A metal 3D printed adjustable wind field structure

Abstract

This invention discloses an adjustable airflow structure for metal 3D printing. A main air outlet is fixed to the top of one side of the inner wall of the printing cavity, with its outlet lower than the laser galvanometer. A secondary air outlet is located on the same side of the inner wall of the printing cavity as the main air outlet, with its outlet parallel to the outlet of the main air outlet and at a 180° angle to the top of the printing cavity. An auxiliary air outlet's outlet is mirror-image of the main air outlet's outlet along the central axis of the printing cavity. An air intake and auxiliary air outlet are located on the same side of the inner wall of the printing cavity, with their outlets parallel. The outlet of the secondary air outlet is vertically higher than the inlet of the air intake. A substrate powder bed is installed at the bottom center of the printing cavity. By coordinating the main and secondary air outlets with the air intake, different airflow operation modes are formed, optimizing the printing atmosphere within the printing cavity and avoiding the dead zones caused by fixed airflow paths in existing airflow structures.

Description

Technical Field

[0001] This invention relates to the field of metal additive manufacturing, and more particularly to a metal 3D printing adjustable airflow structure. Background Technology

[0002] Selective laser melting of metal is an advanced manufacturing technology that uses heat sources such as lasers or electron beams to melt and solidify metal powder layer by layer according to a preset digital model, thereby constructing complex three-dimensional metal parts.

[0003] In the operation of metal 3D printers using selective laser melting (SLM) technology, dust and splatter inevitably occur when the high-energy laser comes into contact with metal powder. Dust significantly interferes with laser power; splatter randomly interferes with the unsintered powder bed, ultimately affecting the surface quality and mechanical properties of the printed sample. Currently, mainstream metal 3D printing equipment uses a split-type airflow structure within the printing cavity, with the air inlet and outlet located at the top and bottom of the inner wall respectively, effectively eliminating splatter interference.

[0004] However, current solutions lack effective methods for handling dust within the printing cavity; existing airflow structures can only blow away dust from the lower right corner. As the height of the printed model changes, the height of the smoke and dust increases accordingly. Dust accumulation near the laser galvanometer causes laser beam refraction and absorbs laser energy, resulting in reduced laser power reaching the powder bed surface and beam shape distortion. In summary, the current airflow structure's defects cause dust accumulation, interfering with the surface quality and mechanical properties of the printed sample. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an adjustable airflow structure for metal 3D printing, which solves the problem that the defects in the airflow structure of existing technologies cannot completely handle dust in the printing cavity, resulting in a reduction in the surface quality and mechanical properties of the printed sample.

[0006] To solve the above problems, the following specific technical solution is provided:

[0007] A metal 3D printed adjustable airflow structure includes: a laser galvanometer, a main air outlet, a secondary air outlet, an auxiliary air outlet, an air intake, and a substrate powder bed;

[0008] The laser galvanometer is fixed inside the printing cavity of the laser selective melting printer and is positioned at the top center of the printing cavity; the laser galvanometer incorporates an XY optical scanning head, an electronic drive amplifier, and an optical reflecting mirror to guide the high-energy laser beam;

[0009] The main air outlet is fixed to the top of one side of the inner wall of the printing cavity, and the outlet end of the main air outlet is lower than the laser galvanometer. The secondary air outlet is located on the inner wall of the printing cavity on the same side as the main air outlet, and the outlet end of the secondary air outlet is parallel to the outlet end of the main air outlet structure and forms a 180° angle with the top of the printing cavity. The outlet end of the auxiliary air outlet is mirror-image of the outlet end of the main air outlet structure along the central axis of the printing cavity. The suction port and the auxiliary air outlet are located on the inner wall of the printing cavity on the same side, and the outlet end of the suction port is parallel to the outlet end of the auxiliary air outlet. The outlet end of the secondary air outlet is higher in vertical height than the inlet end of the suction port. The substrate powder bed is installed at the bottom center of the printing cavity.

[0010] Furthermore, the main air outlet includes an airflow stabilizing structure, a main air outlet drive motor, and a main air outlet airflow guide plate;

[0011] The airflow stabilization structure includes a long baffle that divides the entire flow channel into equal parts, and a short baffle that is disposed inside a single flow channel divided by the long baffle. The long baffle runs through the entire flow channel along the air inlet direction, and the short baffle is disposed from the middle of the flow channel along the air inlet direction. Both the long baffle and the short baffle are multiple pieces, and the long baffle and the short baffle are arranged alternately.

