Blow head and laser welding apparatus
By employing an inclined first and second air blowing channel design in the laser welding equipment, protective gas is introduced in synergy to remove fumes and prevent weld oxidation, thus solving the problem of fume pollution under high power and deep welding, and improving welding quality and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- UNITED WINNERS LASER CO LTD
- Filing Date
- 2025-05-23
- Publication Date
- 2026-06-12
AI Technical Summary
In high-power and deep-welding laser welding processes, conventional transverse air blowing methods cannot effectively disperse fumes, causing fumes to contaminate the protective glass and affect the welding depth and quality.
An air blowing head design is adopted, including first and second air blowing channels. The first air blowing channel is inclined towards the light-incident end, and the second air blowing channel is inclined towards the light-outcident end. They work together to introduce protective gas, remove smoke and dust on the protective glass and form an airflow layer to prevent smoke and dust from entering the laser channel. The second air blowing channel replenishes gas and forms a low-pressure environment to disperse the air in the solder joint area and prevent the solder joint from oxidizing.
It effectively prevents contamination of the protective glass, ensures welding depth and quality, prevents oxidation of the weld joint, and improves welding stability and quality.
Smart Images
Figure CN224347128U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of laser welding technology, and in particular to an air blowing head and laser welding equipment. Background Technology
[0002] During laser processing, fumes are generated at the weld joints of the workpieces being welded. To prevent these fumes from affecting the focusing lens, a protective glass is typically placed downstream of the focusing lens in the direction of laser beam transmission. This glass blocks the fumes that escape in the opposite direction of laser transmission, effectively protecting the focusing lens and ensuring effective laser beam focusing. Similarly, the protective glass also needs to be kept clean to ensure smooth laser beam penetration. In existing technologies, this is often achieved by placing an air blowing head at the light-emitting end of the laser welding head. The air blowing head is hollow and has a laser channel coaxial with the laser beam. An external protective gas source is connected to the air blowing head, and by introducing protective gas into the laser channel, a transverse airflow is formed. This airflow disperses the fumes that escape in the opposite direction of laser transmission (entering the laser channel from the welding area), preventing these fumes from contaminating the protective glass and ensuring its light transmittance. Furthermore, the protective gas disperses air in the outlet area of the air blowing head, i.e., the laser welding area, preventing weld joint oxidation.
[0003] However, when faced with high-power (laser power greater than 4KW) and large welding depth (5mm) processing scenarios, the dust scatters violently and in large quantities. Conventional transverse air blowing methods cannot effectively disperse the dust in the laser channel. At the same time, this dust will also absorb laser energy, thus affecting the welding depth and quality. Utility Model Content
[0004] In view of the shortcomings of the existing technology, the first objective of this utility model is to provide an air blowing head that can effectively prevent smoke and dust from polluting and protecting the glass, and ensure the welding depth and quality.
[0005] The second objective of this invention is to provide a laser welding device that can maintain cleanliness while providing a protective gas to the weld joint, ensuring that the weld joint is not oxidized and guaranteeing welding quality.
[0006] The embodiments of this utility model are achieved through the following technical solutions:
[0007] An air blowing head includes a body with a laser channel extending through it. The laser channel is coaxial with a laser beam and has an incident end and an exit end. The laser beam is transmitted from the incident end to the exit end. A protective glass is located on one side of the incident end. A first air blowing channel and a second air blowing channel for delivering protective gas into the laser channel are provided through the side wall of the body. The first air blowing channel is located between the second air blowing channel and the incident end. The first air blowing channel is inclined towards the direction closer to the incident end, and the second air blowing channel is inclined towards the direction closer to the exit end.
