The extrusion mechanism of a 3D printer

Abstract

The present invention relates to the technical field of 3D printing, and particularly to an extrusion mechanism of a 3D printer, which includes a bracket. An extrusion support structure is provided on the bracket, and a printing extrusion head is fixedly connected to the extrusion support structure. A support ring is fixedly connected to the bottom of the extrusion support structure, and the support ring is sleeved outside the printing extrusion head. A position adjustment mechanism for adjusting the position of the support ring is provided on the bracket. An annular protective shell is provided below the support ring, and the annular protective shell and the support ring are connected through a rotating member. A gear ring is provided inside the annular protective shell, and the gear ring and the support ring are connected through a first connecting plate. At least one first gear meshing with the gear ring is provided inside the annular protective shell; the inclination angle of the printing extrusion head can be changed so that the detachable heat dissipation unit can dissipate heat from different positions on the printing extrusion head. At the same time, the detachable heat dissipation unit can cool the model printed by the printing extrusion head, improving the heat dissipation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and particularly to an extrusion mechanism of a 3D printer. Background Art

[0002] 3D printing is a rapid prototyping technology. During the use of a 3D printer, it is necessary to dissipate heat from the printing extrusion head in a timely manner to prevent overheating at the printing extrusion head, which may cause deformation or even damage, thereby affecting the printing accuracy and the quality of the filament output. In the prior art, the Chinese patent with the publication number CN218054009U discloses an extrusion mechanism and a 3D printer. When the position or length dimension of the nozzle changes and it is necessary to adjust the air outlet direction of the fan to better dissipate heat from the nozzle, at this time, the mounting member is rotated relative to the extrusion nozzle to change the air outlet direction of the fan, so that the air outlet direction of the fan can blow more precisely towards the nozzle. However, the fan can only blow air in one direction, which is not convenient for dissipating heat from different positions on the printing extrusion head, and there are certain limitations. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide an extrusion mechanism of a 3D printer to solve the problem that it is not convenient to dissipate heat from different positions on the printing extrusion head.

[0004] Based on the above purpose, the present invention provides an extrusion mechanism of a 3D printer, including a bracket. An extrusion support structure is provided on the bracket. A printing extrusion head is fixedly connected to the extrusion support structure. A support ring is fixedly connected to the bottom of the extrusion support structure and sleeved outside the printing extrusion head. A position adjustment mechanism for adjusting the position of the support ring is provided on the bracket. A circular protective shell is provided below the support ring. The circular protective shell and the support ring are connected by a rotating member. A toothed ring is provided inside the circular protective shell. The toothed ring and the support ring are connected by a first connecting plate. At least one first gear meshing with the toothed ring is provided inside the circular protective shell. A fixedly connected first connecting shaft penetrates through the first gear. The top end of the first connecting shaft is connected to the circular protective shell through a bearing, and the bottom end of the first connecting shaft is fixedly connected to a first friction disc;

[0005] A second friction disc is provided at the bottom of the first friction disc. A second connecting shaft is fixedly connected to the bottom of the second friction disc. A first movable plate is sleeved outside the second connecting shaft. A bearing is provided at the connection between the second connecting shaft and the first movable plate. The top of the second friction disc is in contact with the bottom of the first friction disc. The first movable plate and the circular protective shell are connected by a lifter. A second gear meshing with the toothed ring is provided inside the circular protective shell. A driving member for driving the second gear to rotate is provided on the circular protective shell. A rotating shaft is provided below the second connecting shaft. The rotating shaft is rotatably connected to the circular protective shell. The rotating shaft and the second connecting shaft are connected by a swing meshing structure. A detachable heat dissipation unit is provided on the rotating shaft.

[0006] Optionally, the swinging engagement structure includes a turntable fixedly installed at the bottom end of the second connecting shaft. A fixing column is fixedly connected to the bottom of the turntable. A third gear is fixedly sleeved outside the rotating shaft. A second movable plate is arranged above the third gear. A first toothed plate meshing with the third gear is fixedly connected to the bottom of the second movable plate. A chute is formed on the second movable plate. The fixing column is located in the chute. The second movable plate and the annular protective shell are connected through a guiding unit.

