Laser measuring device for thickness of corrosion-resistant layer of concrete of long-span bridge

Abstract

The application relates to the technical field of laser measurement, and discloses a large-span bridge concrete corrosion-resistant layer thickness laser measuring device, which comprises a moving vehicle body, a laser measuring instrument and a distance sensor, the moving vehicle body moves along the length direction of the bridge, a vertical driving mechanism is fixedly connected to the moving vehicle body, a supporting table is fixedly connected to the driving end of the vertical driving mechanism, symmetrical overturning assemblies are connected to the surface of the supporting table, and a transverse driving mechanism is arranged between the two groups of overturning assemblies on the supporting table; the moving vehicle body is used for realizing flexible movement along the length direction of the bridge, the vertical driving mechanism drives the supporting table to ascend and descend, the detection arm is turned over from the supporting table to the two sides of the bridge through the overturning assembly, the distance adjusting mechanism composed of the telescopic detection arm and multiple groups of parallel arranged stretching rods is combined, the distance adjusting mechanism can realize omnibearing coverage detection on complex parts such as the side surface and the bottom surface of the bridge, and the problem of poor reachability of the traditional device is effectively solved.

Description

Technical Field

[0001] This invention belongs to the field of laser measurement technology, specifically relating to a laser measurement device for the thickness of the corrosion-resistant concrete layer of long-span bridges. Background Technology

[0002] In transportation infrastructure construction, long-span bridges serve as key hub projects, operating under the combined effects of complex natural environments and traffic loads for extended periods. The durability of the bridge's concrete structure directly impacts its service life and operational safety, while the corrosion-resistant concrete layer, as the core protective barrier against external erosion, has its thickness uniformity and compliance with standards as crucial indicators for ensuring the stability of the bridge structure.

[0003] With the development of laser measurement technology, laser measuring instruments have been gradually applied to the field of bridge engineering inspection due to their advantages such as high measurement accuracy, fast response speed and non-contact detection. However, when the existing thickness measuring devices based on laser measuring instruments are used for the inspection of long-span bridges, the limited accessibility and adjustment capability of their detection mechanism make it difficult to flexibly adjust the position and angle of the laser measuring instrument, making it difficult to accurately align with the detection target of complex parts of the bridge, resulting in limited detection range and insufficient data integrity. Summary of the Invention

[0004] The purpose of this invention is to provide a laser measurement device with a simple structure and reasonable design in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions: This invention provides a laser measurement device for the thickness of the corrosion-resistant concrete layer of a long-span bridge, comprising a mobile vehicle, a laser measuring instrument, and a distance sensor. The mobile vehicle moves along the length of the bridge. A vertical drive mechanism is fixedly connected to the mobile vehicle. A support platform is fixedly connected to the drive end of the vertical drive mechanism. Symmetrically arranged flipping components are connected to the surface of the support platform. A transverse drive mechanism is provided between the two sets of flipping components on the support platform. The transverse drive mechanism simultaneously drives the two sets of flipping components to move, thereby causing the detection arm to flip from the support platform to both sides of the bridge. A retractable detection arm is connected to the end of the flipping component away from the transverse drive mechanism. A distance adjustment mechanism is provided at the end of the detection arm away from the flipping component. The end of the distance adjustment mechanism away from the detection arm is the measuring end. The laser measuring instrument and the distance sensor are installed at the measuring end of the distance adjustment mechanism. After the distance adjustment mechanism, in conjunction with the distance sensor, adjusts the measuring end to the measuring position, the laser measuring instrument measures the thickness of the corrosion-resistant concrete layer.

[0006] As a further optimization of the present invention, the support platform includes a support plate and a fixed plate connected to both sides of the moving vehicle body. The surface of the support plate is slidably connected with symmetrically arranged sleeve plates. The driving end of the vertical drive mechanism is fixedly connected to the lower surface of the support plate. The surface of the fixed plate is rotatably connected with parallel folding rods. The end of the folding rod away from the fixed plate is rotatably connected to the surface of the sleeve plate on the same side.

