CN209986230U

CN209986230U - Adjusting device for atmosphere of metal additive manufacturing equipment

Info

Publication number: CN209986230U
Application number: CN201920701366.XU
Authority: CN
Inventors: 朱岩
Original assignee: Hunan Vanguard Group Co Ltd
Current assignee: Hunan Vanguard Group Co Ltd
Priority date: 2019-05-15
Filing date: 2019-05-15
Publication date: 2020-01-24
Anticipated expiration: 2029-05-15

Abstract

The utility model discloses a regulating device for metal additive manufacturing equipment atmosphere, which comprises an air supply system, a working chamber, a circulating filter system and a central processing unit, wherein the air supply system is provided with an air quantity regulating device, the working chamber is provided with an oxygen sensor, a pressure sensor and a solenoid valve I arranged on an exhaust pipeline, the central processing unit controls the air quantity regulating device and the solenoid valve I by receiving feedback information of the oxygen sensor and the pressure sensor so as to regulate oxygen content and gas pressure value in the working chamber, controls the opening and closing of the solenoid valve I according to the change of the oxygen content and the gas pressure in the working chamber to accurately regulate and control the change of the oxygen content and the gas pressure in the working chamber, and is matched with the auxiliary action of the circulating filter system so as to reduce the oxygen content in the working chamber, thereby realizing the control of the atmosphere in the working, the stability and the safety in the selective melting process of the metal laser are ensured.

Description

Adjusting device for atmosphere of metal additive manufacturing equipment

Technical Field

The utility model relates to a metal vibration material disk field, especially a adjusting device that is used for metal vibration material disk equipment atmosphere.

Background

Selective Laser Melting (SLM) is one of the mainstream directions of the existing additive manufacturing technology, and the technology is a novel comprehensive manufacturing technology relating to multiple subjects, and a metal Selective Laser Melting rapid forming technical device is suitable for manufacturing of complex-shaped structures, multiple varieties and small batches and application in multiple fields, and is an important means for realizing structure adjustment of the manufacturing industry and promoting the manufacturing industry to be greatly strengthened. In the manufacturing process of the SLM, a large amount of metal powder splashes and gasified and oxidized black smoke dust are generated due to high-power laser sintering and melting, and the influence on the manufacturing is mainly reflected in four aspects, namely, the splashes and the smoke dust can pollute the next layer of powder, and defects can be generated after secondary sintering to influence the subsequent powder laying and sintering. Secondly, the smoke dust can pollute the optical protective glasses, which causes the attenuation of laser power and is not beneficial to the stability of the forming. Thirdly, the metal powder which is inflammable and explosive causes unsafety of work. Fourthly, the smoke dust can affect the real-time observation in the forming process. The splashes and fumes are strongly associated with the oxygen content in the working chamber and the powder itself, so that reducing the oxygen content of the working chamber can greatly improve the forming environment and sintering quality and improve safety. In the conventional SLM device, a vacuum pumping manner is mostly adopted and there is no good atmosphere control device and method, and based on the above background, it is very necessary to research an atmosphere device and control method for central processing.

SUMMERY OF THE UTILITY MODEL

In order to fill the blank of prior art, the utility model provides a adjusting device for metal vibration material disk equipment atmosphere.

An adjusting device for metal additive manufacturing equipment atmosphere comprises an air supply system, a working chamber, a circulating filter system and a central processing unit, wherein the air supply system is provided with an air quantity adjusting device, the air supply system is connected with the air supply of the working chamber after being adjusted by the air quantity adjusting device, the working chamber is connected with an air outlet through a pipeline, a solenoid valve I and a filter I are arranged on the pipeline between the working chamber and the air outlet, an air suction port and an air blowing port are respectively arranged on two sides of the working chamber, one end of the circulating filter system is communicated with the air suction port, the other end of the circulating filter system is communicated with the air blowing port to form a circulating loop, the working chamber is further provided with an oxygen sensor and a pressure sensor, and a signal input end of the central processing unit is connected with signal output ends of the oxygen, and controlling the air quantity adjusting device and the electromagnetic valve I by receiving feedback information of the oxygen sensor and the pressure sensor.

