CN104260350B - A kind of 3D printing equipment with rotary digital valve - Google Patents
A kind of 3D printing equipment with rotary digital valve Download PDFInfo
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- CN104260350B CN104260350B CN201410473585.9A CN201410473585A CN104260350B CN 104260350 B CN104260350 B CN 104260350B CN 201410473585 A CN201410473585 A CN 201410473585A CN 104260350 B CN104260350 B CN 104260350B
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Abstract
The invention discloses a kind of 3D printing equipment with rotary digital valve.Rotary digital valve prints the control element of spraying system as 3D, is made up of parts such as spool, valve pocket, valve body and displacement transducers the most respectively.Have the notch of periodic distribution on two convex shoulders of spool, valve pocket surface corresponding thereto has charging hole and negative pressure hole that corresponding spool is arranged；Spool is driven by motor and rotates, and in conjunction with the change in location of charging hole with negative pressure hole with spool symmetric triangular groove, it is achieved periodically quick on-off, thus reaches to spray the high-frequency output of drop.This device has linkage return adsorption structure, can eliminate the phenomenon that between twice injection, liquid drips because of gravity, highly reliable.Additionally, this knob structure makes to spray the output flow of drop, with spool high-speed rotary then increase rapidly, be particularly suited for the technical grade rapid shaping field of high frequency sound and big flow.
Description
Technical field
The present invention relates to the device for rapid shaping, particularly relates to a kind of 3D printing equipment with rotary digital valve.
Background technology
The 3D printing technique of current main-stream, by successively superposition and the curing molding of material, it is achieved quickly manufacture.In individual layer print procedure, in printhead working chamber, fluent material forms drop under the effect of external motivating force, and is ejected into relevant position with certain frequency and speed.Therefore, stable, accurately and quickly droplet ejection is to ensure that the key of 3D print quality.
3D droplet ejection mainly has hot bubble type, piezoelectric type and valve-regulated three kinds of forms.Hot bubble type (such as referenced patent 200980159776.5) by fluent material is heated to 300 DEG C to produce vapor bubbles, make material extrude separation at nozzle；But, elevated heating processes proposes rigors to printed material and shower nozzle, significantly have compressed its range.Piezoelectric type is (such as referenced patent 201110098956.6, US10035055) principle utilizing piezoelectric to produce deformation when energising realizes injection, have that injection apparatus is simple, accuracy of spray relatively advantages of higher, but because piezoelectric deformation range is limited, be mainly used in small flow system.Valve-regulated (such as referenced patent US005988807A) is then that the fast opening and closing by spool forms discrete injection drop, increase spool aperture and can promote rapidly injection flow, the big traffic demand printed in the face of technical grade 3D, this spray regime has been increasingly becoming study hotspot.But, it still suffers from following some shortcomings, mainly shows themselves in that
1) printing effect as core index is the most not enough, constrains the further large-scale promotion that 3D prints.Current valve-regulated injection mainly uses Direct Action Type switch valve, and this valve each keying cycle all exists spool acceleration and deceleration process, and opening and closing time is long；Especially under big flow rate working conditions, the adverse effect that spool opens and closes inertia force is more significantly, the most seriously constrains the lifting of printing effect.
2) reliability of valve-regulated injection increases with output flow and reduces, and flow enhancement runs into bottleneck.In the face of big flow 3D prints demand, owing to the aperture size of spool is limited, valve-regulated injection promotes flow usually through increasing valve core diameter, is but added significantly to weight and the inertia of spool.Under high velocity jet, the inertia impact of big quality spool forces output pressure and flow to fluctuate, and prints reliability and reduces the most rapidly.
3) easily there is micro-liquid drippage between twice injection, restrict letter quality.Completing once to spray, in time that secondary injection does not starts, the liquid in shower nozzle easily drips at Action of Gravity Field, and this has had a strong impact on the precision printed.Current valve-regulated injection (such as referenced patent WO058373A2) lacks the effective control to liquid drippage, it is suppressed that the further lifting of printing precision.
Summary of the invention
It is an object of the present invention to provide a kind of rotary digital valve being applicable to 3D print system, by the quick on-off of rotary valve body, it is achieved high frequency sound, the accurate drop injection of big flow, be particularly suited for the rapid shaping of large scale product.