[0007] As a further optimization of the present invention, the transverse driving mechanism includes a driving assembly 1 disposed on the surface of the support plate. The driving end of the driving assembly 1 is connected to symmetrically arranged telescopic rods. The ends of the two sets of telescopic rods away from the driving assembly 1 are each connected to threaded rods. The ends of the threaded rods away from the telescopic rods are rotatably connected to a sleeve plate disposed on the same side. The two sets of threaded rods are symmetrically arranged. The surface of the threaded rods is threadedly connected to a driving block. A limiting rod passes through the driving block. The two ends of the limiting rod are fixedly connected to the sleeve plate disposed on the same side. The flipping assembly is connected to the driving block.

[0008] As a further optimization of the present invention, the drive assembly includes a rotating motor, a mounting bracket is fixedly connected to the surface of the support plate, and a worm gear and a worm are rotatably connected to the surface of the mounting bracket. One end of the worm is connected to the drive end of the rotating motor, and the ends of the two sets of telescopic rods away from the sleeve plate are coaxially connected to both sides of the worm gear.

[0009] As a further optimization of the present invention, the detection arm includes a fixed arm and a movable arm. The surface of the fixed arm is provided with a groove. A rotary motor is fixedly connected to the end of the fixed arm away from the flipping component. The drive end of the rotary motor extends into the groove and is fixedly connected to a helical rod. A slider is threadedly connected to the surface of the helical rod. The movable arm is fixedly connected to the surface of the slider. The end of the helical rod away from the rotary motor is rotatably connected to the inner wall of the groove. The slider slides along the inner wall of the groove.

[0010] As a further optimization of the present invention, the flipping assembly includes an outer transmission rod and a bent inner transmission rod, an outer flipping rod, and an inner flipping rod. One end of the outer transmission rod and the inner transmission rod are rotatably connected to the surface of the sleeve plate. The end of the outer transmission rod away from the sleeve plate is connected to one end of the inner flipping rod via a rotating shaft. The end of the inner transmission rod away from the sleeve plate is rotatably connected to the end of the outer flipping rod. The ends of the outer flipping rod and the inner flipping rod away from the sleeve plate are rotatably connected to the surface of the detection arm. The bent portion of the inner transmission rod is rotatably connected to the surface of the inner flipping rod. A driving groove is formed on the surface of the driving block. One end of the rotating shaft extends into the driving groove and moves along the inner wall of the driving groove.

[0011] As a further optimization of the present invention, the end of the detection arm away from the flipping assembly is fixedly connected to a mounting plate. The distance adjustment mechanism is connected to the mounting plate. The distance adjustment mechanism includes multiple sets of parallel extension rods 1 and 2. A transmission plate is provided between two adjacent sets of parallel extension rods 1 and 2. The ends of extension rods 1 and 2 are rotatably connected to the surface of the corresponding transmission plate. A drive motor is fixedly connected to the surface of the mounting plate. The end of the extension rod 1 closest to the drive motor away from the transmission plate is fixedly connected to the drive end of the drive motor. The end of the extension rod 1 parallel to the drive motor away from the transmission plate is rotatably connected to the surface of the mounting plate. A limiting plate is slidably connected to the surface of each set of transmission plates. The surface of the limiting plate has symmetrically arranged limiting grooves. A limiting block is provided in the limiting groove. Two sets of limiting blocks are fixedly connected to the surfaces of the extension rods 1 and 2 that are close to each other on the corresponding transmission plates. The end of the parallel extension rod 2 furthest from the drive motor away from the transmission plate is the measuring end.

[0012] As a further optimization of the present invention, the distance adjustment mechanism further includes a detection frame, and the end of one of the two parallel extension rods furthest from the drive motor and furthest from the transmission plate is rotatably connected to the surface of the detection frame. A drive motor is fixedly connected to the detection frame, and a linear drive component is connected to the drive end of the drive motor. The laser measuring instrument and the distance sensor are both connected to the drive end of the linear drive component.

[0013] As a further optimization of the present invention, the first driving component is a transmission component, which includes a rack and a gear that mesh with each other. The lower end of the rack is fixedly connected to the surface of the moving vehicle body. The surface of the support plate is connected to the second mounting bracket. The gear is rotatably connected to the surface of the second mounting bracket. The ends of the two sets of telescopic rods away from the sleeve plate are coaxially connected to the two sides of the gear. A vertical rod is fixedly connected to the second mounting bracket. A tension rope is threaded through the surface of the vertical rod. The two ends of the tension rope are fixedly connected to the surfaces of the two sets of sleeve plates respectively.

