Bidirectional roller powder spreading device for 3D printing

Abstract

The utility model relates to a bi-directional roller powder spreading device for 3D printing, and belongs to the technical field of 3D printing powder spreading devices, the bi-directional roller powder spreading device for 3D printing comprises a workbench, a powder spreading assembly, a powder supply box, a 3D printing mechanism and a reciprocating driving mechanism, the powder spreading assembly comprises a sliding plate and two rollers, and the two rollers are rotatably connected to the sliding plate at intervals; a printing hole is formed in the workbench; the powder supply box is located above the workbench, and a powder supply hole is formed in the bottom face of the powder supply box. The 3D printing mechanism comprises a 3D printing plate and a 3D printing lifting machine, and the 3D printing plate slides in the printing hole; the 3D printing lifter is fixed to the bottom face of the workbench, and the lifting end of the 3D printing lifter is fixed to the bottom face of the 3D printing plate. The reciprocating driving mechanism is fixed to the workbench, and the driving end of the reciprocating driving mechanism reciprocates in the sliding direction of the sliding plate. The sliding plate is fixed to the driving end of the reciprocating driving mechanism. According to the utility model, the two rollers which are arranged in parallel at an interval are utilized to roll and spread powder on the workbench, so that slightly warped sample pieces can be prevented from being scraped away, and the percent of pass of 3D printing is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing powder spreading devices, in particular to a two-way roller powder spreading device for 3D printing. Background Art

[0002] A 3D printing device spreads powder layer by layer in a forming area, and then selectively scans the powder according to the cross-sectional shape of a part by a laser, so that the powder in the same area as the cross-sectional shape area melts. Through the reciprocating powder feeding and powder spreading of the powder spreading device, and selectively melting the powder, the workpiece is formed.

[0003] For the purpose of powder spreading, devices with reciprocatingly movable powder spreading devices are described in many patented technologies. The powder spreading device includes two powder spreading blades separated from each other. In the space between the blades, a powdered molding material is filled. Then, during the movement of the powder spreading device, the molding material is pushed and pulled by a doctor blade into a smooth thin layer. However, some powder materials have strong adhesiveness and thus are prone to agglomeration (forming agglomerates). When there is slight warping during the printing process of a printed part, the bottom of the doctor blade can easily scrape and carry away the warped sample, resulting in printing failure. In addition, in order to improve the powder spreading efficiency, two powder bins are usually arranged in the prior art for two-way powder spreading. Although the design of the double powder bin structure improves the powder spreading efficiency, due to the arrangement of two powder bins, the moving distance of the doctor blade is increased, and the double powder bin structure greatly exacerbates the complexity of the powder bin structure, has limited improvement on the powder spreading efficiency, and greatly increases the cost of the device.

[0004] Therefore, how to design a two-way roller powder spreading device for 3D printing with a simple structure, high powder spreading efficiency, good powder spreading effect and not easy to scrape away the sample is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

[0005] The utility model provides a two-way roller powder spreading device for 3D printing, and solves the technical problems of the existing 3D printing powder spreading device with complex structure, high preparation cost, low powder spreading efficiency and easy to scrape away the sample.

[0006] The technical solution for the utility model to solve the above technical problems is as follows: a two-way roller powder spreading device for 3D printing includes: a workbench, a powder spreading assembly, a powder supply box, a 3D printing mechanism and a reciprocating driving mechanism.

[0007] The powder spreading assembly includes a slide plate and two rollers. The plate surface of the slide plate is vertically arranged with respect to the top surface of the workbench and reciprocates linearly on the workbench; the two rollers are both arranged at intervals along the direction perpendicular to the sliding direction of the slide plate, and one end of each of them is rotatably connected to the slide plate. The gap between the two rollers is the powder spreading storage area; a printing hole is provided on the workbench and can be arranged opposite to the powder spreading storage area; the powder supply box is located above the workbench, and a powder inlet hole is provided on its top surface, and a powder supply hole that can be arranged opposite to the powder spreading storage area is provided on its bottom surface; the 3D printing mechanism includes a 3D printing plate and a 3D printing elevator. The 3D printing plate slides in the printing hole; the 3D printing elevator is fixed to the bottom surface of the workbench, and its lifting end is fixed to the bottom surface of the 3D printing plate; the reciprocating driving mechanism is located on one side of the slide plate and is fixed to the workbench. The driving end of the reciprocating driving mechanism reciprocates along the sliding direction of the slide plate; the slide plate is fixed to the driving end of the reciprocating driving mechanism.

