CN110976894A - Aluminum-based alloy powder vacuum gas atomization production system - Google Patents
Aluminum-based alloy powder vacuum gas atomization production system Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 77
- 239000000956 alloy Substances 0.000 title claims abstract description 65
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 62
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 54
- 238000009689 gas atomisation Methods 0.000 title claims abstract description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 283
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 134
- 238000011084 recovery Methods 0.000 claims abstract description 36
- 238000003723 Smelting Methods 0.000 claims abstract description 33
- 239000000428 dust Substances 0.000 claims abstract description 29
- 238000000889 atomisation Methods 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 238000003860 storage Methods 0.000 claims description 147
- 239000007789 gas Substances 0.000 claims description 102
- 230000001502 supplementing effect Effects 0.000 claims description 53
- 230000001105 regulatory effect Effects 0.000 claims description 17
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 15
- 238000004880 explosion Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 238000009461 vacuum packaging Methods 0.000 claims description 5
- 238000013022 venting Methods 0.000 claims 2
- 239000004411 aluminium Substances 0.000 claims 1
- 239000011261 inert gas Substances 0.000 abstract description 26
- 239000000654 additive Substances 0.000 abstract description 17
- 230000000996 additive effect Effects 0.000 abstract description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 13
- 239000001301 oxygen Substances 0.000 abstract description 13
- 229910052760 oxygen Inorganic materials 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 description 7
- 239000013589 supplement Substances 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0844—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid in controlled atmosphere
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2201/00—Treatment under specific atmosphere
- B22F2201/02—Nitrogen
Abstract
The invention provides an aluminum-based alloy powder vacuum gas atomization production system, which comprises a smelting atomization device, a vacuum control device, an air pressure balance system, a grading system and a dust removal recovery device, wherein high-purity liquid nitrogen is used as an inert gas source, the purity of the high-purity liquid nitrogen can reach 99.999%, the oxygen content of aluminum-based alloy powder produced by high-purity liquid nitrogen atomization is less than or equal to 100PPM, the oxygen content is low, and the requirement of additive manufacturing can be completely met, meanwhile, a vacuum pump and a roots pump are matched with each other to realize vacuum, the vacuum degree can reach 0.1Pa, so that the sphericity and the fluidity of the atomized aluminum-based alloy powder are effectively improved, a closed-cycle inert gas circulation system is designed, the recovery and utilization of inert gas and the pressure balance in the system are realized, the production cost is reduced.
Description
The technical field is as follows:
the invention belongs to the technical field of production and manufacturing of alloy powder, and particularly relates to a vacuum gas atomization production system for aluminum-based alloy powder.
Background art:
at present, additive manufacturing technologies represented by 3D printing are more and more mature, but the additive manufacturing technologies have higher requirements on raw materials, so that in the case of performing additive manufacturing by using alloy powder, the alloy powder is required to meet the performances of low oxygen content, high sphericity, good fluidity and the like, and the fluidity of the powder directly affects the powder laying effect, the forming process and the quality of an additive manufactured part in the laser additive manufacturing process. The fluidity of the powder is related to the particle size, appearance, apparent density, Hall flow rate and other characteristics of the powder. The higher the sphericity of the powder, the more uniform the particle size distribution, and the smaller the hall flow rate, the better the flowability of the powder. The requirement of powder granularity is related to the additive manufacturing technology, and for the laser additive manufacturing technology based on the powder-laying type powder bed, the powder granularity is preferably in the range of 15-53 mu m. The powder has high oxygen content, the higher the surface activity, the poorer the wettability and the more serious the spheroidization, which results in poor melting effect.
The alloy powder produced by vacuum atomization is popular for additive manufacturing due to the advantages of low oxygen, high sphericity, good fluidity and the like, the additive manufacturing technology is proposed as a national strategy at present, with the continuous development of the additive manufacturing technology, the alloy powder produced by vacuum atomization cannot meet the requirements of additive manufacturing on the sphericity and fluidity of the alloy powder, and the problem of raw materials severely restricts the development of the additive manufacturing technology in China.
