Ventilation system applied to 3D printing device

Abstract

The utility model belongs to the technical field of 3D printing, and particularly relates to a ventilation system applied to a 3D printing device. Comprising a rack provided with a printing forming bin, a printing platform arranged in the printing forming bin, a smoke dust collecting mechanism arranged in the printing forming bin and located above the printing platform, and a blowing smoke blocking mechanism arranged in the printing forming bin and located above the smoke dust collecting mechanism. Powder is burnt or thermally decomposed on the printing platform to generate black smoke, the black smoke is collected through the smoke dust collecting mechanism, and the air blowing and smoke blocking mechanism blows air to form an air curtain to prevent the black smoke generated on the printing platform from diffusing to the top of the printing forming bin, so that the top of the printing forming bin is prevented from being blackened, and the smoke collecting efficiency and the smoke collecting effect are improved; the harm of the black smoke to the environment and health is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of 3D printing, and particularly relates to a ventilation system applied to a 3D printing device. Background Art

[0002] 3D printing is a high-tech manufacturing technology based on the material accumulation method. According to the three-dimensional model data designed by a computer, some complex-shaped parts that are difficult to complete by traditional processes can be manufactured by a forming device in a material accumulation manner. It uses powder materials for forming, such as ceramic powder and metal powder. During the printing process of existing 3D printers, black smoke is generated when the powder material in the printing and forming chamber burns or thermally decomposes. The black smoke will spread to the top of the printing and forming chamber, causing "black top", and it also has potential hazards to the environment and health. Summary of the Invention

[0003] The purpose of the utility model is to provide a ventilation system applied to a 3D printing device, which can collect black smoke, prevent the black smoke from spreading to the top of the printing and forming chamber, and reduce the harm caused by the black smoke to the environment and health.

[0004] The utility model is realized by the following technical solutions:

[0005] A ventilation system applied to a 3D printing device includes:

[0006] A frame provided with a printing and forming chamber, and a printing platform is arranged in the printing and forming chamber;

[0007] A soot collection mechanism is arranged above the printing platform and is used for collecting the black smoke generated on the printing platform during the printing process;

[0008] A blowing and smoke blocking mechanism is arranged above the soot collection mechanism and is used for blowing to form a wind curtain to prevent the black smoke generated on the printing platform from spreading to the top of the printing and forming chamber.

[0009] As described above, a ventilation system applied to a 3D printing device, wherein the soot collection mechanism includes:

[0010] A soot collection box is arranged in the printing and forming chamber and on one side of the printing platform;

[0011] A first blowing channel is arranged on the other side of the printing platform opposite to the soot collection box, and the air outlet of the first blowing channel is communicated with the printing and forming chamber for blowing air flow towards the soot collection box;

[0012] A first air outlet plate covers the air outlet of the first blowing channel, and a plurality of first air outlet holes are arranged on the first air outlet plate along the length direction and width direction of the first air outlet plate, and the first air outlet holes communicate the printing and forming chamber and the first blowing channel.

[0013] As described above, a ventilation system applied to a 3D printing device, the apertures of the plurality of first air outlet holes gradually increase from top to bottom.

[0014] As described above, a ventilation system applied to a 3D printing device, the soot collection box includes:

[0015] A smoke collection box body, an air inlet facing the first blowing channel is provided on the side wall of the smoke collection box body, and a smoke outlet is provided at one end of the smoke collection box body;

[0016] A smoke collection plate, the smoke collection plate bends and extends along the direction from the air inlet to the smoke outlet, and the plurality of smoke collection plates are arranged along the length direction of the air inlet;

[0017] A smoke collection channel, one end of which is communicated with the smoke outlet, and the other end extends out of the printing and forming chamber.

[0018] As described above, a ventilation system applied to a 3D printing device, the blowing and smoke blocking mechanism includes:

[0019] A second blowing channel, one end of which is communicated with the printing and forming chamber, and the other end extends out of the printing and forming chamber;

[0020] A second air outlet plate, which covers the air outlet of the second blowing channel, and a plurality of second air outlet holes arranged along the length direction and width direction of the second air outlet plate are provided on the second air outlet plate, and the second air outlet holes communicate the printing and forming chamber and the second blowing channel.

[0021] As described above, a ventilation system applied to a 3D printing device, the second air outlet plate includes an air outlet installation part installed on the inner wall of the printing and forming chamber, and a conical air collecting cavity extending away from the second blowing channel along the air outlet installation part, and the second air outlet holes are provided on the end surface of the conical air collecting cavity.

