Swinging powder spreading structure and 3D printing device

Abstract

The utility model belongs to the technical field of 3D printing, and particularly relates to a swing powder spreading structure and a 3D printing device, which comprise a rack provided with a printing forming bin, a printing platform arranged in the printing forming bin, a powder spreading mechanism and two powder feeding mechanisms oppositely arranged on two sides of the powder spreading mechanism, the powder spreading mechanism comprises a swing powder spreading piece rotationally arranged in the printing forming bin and a powder spreading driving piece used for driving the swing powder spreading piece to swing in a reciprocating mode in the horizontal circumferential direction, and when the powder spreading device is used, the swing powder spreading piece is opposite to a discharging opening of the powder feeding mechanism on one side so as to receive powder; and then the powder spreading driving piece drives the swinging powder spreading piece to swing in the horizontal circumferential direction to be opposite to the discharging opening of the powder feeding mechanism on the other side so as to receive the powder, powder spreading can be conducted twice through one-time reciprocating swinging, the stroke of circumferential swinging is shorter, and the powder spreading efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of 3D printing, and in particular relates to a swing powder spreading structure and a 3D printing device. Background Art

[0002] 3D printing is a high-tech manufacturing technology based on material accumulation. Based on computer-designed three-dimensional model data, forming equipment can create complex shapes that are difficult to achieve using traditional methods by adding materials. It uses powder materials such as ceramic powder and metal powder for forming. Existing 3D printers use two different powder feeding methods: bottom feeding (using a powder cylinder) and top dropping (using a hopper). For the same print format, the top dropping method saves cylinder space, thereby reducing the overall machine footprint.

[0003] Existing 3D printers that use a powder loading and unloading method typically have the powder spreading mechanism docked at one end of the forming print surface (for example, the left side, which will be used as an example below for ease of explanation). When printing begins, a motor-driven conveyor line typically drives the powder spreading mechanism in a linear reciprocating motion. The powder spreading mechanism loads powder from the left side and then moves to the right to sprinkle and spread powder. After spreading powder, the powder spreading mechanism travels an idle stroke back to the left docking position before reloading. This means that each reciprocating motion only spreads powder once, and the long reciprocating motion leads to low powder spreading efficiency. Summary of the Invention

[0004] The purpose of the utility model is to provide a swing powder spreading structure and a 3D printing device with high powder spreading efficiency.

[0005] The utility model is realized by the following technical solutions:

[0006] A swing powder spreading structure, comprising:

[0007] A frame is provided with a printing and molding chamber, wherein a printing platform is provided in the printing and molding chamber;

[0008] A powder spreading mechanism, comprising a swinging powder spreading member rotatably disposed within the printing and forming chamber, and a powder spreading driving member for driving the swinging powder spreading member to swing back and forth in a horizontal circumferential direction;

[0009] The powder loading mechanism, the two powder loading mechanisms are relatively arranged on both sides of the swinging powder spreading part. When the powder spreading driving part drives the swinging powder spreading part to swing along the horizontal circumferential direction to be opposite to the discharge port of the powder loading mechanism, the powder loading mechanism transports the powder to the corresponding swinging powder spreading part.

[0010] As described above, the swing powder spreading structure comprises:

[0011] A powder spreading member body, one end of which is connected to the rotation output end of the powder spreading drive member;

[0012] A powder spreading cavity, which is arranged on the main body of the powder spreading part and is used to receive the powder conveyed by the powder feeding mechanism;

[0013] A powder spreading port, which is arranged at the bottom of the main body of the powder spreading part and is communicated with the powder spreading cavity. The powder spreading driving part can drive the main body of the powder spreading part to swing circumferentially horizontally so that the powder spreading cavity is opposite to the discharge port of the powder feeding mechanism to receive the powder conveyed by the powder feeding mechanism. When the main body of the powder spreading part swings back and forth circumferentially horizontally, the powder in the powder spreading cavity is laid on the printing platform through the powder spreading port.

