Novel high-flow printing head structure

Abstract

The utility model belongs to the technical field of 3D printing, and particularly relates to a novel large-flow printing head structure which comprises a nozzle, a capillary tube, a heat dissipation area, a high-temperature heating area and a low-temperature heating area, the nozzle is arranged at the end, back to the high-temperature heating area, of the low-temperature heating area, and the high-temperature heating area is located on the side, back to the nozzle, of the low-temperature heating area. The heat dissipation area is located on the side, opposite to the high-temperature heating area, of the low-temperature heating area, the heat dissipation area, the high-temperature heating area and the low-temperature heating area are provided with a first channel, a second channel and a third channel respectively, the first channel is communicated with the second channel through a capillary tube, and the end, away from the capillary tube, of the second channel is communicated with one end of the third channel. The other end of the third channel communicates with the nozzle, and the end, back to the second channel, of the first channel penetrates to the side, back to the high-temperature heating area, of the heat dissipation area. The problem of how to manufacture a heating structure with higher heat utilization efficiency than a conventional structure so as to achieve a larger-flow printing head is solved.

Description

Technical Field

[0001] This application belongs to the technical field of 3D printing, and specifically relates to a novel large-flow print head structure. Background Art

[0002] The fused deposition modeling (FDM) 3D printer has a simple mechanical structure and the lowest manufacturing and maintenance costs. Therefore, FDM is also the most widely used 3D printing technology in the world today. The print head (Hotend) of an FDM-level 3D printer includes sub-components such as a heat sink, a throat tube, a heating block, and a nozzle. When a conventional FDM printer is printing at high speed, the flow rate of the consumable melted and extruded by the print head cannot meet the printing requirements, resulting in a phenomenon where the extrusion of the consumable cannot keep up with the feeding speed, causing the extruder to jam and the printing to fail. Therefore, in order to meet the high-speed printing requirements, there is an urgent need in the market for a print head with a large flow rate that can meet the high-speed printing needs. At the same time, the conventional print head is heated by a single heating block. The consumable enters the high-temperature heating block through the throat tube and melts. The heat conduction makes the temperature of the entire heating block uniform. However, when the consumable melts after entering the upper end of the heating block, the upper end of the heating block consumes the flow rate, and the lower end of the heating block does not require too much heat, wasting the heat at the lower end of the heating block. Therefore, there is a need in the market for a heating structure with a higher heat utilization efficiency than the conventional structure to achieve a larger flow rate. Summary of the Utility Model

[0003] The main purpose of this application is to address the shortcomings of the existing technology by adopting a design method of an integrated structure with segmented heating. The pre-melting end of the upper heating block is heated by a high-temperature heating zone, and the melting end of the lower heating block is heated by a low-temperature heating zone. This structure does not waste heat and can achieve high heat utilization efficiency, thereby improving the heat utilization efficiency of the high-temperature heating zone to achieve a higher flow rate effect, and solving the problem of how to manufacture a heating structure with a higher heat utilization efficiency than the conventional structure to achieve a larger flow rate print head.

[0004] To achieve the above object, the technical solution adopted in this application is:

[0005] A novel large-flow print head structure includes a nozzle, a heat dissipation zone, a high-temperature heating zone, and a low-temperature heating zone. The nozzle is disposed at one end of the low-temperature heating zone facing away from the high-temperature heating zone. The high-temperature heating zone is located on the side of the low-temperature heating zone facing away from the nozzle. The heat dissipation zone is located on the side of the low-temperature heating zone facing away from the high-temperature heating zone. A thermistor for measuring the temperature of the nozzle is fixed on the low-temperature heating zone.

[0006] Preferably, it further includes a capillary tube. A first channel, a second channel, and a third channel are respectively provided on the heat dissipation area, the high-temperature heating area, and the low-temperature heating area. The first channel is communicated with the second channel through the capillary tube. One end of the second channel away from the capillary tube is communicated with one end of the third channel, and the other end of the third channel is communicated with the nozzle. The end of the first channel facing away from the second channel penetrates to the side of the heat dissipation area facing away from the high-temperature heating area.

[0007] Preferably, an upper heating block is arranged in the high-temperature heating area, a lower heating block is arranged in the low-temperature heating area, and a fixing plate is arranged between the high-temperature heating area and the low-temperature heating area.