[0022] As described above, a ventilation system applied to a 3D printing device further includes a powder spreading and feeding structure, and the powder spreading and feeding structure includes:

[0023] A powder feeding bin, which is arranged above the frame and used for storing powder;

[0024] A powder feeding connecting piece, which is used to connect the frame and the powder feeding bin, and an accommodating cavity, a feeding port communicating the accommodating cavity and the powder feeding bin, and a discharging port communicating the accommodating cavity and the printing and forming chamber are provided on the powder feeding connecting piece, and the powder in the powder feeding bin can fall into the printing and forming chamber through the accommodating cavity;

[0025] A powder falling control mechanism, which is arranged in the accommodating cavity and used for blocking the powder from falling from the powder feeding bin into the printing and forming chamber, or for quantitatively conveying the powder in the powder feeding bin to the printing and forming chamber.

[0026] As described above, a ventilation system for a 3D printing device, the powder dropping control mechanism includes:

[0027] A rotating roller rotatably disposed in the accommodating cavity for blocking powder from falling from the powder feeding bin into the printing and forming bin;

[0028] A powder feeding groove axially disposed along the rotating roller on the outer sidewall of the rotating roller;

[0029] A rotation driving member for driving the rotating roller to rotate, and the rotating roller can rotate to connect the powder feeding groove with the feeding port or the discharging port.

[0030] As described above, a ventilation system for a 3D printing device, a powder spreading mechanism and two oppositely arranged powder guiding plates are provided in the printing and forming bin. A powder guiding channel is formed between the two powder guiding plates. One end of the powder guiding channel is communicated with the discharging port, and the other end extends towards the powder spreading mechanism for conveying powder onto the powder spreading mechanism.

[0031] As described above, a ventilation system for a 3D printing device, the powder spreading mechanism includes:

[0032] A first mounting plate movably disposed in the printing and forming bin;

[0033] A second mounting plate disposed on one side of the first mounting plate, and a powder spreading cavity and a powder spreading port communicated with the powder spreading cavity and located below the powder spreading cavity are formed between the second mounting plate and the first mounting plate. The powder spreading cavity is conical;

[0034] A powder spreading driving assembly disposed in the printing and forming bin for driving the first mounting plate to reciprocate;

[0035] A scraper disposed on the side of the first mounting plate away from the second mounting plate, and one end extends below the first mounting plate;

[0036] A third mounting plate disposed on the side of the first mounting plate away from the second mounting plate for fixedly mounting the scraper.

[0037] Compared with the prior art, the present utility model has the following advantages:

[0038] The utility model provides a ventilation system applied to a 3D printing device, which includes a frame provided with a printing and forming chamber, a printing platform arranged in the printing and forming chamber, a soot collection mechanism arranged in the printing and forming chamber and above the printing platform, and a blowing and smoke blocking mechanism arranged in the printing and forming chamber and above the soot collection mechanism. During the printing process of the 3D printing device, powder burns or thermally decomposes on the printing platform to generate black smoke. The black smoke is collected by the soot collection mechanism, and a wind curtain is formed by blowing through the blowing and smoke blocking mechanism to block the diffusion of the black smoke generated on the printing platform to the top of the printing and forming chamber, not only preventing the top of the printing and forming chamber from being stained black, but also improving the smoke collection efficiency and effect, and reducing the harm caused by black smoke to the environment and health. Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments.

[0040] Figure 1 Structural schematic diagram of the ventilation system applied to the 3D printing device in the specific embodiment of the present utility model;

[0041] Figure 2 Cross-sectional structural schematic diagram of the ventilation system applied to the 3D printing device in the specific embodiment of the present utility model;

[0042] Figure 3 Structural schematic diagram of the soot collection box in the specific embodiment of the present utility model; [[ID=??]] [[ID=1??]]

[0043] [[ID=2??]] Figure 4 [[ID=3??]] [[ID=4??]]

[0044] [[ID=5??]] Figure 5 [[ID=6??]] [[ID=7??]]

[0045] [[ID=8??]] Figure 6 [[ID=9??]]For [[ID=10??]] Figure 5 [[ID=11??]]Partial enlarged view of a in [[ID=12??]] [[ID=13??]]

[0046] [[ID=14??]] Figure 7 [[ID=15??]]Partial exploded structural schematic diagram of the powder spreading mechanism in the specific embodiment of the present utility model. [[ID=16??]] [[ID=17??]]Detailed Description of the Invention[[ID=18??]] [[ID=19??]]

