CN212498212U

CN212498212U - A novel scraper for 3D prints

Info

Publication number: CN212498212U
Application number: CN202021861837.2U
Authority: CN
Inventors: 黄石伟; 陈�光; 顾荣军
Original assignee: Jiangsu Qiandu Zhizao Hi Tech Co Ltd
Current assignee: Jiangsu Qiandu Zhizao Hi Tech Co Ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-02-09
Anticipated expiration: 2030-08-31

Abstract

The utility model provides a novel scraper for 3D prints, include: the knife body and the cutting edge are positioned at the bottom of the knife body; the cutting edge includes: a nose portion, a front facet and a rear facet; the nose portion and the front blade face and/or the rear blade face form a pressure relief notch. Through the matched design of the cutter point part, the front blade face and the rear blade face and the formed pressure relief notch, the problem that the forming precision is influenced due to low spreading uniformity in the 3D printing process is solved, the service life of the cutter is prolonged to a certain extent due to the optimized design of the cutting edge, and the production cost is reduced; the material box is more suitable for rotating the material box; the slurry can adapt to slurries with different viscosities; and the pressure release breach makes the scraper have intensity that can not influence the scraper when good heat dispersion can with the degree of consistency of scraping the material, scrapes material evenly, uniform thickness, and the surface is level and smooth no burr.

Description

A novel scraper for 3D prints

Technical Field

The utility model belongs to the technical field of 3D printing apparatus, especially, relate to a novel scraper for 3D prints.

Background

The additive manufacturing technology has great application potential in the field of preparation of high-performance complex-structure ceramic parts, compared with mainstream additive manufacturing technologies such as organic matters and metals, ceramics have widely applied materials, the research and application of a blade used in a scraping mechanism in a 3D printer are less mature due to the constraint of inherent characteristics of the materials, and the performance of the scraper determines the quality of a formed part to a certain extent. The existing slurry scraper is often accompanied with the problems of uneven material drawing and scraping when scraping materials, the problems of unequal thickness and burrs are caused due to poor heat dissipation, and finally the forming effect of a formed workpiece is poor and the precision is low. In addition, the existing scraper cannot adapt to slurry with different viscosities.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a novel scraper for 3D prints. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

The utility model adopts the following technical scheme:

in some optional embodiments, there is provided a novel doctor blade for 3D printing, comprising: the knife body and the cutting edge are positioned at the bottom of the knife body; the cutting edge includes: a nose portion, a front facet and a rear facet; the nose portion and the front blade face and/or the rear blade face form a pressure relief notch.

In some alternative embodiments, said nose portion and said back facet form said relief notch; the trailing edge face comprises: tilting the rear plane; an included angle between the inclined rear plane and the processing surface is 10-12 degrees; the included angle between the front edge face and the machining surface is 35-40 degrees.

In some alternative embodiments, the nose portion and the front facet form the relief notch, and the nose portion is a plane; the front facet includes: the first front plane and the second front plane are in transition connection through an arc, and an included angle between the first front plane and the second front plane is 90 degrees.

In some alternative embodiments, said nose portion and said leading edge facet form said relief notch; the front facet includes: a vertical surface and a quarter-circle surface.

In some alternative embodiments, said nose portion and said leading and trailing edge faces each form said relief notch; the front facet includes: inclining the front plane and the front cambered surface; the trailing edge face comprises: and a rear arc surface.

In some optional embodiments, the nose portion, the front edge face and the rear edge face each form the relief notch, and the nose portion is a semicircular arc-shaped face; the front facet includes: vertical surface and connection cambered surface.

In some optional embodiments, the nose portion, the front edge face and the rear edge face each form the relief notch, and the nose portion is an arc-shaped face; the front facet includes: a bevel and a horizontal plane.

In some alternative embodiments, said nose portion and said leading and trailing edge surfaces each define said relief notch, said nose portion being a flat surface; the front facet includes: the device comprises a first front inclined plane and a second front inclined plane, wherein the first front inclined plane and the second front inclined plane are in transition connection through a smooth cambered surface; the trailing edge face comprises: a rear inclined plane and a rear cambered surface.

