Spray head assembly and 3D printing device applying same

Abstract

The embodiment of the utility model provides a spray head assembly and a 3D printing device applying the same. The nozzle assembly comprises a main body part which is used for being connected with the transmission belt, and the nozzle assembly further comprises an assembling part which is used for enabling the transmission belt to be detachably connected to the main body part. The assembly part comprises a first plate part and a second plate part, the first plate part is connected with the second plate part, and at least one of the first plate part and the second plate part is connected with the transmission belt. The two opposite ends of the second plate part are both provided with open grooves in a penetrating mode, the two opposite ends of the second plate part are further provided with notches, and the notches communicate with the open grooves. The 3D printing device comprises a forming platform, a driving assembly and the nozzle assembly, and the driving assembly drives the nozzle assembly to move relative to the forming platform through a transmission belt.

Description

Technical Field

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

[0002] 3D printing technology is a rapid prototyping technology that uses digital model files as the basis, special wax materials, powdered metals or plastics and other bondable materials to print layers of materials to create three-dimensional objects. Fused deposition modeling technology is one of the main 3D printing technologies. This technology heats and melts the hot-melt filament, squeezes it out from the nozzle, and deposits it on the molding platform or the previous layer of solidified material to finally generate a physical object.

[0003] During the 3D printing process, the molding platform and the nozzle assembly need to move relative to each other to achieve printing. The nozzle assembly usually needs to be connected to a transmission belt, which drives the nozzle assembly to move, and the dual transmission belt drive method is more common. For the installation of two transmission belts, there are many solutions in the prior art. One is to directly connect each transmission belt to the inside of the nozzle assembly. This method has certain requirements for the assembly sequence and will drag down the installation efficiency; the other is to install the two transmission belts on a transfer connector, and then install the transfer connector on the nozzle assembly, but the nozzle assembly itself is relatively small in size. How to set the structure of the transfer connector to improve the convenience of assembly is what technicians in this field need to consider. Utility Model Content

[0004] In order to solve the problems in the prior art, the embodiments of the present application provide a nozzle assembly that is easy to assemble and a 3D printing device using the same.

[0005] The embodiment of the present application provides a nozzle assembly, which includes a main body, the main body is used to connect with a transmission belt, the nozzle assembly also includes an assembly part, the assembly part is used to make the transmission belt detachably connected to the main body, and the assembly part includes a first plate part and a second plate part. The first plate part is connected to the second plate part, and at least one of the first plate part and the second plate part is connected to the transmission belt. The two opposite ends of the second plate part are both provided with a slotted structure, and the two opposite ends of the second plate part are also provided with a notch structure, and the notch structure is connected to the slotted structure.

[0006] In one embodiment, the second plate portion is provided with the slot structure along a first direction, and the first direction is a thickness direction of the second plate portion.

[0007] In one embodiment, the second plate portion is extended along the second direction, and two ends of the second plate portion opposite to each other along the second direction each have a notch structure, and the opening directions of the two notch structures are opposite to each other along the second direction.

[0008] In one embodiment, two opposite ends of the second plate portion along the second direction are a first end and a second end, the first end is provided with a first slot and a first notch connected, and the second end is provided with a second slot and a second notch connected.

[0009] In one embodiment, the first plate portion and the second plate portion are stacked along the first direction.

[0010] In one embodiment, a gap is defined between the first plate portion and the second plate portion, and the gap is configured to allow the transmission belt to be fitted therein.

[0011] In one embodiment, the second plate portion includes a first surface and a second surface opposite to each other, the first surface is a surface of the second plate portion facing away from the first plate portion, the second surface is a surface of the second plate portion facing the first plate portion, and at least one of the first surface and the second surface is used to connect to the transmission belt.

[0012] In one embodiment, both the first surface and the second surface are provided with a locking structure, and the locking structure is used for engaging and connecting with the transmission belt.

[0013] In one embodiment, the first plate portion and the second plate portion are connected by a bridging portion, and the bridging portion divides the gap into a first gap and a second gap, and the first gap and the second gap are used to allow different transmission belts to be arranged therein in a cooperative manner.

[0014] An embodiment of the present application further provides a 3D printing device, which includes a molding platform, a driving assembly, and a nozzle assembly as described in any one of the aforementioned embodiments, wherein the driving assembly drives the nozzle assembly to move relative to the molding platform through the transmission belt.

