Printing nozzle and printer

Abstract

The utility model belongs to the technical field of printers, and discloses a printing nozzle and a printer. The printing nozzle comprises a rack, a heat dissipation body, a nozzle assembly, a heating piece and an air source assembly. The rack is provided with a feeding hole, a clamping hole and a heat dissipation cavity which communicate in sequence. The heat dissipation body is arranged in the heat dissipation cavity and connected with the clamping hole in a clamped mode, the heat dissipation body is provided with a first channel, and a plurality of heat dissipation fins are arranged on the outer wall of the heat dissipation body at intervals in the length direction. The heat dissipation body and the wire are cooled through the air source assembly and the cooling fins, the cross sectional area of the cooling fin on the side away from the feeding hole is larger than that of the cooling fin on the side close to the feeding hole, the wire at the end, close to the heating piece, of the heat dissipation body can be rapidly cooled, heat accumulation is reduced, and meanwhile the wire can be stably extruded out conveniently. In the multiple adjacent cooling fins, each cooling fin is provided with at least one air guide groove, one air guide groove in each cooling fin is combined to form an annular air guide channel, and heat accumulation at the inlet end of the printing spray head is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of printers, in particular to a print head and a printer. Background Art

[0002] 3D printing is a rapid prototyping technology. Based on a digital model file, it uses powdery metals or plastic and other bondable materials to construct an object by layer-by-layer printing.

[0003] 3D printing is usually implemented by a 3D printer. Existing 3D printers include a wire feeding component and a print head. The wire material is sent into the print head through the wire feeding component, and the molten wire material is extruded through the print head. For the processing of some composite materials, it is required that the print head can perform high-temperature printing above 300 degrees Celsius. During the high-temperature printing process of the existing print head, heat accumulation at the inlet end of the print head is extremely likely to occur, resulting in local softening of the wire material at the inlet end, insufficient pushing force of the wire feeding component on the wire material, and the problem that the molten wire material cannot be stably extruded, thus failing to meet the requirements of stable printing. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a print head and a printer, which reduce heat accumulation at the inlet end of the print head, enable the wire feeding component to stably extrude the wire material, and can meet the requirements of stable printing.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] On the one hand, a print head is provided, including:

[0007] A frame, which is provided with a feeding hole, a clamping hole and a heat dissipation cavity that are sequentially communicated. An air outlet hole is provided on the side wall of the heat dissipation cavity;

[0008] A heat dissipation body, which is arranged in the heat dissipation cavity and is clamped with the clamping hole. The heat dissipation body is provided with a first channel, and the inlet of the first channel is communicated with the feeding hole; a plurality of heat dissipation fins are arranged at intervals along the length direction on the outer wall of the heat dissipation body. Among the plurality of heat dissipation fins, the cross-sectional area of the heat dissipation fin on the side far from the feeding hole is larger than the cross-sectional area of the heat dissipation fin on the side close to the feeding hole; among adjacent plurality of heat dissipation fins, each heat dissipation fin is provided with at least one air guiding groove, and combining one of the air guiding grooves on each heat dissipation fin can form an annular air guiding channel;

[0009] A nozzle assembly, the inlet of which is communicated with the outlet of the first channel, and the outlet of which can extrude the wire material;

[0010] A heating element, which is arranged on the nozzle assembly and is used for heating the wire material;

[0011] The air source assembly is arranged on the frame, and the air outlet of the air source assembly is communicated with the heat dissipation cavity.

[0012] In some possible implementation manners, the plurality of heat sinks are divided into two groups. The heat sinks on one side close to the feed hole are one group, and the heat sinks on the side far from the feed hole are the other group. Among the group of heat sinks on the side far from the feed hole, the plurality of heat sinks are evenly spaced on the heat dissipation body, and the cross-sectional area of each heat sink is the same. Moreover, the plurality of air guide grooves forming the annular air guide channel are circumferentially and evenly spaced in the projection on the cross-section of the heat dissipation body.

[0013] In some possible implementation manners, in the projection, the included angle between the centerlines of two adjacent air guide grooves is 45 degrees, 60 degrees or 90 degrees.

