CN114454294A

CN114454294A - Be used for cream material photocuring 3D printing device

Info

Publication number: CN114454294A
Application number: CN202210067869.2A
Authority: CN
Inventors: 肖创; 陈盛贵; 张海波; 唐建林; 王成运; 王飞洪; 李楠; 马宏伟; 卢秉恒
Original assignee: Dongguan University of Technology; Guangdong Hust Industrial Technology Research Institute
Current assignee: Dongguan University of Technology; Guangdong Hust Industrial Technology Research Institute
Priority date: 2022-01-20
Filing date: 2022-01-20
Publication date: 2022-05-10
Anticipated expiration: 2042-01-20
Also published as: CN114454294B

Abstract

The invention relates to a paste photocuring 3D printing device. The invention discloses a paste photocuring 3D printing device which comprises a shell, a material loading mechanism, a material spreading mechanism, a forming mechanism, a light source mechanism, a driving mechanism and a control mechanism, wherein the material loading mechanism, the material spreading mechanism, the forming mechanism, the light source mechanism, the driving mechanism and the control mechanism are arranged in the shell. The material spreading mechanism drives the first scraper and the second scraper to move up and down through the inclined plane of the strip-shaped wedge block and is fixed at different heights, so that the material spreading mechanism operates stably; the leakage phenomenon of the trough and the paste on the forming cylinder is avoided through the folding forming cylinder and the trough integrated structure, the system error of a complex mechanism is reduced, the using amount of the paste is reduced to a certain extent, and the forming precision is greatly improved while the time is greatly saved. The 3D printing device for paste photocuring is simple in structure and convenient to use, avoids complex and redundant steps in the printing process, is stable in operation, saves time for printing, is efficient and high in precision, and is easy to disassemble and convenient to clean after printing is finished.

Description

Be used for cream material photocuring 3D printing device

Technical Field

The invention relates to the technical field of printing, in particular to a paste photocuring 3D printing device.

Background

The 3D printing is also called additive manufacturing, and high-precision three-dimensional products can be finally obtained by printing layer by layer in modes of powder spraying and the like through a preset program and a digital model. Compared with conventional planar printing, 3D printing can provide a three-dimensional stereo model; compared with the common processing technology, the 3D printing precision and the automation degree are higher. The 3D printing technology has become a Rapid Prototyping technology (RP for short) commonly used in the industrial field. The method is based on a digital model, converts a designed object into a three-dimensional design drawing, and adopts the processes of layered processing and overlying bonding molding to increase materials layer by layer to finally manufacture a three-dimensional target product. The method is a novel processing technology, is different from the traditional industrial cutting processing technology, and is also called Additive Manufacturing (AM) in a 3D printing technology. The method can quickly and accurately manufacture the target product, avoids a large amount of waste caused by cutting the material, obviously improves the utilization rate of the material, and reduces the material cost and the manufacturing complexity. And 3D prints quick forming technique and can also realize the shaping of multiple material simultaneous high accuracy, and neotype digital manufacturing technique will give the very big impact of traditional manufacturing technique, brings a big revolution. In addition, the 3D printing technology has the advantages of generating parts of any shape directly from computer graphic data without machining or dies, greatly shortening the product development period, improving the production efficiency, and the like, and is called an important ring of the third industrial revolution.

Digital Light Processing (DLP) is an updated 3D forming technology developed and improved based on SLA type 3D printing technology. DLP type 3D printers are generally classified into two types, one is free surface imaging (also called top-down stereoscopic imaging) and the other is free surface imaging (also called bottom-up stereoscopic imaging). The DLP type 3D printer of free surface imaging has been slowly eliminated by the market because the whole printing platform needs to be immersed in the liquid light-cured material, the material dosage required for each printing is larger, and the up-and-down movement can also cause the material to splash and pollute the inner chamber of the printer. So a DLP type 3D printer for free form imaging is currently in common use. The DLP type 3D printer of the free-form surface imaging type adopts the working principle that a light source with a certain wavelength (ultraviolet light, near ultraviolet light, visible light and other wave bands) is used as an energy source, a high-resolution digital processor projector (DLP) designs the shape of each layer according to slices, the DLP is directly projected onto a plane at the bottom of a forming cylinder in an X-Y axis coordinate system from bottom to top, a liquid photo-curing polymer at the bottom of the forming cylinder directly absorbs the energy of the UV to initiate activation polymerization to form a curing layer, a printing platform moves in the Z axis direction, and the curing layer is peeled off from the bottom of the forming cylinder and adhered to the printing platform. The layers are repeatedly solidified and stacked layer by layer to form a complete model.

However, when the DLP photocuring 3D printer is used for printing a part model, on one hand, the printer controls the air pressure of the air cylinder by using the stepping motor so as to control the lifting of the spreading mechanism, the mechanism is complex in structure, and the problems of error superposition in the operation process of each structure exist; in addition, the pneumatic and electric starting and ending processes are easy to generate larger vibration, so that the precision control of the experiment is influenced; on the other hand, the printer adopts a rectangular or round forming cylinder made of metal materials, mainly comprises a cylinder sleeve and a piston, and a sealing ring is adopted between the cylinder sleeve and the piston for sealing, so that leakage is easily caused when sealing is not good. Further, when the printer is cleaned after printing is completed, it is difficult to remove the printer using a member such as a cylinder, and there are some dead spaces which are difficult to clean.

Disclosure of Invention

Based on this, the invention aims to provide a 3D printing device for photocuring paste, which has the advantages of simple structure, stable operation, time-saving printing, high efficiency, high precision, good sealing performance, easy disassembly and cleaning and the like.

