Full-thickness disease detection device for highway asphalt pavement

Abstract

The invention relates to the technical field of asphalt pavement damage detection, in particular to a highway asphalt pavement full-thickness disease detection device which comprises a ground penetrating radar and a protective cover. The protection cover is of a rectangular flat plate structure, the protection cover is horizontally arranged below the ground penetrating radar, and the detection device further comprises a reciprocating unit and a cleaning device; the reciprocating unit is arranged at one end of the protection cover and used for driving the protection cover to reciprocate in the length direction of the protection cover. The number of the cleaning devices is two, and the two cleaning devices are horizontally arranged in the length direction of the protection cover and are arranged on the two sides of the ground penetrating radar respectively. The cleaning device comprises a scraping strip, a driving unit and a cleaning unit; the scraping strip is arranged below the protective cover and can move in the vertical direction; the driving unit is arranged on one side of the scraping strip; the cleaning unit is arranged on one side of the scraping strip. The overall efficiency of asphalt pavement disease detection is improved, abrasion of parts is avoided, and the cleaning effect is also improved.

Description

Technical Field

[0001] This invention relates to the field of asphalt pavement damage detection technology, specifically to a device for detecting full-thickness defects in asphalt pavement of highways. Background Technology

[0002] Asphalt pavements on highways require regular flaw detection. Existing flaw detection methods mainly include ground-penetrating radar, video inspection, and laser structure depth measurement.

[0003] Chinese Patent Publication No. CN214953194U discloses a non-destructive infrared flaw detection device for recycled asphalt pavement, including a mounting plate. Support rods are fixedly connected to the four corners of the upper surface of the mounting plate. A fixing plate is fixedly connected to the top of each support rod. Electric push rods are fixedly connected to both ends of the lower surface of the fixing plate. A movable box is fixedly connected to the bottom of each electric push rod. Multiple through slots arranged in an equally spaced annular array are opened at the bottom of the movable box. Movable rods are inserted into the through slots. A conical block is fixedly connected to the bottom of each movable rod. An electromagnetic heating coil is provided at the bottom of the conical block. A rotating rod is movably connected to the middle of the top of the inner side of the movable box via a bearing. A turntable is fixedly connected to the bottom of the rotating rod. A planar thread is provided at the bottom of the turntable. A limiting plate is fixedly connected to the top of the movable rod. The top of the limiting plate is threaded, and the thread is compatible with the planar thread. An infrared probe is fixedly connected to the middle of the bottom of the movable box. A protective cover is provided on the outside of the infrared probe.

[0004] The above-mentioned method uses a laser-based structural depth gauge, but this method has limitations; it can only detect flaws on the surface of asphalt pavements and cannot detect flaws inside the pavement. In existing technologies, the most efficient method for detecting flaws inside asphalt pavements is the radar method. This method transmits high-frequency electromagnetic pulses to penetrate the pavement, receives the reflected waves, and analyzes abrupt changes in the dielectric constant of the pavement structure. To protect the radar, a protective cover is usually installed outside it. Since it is mainly used for highway inspection, the protective cover is made of dielectric material and is transparent. During use, dust from the road surface or some splashed water droplets can adhere to the protective cover, causing it to become dirty. This dirt significantly affects radar detection, leading to signal attenuation, distortion, reduced detection depth, and even deviations in the location of detected damage. Summary of the Invention

[0005] To address the aforementioned issues, a full-thickness asphalt pavement defect detection device for highways is provided. A reciprocating unit drives a rectangular flat protective cover to move back and forth along its length. This, combined with dual cleaning devices horizontally arranged on both sides of the ground-penetrating radar, enables a continuous "detection and cleaning simultaneously" operation. This design allows for timely cleaning of the protective cover surface without interrupting the detection process, effectively solving the drawback of traditional devices requiring shutdown for cleaning. This allows the ground-penetrating radar to adapt to the long-term, high-intensity detection needs of highways, significantly improving the overall efficiency of asphalt pavement defect detection. Furthermore, the "contact-disengagement" mechanism between the scraper and the protective cover prevents component wear.

