A powder spreading scraper device for selective laser sintering

Abstract

The present invention discloses a selective laser sintering powder spreading scraper device, which belongs to the field of laser printing technology and includes a scraper holder, wherein the bottom of the scraper holder is fixedly connected to a protrusion adaptation adjustment component, and the bottom of the protrusion adaptation adjustment component is fixedly connected to a retractable outer folding box. In the present invention, under the action of resistance, the first main scraper and the second main scraper are rotated through the adapter torsion shaft, and the adapter torsion shaft also drives the torsion spring to deform during the rotation process. Under the action of the supporting elastic force of the torsion spring, the first main scraper and the second main scraper will move along the outer tangent surface of the convex point, thereby avoiding the first main scraper and the second main scraper from directly colliding with the convex point to a certain extent, not only playing a good protective role for the first main scraper and the second main scraper, but also avoiding the first main scraper and the second main scraper from generating excessive force when contacting with the convex point, thereby affecting the quality of the laser printed product.

Description

Technical Field

[0001] The invention belongs to the technical field of laser printing, and in particular relates to a selective laser sintering powder spreading scraper device. Background Art

[0002] Selective laser sintering (SLS) printing begins by spreading a layer of powder flat on a worktable. A laser CNC system then controls the laser beam, scanning and irradiating the powder layer according to the cross-sectional contours of that layer, raising the powder temperature to its melting point and shaping it. Once one layer of powder is sintered, the worktable descends to a certain depth. The powder spreading device then evenly spreads another layer of powder on top and begins sintering a new layer. This process repeats until the printed part is complete. Once the workpiece has cooled after being printed, the worktable is raised and the workpiece is removed.

[0003] The prior art discloses some invention patents in the field of laser printing technology, among which Chinese patent CN208116757U discloses a selective laser sintering powder spreading scraper device, including a tool holder, a tool holder, a pressure plate and a scraper. The tool holder is a cylindrical structure with a square base at the root, wherein the tool holder is tightly clamped to the cylinder of the tool holder by a first screw. When the first screw is loosened, the tool holder can rotate around the cylinder of the tool holder. The pressure plate is fixed to the tool holder by a second screw and presses the scraper on the tool holder. In this technical solution, the scraper is elastic. When the scraper touches the raised point and generates an upward component force, it can be elastically deformed and can pass over the smaller raised high points that appear during the printing process, thereby minimizing the risks and possibilities of failure during the printing process, ensuring the smooth progress of the powder spreading process, and effectively improving the printing success rate.

[0004] The selective laser sintering powder scraper device in the existing technology still has some shortcomings during use, mainly in two aspects. First, because laser sintering is a layer-by-layer forming process, the scraper will scrape multiple times in places with smaller size contours of the sintered workpiece, so that the scraper will scrape up the protruding parts of the sintered workpiece or even bring out the sintered workpiece, resulting in printing failure. Second, when the scraper spreads powder, powder will be left on the protruding parts of the printed workpiece, thereby affecting the subsequent laser sintering printing effect.

[0005] Based on this, the present invention designs a selective laser sintering powder spreading scraper device to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to solve the problem that the selective laser sintering powder scraper device in the prior art still has some shortcomings during use. When the scraper comes into contact with the protrusion, the scraper flips over and bypasses the protrusion, and then resets after bypassing the protrusion to continue scraping powder. In the process of the scraper bypassing the protrusion, some powder will remain, which will affect the subsequent laser sintering printing effect. A selective laser sintering powder scraper device is proposed.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A selective laser sintering powder spreading scraper device includes a scraper holder, a raised adaptive adjustment component fixedly connected to the bottom of the scraper holder, a retractable outer stacking box fixedly connected to the bottom of the raised adaptive adjustment component, a flip buffer component sleeved inside the retractable outer stacking box, an elastic support component fixedly connected to the side end surface of the flip buffer component, and an end of the elastic support component away from the flip buffer component embedded in a directional retraction hole provided in the bottom of the retractable outer stacking box;

