KR101622753B1 - High Viscous Material Extruding Apparatus and 3D Printer Having the Same - Google Patents

High Viscous Material Extruding Apparatus and 3D Printer Having the Same Download PDF

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Publication number
KR101622753B1
KR101622753B1 KR1020150159044A KR20150159044A KR101622753B1 KR 101622753 B1 KR101622753 B1 KR 101622753B1 KR 1020150159044 A KR1020150159044 A KR 1020150159044A KR 20150159044 A KR20150159044 A KR 20150159044A KR 101622753 B1 KR101622753 B1 KR 101622753B1
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South Korea
Prior art keywords
viscosity material
extrusion
assembly
driving
mixing
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KR1020150159044A
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Korean (ko)
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홍국선
강명희
류지원
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홍국선
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    • B29C67/0085—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)

Abstract

The present invention relates to a high-viscosity material extrusion apparatus. The high-viscosity material extrusion apparatus comprises: an extrusion assembly including a nozzle through which a high-viscosity material is sprayed, an inlet section communicated with the nozzle for introducing the high-viscosity material, and a conveying shaft provided in the inlet section for conveying the high-viscosity material introduced to the inlet section to the nozzle; and a driving assembly including a driving section for transferring driving power to the conveying shaft.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high-viscous material extrusion apparatus,

TECHNICAL FIELD The present invention relates to a high-viscosity material extrusion apparatus and a 3D printer including the same, and more particularly, to a high-viscosity material extrusion apparatus capable of efficiently transferring and extruding a high-viscosity material through an efficient power transmission structure and a 3D printer will be.

In recent years, 3D printers have been widely used in a variety of industries because of the spread of 3D printers based on three-dimensional modeling. Such a 3D printer has been utilized so much that it has become a core technology of the future, and technological development activity is actively performed.

Of these, 3D printers, which are applied to tissue engineering and regenerative medicine, have been attracting attention, in which cells and tissues are cultured in vitro and then applied to living bodies. The molding material used in such fields often has a high viscosity in general, such as ceramics.

Therefore, in order to use such a high-viscosity material as a material for a 3D printer, it is necessary to apply extreme pressure to the 3D printer. However, since the developed 3D printer has a pneumatic system, There is a problem that smooth injection can not be performed.

In addition, there is a problem that the maintenance cost is greatly increased because equipment is damaged due to overload during driving. 3D printers are very expensive, and users are in a great deal of pressure.

Therefore, a method for solving such problems is required.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems of the prior art described above, and has as its object to provide an extrusion apparatus that provides a sufficient pressure for a high-viscosity material to enable smooth extrusion.

It is also an object of the present invention to provide an extrusion apparatus capable of easily mixing and dispensing different types of high viscosity materials or materials of the same type having different concentrations.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, the present invention provides a high viscosity material extrusion apparatus comprising: a nozzle to which a high viscosity material is injected; an inlet communicating with the nozzle and having a high viscosity material introduced therein; And a drive assembly including a pushing assembly including a transfer shaft for transferring the introduced high viscosity material to the nozzle and a driving unit for transmitting a driving force to the transfer shaft.

The conveying shaft may include a conveying screw for conveying the high-viscosity material as it is rotated by the driving force of the driving unit.

The inlet portion may include a through hole formed along a longitudinal direction of the conveying shaft and through which the conveying shaft is inserted, an inlet hole communicating with the through hole to introduce the high viscosity material into the through hole, To the outside.

The extrusion assembly may further include a heating unit disposed between the inlet and the nozzle for heating the transported high-viscosity material.

Further, the driving unit may include a rotation motor, and the driving assembly may further include a harmonic reducer for preventing backlash of the rotation motor.

And a power transmission assembly for transmitting a driving force generated from the driving assembly to the extrusion assembly.

The power transmission assembly may include a universal joint that absorbs a driving eccentricity generated in a process of transmitting the driving force of the driving assembly to the extrusion assembly.

