Laser coaxial deposition printing head device with atmosphere protection and deposition printing equipment

Abstract

The utility model relates to a laser coaxial deposition printing head device with atmosphere protection and deposition printing equipment. The laser coaxial deposition printing head device with the atmosphere protection function comprises a printing head shell, a printing head guide nozzle, a feeding pipe, a light beam shaping unit, a gas storage device and a gas feeding pipeline. And the inert gas in the gas storage device is ejected to the molten pool area on the workbench through the gas supply pipeline, the first gas outlet of the printing head guide nozzle, the bottom end opening of the feeding pipe and the small end opening of the output head protection guide nozzle, so that a local protection atmosphere field is formed. Inert gas emitted by the output head protection guide nozzle and a local protection atmosphere field can change the splashing direction of molten pool metal evaporant and splash generated by the printing laser beam, and the service life of the laser coaxial deposition printing head device with atmosphere protection is prolonged. The local protective atmosphere field can isolate oxygen in air, turbulence and fluctuation on the surface of the molten pool are reduced, heat exchange between the molten pool and the surrounding environment is reduced, and the quality and performance of formed parts are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser deposition printing equipment, in particular to a laser coaxial deposition printing head device with atmosphere protection and a deposition printing equipment. Background Art

[0002] In terms of metal 3D printing technology, the laser powder feeding and fused wire additive manufacturing technology of directed energy deposition forming has been widely promoted and applied in various industrial fields due to its strong material adaptability and basically unlimited printing size range. As the key to laser directed energy deposition forming, the laser coaxial fuse print head plays a vital role in the entire process system. The core advantage of the laser coaxial fuse print head is that it can realize the coaxial transmission of metal wire and laser beam, ensuring that the metal wire can be accurately in the action area of ​​the laser at any angle and position, and can realize the flexible adjustment of the material accumulation amount and accumulation method of different parts of the parts, so as to meet the diverse design needs.

[0003] The technical research of laser coaxial fuse print head mainly focuses on: multi-beam splitting, precise focusing of optical path, optical wire alignment design, wire straightening mechanism design and other technical research, and no effective design and research on the atmosphere protection system of laser coaxial fuse print head has been carried out. The existing atmosphere protection system of laser coaxial fuse print head is difficult to meet the requirements of long-term reliable and stable use of laser coaxial fuse print head, which affects the reliability of laser coaxial deposition printing equipment and the molding quality of printed parts. Utility Model Content

[0004] Based on this, it is necessary to provide a laser coaxial deposition print head device and deposition printing equipment with atmosphere protection that can be used reliably and stably for a long time.

[0005] A laser coaxial deposition print head device with atmosphere protection, comprising:

[0006] Print head housing;

[0007] A print head guide nozzle is installed at the bottom of the print head housing; a side wall of the print head guide nozzle has a first air inlet; an end of the print head guide nozzle away from the print head housing has a light spot outlet connected to the print head housing and a first air outlet connected to the first air inlet;

[0008] A feed pipe is vertically arranged in the print head housing; the top of the feed pipe is used to communicate with a feeding device in the laser coaxial deposition printing device; the bottom opening of the feed pipe is located directly above the light spot outlet; a second air inlet is opened on the side wall of the feed pipe;

[0009] A beam shaping unit is obliquely arranged in the print head housing; one end of the beam shaping unit is used to communicate with the laser generator, and the other end is arranged toward the light spot outlet;

[0010] A funnel-shaped output head protection nozzle, the large end of which is mounted on one end of the beam shaping unit facing the light spot outlet and is coaxially arranged with the beam shaping unit; a third air inlet is formed on the side wall of the output head protection nozzle; the small end opening of the output head protection nozzle and the bottom end opening of the feeding tube are respectively projected on the workbench surface in the laser coaxial deposition printing device along their respective opening directions, and at least partially overlap;

[0011] A gas storage device for storing inert gas;

[0012] An air supply pipeline, one end of which is connected to the gas storage device, and the other end of which is respectively connected to the first air inlet, the second air inlet and the third air inlet.

[0013] In one of the embodiments, the beam shaping unit and the output head protection guide nozzle are multiple and connected one by one; the multiple beam shaping units and the multiple output head protection guide nozzles are all arranged around the feeding tube and spaced apart along the circumference of the feeding tube.