[0006] To address the problems of existing technologies, this invention provides a full-thickness defect detection device for asphalt pavement on highways, including a ground-penetrating radar and a protective cover; The protective cover is a rectangular flat plate structure, and the protective cover is horizontally set below the ground penetrating radar. The detection device also includes a reciprocating unit and a cleaning device. The reciprocating unit is located at one end of the protective cover and is used to drive the protective cover to reciprocate along its own length. There are two cleaning devices, which are arranged horizontally along the length of the protective cover, and are respectively located on both sides of the ground penetrating radar. The cleaning device includes a scraper, a drive unit, and a cleaning unit; The scraper is positioned below the protective cover and can move vertically. When the protective cover moves toward the scraper, there is a gap between the scraper and the protective cover in the vertical direction. When the protective cover moves away from the scraper, the scraper contacts and slides with the protective cover. The drive unit is located on one side of the scraper and is used to drive the scraper to move; The cleaning unit is located on one side of the scraper, and the protective cover moving toward the scraper passes through the scraper first and then through the cleaning unit.

[0007] Preferably, the cleaning device further includes a housing that covers the outside of the scraper and the cleaning unit.

[0008] Preferably, the drive unit includes a swing plate, a hinge ring, and a drive assembly; The swing plate is located on the side of the housing, with the swing end and the drive end at both ends, and the scraper is fixedly installed on the swing end. The hinge ring is fixedly mounted on the swing plate, and the swing plate is hinged to the outer shell through the hinge ring; The drive assembly is connected to the drive end of the swing plate, and the drive assembly is used to drive the swing plate to swing with the hinge ring.

[0009] Preferably, the swing end of the swing plate is always tilted upward, the outer shell sidewall on which the swing plate is provided is inclined, and the swing plate and the outer shell sidewall form a flow guide slope.

[0010] Preferably, the cleaning device further includes a skin, the two ends of which are fixedly connected to the swing end of the swing plate and the outer wall of the housing, respectively.

[0011] Preferably, the upper end of the scraper is composed of multiple scraping parts arranged along the thickness direction of the scraper.

[0012] Preferably, the drive assembly includes a first rotary driver, and a placement chamber extending into the interior of the housing is vertically disposed at the bottom of the housing, with the first rotary driver disposed within the placement chamber.

[0013] Preferably, the cleaning unit includes a wiping roller, which is disposed on one side of the scraper and rotates around its own axis. The axis of the wiping roller is parallel to the width direction of the protective cover.

[0014] Preferably, the cleaning unit further includes a drive tube and a water outlet; The drive tube passes through the wiping roller along its axis, and the wiping roller rotates synchronously with the drive tube. The wiping roller is made of absorbent material. The water outlet is drilled through the drive pipe along its radial direction.

[0015] Preferably, one end of one of the cleaning devices has a windward side, and a guide wedge is provided on the windward side.

[0016] The advantages of this invention compared to the prior art are: 1. This invention utilizes a reciprocating unit to drive a rectangular flat protective cover to move back and forth along its length. This, combined with the alternating operation of dual cleaning devices horizontally arranged on both sides of the ground-penetrating radar, enables a continuous "detection and cleaning" mode. This design allows for timely cleaning of the protective cover surface without interrupting the detection process, effectively solving the drawback of traditional devices requiring shutdown for cleaning. This allows the ground-penetrating radar to adapt to the long-term, high-intensity detection needs of highways, significantly improving the overall efficiency of asphalt pavement defect detection. Simultaneously, the "contact-disengagement" interaction between the scraper and the protective cover prevents component wear and ensures effective cleaning of the protective cover.

