Bridge construction concrete crack optical detector

Abstract

This invention relates to the field of visual inspection technology and discloses an optical detector for concrete cracks in bridge and road construction. The detector includes a drone and a detector mounted on the side of the drone. A rotating shaft is rotatably mounted inside the detector, with a climbing wheel installed at the end of the shaft. A cleaning brush is mounted on the side of the detector, and a first drive assembly is positioned between the cleaning brush and the rotating shaft. A dust collection box is also located on the side of the detector, and a second drive assembly is positioned between the dust collection box and the first drive assembly. A column is mounted on the outside of the detector, and a lens is mounted on the outside of the column. A light-shielding plate is also rotatably mounted on the side of the column. The cleaning brush removes dust covering the cracks, exposing complete and clear cracks. The brightness of the light captured by the lens is controlled by the rotation of the light-shielding plate, ensuring that the lens captures clear and complete images of the cracks, thereby improving the accuracy of concrete crack detection.

Description

Technical Field

[0001] This invention relates to the field of visual inspection technology, and more specifically, to an optical detector for detecting concrete cracks in bridge and road construction. Background Technology

[0002] The commonly used optical detector for concrete cracks in bridge and road construction is the long-distance crack observation instrument. It uses non-contact optical imaging technology to capture images of cracks from a distance and measure parameters such as their width and length. It is an important tool for detecting concrete cracks in bridge and road construction.

[0003] Non-contact inspection eliminates the need for climbing or using scaffolding or other auxiliary facilities. Utilizing a high-precision optical lens, it images bridge and road concrete structures to detect cracks, analyzing their length and width. This allows for remote observation and measurement, improving efficiency and safety. The detection accuracy reaches ±0.02mm, meeting the precision requirements for crack detection in bridge and road construction. Working distances typically range from several meters to tens of meters, with some models reaching up to 200 meters, suitable for inspection needs in bridge and road construction of varying scales. Some models are equipped with professional image processing software that automatically calculates crack width, length, and area, generating inspection reports. Other models support automatic re-inspection and over-limit alarm functions. The portable design supports wireless remote control operation for convenient on-site use. The integrated high-precision optical system... The system, consisting of a lens, CCD sensor, and illumination unit, enables angle compensation and image analysis. It detects and monitors cracks by capturing visual images. Image processing software preprocesses the captured crack images, including image enhancement and grayscale correction. Then, an image segmentation algorithm automatically identifies and extracts crack features, calculating parameters such as crack width and length. The system integrates precision angle and distance measurement sensors to acquire observation angle and distance information in real time. It automatically calibrates the system magnification and calculates spatial coordinates, ensuring accuracy at different angles and distances. Furthermore, drones equipped with detectors can be used to form a climbing robot that crawls on sloping or vertical concrete surfaces of bridges and roads, allowing the detection lens to perform close-range crack detection, further improving accuracy.

[0004] Currently, existing technologies using climbing robots to detect cracks in vertical bridge and road concrete structures involve controlling the robot to climb along the concrete slope so that the detection lens can capture close-up images of the cracks. However, the surface of bridge and road concrete structures is often covered with dust and other dirt, which obscures the cracks and easily interferes with the clarity of the images captured, thus affecting the accuracy of crack detection. Therefore, this technology does not meet the current requirements. To address this, we propose an optical detector for concrete cracks in bridge and road construction. Summary of the Invention

[0005] This invention provides an optical detector for concrete cracks in bridge and road construction. This detector can remove dust and other stains adhering to the surface of concrete structures in bridge and road construction, fully exposing the cracks and improving the clarity of the crack images. This improves the accuracy of crack detection and solves the problem mentioned in the background art that the surface of concrete structures in bridge and road construction is often covered by dust and other stains, which obscures the cracks and easily interferes with the clarity of the crack images, thus affecting the accuracy of crack detection.

