CN109622962B - Multichannel dual cycle atmosphere protection system - Google Patents
Multichannel dual cycle atmosphere protection system Download PDFInfo
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- CN109622962B CN109622962B CN201811620857.8A CN201811620857A CN109622962B CN 109622962 B CN109622962 B CN 109622962B CN 201811620857 A CN201811620857 A CN 201811620857A CN 109622962 B CN109622962 B CN 109622962B
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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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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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
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/70—Gas flow means
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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
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/90—Means for process control, e.g. cameras or sensors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a multi-channel double-circulation atmosphere protection system, which belongs to the field of metal additive manufacturing, can automatically adjust and maintain the pressure range in a sealed molding cavity, further reduce the oxygen content in the sealed molding cavity, save protective gas and improve the gas replacement speed. The invention comprises a multi-channel gas replacement passage, a gas circulation loop, a gas reduction passage, a vacuumizing passage and a smoke dust filtering loop which are respectively electrically connected with a central control system, and the invention can quickly and economically replace the air in a cavity by pre-vacuumizing, multi-channel gas inlet and single channel gas outlet so as to reduce the water oxygen content; the oxygen content is further reduced by designing a gas circulation passage; smoke dust and particulate matters in the cavity are filtered by designing a smoke dust removal loop; the oxidant is recycled by designing a gas reduction loop; the automatic air supply and the real-time display of physical quantities of all processes are realized by designing a central control system.
Description
Technical Field
The invention belongs to the field of metal additive manufacturing, and particularly relates to a multi-channel double-circulation atmosphere protection system.
Background
The Selective laser Melting (S L M) technology is a new technology which is developed rapidly in the field of near forming and rapid manufacturing in recent years, the Selective laser Melting adopts the basic principle of rapid forming, namely, a three-dimensional solid model of a part is designed on a computer, then the model is sliced and layered through special software to obtain profile data of each section, the data are led into rapid forming equipment, and the equipment controls laser beams to selectively melt metal powder materials of each layer according to the profile data and stack the metal powder materials into three-dimensional metal parts step by step.
Because of the high-temperature oxidability of metal materials and the flammability and explosiveness of fine powder in metal additive manufacturing, inert gas protection is needed in melting and printing metal powder materials in a laser selective area, most of equipment at the present stage adopts argon atmosphere protection, and a plurality of defects and parts needing improvement exist; the oxygen content in the molding cavity is kept at the lowest level of dozens of PPM (standard of protective gas) by always conveying argon protective gas, and cannot be further reduced; gas supplement and replacement are required to be carried out all the time in the printing process, so that the printing cost is increased; in addition, there is a risk of fire and explosion if the powder fumes vaporized or splashed during printing are not filtered and purified.
Disclosure of Invention
The invention provides a multi-channel double-circulation atmosphere protection system which can automatically adjust and maintain the pressure range in a sealed molding cavity, further reduce the oxygen content in the sealed molding cavity, save protective gas and improve the gas replacement speed.
In order to achieve the purpose, the invention adopts the following technical scheme:
a multi-channel dual cycle atmosphere protection system comprising: the multi-channel gas replacement passage, the gas circulation loop, the gas reduction passage, the vacuumizing passage, the smoke dust filtering loop, the sealed molding cavity 4 and the central control system 27 are respectively and electrically connected with the multi-channel gas replacement passage, the gas circulation loop, the gas reduction passage, the vacuumizing passage and the smoke dust filtering loop, the oxygen content analyzer 5, the water content analyzer 6, the pressure sensor 7, the temperature sensor 8, the dust sensor 9 and the overpressure protection valve 10 are installed at the top of the sealed molding cavity 4, and the oxygen content analyzer 5, the water content analyzer 6, the pressure sensor 7, the temperature sensor 8 and the dust sensor 9 are respectively connected with the central control system 27.
