Hot end structure, nozzle mechanism, and 3D printing device

Abstract

The application provides a hot end structure, a nozzle mechanism and a 3D printing device. The hot end structure comprises a heat dissipation block, a quick release assembly and a heating assembly. The heat dissipation block comprises a heat dissipation part and a connecting part, and the connecting part is arranged on one side of the heat dissipation block. The quick release assembly comprises a mounting seat and a locking piece, the connecting part is arranged opposite to the mounting seat, the mounting seat comprises a first part and a second part, one end of the first part is connected to the second part, the other end of the first part is arranged spaced apart from the second part, and the locking piece is detachably connected to the first part, the second part and the connecting part. The heating assembly comprises a heating block and a heating element, the heating block is partially clamped between the first part and the second part, and the heating element is arranged on the outer surface of the heating block. In this way, when the structure is affected by thermal expansion, the elastic clamping positioning mode between the mounting seat and the heating assembly can adapt to the thermal expansion deformation to a certain extent, thereby reducing the problem of structure loosening.

Description

Technical Field

[0001] This application relates to the field of 3D printing technology, and more specifically, to hot-end structures, nozzle mechanisms, and 3D printing equipment. Background Technology

[0002] In most current 3D printer structures, the heating element and the heat sink are connected longitudinally by screws and secured together to achieve the assembly and positioning of the hot-end structure. However, due to the differences in the coefficients of thermal expansion of different materials, the fixed connection structure between the heating element and the heat sink is prone to loosening over long-term use. Once loosened, it is difficult to adjust, affecting print quality. Utility Model Content

[0003] This application provides a hot-end structure, a nozzle mechanism, and a 3D printing device to solve the aforementioned technical problems.

[0004] The embodiments of this application are implemented as follows: A hot-end structure includes a heat sink, a quick-release assembly, and a heating assembly. The heat sink includes a heat dissipation portion and a connecting portion, with the connecting portion located on one side of the heat sink. The quick-release assembly includes a mounting base and a locking member. The connecting portion is disposed opposite to the mounting base. The mounting base includes a first part and a second part. One end of the first part is connected to the second part, and the other end of the first part is spaced apart from the second part. The locking member detachably connects the first part, the second part, and the connecting portion. The heating assembly includes a heating block and a heating element. The heating block is partially sandwiched between the first part and the second part, and the heating element is disposed on the outer surface of the heating block.

[0005] Thus, the hot-end structure of this application, by setting a quick-release mounting base and locking device between the heat sink and the heating component, uses the locking device to tighten the first and second parts, clamping and positioning the heating component on the mounting base while connecting the mounting base and the connecting part, keeping the heat sink, quick-release component and heating component relatively fixed. In addition, when the structure is affected by thermal expansion, the elastic clamping positioning method between the mounting base and the heating component can adapt to thermal expansion deformation to a certain extent, reducing the problem of structural loosening. The structure can also be reinforced or components can be quickly replaced by adjusting the locking device, improving print quality. The overall structure is simple and easy to operate, which is conducive to improving the user experience.

[0006] In one possible implementation: the locking member includes a supporting portion and a locking portion connected together, the supporting portion being disposed on the side of the first portion away from the second portion, and the locking portion passing through the first portion, the second portion and the connecting portion.

[0007] In one possible implementation: the connecting portion includes a first connecting portion and a second connecting portion disposed opposite to and spaced apart from each other, a mounting seat is disposed between the first connecting portion and the second connecting portion, and a locking member is disposed through the first connecting portion, the first part, the second part and the second connecting portion.

[0008] In one possible implementation: the heat sink further includes a top plate, a first side plate and a second side plate, the first side plate and the second side plate are connected to opposite sides of the top plate, the heat sink is connected to the top plate and is spaced between the first side plate and the second side plate, the first connecting part is located on the side of the first side plate away from the top plate, and the second connecting part is located on the side of the second side plate away from the top plate.

[0009] In one possible implementation: the connecting part is further provided with a positioning protrusion on the side facing the mounting base, the positioning protrusion abuts against the side of the mounting base facing the heat sink, and the positioning protrusion is spaced apart from the heat sink.

