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, the first extrusion wheel comprises a first wheel body and a first wrapping wheel, the first wrapping wheel is arranged on at least part of the outer wall of the first wheel body in a sleeving mode, and a first arc-shaped groove is formed in the outer wall of the first wrapping wheel; a second arc-shaped groove is formed in the outer wall of the second extrusion wheel; the first wheel body is in meshed connection with the second extrusion wheel, and a conveying channel for conveying solid wires is defined by the first arc-shaped groove and the second arc-shaped groove; and the first coating wheel is made of a deformable material and can be in contact with the solid wire rod. In the extrusion process, the first wrapping wheel generates extrusion force between the first wrapping wheel and the solid wire through self deformation, the first wrapping wheel is attached to the surface of the solid wire in a large area, friction force between the first extrusion wheel and the solid wire is increased, normal extrusion of the solid wire is guaranteed, meanwhile, the solid wire is prevented from being extruded, deformed and abraded by hard materials, and pushing of the solid wire is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 3D printing, in particular to a conveying assembly, an extrusion mechanism and a 3D printer. BACKGROUND

[0002] The 3D printer of Fused Deposition Modeling (FDM type) usually adopts solid wire as printing consumables. The 3D printer adopts the Fused Deposition Manufacturing technology to melt the consumables and extrude the molten consumables. The 3D printer adopts the extrusion mechanism to convey the solid wire, so as to push the solid wire into the melting mechanism and provide pressure for the extrusion of the solid wire in the printing process.

[0003] At present, the extrusion mechanism contacts the consumables through the extrusion wheel to realize the pushing of the consumables. However, the contact area of the extrusion wheel and the consumables is small, the friction force borne by the consumables in the extrusion process is small, the consumables are easy to slip, and the stability of the 3D printer is poor.

[0004] Meanwhile, when the extrusion wheel contacts the consumables, the extrusion wheel will produce indentation and wear on the consumables, which affects the strength of the consumables and causes the consumables to bend and other situations in the pushing process, which is not convenient for the pushing of the consumables into the melting mechanism. Invention content

[0005] Therefore, it is necessary to provide a conveying assembly, an extrusion mechanism and a 3D printer in view of the problems of slippage, poor strength of the consumables and stripping of small particles of the consumables caused by the pushing of the consumables by the extrusion wheel at present, which can increase the contact area with the solid wire, ensure the normal extrusion of the solid wire, avoid the slippage of the solid wire in the pushing process, and avoid the deformation and wear of the solid wire caused by the extrusion of the hard material, so as to facilitate the pushing of the solid wire.

[0006] A conveying assembly comprises:

[0007] A first extrusion wheel comprises a first wheel body and a first covering wheel, the first covering wheel is sleeved on at least part of the outer wall of the first wheel body, and the outer wall of the first covering wheel has a first arc-shaped groove; and

[0008] A second extrusion wheel, the outer wall of the second extrusion wheel has a second arc-shaped groove;

[0009] The first wheel body is engagedly connected with the second extrusion wheel, and the first arc-shaped groove and the second arc-shaped groove surround to form a conveying channel for conveying the solid wire;

[0010] The first covering wheel is made of a deformable material and can contact the solid wire.

[0011] In an embodiment of the present application, the first wheel body 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;

[0012] The gear component is engaged with the second extrusion wheel, the outer wall of the conveying component has a first mounting groove, and the first covering wheel is arranged in the first mounting groove.

[0013] In an embodiment of the present application, the first covering wheel comprises protrusions, and a plurality of the protrusions are arranged in the first arc-shaped groove to increase the friction between the first covering wheel and the solid wire;

[0014] The protrusions are one or more combinations of cylindrical protrusions, conical protrusions, linear protrusions, curved protrusions, linearly spliced protrusions, curvedly spliced protrusions, and linearly and curvedly spliced protrusions.

[0015] In an embodiment of the present application, the conveying assembly at least comprises any one of the following features:

[0016] Firstly, the size of the conveying channel along the radial direction of the first extrusion wheel is 1 / 3-2 / 3 of the diameter of the solid wire;

[0017] Secondly, the size of the first covering wheel along the axial direction of the first extrusion wheel is at least greater than or equal to twice the diameter of the solid wire;

[0018] Thirdly, the minimum size of the first covering wheel along the radial direction of the first extrusion wheel is at least greater than or equal to twice the diameter of the solid wire.

[0019] In an embodiment of the present application, the first covering wheel is made of rubber material;

[0020] The hardness of the first covering wheel ranges from 70HA to 100HA.

[0021] In an embodiment of the present application, the first extrusion wheel at least comprises the following technical features:

[0022] Firstly, the outer diameter of the gear component is greater than the outer diameter of the conveying component;

[0023] Secondly, the gear component and the conveying component are an integral structure;

[0024] Thirdly, the outer wall of the first covering wheel is coplanar with the outer wall of the conveying component.

[0025] In an embodiment of the present application, the second extrusion wheel comprises a second wheel body and a second covering wheel, the second covering wheel is sleeved on at least part of the outer wall of the second wheel body, the second wheel body is engaged with the first wheel body, and the outer wall of the second covering wheel has the second arc-shaped groove, and the second covering wheel is made of a deformable material.

[0026] The structure of the second wheel body is the same as that of the first wheel body, and the structure of the second covering wheel is the same as that of the first covering wheel.

[0027] An extrusion mechanism comprises a support frame, a driving assembly, and the conveying assembly as any one of the technical features described above.

[0028] 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 driving connection with the first extrusion wheel or the second extrusion wheel.

[0029] In an embodiment of the present application, the driving assembly comprises a driving member and a driving wheel, the driving member is arranged on the support frame, the output end of the driving member is connected to the driving wheel, the driving wheel is rotatably arranged on the support frame, and the driving wheel is engaged with the first extrusion wheel or the second extrusion wheel.

