CN114309668B - Oxygen pressure regulating and controlling system and method suitable for metal additive manufacturing equipment - Google Patents
Oxygen pressure regulating and controlling system and method suitable for metal additive manufacturing equipment Download PDFInfo
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- CN114309668B CN114309668B CN202111505558.1A CN202111505558A CN114309668B CN 114309668 B CN114309668 B CN 114309668B CN 202111505558 A CN202111505558 A CN 202111505558A CN 114309668 B CN114309668 B CN 114309668B
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 188
- 239000001301 oxygen Substances 0.000 title claims abstract description 188
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 188
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 67
- 230000001276 controlling effect Effects 0.000 title claims abstract description 58
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 239000000654 additive Substances 0.000 title claims abstract description 33
- 230000000996 additive effect Effects 0.000 title claims abstract description 33
- 239000002184 metal Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 42
- 238000004140 cleaning Methods 0.000 claims abstract description 38
- 238000012216 screening Methods 0.000 claims description 15
- 230000002159 abnormal effect Effects 0.000 claims description 9
- PWKWDCOTNGQLID-UHFFFAOYSA-N [N].[Ar] Chemical compound [N].[Ar] PWKWDCOTNGQLID-UHFFFAOYSA-N 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 20
- 238000005516 engineering process Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 230000010354 integration Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000110 selective laser sintering Methods 0.000 description 2
- 230000009699 differential effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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Abstract
The invention provides an oxygen pressure regulating system and method suitable for metal additive manufacturing equipment, comprising a working cavity oxygen pressure regulating module, a circulating filter device oxygen pressure regulating module, a powder cleaning platform oxygen pressure regulating module, a PSV device oxygen pressure regulating module and a control module, wherein the control module regulates and controls the content of oxygen, the air pressure and the air pressure difference inside and outside a filter element of the working cavity oxygen pressure regulating module, the circulating filter device oxygen pressure regulating module, the powder cleaning platform oxygen pressure regulating module and the PSV device oxygen pressure regulating module of the metal additive manufacturing equipment; the oxygen pressure regulating and controlling system and method suitable for the metal additive manufacturing equipment can flexibly control parameters of each oxygen pressure regulating and controlling area in the additive manufacturing equipment to achieve oxygen pressure conditions required by forming. The method is beneficial to saving production cost, can perform oxygen pressure control more stably, and remarkably improves the forming quality and forming precision of the workpiece.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to an oxygen pressure regulating system suitable for metal additive manufacturing equipment, and also provides an oxygen pressure regulating method suitable for the metal additive manufacturing equipment.
Background
Additive manufacturing technology, also known as rapid prototyping, is a novel material forming technology based on the idea of digital discrete stacking. The technology has the advantages of high raw material utilization rate, short forming time, easiness in designing complex structure products and the like. The selective laser sintering technology and the selective laser melting technology are important components of additive manufacturing, and the working principle of the selective laser sintering technology and the selective laser melting technology is that powder materials in a selected area are sintered or melted and stacked layer by layer under the action of a laser beam, so that advanced materials are prepared.
The traditional oxygen pressure regulation is to introduce a single flow of protective gas into the working cavity or to manually regulate the flow of the protective gas. The adoption of the traditional oxygen pressure regulation and control can lead to unstable oxygen pressure and influence the forming quality and the forming precision of the workpiece. Meanwhile, due to high cost of the shielding gas, the consumption of the shielding gas is increased by adopting the traditional oxygen pressure regulation and control, so that the production cost is increased.
Disclosure of Invention
Aiming at the problems in the prior art, the oxygen pressure regulating system and the oxygen pressure regulating method suitable for the metal additive manufacturing equipment can flexibly control parameters of each oxygen pressure regulating area in the additive manufacturing equipment to achieve oxygen pressure conditions required by forming. The method is beneficial to saving production cost, can perform oxygen pressure control more stably, and remarkably improves the forming quality and forming precision of the workpiece.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The utility model provides an oxygen pressure regulation and control system suitable for metal additive manufacturing equipment, includes that working chamber oxygen pressure regulation and control module, circulation filter device oxygen pressure regulation and control module, clear powder platform oxygen pressure regulation and control module, PSV device oxygen pressure regulation and control module are through working chamber oxygen pressure regulation and control module, circulation filter device oxygen pressure regulation and control module, clear powder platform oxygen pressure regulation and control module and PSV device oxygen pressure regulation and control module regulate and control the inside oxygen content, air pressure and the inside and outside air pressure difference of filter core of metal additive manufacturing equipment's working chamber, circulation filter device, clear powder platform and PSV device.
