3D printer consumable extrusion mechanism

Abstract

The application provides a 3D printer consumable extrusion mechanism, comprising a power driving assembly, a first driving roller assembly and a first driving wheel, a second driving roller assembly and a second driving wheel. The first driving wheel is in transmission connection with the power driving assembly, the second driving wheel is in transmission connection with the first driving wheel, the two driving roller assemblies are oppositely arranged and form a conveying path, and at least two roller clamping positions are arranged along the conveying direction. The power driving assembly is connected in cascade through two-stage driving wheels, so that a single power source synchronously drives the two driving roller assemblies to realize cooperative rotation. The oppositely arranged driving roller assemblies form a clamping channel to convey the consumable. Through the multiple roller clamping positions, the consumable is driven from a single point to multiple points in succession, the effective contact length is increased, the force transmission efficiency is improved, the forces of the roller clamping positions are superposed in the conveying direction, the risk of slippage caused by local load concentration is reduced, the feeding stability and conveying continuity are improved, and the printing quality is improved.

Description

[0001] This application claims domestic priority to Chinese patent application No. 202511031835.8, filed on July 25, 2025, entitled "A Structure of a 3D Printer Consumable Extruder", and Chinese patent application No. 202521566045.5, also entitled "A Structure of a 3D Printer Consumable Extruder", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of 3D printing technology, and more specifically, to a 3D printer filament extrusion mechanism. Background Technology

[0003] Currently, 3D printing equipment is developing rapidly and is gradually being applied in various fields such as industrial manufacturing, education and training, and consumer electronics. The printing process typically relies on an extrusion mechanism to feed filament into a filament, continuously feeding it into a hot end for melt extrusion or composite molding. The filament can be thermoplastic filament, continuous fiber, fiber composite filament, or other linear materials.

[0004] Existing filament extrusion mechanisms typically employ a single-set filament feeding structure, which uses a drive wheel and a clamping wheel to form a single clamping and conveying position, and utilizes the friction between the drive wheel and the consumable to drive the consumable to move along the conveying direction.

[0005] However, in related technologies, due to the existence of only a single clamping and conveying position, the effective contact length between the filament and the conveying mechanism is short, resulting in limited conveying force that can be applied to the filament. Under conditions such as high-speed printing, long-distance filament feeding, high back pressure extrusion, or fiber composite material conveying, issues such as filament slippage, discontinuous conveying, and fluctuations in extrusion volume can easily occur, thereby affecting printing accuracy and printing stability.

[0006] Therefore, how to improve the conveying stability of consumables and reduce the risk of slippage has become a technical problem that urgently needs to be solved by those skilled in the art.

[0007] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0008] To address the problems in the prior art, the present invention aims to provide a 3D printer filament extrusion mechanism to solve the technical problems of unstable feeding, discontinuous drive contact, and slippage during the filament conveying process, resulting in poor extrusion consistency, thereby improving the stability of filament conveying and extrusion accuracy.

[0009] The first aspect of this disclosure provides a 3D printer filament extrusion mechanism, comprising: a power drive assembly; a first drive wheel and a first drive roller assembly drivenly connected to the first drive wheel; a second drive wheel and a second drive roller assembly drivenly connected to the second drive wheel; the first drive wheel is drivenly connected to the power drive assembly, and the second drive wheel is drivenly connected to the first drive wheel; the first drive roller assembly and the second drive roller assembly are disposed opposite to each other; a conveying path is formed between the first drive roller assembly and the second drive roller assembly, and the first drive roller assembly and the second drive roller assembly form at least two spaced roller clamping positions along the conveying direction of the conveying path.

[0010] In some embodiments, the power drive assembly includes a motor, a first drive gear, and an intermediate gear; the first drive gear is fixedly connected to the output shaft of the motor; the first drive gear and the first drive wheel are connected by a transmission via the intermediate gear.

[0011] In some embodiments, the first drive roller assembly includes a first roller and a second roller, the first roller and the second roller being respectively disposed on both sides of the first drive wheel and both meshing with the first drive wheel; the second drive roller assembly includes a third roller and a fourth roller, the third roller and the fourth roller being respectively disposed on both sides of the second drive wheel and both meshing with the second drive wheel; wherein the first roller and the third roller are arranged opposite to each other and together form the first roller clamping position, and the second roller and the fourth roller are arranged opposite to each other and together form the second roller clamping position.

[0012] In some embodiments, the first roller, the second roller, the third roller, and the fourth roller each include a gear body and a clamping wheel arranged coaxially; each gear body maintains external tooth meshing with the corresponding first driving wheel or second driving wheel; the outer diameter of the clamping wheel is larger than the diameter of the corresponding gear body.

