Downward pressing type powder falling mechanism and 3D printer
By using a down-pressure powder drop mechanism in the 3D printing equipment, the power mechanism is used to control the gap between the powder dropping block and the frame, so that the powder can fall into powder through the gap, solving the problems of high energy consumption and powder jam in the prior art, and achieving a more uniform and efficient powder drop process.
Patent Information
- Application Number
- CN202420622191.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-03-28
AI Technical Summary
The powder roller shaft powder drop structure in existing 3D printing equipment requires large torque drive, resulting in high energy consumption and prone to powder jamming.
The down-pressure powder dropping mechanism is adopted to drive the movement of the powder diversion block through the power mechanism, control the gap between the powder diversion block and the frame, so that the powder can fall into powder through the gap, instead of the powder roller shaft to prevent the powder from being stuck.
The power required for powder loss is reduced, the powder is blocked, and the uniformity of powder loss is improved.
Smart Images
Figure CN222679548U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of 3D printing equipment, in particular to a downward pressure powder dropping mechanism. Background Art
[0002] Selective laser melting metal 3D printing technology is a process of melting layers of metal powder to obtain a formed part. After each layer is melted, the melting platform descends, and new powder is spread over the layer to repeat the above melting process. This process is repeated to obtain a formed part.
[0003] At present, the powder dropping structure in 3D printing equipment adopts a powder roller shaft structure, and powder dropping is achieved by rotating the powder roller shaft. Due to the long length of the powder roller shaft, a large torque driving component is required to provide kinetic energy during powder dropping, resulting in high energy consumption. In addition, during the powder dropping process of the powder roller shaft, the powder on the powder roller shaft rotates synchronously with the powder roller shaft, and part of the powder will slide into the gap between the outer periphery of the powder roller shaft and the powder barrel, resulting in the problem of powder jamming during the powder dropping process. Summary of the invention
[0004] The purpose of the utility model is to provide a downward pressure powder dropping mechanism, which drives the powder dropping diverter block to move and control the gap between the powder dropping diverter block and the frame through a power mechanism, so that the powder drops through the gap, and at the same time controls the powder dropping amount by controlling the size of the gap, replacing the powder roller shaft to drop powder and prevent powder jamming. Provide a 3D printer, which makes the powder drop uniform.
[0005] In order to achieve the aforementioned first purpose, the utility model adopts the following technical solution.
[0006] The downward pressure powder dropping mechanism comprises a frame, a powder dropping diverter block and a power mechanism. The powder dropping diverter block is connected to the power mechanism. The powder dropping diverter block is slidably connected to the opening at the upper end of the frame. The power mechanism drives the powder dropping diverter block to move to control the gap between the powder dropping diverter block and the frame.
[0007] The utility model adopts the above-mentioned scheme, by connecting the powder falling diverter block with the power mechanism, and also slidingly connecting the powder falling diverter block to the opening at the upper end of the frame, so that the power mechanism drives the powder falling diverter block to move and control the gap between the powder falling diverter block and the frame, so that the powder falls through the gap, and at the same time controls the amount of powder falling by controlling the size of the gap, thereby replacing the powder falling of the powder roller shaft and preventing powder jamming.
[0008] Preferably, the power mechanism includes two, each of which includes a motor, a screw-nut pair and a wedge block, the output shaft of the motor is connected to the screw of the screw-nut pair, the wedge block is connected to the nut of the screw-nut pair, and the two ends of the powder falling diverter block are respectively slidably connected to the corresponding inclined surfaces of the wedge block.
[0009] In this way, by setting up a motor, a screw nut pair and a wedge block, the output shaft of the motor is connected to the screw of the screw nut pair, the wedge block is connected to the nut of the screw nut pair, and the two ends of the powder falling diverter block are respectively slidably connected to the corresponding inclined surfaces of the wedge block, so that when the motor output shaft rotates, the screw nut is driven to move, and then the wedge block is driven to move. The wedge block drives the powder falling diverter block up and down, and the size of the gap between the powder falling diverter block and the frame is controlled.
