CN221067201U - Nozzle, printing head assembly and three-dimensional forming equipment - Google Patents

Abstract

The utility model discloses a nozzle, a printing head assembly and three-dimensional forming equipment, wherein an external sleeve with higher hardness is arranged opposite to a printing platform, so that the wear resistance of a consumable part in a consumable part channel at a position with higher consumable part speed is improved, and the internal sleeve can ensure high heat conduction performance and avoid overheating and material leakage of consumable parts. The main technical scheme of the utility model is that the nozzle comprises: the inner sleeve is provided with a first consumable channel, and the first consumable channel penetrates through the first end and the second end of the inner sleeve; the outer sleeve is provided with a second consumable channel, the first end of the outer sleeve is used for being opposite to a printing platform of the three-dimensional forming equipment, the second consumable channel penetrates through at least the first end of the outer sleeve, the outer sleeve is connected with the inner sleeve, and the first consumable channel is communicated with the second consumable channel to conduct consumables; the hardness of the outer sleeve is greater than that of the inner sleeve, and the heat conduction coefficient of the outer sleeve is smaller than that of the inner sleeve. The utility model is mainly used for spraying consumable materials.

Description

Nozzle, printing head assembly and three-dimensional forming equipment

Technical Field

The utility model relates to the technical field of 3D printing, in particular to a nozzle, a printing head assembly and three-dimensional forming equipment.

Background

In the printing process of the three-dimensional forming equipment, the extruder transmits consumable materials to the printing head, the power structure drives the forming platform and the printing head to move relatively, the printing head melts the consumable materials, the melted consumable materials are sprayed to the forming platform through the nozzles, and the material consumable materials are cooled and solidified layer by layer on the forming platform to realize three-dimensional printing. The degree of melting of the consumable in the printhead and the temperature ejected by the nozzles directly affect the molding quality of the mold.

In the prior art, the nozzle is made of a single metal material, such as copper or steel, and the steel nozzle has higher wear resistance than the copper nozzle, such as in the patent with publication number CN207290937U, the detachable nozzle assembly comprises a stainless steel pipe nozzle, a temperature control device, and the like, and the temperature control device surrounds the stainless steel pipe nozzle for heating. But the nozzle adopting the steel material has poor heat conduction performance, needs to improve the heating temperature of consumable, and easily causes the phenomenon of material leakage caused by overhigh temperature of the consumable.

Disclosure of utility model

In view of the foregoing, the present utility model provides a nozzle, a printhead assembly and a three-dimensional forming apparatus, which are mainly used for solving the problem that wear resistance and high thermal conductivity cannot be achieved.

In order to achieve the above purpose, the present utility model mainly provides the following technical solutions:

in one aspect, the present utility model provides a nozzle for a stereolithography apparatus, the nozzle comprising:

The inner sleeve is provided with a first consumable channel, and the first consumable channel penetrates through the first end and the second end of the inner sleeve;

The outer sleeve is provided with a second consumable channel, the first end of the outer sleeve is used for being opposite to a printing platform of the three-dimensional forming equipment, the second consumable channel penetrates through at least the first end of the outer sleeve, the outer sleeve is connected with the inner sleeve, and the first consumable channel is communicated with the second consumable channel to conduct consumables;

the hardness of the outer sleeve is greater than that of the inner sleeve, and the heat conduction coefficient of the outer sleeve is smaller than that of the inner sleeve.

In another aspect, embodiments of the present utility model also provide a printhead assembly including a nozzle according to any one of the preceding claims, an

The heating assembly is provided with a third consumable channel, the third consumable channel penetrates through the first end and the second end of the heating assembly, the nozzle is connected with the heating assembly, and the first consumable channel is communicated with the third consumable channel;

The heating component is used for generating heat.

In yet another aspect, embodiments of the present utility model also provide a stereolithography apparatus, comprising a printhead assembly according to any one of the preceding claims.

According to the nozzle, the printing head assembly and the three-dimensional forming equipment, the outer sleeve with higher hardness is arranged to be opposite to the printing platform, so that the wear resistance of the consumable material in the consumable material channel at the position with higher consumable material speed is improved, the inner sleeve can ensure high heat conduction performance, and the consumable material is prevented from being excessively heated and leaking. In the prior art, the nozzle is made of a single metal material, such as copper or steel, and the steel nozzle has higher wear resistance compared with a copper nozzle, but the nozzle made of the steel material has poor heat conduction performance, the heating temperature of the nozzle needs to be improved, and the material leakage phenomenon is easily caused by overhigh consumable temperature. Compared with the prior art, in the file of the utility model, the outer sleeve piece is used for being opposite to the printing platform, the consumable material has higher speed at the position close to the first end in the outer sleeve piece, the wear degree of the outer sleeve piece is improved by improving the hardness of the outer sleeve piece, the inner sleeve piece can still adopt the material with better heat conduction performance, the heating temperature of the consumable material is not required to be improved, and the material leakage is avoided. Meanwhile, by reducing the heat conduction coefficient of the outer sleeve, the outer sleeve has the functions of wear resistance and service life of the nozzle, has a heat preservation function and slows down the temperature loss of the inner sleeve.

Drawings

FIG. 1 is a schematic view of a nozzle according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a nozzle according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a printhead assembly according to an embodiment of the present utility model at a first viewing angle;

FIG. 4 is a schematic diagram of a printhead assembly according to an embodiment of the present utility model at a second viewing angle;

FIG. 5 is a schematic diagram of a printhead assembly according to an embodiment of the present utility model at a third view;

FIG. 6 is a schematic cross-sectional view of the printhead assembly of FIG. 3 at A-A;

FIG. 7 is a schematic cross-sectional view of an exploded printhead assembly according to an embodiment of the present utility model;

FIG. 8 is an exploded view of a printhead assembly according to an embodiment of the present utility model at a first viewing angle;

FIG. 9 is an exploded view of a printhead assembly according to an embodiment of the present utility model at a second viewing angle;

Fig. 10 is a schematic structural diagram of a part of a structure of a stereoscopic molding apparatus according to an embodiment of the present utility model at a first view angle;

fig. 11 is a schematic structural diagram of a part of a structure of a stereoscopic forming apparatus according to an embodiment of the present utility model at a second view angle;

Fig. 12 is a schematic structural view of a part of a structure of a stereoscopic molding apparatus according to an embodiment of the present utility model at a third view angle;

Fig. 13 is a schematic sectional view of a part of the structure of the stereolithography apparatus shown in fig. 12 at B-B.

