A laser welding defect detection device

Abstract

This utility model relates to the field of laser welding technology and discloses a laser welding defect detection device, including an optical component, a light-emitting component, a monitoring camera, and a weld defect detection module. The optical component includes a housing and an optical mirror assembly. The housing has a detection cavity and a first end with a detection port connected to the detection cavity. The optical mirror assembly is located inside the detection cavity. The light-emitting component is used to direct collimated probe light into the detection cavity. The monitoring camera is used to receive light from the detection cavity. The weld defect detection module is used to receive light from the detection cavity. The laser welding defect detection device provided by this utility model, through the coordinated operation of the optical component, the light-emitting component, the monitoring camera, and the weld defect detection module, can comprehensively and accurately perform real-time and automated detection of welding defects during the laser welding process, reducing labor costs and helping to improve yield and reduce production costs.

Description

Technical Field

[0001] This utility model relates to the field of laser welding technology, and in particular to a laser welding defect detection device. Background Technology

[0002] Laser welding technology, with its unique advantages such as high precision, high energy density, and low heat-affected zone, is widely used in the manufacturing process of new energy batteries and other products. However, due to the interaction of various factors such as the characteristics of welding materials, complex combinations of process parameters, and the cleanliness of the process, the generation of welding defects is difficult to completely avoid. If these defects are not detected and dealt with in time, once products with welding defects flow into subsequent processes, it may not only lead to difficulties in subsequent assembly, but may even affect the performance and safety of the entire product.

[0003] Currently, many new energy battery production lines commonly use post-weld inspection machines installed after the welding equipment. These machines utilize visual inspection technology in conjunction with manual observation of the weld seams to identify products with welding defects. However, this existing inspection model has the following drawbacks: First, it requires additional manpower for confirmation and judgment, increasing labor costs. Second, due to prolonged focus on repetitive visual inspection, manual labor is prone to visual fatigue, making it difficult to comprehensively and accurately identify whether products have welding defects, thus reducing the product yield. Third, defective products are only discovered after they have left the welding equipment, requiring them to be returned to the welding equipment for rework. This process is not only cumbersome but also consumes more production costs in terms of materials, time, and energy. Utility Model Content

[0004] Aimed at solving at least one of the technical problems existing in the prior art, this utility model aims to provide a laser welding defect detection device that can reduce labor costs and help improve yield and reduce production costs.

[0005] To achieve the above objectives, this utility model provides a laser welding defect detection device, including an optical component, a light-emitting component, a monitoring camera, and a weld defect detection module. The optical component includes a housing and an optical mirror assembly. The housing has a detection cavity and a first end, the first end of which is provided with a detection port communicating with the detection cavity. The optical mirror assembly is disposed within the detection cavity. The light-emitting component is connected to the housing and is used to direct collimated probe light into the detection cavity. The monitoring camera is connected to the housing and located on one side of the light-emitting component, and is used to receive light from the detection cavity. The weld defect detection module is connected to the housing and located on the side of the monitoring camera opposite to the light-emitting component, and is used to receive light from the detection cavity. The optical mirror assembly is configured to allow the collimated probe light in the detection cavity to exit the detection cavity through the detection port, and to allow light entering the detection cavity from the detection port to be transmitted to the monitoring camera and the weld defect detection module.

[0006] In some embodiments, the optical reflector group includes a first reflector and a first half-reflector, wherein the mirror surface of the first reflector and the end face where the detection port is located are arranged at an acute angle; the first half-reflector is located on one side of the first reflector, and the light emission direction of the light-emitting element is arranged at an acute angle to the mirror surface of the first half-reflector.

[0007] In some embodiments, the optical reflector assembly further includes a second half-reflector located on the side of the first half-reflector away from the first reflector, and the central axis of the field of view of the monitoring camera and the mirror surface of the second half-reflector are set at an acute angle.

