A blow head and laser welding apparatus

Abstract

The utility model provides a kind of blowing head and laser welding equipment, blowing head includes body, the body is passed through and is provided with laser channel, the laser channel has light inlet end and light outlet end, the laser beam is transmitted from light inlet end to light outlet end;Protective glass is at the light inlet end side;The sidewall of the body is passed through and is provided with the blowing channel for conveying protective gas to the laser channel;The end face of the body close to the light outlet end is configured with the spherical reflecting surface recessed towards the light inlet end, the spherical reflecting surface and the space defined by the welded workpiece constitute heat storage space, the laser channel is communicated to the heat storage space inside.The utility model can reduce the influence of protective gas on the cooling of weld point area, improve the absorption rate of the welded piece to laser, ensure welding depth and quality.

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 workpiece. 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 laser welding head's output end. The air blowing head is hollow and has a laser channel. A protective gas source is connected to the air blowing head, and by introducing protective gas into the laser channel, an 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 at the outlet area of ​​the air blowing head, i.e., the laser welding area, preventing weld joint oxidation.

[0003] However, when the protective gas overflows from the light-emitting end, it inevitably impacts the solder joint area, causing the temperature of the solder joint area to drop, reducing the laser absorption rate, and thus affecting the soldering 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 reduce the impact of the protective gas on the cooling of the weld area, improve the absorption rate of the welded parts to the laser, and ensure the welding depth and quality.

[0005] The second objective of this invention is to provide a laser welding device that can ensure that the weld joint is not oxidized, while reducing the cooling effect of the shielding gas on the weld joint area, thus ensuring the welding depth and quality.

[0006] The embodiments of this utility model are achieved through the following technical solutions:

[0007] A blower head includes a body with a laser channel extending through it. The laser channel has an input end and an output end, and a laser beam is transmitted from the input end to the output end. A protective glass is located on the side of the input end. A blower channel for supplying protective gas into the laser channel is provided through the side wall of the body. A spherical reflective surface is disposed on the end face of the body near the output end, recessed towards the input end. The spherical reflective surface and the space defined by the workpiece to be welded form a heat storage space, and the laser channel is connected to the heat storage space. Part of the light reflected by the workpiece to be welded is reflected back to the weld joint area by the spherical reflective surface, greatly improving the heating effect of the weld joint area, thereby reducing the impact of the protective gas on the cooling of the weld joint area, increasing the absorption rate of the laser beam by the workpiece to be welded, and achieving deep and stable welding of highly reflective materials such as copper. After the shielding gas exits the laser channel through the light-emitting end, its flow path widens. Therefore, the flow rate of the shielding gas entering the heat storage space slows down, and it expands rapidly to fill the heat storage space. It then diffuses outwards, dispersing the air around the solder joint and effectively preventing oxidation. Simultaneously, the slower speed of the shielding gas reduces the impact on the solder joint, further minimizing its cooling effect and ensuring welding depth and quality.

[0008] According to a preferred embodiment, the distance between the center of the spherical reflective surface and the center line of the optical axis of the laser beam is 0-2 mm.

[0009] According to a preferred embodiment, the center of the spherical reflective surface is located on the optical axis center line of the laser beam.

[0010] According to a preferred embodiment, the center of the spherical reflective surface coincides with the focal point of the laser beam.

[0011] According to a preferred embodiment, the radius of the spherical reflective surface is 5mm-10mm.

[0012] According to a preferred embodiment, the body includes an air intake and a nozzle connected to each other, and the spherical reflective surface is disposed on the nozzle; the nozzle is rotatably connected to the air intake.

[0013] According to a preferred embodiment, the center of the spherical reflective surface does not coincide with the center line of the optical axis of the laser beam.

[0014] According to a preferred embodiment, the air blowing channel includes a first air blowing channel and a second air blowing channel, wherein the first air blowing channel is located between the second air blowing channel and the light-incident end; the first air blowing channel is inclined toward the direction close to the light-incident end, and the second air blowing channel is inclined toward the direction close to the light-out end.

[0015] According to a preferred embodiment, the laser channel is coaxial with the laser beam.

[0016] 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. This laser welding device ensures that the weld joint is not oxidized, while reducing the cooling effect of the shielding gas on the weld joint area, thus guaranteeing weld depth and quality.

[0017] According to a preferred embodiment, the wavelength of the laser beam is less than 550 nm. Attached Figure Description

[0018] 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.

[0019] Figure 1 A three-dimensional structural diagram of the air blowing head provided in an embodiment of this utility model;

[0020] Figure 2 A cross-sectional view of the laser head and air blowing head assembly structure provided in an embodiment of this utility model;

[0021] 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;

[0022] Figure 4 A three-dimensional structural diagram of the air blowing head after assembling the adapter, provided in an embodiment of this utility model;

[0023] Figure 5 A cross-sectional view of the air blowing head provided in another embodiment of this utility model;

[0024] Figure 6 for Figure 5 The diagram shows the light spot projected onto the workpiece after the air blowing head is assembled with the laser head.