Specific embodiments of the present invention are: a kind of 3D printing equipment with rotary digital valve, liquid feeding device is sprayed including 3D, the rotary digital valve being connected with feed arrangement outlet end, the printing head being connected with rotary digital valve discharging opening, the raw material cavity that can connect the conveying passage to form 3D injection liquid with printing head it is provided with in described rotary digital valve, described raw material cavity is also communicated with negative pressure line, described negative pressure line is connected with negative pressure device, when printing head stops material spray, negative pressure device controls to control raw material cavity through negative pressure line and forms negative pressure to prevent 3D injection liquid-liquid in printing head from dripping because of gravity.
Further, described rotary digital valve includes:
One valve body: offer the charging aperture connected with feed arrangement on the left of valve body, the discharging opening that the negative pressure mouth connected with negative tube on the right side of valve body connects with printing head；
One valve pocket: described valve is fixed in valve body, the body of described valve pocket is provided with the negative pressure hole that the charging hole connected with charging aperture connects and the discharge opening connected with discharging opening with negative pressure mouth；
One spool: described spool is fixed in valve body, described spool include being sheathed in a rotating shaft and with the left convex shoulder of rotating shaft synchronous rotary and right convex shoulder, described rotating shaft one end is connected with driving means through valve pocket with valve body, in described valve pocket, the space between left convex shoulder and right convex shoulder forms raw material cavity, described left convex shoulder and right convex shoulder form spring cavity with valve pocket two medial extremity respectively and control chamber, described control chamber controls to connect to drive left convex shoulder to slide axially along rotating shaft with right convex shoulder through magnetic valve with spring cavity, when left convex shoulder outer wall covers charging hole, raw material cavity is connected with negative pressure hole, when right convex shoulder outer wall covers negative pressure hole, left convex shoulder connects with raw material cavity.
Further, the left notch array of periodic distribution is had on described left shoulder surface, the right notch array of periodic distribution is had on right shoulder surface, any one plane with valve core axis as border described, only one of them intersects with left notch array and right notch array, so that when left notch is positioned at below charging hole, negative pressure hole and the dislocation of right notch, when right notch is positioned at below negative pressure hole, fuel feed hole misplaces with left notch.
Further, described left notch array is triangular groove array, described right notch array is also triangular groove array, described left notch is shaped as isosceles triangle with right notch, described charging hole and negative pressure hole cross section are rhombus, the interior acute angle of described charging hole is equal with left notch drift angle, and the interior acute angle of negative pressure hole is equal with right notch drift angle.
Further, the long-diagonal distance value of described rhombus charging aperture and spool at the maximum displacement moved right between charging hole outer dead centre and left notch array outer dead centre axial distance value equal；The long-diagonal distance value of negative pressure hole and spool at the maximum displacement being moved to the left between negative pressure hole outer dead centre and right notch outer dead centre axial distance value equal.
Further, described left convex shoulder deviates from the connection of right convex shoulder side the reference test bar through valve pocket and valve body, and described reference test bar is connected with displacement transducer.
Further, described left notch array and the triangular groove number of right notch array are 2 ~ 12, described charging hole and a length of 4 ~ 15mm of long-diagonal of negative pressure hole.
Further, described left convex shoulder is connected by spring towards left convex shoulder inwall with valve pocket.
Further, described feed arrangement includes the material cartridge being built-in with heater, and described material cartridge is connected with rotary digital valve by the road, and described pipeline is provided with filter, pump and check valve.
Further, described driving means is motor, and described rotating shaft uses spline or flat key to be connected with spool, and spool coordinates face to be provided with valve core seal ring with valve pocket.
Compared with prior art, the method have the advantages that
1) by arranging machinery PWM structure on spool convex shoulder, injection frequency that 3D print is greatly improved.On the radial circumference of spool convex shoulder, periodically have array notch arrangement；With the Spool rotating of driven by motor, the runner property performance period quick on-off that this structure and stationary valve put, the thus frequency of regulation output drop.Accelerate motor speed and increase notch number, all can promote rapidly injection frequency.
2) by rotary switch valve arrangement, the bottleneck that conventional spray mode flow is low is breached.This rotary digital valve utilizes Spool rotating to overcome the spool inertia problem of tradition valve-regulated (such as guiding valve, cone valve structure).Have Liquid output stream road on spool, in conjunction with spool High Rotation Speed by injection drop flow enhancement to more than 10L/min, be particularly suited for the rapid shaping of large scale product.