[0006] To achieve the above objectives, this disclosure provides an optical detector for concrete cracks in bridge and road construction, including a drone and a detector mounted on the side of the drone. A rotating shaft is rotatably mounted inside the detector, and a climbing wheel is installed at the end of the rotating shaft. A cleaning brush is mounted on the side of the detector, and a first driving assembly is disposed between the cleaning brush and the rotating shaft. A dust collection box is also disposed on the side of the detector, and a second driving assembly is disposed between the dust collection box and the first driving assembly. A column is mounted on the outside of the detector, and a lens is mounted on the outside of the column. A light-shielding plate is also rotatably mounted on the side of the column. The drone carries the detector to the upper end of a concrete slope, causing the climbing wheel to move downwards along the slope. During this movement, the cleaning brush removes dust into the dust collection box, and the lens then captures images of the cracks for detection, thereby improving detection accuracy.

[0007] Optionally, the number of the rotating shafts is set to two, and the climbing wheels are installed at both ends of the two rotating shafts. The climbing wheels are used to climb close to the concrete building slope.

[0008] Optionally, the first drive assembly includes a first bevel gear sleeved in the middle of one of the rotating shafts, a first shaft rotatably disposed inside the detector, and a second bevel gear mounted on one end of the first shaft.

[0009] Optionally, the second bevel gear meshes with the first bevel gear, and the cleaning brush is mounted on the other end of the first shaft, with the bristles of the cleaning brush adhering closely to the surface of the bridge and road concrete structure.

[0010] Optionally, triangular blocks are installed on the inner wall of the dust collection box.

[0011] Optionally, the second drive assembly includes a housing connected to the outside of the dust collection box, a second shaft rotatably disposed inside the housing, a third bevel gear mounted on one end of the second shaft and meshing with the first bevel gear, a turbine sleeved on the other end of the second shaft, a filter sheet disposed inside the housing, and an air hole opened on the side of the housing.

[0012] Optionally, the second shaft is located within both the housing and the dust collection box, the turbine is located within the housing, the outer side of the filter is attached to the inner wall of the housing, and the filter is mounted on the inner wall of the housing. The filter separates the dust collection box and the housing into two cavities, and the interior of the housing communicates with the outside air through the air vent.

[0013] Optionally, a fixed shaft is installed on the outside of the column, the light shield is rotatably inserted into the side of the fixed shaft, and a micro motor is installed on the outside of the detector, the output shaft of the micro motor is connected to the light shield.

[0014] Optionally, a first wedge block is slidably disposed on the inner side of the light-shielding plate, and a spring is disposed on the inner side of the light-shielding plate. The two ends of the spring are respectively connected to the first wedge block and the inner wall of the light-shielding plate. A traction rope is installed on the outer side of the first wedge block, and the end of the traction rope is connected to the fixed shaft. A second wedge block that cooperates with the first wedge block is slidably disposed on the inner side of the light-shielding plate. An mounting piece that is connected to the second wedge block is also slidably disposed on the inner side of the light-shielding plate. A cleaning sponge is installed on the outer side of the mounting piece.

[0015] Optionally, a third wedge block connected to the mounting plate is slidably disposed on the inner side of the light-shielding plate, and a connecting plate is installed on the outer side of the third wedge block. A fourth wedge block that cooperates with the third wedge block is slidably disposed on the inner side of the light-shielding plate, and a contact plane is provided at one end of the fourth wedge block. The side wall of the light-shielding plate has an opening for use with the cleaning sponge, and a baffle for covering the opening is slidably provided on the side wall of the light-shielding plate. A connecting rod is installed on the outside of the baffle, and the end of the connecting rod is connected to the fourth wedge block.

[0016] With the above technical solution, the optical detector for concrete cracks in bridge and road construction provided in this disclosure is used as follows: First, a drone carrying the detector is moved to the upper end of the concrete building slope, so that the climbing wheel moves down the slope. During the movement, the dust covering the crack is cleaned by the cleaning brush, exposing the complete and clear crack. Then, the brightness of the light captured by the lens is controlled by the rotation of the light shield, so that the lens can capture a clear and complete crack, thereby improving the accuracy of concrete crack detection.

[0017] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the detector of the present invention.

[0020] Figure 3 This is a schematic diagram of the internal three-dimensional structure of the detector of the present invention.

[0021] Figure 4 This is a schematic diagram of the three-dimensional structure of the cleaning brush of the present invention.

