A 3D printing head with dual extrusion system

Abstract

The present application belongs to the field of 3D printing technology, and specifically is a 3D print head of a dual extrusion system, comprising a first feed system, a second feed system, a heating output system, and a nozzle. The output end of the first feed system and the output end of the second feed system are respectively connected to the feed end of the heating output system through a first heat dissipation device and a second heat dissipation device. A nozzle is arranged at the discharge end of the heating output system. The angle between the output direction of the first feed system and the output direction of the second feed system is less than 90 degrees. A third heat dissipation device is arranged at the output port of the nozzle. The present application solves the problem that the print heads of current 3D printers all adopt a single extrusion system of fiber composite consumables, resulting in poor strength of the printed models and failure to meet the demand for high-strength models.

Description

Technical Field

[0001] The present application belongs to the field of 3D printing technology, and specifically relates to a 3D printing head of a dual extrusion system. Background Art

[0002] Fused deposition modeling (FDM) 3D printer has a simple mechanical structure and the lowest manufacturing and maintenance costs. Therefore, FDM is the most widely used 3D printing technology in the world today. However, the print heads of existing 3D printers all use a single extrusion system for fiber composite consumables, which makes the products printed by 3D printers monotonous, resulting in poor strength of the printed models, which cannot meet the needs of high-strength models. Utility Model Content

[0003] The purpose of the present application is to address the shortcomings of the prior art and to design a 3D print head with a dual extrusion system by using a first feed system and a second feed system in combination with a heating output system and a nozzle, wherein the conveying directions of the first feed system and the second feed system are on the same plane, and the angle between the two is less than 90 degrees, so that the present application can combine two fiber composite consumables for 3D printing and ensure the structure of the 3D print head is streamlined, thereby solving the problem that the print heads of current 3D printers all use a single extrusion system for fiber composite consumables, resulting in poor strength of the printed models and failure to meet the demand for high-strength models.

[0004] To achieve the above purpose, the technical solution of the utility model is:

[0005] A 3D print head of a dual extrusion system comprises a first feeding system, a second feeding system, a heating output system, and a nozzle. The output end of the first feeding system and the output end of the second feeding system are respectively connected to the feed end of the heating output system through a first heat dissipation device and a second heat dissipation device. The nozzle is arranged at the discharge end of the heating output system. The angle between the output direction of the first feeding system and the output direction of the second feeding system is less than 90 degrees. A third heat dissipation device is arranged at the output port of the nozzle.

[0006] Preferably, the first heat dissipation device includes a first fan, a heat sink, and a heat pipe. The output end of the first feeding system is coaxially connected to one end of the heat pipe, and the other end of the heat pipe is connected to the feed end of the heating output system. A plurality of heat sinks are radially arranged between the two ends of the heat pipe. The first fan is installed on all the heat sinks, and the air inlet of the first fan faces the heat sink.

[0007] Preferably, the feeding direction of the second heat dissipation device is colinear with the feeding direction of the heating output system.

[0008] Preferably, the second feed system includes a second feed pipe A, a second feed wheel group, and a second feed pipe B. The second feed wheel group is arranged between the second feed pipe A and the second feed pipe B. The second feed pipe A is coaxial with the second feed pipe B. The axis of the second feed wheel group is perpendicular to the axis of the second feed pipe A. The end of the second feed pipe B facing away from the second feed wheel group is connected to the feed end of the second heat dissipation device.

[0009] Preferably, the heating output system includes an electrode heating block, a linear feed cavity, and a feed pipe. The linear feed cavity is arranged in the electrode heating block, the inner diameter of the linear feed cavity is larger than the outer diameter of the feed pipe, one end of the feed pipe is coaxially inserted into the linear feed cavity, and a preset gap is provided between the end of the feed pipe inserted into the linear feed cavity and the end of the linear feed cavity facing away from the feed pipe. The nozzle is arranged on the end of the electrode heating block facing away from the feed pipe, the nozzle is coaxially connected to the end of the linear feed cavity facing away from the feed pipe, the discharge end of the second heat dissipation device is connected to the input end of the feed pipe, the discharge end of the first heat dissipation device is connected to the side wall of the linear feed cavity, and the distance from the output end of the first feed system to the nozzle is greater than the distance from the output end of the feed pipe to the nozzle.

[0010] Preferably, the second heat dissipation device includes a discharge pipe, the output end of the discharge pipe is conical, the discharge pipe is coaxial with the feed pipe, the input end of the discharge pipe is connected to the output end of the second feeding system, the output end of the discharge pipe extends into the feed end of the feed pipe, a preset gap is provided between the output end of the feed pipe and the inner wall of the linear feeding cavity, and a preset gap is provided between the outer wall of the output end of the discharge pipe and the inner wall of the feed of the feed pipe.