The utility model discloses the beneficial effect who brings: the utility model solves the problem that the forming precision is affected because of low spreading uniformity in the 3D printing process through the matching design of the cutter point part, the front cutting edge surface and the rear cutting edge surface and the formed pressure relief notch, and increases the service life of the cutter to a certain extent and reduces the production cost due to the optimized design of the cutting edge; the material box is more suitable for rotating the material box; the slurry can adapt to slurries with different viscosities; and the pressure release breach makes the scraper have intensity that can not influence the scraper when good heat dispersion can with the degree of consistency of scraping the material, scrapes material evenly, uniform thickness, and the surface is level and smooth no burr.

Drawings

FIG. 1 is a schematic structural view of one embodiment of a doctor blade of the present invention;

fig. 2 is a schematic structural view of another embodiment of the scraper blade of the present invention;

fig. 3 is a schematic structural view of another embodiment of the scraper blade of the present invention;

fig. 4 is a schematic structural view of another embodiment of the scraper blade of the present invention;

fig. 5 is a schematic structural view of another embodiment of the scraper blade of the present invention;

fig. 6 is a schematic structural view of another embodiment of the scraper of the present invention;

fig. 7 is a schematic structural view of another embodiment of the doctor blade of the present invention;

fig. 8 is a structural diagram of a 3D printer to which the present invention is applied;

FIG. 9 is a schematic view of a projection system;

FIG. 10 is a schematic structural view of the cartridge;

FIG. 11 is a schematic view of the explosive structure of the cartridge;

fig. 12 is a schematic view of the inner case and the press ring according to the present invention;

figure 13 is a schematic view of the support ring structure of the present invention;

FIG. 14 is a schematic view of the outer case of the present invention engaged with the press ring;

FIG. 15 is a schematic view of the cartridge adaptor of the present invention;

figure 16 is a bottom schematic view of the magazine of the present invention;

fig. 17 is a schematic structural view of the scraping mechanism of the present invention;

fig. 18 is an exploded view of the scraping mechanism of the present invention;

FIG. 19 is a schematic view of the installation of the cantilever, the cantilever mounting support and the umbrella bolt of the present invention;

fig. 20 is a schematic view of the main structure of the present invention.

Detailed Description

The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others.

In some illustrative embodiments, a new doctor blade for 3D printing is provided, the doctor blade 406 comprising: blade 600 and the blade 700 that is located the blade 600 bottom, blade 600 and blade 700 are integrated into one piece structure. The cutting edge 700 includes: nose 701, front facet 702, and back facet 703, nose 701 forming a relief notch 800 with front facet 702 and/or back facet 703. Leading facet 702 and trailing facet 703 flank tip portion 701. The cooperation of sword point portion 701, front flank 702 and back flank 703 is used to and the pressure release breach that forms, can guarantee that the scraper edge makes the scraper possess certain intensity and certain heat dissipation space when sharp, and adaptability is better.

As shown in fig. 1, nose portion 701 and back facet 703 form relief notch 800. The rear facet 703 includes: the rear plane 704 is tilted. The point 701 is in line contact with the work surface 900, i.e., the contact area is one line. The size of the front angle alpha of the wedge-shaped scraper influences the slurry deformation, the scraping resistance and the heat dissipation of a cutter head in the scraping process, and simultaneously influences the surface roughness of a printed product and the strength and the service life of a cutter, so that the optimal effect is achieved when the included angle between the front edge surface 702 and the processed surface 900 is 35-40 degrees. The magnitude of the relief angle β will affect the friction between the back facet of the tool and the machined surface, so that the angle between the inclined back plane 704 and the machined surface 900 is chosen to be 10-12 ° for best results.

As shown in fig. 2, the nose portion 701 and the front facet 702 form a relief notch 800, and the nose portion 701 is a plane, so that the nose portion 701 and the processing surface 900 are in surface contact, i.e., the contact area is a plane, which is the nose portion 701 itself. The front facet 702 includes: the cutting edge comprises a first front plane 705 and a second front plane 706, wherein the first front plane 705 and the second front plane 706 are in transitional connection through an arc 707, and the first front plane 705, the arc 707 and the second front plane 706 jointly form a front edge surface 702, so that the cutting edge is in a shoe shape. The first front plane 705 makes a 90 deg. angle with the second front plane 706. In the blade coating process of the shoe-shaped scraper, the resistance of the slurry before the scraper is small, and the area of the blade tip part 701 can be adjusted according to the laying layers with different roughness, namely the contact area of the blade tip part 701 and the processed surface 900 is adjusted, and the larger the contact area is, the higher the paper roughness is, and the better adaptability is realized.

