A combined light source for detecting defects on a circular arc surface

Abstract

The utility model relates to machine vision light source technical field, concretely relates to a kind of combined light source of detecting arc surface defect, including a coaxial light source, including shell, light splitter and first light source, the shell upper and lower side is equipped with detection port and light outlet respectively, the light splitter is obliquely arranged between detection port and light outlet, the first light source emergent light is guided by light splitter and provides the illumination perpendicular to the normal direction of the measured arc surface direction of law;A linear light source, by mounting bracket is set at the light outlet, for providing linear light with low angle inclination to irradiate the measured arc surface;The utility model provides a kind of combined light source of detecting arc surface defect, to realize the uniform illumination of arc surface workpiece whole, again, the profile of the defects such as depression, scratch can be highlighted using specific angle strong light, improve the accuracy and reliability of detection.

Description

Technical Field

[0001] This utility model relates to the field of machine vision light source technology, specifically to a combined light source for detecting defects on arc surfaces. Background Technology

[0002] In industrial machine vision, the lighting scheme is crucial for surface defect detection of workpieces with curved surfaces (such as bearings, bottles, and shaft parts). Existing detection schemes typically use a single type of light source, such as a coaxial light source, which provides relatively uniform illumination and helps to reveal surface features such as scratches and pits.

[0003] Conventional coaxial light sources suffer from significant light energy loss due to the presence of optical components such as beam splitters in the optical path, resulting in low overall brightness and making it difficult to meet the brightness requirements of high-reflectivity curved surfaces or high-speed imaging. Moreover, while coaxial light sources can provide uniform illumination, they do not offer significant contrast for minute depressions parallel to the surface tangent or features at specific angles, which can easily lead to missed detections.

[0004] Existing light sources cannot simultaneously meet the composite detection requirements of high-brightness overall illumination and high-contrast highlighting of specific concave features. Therefore, there is an urgent need for a new type of light source that can balance high brightness and multi-angle light effect to efficiently and accurately detect various defects on curved surfaces. Utility Model Content

[0005] Technical problems to be solved In view of the above-mentioned shortcomings of the existing technology, this utility model provides a combined light source for detecting defects on arc surfaces. It aims to achieve uniform illumination of the entire arc surface workpiece while using strong light at a specific angle to highlight the outline of defects such as dents and scratches, thereby improving the accuracy and reliability of detection.

[0006] Technical solution To achieve the above objectives, this utility model provides the following technical solution: This utility model provides a combined light source for detecting defects on a circular arc surface, including a coaxial light source, a housing, a beam splitter, and a first light source. The housing has a detection port and a light output port on its upper and lower sides, respectively. The beam splitter is inclinedly disposed between the detection port and the light output port. The light emitted from the first light source is guided by the beam splitter to provide illumination perpendicular to the normal direction of the circular arc surface being measured. A linear light source is mounted at the light outlet via a mounting bracket to provide linear light that illuminates the measured arc surface at a low angle. The linear light source is rotatably mounted on the mounting bracket, which is connected to the housing, so that the linear light source and the coaxial light source are integrated into one unit and can simultaneously illuminate the measured arc surface.

[0007] Furthermore, the first light source is distributed at a 45° angle to the beam splitter and is disposed on the side plate of the housing. A light-diffusing plate is disposed parallel to the side of the first light source facing the beam splitter, and a heat sink is attached to the other side.

[0008] Furthermore, it also includes an antireflective film that covers the detection port.

[0009] Furthermore, a rectangular slot is provided on the front panel of the housing, the main body of the mounting bracket is embedded in the rectangular slot, and a pair of first connecting holes are provided on the corresponding position of the rear panel of the housing.

[0010] Furthermore, the linear light source includes a lamp holder, a second light source, and a focusing rod. The lamp holder has a mounting groove with a linear opening inside. The second light source and the focusing rod are installed in the mounting groove. The light from the second light source is focused by the focusing rod and then emitted through the linear opening.

[0011] Furthermore, the lamp holder includes a base for heat dissipation of the second light source, and protective plates located on the front and rear sides of the base and plugs located on the left and right sides of the base. A cooling fan is provided on the outer surface of the base.

[0012] Furthermore, a second connecting hole adapted to the first connecting hole is provided on the opposite outer surface of the plug, and the plug on one side is fixedly connected to the mounting bracket. The mounting bracket is provided with a third connecting hole and an arc-shaped groove that match the second connecting hole. The linear light source can rotate relative to the mounting bracket along the arc-shaped groove.