[0013] In some embodiments, an annular guide groove is provided on the outer peripheral surface of each clamping wheel.

[0014] In some embodiments, the 3D printer filament extrusion mechanism further includes an adjustment assembly; the adjustment assembly includes a first swing arm and a second swing arm, one end of the first swing arm and the second swing arm being coaxially hinged to a fifth pin; a third roller is mounted on the end of the first swing arm away from the fifth pin, and a fourth roller is mounted on the end of the second swing arm away from the fifth pin; the fifth pin is coaxially arranged with the rotation axis of the second drive wheel.

[0015] In some embodiments, the adjusting assembly further includes two sets of adjusting bolts, which abut against the first and second rocker arms from the outside, respectively.

[0016] In some embodiments, the 3D printer filament extrusion mechanism further includes: a cover plate; and limit rods fixed to the free ends of both the first and second swing arms, the limit rods being configured to extend into corresponding grooves in the cover plate.

[0017] In some implementations, the 3D printer filament extrusion mechanism further includes a plurality of bosses disposed on the transport path, each boss having a filament feeding through hole.

[0018] In some embodiments, quick connectors are fitted at the feed end and discharge end of the conveying path, and the quick connectors are coaxially arranged with the wire feeding through hole.

[0019] The 3D printer filament extrusion mechanism proposed in this disclosure has the following advantages: By constructing a cascaded gear transmission path between the power drive assembly and the two-stage drive wheels, power can be stably distributed from a single drive source to the first and second drive roller assemblies, thereby achieving synchronous or coordinated rotation control of each roller. By arranging the first and second drive roller assemblies opposite to each other and forming a conveying channel between them for the linear consumables to pass through, the consumables can be confined to a predetermined trajectory range during the conveying process.

[0020] Furthermore, by setting at least two spaced roller clamping positions on the conveying path, the linear consumable no longer relies solely on a single contact point for driving during the conveying process. Instead, it passes through multiple clamping areas sequentially and is clamped and driven by the corresponding rollers, thereby forming a distributed driving force input structure in space.

[0021] Because the roller clamping positions are arranged sequentially along the conveying direction, the contact process between the linear consumable and the drive structure is expanded from a single-point contact to a multi-segment continuous contact. This effectively increases the effective driving length per unit conveying path, allowing the driving force to be transmitted to the consumable step by step over a longer contact interval. Under the combined effect of this multi-point clamping and cascaded drive, the conveying force applied to the linear consumable by each roller clamping position forms a superposition effect in the same conveying direction, making the force distribution of the consumable more uniform in the axial direction and reducing the risk of slippage caused by load concentration in local contact areas.

[0022] Meanwhile, because the consumables are continuously constrained and driven by multiple positions during the conveying process, their motion state changes from intermittent force to continuous force transmission, thereby significantly reducing speed fluctuations and transient instability during the feeding process.

[0023] Furthermore, by extending the effective action path between the filament and the drive mechanism and enhancing the multi-position collaborative clamping capability, this structure enables the filament to maintain a more stable motion state during long-distance transport, thereby improving the consistency of material feeding and extrusion stability during 3D printing and reducing the risk of print quality fluctuations caused by uneven feeding.

[0024] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0025] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0026] Figure 1 This is a perspective view of the overall structure of the 3D printer filament extrusion mechanism in the embodiments of this disclosure; Figure 2 This is an exploded view of the overall structure of the 3D printer filament extrusion mechanism in the embodiments of this disclosure; Figure 3 This is a schematic diagram of the front view of the 3D printer filament extrusion mechanism in the embodiments of this disclosure; Figure 4 for Figure 3 The cross-sectional view along line AA mainly shows the meshing transmission topology of the internal gear train; Figure 5 for Figure 3 The cross-sectional view along the BB line mainly shows the contact and fit relationship between the clamping wheel and the linear consumable. Figure 6 This is a perspective view of the transmission and limiting states of each drive roller assembly after the external frame has been removed in the embodiments of this disclosure. Figure 7 This is a top view schematic diagram of the assembly relationship between the adjusting component and the cover plate in the embodiment of this disclosure; Figure 8 for Figure 7 The cross-sectional view along the DD line mainly shows the hinge and suspension structure of the double pendulum rods on the fifth pin. Figure 9 This is a perspective view from below showing the assembly relationship between the adjustment component and the cover plate in the embodiments of this disclosure.

