Extrusion mechanism and 3D printer

Abstract

The utility model relates to an extrusion mechanism and a 3D printer. The extrusion mechanism comprises: a support frame; the driving piece is arranged on the supporting frame; the extrusion assembly comprises a worm, a driving wheel and a driven wheel, the worm is rotatably arranged on the supporting frame and connected with the output end of the driving part, the driving wheel and the driven wheel are rotatably arranged on the supporting frame, and the driving wheel is meshed with the worm and the driven wheel; a conveying channel for containing the solid wires is formed between the driving wheel and the driven wheel in a spaced mode, and the solid wires are driven to move along the conveying channel. The worm is matched with the driving wheel, so that the transmission ratio is large, the rotating torque can be increased, large extrusion force is provided for conveying of the solid wires, and it is guaranteed that the solid wires are rapidly and efficiently extruded. And moreover, the worm and the driving wheel are small in size and light in weight, the size of the extrusion mechanism can be reduced, and lightweight design of the 3D printer is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of 3D printing technology, in particular to 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 and extrude the molten-state consumables. The 3D printer adopts the extrusion mechanism to transport 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 improves the torque and pushes the solid wire through the transmission mechanism. The transmission mechanism usually adopts large gear transmission or planetary gear set. The transmission ratio of the two transmission mechanisms is relatively low, usually between 1:3 and 1:7.5.

[0004] In order to improve the transmission ratio and increase the transmission torque, the size of the transmission gear or the number of gear teeth is usually increased. However, this will increase the overall volume of the transmission mechanism, and further increase the volume of the entire 3D printer, which is not conducive to the lightweight design of the 3D printer. CONTENT OF THE INVENTION

[0005] Therefore, it is necessary to provide an extrusion mechanism and a 3D printer to solve the problems of volume increase caused by increasing the transmission ratio of the extrusion mechanism in the current 3D printer. The extrusion mechanism has a large transmission ratio to increase the rotation torque, and the volume and weight are small, which is conducive to the lightweight design of the 3D printer.

[0006] An extrusion mechanism comprises:

[0007] a support frame;

[0008] a driving member arranged on the support frame; and

[0009] an extrusion assembly comprising a worm, a driving wheel and a driven wheel, the worm being rotatably arranged on the support frame and connected to the output end of the driving member, the driving wheel and the driven wheel being rotatably arranged on the support frame, and the driving wheel being engaged with the worm and the driven wheel, respectively.

[0010] The driving wheel and the driven wheel are spaced apart to form a conveying channel for accommodating the solid wire and drive the solid wire to move along the conveying channel.

[0011] In an embodiment of the present application, the driving wheel is provided with a first circular arc groove, and / or the driven wheel is provided with a second circular arc groove.

[0012] The first circular-arc groove and the driven wheel are spaced apart to form the conveying channel;

[0013] Alternatively, the driving wheel and the second circular-arc groove are spaced apart to form the conveying channel;

[0014] Alternatively, the first circular-arc groove and the second circular-arc groove form the conveying channel.

[0015] The conveying channel has a dimension along a radial direction of the driving wheel that is less than a diameter of the solid wire.

[0016] In an embodiment of the present application, the extruding mechanism further comprises an adjusting assembly, the adjusting assembly is rotatably arranged on the support frame, and the driven wheel is rotatably arranged on the adjusting assembly.

[0017] The adjusting assembly drives the driven wheel to move close to or away from the driving wheel to adjust the extrusion force between the driven wheel and the driving wheel.

[0018] In an embodiment of the present application, the adjusting assembly comprises a mounting member, an elastic member and a fastener, the mounting member is rotatably arranged on the support frame, and the driven wheel is rotatably arranged on the mounting member.

[0019] The fastener penetrates through the mounting member and is connected with the support frame.

[0020] The elastic member elastically connects between the fastener and the mounting member and is located on a side of the mounting member away from the driving wheel.

[0021] In an embodiment of the present application, the mounting member has a mounting hole penetrating through along a radial direction of the driven wheel.

[0022] The driven wheel is rotatably arranged in the mounting hole.

[0023] In an embodiment of the present application, the mounting member further comprises a mounting body, the mounting body is rotatably arranged on the support frame.

[0024] The mounting member further comprises a reinforcing portion arranged on at least one surface of the mounting body, and / or the mounting member further comprises a pulling portion arranged on one end of the mounting body and exposed to the support frame.

[0025] In an embodiment of the present application, the adjusting assembly further comprises a support shaft, the mounting member is rotatably arranged on the support frame through the support shaft.

[0026] In one embodiment of this application, the support frame includes a support housing and a support cover plate, the support housing having a receiving cavity, and the extrusion assembly being located in the receiving cavity;

[0027] The support cover plate is placed over the support housing.

[0028] In one embodiment of this application, the number of worm gears ranges from 1 to 5; and / or the number of teeth on the drive wheel ranges from 15 to 40.

