Polarization binocular detection device for underwater concrete structure defects

Abstract

The invention provides a polarization binocular detection device for underwater concrete structure defects, which comprises a suspension lifting device, a movable plate, a transverse displacement device, a mounting frame, a polarization binocular underwater camera, a connecting rod driving device, a guide rail and a control mechanism, the transverse displacement device is used for driving the mounting frame to transversely move, the guide rail is fixedly mounted at the top of the movable plate, the polarized binocular underwater camera is rotationally mounted on the inner side of the mounting frame, the outer surface of the polarized binocular underwater camera is further sleeved with a waterproof protection cover, and a mirror cover and a control mechanism are arranged at the front end of the waterproof protection cover; compared with a traditional manual diver detection mode, the detection system with the higher automation degree has the advantages that the working efficiency can be remarkably improved, errors caused by human factors are reduced, and the detection accuracy is improved. And detection tasks in a larger range can be completed in a shorter time.

Description

Technical Field

[0001] The present invention relates to the field of concrete detection devices, and particularly to a polarized binocular detection device for defects in underwater concrete structures. Background Art

[0002] Concrete is one of the building materials with the largest usage amount and the widest application range in engineering construction in the world today. Nowadays, whether it is industrial buildings or civil buildings, or highways, water conservancy and hydropower projects, etc., concrete can be seen everywhere in these buildings. Its strength is closely related to the durability, safety and service life of the entire project, and it is of great significance to maintaining the normal operation and development and construction of society. In recent years, with the rapid development of China's economy and science and technology, the demand for infrastructure has also been increasing day by day. The quantity, scale and complexity of hydraulic engineering projects have increased significantly compared with before, and at the same time, the requirements for their quality and safety have also increased. With the rapid development of cities, in order to improve road traffic, urban road bridges will inevitably cross mountains and rivers. Due to being immersed in water all year round, the bridge piers are greatly affected by the water environment and the outside world, such as the impact of passing ships, and defects such as erosion, peeling and cracking of the outer surface of the concrete. In severe cases, the steel bars inside the concrete are exposed, which seriously affects the safety of the upper structure of the bridge.

[0003] At present, most of the inspections of underwater piers are carried out by divers going into the water for manual groping and using underwater cameras for appearance inspection. Its disadvantages include the following points: 1. The inspection work is all carried out manually, and the inspection results are greatly affected by the physical condition and operation level of the inspectors; 2. The inspection has a large randomness, poor repeatability, inaccurate result positioning, and obvious limitations; 3. It is greatly affected by the weather, and it is not suitable for long-term underwater operations considering safety.

[0004] Therefore, it is necessary to provide a new polarized binocular detection device for defects in underwater concrete structures to solve the above technical problems. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a polarized binocular detection device for defects in underwater concrete structures.

[0006] The polarization binocular detection device for underwater concrete structure defects provided by the present invention includes a suspension lifting device, a movable plate, a lateral displacement device, a mounting frame, a polarization binocular underwater camera, a link drive device, a guide rail and a control mechanism. The suspension lifting device is used to drive the movable plate to move up and down. The lateral displacement device is fixedly installed at the bottom of the movable plate, and the lateral displacement device is used to drive the mounting frame to move laterally. The guide rail is fixedly installed at the top of the movable plate, and the polarization binocular underwater camera is rotatably installed inside the mounting frame. A waterproof protective cover is also sleeved on the outer surface of the polarization binocular underwater camera. The front end of the waterproof protective cover is provided with an openable lens cover and a control mechanism for controlling the opening diameter of the lens cover. The link drive device is located on the guide rail and slides inside it. The other end of the link drive device is connected to the waterproof protective cover, and the link drive device is used to change the tilting angle of the polarization binocular underwater camera.

[0007] Further, the suspension lifting device includes a fixed frame, a horizontal axis, a drive mechanism, two opposite winches and two opposite winch ropes. The two ends of the horizontal axis are respectively rotatably installed inside the fixed frame. The drive mechanism is installed at the top of the fixed frame, and the drive mechanism is used to drive the horizontal axis to rotate. The two winches are respectively fixedly installed at the two ends of the horizontal axis. One ends of the two winch ropes are respectively wound on the surfaces of the two winches, and connection rings are wound at the other ends of the two winch ropes. Connection blocks are fixed at the bottoms of the two connection rings, and the two connection blocks are respectively fixedly installed at the two ends of the top of the movable plate.