The power transmission assembly may include a sealing member to prevent entry of a high viscosity material from the extrusion assembly.

The sealing member may include an outer circumferential portion and an inner circumferential portion provided on the inner side of the outer circumferential portion and having an inner diameter smaller from the lower portion toward the upper portion.

And a supply unit for supplying a high-viscosity material to the inflow part.

The supply unit may further include a piston portion having a housing space formed therein and having a discharge portion formed at a lower end thereof and a piston head movably disposed along the longitudinal direction of the housing, A first supply line for supplying a working fluid to an upper portion of the piston head to lower the piston head, and a second supply line for supplying a high viscosity material to a lower portion of the piston head.

The supply unit may include a preheating unit for heating the high-viscosity material.

The plurality of extrusion units may further include a mixing unit connected to the plurality of extrusion units and receiving and mixing the high viscosity material injected from the extrusion units.

The mixing unit may include a mixing frame for enclosing the nozzles of the plurality of extrusion units, a mixing part for mixing the high viscosity material which is provided below the mixing frame and transferred from the plurality of extrusion units, And a mixed flow path for discharging the material.

The mixing unit may further include a plurality of through holes formed therein and a perforated plate provided in the mixing portion to reduce a cross-sectional area of a path through which the high-viscosity material flows.

The present invention may be in the form of a 3D printer including the above-mentioned high-viscosity substance extrusion apparatus.

In order to solve the above problems, the present invention provides a high-viscosity material extrusion apparatus and a 3D printer including the same.

First, since it has an efficient power transmission structure, there is an advantage that the highly viscous material can be extruded effectively and smoothly.

Second, the durability of the apparatus can be improved, and the cost required for maintenance can be remarkably reduced.

Third, there is an advantage that a plurality of high viscosity materials can be easily mixed and used.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view showing a state of an extrusion unit in a high-viscosity substance extrusion apparatus according to an embodiment of the present invention;
2 is a view for explaining a high viscosity material extrusion apparatus according to an embodiment of the present invention. An exploded perspective view in which each constituent element of the extrusion unit is exploded;
FIG. 3 is a perspective view of an extrusion assembly in a high-viscosity material extrusion apparatus according to an embodiment of the present invention; FIG.
FIG. 4 is a cross-sectional view illustrating an inlet structure of an extrusion assembly in a high-viscosity material extrusion apparatus according to an embodiment of the present invention; FIG.
5 is a perspective view showing an extrusion structure of an extrusion assembly in a high-viscosity material extrusion apparatus according to an embodiment of the present invention;
6 is a perspective view showing a sealing member structure of a power transmission assembly in a high-viscosity substance extrusion apparatus according to an embodiment of the present invention;
7 is a front view showing a state in which a supply unit is mounted on an extrusion unit in a high-viscosity substance extrusion apparatus according to an embodiment of the present invention;
8 is a cross-sectional view showing a structure of a supply unit in a high-viscosity material extrusion apparatus according to an embodiment of the present invention; And
9 is a cross-sectional view of a high viscosity material extrusion apparatus according to another embodiment of the present invention, in which a plurality of extrusion units are connected to a mixing unit;
10 is a cross-sectional view of a perforated plate provided in a mixing unit in a high-viscosity material extrusion apparatus according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted.

FIG. 1 is a perspective view showing a state of an extrusion unit 100 in a high-viscosity substance extrusion apparatus according to an embodiment of the present invention, and FIG. 2 is a view for explaining a high-viscosity substance extrusion apparatus according to an embodiment of the present invention. Is an exploded perspective view in which components of the extrusion unit 100 are exploded.

1, the extrusion unit 100 mainly includes a drive assembly A and an extrusion assembly C, and a power transmission (not shown) provided between the drive assembly A and the extrusion assembly C, Assembly (B).

