Extrusion head of 3D printer

Abstract

The utility model relates to the technical field of 3D printing, in particular to a 3D printer extruder head which comprises an outer shell, a partition plate used for separating a heating area and a heat dissipation area is arranged in an inner cavity of the outer shell, the heat dissipation area is provided with a spray head, the lower end of the spray head extends out of the outer shell, and a heat dissipation opening is formed in the side portion of the heat dissipation area. The lower end of the outer shell is open and provided with a first cooling fan, a rotor of the first cooling fan is hollow and is arranged on the spray head in a sleeving mode at intervals, and the bottom face of the first cooling fan is an air inlet end. The operation of the second heat dissipation fan enables external cold air to sequentially pass through the upper surface of the printed material and the heat dissipation area and finally be discharged through the heat dissipation opening in the side portion of the heat dissipation area, the effects of cooling the printed material and enabling the material to be rapidly cooled and solidified are achieved, and compared with the prior art, the weight is reduced, and the cost is reduced. Compared with the mode that the obliquely-arranged fans are additionally arranged on the side portion of the lower end of the machine head, the size is reduced, the number of the fans is reduced, and the weight is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, in particular to an extruder head of a 3D printer. Background Art

[0002] As is known, the extruder head of a 3D printer utilizes a heating component (including a heating resistor wire and a thermistor, etc.) to control the temperature rise to dissolve the consumables, and then sprays the dissolved material onto the model, completing the printing operation of the product by layer by layer.

[0003] When the existing 3D printer prints an object, the nozzle is very hot, so it is difficult for the ejected material to solidify at the set position in a short time, resulting in edges or distortions of the printed object. Although a cooling fan is provided on the side of the nozzle corresponding to the nozzle, which generates airflow radially perpendicular to the nozzle, this situation is still one of the reasons that restrict the printing efficiency. For this reason, the 3D printer in the prior art generally adds an inclined fan on the side of the lower end of the nozzle, and the airflow generated by the fan is blown to the position of the material just ejected; although this approach can speed up the solidification of the material, it also increases the weight and volume of the nozzle, and there are problems such as low air utilization and poor cooling effect.

[0004] To this end, we designed a 3D printer extruder head to address at least one of the above-mentioned deficiencies. Utility Model Content

[0005] In order to overcome the deficiencies in the background technology, the utility model discloses an extruder head for a 3D printer.

[0006] In order to achieve the above-mentioned invention object, the utility model adopts the following technical solutions:

[0007] A 3D printer extruder head comprises an outer shell, wherein the inner cavity of the outer shell is provided with a partition for separating a heating zone and a heat dissipation zone, the heat dissipation zone has a nozzle whose lower end extends out of the outer shell, and the side of the heat dissipation zone has a heat dissipation port; the lower end of the outer shell is open and is provided with a first heat dissipation fan, the rotor of the first heat dissipation fan is hollow and is spaced apart from the nozzle, and the bottom surface of the first heat dissipation fan is an air inlet end.

[0008] Preferably, the heating zone has a material conveying copper tube whose lower end is coaxially connected to the nozzle, and a heating component is provided on the body of the material conveying copper tube to facilitate melting of the wire.

[0009] Preferably, it also includes a mounting block, the outer shell is arranged on the bottom surface of the mounting block, the middle section of the mounting block is provided with an extrusion assembly, the upper section of the mounting block is provided with a feed port, the lower end of the mounting block is provided with a mounting through hole for fixing the upper section of the feed copper tube, and the feed port is coaxially arranged with the feed copper tube.

[0010] Preferably, the extrusion assembly includes an extrusion motor installed on one side of the mounting block, the extrusion motor output shaft fixing sleeve is provided with a driving wheel, one side of the driving wheel is provided with a driven wheel, and the driven wheel is rotatably connected to the mounting block, and there is a space between the driven wheel and the driving wheel for the wire to pass through.