[0029] A 3D printer includes a frame, a melting mechanism, and an extrusion mechanism as described in any of the above technical features;

[0030] The extrusion mechanism and the melting mechanism are respectively disposed on the frame, and the extrusion mechanism is used to push the solid wire to the melting mechanism.

[0031] By adopting the above technical solution, this application has at least the following technical effects:

[0032] The extrusion mechanism and 3D printer disclosed in this application include an extrusion mechanism in which a worm gear is installed at the output end of the drive component. The worm gear meshes with a driving wheel, which in turn meshes with a driven wheel. A conveying channel for accommodating solid filament is formed between the driving wheel and the driven wheel. When the drive component drives the worm gear to rotate, the worm gear drives the driving wheel to rotate through the meshing relationship. The rotation of the driving wheel and the driven wheel generates extrusion and friction forces with the solid filament to push the solid filament.

[0033] This extrusion mechanism uses a worm gear and a drive wheel to transmit power. The worm gear and drive wheel have a large transmission ratio, increasing the rotational torque and providing a large extrusion force for feeding the solid filament, ensuring rapid and efficient extrusion. Furthermore, the worm gear and drive wheel are small in size and lightweight, reducing the overall size of the extrusion mechanism. Simultaneously, the drive wheel directly engages with the driven wheel to push the solid filament, eliminating the need for additional gears and further reducing the size of the extrusion mechanism, which is beneficial for lightweight design of 3D printers. Attached Figure Description

[0034] Figure 1 This is a perspective view of an extrusion mechanism according to an embodiment of this application.

[0035] Figure 2 for Figure 1 The front view of the extrusion mechanism is shown.

[0036] Figure 3 for Figure 1 The diagram shown is an exploded view of the extrusion mechanism.

[0037] Figure 4 for Figure 1 The diagram shows the extrusion mechanism without the support frame.

[0038] Figure 5 Fig. 1 is a perspective view of an extrusion mechanism according to an embodiment of the present application. Figure 1 Fig. 2 is a schematic view showing the driving wheel and the driven wheel clamping the solid wire in the extrusion mechanism shown in Fig. 1.

[0039] Figure 6 Fig. 3 is a top view of the driving wheel and the driven wheel clamping the solid wire shown in Fig. 1. Figure 5 Fig. 4 is a top view of the driving wheel and the driven wheel shown in Fig. 1.

[0040] Figure 7 Fig. 5 is a top view of the driving wheel and the driven wheel shown in Fig. 1. Figure 6 Fig. 6 is a top view of the driving wheel and the driven wheel shown in Fig. 1.

[0041] Figure 8 Fig. 7 is a perspective view of the extrusion mechanism without the support frame shown in Fig. 1. Figure 4 Fig. 8 is a perspective view of the extrusion mechanism without the support frame shown in Fig. 1.

[0042] 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., these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing 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. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in conjunction with the drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0044] 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., these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] It can be understood that the current 3D printer usually uses an extrusion mechanism to push a solid wire. The extrusion mechanism silo increases the torque and pushes the solid wire through a transmission mechanism. The transmission mechanism usually uses a large gear ratio gear adapter or planetary gear set. In order to increase the transmission ratio and increase the transmission torque, the size of the transmission gear or the number of teeth of the large gear ring is usually increased. However, this will increase the overall volume of the transmission mechanism, and thus increase the volume of the entire 3D printer, which is not conducive to the lightweight design of the 3D printer.

[0050] Therefore, referring to Figures 1 to 3 The present application provides a new type of extrusion mechanism 100. Figure 1 The perspective view of the extrusion mechanism 100 of an embodiment of the present application is shown in Figure 2 The front view of the extrusion mechanism 100 is shown in Figure 1 The front view of the extrusion mechanism 100 is shown in Figure 3 The front view of the extrusion mechanism 100 is shown in Figure 1 The exploded view of the extrusion mechanism 100 is shown in

[0051] Moreover, the extrusion mechanism 100 is a component of a 3D printer (not shown), and the extrusion mechanism 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.

[0052] Of course, in other embodiments of the present application, the extrusion mechanism 100 can also be a wire feeding mechanism applied to devices such as textile equipment that need to transport wire. The present application only takes the extrusion mechanism 100 applied to the 3D printer and transporting the solid wire 200 as an example for description.

[0053] In the present application, the solid wire 200 is a printing consumable. Further, the solid wire 200 is taken as an example for description with a fused filament, i.e. a thermoplastic wire. The solid wire 200 can be melted into a molten wire melt after being heated. The extrusion mechanism 100 is used to push the solid wire 200 and provide an extrusion force for the solid wire 200, so that the melting mechanism can extrude the molten wire melt.

[0054] Alternatively, the solid wire 200 is made of ABS (Acrylonitrile Butadiene Styrene), PLA (polylactic acid), PETG (amorphous copolyester, Petgplastics), PET (polyethylene terephthalate), etc.