Detailed Description

In order to further describe the technical means and effects adopted by the utility model to achieve the preset aim, the following detailed description is given of the specific implementation, structure, characteristics and effects of the nozzle according to the utility model with reference to the accompanying drawings and the preferred embodiments.

In one aspect, as shown in FIGS. 1-6, an embodiment of the present utility model provides a nozzle for a stereolithography apparatus, the nozzle 10 comprising:

the inner sleeve 100, the inner sleeve 100 is provided with a first consumable channel 110, and the first consumable channel 110 penetrates through a first end and a second end of the inner sleeve 100;

The outer sleeve 200, the outer sleeve 200 is provided with a second consumable channel 210, the first end of the outer sleeve 200 is used for being opposite to the printing platform of the three-dimensional forming equipment, the second consumable channel 210 at least penetrates through the first end of the outer sleeve 200, the outer sleeve 200 is connected with the inner sleeve 100, and the first consumable channel 110 is communicated with the second consumable channel 210 to conduct consumables;

The hardness of the outer sleeve 200 is greater than that of the inner sleeve 100, and the thermal conductivity of the outer sleeve 200 is less than that of the inner sleeve 100.

The stereolithography apparatus generally includes a support power structure, a printhead assembly 30, a print platform, and an extruder, the support power structure connecting the printhead assembly 30 and the print platform, the nozzle 10 being used in the printhead assembly 30 of the stereolithography apparatus, the nozzle 10 being opposite the print platform, the support power structure being used to drive the printhead assembly 30 and the print platform to move relative to each other. The printhead assembly 30 also typically includes a heater assembly 300, and the extruder continuously outputs consumable materials that first enter the heater assembly 300 to heat and melt and then spray in a molten state through the nozzles 10 toward the print platen. The second consumable channel 210 is closer to the printing platform than the first consumable channel 110, and after the consumable is melted in the printhead assembly 30, the consumable will sequentially pass through the first consumable channel 110 and the second consumable channel 210 and be ejected through the bottom opening of the second consumable channel 210. For making the consumptive material can be sprayed smoothly fast, and the diameter is thin enough when guaranteeing the consumptive material blowout, guarantees the printing precision, and the pressure and the moving speed of consumptive material are also faster in other regions and first consumptive material passageway 110 that are close to printing platform's at least partial region of second consumptive material passageway 210 are thinner than second consumptive material passageway 210. Hardness through external member 200 is greater than hardness of internal member 100 for the inner wall of second consumptive material passageway 210 is more wear-resisting, can bear the frequent high pressure of consumptive material and the friction that high-speed removed, and difficult wearing and tearing of using for a long time guarantees nozzle 10's life. And the internal sleeve 100 can be made of different materials from the external sleeve 200, such as a material with better heat conduction performance can be used, for example, the internal sleeve 100 can be made of copper, so that the heat conduction performance is guaranteed, the first consumable channel 110 is kept at a high temperature, the consumable is ensured to be kept at a higher temperature after entering the nozzle 10 by the heating component 300, the temperature of the heating component 300 is not required to be increased, the melting degree of the consumable is ensured to be moderate, and the consumable can be discharged smoothly without excessive melting and dripping.

The connection mode of the inner sleeve 100 and the outer sleeve 200 can be various, such as embedded plugging, screwing or back extrusion fixation. The materials of the inner sleeve 100 and the outer sleeve 200 can be various, and the material can be selected from the existing materials to ensure high heat conduction of the inner sleeve 100, and the outer sleeve 200 is more wear-resistant.

According to the nozzle, the printing head assembly and the three-dimensional forming equipment, the outer sleeve with higher hardness is arranged to be opposite to the printing platform, so that the wear resistance of the consumable material in the consumable material channel at the position with higher consumable material speed is improved, the inner sleeve can ensure high heat conduction performance, and the consumable material is prevented from being excessively heated and leaking. In the prior art, the nozzle is made of a single metal material, such as copper or steel, and the steel nozzle has higher wear resistance compared with a copper nozzle, but the nozzle made of the steel material has poor heat conduction performance, the heating temperature of the nozzle needs to be improved, and the material leakage phenomenon is easily caused by overhigh consumable temperature. Compared with the prior art, in the file of the utility model, the outer sleeve piece is used for being opposite to the printing platform, the consumable material has higher speed at the position close to the first end in the outer sleeve piece, the wear degree of the outer sleeve piece is improved by improving the hardness of the outer sleeve piece, the inner sleeve piece can still adopt the material with better heat conduction performance, the heating temperature of the consumable material is not required to be improved, and the material leakage is avoided.

The outer sleeve 200 has a function of wear resistance and guaranteeing the service life of the nozzle 10, and the outer sleeve 200 also has a function of heat preservation. Specifically, in one embodiment, the thermal conductivity of the outer sleeve 200 is less than the thermal conductivity of the inner sleeve 100.

The external member 200 has low heat conduction performance, and can reduce the cooling speed of the melted consumable in the second consumable channel 210, especially for the three-dimensional molding device with the model heat dissipation component. The model heat dissipation assembly is used for blowing air to the discharging position of the nozzle 10, so that consumable materials sprayed and coated by the nozzle 10 can be rapidly cooled and molded, and molding quality of the model can be improved. However, the air flow of the model heat dissipation assembly will also affect the nozzle 10, and by adopting the outer sleeve member 200 with small heat conductivity coefficient, the heat preservation effect in the second consumable part channel 210 can be realized, so that wear resistance and heat preservation are both considered. In some embodiments, the material of the outer sleeve 200 may be steel and the material of the inner sleeve 100 may be copper. The steel material has higher hardness, and the abrasion resistance of the inner wall of the second consumable part channel 210 is realized. The heat conductivity of 45# steel at 0-300 ℃ is 52.3W/m.k to 41.87W/m.k. The copper material has high thermal conductivity, which is beneficial to the rapid temperature rise of the inner sleeve 100 and ensures the high temperature in the first consumable channel 110. For example, the heat conductivity of red copper is 398W/m.k to 379W/m.k under the environment of 0-300 ℃, and the heat conductivity of brass is 100W/m.k to 130W/m.k under the environment of 0-300 ℃. The red copper preparation inner sleeve 100 can be preferably selected, and the high heat conduction and low heat conduction matching of the steel outer sleeve 200 can realize that the consumable materials in the first consumable channel 110 and the second consumable channel 210 can keep enough temperature without the need of heating the heating assembly 300 at an excessive temperature.