[0008] In some embodiments, the optical reflector group further includes a second reflector located on the side of the second half-reflector away from the first half-reflector, and the optical axis of the weld defect detection module is set at an acute angle to the mirror surface of the second reflector.

[0009] In some embodiments, the first half-reflector, the second half-reflector, and the second reflector are arranged in parallel and opposite directions.

[0010] In some embodiments, the angle between the mirror surface of the first reflector and the end face of the detection port is α, satisfying: 42°≤a≤48°; and / or, the angle between the light emission direction of the light-emitting element and the mirror surface of the second half-reflector is β, satisfying: 42°≤b≤48°; and / or, the angle between the central axis of the field of view of the monitoring camera and the mirror surface of the first half-reflector is β, satisfying: 2°≤c≤48°; and / or, the angle between the optical axis direction of the weld defect detection module and the mirror surface of the second reflector is β, satisfying: 42°≤d≤48°.

[0011] In some embodiments, the light emission direction of the light-emitting element, the central axis of the field of view of the monitoring camera, and the optical axis of the weld defect detection module are parallel to each other.

[0012] In some embodiments, the optical element further includes a field lens connected to the housing, and the detection port is located between the detection cavity and the field lens.

[0013] In some embodiments, the housing includes a first housing and a second housing, the second housing being detachably connected to the first housing; the first housing has a first cavity, the second housing has a second cavity, the first cavity and the second cavity are connected and combined to form the detection cavity, and the first housing is provided with the detection port; the light-emitting element, the monitoring camera and the weld defect detection module are all connected to the second housing.

[0014] In some embodiments, a drive mechanism is also included, which is connected to the optical element and capable of driving the optical element to move.

[0015] Compared with the prior art, the laser welding defect detection device of this utility model has the following advantages: Collimated detection light is incident into the detection cavity through a light-emitting element, and then guided and transmitted to the detection port by an optical reflector group. The collimated detection light leaving the detection cavity through the detection port can be transmitted to the welding area of ​​the welding equipment and illuminate the welding area. The collimated detection light and the light generated during the welding process are reflected by the welding area and enter the detection cavity through the detection port. The light is transmitted to the monitoring camera through the optical reflector group so that the monitoring camera can capture and monitor the welding trajectory of the welding area in real time, and promptly detect defects in the welding trajectory of the product during the laser welding process through visual monitoring. The light is transmitted to the weld defect detection module through optical elements to detect weld defects. The defect detection module can perform real-time detection of the weld seam in the welding area, and promptly detect weld seam defects in the product during the welding process through weld seam defect identification and analysis. Therefore, the laser welding defect detection device provided by this utility model, through the coordinated cooperation of optical components, light-emitting components, monitoring cameras and weld seam defect detection modules, can realize dual detection functions of visual monitoring and weld seam defect identification and analysis of the welding area of ​​the welding equipment. This allows for comprehensive and accurate real-time and automated detection of welding defects in the laser welding process. It eliminates the need for additional manpower for confirmation and judgment, reducing labor costs, and can promptly detect defective products with welding defects in the welding equipment, which helps to improve the product yield and reduce the consumption of production costs in terms of materials, time and energy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a laser welding defect detection device provided in an embodiment of this utility model;

[0017] Figure 2 This is a partial cross-sectional view of a laser welding defect detection device provided in an embodiment of this utility model;

[0018] Figure 3 This is a schematic diagram showing the angle α formed between the mirror surface of the first reflecting mirror and the end face where the detection port is located, as provided in this embodiment of the utility model.

[0019] Figure 4 This is a schematic diagram showing the angle b formed between the mirror surface of the first semi-reflective mirror and the light-emitting direction of the light-emitting element provided in this embodiment of the utility model.

[0020] Figure 5 This is a schematic diagram showing the angle c formed between the mirror surface of the second half-reflector and the central axis of the field of view of the monitoring camera provided in this embodiment of the utility model.

[0021] Figure 6 This is a schematic diagram showing the angle d formed between the mirror surface of the second reflector and the optical axis of the weld defect detection module provided in this embodiment of the present invention.