[0010] In one possible implementation: the first part includes a first section, a second section, and a third section; the second part includes a fourth section, a fifth section, and a sixth section; the first section connects to the fourth section; a mating groove is provided between the second and fifth sections; an adjusting gap is provided between the third and sixth sections, and the adjusting gap communicates with the mating groove; the heating block is partially clamped in the mating groove. The locking components include a first locking component and a second locking component; the first locking component passes through the first section, the fourth section, and the connecting portion; the second locking component passes through the third section, the adjusting gap, the sixth section, and the connecting portion.

[0011] In one possible implementation: an expansion gap is provided between the first section and the fourth section, the expansion gap is connected to the mating groove, and is set opposite to the adjustment gap.

[0012] In one possible implementation: the hot end structure also includes a nozzle assembly, which is partially inserted into the heating block.

[0013] An embodiment of this application also provides a nozzle mechanism, including an extrusion assembly and a hot end structure as described in the above embodiments, wherein the hot end structure is assembled at the discharge end of the extrusion assembly.

[0014] An embodiment of this application also provides a 3D printing device, including a printing body and a nozzle mechanism as described in the above embodiments, wherein the nozzle mechanism is assembled on the printing body. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a nozzle mechanism with a hot end structure according to an embodiment of this application.

[0017] Figure 2 for Figure 1 The diagram shows the exploded structure.

[0018] Figure 3 for Figure 2 A partial structural decomposition diagram of the structure shown.

[0019] Figure 4 for Figure 3 A partial structural diagram of the structure shown.

[0020] Figure 5 for Figure 4 A partial structural diagram of the structure shown.

[0021] Figure 6 This is a schematic diagram of the hot-end structure in another embodiment.

[0022] Figure 7 for Figure 6 The diagram shows the exploded structure.

[0023] Figure 8 for Figure 7 A partial structural diagram of the structure shown.

[0024] Figure 9 This is a schematic diagram of the structure of a 3D printing device in one embodiment.

[0025] Explanation of key component symbols: 1000 nozzle mechanism Hot end structure 100 Heat sink 10 Connecting part 11 First connecting part 111 Second connecting part 112 Positioning protrusion 113 Heat dissipation section 12 Top plate 13 First side panel 14 Second side panel 15 Quick-release component 20 Mounting base 21 Part 1, page 211 First section 2111 Second section 2112 Section 3 2113 Part Two 212 Section 4 2121 Section 5, 2122 Section 6, 2123 Mating groove 213 Adjustment gap 214 Expansion gap 215 First protrusion 216 Second protrusion 217 First recess 218 Second recess 219 Locking component 22 Resistance Department 221 Locking part 222 First locking element 223 Second locking element 224 Heating component 30 Heating block 31 Heating element 32 Thermistor 33 Nozzle assembly 40 Nozzle 41 Heating element 42 Material tube 43 Extrusion component 50 Printing body 60 Rack 61 Molding platform 62 Driver Component 63 The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0026] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0027] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] Some embodiments of this application are described in detail. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] See Figures 1 to 8 This embodiment provides a hot-end structure 100, including a heat sink 10, a quick-release assembly 20, and a heating assembly 30. The heat sink 10 includes a heat dissipation portion 12 and a connecting portion 11, with the connecting portion 11 disposed on one side of the heat sink 10. The quick-release assembly 20 includes a mounting base 21 and a locking member 22. The connecting portion 11 is disposed opposite to the mounting base 21. The mounting base 21 includes a first portion 211 and a second portion 212. One end of the first portion 211 is connected to the second portion 212, and the other end of the first portion 211 is spaced apart from the second portion 212. The locking member 22 detachably connects the first portion 211, the second portion 212, and the connecting portion 11. The heating assembly 30 includes a heating block 31 and a heating element 32. The heating block 31 is partially sandwiched between the first portion 211 and the second portion 212, and the heating element 32 is disposed on the outer surface of the heating block 31.

