Conveying assembly, extrusion mechanism and 3D printer

Abstract

The utility model relates to a conveying assembly, an extrusion mechanism and a 3D printer. The conveying assembly comprises a first extrusion wheel and a second extrusion wheel, wherein a first arc-shaped groove is formed in the outer wall of the first extrusion wheel; the second extrusion wheel is in meshed connection with the first extrusion wheel, a second arc-shaped groove is formed in the outer wall of the second extrusion wheel, and a conveying channel for containing solid wires is defined by the first arc-shaped groove and the second arc-shaped groove; wherein the groove wall of the first arc-shaped groove is provided with a plurality of first tooth grooves which are concavely arranged, the first tooth grooves are arranged at intervals in the circumferential direction of the first extrusion wheel, a first tooth part is formed between every two adjacent first tooth grooves in the circumferential direction, and the first tooth parts can abut against the solid wires. Thus, the first tooth part can be engaged with the solid wire rod, the contact area of the solid wire rod and the first tooth part is increased, the solid wire rod is prevented from slipping, meanwhile, continuous conveying of the solid wire rod can be achieved, it is guaranteed that extrusion force borne by the solid wire rod is uniform, and the situation that the surface of the solid wire rod is damaged and slips is avoided.

Description

Technical Field

[0001] This application relates to the field of 3D printing technology, and in particular to a conveying component, an extrusion mechanism, and a 3D printer. Background Technology

[0002] FDM (Fused Deposition Modeling) 3D printers typically use solid filament as printing material. The printer employs fused deposition modeling technology to melt the nozzle and extrude the molten filament. The extrusion mechanism delivers the solid filament, pushing it into the melting mechanism and providing pressure for extrusion during the printing process.

[0003] Currently, the extrusion mechanism pushes the filament through contact between the extrusion wheel and the filament. However, the contact area between the extrusion wheel and the filament is small, and the contact between them is discontinuous. This results in uneven extrusion force on the filament, causing damage and slippage on the filament surface, leading to poor stability in the operation of the 3D printer. Utility Model Content

[0004] Therefore, it is necessary to address the problems of filament damage and slippage caused by the small contact area and discontinuous contact between the extrusion wheel and the filament, and to provide a conveying component, extrusion mechanism and 3D printer that can increase the contact area with the solid filament and enable continuous conveying of the solid filament, avoid damage and slippage on the surface of the solid filament, and ensure the stability of the 3D printer operation.

[0005] A conveying assembly, comprising:

[0006] A first extrusion wheel, the outer wall of which has a first arcuate groove; and

[0007] The second extrusion wheel is meshed with the first extrusion wheel. The outer wall of the second extrusion wheel has a second arc-shaped groove. The first arc-shaped groove and the second arc-shaped groove are arranged to form a conveying channel for accommodating solid wire.

[0008] The first arc-shaped groove has a plurality of recessed first toothed grooves on its groove wall. The plurality of first toothed grooves are spaced apart along the circumference of the first extrusion wheel. A first tooth is formed between two circumferentially adjacent first toothed grooves. The first tooth is capable of pressing against the solid wire.

[0009] In one embodiment of this application, each of the first tooth grooves includes a first recess and a second recess, the first recess and the second recess being inclined along the radial direction of the first extrusion wheel and inclined relative to the rotation axis of the first extrusion wheel and facing opposite directions.

[0010] The first recess and the second recess are communicated, or the first recess and the second recess are at least partially staggered.

[0011] In an embodiment of the present application, the first tooth groove comprises at least one of the following features:

[0012] Firstly, the first recess and the second recess are one of a straight recess, a curved recess, a straightly spliced recess, a curvedly spliced recess, and a straightly and curvedly spliced recess.

[0013] Secondly, the first recess and the second recess are identical or different in shape.

[0014] Thirdly, the inner wall of the first arc-shaped groove further comprises an annular chip pocket recessed between the first recess and the second recess and communicated with the first recess and the second recess, and the groove depth of the chip pocket is greater than the groove depth of the first recess and the second recess.

[0015] In an embodiment of the present application, the first tooth groove comprises at least one of the following features:

[0016] Firstly, the distance between two circumferentially adjacent first tooth grooves is 0.1mm-0.2mm.

[0017] Secondly, the groove width of each first tooth groove along the circumference of the first extrusion wheel is 0.4mm-0.5mm.

[0018] Thirdly, the groove depth of each first tooth groove recessed in the groove wall of the first arc-shaped groove is 1-1.2 times the groove width of the first tooth groove.

[0019] Fourthly, the inclination angle of the first tooth groove relative to the axis of the first extrusion wheel ranges from 20° to 40°.

[0020] In an embodiment of the present application, the conveying assembly comprises at least one of the following features:

[0021] Firstly, the size of the conveying channel along the radial direction of the first extrusion wheel is 0.6-0.8 times the diameter of the solid wire.

[0022] Secondly, the diameter of the first arc-shaped groove is 1.2-1.5 times the diameter of the solid wire.

[0023] Thirdly, the size of the first arc-shaped groove along the axial direction of the first extrusion wheel is 1-1.2 times the diameter of the solid wire.

[0024] In an embodiment of the present application, the first extrusion wheel comprises a gear component and a conveying component, the conveying component is arranged on the side of the gear component and coaxial with the gear component;

[0025] The gear component is in meshing connection with the second extrusion wheel, and the outer wall of the conveying component has the first arc-shaped slot.

[0026] In an embodiment of the present application, the first extrusion wheel comprises at least the following technical features:

[0027] Firstly, the conveying component is at least 1.5 times larger than the first arc-shaped slot along the axial dimension of the first extrusion wheel;

[0028] Secondly, the outer diameter of the gear component is larger than the outer diameter of the conveying component;

[0029] Thirdly, the gear component and the conveying component are in an integral structure.

[0030] In an embodiment of the present application, the second arc-shaped slot has a plurality of concave arranged second tooth grooves, and the plurality of second tooth grooves are arranged at intervals along the circumferential direction of the second extrusion wheel;

[0031] The second tooth part is formed between two axially adjacent second tooth grooves, the first tooth groove and the second tooth groove have the same shape or different shapes;

[0032] The structure of the second extrusion wheel is the same as or different from the structure of the first extrusion wheel.

[0033] An extrusion mechanism comprises a support frame, a driving assembly, and a conveying assembly as described in any of the above technical features;

[0034] The driving assembly is arranged on the support frame, the first extrusion wheel and the second extrusion wheel of the conveying assembly are rotatably arranged on the support frame, and the output end of the driving assembly is in transmission connection with the first extrusion wheel or the second extrusion wheel.

[0035] A 3D printer comprises a frame, a melting mechanism, and an extrusion mechanism as described in the above technical features;

[0036] The extrusion mechanism and the melting mechanism are respectively arranged on the frame, and the extrusion mechanism is used for pushing the solid wire to the melting mechanism.

[0037] After adopting the above technical solutions, the present application has at least the following technical effects:

[0038] The present application discloses a conveying assembly, an extrusion mechanism, and a 3D printer. In the conveying assembly, a first extrusion wheel and a second extrusion wheel are meshed together. The first extrusion wheel has an annular first arc-shaped groove, and the second extrusion wheel has an annular second arc-shaped groove. The first and second arc-shaped grooves are correspondingly arranged and enclose a conveying channel in which a solid filament is located. The groove wall of the first arc-shaped groove has a plurality of recessed first toothed grooves. The plurality of first toothed grooves are spaced apart circumferentially along the first extrusion wheel, and two axially adjacent first toothed grooves form a first tooth portion, which can press against the solid filament.

