KR102084892B1 - Powder feeding device and 3D printer having the same - Google Patents

Abstract

The present invention relates to a powder supply device for a 3D printer and a 3D printer having the same. A double powder supply device includes a moving support (410) supported by first and second LM guides (120 and 130) to be movable; a hopper (420) filled with powder and installed on an upper side of the moving support (410); first and second feeder motors (430 and 440) installed on one side of the moving support (410); a powder discharge unit (450) installed on a lower side of the moving support (410), wherein the powder discharge unit (450) is driven by the first feeder motor (430) to discharge powder filled in the hopper (420) in a wide width, thereby forming a powder layer (L); and a flat pressing unit (460) installed on an opposite low side of the moving support (410) and driven by the second feeder motor (440) to flat press the powder discharged to a stage plate (210).

Description

Powder feeding device for 3D printers and 3D printer having the same {Powder feeding device and 3D printer having the same}

The present invention relates to a powder supply device for a 3D printer and a 3D printer having the same, and more specifically, a powder supply device for a 3D printer and a 3D printer having the same, which are capable of manufacturing a three-dimensional object of a large size using powder and a binder. It is about.

In general, a 3D printer is a printer that creates an article like printing in a 3D space based on a 3D drawing. 3D printers were used for limited use using plastic materials in the early stages of development, but recently, powders such as metal, ceramic, and nylon have been used as materials to develop a situation where they can be applied in various industries including cases and various automobile parts. .

For reference, the 3D printing method includes a BPM (Ballistic Particle Manufacturing) method using an ink jet printer technology, and a SLA (Stereo Lithographic Apparatus) method using a principle in which a scanned portion is cured by laser scanning a photocurable resin. , SLS (Selective Laser Sintering) method using the principle of using a functional polymer or metal powder in place of the photocurable resin in SLA and sintering by scanning laser beam, using laser beam as the desired cross section of the paper coated with adhesive There are various methods such as a laminated object manufacturing (LOM) method of cutting and laminating one by one.

However, since the printing method is small enough to have only 10 to 20 cm in width, height, and height of the printed object to be output, a printing method different from the conventional method is required to output a large sized object.

In addition, a technique for forming a powder layer having a large area to output a large-sized sculpture and also to pressurize the powder layer (L) at an even pressure was required.

The present invention was created to meet the above needs, and an object of the present invention is to provide a powder supply device for a 3D printer and a 3D printer having the same, which can output a three-dimensional sculpture of a large size.

Another object of the present invention is to provide a powder supply device for a 3D printer and a 3D printer having the same, which can form a powder layer having a large area and pressurize the formed powder layer with an even pressure.

In order to achieve the above object, the powder supply device for a 3D printer according to the present invention includes: a moving support 410 supported by the first and second LM guides 120 and 130; A hopper 420 installed on the upper side of the moving support 410 as being filled with powder; First and second feeder motors 430 and 440 installed on one side of the moving support 410; It is installed on the lower side of the moving support 410, driven by the first feeder motor 430, the powder filled in the hopper 420 is discharged to the stage plate 210 in a wide width to form a powder layer (L ) To form a powder discharge portion 450; And a flat pressing unit 460 which is installed on the lower other side of the moving support 410 and is driven by the second feeder motor 440 to flat press the powder discharged to the stage plate 210. and; The powder discharge part 450 is fixed to a lower one side of the moving support 410, and a feeder box 451 formed with a box discharge groove 451a long toward the lower side and an upper side of the box discharge groove 451a. The first fixed amount discharge roller 452 formed on the outer circumferential surface with a plurality of first fixed amount grooves 452a symmetrically installed as being rotatably installed in the longitudinal direction, and rotatably installed on the lower side of the box discharge groove 451a. The second fixed amount discharge roller 453 formed on the outer circumferential surface of the plurality of second fixed grooves 453a symmetrically in the longitudinal direction, and the first fixed amount discharge roller 452 is axially coupled to the outside of the feeder box 451 The first drive shaft 456 to which the rotational driving force is transmitted from the first feeder motor 430 and the rotational driving force transmitted to the first constant dispensing roller 452 are extended as the second constant dispensing roller 453. It includes a gear assembly (457) for gear coupling the first and second fixed-rate discharge rollers (452, 453) to be delivered to; The volume of the first metering groove 452a formed on the outer circumferential surface of the first metering discharge roller 452 has a larger volume than the second metering groove 453a formed on the outer peripheral surface of the second metering discharge roller 453; A plurality of first crushing grooves 452b having opposite corners at the inlet side are formed between the plurality of first constant grooves 452a formed on the outer circumferential surface of the first constant discharge roller 452; It characterized in that the plurality of second crushing grooves (453b) having a right angle at both sides of the inlet is formed between the plurality of second metering grooves (453a) formed on the outer circumferential surface of the second metering discharge roller (453); .

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In the present invention, the flat pressing portion 460, between a pair of bracket wings (461) (461 ') fixed to the lower other side of the moving support 410, and the bracket wings (461) (461') A flat pressing roller 462 rotatably installed in the shaft drive shaft axially coupled to the flat pressing roller 462 to extend outwardly from the bracket feeder 461 to transmit rotational driving force from the second feeder motor 440 It includes a second drive shaft (463).

In the present invention, a pair of height adjustment unit 470 installed between the moving support 410 and the flat pressing unit 460 to adjust the height of the flat pressing unit 460 based on the moving support 410 Further comprising; The height adjustment unit 470 is fixed to the top of each of the bracket blades 461 and 461 ', and the lifting support rod 471 through which the moving support 410 is slidably slidable in the vertical direction, and the moving An adjustment bolt 472 screwed to penetrate the moving support 410 at an upper side of the support 410 to be in close contact with the center of the bracket wing 461, and a handle 473 installed on the adjustment bolt 472 ).