[0013] Beneficial effects The technical solution provided by this utility model has the following advantages compared with the known public technology: By combining coaxial and linear light sources, the linear light source and its focusing rod provide high-brightness, highly directional illumination, effectively compensating for the low brightness of the coaxial light source. The coaxial light source is responsible for revealing defects in the positive direction of the surface, while the low-angle linear light can effectively highlight features such as depressions and scratches in the tangential direction on the arc surface. The two complement each other, greatly reducing the false negative rate.

[0014] Furthermore, the integrated design of the two light sources results in a compact and robust structure, making it easy to integrate into existing vision inspection systems. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a top perspective view of the combined light source of this utility model; Figure 2 This is a bottom perspective view of the combined light source of this utility model; Figure 3 This is a schematic diagram of the linear light source of this utility model installed along the rectangular slot; Figure 4 This is a cross-sectional schematic diagram of the combined light source of this utility model; Figure 5 This is a schematic cross-sectional view of the linear light source of this utility model; The labels in the diagram represent: 10, coaxial light source; 11, housing; 12, beam splitter; 13, first light source; 14, detection port; 15, light outlet; 16, light homogenizer; 17, heat sink; 18, antireflective film; 19, rectangular slot; 101, first connecting hole; 20, linear light source; 21, base; 22, second light source; 23, focusing rod; 24, protective plate; 25, plug; 26, cooling fan; 27, cover plate; 251, second connecting hole; 30, mounting bracket; 31, third connecting hole; 32, arc-shaped slot; 33, handle. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0018] The present invention will be further described below with reference to the embodiments.

[0019] Example: This utility model provides a combined light source for detecting defects on arc surfaces, as shown in the reference. Figure 1-5 It mainly consists of two parts: a coaxial light source module 10 and a linear light source module 20. Its primary purpose is to solve the problem of insufficient brightness and unadjustable light effect of a single light source. Through the combination of coaxial light source 10 and linear light source 20, coaxial light source 10 and linear light source 20 can be independently powered and controlled, providing at least three basic light effects (coaxial light, linear light, and combined light). Users can flexibly select and switch according to different defect types, which greatly enhances the adaptability of the light source.

[0020] First, the coaxial light source module 10 forms a sealed metal enclosure. Its main structure includes a cubic metal shell 11, a beam splitter 12, and a first light source 13. The shell 11 has a detection port 14 and a light emission port 15 on its upper and lower sides, respectively. The beam splitter 12 is tilted between the detection port 14 and the light emission port 15. The light emitted from the first light source 13 is guided by the beam splitter 12 to provide illumination perpendicular to the normal direction of the measured arc surface. The detection port 14 is covered with an anti-reflection film 18. The first light source 13 is a high-brightness LED soldered onto a planar power board. The high-brightness LED emits light, which is first homogenized by a light-diffusing plate 16 or a diffuser plate, and then reaches the beam splitter placed at a 45-degree angle. The beam splitter reflects most of the light downwards, vertically illuminating the surface of the arc workpiece being inspected. The reflected light from the workpiece surface passes again through the beam splitter and the anti-reflection film 18 above it, entering the camera lens.

[0021] A linear light source 20 is mounted at the light outlet 15 via a mounting bracket 30 to provide linear light that illuminates the measured arc surface at a low angle. The linear light source 20 is rotatably mounted on the mounting bracket 30, which is connected to the housing 11, so that the linear light source 20 and the coaxial light source 10 are integrated into one unit and can simultaneously illuminate the measured arc surface.

[0022] The linear light source 20 mainly includes a lamp holder, a second light source 22, and a focusing rod 23. The lamp holder is a frame consisting of a heat dissipation base 21, protective plates 24 located at the front and rear of the base 21, and end caps 25 located at the left and right sides of the base 21. The lamp holder has an internal mounting groove with a linear opening. The second light source 22 and the focusing rod 23 are installed in the mounting groove. The second light source 22 is a high-brightness linear LED strip. The focusing rod 23 is located immediately in front of the LED strip and is made of optical-grade PMMA or PC material. Its cross-section is a semi-circular or semi-elliptical lens structure, which can focus the light emitted by the LED into a narrow and bright linear spot. A transparent acrylic cover 27 is installed in front of the focusing rod 23 to prevent dust and damage. Multiple cooling fans 26 are installed on the outer surface of the heat dissipation base 21 of the linear light source 20 for forced air cooling, ensuring stable operation of the linear light source 20 at high power.

[0023] In the design of integrating the linear light source 20 into the housing 11 of the coaxial light source 10: A rectangular slot 19 is provided on the front panel of the housing 11, and a mounting bracket 30 with a rectangular plate structure is fixed on the plug 25 on one side of the linear light source 20. The main body of the mounting bracket 30 is embedded in the rectangular slot 19. A pair of first connecting holes 101 are provided on the corresponding position of the rear panel of the housing 11.