In one embodiment, the working chamber oxygen pressure regulation and control module comprises a nitrogen-argon switching electromagnetic valve, a pressure reducing electromagnetic valve, a large-small flow switching electromagnetic valve, an electric proportional valve, an exhaust electromagnetic valve, a mechanical pressure relief valve, a flowmeter, an oxygen analyzer and a pressure transmitter, wherein the nitrogen-argon switching electromagnetic valve is connected with the pressure reducing electromagnetic valve, the pressure reducing electromagnetic valve is connected with the large-small flow switching electromagnetic valve, the large-small flow switching electromagnetic valve is connected with the electric proportional valve, and the electric proportional valve is connected with the flowmeter.
In one embodiment, the oxygen pressure regulation and control module of the circulating filter device comprises an air inlet electromagnetic valve, an air outlet electromagnetic valve, a size flow switching electromagnetic valve, a mechanical pressure relief valve, a flowmeter, an oxygen sensor, a pressure switch and a differential pressure transmitter, wherein the air inlet electromagnetic valve is connected with the size flow switching electromagnetic valve, and the size flow switching electromagnetic valve is connected with the flowmeter.
In one embodiment, the oxygen pressure regulation and control module of the powder cleaning platform comprises an air inlet electromagnetic valve, an air outlet electromagnetic valve, a size flow switching electromagnetic valve, a manual speed regulating valve, a mechanical pressure relief valve, a flowmeter, an oxygen sensor and a pressure transmitter, wherein the air inlet electromagnetic valve is connected with the size flow switching electromagnetic valve, and the size flow switching electromagnetic valve is connected with the flowmeter.
In one embodiment, the PSV device oxygen pressure regulation module comprises a screening device regulation module and a filtering device regulation module,
The screening device regulation and control module comprises an air inlet electromagnetic valve, an air outlet electromagnetic valve, a large and small flow switching electromagnetic valve, a mechanical pressure relief valve, a flowmeter, an oxygen sensor and a pressure switch, wherein the air inlet electromagnetic valve is connected with the large and small flow switching electromagnetic valve, and the large and small flow switching electromagnetic valve is connected with the flowmeter;
The filter device regulation and control module comprises an air inlet electromagnetic valve, an air outlet electromagnetic valve, a large and small flow switching electromagnetic valve, a mechanical pressure relief valve, a flowmeter and a differential pressure transmitter, wherein the air inlet electromagnetic valve is connected with the large and small flow switching electromagnetic valve, and the large and small flow switching electromagnetic valve is connected with the flowmeter.
In one embodiment, the control module comprises an industrial personal computer, an analog quantity acquisition module and a digital quantity acquisition module,
The oxygen analyzer and the oxygen sensor are respectively connected with the industrial personal computer,
The pressure transmitter, the differential pressure transmitter and the pressure switch are respectively connected with the analog quantity acquisition module or the digital quantity acquisition module, the analog quantity acquisition module or the digital quantity acquisition module is respectively connected with a control card in the industrial personal computer,
The automatic control system comprises an analog quantity acquisition module and a digital quantity acquisition module, wherein the analog quantity acquisition module is connected with a control card in the industrial personal computer, the digital quantity acquisition module is connected with a control card in the industrial personal computer, and the control card is connected with the analog quantity acquisition module.
In one embodiment, the working cavity oxygen pressure regulating and controlling module, the circulating filter device oxygen pressure regulating and controlling module, the powder cleaning platform oxygen pressure regulating and controlling module and the PSV device oxygen pressure regulating and controlling module respectively further comprise a buzzer, the buzzer is connected with the digital quantity control module, and the digital quantity acquisition module is connected with a control card in the industrial personal computer.