In order to achieve the above object, the 3D printer according to the present invention is installed on a frame (F) supported on the ground, the first and second LM guides 120 located on both sides of the space 110 opened upward ) 130 with a table 100; When coupled to the frame (F) as being in close contact with the edge of the space 110, the process box 200 having a stage plate 210 is carried out the output process of the sculpture while being elevated; An elevation operation unit 300 installed on the frame F to elevate the stage plate 210; As a reciprocating transport along the first and second LM guides 120 and 130, a powder supply device 400 for supplying powder for output of the sculpture to the stage plate 210 to form a flat powder layer (L) 400 )Wow; A transfer LM guide 500 installed across the first and second LM guides 120 and 130 and reciprocating along the first and second LM guides 120 and 130; It includes a printing unit 600 having a printer head 630 forming a binder pattern B of a specific shape by spraying the binder as being reciprocated on the transfer LM guide 500; including, and the powder supply device 400, the first and second LM guides 120, 130 and a movable support 410 that is supported to be movable; A hopper 420 installed on the upper side of the moving support 410 as being filled with powder; First and second feeder motors 430 and 440 installed on one side of the moving support 410; It is installed on the lower side of the moving support 410, driven by the first feeder motor 430, the powder filled in the hopper 420 is discharged to the stage plate 210 in a wide width to form a powder layer (L ) To form a powder discharge part (450); It is installed on the other side of the lower side of the moving support 410, a flat pressing unit 460 driven by the second feeder motor 440 to pressurize the powder discharged to the stage plate 210; ; The powder discharge part 450 is fixed to a lower one side of the moving support 410, and a feeder box 451 formed with a box discharge groove 451a long toward the lower side and an upper side of the box discharge groove 451a. The first fixed amount discharge roller 452 formed on the outer circumferential surface with a plurality of first fixed amount grooves 452a symmetrically installed as being rotatably installed in the longitudinal direction, and rotatably installed on the lower side of the box discharge groove 451a. The second fixed amount discharge roller 453 formed on the outer circumferential surface with a plurality of second fixed amount grooves 453a symmetrically in the longitudinal direction, and the first fixed amount discharge roller 452 is axially coupled to the outside of the feeder box 451 The first drive shaft 456 to which the rotational driving force is transmitted from the first feeder motor 430 and the rotational driving force transmitted to the first constant dispensing roller 452 are extended as the second constant dispensing roller 453. It includes a gear assembly (457) for gear coupling the first and second fixed-rate discharge rollers (452, 453) to be delivered to; The volume of the first metering groove 452a formed on the outer circumferential surface of the first metering discharge roller 452 has a larger volume than the second metering groove 453a formed on the outer peripheral surface of the second metering discharge roller 453; A plurality of first crushing grooves 452b having opposite corners at the inlet side are formed between the plurality of first constant grooves 452a formed on the outer circumferential surface of the first constant discharge roller 452; It characterized in that the plurality of second crushing grooves (453b) having a right angle at both sides of the inlet is formed between the plurality of second metering grooves (453a) formed on the outer circumferential surface of the second metering discharge roller (453); .

In the present invention, the powder discharge part 450 is fixed to one lower side of the moving support 410, the feeder box 451 having a long box discharge groove 451a formed on the lower side, and the box discharge groove ( 451a) is installed rotatably on the upper side of the first fixed amount discharge roller 452 in which a plurality of first fixed amount grooves 452a are formed in the longitudinal direction, and rotatable on the lower side of the box discharge groove 451a The second fixed quantity discharge roller 453 in which a plurality of second fixed quantity grooves 453a are formed in the length direction as being installed, and the first fixed quantity discharge roller 452 is axially coupled to extend outside the feeder box 451 As the first drive shaft 456 to which the rotational driving force is transmitted from the first feeder motor 430 and the rotational driving force transmitted to the first constant amount discharge roller 452 are transmitted to the second constant amount discharge roller 453. It includes a gear assembly (457) for gear coupling the first and second constant discharge rollers (452, 453).

According to the present invention, the powder supply device that is reciprocated along the first and second LM guides forms a large area powder layer (L) on the stage plate, and is printed flatly along the first and second LM guides and the conveying LM guide. The blowing operation part is printed while the binder layer (B) is cured by printing a specific pattern of the binder pattern (B) on the powder layer (L), and the powder layer and the binder pattern forming operation are repeated. By gradually descending the stage plate, it is possible to output a sculpture having a large size while having a three-dimensional shape in the process box.

In addition, the amount of powder discharged from the powder supply device and the amount of binder injected from the printing portion are varied, and the distance of the stage plate descending in the process of forming the powder layer (L) and the binder pattern (B) by the moving operation portion is variable. By doing so, the quality and output speed of the sculpture can be varied.

And the powder supply device has the effect of forming a large area of the powder layer (L) on the stage plate, and pressing the formed powder layer (L) at an even pressure, thereby realizing the output of a large-sized and high-quality molding.

1 is a perspective view of a powder type 3D printer according to the present invention,
Figure 2 is a plan view of the powder type 3D printer of Figure 1,
Figure 3 is a front view of the powder type 3D printer of Figure 1,
Figure 4 is a front view showing the excerpt of the process box of Figure 1,
5 is a cross-sectional view of the process box of FIG. 4 taken along line V-V ',
Figure 6 is a perspective view showing an excerpt of the lifting operation for lifting the stage plate and the bottom plate of Figure 5,
Figure 7 is a side view of the lifting operation of Figure 6,
8 is a view for explaining that the locking wings of FIGS. 6 and 7 are coupled to the locking block of the process box;
9 is a perspective view showing an excerpt of the powder supply device of FIG. 1,
10 is a plan view of the powder supply device of Figure 9,
11 is a cross-sectional view of the powder supply device of FIG. 9 taken along line XI-XI ',
12 is a perspective view of the powder supply device of FIG. 9 cut obliquely;
13 is a perspective view showing an excerpt of the powder supply device of FIGS. 11 and 12,
14 is a cross-sectional view of the powder supply device of FIG. 13 taken along line XIV-XIV ',
15 is a perspective view showing an excerpt of the printing unit of FIG. 1,
16 is a view for explaining that the first and second printer heads of FIG. 15 are alternately installed on the horizontal bracket;
17 is a view for explaining the configuration of the powder discharge unit of FIG. 1,
18 is a perspective view showing an excerpt of the cleaning kit of FIG. 1,
FIG. 19 is a perspective view showing an extraction kit of the cleaning solution of FIG. 1,
20 is a cross-sectional view of the cleaning liquid application kit of FIG. 19 taken along line XX-XX '.
21 is a view for explaining that the three-dimensional molding is output by the powder supply device and the printing unit of FIG.

