A 3D printing bidirectional powder spreader and 3D printing device

Abstract

The application discloses a 3D printing bidirectional powder spreading device and a 3D printing device using the same. The powder spreading device comprises a crossbeam, a powder hopper, a plum blossom powder spreading and quantifying roller, two brush scattering rollers and two powder spreading scrapers. The crossbeam is provided with sliding frames at both ends for sliding connection with the printing device. The powder hopper is fixedly connected with the crossbeam and is provided with a discharge port at the bottom. The plum blossom powder spreading and quantifying roller is rotatably arranged below the discharge port and is provided with an axial quantifying groove on the roller surface. The two brush scattering rollers are respectively arranged in parallel on the front side and the rear side of the quantifying roller, and the bristles can extend into the groove to sweep off the powder. The two powder spreading scrapers are respectively arranged on the outer sides of the two brush scattering rollers. The design makes the powder spreading device work cooperatively with the brush scattering roller and the powder spreading scraper on the corresponding side during the forward and backward strokes to complete the scattering and scraping of the powder, realizes bidirectional powder spreading, completely eliminates the idle time in the resetting process of the traditional powder spreading device, and significantly improves the powder spreading efficiency and equipment utilization.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, specifically to a 3D printing bidirectional powder spreader and a 3D printing device. Background Technology

[0002] "Powder spreading" is a crucial step in microdroplet jet 3D printing technology. It specifically refers to the process where, during printing, a specialized powder spreading device precisely and evenly spreads metal or other material powder onto a work platform to form an extremely thin powder layer. The basic process involves the powder spreader (usually including a spreading blade or roller) evenly spreading the powder material onto the spreading platform, forming a powder layer of a specific thickness (approximately 0.3 mm). Then, the printer nozzle, like a regular printer spraying ink, precisely sprays ink onto the powder particles that need to be cured, based on the slicing information from the computer model. The binder in the ink and powder reacts rapidly, bonding the powder layer firmly. Then, the spreading platform descends a certain height, and more powder is spread, more ink is sprayed… This cycle repeats thousands of times until the entire three-dimensional structure is "printed" layer by layer. The uniformity and smoothness of the powder spreading (non-metallic / metallic powder) directly affect the precision, surface quality, and mechanical properties of the final molded part.

[0003] The applicant previously designed a powder spreader and a 3D printing device for 3D printing, referring to... Figure 1 The powder spreader includes a powder spreading frame, a powder hopper 2, a plum blossom powder spreading metering roller 4, a brush dispersing roller 5, and a powder spreading scraper 6. The powder spreading frame is slidably connected to the 3D printing device via a crossbeam 1; the powder hopper 2 is fixed on the powder spreading frame; the plum blossom powder spreading metering roller 4 is rotatably positioned below the discharge port of the powder hopper 2, and its roller surface has metering grooves; the brush dispersing roller 5 is located in front of the plum blossom powder spreading metering roller 4, and its bristles are used to disperse / sweep off the powder in the metering grooves; the powder spreading scraper 6 is located behind the plum blossom powder spreading metering roller 4 and is used to level the powder; a powder gap adjustment plate 8 is set on the outside of the powder hopper 2 to assist in adjusting the powder gap between the powder hopper 2 and the plum blossom powder spreading metering roller 4, thereby controlling the amount and position of powder. During operation, the plum blossom powder spreading metering roller 4 carries a metered amount of powder, the brush dispersing roller 5 disperses / sweeps off the powder in the metering grooves to avoid clumping or adhesion, and the powder spreading scraper 6 finally levels the powder to form a compact powder bed.

[0004] When the aforementioned powder spreader for 3D printing is used, the powder spreader travels in the powder spreading direction until it reaches the end point, and then needs to retreat back to the starting point (reset) before performing the next powder spreading operation. This process is repeated until the printed product is formed. However, this powder spreading method has an idle running time during the powder spreader reset process, resulting in low powder spreading efficiency and high power consumption. Therefore, the applicant has further improved the powder spreader to improve powder spreading efficiency. Summary of the Invention

[0005] The purpose of this invention is to develop a bidirectional powder spreader and a 3D printing device to solve the problem that in the prior art, the powder spreader needs to wait for it to reset after a single powder spread before it can spread powder again, resulting in low powder spread efficiency and high power consumption, thereby improving the powder spread efficiency of the powder spreader.

