A semi-rigid base layer asphalt pavement crack detection device

Abstract

The application relates to the technical field of asphalt pavement crack detection, in particular to a semi-rigid base asphalt pavement crack detection device, which comprises a shell, wheels, a control unit, a handrail, a cleaning assembly, a detection assembly and a driving assembly. The detection assembly comprises an inner shell, a moving plate, a detection rotating drum, a first electromagnetic module, a second electromagnetic module, a transmission module and a tension spring. The first electromagnetic module and the second electromagnetic module drive the transmission module to push the moving plate to move downwards, meanwhile, the driving assembly drives the first electromagnetic module to drive the detection rotating drum to rotate and adjust, and then the driving assembly drives the cleaning assembly to clean and detect the road surface. The application realizes that the pavement crack detection device can adopt various detection equipment to detect the cracks on the road surface and the cracks inside the road, improves the detection precision, meanwhile, provides a miniaturized detection device, reduces the detection cost, adapts to different detection environments, and improves the convenience of the detection device.

Description

Technical Field

[0001] This invention relates to the field of asphalt pavement crack detection technology, and in particular to a semi-rigid base asphalt pavement crack detection device. Background Technology

[0002] Asphalt pavement has become the most common structural form for high-grade roads in my country due to its good driving comfort, fast construction, convenient maintenance, and low cost. Compared with cement pavement, it has significant advantages. In terms of base structure, semi-rigid base layers, compared with flexible base layers, have advantages such as high load-bearing capacity, high stiffness and modulus, good slab properties, low deflection, and economical cost, and are therefore widely used in domestic asphalt pavements. However, this structure also has disadvantages such as large thermal shrinkage and drying shrinkage deformation, and susceptibility to cracking. Once cracks appear in the semi-rigid base layer, they can reflect upwards to the asphalt surface layer, inducing pavement distress. Therefore, it is necessary to conduct continuous monitoring of cracks caused by semi-rigid base layers in order to detect them in a timely manner and take appropriate remedial measures.

[0003] Existing road surface crack detection devices typically use vehicle-mounted laser detection equipment. However, laser detection has certain drawbacks. It can only detect the crack condition on the road surface, not the crack depth. In addition, vehicle-mounted laser detection equipment is relatively large, which increases the detection cost. Furthermore, it has certain limitations in terms of the detection environment. Summary of the Invention

[0004] The technical objective of this invention is to address the limitations of existing road crack detection equipment, which uses a single detection device within the same apparatus and can only detect the surface crack condition, not the crack depth. Furthermore, vehicle-mounted laser detection equipment is bulky, increasing detection costs and limiting its suitability for different environments. This invention enables the use of multiple detection devices to detect both surface and internal road cracks, improving detection accuracy. Simultaneously, it provides a miniaturized detection device, reducing costs and adapting to various detection environments to enhance convenience.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A semi-rigid base asphalt pavement crack detection device includes: a housing, wheels, a control unit, a handle, a cleaning assembly, a detection assembly, and a drive assembly;

[0007] Multiple wheels are rotatably mounted on both sides of the housing, a control unit is fixedly mounted on the top of the housing, a handle is fixedly mounted on the top of the rear end of the housing, a cleaning component is fixedly mounted on the bottom of the front end of the housing, a detection component is fixedly mounted inside the housing, and a drive component is fixedly mounted inside the housing, with the drive component connected to both the cleaning component and the drive component.

[0008] The detection assembly includes an inner shell, a movable plate, a detection rotating cylinder, a first electromagnetic module, a second electromagnetic module, a transmission module, and a tension spring.

[0009] The inner shell is fixedly installed inside the outer shell. Multiple movable plates are movably installed at the bottom of the inner shell. Multiple detection cylinders are rotatably installed inside the inner shell. The multiple detection cylinders are arranged at intervals with the multiple movable plates. Multiple first electromagnetic modules are fixedly installed on one side of the inner shell and are connected to the multiple detection cylinders. Multiple second electromagnetic modules are fixedly installed on the other side of the inner shell. Transmission modules are fixedly installed between multiple adjacent first electromagnetic modules and multiple adjacent second electromagnetic modules. Multiple tension springs are fixedly installed on the top of the multiple movable plates and the free ends of the multiple tension springs are fixedly connected to the inner wall of the top of the inner shell.

[0010] The first and second electromagnetic modules drive the transmission module to push the moving plate downward. At the same time, the drive component drives the first electromagnetic module to rotate and adjust the detection drum. Subsequently, the drive component drives the sweeping component to sweep and detect the road surface.

[0011] As a preferred embodiment of the semi-rigid base asphalt pavement crack detection device of the present invention, the detection drum is a polyhedral structure, and multiple detection sensors are respectively installed on multiple faces of the detection drum. The detection sensors on different faces are of different types. Any face of the detection drum is the bottom face. A rotating shaft is fixedly installed inside the detection drum. One end of the rotating shaft is rotatably connected to the inner wall of the inner shell, and the other end penetrates the inner wall of the inner shell and is provided with a first friction disc and connected to a first electromagnetic module.

[0012] As a preferred embodiment of the semi-rigid base asphalt pavement crack detection device of the present invention, the first electromagnetic module includes a fixed cylinder, an electric disk, a limiting disk, a rotating shaft, a rotating gear, a moving shaft, a magnetic disk, a compression spring, and a second friction disk.

[0013] The fixed cylinder is fixedly installed on the outer wall of the inner shell and is coaxial with the rotating shaft. An electric disk and a limiting disk are respectively arranged inside the fixed cylinder, and the electric disk is close to the first friction disk. A rotating shaft is rotatably installed at the end of the fixed cylinder away from the inner shell. A rotating gear is fixedly installed on the end of the rotating shaft located outside the fixed cylinder. A movable shaft is slidably installed on the end of the rotating shaft located inside the fixed cylinder. A magnetic disk and a second friction disk are fixedly installed on the movable shaft, and the magnetic disk is located between the electric disk and the limiting disk. The second friction disk is located between the electric disk and the first friction disk, and the first and second friction disks cooperate with each other. The compression spring is fixedly installed between the magnetic disk and the electric disk.

[0014] In a preferred embodiment of the semi-rigid base asphalt pavement crack detection device of the present invention, the inner wall of the fixed cylinder is provided with a through rectangular groove, a sliding ring is slidably arranged on the outer wall of the fixed cylinder, a limiting groove is arranged in a ring around the axis of the rotating shaft, a rectangular plate is arranged in a ring around the axis of the moving shaft, and the rectangular plate is slidably located inside the limiting groove, the magnet disk and the compression spring are connected by a rotating ring, and the rotating ring is rotatably connected to the magnet disk, an extension rod is provided on the outer circumference of the rotating ring, and the extension rod passes through the rectangular groove and is fixedly connected to the sliding ring.