In one embodiment, the radial cross-sectional area of the second consumable channel 210 includes a decreasing trend in a direction toward the first end of the outer sleeve 200. Through the attenuation of consumptive material passageway, realize the quick even extrusion formula blowout of consumptive material ability, and guarantee model precision. The thickness of the second consumable channel 210 may be uniformly tapered in a direction approaching the printing platform, or may be varied stepwise. More specifically, the second consumable channel 210 includes an upper channel 211, a transition channel 212 and a lower channel 213, one end of the upper channel 211 is communicated with the first consumable channel 110, the other end of the upper channel 211 is communicated with one end of the transition channel 212, the other end of the transition channel 212 is communicated with one end of the lower channel 213, and the other end of the lower channel 213 is communicated with the first end of the external member 200. The radial cross-sectional area of the lower-stage passage 213 is smaller than the radial cross-sectional area of the upper-stage passage 211, and the radial cross-sectional area of the transition passage 212 gradually decreases in a direction approaching the lower-stage passage 213.

The inner wall of the transition channel 212 is tapered, and the consumable is restricted at the transition channel 212, and then the pressure is increased, and the consumable is rapidly extruded from the lower channel 213. The inner diameter of the lower section channel 213 is uniform, and the consumable extrusion direction is stable. The radial cross-sectional area of the upper section channel 211 may be equal to the radial cross-sectional area of the first consumable channel 110. The problem that the consumable is accumulated or the flow speed suddenly changes to cause unsmooth flow due to the fact that the sudden change of the connecting positions of the upper section channel 211 and the first consumable channel 110 is avoided, and the problem of leakage of the connecting positions of the upper section channel 211 and the first consumable channel 110 can be avoided to a certain extent due to smooth transition of the connecting positions.

The outer sleeve 200 and the inner sleeve 100 may be connected in a nested manner, for example, in one embodiment, the outer sleeve 200 is further provided with a nesting hole 220, one end of the nesting hole 220 is communicated with the second consumable channel 210, and the other end of the nesting hole 220 penetrates through the second end of the outer sleeve 200. The outer sleeve 200 is sleeved on the outer periphery of the inner sleeve 100 through the sleeve hole 220 so that the first consumable channel 110 is communicated with the second consumable channel 210.

By adopting a nesting mode, on one hand, the sleeve piece 200 can be connected with the heating assembly 300, the hardness of the sleeve piece 200 is high, and the abrasion caused by frequent disassembly and assembly of the heating assembly 300 can be reduced; on the other hand, the outer sleeve 200 plays a role in heat preservation of the inner sleeve 100, avoids heat dissipation on the inner sleeve 100, and further ensures the temperature in the first consumable part channel 110.

In one embodiment, the radial cross-sectional area of the second consumable channel 210 is smaller than the radial cross-sectional area of the nest aperture 220, and the engagement location of the second consumable channel 210 with the nest aperture 220 forms the first sealing land 230. The first end of the inner sleeve 100 is opposite the first sealing land 230 and the second end of the inner sleeve 100 is located outside the nest bore 220. The second end of the inner sleeve 100 is adapted to receive an external force such that the first end of the inner sleeve 100 is sealed against the first sealing land 230.

The second end of the inner member 100 is adapted to receive an external force from the heating assembly 300 when the nozzle 10 is coupled to the heating assembly 300. The inner and outer sets 100 and 200 are secured by external force compression, as will be further described below in connection with embodiments of the heating assembly 300. Further, the nesting hole 220 and the inner sleeve 100 may be in transition fit, the inner sleeve 100 and the outer sleeve 200 may generate thermal expansion and contraction during printing, the nesting hole 220 and the inner sleeve 100 may be in transition fit, the maximum limit outer diameter of the inner sleeve 100 is larger than the minimum limit inner diameter of the nesting hole 220, and the minimum limit outer diameter of the inner sleeve 100 is smaller than the maximum limit inner diameter of the nesting hole 220, so that the inner sleeve 100 and the outer sleeve 200 are easy to assemble, and expansion can be achieved during printing to further increase the stability of limiting each other.

In one embodiment, the second end of the inner sleeve 100 is provided with a stress boss 120, the stress boss 120 protrudes from the side wall of the inner sleeve 100, and a preset distance a is formed between the stress boss 120 and the second end face of the outer sleeve 200.

The stress protrusion 120 can increase the force application area of the second end of the inner member 100 and the heat conduction area. The preset distance a is a reserved space for thermal expansion and contraction, so that the inner sleeve 100 can be tightly propped against the sealing table top 230 of the outer sleeve 200 under the force of the heating assembly 300. The preset distance a is related to the materials of the inner sleeve 100 and the outer sleeve 200, for example, the preset distance a is greater than or equal to 0.5 mm, so that enough space is ensured to release deformation, and the preset distance a is less than or equal to 0.8 mm, so that the heat transfer is prevented from being greatly influenced by the space due to overlong distance. For example, the preset distance a may be 0.6 mm and 0.7 mm.

On the other hand, as shown in fig. 3-9, an embodiment of the present utility model further provides a printhead assembly 30, including the nozzle 10 of any one of the foregoing embodiments, and a heating assembly 300, where the heating assembly 300 is provided with a third consumable channel 310, the third consumable channel 310 penetrates through a first end and a second end of the heating assembly 300, the nozzle 10 is connected to the heating assembly 300, and the first consumable channel 110 is in communication with the third consumable channel 310. The heating assembly 300 is used for generating heat.