[0008] After protective gas is introduced into the laser channel through the first and second air blowing channels, the protective gas entering through the first air blowing channel impacts the protective glass, effectively removing the dust adhering to it; simultaneously, it effectively cools the protective glass; and this protective gas forms an airflow layer near the side of the protective glass facing the light-emitting end, effectively isolating suspended dust and preventing it from adhering to the protective glass. As the protective gas exits the laser channel, the dust within the laser channel moves towards the light-emitting end with the protective gas and is expelled. The protective gas, on the one hand, prevents dust from entering the laser channel through the light-emitting end, and on the other hand, effectively disperses air in the weld area of the workpiece, preventing weld oxidation. The protective gas introduced into the laser channel through the second air blowing channel replenishes the protective gas introduced through the first air blowing channel, ensuring that the weld area of the workpiece is not oxidized; on the other hand, it accelerates the protective gas (introduced into the laser channel through the first air blowing channel) and creates a low-pressure environment, further facilitating the exit of dust from the laser channel along with the protective gas. By combining the first and second air blowing channels, the protective glass can be effectively prevented from being contaminated, and the smoke and dust can be effectively prevented from affecting the welding depth and quality.
[0009] According to a preferred embodiment, there are multiple first air blowing channels, and the multiple first air blowing channels are evenly distributed at circumferential intervals along the laser channel.
[0010] According to a preferred embodiment, there are multiple second air blowing channels, and the multiple second air blowing channels are evenly distributed at circumferential intervals along the laser channel.
[0011] According to a preferred embodiment, there are multiple first air blowing channels, and a first airflow stream is formed by the protective gas entering the laser channel through the first air blowing channel. The multiple first airflow streams corresponding to the multiple first air blowing channels converge at a first convergence point in the laser channel.
[0012] According to a preferred embodiment, the first convergence point is located on the center line of the optical axis of the laser beam.
[0013] According to a preferred embodiment, the first convergence point is located on the side of the protective glass near the light-emitting end.
[0014] According to a preferred embodiment, there are multiple second air blowing channels. A second airflow stream is formed by the protective gas entering the laser channel through the second air blowing channel. The multiple second airflow streams corresponding to the multiple second air blowing channels converge at a second convergence point in the laser channel. After the first airflow stream collides and splits at the first convergence point, it merges with the second airflow stream at the second convergence point to form a combined airflow, and is discharged from the laser channel through the light-emitting end.
[0015] According to a preferred embodiment, the second convergence point is located on the center line of the optical axis of the laser beam.
[0016] According to a preferred embodiment, the region of the laser channel near the light-emitting end is cone-shaped, forming a converging acceleration cavity, and the small end of the converging acceleration cavity is the light-emitting end.
[0017] According to a preferred embodiment, the body includes an air inlet and a nozzle connected to each other, the confluence acceleration chamber is disposed in the nozzle, the first air blowing channel and the second air blowing channel are both disposed in the air inlet, and the nozzle is detachably connected to the air inlet.
[0018] According to a preferred embodiment, the end face of the body near the light-emitting end is provided with a reflective surface recessed toward the light-incident end. The reflective surface and the space defined by the workpiece being welded constitute a heat storage space, and the laser channel is connected to the heat storage space.
[0019] According to a preferred embodiment, the wavelength of the laser beam is less than 550 nm.
[0020] A laser welding device includes a laser head and the aforementioned air blowing head. A focusing lens and a protective glass are sequentially arranged inside the laser head along the transmission direction of the laser beam. The air blowing head is mounted on the laser head and located downstream of the protective glass. The protective glass of this laser welding head can be kept clean, and the protective gas acting on the weld joint ensures that the weld joint is not oxidized, thus guaranteeing welding quality. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 A three-dimensional structural diagram of the air blowing head provided in an embodiment of this utility model;
[0023] Figure 2 A cross-sectional view of the laser head and air blowing head assembly structure provided in an embodiment of this utility model;
[0024] Figure 3 A schematic diagram of the protective gas flow state within the laser head and air blowing head assembly structure provided in this embodiment of the utility model;
[0025] Figure 4 This is a three-dimensional structural diagram of the air blowing head after the adapter is assembled, which is provided in the embodiment of this utility model.