[0011] Preferably, the feed end of the feed pipe is funnel-shaped to match the output end of the discharge pipe.

[0012] Preferably, it also includes a back plate, the first feed system, the second feed system, the heating output system, and the nozzle are all arranged on the front side of the back plate, the second feed wheel group includes a second feed wheel A and a second feed wheel B, the second feed wheel A and the second feed wheel B are both rotatably arranged on the front side of the back plate, the second feed motor is fixedly arranged on the back side of the back plate, a second gear A is coaxially provided on the end face of the second feed wheel A, a second gear B is coaxially provided on the end face of the second feed wheel B, the transmission ratios of the second gear A and the second gear B are equal, the second gear A and the second gear B are meshed, and the output shaft of the second feed motor is coaxially fixedly connected to the second gear B.

[0013] Preferably, a second mounting block is provided on the front side of the back plate on one side of the conveying direction of the second feeding system, and a second positioning axis of the back plate is perpendicular to the back plate on the front side of the back plate on the other side of the conveying direction of the second feeding system, the projection of a connecting line segment between the second positioning axis and the second mounting block in the conveying direction of the second feeding system is a line segment with a length, a second screw hole is provided on the second mounting block, the axis of the second screw hole is perpendicular to the conveying direction of the second feeding system, and the axis of the second screw hole is parallel to the back plate, a second connecting rod is rotatably connected to the second positioning axis, a second axial hole is provided between the two ends of the second connecting rod, the second axial hole is sleeved on the axle of the second feeding wheel A, the other end of the second connecting rod is provided with a second through hole coaxial with the second screw hole, the inner diameter of the second through hole is larger than the inner diameter of the second screw hole, and a second bolt passes through the second through hole from the side of the second connecting rod facing away from the second mounting block and is threadedly connected to the second screw hole.

[0014] Preferably, the third heat dissipation device includes an annular air outlet duct, the air outlet end of the second fan is connected to the interior of the annular air outlet duct from the annular outer wall of the annular air outlet duct, an annular air outlet is coaxially provided on the annular inner wall of the annular air outlet duct, and the outlet of the nozzle is located in the ring shape of the annular air outlet duct.

[0015] Preferably, a material cutting device is also provided between the second material conveying pipe B and the feeding end of the second heat dissipation device.

[0016] Preferably, the material cutting device comprises a material cutting shell, a circular cavity, an arc-shaped blade, and a material channel. The material channel and the circular cavity are arranged in the material cutting shell. The material channel is coaxial with the second material conveying pipe B. The circular cavity is arranged between the two ends of the material channel. The axis of the circular cavity is perpendicular to the axis of the material channel. The arc-shaped blade is arranged in the circular cavity. The radius of the virtual circle where the outer arc surface of the arc-shaped blade is located is equal to the radius of the circular cavity. The outer arc surface of the arc-shaped blade is in sliding contact with the inner circumferential surface of the circular cavity. The curvature of the outer arc surface of the arc-shaped blade is less than The projection of the arc-shaped blade on a plane perpendicular to the axis of the material channel surrounds the projection of the material channel on a plane perpendicular to the axis of the material channel. The servo motor is arranged on the back side of the back plate. The output shaft of the servo motor penetrates into the circular cavity and is fixedly connected to the arc-shaped blade. The output shaft of the servo motor is coaxial with the virtual circle where the outer arc surface of the arc-shaped blade is located. One end of the material channel is connected to the output end of the second material conveying pipe B, and the other end of the material channel is connected to the feed end of the second heat dissipation device.

[0017] Preferably, the first feed system includes a first feed pipe A, a first feed wheel group, and a first feed pipe B. The first feed wheel group is arranged between the first feed pipe A and the first feed pipe B. The first feed pipe A is coaxial with the first feed pipe B. The axis of the first feed wheel group is perpendicular to the axis of the first feed pipe A. The end of the first feed pipe B facing away from the first feed wheel group is connected to the feed end of the first heat dissipation device.

[0018] Preferably, the first feed wheel group includes a first feed wheel A and a first feed wheel B, the first feed wheel A and the first feed wheel B are both rotatably arranged on the front side of the back plate, the first feed motor is fixedly arranged on the back side of the back plate, a first gear A is coaxially arranged on the end face of the first feed wheel A, a first gear B is coaxially arranged on the end face of the first feed wheel B, the transmission ratios of the first gear A and the first gear B are equal, the first gear A and the first gear B are meshed, and the output shaft of the first feed motor is coaxially fixedly connected to the first gear B.

