Handheld laser welding gun

Abstract

The utility model relates to the field of handheld laser welding, in particular to a handheld laser welding gun which comprises a handle and a gun body. A first mounting cavity used for mounting the collimated light output assembly and the focus lens is formed in the handle, the collimated light output assembly is used for conveying collimated light beams to the focus lens and converging the collimated light beams by the focus lens, and the main optical axis of the focus lens coincides with the central axis of the collimated light beams or intersects with the central axis of the collimated light beams at a preset angle; the gun body is internally provided with a transition cavity used for installing a reflecting mirror, the transition cavity is communicated with the first installing cavity, and light beams focused and transmitted by the self-focusing mirror are reflected to a to-be-machined part through the reflecting mirror, according to the handheld laser welding gun, the focusing mirror is arranged in the handle at the rear end of the welding gun, so that collimated light is converged before reaching the reflecting mirror; the weight of the gun body at the front end of the welding gun is reduced, welding personnel can conduct welding operation more conveniently and flexibly, and meanwhile the situation that metal chippings in the gun barrel fall off to damage a focus lens is avoided.

Description

Technical Field

[0001] This application relates to the field of handheld laser welding, and particularly to a handheld laser welding torch. Background Art

[0002] Laser welding utilizes the excellent directivity and high power density characteristics of a laser beam to focus the laser beam on a very small area through an optical system. In a very short time, a heat source area with highly concentrated energy is formed in the welded area, so that the welded area melts and rapidly solidifies to form a solder joint or a weld seam. Compared with other welding methods, laser welding has the advantages of concentrated energy, fast welding speed, and high processing accuracy. A handheld welding torch usually requires a welder to hold the device for operation. Inside a traditional handheld welding torch, a collimating mirror, a reflecting mirror, a focusing mirror, and a protective mirror are sequentially arranged along the optical path. The collimating mirror is usually located in the handle of the welding torch, the focusing mirror and the protective mirror are located in the gun barrel of the welding torch, and the reflecting mirror is used to receive the collimated beam output from the collimating mirror and reflect the collimated beam to the focusing mirror.

[0003] However, the applicant has found that there are some problems in the above-mentioned prior art that the focusing mirror of the laser welding torch is installed on the gun barrel part with more activities at the front end of the welding torch:

[0004] 1. The focusing lens and related support components are installed on the gun barrel, resulting in a heavier weight at the front end of the welding torch, which is likely to cause fatigue of the welder's hand and has a greater impact on the convenience and accuracy of operation;

[0005] 2. The focusing mirror is located at the gun barrel part with more activities. Although a protective mirror is provided, there is still a possibility of external contamination, and the falling of internal metal debris will also cause damage to the lens, affecting the welding effect.

[0006] Based on this, to solve the above problems, a new handheld laser welding torch needs to be designed. Utility Model Content

[0007] In view of the above-mentioned disadvantages of the prior art, the purpose of this application is to provide a laser processing optical path system and a handheld laser welding torch, which are used to solve the problems that the focusing mirror of the existing laser welding torch is located at the front end of the gun barrel, resulting in a heavier gun barrel weight and the focusing mirror being easily contaminated internally and externally.

[0008] To achieve the above purpose, the technical solution adopted in this application is:

[0009] A handheld laser welding torch, the handheld laser welding torch includes:

[0010] A handle, a first installation cavity for installing a collimated light output component and a focusing mirror is provided inside the handle. The collimated light output component is used to deliver a collimated beam to the focusing mirror and is converged by the focusing mirror. The main optical axis of the focusing mirror coincides with or intersects the central axis of the collimated beam at a predetermined angle;

[0011] The gun body is provided with a transition cavity for installing a reflector. The transition cavity is communicated with the first installation cavity. The light beam transmitted through the self-focusing lens is reflected by the reflector to the part to be processed.

[0012] As a preferred solution, the distance between the focusing lens and the collimated light output component is adjustable.

