Light weight myriawatt laser welding head capable of adjusting annular light spots and laser welding system

Abstract

The utility model discloses a light weight myriawatt laser welding head and a laser welding system capable of adjusting annular light spots, which comprise a zooming component, and the zooming component receives collimated light beams output by an upstream light path and focuses the collimated light beams to a workpiece to be processed. The zoom assembly comprises a rotation driving device and a first lens, the rotation driving device is used for driving the first lens to rotate around a rotating shaft of the rotation driving device, a main optical axis of the first lens does not coincide with the rotating shaft, and the distance between the main optical axis of the first lens and the rotating shaft is adjustable. A galvanometer module is not adopted in a light path of the welding head, no optical medium face needs to be arranged, laser spots with the controllable swing track can be output through a simple structure, the welding quality is greatly improved, and the welding head can adapt to various complex welding processes; and meanwhile, laser energy loss and return light can be reduced, and the device is particularly suitable for a high-power laser processing system.

Description

Technical Field

[0001] The utility model relates to the field of laser processing, in particular to a lightweight 10,000-watt laser welding head with an adjustable annular spot and a laser welding system. Background Art

[0002] As a common method of laser welding, swing welding has a fast movement speed, a long movement trajectory, a short laser dwell time per unit length trajectory, and a more uniform energy distribution on the molten pool surface, so it has a better energy distribution uniformity effect.

[0003] Existing swing welding is usually achieved through a galvanometer scanning optical path output system, that is, an additional galvanometer module and a heat dissipation module and a temperature control module used in conjunction with the galvanometer module are introduced into the welding head to maintain high stability under low-power laser output. However, the above solution has the following problems:

[0004] 1. There are many optical lenses and other devices introduced, the design of the whole system is more complicated, the assembly difficulty is also higher, and the whole welding head is larger in size, which is not conducive to achieving the goal of miniaturization and lightweight;

[0005] 2. Under the condition of high-power laser output, the introduction of the galvanometer system will seriously affect the working efficiency of the welding head and the stability of the galvanometer system control.

[0006] Therefore, in order to solve the problems of complex optical path system, low working efficiency and system stability of the optical path system during high-power laser output in the prior art oscillating welding head, it is necessary to design a new lightweight 10,000-watt laser welding head and laser welding system with adjustable annular spot. Utility Model Content

[0007] In view of the shortcomings of the prior art mentioned above, the purpose of the utility model is to provide a lightweight 10,000-watt laser welding head and a laser welding system with an adjustable annular spot, which are used to solve the problems of the oscillating welding head in the prior art, such as complex optical path system, low working efficiency of the optical path system during high-power laser output and low system stability.

[0008] In order to achieve the above-mentioned purpose and other related purposes, a technical solution adopted by the utility model is:

[0009] A lightweight 10,000-watt laser welding head with an adjustable annular spot includes a zoom component, which receives a collimated light beam output from an upstream optical path and focuses the collimated light beam onto a workpiece to be processed. The zoom component includes a rotation drive device and a first lens. The rotation drive device is used to drive the first lens to rotate around the rotation axis of the rotation drive device. The main optical axis of the first lens does not coincide with the rotation axis, and the distance between the main optical axis of the first lens and the rotation axis is adjustable.

[0010] As a preferred solution, the main optical axis of the first lens is parallel to the rotation axis and is eccentrically arranged, and the relative spatial position of the central optical axis of the collimated light beam and the rotation axis is adjustable.

[0011] As a preferred solution, when the rotation speed of the first lens is greater than 20 r / s, the focal spot formed on the workpiece to be processed performs a rotational motion.

[0012] As a preferred solution, when the rotation speed of the first lens is greater than 1000 r / s, the collimated light beam leaves a ring-shaped track on the workpiece to be processed after being focused.

[0013] As a preferred solution, the distance between the main optical axis of the first lens and the rotation axis is less than 1 mm.

[0014] As a preferred solution, it also includes an imaging unit and a second lens. The return light reflected from the workpiece to be processed reaches the imaging unit after passing through the second lens. The imaging unit receives the return light to collect the weld shape and the focal image trajectory of the laser emitted from the welding head, so as to determine whether the welding head has completed focusing.

[0015] As a preferred solution, the rotation driving device has a hollow cavity, and the first lens is embedded in the hollow cavity.

