Extrusion mechanism of FDM printer

Abstract

The utility model discloses an FDM printer extrusion mechanism which structurally comprises a mounting base plate and an extruder main body fixedly mounted on the mounting base plate, the extruder main body comprises a first shell and a second shell, a mounting interval is formed in the first shell, a driving gear piece is arranged in the mounting interval, a stirring support is rotationally connected in the first shell, and a driving gear piece is arranged in the driving gear piece. A driven gear piece is rotationally arranged in the shifting support, two extending parts are correspondingly arranged at the positions, located in the mounting interval, of the first shell up and down, and the two extending parts are of a V-shaped structure matched with a gap between the driving gear piece and the driven gear piece; according to the utility model, through the arrangement of the extension part, the distance between the printing consumables and the second channel from the extrusion position of the two gear pieces is greatly reduced, so that the extruded linear consumables smoothly enter the second channel, and the condition of material blockage or wire drawing is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printers, and more specifically, it relates to an extrusion mechanism for an FDM printer. Background Art

[0002] Fused Deposition Modeling (FDM) is one of the main 3D printing technologies. In this technology, a hot-melt filament is heated and melted, then extruded from a nozzle, and deposited on a printing work platform or the previously cured material of the previous layer. When the temperature is lower than the curing temperature of the filament, it starts to cure and form, and finally prints into a solid.

[0003] Currently, the structure of a traditional proximal extruder is that the upper end is the extruder and the lower end is the extrusion head. The distance between the consumable at the extrusion gear and the melting end is still relatively long. The flexible consumable is subjected to the downward force of the extrusion gear and has enough distance to cause huge deformation of the consumable between the two gears, resulting in low extrusion accuracy. At the same time, there will also be a phenomenon of wire drawing, and even material blockage may occur, leading to printing failure. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide an extrusion mechanism for an FDM printer to solve the above technical problems.

[0005] To achieve the above purpose, the utility model provides the following technical solution: An extrusion mechanism for an FDM printer includes a mounting substrate and an extruder main body fixedly installed on the mounting substrate. The extruder main body includes a first housing and a second housing. The first housing is formed with a mounting section, and a driving gear member is disposed inside the mounting section. A power source is installed on one side of the first housing, and the power source is drivingly connected to the driving gear member. A toggle bracket is rotatably connected inside the first housing, and a driven gear member is rotatably disposed inside the toggle bracket. Two extending portions are correspondingly arranged up and down at the mounting section of the first housing. The two extending portions are in a V-shaped structure adapted to the gap between the driving gear member and the driven gear member. A first channel communicating with the top surface of the first housing is opened at the center of one of the extending portions, and a second channel communicating with the printing nozzle is opened at the center of the other extending portion.

[0006] The utility model is further provided as: The toggle bracket includes a toggling portion. Two fixing ears are formed on one side of the toggling portion. A pivot shaft is rotatably penetrated inside the first housing, and the two fixing ears are respectively fixedly connected to both ends of the pivot shaft. The driven gear member is rotatably disposed between the two fixing ears.

[0007] The utility model is further provided as: The toggling portion is formed with an assembly groove for installing a spring member. The other end of the spring member is connected to the first housing. The spring member urges the toggle bracket to drive the driven gear member to approach the driving gear member to cooperate to complete material extrusion.

[0008] The utility model is further configured as follows: the printing nozzle comprises an extrusion tube connected and conducted with the second channel, and a heating shell is installed on the outer ring of the extrusion tube.

[0009] The utility model is further configured as follows: two heating rods are arranged inside the heating shell at the extrusion tube correspondingly.

[0010] The utility model is further configured as follows: a plurality of heat sinks are formed on the first shell at positions corresponding to the first channel.

[0011] The utility model is further configured as follows: an air supply port is formed at a position of the second shell corresponding to the heat sink, an air collecting chamber is installed at the air supply port, and an air inlet interface is provided at the top of the air collecting chamber.

[0012] In summary, the utility model has the following beneficial effects: the linear consumables of the utility model are supplied from the first channel into the extrusion gap formed between the driving gear part and the driven gear part, the driving gear part rotating in the clockwise direction and the driven gear part rotating in the counterclockwise direction exert a downward extrusion force on the linear consumables, and the consumables are fed into the second channel, the two extension parts are V-shaped structures adapted to the gap between the driving gear part and the driven gear part, and the setting of the extension parts greatly reduces the distance between the extrusion position of the two gear parts and the second channel of the printing consumables, so that the extruded linear consumables can smoothly enter the second channel, avoiding blockage or wire drawing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the structural disassembly of the utility model;

[0016] Figure 3 This is a structural schematic diagram of the toggle bracket and the driven gear member of the utility model;

[0017] Figure 4 It is a schematic diagram of the three-dimensional structure of the first shell of the utility model.