A3D printing device for photocuring paste comprises a shell, a material loading mechanism, a material spreading mechanism, a forming mechanism, a light source mechanism, a driving mechanism and a control mechanism, wherein the material loading mechanism, the material spreading mechanism, the forming mechanism, the light source mechanism, the driving mechanism and the control mechanism are arranged in the shell;

the material loading mechanism comprises a material groove and a material groove support, and a notch is formed in the bottom of the material groove; the trough support is connected with the lower part of the trough and used for supporting the trough;

the material spreading mechanism comprises a first bearing plate, a first material spreading unit, a second material spreading unit, a first strip-shaped wedge block and a second strip-shaped wedge block; the first spreading unit comprises a first bearing, a first optical axis, a first scraper, a first elastic piece, a first ball stud, a first pressing self-locking device and a first telescopic rod; the first bearing is fixedly connected with the lower part of the first bearing plate, and one end of the first optical axis is in sliding connection with the first bearing; the first scraper is fixedly connected with the other end of the first optical axis; the first elastic piece is sleeved on the first bearing and the first optical axis, and two ends of the first elastic piece are respectively abutted against the first bearing plate and the first scraper; the first ball stud is fixedly connected with the first scraper; the first pressing self-locking device is fixedly connected with the upper part of the first bearing plate, one end of the first telescopic rod is fixedly connected with the first scraper, the other end of the first telescopic rod penetrates through the bearing plate and extends into the first pressing self-locking device, and the first telescopic rod can press the first pressing self-locking device to be locked or unlocked with the first pressing self-locking device; the second spreading unit is arranged in parallel relative to the first spreading unit and comprises a second bearing, a second optical axis, a second scraper, a second elastic piece, a second ball stud, a second pressing self-locking device and a second telescopic rod; the second bearing is fixedly connected with the lower part of the first bearing plate, and one end of the second optical axis is in sliding connection with the second bearing; the second scraper is fixedly connected with the other end of the second optical axis; the second elastic piece is sleeved on the second bearing and the second optical axis, and two ends of the second elastic piece are respectively abutted against the first bearing plate and the second scraper; the second ball stud is fixedly connected with the second scraper; the second pressing self-locking device is fixedly connected with the upper part of the second bearing plate, one end of the second telescopic rod is fixedly connected with the second scraper, the other end of the second telescopic rod penetrates through the bearing plate and extends into the second pressing self-locking device, and the second telescopic rod can press the second pressing self-locking device and lock or unlock the second pressing self-locking device; the first strip-shaped wedge block and the second strip-shaped wedge block are respectively arranged on two sides of the notch of the trough; the first strip-shaped wedge block comprises a first inclined surface, the second strip-shaped wedge block comprises a second inclined surface, and the first inclined surface and the second inclined surface are arranged oppositely;

the forming mechanism is arranged below the trough and comprises a folding forming cylinder, a forming supporting plate, a connecting mechanism and a forming platform; the folding forming cylinder can be stretched and folded, and the upper end of the folding forming cylinder is connected with the lower bottom of the trough; the forming supporting plate is connected with the lower end of the folding forming cylinder; the connecting mechanism comprises a screw rod, a leveling elastic piece, an adsorption magnet and a screw rod nut, the screw rod penetrates through the forming supporting plate and extends into the folding forming cylinder, the leveling elastic piece, the adsorption magnet and the screw rod nut are sequentially sleeved on the screw rod in the folding forming cylinder from bottom to top, and two ends of the elastic leveling piece are respectively abutted to the forming supporting plate and the adsorption magnet; the forming platform is made of a magnetic metal material, the forming platform is adsorbed on the screw nut by the adsorption magnet, and the forming platform can be embedded with the notch of the material groove when the folding forming cylinder is in a folding state and extends into the folding forming cylinder when the folding forming cylinder is in an extending state;

the light source mechanism is arranged above the material spreading mechanism and comprises a light machine, and the light machine emits laser energy to irradiate on the forming platform;

the driving mechanism comprises a first driving mechanism and a second driving mechanism, the first driving mechanism is used for driving the spreading mechanism to reciprocate in the horizontal direction, so that the first ball head pin and the second ball head pin can move on the first inclined plane or the second inclined plane in sequence, and the first driving mechanism is connected with the bearing plate; the second driving mechanism is used for driving the forming mechanism to move in the vertical direction and is connected with the forming supporting plate;

the control mechanism is used for controlling the operation of the optical machine, the first driving mechanism and the second driving mechanism.

According to the paste photocuring 3D printing device, the first scraper and the second scraper are driven to move up and down through the up-and-down movement of the first ball stud and the second ball stud on the first inclined plane or the second inclined plane, and the first scraper and the second scraper are fixed at different heights to be paved respectively by matching with the locking and unlocking of the first telescopic rod and the first pressing self-locker and the locking and unlocking of the second telescopic rod and the second pressing self-locker, so that the paving mechanism operates stably, paving is uniform and flat, the effect of alternately and efficiently paving the first scraper and the second scraper is achieved, the surface of a printed sample piece is smoother, and the printing efficiency is greatly improved; the integrated structure of the folding forming cylinder and the trough avoids leakage of the trough and paste on the folding forming cylinder, the second driving mechanism drives the forming mechanism to reciprocate and the folding forming cylinder to extend and fold, so that the thickness of the printed paste is controlled, the system error of a complex mechanism is reduced, the using amount of the paste is reduced to a certain extent, and the forming precision is greatly improved while the time is greatly saved. In addition, the 3D printing device for paste photocuring is relatively simple in structure, parts are easy to detach and replace, and cleaning work after printing work is finished is facilitated.

Furthermore, the first driving mechanism comprises a base, a first supporting plate, a second supporting plate, a first motor, a first transmission screw rod and a first transmission slide block, wherein the first supporting plate and the second supporting plate are respectively arranged on the base at intervals, the first motor is connected to the side wall of the first supporting plate, the first transmission screw rod is erected between the first supporting plate and the second supporting plate, one end of the first transmission screw rod penetrates through the first supporting plate to be rotatably connected with the first motor, and the other end of the first transmission screw rod is rotatably connected with the second supporting plate; the first transmission slide block penetrates through the first transmission screw rod and is rotatably connected with the first transmission screw rod, and the first transmission slide block is connected with the first bearing plate. First actuating mechanism simple structure easily dismantles, rotates through first transmission lead screw and drives first transmission slider horizontal migration, and then can make the first board horizontal migration of accepting that links to each other with first transmission slider to drive the first scraper of stone and second scraper round trip movement and carry out high-efficient stone.