[0026] Icons: 1. Main body; 10. Laser channel; 101. Light input end; 102. Light output end; 103. Converging acceleration cavity; 11. Air inlet; 111. First air blowing channel; 112. Second air blowing channel; 12. Nozzle; 120. Reflecting surface; 121. Heat storage space; 13. Adapter; 2. Laser head; 21. Focusing lens; 22. Protective glass; 3. Laser beam; 30. Optical axis centerline; 4. Workpiece to be welded; 41. Welding point; a. First airflow beam; a1. First branch; a2. Second branch; b. Second airflow beam; c. Combined airflow; A. First converging point; B. Second converging point. Detailed Implementation
[0027] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.
[0028] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
[0030] Please refer to Figures 1 to 4A blowing head, fitted to the end of the laser head 2, is used to protect the protective glass 22 and simultaneously guide protective gas to the welding area during laser welding. For ease of description, as... Figure 2 and Figure 3 As shown, the air blowing head and laser head 2 are assembled, and the cross-sectional structural diagram of their assembly is explained. It should be noted that the laser head 2 has a channel for the transmission of the laser beam 3, and a focusing lens 21 and a protective glass 22 are sequentially assembled in this channel along the transmission direction of the laser beam 3.
[0031] Specifically, the blowing head includes a body 1, through which a laser channel 10 is provided. The laser channel 10 is coaxial with the laser beam 3 and has an input end 101 and an output end 102. The laser beam 3 is transmitted from the input end 101 to the output end 102. A protective glass 22 is located on one side of the input end 101. A first blowing channel 111 and a second blowing channel 112 for supplying protective gas into the laser channel 10 are provided through the side wall of the body 1. The first blowing channel 111 is located between the second blowing channel 112 and the input end 101. The first blowing channel 111 is inclined towards the direction closer to the input end 101, and the second blowing channel 112 is inclined towards the direction closer to the output end 102. In this embodiment, the laser beam 3 from the laser head 2 is focused by a focusing lens 21, and its focal point is located on one side of the output end 102. In laser welding, the focal point of the laser beam 3 is projected onto the workpiece 4 being welded, generating fumes. Some of these fumes diffuse into the laser channel 10 through the light-emitting end 102. These fumes not only absorb the energy of the laser beam 3, affecting the welding quality, but also pose a risk of contaminating the protective glass 22 by moving towards the light-incident end 101. To prevent fumes from entering the laser channel 10 through the light-emitting end 102, and to effectively expel the fumes from the laser channel 10 to prevent contamination of the protective glass 22, protective gas is continuously supplied into the laser channel 10 through the first air-blowing channel 111 and the second air-blowing channel 112. Since the first air-blowing channel 111 is inclined towards the light-incident end 101, and the second air-blowing channel 112 is inclined towards the light-emitting end 102, as... Figure 3As shown, the protective gas input through the first blowing channel 111 flows toward the light-emitting end 102, i.e., the area where the protective glass 22 is located, and eventually impacts the side of the protective glass 22 facing the light-emitting end 102. After this part of the protective gas is blocked by the protective glass 22, an airflow layer is formed near the side of the protective glass 22 facing the light-emitting end 102, and moves toward the light-emitting end 102 at least along the inner wall of the laser channel 10 and is discharged from the laser channel 10. During this process, if some soot adheres to the protective glass 22, this soot will be removed by the protective gas input through the first air blowing channel 111, which will also effectively cool the protective glass 22. The removed soot, as well as the soot suspended in the laser channel 10, will be blocked by the airflow layer, preventing it from adhering to the protective glass 22. At the same time, as the protective gas moves from top to bottom and exits the laser channel 10, the soot in the laser channel 10 will move towards the light-emitting end 102 and be discharged. During the process of the protective gas being discharged from the light-emitting end 102, the protective gas can prevent soot from entering the laser channel 10 through the light-emitting end 102, and can also effectively disperse the air in the welding area of the workpiece 4 being welded, preventing the welding point 41 from oxidizing.