[0014] As a further optimization of the present invention, the surface of the support plate is provided with a ratchet corresponding to the sleeve plate, and the surfaces of both sets of sleeve plates are provided with slots. A ratchet tooth is slidably connected in the slot, and a guide rod is rotatably connected to the upper surface of the ratchet tooth. A mating plate is fixedly connected to the surface of the sleeve plate, and a locking groove is provided on the surface of the mating plate. The upper end of the guide rod passes through the locking groove. When the ratchet tooth and the ratchet tooth are engaged, a locking block is fixedly connected to the surface of the guide rod located in the locking groove. A return spring is sleeved on the outside of the guide rod. The lower end of the return spring is connected to the ratchet tooth, and the upper end of the return spring is connected to the inner top surface of the mating plate.

[0015] The beneficial effects of this invention are as follows: This invention enables flexible movement along the length of the bridge by moving the vehicle body, and drives the support platform to rise and fall with the vertical drive mechanism. Then, the detection arm is flipped from the support platform to both sides of the bridge by the flipping component. Combined with the telescopic detection arm and the distance adjustment mechanism composed of multiple sets of parallel extension rods, it can achieve all-round coverage detection of complex parts such as the sides and bottom of the bridge, effectively solving the problem of poor accessibility of traditional devices. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the flipping component in the open state according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the support platform structure according to Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the transverse drive mechanism structure according to Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the detection arm structure according to Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the flip component structure according to Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the distance adjustment component structure according to Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the limiting plate structure according to Embodiment 1 of the present invention; Figure 9 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention; Figure 10 This is a schematic diagram of the transmission component structure according to Embodiment 2 of the present invention; Figure 11 This is a schematic diagram of the ratchet and ratchet structure of Embodiment 2 of the present invention.

[0017] In the diagram: 1. Moving vehicle body; 2. Laser measuring instrument; 3. Distance sensor; 4. Tilting assembly; 41. Outer transmission rod; 42. Inner transmission rod; 43. Outer tilting rod; 44. Inner tilting rod; 45. Rotating shaft; 46. Drive slot; 5. Lateral drive mechanism; 51. Drive assembly one; 511. Rotary motor; 512. Mounting bracket one; 513. Worm gear; 514. Worm; 52. Telescopic rod; 521. Fixed rod; 522. Movable rod; 53. Threaded rod; 54. Drive block; 55. Limiting rod; 6. Distance adjustment mechanism; 61. Extension rod one; 62. Extension rod two; 63. Transmission plate; 64. Drive motor; 65. Limiting rod. 66. Plate making; 67. Restriction groove; 68. Restriction block; 69. Detection frame; 610. Drive motor; 7. Linear drive component; 7. Support platform; 71. Support plate; 72. Fixing plate; 73. Sleeve plate; 74. Folding rod; 8. Detection arm; 81. Fixed arm; 82. Movable arm; 9. Transmission assembly; 91. Rack; 92. Gear; 93. Mounting frame two; 94. Vertical rod; 95. Tensioning rope; 10. Vertical drive mechanism; 11. Rotary motor; 12. Helical rod; 13. Slider; 14. Mounting plate; 15. Ratchet; 16. Ratchet tooth; 17. Guide rod; 18. Mating plate; 19. Locking block; 20. Return spring. Detailed Implementation

[0018] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0019] Example 1; refer to Figure 1 and Figure 2 The structure shown is a laser measurement device for the thickness of the concrete corrosion-resistant layer of a long-span bridge, including a mobile vehicle 1, a laser measuring instrument 2, and a distance sensor 3. The mobile vehicle 1 moves along the length of the bridge. A vertical drive mechanism 10 is fixedly connected to the mobile vehicle 1. A support platform 7 is fixedly connected to the drive end of the vertical drive mechanism 10. Symmetrically arranged flipping components 4 are connected to the surface of the support platform 7. A transverse drive mechanism 5 is set on the support platform 7 between the two sets of flipping components 4. The transverse drive mechanism 5 simultaneously drives the two sets of flipping components 4 to move, so as to flip the detection arm 8 from the support platform 7 to both sides of the bridge. A telescopic detection arm 8 is connected to the end of the flipping component 4 away from the transverse drive mechanism 5. A distance adjustment mechanism 6 is set at the end of the detection arm 8 away from the flipping component 4. The end of the distance adjustment mechanism 6 away from the detection arm 8 is the measuring end. The laser measuring instrument 2 and the distance sensor 3 are installed at the measuring end of the distance adjustment mechanism 6. After the distance adjustment mechanism 6 adjusts the measuring end to the measuring position with the distance sensor 3, the laser measuring instrument 2 measures the thickness of the concrete corrosion-resistant layer.