[0008] The beneficial effects of the present utility model are as follows: Breaking through the design constraints of traditional 3D printing powder spreading devices, using two parallel and spaced rollers to roll and spread powder on the workbench can avoid scraping away slightly warped samples and improve the qualification rate of 3D printing.

[0009] Based on the above technical solutions, the present utility model can be further improved as follows.

[0010] Furthermore, it further includes a powder returning mechanism. A powder returning hole is provided on the workbench and can be arranged opposite to the powder spreading storage area. The printing hole and the powder returning hole are arranged in sequence along the sliding direction of the slide plate; the powder returning mechanism includes a powder returning box and a powder returning elevator. The powder returning box slides in the powder returning hole, and a powder returning inlet and outlet hole is provided on its top surface; the powder returning lifting mechanism is fixed to the bottom surface of the workbench, and its lifting end is fixed to the bottom surface of the powder returning box.

[0011] The beneficial effects of adopting the above are as follows: First, use the powder supply box to fill at least two layers of powder into the powder spreading storage area, and then drive the two rollers to roll and move linearly. At this time, one layer of powder is laid on the workbench, and the other layer of powder is stored in the powder returning box. When the two rollers rotate and move in the reverse direction, the powder returning box can be moved upward to backfill the powder in the powder returning box into the powder spreading storage area, so as to perform secondary powder spreading when the two rollers rotate and move in the reverse direction, improve the powder spreading efficiency, simplify the structure, and reduce the preparation cost of the powder spreading device.

[0012] Further, it further includes a powder replenishing mechanism. A powder replenishing hole is provided on the workbench and can be arranged opposite to the powder spreading storage area. The powder replenishing hole, the printing hole, and the powder returning hole are sequentially arranged along the sliding direction of the slide plate. The powder replenishing mechanism includes a powder replenishing box and a powder replenishing elevator. The powder replenishing box slides in the powder replenishing hole and a powder replenishing inlet and outlet hole is provided on its top surface. The powder replenishing elevator is located below the workbench and its lifting end is fixed to the bottom surface of the powder replenishing box.

[0013] The beneficial effect of the above further improvement is that by moving the powder replenishing box up and down, powder can be replenished for the powder spreading storage area and the powder spreading effect can be improved.

[0014] Further, it further includes an overflow box. An overflow hole is provided on the workbench and can be arranged opposite to the powder spreading storage area. The overflow hole, the powder replenishing hole, the printing hole, and the powder returning hole are sequentially arranged along the sliding direction of the slide plate. The overflow box is fixed to the bottom end of the workbench and an overflow inlet hole opposite to the overflow hole is provided on its top surface. An overflow outlet hole is provided on the bottom surface of the overflow box and a switch valve is fixed at the overflow outlet hole.

[0015] The beneficial effect of the above further improvement is that by arranging the overflow inlet hole on the overflow box opposite to the overflow hole on the workbench, the excess powder on the workbench and in the powder spreading storage area can be transferred to the overflow box, avoiding the influence of the excess powder on the workbench or in the powder spreading storage area on the powder spreading effect.

[0016] Further, the overflow hole, the powder replenishing hole, the printing hole, and the powder returning hole are all in a long strip structure arranged perpendicular to the sliding direction of the slide plate.

[0017] Further, it further includes a powder guiding plate. The powder guiding plate is located above the two rollers and is vertically fixed to the slide plate. A powder guiding hole opposite to the powder spreading storage area is provided on the powder guiding plate.

