Laser welding equipment and laser welding system thereof

Abstract

The utility model provides laser welding equipment and a laser welding system thereof. The laser welding equipment comprises a collimation focusing assembly and an in-welding detection assembly. The input end of the collimating and focusing assembly is used for being connected with external laser generating equipment, and the collimating and focusing assembly is arranged between the in-welding detection assembly and a welding workpiece and connected with the in-welding detection assembly; the collimating and focusing assembly is used for receiving incident laser emitted by external laser generating equipment, focusing the incident laser on a welding workpiece and transmitting a retroreflection signal generated by the welding workpiece to the in-welding detection assembly; the in-welding detection assembly is used for receiving a retroreflection signal transmitted by the collimating and focusing assembly; wherein the retroreflection signal is used for detecting the welding quality, so that the designed laser welding equipment and the laser welding system thereof can detect the defects in the welding process, and the welding quality and safety of the welding workpiece are improved.

Description

Technical Field

[0001] This application relates to the field of laser welding technology, and more specifically, to a laser welding device and a laser welding system thereof. Background Technology

[0002] With the booming development of the new energy vehicle industry, the motor, as the core of power conversion in new energy vehicles, has its performance optimization and cost control directly affecting the energy efficiency, driving range and market competitiveness of the entire vehicle.

[0003] New energy motors (such as flat wire motors, induction motors, and hybrid excitation motors) are an essential power component for new energy vehicles, and welding is one of the most critical and challenging aspects of motor manufacturing. Welding of new energy motors places extremely high demands on cycle time, weld quality, and stability.

[0004] Traditional laser welding equipment suffers from unstable penetration due to high temperatures during the laser welding process, which can easily lead to defects such as incomplete welds, thus posing quality and safety risks to new energy motors. Utility Model Content

[0005] The purpose of this application is to provide a laser welding equipment and a laser welding system to solve the problem that the current laser welding equipment has unstable penetration due to high temperature during the laser welding process, which easily leads to defects such as incomplete welding, resulting in quality and safety hazards in new energy motors.

[0006] In a first aspect, this utility model provides a laser welding device, comprising: a collimating and focusing component and a welding detection component; the input end of the collimating and focusing component is used to connect to an external laser generating device, the collimating and focusing component is disposed between the welding detection component and the welding workpiece, and the collimating and focusing component is connected to the welding detection component; the collimating and focusing component is used to receive the incident laser emitted by the external laser generating device, focus the incident laser onto the welding workpiece, and transmit the echo signal generated by the welding workpiece to the welding detection component; the welding detection component is used to receive the echo signal transmitted by the collimating and focusing component; wherein, the echo signal is used to detect the welding quality.

[0007] The laser welding equipment designed above uses a collimating and focusing component to focus the incident laser from an external laser emitting device onto the workpiece for welding. The reflected signal generated by the workpiece is then returned to the welding detection component, which can detect the welding quality based on the received reflected signal. This allows the designed laser welding equipment and system to detect defects in the welding process, thereby improving the quality and safety of welding workpieces (such as new energy motors).

[0008] In an optional embodiment of the first aspect, the collimating and focusing assembly includes a collimating lens group, an adjustable reflective lens group, and a focusing lens group; the collimating lens group is disposed between the external laser generating device and the reflective lens group, and is configured to transmit the incident laser to the reflective lens group; the adjustable reflective lens group is disposed between the collimating lens group and the focusing lens group, and is configured to transmit the incident laser to the focusing lens group and adjust the position of the incident laser transmitted to the focusing lens group; the focusing lens group is disposed between the adjustable reflective lens group and the welding workpiece, and is configured to focus the incident laser transmitted by the adjustable reflective lens group onto the welding workpiece.

[0009] In an optional embodiment of the first aspect, the collimating lens assembly includes an optical fiber interface, a protective mirror, a collimating mirror, and a first beam combiner; the optical fiber interface is used to connect to an external laser generating device; the protective mirror is located between the optical fiber interface and the collimating mirror along the optical axis of the incident laser, the collimating mirror is located between the protective mirror and the first beam combiner along the optical axis of the incident laser, and the first beam combiner is located between the collimating mirror and the adjustable reflective lens assembly.

