Bridge stay cable appearance detection device

Abstract

The invention discloses a bridge stay cable appearance detection device, and belongs to the technical field of bridge stay cable appearance detection, the bridge stay cable appearance detection device comprises two mobile shells, walking wheels are arranged in the mobile shells along the advancing direction, and the outer edges of the walking wheels extend out of the inner walls of the mobile shells and then are in contact with the outer walls of stay cables; a plurality of pressure rods distributed in a circumferential mode penetrate through the inner wall of the movable shell, the ends, located in the movable shell, of the pressure rods are connected with the inner wall of the movable shell through first elastic pieces, and the other ends of the pressure rods are used for sensing the pressure of the outer wall of the stay cable. Spraying cylinders corresponding to the pressure rods are arranged on the side wall of the supporting plate, the spraying cylinders communicate with spraying pipes, the spraying pipes penetrate through the inner wall of the movable shell, and extrusion mechanisms are arranged in the spraying cylinders. According to the method, cracks can be repaired in time after appearance detection of the stay cable is completed, and the phenomenon that the stay cable is further corroded is avoided.

Description

Technical Field

[0001] This invention relates to a device for visual inspection of bridge stay cables, belonging to the field of visual inspection technology for bridge stay cables. Background Technology

[0002] After prolonged exposure to wind and sun, the PE sheath of the stay cable may crack. If not treated in time, rainwater will flow into the cable through the cracks, accelerating the corrosion of the internal steel bars and threatening the safety of the bridge.

[0003] In existing technologies, the appearance of cable stays is mostly inspected using cable stay appearance inspection devices. These devices mainly consist of a walking component and a camera component. The walking component drives the camera component to move outside the cable stay and the camera component takes pictures of the cable stay's appearance.

[0004] However, this testing device can only inspect the appearance of the cable. After the inspection, staff need to repair the cracks in the PE sheath of the cable. If the staff cannot repair them in time, the cable is prone to further corrosion. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a bridge cable appearance inspection device that can repair cracks in a timely manner after the appearance inspection of the cable, so as to avoid further corrosion of the cable.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A bridge cable-stayed bridge appearance inspection device includes two symmetrically distributed movable housings. Inside each movable housing, a traveling wheel is arranged along the forward direction. The outer edge of each traveling wheel extends out of the inner wall of the movable housing and contacts the outer wall of the cable-stayed bridge. A motor is installed outside one of the movable housings, and a rotating rod is mounted on the output end of the motor. The rotating rod passes through the end face of the movable housing and is rotatably connected to the end face of the movable housing. The rotating rod drives the traveling wheel to rotate via a transmission mechanism. Several circumferentially distributed pressure rods pass through the inner wall of the movable housing. The pressure rods are slidably connected to the movable housing and are located at the... One end of the movable outer shell is connected to the inner wall of the movable outer shell through a first elastic element. The other end of the pressure rod is used to sense the pressure on the outer wall of the cable. A support plate is provided inside the movable outer shell. Several spray tubes corresponding to the pressure rods are provided on the side wall of the support plate. Spray pipes are connected to the spray tubes and penetrate the inner wall of the movable outer shell. An extrusion mechanism is provided inside the spray tubes. When the pressure rod detects a crack on the surface of the cable, the first elastic element drives the pressure rod to move inward to drive the extrusion mechanism to work, so that the paint inside the spray tube is sprayed onto the crack on the surface of the cable through the spray pipe.

[0008] The transmission mechanism includes support blocks arranged symmetrically inside the movable housing, with the rotating shaft rotatably connected between the support blocks. The rotating shaft passes through and connects to the traveling wheel. A first bevel gear is provided outside the rotating shaft, and a second bevel gear is provided outside the rotating rod. The first bevel gear meshes with the second bevel gear.

[0009] The extrusion mechanism includes a piston disposed inside the spraying cylinder, the piston being connected to a threaded sleeve, the outer wall of the threaded sleeve being provided with symmetrically distributed limiting blocks, the inner wall of the spraying cylinder being provided with symmetrically distributed limiting grooves, the end of the limiting block being located inside the limiting groove and slidably connected to the limiting groove, and the end of the threaded sleeve away from the piston being threadedly connected to a threaded rod, the threaded rod penetrating the side wall of the extraction cylinder and being connected to a rotating assembly, the rotating assembly being used to drive the threaded rod to rotate.

