Extrusion assembly, spray head unit applying same and 3D printing equipment

Abstract

The embodiment of the utility model provides an extrusion assembly, a spray head unit applying the extrusion assembly and 3D printing equipment. The extrusion assembly comprises a driving wheel shaft, a driving extrusion wheel, a speed reduction bevel gear, a driving assembly, a driven extrusion wheel and a driven bevel gear. The driving extrusion wheel is connected to the driving wheel shaft in a sleeving mode. The speed reduction bevel gear is connected to the driving wheel shaft in a sleeving mode. The drive assembly includes a drive helical gear configured to mesh with the deceleration helical gear. The driving extrusion wheel is connected with the driving wheel shaft and is spaced from the speed reduction bevel wheel. The driven bevel gear and the driving bevel gear are arranged at an interval, and the driven bevel gear is configured to be meshed with the speed reduction bevel gear.

Description

Technical Field

[0001] The present application relates to the field of 3D printing, and in particular to an extrusion assembly, a nozzle unit using the same, and a 3D printing device. Background Art

[0002] 3D printing technology is a rapid prototyping technology that uses a digital model file as a basis and applies special wax materials, powdered metals, plastics, or other bondable materials to manufacture three-dimensional objects by printing layer upon layer of materials. Fused deposition modeling technology is one of the main 3D printing technologies. This technology melts a hot melt filament and extrudes it from a nozzle, depositing it on a forming platform or the previously cured material of the previous layer to finally generate a physical object.

[0003] Extruding the consumable is a very crucial step in the 3D printing process. If the extrusion mechanism has unstable clamping of the consumable, it will directly lead to unstable transmission of the consumable and unstable printing, and further result in poor printing effects or even failure. How to provide an extrusion mechanism with stable and reliable consumable delivery and a 3D printing device using the same is what those skilled in the art need to consider. Summary of the Utility Model

[0004] To solve the problems in the prior art, the embodiments of the present application provide an extrusion assembly, a nozzle unit using the same, and a 3D printing device.

[0005] An extrusion assembly according to an embodiment of the present application includes a driving wheel shaft, a driving extrusion wheel, a reduction bevel gear, a driving assembly, a driven extrusion wheel, and a driven bevel gear. The driving extrusion wheel is sleeved and connected to the driving wheel shaft. The reduction bevel gear is sleeved and connected to the driving wheel shaft, and the reduction bevel gear and the driving extrusion wheel are arranged at intervals along the axial direction of the driving wheel shaft. The driving assembly includes a driving bevel gear, and the driving bevel gear is configured to mesh with the reduction bevel gear. The driven bevel gear is arranged at intervals from the driving bevel gear, and the driven bevel gear is configured to mesh with the reduction bevel gear.

[0006] In one embodiment, the extrusion assembly has a transmission channel for transmitting the consumable, and the extrusion assembly further includes a driven extrusion wheel. The driven extrusion wheel meshes with the driving extrusion wheel, and the driven extrusion wheel and the driving extrusion wheel are used for extruding the consumable. The driving extrusion wheel and the driven extrusion wheel are respectively located on opposite sides of the transmission channel, the rotation axis of the driving bevel gear is located on one side of the transmission channel, and the rotation axis of the driven bevel gear is located on the other side of the transmission channel.

[0007] In one embodiment, there are two driven helical gears, including a first driven helical gear and a second driven helical gear. The driving helical gear, the first driven helical gear, and the second driven helical gear are arranged at intervals. Both the first driven helical gear and the second driven helical gear are configured to mesh with the reduction helical gear.

[0008] In one embodiment, the first driven helical gear has a first center point, the second driven helical gear has a second center point, the driving helical gear has a third center point, and the driving wheel shaft has a fourth center point. The first center point, the second center point, and the third center point are sequentially connected to form an acute triangle area, and the fourth center point is located inside the acute triangle area.

[0009] In one embodiment, the extrusion assembly further includes a first bracket and a second bracket. The second bracket is connected to the first bracket, and the second bracket and the first bracket enclose an accommodation space. The reduction helical gear, the driving extrusion wheel, the driven extrusion wheel, the driving helical gear, and the driven helical gears are all arranged in the accommodation space.

