Fused deposition 3D printer nozzle

Abstract

The utility model relates to the technical field of rapid prototyping, in particular to a fused deposition 3D printer nozzle. The capillary tube, the heating body and the nozzle are sequentially butted. The heat dissipation body is sleeved on the periphery of the capillary tube. And the anti-torsion function part is used as a connection transition between the heating body and the heat dissipation body. In the printing process, when the nozzle is impacted by accidental force, the anti-torsion function part acts immediately, generated bending moment and torsion moment are conducted to the heat dissipation body immediately, at the moment, the stress main body is converted into the heat dissipation body with high structural strength, and therefore the overall anti-collision capacity of the fused deposition 3D printer spray head is effectively improved. Moreover, the ratio of the design length of the heating body to the overall length of the hot end is greatly increased, and the anti-torque function part is used, so that the jitter amplitude and the jitter frequency of the nozzle can be kept within a reasonable value range even under the condition of a high-speed and large-flow printing mode.

Description

Technical Field

[0001] The utility model relates to the technical field of rapid prototyping, in particular to a fused deposition model 3D printer nozzle. Background Art

[0002] 3D printing, also known as additive manufacturing, is a technology that creates physical parts by adding material layer by layer based on three-dimensional CAD data. Taking fused deposition modeling (FDM) 3D printing, the most widely used technology at present, as an example, the general process is as follows: first, a 3D model is designed using computer-aided modeling software (such as CAD software). This model is then processed using slicing software. The 3D printer selects a molding method and generates a work path. Using the FDM 3D printer nozzle, the raw material is printed and deposited layer by layer until the 3D model is completed.

[0003] In the prior art, the nozzle of a fused deposition model 3D printer is mainly composed of a pneumatic joint, a material guide tube, a heat dissipation tube, a throat, a heating block, and a nozzle (such as Figure 1 ). Along its length, the material guide tube is surrounded by a pneumatic joint and a throat in sequence, and the outer periphery of the throat is covered with a heat dissipation pipe. The material guide tube is artificially divided into two sections, wherein the material guide section is used to introduce solid consumables and is covered by a pneumatic joint, and the preheating section is used to preheat the solid consumables, which is directly plugged into the nozzle as a whole. The heating block is covered on the outer periphery of the nozzle. In the process of the consumable flowing through the nozzle, it is converted from a solid state to a molten state due to the continuous input of heat energy, and is extruded through the nozzle under the action of the extrusion force. When the fused deposition printer is set to high-speed printing mode, the nozzle maintains a high-speed motion state for a long time. In addition, the nozzle is used as the installation base of the heating block, and the total weight is relatively large, which will be accompanied by a large inertial force, thereby causing the nozzle to jitter more severely, which will inevitably make the working path difficult to follow accurately, and will also seriously reduce the molding quality of the 3D printed product. Furthermore, due to the defects in the existing design structure, during the actual 3D printing process, when the nozzle is subjected to unexpected impact force, the material guide tube on which the nozzle is inserted is extremely prone to bending or even breaking, which will inevitably affect the molding quality of the subsequent 3D printed products and the smooth progress of the printing process, especially when the height of the filament deposition molding layer or the leveling height is abnormal.

[0004] It is also necessary to point out that, as far as the current general conventional design is concerned, Figure 1As shown in , when pre-installing a nozzle, the guide tube must be locked to prevent it from rotating due to torque, and a specialized tool is required to rotate the nozzle, making the entire process time-consuming and labor-intensive. Furthermore, reinstalling the nozzle requires continuous heat tracing to ensure a seamless fit on the guide tube. Furthermore, specialized installation and operation training is required to ensure professional knowledge, otherwise the installation process is prone to errors. Therefore, there is an urgent need for those skilled in the art to address these issues. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a fused deposition model 3D printer nozzle with a simple structural design and low implementation cost, which can prevent the nozzle from being damaged due to accidental collision.