Taking the production of aluminum-based alloy powder by vacuum gas atomization as an example, the main process flow of the method comprises aluminum-based alloy vacuum melting, nitrogen or argon atomization powder preparation, powder collection and gas evacuation. The nitrogen or argon is inert gas, and is used as protective gas in atomization powder preparation, the purity of the inert gas directly influences the oxygen content of the aluminum-based alloy powder, the vacuum degree of the atomization powder preparation directly influences the sphericity and the fluidity of the aluminum-based alloy powder, and the higher the vacuum degree, the better the sphericity and the fluidity of the produced aluminum-based alloy powder are. At present, most of nitrogen gas adopted by aluminum-based alloy powder production enterprises is produced by a nitrogen making machine, the nitrogen making machine produces nitrogen gas, the nitrogen gas is low in cost, but the purity of the nitrogen gas produced by the nitrogen making machine can only reach 99.99% to the maximum extent, the oxygen content of the aluminum-based alloy powder produced by vacuum atomization of the nitrogen gas with the purity is about 800PPM, the requirement of additive manufacturing cannot be met, in addition, the nitrogen gas is directly discharged after the powder is collected, the nitrogen gas utilization efficiency is low, the production cost of the alloy powder produced by vacuum gas atomization is difficult to reduce, and a large amount of inert protective gas is discharged to the atmosphere and is not beneficial to atmospheric environment protection.
In addition, the existing aluminum-based alloy powder production enterprises adopt the vacuum pump to pump away air in the production system and keep the vacuum of the production system, but the vacuum degree which can be achieved by the vacuum pump is not high, and the requirements of atomization production cannot be met. The produced aluminum-based alloy powder has poor sphericity and fluidity and cannot meet the requirement of additive manufacturing.
Disclosure of Invention
In summary, in order to overcome the defects of the prior art, the invention provides a vacuum gas atomization production system for aluminum-based alloy powder, which adopts high-purity liquid nitrogen as an inert gas source, wherein the purity of the high-purity liquid nitrogen can reach 99.999%, the oxygen content of the aluminum-based alloy powder produced by high-purity liquid nitrogen atomization is less than or equal to 100PPM, the oxygen content is low, the material increase manufacturing requirements can be completely met, meanwhile, a vacuum pump and a roots pump are matched with each other to realize vacuum, the vacuum degree can reach 0.1Pa, so that the sphericity and the fluidity of the atomized aluminum-based alloy powder are effectively improved, a closed-cycle inert gas circulation system is designed, the recycling of inert gas and the pressure balance in the system are realized, the production cost is reduced, and the production efficiency is improved.
In order to solve the technical problem, the technical scheme of the invention is realized as follows:
an aluminum-based alloy powder vacuum gas atomization production system, wherein: including smelting atomizing device, vacuum control device, atmospheric pressure balanced system, grading system and dust removal recovery unit, smelting atomizing device include smelting furnace, atomizing nozzle and atomizer chamber, the discharge gate of smelting furnace pass through atomizing nozzle intercommunication atomizer chamber, the gas outlet of air inlet intercommunication atmospheric pressure balanced system of atomizing nozzle, the smelting furnace pass through the air inlet of pipe connection vacuum control device, the air inlet of pipe connection vacuum control device that passes through of atomizer chamber, the discharge gate of atomizer chamber intercommunication grading system's feed inlet, grading system's discharge gate intercommunication receiving tank and vacuum packaging device, grading system's air outlet intercommunication dust removal recovery unit's air intake, dust removal recovery unit's air outlet intercommunication atmospheric pressure balanced system, atmospheric pressure balanced system include high-purity liquid nitrogen tank, dust removal recovery unit's air intake, The pressure balance storage tank comprises a tank body and an air inlet, an air outlet, a safety port, an automatic exhaust port, an air supplement port, a recovery port and an explosion relief port which are arranged on the tank body, the explosion relief port of the pressure balance storage tank is provided with an explosion relief valve, the automatic exhaust port of the pressure balance storage tank is provided with an automatic exhaust valve, the safety port of the pressure balance storage tank is provided with a safety valve, the air outlet of the pressure balance storage tank is communicated with the air inlet of the medium pressure nitrogen storage tank through a pressurization pipeline, and the air outlet of the medium pressure nitrogen storage tank is communicated with the air inlet of the pressure regulation valve, the pipeline of gas outlet and pressure regulating valve's air inlet intercommunication of middling pressure nitrogen gas storage tank on be provided with the control valve, pressure regulating valve's gas outlet intercommunication smelt atomizing device's atomizing nozzle's air inlet, the recovery mouth of pressure balance storage tank intercommunication dust removal recovery unit's air outlet, the pressure boost pipeline including series connection's high efficiency filter, cooler, gas filter and nitrogen compressor in proper order.
The technical scheme of the invention can also be realized as follows: the vacuum control device comprises a vacuum pump, a roots pump and a vacuum pipeline, wherein an air inlet of the vacuum pump and an air inlet of the roots pump are respectively communicated with the vacuum pipeline, the vacuum pipeline is respectively connected with the smelting furnace and the atomizing chamber through a vacuum branch pipe, a vacuum smelting valve is arranged on the vacuum branch pipe of the vacuum pipeline connected with the smelting furnace, and a vacuum atomizing valve is arranged on the vacuum branch pipe of the vacuum pipeline connected with the atomizing chamber.
