3D printing powder spreading and feeding structure

Abstract

The utility model belongs to the technical field of 3D printing, and particularly relates to a 3D printing powder spreading and feeding structure which comprises a machine frame provided with a printing forming bin, a powder feeding bin arranged above the machine frame, a powder feeding connecting piece used for connecting the machine frame and the powder feeding bin and a powder falling control mechanism, and a containing cavity, a feeding port and a discharging port are formed in the powder feeding connecting piece. Powder in the powder feeding bin is quantitatively conveyed into the printing forming bin through the powder falling control mechanism, the powder falling control mechanism can prevent the powder from falling into the printing forming bin from the powder feeding bin in time after the needed powder amount is enough, the situation that powder needs to be collected again due to the fact that the powder falling amount is too large is avoided, the printing efficiency is guaranteed, and meanwhile the situation that the printing forming quality is affected due to the insufficient powder falling amount is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of 3D printing, and particularly relates to a 3D printing powder spreading and feeding structure.

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 through a forming device in a material accumulation manner. It uses powder materials for forming, such as ceramic powder and metal powder. The existing powder feeding methods of 3D printers are divided into the lower powder feeding (powder feeding cylinder powder feeding) method and the upper powder falling (funnel groove powder falling) method. Under the condition of the same printing area, the upper powder falling method is more conducive to saving the cylinder space than the lower powder feeding method, thereby reducing the floor area of the whole machine. For example, the powder spreading and feeding structure of a multi-purpose 3DP printing device disclosed in the patent with the publication number of CN210969946U feeds powder through an upper powder bin and a powder guiding plate. The powder in the upper powder bin directly falls into the powder spreading mechanism through the powder guiding plate by its own gravity, and the powder falling amount cannot be accurately and timely controlled, resulting in too much powder falling, which needs to be re-collected and affects the efficiency, or the powder falling amount is insufficient, affecting the printing forming quality.

Content of the Utility Model

[0003] The purpose of the utility model is to provide a 3D printing powder spreading and feeding structure that can quantitatively transport powder and ensure the printing efficiency and printing forming quality.

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

[0005] A 3D printing powder spreading and feeding structure includes:

[0006] A frame provided with a printing and forming chamber;

[0007] An upper powder bin arranged above the frame for storing powder;

[0008] An upper powder connecting piece for connecting the frame and the upper powder bin. The upper powder connecting piece is provided with a receiving cavity, a feeding port communicating the receiving cavity and the upper powder bin, and a discharging port communicating the receiving cavity and the printing and forming chamber. The powder in the upper powder bin can fall into the printing and forming chamber through the receiving cavity;

[0009] A powder falling control mechanism arranged in the receiving cavity for blocking the powder from falling from the upper powder bin into the printing and forming chamber, or for quantitatively transporting the powder in the upper powder bin into the printing and forming chamber.

[0010] As the above-mentioned 3D printing powder spreading and feeding structure, the powder falling control mechanism includes:

[0011] A rotating roller rotatably arranged in the receiving cavity for blocking the powder from falling from the upper powder bin into the printing and forming chamber;

[0012] A powder feeding trough, which is arranged on the outer side wall of the rotating roller along the axial direction of the rotating roller;

[0013] A rotation driving member, which is used to drive the rotation of the rotating roller, and the rotating roller can rotate to connect the powder feeding trough with the feeding port or the discharging port.

[0014] For a 3D printing powder spreading and feeding structure as described above, a plurality of the powder feeding troughs are arranged at equal intervals along the circumferential direction of the rotating roller.

[0015] For a 3D printing powder spreading and feeding structure as described above, a filter plate and a filter plate installation groove for embedding the filter plate are provided on the powder feeding connecting member, and the filter plate installation groove is respectively communicated with the powder feeding bin and the feeding port.

[0016] For a 3D printing powder spreading and feeding structure as described above, the powder feeding bin includes a bin body, a powder feeding port arranged at the upper end of the bin body, a powder discharging port arranged at the lower end of the bin body, and a transparent viewing window arranged on the side wall of the bin body.

