CN214726533U

CN214726533U - Continuous fibers compounding nozzle, dispersion are mixed in extrusion device and 3D printer

Info

Publication number: CN214726533U
Application number: CN202120362030.2U
Authority: CN
Inventors: 胡雨辰; 秦川; 马岩
Original assignee: Shanghai Dajie Robot Technology Co ltd
Current assignee: Shanghai Dajie Robot Technology Co ltd
Priority date: 2021-02-09
Filing date: 2021-02-09
Publication date: 2021-11-16
Anticipated expiration: 2031-02-09

Abstract

The utility model provides a continuous fiber mixing nozzle, which comprises a nozzle and a wire feeding pipe, wherein the nozzle comprises a melting flow channel, a wire pipe channel and a mixing cavity, and the melting flow channel is communicated with the mixing cavity and used for leading in an extrusion material; the wire feeding pipe is arranged in the wire pipe channel, and the wire guide opening of the wire feeding pipe is communicated with the outside of the nozzle. The utility model provides a continuous fibers dispersion compounding nozzle and extruder can arrange the continuous even dispersion of reinforcing fiber beam silk in printing material, has effectively increased the shaping intensity that continuous fibers 3D printed, and has solved the fracture risk that exists among the current fusion technique, has greatly strengthened the intensity that 3D printed the component. Additionally, the utility model discloses can also be according to the extrusion capacity and the speed of sending a silk of printing speed adjustment cellosilk.

Description

Continuous fibers compounding nozzle, dispersion are mixed in extrusion device and 3D printer

Technical Field

The utility model relates to a continuous fibers 3D printing device technical field.

Background

The FDM3D technology has been in existence for many years, but is limited by the material itself, and the produced product cannot meet the use scenario of higher strength requirements. Conventional fiber-reinforced 3D printed materials incorporate chopped fibers into the master batch, but because the chopped fibers are discrete and discontinuous and of limited length, the strength gains provided are not very large and therefore the high strength requirements are still not met.

For this reason, a continuous fiber printing technique has been developed, in which a 3D printing material is melted to serve as an adhesive to adhere fibers together. The fibers distribute the load smoothly in such prints, and are a very strong and light composite material that greatly enhances the structural strength of the product. According to conventional 3D printing of continuous fibers, molten accumulated materials are uniformly attached to the continuous fibers, fiber materials and printed materials are laminated, the printed materials adjacent to the fiber materials up and down cannot be well fused, and the possibility of cracking is caused when the fibers are stressed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the above-mentioned not enough that exists among the prior art, provide a be applied to compounding nozzle that continuous fibers 3D printed, can extrude reinforcing fiber bundle silk in printing material after continuous, even arranging.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a continuous fiber mixing nozzle comprises a nozzle and a filament feeding pipe, wherein the nozzle comprises a melting flow channel, a filament pipe channel and a mixing cavity, and the melting flow channel is communicated with the mixing cavity and used for guiding an extrusion material; the wire feeding pipe is arranged in the wire pipe channel, and the wire guide opening of the wire feeding pipe is communicated with the outside of the nozzle.

Furthermore, a plurality of wire tube channels are respectively and independently and uniformly distributed on the upper part of the nozzle; preferably 1 to 16. Correspondingly, the wire feeding pipes are provided with a plurality of wires which are respectively arranged in the wire pipe channels, and the contact positions of the wire feeding pipes and the wire pipe channels are sealed.

Further, the horizontal height difference between the wire outlet of the wire feeding pipe and the discharge hole of the nozzle is-6 mm; furthermore, the horizontal height difference is 0-6mm, and a wire outlet of the wire feeding pipe is arranged in the material mixing cavity.

Furthermore, the inner diameter of the wire feeding pipe is 1-3mm, and the wall thickness is 0.1-2 mm.

Furthermore, the melting runner and the mixing cavity are L-shaped integrated channels. When the device works, the melting flow channel is communicated with a discharge port of a nozzle of the 3D printing extruder, and the extrusion material is introduced into the mixing cavity and is extruded from the nozzle together with the continuous fiber filaments after being mixed and melted.