[0015] As a preferred embodiment of the semi-rigid base asphalt pavement crack detection device of the present invention, the second electromagnetic module includes a fixed rod, a movable ring and an electromagnet.

[0016] Multiple fixing rods are respectively fixedly installed on the outer wall of the inner shell, and the multiple fixing rods are coaxial with the multiple rotating shafts. Each of the multiple fixing rods has a sliding ring slidably installed on it, and an electromagnet is fixedly installed on the free end of each of the multiple fixing rods.

[0017] As a preferred embodiment of the semi-rigid base asphalt pavement crack detection device of the present invention, the transmission module includes a fixed block, a first slide rod, a second slide rod, a connecting rod, a connecting pin, and a movable rod.

[0018] Multiple fixing blocks are respectively fixedly installed on the inner walls of both sides of the inner shell, and two blocks are respectively located on both sides of the first electromagnetic module and the second electromagnetic module. The multiple fixing blocks are L-shaped, and each L-shaped fixing block has a groove. The first slide rod and the second slide rod are slidably installed at both ends of the L-shaped fixing blocks, and one end of the first slide rod and the second slide rod is located in the groove. The second slide rod is located above the moving plate. The two ends of the connecting rod are hinged to one end of the first slide rod and the second slide rod respectively through connecting pins. The other end of the first slide rod is hinged to one end of the movable rod, and the other ends of the multiple movable rods are respectively hinged to the adjacent sliding ring and the moving ring.

[0019] As a preferred embodiment of the semi-rigid base asphalt pavement crack detection device of the present invention, the driving component includes a drive motor, a first rotating wheel, a connecting bracket, a rotating screw, a second rotating wheel, a first belt, a rotating lead screw, a third rotating wheel, and a second belt.

[0020] The drive motor is fixedly mounted on the top of the inner shell. A first rotating wheel is fixedly mounted on the output end of the drive motor. Two connecting brackets are respectively fixedly mounted on the outer wall of the inner shell, and the two connecting brackets are located on one side of the first electromagnetic module. Rotating screws are rotatably mounted on the two connecting brackets. The rotating screws mesh with multiple rotating gears. A second rotating wheel is mounted on one end of the rotating screw, and the second rotating wheel is connected to the first rotating wheel through a first belt. A rotating lead screw is rotatably mounted on the outer wall of the inner shell and is located on the same vertical plane as the drive motor. A third rotating wheel is mounted on the rotating lead screw, and the third rotating wheel is connected to the first rotating wheel through a second belt.

[0021] As a preferred embodiment of the semi-rigid base asphalt pavement crack detection device of the present invention, the cleaning assembly includes a drive shaft, a drive gear, a rotating cylinder, a brush rod, and a rectangular shell.

[0022] The two ends of the drive shaft are rotatably mounted on the inner wall of the housing. A drive gear is fixedly mounted in the middle of the drive shaft and meshes with the rotating lead screw. Rotating cylinders are fixedly mounted on both ends of the drive shaft. Multiple brush rods are arranged in a circular array around the axis of the two rotating cylinders. The rectangular shell is fixedly mounted on the outer wall of the inner shell, and the drive gear is located inside the rectangular shell.

[0023] In a preferred embodiment of the semi-rigid base asphalt pavement crack detection device of the present invention, the second rotating wheel is connected to the rotating screw via a first ratchet, the third rotating wheel is connected to the rotating lead screw via a second ratchet, and the first ratchet and the second ratchet rotate in opposite directions.

[0024] In a preferred embodiment of the semi-rigid base asphalt pavement crack detection device of the present invention, the handle is provided with an adjustment button and a cleaning button, the adjustment button and the cleaning button are electrically connected to the control unit, and the drive motor, detection sensor, electromagnet and electromagnet are electrically connected to the control unit.

[0025] The beneficial effects of this invention are:

[0026] 1. This invention incorporates a detection component, a drive component, and a cleaning component within the housing. Through the cooperation of these components, the drive component rotates and adjusts the detection component. Different types of detection sensors are used to comprehensively detect the road surface. Simultaneously, the cleaning component cleans up road debris, further enhancing the detection accuracy of the detection component in detecting surface and internal road cracks. The handrail allows the entire device to be moved for detection, reducing detection costs, adapting to different detection environments, and improving the convenience of the detection device.

[0027] 2. This invention incorporates a detection drum within the detection assembly. The drum is rotated and adjusted by a first electromagnetic module and a second electromagnetic module working together to drive the assembly. This allows different types of detection sensors to simultaneously detect road surfaces, comprehensively detecting both surface and internal cracks. Furthermore, it enables sensors of the same type to detect road surfaces simultaneously, significantly improving the precision of the detection equipment and the accuracy of the detection results.

[0028] 3. This invention improves the accuracy of subsequent detection results by incorporating a rotating cylinder and a brush rod on the sweeping assembly and driving the rotating cylinder and brush rod to rotate via a drive assembly.

[0029] 4. Through the cooperation of the first electromagnetic module and the second electromagnetic module, the present invention enables the driving component to drive the rotation of a single detection drum. According to the actual detection environment and actual detection needs, the rotation of the detection sensor on the single detection drum can be adjusted, which greatly improves the applicability of the entire detection equipment and the accuracy of detection. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall three-dimensional structure in an embodiment of this disclosure.

[0031] Figure 2 This is a three-dimensional structural diagram of the interior of the housing in an embodiment of this disclosure.

[0032] Figure 3This is a three-dimensional structural diagram of the interior of the housing from another perspective in an embodiment of this disclosure.

[0033] Figure 4 This is a three-dimensional structural diagram of the detection component, cleaning component, and driving component in the embodiments of this disclosure.

[0034] Figure 5 This is a three-dimensional structural diagram of the cleaning component and the driving component in the embodiments of this disclosure.

[0035] Figure 6 This is a three-dimensional structural diagram of the interior of the inner shell in an embodiment of this disclosure.

[0036] Figure 7 This is a three-dimensional structural diagram of the interior of the inner shell from another perspective in an embodiment of this disclosure.

[0037] Figure 8 This is a three-dimensional structural diagram of the bottom of the inner shell in an embodiment of this disclosure.

[0038] Figure 9 This is a partial cross-sectional view of the first electromagnetic module on the detection component in an embodiment of this disclosure.

[0039] Figure 10 As described in this embodiment of the disclosure Figure 9 Enlarged view of point A in the middle.

[0040] Figure 11 This is a three-dimensional structural diagram of the internal structure of the first electromagnetic module in an embodiment of this disclosure.

[0041] Figure 12 This is a three-dimensional structural diagram of the transmission module in an embodiment of this disclosure.

[0042] Figure 13 This is a three-dimensional structural diagram of the detection drum in an embodiment of this disclosure.