[0019] Preferably, a first mounting block is provided on the front side of the back plate on one side of the conveying direction of the first feeding system, and a first positioning axis perpendicular to the back plate is provided on the front side of the back plate on the other side of the conveying direction of the first feeding system, the projection of a connecting line segment between the first positioning axis and the first mounting block in the conveying direction of the first feeding system is a line segment with a length, a first screw hole is provided on the first mounting block, the axis of the first screw hole is perpendicular to the conveying direction of the first feeding system, and the axis of the first screw hole is parallel to the back plate, a first connecting rod is rotatably connected to the first positioning axis, a first axial hole is provided between the two ends of the first connecting rod, the first axial hole is sleeved on the axle of the first feeding wheel A, the other end of the first connecting rod is provided with a first through hole coaxial with the first screw hole, the inner diameter of the first through hole is larger than the inner diameter of the first screw hole, and a first bolt penetrates the first through hole from the side of the first connecting rod facing away from the first mounting block and is threadedly connected to the first screw hole.

[0020] Compared with the prior art, the beneficial effects of this application are:

[0021] 1. The present application adopts a first feeding system and a second feeding system in combination with a heating output system and a nozzle to design a 3D print head with a dual extrusion system, wherein the conveying directions of the first feeding system and the second feeding system are on the same plane, and the angle between the two is less than 90 degrees, so that the present application can combine two fiber composite consumables for 3D printing, and ensure the structure of the 3D print head is streamlined, solving the problem that the print heads of current 3D printers all adopt a single extrusion system for fiber composite consumables, resulting in poor strength of the printed models and failure to meet the demand for high-strength models.

[0022] 2. In the present application, a preset gap is provided between the outer wall of the output end of the discharge pipe and the inner wall of the feed end of the material pipe, so that heat transfer between the feed pipe and the discharge pipe can be avoided without using a heat dissipation device such as a fan. Such a design reduces the use of components, simplifies the overall structure, and reduces the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model;

[0024] Figure 2 yes Figure 1 A partial schematic diagram of the lower middle part;

[0025] Figure 3 It is a structural schematic diagram of the heating output system in this application;

[0026] Figure 4 It is a schematic diagram of the first material delivery system and the second material delivery system in the present application;

[0027] Figure 5 yes Figure 4 The schematic diagram on the right;

[0028] Figure 6 is a schematic diagram of the first feeding system in this application;

[0029] Figure 7 It is a structural schematic diagram of the material interruption device in this application;

[0030] Figure 8 is the schematic diagram at the bottom of this application.

[0031] Among them, 1, back plate; 2, nozzle; 3, first fan; 4, heat sink; 5, heat pipe; 6, second feed pipe A; 7, second feed pipe B; 8, electrode heating block; 9, linear feed cavity; 10, feed pipe; 11, discharge pipe; 12, first bolt; 13, cone; 14, funnel; 15, second feed wheel A; 16, second feed wheel B; 17, second feed motor; 18, second gear A; 19, second gear B; 20, second mounting block; 21, second positioning shaft; 22, second screw hole; 23, second connecting rod; 24, second shaft hole; 25, The second through hole; 26, the second fan; 27, the annular air outlet; 28, the annular air outlet; 29, the cutting pipe; 30, the circular cavity; 31, the arc-shaped blade; 32, the servo motor; 33, the material channel; 34, the first feed pipe A; 35, the first feed pipe B; 36, the first feed wheel A; 37, the first feed wheel B; 38, the first feed motor; 39, the first gear A; 40, the first gear B; 41, the first mounting block; 42, the first positioning shaft; 43, the first screw hole; 44, the first connecting rod; 45, the first shaft hole; 46, the first through hole; 47, the second bolt. DETAILED DESCRIPTION

[0032] like Figure 1-8 As shown, a 3D print head of a dual extrusion system includes a first feeding system, a second feeding system, a heating output system, and a nozzle 2. The output end of the first feeding system and the output end of the second feeding system are respectively connected to the feed end of the heating output system through a first heat dissipation device and a second heat dissipation device, and the nozzle 2 is arranged at the discharge end of the heating output system. The angle between the output direction of the first feeding system and the output direction of the second feeding system is less than 90 degrees, and a third heat dissipation device is arranged at the output port of the nozzle.