[0014] In one of the embodiments, the end of the print head guide nozzle facing away from the print head housing has multiple groups of the first air outlets; the multiple groups of the first air outlets are arranged at intervals along the circumference of the light spot outlet; and each group includes at least one first air outlet.

[0015] In one of the embodiments, the first air outlet is located inside the light spot outlet and is located at or close to an inner edge of the light spot outlet.

[0016] In one of the embodiments, an isolation lens is further included; the isolation lens is detachably installed in the print head guide nozzle and is located on the optical path of the printing laser beam emitted by the output head protection guide nozzle to cover the small end opening of the output head protection guide nozzle.

[0017] In one of the embodiments, a mounting plate is provided on the inner wall of the print head guide nozzle near one end of the beam shaping unit; a mounting hole is formed on the mounting plate; and the isolation lens is detachably mounted on the mounting hole.

[0018] In one of the embodiments, it also includes a threaded fixing ring; the outer wall of one end of the threaded fixing ring has an external thread; the mounting hole is a stepped hole, and the inner wall of the large hole of the stepped hole has an internal thread; the end of the threaded fixing ring with the external thread is screwed into the large hole of the stepped hole to clamp the isolation lens between the threaded fixing ring and the axial end face in the stepped hole.

[0019] In one embodiment, the isolation lens is a transparent plane mirror.

[0020] In one embodiment, a feeding nozzle is further included; one end of the feeding nozzle is installed at one end of the feeding pipe facing the light spot outlet, and the other end extends out of the light spot outlet.

[0021] A laser coaxial deposition printing device includes the laser coaxial deposition printing head device with atmosphere protection, a workbench, a feeding device, and a laser generator as described above; the printing head nozzle is arranged directly above the workbench; the feeding device is communicated with the top end of the feeding pipe; the laser generator is communicated with one end of the beam shaping unit away from the output head protection nozzle.

[0022] For the above-mentioned laser coaxial deposition printing head device with atmosphere protection and the deposition printing device, when the laser coaxial deposition printing device is working, the inert gas in the gas storage is continuously transported into the printing head nozzle, the feeding pipe, and the output head protection nozzle respectively through the air supply pipeline, and the inert gas in the printing head nozzle, the feeding pipe, and the output head protection nozzle is ejected to the molten pool area on the workbench through the first air outlet, the bottom opening of the feeding pipe, and the small end opening of the output head protection nozzle respectively to form a local protection atmosphere field.

[0023] First of all, the inert gas ejected from the output head protection nozzle and the local protection atmosphere field can effectively change the splashing direction of the molten pool metal evaporation and splashing generated by the printing laser beam, reduce the pollution of the beam shaping unit and the lens in the output head protection nozzle by the metal evaporation and splashing, and effectively extend the service life of the laser coaxial deposition printing head device with atmosphere protection.

[0024] In addition, the local protection atmosphere field can effectively isolate the oxygen in the air, prevent the metal in the molten pool and the nearby high-temperature area from oxidizing at high temperature, thereby maintaining the purity and stability of the molten pool, effectively reducing the generation of metallurgical defects such as pores and inclusions, and improving the quality and performance of the formed parts.

[0025] Furthermore, an inert gas protection layer is formed around the molten pool, which can reduce the turbulence and fluctuation on the surface of the molten pool, is beneficial to the stable and uniform solidification of the molten pool, can reduce the printing defects caused by the instability of the molten pool, and further improve the quality and performance of the formed parts.

[0026] Even further, during the laser cladding process, the formed local protection atmosphere field can reduce the heat exchange between the molten pool and the surrounding environment, reduce the temperature gradient, thereby reducing the generation of thermal stress, avoiding problems such as deformation and cracking of the formed parts due to excessive thermal stress, and further improving the quality and performance of the formed parts. Description of the Drawings

[0027] Figure 1 Schematic diagram of the structure of a laser coaxial deposition print head device with atmosphere protection in a preferred embodiment of the present utility model;

[0028] Figure 2 is Figure 1 Exploded view of the installation state among the print head nozzle, isolation lens, and feed nozzle in the shown laser coaxial deposition print head device with atmosphere protection;

[0029] Figure 3 is Figure 1 Cross-sectional view of the print head nozzle in the shown laser coaxial deposition print head device with atmosphere protection;

[0030] Figure 4 is Figure 1 Schematic diagram of the structure of the output head protection nozzle in the shown laser coaxial deposition print head device with atmosphere protection.

