Road construction structure layer thickness detection device

Abstract

A device for detecting the thickness of a road construction structural layer relates to the field of road detection technology and solves the problem of inaccurate structural layer thickness detection results due to road inclination. The device comprises a frame with a core sampling mechanism, a leveling mechanism and a sweeping mechanism. The leveling mechanism comprises a leveling motor, a drive shaft, a linkage assembly, a driven shaft, a lifting sleeve, a leveling shaft, a laser emitter and a laser tracker. The drive shaft is located at the output end of the leveling motor, the linkage assembly is located between the drive shaft and the driven shaft, a roller connection is provided at the bottom of the lifting sleeve, the leveling shaft is rotatably connected to the frame and is threadedly engaged with the lifting sleeve, and a bevel gear set is provided between the upper end of the leveling shaft and the driven shaft; the sweeping mechanism comprises a driving gear, a driven gear, a fan gear and a sweeping brush. The present invention realizes the leveling of the detection device by setting a leveling mechanism, thereby ensuring that the core sample taken out is regular, and then ensuring the accuracy of the thickness measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of road detection, in particular to a device for detecting the thickness of a road construction structure layer. Background Art

[0002] Road construction structural layers include different structural layers such as roadbed, base layer, and surface layer. The thickness of the road structural layer is a key factor affecting the bearing capacity, durability, and flatness of the road surface. After the road is paved, it is necessary to core the road to detect the thickness of its structural layer.

[0003] The existing technology for detecting the thickness of road construction structural layers has the following defects: First, traditional core drilling equipment mainly relies on manpower to drive the core drilling mechanism downward to drill into the road surface, which requires a lot of physical strength and has low work efficiency. At the same time, it is difficult to maintain a uniform drilling speed, which causes the core sample to easily break, shatter, or even get stuck. This not only affects the measurement results, but also easily causes uneven force on the drill bit and damages the drill bit. Second, after the measurement is completed, the sample is stuck inside the drill bit, requiring manual sampling and the use of external tools, making sampling difficult. In order to overcome defect one, a highway structural layer thickness detection device with application number 2024219989823 is proposed. By turning on the motor, the two pulleys and the drill barrel are driven to rotate in turn. At the same time, the horizontal bevel gear drives the vertical bevel gear and two gears to rotate in turn, thereby driving the support rod, fixed plate and slide plate downward to achieve the downward movement of the core. During the entire process, no additional force is required from the worker, saving manpower. The constant motor speed makes the downward movement speed of the drill barrel constant, avoiding problems such as core sample breakage, shattering, and drill sticking, and achieving efficient core drilling. In order to overcome the second defect, an asphalt layer thickness detection device for asphalt road pavement with application number 2024106273631 is proposed. The thickness of the extracted asphalt layer is judged by a scale engraved on a transparent cover-shaped drill bit. It is convenient and quick. After the measurement is completed, the drill bit is downward, the limit rod slides outward, and the gravity column is prompted to hammer down the asphalt layer extract, so that the asphalt layer sample can be hammered down for sampling.

[0004] While these existing technologies overcome these limitations, they still suffer from the following drawbacks: Inclined or uneven construction surfaces can cause the detection device to tilt, leading to skewed core samples during core sampling and inaccurate results for structural layer thickness measurements. Furthermore, debris such as stones left on the road surface during construction can also cause the detection device to shake or tilt, further compromising detection accuracy. Summary of the Invention