[0055] The extrusion mechanism 100 has a large transmission ratio, which can increase the rotation torque, and provide a large extrusion force for the conveying of the solid wire 200. Meanwhile, the extrusion mechanism 100 has a small volume and light weight, which is beneficial to the lightweight design of the 3D printer. The specific structure of the extrusion mechanism 100 in an embodiment is described below.

[0056] Referring to Figures 1 to 4 In an embodiment, the extrusion mechanism 100 includes a support frame 110, a driving member 120, and an extrusion assembly 130. The driving member 120 is arranged on the support frame 110. The extrusion assembly 130 includes a worm 131, a driving wheel 132, and a driven wheel 133. The worm 131 is rotatably arranged on the support frame 110 and connected to the output end of the driving member 120. The driving wheel 132 and the driven wheel 133 are rotatably arranged on the support frame 110, and the driving wheel 132 is engaged with the worm 131 and the driven wheel 133, respectively. The driving wheel 132 and the driven wheel 133 are spaced apart to form a conveying channel 134 for accommodating the solid wire 200 and drive the solid wire 200 to move along the conveying channel 134. Figure 4 For Figure 1 A schematic view of the extrusion mechanism 100 without the support frame 110 is shown.

[0057] The support frame 110 is the overall frame of the extrusion mechanism 100, and other components of the extrusion mechanism 100 are arranged on the support frame 110, so that the extrusion mechanism 100 is integrated into a whole structure. After the extrusion mechanism 100 is installed on the rack of the 3D printer, the extrusion mechanism 100 is installed on the rack through the support frame 110, so that the extrusion mechanism 100 is fixed to the 3D printer.

[0058] The driving member 120 is the power source of the extrusion assembly 130, and the extrusion assembly 130 is the component for pushing the solid wire 200. The driving member 120 is fixedly arranged on the support frame 110, and the extrusion assembly 130 is rotatably arranged on the support frame 110. The driving member 120 is in driving connection with the extrusion assembly 130. Optionally, the driving member 120 is a motor.

[0059] The extrusion assembly 130 has a conveying channel 134 therethrough, and the solid wire 200 is located in the conveying channel 134. In this way, when the driving member 120 drives the extrusion assembly 130 to move, the extrusion assembly 130 and the solid wire 200 can generate extrusion force and friction force, and the friction force can drive the solid wire 200 to move in the conveying channel 134, i.e., the extrusion assembly 130 pushes the solid wire 200.

[0060] Referring to Figures 1 to 4Specifically, the extrusion assembly 130 comprises a worm 131, a driving wheel 132 and a driven wheel 133. The worm 131 is rotatably arranged in the height direction on the support frame 110 and is arranged at the output end of the driving member 120. The driving wheel 132 and the driven wheel 133 are arranged in the support frame 110 in the axial direction perpendicular to the worm 131 and are rotatable. Moreover, the worm 131 is engaged with the driving wheel 132, and the driving wheel 132 is engaged with the driven wheel 133.

[0061] In Figure 1 , Figure 2 and Figure 4 , the height direction of the worm 131 is the up-down direction of the entire extrusion mechanism 100, the driving wheel 132 and the driven wheel 133 have a circumferential direction, a radial direction and an axial direction. The circumferential direction is the circumferential direction of the driving wheel 132, the radial direction is the diameter direction of the driving wheel 132, and the axial direction is the rotation axis direction of the driving wheel 132. Hereinafter, the height direction, the circumferential direction, the radial direction and the axial direction will not be described again.

[0062] The driving wheel 132 and the driven wheel 133 are spaced apart to form a conveying channel 134 (as shown in Figure 5 ). The conveying channel 134 penetrates between the driving wheel 132 and the driven wheel 133 in the height direction and is parallel to the worm 131. When the driving member 120 drives the worm 131 to rotate, the worm 131 can drive the driving wheel 132 to rotate through the engagement relationship, and then the driving wheel 132 can drive the driven wheel 133 to rotate through the engagement relationship.

[0063] The solid wire 200 is located behind the conveying channel 134, and the outer surface of the solid wire 200 can abut against the driving wheel 132 and the driven wheel 133. When the driving wheel 132 and the driven wheel 133 rotate, the driving wheel 132 and the driven wheel 133 and the solid wire 200 will generate an extrusion force and a frictional force, which can make the solid wire 200 move in the conveying channel 134. In this way, the solid wire 200 can be moved to the melting mechanism, realizing that the extrusion mechanism 100 pushes the solid wire 200.