[0010] In an optional embodiment of the first aspect, the adjustable reflective lens group includes a first driving member, a second driving member, a first reflector, and a second reflector; the first reflector is disposed on the first driving member, and the second reflector is disposed on the second driving member to adjust the positions of the first reflector and the second reflector; the first reflector is disposed between the collimating lens group and the second reflector along the optical axis of the incident laser transmitted by the collimating lens group, and the second reflector is disposed between the first reflector and the focusing lens group along the optical axis of the incident laser reflected by the first reflector.

[0011] In the above-described implementation, this solution uses two driving components to move two reflectors. This allows for the transmission of incident laser reflection, and also enables the adjustment of the reflector positions to control the position of the incident laser transmitted to the focusing lens group. This allows for adjustment of the focused spot position, enabling precise welding of each welding area with individual calibration, one-time forming, elimination of errors caused by lens edge imaging distortion, and significant improvement in equipment stability and production efficiency.

[0012] In an optional embodiment of the first aspect, the welding detection component includes a welding detection sensor and a second beam combiner; the second beam combiner is disposed between the welding detection sensor and the collimating and focusing component; the second beam combiner is used to receive the retroreflected signal transmitted by the collimating and focusing component and reflect the retroreflected signal to the welding detection sensor; wherein the retroreflected signal is used to detect the welding quality.

[0013] In the above implementation, this solution uses a second beam combiner to reflect only a portion of the optical radiation signal, thereby filtering out the optical radiation signal that is not needed for welding quality detection in the reflected signal, and thus improving the accuracy of welding quality detection.

[0014] In an alternative embodiment of the first aspect, the laser welding apparatus further includes a camera and a camera lens assembly; the camera lens assembly is disposed between the welding detection component and the camera, and is configured to transmit the echo signal transmitted by the welding detection component to the camera.

[0015] In an alternative embodiment of the first aspect, the camera lens group includes a filter and a third reflecting mirror; the filter is disposed between the welding detection component and the third reflecting mirror, and the third reflecting mirror is disposed between the filter and the camera lens.

[0016] In the above implementation method, this solution uses a camera and camera lens group to capture and detect the laser welding position, thereby improving the accuracy of the laser welding position.

[0017] In an alternative embodiment of the first aspect, the laser welding equipment further includes a light source; the light source is disposed between the collimating and focusing assembly and the workpiece to be welded.

[0018] In the above implementation, a light source is placed between the collimating and focusing assembly and the welding workpiece, thereby providing a suitable lighting environment for the welding workpiece, which improves the contrast, clarity and accuracy of the images captured by the camera, and helps the camera to more accurately identify, detect and analyze information such as the weld position.

[0019] In an alternative embodiment of the first aspect, the laser welding equipment further includes an air knife assembly; the air knife assembly is disposed between the collimating and focusing assembly and the workpiece to be welded, and is configured to clean dust and exhaust gas from the collimating and focusing assembly and the workpiece to be welded.

[0020] In the above-described embodiment, this solution sets up an air knife assembly between the collimating and focusing assembly and the welding workpiece to clean the dust and exhaust gas from the collimating and focusing assembly and the welding workpiece, thereby protecting the optical components and improving the welding accuracy.

[0021] In a second aspect, the present invention provides a laser welding system, which includes an external laser generating device and the laser welding device described in any optional embodiment of the first aspect.