As shown in fig. 3, nose 701 and front facet 702 form relief notch 800. The nose portion 701 is a plane, and the nose portion 701 is in surface contact with the machining surface 900, that is, the contact area is a plane, which is the nose portion 701 itself. The front facet 702 includes: a vertical surface 708 and a quarter-circle surface 709. Vertical face 708 is joined smoothly with quarter-circle face 709 to form leading edge face 702. In the blade coating process of the cutting edge with the quarter circular arc, the quarter circular arc surface 709 reduces the influence of the angle between the scraper and the processing surface 900 on the layer laying effect, the blade coating resistance is small, the contact area is small, and the blade coating is not easy to wear. The scraper has a certain thickness, so that the scraper is guaranteed not to deform in the horizontal direction and is also guaranteed to have long service life.

As shown in fig. 4, nose 701 forms a relief notch 800 with front facet 702 and back facet 703. The point 701 is in line contact with the work surface 900, i.e., the contact area is one line. The front facet 702 includes: the inclined front plane 710 and the front arc surface 711, and the inclined front plane 710 and the front arc surface 711 are smoothly transited and connected to form the front edge surface 702. The rear facet 703 includes: a rear arc surface 712. The front and rear

curved surfaces

711 and 712 make the edge hook-shaped and form a tip b 1. the hook-shaped blade is slightly thicker in layer when blade coating, which is directly related to the bending angle of the tip b 1. When the angle of the scraper and the paste is in a hook arc shape, the paste is mainly subjected to forward and downward forces, and the downward force in the ceramic paste scraping in the 3D printing process can make the paste surface denser.

As shown in fig. 5, the nose portion 701, the front blade surface 702 and the rear blade surface 703 both form a relief notch 800, and the nose portion 701 is a semicircular arc surface and is in line contact with the processing surface 900, that is, the contact area is a line, so that the cutting edge is circular. The front facet 702 includes: vertical face 713 and connecting arcs 714. The front end of the blade of the circular scraper is an inclined plane with an angle alpha, and the inclined plane is connected with the vertical plane 713 through a connecting arc 714. The knife edge part 701 is a semicircular arc surface, the diameter of the circle where the semicircular arc is located is d, and d is the width of the knife edge. In the blade coating process, the front end inclined plane angle alpha and the cutting edge width d of the round scraper play a main role in the performance of the scraper, and influence the deformation of slurry, the heat dissipation of a cutter head, the strength of a cutter and the service life in the blade coating process. The circular scraper reduces the influence of the angle between the scraper and the processing surface 900 on the layering effect during use, and simultaneously has smaller scraping resistance.

As shown in fig. 6, nose 701 forms a relief notch 800 with front facet 702 and back facet 703. The cutting edge 701 is a circular arc surface and is in line contact with the machining surface 900, that is, the contact area is a line. The front facet 702 includes: bevel 715 and horizontal 716, where bevel 715 and horizontal 716 join to form front facet 702, thereby making the edge comma-shaped. The comma-type scraper is provided with a cutting edge at the front end of the blade body, and the shape of the comma-type scraper is similar to that of a comma. In the blade coating process, the front side cambered surface 701a of the cutter point part 701 is used as the front end of the cutter edge and is a region where slurry is extruded, after the slurry passes through the cutting edge, the rear side cambered surface 701b of the cutter point part 701 is used as the rear end of the cutter edge, the pressure of the rear end of the cutter edge on the slurry is reduced, the slurry rebounds and cannot contact a comma scraper, and viscous traces are effectively eliminated. The comma-type scraper has a wide range of requirements on the viscosity of slurry used in 3D printing, and has uniform layering and a smooth molding surface.

As shown in fig. 7, nose 701 forms a relief notch 800 with front facet 702 and back facet 703. The nose portion 701 is a plane, and the nose portion 701 is in surface contact with the machining surface 900, that is, the contact area is a plane, which is the nose portion 701 itself. The front facet 702 includes: the cutting tool comprises a first front inclined surface 717 and a second front inclined surface 718, wherein the first front inclined surface 717 and the second front inclined surface 718 are in transition connection through a smooth arc surface 719, and the first front inclined surface 717, the smooth arc surface 719 and the second front inclined surface 718 are sequentially connected to form a front blade surface 702. The rear facet 703 includes: a rear inclined plane 720 and a transition rear arc surface 721, wherein the rear inclined plane 720 is connected with the transition rear arc surface 721 to form a rear edge surface 703. A first front inclined surface 717 having an angle α at the tip end of the blade, a rear inclined surface 720 having an angle γ with the machining surface 900, and the bottom surface of the cutting tip 701 being a flat surface. In the scraping process of the scraper, due to the front end sharp-angled structure, the resistance of the slurry before the scraper is small. The size of the back angle gamma will affect the friction between the back tool face of the cutter and the processing surface 900, the friction between the bottom surface of the cutting edge and the blade coating surface increases along with the increase of the back angle gamma, and the size of the back angle gamma is adjusted, so that the scraper has certain strength and heat dissipation area while having smaller friction force.