[0064] It is worth noting that the extrusion force refers to the pressure applied by the driving wheel 132 and the driven wheel 133 to the solid wire 200, and the extrusion force refers to the force (i.e. the frictional force) by which the driving wheel 132 and the driven wheel 133 push the solid wire 200. It can be understood that the greater the extrusion force applied to the solid wire 200, the greater the frictional force generated between the driving wheel 132 and the driven wheel 133 and the solid wire 200, thereby increasing the extrusion force of the solid wire 200. The distance between the driving wheel 132 and the driven wheel 133 can be adjusted to adjust the extrusion force and the extrusion force.

[0065] Moreover, after the solid wire 200 is melted into the wire melt in the melting mechanism, the flow resistance of the wire melt in the melting mechanism is increased, and the extrusion mechanism 100 can apply an extrusion force to the wire melt in the melting mechanism through the solid wire 200 after the solid wire 200 is pushed by the extrusion mechanism 100, so that the melting mechanism can extrude the wire melt in the melting mechanism.

[0066] It should be noted that the process of pushing the solid wire 200 by the extrusion mechanism 100 and the process of providing the extrusion force will not be described again hereinafter.

[0067] The worm 131 and the driving wheel 132 are used to transmit power, and the worm 131 and the driving wheel 132 have a larger transmission ratio advantage than the transmission gear, which increases the extrusion force. At the same time, the worm and the driving wheel 132 are small in size, which can reduce the volume of the extrusion mechanism 100 while increasing the transmission ratio, which is beneficial to the lightweight design of the 3D printer.

[0068] The extrusion mechanism 100 of the above embodiment uses the worm 131 and the driving wheel 132 to transmit power, and the cooperation of the worm 131 and the driving wheel 132 has a larger transmission ratio, which increases the rotational torque and provides a larger extrusion force for the conveying of the solid wire 200, ensuring that the solid wire 200 is extruded quickly and efficiently. Moreover, the worm 131 and the driving wheel 132 are small in size and light in weight, which can reduce the volume of the extrusion mechanism 100 while ensuring the volume of the extrusion mechanism 100. At the same time, the driving wheel 132 directly cooperates with the driven wheel 133 to push the solid wire 200, without the need to increase additional gears, which further reduces the volume of the extrusion mechanism 100 and is beneficial to the lightweight design of the 3D printer.

[0069] In an embodiment, the number of heads of the worm 131 ranges from 1 to 5. It can be understood that the number of heads of the worm 131 refers to the number of threads of the worm 131, i.e. the worm 131 is composed of several independent threads. The number of heads of the worm 131 in the above range can increase the transmission ratio of the extrusion assembly 130 and improve the extrusion force of the extrusion mechanism 100 to push the solid wire 200. Alternatively, the number of heads of the worm 131 is 2.

[0070] In an embodiment, the number of teeth of the driving wheel 132 ranges from 15 to 40. The number of teeth of the driving wheel 132 refers to the number of protruding parts on the driving wheel 132 for engagement. The number of teeth of the driving wheel 132 in the above range can increase the transmission ratio of the extrusion assembly 130 and improve the extrusion force of the extrusion mechanism 100 to push the solid wire 200. Alternatively, the number of teeth of the driving wheel 132 is 20.

[0071] In an embodiment, the worm 131 has a number of heads ranging from 1 to 5, and the driving wheel 132 has a number of teeth ranging from 15 to 40. The worm 131 and the driving wheel 132 are engaged to transmit power, which can increase the transmission ratio of the extrusion assembly 130, thereby increasing the rotational torque to improve the extrusion force of the extrusion mechanism 100 to push the solid wire 200. At the same time, the worm 131 and the driving wheel 132 do not need to be equipped with a transmission gear, which reduces the weight of the extrusion mechanism 100.

[0072] In the embodiment, the worm 131 has 2 heads, and the driving wheel 132 has 20 teeth. In this way, the transmission ratio of the worm 131 and the driving wheel 132 of the present application is 10:1, and the transmission ratio of the worm gear and the driving wheel 132 is larger.

[0073] Taking a large-tooth gear as an example, the number of teeth of the two gears of the large-tooth gear is 10 (the minimum value allowed by the process) and 70 (the maximum value allowed by the process), respectively, and the transmission ratio of the two gears is 7:1. Compared with the cooperation structure of the worm 131 and the driving wheel 132 of the present application, the maximum transmission ratio of the large-tooth gear cannot reach the transmission ratio of the worm 131 and the driving wheel 132 of the present application.

[0074] Moreover, for the large-tooth gear, two-stage transmission is usually required, which is distributed according to the two-stage transmission ratio of 5:1 and 2:1, that is, two groups of gears are required for the large-tooth gear. The cooperation of the worm 131 and the driving wheel 132 of the present application can achieve the transmission of motion. Compared with the large-tooth gear, the cooperation of the worm gear and the driving wheel 132 of the present application has the characteristics of light weight, simple structure, and high reliability.