[0024] Meanwhile, a second connecting hole 251 adapted to the first connecting hole 101 is provided on the opposite outer surface of the plug 25. The plug 25 on one side is fixedly connected to the mounting bracket 30. The mounting bracket 30 is provided with a third connecting hole 31 and an arc-shaped groove 32 that match the second connecting hole 251. The linear light source 20 can rotate relative to the mounting bracket 30 along the arc-shaped groove 32, so as to adjust the illumination angle of the linear light source 20 to better adapt to the use requirements of the detection light source. Meanwhile, preferably, a handle 33 is connected to the outside of the mounting bracket 30. When installing the two light sources together, the mounting bracket 30 with the linear light source 20 fixed in place is held by hand, so that one end of the linear light source 20 is inserted and pushed into the rectangular slot 19. The linear light source 20 is pushed in until the end face of the linear light source 20 fits against the inner wall of the housing 11, and the mounting bracket 30 is completely embedded in the rectangular slot 19. The fastening is completed by screwing through the first connecting hole 101 (through hole) and the second connecting hole 251 (threaded hole). The installation and disassembly are convenient, the structure is compact and stable, and it is easy to integrate into the existing vision inspection system.

[0025] In practical applications, inspectors can flexibly configure lighting schemes according to the material of the workpiece with curved surfaces and the type of defects to be inspected. For example, for overall appearance inspection, only the coaxial light source 10 can be turned on; for minor annular scratches, only the linear light source 20 can be turned on, using low-angle light to produce strong contrast; for comprehensive quality inspection, both light sources can be turned on simultaneously to take into account both the overall and local aspects, ensuring that no defects are missed.

[0026] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A combined light source for detecting defects on a circular arc surface, characterized in that, include: A coaxial light source includes a housing, a beam splitter, and a first light source. The housing has a detection port and a light output port on its upper and lower sides, respectively. The beam splitter is inclined between the detection port and the light output port. The light emitted from the first light source is guided by the beam splitter to provide illumination perpendicular to the normal direction of the measured arc surface. A linear light source is mounted at the light outlet via a mounting bracket to provide linear light that illuminates the measured arc surface at a low angle. The linear light source is rotatably mounted on the mounting bracket, which is connected to the housing, so that the linear light source and the coaxial light source are integrated into one unit and can simultaneously illuminate the measured arc surface.

2. The combined light source for detecting defects on an arc surface according to claim 1, characterized in that, The first light source is distributed at a 45° angle to the beam splitter and is disposed on the side plate of the housing. A light-diffusing plate is disposed parallel to the side of the first light source facing the beam splitter, and a heat sink is attached to the other side.

3. The combined light source for detecting defects on an arc surface according to claim 2, characterized in that, It also includes an anti-reflective film that covers the detection port.

4. The combined light source for detecting defects on an arc surface according to claim 3, characterized in that, A rectangular slot is provided on the front panel of the housing, and the main body of the mounting bracket is embedded in the rectangular slot. A pair of first connecting holes are provided on the corresponding position of the rear panel of the housing.

5. A combined light source for detecting defects on an arc surface according to claim 4, characterized in that, The linear light source includes a lamp holder, a second light source, and a focusing rod. The lamp holder has a mounting groove with a linear opening inside. The second light source and the focusing rod are installed in the mounting groove. The light from the second light source is focused by the focusing rod and then emitted through the linear opening.

6. A combined light source for detecting defects on an arc surface according to claim 5, characterized in that, The lamp holder includes a base for heat dissipation of the second light source, and protective plates located on the front and rear sides of the base and plugs located on the left and right sides of the base. A cooling fan is provided on the outer surface of the base.

7. A combined light source for detecting defects on an arc surface according to claim 6, characterized in that, The plug has a second connecting hole that matches the first connecting hole on its opposite outer surface. The plug on one side is fixedly connected to the mounting bracket. The mounting bracket has a third connecting hole that matches the second connecting hole and an arc-shaped groove. The linear light source can rotate relative to the mounting bracket along the arc-shaped groove.

8. A combined light source for detecting defects on an arc surface according to claim 7, characterized in that, A handle is fixedly installed on the outer side of the mounting bracket.

9. A combined light source for detecting defects on an arc surface according to claim 5, characterized in that, The focusing rod is an integral rod-shaped lens made of optical-grade PMMA or PC material; its cross-section is semi-circular or semi-elliptical.

10. A combined light source for detecting defects on an arc surface according to claim 1, characterized in that, The coaxial light source and the linear light source can be powered and controlled independently.

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