[0030] And / or, the support frame comprises a first support and a second support, the first support is arranged on the second support and surrounds a mounting space, and the driving wheel, the first extrusion wheel and the second extrusion wheel are located in the mounting space.

[0031] A 3D printer comprises a frame, a melting mechanism, and the extrusion mechanism as any one of the technical features described above.

[0032] The extrusion mechanism and the melting mechanism are respectively arranged on the frame, and the extrusion mechanism is used to push the solid wire to the melting mechanism.

[0033] After adopting the technical solutions described above, the present application has at least the following technical effects:

[0034] The conveying assembly, the extrusion mechanism and the 3D printer of the present application, in the conveying assembly, the first covering wheel of the first extrusion wheel is sleeved on at least part of the outer wall of the first wheel body, the first covering wheel has the first arc-shaped groove, and the first covering wheel is made of a deformable material. The outer wall of the second extrusion wheel has the second arc-shaped groove, the first wheel body is engaged with the second extrusion wheel, the first arc-shaped groove and the second arc-shaped groove surround the conveying channel, and the solid wire passes through the conveying channel. When the first extrusion wheel and the second extrusion wheel rotate, the solid wire in the conveying channel can be extruded and rubbed to push the solid wire.

[0035] The conveying assembly, the deformable first covering wheel is arranged outside the first wheel body, the first extrusion wheel contacts the solid wire through the first covering wheel, and the deformable first covering wheel directly contacts the solid wire. In the extrusion process, the first covering wheel generates extrusion force between the solid wire by itself deformation, large area adheres to the surface of the solid wire, increases the contact area between the first extrusion wheel and the solid wire, and then increases the friction between the first extrusion wheel and the solid wire, ensures that the solid wire is extruded normally, avoids the situation that the solid wire slips when pushing the solid wire, and avoids that the solid wire is extruded and deformed by hard material, wear and tear, and facilitates pushing of the solid wire. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism.

[0037] Figure 2 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism. Figure 1 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism.

[0038] Figure 3 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism. Figure 2 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism.

[0039] Figure 4 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism. Figure 2 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism.

[0040] Figure 5 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism. Figure 2 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism.

[0041] Figure 6 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism. Figure 5 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism.

[0042] Figure 7 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism. Figure 3 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism.

[0043] Figure 8 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism. Figure 7 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism.

[0044] Figure 9 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism. Figure 5 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism.

[0045] Figure 10 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism. Figure 9 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism.

[0046] Figure 11 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism. Figure 5 The schematic view of the conveying assembly of an embodiment of the application applied to the extrusion mechanism.

[0047] Figure 12 As shown in the first extrusion wheel of the second deformation figure. Figure 5

[0048] Figure 13 As shown in the first extrusion wheel of the third deformation figure. Figure 5

[0049] Figure 14 As shown in the first extrusion wheel of the fourth deformation figure. Figure 5

[0050] 10, extrusion mechanism; 100, conveying assembly; 101, conveying channel; 110, first extrusion wheel; 111, first wheel body; 1111, gear part; 1112, conveying part; 11121, first mounting groove; 112, first covering wheel; 1121, first arc-shaped groove; 120, second extrusion wheel; 121, second wheel body; 122, second covering wheel; 1221, second arc-shaped groove; 130, protruding part; 200, driving assembly; 210, driving piece; 220, driving wheel; 300, support frame; 310, first support; 320, second support; 40, solid wire. DETAILED DESCRIPTION

[0051] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to 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 ways other than those specifically described herein, and the skilled person can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0052] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like 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.

[0053] ​​​In addition, the terms "first", "second", and the like, if any, are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or implicating the number of indicated technical features. Thus, a feature defined with "first", "second" may explicitly or implicitly include at least one of the features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0054] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. 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 explicitly 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.

[0055] In the present application, unless otherwise explicitly specified and limited, if the first feature is described as "on" or "under" the second feature and the like, it can mean 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 second feature, or it can only mean 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 second feature, or it can only mean that the first feature is lower than the second feature in horizontal height.

[0056] It should be noted that if an element is referred to as "fixed to" or "disposed 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 present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0057] It can be understood that the 3D printer uses an extrusion mechanism to transport the solid wire to push the solid wire into the melting mechanism and provide pressure for the extrusion of the solid wire during the printing process. At present, the extrusion mechanism contacts the consumables through an extrusion wheel to realize the pushing of the consumables. However, the contact area of the extrusion wheel and the consumables is small, the friction force of the consumables during the extrusion process is small, the consumables are easy to slip, and the stability of the 3D printer is poor. At the same time, when the extrusion wheel contacts the consumables, it will produce indentation and wear on the consumables, affecting the strength of the consumables, causing the consumables to bend during the pushing process, and not convenient for the consumables to be pushed into the melting mechanism.

[0058] Therefore, referring to Figures 1 to 3 , the application provides a novel conveying assembly 100. The conveying assembly 100 is applied to the extrusion mechanism 10 of the 3D printer to push the solid wire 40. Figure 1 The conveying assembly 100 of an embodiment of the application is applied to the schematic diagram of the extrusion mechanism 10, Figure 2 The conveying assembly 100 is shown in the schematic diagram of the conveying assembly 100 conveying the solid wire 40. Figure 1

[0059] Moreover, the conveying assembly 100 is a component of the extrusion mechanism 10 for pushing the solid wire 40, the extrusion mechanism 10 provides power for the conveying assembly 100, and the extrusion mechanism 10 is a component of the 3D printer (not shown). The conveying assembly 100 can push the solid wire 40 into the melting mechanism (not shown) of the 3D printer. The melting mechanism can heat the solid wire 40 to melt the solid wire 40 into a molten wire melt, and then the melting mechanism extrudes the molten wire melt in a molten state to perform a 3D printing operation.

[0060] Of course, in other embodiments of the application, the conveying assembly 100 can also be a wire feeding mechanism applied to devices such as textile equipment and the like that need to convey wire. The application only takes the conveying assembly 100 applied to the extrusion and pushing of the solid wire of the 3D printer as an example for description.