[0043] Reference numerals: 1. Housing; 2. Wheel; 3. Control unit; 4. Handrail; 5. Cleaning assembly; 51. Drive shaft; 52. Drive gear; 53. Rotating cylinder; 54. Brush rod; 55. Rectangular shell; 6. Detection assembly; 61. Inner shell; 62. Moving plate; 63. Detection cylinder; 631. Detection sensor; 632. Bottom surface; 633. Rotating shaft; 634. First friction disc; 64. First electromagnetic module; 641. Fixed cylinder; 6411. Rectangular groove; 6412. Sliding ring; 642. Electromagnetic disk; 643. Limiting disc; 644. Rotating shaft; 6441. Limiting groove; 645. Rotating gear; 646. Moving shaft; 6461. Rectangular plate; 64 7. Magnetic disk; 6471. Rotating ring; 6472. Extension rod; 648. Compression spring; 649. Second friction disk; 65. Second electromagnetic module; 651. Fixed rod; 652. Moving ring; 653. Electromagnet; 66. Transmission module; 661. Fixed block; 662. Groove; 663. First slide rod; 664. Second slide rod; 665. Connecting rod; 666. Connecting pin; 667. Movable rod; 67. Tension spring; 7. Drive assembly; 71. Drive motor; 72. First rotating wheel; 73. Connecting bracket; 74. Rotating screw; 75. Second rotating wheel; 76. First belt; 77. Rotating lead screw; 78. Third rotating wheel; 79. Second belt. Detailed Implementation

[0044] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] like Figures 1 to 13 As shown, a semi-rigid base asphalt pavement crack detection device includes: a housing 1, a wheel 2, a control unit 3, a handle 4, a cleaning component 5, a detection component 6, and a drive component 7;

[0046] Multiple wheels 2 are rotatably mounted on both sides of the housing 1. A control unit 3 is fixedly mounted on the top of the housing 1. A handrail 4 is fixedly mounted on the top of the rear end of the housing 1. A cleaning component 5 is fixedly mounted on the bottom of the front end of the housing 1. A detection component 6 is fixedly mounted inside the housing 1. A drive component 7 is fixedly mounted inside the housing 1, and the drive component 7 is connected to the cleaning component 5 and the drive component 7 respectively.

[0047] The detection component 6 includes an inner shell 61, a movable plate 62, a detection rotating drum 63, a first electromagnetic module 64, a second electromagnetic module 65, a transmission module 66, and a tension spring 67.

[0048] The inner shell 61 is fixedly installed inside the shell 1. Multiple movable plates 62 are movably installed at the bottom of the inner shell 61. Multiple detection cylinders 63 are rotatably installed inside the inner shell 61. The multiple detection cylinders 63 are arranged at intervals with the multiple movable plates 62. Multiple first electromagnetic modules 64 are fixedly installed on one side of the inner shell 61, and the multiple first electromagnetic modules 64 are connected to the multiple detection cylinders 63. Multiple second electromagnetic modules 65 are fixedly installed on the other side of the inner shell 61. Transmission modules 66 are fixedly installed between multiple adjacent first electromagnetic modules 64 and multiple adjacent second electromagnetic modules 65. Multiple tension springs 67 are fixedly installed on the top of the multiple movable plates 62, and the free ends of the multiple tension springs 67 are fixedly connected to the inner wall of the top of the inner shell 61.

[0049] The first electromagnetic module 64 and the second electromagnetic module 65 drive the transmission module 66 to push the moving plate 62 downward. At the same time, the drive component 7 drives the first electromagnetic module 64 to rotate and adjust the detection drum 63. Subsequently, the drive component 7 drives the sweeping component 5 to sweep and detect the road surface.

[0050] The housing 1, serving as the mounting carrier for the entire device, is made of high-strength, wear-resistant material. This effectively protects the internal components from dust, impacts, and harsh environments encountered during road operations, ensuring long-term stable operation. The handrail 4 features an ergonomic design with anti-slip textures, providing easy grip and support for the operator. It facilitates easy movement of the entire device and provides stability during operation, allowing for observation of the road surface and operation of the control unit 3. The cleaning component 5, located in front of the detection component 6, pre-treats the road surface before detection, removing debris such as gravel, leaves, and dust. This prevents debris from obscuring cracks or damaging the detection component 6, clearing obstacles for subsequent detection work and improving the accuracy of the results.

[0051] The detection component 6 is the core component for detecting road surface cracks, and is responsible for identifying road surface cracks and collecting data. The drive component 7 provides sufficient power for the cleaning component 5 and the detection component 6.

[0052] The movable plate 62 is made of lightweight, high-strength sheet metal, with its bottom maintaining a reasonable distance from the road surface. Multiple detection rotating cylinders 63 are evenly spaced from the movable plate 62, meaning one detection rotating cylinder 63 is positioned between every two adjacent movable plates 62. Multiple first electromagnetic modules 64 are connected one-to-one with the multiple detection rotating cylinders 63, primarily responsible for receiving commands from the control unit 3 and driving the detection rotating cylinders 63 to rotate and adjust, enabling the switching of different detection sensors 631 to meet the needs of different dimensions of road crack detection. Second electromagnetic modules 65 are symmetrically arranged with the first electromagnetic modules 64, forming a cooperative driving structure.

[0053] The transmission module 66 adopts a rigid transmission structure, which can accurately transmit the driving force of the first electromagnetic module 64 and the second electromagnetic module 65 to the moving plate 62, ensuring that the moving plate 62 moves downward and provides sufficient rotation space for the rotation of the detection drum 63, preventing collision interference between the detection sensor 631 and the moving plate 62 when the detection drum 63 rotates. When the moving plate 62 is pushed downward by the transmission module 66, the tension spring 67 is stretched and stores energy. After the driving force disappears, the tension spring 67 can pull the moving plate 62 back to its original position by relying on its own elastic potential energy.

[0054] like Figure 10 and Figure 13 As shown, the detection rotating cylinder 63 has a polyhedral structure. Multiple detection sensors 631 are respectively installed on multiple faces of the detection rotating cylinder 63, and the detection sensors 631 on different faces are of different types. Any face of the detection rotating cylinder 63 is the bottom face 632. A rotating shaft 633 is fixedly installed inside the detection rotating cylinder 63. One end of the rotating shaft 633 is rotatably connected to the inner wall of the inner shell 61, and the other end penetrates the inner wall of the inner shell 61 and is provided with a first friction disc 634, and is connected to the first electromagnetic module 64.