3) this device has linkage structure, can eliminate the phenomenon that between twice injection, liquid drips because of gravity, and 3D print quality is high.When completing once to spray, set negative pressure device works, the resorption a little of the liquid in nozzle, it is to avoid liquid drips because of gravity before spray next time, this negative pressure device is automatically switched off when second time injection starts, and thereby eliminates the liquid drippage problem having a strong impact on print quality.
Accompanying drawing explanation
Fig. 1 is the attachment structure schematic diagram that 3D based on the present invention prints spraying system.
Fig. 2 is the schematic diagram of digital valve internal structure of the present invention.
Fig. 3 is the schematic diagram of Fig. 2 C-C section of the present invention.
Fig. 4 is opened triangular groove and the location diagram of diamond hole on valve pocket on embodiment of the present invention spool.
Fig. 5 is the location diagram that embodiment of the present invention spool is in limit on the right-right-hand limit position spool triangular groove and diamond hole.
Fig. 6 is the location diagram that embodiment of the present invention spool is in limit on the left position spool triangular groove and diamond hole.
Fig. 7 characterizes triangular groove and the position relationship of diamond hole under valve core reset state.
Fig. 8 characterizes present invention operation principle schematic diagram in the state of a spray.
Fig. 9 characterizes present invention operation principle schematic diagram under resorption state.
In figure: 1, main material box, 2, heater, 3, pump, 4, overflow valve, 5, filter, 6, check valve, 7, rotary digital valve, 8, printing head, 9, negative pressure device, 9A, auxiliary material box, 9B, air cleaner, 10, first high-speed switch valve, 11, valve body, 12, valve pocket, 12A, left diamond hole, 12B, right diamond hole, 13, spool, 13A, left triangular groove array, 13B, right triangular groove array, 14, valve pocket end cap, 15, valve gap, 16, motor, 16A, motor output shaft, 17, valve core seal ring array, 18, control chamber, 19, second high-speed switch valve, 20, spring, 21, spring cavity, 22, displacement transducer, 22A, reference test bar.
Detailed description of the invention
The present invention will be further described in detail with detailed description of the invention below in conjunction with the accompanying drawings.
As it is shown in figure 1, Fig. 1 illustrates embodiment of the present invention has the rotary digital valve 7 overall structure in 3D prints spraying system.System puts into material in the main material box 1 have heater 2 heat so that it is meet injection conditions.When the left position of rotary digital valve 7 works, material through main material box 1, pump 3, filter 5, check valve 6, rotary digital valve 7, then ejects successively from printing head 8；Rotary digital valve 7 is the key element printing spraying system, realized in this spraying system course of work of output of discrete liquid by the rotation of spool 13, in order to avoid the weeping of liquid under Action of Gravity Field, rotary digital valve 7 connects and is communicated with negative pressure device 9 by the road, when stopping charging, printing head 8 is connected with negative pressure device 9, under suction function, fluent material in printing head 8 forms resorption state a little, it is to avoid the weeping of liquid under Action of Gravity Field.
Fig. 2 ~ 3 schematically illustrate the schematic diagram of rotary digital valve 7 structure of embodiment of the present invention.
Rotary digital valve includes valve body 11, valve pocket 12, spool 13 and displacement transducer 22；Wherein: it is internal that valve pocket 12 is arranged on valve body 11, it is internal that spool 13 is arranged on valve pocket 12, and displacement transducer 22 is arranged on valve body 11 end face；Rotary digital valve 7 is two-position three way structure, and three ports on valve body 11 connect fluid input port, printing head 8 and negative pressure device 9 respectively.Also the hole connected with three ports it is provided with, including the discharge opening (connecting with printing head 8) of charging hole (connecting with fluid input port), right side negative pressure hole (connecting with negative pressure device 9) and the lower section being positioned at left side in figure on valve pocket.
Spool 13 is driven by motor 16 and realizes rotating, the output shaft of described motor uses spline or flat key to be connected with spool, spool coordinates face to be sealed by valve core seal ring array 17 with valve pocket, spool 13 includes two the most left convex shoulders of part and right convex shoulder, the left notch array of periodic distribution is had on left shoulder surface, the right notch array of periodic distribution is had on right shoulder surface, any one plane with valve core axis as border described, only one of them intersects with left notch array and right notch array, so that when left notch is positioned at below charging hole, negative pressure hole misplaces with right notch, when right notch is positioned at below negative pressure hole, fuel feed hole misplaces with left notch.