[0013] As a preferred solution, the collimated light output component includes a fiber optic cable, a quartz end cap, and a collimating mirror arranged in sequence. After the fiber optic cable is introduced from the outside of the laser welding gun, it is fused with the quartz end cap. The collimating mirror is optically connected to the quartz end cap. The focusing lens is configured to move a predetermined distance along the extension direction of the main optical axis of the collimating mirror.

[0014] As a preferred solution, the collimated light output component includes a fiber optic cable and a collimating end cap arranged in sequence. After the fiber optic cable is introduced from the outside of the laser welding gun, it is directly fused with the collimating end cap. The focusing lens is configured to move a predetermined distance along the extension direction of the main optical axis of the collimating end cap.

[0015] As a preferred solution, the reflector has a preset anti-damage threshold to receive the converging light beam emitted from the self-focusing lens.

[0016] As a preferred solution, an actuator is installed in the gun body. The actuator is movably connected to the reflector, and the actuator is used to drive the reflector to vibrate or swing.

[0017] As a preferred solution, the actuator is a micro motor, and the micro motor is connected to the reflector through a lens clip.

[0018] As a preferred solution, the laser welding gun further includes a heat dissipation block, and the heat dissipation block is thermally connected to the reflector.

[0019] As a preferred solution, the gun body includes a first part and a second part connected in sequence. The second part can be quickly disassembled and quickly locked relative to the first part.

[0020] As a preferred solution, a second installation cavity is further provided in the gun body. The second installation cavity is communicated with the transition cavity. A protective mirror optically connected to the reflector is provided in the second installation cavity. The protective mirror is configured as a drawer-type box structure.

[0021] Differing from the prior art, the embodiments of the present application provide a novel handheld laser welding torch. Using the laser welding torch of the present application will have at least the following beneficial effects: The welding torch of the present application has a compact structure and components, with a small overall volume, making it convenient for handheld operation; Since the focusing lens is arranged at the handle part of the welding torch, compared with the prior art solution of arranging the focusing lens in the gun body, it can not only effectively reduce the weight at the front end of the welding torch, making the welding operation more convenient and flexible for the welder, but also avoid the situation where metal debris inside the gun barrel falls and damages the focusing lens; In addition, the second part of the welding torch body can be quickly disassembled and locked relative to the first part, thus improving the disassembly and assembly efficiency of the welding torch during production or repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the figures do not constitute a proportional limitation.

[0023] Figure 1 It is a three-dimensional schematic diagram of the handheld laser welding torch of the present application;

[0024] Figure 2 It is a schematic diagram of the positions of the internal components of the handheld laser welding torch of the present application.

[0025] Description of the reference numerals in the drawings: 100, handle; 110, optical fiber; 120, quartz end cap; 130, collimating lens; 140, focusing lens; 150, first spacer; 160, second spacer;

[0026] 200, gun body; 201, first part; 202, second part; 210, protective lens; 220, rod body; 230, nozzle;

[0027] 310, reflector; 320, lens holder; 330, actuator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] For ease of understanding of this application, the following provides a more detailed description of this application 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 the other element, or there can be one or more intermediate elements therebetween. When an element is described as "electrically connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "upper", "lower", "inner", "outer", "bottom", etc. used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

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

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

[0031] Taking the drawings in the specification Figure 2 as the reference, define the up, down, left, and right orientation relationships of each component on the handheld laser welding gun of this application.

[0032] Please refer to Figure 1 , this application provides a handheld laser welding gun, which includes a handle 100 and a gun body 200. The handle 100 is internally provided with a first installation cavity for installing a collimated light output component and a focusing lens 140. The collimated light output component is used to deliver a collimated light beam to the focusing lens 140 and is converged by the focusing lens 140. The main optical axis of the focusing lens coincides with or intersects the central axis of the collimated light beam at a predetermined angle. The gun body is provided with a transition cavity for installing a reflecting mirror 310. The transition cavity is connected to the first installation cavity. The light beam transmitted through the focusing of the focusing lens 140 is reflected by the reflecting mirror 310 to the part to be processed, completing the processing of the workpiece.