[0014] As described above, for a swing powder spreading structure, there are two powder spreading cavities, and the two powder spreading cavities are arranged side by side on the main body of the powder spreading part. The powder spreading driving part can drive the main body of the powder spreading part to swing back and forth circumferentially horizontally so that the two powder spreading cavities are respectively opposite to the discharge ports of the two powder feeding mechanisms.

[0015] As described above, for a swing powder spreading structure, powder collecting grooves are relatively arranged on both sides of the swing powder spreading part on the printing platform, and the two powder collecting grooves are respectively opposite to the discharge ports of the two powder feeding mechanisms.

[0016] As described above, for a swing powder spreading structure, the powder feeding mechanism includes:

[0017] A powder feeding bin, which is arranged above the frame and is used to store powder;

[0018] A powder feeding connecting piece, which is used to connect the frame and the powder feeding bin. The powder feeding connecting piece is provided with a containing cavity, a feeding port communicating the containing cavity and the powder feeding bin, and a discharge port communicating the containing cavity and the printing and forming bin. The powder in the powder feeding bin can fall into the printing and forming bin through the containing cavity.

[0019] As described above, for a swing powder spreading structure, the powder feeding connecting piece is provided with a filter plate and a filter plate installation groove for embedding the filter plate, and the filter plate installation groove is respectively communicated with the powder feeding bin and the feeding port.

[0020] As described above, for a swing powder spreading structure, the powder feeding bin includes a bin body, a powder inlet arranged at the upper end of the bin body, a powder outlet arranged at the lower end of the bin body, and a transparent viewing window arranged on the side wall of the bin body. Two relatively arranged powder guiding plates are arranged in the printing and forming bin, and a powder guiding channel is formed between the two powder guiding plates. One end of the powder guiding channel is communicated with the discharge port and the other end extends towards the direction close to the powder spreading mechanism for conveying the powder to the powder spreading mechanism.

[0021] A 3D printing device, including the swing powder spreading structure described in any one of the above, further includes:

[0022] A soot collection mechanism, which is arranged above the printing platform and is used to collect the black smoke generated on the printing platform during the printing process;

[0023] The blowing and smoke-blocking mechanism is arranged above the soot collection mechanism and is used to blow 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.

[0024] As described above, in a 3D printing device, the soot collection mechanism includes:

[0025] A soot collection box, which is arranged in the printing and forming chamber and on one side of the printing platform;

[0026] A first blowing channel, which is arranged opposite to the soot collection box on the other side of the printing platform, 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;

[0027] A first air outlet plate, which 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 the 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.

[0028] As described above, in a 3D printing device, the blowing and smoke-blocking mechanism includes:

[0029] 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;

[0030] A second air outlet plate, which covers the air outlet of the second blowing channel, and a plurality of second air outlet holes are arranged on the second air outlet plate along the length direction and the width direction of the second air outlet plate, and the second air outlet holes communicate the printing and forming chamber and the second blowing channel.

[0031] Compared with the prior art, the present utility model has the following advantages:

[0032] The present utility model provides a swing powder spreading structure, which includes a frame provided with a printing and forming chamber, a printing platform arranged in the printing and forming chamber, a powder spreading mechanism, and two powder feeding mechanisms oppositely arranged on both sides of the powder spreading mechanism. The powder spreading mechanism includes a swing powder spreading member rotatably arranged in the printing and forming chamber and a powder spreading driving member for driving the swing powder spreading member to swing reciprocally along the horizontal circumferential direction. During use, the swing powder spreading member is opposite to the discharge port of one powder feeding mechanism to receive powder, and then the powder spreading driving member drives the swing powder spreading member to swing along the horizontal circumferential direction to be opposite to the discharge port of the other powder feeding mechanism to receive powder. One reciprocating swing can perform powder spreading twice, and the swing stroke along the circumferential direction is shorter, and the powder spreading efficiency is high. Description of the Drawings

[0033] 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 description in the embodiments.