Hereinafter, a powder supply device for a 3D printer according to the present invention and a 3D printer having the same will be described in detail with reference to the accompanying drawings.

Hereinafter, what is described as "upper" or "upper" may include not only that which is directly above in contact, but also that which is above in a non-contact manner. Terms such as first and second may be used to describe various components, but components should not be limited by terms. The terms are only used to distinguish one component from other components. Singular expressions include plural expressions unless the context clearly indicates otherwise. Also, when a part “includes” a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise specified. In addition, terms such as “…… .part” and “module” described in the specification mean a unit that processes at least one function or operation. In addition, in the drawings, the size of components may be exaggerated or reduced for convenience of description. For example, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to what is shown.

1 is a perspective view of a powder type 3D printer according to the present invention, FIG. 2 is a plan view of the powder type 3D printer of FIG. 1, and FIG. 3 is a front view of the powder type 3D printer of FIG. 1.

As shown, the powder type 3D printer according to the present invention is installed on the frame F supported on the ground, and the first, 2LM guides 120 located on both sides of the space 110 opened upward (( A table 100 having 130); A process box 200 having a stage plate 210 on which the output process of the sculpture is carried out while being elevated and being in close contact with the edge of the space 110 when coupled to the frame F; An elevation operation unit 300 installed on the frame F to elevate the stage plate 210; As a reciprocating transport along the first and second LM guides 120 and 130, the powder supply device 400 for supplying powder for output of the sculpture to the stage plate 210 to form a flat powder layer (L) Wow; The first and second LM guides 120 and 130 are installed across the first and second LM guides 120 and 130, and the transfer LM guides 500 are reciprocated and transferred along the first and second LM guides 120 and 130; As a reciprocating transfer on the transfer LM guide 500, a printing unit 600 having a printer head 630 to form a binder pattern (B) of a specific shape by spraying a binder on the powder layer (L); The first and second LM guides 120 and 130 are installed on the front and rear tables 100 of the space 110 in a direction perpendicular to the first and second LM guide boxes to recover unused powder in the process of printing the sculpture ( 710) a powder recovery unit 700 having 720; A cleaning kit 800 for cleaning the powder attached to the printer head 630 while forming the binder pattern B; It characterized in that it comprises; a cleaning kit 800, a cleaning liquid application kit 900 for applying a cleaning liquid to the print head 630 to effectively clean the powder.

The table 100 is supported by a three-dimensional frame F seated on the ground, and a space 110 communicating with the frame F is formed on the upper side. In addition, the first and second LM guides 120 and 130 are installed on both sides of the space 110, and the transfer LM guide 500 indirectly supporting the powder supply device 400 and the printing part 600, which will be described later, is moved forward and backward. Support for transport.

The transfer LM guide 500 is supported across the first and second LM guides 120 and 130, and is reciprocated along the first and second LM guides 120 and 130, and the printing part 600 is transferred to the upper side. It is supported so that it can be transferred in the left-right direction. Accordingly, the printing unit 600 can be transferred to a special position on the table 100 by the organic operation relationship of the transfer LM guide 500 and the first and second LM guides 120 and 130.

FIG. 4 is a front view excerpting the process box of FIG. 1, and FIG. 5 is a cross-sectional view of the process box of FIG. 4 taken along line V-V '.

As illustrated, the process box 200 has a box shape opened upward, and is coupled to the frame F in a drawer-type manner, discharged or immersed in the front side of the frame F (see FIG. 1), and the frame F It is in close contact with the edge of the space 110 in a state immersed inward. The process box 200 includes a box body 220 incorporating a stage plate 210 in which the output process of the sculpture is performed, and a stage plate 210 inside the box body 220 so as to be elevated and lowered. The bottom plate 230 and the pair of locking blocks 240 and the pair of locking blocks 240 having a stepped side 241 whose facing surface is narrowed as being located on the lower side of the bottom plate 230, A plurality of positioning pins 250 fastened to the bottom plate 230 and installed between the pin head 251 and the locking block 240 of the positioning pin 250, the locking block 240 is the bottom plate It includes a spring (260) for applying the elastic force in close contact with the (230).

The box body 220 has a rim shape as a whole, and the stage plate 210 and the butter plate 230 that are elevated inside are accommodated. In this embodiment, the box body 220 has a large size of 50 cm in width, 70 cm in length, and 40 cm in depth.

The stage plate 210 provides a space in which the output process of the sculpture is performed, and the powder layer (L) is formed by the powder supplied from the powder supply device 400, and the binder supplied from the printing unit 600 The process of forming the powder layer (L) binder pattern (B) is repeatedly performed alternately. At this time, the binder pattern (B) formed between the powder layers (L) to be laminated is to solidify the powder layer to eventually become a three-dimensional molding.

The stage plate 210, each time the binder pattern (B) is formed on the powder layer (L), the set distance by the lifting operation unit 300, 0.1mm in this embodiment, descends by the binder pattern ( In proportion to the number of times the powder layer (L) on which B) is formed is stacked, the size of the completed three-dimensional modeling material is changed.

The stage plate 210 is initially raised by a space 110 and a flat height, and the powder layer L and the binder pattern B alternately by the powder supply device 400 and the printing unit 600. As it is stacked, it descends in 0.1 mm increments, and later, a large amount of powder is accumulated inside the box body 220. In order to prevent such powder from escaping through the bottom of the box body 220, a sealing border 211 is installed at the bottom edge of the stage plate 210 in close contact with the inner circumferential surface of the box body 220. The sealing border 211 is made of an elastic material, for example, silicone rubber.

