A highway bridge crack detection device

Abstract

This invention discloses a highway bridge crack detection device, comprising: a robotic arm, an optical detection unit mounted on the robotic arm, an auxiliary lighting module mounted on the optical detection unit, and an activation element for activating the auxiliary lighting module mounted on the optical detection unit; in this invention, the mounting columns, fixing columns, and inner lining of the optical detection unit form a stable mounting foundation, providing reliable mounting support for the industrial high-definition camera, light strip, and diffuse reflector, ensuring stable operation of each component; the polygonal honeycomb diffuse reflector can convert the light from the light strip into uniform diffuse reflected light, avoiding glare and overexposure, and improving the imaging quality of the industrial high-definition camera; the through slot design ensures circuit connectivity; and magnetic blocks one and two provide positioning and fixation for the auxiliary lighting module. The overall structure is compact and highly integrated, adapting to the high-altitude operation requirements of the robotic arm and effectively improving the accuracy of crack detection.

Description

Technical Field

[0001] This invention relates to the field of bridge inspection equipment technology, specifically a crack detection device for highway bridges. Background Technology

[0002] Highway bridges are elevated structures built on highway routes, spanning rivers, valleys, highways, railways, structures, or other obstacles to allow continuous vehicle passage. Highway bridge crack detection refers to the entire process of acquiring images, measuring width, length, depth, morphological recognition, and condition determination of cracks and defects on the surface and inside the concrete structure of highway bridges, such as beams, webs, piers, cap beams, and bridge deck pavement, using non-contact optical measurement and other methods. The purpose is to promptly detect structural damage, assess the safety status of bridges, guide maintenance and repair, and ensure the safety of highway traffic.

[0003] When existing highway bridge crack detection equipment is used, the detection scenarios are mostly in the open environment of highways, which are easily affected by external factors such as natural light, backlight, and strong light. The illumination light often has insufficient uniformity, which can easily cause glare and overexposure. This lighting defect can cause bright spots, shadows, or white images on the surface of bridge concrete cracks, making it impossible to clearly show the edges, shape, and details of the cracks. This affects the accuracy of measuring key parameters such as crack width and length, which is not conducive to the accurate determination of bridge crack defects and the assessment of bridge safety status. Summary of the Invention

[0004] The purpose of this invention is to address the problem that existing highway bridge crack detection equipment often suffers from insufficient uniformity in illumination due to the fact that the detection scenarios are mostly in the open environment of highways, which are easily affected by external factors such as natural light, backlight, and strong light. This can lead to problems such as glare and overexposure, resulting in bright spots, shadows, or washed-out images on the surface of bridge concrete cracks. These defects make it impossible to clearly present the edges, shapes, and details of the cracks, thus affecting the accuracy of key parameters such as crack width and length measurements. This hinders the accurate determination of bridge crack defects and the assessment of bridge safety status. Therefore, this invention provides a highway bridge crack detection device.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a highway bridge crack detection device, comprising: a robotic arm, an optical detection unit mounted on the robotic arm, an auxiliary lighting module mounted on the optical detection unit, and an activation element for activating the auxiliary lighting module mounted on the optical detection unit;

[0006] The optical detection unit includes a mounting post fixedly connected to a robotic arm. A mounting cavity is formed on the end face of the mounting post away from the robotic arm. The mounting cavity is hemispherical. A fixing post is fixedly connected to the end face of the mounting post on one side of the mounting cavity. The bottom end of the fixing post is flush with the outer surface of the mounting post. The top end of the fixing post penetrates the mounting post and extends into the mounting cavity. An inner liner is fixedly connected to the top end of the fixing post. The inner liner is hemispherical, and a cavity is formed in the plane of the hemispherical inner liner. A mounting frame is fixedly connected to the bottom end of the cavity. An industrial high-definition camera is fixedly mounted on the mounting frame. A light strip is fixedly connected to the inside of the cavity, and the light strip is located on the plane of the mounting frame away from the inner liner. A diffuse reflector is embedded in the inside of the cavity, located on the plane of the light strip away from the inner liner. The diffuse reflector has a polygonal honeycomb structure.