[0012] The main air outlet airflow guide plate and the main air outlet drive motor are located at the air outlet end of the main air outlet, and the main air outlet drive motor drives the main air outlet airflow guide plate to rotate.

[0013] Furthermore, the auxiliary air outlet and the auxiliary air outlet are also equipped with an airflow stabilization structure, an airflow guide plate and a drive motor, and their positions and structures are the same as those of the main air outlet.

[0014] Furthermore, the air inlet of the air intake is provided with a dust collection structure, which consists of five guide vanes. One guide vane is parallel to the air intake direction and is centrally located at the air intake end. The second guide vane from the left, which is close to the centrally located guide vane, forms a 30° angle with the air intake direction. The leftmost guide vane from the left forms a 45° angle with the air intake direction. The first and second guide vanes from the right are mirror images of the first and second guide vanes from the left, respectively.

[0015] Furthermore, the air outlet of the main air nozzle is set at a 135° angle to the top of the printing cavity.

[0016] Furthermore, a smoke concentration sensor is installed next to the laser galvanometer. The smoke concentration sensor detects the smoke concentration near the laser galvanometer and sends a signal to the built-in computer of the metal printer in real time. The built-in computer will change the airflow operation mode according to the smoke concentration in order to pursue a good printing environment.

[0017] Furthermore, the main air outlet and the auxiliary air outlet have the same air outlet area, and are slightly larger than the auxiliary air outlet.

[0018] Furthermore, a filtration and circulation device is provided between the air outlet of the air intake and the air inlet of the main air outlet. The filtration and circulation device contains a filter cotton sheet that can filter metal powder and splashes. At the same time, the compressor in the filtration and circulation device delivers the filtered clean protective gas to the air outlet, so that the protective gas circulates in the printing cavity.

[0019] Furthermore, the air intake is positioned at a set distance above the substrate powder bed, which facilitates the collection of dust and splashes, while ensuring that the airflow does not affect the normal printing of the substrate powder bed.

[0020] An adjustable wind field method based on metal 3D printing, comprising the following steps:

[0021] The selective laser melting printer starts working. The built-in computer sends a signal, activating the built-in circulating filter. Protective gas enters the main air outlet through the gas delivery pipe. At this time, the main air outlet drive motor is stationary, and the main air outlet airflow guide plate is in its initial position. The airflow moves obliquely from the main air outlet to the suction port. Simultaneously, another protective gas is blown into the printing chamber through the auxiliary air outlet. The auxiliary air outlet guide plate drive motor and the auxiliary air outlet airflow guide plate are both in their initial states, and the airflow moves horizontally. The auxiliary air outlet guide plate drive motor also receives a signal, driving the auxiliary air outlet airflow guide plate to rotate upwards until the auxiliary air outlet is closed. The printer starts running. The splatter generated by the substrate powder bed is transported to the suction port by the airflow from the auxiliary air outlet. Dust generated reaches a certain height and is then transported to the suction port by the airflow from the main air outlet.

[0022] After printing for a period of time, when the smoke concentration sensor installed in the printing chamber detects that the dust concentration near the laser galvanometer exceeds a set threshold, it sends a signal to the computer built into the selective laser melting printer. The computer then sends a signal to drive the guide plate drive motor of the main air outlet, causing the main air outlet airflow guide plate to rotate until it is perpendicular to the top of the printing chamber, and the airflow is delivered vertically downwards. At the same time, the guide plate drive motor of the auxiliary air outlet drives the airflow guide plate of the auxiliary air outlet to rotate until the direction of the airflow guide plate is perpendicular to the side wall of the printing chamber, and the airflow is delivered from the auxiliary air outlet to the main air outlet. The blowing direction of the secondary air outlet remains unchanged. The air field forms a rectangular circulation in the printing chamber, and the dust near the laser galvanometer is transported to the bottom of the printing chamber through the air field, and finally blown to the suction port by the secondary air outlet.