Furthermore, the second driving mechanism comprises a support frame, a third support plate, a fourth support plate, a second motor, a second transmission screw rod and a second transmission slide block, the third support plate and the fourth support plate are respectively arranged at the top and the bottom of the support frame, the second motor is connected to the third support plate, the second transmission screw rod is arranged between the third support plate and the fourth support plate, one end of the first transmission screw rod penetrates through the third support plate to be rotatably connected with the second motor, and the other end of the first transmission screw rod is rotatably connected with the fourth support plate; the second transmission sliding block penetrates through the second transmission screw rod and is in rotary connection with the second transmission screw rod, and the second transmission sliding block is connected with the forming supporting plate. The second driving mechanism is simple in structure and easy to detach, the second driving screw rod is rotated to drive the second driving slide block to vertically move up and down, and then the forming supporting plate connected with the second driving slide block can vertically move up and down, so that the forming platform is driven to vertically move up and down, the folding forming cylinder is extended and folded, the forming platform is accurately controlled to move up and down, and the precision of the thickness of the printing layer is guaranteed.

Furthermore, there are two first bearings, two first optical axes and two first elastic members, and there are two second bearings, two second optical axes and two second elastic members; two first strip-shaped wedge blocks and two second strip-shaped wedge blocks are arranged; the number of the first ball stud pins and the number of the second ball stud pins are two; the two first bearings, the first optical axis and the first elastic piece are respectively arranged on two sides of the first telescopic rod in the horizontal reciprocating movement direction; the two second bearings, the second optical axis and the second elastic piece are respectively arranged on two sides of the second telescopic rod in the horizontal reciprocating movement direction; the two first strip-shaped wedges are arranged on the same side of the trough notch at intervals in parallel, and the two second strip-shaped wedges are arranged on the same other side of the trough notch at intervals in parallel; the two first ball stud pins are respectively connected to two ends of the first scraper; the two second ball stud pins are respectively connected to two ends of the second scraper; the two first ball stud pins and the two second ball stud pins can successively move on the two first inclined planes or the two second inclined planes. So set up, can make stone mechanism more steady in the course of the work, reduce vibrations.

Furthermore, the first elastic piece is sleeved on the first telescopic rod, and the second elastic piece is sleeved on the second telescopic rod.

Further, the material loading mechanism further comprises a feeder, a material supply hole is further formed in the bottom of the trough, the material supply hole is formed between the notch of the trough and the first strip-shaped wedge block and/or between the notch of the trough and the second strip-shaped wedge block, and the lower portion of the material supply hole is communicated with the feeder. When the amount of the paste in the trough is insufficient, the paste can be replenished into the trough from the feed hole by the feeder.

Furthermore, the material loading mechanism further comprises a material recovery cylinder, a material recovery port is arranged at the bottom of the trough, the material recovery port is arranged between the material supply hole and the first strip-shaped wedge block and/or between the material supply hole and the second strip-shaped wedge block, and the material recovery cylinder is connected below the material recovery port. The recovery material jar can retrieve the unnecessary cream material of first scraper or second scraper scraping down, avoids the cream material extravagant.

Further, the light source mechanism also comprises a reflector, and the light machine emits laser which is reflected on the forming platform by the reflector. The reflector can reflect the laser that the ray apparatus launches to the shaping platform on high-efficiently, carries out the photocuring shaping to the cream material, can reduce weakening and scattering of light intensity simultaneously furthest.

Further, a drawer type handle is connected to the outer side of the trough in an external mode, and the trough is connected with the trough supporting column in a sliding mode. The drawer type structure can more conveniently dismantle the silo and take out, is convenient for operation such as feed, washing.

Further, the paste photocuring 3D printing device further comprises a fan, and the fan is arranged on the shell. The device can produce the heat at the course of the work, and too high temperature can produce adverse effect to the operation of each mechanism, sets up the fan on the casing, can make the device cooling, guarantees to print work normal clear.

For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.

Drawings

Fig. 1 is a perspective view of a structure of a 3D printing apparatus for photocuring paste according to embodiment 1;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a right side view of FIG. 1;

FIG. 4 is a top view of the trough of FIG. 1;

FIG. 5 is a schematic structural view of the trough and the spreading mechanism of FIG. 1;

FIG. 6 is a front view of the placement mechanism of FIG. 5;

FIG. 7 is a left side view of the placement mechanism of FIG. 5;

FIG. 8 is a right side view of the placement mechanism of FIG. 5;

FIG. 9 is a top view of the placement mechanism and first drive mechanism of FIG. 1;

FIG. 10 is a schematic structural view of the trough, the forming mechanism and the second driving mechanism in FIG. 1;

FIG. 11 is a right side view of FIG. 10;

FIG. 12 is an enlarged view taken at A in FIG. 11;

fig. 13 is a schematic view of the folding forming cylinder of fig. 12, except for the folding forming cylinder.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "vertical direction", "up", "down", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be further noted that, unless otherwise specifically stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, connected through an intermediate medium, or connected through the insides of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Example 1

Referring to fig. 1-3, a 3D printing apparatus for photocuring paste according to the present invention includes a housing 100, a loading mechanism 10 disposed inside the housing 100, a spreading mechanism 20, a forming mechanism 30, a light source mechanism 40, a driving mechanism 50, and a control mechanism 60.

Referring to fig. 1, 3 and 4, the material loading mechanism 10 includes a trough 11 and a trough support 12, and the bottom of the trough is provided with a notch 111; the trough support 12 is connected to the lower part of the trough 11 and is used for supporting the trough 11.