[0010] In one embodiment, the first bracket includes a first main body portion, a first side wall, a second side wall, a third side wall, and a fourth side wall. The first side wall, the second side wall, the third side wall, and the fourth side wall are sequentially connected to the edge of the first main body portion. The first side wall, the second side wall, the third side wall, the fourth side wall, and the first main body portion enclose a first installation groove. The reduction helical gear is arranged in the first installation groove. One end of the fourth side wall, the third side wall, and a part of the outer peripheral surface of the reduction helical gear jointly define a first installation space, and the driving helical gear is arranged in the first installation space. The other end of the fourth side wall, the first side wall, and another part of the outer peripheral surface of the reduction helical gear jointly define a second installation space, and the driven helical gear is arranged in the second installation space.

[0011] In one embodiment, the first bracket includes a first main body portion, a first pin, and a support portion. The first pin and the support portion are arranged on opposite sides of the first main body portion. The first main body portion is further provided with an avoidance hole. The driving assembly further includes a driving motor. The driving motor is arranged on the support portion. The driven helical gear is sleeved and connected to the first pin. The driving shaft of the driving motor is configured to pass through the avoidance hole and extend to the side of the first main body portion facing the second bracket. The driving helical gear is sleeved and connected to the part of the driving shaft extending outside the first main body portion.

[0012] In one embodiment, the driving helical gear and the driven helical gears are configured as helical gear structures with the same shape.

[0013] In one embodiment, the reduction bevel gear and the driving extrusion wheel are arranged at an axial interval along the driving wheel shaft.

[0014] The embodiment of the present application further provides a nozzle unit, which includes a nozzle assembly and an extrusion assembly as described in any one of the foregoing embodiments, and the nozzle assembly is connected to the extrusion assembly.

[0015] The embodiment of the present application further provides a 3D printing device, which includes a forming platform, a driving assembly, and an extrusion assembly as described in any one of the foregoing embodiments or the foregoing nozzle unit, and the driving assembly drives the nozzle unit to move relative to the forming platform.

[0016] It can be understood that the driving bevel gear is used to drive the reduction bevel gear to rotate, and the reduction bevel gear drives the driving extrusion wheel to rotate to further extrude the consumable material. Limited by the assembly relationship among the reduction bevel gear, the driving wheel shaft, and the driving extrusion wheel, there is a possibility that the driving extrusion wheel has radial runout along the driving wheel shaft during the process of power transmission from the driving bevel gear to the driving extrusion wheel. By meshing the driven bevel gear with the reduction bevel gear, the driven bevel gear can play a limiting role on the reduction bevel gear, reduce the radial runout displacement of the reduction bevel gear under the action of the driving bevel gear, and further reduce the radial runout displacement of the driving extrusion wheel, improve the rotational stability of the driving extrusion wheel, and then improve the stability of the extrusion assembly for extruding the consumable material, improve the stability of the consumable material conveying, and improve the printing quality. At the same time, the reduction bevel gear, the driving bevel gear, and the driven bevel gear are all in a bevel gear structure meshing, which can reduce the vibration noise generated during the gear meshing process, improve the transmission smoothness between the gears, further improve the rotational stability of the driving extrusion wheel, and improve the conveying stability of the consumable material. Description of the Drawings

[0017] Figure 1 It is a three-dimensional schematic diagram of the extrusion assembly provided by the embodiment of the present application.

[0018] Figure 2 is Figure 1 A cross-sectional schematic diagram along the I-I direction.

[0019] Figure 3 is Figure 1 A cross-sectional schematic diagram along the II-II direction.

[0020] Figure 4 It is a partial three-dimensional schematic diagram of the extrusion assembly provided by the embodiment of the present application.

[0021] Figure 5 It is a partial three-dimensional schematic diagram of another angle of the extrusion assembly provided by the embodiment of the present application.

[0022] Figure 6This is a partial three-dimensional exploded view of the extrusion assembly provided by the embodiments of the present application.

[0023] Figure 7 This is a front view of the extrusion assembly provided by the embodiments of the present application.

[0024] Figure 8 This is a front view of the extrusion assembly provided by another embodiment of the present application.

[0025] Figure 9 This is a three-dimensional schematic diagram of the nozzle unit provided by the embodiments of the present application.

[0026] Figure 10 This is a three-dimensional schematic diagram of the 3D printing device provided by the embodiments of the present application.