[0011] Preferably, the driven wheel is a rigid wheel, and a wire groove is provided on the driven wheel body.

[0012] Preferably, the driving wheel is a flexible wheel.

[0013] Preferably, heat dissipation fins are provided on the side of the lower section of the mounting block.

[0014] Preferably, a second cooling fan is provided on the side of the lower section of the mounting block.

[0015] Preferably, it further comprises a mounting plate, wherein the mounting block is mounted on one side of the mounting plate surface, and the extruder motor is located on the side of the mounting block corresponding to the other side of the mounting plate.

[0016] Preferably, it also includes a guide cover, which is a funnel structure, the upper end of the guide cover is correspondingly connected to the periphery of the air inlet end of the first cooling fan, the lower end of the guide cover is spaced and sleeved on the periphery of the nozzle, and the lower end of the guide cover is higher than the lower end of the nozzle.

[0017] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0018] 1. The operation of the second cooling fan allows the external cold air to pass through the upper surface of the printed material and the heat dissipation area in turn, and finally be discharged through the heat dissipation port on the side of the heat dissipation area, thereby achieving the effect of cooling the printed material and quickly cooling and solidifying the material. Compared with the traditional technology, the weight is reduced. Compared with the method of adding an inclined fan on the side of the lower end of the head, the volume and the number of fans are reduced, that is, the weight is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 It is the front view of the utility model.

[0021] In the figure: 1. outer shell; 2. partition; 3. nozzle; 4. first cooling fan; 5. feed copper tube; 6. heating assembly; 7. mounting block; 71. cooling fins; 8. extrusion assembly; 81. extrusion motor; 82. driving wheel; 83. driven wheel; 9. second cooling fan; 10. mounting plate; 11. air guide cover. DETAILED DESCRIPTION

[0022] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present application, in order to facilitate the description of the present invention; it should be understood that if there are terms such as "end", "side", "end part", "lateral", "transverse", "longitudinal", etc. indicating directions or positional relationships, they only correspond to the length and width of the corresponding parts, that is, "end part" indicates the head and tail areas in the length direction of the corresponding part, and "side part" indicates the head and tail areas in the width direction of the corresponding part; this is for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction.

[0023] Embodiment 1, in combination with the attached Figure 1-2 A 3D printer extruder head comprises an outer shell 1, an inner cavity of the outer shell 1 is provided with a partition 2 for separating a heating zone and a heat dissipation zone, the heat dissipation zone has a nozzle 3 whose lower end extends out of the outer shell 1, and a heat dissipation port is provided on the side of the heat dissipation zone; the lower end of the outer shell 1 is open, and a first heat dissipation fan 4 is provided, the rotor of the first heat dissipation fan 4 is hollow, and is spaced and sleeved on the nozzle 3, and the bottom surface of the first heat dissipation fan 4 is an air inlet end.

[0024] Compared with the traditional technology, the original cooling fans arranged on the side walls of the cooling area are reduced (there are usually two on the opposite side walls of the cooling area), the bottom plate at the lower end of the outer shell 1 is removed, the first cooling fan 4 is newly added, and the air inlet where the original cooling fan is installed is changed to a cooling port, which reduces the weight as a whole. Compared with the method of adding an inclined fan on the side of the lower end of the head, the volume is reduced and the number of fans is reduced, that is, the weight is also reduced.

[0025] In this arrangement, during the printing process, the first cooling fan 4 is running, and the cold air from the outside passes through the upper surface of the printed material and flows to the air inlet end of the first cooling fan 4, passes through the air inlet end of the first cooling fan 4 and enters the heat dissipation zone, and finally is discharged through the heat dissipation port on the side of the heat dissipation zone. Since the cold air from the outside flows through the upper surface of the printed material, the printed material is cooled, so that the material is quickly cooled and solidified. It should be noted that since the cold air from the outside first flows through the upper surface of the printed material, the power of the first cooling fan 4 should increase the transmission power as needed to meet the requirements of cooling the nozzle 3.

