Light path system for forming point ring light spots and laser processing device

Abstract

The invention relates to a light path system for forming point ring light spots and a laser processing device. The light path system comprises a first light source, a first collimating lens, a first conical lens and a reflecting mirror which are arranged in the first linear direction. The second light source, the second collimating lens, the focusing lens and the second conical lens are arranged in the second linear direction, the reflecting mirror is located between the second collimating lens and the focusing lens, and the center of the reflecting mirror and the center of the second conical lens are each provided with a through hole allowing a second light beam emitted by the second light source to penetrate through; a first light beam emitted by the first light source passes through the first collimating lens and the first conical lens and then is reflected by the reflector, and the reflected first light beam sequentially passes through the focus lens and the second conical lens and then forms an annular light spot at the focus of the focus lens. A second light beam emitted by the second light source sequentially passes through the second collimating lens and the focus lens and then forms a point light spot located in the center of the annular light spot at the focus of the focus lens. The composite light spot of the center point light spot and the outer ring light spot can be formed, the structure is simple, and the manufacturing cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of laser processing, and in particular to an optical path system for forming a point ring light spot and a laser processing device. Background Art

[0002] Laser welding, especially high-power welding, is prone to spatter. The particles generated by the spatter will also adhere to the molten pool and the workpiece surface, which can easily cause surface roughness changes and scratch the parent material. At the same time, it will pollute the clean environment inside the gun head and affect the service life of the optical lens. Therefore, controlling spatter has become a link that cannot be ignored in laser processing technology.

[0003] At present, the dot ring laser can solve the above problems very well. It is a laser that emits two laser beams at the same time, one for the center and the other for the outer ring, and forms a focused spot of the center spot and the outer ring spot through a complex optical path system. When welding, the center spot forms a molten pool while the outer ring laser quickly heats and melts the edge to avoid spatter. However, the current dot ring laser is expensive and difficult to promote on a large scale. Summary of the invention

[0004] Based on the above description, the present invention provides an optical path system and a laser processing device for forming a point ring light spot, so as to solve the problem that the current point ring laser is expensive and difficult to promote on a large scale.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: In a first aspect, the present application provides an optical path system for forming a point ring light spot, and the technical solution adopted is as follows: An optical path system for forming a point ring light spot, comprising: A first light source, a first collimating lens, a first aconic lens and a reflector are sequentially arranged in a first straight line direction; A second light source, a second collimating lens, a focusing lens and a second aconic lens are sequentially arranged in a spaced relationship along a second straight line direction, the reflecting mirror is located between the second collimating lens and the focusing lens, and the centers of the reflecting mirror and the second aconic lens are both provided with through holes for the second light beam emitted by the second light source to pass through; The first light beam emitted by the first light source passes through the first collimating lens and the first axicon in sequence and is reflected by the reflector, and the reflected first light beam passes through the focusing lens and the second axicon in sequence to form an annular light spot at the focus of the focusing lens; The second light beam emitted by the second light source passes through the second collimating lens and the focusing lens in sequence, and then forms a point light spot located at the center of the annular light spot at the focus of the focusing lens.

[0006] Preferably, a first collimating protective lens is provided between the first light source and the first collimating lens.

[0007] Preferably, a second collimating protective lens is provided between the second light source and the second collimating lens.

[0008] Preferably, the distance between the first axicon lens and the second axicon lens in the first light beam transmission direction is adjustable.

[0009] Preferably, the first direction is perpendicular to the second direction.

[0010] In a second aspect, the present application provides a laser processing device, comprising an optical path system for forming a point ring light spot as described above and a housing, wherein the optical path system for forming a point ring light spot is disposed in the housing.

[0011] Preferably, the first conical lens can move relative to the housing along a first straight line direction, and an adjustment component for driving the first conical lens to move is provided between the housing and the first conical lens.