[0007] As a further embodiment of the present invention: a through groove is provided through the inner side of the cavity, the through groove is located on the side of the mounting frame near the inner lining, and a through groove is also provided on the mounting column. The through groove on the inner lining and the through groove on the mounting column are aligned, so that the cavity, the mounting cavity and the outside of the mounting column are connected, so that the light strip and the camera can be connected to external devices. A magnetic block one is embedded in the inner side of the mounting cavity near the end face of the mounting column, and a magnetic block two is provided on the inner side of the inner lining near the inner lining plane and on the outer side of the inner lining. Two sets of magnetic blocks one and magnetic blocks two are provided, symmetrically distributed.

[0008] As a further embodiment of the present invention: the auxiliary lighting module includes a rotating disk fixedly connected to the outer circular surface of the fixed column, and a sliding block fixedly connected to the side end of the rotating disk. The sliding block is annular and surrounds the side end of the rotating disk. Multiple sets of rotating disks are arranged and evenly distributed between the mounting column and the inner lining. Adjacent sets of rotating disks are fitted together. The outer side of the outermost set of rotating disks is fitted with the inner side of the mounting cavity, and the inner side of the innermost set of rotating disks is fitted with the outer side of the inner lining. The diameter of the multiple sets of rotating disks decreases gradually from the outside to the inside.

[0009] As a further embodiment of the present invention: each set of rotating disks is provided with a through groove, and multiple sets of through grooves and through grooves are connected. Each set of sliding blocks is rotatably connected with a set of transparent covers and a set of light-reducing covers. The multiple sets of transparent covers have the same transparency, and the multiple sets of light-reducing covers have different light-reducing degrees. The transparent covers and light-reducing covers are both hollow hemispheres, and the transparent covers and light-reducing covers have the same size.

[0010] As a further embodiment of the present invention: the end faces of the transparent cover and the light-reducing cover are fixedly connected and form a complete sphere with a set of rotating disks. Four sets of magnetic blocks are embedded at the connection of each set of transparent cover and light-reducing cover. The four sets of magnetic blocks are symmetrically distributed on the inner and outer sides of the connection between the transparent cover and the light-reducing cover. Magnetic blocks one, two, and three are on the same plane. The mounting post, the inner liner, and the multiple sets of transparent cover and light-reducing cover between the mounting post and the inner liner maintain a relatively static state under the magnetic adsorption of magnetic blocks one, two, and three.

[0011] As a further embodiment of the present invention: the activator includes a rotating cylinder, which is fixedly connected to the top of the corresponding transparent cover and the neutral density cover. Each set of transparent covers and neutral density covers has a set of rotating cylinders at the top. The diameters and lengths of the multiple sets of rotating cylinders are different. The rotating cylinders corresponding to the innermost transparent cover and the neutral density cover have the smallest diameter and the longest length. The diameters of the remaining rotating cylinders increase sequentially from the inside to the outside, and the lengths decrease sequentially. The longest rotating cylinder is inserted into the next longest rotating cylinder and rotates with it. The remaining adjacent rotating cylinders are connected sequentially in the same nested rotation manner.

[0012] As a further embodiment of the present invention: the multiple sets of rotating cylinders all extend to the outside of the mounting column, and a set of gears is fixedly connected to the outer circular surface of each set of mounting columns. The multiple sets of gears have the same specifications, only the inner diameter of the connection is different.