[0005] The purpose of the present invention is to provide a road construction structural layer thickness detection device to solve the problem that the entire detection device is tilted due to the tilt or unevenness of the road surface, and then the sampling is skewed, resulting in inaccurate structural layer thickness detection results.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a road construction structural layer thickness detection device, comprising a frame, the frame having a core sampling mechanism; further comprising a leveling mechanism and a sweeping mechanism, the leveling mechanism comprising a leveling motor, a driving shaft, a linkage assembly, a driven shaft, a lifting sleeve, a leveling shaft, a laser emitter and a laser tracker, the leveling motor being rotatably mounted on the lower part of the frame through a driving source, the driving shaft being located at the output end of the leveling motor, the driven shaft being rotatably mounted on the lower part of the frame through a support seat, the linkage assembly being located between the driving shaft and the driven shaft for realizing the linkage action of the driving shaft and the driven shaft, the lifting sleeve being vertically arranged and having a roller at the bottom of the lifting sleeve, the leveling shaft being rotatably connected to the frame and being threadedly engaged with the lifting sleeve, a bevel gear set being provided between the upper end of the leveling shaft and the driven shaft; the laser emitter being located at the top of the support seat, and the laser tracker being located above the leveling motor; the sweeping mechanism comprising a driving gear , a driven gear, a sector gear and a cleaning brush, the driving gear is fixed to the output end of the driving source, the driven gear is rotatably mounted on the lower part of the frame and meshes with the driving gear, the sector gear is fixed on the adjusting rod and meshes with the driven gear, the adjusting rod is threadedly engaged with the lower part of the frame, the cleaning brush is fixed on the sector gear and is located outside the circumference of the roller; the laser tracker is mounted on the base plate through a balancing assembly, the balancing assembly includes a balancing plate and a counterweight ball, the balancing plate is fixed to the bottom of the laser tracker, the counterweight ball is fixed to the bottom of the balancing plate, the top of the base plate has a limiting ring located on the outer periphery of the balancing plate and a protrusion that contacts the counterweight ball, the protrusions are multiple and located on the same circumference; the driving source is a dual-axis motor, the dual-axis motor is fixed to the base plate, the upper output shaft of the dual-axis motor is fixed with a rotating seat, the leveling motor, the limiting ring and the protrusion are fixed on the rotating seat, and the lower output shaft of the dual-axis motor is fixedly connected to the driving gear.

[0007] Furthermore, the frame includes a top plate, a support rod and a bottom plate which are sequentially arranged and fixedly connected from top to bottom, and the core sampling mechanism is located on the top plate.

[0008] Furthermore, the core sampling mechanism includes a drilling drive unit and a metering drill barrel. The drilling drive unit includes a cylinder fixed on the top plate and a drive motor fixed on the cylinder piston rod. The metering drill barrel is located at the output end of the drive motor. The drilling drive unit drives the metering drill barrel to rotate and move up and down. The metering drill barrel is a transparent part with a scale on the outer wall.

[0009] Furthermore, the outer periphery of the lifting sleeve has a fixing rod fixedly connected to the bottom plate, and the side wall of the lifting sleeve has a sliding groove connected to the fixing rod for upward and downward sliding.

[0010] Furthermore, the linkage assembly includes an electromagnet, a magnetic block and a spring, the electromagnet is fixed at the end of the driving shaft, the first end of the spring is fixedly connected to the end of the driven shaft, and the second end of the spring is fixedly connected to the magnetic block. After the electromagnet and the magnetic block are aligned, the electromagnet is energized, and at this time, the electromagnet and the magnetic block are attracted to realize the linkage between the driving shaft and the driven shaft.

[0011] Furthermore, a push rod is fixedly connected to the top plate, and a tool box is provided on the top of the top plate.

[0012] Furthermore, the cleaning brush is an arc-shaped structure, one end of the cleaning brush is fixedly connected to the sector gear, and the bottom of the cleaning brush has bristles.

[0013] Furthermore, the electromagnet and the magnetic block have plug-in structures that plug into and fit with each other.

[0014] The beneficial effects of the present invention are as follows: by providing a laser emitter and a laser tracker in conjunction, the tilt of the detection device is detected in real time. By providing a leveling mechanism to drive the lifting and lowering of the lifting sleeve, the detection device is leveled, thereby ensuring the regularity of the core sample removed and the accuracy of the structural layer thickness measurement results. By providing a sweeping mechanism, the sweeping brush swings to remove debris such as road stones, thereby preventing the detection device from being shaken or tilted by road stones and debris, which in turn affects the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is one of the three-dimensional diagrams of the present invention;

[0016] Figure 2 This is the second three-dimensional diagram of the present invention;

[0017] Figure 3 A three-dimensional diagram of the frame of the present invention;

[0018] Figure 4 A three-dimensional diagram of a drilling drive unit of the present invention;

[0019] Figure 5 A three-dimensional diagram of the leveling mechanism of the present invention;

[0020] Figure 6 An exploded view of the leveling shaft and the lifting sleeve of the present invention;

[0021] Figure 7 For the present invention Figure 5 A local enlarged view of point A in FIG;

[0022] Figure 8 It is a three-dimensional diagram of the cleaning mechanism of the present invention.