[0020] It should be noted that the vertical drive mechanism 10 can be any kind of mechanical structure capable of linear motion, specifically, it can be an electric push rod, a hydraulic cylinder, a pneumatic cylinder, etc.

[0021] refer to Figure 3 and Figure 4 The structure shown includes a support platform 71 and a fixed plate 72 connected to both sides of the moving vehicle body 1. The surface of the support platform 71 is slidably connected to symmetrically arranged sleeve plates 73. The driving end of the vertical drive mechanism 10 is fixedly connected to the lower surface of the support platform 71. The surface of the fixed plate 72 is rotatably connected to a parallel folding rod 74. The end of the folding rod 74 away from the fixed plate 72 is rotatably connected to the surface of the sleeve plate 73 on the same side.

[0022] In actual use, when the vertical drive mechanism 10 drives the support plate 71 to move upward, with the cooperation of the folding rod 74, the two sets of sleeve plates 73 will move along the surface of the support plate 71 to the sides away from the moving vehicle body 1. This is the unfolded state of the support platform 7, and the reverse is the folded state of the support platform 7.

[0023] Furthermore, the transverse drive mechanism 5 includes a drive assembly 51 disposed on the surface of the support plate 71. The drive end of the drive assembly 51 is connected to symmetrically arranged telescopic rods 52. The ends of the two sets of telescopic rods 52 away from the drive assembly 51 are each connected to threaded rods 53. The ends of the threaded rods 53 away from the telescopic rods 52 are rotatably connected to the sleeve plate 73 disposed on the same side. The two sets of threaded rods 53 are symmetrically arranged. The surface of the threaded rods 53 is threadedly connected to a drive block 54. A limit rod 55 passes through the drive block 54. The two ends of the limit rod 55 are fixedly connected to the sleeve plate 73 disposed on the same side. The flipping assembly 4 is connected to the drive block 54.

[0024] Furthermore, the drive assembly 51 includes a rotary motor 511, a mounting bracket 512 is fixedly connected to the surface of the support plate 71, and a worm gear 513 and a worm 514 are rotatably connected to the surface of the mounting bracket 512. One end of the worm 514 is connected to the drive end of the rotary motor 511, and the ends of the two sets of telescopic rods 52 away from the sleeve plate 73 are coaxially connected to both sides of the worm gear 513.

[0025] Specifically, the telescopic rod 52 includes a fixed rod 521 and a movable rod 522. The fixed rod 521 of the two sets of telescopic rods 52 is coaxially connected to the worm gear 513. The movable rod 522 is slidably connected inside the fixed rod 521. The end of the movable rod 522 away from the fixed rod 521 is connected to the threaded rod 53 on the same side. When the vertical drive mechanism 10 drives the support platform 7 to unfold, the telescopic rod 52 extends. When the vertical drive mechanism 10 drives the support platform 7 to fold, the telescopic rod 52 shortens.

[0026] In practical use, the rotating motor 511 drives the worm gear 514 and drives the worm wheel 513 to rotate. The worm wheel 513 drives the two sets of threaded rods 53 to rotate, thereby further driving the drive block 54 to slide along the surface of the limit rod 55. The rotating motor 511 can be a stepper motor, servo motor, etc.

[0027] refer to Figure 5 As shown, the detection arm 8 includes a fixed arm 81 and a movable arm 82. The surface of the fixed arm 81 is provided with a groove. A rotary motor 11 is fixedly connected to the end of the fixed arm 81 away from the flipping assembly 4. The drive end of the rotary motor 11 extends into the groove and is fixedly connected to a screw rod 12. A slider 13 is threadedly connected to the surface of the screw rod 12. The movable arm 82 is fixedly connected to the surface of the slider 13. The end of the screw rod 12 away from the rotary motor 11 is rotatably connected to the inner wall of the groove. The slider 13 slides along the inner wall of the groove.