[0022] Figure 5 This is a cross-sectional structural diagram of the second driving component of the present invention.

[0023] Figure 6 This is an exploded view of the second driving component of the present invention.

[0024] Figure 7 This is a schematic diagram of the three-dimensional structure of the column of the present invention.

[0025] Figure 8 This is a schematic diagram of the internal three-dimensional structure of the light-shielding plate of the present invention.

[0026] Figure 9 This is a partial exploded view of the present invention.

[0027] Figure 10 This is a schematic diagram of the cross-sectional structure of the light-shielding plate of the present invention.

[0028] Explanation of reference numerals in the attached drawings: 100, UAV; 110, detector; 120, shaft; 130, climbing wheel; 140, cleaning brush; 150, first drive assembly; 151, first bevel gear; 152, first shaft; 153, second bevel gear; 160, dust collection box; 161, triangular block; 170, second drive assembly; 171, housing; 172, second shaft; 173, third bevel gear; 174, turbine; 175, filter; 176. Air vent; 180. Column; 190. Lens; 200. Light shield; 210. Fixed shaft; 211. Miniature motor; 220. First wedge block; 221. Spring; 222. Traction rope; 223. Second wedge block; 224. Mounting plate; 225. Cleaning sponge; 230. Third wedge block; 231. Connecting plate; 232. Fourth wedge block; 233. Contact plane; 234. Opening; 235. Baffle; 236. Connecting rod. Detailed Implementation

[0029] To make the above-described objects, features, and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this disclosure. However, this disclosure can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this disclosure. Therefore, this disclosure is not limited to the specific embodiments disclosed below.

[0030] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this disclosure 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 disclosure. The terms "first" and "second" are used to distinguish one element from another and do not have sequential or importance. Furthermore, in the following description, when referring to the accompanying drawings, the same reference numerals in different drawings denote the same or similar elements, which will not be repeated here.

[0031] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0032] According to some embodiments of this disclosure, an optical detector for detecting concrete cracks in bridge and road construction is provided, with reference to... Figure 1 — Figure 10 As shown, the optical detector for concrete cracks in bridge and road construction includes a drone 100 and a detector 110 fixedly mounted on the side of the drone 100. A rotating shaft 120 is rotatably mounted inside the detector 110 via a drive mechanism. The drive mechanism for rotating the rotating shaft 120 can be a motor, which is a well-known technique in the art and will not be described in detail here. A climbing wheel 130 is installed at the end of the rotating shaft 120. There are two rotating shafts 120, and climbing wheels 130 are fixedly mounted at both ends of the two rotating shafts 120. The climbing wheels 130 are used to climb close to the concrete building slope.

[0033] A cleaning brush 140 is provided on the side of the detector 110. A first drive assembly 150 is provided between the cleaning brush 140 and the rotating shaft 120. The first drive assembly 150 includes a first bevel gear 151 that is interference-fitted in the middle of one of the rotating shafts 120, a first shaft 152 that is rotatably disposed inside the detector 110 via a bearing, and a second bevel gear 153 that is fixedly installed at one end of the first shaft 152. The second bevel gear 153 meshes with the first bevel gear 151. The cleaning brush 140 is fixedly installed at the other end of the first shaft 152. The bristles of the cleaning brush 140 are in close contact with the surface of the bridge and road concrete structure, and the bristles of the cleaning brush 140 apply a certain pressure to the surface of the bridge and road concrete structure, which facilitates the cleaning of dust and other stains attached to the surface.

[0034] The detector 110 is also provided with a dust collection box 160 on its side. A triangular block 161 is installed on the inner wall of the dust collection box 160. The two ends of the triangular block 161 are fixedly connected to the inner walls on both sides of the dust collection box 160. Dust slides down the inclined surface of the triangular block 161 into the inner cavity of the dust collection box 160. The triangular block 161 is also designed to minimize the problem of dust collected inside the dust collection box 160 spilling out when it is placed horizontally.