[0027] Description of main element symbols:

[0028]

[0029]

[0030] Detailed implementation manners

[0031] The following description will refer to the accompanying drawings to more comprehensively describe the content of the present application. The exemplary embodiments of the present application are shown in the accompanying drawings. However, the present application can be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals denote the same or similar components. The terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms as well. Further, when used herein, "comprises" and / or "comprising" and / or "has", integers, steps, operations, components and / or components, but do not exclude the presence or addition of one or more other features, regions, integers, steps, operations, components and / or their groups. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. Further, terms such as those defined in a general dictionary should be interpreted as having a meaning consistent with their meaning in the relevant art and the content of the present application, and will not be interpreted as idealized or overly formal meanings.

[0032] Generally, 3D printing technology is a rapid prototyping technology that is based on digital model files and uses special wax materials, powdered metals, plastics, and other bondable materials to manufacture three-dimensional objects by printing layer upon layer of materials. Fused deposition modeling (FDM) is one of the main 3D printing technologies. In this technology, a hot-melt filament is heated and melted and then extruded from a nozzle, deposited on a forming platform or the previously cured material of the previous layer, and finally a physical object is generated. Extruding the consumable is a very crucial step in the 3D printing process. If the clamping of the consumable by the extrusion mechanism is unstable, it will directly lead to unstable transmission of the consumable and unstable printing, and further result in poor printing quality or even failure. How to provide an extrusion mechanism with stable and reliable consumable delivery and a 3D printing device using the same is something that those skilled in the art need to consider.

[0033] Correspondingly, the embodiment of the present application provides an extrusion assembly, a nozzle unit using the same, and a 3D printing device. The extrusion assembly includes a driving wheel shaft, a driving extrusion wheel, a reduction bevel gear, a driving component, a driven extrusion wheel, and a driven bevel gear. The driving extrusion wheel is sleeved and connected to the driving wheel shaft. The reduction bevel gear is sleeved and connected to the driving wheel shaft. The driving component includes a driving bevel gear, which is configured to mesh with the reduction bevel gear. The driving extrusion wheel is connected to the driving wheel shaft and is spaced apart from the reduction bevel gear. The driven bevel gear is spaced apart from the driving bevel gear and is configured to mesh with the reduction bevel gear.

[0034] Furthermore, the driving bevel gear is used to drive the reduction bevel gear to rotate, the reduction bevel gear drives the driving wheel shaft to rotate, and the driving wheel shaft drives the driving extrusion wheel to rotate to further extrude the consumable. Limited by the assembly relationship among the reduction bevel gear, the driving wheel shaft, and the driving extrusion wheel, there is a possibility of relative axial movement along the radial direction of the driving wheel shaft between the driving extrusion wheel and the reduction bevel gear during the power transmission from the driving bevel gear to the driving extrusion wheel. By additionally providing a driven bevel gear to mesh with the reduction bevel gear, the driven bevel gear can play a limiting role on the reduction bevel gear, reduce the radial movement displacement between the reduction bevel gear and the driving extrusion wheel, and reduce the frequency of radial movement between the reduction bevel gear and the driving extrusion wheel, so that the relative position of the driving extrusion wheel and the reduction bevel gear along the radial direction can be maintained stable for a long time, thereby improving the rotational stability of the driving extrusion wheel, further improving the stability of the extrusion assembly in extruding the consumable, improving the stability of consumable delivery, and improving the printing quality. At the same time, the reduction bevel gear, the driving bevel gear, and the driven bevel gear are all in a meshing structure of bevel gears, which can reduce the vibration noise generated during gear meshing, improve the transmission smoothness between gears, and further improve the rotational stability of the driving extrusion wheel and the stability of consumable delivery.

[0035] Those skilled in the art can understand that "3D printing" refers to a technology that constructs an object by layer-by-layer printing using bondable materials such as powdered metal or plastic based on a digital model file.

[0036] The following content will describe exemplary embodiments in conjunction with the accompanying drawings. It should be noted that the components depicted in the reference drawings are not necessarily shown to scale; identical or similar components will be given the same or similar reference numerals or similar technical terms.

[0037] The following will refer to the accompanying drawings to further describe in detail the specific implementation manners of the present application.