[0027] Explanation of reference numerals in the attached figures: 1: Power drive assembly; 11: Motor; 111: Output shaft; 12: First drive gear; 13: Intermediate gear; 21: First drive wheel; 22: Second drive wheel; 31: First drive roller assembly; 32: Second drive roller assembly; 4: Wire consumable; 51: First roller; 511: Gear body; 512: Clamping wheel; 5120: Annular guide groove; 52: Second roller; 53: Third roller; 54: Fourth roller; 6: Base plate; 62: Second boss; 63: Third boss; 64: Wire feeding through hole; 65: Quick connector 7: Head; 8: Cover plate; 70: First boss; 71: First through hole; 72: Second through hole; 73: Slide groove; 8: Screw; 10: Adjusting assembly; 101: First rocker arm; 102: Second rocker arm; 103: First adjusting bolt; 104: Second adjusting bolt; 105: Abutment end; 106: Limiting rod; 93: Third pin; 94: Fourth pin; 95: Fifth pin; 96: Sixth pin; 97: Seventh pin; L: Conveying path; CC': Conveying direction; S1: First roller clamping position; S2: Second roller clamping position. Detailed Implementation

[0028] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] like Figure 1 and Figure 2 As shown, this disclosure provides a 3D printer filament extrusion mechanism, which includes a power drive assembly 1.

[0031] like Figure 2 As shown, the 3D printer filament extrusion mechanism further includes: a first drive wheel 21 and a first drive roller assembly 31 that is drivenly connected to the first drive wheel 21, and a second drive wheel 22 and a second drive roller assembly 32 that is drivenly connected to the second drive wheel 22.

[0032] The power drive component 1 is used to drive the first drive wheel 21 to rotate, and the first drive wheel 21 drives the second drive wheel 22 to rotate through the transmission structure, so as to form a cascaded power transmission relationship.

[0033] like Figure 3 and Figure 4 As shown, the first drive roller assembly 31 and the second drive roller assembly 32 are arranged opposite to each other, and a conveying path L for the linear consumable 4 to pass through is formed between them. Figure 3 (Not shown).

[0034] Structurally, such as Figure 4 As shown, the first drive roller assembly 31 and the second drive roller assembly 32 are arranged at intervals along the conveying direction CC' of the linear consumable 4, thereby forming at least two roller clamping positions arranged sequentially along the conveying direction CC' on the conveying path L, such as the first roller clamping position S1 and the second roller clamping position S2.

[0035] Each of the roller clamping positions S1 and S2 is formed by opposing rollers in the first drive roller assembly 31 and the second drive roller assembly 32, respectively. For example, the first roller 51 and the third roller 53 are located on both sides of the conveying path L and cooperate to form the first roller clamping position S1; the second roller 52 and the fourth roller 54 are located on both sides of the conveying path L and cooperate to form the second roller clamping position S2. The linear consumable 4 passes through the conveying path L between each roller clamping position and makes contact with the corresponding roller.

[0036] During the work process, combined with Figure 2 and Figure 4 As shown, the power drive assembly 1 outputs rotational power and transmits it to the corresponding drive roller assemblies 31 and 32 via the first drive wheel 21 and the second drive wheel 22, causing the rollers forming the roller clamping positions S1 and S2 to rotate. When the linear consumable 4 passes through the roller clamping positions S1 and S2, it is clamped and conveyed by the corresponding rollers, thereby moving continuously along the conveying direction CC'.

[0037] With the above structural arrangement, the linear consumable 4 can form clamping contact with the drive roller at multiple axial positions during the conveying process, thereby increasing the effective drive contact area and improving the ability to transmit driving force to the linear consumable 4.

[0038] Meanwhile, since multiple roller clamping positions S1 and S2 are arranged sequentially along the conveying direction CC', the effective contact length between the linear consumable 4 and the corresponding drive roller assemblies 31 and 32 is increased, thereby reducing the slippage phenomenon caused by excessive load in a single contact area and improving the stability of the consumable conveying process.

[0039] Furthermore, multiple roller clamping positions S1 and S2 apply conveying driving force to the linear consumable 4, so that the linear consumable 4 maintains a relatively stable axial conveying state during continuous feeding, which is beneficial to improving the material supply stability and extrusion consistency in the 3D printing process.

[0040] As an optional assembly method, such as Figure 1 and Figure 2 As shown, the 3D printer filament extrusion mechanism may also include a base plate 6 and a cover plate 7. The cover plate 7 is fixed to one side of the base plate 6 by screws 8, thereby forming an assembly space between the base plate 6 and the cover plate 7.

