Double-light-spot laser welding system and welding gun

Abstract

The invention discloses a double-light-spot welding system and a welding gun. The welding system comprises a first light path and a second light path, the first light path is sequentially provided with a first light source, a first collimating mirror, a first reflecting mirror, a second reflecting mirror and a first focusing mirror, the first reflecting mirror and the second reflecting mirror are arranged in a swinging mode, and the swinging axes are perpendicular to each other; the second light path is sequentially provided with a second light source, a second collimating mirror, a third reflecting mirror, a fourth reflecting mirror and a second focusing mirror, the third reflecting mirror and the fourth reflecting mirror are arranged in a swinging mode, and the swinging axes are perpendicular to each other; the first focus lens and the second focus lens have the same focal length. The welding gun comprises a left gun body, a right gun body, a gun barrel and the double-light-spot welding system, and the first light path and the second light path are arranged in the left gun body and the right gun body respectively. According to the scheme, the whole structure is simple, the power range is wider, and the welding quality can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of laser welding devices, and in particular relates to a double-spot welding system and a welding gun. Background Art

[0002] Currently, low-power laser welding has been widely used in various metal processing industries. However, when welding thicker plates, simply increasing the laser beam power will not only fail to achieve the desired improvement in penetration depth, but will also cause defects such as significantly larger spatter and poor weld formation.

[0003] In the prior art, a larger ring laser beam is applied around a small laser beam or a low-power laser spot to form a double beam to solve the above problem. However, the double beam lasers currently available on the market are expensive and very expensive to maintain and repair. On the other hand, Figure 1 As shown, the two beams in the existing design have their own collimating mirrors and reflectors, ultimately passing through the same focusing mirror to achieve overlapping dot-ring or double-ring beams, thus achieving a dot-ring or double-ring focal spot. The drawback of this design is that it can only achieve combinations of different wavelengths. For example, combining an infrared laser with a wavelength of approximately 1000nm with a blue laser with a wavelength of approximately 450nm requires a combination of semiconductor lasers and fiber lasers. This results in a relatively narrow output power range, relatively poor beam quality, and a complex system. Summary of the Invention

[0004] To address the deficiencies in the prior art, the present invention provides a dual-spot welding system and a welding gun, which have a simple overall structure and a wider power range, thereby helping to improve welding quality.

[0005] In order to achieve the purpose of the present invention, the following scheme is proposed: A dual-spot welding system comprises: a first optical path and a second optical path; The first optical path is provided with a first light source, a first collimating mirror, a first reflecting mirror, a second reflecting mirror and a first focusing mirror in sequence, and the first reflecting mirror and the second reflecting mirror are swingably arranged, and the swing axes are perpendicular to each other; The second optical path is provided with a second light source, a second collimating mirror, a third reflecting mirror, a fourth reflecting mirror and a second focusing mirror in sequence, and the third reflecting mirror and the fourth reflecting mirror are swingably arranged, and the swing axes are perpendicular to each other; The focal lengths of the first focusing mirror and the second focusing mirror are the same.

[0006] A dual-spot welding gun, comprising a left gun body, a right gun body, a gun barrel and the aforementioned dual-spot welding system; The first light source, the first collimating mirror, the first reflecting mirror, the second reflecting mirror and the first focusing mirror are arranged in the left gun body; The second light source, the second collimating mirror, the third reflecting mirror, the fourth reflecting mirror and the second focusing mirror are arranged in the right gun body; The upper ends of the left gun body and the right gun body are connected, the lower ends of the left gun body and the right gun body are connected to the upper end of the gun barrel, and the focal points of the first focusing mirror and the second focusing mirror are located outside the lower end of the gun barrel.

[0007] The beneficial effects of the present invention are: 1. The welding system consists of an independent first optical path and a second optical path, and finally forms a double spot through a separate focusing lens. The output power range is larger and the applicable laser wavelength range is wider, making the laser welding stable, spatter-free, well-formed, and the penetration depth and surface width meet the required ideal effects.

[0008] 2. The first optical path and the second optical path are combined in the same welding gun, which has a compact structure and simple maintenance. The beam trajectory and beam geometry of the first optical path and the second optical path can be adjusted separately. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present invention.

[0010] Figure 1 The dual-light path structure of the prior art is shown.

[0011] Figure 2 The dual-light path structure of the dual-spot welding system of the present application is shown.