[0010] Preferably, both ends of the frame are formed with vertical bar-shaped through holes, both ends of the powder falling diversion block pass through the vertical bar-shaped through holes, both ends of the powder falling diversion block are connected to control blocks, and the control blocks are slidably connected to the inclined surface of the wedge block.
[0011] In this way, by forming vertical through holes at both ends of the frame, it is convenient for the two ends of the powder falling diversion block to move up and down along the vertical through holes, and control blocks are connected to both ends of the powder falling diversion block. The control blocks are slidably connected to the inclined surfaces of the wedge blocks to improve the smoothness of the movement of the powder falling diversion block.
[0012] Preferably, the powder falling diversion block includes a powder falling part and a cross beam, the powder falling part includes two, the two powder falling parts are respectively connected to the two sides of the bottom of the cross beam, the two powder falling parts are inclined downward, and the free ends of the powder falling parts cooperate with the frame.
[0013] In this way, the powder falling diverter block is configured to include a powder falling portion and a cross beam, and two powder falling portions are respectively connected to the two sides of the bottom of the cross beam, and the two powder falling portions are tilted downward, so that the powder can fall along the powder falling portion through the tilt angle, and the free end of the powder falling portion is matched with the frame body, so that when the powder is not falling, the free end of the powder falling portion and the frame body are sealed to prevent the powder from falling, and the powder falling portion and the cross beam are both plate-shaped structures, which can reduce the gravity of the powder falling diverter block, and the powder falling diverter block is lifted up by a power mechanism to achieve powder falling, instead of rotating the powder roller shaft to drop the powder, thereby reducing the power required for powder dropping.
[0014] Preferably, a plurality of ribs are formed on the powder falling diversion block, and the ribs are connected between the outer side of the powder falling portion and the crossbeam.
[0015] In this way, a plurality of ribs are formed on the powder falling and diverting block, and the ribs are connected between the outer side of the powder falling portion and the cross beam, so that the strength and rigidity of the powder falling and diverting block are improved by the ribs.
[0016] Preferably, the frame is in the shape of an elongated strip as a whole, and the cross-section of the frame is funnel-shaped. A powder falling portion extending along the length direction of the frame is formed on the inner side wall of the upper end of the frame. The powder falling portion is in the shape of an elongated strip as a whole, and the cross-section of the powder falling portion is triangular. The free end of the powder falling portion can overlap with the surface located on the hypotenuse of the triangle.
[0017] In this way, by making the cross-section of the frame into a funnel shape, the powder can fall smoothly into the molding cavity below the frame, and a powder sliding portion is formed on the inner wall of the upper end of the frame, and the cross-section of the powder sliding portion is triangular, so that the powder falling from the powder falling portion onto the sliding portion can fall smoothly under the action of the powder sliding portion, thereby preventing the powder from accumulating on the powder falling portion, and the free end of the powder falling portion can be covered with the surface located on the hypotenuse of the triangle, so as to seal the powder falling gap when powder falling is not needed.
[0018] Preferably, the angle α between the hypotenuse of the triangle and the vertical center line of the frame is 30° to 35°.
[0019] In this way, the included angle α between the hypotenuse of the powder sliding portion and the vertical center line of the frame is 30° to 35°, so that the inclination angle of the hypotenuse is greater than the repose angle, which facilitates the powder to slide smoothly.
[0020] Preferably, it further comprises a support block, wherein the support block is connected to the inner side of the frame, and the top of the support block abuts against the bottom of the powder sliding portion.
[0021] In this way, by setting a support block and connecting the support block to the inner side of the frame, the top of the support block abuts against the bottom of the powder sliding part, the strength of the powder sliding part is improved by the support block, and the bevel of the powder sliding part is positioned at the same time, so that when the free end of the powder falling part is pressed down, it can fit with the bevel of the powder sliding part to achieve a completely sealed effect.
