A powder spreading device for a 3D printer

Abstract

The application relates to the technical field of 3D printers, and discloses a 3D printer powder spreading device, which comprises a workbench, a powder supply box is fixedly installed on the top of the workbench, two printing tables are symmetrically arranged above the powder supply box, one end of the two printing tables is attached to each other, a top plate frame is arranged above the two printing tables, a printing head is arranged on the bottom surface of the top plate frame, a scraper is arranged on one side of the printing head, a feeding assembly for driving the printing tables to descend and fish powder is arranged on the side of the two printing tables, and a shaking assembly for driving the printing tables to be raised is further arranged on the side of the two printing tables. The powder supply box is arranged below the printing tables, the two printing tables are automatically lowered through the feeding assembly, and powder is fished to the upper surfaces of the two printing tables, so that the step of repeatedly transferring excess powder is avoided, the operation process is simplified, meanwhile, the problem that the powder is easily polluted or lost during repeated transfer and affects the printing quality is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of 3D printers, and particularly relates to a 3D printer powder spreading device. BACKGROUND

[0002] 3D printing is a kind of rapid prototyping technology, also known as additive manufacturing, which is a technology for constructing objects through layer-by-layer printing based on digital model files and using powder-like metal or plastic and other materials that can be bonded. 3D printing is usually realized by using a digital technology material printer. It is often used in mold manufacturing, industrial design and other fields to manufacture models, and is gradually used for direct manufacturing of some products. There are parts printed by using this technology.

[0003] The existing printer spreads powder by setting a powder supply box above the printing table to supply powder, spreading the powder along the surface of the printing table by a scraper, and then dropping the excess powder into the overflow box for collection. The excess powder in the overflow box needs to be re-introduced into the powder supply box, which is troublesome and may contaminate or lose the powder during repeated transfer.

[0004] Therefore, the application provides a 3D printer powder spreading device. SUMMARY

[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem in the background art.

[0006] The technical scheme adopted by the application to solve the technical problem is: the 3D printer powder spreading device comprises a workbench, a powder supply box is fixedly installed on the top of the workbench, two printing tables are symmetrically arranged above the powder supply box, one end of each of the two printing tables is attached to the other, a top plate frame is arranged above the two printing tables, a print head is arranged on the bottom surface of the top plate frame, a scraper is arranged on one side of the print head, a powder spreading assembly is arranged above the scraper for driving the scraper to move horizontally along the top of the printing table, an upper material assembly is arranged on the side of each of the two printing tables for driving the printing table to descend and collect powder, and a shaking assembly is arranged on the side of each of the two printing tables for driving the printing table to be raised.

[0007] Preferably, the bottom surface of the powder supply box is arc-shaped, and the end of each of the two printing tables away from the other is arranged in an inclined angle shape, and the width of the printing table is the same as the width of the inner wall of the powder supply box.

[0008] Preferably, the feeding assembly comprises two fixed shafts, the two fixed shafts are fixedly connected with the inner walls of the two ends of the printing table close to each other, the two ends of the fixed shaft are fixedly connected with inner sliding blocks, the outer walls of the inner sliding blocks are slidably connected with vertical sliding seats, the top of the workbench is fixedly provided with a plurality of hydraulic cylinders, the vertical sliding seats are fixedly installed above the hydraulic cylinders, the output ends of the plurality of hydraulic cylinders are fixedly connected with the bottom surfaces of the inner sliding blocks, and one side of the printing table is provided with a turnover assembly for driving the printing table to turn over.

[0009] Preferably, the turnover assembly comprises two gears, the two gears are fixedly connected to the outer walls of the two fixed shafts, the lower sides of the gears are provided with rack plates, the teeth of the rack plates can be engaged with the teeth of the gears, the number of the teeth of the rack plates is one fourth of the number of the teeth of the gears, and one side of the two rack plates is provided with a magnetic assembly for driving the rack plates to descend.