[0075] The extrusion mechanism 100 of the present application uses the transmission power of the worm gear and the driving wheel 132 in the extrusion assembly 130, which can increase the transmission ratio of the extrusion assembly 130, thereby increasing the extrusion force of the driving wheel 132 and the driven wheel 133 to push the solid wire 200. At the same time, no additional gear transmission is required between the worm gear and the driving wheel 132, which simplifies the transmission path of the motion, reduces the volume and weight of the extrusion mechanism 100, reduces the complexity of the structure, and ensures the overall reliability.

[0076] Moreover, the driving wheel 132 not only provides power but also engages with the driven wheel 133 to serve as an extrusion wheel. When the driving wheel 132 drives the driven wheel 133 to rotate, it can directly convey the solid wire 200 without additional gear transmission, thereby reducing the complexity of the structure.

[0077] Referring to Figure 1 and Figure 5In one embodiment of this application, the outer wall of the driving wheel 132 has an annular first arc groove 1321, and the outer wall of the driven wheel 133 has an annular second arc groove 1331. The first arc groove 1321 and the second arc groove 1331 form a conveying channel 134. Figure 5 for Figure 1 The diagram shows the driving wheel 132 and driven wheel 133 clamping the solid wire 200 in the extrusion mechanism 100.

[0078] The outer wall of the driving wheel 132 has a recessed first arcuate groove 1321, which is arranged in a ring around the periphery of the driving wheel 132, and the cross-sectional shape of the first arcuate groove 1321 is arcuate. The outer wall of the driven wheel 133 has a recessed second arcuate groove 1331, which is arranged in a ring around the periphery of the driven wheel 133, and the cross-sectional shape of the second arcuate groove 1331 is arcuate.

[0079] Furthermore, the first arcuate groove 1321 of the driving wheel 132 and the second arcuate groove 1331 of the driven wheel 133 are arranged opposite to each other, and the first arcuate groove 1321 and the second arcuate groove 1331 are connected and form a conveying channel 134. The solid wire 200 is located after the conveying channel 134, with part of the solid wire 200 located in the first arcuate groove 1321 and part of the solid wire 200 located in the second arcuate groove 1331.

[0080] When the worm gear 131 drives the drive wheel 132 to rotate, the drive wheel 132 can drive the driven wheel 133 to rotate. The drive wheel 132 and the driven wheel 133 can generate extrusion force and friction force on the solid wire 200 in the first arc groove 1321 and the second arc groove 1331, so as to drive the solid wire 200 to move in the conveying channel 134.

[0081] See Figure 6 In one embodiment, the dimension of the conveying channel 134 along the radial direction of the drive wheel 132 is smaller than the diameter of the solid wire 200. Figure 6 for Figure 5 The top view shown depicts the driving wheel 132 and driven wheel 133 clamping the solid wire 200. Figure 7 for Figure 6 The top view of the driving wheel 132 and the driven wheel 133 shown.

[0082] In other words, the distance between the inner wall of the first arc groove 1321 and the inner wall of the second arc groove 1331 is 'a', which is the width dimension 'a' of the conveying channel 134. This width is smaller than the diameter of the solid wire 200. The conveying channel 134 is approximately elliptical in shape. Figure 5 and Figure 6The solid wire 200 is installed into the conveying channel 134 in an interference fit. The solid wire 200 is in an interference fit with the conveying channel 134 after the solid wire 200 is installed into the conveying channel 134.

[0083] In this way, the driving wheel 132 and the driven wheel 133 can squeeze the solid wire 200. When the driving wheel 132 and the driven wheel 133 rotate, the driving wheel 132 can drive the driven wheel 133 to rotate, and the driving wheel 132 and the driven wheel 133 can generate squeezing force and friction force on the solid wire 200 in the first circular-arc groove 1321 and the second circular-arc groove 1331, so as to drive the solid wire 200 to move in the conveying channel 134.

[0084] In an embodiment, the first circular-arc groove 1321 and the second circular-arc groove 1331 have the same radius. In this way, after the solid wire 200 is located in the conveying channel 134, the squeezing force and the friction force generated by the driving wheel 132 and the driven wheel 133 on the solid wire 200 are approximately the same, which ensures that the solid wire 200 can be accurately conveyed into the melting mechanism and avoids deviation of the solid wire 200 from the central axis of the melting mechanism.

[0085] In another embodiment of the present application, only the first circular-arc groove 1321 can be arranged on the outer wall of the driving wheel 132. At this time, the conveying channel 134 is formed between the first circular-arc groove 1321 and the driven wheel 133, and the solid wire 200 is installed in the conveying channel 134 in an interference fit.

[0086] In still another embodiment of the present application, only the second circular-arc groove 1331 can be arranged on the outer wall of the driven wheel 133. At this time, the conveying channel 134 is formed between the second circular-arc groove 1331 and the driving wheel 132, and the solid wire 200 is installed in the conveying channel 134 in an interference fit.