In the following description, the side on which the drive assembly A is positioned is defined as an upper side and the side on which the extrusion assembly C is positioned is defined as a lower side. This is set for convenience of description, and it should be understood that the scope of the present invention is not limited to the scope of the present invention.

Further, the high-viscosity material has high viscosity such as ceramics and the like, and any material that can be used for 3D printing can be applied without limitation. In addition, the present invention can be applied to tissue engineering or regenerative medicine to produce alveolar bone growth agents for making artificial bones combined with jawbone before implantation. However, the present invention is not limited to this, and it goes without saying that the present invention can be applied to all business fields in which a product can be manufactured using a highly viscous material such as ceramics.

Details of the drive assembly A, the power transmission assembly B and the extrusion assembly C will be described in detail with reference to FIG.

First, the extrusion assembly C is a component for transferring and dispensing a substantially viscous substance. The extrusion assembly C includes an inlet 170, a feed shaft 180 and a nozzle 195, and additionally has a fixing nut 175 And a heating unit 190, as shown in FIG.

Specifically, the inlet 170 is connected to an external supply device or the like, receives a high-viscosity material, and communicates with the nozzle 195. The transfer shaft 180 is provided in the inflow section 170 to transfer the high viscosity material introduced into the inflow section 170 to the nozzle 195.

In this embodiment, a heating unit 190 may be selectively provided between the inlet 170 and the nozzle 195, and the fixing unit 190 may be fixed to the inlet 190 and the heating unit 190, A nut 175 may be provided. The heating unit 190 heats the transferred viscous material to raise the temperature.

The driving assembly C is a component for transmitting a driving force to the conveying shaft 180 of the extrusion assembly C and includes a driving unit 102 and a harmonic reducer 104 in this embodiment.

The driving unit 102 generates a driving force, and various actuators such as a rotary motor may be used. In particular, in the present embodiment, the driving unit 102 is formed in the form of a servo motor, and the rotation speed, the torque, and the like can be controlled through a separate control unit.

The harmonic reducer 104 is provided below the driving unit 102 to prevent backlash of the rotary motor and is directly connected to the power transmission assembly B. [

The power transmission assembly B is a component for transmitting the driving force of the driving assembly A to the extrusion assembly B and can perform various roles such as vibration reduction and driving eccentric absorption in addition to power transmission.

In this embodiment, the power transmission assembly B includes a first housing 110a, a second housing 110b, a third housing 110c, and a fourth housing 110d coupled to each other, A bearing module 130, a connecting shaft 140, a universal joint 150, and a sealing member 160 are accommodated.

The coupler 120 interconnects the harmonic reducer 104 and the connecting shaft 140. The bearing module 130 is connected to the harmonic reducer 104 and the connecting shaft 140 in the course of rotation of the connecting shaft 140 by the driving unit 102 Thereby decreasing the resistance of the battery. In particular, in this embodiment, the bearing module 130 includes a pair of bearings and a snap ring.

The universal joint 150 is connected to the connection shaft 140 and absorbs the driving eccentricity generated in the process of transmitting the driving force of the driving assembly A to the extrusion assembly C. [

That is, the universal joint 150 can absorb the driving eccentricity generated due to the viscosity of the high viscosity material flowing into the extrusion assembly C through the plurality of joints.

The sealing member 160 prevents a high viscosity material from flowing into the power transmission assembly B from the extrusion assembly C side. In this embodiment, the pair of sealing members 160 are provided, Structure.

Each component of the extrusion unit 100 has been described above. 3 to 5, the structure of the extrusion assembly C is shown in more detail, and the extrusion assembly C will be described in more detail with reference to FIG.

As described above, the extrusion assembly C includes an inlet 170, a feed shaft 180, a nozzle 195, a fixing nut 175, and a heating portion 190.

As shown in FIG. 4, a central portion of the inlet 170 is formed in the through hole 171 formed along the longitudinal direction of the feed shaft 180 and through which the feed shaft 180 is inserted.