[0023] In the figure: 1. Base plate; 2. Roller; 3. Support rod; 4. Top plate; 5. Drilling drive unit; 6. Measuring drill barrel; 61. Drill teeth; 7. Push rod; 8. Tool box; 9. Lifting sleeve; 91. Slide; 10. Leveling shaft; 11. Bevel gear set; 12. Leveling motor; 13. Drive shaft; 14. Driven shaft; 15. Electromagnet; 16. Spring; 17. Magnetic block; 18. Support seat; 19. Laser transmitter; 20. Dual-axis motor; 21. Rotating seat; 22. Laser tracker; 23. Balance plate; 24. Counterweight ball; 25. Limiting ring; 26. Driving gear; 27. Driven gear; 28. Adjusting rod; 29. ​​Cleaning brush; 30. Sector gear; 31. Protrusion; 32. Drill barrel positioning hole; 33. Cylinder; 34. Drive motor; 35. Fixing rod. DETAILED DESCRIPTION

[0024] like Figures 1 to 8 As shown, the present invention includes a frame, a core sampling mechanism, a leveling mechanism and a sweeping mechanism. The structure and working principle of the present invention are described in detail below with reference to the accompanying drawings.

[0025] like Figures 1 to 8 As shown, the road construction structure layer thickness detection device of the present invention includes a frame, which includes a top plate 4, a support rod 3 and a bottom plate 1 arranged in sequence from top to bottom and fixedly connected. The bottom plate 1 is a circular structure, and the top plate 4 is a rectangular structure. The top plate 4 and the bottom plate 1 are arranged parallel to each other. The support rod 3 is between the top plate 4 and the bottom plate 1. The upper end of the support rod 3 is fixedly connected to the top plate 4, and the lower end of the support rod 3 is fixedly connected to the bottom plate 1. The frame is provided with a core sampling mechanism. Specifically, the core sampling mechanism is located on the top plate 4. The core sampling mechanism includes a drilling drive unit 5 and a metering drill barrel 6. The drilling drive unit 5 is fixed to the top plate 4, as shown in FIG. Figure 4 As shown, the drilling drive unit 5 comprises a cylinder 33 and a drive motor 34. The cylinder 33 is fixed to the top plate 4, and the drive motor 34 is fixed to the piston rod of the cylinder 33. The metering drill barrel 6 is located at the output end of the drive motor 34. The extension and retraction of the piston rod of the cylinder 33 drives the drive motor 34 and the metering drill barrel 6 to move up and down. When the drive motor 34 is activated, the metering drill barrel 6 rotates. The drilling drive unit 5 then drives the metering drill barrel 6 to rotate and move up and down, thereby enabling core sampling of the road construction structural layer. The metering drill barrel 6 is a transparent member with a graduated outer wall. The drilling end of the metering drill barrel 6 has drill teeth 61, which facilitate penetration into the structural layer by breaking through the road. The base plate 1 has a circular drill barrel positioning hole 32, into which the metering drill barrel 6 is inserted, with the outer wall of the metering drill barrel 6 contacting the inner wall of the drill barrel positioning hole 32. The drill barrel positioning hole 32 guides the movement of the metering drill barrel 6.

[0026] In order to detect the inclination of the entire detection device and to be able to perform timely leveling after the detection device is tilted, the present invention is provided with a leveling mechanism. Figure 5 、 Figure 6 As shown, the leveling mechanism includes a leveling motor 12, a drive shaft 13, a linkage assembly, a driven shaft 14, a lifting sleeve 9, a leveling shaft 10, a laser emitter 19, and a laser tracker 22. The leveling motor 12 is rotatably mounted on the bottom plate 1 of the frame through a driving source. The drive shaft 13 is located at the output end of the leveling motor 12. When the leveling motor 12 is started, the drive shaft 13 rotates accordingly. The driven shaft 14 is rotatably mounted on the bottom plate 1 of the frame through a support base 18, as shown in FIG. Figure 3 As shown, three support seats 18 are fixedly mounted on the bottom plate 1 and are evenly arranged along the circumference. Figure 1 As shown, a driven shaft 14 is rotatably mounted on each support seat 18. The linkage assembly is located between the driving shaft 13 and the driven shaft 14 to achieve the linkage action of the driving shaft 13 and the driven shaft 14.

