Bridge stay cable appearance detection device

Abstract

The invention relates to the technical field of bridge detection, in particular to a bridge stay cable appearance detection device which comprises two movable shells which are symmetrically distributed, arc-shaped grooves are formed in the sides, close to each other, of the movable shells, and walking wheels which are symmetrically distributed are arranged in the arc-shaped grooves. A plurality of pressure rods distributed circumferentially 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, a supporting plate is fixed to the interior of the movable shell, a plurality of spraying barrels distributed circumferentially are fixed to the side wall of the supporting plate, and the spraying barrels communicate with spraying pipes. The spray pipe penetrates through the inner wall of the mobile shell; the pressure rod is driven by the moving shell to move outside the stay cable, when the skin of the stay cable cracks, the extrusion degree of the stay cable on the pressure rod can be changed, at the moment, paint in the spraying barrel can be automatically discharged from the spraying pipe, and the stay cable can be protected in time.

Description

Technical Field

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

[0002] When maintaining cable-stayed bridges and suspension bridges, the inspection of the stay cables is an important part. After being exposed to wind and sun for a long time, the plastic outer skin of the stay cables may dry and crack. If not dealt with in time, rainwater will flow into the interior of the stay cables 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 is completed, staff need to repair the cracks in the cable sheath. If the staff cannot repair them in time, the cable is prone to further corrosion. Summary of the Invention

[0005] The purpose of this invention is to provide a bridge cable-stayed cable appearance inspection device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A bridge cable-stayed bridge appearance inspection device includes two symmetrically distributed movable housings. Each movable housing has an arc-shaped groove on its side closest to each other, and symmetrically distributed traveling wheels are installed inside each arc-shaped groove, extending into the exterior of the movable housing. A motor is fixed to the exterior of one of the movable housings, and a rotating rod is installed at the motor's output end. The rotating rod passes through the side wall of the movable housing and is rotatably connected to the side wall. The rotating rod is connected to the traveling wheels via a transmission mechanism, which drives the traveling wheels to rotate. Multiple pressure rods are circumferentially distributed through the inner wall of the movable housing, and the pressure rods are slidably connected to the inner wall of the movable housing. One end of the pressure rod located inside the movable housing is connected to the inner wall of the movable housing via a first elastic element. A support plate is fixed inside the movable housing, and multiple circumferentially distributed spray cylinders are fixed to the side wall of the support plate. Each spray cylinder is connected to a spray pipe, which passes through the inner wall of the movable housing. A pressing mechanism is installed inside each spray cylinder. When a crack appears on the surface of the cable-stayed bridge, the first elastic element releases elastic potential energy, causing the pressure rods to press the paint inside the spray cylinders through the pressing mechanism.

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

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

[0010] Preferably, the rotating assembly includes a transmission rod extending through the end of the threaded rod. A first gear is fixed to the outside of the transmission rod. A semi-circular toothed ring is rotatably connected inside the movable housing, and a clearance groove is provided on the inner wall of the movable housing for the semi-circular toothed ring to pass through. The 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 fixed to the outside of the rotating rod, and the second gear meshes with the semi-circular toothed ring. A symmetrically distributed slider is fixed to 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, and the slider is located inside the sliding groove and slidably connected to the sliding groove.

[0011] Preferably, the pushing component includes a first magnet fixed on the outer wall of the pressure rod, a second magnet fixed at the end of the transmission rod, the second magnet having the same magnetism as the first magnet, and one end of the transmission rod located inside the threaded rod being connected to the inner wall of the threaded rod through a second elastic element.

[0012] Preferably, the semi-circular toothed ring has symmetrically distributed arc-shaped retaining strips on both sides, and the arc-shaped retaining strips are fixedly 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, and 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] Preferably, a plurality of limiting rods are fixed on the inner wall of the movable housing in a circular arrangement. The limiting rods extend into the interior of the plurality of pressure rods and are slidably connected to the pressure rods. The end of each pressure rod located outside the movable housing is rotatably connected to a pressure wheel.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention moves the pressure rod outside the cable by moving the outer shell. When a crack appears in the cable skin, the degree of compression of the pressure rod by the cable 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. On the other hand, the paint can play a protective role for the cable in time, thereby preventing further corrosion of the cable. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the external structure of the movable outer shell in an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the internal structure of the movable outer shell in an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the pressure rod connection structure in an embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the connection structure between the first gear and the semi-circular gear ring in an embodiment of the present invention.