The present invention devises spool and periodically has array notch arrangement and coordinate charging hole, the structure of negative pressure hole to realize the quick on-off of discharge opening.
In the present embodiment, the left triangular groove array 13A(the most left notch array of periodic distribution is had on left convex shoulder and right convex shoulder shoulder surface) and right triangular groove array 13B(the rightest notch array), valve pocket 12 inner surface corresponding thereto has the left i.e. charging hole of diamond hole 12A() and the right i.e. negative pressure hole of diamond hole 12B().
Left diamond hole 12A and right diamond hole 12B is rhombus, and left diamond hole 12A is consistent with the shape and structure of right diamond hole 12B.
The triangular groove of left triangular groove array 13A and right triangular groove array 13B is isosceles triangle, and left triangular groove array 13A is consistent with the triangular groove shape and structure of right triangular groove array 13B.
The interior sharp angle α 1 of left diamond hole 12A is equal with the triangular groove apex angle α 2 of left triangular groove array 13A, and the interior sharp angle α 3 of right diamond hole 12B is equal with the triangular groove apex angle α 4 of right triangular groove array 13B.The long-diagonal distance value of left diamond hole 12Ah2, and spool 13 axial distance value between left diamond hole 12A outer dead centre and left triangular groove array 13A outer dead centre at the maximum displacement moved righth1 is equal；The long-diagonal distance value of right diamond hole 12Bh4, and spool 13 axial distance value between right diamond hole 12B outer dead centre and right triangular groove array 13B outer dead centre at the maximum displacement being moved to the lefth3 is equal.
Displacement transducer 22 is connected with spool 13 by reference test bar 22A, the end face that spool 13 and reference test bar 22A connect, and forms the spring cavity 21 with ft connection with valve pocket 10 inner face, and the left convex shoulder of spring cavity 21 inner spool is connected by spring 20 with valve pocket 12；The control chamber 18 that the right convex shoulder of spool 13 outwards connects with formation between valve pocket end cap 14.
Fig. 4 ~ 6 represent when spool 13 is in diverse location, opened triangular groove and the location diagram of diamond hole on valve pocket.The left triangular groove array 13A opened on spool 13 and right triangular groove array 13B is the emphasis of rotary digital valve 7 design.In conjunction with Fig. 2, the convex shoulder corresponding to left triangular groove array 13A and right triangular groove array 13B is partially circumferentially launched；Simultaneously by playing the left diamond hole 12A of liquid inlet effect and connecting the right diamond hole 12B of negative pressure device 9, project to respectively in the expanded view of left triangular groove array 13A and right triangular groove array 13B.It should be noted that, when left diamond hole 12A connects with left triangular groove array 13A, right diamond hole 12B is off with right triangular groove array 13B, thus avoid the liquid from the input of P mouth directly to detach through negative pressure device 9 from B mouth, antisense is as the same.Upper left chamfered groove array 13A is identical with each triangular groove structure of right triangular groove array 13B.Simultaneously as the switching frequency of rotary digital valve 7 of the present invention, equal to the triangular groove number product of motor 16 rotating speed Yu left triangular groove array 13A, therefore increasing motor speed and triangular groove number, rotary digital valve 7 obtains high switching frequency.
For ease of analyzing, hereinafter the ratio of liquid output state Yu the non-output state of liquid is defined as " dutycycle ", this parameter and Spool rotating speed, determine speed and the frequency of injection.
As shown in Figure 4, left diamond hole 12A and right diamond hole 12B that valve pocket 12 is opened are diamond shaped, and the restriction loss of this structure is little.Diamond hole and the fit structure of triangular groove array, coordinate the area change gradient within the unit interval big than circular hole, and during "ON" "Off" transition, required time is short, energy loss is little.For accurately controlling dutycycle, as it is shown in figure 5, the interior sharp angle α 1 of left diamond hole 12A is equal with the triangular groove apex angle α 2 of left triangular groove array 13A, such as Fig. 6, the interior sharp angle α 3 of right diamond hole 12B is equal with the triangular groove apex angle α 4 of right triangular groove array 13B.Simultaneously, for realizing dutycycle wide variation between 0 ~ 100% of rotary digital valve 7, when spool 13 is in limit on the right-right-hand limit position, as shown in Figure 5, the triangular groove top of left triangular groove array 13A is to axial distance value h1 of the outer dead centre of left diamond hole 12A, with the long-diagonal of left diamond hole 12Ah2 is equal；When spool 13 is in limit on the left position, as shown in Figure 6, the triangular groove summit of right triangular groove array 13B is to the axial distance value of the outer dead centre of right diamond hole 12Bh3, with the long-diagonal of right diamond hole 12Bh4 is equal.