[0039] This conveying assembly uses a first tooth in a first arc-shaped groove to press against the solid filament in the conveying channel. When the first extrusion wheel and the second extrusion wheel rotate, the first tooth can engage with the solid filament, and the first tooth groove can accommodate part of the solid filament, increasing the contact area between the solid filament and the first tooth. Furthermore, the first tooth can push the solid filament along the conveying channel, preventing the solid filament from slipping. Moreover, by conveying the solid filament through the cooperation of the first tooth and the first tooth groove, continuous conveying of the solid filament can be achieved, ensuring uniform extrusion pressure on the solid filament, avoiding damage and slippage to the surface of the solid filament, and ensuring the stability of the 3D printer's operation. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the conveying component clamping a solid wire in the first embodiment of this application.

[0041] Figure 2 for Figure 1 The top view shown shows the conveyor assembly holding a solid wire.

[0042] Figure 3 for Figure 2 The conveyor assembly shown is a cross-sectional view at A1-A1.

[0043] Figure 4 for Figure 2 The enlarged view of the conveyor assembly shown at point A2.

[0044] Figure 5 for Figure 2 A schematic diagram of the conveying assembly is shown.

[0045] Figure 6 for Figure 1 The front view of the conveyor assembly holding the solid wire is shown.

[0046] Figure 7 for Figure 6 The conveyor assembly shown is a cross-sectional view at A3-A3.

[0047] Figure 8 for Figure 1 A schematic diagram of the first extrusion wheel in the conveying assembly shown.

[0048] Figure 9 Figure 1 shows a schematic view of a first extrusion wheel according to a first embodiment of the present application. Figure 8

[0049] Figure 10 Figure 2 shows a sectional view of the first extrusion wheel of Figure 1 at A4-A4. Figure 9

[0050] Figure 11 Figure 3 shows a partial enlarged view of the first extrusion wheel of Figure 1 at A5. Figure 10

[0051] Figure 12 Figure 4 shows a top view of the first extrusion wheel of Figure 1. Figure 8

[0052] Figure 13 Figure 5 shows a sectional view of the first extrusion wheel of Figure 1 at A6-A6. Figure 12

[0053] Figure 14 Figure 6 shows a partial enlarged view of the first extrusion wheel of Figure 1 at A7. Figure 13

[0054] Figure 15 Figure 7 shows a schematic view of a first extrusion wheel according to a second embodiment of the present application.

[0055] Figure 16 Figure 8 shows a partial enlarged view of the first extrusion wheel of Figure 7 at B. Figure 15

[0056] Figure 9 shows a schematic view of a delivery assembly holding a solid wire according to a third embodiment of the present application. Figure 17

[0057] Figure 18 Figure 10 shows a top view of the first extrusion wheel in the delivery assembly of Figure 9. Figure 17

[0058] Figure 19 Figure 11 shows a sectional view of the first extrusion wheel of Figure 10 at C1-C1. Figure 18

[0059] Figure 20 Figure 12 shows a schematic view of a first extrusion wheel according to a fourth embodiment of the present application. Figure 19

[0060] Figure 21 Figure 13 shows a sectional view of the first extrusion wheel of Figure 12 at C2-C2. Figure 20

[0061] ​​​​​​​​​​​Wherein: 100, conveying assembly; 101, conveying channel; 110, first extrusion wheel; 111, first arc-shaped groove; 1111, first tooth groove; 11111, first recess; 11112, second recess; 1112, first tooth part; 1113, chip containment groove; 112, gear part; 113, conveying part; 120, second extrusion wheel; 121, second arc-shaped groove; 1211, second tooth groove; 1212, second tooth part; 200, solid wire. DETAILED DESCRIPTION

[0062] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is therefore contemplated to cover all such modifications as fall within the scope of the application. It is to be understood that the application is not limited in its application to the details set forth in the description below.

[0063] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0064] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0065] In the present application, unless specifically defined and limited otherwise, if there are terms such as "mount", "connect", "connect", "fix", etc., these terms should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] In the present application, unless specifically defined and limited otherwise, if there are similar descriptions such as "first feature on" or "second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the first feature is lower than the second feature in horizontal height.

[0067] It should be noted that if an element is referred to as "fixed to" or "provided to" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If there is, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes, not the only embodiment.

[0068] It can be understood that generally 3D printers use an extrusion mechanism to transport solid wires to push the solid wires into a melting mechanism and provide pressure for the extrusion of the solid wires during printing. At present, the extrusion mechanism contacts the consumables through an extrusion wheel to achieve the pushing of the consumables. However, the contact area between the extrusion wheel and the consumables is small, and the contact between the extrusion wheel and the consumables is discontinuous, resulting in uneven extrusion force on the consumables, and the surface of the consumables can be damaged, slippery and the like, resulting in poor stability of the 3D printer.

[0069] Therefore, referring to Figures 1 to 3 The present application provides a new type of conveying assembly 100. The conveying assembly 100 is applied to the extrusion mechanism (not shown) of the 3D printer (not shown) to push the solid wires 200. Figure 1 A schematic view of the conveying assembly 100 clamping the solid wires 200 in the first embodiment of the present application, Figure 2 A schematic view of the conveying assembly 100 clamping the solid wires 200 in the first embodiment of the present application, Figure 1A top view of the delivery assembly 100 clamping the solid wire 200, Figure 3 For Figure 2 A cross-sectional view of the delivery assembly 100 at A1-A1.

[0070] The delivery assembly 100 is a component for pushing the solid wire 200 for an extrusion mechanism, the extrusion mechanism provides power for the delivery assembly 100, and the extrusion mechanism is a component of the 3D printer. The delivery assembly 100 can push the solid wire 200 into the melting mechanism (not shown) of the 3D printer. The melting mechanism can heat the solid wire 200 to melt the solid wire 200 into a molten wire melt, and then the melting mechanism extrudes the molten wire melt for 3D printing operation.

[0071] Of course, in other embodiments of the present application, the delivery assembly 100 can also be a wire feeding mechanism applied to devices that need to deliver wire, such as textile equipment and the like. The present application only takes the delivery assembly 100 applied to the extrusion and pushing of the solid for the 3D printer as an example for description.

[0072] In the present application, the solid wire 200 is a printing consumable. Further, the solid wire 200 is described by taking a fused filament, i.e. a thermoplastic wire, as an example. The solid wire 200 can be melted into a molten wire melt after being heated. The delivery assembly 100 is used to push the solid wire 200 and provide extrusion force for the solid wire 200, so that the melting mechanism can extrude the molten wire melt.

[0073] Optionally, the solid wire 200 is made of ABS (Acrylonitrile Butadiene Styrene), PLA (polylactic acid), PETG (amorphous copolyester, Petgplastics), PET (polyethylene terephthalate), etc.

[0074] The delivery assembly 100 can increase the contact area with the solid wire 200 and can realize continuous delivery of the solid wire 200, ensure that the solid wire 200 is subjected to uniform extrusion pressure, avoid damage and slipping of the surface of the solid wire 200, and ensure the stability of the operation of the 3D printer. The specific structure of the delivery assembly 100 of an embodiment is described below.