The third consumable channel 310 is a melting position of consumable materials, and the consumable materials are fed into the third consumable channel 310 by an extruder, changed into a molten state under the heating of the heating assembly 300, and then transferred to the first consumable channel 110 and ejected through the second consumable channel 210.

The nozzle 10 may be coupled to the heating assembly 300 in a variety of configurations, such as by an embedded threaded connection. Specifically, the third consumable channel 310 includes a connection section 311 and a melting section 312, the connection section 311 is located at two end sections of the third consumable channel 310, the melting section 312 is located at an intermediate section of the third consumable channel 310, one end of the connection section 311 is communicated with the melting section 312, the other end of the connection section 311 is communicated with the first end of the heating assembly 300, and the nozzle 10 is inserted into the connection section 311 and connected with the heating assembly 300. The inner wall of the connection section 311 is provided with a first internal thread and the outer wall of the outer sleeve 200 is provided with a first external thread. The radial cross-sectional area of the connecting section 311 is larger than that of the melting section 312, the joint position of the connecting section 311 and the melting section 312 forms a second sealing platform 313, the inner sleeve 100 is opposite to the second sealing platform 313, and the nozzle 10 is in threaded connection with the heating assembly 300 through the threaded fit of the first internal threads and the first external threads, so that the inner sleeve 100 is in abutting sealing with the second sealing platform 313.

By adopting the threaded connection mode, compared with the interference mode assembly, the external sleeve 200 is prevented from falling due to insufficient interference caused by thermal expansion and cold contraction, the requirement on processing precision is low, and the cost can be saved. In the previous embodiment in which the inner sleeve 100 includes the force-bearing boss 120, the outer sleeve 200 is screwed, and the outer sleeve 200 moves the inner sleeve 100 upward to be close to the second sealing land 313. Continuing to screw the outer sleeve 200, the force-bearing boss 120 will abut against the second sealing land 313, the second sealing land 313 applies an external force to the force-bearing boss 120, and the first end of the inner sleeve 100 will abut against the first sealing land 230, thereby realizing the sealing between the inner sleeve 100 and the heating assembly 300, and between the inner sleeve 100 and the outer sleeve 200.

In some embodiments, the radial cross-sectional area of the first consumable channel 110 is equal to the radial cross-sectional area of the melt section 312. Avoiding abrupt change of the joint position of the melting section 312 and the first consumable channel 110 results in accumulation of consumable materials or abrupt change of flow velocity results in unsmooth flow, the smooth transition of the joint position can avoid the leakage problem of the joint position of the first consumable channel 110 and the melting section 312 to a certain extent.

The heating assembly 300 may have various structures and is intended to heat the third consumable part channel 310. In one mode, heating is achieved by inserting heating pipes into the heating blocks 320 of the heating assembly 300; in another embodiment, the heating assembly 300 includes a heating block 320, a heating plate 330 and a fixing member 340, the heating block 320 is provided with a third consumable channel 310, the nozzle 10 is connected with the heating block 320, the heating plate 330 is connected with the heating block 320 through the fixing member 340, the heating plate 330 is used for heating, and the heating block 320 is used for conducting heat.

The heating block 320 may have an approximate square structure, and the heating block 320 has better thermal conductivity, so that the thermal conductivity and the cost are both considered, and the heating block 320 may be made of brass. The heating plate 330 may have a plate structure, and the heating plate 330 is abutted against the surface of the heating block 320, so that the heating area can be increased, and the heating efficiency is higher; meanwhile, compared with a heating mode of inserting a heating pipe, the volume of the heating block 320 can be greatly reduced, so that the overall weight of the printing head is reduced, and the printing speed is improved. The heating sheet 330 may be a ceramic heating sheet or a metal sheet. In some embodiments, the fixing member 340 fixes the heating block 320 and the heating plate 330 in a clamping manner. Specifically, the fixing member 340 includes a connecting plate 341 and two spring arms 342, where the two spring arms 342 are disposed opposite to each other at intervals and are connected to the connecting plate 341, and one ends of the two spring arms 342 away from the connecting plate 341 can spring mutually. The heating block 320 and the heating plate 330 are abutted, and the two elastic arms 342 are used for respectively clamping the heating block 320 and the heating plate 330 by the opposite sides of the heating block 320 and the heating plate 330, so that the heating block 320 and the heating plate 330 are relatively fixed. Grooves 321 can be arranged on two opposite sides of the heating block 320, one side of the groove 321 is used for being embedded into the heating piece 330, the other side of the groove 321 is used for being embedded into the elastic arm 342 of the opposite heating piece 330, and the groove is used for assisting in fixing the heating piece 330 and guiding and limiting the fixing piece 340.

The fixing member 340 may also have other clamping manners, such as that the heating plate 330 abuts against the first side of the heating block 320, or that the first side of the heating block 320 is provided with a groove 321, and the heating plate 330 is embedded in the groove 321. The two spring arms 342 are used for clamping the heating block 320 by the second side of the heating block 320 and the third side of the heating block 320 respectively, and the connecting plate 341 is opposite to the heating plate 330 and abuts against the heating plate 330, so that the heating block 320 and the heating plate 330 are relatively fixed. The second side of the heating block 320 and the third side of the heating block 320 are opposite sides from the first side of the heating block 320.

In one embodiment, the printhead assembly 30 further includes a temperature sensing member 400, the temperature sensing member 400 being coupled to the heating block 320 of the heating assembly 300 to sense the temperature of the heating block 320. The temperature measuring piece 400 is electrically connected with a main controller of the three-dimensional forming equipment, the detected temperature of the heating block 320 is sent to the main controller, and then the main controller is used for conducting power-on control on the heating plate 330 according to the temperature so as to control the temperature of the heating block 320 to heat consumable materials.

Further, the heating block 320 of the heating assembly 300 is provided with a temperature measuring hole 350, and the temperature measuring member 400 is at least partially located in the temperature measuring hole 350. The temperature measuring hole 350 is formed on the side wall of the heating block 320, and the temperature of the space in the temperature measuring hole 350 is closer to the actual temperature of the heating block 320 than the surface of the heating block 320, so that the temperature measuring piece 400 can more accurately detect the temperature of the heating block 320. The temperature measuring member 400 may be a thermistor.