[0014] In some possible implementation manners, the printing nozzle further includes a temperature sensor and a temperature closed-loop control component. The temperature sensor is used to detect the temperature of the nozzle assembly. The temperature closed-loop control component is communicatively connected to the temperature sensor and is communicatively connected to the air source assembly.

[0015] In some possible implementation manners, the frame includes a frame body, a first connecting piece and a housing. The frame body is provided with the feed hole and the clamping hole. The frame body, the first connecting piece and the housing enclose to form the heat dissipation cavity. The first connecting piece is detachably connected to the frame body, and the housing is detachably connected to the first connecting piece.

[0016] In some possible implementation manners, the printing nozzle further includes an annular fixing piece and a locking component. The heating element is sleeved outside the nozzle assembly. The annular fixing piece is sleeved outside the heating element. The locking component presses the annular fixing piece against the outside of the heating element.

[0017] In some possible implementation manners, the air source assembly includes an air guiding assembly and a fan. The air outlet of the air guiding assembly is communicated with the heat dissipation cavity. The fan is arranged at the air inlet of the air guiding assembly.

[0018] In some possible implementation manners, the nozzle assembly includes a throat pipe and a nozzle. The heat dissipation body is provided with a mounting hole. The throat pipe passes through the frame and is fixed in the mounting hole. The throat pipe is provided with a second channel. The inlet of the second channel is communicated with the outlet of the first channel. The nozzle is fixed at the outer end of the throat pipe and is communicated with the outlet of the second channel. The heating element is arranged at the nozzle.

[0019] In some possible embodiments, the printing nozzle further includes a second connecting member. There is at least one set of the frame, the heat dissipation body, the nozzle assembly, and the heating member, and one set of the air source assembly. The heat dissipation cavities of each set of the frames are communicated with the air outlet of the air source assembly, and at least one of the frames is fixed on the second connecting member.

[0020] On the other hand, a printer is provided, which includes a base, a nozzle mounting seat, a wire feeding mechanism, and the printing nozzle as described in any of the above solutions. The nozzle mounting seat is fixed to the base, and the frame is arranged on the nozzle mounting seat; the wire feeding mechanism is fixed to the base and is used to move the wire so that the wire enters from the feeding hole of the base and is extruded from the outlet of the nozzle assembly.

[0021] Advantages of the present utility model:

[0022] The printing nozzle provided by the present utility model includes a frame, a heat dissipation body, a nozzle assembly, a heating member, and an air source assembly. Since the heat dissipation body on the side far from the feeding hole is closer to the heating member, the temperature of the wire in this part is higher, which has a greater impact on the softening of the wire. The cross-sectional area of the heat dissipation fins on the side far from the feeding hole is larger than that of the heat dissipation fins on the side close to the feeding hole, which can achieve rapid cooling of the wire at the end of the heat dissipation body close to the heating member. While reducing heat accumulation, it can ensure that the wire located in the heat dissipation body is in a solid state. When the wire feeding assembly moves the wire, the wire in the heat dissipation body can act as a plunger to stably extrude the molten wire in the nozzle assembly. Among adjacent multiple heat dissipation fins, each heat dissipation fin is provided with at least one air guiding groove. Combining one air guiding groove on each heat dissipation fin can form an annular air guiding channel, and the gas will flow along the annular air guiding channel to form a high-speed rotating air flow, increasing the heat exchange speed between the gas and the outer wall of the heat dissipation body as well as the heat dissipation fins, and further reducing the heat accumulation at the inlet end of the printing nozzle. Description of the Drawings

[0023] Figure 1 is a schematic structural view of the printing nozzle provided by the present utility model from the first perspective;

[0024] Figure 2 is a schematic structural view of the printing nozzle provided by the present utility model from the second perspective;

[0025] Figure 3 is a partial structural view of the printing nozzle provided by the present utility model;

[0026] Figure 4 is a cross-sectional view of the printing nozzle provided by the present utility model;

[0027] Figure 5 is a schematic structural view of the heat dissipation body and the heat dissipation fins involved in the present utility model.