[0023] When the smoke concentration sensor installed in the printing chamber detects that the dust concentration near the laser galvanometer has returned to the normal range, it sends a signal to the computer built into the selective laser melting printer. The guide plate drive motor of the main air outlet and the guide plate drive motor of the auxiliary air outlet drive the airflow guide plate to reset, and the air field returns to its initial state.

[0024] The beneficial effects of this invention are:

[0025] This invention enables the creation of different airflow operation modes through the coordination of the main air outlet, secondary air outlet, auxiliary air outlet, and suction outlet, greatly optimizing the printing atmosphere within the printing cavity and avoiding the dead zones caused by the fixed airflow path in existing airflow structures. By relying on adaptive airflow operation paths, the problem of metal powder dust accumulation in dead zones interfering with the surface quality and mechanical properties of printed samples is reduced, thereby improving the overall product quality, reducing the cost of the entire manufacturing process, and increasing production efficiency. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the adjustable wind field structure in an embodiment of the present invention.

[0027] Figure 2 This is a front view of the adjustable wind field structure in an embodiment of the present invention.

[0028] Figure 3 This is a three-dimensional structural diagram of the main air outlet in an embodiment of the present invention.

[0029] Figure 4 This is a detailed structural diagram of the adjustable wind field structure in an embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of the airflow stabilization structure in an embodiment of the present invention.

[0031] Figure 6 This is a three-dimensional structural diagram of the air intake in an embodiment of the present invention.

[0032] Figure 7 This is a schematic diagram illustrating the working principle of the adjustable wind field structure in its initial state in an embodiment of the present invention.

[0033] Figure 8 This is a schematic diagram illustrating the working principle of the circulating wind operation state of the adjustable wind field structure in this embodiment of the invention.

[0034] In the figure, 1 is the laser galvanometer, 2 is the main air outlet, 3 is the auxiliary air outlet, 4 is the auxiliary air outlet, 5 is the air intake, and 6 is the substrate powder bed.

[0035] Airflow stabilization structure 2-1, main air outlet drive motor 2-2, main air outlet airflow guide plate 2-3, auxiliary air outlet drive motor 3-1, auxiliary air outlet airflow guide plate 3-2, auxiliary air outlet drive motor 4-1, auxiliary air outlet airflow guide plate 4-2, dust collection structure 5-1. Detailed Implementation

[0036] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. The objectives and effects of the present invention will become clearer as a result. The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0037] like Figure 1 and Figure 2 As shown, the adjustable airflow structure for metal 3D printing in this embodiment includes: a laser galvanometer 1, a main air outlet 2, a secondary air outlet 3, an auxiliary air outlet 4, an air intake 5, and a substrate powder bed 6. The laser galvanometer 1 is fixed inside the printing cavity of the laser selective melting printer, positioned at the top center of the printing cavity. It houses an XY optical scanning head, an electronic drive amplifier, and optical reflecting mirrors for guiding the high-energy laser beam. The main air outlet 2 is fixed to the top of one side of the inner wall of the printing cavity, forming a 135° angle with the top of the printing cavity. The vertical height of the outlet end of the main air outlet 2 is slightly lower than that of the laser galvanometer 1. The secondary air outlet 3 is located on the inner wall of the printing cavity on the same side as the main air outlet 2, parallel to the main air outlet 2 in the vertical direction, and forming a 180° angle with the top of the printing cavity. The outlet end of the auxiliary air outlet 4 is mirror-image of the outlet end of the main air outlet 2 along the central axis of the printing cavity. The main air outlet 2 and the auxiliary air outlet 3 have the same air outlet area, and are slightly larger than the auxiliary air outlet 4. The suction outlet 5 is located on the inner wall of the printing cavity on the same side as the auxiliary air outlet 4, with the outlet end of the suction outlet 5 parallel to the outlet end of the air outlet 4. The auxiliary air outlet 3 is slightly higher than the suction outlet 5 in vertical height. The substrate powder bed 6 is installed at the center of the bottom of the printing cavity, such as... Figure 2As shown, the air inlet 5 is positioned a certain distance above the substrate powder bed 6, which facilitates the collection of dust and splashes, while ensuring that the airflow does not affect the normal printing of the substrate powder bed.

[0038] A smoke concentration sensor is installed next to the laser galvanometer 1 to detect the smoke concentration near the laser galvanometer 1 and send a signal to the built-in computer of the metal printer in real time. The built-in computer will change the airflow operation mode according to the smoke concentration in order to pursue a good printing environment.