[0007] Optionally, the guiding unit includes side plates arranged on one side of the second movable plate. Two guiding columns are fixedly connected to the side plates. The guiding columns penetrate through the second movable plate, and one end of the guiding columns is fixedly connected to the inner wall of the annular protective shell.

[0008] Optionally, a first supporting part is arranged below the third gear. The first supporting part and the annular protective shell are connected through a first hydraulic telescopic rod. A second toothed plate cooperating with the third gear is fixedly connected to the first supporting part.

[0009] When the detachable heat dissipation unit needs to maintain a fixed inclination angle, the first hydraulic telescopic rod drives the first supporting part and the second toothed plate to move. The second toothed plate meshes with the third gear. As the second toothed plate continuously moves, the second toothed plate drives the third gear and the rotating shaft to rotate, so that the detachable heat dissipation unit maintains a fixed preset inclination angle. When the first connecting shaft and the first friction disc rotate, the second friction disc and the second connecting shaft remain stationary. The inclination angle of the detachable heat dissipation unit can be individually controlled according to actual needs.

[0010] Optionally, the lifter includes a movable ring arranged inside the annular protective shell. One end of the first movable plate is fixedly connected to the movable ring. The movable ring and the top inner wall of the annular protective shell are connected through a second hydraulic telescopic rod.

[0011] Optionally, the rotating member includes a fixed ring arranged below the support ring. A rotating ring is sleeved outside the fixed ring. The fixed ring and the rotating ring are connected through a bearing. The rotating ring and the annular protective shell are connected through a connecting column. The fixed ring and the support ring are connected through a second connecting plate. Both ends of the rotating shaft are respectively sleeved with second supporting parts. A bearing is arranged at the connection between the rotating shaft and the second supporting parts. One end of the second supporting part is fixedly connected to the inner wall of the annular protective shell. Through the design of the second supporting part and the bearing, the rotating shaft is rotationally connected to the annular protective shell.

[0012] Optionally, the detachable heat dissipation unit includes a fixed block arranged below the rotating shaft. The fixed block and the rotating shaft are connected through a third connecting plate. A turbo fan is arranged at the bottom of the fixed block. The air outlet of the turbo fan faces downward. The turbo fan and the fixed block are connected through a detachable member.

[0013] Optionally, the dismountable part includes an insertion block fixedly installed on the top of the turbo fan. A slot is formed at the bottom of the fixed block. The insertion block is located within the slot. A limiting hole is formed in one inner wall of the slot. A groove is formed on the insertion block. A limiting block is arranged within the groove. One end of the limiting block and one inner wall of the groove are connected through a compression spring. The other end of the limiting block is located within the limiting hole.

[0014] Optionally, the driving part includes a mounting plate arranged within the annular protective housing. The mounting plate and the annular protective housing are connected through bolts. A motor is fixedly connected to the mounting plate. The output end of the motor is fixedly connected to a fixed disk. A clamping slot is formed on the fixed disk. A prism is arranged within the clamping slot. The top end of the prism is fixedly connected to a third connecting shaft. The third connecting shaft penetrates through the second gear and is fixedly connected to the second gear. The top end of the third connecting shaft and the annular protective housing are connected through a bearing.

[0015] Optionally, a heat dissipation fan is fixedly connected to the support ring. Two flow guiding plates are fixedly connected to one side of the heat dissipation fan, and the two flow guiding plates are respectively located on both sides of the printing extrusion head.