The utility model discloses a scraper 406 is applied to the 3D printer, as shown in FIG. 8, the 3D printer includes: projection system 100, print platform 200, magazine 300, scraping mechanism 400, main structure 500.

A projection system 100 for generating a beam of ultraviolet light to cure the slurry. As shown in fig. 9, the projection system 100 includes: the digital projector 101 is arranged below the optical glass in the material box 300 through the optical machine support 102, the lens of the digital projector 101 faces upwards and projects on the optical glass from bottom to top, and the slurry on the optical glass is irradiated and cured. The utility model discloses digital projector 101 adopts the DLP projector, and the screen flickers the single image on every layer on whole print platform 200, because the DLP projector is digital screen, and every layer comprises square pixel, and printing resolution is higher.

The material box 300 is used for containing the slurry required by solidification. As shown in fig. 8, 10, and 11, the magazine 300 includes: compression ring 301, outer casing 304, inner casing 303, support ring 308, cartridge adaptor 305, cross roller bearing 306, stepper motor 307. The inner box 303 forms a printing cavity inside, that is, the inner cavity of the inner box 303 is the printing cavity.

As shown in fig. 12, the top end of the inner box 303 is provided with a sunken table 309, the lower surface of the pressing ring 301 is provided with a step inner ring 310 adapted to the sunken table 309, when the pressing ring 301 is buckled at the top of the inner box 303, the step inner ring 310 is embedded in the sunken table 309, and the step inner ring 310 and the sunken table 309 of the inner box are in surface contact, so that the overall structure is stable and the precision is higher. The pressing ring 301 is evenly provided with a plurality of epitaxial protruding pieces 311 all around, and outer box 304 sets up the elastic buckle 302 that is used for compressing tightly pressing ring 301 in the position department that corresponds epitaxial protruding piece 311, and the end of withholding of elastic buckle 302 pushes down epitaxial protruding piece 311 to realize that elastic buckle 302 will interior box 303 lock in outer box 304 through pressing ring 301. When the magazine needs to be replaced, only the elastic buckle 302 needs to be opened, the inner box 303 is taken out, the disassembly is convenient, the structural design of the pressing ring 301, the elastic buckle 302 and the inner box 303 can eliminate the mechanical error of the inner box 303 caused by vibration and frequent disassembly in the working process, and therefore the product forming precision and the service life are improved.

The support ring 308 is mounted at the bottom of the inner box 303 by screws, and the optical glass 312 is disposed on the support ring 308, specifically, the support ring 308 and the optical glass 312 are integrated by bonding. The support ring 308 is provided with optical glass 312 as a molding plane, is connected with the inner box 2 by screws and then is embedded into the outer box 4, and the bottom of the support ring is used for transmitting ultraviolet light to cure and mold materials. The inner box 2 for containing materials and the bottom of the material box can be detached at any time, so that the residual materials can be cleaned conveniently.

As shown in figure 13, the bottom of the support ring 308 is provided with support bosses 313 which ensure that the precision of the lower surface of the cartridge is not worn after removal.

As shown in fig. 14, the epitaxial protrusion sheet 311 is formed with a hollow groove 314. The elastic catch 302 includes: the buckle main body 315 is provided with a resilient pressing piece 316 at the top end of the buckle main body 315, and when the elastic buckle 302 presses the pressing ring 301, the resilient pressing piece 316 is embedded in the hollow-out groove 314. The hollow-out groove 314 is designed on the pressing ring 301, the elastic buckle 302 can be clamped on the pressing ring, the inner ring 310 with the step of the inner ring of the pressing ring 301 is in surface contact with the inner box 303, the inner box 303 can be pressed, pretightening force is applied to the inner box 303 through the elastic buckle 302 and the pressing ring 301, the purpose of pressing the inner box 303 is achieved, and meanwhile the pressing ring 301 is convenient to detach. The overall structure is simple and stable, and the convenience in disassembly is guaranteed, and meanwhile, the material box 300 still has high precision after being disassembled frequently.