[0055] The detection drum 63 has a polyhedral structure, preferably a regular pentahedron, ensuring that at least one face always faces the road surface precisely after rotation and adjustment, meeting the detection requirements. Multiple identical detection sensors 631 are bolted to each mounting surface, and the sensors 631 on different mounting surfaces are of different types. Specifically, depending on the road crack detection requirements, they can be equipped with lidar sensors, ground-penetrating radar sensors, ultrasonic sensors, and infrared thermal imaging sensors. These sensors have clearly defined functions and complement each other, enabling multi-dimensional detection operations such as surface identification and depth detection of road cracks. Any one face of the detection drum 63 is designated as the bottom face 632. Initially, this bottom face 632 faces vertically downwards. At this time, the other faces of the detection drum 63 with sensors are housed inside the inner shell 61, effectively preventing the sensors from being impacted by external debris or contaminated by dust, thus providing protection. The first friction disc 634 on the other end of the rotating shaft 633 is connected to the first electromagnetic module 64. Through the driving action of the first electromagnetic module 64, the rotating shaft 633 and the detection drum 63 can be driven to achieve precise rotation adjustment, thereby switching the detection sensors 631 on different surfaces to face the road surface.

[0056] like Figure 10 and Figure 11 As shown, the first electromagnetic module 64 includes a fixed cylinder 641, an electric disk 642, a limiting disk 643, a rotating shaft 644, a rotating gear 645, a moving shaft 646, a magnetic disk 647, a compression spring 648, and a second friction disk 649.

[0057] The fixed cylinder 641 is fixedly installed on the outer wall of the inner shell 61 and is coaxial with the rotating shaft 633. An electric disk 642 and a limiting disk 643 are respectively arranged inside the fixed cylinder 641, and the electric disk 642 is close to the first friction disk 634. A rotating shaft 644 is rotatably installed at the end of the fixed cylinder 641 away from the inner shell 61. A rotating gear 645 is fixedly installed on the end of the rotating shaft 644 located outside the fixed cylinder 641. A moving shaft 646 is slidably installed on the end of the rotating shaft 644 located inside the fixed cylinder 641. A magnetic disk 647 and a second friction disk 649 are fixedly installed on the moving shaft 646, and the magnetic disk 647 is located between the electric disk 642 and the limiting disk 643. The second friction disk 649 is located between the electric disk 642 and the first friction disk 634, and the first friction disk 634 and the second friction disk 649 cooperate with each other. The compression spring 648 is fixedly installed between the magnetic disk 647 and the electric disk 642.

[0058] Multiple first electromagnetic modules 64 are connected one-to-one with multiple detection rotating cylinders 63. Their main function is to receive commands from the control unit 3, drive the detection rotating cylinders 63 to rotate and adjust, realize the transmission and disconnection of power, and thus control whether the detection rotating cylinders 63 rotate. The fixed cylinder 641, serving as the mounting base for the first electromagnetic modules 64, is integrally formed from high-strength metal. Its axis is coaxial with the rotation axis 633 of the detection rotating cylinder 63, ensuring accurate and error-free subsequent power transmission. The fixed cylinder 641 is securely fixed to the outer wall of the inner shell 61 with bolts.

[0059] The rotating shaft 644 and the fixed cylinder 641 are coaxially arranged. The bearing arrangement ensures the smooth rotation of the rotating shaft 644 and effectively seals the internal cavity of the fixed cylinder 641, preventing dust and moisture from entering and affecting the operation of internal components. The rotating gear 645 meshes with the transmission structure of the drive assembly 7 and is used to receive the power transmitted by the drive assembly 7. The moving shaft 646 is slidably mounted on the rotating shaft 644 through a sliding groove. The two are clearance-fitted to ensure that the moving shaft 646 can slide flexibly along the axis of the rotating shaft 644. At the same time, when the rotating shaft 644 rotates, it can drive the moving shaft 646 to rotate synchronously through the sliding groove, realizing the synchronous transmission of power.

[0060] The second friction disk 649 is located between the electric disk 642 and the first friction disk 634. Its diameter is consistent with that of the first friction disk 634, and the opposing surfaces of the two friction disks are provided with wear-resistant friction textures to ensure that sufficient friction can be generated when the two are in contact, so as to realize the effective transmission of power. That is, the first friction disk 634 and the second friction disk 649 cooperate with each other to form a friction pair for power transmission. When the compression spring 648 is in its natural state, it uses its own elastic potential energy to push the magnet disk 647 towards the limiting disk 643, thereby driving the moving shaft 646 and the second friction disk 649 to move synchronously, keeping the second friction disk 649 separated from the first friction disk 634. At this time, the rotation of the rotating shaft 644 cannot be transmitted to the rotating shaft 633. When the electric disk 642 is energized and generates a magnetic field, it will attract the magnet disk 647 to move towards the electric disk 642. The compression spring 648 is compressed and stores energy, while driving the second friction disk 649 to move towards the first friction disk 634 and fit tightly together. At this time, the rotation of the rotating shaft 644 can be transmitted to the rotating shaft 633 through the moving shaft 646 and the friction pair, thereby driving the detection drum 63 to rotate.

[0061] like Figure 10 and Figure 11 As shown, a through rectangular groove 6411 is provided on the inner wall of the fixed cylinder 641, and a sliding ring 6412 is slidably arranged on the outer wall of the fixed cylinder 641. Limiting grooves 6441 are arranged in a ring around the axis of the rotating shaft 644, and rectangular plates 6461 are arranged in a ring around the axis of the moving shaft 646. The rectangular plates 6461 are slidably located inside the limiting grooves 6441. The magnet disk 647 and the compression spring 648 are connected by a rotating ring 6471, and the rotating ring 6471 is rotatably connected to the magnet disk 647. An extension rod 6472 is provided on the outer circumference of the rotating ring 6471, and the extension rod 6472 passes through the rectangular groove 6411 and is fixedly connected to the sliding ring 6412.

[0062] To achieve smooth sliding of the moving shaft 646 and synchronous linkage with the rotating ring 6471, a rectangular slide groove 6411 extends along the axial direction of the fixed cylinder 641. Its length matches the maximum sliding stroke of the moving shaft 646, and its width is adapted to the size of the extension rod 6472, ensuring that the extension rod 6472 can slide smoothly within the slide groove without wobbling. Simultaneously, the rectangular slide groove 6411 penetrates the inner wall of the fixed cylinder 641, providing a through-path for the extension rod 6472. The inner wall of the sliding ring 6412 is clearance-fitted with the outer wall of the fixed cylinder 641, allowing it to slide flexibly along the axial direction of the fixed cylinder 641, with its sliding action synchronized with the movement of the moving shaft 646.

[0063] The limiting groove 6441 extends along the axial direction of the rotating shaft 644. The groove has a rectangular cross-section, and multiple limiting grooves 6441 are evenly distributed to ensure uniform force distribution. Correspondingly, multiple rectangular plates 6461 on the moving shaft 646 are perfectly matched in number and size with the limiting grooves 6441. Each rectangular plate 6461 is slidably embedded in the corresponding limiting groove 6441, realizing a sliding connection between the moving shaft 646 and the rotating shaft 644. This allows the moving shaft 646 to move flexibly along the axial direction of the rotating shaft 644, and the cooperation between the rectangular plates 6461 and the limiting grooves 6441 ensures that the rotating shaft 644 can accurately drive the moving shaft 646 to rotate synchronously.

