阅读说明：本技术 一种fdm打印机喷头及应用其的3d打印机 (FDM print head and 3D printer using same ) 是由 贺云 林慧刚 李泽彬 于 2021-01-05 设计创作，主要内容包括：本发明公开了一种FDM打印机喷头及应用其的3D打印机,该FDM打印机喷头包括电机、送料组件、散热器、加热块、挤出喷嘴,其还进一步包括有喉管组件,所述喉管组件包括由具有良好耐高温且阻隔热传导的材料制作而成的喉管及装定件,所述喉管通过所述装定件装设在所述散热器与所述加热块之间,所述喉管上端面与所述散热器之间留有间隙；所述电机带动所述送料组件,将材料通过所述喉管送至所述加热块,通过所述挤出喷嘴挤出。本发明的喉管采用具有耐高温、隔热良好且自润滑的材料或铁氟龙材料制成,大大减少了通过喉管的热传导,使加热块以上部分的进料通道温度都足够低,保证材料不被软化,送进的低硬度高弹性材料在进入加热块之前都能够有效的传递。(The invention discloses an FDM printer nozzle and a 3D printer using the same, wherein the FDM printer nozzle comprises a motor, a feeding assembly, a radiator, a heating block and an extrusion nozzle, and further comprises a throat pipe assembly, the throat pipe assembly comprises a throat pipe and a fixing piece, the throat pipe is made of a material which has good high temperature resistance and can obstruct heat conduction, the throat pipe is arranged between the radiator and the heating block through the fixing piece, and a gap is reserved between the upper end surface of the throat pipe and the radiator; the motor drives the feeding assembly to send materials to the heating block through the throat pipe, and the materials are extruded out through the extrusion nozzle. The throat pipe is made of a material with high temperature resistance, good heat insulation and self lubrication or a teflon material, so that heat conduction through the throat pipe is greatly reduced, the temperature of a feeding channel above a heating block is low enough, the material is ensured not to be softened, and the fed low-hardness high-elasticity material can be effectively transferred before entering the heating block.)

1. The utility model provides a FDM print head, includes motor (1), pay-off subassembly (2), radiator (3), heating block (4), extrudes nozzle (5), its characterized in that: the heat radiator further comprises a throat pipe assembly (6), wherein the throat pipe assembly (6) comprises a throat pipe (61) and a fixing piece (62), the throat pipe (61) is made of a material which has good high temperature resistance and can block heat conduction, the throat pipe (61) is arranged between the heat radiator (3) and the heating block (4) through the fixing piece (62), and a gap is reserved between the upper end face of the throat pipe (61) and the heat radiator (3); the motor (1) drives the feeding assembly (2) to convey materials (7) to the heating block (4) through the throat pipe (61) and extrude the materials through the extrusion nozzle (5).

2. An FDM printer nozzle according to claim 1, wherein said setter (62) comprises a set of screws (621), said set of screws (621) being connected at one end to said heat sink (3) and at the other end to said heater block (4).

3. An FDM printer nozzle according to claim 2, in which said setter (62) further comprises a set screw (622), said set screw (622) passing through said heater block (4) to abut against said screw (621).

4. An FDM printer nozzle and 3D printer with the same as in claim 3 wherein, the screw (621) is provided with a recess, and the set screw (622) passes through the heating block (4) and is located at the recess.

5. An FDM printer nozzle as defined in any one of claims 1 to 4 wherein the throat (61) is made of a material that is high temperature resistant, thermally well insulating and self lubricating.

6. An FDM printer nozzle as defined in claim 5 wherein the throat (61) is made of Teflon material.

7. An FDM printer nozzle according to claim 6, in which said feed assembly (2) is located above said heat sink (3).

8. An FDM printer nozzle according to claim 7, characterised in that said feed assembly (2) comprises two feed wheels: an active feeding wheel (21) and a passive feeding wheel (22); the driving feeding wheel (21) is connected with an output shaft of the motor (1), the material (7) is just positioned between the driving feeding wheel (21) and the driven feeding wheel (22), and the material moves forwards under the driving of the driving feeding wheel (21) and the driven feeding wheel (22).

9. An FDM printer nozzle according to claim 8, in which said active feed wheel (21) is a toothed gear.

10. An FDM printer nozzle according to claim 9, in which the passive feed wheel (22) has a groove (221) in the middle.

11. An FDM printer nozzle according to claim 8, characterised in that the top surface of the heat sink (3) is formed with an arc structure, the arc structure is formed with two arc segments, the two arc segments are adapted to the outer contours of the driving feed wheel (21) and the driven feed wheel (22), respectively, and the outer contour shape of the arc tip at the junction of the two arc segments is exactly matched to the gap formed between the two feed wheels.

12. An FDM printer nozzle according to claim 1, characterised in that the heat sink (3) is externally provided with two fans (8) for convection cooling which wrap the heat sink (3).

13. An FDM printer nozzle according to claim 12, characterised in that said two fans for convection cooling are, respectively, a blowing fan (81) for inlet air and an extractor fan (82) for outlet air.