The utility model also provides a continuous fiber dispersing, mixing and extruding device, which comprises the continuous fiber mixing nozzle, the extruder and the fiber yarn feeding disc, wherein the fiber yarn feeding disc is arranged above the yarn feeding pipe and is used for guiding fiber yarns into the yarn feeding pipes; the extruder is connected with a continuous fiber mixing nozzle and is used for inputting an extrusion material into the melting runner.

Further, the extruder include drive arrangement, extrude the screw rod, extrude nozzle, hopper, feed cylinder and heating collar, the extrusion screw rod locate in the feed cylinder, the discharge gate of hopper and the feed inlet intercommunication of feed cylinder, drive arrangement with extrude the screw rod and be connected, the discharge gate intercommunication of extrusion nozzle and feed cylinder, the heating collar locate the feed cylinder lateral wall.

The extrusion nozzle is communicated with a melting flow channel of the continuous fiber mixing nozzle, the printing material is heated and melted by the heating ring and then is compressed and extruded out of the barrel by the extrusion screw, and the printing material enters the melting flow channel after reaching the extrusion nozzle and then enters the mixing cavity.

Further, cellosilk feed dish include the charging tray support, follow driving wheel, action wheel, motor and rotation area, follow driving wheel, action wheel and motor locate the charging tray support respectively on, rotation area cover locate from driving wheel and action wheel, the motor be used for driving the action wheel, follow the driving wheel and be used for settling the cellosilk dish.

During operation, the cellosilk dish is transferred the cellosilk to sending the silk pipe under the drive of following the driving wheel in succession, and each fasciculus cellosilk is followed the fuse extrusion material parcel in the respective silk pipe export promptly of sending out to under the effect of extrusion power and pulling force, constantly take out from sending the silk pipe, the even discharge gate to continuous fibers compounding nozzle of dispersion of reinforcing fiber fasciculus silk, 3D prints the cross-section of extruded material promptly.

Furthermore, a plurality of driven wheels are arranged, and the number of the driven wheels is equal to or more than the number of the wire feeding pipes. Each driven wheel is simultaneously sleeved in one rotating belt and synchronously rotates with the driving wheel. Furthermore, the motor is a stepping motor, and the rotating speed can be adjusted according to the extrusion amount of the extruder and the printing speed.

Further, the fiber yarn supply disc comprises a fiber yarn disc.

The utility model has the advantages that:

the utility model provides a continuous fibers dispersion compounding nozzle and extruder can arrange the continuous even dispersion of reinforcing fiber beam silk in printing material, has effectively increased the shaping intensity that continuous fibers 3D printed, and has solved the fracture risk that exists among the current fusion technique, has greatly strengthened the intensity that 3D printed the component.

Additionally, the utility model discloses can also be according to the extrusion capacity and the speed of sending a silk of printing speed adjustment cellosilk.

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:

drawings

Fig. 1 is a partial cross-sectional view of a continuous fiber dispersing and mixing extrusion device according to an embodiment of the present invention.

Fig. 2 is a sectional view of an outlet of a continuous fiber mixing nozzle provided by an embodiment of the present invention.

Fig. 3 is a schematic structural view of a fiber yarn feeding tray according to an embodiment of the present invention.

Description of reference numerals:

1 nozzle, 101 melting flow channel, 102 wire tube channel and 103 mixing cavity

2 wire feeding pipe

3 extruder, 301 drive, 302 extrusion screw, 303 extrusion nozzle, 304 hopper 305 barrel, 306 heating ring

4 fiber yarn feeding disc, 401 tray bracket, 402 driven wheel, 403 driving wheel, 404 motor 405 rotating belt and 406 fiber yarn disc

5 printing Material

6 fiber bundle silk

7 mixture

Detailed Description

The specific embodiments described herein are merely illustrative of the principles of this patent and are not intended to limit the scope of the disclosure. It should be noted that, for convenience of description, only some structures related to the technical solution of the present disclosure are shown in the drawings, not all structures.