[0018] Further, the reciprocating driving mechanism includes a driving wheel, a driven wheel, a belt, a sliding seat, and a reciprocating driving motor. The driving wheel and the driven wheel are both located on one side of the slide plate and are arranged at intervals along the direction of the slide plate. The driving wheel and the driven wheel are both rotatably connected to the workbench in parallel. The belt is driven on the driving wheel and the driven wheel. The reciprocating driving motor is fixed to the workbench and its output shaft is drivingly connected to the driving wheel. The sliding seat is the moving end of the reciprocating driving mechanism and is fixed to the belt. The slide plate is fixed to the sliding seat.

[0019] Further, it further includes a partition plate. The partition plate is arranged parallel to the slide plate and is fixed to the workbench corresponding to the position between the sliding seat and the slide plate. A long strip hole arranged along the sliding direction of the slide plate is provided on the partition plate. The sliding seat slides in the long strip hole. Description of the Drawings

[0020] Figure 1 This is a three - dimensional structural schematic diagram of a two - way roller powder spreading device for 3D printing according to the present utility model;

[0021] Figure 2 This is a partial enlarged structural schematic diagram of a slide plate, two rollers and a blade powder plate in a two - way roller powder spreading device for 3D printing according to the present utility model;

[0022] Figure 3 This is a simple structural schematic diagram of a two - way roller powder spreading device for 3D printing according to the present utility model.

[0023] In the drawings, the list of components represented by each reference numeral is as follows:

[0024] 1. Workbench, 11. Printing hole, 12. Powder return hole, 13. Overflow hole, 2. Powder spreading assembly, 21. Slide plate, 22. Roller, 3. Powder supply box, 4. 3D printing mechanism, 41. 3D printing plate, 42. Printing elevator, 5. Reciprocating drive mechanism, 51. Driven wheel, 52. Belt, 53. Slide seat, 6. Powder return mechanism, 61. Powder return box, 62. Powder return elevator, 7. Powder replenishing mechanism, 71. Powder replenishing box, 72. Powder replenishing elevator, 8. Overflow box, 9. Powder guiding plate, 91. Powder guiding hole, 10. Partition board. Detailed Embodiment

[0025] The principles and features of the present utility model will be described below with reference to the drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0026] As Figure 3 and Figure 2 shown, a two - way roller powder spreading device for 3D printing includes: a workbench 1, a powder spreading assembly 2, a powder supply box 3, a 3D printing mechanism 4 and a reciprocating drive mechanism 5,

[0027] The powder spreading assembly 2 includes a sliding plate 21 and two rollers 22. The plate surface of the sliding plate 21 is vertically arranged with respect to the top surface of the workbench 1 and reciprocates linearly on the workbench 1; the two rollers 22 are both arranged at intervals along the direction perpendicular to the sliding direction of the sliding plate 21, and one end of each of them is rotatably connected to the sliding plate 21. The gap between the two rollers 22 is the powder spreading storage area; there is a printing hole 11 on the workbench 1 that can be arranged opposite to the powder spreading storage area; the powder supply box 3 is located above the workbench 1, and its top surface is provided with a powder inlet hole, and its bottom surface is provided with a powder supply hole that can be arranged opposite to the powder spreading storage area; the 3D printing mechanism 4 includes a 3D printing plate 41 and a 3D printing elevator 42. The 3D printing plate 41 slides in the printing hole 11; the 3D printing elevator 42 is fixed to the bottom surface of the workbench 1, and its lifting end is fixed to the bottom surface of the 3D printing plate 41; the reciprocating driving mechanism 5 is located on one side of the sliding plate 21 and fixed to the workbench 1. The driving end of the reciprocating driving mechanism 5 reciprocates along the sliding direction of the sliding plate 21; the sliding plate 21 is fixed to the driving end of the reciprocating driving mechanism 5.

[0028] In some specific embodiments, a powder recycling mechanism 6 may further be included. There is a powder recycling hole 12 on the workbench 1 that can be arranged opposite to the powder spreading storage area. The printing hole 11 and the powder recycling hole 12 are arranged in sequence along the sliding direction of the sliding plate 21; the powder recycling mechanism 6 includes a powder recycling box 61 and a powder recycling elevator 62. The powder recycling box 61 slides in the powder recycling hole 12, and its top surface is provided with a powder recycling inlet and outlet hole; the powder recycling elevator 62 is fixed to the bottom surface of the workbench 1, and its lifting end is fixed to the bottom surface of the powder recycling box 61.