[0028] In the figure:

[0029] 1. Frame; 11. Feeding hole; 12. Clamping hole; 13. Heat dissipation cavity; 14. Air outlet hole; 15. Frame body; 16. First connecting member; 161. First connecting hole; 162. Air inlet hole; 17. Outer shell;

[0030] 2. Heat dissipation body; 21. First channel; 22. Mounting hole;

[0031] 3. Heat sink; 31. Air guiding groove;

[0032] 4. Nozzle assembly; 41. Throat tube; 411. Second channel; 42. Nozzle;

[0033] 5. Heating element;

[0034] 6. Gas source assembly; 61. Fan; 62. Air duct; 63. Air guiding cover; 64. Connecting plate; 641. Third connecting hole;

[0035] 7. Temperature sensor; 8. Annular fixing member; 81. Locking hole; 9. Second connecting member. Detailed implementation mode

[0036] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model are shown in the drawings, rather than all structures.

[0037] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above and over", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and under", and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0039] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] As Figures 1 to 5 shown, the present utility model provides a printing nozzle, which improves the cooling efficiency during the printing process. Under high-temperature printing conditions above 300 degrees Celsius, it can achieve stable extrusion of high-temperature and high-performance composite materials such as polyphenylene sulfide (PPS) and polyether ether ketone (PEEK), expanding the application scope and fields of the 3D printing process. In addition, the structure of the printing nozzle is simple and the weight is relatively light. The printing nozzle includes a frame 1, a heat dissipation body 2, a nozzle assembly 4, a heating element 5 and a gas source assembly 6. The frame 1 is provided with a feeding hole 11, a clamping hole 12 and a heat dissipation cavity 13 that are sequentially communicated. An air outlet hole 14 is provided on the side wall of the heat dissipation cavity 13; the heat dissipation body 2 is arranged in the heat dissipation cavity 13 and is clamped with the clamping hole 12. The heat dissipation body 2 is provided with a first channel 21, and the inlet of the first channel 21 is communicated with the feeding hole 11; a plurality of heat dissipation fins 3 are arranged at intervals along the length direction on the outer wall of the heat dissipation body 2. Among the plurality of heat dissipation fins 3, the cross-sectional area of the heat dissipation fin 3 on the side far from the feeding hole 11 is larger than the cross-sectional area of the heat dissipation fin 3 on the side close to the feeding hole 11; among adjacent plurality of heat dissipation fins 3, each heat dissipation fin 3 is provided with at least one air guiding groove 31, and combining one air guiding groove 31 on each heat dissipation fin 3 can form an annular air guiding channel; the inlet of the nozzle assembly 4 is communicated with the outlet of the first channel 21, and the outlet of the nozzle assembly 4 can extrude the wire material; the heating element 5 is arranged on the nozzle assembly 4 for heating the wire material; the gas source assembly 6 is arranged on the frame 1, and the air outlet of the gas source assembly 6 is communicated with the heat dissipation cavity 13. During operation, the wire material passes through the feeding hole 11 and the first channel 21 in sequence and enters the nozzle assembly 4. The heating element 5 heats the wire material in the nozzle assembly 4, and then the molten wire material is extruded from the outlet of the nozzle assembly 4. During this process, the heat dissipation body 2 and the wire material are cooled by the combined action of the gas source assembly 6 and the heat dissipation fins 3.