Before discussing exemplary embodiments in greater detail, it should be noted that the structures of the device components and/or the modules themselves mentioned in the embodiments, if not specified in detail, are those that can be understood or commercially available to those skilled in the art in light of the present disclosure.

As shown in fig. 1 and fig. 2, the continuous fiber mixing nozzle provided in this embodiment comprises a nozzle 1 and a filament feeding tube 2, wherein the nozzle 1 comprises a melt flow channel 101, a filament tube channel 102 and a mixing cavity 103, and the melt flow channel 101 is communicated with the mixing cavity 103 for introducing an extrusion material; the wire feeding pipe 2 is arranged in the wire pipe channel 102, and a wire guiding opening of the wire feeding pipe 2 is communicated with the outside of the nozzle 1.

A plurality of wire tube channels 102 can be arranged and are respectively and independently and uniformly distributed on the upper part of the nozzle 1; preferably 1 to 16. Correspondingly, the number of the wire feeding pipes 2 is preferably 1-16, the wire feeding pipes are respectively arranged in the wire pipe channel 102, and the contact part of the wire feeding pipe 2 and the wire pipe channel 102 is sealed.

In a preferred embodiment, the wire outlet of the wire feeding pipe 2 and the discharge port of the nozzle 1 are provided with a horizontal height difference of-6 to 6mm, more preferably 0 to 6mm, and the wire outlet of the wire feeding pipe 2 is provided in the mixing chamber 103.

Further, the preferable wire feeding tube 2 has an inner diameter of 1 to 3mm and a wall thickness of 0.1 to 2 mm.

As shown in fig. 1, the continuous fiber dispersing and mixing extrusion device provided in this embodiment includes the continuous fiber mixing nozzle provided in this patent embodiment, an extruder 3, and a fiber yarn feeding tray 4, where the fiber yarn feeding tray 4 is disposed above the fiber feeding pipes 2 and is used for introducing fiber yarns into the fiber feeding pipes 2; the extruder 3 is connected to a continuous fiber mixing nozzle for feeding the extrusion material into the melt channel 101.

The extruder 3 comprises a driving device 301, an extrusion screw 302, an extrusion nozzle 303, a hopper 304, a material barrel 305 and a heating ring 306, wherein the extrusion screw 302 is arranged in the material barrel 305, a discharge hole of the hopper 304 is communicated with a feed hole of the material barrel 305, the driving device 301 is connected with the extrusion screw 302, the extrusion nozzle 303 is communicated with a discharge hole of the material barrel 305, and the heating ring 306 is arranged on the side wall of the material barrel 305.

The extrusion nozzle 303 is communicated with a melting flow channel 101 of the continuous fiber mixing nozzle, and the melting flow channel 101 and the mixing cavity 103 are L-shaped integrated channels. During operation, the printing material is heated by the heating ring to melt and then is compressed by the extrusion screw to be extruded out of the barrel, and then enters the melting flow channel 101 after reaching the extrusion nozzle and then enters the mixing cavity 103, and the extrusion material is extruded out of the nozzle after being mixed and melted with the continuous fiber yarn in the mixing cavity 103.

In one preferred embodiment, as shown in fig. 3, the fiber yarn feeding tray 4 includes a tray support 401, a driven wheel 402, a driving wheel 403, a motor 404 and a rotating belt 405, the driven wheel 402, the driving wheel 403 and the motor 404 are respectively disposed on the tray support 401, the rotating belt 405 is sleeved on the driven wheel 402 and the driving wheel 403, the motor 404 is used for driving the driving wheel 403, and the driven wheel 402 is used for placing the fiber yarn tray. The filament supply reel 4 may also include a filament reel 406.

The driven wheels 402 can be arranged according to the requirement, and the number of the driven wheels is equal to or more than the number of the wire feeding pipes 2. Each driven wheel 402 is simultaneously sleeved in a rotating belt 405 and rotates synchronously with the driving wheel 403.

