Thickness detection device for road construction structure layer

Abstract

A road construction structural layer thickness detection device relates to the technical field of road detection, and solves the problem of inaccurate structural layer thickness detection result caused by pavement inclination. Comprising a rack, a core drilling and sampling mechanism is arranged on the rack, the device further comprises a leveling mechanism and a sweeping mechanism, the leveling mechanism comprises a leveling motor, a driving shaft, a linkage assembly, a driven shaft, a lifting sleeve, a leveling rotating shaft, a laser transmitter and a laser tracker, the driving shaft is located at the output end of the leveling motor, and the linkage assembly is located between the driving shaft and the driven shaft; rollers are arranged at the bottom of the lifting sleeve, the leveling rotating shaft is rotationally connected with the rack and is in threaded fit with the lifting sleeve, and a bevel gear set is arranged between the upper end of the leveling rotating shaft and the driven shaft; the sweeping mechanism comprises a driving gear, a driven gear, a sector gear and a sweeping brush. According to the invention, the leveling of the detection device is realized by arranging the leveling mechanism, so that a core sample taken out is ensured to be regular, and the accuracy of thickness measurement is ensured.

Description

Technical Field

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

[0002] The road construction structural layer includes different structural layers such as subgrade, base course, and surface course. The thickness of the road structural layer is a key factor affecting the bearing capacity, durability, and smoothness of the road surface. After the road is paved, it is necessary to take cores from the road to detect the thickness of its structural layer.

[0003] The detection of the thickness of the road construction structural layer in the prior art has the following defects: First, traditional core drilling equipment mainly relies on manual driving of the core drilling mechanism to drill downward 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, resulting in easy fracture, breakage, or even jamming of the core sample, which not only affects the measurement result 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, and manual sampling is required, and external tools need to be used, making sampling difficult. To overcome the first defect, a device for detecting the thickness of a highway structural layer with the application number 2024219989823 drives the two belt pulleys and the drill barrel to rotate in sequence by starting the motor. At the same time, the horizontal bevel gear drives the vertical bevel gear and the two gears to rotate in sequence, and then drives the support rod, fixed plate, and sliding plate to move downward to achieve downward core drilling. No additional force is required by the worker during the whole process, saving manpower, and the constant rotation speed of the motor makes the downward movement speed of the drill barrel constant, avoiding problems such as fracture, breakage, and jamming of the core sample, and achieving efficient core drilling. To overcome the second defect, an asphalt layer thickness detection device for an asphalt road surface with the application number 2024106273631 judges the thickness of the extracted asphalt layer through the scale engraved on the drill bit in the shape of a transparent cover. It is convenient and fast. After the measurement is completed, the drill bit moves downward, the first limiting rod slides outwards, and the gravity column is prompted to hammer down the asphalt layer extract, and then the asphalt layer sample can be hammered down for sampling.

[0004] Although the above-mentioned prior art overcomes the corresponding defects, it still has the following defects: When the construction road surface is inclined or uneven, it will cause the detection device to tilt, and a skewed core sample will be taken during core drilling, resulting in inaccurate detection results of the structural layer thickness. Moreover, debris such as stones left over from construction on the road surface will also cause the detection device to jolt or tilt, thereby affecting the detection accuracy. Summary of the Invention

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

[0006] To achieve the above object, the present invention provides the following technical solution: a device for detecting the thickness of a road construction structural layer, including a frame, on which a core sampling mechanism is provided; further including a leveling mechanism and a sweeping mechanism. The leveling mechanism includes a leveling motor, a driving shaft, a linkage assembly, a driven shaft, a lifting sleeve, a leveling rotating shaft, a laser emitter and a laser tracker. The leveling motor is rotationally installed at the lower part of the frame through a driving source. The driving shaft is located at the output end of the leveling motor. The driven shaft is rotationally installed at the lower part of the frame through a support seat. The linkage assembly is 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 is vertically arranged and the bottom of the lifting sleeve has rollers. The leveling rotating shaft is rotationally connected with the frame and is in threaded cooperation with the lifting sleeve. There is a bevel gear set between the upper end of the leveling rotating shaft and the driven shaft. The laser emitter is located at the top of the support seat. The laser tracker is located above the leveling motor. The sweeping mechanism includes a driving gear, a driven gear, a sector gear and a cleaning brush. The driving gear is fixed at the output end of the driving source. The driven gear is rotationally installed at 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 in threaded cooperation with the lower part of the frame. The cleaning brush is fixed on the sector gear and is located outside the circumference where the rollers are located.

