CN111469399A

CN111469399A - 3D printing nozzle

Info

Publication number: CN111469399A
Application number: CN202010295539.XA
Authority: CN
Inventors: 戴莹; 杨陈
Original assignee: Jiangxi Institute of Fashion Technology
Current assignee: Jiangxi Institute of Fashion Technology
Priority date: 2020-04-15
Filing date: 2020-04-15
Publication date: 2020-07-31

Abstract

The invention relates to the technical field of 3D printing, in particular to a 3D printing nozzle which comprises a body, wherein a first feeding cavity is formed in the body, and a first feeding hole is formed in the side wall of the body; a first piston plate disposed within the first feed chamber; one end of the spray pipe is connected with the first piston plate, and the other end of the spray pipe can extend out of the body; piston assembly, gliding setting is in first feeding intracavity, enclose into sealed second feeding chamber with first piston plate, spray tube and second feeding chamber intercommunication, be equipped with on piston assembly's the lateral wall with first feed inlet complex second feed inlet, piston assembly receives drive assembly's drive to remove in first feeding intracavity, make first feed inlet and second feed inlet coincidence or stagger, when first feed inlet staggers with the second feed inlet, the increase of distance between piston assembly and the first piston plate. The printing nozzle is not easy to block, the printing efficiency is high, and the processing quality of a printed product is good.

Description

3D printing nozzle

Technical Field

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

Background

The technical contents of the existing 3D printer mainly include: and inputting a software data instruction to control the 3D printer, heating and melting the filamentous hot-melt material, and extruding the material through a printing nozzle and then solidifying the material. The hot melt material is sprayed out from the spray head after being melted, is deposited on the printing workbench panel or the solidified material of the previous layer, starts to solidify after the temperature is lower than the solidification temperature, and forms a final finished product through layer-by-layer accumulation of the material. In the prior art, when a nozzle of a 3D printer is used for outputting and printing, the problem of nozzle blockage generally exists, and when the 3D printer is stopped or stops spraying materials, the nozzle is easy to cause material sagging and solidification, so that the nozzle is blocked and subsequent printing is influenced; the shower nozzle needs to be manually cleaned, time and labor are consumed, the printing efficiency is influenced, and meanwhile, the solidified sagging material is easy to rub a printed piece, so that the processing quality of the printed piece is influenced.

Disclosure of Invention

Therefore, the 3D printing nozzle provided by the invention overcomes the defects that the existing 3D printing nozzle is easy to block, the printing efficiency is low and the processing quality is influenced in the prior art, and has the advantages of difficulty in blocking, high printing efficiency and good processing quality of a printed product.

In order to solve the above problems, the present invention provides the following technical solutions: A3D printing nozzle comprises a body, a first feeding hole and a second feeding hole, wherein the first feeding hole is formed in the body; a first piston plate disposed within the first feed chamber; one end of the spray pipe is connected with the first piston plate, and the other end of the spray pipe can extend out of the body; the piston assembly is arranged in the first feeding cavity in a sliding mode and surrounds the first piston plate to form a sealed second feeding cavity, the spray pipe is communicated with the second feeding cavity, a second feeding hole matched with the first feeding hole is formed in the side wall of the piston assembly, the piston assembly is driven by the driving assembly to move in the first feeding cavity, the first feeding hole is overlapped with or staggered with the second feeding hole, and when the first feeding hole is staggered with the second feeding hole, the distance between the piston assembly and the first piston plate is increased.

Preferably, the piston assembly is of a cylindrical structure.

Preferably, the first piston plate is movably arranged in the first feeding cavity, at least one limiting connecting rod is connected between the piston assembly and the first piston plate, and the piston assembly drives the first piston plate to move after a set distance is formed between the piston assembly and the first piston plate.

Preferably, the limit connecting rod is of an L-type structure, the limit connecting rod is fixedly connected with the piston assembly, and the limit connecting rod hooks the first piston plate after the distance between the piston assembly and the first piston plate is greater than a set distance.

Preferably, at least one elastic element and at least one stopper are arranged between the side of the first piston plate, which is far away from the piston assembly, and the body.

Preferably, still include both ends and fix diaphragm on the body, be equipped with the confession on the piston assembly the groove of stepping down that the diaphragm was worn to establish, the correspondence of diaphragm the channel position of spray tube is provided with first sealed the pad, the spray tube is followed first piston plate remove can with first sealed butt that fills up.