[0031] The hot-end structure 100 of this application provides a quick-release mounting base 21 and a locking member 22 between the heat sink 10 and the heating component 30. The locking member 22 tightens the first part 211 and the second part 212, clamping and positioning the heating component 30 in the mounting base 21. At the same time, it connects the mounting base 21 and the connecting part 11, keeping the heat sink 10, the quick-release component 20 and the heating component 30 relatively fixed. When the structure is affected by thermal expansion, the elastic clamping and positioning method between the mounting base 21 and the heating component 30 can adapt to thermal expansion deformation to a certain extent, reducing the problem of structural loosening. The structure can also be reinforced or components can be quickly replaced by adjusting the locking member 22, improving print quality. The overall structure is simple and easy to operate, which helps to improve the user experience.

[0032] Please see Figure 1 , Figure 2 and Figure 3In some embodiments, the heat sink 10, quick-release assembly 20, and heating assembly 30 are arranged sequentially along a first direction A. A connecting portion 11 protrudes from one side of the heat sink 10 along the first direction A. Along the second direction B, the thickness of the connecting portion 11 is less than the thickness of the heat sink 12. The mounting base 21 and the connecting portion 11 are arranged opposite each other along the second direction B, which can fully utilize the bottom space of the heat sink 10, improve the overall structural compactness, and facilitate alignment of the heating assembly 30 with the discharge end of the heat sink 10. The first part 211 and the second part 212 of the mounting base 21 can also be arranged opposite each other along the second direction B. A locking member 22 passes through the mounting base 21 along the second direction B and connects to the connecting portion 11, thereby tightening the free ends of the first part 211 and the second part 212 on the mounting base 21 while fixing the mounting base 21 to the connecting portion 11.

[0033] In other embodiments, the connecting portion 11 may extend laterally along the second direction B, and the mounting base 21 and the connecting portion 11 are disposed opposite each other along the first direction A. The first part 211 and the second part 212 of the mounting base 21 are distributed along the first direction A, and the locking member 22 may also lock the mounting base 21 and the connecting portion 11 along the first direction A. In this case, a protrusion structure may be provided on the upper side of the heating block 31, and the protrusion structure is sandwiched between the first part 211 and the second part 212 to realize the assembly and positioning of the hot end structure 100.

[0034] In the embodiments of this application, the first direction A and the second direction B are set approximately perpendicularly, and any perpendicularity error within the range of 2° can be considered perpendicular.

[0035] In some embodiments, the locking member 22 includes a supporting portion 221 and a locking portion 222 connected together. The supporting portion 221 is disposed on the side of the first portion 211 opposite to the second portion 212, and the locking portion 222 passes through the first portion 211, the second portion 212, and the connecting portion 11. Specifically, the locking portion 222 is generally cylindrical in shape, and the supporting portion 221 may be a flange structure located at the end of the locking portion 222. The outer surface of the locking portion 222 may be provided with a threaded structure to be threadedly connected to the mounting base 21 and the connecting portion 11. When the locking portion 222 is locked with the mounting base 21 and the connecting portion 11, the supporting portion 221 may abut against the outside of the first portion 211, tightening the first portion 211 and the second portion 212 to achieve clamping and positioning of the heating block 31.

[0036] In some embodiments, the connecting portion 11 is further provided with a positioning protrusion 113 on the side facing the mounting base 21. The positioning protrusion 113 abuts against the side of the mounting base 21 facing the heat sink 10, and the positioning protrusion 113 is spaced apart from the heat sink 10. In this way, the mounting base 21 and the heat sink 10 can be spaced apart, reducing the problem of heat generated by the heating block 31 being transferred to the heat sink 10 through the mounting base 21 and affecting the heat dissipation effect.

[0037] Please continue reading. Figure 4 and Figure 5 In some embodiments, the first portion 211 of the mounting base 21 includes a first segment 2111, a second segment 2112, and a third segment 2113, and the second portion 212 includes a fourth segment 2121, a fifth segment 2122, and a sixth segment 2123. The first segment 2111 connects to the fourth segment 2121, a mating groove 213 is provided between the second segment 2112 and the fifth segment 2122, and an adjusting gap 214 is provided between the third segment 2113 and the sixth segment 2123, the adjusting gap 214 communicating with the mating groove 213. The heating block 31 is partially clamped in the mating groove 213. The locking member 22 includes a first locking member 223 and a second locking member 224. The first locking member 223 passes through the first section 2111, the fourth section 2121 and the connecting part 11, and the second locking member 224 passes through the third section 2113, the adjusting gap 214, the sixth section 2123 and the connecting part 11.