[0016] As a preferred solution, the lightweight 10,000-watt laser welding head with an adjustable annular spot also includes a first control unit, which is electrically connected to the rotary drive device to control the rotation speed of the rotary drive device according to processing requirements to form a corresponding trajectory.

[0017] As a preferred solution, the collimated light beam of the upstream optical path is output from a laser output head, and the laser output head and the zoom component are housed in an integral sealed cavity.

[0018] The present application also proposes a laser welding system, which adopts any of the above-mentioned lightweight 10,000-watt laser welding heads with adjustable annular spot, and the main control device of the laser welding system controls the spot shape output by the welding head according to the input processing instructions.

[0019] The beneficial effects of the utility model are as follows: Different from the prior art, the present application discloses a lightweight 10,000-watt laser welding head with an adjustable annular spot and a laser welding system, which includes a zoom component. In the lightweight 10,000-watt laser welding head with an adjustable annular spot, the collimated laser beam is incident in a direction parallel to the optical axis of the first lens, and the first lens converges the collimated laser beam and forms a focal spot on the main optical axis of the first lens; since the main optical axis of the first lens does not coincide with the rotation axis of the rotation drive device, the first lens is driven by the rotation drive device to rotate around the rotation axis, and further the focal spot formed on the main optical axis also rotates synchronously around the rotation axis. When the rotation speed of the rotating shaft reaches a certain threshold speed, the rotation trajectory of the focal spot is annular.

[0020] In the lightweight 10,000-watt laser welding head with an adjustable annular spot of the utility model, a galvanometer module is not used in the laser beam output optical path, which reduces the use of optical lenses and other heat dissipation and temperature control related devices, thereby greatly reducing the size and weight of the device; there is no need to set up any optical medium surface, and a laser spot with a controllable swing trajectory can be output using a simple optical path structure, which greatly improves the welding quality and can adapt to various complex welding processes; at the same time, it also effectively reduces the loss and return light of the laser during the transmission process, and is particularly suitable for high-power laser processing systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0022] Figure 1 It is a structural schematic diagram of a lightweight 10,000-watt laser welding head with an adjustable annular spot in one embodiment of the utility model;

[0023] Figure 2 It is a schematic structural diagram of a lightweight 10,000-watt laser welding head with an adjustable annular spot in one embodiment of the utility model after the rotary drive device drives the first lens to rotate 180°;

[0024] Figure 3 It is a structural schematic diagram of a lightweight 10,000-watt laser welding head with an adjustable annular spot in another embodiment of the utility model;

[0025] Figure 4 This is a schematic structural diagram of the first lens rotating 180° driven by a rotary drive device in a lightweight 10,000-watt laser welding head with an adjustable annular spot in another embodiment of the utility model.

[0026] Figure 5 A schematic diagram of a ring-shaped light spot formed in an embodiment of the utility model;

[0027] Explanation of main component symbols: 1. third lens; 2. rotation drive device; 3. first lens; 2a, first fixing member; 2b, second fixing member; 4. imaging unit; 5. second lens; 6. laser output head; l1, main optical axis of the first lens; l2, rotation axis. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the utility model, the utility model is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element, or there can be one or more centered elements therebetween. When an element is described as "electrically connected" to another element, it can be directly connected to another element, or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "bottom" and the like used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0030] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] The utility model proposes a lightweight 10,000-watt laser welding head with adjustable annular spot, referring to Figure 1 The zoom assembly includes a zoom component, which receives the collimated light beam output from the upstream optical path and focuses the collimated light beam onto the workpiece to be processed. The zoom assembly includes a rotation drive device 2 and a first lens 3. The rotation drive device 2 is used to drive the first lens 3 to rotate around the rotation axis l2 of the rotation drive device 2. The main optical axis l1 of the first lens 3 does not coincide with the rotation axis l2, and the distance between the main optical axis l1 of the first lens 3 and the rotation axis l2 is adjustable.

[0032] In the above-mentioned lightweight 10,000-watt laser welding head with adjustable annular spot, the collimated laser beam is incident in a direction parallel to the optical axis of the first lens. The first lens converges the collimated laser beam and forms a focal spot on the main optical axis of the first lens. Since the main optical axis of the first lens is not coincident with the rotation axis of the rotation drive device, the first lens is driven by the rotation drive device to rotate around the rotation axis, further making the focal spot formed on the main optical axis also rotate synchronously around the rotation axis. When the rotation speed of the rotating shaft reaches a certain threshold speed, the rotation trajectory of the focal spot is annular, such as Figure 5 shown.