Fig. 7 characterizes triangular groove and the position relationship of diamond hole under valve core reset state.The limit on the right-right-hand limit position of the most left diamond hole 12A correspondence spool 13, with the rotation of spool, left diamond hole 12A does not connects with left triangular groove array 13A, and liquid does not inputs, and does not sprays, and machinery dutycycle is 0%.Meanwhile, right diamond hole 12B is positioned at the high order end of right triangular groove array 13B, is in connected state at spool 13 rotation status bottom right diamond hole 12B and right triangular groove array 13B, and the mechanical dutycycle i.e. communicated with negative pressure device 9 reaches as high as 100%.So when valve core reset works, in conjunction with Fig. 2, printing head 8 communicates with negative pressure device 9 all the time, thus avoid the weeping of printing head 5.
Fig. 8 ~ 9 characterize spray regime of the present invention and resorption operation schematic diagram.When being in spray regime, liquid is entered by the P mouth on valve body 11, and communicates with printing head 8 through A mouth, and now B mouth is closed, and is achieved in the injection of liquid.After completing once to spray, enter resorption state；Now, the P mouth of valve body 11 is closed, and printing head 8 is connected with negative pressure device 9 after A mouth and B mouth, the small size resorption of liquid in printing head 8, avoids liquid drip leakage with this, ready for spraying next time.
In the resorption state embodiment of Fig. 9, negative pressure device 9 is made up of the auxiliary material box 9A communicated with air and air cleaner 9B, and the liquid level in auxiliary material box 9A is less than the minimum level height in printing head 8, and the two liquid level difference ish.Utilize the first high-speed switch valve 10 to control to enter the liquid level of liquid in auxiliary material box 9A, be derived from meeting the resorption negative pressure value of different injection demand by adjusting liquid level difference.
The triangular groove number of left triangular groove array 13A and right triangular groove array 13B is 2 ~ 12, and left diamond hole 12A with the value of the long-diagonal h2 of right diamond hole 12B is: 4 ~ 15mm.
Control chamber to control to connect to drive left convex shoulder to slide axially along rotating shaft with right convex shoulder through magnetic valve with spring cavity, displacement transducer 22 monitors the displacement of spool 13 and in real time as actual spool 13 position feed back signal, and by spool 13 closed-loop control, improve spool 13 control accuracy.
The foregoing is only presently preferred embodiments of the present invention, all impartial changes done according to scope of the present invention patent and modification, all should belong to the covering scope of the present invention.
Claims (9)
1. a 3D printing equipment with rotary digital valve, it is characterized in that, liquid feeding device is sprayed including 3D, the rotary digital valve being connected with feed arrangement outlet end, the printing head being connected with rotary digital valve discharging opening, the raw material cavity that can connect the conveying passage to form 3D injection liquid with printing head it is provided with in described rotary digital valve, described raw material cavity is also communicated with negative pressure line, described negative pressure line is connected with negative pressure device, when printing head stops material spray, negative pressure device controls raw material cavity through negative pressure line and forms negative pressure to prevent 3D injection liquid in printing head from dripping because of gravity, described rotary digital valve includes:
One valve body: offer the charging aperture connected with feed arrangement on the left of valve body, the discharging opening that the negative pressure mouth connected with negative tube on the right side of valve body connects with printing head；
One valve pocket: described valve is fixed in valve body, the body of described valve pocket is provided with the negative pressure hole that the charging hole connected with charging aperture connects and the discharge opening connected with discharging opening with negative pressure mouth；
One spool: described spool is fixed in valve body, described spool include being sheathed in a rotating shaft and with the left convex shoulder of rotating shaft synchronous rotary and right convex shoulder, described rotating shaft one end is connected through valve pocket with driving means, in described valve pocket, the space between left convex shoulder and right convex shoulder forms raw material cavity, described left convex shoulder and right convex shoulder form spring cavity with valve pocket two medial extremity respectively and control chamber, described control chamber controls to connect to drive left convex shoulder to slide axially along rotating shaft with right convex shoulder through magnetic valve with spring cavity, when left convex shoulder outer wall covers charging hole, raw material cavity is connected with negative pressure hole, when right convex shoulder outer wall covers negative pressure hole, left convex shoulder connects with raw material cavity.