In the above system, the central control system 27 is further connected to a solenoid valve a3, a solenoid valve B11, a horizontal three-way solenoid valve 15, a solenoid valve C17, a solenoid valve D20, a solenoid valve E22, and a solenoid valve F24;
the gas replacement path includes: one end of a protective gas cylinder 1 is connected with one end of a pressure reducing valve A2, the other end of the pressure reducing valve A2 is connected with one end of an electromagnetic valve A3, the other end of the electromagnetic valve A3 is connected with one end of a gas pipeline A29, the other end of a gas pipeline A29 is connected with one end of a gas inlet pipeline A30, one end of a gas inlet pipeline B31 and one end of a gas inlet pipeline C32, the other ends of the gas inlet pipeline A30, the gas inlet pipeline B31 and the gas inlet pipeline C32 are respectively connected with the lower part of the side surface of a seal molding cavity 4, one end of a gas outlet pipeline 34 is connected with a horizontal three-way electromagnetic valve 15, the other end of the gas outlet pipeline is connected with a smoke filter B737;
the gas circulation loop comprises: one end of a gas pipeline B35 is connected with a horizontal three-way electromagnetic valve 15, the other end of the gas pipeline B35 is connected with an oxygen suction tank 23, the oxygen suction tank 23 is connected with one end of a gas pipeline C36, the other end of the gas pipeline C36 is connected with one end of an air suction fan A16, the other end of the air suction fan A16 is connected with an electromagnetic valve C17, an electromagnetic valve C17 is respectively connected with an air inlet pipeline A30, an air inlet pipeline B31 and an air inlet pipeline C32, and the air suction fan A16 is connected with a touch screen display 28;
the gas reduction path includes: the reducing gas bottle 26 is connected with one end of a reducing valve B25, one end of a reducing valve B25 is connected with a solenoid valve F24, a solenoid valve F24 is connected with one end of a gas pipeline D37, the other end of the gas pipeline D37 is connected with one end of a solenoid valve E22 through an oxygen absorption tank 23, and the other end of the solenoid valve E22 is connected with a gas pipeline E38;
the vacuum-pumping passage comprises: one end of the gas pipeline 33 is connected with the seal molding cavity 4, the other end of the gas pipeline is connected with the electromagnetic valve B11, the electromagnetic valve B11 is connected with the smoke filter A12, the smoke filter A12 is connected with the vacuum pump 13, the vacuum pump 13 is connected with the central control system 27, and the gas pipeline 33 and the smoke filter B14 are positioned on the same side.
The smoke and dust filtration loop include that gas conduit F39 one end connects sealed shaping cavity 4, 18 one end of desicator is connected to the other end, air exhaust fan B19 one end is connected to the desicator 18 other end, air exhaust fan B19 other end connects solenoid valve D20 one end, smoke and dust filter C21 is connected to the solenoid valve D20 other end, gas conduit G40 one end is connected to smoke and dust filter C21 other end, sealed shaping cavity 4 is connected to the gas conduit G40 other end, air exhaust fan B19 and the touch-sensitive screen display that has human-computer interaction interface 28 are connected.
The shielding gas in the shielding gas cylinder 1 is an inert gas, preferably argon.
The reducing gas in the reducing gas cylinder 26 is a mixed gas of hydrogen and argon.
The filter elements in the soot filter a12 and the soot filter B14 are filter elements having a physical adsorption filtering function.
The desiccant in the dryer 18 is a silica gel desiccant.
The set threshold value of the overpressure protection valve 10 is 10 mbar.
The horizontal three-way electromagnetic valve 15 controls the on-off of two ways by a mechanical structure, needs to be horizontally installed, and is also connected to a central control system 27 to control the on-off of the other two ways.
