FDM 3D printing extrusion mechanism with hot runner

Abstract

The utility model relates to an FDM (fused deposition modeling) 3D (three-dimensional) printing extrusion mechanism with a hot runner, which belongs to the technical field of 3D printing, comprises an extruder bracket, and is characterized in that a wire feeding mechanism for improving the wire feeding stability is arranged at the top of the extruder bracket, and a heating pipe is fixedly communicated with the bottom of the wire feeding mechanism; and the bottom of the heating pipe is provided with a discharging assembly extending out of the extruder support, the right side of the extruder support is fixedly provided with a cooling fan, the cooling fan is located on the right side of the heating pipe, and the top of the wire feeding mechanism fixedly communicates with a feeding pipe. According to the FDM 3D printing extrusion mechanism with the hot runner, the hot runner technology is adopted, compared with a conventional ceramic hot end, the heating length is longer, by prolonging the length of the hot runner of the printing head and embedding an annular heating wire into a heating pipe, the flow of an extruder is higher, the retention time of a wire material in the heating pipe is longer, heating is more uniform and stable, and the production efficiency is improved. And the discharge flow can be higher, so that the stability during high-flow printing is improved.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, specifically to an FDM 3D printing extrusion mechanism with a hot runner. Background Technology

[0002] The hot runner FDM 3D printing extrusion mechanism is a key component of an FDM 3D printer. It is responsible for delivering the filament to the hot end, melting it at the hot end, and then pushing it out of the nozzle to create 3D printed parts.

[0003] For example, a Chinese patent (publication number: CN212194228U) discloses a 3D printer extruder, comprising: a motor, a motor gear, multiple double-stage reduction gears, an output reduction gear, an extrusion gear, and an output shaft. The motor gear is mounted on the motor shaft and connected to the output reduction gear via the meshing multiple double-stage reduction gears. Both the output reduction gear and the extrusion gear are mounted on the output shaft. This invention allows for the output of a larger extrusion force with a smaller motor, while also reducing the overall size and weight of the extruder. By reducing the weight of the extruder, the printing accuracy and speed of the 3D printer can be improved.

[0004] However, the heating effect of the extruder is not good enough. The heating path at the hot end of the extruder is short, and the uneven heating at high flow rates can easily lead to a decrease in printing quality, difficulty in forming, and even blockage of the extruder. Therefore, an FDM 3D printing extrusion mechanism with a hot runner is proposed to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides an FDM 3D printing extrusion mechanism with a hot runner, which has advantages such as good heating effect and solves the problem of insufficient heating effect.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an FDM 3D printing extrusion mechanism with a hot runner, comprising an extruder support, characterized in that: the top of the extruder support is provided with a filament feeding mechanism for improving filament feeding stability, the bottom of the filament feeding mechanism is fixedly connected to a heating tube, the bottom of the heating tube is provided with a discharge assembly extending outside the extruder support, a cooling fan is fixedly connected to the right side of the extruder support, the cooling fan is located to the right of the heating tube, and the top of the filament feeding mechanism is fixedly connected to a feeding pipe;

[0007] The discharge assembly includes a hot runner, the top of which is fixedly connected to a heating tube, a temperature sensor is fixedly fixed to the front side of the hot runner, and a discharge nozzle is fixedly connected to the bottom of the hot runner.

[0008] Furthermore, the extruder support includes a base, a connecting plate is fixed to the top of the base, an mounting plate is fixed to the left side of the connecting plate, and two connecting rods are fixed between the mounting plate and the base and to the right of the connecting plate.

[0009] Furthermore, the wire feeding mechanism includes a housing that is fixedly connected to the top of the mounting plate. A drive motor is fixed to the left side of the housing, and a drive rod is fixed to the output shaft of the drive motor. The drive rod is rotatably connected to the left side wall of the housing via a bearing. A drive gear is fixed to the outer surface of the drive rod, and a driven gear meshes with the front side of the drive gear. A driven rod that penetrates the left side wall of the housing and is rotatably connected to the inner right wall of the housing via a bearing is fixed to the inner side of the driven gear. The rear side of the housing is open, and a hinge shaft is fixed to the inner right wall of the housing. A stabilizing block is hinged to the outer surface of the hinge shaft. The stabilizing block extends into the housing, and a connecting bolt is threaded to the inner side of the stabilizing block. A connecting spring located outside the connecting bolt is fixed to the rear side of the stabilizing block, and the end of the connecting spring away from the stabilizing block abuts against the connecting bolt.