[0033] When the central axis of the focusing lens intersects with the central axis of the collimated beam at a predetermined angle, after passing through the focusing lens arranged with a preset included angle offset relative to its central axis, the laser beam is shaped into an astigmatic beam. It should be noted that this astigmatic beam no longer forms a point image, but forms an asymmetric diffused light spot with a shrinking trend. By configuring a specific tilt angle for the focusing lens, the control of the energy distribution in the diffused light spot of the astigmatic beam can be achieved, and a light spot with different energy density distribution regions is formed at the focal plane of the focusing lens. It can be understood that the region with lower energy on the light spot is used to heat the base material and expand the keyhole opening, and the region with higher energy is used to penetrate the metal to achieve deep penetration welding. The two cooperate with each other to reduce the spatter generated at the welding part of the working area, so as to avoid the generation of pit defects and welding deformation.

[0034] Please continue to refer to Figure 1 , the first installation cavity is arranged along the extending direction of the handle 100, and the collimated light output component is fixedly installed at the rear end of the first installation cavity through fasteners such as bolts, and the focusing lens 140 is located downstream of the collimated light output component. In this application, by installing the focusing lens originally arranged in the gun body on the handle directly held by the welding operator, the weight of the front end of the welding gun is effectively reduced, making the welding operator more convenient and flexible during the welding operation and reducing the fatigue of long-term welding.

[0035] Preferably, the handle 100 and the gun body 200 are directly connected and arranged at a predetermined angle to form a gun-shaped structure convenient for the welding operator to hold by hand, so as to ensure that the welding operator maintains the best processing angle when holding the handle. Specifically, when using this laser welding gun, the welding operator holds the handle 100 by hand, aligns the output end of the gun body 200 with the workpiece to be processed, turns on the power supply of the welding gun, and can perform welding after determining various parameters.

[0036] In the embodiment of this application, the handle 100 and the gun body 200 are integrally formed. In other embodiments, the handle 100 and the gun body 200 can also be of a split design.

[0037] Compared with the prior art, in this application, by designing a handheld laser welding gun, when the welding gun is in use, the collimated light output by the collimated light output component is converged by the focusing lens before reaching the reflecting mirror, which not only helps to reduce the weight of the front end of the welding gun, making the welding operator more convenient and flexible during the welding operation, but also avoids the problems that the focusing lens is vulnerable to pollution and damage when located at the front end.

[0038] Now refer to Figure 1 and Figure 2 for a further detailed explanation of the handheld laser welding gun in this application.

[0039] In some embodiments, the distance between the focusing lens 140 and the collimated light output component is adjustable to adjust the position of the focal spot according to actual processing requirements.

[0040] Please refer to Figure 2 , the optical path system adopted by the handheld laser welding gun is sequentially provided with a collimated light output component, a focusing lens 140, and a reflecting mirror 310 along the beam transmission direction. Among them, the collimated light output component includes a fiber optic 110, a quartz end cap 120, and a collimating mirror 130 arranged in sequence. The fiber optic 110 is introduced from outside the laser welding gun and fused with the quartz end cap 120. The collimating mirror 130 is optically connected to the quartz end cap 120. The focusing lens 140 is configured to move a predetermined distance along the extension direction of the main optical axis of the collimating mirror 130 to adjust the position of the focal spot according to actual processing requirements.

[0041] In other embodiments, the collimated light output component may be a fiber optic and a collimating end cap arranged in sequence. The fiber optic is directly fused with the collimating end cap after being introduced from outside the laser welding gun. The focusing lens is configured to move a predetermined distance along the extension direction of the main optical axis of the collimating mirror to adjust the position of the focal spot according to actual processing requirements. When the collimated light output component adopts an integrated structure of the collimating end cap, it is beneficial to reduce the number of optical components in the optical path, thereby simplifying the installation and debugging process of the components, and is also beneficial to the lightweight design of the entire handheld laser welding gun.