A kind of 3D printing equipment with rotary digital valve the most according to claim 1, the left notch array of periodic distribution is had on described left shoulder surface, the right notch array of periodic distribution is had on right shoulder surface, when charging hole intersects with left notch array, negative pressure hole is non-intersect with right notch array, when negative pressure hole intersects with right notch array, charging hole is non-intersect with left notch array, so that when left notch is positioned at below charging hole, negative pressure hole misplaces with right notch, when right notch is positioned at below negative pressure hole, charging hole misplaces with left notch.
A kind of 3D printing equipment with rotary digital valve the most according to claim 2, described left notch array is triangular groove array, described right notch array is also triangular groove array, described left notch is shaped as isosceles triangle with right notch, described charging hole and negative pressure hole cross section are rhombus, the interior acute angle of described charging hole is equal with left notch drift angle, and the interior acute angle of negative pressure hole is equal with right notch drift angle.
A kind of 3D printing equipment with rotary digital valve the most according to claim 3, the long-diagonal distance value of described rhombus charging aperture and spool at the maximum displacement moved right between charging hole outer dead centre and left notch array outer dead centre axial distance value equal；The long-diagonal distance value of negative pressure hole and spool at the maximum displacement being moved to the left between negative pressure hole outer dead centre and right notch outer dead centre axial distance value equal.
A kind of 3D printing equipment with rotary digital valve the most according to claim 1, described left convex shoulder deviates from the connection of right convex shoulder side the reference test bar through valve pocket and valve body, and described reference test bar is connected with displacement transducer.
A kind of 3D printing equipment with rotary digital valve the most according to claim 3, described left notch array and the triangular groove number of right notch array are 2～12, described charging hole and the long-diagonal a length of 4～15mm of negative pressure hole.
7., according to a kind of 3D printing equipment with rotary digital valve described in claim 1 or 6, described left convex shoulder is connected by spring towards left convex shoulder inwall with valve pocket.
8. according to a kind of 3D printing equipment with rotary digital valve described in claim 1, described feed arrangement includes the material cartridge being built-in with heater, described material cartridge is connected with rotary digital valve by the road, and described pipeline is provided with filter, pump and check valve.
A kind of 3D printing equipment with rotary digital valve the most according to claim 1, described driving means is motor, and described rotating shaft uses spline or flat key to be connected with spool, and spool coordinates face to be provided with valve core seal ring with valve pocket.
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| CN201410473585.9A CN104260350B (en) | 2014-09-17 | 2014-09-17 | A kind of 3D printing equipment with rotary digital valve |
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| CN201410473585.9A CN104260350B (en) | 2014-09-17 | 2014-09-17 | A kind of 3D printing equipment with rotary digital valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101692978B1 (en) * | 2015-04-09 | 2017-01-04 | 민치훈 | 3d printer that implements the fragrance material |
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| CN114889119A (en) * | 2022-05-30 | 2022-08-12 | 南京理工大学 | Single-channel multi-heating-module printing nozzle for granular materials |
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| CN101982315A (en) * | 2005-11-29 | 2011-03-02 | 精工爱普生株式会社 | Liquid ejector |
| CN101963166A (en) * | 2010-10-22 | 2011-02-02 | 浙江工业大学 | Dual-mode electric digital valve |
| CN103231514B (en) * | 2013-04-01 | 2015-03-18 | 杭州笔水画王电子科技有限公司 | 3d printer |
| CN203543366U (en) * | 2013-11-01 | 2014-04-16 | 武汉璟丰科技有限公司 | Printer negative pressure control system |
| CN103878979B (en) * | 2014-03-13 | 2017-02-01 | 珠海天威飞马打印耗材有限公司 | printing head and three-dimensional printer |
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| KR101692978B1 (en) * | 2015-04-09 | 2017-01-04 | 민치훈 | 3d printer that implements the fragrance material |
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