[0008] Further, the lateral displacement device includes a guide rail, an adjustment screw rod, a slider and a power motor. The guide rail is fixedly installed at the bottom of the movable plate. The power motor is fixedly installed at one end of the guide rail. The output end of the power motor is fixedly connected to one end of the adjustment screw rod. The other end of the adjustment screw rod is rotatably installed inside the guide rail. The slider is slidably installed inside the guide rail, and the slider is threadedly connected to the adjustment screw rod. The bottom of the slider is fixedly connected to the mounting frame.

[0009] Further, the link drive device includes a drive motor, link one, link two, link three and a connection column. The drive motor is slidably installed on the top of the guide rail. The output end of the drive motor is fixedly connected to one end of link one. The two ends of link two are respectively hinged to one end of link one and link three. The other end of link three is fixedly connected to the connection column. The connection column is rotatably installed on the mounting frame, and the connection column is fixedly connected to the outer surface of the waterproof protective cover.

[0010] Further, the polarized binocular underwater camera includes an underwater camera body and a polarizing mirror. The underwater camera body is fixedly installed inside the waterproof protective cover. The polarizing mirror is threadedly installed inside the lens hood. The centers of the polarizing mirror, the underwater camera body, and the lens hood are collinear.

[0011] Further, the lens hood includes a hood body, a movable disk, and a plurality of opening and closing blades. The hood body is threadedly connected to one end of the waterproof protective cover. A plurality of sliding grooves are circumferentially and equidistantly formed at one end of the hood body. A driving groove is formed at the top of the hood body. The movable disk is rotatably installed inside the hood body. The plurality of opening and closing blades are respectively slidably installed in the sliding grooves on one side of the movable disk. Positioning columns are provided at one ends of the plurality of engaging blades, and the plurality of positioning columns respectively penetrate into the plurality of sliding grooves.

[0012] A driving plate is provided at the edge of the movable disk. A toothed ring is further provided at the top of the driving plate. The toothed ring is connected to the output end of the control mechanism.

[0013] Further, the control mechanism includes a rotary motor, a connecting rod, and a gear. The rotary motor is fixedly installed on the top of the waterproof protective cover. The output end of the rotary motor is fixedly connected to one end of the connecting rod. The other end of the connecting rod is fixedly connected to the gear. The gear meshes with the toothed ring.

[0014] Further, the driving mechanism includes a fixing plate, a motor, a chain, and two opposite sprockets. The fixing plate is fixedly installed on the outside of the fixing frame. The motor is fixedly installed on the fixing plate. The output end of the motor is fixedly connected to one of the sprockets. The other one is fixedly installed at one end of the horizontal shaft. The two sprockets are connected by the chain.

[0015] Further, an installation disk is further provided at the front end of the hood body. A plurality of lighting beads are circumferentially and equidistantly arranged in a ring on one side of the installation disk.

[0016] Compared with the related art, the polarized binocular detection device for underwater concrete structure defects provided by the present invention has the following beneficial effects:

[0017] 1. Through the suspension lifting device, the lateral displacement device, and the link driving device, the present invention can achieve precise control of the polarized binocular underwater camera in three dimensions (vertical, horizontal, and tilt angle), enabling the detection device to flexibly meet the detection requirements at different depths and positions, ensuring full coverage of the area to be detected, having multi-dimensional adjustment capabilities. Compared with the traditional manual diver detection method, the detection system with higher automation can significantly improve work efficiency, reduce errors caused by human factors, and can complete a larger range of detection tasks in a shorter time.