Referring to fig. 4-7, the paving mechanism 20 includes a first receiving plate 21, a first paving unit 22, a second paving unit 23, a first strip-shaped wedge 24, and a second strip-shaped wedge 25; the first spreading unit 22 comprises a first bearing 221, a first optical axis 222, a first scraper 223, a first elastic member 224, a first ball stud 225, a first pressing self-locker 226 and a first telescopic rod 227; the first bearing 221 is fixedly connected with the lower part of the first bearing plate 21, and one end of the first optical axis 222 is in sliding connection with the first bearing 221; the first scraper 223 is fixedly connected with the other end of the first optical axis 222; the first elastic member 224 is sleeved on the first bearing 221 and the first optical axis 222, and two ends of the first elastic member 224 are respectively abutted against the first bearing plate 21 and the first scraper 223; the first ball stud 225 is fixedly connected with the first scraper 223; the first pressing self-locking device 226 is fixedly connected with the upper part of the first bearing plate 21, one end of the first telescopic rod 227 is fixedly connected with the first scraper 223, the other end of the first telescopic rod passes through the bearing plate 21 and extends into the first pressing self-locking device 226, and the first telescopic rod 227 can press the first pressing self-locking device 226 to be locked or unlocked with the first pressing self-locking device 226; the second spreading unit 23 is arranged in parallel with the first spreading unit 22, and the second spreading unit 23 includes a second bearing 231, a second optical axis 232, a second scraper 233, a second elastic member 234, a second ball stud 235, a second pressing self-locking device 236 and a second telescopic rod 237; the second bearing 231 is fixedly connected with the lower part of the first bearing plate 21, and one end of the second optical axis 232 is in sliding connection with the second bearing 231; the second scraper 233 is fixedly connected with the other end of the second optical axis 232; the second elastic member 234 is sleeved on the second bearing 231 and the second optical axis 232, and two ends of the second elastic member 234 are respectively abutted against the first bearing plate 21 and the second scraper 233; the second ball stud 235 is fixedly connected with the second scraper 233; the second pressing self-locking device 236 is fixedly connected with the upper part of the second bearing plate 21, one end of a second telescopic rod 237 is fixedly connected with the second scraper 233, the other end of the second telescopic rod 237 passes through the bearing plate 21 and extends into the second pressing self-locking device 236, and the second telescopic rod 237 can press the second pressing self-locking device 236 to lock or unlock with the second pressing self-locking device 236; the first strip-shaped wedge block 24 and the second strip-shaped wedge block 25 are respectively arranged at two sides of the notch 111 of the trough 11; the first strip-shaped wedge 24 comprises a first inclined surface 241, the second strip-shaped wedge 25 comprises a second inclined surface 251, and the first inclined surface 241 and the second inclined surface 251 are oppositely arranged; first ball stud 225 and second ball stud 235 are each movable on first ramp 241 and second ramp 251.

Referring to fig. 4-7, in a preferred embodiment, two first strip wedges 24 and two second strip wedges 25 are respectively disposed at four corners of the bottom of the trough 11; two first bearings 221, two first optical axes 222, and two first elastic members 224 are respectively disposed on two sides of the first telescopic rod 227 in the horizontal reciprocating direction; two second bearings 231, two second optical axes 232 and two second elastic members 234 are respectively arranged at two sides of the second telescopic rod 237 in the horizontal reciprocating direction; the first scraper 223 and the second scraper 233 are both arranged obliquely outwards, so that material spreading is facilitated; two first ball stud pins 225 are respectively and fixedly connected to two ends of the upper part of the first scraper 223; two second ball stud pins 235 are respectively and fixedly connected to two ends of the upper part of the second scraper 233. The first scraper 223 and the second scraper 233 are obliquely arranged, so that the paving effect of the first scraper 223 and the second scraper 233 is more uniform and smoother, and redundant paste can be taken away during paving. Two first strip wedges 24 and two second strip wedges 25 are provided; two first bearings 221, two first optical axes 222, and two first elastic members 224; two second bearings 231, two second optical axes 232 and two second elastic members 234; two first ball stud pins 225 are provided; two second ball stud pins 235 are provided; so set up, can make stone mechanism 20 more steady in the course of the work, reduce vibrations.

When the paving mechanism 20 works, the first bearing plate 21 moves left and right in the horizontal direction, so that the first scraper 223 and the second scraper 233 are driven to move left and right for paving, and the first ball stud 225 and the second ball stud 235 can move on the first inclined surface 241 or the second inclined surface 251 successively. As first ball stud 225 and second ball stud 235 move up first sloped surface 241 or second sloped surface 251, first ball stud 225 and second ball stud 235 are displaced upward. When the first ball stud 225 moves upward on the first inclined surface 241 or the second inclined surface 251, the first ball stud 225 pushes up the first scraper 223, and the first telescopic rod 227 presses the first pressing latch 226 to lock or unlock the first pressing latch 226. Assuming that the initial state of the first telescopic rod 227 and the first pressing latch 226 is an unlocked state, the first telescopic rod 227 presses the first pressing latch 226 and the first pressing latch 226 to be locked, that is, the first scraper 223 pushes up while the first optical axis 222 pushes up, the first optical axis 222 slides upwards in the first bearing 221, the first elastic member 224 compresses, the first telescopic rod 227 presses the first pressing latch 226 and the first pressing latch 226 to be locked, when the first ball stud 225 moves downwards, the first telescopic rod 227 rebounds and falls down by a small distance under the action of the first elastic member 224, and the first telescopic rod 227 and the first pressing latch 226 are locked, so that the rebounded distance after locking is smaller than the lifted distance before locking, and the vertical height of the first scraper 223 after locking is higher than that before locking. Assuming that the initial state of the first telescopic rod 227 and the first pressing latch is a locked state, the first telescopic rod 227 presses the first pressing latch 226 to unlock the first pressing latch 226, that is, the first scraper 223 pushes up while the first optical axis 222 pushes up, the first optical axis 222 slides upwards in the first bearing 221, the first elastic member 224 compresses, the first telescopic rod 227 and the first pressing latch 226 unlock, and when the first ball stud 225 moves downwards, the first telescopic rod 227 and the first pressing latch 226 unlock, and the first scraper 223 rebounds downwards for a certain distance under the elastic force of the first elastic member 224. That is, when the first telescopic bar 227 is locked with the first press latch 226, the height of the first scraper 223 in the vertical direction is higher than the height of the first telescopic bar 227 when the first push latch 226 is unlocked.

