arranged outside the exhaust pipe, and an oxygen content sensor (37), a nitrogen content sensor (38) and an argon content sensor (39) are arranged at the front end of the exhaust pipe.

3. The combined airbag assembly structure for hot working of magnesium according to claim 1, characterized in that: The outer surface of the upper pipeline is fixedly connected with a working cabin air pressure gauge (4), a working cabin side pipeline air pressure gauge (7), and an air storage cabin air bag pressure gauge (9).

4. The combined airbag assembly structure for hot working of magnesium according to claim 1, characterized in that: The outer surface of the lower pipeline is fixedly connected to a gas compressor outlet pressure gauge (22), and the outer surface of the lower pipeline is fixedly connected to a gas storage tank side pressure gauge (18).

5. The combined airbag assembly structure for hot working of magnesium according to claim 1, characterized in that: A gas compressor nitrogen pipeline barometer (25) and a compressor nitrogen pipeline liquid nitrogen pressure gauge (28) are arranged outside the nitrogen pipeline.

6. The combined airbag assembly structure for hot working of magnesium according to claim 1, characterized in that: The interior of the internal airbag (2-2) contacts the guide rod (2-1), the side inner wall of the internal airbag (2-2) is fixedly connected to the upper limit block (2-3) of the guide rod, the inner wall of the internal airbag (2-2) contacts the airbag top plate counterweight plate (2-4), the lower surface of the internal airbag (2-2) is fixedly connected to the limit roller (2-7), the front end of the internal airbag (2-2) is fixedly connected to an air connection pipe, the outside of the air connection pipe is fixedly connected to an air connection pipe electric valve (2-6), the outside of the air connection pipe is fixedly connected to a barometer (2-5), the rear end of the internal airbag (2-2) is fixedly connected to an air intake pipe, the outside of the air intake pipe is fixedly connected to an air intake pipe electric valve (2-8), and the rear end of the air intake pipe is fixedly connected to an argon air intake pipe (2-9) and a nitrogen air intake pipe (2-10), respectively.

7. The combined airbag assembly structure for hot working of magnesium according to claim 1, characterized in that: The rear end of the heat transfer oil inner layer oil tank (42-7) is fixedly connected to the heat transfer oil to compressor side return oil pipeline (42-1), the front end of the heat transfer oil inner layer oil tank (42-7) is fixedly connected to the heat transfer oil to vaporizer side oil supply pipeline (42-4), the front end of the heat transfer oil inner layer oil tank (42-7) is fixedly connected to the heat transfer oil to vaporizer side return oil pipeline (42-3), the front end of the heat transfer oil to vaporizer side return oil pipeline (42-3) is connected to the heat transfer oil to vaporizer side circulation pump (42-6), and the rear end of the heat transfer oil inner layer oil tank (42-7) is connected to the rear end of the heat transfer oil to compressor side supply oil pipeline (42-2) and the heat transfer oil to compressor side circulation pump (42-5).

8. A method for replacing an inert gas environment for hot working of magnesium, based on the combined airbag assembly structure for hot working of magnesium according to any one of claims 1 to 7, characterized in that: The interior of the argon-filled inert gas working chamber (1) is an inert gas space for hot processing of magnesium and similar light metals. It has a rigid enclosure structure and a constant volume space. The airbag is used to inject argon into the airbag during the argon replacement air stage before production to fill the space of non-process equipment and reduce the overall replacement volume. Multiple airbag groups are interconnected and combined through air-connected pipe electric valves (2-6). After reaching the set air pressure, the gas supply is stopped and the relevant valve groups are closed to maintain constant pressure and airtightness. During the replacement process, when nitrogen or argon reaches the working surface gas sensor (41) and the oxygen, nitrogen and argon concentrations meet the process requirements in real time, the hot processing process equipment (40) can be started to start heating. The nitrogen and argon gases are controlled at a reaction temperature minus 50°C. Ensure that magnesium does not react with gas during the first heating process. Since the heat processing equipment (40) itself has heat insulation measures, the temperature outside the equipment is usually below 80°C. Therefore, in the first heating stage, the displaced gas adds rising kinetic energy on the outer wall of the furnace body under the action of thermal convection and thermal radiation, which will further improve the replacement efficiency. When the replacement is completed, the high-temperature magnesium does not react with argon during the second stage of melting or 3D printing, and the argon is finally recovered.

Images