[0018] 2. The present invention adopts a waterproof protective cover and a control mechanism to adjust the size of the lens opening, and cooperates with multiple lighting beads on the circumferential direction of the mounting plate, enabling this device to work under various water quality conditions including turbid waters, ensuring the quality and stability of image acquisition. A polarizing filter is introduced and added at the front end of the underwater camera body as a core component, using the polarization characteristics of light to enhance the image contrast, which helps to distinguish the true texture of the concrete surface from the reflection artifacts, thereby more accurately identifying micro-cracks or surface defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the polarizing binocular detection device for underwater concrete structure defects provided by the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the connecting rod driving device provided by the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the lateral displacement device provided by the present invention;

[0022] Figure 4 It is a schematic cross-sectional structure diagram of the waterproof protective cover and the polarizing binocular underwater camera provided by the present invention;

[0023] Figure 5 is Figure 4 an enlarged schematic diagram of the structure at position A shown;

[0024] Figure 6 It is a schematic diagram of the disassembled structure of the lens cover provided by the present invention;

[0025] Figure 7 It is a schematic diagram of the back structure of the lens cover provided by the present invention.

[0026] Reference numerals in the figures: 1. movable plate; 2. mounting frame; 3. guide rail; 4. waterproof protective cover; 5. fixed frame; 6. horizontal axis; 7. winch; 8. winch rope; 9. connecting ring; 10. connecting block; 11. guide rail; 12. adjusting screw rod; 13. slider; 14. power motor; 15. driving motor; 16. connecting rod one; 17. connecting rod two; 18. connecting rod three; 19. connecting column; 20. underwater camera body; 21. polarizing filter; 22. cover body; 23. movable disk; 24. opening and closing blades; 25. sliding groove; 26. driving groove; 27. positioning column; 28. driving plate; 29. toothed ring; 30. rotating motor; 31. connecting rod; 32. gear; 33. fixing plate; 34. electric motor; 35. chain; 36. sprocket; 37. mounting plate; 38. lighting bead. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention will be further described below in conjunction with the drawings and embodiments.

[0028] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , where Figure 1 is the overall structural schematic diagram of the polarization binocular detection device for underwater concrete structure defects provided by the present invention;

[0029] Figure 2 is the structural schematic diagram of the connecting rod driving device provided by the present invention; Figure 3 is the structural schematic diagram of the lateral displacement device provided by the present invention; Figure 4 is the sectional structural schematic diagram of the waterproof protective cover and the polarization binocular underwater camera provided by the present invention; Figure 5 is Figure 4 the enlarged structural schematic diagram of the A position shown in; Figure 6 is the split structural schematic diagram of the lens hood provided by the present invention; Figure 7 is the back structural schematic diagram of the lens hood provided by the present invention.

[0030] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. The terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0031] In the specific implementation process, such as Figures 1 - 7As shown in the figure, the polarization binocular detection device for underwater concrete structure defects includes a suspension and lifting device, a movable plate 1, a lateral displacement device, a mounting frame 2, a polarization binocular underwater camera, a driving motor 15, a connecting rod 16, a connecting rod 17, a connecting rod 18, a connecting column 19, a guide rail 3 and a control mechanism. The suspension and lifting device is used to drive the movable plate 1 to move up and down. The lateral displacement device is fixedly installed at the bottom of the movable plate 1 and is used to drive the mounting frame 2 to move laterally. The guide rail 3 is fixedly installed on the top of the movable plate 1. The polarization binocular underwater camera is rotatably installed inside the mounting frame 2. A waterproof protective cover 4 is also sleeved on the outer surface of the polarization binocular underwater camera. The front end of the waterproof protective cover 4 is provided with an openable lens cover and a control mechanism for controlling the opening diameter of the lens cover. The driving motor 15 is located on the guide rail 3 and slides inside it. The output end of the driving motor 15 is fixedly connected to one end of the connecting rod 16. The two ends of the connecting rod 17 are respectively hinged to one end of the connecting rod 16 and the connecting rod 18. The other end of the connecting rod 18 is fixedly connected to the connecting column 19. The connecting column 19 is rotatably installed on the mounting frame 2 and is fixedly connected to the outer surface of the waterproof protective cover 4, which is used to change the tilting angle of the polarization binocular underwater camera. By starting the driving motor 15 to drive the connecting rod 16 to rotate, the connecting rod 16 drives the connecting rod 17 to move up and down, and the connecting rod 17 drives the connecting rod 18 to rotate on the mounting frame 2, and drives the waterproof protective cover 4 and the polarization binocular underwater camera to rotate through the connecting column 19, which is used to change the tilting angle of the polarization binocular underwater camera underwater.