[0010] The rotating assembly includes a transmission rod passing through the end of the threaded rod. A first gear is disposed on the outside of the transmission rod. A semi-circular toothed ring is rotatably connected inside the movable housing. A clearance groove is provided on the inner wall of the movable housing for the semi-circular toothed ring to pass through. A pressure rod is connected to a pushing component. When a crack appears on the surface of the cable, the pressure rod pushes the transmission rod through the pushing component, thereby causing the first gear to mesh with the semi-circular toothed ring. A second gear is disposed on the outside of the rotating rod, and the second gear meshes with the semi-circular toothed ring. A symmetrically distributed slider is disposed at one end of the transmission rod located inside the threaded rod. A symmetrically distributed sliding groove is provided on the inner wall of the threaded sleeve. The slider is located inside the sliding groove and is slidably connected to the sliding groove.

[0011] The pushing component includes a first magnet disposed on the outer wall of the pressure rod, and a second magnet fixed to the end of the transmission rod. The second magnet has the same magnetism as the first magnet. One end of the transmission rod located inside the threaded rod is connected to the inner wall of the threaded rod through a second elastic element.

[0012] The semi-circular toothed ring has symmetrically distributed arc-shaped retaining strips on both sides. The arc-shaped retaining strips are connected to the inner wall of the movable outer shell. The side wall of the semi-circular toothed ring is provided with an arc-shaped groove. The side wall of the arc-shaped retaining strip is located inside the arc-shaped groove and is slidably connected to the arc-shaped groove.

[0013] The inner wall of the movable outer shell is provided with a plurality of limiting rods arranged in a circle. Each limiting rod extends into the inside of the pressure rod and is slidably connected to the pressure rod. The end of the pressure rod located outside the movable outer shell is rotatably connected to a pressure wheel, and the pressure wheel contacts the outer wall of the cable.

[0014] The two movable housings are connected by bolts.

[0015] The beneficial effects of this invention are as follows: The bridge cable-stayed bridge appearance inspection device provided by this invention moves the pressure rod outside the cable-stayed bridge by moving the outer shell. When a crack appears in the cable skin, the degree of compression of the pressure rod by the cable-stayed bridge will change. At this time, the paint inside the spray gun will be automatically discharged from the spray pipe and sprayed on the crack. On the one hand, it is convenient for the staff to observe the location and length of the crack in time, which facilitates the subsequent maintenance of the cable-stayed bridge. On the other hand, the paint can play a protective role for the cable-stayed bridge in time, thereby preventing further corrosion of the cable-stayed bridge. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the external structure of the movable outer shell in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the internal structure of the movable outer shell in an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the pressure rod connection structure in an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the connection structure between the first gear and the semi-circular toothed ring in an embodiment of the present invention;

[0020] Figure 5 This is a cross-sectional view of the internal structure of the spray gun in an embodiment of the present invention;

[0021] The reference numerals in the figure are as follows: 1-Moving outer shell; 2-Walking wheel; 3-Motor; 4-Transmission mechanism; 41-Support block; 42-Rotating shaft; 43-First bevel gear; 44-Second bevel gear; 5-Extrusion mechanism; 51-Piston; 52-Threaded sleeve; 53-Limiting block; 54-Limiting groove; 55-Threaded rod; 56-Transmission rod; 57-Slider; 58-Slide groove; 59-Second elastic element; 510-First gear; 511-Second magnet; 512-First magnet; 513-Semi-circular toothed ring; 514-Arc-shaped retaining strip; 515-Arc-shaped groove; 516-Second gear; 6-Spraying cylinder; 7-Support plate; 8-Pressure rod; 9-Rotating rod; 10-Limiting rod; 11-First elastic element; 12-Pressure wheel; 13-Spray nozzle. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and should not be used to limit the scope of protection of the present invention.