[0022] Preferably, it also includes a long strip of powder dispersion block, which is parallel to the powder sliding portion, the bottom surface of the powder dispersion block is connected to the inner side of the frame, the top surface of the powder dispersion block is tilted downward, the projection of the lower end of the hypotenuse of the triangle is located on the top surface of the powder dispersion block, and the angle β between the top surface of the powder dispersion block and the vertical center line of the frame is 45°~50°.
[0023] In this way, by setting up a powder dispersion block and tilting the top surface of the powder dispersion block downward, the projection of the lower end of the hypotenuse of the triangular cross-section of the powder sliding portion is also located on the top surface of the powder dispersion block, so that the powder falling from the inclined surface of the powder sliding portion can fall onto the top surface of the powder dispersion block. When the powder falls, it hits the powder dispersion block and is dispersed under the action of the powder dispersion block, thereby ensuring that the powder falling on the molding cavity below is evenly distributed, thereby improving the quality of the printed product, and the angle β between the top surface of the powder dispersion block and the vertical center line of the frame is 45°~50°, so that the dispersed powder can fall smoothly.
[0024] Preferably, it further comprises a plurality of supporting diverter blocks, wherein the supporting diverter blocks are evenly distributed along the inner bottom of the frame in the length direction, and the two ends of the supporting diverter blocks are respectively connected to the two inner side walls of the frame.
[0025] In this way, by providing the support and diversion blocks, the support and diversion blocks are evenly distributed along the inner bottom of the frame in the length direction, the strength of the bottom of the frame is improved by the support and diversion blocks, and further diversion of powder is achieved.
[0026] To achieve the aforementioned second purpose, the utility model adopts the following technical solution.
[0027] A 3D printer includes the above-mentioned downward pressure powder dropping mechanism. The utility model adopting the above-mentioned solution prevents the 3D printer from getting stuck with powder during printing and improves the uniformity of powder spreading.
[0028] The beneficial effects of the utility model are as follows: by connecting the powder-falling diverter block with the power mechanism, and also slidably connecting the powder-falling diverter block to the opening at the upper end of the frame, it is convenient to drive the powder-falling diverter block to move and control the gap between the powder-falling diverter block and the frame through the power mechanism, so that the powder falls through the gap, and at the same time, the powder falling amount is controlled by controlling the size of the gap, replacing the powder roller shaft to fall powder, and preventing powder jamming. By setting a powder dispersion block, and tilting the top surface of the powder dispersion block downward, and also locating the projection of the lower end of the hypotenuse of the cross-section of the powder sliding part as a triangle on the top surface of the powder dispersion block, it is convenient for the powder falling from the inclined surface of the powder sliding part to fall to the top surface of the powder dispersion block, and the powder is dispersed by the powder dispersion block, thereby ensuring that the powder falling on the lower molding cavity is evenly distributed, improving the quality of the printed product, and also the angle between the top surface of the powder dispersion block and the vertical center line of the frame is 45° to 50°, so that the dispersed powder can fall smoothly. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 It is a structural diagram of the utility model;
[0030] Figure 2 This is a structural diagram of the powder falling diversion block in the utility model;
[0031] Figure 3 It is a top view of the utility model;
[0032] Figure 4 For this utility model Figure 3 Cross-section of the middle BB;
[0033] Figure 5 For this utility model Figure 1 Enlarged view of section K. DETAILED DESCRIPTION
[0034] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments described.
[0035] The figure marks in the drawings of the specification include: powder falling diverter block 1, rib plate 11, control block 12, cross beam 13, powder falling part 14, motor 2, wedge block 21, screw nut pair 22, frame 3, powder sliding part 31, support block 32, support diverter block 33, powder dispersion block 34, vertical bar through hole 35.
[0036] The words "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one", "an" or "the" and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. Similarly, words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections or communication connections, whether direct or indirect.
[0037] Embodiment 1, as Figures 1 to 5 As shown; the present application provides a downward-pressing powder dropping mechanism, comprising a frame 3, a powder dropping diverter block 1 and a power mechanism, wherein the powder dropping diverter block 1 is connected to the power mechanism, and the powder dropping diverter block 1 is slidably connected to the upper opening of the frame 3, and the power mechanism drives the powder dropping diverter block 1 to move and control the gap between the powder dropping diverter block 1 and the frame 3.