[0028] It should be noted that the rotary motor 11 can be a stepper motor, servo motor, etc. In actual use, the rotary motor 11 drives the screw rod 12 to rotate, causing the slider 13 to slide along the inner wall of the groove. The slider 13 drives the movable arm 82 to move, so as to realize the extension and retraction of the detection arm 8.

[0029] refer to Figure 3 and Figure 6 The structure shown includes an outer transmission rod 41 and a bent inner transmission rod 42, an outer flip rod 43, and an inner flip rod 44. One end of the outer transmission rod 41 and the inner transmission rod 42 are rotatably connected to the surface of the sleeve plate 73. The end of the outer transmission rod 41 away from the sleeve plate 73 is connected to one end of the inner flip rod 44 via a rotating shaft 45. The end of the inner transmission rod 42 away from the sleeve plate 73 is rotatably connected to the end of the outer flip rod 43. The ends of the outer flip rod 43 and the inner flip rod 44 away from the sleeve plate 73 are rotatably connected to the surface of the detection arm 8. The bent part of the inner transmission rod 42 is rotatably connected to the surface of the inner flip rod 44. A driving groove 46 is provided on the surface of the driving block 54. One end of the rotating shaft 45 extends into the driving groove 46 and moves along the inner wall of the driving groove 46.

[0030] Among them, the ends of the outer flip rod 43 and the inner flip rod 44 away from the sleeve plate 73 are rotatably connected to the surface of the fixed arm 81 of the detection arm 8; during the movement of the flipping assembly 4, the part from the end of the inner transmission rod 42 rotatably connected to the sleeve plate 73 to the bend is always parallel to the outer transmission rod 41; the bend of the inner transmission rod 42 is rotatably connected between the bend of the inner flip rod 44 and the end of the inner flip rod 44 near the outer transmission rod 41.

[0031] It should be noted that the flipping component 4 includes an unfolded state and a folded state. When the detection arm 8 is above the support platform 7, the flipping component 4 is in the folded state. When the detection arm 8 is on the side of the support platform 7 (which is also the outer side of the bridge), the flipping component 4 is in the unfolded state. In actual use, when the drive component 51 drives the drive block 54 to move from the side close to the telescopic rod 52 to the side away from the telescopic rod 52, it will drive the rotating shaft 45 to move along the inner wall of the drive groove 46, thereby causing the outer transmission rod 41 and the inner transmission rod 42 to rotate around the part connected to the sleeve plate 73. With the cooperation of the outer flip rod 43 and the inner flip rod 44, the detection arm 8 is flipped 180 degrees from above the support platform 7 and then moved to the outer side of the bridge.

[0032] refer to Figure 7 and Figure 8 The structure shown includes a mounting plate 14 fixedly connected to the end of the detection arm 8 furthest from the flipping assembly 4. A distance adjustment mechanism 6 is connected to the mounting plate 14. The distance adjustment mechanism 6 includes multiple sets of parallel extension rods 61 and 62. A transmission plate 63 is provided between adjacent sets of parallel extension rods 61 and 62. The ends of extension rods 61 and 62 are rotatably connected to the surfaces of the corresponding transmission plates 63. A drive motor 64 is fixedly connected to the surface of the mounting plate 14. The end of the extension rod 61 closest to the drive motor 64 furthest from the transmission plate 63 is fixedly connected to the drive motor 64. The drive end of the motor 64, the extension rod 61 connected to the drive motor 64, is rotatably connected to the surface of the mounting plate 14 at the end of the extension rod 61 that is away from the transmission plate 63. Each set of transmission plates 63 has a limiting plate 65 that is slidably connected to its surface. The limiting plate 65 has symmetrically arranged limiting grooves 66 on its surface. A limiting block 67 is provided in the limiting groove 66. Two sets of limiting blocks 67 are fixedly connected to the surfaces of the extension rod 61 and extension rod 62 that are close to each other on the corresponding transmission plates 63. The end of the parallel extension rod 62 that is farthest from the drive motor 64 is the measuring end.