In one embodiment, the printhead assembly 30 further includes a throat 500, the throat 500 defining a fourth consumable channel 510, the fourth consumable channel 510 extending through the first and second ends of the throat 500. The throat 500 is inserted into the third consumable channel 310 from the first end. The inner wall of the third consumable channel 310 is provided with a second internal thread, the outer wall of the throat 500 is provided with a second external thread, and the throat 500 is in threaded connection with the heating assembly 300 through the cooperation of the second internal thread and the second external thread.

The throat 500 functions to allow the consumable to smoothly enter the third consumable channel 310. In order to avoid the phenomenon that the consumable is bent or expanded in the fourth consumable channel 510 and blocked when the extruder extrudes the consumable forward, it is necessary to ensure that the consumable does not heat up or does not heat up to a softening degree in the fourth consumable channel 510, and it is necessary to ensure that the heat of the heating block 320 is transferred to the throat 500 as little as possible. In order to achieve the above objective, in one embodiment, the throat 500 is made of titanium alloy TC4, and has an extremely low thermal conductivity, so that heat of the heating block 320 can be effectively blocked from being transferred to the throat 500, and the consumable material is prevented from being too high in temperature in the fourth consumable material channel 510, so that the blocking risk of the fourth consumable material channel 510 is reduced.

In one embodiment, the printhead assembly 30 further includes a transition tube 600 and a heat sink 700, the transition tube 600 having a fifth consumable channel 610 formed therein, the fifth consumable channel 610 extending through the first and second ends of the transition tube 600. The heat sink 700 is provided with mounting holes 710, and the mounting holes 710 penetrate through the first end and the second end of the heat sink 700. The throat 500 is inserted into the mounting hole 710 from the second end, the transition tube 600 is inserted into the mounting hole 710 from the first end, the second end of the transition tube 600 is located outside the mounting hole 710, and the fifth consumable channel 610 is communicated with the fourth consumable channel 510.

The transition tube 600 may be a teflon tube, and the teflon material has characteristics of heat resistance, smoothness and difficult adhesion, so that the consumables can smoothly pass through the fifth consumable channel 610 and be transferred to the fourth consumable channel 510. The transition pipe 600 and the throat pipe 500 may be directly connected to each other, such as by plugging ends. The heat dissipation block 700 is used for dissipating heat of the throat 500 and the transition tube 600, ensuring low temperature in the fourth consumable channel 510 and the fifth consumable channel 610, and avoiding consumable melting caused by temperature rise.

The connection between the throat 500 and the heat dissipating block 700 may be various, in order to ensure stability and heat conduction efficiency, in one embodiment, the printhead assembly 30 further includes two jackscrews 800, where the two jackscrews 800 may be two, the heat dissipating block 700 is provided with two jackscrew holes 720, the jackscrew holes 720 penetrate through the mounting hole 710, and the jackscrews 800 penetrate through the jackscrew holes 720 and press and fix the throat 500.

Further, the printhead assembly 30 further includes a throat radiator fan 910, the heat sink 700 includes a heat sink main body 730 and a plurality of heat sinks 740, the mounting hole 710 is formed in the heat sink main body 730, and the plurality of heat sinks 740 are arranged in parallel and connected to the heat sink main body 730. The throat heat dissipation fan 910 is connected to the heat dissipation block main body 730 and is opposite to the heat dissipation fins 740.

The cooling fan 910 is used to accelerate the airflow around the cooling fins 740, so that the cooling of the cooling fins 740 is faster, and the effective cooling of the throat 500 and the transition pipe 600 is achieved.

In one embodiment, the printhead assembly 30 further includes a housing 20, the housing 20 including a receiving cavity, the housing 20 defining a top opening and a relief opening in communication with the receiving cavity, the top opening and the relief opening being disposed opposite one another. The outer casing 20 covers at least the outer periphery of the nozzle 10 and the heating assembly 300 through the top opening, and the first end of the outer sleeve 200 extends out of the accommodating cavity from the abdication opening.

The housing 20 may be secured to the periphery of the nozzle 10 and the heating assembly 300 in a variety of ways, such as by snap fit or by resilient deformation of the top opening. The housing 20 may be made of plastic, and has a certain heat-insulating effect, and an effect of preventing the heating assembly 300 and the nozzle 10 from being scalded due to false touch. The first end of the external member 200 extends out of the accommodating cavity from the abdication opening for spraying melted consumable materials to the printing platform.

In yet another aspect, embodiments of the present utility model also provide a stereolithography apparatus comprising a printhead assembly 30 according to any one of the preceding claims.

The three-dimensional forming equipment further comprises an equipment main body, wherein the equipment main body comprises a supporting seat, a printing platform, a Z-axis power structure, a Z-axis support, a Y-axis power structure and an X-axis power structure, and the X-axis power structure comprises an X-axis driving piece, an X-axis section bar and a supporting frame. The support frame is connected to the X-axis section bar in a rolling way and is connected with the X-axis driving piece. The heat sink 700 may be directly connected to the support frame using bolts, or in some embodiments, the stereolithography apparatus includes an extruder connected to the support frame, and the heat sink 700 is connected to the extruder via bolts.

The Z-axis support is connected with the supporting seat, the X-axis section bar is connected with the Z-axis support, the printing platform is connected with the supporting seat in a sliding manner, and the Z-axis power structure is connected with the printing platform. The X-axis driving piece is used for driving the support frame to drive the printing head assembly 30 to move on the X-axis section bar, the X-axis section bar drives the printing head assembly 30 to move in the Y-axis direction under the action of the Y-axis power structure, and the Z-direction movement of the printing platform is matched to realize the relative movement of the printing head assembly 30 and the printing platform in the X-Y-Z directions, so that three-dimensional printing is realized.

The stereolithography apparatus includes a printhead assembly 30 according to any of the preceding claims, including advantages of any of the preceding printhead assemblies 30, and are not described in detail herein.