[0017] 2. The wiping rollers, made of absorbent material, in the cleaning unit, are driven by a water supply and rotate synchronously to thoroughly wipe away stubborn dirt such as dust, grit, and oil from the surface of the protective cover. Residual water is then precisely removed by flexible scrapers with multiple scraping sections. This cleaning process eliminates the obstruction of high-frequency electromagnetic pulse transmission by dirt, avoiding signal attenuation, distortion, and reduced detection depth. It improves the accuracy of identifying the location, size, and depth of damage, providing reliable data for subsequent maintenance.

[0018] 3. Through the coordinated design of the outer shell protection, guide ramp, skin and guide wedge, the airflow is effectively guided and turbulence is reduced, which reduces the risk of secondary dust adhesion and stone impact on the protective cover; at the same time, the waterproof layout of the drive components eliminates the need for special waterproofing treatment, which not only extends the service life of the core components of the equipment, but also reduces maintenance costs, indirectly ensuring the scientific nature of road maintenance decisions and road traffic safety. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the highway asphalt pavement full thickness defect detection device of the present invention when arranged in groups.

[0020] Figure 2 This is a side view of the highway asphalt pavement full thickness defect detection device of the present invention when airflow passes through the device as the vehicle moves.

[0021] Figure 3 This is a front view of the highway asphalt pavement full thickness defect detection device of the present invention.

[0022] Figure 4 This invention relates to a full-thickness asphalt pavement defect detection device for highways. Figure 3 Schematic diagram of cross-section at point AA.

[0023] Figure 5 This invention relates to a full-thickness asphalt pavement defect detection device for highways. Figure 4 A magnified view of a portion of point B in the middle.

[0024] Figure 6 This is a cross-sectional three-dimensional schematic diagram of the highway asphalt pavement full thickness defect detection device of the present invention.

[0025] Figure 7 This is a three-dimensional schematic diagram of the highway asphalt pavement full thickness defect detection device of the present invention after removing the upper shell and ground penetrating radar.

[0026] Figure 8 This is a cross-sectional three-dimensional schematic diagram of the cleaning device in the full-thickness asphalt pavement defect detection device of the present invention.

[0027] Figure 9 This is a three-dimensional schematic diagram of the cleaning device after removing the outer shell of the highway asphalt pavement full thickness defect detection device of the present invention.

[0028] The following are the labels in the diagram: 1. Protective cover; 2. Reciprocating unit; 3. Scraper; 31. Drive unit; 311. Swing plate; 312. Hinge ring; 313. First rotary actuator; 314. Drive arm; 315. Slide groove; 316. Extension column; 32. Scraping part; 4. Cleaning unit; 41. Wiping roller; 42. Drive tube; 421. Water outlet; 43. Gear ring; 44. Gear; 45. Second rotary actuator; 5. Outer shell; 51. Skin; 52. Placement chamber; 6. Guide wedge. Detailed Implementation

[0029] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0030] Reference Figures 1-7 : A full-thickness asphalt pavement defect detection device for highways, including ground-penetrating radar and a protective cover 1; The protective cover 1 is a rectangular flat plate structure. The protective cover 1 is horizontally set below the ground penetrating radar. The detection device also includes a reciprocating unit 2 and a cleaning device. The reciprocating unit 2 is located at one end of the protective cover 1 and is used to drive the protective cover 1 to reciprocate along its own length. There are two cleaning devices, which are arranged horizontally along the length of the protective cover 1, and are respectively located on both sides of the ground penetrating radar. The cleaning device includes a scraper 3, a drive unit 31, and a cleaning unit 4; The scraper 3 is positioned below the protective cover 1 and can move vertically. When the protective cover 1 moves toward the scraper 3, there is a gap between the scraper 3 and the protective cover 1 in the vertical direction. When the protective cover 1 moves away from the scraper 3, the scraper 3 contacts and slides with the protective cover 1. The drive unit 31 is disposed on one side of the scraper 3 and is used to drive the scraper 3 to move; The cleaning unit 4 is located on one side of the scraper 3. The protective cover 1, which moves toward the scraper 3, passes through the scraper 3 first and then through the cleaning unit 4.