[0022] In the diagram, 1 is an optical component; 11 is the outer casing; 12 is the optical mirror assembly; 13 is the field lens; 111 is the first casing; 112 is the second casing; 121 is the first mirror; 122 is the first half-mirror; 123 is the second half-mirror; 124 is the second mirror; 1111 is the first end; 11111 is the detection port; and 11112 is the end face where the detection port is located.

[0023] 100. Detection chamber; 101. First chamber; 102. Second chamber;

[0024] 2. Light-emitting component; 21. Light emission direction;

[0025] 3. Surveillance camera; 31. Center line of view;

[0026] 4. Weld defect detection module; 41. Optical axis direction;

[0027] 5. Drive mechanism. Detailed Implementation

[0028] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 this utility model and simplifying the description, and do not 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 this utility model.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0034] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0035] like Figures 1-6 As shown, a preferred embodiment of the present invention is a laser welding defect detection device, which includes an optical component 1, a light-emitting component 2, a monitoring camera 3, and a weld defect detection module 4.

[0036] The optical component 1 includes a housing 11 and an optical mirror assembly 12. The housing 11 has a detection cavity 100 and a first end 1111. The first end 1111 is provided with a detection port 11111 that communicates with the detection cavity 100. The optical mirror assembly 12 is disposed inside the detection cavity 100. The light-emitting component 2 is connected to the housing 11 and is used to direct collimated detection light into the detection cavity 100. The monitoring camera 3 is connected to the housing 11 and is located on one side of the light-emitting component 2. The monitoring camera 3 is used to receive light from inside the detection cavity 100. The weld defect detection module 4 is connected to the housing 11 and is located on the side of the monitoring camera 3 away from the light-emitting component 2. The weld defect detection module 4 is used to receive light from inside the detection cavity 100. The optical mirror assembly 12 is configured to allow the collimated detection light to leave the detection cavity 100 through the detection port 11111 and to allow the light entering the detection cavity 100 from the detection port 11111 to be transmitted to the monitoring camera 3 and the weld defect detection module 4.

[0037] Based on this technical solution, the collimated detection light is shone into the detection cavity 100 through the light-emitting element 2, and then guided and transmitted to the detection port 11111 by the optical reflector group 12. The collimated detection light leaving the detection cavity 100 through the detection port 11111 can be transmitted to the welding area of ​​the welding equipment and illuminate the welding area. The collimated detection light and the light generated during the welding process are reflected by the welding area and enter the detection cavity 100 through the detection port 11111. The light is transmitted to the monitoring camera 3 through the optical reflector group 12 so that the monitoring camera 3 can capture and monitor the welding trajectory of the welding area in real time, and promptly detect defects in the welding trajectory of the product during the laser welding process through visual monitoring. The light is transmitted to the weld defect detection module 4 through the optical element 1 so that... The weld defect detection module 4 can perform real-time detection of the weld in the welding area and promptly detect weld defects in the product during the welding process through weld defect identification and analysis. Therefore, the laser welding defect detection device provided by this utility model, through the coordinated cooperation of optical component 1, light-emitting component 2, monitoring camera 3 and weld defect detection module 4, can realize dual detection functions of visual monitoring and weld defect identification and analysis of the welding area of ​​the welding equipment. This allows for comprehensive and accurate real-time and automated detection of welding defects in the laser welding process. It eliminates the need for additional manpower for confirmation and judgment, reducing labor costs, and can promptly detect defective products with welding defects in the welding equipment, which helps to improve the product yield and reduce the consumption of production costs in terms of materials, time and energy.

[0038] The monitoring camera 3 and weld defect detection module 4 of the laser welding defect detection device provided by this utility model can continuously collect data and perform real-time data analysis and processing during the product welding process, without affecting the production line efficiency due to data collection.