Similarly, when the second telescopic rod 237 is locked with the second pressing latch 236, the height of the second scraper 237 in the vertical direction is higher than the height of the second telescopic rod 237 in the vertical direction when the second telescopic rod 237 is unlocked with the second pressing latch 236. Therefore, during the operation of the paving mechanism 20, the locking or unlocking of the first telescopic rod 227 and the first pressing self-locker 226 is opposite to the locking or unlocking of the second telescopic rod 237 and the second pressing self-locker 236, so that a height difference exists between the first scraper 223 and the second scraper 233, and the paving of the first scraper 223 or the second scraper 233 is facilitated. That is, when the first telescopic rod 227 is locked with the first pressing latch 226, the second telescopic rod 237 and the second pressing latch 236 are unlocked, and at this time, the height of the first scraper 223 in the vertical direction is higher than that of the second scraper 233, and the second scraper 233 is used for spreading; conversely, when the first telescopic rod 227 is unlocked from the first press latch 226, the second telescopic rod 237 is locked from the second press latch 236, and the height of the first scraper 223 in the vertical direction is lower than that of the second scraper 233, and the first scraper 223 is used for paving.

Referring to fig. 3, the forming mechanism 30 is disposed below the trough 11, and referring to fig. 10-13, the forming mechanism 30 includes a folding forming cylinder 31, a forming support plate 32, a connecting mechanism 33, and a forming platform 34; the folding forming cylinder 31 can be stretched and folded, and the upper end of the folding forming cylinder 31 is connected with the lower bottom of the trough 11; the forming supporting plate 32 is connected with the lower end of the folding forming cylinder 31; the connecting mechanism 33 comprises a screw 331, a leveling elastic piece 332, an adsorption magnet 333 and a screw nut 334, the screw 331 penetrates through the forming support plate 32 and extends into the folding forming cylinder 31, the leveling elastic piece 332, the adsorption magnet 333 and the screw nut 334 are sequentially sleeved on the screw 331 from bottom to top in the folding forming cylinder 31, and two ends of the elastic leveling piece 332 are respectively abutted to the forming support plate 32 and the adsorption magnet 333; the forming table 34 is made of a magnetic metal material, the forming table 34 is attracted to the screw nut 334 by the attracting magnet 333, and the forming table 34 can be fitted into the notch 111 of the trough 11 when the folding forming cylinder is in the folded state and can be inserted into the folding forming cylinder 31 when the folding forming cylinder is in the extended state. In the embodiment of the present invention, there are four screw rods 331, leveling elastic members 332, attracting magnets 333, and screw nuts 334, i.e. 4 connecting mechanisms, respectively, so that the forming platform 34 is smoothly attracted to the screw nuts.

Referring to fig. 1 and 2, the light source mechanism 40 is disposed above the spreading mechanism, and the light source mechanism 40 includes a light machine 41; in one embodiment, the light source mechanism 40 may further include a reflector 42, and the optical engine 41 emits laser light to be reflected on the forming platform by the reflector 42. The reflector is formed by grinding the reflector by an advanced process, plating aluminum as a reflector, attaching the CMOS substrate to a glass substrate containing a transparent electrode, injecting liquid crystal for packaging, and can efficiently reflect laser emitted by the optical machine to a forming platform to carry out photocuring forming on the paste and simultaneously reduce the attenuation and scattering of light intensity to the maximum extent.

Referring to fig. 1, 10-11, the driving mechanism 50 includes a first driving mechanism 51 and a second driving mechanism 52, the first driving mechanism 51 is used for driving the spreading mechanism 20 to reciprocate in the horizontal direction, so that the first ball stud 225 and the second ball stud 235 can move on the first inclined surface 241 or the second inclined surface 251 successively, and the first driving mechanism 51 is connected with the receiving plate 21; the second driving mechanism 52 is used for driving the vertical movement of the forming mechanism 30, and the second driving mechanism 52 is connected with the forming support plate 32.

Referring to fig. 9, in a specific embodiment, the first driving mechanism 51 may include a base 511, a first supporting plate 512, a second supporting plate 513, a first motor 514, a first driving screw 515, and a first driving slider 516, the first supporting plate 512 and the second supporting plate 513 are respectively disposed on the base 511 at intervals, the first motor 514 is connected to a sidewall of the first supporting plate 512, the first driving screw 515 is disposed between the first supporting plate 512 and the second supporting plate 513, and one end of the first driving screw 515 passes through the first supporting plate 512 to be rotatably connected to the first motor 514, and the other end of the first driving screw 515 is rotatably connected to the second supporting plate 513; the first transmission sliding block 516 penetrates through the first transmission screw mandrel 515 and is rotatably connected with the first transmission screw mandrel 516, and the first transmission sliding block 516 is connected with the first bearing plate 21. After the first motor is started 514, the first transmission screw 515 rotates forward or reversely, and drives the first transmission slide block 516 to move horizontally left and right on the first screw 515, so as to drive the first bearing plate 21 to move horizontally left and right, and further drive the first scraper 223 and the first ball stud 225, the second scraper 233 and the second ball stud 235 to move horizontally left and right.

In other embodiments of the present invention, a first fixed slide rod (not shown) may be respectively disposed between the first support plate 512 and the second support plate 513 on both sides of the first transmission screw 515, and the first transmission slide block 516 passes through the first fixed slide rod and is slidably connected to the first fixed slide block 516, so that the first transmission slide block 516 smoothly moves horizontally.

Referring to fig. 10 to 11, in the embodiment of the present invention, the second driving mechanism 52 includes a supporting frame 521, a third supporting plate 522, a fourth supporting plate 523, a second motor 524, a second transmission screw 525 and a second transmission slider 526, the third supporting plate 522 and the fourth supporting plate 523 are respectively disposed at the top and the bottom of the supporting frame 521, the second motor 524 is connected to the third supporting plate 522, the second transmission screw 525 is disposed between the third supporting plate 522 and the fourth supporting plate 523, one end of the first transmission screw 525 passes through the third supporting plate 522 to be rotatably connected to the second motor 524, and the other end of the first transmission screw 525 is rotatably connected to the fourth supporting plate 523; the second transmission slide block 526 penetrates through the second transmission screw rod 525 and is rotatably connected with the second transmission screw rod 526, and the second transmission slide block 526 is connected with the forming supporting plate 32. In one embodiment, the second drive mechanism 52 may further include a converter 527, a second receiving plate 528, a second stationary slide 529; the second motor 524 is connected with a second transmission screw rod 525 through a converter 527; the second bearing plate 528 is fixedly connected with the support frame 521 through the second transmission screw rod 525 and arranged between the fourth support plates of the third support plate; two second fixed slide bars 529 are respectively arranged at two sides of the second transmission screw rod 525; two ends of the second fixed sliding block 526 are fixedly connected with the second bearing plate 528 and the fourth supporting plate 523 respectively, and the second fixed rod 529 passes through the second transmission sliding block 526 and is connected with the second fixed sliding block 526 in a sliding manner respectively. After the second motor is started 524, the second transmission screw rod 525 rotates forward or backward to drive the second transmission slide block 526 to move vertically upward or downward on the second transmission screw rod 525, so as to drive the forming support plate 32 to move vertically upward or downward, and thus drive the forming platform 34 to move vertically upward or downward.