[0026] Furthermore, the heating zone has a feeding copper tube 5 whose lower end is coaxially connected to the nozzle 3, and a heating assembly 6 is provided on the body of the feeding copper tube 5 to facilitate the melting of the wire; it also includes a mounting block 7, an outer shell 1 is arranged on the bottom surface of the mounting block 7, an extrusion assembly 8 is provided in the middle section of the mounting block 7, a feed port is provided in the upper section of the mounting block 7, a mounting through hole for fixing the upper section of the feeding copper tube 5 is provided at the lower end of the mounting block 7, and the feed port is coaxially arranged with the feeding copper tube 5. The extrusion assembly 8 includes an extrusion motor 81 installed on one side of the mounting block 7, a driving wheel 82 is provided on the output shaft fixing sleeve of the extrusion motor 81, a driven wheel 83 is provided on one side of the driving wheel 82, and the driven wheel 83 is rotatably connected to the mounting block 7, and there is a space for the wire to pass through between the driven wheel 83 and the driving wheel 82.

[0027] Specifically, it also includes a mounting plate 10, one surface of the mounting plate 10 is mounted with a mounting block 7, and the other surface of the mounting plate 10 is mounted with a slider structure, so that the mounting plate 10 can be moved on the 3D printer.

[0028] When in use, the wire is first passed through the feed port, then through the space between the driven wheel 83 and the driving wheel 82, and inserted into the feed copper tube 5. In the feed copper tube 5, it is heated and melted by the heating component 6 and then sprayed out through the nozzle 3.

[0029] Embodiment 2, combined with the attached Figure 1-2 , a 3D printer extruder head, based on the first embodiment, in order to ensure that the wire can be smoothly inserted into the feeding copper tube 5, the driven wheel 83 is a rigid wheel, and the driven wheel 83 is provided with a wire groove.

[0030] In one example, the driving wheel 82 can be a rigid wheel with a wire groove on the wheel body; or a flexible wheel. When the driving wheel 82 is a flexible wheel, the driving wheel 82 wheel body is not provided with a wire groove, and the friction between the driving wheel 82 and the wire is ensured by the deformation of the driving wheel 82.

[0031] When the driving wheel 82 is a flexible wheel, it can be understood that the driving wheel 82 is fixedly sleeved with a flexible sleeve, or it can be understood that the driving wheel 82 is a flexible sleeve directly fixedly sleeved on the output shaft of the extrusion motor 81.

[0032] In a specific example, when the wire diameter is 3.5mm, in order to meet the demand for large feed volume, the nozzle 3 adopts a nozzle with an aperture of 0.8-2.0mm. To further meet the requirements of high-speed printing, the extrusion motor 81 adopts a 1.8N*M high-torque 57 extruder motor, and the driven wheel 83 adopts a V1804 grooved bearing with a diameter of 25mm, which clamps the material more tightly and is more suitable for clamping 3.5mm wire diameter consumables, so that the number of rotations can be reduced during high-speed printing. Preferably, the heating component 6 adopts a 24V150W high-power heating tube, and its specifications can be 3*60mm, which heats the entire area from top to bottom to allow the consumables to melt more fully.

[0033] Embodiment 3, in combination with the attached Figure 1-2 A 3D printer extruder head, based on the first or second embodiment, in order to prevent the mounting block 7 from being "high temperature" due to the heat transmitted from the feeding copper tube 5 to the mounting block 7, a heat dissipation fin 71 is provided on the side of the lower section of the mounting block 7.

[0034] Furthermore, a second cooling fan 9 is provided at the side of the lower section of the mounting block 7. Preferably, the air outlet of the second cooling fan 9 faces the cooling fins 71.