[0039] In some specific implementations, the monitoring camera 3 and the weld defect detection module 4 have the function of collecting data and reporting it to the cache, which can be viewed and traced by personnel, and facilitate personnel to analyze and process the welding process for improvement and optimization.

[0040] Optionally, the monitoring camera 3 may be, but is not limited to, an industrial CCD camera, a CMOS camera, an infrared camera, etc.

[0041] In this embodiment, the weld defect detection module 4 is an infrared weld defect detection module 4. Specifically, the infrared weld defect detection module 4 can convert the collected infrared light signals into electrical signals, perform online welding detection and analysis, identify welding defects in the product, and perform data analysis and optimization. In other embodiments, the weld defect detection module 4 can also be other weld defect detection modules 4 that can convert light signals into electrical signals, which is not limited here.

[0042] It should be noted that collimated probe light refers to probe light emitted by the light source and collimated to ensure that the light can propagate to the target area with the smallest possible divergence angle. The light can be any type of light, whether it is natural light or artificial light, and it doesn't matter whether the light is collimated or how it propagates, such as reflected or scattered light returning from the welding point and being captured by the monitoring camera.

[0043] See Figure 1 The laser welding defect detection device also includes a drive mechanism 5, which is connected to the optical component 1 and can drive the optical component 1 to move. By driving the optical component 1 with the drive mechanism 5, the distance between the optical component 1 and the welding area can be flexibly adjusted. For larger products, the drive mechanism 5 can move the optical component 1 away from the welding area to ensure that the entire welding area of ​​the product is effectively covered by the collimated detection light emitted by the optical component 1. For welding parts in lower or recessed locations, the drive mechanism 5 can move the optical component 1 closer to the welding area, allowing the collimated detection light emitted by the optical component 1 to get closer to the welding area, ensuring the accuracy and clarity of the detection. This flexible adjustment capability greatly improves the adaptability of the laser welding defect detection device to welded workpieces of different sizes and positions, expanding the application range of the laser welding defect detection device.

[0044] Specifically, the drive mechanism 5 is connected to the housing 11.

[0045] In this embodiment, the driving mechanism 5 is a lifting driving mechanism, which is used to drive the optical component 1 to rise away from the welding area or to fall closer to the welding area.

[0046] The driving mechanism 5 can be a driving device that can drive the optical component 1 to move, including but not limited to hydraulic cylinders, air cylinders, linear modules, etc.

[0047] See Figures 1-2 The outer shell 11 includes a first shell 111 and a second shell 112, the second shell 112 being detachably connected to the first shell 111; the first shell 111 has a first cavity 101, the second shell 112 has a second cavity 102, the first cavity 101 and the second cavity 102 are connected and combined to form a detection cavity 100, and one end of the first shell 111 is provided with a detection port 11111; the light-emitting element 2, the monitoring camera 3 and the weld defect detection module 4 are all connected to the second shell 112.

[0048] By dividing the outer shell 11 into a detachable structure of a first shell 111 and a second shell 112, it is beneficial to realize the modular design and manufacturing of the detection cavity 100, facilitate the installation, debugging and subsequent maintenance of the optical reflector group 12 inside the detection cavity 100, and improve the assemblability and maintainability of the device.

[0049] The optical component 1 also includes a field lens 13, which is connected to the first end 1111, and the detection port 11111 is located between the detection cavity 100 and the field lens 13.

[0050] The field lens 13 can guide the light emitted from the detection port 11111 to better transmit the collimated detection light to the welding area, providing a clear and bright optical signal for the weld defect detection module 4 and the monitoring camera 3, which helps the monitoring camera 3 and the weld defect detection module 4 to detect smaller welding defects and improve detection accuracy.

[0051] Specifically, the first end 1111 is the end of the first housing 111 facing the welding area.

[0052] In this embodiment, the detection port 11111 is located between the field mirror and the first reflecting mirror 121.

[0053] In some other embodiments, the field lens 13 may also be located within the detection port 11111.