[0041] like Figure 2 As shown, the first drive wheel 21, the second drive wheel 22, the first drive roller assembly 31, and the second drive roller assembly 32 are all disposed within the assembly space, and are connected by the base plate 6 and the cover plate 7 (combined with...). Figure 3 (As shown) provides support and positioning.

[0042] In some implementations, such as Figures 2-4 As shown, the power drive assembly 1 includes a motor 11 ( Figure 4 (Not shown), first drive gear 12 and intermediate gear 13.

[0043] The first drive gear 12 is fixedly connected to the output shaft 111 of the motor 11 to receive the rotational power output by the motor 11.

[0044] like Figure 2 and Figure 4 As shown, the intermediate gear 13 is disposed between the first driving gear 12 and the first driving wheel 21, and meshes with both of them to transmit power, thereby forming a transmission path from the motor 11 to the first driving wheel 21.

[0045] Specifically, the first driving gear 12, the intermediate gear 13, and the first driving wheel 21 are sequentially meshed and connected. The intermediate gear 13 is set in the transmission path as a transition gear to realize the power transmission between the first driving gear 12 and the first driving wheel 21, and to meet the spatial arrangement requirements between the various transmission components.

[0046] Since the first driving gear 12, intermediate gear 13 and first driving wheel 21 all transmit power through gear meshing, the rotational motion output by the motor 11 can be transmitted to the first driving wheel 21 via the first driving gear 12 and intermediate gear 13, thereby driving the first driving wheel 21 to rotate.

[0047] In this structure, a stable mechanical transmission relationship is formed between the first drive wheel 21 and the motor 11, enabling the first drive wheel 21 to move synchronously with the start, stop, commutation and speed change of the motor 11, providing power input for the subsequent roller assemblies.

[0048] Furthermore, the second drive wheel 22 is engaged with the first drive wheel 21 to receive the power transmitted by the first drive wheel 21, thereby forming a cascaded power transmission structure from the power drive assembly 1 to the first drive wheel 21, and then from the first drive wheel 21 to the second drive wheel 22.

[0049] With the above structural arrangement, the first drive wheel 21 and the second drive wheel 22 can drive the corresponding drive roller assembly to work, thereby providing a power source for multiple roller clamping positions.

[0050] In some implementations, such as Figure 4 As shown, the first drive roller assembly 31 includes a first roller 51 and a second roller 52. The first roller 51 and the second roller 52 are respectively disposed on both sides of the first drive wheel 21 and are engaged with the first drive wheel 21 for transmission.

[0051] The second drive roller assembly 32 includes a third roller 53 and a fourth roller 54. The third roller 53 and the fourth roller 54 are respectively disposed on both sides of the second drive wheel 22 and are engaged with the second drive wheel 22 for transmission.

[0052] The first roller 51 and the third roller 53 are arranged opposite to each other and together form the first roller clamping position S1, and the second roller 52 and the fourth roller 54 are arranged opposite to each other and together form the second roller clamping position S2.

[0053] The linear consumable 4 passes through the first drive roller assembly 31 and the second drive roller assembly 32 along the conveying path, and passes through the first roller clamping position S1 and the second roller clamping position S2 in sequence.

[0054] During the power transmission process, the power drive component 1 (such as...) Figure 3 The power output (as shown) is transmitted through the first drive wheel 21 to the first roller 51 and the second roller 52, and simultaneously through the second roller 52 to the third roller 53 and the fourth roller 54, thereby causing each roller to rotate around its respective axis.

[0055] Since the first roller 51 and the third roller 53 are arranged opposite each other, and the second roller 52 and the fourth roller 54 are arranged opposite each other, the linear consumable 4 can be subjected to the clamping and conveying effects of the opposite rollers respectively when it passes through the corresponding roller clamping position.

[0056] By sequentially setting the first roller clamping position S1 and the second roller clamping position S2 along the conveying direction CC', the linear consumable 4 can obtain driving force input at multiple positions during the conveying process, thereby improving the stability of the conveying process and reducing the probability of slippage.

[0057] In some implementations, such as Figure 2 and Figure 4 As shown, the first roller 51 and the second roller 52 are respectively mounted on the third pin 93 and the fourth pin 94 via bearings. The third roller 53 and the fourth roller 54 are respectively mounted on the corresponding rocker arm structure via bearings, so that each roller can rotate independently around its own axis.