[0010] Preferably, the magnetic assembly comprises a fixed sliding seat, the fixed sliding seat is fixedly installed on the top of the workbench, the inner wall of the fixed sliding seat is slidably connected with a lifting sliding block, the two sides of the lifting sliding block are fixedly connected with one side of the rack plate, the lifting sliding block is made of iron material, the inner wall bottom of the fixed sliding seat is provided with a magnet, the top of the lifting sliding block is fixedly connected with a return spring, and one end of the return spring away from the lifting sliding block is fixedly connected with the inner wall surface of the top of the fixed sliding seat.

[0011] Preferably, the shaking assembly comprises two connecting long rods, the two connecting long rods are fixedly connected to the outer walls of the two fixed shafts, the inner walls of the two connecting long rods are fixedly connected with connecting pieces, the connecting pieces are fixedly connected with straight electric sliding rails, the inner walls of the straight electric sliding rails are slidably connected with straight electric sliding blocks, the tops of the straight electric sliding blocks are fixedly connected with fixed plates, the tops of the fixed plates are symmetrically fixedly connected with arc-shaped electric sliding rails, the inner walls of the arc-shaped electric sliding rails are slidably connected with arc-shaped electric sliding blocks, and the two arc-shaped electric sliding blocks are fixedly connected with a clamping piece.

[0012] Preferably, the top of the powder supply box is fixedly connected with a limiting bin, the inner wall width of the limiting bin is same as the width of the printing table, and the inner wall length of the limiting bin is same as the sum of the lengths of the two printing tables.

[0013] Preferably, the powder spreading assembly comprises two fixed seats, the two fixed seats are fixedly installed on the bottom of the top plate frame, the inner walls of the two fixed seats are rotatably connected with threaded conveying rods, the outer walls of the threaded conveying rods are threadedly connected with inner threaded blocks, the inner threaded blocks are slidably connected with the inner walls of the fixed seats, the bottoms of the two inner threaded blocks are fixedly connected with the top of the anti-overflow plate, one end of each of the two threaded conveying rods is fixedly connected with a transmission ring, the outer walls of the two transmission rings are transmissionally connected with a transmission belt, and one end of one of the threaded conveying rods is fixedly connected with a motor.

[0014] Preferably, the two sides of the scraper are symmetrically and fixedly connected with the anti-overflow plates, and the two ends of the limiting bin are fixedly connected with the slope plates.

[0015] Preferably, the bottom of the top plate frame is fixedly connected with a plurality of electric control telescopic rods, and the electric control telescopic rods are respectively fixedly installed at the top of the vertical sliding seat.

[0016] The beneficial effects of the present application are as follows:

[0017] 1. The powder laying device of the 3D printer, the powder supply box is arranged below the printing table, the two printing tables are automatically lowered through the feeding assembly, and the powder is fished to the upper surface thereof, compared with the existing printer, the powder in the powder supply box needs to be first laid flat on the printing table through the scraper, then the excess powder is scraped into the overflow box, and then the powder in the overflow box is introduced into the powder supply box again, when the excess powder is scraped, the powder can directly fall into the interior of the powder supply box for recycling, the step of transferring the excess powder multiple times is avoided, the operation process is simplified, and the problem that the powder is easily polluted or lost during multiple transfers and affects the printing quality is avoided.

[0018] 2. The powder laying device of the 3D printer, a part of the powder is dispersed along the middle position of the printing table through the shaking assembly, the powder is uniformly distributed above the printing table, and on the basis that the powder is uniformly distributed, the scraper can more smoothly and accurately move above the printing table to uniformly lay the powder. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described below with reference to the drawings.

[0020] Figure 1 is the overall perspective view of the present application;

[0021] Figure 2 is the structure schematic view of the scraper in the present application;

[0022] Figure 3 is the structure schematic view of the workbench in the present application;

[0023] Figure 4 is the structure schematic view of the vertical sliding seat in the present application;

[0024] Figure 5 is the structure schematic view of the printing table in the present application;

[0025] Figure 6 is the structure schematic view of the powder supply box in the present application;

[0026] Figure 7 is the structure schematic view through the magnet in the present application;

[0027] Figure 8It is the structure schematic view of straight electric slide rail in the application.