[0031] Since this invention is mainly used for detecting asphalt pavement on highways, the protective cover 1 installed at the end of the ground-penetrating radar is prone to getting dirty. Therefore, in actual operation, it is difficult to maintain the cleanliness of the protective cover 1 for a long time. Highway pavement is exposed to the natural environment all year round, and will continuously accumulate fine particles such as dust, gravel, and tire wear debris. When the detection vehicle travels at high speed, the airflow will quickly carry these particles to the surface of the protective cover 1, forming a uniform or locally concentrated dust layer. If it is rainy or there are water accumulations on the road, the splashing water droplets generated by the wheels will directly adhere to the cover. After some of the water droplets evaporate, they will leave a mixture of water stains and dirt. After long-term use under complex road conditions, these pollutants will further combine with road surface oil and airborne dust to form stubborn stains that are difficult to remove naturally, gradually destroying the transparency of the protective cover 1.

[0032] These seemingly insignificant contaminants can have a significant negative impact on radar detection. First, signal transmission is obstructed. The layer of dirt acts as an additional barrier between the radar and the road surface. When high-frequency electromagnetic pulses penetrate this barrier, some of their energy is absorbed or scattered, causing significant signal attenuation. Pulse signals that could originally penetrate several meters deep may fail to reach deeper structures due to energy loss, directly resulting in a substantial reduction in detection depth. In severe cases, the detection range may be reduced to less than half of the design standard.

[0033] Secondly, dirt can cause signal distortion. Differences in the thickness and composition of dirt at different locations can lead to inconsistent penetration paths and refraction angles of electromagnetic pulses in different areas, resulting in distortions in the phase and amplitude of the reflected wave signal. When this distorted signal is received by the equipment, it interferes with the system's judgment of abrupt changes in the dielectric constant of the road surface structure. This not only makes it difficult to accurately identify the actual size and severity of the damage but also leads to inaccurate identification of the damage location.

[0034] More importantly, location deviations and data distortions can directly mislead subsequent highway maintenance decisions. If the location of damage is misjudged, maintenance operations may lack precision, with areas already showing signs of problems failing to receive targeted repairs, while undamaged areas undergo unnecessary construction, resulting in a waste of human and material resources. At the same time, reduced detection depth may lead to the omission of major hidden dangers such as deep cracks and cavities. These undetected damages will continue to worsen under the continuous effects of vehicle loads and the natural environment, potentially causing serious road surface defects such as collapse and cracking, threatening road safety.

[0035] To avoid the aforementioned issues, the existing detection device was redesigned. A cleaning device was added to the lower part of the protective cover 1, allowing it to periodically clean the end of the protective cover 1 without leaving water stains on its surface. This prevents water stains from affecting the ground-penetrating radar's detection results and ensures that the ground-penetrating radar remains operational during the cleaning process, thus guaranteeing its ability to withstand long-term detection operations. The specific structure and operation of this invention are as follows: The ground-penetrating radar is mounted on the upper part of the protective cover 1, which is a rectangular flat plate structure. Driven by the reciprocating unit 2, the protective cover 1 can reciprocate along its length. In existing technology, the reciprocating unit 2 can be of various types, such as a servo electric cylinder or a reciprocating rotary mechanism. In actual use, the appropriate reciprocating unit 2 can be selected according to actual needs. Two cleaning devices are installed at the lower part of the protective cover 1, located on both sides of the ground-penetrating radar. The cleaning devices do not obstruct the front end of the ground-penetrating radar. During routine detection operations, the detection device is towed by a vehicle and moves synchronously with it. The protective cover 1 reciprocates periodically under the drive of the reciprocating unit 2.