[0006] In order to solve the above-mentioned technical problems, the utility model relates to a fused deposition model 3D printer nozzle, comprising a capillary, a heating body, a nozzle and a heat sink. The capillary, the heating body and the nozzle are connected in sequence, and their respective central axes coincide with each other, so as to form a consumable circulation channel. The heat sink is used to accelerate the heat dissipation rate of the capillary, and is sleeved on the periphery of the capillary. The fused deposition model 3D printer nozzle also includes an anti-torsion functional part. The anti-torsion functional part serves as a connection transition between the heating body and the heat sink. When the nozzle is hit or twisted by an unexpected force, the bending moment and torsional moment generated are transmitted to the heat sink via the anti-torsion functional part.

[0007] As a further improvement to the technical solution disclosed in this utility model, the anti-torsion function comprises an anti-torsion plate, a left-mounted bolt, and a right-mounted bolt. The anti-torsion plate is penetrated by the heater and is detachably connected to the heat sink by means of the left and right bolts. When the nozzle is subjected to lateral force, the movement and dynamics of the anti-torsion plate and the heat sink remain consistent.

[0008] As a further improvement to the technical solution disclosed in this utility model, the torsion plate is sequentially composed of a left-mounted connecting section, a center-mounted sleeve section, and a right-mounted connecting section. The left-mounted connecting section and the right-mounted connecting section are respectively formed with left-mounted and right-mounted internally threaded holes corresponding to the left and right bolts. The center-mounted sleeve section is formed with a through hole for the heater to pass freely through.

[0009] As a further improvement to the technical solution disclosed in the present invention, the top wall of the central sleeve section, located at the front and rear sides of the through hole, continues to extend upward to form a front limiting boss and a rear limiting boss, respectively. Near its upper end, the front side wall of the heater is concave to form a front limiting groove that matches the front limiting boss, and the rear side wall is concave to form a rear limiting groove that matches the rear limiting boss.

[0010] As a further improvement of the technical solution disclosed in the present utility model, the front limiting boss and the rear limiting boss have different design structures and / or design dimensions.

[0011] As a further improvement to the technical solution disclosed in the present invention, the nozzle of the fused deposition model 3D printer further includes a throat, which is used to block the heat conduction path between the heat sink and the capillary tube. The throat is sleeved around the outer periphery of the capillary tube and is inserted with the heat sink as the base.

[0012] As a further improvement to the technical solution disclosed in this utility model, the fused deposition model 3D printer nozzle also includes a heat preservation ring. The heat preservation ring is used to block the heat conduction path between the heating element and the heat sink. The heat preservation ring is freely floating and is mounted on the periphery of the heating element, with the anti-torsion plate as the support.

[0013] As a further improvement to the technical solution disclosed in the present invention, the heat sink is preferably an aluminum casting, consisting of a casting body and fin-shaped heat sink units. The fin-shaped heat sink units are composed of short heat sinks and long heat sinks that are used in pairs. The short heat sinks are formed by extending the left side wall of the casting body to the left, with a number of N being arranged linearly along the length of the casting body. The long heat sinks are formed by extending the right side wall of the casting body to the right, with a number of N being arranged linearly along the length of the casting body. A heat sink cavity is formed within the casting body.

[0014] As a further improvement to the technical solution disclosed in the present invention, the fused deposition model 3D printer nozzle further includes a plastic insulation sleeve, which is used to isolate the heating element from the external environment. The plastic insulation sleeve is fitted around the outer periphery of the heating element and is penetrated by the anti-torsion plate.

[0015] In practical applications, the fused deposition model 3D printer nozzle disclosed in the present invention has achieved at least the following beneficial technical effects, which are specifically manifested as follows:

[0016] 1) During the 3D printing process, when the nozzle is impacted or twisted, the anti-torsion function immediately takes effect, and the generated bending and twisting moments are immediately transmitted to the heat sink. At this time, the force-bearing body is transformed into a heat sink with high structural strength, thereby effectively improving the anti-collision ability of the fused deposition model 3D printer nozzle and preventing damage to the throat due to impact. This ensures that the printer nozzle is free of deformation and other damage, and that the subsequent 3D printing molding quality and the smooth progress of the printing process are maintained;

[0017] 2) The heater is not only used to circulate solid filaments, but also directly serves as the nozzle's insertion base. Combined with the anti-torsion function, even when the fused deposition model is set to high-speed printing mode, the nozzle's vibration amplitude and frequency can be maintained within a reasonable range for a long time, ensuring that the 3D printed product has excellent molding quality.