[0075] Referring to Figures 1 to 7In one embodiment, the conveying assembly 100 includes a first extrusion wheel 110 and a second extrusion wheel 120. The outer wall of the first extrusion wheel 110 has a first arcuate groove 111. The second extrusion wheel 120 is engaged with the first extrusion wheel 110, and the outer wall of the second extrusion wheel 120 has a second arcuate groove 121. The first arcuate groove 111 and the second arcuate groove 121 form a conveying channel 101 for accommodating the solid wire 200. The groove wall of the first arcuate groove 111 has a plurality of recessed first toothed grooves 1111.

[0076] Multiple first toothed grooves 1111 are arranged circumferentially along the first extrusion wheel 110, and a first tooth 1112 is formed between two circumferentially adjacent first toothed grooves 1111. The first tooth 1112 can press against the solid wire 200. Figure 4 for Figure 2 The enlarged view of the conveying assembly 100 at point A2 is shown. Figure 5 for Figure 2 The schematic diagram of the conveying assembly 100 shown is as follows. Figure 6 for Figure 1 The front view shown shows the conveyor assembly 100 clamping the solid wire 200. Figure 7 for Figure 6 The conveyor assembly 100 shown is a cross-sectional view at A3-A3.

[0077] exist Figure 1 In the indicated direction, the circumferential direction of the first extrusion wheel 110 and the second extrusion wheel 120 is circumferential, the radial direction of the first extrusion wheel 110 and the second extrusion wheel 120 is radial, and the rotation axis direction of the first extrusion wheel 110 and the second extrusion wheel 120 is axial. The central axes of the first extrusion wheel 110 and the second extrusion wheel 120 are parallel and are meshed together. The first extrusion wheel 110 and the second extrusion wheel 120 push the main body component of the solid wire 200.

[0078] One of the first extrusion wheel 110 and the second extrusion wheel 120 is driven by the drive assembly (not shown) of the extrusion mechanism, serving as a power wheel. In this application, the first extrusion wheel 110 is driven by the drive assembly. Of course, the second extrusion wheel 120 can also be driven by the drive assembly, the principle of which is essentially the same as that of the first extrusion wheel 110 being driven by the drive assembly, and will not be described again below.

[0079] The first extrusion wheel 110 and the second extrusion wheel 120 are gear-structured and meshed together. When the drive assembly drives the first extrusion wheel 110 to rotate, the first extrusion wheel 110 can drive the second extrusion wheel 120 to rotate through the meshing relationship. Figures 2 to 4As shown, the first extrusion wheel 110 and the second extrusion wheel 120 have a conveying channel 101 passing through therebetween. The solid wire 200 is located in the conveying channel 101, and the first extrusion wheel 110 and the second extrusion wheel 120 can extrude the solid wire 200 and generate extrusion force and friction force between the first extrusion wheel 110 and the second extrusion wheel 120 and the solid wire 200.

[0080] After the first extrusion wheel 110 and the second extrusion wheel 120 clamp the solid wire 200, the first extrusion wheel 110 and the second extrusion wheel 120 extrude the solid wire 200. When the first extrusion wheel 110 and the second extrusion wheel 120 rotate, the first extrusion wheel 110 and the second extrusion wheel 120 generate friction force on the solid wire 200, and the solid wire 200 is pushed by the friction force, i.e., the extrusion force, to the melting mechanism.

[0081] The first extrusion wheel 110 has a first arc-shaped groove 111 recessed on the outer wall of the first extrusion wheel 110, and the second extrusion wheel 120 has a second arc-shaped groove 121 recessed on the outer wall of the second extrusion wheel 120. In this embodiment, the first arc-shaped groove 111 and the second arc-shaped groove 121 are annularly arranged, and of course, in other embodiments of the present application, the first arc-shaped groove 111 and the second arc-shaped groove 121 can also have other shapes. The cross-sectional shape of the first arc-shaped groove 111 along the axial direction of the first extrusion wheel 110 is arc-shaped, and the cross-sectional shape of the second arc-shaped groove 121 along the axial direction of the second extrusion wheel 120 is arc-shaped.

[0082] The first arc-shaped groove 111 and the second arc-shaped groove 121 are correspondingly arranged and surround to form the conveying channel 101. As shown in Figure 1 、 Figure 3 and Figure 6 The conveying channel 101 is arranged between the first extrusion wheel 110 and the second extrusion wheel 120 along the height direction. After the solid wire 200 is located in the conveying channel 101, the outer wall of the solid wire 200 can abut against the groove wall of the first arc-shaped groove 111 and the second arc-shaped groove 121, i.e., the solid wire 200 can abut against the first extrusion wheel 110 and the second extrusion wheel 120. At this time, the first extrusion wheel 110 and the second extrusion wheel 120 can clamp the solid wire 200 and generate extrusion force on the solid wire 200.

[0083] When the first extrusion wheel 110 drives the second extrusion wheel 120 to rotate, the first extrusion wheel 110 and the second extrusion wheel 120 can generate friction force between the first extrusion wheel 110 and the second extrusion wheel 120 and the solid wire 200, and the friction force can be converted into extrusion force to push the solid wire 200 to move in the conveying channel 101. In this way, the solid wire 200 can be pushed to the melting mechanism, and the conveying assembly 100 can push the solid wire 200.

[0084] Moreover, after the solid wire rod 200 is melted into the wire rod melt in the melting mechanism, the flow resistance of the wire rod melt in the melting mechanism is increased, and the conveying assembly 100 can apply an extrusion force to the wire rod melt in the melting mechanism through the solid wire rod 200 after the solid wire rod 200 is pushed by the conveying assembly 100, so that the melting mechanism can extrude the wire rod melt in the melting mechanism.

[0085] It is worth noting that the process of pushing the solid wire rod 200 by the conveying assembly 100 and the process of providing the extrusion force will not be described again hereinafter.

[0086] In order to increase the contact area between the first extrusion wheel 110 and the solid wire rod 200, a plurality of first tooth grooves 1111 are arranged on the groove wall of the first arc-shaped groove 111, the plurality of first tooth grooves 1111 are recessed on the groove wall of the first arc-shaped groove 111 and are arranged at intervals along the circumference of the first extrusion wheel 110. The circumferentially adjacent first tooth grooves 1111 form a first tooth portion 1112. That is, the groove wall of the first arc-shaped groove 111 is arranged in a concave-convex structure, as shown in Figures 1 to 7 .

[0087] After the solid wire rod 200 is located in the conveying channel 101, the first extrusion wheel 110 presses the solid wire rod 200 through the first tooth portion 1112 and the first tooth groove 1111. After the first extrusion wheel 110 and the second extrusion wheel 120 clamp the solid wire rod 200, the first tooth portion 1112 can engage the solid wire rod 200, and the first tooth groove 1111 can also accommodate the solid wire rod 200, as shown in Figure 3 and Figure 7 When the solid wire rod 200 is pushed, the first tooth portion 1112 and the first tooth groove 1111 can push the solid wire rod 200 to move in the conveying channel 101.