The invention also provides an oxygen pressure regulating and controlling method suitable for the metal additive manufacturing equipment, which comprises an oxygen pressure regulating and controlling system suitable for the metal additive manufacturing equipment as described above, and also comprises an acquisition step and a control step,
The collecting step is used for collecting the oxygen content and the current air pressure of the current air in the working cavity, the circulating filter device, the powder cleaning platform and the PSV device of the metal additive manufacturing equipment and the current air pressure difference between the inside and the outside of the filter element in the circulating filter device and the PSV device;
The control step is that the industrial personal computer is based on the oxygen content, the current air pressure and the current air pressure difference between the inside and outside of a working cavity, a circulating filter device, a powder cleaning platform and the inside of a PSV device of metal additive manufacturing equipment and a preset target air oxygen content, target air pressure and air pressure difference between the inside and outside of a filter element in the circulating filter device and the inside of the PSV device, and the electromagnetic valves in all modules are controlled to be switched on and off in a combined mode to adjust the oxygen content, the air pressure and the air pressure difference between the inside and outside of the working cavity, the circulating filter device, the powder cleaning platform and the inside of the PSV device.
In one embodiment, the collecting step specifically includes:
In the working cavity oxygen pressure regulation and control module, an oxygen analyzer is connected with an industrial personal computer to collect the current oxygen content in the air in the working cavity, a pressure transmitter is connected with an analog quantity collection module, the analog quantity collection module is connected with a control card, and the control card is embedded into the industrial personal computer to collect the current air pressure in the working cavity;
In the oxygen pressure regulation and control module of the circulating filter device, an oxygen sensor is connected with an industrial personal computer to collect the current oxygen content in the air inside the circulating filter device; the pressure switch is connected with the digital quantity acquisition module, the digital quantity acquisition module is connected with the control card, and the control card is embedded into the industrial personal computer so as to acquire the current air pressure in the circulating filter device; the differential pressure transmitter is connected with the analog quantity acquisition module, the analog quantity acquisition module is connected with the control card, and the control card is embedded into the industrial personal computer so as to acquire the current air pressure difference inside and outside the filter element in the circulating filter device;
In the oxygen pressure regulation and control module of the powder cleaning platform, an oxygen sensor is connected with an industrial personal computer to collect the current oxygen content in the air in the current powder cleaning platform; the pressure transmitter is connected with the analog quantity acquisition module, the analog quantity acquisition module is connected with the control card, and the control card is embedded into the industrial personal computer so as to acquire the current air pressure in the powder cleaning platform;
In the screening device regulation and control module, an oxygen sensor is connected with an industrial personal computer to collect the current oxygen content in the air inside the screening device; the pressure switch is connected with the digital quantity acquisition module, the digital quantity acquisition module is connected with the control card, and the control card is embedded into the industrial personal computer so as to acquire the current air pressure in the screening device;
In the filter device regulation and control module, the pressure difference transmitter is connected with an analog quantity acquisition module, the analog quantity acquisition module is connected with a control card, and the control card is embedded into an industrial personal computer so as to acquire the current air pressure difference inside and outside a filter element inside the filter device.
In one embodiment, the controlling step specifically includes:
In the working cavity oxygen pressure regulation and control module, a nitrogen-argon switching electromagnetic valve, a large-small flow switching electromagnetic valve, an exhaust electromagnetic valve and a buzzer are respectively connected with a digital quantity control module, and the digital quantity control module is connected with a control card; the electric proportional valve is connected with the analog quantity control module, and the analog quantity control module is connected with the control card; the control card is embedded into the industrial personal computer; the industrial control unit is used for controlling the switch of the electromagnetic valve and the electric proportional valve so as to adjust the oxygen content and the air pressure in the working cavity; when the oxygen content or the air pressure is abnormal, alarm information appears on a display screen of the industrial personal computer, and an alarm is given out through a buzzer;
In the oxygen pressure regulation and control module of the circulating filter device, an air inlet electromagnetic valve, an air outlet electromagnetic valve, a size flow switching electromagnetic valve and a buzzer are respectively connected with a digital quantity control module, the digital quantity control module is connected with a control card, and the control card is embedded into an industrial personal computer; the industrial control unit is used for controlling the switch of the electromagnetic valve so as to adjust the oxygen content, the air pressure and the pressure difference between the inside and the outside of the filter element in the circulating filter device; when the oxygen content, the air pressure or the pressure difference between the inside and the outside of the filter element are abnormal, alarm information can appear on a display screen of the industrial personal computer, and an alarm is sent out through a buzzer;
In the oxygen pressure regulation and control module of the powder cleaning platform, an air inlet electromagnetic valve, an air outlet electromagnetic valve, a size flow switching electromagnetic valve and a buzzer are all connected with a digital quantity control module, the digital quantity control module is connected with a control card, and the control card is embedded into an industrial personal computer; the industrial control unit is used for controlling the switch of the electromagnetic valve so as to adjust the oxygen content and the air pressure in the powder cleaning platform; when the oxygen content or the air pressure in the powder cleaning platform is abnormal, alarm information appears on a display screen of the industrial personal computer, and an alarm is given out through a buzzer;
In the PSV device oxygen pressure regulation and control module, an air inlet electromagnetic valve, an air outlet electromagnetic valve, a large and small flow switching electromagnetic valve and a buzzer are all connected with a digital quantity control module, the digital quantity control module is connected with a control card, and the control card is embedded into an industrial personal computer; the industrial control unit is used for controlling the switch of the electromagnetic valve so as to adjust the oxygen content, the air pressure and the air pressure difference inside and outside the filter element of the PSV device; when the oxygen content, the air pressure or the air pressure difference inside and outside the filter element of the PSV device are common, alarm information can appear on a display screen of the industrial personal computer, and an alarm is sent out through a buzzer.