[0017] For a 3D printing powder spreading and feeding structure as described above, 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 transporting the powder onto the powder spreading mechanism.

[0018] For a 3D printing powder spreading and feeding structure as described above, the powder spreading mechanism includes:

[0019] A first mounting plate, which is movably arranged in the printing and forming bin;

[0020] A second mounting plate, which is arranged on one side of the first mounting plate and forms a powder spreading cavity and a powder spreading port communicated with the powder spreading cavity and located below the powder spreading cavity between the first mounting plate and the second mounting plate, and the powder spreading cavity is conical;

[0021] A powder spreading driving assembly, which is arranged in the printing and forming bin and is used to drive the first mounting plate to reciprocate.

[0022] For a 3D printing powder spreading and feeding structure as described above, the powder spreading driving assembly includes:

[0023] A powder spreading driving guide rail, which is horizontally arranged in the printing and forming bin;

[0024] A powder spreading driving slider, which is horizontally movably arranged on the powder spreading driving guide rail, and the first mounting plate is arranged on the powder spreading driving slider;

[0025] A powder spreading driving member, which is used to drive the powder spreading driving slider to reciprocate horizontally.

[0026] As described above, a powder spreading and feeding structure for 3D printing, the powder spreading mechanism further includes:

[0027] A doctor blade, which is arranged on the side of the first mounting plate away from the second mounting plate, and one end extends below the first mounting plate;

[0028] A third mounting plate, which is arranged on the side of the first mounting plate away from the second mounting plate and is used for fixedly mounting the doctor blade.

[0029] As described above, a powder spreading and feeding structure for 3D printing, the first mounting plate is provided with a plurality of first mounting holes arranged along the length direction, the third mounting plate is provided with a plurality of second mounting holes corresponding to the first mounting holes, and the second mounting holes are kidney-shaped holes arranged along the vertical direction.

[0030] Compared with the prior art, the present utility model has the following advantages:

[0031] The present utility model provides a powder spreading and feeding structure for 3D printing, including a frame provided with a printing and forming chamber, a powder feeding chamber arranged above the frame, a powder feeding connecting piece for connecting the frame and the powder feeding chamber, and a powder falling control mechanism. The powder feeding connecting piece is provided with a receiving cavity, a feeding port and a discharging port. During use, the powder falling control mechanism quantitatively conveys the powder in the powder feeding chamber to the printing and forming chamber, 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 chamber into the printing and forming chamber, 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 and affecting the printing forming quality.

BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below.

[0033] Figure 1 It is a schematic structural diagram of the powder spreading and feeding structure for 3D printing in the specific embodiment of the present utility model;

[0034] Figure 2 It is a schematic structural diagram of the powder spreading and feeding structure for 3D printing in the specific embodiment of the present utility model;

[0035] Figure 3 It is a schematic cross-sectional structural diagram of the powder spreading and feeding structure for 3D printing in the specific embodiment of the present utility model;

[0036] Figure 4 For Figure 3 The partial enlarged view of a in;

[0037] Figure 5 It is a partial exploded structural diagram of the powder spreading mechanism in the specific embodiment of the present utility model. [[ID=!43]]

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] 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.

[0039] When ordinal numbers such as "first" and "second" are mentioned in the embodiments of the present utility model, unless they actually express the meaning of order according to the context, they should be understood as merely for distinction.

[0040] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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.

[0041] Specific embodiments, such as Figures 1-5 A powder feeding structure for 3D printing powder spreading as shown, including: a frame 1 provided with a printing and forming chamber 2; a powder feeding chamber 31 provided above the frame 1 for storing powder; a powder feeding connecting member 32 for connecting the frame 1 and the powder feeding chamber 31, the powder feeding connecting member 32 is provided with a receiving cavity 33, a feeding port 34 communicating the receiving cavity 33 and the powder feeding chamber 31, and a discharging port 35 communicating the receiving cavity 33 and the printing and forming chamber 2, and the powder in the powder feeding chamber 31 can fall into the printing and forming chamber 2 through the receiving cavity 33; a powder falling control mechanism 36 provided in the receiving cavity 33 for blocking the powder from falling from the powder feeding chamber 31 into the printing and forming chamber 2, or for quantitatively conveying the powder in the powder feeding chamber 31 into the printing and forming chamber 2. During use, the powder falling control mechanism quantitatively conveys the powder in the powder feeding chamber into the printing and forming chamber, 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 chamber into the printing and forming chamber, 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 and affecting the printing forming quality.