[0038] In the embodiments of this application, the first segment 2111, the second segment 2112, and the third segment 2113 can be connected as a single unit and arranged sequentially along the third direction C. The fourth segment 2121, the fifth segment 2122, and the sixth segment 2123 can also be connected as a single unit and arranged sequentially along the third direction C. The third direction C is perpendicular to the first direction A and the second direction B. In other embodiments, the first segment 2111, the second segment 2112, and the third segment 2113 can also be configured as separate structures, connected directly or indirectly; the fourth segment 2121, the fifth segment 2122, and the sixth segment 2123 can also be configured as separate structures, connected directly or indirectly.

[0039] In the embodiments of this application, the first segment 2111 can be connected to the fourth segment 2121 as a whole, that is, the first part 211 and the second part 212 are an integral structure, which is beneficial to providing structural reliability of the mounting base 21. In other embodiments, the first segment 2111 and the fourth segment 2121 can also be set as a separate structure and fixedly connected by welding, bolt locking or other methods, and this application is not limited to this.

[0040] In the embodiments of this application, the mating groove 213 is generally circular, and the heating block 31 is also generally cylindrical. In other embodiments, the mating groove 213 can also be set as a rectangular, polygonal, or other structure, as long as it matches the shape of the heating block 31, and this application is not limited to this.

[0041] By adjusting the gap 214, when the second locking member 224 is locked with the connecting part 11, the distance between the supporting part 221 and the connecting part 11 can be adjusted to press or loosen the third section 2113, so that the third section 2113 and the sixth section 2123 can generate a certain range of relative displacement under the condition that it does not exceed the elastic deformation range of the mounting base 21, thereby adjusting the diameter of the mating groove 213 and clamping or loosening the heating block 31.

[0042] In some embodiments, the second portion 212 is further provided with a second protrusion 217 on the side facing the connecting portion 11, and the two second protrusions 217 are respectively provided with corresponding first locking member 223 and second locking member 224. A second recess 219 is formed between the two second protrusions 217. The connecting portion 11 may also include a protrusion structure corresponding to the two second protrusions 217. The first locking member 223 and the second locking member 224 respectively connect the two second protrusions 217 to the corresponding protrusion structure. This can reduce the contact area between the mounting base 21 and the connecting portion 11, and further reduce the heat transfer to the heat sink 10 through the mounting base 21.

[0043] Please see Figure 6 , Figure 7 and Figure 8 In some embodiments, the connecting portion 11 includes a first connecting portion 111 and a second connecting portion 112 disposed opposite to and spaced apart from each other. A mounting base 21 is disposed between the first connecting portion 111 and the second connecting portion 112. A locking member 22 is disposed through the first connecting portion 111, the first portion 211, the second portion 212, and the second connecting portion 112. Specifically, the abutting portion 221 of the locking member 22 can abut against the outside of the first connecting portion 111. The locking portion 222 sequentially passes through the first connecting portion 111, the first portion 211, the second portion 212, and the second connecting portion 112, achieving a detachable locking mechanism. Thus, the locking member 22 can indirectly clamp the first portion 211 and the second portion 212 by tightening the first connecting portion 111 and the second connecting portion 112, thereby clamping the positioning heating block 31, which helps improve the reliability of the structure and enhances printing quality.

[0044] In some embodiments, the heat sink 10 further includes a top plate 13, a first side plate 14, and a second side plate 15. The first side plate 14 and the second side plate 15 are connected to opposite sides of the top plate 13. A heat dissipation portion 12 is connected to the top plate 13 and is spaced between the first side plate 14 and the second side plate 15. A first connecting portion 111 is located on the side of the first side plate 14 away from the top plate 13, and a second connecting portion 112 is located on the side of the second side plate 15 away from the top plate 13. In this way, the connecting portion 11 can maintain a sufficient distance from the heat dissipation portion 12, further reducing heat transfer issues.