[0033] In this embodiment, when in use, first fix the relative positions of the first feed system, the second feed system, the heating output system, and the nozzle 2. For example, the first feed system, the second feed system, the heating output system, and the nozzle 2 can be installed on the front of a back plate 1, so that the first feed system, the second feed system, the heating output system, and the nozzle 2 form a whole, which is convenient for changing the application scene. Of course, it is not limited to the back plate 1, such as a bracket. After that, the back plate 1 is installed on the execution end of the 3D printer, and then the 3D printer conveys a kind of fiber composite consumable through the first feed system, and the second feed system conveys another kind of fiber composite consumable. The two kinds of fiber composite consumables are melted together in the heating output system and flow out of the nozzle 2. The material flowing out of the nozzle 2 is stacked into the shape of the product preset in the 3D printer under the movement of the execution end of the 3D printer; because the first feed system, the second feed system, the heating output system, and the nozzle 2 are all arranged on the front of the back plate 1, the structure of the present application is relatively simple, and the space occupied is relatively small, and it is easy to install. It is also very convenient to disassemble, and you only need to install the back plate 1 on the execution end of the 3D printer; the angle between the output direction of the first feeding system and the output direction of the second feeding system is less than 90 degrees, compared with the case where the angle between the output direction of the first feeding system and the output direction of the second feeding system is 90 degrees, which further ensures the space occupancy of the present application, and the setting of the third heat dissipation device prompts the material after coming out of the nozzle 2 to cool down quickly, thereby avoiding the occurrence of wire drawing; the setting of the first heat dissipation device and the second heat dissipation device is to prevent heat from being transferred to the material source along the fiber composite consumables.

[0034] As a preferred mode, the first heat dissipation device comprises a first fan 3, a heat sink 4, and a heat pipe 5. The output end of the first feeding system is coaxially connected to one end of the heat sink 5, and the other end of the heat sink 5 is connected to the feed end of the heating output system. A plurality of heat sinks 4 are radially arranged between the two ends of the heat sink 5. The first fan 3 is installed on all the heat sinks 4, and the air inlet of the first fan 3 faces the heat sink 4. In this way, the heat dissipation effect is improved by the combination of the first fan 2 and the heat sink 4.

[0035] As a preferred embodiment, the feeding direction of the second heat dissipation device is in line with the feeding direction of the heating output system. Such a design facilitates the transportation of the fiber composite consumables.

[0036] As a preferred embodiment, the second feed system includes a second feed pipe A6, a second feed wheel group, and a second feed pipe B7. The second feed wheel group is arranged between the second feed pipe A6 and the second feed pipe B7. The second feed pipe A6 is coaxial with the second feed pipe B7. The axis of the second feed wheel group is perpendicular to the axis of the second feed pipe A6. The end of the second feed pipe B7 facing away from the second feed wheel group is connected to the feed end of the second heat dissipation device.

[0037] As a preferred method, Figure 2 , Figure 3 As shown, the heating output system includes an electrode heating block 8, a linear feed cavity 9, and a feed pipe 10. The linear feed cavity 9 is arranged in the electrode heating block 8, the inner diameter of the linear feed cavity 9 is larger than the outer diameter of the feed pipe 10, one end of the feed pipe 10 is coaxially inserted into the linear feed cavity 9, a gap is preset between the end of the feed pipe 10 inserted into the linear feed cavity 9 and the end of the linear feed cavity 9 facing away from the feed pipe 10, the nozzle 2 is arranged on the end of the electrode heating block 8 facing away from the feed pipe 10, the nozzle 2 is coaxially connected to the end of the linear feed cavity 9 facing away from the feed pipe 10, the discharge end of the second heat dissipation device is connected to the input end of the feed pipe 10, the discharge end of the first heat dissipation device is communicated with the side wall of the linear feed cavity 9, and the distance from the output end of the first feed system to the nozzle 2 is greater than the distance from the output end of the feed pipe 10 to the nozzle 2. After such design, the fiber composite material input from the second feeding system enters the vertical linear feeding cavity 9 from the feeding pipe 10, while the fiber composite material input from the second feeding system enters the linear feeding cavity 9 from the side wall of the linear feeding cavity 9 and is wrapped around the surface of the fiber composite material input from the second feeding system, so that the two fiber composite materials have hierarchy, thereby distinguishing which fiber composite material is the main material and which fiber composite material is the auxiliary material.

[0038] As a preferred mode, the second heat dissipation device includes a discharge pipe 11, the output end of the discharge pipe 11 is a cone 13, the discharge pipe 11 is coaxial with the feed pipe 10, the input end of the discharge pipe 11 is connected to the output end of the second feeding system, the output end of the discharge pipe 11 extends into the feed end of the feed pipe 10, a preset gap is provided between the output end of the feed pipe 10 and the inner wall of the linear feed cavity 9, and a preset gap is provided between the outer wall of the output end of the discharge pipe 11 and the inner wall of the feed end of the feed pipe 10. After such a setting, heat transfer between the feed pipe 10 and the discharge pipe 11 can be avoided without using a heat dissipation device such as a fan. Such a design reduces the use of components, simplifies the overall structure, and reduces the cost.