[0032] Furthermore, the protective gas entering the laser channel 10 through the second air blowing channel 112 flows toward the light-emitting end 102. It can be understood that the protective gas entering the laser channel 10 through the first air blowing channel 111 and the second air blowing channel 112 is discharged through the light-emitting end 102. Therefore, the protective gas in the laser channel 10 will at least converge at the light-emitting end 102. The protective gas entering the laser channel 10 through the second air blowing channel 112 can, on the one hand, replenish the protective gas entering the laser channel 10 through the first air blowing channel 111, ensuring that the weld area of the welded workpiece 4 is not oxidized; on the other hand, it can accelerate the protective gas entering the laser channel 10 through the first air blowing channel 111 and flowing between the second air blowing channel 112 and the light-emitting end 102, thereby forming a low-pressure environment in this area of the laser channel 10. This is more conducive to the smoke and dust in the laser channel 10 moving toward this area under pressure and being discharged with the protective gas.
[0033] Optionally, the inner diameter of the laser channel 10 gradually decreases from the light-incident end 101 to the light-exit end 102. This configuration causes the flow area to gradually decrease from the light-incident end 101 to the light-exit end 102, i.e., in the direction of protective gas discharge. Therefore, the protective gas is in a state of gradual acceleration along the protective gas discharge path. This also results in relatively low pressure near the light-exit end 102 within the laser channel 10, which is more conducive to the movement and concentration of dust within the laser channel 10 towards the light-exit end 102, and facilitates the complete discharge of dust from the laser channel 10.
[0034] Preferably, the laser channel 10 is a rotary cavity.
[0035] Preferably, there are multiple first air blowing channels 111, which are evenly distributed along the circumferential spacing of the laser channel 10. Further, there are multiple second air blowing channels 112, which are evenly distributed along the circumferential spacing of the laser channel 10. In this embodiment, there are four first air blowing channels 111 and four second air blowing channels 112, to form a stable, uniform, and sufficient protective gas flow within the laser channel 10.
[0036] like Figure 1 and Figure 4 As shown, both the first air blowing channel 111 and the second air blowing channel 112 are equipped with adapters 13 for connecting to an external air source. To avoid interference when assembling the adapters 13, the first air blowing channel 111 and the second air blowing channel 112 are offset in the circumferential direction of the body 1. Of course, in another embodiment, if the assembly of the adapters 13 does not cause interference, the first air blowing channel 111 and the second air blowing channel 112 can also be aligned or not offset in the circumferential direction of the body 1. Figure 2 and Figure 3 As shown, since this embodiment involves the first air blowing channel 111 and the second air blowing channel 112 being misaligned in the circumferential direction of the body 1, for ease of description, the air blowing head is constructed such that the first air blowing channel 111 and the second air blowing channel 112 are aligned or not misaligned in the circumferential direction of the body 1. The first air blowing channel 111 is represented by a dashed line. It should be noted that whether the first air blowing channel 111 and the second air blowing channel 112 are misaligned in the circumferential direction of the body 1 does not affect the flow mode of the protective gas in the laser channel 10, but only serves to prevent the adapter 13 from interfering with each other.