[0061] In the application, the solid wire 40 is a printing consumable. Further, the solid wire 40 takes a fused filament, i.e. a thermoplastic wire, as an example for description. The solid wire 40 can be melted into a molten wire melt after being heated. The conveying assembly 100 is used to push the solid wire 40 and provide extrusion force for the solid wire 40, so that the melting mechanism can extrude the molten wire melt in a molten state.

[0062] ​Optionally, the solid wire 40 is made of ABS (Acrylonitrile Butadiene Styrene), PLA (polylactic acid), PETG (amorphous copolyester, Petgplastics), PET (Polyethylene terephthalate) and the like.

[0063] The conveying assembly 100 can increase the contact area with the solid wire 40, thereby increasing the friction between the solid wire 40, ensuring that the solid wire 40 can be normally extruded, avoiding the situation that the solid wire 40 slips when being pushed, and avoiding that the solid wire 40 is deformed and worn by hard material extrusion, facilitating the pushing of the solid wire 40.

[0064] The specific structure of the conveying assembly 100 of an embodiment is introduced below.

[0065] Referring to Figures 1 to 6 In an embodiment, the conveying assembly 100 includes a first extrusion wheel 110 and a second extrusion wheel 120. The first extrusion wheel 110 includes a first wheel body 111 and a first covering wheel 112, the first covering wheel 112 is sleeved on at least part of the outer wall of the first wheel body 111, and the outer wall of the first covering wheel 112 has a first arc-shaped groove 1121. The outer wall of the second extrusion wheel 120 has a second arc-shaped groove 1221. The first wheel body 111 and the second extrusion wheel 120 are engagedly connected. The first arc-shaped groove 1121 and the second arc-shaped groove 1221 surround to form a conveying channel 101 for conveying the solid wire 40.

[0066] The first covering wheel 112 is made of a deformable material and can be in contact with the solid wire 40. Figure 3 To Figure 2 The top view of the conveying assembly 100 shown in Figure 4 The schematic view of the conveying assembly 100 shown in Figure 2 The schematic view of the first extrusion wheel 110 shown in Figure 5 The exploded schematic view of the first extrusion wheel 110 shown in Figure 2 The exploded schematic view of the first extrusion wheel 110 shown in Figure 6 The exploded schematic view of the first extrusion wheel 110 shown in Figure 5 The exploded schematic view of the first extrusion wheel 110 shown in

[0067] In Figures 2 to 4 The circumferential direction of the first extrusion wheel 110 and the second extrusion wheel 120 is the circumferential direction, the radial direction of the first extrusion wheel 110 and the second extrusion wheel 120 is the radial direction, the first extrusion wheel 110 and the second extrusion wheel 120 are engagedly connected, and the first extrusion wheel 110 and the second extrusion wheel 120 push the solid wire 40 to the melting mechanism.

[0068] The first extrusion wheel 110 is in transmission connection with the driving assembly 200 (mentioned later) of the extrusion mechanism 10 as a driving wheel. In this application, the first extrusion wheel 110 is in transmission connection with the driving assembly 200. Of course, the second extrusion wheel 120 can also be in transmission connection with the driving assembly 200, and the principle is substantially the same as that of the first extrusion wheel 110 in transmission connection with the driving assembly 200, which will not be described again later.

[0069] The first extrusion wheel 110 and the second extrusion wheel 120 are gear structures and are in meshing connection. When the driving assembly 200 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. The first extrusion wheel 110 and the second extrusion wheel 120 have a conveying channel 101 penetrating therebetween. The solid wire 40 is located in the conveying channel 101, and the first extrusion wheel 110 and the second extrusion wheel 120 can extrude the solid wire 40 and generate extrusion force and friction between the first extrusion wheel 110 and the second extrusion wheel 120 and the solid wire 40.

[0070] After the first extrusion wheel 110 and the second extrusion wheel 120 clamp the solid wire 40, the first extrusion wheel 110 and the second extrusion wheel 120 extrude the solid wire 40. 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 on the solid wire 40, and then push the solid wire 40 through the friction, that is, the extrusion force, and the solid wire 40 is pushed into the melting mechanism under the action of the extrusion force.

[0071] Specifically, the first extrusion wheel 110 includes a first wheel body 111 and a first covering wheel 112. In this embodiment, the first covering wheel 112 is annularly arranged, so that the first covering wheel 112 can be sleeved on at least part of the outer wall of the first wheel body 111, as shown in Figure 6 The first covering wheel 112 has a first arc-shaped groove 1121 which is recessed on the outer wall of the first covering wheel 112.

[0072] The outer wall of the second extrusion wheel 120 has a second arc-shaped groove 1221. In this embodiment, the first arc-shaped groove 1121 and the second arc-shaped groove 1221 are annularly arranged. Of course, in other embodiments of the application, the first arc-shaped groove 1121 and the second arc-shaped groove 1221 can also have other shapes.

[0073] The first wheel body 111 can be in meshing connection with the second extrusion wheel 120, and the first arc-shaped groove 1121 and the second arc-shaped groove 1221 are correspondingly arranged and surround to form the conveying channel 101. The cross-sectional shape of the first arc-shaped groove 1121 along the axial direction of the first extrusion wheel 110 is arc-shaped, and the cross-sectional shape of the second arc-shaped groove 1221 along the axial direction of the second extrusion wheel 120 is arc-shaped.

[0074] As shown in Figures 2 to 4 The conveying passage 101 is arranged between the first covering wheel 112 and the second extrusion wheel 120 along the height direction. After the solid wire 40 is located in the conveying passage 101, the outer surface of the solid wire 40 can abut against the inner wall of the first arc-shaped groove 1121 and the inner wall of the second arc-shaped groove 1221, that is, the solid wire 40 can abut against the first covering wheel 112 and the second extrusion wheel 120. At this time, the first covering wheel 112 and the second extrusion wheel 120 can clamp the solid wire 40 and generate an extrusion force on the solid wire 40.