5, the bottom plate 230 is positioned on the bottom side of the stage plate 210 to prevent the flatness of the stage plate 210 from being deformed.

Since the present invention is to output a large-sized sculpture, 300 to 500 kg of powder load is applied to the stage plate 210 in which powder is laminated inside the box body 220, and the powder load is applied to the stage plate 210. The overall shape, such as flatness, can be transformed. In this state, the moldings output by the powder layer (L) and the binder pattern (B) that are alternately stacked on the stage plate (210) have a significantly weak strength in a specific portion, and thus a low-quality molding is made. .

In the present invention, by employing a separate bottom plate 230 supporting the lower side of the stage plate 210, it is possible to prevent the deformation of the stage plate 210 even if an excessive powder load is applied.

The pair of locking blocks 240 are fixed to the bottom plate 230 by a plurality of positioning pins 250, as shown in FIGS. 4 and 8, locking of the lifting operation unit 300 to be described later Wings 340 has a structure in which a stepped 241 is selectively coupled.

Positioning pin 250, as shown in Figure 5, by passing through a pair of locking blocks 240 and fastened to the bottom plate 230, the pair of locking blocks 240 are downward from the bottom plate 230 Fix the position so as not to be separated while enabling a little movement.

Spring 260, as shown in Figure 5, is installed between the pin head 251 of the positioning pin 250 and the locking block 240, the pair of locking blocks 240, the bottom plate 230 Elastic force is applied so as to adhere to the. That is, the spring 260, the usual locking block 240 is elastically in close contact with the bottom plate 230, when the locking blade 340, which will be described later, is fitted to the stepped 241 of the locking block, it is slightly pushed to the lower side. While allowing the locking wing 340 to be firmly coupled to the locking block 240.

By employing such a process box 200, it is possible to output a large-sized sculpture, and at the same time, it is possible to maintain a rugged durability even under an excessive powder load, and the unused powder can be recovered.

FIG. 6 is a perspective view showing an elevation operation part for elevating the stage plate and the bottom plate of FIG. 5, FIG. 7 is a side view of the elevation operation part of FIG. 6, and FIG. 8 is a locking box of FIGS. 6 and 7 It is a view for explaining what is coupled to the locking block of the.

The lifting operation unit 300 is installed inside the frame F to elevate the stage plate 210 inside the process box 200. The lifting operation unit 300 includes a base 310 fixed to the frame F, a cylinder 320 installed on the lower side of the base 310, and a cylinder rod moving up and down from the cylinder 320 ( 321) as being supported by the locking blade 340 selectively coupled to the stepped 241 of the locking block 240 and the guide flange 311 of the base 310 slidably coupled to the locking blade ( 340) a plurality of guide shafts 350 fixed to the bottom of the locking blades 340 and the locking blades 340 are installed on the base 310 on both sides of the locking blades 340 so that they can be raised and lowered by sliding the box body 220 It is installed on a pair of slider rails 360 that are possibly supported, and a rail stepped 361 protruding upward from the tip of the slider rail 360, and is in close contact with the front end of the box body 220, and the box body 220 It includes a stopper 370 to stop the movement, and a locking lever 380 installed at the rear end of the slider rail 360 to position the rear end of the box body 220 in close contact with the stopper 370.

The cylinder 320 is a digital cylinder incorporating a servo motor so that the locking blade 340 can be lowered in units of a set distance, in this embodiment 0.1 mm distance.

The locking wing 340 is a pair of locking blocks when the process box 200 enters the inside of the frame F along the slider rail 360 while the stage plate 210 is located on the bottom of the box body 220. It is fitted to the stepped (241) formed in (240). Therefore, when the cylinder 320, the locking wing 340 is raised or lowered, the locking wing 340 may forcibly raise or lower the stage plate 210.

The guide shaft 350 supports the locking blade 340 to be elevated and lifted in a horizontal state even when an excessive load is applied to the locking blade 340.

For reference, in this embodiment, the weight of the box body 220 is 100 kg, and when the box body 220 is filled with powder, the weight of the powder reaches 300-500 Kg, and accordingly, the locking wing 340 has a total weight. A load of 500 Kg or more is applied. Accordingly, a situation in which an excessive load is applied to the locking blade 340 and inclined to one side may occur. In the present invention, the locking blade 340 is horizontally supported by adopting the guide shaft 350. can do.

The slider rail 360 is slidably supporting the bottom of the box body 220 that enters and exits the inside of the frame F, and for this purpose, a plurality of rollers 362 in close contact with the bottom of the box body 220 is installed. Have At this time, the number of the rollers 362 depends on the load of the box body 220 to be applied.

The stopper 370 and the locking lever 380 fix the position so that the box body 220 seated on the slider rail 360 does not move.

By this structure. As shown in FIG. 8, when the process box 200 enters inside the frame F along the slider rail 360, the pair of steppeds 241 enter while enclosing the locking blades 340. .

When the process box 200 completely enters the frame F, the box body 220 is in close contact with the edge of the space 110, and then the stage plate 210 has been completely raised by the lifting operation unit 300. At this time, the surfaces of the stage plate 210 and the table 100 are flattened so that the output process can be started.

FIG. 9 is a perspective view showing the powder supply device of FIG. 1, FIG. 10 is a plan view of the powder supply device of FIG. 9, and FIG. 11 is a cross-sectional view of the powder supply device of FIG. 9 taken along line XI-XI ' 12 is a perspective view showing the powder supply device of FIG. 9 at an angle, and FIG. 13 is a perspective view showing excerpts of the powder supply devices of FIGS. 11 and 12, and FIG. 14 is a powder supply device of FIG. Is a cross-sectional view taken along line XIV-XIV '.