[0016] Beneficial effects of the present invention: When the printing extrusion head performs an extrusion operation, the driving part drives the second gear to rotate, so that the second gear rolls on the toothed ring, and further enables the annular protective housing to rotate relative to the support ring, changing the position of the dismountable heat dissipation unit. When the annular protective housing rotates relative to the support ring, the first gear rolls on the toothed ring. The first gear drives the first connecting shaft and the first friction disk to rotate. The first friction disk drives the second connecting shaft to rotate through the second friction disk. The second connecting shaft drives the rotating shaft to periodically rotate forward and backward through the swing engagement structure, so that the rotating shaft drives the dismountable heat dissipation unit to swing, changing the inclination angle of the dismountable heat dissipation unit. While the dismountable heat dissipation unit rotates around the printing extrusion head, the inclination angle of the printing extrusion head can be changed, so that the dismountable heat dissipation unit dissipates heat from different positions on the printing extrusion head. At the same time, the dismountable heat dissipation unit can cool the model printed by the printing extrusion head, improving the heat dissipation efficiency. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only those of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of the support ring of an embodiment of the present invention;

[0020] Figure 3 Schematic structural diagram of the annular protective shell according to an embodiment of the present invention;

[0021] Figure 4 Schematic structural diagram of the cut-open annular protective shell according to an embodiment of the present invention;

[0022] Figure 5 Schematic structural diagram of the movable ring according to an embodiment of the present invention;

[0023] Figure 6 Schematic structural diagram of the second connecting shaft according to an embodiment of the present invention;

[0024] Figure 7 Schematic structural diagram of the dismountable heat dissipation unit according to an embodiment of the present invention;

[0025] Figure 8 Schematic structural diagram of the separated insertion block and fixing block according to an embodiment of the present invention;

[0026] Figure 9 Schematic structural diagram of the mounting plate according to an embodiment of the present invention.

[0027] The markings in the figure are:

[0028] 1, bracket; 2, extrusion support structure; 3, support ring; 4, printing extrusion head; 5, annular protective shell; 6, gear ring; 7, first connecting plate; 8, first gear; 9, first connecting shaft; 10, first friction disc; 11, second friction disc; 12, second connecting shaft; 13, first movable plate; 14, second gear; 15, rotating shaft; 16, turntable; 17, fixed column; 18, second movable plate; 19, chute; 20, first toothed plate; 21, third gear; 22, second toothed plate; 23, first support portion; 24, first hydraulic expansion rod; 25, side plate; 26, guiding column; 27, movable ring; 28, second hydraulic expansion rod; 29, rotating ring; 30, connecting column; 31, fixed ring; 32, second connecting plate; 33, fixing block; 34, third connecting plate; 35, turbine fan; 36, insertion block; 37, slot; 38, limiting hole; 39, limiting block; 40, groove; 41, compression spring; 42, third connecting shaft; 43, prism; 44, motor; 45, fixed disc; 46, card slot; 47, mounting plate; 48, bolt; 49, heat dissipation fan; 50, flow guiding plate; 51, second support portion. Detailed implementation manners

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments.

[0030] An extrusion mechanism of a 3D printer proposed in this specification, as Figures 1 to 9As shown in the figure, it includes a bracket 1. An extrusion support structure 2 is provided on the bracket 1. A printing extrusion head 4 is fixedly connected to the extrusion support structure 2. A support ring 3 is fixedly connected to the bottom of the extrusion support structure 2, and the support ring 3 is sleeved outside the printing extrusion head 4. A position adjustment mechanism for adjusting the position of the support ring 3 is provided on the bracket 1. Through the position adjustment mechanism, the positions of the extrusion support structure 2 and the printing extrusion head 4 can be adjusted. Below the support ring 3 is provided an annular protective shell 5. The annular protective shell 5 and the support ring 3 are connected by a rotating member. A gear ring 6 is provided inside the annular protective shell 5. The gear ring 6 and the support ring 3 are connected by a first connecting plate 7. At least one first gear 8 meshing with the gear ring 6 is provided inside the annular protective shell 5. A fixedly connected first connecting shaft 9 penetrates through the first gear 8. The top end of the first connecting shaft 9 and the annular protective shell 5 are connected by a bearing. A first friction disk 10 is fixedly connected to the bottom end of the first connecting shaft 9;