[0038] See also Figure 1 and Figure 3 The power mechanism includes two, each of which includes a motor 2, a screw nut pair 22 and a wedge block 21. The output shaft of the motor 2 is connected to the screw of the screw nut pair 22, the wedge block 21 is connected to the nut of the screw nut pair 22, and the two ends of the powder diverter block 1 are respectively connected to the corresponding inclined surfaces of the wedge block 21. In this way, by setting the motor 2, the screw nut pair 22 and the wedge block 21, the output shaft of the motor 2 is connected to the screw of the screw nut pair 22, the wedge block 21 is connected to the nut of the screw nut pair 22, and the two ends of the powder diverter block 1 are respectively connected to the corresponding inclined surfaces of the wedge block 21. It is convenient to drive the screw nut to move when the output shaft of the motor 2 rotates, and then drive the wedge block 21 to move, and the powder diverter block 1 is driven to move up and down by the wedge block 21 to control the gap between the powder diverter block 1 and the frame 3.
[0039] See also Figure 1 and Figure 5, both ends of the frame 3 are formed with vertical bar-shaped through holes 35, both ends of the powder-falling diverter block 1 pass through the vertical bar-shaped through holes 35, both ends of the powder-falling diverter block 1 are connected with control blocks 12, and the control blocks 12 are slidably connected with the inclined surface of the wedge-shaped block 21. In this way, by forming vertical bar-shaped through holes 35 at both ends of the frame 3, it is convenient for both ends of the powder-falling diverter block 1 to move up and down along the vertical bar-shaped through holes 35, and by connecting the control blocks 12 at both ends of the powder-falling diverter block 1, the control blocks 12 are slidably connected with the inclined surface of the wedge-shaped block 21, so as to improve the smoothness of the movement of the powder-falling diverter block 1.
[0040] See also Figure 2 and Figure 4 The powder falling diversion block 1 includes a powder falling part 14 and a cross beam 13. The powder falling part 14 includes two powder falling parts. The two powder falling parts 14 are respectively connected to the two sides of the bottom of the cross beam 13. The two powder falling parts 14 are inclined downward, and the free end of the powder falling part 14 cooperates with the frame 3. In this way, the powder falling diverter block 1 is configured to include a powder falling portion 14 and a cross beam 13, and two powder falling portions 14 are respectively connected to the two sides of the bottom of the cross beam 13, and the two powder falling portions 14 are tilted downward, so that the powder can fall along the powder falling portion 14 through the tilt angle, and the free end of the powder falling portion 14 is matched with the frame 3, so that when no powder falls, the free end of the powder falling portion 14 and the frame 3 are sealed to prevent powder from falling, and the powder falling portion 14 and the cross beam 13 are both plate-shaped structures, which can reduce the gravity of the powder falling diverter block 1, and the powder falling diverter block 1 is lifted up by a power mechanism to achieve powder falling, instead of rotating the powder roller shaft to drop powder, thereby reducing the power required for powder falling.
[0041] See also Figure 1 and Figure 2 The powder falling and diverting block 1 is provided with a plurality of ribs 11, and the ribs 11 are connected between the outer side of the powder falling portion 14 and the cross beam 13. In this way, by forming a plurality of ribs 11 on the powder falling and diverting block 1 and connecting the ribs 11 between the outer side of the powder falling portion 14 and the cross beam 13, the strength and rigidity of the powder falling and diverting block 1 are improved by the ribs 11.