[0088] As shown in Figure 3 and Figure 7 , the first extrusion wheel 110 pushes the solid wire rod 200 through the first tooth portion 1112 and the first tooth groove 1111, which can increase the contact area between the first extrusion wheel 110 and the solid wire rod 200, realize the stable conveying of the solid wire rod 200, and avoid the slippage of the solid wire rod 200. Moreover, after the first tooth portion 1112 and the first tooth groove 1111 push the solid wire rod 200, the first tooth portion 1112 and the first tooth groove 1111 can be separated from the solid wire rod 200, which will not peel off the fine particles of the solid wire rod 200 and avoid the damage of the outer wall of the solid wire rod 200.

[0089] Meanwhile, the first extrusion wheel 110 continuously pushes the solid wire 200 through the cooperation of the plurality of first tooth grooves 1111 and the plurality of first tooth portions 1112, so that the first extrusion wheel 110 and the solid wire 200 are in continuous contact, ensuring that the extrusion force on the solid wire 200 is uniform, avoiding damage and slipping of the surface of the solid wire 200, and ensuring the stability of the solid wire 200 delivery.

[0090] The delivery assembly 100 of the above embodiment uses the first tooth portion 1112 in the first arc-shaped groove 111 to press against the solid wire 200 in the delivery channel 101. When the first extrusion wheel 110 and the second extrusion wheel 120 rotate, the first tooth portion 1112 can engage the solid wire 200, and the first tooth groove 1111 can accommodate part of the solid wire 200, increasing the contact area of the solid wire 200 and the first tooth portion 1112, and the first tooth portion 1112 can push the solid wire 200 to move along the delivery channel 101, avoiding the solid wire 200 from slipping. Moreover, by cooperating the first tooth portion 1112 and the first tooth groove 1111 to deliver the solid wire 200, the continuous delivery of the solid wire 200 can be achieved, ensuring that the extrusion force on the solid wire 200 is uniform, avoiding damage and slipping of the surface of the solid wire 200, and ensuring the stability of the 3D printer operation.

[0091] Referring to Figures 1 to 7 In an embodiment, the second arc-shaped groove 121 has a plurality of second tooth grooves 1211 arranged in recessed manner, and the plurality of second tooth grooves 1211 are arranged in spaced apart manner along the circumference of the second extrusion wheel 120. Two axially adjacent second tooth grooves 1211 form a second tooth portion 1212 therebetween, and the second tooth portion 1212 is used to press against the solid wire 200.

[0092] In order to increase the contact area of the second extrusion wheel 120 and the solid wire 200, the present application provides a plurality of second tooth grooves 1211 arranged in recessed manner on the groove wall of the second arc-shaped groove 121, and the plurality of second tooth grooves 1211 are arranged in spaced apart manner along the circumference of the second extrusion wheel 120. The circumferentially adjacent second tooth grooves 1211 form a second tooth portion 1212. That is, the groove wall of the second arc-shaped groove 121 is arranged in concave-convex manner, as shown in Figures 1 to 7 .

[0093] After the solid wire 200 is located in the delivery channel 101, the second extrusion wheel 120 presses the solid wire 200 through the second tooth portion 1212 and the second tooth groove 1211. After the first extrusion wheel 110 and the second extrusion wheel 120 clamp the solid wire 200, the first tooth portion 1112 and the second tooth portion 1212 can engage the solid wire 200, and the first tooth groove 1111 and the second tooth groove 1211 can also accommodate the solid wire 200, as shown in Figure 3 and Figure 7The first tooth portion 1112 and the first tooth groove 1111 press the solid wire 200 on one side of the solid wire 200, and the second tooth portion 1212 and the second tooth groove 1211 press the solid wire 200 on the other side of the solid wire 200, thereby increasing the contact area between the second extrusion wheel 120 and the solid wire 200, achieving stable conveying of the solid wire 200, and avoiding slippage of the solid wire 200.

[0094] As shown in Figure 3 and Figure 7 The first tooth portion 1112 and the first tooth groove 1111 press the solid wire 200 on one side of the solid wire 200, and the second tooth portion 1212 and the second tooth groove 1211 press the solid wire 200 on the other side of the solid wire 200, thereby increasing the contact area between the second extrusion wheel 120 and the solid wire 200, achieving stable conveying of the solid wire 200, and avoiding slippage of the solid wire 200.

[0095] Meanwhile, the first extrusion wheel 110 and the second extrusion wheel 120 can continuously push the solid wire 200, and the first extrusion wheel 110 and the second extrusion wheel 120 are in continuous contact with the solid wire 200, thereby ensuring that the extrusion force on the solid wire 200 is uniform, avoiding damage or slippage of the surface of the solid wire 200, and ensuring the stability of the solid wire 200.

[0096] As shown in Figures 1 to 7 The first tooth portion 1112 and the first tooth groove 1111 are arranged in the first arc-shaped groove 111, and the second tooth portion 1212 and the second tooth groove 1211 are arranged in the second arc-shaped groove 121. In this way, the solid wire 200 can contact the protrusions and the grooves on both sides, respectively, thereby ensuring that the solid wire 200 is uniformly stressed, avoiding rotation or deviation of the solid wire 200, and achieving continuous and stable conveying of the solid wire 200.

[0097] Of course, in other embodiments of the present application, the first tooth groove 1111 and the first tooth portion 1112 can be arranged in the first arc-shaped groove 111, or only the second tooth groove 1211 and the second tooth portion 1212 can be arranged in the second arc-shaped groove 121.

[0098] In an embodiment, the first tooth groove 1111 and the second tooth groove 1211 have the same shape. Of course, in other embodiments, the first tooth groove 1111 and the second tooth groove 1211 can have different shapes. It should be noted that the structure of the first extrusion wheel 110 is the same as that of the second extrusion wheel 120, and of course, the structure of the first extrusion wheel 110 can be different from that of the second extrusion wheel 120, as long as the solid wire 200 can be extruded. Hereinafter, only the first extrusion wheel 110 will be described as an example.

[0099] Referring to Figures 2 to 5In an embodiment, the dimension of the conveying passage 101 along the radial direction of the first extrusion wheel 110 is less than the diameter of the solid wire 200. The dimension of the conveying passage 101 along the radial direction of the first extrusion wheel 110 refers to the distance between the center of the arc surface of the first arc-shaped groove 111 and the center of the arc surface of the second arc-shaped groove 121.

[0100] That is, the dimension of the conveying passage 101 along the radial direction of the first extrusion wheel 110 is equal to the maximum distance between the inner wall of the first arc-shaped groove 111 and the inner wall of the second arc-shaped groove 121, i.e., the width h1 of the conveying passage 101, which is less than the diameter of the solid wire 200. The conveying passage 101 is arranged in an approximately elliptical shape, as shown in Figure 5 After the solid wire 200 is installed into the conveying passage 101, the solid wire 200 and the conveying passage 101 are in an interference fit relationship.

[0101] In this way, the first extrusion wheel 110 can extrude the solid wire 200 through the first tooth portion 1112, and the second extrusion wheel 120 can extrude the solid wire 200 through the second tooth portion 1212, thereby increasing the contact area between the first extrusion wheel 110 and the second extrusion wheel 120 and the solid wire 200. Moreover, when the first extrusion wheel 110 drives the second extrusion wheel 120 to rotate, the first extrusion wheel 110 and the second extrusion wheel 120 can generate a friction force on the solid wire 200 in the first arc-shaped groove 111 and the second arc-shaped groove 121, so as to drive the solid wire 200 to move in the conveying passage 101.