[0075] When the first extrusion wheel 110 drives the second extrusion wheel 120 to rotate, the first covering wheel 112 and the second extrusion wheel 120 can generate a friction force with the solid wire 40, and the friction force can be converted into an extrusion force to push the solid wire 40 to move in the conveying passage 101. In this way, the solid wire 40 can be pushed to the melting mechanism, and the conveying assembly 100 can push the solid wire 40.

[0076] Moreover, after the solid wire 40 is melted into a wire melt in the melting mechanism, the flow resistance of the wire melt in the melting mechanism becomes large, and after the conveying assembly 100 pushes the solid wire 40, the conveying assembly 100 can apply an extrusion force to the wire melt in the melting mechanism through the solid wire 40, so that the melting mechanism can extrude the wire melt.

[0077] It is worth noting that the process of pushing the solid wire 40 by the conveying assembly 100 and the process of providing the extrusion force will not be described again hereinafter.

[0078] In this application, the first covering wheel 112 is made of a deformable material, and the first wheel body 111 is made of a hard material. The first covering wheel 112 can be deformed under stress. When the solid wire 40 is located in the conveying passage 101, the first extrusion wheel 110 contacts the solid wire 40 through the first covering wheel 112.

[0079] Moreover, when the first extrusion wheel 110 and the second extrusion wheel 120 generate an extrusion force on the solid wire 40, the first covering wheel 112 can be deformed under the action of the extrusion force, so that the first covering wheel 112 covers part of the outer wall of the solid wire 40. That is, the first covering wheel 112 and the solid wire 40 are in flexible contact.

[0080] In this way, the first coating wheel 112 can adhere to the outer wall of the solid wire 40 over a large area. Compared with the current method of contacting the solid wire with a hard wheel, the first coating wheel 112 of this application can greatly increase the contact area between the first extrusion wheel 110 and the solid wire 40, thereby increasing the friction between the first extrusion wheel 110 and the solid wire 40, preventing the solid wire 40 from slipping during the pushing process, and ensuring the stability of the solid wire 40 conveying.

[0081] Meanwhile, since the first coating wheel 112 and the solid wire 40 are in flexible contact, the first coating wheel 112 will not squeeze the solid wire 40, causing the solid wire 40 to deform. In this way, the solid wire 40 will not bend during the pushing process, and the solid wire 40 will remain in a straight line as it is pushed into the melting mechanism, avoiding blockage of the solid wire 40 in the melting mechanism and facilitating the pushing of the solid wire 40.

[0082] Furthermore, since the first extrusion wheel 110 and the solid wire 40 are in flexible contact, the first extrusion wheel 110 will not cause indentations or wear to the solid wire 40 during the process of pushing the solid wire 40, thus ensuring the structural strength of the solid wire 40. Moreover, the first extrusion wheel 110 will not peel off the fine particles of the solid wire 40, avoiding the falling of fine particles that may affect the cleanliness of the conveying component 100 and ensuring the stability of the operation of the conveying component 100.

[0083] In the above embodiment, the conveying assembly 100 has a deformable first covering wheel 112 disposed on the outer side of the first wheel body 111. The first extrusion wheel 110 contacts the solid wire 40 through the first covering wheel 112, allowing the deformable first covering wheel 112 to directly contact the solid wire 40. During the extrusion process, the first covering wheel 112 generates extrusive force between itself and the solid wire 40 through its own deformation, adhering to the surface of the solid wire 40 over a large area, increasing the contact area between the first extrusion wheel 110 and the solid wire 40, thereby increasing the friction between the first extrusion wheel 110 and the solid wire 40, ensuring normal extrusion of the solid wire 40, avoiding slippage when pushing the solid wire 40, and preventing the solid wire 40 from being deformed or worn by hard materials, thus facilitating the pushing of the solid wire 40.

[0084] See Figure 3 , Figure 7 and Figure 8 In one embodiment, the second extrusion wheel 120 includes a second wheel body 121 and a second covering wheel 122. The second covering wheel 122 is sleeved on at least a portion of the outer wall of the second wheel body 121. The second wheel body 121 engages with the first wheel body 111. The second covering wheel 122 has a second arcuate groove 1221. The second covering wheel 122 is made of a deformable material. Figure 7 for Figure 3 The cross-sectional view of the conveyor assembly 100 shown at point AA.Figure 8 For Figure 7 A local enlarged view of the conveying assembly 100 at B.

[0085] In this embodiment, the second covering wheel 122 is annularly arranged and sleeved on at least part of the outer wall of the second wheel body 121. The outer wall of the second covering wheel 122 has a second arc-shaped groove 1221 recessed in the outer wall of the second covering wheel 122. The first wheel body 111 can be engaged with the second wheel body 121 to enable the first covering wheel 112 to be correspondingly arranged with the second covering wheel 122, and thus the first arc-shaped groove 1121 and the second arc-shaped groove 1221 are correspondingly arranged and surround the conveying channel 101.

[0086] Moreover, the second covering wheel 122 is made of a deformable material, and the second wheel body 121 is made of a hard material. The second covering wheel 122 can be deformed under force. When the solid wire 40 is located in the conveying channel 101, the first extrusion wheel 110 contacts the solid wire 40 through the first covering wheel 112, and the second extrusion wheel 120 contacts the solid wire 40 through the second covering wheel 122.

[0087] Moreover, when the first extrusion wheel 110 and the second extrusion wheel 120 generate extrusion force on the solid wire 40, the first covering wheel 112 and the second covering wheel 122 can be deformed under the extrusion force due to the deformability of the first covering wheel 112 and the second covering wheel 122, so that the first covering wheel 112 and the second covering wheel 122 are covered on the outer wall of the solid wire 40 at the corresponding positions. That is, the first covering wheel 112 and the second covering wheel 122 are in flexible contact with the solid wire 40.