[0027] The linkage assembly includes an electromagnet 15, a magnet 17, and a spring 16. The electromagnet 15 is fixed to the end of the drive shaft 13. The first end of the spring 16 is fixedly connected to the end of the driven shaft 14, and the second end of the spring 16 is fixedly connected to the magnet 17. The spring 16, magnet 17, and driven shaft 14 are coaxially arranged. Because the leveling motor 12 is rotationally connected to the base plate 1, the drive shaft 13 and the electromagnet 15 rotate accordingly during the rotation of the leveling motor 12. During the rotation, the electromagnet 15 is aligned with the magnet 17 and then energized. At this time, the electromagnet 15 and the magnet 17 engage to achieve the linkage between the drive shaft 13 and the driven shaft 14, and the spring 16 is stretched. To further ensure the linkage between the drive shaft 13 and the driven shaft 14, the drive shaft 13 and the driven shaft 14 have a plug-in structure that plugs into and fits with each other. The plug-in structure includes an insert block at the end of the electromagnet 15 and a socket at the end of the magnetic block 17. The end of the insert block is chamfered or tapered to facilitate smooth insertion of the insert block into the socket. The lifting sleeve 9 is vertically arranged and fixedly connected to the wheel frame of the roller 2. The roller 2 can rotate relative to the lifting sleeve 9. The leveling shaft 10 is rotatably connected to the bottom plate 1 of the frame, and the lower end of the leveling shaft 10 is threadedly engaged with the lifting sleeve 9. A bevel gear set 11 is provided between the upper end of the leveling shaft 10 and the driven shaft 14. The bevel gear set 11 includes an active bevel gear fixed to the end of the driven shaft 14, and a driven bevel gear fixed to the upper end of the leveling shaft 10. When the driven shaft 14 rotates, the active bevel gear rotates accordingly, thereby driving the driven bevel gear to rotate, thereby driving the rotation of the leveling shaft 10, and thereby driving the lifting sleeve 9 to move up and down. To guide the up and down movement of the lifting sleeve 9, the outer periphery of the lifting sleeve 9 has a fixed rod 35 fixedly connected to the base plate 1, and the side wall of the lifting sleeve 9 has a sliding groove 91 connected to the fixed rod 35 for sliding up and down. When the lifting sleeve 9 moves up and down, it slides along the fixed rod 35.

[0028] like Figure 5 As shown, the laser emitter 19 is located on the top of the support base 18, and the laser tracker 22 is located above the leveling motor 12. The laser tracker 22 is installed on the base plate 1 through a balancing component, as shown in FIG. Figure 5 、 Figure 7 As shown, the balancing assembly includes a balancing plate 23 and a counterweight ball 24. The balancing plate 23 is fixed to the bottom of the laser tracker 22, while the counterweight ball 24 is fixed to the bottom of the balancing plate 23. The top of the base plate 1 has a retaining ring 25 located around the circumference of the balancing plate 23 and multiple protrusions 31 that contact the counterweight ball 24. The protrusions 31 are evenly spaced along the same circumference. The retaining ring 25 limits the movement of the balancing plate 23, while the protrusions 31 are fan-shaped or hemispherical, supporting the counterweight ball 24. The counterweight ball 24 keeps the balancing plate 23 level at all times.