The control mechanism 60 is used to control the operation of the optical machine 41, the first drive mechanism 51, and the second drive mechanism 52. Referring to fig. 1 and 2, in one embodiment, the control mechanism 60 may include 3 circuit boards connected to computer software, and the circuit boards store operation control programs for respectively controlling the operations of the optical machine 41, the first driving mechanism 51, and the second driving mechanism 52.

In one embodiment, the loading mechanism 10 may further include a supply machine (not shown); referring to fig. 4 and 5, the bottom of the trough 11 is further provided with a feeding hole 112, the feeding hole 112 is disposed between the notch 111 of the trough 11 and the first strip-shaped wedge 24, and/or disposed between the notch 111 of the trough 11 and the second strip-shaped wedge 25, and the feeding machine is communicated below the feeding hole 112.

In one embodiment, the loading mechanism 10 may further include a recycling cylinder (not shown); referring to fig. 4 and 5, the bottom of the trough 11 is further provided with a recycling port 113, the recycling port 113 is disposed between the recycling hole 112 and the first strip-shaped wedge 24, and the recycling cylinder is connected below the recycling port 113.

Referring to fig. 1, in a preferred embodiment, the trough 11 is externally connected with a drawer type handle 13, and the trough 11 is slidably connected with the trough support 12. The trough support columns 12 are 4 and are respectively connected with the lower part of the trough 11 and used for supporting the trough 11. Referring to fig. 3, the trough 11 is provided with a slide bar 14, the trough support 12 is provided with a chute, and the trough 11 is slidably connected with the chute of the trough support 12 through the slide bar 14, so that when the drawer type handle 13 is pulled, the trough 11 can slide out along the pulling direction, the trough is more conveniently drawn out, and operations such as loading and cleaning are facilitated.

Referring to fig. 1 and 2, the device for photocuring paste 3D printing according to the present invention further includes a blower 70, and the blower 70 is disposed on the housing 100. The device can produce the heat at the course of the work, and too high temperature is to the operation of each mechanism or produce adverse effect, sets up fan 70 on the casing, can make the device cooling, guarantees to print the work and normally goes on.

In other embodiments, the first elastic member may further be sleeved on the first telescopic rod, and the second elastic member may further be sleeved on the second telescopic rod.

According to the paste photocuring 3D printing device, the trough 11, the first optical axis 221, the first bearing 222, the first scraper 223, the first elastic piece 224, the first ball stud 225, the first pressing self-locking device 226, the second bearing 231, the second optical axis 232, the second scraper 233, the second elastic piece 234, the second ball stud 235, the second pressing self-locking device 236, the first strip-shaped wedge 24 and the second strip-shaped wedge 25 are all preferably made of stainless steel materials, and the stainless steel has the characteristics of heat resistance, corrosion resistance, wear resistance and the like, can resist scaling, can maintain strength at high temperature, and can bear daily wear. The first bearing plate 21, the first telescopic rod 227 and the second telescopic rod 237 are preferably made of aluminum alloy, the aluminum alloy is milled into a proper shape according to a processing drawing by a milling machine, and the aluminum alloy has high stability, is not easy to react with materials and has light texture. The forming platform 34 is made of magnetic metal material, and can be one or more of iron, nickel and cobalt, preferably teflon, which has the characteristics of acid and alkali resistance and resistance to various organic solvents, and is almost insoluble in all solvents. The folding forming cylinder 31 is preferably made of elastic rubber or silica gel materials, the elastic rubber or silica gel materials are selected, the folding forming cylinder has certain chemical compatibility with most of paste materials, the gelling phenomenon is effectively inhibited, and the folding forming cylinder is common and easy to obtain and low in price.

The invention discloses a paste photocuring 3D printing device, which comprises the following working processes:

before printing starts, the first driving mechanism 51 is controlled to horizontally move the first bearing plate 21 to a position between the notch 111 and the second strip-shaped wedge 25 of the trough 11, so that the first telescopic rod 227 is locked with the first pressing self-locking device 226, the second telescopic rod 237 is unlocked with the second pressing self-locking device 236, at this time, the height of the first scraper 223 is higher than that of the second scraper 233, the second scraper 233 is used for spreading, the forming platform 34 is embedded with the notch 111 of the trough 11, paste is filled into the trough 11, or the trough is supplied with the paste from the supply hole 113 through a supply machine, the control mechanism 60 is started, slice layering of a printing model is set, and printing is started;

the control mechanism 60 controls the second driving mechanism 52 to drive the forming support plate 32 to move vertically downwards, so that the forming platform 34 moves vertically downwards to set the first model layer height; the control mechanism 60 controls the first driving mechanism 51 to drive the first bearing plate 21 to horizontally move from the second strip-shaped wedge 25 to the first strip-shaped wedge 24, and at this time, the second scraper 233 starts to spread the paste, so that the forming platform is fully spread with the paste; when the first bar-shaped wedge 24 horizontally moves to the first inclined surface 241 of the first bar-shaped wedge 24, the first ball stud 225 and the second ball stud 235 successively move upwards along the first inclined surface 241, at this time, the first ball stud 225 pushes up the first scraper 223, and the first telescopic rod 227 presses the first pressing self-locking device 226, so that the first telescopic rod 227 and the first pressing self-locking device 226 are changed from locking to unlocking; the second ball stud 235 pushes up the second scraper 233, and the second telescopic rod 237 presses the second pressing self-locker 236, so that the second telescopic rod 237 and the second pressing self-locker 236 are changed from unlocking to locking; the control mechanism 60 controls the optical machine 41 to emit the first model layer laser, and the paste on the forming platform 34 is reflected by the reflector 42, so that the paste is photocured and formed, and the first model layer printing is completed;