Preferably, the body is provided with a feeding hole and a discharging hole which are arranged in an outward extending mode, the feeding hole is communicated with the first feeding hole, the spraying pipe is arranged in the discharging hole in a penetrating mode, the outer side of the feeding hole and the outer side of the discharging hole are respectively provided with a first heating portion and a second heating portion, and the outer portions of the first heating portion and the second heating portion are respectively provided with a heat insulation layer.

Preferably, the first heating part is further disposed outside the first feeding cavity.

Preferably, a temperature measuring element is further arranged on the first piston plate, and one end of the temperature measuring element extends into the second feeding cavity.

Preferably, the body is further provided with at least one first vent hole and at least one second vent hole communicated with the first feeding cavity, and the first vent hole and the second vent hole are respectively located on two sides of the first piston plate and the piston assembly.

The technical scheme of the invention has the following advantages:

the body provided by the invention is internally provided with a first feeding cavity, and the side wall of the body is provided with a first feeding hole; a first piston plate disposed within the first feed chamber; one end of the spray pipe is connected with the first piston plate, and the other end of the spray pipe can extend out of the body; the piston assembly is arranged in the first feeding cavity in a sliding mode and forms a sealed second feeding cavity with the first piston plate in a surrounding mode, the spray pipe is communicated with the second feeding cavity, a second feeding hole matched with the first feeding hole is arranged on the side wall of the piston assembly, the piston assembly is driven by the driving assembly to move in the first feeding cavity, so that the first feeding hole and the second feeding hole are overlapped or staggered, when the first feed inlet and the second feed inlet are staggered, the distance between the piston assembly and the first piston plate is continuously increased, and a certain negative pressure is formed in a second feed cavity defined by the piston assembly and the first piston plate, therefore, the printing raw material in the spray pipe can be effectively pumped into the second feeding cavity, the printing raw material is not easy to block after being cooled, and the printing raw material is effectively prevented from solidifying and sagging; when the piston assembly continues to ascend, the spray pipe can move along with the first piston plate and can be in sealing butt joint with the first sealing gasket, and two ends of the first sealing element are fixed on the transverse plate on the body and are fixedly connected with the transverse plate, so that printing raw materials in the spray pipe are further prevented from continuously flowing out due to original feeding pressure; the second heating part is arranged on the outer side of the spray pipe and is used for heating the spray pipe to melt the residual printing raw materials in the spray pipe, so that the residual printing raw materials are not easy to block, the solidification and sagging of the printing raw materials are effectively prevented, the spray pipe does not need to be cleaned manually, the cleaning time is saved, and the printing effect is improved; the solidified sagging materials are reduced from being rubbed on the printed piece, and the processing quality of the printed piece is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a front view cross-sectional illustration of a 3D print head provided in one embodiment of the invention;

FIG. 2 is a schematic view of the 3D printing head shown in FIG. 1 during operation;

FIG. 3 is a schematic diagram of a top view of FIG. 1;

description of reference numerals:

1-body; 2-a first feed chamber; 3-a first feed port; 4-a first piston plate; 5-spraying a pipe; 6-a piston assembly; 7-a second inlet chamber; 8-a second vent; 9-a second feed port; 10-a drive assembly; 11-a limit connecting rod; 12-a resilient element; 13-a transverse plate; 14-a first gasket; 15-a abdication groove; 16-a feed inlet; 17-a discharge hole; 18-a first heating section; 19-a thermal insulation layer; 20-a temperature measuring element; 21-a first vent; 22-a second heating section; 23-a chamber cover; 24-electric heating wire; 25-a limit piece; 26-a second seal; 27-third feed port.

Detailed Description

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

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Fig. 1 to 3 show a specific embodiment of a 3D printing head, which includes a body 1, a first feeding cavity 2 is provided in the body 1, specifically, a cavity cover 23 is provided on the body 1, the cavity cover 23 is connected to the body 1 through screws, and the cavity cover 23 and the body 1 enclose the first feeding cavity 2; the first feeding cavity 2 is particularly of a cylindrical structure. The body 1 is provided with a feeding hole 16 and a discharging hole 17 which extend outwards, the side wall of the body 1 is provided with a first feeding hole 3, and the feeding hole 16 is communicated with the first feeding hole 3.