[0012] Figure 3 The figure shows a schematic structural diagram of the welding gun of the present application.

[0013] Figure 4 A cross-sectional view of the welding gun of the present application is shown.

[0014] Figure 5 A schematic structural diagram of the other side of the welding gun of the present application is shown.

[0015] Figure 6 Shown Figure 5 A partial enlarged view of point A in the middle.

[0016] Markings in the figure: first collimating mirror -11, first reflecting mirror -12, second reflecting mirror -13, first focusing mirror -14, first light source -15, second collimating mirror -21, third reflecting mirror -22, fourth reflecting mirror -23, second focusing mirror -24, second light source -25, protective lens -1, driving motor -2, left gun body -3, pin -31, right gun body -4, barrel -5, screw -51, strip hole -52, nozzle -53. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0019] It should be noted that in the description of the present invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are used solely to facilitate the description of the present invention and to simplify the description. Terms such as "first" and "second" are used solely to distinguish between descriptions and should not be construed as indicating or implying relative importance. Terms such as "parallel" and "perpendicular" do not necessarily require components to be absolutely parallel or perpendicular, but rather allow for slight tilting.

[0020] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections via an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0021] Example 1, as Figure 2 As shown, a dual-spot welding system includes: a first light path and a second light path.

[0022] Specifically, such as Figure 2 As shown, the first optical path is provided with a first light source 15, a first collimating mirror 11, a first reflecting mirror 12, a second reflecting mirror 13 and a first focusing mirror 14 in sequence. The first reflecting mirror 12 and the second reflecting mirror 13 are swingably arranged, and the swing axes are perpendicular to each other.

[0023] Specifically, such as Figure 2 As shown, the second optical path is provided with a second light source 25, a second collimating mirror 21, a third reflector 22, a fourth reflector 23 and a second focusing mirror 24 in sequence. The third reflector 22 and the fourth reflector 23 are swingably arranged, and the swing axes are perpendicular to each other.

[0024] The first focusing mirror 14 and the second focusing mirror 24 have the same focal length.

[0025] In this solution, the wavelengths of the first light source 15 and the second light source 25 can be the same or different, because the two groups of light paths are independently designed, independently controlled, and do not interfere with each other. The focus is only overlapped at the focus point after the output at the end of the light path through the entire gun structure. Therefore, the two light sources can use lasers of the same wavelength or two lasers of different wavelengths. In a conventional light path, two groups of light sources enter the gun body from the laser and the QBH light source. The light path design mainly includes independent collimation systems and / or galvanometer reflection systems. The two groups of light sources are combined into one by the same focusing mirror of the beam combining system. That is, usually light source A is incident on the reflective surface of the beam combining mirror at 45 degrees, and is incident on the focusing mirror after reflection. Light source B is incident on the focusing mirror after being transmitted at 45 degrees from the other side of the beam combining mirror. The working principle of the beam combining mirror itself can only realize reflection on one side and transmission on the other side. The coating layer characteristics of the reflective surface and the transmission surface are different, and it is impossible to achieve the purpose of both reflection and transmission of two groups of lasers of the same wavelength. Therefore, the dual-light path welding of the existing technology is limited to the beam combining of lasers of different wavelengths.

[0026] Specifically, the first light source 15 and the second light source 25 can be set as red laser or blue laser, for example, the first light source 15 is an infrared laser and the second light source 25 is a blue laser; the first light source 15 is an infrared laser and the second light source 25 is an infrared laser; the first light source 15 is a blue laser and the second light source 25 is a blue laser.

[0027] During the welding process, the first reflector 12 and the second reflector 13 swing back and forth within a predetermined angle range. The first reflector 12 and the second reflector 13 can swing simultaneously or separately, and the third reflector 22 and the fourth reflector 23 remain fixed, so that the focus of the second focusing mirror 24 can remain fixed to form a point-shaped light spot, and the focus of the second focusing mirror 24 is the focus of the entire gun; and the focal point of the first focusing mirror 14 will orbit around the focus of the second focusing mirror 24 to form an annular light spot. When the first reflector 12 and the second reflector 13 swing at the same time and at the same speed, the annular light spot is a circular ring structure. According to needs, the first reflector 12 and the second reflector 13 can also be moved separately or swung at different speeds to form an annular light spot with a polygonal structure; as another embodiment, the third reflector 22 and the fourth reflector 23 can also be swung back and forth to keep the first reflector 12 and the second reflector 13 fixed.