The outer box 304 is mounted on the cartridge adaptor 305 by 8 long screws, as shown in fig. 15, the cartridge adaptor 305 is provided with bolt holes 317, the cartridge adaptor 305 is fixed on the inner ring of the cross roller bearing 306 by bolts, and the outer ring of the cross roller bearing 306 is arranged on the main structure 500.

As shown in fig. 16, the magazine 300 further includes: a first gear 318, a second gear 319. A first gear 318 is fixed to an inner ring of the cross roller bearing 306 by bolts, and a second gear 319 is provided on a drive shaft of the stepping motor 307. First gear 318 and second gear 319 mesh, and step motor 307 drives first gear 318 during the operation and rotates, and first gear 318 drives second gear 319 again and rotates, and second gear 319 drives cross roller bearing 306 inner circle and rotates, finally drives outer box 304 and rotates, realizes the rotation of magazine, and the thick liquids of rotatory magazine is convenient for paint, helps thick liquids tiling on optical glass moreover, moreover the utility model discloses a rotatory magazine operates stably, uses with scraping mechanism 400 cooperation, can guarantee the degree of consistency and the precision that thick liquids were painted.

The utility model discloses box 303 and outer box 304 in rotatable magazine contains, interior box 303 and thick liquids direct contact, and its bottom is outer box 304 of transparent optical glass and embedding, can take out the clearance after the completion of print job at every turn, and outer box 304 can carry on spacingly and fixed to interior box 303. The lower part of the material box 300 is provided with a gear which can be driven to rotate by a stepping motor 307, and the material box can be used for printing in a larger area by selective rotation, and has simple and stable structure and reasonable component arrangement.

Elasticity buckle 302 exerts the pretightning force through clamping ring 301 and interior box 303 face contact, guarantee that magazine 300 possesses high stability in the forming process, high repeated positioning accuracy, solved the magazine and printed the in-process at 3D, thereby cause mechanical error to influence the product precision scheduling problem of printing the formed part because of rotary vibration and frequent dismouting, thereby guaranteed the quality and the precision of 3D printing each layer of in-process, and the simple operation, make things convenient for operating personnel to clear up the magazine, promote printing efficiency.

The scraping mechanism 400 includes: a scraper 406 and a screw fine adjustment device. As shown in fig. 8, 17 and 18, a screw fine-adjustment device is used to adjust the distance between the scraper 406 and the optical glass, and the scraper 406 is arranged on the screw fine-adjustment device and is used to scrape the slurry on the upper surface of the optical glass.

The spiral fine-tuning device comprises: cantilever 405, umbrella bolt 404, cantilever mounting base 403 and swivel nut 402. scraper 406 is mounted on cantilever mounting base 403 and within the print chamber of magazine 300. The body of the cantilever mounting base 403 is provided with a fine thread 413 which is matched with the rotating nut 402, and the rotating nut 402 is sleeved on the body of the cantilever mounting base 405. When the rotating nut 402 is rotated, the cantilever mounting support 403 moves along the axial direction thereof, so as to drive the scraper 406 to move along the axial direction of the cantilever mounting support 403, thereby realizing the adjustment of the distance between the scraper 406 and the optical glass, and realizing the precise control of the thickness of the scraped layer by adjusting the screw fine adjustment device. Preferably, the cantilever mounting support 403 may be marked with scale lines, and the user can visually adjust the height of the scraper when adjusting the height of the scraper.

The blade 406 is mounted on the cantilevered mounting support 403 by a cantilever 405. The mounting end 405a of the cantilever 405 is fixed on the top of the cantilever mounting support 403 by the umbrella-shaped bolt 404, the scraper 406 is arranged at the scraping end 405b of the cantilever 405, the scraping end 405b of the cantilever extends into the printing cavity of the material box, and most of the spiral fine-adjustment device is positioned outside the material box 300, so that the material can be scraped conveniently and the position of the scraper can be adjusted conveniently.

The smooth surface 405c is opened at the top of the installation end 405a of cantilever, and the bottom surface of the head of the umbrella bolt 404 is a plane, and when the installation end 405a of cantilever is screwed on the top end of the cantilever installation support 403 by the umbrella bolt 404, the smooth surface 405c of cantilever is attached to the bottom surface of the head of the umbrella bolt 404, so that the connection is more firm and stable.