[0102] Referring to Figures 2 to 5 In an embodiment, the dimension of the conveying passage 101 along the radial direction of the first extrusion wheel 110 is 0.6 to 0.8 times the diameter of the solid wire 200. That is, the width h1 of the conveying passage 101 is 0.6 to 0.8 times the diameter of the solid wire 200.

[0103] In this way, after the first extrusion wheel 110 and the second extrusion wheel 120 clamp the solid wire 200, the extrusion force between the first extrusion wheel 110 and the second extrusion wheel 120 and the solid wire 200 can be controlled within a reasonable range, so as to avoid irreversible deformation of the solid wire 200 caused by excessive pressure, and also avoid slippage of the solid wire 200 caused by insufficient pressure, thereby ensuring smooth extrusion of the solid wire 200.

[0104] Preferably, the dimension of the conveying passage 101 along the radial direction of the first extrusion wheel 110 is 0.7 times the diameter of the solid wire 200. That is, the width h1 of the conveying passage 101 is 0.7 times the diameter of the solid wire 200. In this way, the extrusion force of the first extrusion wheel 110 and the second extrusion wheel 120 clamping the solid wire 200 can be controlled within a reasonable range, thereby achieving smooth extrusion of the solid wire 200.

[0105] Referring to Figure 1 ,Figures 8 to 11 In one embodiment, the diameter of the first arc-shaped groove 111 is 1.2 to 1.5 times the diameter of the solid wire 200. Figure 8 for Figure 1 A schematic diagram of the first extrusion wheel 110 in the conveying assembly 100 shown. Figure 9 for Figure 8 The front view of the first extrusion wheel 110 shown is shown. Figure 10 for Figure 9 The first extrusion wheel 110 shown is a cross-sectional view at A4-A4. Figure 11 for Figure 10 The first extrusion wheel 110 shown is a partial enlarged view at point A5.

[0106] The diameter d of the first arc-shaped groove 111 is as follows: Figure 11 As shown. When the diameter d of the first arc groove 111 is within the above range, the first arc groove 111 can guide the movement of the solid wire 200 in the conveying channel 101, ensuring that the solid wire 200 can move accurately in the conveying channel 101.

[0107] This avoids the problem of excessive curvature caused by an excessively large diameter of the first arc-shaped groove 111, thereby preventing radial displacement of the solid wire 200 within the first arc-shaped groove 111 and ensuring the accuracy of the solid wire 200's movement in the conveying channel 101. Simultaneously, it also avoids the problem of insufficient curvature caused by an excessively small diameter of the first arc-shaped groove 111, increasing the extrusion area between the solid wire 200 and the first arc-shaped groove 111, and preventing damage to the solid wire 200.

[0108] Preferably, the diameter of the first arc-shaped groove 111 is 1.4 times the diameter of the solid wire 200. The diameter d of the first arc-shaped groove 111 is also 1.4 times the diameter of the solid wire 200. In this way, the first arc-shaped groove 111 can guide the movement of the solid wire 200 in the conveying channel 101, ensuring that the solid wire 200 can move accurately in the conveying channel 101.

[0109] See Figure 1 , Figures 8 to 11 In one embodiment, the dimension of the first arc-shaped groove 111 along the axial direction of the first extrusion wheel 110 is 1 to 1.2 times the diameter of the solid wire 200. The dimension h2 of the first arc-shaped groove 111 along the axial direction of the first extrusion wheel 110 is the width of the first arc-shaped groove 111.

[0110] After the width h2 of the first arc groove 111 is within the above range, the first arc groove 111 can effectively limit the radial displacement of the solid wire 200. At the same time, it can also have enough space to absorb the deformation of the solid wire 200 during extrusion, ensuring that the solid wire 200 can be extruded smoothly.

[0111] Preferably, the first arc-shaped groove 111 has an axial dimension along the first extrusion wheel 110 of 1.1 times the diameter of the solid wire 200. In this way, the first arc-shaped groove 111 can effectively limit the deviation of the solid wire 200 in the radial direction, while also having sufficient space to absorb the deformation amount of the solid wire 200 during extrusion, ensuring that the solid wire 200 can be smoothly extruded.

[0112] Referring to Figure 8 、 Figures 12 to 14 In an embodiment, the distance between two circumferentially adjacent first tooth grooves 1111 is 0.1mm-0.2mm. Figure 12 For Figure 8 a top view of the first extrusion wheel 110, Figure 13 a sectional view of the first extrusion wheel 110 at A6-A6, Figure 12 a sectional view of the first extrusion wheel 110 at A7, Figure 14 a sectional view of the first extrusion wheel 110 at A7, Figure 13 a local enlarged view of the first extrusion wheel 110 at A7.

[0113] The distance between two adjacent first tooth grooves 1111 along the circumference of the first extrusion wheel 110 is the tooth width f. When the tooth width f of the two adjacent first tooth grooves 1111 is within the above range, the engagement effect of the first tooth portion 1112 on the solid wire 200 can be ensured, and the contact area between the first extrusion wheel 110 and the solid wire 200 can be increased.

[0114] Preferably, the distance between two circumferentially adjacent first tooth grooves 1111 is 0.1mm. The tooth width f of the two adjacent first tooth grooves 1111 is 0.1mm. In this way, the engagement effect of the first tooth portion 1112 on the solid wire 200 can be ensured, and the contact area between the first extrusion wheel 110 and the solid wire 200 can be increased.

[0115] Referring to Figure 14 In an embodiment, the groove width of each first tooth groove 1111 along the circumference of the first extrusion wheel 110 is 0.4mm-0.5mm. The dimension of the first tooth groove 1111 along the circumference of the first extrusion wheel 110 is the groove width g. When the groove width g of the first tooth groove 1111 is within the above range, the first extrusion wheel 110 can simultaneously engage the solid wire 200 through multiple first tooth grooves 1111 and multiple first tooth portions 1112, increase the continuity of the engagement between the first extrusion wheel 110 and the solid wire 200, and realize the continuous pushing of the solid wire 200.

[0116] Preferably, the width of each first tooth groove 1111 along the circumference of the first extrusion wheel 110 is 0.5 mm. The width g of the first tooth groove 1111 is 0.5 mm. In this way, the first extrusion wheel 110 can simultaneously engage the solid wire 200 through multiple first tooth grooves 1111 and multiple first tooth portions 1112, increasing the continuity of the engagement between the first extrusion wheel 110 and the solid wire 200, and achieving continuous pushing of the solid wire 200.

[0117] Referring to Figure 14 In an embodiment, the depth of each first tooth groove 1111 recessed in the groove wall of the first arc-shaped groove 111 is 1-1.2 times the width of the first tooth groove 1111. The dimension of the first tooth groove 1111 along the axial direction of the first extrusion wheel 110, i.e., the depth h3 of the first tooth groove 1111. The relationship between the depth h3 of the first tooth groove 1111 and the width g of the first tooth groove 1111 is in the above range, the first tooth groove 1111 can accommodate the debris of the solid wire 200, and avoid the debris filling the first tooth groove 1111, increase the contact area between the first extrusion wheel 110 and the solid wire 200, avoid the situation of slipping when pushing the solid wire 200.