The powder supply device 400 includes a moving support 410 supported by the first and second LM guides 120 and 130 to be movable; A hopper 420 installed on the upper side of the moving support 410 as being filled with powder; First and second feeder motors 430 and 440 installed on one side of the moving support 410; It is installed on the lower side of the moving support 410 and is driven by the first feeder motor 430 to discharge the powder filled in the hopper 420 to the stage plate 210 in a wide width to form a powder layer (L). A powder discharge part 450 to be made; A flat pressing unit 460 which is installed on the other lower side of the moving support 410 and is driven by the second feeder motor 440 to flat press the powder discharged to the stage plate 210; It is installed between the moving support 410 and the flat pressing unit 460, a pair of height adjusting unit 470 for adjusting the height of the flat pressing unit based on the moving support 410; includes.

The first and second feeder motors 430 and 440 are step motors capable of finely controlling the rotational speed, and the first and second driving pulleys 431 and 441 are axially coupled to each rotational shaft.

11 and 12, the powder discharge part 450 is fixed to one lower side of the moving support 410, and a feeder box 451 with a box discharge groove 451a formed at a lower side and a box It is installed rotatably on the upper side of the discharge groove (451a), a plurality of in the longitudinal direction, in the present embodiment, the first constant discharge roller 452 formed with four first constant grooves 452a and the box discharge groove ( 451a) as being rotatably installed on the lower side, a plurality in the longitudinal direction, in this embodiment, the second constant dispensing roller 453 having four second constant grooves 453a, and both sides of the feeder box 451 First and second bearing holders 454 and 455 rotatably supporting both ends of the first and second fixed quantity discharge rollers 452 and 453, and the first fixed quantity discharge rollers 452 are axially coupled to a feeder box (451) The first drive shaft 456 to which the rotational driving force is transmitted from the first feeder motor 430 as extending outwardly, and the rotational driving force transmitted to the first constant discharge roller 452 are the second constant discharge roller ( It includes a gear assembly (457) for gear coupling the first and second fixed-rate dispensing rollers (452, 453) to be transmitted to (453).

A box circumferential groove 451b having an inner circumferential curved surface opposite to the outer circumferential curved surfaces of the first and second constant discharge rollers 452 and 453 is formed on the inner circumferential surface of the box discharge groove 451a inside the feeder box 451. The box circumferential groove 451b wraps a portion of the outer circumferential surfaces of both sides of the first and second fixed quantity discharge rollers 452 and 453, so that the powder supplied from the hopper 420 is the first and second fixed quantity discharge rollers 452 and 453. When passing through the first and second fixed grooves 452a and 453a, the flow path is restricted.

The first metering discharge roller 452 has an elongated cylindrical shape, and a first metering groove 452a is formed on the outer circumferential surface.

The second metering discharge roller 453 has an elongated cylindrical shape, and a second metering groove 453a is formed on the outer circumferential surface.

The volume of the first metering groove 452a formed in the first metering discharge roller 452 is larger than the second metering groove 453a formed in the second metering discharge roller 453, as shown in FIG. The amount of powder accommodated by the first metering groove 452a is greater than the amount of powder accommodated by the second metering groove 453a. That is, the amount of powder discharged through the second fixed amount discharge roller 453 is larger than the amount of powder discharged through the first fixed amount discharge roller 452. Accordingly, while the first constant discharge roller 452 discharges the powder, the second constant discharge roller 453 can implement an operation mechanism capable of continuously discharging the powder.

If the volume of the first metering groove 452a and the second metering groove 453a is the same, or the volume of the second metering groove 453a is larger than the volume of the first metering hole 452a, the second metering discharge is performed. A case in which the amount of powder discharged by the roller 453 becomes larger than the amount of powder supplied by the first fixed amount discharge roller 452 may occur, in this case, the first fixed amount discharge roller 452 and the second fixed amount discharge roller ( 453) by forming an empty space therebetween, the powder supplied from the powder discharge unit 450 may not be continuous, and thus the molding may be defective.

On the other hand, a first crushing groove 452b is formed between a plurality of first sizing grooves 452a in the first constant dispensing roller 452, and a plurality of second constant grooves in the second constant dispensing roller 453. A second crushing groove 453b is formed between 453a, and the first and second crushing grooves 452b and 453b have a right-angled cross section. The first and second crushing grooves 452b and 453b are high due to humidity or other causes, and when the powder supplied through the hopper 420 has a lump form, the crushed powder is crushed to form the first and second doses. The discharge rollers 452 and 453 allow the powder to be dispensed in the correct amount.

The first drive shaft 456 is axially coupled with the first constant discharge roller 452, as shown in FIG. 14, and the first drive shaft 456 has a first drive pulley 431 of the first feeder motor 430. ) And the first driven pulley 456a connected by a belt are coupled. Accordingly, the rotational force transmitted to the first driven pulley 456a by the first driving pulley 431 rotates the first constant discharge roller 452, and also the first constant discharge roller 452 and the gear assembly 457. Rotates the second constant-rate dispensing roller 453 connected to.

With this structure, the number of revolutions of the first and second fixed quantity dispensing rollers 452 and 453 can be increased or decreased by the driving of the first feeder motor 430, thereby controlling the amount of powder discharged quantitatively. can do.

The flat pressing unit 460 pressurizes the powder discharged to the stage plate 210 by the powder discharge unit 450. The flat pressing part 460 is a flat that is rotatably installed between a pair of bracket wings 461 (461 ') and the bracket wings 461 (461') that are fixed to the lower other side of the moving support 410. It includes a pressing roller 462 and a second driving shaft 463 which is axially coupled to the flat pressing roller 462 and extends outward of the bracket wing 461 and transmits rotational driving force from the second feeder motor 440.

9, the second drive shaft 463 is axially coupled with the flat pressing roller 462, and the second drive shaft 463 has a second drive pulley 441 of the second feeder motor 440. The second driven pulley 463a connected to the belt is coupled. Accordingly, the rotational force transmitted to the second driven pulley 463a by the second driving pulley 441 rotates the flat pressing roller 462.