[0018] Figure numerals: 1. mounting substrate; 2. first shell; 20. second shell; 21. mounting section; 22. driving gear member; 23. power source; 24. extension portion; 25. first channel; 26. second channel; 3. toggle bracket; 30. driven gear member; 31. toggle portion; 32. fixing ear; 33. pivot; 34. assembly groove; 35. mounting groove; 4. print nozzle; 40. extrusion tube; 41. heating shell; 42. heating rod; 43. heat sink; 44. air outlet; 45. air collecting chamber; 46. air inlet interface; 5. air chamber; 51. heat dissipation groove. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figures 1-4 As shown, an FDM printer extrusion mechanism of an embodiment of the utility model includes a mounting substrate 1 and an extruder body fixed on the mounting substrate 1, the extruder body includes a first shell 2 and a second shell 20, the first shell 2 is formed with a mounting interval 21 and the mounting interval 21 has a driving gear member 22 built therein, a power source 23 is installed on one side of the first shell 2 and the power source 23 is drivingly connected to the driving gear member 22, a toggle bracket 3 is rotatably connected in the first shell 2, a driven gear member 30 is rotatably arranged in the toggle bracket 3, the first shell 2 is located at the mounting interval 21 and two extensions 24 are correspondingly arranged above and below, the two extensions 24 are in a V-shaped structure adapted to the gap between the driving gear member 22 and the driven gear member 30, a first channel 25 connected to the top surface of the first shell 2 is opened at the center of one of the extensions 24, and a second channel 26 connected to the print head 4 is opened at the center of the other extension 24.

[0021] When in use, the power source 23 is started to drive the driving gear member 22 to rotate, and the driving gear member 22 meshes with the driven gear member 30 and rotates synchronously, that is, the driving gear member 22 and the driven gear member 30 rotate in opposite directions, wherein the outer circumferences of the driving gear member 22 and the driven gear member 30 are both formed with meshing portions and arc-shaped guide grooves, and an extrusion gap for the printing consumables to pass through is formed between the two arc-shaped guide grooves, and the linear consumables are supplied into the above-mentioned extrusion gap from the first channel 25, and the driving gear member 22 rotating in the clockwise direction and the driven gear member 30 rotating in the counterclockwise direction exert downward extrusion force on the linear consumables, and the consumables are fed into the second channel 26;

[0022] Among them, the two extension parts 24 are V-shaped structures adapted to the gap between the driving gear part 22 and the driven gear part 30. The setting of the extension part 24 greatly reduces the distance between the printing consumables from the extrusion position of the two gear parts to the second channel 26, so that the extruded linear consumables can smoothly enter the second channel 26.

[0023] The toggle bracket 3 includes a toggle portion 31, and two fixed ears 32 are formed on one side of the toggle portion 31. A pivot 33 is rotatably penetrated in the first shell 2, and the two fixed ears 32 are respectively fixedly connected to the two ends of the pivot 33, and the driven gear member 30 is rotatably arranged between the two fixed ears 32; the toggle portion 31 is formed with an assembly groove 34 for installing a spring member, and the other end of the spring member is connected to the first shell 2. The spring member prompts the toggle bracket 3 to drive the driven gear member 30 to approach the driving gear member 22 to cooperate in completing the extrusion.

[0024] When in use, the toggle bracket 3 is rotatably connected to the first housing 2 via the pivot 33, and the toggle portion 31 provides a stable fulcrum for the rotation of the toggle bracket 3. The spring member is an existing conventional part not shown in the figure. One end of the spring member passes through the assembly groove 34 and is fixedly connected to the toggle portion 31, and the other end is connected to the preset installation groove 35 of the first housing 2. In the initial state, the spring member prompts the toggle bracket 3 to drive the driven gear member 30 to approach the driving gear member 22 to cooperate with the compression of the consumables. The consumables are clamped between the driving gear member 22 and the driven gear member 30, and are extruded downward as they roll;

[0025] Furthermore, when the toggle bracket 3 is toggled, it is driven to rotate along the pivot 33. The toggle bracket 3 overcomes the elastic force of the spring member and rotates around the pivot 33 to separate the driven gear member 30 from the driving gear member 22. At this time, the staff operates the consumables to pass through the driving gear member 22 and the driven gear member 30 to realize the consumable threading before printing. After the wire threading is completed, the toggle bracket 3 is released. At this time, the spring member accumulates energy and contracts, and the toggle bracket 3 is reset under the action of the elastic force, so that the driving gear member 22 and the driven gear member 30 are re-matched together, the consumables are clamped, and extrusion feeding begins.

[0026] The print head 4 includes an extrusion tube 40 connected to and in communication with the second channel 26 . A heating shell 41 is installed on the outer ring of the extrusion tube 40 . Two heating rods 42 are correspondingly arranged at the extrusion tube 40 in the heating shell 41 .

[0027] When in use, the heating rod 42 is electrically connected to an external matching electrical component to generate heat. The heat is quickly transferred to the cooled linear consumable in the extrusion tube 40 through the dual heating rods 42. When the consumable is melted by the heat, the linear consumable can smoothly enter the nozzle under the engagement of the dual gears, thereby accelerating the melting and flow of the material, avoiding blockage in the second channel 26 or the extrusion tube 40, and preventing the linear consumable from bending outward and overflowing during the rotation of the gears.