During operation, the cellosilk dish is transferred the cellosilk to send silk pipe 2 under the drive of follow driving wheel in succession, and each fasciculus cellosilk comes out from respective send silk pipe 2 export and is promptly wrapped up by the melting extrusion material in compounding chamber 103 to under the effect of extrusion power and drag force, constantly take out from sending silk pipe 2, the even dispersion of reinforcing fiber bundle silk is to the discharge gate of continuous fibers compounding nozzle, 3D prints the cross-section of extruding the material promptly.

In one preferred embodiment, the motor 404 is a stepping motor, and the rotation speed can be adjusted according to the extrusion amount of the extruder and the printing speed.

Further preferably, the tray holder 401 is fixedly connected to the driving device 301.

The following examples illustrate the application of the continuous fiber dispersing and mixing extrusion apparatus of the embodiments, and those skilled in the art can combine and optimize the arrangement of the components according to the technical purpose:

a fiber reel 406 with an outer diameter of 80mm can wind 1000m of fiber bundle.

A driven wheel 402 with an outer diameter of 60 mm.

A driving wheel 403 with an outer diameter of 30mm and teeth of 5 m.

The rotary tape selects a model 405 of 5 m.

The stepping motor 404 is selected from 57 series, a communication module is arranged in a controller of the stepping motor, profinet communication is supported, the printing speed and the rotating speed of the extruder can be read, and the rotating speed of the stepping motor is controlled according to the parameters and the change of the outer diameter of the wire coil.

The tray support 401 is made of 6061 series aluminum row and is fixedly connected with the driving device 301.

The driving device 301 adopts a 110 servo motor and has the torque of 4N/M, and drives the extrusion screw 302 through an 1/12 planetary reducer.

The extrusion screw 302 has the rotation speed of 0-60RPM, the length of 600mm, the outer diameter of 30mm, the screw pitch of 24, is an equidistant deepening screw, and the compression ratio is 1: 2.

The barrel 305 has an outer diameter of 60mm and a length of 650 mm.

The extrusion screw and the material cylinder are both made of 38CrMoAl through nitriding treatment.

The 3D printing extruder hopper 304 has a capacity of 8L.

The 3D printing extrusion material 5 is PLA particle material, and the diameter of the material is 1.8-2.5 mm.

The heating ring 306 is a temperature sensing heating integrated type, 3 heating rings are arranged on the charging barrel 305, the length of each heating ring is 120mm, and the set temperature is 150 ℃, 210 ℃ and 190 ℃ from top to bottom.

The 3D printing extrusion nozzle 303 has a diameter of 12 mm. The discharge hole of the mixing nozzle 1 is circular in section and 8mm in inner diameter. The melt channel 101 has a length of 50mm and a square cross section of 10 × 10 mm. The printing material flows through the melt channel 101 from the 3D printing extrusion nozzle 303 to the discharge opening of the mixing nozzle 1 over a distance of 80 mm.

The fiber bundle yarn 6 is formed by weaving 1000 carbon fiber yarns with the outer diameter of about 7 um.

The inner diameter of a wire feeding pipe 2 in the mixing nozzle 1 is 1mm, the wall thickness is 0.1mm, and the number of the wire feeding pipes is 7. The distance between the filament outlet of the filament feeding pipe 2 and the discharge hole of the nozzle 1 is 2 mm.

In operation, the stepping motor 404 drives the driving wheel 403 to rotate, all the driven wheels 402 are driven by the synchronous rotating belt 405 to synchronously rotate, the driven wheels 402 drive the fiber discs 406 thereon to rotate, and the fiber bundles on the upper ends of the fiber discs 406 are led into the fiber feeding pipe 2. The stepping motor can adjust the rotating speed according to the extrusion amount and the printing speed of the extruder 3.

3D printing granular materials 5 are filled in a hopper 304 of the extruder 3, the lower portion of the hopper 304 is communicated with a feeding hole of a material barrel 305, a driving device 301 drives an extrusion screw 302 to extrude the printing materials 5 downwards, a heating ring 306 reaches a preset temperature, the materials 5 are heated, melted and compressed to reach an extrusion nozzle 303 of the 3D printing extruder, the extrusion nozzle 303 is communicated with a melting flow channel 101, and the materials 5 continuously flow through the melting flow channel 101 to reach a mixing cavity 103 of a mixing nozzle 1.