[0018] 3) Compared with the traditional design structure, the ratio of the design length of the heating body to the overall length of the hot end is greatly increased, which means that the heating path can be extended. In addition, the heating body always maintains a high-power heat output state during the working process, so that the filament can be fully melted during the passage process, and there is less flow resistance during the circulation process. This, on the one hand, helps to ensure the smooth progress of the extrusion process, and the filament extrusion volume is easy to match the feed speed of the 3D printer nozzle; on the other hand, since the filament is fully and thoroughly melted during the circulation process, it can avoid the continuous accumulation of impurities in the filament in the nozzle cavity during the long printing process. This helps to ensure the stability of the nozzle discharge speed and can also effectively prevent the problem of accidental nozzle blockage.

[0019] 4) Due to the excellent design structure, there is no need to lock the circumferential rotational freedom of the heating element. The operator can easily complete the disassembly and replacement of the nozzle with one hand, saving time and effort. No heating is required during the installation of the nozzle, ensuring that the nozzle can be assembled stably and reliably, and there is no need to worry about the molten consumables overflowing through the assembly gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a three-dimensional schematic diagram of a fused deposition model 3D printer nozzle in the prior art.

[0022] Figure 2 It is a three-dimensional schematic diagram of the first embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention.

[0023] Figure 3 yes Figure 2 Front view of .

[0024] Figure 4 yes Figure 3 AA cross-sectional view.

[0025] Figure 5 yes Figure 3 BB cross-sectional view.

[0026] Figure 6 yes Figure 3 CC cross-sectional view.

[0027] Figure 7 This is a schematic diagram of the state after the capillary, heating body, nozzle and throat are assembled in the first embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention.

[0028] Figure 8 It is a three-dimensional schematic diagram of a capillary in the first embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention.

[0029] Figure 9 It is a three-dimensional schematic diagram of the heating body in the first embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention.

[0030] Figure 10 yes Figure 9 sectional view of .

[0031] Figure 11 It is a three-dimensional schematic diagram of the nozzle in the first embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention.

[0032] Figure 12 It is a three-dimensional schematic diagram of the heat sink in the first embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention.

[0033] Figure 13 yes Figure 12 Front view of .

[0034] Figure 14 It is a three-dimensional schematic diagram of the anti-torsion functional part in the first embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention from one perspective (the heating body is indicated in the form of double-dotted lines).

[0035] Figure 15 It is a three-dimensional schematic diagram of another perspective of the anti-torsion functional part in the first embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention (the heating body is indicated in the form of double-dotted lines).

[0036] Figure 16 It is a three-dimensional schematic diagram of a perspective of the anti-torsion plate in the first embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention.

[0037] Figure 17 This is a three-dimensional schematic diagram of another perspective of the anti-torsion plate in the first embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention.

[0038] Figure 18 It is a three-dimensional schematic diagram of the throat of the first embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention.

[0039] Figure 19 It is a three-dimensional schematic diagram of the insulation ring in the first embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention.

[0040] Figure 20 It is a three-dimensional schematic diagram of the second embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention.

[0041] Figure 21 yes Figure 20 Front view of .

[0042] Figure 22 yes Figure 21 DD cross-sectional view.

[0043] Figure 23 It is a three-dimensional schematic diagram of the plastic insulation cover in the second embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention.