In one embodiment, as shown in fig. 10-13, the stereolithography apparatus further includes a mold heat sink assembly 920, wherein the mold heat sink assembly 920 is coupled to the support frame of the X-axis power structure. The model heat dissipation assembly 920 includes a model heat dissipation fan 921 and a flow guiding member 922, the flow guiding member 922 is provided with an air inlet, an air outlet and a flow guiding channel 9221, the flow guiding channel 9221 penetrates through the air inlet and the air outlet, the model heat dissipation fan 921 is opposite to the air inlet, and the air outlet is opposite to the lower side of the print head assembly 30 for cooling the model.

The rapid cooling of the model is conducive to accurate molding of the model, so that the printed model can play a supporting role of an upper model, and no deviation occurs. The air outlet of the flow guiding channel 9221 blows air towards the lower side of the printhead assembly 30, i.e. blows air while spraying, to achieve instant cooling and solidification. The air flow will also have an effect on the temperature of the nozzle 10 while cooling the mould. Since the thermal conductivity of the outer sleeve 200 is smaller than that of the inner sleeve 100, it is possible to reduce the heat dissipation on the outer sleeve 200 while ensuring effective heat conduction inside the nozzle 10. The arrows in fig. 13 indicate the air flow out of the air outlet.

The application also provides the following embodiments:

Embodiment 1, a nozzle for a stereolithography apparatus, the nozzle 10 comprising:

the inner sleeve 100, the inner sleeve 100 is provided with a first consumable channel 110, and the first consumable channel 110 penetrates through a first end and a second end of the inner sleeve 100;

The outer sleeve 200, the outer sleeve 200 is provided with a second consumable channel 210, the first end of the outer sleeve 200 is used for being opposite to the printing platform of the three-dimensional forming equipment, the second consumable channel 210 at least penetrates through the first end of the outer sleeve 200, the outer sleeve 200 is connected with the inner sleeve 100, and the first consumable channel 110 is communicated with the second consumable channel 210 to conduct consumables;

The hardness of the outer sleeve 200 is greater than that of the inner sleeve 100, and the thermal conductivity of the outer sleeve 200 is less than that of the inner sleeve 100.

Example 2, nozzle according to example 1, the material of the outer sleeve 200 comprises steel and the material of the inner sleeve 100 comprises copper.

Embodiment 3, the nozzle according to embodiment 1, the outer sleeve 200 is further provided with a nesting hole 220, one end of the nesting hole 220 is communicated with the second consumable channel 210, and the other end of the nesting hole 220 penetrates through the second end of the outer sleeve 200;

The outer sleeve 200 is sleeved on the outer periphery of the inner sleeve 100 through the sleeve hole 220 so that the first consumable channel 110 is communicated with the second consumable channel 210.

Embodiment 4, the nozzle according to embodiment 3, the nest hole 220 is transition fit with the inner member 100.

Embodiment 5, the nozzle according to embodiment 3, the radial cross-sectional area of the second consumable channel 210 is smaller than the radial cross-sectional area of the nesting hole 220, the engagement location of the second consumable channel 210 with the nesting hole 220 forming a first sealing land 230;

The first end of the inner sleeve 100 is opposite the first sealing land 230, and the second end of the inner sleeve 100 is located outside the nest bore 220; the second end of the inner sleeve 100 is adapted to receive an external force such that the first end of the inner sleeve 100 is sealed against the first sealing land 230.

In embodiment 6, according to the nozzle of embodiment 5, the second end of the inner sleeve 100 is provided with a force-bearing boss 120, the force-bearing boss 120 protrudes from the side wall of the inner sleeve 100, and a preset distance a is formed between the force-bearing boss 120 and the second end face of the outer sleeve 200;

The preset distance a is greater than or equal to 0.5 mm and less than or equal to 0.8 mm.

Embodiment 7, a printhead assembly 30, comprising a nozzle 10 according to any of embodiments 1-6 above, and a heating assembly 300, the heating assembly 300 having a third consumable channel 310, the third consumable channel 310 extending through a first end and a second end of the heating assembly 300, the nozzle 10 being connected to the heating assembly 300, and the first consumable channel 110 being in communication with the third consumable channel 310;

The heating assembly 300 is used for generating heat.

Embodiment 8, the printhead assembly 30 according to embodiment 7, the third consumable part channel 310 includes a connection section 311 and a melting section 312, one end of the connection section 311 is penetrated with the melting section 312, the other end of the connection section 311 is penetrated with the first end of the heating assembly 300, and the nozzle 10 is inserted into the connection section 311 and connected with the heating assembly 300; the inner wall of the connecting section 311 is provided with a first internal thread, and the outer wall of the outer sleeve 200 is provided with a first external thread;

The radial cross-sectional area of the connecting section 311 is larger than that of the melting section 312, the joint position of the connecting section 311 and the melting section 312 forms a second sealing table 313, the inner sleeve 100 is opposite to the second sealing table 313, the nozzle 10 is in threaded connection with the heating assembly 300 through the threaded fit of the first internal threads and the first external threads, and the inner sleeve 100 is in abutting sealing with the second sealing table 313; the radial cross-sectional area of the first consumable channel 110 is equal to the radial cross-sectional area of the melt section 312.

Embodiment 9, the printhead assembly 30 according to embodiment 7, the heating assembly 300 includes a heating block 320, a heating sheet 330 and a fixing member 340, the heating block 320 is provided with a third consumable channel 310, the nozzle 10 is connected with the heating block 320, the heating sheet 330 is connected with the heating block 320 through the fixing member 340, the heating sheet 330 is used for generating heat, and the heating block 320 is used for conducting heat.