[0008] Preferably, a second through hole is provided on the fixing plate, a bolt penetrates through the second through hole, the upper end of the bolt is fixedly connected with the upper heating block by threads, and the lower end of the bolt is fixedly connected with the lower heating block by threads.

[0009] Preferably, a third through hole is further provided on the fixing plate away from the second through hole. The upper and lower ends of the heating sheet penetrate through the third through hole. The upper end of the heating sheet is fixedly connected with the upper heating block, and the lower end of the heating sheet is fixedly connected with the lower heating block.

[0010] Preferably, a screw hole coaxial with the third channel is provided at the lower end of the lower heating block. The inner diameter of the screw hole is larger than the inner diameter of the third channel. The nozzle is provided with threads matching the screw hole, and the nozzle is threadedly connected with the screw hole. The measuring end of the thermistor is located on the inner side wall of the screw hole.

[0011] Preferably, it further includes a fixing seat and a housing. The fixing seat is fixed on the fixing plate, the housing is arranged on the fixing seat, the upper heating block is located in the fixing seat, and the heat dissipation area is located in the housing and above the fixing seat.

[0012] Preferably, the heat dissipation area includes a heat dissipation body, and the heat dissipation body is fixedly arranged in the housing.

[0013] Preferably, the heat dissipation body is a multi-fin copper alloy heat dissipation body.

[0014] Preferably, the upper heating block and the lower heating block are respectively connected to the fixing plate in a radially anti-torsional manner.

[0015] Preferably, a groove with a non-circular cross-section is provided on the lower surface of the upper heating block, and a groove with a non-circular cross-section is also provided on the upper surface of the lower heating block. Convex platforms matching the grooves on the lower surface of the upper heating block and the grooves on the upper surface of the lower heating block are provided on the upper and lower surfaces of the fixing plate.

[0016] Preferably, the heat dissipation body is a multi-fin copper alloy heat dissipation body.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] 1. The present application adopts a design method of an overall structure with segmented heating. The pre-melting end of the upper heating block is heated by a high-temperature heating zone, and the melting end of the lower heating block is heated by a low-temperature heating zone. This structure does not waste heat and can achieve high thermal utilization efficiency, thereby improving the thermal utilization efficiency of the high-temperature heating zone to achieve a higher flow rate effect, and solving the problem of how to manufacture a heating structure with higher heat utilization efficiency than conventional structures to achieve a larger flow rate print head.

[0019] 2. A groove with a non-circular cross-section is provided on the lower surface of the upper heating block in the present application, and a groove with a non-circular cross-section is also provided on the upper surface of the lower heating block. Both the upper and lower surfaces of the heat insulation plate are provided with bosses that cooperate with the grooves on the lower surface of the upper heating block and the grooves on the upper surface of the lower heating block. This makes the lower heating block not rotate relative to the heat insulation plate and the upper heating block, that is, when the nozzle is rotated, the lower heating block will not rotate relative to the heat insulation plate and the upper heating block.

[0020] 3. The design of the present application is simple, has excellent performance, is easy to use, and has high reliability.

[0021] 4. Compared with other large-flow products on the market, the present application distinguishes between the pre-melting end and the melting end zones. While extending the hot melt end to obtain a larger flow rate effect, it uses segmented heating to efficiently utilize heat energy, reduces the power requirement of the heating sheet for the long melting section, does not increase the product size additionally, reduces the installation size requirement and the product weight, so as to achieve a faster, large-flow and lightweight print head. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the present application;

[0023] Figure 2 is a schematic diagram showing the internal structure of the present application;

[0024] Figure 3 is an exploded view of the present application;

[0025] Figure 4 is a schematic diagram showing the lower end of the lower heating block.

[0026] Among them, 1. Nozzle; 2. Capillary; 3. Heat sink; 4. Fixed plate; 5. Thermistor; 6. Upper heating block; 7. Lower heating block; 9. Second through hole; 10. Bolt; 11. Third through hole; 12. Heating sheet; 13. Threaded hole; 14. Fixed seat; 15. Housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] As Figures 1-4As shown in the figure, a new type of large-flow print head structure includes a nozzle 1, a heat dissipation area, a high-temperature heating area, and a low-temperature heating area. The nozzle 1 is arranged at one end of the low-temperature heating area facing away from the high-temperature heating area. The high-temperature heating area is located on the side of the low-temperature heating area facing away from the nozzle, and the heat dissipation area is located on the side of the low-temperature heating area facing away from the high-temperature heating area. A thermistor 5 for measuring the temperature of the nozzle 1 is fixed on the low-temperature heating area.