[0047] [[ID=20??]]In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer, the following further details the present utility model in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. [[ID=21??]] [[ID=22??]]

[0048] It seems there are some unclear or incorrect tags in the original text which might cause some confusion during translation. I've done my best to translate based on the provided content. If you have any further questions or need clarification, please let me know.​When the embodiments of the present utility model mention ordinal numbers such as "first" and "second", unless they actually express an order according to the context, they should be understood as merely for distinction purposes.

[0049] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0050] Specific embodiments, such as Figure 1-7 A ventilation system applied to a 3D printing device shown in the figure includes: a frame 1 provided with a printing and forming chamber 2, and a printing platform 4 is arranged in the printing and forming chamber 2; a soot collection mechanism 51 is arranged above the printing platform 4 and is used for collecting the black smoke generated on the printing platform 4 during printing; a blowing and smoke blocking mechanism 52 is arranged above the soot collection mechanism 51 and is used for blowing to form a wind curtain to block the diffusion of the black smoke generated on the printing platform 4 to the top of the printing and forming chamber 2. During the printing process of the 3D printing device, the powder burns or thermally decomposes on the printing platform to generate black smoke. The black smoke is collected by the soot collection mechanism, and the blowing and smoke blocking mechanism blows to form a wind curtain to block the diffusion of the black smoke generated on the printing platform to the top of the printing and forming chamber, which not only prevents the top of the printing and forming chamber from being stained black, but also improves the smoke collection efficiency and effect, and reduces the harm caused by the black smoke to the environment and health.

[0051] Specifically, the soot collection mechanism 51 includes: a soot collection box 511 which is arranged in the printing and forming chamber 2 and on one side of the printing platform 4; a first blowing channel 512 which is arranged opposite to the soot collection box 511 on the other side of the printing platform 4, and the air outlet of the first blowing channel 512 is communicated with the printing and forming chamber 2 for blowing air flow towards the soot collection box 511; a first air outlet plate 513 which covers the air outlet of the first blowing channel 512, and a plurality of first air outlet holes 514 are arranged on the first air outlet plate 513 along the length and width directions of the first air outlet plate 513, and the first air outlet holes 514 communicate the printing and forming chamber 2 and the first blowing channel 512. The air flow is sent to the first blowing channel 512 by a fan, and the air flow blows out from the first air outlet holes 514 of the first air outlet plate 513 and blows the black smoke generated by the burning or thermal decomposition of the powder on the printing platform to the soot collection box 511 for collection.

[0052] In addition, the apertures of the plurality of the first air outlet holes 514 gradually increase from top to bottom. According to the principle of fluid mechanics, that is, the air outlet speed of the first air outlet holes 514 gradually decreases from top to bottom, which can not only ensure the black smoke collection efficiency, but also avoid the excessive air outlet speed of the lower first air outlet holes 514 from blowing away the powder material.

[0053] Further, the soot collection box 511 includes: a smoke collection box body 5111, a smoke inlet 53 facing the first blowing channel 512 is provided on the side wall of the smoke collection box body 5111, and a smoke outlet 54 is provided at one end of the smoke collection box body 5111; a smoke collection plate 5112, the smoke collection plate 5112 is bent and extends in the direction from the smoke inlet 53 to the smoke outlet 54, and the plurality of smoke collection plates 5112 are arranged along the length direction of the smoke inlet 53; a smoke collection channel 5113, one end of which is communicated with the smoke outlet 54, and the other end extends out of the printing and forming chamber 2. High efficiency.

[0054] More specifically, the blowing and smoke blocking mechanism 52 includes: a second blowing channel 521, one end of which is communicated with the printing and forming chamber 2, and the other end extends out of the printing and forming chamber 2; a second air outlet plate 522, which covers the air outlet of the second blowing channel 521, and a plurality of second air outlet holes 523 arranged along the length direction and the width direction of the second air outlet plate 522 are provided on the second air outlet plate 522, and the second air outlet holes 523 communicate the printing and forming chamber 2 and the second blowing channel 521. A blower is used to supply air to the second blowing channel 521, and the air flow forms an air curtain through the second air outlet holes 523 of the second air outlet plate 522 to block the diffusion of the black smoke generated on the printing platform to the top of the printing and forming chamber, which not only prevents the top of the printing and forming chamber from being stained black, but also improves the smoke collection efficiency and the smoke collection effect, and reduces the harm caused by the black smoke to the environment and health.