[0041] Since the heat sink 2 on the side far from the feed hole 11 is closer to the heating element 5, the temperature of the wire in this part is relatively high, and the wire is prone to softening. The heat sink 2 on the side close to the feed hole 11 is farther from the heating element 5, and the temperature of the wire in this part is relatively low, and the wire is not easily softened. By making the cross-sectional area of the heat sink fins 3 on the side far from the feed hole 11 larger than that of the heat sink fins 3 on the side close to the feed hole 11, rapid cooling of the wire at the end of the heat sink 2 close to the heating element 5 can be achieved. While reducing heat accumulation, it can ensure that the wire located in the heat sink 2 is in a solid state. When the wire feeding assembly moves the wire, the wire in the heat sink 2 can act as a plunger to stably extrude the molten wire in the nozzle assembly 4, meeting the requirements of stable printing. In addition, among adjacent multiple heat sink fins 3, each heat sink fin 3 is provided with at least one air guiding groove 31. Combining one of the air guiding grooves 31 on each heat sink fin 3 can form an annular air guiding channel. The gas flowing into the heat dissipation cavity 13 from the air outlet of the gas source assembly 6 will flow along the annular air guiding channel, forming a high-speed rotating air flow, increasing the heat exchange speed between the gas and the outer wall of the heat sink 2 and the heat sink fins 3, and further reducing the heat accumulation at the inlet end of the printing nozzle. Then, the high-speed rotating air flow is discharged from the air outlet hole 14 on the side wall of the heat dissipation cavity 13, ensuring the stability of the air pressure in the heat dissipation cavity 13.

[0042] Optionally, in this embodiment, the multiple heat sink fins 3 are divided into two groups. The heat sink fins 3 on the side close to the feed hole 11 are one group, and the heat sink fins 3 on the side far from the feed hole 11 are the other group. Among the group of heat sink fins 3 on the side far from the feed hole 11, the multiple heat sink fins 3 are equally spaced on the heat sink 2, the cross-sectional area of each heat sink fin 3 is the same, and the projections of the multiple air guiding grooves 31 forming the annular air guiding channel on the cross-section of the heat sink 2 are circumferentially equally spaced. With such a setting, it is convenient to process the heat sink fins 3 and the air guiding grooves 31, and the annular air guiding channel is a spiral air guiding channel with an equal pitch, making the heat dissipation more uniform. In this embodiment, the structure of the heat sink 2 is a cylindrical structure, and among the group of heat sink fins 3 on the side close to the feed hole 11, the multiple heat sink fins 3 are equally spaced on the heat sink 2.

[0043] Optionally, in the projection, the angular interval between the centerlines of two adjacent air guiding grooves 31 is 45 degrees, 60 degrees, or 90 degrees, which is convenient for processing. The smaller the interval angle, the better the guiding effect on the air flow, and the lower the air outlet power requirement for the gas source assembly 6. The setting position of the air guiding grooves 31 needs to match the number of heat sink fins 3 to ensure that the air flow can bypass the heat sink 2 for one week, so that the heat dissipation tube can dissipate heat evenly in one week. For example, when the interval angle is 90 degrees, at least four heat sink fins 3 are provided; when the interval angle is 60 degrees, at least six heat sink fins 3 are provided; when the interval angle is 45 degrees, at least eight heat sink fins 3 are provided.

[0044] Optionally, the printing nozzle further includes a temperature sensor 7 and a temperature closed-loop control component. The temperature sensor 7 is used to detect the temperature of the nozzle component 4. The temperature closed-loop control component is communicatively connected to the temperature sensor 7 and communicatively connected to the gas source component 6. Optionally, the temperature sensor 7 is adhered to the heating element 5. Specifically, the temperature sensor 7 is adhered to the heating element 5 through a high-temperature adhesive to make the fixation more secure. During operation, the temperature sensor 7 collects the real-time temperature of the nozzle component 4 and feeds the temperature data back to the temperature closed-loop control component. The temperature closed-loop control component adjusts the power of the gas source component 6 based on the temperature data. If the temperature is lower than the expected value, the power and rotation speed of the gas source component 6 are reduced to reduce the heat dissipation. If the temperature is higher than the expected value, the power of the gas source component 6 is increased to increase the heat dissipation, thereby ensuring the accuracy and stability of the temperature of the nozzle component 4 and achieving closed-loop control of the temperature of the nozzle component 4.

[0045] During printing, the temperature closed-loop control component can also control the power of the heating element 5 to preheat or heat the nozzle component 4. Preheating is a process of preheating the nozzle component 4 before the printing task officially starts, preventing problems such as clogging of the nozzle component 4 and incomplete dissolution of the filament due to temperature fluctuations during printing. After meeting the printing conditions, the preheating will switch to heating. The closed-loop control of the temperature of the nozzle component 4 is applicable to the regulation of the preheating temperature and also applicable to the regulation of the heating temperature.