[0007] Further, the frame includes 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.

[0008] Further, the core sampling mechanism includes a drilling drive unit and a measuring drill barrel. The drilling drive unit includes a cylinder fixed on the top plate and a driving motor fixed on the piston rod of the cylinder. The measuring drill barrel is located at the output end of the driving motor. The drilling drive unit drives the measuring drill barrel to rotate and move up and down at the same time. The measuring drill barrel is a transparent member with scales on its outer wall.

[0009] Further, the periphery of the lifting sleeve has a fixed rod fixedly connected with the bottom plate, and the side wall of the lifting sleeve has a sliding groove slidably connected with the fixed rod up and down.

[0010] Further, 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 with the end of the driven shaft, and the second end of the spring is fixedly connected with 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 of the driving shaft and the driven shaft.

[0011] Further, the laser tracker is mounted on the bottom 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, and the counterweight ball is fixed to the bottom of the balancing plate. The top of the bottom plate has a limiting ring located outside the balancing plate and a protrusion in contact with the counterweight ball. The protrusions are multiple and located on the same circumference.

[0012] Further, the driving source is a biaxial motor. The biaxial motor is fixed on the bottom plate. A rotating seat is fixed to the upper output shaft of the biaxial motor. The leveling motor, the limiting ring, and the protrusion are fixed on the rotating seat. The lower output shaft of the biaxial motor is fixedly connected to a driving gear.

[0013] Further, a push rod is fixedly connected to the top plate, and a tool box is provided at the top of the top plate.

[0014] Further, the cleaning brush is of an arc-shaped structure. One end of the cleaning brush is fixedly connected to a sector gear, and bristles are provided at the bottom of the cleaning brush.

[0015] Further, the electromagnet and the magnetic block are provided with a plug-in structure that is mutually plugged and matched.

[0016] The beneficial effects of the present invention are as follows: By setting the cooperation of the laser emitter and the laser tracker, the inclination degree of the detection device is detected in real time. By setting the leveling mechanism to drive the lifting of the lifting sleeve, the leveling of the detection device is realized, thereby ensuring that the extracted core sample is regular, and then ensuring the accuracy of the measurement result of the structural layer thickness. By setting the cleaning mechanism, the cleaning brush swings to clean sundries such as road stones, thereby avoiding the bumps or inclinations of the detection device caused by road stones and sundries, and further affecting the detection accuracy. Description of the Drawings

[0017] Figure 1 is one of the three-dimensional views of the present invention; Figure 2 is the second three-dimensional view of the present invention; Figure 3 is the three-dimensional view of the frame of the present invention; Figure 4 is the three-dimensional view of the drilling drive unit of the present invention; Figure 5 is the three-dimensional view of the leveling mechanism of the present invention; Figure 6 is the exploded view of the leveling rotating shaft and the lifting sleeve of the present invention; Figure 7 of the present invention Figure 5 partial enlarged view at A; Figure 8 is the three-dimensional view of the cleaning mechanism of the present invention.

[0018] In the figure: 1, bottom plate; 2, roller; 3, support rod; 4, top plate; 5, core drilling drive unit; 6, measuring drill cylinder; 61, drill teeth; 7, push rod; 8, tool box; 9, lifting sleeve; 91, chute; 10, leveling rotating 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 emitter; 20, dual-axis motor; 21, rotating seat; 22, laser tracker; 23, balance plate; 24, counterweight ball; 25, limit ring; 26, driving gear; 27, driven gear; 28, adjusting rod; 29, cleaning brush; 30, sector gear; 31, protrusion; 32, drill cylinder positioning hole; 33, cylinder; 34, driving motor; 35, fixed rod. Detailed implementation mode