[0015] Furthermore, the main body of the nozzle assembly of the present application is connected to the transmission belt through an assembly part. The assembly part includes a first plate part and a second plate part that are connected, and at least one of the first plate part and the second plate part is connected to the transmission belt to achieve the connection between the transmission belt and the assembly part. Both ends of the second plate part that are opposite to each other are penetrated by a slotted structure, and a notch structure connected to the slotted structure. The slotted structure at one end can be used to allow an assembly part such as a bolt to pass through to fix one end of the second plate part to the main body. The assembly part connected to the transmission belt moves to a predetermined position with its fixed end as a fulcrum, and then the other end is fixed to the main body to complete the assembly. During the above-mentioned movement, the notch structure can be used to avoid the main body and other units, and facilitate the other end to be fixed by the assembly part. The nozzle assembly of the present application therefore has a higher assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional schematic diagram of a nozzle assembly provided in an embodiment of the present application at one angle.

[0017] Figure 2 A three-dimensional schematic diagram of the nozzle assembly provided in an embodiment of the present application from another angle.

[0018] Figure 3 A three-dimensional schematic diagram of the assembly parts of the nozzle assembly provided in an embodiment of the present application from a top view.

[0019] Figure 4 A three-dimensional schematic diagram of the assembly parts of the nozzle assembly provided in an embodiment of the present application, viewed from a bottom angle.

[0020] Figure 5 A three-dimensional schematic diagram of the assembly parts of the nozzle assembly provided in an embodiment of the present application from a side view.

[0021] Figure 6 for Figure 4 Schematic cross-sectional view along direction VI-VI.

[0022] Figure 7 A schematic diagram of an assembly method for the assembly parts and the transmission belt of the nozzle assembly provided in an embodiment of the present application.

[0023] Figure 8 A schematic diagram of an assembly method in which assembly parts of a nozzle assembly provided in an embodiment of the present application are assembled to a main body.

[0024] Fig. 9 A three-dimensional schematic diagram of a 3D printing device provided in an embodiment of the present application.

[0025] Main component symbols

[0026] Sprinkler assembly 10

[0027] Main body 11

[0028] First assembly hole 111

[0029] Second assembly hole 112

[0030] First assembly 113

[0031] Second assembly 114

[0032] Assembly parts 12

[0033] The first plate portion 121

[0034] The second plate portion 122

[0035] First surface 1221

[0036] Second surface 1222

[0037] First End 1223

[0038] Second end 1224

[0039] Slotted structure 1225

[0040] First slot 12251

[0041] Second slot 12252

[0042] Gap Structure 1226

[0043] First gap 12261

[0044] The second gap 12262

[0045] Stop structure 1227

[0046] Bridge portion 123

[0047] Gap 124

[0048] First gap 1241

[0049] Second gap 1242

[0050] Transmission belt 13

[0051] Forming platform 14

[0052] Drive assembly 15

[0053] 3D printing device 1

[0054] First direction X

[0055] Second direction Y

[0056] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0057] The following description will refer to the accompanying drawings to more fully describe the content of the present application. The accompanying drawings show exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be interpreted as being 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 represent identical or similar components. The terms used herein are only used for the purpose of describing specific exemplary embodiments and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "one", "an" and "the" are intended to also include plural forms. In addition, when used herein, "including" and / or "comprising" and / or "having", 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 meanings as those generally understood by ordinary technicians in the field to which the present application belongs. Furthermore, unless explicitly defined herein, terms such as those defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the relevant art and the content of this application, and will not be interpreted as idealized or overly formal meanings.

[0058] Usually, in the process of 3D printing, it is necessary to make the molding platform and the nozzle assembly move relative to each other to achieve printing. The nozzle assembly usually needs to be connected to a transmission belt, which drives the nozzle assembly to move, and the dual transmission belt drive method is more common. For the installation of two transmission belts, there are many solutions in the prior art. One is to directly connect each transmission belt to the inside of the nozzle assembly. This method has certain requirements for the assembly sequence and will drag down the installation efficiency; the other is to install the two transmission belts on a transfer connector, and then install the transfer connector on the nozzle assembly, but the nozzle assembly itself is relatively small in size. How to set the structure of the transfer connector to improve the convenience of assembly is what technicians in this field need to consider.