Has the advantages that: the invention provides a multi-channel double-circulation atmosphere protection system, which has the following advantages compared with the prior art:
1. rapidity of gas replacement: the pressure of the protective gas outlet is controlled by a pressure reducing valve, the protective gas enters from a plurality of different directions of the container to form a rapid flow field to push the air in the sealed molding cavity to the air outlet for discharging, and the method can rapidly reduce the water oxygen content in the cavity to be below 200-500 ppm;
2. and (3) protective gas saving: before gas replacement, the vacuumizing passage is opened to pump the sealed molding cavity to 30-50% of vacuum degree, and then protective gas is introduced to perform gas replacement, so that the protective gas can be saved by 30-50% and the gas replacement speed can be increased;
3. the pressure range in the sealed molding cavity can be automatically adjusted and maintained: the pressure sensor accurately feeds back the pressure in the cavity to the central control system, the central control system controls the on-off of the electromagnetic valve on the gas replacement loop and the on-off of the electromagnetic valve on the vacuumizing loop according to a preset program, the protective gas is used for internally supplementing gas, and the vacuum pump is used for internally exhausting gas, so that the pressure range in the cavity is ensured;
4. further reducing the oxygen content in the sealed molding cavity: the gas in the cavity is pumped into the oxygen suction tank by opening the electromagnetic valve and the air suction fan on the gas circulation loop, the residual oxygen reacts with the reducing agent in the tank and is consumed, the protective gas does not react with the residual oxygen and enters the sealed metal cavity again through the gas pipeline, and the oxygen content in the cavity can be reduced to be within 10 ppm;
5. effectively reduce dust and smog content in the cavity, further reduce water content simultaneously: the dust sensor can detect the dust concentration in the sealed forming gas in real time and feed back the dust concentration to the central control system, the central control system opens the electromagnetic valve and the air exhaust fan on the smoke dust filtering loop according to a preset program, the mixed gas mixed with powder dust in the cavity is subjected to dust blowing and water absorption through the filter and the water absorber, and the smoke dust content and the water content can be reduced to be lower than 10ppm through the step;
6. the central control system consists of a central processing unit, a memory and a peripheral P L C circuit, can read and store the analog quantity read by each sensor and control the sequential operation of the on-off of each electromagnetic valve, the air exhaust fan and the vacuum pump, and has simple and quick human-computer interaction because of the human-computer interface on the touch display screen.
Drawings
FIG. 1 is a schematic structural diagram of a selective laser melting multi-channel dual-cycle atmosphere protection system according to the present invention.
In the figure, 1 is a protective gas cylinder, 2 is a pressure reducing valve A, 3 is an electromagnetic valve A, 4 is a seal molding cavity, 5 is an oxygen content analyzer, 6 is a water content analyzer, 7 is a pressure sensor, 8 is a temperature sensor, 9 is a dust sensor, 10 is an overpressure protection valve, 11 is an electromagnetic valve B, 12 is a smoke filter A, 13 is a vacuum pump, 14 is a smoke filter B, 15 is a horizontal three-way electromagnetic valve, 16 is an air extracting fan A, 17 is an electromagnetic valve C, 18 is a dryer, 19 is an air extracting fan B, 20 is an electromagnetic valve D, 21 is a smoke filter C, 22 is an electromagnetic valve E, 23 is an oxygen absorbing gas cylinder, 24 is an electromagnetic valve F, 25 is a pressure reducing valve B, 26 is reducing gas, 27 is a central control system, 28 is a touch screen display, 29 is a gas pipeline A, 30 is an air inlet pipeline A, 31 is an air inlet pipeline B, 32 is an air inlet pipeline C, 33 is gas line, 34 is gas line, 35 is gas line B, 36 is gas line C, 37 is gas line D, 38 is gas line E, 39 is gas line F, and 40 is gas line G.
Detailed Description
The invention is described in detail below with reference to the following figures and specific examples:
as shown in fig. 1, a multi-channel dual cycle atmosphere protection system comprises: the multi-channel gas replacement passage, the gas circulation loop, the gas reduction passage, the vacuumizing passage, the smoke dust filtering loop, the sealed molding cavity 4 and the central control system 27 are respectively and electrically connected with the multi-channel gas replacement passage, the gas circulation loop, the gas reduction passage, the vacuumizing passage and the smoke dust filtering loop, the oxygen content analyzer 5, the water content analyzer 6, the pressure sensor 7, the temperature sensor 8, the dust sensor 9 and the overpressure protection valve 10 are installed at the top of the sealed molding cavity 4, and the oxygen content analyzer 5, the water content analyzer 6, the pressure sensor 7, the temperature sensor 8 and the dust sensor 9 are respectively connected with the central control system 27.