[0054] See Figures 2-6 The optical mirror assembly 12 includes a first mirror 121 and a first half-mirror 122. The mirror surface of the first mirror 121 and the end face 11112 where the detection port 11111 is located are set at an acute angle. The first half-mirror 122 is located on one side of the first mirror 121. The light emission direction 21 of the light-emitting element 2 and the mirror surface of the first half-mirror are set at an acute angle. The first half-mirror 122 is used to reflect the collimated detection light emitted by the light-emitting element 2 to the first mirror 121. The first mirror 121 is used to make the collimated detection light leave the detection cavity 100 through the detection port 11111.

[0055] By setting the first reflector 121 to form an acute angle with the end face 11112 where the detection port 11111 is located, the collimated detection light can be directed at the welding area at a reasonable angle after passing through the first half-reflector 122 and the first reflector 121, ensuring that the detection light can effectively cover the weld position and improve the accuracy and consistency of the detection area.

[0056] The first half-reflector 122 is located on one side of the first reflector 121 and is set at an acute angle to the light emission direction 21 of the light-emitting element 2, so that the collimated detection light emitted by the light-emitting element 2 can be effectively reflected by the first half-reflector 122 to the first reflector 121.

[0057] The first half-reflector 122 has both reflection and transmission functions. It can provide an optical path for subsequent reflected light signal acquisition (such as scattered light from the welding area, plasma radiation light, etc.) without affecting the transmission of the probe light. This enables the path separation and collaborative management of the probe light and the feedback light, and provides a structural basis for the signal acquisition of the subsequent monitoring camera 3 and defect detection module.

[0058] The optical reflector assembly 12 also includes a second half-reflector 123, which is located on the side of the first half-reflector 122 away from the first reflector 121. The central axis 31 of the field of view of the monitoring camera 3 and the mirror surface of the second half-reflector 123 are set at an acute angle. The first reflector 121 can reflect light entering the detection cavity 100 from the detection port 11111 to the second half-reflector 123, and the second half-reflector 123 can reflect light to the monitoring camera 3.

[0059] By setting the second half-reflector 123 on the side of the first half-reflector 122 away from the first half-reflector 121, and setting it at an acute angle to the central axis 31 of the field of view of the monitoring camera 3, the light returning from the welding area and entering the detection cavity 100 through the detection port 11111 can be reflected sequentially by the first reflector 121 and the second half-reflector 123 and then accurately guided into the field of view of the monitoring camera 3, thereby achieving clear acquisition of the image of the welding area.

[0060] Because the second half-reflector 123 has half-transmission and half-reflection characteristics, it can not only reflect part of the light to the monitoring camera 3 for image acquisition, but also allow another part of the light to pass through, providing an optical signal input path for subsequent detection modules (such as weld defect detection module 4).

[0061] In some embodiments, the optical reflector group 12 further includes a second reflector 124, which is located on the side of the second half-reflector 123 away from the first half-reflector 122. The optical axis direction 41 of the weld defect detection module 4 and the mirror surface of the second reflector 124 are set at an acute angle. The first reflector 121 can reflect light entering the detection cavity 100 from the detection port 11111 to the second reflector 124, and the second half-reflector 123 can reflect light to the weld defect detection module 4.

[0062] By setting the second reflector 124 on the side of the second half-reflector 123 away from the first half-reflector 122 and at an acute angle to the optical axis direction 41 of the weld defect detection module 4, the light returning from the welding area and entering the detection cavity 100 through the detection port 11111 can be guided by the first reflector 121, and then reflected sequentially by the second half-reflector 123 and the second reflector 124, and finally accurately guided into the light receiving area of ​​the weld defect detection module 4, thereby achieving high-sensitivity identification of defect features.