[0059] Correspondingly, an embodiment of the present application provides a nozzle assembly and a 3D printing device using the same. An embodiment of the present application provides a nozzle assembly and a 3D printing device using the same. The nozzle assembly includes a main body, which is used to be connected to a transmission belt. The nozzle assembly also includes an assembly part, which is used to make the transmission belt detachably connected to the main body. The assembly part includes a first plate part and a second plate part, the first plate part is connected to the second plate part, and at least one of the first plate part and the second plate part is connected to the transmission belt. Both ends of the second plate part opposite to each other are provided with slots, and both ends of the second plate part opposite to each other are also provided with notches, and the notches are connected to the slots. The 3D printing device includes a molding platform, a drive assembly and the nozzle assembly, and the drive assembly drives the nozzle assembly to move relative to the molding platform through the transmission belt.

[0060] Furthermore, the main body of the nozzle assembly of the present application is connected to the transmission belt through an assembly part. The assembly part includes a first plate part and a second plate part that are connected, and at least one of the first plate part and the second plate part is connected to the transmission belt to realize the connection between the transmission belt and the assembly part. Both ends of the second plate part that are opposite to each other are penetrated by a slotted structure, and a notch structure connected to the slotted structure. The slotted structure at one end can be used to allow an assembly part such as a bolt to pass through to fix one end of the second plate part to the main body. The assembly part connected to the transmission belt moves to a predetermined position with its fixed end as a fulcrum, and then the other end is fixed to the main body to complete the assembly. During the above-mentioned movement, the notch structure can be used to avoid the main body and other units, and facilitate the other end to be fixed by the assembly part. The nozzle assembly of the present application therefore has a higher assembly efficiency.

[0061] Those skilled in the art can understand that "3D printing" refers to a technology that uses a digital model file as the basis, and uses powdered metal or plastic and other bondable materials to construct objects by printing layer by layer.

[0062] The following 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; and the same or similar components will be given the same or similar reference numerals or similar technical terms.

[0063] The specific implementation methods of the present application are further described in detail below with reference to the accompanying drawings.

[0064] like Figure 1 and Figure 2 As shown, the embodiment of the present application provides a nozzle assembly 10. The nozzle assembly 10 includes a main body 11 and an assembly part 12. The main body 11 is used to be connected to a transmission belt 13, and the assembly part 12 is used to make the transmission belt 13 detachably connected to the main body 11.

[0065] It can be understood that the main body 11 may include other major components of the nozzle assembly 10 except the assembly parts 12. For example, the main body 11 may include a bracket, a nozzle component, a circuit board, a cooling component, etc. (the above structures can all be parts or components, units, etc. with corresponding functions in the prior art, and their structures and functions are not repeated here).

[0066] In this embodiment, the structure of the main body 11 for fixed connection with the assembly part 12 is the bracket (not shown). A group of assembly holes is provided on both sides of the main body 11, each group of assembly holes includes a first assembly hole 111 and a second assembly hole 112 spaced apart, and the first assembly holes 111 and the second assembly holes 112 are spaced apart along the length direction of the assembly part 12. Each first assembly hole 111 is used to allow a first assembly part 113 to be matched therein to fix one end of an assembly part 12; each second assembly hole 112 is used to allow a second assembly part 114 to be matched therein to fix the other end of an assembly part 12.

[0067] It can be understood that the first assembly hole 111 and the second assembly hole 112 can be threaded holes, and the first assembly part 113 and the second assembly part 114 can be bolts. The threaded sections of the first assembly part 113 and the second assembly part 114 are respectively arranged in the first assembly hole 111 and the second assembly hole 112, so that the nuts of the first assembly part 113 and the second assembly part 114 press against the assembly part 12, and the rods of the first assembly part 113 and the second assembly part 114 are further connected to the assembly part 12, thereby realizing the connection between the assembly part 12 and the main body 11.

[0068] Further integration Figure 3 As shown, in one embodiment, the assembly part 12 includes a first plate portion 121, a second plate portion 122 and a bridge portion 123, the first plate portion 121 and the second plate portion 122 are connected by the bridge portion 123, and at least one of the first plate portion 121 and the second plate portion 122 is connected to the transmission belt 13. The two opposite ends of the second plate portion 122 are penetrated by a slot structure 1225, and the two opposite ends of the second plate portion 122 are also provided with a notch structure 1226, and the notch structure 1226 is connected to the slot structure 1225.