[0038] As Figures 1 to 8 shown, an extrusion assembly 10 in an embodiment of the present application has a transmission channel 100 for transmitting consumables. The extrusion assembly 10 includes a driving wheel shaft 11, a driving extrusion wheel 141, a reduction bevel gear 12, a driving assembly 13, a driven extrusion wheel 142, and a driven bevel gear 15. The driving extrusion wheel 141 is sleeved and connected to the driving wheel shaft 11, and the driving extrusion wheel 141 is fixedly connected to the driving wheel shaft 11. The reduction bevel gear 12 is sleeved and connected to the driving wheel shaft 11, and the reduction bevel gear 12 is fixedly connected to the driving wheel shaft 11. The reduction bevel gear 12 and the driving extrusion wheel 141 are arranged at an interval along the axial direction of the driving wheel shaft 11. The driving assembly 13 includes a driving bevel gear 131 configured to mesh with the reduction bevel gear 12. The driven extrusion wheel 142 meshes with the driving extrusion wheel 141, and the driven extrusion wheel 142 and the driving extrusion wheel 141 are respectively located on opposite sides of the transmission channel 100, and the driven extrusion wheel 142 and the driving extrusion wheel 141 are configured to rotate towards each other to convey the consumables in the transmission channel 100. The driven bevel gear 15 is arranged at an interval from the driving bevel gear 131, and the driven bevel gear 15 is configured to mesh with the reduction bevel gear 12.

[0039] It can be understood that by additionally providing a driven helical gear 15 meshing with the reduction helical gear 12, the driven helical gear 15 can limit the reduction helical gear 12, reduce the radial runout displacement between the reduction helical gear 12 and the driving extrusion wheel 141, and reduce the frequency of radial runout between the reduction helical gear 12 and the driving extrusion wheel 141, so that the relative position of the driving extrusion wheel 141 and the reduction helical gear 12 along the radial direction can be maintained stable for a long time, thereby improving the rotational stability of the driving extrusion wheel 141, significantly reducing the distance change between the driving extrusion wheel 141 and the driven extrusion wheel 142, further improving the stability of the extrusion assembly 10 for extruding consumables, improving the stability of consumable conveying, and improving the printing quality. At the same time, the reduction helical gear 12, the driving helical gear 131 and the driven helical gear 15 are all meshed in a helical gear structure, which can reduce the vibration noise generated during gear meshing and improve the transmission smoothness between gears, so as to further improve the rotational stability of the driving extrusion wheel 141 and improve the stability of consumable conveying.

[0040] In one embodiment, the driving helical gear 131 and the driven helical gear 15 are configured as helical gear structures with the same shape. In this way, it is convenient to improve the assembly convenience of the driving helical gear 131 and the driven helical gear 15 with the reduction helical gear 12.

[0041] In one embodiment, the helix angles of the driving helical gear 131, the driven helical gear 15 and the reduction helical gear 12 are all equal, and the range of the helix angle is between 15 degrees and 30 degrees. For example, the helix angle can be set to any one of 15 degrees, 16 degrees, 17 degrees, 18 degrees, 19 degrees, 20 degrees, 21 degrees, 22 degrees, 23 degrees, 24 degrees, 25 degrees, 26 degrees, 27 degrees, 28 degrees, 29 degrees, 30 degrees. If the helix angle is too large, during the meshing transmission process of the driving helical gear 131, the driven helical gear 15 and the reduction helical gear 12, the influence on the acting force on the driving wheel shaft 11 is relatively large, and it is easy to reduce the transmission efficiency, and the strength requirement for the driving wheel shaft 11 is higher. If the helix angle is too small, the degree of transmission stability improved by the helical gear structure is not high.

[0042] In this embodiment, by limiting the range of the helix angle, the transmission efficiency of the driving helical gear 131 and the reduction helical gear 12 can be ensured and the transmission stability can be improved at the same time.

[0043] In one embodiment, the extrusion assembly 10 further includes a first bracket 16 and a second bracket 17. The first bracket 16 is connected to the second bracket 17, and the second bracket 17 and the first bracket 16 enclose an accommodation space 18. The reduction helical gear 12, the driving extrusion wheel 141, the driven extrusion wheel 142, the driving helical gear 131 and the driven helical gear 15 are all arranged in the accommodation space 18. The driven extrusion wheel 142 is limited by the first bracket 16 and the second bracket 17. The transmission channel 100 is arranged through the extrusion assembly 10 from the accommodation space 18.