[0036] When the protective cover 1 moves along its length toward one of the scraper strips 3, the scraper strip 3 disengages from the protective cover 1 under the driving action of the drive unit 31. At this time, there is a gap between the scraper strip 3 and the end face of the protective cover 1 in the vertical direction, and the moving protective cover 1 will not contact the scraper strip 3. At this time, the end face of the protective cover 1 that passes over the scraper strip 3 is covered with dirt. The protective cover 1 that passes over the scraper strip 3 is cleaned by the cleaning unit 4. The cleaning unit 4 cleans the surface of the protective cover 1 with cleaning agent or water. The surface of the protective cover 1 after cleaning is called the cleaning area, and the area of ​​the protective cover 1 at the front end of the detection radar is called the detection area. The cleaning area is larger than the detection area. Although the end face of the protective cover 1 is no longer dirty after cleaning, water stains remain. To prevent the water stains from being carried to the front of the ground penetrating radar after the protective cover 1 resets, the drive unit 31 drives the scraper 3 to rise after the protective cover 1 resets. When the cleaning area passes over the scraper 3, the scraper 3 contacts the end face of the protective cover 1 and slides in cooperation with it. As the protective cover 1 continues to move, the scraper 3 scrapes away the water stains adhering to the end face of the protective cover 1, thus preventing water stains from remaining on the end face of the protective cover 1. As the protective cover 1 resets, the cleaning area after the water stains have been scraped away by the scraper 3 is at the front of the ground penetrating radar, at which point the cleaning area becomes the detection area. This meets the requirements for long-term operation of the detection radar, and at the same time, the drive unit 31 drives the scraper 3 to contact or detach from the protective cover 1, extending the service life of the scraper 3. This is because when a protective cover 1 with stains passes over a scraper 3, if the scraper 3 does not separate from the protective cover 1, the stains on the protective cover 1 will cause wear on the scraper 3. In addition, the detached stains will also adhere to the scraper 3. When a protective cover 1 with water stains passes over a scraper 3, the damaged scraper 3 will not only fail to completely remove the water stains from the protective cover 1, but the remaining stains on the scraper 3 will also mix with the water stains on the protective cover 1, forming a mud layer on the end face of the protective cover 1. Therefore, the contact and separation between the scraper 3 and the protective cover 1 can also prevent the scraper 3 from being adhered to by stains, thereby preventing the scraper 3 from coating the end face of the protective cover 1 with stains when scraping water from the cleaned protective cover 1.

[0037] Reference Figures 2-4 The cleaning device also includes a housing 5, which covers the outside of the scraper 3 and the cleaning unit 4.

[0038] Because the cleaning device is located below the protective cover 1, it is close to the ground. During the cleaning process, dust from the road surface easily mixes with water stains and re-adheres to the surface of the protective cover 1. To avoid this situation, an outer shell 5 is installed over the cleaning device.

[0039] Reference Figure 8 and Figure 9 The drive unit 31 includes a swing plate 311, a hinge ring 312, and a drive assembly; The swing plate 311 is disposed on the side of the housing 5, and the two ends of the swing plate 311 are the swing end and the drive end, respectively. The scraper 3 is fixedly disposed on the swing end. The hinge ring 312 is fixedly mounted on the swing plate 311, and the swing plate 311 is hinged to the outer shell 5 through the hinge ring 312. The drive assembly is connected to the drive end of the swing plate 311, and the drive assembly is used to drive the swing plate 311 to swing with the hinge ring 312.