[0037] like Figure 3As shown, the protective gas entering the laser channel 10 through the first blowing channel 111 forms a first airflow beam a. Multiple first airflow beams a corresponding to multiple first blowing channels 111 converge at a first convergence point A within the laser channel 10. After colliding at the first convergence point A, the first airflow beam a splits, mainly forming a first branch a1 and a second branch a2. The first branch a1 first diffuses and flows along the protective glass 22 towards the periphery of the first convergence point A, and then moves towards the light-emitting end 102 while adhering to the inner wall of the laser head 2 and the blowing head. The second branch a2 moves towards the light-emitting end 102 in a direction parallel to the optical axis centerline 30 of the laser beam 3. The first branch a1 forms an airflow layer on the side wall of the protective glass 22 facing the light-emitting end 102, as well as on the inner wall of the laser head 2 and the inner wall of the blowing head, effectively preventing dust from adhering. Simultaneously, it drives dust in the vicinity of the first branch a1 towards the light-emitting end 102. The second branch a2 is closer to the optical axis centerline 30 of the laser beam 3 than the first branch a1, meaning it is closer to the central region of the laser channel 10. Therefore, as the second branch a2 flows towards the light-emitting end 102, it forms a stable airflow near the central region of the laser channel 10, driving the dust present in that region towards the light-emitting end 102. Thus, the synergistic effect of the first branch a1 and the second branch a2 maximizes the prevention of dust adhesion within the protective glass 22, laser head 2, and laser channel 10. Simultaneously, it generates low pressure in the airflow path region, effectively driving the dust suspended within the laser channel 10 towards the light-emitting end 102 and expelling it from the laser channel 10.
[0038] Preferably, the first convergence point A is located on the optical axis centerline 30 of the laser beam 3. More preferably, the first convergence point A is located on the side of the protective glass 22 near the light-emitting end 102. Since the laser beam 3 is coaxial with the laser channel 10, when the first convergence point A is located on the optical axis centerline 30 of the laser beam 3 and on the side of the protective glass 22 near the light-emitting end 102, the first convergence point A coincides with the center point of the protective glass 22 facing the light-emitting end 102. Multiple first airflow streams a collide with each other at the first convergence point A and are blocked by the protective glass 22. Thus, the first airflow streams a can be split into a uniform first branch a1 and a uniform second branch a2 at the first convergence point A, making the airflow uniform throughout the laser channel 10. This ensures that the degree of dust treatment is relatively uniform throughout the space within the laser channel 10, especially throughout the space along the transmission path of the laser beam 3, thereby ensuring the stability of the laser beam 3 and the stability of the welding quality. Meanwhile, the first convergence point A is located at the center of the protective glass 22, which makes the cooling effect of the first airflow a on the central area of the protective glass 22 stable and effective. The central area of the protective glass 22 coincides with the propagation path of the laser beam 3, thus ensuring that the protective glass 22 has stable light transmission performance during the welding process, thereby ensuring the stability of the laser beam 3 transmission and thus ensuring the stability of the welding quality.
[0039] A second airflow beam b is formed by the protective gas entering the laser channel 10 through the second air blowing channel 112. Multiple second airflow beams b corresponding to multiple second air blowing channels 112 converge at a second convergence point B within the laser channel 10. The first airflow beam a collides and splits at the first convergence point A, then merges with the second airflow beam b at the second convergence point B to form a combined airflow beam c, which is then discharged from the laser channel 10 through the light-emitting end 102. Further, the second convergence point B is located on the optical axis centerline 30 of the laser beam 3. Preferably, in this embodiment, both the first convergence point A and the second convergence point B are located on the optical axis centerline 30. This allows for the formation of a stable combined airflow beam c downstream of the second convergence point B, creating a stable airflow blockage at the light-emitting end 102. This effectively prevents dust from entering the laser channel 10 from the light-emitting end 102, while simultaneously effectively discharging dust entering the laser channel 10 and uniformly dispersing the air around the solder joint 41, resulting in a uniform distribution of the protective gas in the solder joint area and ensuring the stability of the welding quality.
[0040] Optionally, the region of the laser channel 10 near the light-emitting end 102 is cone-shaped, forming a converging acceleration cavity 103, with the smaller end of the converging acceleration cavity 103 being the light-emitting end 102. Through the gradually decreasing flow channel design, the velocity of the combined airflow c gradually increases, creating a low-pressure environment here to drive the smoke and dust in the laser channel 10 to be better discharged from the laser channel 10 through the light-emitting end 102.
[0041] In this embodiment, the body 1 includes an air inlet 11 and a nozzle 12 connected to each other. A confluence acceleration chamber 103 is disposed on the nozzle 12. The first air blowing channel 111 and the second air blowing channel 112 are both disposed on the air inlet 11. The nozzle 12 is detachably connected to the air inlet 11. Preferably, the nozzle 12 is threadedly connected to the air inlet 11. This facilitates nozzle 12 replacement.