[0019] As Figures 1 to 8 shown, the present invention includes a frame, a core sampling mechanism, a leveling mechanism and a cleaning mechanism. The structure and working principle of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] As Figures 1 to 8 shown, the device for detecting the thickness of the road construction structural layer of the present invention includes a frame. The frame includes a top plate 4, a support rod 3 and a bottom plate 1 which are arranged in sequence from top to bottom and fixedly connected. The bottom plate 1 is of a circular structure, the top plate 4 is of a rectangular structure, the top plate 4 and the bottom plate 1 are arranged parallel to each other up and down, and the support rod 3 is located 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. A core sampling mechanism is provided on the frame. Specifically, the core sampling mechanism is located on the top plate 4. The core sampling mechanism includes a core drilling drive unit 5 and a measuring drill cylinder 6. The core drilling drive unit 5 is fixed on the top plate 4. As Figure 4 shown, the core drilling drive unit 5 includes a cylinder 33 and a driving motor 34. The cylinder 33 is fixed on the top plate 4, the driving motor 34 is fixed on the piston rod of the cylinder 33, and the measuring drill cylinder 6 is located at the output end of the driving motor 34. When the piston rod of the cylinder 33 expands and contracts, it drives the driving motor 34 and the measuring drill cylinder 6 to move up and down. After the driving motor 34 is started, it drives the measuring drill cylinder 6 to rotate. Furthermore, the core drilling drive unit 5 drives the measuring drill cylinder 6 to rotate while moving up and down, thereby realizing the core sampling of the road construction structural layer. The measuring drill cylinder 6 is a transparent member with scales on the outer wall. The end of the drilling end of the measuring drill cylinder 6 is provided with drill teeth 61. The arrangement of the drill teeth 61 facilitates breaking through the road and extending into the structural layer. A circular drill cylinder positioning hole 32 is provided on the bottom plate 1. The measuring drill cylinder 6 extends into the drill cylinder positioning hole 32, and the outer wall of the measuring drill cylinder 6 contacts the inner wall of the drill cylinder positioning hole 32. The arrangement of the drill cylinder positioning hole 32 plays a guiding role in the movement of the measuring drill cylinder 6.

[0021] To detect the inclination of the entire detection device and to level it in a timely manner after the detection device is inclined, the present invention is provided with a leveling mechanism. As Figure 5 , Figure 6 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 rotating 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 drive 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 seat 18. As Figure 3 shown, three support seats 18 are fixedly mounted on the bottom plate 1 and are evenly arranged in the circumferential direction. As Figure 1 shown, a driven shaft 14 is rotatably mounted on each support seat 18. The linkage assembly is located between the drive shaft 13 and the driven shaft 14 to realize the linkage action between the drive shaft 13 and the driven shaft 14.

[0022] The linkage assembly includes an electromagnet 15, a magnetic block 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 magnetic block 17. The spring 16, the magnetic block 17, and the driven shaft 14 are coaxially arranged. Since the leveling motor 12 is rotatably connected to the bottom plate 1, during the rotation of the leveling motor 12, the drive shaft 13 and the electromagnet 15 rotate accordingly. After the electromagnet 15 and the magnetic block 17 are aligned during the rotation, the electromagnet 15 is energized. At this time, the electromagnet 15 and the magnetic block 17 are attracted to each other to realize the linkage between the drive shaft 13 and the driven shaft 14, and at this time 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 are provided with a plug-in structure that is inserted and matched with each other. The plug-in structure includes a plug at the end of the electromagnet 15 and a jack at the end of the magnetic block 17. The end of the plug is provided with a chamfer or the plug is conical to facilitate the smooth insertion of the plug into the jack. 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 rotating shaft 10 is rotatably connected to the bottom plate 1 of the frame, and the lower end of the leveling rotating shaft 10 is in threaded cooperation with the lifting sleeve 9. There is a bevel gear set 11 between the upper end of the leveling rotating shaft 10 and the driven shaft 14. The bevel gear set 11 includes a driving bevel gear fixed to the end of the driven shaft 14 and a driven bevel gear fixed to the upper end of the leveling rotating shaft 10. When the driven shaft 14 rotates, the driving bevel gear rotates accordingly, thereby driving the driven bevel gear to rotate, thereby driving the rotation of the leveling rotating shaft 10, and thereby driving the up and down movement of the lifting sleeve 9. 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 bottom plate 1, and the side wall of the lifting sleeve 9 has a chute 91 that slidably connects with the fixed rod 35 up and down. When the lifting sleeve 9 moves up and down, it slides along the fixed rod 35.