[0063] The propagation process of light in optical component 1 is as follows: Light-emitting component 2 emits collimated detection light into detection cavity 100. The collimated detection light is reflected by the first half-reflector 122 to the first reflector 121, and then reflected from the first reflector 121 to the detection port 11111. Through the detection port 11111, the light is transmitted to the welding area to illuminate the welding area. The collimated detection light and the light generated during the welding process are reflected by the welding area to form light entering the first cavity 101 through the detection port 11111. The light is reflected by the first reflector 121 to the first half-reflector 122 and transmitted through the first half-reflector 122 to the second half-reflector 123. A portion of the light is reflected by the second half-reflector 123 to the monitoring port 123. The monitoring camera 3 enables real-time shooting and monitoring of the welding trajectory in the welding area. Based on a preset normal welding image template or feature library, the monitoring camera 3 compares and analyzes the real-time acquired images to determine whether there are defects in the welding trajectory of the welding area. In addition, part of the light is transmitted through the second half-reflector 123 to the second reflector 124, and the other part of the light is reflected by the second reflector 124 to the weld defect detection module 4, so that the weld defect detection module 4 can detect the weld in the welding area in real time. The weld defect detection module 4 converts the collected light signal into an electrical signal, performs online welding detection analysis and judgment, and determines whether there are defects in the weld of the product.

[0064] Specifically, in this embodiment, visible light from the light entering the detection cavity 100 from the welding area is transmitted to the monitoring camera 3 via the first reflector 121, the second half-reflector 123, and the first half-reflector 122; invisible light (e.g., infrared light) from the light entering the light-emitting element 2 from the welding area is transmitted to the weld defect detection module 4 via the first reflector 121, the first half-reflector 122, the second half-reflector 123, and the second reflector 124.

[0065] In this embodiment, the first reflecting mirror 121 is a total reflection mirror, and the second reflecting mirror 124 is a total reflection mirror.

[0066] In some other embodiments, the first reflector 121 may also be a half-reflector, and the second reflector 124 may also be a half-reflector.

[0067] In some embodiments, the first half-reflector 122, the second half-reflector 123, and the second reflector 124 are arranged parallel to each other and opposite to each other.

[0068] By setting the first half-reflector 122, the second half-reflector 123, and the second reflector 124 as parallel mirror structures, the consistency and stability of the beam propagation direction between each optical path can be effectively guaranteed, avoiding optical path offset or signal attenuation caused by mirror angle deviation, thereby improving the optical transmission efficiency and signal acquisition accuracy of the entire optical system.

[0069] In this embodiment, the first reflector 121 is disposed within the first cavity 101, and the first half-reflector 122, the second half-reflector 123, and the second reflector 124 are disposed within the second cavity 102. By placing the first reflector 121 within the first cavity 101 and concentrating the first half-reflector 122, the second half-reflector 123, and the second reflector 124 within the second cavity 102, a functional partitioning layout of the optical elements is achieved. This helps improve the utilization efficiency of the internal space of the detection cavity 100 and provides a more suitable installation environment for different functional components.

[0070] Optionally, the angle between the mirror surface of the first reflector 121 and the end face 11112 of the detection port is α, satisfying: 42°≤α≤48°. By limiting the angle α to 42 to 48°, it can be ensured that the collimated detection light reflected from the first reflector 121 can be emitted from the detection port 11111 at a better angle. Within this angle range, the collimated detection light can uniformly and comprehensively cover the welding area, avoiding blind spots or excessive concentration of light in the welding area. This allows the difference in light intensity received by the edge and center of the welding area to be controlled within a very small range, which helps to obtain more accurate optical information about the welding area for the monitoring camera 3 and the weld defect detection module 4, and improves the accuracy of welding defects during the welding process.

[0071] In this embodiment, a = 45°. By limiting the included angle a to 45°, it can be ensured that the collimated probe light reflected from the first reflector 121 can be emitted from the detection port 11111 at the optimal angle.

[0072] In other embodiments, 'a' can also be any angle such as 42°, 43°, 44°, 46°, 47°, and 48° that satisfies 42°≤a≤48°, and is not limited here.