The inlet 170 is formed with an inlet hole 172 communicating with the through hole 171 to introduce a high viscosity material into the through hole 171 and a discharge hole 171 through which air in the through hole 171 is discharged to the outside Holes 174 are further formed.

That is, the high viscosity material flowing through the inlet hole 172 flows into the through hole 171 and can be transferred to the nozzle 195 side by the transfer shaft 180.

An external suction device or the like may be connected to the discharge hole 174, so that air in the through hole 171 can be discharged. The reason for doing this is to prevent the occurrence of bubbles in the high-viscosity material to increase the density.

5, the transfer shaft 180 is provided at its front end with a transfer screw 182 for transferring a high-viscosity material forward in accordance with rotation of the transfer shaft 180. The transfer screw 182 passes through a passage formed inside the heating portion 191 And can be inserted into the insertion hole 196 in the nozzle 195 through the hole 191.

That is, the rotational force generated by the rotational motor of the driving unit 102 is transmitted to the conveying shaft 180 through the power transmitting assembly B, and the conveying screw 182 is rotated to convey the high viscosity material forward do.

6, the sealing member 160 of the power transmission assembly B is shown. Specifically, in this embodiment, the sealing member 160 includes an outer peripheral portion 162 and an inner peripheral portion 164.

The outer peripheral portion 162 is in close contact with the fourth housing 110d (see FIG. 2) to prevent the entry of a high viscosity material. The inner circumferential portion 164 is provided on the inner side of the outer circumferential portion 162, and the inner circumferential portion is formed to have a smaller inner diameter from the lower portion to the upper portion. Therefore, it is possible to effectively prevent backflow of the high viscosity material in a state where the lower end of the transfer shaft 180 is inserted into the hollow of the inner peripheral portion 164.

Each component of the extrusion unit 100 has been described above. Hereinafter, other configurations applicable to the high-viscosity material extrusion apparatus according to the present invention will be described.

7 and 8, the high-viscosity material extrusion apparatus according to the present embodiment may further include a supply unit 200 connected to the inlet of the extrusion unit 100 to supply a high-viscosity material .

The supply unit 200 may correspond to the extrusion unit 100 in a one to one ratio and may be connected to the extrusion unit 100 through a connection pipe 240 so as to supply a predetermined high viscosity material into the extrusion unit 100. [ ). ≪ / RTI >

In this embodiment, the supply unit 200 includes a housing 210, a piston 220, a first supply line 230a, and a second supply line 230b.

The housing 210 has a receiving space 212 formed therein and a discharging unit 211 at a lower end thereof. The discharging unit 211 is a component connected to one side of the coupling pipe 240 and transmitting the high viscosity material accommodated in the accommodating space 212 to the extrusion unit 100 side.

The piston part 220 includes a piston head 225 provided in the accommodation space 212 and moved along the longitudinal direction of the housing 210. At this time, packing 226 is provided on both sides of the piston head 225 to prevent the fluid from leaking through the periphery of the piston head 225.

The first supply line 230a is a component that allows a working fluid to be supplied to an upper portion of the piston head 225 to lower the piston head 225. A working fluid such as oil can be supplied to the upper portion of the piston head 225 through the first supply line 230a and the piston head 225 is lowered by the pressure of the working fluid, 2 supply line 230b to the discharging unit 211. The high-

Although not shown, the supply unit 200 may include a preheating portion for heating the high-viscosity material in the accommodation space 212. [ As with the heating unit 190 (see FIG. 2), the preheating unit may heat the high-viscosity material to raise the temperature. At this time, the preheating unit may be driven independently of the heating unit 190, or may be integrally driven.

Although the supply unit 200 is formed in the form of a hydraulic pump in this embodiment, the supply unit 200 may be formed in various forms without being limited thereto. For example, a method of extruding a high viscosity material by driving an electric motor other than a hydraulic pressure source may be applied.