[0006] This invention is achieved through the following technical solution: A 3D printed bidirectional powder spreader powder spreader frame, comprising: A crossbeam, with sliding frames at both ends for sliding connection with a 3D printing device; The powder hopper is fixedly connected to the crossbeam, and the bottom of the powder hopper has a discharge port; The plum blossom powder metering roller is rotatably connected to the crossbeam and is arranged parallel to the discharge port of the powder hopper. The outer circumferential surface of the plum blossom powder metering roller has metering grooves that extend axially for metering powder carrying in a metering manner, which are evenly distributed in the circumferential direction. Also includes: Two brush dispersing rollers are rotatably connected to the crossbeam and are respectively arranged in parallel on the front and rear sides of the plum blossom powder dispersing metering roller. The surface of the brush dispersing roller is covered with bristles, which extend into the metering groove one after another to sweep off the powdery material when the brush dispersing roller rotates. Two powder spreading scrapers are fixedly connected to the crossbeam and are respectively arranged parallel to the front and rear sides of the plum blossom powder spreading metering roller, and are respectively located on the side of the two brush dispersing rollers away from the plum blossom powder spreading metering roller.

[0007] The beneficial effects of the above technical solution are as follows: the powder spreading frame is slidably connected to the frame of the 3D printing device via a sliding frame, allowing the powder spreader to move forward and backward. When the powder spreader moves forward, the plum blossom powder spreading metering roller rotates counterclockwise, and the brush dispersing roller behind it rotates clockwise, thereby sweeping off the powder in the metering groove, and the powder spreading scraper behind it smooths the powder. When the powder spreader moves backward, the plum blossom powder spreading metering roller rotates clockwise, and the brush dispersing roller in front of it rotates counterclockwise, thereby sweeping off the powder in the metering groove, and the powder spreading scraper in front of it smooths the powder. Through this bidirectional powder spreading design, the powder spreader can perform powder spreading operations during both forward and backward movements, avoiding the blank time during the reset process of existing powder spreaders, greatly improving powder spreading efficiency and reducing power consumption. In one feasible embodiment, the crossbeam includes a first crossbeam and a second crossbeam respectively disposed on the front and rear sides of the powder hopper, and the ends of the first and second crossbeams are each provided with a sliding frame for sliding connection with the 3D printing device. The first and second crossbeams can be connected to the frame of the 3D printing device through the sliding frame, which improves the stability of the powder spreader during bidirectional sliding and effectively suppresses micro-vibrations during high-speed reciprocating motion. In another feasible embodiment, an adjustment and locking mechanism is provided between the crossbeam and the sliding frame. The adjustment and locking mechanism is used to drive the crossbeam to rotate relative to the sliding frame along an axis parallel to the crossbeam and lock it. The adjustment and locking mechanism allows the crossbeam to be finely adjusted and fixed according to actual needs. By adjusting the locking mechanism, the working angle of the powder spreading scraper can be optimized, which not only smooths the powder surface but also produces a certain compaction effect on the powder, forming a denser and flatter powder bed, providing an excellent foundation for subsequent printing and directly improving the quality of part forming.

[0008] Furthermore, the adjusting and locking mechanism includes an adjusting bolt and a fixing block fixedly connected to the sliding frame. The fixing block extends laterally from the sliding frame to the front and / or rear side of the crossbeam. The fixing block has adjusting screw holes corresponding to the front and / or rear side of the crossbeam. The adjusting bolt is screwed in or out relative to the adjusting screw holes to abut against the crossbeam, thereby causing the crossbeam to rotate backward / forward at a certain angle relative to the sliding frame. By screwing in or out the adjusting bolt, pressure can be applied to the crossbeam to make it rotate relative to the sliding frame, thereby achieving fine-tuning of its angle. In a feasible embodiment, the lower part of the powder hopper includes two inclined plates arranged opposite each other, with the lower ends of the two inclined plates close together to form the discharge port. On the front and rear sides of the powder hopper, the inclined plates and the powder spreading scraper form a clearance space for accommodating the brush dispersing roller. The inclined plates can both guide the powder flow to the discharge port and provide some clearance, allowing the brush dispersing roller to be installed on the front and rear sides of the powder hopper, resulting in a more compact overall structure. Furthermore, both inclined plates are equipped with powder gap adjustment plates on their outer sides. Each adjustment plate comprises several unit plates, the lower end of which extends below the discharge port to guide powder from the discharge port to the plum blossom powder spreading metering roller. The unit plates are connected to the inclined plates via a height adjustment mechanism, and the lower end height of each unit plate can be independently adjusted and fixed. By independently adjusting the lower end height of each unit plate, the discharge gap between the powder discharge port and the plum blossom powder spreading metering roller can be precisely controlled to be consistent. Especially for bidirectional powder spreaders, this ensures uniform thickness during bidirectional powder spreading. If the overall positioning of the powder gap adjustment plate deviates, or if the plum blossom powder spreading metering roller and metering groove are bent due to manufacturing precision issues, the height of each unit plate can be adjusted separately to ensure consistent powder gap at different positions of the discharge port. Furthermore, the height adjustment mechanism includes mounting bolts and a waist-shaped adjustment hole extending vertically on the inclined plate. The unit plate is detachably connected to the inclined plate via the waist-shaped adjustment hole and the mounting bolts. Furthermore, the height adjustment mechanism also includes a mounting plate, through which the unit plate is connected to the outside of the inclined plate; the mounting plate includes a backing plate that abuts against the outer wall of the inclined plate and is fixed between the inclined plate and the unit plate, and an adjustment plate that is bent outward relative to the backing plate; the upper end of the unit plate is bent outward to form a bent plate, and the adjustment plate and the bent plate are connected by positioning bolts to maintain their relative height. Furthermore, a spring is fitted onto the positioning bolt, and the spring is positioned between the adjustment plate and the bent plate; fitting a spring onto the positioning bolt and positioning it between the adjustment plate and the bent plate serves to maintain the relative position of the adjustment plate and the bent plate.