[0088] In this way, the first covering wheel 112 and the second covering wheel 122 can be in large-area adhesion with the outer wall of the solid wire 40. Compared with the current mode of contacting the solid wire by a hard wheel, the first covering wheel 112 and the second covering wheel 122 of the present application can greatly increase the contact area between the first extrusion wheel 110 and the second extrusion wheel 120 and the solid wire 40, thereby increasing the friction between the first extrusion wheel 110 and the second extrusion wheel 120 and the solid wire 40, avoiding slippage of the solid wire 40 during pushing, and ensuring the stability of the solid wire 40 conveying.

[0089] In this embodiment, the first extrusion wheel 110 and the second extrusion wheel 120 can each be provided with a covering wheel. In this way, the first covering wheel 112 and the second covering wheel 122 can be in flexible contact with the solid wire 40, increasing the contact area between the conveying assembly 100 and the solid wire 40 and realizing stable conveying of the solid wire 40. Of course, the first covering wheel 112 can also be arranged only on the first extrusion wheel 110, or the second covering wheel 122 can also be arranged only on the second extrusion wheel 120.

[0090] The first extrusion wheel 110 and the second extrusion wheel 120 are both provided with the covering wheel. The structure of the second wheel body 121 is the same as that of the first wheel body 111, and the structure of the second covering wheel 122 is the same as that of the first covering wheel 112. Hereinafter, only the structure of the first extrusion wheel 110 is introduced.

[0091] In an embodiment, the first wheel body 111 and the second wheel body 121 are made of hard material. In this way, the first wheel body 111 can support the first covering wheel 112, and the second wheel body 121 can support the second covering wheel 122. Exemplarily, the first wheel body 111 and the second wheel body 121 are made of metal material. Of course, in other embodiments of the present application, the first wheel body 111 and the second wheel body 121 can also be made of hard plastic material or the like.

[0092] In an embodiment, the first covering wheel 112 and the second covering wheel 122 are both made of rubber material. That is, the deformable material in the present application is rubber. Alternatively, the first covering wheel 112 and the second covering wheel 122 are made of ethylene-propylene rubber, silicone rubber, fluororubber, fluorosilicone rubber or other materials capable of producing deformation.

[0093] Alternatively, the first covering wheel 112 and the second covering wheel 122 are not allowed to exude grease. After the first covering wheel 112 and the second covering wheel 122 are made of rubber material, the first covering wheel 112 and the second covering wheel 122 are not allowed to exude grease. In this way, the friction between the first covering wheel 112, the second covering wheel 122 and the solid wire 40 can be ensured, and the solid wire 40 can be prevented from slipping.

[0094] Alternatively, the hardness of the first covering wheel 112 and the second covering wheel 122 ranges from 70HA to 100HA. After the first covering wheel 112 and the second covering wheel 122 are made of rubber material with the hardness in the above range, the structural strength of the first covering wheel 112 and the second covering wheel 122 can be ensured, so that the first covering wheel 112 and the second covering wheel 122 can withstand greater extrusion force and friction.

[0095] Alternatively, the surface roughness of the first covering wheel 112 and the second covering wheel 122 ranges from Ra3.2μm to Ra6.4μm. After the first covering wheel 112 and the second covering wheel 122 are made of rubber material, the surface roughness of the first arc-shaped groove 1121 and the second arc-shaped groove 1221 needs to be ensured in the above range, so that the friction between the first covering wheel 112, the second covering wheel 122 and the solid wire 40 can be ensured.

[0096] Referring to Figure 3 , Figures 6 to 8In 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 40. 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 of the first arc-shaped groove 1121 and the center of the arc of the second arc-shaped groove 1221.

[0097] 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 1121 and the inner wall of the second arc-shaped groove 1221, i.e., the width h1 of the conveying passage 101, which is less than the diameter of the solid wire 40. The conveying passage 101 is substantially elliptical, as shown in Figure 8 When the solid wire 40 is installed into the conveying passage 101, the solid wire 40 and the conveying passage 101 are in an interference fit.

[0098] In this way, the first extrusion wheel 110 can extrude the solid wire 40 through the first coating wheel 112, and the second extrusion wheel 120 can extrude the solid wire 40 through the second coating wheel 122, thereby increasing the contact area between the first extrusion wheel 110 and the second extrusion wheel 120 and the solid wire 40. 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 frictional force on the solid wire 40 in the first arc-shaped groove 1121 and the second arc-shaped groove 1221, so as to drive the solid wire 40 to move in the conveying passage 101.

[0099] Referring to Figure 3 , Figures 6 to 8 In an embodiment, the dimension of the conveying passage 101 along the radial direction of the first extrusion wheel 110 is 1 / 3 to 2 / 3 of the diameter of the solid wire 40. That is, the width h1 of the conveying passage 101 is 1 / 3 to 2 / 3 of the diameter of the solid wire 40. In this way, after the first extrusion wheel 110 and the second extrusion wheel 120 clamp the solid wire 40, the extrusion force between the first extrusion wheel 110 and the second extrusion wheel 120 and the solid wire 40 can be ensured, so as to ensure the extrusion force when the solid wire 40 is pushed.

[0100] Preferably, the dimension of the conveying passage 101 along the radial direction of the first extrusion wheel 110 is 1 / 2 of the diameter of the solid wire 40. That is, the width h1 of the conveying passage 101 is 1 / 2 of the diameter of the solid wire 40. In this way, after the first extrusion wheel 110 and the second extrusion wheel 120 clamp the solid wire 40, the extrusion force between the first extrusion wheel 110 and the second extrusion wheel 120 and the solid wire 40 can be ensured, so as to ensure the extrusion force when the solid wire 40 is pushed.