[0012] Preferably, the adjustment component comprises: A driving gear, the axis of which is parallel to the first straight line direction and rotatably connected to the housing; A driving screw, the axis of which is parallel to the first straight line and rotatably connected to the housing; A driven gear coaxially fixed to the driving screw and meshing with the driving gear; A driving block is fixed to the first axicon and is threadedly connected to the driving screw.

[0013] Preferably, the driving gear is connected to a knob, which is suitable for driving the driving gear to rotate by rotating the knob.

[0014] Compared with the prior art, the technical solution of the present application has at least the following beneficial technical effects: 1. The present application forms a first optical path component through a first light source, a first collimating lens, a first cone lens, a reflector, a focusing lens, and a second cone lens, and forms a second optical path component through a second light source, a second collimating lens, and a focusing lens, and sets a through hole in the center of the reflector and the second cone lens for the second light beam of the second light source to pass through. The first light beam and the second light beam are combined after passing through the reflector. The first light beam forms a parallel light beam after passing through the first collimating lens, and then forms a divergent annular light beam after passing through the first cone lens. After the annular light beam passes through the reflector, it is converged and focused by the focusing lens, and converged and formed by the second cone lens, thereby forming an annular light spot at the focus of the focusing lens, and the parallel light beam formed by the second light beam after passing through the second collimating lens only needs to be focused by the focusing lens to form a point light spot at the focus, and is combined with the annular light plate to form a composite light spot of the center point light spot and the outer ring light spot. The entire optical path system has a simple structure, and two lasers are used to form a composite light spot of the center point light spot and the outer ring light spot. The manufacturing and processing cost is low, and it is suitable for large-scale promotion.

[0015] 2. The laser processing device of the present application arranges the optical path system for forming a point ring light spot in a shell and assembles it into a laser processing head, thereby reducing the manufacturing cost of the laser processing head, and drives the first conical lens to move relative to the shell through an adjustment component to adjust the distance between the first conical lens and the second conical lens in the transmission direction of the first light beam, thereby achieving adjustment of the size of the annular light spot. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a laser processing device provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of an optical path system for forming a point ring light spot in a laser processing device provided in an embodiment of the present invention; Figure 3 A schematic diagram of the structure of an adjustment component in a laser processing device provided in an embodiment of the present invention.

[0017] Description of reference numerals: 1. Housing; 11. QBH connector; 12. Adjustment cover; 2. First light source; 3. First collimating lens; 4. First cone lens; 5. Reflector; 6. Second light source; 7. Second collimating lens; 8. Focusing lens; 9. Second cone lens; 10. First collimating protective lens; 20. Second collimating protective lens; 30. Focusing protective lens; 40. Adjustment assembly; 401. Driving gear; 402. Driving screw; 403. Driven gear; 404. Driving block; 405. Knob. DETAILED DESCRIPTION

[0018] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0020] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0021] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0022] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0023] Reference Figure 1-3 As shown, an embodiment of the present application provides a laser processing device, which includes a housing 1 and an optical path system for forming a point ring light spot arranged in the housing 1.

[0024] Reference Figure 2As shown, the optical path system for forming the dot ring light spot includes a first light source 2, a first collimating lens 3, a first cone lens 4, a reflector 5, a second light source 6, a second collimating lens 7, a focusing lens 8 and a second cone lens 9. The first light source 2, the first collimating lens 3, the first cone lens 4 and the reflector 5 are sequentially arranged at intervals along the first straight line direction, and the second light source 6, the second collimating lens 7, the reflector, the focusing lens 8 and the second cone lens 9 are sequentially arranged at intervals along the second straight line direction. The centers of the reflector 5 and the second cone lens 9 are both provided with through holes for the second light beam emitted by the second light source 6 to pass through.