[0039] As a preferred mode, the feed end of the feed pipe 10 is a funnel-shaped 14 that matches the output end of the discharge pipe 11. This arrangement facilitates the material transported by the second feeding system to enter the feed pipe 10.

[0040] As a preferred mode, the second feed wheel group includes a second feed wheel A15 and a second feed wheel B16, the second feed wheel A15 and the second feed wheel B16 are both rotatably arranged on the front side of the back plate 1, the second feed motor 17 is fixedly arranged on the back side of the back plate 1, the second feed wheel A15 is coaxially provided with a second gear A18 on the end face, the second feed wheel B16 is coaxially provided with a second gear B19 on the end face, the second gear A18 and the second gear B19 have the same transmission ratio, the second gear A18 and the second gear B19 are meshed, and the output shaft of the second feed motor 17 is coaxially fixedly connected to the second gear B19. With this design, the second feed motor 17 drives the second feed wheel A15 and the second feed wheel B16 at the same time to transport the fiber composite material.

[0041] As a preferred embodiment, a second mounting block 20 is provided on the front side of the back plate 1 on one side of the conveying direction of the second material conveying system, a second positioning axis 21 perpendicular to the back plate 1 is provided on the front side of the back plate 1 on the other side of the conveying direction of the second material conveying system, a connecting line segment between the second positioning axis 21 and the second mounting block 20 is projected as a line segment with a length in the conveying direction of the second material conveying system, a second screw hole 22 is provided on the second mounting block 20, an axis of the second screw hole 22 is perpendicular to the conveying direction of the second material conveying system, and a second screw hole 22 is provided. The axis is parallel to the back plate 1, and the second positioning shaft 21 is rotatably connected with the second connecting rod 23. A second axial hole 24 is provided between the two ends of the second connecting rod 23. The second axial hole 24 is sleeved on the axle of the second feeding wheel A15. The other end of the second connecting rod 23 is provided with a second through hole 25 coaxial with the second screw hole 22. The inner diameter of the second through hole 25 is larger than the inner diameter of the second screw hole 22. The second bolt 47 penetrates the second through hole 25 from the side of the second connecting rod 23 facing away from the second mounting block 20 and is threadedly connected with the second screw hole 22. After such a setting, the second bolt 47 can be screwed into the length of the second screw hole 22 to drive the second connecting rod 23 to squeeze the axle of the second feeding wheel A15, which plays the role of a brake, thereby adjusting the conveying speed of the second feeding system.

[0042] As a preferred method, Figure 1 , Figure 2 , Figure 8 As shown, the third heat dissipation device includes an annular air outlet pipe 27, the air outlet end of the second fan 26 is connected to the inside of the annular air outlet pipe 27 from the annular outer wall of the annular air outlet pipe 27, an annular air outlet 28 is coaxially arranged on the annular inner wall of the annular air outlet pipe 27, and the outlet of the nozzle 2 is located in the annular shape of the annular air outlet pipe 27. With this design, the third heat dissipation device can dissipate heat more thoroughly for the material flowing out of the nozzle 2.

[0043] As a preferred embodiment, a material cutting device is further provided between the second material conveying pipe B7 and the feeding end of the second heat dissipation device.

[0044] As a preferred method, Figure 7As shown, the material cutting device includes a material cutting shell 29, a circular cavity 30, an arc-shaped blade 31, and a material channel 33. The material channel 33 and the circular cavity 30 are arranged in the material cutting shell 29. The material channel 33 is coaxial with the second material conveying pipe B7. The circular cavity 30 is arranged between the two ends of the material channel 33. The axis of the circular cavity 30 is perpendicular to the axis of the material channel 33. The arc-shaped blade 31 is arranged in the circular cavity 30. The radius of the virtual circle where the outer arc surface of the arc-shaped blade 31 is located is equal to the radius of the circular cavity 30. The outer arc surface of the arc-shaped blade 31 is in sliding contact with the inner circumferential surface of the circular cavity 30. The curvature of the outer arc surface of the arc-shaped blade 31 is less than The projection of the arc blade 31 on a plane perpendicular to the axis of the material channel 33 surrounds the projection of the material channel 33 on a plane perpendicular to the axis of the material channel 33. The width of the arc blade 31 is equal to the length of the circular cavity 30. The servo motor 32 is arranged on the back of the back plate 1. The output shaft of the servo motor 32 penetrates into the circular cavity 30 and is fixedly connected to the arc blade 31. The output shaft of the servo motor 32 is coaxial with the virtual circle where the outer arc surface of the arc blade 31 is located. One end of the material channel 33 is connected to the output end of the second material delivery pipe B7, and the other end of the material channel 33 is connected to the feed end of the second heat dissipation device. The servo motor 32 drives the arc blade 31 to rotate and cut off the continuous fiber composite consumables, so that the material is cut off, and the remaining consumables continue to be printed. At the same time, due to the setting of the arc blade 31, the arc blade 31 can prevent the fiber composite consumables located in the second material delivery pipe B7 from continuing to enter the second heat dissipation device after cutting off the fiber composite consumables.