[0118] Preferably, the depth of each first tooth groove 1111 recessed in the groove wall of the first arc-shaped groove 111 is 1.2 times the width of the first tooth groove 1111. The depth h3 of the first tooth groove 1111 is 1.2 times the width g of the first tooth groove 1111. In this way, it can be avoided that the debris of the solid wire 200 fills the first tooth groove 1111, and the stable conveying of the solid wire 200 is realized, and the slipping of the solid wire 200 is avoided.

[0119] Referring to Figure 12 In an embodiment, the inclination angle of the first tooth groove 1111 relative to the axial direction of the first extrusion wheel 110 is in the range of 20°-40°. The first tooth groove 1111 is inclined relative to the rotation axis O of the first extrusion wheel 110. The inclination angle e between the first tooth groove 1111 and the rotation axis O is in the above range, the first extrusion wheel 110 can simultaneously engage the solid wire 200 through multiple first tooth grooves 1111 and multiple first tooth portions 1112, increase the continuity of the engagement between the first extrusion wheel 110 and the solid wire 200, and achieve continuous pushing of the solid wire 200.

[0120] Preferably, the inclination angle of the first tooth groove 1111 relative to the axial direction of the first extrusion wheel 110 is in the range of 40°. In this way, the first extrusion wheel 110 can simultaneously engage the solid wire 200 through multiple first tooth grooves 1111 and multiple first tooth portions 1112, increase the continuity of the engagement between the first extrusion wheel 110 and the solid wire 200, and achieve continuous pushing of the solid wire 200.

[0121] Referring to Figure 1 , Figure 4 ,Figure 8 and Figure 10 In an embodiment, the first extrusion wheel 110 comprises a gear part 112 and a conveying part 113, the conveying part 113 is arranged at the side of the gear part 112 and coaxial with the gear part 112. The gear part 112 is engaged with the second extrusion wheel 120, and the outer wall of the conveying part 113 has the first arc-shaped groove 111.

[0122] That is, the first extrusion wheel 110 is divided into two parts along the axial direction, one part is the gear part 112 with gear teeth, and the other part is the conveying part 113 with the first arc-shaped groove 111. The gear part 112 is coaxially arranged with the conveying part 113. The outer wall of the conveying part 113 has the annular first arc-shaped groove 111, which is recessed on the outer wall of the conveying part 113 and surrounded by the second arc-shaped groove 121 to form the conveying channel 101.

[0123] The gear part 112 is engaged with the second extrusion wheel 120. When the driving assembly drives the gear part 112 to rotate, the gear part 112 drives the second extrusion wheel 120 to rotate synchronously through the engagement relationship. At this time, the friction between the first arc-shaped groove 111 and the second arc-shaped groove 121 and the solid wire 200 is generated to realize the pushing of the solid wire 200. Correspondingly, the second wheel body also comprises a gear part 112 and a conveying part 113, which will not be described in detail here.

[0124] Referring to Figure 1 , Figure 4 , Figure 8 and Figure 10 In an embodiment, the outer diameter of the gear part 112 is greater than or equal to the outer diameter of the conveying part 113. That is, the outer wall of the conveying part 113 is recessed relative to the gear part 112. In this way, when the gear part 112 is engaged with the second extrusion wheel 120, there can be a certain spacing between the conveying part 113 and the second extrusion wheel 120 to form the conveying channel 101, so as to avoid interference between the first extrusion wheel 110 and the second extrusion wheel 120.

[0125] In an embodiment, the gear part 112 and the conveying part 113 are an integral structure. That is, the first extrusion wheel 110 is an integral structure. In this way, the structural strength of the first extrusion wheel 110 as a whole can be ensured to stably convey the solid wire 200.

[0126] Referring to Figure 10 and Figure 11 In an embodiment, the conveying part 113 is at least greater than or equal to 1.5 times the axial dimension of the first arc-shaped groove 111 along the first extrusion wheel 110. The axial dimension of the conveying part 113 along the first extrusion wheel 110 is the width h4 of the conveying part 113.

[0127] The relationship between the width h4 of the conveying component 113 and the width h2 of the first arc-shaped groove 111 is within the above range, which can ensure that the first arc-shaped groove 111 is completely arranged on the outer wall of the conveying component 113, and at the same time, the structural strength of the conveying component 113 can be ensured to stably clamp the solid wire 200, thereby ensuring the overall quality of the first extrusion wheel 110.

[0128] Preferably, the conveying component 113 is 1.5 times the axial dimension of the first arc-shaped groove 111 along the axial dimension of the first extrusion wheel 110. The width h4 of the conveying component 113 is 1.5 times the width h2 of the first arc-shaped groove 111. In this way, the first arc-shaped groove 111 can be completely arranged on the outer wall of the conveying component 113, and at the same time, the structural strength of the conveying component 113 can be ensured to stably clamp the solid wire 200, thereby ensuring the overall quality of the first extrusion wheel 110.

[0129] Referring to Figure 1 , Figure 15 and Figure 17 , in an embodiment, each first tooth groove 1111 includes a first recess 11111 and a second recess 11112, the first recess 11111 and the second recess 11112 are arranged obliquely along the radial direction of the first extrusion wheel 110 and are oblique to the rotation axis O of the first extrusion wheel 110 and opposite to each other. The first recess 11111 and the second recess 11112 are in communication, or the first recess 11111 and the second recess 11112 are at least partially arranged in staggered manner. Figure 15 FIG. 2 is a schematic view of the first extrusion wheel 110 of the second embodiment of the present application, Figure 17 FIG. 3 is a schematic view of the conveying assembly 100 clamping the solid wire 200 of the third embodiment of the present application.

[0130] That is, the first tooth groove 1111 includes two recesses, namely a first recess 11111 and a second recess 11112, the first recess 11111 and the second recess 11112 are arranged obliquely with respect to the rotation axis O of the first extrusion wheel 110, and the oblique directions of the first recess 11111 and the second recess 11112 are opposite to each other. That is, there is an included angle between the first recess 11111 and the second recess 11112.

[0131] When the first extrusion wheel 110 extrudes the solid wire 200, the first recess 11111 and the second recess 11112 can clamp the solid wire 200 on both sides, increase the contact area between the first extrusion wheel 110 and the solid wire 200, avoid the solid wire 200 from slipping, and realize stable conveying of the solid wire 200.

[0132] In an embodiment, the first recess 11111 and the second recess 11112 are one of a straight-line type, a curved-line type, a straight-line splicing type, a curved-line splicing type, and a straight-line and curved-line splicing type. That is, the shapes of the first recess 11111 and the second recess 11112 are not limited in principle as long as they can engage the solid wire 200.

[0133] In the present application, the first recess 11111 and the second recess 11112 are both arranged in a straight-line type. Of course, in other embodiments of the present application, the first recess 11111 and the second recess 11112 can also be other shapes, such as a curved-line type, etc.

[0134] In an embodiment, the shapes of the first recess 11111 and the second recess 11112 are the same or different. In the present application, the shapes of the first recess 11111 and the second recess 11112 are the same. Of course, in other embodiments of the present application, the shapes of the first recess 11111 and the second recess 11112 can also be opposite.

[0135] Referring to Figures 1 to 12 In the first embodiment of the present application, the first recess 11111 and the second recess 11112 are arranged in a V-shaped type. That is, the first tooth groove 1111 and the first tooth 1112 are both arranged in a V-shaped type. In this way, when the first extrusion wheel 110 and the second extrusion wheel 120 rotate, the first tooth groove 1111 and the second tooth groove 1211 are in contact with the outer wall of the solid wire 200, as shown in Figure 6 .