[0019] Figure 5 This is a cross-sectional view of the internal structure of the spray gun in an embodiment of the present invention.

[0020] In the diagram: 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

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0023] In one embodiment, see Figure 1 , Figure 2 , Figure 3 and Figure 4 A bridge cable-stayed bridge appearance inspection device includes two symmetrically distributed movable housings 1. Each movable housing 1 has an arc-shaped groove 515 on its side closest to each other. Symmetrically distributed traveling wheels 2 are installed inside each arc-shaped groove 515, extending into the exterior of the movable housing 1. A motor 3 is fixed to the exterior of one of the movable housings 1. A rotating rod 9 is installed at the output end of the motor 3, penetrating the side wall of the movable housing 1 and rotatably connected to it. The rotating rod 9 is connected to the traveling wheel 2 via a transmission mechanism 4, which drives the traveling wheel 2 to rotate. A through-wall is also present on the inner wall of the movable housing 1. Multiple pressure rods 8 are arranged in a circular pattern and are slidably connected to the inner wall of the movable housing 1. One end of the pressure rod 8 located inside the movable housing 1 is connected to the inner wall of the movable housing 1 through a first elastic element 11. A support plate 7 is fixed inside the movable housing 1, and multiple spray cylinders 6 are arranged in a circular pattern on the side wall of the support plate 7. The spray cylinders 6 are connected to a spray pipe 13, which penetrates the inner wall of the movable housing 1. A pressing mechanism 5 is provided inside the spray cylinder 6. When a crack appears on the surface of the cable, the first elastic element 11 releases elastic potential energy, causing the pressure rod 8 to press the paint inside the spray cylinder 6 through the pressing mechanism 5.

[0024] In this embodiment, when inspecting the appearance of the stay cable, two movable housings 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. 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, so that the movable housing 1 can walk outside the stay cable. When cracks appear in the stay cable skin, the pressure of the stay cable on the pressure rod 8 is reduced, and the pressure rod... 8 moves towards the inside of the crack under the action of the first elastic element 11, which can be a spring. After the pressure rod 8 has moved, the extrusion mechanism 5 extrudes the paint inside the spray tube 6, so that the paint inside the spray tube 6 can be discharged from the nozzle 13. As the moving outer shell 1 continues to move, the paint will be accurately sprayed inside the crack, thereby achieving the purpose of detection. 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 tube 6 through the extrusion mechanism 5. 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 in time. On the other hand, the paint can play a protective role for the cable in time, thereby avoiding further corrosion of the cable.

[0025] Please see Figure 2 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.

[0026] 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.

[0027] Please see Figure 5 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.

[0028] 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.

[0029] Please see Figure 2 , Figure 3 , Figure 4 and Figure 5The rotating assembly includes a transmission rod 56 that passes 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. 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 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.

[0030] 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.

[0031] Please see Figure 4 and Figure 5 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 element 59.

[0032] 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.

[0033] Please see Figure 3 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 housing 1. The semi-circular toothed ring 513 has arc-shaped grooves 515 on its side walls. The side walls of the arc-shaped retaining strips 514 are located inside the arc-shaped grooves 515 and are slidably connected to the arc-shaped grooves 515.

[0034] By using the arc-shaped retaining strip 514 to limit the semi-circular toothed ring 513, the stability of the semi-circular toothed ring 513 during rotation can be effectively improved.

[0035] Please see Figure 3 The inner wall of the movable housing 1 is fixed with a plurality of limiting rods 10 arranged in a circular pattern. The limiting rods 10 extend into the interior of a plurality of pressure rods 8 and are slidably connected to the pressure rods 8. The pressure rods 8 are rotatably connected to a pressure wheel 12 at one end located outside the movable housing 1.

[0036] Limiting the pressure rod 8 by using the limiting rod 10 can effectively improve the stability of the pressure rod 8 when it moves. The setting of the pressure wheel 12 can reduce the friction between the pressure rod 8 and the cable, thereby avoiding the phenomenon that the pressure rod 8 will be stuck at the crack of the cable skin.