[0028] Figure 9 It is the structure schematic view of connecting long rod in the application.

[0029] In the figure: 1, workbench; 2, printing table; 3, powder supply box; 4, scraper; 5, anti-overflow plate; 6, internal threaded block; 7, fixed seat; 8, threaded conveying rod; 9, transmission ring; 10, transmission belt; 11, top plate frame; 12, printing head; 13, electric control telescopic rod; 14, motor; 15, fixed shaft; 16, inner sliding block; 17, vertical sliding seat; 18, hydraulic cylinder; 19, gear; 20, rack plate; 21, lifting sliding block; 22, fixed sliding seat; 23, return spring; 24, through magnet; 25, limiting bin; 26, connecting long rod; 27, connecting piece; 28, straight electric slide rail; 29, straight electric sliding block; 30, fixed plate; 31, arc-shaped electric slide rail; 32, clamping piece; 33, arc-shaped electric sliding block; 34, slope plate. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, purposes and effects realized by the application easy to understand, the application is further described below in combination with specific embodiments.

[0031] As Figures 1 to 9 shown, the application provides a technical solution: a 3D printer powder spreading device, comprising a workbench 1, the top of the workbench 1 is fixedly installed with a powder supply box 3, the upper part of the powder supply box 3 is symmetrically provided with two printing tables 2, one end of the two printing tables 2 is adhered to each other, the upper part of the two printing tables 2 is provided with a top plate frame 11, the bottom surface of the top plate frame 11 is provided with a printing head 12, one side of the printing head 12 is provided with a scraper 4, the upper part of the scraper 4 is provided with a powder spreading assembly for driving the scraper 4 to move horizontally along the upper part of the printing table 2, the side of the two printing tables 2 is provided with a feeding assembly for driving the printing table 2 to descend and collect powder, and the side of the two printing tables 2 is further provided with a shaking assembly for driving the printing table 2 to be raised.

[0032] When working: the powder required by the 3D printer is added to the inside of the powder supply box 3, when the upper surface of the printing table 2 needs to be filled with powder, the feeding assembly is started, the feeding assembly first drives the two printing tables 2 to descend, when the two printing tables 2 just start to descend, the two printing tables 2 will be flipped, and the two printing tables 2 will gradually change from a horizontal state to a vertical state during the flipping, then when the two printing tables 2 continue to descend, they will gradually enter the inside of the powder supply box 3 and insert into the powder in the inside of the powder supply box 3, when the bottom of the printing table 2 completely fits the bottom of the powder supply box 3, the two printing tables 2 will be flipped back to the horizontal state, and the powder in the inside of the powder supply box 3 will be automatically salvaged to the upper surface of the two printing tables 2, after the salvaging through this way, most of the powder will be concentrated on the side away from each other of the two printing tables 2, at this time, the shaking assembly is used to make the side away from each other of the two printing tables 2 tilt upward, so as to realize shaking, during the shaking, some powder will gather from the side away from each other of the two printing tables 2 to the middle position of the two printing tables 2, so that the powder is evenly distributed above the two printing tables 2, after completion, the printing table 2 is raised to reset, at this time, the powder spreading assembly drives the scraper 4 to move horizontally above the printing table 2, during the moving, the powder is evenly spread, and the spread powder is 3D printed by the printing head 12;

[0033] Through the above embodiment, the powder supply box 3 is arranged below the printing table 2, the two printing tables 2 are automatically lowered by the feeding assembly, and the powder is salvaged to the upper surface of the two printing tables 2, compared with the existing printer, when spreading powder, the powder in the powder supply box needs to be first spread on the printing table 2 by the scraper 4, then the excess powder is scraped into the overflow box, and then the powder in the overflow box is introduced into the powder supply box again, when the excess powder is scraped, the powder can directly fall into the inside of the powder supply box 3 for recycling, avoiding the steps of transferring the excess powder for multiple times, simplifying the operation process, and avoiding the problem that the powder is easily contaminated or lost during multiple transfers, affecting the printing quality; and through the shaking assembly, a part of the powder is dispersed along the middle position of the printing table 2, and the powder is evenly distributed above the printing table 2, and on the basis of the even distribution of the powder, the scraper 4 can more smoothly and accurately move above the printing table 2, and the powder is evenly spread.