[0042] like Figure 2 As shown, the angle between the axis of the first air blowing channel 111 and the center line 30 of the optical axis of the laser beam 3 is α, where α = 30°-60°. Preferably, α = 45°. The angle between the axis of the second air blowing channel 112 and the center line 30 of the optical axis of the laser beam 3 is β, where β = 30°-60°. Preferably, β = 45°.
[0043] like Figure 2 and Figure 3 As shown, a reflective surface 120 is disposed on the end face of the main body 1 near the light-emitting end 102, recessed towards the light-incident end 101. The space defined by the reflective surface 120 and the workpiece 4 to be welded constitutes a heat storage space 121, and the laser channel 10 is connected to the heat storage space 121. In this embodiment, the shape of the reflective surface 120 may optionally include, but is not limited to, a spherical surface, an elliptical surface, or a conical surface. During the welding process, part of the light reflected by the workpiece 4 to be welded is reflected back to the weld joint area under the action of the reflective surface 120, which greatly improves the heating effect of the weld joint area, enhances the absorption rate of the laser beam 3 by the workpiece 4 to be welded, and realizes deep and stable welding of highly reflective materials such as copper.
[0044] Preferably, the reflecting surface 120 is spherical. The distance between the center of the reflecting surface 120 and the center line 30 of the optical axis of the laser beam 3 is 0-1 mm. Preferably, the distance between the center of the reflecting surface 120 and the center line 30 of the optical axis of the laser beam 3 is 0 mm, that is, the center of the reflecting surface 120 is on the center line 30 of the optical axis of the laser beam 3. In this way, the focal point of the beam reflected by the reflecting surface 120 is closer to the center of the solder joint 41.
[0045] Furthermore, the center of the reflective surface 120 coincides with the focal point of the laser beam 3. This causes the focal point of the beam reflected by the reflective surface 120 to coincide with the center of the welding point 41, achieving optimal heating effect.
[0046] In this embodiment, the radius of the reflective surface 120 is between 5mm and 10mm. Preferably, the radius of the reflective surface 120 is 7.5mm.
[0047] like Figure 2 and Figure 3As shown, in the horizontal direction, the width of the heat storage space 121 is greater than the width of the outlet end. This means that after the combined airflow c exits the laser channel 10 through the light-emitting end 102, its flow path widens. Therefore, the flow velocity of the combined airflow c entering the heat storage space 121 slows down and quickly fills the heat storage space 121, then diffuses outwards to disperse the air around the area, i.e., the solder joint 41, effectively preventing the solder joint 41 from being oxidized. At the same time, the slowing speed of the combined airflow c reduces the impact force on the solder joint 41, further reducing the cooling effect of the combined airflow c on the solder joint 41, ensuring the welding depth and quality.
[0048] Optionally, the gas may include, but is not limited to, nitrogen or an inert gas.
[0049] like Figure 2 and Figure 3 As shown, this embodiment also provides a laser welding device, including a laser head 2 and the aforementioned air blowing head. A focusing lens 21 and a protective glass 22 are sequentially arranged inside the laser head 2 along the transmission direction of the laser beam 3. The air blowing head is mounted on the laser head 2 and is located downstream of the protective glass 22. Based on the aforementioned air blowing head, the protective glass 22 of this laser welding head can remain clean, and the protective gas acting on the weld point 41 ensures that the weld point 41 is not oxidized, thus guaranteeing welding quality. In this embodiment, the laser beam 3 can be a blue laser and / or an infrared laser. In embodiments where the air blowing head is configured with a reflective surface 120, it is more preferably applied to blue laser processing scenarios, or to processing scenarios where the laser wavelength is less than 550nm. This allows the heat storage space 121 to heat the weld point area of the workpiece 4, thereby increasing the absorption rate of highly reflective materials such as copper to short-wavelength lasers and achieving better welding results. Of course, it can also be applied to scenarios involving composite welding of red and blue lasers.