[0028] A number of heat dissipation fins 43 are formed at the corresponding position of the first housing 2 corresponding to the first channel 25.

[0029] During use, by setting the heat dissipation fins 43 to dissipate heat from the housing, it is avoided that the heat generated by the heating rod 42 in the printing head 4 is conducted to the first housing 2, resulting in premature melting of the consumable material in the first housing 2, and avoiding the situation of blockage or overflow of the material inlet at the second channel 26.

[0030] An air supply port 44 is formed at the corresponding position of the second housing 20 corresponding to the heat dissipation fins 43. An air collecting chamber 45 is installed at the air supply port 44, and an air inlet interface 46 is provided at the top of the air collecting chamber.

[0031] During use, the air inlet interface 46 of the air collecting chamber 45 is connected and communicated with an external air supply unit. The external air supply unit sends gas into the air collecting chamber 45. An air supply outlet (not shown in the figure) is formed at the lower part of the air collecting chamber 45 corresponding to the air supply port 44. The gas is transported to each heat dissipation fin 43 through the air collecting chamber 45 and the air supply port 44. The gas passes through the gaps between the heat dissipation fins 43 to take away the heat of the heat dissipation fins 43, improving the heat dissipation effect;

[0032] Furthermore, the power source 23 is preferably a servo motor. A heat dissipation through groove 51 is opened on the outer shell of the servo motor. The gas in the air collecting chamber 45 blows towards the lower part of the outer shell of the servo motor after passing through the heat dissipation fins 43, taking away the heat in the servo motor at the same time. Through the above design, the heat dissipation fins 43 and the power source 23 can be cooled simultaneously;

[0033] Furthermore, an air chamber 5 is also installed on one side of the printing head 4 of the extrusion mechanism. The outlet of the air chamber 5 is aligned with the extrusion end of the nozzle, so that the extruded consumable material can be quickly cooled and shaped, ensuring the printing quality and printing accuracy.

[0034] The electrical components appearing in this article are all electrically connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device such as a computer that plays a control role.

[0035] It should be noted at the same time that the terms pointed out by the present invention, such as: "front", "rear", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection scope of the present invention.

[0036] The above are only the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements should also be regarded as within the protection scope of the present utility model.

Claims

1. An extrusion mechanism for an FDM printer, comprising a mounting substrate (1) and an extruder main body fixedly installed on the mounting substrate (1), characterized in that: The extruder body comprises a first shell (2) and a second shell (20); the first shell (2) is formed with a mounting area (21) and the mounting area (21) has a driving gear (22) built therein; a power source (23) is installed on one side of the first shell (2) and the power source (23) is drivingly connected to the driving gear (22); a toggle bracket (3) is rotatably connected inside the first shell (2); a driven gear (30) is rotatably arranged inside the toggle bracket (3); two extensions (24) are correspondingly arranged above and below the mounting area (21) of the first shell (2); the two extensions (24) are in a V-shaped structure adapted to the gap between the driving gear (22) and the driven gear (30); a first channel (25) communicating with the top surface of the first shell (2) is opened at the center of one of the extensions (24); and a second channel (26) communicating with the print head (4) is opened at the center of the other of the extensions (24).

2. The FDM printer extrusion mechanism according to claim 1, characterized in that: The toggle bracket (3) comprises a toggle portion (31), one side of the toggle portion (31) is formed with two fixing ears (32), a pivot (33) is rotatably provided in the first shell (2), the two fixing ears (32) are respectively fixedly connected to two ends of the pivot (33), and the driven gear member (30) is rotatably arranged between the two fixing ears (32).

3. The FDM printer extrusion mechanism according to claim 2, characterized in that: The toggle portion (31) is formed with an assembly groove (34) for mounting a spring member, the other end of the spring member is connected to the first housing (2), and the spring member prompts the toggle bracket (3) to drive the driven gear member (30) to move closer to the driving gear member (22) to cooperate and complete the extrusion.

4. The FDM printer extrusion mechanism according to claim 1, characterized in that: The printing nozzle (4) comprises an extrusion tube (40) connected to and in conduction with the second channel (26), and a heating shell (41) is mounted on the outer ring of the extrusion tube (40).

5. The FDM printer extrusion mechanism according to claim 4, characterized in that: Two heating rods (42) are arranged inside the heating shell (41) at the locations corresponding to the extrusion tube (40).

6. The FDM printer extrusion mechanism according to claim 5, characterized in that: The first shell (2) is formed with a plurality of heat sinks (43) at locations corresponding to the first channel (25).

7. The FDM printer extrusion mechanism according to claim 6, characterized in that: The second shell (20) is formed with an air supply port (44) at a position corresponding to the heat sink (43); the air supply port (44) is provided with an air collecting chamber (45); and the top of the air collecting chamber has an air inlet interface (46).

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