As shown in fig. 19, the top surface of the cantilever mounting base 403 is recessed to form a first V-shaped abutment surface 408, and the first V-shaped abutment surface 408 is composed of a first plane 408a and first inclined surfaces 408b located at two sides of the first plane 408 a. The bottom of the mounting end 405a of the cantilever is provided with a protrusion 410 fitting with the groove to form a second V-shaped rest surface 409, and the second V-shaped rest surface 409 is composed of a second plane 409a and second inclined surfaces 409b positioned at two sides of the second plane 409 a. When the umbrella bolt 404 screws the cantilever mounting end 405a to the top of the cantilever mounting seat 403, the protrusion 410 is embedded in the groove, the first plane 408a is attached to the second plane 409a, and the first inclined plane 408b is attached to the second inclined plane 409 b.

The mechanical contact surface on the cantilever 405 side is three orthogonal planes, namely a second plane 409a and two second inclined planes 409b which are perpendicular to each other; the mechanical abutment surface on the cantilever mount 403 side is formed by three orthogonal planes, i.e., a first plane 408a and two first inclined surfaces 408b perpendicular to each other. The umbrella bolt 404 fixes the cantilever 405 to the cantilever mounting base 403 by surface contact, and the cantilever 405 and the cantilever mounting base 403 are in surface contact with each other by two mechanical contact surfaces, and three orthogonal planes provide high stability to the cantilever 405.

The spiral micromatic setting still includes: a stationary base 401 and a swivel nut end cap 407 threadably connected to the stationary base 401. The fixed base 401 is provided with a round-corner rectangular channel 411, and the bottom end of the cantilever mounting support 403 is provided with a round-corner rectangular boss 412 matched with the round-corner rectangular channel 411. The swivel nut end cover 407 covers the bottom of the cantilever mounting seat 403 and the swivel nut 402 in the fixed base 401, the fixed base 401 is disposed on the main body structure 500, and the rounded rectangular boss 412 is embedded in the rounded rectangular channel 411 to limit the rotational degree of freedom of the cantilever mounting seat 403. The swivel nut end cap 407, in cooperation with the fixed seat 401, defines 5 degrees of freedom for the swivel nut 402, leaving one degree of freedom for axial fine adjustment.

The cantilevered scraping end 405b is provided with a tool mounting surface 405d and the scraper 406 is secured to the cantilevered scraping end tool mounting surface 405d by screws to reduce tool mounting distortion. The tool mounting surface 405d of the cantilever is a finish plane, which reduces damage to a material blade such as ceramic due to mounting. The production cost is reduced, and the utilization rate of the cutter is improved. The scraper 406 is made of a ceramic material, and has the advantages of high melting point, high hardness, high wear resistance, oxidation resistance and the like. The swivel nut 402 acts as a ball in a ball screw and the cantilever mount 403 acts as a screw in a ball screw to convert the rotary motion to linear motion.

The scraping mechanism 400 is used in cooperation with the rotating magazine 300 to tile the slurry in the magazine 300, so that the slurry is convenient to cure. The scraping layer thickness of the scraping mechanism 400 is adjustable and has high stability, and the scraping mechanism 400 is a cantilever type and is matched with the cantilever mounting base 403 through a mechanical leaning surface, so that the scraping mechanism 400 has high stability. Through spiral adjustment, adjust scraping the bed thickness, the height-adjusting is accurate controllable.

Each component of spiral micromatic setting is stabilized the cooperation, makes the scraper possess high stability, high accuracy scraping the material in-process to make every layer scrape the even unanimity of material thickness and the bed thickness accuracy is controllable, improve shaping product precision and surface quality, improve structural performance, can solve at 3D printing in-process material inhomogeneous or print the bed thickness inaccuracy and the shaping effect of the shaping work piece that leads to is not good, the precision lower scheduling problem.

The main structure 500 is used to support all systems and mechanisms of the photo-cured ceramic 3D printer, as shown in fig. 8 and 20, and specifically includes: the box comprises a back plate 501, an upper plate 502 and a box body 503, wherein the upper plate 502 is arranged at the top of the box body 503, the back plate 501 is arranged on the upper surface of the upper plate 502, and the back plate 501 is perpendicular to the upper plate 502.