In the above system, the central control system 27 is further connected to a solenoid valve a3, a solenoid valve B11, a horizontal three-way solenoid valve 15, a solenoid valve C17, a solenoid valve D20, a solenoid valve E22, and a solenoid valve F24;
the gas replacement path includes: one end of a protective gas cylinder 1 is connected with one end of a pressure reducing valve A2, the other end of the pressure reducing valve A2 is connected with one end of an electromagnetic valve A3, the other end of the electromagnetic valve A3 is connected with one end of a gas pipeline A29, the other end of a gas pipeline A29 is connected with one end of a gas inlet pipeline A30, one end of a gas inlet pipeline B31 and one end of a gas inlet pipeline C32, the other ends of the gas inlet pipeline A30, the gas inlet pipeline B31 and the gas inlet pipeline C32 are respectively connected with the lower part of the side surface of a seal molding cavity 4, one end of a gas outlet pipeline 34 is connected with a horizontal three-way electromagnetic valve 15, the other end of the gas outlet pipeline is connected with a smoke filter B737;
the gas circulation loop comprises: one end of a gas pipeline B35 is connected with a horizontal three-way electromagnetic valve 15, the other end of the gas pipeline B35 is connected with an oxygen suction tank 23, the oxygen suction tank 23 is connected with one end of a gas pipeline C36, the other end of the gas pipeline C36 is connected with one end of an air suction fan A16, the other end of the air suction fan A16 is connected with an electromagnetic valve C17, an electromagnetic valve C17 is respectively connected with an air inlet pipeline A30, an air inlet pipeline B31 and an air inlet pipeline C32, and the air suction fan A16 is connected with a touch screen display 28;
the gas reduction path includes: the reducing gas bottle 26 is connected with one end of a reducing valve B25, one end of a reducing valve B25 is connected with a solenoid valve F24, a solenoid valve F24 is connected with one end of a gas pipeline D37, the other end of the gas pipeline D37 is connected with one end of a solenoid valve E22 through an oxygen absorption tank 23, and the other end of the solenoid valve E22 is connected with a gas pipeline E38;
the vacuum-pumping passage comprises: one end of the gas pipeline 33 is connected with the seal molding cavity 4, the other end of the gas pipeline is connected with the electromagnetic valve B11, the electromagnetic valve B11 is connected with the smoke filter A12, the smoke filter A12 is connected with the vacuum pump 13, the vacuum pump 13 is connected with the central control system 27, and the gas pipeline 33 and the smoke filter B14 are positioned on the same side.
The smoke and dust filtration loop include that gas conduit F39 one end connects sealed shaping cavity 4, 18 one end of desicator is connected to the other end, air exhaust fan B19 one end is connected to the desicator 18 other end, air exhaust fan B19 other end connects solenoid valve D20 one end, smoke and dust filter C21 is connected to the solenoid valve D20 other end, gas conduit G40 one end is connected to smoke and dust filter C21 other end, sealed shaping cavity 4 is connected to the gas conduit G40 other end, air exhaust fan B19 and the touch-sensitive screen display that has human-computer interaction interface 28 are connected.
The shielding gas in the shielding gas cylinder 1 is an inert gas, preferably argon.
The reducing gas in the reducing gas cylinder 26 is a mixed gas of hydrogen and argon.
The filter elements in the soot filter a12 and the soot filter B14 are filter elements having a physical adsorption filtering function.
The desiccant in the dryer 18 is a silica gel desiccant.
The set threshold value of the overpressure protection valve 10 is 10 mbar.
The horizontal three-way electromagnetic valve 15 controls the on-off of two ways by a mechanical structure, needs to be horizontally installed, and is also connected to a central control system 27 to control the on-off of the other two ways.
Closing a window door on the sealed molding cavity 4, starting a vacuumizing function on the touch display screen 28, receiving an instruction by the central control system 27 to close all the electromagnetic valves and fans, only opening the electromagnetic valve B11 and the vacuum pump 13, vacuumizing the sealed molding cavity 4 by the vacuum pump 13, and closing the vacuumizing function when the vacuum degree reaches 30-50%, and closing the electromagnetic valve B11 and the vacuum pump 13; after that, the gas replacement function is started on the touch display screen 28, the central control system 27 receives an instruction, the two-way (a and C) of the electromagnetic valve A3 and the two-way (a and C) of the horizontal three-way electromagnetic valve 15 are started, the auxiliary gauge pressure of the pressure reducing valve A2 is manually adjusted to enable the outlet pressure of the protective gas to be 100MPa, the protective gas enters the sealed molding cavity 4 through the gas pipeline A29, the gas inlet pipeline A30, the gas inlet pipeline B31 and the gas inlet pipeline C32, air in the cavity is pushed to be exhausted through the smoke filter B14, the gas outlet pipeline 34 and the horizontal three-way electromagnetic valve 15, when the oxygen content reaches below 200 and 500ppm, the gas replacement function is closed, and the electromagnetic valve A3 and the horizontal three; after that, the metal powder with low requirement on oxygen content can be printed, at the moment, the smoke dust filtering function needs to be started, the central control system receives an instruction, the electromagnetic valve D20 and the air extracting fan B19 are started, through the pipeline design in the cavity, the air extracting fan B19 forms a flowing air field above the paved metal powder and below a light outlet of the galvanometer, the gas containing metal smoke, splash and other particles generated in the printing process is continuously extracted, the gas is adsorbed and filtered by the smoke dust filter C21, the drier 18 absorbs water and dries, and the gas is introduced into the cavity to form a dust removal internal circulation gas circuit; in the process, because the sealing performance of the sealing forming cavity 5 is not enough, the protective gas can leak, so that the protective gas needs to be continuously supplemented with air to maintain the pressure range, the central control system can automatically open the electromagnetic valve A3, the electromagnetic valve B11 and the vacuum pump 13 according to a preset program, the pressure in the cavity is smaller than the preset range, the protective gas is supplemented with air, and the pressure in the cavity is larger than the preset range, so that the air is extracted.