[0055] Further, the second air outlet plate 522 includes an air outlet installation part 5221 installed on the inner wall of the printing and forming chamber 2, and a conical air gathering cavity 5222 extending from the air outlet installation part 5221 in a direction away from the second blowing channel 521, and the second air outlet holes 523 are provided on the end surface of the conical air gathering cavity 5222. It is convenient to disassemble, assemble and clean, and the air flow velocity is increased by gathering air through the conical air gathering cavity 5222.

[0056] Furthermore, it further includes a powder spreading and feeding structure, and the powder spreading and feeding structure includes: a powder feeding bin 31, which is arranged above the frame 1 and used for storing powder; a powder feeding connecting piece 32, which is used for connecting the frame 1 and the powder feeding bin 31, and an accommodating cavity 33, a feeding port 34 communicating the accommodating cavity 33 and the powder feeding bin 31, and a discharging port 35 communicating the accommodating cavity 33 and the printing and forming bin 2 are arranged on the powder feeding connecting piece 32, and the powder in the powder feeding bin 31 can fall into the printing and forming bin 2 through the accommodating cavity 33; a powder falling control mechanism 36, which is arranged in the accommodating cavity 33 and used for blocking the powder from falling from the powder feeding bin 31 into the printing and forming bin 2, or for quantitatively conveying the powder in the powder feeding bin 31 into the printing and forming bin 2. During use, the powder in the powder feeding bin is quantitatively conveyed into the printing and forming bin through the powder falling control mechanism, and after the required amount of powder is sufficient, the powder falling control mechanism can timely block the powder from falling from the powder feeding bin into the printing and forming bin, avoiding excessive powder falling, resulting in the need to re-collect the powder, ensuring the printing efficiency, and at the same time avoiding insufficient powder falling affecting the printing forming quality.

[0057] Specifically, the powder falling control mechanism 36 includes: a rotating roller 361, which is rotatably arranged in the accommodating cavity 33 and used for blocking the powder from falling from the powder feeding bin 31 into the printing and forming bin 2; a powder feeding groove 362, which is arranged on the outer side wall of the rotating roller 361 along the axial direction of the rotating roller 361; a rotating driving part 363, which is used for driving the rotating roller 361 to rotate, and the rotating roller 361 can rotate to make the powder feeding groove 362 communicate with the feeding port 34 or the discharging port 35. During use, the powder is stored in the powder feeding bin 31, and the rotating roller 361 is used to block the powder from falling from the powder feeding bin 31 into the printing and forming bin 2. When the rotating driving part 363 drives the rotating roller 361 to rotate until the powder feeding groove 362 communicates with the feeding port 34, the powder in the powder feeding bin 31 falls into the powder feeding groove 362, and then the rotating driving part 363 drives the rotating roller 361 to rotate until the powder feeding groove 362 communicates with the discharging port 35, and the powder in the powder feeding groove 362 can be sent into the printing and forming bin 2 through the discharging port 35. The powder conveying amount each time is the amount accommodated in the powder feeding groove 362. The rotating driving part 363 drives the rotating roller 361 to continuously rotate, realizing quantitative powder conveying, and can timely stop conveying to block the powder from falling from the powder feeding bin into the printing and forming bin, avoiding excessive powder falling, resulting in the need to re-collect the powder, ensuring the printing efficiency, and at the same time avoiding insufficient powder falling affecting the printing forming quality. At the same time, the rotating roller 361 is used to rotate and stir to convey the powder, with higher conveying efficiency and can avoid material jamming. Optionally, the rotating driving part 363 is a rotating motor.

[0058] In addition, in order to improve the powder feeding efficiency, a plurality of the powder feeding grooves 362 are arranged at equal intervals along the circumferential direction of the rotating roller 361. To ensure that when one powder feeding groove 362 is opposite to the feeding port 34, another powder feeding groove 362 is opposite to the discharging port 35.

[0059] Further, a filter plate 37 and a filter plate installation groove 38 for embedding the filter plate 37 are provided on the powdering connecting member 32. The filter plate installation groove 38 is respectively communicated with the powdering bin 31 and the feeding port 34. After the powder passes through the filter holes of the filter plate 37, it falls into the printing and forming bin 2, making the powdering more uniform.

[0060] More specifically, the powdering bin 31 includes a bin body 311, a powder inlet 312 provided at the upper end of the bin body 311, a powder outlet 313 provided at the lower end of the bin body 311, and a transparent viewing window 314 provided on the side wall of the bin body 311. It is convenient to observe the remaining amount of powder in the bin body 311 through the transparent viewing window 314.