[0069] It can be understood that the assembly part 12 includes a first plate portion 121 and a second plate portion 122 connected to each other, and at least one of the first plate portion 121 and the second plate portion 122 is connected to the transmission belt 13 to achieve the connection between the transmission belt 13 and the assembly part 12. The two opposite ends of the second plate portion 122 are penetrated by a slotted structure 1225, and a notch structure 1226 connected to the slotted structure 1225. The slotted structure 1225 at one end can be used to allow an assembly part such as a bolt to pass through to fix one end of the second plate portion 122 on the main body 11. The assembly part 12 connected to the transmission belt 13 moves to a predetermined position with its fixed end as a fulcrum, and then the other end is fixed to the main body 11 to complete the assembly. During the above-mentioned movement process, the notch structure 1226 can be used to avoid the main body 11 and other units, and facilitate the other end to be fixed by the assembly part. The nozzle assembly 10 of the present application therefore has a higher assembly efficiency.

[0070] In this embodiment, the slotted structure 1225 passes through the second plate portion 122, and the interior of the slotted structure 1225 can be configured as an arc-shaped extended surface to fit the rod of the bolt, so that the assembly part 12 can still move in a rotational manner compared to the bolt after being fixed by the bolt. It can be understood that the slotted structure 1225 is used to allow the bolt to pass through the assembly part 12 and guide and limit the rotation of the assembly part 12 compared to the bolt.

[0071] In this embodiment, the notch structure 1226 is located at the endmost side of the second plate portion 122, and the notch structure 1226 is directly adjacent to and connected to the slotted structure 1225. The notch structure 1226 enables the bolt to enter or leave the slotted structure 1225 from the side of the slotted structure 1225 (not along the penetration direction of the slotted structure 1225), thereby avoiding the interference of the side plate of the assembly part 12 with the installation process of the first assembly part 113 and the second assembly part 114. On the other hand, the notch structure 1226 provided on the second plate portion 122 removes the end of the second plate portion 122, thereby making the length of the second plate portion 122 smaller while satisfying the necessary functions, thereby avoiding the interference of the assembly part 12 during the installation process of the nozzle assembly 10 with a smaller volume.

[0072] In other embodiments, the locations of the notch structure 1226 and the slot structure 1225 may be adjusted according to specific requirements during the installation of the assembly part 12 , and the notch structure 1226 and the slot structure 1225 may be kept connected to each other.

[0073] Further integration Figure 4 As shown, in one embodiment, the second plate portion 122 is extended along the second direction Y, and a notch structure 1226 is respectively formed at two opposite ends of the second plate portion 122 along the second direction Y. The opening directions of the two notch structures 1226 are opposite to each other along the second direction Y.

[0074] In one embodiment, the two opposite ends of the second plate portion 122 along the second direction Y are a first end 1223 and a second end 1224 . The first end 1223 defines a first slot 12251 and a first notch 12261 , and the second end 1224 defines a second slot 12252 and a second notch 12262 .

[0075] It can be understood that the middle part of the assembly part 12 is designed to be connected to the transmission belt 13. The notch structure 1226 and the slot structure 1225 are provided at the opposite ends of the second plate portion 122 to avoid the transmission belt 13, thereby avoiding interference. The two notch structures 1226 are arranged in opposite directions to facilitate the installation of the bolts. In other embodiments, the opening direction of the notch structure 1226 can also be adaptively adjusted according to the installation structure of the first assembly part 113 and the second assembly part 114.

[0076] In this embodiment, the first plate portion 121 and the second plate portion 122 are symmetrically arranged compared to the bridge portion 123, the first end 1223 and the second end 1224 are respectively located on opposite sides of the bridge portion 123 along the second direction Y, and the first end 1223 and the second end 1224 are symmetrical in structure. Furthermore, the first slot 12251 and the first notch 12261 provided at the first end 1223 are respectively symmetrical with the second slot 12252 and the second notch 12262 provided at the second end 1224, so as to facilitate the installation of the assembly part 12.

[0077] Further integration Figure 5 and Figure 6 As shown, in one embodiment, the second plate portion 122 is provided with a slot structure 1225 along a first direction X, and the first direction X is a thickness direction of the second plate portion 122 .