[0031] Explanation of the reference numerals in the drawings in the specific implementation manner: 100, laser coaxial deposition print head device with atmosphere protection; 110, print head housing; 120, print head nozzle; 121, first air inlet; 122, light spot outlet; 123, first air outlet; 130, feed pipe; 131, second air inlet; 140, beam shaping unit; 150, output head protection nozzle; 151, third air inlet; 160, gas storage; 170, air supply pipeline; 180, isolation lens; 190, mounting plate; 191, mounting hole; 201, threaded fixing ring; 202, feed nozzle; 200, workbench; 300, loading device. Specific implementation manner

[0032] For the convenience of understanding the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present utility model are given in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure content of the present utility model more thorough and comprehensive.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0034] When describing positional relationships, unless otherwise specified, when an element is referred to as being "on" another element, it can be directly on the other element or there can also be intermediate elements. It can also be understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements, or there can also be one or more intermediate elements.

[0035] In the case of using "comprising", "having", and "including" as described herein, unless explicit limiting terms are used, such as "only", "consisting of", etc., another component can also be added. Unless otherwise mentioned, terms in the singular form can include the plural form and should not be understood as having a quantity of one.

[0036] Please refer to Figure 1 , the present utility model provides a laser coaxial deposition print head device 100 with atmosphere protection and a deposition printing device. Among them, the laser coaxial deposition printing device includes a laser coaxial deposition print head device 100 with atmosphere protection, a workbench 200, a feeding device 300, and a laser generator (not shown in the figure). The laser coaxial deposition print head device 100 with atmosphere protection is located directly above the workbench 200. The feeding device 300 is used to convey metal materials such as metal powder or metal wire to the workbench 200 through the laser coaxial deposition print head device. The laser generator is used to generate high-energy laser and transmit the high-energy laser to the laser coaxial deposition print head device 100 with atmosphere protection to form a printing laser beam within the laser coaxial deposition print head device 100 with atmosphere protection, and under the action of the laser coaxial deposition print head device 100 with atmosphere protection, irradiate the printing laser beam onto the metal material on the workbench 200 to perform deposition printing work.

[0037] Please refer to Figure 1 , the laser coaxial deposition print head device 100 with atmosphere protection in the preferred embodiment of the present utility model includes a print head housing 110, a print head nozzle 120, a feeding tube 130, a beam shaping unit 140, an output head protection nozzle 150, a gas storage 160, and a gas supply pipeline 170.

[0038] Please refer to together Figure 2 and Figure 3 , the print head nozzle 120 is installed at the bottom of the print head housing 110. The side wall of the print head nozzle 120 has a first air inlet 121. One end of the print head nozzle 120 facing away from the print head housing 110 has a light spot outlet 122 communicating with the print head housing 110 and a first air outlet 123 communicating with the first air inlet 121.

[0039] The feeding pipe 130 is vertically arranged inside the print head housing 110. The top of the feeding pipe 130 is used to communicate with the feeding device 300 in the laser coaxial deposition printing equipment. The bottom opening of the feeding pipe 130 is located directly above the light spot outlet 122. A second air inlet 131 is formed on the side wall of the feeding pipe 130.

[0040] The beam shaping unit 140 is inclined and arranged inside the print head housing 110. One end of the beam shaping unit 140 is used to communicate with the laser generator, and the other end is arranged towards the light spot outlet 122.

[0041] Please refer to Figure 4 simultaneously. The output head protection nozzle 150 is funnel-shaped. The large end of the output head protection nozzle 150 is installed at one end of the beam shaping unit 140 facing the light spot outlet 122 and is coaxially arranged with the beam shaping unit 140. A third air inlet 151 is formed on the side wall of the output head protection nozzle 150. The small end opening of the output head protection nozzle 150 and the bottom opening of the feeding pipe 130 at least partially overlap in the projection on the table surface of the workbench 200 in the laser coaxial deposition printing equipment along their respective opening directions.

[0042] The gas storage 160 is used to store inert gas. One end of the gas supply pipeline 170 is communicated with the gas storage 160, and the other end is respectively communicated with the first air inlet 121, the second air inlet 131 and the third air inlet 151.