[0073] Optionally, the angle between the light emission direction 21 of the light-emitting element 2 and the mirror surface of the first semi-reflecting mirror 122 is b, satisfying: 42°≤b≤48°. By limiting the angle b to 42° to 48°, the collimated detection light emitted by the light-emitting element 2 can be incident on the first semi-reflecting mirror 122 at a better angle. Within this angle range, after being reflected by the second semi-reflecting mirror 123, the collimated detection light can be efficiently coupled into the optical path of the entire optical system of the light-emitting element, reducing collimated detection light loss and improving light energy utilization. This allows stronger and more stable light to reach the welding area, thereby improving the intensity and quality of the reflected light in the welding area. This provides clearer and more accurate optical information for the monitoring camera 3 and the weld defect detection module 4, helping to more accurately identify welding defects.

[0074] In this embodiment, b = 45°. By limiting the included angle b to 45°, the collimated detection light emitted by the light-emitting element 2 can be incident on the first half-reflector 122 at the optimal angle.

[0075] In other embodiments, b can also be any angle such as 42°, 43°, 44°, 46°, 47° and 48° that satisfies 42°≤b≤48°, and is not limited here.

[0076] Optionally, the angle between the central axis 31 of the field of view of the monitoring camera 3 and the mirror surface of the second semi-reflector 123 is c, satisfying: 42°≤c≤48°. By limiting the angle c to 42° to 48°, the monitoring camera 3 can receive the light reflected from the second semi-reflector 123 at a better angle; within this angle range, the light can be more evenly distributed on the imaging sensor of the monitoring camera 3, reducing image distortion, vignetting, and other problems caused by poor light incident angles, thereby providing the monitoring camera 3 with a clearer and more complete image of the welding area.

[0077] In this embodiment, c = 45°. By limiting the included angle c to 45°, the monitoring camera 3 can receive the light reflected from the second half-reflector 123 at the optimal angle.

[0078] In other embodiments, c can also be any angle such as 42°, 43°, 44°, 46°, 47° and 48° that satisfies 42°≤c≤48°, and is not limited here.

[0079] The angle d between the optical axis direction 41 of the weld defect detection module 4 and the mirror surface of the second reflector 124 satisfies: 42°≤d≤48°. By setting the angle d between 42° and 48°, the weld defect detection module 4 can receive the light reflected by the second reflector 124 at a better angle. Within this angle range, the weld defect detection module 4 can more effectively capture light signals from the welding area, enabling it to more sensitively perceive subtle optical feature changes related to welding defects. This provides more accurate data for subsequent defect identification and analysis, thereby improving the detection sensitivity of the weld defect detection module 4 for welding defects.

[0080] In this embodiment, d = 45°. This allows the weld defect detection module 4 to receive the light reflected by the second reflector 124 at the optimal angle.

[0081] In other embodiments, d can also be any angle such as 42°, 43°, 44°, 46°, 47° and 48° that satisfies 42°≤d≤48°, and is not limited here.

[0082] The light emission direction 21 of the light-emitting element 2, the central axis 31 of the field of view of the monitoring camera 3, and the optical axis direction 41 of the weld defect detection module 4 are parallel to each other.

[0083] By setting the light emission direction 21 of the light-emitting element 2 parallel to the central axis 31 of the field of view of the monitoring camera 3, the conditions of light illumination and imaging by the monitoring camera 3 can be basically the same during the inspection of different batches of products. This helps to ensure that the inspection standards for each welding area are consistent and avoids deviations in the inspection results of different batches of products due to differences in light and imaging conditions. This improves the consistency and reliability of the laser welding defect detection device for the inspection of different batches of products.

