Powder spreading device of 3D printer

Abstract

The invention 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 at the top of the workbench, two printing tables are symmetrically arranged above the powder supply box, one ends of the two printing tables are attached together, and a top plate frame is arranged above the two printing tables; a printing head is arranged on the bottom face of the top plate frame, a scraper is arranged on one side of the printing head, feeding assemblies used for driving the printing tables to descend for powder fishing are arranged on the sides of the two printing tables, and shaking assemblies used for driving the printing tables to tilt are further arranged on the sides of the two printing tables. The two printing tables automatically descend through the feeding assembly, powder is fished to the upper surfaces of the printing tables, the step of transferring redundant powder multiple times is avoided, the operation process is simplified, and meanwhile the problem that the powder is prone to being polluted or lost in the multiple times of transferring, and the printing quality is affected is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of 3D printers, and particularly relates to a powder spreading device for a 3D printer. Background Art

[0002] 3D printing is a kind of rapid prototyping technology, also known as additive manufacturing. It is a technology that constructs objects by layer-by-layer printing based on digital model files, using powdered metals or plastics and other bondable materials. 3D printing is usually realized by digital technology material printers. It is often used in the fields of mold manufacturing, industrial design, etc. to manufacture models, and then gradually used for the direct manufacturing of some products. There are already parts printed by this technology.

[0003] When the existing printers spread powder, the powder supply box is arranged above the printing table to feed powder. The powder is spread flat along the surface of the printing table by a scraper, and the excess powder is scraped off and falls into the overflow powder box for collection. Then, the excess powder in the overflow powder box needs to be re-introduced into the powder supply box. The back-and-forth operation is troublesome, and the re-introduction and export of the powder may cause the powder to be contaminated or lost during multiple transfers.

[0004] Therefore, the present invention provides a powder spreading device for a 3D printer. Summary of the Invention

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

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A powder spreading device for a 3D printer according to the present invention includes 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 ends of the two printing tables are mutually attached together. 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 powder spreading assembly for driving the scraper to horizontally move transversely above the printing table is arranged above the scraper. Loading assemblies for driving the printing tables to descend to scoop powder are arranged on the sides of the two printing tables. Jitter assemblies for driving the printing tables to tilt up are also arranged on the sides of the two printing tables.

[0007] Preferably, the bottom surface of the powder supply box is arc-shaped. One ends of the two printing tables away from each other are both arranged in a bevel shape. The width of the printing table is the same as the inner wall width of the powder supply box.

[0008] Preferably, the feeding component includes two fixed shafts, which are respectively fixedly connected to the inner walls of the two ends of the two printing platforms close to each other. Both ends of the fixed shafts are fixedly connected with inner sliders, and the outer walls of the inner sliders are slidably connected with vertical sliding seats. A plurality of hydraulic cylinders are fixedly installed on the top of the workbench, and the vertical sliding seats are respectively fixedly installed above the hydraulic cylinders. The output ends of the plurality of hydraulic cylinders are respectively fixedly connected to the bottom surfaces of the inner sliders. One side of the printing platform is provided with a flipping component for driving it to flip.

[0009] Preferably, the flipping component includes two gears, which are respectively fixedly connected to the outer walls of the two fixed shafts. Below the sides of the gears are provided with rack plates, and the teeth of the rack plates can mesh with the teeth of the gears. The number of teeth of the rack plates is one-fourth of the number of teeth of the gears. One side of the two rack plates is provided with a magnetic force component for driving the rack plates to descend.

[0010] Preferably, the magnetic force component includes a fixed sliding seat, which is fixedly installed on the top of the workbench. The inner wall of the fixed sliding seat is slidably connected with a lifting slider. Both 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 sliding seat. The top of the lifting slider is fixedly connected with a return spring, and the end of the return spring away from the lifting slider is fixedly connected to the inner wall surface of the top of the fixed sliding seat.