[0044] 1-capillary tube; 2-heating body; 21-upper insertion slot; 22-lower insertion slot; 23-front limit slot; 24-rear limit slot; 3-nozzle; 4-heat sink; 41-casting body; 411-heat sink cavity; 412-upper installation cavity; 413-lower installation cavity; 414-avoidance notch; 42-fin-shaped heat sink unit; 421-short heat sink; 422-long heat sink; 5-anti-torsion function unit; 51-anti-torsion plate; 511-left Connecting section; 5111-left internal threaded hole; 512-center set section; 5121-through hole; 5122-front limiting boss; 5123-rear limiting boss; 5124-front arc-shaped limiting surface; 5125-rear arc-shaped limiting surface; 513-right connecting section; 5131-right internal threaded hole; 52-left bolt; 53-right bolt; 6-throat; 7-insulation ring; 8-plastic insulation sleeve; 81-sinking groove; 82-slit. DETAILED DESCRIPTION

[0045] In the description of the present invention, it should be understood that the terms "left", "right", "up", "down", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0046] The following is a detailed description of the present invention in conjunction with specific embodiments. Figure 2 、 Figure 3 、 Figure 4 The three-dimensional schematic diagram, front view and AA cross-sectional view of the first embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention are respectively shown. It can be seen that it is mainly composed of several parts such as a capillary 1, a heating body 2, a nozzle 3, a heat sink 4 and an anti-torsion functional part 5. Among them, the capillary 1, the heating body 2 and the nozzle 3 are connected in sequence, and their respective central axes coincide with each other, so as to form a consumable flow channel (such as Figure 7-11 As shown in ). Figure 9 、 10 As shown in the figure, the upper and lower ends of the heater 2 are formed with upper and lower insertion slots 21 and 22, respectively, for correspondingly inserting the capillary tube 1 and the nozzle 3. The heat sink 4 is used to accelerate the heat dissipation rate of the capillary tube 1 and is mounted on the periphery of the capillary tube 1. The heat sink 4 is preferably a lightweight aluminum casting with good heat dissipation properties. The anti-torsion function portion 5 serves as a connection and transition between the heater 2 and the heat sink 4. When the nozzle 3 is subjected to an unexpected force, the resulting bending and torsional moments are transmitted to the heat sink 4 via the anti-torsion function portion 5. During the specific 3D printing process, when the nozzle 3 is hit by an unexpected force, the anti-torsion function part 5 takes effect immediately, and the generated bending torque and torsional torque are immediately transmitted to the heat sink 4. At this time, the force-bearing body is converted into the heat sink 4 with high structural strength, thereby effectively improving the anti-collision ability of the fused deposition 3D printer nozzle, avoiding the occurrence of damage to the nozzle due to accidental impact force, and thus ensuring the molding quality of subsequent 3D printing and the smooth progress of the printing process.

[0047] As is known to all, according to common knowledge, the anti-torsion functional portion 5 can adopt a variety of design structures to achieve the transmission and transfer of torque. However, here we recommend an implementation scheme that is simple in design structure, easy to manufacture and implement, and has excellent force transmission stability, specifically: Figure 5 、 14 As shown in Figures 1 and 15 , the anti-torsion function unit 5 is primarily composed of a torsion plate 51, a left-mounted bolt 52, and a right-mounted bolt 53. The torsion plate 51 is penetrated by the heating element 2 and is removably connected to the heat sink 4 via the left-mounted bolt 52 and the right-mounted bolt 53. When the nozzle 3 is subjected to a lateral force, the movement and dynamics of the torsion plate 51 and the heat sink 4 remain consistent, and the resulting bending and torsional moments are sequentially transferred to the heat sink 4 via the nozzle 3, the torsion plate 51, and the bolt fastening unit (including the left-mounted bolt 52 and the right-mounted bolt 53).

[0048] Depend on Figure 4As shown in the figure, it can be clearly seen that the heating body 2 is not only used to circulate solid consumables, but is also directly used as the installation base of the nozzle 3. In addition, with the help of the anti-torsion functional part 5, even if the fused deposition printer is set to high-speed printing mode, the jitter amplitude and jitter frequency of the nozzle 3 can be maintained within a reasonable value range for a long time, ensuring that the 3D printed product has excellent molding quality.