[0013] As a further embodiment of the present invention: a hydraulic rod is fixedly connected to the top of the mounting column, a connecting plate is fixedly connected to the top of the hydraulic rod, the connecting plate is Z-shaped, and the hydraulic rod is located at the top inner side of the Z-shaped connecting plate. A motor is fixedly connected to the bottom outer side of the Z-shaped connecting plate, and a gear two is fixedly connected to the output end of the motor through the connecting plate. The gear two is located below the connecting plate and meshes with a set of gears.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. In this invention, the mounting column, fixing column, and inner lining of the optical detection unit form a stable mounting base, providing reliable mounting support for the industrial high-definition camera, light strip, and diffuse reflector, ensuring stable operation of each component. The polygonal honeycomb diffuse reflector can convert the light from the light strip into uniform diffuse reflected light, avoiding glare and overexposure, and improving the imaging quality of the industrial high-definition camera. The through slot ensures the continuity of the circuit. Magnetic block one and magnetic block two provide positioning and fixation for the auxiliary lighting module. The overall structure is compact and highly integrated, adapting to the high-altitude operation requirements of robotic arms and effectively improving the accuracy of crack detection.

[0016] 2. In this invention, multiple rotating disks and sliding blocks of the auxiliary lighting module enable flexible rotation and stable installation of the transparent cover and the light-reducing cover. Multiple light-reducing covers with different light-reducing degrees can be flexibly switched according to the ambient light to adapt to different detection scenarios. This solves the problems of traditional lighting modules having non-adjustable brightness and being easily interfered with by ambient light. The magnetic cooperation between magnetic block three and magnetic blocks one and two ensures that each component is relatively stationary, avoiding component shaking during the detection process. The connection between the slot and the through slot ensures smooth circuit. The overall structural design is reasonable, improving the practicality and adaptability of the equipment.

[0017] 3. In this invention, multiple nested rotating cylinders of the activator enable independent rotation of each transparent cover and neutral density cover, avoiding mutual interference. The cooperation of gear one, hydraulic rod, motor and gear two enables rapid and precise switching between the neutral density cover and the transparent cover. The operation is convenient and highly automated, requiring no manual adjustment, thus reducing the workload of workers. The gradient design of the rotating cylinder ensures the stability and rotational flexibility of the nested connection. The overall structure is reliable and can quickly respond to detection needs, further improving the efficiency and convenience of crack detection. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a cross-sectional view of the mounting column in this invention;

[0020] Figure 3 This is a schematic diagram of the optical detection unit in this invention;

[0021] Figure 4 This is a schematic diagram of the auxiliary lighting module in this invention;

[0022] Figure 5 In this invention Figure 4 A schematic diagram of the structure at point A;

[0023] Figure 6 This is a schematic diagram of the structure of the light-reducing mask in this invention;

[0024] Figure 7 This is a schematic diagram of the rotating cylinder in this invention;

[0025] Figure 8 This is a schematic diagram of the connecting plate in this invention.

[0026] In the diagram: 1. Robotic arm; 2. Optical detection unit; 21. Mounting column; 22. Mounting cavity; 23. Fixing column; 24. Liner; 25. Mounting bracket; 26. Camera; 27. Light strip; 28. Diffuse reflector; 29. ​​Through slot; 210. Magnetic block one; 211. Magnetic block two; 3. Auxiliary lighting module; 31. Rotating disk; 32. Sliding block; 33. Transparent cover; 34. Neutral density cover; 35. Through slot; 36. Magnetic block three; 4. Activation component; 41. Rotating cylinder; 42. Gear one; 43. Hydraulic rod; 44. Connecting plate; 45. Motor; 46. Gear two. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0029] Reference Figures 1 to 2 In this embodiment of the invention, a highway bridge crack detection device includes: a robotic arm 1, an optical detection unit 2 mounted on the robotic arm 1, an auxiliary lighting module 3 mounted on the optical detection unit 2, and an activation element 4 for activating the auxiliary lighting module 3 mounted on the optical detection unit 2.