[0035] A second drive assembly 170 is disposed between the dust collection box 160 and the first drive assembly 150. The second drive assembly 170 includes a housing 171 fixedly connected to the outside of the dust collection box 160, a second shaft 172 rotatably disposed inside the housing 171 via a bearing, a third bevel gear 173 fixedly mounted on one end of the second shaft 172 and meshing with the first bevel gear 151, a turbine 174 interference-fitted to the other end of the second shaft 172, a filter sheet 175 fixedly disposed inside the housing 171, and an opening The air vent 176 on the side of the housing 171 and the second shaft 172 are located together inside the housing 171 and the dust collection box 160. The turbine 174 is located inside the housing 171. The outer side of the filter 175 is attached to the inner wall of the housing 171, and the filter 175 is fixedly installed on the inner wall of the housing 171. The filter 175 separates the dust collection box 160 and the housing 171 into two cavities to prevent dust and other debris from entering the housing 171 and damaging the turbine 174. The interior of the housing 171 is connected to the outside air through the air vent 176.

[0036] A column 180 is fixedly mounted on the outside of the detector 110, and a lens 190 is fixedly mounted on the outside of the column 180. A light shield 200 is also rotatably mounted on the side of the column 180. A fixed shaft 210 is fixedly mounted on the outside of the column 180, and the light shield 200 is rotatably inserted into the side of the fixed shaft 210. A micro motor 211 is fixedly mounted on the outside of the detector 110. The output shaft of the micro motor 211 is fixedly connected to the light shield 200. A first wedge block 220 is slidably mounted on the inside of the light shield 200, and a spring 221 is mounted on the inside of the light shield 200. The two ends of the spring 221 are respectively engaged with the first wedge block 220 and the inner wall of the light shield 200. When the spring 221 becomes fatigued due to long-term use and can no longer perform its function, it is convenient to replace the spring 221.

[0037] A traction rope 222 is fixedly installed on the outer side of the first wedge block 220. The middle part of the traction rope 222 is inserted into the side wall of the light shield 200 with a gap, and the end of the traction rope 222 is fixedly connected to the fixed shaft 210. A second wedge block 223 is slidably arranged on the inner side of the light shield 200 to cooperate with the first wedge block 220. The inclined surfaces of the first wedge block 220 and the second wedge block 223 are slidably engaged by a slider (not shown in the figure) and a groove (not shown in the figure) to prevent the first wedge block 220 and the second wedge block 223 from disengaging. An installation piece 224 is also slidably arranged on the inner side of the light shield 200 and fixedly connected to the second wedge block 223. A cleaning sponge 225 is fixedly installed on the outer side of the installation piece 224. The cleaning sponge 225 is used to wipe the lens 190 to prevent dust and other debris from falling on the lens 190 and interfering with the lens 190's imaging and detection of cracks.

[0038] A third wedge block 230, which is fixedly connected to the mounting plate 224, is slidably disposed on the inner side of the light-shielding plate 200. A connecting plate 231 is fixedly installed on the outer side of the third wedge block 230. A fourth wedge block 232, which cooperates with the third wedge block 230, is slidably disposed on the inner side of the light-shielding plate 200. The inclined surfaces of the third wedge block 230 and the fourth wedge block 232 are also slidably engaged by a slider (not shown in the figure) and a groove (not shown in the figure) to prevent the third wedge block 230 and the fourth wedge block 232 from disengaging. One end of the fourth wedge block 232 is provided with a contact surface 233, which slidably engages with the connecting plate 231 to block light. The side wall of the plate 200 has an opening 234 for use with the cleaning sponge 225. The side wall of the light shield 200 is slidably provided with a baffle 235 for covering the opening 234. A connecting rod 236 is fixedly installed on the outside of the baffle 235. The end of the connecting rod 236 is fixedly connected to the fourth wedge block 232. First, the drone 100 carries the detector 110 to the upper end of the concrete building slope, so that the climbing wheel 130 moves down the slope. During the movement, the dust cleaning brush 140 falls into the dust collection box 160 through the cleaning brush 140. Then, the lens 190 is used to photograph and detect the cracks, thereby improving the detection accuracy.