[0049] Furthermore, similarly Figure 4 As shown in , compared with the traditional heating block design, the ratio of the design length of the heating body 2 to the overall length of the hot end is greatly increased, which means that the heating path of the hot end of the same length can be extended. In addition, the heating body 2 always maintains a high-power heat output state during the working process, so that the filament can be fully melted during the passing process, and there is less flow resistance during the circulation process. This, on the one hand, is conducive to ensuring the smooth progress of the extrusion process, and the filament extrusion amount is easy to match the feed speed of the 3D printer nozzle; on the other hand, since the filament is fully preheated in the process of flowing through the capillary 1 and is fully and thoroughly melted in the process of flowing through the heating body 2, it can avoid the occurrence of impurities in the filament continuously accumulating in the inner cavity of the nozzle 3 during a long printing process. This is conducive to ensuring the stability of the discharge speed of the nozzle 3 and can also effectively prevent the problem of the nozzle 3 being accidentally blocked.

[0050] Here, it is important to emphasize that, due to the excellent design structure, there is no need to lock the circumferential rotational freedom of the heating body 2, and ordinary workers can easily complete the disassembly and replacement of the nozzle 3. The entire operation process saves time and effort, and no process heating is required when installing the nozzle 3, which ensures that the nozzle 3 can be stably and reliably assembled, and there is no need to worry about the molten consumables overflowing through the assembly gap.

[0051] As a further refinement of the above technical solution, Figure 16 、 17 As shown in , along the left to right direction, the anti-torsion plate 51 is composed of a left connecting section 511, a middle sleeve section 512 and a right connecting section 513 in sequence. In the left connecting section 511 and the right connecting section 513, a left internal threaded hole 5111 and a right internal threaded hole 5131 are formed one by one correspondingly to each other, which are compatible with the above-mentioned left bolt 52 and right bolt 53. The middle sleeve section 512 is formed with a through hole 5121 for the heating body 2 to pass freely. In this way, on the one hand, by tightening the left bolt 52 and the right bolt 53, it is possible to quickly and effectively ensure that the assembled anti-torsion plate 51 occupies the correct relative position relative to the heat sink 4; on the other hand, under the coordinated action of the left bolt 52 and the right bolt 53, the heating body 2, the anti-torsion plate 51 and the heat sink 4 form an organic force-bearing body (such as Figure 5As shown in the figure, the bending moment and torsional moment can be transmitted instantly and reliably, thereby ensuring that the fused deposition model 3D printer nozzle has better anti-collision performance.

[0052] Furthermore, by Figure 14-17 As can be clearly seen in the figure, the top wall of the middle set section 512 continues to extend upward to form a front limiting boss 5122 and a rear limiting boss 5123, respectively, at the front and rear sides of the through hole 5121. Near its upper end, the front side wall of the heating body 2 is concave to form a front limiting groove 23 that matches the front limiting boss 5122, and its rear side wall is concave to form a rear limiting groove 24 that matches the rear limiting boss 5123. During the actual 3D printing process, when the nozzle 3 is hit by an unexpected force, the bending moment and torsional moment generated are first transmitted to the heating body 2, and then under the coordinated action of the paired front limit boss 5122 and the front limit groove 23 and the rear limit boss 5123 and the rear limit groove 24, the bending moment and torsional moment are again immediately and reliably transmitted to the anti-torsion plate 51, and finally transmitted to the heat sink 4 via the left bolt 52 and the right bolt 53.

[0053] In order to achieve the purpose of "foolproof" design, the rear limit boss 5123 has different design dimensions (such as Figure 16 、 17 ). In this way, the problem of the anti-torsion plate 51 being "reversely installed" or "misinstalled" relative to the heating body 2 during the assembly operation by the worker is effectively avoided.

[0054] In order to further improve the heat dissipation performance of the heat sink 4, as a further optimization of the above technical solution, as follows Figure 12 、 13 As shown in , the heat sink 4 is preferably composed of a casting body 41 and fin-shaped heat sink units 42. The fin-shaped heat sink units 42 are composed of short heat sink fins 421 and long heat sink fins 422, which are used in pairs. The short heat sink fins 421 extend from the left side wall of the casting body 41 to the left. There are four of them, which are arranged linearly along the length of the casting body 41. The long heat sink fins 422 extend from the right side wall of the casting body 41 to the right. There are also four of them, which are also arranged linearly along the length of the casting body 41. A heat sink cavity 411 is formed in the casting body 41.