[0011] Preferably, the jitter component includes two connecting long rods, which are respectively fixedly connected to the outer walls of the two fixed shafts. One side of each inner slider is fixedly connected with a connecting piece, and one side of each connecting piece is fixedly connected with a straight electric slide rail. The inner walls of the straight electric slide rails are slidably connected with straight electric sliders. The tops of the straight electric sliders are respectively fixedly connected with fixing plates, and arc-shaped electric slide rails are symmetrically fixedly connected to the tops of the fixing plates. The inner walls of the arc-shaped electric slide rails are slidably connected with arc-shaped electric sliders. A clamping piece is fixedly connected between the two arc-shaped electric sliders.

[0012] Preferably, a limiting bin is fixedly connected to the top of the powder supply box. The inner width of the limiting bin is the same as the width of the printing platform, and the inner length of the limiting bin is the same as the sum of the lengths of the two printing platforms.

[0013] Preferably, the powder spreading component includes two fixed seats, which are both fixedly installed at 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 both threadedly connected with inner threaded blocks, and 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 to the top of the anti-overflow plate. One end of each of the two threaded conveying rods is fixedly connected with a transmission ring, and a transmission belt is connected between the outer walls of the two transmission rings. One end of one of the threaded conveying rods is fixedly connected with a motor.

[0014] Preferably, anti-overflow plates are symmetrically and fixedly connected to both sides of the scraper, and slope plates are fixedly connected to the tops of both ends of the limit bin.

[0015] Preferably, a plurality of electric control telescopic rods are fixedly connected to the bottom of the top plate frame, and the electric control telescopic rods are respectively fixedly installed on the tops of the vertical sliding seats.

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

[0017] 1. For the powder spreading device of a 3D printer described in the present invention, the powder supply box is arranged below the printing table. Through the feeding assembly, the two printing tables automatically descend to scoop up the powder onto their upper surfaces. Compared with the existing printers, when spreading powder, it is necessary to first spread the powder in the powder supply box on the printing table through a scraper, then scrape off the excess powder into the overflow powder box, and then re-introduce the powder in the overflow powder box into the powder supply box. When scraping off the excess powder in this device, the powder can directly fall into the interior of the powder supply box for recycling, avoiding the steps of multiple transfers of the excess powder, simplifying the operation process, and also avoiding the problem that the powder is easily contaminated or lost during multiple transfers, affecting the printing quality.

[0018] 2. For the powder spreading device of a 3D printer described in the present invention, through the arranged vibration assembly, part of the powder is dispersed along the middle position of the printing table, and the powder is evenly distributed above the printing table. On the basis of the uniform distribution of the powder, the scraper can move more smoothly and accurately above the printing table to spread the powder evenly. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 1 is the overall three-dimensional view of the present invention;

[0021] Figure 2 is the structural schematic diagram of the scraper in the present invention;

[0022] Figure 3 is the structural schematic diagram of the workbench in the present invention;

[0023] Figure 4 is the structural schematic diagram of the vertical sliding seat in the present invention;

[0024] Figure 5 is the structural schematic diagram of the printing table in the present invention;

[0025] Figure 6 is the structural schematic diagram of the powder supply box in the present invention;

[0026] Figure 7 is the structural schematic diagram of the magnet in the present invention;

[0027] Figure 8It is a schematic structural diagram of the straight electric slide rail in the present invention;

[0028] Figure 9 It is a schematic structural diagram of the connecting long rod in the present invention.

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

[0030] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0031] As Figures 1 to 9 shown, the present invention provides a technical solution: a powder spreading device for a 3D printer, including a workbench 1, a powder supply box 3 is fixedly installed on the top of the workbench 1, two printing tables 2 are symmetrically arranged above the powder supply box 3, one ends of the two printing tables 2 are mutually attached together, a top plate frame 11 is arranged above the two printing tables 2, a print head 12 is arranged on the bottom surface of the top plate frame 11, a doctor blade 4 is arranged on one side of the print head 12, and a powder spreading assembly for driving the doctor blade 4 to horizontally move transversely above the printing table 2 is arranged above the doctor blade 4. Feeding assemblies for driving the printing tables 2 to descend to scoop powder are arranged on the sides of the two printing tables 2, and a shaking assembly for driving the printing tables 2 to tilt is also arranged on the sides of the two printing tables 2.