[0087] Referring to Figures 1 to 3 In an embodiment, the support frame 110 includes a support housing 111 and a support cover plate 112. The support housing 111 has a receiving cavity (not shown) in which the extrusion assembly 130 is located, and the support cover plate 112 is arranged on the support housing 111.

[0088] The support housing 111 is a main structure for bearing the extrusion assembly 130. The support housing 111 is hollow, and the hollow cavity is a receiving cavity. The worm 131 is rotatably arranged in the support housing 111 along the height direction and located in the receiving cavity. The driving wheel 132 and the driven wheel 133 are rotatably arranged in the support housing 111 and located in the receiving cavity.

[0089] The support cover plate 112 is arranged on the rear of the support shell 111, and the support cover plate 112 can be arranged on the accommodating cavity. In this way, the support cover plate 112 can at least partially shield the worm 131, the driving wheel 132 and the driven wheel 133, so as to play a protection role and avoid foreign matters from entering between the extrusion assembly 130 to affect the transmission of the worm 131, the driving wheel 132 and the driven wheel 133.

[0090] Optionally, the support shell 111 has an avoiding groove 1111 which is recessed on the surface of the support shell 111 facing the support cover plate 112, and the avoiding groove 1111 can avoid the driven wheel 133 to avoid interference between the driven wheel 133 and the support shell 111. Optionally, the support cover plate 112 is fixed to the support shell 111 by a fixing member such as a screw.

[0091] Referring to Figure 1 、 Figure 3 、 Figure 4 and Figure 8 , in an embodiment, the extrusion mechanism 100 further comprises an adjusting assembly 140 which is rotatably arranged on the support frame 110, and the driven wheel 133 is rotatably arranged on the adjusting assembly 140. The adjusting assembly 140 drives the driven wheel 133 to approach or move away from the driving wheel 132 to adjust the extrusion force between the driven wheel 133 and the driving wheel 132. Figure 8 As shown in Figure 4 , it is a perspective view of the extrusion mechanism 100 without the support frame 110.

[0092] The adjusting assembly 140 is rotatably arranged in the support shell 111 of the support frame 110, and the driven wheel 133 is rotatably arranged on the adjusting assembly 140. That is, the driven wheel 133 is indirectly arranged on the support shell 111 through the adjusting assembly 140, and when the adjusting assembly 140 rotates relative to the support shell 111, it can drive the driven wheel 133 to approach or move away from the driving wheel 132.

[0093] When the driving wheel 132 and the driven wheel 133 can continuously push the solid wire 200, the adjusting assembly 140 can drive the driven wheel 133 to approach the driving wheel 132 to reduce the width dimension a of the conveying channel 134. In this way, the extrusion force exerted by the driven wheel 133 on the solid wire 200 can be increased, the friction between the solid wire 200 and the first circular arc groove 1321 and the second circular arc groove 1331 can be increased, and it is ensured that the solid wire 200 can be normally extruded.

[0094] If the solid wire 200 is blocked in the melting mechanism, the extrusion force and friction force generated by the driving wheel 132 and the driven wheel 133 on the solid wire 200 cannot push the solid wire 200, even if the extrusion force and the friction force are large. At this time, the driving wheel 132 reciprocally extrudes the solid wire 200, and then pushes the driven wheel 133 to move through the solid wire 200. The driven wheel 133 can overcome the force of the adjusting assembly 140, so that the adjusting assembly 140 rotates relative to the support frame 110, and then the driven wheel 133 can move away from the driving wheel 132.

[0095] After the driven wheel 133 moves away from the driving wheel 132, the driven wheel 133 can disengage from the driving wheel 132. At this time, the solid wire 200 is located between the driving wheel 132 and the driven wheel 133, and the driving wheel 132 does not extrude the solid wire 200. If the adjusting assembly 140 is not provided, the driving wheel 132 and the driven wheel 133 will always push the solid wire 200 downward, but the solid wire 200 cannot move due to the blockage of the melting mechanism, which will increase the load of the driving member 120, causing the driving member 120 to be damaged by overloading.

[0096] The extrusion mechanism 100 of the present application is provided with the rotatable adjusting assembly 140 in the support frame 110, and the driven wheel 133 is rotatably arranged in the support frame 110. The adjusting assembly 140 can move the driven wheel 133 close to the driving wheel 132, so that the driven wheel 133 cooperates with the driving wheel 132 to extrude the solid wire 200, increase the extrusion force and the friction force between the solid wire 200 and the first circular-arc groove 1321 and the second circular-arc groove 1331, and ensure that the solid wire 200 can be normally extruded. When the required extrusion force of the solid wire 200 is too large, the adjusting assembly 140 can move the driven wheel 133 away from the solid wire 200, so as to protect the driving member 120 from being damaged by overloading.