[0009] A wedge-shaped seat is fixedly connected to the inner side wall of the retractable outer stacking box at a position corresponding to the flip buffer assembly, so as to be subjected to a downward squeezing force when the flip buffer assembly flips;

[0010] The bottom of the flip buffer assembly is fixedly connected to a switching assembly, and the bottom of the switching assembly is embedded with a powder spreading and leveling assembly;

[0011] The flip buffer assembly includes a retractable inner stacking box, the retractable inner stacking box is slidably connected to the port at the bottom of the retractable outer stacking box, the interior of the retractable inner stacking box is rotatably connected to the flip knife holder through a bearing, the end of the flip knife holder is sleeved with a flip spring, one end of the flip spring is fixedly connected to the outer surface of the flip knife holder, and the other end of the flip spring is fixedly connected to the end surface of the inner side of the retractable inner stacking box;

[0012] The adapter assembly includes a strip-shaped blade holder, the top of which is fixedly connected to the bottom of the flip blade holder, and the end of the strip-shaped blade holder is rotatably connected to multiple groups of adapter torsion shafts through bearings, and two adjacent adapter torsion shafts are arranged linearly, and the number of adapter torsion shafts in each group is two, and a torsion spring is sleeved on the surface of the adapter torsion shaft, one end of the torsion spring is fixedly connected to the bottom of the strip-shaped blade holder, and the other end of the torsion spring is fixedly connected to the outer surface of the adapter torsion shaft;

[0013] The powder spreading and scraping assembly includes a first main scraper and a second main scraper, and the second main scraper and the first main scraper are respectively embedded with a second auxiliary scraper and a first auxiliary scraper. The side of the first auxiliary scraper facing away from the second auxiliary scraper is fixedly connected to the end face inside the first main scraper through a first scraper spring, and the side of the second auxiliary scraper facing away from the first auxiliary scraper is fixedly connected to the end face inside the second main scraper through a second scraper spring.

[0014] As a further description of the above technical solution:

[0015] The raised adaptation adjustment assembly includes a transverse sliding box, the top of the transverse sliding box is fixedly connected to a pad, the top of the pad is fixedly connected to the bottom of the scraper frame, the bottom of the transverse sliding box is provided with a through-connection port, the through-connection port and the transverse sliding box are slidably connected with the same group of transverse sliding seats, and the side end face of the transverse sliding seat is fixedly connected to the inner end face of the transverse sliding box through a hydraulic cylinder.

[0016] As a further description of the above technical solution:

[0017] The outer surface of the transverse slide box is slidably connected to a transverse slide frame, the bottom of the inner side of the transverse slide frame is fixedly connected to the bottom of the transverse slide seat, and the cross-sectional shape of the transverse slide seat in side view is an inverted convex shape;

[0018] The top of the retractable outer stacking box is fixedly connected to the bottom of the transverse sliding frame.

[0019] As a further description of the above technical solution:

[0020] A plug hole is provided on the side end surface of the scraper frame, and a sensor device is embedded in the plug hole.

[0021] As a further description of the above technical solution:

[0022] The outer surface of the flip tool holder is sleeved with a flip protrusion, which is arranged at a position corresponding to the wedge-shaped seat and is used to generate a downward extrusion force when the flip tool holder performs a flipping movement.

[0023] As a further description of the above technical solution:

[0024] The elastic support assembly includes a side rib plate, the side rib plate is fixedly connected to the side end surface of the retractable inner stacking box, the top of the side rib plate is fixedly connected to a directional telescopic rod, and the other end of the directional telescopic rod is embedded in the directional retracting hole;

[0025] The outer surface of the directional telescopic rod is sleeved with a support spring, and the two ends of the support spring are respectively fixedly connected to the side ribs and the opposite surfaces of the retractable outer stacking box.