[0039] like Figure 3 and Figure 4 As shown, the main air outlet 2 includes an airflow stabilizing structure 2-1, a guide plate drive motor 2-2, and a main air outlet airflow guide plate 2-3, as follows: Figure 5 As shown, the airflow stabilizing structure 2-1 includes a long baffle that divides the entire flow channel into equal parts, and short baffles disposed within individual flow channels divided by the long baffle. The long baffle extends through the entire flow channel along the air inlet direction, and the short baffles are disposed starting from the middle of the flow channel along the air inlet direction. Both the long and short baffles are multiple pieces, and they are staggered. The main air outlet airflow guide plate and guide plate drive motor are disposed at the air outlet end of the main air outlet, and the guide plate drive motor drives the main air outlet airflow guide plate to rotate. Figure 5 As shown, there are 5 long partitions and 6 short partitions, with the length of the short partitions being half the length of the long partitions. After passing through the airflow stabilizing structure 2-1, the filtered rare gas is blown out as a steady airflow from the outlet of the main air outlet 2. The main air outlet drive motor 2-2 receives a signal from the metal printer and adjusts the orientation of the main air outlet airflow guide plate 2-3, thereby adjusting the direction of the airflow from the main air outlet 2. For example... Figure 4 As shown, the secondary air outlet 3 is equipped with a secondary air outlet drive motor 3-1 and a secondary air outlet airflow guide plate 3-2; the auxiliary air outlet 4 is equipped with an auxiliary air outlet drive motor 4-1 and an auxiliary air outlet airflow guide plate 4-2, both in the same form as the main air outlet 2 with a main air outlet drive motor 2-2 and a main air outlet airflow guide plate 2-3. The secondary air outlet 3 and the auxiliary air outlet 4 can also be equipped with airflow stabilization structures. For example... Figure 1 As shown, the secondary air outlet 3 is also equipped with multiple guide plates that divide the airflow.

[0040] like Figure 6 As shown, the air inlet 5 is equipped with a dust collection structure 5-1. Five guide vanes are arranged near the air inlet of the dust collection structure 5-1. One guide vane is centrally located parallel to the air intake direction. The second guide vane from the left, closest to the central guide vane, forms a 30° angle with the air intake direction, while the leftmost guide vane forms a 45° angle with it. The two guide vanes to the right of the central guide vane are mirror-symmetrically arranged with the left side. The funnel-shaped air inlet 5, in conjunction with the dust collection structure 5-1, ensures a uniform distribution of the exhaust air velocity while reducing dust dispersion caused by turbulence.

[0041] In addition, a filter circulation device can be installed between the air outlet of the air inlet 5 and the air inlet of the main air outlet 2. The filter circulation device has a filter cotton sheet that can filter metal powder and splashes. At the same time, the compressor in the filter circulation device delivers the filtered clean protective gas to the air outlet, so that the protective gas circulates in the printing cavity.

[0042] The adjustable wind field method for metal 3D printing based on the adjustable wind field structure of this embodiment includes the following steps:

[0043] The selective laser melting printer starts working. The built-in computer sends a signal, activating the built-in circulating filter. Protective gas enters the main air outlet 2 through the gas delivery pipe. At this time, the main air outlet drive motor 2-2 is stationary, and the main air outlet airflow guide plate 2-3 is in its initial position. The airflow moves from the upper left to the lower right. Figure 7 As shown, simultaneously, another protective gas is blown into the printing chamber through the secondary air outlet 3. The secondary air outlet drive motor 3-1 and the secondary air outlet airflow guide plate 3-2 are both in their initial state, and the airflow moves horizontally. At the same time, the auxiliary air outlet drive motor 4-1 receives a signal and drives the auxiliary air outlet airflow guide plate 4-2 to rotate upwards to close the auxiliary air outlet 4. At this time, the printer starts to run. The splatter generated by the substrate powder bed 6 is transported to the suction port 5 by the airflow blown out of the secondary air outlet 3, and the generated dust reaches a certain height and is transported to the suction port 5 by the airflow blown out of the main air outlet 2.