The technical scheme of the invention can also be realized as follows: the grading system is a plurality of turbine graders which are sequentially arranged in series.
The technical scheme of the invention can also be realized as follows: the dust removal recovery unit include dust remover, draught fan, retrieve check valve and recovery pipeline, the air intake connection grading system of dust remover the air outlet of last turbine grader, the air outlet of dust remover pass through the recovery mouth of recovery pipeline connection pressure balance storage tank, the recovery pipeline on set gradually the draught fan and retrieve the check valve from the dust remover to the pressure balance storage tank.
The technical scheme of the invention can also be realized as follows: the air supply pipeline comprises an air supply pipeline, a manual air supply valve, an automatic air supply valve, an air supply check valve and an air supply overflow valve, one end of the air supply pipeline is connected with an air outlet of the low-pressure nitrogen storage tank, the other end of the air supply pipeline is connected with an air inlet of the pressure balance storage tank, and the manual air supply valve, the automatic air supply valve, the air supply check valve and the air supply overflow valve are sequentially arranged on the air supply pipeline from the low-pressure nitrogen storage tank to the pressure balance storage tank.
The technical scheme of the invention can also be realized as follows: the medium-pressure nitrogen storage tank is communicated with a gas supplementing port of the pressure balance storage tank through a medium-pressure gas supplementing pipeline, the medium-pressure gas supplementing pipeline comprises a gas outlet communicated with the medium-pressure nitrogen storage tank and a medium-pressure gas supplementing pipeline communicated with the gas supplementing port of the pressure balance storage tank, and the medium-pressure gas supplementing pipeline is sequentially provided with a medium-pressure gas supplementing valve, a Y-shaped filter, a gas supplementing overflow valve and a gas supplementing check valve from the medium-pressure nitrogen storage tank to the pressure balance storage tank.
The technical scheme of the invention can also be realized as follows: the gas outlet of the high-purity liquid nitrogen tank is communicated with the pressure regulating valve through a gas supplementing pipeline, and a gas supplementing pressure relief valve is arranged on the gas supplementing pipeline.
The invention has the beneficial effects that:
1. the invention adopts high-purity liquid nitrogen as an inert gas source, the purity of the high-purity liquid nitrogen can reach 99.999 percent, the oxygen content of the aluminum-based alloy powder produced by atomizing the high-purity liquid nitrogen is less than or equal to 100PPM, the oxygen content is low, the material additive manufacturing requirement can be completely met, simultaneously, a vacuum pump and a roots pump are matched with each other to realize vacuum, the vacuum degree can reach 0.1Pa, thereby effectively improving the sphericity and the fluidity of the atomized aluminum-based alloy powder, designing a closed cycle inert gas circulation system, realizing the recycling of inert gas and the pressure balance in the system, reducing the production cost and improving the production efficiency.
2. The invention is provided with the pressure balance storage tank, and supplements nitrogen into the pressure balance tank through the air supply pipeline and the medium-pressure air supplement pipeline, so as to keep the inert gas balance of the whole vacuum gas atomization production system, and the aluminum-based alloy powder is produced under the protection of micro-positive pressure inert gas, thereby effectively preventing air from entering the alloy powder production system, and preventing the quality of alloy powder products from being reduced and the production risk from being increased.
3. After the aluminum-based alloy powder produced by gas atomization after vacuum melting is graded by a grading system and vacuum-packed, nitrogen enters a pressure balance storage tank after being dedusted by a deduster under the action of a draught fan, the recovery of the nitrogen is realized, and a closed-cycle nitrogen circulation system is formed, so that the utilization rate of the nitrogen is effectively improved, the production cost of the aluminum-based alloy powder is reduced, and the aluminum-based alloy powder is suitable for large-scale vacuum gas atomization devices.
4. The gas outlet of the high-purity liquid nitrogen tank is communicated with the pressure regulating valve through the gas supplementing pipeline, so that when the pressure of the medium-pressure nitrogen storage tank is insufficient, nitrogen can be directly supplemented to the smelting atomization device and the grading system from the high-purity liquid nitrogen tank, and the smooth production of the aluminum-based alloy powder is ensured.