9, a plurality of extrusion units are connected to the mixing unit 300 in a high-viscosity substance extrusion apparatus according to another embodiment of the present invention.

As shown in FIG. 9, a plurality of extrusion units may be provided, and in this case, a mixing unit 300 for mixing the high viscosity materials of the respective extrusion units may be further provided. The mixing unit 300 is a component that receives and mixes and dispenses high-viscosity materials injected from the respective extrusion units.

The mixing unit 300 includes a mixing frame 310 having conveying screws 182a and 182b provided in a plurality of extrusion units and a mixing unit 320 is disposed below the mixing frame 310 .

A plurality of conveyance passages 330a and 330b for conveying the high viscosity material conveyed by each of the extrusion units are formed on the inner side of the mixing frame 310 and the mixing portion 320.

The plurality of conveyance passages 330a and 330b meet in a lower region of the mixing portion 320 so that the high viscosity materials transferred from the respective conveyance passages 330a and 330b are mixed and discharged to the outside through the mixing passage 350. [ Can be discharged. Since the mixing unit 300 is provided as described above, it is possible to easily mix and dispense different kinds of high-viscosity materials or materials of the same high-viscosity type having different concentrations.

In this embodiment, the two extrusion units are connected to the mixing unit 300, but a larger number of extrusion units may be connected.

Meanwhile, in the present embodiment, the perforated plate 340 is provided at a position where the plurality of transfer paths 330a and 330b and the mixing path 350 are connected. As shown in FIGS. 9 and 10, the perforated plate 340 is provided on a path through which a high-viscosity material flows, and has a plurality of through holes 342.

That is, the perforated plate 340 reduces the total cross-sectional area of the path through which the high-viscosity material flows, and temporarily stagnates the high-viscosity material flowing from the plurality of transfer paths 330a and 330b and slows the flow rate.

Accordingly, the transferred high-viscosity material stagnates on the perforated plate 340 and is uniformly mixed with each other, and flows through the mixing hole 350 and the through hole 342.

The above-described high-viscosity material extrusion apparatus of the present invention can be applied to various apparatuses, and particularly when applied to 3D printers, excellent effects can be expected.

Since the present invention has an efficient power transmission structure, the highly viscous material can be effectively and smoothly extruded, and the durability of the device can be improved, so that the cost required for maintenance can be remarkably reduced.

Further, since the present invention can easily mix and use a plurality of high-viscosity materials, it is possible to provide a performance suitable for a 3D printer.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them. Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

100: extrusion unit A: drive assembly
B: Power transmission assembly C: Extrusion assembly
102: driving unit 104: harmonic speed reducer
110a: first housing 110b: second housing
110c: third housing 110d: fourth housing
120: coupler 130: bearing module
140: connecting shaft 150: universal joint
160: sealing member 170:
175: Fixing nut 180: Feed shaft
182: Feed screw 190:
195: nozzle 200: supply unit
210: housing 212: accommodation space
220: piston part 225: piston head
230a: first supply line 230b: second supply line
300: mixing unit 310: mixing frame
320: Mixing parts 330a and 330b:
340: Perforated plate 342: Through hole
350: Mixing channel

Claims (16)