[0064] One side of the rotating ring 6471 is rotatably connected to the magnet disk 647 via a thrust bearing. The thrust bearing allows the magnet disk 647 to rotate freely relative to the rotating ring 6471, preventing the magnet disk 647 from driving the rotating ring 6471 to rotate synchronously and interfering with the compression spring 648. This ensures that the compression spring 648 can stably apply an elastic force to the rotating ring 6471 and the magnet disk 647.

[0065] like Figure 5 and Figure 7 As shown, the second electromagnetic module 65 includes a fixed rod 651, a movable ring 652, and an electromagnet 653;

[0066] Multiple fixing rods 651 are respectively fixedly installed on the outer wall of the inner shell 61, and the multiple fixing rods 651 are coaxial with the multiple rotating shafts 633. A movable ring 652 is slidably installed on each of the multiple fixing rods 651, and an electromagnet 653 is fixedly installed on the free end of each of the multiple fixing rods 651.

[0067] The second electromagnetic module 65 and the first electromagnetic module 64 are arranged symmetrically to form a cooperative driving structure. The two work synchronously and cooperate with each other to provide driving force for the transmission module 66, ensuring that both ends of the moving plate 62 can move downward synchronously. Furthermore, the second electromagnetic module 65 cooperates with the fixed rod 651, the moving ring 652 and the electromagnet 653 to achieve stable driving of the transmission module 66.

[0068] like Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 12 As shown, the transmission module 66 includes a fixed block 661, a first slide rod 663, a second slide rod 664, a connecting rod 665, a connecting pin 666, and a movable rod 667;

[0069] Multiple fixing blocks 661 are fixedly installed on the inner walls of both sides of the inner shell 61, and two blocks are respectively located on both sides of the first electromagnetic module 64 and the second electromagnetic module 65. The multiple fixing blocks 661 are L-shaped, and each L-shaped fixing block 661 has a groove 662. The first slide rod 663 and the second slide rod 664 are slidably installed at both ends of the L-shaped fixing block 661, and one end of the first slide rod 663 and the second slide rod 664 is located in the groove 662. The second slide rod 664 is located above the moving plate 62. The two ends of the connecting rod 665 are hinged to one end of the first slide rod 663 and the second slide rod 664 respectively through connecting pins 666. The other end of the first slide rod 663 is hinged to one end of the movable rod 667, and the other ends of the multiple movable rods 667 are respectively hinged to the adjacent sliding ring 6412 and the moving ring 652.

[0070] The transmission module 66, serving as the power transmission carrier between the first electromagnetic module 64 and the second electromagnetic module 65, employs a rigid transmission structure. This structure precisely and synchronously transmits the driving force of both modules to the moving plate 62, ensuring that multiple moving plates 62 move downwards in sync. The transmission modules 66 are arranged symmetrically on either side of the first electromagnetic module 64 and the second electromagnetic module 65, ensuring balanced force distribution and preventing skewness during transmission. The fixed block 661 adopts an L-shaped integrated structure, made of high-strength metal, resulting in a robust structure with high load-bearing capacity. It stably supports the sliding and hinged movements of components such as the first slide rod 663 and the second slide rod 664. When the second slide rod 664 slides downwards, it directly contacts the moving plate 62 and applies a downward thrust, propelling the moving plate 62 downwards synchronously.

[0071] like Figures 3 to 8 As shown, the drive assembly 7 includes a drive motor 71, a first rotating wheel 72, a connecting bracket 73, a rotating screw 74, a second rotating wheel 75, a first belt 76, a rotating lead screw 77, a third rotating wheel 78, and a second belt 79.

[0072] The drive motor 71 is fixedly installed on the top of the inner shell 61. A first rotating wheel 72 is fixedly installed on the output end of the drive motor 71. Two connecting brackets 73 are respectively fixedly installed on the outer wall of the inner shell 61, and the two connecting brackets 73 are located on one side of the first electromagnetic module 64. A rotating screw 74 is rotatably installed on the two connecting brackets 73. The rotating screw 74 meshes with a plurality of rotating gears 645. A second rotating wheel 75 is installed on one end of the rotating screw 74, and the second rotating wheel 75 is connected to the first rotating wheel 72 through a first belt 76. A rotating lead screw 77 is rotatably installed on the outer wall of the inner shell 61 and is located on the same vertical plane as the drive motor 71. A third rotating wheel 78 is installed on the rotating lead screw 77, and the third rotating wheel 78 is connected to the first rotating wheel 72 through a second belt 79.

[0073] The drive assembly 7, as the power core of the entire device, provides stable power for the rotation adjustment of the detection drum 63 and the cleaning operation of the sweeping assembly 5. The drive motor 71 is electrically connected to the control unit 3 and can receive forward / reverse rotation, start / stop commands from the control unit 3 to achieve precise control. The drive motor 71 is firmly fixed to the top of the inner shell 61 with bolts. The first pulley 72 adopts a synchronous belt pulley structure with anti-slip teeth on its surface, which can enhance the friction with the belt, avoid slippage during transmission, and ensure the stability of power transmission. As the starting component of power output, the first pulley 72 is connected to the second pulley 75 and the third pulley 78 through two belts respectively to realize the split transmission of power, providing driving force for the detection drum 63 and the sweeping assembly 5 respectively.

[0074] The connecting bracket 73 provides stable support for the rotating screw 74, preventing the rotating screw 74 from shaking or deviating when rotating. At the same time, it ensures that the rotating screw 74 and the rotating gear 645 of the first electromagnetic module 64 are precisely meshed, so as to realize the synchronous adjustment of the multi-detection drum 63.

[0075] like Figures 3 to 5 As shown, the cleaning assembly 5 includes a drive shaft 51, a drive gear 52, a rotating cylinder 53, a brush rod 54, and a rectangular shell 55;

[0076] The transmission shaft 51 is rotatably mounted on the inner wall of the housing 1 at both ends. A transmission gear 52 is fixedly mounted in the middle of the transmission shaft 51 and meshes with the rotating lead screw 77. Rotating cylinders 53 are fixedly mounted on both ends of the transmission shaft 51. Multiple brush rods 54 are arranged in a circular array around the axis on the two rotating cylinders 53. The rectangular shell 55 is fixedly mounted on the outer wall of the inner shell 61 and the transmission gear 52 is located inside the rectangular shell 55.