As the improvement of above-mentioned scheme, tolerance adjusting device set up in gas supply system inlet end and with on the pipeline between the end of giving vent to anger that the working chamber is connected, tolerance adjusting device include along the solenoid valve II that the pipeline set gradually, the air-vent valve, divide gas piece I, solenoid valve III, divide gas piece II and flow control valve, just divide gas piece I still through branch pipeline connect behind the electric proportional valve with divide gas piece II to connect, solenoid valve II inserts through the pipeline gas supply system inlet end, flow control valve passes through the pipeline and inserts the working chamber, solenoid valve II, electric proportional valve and solenoid valve III respectively with the central processing unit electricity is connected, through central processing unit centralized control realizes right the regulation of gas supply system volume.

As an improvement of the scheme, the circulating and filtering system comprises a filter II and a circulating fan, the air suction port is connected with the filter II through a pipeline, the filter II is connected with the circulating fan through a pipeline, and the circulating fan is connected with the air blowing port through a pipeline to form a circulating loop.

As an improvement of the scheme, a first air inlet and a second air inlet are respectively arranged on two sides of the working cavity, and the flow regulating valve is respectively connected with the first air inlet and the second air inlet through branch pipelines.

As an improvement of the scheme, the working cavity is provided with at least two independent pipelines connected with the exhaust port, and each pipeline is provided with the electromagnetic valve I and the filter I respectively.

As an improvement of the scheme, the electromagnetic valve I is electrically connected with the central processing unit, and the central processing unit controls the opening and closing of the electromagnetic valve I according to feedback information of the oxygen sensor and the pressure sensor.

As an improvement of the scheme, the working cavity is also provided with a safety air valve, and the pressure in the working cavity can automatically open for active pressure relief after increasing to exceed the set value of the safety air valve.

The utility model has the advantages that: the utility model discloses an accurate measurement of oxygen sensor and pressure sensor to work intracavity oxygen content and pressure variation, central processing unit receive behind oxygen sensor and pressure sensor's the monitoring data right thereby each subassembly of tolerance adjusting device carries out central regulation and control inlet flow, and then adjusts work intracavity oxygen content and gas pressure value, and according to the change of work intracavity oxygen content and the change control of gas pressure the switching of solenoid valve I comes accurate regulation and control the oxygen content and the gas pressure change in the work chamber cooperate again circulating and filtering system's auxiliary action is in order to reduce the oxygen content in the work chamber to the realization is to the control of work intracavity atmosphere, guarantees stability and the safety of metal laser selection district melting in-process.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, a regulating device for atmosphere of metal additive manufacturing equipment comprises an air supply system 10, a working chamber 20, a circulating filtration system 30 and a central processing unit 40, wherein protective air is filled into the working chamber 20 by the air supply system 10, an air quantity regulating device 11 is arranged on the air supply system 10, the air supply system 10 is regulated by the air quantity regulating device 11 and then connected with the working chamber 20 to supply air to the working chamber 20, and the air inflow of the protective air is regulated in real time so as to regulate the oxygen content in the working chamber 20, thereby improving the forming environment and sintering quality and improving the safety. Working chamber 20 links to each other with the gas vent through exhaust pipe, be provided with solenoid valve I25 and filter I50 on the pipeline between working chamber 20 and the gas vent, suction port 21 and the mouth 22 of blowing have still been seted up respectively to working chamber 20 both sides, circulation filtration system 30 one end with suction port 21 intercommunication, the other end with the mouth 22 intercommunication of blowing forms circulation circuit to the return circuit air of discharging gradually reduces oxygen content in the working chamber 20. Still be provided with oxygen sensor 23 and pressure sensor 24 on the working chamber 20, central processing unit 40's signal input part connects oxygen sensor 23 and pressure sensor 24's signal output part, central processing unit 40's signal output part connects tolerance adjusting device 11 and solenoid valve I25's signal input part, through receiving oxygen sensor 23 and pressure sensor 24's feedback information control tolerance adjusting device 11 and solenoid valve I25, through the feedback information real time control of oxygen sensor 23 tolerance adjusting device 11 is in order to adjust the air supply volume in gas supply system 10 to the working chamber 20, through the feedback information real time control of pressure sensor 24 the switching of solenoid valve I25, solenoid valve I25 and filter I50 are connected and are set gradually on the exhaust pipe, when the air supply system 10 starts to fill the protective air into the working chamber 20, because the oxygen discharge amount is too large when the protective air is filled into the working chamber 20 in a large amount in a short time in the initial stage, the pressure change in the working chamber 20 is intensified, when the pressure exceeds the set value of the pressure sensor 24, the central processor 40 controls the electromagnetic valve I25 to be opened, so that the air in the working chamber 20 can pass through the filter I50 and then be discharged through the exhaust port, and the purposes of discharging oxygen from the working chamber 20 and maintaining the balance of the pressure in the working chamber 20 are achieved.