[0032] During operation: Add the powder of the required category of the 3D printer into the interior of the powder supply box 3. When the upper surface of the printing platform 2 needs to be filled with powder, start the feeding component. The feeding component first drives the two printing platforms 2 to descend. When starting to descend, the two printing platforms 2 will flip. When the two printing platforms 2 flip, they will gradually change from the horizontal state to the vertical state. Then when the two printing platforms 2 continue to descend, they will gradually enter the interior of the powder supply box 3 and insert into the powder inside the powder supply box 3. When the bottom of the printing platform 2 is completely attached to the bottom of the powder supply box 3, the two printing platforms 2 will flip back in the reverse direction to the horizontal state, automatically fishing the powder inside the powder supply box 3 onto the upper surfaces of the two printing platforms 2. After fishing in this way, most of the powder will be concentrated on the side of the two printing platforms 2 that are away from each other. At this time, through the shaking component, the side of the two printing platforms 2 that are away from each other is lifted upward, so as to achieve shaking. During the shaking process, some powder will converge from the side of the two printing platforms 2 that are away from each other to the middle position of the two printing platforms 2, so that the powder is evenly distributed above the two printing platforms 2. After completion, the printing platform 2 is lifted and reset. At this time, the powder spreading component drives the scraper 4 to move horizontally above the printing platform 2. During the movement, the powder is evenly spread out, and the spread powder is used for 3D printing through the print head 12;

[0033] Through the above embodiments, the powder supply box 3 is arranged below the printing platform 2. Through the feeding component, the two printing platforms 2 are automatically lowered, and the powder is fished onto their upper surfaces. Compared with the existing printers, when spreading the powder, it is necessary to first spread the powder in the powder supply box on the printing platform 2 through the scraper 4, and then scrape off the excess powder into the overflow powder box, and then re-introduce the powder in the overflow powder box into the powder supply box. When the device scrapes off the excess powder, the powder can directly fall into the interior of the powder supply box 3 for recycling, avoiding the steps of transferring the excess powder multiple times, simplifying the operation process, and at the same time avoiding the problem that the powder is easily contaminated or lost during multiple transfers, affecting the printing quality; and through the arranged shaking component, part of the powder is dispersed along the middle position of the printing platform 2, and the powder is evenly distributed above the printing platform 2. On the basis of the uniform distribution of the powder, the scraper 4 can move more smoothly and accurately above the printing platform 2 to evenly spread the powder.

[0034] As Figure 1 and Figure 3 shown, the bottom surface of the powder supply box 3 is in an arc shape, and the ends of the two printing platforms 2 that are away from each other are both in an oblique angle shape. The width of the printing platform 2 is the same as the inner wall width of the powder supply box 3.

[0035] During operation: When the two printing platforms 2 start to descend and flip, the end with an inclined angle faces downward and inserts into the powder in the powder supply box 3. The inclined angle is set so that the two printing platforms 2 can more easily penetrate the powder layer and fit against the inner wall bottom surface of the powder supply box 3. The bottom surface of the powder supply box 3 is arc-shaped. When the two printing platforms 2 reverse and flip back to their original positions, the end with the inclined angle rotates along the arc surface of the powder supply box 3. Since the width of the printing platform 2 is the same as the inner wall width of the powder supply box 3, the printing platform 2 can closely fit against the inner wall of the powder supply box 3 when flipping back to its original position, preventing powder from leaking through the gap between the printing platform 2 and the inner wall of the powder supply box 3. The printing platform 2 can pick up more powder to meet the printing needs.