[0042] See also Figure 1 and Figure 4The frame 3 is in the shape of an elongated strip as a whole, and the cross section of the frame 3 is in the shape of a funnel. The inner side wall of the upper end of the frame 3 is formed with a powder falling portion 31 extending along the length direction of the frame 3. The powder falling portion 31 is in the shape of an elongated strip as a whole, and the cross section of the powder falling portion 31 is triangular. The free end of the powder falling portion 14 can overlap with the top surface of the powder falling portion 31. In this way, by making the cross section of the frame 3 funnel-shaped, it is convenient for the powder to fall smoothly into the molding cavity below the frame 3, and the powder falling portion 31 is formed on the inner side wall of the upper end of the frame 3, and the cross section of the powder falling portion 31 is triangular, so that the powder falling from the powder falling portion 14 on the falling portion can fall smoothly under the action of the powder falling portion 31, preventing the powder from accumulating on the powder falling portion 14, and the free end of the powder falling portion 14 can overlap with the top surface of the powder falling portion 31, so as to seal the powder falling gap when powder falling is not needed.
[0043] See also Figure 1 and Figure 4 , the angle α between the top surface of the powder sliding portion 31 and the vertical center line of the frame 3 is 30° to 35°. In this way, the angle α between the top surface of the powder sliding portion 31 and the vertical center line of the frame 3 is 30° to 35°, so that the inclination angle of the top surface is greater than the repose angle, so that the powder can slide smoothly.
[0044] See also Figure 1 and Figure 4 , and further includes a support block 32, the support block 32 is connected to the inner side of the frame 3, and the top of the support block 32 abuts against the bottom of the powder sliding portion 31. In this way, by providing the support block 32 and connecting the support block 32 to the inner side of the frame 3, the top of the support block 32 abuts against the bottom of the powder sliding portion 31, the strength of the powder sliding portion 31 is improved by the support block 32, and the bevel of the powder sliding portion 31 is positioned at the same time, so that when the free end of the powder falling portion 14 is pressed down, it can fit with the bevel of the powder sliding portion 31 to achieve a completely sealed effect.
[0045] See also Figure 4, also includes a long strip of powder dispersion block 34, the powder dispersion block 34 is parallel to the powder sliding portion 31, the bottom surface of the powder dispersion block 34 is connected to the inner side of the frame 3, the top surface of the powder dispersion block 34 is tilted downward, the projection of the lower end of the top surface of the powder sliding portion 31 is located on the top surface of the powder dispersion block 34, and the angle β between the top surface of the powder dispersion block 34 and the vertical center line of the frame 3 is 45° to 50°. In this way, by setting up a powder dispersion block 34 and tilting the top surface of the powder dispersion block 34 downward, the projection of the lower end of the hypotenuse of the triangular cross-section of the powder sliding portion 31 is located on the top surface of the powder dispersion block 34, so that the powder falling from the inclined surface of the powder sliding portion 31 can fall onto the top surface of the powder dispersion block 34, and the powder hits the powder dispersion block 34 when falling, and is dispersed under the action of the powder dispersion block 34, thereby ensuring that the powder falling on the molding cavity below is evenly distributed, thereby improving the quality of the printed product, and the angle β between the top surface of the powder dispersion block 34 and the vertical center line of the frame 3 is 45°~50°, so that the dispersed powder can fall smoothly.
[0046] See also Figure 4 , and also includes a plurality of support and diversion blocks 33, the support and diversion blocks 33 are evenly distributed along the inner bottom of the length direction of the frame 3, and the two ends of the support and diversion blocks 33 are respectively connected to the two inner side walls of the frame 3. In this way, by providing the support and diversion blocks 33, the support and diversion blocks 33 are evenly distributed along the inner bottom of the length direction of the frame 3, and the strength of the bottom of the frame 3 is improved by the support and diversion blocks 33, and further diversion of powder is achieved.
[0047] During operation, the control terminal controls the motor 2 to rotate and drive the wedge block 21 to move, thereby moving the powder falling diversion block 1 upward or downward, controlling the powder falling gap between the powder falling diversion block 1 and the frame 3, and then controlling the powder flow rate. The powder falls onto the powder sliding portion 31, and then falls from the powder sliding portion 31 to the powder dispersion block 34, and is dispersed and falls into the forming cylinder located below the frame 3 under the action of the powder dispersion block 34.