As preferred, tolerance adjusting device 11 set up in gas supply system 10 inlet end and with on the pipeline between the end of giving vent to anger that working chamber 20 connects, tolerance adjusting device 11 includes along the pipeline set gradually solenoid valve II 111, air-vent valve 112, divide gas block I113, solenoid valve III 114, divide gas block II 115 and flow control valve 116, just divide gas block I113 still through branch pipeline connect behind the electric proportional valve 117 with divide gas block II 115 to connect, solenoid valve II 111 inserts through the pipeline gas supply system 10 inlet end, flow control valve 116 inserts through the pipeline working chamber 20, solenoid valve II 111, electric proportional valve 117 and solenoid valve III respectively with central processing unit 40 electricity is connected, through central processing unit 40 centralized control realizes the regulation to gas supply system 10 air supply volume. The gas supply system 10 is characterized in that the electromagnetic valve II 111, the pressure regulating valve 112, the gas distributing block I113, the electromagnetic valve III 114, the gas distributing block II 115 and the flow regulating valve 116 are opened at the initial oxygen discharging stage of the working cavity 20, and the electric proportional valve 117 is closed, so that the purpose of rapidly discharging oxygen by large flow of gas supply is achieved, the gas supply system 10 supplies protective gas in the working cavity 20 in a short time, so that oxygen in the working cavity 20 is discharged from the electromagnetic valve I25 after being filtered by the filter I50, when the oxygen sensor 23 arranged on the working cavity 20 detects that the oxygen content in the working cavity 20 is reduced to a set value, the electromagnetic valve II 111, the pressure regulating valve 112, the gas distributing block I113, the electric proportional valve 117, the gas distributing block II 115 and the flow regulating valve 116 are opened, the electromagnetic valve III 114 is closed to convert the small gas supply flow required by stable work in the working cavity 20, and closing one of the solenoid valves I25 to reduce the gas discharge amount, and cooperating with the circulating filter system 30 to gradually reduce the oxygen content in the working chamber 20.

Preferably, the circulation filtering system 30 includes a filter ii 31 and a circulation fan 32, the air suction port 21 is connected to the filter ii 31 through a pipeline, the filter ii 31 is connected to the circulation fan 32 through a pipeline, the circulation fan 32 is connected to the air blowing port 22 through a pipeline to form a circulation loop, when the air supply system 10 fills the shielding gas to reduce the oxygen content in the working chamber 20 so as to reduce the oxygen content in the working chamber 20 to a predetermined value, the air supply system 10 fills the working chamber 20 with the shielding gas with a small flow rate, and reaches the momentum balance between the filled gas and the exhausted gas through the opened electromagnetic valve i 25, the reduction of the residual oxygen content in the working chamber 20 is realized through the circulation loop of the circulation filtering system 30, and gradually exhausts loop air through the circulation loop to reduce the oxygen content in the working chamber 20, finally, most of the residual gas in the working cavity 20 is the shielding gas supplied by the gas supply system 10, and the forming environment and the sintering quality of the metal laser selective melting rapid forming technical equipment cannot be affected.

Preferably, a first air inlet 26 and a second air inlet 27 are respectively arranged at two sides of the working chamber 20, the flow control valve 116 is respectively connected to the first air inlet 26 and the second air inlet 27 through branch pipelines, and the first air inlet 26 and the second air inlet 27 communicated with the air supply system 10 are respectively arranged at two sides of the working chamber 20 to increase the protective gas air inlet amount at the initial oxygen exhaust stage, so that oxygen in the working chamber 20 is rapidly discharged at the initial oxygen exhaust stage.