Compared with the prior art, the oxygen pressure regulating system and method suitable for the metal additive manufacturing equipment provided by the invention have the advantages that the air oxygen content and air pressure in each oxygen pressure regulating area and the air pressure difference inside and outside the filter element are regulated by flexibly controlling the switch of the electromagnetic valve of each oxygen pressure regulating area in the additive manufacturing equipment; meanwhile, the consumption of protective gas required by production and manufacture is effectively reduced, the production cost is greatly reduced, the oxygen pressure control can be more stably carried out, and the forming quality and the forming precision of the workpiece are obviously improved.
Detailed Description
The oxygen pressure regulating and controlling system comprises a working cavity oxygen pressure regulating and controlling module, a circulating filter device oxygen pressure regulating and controlling module, a powder cleaning platform oxygen pressure regulating and controlling module, a PSV device oxygen pressure regulating and controlling module and a control module, wherein the control module regulates and controls the oxygen content, the air pressure and the air pressure difference inside and outside a filter element of the working cavity, the circulating filter device, the powder cleaning platform and the PSV device of the metal additive manufacturing equipment through the working cavity oxygen pressure regulating and controlling module, the circulating filter device oxygen pressure regulating and controlling module, the powder cleaning platform oxygen pressure regulating and controlling module and the PSV device oxygen pressure regulating and controlling module;
in this embodiment, the working chamber oxygen pressure regulation and control module includes a nitrogen-argon switching electromagnetic valve, a pressure reducing electromagnetic valve, a large-small flow switching electromagnetic valve, an electric proportional valve, an exhaust electromagnetic valve, a mechanical pressure relief valve, a flowmeter, an oxygen analyzer and a pressure transmitter, wherein the nitrogen-argon switching electromagnetic valve is connected with the pressure reducing electromagnetic valve, the pressure reducing electromagnetic valve is connected with the large-small flow switching electromagnetic valve, the large-small flow switching electromagnetic valve is connected with the electric proportional valve, and the electric proportional valve is connected with the flowmeter;
The oxygen pressure regulation and control module of the circulating filter device comprises an air inlet electromagnetic valve, an air outlet electromagnetic valve, a large and small flow switching electromagnetic valve, a mechanical pressure relief valve, a flowmeter, an oxygen sensor, a pressure switch and a differential pressure transmitter, wherein the air inlet electromagnetic valve is connected with the large and small flow switching electromagnetic valve, and the large and small flow switching electromagnetic valve is connected with the flowmeter;
the powder cleaning platform oxygen pressure regulation and control module comprises an air inlet electromagnetic valve, an air outlet electromagnetic valve, a large and small flow switching electromagnetic valve, a manual speed regulating valve, a mechanical pressure relief valve, a flowmeter, an oxygen sensor and a pressure transmitter, wherein the air inlet electromagnetic valve is connected with the large and small flow switching electromagnetic valve, and the large and small flow switching electromagnetic valve is connected with the flowmeter;
the PSV device oxygen pressure regulating and controlling module comprises a screening device regulating and controlling module and a filtering device regulating and controlling module,
The screening device regulation and control module comprises an air inlet electromagnetic valve, an air outlet electromagnetic valve, a large and small flow switching electromagnetic valve, a mechanical pressure relief valve, a flowmeter, an oxygen sensor and a pressure switch, wherein the air inlet electromagnetic valve is connected with the large and small flow switching electromagnetic valve, and the large and small flow switching electromagnetic valve is connected with the flowmeter;
The filter device regulation and control module comprises an air inlet electromagnetic valve, an air outlet electromagnetic valve, a large and small flow switching electromagnetic valve, a mechanical pressure relief valve, a flowmeter and a differential pressure transmitter, wherein the air inlet electromagnetic valve is connected with the large and small flow switching electromagnetic valve, and the large and small flow switching electromagnetic valve is connected with the flowmeter.