[0029] To clean the road surface in front of the detection device, the present invention provides a cleaning mechanism. This cleaning mechanism includes a driving gear 26, a driven gear 27, a sector gear 30, and a cleaning brush 29. The driving gear 26 is fixed to the output shaft below the drive source. The driven gear 27 is rotatably mounted on the bottom plate 1 at the bottom of the frame and meshes with the driving gear 26. The sector gear 30 is rotatably mounted on an adjustment rod 28, which is threadedly engaged with the bottom plate 1 at the bottom of the frame. Rotating the adjustment rod 28 causes the sector gear 30 to move up and down, thereby adjusting the vertical position of the sector gear 30. When the sector gear 30 and the driven gear 27 are at the same height, the sector gear 30 meshes with the driven gear 27. When the sector gear 30 and the driven gear 27 are not at the same height, the meshing state between the sector gear 30 and the driven gear 27 is released. The cleaning brush 29 is fixed to the sector gear 30 and is located outside the circumference of the roller 2. When the sector gear 30 rotates or oscillates, it drives the cleaning brush 29 to rotate or oscillate synchronously. The driving source is a dual-axis motor 20, which is fixed to the base plate 1. The upper output shaft of the dual-axis motor 20 is fixed to the rotating base 21. The leveling motor 12 is fixed inside the rotating base 21. The retaining ring 25 and the protrusion 31 are fixed to the top of the rotating base 21. The lower output shaft of the dual-axis motor 20 is fixedly connected to the driving gear 26. When the lower output shaft of the dual-axis motor 20 rotates, it drives the driving gear 26 to rotate, which in turn drives the driven gear 27 to rotate in the opposite direction. At this time, if the sector gear 30 is meshed with the driven gear 27, the rotation of the driven gear 27 drives the sector gear 30 to rotate, which in turn drives the cleaning brush 29 to rotate. The lower output shaft of the dual-axis motor 20 reciprocates, causing the cleaning brush 29 to oscillate back and forth. The angle of the forward or reverse swing of the cleaning brush 29 is 80-120 degrees. The cleaning brush 29 is an arc-shaped structure. One end of the cleaning brush 29 is fixedly connected to the center of the sector gear 30 . The bottom of the cleaning brush 29 has bristles. The rotation center of the cleaning brush 29 is the center of the sector gear 30 .

[0030] In order to facilitate the movement of the entire detection device, a push rod 7 is fixedly connected to the top plate 4. The user holds the push rod 7 to push the movement of the entire detection device. A tool box 8 is provided on the top of the top plate 4 for storing tools.

[0031] The working principle of the present invention is described below:

[0032] (1) When the detection device is drilling core samples on an inclined or uneven road surface, the laser emitter 19 is started to emit laser light toward the laser tracker 22, and the laser tracker 22 will track and locate the height position of the laser emitter 19 in real time. The driving source drives the rotation of the rotating seat 21, thereby rotating the leveling motor 12. At this time, the driving shaft 13 rotates, and the driving shaft 13 is aligned with each driven shaft 14 in turn during the rotation process. After the driving shaft 13 is aligned with a certain driven shaft 14, the linkage component is started to engage and connect the driving shaft 13 and the driven shaft 14 to achieve linkage. Then the leveling motor 12 is started to drive the rotation of the driving shaft 13, thereby driving the rotation of the driven shaft 14, and then driving the rotation of the leveling shaft 10 through the bevel gear set 11. The leveling shaft 10 drives the lifting sleeve 9 to move up and down, thereby adjusting the height of the base plate 1 corresponding to the lifting sleeve 9, and thus achieving the leveling of the entire detection device. When the laser tracker 22 detects that the lasers emitted by all laser emitters 19 intersect at one point, the leveling is completed. At this time, the core sampling mechanism is used to perform sampling operations to ensure that the core samples taken out are regular, thereby ensuring the accuracy of the structural layer thickness measurement results. (2) The weight of the counterweight ball 24 is concentrated at the center of its bottom. By adopting the above technical solution and utilizing the coordinated arrangement of the balance plate 23 and the counterweight ball 24, even if the bottom plate 1 tilts, the laser tracker 22 can always be kept in a vertical state by gravity, so that its real-time tracking and positioning of the laser emitter 19 is kept at an accurate horizontal reference, thereby ensuring the accuracy of the leveling operation. (3) When in use, first turn the adjustment rod 28 to rotate it downward. At this time, the cleaning brush 29 and the fan gear 30 move downward synchronously. When the fan gear 30 moves downward to engage with the driven gear 27, the driving gear 26 is rotated by the driving source. At this time, the entire detection device is pushed to move, and the rotational motion of the driving gear 26 is transmitted to the sector gear 30 through the driven gear 27, which in turn drives the synchronous swing of the cleaning brush 29, thereby cleaning the stones and other debris on the road surface in front of the detection device to one side, thereby avoiding the detection device from tilting or bumping and affecting the accuracy of the detection.

[0033] The present invention utilizes a laser emitter and a laser tracker to detect the tilt of the detection device in real time. A leveling mechanism drives the lifting and lowering of a lifting sleeve to achieve leveling of the detection device, thereby ensuring the regularity of the core sample removed and, consequently, the accuracy of the structural layer thickness measurement results. A sweeping mechanism is provided, with a sweeping brush that swings to remove debris such as road stones, thereby preventing the detection device from being shaken or tilted by these debris, which could affect detection accuracy.