[0097] Referring to Figure 1 , Figure 3 , Figure 4 and Figure 8 , in an embodiment, the adjusting assembly 140 includes a mounting member 141, an elastic member 142, and a fastening member 143. The mounting member 141 is rotatably arranged in the support frame 110, and the driven wheel 133 is rotatably arranged in the mounting member 141. The fastening member 143 penetrates the mounting member 141 and is connected with the support frame 110. The elastic member 142 is elastically connected between the fastening member 143 and the mounting member 141, and is located on the side of the mounting member 141 away from the driving wheel 132.

[0098] The bottom of the mounting member 141 is rotatably mounted on the support housing 111, and the middle of the mounting member 141 is rotatably mounted on the driven wheel 133. One end of the fastener 143 is fixed to the support housing 111 through the top of the mounting member 141, and the mounting member 141 is movable along the fastener 143. The elastic member 142 elastically connects the fastener 143 and the mounting member 141.

[0099] When the extrusion mechanism 100 normally pushes the solid wire 200, the elastic force of the elastic member 142 can push the mounting member 141, so that the mounting member 141 drives the driven wheel 133 to move towards the driving wheel 132, so that the driven wheel 133 cooperates with the driving wheel 132 to apply pressure to the solid wire 200, and increase the extrusion force and friction force between the solid wire 200 and the first circular-arc groove 1321 and the second circular-arc groove 1331.

[0100] When the required extrusion force of the solid wire 200 is too large (the solid wire 200 is blocked in the melting mechanism), the driving wheel 132 applies pressure to the driven wheel 133, so that the driven wheel 133 drives the mounting member 141 to move away from the driving wheel 132 against the elastic force of the elastic member 142, so as to protect the driving member 120 from overloading damage.

[0101] Optionally, the fastener 143 is a screw or a bolt. Optionally, the elastic member 142 is a compression spring or a bellows.

[0102] Referring to Figure 1 and Figure 8 In an embodiment, the mounting member 141 has a mounting hole 1411 extending through the mounting member 141 along the radial direction of the driven wheel 133, and the driven wheel 133 is rotatably arranged in the mounting hole 1411. That is, the mounting member 141 has the mounting hole 1411 extending through the mounting body 1412 along the radial direction. In this way, the driven wheel 133 is rotatably arranged in the mounting hole 1411, so as to facilitate the rotational installation of the driven wheel 133.

[0103] In an embodiment, the adjusting assembly 140 further comprises a support shaft 144, and the mounting member 141 is rotatably arranged on the support frame 110 through the support shaft 144. The support shaft 144 extends along the axial direction of the driven wheel 133, the support shaft 144 is fixed to the support frame 110, the bottom of the mounting member 141 is rotatably arranged on the support shaft 144, and the top of the mounting member 141 is connected to the fastener 143. In this way, when the support frame 110 is driven by the driven wheel 133 to move away from the driving wheel 132, the support frame 110 can rotate around the support shaft 144.

[0104] Referring to Figure 1 and Figure 8In an embodiment, the mounting member 141 further comprises a mounting body 1412 rotatably arranged on the support frame 110. The mounting body 1412 is a driving component for supporting the driving wheel 132. The bottom of the mounting body 1412 is rotatably arranged on the support housing 111 through a support shaft 144. The fastener 143 is movably arranged on the top of the mounting body 1412. The driven wheel 133 is rotatably arranged on the middle of the mounting body 1412. Optionally, the mounting body 1412 is arranged in a plate shape.

[0105] Referring to Figure 1 and Figure 8 In an embodiment, the mounting member 141 further comprises a reinforcing portion 1413 arranged on at least one surface of the mounting body 1412. The reinforcing portion 1413 is arranged on the mounting body 1412, which can enhance the structural strength of the mounting member 141, so that the mounting member 141 can reliably support the driven wheel 133.

[0106] Optionally, the reinforcing portion 1413 is in a column shape and arranged on both sides of the mounting body 1412 in the axial direction of the driven wheel 133. Optionally, the reinforcing portion 1413 is arranged on both sides of the mounting body 1412.

[0107] Referring to Figure 1 and Figure 8 In an embodiment, the mounting member 141 further comprises a pulling portion 1414 arranged on one end of the mounting body 1412 and exposed to the support frame 110. The pulling portion 1414 is arranged on the top of the mounting body 1412 and exposed to the outside of the support frame 110.

[0108] When the solid wire 200 needs to be loaded into the conveying channel 134, the operator operates the pulling portion 1414 to drive the mounting body 1412 to overcome the elastic force of the elastic member 142, so that the driven wheel 133 moves away from the driving wheel 132, facilitating the installation of the solid wire 200. Optionally, the pulling portion 1414 is an arc-shaped plate or other structure that is convenient to operate.

[0109] When the solid wire 200 is pushed by the extrusion mechanism 100, the driving member 120 is energized to move, driving the worm 131 to rotate. The worm 131 is in meshing connection with the driving wheel 132 and drives the driving wheel 132 to rotate. The driving wheel 132 is in meshing connection with the driven wheel 133 and drives the driven wheel 133 to rotate.