[0036] As Figures 3 to 4 shown in the figure, the feeding assembly includes two fixed shafts 15. The two fixed shafts 15 are respectively fixedly connected to the inner walls of the ends of the two printing platforms 2 that are close to each other. Both ends of the fixed shaft 15 are fixedly connected with inner sliders 16. The outer walls of the inner sliders 16 are slidably connected with vertical sliding seats 17. A plurality of hydraulic cylinders 18 are fixedly installed on the top of the workbench (1). 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 to the bottom surfaces of the inner sliders (16). A flipping assembly for driving the printing platform 2 to flip is arranged on one side of the printing platform 2.

[0037] During operation: When the two printing platforms 2 are picking up powder, start the two hydraulic cylinders 18. Their output ends will drive the inner sliders 16 to slide downward along the inner walls of the vertical sliding seats 17. At this time, the inner sliders 16 will drive the printing platforms 2 to move downward through the fixed shafts 15. During the movement, through the flipping assembly, the two printing platforms 2 first flip, and then vertically move downward and insert into the powder. After the two printing platforms 2 reverse and flip back to their original positions, pick up the powder and process it through the jittering assembly, and then drive the inner sliders 16 to move upward through the hydraulic cylinders 18, so that the printing platforms 2 move upward and return to their original positions.

[0038] As Figures 3 to 5 shown in the figure, the flipping assembly includes two gears 19. The two gears 19 are respectively fixedly connected to the outer walls of the two fixed shafts 15. Below the sides of the gears 19 are provided with rack plates 20, and the teeth of the rack plates 20 can mesh with the teeth of the gears 19. The number of teeth of the rack plates 20 is one-fourth of the number of teeth of the gears 19. On one side of the two rack plates 20, there is a magnetic force assembly for driving the rack plates 20 to descend.

[0039] During operation: When the fixed shaft 15 drives the printing table 2 to start descending, the gear 19 will engage with the teeth of the rack plate 20, causing the gear 19 to rotate. Since the number of teeth of the rack plate 20 is one-fourth of the number of teeth of the gear 19, after the gear 19 and the rack plate 20 are fully engaged, the gear 19 just rotates 90 degrees, causing the two printing tables 2 to rotate 90 degrees around the fixed shaft 15 as the pivot point. After the printing table 2 rotates 90 degrees, it will rotate from the horizontal state to the vertical state, so that the two bevel ends just face directly downward. Driven by the hydraulic cylinder 18, the two printing tables 2 continue to descend, and the bevel ends are inserted into the powder in the powder supply box 3. When the bevel ends of the two printing tables 2 are inserted into the interior of the powder supply box 3 and fit with the inner wall bottom surface of the powder supply box 3, the rack plate 20 is caused to descend by the magnetic force assembly. When the rack plate 20 descends, it will cause the two printing tables 2 to reverse and flip back to retrieve the powder.

[0040] As Figure 5 and Figure 7 shown, the magnetic force assembly includes a fixed sliding seat 22, which is fixedly installed on the top of the workbench 1. The inner wall of the fixed sliding seat 22 is slidably connected with a lifting slider 21. The two sides of the lifting slider 21 are respectively fixedly connected with one side of the rack plate 20. The lifting slider 21 is made of iron material. A magnet 24 is provided at the bottom of the inner wall of the fixed sliding seat 22. The top of the lifting slider 21 is fixedly connected with a return spring 23. The end of the return spring 23 away from the lifting slider 21 is fixedly connected with the inner wall surface of the top of the fixed sliding seat 22.