[0077] The sweeping component 5, as the core pre-treatment component before road surface inspection, is mainly used to remove debris such as gravel, fallen leaves, dust, and laitance from the road surface, preventing debris from obscuring road surface cracks and damaging the detection sensor 631, thus ensuring the accuracy of the detection results. The drive shaft 51 is made of high-strength alloy round shaft, which has a sturdy structure and strong bending resistance, and can withstand the impact and torque during sweeping operations, ensuring long-term stable operation.

[0078] The transmission gear 52 meshes with the rotating lead screw 77 of the drive assembly 7, ensuring that the rotating lead screw 77 can smoothly drive the transmission gear 52 to rotate synchronously, thereby driving the transmission shaft 51 to rotate. In order to effectively protect the transmission gear 52 from dust contamination and collision with debris, which would affect its meshing accuracy and service life, a rectangular shell 55 is located on the outside of the transmission gear 52, which does not affect the normal rotation of the transmission gear 52 and provides comprehensive protection.

[0079] The distance between the two rotating cylinders 53 and the road surface is designed to ensure that the brush rods 54 can effectively contact the road surface for cleaning, while avoiding damage caused by excessive friction between the brush rods 54 and the road surface. The brush rods 54 are made of wear-resistant nylon, which is tough and elastic, effectively cleaning debris from the road surface without scratching the asphalt surface. Multiple brush rods 54 are evenly distributed to ensure that there are no omissions or blind spots during cleaning, thus improving cleaning efficiency.

[0080] The second rotating wheel 75 is connected to the rotating screw 74 via the first ratchet, and the third rotating wheel 78 is connected to the rotating lead screw 77 via the second ratchet, with the first ratchet and the second ratchet rotating in opposite directions.

[0081] To achieve precise power distribution and switching of the drive motor 71 and ensure that the rotation adjustment of the detection drum 63 and the operation of the sweeping component 5 do not interfere with each other, the first ratchet and the second ratchet can achieve unidirectional power transmission, that is, torque is transmitted only in a specific rotation direction, and when rotating in the opposite direction, they are in an idle state and do not transmit power, thereby realizing independent operation control of the detection component 6 and the sweeping component 5.

[0082] When the drive motor 71 rotates in the forward direction, the first rotating wheel 72 drives the second rotating wheel 75 to rotate synchronously in the forward direction via the first belt 76. At this time, the first ratchet is in the locked state, which can accurately transmit the rotational torque of the second rotating wheel 75 to the rotating screw 74, causing the rotating screw 74 to rotate, thereby driving the detection drum 63 to rotate and adjust. When the drive motor 71 rotates in the reverse direction, the second rotating wheel 75 rotates in the reverse direction with the first rotating wheel 72. At this time, the first ratchet is in the unlocked state, and the reverse rotation of the second rotating wheel 75 cannot be transmitted to the rotating screw 74. The rotating screw 74 remains stationary, avoiding malfunction of the detection drum 63.

[0083] Correspondingly, the unidirectional rotation direction of the second ratchet is opposite to that of the first ratchet. When the drive motor 71 rotates in the reverse direction, the first wheel 72 drives the third wheel 78 to rotate synchronously in the reverse direction through the second belt 79. At this time, the second ratchet is in a locked state, which can transmit the rotational torque of the third wheel 78 to the rotating screw 77, causing the rotating screw 77 to rotate, thereby driving the cleaning assembly 5 to start operation. When the drive motor 71 rotates in the forward direction, the third wheel 78 rotates in the forward direction with the first wheel 72. At this time, the second ratchet is in an unlocked state, and the forward rotation of the third wheel 78 cannot be transmitted to the rotating screw 77. The rotating screw 77 remains stationary, ensuring that the cleaning assembly 5 does not start when the rotating drum 63 is being adjusted, thus avoiding interference between the two.

[0084] The handrail 4 is equipped with an adjustment button and a cleaning button, which are electrically connected to the control unit 3. The drive motor 71, the detection sensor 631, the electromagnet 642, and the electromagnet 653 are electrically connected to the control unit 3.

[0085] To facilitate quick control of the device during operation, the handle 4 is equipped with adjustment and cleaning buttons. These buttons are easily accessible to the operator while holding the handle 4, ensuring convenient operation and preventing accidental activation. The adjustment button controls the rotation of the detection drum 63, while the cleaning button controls the start and stop of the cleaning assembly 5. The drive motor 71, detection sensor 631, electromagnet 642, and electromagnet 653 are electrically connected to the control unit 3, forming a complete electrical control circuit. The power supply, start / stop, and operation adjustment of each component are all controlled by unified commands from the control unit 3. All electrical connections are sealed to prevent poor contact caused by road dust and moisture, ensuring the stability and reliability of the electrical control circuit and guaranteeing long-term stable operation of the device.

[0086] The working principle of the present invention is as follows: It should be noted that multiple detection sensors 631, including lidar, ground penetrating radar, ultrasonic, and infrared thermal imaging, are installed on multiple surfaces of the detection drum 63. Multiple detection sensors 631 of the same type are installed on each surface. In the initial state, the bottom surface 632 of the detection drum 63 is vertically downward, and the other surfaces are located inside the inner shell 61.

[0087] During testing, the operator first controls the rotation of multiple detection drums 63 using the adjustment buttons on the handle 4, rotating the required detection sensor 631 downwards. The control unit 3 then powers on all the electromagnets 642, generating a magnetic field that attracts the magnetic disk 647. This attracts the magnetic disk 647, causing it to move horizontally within the fixed cylinder 641. The magnetic disk 647 then moves the rotating ring 6471, compressing the compression spring 648. Simultaneously, the magnetic disk 647 moves the moving shaft 646 along with it. When the moving shaft 646 moves, the rectangular plate 6461 on the moving shaft 646 slides in the limiting groove 6441 inside the rotating shaft 644. The moving shaft 646 drives the second friction disk 649 to move, and the second friction disk 649 will come into contact with the first friction disk 634. When the magnet disk 647 drives the rotating ring 6471 to move, the extension rod 6472 on the rotating ring 6471 will slide in the rectangular sliding groove 6411 on the fixed cylinder 641, and simultaneously drive the sliding ring 6412 to move axially on the outer wall of the fixed cylinder 641.

[0088] Simultaneously, the control unit 3 also controls the electromagnet 653 to be energized, generating a magnetic field and pushing the moving ring 652 to move. Since two movable rods 667 are hinged on the same moving ring 652 and sliding ring 6412, when the sliding ring 6412 on the first electromagnetic module 64 and the moving ring 652 on the second electromagnetic module 65 on both sides of the detection drum 63 move synchronously, they will simultaneously push the movable rods 667 on both sides to move. The movable rods 667 drive the first sliding rod 663 to slide inward in the groove 662 of the fixed block 661 and transmit the power to the connecting rod 665. The connecting rod 665 pushes the second sliding rod 664 to slide outward in the groove 662 of the fixed block 661.