[0046] The regulation of the preheating temperature is controlled by a preheating program, and the regulation of the heating temperature is controlled by a heating program. Among them, the heating temperature has a greater and stronger impact on the printing quality of the composite material. Therefore, the priority of the heating program is higher than the priority of the preheating program. Specifically, when the temperature exceeds the set value of the preheating temperature, the heating program runs and the preheating program stops running; when the heating program runs and pauses, the preheating program runs to prepare for the next heating of the nozzle component 4. Only when the high-priority heating program does not run is the low-priority preheating program scheduled to run. In addition, the priorities of the heating program and the preheating program are higher than the priority of the power regulation of the gas source component 6.

[0047] Optionally, the frame 1 includes a frame body 15, a first connecting piece 16, and a housing 17. The frame body 15 is provided with a feed hole 11 and a clamping hole 12. The frame body 15, the first connecting piece 16, and the housing 17 enclose to form a heat dissipation cavity 13. The first connecting piece 16 is detachably connected to the frame body 15, and the housing 17 is detachably connected to the first connecting piece 16. With such a setting, it is convenient to disassemble and assemble the frame 1. In other embodiments, the first connecting piece 16 is integrally provided with the frame body 15. Specifically, in order to make the connection between the frame body 15 and the first connecting piece 16 more firm, such as Figure 2As shown, the first connecting member 16 is provided with a plurality of first connection holes 161. A plurality of fasteners are correspondingly arranged with the plurality of first connection holes 161. The fasteners pass through the first connection holes 161 and are threadedly connected to the frame body 15. In addition, the outer shell 17 is snap-connected to the first connecting member 16. Alternatively, the outer shell 17 is provided with an external thread, and the inner wall of the first connecting member 16 is provided with an internal thread, and the external thread is threadedly connected to the internal thread. Alternatively, the outer shell 17 is provided with a plurality of second connection holes. A plurality of fasteners are correspondingly arranged with the plurality of second connection holes. The fasteners pass through the second connection holes and are threadedly connected to the first connecting member 16.

[0048] Optionally, as Figure 3 shown, the printing nozzle further includes an annular fixing member 8 and a locking assembly. The heating member 5 is sleeved outside the nozzle assembly 4. The annular fixing member 8 is sleeved outside the heating member 5. The locking assembly presses the annular fixing member 8 against the outside of the heating member 5. By providing the annular fixing member 8 and the locking assembly, the heating member 5 is strengthened. In this embodiment, locking holes 81 are respectively provided at both ends of the annular fixing member 8. The locking assembly passes through the two locking holes 81 to press the annular fixing member 8 against the outside of the heating member 5. Specifically, the locking assembly includes a bolt and a nut. The bolt passes through the two locking holes 81 and is threadedly connected to the nut. Alternatively, the locking assembly includes a clamping post and a buckle. The clamping post passes through the two locking holes 81 and is buckled with the buckle.

[0049] Optionally, the air source assembly 6 includes an air guiding assembly and a fan 61. The air outlet of the air guiding assembly is communicated with the heat dissipation cavity 13. The fan 61 is arranged at the air inlet of the air guiding assembly. By blowing air with the fan 61, the cost is saved. In this embodiment, as Figure 1 and Figure 4 shown, the air guiding assembly includes an air guiding pipe 62 and an air guiding cover 63 with a triangular cross-section in the inner cavity. The first connecting member 16 is provided with an air inlet hole 162. The air outlet of the air guiding pipe 62 is communicated with the air inlet hole 162 of the first connecting member 16. The air inlet of the air guiding pipe 62 is communicated with the air outlet of the air guiding cover 63. The fan 61 is arranged at the air inlet of the air guiding cover 63. The air outlet of the air guiding pipe 62 is communicated with the air inlet hole 162 of the first connecting member 16, realizing the communication between the air outlet of the air source assembly 6 and the heat dissipation cavity 13. By providing the air guiding cover 63 with a triangular cross-section in the inner cavity, the air guiding effect on the air flow is better. Optionally, as Figure 3 shown, the air guiding assembly further includes a connecting plate 64, a bolt and a nut. The connecting plate 64 is fixed on the air guiding pipe 62. The connecting plate 64 is provided with a plurality of third connection holes 641. The air guiding cover 63 is provided with a plurality of fourth connection holes. The bolt passes through the third connection holes 641 and the fourth connection holes and is threadedly connected to the nut. Threadedly fastening the connecting plate 64 and the air guiding cover 63 can improve the installation strength of the structure of the air source assembly 6 and can realize convenient installation.