[0009] The present invention also provides a 3D printing device, including a frame, on which a powder spreading plane is provided, and a 3D printing bidirectional powder spreader as described above is mounted on the frame. The sliding frame reciprocates with the frame in the longitudinal direction. After the bidirectional powder spreader is installed on the frame, the sliding frame reciprocates along the longitudinal guide rail, driving the bidirectional powder spreader to move back and forth along the powder spreading plane. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the working state of a 3D printing device in the background art. Figure 2 This is a schematic diagram of the bidirectional powder spreader in an embodiment of the present invention; Figure 3 for Figure 2 Side view of the bidirectional powder spreader; Figure 4 This is a schematic diagram of the crossbeam and its adjustment and locking mechanism in an embodiment of the present invention; Figure 5 This is a schematic diagram of the powder spreading scraper (and its mounting profile) on the hidden side of the bidirectional powder spreader in an embodiment of the present invention; Figure 6 for Figure 5 Enlarged view of point A in the middle; Figure 7 for Figure 5 A partial structural diagram of the height adjustment mechanism; Figure 8 This is a partial schematic diagram of the outer side of the powder hopper of the bidirectional powder spreader in an embodiment of the present invention; Figure 9 This is a schematic diagram showing the positional relationship between the plum blossom powder dispersing roller and the brush dispersing roller in an embodiment of the present invention.

[0011] In the diagram: 1. Crossbeam; 101. Sliding frame; 2. Powder hopper; 21. Discharge port; 22. Inclined plate; 23. Mounting plate; 231. Abutment plate; 232. Adjusting plate; 24. Support plate; 25. Positioning bolt; 26. Spring; 3. Vibrator; 4. Powder spreading metering roller; 41. Metering groove; 5. Brush dispersing roller; 6. Powder spreading scraper; 7. Powder spreading scraper mounting profile; 8. Powder discharge gap adjustment plate; 81. Waist-shaped adjustment hole; 82. Unit plate; 821. Bending plate; 83. Mounting bolt; 9. Adjustment locking mechanism; 91. Fixing block; 92. Adjusting bolt. Detailed Implementation

[0012] First, those skilled in the art should understand that the following embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0013] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0014] In the embodiments of this application, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0015] To make the objectives, features and advantages of the present invention more apparent and understandable, specific embodiments are described in detail below with reference to the accompanying drawings.