[0033] Therefore, the galvanometer module is not used in the laser beam output optical path, which reduces the use of optical lenses and other heat dissipation and temperature control related devices, thereby greatly reducing the size and weight of the device; there is no need to set up any optical medium surface, and a simple optical path structure can be used to output a laser spot with a controllable swing trajectory, which greatly improves the welding quality and can adapt to various complex welding processes; at the same time, it also effectively reduces the loss and return light of the laser during the transmission process, and is particularly suitable for high-power laser processing systems.

[0034] In one embodiment, the main optical axis l1 of the first lens 3 is parallel to and eccentrically disposed relative to the rotation axis l2, and the relative spatial position between the central optical axis of the collimated light beam and the rotation axis l2 is adjustable.

[0035] The adjustable relative spatial position means that the positional relationship between the central optical axis of the collimated light beam and the rotation axis l2 includes coincidence and parallel eccentricity.

[0036] It should be noted that when the rotation speed of the first lens 3 is greater than 20 r / s, the focal spot formed on the workpiece to be processed performs a rotational motion, and the rotating laser can stir the molten pool to improve the welding quality.

[0037] When the rotation speed of the first lens 3 is greater than 1000 r / s, the collimated light beam leaves a ring-shaped track on the workpiece to be processed after being focused, which is beneficial to the cutting of thick plates.

[0038] Preferably, in order to ensure the processing efficiency and quality of the zoom assembly, the distance between the main optical axis l1 of the first lens and the rotation axis l2 is less than 1 mm.

[0039] Please continue reading Figure 1 The lightweight 10,000-watt laser welding head with adjustable annular spot also includes an imaging unit 4 and a second lens 5.

[0040] In one embodiment, the collimated light beam output from the upstream optical path passes through the second lens 5 to reach the first lens 3, and is then focused by the first lens 3 on the workpiece to be processed; at the same time, the light reflected from the workpiece to be processed passes through the first lens 3 and the second lens 5 in sequence and reaches the imaging unit 4.

[0041] The imaging unit 4 receives light reflected from the workpiece to be processed, collects the weld shape and the focus image trajectory of the laser emitted from the welding head, so as to judge whether the device is focused in real time, which is beneficial to improving the processing accuracy of the welding head.

[0042] Please continue reading Figure 1The second lens 5 is tilted relative to the first lens 3, and its collimated light incident surface is coated with a film layer that supports the complete transmission of the collimated light beam, and its collimated light exit surface is coated with a film layer that supports the complete reflection of the reflected light. Therefore, through the special coating design, the collimated light emitted from the upstream of the zoom component can be completely transmitted and reach the first lens 3 located inside the rotary drive device 2 after reaching the second lens 5, and the light reflected from the workpiece to be processed can be completely reflected after passing through the second lens 5 and reach the imaging unit 4.

[0043] The imaging unit 4 receives the light reflected from the workpiece to be processed to collect the image trajectory of the laser focus emitted from the welding head and the weld shape, so as to judge whether the device is focused in real time and observe the complete weld at the same time to improve the processing accuracy of the welding head.

[0044] As an optional embodiment, the first lens 3 is disposed perpendicular to the horizontal plane, and the second lens 5 is disposed at an angle of 45° to the horizontal plane.

[0045] Furthermore, in the lightweight 10,000-watt laser welding head with adjustable annular spot of the utility model, the rotary drive device 2 has a hollow cavity, and the first lens 3 is embedded in the hollow cavity.

[0046] Since the first lens 3 is embedded in the hollow cavity of the rotation drive device 2, and the main optical axis l1 of the first lens is parallel to the rotation axis l2 of the rotation drive device 2 and is eccentrically arranged, when the rotation drive device 2 drives the first lens 3 to rotate around the rotation axis l2 of the rotation drive device 2, the focused light beam formed after the collimated light beam passes through the first lens 3 also rotates around the rotation axis l2, thereby realizing the change of the focused light spot position.

[0047] In one embodiment, the rotation driving device 2 may be a motor having a hollow cavity inside, wherein the cavity has a first fixing member 2a and a second fixing member 2b asymmetrically arranged about the rotation axis 12, and the first lens 3 is arranged in the hollow cavity of the rotation driving device 2 through the first fixing member 2a and the second fixing member 2b.