5. The nitrogen in the pressure balance storage tank is pressurized by a nitrogen compressor through a high-efficiency filter and a cooler, then is sent to a medium-pressure nitrogen storage tank, and then participates in atomization production and classification of the aluminum-based alloy powder. In order to ensure the stable pressure of the aluminum-based alloy powder production and the medium-pressure nitrogen storage tank, the nitrogen flow entering the nitrogen compressor from the pressure balance storage tank must be ensured to be equal to the nitrogen flow participating in the aluminum-based alloy powder production. However, the flow of nitrogen gas participating in atomization production of aluminum-based alloy powder is changed constantly, the flow of gas entering a nitrogen compressor is relatively stable, and in order to ensure balance of the nitrogen gas and the aluminum-based alloy powder, the invention is provided with a medium-pressure gas supplementing pipeline, namely, on the premise of ensuring that the gas yield of the nitrogen compressor is greater than the flow of the atomization gas, the rest part of nitrogen gas is directly supplemented into the pressure balance storage tank through the medium-pressure gas supplementing pipeline, so that the purpose of keeping the pressure of the pressure balance storage tank and the pressure of the medium-pressure nitrogen storage tank balanced is achieved.
6. The vacuum atomization device is simple in structure and convenient to use, can effectively realize vacuum atomization production of aluminum-based alloy powder, simultaneously reduces the oxygen content of the produced aluminum-based alloy powder by improving the purity of nitrogen participating in the production of the aluminum-based alloy powder, achieves the aim of improving the sphericity and the fluidity of the aluminum-based alloy powder by improving the vacuum degree, and provides a material with high sphericity, low oxygen content and good fluidity for additive manufacturing in China.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in figure 1, the aluminum-based alloy powder vacuum gas atomization production system comprises a smelting and atomization device 1, a vacuum control device 2, an air pressure balance system 3, a grading system 4 and a dust removal recovery device 5, wherein the smelting and atomization device 1 comprises a smelting furnace 11, an atomization nozzle 12 and an atomization chamber 13, a discharge port of the smelting furnace 11 is communicated with the atomization chamber 13 through the atomization nozzle 12, an air inlet of the atomization nozzle 12 is communicated with an air outlet of the air pressure balance system 3, an air inlet of the smelting furnace 11 is connected with an air inlet of the vacuum control device 2 through a pipeline, the atomization chamber 13 is connected with an air inlet of the vacuum control device 2 through a pipeline, the vacuum control device 2 comprises a vacuum pump 21, a roots pump 22 and a vacuum pipeline 23, an air inlet of the vacuum pump 21 and an air inlet of the roots pump 22 are respectively communicated with the pipeline 23, the vacuum pipeline 23 is respectively connected with the smelting furnace 11 and the atomization chamber 13, the vacuum branch pipe of the vacuum pipeline 23 connected with the smelting furnace 11 is provided with a vacuum smelting valve 24, and the vacuum branch pipe of the vacuum pipeline 23 connected with the atomizing chamber 13 is provided with a vacuum atomizing valve 25. Discharge gate intercommunication grading system 4's of atomizer chamber 13 feed inlet, grading system 4 be three turbine classifier that arranges in series in proper order, including first turbine classifier 41, second turbine classifier 42 and third turbine classifier 43, first turbine classifier 41's feed inlet pass through the discharge gate of pipe connection atomizer chamber 13, first turbine classifier 41's air outlet connect second turbine classifier 42's feed inlet, second turbine classifier 42's air outlet connect third turbine classifier 43's feed inlet, first turbine classifier 41, second turbine classifier 42 and third turbine classifier 43's discharge gate link respectively and receive material jar and vacuum packaging device, third turbine classifier 43's air outlet intercommunication dust removal recovery unit 5's air intake, dust removal recovery unit 5 include dust remover 51, draught fan 52, fan 52, The air inlet of the dust remover 51 is connected with the air outlet of the third turbine classifier 43, the air outlet of the dust remover 51 is connected with the recovery port of the pressure balance storage tank 33 of the air pressure balance system 3 through the recovery pipeline 54, and the recovery pipeline 54 is sequentially provided with an induced draft fan 52 and a recovery check valve 53 from the dust remover 51 to the pressure balance storage tank 33.