[0016] like Figures 2 to 4 As shown, this embodiment provides a 3D printed bidirectional powder spreader, including: The powder spreading frame includes a crossbeam 1, and the two ends of the crossbeam 1 are provided with sliding frames 101 for sliding connection with the 3D printing device; The powder hopper 2 is fixedly connected to the crossbeam 1, and the bottom of the powder hopper 2 has a discharge port 21; The plum blossom powder metering roller 4 is rotatably connected to the crossbeam 1 and is arranged parallel to the discharge port 21 of the powder hopper 2. The outer circumferential surface of the plum blossom powder metering roller 4 has metering grooves 41 that extend axially for metering powder carrying in a metering manner, which are evenly distributed in the circumferential direction. Two brush dispersing rollers 5 are rotatably connected to the crossbeam 1 and are respectively arranged in parallel on the front and rear sides of the plum blossom powder dispersing roller 4. The surface of the brush dispersing roller 5 is covered with bristles, which extend into the metering groove 41 one after another to sweep off the powdery material when the brush dispersing roller 5 rotates. Two powder spreading scrapers 6 are fixedly connected to the crossbeam 1 via L-shaped powder spreading scraper mounting profiles 7. They are respectively arranged parallel to the front and rear sides of the plum blossom powder spreading metering roller 4, and are located outside the two brush dispersing rollers 5 (i.e., on the side of the two brush dispersing rollers 5 away from the plum blossom powder spreading metering roller 4). In this design, the powder spreading frame is slidably connected to the frame of the 3D printing device via a sliding frame 101, allowing the powder spreader to move forward and backward. When the powder spreader moves forward, the plum blossom powder spreading metering roller 4 rotates counterclockwise, and the brush dispersing roller 5 behind it rotates clockwise, thereby sweeping off the powder in the metering groove 41, and the powder spreading scraper 6 behind it smooths the powder. When the powder spreader moves backward, the plum blossom powder spreading metering roller 4 rotates clockwise, and the brush dispersing roller 5 in front of it rotates counterclockwise, thereby sweeping off the powder in the metering groove 41, and the powder spreading scraper 6 in front of it smooths the powder. Through this bidirectional powder spreading design, the powder spreader can perform powder spreading operations during both forward and backward movements, avoiding the blank time during the reset process of existing powder spreaders, greatly improving powder spreading efficiency and reducing power consumption. Furthermore, the crossbeam 1 includes a first crossbeam and a second crossbeam respectively disposed on the front and rear sides of the powder hopper 2, and the ends of the first and second crossbeams are each provided with a sliding frame 101 for sliding connection with the 3D printing device; the first and second crossbeams are separately disposed and can be connected to the frame of the 3D printing device through the sliding frame 101 respectively, improving the stability of the powder spreader during bidirectional sliding. This effectively suppresses micro-vibrations during high-speed reciprocating motion. Furthermore, an adjustment and locking mechanism 9 is provided between the crossbeam 1 and the sliding frame 101. The adjustment and locking mechanism 9 is used to drive the crossbeam 1 to rotate relative to the sliding frame 101 along an axis parallel to the crossbeam 1 and lock it; the adjustment and locking mechanism 9 allows the crossbeam 1 to be finely adjusted and fixed according to actual needs. By adjusting the locking mechanism 9, the working angle of the powder spreading scraper can be optimized, not only smoothing the powder surface but also producing a certain compaction effect on the powder, forming a denser and flatter powder bed, providing an excellent foundation for subsequent printing and directly improving the quality of part forming. Furthermore, the adjustment and locking mechanism 9 includes an adjustment bolt 92 and a fixing block 91 fixedly connected to the sliding frame 101. The fixing block 91 extends laterally from the sliding frame 101 to the front and / or rear side of the crossbeam 1. The fixing block 91 is provided with an adjustment screw hole corresponding to the front and / or rear side of the crossbeam 1. The adjustment bolt 92 is screwed in or out relative to the adjustment screw hole to abut against the crossbeam 1, thereby causing the crossbeam 1 to rotate backward / forward at a certain angle relative to the sliding frame 101. By screwing in or out the adjustment bolt 92, pressure can be applied to the crossbeam 1 to make it rotate relative to the sliding frame 101, thereby achieving fine-tuning of its angle.