[0025] 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. Spherical reflector; 1200. Center of sphere; 1201. Auxiliary spot; 121. Heat storage space; 122. Driven gear; 13. Adapter; 14. Bearing; 15. Motor; 151. Drive gear; 2. Laser head; 21. Focusing lens; 22. Protective glass; 3. Laser beam; 30. Optical axis centerline; 4. Workpiece to be welded; 41. Welding point; 410. Welding spot; 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

[0026] 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.

[0027] 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.

[0028] 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.

[0029] Please refer to Figures 1 to 4 A blowing head, fitted to the end of the laser head 2, is used to protect the protective glass 22 and simultaneously guide protective gas into the weld joint 41 area during laser welding. For ease of description, as... Figure 2 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.

[0030] 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. 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 input end 101. A blowing channel for supplying protective gas into the laser channel 10 is provided through the side wall of the body 1. A spherical reflective surface 120 is provided on the end face of the body 1 near the output end 102, which is recessed towards the input end 101. The spherical reflective surface 120 and the space defined by the workpiece 4 being welded constitute a heat storage space 121. The laser channel 10 is connected to the heat storage space 121. During the welding process, part of the light reflected by the workpiece 4 being welded is reflected back to the weld point 41 area under the action of the spherical reflective surface 120, which greatly improves the heating effect of the weld point 41 area, thereby reducing the impact of the shielding gas on the cooling of the weld point 41 area, increasing the absorption rate of the laser beam 3 of the workpiece 4 being welded, and realizing deep and stable welding of highly reflective materials such as copper.

[0031] Furthermore, such as Figure 2 and Figure 3 As 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 protective gas exits the laser channel 10 through the light-emitting end 102, its flow path widens. Therefore, the flow rate of the protective gas entering the heat storage space 121 slows down and expands rapidly to fill the heat storage space 121, and then diffuses outwards, thus dispersing 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 slowed speed of the protective gas reduces the impact force on the solder joint 41, further reducing the cooling effect of the protective gas on the solder joint 41, ensuring the welding depth and quality.

[0032] Optionally, the gas may include, but is not limited to, nitrogen or an inert gas.

[0033] Of course, in some embodiments, the laser beam 3 and the laser channel 10 may be coaxial, as long as their extension directions are parallel.

[0034] In some embodiments, the distance between the center 1200 of the spherical reflective surface 120 and the optical axis centerline 30 of the laser beam 3 is 0-2 mm. Preferably, the distance between the center 1200 of the spherical reflective surface 120 and the optical axis centerline 30 of the laser beam 3 is 0-1 mm. More preferably, the distance between the center 1200 of the spherical reflective surface 120 and the optical axis centerline 30 of the laser beam 3 is 0 mm, that is, the center 1200 of the spherical reflective surface 120 is on the optical axis centerline 30 of the laser beam 3. In this way, the focal point of the beam reflected by the spherical reflective surface 120 is closer to the center of the solder joint 41.

[0035] Furthermore, the center 1200 of the spherical reflector 120 coincides with the focal point of the laser beam 3. This causes the focal point of the beam reflected by the spherical reflector 120 to coincide with the center of the welding point 41, achieving optimal heating effect.

[0036] In this embodiment, the radius of the spherical reflective surface 120 is between 5mm and 10mm. Preferably, the radius of the spherical reflective surface 120 is 7.5mm.

[0037] like Figure 2 and Figure 3 As shown, the air blowing channel includes a first air blowing channel 111 and a second air blowing channel 112. The first air blowing channel 111 is located between the second air blowing channel 112 and the light-incident end 101. 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-outceasing end 102. In this embodiment, the laser beam 3 from the laser head 2 is focused by the focusing lens 21, and its focal point is located on the side of the light-outceasing end 102. During laser welding, the focal point of the laser beam 3 is projected onto the workpiece 4 to be welded and generates fumes. Some of these fumes diffuse into the laser channel 10 through the light-outceasing end 102. These fumes not only absorb the energy of the laser beam 3 and affect the welding quality, but also pose a risk of moving towards the light-incident end 101 and contaminating the protective glass 22. To prevent dust from entering the laser channel 10 through the light-emitting end 102, and to effectively expel dust from the laser channel 10 to prevent contamination of the protective glass 22, protective gas is continuously supplied to the laser channel 10 through the first air blowing channel 111 and the second air blowing channel 112. 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. 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 area of ​​the weld point 41 on the workpiece 4 being welded, preventing the weld point 41 from oxidizing.

[0038] 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 point 41 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 dust in the laser channel 10 moving toward this area under pressure and being discharged with the protective gas.

[0039] 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.

[0040] Preferably, the laser channel 10 is a rotary cavity.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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 41 area and ensuring the stability of the welding quality.

[0046] 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.

[0047] 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.

[0048] 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°.