The pressure balance system 3 comprises a high-purity liquid nitrogen tank 31, a low-pressure nitrogen storage tank 32, a pressure balance storage tank 33, a high-efficiency filter 34, a cooler 35, a gas filter 36, a nitrogen compressor 37, a medium-pressure nitrogen storage tank 38 and a pressure regulating valve 39, wherein a gas outlet of the high-purity liquid nitrogen tank 31 is communicated with a gas inlet of the low-pressure nitrogen storage tank 32, a gas outlet of the low-pressure nitrogen storage tank 32 is communicated with a gas inlet of the pressure balance storage tank 33 through a gas supply pipeline, the pressure balance storage tank 33 comprises a tank body and a gas inlet, a gas outlet, a safety port, an automatic exhaust port, a gas supplementing port, a recycling port and an explosion releasing port which are arranged on the tank body, an explosion releasing valve is arranged on the explosion releasing port of the pressure balance storage tank 33, an automatic exhaust valve is arranged on the automatic exhaust port of the pressure balance storage tank 33, a safety valve is arranged on the safety port of the pressure balance The gas outlet of the medium-pressure nitrogen storage tank 38 is communicated with the gas inlet of the pressure regulating valve 39, a control valve 310 is arranged on a pipeline communicated with the gas outlet of the medium-pressure nitrogen storage tank 38 and the gas inlet of the pressure regulating valve 39, the gas outlet of the pressure regulating valve 39 is communicated with the gas inlet of the atomizing nozzle 12 of the smelting and atomizing device 1, the recovery port of the pressure balance storage tank 33 is communicated with the air outlet of the dust removal and recovery device 5, and the pressurization pipeline 311 comprises a high-efficiency filter 34, a cooler 35, a gas filter 36 and a nitrogen compressor 37 which are sequentially connected in series. The air supply pipeline comprises an air supply pipeline 312, a manual air supply valve 313, an automatic air supply valve 314, an air supply one-way valve 315 and an air supply overflow valve 316, one end of the air supply pipeline 312 is connected with an air outlet of the low-pressure nitrogen storage tank 32, the other end of the air supply pipeline is connected with an air inlet of the pressure balance storage tank 33, and the air supply pipeline 312 is sequentially provided with the manual air supply valve 313, the automatic air supply valve 314, the air supply one-way valve 315 and the air supply overflow valve 316 from the low-pressure nitrogen storage tank 32 to the pressure balance storage tank 33.
The medium-pressure nitrogen storage tank 38 is communicated with the gas supplementing opening of the pressure balance storage tank 33 through a medium-pressure gas supplementing pipeline, the medium-pressure gas supplementing pipeline comprises a medium-pressure gas supplementing pipeline 317 communicated with the gas outlet of the medium-pressure nitrogen storage tank 38 and the gas supplementing opening of the pressure balance storage tank 33, and a medium-pressure gas supplementing valve 318, a Y-shaped filter 319, a gas supplementing overflow valve 320 and a gas supplementing check valve 321 are sequentially arranged on the medium-pressure gas supplementing pipeline 317 from the medium-pressure nitrogen storage tank 38 to the pressure balance storage tank 33.
The gas outlet of the high-purity liquid nitrogen tank 31 is communicated with a pressure regulating valve 39 through a gas supplementing pipeline 322, and the gas supplementing pipeline 322 is provided with a gas supplementing pressure relief valve 323.
When starting production, adding aluminum-based alloy into the smelting chamber, starting the vacuum pump 21, opening the vacuum smelting valve 24 and the vacuum atomizing valve 25, closing the pressure regulating valve 39, pumping air in the smelting chamber, the atomizing nozzle 12, the atomizing chamber 13, the grading system 4, the dust collector 51 and the connecting pipeline by the vacuum pump 21, closing the vacuum pump 21 when the pressure in the atomizing chamber 13 reaches 1kPa, opening the roots pump 22, continuing to pump air, and closing the roots pump 22, closing the vacuum smelting valve 24 and the vacuum atomizing valve 25 when the pressure in the atomizing chamber 13 reaches below 0.1 Pa.
High-pressure nitrogen in a high-purity liquid nitrogen tank 31 enters a low-pressure nitrogen storage tank 32, then a manual gas supply valve 313 is manually opened or an automatic gas supply valve 314 is automatically opened, the nitrogen in the low-pressure nitrogen storage tank 32 enters a pressure balance storage tank 33 through a gas supply pipeline 312, then the nitrogen in the pressure balance storage tank 33 enters a nitrogen compressor 37 through a high-efficiency filter 34, a cooler 35 and a gas filter 36 for pressurization, the pressurized nitrogen enters a medium-pressure nitrogen storage tank 38 for storage, a pressure regulating valve 39 is opened to set the nitrogen pressure required by the production of the aluminum-based alloy powder, when the aluminum-based alloy powder is started for production, the nitrogen pressure in the medium-pressure nitrogen storage tank 38 cannot meet the production requirement, at the moment, the control valve 310 is closed, the high-pressure nitrogen in the high-purity liquid nitrogen tank 31 is decompressed to the nitrogen pressure required by the production of the aluminum-based alloy powder through a gas supplementing pipeline 322 and a gas supplementing, the aluminum-based alloy is smelted into molten liquid in a smelting chamber in a vacuum state, the molten liquid is atomized under the protection of nitrogen through an atomizing nozzle 12, atomized aluminum-based alloy powder enters a grading system 4 for grading under the protection of nitrogen, the aluminum-based alloy powder is graded according to the particle size, the aluminum-based alloy powder enters a collecting tank for collection, finally the aluminum-based alloy powder is subjected to vacuum packaging through a vacuum packaging machine, the nitrogen carries a small amount of alloy powder and enters a dust remover 51, the small amount of alloy powder carried in the nitrogen in the dust remover 51 is recovered, and the nitrogen enters a pressure balance storage tank 33 through a recovery pipeline 54 under the action of an induced draft fan.