With this structure, the flat pressing roller 462 can be rotated in the same direction as the moving direction of the powder discharge unit 450 by driving the second feeder motor 440, and accordingly, the powder discharge unit 450 The powder layer (L) formed while moving can be evenly pressed.

The height adjustment unit 470 varies the height of the flat pressing unit 460 based on the moving support 410 and, strictly, the height of the flat pressing roller 462 in order to vary the pressing degree of the powder layer L. do. The height adjustment unit 470 is fixed to the upper end of each bracket wing 461 and 461 ', and the lifting support rod 471 through which the moving support 410 is slidable in the vertical direction, and the moving support 410 ) And an adjustment bolt 472 that is screwed to penetrate the moving support 410 at the upper side of the bracket and is in close contact with the center of the bracket wing 461. It includes a handle 473 installed on the adjustment bolt 472. At this time, a spring 474 is installed on the lifting support rod 471 so that the bracket wings 461 and 461 'are always elastically biased downward.

By this structure, the height of the bracket wings 461 and 461 'can be adjusted based on the moving support 410 by rotating the handle 473 forward and backward, and accordingly, the bracket wings 461 and 461' The degree of pressure of the flat pressing roller 462 supported on the powder layer L may be varied.

In this way, by the powder supply device 400, it is possible to form a large area of the powder layer (L) on the stage plate 210 to output a large-sized sculpture, and also pressurize the powder layer (L) at an even pressure. You can do it.

FIG. 15 is a perspective view showing an excerpt of the printing unit of FIG. 1, and FIG. 16 is a view for explaining that the first and second printer heads of FIG. 15 are alternately installed on the horizontal bracket.

The printing part 600 is composed of a vertical bracket 611 supported to be reciprocated along the transport LM guide 500 and a horizontal bracket 612 connected to the vertical bracket 611 and facing the table 100. The transfer bracket 610, which is supported by the vertical bracket 611, is a binder storage tank 620 in which a binder to be injected into the powder layer L formed on the stage plate 210 is accommodated, and a horizontal bracket 612. A printer head 630 that is supported, a head block 640 that fixes the print head 630 to the horizontal bracket 612, and a syringe that supplies the binder stored in the binder storage tank 620 to the print head 630 650.

The printer head 630 is composed of a first printer head 631 and a second printer head 632, and the first and second printer heads 631 and 632 are based on the front of the printing direction of the printing unit 600. ), The first and second printing nozzles 631a and 632a are connected to each other, as shown in FIG. 16, the first and second printing heads 631 and 632 are alternately arranged. Accordingly, the first and second printing nozzles 631a and 632a may form a long width as a result, and the binder may be sprayed.

Since the first printing nozzle 631a is formed on the bottom of the first printing head 631, and the second printing nozzle 632a is formed on the bottom of the second printing head 632, the first and second printing nozzles ( The length (a) (b) of 631a) (632a) is shorter than the length of the first and second printer heads 631 (632). Therefore, when simply connecting the first printer head 631 and the second printer head 632 for a long time, since the gap is formed between the first printing nozzle 631a and the second printing nozzle 632a, the first and second printing nozzles are formed. When the binder is jetted at (631a) (632a), a space that is not printed is inevitably formed. To prevent this, the first printer head 631 and the second printer head 632 are alternately arranged so that the first and second printing nozzles 631a and 632a are connected based on the front of the transfer direction. will be.

As illustrated in FIG. 16, the first printing nozzle 631a is implemented by having a plurality of nozzle ejection holes formed in a line at the bottom of the first printer head 631, and the second printing nozzle 632a is a plurality of nozzles. The injection port is implemented by being formed in a long line in the bottom of the second printer head 632. Accordingly, the first printer head 631 for spraying the binder with a large width through a plurality of nozzle ejection openings, and the second printer head 632 for ejecting the binder with a large width through the multiple nozzle injection openings operate simultaneously, The binder pattern (B) forming a large area on the powder layer (L) can be quickly printed.

The head block 640 is an intermediary member that enables the printer head 630 to be easily replaced with the horizontal bracket 612. The head block 640 includes first and second head blocks 641 and 642 so that the first and second printer heads 631 and 632 can be fixed to the horizontal bracket 612.

The syringe 650 is composed of first and second syringes 651 and 652 to independently supply a binder from the binder storage tank 620 to each of the first and second printer heads 631 and 632. .

With this structure, a binder can be sprayed to have a specific pattern on the powder layer (L) formed on the stage plate (210), and the binder pattern (B) formed thereby has the same powder layer (B). It solidifies into a form.

17 is a view for explaining the configuration of the powder discharge unit of FIG.

The powder recovery unit 700 is formed on the table 100 on both sides of the space 110 in a direction perpendicular to the first and second LM guides 120 and 130, and recovers unused powder in the process of outputting the sculpture. The powder recovery unit 700 includes the first and second powder recovery boxes 710 and 720, and the first and second powder recovery boxes 710 and 720 formed on the table 110 in the front and rear of the space 110. It includes a connected waste container 730, a vacuum pump 740 for forming vacuum pressure in the recovery container 730, and a filter 750 for preventing powder stored as being installed in the recovery container 730 from scattering to the outside. do. At this time, the filter 750 prevents the powder stored in the recovery container 730 from flowing into the vacuum pump 740.

The powder supply device 400, when the stage plate (L) is lowered from the box body 210, in order to prevent the powder layer stacked in multiple layers from collapsing, the powder from the edge of the space 110 to the front and rear and left and right sides. Supply, thereby allowing the front surface of the stage plate (L) to be covered with a powder layer (L).

Therefore, when the spage plate (L) descends from the box body 210, powder remains on the edge of the space 110, and the present invention employs a powder recovery unit 700 to recover such powder. .

FIG. 18 is a perspective view showing an excerpt of the cleaning kit of FIG. 1.