[0010] Furthermore, a rolling roller is fixed to the outer surface of the driven rod and inside the housing, and multiple external teeth are fixed to the front side of the stabilizing block and inside the housing.

[0011] Furthermore, the top of the outer shell is fixedly connected to the feeding pipe, and the bottom of the mounting plate is fixedly connected to the heating pipe.

[0012] Furthermore, a heating wire is embedded on the outside of the heating tube, and the cooling fan is fixed to the bottom of the mounting plate.

[0013] Furthermore, the right side of the base is concave, and the discharge assembly extends out of the base through the concave part of the base.

[0014] Furthermore, the two connecting rods are located on the front and rear sides of the discharge assembly, respectively, and multiple weight-reduction holes are provided on both the base and the mounting plate.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0016] This FDM 3D printing extrusion mechanism with hot runner adopts hot runner technology. Compared with conventional ceramic hot ends, the heating length is longer. By extending the length of the hot runner in the print head and embedding a ring heating wire in the heating tube, the extruder flow rate can reach a higher level. The filament stays in the heating tube for a longer time, resulting in more uniform and stable heating. The output flow rate can reach a higher level, thereby improving the stability of high-flow printing, improving print quality and printing speed. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a three-dimensional cross-sectional view of the hot runner of this utility model;

[0019] Figure 3 This is a three-dimensional view of the wire feeding mechanism of this utility model.

[0020] In the diagram: 1 Extruder support, 101 Base, 102 Connecting plate, 103 Mounting plate, 104 Connecting rod, 2 Wire feeding mechanism, 201 Housing, 202 Drive motor, 203 Drive gear, 204 Driven rod, 205 Driven gear, 206 Stabilizing block, 3 Heating tube, 4 Cooling fan, 5 Discharge assembly, 501 Hot runner, 502 Temperature sensor, 503 Discharge nozzle, 6 Feeding pipe. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1 to 2 This embodiment of an FDM 3D printing extrusion mechanism with a hot runner includes an extruder support 1. The top of the extruder support 1 is provided with a filament feeding mechanism 2 for improving filament feeding stability. The bottom of the filament feeding mechanism 2 is fixedly connected to a heating tube 3, which can effectively heat the filament. The bottom of the heating tube 3 is provided with a discharge assembly 5 extending outside the extruder support 1. A cooling fan 4 is fixedly connected to the right side of the extruder support 1. The cooling fan 4 and the heating tube 3 cooperate to effectively control the temperature, thereby improving the heating effect. The cooling fan 4 is located to the right of the heating tube 3. The top of the filament feeding mechanism 2 is fixedly connected to a feeding pipe 6, which is used to continuously feed the extrusion mechanism.

[0023] In addition, the extruder support 1 includes a base 101, a connecting plate 102 is fixed to the top of the base 101, an mounting plate 103 is fixed to the left side of the connecting plate 102, and two connecting rods 104 are fixed between the mounting plate 103 and the base 101 and located to the right of the connecting plate 102. The base 101 is used to provide reliable power to the extruder support 1 as a whole, and the supporting force can be smoothly transmitted to the mounting plate 103 in conjunction with the connecting plate 102 and the connecting rods 104.

[0024] In this embodiment, the feeding tube 6 continuously supplies material during use, and the wire feeding mechanism 2 stably feeds the material into the heating tube 3. After heating is completed, the heated raw material is continuously and stably discharged through the discharge component 5.