[0042] Optionally, a focusing lens barrel (not shown in the figure) is movably installed in the first installation cavity, and the focusing lens 140 is installed in the focusing lens barrel. In order to enable the focusing lens 140 to move a predetermined distance along the extension direction of the main optical axis of the collimated beam, the welding gun further includes a focusing drive assembly (not shown in the figure). The focusing drive assembly is drivingly connected to the focusing lens barrel to drive the focusing lens barrel to move up and down in the first installation cavity, further driving the focusing lens to move to adjust the positive and negative values of the focus for cutting plates of different thicknesses. The focusing drive assembly preferably uses a motor. Compared with the manual drive focusing in the prior art, the self-driving focusing has higher accuracy and lower labor cost.

[0043] In the embodiments of the present application, the reflecting mirror 310 has a preset anti-damage threshold to receive the converging beam emitted from the focusing lens 140 and reflect it to a preset position.

[0044] Optionally, the reflecting surface of the reflecting mirror 310 is coated with a dielectric film for high-power lasers to effectively resist high-intensity laser beams and maintain its own performance without being damaged.

[0045] In one embodiment, the reflectivity of the reflecting mirror to the converging beam reaches 99.9%.

[0046] Please continue to refer to Figure 2, an actuator 330 is installed inside the handle of the laser welding torch of the present application. The actuator 330 is connected to the mirror 310 to drive the mirror 310 to swing or vibrate. Preferably, the actuator 330 is a micro motor, and the micro motor is connected to the mirror 310 through a lens clip 320.

[0047] It can be understood that in the embodiment of the present application, the collimated beam is focused by the focusing mirror 140 before reaching the mirror 310. Therefore, the beam energy received by the mirror 310 is relatively strong, and more heat is generated. Therefore, the laser welding torch further includes a heat dissipation block (not shown in the figure), and the heat dissipation block is thermally connected to the mirror 310 to timely dissipate the heat of the mirror 310 and prevent it from deforming due to heat, which affects the welding effect.

[0048] Preferably, as Figure 2 shown, the collimated beam output assembly 1A further includes a first spacer 150 and a second spacer 160. The first spacer 150 is installed between the quartz end cap 120 and the collimating mirror 130, and the quartz end cap 120 and the collimating mirror 130 respectively abut against two ends of the first spacer 150; the second spacer 160 is installed between the collimating mirror 130 and the focusing mirror 140, and the collimating mirror 130 and the focusing mirror 140 respectively abut against two ends of the second spacer 160.

[0049] It can be understood that in the technical solution of the present application, both the first spacer 150 and the second spacer 160 have stepped surfaces for fixing the lenses inside to enhance the fixing effect and improve the assembly stability of the lenses. Preferably, the contact surface between the second spacer 160 and the focusing mirror 140 is an arc surface, which can make the second spacer 160 have a larger contact area with the focusing mirror 140, contributing to the heat dissipation of the focusing mirror 140.

[0050] Please continue to refer to Figure 2 , the gun body 200 includes a first part 201 and a second part 202 connected in sequence. The first part 201 is disposed near the connection between the gun body 200 and the handle 100. The second part 202 includes a rod body and a nozzle connected to each other, and the second part 202 is connected to one end of the first part 201 through the connecting member. Optionally, the second part 202 is quickly disassembled and quickly locked relative to the first part 201 through the connecting member to improve the disassembly and assembly efficiency of the welding torch during production or repair.

[0051] Please continue to refer to Figure 2, the gun body 200 further has a second installation cavity which is communicated with the transition cavity, and a protective mirror 210 is provided in the second installation cavity. The reflecting mirror 310 is optically connected to the protective mirror 210. The protective mirror 210 is used to separate the external environment from the reflecting mirror 310, focusing mirror 140 and collimated light output component inside the welding gun, so as to protect the above-mentioned optical components. Specifically, it protects each lens inside the gun body from being polluted by dust, smoke, splashing, etc., and prevents the attenuation and scattering of the laser beam. The converging beam reflected by the reflecting mirror 310 passes through the protective mirror 210 and hits the workpiece to be processed for welding.