[0048] The asymmetric setting means that the displacement of the first fixing member 2a from the rotation axis l2 is not equal to the displacement of the second fixing member 2b from the rotation axis l2, and the main optical axis l1 of the first lens 3 installed in the hollow cavity through the first fixing member 2a and the second fixing member 2b is parallel to the rotation axis l2.

[0049] As one example, the first lens 3 is relatively fixed to the first fixing member 2a, the second fixing member 2b and the inner wall of the rotary drive device 2, that is, the first lens 3 is fixedly installed in the hollow cavity of the rotary drive device 2 through the first fixing member 2a and the second fixing member 2b; at this time, the eccentric distance between the main optical axis l1 of the first lens and the rotation axis l2 of the rotary drive device 3 is a predetermined value. It can be understood that when the rotation speed of the rotary drive device 2 is greater than 20r / s, the focal spot formed on the workpiece to be processed performs a circular motion, and the circular motion is generated around the rotation axis l2 of the rotary drive device 2; further, when the rotation speed of the rotary drive device 2 is greater than 1000r / s, the collimated light beam leaves a circular ring track on the workpiece to be processed after focusing.

[0050] In order to meet the requirements of different processing techniques, it is usually necessary to generate circular annular tracks with different inner diameters. Therefore, in the embodiment of the utility model, the eccentric distance between the main optical axis l1 of the first lens and the rotation axis l2 of the rotation drive device 2 is adjustable. That is, the eccentric distance between the first lens 3 and the rotation drive device 2 is set according to the processing requirements, and then the rotation drive device 2 is controlled to drive the first lens 3 to rotate at a certain speed, thereby forming a circular annular track with a desired inner diameter.

[0051] Optionally, the first fixing member 2a and the second fixing member 2b are movably mounted on the inner wall of the rotation drive device 2 through at least one driving member (not shown in the figure), and the first lens 3 is mounted in the hollow cavity of the rotation drive device through the first fixing member 2a and the second fixing member 2b. The driving member is used to adjust the relative position and distance between the main optical axis l1 of the first lens and the rotation axis l2 of the rotation drive device 2 to achieve the adjustment of the focal spot movement trajectory. The focal spot movement trajectory includes the inner diameter of the circular trajectory and the shape of the movement trajectory.

[0052] Optionally, the driving member may be an elastic member, and the first lens 3 changes the distance between its main optical axis l1 and the rotation axis l2 under the elastic force of the elastic member.

[0053] As another embodiment, while controlling the first lens 3 to rotate at a certain speed around the rotation axis l2, the first lens 3 is controlled to move in the vertical direction at a certain frequency through the driving member, and the light spot trajectory finally formed on the workpiece to be processed is a spiral annular trajectory. When the rotation speed of the rotary drive device 2 is greater than 20r / s, the focal spot formed on the workpiece to be processed moves in a spiral shape, and the spiral motion is generated around the rotation axis l2 of the rotary drive device 2; further, when the rotation speed of the rotary drive device 2 is greater than 1000r / s, the collimated light beam leaves a spiral annular trajectory on the workpiece to be processed after focusing, and the ring width of the spiral annular trajectory is equal to the diameter of the focal spot. In the field of welding, the above structure can achieve better welding effect and reduce spatter through reasonable parameter design (i.e., including the above rotation speed and frequency).

[0054] Optionally, the first fixing member 2a or the second fixing member 2b and the driving member are of an integrated design or a split design.

[0055] The lightweight 10,000-watt laser welding head with adjustable annular spot also includes a first control unit (not shown in the figure), which is connected to the main control device of the welding system to control the rotation speed of the first lens 3 according to the processing requirements to form a corresponding trajectory. When the first control unit controls the rotation speed of the rotary drive device 2 to be greater than 20r / s, the focal spot formed on the workpiece to be processed performs a circular motion, and the circular motion is generated around the rotation axis l2 of the rotary drive device 2; further, when the first control unit controls the rotation speed of the rotary drive device 2 to be greater than 1000r / s, the collimated light beam leaves a circular annular trajectory on the workpiece to be processed after focusing, and the ring width of the annular trajectory is equal to the diameter of the focal spot.

[0056] Optionally, the lightweight 10,000-watt laser welding head with adjustable annular spot further includes a second control unit (not shown in the figure), which is connected to the main control device of the welding system to control the driving member to adjust the relative position and distance between the main optical axis l1 of the first lens and the rotation axis l2 of the rotation driving device 2, so as to adjust the moving track of the focal spot. The moving track of the focal spot includes the inner diameter of the circular track and the shape of the moving track.