the control structure 60 controls the second driving mechanism 52 to drive the forming pallet 32 to move vertically downward, so that the forming platform 34 moves vertically downward by a set second model layer height; the control structure 60 controls the first driving mechanism 51 to drive the first bearing plate 21 to horizontally move from the first strip-shaped wedge 24 to the second strip-shaped wedge 25, at this time, the second ball stud 235 and the first ball stud 225 successively move downward along the first inclined surface 241 to leave the first inclined surface, at this time, under the action of the second elastic member 234, the second expansion link 237 rebounds and falls a short distance, because the second expansion link 237 is locked with the second pressing self-locking device 236, the rebounding distance after locking is smaller than the ascending distance before locking, so that the vertical height of the second scraper 233 after locking is larger than the height before locking; the first scraper 223 is unlocked by the first telescopic rod 227 and the first pressing self-locking device 226, under the action of the first elastic member 224, the first scraper 223 naturally falls down along with the first ball stud 225 leaving the first inclined surface 241, after leaving the first inclined surface 241, the height of the first scraper 223 is lower than that of the second scraper 233, and at this time, the first scraper 223 starts spreading materials, so that the first model layer is fully spread with paste materials; when the horizontal movement is carried out to the second inclined surface 251 of the second strip-shaped wedge 25, the second ball stud 235 and the first ball stud 225 successively move upwards along the second inclined surface 251, at this time, the second ball stud 235 pushes up the second scraper 233, and the second telescopic rod 237 presses the second pressing self-locking device 236, so that the second telescopic rod 237 and the second pressing self-locking device 236 are changed from locking to unlocking; the first ball stud 225 pushes up the first scraper 223, and the first telescopic rod 227 presses the first pressing self-locking device 226, so that the first telescopic rod 227 and the first pressing self-locking device 226 are changed from unlocking to locking; the control mechanism 60 controls the optical machine 41 to emit the laser of the second model layer, and the paste on the first model layer is reflected by the reflector 42, so that the paste is photocured and formed, and the printing of the second model layer is completed;

the control structure 60 controls the second driving mechanism 52 to drive the forming pallet 32 to move vertically downward, so that the forming platform 34 moves vertically downward to a third model layer height; the control structure 60 controls the first driving mechanism 51 to drive the first bearing plate 21 to horizontally move from the second strip-shaped wedge 25 to the first strip-shaped wedge 24, at this time, the first ball stud 225 and the second ball stud 235 successively move downwards along the second inclined surface 251 to leave the second inclined surface, at this time, under the action of the first elastic piece 224, the first telescopic rod 227 rebounds and falls for a short distance, and because the first telescopic rod 227 is locked with the first pressing self-locking device 226, the rebounding distance after locking is smaller than the ascending distance before locking, so that the vertical height of the first scraper 223 after locking is larger than that before locking; the second scraper 233 is unlocked by the second telescopic rod 237 and the second pressing self-locking device 236, under the action of the second elastic member 234, the second scraper 233 naturally falls off along with the second ball stud 235 leaving the second inclined plane 251, after leaving the second inclined plane 241, the height of the second scraper 233 is lower than that of the first scraper 223, and at this time, the second scraper 233 starts to spread, so that the second model layer is fully spread with the paste; when the first bar-shaped wedge 24 horizontally moves to the second inclined surface 241 of the first bar-shaped wedge 24, the first ball stud 225 and the second ball stud 235 successively move upwards along the first inclined surface 241, at this time, the first scraper 223 pushes the first ball stud 225 upwards, and the first telescopic rod 227 presses the first pressing self-locking device 226, so that the first telescopic rod 227 and the first pressing self-locking device 226 are changed from locking to unlocking; the second ball stud 235 pushes up the second scraper 233, and the second telescopic rod 237 presses the second pressing self-locker 236, so that the second telescopic rod 237 and the second pressing self-locker 236 are changed from unlocking to locking; the control mechanism 60 controls the optical machine 41 to emit laser of the third model layer, and the paste on the forming platform 34 is reflected by the reflector 42, so that the paste is photocured and formed, and the printing of the third model layer is completed; the printing is repeated in this way layer by layer, and the folding forming cylinder 31 slowly extends from the folding state until the printing of the printing model is finished;

after printing, the control mechanism 60 controls the second driving mechanism 52 to drive the forming supporting plate 32 to move vertically upwards, so that the forming platform 34 moves vertically upwards to be embedded in the notch 111 of the forming platform 34 and the trough 11, meanwhile, the folding forming cylinder 31 moves upwards, the folding forming cylinder 31 is slowly folded in an extending shape, the control mechanism 60 is closed, the forming platform 34 loaded with the printing model is taken down, and printing work is completed.

The paste photocuring 3D printing device can be used for printing most of paste with high solid content, such as: lunar soil paste, simulated lunar soil paste, zirconia paste, alumina paste, silicon carbide paste and other ceramic pastes. In addition, the invention can also satisfy the printing of various material forms, for example, powder metallurgy, inorganic non-metallic materials, even metal powder and the like can be printed by adopting the device.