When the requirement for oxygen content is high, after the gas replacement function, a gas circulation function is required: the gas circulation function is selected on the touch display screen 28, after the central control system 27 receives an instruction, other electromagnetic valves and the air extracting fan are closed, only the electromagnetic valve C17, the two-way valve a and the two-way valve C (the two-way valve a and the two-way valve B are closed) of the horizontal three-way electromagnetic valve 15 and the air extracting fan A16 are opened, gas in the cavity enters the oxygen absorbing tank 23 through the smoke filter B14, the gas pipeline 34 and the ports a and C of the horizontal three-way electromagnetic valve 15, the oxygen reacts and is absorbed by reducing agents in the oxygen tank, and residual protective gas enters the sealed forming cavity 4 through the gas pipeline C36, the electromagnetic valve C17, the gas inlet pipeline A30, the gas inlet pipeline B31 and the gas inlet pipeline C32, so that the.
When the system is operated for a period of time, it is necessary to reduce the oxidant in the oxygen-absorbing tank 23: selecting a gas reduction function on the touch display screen 28, after receiving an instruction, the central control system 27 closes the gas electromagnetic valve and the air exhaust fan, opens the electromagnetic valve E22 and the electromagnetic valve F24, manually adjusts the pressure of the auxiliary gauge of the pressure reducing valve B25 to enable the outlet pressure of the reducing gas to be 5MPa, enables the reducing gas to enter the oxygen absorbing tank 23 to react with the oxidant, reduces the reducing gas, and discharges a reaction product through the electromagnetic valve E22 and the gas pipeline E38.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention by equivalent replacement or change according to the technical solution and the inventive concept of the present invention.
Claims (9)
1. A multi-channel dual cycle atmosphere protection system, comprising: the device comprises a multi-channel gas replacement channel, a gas circulation loop, a gas reduction channel, a vacuumizing channel, a smoke dust filtering loop, a sealed molding cavity (4) and a central control system (27), wherein the multi-channel gas replacement channel, the gas circulation loop, the gas reduction channel, the vacuumizing channel and the smoke dust filtering loop are respectively and electrically connected with the central control system (27), an oxygen content analyzer (5), a water content analyzer (6), a pressure sensor (7), a temperature sensor (8), a dust sensor (9) and an overpressure protection valve (10) are installed at the top of the sealed molding cavity (4), and the oxygen content analyzer (5), the water content analyzer (6), the pressure sensor (7), the temperature sensor (8) and the dust sensor (9) are respectively connected with the central control system (27); wherein the gas reduction passage comprises: the reducing gas bottle (26) is connected with one end of a reducing valve B (25), one end of the reducing valve B (25) is connected with a solenoid valve F (24), the solenoid valve F (24) is connected with one end of a gas pipeline D (37), the other end of the gas pipeline D (37) is connected with one end of a solenoid valve E (22) through an oxygen absorption tank (23), and the other end of the solenoid valve E (22) is connected with a gas pipeline E (38).