[0055] Depend on Figure 2 、 3 As shown in Figure 4, it can be clearly seen that the nozzle of the fused deposition 3D printer is also equipped with a throat 6 and a heat preservation ring 7. Among them, the throat 6 is sleeved on the periphery of the capillary 1, and the heat sink 4 is used as the insertion basis (as shown in Figure 4). Figure 7As shown in ). The heat preservation ring 7 is mounted on the periphery of the heating body 2 in a free floating manner, and the anti-torsion plate 51 is used as a drop base (as shown in Figure 6 、 19 As shown in ). Figure 12 、 13 As shown in , an upper mounting cavity 412 and a lower mounting cavity 413 are formed in the casting body 41, which are used to respectively accommodate the throat 6 and the insulation ring 7. By adopting the above technical solution, the heat conduction path between the heat sink 4 and the capillary 1 is blocked by the throat 6, and the heat conduction path between the heating body 2 and the heat sink 4 is blocked by the insulation ring 7, thereby facilitating the directionally conducted heat generated by the heating body 2, effectively improving the heat utilization rate. In addition, the capillary 1 quickly dissipates heat with the help of the heat sink 4, thereby effectively avoiding the volume expansion or even premature melting of the solid consumables due to the effect of excessive heat during the process of flowing through the capillary 1, thereby ensuring that the molten consumables have excellent extrusion accuracy.

[0056] As is known, in the actual assembly process, the throat 6 is first mounted on the capillary 1, and the capillary 1 passes through the heat sink 4 longitudinally and is mainly positioned and held radially by the throat 4. Figure 4 、 18 As shown in , the throat tube 6 is generally conical in shape, smaller at the top and larger at the bottom. This, on the one hand, relaxes the requirements for the initial assembly positioning accuracy of the throat tube 6, thereby reducing its assembly difficulty to a certain extent. Furthermore, the throat tube 6 has a self-locking function, and after assembly, it has good position stability relative to the heat sink 4 and will not become loose due to the action of excitation forces. On the other hand, as the throat tube 6 penetrates deeper into the heat sink 4, the outer wall of the capillary tube 1 is continuously subjected to a holding force, and as the penetration process continues, the holding force adaptively increases, ensuring that the capillary tube 1 always occupies the correct installation position relative to the heat sink 4 throughout its designed life cycle.

[0057] Figure 20 、 Figure 21 、 Figure 22 The following diagrams show a perspective schematic diagram, a front view, and a DD cross-sectional view of the second embodiment of the fused deposition model 3D printer nozzle disclosed in the present invention. It can be seen that the difference between the second embodiment and the first embodiment is that a plastic insulation sleeve 8 is provided around the periphery of the heating element 2 to block the heat conduction path between the heating element 2 and the external environment, and is penetrated by an anti-torsion plate 51. By adopting the above technical solution, on the one hand, a large amount of unnecessary loss of heat generated by the heating element 2 is avoided, thereby helping to improve the heat utilization efficiency to a certain extent; a safety protection is formed for the heating element 2, preventing workers from being burned by accidental touch; and on the other hand, the heating element 2 is prevented from being damaged by direct collision.

[0058] Depend on Figure 23 As can be clearly seen in the figure, the top wall of the plastic insulation sleeve 8 continues downward to form a sink 81 with a shape that matches the middle sleeve section 512, for receiving the anti-torsion plate 51. To ensure that the anti-torsion plate 51 maintains good positioning accuracy relative to the plastic insulation sleeve 8 after installation, the front and rear side walls of the middle sleeve section 512 are respectively formed with a front arcuate limiting surface 5124 and a rear arcuate limiting surface 5125.