[0057] It can be understood that, while the first control unit controls the first lens 3 to rotate around the rotation axis l2 at a certain speed, the second control unit controls the driving member to drive the first lens 3 to move in the vertical direction at a certain frequency, and the light spot trajectory finally formed on the workpiece to be processed is a spiral annular trajectory. When the first control unit controls the rotation speed of the rotary drive device 2 to be greater than 20r / s, the focal spot formed on the workpiece to be processed moves in a spiral shape, and the spiral motion is generated around the rotation axis l2 of the rotary drive device 2; further, when the first control unit controls the rotation speed of the rotary drive device 2 to be greater than 1000r / s, the collimated light beam leaves a spiral annular trajectory on the workpiece to be processed after focusing, and the ring width of the spiral annular trajectory is equal to the diameter of the focal spot. In the field of welding, the above structure can achieve better welding effect and reduce spatter through reasonable parameter design (i.e., including the above rotation speed and frequency).

[0058] Furthermore, the collimated light beam of the upstream optical path is output from a laser output head, and the laser output head and the zoom assembly are accommodated in an integral sealed cavity.

[0059] Optionally, the lightweight 10,000-watt laser welding head with adjustable annular spot also includes a laser output head 6 and a third lens 1 located upstream of the laser zoom assembly. The laser output head 6 is used to output a divergent light beam to the third lens 1. The third lens 1 is a collimating lens, which is used to collimate the divergent light beam and transmit it into the second lens 5.

[0060] Please refer to Figure 1 , Figure 2 When the central optical axis of the collimated light beam coincides with the rotation axis l2, that is, when the main optical axis of the third lens 1 coincides with the rotation axis l2, the distance between the third lens 1 and the rotation driving device 2 is adjustable.

[0061] In the above embodiment, the change of the distance can be achieved by:

[0062] (1) controlling the third lens 1 to move a predetermined distance along its principal optical axis in a direction close to or away from the rotation driving device 2;

[0063] (2) controlling the rotation driving device 2 to move a predetermined distance along its rotation axis l2 in a direction close to or away from the third lens 1;

[0064] (3) The third lens 1 and the rotation driving device 2 are controlled to move simultaneously, wherein the third lens 1 moves a first predetermined distance along the extension direction of its main optical axis, and the rotation driving device moves a second predetermined distance along the extension direction of its rotation axis l2.

[0065] Please refer to Figure 3 , Figure 4When the central optical axis of the collimated light beam is parallel to and eccentric to the rotation axis l2, that is, the principal optical axis of the third lens 1 is parallel to and does not coincide with the rotation axis l2, a first spacing between the third lens 1 and the rotation drive device 2 along the direction in which the optical axis extends is adjustable; and / or a second spacing between the third lens 1 and the rotation drive device 2 along a direction perpendicular to the principal optical axis / rotation axis is adjustable.

[0066] In the above embodiments, it is sufficient to ensure that all the collimated light beams output from the third lens 1 enter the first lens 3 inside the rotation drive device 2 and form a focused light beam, and the present invention does not make any limitation thereto.

[0067] As an optional embodiment, the imaging unit 4 is electrically connected to a host computer (not shown in the figure). After the imaging unit 4 collects the weld shape and the image trajectory of the laser focus emitted from the welding head, it converts it into an electrical signal and sends it to the host computer in real time. The host computer performs image fitting on the spot image obtained by the imaging unit 4, determines in real time whether the device is focused, and observes the complete weld at the same time, thereby improving the processing accuracy of the welding head.

[0068] Optionally, in an embodiment of the present utility model, the focal length range of the first lens 3 is between 300 mm and 600 mm, and the focal length range of the third lens is between 80 mm and 150 mm.

[0069] As another aspect of the present application, the utility model also proposes a laser welding system, which adopts a lightweight 10,000-watt laser welding head with an adjustable annular spot in any of the above embodiments, and the main control device of the laser welding system controls the spot shape output by the welding head according to the input processing instructions.

[0070] Optionally, the laser welding system further includes an air curtain device (not shown in the figure), which is installed at the beam output end of the zoom assembly and is fixedly connected to the zoom assembly to form an air curtain to fix the workpiece to be processed on the workbench, ensuring that the workpiece to be processed will not shift during the processing, further improving the processing accuracy. The air curtain also blows away the smoke and waste generated during the processing from the processing area, greatly improving the cleanliness of the laser equipment during the processing.