[0089] At this time, the tops of both sides of all the movable plates 62 at the bottom of the inner shell 61 will contact the second slide rod 664, and the downward movement of the second slide rod 664 will push all the movable plates 62 to move downward a certain distance, providing rotation space for the rotation adjustment of the detection drum 63, preventing interference between the detection drum 63 and the movable plates 62. During the downward movement of the movable plates 62, the tension springs 67 above all the movable plates 62 will be stretched and stored.

[0090] Meanwhile, control unit 3 controls drive motor 71 to drive, and drive motor 71 transmits power to second wheel 75 through first wheel 72 and first belt 76. Second wheel 75 drives rotating screw 74 to rotate through first ratchet. Since rotating screw 74 meshes with all rotating gears 645, it transmits power to rotating gears 645, which in turn drive rotating shaft 644 and moving shaft 646 to rotate. First friction disk 634 contacts second friction disk 649, and the rotational power is transmitted to first friction disk 634 and second friction disk 649 through moving shaft 646. Finally, rotating shaft 633 drives detection drum 63 to rotate, moving the detection drum 63... The detection sensor 631 used above rotates to the bottom. After the rotation is completed, the drive motor 71 stops rotating. At the same time, the electric disk 642 and electromagnet 653 are de-energized, and the magnetic field generated by the electric disk 642 and electromagnet 653 disappears. Inside the fixed cylinder 641, the compression spring 648 will push the magnet block and the moving shaft 646 to reset through its own elastic potential energy. The tension spring 67 on the moving rod will also pull the moving plate 62 to move in the opposite direction and reset through its own elastic potential energy. At the same time, the moving plate 62 pushes the second slide rod 664 to reset. The second slide rod 664 drives the connecting rod 665 and the first slide rod 663 to reset, and pushes the movable rod 667 to drive the sliding ring 6412 and the moving rod to reset.

[0091] It should be noted that when the drive motor 71 drives the rotating screw 74 to rotate, the drive motor 71 will also drive the third rotating wheel 78 to rotate through the second belt 79. However, since the third rotating wheel 78 is connected to the rotating screw 77 through the second ratchet, the third rotating wheel 78 will not drive the rotating screw 77 to rotate.

[0092] Subsequently, the operator starts the drive motor 71 by pressing the cleaning button, causing the drive motor 71 to rotate in the opposite direction. Similarly, when the drive motor 71 rotates in the opposite direction, it will drive the second wheel 75 to rotate through the first belt 76. Since the second wheel 75 is connected to the rotating screw 74 through the first ratchet, the second wheel 75 will not drive the rotating screw 74 to rotate.

[0093] The drive motor 71 drives the third rotating wheel 78 to rotate via the second belt 79. The third rotating wheel 78 drives the rotating screw 77 to rotate via the second ratchet. Since the rotating screw 77 meshes with the transmission gear 52, the power is transmitted to the transmission gear 52, which in turn drives the transmission shaft 51 to rotate. This causes the rotating cylinder 53 to drive the brush rod 54 to rotate and scrub the gravel on the road surface. The operator holds the handle 4 and pushes the entire detection device forward. The sweeping component 5 first sweeps the road surface, and then the different detection sensors 631 on the detection component 6 detect the road surface, which greatly improves the accuracy of the detection results.

[0094] It should be noted that each detection drum 63 can be controlled individually. By controlling the corresponding electric disk 642 and electromagnet 653 to be energized, the power of the drive motor 71 can be transmitted to the detection drum 63, causing the detection drum 63 to rotate. Therefore, the present invention has two working modes. In the first mode, the detection sensors 631 facing the road surface on all detection drums 63 are different. From front to back, they are lidar, ground penetrating radar, ultrasonic, and infrared thermal imaging. The lidar detects cracks on the surface, while the ground penetrating radar, ultrasonic, and infrared thermal imaging detect the depth of the cracks. By using the detection characteristics of different types of detection sensors 631, the detection results of different types of detection sensors 631 can be compared and complemented, thereby improving the accuracy of the overall detection results.

[0095] The second method involves using the same type of detection sensor 631 on all the rotating drums 63 facing the road surface. Multiple detections are performed using the same type of detection sensor 631, and the average value of the detection results is taken to further improve the accuracy of the detection results.

[0096] Finally, when not in use, the bottom surface 632 on the detection drum 63 is rotated and oriented toward the road surface, so that the different detection sensors 631 on the detection drum 63 are located inside the inner shell 61, thereby protecting the different detection sensors 631.

[0097] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for detecting cracks in semi-rigid base asphalt pavement, characterized in that, include: Housing (1), wheels (2), control unit (3), handrail (4), cleaning assembly (5), detection assembly (6) and drive assembly (7); Multiple wheels (2) are rotatably mounted on both sides of the housing (1), a control unit (3) is fixedly mounted on the top of the housing (1), a handrail (4) is fixedly mounted on the top of the rear end of the housing (1), a cleaning component (5) is fixedly mounted on the bottom of the front end of the housing (1), a detection component (6) is fixedly mounted inside the housing (1), and a drive component (7) is fixedly mounted inside the housing (1), and the drive component (7) is connected to the cleaning component (5) and the drive component (7) respectively; The detection component (6) includes an inner shell (61), a movable plate (62), a detection drum (63), a first electromagnetic module (64), a second electromagnetic module (65), a transmission module (66), and a tension spring (67). The inner shell (61) is fixedly installed inside the shell (1). Multiple movable plates (62) are movably installed at the bottom of the inner shell (61). Multiple detection cylinders (63) are rotatably installed inside the inner shell (61). The multiple detection cylinders (63) are arranged at intervals with the multiple movable plates (62). Multiple first electromagnetic modules (64) are fixedly installed on one side of the inner shell (61), and the multiple first electromagnetic modules (64) are connected to the multiple detection cylinders (63). Multiple second electromagnetic modules (65) are fixedly installed on the other side of the inner shell (61). A transmission module (66) is fixedly installed between multiple adjacent first electromagnetic modules (64) and multiple adjacent second electromagnetic modules (65). Multiple tension springs (67) are fixedly installed on the top of the multiple movable plates (62), and the free ends of the multiple tension springs (67) are fixedly connected to the inner wall of the top of the inner shell (61). The first electromagnetic module (64) and the second electromagnetic module (65) drive the transmission module (66) to push the moving plate (62) downward. At the same time, the drive component (7) drives the first electromagnetic module (64) to rotate and adjust the detection drum (63). Then the drive component (7) drives the sweeping component (5) to sweep and detect the road surface.

2. The semi-rigid base asphalt pavement crack detection device as described in claim 1, characterized in that: The detection drum (63) has a polyhedral structure. Multiple detection sensors (631) are installed on multiple faces of the detection drum (63), and the detection sensors (631) on different faces are of different types. Any face of the detection drum (63) is the bottom face (632). A rotating shaft (633) is fixedly installed inside the detection drum (63). One end of the rotating shaft (633) is rotatably connected to the inner wall of the inner shell (61), and the other end penetrates the inner wall of the inner shell (61) and is provided with a first friction disc (634), and is connected to the first electromagnetic module (64).