[0023] Example 1

[0024] like Figures 1 to 4As shown, the present invention discloses a bridge cable-stayed cable appearance inspection device, including two symmetrically distributed movable shells 1. Each movable shell 1 is provided with symmetrically distributed traveling wheels 2 inside. The traveling wheels 2 extend into the outside of the movable shell 1. A motor 3 is fixed to the outside of one of the movable shells 1. A rotating rod 9 is installed at the output end of the motor 3. The rotating rod 9 passes through the side wall of the movable shell 1 and is rotatably connected to the side wall of the movable shell 1. The rotating rod 9 is connected to the traveling wheel 2 through a transmission mechanism 4. The transmission mechanism 4 is used to drive the walking wheel 2 to rotate. Multiple pressure rods 8 are circumferentially distributed through the inner wall of the movable outer shell 1. The pressure rods 8 are slidably connected to the inner wall of the movable outer shell 1. One end of the pressure rod 8 located inside the movable outer shell 1 is connected to the inner wall of the movable outer shell 1 through the first elastic element 11. A support plate 7 is fixed inside the movable outer shell 1. Multiple spraying cylinders 6 are circumferentially distributed on the side wall of the support plate 7. The spraying cylinders 6 are connected to a spray pipe 13. The spray pipe 13 penetrates the inner wall of the movable outer shell 1. The spraying cylinder 6 is equipped with a pressing mechanism 5. When a crack appears on the surface of the cable, the first elastic element 11 releases elastic potential energy, so that the pressure rod 8 presses the paint inside the spraying cylinder 6 through the pressing mechanism 5 and sprays it onto the crack position on the surface of the cable through the spray pipe 13.

[0025] The working principle of this invention is as follows: When inspecting the appearance of the stay cable, two movable housings 1 are placed on the outside of the stay cable and fixed together by bolts or other fixing methods to form a complete walking device. At this time, the walking wheels 2 are in close contact with the outer wall of the stay cable, and the end of the pressure rod 8 is also in close contact with the stay cable. The stay cable compresses the first elastic element 11 through the pressure rod 8, and the first elastic element 11 is in a compressed state. After the movable housings 1 are connected, the motor 3 is started. The motor 3 drives the rotating rod 9 to rotate. The rotating rod 9 drives the walking wheel 2 inside one of the movable housings 1 to rotate through the transmission mechanism 4, thereby enabling the movable housing 1 to move. The device can move outside the cable. When a crack appears in the cable skin, the pressure of the cable on the pressure rod 8 decreases. Under the action of the first elastic element 11, the pressure rod 8 moves towards the inside of the crack. The first elastic element 11 can be a spring. After the pressure rod 8 has moved, the extrusion mechanism 5 extrudes the paint inside the spray cylinder 6, so that the paint inside the spray cylinder 6 can be discharged from the spray pipe 13. As the moving outer shell 1 continues to move, the paint will be accurately sprayed inside the crack, thereby achieving the detection purpose. When the crack on the surface of the cable ends, the pressure of the cable on the pressure rod 8 increases, and the pressure rod 8 no longer extrudes the paint inside the spray cylinder 6 through the extrusion mechanism 5.

[0026] On the one hand, this invention allows staff to observe the location and length of cracks in a timely manner, facilitating subsequent maintenance of the stay cables. On the other hand, the coating can provide timely protection for the stay cables, thereby preventing further corrosion.

[0027] Example 2

[0028] This embodiment is a further improvement on embodiment 1, such as... Figure 2 As shown, the transmission mechanism 4 includes support blocks 41 fixed inside the movable housing 1 and symmetrically distributed. A rotating shaft 42 is rotatably connected between the support blocks 41. The rotating shaft 42 passes through the walking wheel 2 and is fixedly connected to the walking wheel 2. A first bevel gear 43 is fixed to the outside of the rotating shaft 42, and a second bevel gear 44 is fixed to the outside of the rotating rod 9. The first bevel gear 43 and the second bevel gear 44 mesh with each other.

[0029] When inspecting the appearance of the cable stays, the motor 3 drives the rotating rod 9 to rotate. At the same time, the rotating rod 9 rotates and drives the rotating shaft 42 to rotate through the meshing of the second bevel gear 44 and the first bevel gear 43. The rotating shaft 42 drives the traveling wheel 2 to rotate, so that the movable shell 1 can move outside the cable stays, thereby realizing the automatic inspection of the cable stays.

[0030] like Figure 5 As shown, the extrusion mechanism 5 includes a piston 51 disposed inside the spraying cylinder 6. The piston 51 is fixedly connected to a threaded sleeve 52. The outer wall of the threaded sleeve 52 is fixed with symmetrically distributed limiting blocks 53. The inner wall of the spraying cylinder 6 is provided with symmetrically distributed limiting grooves 54. The end of the limiting block 53 is located inside the limiting groove 54 and is slidably connected to the limiting groove 54. The end of the threaded sleeve 52 away from the piston 51 is threadedly connected to a threaded rod 55. The threaded rod 55 passes through the side wall of the extraction cylinder and is connected to a rotating assembly. The rotating assembly is used to drive the threaded rod 55 to rotate.