[0030] Reference Figure 3The optical detection unit 2 includes a mounting post 21 fixedly connected to the robotic arm 1. A mounting cavity 22 is formed on the end face of the mounting post 21 away from the robotic arm 1. The mounting cavity 22 is hemispherical. A fixing post 23 is fixedly connected to the end face of the mounting post 21 located on one side of the mounting cavity 22. The bottom end of the fixing post 23 is flush with the outer surface of the mounting post 21. The top end of the fixing post 23 penetrates the mounting post 21 and extends into the mounting cavity 22. An inner liner 24 is fixedly connected to the top end of the fixing post 23. The inner liner 24 is hemispherical, and a cavity is formed in the plane of the hemispherical inner liner 24. A mounting frame 25 is fixedly connected to the bottom end of the cavity. An industrial high-definition camera 26 is fixedly mounted on the mounting frame 25. A light strip 27 is fixedly connected to the inside of the cavity, and the light strip 27 is located on the plane of the mounting frame 25 away from the inner liner 24. A diffuse reflector plate 28 is embedded in the inner side of the cavity. The diffuse reflector plate 28 is located on the side of the light strip 27 away from the inner liner 24. The diffuse reflector plate 28 has a polygonal honeycomb structure. A through groove 29 is opened through the inner side of the cavity. The through groove 29 is located on the side of the mounting bracket 25 near the inner liner 24. A through groove 29 is also opened on the mounting post 21. The through groove 29 on the inner liner 24 and the through groove 29 on the mounting post 21 are aligned, so that the cavity, the mounting cavity 22 and the outside of the mounting post 21 are connected, so that the light strip 27 and the camera 26 can be connected to external devices. A magnetic block 210 is embedded in the inner side of the mounting cavity 22 near the end face of the mounting post 21. A magnetic block 211 is provided on the inner side of the inner liner 24 near the plane of the inner liner 24 and on the outer side of the inner liner 24. Two sets of magnetic blocks 210 and magnetic blocks 211 are provided, which are symmetrically distributed.

[0031] The above scheme is adopted as follows: a hemispherical mounting cavity 22 is opened through the mounting column 21, and a hemispherical inner liner 24 is fixed with the fixing column 23 to achieve stable installation of the optical detection component. The industrial high-definition camera 26 is fixed through the mounting bracket 25, and the light strip 27 provides illumination. The polygonal honeycomb diffuse reflector 28 is used to achieve uniform diffuse reflection of light and avoid glare interference with imaging. The through groove 29 connects the cavity, mounting cavity 22 and the outside of the mounting column 21 to ensure stable connection between the light strip 27 and the camera 26 and external equipment. At the same time, the magnetic cooperation of magnetic block 1 210 and magnetic block 211 provides a positioning and fixing foundation for the subsequent installation of auxiliary lighting module 3, improving the stability of the overall structure and the ease of assembly.

[0032] Reference Figures 4 to 6The auxiliary lighting module 3 includes a rotating disk 31 fixedly connected to the outer circular surface of the fixed column 23. A sliding block 32 is fixedly connected to the side end of the rotating disk 31. The sliding block 32 is annular and surrounds the side end of the rotating disk 31. Multiple sets of rotating disks 31 are evenly distributed between the mounting column 21 and the inner liner 24. Adjacent sets of rotating disks 31 are in contact with each other. The outermost set of rotating disks 31 is in contact with the inner side of the mounting cavity 22, and the innermost set of rotating disks 31 is in contact with the outer side of the inner liner 24. The diameter of the multiple sets of rotating disks 31 decreases gradually from the outside to the inside. A through groove 35 is opened through each set of rotating disks 31. The multiple sets of through grooves 35 are connected to the through groove 29. A set of transparent covers 33 and a set of light-reducing covers 34 are rotatably connected to each set of sliding blocks 32. The multiple sets of transparent covers 33 have the same transparency, and the multiple sets of light-reducing covers 34 reduce light intensity. Depending on the degree of brightness, when the light strip 27 is too bright, a suitable set of light-reducing covers 34 can be selected to reduce the brightness. Both the transparent cover 33 and the light-reducing cover 34 are hollow hemispheres, and the transparent cover 33 and the light-reducing cover 34 are the same size. The end faces of the transparent cover 33 and the light-reducing cover 34 are fixedly connected and form a complete sphere with a set of rotating disks 31. Four sets of magnetic blocks 36 are embedded at the connection of each set of transparent cover 33 and light-reducing cover 34. The four sets of magnetic blocks 36 are symmetrically distributed on the inner and outer sides of the connection between the transparent cover 33 and the light-reducing cover 34. Magnetic block 1 210, magnetic block 211 and magnetic block 36 are on the same plane. The multiple sets of transparent cover 33 and light-reducing cover 34 between the mounting post 21, the inner liner 24 and the mounting post 21 and the inner liner 24 remain relatively stationary under the magnetic adsorption of magnetic block 1 210, magnetic block 211 and magnetic block 36.