[0026] As a further description of the above technical solution:

[0027] The relative positions of the tops of the first main scraper and the second main scraper are fixedly connected with regular polygonal prisms, and the regular polygonal prisms are embedded in the regular polygonal grooves opened at the bottom of the adapter torsion shaft.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0029] 1. In the present invention, when the powder spreading and scraping assembly corresponding to the convex point comes into contact with the convex point, the convex point will generate resistance to the powder spreading and scraping assembly. Under the action of the resistance, the first main scraper and the second main scraper are rotated through the adapter torsion shaft. The adapter torsion shaft will also drive the torsion spring to deform during the rotation process. Under the action of the supporting elastic force of the torsion spring, the first main scraper and the second main scraper will move along the outer tangent surface of the convex point, thereby avoiding the direct collision between the first main scraper and the second main scraper and the convex point to a certain extent. It not only plays a good protective role for the first main scraper and the second main scraper, but also can avoid the excessive force generated by the contact between the first main scraper and the second main scraper and the convex point, which affects the quality of the laser printing product.

[0030] 2. In the present invention, the first auxiliary scraper and the second auxiliary scraper are respectively extended from the inner sides of the first main scraper and the second main scraper. Under the joint action of the first auxiliary scraper, the second auxiliary scraper, the first main scraper and the second main scraper, the function of multiple powder scraping of the convex area is realized, thereby effectively improving the flatness of the convex area after powder spreading and scraping.

[0031] 3. In the present invention, during the process of the first main scraper and the second main scraper coming into contact with the protrusion, due to the existence of a certain interaction force between the first main scraper and the second main scraper and the protrusion, the flip tool holder rotates under the interaction and drives the torsion spring to deform. At the same time, the flip protrusion will also slide on the inclined surface of the wedge seat, and the flip tool holder will be subjected to a downward force, causing the inclined first main scraper and the second main scraper to move downward. On the one hand, it is beneficial to further reduce the interaction force between the first main scraper and the second main scraper and the protrusion. On the other hand, the first main scraper and the second main scraper in the inclined state can intercept more powder, which is beneficial to improve the powder leveling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the overall structure of a selective laser sintering powder spreading scraper device proposed by the present invention;

[0033] Figure 2 This is a schematic diagram of the left and right isometric axial structure of a selective laser sintering powder spreading scraper device proposed by the present invention;

[0034] Figure 3 This is a schematic diagram of the upper and lower isometric axial structure of a selective laser sintering powder spreading scraper device proposed by the present invention;

[0035] Figure 4 This is a schematic structural diagram of a powder spreading scraper device for selective laser sintering proposed by the present invention from another perspective;

[0036] Figure 5This is a schematic structural diagram of a protrusion adaptation adjustment component in a selective laser sintering powder spreading scraper device proposed by the present invention;

[0037] Figure 6 This is a schematic structural diagram of a powder spreading and leveling component in a selective laser sintering powder spreading and leveling scraper device proposed by the present invention;

[0038] Figure 7 This is a schematic structural diagram of a flip protrusion in a selective laser sintering powder spreading scraper device proposed by the present invention;

[0039] Figure 8 A selective laser sintering powder scraper device proposed by the present invention Figure 7 Schematic diagram of the structure of A in the middle;

[0040] Figure 9 This is a schematic structural diagram of a flip buffer assembly in a selective laser sintering powder spreading scraper device proposed by the present invention;

[0041] Figure 10 This is a schematic structural diagram of a wedge-shaped seat in a selective laser sintering powder spreading scraper device proposed by the present invention;

[0042] Figure 11 This is a schematic structural diagram of an elastic support assembly in a selective laser sintering powder spreading scraper device proposed by the present invention.

[0043] Legend:

[0044] 1. Scraper holder; 2. Protrusion adaptation adjustment component; 201. Horizontal sliding box; 202. Horizontal sliding seat; 203. Hydraulic cylinder; 204. Horizontal sliding frame; 3. Retract outer stacking box; 4. Directional retraction hole; 5. Flip buffer assembly; 501. Retract inner stacking box; 502. Flip blade holder; 503. Flip spring; 504. Flip protrusion; 505. Docking port; 6. Wedge seat; 7. Elastic support assembly; 701. Side rib; 702. Directional telescopic rod; 703. Support spring; 8. Adapter assembly; 801. Strip blade holder; 802. Adapter torsion shaft; 803. Torsion spring; 9. Powder spreading and leveling assembly; 901. First main scraper; 902. First auxiliary scraper; 903. First scraper spring; 904. Second main scraper; 905. Second auxiliary scraper; 906. Second scraper spring; 10. Sensing device. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] See also Figure 1-11 The present invention provides a technical solution: a selective laser sintering powder spreading scraper device, comprising a scraper frame 1, a raised adaptive adjustment component 2 fixedly connected to the bottom of the scraper frame 1, a retractable outer stacking box 3 fixedly connected to the bottom of the raised adaptive adjustment component 2, a flip buffer component 5 sleeved inside the retractable outer stacking box 3, an elastic support component 7 fixedly connected to the side end surface of the flip buffer component 5, and an end of the elastic support component 7 away from the flip buffer component 5 embedded in a directional retraction hole 4 opened in the bottom of the retractable outer stacking box 3;

[0047] A wedge-shaped seat 6 is fixedly connected to the position of the inner side wall of the retracted outer stacking box 3 corresponding to the flip buffer assembly 5, so as to be subjected to a downward squeezing force when the flip buffer assembly 5 flips;

[0048] The bottom of the flipping buffer component 5 is fixedly connected to the adapter component 8, and the bottom of the adapter component 8 is embedded with a powder spreading and leveling component 9.

[0049] Specifically, the raised adaptive adjustment component 2 includes a transverse sliding box 201, the top of the transverse sliding box 201 is fixedly connected to a pad, the top of the pad is fixedly connected to the bottom of the scraper frame 1, the bottom of the transverse sliding box 201 is provided with a through-connection port, the through-connection port and the transverse sliding box 201 are slidably connected with the same group of transverse sliding seats 202, the side end surface of the transverse sliding seat 202 is fixedly connected to the inner end surface of the transverse sliding box 201 through a hydraulic cylinder 203, the outer surface of the transverse sliding box 201 is slidably connected to a transverse sliding frame 204, the bottom of the inner side of the transverse sliding frame 204 is fixedly connected to the bottom of the transverse sliding seat 202, and the cross-sectional shape of the transverse sliding seat 202 when viewed from the side is an inverted convex shape;

[0050] The top of the retracted outer stacking box 3 is fixedly connected to the bottom of the transverse slide frame 204. The side end surface of the scraper frame 1 is provided with a plug hole, and a sensor device 10 is embedded in the plug hole.

[0051] The specific implementation method is as follows: after the powder is spread, the scraper frame 1 is driven to simultaneously drive multiple groups of first main scrapers 901 and second main scrapers 904 to scrape the powder flat. During this process, the sensor device 10 monitors in real time whether there is a protrusion in the moving direction of the scraper frame 1. If a protrusion is found, the system will adjust the nearest powder spreading and scraping component 9 to move in the lateral direction according to the vertical distance until the gap between the first main scraper 901 and the second main scraper 904 built into the powder spreading and scraping component 9 is perpendicular to the protrusion. Control the hydraulic cylinder 203 to perform corresponding telescopic movement. The hydraulic cylinder 203 applies tension or thrust to the transverse sliding seat 202. Under the action of the tension or thrust, the transverse sliding seat 202 performs a corresponding and stable sliding action in the transverse sliding box 201. The transverse sliding seat 202 indirectly applies linear thrust or tension to the powder laying and leveling component 9 through the transverse sliding frame 204. After completing the vertical positioning of the gap between the first main scraper 901 and the second main scraper 904 and the protrusion, the system controls the scraper frame 1 to continue to move forward.

[0052] Specifically, the flip buffer assembly 5 includes a retractable inner stacking box 501, which is slidably connected to the port at the bottom of the retractable outer stacking box 3. The interior of the retractable inner stacking box 501 is rotatably connected to the flip tool holder 502 through a bearing. The end of the flip tool holder 502 is sleeved with a flip spring 503. One end of the flip spring 503 is fixedly connected to the outer surface of the flip tool holder 502, and the other end of the flip spring 503 is fixedly connected to the end face on the inner side of the retractable inner stacking box 501. The outer surface of the flip tool holder 502 is sleeved with a flip protrusion 504. The flip protrusion 504 is set corresponding to the position of the wedge seat 6, which is used to generate a downward extrusion force when the flip tool holder 502 performs a flipping movement.