As shown, the cleaning kit 800 removes the powder attached to the printer head 630 while forming the binder pattern (B). The cleaning kit 800 is installed on the table 100, and the base 810 on which the pad 820 protruding upward is installed, and the printer head 630 as being installed on the base 810 on one side of the pad 820. The supply roller 830 for supplying the wiper sheet 831 for cleaning the powder attached to the printing nozzle of the, and the pad 820, which is installed on the other side of the base 810, passes through the pad 820. It includes a recovery roller 840 for recovering the wiper sheet 831, and a motor 850 for rotating the recovery roller 840.

FIG. 19 is a perspective view showing the cleaning liquid application kit of FIG. 1, and FIG. 20 is a cross-sectional view of the cleaning liquid application kit of FIG. 19 taken along line XX-XX '.

The cleaning liquid application kit 900 includes the first and second printer heads (so that the wiper sheet 831 can effectively remove the powder applied to the first and second printer heads 631 and 632 of the printer head 630. A cleaning solution is applied to the bottom of 631) (632). The cleaning liquid coating kit 900 is installed on the table 100, and the first and second nozzle facing grooves 911 and 912 corresponding to the first and second printing nozzles 631a and 632a on the upper side. The formed cleaning box 910 and the first and second cleaning solution spray nozzles 920 installed at the inside of the cleaning box 910 to inject the cleaning solution obliquely toward the first and second nozzle facing grooves 911 and 912 930 and a drain pipe 940 for draining the wastewater recovered after cleaning the first and second printing nozzles 631 and 632a.

By this structure, when the printing unit 600 approaches the cleaning box 910, the first and second printer heads 631 and 632 face the first and second nozzle facing grooves 911 and 912, In this state, the first and second cleaning liquid spray nozzles 920 and 930 inject the cleaning liquid at an angle to the first and second nozzle facing grooves 911 and 912. Accordingly, the cleaning liquid may be sprayed with the first and second printing nozzles 631a and 632a having a long width as a result.

As described above, according to the present invention, as shown in FIG. 21, the powder supply device 400 reciprocated along the first and second LM guides 120 and 130 has a large area of powder layer on the stage plate 210. Forming (L), the first, 2LM guides 120, 130, and the printing part 600 which is transported in a plane along the transport LM guide 500 have a specific pattern of a binder pattern (B) on the powder layer (L). ) To harden the powder layer (L) on which the binder pattern (B) is printed, and while the operation of forming the powder layer and the binder pattern is repeated, the lifting operation unit 300 gradually lowers the stage plate 210. It is possible to output a sculpture having a large size while having a three-dimensional shape in the box 200.

In addition, the amount of powder discharged from the powder supply device 400 and the amount of binder sprayed from the printing unit 600 are varied, and the lifting operation unit 300 forms a powder layer (L) and a binder pattern (B). By varying the distance of the stage plate descending in the process, it is possible to vary the quality of the sculpture or the output speed.

And the powder supply device 400 can form a large area powder layer (L) on the stage plate (210), and pressurize the formed powder layer (L) at an even pressure, thereby realizing a large-scale and high-quality output of the printed object. .

The present invention has been described with reference to one embodiment shown in the drawings, but this is only exemplary, and those skilled in the art will understand that various modifications and other equivalent embodiments are possible therefrom.

100 ... table 110 ... space
1120, 130 ... 1,2LM guide 200 ... process box
210 ... stage plate 211 ... ceiling frame
220 ... box body 230 ... bottom plate
240 ... locking block 241 ... stepped
250 ... retaining pin 251 ... pin head
260 ... Spring 300 ... Elevator operation unit
310 ... base 320 ... cylinder
340 ... locking wing 350 ... guide shaft
360 ... Slider rail 361 ... Rail step
362 ... roller 370 ... stopper
380 ... Locking lever 400 ... Powder supply device
410 ... Moving support 420 ... Hopper
430, 440 ... 1, 2 feeder motor 431, 441 ... 1, 2 drive pulley
450 ... powder discharge part 451 ... feeder box
451a ... box discharge groove 451b ... box circumferential groove
452 ... 1st metering discharge roller 452a ... 1st metering groove
452b ... 1st crushing groove 453 ... 2nd dispensing roller
453a ... second fixed groove 453b ... second broken groove
454, 455 ... 1st, 2nd bearing holder 456 ... 1st drive shaft
457 ... Gear assembly 460 ... Flat pressing part
461, 461 '... Bracket wing 462 ... Flat pressing roller
463 ... 2nd drive shaft 470 ... Height adjustment part
471 ... lifting support rod 472 ... adjusting bolt
473 .. handle 474 ... spring
500 ... Transfer LM guide 600 ... Printing unit
610 ... Transfer bracket 611 ... Vertical bracket
612 ... Horizontal bracket 620 ... Binder storage tank
630 ... printer head 631, 632 ... first and second printer head
631a, 632a ... 1st, 2nd printing nozzle 640 ... head block
641, 642 ... first and second head blocks 650 ... syringe
651, 652 ... first and second syringes 700 ... powder recovery unit
710, 720 ... 1st and 2nd powder recovery box 730 ... collection box
740 ... vacuum pump 750 ... filter
800 ... cleaning kit 810 ... base
820 ... Pad 830 ... Supply roller
840 ... recovery roller 850 ... motor
900 ... Cleaning solution application kit 910 ... Cleaning box
911, 912 ... 1st and 2nd nozzle facing groove 920, 930 ... 1st and 2nd cleaning liquid spray nozzle
940 ... drain pipe

Claims (8)