Claims

1. A device for detecting thickness of a road construction structure layer, comprising a frame with a core drilling and sampling mechanism; characterized in that: It also includes a leveling mechanism and a cleaning mechanism, the leveling mechanism includes a leveling motor, a driving shaft, a linkage assembly, a driven shaft, a lifting sleeve, a leveling shaft, a laser emitter and a laser tracker, the leveling motor is rotatably installed at the lower part of the frame through the driving source, the driving shaft is located at the output end of the leveling motor, the driven shaft is rotatably installed at the lower part of the frame through the support seat, the linkage assembly is located between the driving shaft and the driven shaft to realize the linkage action of the driving shaft and the driven shaft, the lifting sleeve is vertically arranged and the bottom of the lifting sleeve has a roller, the leveling shaft is rotatably connected to the frame and is threaded with the lifting sleeve, and a bevel gear set is provided between the upper end of the leveling shaft and the driven shaft; the laser emitter is located at the top of the support seat, and the laser tracker is located above the leveling motor; the cleaning mechanism includes a driving gear, a driven gear, a fan gear and a cleaning brush, and the driving gear is fixed to the driving source The output end of the driven gear is rotatably mounted on the lower part of the frame and meshes with the driving gear. The sector gear is fixed on the adjusting rod and meshes with the driven gear. The adjusting rod is threadedly engaged with the lower part of the frame. The cleaning brush is fixed on the sector gear and is located outside the circumference of the roller. The laser tracker is mounted on the base plate through a balancing assembly. The balancing assembly includes a balancing plate and a counterweight ball. The balancing plate is fixed to the bottom of the laser tracker. The counterweight ball is fixed to the bottom of the balancing plate. The top of the base plate has a limiting ring located on the periphery of the balancing plate and a protrusion that contacts the counterweight ball. The protrusions are multiple and are located on the same circumference. The driving source is a dual-axis motor. The dual-axis motor is fixed to the base plate. The upper output shaft of the dual-axis motor is fixed with a rotating seat. The leveling motor, the limiting ring and the protrusion are fixed on the rotating seat. The lower output shaft of the dual-axis motor is fixedly connected to the driving gear.

2. The road construction structure layer thickness detection device according to claim 1, characterized in that: The frame comprises a top plate, a support rod and a bottom plate which are sequentially arranged from top to bottom and fixedly connected, and the core sampling mechanism is located on the top plate.

3. The road construction structure layer thickness detection device according to claim 2, characterized in that: The core sampling mechanism includes a drilling drive unit and a metering drill barrel. The drilling drive unit includes a cylinder fixed on the top plate and a drive motor fixed on the cylinder piston rod. The metering drill barrel is located at the output end of the drive motor. The drilling drive unit drives the metering drill barrel to rotate and move up and down. The metering drill barrel is a transparent part with a scale on the outer wall.

4. The device for detecting thickness of a road construction structure layer according to claim 3, characterized in that: The outer periphery of the lifting sleeve is provided with a fixing rod fixedly connected to the bottom plate, and the side wall of the lifting sleeve is provided with a sliding groove connected to the fixing rod for upward and downward sliding.

5. The device for detecting thickness of a road construction structure layer according to claim 4, characterized in that: The linkage assembly includes an electromagnet, a magnetic block and a spring. The electromagnet is fixed to the end of the driving shaft, the first end of the spring is fixedly connected to the end of the driven shaft, and the second end of the spring is fixedly connected to the magnetic block. After the electromagnet and the magnetic block are aligned, the electromagnet is energized. At this time, the electromagnet and the magnetic block are attracted to realize the linkage between the driving shaft and the driven shaft.

6. The device for detecting thickness of a road construction structure layer according to claim 5, characterized in that: A push rod is fixedly connected to the top plate, and a tool box is provided on the top of the top plate.

7. The device for detecting thickness of a road construction structure layer according to claim 6, characterized in that: The cleaning brush is an arc-shaped structure, one end of the cleaning brush is fixedly connected to the sector gear, and the bottom of the cleaning brush is provided with bristles.

8. The device for detecting thickness of a road construction structure layer according to claim 7, characterized in that: The electromagnet and the magnetic block are provided with plug-in structures that are plugged in and matched with each other.

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