[0044] After printing for a period of time, the smoke concentration sensor in the printing chamber detects that the dust concentration near the laser galvanometer 1 is too high. It sends a signal to the computer built into the selective laser melting printer. The computer interprets the signal and drives the main air outlet drive motor 2-2. The main air outlet airflow guide plate 2-3 rotates clockwise until it is perpendicular to the top of the printing chamber, and the airflow is delivered vertically downwards. Simultaneously, the auxiliary air outlet drive motor 4-1 drives the auxiliary air outlet airflow guide plate 4-2 to rotate counterclockwise by 45 degrees until the guide plate is perpendicular to the side wall of the printing chamber, and the airflow is delivered horizontally from right to left. Figure 8 As shown. The blowing direction of the secondary air outlet 3 remains unchanged. At this time, the air field forms a counterclockwise rectangular circulation in the printing chamber. The dust near the laser galvanometer 1 is transported to the bottom of the printing chamber through the counterclockwise air field, and finally blown to the suction port 5 by the secondary air outlet 3.

[0045] When the smoke concentration sensor in the printing chamber detects that the dust concentration near the laser galvanometer 1 has returned to the normal range, it sends a signal to the computer built into the selective laser melting printer. This causes the main air outlet drive motor 2-2 and the auxiliary air outlet drive motor 4-1 to reset the airflow guide plate, restoring the airflow field. Figure 7The initial state.

[0046] During the printing process, the air volume and airflow direction of the three air outlets and air inlet can be manually set. The direction of airflow can be flexibly selected according to the dispersion range of metal powder dust to construct different types of air fields, so as to better clean the dust and splashes in the printing chamber during the printing process.

[0047] This invention alters the airflow direction and volume between the blower and suction ports by controlling the drive motor, thereby changing the airflow pattern within the printing chamber and avoiding the dead zones caused by fixed airflow paths in existing airflow structures. By utilizing an adaptive airflow path, the accumulation of metal powder dust in dead zones reduces interference with the surface quality and mechanical properties of printed samples, thus improving overall product quality. This also reduces the overall manufacturing cost and increases production efficiency.

[0048] It will be understood by those skilled in the art that the above descriptions are merely preferred examples of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. All modifications and equivalent substitutions made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A metal 3D printed adjustable wind field structure, characterized in that, include: Laser galvanometer, main air outlet, secondary air outlet, auxiliary air outlet, suction outlet, substrate powder bed; The laser galvanometer is fixed inside the printing cavity of the laser selective melting printer and is positioned at the top center of the printing cavity; the laser galvanometer incorporates an XY optical scanning head, an electronic drive amplifier, and an optical reflecting mirror to guide the high-energy laser beam; The main air outlet is fixed to the top of one side of the inner wall of the printing cavity, and the outlet end of the main air outlet is lower than the laser galvanometer. The secondary air outlet is located on the inner wall of the printing cavity on the same side as the main air outlet, and the outlet end of the secondary air outlet is parallel to the outlet end of the main air outlet structure and forms a 180° angle with the top of the printing cavity. The outlet end of the auxiliary air outlet is mirror-image of the outlet end of the main air outlet structure along the central axis of the printing cavity. The suction port and the auxiliary air outlet are located on the inner wall of the printing cavity on the same side, and the outlet end of the suction port is parallel to the outlet end of the auxiliary air outlet. The outlet end of the secondary air outlet is higher in vertical height than the inlet end of the suction port. The substrate powder bed is installed at the bottom center of the printing cavity. The main air outlet includes an airflow stabilization structure, a main air outlet drive motor, and a main air outlet airflow guide plate; The airflow stabilization structure includes a long baffle that divides the entire flow channel into equal parts, and a short baffle that is disposed inside a single flow channel divided by the long baffle. The long baffle runs through the entire flow channel along the air inlet direction, and the short baffle is disposed from the middle of the flow channel along the air inlet direction. Both the long baffle and the short baffle are multiple pieces, and the long baffle and the short baffle are arranged alternately. The main air outlet airflow guide plate and the main air outlet drive motor are located at the air outlet end of the main air outlet, and the main air outlet drive motor drives the main air outlet airflow guide plate to rotate.

2. The metal 3D printed adjustable airflow structure according to claim 1, characterized in that, The auxiliary air outlet and the auxiliary air outlet are also equipped with an airflow stabilization structure, an airflow guide plate and a drive motor, and their positions and structures are the same as those of the main air outlet.