[0031] A second friction disk 11 is provided at the bottom of the first friction disk 10. A second connecting shaft 12 is fixedly connected to the bottom of the second friction disk 11. A first movable plate 13 is sleeved outside the second connecting shaft 12. A bearing is provided at the connection between the second connecting shaft 12 and the first movable plate 13. The top of the second friction disk 11 is in contact with the bottom of the first friction disk 10. The first movable plate 13 and the annular protective shell 5 are connected by a lifter. A second gear 14 meshing with the gear ring 6 is provided inside the annular protective shell 5. A driving member for driving the second gear 14 to rotate is provided on the annular protective shell 5. Below the second connecting shaft 12 is provided a rotating shaft 15. The rotating shaft 15 and the annular protective shell 5 are rotatably connected. The rotating shaft 15 and the second connecting shaft 12 are connected by a swinging meshing structure. A detachable heat dissipation unit is provided on the rotating shaft 15; Through the design of the rotating member, the annular protective shell 5 is rotatably connected relative to the support ring 3. When the printing extrusion head 4 performs extrusion work, the driving member drives the second gear 14 to rotate, so that the second gear 14 rolls on the gear ring 6, and then the annular protective shell 5 rotates relative to the support ring 3, changing the position of the detachable heat dissipation unit. When the annular protective shell 5 rotates relative to the support ring 3, the first gear 8 rolls on the gear ring 6. The first gear 8 drives the first connecting shaft 9 and the first friction disk 10 to rotate. The first friction disk 10 drives the second connecting shaft 12 to rotate through the second friction disk 11. The second connecting shaft 12 drives the rotating shaft 15 to periodically rotate forward and backward through the swinging meshing structure, so that the rotating shaft 15 drives the detachable heat dissipation unit to swing, changing the inclination angle of the detachable heat dissipation unit. While the detachable heat dissipation unit rotates around the printing extrusion head 4, the inclination angle of the printing extrusion head 4 can be changed, so that the detachable heat dissipation unit dissipates heat from different positions on the printing extrusion head 4. At the same time, the detachable heat dissipation unit can cool the model printed by the printing extrusion head 4, improving the heat dissipation efficiency.

[0032] In some optional specific embodiments, such as Figure 4 、 Figure 5 、Figure 6 and Figure 7 As shown in Figure 7 , the swing engagement structure includes a turntable 16 fixedly installed at the bottom end of the second connecting shaft 12. A fixed column 17 is fixedly connected to the bottom of the turntable 16. A third gear 21 is fixedly sleeved outside the rotating shaft 15. Above the third gear 21, there is a second movable plate 18. A first toothed plate 20 meshing with the third gear 21 is fixedly connected to the bottom of the second movable plate 18. A chute 19 is formed on the second movable plate 18. The fixed column 17 is located in the chute 19. The second movable plate 18 and the annular protective shell 5 are connected through a guiding unit. The guiding unit includes a side plate 25 arranged on one side of the second movable plate 18. Two guiding columns 26 are fixedly connected to the side plate 25. The guiding columns 26 penetrate through the second movable plate 18, and one end of the guiding column 26 is fixedly connected to the inner wall of the annular protective shell 5. Below the third gear 21, there is a first supporting portion 23. The first supporting portion 23 and the annular protective shell 5 are connected through a first hydraulic telescopic rod 24. A second toothed plate 22 cooperating with the third gear 21 is fixedly connected to the first supporting portion 23. The lifter includes a movable ring 27 arranged in the annular protective shell 5. One end of the first movable plate 13 is fixedly connected to the movable ring 27. The movable ring 27 and the top inner wall of the annular protective shell 5 are connected through a second hydraulic telescopic rod 28. When the second connecting shaft 12 rotates, the second connecting shaft 12 drives the turntable 16 and the fixed column 17 to rotate. The fixed column 17 slides in the chute 19, so that the second movable plate 18 reciprocates horizontally. The second movable plate 18 drives the third gear 21 to periodically rotate forward and backward through the first toothed plate 20. The third gear 21 drives the detachable heat dissipation unit to swing through the rotating shaft 15. Through the design of the side plate 25 and the guiding columns 26, the second movable plate 18 slides smoothly relative to the annular protective shell 5. The second hydraulic telescopic rod 28 drives the movable ring 27 to move vertically. The first movable plate 13 drives the second connecting shaft 12 and the second friction disc 11 to move vertically, so that the second friction disc 11 and the first friction disc 10 are in close contact, and the force of the second friction disc 11 pressing on the first friction disc 10 can be controlled, thereby adjusting the friction force between the first friction disc 10 and the second friction disc 11. When it is necessary for the detachable heat dissipation unit to maintain a fixed inclination angle, the first hydraulic telescopic rod 24 drives the first supporting portion 23 and the second toothed plate 22 to move. The second toothed plate 22 meshes with the third gear 21. As the second toothed plate 22 continuously moves, the second toothed plate 22 drives the third gear 21 and the rotating shaft 15 to rotate, so that the detachable heat dissipation unit maintains a fixed preset inclination angle. When the first connecting shaft 9 and the first friction disc 10 rotate, the second friction disc 11 and the second connecting shaft 12 remain stationary, and the inclination angle of the detachable heat dissipation unit can be individually controlled according to actual needs.