[0053] The specific implementation method is as follows: during the process of the first main scraper 901 and the second main scraper 904 coming into contact with the protrusion, since there is a certain interaction force between the first main scraper 901 and the second main scraper 904 and the protrusion, the flip tool holder 502 rotates under the interaction and drives the torsion spring 803 to deform. At the same time, the flip protrusion 504 will also slide on the inclined surface of the wedge seat 6, and the flip tool holder 502 will be subjected to a downward force, causing the inclined first main scraper 901 and the second main scraper 904 to move downward.

[0054] Specifically, the elastic support assembly 7 includes a side rib 701, which is fixedly connected to the side end surface of the retractable inner stacking box 501. The top of the side rib 701 is fixedly connected to a directional telescopic rod 702, and the other end of the directional telescopic rod 702 is embedded in the directional retraction hole 4;

[0055] The outer surface of the directional telescopic rod 702 is sleeved with a support spring 703, and the two ends of the support spring 703 are fixedly connected to the opposite surfaces of the side ribs 701 and the retracted outer stacking box 3 respectively. The adapter assembly 8 includes a strip knife holder 801, the top of the strip knife holder 801 is fixedly connected to the bottom of the flip knife holder 502, and the end of the strip knife holder 801 is rotatably connected to multiple groups of adapter torsion shafts 802 through bearings, and two adjacent adapter torsion shafts 802 are arranged linearly, and the number of each group of adapter torsion shafts 802 is two, and the surface of the adapter torsion shaft 802 is sleeved with a torsion spring 803, one end of the torsion spring 803 is fixedly connected to the bottom of the strip knife holder 801, and the other end of the torsion spring 803 is fixedly connected to the outer surface of the adapter torsion shaft 802. The powder spreading and leveling assembly 9 includes a first main scraper 901 and a second main scraper 904. The second main scraper 904 and the first main scraper 901 are respectively embedded with a second auxiliary scraper 905 and a first auxiliary scraper 902. The side of the first auxiliary scraper 902 facing away from the second auxiliary scraper 905 is fixedly connected to the inner end face of the first main scraper 901 through a first scraper spring 903. The side of the second auxiliary scraper 905 facing away from the first auxiliary scraper 902 is fixedly connected to the inner end face of the second main scraper 904 through a second scraper spring 906. The relative positions of the tops of the first main scraper 901 and the second main scraper 904 are fixedly connected with regular polygonal prisms, which are embedded in the regular polygonal grooves opened at the bottom of the adapter torsion shaft 802.

[0056] The specific implementation method is as follows: when the powder spreading and leveling component 9 corresponding to the convex point comes into contact with the convex point, the convex point will generate resistance to the powder spreading and leveling component 9. Under the action of the resistance, the first main scraper 901 and the second main scraper 904 rotate through the adapter torsion shaft 802. During the rotation, the adapter torsion shaft 802 will also drive the torsion spring 803 to deform. Under the action of the supporting elastic force of the torsion spring 803, the first main scraper 901 and the second main scraper 904 will move along the outer tangent surface of the convex point.

[0057] Working principle, when using:

[0058] During the laser sintering printing process, first spread the powder, then scrape it flat, and then proceed with laser sintering printing after the scraping is completed;

[0059] After the powder is spread, the scraper frame 1 is driven to simultaneously drive multiple groups of first main scrapers 901 and second main scrapers 904 to scrape the powder flat. During this process, the sensor device 10 monitors in real time whether there is a protrusion in the moving direction of the scraper frame 1. If a protrusion is found, the system will adjust the nearest powder spreading and scraping component 9 to move in the lateral direction according to the vertical distance until the gap between the first main scraper 901 and the second main scraper 904 built into the powder spreading and scraping component 9 is perpendicular to the protrusion, and the hydraulic pressure is controlled. The cylinder 203 performs corresponding telescopic movement, and the hydraulic cylinder 203 applies a pulling force or a thrust to the transverse sliding seat 202. Under the action of the pulling force or the thrust, the transverse sliding seat 202 performs a corresponding and stable sliding action in the transverse sliding box 201. The transverse sliding seat 202 indirectly applies a linear thrust or a pulling force to the powder spreading and leveling component 9 through the transverse sliding frame 204. After the gap between the first main scraper 901 and the second main scraper 904 is vertically positioned with the protrusion, the system controls the scraper frame 1 to continue to move forward;