[0052] During the use of the welding gun, the protective mirror 210 needs to be cleaned or replaced regularly to ensure the quality and stability of the laser beam. Therefore, optionally, the protective mirror 210 is configured as a drawer-type box structure and is detachably installed inside the second installation cavity through elastic buckles or fasteners, so that it can be conveniently taken out when replacing the protective mirror.

[0053] In summary, compared with the prior art, the embodiment of the present application provides a new type of handheld laser welding gun. Using the laser welding gun of the present application will at least have the following beneficial effects: The welding gun of the present application has a compact structure and components, and the overall volume is small and convenient for handheld operation; Since the focusing mirror is arranged at the handle part of the welding gun, compared with the prior art solution of arranging the focusing mirror on the gun body, it can not only effectively reduce the weight of the front end of the welding gun, making the welding operation more convenient and flexible for the welding operator, but also avoid the situation that metal debris inside the gun barrel falls and damages the focusing mirror; In addition, the second part of the welding gun body can be quickly disassembled and locked relative to the first part, thus improving the disassembly and assembly efficiency of the welding gun during production or repair. Therefore, the present application effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0054] The above embodiments are only illustrative of the principles and effects of the present application, and are not used to limit the present application. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present application should still be covered by the claims of the present application.

Claims

1. A hand-held laser welding torch, characterized in that, The handheld laser welding torch comprises: a handle, wherein a first installation cavity for installing a collimated light output component and a focusing lens is arranged inside the handle, the collimated light output component is used for delivering a collimated light beam to the focusing lens and is converged by the focusing lens, and the principal optical axis of the focusing lens coincides with or intersects the central axis of the collimated light beam at a predetermined angle; a gun body, wherein a transition cavity for installing a reflecting mirror is arranged in the gun body, the transition cavity is communicated with the first installation cavity, and the light beam transmitted through focusing by the focusing lens is reflected by the reflecting mirror to a workpiece to be processed.

2. The hand-held laser welding torch according to claim 1, wherein, The distance between the focusing lens and the collimated light output component is adjustable.

3. The hand-held laser welding torch according to claim 2, wherein The collimated light output component comprises a fiber optic cable, a quartz end cap and a collimating mirror which are arranged in sequence, the fiber optic cable is introduced from outside the laser welding torch and then fused with the quartz end cap, the collimating mirror is optically connected with the quartz end cap, and the focusing lens is configured to be movable a predetermined distance along the extending direction of the principal optical axis of the collimating mirror.

4. The hand-held laser welding torch according to claim 2, wherein, The collimated light output component comprises a fiber optic cable and a collimating end cap which are arranged in sequence, the fiber optic cable is introduced from outside the laser welding torch and then directly fused with the collimating end cap, and the focusing lens is configured to be movable a predetermined distance along the extending direction of the principal optical axis of the collimating end cap.

5. The hand-held laser welding torch according to claim 1, wherein, The reflecting mirror has a preset anti-damage threshold value to receive the converged light beam emitted from the focusing lens.

6. The hand-held laser welding torch according to claim 1, wherein, An actuator is installed in the gun body, the actuator is movably connected with the reflecting mirror, and the actuator is used for driving the reflecting mirror to vibrate or swing.

7. The hand-held laser welding torch according to claim 6, wherein The actuator is a micro motor, and the micro motor is connected with the reflecting mirror through a lens holder.

8. The hand-held laser welding torch according to claim 1, characterized in that, The laser welding torch further comprises a heat dissipation block, and the heat dissipation block is thermally connected with the reflecting mirror.

9. The hand-held laser welding torch according to claim 1, wherein The gun body comprises a first part and a second part which are connected in sequence, and the second part can be quickly disassembled and locked relative to the first part.

10. The hand-held laser welding torch according to claim 1, characterized in that, A second installation cavity is further arranged in the gun body, the second installation cavity is communicated with the transition cavity, a protective mirror optically connected with the reflecting mirror is arranged in the second installation cavity, and the protective mirror is configured as a drawer-type box structure.

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