[0048] Embodiment 2 is a 3D printer, comprising the above-mentioned downward pressure powder dropping mechanism, to prevent the 3D printer from getting stuck during printing and to improve the powder spreading uniformity.
[0049] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.
Claims
1. Downward pressure powder dropping mechanism, characterized in that: The invention comprises a frame (3), a powder-falling diverter block (1) and a power mechanism, wherein the powder-falling diverter block (1) is connected to the power mechanism, and the powder-falling diverter block (1) is slidably connected to an opening at the upper end of the frame (3), and the power mechanism drives the powder-falling diverter block (1) to move to control the gap between the powder-falling diverter block (1) and the frame (3).
2. The downward pressure powder dropping mechanism according to claim 1, characterized in that: The power mechanisms include two, each of which includes a motor (2), a screw nut pair (22) and a wedge block (21); the output shaft of the motor (2) is connected to the screw of the screw nut pair (22); the wedge block (21) is connected to the nut of the screw nut pair (22); and the two ends of the powder falling diverter block (1) are respectively slidably connected to the inclined surfaces of the corresponding wedge blocks (21).
3. The downward pressure powder dropping mechanism according to claim 2, characterized in that: Both ends of the frame (3) are formed with vertical bar-shaped through holes (35), both ends of the powder falling diversion block (1) pass through the vertical bar-shaped through holes (35), both ends of the powder falling diversion block (1) are connected to control blocks (12), and the control blocks (12) are slidably connected to the inclined surfaces of the wedge-shaped blocks (21).
4. The downward pressure powder dropping mechanism according to claim 1, characterized in that: The powder dropping diversion block (1) comprises a powder dropping portion (14) of a plate-like structure and a crossbeam (13), wherein the powder dropping portion (14) comprises two powder dropping portions (14), the two powder dropping portions (14) are respectively connected to two sides of the bottom of the crossbeam (13), the two powder dropping portions (14) are both inclined downward, and the free ends of the powder dropping portions (14) cooperate with the frame (3).
5. The downward pressure powder dropping mechanism according to claim 4, characterized in that: A plurality of ribs (11) are formed on the powder falling diversion block (1), and the ribs (11) are connected between the outer side of the powder falling portion (14) and the crossbeam (13).
6. The downward pressure powder dropping mechanism according to claim 4, characterized in that: The frame (3) is in the shape of an elongated strip as a whole, and the cross section of the frame (3) is in the shape of a funnel. A powder falling portion (31) extending along the length direction of the frame (3) is formed on the inner side wall of the upper end of the frame (3). The powder falling portion (31) is in the shape of an elongated strip as a whole, and the cross section of the powder falling portion (31) is in the shape of a triangle. The free end of the powder falling portion (14) can overlap with the top surface of the powder falling portion (31).
7. The downward pressure powder dropping mechanism according to claim 6, characterized in that: It also comprises a support block (32), wherein the support block (32) is connected to the inner side of the frame (3), and the top of the support block (32) abuts against the bottom of the powder sliding portion (31).
8. The downward pressure powder dropping mechanism according to claim 6, characterized in that: It also includes a long strip of powder dispersion block (34), the powder dispersion block (34) is parallel to the powder sliding portion (31), the bottom surface of the powder dispersion block (34) is connected to the inner side of the frame (3), the top surface of the powder dispersion block (34) is tilted downward, the projection of the lower end of the hypotenuse of the triangle is located on the top surface of the powder dispersion block (34), and the angle β between the top surface of the powder dispersion block (34) and the vertical center line of the frame (3) is 45° to 50°.
9. The downward pressure powder dropping mechanism according to claim 6, characterized in that: It also comprises a plurality of supporting flow-dividing blocks (33), wherein the supporting flow-dividing blocks (33) are evenly distributed along the inner bottom of the frame body (3) in the length direction, and the two ends of the supporting flow-dividing blocks (33) are respectively connected to the two inner side walls of the frame body (3).
10. A 3D printer, characterized in that: It includes the downward pressure powder dropping mechanism described in any one of claims 1 to 9.