[0060] When the powder spreading and leveling assembly 9 corresponding to the convex point comes into contact with the convex point, the convex point will generate resistance to the powder spreading and leveling assembly 9. Under the action of the resistance, the first main scraper 901 and the second main scraper 904 rotate via the adapter torsion shaft 802. The adapter torsion shaft 802 also drives the torsion spring 803 to deform during the rotation process. Under the support elastic force of the torsion spring 803, the first main scraper 901 and the second main scraper 904 will move along the outer tangent surface of the convex point, thereby avoiding the first main scraper 901 and the second main scraper 904 from directly colliding with the convex point to a certain extent, which not only plays a good protective role for the first main scraper 901 and the second main scraper 904, but also can avoid the first main scraper 901 and the second main scraper 904 from generating excessive force when contacting with the convex point, thereby affecting the quality of the laser printing product.

[0061] During the process of the first main scraper 901 and the second main scraper 904 moving along the outer tangential surface of the convex point, the first auxiliary scraper 902 and the second auxiliary scraper 905 are extended from the inner sides of the first main scraper 901 and the second main scraper 904 respectively under the joint effect of the first scraper spring 903 and the second scraper spring 906. Under the joint action of the first auxiliary scraper 902, the second auxiliary scraper 905, the first main scraper 901 and the second main scraper 904, multiple powder scraping functions are achieved in the convex point area, effectively improving the flatness of the convex point area after powder spreading and scraping.

[0062] During the process of the first main scraper 901 and the second main scraper 904 coming into contact with the protrusion, since there is a certain interaction force between the first main scraper 901 and the second main scraper 904 and the protrusion, the flip knife holder 502 rotates under the interaction and drives the torsion spring 803 to deform. At the same time, the flip protrusion 504 will also slide on the inclined surface of the wedge seat 6, and the flip knife holder 502 will be subjected to a downward force, causing the inclined first main scraper 901 and the second main scraper 904 to move downward. On the one hand, it is beneficial to further reduce the interaction force between the first main scraper 901 and the second main scraper 904 and the protrusion. On the other hand, the first main scraper 901 and the second main scraper 904 in the inclined state can intercept more powder, which is beneficial to improve the powder leveling effect.