[0031] When a crack appears in the cable skin, the pressure of the cable on the pressure rod 8 decreases. Under the action of the first elastic element 11, the pressure rod 8 moves towards the inside of the crack. After the pressure rod 8 has moved, the rotating component drives the threaded rod 55 to rotate. Through the threaded connection between the threaded rod 55 and the threaded sleeve 52, the piston 51 moves inside the spraying cylinder 6. The piston 51 squeezes the paint inside the spraying cylinder 6, so that the paint can be discharged from the spray pipe 13. The limiting groove 54 plays a limiting role for the threaded sleeve 52 through the limiting block 53, avoiding the phenomenon that the rotation of the threaded rod 55 drives the rotation of the threaded sleeve 52.

[0032] like Figures 2 to 5As shown, the rotating assembly includes a transmission rod 56 passing through the end of the threaded rod 55. A first gear 510 is fixed to the outside of the transmission rod 56. A semi-circular toothed ring 513 is rotatably connected inside the movable housing 1, and a clearance groove is provided on the inner wall of the movable housing 1 for the semi-circular toothed ring 513 to pass through. A pressure rod 8 is connected to a pushing component. When a crack appears on the surface of the cable, the pressure rod 8 pushes the transmission rod 56 through the pushing component, thereby causing the first gear 510 to mesh with the semi-circular toothed ring 513. A second gear 516 is fixed to the outside of the rotating rod 9. The second gear 516 meshes with the semi-circular toothed ring 513. A symmetrically distributed slider 57 is fixed to one end of the transmission rod 56 located inside the threaded rod 55. A symmetrically distributed sliding groove 58 is provided on the inner wall of the threaded sleeve 52. The slider 57 is located inside the sliding groove 58 and is slidably connected to the sliding groove 58.

[0033] When a crack appears in the cable skin, the pressure of the cable on the pressure rod 8 decreases. At this time, the pressure rod 8 pushes the transmission rod 56 through the pushing component. The transmission rod 56 drives the first gear 510 to move, so that the first gear 510 meshes with the semi-circular toothed ring 513. In addition, while the rotating rod 9 rotates, it also drives the semi-circular toothed ring 513 to rotate through the second gear 516. While the semi-circular toothed ring 513 rotates, it squeezes the semi-circular toothed ring 513 inside another moving housing 1. The two semi-circular toothed rings 513 form a complete toothed ring, so that no matter which pressure rod 8 moves, the first gear 510 corresponding to that pressure rod 8 can mesh with the semi-circular toothed ring 513, and the semi-circular toothed ring 513 drives the first gear 510 to rotate. The first gear 510 drives the corresponding transmission rod 56 to rotate. The transmission rod 56 drives the threaded rod 55 to rotate through the cooperation of the slider 57 and the groove 58, so that the piston 51 can squeeze the paint inside the corresponding spraying cylinder 6.

[0034] like Figure 4 and Figure 5 As shown, the pushing component includes a first magnet 512 fixed on the outer wall of the pressure rod 8, and a second magnet 511 fixed at the end of the transmission rod 56. The second magnet 511 has the same magnetism as the first magnet 512. One end of the transmission rod 56 located inside the threaded rod 55 is connected to the inner wall of the threaded rod 55 through a second elastic member 59.

[0035] When the cable skin is intact, the first magnet 512 and the second magnet 511 are misaligned and do not repel each other. When the cable skin cracks, the pressure of the cable on the pressure rod 8 decreases, and the pressure rod 8 moves towards the crack under the action of the first elastic element 11. As the pressure rod 8 moves, it drives the first magnet 512 to move. At this time, the first magnet 512 and the second magnet 511 are no longer misaligned and repel each other. The mutual repulsion of the magnets drives the transmission rod 56 to move, and the transmission rod 56 drives the first gear 510 to move, so that the first gear 510 meshes with the semi-circular toothed ring 513. At this time, the semi-circular toothed ring 513 rotates and drives the transmission rod 56 to rotate through meshing with the first gear 510. The second elastic element 59 can be a spring, which can ensure the initial position of the transmission rod 56.