[0034] Figure 1It is a schematic structural diagram of the 3D printing device in the specific embodiment of the present utility model;

[0035] Figure 2 It is a schematic structural diagram of the 3D printing device in the specific embodiment of the present utility model;

[0036] Figure 3 It is a schematic cross-sectional structural diagram of the 3D printing device in the specific embodiment of the present utility model;

[0037] Figure 4 It is a schematic cross-sectional structural diagram of the 3D printing device in the specific embodiment of the present utility model;

[0038] Figure 5 is Figure 4 a partial enlarged view of a in Specific embodiment

[0039] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer and more understandable, the present utility model 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 only used to explain the present utility model and are not used to limit the present utility model.

[0040] When the embodiments of the present utility model mention ordinal numbers such as "first" and "second", unless they actually express an order meaning according to the context, they should be understood as merely for distinction.

[0041] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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.

[0042] Specific embodiment, such as Figures 1-5A swing powder spreading structure and a 3D printing device are shown, including: a frame 1, which is provided with a printing and forming chamber 2, and a printing platform 4 is arranged in the printing and forming chamber 2; a powder spreading mechanism 39, the powder spreading mechanism 39 includes a swing powder spreading member 391 rotatably arranged in the printing and forming chamber 2, and a powder spreading driving member 392 for driving the swing powder spreading member 391 to swing reciprocally along the horizontal circumferential direction; a powder feeding mechanism, two of the powder feeding mechanisms are oppositely arranged on both sides of the swing powder spreading member 391. When the powder spreading driving member 392 drives the swing powder spreading member 391 to swing along the horizontal circumferential direction to be opposite to the discharge port 35 of the powder feeding mechanism, the powder feeding mechanism transports powder into the printing and forming chamber 2. During use, the swing powder spreading member is opposite to the discharge port of one side powder feeding mechanism to receive powder, and then the powder spreading driving member drives the swing powder spreading member to swing along the horizontal circumferential direction to be opposite to the discharge port of the other side powder feeding mechanism to receive powder. One reciprocating swing can perform powder spreading twice, and the circumferential swing stroke is shorter, and the powder spreading efficiency is high. Specifically, the powder spreading driving member 392 is a rotating motor, and its rotating output end directly drives the swing powder spreading member 391 to swing, which is more efficient than using a motor to drive a conveyor line to drive the powder spreading mechanism to move linearly back and forth. Optionally, the powder feeding mechanism can adopt the powder feeding and discharging structure in the utility model patent with the publication number CN210969946U.

[0043] Specifically, the swing powder spreading member 391 includes: a powder spreading member body 3911, one end of which is connected to the rotating output end of the powder spreading driving member 392; a powder spreading chamber 3912, which is arranged on the powder spreading member body 3911 and is used for receiving powder conveyed by the quantitative powder feeding mechanism; a powder spreading port 3913, which is arranged at the bottom of the powder spreading member body 3911 and is communicated with the powder spreading chamber 3912. The powder spreading driving member 392 can drive the powder spreading member body 3911 to swing along the horizontal circumferential direction until the powder spreading chamber 3912 is opposite to the discharge port 35 of the quantitative powder feeding mechanism to receive powder conveyed by the quantitative powder feeding mechanism. When the powder spreading member body 3911 swings reciprocally along the horizontal circumferential direction, the powder in the powder spreading chamber 3912 is laid on the printing platform 4 through the powder spreading port 3913.

[0044] In addition, there are two powder spreading chambers 3912, and the two powder spreading chambers 3912 are arranged side by side on the powder spreading member body 3911. The powder spreading driving member 392 can drive the powder spreading member body 3911 to swing reciprocally along the horizontal circumferential direction until the two powder spreading chambers 3912 are respectively opposite to the discharge ports 35 of the two quantitative powder feeding mechanisms. The efficiency is higher.