Specifically, the control module comprises an industrial personal computer, an analog quantity acquisition module and a digital quantity acquisition module,
The oxygen analyzer and the oxygen sensor are respectively connected with the industrial personal computer through RS-232 bus communication,
The pressure transmitter, the differential pressure transmitter and the pressure switch are respectively connected with the analog quantity acquisition module or the digital quantity acquisition module, the analog quantity acquisition module or the digital quantity acquisition module is respectively connected with a control card in the industrial personal computer through EtherCAT bus communication,
The automatic control system comprises an analog quantity acquisition module and a digital quantity acquisition module, wherein the analog quantity acquisition module is connected with an industrial personal computer through EtherCAT bus communication, and the analog quantity acquisition module is connected with a control card in the industrial personal computer through the EtherCAT bus communication.
Preferably, the working cavity oxygen pressure regulating and controlling module, the circulating filter device oxygen pressure regulating and controlling module, the powder cleaning platform oxygen pressure regulating and controlling module and the PSV device oxygen pressure regulating and controlling module respectively further comprise buzzers, the buzzers are connected with the digital quantity control module, and the digital quantity acquisition module is connected with a control card in the industrial personal computer through EtherCAT bus communication.
The invention also provides an oxygen pressure regulating and controlling method suitable for the metal additive manufacturing equipment, which comprises an oxygen pressure regulating and controlling system suitable for the metal additive manufacturing equipment as described above, and also comprises an acquisition step and a control step,
The collecting step is used for collecting the oxygen content and the current air pressure of the current air in the working cavity, the circulating filter device, the powder cleaning platform and the PSV device of the metal additive manufacturing equipment and the current air pressure difference between the inside and the outside of the filter element in the circulating filter device and the PSV device;
The control step is that the industrial personal computer is based on the oxygen content, the current air pressure and the current air pressure difference between the inside and outside of a filter element in the circulation filter device and the PSV device and the preset target air oxygen content, the target air pressure and the air pressure difference between the inside and outside of the target filter element, of the working cavity, the circulation filter device, the air oxygen content, the air pressure and the air pressure difference between the inside and outside of the filter element in the circulation filter device, the powder cleaning platform and the PSV device of metal additive manufacturing equipment, and the electromagnetic valves in all modules are controlled to be switched in a combined mode to adjust the working cavity, the circulation filter device, the air oxygen content and the air pressure in the inside and outside of the filter element;
in this embodiment, the collecting step specifically includes:
In the working cavity oxygen pressure regulation and control module, an oxygen analyzer is connected with an industrial personal computer through RS-232 bus communication to collect the current oxygen content in the air in the working cavity, a pressure transmitter is connected with an analog quantity collection module, the analog quantity collection module is connected with a control card through EtherCAT bus communication, and the control card is embedded into the industrial personal computer to collect the current air pressure in the working cavity;
In the oxygen pressure regulation and control module of the circulating filter device, an oxygen sensor is connected with an industrial personal computer through RS-232 bus communication to collect the current oxygen content in the air inside the circulating filter device; the pressure switch is connected with the digital quantity acquisition module, the digital quantity acquisition module is connected with the control card through EtherCAT bus communication, and the control card is embedded into the industrial personal computer so as to acquire the current air pressure in the circulating filter device; the differential pressure transmitter is connected with the analog quantity acquisition module, the analog quantity acquisition module is connected with the control card through EtherCAT bus communication, and the control card is embedded into the industrial personal computer so as to acquire the current air pressure difference inside and outside the filter element in the circulating filter device;