[0071] In summary, the utility model discloses a lightweight 10,000-watt laser welding head and laser welding system with an adjustable annular spot, which includes a zoom component. In the lightweight 10,000-watt laser welding head with an adjustable annular spot, the collimated laser beam is incident in a direction parallel to the optical axis of the first lens, and the first lens converges the collimated laser beam and forms a focal spot on the main optical axis of the first lens; since the main optical axis of the first lens and the rotating axis of the rotating drive device are not arranged to coincide, the first lens is driven by the rotating drive device to rotate around the rotating axis, and further the focal spot formed on the main optical axis also rotates synchronously around the rotating axis. When the rotation speed of the rotating axis reaches a certain threshold speed, the rotation trajectory of the focal spot is annular.

[0072] In the lightweight 10,000-watt laser welding head with an adjustable annular spot of the utility model, a galvanometer module is not used in the laser beam output optical path, which reduces the use of optical lenses and other heat dissipation and temperature control related devices, thereby greatly reducing the size and weight of the device; there is no need to set up any optical medium surface, and a laser spot with a controllable swing trajectory can be output using a simple optical path structure, which greatly improves the welding quality and can adapt to various complex welding processes; at the same time, it also effectively reduces the loss and return light of the laser during the transmission process, and is particularly suitable for high-power laser processing systems.

[0073] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. Lightweight 10,000-watt laser welding head with adjustable annular spot, characterized by: The invention comprises a zoom assembly, which receives a collimated light beam outputted from an upstream optical path and focuses the collimated light beam onto a workpiece to be processed. The zoom assembly comprises a rotation drive device and a first lens. The rotation drive device is used to drive the first lens to rotate around a rotation axis of the rotation drive device. The main optical axis of the first lens does not coincide with the rotation axis, and the distance between the main optical axis of the first lens and the rotation axis is adjustable.

2. The lightweight 10,000-watt laser welding head with adjustable annular spot according to claim 1 is characterized in that: The main optical axis of the first lens is parallel to the rotation axis and is eccentrically arranged, and the relative spatial position of the central optical axis of the collimated light beam and the rotation axis is adjustable.

3. The lightweight 10,000-watt laser welding head with adjustable annular spot according to claim 1 is characterized in that: When the rotation speed of the first lens is greater than 20 r / s, the focal spot formed on the workpiece to be processed performs a rotation motion.

4. The lightweight 10,000-watt laser welding head with adjustable annular spot according to claim 1, characterized in that: When the rotation speed of the first lens is greater than 1000 r / s, the collimated light beam leaves a ring-shaped track on the workpiece to be processed after being focused.

5. The lightweight 10,000-watt laser welding head with adjustable annular spot according to claim 1, characterized in that: The distance between the main optical axis of the first lens and the rotation axis is less than 1 mm.

6. The lightweight 10,000-watt laser welding head with adjustable annular spot according to claim 1, characterized in that: It also includes an imaging unit and a second lens. The return light reflected from the workpiece to be processed reaches the imaging unit after passing through the second lens. The imaging unit receives the return light to collect the weld shape and the focus image trajectory of the laser emitted from the welding head, so as to determine whether the welding head has completed focusing.

7. The lightweight 10,000-watt laser welding head with adjustable annular spot according to claim 1, characterized in that: The rotation driving device has a hollow cavity, and the first lens is embedded in the hollow cavity.

8. The lightweight 10,000-watt laser welding head with adjustable annular spot according to claim 1, characterized in that: The lightweight 10,000-watt laser welding head with adjustable annular spot also includes a first control unit, which is electrically connected to the rotary drive device to control the rotation speed of the rotary drive device according to processing requirements to form a corresponding trajectory.

9. The lightweight 10,000-watt laser welding head with adjustable annular spot according to claim 1, characterized in that: The collimated light beam of the upstream optical path is output from a laser output head, and the laser output head and the zoom component are accommodated in an integral sealed cavity.

10. A laser welding system, characterized in that: A lightweight 10,000-watt laser welding head with an adjustable annular spot as described in any one of claims 1 to 9 is used, and a main control device of the laser welding system controls the spot shape output by the welding head according to an input processing instruction.

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