[0050] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.
Claims
1. An air blowing head, characterized in that, Includes a body (1), through which a laser channel (10) is provided. The laser channel (10) is coaxial with the laser beam (3). The laser channel (10) has an input end (101) and an output end (102). The laser beam (3) is transmitted from the input end (101) to the output end (102). The protective glass (22) is located on one side of the light-incident end (101); The side wall of the main body (1) is provided with a first air blowing channel (111) and a second air blowing channel (112) for delivering protective gas into the laser channel (10), and the first air blowing channel (111) is located between the second air blowing channel (112) and the light input end (101). The first air blowing channel (111) is inclined toward the light-incident end (101), and the second air blowing channel (112) is inclined toward the light-outceasing end (102).
2. The air blowing head according to claim 1, characterized in that, There are multiple first air blowing channels (111), and the multiple first air blowing channels (111) are evenly distributed at circumferential intervals along the laser channel (10).
3. The air blowing head according to claim 1, characterized in that, There are multiple second air blowing channels (112), and the multiple second air blowing channels (112) are evenly distributed along the circumferential interval of the laser channel (10).
4. The air blowing head according to claim 1, characterized in that, There are multiple first air blowing channels (111). The protective gas entering the laser channel (10) through the first air blowing channel (111) forms a first airflow stream (a). The multiple first airflow streams (a) corresponding to the multiple first air blowing channels (111) converge at a first convergence point (A) in the laser channel (10).
5. The air blowing head according to claim 4, characterized in that, The first convergence point (A) is located on the optical axis center line (30) of the laser beam (3).
6. The air blowing head according to claim 5, characterized in that, The first convergence point (A) is located on the side of the protective glass (22) near the light-emitting end (102).
7. The air blowing head according to any one of claims 4-6, characterized in that, There are multiple second air blowing channels (112). The protective gas entering the laser channel (10) through the second air blowing channel (112) forms a second air flow stream (b). The multiple second air flow streams (b) corresponding to the multiple second air blowing channels (112) converge at the second convergence point (B) in the laser channel (10). After the first airflow stream (a) collides and splits at the first converging point (A), it merges with the second airflow stream (b) at the second converging point (B) to form a combined airflow stream (c), and is discharged from the laser channel (10) through the light-emitting end (102).
8. The air blowing head according to claim 7, characterized in that, The second convergence point (B) is located on the optical axis center line (30) of the laser beam (3).
9. The air blowing head according to claim 1, characterized in that, The region of the laser channel (10) near the light-emitting end (102) is cone-shaped, forming a busbar acceleration cavity (103), and the small end of the busbar acceleration cavity (103) is the light-emitting end (102).
10. The air blowing head according to claim 9, characterized in that, The main body (1) includes an air intake (11) and a nozzle (12) connected to each other. The confluence acceleration chamber (103) is disposed on the nozzle (12). The first air blowing channel (111) and the second air blowing channel (112) are both disposed on the air intake (11). The nozzle (12) is detachably connected to the air intake (11).
11. The air blowing head according to claim 1, characterized in that, The end face of the body (1) near the light-emitting end (102) is provided with a reflective surface (120) recessed toward the light-incident end (101). The space defined by the reflective surface (120) and the workpiece (4) being welded constitutes a heat storage space (121). The laser channel (10) is connected to the heat storage space (121).
12. The air blowing head according to claim 1, characterized in that, The wavelength of the laser beam (3) is less than 550 nm.
13. A laser welding device, characterized in that, The laser head (2) includes a laser head (2) and an air blowing head as described in any one of claims 1-12. A focusing lens (21) and the protective glass (22) are sequentially arranged inside the laser head (2) along the transmission direction of the laser beam (3). The air blowing head is assembled to the laser head (2) and is located downstream of the protective glass (22).