[0033] Furthermore, the distance adjustment mechanism 6 also includes a detection frame 68. A set of parallel extension rods 62, which are furthest from the drive motor 64, are rotatably connected to the surface of the detection frame 68 at the end furthest from the transmission plate 63. A transmission motor 69 is fixedly connected to the detection frame 68. A linear drive component 610 is connected to the drive end of the transmission motor 69. The laser measuring instrument 2 and the distance sensor 3 are both connected to the drive end of the linear drive component 610.

[0034] Specifically, the mounting plate 14 is connected to the side surface of the movable arm 82 away from the fixed arm 81; the portion of the limiting block 67 located within the limiting groove 66 is cylindrical, so the limiting block 67 can slide along the inside of the limiting groove 66 or rotate within the limiting groove 66; the linear drive 610 can be an electric push rod, a hydraulic cylinder, a pneumatic cylinder, etc.; the transmission motor 69 can be a stepper motor, a servo motor, etc.; the linear drive 610 is used to adjust the distance between the laser measuring instrument 2 and the distance sensor 3 and the bridge surface; the transmission motor 69 is used to adjust the angle of the laser measuring instrument 2 and the distance sensor 3, which cooperates with the telescopic detection arm 8 to enable the laser measuring device to detect the concrete corrosion resistance thickness of the bottom and sides of the bridge.

[0035] It should be noted that, in the initial state, the adjacent extension rod 1 61 and extension rod 2 62 are in a "V" shape. When the drive motor 64 drives the extension rod 1 61 connected to it to rotate, under the cooperation of the limiting groove 66 and the limiting block 67, it will drive the other extension rod 1 61 and extension rod 2 62 to move synchronously, thereby adjusting the position of the laser measuring instrument 2 and the distance sensor 3 installed at the measuring end.

[0036] Example 2; This embodiment further improves upon Embodiment 1 by replacing the drive assembly 51 with the transmission assembly 9. This allows the vertical drive mechanism 10, in conjunction with the lateral drive mechanism 5, to simultaneously drive the flipping assembly 4 to flip the detection arm 8 as the vertical drive support plate 71 moves up and down. For details, please refer to... Figure 9 and Figure 10 The structure shown includes a transmission assembly 9 comprising a rack 91 and a gear 92 that mesh with each other. The lower end of the rack 91 is fixedly connected to the surface of the moving vehicle body 1. A mounting bracket 93 is connected to the surface of the support plate 71. The gear 92 is rotatably connected to the surface of the mounting bracket 93. The ends of two sets of telescopic rods 52 away from the sleeve plate 73 are coaxially connected to the two sides of the gear 92. A vertical rod 94 is fixedly connected to the mounting bracket 93. A tension rope 95 is threaded through the surface of the vertical rod 94. The two ends of the tension rope 95 are fixedly connected to the surfaces of the two sets of sleeve plates 73, respectively.

[0037] Among them, the fixing rod 521 of the two sets of telescopic rods 52 is coaxially connected to the gear 92; the tensioning rope 95 is a steel wire rope.

[0038] In actual use, when the vertical drive mechanism 10 drives the support plate 71 to move upward, it drives the gear 92 to move upward synchronously. With the cooperation of the rack 91, the upward-moving gear 92 will rotate, thereby driving the telescopic rod 52 and the threaded rod 53 to rotate.

[0039] refer to Figure 9 and Figure 11As shown in the partial structure, the surface of the support plate 71 is provided with a ratchet 15 corresponding to the sleeve plate 73. The surfaces of both sets of sleeve plates 73 are provided with slots, and ratchet teeth 16 are slidably connected in the slots. A guide rod 17 is rotatably connected to the upper surface of the ratchet teeth 16. A mating plate 18 is fixedly connected to the surface of the sleeve plate 73. A locking groove is provided on the surface of the mating plate 18. The upper end of the guide rod 17 passes through the locking groove. When the ratchet teeth 16 and the ratchet 15 are engaged, a locking block 19 is fixedly connected to the surface of the guide rod 17 located in the locking groove. A return spring 20 is sleeved on the outside of the guide rod 17. The lower end of the return spring 20 is connected to the ratchet teeth 16, and the upper end of the return spring 20 is connected to the inner top surface of the mating plate 18.