[0028] In this embodiment, the material passes through the heat dissipation area, the high-temperature heating area, and the low-temperature heating area in sequence and then enters the nozzle 1. The heat dissipation area is provided to prevent the heat of the high-temperature heating area from spreading to the side of the high-temperature heating area facing away from the low-temperature heating area and affecting the material transportation; through the pre-melting end of the high-temperature heating area and the melting end heated by the low-temperature heating area, this structure will not cause waste and achieves high thermal utilization efficiency.

[0029] As a preferred method, it further includes a capillary 2. A first channel, a second channel, and a third channel are respectively provided on the heat dissipation area, the high-temperature heating area, and the low-temperature heating area. The first channel is communicated with the second channel through the capillary. One end of the second channel away from the capillary is communicated with one end of the third channel, and the other end of the third channel is communicated with the nozzle. The end of the first channel facing away from the second channel penetrates to the side of the heat dissipation area facing away from the high-temperature heating area.

[0030] In this embodiment, the material enters the second channel of the high-temperature heating area from the first channel of the heat dissipation area, and then enters the nozzle 1 after passing through the third channel of the low-temperature heating area. The heat dissipation area is provided to prevent the heat of the high-temperature heating area from spreading to the side of the high-temperature heating area facing away from the low-temperature heating area and affecting the material transportation.

[0031] As a preferred method, an upper heating block 6 is arranged in the high-temperature heating area, a lower heating block 7 is arranged in the low-temperature heating area, and a fixing plate 4 is arranged between the high-temperature heating area and the low-temperature heating area.

[0032] As a preferred method, a second through hole 9 is provided on the fixing plate 4. A bolt 10 penetrates through the second through hole 9. The upper end of the bolt 10 is fixedly connected to the upper heating block 6 by threading, and the lower end of the bolt 10 is fixedly connected to the lower heating block 7 by threading. The fixing plate 4 between the upper and lower heating blocks is inserted into the upper and lower heating blocks. The structure locked by the bolt 10 forms an anti-torsion structure, meeting the customer's requirement of replacing the nozzle 1 with one hand. At the same time, this structure has high strength and reliability and can prevent the print head from being impacted and bent due to misoperation.

[0033] As a preferred embodiment, a third through-hole 11 is further provided on the fixing plate 4 away from the second through-hole 9. The upper and lower ends of the heating sheet 12 penetrate through the third through-hole 11. The upper end of the heating sheet 12 is fixedly connected to the upper heating block 6, and the lower end of the heating sheet 12 is fixedly connected to the lower heating block 7.

[0034] As a preferred embodiment, a threaded hole 13 coaxial with the third channel is provided at the lower end of the lower heating block 7. The inner diameter of the threaded hole 13 is larger than the inner diameter of the third channel. The nozzle 1 is provided with a thread that matches the threaded hole 13. The nozzle 1 is threadedly connected to the threaded hole 13. The measuring end of the thermistor 5 is located on the inner side wall of the threaded hole 13. This setting facilitates the replacement of the nozzle 1. At the same time, the thermistor 5 is convenient for measuring the temperature of the material ejected from the nozzle 1.

[0035] Preferably, a non-circular cross-section groove is provided on the lower surface of the upper heating block 6, and a non-circular cross-section groove is also provided on the upper surface of the lower heating block 7. Both the upper and lower surfaces of the heat insulation plate 4 are provided with bosses that cooperate with the grooves on the lower surface of the upper heating block 6 and the grooves on the upper surface of the lower heating block 7. This prevents the lower heating block 7 from rotating relative to the heat insulation plate 4 and the upper heating block 6, that is, when the nozzle 1 is rotated, the lower heating block 7 will not rotate relative to the heat insulation plate 4 and the upper heating block 6. Preferably, the non-circular cross-section groove has a hexagonal cross-section.

[0036] As a preferred embodiment, it further includes a fixing base 14 and a housing 15. The fixing base 14 is fixed on the fixing plate 4. The housing 15 is provided on the fixing base 14. The upper heating block 6 is located inside the fixing base 14. The heat dissipation area is located inside the housing 15 and above the fixing base 14.