[0032] It should be noted that the suspension and lifting device includes a fixed frame 5, a horizontal shaft 6, a fixed plate 33, a motor 34, a chain 35, two opposite sprockets 36, two opposite winches 7 and two opposite winch ropes 8. The two ends of the horizontal shaft 6 are respectively rotatably installed inside the fixed frame 5. The two winches 7 are respectively fixedly installed at the two ends of the horizontal shaft 6. One end of each of the two winch ropes 8 is wound around the surface of the two winches 7, and the other ends of the two winch ropes 8 are both wound with connection rings 9. The bottoms of the two connection rings 9 are fixed with connection blocks 10. The two connection blocks 10 are respectively fixedly installed at the two ends of the top of the movable plate 1. The fixed plate 33 is fixedly installed on the outside of the fixed frame 5. The motor 34 is fixedly installed on the fixed plate 33. The output end of the motor 34 is fixedly connected to one of the sprockets 36, and the other is fixedly installed at one end of the horizontal shaft 6. The two sprockets 36 are connected by a chain 35. By starting the motor 34 to drive one of the sprockets 36 to rotate, the other sprocket 36 rotates synchronously through the chain 35 drive. At the same time, the horizontal shaft 6 drives the two winches 7 to rotate and loosen or tighten the winch ropes 8, so that the two winch ropes 8 drive the movable plate 1 to move up and down in the direction of the fixed frame 5, which is used to control the draft depth of the device.

[0033] It should be noted that the lateral displacement device includes a guide rail 11, an adjustment screw 12, a slider 13 and a power motor 14. The guide rail 11 is fixedly installed at the bottom of the movable plate 1. The power motor 14 is fixedly installed at one end of the guide rail 11. The output end of the power motor 14 is fixedly connected to one end of the adjustment screw 12. The other end of the adjustment screw 12 is rotatably installed inside the guide rail 11. The slider 13 is slidably installed inside the guide rail 11, and the slider 13 is threadedly connected to the adjustment screw 12. The bottom of the slider is fixedly connected to the mounting bracket 2. By starting the power motor 14 to drive the adjustment screw 12 to rotate, the adjustment screw 12 will drive the slider 13 to move inside the guide rail 11. At the same time, the slider 13 drives the mounting bracket 2 to move synchronously. In addition, during the movement, components such as the guide rail 11 in the lateral displacement device are above the water surface.

[0034] Embodiment 2

[0035] In a specific implementation process, the polarization binocular underwater camera includes an underwater camera body 20 and a polarizing mirror 21. The underwater camera body 20 is fixedly installed inside the waterproof protective cover 4. The polarizing mirror 21 is threadedly installed inside the lens hood. The centers of the polarizing mirror 21, the underwater camera body 20 and the lens hood are collinear.

[0036] It should be noted that the lens hood includes a hood body 22, a movable disk 23 and a plurality of opening and closing blades 24. The hood body 22 is threadedly connected to one end of the waterproof protective cover 4. A plurality of sliding grooves 25 are circumferentially and equidistantly formed at one end of the hood body 22. A driving groove 26 is formed at the top of the hood body 22. The movable disk 23 is rotatably installed inside the hood body 22. A plurality of opening and closing blades 24 are respectively slidably installed in the sliding grooves on one side of the movable disk 23. Positioning columns 27 are provided at one ends of the plurality of engaging blades, and the plurality of positioning columns 27 respectively penetrate into the plurality of sliding grooves 25. A driving plate 28 is provided at the edge of the movable disk 23, and a toothed ring 29 is further provided at the top of the driving plate 28. The toothed ring 29 is connected to the output end of the control mechanism. When the movable disk 23 is rotated, the positioning columns 27 drive the plurality of opening and closing blades 24 to rotate under the restriction of the sliding grooves 25, so that the plurality of opening and closing blades 24 can be gathered or dispersed towards the center to adjust the size of the lens opening.

[0037] The control mechanism includes a rotary motor 30, a connecting rod 31 and a gear 32. The rotary motor 30 is fixedly installed on the top of the waterproof protective cover 4. The output end of the rotary motor 30 is fixedly connected to one end of the connecting rod 31. The other end of the connecting rod 31 is fixedly connected to the gear 32. The gear 32 is meshed with the toothed ring 29. By starting the rotary motor 30 to drive the connecting rod 31 and the gear 32 to rotate, the gear 32 drives the toothed ring 29 and the driving plate 28 to swing, thereby controlling the rotation position of the movable disk 23.