[0063] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A selective laser sintering powder spreading scraper device, comprising a scraper holder (1), characterized in that: The bottom of the scraper frame (1) is fixedly connected to a protruding adaptive adjustment component (2), the bottom of the protruding adaptive adjustment component (2) is fixedly connected to a retractable outer stacking box (3), the interior of the retractable outer stacking box (3) is sleeved with a flip buffer component (5), the side end face of the flip buffer component (5) is fixedly connected to an elastic support component (7), and one end of the elastic support component (7) away from the flip buffer component (5) is embedded in a directional retraction hole (4) opened at the bottom of the retractable outer stacking box (3); A wedge-shaped seat (6) is fixedly connected to the inner side wall of the retractable outer stacking box (3) at a position corresponding to the flip buffer assembly (5), and is used to receive a downward squeezing force when the flip buffer assembly (5) flips; The bottom of the turnover buffer component (5) is fixedly connected to a switching component (8), and the bottom of the switching component (8) is embedded with a powder spreading and leveling component (9); The flip buffer assembly (5) includes a retractable inner stacking box (501), the retractable inner stacking box (501) is slidably connected to the port at the bottom of the retractable outer stacking box (3), the interior of the retractable inner stacking box (501) is rotatably connected to a flip knife holder (502) via a bearing, the end of the flip knife holder (502) is sleeved with a flip spring (503), one end of the flip spring (503) is fixedly connected to the outer surface of the flip knife holder (502), and the other end of the flip spring (503) is fixedly connected to the end surface of the inner side of the retractable inner stacking box (501); The adapter assembly (8) includes a strip-shaped blade holder (801), the top of the strip-shaped blade holder (801) is fixedly connected to the bottom of the flip blade holder (502), the end of the strip-shaped blade holder (801) is rotatably connected to multiple groups of adapter torsion shafts (802) through bearings, and two adjacent adapter torsion shafts (802) are arranged linearly, and the number of each group of adapter torsion shafts (802) is two, and the surface of the adapter torsion shaft (802) is sleeved with a torsion spring (803), one end of the torsion spring (803) is fixedly connected to the bottom of the strip-shaped blade holder (801), and the other end of the torsion spring (803) is fixedly connected to the outer surface of the adapter torsion shaft (802); The powder spreading and leveling assembly (9) comprises a first main scraper (901) and a second main scraper (904), wherein a second auxiliary scraper (905) and a first auxiliary scraper (902) are respectively embedded in the interior of the second main scraper (904) and the first main scraper (901), and a side of the first auxiliary scraper (902) facing away from the second auxiliary scraper (905) is fixedly connected to the inner end face of the first main scraper (901) via a first scraper spring (903), and a side of the second auxiliary scraper (905) facing away from the first auxiliary scraper (902) is fixedly connected to the inner end face of the second main scraper (904) via a second scraper spring (906).

2. A selective laser sintering powder spreading scraper device according to claim 1, characterized in that: The protrusion adaptation adjustment component (2) comprises a transverse sliding box (201), the top of the transverse sliding box (201) is fixedly connected to a pad, the top of the pad is fixedly connected to the bottom of the scraper frame (1), the bottom of the transverse sliding box (201) is provided with a through-connection port, the through-connection port and the transverse sliding box (201) are slidably connected to the same group of transverse sliding seats (202), and the side end surface of the transverse sliding seat (202) is fixedly connected to the inner end surface of the transverse sliding box (201) through a hydraulic cylinder (203).

3. The selective laser sintering powder spreading scraper device according to claim 2, characterized in that: The outer surface of the transverse sliding box (201) is slidably connected to a transverse sliding frame (204), the bottom of the inner side of the transverse sliding frame (204) is fixedly connected to the bottom of the transverse sliding seat (202), and the cross-sectional shape of the transverse sliding seat (202) in a side view is an inverted convex shape; The top of the retractable outer stacking box (3) is fixedly connected to the bottom of the transverse sliding frame (204).

4. The selective laser sintering powder spreading scraper device according to claim 1, characterized in that: A plug hole is provided on the side end surface of the scraper frame (1), and a sensor device (10) is embedded and connected in the plug hole.

5. The selective laser sintering powder spreading scraper device according to claim 1, characterized in that: The outer surface of the flip tool holder (502) is sleeved with a flip protrusion (504), and the flip protrusion (504) is arranged corresponding to the position of the wedge seat (6) and is used to generate a downward extrusion force when the flip tool holder (502) performs a flipping movement.

6. The selective laser sintering powder spreading scraper device according to claim 5, characterized in that: The elastic support assembly (7) includes a side rib plate (701), the side rib plate (701) is fixedly connected to the side end surface of the retractable inner stacking box (501), the top of the side rib plate (701) is fixedly connected to a directional telescopic rod (702), and the other end of the directional telescopic rod (702) is embedded in the directional retractable hole (4); The outer surface of the directional telescopic rod (702) is sleeved with a support spring (703), and the two ends of the support spring (703) are respectively fixedly connected to the side ribs (701) and the opposite surfaces of the retractable outer stacking box (3).

7. The selective laser sintering powder spreading scraper device according to claim 1, characterized in that: Regular polygonal prisms are fixedly connected to the relative positions of the tops of the first main scraper (901) and the second main scraper (904), and the regular polygonal prisms are embedded in the regular polygonal grooves opened at the bottom of the switching torsion shaft (802).

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