[0044] In one embodiment, the first bracket 16 and the second bracket 17 are two interconnected load-bearing structures in the extrusion assembly 10. The first bracket 16 includes a first main body portion 1601, and the second bracket 17 includes a second main body portion 171. A first mounting groove 1602 is provided on the surface of the first main body portion 1601 facing the second main body portion 171, and a second mounting groove 174 is provided on the surface of the second main body portion 171 facing the first main body portion 1601. The first mounting groove 1602 and the second mounting groove 174 together define an accommodation space 18. The reduction bevel gear 12, the driving bevel gear 131, and the driven bevel gear 15 are all disposed in the first mounting groove 1602. The driving extrusion wheel 141 and the driven extrusion wheel 142 are disposed in the second mounting groove 174. The driving wheel shaft 11 extends from the first mounting groove 1602 into the second mounting groove 174. The first main body portion 1601 and the second main body portion 171 are connected by fastening structures such as bolts.

[0045] In one embodiment, a first coordination hole 1603 is formed in the side surface of the first main body portion 1601. A second coordination hole 172 is formed in the side surface of the second main body portion 171. The first coordination hole 1603 corresponds to the second coordination hole 172. The first bracket 16 further includes a first bearing 1604, and the second bracket 17 further includes a second bearing 173. The first bearing 1604 is configured to be received in the first coordination hole 1603. The second bearing 173 is configured to be received in the second coordination hole 172. One end of the driving wheel shaft 11 along its length direction is received in the first bearing 1604, and the other end of the driving wheel shaft 11 along its length direction is received in the second bearing 173. The driving wheel shaft 11 can rotate relative to the first bearing 1604 and the second bearing 173. The first bearing 1604 and the second bearing 173 can reduce the friction force received during the rotation of the driving wheel shaft 11, and reduce the possibility of jamming or even jamming of the driving wheel shaft 11 during rotation.

[0046] In one embodiment, the first bracket 16 further includes a first limiting flange 1605, and the first limiting flange 1605 protrudes from the hole surface of the first coordination hole 1603. The end surface of the first bearing 1604 facing away from the second bearing 173 abuts against the first limiting flange 1605. The first limiting flange 1605 is used to limit the first bearing 1604 from disengaging from the first mounting hole. The second bracket 17 further includes a second limiting flange 175, and the second limiting flange 175 protrudes from the hole surface of the second mounting hole. The end surface of the second bearing 173 facing away from the first bearing 1604 abuts against the second limiting flange 175. The second limiting flange 175 is used to limit the second bearing 173 from disengaging from the second mounting hole. The first bearing 1604 and the second bearing 173 are clamped between the first main body portion 1601 and the second main body portion 171, thereby improving the installation stability of the driving wheel shaft 11.

[0047] In one embodiment, the driving wheel shaft 11 includes a first shaft section 111, a second shaft section 112, a third shaft section 113, and a fourth shaft section 114 connected in sequence. The first shaft section 111 is configured to be received in the first bearing 1604. The reduction bevel gear 12 is sleeved and connected to the second shaft section 112. The driving extrusion wheel 141 is sleeved and connected to the third shaft section 113. One end of the second shaft section 112 abuts against the end face of the first bearing 1604 facing the second bearing 173, and the other end of the second shaft section 112 abuts against the driving extrusion wheel 141. The fourth shaft section 114 is configured to be received in the second bearing 173, and one end of the third shaft section 113 facing away from the second shaft section 112 abuts against the end face of the second bearing 173 facing the first bearing 1604. The outer diameter of the second shaft section 112 is greater than the outer diameter of the third shaft section 113, and the outer diameter of the third shaft section 113 is greater than the outer diameter of the fourth shaft section 114. In this way, the second shaft section 112 can limit the driving extrusion wheel 141, and the first bearing 1604 can limit the reduction bevel gear 12, reducing the axial movement offset of the driving extrusion wheel 141 and the axial movement offset of the reduction bevel gear 12, thereby further improving the reliability of the consumable extrusion of the extrusion assembly 10.

[0048] Meanwhile, separating and assembling the driving wheel shaft 11, the driving extrusion wheel 141, and the reduction bevel gear 12 can realize the separate processing of each part, reducing the part processing difficulty and processing cost.

[0049] In one embodiment, the first bracket 16 further includes a support portion 1606. The support portion 1606 is connected to the side of the first main body portion 1601 facing away from the second bracket 17. The first main body portion 1601 further defines an avoidance hole 1607. The driving assembly 13 further includes a driving motor 132 and a driving shaft 133. The driving motor 132 is fixedly connected to the first main body portion 1601 and is located above the support portion 1606. The driving shaft 133 extends into the first installation groove 1602 from the avoidance hole 1607, and the driving bevel gear 131 is sleeved and connected to the driving shaft 133.