[0033] In some optional specific embodiments, such as Figure 3 、 Figure 4 and Figure 9As shown, the rotating member includes a fixed ring 31 disposed below the support ring 3. A rotating ring 29 is sleeved outside the fixed ring 31. The fixed ring 31 and the rotating ring 29 are connected by a bearing. The rotating ring 29 and the annular protective shell 5 are connected by a connecting column 30. The fixed ring 31 and the support ring 3 are connected by a second connecting plate 32. Both ends of the rotating shaft 15 are respectively sleeved with a second support portion 51. A bearing is provided at the connection between the rotating shaft 15 and the second support portion 51. One end of the second support portion 51 is fixedly connected to the inner wall of the annular protective shell 5. Through the design of the second support portion 51 and the bearing, the rotating shaft 15 and the annular protective shell 5 are rotationally connected; the driving member includes a mounting plate 47 disposed inside the annular protective shell 5. The mounting plate 47 and the annular protective shell 5 are connected by bolts 48. A motor 44 is fixedly connected to the mounting plate 47. The output end of the motor 44 is fixedly connected to a fixed disk 45. A card slot 46 is formed in the fixed disk 45. A prism 43 is provided in the card slot 46. The top end of the prism 43 is fixedly connected to a third connecting shaft 42. The third connecting shaft 42 penetrates through the second gear 14 and is fixedly connected to the second gear 14. The top end of the third connecting shaft 42 is connected to the annular protective shell 5 by a bearing; through the design of the rotating ring 29, the connecting column 30, the fixed ring 31, the second connecting plate 32 and the bearing, the annular protective shell 5 and the rotating ring 29 are rotationally connected relative to the support ring 3. By driving the fixed disk 45 to rotate by the motor 44, the fixed disk 45 drives the second gear 14 to rotate through the prism 43 and the third connecting shaft 42. The staff drives the bolt 48 to rotate so that the bolt 48 disengages from the mounting plate 47 and the annular protective shell 5, releasing the fixed relationship between the mounting plate 47 and the annular protective shell 5. The staff drives the mounting plate 47 and the motor 44 to move downward so that the prism 43 disengages from the card slot 46, and the removal of the motor 44 can be completed.