Preferably, the working chamber 20 is provided with at least two independent pipelines connected to the exhaust port, each pipeline is provided with the electromagnetic valve i 25 and the filter i 50, the electromagnetic valve i 25 is electrically connected to the central processing unit 40, and the central processing unit 40 controls the opening and closing of the electromagnetic valve i 25 according to the feedback information of the oxygen sensor 23 and the pressure sensor 24. At least two independent pipelines are arranged to be connected with the exhaust port, so that the number of the electromagnetic valves I25 is at least two, the central processing unit 40 can control the air discharge amount of the working cavity 20 according to the feedback information of the oxygen sensor 23 and the pressure sensor 24 (the air discharge amount of the working cavity 20 is controlled by controlling the opening and closing of one or 2 or more electromagnetic valves I25), the oxygen content in the working cavity 20 is maintained within a set value range, the pressure change in the working cavity 20 is in a dynamic balance state, and the danger caused by the overlarge pressure change in the working cavity 20 due to the overlarge gas content change in the working cavity 20 is avoided.

Preferably, a safety air valve 28 is further disposed on the working chamber 20, and the active pressure relief is automatically started after the pressure in the working chamber 20 increases and exceeds a set value of the safety air valve 28.

Finally, the above embodiments are only used for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution, which should be covered by the claims of the present invention.

Claims

1. A regulating device for an atmosphere of a metal additive manufacturing apparatus, comprising a gas supply system (10), a working chamber (20), a circulating filter system (30) and a central processor (40), characterized in that: the gas supply system (10) is provided with a gas amount adjusting device (11), the gas supply system (10) is connected with the working cavity (20) to supply gas for the working cavity (20) after being adjusted by the gas amount adjusting device (11), the working cavity (20) is connected with the exhaust port through a pipeline, a solenoid valve I (25) and a filter I (50) are arranged on the pipeline between the working cavity (20) and the exhaust port, both sides of the working cavity (20) are respectively provided with an air suction port (21) and an air blowing port (22), one end of the circulating and filtering system (30) is communicated with the air suction port (21), the other end is communicated with the air blowing port (22) to form a circulating loop, the working cavity (20) is also provided with an oxygen sensor (23) and a pressure sensor (24), the signal input end of the central processing unit (40) is connected with the signal output ends of the oxygen sensor (23) and the pressure sensor (24).

2. A conditioning device for an atmosphere of a metal additive manufacturing apparatus according to claim 1, characterized in that: tolerance adjusting device (11) set up in gas supply system (10) inlet end and with on the pipeline between the end of giving vent to anger that working chamber (20) are connected, tolerance adjusting device (11) include along solenoid valve II (111), air-vent valve (112) that the pipeline set gradually, divide gas block I (113), solenoid valve III (114), divide gas block II (115) and flow control valve (116), just divide gas block I (113) still through branch pipeline connect behind electric proportional valve (117) with divide gas block II (115) to connect, solenoid valve II (111), electric proportional valve (117) and solenoid valve III (114) respectively with central processing unit (40) electricity is connected.

3. A conditioning device for an atmosphere of a metal additive manufacturing apparatus according to claim 2, characterized in that: the circulating and filtering system (30) comprises a filter II (31) and a circulating fan (32), the air suction port (21) is connected with the filter II (31) through a pipeline, the filter II (31) is connected with the circulating fan (32) through a pipeline, and the circulating fan (32) is connected with the air blowing port (22) through a pipeline to form a circulating loop.

4. A conditioning device for an atmosphere of a metal additive manufacturing apparatus according to claim 2, characterized in that: and a first air inlet (26) and a second air inlet (27) are respectively arranged on two sides of the working cavity (20), and the flow regulating valve (116) is respectively connected with the first air inlet (26) and the second air inlet (27) through branch pipelines.

5. A conditioning device for an atmosphere of a metal additive manufacturing apparatus according to claim 1, characterized in that: the working cavity (20) is provided with at least two independent pipelines connected with the exhaust port, and each pipeline is provided with the electromagnetic valve I (25) and the filter I (50) respectively.

6. A conditioning device for an atmosphere of a metal additive manufacturing apparatus according to claim 5, characterized in that: the electromagnetic valve I (25) is electrically connected with the central processing unit (40), and the central processing unit (40) controls the opening and closing of the electromagnetic valve I (25) according to feedback information of the oxygen sensor (23) and the pressure sensor (24).

7. A conditioning device for an atmosphere of a metal additive manufacturing apparatus according to claim 1, characterized in that: the working cavity (20) is also provided with a safety air valve (28), and the pressure in the working cavity (20) can automatically open for active pressure relief after increasing to exceed the set value of the safety air valve (28).