[0045] As a preferred embodiment, the first feed system includes a first feed pipe A34, a first feed wheel group, and a first feed pipe B35. The first feed wheel group is arranged between the first feed pipe A34 and the first feed pipe B35. The first feed pipe A34 is coaxial with the first feed pipe B35. The axis of the first feed wheel group is perpendicular to the axis of the first feed pipe A34. The end of the first feed pipe B35 facing away from the first feed wheel group is connected to the feed end of the first heat dissipation device.

[0046] As a preferred embodiment, the first feed wheel group includes a first feed wheel A36 and a first feed wheel B37. The first feed wheel A36 and the first feed wheel B37 are both rotatably arranged on the front side of the back plate 1. The first feed motor 38 is fixedly arranged on the back side of the back plate 1. A first gear A39 is coaxially arranged on the end face of the first feed wheel A36. A first gear B40 is coaxially arranged on the end face of the first feed wheel B37. The transmission ratios of the first gear A39 and the first gear B40 are equal. The first gear A39 and the first gear B40 are meshed. The output shaft of the first feed motor 38 is coaxially fixedly connected to the first gear B40.

[0047] As a preferred embodiment, a first mounting block 41 is provided on the front side of the back plate 1 on the side of the conveying direction of the first material conveying system, and a first positioning axis 42 perpendicular to the back plate 1 is provided on the front side of the back plate 1 on the other side of the conveying direction of the first material conveying system, and the projection of the connecting line segment between the first positioning axis 42 and the first mounting block 41 in the conveying direction of the first material conveying system is a line segment with a length, and a first screw hole 43 is provided on the first mounting block 41, and the axis of the first screw hole 43 is perpendicular to the conveying direction of the first material conveying system, and the first screw hole 43 The axis is parallel to the back plate 1, and a first connecting rod 44 is rotatably connected to the first positioning shaft 42. A first axial hole 45 is provided between the two ends of the first connecting rod 44, and the first axial hole 45 is sleeved on the axle of the first feed wheel A36. The other end of the first connecting rod 44 is provided with a first through hole 46 coaxial with the first screw hole 43, and the inner diameter of the first through hole 46 is larger than the inner diameter of the first screw hole 43. The first bolt 12 penetrates the first through hole 46 from the side of the first connecting rod 44 facing away from the first mounting block 41 and is threadedly connected to the first screw hole 43.

Claims

1. A 3D printing head of a dual extrusion system, characterized in that: The invention comprises a first feeding system, a second feeding system, a heating output system and a nozzle (2); the output end of the first feeding system and the output end of the second feeding system are respectively connected to the feed end of the heating output system via a first heat dissipation device and a second heat dissipation device; the nozzle (2) is arranged at the discharge end of the heating output system; the angle between the output direction of the first feeding system and the output direction of the second feeding system is less than 90 degrees; and a third heat dissipation device is arranged at the output port of the nozzle.

2. The 3D printing head of a dual extrusion system according to claim 1, characterized in that: The first heat dissipation device comprises a first fan (3), a heat sink (4), and a heat pipe (5); the output end of the first feeding system is coaxially connected to one end of the heat sink (5); the other end of the heat sink (5) is connected to the feed end of the heating output system; a plurality of heat sinks (4) are radially arranged between the two ends of the heat sink (5); the first fan (3) is installed on all the heat sinks (4); and the air inlet of the first fan (3) faces the heat sink (4).

3. The 3D printing head of a dual extrusion system according to claim 1, characterized in that: The feeding direction of the second heat dissipation device is colinear with the feeding direction of the heating output system.