[0025] Reference Figure 2 As shown, the first light beam emitted by the first light source 2 passes through the first collimating lens 3 and the first conical lens 4 in sequence and is reflected by the reflector 5. The reflected first light beam passes through the focusing lens 8 and the second conical lens 9 in sequence and forms an annular light spot at the focus of the focusing lens 8. The second light beam emitted by the second light source 6 passes through the second collimating lens 7 and the focusing lens 8 in sequence and forms a point light spot located at the center of the annular light spot at the focus of the focusing lens 8.

[0026] Reference Figure 2 As shown, specifically, the divergent first light beam emitted by the first light source 2 is collimated by the first collimating lens 3 to form a parallel light beam or a nearly parallel light beam with a certain divergence angle. The parallel light beam then passes through the first aconic lens 4 to form a divergent annular light beam. The annular light beam is reflected by the reflector 5 and then converged and focused by the focusing lens 8. After being converged and formed by the second aconic lens 9, an annular light spot is formed at the focus of the focusing lens 8. The second light beam emitted by the second light source 6 passes through the second collimating lens 7 to form a parallel light beam or a nearly parallel light beam with a certain divergence angle. The parallel light beam passes through the central through hole of the reflector 5 and then is focused by the focusing lens 8. The focused second light beam passes through the central through hole of the second aconic lens 9 and then forms a point light spot located at the center of the annular light spot at the focus of the focusing lens 8. The first light beam and the second light beam are combined at the reflector 5, and a composite light spot of a central point light spot and an outer ring light spot is formed at the focus of the focusing lens 8, that is, a composite light spot is formed by an optical path system composed of two light sources and optical lenses, which has the advantages of simple structure and low cost, and is suitable for large-scale promotion.

[0027] Reference Figure 2 As shown, further, a first collimating protection mirror 10 is provided between the first light source 2 and the first collimating lens 3, a second collimating protection mirror 20 is provided between the second light source 6 and the second collimating lens 7, and a focusing protection mirror 30 is provided between the second conical lens 9 and the focus of the focusing lens 8.

[0028] The first straight line direction is perpendicular to the second straight line direction, and the reflector 5 is a 45° reflector 5. In this embodiment, a water-cooled copper reflector 5 is used, and a through hole is provided in the center thereof for the second light beam to pass through. The first collimating lens 3 and the second collimating lens 7 can be collimated with the same focal length or with different focal lengths.

[0029] Furthermore, in order to adjust the size of the annular light spot, the distance between the first axicon 4 and the second axicon 9 in the transmission direction of the first light beam is adjustable.

[0030] Reference Figure 1-2 As shown, specifically, except for the first conical lens 4, the first light source 2 and the second light source 6, other optical lenses are fixed on the housing 1, and the housing 1 is provided with a QBH connector 11 for connecting the first light source 2 and the second light source 6 respectively, and the first conical lens 4 is configured to be movable relative to the housing 1 along a first straight line direction, and an adjustment component 40 for driving the first conical lens 4 to move is provided between the housing 1 and the first conical lens 4.

[0031] Reference Figure 1 and Figure 3 As shown, the adjustment component 40 includes a driving gear 401, a driving screw 402, a driven gear 403 and a driving block 404, the axis of the driving gear 401 is parallel to the first straight line direction and is rotatably connected to the housing 1, the axis of the driving screw 402 is parallel to the first straight line and is rotatably connected to the housing 1, the driven gear 403 is coaxially fixed with the driving screw 402 and meshed with the driving gear 401, and the driving block 404 is fixed to the first conical lens 4 and is threadedly connected to the driving screw 402.