[0037] Working Principle: When inspecting the appearance of the stay cable, the device places two movable housings 1 on the outside of the stay cable and fixes them 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 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 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 housings 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 moves towards the inside of the crack. While moving, the first magnet 512 moves, and 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, 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 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 slide groove 58. 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. 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.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for inspecting the appearance of bridge stay cables, comprising two symmetrically distributed movable housings; characterized in that, Each of the movable outer shells has an arc-shaped groove on one side that is close to each other. Symmetrically distributed wheels are installed inside each arc-shaped groove, extending into the exterior of the movable outer shell. A motor is fixed to the exterior of one of the movable outer shells, and a rotating rod is installed at the motor's output end. The rotating rod passes through the side wall of the movable outer shell and is rotatably connected to the side wall. The rotating rod is connected to the wheels via a transmission mechanism, which drives the wheels to rotate. Multiple pressure rods are circumferentially distributed through the inner wall of the movable outer shell, and are slidably connected to the inner wall. One end of the pressure rod inside the movable outer shell is connected to the inner wall via a first elastic element. A support plate is fixed inside the movable outer shell, and multiple spray tubes are circumferentially distributed on the side wall of the support plate. Each spray tube is connected to a spray pipe, which passes through the inner wall of the movable outer shell. A pressing mechanism is installed inside each spray tube. When a crack appears on the surface of the cable, the first elastic element releases elastic potential energy, causing the pressure rods to press the paint inside the spray tubes through the pressing mechanism.

2. The bridge cable-stayed cable appearance inspection device according to claim 1, characterized in that, The transmission mechanism includes support blocks fixed inside the movable housing and symmetrically distributed. A rotating shaft is rotatably connected between the support blocks. The rotating shaft passes through the walking wheel and is fixedly connected to the walking wheel. A first bevel gear is fixed to the outside of the rotating shaft, and a second bevel gear is fixed to the outside of the rotating rod. The first bevel gear and the second bevel gear mesh with each other.

3. The bridge cable-stayed cable appearance inspection device according to claim 1, characterized in that, The extrusion mechanism includes a piston disposed inside the spraying cylinder, a threaded sleeve fixedly connected to the piston, symmetrically distributed limiting blocks fixed on the outer wall of the threaded sleeve, symmetrically distributed limiting grooves on the inner wall of the spraying cylinder, the end of the limiting block located inside the limiting groove and slidably connected to the limiting groove, wherein a threaded rod is threadedly connected to the end of the threaded sleeve away from the piston, the threaded rod penetrates the side wall of the extraction cylinder and is connected to a rotating assembly, the rotating assembly being used to drive the threaded rod to rotate.

4. The bridge cable-stayed bridge appearance inspection device according to claim 3, characterized in that, The rotating assembly includes a transmission rod passing through the end of the threaded rod. A first gear is fixed to the outside of the transmission rod. A semi-circular toothed ring is rotatably connected inside the movable housing, and a clearance groove is provided on the inner wall of the movable housing for the semi-circular toothed ring to pass through. The 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 fixed to the outside of the rotating rod, and the second gear meshes with the semi-circular toothed ring. A symmetrically distributed slider is fixed to 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, and the slider is located inside the sliding groove and is slidably connected to the sliding groove.

5. The bridge cable-stayed cable appearance inspection device according to claim 4, characterized in that, The pushing component includes a first magnet fixed on the outer wall of the pressure rod, and a second magnet fixed at 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.

6. A bridge cable-stayed bridge appearance inspection device according to claim 4 or 5, characterized in that, The semi-circular toothed ring has symmetrically distributed arc-shaped retaining strips on both sides. The arc-shaped retaining strips are fixedly 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.

7. The bridge cable-stayed cable appearance inspection device according to claim 1, characterized in that, Multiple limiting rods are fixed on the inner wall of the movable housing in a circular arrangement. The limiting rods extend into the interior of multiple pressure rods and are slidably connected to the pressure rods. Each pressure rod has a pressure wheel rotatably connected to one end outside the movable housing.

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