As shown in fig. 1 and 2, the first piston plate 4 is movably disposed in the first feeding cavity 2, the first piston plate 4 is connected with the inner wall of the first feeding cavity 2 in a sliding and sealing manner through a second sealing member 26, two elastic elements 12 and two limiting members 25 are disposed between one side of the first piston plate 4, which is far away from the piston assembly 6, and the body 1, the elastic elements 12 are specifically helical springs, the nozzle 5 has one end connected with the first piston plate 4 and the other end capable of extending out of the body 1, the nozzle 5 is disposed through the discharge port 17, the elastic elements 12 and the limiting members 25 are disposed at two sides of the nozzle 5, the piston assembly 6 is a cylindrical structure, the nozzle 6 is slidably disposed in the first feeding cavity 2 and connected with the first feeding cavity 2 in a sliding and sealing manner through the second sealing member 26, the piston assembly 6 and the first piston plate 4 enclose a sealed second feeding port 7, the nozzle 5 is communicated with the second feeding cavity 7, the piston assembly 6 is connected with the second feeding port 353 through the second sealing member 26, and a nozzle assembly 16 is disposed between the first piston plate and the nozzle assembly 11, and the nozzle assembly 11 are disposed on two sides, and a nozzle assembly, and a print head is disposed on the side of the nozzle assembly.

As shown in fig. 1 and 2, transverse plates 13 are fixed at two ends of the body 1, a recess 15 is formed in the piston assembly 6 for the transverse plates 13 to penetrate through, and first sealing gaskets 14 are arranged at the passage positions of the transverse plates 13 corresponding to the spray pipes 5.

As shown in fig. 2 and 3, the piston assembly 6 is driven by the driving assembly 10 to move in the first feeding cavity 2, the driving assembly 10 is fixed on the cavity cover 23, and specifically may be an electric telescopic rod, an output end of the electric telescopic rod extends into the first feeding cavity 2 and is connected with the piston assembly 6, so that the first feeding port 3 coincides with or is staggered with the second feeding port 9, when the first feeding port 3 is staggered with the second feeding port 9, a distance between the piston assembly 6 and the first piston plate 4 is increased, and after the distance between the piston assembly 6 and the first piston plate 4 is greater than a set distance, the limit connecting rod 11 hooks the first piston plate 4. Specifically, as shown in fig. 2, when the 3D printing head is in an operating state, the driving assembly 10 drives the piston assembly 6 to move towards the first piston plate 4, and when the first feed port 3, the second feed port 9, and the third feed port 27 are aligned and communicated with the feed port 16 when the 3D printing head is in operation, the first feed cavity 2, the second feed cavity 7, and the nozzle 5 are communicated to perform a 3D printing operation, where the 3D printing is additive manufacturing; meanwhile, the limiting member 25 abuts against the body 1 to prevent the piston assembly 6 from further moving towards the first piston plate 4, so that the volume of the inner cavity of the second feeding cavity 7 is kept unchanged, and the printing raw material output by the spray pipe 5 is in a stable state. When the 3D printing nozzle is converted into a non-working state, the driving assembly 10 drives the piston assembly 6 to be far away from the first piston plate 4, so that the distance between the piston assembly 6 and the first piston plate 4 is increased, the first feed port 3 and the second feed port 9 are staggered, and at this time, the second feed cavity 7 enclosed by the piston assembly 6 and the first piston plate 4 forms a certain negative pressure, so that printing raw materials in the spray pipe 5 can be effectively pumped into the second feed cavity 7, when the piston assembly 6 continuously ascends, the distance between the piston assembly 6 and the first piston plate 4 is larger than a set distance, the limit connecting rod 11 hooks the first piston plate 4, the spray pipe 5 can move along with the first piston plate 4 and can be in sealing and abutting joint with the first sealing gasket 14, and the first sealing element is fixed on the transverse plate 13 on the body 1 at two ends, at this time, the first feeding hole 3 and the second feeding hole 9 are completely staggered and are not communicated with each other, so that the printing raw materials in the spray pipe 5 are further prevented from continuously flowing out due to the original feeding pressure.

As shown in fig. 1 and 2, a first heating part 18 and a second heating part 22 are respectively disposed outside the inlet 16 and the outlet 17, and the first heating part 18 is further disposed outside the first inlet chamber 2. Heating wires 24 are arranged in the first heating part 18 and the second heating part 22, and the first heating part 18 keeps the printing raw materials in the first feeding cavity 2 and the second feeding cavity 7 at a set temperature, so that instability of printing quality caused by overhigh temperature or overlow temperature is effectively prevented. The second heating part 22 heats the spray pipe 5, melts the residual printing raw materials in the spray pipe 5, is not easy to block, effectively prevents the printing raw materials from solidifying and sagging, does not need to manually clean the spray pipe 5, saves cleaning time and improves printing effect; the solidified sagging materials are reduced from being rubbed on the printed piece, and the processing quality of the printed piece is improved. The heat insulating layers 19 are respectively disposed outside the first heating unit 18 and the second heating unit 22, so that heat exchange between the first heating unit 18 and the second heating unit 22 and the outside is prevented, and the work efficiency of the first heating unit 18 and the second heating unit 22 is improved.