[0043] In the laser coaxial deposition printing equipment, the direction in which the print head housing 110 points to the print head nozzle 120 is vertically downward. The workbench 200 is located directly below the print head nozzle 120. The feeding device 300 is communicated with the top end of the feeding pipe 130, and the laser generator is communicated with the end of the beam shaping unit 140 far from the output head protection nozzle 150.

[0044] When the laser coaxial deposition printing equipment is working, the inert gas in the gas storage 160 can be continuously transported through the gas supply pipeline 170 into the print head nozzle 120, the feeding pipe 130 and the output head protection nozzle 150 respectively. The inert gas in the print head nozzle 120, the feeding pipe 130 and the output head protection nozzle 150 is respectively ejected from the first air outlet 123, the bottom opening of the feeding pipe 130 and the small end opening of the output head protection nozzle 150 to the molten pool area on the workbench 200 from different directions to form a local protection atmosphere field that can comprehensively cover the molten pool.

[0045] First, the inert gas ejected from the output head protection nozzle 150 and the local protection atmosphere field can effectively change the splashing direction of the molten pool metal evaporation and spatter generated by the printing laser beam, reduce the contamination of the beam shaping unit 140 and the lens in the output head protection nozzle 150 by the metal evaporation and spatter, and effectively extend the service life of the laser coaxial deposition printing head device 100 with atmosphere protection.

[0046] In addition, the local protection atmosphere field can effectively isolate the oxygen in the air, prevent the metal in the molten pool and the nearby high-temperature area from oxidizing at high temperature, thereby maintaining the purity and stability of the molten pool, effectively reducing the generation of metallurgical defects such as pores and inclusions, and improving the quality and performance of the formed parts.

[0047] Furthermore, forming an inert gas protection layer around the molten pool can reduce the turbulence and fluctuation on the surface of the molten pool, is conducive to the stable and uniform solidification of the molten pool, can reduce the printing defects caused by the instability of the molten pool, and further improve the quality and performance of the formed parts.

[0048] Even further, during the laser cladding process, the formed local protection atmosphere field can reduce the heat exchange between the molten pool and the surrounding environment, reduce the temperature gradient, thereby reducing the generation of thermal stress, avoiding problems such as deformation and cracking of the formed parts due to excessive thermal stress, and even further improving the quality and performance of the formed parts.

[0049] Please refer to again Figure 1 , in some embodiments, there are multiple beam shaping units 140 and output head protection nozzles 150 that are respectively and correspondingly connected one by one. The multiple beam shaping units 140 and the multiple output head protection nozzles 150 are all arranged around the feed pipe 130 and at intervals along the circumferential direction of the feed pipe 130. In this way, multiple printing laser beams can be formed around the feed pipe 130, which not only ensures the uniform distribution of the printing laser beams but also realizes the coaxial coupling of the printing laser beams and the metal material, improving the utilization rate of laser energy.

[0050] Please refer to again Figure 3 , in some embodiments, one end of the printing head nozzle 120 facing away from the printing head housing 110 has multiple groups of first air outlets 123. The multiple groups of first air outlets 123 are arranged at intervals along the circumferential direction of the light spot outlet 122. Each group includes at least one first air outlet 123. Each first air outlet 123 is communicated with the first air inlet 121. Among them, there can be only one first air outlet 123 in each group of first air outlets 123, or multiple first air outlets 123 can be included. When each group includes multiple first air outlets 123, the multiple first air outlets 123 are respectively arranged at intervals along the circumferential direction and the diameter direction of the light spot outlet 122.

[0051] Thus, the multi-group of first gas outlets 123 arranged at circumferential intervals along the light spot outlet 122 enable the inert gas in the print head nozzle 120 to flow out from the multi-group of first gas outlets 123 respectively, so as to protect the molten pool from oxidation from multiple angles.

[0052] Further, in some embodiments, the first gas outlet 123 is located within the light spot outlet 122 and is located at or near the inner edge of the light spot outlet 122. Specifically, the distribution of the multiple first gas outlets 123 on the print head nozzle 120 includes the following three cases: First, all the first gas outlets 123 are located at the inner edge of the light spot outlet 122; Second, all the first gas outlets 123 are located at positions near the inner edge of the light spot outlet 122; Third, in each group of first gas outlets 123, some first gas outlets 123 are located at the inner edge of the light spot outlet 122, and the remaining first gas outlets 123 are located at positions near the inner edge of the light spot outlet 122.