[0022] The laser welding system designed above includes the laser welding equipment of any optional embodiment in the first aspect. Therefore, the designed laser welding system can focus the incident laser from the external laser emitting device onto the workpiece to perform welding by collimating and focusing components, and return the echo signal generated by the workpiece to the welding detection component. This allows the welding detection component to detect the welding quality based on the received echo signal. In this way, the designed laser welding equipment and laser welding system can detect defects in the welding process, thereby improving the welding quality and safety of the workpiece (such as a new energy motor). Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a first structural schematic diagram of the laser welding equipment provided in an embodiment of this application;

[0025] Figure 2 This is a second structural schematic diagram of the laser welding equipment provided in the embodiments of this application;

[0026] Figure 3 This is a schematic diagram of the third structure of the laser welding equipment provided in the embodiments of this application;

[0027] Figure 4 This is a schematic diagram of the fourth structure of the laser welding equipment provided in the embodiments of this application;

[0028] Figure 5 This is a fifth structural schematic diagram of the laser welding equipment provided in the embodiments of this application;

[0029] Figure 6 This is a sixth structural schematic diagram of the laser welding equipment provided in the embodiments of this application;

[0030] Figure 7 This is a schematic diagram of the structure of the laser welding system provided in the embodiments of this application.

[0031] Icons: A - External laser generator; B - Welding workpiece; 1 - Laser welding equipment; 10 - Collimation and focusing assembly; 110 - Collimation lens group; 1110 - Fiber optic interface; 1120 - Protective lens; 1130 - Collimation lens; 1140 - First beam combiner; 120 - Adjustable reflective lens group; 1210 - First driving component; 1220 - Second driving component; 1230 - First reflecting mirror; 1240 - Second reflecting mirror; 130 - Focusing lens group; 20 - In-process detection assembly; 210 - In-process detection sensor; 220 - Second beam combiner; 30 - Camera; 40 - Camera lens group; 410 - Filter; 420 - Third reflecting mirror; 50 - Light source; 60 - Air knife assembly. Detailed Implementation

[0032] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0035] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0037] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0038] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0039] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0040] With the booming development of the new energy vehicle industry, the motor, as the core of power conversion in new energy vehicles, has its performance optimization and cost control directly affecting the energy efficiency, driving range and market competitiveness of the entire vehicle.

[0041] New energy motors (such as flat wire motors, induction motors, and hybrid excitation motors) are an essential power component for new energy vehicles, and welding is one of the most critical and challenging aspects of motor manufacturing. Welding of new energy motors places extremely high demands on cycle time, weld quality, and stability.

[0042] Traditional laser welding equipment suffers from unstable penetration due to high temperatures during the laser welding process, which can easily lead to defects such as incomplete welds, thus posing quality and safety risks to new energy motors.

[0043] To address the aforementioned issues, this application designs a laser welding equipment and system. A collimating and focusing assembly focuses the incident laser from an external laser emitting device onto the workpiece for welding. The reflected signal generated by the welded workpiece is then fed back to a welding detection assembly, allowing the assembly to inspect the welding quality based on the received signal. This enables the designed laser welding equipment and system to detect defects during the welding process, thereby improving the quality and safety of welding workpieces (such as new energy motors). Furthermore, this solution includes a camera recognition unit to acquire weld seam position information, and an adjustable reflector group allows for weld point position adjustment. This enables precise welding of each welding area through individual calibration, achieving one-time forming and eliminating errors caused by lens edge imaging distortion, significantly improving equipment stability and production efficiency.

[0044] Based on the above ideas, this application first provides a laser welding device, such as... Figure 1As shown, the laser welding equipment includes a collimation and focusing component 10 and a welding detection component 20. The input end of the collimation and focusing component 10 is used to connect to an external laser generating device A. The collimation and focusing component 10 is disposed between the welding detection component 20 and the workpiece B to be welded, and the collimation and focusing component 10 is connected to the welding detection component 20. The workpiece B to be welded can be any type of new energy motor; for example, the workpiece B can specifically be a flat wire motor, an induction motor, or a hybrid excitation motor.

[0045] In the laser welding equipment designed above, the external laser generator A is used to generate an incident laser and transmit the generated incident laser to the collimation and focusing component 10. The collimation and focusing component 10 receives the incident laser emitted by the external laser generator A and collimates and focuses the incident laser onto the workpiece B, thereby performing welding processing on the workpiece B.