3. The metal 3D printed adjustable airflow structure according to claim 2, characterized in that, The air inlet of the air intake is equipped with a dust collection structure, which consists of five guide vanes. One guide vane is parallel to the air intake direction and is centrally located at the air intake end. The second guide vane from the left, which is close to the central guide vane, forms a 30° angle with the air intake direction. The leftmost guide vane from the left forms a 45° angle with the air intake direction. The first and second guide vanes from the right are mirror images of the first and second guide vanes from the left, respectively.

4. The metal 3D printed adjustable airflow structure according to claim 3, characterized in that, The air outlet of the main air blower is set at a 135° angle to the top of the printing cavity.

5. The metal 3D printed adjustable airflow structure according to claim 4, characterized in that, A smoke concentration sensor is installed next to the laser galvanometer. The smoke concentration sensor detects the smoke concentration near the laser galvanometer and sends a signal to the built-in computer of the metal printer in real time. The built-in computer will change the airflow operation mode according to the smoke concentration in order to pursue a good printing environment.

6. The metal 3D printed adjustable airflow structure according to claim 1, characterized in that, The main air outlet and the auxiliary air outlet have the same air outlet area, and are slightly larger than the auxiliary air outlet.

7. The metal 3D printed adjustable airflow structure according to claim 1, characterized in that, A filtration and circulation device is provided between the air outlet of the air intake and the air inlet of the main air outlet. The filtration and circulation device contains a filter cotton sheet that can filter metal powder and splashes. At the same time, the compressor in the filtration and circulation device delivers the filtered clean protective gas to the air outlet, so that the protective gas circulates in the printing cavity.

8. The metal 3D printed adjustable airflow structure according to claim 1, characterized in that, The air intake is positioned at a set distance above the substrate powder bed, which facilitates the collection of dust and splashes, while the airflow does not affect the normal printing of the substrate powder bed.

9. A method for adjustable wind field in metal 3D printing, based on the adjustable wind field structure of metal 3D printing as described in claim 5, characterized in that, Includes the following steps: The selective laser melting printer starts working. The built-in computer sends a signal, activating the built-in circulating filter. Protective gas enters the main air inlet through the gas delivery pipe. At this time, the main air inlet drive motor is stationary, and the main air inlet airflow guide plate is in its initial position. The airflow moves obliquely from the main air inlet to the suction port. Simultaneously, another layer of protective gas is blown into the printing chamber through the auxiliary air inlet. The auxiliary air inlet guide plate drive motor and the auxiliary air inlet airflow guide plate are both in their initial states, and the airflow moves horizontally. The auxiliary air inlet guide plate drive motor also receives a signal, driving the auxiliary air inlet airflow guide plate to rotate upwards until the auxiliary air inlet is closed. When the printer starts running, the splatter generated by the substrate powder bed is transported to the suction port by the airflow blown out by the secondary air outlet, and the generated dust is transported to the suction port by the airflow blown out by the main air outlet after reaching a certain height. After printing for a period of time, when the smoke concentration sensor installed in the printing chamber detects that the dust concentration near the laser galvanometer exceeds a set threshold, it sends a signal to the computer built into the selective laser melting printer. The computer then sends a signal to drive the guide plate drive motor of the main air outlet, causing the main air outlet airflow guide plate to rotate until it is perpendicular to the top of the printing chamber, and the airflow is delivered vertically downwards. At the same time, the guide plate drive motor of the auxiliary air outlet drives the airflow guide plate of the auxiliary air outlet to rotate until the direction of the airflow guide plate is perpendicular to the side wall of the printing chamber, and the airflow is delivered from the auxiliary air outlet to the main air outlet. The blowing direction of the secondary air outlet remains unchanged. The air field forms a rectangular circulation in the printing chamber, and the dust near the laser galvanometer is transported to the bottom of the printing chamber through the air field, and finally blown to the suction port by the secondary air outlet. When the smoke concentration sensor installed in the printing chamber detects that the dust concentration near the laser galvanometer has returned to the normal range, it sends a signal to the computer built into the selective laser melting printer. The guide plate drive motor of the main air outlet and the guide plate drive motor of the auxiliary air outlet drive the airflow guide plate to reset, and the air field returns to its initial state.

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