[0028] Preferably, the angle between the first optical path and the second optical path is adjustable. After adjusting the angle, the first focusing lens 14 and the second focusing lens 24 with the same focal length are replaced to change the focal length of the entire gun, thereby achieving the purpose of adjusting the focal length of the entire gun.

[0029] Example 2, as Figures 3 to 5As shown, a dual-spot welding gun includes a left gun body 3, a right gun body 4, a gun barrel 5, and the dual-spot welding system described in Example 1. The left gun body 3 has a cavity for arranging a first light path, and the right gun body 4 has a cavity for arranging a second light path. The trajectories of the first light path and the second light path are shown in FIG. Figure 4 Indicated by the dotted lines.

[0030] Specifically, such as Figure 4 As shown, the first light source 15 , the first collimating mirror 11 , the first reflecting mirror 12 , the second reflecting mirror 13 and the first focusing mirror 14 are disposed in the left gun body 3 .

[0031] Specifically, such as Figure 4 As shown, the second light source 25 , the second collimating mirror 21 , the third reflecting mirror 22 , the fourth reflecting mirror 23 and the second focusing mirror 24 are disposed in the right gun body 4 .

[0032] Specifically, such as Figures 3 to 5 As shown, the upper ends of the left gun body 3 and the right gun body 4 are connected, the lower ends of the left gun body 3 and the right gun body 4 are connected to the upper end of the barrel 5, and the focal points of the first focusing lens 14 and the second focusing lens 24 are located outside the lower end of the barrel 5.

[0033] The above solution cleverly combines two independent laser beams to achieve a dual-beam spot. Each independent laser beam is based on a proven laser system, resulting in high reliability and simplified maintenance. The ingenuity of this solution lies in the fact that both beams are integrated into the same laser welding gun structure, and each laser beam has the ability to independently adjust its beam trajectory and geometry. This helps achieve the ideal beam spot, resulting in stable, spatter-free laser welding, excellent weld formation, and the desired penetration depth and surface width.

[0034] Preferably, Figures 3 to 5 As shown, the upper ends of the left gun body 3 and the right gun body 4 are rotatably connected by a pin 31 for adjusting the angle between the first light path and the second light path. The left gun body 3 and the right gun body 4 are connected to the gun barrel 5 by screws 51.

[0035] Specifically, such as Figure 6 As shown, the lower end surfaces of the left gun body 3 and the right gun body 4 are outer arc structures, and the upper end surface of the gun barrel 5 is inner arc structure. The outer arc structure fits the outer arc structure, that is, no matter how large the angle between the left gun body 3 and the right gun body 4 is, the inner arc surface matches the outer arc surface.

[0036] Specifically, such as Figure 6As shown, a strip hole 52 is provided on the outside of the gun barrel 5. The opening direction of the strip hole 52 is consistent with the length direction of the gun barrel 5. The length direction of the strip hole 52 is consistent with the angle adjustment direction of the left gun body 3 and the right gun body 4. At least two screws 51 pass through the strip hole 52 from bottom to top and are locked on the lower ends of the left gun body 3 and the right gun body 4 respectively. Before adjusting the angle between the left gun body 3 and the right gun body 4, it is necessary to loosen the screws 51, and then swing the left gun body 3 or the right gun body 4 to achieve the purpose of adjusting the angle. After the angle is adjusted, the screws 51 can be tightened.

[0037] Preferably, Figure 4 、 Figure 6 As shown, protective lenses 1 are installed behind the first and second focusing lenses 14 and 24 of both the left and right gun bodies 3 and 4, respectively, to reduce direct or indirect damage to the gun optical path and laser caused by spatter and dust from the weld pool during welding. The first and second focusing lenses 14, 24, protective lenses 1, and the first and second collimating lenses 11 and 21 are all detachable mounting structures.

[0038] Preferably, Figures 3 to 5 As shown, a nozzle 53 is installed at the lower end of the barrel 5. This nozzle 53 is movable along the axis of the barrel 5 to adjust the distance between the gun muzzle and the focal spot. The shielding gas discharged from the nozzle 53 protects the weld pool at different power levels, preventing contamination of the weld area, ensuring weld quality, dispersing harmful gases and preventing the formation of pores, and assisting in cooling to remove heat from the nozzle and weld area, preventing nozzle damage and reducing the risk of workpiece deformation. The focal points of the first and second focusing lenses 14 and 24 are located outside the lower end of the nozzle 53.