[0050] Optionally, as Figure 4 and Figure 5As shown in the figure, the nozzle assembly 4 includes a throat 41 and a nozzle 42. The heat sink 2 is provided with a mounting hole 22. The throat 41 passes through the frame 1 and is fixed in the mounting hole 22. The throat 41 is provided with a second channel 411. The inlet of the second channel 411 is communicated with the outlet of the first channel 21. The nozzle 42 is fixed to the outer end of the throat 41 and is communicated with the outlet of the second channel 411. The heating element 5 is arranged on the nozzle 42. Passing the throat 41 through the frame 1 and fixing it in the mounting hole 22 is convenient for the installation of the throat 41 and saves space. In this embodiment, the inner wall of the mounting hole 22 is provided with internal threads, and the outer wall of the throat 41 is provided with external threads. The internal threads are threadedly connected with the external threads, which is convenient for disassembly and has a firm connection. During operation, the wire passes through the feed hole 11, the first channel 21 and the second channel 411 in sequence and enters the nozzle 42. Then, the melted wire is extruded from the outlet of the nozzle 42. In this embodiment, the diameter of the wire extruded through the nozzle 42 is not less than 0.5 mm, which can ensure the printing accuracy. In addition, the printing nozzle further includes a quick connector, and the wire enters the feed hole 11 of the frame 1 through the quick connector.

[0051] Optionally, as Figure 1 and Figure 2 shown, the printing nozzle further includes a second connecting member 9. There is at least one set of the frame 1, the heat sink 2, the nozzle assembly 4 and the heating element 5, and there is one set of the gas source assembly 6. The heat dissipation cavity 13 of each set of the frame 1 is communicated with the air outlet of the gas source assembly 6. At least one frame 1 is fixed on the second connecting member 9. With such a setting, one or more kinds of wires can be printed, expanding the printing range of the printing nozzle.

[0052] The present utility model provides a printer, which includes a machine base, a nozzle mounting seat, a wire feeding mechanism and a printing nozzle. The nozzle mounting seat is fixed on the machine base, and the frame 1 is arranged on the nozzle mounting seat. The wire feeding mechanism is fixed on the machine base and is used to move the wire so that the wire enters from the feed hole 11 of the machine base and is extruded from the outlet of the nozzle assembly 4. During the printing process of this printer, while reducing the heat accumulation at the inlet end of the printing nozzle, it can ensure the stable extrusion of the molten wire in the nozzle assembly 4, meeting the requirements of stable printing.

[0053] Obviously, the above-mentioned embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A printing nozzle, characterized in that: include: The frame (1) is provided with a feed hole (11), a clamping hole (12) and a heat dissipation cavity (13) which are connected in sequence, and an air outlet hole (14) is provided on the side wall of the heat dissipation cavity (13); A heat sink (2), the heat sink (2) being arranged in the heat sink cavity (13) and being engaged with the engaging hole (12), the heat sink (2) being provided with a first channel (21), the inlet of the first channel (21) being connected with the feed hole (11); a plurality of heat sinks (3) being arranged at intervals along the length direction on the outer wall of the heat sink (2), the cross-sectional area of ​​the heat sink (3) on the side away from the feed hole (11) being larger than the cross-sectional area of ​​the heat sink (3) on the side close to the feed hole (11); each of the adjacent plurality of heat sinks (3) being provided with at least one air guide groove (31), and a combination of one of the air guide grooves (31) on each heat sink (3) can form an annular air guide channel; A nozzle assembly (4), wherein the inlet of the nozzle assembly (4) is connected to the outlet of the first channel (21), and the outlet of the nozzle assembly (4) is capable of extruding a filament; A heating element (5) is arranged on the nozzle assembly (4) and is used to heat the wire material; An air source component (6) is arranged on the frame (1), and an air outlet of the air source component (6) is in communication with the heat dissipation cavity (13).