[0040] It should be noted that by setting the ratchet 16 and the ratchet 15 to restrict the movement of the sleeve 73, and by setting the tension rope 95, the stability of the entire support platform 7 is further improved.

[0041] In actual use, when the unfolded support platform 7 needs to be folded, pull the guide rod 17 upward. The upward guide rod 17 drives the ratchet 16 away from the ratchet 15. After the locking block 19 is completely moved out of the locking groove, rotate the guide rod 17 so that the locking block 19 abuts against the upper surface of the mating plate 18. At this time, the vertical drive mechanism 10 can be activated to drive the support plate 71 to move downward so that the sleeve plate 73 moves closer to the side of the moving vehicle body 1.

[0042] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A laser measuring device for the thickness of the corrosion-resistant concrete layer of long-span bridges, characterized in that, The system includes a mobile vehicle, a laser measuring instrument, and a distance sensor. The mobile vehicle moves along the length of the bridge. A vertical drive mechanism is fixedly connected to the mobile vehicle. A support platform is fixedly connected to the drive end of the vertical drive mechanism. Symmetrically arranged flipping components are connected to the surface of the support platform. A transverse drive mechanism is set on the support platform between the two sets of flipping components. The transverse drive mechanism simultaneously drives the two sets of flipping components to move, causing the detection arm to flip from the support platform to both sides of the bridge. A retractable detection arm is connected to the end of the flipping component away from the transverse drive mechanism. A distance adjustment mechanism is set at the end of the detection arm away from the flipping component. The end of the distance adjustment mechanism away from the detection arm is the measuring end. The laser measuring instrument and the distance sensor are installed at the measuring end of the distance adjustment mechanism. After the distance adjustment mechanism, in conjunction with the distance sensor, adjusts the measuring end to the measuring position, the laser measuring instrument measures the thickness of the concrete corrosion-resistant layer.

2. The laser measurement device for the thickness of the corrosion-resistant concrete layer of long-span bridges according to claim 1, characterized in that: The support platform includes a support plate and a fixed plate connected to both sides of the moving vehicle body. Symmetrically arranged sleeve plates are slidably connected to the surface of the support plate. The driving end of the vertical drive mechanism is fixedly connected to the lower surface of the support plate. Parallel folding rods are rotatably connected to the surface of the fixed plate. The end of the folding rod away from the fixed plate is rotatably connected to the surface of the sleeve plate on the same side.

3. The laser measurement device for the thickness of the corrosion-resistant concrete layer of a long-span bridge according to claim 2, characterized in that: The lateral drive mechanism includes a drive assembly 1 disposed on the surface of the support plate. The drive end of the drive assembly 1 is connected to symmetrically arranged telescopic rods. The ends of the two sets of telescopic rods away from the drive assembly 1 are each connected to threaded rods. The ends of the threaded rods away from the telescopic rods are rotatably connected to a sleeve plate disposed on the same side. The two sets of threaded rods are symmetrically arranged. The surface of the threaded rods is threadedly connected to a drive block. A limiting rod passes through the drive block. The two ends of the limiting rod are fixedly connected to the sleeve plate disposed on the same side. The flipping assembly is connected to the drive block.

4. The laser measurement device for the thickness of the corrosion-resistant concrete layer of a long-span bridge according to claim 3, characterized in that: The drive assembly includes a rotating motor. A mounting bracket is fixedly connected to the surface of the support plate. A worm gear and a worm are rotatably connected to the surface of the mounting bracket. One end of the worm is connected to the drive end of the rotating motor. The ends of two sets of telescopic rods away from the sleeve plate are coaxially connected to both sides of the worm gear.

5. The laser measurement device for the thickness of the corrosion-resistant concrete layer of a long-span bridge according to claim 4, characterized in that: The detection arm includes a fixed arm and a movable arm. The surface of the fixed arm is provided with a groove. A rotary motor is fixedly connected to the end of the fixed arm away from the flipping component. The drive end of the rotary motor extends into the groove and is fixedly connected to a helical rod. A slider is threadedly connected to the surface of the helical rod. The movable arm is fixedly connected to the surface of the slider. The end of the helical rod away from the rotary motor is rotatably connected to the inner wall of the groove. The slider slides along the inner wall of the groove.