in the oxygen pressure regulation and control module of the powder cleaning platform, an oxygen sensor is connected with an industrial personal computer through RS-232 bus communication to collect the oxygen content in the current air in the current powder cleaning platform; the pressure transmitter is connected with the analog quantity acquisition module, the analog quantity acquisition module is connected with the control card through EtherCAT bus communication, and the control card is embedded into the industrial personal computer so as to acquire the current air pressure in the powder cleaning platform;
In the screening device regulation and control module, an oxygen sensor is connected with an industrial personal computer through RS-232 bus communication to collect the current oxygen content in the air inside the screening device; the pressure switch is connected with the digital quantity acquisition module, the digital quantity acquisition module is connected with the control card through EtherCAT bus communication, and the control card is embedded into the industrial personal computer so as to acquire the current air pressure in the screening device;
In the regulation and control module of the filter device, the differential pressure transmitter is connected with the analog quantity acquisition module, the analog quantity acquisition module is connected with the control card through EtherCAT bus communication, and the control card is embedded into the industrial personal computer so as to acquire the current air pressure difference inside and outside the filter element in the filter device;
The control steps specifically include:
In the working cavity oxygen pressure regulation and control module, a nitrogen-argon switching electromagnetic valve, a large-small flow switching electromagnetic valve, an exhaust electromagnetic valve and a buzzer are respectively connected with a digital quantity control module, and the digital quantity control module is connected with a control card through EtherCAT bus communication; the electric proportional valve is connected with the analog quantity control module, and the analog quantity control module is connected with the control card through EtherCAT bus communication; the control card is embedded into the industrial personal computer; the industrial control unit is used for controlling the switch of the electromagnetic valve and the electric proportional valve so as to adjust the oxygen content and the air pressure in the working cavity; when the oxygen content or the air pressure is abnormal, alarm information appears on a display screen of the industrial personal computer, and an alarm is sent out through a buzzer;
In the oxygen pressure regulation and control module of the circulating filter device, an air inlet electromagnetic valve, an air outlet electromagnetic valve, a size flow switching electromagnetic valve and a buzzer are respectively connected with a digital quantity control module, the digital quantity control module is connected with a control card through EtherCAT bus communication, and the control card is embedded into an industrial personal computer; the industrial control unit is used for controlling the switch of the electromagnetic valve so as to adjust the oxygen content, the air pressure and the pressure difference between the inside and the outside of the filter element in the circulating filter device; when the oxygen content, the air pressure or the pressure difference between the inside and the outside of the filter element are abnormal, alarm information appears on a display screen of the industrial personal computer, and an alarm is sent out through a buzzer;
In the oxygen pressure regulation and control module of the powder cleaning platform, an air inlet electromagnetic valve, an air outlet electromagnetic valve, a size flow switching electromagnetic valve and a buzzer are all connected with a digital quantity control module, the digital quantity control module is connected with a control card through EtherCAT bus communication, and the control card is embedded into an industrial personal computer; the industrial control unit is used for controlling the switch of the electromagnetic valve so as to adjust the oxygen content and the air pressure in the powder cleaning platform; when the oxygen content or the air pressure in the powder cleaning platform is abnormal, alarm information appears on a display screen of the industrial personal computer, and an alarm is sent out through a buzzer;
in the PSV device oxygen pressure regulation and control module, an air inlet electromagnetic valve, an air outlet electromagnetic valve, a large and small flow switching electromagnetic valve and a buzzer are all connected with a digital quantity control module, the digital quantity control module is connected with a control card through EtherCAT bus communication, and the control card is embedded into an industrial personal computer; the industrial control unit is used for controlling the switch of the electromagnetic valve so as to adjust the oxygen content, the air pressure and the air pressure difference inside and outside the filter element of the PSV device; when the oxygen content, the air pressure or the air pressure difference inside and outside the filter element of the PSV device are common, alarm information can appear on a display screen of the industrial personal computer, and an alarm is sent out through a buzzer.