3. The semi-rigid base asphalt pavement crack detection device as described in claim 2, characterized in that: The first electromagnetic module (64) includes a fixed cylinder (641), an electric disk (642), a limiting disk (643), a rotating shaft (644), a rotating gear (645), a moving shaft (646), a magnetic disk (647), a compression spring (648), and a second friction disk (649). The fixed cylinder (641) is fixedly installed on the outer wall of the inner shell (61) and is coaxial with the rotating shaft (633). An electric disk (642) and a limiting disk (643) are respectively provided inside the fixed cylinder (641), and the electric disk (642) is close to the first friction disk (634). A rotating shaft (644) is rotatably installed at the end of the fixed cylinder (641) away from the inner shell (61). A rotating gear (645) is fixedly installed on the end of the rotating shaft (644) located outside the fixed cylinder (641). A movable shaft (646) is slidably mounted on one end of the interior of the device. A magnetic disk (647) and a second friction disk (649) are fixedly mounted on the movable shaft (646). The magnetic disk (647) is located between the electromagnet (642) and the limiting disk (643). The second friction disk (649) is located between the electromagnet (642) and the first friction disk (634). The first friction disk (634) and the second friction disk (649) cooperate with each other. A compression spring (648) is fixedly mounted between the magnetic disk (647) and the electromagnet (642).

4. The semi-rigid base asphalt pavement crack detection device as described in claim 3, characterized in that: The inner wall of the fixed cylinder (641) is provided with a through rectangular groove (6411), and a sliding ring (6412) is slidably arranged on the outer wall of the fixed cylinder (641). The rotating shaft (644) is provided with a limiting groove (6441) arranged in a ring around the axis. The moving shaft (646) is provided with a rectangular plate (6461) arranged in a ring around the axis, and the rectangular plate (6461) is slidably located inside the limiting groove (6441). The magnet disk (647) and the compression spring (648) are connected by a rotating ring (6471), and the rotating ring (6471) is rotatably connected to the magnet disk (647). An extension rod (6472) is provided on the outer circumference of the rotating ring (6471), and the extension rod (6472) passes through the rectangular groove (6411) and is fixedly connected to the sliding ring (6412).

5. The semi-rigid base asphalt pavement crack detection device as described in claim 3, characterized in that: The second electromagnetic module (65) includes a fixed rod (651), a movable ring (652), and an electromagnet (653). Multiple fixed rods (651) are respectively fixedly installed on the outer wall of the inner shell (61), and the multiple fixed rods (651) are respectively coaxial with the multiple rotating shafts (633). A movable ring (652) is slidably installed on each of the multiple fixed rods (651), and an electromagnet (653) is respectively fixedly installed on the free end of each of the multiple fixed rods (651).

6. The semi-rigid base asphalt pavement crack detection device as described in claim 5, characterized in that: The transmission module (66) includes a fixed block (661), a first slide bar (663), a second slide bar (664), a connecting rod (665), a connecting pin (666), and a movable rod (667). Multiple fixing blocks (661) are respectively fixedly installed on the inner walls of both sides of the inner shell (61), and two blocks are respectively located on both sides of the first electromagnetic module (64) and the second electromagnetic module (65). The multiple fixing blocks (661) are L-shaped, and grooves (662) are respectively provided on the L-shaped fixing blocks (661). The first slide rod (663) and the second slide rod (664) are respectively slidably installed at both ends of the L-shaped fixing blocks (661), and the first slide rod (663) and the second slide rod (664) are respectively slidably installed at both ends of the L-shaped fixing blocks (661). One end of the slide rod (664) is located in the groove (662), the second slide rod (664) is located above the moving plate (62), the two ends of the connecting rod (665) are respectively hinged to one end of the first slide rod (663) and the second slide rod (664) through connecting pins (666), the other end of the first slide rod (663) is hinged to one end of the movable rod (667), and the other ends of the plurality of movable rods (667) are respectively hinged to the adjacent sliding ring (6412) and moving ring (652).

7. The semi-rigid base asphalt pavement crack detection device as described in claim 6, characterized in that: The drive assembly (7) includes a drive motor (71), a first wheel (72), a connecting bracket (73), a rotating screw (74), a second wheel (75), a first belt (76), a rotating lead screw (77), a third wheel (78), and a second belt (79). The drive motor (71) is fixedly installed on the top of the inner shell (61). The output end of the drive motor (71) is fixedly installed with a first rotating wheel (72). The two connecting brackets (73) are respectively fixedly installed on the outer wall of the inner shell (61), and the two connecting brackets (73) are located on one side of the first electromagnetic module (64). The two connecting brackets (73) are rotatably installed with rotating screws (74). The rotating screws (74) are respectively meshed with multiple rotating gears (645). A second rotating wheel (75) is installed at one end of the rotating screw (74), and the second rotating wheel (75) is connected to the first rotating wheel (72) through a first belt (76). The rotating lead screw (77) is rotatably installed on the outer wall of the inner shell (61) and is located on the same vertical plane as the drive motor (71). A third rotating wheel (78) is installed on the rotating lead screw (77), and the third rotating wheel (78) is connected to the first rotating wheel (72) through a second belt (79).

8. The semi-rigid base asphalt pavement crack detection device as described in claim 7, characterized in that: The cleaning assembly (5) includes a drive shaft (51), a drive gear (52), a rotating cylinder (53), a brush rod (54), and a rectangular shell (55). The two ends of the drive shaft (51) are rotatably mounted on the inner wall of the housing (1). A drive gear (52) is fixedly mounted in the middle of the drive shaft (51), and the drive gear (52) meshes with the rotating screw (77). Rotating cylinders (53) are fixedly mounted on both ends of the drive shaft (51). Multiple brush rods (54) are arranged in a circular array around the axis on the two rotating cylinders (53). The rectangular shell (55) is fixedly mounted on the outer wall of the inner shell (61), and the drive gear (52) is located inside the rectangular shell (55).

9. The semi-rigid base asphalt pavement crack detection device as described in claim 7, characterized in that: The second rotating wheel (75) is connected to the rotating screw (74) via the first ratchet, and the third rotating wheel (78) is connected to the rotating lead screw (77) via the second ratchet, and the first ratchet and the second ratchet rotate in opposite directions.

10. The semi-rigid base asphalt pavement crack detection device as described in claim 7, characterized in that: The handrail (4) is provided with an adjustment button and a cleaning button, which are electrically connected to the control unit (3). The drive motor (71), detection sensor (631), electric disk (642) and electromagnet (653) are electrically connected to the control unit (3).

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