[0136] The first tooth groove 1111 and the second tooth groove 1211 can increase the contact area thereof with the solid wire 200, avoid slippage of the solid wire 200, and ensure the extrusion force of the solid wire 200. At the same time, the extrusion force of the first extrusion wheel 110 and the second extrusion wheel 120 on the solid wire 200 is distributed in multiple points, as shown in Figure 6 . In this way, the extrusion force received by the solid wire 200 is uniform, ensuring stable extrusion force.

[0137] In the present embodiment, the first tooth groove 1111 retains the advantages of uniform helical gear extrusion force and stable movement. At the same time, by arranging the first recess 11111 and the second recess 11112 with opposite directions on both sides of the movement direction of the solid wire 200, the first recess 11111 and the second recess 11112 engage the solid wire 200 on both sides of the solid wire 200, the first tooth groove 1111 and the second tooth groove 1211 can guide the solid wire 200, avoid the solid wire 200 from deviating and rotating in the conveying channel 101, and improve the efficiency and reliability of extrusion.

[0138] Referring to Figure 15 and Figure 16In the second embodiment of this application, the first recess 11111 and the second recess 11112 are offset from each other along the circumference of the first extrusion wheel 110. The first recess 11111 and the second recess 11112 are offset in a herringbone shape. Figure 16 for Figure 15 The enlarged view of the first extrusion wheel 110 at point B is shown.

[0139] That is, the first tooth groove 1111 and the first tooth 1112 are arranged in a herringbone shape. In this way, when the first extrusion wheel 110 and the second extrusion wheel 120 rotate, the first tooth groove 1111 and the second tooth groove 1211 can increase their contact area with the solid wire 200, avoid the solid wire 200 from slipping, and ensure the extrusion force of the solid wire 200.

[0140] In this embodiment, the first tooth groove 1111 retains the advantages of uniform extrusion force and smooth movement of the oblique tooth. At the same time, by arranging the first recess 11111 and the second recess 11112 with opposite directions on both sides of the solid wire 200, the first recess 11111 and the second recess 11112 bite the solid wire 200 on both sides, avoiding the solid wire 200 from shifting and rotating in the conveying channel 101, thereby improving the efficiency and reliability of extrusion.

[0141] See Figure 17 and Figure 18 In the third embodiment of this application, the first recess 11111 and the second recess 11112 are V-shaped. That is, both the first groove 1111 and the first tooth 1112 are V-shaped. It is worth noting that the structure of the first groove 1111 in this embodiment is actually the same as the structure of the first groove 1111 in the first embodiment, except that a chip-receiving groove 1113 is provided in the first arc-shaped groove 111 in this embodiment. Figure 18 for Figure 17 A top view of the first extrusion wheel 110 in the conveying assembly 100 shown.

[0142] See Figures 18 to 21 Optionally, the inner wall of the first arc-shaped groove 111 also has an annular chip-receiving groove 1113. The chip-receiving groove 1113 is recessed between the first recessed portion 11111 and the second recessed portion 11112, and connects the first recessed portion 11111 and the second recessed portion 11112. The groove depth of the chip-receiving groove 1113 is greater than the groove depth of the first recessed portion 11111 and the second recessed portion 11112. Figure 19 for Figure 18 The first extrusion wheel 110 shown is a cross-sectional view at C1-C1. Figure 20 for Figure 19 The front view of the first extrusion wheel 110 shown is shown. Figure 21 for Figure 20The cross-sectional view of the first extrusion wheel 110 at C2-C2 is shown.

[0143] That is, the chip groove 1113 is arranged in the first tooth groove 1111, as shown. Figure 19 and Figure 21 After the chip groove 1113 is added between the first recessed part 11111 and the second recessed part 11112, the chip groove 1113 can accommodate the debris of the solid wire 200. Moreover, during the rotation of the first extrusion wheel 110, the chip groove 1113 can discharge the debris of the solid wire 200, avoiding the adhesion of the debris in the first tooth groove 1111 to cause the slip of the solid wire 200.

[0144] Of course, in other embodiments of the present application, the first tooth groove 1111 and the second tooth groove 1211 in the first extrusion wheel 110 and the second extrusion wheel 120 can adopt different tooth groove shapes. For example, the first extrusion wheel 110 adopts a herringbone-shaped tooth groove, and the second extrusion wheel 120 adopts a V-shaped tooth groove; or, the first extrusion wheel 110 adopts a V-shaped tooth groove, and the second extrusion wheel 120 adopts a herringbone-shaped tooth groove, etc.

[0145] In the conveying assembly 100 of the present application, the first extrusion wheel 110 and the second extrusion wheel 120 are meshingly connected, and the first arc-shaped groove 111 of the first extrusion wheel 110 and the second arc-shaped groove 121 of the second extrusion wheel 120 surround to form a conveying channel 101. The groove wall of the first arc-shaped groove 111 has a first tooth groove 1111 and a first tooth part 1112, and the groove wall of the second arc-shaped groove 121 has a second tooth groove 1211 and a second tooth part 1212. The first extrusion wheel 110 and the second extrusion wheel 120 extrude the solid wire 200.

[0146] During extrusion, the driving assembly transmits power to the first extrusion wheel 110, and the first extrusion wheel 110 and the second extrusion wheel 120 extrude the solid wire 200. During extrusion, the first tooth part 1112, the first tooth groove 1111, the second tooth part 1212, and the second tooth groove 1211 engage the solid wire 200. With the rotation of the first extrusion wheel 110 and the second extrusion wheel 120, the solid wire 200 is pushed to move under the engagement, realizing the pushing of the solid wire 200.

[0147] During the pushing of the solid wire 200, the first arc-shaped groove 111 and the second arc-shaped groove 121 can guide and extrude the solid wire 200. The first tooth part 1112, the first tooth groove 1111, the second tooth part 1212, and the second tooth groove 1211 can engage the solid wire 200, increase the contact area between the first extrusion wheel 110, the second extrusion wheel 120, and the solid wire 200, avoid the slip of the solid wire 200, and ensure the extrusion force of the solid wire 200.

[0148] Meanwhile, the first tooth groove 1111 and the second tooth groove 1211 retain the advantages of uniform extrusion force and smooth movement of the oblique teeth. At the same time, by arranging the first recess 11111 and the second recess 11112 in opposite directions on both sides of the solid wire 200, the first recess 11111 and the second recess 11112 bite the solid wire 200 on both sides, avoiding the solid wire 200 from shifting and rotating in the conveying channel 101, realizing the continuous pushing of the solid wire 200, and improving the efficiency and reliability of extrusion.

[0149] This application also provides an extrusion mechanism, including a support frame (not shown), a drive assembly, and a conveying assembly 100 as described in any of the above embodiments. The drive assembly is disposed on the support frame, and a first extrusion wheel 110 and a second extrusion wheel 120 in the conveying assembly 100 are rotatably disposed for the support frame. The output end of the drive assembly is drively connected to the first extrusion wheel 110 or the second extrusion wheel 120.

[0150] The support frame serves as the overall framework for the extrusion mechanism, with all other components of the extrusion mechanism housed within it, thus integrating the extrusion mechanism into a single, unified structure. Furthermore, after the extrusion mechanism is mounted onto the 3D printer's frame, it is secured to the frame via the support frame, thus fixing the extrusion mechanism to the 3D printer.