[0025] Please refer to it again. Figures 1 to 2 and Figure 3 To improve wire feeding stability, the wire feeding mechanism 2 in this embodiment includes a housing 201 fixedly connected to the top of the mounting plate 103. The housing 201 provides a stable and reliable environment for wire feeding. A drive motor 202 is fixed to the left side of the housing 201, providing stable power to the wire feeding mechanism 2. A drive rod is fixed to the output shaft of the drive motor 202. The drive rod is rotatably connected to the left side wall of the housing 201 via a bearing. A drive gear 203 is fixed to the outer surface of the drive rod. The pitch circle diameter of the driven gear 205 is much larger than that of the drive gear 203. This shape can create a deceleration effect, improve wire feeding stability, and increase torque. The driven gear 205 meshes with the front side of the drive gear 203. A through-hole is fixed to the inner side of the driven gear 205. A driven rod 204 is rotatably connected to the inner right wall of the outer casing 201 via a bearing on the left side wall. The bearing is used to improve the rotational stability of the driven rod 204. The rear side of the outer casing 201 is open and connected to the outside. A hinge shaft is fixed to the inner right wall of the outer casing 201. A stabilizing block 206 is hinged to the outer surface of the hinge shaft. The stabilizing block 206 extends into the outer casing 201. A connecting bolt is threaded to the inner side of the stabilizing block 206. A connecting spring provides support and effectively improves the stability of the connecting bolt. A connecting spring located outside the connecting bolt is fixed to the rear side of the stabilizing block 206. The end of the connecting spring away from the stabilizing block 206 abuts against the connecting bolt. By adjusting the rotation angle of the connecting bolt, the angle of the stabilizing block 206 can be adjusted, thereby improving the adaptability to the wire material.

[0026] It is understood that a rolling roller is fixed on the outer surface of the driven rod 204 and inside the housing 201. The rolling roller is used to promote the stable transmission of the filament. The external teeth can provide support force, thereby improving the stability of filament feeding. Multiple external teeth are fixed on the front side of the stabilizing block 206 and inside the housing 201. The top of the housing 201 is fixedly connected to the feeding pipe 6. The bottom of the mounting plate 103 is fixedly connected to the heating pipe 3. When the filament is fed into the heating pipe 3, the heating pipe 3 can centrally heat the filament. Heating wires are embedded on the outside of the heating pipe 3. The cooling fan 4 is fixed to the bottom of the mounting plate 103. The temperature can be adjusted by the cooperation of the heating wires and the cooling fan 4.

[0027] In addition, the discharge assembly 5 includes a hot runner 501. The top of the hot runner 501 is fixedly connected to the heating tube 3. A temperature sensor 502 is fixedly fixed on the front side of the hot runner 501. A discharge nozzle 503 is fixedly connected to the bottom of the hot runner 501. The temperature sensor 502 is used to detect the temperature of the heating wire material and, together with the heating wire and the cooling fan 4, achieves effective temperature control.

[0028] It should be further explained that the right side of the base 101 is concave, and the discharge component 5 extends to the outside of the base 101 through the concave part of the base 101. The concave part of the base 101 serves to make way, which can ensure connection stability while improving space utilization. The two connecting rods 104 are located on the front and rear sides of the discharge component 5, respectively. Multiple weight reduction holes are provided on both the base 101 and the mounting plate 103. The weight reduction holes are used to reduce the weight of the base 101 and the mounting plate 103, which can effectively reduce the overall weight.

[0029] In this embodiment, when printing with specific PLA consumables, this technical solution can reduce the printhead flow rate from 30mm. 3 / s increased to 55mm 3 / s, through the combined action of heating tube 3, wire feeding mechanism 2 and discharge assembly 5, the overall heating effect can be effectively improved.

[0030] Understandably, the feeding tube 6 provides a continuous and stable supply of material, and the filament feeding mechanism 2 ensures a continuous and stable transport of the filament. Furthermore, the heating tube 3 and the hot runner 501 work together to make the heating more uniform and stable, thereby improving the printing quality.

[0031] All electrical components mentioned in this article are electrically connected to the controller and power supply. The control method of this utility model is controlled by the controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, this utility model is mainly used to protect mechanical devices, so the control method and circuit connection will not be explained in detail.