[0058] The specific gear transmission relationships are as follows: the first driving gear 12, the intermediate gear 13, and the first driving wheel 21 mesh and transmit power in sequence. The first driving wheel 21 drives the first roller 51 and the second roller 52 to rotate synchronously through gear meshing. Similarly, the second driving wheel 22 drives the third roller 53 and the fourth roller 54 to rotate synchronously through gear meshing.

[0059] Furthermore, the first drive wheel 21 and the second drive wheel 22 form a linkage transmission relationship through gear meshing, thereby establishing a definite rotational correspondence between the first drive roller assembly 31 and the second drive roller assembly 32.

[0060] In the above transmission structure, the first roller clamping position S1 and the second roller clamping position S2 are linked together by a gear meshing transmission chain, so that each roller maintains a synchronous rotation relationship in structure.

[0061] When the linear consumable 4 passes through the first roller clamping position S1 and the second roller clamping position S2 in sequence, it is clamped and driven by the corresponding rollers at different axial positions of the conveying path L, so that the driving force is distributed in multiple points along the conveying direction CC' during the conveying process.

[0062] Compared to a drive structure with a single clamping position, this multi-point clamping arrangement can extend the effective contact range between the consumable 4 and the drive structure, and reduce local slippage or feed fluctuations caused by concentrated load in a single contact area, thereby improving the stability of the conveying process.

[0063] In some implementations, such as Figures 4-6 As shown, the first roller 51, the second roller 52, the third roller 53 and the fourth roller 54 have the same structure.

[0064] Taking the first roller 51 as an example, it includes a gear body 511 and a clamping wheel 512 arranged coaxially. The gear body 511 and the clamping wheel 512 are arranged sequentially along the axial direction to form an integral or split composite structure, so as to form a roller unit with both transmission and clamping functions.

[0065] The gear body 511 is disposed on the side close to the corresponding driving wheel and forms an external gear meshing relationship with the first driving wheel 21 or the second driving wheel 22. It is used to receive the rotational power output by the corresponding driving wheel and transmit the rotational motion to the coaxial clamping wheel 512.

[0066] The clamping wheel 512 is disposed on the outer side of the gear body 511 along the axial direction and is coaxially fixedly connected to the gear body 511, so that it can rotate synchronously with the gear body 511, thereby providing flexible contact and clamping effect on the linear consumable 4 during rotation.

[0067] Among them, such as Figure 4 As shown, the clamping wheels 512 of the first roller 51 and the third roller 53 together form the first roller clamping position S1; the clamping wheels 512 of the second roller 52 and the fourth roller 54 together form the second roller clamping position S2.

[0068] In some embodiments, the clamping wheel 512 is made of an elastic material, such as polyurethane or other polymeric materials with elastic deformation recovery capabilities, to provide a certain deformation buffer for the linear consumable 4 during clamping and reduce the damage to the surface of the consumable by rigid compression.

[0069] In some implementations, such as Figure 6 As shown, the outer diameter of the clamping wheel 512 is larger than the tooth tip circle diameter of the gear body 511, so that when the relatively arranged rollers clamp the linear consumable 4, the contact interface is mainly formed by the corresponding clamping wheels 512 on both sides, while the gear bodies 511 maintain a distance in the working state and do not participate in direct contact, thereby avoiding rigid interference or wear of the tooth structure on the consumable 4, and ensuring the continuity and stability of the clamping and conveying process.

[0070] In some implementations, such as Figure 6 As shown, each of the clamping wheels 512 has an annular guide groove 5120 on its outer peripheral surface.

[0071] The annular guide groove 5120 extends continuously along the circumferential direction of the clamping wheel 512 and is coaxially distributed with the clamping wheel 512, serving to form a support for the linear consumable 4 (e.g., ...) during the rotation of the clamping wheel 512. Figure 5 The circumferential limiting structure shown in the figure.

[0072] During operation, after the linear consumable 4 enters the clamping area of ​​the clamping wheel 512, it is partially embedded in the annular guide groove 5120. Through the contact and cooperation between the groove wall and the outer periphery of the linear consumable 4, the linear consumable 4 is provided with lateral position constraint and guidance, thereby limiting its radial displacement during the conveying process.

[0073] This structural design ensures that the linear consumable 4 remains within the predetermined conveying trajectory range when passing through the clamping area, reducing feeding instability caused by axial sway or lateral slippage and improving the stability and consistency of the overall conveying path.

[0074] In some implementations, such as Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the 3D printer filament extrusion mechanism also includes an adjustment component 10.