[0034] As shown in Figure 1 and Figure 3 , the bottom surface of the powder supply box 3 is arc-shaped, the ends away from each other of the two printing tables 2 are both arranged in an inclined angle shape, and the width of the printing table 2 is the same as the width of the inner wall of the powder supply box 3.

[0035] When the two printing platforms 2 start to descend for turning over, one end of the bevel shape faces downward and inserts into the powder in the powder supply box 3. The bevel shape makes the two printing platforms 2 penetrate the powder layer and adhere to the bottom surface of the inner wall of the powder supply box 3 more easily. The bottom surface of the powder supply box 3 is arc-shaped. When the two printing platforms 2 reverse to turn over and reset, one end of the bevel shape rotates along the arc surface of the powder supply box 3. Since the width of the printing platform 2 is the same as the width of the inner wall of the powder supply box 3, the printing platform 2 can tightly adhere to the inner wall of the powder supply box 3 when it resets, avoiding leakage of the powder in the gap between the printing platform 2 and the inner wall of the powder supply box 3. The printing platform 2 can salvage more powder to meet the printing needs.

[0036] As shown in Figures 3 to 4 The feeding assembly includes two fixed shafts 15, which are respectively fixedly connected to the inner walls of the ends of the two printing platforms 2 close to each other. The two ends of the fixed shaft 15 are fixedly connected with inner sliding blocks 16. The outer walls of the inner sliding blocks 16 are slidingly connected with vertical sliding seats 17. The top of the workbench (1) is fixedly installed with a plurality of hydraulic cylinders (18). The vertical sliding seats (17) are respectively fixedly installed above the hydraulic cylinders (18). The output ends of the plurality of hydraulic cylinders (18) are respectively fixedly connected with the bottom surfaces of the inner sliding blocks (16). One side of the printing platform 2 is provided with a turning over assembly for driving the printing platform 2 to turn over.

[0037] When the two printing platforms 2 salvage powder, the two hydraulic cylinders 18 are started, and the output ends of the two hydraulic cylinders 18 drive the inner sliding blocks 16 to slide downward along the inner walls of the vertical sliding seats 17. At this time, the inner sliding blocks 16 drive the printing platforms 2 to move downward through the fixed shafts 15. In the moving process, the two printing platforms 2 are first turned over through the turning over assembly, and then inserted into the powder vertically. After the two printing platforms 2 reverse to reset, the powder is salvaged and processed through the shaking assembly. Then, the inner sliding blocks 16 are lifted upward by the hydraulic cylinders 18, so that the printing platforms 2 are lifted upward and reset.

[0038] As shown in Figures 3 to 5 The turning over assembly includes two gears 19, which are respectively fixedly connected to the outer walls of the two fixed shafts 15. The lower sides of the gears 19 are respectively provided with rack plates 20, and the teeth of the rack plates 20 can engage with the teeth of the gears 19. The number of the teeth of the rack plates 20 is one fourth of the number of the teeth of the gears 19. One side of the two rack plates 20 is provided with a magnetic assembly for driving the rack plates 20 to descend.

[0039] When the fixed shaft 15 drives the printing table 2 to start to descend, the gear 19 meshes with the teeth of the rack plate 20, so that the gear 19 rotates. Since the number of the teeth of the rack plate 20 is one fourth of the number of the teeth of the gear 19, after the gear 19 meshes with the rack plate 20, the gear 19 rotates 90 degrees, so that the two printing tables 2 rotate 90 degrees around the fixed shaft 15 as the center. After the printing table 2 rotates 90 degrees, the printing table 2 rotates from the horizontal state to the vertical state, so that the two inclined ends face directly downward. Under the drive of the hydraulic cylinder 18, the two printing tables 2 continue to descend and insert the inclined ends into the powder in the powder supply box 3. When the inclined ends of the two printing tables 2 are inserted into the powder supply box 3 and adhere to the inner wall bottom surface of the powder supply box 3, the rack plate 20 is lowered through the magnetic assembly, so that the two printing tables 2 are flipped and reset in the reverse direction, and the powder is salvaged.