[0039] With the above technical solution, the optical detector for concrete cracks in bridge and road construction provided in this disclosure is used by first moving the detector 110 to the upper end of the concrete building slope via a drone 100, so that the climbing wheel 130 moves down the slope. During the downward movement of the detector 110, the cleaning brush 140 and the dust collection box 160 slide along the concrete surface. The rotating shaft 120 drives the climbing wheel 130 to rotate, and the rotating shaft 120 also drives the first bevel gear 151 to rotate. Through the meshing of the first bevel gear 151 and the second bevel gear 153, the second bevel gear 153 drives the first shaft 152 and the cleaning brush 140 to rotate, thereby brushing off the dust attached to the concrete surface, and thus completely and clearly exposing the cracks on the concrete. The brushed-off dust falls naturally into the dust collection box 160 located below the cleaning brush 140 under its own gravity. At the same time, through the meshing of the first bevel gear 151 and the third bevel gear 173, the third bevel gear 173 drives the turbine 174 to rotate through the second shaft 172. The rotating turbine 174 discharges the air in the dust collection box 160 to the outside through the air hole 176, thereby generating suction at the opening of the dust collection box 160, further sucking the dust into the dust collection box 160 and preventing the dust brushed off from being stirred up and interfering with the shooting and detection of the lens 190. In low-light conditions, the micro motor 211 drives the light-shielding plate 200 to rotate counterclockwise, moving the light-shielding plate 200 away from the lens 190. This ensures that the lens 190 captures bright and sufficient light, resulting in a clear and complete image of the crack. In high-light conditions, the micro motor 211 drives the light-shielding plate 200 to rotate clockwise, causing the light-shielding plate 200 to flip above the lens 190 and block some of the light, preventing blurring due to overexposure during shooting. This also ensures that the lens 190 captures a clear and complete image of the crack. When dust settles on the lens 190 and obstructs the shooting view, the micro motor 211 drives the light-shield 200 to continue rotating clockwise. This causes the cleaning sponge 225 inside the light-shield 200 to move closer to the lens 190. At this time, one end of the traction rope 222, which is fixedly connected to the outside of the fixed shaft 210, is wrapped around the fixed shaft 210. This causes the other end of the traction rope 222 to pull the first wedge block 220. Through the sliding engagement between the first wedge block 220 and the second wedge block 223, the second wedge block 223 causes the mounting plate 224 and the cleaning sponge 225 to move downwards and extend outwards from the light-shield 200. Simultaneously, the mounting plate 224 causes the third wedge block 230 to move downwards. Through the sliding engagement between the third wedge block 230 and the fourth wedge block 232, the fourth wedge block 232 causes the baffle 235 to move via the connecting rod 236, thereby opening the opening. The opening 234 is exposed, allowing the cleaning sponge 225 to extend outward from the opening 234, thus allowing the cleaning sponge 225 to adhere tightly to the lens 190 for wiping and cleaning. This prevents dust on the lens 190 from obstructing the shooting view. After wiping, the light shield 200 is reversed and reset, causing the cleaning sponge 225 to retract back into the light shield 200. The baffle 235 then covers the opening 234 again, preventing dust and other environmental contaminants from entering the light shield 200 and contaminating the cleaning sponge 225. In summary, by cleaning the dust covering the crack with the cleaning brush 140, a complete and clear crack is exposed. The brightness of the light captured by the lens 190 is controlled by the rotation of the light shield 200, allowing the lens 190 to capture a clear and complete crack, thereby improving the accuracy of concrete crack detection.

[0040] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0042] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. An optical detector for detecting concrete cracks in bridge and road construction, comprising a drone (100) and a detector (110) disposed on the side of the drone (100), characterized in that: A rotating shaft (120) is rotatably mounted inside the detector (110). A ramp wheel (130) is mounted at the end of the rotating shaft (120). A cleaning brush (140) is mounted on the side of the detector (110). A first drive assembly (150) is positioned between the cleaning brush (140) and the rotating shaft (120). A dust collection box (160) is also mounted on the side of the detector (110). A second drive assembly (170) is positioned between the dust collection box (160) and the first drive assembly (150). A [missing information - likely a device or component] is mounted on the outside of the detector (110). A column (180) is provided with a lens (190) installed on its outer side. A light shield (200) is also rotatably provided on the side of the column (180). The detector (110) is first moved to the upper end of the concrete building slope by the drone (100), so that the climbing wheel (130) moves down the slope. During the movement, the dust cleaning brush (140) is dropped into the dust collection box (160) by the cleaning brush (140). Then, the crack is photographed and detected by the lens (190), thereby improving the detection accuracy.