The nitrogen in the low-pressure nitrogen storage tank 32 enters the pressure balance storage tank 33 through the air supply pipeline, the recovered nitrogen enters the pressure balance storage tank 33 through the recovery pipeline 54, the pressure of the nitrogen in the pressure balance storage tank 33 continuously rises, meanwhile, the nitrogen in the pressure balance storage tank 33 enters the medium-pressure nitrogen storage tank 38 through the pressurization pipeline 311, the pressure of the nitrogen in the medium-pressure nitrogen storage tank 38 increases, when the pressure of the nitrogen in the medium-pressure nitrogen storage tank 38 reaches the set value of the pressure regulating valve 39, the air supplementing pressure relief valve 323 of the air supplementing pipeline 322 is closed, the control valve 310 is opened, the nitrogen in the medium-pressure nitrogen storage tank 38 participates in aluminum-based alloy powder atomization production, and meanwhile, the low-pressure nitrogen storage tank 32 continuously conveys the nitrogen to the pressure balance storage tank 33 until the nitrogen in the pressure balance storage tank 33 and the medium-pressure.
In order to maintain the nitrogen pressure required for the continuous production of the aluminum-based alloy powder, the pressure of a pressure balance storage tank 33, a medium-pressure nitrogen storage tank 38 and a low-pressure nitrogen storage tank 32 of a pressure balance system is set, wherein the upper pressure limit of the pressure balance storage tank 33 is set to 10KPa and the lower pressure limit is set to 5KPa in the embodiment; the upper pressure limit of the medium-pressure nitrogen gas tank 38 is set to 8MPa, the lower pressure limit thereof is set to 6MPa, and the lower pressure limit of the low-pressure nitrogen gas tank 32 is set to 0.3 MPa.
The pressure equalization system works specifically as follows:
when the pressure of the pressure balance storage tank 33 is more than or equal to 10KPa, air does not need to be supplied to the pressure balance storage tank 33.
When the pressure of the pressure balance storage tank 33 is less than 5KPa, inert gas needs to be supplemented to the pressure balance storage tank 33, at this time, if the pressure of the medium pressure nitrogen storage tank 38 is more than 8MPa, the medium pressure gas supplementing pipeline is communicated, the medium pressure gas supplementing valve 318 on the medium pressure gas supplementing pipeline 317 is opened, the inert gas in the medium pressure nitrogen storage tank 38 is filtered by the Y-shaped filter 319, the inert gas flows into the pressure balance storage tank 33 from the gas supplementing port of the pressure balance storage tank 33, the inert gas is supplemented to the pressure balance storage tank 33, in the process, the pressure of the medium pressure nitrogen storage tank 38 is gradually reduced, when the pressure of the medium pressure nitrogen storage tank 38 is lower than 6MPa, the medium pressure gas supplementing valve 318 on the medium pressure gas supplementing pipeline 317 is closed, the automatic gas supply pipeline for communicating the low pressure nitrogen storage tank 32 and the pressure balance storage tank 33 is opened, the low pressure nitrogen storage tank 32 supplements the inert gas to the pressure balance, when the pressure in the medium-pressure nitrogen storage tank 38 exceeds 8MPa, the automatic gas supply pipeline is closed, the medium-pressure gas supplement pipeline is opened, the medium-pressure nitrogen storage tank 38 supplements inert gas to the pressure balance storage tank 33, and the operation is repeated in a circulating mode until the pressure of the pressure balance storage tank 33 is larger than or equal to 10 KPa.