[0040] As shown in Figure 5 and Figure 7 The magnetic assembly comprises a fixed sliding seat 22 fixedly installed on the top of the workbench 1. The inner wall of the fixed sliding seat 22 is slidably connected with a lifting sliding block 21. The lifting sliding block 21 is fixedly connected with one side of the rack plate 20. The lifting sliding block 21 is made of iron. The inner wall bottom of the fixed sliding seat 22 is provided with a magnet 24. The top of the lifting sliding block 21 is fixedly connected with a reset spring 23. One end of the reset spring 23 away from the lifting sliding block 21 is fixedly connected with the inner wall of the top of the fixed sliding seat 22.

[0041] When the printing table 2 is inserted into the powder in the powder supply box 3, the magnet 24 is energized, so that the iron lifting sliding block 21 slides downward along the inner wall of the fixed sliding seat 22 under the attraction of the magnet 24. The lifting sliding block 21 drives the rack plate 20 to slide downward. The rack plate 20 meshes with the teeth of the gear 19 again. Since the gear 19 is below the rack plate 20 at this time, the rack plate 20 drives the two gears 19 to rotate 90 degrees in the reverse direction, so that the printing table 2 rotates in the reverse direction around the fixed shaft 15 as the center. When the printing table 2 rotates, the inclined end slides along the arc-shaped inner wall of the powder supply box 3, so that the powder is completely salvaged on the upper surface of the printing table 2. After the rotation is completed, the two printing tables 2 are in the horizontal state. After the printing table 2 is shaken upward and reset through the shaking assembly, the magnet 24 is de-energized. The reset spring 23 resets the lifting sliding block 21 and the rack plate 20, so that the rack plate 20 is in meshing relationship with the gear 19 when the powder is fed subsequently.

[0042] As shown in Figures 8 to 9As shown, the shaking assembly comprises two connecting rods 26, which are fixedly connected to the outer walls of the two fixed shafts 15, respectively. The inner sliding blocks 16 are fixedly connected with connecting pieces 27 on one side. The connecting pieces 27 are fixedly connected with straight electric sliding rails 28 on one side. The straight electric sliding rails 28 are slidably connected with straight electric sliding blocks 29 on the inner walls. The straight electric sliding blocks 29 are fixedly connected with fixed plates 30 on the top. The fixed plates 30 are fixedly connected with arc-shaped electric sliding rails 31 on the top. The arc-shaped electric sliding rails 31 are slidably connected with arc-shaped electric sliding blocks 33 on the inner walls. The two arc-shaped electric sliding blocks 33 are fixedly connected with clamping pieces 32.

[0043] When the two printing tables 2 complete the reverse flipping and salvage the powder, the two printing tables 2 do not perform upward resetting and remain in place. The straight electric sliding blocks 29 are controlled to slide along the inner walls of the straight electric sliding rails 28, so that the clamping pieces 32 move and clamp the ends of the connecting rods 26 away from the fixed shafts 15. After the clamping pieces 32 wrap and clamp the outer walls of the connecting rods 26, the arc-shaped electric sliding blocks 33 are controlled to slide upward along the inner walls of the arc-shaped electric sliding rails 31, so that the clamping pieces 32 drive one end of the connecting rod 26 to tilt upward. The arc-shaped electric sliding blocks 33 slide downward along the inner walls of the arc-shaped electric sliding rails 31, and the connecting rod 26 returns to the original position. Since the connecting rod 26 and the printing table 2 share the fixed shaft 15 as the center point, when the inner sliding block 16 tilts and resets, the inclined angle end of the printing table 2 also tilts and resets. At this time, the printing table 2 can uniformly disperse most of the powder on both sides in the middle position of the two printing tables 2. Since the straight electric sliding rail 28 is connected with the inner sliding block 16, the clamping piece 32 can always be located on one side of the connecting rod 26. In the initial state, the clamping piece 32 does not contact the connecting rod 26, and does not affect the rotation of the connecting rod 26 when the fixed shaft 15 drives the printing table 2 to flip.