[0046] During the laser welding process of workpiece B, ion light signals (metal vapor signals), laser reflection signals, and molten pool thermal radiation signals are generated. These radiated light signals can reflect the welding status and whether defects are generated during the welding process. These radiated light signals as a whole form a backscatter signal, which is transmitted back through the collimation and focusing component 10. The collimation and focusing component 10 transmits the backscatter signal back to the welding detection component 20, which can detect the welding quality of workpiece B based on the backscatter signal.

[0047] Specifically, the principle of welding quality detection based on the retroreflection signal of the welding detection component 20 is the same as any existing welding detection principle. For example, the welding detection component 20 is equipped with a variety of sensors (such as visible light sensors, reflected light sensors, and infrared light sensors). The visible light sensor can detect ionization light signals, which are photoelectric signals generated by the ionization of metal vapor by the laser. These signals are visible to the naked eye (bluish or yellowish). The intensity of the ionization light signal is closely related to the volume and degree of ionization of the metal vapor, and can reflect changes in power, changes in defocusing, dust removal, spatter, and surface contamination. The reflected light sensor can detect the light signal reflected back to the weld joint by the laser that hits the material surface but is not absorbed by the base material. The infrared light sensor can detect the thermal radiation signal in the retroreflection signal. The thermal radiation signal is mainly the photoelectric signal emitted from the surface of the molten pool towards the weld joint. The infrared radiation of the molten pool is mainly related to the area and temperature of the molten pool, and can reflect power fluctuations, incomplete welds, weld burn-through, weld misalignment, and impurity contamination. Based on the above principles, the welding quality can be determined based on the signal intensity detected by each sensor.

[0048] The laser welding equipment designed above uses a collimating and focusing component to focus the incident laser from an external laser emitting device onto the workpiece for welding. The reflected signal generated by the workpiece is then returned to the welding detection component, which can detect the welding quality based on the received reflected signal. This allows the designed laser welding equipment and system to detect defects in the welding process, thereby improving the quality and safety of welding workpieces (such as new energy motors).

[0049] In an optional implementation of this embodiment, such as Figure 2 As shown, the collimation and focusing assembly 10 designed in this scheme may include a collimating lens group 110, an adjustable reflective lens group 120, and a focusing lens group 130. The collimating lens group 110 is disposed between the external laser generating device A and the adjustable reflective lens group 120. The adjustable reflective lens group 120 is disposed between the collimating lens group 110 and the focusing lens group 130. The focusing lens group 130 is disposed between the adjustable reflective lens group 120 and the welding workpiece B.

[0050] In the above embodiment, the collimating lens group 110 collimates the incident laser emitted by the external laser generator A and transmits it to the adjustable reflective lens group 120. The adjustable reflective lens group 120 reflects the incident laser transmitted by the collimating lens group 110 and transmits it to the focusing lens group 130. The focusing lens group 130 focuses the incident laser transmitted by the adjustable reflective lens group 120 so that the focused spot falls on the welding workpiece B, thereby realizing the welding of the workpiece B. The reflected signal is transmitted back to the collimating lens group 110 through the focusing lens group 130 and the adjustable reflective lens group 120, and the collimating lens group 110 transmits the reflected signal to the welding detection component 20. In addition, the adjustable reflective lens group 120 designed in this scheme can also adjust the position of the incident laser transmitted to the focusing lens group, thereby adjusting the position of the focused spot of the focusing lens group 130. This allows for precise welding of each welding area individually, forming in one step, eliminating errors caused by imaging distortion at the lens edge, and significantly improving equipment stability and production efficiency.

[0051] In an optional implementation of this embodiment, as a specific implementation method, such as Figure 3 As shown, the collimating lens group 110 designed in this scheme may include an optical fiber interface 1110, a protective mirror 1120, a collimating mirror 1130, and a first beam combiner 1140. The protective mirror 1120 is located between the optical fiber interface 1110 and the collimating mirror 1130 along the optical axis of the incident laser. The collimating mirror 1130 is located between the protective mirror 1120 and the first beam combiner 1140 along the optical axis of the incident laser. The first beam combiner 1140 is located between the collimating mirror 1130 and the adjustable reflective lens assembly 120.