6. The laser measuring device for the thickness of the corrosion-resistant concrete layer of a long-span bridge according to claim 5, characterized in that: The flipping assembly includes an outer transmission rod and a bent inner transmission rod, an outer flipping rod, and an inner flipping rod. One end of the outer transmission rod and the inner transmission rod are rotatably connected to the surface of the sleeve plate. The end of the outer transmission rod away from the sleeve plate is connected to one end of the inner flipping rod via a rotating shaft. The end of the inner transmission rod away from the sleeve plate is rotatably connected to the end of the outer flipping rod. The ends of the outer flipping rod and the inner flipping rod away from the sleeve plate are rotatably connected to the surface of the detection arm. The bent portion of the inner transmission rod is rotatably connected to the surface of the inner flipping rod. A driving groove is formed on the surface of the driving block. One end of the rotating shaft extends into the driving groove and moves along the inner wall of the driving groove.

7. The laser measurement device for the thickness of the corrosion-resistant concrete layer of long-span bridges according to claim 1, characterized in that: The end of the detection arm furthest from the flipping assembly is fixedly connected to a mounting plate. The distance adjustment mechanism is connected to the mounting plate. The distance adjustment mechanism includes multiple sets of parallel extension rods 1 and 2. A transmission plate is provided between two adjacent sets of parallel extension rods 1 and 2. The ends of extension rods 1 and 2 are rotatably connected to the surface of the corresponding transmission plate. A drive motor is fixedly connected to the surface of the mounting plate. The end of the extension rod 1 closest to the drive motor furthest from the transmission plate is fixedly connected to the drive end of the drive motor. The end of the extension rod 1 parallel to the drive motor furthest from the transmission plate is rotatably connected to the surface of the mounting plate. A limiting plate is slidably connected to the surface of each set of transmission plates. The surface of the limiting plate has symmetrically arranged limiting grooves. A limiting block is provided in the limiting groove. Two sets of limiting blocks are fixedly connected to the surfaces of the extension rods 1 and 2 that are close to each other on the corresponding transmission plates. The end of the parallel extension rod 2 furthest from the drive motor furthest from the transmission plate is the measuring end.

8. The laser measurement device for the thickness of the corrosion-resistant concrete layer of a long-span bridge according to claim 7, characterized in that: The distance adjustment mechanism also includes a detection frame. A set of parallel extension rods furthest from the drive motor has one end rotatably connected to the surface of the detection frame. A drive motor is fixedly connected to the detection frame. A linear drive component is connected to the drive end of the drive motor. The laser measuring instrument and the distance sensor are both connected to the drive end of the linear drive component.

9. The laser measurement device for the thickness of the corrosion-resistant concrete layer of a long-span bridge according to claim 3, characterized in that: The first drive component is a transmission component, which includes a rack and a gear that mesh with each other. The lower end of the rack is fixedly connected to the surface of the moving vehicle body. The surface of the support plate is connected to the second mounting bracket. The gear is rotatably connected to the surface of the second mounting bracket. The ends of two sets of telescopic rods away from the sleeve plate are coaxially connected to both sides of the gear. A vertical rod is fixedly connected to the second mounting bracket. A tension rope is threaded through the surface of the vertical rod. The two ends of the tension rope are fixedly connected to the surfaces of the two sets of sleeve plates, respectively.

10. The laser measuring device for the thickness of the corrosion-resistant concrete layer of a long-span bridge according to claim 9, characterized in that: The support plate has a ratchet corresponding to the sleeve plate on its surface. Both sets of sleeve plates have slots on their surfaces. A ratchet tooth is slidably connected in the slot. A guide rod is rotatably connected to the upper surface of the ratchet tooth. A mating plate is fixedly connected to the surface of the sleeve plate. A locking groove is formed on the surface of the mating plate. The upper end of the guide rod passes through the locking groove. When the ratchet tooth engages with the ratchet, a locking block is fixedly connected to the surface of the guide rod located in the locking groove. A return spring is sleeved on the outside of the guide rod. The lower end of the return spring is connected to the ratchet tooth, and the upper end of the return spring is connected to the inner top surface of the mating plate.

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