When the pressure of the pressure balance storage tank 33 is less than 5KPa, the inert gas is needed to be supplemented to the pressure balance storage tank 33, at this time, if the pressure of the medium-pressure nitrogen storage tank 38 is less than or equal to 6MPa and the pressure of the low-pressure nitrogen storage tank 32 is more than 0.3MPa, the inert gas is supplemented to the pressure balance storage tank 33 by the low-pressure nitrogen storage tank 32, the inert gas enters the pressure balance storage tank 33, is filtered by a filter, is cooled by a cooler 35, is pressurized by a nitrogen compressor 37, then the inert gas is supplemented to the medium-pressure nitrogen storage tank 38, the pressure in the medium-pressure nitrogen storage tank 38 is gradually increased, when the pressure in the medium-pressure nitrogen storage tank 38 exceeds 8MPa, the medium-pressure gas supplementing pipeline is automatically opened, the medium-pressure nitrogen storage tank 38 supplements the inert gas to the pressure balance storage tank 33, the pressure in the medium-pressure nitrogen storage tank 38 is gradually, the above steps are repeated in a circulating way until the pressure of the pressure balance storage tank 33 is more than or equal to 10 KPa.
When the pressure of the pressure balance storage tank 33 is less than 5KPa, inert gas needs to be supplemented to the pressure balance storage tank 33, at this time, if the pressure of the medium-pressure nitrogen storage tank 38 is less than or equal to 6MPa and the pressure of the low-pressure nitrogen storage tank 32 is less than or equal to 0.3MPa, the medium-pressure gas supplementing pipeline for supplementing gas to the pressure balance storage tank 33 by the medium-pressure nitrogen storage tank 38 is forcibly opened, and the inert gas is supplemented to the pressure balance storage tank 33 by the medium-pressure nitrogen storage tank 38 to maintain the pressure balance.
When all lines are not replenished, the pressure of the pressure balance storage tank 33 is only less than 5KPa, and the replenishing is started.
It should be noted that the above-mentioned embodiments illustrate rather than limit the technical solutions of the present invention, and that equivalent substitutions or other modifications made by those skilled in the art according to the prior art are all included within the scope of the claims of the present invention as long as they do not exceed the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. The utility model provides an aluminium base alloy powder vacuum gas atomization production system which characterized in that: comprises a smelting atomization device (1), a vacuum control device (2), an air pressure balance system (3), a grading system (4) and a dust removal recovery device (5), wherein the smelting atomization device (1) comprises a smelting furnace (11), an atomizing nozzle (12) and an atomizing chamber (13), a discharge hole of the smelting furnace (11) is communicated with the atomizing chamber (13) through the atomizing nozzle (12), an air inlet of the atomizing nozzle (12) is communicated with an air outlet of the air pressure balance system (3), the smelting furnace (11) is connected with an air inlet of the vacuum control device (2) through a pipeline, the atomizing chamber (13) is connected with an air inlet of the vacuum control device (2) through a pipeline, a discharge hole of the atomizing chamber (13) is communicated with a feed inlet of the grading system (4), and a discharge hole of the grading system (4) is communicated with a material receiving tank and a vacuum packaging device, the air outlet of the grading system (4) is communicated with the air inlet of the dedusting recovery device (5), the air outlet of the dedusting recovery device (5) is communicated with the air pressure balance system (3), the air pressure balance system (3) comprises a high-purity liquid nitrogen tank (31), a low-pressure nitrogen storage tank (32), a pressure balance storage tank (33), a high-efficiency filter (34), a cooler (35), a gas filter (36), a nitrogen compressor (37), a medium-pressure nitrogen storage tank (38) and a pressure regulating valve (39), the air outlet of the high-purity liquid nitrogen tank (31) is communicated with the air inlet of the low-pressure nitrogen storage tank (32), the air outlet of the low-pressure nitrogen storage tank (32) is communicated with the air inlet of the pressure balance storage tank (33) through an air supply pipeline, and the pressure balance storage tank (33) comprises a tank body and an air inlet, an air outlet, The pressure balance storage tank (33) is provided with an explosion venting valve on the explosion venting port, an automatic exhaust valve is arranged on an automatic exhaust port of the pressure balance storage tank (33), a safety valve is arranged on a safety port of the pressure balance storage tank (33), a gas outlet of the pressure balance storage tank (33) is communicated with a gas inlet of a medium-pressure nitrogen storage tank (38) through a pressurization pipeline (311), a gas outlet of the medium-pressure nitrogen storage tank (38) is communicated with a gas inlet of a pressure regulating valve (39), a pipeline for communicating the gas outlet of the medium-pressure nitrogen storage tank (38) with the gas inlet of the pressure regulating valve (39) is provided with a control valve (310), a gas outlet of the pressure regulating valve (39) is communicated with a gas inlet of an atomizing nozzle (12) of a smelting atomizing device (1), and a recovery port of the pressure balance storage tank (33) is communicated with a gas outlet of a dust removal and recovery device (5), the pressurizing pipeline (311) comprises a high-efficiency filter (34), a cooler (35), a gas filter (36) and a nitrogen compressor (37) which are sequentially connected in series.