[0032] The working principle of the above embodiments is as follows:

[0033] First, the filament enters through the feeding pipe 6. The drive motor 202 drives the drive gear 203 to rotate, which in turn drives the driven rod 204 inside the driven gear 205 to rotate, thereby driving the rolling roller inside the housing 201 to rotate. The rolling roller provides power for the movement of the filament. The external teeth on the stabilizing block 206 provide support and improve the stability of the filament movement. The filament is fed into the heating pipe 3, which heats the filament. At the same time, the cooling fan 4 controls the heating temperature. The temperature sensor 502 can detect the heating temperature in real time. After heating, the filament flows out through the hot runner 501 and is finally discharged through the discharge nozzle 503.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. An FDM 3D printing extrusion mechanism with a hot runner, comprising an extruder support (1), characterized in that: The top of the extruder support (1) is provided with a wire feeding mechanism (2) for improving wire feeding stability. The bottom of the wire feeding mechanism (2) is fixedly connected to a heating pipe (3). The bottom of the heating pipe (3) is provided with a discharge assembly (5) extending outside the extruder support (1). A cooling fan (4) is fixedly located on the right side of the extruder support (1). The cooling fan (4) is located on the right side of the heating pipe (3). The top of the wire feeding mechanism (2) is fixedly connected to a feeding pipe (6). The discharge assembly (5) includes a hot runner (501), the top of which is fixedly connected to the heating tube (3), a temperature sensor (502) is fixedly fixed to the front side of the hot runner (501), and a discharge nozzle (503) is fixedly connected to the bottom of the hot runner (501).

2. The FDM 3D printing extrusion mechanism with a hot runner according to claim 1, characterized in that: The extruder support (1) includes a base (101), a connecting plate (102) is fixed to the top of the base (101), an mounting plate (103) is fixed to the left side of the connecting plate (102), and two connecting rods (104) are fixed between the mounting plate (103) and the base (101) and to the right of the connecting plate (102).

3. The FDM 3D printing extrusion mechanism with a hot runner according to claim 2, characterized in that: The wire feeding mechanism (2) includes a housing (201) fixedly connected to the top of the mounting plate (103). A drive motor (202) is fixed to the left side of the housing (201). A drive rod is fixed to the output shaft of the drive motor (202). The drive rod is rotatably connected to the left side wall of the housing (201) via a bearing. A drive gear (203) is fixed to the outer surface of the drive rod. A driven gear (205) meshes with the front side of the drive gear (203). A through-hole gear (205) is fixed to the inner side of the driven gear (205) and engages with the left side wall of the housing (201). The inner right wall of the outer casing (201) is rotatably connected to the driven rod (204) via a bearing. The rear side of the outer casing (201) is open. A hinge shaft is fixed to the inner right wall of the outer casing (201). A stabilizing block (206) is hinged to the outer surface of the hinge shaft. The stabilizing block (206) extends into the outer casing (201). A connecting bolt is threaded to the inner side of the stabilizing block (206). A connecting spring located outside the connecting bolt is fixed to the rear side of the stabilizing block (206). The end of the connecting spring away from the stabilizing block (206) abuts against the connecting bolt.

4. The FDM 3D printing extrusion mechanism with a hot runner according to claim 3, characterized in that: A rolling roller is fixed on the outer surface of the driven rod (204) and inside the housing (201), and a plurality of external teeth are fixed on the front side of the stabilizing block (206) and inside the housing (201).

5. The FDM 3D printing extrusion mechanism with a hot runner according to claim 3, characterized in that: The top of the outer shell (201) is fixedly connected to the feeding pipe (6), and the bottom of the mounting plate (103) is fixedly connected to the heating pipe (3).

6. The FDM 3D printing extrusion mechanism with a hot runner according to claim 5, characterized in that: Heating wires are embedded on the outside of the heating tube (3), and the cooling fan (4) is fixed to the bottom of the mounting plate (103).

7. The FDM 3D printing extrusion mechanism with a hot runner according to claim 2, characterized in that: The right side of the base (101) is concave, and the discharge component (5) extends out of the base (101) through the concave part of the base (101).

8. The FDM 3D printing extrusion mechanism with a hot runner according to claim 2, characterized in that: The two connecting rods (104) are located on the front and rear sides of the discharge assembly (5), respectively, and multiple weight reduction holes are provided on the base (101) and the mounting plate (103).

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