14. An FDM printer nozzle according to claim 13, in which a wind scooper (821) is mounted below said id fan (82).

15. A 3D printer, characterized in that it comprises an FDM printer head of any of claims 1-14.

Technical Field

The invention relates to the technical field of 3D printing, in particular to an FDM printer nozzle and a 3D printer using the same.

Background

FDM (fused Deposition modeling) in 3D printing is a process Fused Deposition Manufacturing (FDM) process. The material for FDM is typically a thermoplastic material such as wax, ABS, nylon, etc. supplied in filament form and heated to melt in a spray head. The spray head moves along the section contour and filling track of the part, and simultaneously extrudes out the molten material, and the material is rapidly solidified and coagulated with the surrounding material. The current FDM printer adopts far-end pay-off mostly, and the shower nozzle is kept away from to the pay-off motor, can't send soft material to the shower nozzle, consequently can only print hard material mostly, like PLA, ABS etc. the printer of a small number of near-end pay-offs, because the feedstock channel temperature is higher, and the route design of sending a wire of material is unreasonable, also can only adopt shore hardness to print at the high rigidity thermoplastic elastomer material more than 80A.

Disclosure of Invention

The invention aims to provide an FDM printer nozzle and a 3D printer using the same, which can overcome the defects and can perform 3D printing by adopting a high-elasticity material with the Shore hardness of below 80A.

In order to achieve the purpose, the invention adopts the following technical scheme:

an FDM printer nozzle comprising: the throat pipe assembly comprises a throat pipe and a fixing piece, wherein the throat pipe is made of a material with good high temperature resistance and heat conduction resistance, the throat pipe is arranged between the radiator and the heating block through the fixing piece, and a gap is reserved between the upper end surface of the throat pipe and the radiator; the motor drives the feeding assembly to send materials to the heating block through the throat pipe, and the materials are extruded out through the nozzle.

Preferably, the fixing piece comprises a set of screws, one end of each set of screws is connected with the radiator, and the other end of each set of screws is connected with the heating block.

Preferably, the setter further comprises a set screw, and the set screw passes through the heating block and abuts against the screw.

Preferably, a recess is arranged on the screw, and the set screw passes through the heating block and is just positioned at the recess.

Preferably, the throat pipe is made of a material with high temperature resistance, good heat insulation and self-lubrication.

Preferably, the throat is made of teflon.

Preferably, the feeding assembly is arranged above the radiator.

Preferably, the feeding assembly comprises two feeding wheels: the driving feeding wheel and the driven feeding wheel; the driving feeding wheel is connected with an output shaft of the motor, and materials are just positioned between the driving feeding wheel and the driven feeding wheel and move forwards under the driving of the driving feeding wheel and the driven feeding wheel.

Preferably, the driving feed wheel is a toothed gear.

Preferably, a groove is formed in the middle of the driven feeding wheel.

Preferably, an arc structure is formed on the upper surface of the radiator, two arc sections are formed on the arc structure, the two arc sections are respectively adapted to the outer contours of the driving feeding wheel and the driven feeding wheel, and the outer contour shape of an arc tip at the joint of the two arc sections is just matched with a gap formed between the two feeding wheels correspondingly.

Preferably, two fans for heat dissipation by convection are installed outside the heat sink.

Preferably, the two fans for convection heat dissipation are respectively a blowing fan for air intake and an exhaust fan for air exhaust.

Preferably, a wind scooper is installed under the induced draft fan.

The invention also provides a 3D printer which comprises all the FDM printer nozzles.

After the technical scheme is adopted, the motor device realizes near-end feeding in the printer nozzle, can feed high-elasticity materials with Shore hardness below 80A, the throat pipe is made of Teflon materials with good high temperature resistance and heat insulation function, a gap is reserved between the upper end face of the throat pipe and the radiator, heat conduction through the throat pipe is greatly reduced, the temperature of the whole feeding channel is greatly reduced, the materials are prevented from being softened, the temperature of the parts above the heating block is low enough, and the fed low-hardness high-elasticity materials can be effectively transferred before entering the heating block.

Drawings

FIG. 1 is an assembly view of the present invention;

FIG. 2 is a diagram of the operation of the present invention;

FIG. 3 is an assembly view of the heat sink and two fans of the present invention;

FIG. 4 is a schematic view of two fan-wrapped radiators of the present invention;

fig. 5 is a top view of the passive feed wheel of the present invention.

Detailed Description

In order to make the technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; may be directly connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The first embodiment is as follows:

as shown in fig. 1, the present invention provides an FDM printer nozzle, which comprises a motor 1, a feeding component 2, a heat sink 3, a heating block 4, an extrusion nozzle 5, and a throat component 6;

in the present embodiment, as shown in fig. 1 and 5, the feeding assembly 2 is disposed above the heat sink 3, and the feeding assembly 2 includes two feeding wheels: an active feeding wheel 21 and a passive feeding wheel 22; the driving feeding wheel 21 is connected with an output shaft of the motor 1. The driving feeding wheel 21 is a toothed gear; the driven feeding wheel 22 is provided with a groove 221 in the middle.