[0037] As a preferred embodiment, the heat dissipation area includes a heat dissipation body 3, and the heat dissipation body 3 is fixedly provided inside the housing 15. Through the setting of the housing 15, it is convenient to install this application on a 3D printer.

[0038] As a preferred embodiment, the heat dissipation body 3 is a multi-fin copper alloy heat dissipation body. The multi-fin copper alloy heat dissipation body has a better heat dissipation effect in aerodynamics to isolate the heat conducted from the upper heating block to the part of the capillary 2 outside the fixing base 14, preventing abnormal situations such as material softening and clogging on the part of the capillary 2 outside the fixing base 14.

Claims

1. A novel large-flow print head structure, characterized in that, It includes a nozzle (1), a heat dissipation area, a high-temperature heating area, and a low-temperature heating area. The nozzle (1) is arranged at one end of the low-temperature heating area facing away from the high-temperature heating area. The high-temperature heating area is located on the side of the low-temperature heating area facing away from the nozzle, and the heat dissipation area is located on the side of the low-temperature heating area facing away from the high-temperature heating area. A thermistor (5) for measuring the temperature of the nozzle (1) is fixed on the low-temperature heating area.

2. The structure of a novel large-flow print head according to claim 1, wherein, It further includes a capillary tube (2). A first channel, a second channel, and a third channel are respectively arranged on the heat dissipation area, the high-temperature heating area, and the low-temperature heating area. The first channel is communicated with the second channel through the capillary tube (2). One end of the second channel away from the capillary tube (2) is communicated with one end of the third channel, and the other end of the third channel is communicated with the nozzle (1). One end of the first channel facing away from the second channel penetrates to the side of the heat dissipation area facing away from the high-temperature heating area.

3. A novel large-flow print head structure according to claim 2, characterized in that, An upper heating block (6) is arranged in the high-temperature heating area, a lower heating block (7) is arranged in the low-temperature heating area, and a fixing plate (4) is arranged between the high-temperature heating area and the low-temperature heating area.

4. A novel large-flow print head structure according to claim 3, characterized in that, A second through hole (9) is provided on the fixing plate (4). A bolt (10) penetrates through the second through hole (9). The upper end of the bolt (10) is fixedly connected with the upper heating block (6) by threading, and the lower end of the bolt (10) is fixedly connected with the lower heating block (7) by threading.

5. A novel large-flow print head structure according to claim 4, characterized in that, A third through hole (11) is further provided on the fixing plate (4) away from the second through hole (9). The upper and lower ends of a heating sheet (12) penetrate through the third through hole (11). The upper end of the heating sheet (12) is fixedly connected with the upper heating block (6), and the lower end of the heating sheet (12) is fixedly connected with the lower heating block (7).

6. A novel large-flow printhead structure according to claim 4, characterized in that, A screw hole (13) coaxial with the third channel is provided at the lower end of the lower heating block (7). The inner diameter of the screw hole (13) is larger than the inner diameter of the third channel. A thread matching the screw hole (13) is provided on the nozzle (1). The nozzle (1) is threadedly connected with the screw hole (13), and the measuring end of the thermistor (5) is located on the inner side wall of the screw hole (13).

7. A novel large-flow print head structure according to claim 4, characterized in that, It further includes a fixing seat (14) and a housing (15). The fixing seat (14) is fixed on the fixing plate (4), the housing (15) is arranged on the fixing seat (14), the upper heating block (6) is located in the fixing seat (14), and the heat dissipation area is located in the housing (15) and above the fixing seat (14).

8. A novel large-flow printing head structure according to claim 7, characterized in that, The heat dissipation area includes a heat dissipation body (3), and the heat dissipation body (3) is fixedly arranged in the housing (15).

9. A novel large-flow print head structure according to claim 4, characterized in that The upper heating block (6) and the lower heating block (7) are respectively connected to the fixing plate (4) in a radially anti-torsional manner.

10. A novel large-flow print head structure according to claim 1, characterized in that, A groove with a non-circular cross-section is provided on the lower surface of the upper heating block (6), and a groove with a non-circular cross-section is also provided on the upper surface of the lower heating block (7). Convex platforms matching the grooves on the lower surface of the upper heating block (6) and the grooves on the upper surface of the lower heating block (7) are provided on both the upper and lower surfaces of the fixing plate (4).

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