[0053] Thus, arranging the first gas outlet 123 within the light spot outlet 122 is beneficial to reducing the volume of the print head nozzle 120. The first gas outlet 123 is arranged at or near the inner edge of the light spot outlet 122 to avoid the inert gas ejected from the first gas outlet 123 affecting the beam trajectory of the printing laser beam ejected from the light spot outlet 122.

[0054] Please refer to again Figure 2 , in some embodiments, the laser coaxial deposition print head device 100 with atmosphere protection further includes an isolation lens 180. The isolation lens 180 is detachably installed within the print head nozzle 120 and is located on the optical path of the printing laser beam ejected from the output head protection nozzle 150 to block the small end opening of the output head protection nozzle 150.

[0055] Thus, the setting of the isolation lens 180 can physically isolate the molten pool spatter that cannot be filtered by the local protection atmosphere field and the inert gas ejected from the small end of the output head protection nozzle 150, so as to further reduce the probability of the molten pool spatter contaminating the beam shaping unit 140 and the lens within the output head protection nozzle 150. And when the isolation lens 180 is contaminated or damaged by spatter, it can be directly removed and replaced or maintained, which is beneficial to further extending the service life of the laser coaxial deposition print head device 100 with atmosphere protection.

[0056] Specifically, the isolation lens 180 is a transparent plane mirror. Since the isolation lens 180 is located on the optical path of the printing laser beam emitted by the output head protection nozzle 150, the printing laser beam will pass through the isolation lens 180 and reach the spot outlet 122. The isolation lens 180 is set as a transparent plane mirror to ensure that the printing laser beam emitted by the beam shaping unit 140 will basically not change after passing through the isolation lens 180, reducing the influence of the isolation lens 180 on the spot, path, beam energy, etc. of the printing laser beam.

[0057] Of course, in other embodiments, the isolation lens 180 can also be a low refractive index glass, an anamorphic lens, etc.

[0058] Further, in some embodiments, an installation plate 190 is provided on the inner wall of one end of the print head nozzle 120 close to the beam shaping unit 140. An installation hole 191 is formed on the installation plate 190. The isolation lens 180 is detachably installed in the installation hole 191. Specifically, the central axis direction of the installation hole 191 is the same as the central axis direction of the output head protection nozzle 150. More specifically, the central axis of the installation hole 191 is coaxially arranged with the central axis of the output head protection nozzle 150.

[0059] Among them, the installation plate 190 can be fixed in the print head nozzle 120 by welding or other means, or can be integrally formed with the print head nozzle 120 by 3D printing or other means. The setting of the installation plate 190 facilitates the more rapid installation of the isolation lens 180 in place.

[0060] Even further, in some embodiments, the laser coaxial deposition print head device 100 with atmosphere protection further includes a threaded fixing ring 201. The outer wall of one end of the threaded fixing ring 201 has an external thread. The installation hole 191 is a stepped hole, and the inner wall of the large hole of the stepped hole has an internal thread. The end of the threaded fixing ring 201 with the external thread is screwed into the large hole of the stepped hole to clamp the isolation lens 180 between the threaded fixing ring 201 and the axial end face in the stepped hole.

[0061] When it is necessary to install the isolation lens 180 onto the installation plate 190, only need to place the isolation lens 180 into the large hole of the stepped hole, and then screw the threaded fixing ring 201 into the large hole to press the isolation lens 180; when it is necessary to remove the isolation lens 180, only need to unscrew the threaded fixing ring 201 from the large hole of the stepped hole, and then take out the isolation lens 180. Therefore, setting the installation hole 191 as a stepped hole and cooperating with the threaded fixing ring 201 further improves the convenience of disassembly and assembly of the isolation lens 180.

[0062] Of course, in other embodiments, the isolation lens 180 can also be installed at the mounting hole 191 in other ways. For example, the isolation lens 180 can be directly fixed at the mounting hole 191 through a threaded connector, or the isolation lens 180 can be pressed against the mounting hole 191 with the help of other pressing structures.