[0075] like Figure 2 , Figure 7 and Figure 8 As shown, the adjustment assembly 10 includes a first swing rod 101, a second swing rod 102, a fifth pin 95, a sixth pin 96, and a seventh pin 97. One end of the first swing rod 101 and the second swing rod 102 are coaxially hinged to the fifth pin 95 to form a double swing support structure with the fifth pin 95 as the common rotation fulcrum.

[0076] The third roller 53 is mounted on the end of the first rocker arm 101 away from the fifth pin 95, and the fourth roller 54 is mounted on the end of the second rocker arm 102 away from the fifth pin 95, so that the third roller 53 and the fourth roller 54 form a cantilever support structure through the corresponding rocker arm, and can swing synchronously or independently with the first rocker arm 101 and the second rocker arm 102 around the fifth pin 95.

[0077] Specifically, one end of the fifth pin 95 is fixedly mounted on the base plate 6, and the other end extends outward after passing through the cover plate 7. One end of the first swing rod 101 and the second swing rod 102 are both hinged to the exposed end of the fifth pin 95, thereby forming a double swing adjustment structure with the base plate 6 and the cover plate 7 as the support base, which is used to realize the adjustable installation and pre-tightening adjustment of the positions of the third roller 53 and the fourth roller 54.

[0078] In some implementations, such as Figure 2 As shown, the cover plate 7 has a first through hole 71 and a second through hole 72.

[0079] Combination Figure 2 , Figure 7 and Figure 8One end of the sixth pin 96 is fixedly connected to the end of the first rocker arm 101 away from the fifth pin 95, and the other end passes through the first through hole 71 and is connected to the third roller 53 through a bearing.

[0080] One end of the seventh pin 97 is fixedly connected to the end of the second rocker arm 102 away from the fifth pin 95, and the other end passes through the second through hole 72 and is connected to the fourth roller 54 through a bearing.

[0081] like Figure 2 As shown, the third roller 53 and the fourth roller 54 respectively form a meshing transmission relationship with the two sides of the second driving wheel 22.

[0082] Thus, the third roller 53 and the fourth roller 54 form a suspended mounting structure through the first rocker arm 101 and the second rocker arm 102, respectively, and achieve transmission cooperation with both sides of the second drive wheel 22.

[0083] In some embodiments, the fifth pin 95 is coaxially arranged with the rotation axis of the second drive wheel 22, so that the first rocker arm 101 and the second rocker arm 102 rotate around the same axis during adjustment, thereby maintaining a stable reference state in their relative geometric relationship with the second drive wheel 22.

[0084] This coaxial arrangement ensures that during the swing adjustment process, the meshing center distance between the second drive wheel 22, the third roller 53, and the fourth roller 54 remains basically constant, thereby maintaining a stable gear meshing state during the clamping force adjustment process, avoiding meshing interference, tooth disengagement, or transmission discontinuity problems, and ensuring the continuity of power transmission and output stability.

[0085] In some embodiments, since the first roller 51 and the second roller 52 are fixedly disposed between the base plate 6 and the cover plate 7 to form a relatively fixed reference mounting structure, while the third roller 53 and the fourth roller 54 are rotatably disposed around the fifth pin 95 through the rocker arm structure, their spatial positions can change with the swing of the rocker arm.

[0086] Specifically, by adjusting the swing angle of the first rocker arm 101 and the second rocker arm 102 relative to the fifth pin 95, the relative positional relationship of the third roller 53 and the fourth roller 54 relative to the first roller 51 and the second roller 52 can be changed.

[0087] Therefore, the distance between the fixed clamping reference defined by the first roller 51 and the second roller 52 and the movable clamping structure formed by the third roller 53 and the fourth roller 54 can be adjusted, thereby realizing the adjustment of the clamping distance of the linear consumable 4 located therebetween.

[0088] In some implementations, such as Figures 1-3 , Figure 7 and Figure 9 As shown, the adjustment assembly 10 also includes two sets of adjustment bolts 103 and 104, which are arranged radially toward the first swing rod 101 and the second swing rod 102, respectively, for limiting and adjusting the swing position of the corresponding swing rods.

[0089] The cover plate 7 has a first boss 70 on both sides, and each of the first bosses 70 has a threaded hole. The first adjusting bolt 103 and the second adjusting bolt 104 are screwed into the corresponding threaded holes.

[0090] The end of the first adjusting bolt 103 abuts against the outer side of the corresponding first rocker arm 101, and the end of the second adjusting bolt 104 abuts against the outer side of the corresponding second rocker arm 102. By changing the screwing depth, the swing angle of the corresponding rocker arm is limited, thereby adjusting the spatial positional relationship between the third roller 53 and the fourth roller 54 relative to the first drive roller assembly 31.