2. A multi-channel dual cycle atmosphere protection system according to claim 1, wherein the gas displacement path comprises: the protective gas bottle (1) is connected with one end of a pressure reducing valve A (2), the other end of the pressure reducing valve A (2) is connected with one end of an electromagnetic valve A (3), the other end of the electromagnetic valve A (3) is connected with one end of a gas pipeline A (29), the other end of the gas pipeline A (29) is connected with one end of a gas inlet pipeline A (30), a gas inlet pipeline B (31), one end of a gas inlet pipeline C (32) and the gas inlet pipeline A (30), the other ends of the air inlet pipeline B (31) and the air inlet pipeline C (32) are respectively connected with the lower part of the side face of the seal forming cavity (4), one end of the air outlet pipeline (34) is connected with the horizontal three-way electromagnetic valve (15), the other end of the air outlet pipeline is connected with the smoke filter B (14), the smoke filter B (14) is installed on the upper part of the side face of the seal forming cavity (4), and the installation position of the smoke filter B (14) and the installation position of the air inlet pipeline are respectively located on two sides of the seal forming cavity.
3. A multi-channel dual cycle atmosphere protection system according to claim 1, wherein the gas circulation loop comprises: horizontal three-way solenoid valve (15) are connected to gas pipeline B (35) one end, and oxygen uptake jar (23) is connected to the other end, and oxygen uptake jar (23) are connected with gas pipeline C (36) one end, and air exhaust fan A (16) one end is connected to gas pipeline C (36) other end, and air exhaust fan A (16) other end is connected with solenoid valve C (17), and solenoid valve C (17) are connected with admission line A (30), admission line B (31), admission line C (32) respectively.
4. A multi-channel dual cycle atmosphere protection system according to claim 1, wherein the evacuation path comprises: one end of the gas pipeline (33) is connected with the seal molding cavity (4), the other end of the gas pipeline is connected with the electromagnetic valve B (11), the electromagnetic valve B (11) is connected with the smoke filter A (12), the smoke filter A (12) is connected with the vacuum pump (13), the vacuum pump (13) is connected with the central control system (27), and the gas pipeline (33) and the smoke filter B (14) are located on the same side.
5. A multi-channel dual-cycle atmosphere protection system according to claim 1, wherein the smoke filtering circuit comprises a gas pipeline F (39) having one end connected to the sealed forming cavity (4) and the other end connected to one end of the dryer (18), the other end of the dryer (18) being connected to one end of the air exhaust fan B (19), the other end of the air exhaust fan B (19) being connected to one end of the electromagnetic valve D (20), the other end of the electromagnetic valve D (20) being connected to the smoke filter C (21), the other end of the smoke filter C (21) being connected to one end of the gas pipeline G (40), the other end of the gas pipeline G (40) being connected to the sealed forming cavity (4).
6. A multichannel bi-cyclic atmosphere protection system according to claim 2, characterized in that the shielding gas in the shielding gas cylinder (1) is an inert gas; the horizontal three-way electromagnetic valve (15) controls the on-off of two ways by a mechanical structure, is horizontally installed, and the horizontal three-way electromagnetic valve (15) is connected to a central control system (27) to control the on-off of the other two ways.
7. A multi-channel dual cycle atmosphere protection system according to claim 1, wherein the reducing gas in the reducing gas cylinder (26) is a mixture of hydrogen and argon.
8. A multi-channel dual cycle atmosphere protection system according to claim 2 or 4, wherein the filter elements in soot filter A (12) and soot filter B (14) are filter elements having physical adsorption filtering function.
9. A multi-channel dual cycle atmosphere protection system according to claim 5, wherein the desiccant in the dryer (18) is a silica gel desiccant.
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| CN110014152B (en) * | 2019-04-15 | 2021-08-17 | 上海理工大学 | Laminar flow type adjustable air guide device |
| CN110181055A (en) * | 2019-07-02 | 2019-08-30 | 佛山科学技术学院 | A kind of metal 3D printer intelligence deoxygenation circulation purifying method and equipment |
| CN110777242B (en) * | 2019-11-08 | 2021-06-11 | 燕山大学 | Oxidation-reduction protection device of stainless steel tube heat treatment furnace |
| CN111097910B (en) * | 2020-02-06 | 2021-11-30 | 高尚孜 | AI-based environment control system and control method |
| CN115213438A (en) * | 2022-07-01 | 2022-10-21 | 东莞理工学院 | Double-gas-path circulating purification device for laser powder bed melting additive manufacturing |
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| CN209918886U (en) * | 2018-12-28 | 2020-01-10 | 南京航空航天大学 | Multichannel dual cycle atmosphere protection system |
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