At the mixing cavity 103, the molten and flowing printing material 5 surrounds the filament feeding pipes 2, and wraps each fiber strand uniformly coming out from each filament feeding pipe 2, and the continuous and uniformly dispersed fiber strands 1 and the molten material 5 are continuously extruded from the discharge port of the mixing nozzle 1 under the action of extrusion force and dragging force.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A continuous fiber mixing nozzle is characterized in that: the printing material mixing device comprises a nozzle (1) and a wire feeding pipe (2), wherein the nozzle (1) comprises a melting flow channel (101), a wire pipe channel (102) and a mixing cavity (103), and the melting flow channel (101) is communicated with the mixing cavity (103) and is used for introducing printing materials; the wire feeding pipe (2) is arranged in the wire pipe channel (102), and a wire guiding opening of the wire feeding pipe (2) is communicated with the outside of the nozzle (1).

2. The continuous fiber mixing nozzle as defined in claim 1 wherein: the plurality of wire tube channels (102) are respectively and independently and uniformly distributed on the upper part of the nozzle (1); the wire feeding pipes (2) are arranged in the wire pipe channel (102) respectively, and the contact part of the wire feeding pipes (2) and the wire pipe channel (102) is sealed.

3. The continuous fiber mixing nozzle as defined in claim 2, wherein: the number of the wire tube channels (102) and the number of the wire feeding tubes (2) are respectively 1-16.

4. The continuous fiber mixing nozzle as defined in claim 1 wherein: the horizontal height difference between the wire outlet of the wire feeding pipe (2) and the discharge hole of the nozzle (1) is-6 mm.

5. The continuous fiber mixing nozzle as defined in claim 4 wherein: the horizontal height difference between the wire outlet of the wire feeding pipe (2) and the discharge hole of the nozzle (1) is 0-6 mm.

6. A continuous fiber dispersing and mixing extrusion device is characterized in that: comprising a continuous fiber mixing nozzle according to any of claims 1 to 5, an extruder (3) and a filament feeding tray (4), said filament feeding tray (4) being arranged above the filament feeding tubes (2) for introducing filaments into the respective filament feeding tubes (2); the extruder (3) is connected with a continuous fiber mixing nozzle and is used for inputting printing materials into the melting flow channel (101).

7. The continuous fiber dispersing and mixing extrusion apparatus according to claim 6, wherein: extruder (3) including drive arrangement (301), extrusion screw (302), extrude nozzle (303), hopper (304), feed cylinder (305) and heating circle (306), extrusion screw (302) locate in feed cylinder (305), the discharge gate of hopper (304) and the feed inlet intercommunication of feed cylinder (305), drive arrangement (301) be connected with extrusion screw (302), extrusion nozzle (303) and the discharge gate intercommunication of feed cylinder (305), heating circle (306) locate feed cylinder (305) lateral wall, the discharge gate of extrusion nozzle (303) and continuous fibers compounding nozzle's melt runner (101) intercommunication.

8. The continuous fiber dispersing and mixing extrusion apparatus according to claim 6, wherein: cellosilk feed dish (4) include charging tray support (401), follow driving wheel (402), action wheel (403), motor (404) and rotation area (405), follow driving wheel (402), action wheel (403) and motor (404) locate charging tray support (401) respectively on, rotation area (405) cover locate from driving wheel (402) and action wheel (403) on, motor (404) be used for driving action wheel (403), follow driving wheel (402) be used for settling the cellosilk dish.

9. A3D printer, includes the nozzle, its characterized in that: the nozzle is a continuous fiber mixing nozzle as claimed in any one of claims 1 to 5.

10. A 3D printer comprising an extrusion device, wherein the extrusion device is the continuous fiber dispersive mixing extrusion device of any one of claims 6 to 8.