[0042] Specifically, the powder dropping control mechanism 36 includes: a rotating roller 361 rotatably disposed in the accommodating cavity 33 for blocking powder from falling from the powder feeding bin 31 into the printing and forming bin 2; a powder feeding groove 362 axially disposed on the outer sidewall of the rotating roller 361 along the axial direction of the rotating roller 361; a rotating driving member 363 for driving the rotating roller 361 to rotate, and the rotating roller 361 can rotate to connect the powder feeding groove 362 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 member 363 drives the rotating roller 361 to rotate until the powder feeding groove 362 is connected with the feeding port 34, the powder in the powder feeding bin 31 falls into the powder feeding groove 362. Then, by driving the rotating roller 361 to rotate until the powder feeding groove 362 is connected with the discharging port 35 by the rotating driving member 363, the powder in the powder feeding groove 362 can be sent to the printing and forming bin 2 through the discharging port 35. The powder delivery amount each time is the amount accommodated in the powder feeding groove 362. The rotating driving member 363 drives the rotating roller 361 to continuously rotate, realizing quantitative powder delivery, and can stop the delivery in time, blocking the powder from falling from the powder feeding bin into the printing and forming bin, avoiding excessive powder dropping, resulting in the need to re-collect the powder, ensuring the printing efficiency, and at the same time avoiding insufficient powder dropping 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 member 363 is a rotating motor.

[0043] 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 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.

[0044] 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, and the filter plate installation groove 38 is respectively communicated with the powder feeding bin 31 and the feeding port 34. The powder falls into the printing and forming bin 2 after passing through the filter holes of the filter plate 37, and the powder feeding is more uniform.

[0045] 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 sidewall 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.

[0046] Further, a powder spreading mechanism 39 and two oppositely arranged powder guiding plates 310 are provided in the printing and forming chamber 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 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.

[0047] Still further, the powder spreading mechanism 39 includes: a first mounting plate 391 movably provided in the printing and forming chamber 2; a second mounting plate 392 provided 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 communicated with the powder spreading cavity 315 and located below the powder spreading cavity 315. The powder spreading cavity 315 is in a conical shape; a powder spreading driving assembly 393 provided in the printing and forming chamber 2 for driving the first mounting plate 391 to reciprocate.

[0048] Specifically, the powder spreading driving assembly 393 includes: a powder spreading driving guide rail 3931 horizontally arranged in the printing and forming chamber 2; a powder spreading driving slider 3932 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 for driving 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 to drive a conveyor line.

[0049] More specifically, the powder spreading mechanism 39 further includes: a scraper 394 provided 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 provided on the side of the first mounting plate 391 away from the second mounting plate 392 for fixedly mounting the scraper 394. Using the scraper 394 makes the powder spreading on the printing platform more uniform and thinner.

[0050] 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 connecting bolts, and the second mounting holes 317 are kidney-shaped holes arranged along the vertical direction, so that the position of the scraper 394 in the vertical direction can be adjusted.

[0051] As described above, an implementation manner is provided in combination with specific content. It is not considered that the specific implementation of the present utility model is limited to these descriptions only. At the same time, due to different industry names, it is not limited to the above names, nor is it limited to English names. Any method, structure, etc. that is similar or identical to the present utility model, or any technical deduction or replacement made under the premise of the concept of the present utility model, shall be regarded as the protection scope of the present utility model.