[0036] like Figure 3 As shown, the semi-circular toothed ring 513 has symmetrically distributed arc-shaped retaining strips 514 on both sides. The arc-shaped retaining strips 514 are fixedly connected to the inner wall of the movable outer shell 1. Each side wall of the semi-circular toothed ring 513 has an arc-shaped groove 515, and the side wall of the arc-shaped retaining strip 514 is located inside the arc-shaped groove 515 and is slidably connected to the arc-shaped groove 515. By limiting the semi-circular toothed ring 513 with the arc-shaped retaining strips 514, the stability of the semi-circular toothed ring 513 during rotation can be effectively improved.

[0037] like Figure 3 As shown, multiple limiting rods 10 are fixed on the inner wall of the movable housing 1 in a circular arrangement. The limiting rods 10 extend into the interior of multiple pressure rods 8 and are slidably connected to the pressure rods 8. Each pressure rod 8 has a pressure wheel 12 rotatably connected to one end outside the movable housing 1. By limiting the pressure rods 8 with the limiting rods 10, the stability of the pressure rods 8 during movement can be effectively improved. The pressure wheel 12 reduces the friction between the pressure rods 8 and the stay cables, thereby preventing the pressure rods 8 from getting stuck at the cracks in the stay cable sheath.

[0038] The working principle of this invention is as follows: When inspecting the appearance of a stay cable, two movable outer shells 1 are placed outside the stay cable and fixed together with bolts or other fixing methods to form a complete walking device. At this time, the walking wheels 2 are in close contact with the outer wall of the stay cable, and the end of the pressure rod 8 is also in close contact with the stay cable. After the movable outer shells 1 are connected, the motor 3 is started. The motor 3 drives the rotating rod 9 to rotate. The rotating rod 9 drives the rotating shaft 42 to rotate through the meshing of the second bevel gear 44 and the first bevel gear 43. The rotating shaft 42 drives the walking wheels 2 to rotate, so that the movable outer shells 1 can move outside the stay cable, thereby realizing the automatic detection of the stay cable. On the other hand, the rotating rod 9 drives the semi-circular toothed ring 513 to rotate through the second gear 516. When a crack appears in the stay cable skin, the pressure of the stay cable on the pressure rod 8 is reduced. Under the action of the first elastic element 11, the pressure rod 8 moves towards the inside of the crack, pressing... As the lever 8 moves, it drives the first magnet 512 to move. At this time, the first magnet 512 and the second magnet 511 repel each other. The mutual repulsion of the magnets drives the transmission rod 56 to move. The transmission rod 56 drives the first gear 510 to move, so that the first gear 510 meshes with the semi-circular toothed ring 513. At this time, the semi-circular toothed ring 513 rotates, and at the same time, it drives the transmission rod 56 to rotate through the meshing with the first gear 510. The transmission rod 56 drives the threaded rod 55 to rotate through the cooperation of the slider 57 and the groove 58. Through the threaded connection between the threaded rod 55 and the threaded sleeve 52, it drives the piston 51 to move inside the spraying cylinder 6. The piston 51 squeezes the paint inside the spraying cylinder 6, so that the paint can be discharged from the spray pipe 13. On the one hand, it is convenient for the staff to observe the location and length of the crack in time, which is convenient for the staff to maintain the cable. On the other hand, the paint can play a protective role for the cable in time, thereby preventing further corrosion of the cable.

[0039] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A device for visually inspecting bridge stay cables, characterized in that: The device includes two symmetrically distributed movable outer shells (1). Inside each movable outer shell (1) are wheels (2) arranged along the forward direction. The outer edges of the wheels (2) extend beyond the inner wall of the movable outer shell (1) and contact the outer wall of the cable-stayed bridge. A motor (3) is installed outside one of the movable outer shells (1). A rotating rod (9) is mounted on the output end of the motor (3). The rotating rod (9) passes through the end face of the movable outer shell (1) and is rotatably connected to it. The rotating rod (9) drives the wheels (2) to rotate via a transmission mechanism (4). Several circumferentially distributed pressure rods (8) pass through the inner wall of the movable outer shell (1). The pressure rods (8) are slidably connected to the movable outer shell (1), with one end of each pressure rod located inside the movable outer shell (1). The first elastic element (11) is connected to the inner wall of the movable outer shell (1). The other end of the pressure rod (8) is used to sense the pressure on the outer wall of the cable. The movable outer shell (1) is provided with a support plate (7). Several spray tubes (6) are provided on the side wall of the support plate (7), which are respectively corresponding to the pressure rod (8). The spray tube (6) is connected to a spray pipe (13). The spray pipe (13) penetrates the inner wall of the movable outer shell (1). The spray tube (6) is provided with a squeezing mechanism (5). When the pressure rod (8) detects a crack on the surface of the cable, the first elastic element (11) drives the pressure rod (8) to move inward to drive the squeezing mechanism (5) to work, so that the paint inside the spray tube (6) is sprayed onto the crack position on the surface of the cable through the spray pipe (13).