[0029] In some specific embodiments, a powder replenishing mechanism 7 may further be included. There is a powder replenishing hole on the workbench 1 that can be arranged opposite to the powder spreading storage area. The powder replenishing hole, the printing hole 11 and the powder recycling hole 12 are arranged in sequence along the sliding direction of the sliding plate 21; the powder replenishing mechanism 7 includes a powder replenishing box 71 and a powder replenishing elevator 72. The powder replenishing box 71 slides in the powder replenishing hole, and its top surface is provided with a powder replenishing inlet and outlet hole; the powder replenishing elevator 72 is located below the workbench 1, and its lifting end is fixed to the bottom surface of the powder replenishing box 71.

[0030] In some specific embodiments, an overflow box 8 may further be included. There is an overflow hole 13 on the workbench 1 that can be arranged opposite to the powder spreading storage area. The overflow hole 13, the powder replenishing hole, the printing hole 11 and the powder recycling hole 12 are arranged in sequence along the sliding direction of the sliding plate 21; the overflow box 8 is fixed to the bottom end of the workbench 1, and its top surface is provided with an overflow inlet hole arranged opposite to the overflow hole 13. The bottom surface of the overflow box 8 is provided with an overflow outlet hole, and a switch valve is fixed at the overflow outlet hole.

[0031] Specifically, the overflow hole 13, the powder replenishing hole, the printing hole 11 and the powder recycling hole 12 are all strip-shaped structures arranged along the direction perpendicular to the sliding direction of the sliding plate 21.

[0032] In some specific embodiments, a powder guiding plate 9 may further be included. The powder guiding plate 9 is located above the two rollers 22 and is vertically fixed to the sliding plate 21. The powder guiding plate 9 is provided with powder guiding holes 91 arranged opposite to the powder spreading storage area.

[0033] In some specific embodiments, the reciprocating driving mechanism 5 may include a driving wheel, a driven wheel 51, a belt 52, a sliding seat 53 and a reciprocating driving motor. The driving wheel and the driven wheel 51 are both located on one side of the sliding plate 21 and are arranged at intervals along the direction of the sliding plate 21. The driving wheel and the driven wheel 51 are both rotatably connected to the workbench 1 in parallel; the belt 52 is transmitted on the driving wheel and the driven wheel 51; the reciprocating driving motor is fixed to the workbench 1 and its output shaft is in transmission connection with the driving wheel; the sliding seat 53 is the moving end of the reciprocating driving mechanism 5 and is fixed to the belt 52; the sliding plate 21 is fixed to the sliding seat 53.

[0034] In some specific embodiments, a partition plate 10 may further be included. The partition plate 10 is arranged parallel to the sliding plate 21 and is fixed to the workbench 1 corresponding to the position between the sliding seat 53 and the sliding plate 21. The partition plate 10 is provided with long holes arranged along the sliding direction of the sliding plate 21; the sliding seat 53 slides in the long holes.

[0035] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A two-way roller powder spreading device for 3D printing, characterized in that: include: Workbench (1), A powder spreading component (2), the powder spreading component (2) comprising a slide plate (21) and two rollers (22), the slide plate (21) being arranged perpendicularly to the top surface of the workbench (1) and sliding reciprocatingly on the workbench (1) along a straight line; the two rollers (22) being arranged at intervals perpendicular to the sliding direction of the slide plate (21) and one end of each roller being rotatably connected to the slide plate (21), the gap between the two rollers (22) being a powder spreading storage area; the workbench (1) being provided with a printing hole (11) which can be arranged opposite to the powder spreading storage area; A powder supply box (3), the powder supply box (3) being located above the workbench (1) and having a powder inlet hole on its top surface and a powder supply hole on its bottom surface that can be arranged opposite to the powder storage area; A 3D printing mechanism (4), the 3D printing mechanism (4) comprising a 3D printing plate (41) and a 3D printing elevator (42), the 3D printing plate (41) sliding in the printing hole (11); the 3D printing elevator (42) being fixed to the bottom surface of the workbench (1) and having a lifting end fixed to the bottom surface of the 3D printing plate (41); A reciprocating drive mechanism (5), the reciprocating drive mechanism (5) is located on one side of the slide plate (21) and is fixed on the workbench (1), the driving end of the reciprocating drive mechanism (5) moves back and forth along the sliding direction of the slide plate (21); the slide plate (21) is fixed on the driving end of the reciprocating drive mechanism (5).