[0061] Further, a powder spreading mechanism 39 and two oppositely arranged powder guiding plates 310 are provided in the printing and forming bin 2. A powder guiding channel 3101 is formed between the two powder guiding plates 310. One end of the powder guiding channel 3101 is communicated with the discharging port 35, and the other end extends towards the powder spreading mechanism 39, for transporting the powder onto the powder spreading mechanism 39. The powder is transported to the powder spreading mechanism 39 through the powder guiding channel 3101 formed by the two oppositely arranged powder guiding plates 310, which can avoid powder splashing.

[0062] Still further, the powder spreading mechanism 39 includes: a first mounting plate 391, which is movably arranged in the printing and forming bin 2; a second mounting plate 392, which is arranged on one side of the first mounting plate 391, and forms a powder spreading cavity 315 between the second mounting plate 392 and the first mounting plate 391, and a powder spreading port 318 that is communicated with the powder spreading cavity 315 and is located below the powder spreading cavity 315. The powder spreading cavity 315 is conical; a powder spreading driving assembly 393, which is arranged in the printing and forming bin 2 and is used to drive the first mounting plate 391 to reciprocate.

[0063] Specifically, the powder spreading driving assembly 393 includes: a powder spreading driving guide rail 3931, which is horizontally arranged in the printing and forming bin 2; a powder spreading driving slider 3932, which is horizontally movably arranged on the powder spreading driving guide rail 3931, and the first mounting plate 391 is arranged on the powder spreading driving slider 3932; a powder spreading driving member 3933, which is used to drive the powder spreading driving slider 3932 to reciprocate horizontally. Optionally, the powder spreading driving member 3933 can be driven by a telescopic cylinder or driven by a motor-driven conveyor line.

[0064] More specifically, the powder spreading mechanism 39 further includes: a scraper 394, which is arranged on the side of the first mounting plate 391 away from the second mounting plate 392, and one end extends below the first mounting plate 391; a third mounting plate 395, which is arranged on the side of the first mounting plate 391 away from the second mounting plate 392 for fixedly installing the scraper 394. Using the scraper 394 makes the powder spreading on the printing platform more uniform and thinner.

[0065] In addition, a plurality of first mounting holes 316 arranged along the length direction are provided on the first mounting plate 391, and a plurality of second mounting holes 317 corresponding to the first mounting holes 316 are provided on the third mounting plate 395. The second mounting holes 317 are kidney-shaped holes arranged along the vertical direction. The detachable installation is realized through the first mounting holes 316, the second mounting holes 317 and the connecting bolts, and since the second mounting holes 317 are kidney-shaped holes arranged along the vertical direction, the position of the scraper 394 in the vertical direction can be adjusted.

[0066] As described above is an implementation manner provided in combination with specific content, and it is not considered that the specific implementation of the present invention is only limited to these descriptions. At the same time, due to different industry names, it is not limited to the above names or English names. Any method, structure, etc. that is similar or identical to the present invention, or any technical deduction or replacement made under the premise of the concept of the present invention, should be regarded as the protection scope of the present invention.

Claims

1. A ventilation system applied to a 3D printing device, characterized in that, Comprising: A frame (1) provided with a printing and forming chamber (2), and a printing platform (4) is arranged inside the printing and forming chamber (2); A soot collection mechanism (51) arranged above the printing platform (4) for collecting the black smoke generated on the printing platform (4) during printing; A blowing and smoke-blocking mechanism (52) arranged above the soot collection mechanism (51) for blowing to form a wind curtain to block the diffusion of the black smoke generated on the printing platform (4) to the top of the printing and forming chamber (2); The blowing and smoke-blocking mechanism (52) includes: A second blowing channel (521) with one end communicating with the printing and forming chamber (2) and the other end extending outside the printing and forming chamber (2); A second air outlet plate (522) covering the air outlet of the second blowing channel (521), and a plurality of second air outlet holes (523) are arranged on the second air outlet plate (522) along the length and width directions of the second air outlet plate (522), and the second air outlet holes (523) communicate the printing and forming chamber (2) and the second blowing channel (521).