[0101] Referring to Figure 5 , Figure 6 , Figure 9 and Figure 10In an embodiment, the first covering wheel 112 has a dimension along the axial direction of the first extruding wheel 110 that is at least twice the diameter of the solid wire 40. Figure 9 As shown in the front view of the first extruding wheel 110, Figure 5 As shown in the front view of the first extruding wheel 110, Figure 10 As shown in the front view of the first extruding wheel 110, Figure 9 As shown in the cross-sectional view of the first extruding wheel 110 at C-C.

[0102] The dimension of the first covering wheel 112 along the axial direction of the first extruding wheel 110, i.e. the width h2 of the first covering wheel 112, is shown in Figure 10 The width h2 of the first covering wheel 112 is at least twice the diameter of the solid wire 40. In this way, the first covering wheel 112 has a certain width along the axial direction of the first extruding wheel 110, so as to avoid the first covering wheel 112 being damaged by extrusion and to ensure the reliability of the first covering wheel 112 in use.

[0103] Preferably, the dimension of the first covering wheel 112 along the axial direction of the first extruding wheel 110 is twice the diameter of the solid wire 40. The width h2 of the first covering wheel 112 is twice the diameter of the solid wire 40. In this way, the first covering wheel 112 has a certain width along the axial direction of the first extruding wheel 110, so as to avoid the first covering wheel 112 being damaged by extrusion and to ensure the reliability of the first covering wheel 112 in use.

[0104] Referring to Figure 5 , Figure 6 , Figure 9 and Figure 10 In an embodiment, the minimum dimension of the first covering wheel 112 along the radial direction of the first extruding wheel 110 is at least twice the diameter of the solid wire 40. The minimum dimension of the first covering wheel 112 along the radial direction of the first extruding wheel 110 refers to the radial dimension from the center of the arc of the first arc-shaped groove 1121 to the inner wall of the first covering wheel 112.

[0105] As shown in Figure 10 , the minimum dimension of the first covering wheel 112 along the radial direction of the first extruding wheel 110 is h3, which is at least twice the diameter of the solid wire 40. In this way, the first covering wheel 112 has a certain thickness along the radial direction of the first extruding wheel 110. In this way, the solid wire 40 can be prevented from being deformed and worn by the hard points of the first covering wheel 112, so as to ensure the stability of the pushing of the solid wire 40.

[0106] Preferably, the minimum dimension of the first covering wheel 112 along the radial direction of the first extruding wheel 110 is twice the diameter of the solid wire 40. As shown in Figure 10As shown, the minimum dimension of the first covering wheel 112 along the radial direction of the first extruding wheel 110 is h3, which is three times the diameter of the solid wire 40. In this way, the first covering wheel 112 has a certain thickness along the radial direction of the first extruding wheel 110. In this way, the deformation and wear of the solid wire 40 caused by the hard points of the first covering wheel 112 can be avoided, and the stability of the pushing of the solid wire 40 can be ensured.

[0107] Optionally, the bottom wall of the first covering wheel 112 is an arc surface and is arranged in parallel with the first arc-shaped groove 1121. In this way, the dimension of the first covering wheel 112 along the radial direction of the first extruding wheel 110 is equal everywhere. Of course, in other embodiments of the present application, the bottom wall of the first covering wheel 112 can also be a plane. In this way, the minimum dimension of the first covering wheel 112 along the radial direction of the first extruding wheel 110 is the distance from the center of the arc of the first arc-shaped groove 1121 to the plane.

[0108] Referring to Figures 2 to 6 , Figure 9 and Figure 10 , in an embodiment, the first wheel body 111 includes a gear part 1111 and a conveying part 1112, the conveying part 1112 is arranged on the side of the gear part 1111 and is coaxial with the gear part 1111. The gear part 1111 is engagedly connected with the second extruding wheel 120, and the outer wall of the conveying part 1112 has a first mounting groove 11121, and the first covering wheel 112 is arranged in the first mounting groove 11121.

[0109] That is, the first extruding wheel 110 is divided into two parts along the axial direction, one part is the gear part 1111 having a tooth part, and the other part is the conveying part 1112 in which the first covering wheel 112 is arranged. The gear part 1111 is arranged coaxially with the conveying part 1112. The outer wall of the conveying part 1112 has the first mounting groove 11121. The shape of the first mounting groove 11121 is matched with the shape of the first covering wheel 112. The first covering wheel 112 is arranged in the first mounting groove 11121, and the first covering wheel 112 can be arranged correspondingly with the second covering wheel 122 and enclose the conveying passage 101.

[0110] The gear part 1111 is engagedly connected with the second extruding wheel 120. When the driving assembly 200 drives the gear part 1111 to rotate, the gear part 1111 drives the second extruding wheel 120 to rotate synchronously through the engagement relationship. At this time, the frictional force between the first covering wheel 112, the second covering wheel 122 and the solid wire 40 is generated, and the pushing of the solid wire 40 is realized. Correspondingly, the second wheel body 121 also includes a gear part 1111 and a conveying part 1112.

[0111] Referring to Figures 2 to 4In an embodiment, the outer diameter of the gear component 1111 is larger than the outer diameter of the conveying component 1112. That is, the outer wall of the conveying component 1112 is concavely arranged relative to the gear component 1111. In this way, when the gear component 1111 meshes with the second wheel body 121, a certain spacing can exist between the first covering wheel 112 and the second covering wheel 122 to form the conveying channel 101, so as to avoid interference between the first covering wheel 112 and the second covering wheel 122.

[0112] In an embodiment, the gear component 1111 and the conveying component 1112 are in an integral structure. That is, the first wheel body 111 is in an integral structure. In this way, the structural strength of the first wheel body 111 as a whole can be ensured to stably convey the solid wire 40.

[0113] Referring to Figure 5 and Figure 6 In an embodiment, the outer wall of the first covering wheel 112 is coplanar with the outer wall of the conveying component 1112. After the first covering wheel 112 is provided with the first arc-shaped groove 1121, two limiting edges will be formed on both sides of the first arc-shaped groove 1121, and the two limiting edges and the bottom wall surround the first arc-shaped groove 1121.