[0033] The above scheme employs multiple sets of rotating disks 31 with progressively decreasing diameters from the outside to the inside, in conjunction with annular sliding blocks 32, to achieve stable installation and rotational support for the transparent cover 33 and the light-reducing cover 34. The close fit of the multiple sets of rotating disks 31 ensures the sealing of the mounting cavity 22. The connection between the through groove 35 and the through slot 29 ensures smooth wiring and does not affect component rotation. The combination of multiple light-reducing covers 34 with different light-reducing degrees with the transparent cover 33 allows for flexible adjustment of illumination brightness according to ambient light intensity, adapting to different detection scenarios. The magnetic attraction between magnetic block 36 and magnetic blocks 210 and 211 keeps the components relatively stationary, preventing component movement from affecting imaging accuracy during detection and facilitating subsequent switching of component rotation by the activation element 4.

[0034] Reference Figures 7 to 8The activator 4 includes a rotating cylinder 41, which is fixedly connected to the top of the corresponding transparent cover 33 and neutral density cover 34. Each set of transparent covers 33 and neutral density covers 34 has a corresponding set of rotating cylinders 41 at its top. The diameters and lengths of the multiple sets of rotating cylinders 41 are different. The rotating cylinder 41 corresponding to the innermost transparent cover 33 and neutral density cover 34 has the smallest diameter and the longest length. The diameters of the remaining rotating cylinders 41 increase sequentially from the inside out, while their lengths decrease sequentially. The longest rotating cylinder 41 is inserted into the next longest rotating cylinder 41 and rotates with it. The remaining adjacent rotating cylinders 41 are connected sequentially using the same nested rotation method. All sets of rotating cylinders 41 extend to the outside of the mounting post 21. Each circular surface is fixedly connected to a set of gears 42. Multiple sets of gears are of the same specification, only the inner diameter of the connection is different. A hydraulic rod 43 is fixedly connected to the top of the mounting column 21. A connecting plate 44 is fixedly connected to the top of the hydraulic rod 43. The connecting plate 44 is Z-shaped, and the hydraulic rod 43 is located at the top inner side of the Z-shaped connecting plate 44. A motor 45 is fixedly connected to the bottom outer side of the Z-shaped connecting plate 44. The output end of the motor 45 passes through the connecting plate 44 and is fixedly connected to a gear 46. The gear 46 is located below the connecting plate 44 and meshes with a set of gears 42. By driving the gear 46 to mesh with different gears 42 through the hydraulic rod 43, a selected set of transparent covers 33 and light-reducing covers 34 can be rotated, so that the light-reducing covers 34 are in front of the camera 26 to reduce the brightness.

[0035] The above scheme employs multiple nested rotating cylinders 41 to achieve independent rotation of each transparent cover 33 and neutral density cover 34. The gradient design of the diameter and length of the rotating cylinders 41 ensures the stability and rotational flexibility of the nested connection, avoiding mutual interference. Through gear 42 on the outer surface of the rotating cylinders 41, in conjunction with the hydraulic rod 43, connecting plate 44, motor 45, and gear 46, gear 46 meshes with different gears 42, thereby driving the selected transparent cover 33 and neutral density cover 34 to rotate. This enables rapid switching between the neutral density cover 34 and the transparent cover 33, making the operation convenient and precise. It can be flexibly adjusted according to the lighting requirements of the detection scene, improving detection efficiency and imaging quality.