A moving support 410 supported by the first and second LM guides 120 and 130 to be movable;
A hopper 420 installed on the upper side of the moving support 410 as being filled with powder;
First and second feeder motors 430 and 440 installed on one side of the moving support 410;
It is installed on the lower side of the moving support 410, driven by the first feeder motor 430, the powder filled in the hopper 420 is discharged to the stage plate 210 in a wide width to form a powder layer (L ) To form a powder discharge portion 450; And
It is installed on the other side of the lower side of the moving support 410, a flat pressing unit 460 driven by the second feeder motor 440 to pressurize the powder discharged to the stage plate 210; ;
The powder discharge part 450 is fixed to a lower one side of the moving support 410, and a feeder box 451 formed with a box discharge groove 451a long toward the lower side and an upper side of the box discharge groove 451a. The first fixed amount discharge roller 452 formed on the outer circumferential surface with a plurality of first fixed amount grooves 452a symmetrically installed as being rotatably installed in the longitudinal direction, and rotatably installed on the lower side of the box discharge groove 451a. The second fixed amount discharge roller 453 formed on the outer circumferential surface with a plurality of second fixed amount grooves 453a symmetrically in the longitudinal direction, and the first fixed amount discharge roller 452 is axially coupled to the outside of the feeder box 451 The first drive shaft 456 to which the rotational driving force is transmitted from the first feeder motor 430 and the rotational driving force transmitted to the first constant dispensing roller 452 are extended as the second constant dispensing roller 453. It includes a gear assembly (457) for gear coupling the first and second fixed-rate discharge rollers (452, 453) to be delivered to;
The volume of the first metering groove 452a formed on the outer circumferential surface of the first metering discharge roller 452 has a larger volume than the second metering groove 453a formed on the outer peripheral surface of the second metering discharge roller 453;
A plurality of first crushing grooves 452b having opposite corners at the inlet side are formed between the plurality of first constant grooves 452a formed on the outer circumferential surface of the first constant discharge roller 452;
Characterized in that the plurality of second crushing grooves (453b) having a right angle on both sides of the inlet is formed between the plurality of second measuring grooves (453a) formed on the outer circumferential surface of the second metering discharge roller (453); Powder supply device for 3D printers. delete delete delete According to claim 1, The flat pressing unit 460,
A pair of bracket wings (461) (461 ') that is fixed to the lower other side of the moving support (410),
A flat pressing roller 462 rotatably installed between the bracket wings 461 and 461 ',
3D, characterized in that it comprises a second driving shaft (463) which is axially coupled to the flat pressing roller (462) and extends outwardly of the bracket wing (461) to transmit rotational driving force from the second feeder motor (440). Powder supply device for printers. According to claim 1, A pair of height adjustment unit 470 is installed between the moving support 410 and the flat pressing unit 460 to adjust the height of the flat pressing unit 460 relative to the moving support 410 );
The height adjustment unit 470 is fixed to the top of each of the bracket blades 461 and 461 ', and the lifting support rod 471 through which the moving support 410 is slidably slidable in the vertical direction, and the moving An adjustment bolt 472 screwed to penetrate the moving support 410 at an upper side of the support 410 to be in close contact with the center of the bracket wing 461, and a handle 473 installed on the adjustment bolt 472 ) 3D printer powder supply device comprising a. A table 100 which is installed on a frame F supported on the ground, and has first and second LM guides 120 and 130 located on both sides of the space 110 opened upward;
When coupled to the frame (F) as being in close contact with the edge of the space 110, the process box 200 having a stage plate 210 is carried out the output process of the sculpture while being elevated;
An elevation operation unit 300 installed on the frame F to elevate the stage plate 210;
As a reciprocating transport along the first and second LM guides 120 and 130, a powder supply device 400 for supplying powder for output of the sculpture to the stage plate 210 to form a flat powder layer (L) 400 )Wow;
A transport LM guide 500 installed across the first and second LM guides 120 and 130 and reciprocating along the first and second LM guides 120 and 130;
Includes; as the reciprocating transfer on the transfer LM guide 500, the printing unit 600 having a printer head 630 to form a specific pattern of the binder pattern (B) by spraying a binder;
The powder supply device 400 includes a moving support 410 supported by the first and second LM guides 120 and 130 to be movable; A hopper 420 installed on the upper side of the moving support 410 as being filled with powder; First and second feeder motors 430 and 440 installed on one side of the moving support 410; It is installed on the lower side of the moving support 410, driven by the first feeder motor 430, the powder filled in the hopper 420 is discharged to the stage plate 210 in a wide width to form a powder layer (L ) To form a powder discharge part (450); It is installed on the other side of the lower side of the moving support 410, a flat pressing unit 460 driven by the second feeder motor 440 to pressurize the powder discharged to the stage plate 210; ;
The powder discharge part 450 is fixed to a lower one side of the moving support 410, and a feeder box 451 formed with a box discharge groove 451a long toward the lower side and an upper side of the box discharge groove 451a. The first fixed amount discharge roller 452 formed on the outer circumferential surface with a plurality of first fixed amount grooves 452a symmetrically installed as being rotatably installed in the longitudinal direction, and rotatably installed on the lower side of the box discharge groove 451a. The second fixed amount discharge roller 453 formed on the outer circumferential surface with a plurality of second fixed amount grooves 453a symmetrically in the longitudinal direction, and the first fixed amount discharge roller 452 is axially coupled to the outside of the feeder box 451 The first drive shaft 456 to which the rotational driving force is transmitted from the first feeder motor 430 and the rotational driving force transmitted to the first constant dispensing roller 452 are extended as the second constant dispensing roller 453. It includes a gear assembly (457) for gear coupling the first and second fixed-rate discharge rollers (452, 453) to be delivered to;
The volume of the first metering groove 452a formed on the outer circumferential surface of the first metering discharge roller 452 has a larger volume than the second metering groove 453a formed on the outer peripheral surface of the second metering discharge roller 453;
A plurality of first crushing grooves 452b having opposite corners at the inlet side are formed between the plurality of first constant grooves 452a formed on the outer circumferential surface of the first constant discharge roller 452;
Characterized in that the plurality of second crushing grooves (453b) having a right angle on both sides of the inlet is formed between the plurality of second measuring grooves (453a) formed on the outer circumferential surface of the second metering discharge roller (453); 3D printer. delete

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