2. A bidirectional roller powder spreading device for 3D printing according to claim 1, characterized in that: It also includes a powder return mechanism (6), wherein the workbench (1) is provided with a powder return hole (12) which can be arranged opposite to the powder storage area, and the printing hole (11) and the powder return hole (12) are arranged in sequence along the sliding direction of the slide plate (21); the powder return mechanism (6) includes a powder return box (61) and a powder return elevator (62), the powder return box (61) slides in the powder return hole (12) and its top surface is provided with a powder return inlet and outlet hole; the powder return elevator (62) is fixed to the bottom surface of the workbench (1) and its lifting end is fixed to the bottom surface of the powder return box (61).

3. A bidirectional roller powder spreading device for 3D printing according to claim 2, characterized in that: The invention also comprises a powder replenishing mechanism (7), wherein the workbench (1) is provided with a powder replenishing hole which can be arranged opposite to the powder spreading storage area, and the powder replenishing hole, the printing hole (11) and the powder returning hole (12) are arranged in sequence along the sliding direction of the slide plate (21); the powder replenishing mechanism (7) comprises a powder replenishing box (71) and a powder replenishing elevator (72), the powder replenishing box (71) slides in the powder replenishing hole and a powder replenishing inlet and outlet hole is provided on its top surface; the powder replenishing elevator (72) is located below the workbench (1) and its lifting end is fixed to the bottom surface of the powder replenishing box (71).

4. A bidirectional roller powder spreading device for 3D printing according to claim 3, characterized in that: It also includes an overflow box (8), the workbench (1) is provided with an overflow hole (13) which can be arranged opposite to the powder storage area, and the overflow hole (13), the powder replenishing hole, the printing hole (11) and the powder return hole (12) are arranged in sequence along the sliding direction of the slide plate (21); the overflow box (8) is fixed to the bottom end of the workbench (1) and its top surface is provided with an overflow inlet hole arranged opposite to the overflow hole (13), the bottom surface of the overflow box (8) is provided with an overflow outlet hole and a switch valve is fixed at the overflow outlet hole.

5. A bidirectional roller powder spreading device for 3D printing according to claim 4, characterized in that: The overflow hole (13), the powder replenishing hole, the printing hole (11) and the powder returning hole (12) are all long strip structures arranged along a direction perpendicular to the sliding direction of the slide plate (21).

6. A bidirectional roller powder spreading device for 3D printing according to claim 1, characterized in that: It also comprises a powder guide plate (9), which is located above the two rollers (22) and vertically fixed on the slide plate (21), and is provided with a powder guide hole (91) arranged opposite to the powder storage area.

7. A bidirectional roller powder spreading device for 3D printing according to claim 1, characterized in that: The reciprocating drive mechanism (5) comprises a driving wheel, a driven wheel (51), a belt (52), a slide (53) and a reciprocating drive motor. The driving wheel and the driven wheel (51) are both located on one side of the slide plate (21) and are arranged at intervals along the direction of the slide plate (21). The driving wheel and the driven wheel (51) are both connected to the workbench (1) for parallel rotation. The belt (52) is driven on the driving wheel and the driven wheel (51). The reciprocating drive motor is fixed on the workbench (1) and its output shaft is connected to the driving wheel for transmission. The slide (53) is the moving end of the reciprocating drive mechanism (5) and is fixed on the belt (52). The slide plate (21) is fixed on the slide (53).

8. A bidirectional roller powder spreading device for 3D printing according to claim 7, characterized in that: It also includes a partition (10), which is arranged parallel to the slide (21) and fixed on the workbench (1) corresponding to the slide seat (53) and the slide (21), and is provided with a long hole arranged along the sliding direction of the slide (21); the slide seat (53) slides in the long hole.

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