2. The aluminum-based alloy powder vacuum gas atomization production system according to claim 1, characterized in that: the vacuum control device (2) comprises a vacuum pump (21), a roots pump (22) and a vacuum pipeline (23), an air inlet of the vacuum pump (21) and an air inlet of the roots pump (22) are respectively communicated with the vacuum pipeline (23), the vacuum pipeline (23) is respectively connected with the smelting furnace (11) and the atomizing chamber (13) through vacuum branch pipes, a vacuum smelting valve (24) is arranged on the vacuum branch pipe connected with the smelting furnace (11) and the vacuum pipeline (23) and the atomizing chamber (13) are respectively provided with a vacuum atomizing valve (25).
3. The aluminum-based alloy powder vacuum gas atomization production system according to claim 1, characterized in that: the grading system (4) is a plurality of turbine graders which are sequentially arranged in series.
4. The aluminum-based alloy powder vacuum gas atomization production system according to claim 1, characterized in that: dust removal recovery unit (5) include dust remover (51), draught fan (52), retrieve check valve (53) and recovery pipeline (54), the air intake of dust remover (51) connect the air outlet of the last turbine grader of grading system (4), the air outlet of dust remover (51) pass through recovery pipeline (54) and connect the recovery mouth of pressure balance storage tank (33), recovery pipeline (54) on set gradually draught fan (52) and retrieve check valve (53) from dust remover (51) to pressure balance storage tank (33).
5. The aluminum-based alloy powder vacuum gas atomization production system according to claim 1, characterized in that: the air supply line include air supply line (312), manual air feed valve (313), automatic air feed valve (314), air feed check valve (315) and air feed overflow valve (316), air supply line (312) one end be connected with the gas outlet of low pressure nitrogen gas storage tank (32), its other end is connected with the air inlet of pressure balance storage tank (33), air supply line (312) go up and have set gradually manual air feed valve (313), automatic air feed valve (314), air feed check valve (315) and air feed overflow valve (316) from low pressure nitrogen gas storage tank (32) to pressure balance storage tank (33).
6. The aluminum-based alloy powder vacuum gas atomization production system according to claim 1, characterized in that: the medium-pressure nitrogen storage tank (38) is communicated with a gas supplementing opening of the pressure balance storage tank (33) through a medium-pressure gas supplementing pipeline, the medium-pressure gas supplementing pipeline comprises a gas outlet communicated with the medium-pressure nitrogen storage tank (38) and a medium-pressure gas supplementing pipeline (317) of the gas supplementing opening of the pressure balance storage tank (33), and the medium-pressure gas supplementing pipeline (317) is sequentially provided with a medium-pressure gas supplementing valve (318), a Y-shaped filter (319), a gas supplementing overflow valve (320) and a gas supplementing check valve (321) from the medium-pressure nitrogen storage tank (38) to the pressure balance storage tank (33).
7. The aluminum-based alloy powder vacuum gas atomization production system according to claim 1, characterized in that: the gas outlet of the high-purity liquid nitrogen tank (31) is communicated with a pressure regulating valve (39) through a gas supplementing pipeline (322), and the gas supplementing pipeline (322) is provided with a gas supplementing pressure relief valve (323).
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| CN202010003686.5A CN110976894A (en) | 2020-01-03 | 2020-01-03 | Aluminum-based alloy powder vacuum gas atomization production system |
| PCT/CN2020/133871 WO2021135818A1 (en) | 2020-01-03 | 2020-12-04 | Vacuum atomization production system for aluminum-based alloy powder |
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| CN202010003686.5A CN110976894A (en) | 2020-01-03 | 2020-01-03 | Aluminum-based alloy powder vacuum gas atomization production system |
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| CN113042741A (en) * | 2021-03-15 | 2021-06-29 | 中天上材增材制造有限公司 | Preparation method of metal powder or alloy powder for 3D printing and energy-saving automatic system |
| WO2021135818A1 (en) * | 2020-01-03 | 2021-07-08 | 河南省远洋粉体科技股份有限公司 | Vacuum atomization production system for aluminum-based alloy powder |
| CN113828787A (en) * | 2021-09-24 | 2021-12-24 | 湖南奥科新材料科技有限公司 | Gas circulation purification and temperature control method and system for preparing single metal or alloy powder |
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