[0041] During operation: When the printing table 2 is inserted into the powder in the powder supply box 3, the magnet 24 is energized. The magnet 24 generates an adsorption force, causing the iron material lifting slider 21 to slide downward along the inner wall of the fixed sliding seat 22. The lifting slider 21 will drive the rack plate 20 to slide downward. When the rack plate 20 slides downward, it will engage with the teeth of the gear 19 again. Since the gear 19 is located below the rack plate 20 at this time, when the rack plate 20 moves downward, it will drive the two gears 19 to rotate 90 degrees in the reverse direction, causing the printing table 2 to rotate in the reverse direction around the fixed axis 15. When the printing table 2 rotates, the bevel ends will slide along the arc-shaped inner wall of the powder supply box 3, retrieving all the powder onto the upper surface of the printing table 2. After the rotation is completed, the two printing tables 2 just return to the horizontal state. After the printing table 2 is lifted and reset by the shaking assembly, the magnet 24 is powered off, and the return spring 23 will cause the lifting slider 21 and the rack plate 20 to reset, facilitating the engagement between the rack plate 20 and the gear 19 during subsequent feeding.

[0042] As Figures 8 to 9As shown in the figure, the jitter component includes two connecting long rods 26. The two connecting long rods 26 are respectively fixedly connected to the outer walls of the two fixed shafts 15. A connecting piece 27 is fixedly connected to one side of each inner slider 16. A linear electric slide rail 28 is fixedly connected to one side of each connecting piece 27. A linear electric slider 29 is slidably connected to the inner wall of each linear electric slide rail 28. A fixing plate 30 is fixedly connected to the top of each linear electric slider 29. An arc-shaped electric slide rail 31 is symmetrically fixedly connected to the top of the fixing plate 30. An arc-shaped electric slider 33 is slidably connected to the inner wall of each arc-shaped electric slide rail 31. A clamping piece 32 is fixedly connected between the two arc-shaped electric sliders 33.

[0043] During operation: When the two printing platforms 2 complete the reverse flipping to salvage the powder, the two printing platforms 2 do not rise and reset but remain in place. By controlling the linear electric slider 29 to slide along the inner wall of the linear electric slide rail 28, the clamping piece 32 moves to clamp the end of the connecting long rod 26 far from the fixed shaft 15. After the outer wall of the connecting long rod 26 is wrapped and clamped by the inner wall of the clamping piece 32, by controlling the arc-shaped electric slider 33 to slide upward along the inner wall of the arc-shaped electric slide rail 31, the clamping piece 32 drives one end of the connecting long rod 26 to tilt upward, while the arc-shaped electric slider 33 slides downward along the inner wall of the arc-shaped electric slide rail 31, and the connecting long rod 26 returns to its original position. Since the connecting long rod 26 and the printing platform 2 share the fixed shaft 15 as the pivot point, when the inner slider 16 tilts and resets, the inclined end of the printing platform 2 will also tilt and reset. At this time, the printing platform 2 can evenly disperse most of the powder on both sides in the middle position between the two printing platforms 2. Since the linear electric slide rail 28 is connected to the inner slider 16, the clamping piece 32 can always be located on one side of the connecting long rod 26, and the clamping piece 32 does not contact the connecting long rod 26 in the initial state, which does not affect the rotation of the connecting long rod 26 driven by the fixed shaft 15 when driving the printing platform 2 to flip.

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

[0045] During operation: Through the arranged limiting bin 25, when the printing platform 2 completes the reverse flipping and salvages the powder on its upper surface, the two printing platforms 2 are both located inside the inner wall of the limiting bin 25. At this time, when the jitter component makes the printing platform 2 jitter, the powder on the surface of the printing platform 2 will be evenly dispersed on its upper surface, and the powder will not fall back into the powder supply box 3 from the side of the printing platform 2.

[0046] As Figures 1 to 2As shown in the figure, the powder spreading assembly includes two fixed seats 7, both of which are fixedly installed at the bottom of the top plate frame 11. The inner walls of the two fixed seats 7 are rotatably connected with screw conveying rods 8. The outer walls of the screw conveying rods 8 are threadedly connected with internal thread blocks 6. The internal thread blocks 6 are slidably connected with 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 overflow prevention plate 5. One end of each of the two screw conveying rods 8 is fixedly connected with a transmission ring 9, and a transmission belt 10 is connected between the outer walls of the two transmission rings 9. One end of one of the screw conveying rods 8 is fixedly connected with a motor 14.