[0034] In some alternative specific embodiments, such as Figure 2 , Figure 7 and Figure 8As shown in the figure, the dismountable heat dissipation unit includes a fixed block 33 disposed below the rotating shaft 15. The fixed block 33 and the rotating shaft 15 are connected by a third connecting plate 34. A turbo fan 35 is provided at the bottom of the fixed block 33. The blowing port of the turbo fan 35 faces downward. The turbo fan 35 and the fixed block 33 are connected by a dismounting member. The dismounting member includes a plug 36 fixedly installed on the top of the turbo fan 35. A slot 37 is opened at the bottom of the fixed block 33. The plug 36 is located in the slot 37. A limiting hole 38 is opened on one inner wall of the slot 37. A groove 40 is opened on the plug 36. A limiting block 39 is arranged in the groove 40. One end of the limiting block 39 is connected to one inner wall of the groove 40 through a compression spring 41. The other end of the limiting block 39 is located in the limiting hole 38. A heat dissipation fan 49 is fixedly connected to the support ring 3. Two flow guide plates 50 are fixedly connected to one side of the heat dissipation fan 49, and the two flow guide plates 50 are respectively located on both sides of the printing extrusion head 4. When the rotating shaft 15 rotates, the rotating shaft 15 drives the fixed block 33 and the turbo fan 35 to rotate through the third connecting plate 34, changing the inclination angle of the turbo fan 35, thereby adjusting the blowing direction of the turbo fan 35. The staff drives the limiting block 39 to move so that the limiting block 39 disengages from the limiting hole 38, and the compression spring 41 is in a compressed state, releasing the fixed relationship between the plug 36 and the fixed block 33. The staff drives the turbo fan 35 to move downward so that the plug 36 disengages from the slot 37, and the removal of the turbo fan 35 can be completed. The heat dissipation fan 49 is turned on, and the air blown out by the heat dissipation fan 49 is guided by the flow guide plates 50 so that the air blows towards the printing extrusion head 4 to further dissipate heat from the printing extrusion head 4.

[0035] Working principle: Through the design of the rotating part, the annular protective shell 5 is rotatably connected to the support ring 3. When the printing extrusion head 4 performs the extrusion work, the driving part drives the second gear 14 to rotate, so that the second gear 14 rolls on the toothed ring 6, and then the annular protective shell 5 rotates relative to the support ring 3, changing the position of the detachable heat dissipation unit. When the annular protective shell 5 rotates relative to the support ring 3, the first gear 8 rolls on the toothed ring 6, and the first gear 8 drives the first connecting shaft 9 and the first friction disk 10 to rotate. The first friction disk 10 drives the second connecting shaft 12 to rotate through the second friction disk 11. The second connecting shaft 12 drives the rotating shaft 15 to periodically rotate forward and backward through the swing engagement structure, so that the rotating shaft 15 drives the detachable heat dissipation unit to swing, changing the inclination angle of the detachable heat dissipation unit. While the detachable heat dissipation unit rotates around the printing extrusion head 4, the inclination angle of the printing extrusion head 4 can be changed, so that the detachable heat dissipation unit dissipates heat at different positions on the printing extrusion head 4. At the same time, the detachable heat dissipation unit can cool the model printed by the printing extrusion head 4, improving the heat dissipation efficiency; When the second connecting shaft 12 rotates, the second connecting shaft 12 drives the turntable 16 and the fixed column 17 to rotate. The fixed column 17 slides in the chute 19, so that the second movable plate 18 moves reciprocally in the horizontal direction. The second movable plate 18 drives the third gear 21 to periodically rotate forward and backward through the first toothed plate 20. The third gear 21 drives the detachable heat dissipation unit to swing through the rotating shaft 15. Through the design of the side plate 25 and the guide post 26, the second movable plate 18 slides smoothly relative to the annular protective shell 5. The second hydraulic telescopic rod 28 drives the movable ring 27 to move in the vertical direction, and the first movable plate 13 drives the second connecting shaft 12 and the second friction disk 11 to move in the vertical direction, so that the second friction disk 11 and the first friction disk 10 are in close contact, and the force of the second friction disk 11 pressing the first friction disk 10 can be controlled, thereby adjusting the friction force between the first friction disk 10 and the second friction disk 11. When it is necessary for the detachable heat dissipation unit to maintain a fixed inclination angle, the first hydraulic telescopic rod 24 drives the first support part 23 and the second toothed plate 22 to move. The second toothed plate 22 meshes with the third gear 21. As the second toothed plate 22 continues to move, the second toothed plate 22 drives the third gear 21 and the rotating shaft 15 to rotate, so that the detachable heat dissipation unit maintains a fixed preset inclination angle. When the first connecting shaft 9 and the first friction disk 10 rotate, the second friction disk 11 and the second connecting shaft 12 remain stationary, and the inclination angle of the detachable heat dissipation unit can be controlled individually according to actual needs;Through the design of the rotating ring 29, connecting column 30, fixed ring 31, second connecting plate 32 and bearing, the annular protective shell 5 and the rotating ring 29 are rotationally connected relative to the support ring 3. The fixed disk 45 is driven to rotate by the motor 44. The fixed disk 45 drives the second gear 14 to rotate through the prism 43 and the third connecting shaft 42. The staff drives the bolt 48 to rotate so that the bolt 48 disengages from the mounting plate 47 and the annular protective shell 5, and the fixing relationship between the mounting plate 47 and the annular protective shell 5 is released. The staff drives the mounting plate 47 and the motor 44 to move downward so that the prism 43 disengages from the card slot 46, and the removal of the motor 44 can be completed. When the rotating shaft 15 rotates, the rotating shaft 15 drives the fixed block 33 and the turbine fan 35 to rotate through the third connecting plate 34, changing the inclination angle of the turbine fan 35, and thus adjusting the blowing direction of the turbine fan 35. The staff drives the limiting block 39 to move so that the limiting block 39 disengages from the limiting hole 38, and the compression spring 41 is in a compressed state, releasing the fixing relationship between the insertion block 36 and the fixed block 33. The staff drives the turbine fan 35 to move downward so that the insertion block 36 disengages from the insertion slot 37, and the removal of the turbine fan 35 can be completed. The cooling fan 49 is turned on, and the air blown out by the cooling fan 49 is guided by the guide plate 50 so that the air blows towards the printing extruder head 4 to further dissipate heat from the printing extruder head 4.;