[0050] In one embodiment, the driving shaft 133 includes a connected connection section 1331 and a limiting section 1332. The driving bevel gear 131 is sleeved and connected to the connection section 1331. The outer diameter of the connection section 1331 is smaller than the outer diameter of the limiting section 1332. The limiting section 1332 is located between the connection section 1331 and the driving motor 132, and the limiting section 1332 is configured to be received in the avoidance hole 1607. The limiting section 1332 can limit the axial movement of the driving bevel gear 131 to improve the rotational stability of the driving bevel gear 131, and further improve the rotational stability of the reduction bevel gear 12 and the driving extrusion wheel 141, and improve the stability of the consumable material conveying.

[0051] In one embodiment, the first bracket 16 further includes a first pin 1608. The first pin 1608 is fixed to the first main body portion 1601. The extending direction of the first pin 1608 is parallel to the extending direction of the driving wheel shaft 11, and the first pin 1608 is disposed radially outside the reduction bevel gear 12. The driven bevel gear 15 is sleeved and connected to the first pin 1608. The driven bevel gear 15 can rotate relative to the first pin 1608 to achieve the meshing of the driven bevel gear 15 and the reduction bevel gear 12, so that the driven bevel gear 15 plays a role in limiting the spatial position of the reduction bevel gear 12.

[0052] In one embodiment, the extrusion assembly 10 further includes a second pin 191. The second pin 191 is disposed in the accommodation space 18. The extending direction of the second pin 191 is parallel to the extending direction of the driving wheel shaft 11, and the second pin 191 is disposed on one radial side of the driving wheel shaft 11. The driven extrusion wheel 142 is sleeved and connected to the second pin 191. The second pin 191 can be fixedly connected between the first bracket 16 and the second bracket 17, or can be movably connected between the first bracket 16 and the second bracket 17. The driven extrusion wheel 142 can rotate relative to the second pin 191. The driving extrusion wheel 141 is connected to the driving wheel shaft 11, and the driving wheel shaft 11 can rotate relative to the first bracket 16 and the second bracket 17, so that the driving extrusion wheel 141 and the driven extrusion wheel 142 can cooperate with each other to realize the extrusion of the consumable.

[0053] In one embodiment, the first bracket 16 further includes a first side wall 1609, a second side wall 1610, a third side wall 1611, and a fourth side wall 1612. The first side wall 1609, the second side wall 1610, the third side wall 1611, and the fourth side wall 1612 are sequentially connected to the edge of the first main body portion 1601. The first side wall 1609, the second side wall 1610, the third side wall 1611, the fourth side wall 1612, and the first main body portion 1601 enclose a first installation groove 1602. The reduction bevel gear 12 is disposed in the first installation groove 1602. One end of the fourth side wall 1612, the third side wall 1611, and a part of the outer peripheral surface of the reduction bevel gear 12 jointly define a first installation space 16021, and the driving bevel gear 131 is disposed in the first installation space 16021. The other end of the fourth side wall 1612, the first side wall 1609, and another part of the outer peripheral surface of the reduction bevel gear 12 jointly define a second installation space 16022, and the driven bevel gear 15 is disposed in the second installation space 16022. In this way, the space utilization rate of the first installation groove 1602 can be improved, and the structural compactness of the extrusion assembly 10 can be improved.

[0054] In this embodiment, the first side wall 1609 and the third side wall 1611 are arranged opposite to each other at intervals, and the distribution directions of the first side wall 1609 and the third side wall 1611 are the same as the distribution directions of the active extrusion wheel 141 and the driven extrusion wheel 142. The second side wall 1610 and the fourth side wall 1612 are arranged opposite to each other at intervals.

[0055] In one embodiment, the first side wall 1609 includes a first wall body 16091 and a second wall body 16092. The first wall body 16091 is connected to the fourth side wall 1612, and the second wall body 16092 is connected to the second side wall 1610. The first wall body 16091 and the second wall body 16092 are arranged at intervals and form an avoidance opening 16093. A part of the edge of the reduction bevel gear 12 extends into the avoidance opening 16093. In this way, the weight of the extrusion assembly 10 can be reduced, the size of the extrusion assembly 10 can be reduced, and the structural compactness of the extrusion assembly 10 can be improved, which is conducive to realizing the lightweight and miniaturized design of the extrusion assembly 10.