[0052] In the above embodiment, the incident laser passes through the fiber optic interface 1110, the protective lens 1120, and the collimating lens 1130 to reach the first beam combiner 1140. The laser is then reflected by the first beam combiner 1140 into the adjustable reflective lens group 120. The collimating lens 1130 has a collimation and focusing function, which can change the Z-axis position of the focal spot of the focusing lens group 130, thereby expanding the process window. The feedback signal generated by the welded workpiece B can be transmitted back to the first beam combiner 1140 through the adjustable reflective lens group 120. Since the first beam combiner 1140 only reflects light signals within a certain wavelength range, the feedback signal generated by the welded workpiece B has a different wavelength than the incident laser. Therefore, the feedback signal is transmitted through the first beam combiner 1140 instead of reflected. Based on this, the feedback signal is transmitted through the first beam combiner 1140 to the welding detection component for detection.

[0053] In an optional embodiment of this design, the adjustable reflective lens group 120 can be any galvanometer module of currently available laser welding equipment. Specifically, as one possible implementation, such as... Figure 4 As shown, the adjustable reflective lens group 120 designed in this scheme may include a first driving member 1210, a second driving member 1220, a first reflector 1230 and a second reflector 1240. The first reflector 1230 is disposed on the first driving member 1210, the second reflector 1240 is disposed on the second driving member 1220, the first reflector 1230 is disposed between the collimating lens group 110 and the second reflector 1240, and the second reflector 1240 is disposed between the first reflector 1230 and the focusing lens group 130.

[0054] The adjustable reflective lens group 120 designed above, with the first reflector 1230 and the second reflector 1240, can reflect the incident laser transmitted by the collimating lens group 110 to the focusing lens group 130. The first driving member 1210 can drive the first reflector 1230 to rotate, and the second driving member 1220 can drive the second reflector 1240 to rotate. In this way, the reflection angle of the first reflector 1230 and the second reflector 1240 can be adjusted, thereby adjusting the position of the incident laser transmitted to the focusing lens group, and thus adjusting the position of the focused spot of the focusing lens group 130.

[0055] In an optional embodiment of this example, as one possible implementation, the focusing lens group 130 designed in this solution can specifically use any field lens currently available on the market as the focusing lens, or other lenses with focusing characteristics can also be used.

[0056] In an optional implementation of this embodiment, such as Figure 3As shown, the welding detection component 20 designed in this scheme may include a welding detection sensor 210 and a second beam combiner 220. The second beam combiner 220 is disposed between the welding detection sensor 210 and the collimating and focusing component 10. Specifically, the second beam combiner 220 may be disposed between the first beam combiner 1140 and the welding detection sensor 210.

[0057] As described above, in this embodiment, since the first beam combiner 1140 only reflects light signals within a certain wavelength range, the return signal generated by the workpiece B during welding has a different wavelength range than the incident laser. Therefore, the return signal is transmitted through the first beam combiner 1140 instead of being reflected. Based on this, the return signal is transmitted to the second beam combiner 220 through the first beam combiner 1140. Since the ion light signal, reflected light signal, and infrared radiation light signal in the return signal are within the reflection wavelength range of the second beam combiner 220, the second beam combiner 220 can reflect the ion light signal, reflected light signal, and infrared radiation light signal in the return signal, so that the reflected ion light signal, reflected light signal, and infrared radiation light signal are transmitted to the welding detection sensor 210.

[0058] As mentioned earlier, the welding detection sensor 210 can be equipped with the visible light sensor, reflected light sensor and infrared light sensor described above, to detect the intensity of ion light signal, reflected light signal and infrared radiation light signal in the reflected signal, thereby realizing welding quality detection. Its detection principle will not be elaborated here.

[0059] In the above implementation, this solution uses a second beam combiner to reflect only a portion of the optical radiation signal, thereby filtering out the optical radiation signal that is not needed for welding quality detection in the reflected signal, and thus improving the accuracy of welding quality detection.

[0060] In an optional implementation of this embodiment, such as Figure 5 As shown, the laser welding equipment designed in this scheme also includes a camera 30 and a camera lens group 40. The camera lens group 40 is disposed between the welding detection component 20 and the camera 30. Specifically, the camera lens group 40 can be disposed between the second beam combiner 220 and the camera 30.