In embodiment 10, the printhead assembly 30 according to embodiment 9, the fixing member 340 includes a connecting plate 341 and two spring arms 342, the two spring arms 342 are disposed opposite to each other at intervals and are connected to the connecting plate 341, and one ends of the two spring arms 342 away from the connecting plate 341 can spring mutually; the heating block 320 and the heating plate 330 are abutted, and the two elastic arms 342 are used for respectively clamping the heating block 320 and the heating plate 330 by the opposite sides of the heating block 320 and the heating plate 330 so as to relatively fix the heating block 320 and the heating plate 330;

Or the fixing piece 340 comprises a connecting plate 341 and two elastic arms 342, the two elastic arms 342 are oppositely arranged at intervals and are connected with the connecting plate 341, and one ends of the two elastic arms 342 far away from the connecting plate 341 can mutually spring; the heating plate 330 is abutted against the first side of the heating block 320, and the two spring arms 342 are used for clamping the heating block 320 by the second side of the heating block 320 and the third side of the heating block 320 respectively, so that the connecting plate 341 is abutted against the heating plate 330, the heating block 320 and the heating plate 330 are relatively fixed, and the second side of the heating block 320 and the third side of the heating block 320 are opposite sides different from the first side of the heating block 320;

the heating plate 330 has a plate-like structure, and the heating plate 330 is in surface contact with the heating block 320.

Embodiment 11, the printhead assembly 30 according to embodiment 7, the printhead assembly 30 further comprising:

The temperature measuring piece 400, the temperature measuring piece 400 is connected with the heating assembly 300 to detect the temperature of the heating assembly 300; the heating assembly 300 is provided with a temperature measuring hole 350, and the temperature measuring piece 400 is at least partially positioned in the temperature measuring hole 350.

Embodiment 12, the printhead assembly 30 according to embodiment 7, the printhead assembly 30 further comprising:

the throat 500, the throat 500 is provided with a fourth consumable channel 510, and the fourth consumable channel 510 penetrates through the first end and the second end of the throat 500; the throat 500 is inserted into the third consumable channel 310 from the first end;

The inner wall of the third consumable channel 310 is provided with a second internal thread, the outer wall of the throat 500 is provided with a second external thread, and the throat 500 is in threaded connection with the heating assembly 300 through the cooperation of the second internal thread and the second external thread.

Embodiment 13, the printhead assembly 30 according to embodiment 12, the printhead assembly 30 further comprising:

The transition tube 600 and the heat dissipation block 700, the transition tube 600 is provided with a fifth consumable channel 610, and the fifth consumable channel 610 penetrates through the first end and the second end of the transition tube 600;

The heat dissipation block 700 is provided with a mounting hole 710, and the mounting hole 710 penetrates through the first end and the second end of the heat dissipation block 700;

The throat 500 is inserted into the mounting hole 710 from the second end, the transition pipe 600 is inserted into the mounting hole 710 from the first end, the second end of the transition pipe 600 is positioned outside the mounting hole 710, and the fifth consumable channel 610 is communicated with the fourth consumable channel 510;

The print head assembly 30 further comprises a jackscrew 800, the heat dissipation block 700 is provided with a jackscrew hole 720, the jackscrew hole 720 penetrates through the mounting hole 710, and the jackscrew 800 penetrates through the jackscrew hole 720 and extrudes and fixes the throat 500;

The print head assembly 30 further includes a throat heat dissipation fan 910, the heat dissipation block 700 includes a heat dissipation block main body 730 and a plurality of heat dissipation fins 740, the mounting hole 710 is opened on the heat dissipation block main body 730, and the plurality of heat dissipation fins 740 are arranged in parallel and connected with the heat dissipation block main body 730;

the throat heat dissipation fan 910 is connected to the heat dissipation block main body 730 and is opposite to the heat dissipation fins 740.

Embodiment 14, the printhead assembly 30 according to embodiment 7, the printhead assembly 30 further comprising:

The shell 20, the shell 20 includes holding the inner chamber, the shell 20 offers top opening and giving way mouth communicated with holding the inner chamber, top opening and giving way mouth are set up relatively;

The outer casing 20 covers at least the outer periphery of the nozzle 10 and the heating assembly 300 through the top opening, and the first end of the outer sleeve 200 extends out of the accommodating cavity from the abdication opening.

Embodiment 15, a stereolithography apparatus comprising the printhead assembly 30 of any of embodiments 7-14 above.

Embodiment 16, the stereolithography apparatus according to embodiment 15, further comprising:

a device body and a model heat sink assembly 920, the printhead assembly 30 and the model heat sink assembly 920 being connected to the device body;

The model heat dissipation assembly 920 includes a model heat dissipation fan 921 and a flow guiding member 922, the flow guiding member 922 is provided with an air inlet, an air outlet and a flow guiding channel 9221, the flow guiding channel 9221 penetrates through the air inlet and the air outlet, the model heat dissipation fan 921 is opposite to the air inlet, and the air outlet is opposite to the lower side of the print head assembly 30 for cooling the model.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (16)

1. A nozzle for a stereolithography apparatus, the nozzle comprising:

The inner sleeve is provided with a first consumable channel, and the first consumable channel penetrates through the first end and the second end of the inner sleeve;

The outer sleeve is provided with a second consumable channel, the first end of the outer sleeve is used for being opposite to a printing platform of the three-dimensional forming equipment, the second consumable channel penetrates through at least the first end of the outer sleeve, the outer sleeve is connected with the inner sleeve, and the first consumable channel is communicated with the second consumable channel to conduct consumables;

The hardness of the outer sleeve is larger than that of the inner sleeve, and the heat conduction coefficient of the outer sleeve is smaller than that of the inner sleeve.

2. The nozzle of claim 1, wherein the nozzle is configured to,

The material of the outer sleeve comprises steel and the material of the inner sleeve comprises copper.

3. The nozzle of claim 1, wherein the nozzle is configured to,

The outer sleeve member is also provided with a nested hole, one end of the nested hole is communicated with the second consumable channel, and the other end of the nested hole penetrates through the second end of the outer sleeve member;

The outer sleeve member is sleeved on the periphery of the inner sleeve member through the nesting hole, so that the first consumable channel is communicated with the second consumable channel.

4. A nozzle as claimed in claim 3, wherein,

The nested holes are in transition fit with the inner sleeve member.