The back plate 501 and the upper plate 502 are made of aluminum materials and are light in weight. The box 503 is made of metal plate, and is used for bearing electrical components and providing sufficient height and space for the projection system 100, so that the stability of the whole structure is maintained, and the influence of mechanical resonance in the printing process is reduced.

Printing platform 200 is mounted on back plate 501 via linear guide rails, and printing platform 200 moves up and down on back plate 501 via linear guide rails. Printing platform 200 is disposed on main structure 500 through a transmission mechanism, and the transmission mechanism includes: a screw rod 504 and a motor for driving the screw rod to rotate. When the motor drives the screw to rotate forward/backward, the printing platform 200 reciprocates up and down along the linear guide rail. The printing platform 200 makes the printing platform perform reciprocating motion in the printing cavity of the material box 300 along the linear guide rail direction through two groups of linear guide rails and the screw rod, so that the solidified material is bonded at the bottom of the printing platform 200 and is formed in an overlapping mode. The printing platform 200 converts the rotary motion into the linear motion like the balls in the ball screw.

A grating ruler 505 is arranged on the right side of the back plate 501, and position detection control is performed on the printing platform 200 through the grating ruler 505, so that the consistency of the printing layer thickness is ensured. The upper side and the lower side of the left side of the back plate 501 are respectively provided with a mechanical limit 506, a photoelectric switch is arranged between the two mechanical limit 506, and the position monitoring is carried out by the auxiliary grating ruler 505. High reliability is guaranteed in the working process of the printer, and the optical glass 312 at the bottom of the material box 300 is prevented from being crushed by the printing platform 200.

The fixed base 401 of the fine screw adjustment device is fixed on the upper plate 502 by screw connection, and the projection system 100 is arranged in the box 503. The upper plate 502 is provided with a circular hollow groove 507, and the outer ring of the crossed roller bearing 306 is arranged in the circular hollow groove 507. The projection system 100 is located below the optical glass 312, and performs projection from bottom to top, and as the printing platform 200 gradually rises, after the scraping mechanism 400 finishes scraping, a light beam emitted by the projection system 100 penetrates through the optical glass 312, and the paste on the upper surface of the optical glass 312 is solidified on the printing platform surface of the printing platform 200 layer by layer.

Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

Claims

1. A novel scraper for 3D printing, characterized in that includes: the knife body and the cutting edge are positioned at the bottom of the knife body; the cutting edge includes: a nose portion, a front facet and a rear facet; the nose portion and the front blade face and/or the rear blade face form a pressure relief notch.

2. The novel doctor blade for 3D printing according to claim 1, wherein the blade tip portion and the back blade face form the pressure relief notch; the trailing edge face comprises: tilting the rear plane; an included angle between the inclined rear plane and the processing surface is 10-12 degrees; the included angle between the front edge face and the machining surface is 35-40 degrees.

3. The novel doctor blade for 3D printing according to claim 1, wherein the blade tip portion and the front blade face form the pressure relief notch, the blade tip portion being a flat surface; the front facet includes: the first front plane and the second front plane are in transition connection through an arc, and an included angle between the first front plane and the second front plane is 90 degrees.

4. The novel doctor blade for 3D printing according to claim 1, wherein the blade tip portion and the leading edge face form the pressure relief notch; the front facet includes: a vertical surface and a quarter-circle surface.

5. The novel doctor blade for 3D printing according to claim 1, wherein the tip portion and both the leading and trailing edge faces form the pressure relief notch; the front facet includes: inclining the front plane and the front cambered surface; the trailing edge face comprises: and a rear arc surface.

6. The novel doctor blade for 3D printing according to claim 1, wherein the tip portion forms the pressure relief notch with both the front and back blade faces, the tip portion being a semi-circular arc; the front facet includes: vertical surface and connection cambered surface.

7. The novel doctor blade for 3D printing according to claim 1, wherein the tip portion forms the pressure relief notch with both the front and rear blade faces, the tip portion being an arc-shaped face; the front facet includes: a bevel and a horizontal plane.

8. The novel doctor blade for 3D printing according to claim 1, wherein the tip portion forms the pressure relief notch with both the front and back blade faces, the tip portion being a flat surface; the front facet includes: the device comprises a first front inclined plane and a second front inclined plane, wherein the first front inclined plane and the second front inclined plane are in transition connection through a smooth cambered surface; the trailing edge face comprises: a rear inclined plane and a rear cambered surface.