2. The optical detector for concrete cracks in bridge and road construction according to claim 1, characterized in that: The number of the rotating shafts (120) is set to two, and the climbing wheels (130) are installed at both ends of the two rotating shafts (120). The climbing wheels (130) are used to climb close to the concrete building slope.

3. The optical detector for concrete cracks in bridge and road construction according to claim 2, characterized in that: The first drive assembly (150) includes a first bevel gear (151) sleeved in the middle of one of the shafts (120), a first shaft (152) rotatably disposed inside the detector (110), and a second bevel gear (153) mounted on one end of the first shaft (152).

4. The optical detector for concrete cracks in bridge and road construction according to claim 3, characterized in that: The second bevel gear (153) meshes with the first bevel gear (151), and the cleaning brush (140) is installed at the other end of the first shaft (152). The bristles of the cleaning brush (140) are in close contact with the surface of the bridge concrete structure.

5. The optical detector for concrete cracks in bridge and road construction according to claim 1, characterized in that: The dust collection box (160) has a triangular block (161) installed on its inner wall.

6. The optical detector for concrete cracks in bridge and road construction according to claim 3, characterized in that: The second drive assembly (170) includes a housing (171) connected to the outside of the dust collection box (160), a second shaft (172) rotatably disposed inside the housing (171), a third bevel gear (173) mounted on one end of the second shaft (172) and meshing with the first bevel gear (151), a turbine (174) sleeved on the other end of the second shaft (172), a filter (175) disposed inside the housing (171), and an air hole (176) opened on the side of the housing (171).

7. The optical detector for concrete cracks in bridge and road construction according to claim 6, characterized in that: The second shaft (172) is located in both the housing (171) and the dust collection box (160). The turbine (174) is located in the housing (171). The outer side of the filter (175) is attached to the inner wall of the housing (171), and the filter (175) is installed on the inner wall of the housing (171). The filter (175) divides the dust collection box (160) and the housing (171) into two cavities. The interior of the housing (171) is connected to the outside air through the air hole (176).

8. The optical detector for concrete cracks in bridge and road construction according to claim 1, characterized in that: A fixed shaft (210) is installed on the outside of the column (180), and the light shield (200) is rotatably inserted into the side of the fixed shaft (210). A micro motor (211) is installed on the outside of the detector (110), and the output shaft of the micro motor (211) is connected to the light shield (200).

9. The optical detector for concrete cracks in bridge and road construction according to claim 8, characterized in that: A first wedge block (220) is slidably disposed on the inner side of the light-shielding plate (200). A spring (221) is disposed on the inner side of the light-shielding plate (200). The two ends of the spring (221) are respectively connected to the first wedge block (220) and the inner wall of the light-shielding plate (200). A traction rope (222) is installed on the outer side of the first wedge block (220). The end of the traction rope (222) is connected to the fixed shaft (210). A second wedge block (223) is slidably disposed on the inner side of the light-shielding plate (200) and used in conjunction with the first wedge block (220). An mounting piece (224) connected to the second wedge block (223) is also slidably disposed on the inner side of the light-shielding plate (200). A cleaning sponge (225) is installed on the outer side of the mounting piece (224).

10. The optical detector for concrete cracks in bridge and road construction according to claim 9, characterized in that: The light shield (200) has a third wedge block (230) slidably disposed on the inner side and connected to the mounting plate (224). A connecting plate (231) is installed on the outer side of the third wedge block (230). The light shield (200) has a fourth wedge block (232) slidably disposed on the inner side and used in conjunction with the third wedge block (230). One end of the fourth wedge block (232) is provided with a contact plane (233). The side wall of the light shield (200) is provided with an opening (234) for use with the cleaning sponge (225). A baffle (235) for covering the opening (234) is slidably provided on the side wall of the light shield (200). A connecting rod (236) is installed on the outside of the baffle (235). The end of the connecting rod (236) is connected to the fourth wedge block (232).

Images