As shown in fig. 1 and 2, a temperature measuring element 20 is further disposed on the first piston plate 4, one end of the temperature measuring element 20 extends into the second feeding cavity 7, and the temperature measuring element 20 is specifically a temperature sensing probe for monitoring the temperature of the printing material entering the first feeding cavity 2 and the second feeding cavity 7.

As shown in fig. 1 and 2, the body 1 is further provided with at least one first vent hole 21 and at least one second vent hole 8, which are communicated with the first feeding cavity 2, the first vent hole 21 and the second vent hole 8 are respectively located at two sides of the first piston plate 4 and the piston assembly 6, and the first vent hole 21 and the second vent hole 8 are communicated with the outside, so that the piston assembly 6 moves more smoothly in the first feeding cavity 2.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A3D printing nozzle is characterized by comprising,

the device comprises a body (1), a first feeding cavity (2) is formed in the body, and a first feeding hole (3) is formed in the side wall of the body (1);

a first piston plate (4) arranged within the first inlet chamber (2);

one end of the spray pipe (5) is connected with the first piston plate (4), and the other end of the spray pipe can extend out of the body (1);

piston assembly (6), gliding setting is in first feeding chamber (2), with first piston plate (4) enclose into sealed second feeding chamber (7), spray tube (5) with second feeding chamber (7) intercommunication, be equipped with on the lateral wall of piston assembly (6) with first feed inlet (3) complex second feed inlet (9), piston assembly (6) are in by the drive of drive assembly (10) remove in first feeding chamber (2), make first feed inlet (3) with coincidence of second feed inlet (9) or stagger first feed inlet (3) with when second feed inlet (9) stagger, piston assembly (6) with the distance increase between first piston plate (4).

2. 3D print head according to claim 1, characterized in that the piston assembly (6) is a cylindrical structure.

3. 3D printing head according to claim 1, wherein the first piston plate (4) is movably arranged in the first feeding chamber (2), at least one limit connecting rod (11) is connected between the piston assembly (6) and the first piston plate (4), and the piston assembly (6) drives the first piston plate (4) to move after a set distance between the piston assembly (6) and the first piston plate (4).

4. The 3D printing head according to claim 3, wherein the limit connecting rod (11) is L-type structure, the limit connecting rod (11) is fixedly connected with the piston assembly (6), and the limit connecting rod (11) hooks the first piston plate (4) after a distance between the piston assembly (6) and the first piston plate (4) is larger than a set distance.

5. The 3D printing head according to claim 4, characterized in that at least one elastic element (12) and at least one stop (25) are provided between the side of the first piston plate (4) remote from the piston assembly (6) and the body (1).

6. The 3D printing nozzle according to claim 3, further comprising a transverse plate (13) with two ends fixed on the body (1), wherein a recess (15) for the transverse plate (13) to penetrate is formed in the piston assembly (6), a first sealing gasket (14) is arranged at a channel position of the transverse plate (13) corresponding to the spray pipe (5), and the spray pipe (5) can be in sealing abutting joint with the first sealing gasket (14) along with the movement of the first piston plate (4).

7. The 3D printing nozzle according to claim 1, wherein the body (1) is provided with a feed inlet (16) and a discharge outlet (17) which extend outwards, the feed inlet (16) is communicated with the first feed inlet (3), the nozzle (5) is arranged through the discharge outlet (17), a first heating part (18) and a second heating part (22) are respectively arranged outside the feed inlet (16) and the discharge outlet (17), and a heat insulation layer (19) is respectively arranged outside the first heating part (18) and the second heating part (22).

8. The 3D printing head according to claim 7, characterized in that the first heating part (18) is also arranged outside the first inlet chamber (2).

9. 3D printing head according to claim 1, characterized in that a temperature measuring element (20) is also provided on the first piston plate (4), one end of the temperature measuring element (20) protruding into the second feeding chamber (7).

10. 3D printing head according to claim 1, wherein the body (1) is further provided with at least one first vent hole (21) and at least one second vent hole (8) communicating with the first feeding chamber (2), the first vent hole (21) and the second vent hole (8) being located on both sides of the first piston plate (4) and the piston assembly (6), respectively.