According to the paste photocuring 3D printing device, the shell can be detachably arranged to be a sealed shell, high-strength and high-standard accessories suitable for the outer space environment are adopted, stable machine operation is guaranteed in the environment with severe temperature difference and microgravity, and forming printing of the paste in the outer space can be achieved. For example, the paste photocuring 3D printing apparatus of the present invention can be used for printing of simulated lunar soil paste, controlling the solid content of the simulated lunar soil paste to 45-60 vol%, obtaining a mixture by mixing a certain amount of simulated lunar soil with agate beads of different sizes and absolute ethanol in a High Density Polyethylene (HDPE) bottle, processing the mixture in a ball mill for 20h at a speed of 450rpm to obtain a finer powder, and then cleaning and drying the ground simulant in an ultrasonic cleaner; mixing light-cured resin (HDDA) and powder (added in batches) according to a certain proportion, and adding 1-3 wt% of each of photoinitiators TPO and 819 according to the proportion of 1: 1; the dispersant adopts BYK11, the surfactant adopts dibutyl phthalate, and finally the leveling agents 2500 and 450 in a certain proportion are added, and ball milling is carried out in a ball mill to synthesize the simulated lunar soil paste. The paste photocuring 3D printing device for the paste is adopted to print a model, the light intensity suitable for printing is set, the layer thickness is 25 microns, the exposure time of each layer is 2, 4, 8 and 16 seconds, the paste simulating lunar soil is sent into a material groove to be printed, and a part model with good mechanical property can be obtained. The existing 3D printing device for lunar soil simulation paste is low in printing efficiency, large in equipment size and difficult to transport to the moon; moreover, the direct sintering precision of solar energy is low, the strength is poor, and the practicability is not high; the requirement on powder is high, and the corresponding powder is difficult to obtain on the moon; in addition, micro-extrusion ink printing requires mixing of large amounts of liquid materials, which are difficult to be compatible in the microgravity environment of the moon. The paste photocuring 3D printing device can be used for simulating the printing of lunar soil paste, the size of the whole device can be not more than 482.6mm × 173.4mm × 684.2mm according to transportation requirements, the weight of the device is not more than 16kg, the transportation is convenient, and the forming printing of the lunar soil paste can be simulated; the material is standard to be practiced thrift, adopts the high strength that is fit for outer space environment, and high standard accessory guarantees under the environment that the difference in temperature is violent and microgravity, and the device operation is stable.

Compared with the prior art, the 3D printing device for paste photocuring is simple in structure and convenient to use, avoids complex and redundant steps in the printing process, is stable in operation, saves time in printing, is efficient and high in precision, and is easy to disassemble and convenient to clean after printing is finished.

The above description is only intended to represent a few embodiments of the present invention, and the description is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, to those skilled in the art, changes and modifications may be made without departing from the spirit of the present invention, and it is intended that the present invention encompass such changes and modifications.

Claims

1. The utility model provides a be used for cream material photocuring 3D printing device which characterized in that: the device comprises a shell, a material loading mechanism, a material paving mechanism, a forming mechanism, a light source mechanism, a driving mechanism and a control mechanism, wherein the material loading mechanism, the material paving mechanism, the forming mechanism, the light source mechanism, the driving mechanism and the control mechanism are arranged in the shell;

2. The device for photocuring 3D printing of paste according to claim 1, characterized in that: the first driving mechanism comprises a base, a first supporting plate, a second supporting plate, a first motor, a first transmission screw rod and a first transmission slide block, wherein the first supporting plate and the second supporting plate are arranged on the base at intervals, the first motor is connected to the side wall of the first supporting plate, the first transmission screw rod is erected between the first supporting plate and the second supporting plate, one end of the first transmission screw rod penetrates through the first supporting plate to be rotatably connected with the first motor, and the other end of the first transmission screw rod is rotatably connected with the second supporting plate; the first transmission slide block penetrates through the first transmission screw rod and is rotatably connected with the first transmission screw rod, and the first transmission slide block is connected with the first bearing plate.

3. The device for photocuring 3D printing of paste according to claim 1, characterized in that: the second driving mechanism comprises a support frame, a third support plate, a fourth support plate, a second motor, a second transmission screw rod and a second transmission slide block, the third support plate and the fourth support plate are respectively arranged at the top and the bottom of the support frame, the second motor is connected to the third support plate, the second transmission screw rod is arranged between the third support plate and the fourth support plate, one end of the first transmission screw rod penetrates through the third support plate to be rotatably connected with the second motor, and the other end of the first transmission screw rod is rotatably connected with the fourth support plate; the second transmission sliding block penetrates through the second transmission screw rod and is in rotary connection with the second transmission screw rod, and the second transmission sliding block is connected with the forming supporting plate.

4. The device for photocuring 3D printing of paste according to claim 1, characterized in that: the number of the first bearings, the number of the first optical axes and the number of the first elastic members are two, and the number of the second bearings, the number of the second optical axes and the number of the second elastic members are two; two first strip-shaped wedge blocks and two second strip-shaped wedge blocks are arranged; the number of the first ball stud pins and the number of the second ball stud pins are two; the two first bearings, the first optical axis and the first elastic piece are respectively arranged on two sides of the first telescopic rod in the horizontal reciprocating movement direction; the two second bearings, the second optical axis and the second elastic piece are respectively arranged on two sides of the second telescopic rod in the horizontal reciprocating movement direction; the two first strip-shaped wedges are arranged on the same side of the trough notch at intervals in parallel, and the two second strip-shaped wedges are arranged on the same other side of the trough notch at intervals in parallel; the two first ball stud pins are respectively connected to two ends of the first scraper; the two second ball stud pins are respectively connected to two ends of the second scraper; the two first ball stud pins and the two second ball stud pins can successively move on the two first inclined planes or the two second inclined planes.

5. The device for photocuring 3D printing of paste according to claim 1, characterized in that: the first elastic piece is sleeved on the first telescopic rod, and the second elastic piece is sleeved on the second telescopic rod.

6. The device for photocuring 3D printing of paste according to claim 1, characterized in that: the material loading mechanism further comprises a feeder, a material supply hole is further formed in the bottom of the trough, the material supply hole is formed between the notch of the trough and the first strip-shaped wedge block and/or between the notch of the trough and the second strip-shaped wedge block, and the lower portion of the material supply hole is communicated with the feeder.

7. The device for photocuring 3D printing of paste according to claim 6, characterized in that: the material loading mechanism further comprises a material recovery cylinder, a material recovery port is arranged at the bottom of the material groove, the material recovery port is arranged between the material supply hole and the first strip-shaped wedge block and/or between the material supply hole and the second strip-shaped wedge block, and the material recovery cylinder is connected below the material recovery port.

8. The device for photocuring 3D printing of paste according to claim 1, characterized in that: the light source mechanism further comprises a reflector, and the light machine emits laser which is reflected on the forming platform by the reflector.

9. The device for photocuring 3D printing of paste according to claim 1, characterized in that: the outer side of the trough is externally connected with a drawer type handle, and the trough is connected with the trough support in a sliding mode.

10. The device for photocuring 3D printing of paste according to claim 1, characterized in that: still include the fan, the fan sets up on the casing.