4. The 3D printing head of a dual extrusion system according to claim 1, characterized in that: The second material conveying system comprises a second material conveying pipe A (6), a second material conveying wheel group, and a second material conveying pipe B (7). The second material conveying wheel group is arranged between the second material conveying pipe A (6) and the second material conveying pipe B (7). The second material conveying pipe A (6) and the second material conveying pipe B (7) are coaxial. The axis of the second material conveying wheel group is perpendicular to the axis of the second material conveying pipe A (6). The end of the second material conveying pipe B (7) facing away from the second material conveying wheel group is connected to the feed end of the second heat dissipation device.

5. The 3D printing head of the dual extrusion system according to claim 4, characterized in that: The heating output system comprises an electrode heating block (8), a linear feed cavity (9), and a feed pipe (10). The linear feed cavity (9) is arranged in the electrode heating block (8). The inner diameter of the linear feed cavity (9) is larger than the outer diameter of the feed pipe (10). One end of the feed pipe (10) is coaxially inserted into the linear feed cavity (9). A gap is preset between the end of the feed pipe (10) inserted into the linear feed cavity (9) and the end of the linear feed cavity (9) facing away from the feed pipe (10). The nozzle (2) is arranged on the end of the electrode heating block (8) facing away from the feed pipe (10), and the nozzle (2) is coaxially connected to the end of the linear feed cavity (9) facing away from the feed pipe (10). The discharge end of the second heat dissipation device is connected to the input end of the feed pipe (10), and the discharge end of the first heat dissipation device is connected to the side wall of the linear feed cavity (9). The distance from the output end of the first feed system to the nozzle (2) is greater than the distance from the output end of the feed pipe (10) to the nozzle (2).

6. The 3D printing head of a dual extrusion system according to claim 5, characterized in that: The second heat dissipation device comprises a discharge pipe (11), the output end of the discharge pipe (11) is tapered (13), the discharge pipe (11) is coaxial with the feed pipe (10), the input end of the discharge pipe (11) is connected to the output end of the second feeding system, the output end of the discharge pipe (11) extends into the feed end of the feed pipe (10), a gap is preset between the output end of the feed pipe (10) and the inner wall of the linear feed cavity (9), and a gap is preset between the outer wall of the output end of the discharge pipe (11) and the inner wall of the feed cavity of the feed pipe (10).

7. The 3D printing head of a dual extrusion system according to claim 6, characterized in that: The feed end of the feed pipe (10) is in the shape of a funnel (14) that matches the output end of the discharge pipe (11).

8. The 3D printing head of a dual extrusion system according to claim 4, characterized in that: The invention also comprises a back plate (1), wherein a first material feeding system, a second material feeding system, a heating output system and a nozzle (2) are all arranged on the front side of the back plate (1); the second material feeding wheel group comprises a second material feeding wheel A (15) and a second material feeding wheel B (16); the second material feeding wheel A (15) and the second material feeding wheel B (16) are both rotatably arranged on the front side of the back plate (1); a second material feeding motor (17) is fixedly arranged on the back side of the back plate (1); a second gear A (18) is coaxially arranged on the end face of the second material feeding wheel A (15); a second gear B (19) is coaxially arranged on the end face of the second material feeding wheel B (16); the transmission ratios of the second gear A (18) and the second gear B (19) are equal; the second gear A (18) and the second gear B (19) are meshed; and the output shaft of the second material feeding motor (17) is coaxially and fixedly connected to the second gear B (19).

9. The 3D printing head of a dual extrusion system according to claim 8, characterized in that: A second mounting block (20) is provided on the front side of the back plate (1) on one side of the conveying direction of the second material conveying system, a second positioning axis (21) perpendicular to the back plate (1) is provided on the front side of the back plate (1) on the other side of the conveying direction of the second material conveying system, a connecting line segment between the second positioning axis (21) and the second mounting block (20) is projected as a line segment having a length in the conveying direction of the second material conveying system, a second screw hole (22) is provided on the second mounting block (20), an axis of the second screw hole (22) is perpendicular to the conveying direction of the second material conveying system, and an axis of the second screw hole (22) is parallel to the back plate (1). ), a second connecting rod (23) is rotatably connected to the second positioning shaft (21), a second axial hole (24) is provided between the two ends of the second connecting rod (23), the second axial hole (24) is sleeved on the axle of the second feed wheel A (15), the other end of the second connecting rod (23) is provided with a second through hole (25) coaxial with the second screw hole (22), the inner diameter of the second through hole (25) is larger than the inner diameter of the second screw hole (22), and a second bolt (47) passes through the second through hole (25) from the side of the second connecting rod (23) facing away from the second mounting block (20) and is threadedly connected to the second screw hole (22).