[0040] The drive assembly includes a first rotary driver 313, a drive arm 314, a slide groove 315, and an extension column 316. The first rotary driver 313 is horizontally disposed on one side of the swing plate 311. One end of the drive arm 314 is fixedly disposed on the output end of the first rotary driver 313. The slide groove 315 is formed on the drive arm 314 along its length. The extension column 316 is fixedly disposed on the drive end of the swing plate 311 and extends into the slide groove 315, slidingly engaging with the slide groove 315. The first rotary driver 313 is preferably a servo motor. The first rotary driver 313 is used to drive the drive arm 314 to reciprocate, thereby causing the drive end of the swing plate 311 to swing, thus realizing the swing of the swing plate 311 and ensuring that the scraper 3 can rise and fall in the vertical direction. Here, the rise and fall of the scraper 3 in the vertical direction refers to the displacement of the scraper 3 in the vertical direction with the swing end when the swing plate 311 swings. In actual operation, the scraper 3 rotates around the hinge ring 312 with the swing plate 311. It is worth noting that since the scraper 3 is made of flexible material, when the scraper 3 is lifted by the swing plate 311 and comes into contact with the protective cover 1, the scraper 3 will bend, so there will be no situation where the scraper 3 and the end face of the protective cover 1 are not properly connected.

[0041] Reference Figures 1-9 The swing end of the swing plate 311 is always tilted upward, and the side wall of the outer shell 5 on which the swing plate 311 is provided is tilted. The swing plate 311 and the side wall of the outer shell 5 form a flow guide slope.

[0042] Since the detection device needs to move synchronously with the vehicle, when the vehicle is driving on the highway, the airflow will impact the outer shell 5. By tilting the swing plate 311, the swing plate 311 and the side wall of the outer shell 5 form a guide slope, which avoids the airflow directly hitting the outer shell 5, avoids turbulence around the outer shell 5, and also reduces the probability of stones hitting the protective cover 1 under the action of turbulence.

[0043] Reference Figure 5 and Figure 6 The cleaning device also includes a skin 51, the two ends of which are fixedly connected to the swing end of the swing plate 311 and the outer wall of the outer casing 5, respectively.

[0044] By setting the skin 51, the streamline shape of the guide ramp is optimized, avoiding the formation of turbulence in the airflow at the hinge ring 312.

[0045] Reference Figure 5 The upper end of the scraper 3 is composed of multiple scraping parts 32 arranged along the thickness direction of the scraper 3.

[0046] It improves the removal effect of water stains on the end face of the protective cover 1 and the scraper 3.

[0047] Reference Figure 8 The drive assembly includes a first rotary driver 313, and a placement chamber 52 extending into the interior of the housing 5 is vertically disposed at the bottom of the housing 5. The first rotary driver 313 is disposed in the placement chamber 52.

[0048] The first rotary actuator 313 is disposed within the placement chamber 52 rather than directly within the housing 5, preventing water from dripping onto the first rotary actuator 313 after cleaning with water or detergent from the cleaning unit 4. This eliminates the need for special waterproofing treatment of the first rotary actuator 313, reducing production costs. Furthermore, placing the first rotary actuator 313 within the placement chamber 52 prevents it from protruding from the external side wall of the housing 5, ensuring a better streamlined shape for the housing 5.

[0049] Reference Figure 5 The cleaning unit 4 includes a wiping roller 41, which is disposed on one side of the scraper 3. The wiping roller 41 rotates around its own axis, and the axis of the wiping roller 41 is parallel to the width direction of the protective cover 1.

[0050] When the wiping roller 41 cleans the end face of the protective cover 1, the wiping roller 41 is in a rotating state.

[0051] Reference Figure 5 , Figure 8 and Figure 9 The cleaning unit 4 also includes a drive tube 42 and a water outlet 421; The drive tube 42 passes through the wiping roller 41 along the axis of the wiping roller 41. The wiping roller 41 rotates synchronously with the drive tube 42. The wiping roller 41 is made of absorbent material. The water outlet 421 is opened through the drive pipe 42 in the radial direction.