[0056] In one embodiment, a first avoidance groove 16094 is provided on the side surface of the first wall body 16091, and a part of the edge of the driven bevel gear 15 extends into the first avoidance groove 16094. The first avoidance groove 16094 can further reduce the size of the extrusion assembly 10 and improve the structural compactness of the extrusion assembly 10.

[0057] In one embodiment, there are two driven bevel gears 15. The two driven bevel gears 15 include a first driven bevel gear 151 and a second driven bevel gear 152. The driving bevel gear 131, the first driven bevel gear 151, and the second driven bevel gear 152 are arranged at intervals from each other. The first driven bevel gear 151 and the second driven bevel gear 152 are respectively configured to mesh with the reduction bevel gear 12. There are two first pins 1608. The first driven bevel gear 151 is sleeved and connected to one first pin 1608, and the second driven bevel gear 152 is sleeved and connected to the other first pin 1608.

[0058] By limiting the reduction bevel gear 12 at different positions through the first driven bevel gear 151 and the second driven bevel gear 152, the limiting effect on the reduction bevel gear 12 can be improved, further alleviating the radial run - through problem between the reduction bevel gear 12 and the driving wheel shaft 11 caused by the machining gap, enabling the reduction bevel gear 12 to still maintain a tight fixation with the driving wheel shaft 11 during the transmission process, reducing the possibility of the reduction bevel gear 12 driving the active extrusion wheel 141 to run through, so as to further improve the position stability between the active extrusion wheel 141 and the driven extrusion wheel 142, and improving the stability and accuracy of the extrusion assembly 10 for conveying consumables.

[0059] In one embodiment, a second avoidance groove 16101 is formed on the side of the second wall 16092. The first driven bevel gear 151 is disposed in the first avoidance groove 16094. The second driven bevel gear 152 is disposed in the second avoidance groove 16101. This improves the space utilization of the first bracket 16.

[0060] In one embodiment, the first driven bevel gear 151 has a first center point 1510, the second driven bevel gear 152 has a second center point 1520, the driving bevel gear 131 has a third center point 134, the driving wheel shaft 11 has a fourth center point 115, the first center point 1510, the second center point 1520, and the third center point 134 are sequentially connected to form an acute triangle area 193, and the fourth center point 115 is located inside the acute triangle area 193.

[0061] In this way, along the radial direction of the reduction helical gear 12, the reduction helical gear 12 is clamped between one and the other two of the driving helical gear 131, the first driven helical gear 151 and the second driven helical gear 152, thereby further improving the limiting effect of the reduction helical gear 12, and further reducing the radial displacement of the reduction helical gear 12, thereby improving the phase position stability of the reduction helical gear 12 and the driving wheel shaft 11.

[0062] Among them, the first center point 1510 refers to the intersection of the rotation axis of the first driven bevel gear 151 and the plane perpendicular to the length direction of the driving wheel shaft 11. The second center point 1520 refers to the intersection of the rotation axis of the second driven bevel gear 152 and the plane perpendicular to the length direction of the driving wheel shaft 11. The third center point 134 refers to the intersection of the rotation axis of the driving bevel gear 131 and the plane perpendicular to the length direction of the driving wheel shaft 11. The fourth center point 115 refers to the intersection of the rotation axis of the reduction bevel gear 12 and the plane perpendicular to the length direction of the driving wheel shaft 11.

[0063] In one embodiment, the line connecting the first center point 1510 and the second center point 1520 and the line connecting the second center point 1520 and the third center point 134 have a first angle α, the line connecting the first center point 1510 and the second center point 1520 and the line connecting the first center point 1510 and the third center point 134 have a second angle β, and the line connecting the second center point 1520 and the third center point 134 and the line connecting the first center point 1510 and the third center point 134 have a third angle γ. The first angle α, the second angle β, and the third angle γ are all acute angles. Specifically, α=β=γ=60°.

[0064] Further integration Figure 9As shown in the figure, an embodiment of the present application further provides a nozzle unit 1, which includes a nozzle assembly 192 and an extrusion assembly 10 as described in any one of the foregoing embodiments. The nozzle assembly 192 is connected to the extrusion assembly 10, and the transmission channel 100 further penetrates through the nozzle assembly 192.