[0114] The outer wall of the limiting edge is coplanar with the outer wall of the conveying component 1112. That is, the first covering wheel 112 will not protrude from the conveying component 1112 to avoid interference with the second covering wheel 122, and at the same time, the first covering wheel 112 will not be concavely arranged relative to the conveying component 1112 to avoid scratching the solid wire 40 by the conveying component 1112.

[0115] Referring to Figures 11 to 14 In an embodiment, the first covering wheel 112 includes a protruding portion 130, and a plurality of protruding portions 130 are arranged in the first arc-shaped groove 1121 to increase the friction between the first covering wheel 112 and the solid wire 40. Figure 11 For Figure 5 a first deformed view of the first extrusion wheel 110 shown in Figure 12 a second deformed view of the first extrusion wheel 110 shown in Figure 5 a third deformed view of the first extrusion wheel 110 shown in Figure 13 a fourth deformed view of the first extrusion wheel 110 shown in Figure 5 a fourth deformed view of the first extrusion wheel 110 shown in Figure 14 a fourth deformed view of the first extrusion wheel 110 shown in Figure 5 a fourth deformed view of the first extrusion wheel 110 shown in

[0116] The protruding portion 130 is arranged in the first arc-shaped groove 1121, and when the first covering wheel 112 contacts the solid wire 40, the protruding portion 130 can abut against the outer wall of the solid wire 40 to increase the friction coefficient and further increase the friction between the first covering wheel 112 and the solid wire 40, so that the solid wire 40 has greater extrusion force.

[0117] It is worth mentioning that the shape of the protrusions 130 is not limited in principle as long as it can increase the friction between the first covering wheel 112 and the solid wire 40. In an embodiment, the protrusions 130 are one or more combinations of cylindrical protrusions, conical protrusions, straight protrusions, curved protrusions, straight spliced protrusions, curved spliced protrusions, and straight and curved spliced protrusions.

[0118] As shown in FIG. 1, the protrusions 130 in the first arc-shaped groove 1121 are conical protrusions. Figure 11 As shown in FIG. 2, the protrusions 130 in the first arc-shaped groove 1121 are straight protrusions, which extend along the radial direction of the first extrusion wheel 110. Figure 12 As shown in FIG. 3, the protrusions 130 in the first arc-shaped groove 1121 are arc-shaped protrusions. Figure 13 As shown in FIG. 4, straight spliced protrusions, such as chevron-shaped protrusions, are arranged in the first arc-shaped groove 1121. Figure 14

[0119] Optionally, the protrusions 130 can be arranged only in the first arc-shaped groove 1121, or can be arranged in both the first arc-shaped groove 1121 and the second arc-shaped groove 1221. Optionally, the shapes and layouts of the protrusions 130 in the first arc-shaped groove 1121 and the second arc-shaped groove 1221 are the same or different.

[0120] The conveying assembly 100 of the present application is provided with the deformable first covering wheel 112 outside the first wheel body 111 and the second covering wheel 122 outside the second wheel body 121. During the extrusion process, the first covering wheel 112 and the second covering wheel 122 generate extrusion force between themselves and the solid wire 40 through deformation, and are in large-area contact with the surface of the solid wire 40, thereby increasing the contact area between the first extrusion wheel 110 and the second extrusion wheel 120 and the solid wire 40, and further increasing the friction between the first extrusion wheel 110 and the second extrusion wheel 120 and the solid wire 40, so as to ensure the normal extrusion of the solid wire 40, avoid the slippage of the solid wire 40 during pushing, and avoid the deformation and wear of the solid wire 40 caused by extrusion by hard materials, thereby facilitating the pushing of the solid wire 40.

[0121] Referring to FIG. 5, the present application further provides an extrusion mechanism 10, which comprises a support frame 300, a driving assembly 200, and the conveying assembly 100 according to any one of the above embodiments. The driving assembly 200 is arranged on the support frame 300, the first extrusion wheel 110 and the second extrusion wheel 120 in the conveying assembly 100 are rotatably arranged on the support frame 300, and the output end of the driving assembly 200 is in transmission connection with the first extrusion wheel 110 or the second extrusion wheel 120. Figure 1

[0122] ​​The support frame 300 is an overall frame of the extrusion mechanism 10, and other components of the extrusion mechanism 10 are arranged in the support frame 300, so that the extrusion mechanism 10 is integrated into a whole structure. After the extrusion mechanism 10 is installed on the rack of the 3D printer, the extrusion mechanism 10 is installed on the rack through the support frame 300, so that the extrusion mechanism 10 is fixed to the 3D printer.

[0123] The driving assembly 200 is a power source of the extrusion mechanism 10, and the driving assembly 200 is arranged in the support frame 300 and is in transmission connection with the first extrusion wheel 110 at an output end. When the driving assembly 200 works, the driving assembly 200 can drive the first extrusion wheel 110 to rotate, so as to drive the second extrusion wheel 120 to rotate, and realize the pushing of the solid wire 40.

[0124] After the extrusion mechanism 10 adopts the conveying assembly 100 of the above embodiment, the contact area between the conveying assembly 100 and the solid wire 40 can be increased, and then the friction between the conveying assembly 100 and the solid wire 40 can be increased, so as to ensure the normal extrusion of the solid wire 40, avoid the slippage of the solid wire 40 during the pushing, and avoid the deformation and wear of the solid wire 40 caused by the extrusion of the hard material, and facilitate the pushing of the solid wire 40.

[0125] Referring to Figure 1 In an embodiment, the driving assembly 200 includes a driving member 210 and a driving wheel 220, the driving member 210 is arranged in the support frame 300, an output end of the driving member 210 is connected with the driving wheel 220, the driving wheel 220 is rotatably arranged in the support frame 300 and is in engagement with the first extrusion wheel 110 or the second extrusion wheel 120.