[0061] In the above embodiment, since the second beam combiner 220 can only reflect signals within a certain wavelength range, the ion light signal, reflected light signal, and infrared radiation light signal in the reflected signal are reflected by the second beam combiner 220 to the welding detection sensor 210. However, the reflected signal also includes light radiation signals in a wavelength range that can pass through the second beam combiner 220. After passing through the second beam combiner 220, the light radiation signals in this wavelength range are transmitted to the camera lens group 40, and then to the camera 30. The camera 30 can capture the transmitted light radiation signals, and then use software to process the results captured by the camera 30 to identify the position information of the workpiece, thereby ensuring the accuracy of the laser welding position.

[0062] As a specific implementation method, such as Figure 5 As shown, the camera lens group 40 designed in this scheme may specifically include a filter 410 and a third reflecting mirror 420. The filter 410 is disposed between the second beam combiner 220 and the third reflecting mirror 420, and the third reflecting mirror 420 is disposed between the filter 410 and the lens of the camera 30.

[0063] In the above embodiment, since the camera 30 can only capture light radiation signals within a certain wavelength range, the light radiation signals in the wavelength range transmitted through the second beam combiner 220 can first be filtered by a filter, so that the signal filtered by the filter 410 only contains light radiation signals that can be captured by the camera. The signal filtered by the filter 410 is reflected by the third reflector to the lens of the camera 30, thereby enabling the camera to capture the signal filtered by the filter 410, and then the software processes it to identify the position information of the workpiece, ensuring the accuracy of the laser welding position.

[0064] In an optional implementation of this embodiment, such as Figure 6 As shown, the laser welding equipment designed in this scheme also includes a light source 50, which is set between the collimating and focusing assembly 10 and the workpiece B to be welded. Specifically, the light source 50 is set between the focusing lens group 130 and the workpiece B to be welded. The light source 50 provides a suitable lighting environment for the workpiece B to be welded, thereby improving the contrast, clarity and accuracy of the images captured by the camera, and helping the camera 30 to more accurately identify, detect and analyze information such as the weld position.

[0065] In an optional implementation of this embodiment, such as Figure 6 As shown, the laser welding equipment designed in this scheme also includes an air knife assembly 60, which is disposed between the collimating and focusing assembly 10 and the welding workpiece B. The air knife assembly 60 can clean the dust, exhaust gas and other contaminants from the collimating and focusing assembly and the welding workpiece, thereby protecting the optical components and improving the welding accuracy.

[0066] This application also provides a laser welding system, such as Figure 7 As shown, the laser welding system includes an external laser generating device A and a laser welding device 1 as described in any of the optional embodiments above. The external laser generating device A is connected to the input end of the collimation and focusing assembly 10 of the laser welding device 1.

[0067] In the laser welding system designed above, the external laser generating device A can send incident laser light to the collimation and focusing component 10 of the laser welding equipment. The collimation and focusing component 10 receives the incident laser light emitted by the external laser generating device A and collimates and focuses the incident laser light onto the workpiece B, thereby performing welding processing on the workpiece B. During the laser welding process on the workpiece B, ion light signals (metal vapor signals), laser reflection signals, and molten pool thermal radiation signals are generated, etc. These radiated light signals can reflect the welding status and whether defects are generated during the welding process. These radiated light signals as a whole form a backscatter signal, which is transmitted back through the collimation and focusing component 10. The collimation and focusing component 10 transmits the backscatter signal back to the welding detection component 20, which can detect the welding quality of the workpiece B based on the backscatter signal.

[0068] The laser welding system designed above, since it includes any of the optional embodiments mentioned above, can focus the incident laser from an external laser emitting device onto the workpiece through a collimating and focusing component to perform welding on the workpiece, and return the echo signal generated by the workpiece to the welding detection component, so that the welding detection component can detect the welding quality based on the received echo signal. In this way, the designed laser welding equipment and its laser welding system can detect defects in the welding process, thereby improving the welding quality and safety of the workpiece (such as a new energy motor).