[0045] In other embodiments, the first connecting portion 111 and the second connecting portion 112 may also be directly protruding from the bottom of the heat dissipation portion 12 (e.g., Figures 1 to 3 As shown in the figure, the mounting is arranged at intervals along the second direction B to reserve installation space for the mounting base 21. This application is not limited to this.

[0046] Further, please refer to Figures 6 to 8 The first connecting part 111 and the second connecting part 112 are provided with positioning protrusions 113 on their opposite sides, which respectively abut against the first part 211 and the second part 212 along the first direction A, so that the mounting base 21 and the heat dissipation part 12 are spaced apart, further reducing heat transfer.

[0047] Figures 6 to 8 In the illustrated embodiment, the first part 211 of the mounting base 21 may also include a first segment 2111, a second segment 2112, and a third segment 2113, and the second part 212 of the mounting base 21 may also include a fourth segment 2121, a fifth segment 2122, and a sixth segment 2123. The correspondence between the segments is roughly the same as in the aforementioned embodiment, and will not be repeated here. The first locking member 223 passes through the first connecting part 111, the first segment 2111, the fourth segment 2121, and the second connecting part 112, and the second locking member 224 passes through the first connecting part 111, the third segment 2113, the adjusting gap 214, the sixth segment 2123, and the second connecting part 112. The locking and quick-release methods are similar to those described above, and will not be repeated here.

[0048] In some embodiments, an expansion gap 215 is provided between the first section 2111 and the fourth section 2121. The expansion gap 215 communicates with the mating groove 213 and is disposed opposite to the adjustment gap 214. This helps to increase the elastic deformation of the mounting base 21, adapt to heating blocks 31 of different sizes, and improve the versatility of the structure.

[0049] Furthermore, along the third direction C, the length of the expansion gap 215 is less than the length of the adjustment gap 214. The expansion gap 215 does not communicate with the mounting hole of the first locking member 223 on the mounting base 21. That is, when the first locking member 223 passes through the first section 2111 and the fourth section 2121, it does not pass through the expansion gap 215, and the expansion gap 215 is adjacent to the mounting hole of the first locking member 223. In this way, the connection area between the first section 2111 and the fourth section 2121 can retain a certain thickness to ensure the structural strength of the mounting base 21.

[0050] In some embodiments, the first portion 211 has two first protrusions 216 on the side facing the first connecting portion 111, corresponding to the first section 2111 and the third section 2113, respectively. The second portion 212 has two second protrusions 217 on the side facing the second connecting portion 112, corresponding to the fourth section 2121 and the sixth section 2123, respectively. The first locking member 223 and the second locking member 224 also pass through the corresponding first protrusions 216 and second protrusions 217, respectively. This helps to improve the connection reliability between the connecting portion 11, the mounting base 21, and the locking member 22. A first recess 218 is formed between the two first protrusions 216, and a second recess 219 is formed between the two second protrusions 217. This reduces the contact area between the first connecting portion 111 and the first portion 211, and between the second connecting portion 112 and the second portion 212, further reducing heat transfer issues.

[0051] Please refer to it again. Figures 1 to 8 The heating block 31 is generally a cylindrical structure. The heating element 32 is sleeved on the outer surface of the heating block 31, with the heating element 32 protruding from the end of the heating block 31 facing the heat sink 10. The end of the heating block 31 protruding from the heat sink 10 is clamped and positioned in the mounting base 21. Along the radial direction of the heating block 31, the end of the heating block 31 away from the heat sink 10 protrudes from the outer peripheral surface of the heating element 32. In this way, the bottom of the heating block 31 can support the heating element 32 and position the heating element 32.

[0052] Furthermore, the heating assembly 30 also includes a thermistor 33, which is connected to the heating element 32 and is used to control the heating temperature.

[0053] In some embodiments, the hot end structure 100 further includes a nozzle assembly 40, which is partially disposed within the heating block 31. The nozzle assembly 40 includes a nozzle 41, a heat-conducting pipe, and a feed pipe 43. The heat-conducting pipe is connected between the nozzle 41 and the feed pipe 43. The heat-conducting pipe is disposed within the heating block 31 to absorb heat transferred from the heating block 31 and melt the material. The nozzle 41 protrudes from the end of the heating block 31 away from the heat sink 10 and is used to output the molten material for 3D printing. The feed pipe 43 extends from the end of the heating block 31 toward the heat sink 10 and is disposed within the heat sink 10 along a first direction A for guiding and transporting the material.