[0035] Embodiment 4, in combination with the attached Figure 1-2 A 3D printer extruder head, based on any one of embodiments one to three, in order to ensure the force balance of the slider structure, a mounting block 7 is installed on one side of the mounting plate 10, and an extrusion motor 81 is located on the side of the mounting block 7 corresponding to the other side of the mounting plate 10.

[0036] Embodiment 5, in combination with the attached Figure 1-2 A 3D printer extruder head, based on any one of embodiments 1 to 4, in order to enable the external cold air flow to flow to the material just printed under the nozzle 3 as much as possible, also includes a guide cover 11, the guide cover 11 is a funnel structure, the upper end of the guide cover 11 is correspondingly connected to the periphery of the air inlet end of the first cooling fan 4, the lower end of the guide cover 11 is spaced and sleeved on the periphery of the nozzle 3, and the lower end of the guide cover 11 is higher than the lower end of the nozzle 3.

[0037] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the present invention.

Claims

1. A 3D printer extruder head, comprising an outer shell (1), wherein the inner cavity of the outer shell (1) is provided with a partition (2) for separating a heating zone and a heat dissipation zone, wherein: The heat dissipation zone has a nozzle (3) whose lower end extends out of the outer shell (1), and a heat dissipation port is provided on the side of the heat dissipation zone; the lower end of the outer shell (1) is open and is provided with a first heat dissipation fan (4); the rotor of the first heat dissipation fan (4) is hollow and is spaced apart from the nozzle (3), and the bottom surface of the first heat dissipation fan (4) is an air inlet end.

2. A 3D printer extruder head according to claim 1, characterized in that: The heating zone has a material conveying copper tube (5) whose lower end is coaxially connected to the nozzle (3), and the body of the material conveying copper tube (5) is provided with a heating component (6) to facilitate melting of the wire.

3. A 3D printer extruder head according to claim 2, characterized in that: It also includes a mounting block (7), the outer shell (1) is arranged on the bottom surface of the mounting block (7), the middle section of the mounting block (7) is provided with an extrusion assembly (8), the upper section of the mounting block (7) is provided with a feed port, the lower end of the mounting block (7) is provided with a mounting through hole for fixing the upper section of the feed copper tube (5), and the feed port and the feed copper tube (5) are coaxially arranged.

4. A 3D printer extruder head according to claim 3, characterized in that: The extrusion assembly (8) comprises an extrusion motor (81) mounted on one side of a mounting block (7); a driving wheel (82) is provided on the output shaft fixing sleeve of the extrusion motor (81); a driven wheel (83) is provided on one side of the driving wheel (82); the driven wheel (83) is rotatably connected to the mounting block (7); and a space for wire to pass through is provided between the driven wheel (83) and the driving wheel (82).

5. A 3D printer extruder head according to claim 4, characterized in that: The driven wheel (83) is a rigid wheel, and a wire groove is provided on the wheel body of the driven wheel (83).

6. A 3D printer extruder head according to claim 4, characterized in that: The driving wheel (82) is a flexible wheel.

7. A 3D printer extruder head according to claim 3, characterized in that: The lower side of the mounting block (7) is provided with heat dissipation fins (71).

8. A 3D printer extruder head according to claim 3, characterized in that: A second cooling fan (9) is provided on the side of the lower section of the mounting block (7).

9. A 3D printer extruder head according to claim 4, characterized in that: It also comprises a mounting plate (10), wherein the mounting block (7) is mounted on one side of the mounting plate (10), and the extruder motor (81) is located on the side of the mounting block (7) corresponding to the other side of the mounting plate (10).

10. A 3D printer extruder head according to claim 1, characterized in that: It also includes a guide cover (11), which is a funnel structure. The upper end of the guide cover (11) is correspondingly connected to the periphery of the air inlet end of the first cooling fan (4), and the lower end of the guide cover (11) is spaced apart and sleeved on the periphery of the nozzle (3), and the lower end of the guide cover (11) is higher than the lower end of the nozzle (3).

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