[0032] Reference Figure 1 and Figure 3 As shown, specifically, an adjustment cover 12 is provided on the outer wall of the housing 1 in the area where the first conical lens 4 is located, and the driving gear 401, the driving screw 402, the driven gear 403 and the driving block 404 are all located in the adjustment cover 12, the driving block 404 is fixed to the frame of the first conical lens 4, and an adjustment slot extending along the first straight line direction is provided on the housing 1, and the driving block 404 extends to the outside of the housing 1 through the adjustment slot. The two ends of the driving screw 402 are connected to the housing 1 through two ear plates, the ear plates are fixed to the housing 1, the driving screw 402 is rotatably connected to the ear plates, the driven gear 403 is coaxially fixed to the driving screw 402, the driving gear 401 is connected to one ear plate through a rotating shaft, and the driving gear 401 is meshed with the driven gear 403. To facilitate the rotation of the driving gear 401 , the driving gear 401 is connected to a knob 405 , which is disposed outside the adjustment cover 12 , and one end of the shaft passes through the adjustment cover 12 and is fixed to the knob 405 , so that the driving gear 401 can be driven to rotate by rotating the knob 405 .

[0033] Reference Figure 3As shown, further, the driving gear 401 is set to have a diameter smaller than that of the driven gear 403, so that the rotation angle of the driven gear 403 is smaller than the rotation angle of the driving gear 401, that is, the power of the rotation of the driving gear 401 is decelerated and transmitted to the driving screw 402, so as to slowly drive the driving block 404 to move, that is, slowly adjust the position of the first conical lens 4, and then slowly adjust the size of the annular light plate to meet the requirements.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical path system for forming a spot ring light spot, characterized in that: include: A first light source (2), a first collimating lens (3), a first conical lens (4) and a reflector (5) are sequentially arranged at intervals along a first straight line direction; A second light source (6), a second collimating lens (7), a focusing lens (8) and a second aconic lens (9) are arranged in sequence and spaced apart along a second straight line direction, the reflecting mirror (5) is located between the second collimating lens (7) and the focusing lens (8), and the centers of the reflecting mirror (5) and the second aconic lens (9) are both provided with through holes for a second light beam emitted by the second light source (6) to pass through; A first light beam emitted by the first light source (2) passes through the first collimating lens (3) and the first aconic lens (4) in sequence and is reflected by the reflector (5); the reflected first light beam passes through the focusing lens (8) and the second aconic lens (9) in sequence and forms an annular light spot at the focus of the focusing lens (8); The second light beam emitted by the second light source (6) passes through the second collimating lens (7) and the focusing lens (8) in sequence, and forms a point light spot located at the center of the annular light spot at the focus of the focusing lens (8).

2. The optical path system for forming a spot ring light spot according to claim 1, characterized in that: The distance between the first conical lens (4) and the second conical lens (9) in the first light beam transmission direction is adjustable.

3. The optical path system for forming a spot ring light spot according to claim 1, characterized in that: A first collimating protective lens (10) is provided between the first light source (2) and the first collimating lens (3).

4. The optical path system for forming a spot ring light spot according to claim 1, characterized in that: A second collimating protective mirror (20) is provided between the second light source (6) and the second collimating lens (7).

5. The optical path system for forming a spot ring light spot according to claim 1, characterized in that: The first direction is perpendicular to the second direction.

6. A laser processing device, characterized in that: It comprises an optical path system for forming a point ring light spot as claimed in any one of claims 1 to 5 and a housing (1), wherein the optical path system for forming a point ring light spot is arranged in the housing (1).

7. The laser processing device according to claim 6, characterized in that: The first conical lens (4) can move relative to the housing (1) along a first straight line direction, and an adjustment component (40) for driving the first conical lens (4) to move is provided between the housing (1) and the first conical lens (4).

8. The laser processing device according to claim 7, characterized in that: The adjustment component (40) comprises: A driving gear (401), the axis of which is parallel to the first straight line direction and is rotatably connected to the housing (1); A driving screw (402), the axis of which is parallel to the first straight line and is rotatably connected to the housing (1); A driven gear (403) coaxially fixed to the driving screw (402) and meshing with the driving gear (401); A driving block (404) is fixed to the first conical lens (4) and is threadedly connected to the driving screw (402).

9. The laser processing device according to claim 8, characterized in that: The driving gear (401) is connected to a knob (405), which is suitable for driving the driving gear (401) to rotate by rotating the knob (405).

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