2. The bridge cable-stayed cable appearance inspection device according to claim 1, characterized in that: The transmission mechanism (4) includes support blocks (41) arranged symmetrically inside the movable housing (1). The support blocks (41) are rotatably connected to the rotating shaft (42). The rotating shaft (42) passes through the walking wheel (2) and is connected to the walking wheel (2). A first bevel gear (43) is provided outside the rotating shaft (42), and a second bevel gear (44) is provided outside the rotating rod (9). The first bevel gear (43) meshes with the second bevel gear (44).

3. The bridge cable-stayed cable appearance inspection device according to claim 1, characterized in that: The extrusion mechanism (5) includes a piston (51) disposed inside the spraying cylinder (6). The piston (51) is connected to a threaded sleeve (52). The outer wall of the threaded sleeve (52) is provided with symmetrically distributed limiting blocks (53). The inner wall of the spraying cylinder (6) is provided with symmetrically distributed limiting grooves (54). The end of the limiting block (53) is located inside the limiting groove (54) and is slidably connected to the limiting groove (54). The end of the threaded sleeve (52) away from the piston (51) is threadedly connected to a threaded rod (55). The threaded rod (55) passes through the side wall of the extraction cylinder and is connected to a rotating assembly. The rotating assembly is used to drive the threaded rod (55) to rotate.

4. The bridge cable-stayed cable appearance inspection device according to claim 3, characterized in that: The rotating assembly includes a transmission rod (56) passing through the end of the threaded rod (55). A first gear (510) is provided on the outside of the transmission rod (56). A semi-circular toothed ring (513) is rotatably connected inside the movable housing (1). A clearance groove is provided on the inner wall of the movable housing (1) for the semi-circular toothed ring (513) to pass through. The pressure rod (8) is connected to a pushing component. When a crack appears on the surface of the cable, the pressure rod (8) pushes the transmission rod (56) through the pushing component, thereby causing the first gear (510) to rotate. A gear (510) meshes with the semi-circular toothed ring (513). A second gear (516) is provided on the outside of the rotating rod (9). The second gear (516) meshes with the semi-circular toothed ring (513). A slider (57) is symmetrically distributed at one end of the transmission rod (56) located inside the threaded rod (55). A symmetrically distributed sliding groove (58) is provided on the inner wall of the threaded sleeve (52). The slider (57) is located inside the sliding groove (58) and is slidably connected to the sliding groove (58).

5. The bridge cable-stayed cable appearance inspection device according to claim 4, characterized in that: The pushing component includes a first magnet (512) disposed on the outer wall of the pressure rod (8), and a second magnet (511) fixed at the end of the transmission rod (56). The second magnet (511) has the same magnetism as the first magnet (512). One end of the transmission rod (56) located inside the threaded rod (55) is connected to the inner wall of the threaded rod (55) through a second elastic element (59).

6. The bridge cable-stayed cable appearance inspection device according to claim 4, characterized in that: The semi-circular toothed ring (513) has symmetrically distributed arc-shaped retaining strips (514) on both sides. The arc-shaped retaining strips (514) are connected to the inner wall of the movable outer shell (1). The side wall of the semi-circular toothed ring (513) is provided with arc-shaped grooves (515). The side wall of the arc-shaped retaining strips (514) is located inside the arc-shaped grooves (515) and is slidably connected to the arc-shaped grooves (515).

7. The bridge cable-stayed cable appearance inspection device according to claim 1, characterized in that: The inner wall of the movable outer shell (1) is provided with a plurality of limiting rods (10) arranged in a circle. The limiting rods (10) extend into the pressure rod (8) one by one and slide in connection with the pressure rod (8). The pressure rod (8) is rotatably connected to a pressure wheel (12) at one end outside the movable outer shell (1). The pressure wheel (12) contacts the outer wall of the cable.

8. The bridge cable-stayed cable appearance inspection device according to claim 1, characterized in that: The two movable housings (1) are connected by bolts.

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