[0038] Embodiment 3

[0039] In a specific implementation process, an installation disk 37 is further provided at the front end of the cover body 22. On one side of the installation disk 37, a plurality of lighting beads 38 are circumferentially and equidistantly arranged in a ring, and the plurality of lighting beads 38 provide lighting conditions for the polarized binocular underwater camera.

[0040] The working principle provided by the present invention is as follows: When the device is in use, the device can be fixed on the loading vehicle or the site to be detected by means of bolt fixation. By starting the power motor 14, the adjusting screw rod 12 is driven to rotate, and the adjusting screw rod 12 drives the slider 13 to move within the guide rail 11. At the same time, the slider 13 drives the mounting bracket 2 to move synchronously. In addition, during the movement, components such as the guide rail 11 in the lateral displacement device are above the water surface to complete the lateral positioning work. By starting the motor 34 to drive one of the sprockets 36 to rotate, the other sprocket 36 rotates synchronously through the chain 35 transmission. At the same time, the cross shaft 6 drives the two winches 7 to rotate and loosen or tighten the winch ropes 8, so that the two winch ropes 8 drive the movable plate 1 to move up and down in the direction of the fixed frame 5 to control the draft depth of the device. By starting the drive motor 15 to drive the first connecting rod 16 to rotate, the first connecting rod 16 drives the second connecting rod 17 to move up and down, and the second connecting rod 17 drives the third connecting rod 18 to rotate on the mounting bracket 2, and drives the waterproof protective cover 4 and the polarized binocular underwater camera to rotate through the connecting column 19 to change the pitching angle of the polarized binocular underwater camera underwater. The underwater camera main body 20 performs shooting and detection. The plurality of lighting beads 38 provide lighting conditions for the polarized binocular underwater camera, and a polarization mirror 21 is introduced and added at the front end of the underwater camera main body 20 as a core component to enhance the image contrast by using the polarization characteristics of light, which helps to distinguish the true texture of the concrete surface from the reflection artifacts.

[0041] The circuits and controls involved in the present invention are all prior arts and will not be elaborated here too much.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0043] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only includes an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A polarization binocular detection device for underwater concrete structure defects, characterized in that: The invention comprises a suspension lifting device, a movable plate (1), a lateral displacement device, a mounting frame (2), a polarized binocular underwater camera, a connecting rod driving device, a guide rail (3) and a control mechanism, wherein the suspension lifting device is used to drive the movable plate (1) to perform lifting and lowering movements, the lateral displacement device is fixedly mounted on the bottom of the movable plate (1), the lateral displacement device is used to drive the mounting frame (2) to perform lateral movements, the guide rail (3) is fixedly mounted on the top of the movable plate (1), the polarized binocular underwater camera is rotatably mounted on the inner side of the mounting frame (2), the outer surface of the polarized binocular underwater camera is also sleeved with a waterproof protective cover (4), the front end of the waterproof protective cover (4) is provided with an openable mirror cover and a control mechanism for controlling the opening and closing diameter of the mirror cover, the connecting rod driving device is located on the guide rail (3) and slides inside the guide rail, the other end of the connecting rod driving device is connected to the waterproof protective cover (4), and the connecting rod driving device is used to change the tilt angle of the polarized binocular underwater camera.

2. The polarization binocular detection device for underwater concrete structure defects according to claim 1 is characterized in that: The suspension lifting device comprises a fixed frame (5), a transverse axis (6), a driving mechanism, two opposite winches (7) and two opposite twisted ropes (8), the two ends of the transverse axis (6) are respectively rotatably mounted on the inner side of the fixed frame (5), the driving mechanism is mounted on the top of the fixed frame (5), and the driving mechanism is used to drive the transverse axis (6) to rotate, the two winches (7) are respectively fixedly mounted on the two ends of the transverse axis (6), one end of the two twisted ropes (8) are respectively wound around the surfaces of the two winches (7), and the other ends of the two twisted ropes (8) are both wound around connecting rings (9), the bottoms of the two connecting rings (9) are fixed with connecting blocks (10), and the two connecting blocks (10) are respectively fixedly mounted on the two ends of the top of the movable plate (1).