[0078] It can be understood that the slotted structure 1225 is completely penetrated by the second plate portion 122 along the first direction X, and the first assembly part 113 and the second assembly part 114 can pass through the assembly part 12 with the help of the slotted structure 1225 and further be connected to the main body 11 .

[0079] In one embodiment, the first plate portion 121 and the second plate portion 122 are stacked along the first direction X.

[0080] In this embodiment, the length of the first plate portion 121 is less than that of the second plate portion 122, the first plate portion 121 and the second plate portion 122 are stacked along the first direction X, and the first plate portion 121 avoids the slotted structure 1225 along the first direction X, so that the slotted structure 1225 is not blocked. If necessary, an opening can be opened on the first plate portion 121 corresponding to the slotted structure 1225 to further enhance the effect of avoiding the slotted structure 1225.

[0081] In one embodiment, a gap 124 is defined between the first plate portion 121 and the second plate portion 122 . The gap 124 is configured to allow the transmission belt 13 to be disposed therein.

[0082] It can be understood that the first plate portion 121 and the second plate portion 122 are connected by the bridge portion 123, and the bridge portion 123 also provides support. The bridge portion 123 allows the first plate portion 121 and the second plate portion 122 to be stacked along the first direction X while maintaining a gap to form a gap 124. The gap 124 can be used to accommodate the transmission belt 13, so that the transmission belt 13 is connected to at least one of the first plate portion 121 and the second plate portion 122. While fixing the transmission belt 13, the transmission belt 13 can also be shielded to improve the appearance.

[0083] It can be understood that the first plate portion 121 and the second plate portion 122 often have a smaller thickness. The stacked first plate portion 121 and the second plate portion 122 can not only help achieve the aforementioned fixation, aesthetics and other functions, but also increase the overall thickness of the assembly part 12, making it easier for operators to grasp the assembly part 12 during operation, thereby improving assembly efficiency.

[0084] In one embodiment, the bridge portion 123 divides the gap 124 into a first gap 1241 and a second gap 1242 . The first gap 1241 and the second gap 1242 are used to allow different transmission belts 13 to be disposed therein.

[0085] It can be understood that the first gap 1241 and the second gap 1242 are separated by the bridging portion 123 , which makes it easier for assemblers to install and fix the two transmission belts 13 respectively, thereby improving assembly efficiency.

[0086] In one embodiment, the second plate portion 122 includes a first surface 1221 and a second surface 1222 opposite to each other, the first surface 1221 is the surface of the second plate portion 122 away from the first plate portion 121, and the second surface 1222 is the surface of the second plate portion 122 facing the first plate portion 121, and at least one of the first surface 1221 and the second surface 1222 is used to connect to the transmission belt 13.

[0087] In one embodiment, both the first surface 1221 and the second surface 1222 are provided with a locking structure 1227 , and the locking structure 1227 is used to engage with the transmission belt 13 .

[0088] In this embodiment, the locking structure 1227 is connected to the first surface 1221 and the second surface 1222, and is protruded compared to the first surface 1221 and the second surface 1222, and the protruding portion of the locking structure 1227 can be extended along the second direction Y. This kind of locking structure 1227 can be engaged with the buckle on the surface of the general transmission belt 13 to achieve the fixation of the transmission belt 13 and the assembly part 12.

[0089] Further integration Figure 7 As shown, it is a connection method between the assembly part 12 and the transmission belt 13. In this connection method, the broken end of the transmission belt 13 is arranged in the gap 124 between the first plate portion 121 and the second plate portion 122 and is engaged with the locking structure 1227 on the second surface 1222. Then, the transmission belt 13 wraps around the second plate portion 122 and extends to the side of the second plate portion 122 away from the first plate portion 121. The transmission belt 13 is further engaged with the locking structure 1227 on the first surface 1221, and the transmission belt 13 is further extended in the direction away from the assembly part 12.

[0090] In other embodiments, the transmission belt 13 may also be only arranged between the first plate portion 121 and the second plate portion 122, and connected to one of the first plate portion 121 or the second plate portion 122 to complete the fixation; or, the transmission belt 13 may also be only arranged on the side of the second plate portion 122 away from the first plate portion 121, so that the transmission belt 13 is pressed onto the main body 11 by the assembly part 12 and completes the fixation.