[0063] In some embodiments, the laser coaxial deposition print head device 100 with atmosphere protection further includes a feeding nozzle 202. One end of the feeding nozzle 202 is installed at one end of the feeding pipe 130 facing the light spot outlet 122 and is communicated with the feeding pipe 130, and the other end extends out of the light spot outlet 122. Since one end of the feeding nozzle 202 extends out of the light spot outlet 122, that is, it is located below the print head nozzle 120 and is closer to the surface of the molten pool, the setting of the feeding nozzle 202 can more accurately deliver the metal material in the feeding pipe 130 to the workbench 200, which helps to improve the feeding accuracy.

[0064] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0065] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A laser coaxial deposition printing head device with atmosphere protection, characterized in that, Comprising: A print head housing; A print head nozzle, installed at the bottom of the print head housing; the side wall of the print head nozzle has a first air inlet; One end of the print head nozzle facing away from the print head housing has a light spot outlet communicating with the print head housing and a first air outlet communicating with the first air inlet; A feed pipe, vertically arranged in the print head housing; the top of the feed pipe is used to communicate with a feeding device in a laser coaxial deposition printing device; the bottom opening of the feed pipe is located directly above the light spot outlet; A second air inlet is provided on the side wall of the feed pipe; A beam shaping unit, obliquely arranged in the print head housing; one end of the beam shaping unit is used to communicate with a laser generator, and the other end is arranged towards the light spot outlet; An output head protection nozzle in a funnel shape, with its large end installed at one end of the beam shaping unit facing the light spot outlet and coaxially arranged with the beam shaping unit; a third air inlet is formed on the side wall of the output head protection nozzle; the small end opening of the output head protection nozzle and the bottom opening of the feed pipe are respectively projected along their respective opening directions, and at least partially overlap on the workbench surface in the laser coaxial deposition printing device; A gas storage, used to store inert gas; An air supply pipeline, with one end communicating with the gas storage and the other end respectively communicating with the first air inlet, the second air inlet and the third air inlet.

2. The laser coaxial deposition printing head device with atmosphere protection according to claim 1, characterized in that, The beam shaping unit and the output head protection nozzle are multiple and are respectively connected in one-to-one correspondence; the multiple beam shaping units and the multiple output head protection nozzles all surround the feed pipe and are arranged at intervals along the circumferential direction of the feed pipe.

3. The laser coaxial deposition printing head device with atmosphere protection according to claim 1, wherein One end of the print head nozzle facing away from the print head housing has multiple groups of the first air outlets; the multiple groups of the first air outlets are arranged at intervals along the circumferential direction of the light spot outlet; each group includes at least one of the first air outlets.

4. The laser coaxial deposition printing head device with atmosphere protection according to claim 3, wherein, The first air outlet is located inside the light spot outlet and is located at or near the inner edge of the light spot outlet.

5. The laser coaxial deposition printing head device with atmosphere protection according to claim 1, wherein It further includes an isolation lens; the isolation lens is detachably installed in the print head nozzle and is located on the optical path of the printing laser beam emitted from the output head protection nozzle to block the small end opening of the output head protection nozzle.

6. The laser coaxial deposition printing head device with atmosphere protection according to claim 5, characterized in that, An installation plate is provided on the inner wall of the print head nozzle near the beam shaping unit; an installation hole is formed on the installation plate; the isolation lens is detachably installed in the installation hole.

7. The laser coaxial deposition printing head device with atmosphere protection according to claim 6, characterized in that, It further includes a threaded fixing ring; the outer wall of one end of the threaded fixing ring has an external thread; the installation hole is a stepped hole, and the inner wall of the large hole of the stepped hole has an internal thread; the end of the threaded fixing ring with the external thread is screwed into the large hole of the stepped hole to clamp the isolation lens between the threaded fixing ring and the axial end face in the stepped hole.

8. The laser coaxial deposition printing head device with atmosphere protection according to claim 5, characterized in that, The isolation lens is a transparent flat mirror.

9. The laser coaxial deposition printing head device with atmosphere protection according to claim 1, characterized in that, It further includes a feed nozzle; one end of the feed nozzle is installed at one end of the feed pipe facing the light spot outlet, and the other end extends out of the light spot outlet.

10. A laser coaxial deposition printing device, characterized in that, It includes a laser coaxial deposition printing head device with atmosphere protection, a workbench, a feeding device and a laser generator as described in any one of claims 1 to 9; the printing head nozzle is arranged directly above the workbench; the feeding device is communicated with the top end of the feeding pipe; the laser generator is communicated with one end of the beam shaping unit away from the output head protection nozzle.

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