5. A nozzle as claimed in claim 3, wherein,

The radial cross-sectional area of the second consumable channel is smaller than that of the nesting hole, and a first sealing table top is formed at the joint position of the second consumable channel and the nesting hole;

The first end of the inner sleeve member is opposite to the first sealing table surface, and the second end of the inner sleeve member is positioned outside the nesting hole;

the second end of the inner sleeve member is used for bearing external force so that the first end of the inner sleeve member is in abutting sealing with the first sealing table surface.

6. The nozzle of claim 5, wherein the nozzle is configured to,

The second end of the inner sleeve member is provided with a stress boss, the stress boss protrudes out of the side wall of the inner sleeve member, and a preset distance a is reserved between the stress boss and the end face of the second end of the outer sleeve member;

The preset distance a is more than or equal to 0.5 mm and less than or equal to 0.8 mm.

7. A printhead assembly comprising a nozzle as claimed in any one of claims 1 to 6, and

The heating assembly is provided with a third consumable channel, the third consumable channel penetrates through the first end and the second end of the heating assembly, the nozzle is connected with the heating assembly, and the first consumable channel is communicated with the third consumable channel;

The heating component is used for generating heat.

8. The printhead assembly of claim 7, wherein,

The third consumable channel comprises a connecting section and a melting section, one end of the connecting section is communicated with the melting section, the other end of the connecting section is communicated with the first end of the heating assembly, and the nozzle is inserted into the connecting section and connected with the heating assembly;

the inner wall of the connecting section is provided with a first internal thread, and the outer wall of the outer sleeve piece is provided with a first external thread;

The radial cross-sectional area of the connecting section is larger than that of the melting section, a second sealing table top is formed at the joint position of the connecting section and the melting section, the inner sleeve piece is opposite to the second sealing table top, the nozzle is in threaded connection with the heating assembly through the threaded fit of the first internal threads and the first external threads, and the inner sleeve piece is in abutting sealing with the second sealing table top;

The radial cross-sectional area of the first consumable channel is equal to the radial cross-sectional area of the melting section.

9. The printhead assembly of claim 7, wherein,

The heating assembly comprises a heating block, a heating sheet and a fixing piece, wherein the heating block is provided with a third consumable channel, the nozzle is connected with the heating block, the heating sheet is connected with the heating block through the fixing piece, the heating sheet is used for heating, and the heating block is used for conducting heat.

10. The printhead assembly of claim 9, wherein the printhead assembly is configured to,

The fixing piece comprises a connecting plate and two spring arms, wherein the two spring arms are oppositely arranged at intervals and are connected with the connecting plate, and one ends of the two spring arms, which are far away from the connecting plate, can mutually spring; the heating block is abutted with the heating plate, and the two elastic arms are used for clamping the heating block and the heating plate respectively by one sides of the heating block and the heating plate, which are opposite to each other, so that the heating block and the heating plate are relatively fixed;

Or the fixing piece comprises a connecting plate and two spring arms, wherein the two spring arms are oppositely arranged at intervals and are connected with the connecting plate, and one ends of the two spring arms, which are far away from the connecting plate, can mutually spring; the heating plate is abutted with the first side of the heating block, and the two spring arms are used for clamping the heating block by the second side of the heating block and the third side of the heating block respectively, so that the connecting plate is abutted with the heating plate, the heating block and the heating plate are relatively fixed, and the second side of the heating block and the third side of the heating block are opposite sides different from the first side of the heating block;

The heating plate is of a plate-shaped structure, and the heating plate is abutted to the surface of the heating block.

11. The printhead assembly of claim 7, wherein the printhead assembly further comprises:

The temperature measuring piece is connected with the heating component to detect the temperature of the heating component;

The heating component is provided with a temperature measuring hole, and the temperature measuring piece is at least partially positioned in the temperature measuring hole.

12. The printhead assembly of claim 7, wherein the printhead assembly further comprises:

the throat is provided with a fourth consumable channel, and the fourth consumable channel penetrates through the first end and the second end of the throat;

The throat is inserted into the third consumable channel from the first end;

The inner wall of the third consumable channel is provided with second internal threads, the outer wall of the throat is provided with second external threads, and the throat is in threaded connection with the heating assembly through the cooperation of the second internal threads and the second external threads.

13. The printhead assembly of claim 12, wherein the printhead assembly further comprises:

The transition pipe is provided with a fifth consumable channel, and the fifth consumable channel penetrates through the first end and the second end of the transition pipe;

The radiating block is provided with a mounting hole, and the mounting hole penetrates through the first end and the second end of the radiating block;

The throat pipe is inserted into the mounting hole from the second end, the transition pipe is inserted into the mounting hole from the first end, the second end of the transition pipe is positioned outside the mounting hole, and the fifth consumable channel is communicated with the fourth consumable channel;

the printing head assembly further comprises a jackscrew, the heat dissipation block is provided with a jackscrew hole, the jackscrew hole penetrates through the mounting hole, and the jackscrew is connected to the jackscrew hole in a penetrating manner and extrudes and fixes the throat pipe;

The printing head assembly further comprises a throat cooling fan, the cooling block comprises a cooling block main body and a plurality of cooling fins, the mounting hole is formed in the cooling block main body, and the cooling fins are arranged in parallel and connected with the cooling block main body;

The throat cooling fan is connected with the cooling block main body and is opposite to the cooling fin.

14. The printhead assembly of claim 7, wherein the printhead assembly further comprises:

The shell comprises an accommodating cavity, a top opening and a yielding port which are communicated with the accommodating cavity are formed in the shell, and the top opening and the yielding port are oppositely arranged;

The shell is at least covered on the periphery of the nozzle and the heating component through the top end opening, and the first end of the outer sleeve piece extends out of the accommodating inner cavity from the yielding port.

15. A stereolithography apparatus comprising a printhead assembly as claimed in any one of claims 7 to 14.

16. The stereolithography apparatus according to claim 15, further comprising:

the printing head assembly and the model heat dissipation assembly are connected with the equipment main body;

The model cooling assembly comprises a model cooling fan and a flow guide piece, wherein an air inlet, an air outlet and a flow guide channel are formed in the flow guide piece, the flow guide channel penetrates through the air inlet and the air outlet, the model cooling fan is opposite to the air inlet, and the air outlet is opposite to the lower side of the printing head assembly and used for cooling the model.