[0036] The working principle of this invention is as follows: During inspection, the robotic arm 1 is first activated via an external control terminal. Based on the inspection requirements, the position and angle of the robotic arm 1 are adjusted to move the optical inspection unit 2 to the area of ​​the bridge to be inspected, ensuring that the industrial high-definition camera 26 is aligned with the area to be inspected, guaranteeing a clear field of view. Then, the light strip 27 in the optical inspection unit 2 is activated. The light emitted by the light strip 27 illuminates the polygonal honeycomb diffuse reflector plate 28. After diffuse reflection by the diffuse reflector plate 28, uniform, glare-free illumination light is formed, illuminating the concrete surface of the area to be inspected. This avoids excessively strong or dim light affecting crack imaging. Simultaneously, the industrial high-definition camera 26 is activated and begins acquiring image information of the area to be inspected. The image data is transmitted to the control terminal via the external devices connected through the through slot 29 and through the slot 35, facilitating observation and analysis by the staff. When the ambient light is strong and the light strip 27 is turned on, resulting in excessive brightness and overexposure, the staff activates the activation component 4 through the control terminal, controlling the extension and retraction of the hydraulic rod 43. The hydraulic rod 43 drives the connecting plate 44, motor 45, and gear 46 to move up and down, causing gear 46 to mesh with the corresponding gear 42. After meshing, the motor 45 is started, and the output end of the motor 45 drives gear 46 to rotate. Gear 46 drives the meshed gear 42 to rotate, and gear 42 drives the corresponding rotating cylinder 41 to rotate. The moving cylinder 41 drives the transparent cover 33 and the light-reducing cover 34, which are fixedly connected to it, to rotate synchronously until the light-reducing cover 34 is rotated in front of the industrial high-definition camera 26. Based on the ambient light intensity, the light-reducing cover 34 is selected with an appropriate degree of light reduction to weaken the light, ensuring that the crack image captured by the industrial high-definition camera 26 is clear and distortion-free. If the ambient light is weak and no light reduction is needed, the same operation is performed to control the activator 4 to rotate the transparent cover 33 and the light-reducing cover 34, rotating the transparent cover 33 in front of the industrial high-definition camera 26, ensuring that the light from the light strip 27 can fully illuminate the area to be inspected, providing sufficient lighting support for the industrial high-definition camera 26. During the inspection process, the magnetic block 2... 10. Magnetic block 211 and magnetic block 36 always maintain a magnetic adsorption state, keeping components such as mounting column 21, inner lining 24, rotating disk 31, transparent cover 33 and light-reducing cover 34 relatively stationary, preventing the robotic arm 1 from shaking or the components from shifting during equipment operation, and ensuring detection accuracy. When it is necessary to detect cracks in different parts of the bridge, the position and angle of the optical detection unit 2 are adjusted by controlling the robotic arm 1, and the above operation is repeated to complete the crack detection in each area in sequence. During the detection process, the crack image data collected by the industrial high-definition camera 26 is transmitted to the control terminal in real time. The staff can analyze the parameters such as the width, length and shape of the crack through the terminal to complete the crack detection operation.The mounting posts 21, fixing posts 23, and inner liner 24 of the optical detection unit 2 form a stable mounting base, providing reliable mounting support for the industrial high-definition camera 26, light strip 27, and diffuse reflector 28, ensuring stable operation of each component. The polygonal honeycomb diffuse reflector 28 can convert the light from the light strip 27 into uniform diffuse reflected light, avoiding glare and overexposure, and improving the imaging quality of the industrial high-definition camera 26. The through slot 29 ensures circuit connectivity. Magnetic block 1 210 and magnetic block 211 provide positioning and fixation for the auxiliary lighting module 3. The overall structure is compact and highly integrated, adapting to the high-altitude operation requirements of the robotic arm 1, effectively improving the accuracy of crack detection. Through multiple sets of rotating disks 31 and sliding blocks 32 of the auxiliary lighting module 3, the transparent cover 33 and the light-reducing cover 34 can be flexibly rotated and stably installed. Multiple light-reducing covers 34 with different light-reducing degrees can be flexibly switched according to the ambient light, adapting to different detection scenarios and solving the problem of... Traditional lighting modules suffer from limitations such as fixed brightness and susceptibility to ambient light interference. The magnetic cooperation between magnetic block 36, magnetic block 1 (210), and magnetic block 2 (211) ensures relative stillness of all components, preventing movement during inspection. The connection between slot 35 and through slot 29 ensures smooth circuitry. The overall structural design is rational, enhancing the equipment's practicality and adaptability. Multiple nested rotating cylinders 41 of the activation element 4 allow independent rotation of each transparent cover 33 and neutral density cover 34, preventing interference. The cooperation of gear 1 (42), hydraulic rod 43, motor 45, and gear 2 (46) enables rapid and precise switching between the neutral density cover 34 and the transparent cover 33. Operation is convenient and highly automated, eliminating the need for manual adjustments and reducing worker workload. The gradient design of the rotating cylinder 41 ensures the stability and rotational flexibility of the nested connection. The overall structure is reliable and can quickly respond to inspection needs, further improving the efficiency and convenience of crack detection.