[0045] Specifically, powder collecting grooves 6 are oppositely arranged on both sides of the swing powder spreading member 391 on the printing platform 4, and the two powder collecting grooves 6 are respectively opposite to the discharge ports 35 of the two quantitative powder feeding mechanisms. It is convenient to collect powder.

[0046] Further, the powder feeding mechanism 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 to connect the 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 arranged on the powder feeding connecting piece 32. 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 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. During use, the powder in the powder feeding bin is quantitatively conveyed into the printing and forming bin through the powder falling control mechanism. 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 and 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.

[0047] More specifically, the powder falling control mechanism 36 includes: a rotating roller 361, which is rotatably arranged in the accommodating cavity 33 and used to block 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 to drive the rotating roller 361 to rotate. 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. The rotating roller 361 blocks 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. Then, when the rotating driving part 363 drives the rotating roller 361 to rotate until the powder feeding groove 362 communicates with the discharging port 35, 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 the conveying to block the powder from falling from the powder feeding bin into the printing and forming bin, avoiding excessive powder falling and 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 rotates to stir and convey the powder, with higher conveying efficiency and can avoid material jamming. Optionally, the rotating driving part 363 is a rotating motor.

[0048] Further, to improve the powder feeding efficiency, a plurality of the powder feeding grooves 362 are arranged equidistantly along the circumferential direction of the rotating roller 361. To ensure that when one of the powder feeding grooves 362 is opposite to the feeding port 34, another powder feeding groove 362 is opposite to the discharging port 35.

[0049] Further, a filter plate 37 and a filter plate installation groove 38 for embedding the filter plate 37 are provided on the powder feeding connecting member 32. The filter plate installation groove 38 is respectively communicated with the powder feeding 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, and the powder feeding is more uniform.

[0050] More specifically, the powder feeding 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.

[0051] Further, 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 discharge port 35, and the other end extends towards the powder collecting tank 6, 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.

[0052] Still further, the present application also discloses a 3D printing device, including the swing powder spreading structure as described above, and further including: a soot collection mechanism 51, which is provided 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, which is provided 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 bin 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 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 bin, which not only prevents the top of the printing and forming bin 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.

[0053] 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 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 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 direction and width direction 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. By sending air flow to the first blowing channel 512 through a blower, the air flow exits from the first air outlet holes 514 of the first air outlet plate 513 and blows the black smoke generated by the combustion or thermal decomposition of the powder on the printing platform to the soot collection box 511 for collection.

[0054] In addition, the aperture diameters of the plurality of 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.

[0055] 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 are arranged on the second air outlet plate 522 along the length direction and width direction 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. By using a blower to send air to the second blowing channel 521, the air flow exits from the second air outlet holes 523 of the second air outlet plate 522 to form an air 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.

[0056] 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, nor to the English names. Any method, structure, etc. that is approximate or identical to the present invention, or any technical deduction or replacement made under the premise of the inventive concept of the present invention, should be regarded as the protection scope of the present invention.

Claims

1. A swing powder spreading structure, characterized in that, Comprising: 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 powder spreading mechanism (39), the powder spreading mechanism (39) includes a swinging powder spreading member (391) rotatably arranged in the printing and forming chamber (2), and a powder spreading driving member (392) for driving the swinging powder spreading member (391) to reciprocally swing horizontally in a circumferential direction; A powder feeding mechanism, two of the powder feeding mechanisms are oppositely arranged on both sides of the swinging powder spreading member (391), when the powder spreading driving member (392) drives the swinging powder spreading member (391) to swing horizontally in a circumferential direction to be opposite to the discharge port (35) of the powder feeding mechanism, the powder feeding mechanism conveys powder into the corresponding swinging powder spreading member (391).