[0091] Further integration Figure 8 The figure shows an intermediate state in which the assembly part 12 with the transmission belt 13 already fixed is installed on the main body 11. Before this state, one end of the assembly part 12 has been fixed to the first assembly hole 111 by the first assembly part 113. After this state, the assembly part 12 is pushed to rotate counterclockwise with the first assembly part 113 as the axis until the other end of the assembly part 12 reaches the corresponding second assembly hole 112, and then a second assembly part 114 is used to pass through the slot structure 1225 to the second assembly hole 112 to complete the fixing of the assembly part 12 and the main body 11 ( Figure 8 The left side shows the installed state).

[0092] It can be understood that during the assembly process, the first assembly part 113 can be preset in the first assembly hole 111 so that the assembly part can be engaged with the first assembly part 113 with the help of the notch structure 1226; during the rotation of the assembly part 12, the notch structure 1226 can also avoid the main body 11, thereby preventing the assembly part 12 from failing due to interference.

[0093] Further integration Fig. 9 As shown, the embodiment of the present application also provides a 3D printing device 1, which includes a molding platform 14, a driving assembly 15 and a nozzle assembly 10 as in any one of the aforementioned embodiments, and the driving assembly 15 drives the nozzle assembly 10 to move relative to the molding platform 14 through a transmission belt 13.

[0094] It can be understood that the assembly process of the nozzle assembly 10 and the transmission belt 13 of the 3D printing device 1 of the present application is highly efficient, which improves the assembly efficiency of the 3D printing device 1. At the same time, the nozzle assembly 10 and the transmission belt 13 are firmly connected, which improves the reliability and accuracy of the 3D printing device 1.

[0095] In the above, the specific implementation of the present application is described with reference to the accompanying drawings. However, those skilled in the art will appreciate that various changes and substitutions may be made to the specific implementation of the present application without departing from the spirit and scope of the present application. These changes and substitutions are all within the scope defined by the present application.

Claims

1. A nozzle assembly, comprising a main body, the main body being used to connect with a transmission belt, characterized in that: The nozzle assembly further includes an assembly part, which is used to detachably connect the transmission belt to the main body, and the assembly part includes: first plate portion; a second plate portion connected to the first plate portion, wherein at least one of the first plate portion and the second plate portion is connected to the transmission belt; Wherein, both ends of the second plate portion facing away from each other are penetrated with a slot structure, and both ends of the second plate portion facing away from each other are further provided with a notch structure, and the notch structure is communicated with the slot structure.

2. The nozzle assembly according to claim 1, characterized in that: The second plate portion is provided with the slot structure along a first direction, and the first direction is a thickness direction of the second plate portion.

3. The nozzle assembly according to claim 1, characterized in that: The second plate portion is extended along the second direction, and two ends of the second plate portion opposite to each other along the second direction each have a notch structure, and the opening directions of the two notch structures are opposite to each other along the second direction.

4. The nozzle assembly according to claim 3, characterized in that: Two opposite ends of the second plate portion along the second direction are a first end and a second end. The first end is provided with a first slot and a first notch connected thereto, and the second end is provided with a second slot and a second notch connected thereto.

5. The nozzle assembly according to claim 2, characterized in that: The first plate portion and the second plate portion are stacked along the first direction.

6. The nozzle assembly according to claim 1, characterized in that: A gap is defined between the first plate portion and the second plate portion, and the gap is used to allow the transmission belt to be fitted therein.

7. The nozzle assembly according to claim 6, characterized in that: The second plate portion includes a first surface and a second surface opposite to each other. The first surface is a surface of the second plate portion facing away from the first plate portion, and the second surface is a surface of the second plate portion facing the first plate portion. At least one of the first surface and the second surface is used to connect with the transmission belt.

8. The nozzle assembly according to claim 7, characterized in that: The first surface and the second surface are both provided with a locking structure, and the locking structure is used for engaging and connecting with the transmission belt.

9. The nozzle assembly according to claim 6, characterized in that: The first plate portion and the second plate portion are connected by a bridge portion, and the bridge portion divides the gap into a first gap and a second gap, and the first gap and the second gap are used to allow different transmission belts to be arranged therein in a matching manner.

10. A 3D printing device, characterized in that: It comprises a molding platform, a driving assembly and a nozzle assembly as described in any one of claims 1 to 9, wherein the driving assembly drives the nozzle assembly to move relative to the molding platform through the transmission belt.

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