Claims

1. A powder spreading and feeding structure for 3D printing, characterized in that, Comprising: A frame (1) provided with a printing and forming chamber (2); A powder feeding hopper (31) disposed above the frame (1) for storing powder; A powder feeding connecting member (32) for connecting the frame (1) and the powder feeding hopper (31), the powder feeding connecting member (32) being provided with a receiving cavity (33), a feeding port (34) communicating the receiving cavity (33) and the powder feeding hopper (31), and a discharging port (35) communicating the receiving cavity (33) and the printing and forming chamber (2), and the powder in the powder feeding hopper (31) can fall into the printing and forming chamber (2) through the receiving cavity (33); A powder falling control mechanism (36) disposed in the receiving cavity (33) for blocking the powder from falling from the powder feeding hopper (31) into the printing and forming chamber (2), or for quantitatively conveying the powder in the powder feeding hopper (31) into the printing and forming chamber (2).

2. The 3D printing powder spreading and feeding structure according to claim 1, wherein, The powder falling control mechanism (36) includes: A rotating roller (361) rotatably disposed in the receiving cavity (33) for blocking the powder from falling from the powder feeding hopper (31) into the printing and forming chamber (2); A powder feeding groove (362) axially disposed along the rotating roller (361) on the outer sidewall of the rotating roller (361); A rotation driving member (363) for driving the rotating roller (361) to rotate, and the rotating roller (361) can rotate to connect the powder feeding groove (362) with the feeding port (34) or the discharging port (35).

3. The 3D printing powder spreading and feeding structure according to claim 2, characterized in that, A plurality of the powder feeding grooves (362) are equidistantly arranged along the circumferential direction of the rotating roller (361).

4. A 3D printing powder spreading and feeding structure according to claim 1, characterized in that, The powder feeding connecting member (32) is provided with a filter plate (37) and a filter plate mounting groove (38) for embedding the filter plate (37), and the filter plate mounting groove (38) is respectively communicated with the powder feeding hopper (31) and the feeding port (34).

5. A 3D printing powder spreading and feeding structure according to claim 1, characterized in that, The powder feeding hopper (31) includes a hopper body (311), a powder inlet (312) provided at the upper end of the hopper body (311), a powder outlet (313) provided at the lower end of the hopper body (311), and a transparent viewing window (314) provided on the sidewall of the hopper body (311).

6. A 3D printing powder spreading and feeding structure according to claim 1, characterized in that, A powder spreading mechanism (39) and two oppositely arranged powder guiding plates (310) are provided in the printing and forming chamber (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 conveying the powder onto the powder spreading mechanism (39).

7. The 3D printing powder spreading and feeding structure according to claim 6, characterized in that, The powder spreading mechanism (39) includes: A first mounting plate (391) movably disposed in the printing and forming chamber (2); A second mounting plate (392) disposed 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) communicated with the powder spreading cavity (315) and located below the powder spreading cavity (315), and the powder spreading cavity (315) is in a conical shape; A powder spreading driving assembly (393) disposed in the printing and forming chamber (2) for driving the first mounting plate (391) to reciprocate.

8. A 3D printing powder spreading and feeding structure according to claim 7, characterized in that, The powder spreading driving assembly (393) includes: A powder spreading driving guide rail (3931) horizontally disposed in the printing and forming chamber (2); The powder spreading driving slider (3932) 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); The powder spreading driving member (3933) is used for driving the powder spreading driving slider (3932) to reciprocate horizontally.

9. The 3D printing powder spreading and feeding structure according to claim 7, characterized in that The powder spreading mechanism (39) further includes: 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); The third mounting plate (395) is arranged on the side of the first mounting plate (391) away from the second mounting plate (392) and is used for fixedly mounting the scraper (394).

10. A 3D printing powder spreading and feeding structure according to claim 9, characterized in that, A plurality of first mounting holes (316) are arranged on the first mounting plate (391) along the length direction, and a plurality of second mounting holes (317) corresponding to the first mounting holes (316) are arranged on the third mounting plate (395). The second mounting holes (317) are kidney-shaped holes arranged along the vertical direction.

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