2. The swing powder spreading structure according to claim 1, characterized in that, The swinging powder spreading member (391) includes: A powder spreading member body (3911), one end of which is connected to the rotational output end of the powder spreading driving member (392); A powder spreading cavity (3912), which is arranged on the powder spreading member body (3911) and is used for receiving the powder conveyed by the powder feeding mechanism; A powder spreading port (3913), which is arranged at the bottom of the powder spreading member body (3911) and is communicated with the powder spreading cavity (3912), the powder spreading driving member (392) can drive the powder spreading member body (3911) to swing horizontally in a circumferential direction so that the powder spreading cavity (3912) is opposite to the discharge port (35) of the powder feeding mechanism to receive the powder conveyed by the powder feeding mechanism, when the powder spreading member body (3911) reciprocally swings horizontally in a circumferential direction, the powder in the powder spreading cavity (3912) is laid on the printing platform (4) through the powder spreading port (3913).

3. The swing powder spreading structure according to claim 2, characterized in that, There are two powder spreading cavities (3912), and the two powder spreading cavities (3912) are arranged side by side on the powder spreading member body (3911), and the powder spreading driving member (392) can drive the powder spreading member body (3911) to reciprocally swing horizontally in a circumferential direction so that the two powder spreading cavities (3912) are respectively opposite to the discharge ports (35) of the two powder feeding mechanisms.

4. A swing powder spreading structure according to claim 1, characterized in that, On the printing platform (4) and opposite to both sides of the swinging powder spreading member (391), powder collecting grooves (6) are oppositely arranged, and the two powder collecting grooves (6) are respectively opposite to the discharge ports (35) of the two powder feeding mechanisms.

5. The oscillating powder spreading structure according to claim 1, characterized in that, The powder feeding mechanism includes: A powder feeding bin (31), which is arranged above the frame (1) and is used for storing powder; A powder feeding connecting member (32), which is used for connecting the 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 discharge port (35) communicating the accommodating cavity (33) and the printing and forming chamber (2) are arranged on the powder feeding connecting member (32), and the powder in the powder feeding bin (31) can fall into the printing and forming chamber (2) through the accommodating cavity (33).

6. The swing powder spreading structure according to claim 5, wherein, A filter plate (37) and a filter plate mounting groove (38) for embedding the filter plate (37) are arranged on the powder feeding connecting member (32), and the filter plate mounting groove (38) is respectively communicated with the powder feeding bin (31) and the feeding port (34).

7. A swing powder spreading structure according to claim 5, characterized in that, The powder feeding 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). 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 discharge port (35), and the other end extends towards the powder spreading mechanism (39) for conveying the powder onto the powder spreading mechanism (39).

8. A 3D printing device, characterized in that, Comprising the swing powder spreading structure according to any one of claims 1-7, further comprising: A soot collection mechanism (51) provided 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) provided 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 bin (2).

9. A 3D printing device according to claim 8, wherein, The soot collection mechanism (51) includes: A soot collection box (511) provided in the printing and forming bin (2) and located on one side of the printing platform (4); A first blowing channel (512) oppositely provided with the soot collection box (511) on the other side of the printing platform (4). The air outlet of the first blowing channel (512) is communicated with the printing and forming bin (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). A plurality of first air outlet holes (514) are provided on the first air outlet plate (513) and arranged along the length and width directions of the first air outlet plate (513). The first air outlet holes (514) communicate the printing and forming bin (2) and the first blowing channel (512).

10. A 3D printing device according to claim 8, characterized in that, The blowing and smoke blocking mechanism (52) includes: A second blowing channel (521) with one end communicated with the printing and forming bin (2) and the other end extending out of the printing and forming bin (2); A second air outlet plate (522) covering the air outlet of the second blowing channel (521). A plurality of second air outlet holes (523) are provided on the second air outlet plate (522) and arranged along the length and width directions of the second air outlet plate (522). The second air outlet holes (523) communicate the printing and forming bin (2) and the second blowing channel (521).

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