3. The polarization binocular detection device for underwater concrete structure defects according to claim 2 is characterized in that: The lateral displacement device comprises a guide rail (11), an adjusting screw rod (12), a slider (13) and a power motor (14); the guide rail (11) is fixedly mounted on the bottom of the movable plate (1); the power motor (14) is fixedly mounted on one end of the guide rail (11); the output end of the power motor (14) is fixedly connected to one end of the adjusting screw rod (12); the other end of the adjusting screw rod (12) is rotatably mounted inside the guide rail (11); the slider (13) is slidably mounted inside the guide rail (11); the slider (13) is threadedly connected to the adjusting screw rod (12); and the bottom of the slider is fixedly connected to the mounting frame (2).

4. The polarization binocular detection device for underwater concrete structure defects according to claim 3 is characterized in that: The connecting rod driving device comprises a driving motor (15), a connecting rod one (16), a connecting rod two (17), a connecting rod three (18) and a connecting column (19); the driving motor (15) is slidably mounted on the top of the guide rail (3); the output end of the driving motor (15) is fixedly connected to one end of the connecting rod one (16); the two ends of the connecting rod two (17) are respectively hinged to one end of the connecting rod one (16) and the connecting rod three (18); the other end of the connecting rod three (18) is fixedly connected to the connecting column (19); the connecting column (19) is rotatably mounted on the mounting frame (2), and the connecting column (19) is fixedly connected to the outer surface of the waterproof protective cover (4).

5. The polarization binocular detection device for underwater concrete structure defects according to claim 4, characterized in that: The polarized binocular underwater camera comprises an underwater camera body (20) and a polarizing lens (21), wherein the underwater camera body (20) is fixedly mounted inside the waterproof protective cover (4), and the polarizing lens (21) is threadedly mounted inside the lens cover, and the centers of the polarizing lens (21), the underwater camera body (20) and the lens cover are collinear.

6. The polarization binocular detection device for underwater concrete structure defects according to claim 5, characterized in that: The mirror cover comprises a cover body (22), a movable disk (23) and a plurality of opening and closing blades (24); the cover body (22) is threadedly connected to one end of the waterproof protective cover (4); one end of the cover body (22) is provided with a plurality of sliding grooves (25) at equal distances in the circumferential direction; a driving groove (26) is provided at the top of the cover body (22); the movable disk (23) is rotatably mounted inside the cover body (22); the plurality of opening and closing blades (24) are respectively slidably mounted in the sliding grooves on one side of the movable disk (23); one end of the plurality of locking blades is provided with a positioning column (27), and the plurality of positioning columns (27) are respectively inserted into the plurality of sliding grooves (25); A driving plate (28) is provided on the edge of the movable disk (23), and a gear ring (29) is also provided on the top of the driving plate (28). The gear ring (29) is connected to the output end of the control mechanism.

7. The polarization binocular detection device for underwater concrete structure defects according to claim 6, characterized in that: The control mechanism comprises a rotating motor (30), a connecting rod (31) and a gear (32); the rotating motor (30) is fixedly mounted on the top of the waterproof protective cover (4); the output end of the rotating motor (30) is fixedly connected to one end of the connecting rod (31); the other end of the connecting rod (31) is fixedly connected to the gear (32); and the gear (32) is meshed with the gear ring (29).

8. The polarization binocular detection device for underwater concrete structure defects according to claim 7, characterized in that: The driving mechanism comprises a fixed plate (33), a motor (34), a chain (35) and two opposite sprocket wheels (36); the fixed plate (33) is fixedly mounted on the outside of the fixed frame (5); the motor (34) is fixedly mounted on the fixed plate (33); the output end of the motor (34) is fixedly connected to one of the sprocket wheels (36); the other sprocket wheel (36) is fixedly mounted on one end of the transverse shaft (6); and the two sprocket wheels (36) are connected via the chain (35).

9. The polarization binocular detection device for underwater concrete structure defects according to claim 8, characterized in that: A mounting plate (37) is also provided at the front end of the cover body (22), and a plurality of lighting lamp beads (38) are circumferentially and equidistantly arranged on one side of the mounting plate (37).

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