[0047] During operation: When the two printing platforms 2 are loaded and restored to their original positions, the motor 14 is started. Its output shaft will drive one of the screw conveying rods 8 to rotate, and one of the screw conveying rods 8 drives the other screw conveying rod 8 to rotate through the transmission relationship between the transmission ring 9 and the transmission belt 10. When the screw 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 above the printing platform 2 to evenly spread the powder material.

[0048] As Figures 1 to 2 shown, both sides of the scraper 4 are symmetrically and fixedly connected with overflow prevention plates 5, and both ends of the top of the limit bin 25 are fixedly connected with ramp plates 34.

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

[0050] As Figures 1 to 2 shown, the bottom of the top plate frame 11 is fixedly connected with a plurality of electric control telescopic rods 13, and the electric control telescopic rods 13 are respectively fixedly installed at the top of the vertical sliding seats 17.

[0051] During operation: Through the provided electric control telescopic rods 13, the height position of the scraper 4 can be adjusted, so that the spreading height of the powder material can be adjusted according to the height of the printed part, thereby improving the accuracy and surface quality of the printed part.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A powder spreading device for a 3D printer, 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 ends of the two printing tables are fitted together, and a top plate frame is arranged above the two printing tables. A print head is arranged on the bottom of the top plate frame, and a scraper is arranged 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 arranged above the scraper, and loading components for driving the printing tables to descend to scoop powder are arranged on the sides of the two printing tables. A shaking component for driving the printing tables to tilt is also arranged on the sides of the two printing tables.

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 in an oblique shape, and the width of the printing table 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 loading assembly includes two fixed shafts, which are respectively fixedly connected to the inner walls of one end of the two printing tables that are close to each other. Both ends of the fixed shafts are fixedly connected to inner sliding blocks. A plurality of hydraulic cylinders are fixedly installed on the top of the workbench, and the vertical slides are respectively fixedly installed above the hydraulic cylinders. The output ends of the plurality of hydraulic cylinders are respectively fixedly connected to the bottom surfaces of the inner sliding blocks. A flipping assembly for driving the printing table to flip is provided on one side of the printing table.

4. A 3D printer powder spreading device according to claim 3, characterized in that: The flipping assembly includes two gears, which are respectively fixedly connected to the outer walls of the two fixed shafts. Rack plates are arranged on the lower sides of the gears, and the teeth of the rack plates can mesh with the teeth of the gears. The number of teeth of the rack plates is one-fourth of the number of teeth of the gears. A magnetic assembly is arranged on one side of the two rack plates to drive the rack plates to descend.

5. A 3D printer powder spreading device according to claim 4, 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 with a lifting slide. The two sides of the lifting slide are respectively fixedly connected to one side of the rack plate. The lifting slide 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 slide is fixedly connected with a return spring. The end of the return spring away from the lifting slide is fixedly connected to the inner wall surface of the top of the fixed slide.

6. A 3D printer powder spreading device according to claim 5, 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 slide rail, and a clamping piece is fixedly connected between the two arc-shaped electric slides.

7. A 3D printer powder spreading device according to claim 6, characterized in that: The top of the powder supply box is fixedly connected to a limiting bin, the inner wall width of the limiting bin is the same as the width of the printing table, and the inner wall length of the limiting bin is the same as the sum of the lengths of the two printing tables.

8. A 3D printer powder spreading device according to claim 7, characterized in that: The powder spreading assembly includes two fixed seats, both of which are fixedly installed at 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 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 ends of the two threaded conveying rods are fixedly connected with transmission rings, 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.

9. A 3D printer powder spreading device according to claim 8, characterized in that: Anti-overflow plates are symmetrically fixedly connected on both sides of the scraper, and ramp plates are fixedly connected on the tops of both ends of the limiting bin.

10. A 3D printer powder spreading device according to claim 9, 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 seat.

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