[0049] like Figure 5 As shown, another embodiment of the air blowing head is provided. Compared with the air blowing head provided in the previous embodiment, the difference lies in the assembly form of the air inlet 11 and the nozzle 12, and the spherical reflective surface 120 provided on the nozzle 12. All other structures are the same, and the same structures will not be described again here.

[0050] Specifically, such as Figure 5 As shown, the body 1 includes an air inlet 11 and a nozzle 12 connected to each other, with a spherical reflective surface 120 disposed on the nozzle 12; the nozzle 12 is rotatably connected to the air inlet 11. Optionally, the nozzle 12 is rotatably connected to the air inlet 11 via a bearing 14. Further, the center 1200 of the spherical reflective surface 120 does not coincide with the optical axis centerline 30 of the laser beam 3. Preferably, the center 1200 of the spherical reflective surface 120 is located on the workpiece 4 to be welded. Since the center 1200 of the spherical reflective surface 120 does not coincide with the optical axis centerline 30 of the laser beam 3, that is, on the workpiece 4 to be welded, there is an offset radius between the center 1200 and the weld point 41. Figure 6 As shown, during the welding process, the laser beam 3 forms a welding spot 410 at the weld point 41. The beam reflected by the workpiece 4 is reflected by the spherical reflector 120 and focused at the center 1200, forming an auxiliary spot 1201. When the nozzle 12 rotates, the auxiliary spot 1201 rotates around the welding spot 410 with the offset radius as the radius to form an annular spot, which preheats the annular spot area. This helps to improve the absorption rate of the laser beam 3 by the workpiece 4 and also helps to expand the molten pool area, reduce the amount of spatter, i.e., fumes, and further reduce the probability of the protective glass 22 being contaminated, which is beneficial to improving the welding depth and quality.

[0051] In this embodiment, the auxiliary spot 1201 and the welding spot 410 do not overlap.

[0052] In another embodiment, the auxiliary spot 1201 and the welding spot 410 at least partially overlap.

[0053] Optionally, the offset radius is D, where 0 < D ≤ 2 mm.

[0054] Preferably, 0 < D ≤ 1 mm. More preferably, D = 0.5 mm.

[0055] like Figure 5 As shown, a motor 15 is installed on the outer wall of the air intake 11. The drive shaft of the motor 15 is connected to a drive gear 151, and a driven gear 122 meshes with the drive gear 151 on the outer sleeve of the nozzle 12. The motor 15 drives the drive gear 151, which in turn drives the nozzle 12 to rotate via the driven gear 122. In this embodiment, the laser beam 3 is coaxial with the laser channel 10, and the rotation axis of the nozzle 12 coincides with the optical axis centerline 30 of the laser beam 3.

[0056] like Figure 2 , Figure 3 as well as Figure 5 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, this laser welding device can ensure that the weld point 41 is not oxidized, while reducing the cooling effect of the protective gas on the weld point 41 area, ensuring welding depth and quality. In this embodiment, the laser beam 3 can be a blue laser and / or an infrared laser. It is better applied to blue laser processing scenarios, or to processing scenarios where the laser wavelength is less than 550nm, thereby heating the weld point 41 area of ​​the workpiece 4 to be welded through the heat storage space 121, thereby improving 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 of composite welding with red and blue lasers.

[0057] 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) having an input end (101) and an output end (102), and a 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); A blowing channel for supplying protective gas into the laser channel (10) is provided through the side wall of the main body (1); The end face of the main body (1) near the light-emitting end (102) is provided with a spherical reflective surface (120) recessed toward the light-incident end (101). The space defined by the spherical 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).

2. The air blowing head according to claim 1, characterized in that, The distance between the center (1200) of the spherical reflective surface (120) and the center line (30) of the optical axis of the laser beam (3) is 0-2 mm.

3. The air blowing head according to claim 1, characterized in that, The center (1200) of the spherical reflective surface (120) is located on the optical axis center line (30) of the laser beam (3).

4. The air blowing head according to claim 1, characterized in that, The center (1200) of the spherical reflective surface (120) coincides with the focal point of the laser beam (3).

5. The air blowing head according to claim 1, characterized in that, The radius of the spherical reflective surface (120) is 5mm-10mm.

6. The air blowing head according to claim 1, characterized in that, The body (1) includes an air intake (11) and a nozzle (12) connected to each other, and the spherical reflective surface (120) is disposed on the nozzle (12); The nozzle (12) is rotatably connected to the air intake (11).

7. The air blowing head according to claim 6, characterized in that, The center (1200) of the spherical reflective surface (120) does not coincide with the center line (30) of the optical axis of the laser beam (3).

8. The air blowing head according to claim 1, characterized in that, The air blowing channel includes a first air blowing channel (111) and a second air blowing channel (112), wherein the first air blowing channel (111) is located between the second air blowing channel (112) and the light-incident 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).

9. The air blowing head according to claim 1, characterized in that, The laser channel (10) is coaxial with the laser beam (3).

10. 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 1-9. 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).

11. The laser welding equipment according to claim 10, characterized in that, The wavelength of the laser beam (3) is less than 550 nm.

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