[0052] The cleaning unit 4 also includes a gear ring 43, a gear 44, and a second rotary driver 45. The gear ring 43 is fixedly mounted at the end of the drive tube 42. The gear 44 is rotatably mounted on one side of the gear ring 43 and meshes with the gear ring 43. The second rotary driver 45 is mounted at the end of the gear 44. The second rotary driver 45 is preferably a servo motor. The second rotary driver 45 drives the gear ring 43 to rotate through the gear 44. A water supply system is provided at one end of the drive tube 42. The water supply system and the drive tube 42 are connected by a rotary joint. The water supply system supplies water to the drive tube 42 when the wiping roller 41 rotates. The water flows out through the water outlet 421 and wets the wiping roller 41. The wetted wiping roller 41 has a better cleaning effect on the protective cover 1.

[0053] Reference Figure 1 and Figure 2 One of the cleaning devices has a windward side at one end, and a guide wedge 6 is provided on the windward side.

[0054] When the vehicle moves the detection device, the airflow is not prone to turbulence when passing through the two cleaning devices, thanks to the guidance of the guide wedge 6.

[0055] Working principle: As detection work continues, the surface of the protective cover 1 will gradually become contaminated with road dust, gravel, tire debris, or splashes of water and oil mixtures from rainy weather operations. When the contamination accumulates to a level that may affect the detection signal, the reciprocating unit 2 is activated, driving the protective cover 1 to move along its own length toward a cleaning device on one side. At this time, the detection area on the protective cover 1 still maintains normal detection, ensuring the continuity of the operation.

[0056] As the protective cover 1 moves toward the scraper 3 of the target cleaning device, the drive unit 31 of the cleaning device drives the scraper 3 to swing downwards, creating a gap between the scraper 3 and the protective cover 1, preventing dirt from directly contacting the scraper 3 and causing wear or stains. The protective cover 1 continues to move, and its dirty area passes through the cleaning unit 4: the water supply system supplies water to the drive pipe 42 through a rotary joint, and the water flows through the radial water outlet 421 of the drive pipe 42 to wet the water-absorbing wiping roller 41. At the same time, the second rotary drive 45 drives the drive pipe 42 and the wiping roller 41 to rotate synchronously through the gear 44 and the gear ring 43. The rotating wet wiping roller 41 wipes the surface of the protective cover 1 in all directions, thoroughly removing dust, oil, stubborn stains and other pollutants, forming a clean cleaning area.

[0057] After cleaning, the reciprocating unit 2 drives the protective cover 1 to reset in the reverse direction. At this time, the drive unit 31 drives the scraper 3 to swing upward, so that the scraper 3 makes close contact with the lower surface of the protective cover 1. Since the scraper 3 is made of flexible material and has multiple scraping parts 32 at its upper end, the scraper 3 will slide along the cover body during the reset movement of the protective cover 1, effectively scraping away the water stains remaining after cleaning and preventing the water stains from forming a new signal interference layer. At the same time, the guide ramp formed by the outer shell 5 and the skin 51 of the cleaning device, and the guide wedge 6 on the windward side, effectively guide the airflow, reduce the secondary adhesion of road dust caused by turbulence, and the drive components placed in the chamber 52 prevent the erosion of the cleaning water flow.

[0058] After the protective cover 1 is reset, the cleaned area, which has been cleaned and wiped dry, moves directly below the ground penetrating radar and becomes a new detection area. The original detection area moves with the protective cover 1 to the cleaning device area on the other side, waiting for the next round of cleaning. The cleaning devices on both sides work alternately, coordinating with the reciprocating movement of the protective cover 1, to achieve a continuous operation mode of "detecting and cleaning simultaneously".