[0126] The driving member 210 is a power source of the extrusion mechanism 10, the driving member 210 is arranged in the support frame 300, the driving wheel 220 is rotatably arranged in the support frame 300 and is arranged at an output end of the driving member 210. The driving wheel 220 is also in engagement with the first extrusion wheel 110. When the driving member 210 drives the driving wheel 220 to rotate, the driving wheel 220 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 realize the pushing of the solid wire 40. Optionally, the driving member 210 is a motor.

[0127] Referring to Figure 1 In an embodiment, the support frame 300 includes a first support 310 and a second support 320, the first support 310 is arranged in the second support 320 and surrounds an installation space, and the driving wheel 220, the first extrusion wheel 110 and the second extrusion wheel 120 are located in the installation space.

[0128] The first support 310 and the second support 320 are fixedly connected by a threaded part, the driving wheel 220, the first extrusion wheel 110 and the second extrusion wheel 120 are rotatably arranged on the first support 310 and the second support 320 and located in the accommodating space. The first support 310 and the second support 320 can protect the driving wheel 220, the first extrusion wheel 110 and the second extrusion wheel 120, avoid other components or sundries from entering the gear transmission conveying assembly 100, and ensure the stability of the extrusion mechanism 10.

[0129] The application also provides a 3D printer, which comprises a rack, a melting mechanism and the extrusion mechanism 10 in any of the above embodiments. The extrusion mechanism 10 and the melting mechanism are arranged on the rack, and the extrusion mechanism 10 is used for pushing the solid wire 40 to the melting mechanism.

[0130] The 3D printer of the application can increase the contact area between the conveying assembly 100 and the solid wire 40 after adopting the extrusion mechanism 10 of the above embodiments, thereby increasing the friction between the conveying assembly 100 and the solid wire 40, ensuring the normal extrusion of the solid wire 40, avoiding the slippage of the solid wire 40 during pushing, and avoiding the deformation and wear of the solid wire 40 caused by extrusion of hard materials, thereby facilitating the pushing of the solid wire 40.

[0131] 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, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0132] 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 a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which are all within the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A delivery assembly characterized by, The first extrusion wheel comprises a first wheel body and a first covering wheel, the first covering wheel is sleeved on at least part of the outer wall of the first wheel body, the outer wall of the first covering wheel has a first arc-shaped groove; And The second extrusion wheel, the outer wall of the second extrusion wheel has a second arc-shaped groove; The first wheel body is in meshing connection with the second extrusion wheel, the first arc-shaped groove and the second arc-shaped groove surround a conveying channel for conveying solid wires; The first covering wheel is made of deformable material and can be in contact with the solid wires. The first wheel body comprises a gear component and a conveying component, the conveying component is arranged on the side surface of the gear component and is coaxial with the gear component; 2. The delivery assembly of claim 1, wherein, The gear component is in meshing connection with the second extrusion wheel, the outer wall of the conveying component has a first mounting groove, and the first covering wheel is arranged in the first mounting groove. The first covering wheel comprises protrusions, a plurality of the protrusions are arranged in the first arc-shaped groove, and the protrusions are used for increasing the friction between the first covering wheel and the solid wires; 3. The delivery assembly of claim 1, wherein, The protrusions are one or more combinations of cylindrical protrusions, conical protrusions, linear protrusions, curved protrusions, linearly spliced protrusions, curvedly spliced protrusions, and linearly and curvedly spliced protrusions. The conveying assembly at least comprises any one of the following features:

4. The delivery assembly of claim 1, wherein, Firstly, the dimension of the conveying channel along the radial direction of the first extrusion wheel is 1 / 3-2 / 3 of the diameter of the solid wires; Secondly, the dimension of the first covering wheel along the axial direction of the first extrusion wheel is at least greater than or equal to twice the diameter of the solid wires; Thirdly, the minimum dimension of the first covering wheel along the radial direction of the first extrusion wheel is at least greater than or equal to twice the diameter of the solid wires. The first covering wheel is made of rubber material; 5. The delivery assembly of claim 1, wherein, The hardness of the first covering wheel ranges from 70HA to 100HA. The first extrusion wheel at least comprises the following technical features:

6. The delivery assembly of claim 2, wherein, Firstly, the outer diameter of the gear component is greater than the outer diameter of the conveying component; Secondly, the gear component and the conveying component are in an integrated structure; Thirdly, the outer wall of the first covering wheel is coplanar with the outer wall of the conveying component. The second extrusion wheel comprises a second wheel body and a second covering wheel, the second covering wheel is sleeved on at least part of the outer wall of the second wheel body, the second wheel body is in meshing connection with the first wheel body, the outer wall of the second covering wheel has the second arc-shaped groove, and the second covering wheel is made of deformable material; 7. The delivery assembly of any of claims 1 to 6, wherein, The structure of the second wheel body is the same as that of the first wheel body, and the structure of the second covering wheel is the same as that of the first covering wheel. The conveying assembly comprises a support frame, a driving assembly, and the conveying assembly according to any one of claims 1 to 7; 8. An extrusion mechanism characterized by, The driving assembly is arranged on the support frame, the first extrusion wheel and the second extrusion wheel in 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. ​ 9. The extrusion mechanism of claim 8, wherein, The driving assembly comprises a driving member and a driving wheel, the driving member is arranged on the support frame, an output end of the driving member is connected with the driving wheel, the driving wheel is rotatably arranged on the support frame and engaged with the first extruding wheel or the second extruding wheel; And / or, the support frame comprises a first support frame and a second support frame, the first support frame is arranged on the second support frame and encloses a mounting space, the driving wheel, the first extruding wheel and the second extruding wheel are located in the mounting space.

10. A 3D printer characterized by, The machine comprises a rack, a melting mechanism and an extruding mechanism as claimed in claim 8 or 9; The extruding mechanism and the melting mechanism are respectively arranged on the rack, the extruding mechanism is used for pushing the solid wire to the melting mechanism.

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