[0044] As shown in Figures 4 to 6 The top of the powder supply box 3 is fixedly connected with a limiting bin 25. The inner wall width of the limiting bin 25 is the same as the width of the printing table 2. The inner wall length of the limiting bin 25 is the same as the sum of the lengths of the two printing tables 2.

[0045] When the printing table 2 completes the reverse flipping and salvages the powder on the upper surface, the two printing tables 2 are located in the inner wall of the limiting bin 25. At this time, when the shaking assembly shakes the printing table 2, the powder on the surface of the printing table 2 is uniformly dispersed on the upper surface, and the powder does not fall from the side of the printing table 2 to the inside of the powder supply box 3.

[0046] As shown in Figures 1 to 2As shown, the powder laying assembly includes two fixed seats 7, both of which are fixedly installed on the bottom of the top plate frame 11, the inner walls of the two fixed seats 7 are rotatably connected to the threaded conveying rods 8, the outer walls of the threaded conveying rods 8 are threadedly connected to the internal thread blocks 6, the internal thread blocks 6 are slidingly connected to the inner walls of the fixed seats 7, the bottoms of the two internal thread blocks 6 are fixedly connected to the top of the anti-overflow plate 5, one end of the two threaded conveying rods 8 is fixedly connected to a transmission ring 9, and a transmission belt 10 is transmission-connected between the outer walls of the two transmission rings 9, and one end of one of the threaded conveying rods 8 is fixedly connected to a motor 14.

[0047] During operation: After the two printing tables 2 have completed loading and returned to their original positions, the motor 14 is started, and its output shaft will drive one of the threaded conveying rods 8 to rotate, and one of the threaded conveying rods 8 will drive the other threaded conveying rod 8 to rotate through the transmission relationship between the transmission ring 9 and the transmission belt 10. When the threaded conveying rod 8 rotates, it will drive the internal thread block 6 to slide along the inner wall of the fixed seat 7, so that the scraper 4 slides along the top of the printing table 2 to spread the powder evenly.

[0048] like Figures 1 to 2 As shown, anti-overflow plates 5 are symmetrically fixedly connected to both sides of the scraper 4, and ramp plates 34 are fixedly connected to the tops of both ends of the limiting bin 25.

[0049] During operation: through the anti-overflow plate 5, when the anti-overflow plate 5 spreads the powder, excess powder will not fall from both sides of the printing table 2. When the scraper 4 pushes the powder away from the upper surface of the printing table 2, the powder will fall back into the powder supply box 3 through the ramp plate 34.

[0050] like Figures 1 to 2 As shown, a plurality of electrically controlled telescopic rods 13 are fixedly connected to the bottom of the top plate frame 11 , and the electrically controlled telescopic rods 13 are respectively fixedly mounted on the top of the vertical slide 17 .

[0051] During operation: the height position of the scraper 4 can be adjusted by the electrically controlled telescopic rod 13, so that the paving height of the powder can be adjusted according to the height of the printed part, thereby improving the accuracy and surface quality of the printed part.