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A laser welding apparatus characterized by comprising: The laser welding device comprises a collimating and focusing assembly and a welding detection assembly; an input end of the collimating and focusing assembly is configured to be connected with an external laser generating device, the collimating and focusing assembly is arranged between the welding detection assembly and a welding workpiece, and the collimating and focusing assembly is connected with the welding detection assembly; the collimating and focusing assembly is configured to receive incident laser emitted by the external laser generating device, focus the incident laser on the welding workpiece, and transmit a back reflection signal generated by the welding workpiece to the welding detection assembly; the welding detection assembly is configured to receive the back reflection signal transmitted by the collimating and focusing assembly, wherein the back reflection signal is used for detecting welding quality.

2. The laser welding apparatus according to claim 1, characterized by, The collimating and focusing assembly comprises a collimating lens group, an adjustable reflecting lens group and a focusing lens group; the collimating lens group is arranged between the external laser generating device and the adjustable reflecting lens group, and is configured to transmit the incident laser to the adjustable reflecting lens group; the adjustable reflecting lens group is arranged between the collimating lens group and the focusing lens group, and is configured to transmit the incident laser to the focusing lens group and adjust the position of the incident laser transmitted to the focusing lens group; the focusing lens group is arranged between the adjustable reflecting lens group and the welding workpiece, and is configured to focus the incident laser transmitted by the adjustable reflecting lens group on the welding workpiece.

3. The laser welding apparatus of claim 2, wherein, The collimating lens group comprises a fiber interface, a protection mirror, a collimating mirror and a first beam combining mirror; the fiber interface is configured to be connected with the external laser generating device; the protection mirror is arranged between the fiber interface and the collimating mirror along an optical axis of the incident laser, the collimating mirror is arranged between the protection mirror and the first beam combining mirror along the optical axis of the incident laser, and the first beam combining mirror is arranged between the collimating mirror and the adjustable reflecting lens group.

4. The laser welding apparatus of claim 2, wherein, The adjustable reflecting lens group comprises a first driving member, a second driving member, a first reflecting mirror and a second reflecting mirror; the first reflecting mirror is arranged on the first driving member, and the second reflecting mirror is arranged on the second driving member, so as to adjust the positions of the first reflecting mirror and the second reflecting mirror; the first reflecting mirror is arranged between the collimating lens group and the second reflecting mirror, and the second reflecting mirror is arranged between the first reflecting mirror and the focusing lens group.

5. The laser welding apparatus of claim 1, wherein, The welding detection assembly comprises a welding detection sensor and a second beam combining mirror; the second beam combining mirror is arranged between the welding detection sensor and the collimating and focusing assembly; the second beam combining mirror is configured to receive the back reflection signal transmitted by the collimating and focusing assembly and reflect and transmit the back reflection signal to the welding detection sensor; wherein the back reflection signal is used for detecting welding quality.

6. The laser welding apparatus of claim 1, wherein, The laser welding device further comprises a camera and a camera lens group; the camera lens group is arranged between the welding detection assembly and the camera, and is configured to transmit the back reflection signal transmitted by the welding detection assembly to the camera.

7. The laser welding apparatus of claim 6, wherein, The camera lens group comprises a filter and a third reflecting mirror; The filter is disposed between the welding inspection assembly and the third mirror, and the third mirror is disposed between the filter and a lens of the camera.

8. The laser welding apparatus of claim 6, wherein, The laser welding device further comprises a light source. The light source is disposed between the collimating and focusing assembly and the welding workpiece.

9. The laser welding apparatus of claim 1, wherein, The laser welding device further comprises a wind knife assembly. The wind knife assembly is disposed between the collimating and focusing assembly and the welding workpiece, and is configured to clean dust and waste gas of the collimating and focusing assembly and the welding workpiece.

10. A laser welding system characterized by, The laser welding system comprises an external laser generating device and the laser welding device according to any one of claims 1-9, and The external laser generating device is connected with an input end of the collimating and focusing assembly of the laser welding device.

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