Wherein: the pressure is regulated by an electric proportional valve, the principle is that the pressure is regulated by a PID algorithm, the proportional parameter is set to be 5%, and when the measured value deviates from the given value by 5%, the output control quantity is changed to 100%; when the integration time is set to 5s, the integration time indicates that for a fixed deviation, the output quantity of the integration effect reaches the same output quantity as the proportional effect, and the integration time is required to be 5s; the differential action corrects the output quantity according to the speed generated by the deviation, so that the control process is restored to the original control state as soon as possible.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (3)
1. An oxygen pressure regulating and controlling method suitable for metal additive manufacturing equipment comprises an oxygen pressure regulating and controlling system suitable for metal additive manufacturing equipment, and is characterized in that the oxygen pressure regulating and controlling system suitable for metal additive manufacturing equipment comprises a working cavity oxygen pressure regulating and controlling module, a circulating filter device oxygen pressure regulating and controlling module, a powder cleaning platform oxygen pressure regulating and controlling module, a PSV device oxygen pressure regulating and controlling module and a control module, wherein the control module comprises an industrial personal computer, an analog quantity collecting module and a digital quantity collecting module, the oxygen pressure regulating and controlling method comprises a collecting step and a control step,
The collecting step is used for collecting the oxygen content and the current air pressure of the current air in the working cavity, the circulating filter device, the powder cleaning platform and the PSV device of the metal additive manufacturing equipment and the current air pressure difference between the inside and the outside of the filter element in the circulating filter device and the PSV device;
The control step is that the industrial personal computer is based on the oxygen content, the current air pressure and the current air pressure difference between the inside and outside of a working cavity, a circulating filter device, a powder cleaning platform and the inside of a PSV device of metal additive manufacturing equipment and a preset target air oxygen content, target air pressure and air pressure difference between the inside and outside of a filter element in the circulating filter device and the inside of the PSV device, and the electromagnetic valves in all modules are controlled to be switched on and off in a combined mode to adjust the oxygen content, the air pressure and the air pressure difference between the inside and outside of the working cavity, the circulating filter device, the powder cleaning platform and the inside of the PSV device.
2. The oxygen pressure regulating and controlling method suitable for metal additive manufacturing equipment according to claim 1, wherein the working cavity oxygen pressure regulating and controlling module comprises a nitrogen-argon switching electromagnetic valve, a pressure reducing electromagnetic valve, a large-small flow switching electromagnetic valve, an electric proportional valve, an exhaust electromagnetic valve, a mechanical pressure relief valve, a flowmeter, an oxygen analyzer and a pressure transmitter; the oxygen pressure regulating and controlling module of the circulating filter device comprises an air inlet electromagnetic valve, an air outlet electromagnetic valve, a size flow switching electromagnetic valve, a mechanical pressure relief valve, a flowmeter, an oxygen sensor, a pressure switch and a differential pressure transmitter; the powder cleaning platform oxygen pressure regulation and control module comprises an air inlet electromagnetic valve, an air outlet electromagnetic valve, a size flow switching electromagnetic valve, a manual speed regulating valve, a mechanical pressure release valve, a flowmeter, an oxygen sensor and a pressure transmitter; the PSV device oxygen pressure regulation and control module comprises a screening device regulation and control module and a filtering device regulation and control module; the screening device regulation and control module comprises an air inlet electromagnetic valve, an air outlet electromagnetic valve, a large and small flow switching electromagnetic valve, a mechanical pressure relief valve, a flowmeter, an oxygen sensor and a pressure switch; the filter device regulation and control module comprises an air inlet electromagnetic valve, an air outlet electromagnetic valve, a large and small flow switching electromagnetic valve, a mechanical pressure relief valve, a flowmeter and a differential pressure transmitter;
the collecting step specifically comprises the following steps:
In the working cavity oxygen pressure regulation and control module, an oxygen analyzer is connected with an industrial personal computer to collect the current oxygen content in the air in the working cavity, a pressure transmitter is connected with an analog quantity collection module, the analog quantity collection module is connected with a control card, and the control card is embedded into the industrial personal computer to collect the current air pressure in the working cavity;
In the oxygen pressure regulation and control module of the circulating filter device, an oxygen sensor is connected with an industrial personal computer to collect the current oxygen content in the air inside the circulating filter device; the pressure switch is connected with the digital quantity acquisition module, the digital quantity acquisition module is connected with the control card, and the control card is embedded into the industrial personal computer so as to acquire the current air pressure in the circulating filter device; the differential pressure transmitter is connected with the analog quantity acquisition module, the analog quantity acquisition module is connected with the control card, and the control card is embedded into the industrial personal computer so as to acquire the current air pressure difference inside and outside the filter element in the circulating filter device;
In the oxygen pressure regulation and control module of the powder cleaning platform, an oxygen sensor is connected with an industrial personal computer to collect the current oxygen content in the air in the current powder cleaning platform; the pressure transmitter is connected with the analog quantity acquisition module, the analog quantity acquisition module is connected with the control card, and the control card is embedded into the industrial personal computer so as to acquire the current air pressure in the powder cleaning platform;
In the screening device regulation and control module, an oxygen sensor is connected with an industrial personal computer to collect the current oxygen content in the air inside the screening device; the pressure switch is connected with the digital quantity acquisition module, the digital quantity acquisition module is connected with the control card, and the control card is embedded into the industrial personal computer so as to acquire the current air pressure in the screening device;
In the filter device regulation and control module, the pressure difference transmitter is connected with an analog quantity acquisition module, the analog quantity acquisition module is connected with a control card, and the control card is embedded into an industrial personal computer so as to acquire the current air pressure difference inside and outside a filter element inside the filter device.