[0052] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A 3D printer powder spreading device, comprising a workbench, characterized in that: A powder supply box is fixedly installed on the top of the workbench, and two printing tables are symmetrically arranged above the powder supply box. One end of the two printing tables is attached to each other, and a top plate frame is provided above the two printing tables. A print head is provided on the bottom of the top plate frame, and a scraper is provided on one side of the print head. A powder spreading component for driving the scraper to move horizontally along the top of the printing table is provided above the scraper. A loading component for driving the printing table to descend and scoop up powder is provided on the side of the two printing tables. A shaking component for driving the printing table to tilt is also provided on the side of the two printing tables; The loading assembly includes two fixed shafts, which are respectively fixedly connected to the inner walls of the two printing tables at one end close to each other. Both ends of the fixed shafts are fixedly connected to inner sliders. Multiple hydraulic cylinders are fixedly installed on the top of the workbench, and vertical slides are respectively fixedly installed above the hydraulic cylinders. The output ends of the multiple hydraulic cylinders are respectively fixedly connected to the bottom surfaces of the inner sliders. A flip assembly is provided on one side of the printing table to drive it to flip. The flipping assembly includes two gears, which are respectively fixedly connected to the outer walls of the two fixed shafts. A rack plate is provided on the lower side of the gears, and the teeth of the rack plate can engage with the teeth of the gear. The number of teeth on the rack plate is one-fourth of the number of teeth on the gear. A magnetic assembly is provided on one side of the two rack plates to drive the rack plates to descend.

2. A 3D printer powder spreading device according to claim 1, characterized in that: The bottom surface of the powder supply box is in an arc shape, and the ends of the two printing tables that are away from each other are both set to be angled. The width of the printing tables is the same as the width of the inner wall of the powder supply box.

3. A 3D printer powder spreading device according to claim 2, characterized in that: The magnetic assembly includes a fixed slide, which is fixedly installed on the top of the workbench. The inner wall of the fixed slide is slidably connected to a lifting slider. The two sides of the lifting slider are respectively fixedly connected to one side of the rack plate. The lifting slider is made of iron material. A magnet is provided at the bottom of the inner wall of the fixed slide. The top of the lifting slider is fixedly connected to a reset spring. The end of the reset spring away from the lifting slider is fixedly connected to the inner wall surface of the top of the fixed slide.

4. A 3D printer powder spreading device according to claim 3, characterized in that: The shaking assembly includes two connecting long rods, which are respectively fixedly connected to the outer walls of the two fixed shafts. One side of the inner slider is fixedly connected with a connecting piece, one side of the connecting piece is fixedly connected with a straight-moving electric slide rail, the inner wall of the straight-moving electric slide rail is slidably connected with the straight-moving electric slider, the top of the straight-moving electric slider is fixedly connected with a fixed plate, the top of the fixed plate is symmetrically fixedly connected with an arc-shaped electric slide rail, the inner wall of the arc-shaped electric slide rail is slidably connected with the arc-shaped electric slider, and a clamping piece is fixedly connected between the two arc-shaped electric sliders.

5. A 3D printer powder spreading device according to claim 4, characterized in that: The top of the powder supply box is fixedly connected to a limit bin, the inner wall width of the limit bin is the same as the width of the printing table, and the inner wall length of the limit bin is the same as the sum of the lengths of the two printing tables.

6. A 3D printer powder spreading device according to claim 5, characterized in that: The powder spreading assembly includes two fixed seats, both of which are fixedly installed on the bottom of the top plate frame, the inner walls of the two fixed seats are rotatably connected to the threaded conveying rods, the outer walls of the threaded conveying rods are threadedly connected to the internal thread blocks, the internal thread blocks are slidingly connected to the inner walls of the fixed seats, the bottoms of the two internal thread blocks are fixedly connected to the top of the anti-overflow plate, one end of the two threaded conveying rods is fixedly connected to a transmission ring, and a transmission belt is transmission-connected between the outer walls of the two transmission rings, and one end of one of the threaded conveying rods is fixedly connected to a motor.

7. A 3D printer powder spreading device according to claim 6, characterized in that: Anti-overflow plates are symmetrically fixedly connected to both sides of the scraper, and ramp plates are fixedly connected to the tops of both ends of the limit bin.

8. A 3D printer powder spreading device according to claim 7, characterized in that: The bottom of the top plate frame is fixedly connected with a plurality of electric-controlled telescopic rods, and the electric-controlled telescopic rods are respectively fixedly installed on the top of the vertical slide.

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