[0059] Finally, it should be noted that if Figure 23 As shown in FIG, the plastic insulation sleeve 8 is further formed with a slit 82. Slit 82 extends forward from the front sidewall of the sinking trough 81 and penetrates the front sidewall of the sinking trough 81. During the installation of the anti-torsion plate 51 into the sinking trough 81, the inner sidewall of the sinking trough 81 is subjected to lateral pushing force, and the slit 82 adaptively changes. This not only effectively reduces the difficulty of installing the anti-torsion plate 51, but also ensures the stability and reliability of the anti-torsion plate 51 once installed.

[0060] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fused deposition model 3D printer nozzle, comprising a capillary, a heater, a nozzle, and a heat sink; the capillary, the heater, and the nozzle are sequentially connected, and their respective central axes coincide with each other, thereby forming a consumable material circulation channel; the heat sink is used to accelerate the heat dissipation rate of the capillary and is sleeved on the periphery of the capillary, characterized in that: It also includes an anti-torsion functional part; the anti-torsion functional part serves as a connection transition between the heating body and the heat sink; the anti-torsion functional part includes an anti-torsion plate, the anti-torsion plate is penetrated by the heating body, and is detachably connected to the heat sink. When the nozzle is subjected to lateral force, the movement trend and dynamics of the anti-torsion plate and the heat sink remain consistent.

2. The fused deposition model 3D printer nozzle according to claim 1, characterized in that: The anti-torsion functional part further includes a left-positioned bolt and a right-positioned bolt; the anti-torsion plate is detachably connected to the heat sink by means of the left-positioned bolt and the right-positioned bolt.

3. The fused deposition model 3D printer nozzle according to claim 2, characterized in that: The anti-torsion plate is composed of a left-placed connecting section, a central-placed sleeve section and a right-placed connecting section in sequence; a left-placed internal threaded hole and a right-placed internal threaded hole are formed in the left-placed connecting section and the right-placed connecting section respectively, and the left-placed internal threaded hole and the right-placed internal threaded hole are formed in a one-to-one correspondence with each other, and the central-placed sleeve section is formed with a through hole for the heating body to pass freely.

4. The fused deposition model 3D printer nozzle according to claim 3, characterized in that: Located on the front and rear sides of the through hole, the top wall of the middle set section continues to extend upward to form a front limit boss and a rear limit boss respectively; near its upper end, the front side wall of the heating body is concave to form a front limit groove that is compatible with the front limit boss, and its rear side wall is concave to form a rear limit groove that is compatible with the rear limit boss.

5. The fused deposition model 3D printer nozzle according to claim 4, characterized in that: The front limiting boss and the rear limiting boss have different design structures and / or design dimensions.

6. The fused deposition model 3D printer nozzle according to any one of claims 1 to 5, characterized in that: It also includes a throat; the throat is used to block the heat conduction path between the heat sink and the capillary tube, is sleeved on the periphery of the capillary tube, and uses the heat sink as an insertion basis.

7. The fused deposition model 3D printer nozzle according to any one of claims 2 to 5, characterized in that: It also includes a heat preservation ring; the heat preservation ring is used to block the heat conduction path between the heating body and the heat sink, and is freely floatingly sleeved on the periphery of the heating body, and the anti-torsion plate is used as a drop base.

8. The fused deposition model 3D printer nozzle according to any one of claims 1 to 5, characterized in that: The heat sink is an aluminum casting, which consists of a casting body and a fin-shaped heat sink unit, and a heat sink cavity is formed in the casting body.

9. The fused deposition model 3D printer nozzle according to claim 8, characterized in that: The fin-shaped heat dissipation unit is composed of short heat dissipation fins and long heat dissipation fins used in groups; wherein, the short heat dissipation fins are formed by continuing to extend to the left from the left side wall of the casting body, the number of which is set to N, and are linearly arranged along the length direction of the casting body; the long heat dissipation fins are formed by continuing to extend to the right from the right side wall of the casting body, the number of which is set to N, and are also linearly arranged along the length direction of the casting body.

10. The fused deposition model 3D printer nozzle according to any one of claims 2 to 5, characterized in that: It also includes a plastic insulation sleeve; the plastic insulation sleeve is used to block the heating body from the external environment, is sleeved on the periphery of the heating body, and is penetrated by the anti-torsion plate.

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