[0091] In some implementations, such as Figure 1 , Figure 2 and Figure 7 As shown, the abutting end 105 of the first adjusting bolt 103 and the second adjusting bolt 104 is a hemispherical structure, so that the first adjusting bolt 103 and the second adjusting bolt 104 respectively form point contact or near point contact with the corresponding first swing rod 101 and the second swing rod 102, so as to adapt to the change of contact position of the swing rod under different swing angles and reduce the local contact stress concentration.

[0092] In some implementations, such as Figure 1 , Figure 2 , Figure 7 and Figure 9 As shown, the free ends of the first swing rod 101 and the second swing rod 102 are both fixedly provided with limiting rods 106.

[0093] The cover plate 7 has a corresponding sliding groove 73. The limiting rod 106 passes through the corresponding sliding groove 73 and is slidably or clearanceably fitted with the sliding groove 73. It can slide relative to the extension direction of the sliding groove 73, which is perpendicular to the conveying direction CC'.

[0094] With the above structural configuration, when the first swing rod 101 and the second swing rod 102 swing around the fifth pin 95 for adjustment, their free ends are simultaneously supported and guided by the slide groove 73, thereby preventing the corresponding swing rod from bending in a cantilever or shifting laterally under stress.

[0095] Furthermore, the slide groove 73 can limit the maximum swing stroke of the first swing rod 101 and the second swing rod 102, thereby preventing the corresponding swing rods from swinging excessively, ensuring that the third roller 53 and the fourth roller 54 are always within the preset adjustment range, and helping to improve the structural stability and working reliability of the adjustment component 10.

[0096] In some embodiments, the limiting rod 106 forms a guiding fit with the side wall of the corresponding slide groove 73, thereby providing lateral support for the first swing rod 101 and the second swing rod 102, so as to reduce the lateral sway generated when the free end of the swing rod is subjected to force and improve the stability of the roller clamping position.

[0097] Furthermore, through the cooperation structure between the slide groove 73 and the cylindrical guide, the first rocker arm 101 and the second rocker arm 102 can transfer part of the radial load to the cover plate 7 when they are subjected to the force of the two sets of adjusting bolts 103 and 104, thereby reducing the force concentration at the hinge end of the rocker arm and improving the rigidity and durability of the overall structure.

[0098] In some implementations, such as Figure 4 As shown, the 3D printer filament extrusion mechanism also includes multiple bosses disposed on the conveying path L. For example, a second boss 62 is disposed at the feed end and the discharge end of the base plate 6, and a third boss 63 is disposed between the two second bosses 62.

[0099] The second boss 62 and the third boss 63 are both fixedly mounted on the base plate 6 and arranged sequentially along the extension direction of the conveying path L. Both the second boss 62 and the third boss 63 are provided with wire feeding through holes 64, which are arranged through the conveying path L, and preferably, multiple wire feeding through holes 64 are arranged coaxially.

[0100] During the conveying process of the linear consumable 4, the linear consumable 4 passes through each wire feeding through hole 64 in sequence and enters the roller clamping area, so that the linear consumable 4 is guided and constrained before entering the clamping and conveying area and after leaving the clamping and conveying area.

[0101] Through the segmented guide structure of the multiple bosses 62 and 63, continuous axial support and guidance can be provided for the linear consumable 4, limiting the lateral displacement and bending deformation of the linear consumable 4 during the conveying process, and helping to maintain the relative position stability between the linear consumable 4 and the clamping positions S1 and S2 of each roller, thereby improving the smoothness and reliability of the consumable conveying process.

[0102] In some implementations, such as Figure 1 , Figure 2 and Figure 4 As shown, quick connectors 65 are respectively installed at the inlet and outlet ends of the conveying path L.

[0103] The quick connectors 65 are respectively mounted on the second protrusions 62 at both ends. The quick connectors 65 are used to connect to the external guide tube and guide and position the linear consumable 4 entering the conveying path L, so as to realize the rapid introduction and export of the linear consumable 4.

[0104] In some embodiments, the third boss 63 is located between the two second bosses 62 and is disposed in the middle region of the conveying path L.

[0105] The wire feeding through holes 64 in the second boss 62 and the third boss 63 are coaxially arranged so that the linear consumable 4 is always conveyed along the same axial direction during the process from the feed end to the output end.