[0084] In this embodiment, the central axis 31 of the field of view of the monitoring camera 3 and the optical axis 41 of the weld defect detection module 4 are parallel. The monitoring camera 3 is responsible for acquiring intuitive image information of the welding area, while the weld defect detection module 4 focuses on the feature analysis of weld defects. By setting the central axis 31 of the field of view of the monitoring camera 3 and the optical axis 41 of the weld defect detection module 4 to be parallel, the monitoring camera 3 and the weld defect detection module 4 can acquire optical information of the welding area from the same perspective. This makes the image details captured by the monitoring camera 3 highly coincide with the area corresponding to the optical signal received by the weld defect detection module 4. As a result, when judging defects, the weld defect detection module 4 can more accurately match the image features with its own detection data, improve the ability to identify small and complex welding defects, help reduce false judgments and missed judgments, and improve detection accuracy.

[0085] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A laser welding defect detection device, characterized in that, include: An optical component includes a housing and an optical mirror assembly. The housing has a detection cavity and a first end. The first end is provided with a detection port that communicates with the detection cavity. The optical mirror assembly is disposed inside the detection cavity. A light-emitting element, which is connected to the housing and used to direct collimated probe light into the detection cavity; A monitoring camera, which is connected to the housing and located on one side of the light-emitting element, is used to receive light from the detection cavity; A weld defect detection module is connected to the housing and located on the side of the monitoring camera away from the light-emitting element. The weld defect detection module is used to receive light from the detection cavity. The optical reflector group is configured to allow collimated probe light in the detection cavity to exit the detection cavity through the detection port, and to allow light entering the detection cavity from the detection port to be transmitted to the monitoring camera and the weld defect detection module.

2. The laser welding defect detection device according to claim 1, characterized in that, The optical reflector assembly includes a first reflector and a first semi-reflector. The mirror surface of the first reflector and the end face of the detection port are set at an acute angle. The first semi-reflector is located on one side of the first reflector, and the light emission direction of the light-emitting element is set at an acute angle to the mirror surface of the first semi-reflector.

3. The laser welding defect detection device according to claim 2, characterized in that, The optical reflector assembly also includes a second half-reflector, which is located on the side of the first half-reflector away from the first reflector. The central axis of the field of view of the monitoring camera and the mirror surface of the second half-reflector are set at an acute angle.

4. The laser welding defect detection device according to claim 3, characterized in that, The optical reflector group also includes a second reflector, which is located on the side of the second half-reflector away from the first half-reflector. The optical axis of the weld defect detection module is set at an acute angle to the mirror surface of the second reflector.

5. The laser welding defect detection device according to claim 4, characterized in that, The first half-reflector, the second half-reflector, and the second reflector are arranged in parallel and opposite directions.

6. The laser welding defect detection device according to claim 5, characterized in that, The angle between the mirror surface of the first reflector and the end face of the detection port is α, which satisfies: 42°≤α≤48°; And / or, the angle between the light-emitting direction of the light-emitting element and the mirror surface of the second half-reflector is b, satisfying: 42°≤b≤48°; And / or, the angle between the central axis of the field of view of the surveillance camera and the mirror surface of the first semi-reflective mirror is c, satisfying: 2°≤c≤48°; And / or, the angle between the optical axis direction of the weld defect detection module and the mirror surface of the second reflector is d; It satisfies: 42°≤d≤48°.

7. The laser welding defect detection device according to any one of claims 4-6, characterized in that, The light-emitting direction of the light-emitting element, the central axis of the field of view of the monitoring camera, and the optical axis of the weld defect detection module are parallel to each other.

8. The laser welding defect detection device according to any one of claims 1-6, characterized in that, The optical component also includes a field lens, which is connected to the first end.

9. The laser welding defect detection device according to any one of claims 1-6, characterized in that, The outer casing includes a first casing and a second casing, wherein the second casing is detachably connected to the first casing; The first housing has a first cavity, and the second housing has a second cavity. The first cavity and the second cavity are connected and combined to form the detection cavity. The first housing is provided with the detection port. The light-emitting element, the monitoring camera, and the weld defect detection module are all connected to the second housing.

10. The laser welding defect detection device according to any one of claims 1-6, characterized in that, It also includes a drive mechanism, which is connected to the optical element and is capable of driving the optical element to move.

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