2. The print head according to claim 1, characterized in that: The plurality of heat sinks (3) are divided into two groups, the heat sinks (3) on the side close to the feed hole (11) being one group, and the heat sinks (3) on the side away from the feed hole (11) being another group; in the group of heat sinks (3) on the side away from the feed hole (11), the plurality of heat sinks (3) are evenly spaced on the heat sink (2), the cross-sectional area of ​​each heat sink (3) is the same, and the projections of the plurality of air guide grooves (31) constituting the annular air guide channel on the cross-section of the heat sink (2) are evenly spaced in the circumferential direction.

3. The print head according to claim 2, characterized in that: In the projection, the interval angle between the center lines of two adjacent air guide grooves (31) is 45 degrees, 60 degrees or 90 degrees.

4. The print head according to claim 1, characterized in that: The printing nozzle further comprises a temperature sensor (7) and a temperature closed-loop control component, wherein the temperature sensor (7) is used to detect the temperature of the nozzle component (4), and the temperature closed-loop control component is communicatively connected to the temperature sensor (7) and is also communicatively connected to the air source component (6).

5. The print head according to claim 1, characterized in that: The frame (1) comprises a frame body (15), a first connecting piece (16) and a shell (17); the frame body (15) is provided with the feed hole (11) and the clamping hole (12); the frame body (15), the first connecting piece (16) and the shell (17) together form the heat dissipation cavity (13); the first connecting piece (16) is detachably connected to the frame body (15); and the shell (17) is detachably connected to the first connecting piece (16).

6. The print head according to claim 1, characterized in that: The printing nozzle also includes an annular fixing member (8) and a locking assembly. The heating member (5) is sleeved outside the nozzle assembly (4), the annular fixing member (8) is sleeved outside the heating member (5), and the locking assembly presses the annular fixing member (8) against the outside of the heating member (5).

7. The print head according to any one of claims 1 to 6, characterized in that: The air source component (6) comprises an air guide component and a fan (61); the air outlet of the air guide component is in communication with the heat dissipation cavity (13); and the fan (61) is arranged at the air inlet of the air guide component.

8. The print head according to any one of claims 1 to 6, characterized in that: The nozzle assembly (4) comprises a throat (41) and a nozzle (42); the heat sink (2) is provided with a mounting hole (22); the throat (41) passes through the frame (1) and is fixed in the mounting hole (22); the throat (41) is provided with a second channel (411); the inlet of the second channel (411) is connected to the outlet of the first channel (21); the nozzle (42) is fixed to the outer end of the throat (41) and is connected to the outlet of the second channel (411); the heating element (5) is arranged on the nozzle (42).

9. The print head according to any one of claims 1 to 6, characterized in that: The printing nozzle also includes a second connecting member (9), the frame (1), the heat sink (2), the nozzle assembly (4) and the heating element (5) are each provided with at least one group, the air source assembly (6) is provided with one group, the heat dissipation cavity (13) of each group of the frame (1) is connected to the air outlet of the air source assembly (6), and at least one of the frames (1) is fixed on the second connecting member (9).

10. A printer, characterized in that: It comprises a machine base, a nozzle mounting seat, a wire feeding mechanism and a printing nozzle as described in any one of claims 1 to 9, wherein the nozzle mounting seat is fixed to the machine base, and a frame (1) is arranged on the nozzle mounting seat; the wire feeding mechanism is fixed to the machine base and is used to move the wire material so that the wire material enters from the feed hole (11) of the machine base and is extruded from the outlet of the nozzle assembly (4).

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