[0017] like Figures 5 to 8As shown, in one embodiment, the lower part of the powder hopper 2 includes two inclined plates 22 arranged opposite each other, with the lower ends of the two inclined plates 22 close to each other to form the discharge port 21 between them; on the front and rear sides of the powder hopper 2, the inclined plates 22 and the powder spreading scraper 6 form a clearance space for accommodating the brush dispersing roller 5. The inclined plates 22 can both guide the powder flow to the discharge port 21 and play a certain role in avoiding obstruction, so that the brush dispersing roller 5 can be installed on the front and rear sides of the powder hopper 2, making the overall structure more compact. Furthermore, a powder gap adjustment plate 8 is installed on the outer side of both inclined plates 22. The powder gap adjustment plate 8 includes several unit plates 82. The lower end of the unit plate 82 extends below the discharge port 21 to guide the powder from the discharge port 21 to the plum blossom powder spreading metering roller 4. The unit plate 82 is connected to the inclined plate 22 through a height adjustment mechanism. The lower end height of each unit plate 82 can be adjusted and fixed independently. By independently adjusting the lower end height of each unit plate, the discharge gap between the powder at the discharge port 21 and the plum blossom powder spreading metering roller 4 can be precisely controlled to be consistent. Especially for bidirectional powder spreaders, it can ensure that the thickness of the powder spreader is uniform during bidirectional powder spreading. When the overall positioning of the powder gap adjustment plate 8 is deviated, or when the plum blossom powder spreading metering roller 4 and the metering groove 41 are bent due to manufacturing precision, the powder gap at different positions of the discharge port 21 can be ensured to be consistent by adjusting the height of each unit plate 82. Furthermore, the height adjustment mechanism includes mounting bolts 83 and a waist-shaped adjustment hole 81 extending vertically on the inclined plate 22. The unit plate 82 is detachably connected to the inclined plate 22 through the waist-shaped adjustment hole 81 and the mounting bolts 83. Further, the height adjustment mechanism also includes a mounting plate 23, through which the unit plate 82 is connected to the outside of the inclined plate 22. The mounting plate 23 includes a contact plate 231 that abuts against the outer wall of the inclined plate 22 and is fixed between the inclined plate 22 and the unit plate 82, and an adjustment plate 232 that is bent outward relative to the contact plate 231. The upper end of the unit plate 82 is bent outward to form a bent plate 821. The adjustment plate 232 and the bent plate 821 are connected by positioning bolts 25 to maintain their relative height. A spring 26 is fitted onto the positioning bolt 25, and the spring 26 is positioned between the adjusting plate 232 and the bending plate 821. Fitting the spring 26 onto the positioning bolt 25 and positioning it between the adjusting plate 232 and the bending plate 821 serves to maintain the relative position of the adjusting plate 232 and the bending plate 821.

[0018] In this embodiment, a support plate 24 is provided between the abutment plate 231 and the adjusting plate 232, and the support plate 24 connects the outer side of the abutment plate 231 and the lower side of the adjusting plate 232. The support plate 24 forms a stable triangular structure between the abutment plate 231 and the adjusting plate 232, which has stability and can evenly transmit the force from the unit plate 82 to the inclined plate 22, avoiding the problem of local stress concentration. In addition, the setting of the support plate 24 also improves the durability of the entire powder spreader. Since the powder hopper 2 is usually equipped with a vibrator 3, the mounting plate 23 will be constantly subjected to vibration and impact. The reinforcement effect of the support plate 24 can reduce the wear and displacement of the mounting plate 23 due to long-term use.

[0019] Furthermore, in the above embodiments, the distance between the axis of the brush dispersing roller 5 and the axis of the plum blossom powder dispersing roller 4 is L, the maximum radius of the brush dispersing roller 5 is R1, the maximum radius of the plum blossom powder dispersing roller 4 is R2, and L < R1 + R2 (refer to...). Figure 9 This allows the brush bristles to extend into the metering groove 41. As those skilled in the art will understand, for the brush dispersing roller 5 and the plum blossom powder metering roller 4 to rotate normally, L has a minimum value, which depends on the length and softness of the brush bristles. The brush dispersing roller 5 can disperse and sweep the powder off the plum blossom powder metering roller 4, avoiding powder clumping and adhesion, ensuring the uniformity and consistency of each layer of powder, and effectively solving the problem of uneven powder distribution caused by powder clumping. An embodiment of a 3D printing device is also provided, which, in the context of the 3D printing device described in the background art ( Figure 1 Based on the above embodiment, this 3D printing device is an improvement; it includes a frame with a powder-spreading plane and a bidirectional powder spreader as described above mounted on the frame. The sliding frame 101 reciprocates with the frame in the longitudinal direction. After the bidirectional powder spreader is installed on the frame, the sliding frame 101 reciprocates along the longitudinal guide rail, driving the bidirectional powder spreader to move back and forth along the powder-spreading plane.