3. The oxygen pressure regulating and controlling method suitable for metal additive manufacturing equipment according to claim 2, wherein the working cavity oxygen pressure regulating and controlling module, the circulating filter device oxygen pressure regulating and controlling module, the powder cleaning platform oxygen pressure regulating and controlling module and the PSV device oxygen pressure regulating and controlling module respectively further comprise buzzers;
The control steps specifically include:
In the working cavity oxygen pressure regulation and control module, a nitrogen-argon switching electromagnetic valve, a large-small flow switching electromagnetic valve, an exhaust electromagnetic valve and a buzzer are respectively connected with a digital quantity control module, and the digital quantity control module is connected with a control card; the electric proportional valve is connected with the analog quantity control module, and the analog quantity control module is connected with the control card; the control card is embedded into the industrial personal computer; the industrial control unit is used for controlling the switch of the electromagnetic valve and the electric proportional valve so as to adjust the oxygen content and the air pressure in the working cavity; when the oxygen content or the air pressure is abnormal, alarm information appears on a display screen of the industrial personal computer, and an alarm is given out through a buzzer;
In the oxygen pressure regulation and control module of the circulating filter device, an air inlet electromagnetic valve, an air outlet electromagnetic valve, a size flow switching electromagnetic valve and a buzzer are respectively connected with a digital quantity control module, the digital quantity control module is connected with a control card, and the control card is embedded into an industrial personal computer; the industrial control unit is used for controlling the switch of the electromagnetic valve so as to adjust the oxygen content, the air pressure and the pressure difference between the inside and the outside of the filter element in the circulating filter device; when the oxygen content, the air pressure or the pressure difference between the inside and the outside of the filter element are abnormal, alarm information can appear on a display screen of the industrial personal computer, and an alarm is sent out through a buzzer;
In the oxygen pressure regulation and control module of the powder cleaning platform, an air inlet electromagnetic valve, an air outlet electromagnetic valve, a size flow switching electromagnetic valve and a buzzer are all connected with a digital quantity control module, the digital quantity control module is connected with a control card, and the control card is embedded into an industrial personal computer; the industrial control unit is used for controlling the switch of the electromagnetic valve so as to adjust the oxygen content and the air pressure in the powder cleaning platform; when the oxygen content or the air pressure in the powder cleaning platform is abnormal, alarm information appears on a display screen of the industrial personal computer, and an alarm is given out through a buzzer;
In the PSV device oxygen pressure regulation and control module, an air inlet electromagnetic valve, an air outlet electromagnetic valve, a large and small flow switching electromagnetic valve and a buzzer are all connected with a digital quantity control module, the digital quantity control module is connected with a control card, and the control card is embedded into an industrial personal computer; the industrial control unit is used for controlling the switch of the electromagnetic valve so as to adjust the oxygen content, the air pressure and the air pressure difference inside and outside the filter element of the PSV device; when the oxygen content, the air pressure or the air pressure difference inside and outside the filter element of the PSV device are common, alarm information can appear on a display screen of the industrial personal computer, and an alarm is sent out through a buzzer.
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