[0037] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A crack detection device for highway bridges, comprising: A robotic arm (1) is characterized in that an optical detection unit (2) is provided on the robotic arm (1), an auxiliary lighting module (3) is provided on the optical detection unit (2), and an activation element (4) for activating the auxiliary lighting module (3) is provided on the optical detection unit (2). The optical detection unit (2) includes a mounting post (21) fixedly connected to the robotic arm (1). The mounting post (21) has a mounting cavity (22) on the end face away from the robotic arm (1). The mounting cavity (22) is hemispherical. A fixing post (23) is fixedly connected to the end face of the mounting post (21) on one side of the mounting cavity (22). The bottom end of the fixing post (23) is flush with the outer circular surface of the mounting post (21). The top end of the fixing post (23) penetrates the mounting post (21) and extends into the mounting cavity (22). An inner liner (24) is fixedly connected to the top end of the fixing post (23). The inner liner (24) is hemispherical, and a cavity is provided in the plane of the hemispherical inner liner (24). A mounting bracket (25) is fixedly connected to the bottom of the cavity. An industrial high-definition camera (26) is fixedly installed on the mounting bracket (25). A light strip (27) is fixedly connected to the inner side of the cavity, and the light strip (27) is located on the side of the mounting bracket (25) away from the inner liner (24). A diffuse reflector plate (28) is embedded in the inner side of the cavity. The diffuse reflector plate (28) is located on the side of the light strip (27) away from the inner liner (24). The diffuse reflector plate (28) has a polygonal honeycomb structure.

2. The highway bridge crack detection equipment according to claim 1, characterized in that, A through groove (29) is provided through the inner side of the cavity. The through groove (29) is located on the side of the mounting frame (25) near the inner liner (24). A through groove (29) is also provided on the mounting column (21). The through groove (29) on the inner liner (24) and the through groove (29) on the mounting column (21) are aligned so that the cavity, the mounting cavity (22) and the outside of the mounting column (21) are connected, so that the light strip (27) and the camera (26) can be connected to external devices. A magnetic block one (210) is embedded in the inner side of the mounting cavity (22) near the end face of the mounting column (21). A magnetic block two (211) is provided in the inner side of the inner liner (24) near the plane of the inner liner (24) and on the outer side of the inner liner (24). There are two sets of magnetic blocks one (210) and magnetic blocks two (211), which are symmetrically distributed.