[0020] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0021] In the description of this application, the terms "this embodiment" or "an embodiment," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, mechanisms, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0022] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A 3D printed bidirectional powder spreader, characterized in that, include: The powder spreading frame includes a crossbeam (1), and both ends of the crossbeam (1) are provided with sliding frames (101) for sliding connection with the 3D printing device. The powder hopper (2) is fixedly connected to the crossbeam (1), and the bottom of the powder hopper (2) has a discharge port (21). The plum blossom powder metering roller (4) is rotatably connected to the crossbeam (1) and is arranged parallel to the discharge port (21) of the powder hopper (2). The outer circumferential surface of the plum blossom powder metering roller (4) has metering grooves (41) that extend along its axial direction for metering powder. Two brush dispersing rollers (5) are rotatably connected to the crossbeam (1) and are respectively arranged in parallel on the front and rear sides of the plum blossom powder dispersing roller (4). The surface of the brush dispersing roller (5) is covered with brush bristles. When the brush dispersing roller (5) rotates, the brush bristles extend into the metering groove (41) to sweep away the powdery material. Two powder spreading scrapers (6) are fixedly connected to the crossbeam (1) and are respectively arranged parallel to the front and rear sides of the plum blossom powder spreading metering roller (4), and are respectively located on the side of the two brush dispersing rollers (5) away from the plum blossom powder spreading metering roller (4).

2. The 3D printing bidirectional powder spreader according to claim 1, characterized in that: The crossbeam (1) includes a first crossbeam and a second crossbeam respectively disposed on the front and rear sides of the powder hopper (2), and the ends of the first crossbeam and the second crossbeam are provided with sliding frames (101) for sliding connection with the 3D printing device.

3. A 3D printing bidirectional powder spreader according to claim 1 or 2, characterized in that: An adjustment and locking mechanism (9) is provided between the crossbeam (1) and the sliding frame (101). The adjustment and locking mechanism (9) is used to drive the crossbeam (1) to rotate relative to the sliding frame (101) along an axis parallel to the crossbeam (1) and lock it.

4. A 3D printing bidirectional powder spreader according to claim 3, characterized in that: The adjustment and locking mechanism (9) includes an adjustment bolt (92) and a fixing block (91) fixedly connected to the sliding frame (101), the fixing block (91) extending from the sliding frame (101) to the front and / or rear side of the crossbeam (1); The fixing block (91) is provided with adjusting screw holes at positions corresponding to the front and / or rear sides of the crossbeam (1). The adjusting bolt (92) is screwed in or out relative to the adjusting screw holes to abut against the crossbeam (1), thereby causing the crossbeam (1) to rotate backward / forward at a certain angle relative to the sliding frame (101).

5. A 3D printing bidirectional powder spreader according to claim 1, characterized in that: The lower part of the powder hopper (2) includes two inclined plates (22) arranged opposite each other in front and behind, with the lower ends of the two inclined plates (22) close to each other so that the discharge port (21) is formed between them. On the front and rear sides of the powder hopper (2), a clearance space is formed between the inclined plate (22) and the powder spreading scraper (6) to accommodate the brush dispersing roller (5).

6. A 3D printing bidirectional powder spreader according to claim 5, characterized in that: Both inclined plates (22) are equipped with powder gap adjustment plates (8) on their outer sides. The powder gap adjustment plates (8) include several unit plates (82). The lower end of the unit plates (82) extends to below the discharge port (21) to guide the powder from the discharge port (21) to the plum blossom powder metering roller (4). The unit plates (82) are connected to the inclined plates (22) through a height adjustment mechanism. The lower end height of each unit plate (82) can be adjusted and fixed independently.

7. A 3D printing bidirectional powder spreader according to claim 6, characterized in that: The height adjustment mechanism includes mounting bolts (83) and waist-shaped adjustment holes (81) extending vertically on the inclined plate (22), each of the unit plates (82) being detachably connected to the inclined plate (22) via the waist-shaped adjustment holes (81) and mounting bolts (83).

8. A 3D printing bidirectional powder spreader according to claim 7, characterized in that: The height adjustment mechanism also includes a mounting plate (23), and the unit plate (82) is connected to the outside of the inclined plate (22) through the mounting plate (23); The mounting plate (23) includes an abutment plate (231) that abuts against the outer wall of the inclined plate (22) and is fixed between the inclined plate (22) and the unit plate (82), and an adjustment plate (232) that is bent outward relative to the abutment plate (231). The upper end of the unit plate (82) is bent outward to form a bent plate (821), and the adjusting plate (232) and the bent plate (821) are connected by positioning bolts (25) to maintain their relative height.

9. A 3D printing bidirectional powder spreader according to claim 8, characterized in that: A spring (26) is fitted on the positioning bolt (25), and the spring (26) is limited to the space between the adjusting plate (232) and the bending plate (821).

10. A 3D printing apparatus, comprising a frame, wherein a powder-spreading plane is provided on the frame, characterized in that: The frame is equipped with a 3D printing bidirectional powder spreader as described in any one of claims 1-9, and the sliding frame (101) reciprocates with the frame in the longitudinal direction.

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