[0110] After the solid wire 200 is inserted into the conveying channel 134, the solid wire 200 abuts against the inner wall of the first circular-arc groove 1321 and the inner wall of the second circular-arc groove 1331, respectively. Under the action of the adjusting assembly 140, the driving wheel 132 and the driven wheel 133 generate extrusion force on the solid wire 200. With the rotation of the driving wheel 132 and the driven wheel 133, friction force is generated between the driving wheel 132, the driven wheel 133 and the solid wire 200, and under the action of the friction force, the solid wire 200 moves along the conveying channel 134, thereby realizing the conveying of the solid wire 200.

[0111] The extrusion mechanism 100 of the present application uses the structure of the worm 131 and the driving wheel 132 to improve the transmission ratio, and under the premise of ensuring the space volume of the extrusion mechanism 100, a larger extrusion force can be output, thereby ensuring the fast and efficient extrusion of the solid wire 200.

[0112] The present application also provides a 3D printer, which comprises a rack, a melting mechanism and the extrusion mechanism 100 according to any one of the above embodiments. The extrusion mechanism 100 and the melting mechanism are arranged on the rack, and the extrusion mechanism 100 is used to push the solid wire 200 to the melting mechanism.

[0113] The 3D printer of the present application uses the extrusion mechanism 100 of the above embodiments, which can improve the transmission ratio and output a larger extrusion force under the premise of ensuring the space volume of the extrusion mechanism 100, thereby ensuring the fast and efficient extrusion of the solid wire 200.

[0114] 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 present application.

[0115] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An extrusion mechanism characterized by, The extrusion mechanism comprises: a support frame; a driving member arranged on the support frame; and an extrusion assembly comprising a worm, a driving wheel and a driven wheel, the worm is rotatably arranged on the support frame and connected to an output end of the driving member, the driving wheel and the driven wheel are rotatably arranged on the support frame, and the driving wheel is respectively engaged with the worm and the driven wheel; wherein the driving wheel and the driven wheel are spaced apart to form a conveying channel for accommodating a solid wire, and the solid wire is driven to move along the conveying channel. The driving wheel is provided with a first circular arc groove, and / or the driven wheel is provided with a second circular arc groove; 2. The extrusion mechanism of claim 1, wherein, the first circular arc groove and the driven wheel are spaced apart to form the conveying channel; alternatively, the driving wheel and the second circular arc groove are spaced apart to form the conveying channel; alternatively, the first circular arc groove and the second circular arc groove form the conveying channel; wherein the conveying channel has a radial dimension along the driving wheel which is smaller than the diameter of the solid wire. The extrusion mechanism further comprises an adjusting assembly, the adjusting assembly is rotatably arranged on the support frame, and the driven wheel is rotatably arranged on the adjusting assembly; 3. The extrusion mechanism of claim 1, wherein, the adjusting assembly drives the driven wheel to move closer to or away from the driving wheel to adjust the extrusion force between the driven wheel and the driving wheel. The adjusting assembly comprises a mounting member, an elastic member and a fastener, the mounting member is rotatably arranged on the support frame, and the driven wheel is rotatably arranged on the mounting member; 4. The extrusion mechanism of claim 3, wherein, the fastener passes through the mounting member and is connected to the support frame; the elastic member elastically connects between the fastener and the mounting member, and is located on a side of the mounting member away from the driving wheel. The mounting member has a mounting hole penetrating along the radial direction of the driven wheel; 5. The extrusion mechanism of claim 4, wherein, the driven wheel is rotatably arranged in the mounting hole. The mounting member further comprises a mounting body, the mounting body is rotatably arranged on the support frame; 6. The extrusion mechanism of claim 5, wherein, the mounting member further comprises a reinforcing portion arranged on at least one surface of the mounting body; and / or the mounting member further comprises a pulling portion arranged on one end of the mounting body and exposed to the support frame. The adjusting assembly further comprises a support shaft, the mounting member is rotatably arranged on the support frame through the support shaft.

7. The extrusion mechanism of claim 4, wherein, The support frame comprises a support shell and a support cover plate, the support shell has an accommodating cavity, and the extrusion assembly is arranged in the accommodating cavity; 8. The extrusion mechanism according to any one of claims 1 to 7, characterized in that the support cover plate is arranged on the support shell. The number of the worm ranges from 1 to 5; and / or the number of teeth of the driving wheel ranges from 15 to 40.

9. The extrusion mechanism according to any one of claims 1 to 7, characterized in that The extrusion mechanism comprises a rack, a melting mechanism and the extrusion mechanism according to any one of claims 1 to 9; 10. A 3D printer characterized by, the extrusion mechanism and the melting mechanism are respectively arranged on the rack, and the extrusion mechanism is used for pushing the solid wire to the melting mechanism. ​

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