10. The 3D printing head of a dual extrusion system according to claim 1, characterized in that: The third heat dissipation device comprises an annular air outlet pipe (27), the air outlet end of the second fan (26) is connected to the interior of the annular air outlet pipe (27) from the annular outer wall of the annular air outlet pipe (27), an annular air outlet (28) is coaxially provided on the annular inner wall of the annular air outlet pipe (27), and the outlet of the nozzle (2) is located in the ring of the annular air outlet pipe (27).

11. The 3D printing head of a dual extrusion system according to claim 9, characterized in that: A material cutting device is also provided between the second material conveying pipe B (7) and the feeding end of the second heat dissipation device.

12. The 3D printing head of the dual extrusion system according to claim 11, characterized in that: The material cutting device comprises a material cutting shell (29), a circular cavity (30), an arc-shaped blade (31), and a material channel (33). The material channel (33) and the circular cavity (30) are arranged in the material cutting shell (29). The material channel (33) is coaxial with the second material conveying pipe B (7). The circular cavity (30) is arranged between the two ends of the material channel (33). The axis of the circular cavity (30) is perpendicular to the axis of the material channel (33). The arc-shaped blade (31) is arranged in the circular cavity (30). The radius of the virtual circle where the outer arc surface of the arc-shaped blade (31) is located is equal to the radius of the circular cavity (30). The outer arc surface of the arc-shaped blade (31) is in sliding contact with the inner circumferential surface of the circular cavity (30). The curvature of the outer arc surface of the arc-shaped blade (31) is less than The projection of the arc-shaped blade (31) on a plane perpendicular to the axis of the material channel (33) surrounds the projection of the material channel (33) on a plane perpendicular to the axis of the material channel (33); a servo motor (32) is arranged on the back side of the back plate (1); an output shaft of the servo motor (32) penetrates into the circular cavity (30) and is fixedly connected to the arc-shaped blade (31); the output shaft of the servo motor (32) is coaxial with a virtual circle where the outer arc surface of the arc-shaped blade (31) is located; one end of the material channel (33) is connected to the output end of the second material delivery pipe B (7); and the other end of the material channel (33) is connected to the feed end of the second heat dissipation device.

13. The 3D printing head of the dual extrusion system according to claim 12, characterized in that: The first material conveying system comprises a first material conveying pipe A (34), a first material conveying wheel group, and a first material conveying pipe B (35). The first material conveying wheel group is arranged between the first material conveying pipe A (34) and the first material conveying pipe B (35). The first material conveying pipe A (34) and the first material conveying pipe B (35) are coaxial. The axis of the first material conveying wheel group is perpendicular to the axis of the first material conveying pipe A (34). The end of the first material conveying pipe B (35) facing away from the first material conveying wheel group is connected to the feed end of the first heat dissipation device.

14. The 3D printing head of the dual extrusion system according to claim 13, characterized in that: The first feed wheel assembly comprises a first feed wheel A (36) and a first feed wheel B (37). The first feed wheel A (36) and the first feed wheel B (37) are both rotatably arranged on the front side of the back plate (1). A first feed motor (38) is fixedly arranged on the back side of the back plate (1). A first gear A (39) is coaxially arranged on the end face of the first feed wheel A (36). A first gear B (40) is coaxially arranged on the end face of the first feed wheel B (37). The transmission ratios of the first gear A (39) and the first gear B (40) are equal. The first gear A (39) and the first gear B (40) are meshed. The output shaft of the first feed motor (38) is coaxially fixedly connected to the first gear B (40).

15. The 3D printing head of the dual extrusion system according to claim 14, characterized in that: A first mounting block (41) is provided on the front side of the back plate (1) on one side of the conveying direction of the first material conveying system, and a first positioning axis (42) perpendicular to the back plate (1) is provided on the front side of the back plate (1) on the other side of the conveying direction of the first material conveying system, the projection of the connecting line segment between the first positioning axis (42) and the first mounting block (41) in the conveying direction of the first material conveying system is a line segment with a length, and a first screw hole (43) is provided on the first mounting block (41), the axis of the first screw hole (43) is perpendicular to the conveying direction of the first material conveying system, and the axis of the first screw hole (43) is parallel to the back plate ( 1), a first connecting rod (44) is rotatably connected to the first positioning shaft (42), a first axial hole (45) is provided between the two ends of the first connecting rod (44), the first axial hole (45) is sleeved on the axle of the first feeding wheel A (36), the other end of the first connecting rod (44) is provided with a first through hole (46) coaxial with the first screw hole (43), the inner diameter of the first through hole (46) is larger than the inner diameter of the first screw hole (43), and a first bolt (12) passes through the first through hole (46) from the side of the first connecting rod (44) facing away from the first mounting block (41) and is threadedly connected to the first screw hole (43).

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