[0036] Those of ordinary skill in the art should understand that the discussion of any embodiment above is only exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0037] The present invention aims to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An extrusion mechanism of a 3D printer, comprising a bracket (1), an extrusion support structure (2) is provided on the bracket (1), a printing extrusion head (4) is fixedly connected to the extrusion support structure (2), a support ring (3) is fixedly connected to the bottom of the extrusion support structure (2), and the support ring (3) is sleeved outside the printing extrusion head (4). A position adjustment mechanism for adjusting the position of the support ring (3) is provided on the bracket (1), and it is characterized in that, Below the said support ring (3) is provided with an annular protective shell (5). The annular protective shell (5) and the support ring (3) are connected by a rotating member. Inside the annular protective shell (5) is provided with a toothed ring (6). The toothed ring (6) and the support ring (3) are connected by a first connecting plate (7). Inside the annular protective shell (5) is provided with at least one first gear (8) meshing with the toothed ring (6). A fixedly connected first connecting shaft (9) penetrates through the first gear (8). The top end of the first connecting shaft (9) and the annular protective shell (5) are connected by a bearing. The bottom end of the first connecting shaft (9) is fixedly connected with a first friction disk (10). Below the first friction disk (10) is provided with a second friction disk (11). The bottom of the second friction disk (11) is fixedly connected with a second connecting shaft (12). The outside of the second connecting shaft (12) is sleeved with a first movable plate (13). A bearing is provided at the connection between the second connecting shaft (12) and the first movable plate (13). The top of the second friction disk (11) is in contact with the bottom of the first friction disk (10). The first movable plate (13) and the annular protective shell (5) are connected by a lifter. Inside the annular protective shell (5) is provided with a second gear (14) meshing with the toothed ring (6). On the annular protective shell (5) is provided with a driving member for driving the second gear (14) to rotate. Below the second connecting shaft (12) is provided with a rotating shaft (15). The rotating shaft (15) and the annular protective shell (5) are rotatably connected. The rotating shaft (15) and the second connecting shaft (12) are connected by a swing meshing structure. On the rotating shaft (15) is provided with a dismountable heat dissipation unit. The said swing meshing structure includes a turntable (16) fixedly installed at the bottom end of the second connecting shaft (12). The bottom of the turntable (16) is fixedly connected with a fixed column (17). The outside of the rotating shaft (15) is fixedly sleeved with a third gear (21). Above the third gear (21) is provided with a second movable plate (18). The bottom of the second movable plate (18) is fixedly connected with a first toothed plate (20) meshing with the third gear (21). A chute (19) is opened on the second movable plate (18). The fixed column (17) is located inside the chute (19). The second movable plate (18) and the annular protective shell (5) are connected by a guiding unit. The said guiding unit includes a side plate (25) arranged on one side of the second movable plate (18). Two guiding columns (26) are fixedly connected to the side plate (25). The guiding columns (26) penetrate through the second movable plate (18), and one end of the guiding columns (26) is fixedly connected with the inner wall of the annular protective shell (5). Below the third gear (21) is provided with a first supporting part (23). The first supporting part (23) and the annular protective shell (5) are connected by a first hydraulic telescopic rod (24). A second toothed plate (22) cooperating with the third gear (21) is fixedly connected to the first supporting part (23).