[0059] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection 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 all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A device for detecting full-thickness diseases of highway asphalt pavement, comprising a ground penetrating radar and a protective cover (1); characterized in that The protective cover (1) is a rectangular plate structure, and the protective cover (1) is horizontally arranged below the ground penetrating radar; the device further comprises a reciprocating unit (2) and a cleaning device; The reciprocating unit (2) is arranged at one end of the protective cover (1) and is used for driving the protective cover (1) to reciprocate along the length direction of the protective cover (1); The cleaning device is provided with two cleaning devices, and the two cleaning devices are horizontally arranged along the length direction of the protective cover (1) and are arranged at two sides of the ground penetrating radar respectively; The cleaning device comprises a scraping strip (3), a driving unit (31) and a cleaning unit (4); The scraping strip (3) is arranged below the protective cover (1) and can be displaced in the vertical direction; when the protective cover (1) moves towards the scraping strip (3), the scraping strip (3) and the protective cover (1) have a gap in the vertical direction; when the protective cover (1) moves away from the scraping strip (3), the scraping strip (3) is in sliding cooperation with the protective cover (1); The driving unit (31) is arranged at one side of the scraping strip (3) and is used for driving the scraping strip (3) to move; The cleaning unit (4) is arranged at one side of the scraping strip (3), and the protective cover (1) moving towards the scraping strip (3) passes through the scraping strip (3) and then passes through the cleaning unit (4).

2. The highway asphalt pavement full-thickness disease detection device according to claim 1, characterized in that, The cleaning device further comprises an outer shell (5), and the outer shell (5) is arranged outside the scraping strip (3) and the cleaning unit (4).

3. The highway asphalt pavement full-thickness disease detection device according to claim 2, characterized in that, The driving unit (31) comprises a swing plate (311), a hinge ring (312) and a driving assembly; The swing plate (311) is arranged at the side of the outer shell (5), and the two ends of the swing plate (311) are respectively a swing end and a driving end; the scraping strip (3) is fixedly arranged on the swing end; The hinge ring (312) is fixedly arranged on the swing plate (311), and the swing plate (311) is hingedly connected with the outer shell (5) through the hinge ring (312); The driving assembly is connected with the driving end of the swing plate (311), and the driving assembly is used for driving the swing plate (311) to swing with the hinge ring (312).

4. The highway asphalt pavement full-thickness disease detection device according to claim 3, characterized in that, The swing end of the swing plate (311) is always inclined upward, the side wall of the outer shell (5) in which the swing plate (311) is arranged is inclined, and the swing plate (311) and the side wall of the outer shell (5) form a guide slope.

5. The highway asphalt pavement full-thickness disease detection device according to claim 4, characterized in that, The cleaning device further comprises a skin (51), and the two ends of the skin (51) are fixedly connected with the swing end of the swing plate (311) and the outer wall of the outer shell (5) respectively.

6. The highway asphalt pavement full-depth distress detector of claim 1, wherein, The upper end of the scraping strip (3) is composed of a plurality of scraping parts (32) arranged in the thickness direction of the scraping strip (3).

7. The highway asphalt pavement full-depth distress detector of claim 3, wherein, The driving assembly comprises a first rotary driver (313), a placing bin (52) extending into the inner part of the outer shell (5) is vertically arranged at the bottom of the outer shell (5), and the first rotary driver (313) is arranged in the placing bin (52).

8. The highway asphalt pavement full-depth distress detector of claim 1, wherein, The cleaning unit (4) comprises a wiping roller (41), the wiping roller (41) is arranged at one side of the scraping strip (3), the wiping roller (41) rotates around its axis, and the axis of the wiping roller (41) is parallel to the width direction of the protective cover (1).

9. The highway asphalt pavement full-depth distress detector of claim 8, wherein, The cleaning unit (4) further comprises a driving pipe (42) and a water outlet hole (421). The driving pipe (42) penetrates the wiping roller (41) along the axis of the wiping roller (41), the wiping roller (41) rotates synchronously with the driving pipe (42), and the wiping roller (41) is made of water-absorbing material; The water outlet hole (421) is arranged on the driving pipe (42) and penetrates the driving pipe (42) in the radial direction of the driving pipe (42).

10. The highway asphalt pavement full-depth distress detector of claim 1, wherein, One end of one of the cleaning devices has a windward side, and a flow guide wedge (6) is arranged on the windward side.

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