[0039] Preferably, Figures 3 to 5 As shown, the first reflector 12, the second reflector 13, the third reflector 22 and the fourth reflector 23 are each provided with a separate drive motor 2, which is respectively mounted on the corresponding left gun body 3 and the right gun body 4. Specifically, the main axes of the drive motors 2 corresponding to the first reflector 12 and the second reflector 13 are perpendicular to each other, and the main axes of the drive motors 2 corresponding to the third reflector 22 and the fourth reflector 23 are perpendicular to each other.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to be the only one or to limit the present invention. It should be understood by those skilled in the art that various changes or equivalent replacements made to the present invention without departing from the scope of the present invention are within the scope of protection of the present invention.

Claims

1. A dual spot welding system, characterized in that: include: A first optical path and a second optical path; The first optical path is provided with a first light source (15), a first collimating mirror (11), a first reflecting mirror (12), a second reflecting mirror (13) and a first focusing mirror (14) in sequence, and the first reflecting mirror (12) and the second reflecting mirror (13) are swingably arranged, and the swing axes are perpendicular to each other; The second optical path is provided with a second light source (25), a second collimating mirror (21), a third reflecting mirror (22), a fourth reflecting mirror (23) and a second focusing mirror (24) in sequence, and the third reflecting mirror (22) and the fourth reflecting mirror (23) are swingably arranged, and the swing axes are perpendicular to each other; The first focusing mirror (14) and the second focusing mirror (24) have the same focal length.

2. A dual-spot welding system according to claim 1, characterized in that: The angle between the first light path and the second light path is adjustable.

3. A double spot welding gun, characterized in that: Comprising a left gun body (3), a right gun body (4), a gun barrel (5), and a dual-spot welding system according to any one of claims 1 to 2; A first light source (15), a first collimating mirror (11), a first reflecting mirror (12), a second reflecting mirror (13) and a first focusing mirror (14) are arranged in the left gun body (3); The second light source (25), the second collimating mirror (21), the third reflecting mirror (22), the fourth reflecting mirror (23) and the second focusing mirror (24) are arranged in the right gun body (4); The upper ends of the left gun body (3) and the right gun body (4) are connected, the lower ends of the left gun body (3) and the right gun body (4) are connected to the upper end of the gun barrel (5), and the focal points of the first focusing mirror (14) and the second focusing mirror (24) are located outside the lower end of the gun barrel (5).

4. A dual-spot welding gun according to claim 3, characterized in that: The upper ends of the left gun body (3) and the right gun body (4) are rotatably connected via a pin shaft (31) for adjusting the angle between the first light path and the second light path. The left gun body (3) and the right gun body (4) are connected to the gun barrel (5) via screws (51).

5. A dual-spot welding gun according to claim 4, characterized in that: The lower end surfaces of the left gun body (3) and the right gun body (4) are outer arc surface structures, the upper end surface of the gun barrel (5) is an inner arc surface structure, and the outer arc surface structures fit together.

6. A dual-spot welding gun according to claim 4, characterized in that: A strip hole (52) is provided on the outer side of the gun barrel (5), the opening direction of the strip hole (52) is consistent with the length direction of the gun barrel (5), and the length direction of the strip hole (52) is consistent with the angle adjustment direction of the left gun body (3) and the right gun body (4). At least two screws (51) pass through the strip hole (52) from bottom to top and are respectively locked at the lower ends of the left gun body (3) and the right gun body (4).

7. The dual-spot welding gun according to claim 3, characterized in that: The left gun body (3) and the right gun body (4) are both provided with protective lenses (1) behind the first focusing lens (14) and the second focusing lens (24) respectively.

8. The dual-spot welding gun according to claim 3, characterized in that: A nozzle (53) is provided at the lower end of the gun barrel (5), and the nozzle (53) is arranged to move along the axial direction of the gun barrel (5), and the focal points of the first focusing mirror (14) and the second focusing mirror (24) are located outside the lower end of the nozzle (53).

9. The dual-spot welding gun according to claim 3, characterized in that: The first reflector (12), the second reflector (13), the third reflector (22) and the fourth reflector (23) are each provided with a separate drive motor (2), and the drive motor (2) is respectively mounted on the corresponding left gun body (3) and right gun body (4).

Images