[0106] Those skilled in the art will understand that the intermediate guide structure formed by the third protrusion 63 provides additional support and axial guidance constraint for the middle section of the linear consumable 4 between the two roller clamping positions S1 and S2, thereby limiting the lateral displacement and bending deformation of the linear consumable 4 during the conveying process, allowing it to enter the subsequent roller clamping position in a more stable posture. This further improves the coordinated conveying stability between multiple roller clamping positions and reduces the risk of slippage, jamming, and wire breakage caused by consumable skewing, oscillation, or uneven local force.

[0107] Other embodiments of this disclosure will readily occur to those skilled in the art upon reading this specification and in conjunction with the embodiments of the invention. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A 3D printer filament extrusion mechanism, characterized in that, include: Power drive components (1); The first drive wheel (21) and the first drive roller assembly (31) which is connected to the first drive wheel (21) in a transmission. The second drive wheel (22) and the second drive roller assembly (32) which is connected to the second drive wheel (22) in a transmission. The first drive wheel (21) is connected to the power drive assembly (1) in a transmission connection, and the second drive wheel (22) is connected to the first drive wheel (21) in a transmission connection. The first drive roller assembly (31) and the second drive roller assembly (32) are disposed opposite to each other; A conveying path (L) is formed between the first drive roller assembly (31) and the second drive roller assembly (32), and the first drive roller assembly (31) and the second drive roller assembly (32) form at least two spaced roller clamping positions (S1, S2) along the conveying direction (CC') of the conveying path (L).

2. The 3D printer filament extrusion mechanism according to claim 1, characterized in that, The power drive assembly (1) includes a motor (11), a first drive gear (12), and an intermediate gear (13). The first drive gear (12) is fixedly connected to the output shaft (111) of the motor (11); The first drive gear (12) and the first drive wheel (21) are connected by an intermediate gear (13).

3. The 3D printer filament extrusion mechanism according to claim 1, characterized in that, The first drive roller assembly (31) includes a first roller (51) and a second roller (52). The first roller (51) and the second roller (52) are respectively disposed on both sides of the first drive wheel (21) and are both engaged with the first drive wheel (21). The second drive roller assembly (32) includes a third roller (53) and a fourth roller (54), the third roller (53) and the fourth roller (54) are respectively disposed on both sides of the second drive wheel (22), and both are engaged with the second drive wheel (22); The first roller (51) and the third roller (53) are arranged opposite to each other and together form the first roller clamping position (S1), and the second roller (52) and the fourth roller (54) are arranged opposite to each other and together form the second roller clamping position (S2).

4. The 3D printer filament extrusion mechanism according to claim 3, characterized in that, The first roller (51), the second roller (52), the third roller (53) and the fourth roller (54) each include a gear body (511) and a clamping wheel (512) arranged coaxially. Each gear body (511) maintains external tooth meshing with the corresponding first driving gear (21) or second driving gear (22); The outer diameter of the clamping wheel (512) is larger than the diameter of the corresponding gear body (511).

5. The 3D printer filament extrusion mechanism according to claim 4, characterized in that, Each of the clamping wheels (512) has an annular guide groove (5120) on its outer peripheral surface.

6. The 3D printer filament extrusion mechanism according to claim 3, characterized in that, It also includes an adjustment component (10); The adjustment assembly (10) includes a first rocker arm (101) and a second rocker arm (102), with one end of the first rocker arm (101) and the second rocker arm (102) being coaxially hinged to a fifth pin (95). The third roller (53) is mounted on the end of the first rocker arm (101) away from the fifth pin (95), and the fourth roller (54) is mounted on the end of the second rocker arm (102) away from the fifth pin (95); The fifth pin (95) is coaxially arranged with the rotation axis of the second drive wheel (22).

7. The 3D printer filament extrusion mechanism according to claim 6, characterized in that, The adjustment assembly (10) also includes two sets of adjustment bolts (103, 104), which abut against the first rocker arm (101) and the second rocker arm (102) from the outside.

8. The 3D printer filament extrusion mechanism according to claim 6, characterized in that, Also includes: Cover plate (7); The free ends of the first swing rod (101) and the second swing rod (102) are both fixed with limit rods (106), which are configured to extend into the grooves (73) opened in the cover plate (7).

9. The 3D printer filament extrusion mechanism according to claim 1, characterized in that, The 3D printer filament extrusion mechanism also includes: Multiple bosses (62, 63) are provided on the conveying path (L), and each boss (62, 63) is provided with a wire feeding through hole (64).

10. The 3D printer filament extrusion mechanism according to claim 9, characterized in that, Quick connectors (65) are installed at the feed end and discharge end of the conveying path (L), and the quick connectors (65) are coaxially arranged with the wire feeding through hole (64).

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