2. The ventilation system applied to the 3D printing device according to claim 1, wherein The soot collection mechanism (51) includes: A soot collection box (511) arranged inside the printing and forming chamber (2) and located on one side of the printing platform (4); A first blowing channel (512) oppositely arranged with the soot collection box (511) on the other side of the printing platform (4), and the air outlet of the first blowing channel (512) communicates with the printing and forming chamber (2) for blowing air flow towards the soot collection box (511); A first air outlet plate (513) covering the air outlet of the first blowing channel (512), and a plurality of first air outlet holes (514) are arranged on the first air outlet plate (513) along the length and width directions of the first air outlet plate (513), and the first air outlet holes (514) communicate the printing and forming chamber (2) and the first blowing channel (512).

3. The ventilation system for a 3D printing device according to claim 2, characterized in that, The apertures of the plurality of first air outlet holes (514) gradually increase from top to bottom.

4. The ventilation system applied to a 3D printing device according to claim 2, characterized in that, The soot collection box (511) includes: A smoke collection box body (5111) with a smoke inlet (53) facing the first blowing channel (512) provided on the side wall of the smoke collection box body (5111), and a smoke outlet (54) provided at one end of the smoke collection box body (5111); A smoke collection plate (5112) bending and extending along the smoke inlet (53) towards the smoke outlet (54) direction, and a plurality of the smoke collection plates (5112) are arranged along the length direction of the smoke inlet (53); A smoke collection channel (5113) with one end communicating with the smoke outlet (54) and the other end extending outside the printing and forming chamber (2).

5. A ventilation system applied to a 3D printing device according to claim 1, characterized in that, The second air outlet plate (522) includes an air outlet installation part (5221) installed on the inner wall of the printing and forming chamber (2), and a conical wind gathering cavity (5222) extending along the air outlet installation part (5221) away from the second blowing channel (521), and the second air outlet holes (523) are arranged on the end face of the conical wind gathering cavity (5222).

6. The ventilation system for a 3D printing device according to claim 1, characterized in that, It further includes a powder spreading and feeding structure, and the powder spreading and feeding structure includes: A powder feeding bin (31) arranged above the frame (1) for storing powder; The powder feeding connecting member (32) is used to connect the machine frame (1) and the powder feeding bin (31). An accommodating cavity (33), a feeding port (34) communicating the accommodating cavity (33) and the powder feeding bin (31), and a discharging port (35) communicating the accommodating cavity (33) and the printing and forming bin (2) are provided on the powder feeding connecting member (32). The powder in the powder feeding bin (31) can fall into the printing and forming bin (2) through the accommodating cavity (33). The powder falling control mechanism (36) is arranged in the accommodating cavity (33) and is used to block the powder from falling from the powder feeding bin (31) into the printing and forming bin (2), or to quantitatively convey the powder in the powder feeding bin (31) into the printing and forming bin (2).

7. The ventilation system applied to a 3D printing device according to claim 6, wherein, The powder falling control mechanism (36) includes: A rotating roller (361) rotatably arranged in the accommodating cavity (33) for blocking the powder from falling from the powder feeding bin (31) into the printing and forming bin (2). A powder feeding groove (362) axially arranged on the outer side wall of the rotating roller (361) along the rotating roller (361). A rotating driving member (363) is used to drive the rotating roller (361) to rotate, and the rotating roller (361) can rotate to make the powder feeding groove (362) communicate with the feeding port (34) or the discharging port (35).

8. A ventilation system applied to a 3D printing device according to claim 7, characterized in that, A powder spreading mechanism (39) and two oppositely arranged powder guiding plates (310) are arranged in the printing and forming bin (2). A powder guiding channel (3101) is formed between the two powder guiding plates (310). One end of the powder guiding channel (3101) communicates with the discharging port (35), and the other end extends towards the powder spreading mechanism (39) for conveying the powder onto the powder spreading mechanism (39).

9. The ventilation system for a 3D printing device according to claim 8, characterized in that, The powder spreading mechanism (39) includes: A first mounting plate (391) movably arranged in the printing and forming bin (2). A second mounting plate (392) is arranged on one side of the first mounting plate (391), and a powder spreading cavity (315) is formed between the second mounting plate (392) and the first mounting plate (391), and a powder spreading port (318) communicating with the powder spreading cavity (315) and located below the powder spreading cavity (315). The powder spreading cavity (315) is conical. A powder spreading driving assembly (393) is arranged in the printing and forming bin (2) for driving the first mounting plate (391) to reciprocate. A scraper (394) is arranged on the side of the first mounting plate (391) away from the second mounting plate (392), and one end extends below the first mounting plate (391). [[ID=

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