The upper surface of radiator 3 is formed with the arc structure, the arc structure is formed with two segmental arcs, two segmental arcs suit with initiative feeding wheel 21, passive feeding wheel 22's outline respectively, and the arc point outline shape of two segmental arc junctions corresponds the clearance that matches just in forming between two feeding wheels, the arc structure that the upper surface of radiator 3 formed accomplishes minimum with its clearance with two feeding wheels, make whole feedstock channel close to seal and be unobstructed straightly, material 7 can not the off tracking when adopting the high elasticity material of shore hardness below 80A to print, and be favorable to the transmission of power during the pay-off.

As shown in fig. 3 and 4, two fans for convection heat dissipation are mounted outside the heat sink 3, and the two fans for convection heat dissipation wrap the heat sink 3. The two fans are respectively a blowing fan 81 for air intake and an exhaust fan 82 for air exhaust; the air guide cover 821 is installed below the induced draft fan 82, and the air guide cover 821 guides the hot air extracted by the induced draft fan 82 out, so that the temperature of the radiator 3 and the temperature of the feeding channel are further reduced.

As shown in fig. 1, the throat assembly 6 includes a throat 61 made of a material with high temperature resistance, good heat insulation and self-lubrication, and a fixing member 62; in the present embodiment, the throat 61 is made of teflon.

The throat 61 is arranged between the radiator 3 and the heating block 4 through a fixing piece 62, and the throat 61 is connected with the heating block 4 through self threads; a gap is reserved between the upper end surface of the throat pipe 61 and the radiator 3;

the setter 62 includes: a screw 621 and a set screw 622, wherein one end of the screw 621 is connected with the heat radiator 3, and the other end is connected with the heating block 4; the set screw 622 passes through the heating block 4 and abuts on the screw 621. The screw 621 is provided with a recess, the set screw 622 passes through the heating block 4 and is just positioned at the recess, the screw 621 is prevented from loosening when passing through the heating block 4 and being connected with the radiator 3, the positioning of the heating block 4 and the radiator 3 is reinforced, and a gap is reserved between the upper end surface of the throat 61 and the radiator 3, so that the throat 61 is not stressed by the pressure on the shaft, the throat is ensured not to deform in the use process, the heat conduction through the throat is greatly reduced, and the material is ensured not to be softened.

As shown in fig. 2, the present invention is a near-end feeding method, after a printer nozzle is installed, a high elastic material with shore hardness below 80A can be used for printing, a motor 1 drives a feeding component 2, a material 7 is sent to a heating block 4 through a throat 61 made of a material with high temperature resistance, good heat insulation and self-lubrication, and is extruded through an extrusion nozzle 5;

the motor 1 is started, and the material 7 is just positioned between the driving feeding wheel 21 and the driven feeding wheel 22; the toothed gear of the driving feeding wheel 21 increases the biting force on the material 7, the groove 221 in the middle of the driven feeding wheel 22 enables a part of the material 7 to be sunk in the groove 221, the material 7 is positioned in a feeding mode, the material 7 does not slide, the downward advancing route is more accurate, and the driving force for the downward advancing of the material 7 is increased through the meshing of the driving feeding wheel 21 and the positioning of the driven feeding wheel 22.

The material 7 starts to move downwards under the driving of the driving feeding wheel 21 and the driven feeding wheel 22, and the material 7 can not deviate and directly enters the radiator 3 because an arc-shaped structure formed on the upper surface of the radiator 3 is matched with the shapes of the two feeding wheels; the heat is separated by the throat 61 made of a high-temperature-resistant, good-heat-insulation and self-lubricating material below the radiator 3, the separated heat is conducted to the radiator 3 and wraps the two fans used for heat convection of the radiator 3, and the hot air of the radiator 3 is blown to the exhaust fan by the blowing fan and guided out through the air guide cover 821 to be hot air, so that the material 7 cannot be softened in advance in a channel of the radiator 3.

The throat 61 is not only high temperature resistant and good in heat insulation, but also has a self-lubricating function, after the material 7 smoothly enters the throat 61 from the channel of the radiator 3, the throat 61 made of the material with high temperature resistance, good heat insulation and self-lubricating enables the material 7 to smoothly and quickly pass through the throat 61 channel with high temperature resistance, good heat insulation and lubrication, in the embodiment, the throat 61 made of the Teflon material with high temperature resistance, good heat insulation and lubrication enables the temperature of the feeding channel above the heating block 4 to be low enough, so that the material 7 can be effectively transmitted by the thrust of the driving feeding wheel 21 and the driven feeding wheel 22, smoothly moves downwards until entering the heating block 4, and is finally extruded from the extrusion nozzle 5.

Example two:

the invention also provides a 3D printer which comprises the FDM printer nozzle in the first embodiment.

The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the invention is not to be considered limited to those descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.