2. The extrusion mechanism of the 3D printer according to claim 1, characterized in that, The said lifter includes a movable ring (27) arranged inside the annular protective shell (5). One end of the first movable plate (13) is fixedly connected with the movable ring (27). The movable ring (27) and the top inner wall of the annular protective shell (5) are connected by a second hydraulic telescopic rod (28).

3. The extrusion mechanism of the 3D printer according to claim 1, characterized in that, The rotating member includes a fixed ring (31) disposed below the support ring (3). A rotating ring (29) is sleeved outside the fixed ring (31). The fixed ring (31) and the rotating ring (29) are connected by a bearing. The rotating ring (29) and the annular protective shell (5) are connected by a connecting column (30). The fixed ring (31) and the support ring (3) are connected by a second connecting plate (32). Both ends of the rotating shaft (15) are respectively sleeved with second support parts (51). A bearing is provided at the connection between the rotating shaft (15) and the second support parts (51). One end of the second support parts (51) is fixedly connected to the inner wall of the annular protective shell (5). Through the design of the second support parts (51) and the bearing, the rotating shaft (15) is rotatably connected to the annular protective shell (5).

4. The extrusion mechanism of the 3D printer according to claim 1, characterized in that, The detachable heat dissipation unit includes a fixed block (33) disposed below the rotating shaft (15). The fixed block (33) and the rotating shaft (15) are connected by a third connecting plate (34). A turbo fan (35) is provided at the bottom of the fixed block (33). The air outlet of the turbo fan (35) faces downward. The turbo fan (35) and the fixed block (33) are connected by a detachable member.

5. The extrusion mechanism of the 3D printer according to claim 4, characterized in that, The detachable member includes a plug (36) fixedly installed at the top of the turbo fan (35). A slot (37) is opened at the bottom of the fixed block (33). The plug (36) is located in the slot (37). A limiting hole (38) is opened on one inner wall of the slot (37). A groove (40) is opened on the plug (36). A limiting block (39) is provided in the groove (40). One end of the limiting block (39) is connected to one inner wall of the groove (40) by a compression spring (41). The other end of the limiting block (39) is located in the limiting hole (38).

6. The extrusion mechanism of the 3D printer according to claim 1, characterized in that The driving member includes a mounting plate (47) disposed inside the annular protective shell (5). The mounting plate (47) and the annular protective shell (5) are connected by bolts (48). A motor (44) is fixedly connected to the mounting plate (47). A fixed disk (45) is fixedly connected to the output end of the motor (44). A card slot (46) is opened on the fixed disk (45). A prism (43) is provided in the card slot (46). The top end of the prism (43) is fixedly connected to a third connecting shaft (42). The third connecting shaft (42) penetrates through the second gear (14), and the third connecting shaft (42) is fixedly connected to the second gear (14). The top end of the third connecting shaft (42) is connected to the annular protective shell (5) by a bearing.

7. The extrusion mechanism of the 3D printer according to claim 1, characterized in that, A heat dissipation fan (49) is fixedly connected to the support ring (3). Two flow guiding plates (50) are fixedly connected to one side of the heat dissipation fan (49), and the two flow guiding plates (50) are respectively located on both sides of the printing extrusion head (4).

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