[0151] The drive assembly is the power source for the extrusion mechanism. It is mounted on the support frame, and its output end is connected to the first extrusion wheel 110. When the drive assembly is working, it can drive the first extrusion wheel 110 to rotate the second extrusion wheel 120, thereby pushing the solid wire 200.

[0152] The conveying assembly 100 of this application, when using the conveying assembly 100 of the above embodiment, can increase its contact area with the solid wire 200, prevent the solid wire 200 from slipping, and ensure the extrusion force of the solid wire 200. At the same time, it can stably convey the solid wire 200, prevent the solid wire 200 from shifting and rotating in the conveying channel 101, realize the continuous pushing of the solid wire 200, and improve the efficiency and reliability of extrusion.

[0153] In one embodiment, the drive assembly includes a drive member and a drive wheel. The drive member is disposed on a support frame, and the output end of the drive member is connected to the drive wheel. The drive wheel is rotatably disposed on the support frame and engages with a first extrusion wheel 110 or a second extrusion wheel 120.

[0154] The driving member is a power source of the extrusion mechanism, and is arranged on the support frame. The driving wheel is rotatably arranged on the support frame and at the output end of the driving member. The driving wheel is also connected with the first extrusion wheel 110. When the driving member drives the driving wheel to rotate, the driving wheel can drive the first extrusion wheel 110 to rotate, and then the first extrusion wheel 110 drives the second extrusion wheel 120 to rotate, so as to push the solid wire 200.

[0155] Optionally, the driving member is an electric motor. In an embodiment, the support frame is a frame structure. Of course, the support frame can also be a support housing, and the driving wheel, the first extrusion wheel 110 and the second extrusion wheel 120 are rotatably arranged in the support housing.

[0156] The application also provides a 3D printer, which comprises a frame, a melting mechanism and an extrusion mechanism as in the above embodiments. The extrusion mechanism and the melting mechanism are arranged on the frame, and the extrusion mechanism is used to push the solid wire 200 to the melting mechanism.

[0157] The 3D printer of the application can increase the contact area between the extrusion mechanism and the solid wire 200, avoid the slippage of the solid wire 200, and ensure the extrusion force of the solid wire 200 after using the extrusion mechanism of the above embodiments. At the same time, the solid wire 200 can be stably conveyed, the deviation and rotation of the solid wire 200 in the conveying channel 101 can be avoided, the continuous pushing of the solid wire 200 can be realized, and the efficiency and reliability of the extrusion can be improved.

[0158] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the description.

[0159] The above embodiments only express several implementation manners of the application, and the description is more specific and detailed, but it should not be understood as the limitation of the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the application, some modifications and improvements can be made, which are all within the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A delivery assembly characterized by, The extrusion assembly comprises: a first extrusion wheel, an outer wall of the first extrusion wheel having a first arc-shaped groove; and a second extrusion wheel, meshing connected with the first extrusion wheel, an outer wall of the second extrusion wheel having a second arc-shaped groove, the first arc-shaped groove and the second arc-shaped groove surrounding a conveying channel for accommodating a solid wire; wherein, a groove wall of the first arc-shaped groove has a plurality of first tooth grooves arranged concavely, the plurality of first tooth grooves being arranged at intervals along a circumferential direction of the first extrusion wheel, a first tooth part being formed between two circumferentially adjacent first tooth grooves, the first tooth part being capable of pressing the solid wire.

2. The delivery assembly of claim 1, wherein, Each of the first tooth grooves comprises a first concave part and a second concave part, the first concave part and the second concave part being arranged obliquely along a radial direction of the first extrusion wheel and obliquely towards opposite directions relative to an axis of rotation of the first extrusion wheel; the first concave part and the second concave part are in communication, or the first concave part and the second concave part are arranged at least partially staggered.

3. The delivery assembly of claim 2, wherein, The first tooth groove comprises at least one of the following features: firstly, the first concave part and the second concave part are one of a straight-line type groove, a curve type groove, a straight-line splicing type groove, a curve splicing type groove and a straight-line and curve splicing type groove; secondly, the first concave part and the second concave part are identical or different in shape; thirdly, an inner wall of the first arc-shaped groove further has an annular chip accommodating groove, the chip accommodating groove being arranged concavely between the first concave part and the second concave part and being in communication with the first concave part and the second concave part, a groove depth of the chip accommodating groove being greater than groove depths of the first concave part and the second concave part.

4. The delivery assembly of claim 1, wherein, The first tooth groove comprises at least one of the following features: firstly, a distance between two circumferentially adjacent first tooth grooves is 0.1mm-0.2mm; secondly, a groove width of each of the first tooth grooves along the circumferential direction of the first extrusion wheel is 0.4mm-0.5mm; thirdly, a groove depth of each of the first tooth grooves concavely arranged in the groove wall of the first arc-shaped groove is 1-1.2 times of the groove width of the first tooth groove; fourthly, an oblique angle of the first tooth groove relative to an axial direction of the first extrusion wheel ranges from 20° to 40°.

5. The delivery assembly of claim 1, wherein, The conveying assembly comprises at least one of the following features: firstly, a size of the conveying channel along the radial direction of the first extrusion wheel is 0.6-0.8 times of a diameter of the solid wire; secondly, a diameter of the first arc-shaped groove is 1.2-1.5 times of the diameter of the solid wire; thirdly, a size of the first arc-shaped groove along the axial direction of the first extrusion wheel is 1-1.2 times of the diameter of the solid wire.

6. The delivery assembly of claim 1, wherein, The first extrusion wheel comprises a gear part and a conveying part, the conveying part being arranged on a side surface of the gear part and coaxial with the gear part; the gear part is meshing connected with the second extrusion wheel, an outer wall of the conveying part having the first arc-shaped groove.

7. The delivery assembly of claim 6, wherein, The first extrusion wheel comprises at least the following technical features: firstly, an axial size of the conveying part along the first extrusion wheel is at least 1.5 times of an axial size of the first arc-shaped groove along the first extrusion wheel. The second gear component has an outer diameter larger than an outer diameter of the conveying component; The third gear component is integrated with the conveying component.

8. The delivery assembly of any of claims 1-7, wherein, The second arc-shaped slot has a plurality of concave second tooth slots arranged thereon, and the second tooth slots are arranged along a circumferential direction of the second extrusion wheel; Two axially adjacent second tooth slots form a second tooth part for pressing the solid wire, and the first tooth slot has the same shape as the second tooth slot or a different shape from the second tooth slot; The second extrusion wheel has the same structure as the first extrusion wheel or a different structure from the first extrusion wheel.

9. An extrusion mechanism characterized by, The support frame, the driving assembly, and the conveying assembly as claimed in any one of claims 1 to 8 are included; The driving assembly is arranged on the support frame, and the first extrusion wheel and the second extrusion wheel of the conveying assembly are rotatably arranged on the support frame, and an output end of the driving assembly is in transmission connection with the first extrusion wheel or the second extrusion wheel.

10. A 3D printer characterized by, The machine frame, the melting mechanism, and the extrusion mechanism as claimed in claim 9 are included; The extrusion mechanism and the melting mechanism are respectively arranged on the machine frame, and the extrusion mechanism is used for pushing the solid wire to the melting mechanism.

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