A nozzle for injecting a high viscosity material; an inlet communicating with the nozzle and having a high viscosity material introduced thereinto; and a conveying shaft provided in the inlet portion for conveying the high viscosity material introduced into the inlet to the nozzle, assembly; And
A driving assembly including a driving unit for transmitting driving force to the conveying shaft;
And a sealing member disposed between the driving assembly and the extrusion assembly to transmit a driving force generated from the driving assembly to the extrusion assembly and prevent a high viscosity material from flowing backward from the extrusion assembly to the rear side.
And a plurality of extrusion units,
Further comprising a mixing unit connected to the plurality of extrusion units to receive and dispense a high viscosity material injected from each of the extrusion units,
The mixing unit includes:
A mixing frame surrounding the nozzles of the plurality of extrusion units;
A mixing unit provided at a lower portion of the mixing frame to mix high-viscosity materials transferred from the plurality of extrusion units;
A mixing flow path for discharging the high viscosity material mixed by the mixing portion; And
A plurality of through holes are formed in the mixing portion, and a cross-sectional area of a path through which the high-viscosity material flows is reduced to slow the flow rate of the high-viscosity material transferred from the plurality of extrusion units to mix with each other;
And a high viscosity material extrusion apparatus. The method according to claim 1,
The feed shaft
And a conveying screw for conveying the high-viscosity material as it is rotated by the driving force of the driving unit. The method according to claim 1,
Wherein:
A through hole formed along a longitudinal direction of the conveying shaft and through which the conveying shaft is inserted;
An inflow hole communicating with the through-hole to introduce the high-viscosity material into the through-hole; And
A discharge hole for discharging the air in the through hole to the outside;
And a high viscosity material extrusion apparatus. The method according to claim 1,
The extrusion assembly comprises:
And a heating unit provided between the inflow unit and the nozzle for heating the transported high-viscosity material. The method according to claim 1,
Wherein the driving unit includes a rotation motor,
The drive assembly includes:
Further comprising a harmonic speed reducer for preventing backlash of the rotary motor. delete The method according to claim 1,
The power transmission assembly includes:
And a universal joint for absorbing a driving eccentricity generated in a process of transmitting the driving force of the driving assembly to the extrusion assembly. delete The method according to claim 1,
Wherein the sealing member comprises:
And an inner peripheral portion provided on the inner side of the outer peripheral portion and having an inner diameter smaller toward the upper portion from the lower portion. The method according to claim 1,
And a supply unit for supplying a high-viscosity material to the inflow portion. 11. The method of claim 10,
The supply unit includes:
A housing having a receiving space formed therein to be elongated in the vertical direction and having a discharge part at a lower end thereof;
A piston portion provided in the accommodating space and including a piston head moved along the longitudinal direction of the housing;
A first supply line for supplying a working fluid to an upper portion of the piston head to lower the piston head; And
A second supply line for supplying a high viscosity material to a lower portion of the piston head;
And a high viscosity material extrusion apparatus. 11. The method of claim 10,
The supply unit includes:
And a preheating section for heating the high-viscosity material. delete delete delete A 3D printer comprising the high-viscosity material extrusion apparatus according to any one of claims 1 to 5, 7, 9 to 12.
KR1020150159044A 2015-11-12 2015-11-12 High Viscous Material Extruding Apparatus and 3D Printer Having the Same KR101622753B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101938233B1 (en) * 2016-11-11 2019-01-14 (주) 허브인소프트 The apparatus of the outputting head in a color 3-d printer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1270883A (en) * 1999-08-18 2000-10-25 仲伟虹 Equipment and process for layer manufacture
CN203496288U (en) * 2013-09-12 2014-03-26 西安科技大学 Nozzle device of rapid sugar group molding machine
CN104626556A (en) * 2013-11-12 2015-05-20 华中科技大学 Fused deposition three dimensional printing nozzle and printer
KR101524441B1 (en) * 2013-12-16 2015-06-09 박용호 3d printer head

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1270883A (en) * 1999-08-18 2000-10-25 仲伟虹 Equipment and process for layer manufacture
CN203496288U (en) * 2013-09-12 2014-03-26 西安科技大学 Nozzle device of rapid sugar group molding machine
CN104626556A (en) * 2013-11-12 2015-05-20 华中科技大学 Fused deposition three dimensional printing nozzle and printer
KR101524441B1 (en) * 2013-12-16 2015-06-09 박용호 3d printer head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101938233B1 (en) * 2016-11-11 2019-01-14 (주) 허브인소프트 The apparatus of the outputting head in a color 3-d printer

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