[0054] Please refer to it again. Figures 1 to 8 The embodiments of this application also provide a nozzle mechanism 1000, including an extrusion assembly 50 and a hot end structure 100 as described in the above embodiments, wherein the hot end structure 100 is assembled at the discharge end of the extrusion assembly 50.

[0055] Please see Figure 9The embodiments of this application also provide a 3D printing device, including a printing body 60 and a nozzle mechanism 1000 as described in the above embodiments, wherein the nozzle mechanism 1000 is assembled on the printing body 60.

[0056] In some embodiments, the printing body 60 includes a forming platform 62, a drive assembly 63, and a frame 61. The forming platform 62 and the drive assembly 63 are respectively connected to the frame 61. The nozzle mechanism 1000 is connected to the drive assembly 63. The drive assembly 63 can drive the nozzle mechanism 1000 to move relative to the forming platform 62 for 3D printing.

[0057] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A hot end structure, characterized by, include: A heat sink includes a heat dissipation part and a connecting part, wherein the connecting part is disposed on one side of the heat sink; A quick-release assembly includes a mounting base and a locking member. The connecting portion is disposed opposite to the mounting base. The mounting base includes a first part and a second part. One end of the first part is connected to the second part, and the other end of the first part is spaced apart from the second part. The locking member detachably connects the first part, the second part, and the connecting portion. A heating assembly includes a heating block and a heating element, wherein the heating block is partially sandwiched between a first part and a second part, and the heating element is disposed on the outer surface of the heating block.

2. The hot-end structure according to claim 1, characterized in that: The locking member includes a supporting part and a locking part connected to each other. The supporting part is located on the side of the first part away from the second part, and the locking part passes through the first part, the second part and the connecting part.

3. The hot-end structure according to claim 1, characterized in that: The connecting portion includes a first connecting portion and a second connecting portion that are disposed opposite to and spaced apart from each other. The mounting seat is disposed between the first connecting portion and the second connecting portion. The locking member is disposed through the first connecting portion, the first part, the second part and the second connecting portion.

4. The hot-end structure according to claim 3, characterized in that: The heat sink also includes a top plate, a first side plate, and a second side plate. The first side plate and the second side plate are connected to opposite sides of the top plate. The heat sink is connected to the top plate and is spaced between the first side plate and the second side plate. The first connecting part is located on the side of the first side plate away from the top plate, and the second connecting part is located on the side of the second side plate away from the top plate.

5. The hot-end structure according to claim 1, characterized in that: The connecting part is provided with a positioning protrusion on the side facing the mounting base. The positioning protrusion abuts against the side of the mounting base facing the heat sink, and the positioning protrusion is spaced apart from the heat sink.

6. The hot-end structure according to claim 1, characterized in that: The first part includes a first section, a second section, and a third section; the second part includes a fourth section, a fifth section, and a sixth section; the first section connects to the fourth section; a mating groove is provided between the second section and the fifth section; an adjustment gap is provided between the third section and the sixth section; the adjustment gap communicates with the mating groove; the heating block is partially clamped in the mating groove. The locking components include a first locking component and a second locking component. The first locking component passes through the first section, the fourth section, and the connecting portion. The second locking component passes through the third section, the adjusting gap, the sixth section, and the connecting portion.

7. The hot-end structure according to claim 6, characterized in that: An expansion gap is provided between the first section and the fourth section. The expansion gap communicates with the mating groove and is positioned opposite to the adjustment gap.

8. The hot-end structure according to claim 1, characterized in that: The hot end structure also includes a nozzle assembly, which is partially inserted into the heating block.

9. A showerhead mechanism, comprising: include: Extruded components; and, The hot end structure according to any one of claims 1-8, wherein the hot end structure is assembled at the discharge end of the extrusion assembly.

10. A 3D printing device, characterized by include: Print body; and, The printhead mechanism of claim 9, wherein the printhead mechanism is assembled to the printing body.

Images