3. The highway bridge crack detection equipment according to claim 2, characterized in that, The auxiliary lighting module (3) includes a rotating disk (31) fixedly connected to the outer circular surface of the fixed column (23). A sliding block (32) is fixedly connected to the side end of the rotating disk (31). The sliding block (32) is annular and surrounds the side end of the rotating disk (31). There are multiple sets of rotating disks (31) evenly distributed between the mounting column (21) and the inner liner (24). Adjacent sets of rotating disks (31) are fitted together. The outer side of the outermost set of rotating disks (31) is fitted with the inner side of the mounting cavity (22), and the inner side of the innermost set of rotating disks (31) is fitted with the outer side of the inner liner (24). The diameter of the multiple sets of rotating disks (31) decreases gradually from the outside to the inside.

4. The highway bridge crack detection equipment according to claim 3, characterized in that, Each set of rotating disks (31) has a through groove (35) through it. Multiple sets of through grooves (35) and through grooves (29) are connected. Each set of sliding blocks (32) is rotatably connected to a set of transparent covers (33) and a set of light-reducing covers (34). Multiple sets of transparent covers (33) have the same transparency, and multiple sets of light-reducing covers (34) have different light-reducing degrees. The transparent covers (33) and light-reducing covers (34) are both hollow hemispheres, and the transparent covers (33) and light-reducing covers (34) have the same size.

5. The highway bridge crack detection equipment according to claim 4, characterized in that, The transparent cover (33) and the light-reducing cover (34) are fixedly connected at their ends and form a complete sphere with a set of rotating disks (31). Four sets of magnetic blocks (36) are embedded at the connection of each set of transparent cover (33) and light-reducing cover (34). The four sets of magnetic blocks (36) are symmetrically distributed on the inner and outer sides of the connection between the transparent cover (33) and the light-reducing cover (34). Magnetic block one (210), magnetic block two (211) and magnetic block three (36) are on the same plane. The multiple sets of transparent cover (33) and light-reducing cover (34) between the mounting post (21), the inner liner (24) and the mounting post (21) and the inner liner (24) remain relatively stationary under the magnetic adsorption of magnetic block one (210), magnetic block two (211) and magnetic block three (36).

6. The highway bridge crack detection equipment according to claim 5, characterized in that, The activation element (4) includes a rotating cylinder (41), which is fixedly connected to the top of the corresponding transparent cover (33) and light-reducing cover (34). Each set of transparent cover (33) and light-reducing cover (34) has a set of rotating cylinders (41) at the top. The diameter and length of the multiple sets of rotating cylinders (41) are different. The rotating cylinder (41) corresponding to the innermost transparent cover (33) and light-reducing cover (34) has the smallest diameter and the longest length. The diameter of the remaining rotating cylinders (41) increases from the inside to the outside, and the length decreases from the inside to the outside. The longest rotating cylinder (41) is inserted into the next longest rotating cylinder (41) and rotates with it. The remaining adjacent rotating cylinders (41) are connected in sequence by the same nested rotation method.

7. The highway bridge crack detection equipment according to claim 6, characterized in that, The multiple sets of rotating cylinders (41) all extend to the outside of the mounting column (21). Each set of mounting column (21) has a set of gears (42) fixedly connected to its outer surface. The multiple sets of gears have the same specifications, only the inner diameter of the connection is different.

8. The highway bridge crack detection equipment according to claim 7, characterized in that, A hydraulic rod (43) is fixedly connected to the top of the mounting column (21). A connecting plate (44) is fixedly connected to the top of the hydraulic rod (43). The connecting plate (44) is Z-shaped, and the hydraulic rod (43) is located at the top of the inner side of the Z-shaped connecting plate (44). A motor (45) is fixedly connected to the bottom of the outer side of the Z-shaped connecting plate (44). The output end of the motor (45) passes through the connecting plate (44) and is fixedly connected to a gear two (46). The gear two (46) is located below the connecting plate (44) and meshes with a set of gear one (42).

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