[0065] Further in combination Figure 10 As shown in the figure, an embodiment of the present application further provides a 3D printing device 2, which includes a forming platform 21, a transmission assembly 22, and an extrusion assembly 10 as described in any one of the foregoing embodiments or the nozzle unit 1 as described above. The transmission assembly 22 drives the nozzle unit 1 to move relative to the forming platform 21.

[0066] In the foregoing, specific embodiments of the present application have been described with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that various changes and substitutions can be made to the specific embodiments of the present application without departing from the spirit and scope of the present application. These changes and substitutions all fall within the scope defined by the present application.

Claims

1. An extrusion component, characterized in that: The extrusion assembly comprises: Drive axle; An active extrusion wheel, which is sleeved and connected to the active wheel shaft; A reduction helical gear, sleeved and connected to the driving wheel shaft; a drive assembly including a drive helical gear configured to mesh with the reduction helical gear; A driven helical gear is disposed at a distance from the driving helical gear, and the driven helical gear is configured to mesh with the reduction helical gear.

2. The extrusion assembly according to claim 1, characterized in that The extrusion assembly has a transmission channel for transmitting consumables, and the extrusion assembly also includes: A driven extrusion wheel meshed with the active extrusion wheel, the driven extrusion wheel and the active extrusion wheel being used for extruding consumables; The active extrusion wheel and the driven extrusion wheel are respectively located on opposite sides of the transmission channel, the rotation axis of the driving bevel gear is located on one side of the transmission channel, and the rotation axis of the driven bevel gear is located on the other side of the transmission channel.

3. The extrusion assembly according to claim 1, characterized in that There are two driven helical gears, including a first driven helical gear and a second driven helical gear. The driving helical gear, the first driven helical gear and the second driven helical gear are spaced apart from each other. The first driven helical gear and the second driven helical gear are both configured to mesh with the reduction helical gear.

4. The extrusion assembly according to claim 3, characterized in that The first driven bevel gear has a first center point, the second driven bevel gear has a second center point, the driving bevel gear has a third center point, and the driving wheel shaft has a fourth center point. The first center point, the second center point, and the third center point are sequentially connected to form an acute triangle area, and the fourth center point is located inside the acute triangle area.

5. The extrusion assembly according to claim 1, characterized in that The extrusion assembly further comprises: First bracket; The second bracket is connected to the first bracket, and the second bracket and the first bracket enclose a containing space, and the reduction bevel gear, the active extrusion wheel, the driving bevel gear and the driven bevel gear are all arranged in the containing space.

6. The extrusion assembly according to claim 5, characterized in that The first bracket includes a first main body, a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall, the second side wall, the third side wall and the fourth side wall are sequentially connected to the edge of the first main body, the first side wall, the second side wall, the third side wall, the fourth side wall and the first main body are arranged to form a first mounting groove, the reduction bevel gear is arranged in the first mounting groove, one end of the fourth side wall, the third side wall and a part of the outer circumference of the reduction bevel gear jointly define a first mounting space, the driving bevel gear is arranged in the first mounting space, the other end of the fourth side wall, the first side wall and another part of the outer circumference of the reduction bevel gear jointly define a second mounting space, and the driven bevel gear is arranged in the second mounting space.

7. The extrusion assembly according to claim 5, characterized in that The first bracket includes a first main body, a first latch and a support part, the first latch and the support part are arranged on opposite sides of the first main body, the first main body is also provided with an avoidance hole, the driving assembly also includes a driving motor, the driving motor is arranged on the support part, the driven bevel gear is sleeved and connected to the first latch, the driving shaft of the driving motor is constructed to pass through the avoidance hole and extend to the side of the first main body facing the second bracket, and the driving bevel gear is sleeved and connected to the part of the driving shaft extending to the outside of the first main body.

8. The extrusion assembly according to claim 1, characterized in that The driving helical gear and the driven helical gear are configured as helical gear structures having the same shape.

9. The extrusion assembly according to claim 1, characterized in that The reduction bevel gear and the active extrusion wheel are arranged at intervals along the axial direction of the active wheel shaft.

10. A nozzle unit, characterized in that: It comprises a nozzle assembly and an extrusion assembly as claimed in any one of claims 1 to 9, wherein the nozzle assembly is connected to the extrusion assembly.

11. A 3D printing device, characterized in that: It comprises a molding platform and a driving assembly, and an extrusion assembly as described in any one of claims 1 to 9 or a nozzle unit as described in claim 10, wherein the driving assembly drives the nozzle unit to move relative to the molding platform.

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