[0023] As shown Figure 5 in the figure, the laser emitter 19 is located at the top of the support base 18, and the laser tracker 22 is located above the leveling motor 12. The laser tracker 22 is mounted on the bottom plate 1 through a balancing assembly. As shown Figure 5 、 Figure 7 in the figure, 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, and the counterweight ball 24 is fixed to the bottom of the balancing plate 23. The top of the bottom plate 1 has a limiting ring 25 located outside the periphery of the balancing plate 23 and a protrusion 31 in contact with the counterweight ball 24. The protrusions 31 are multiple and evenly arranged on the same circumference. The limiting ring 25 limits the movement of the balancing plate 23. The protrusions 31 are fan-shaped or hemispherical, and the protrusions 31 support the counterweight ball 24. Under the action of the counterweight ball 24, the balancing plate 23 always remains horizontal.

[0024] To realize the cleaning of the stones on the road surface in front of the detection device, the present invention is provided with a sweeping mechanism. The sweeping 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 under the driving source. The driven gear 27 is rotatably mounted on the bottom plate 1 at the lower part of the frame, and the driven gear 27 meshes with the driving gear 26. The sector gear 30 is rotatably mounted on the adjusting rod 28. The adjusting rod 28 is in threaded cooperation with the bottom plate 1 at the lower part of the frame. When the adjusting rod 28 is rotated, the sector gear 30 moves up and down accordingly, thereby adjusting the vertical height position of the sector gear 30. When the sector gear 30 is at the same height as the driven gear 27, the sector gear 30 can be meshed with the driven gear 27. When the sector gear 30 is not at the same height as the driven gear 27, 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 where the roller 2 is located. When the sector gear 30 rotates or swings, it drives the synchronous rotation or swing of the cleaning brush 29. The driving source is a double-shaft motor 20. The double-shaft motor 20 is fixed to the bottom plate 1. The upper output shaft of the double-shaft motor 20 is fixed with a rotating seat 21. The leveling motor 12 is fixed inside the rotating seat 21. The limiting ring 25 and the protrusion 31 are fixed to the top of the rotating seat 21. The lower output shaft of the double-shaft motor 20 is fixedly connected to the driving gear 26. When the lower output shaft of the double-shaft motor 20 rotates, it drives the rotation of the driving gear 26, and then drives the reverse rotation of the driven gear 27. At this time, if the sector gear 30 meshes with the driven gear 27, the rotation of the driven gear 27 drives the rotation of the sector gear 30, and then drives the rotation of the cleaning brush 29. The lower output shaft of the double-shaft motor 20 is in a reciprocating motion mode, so that the cleaning brush 29 is in a reciprocating swing motion mode. The forward or reverse swing angle of the cleaning brush 29 is 80-120 degrees. The cleaning brush 29 is of 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.

[0025] For the convenience of moving the entire detection device, a push rod 7 is fixedly connected to the top plate 4, and the user holds the push rod 7 to push the entire detection device to move. A tool box 8 is provided at the top of the top plate 4 for storage function to facilitate placing tools.

[0026] The working principle of the present invention will be described below: (1) When the detection device performs core sampling on an inclined or uneven road surface, start the laser emitter 19 to emit laser towards the laser tracker 22, and the laser tracker 22 will track and locate the height position of the laser emitter 19 in real time. Drive the rotation of the rotating base 21 through the drive source, and then make the leveling motor 12 rotate. At this time, the drive shaft 13 rotates, and the drive shaft 13 aligns with each driven shaft 14 in turn during the rotation process. When the drive shaft 13 aligns with a certain driven shaft 14, start the linkage component to suck and dock the drive shaft 13 and the driven shaft 14 to achieve linkage. Then start the leveling motor 12 to drive the rotation of the drive shaft 13, and then drive the rotation of the driven shaft 14. Then drive the rotation of the leveling rotating shaft 10 through the bevel gear set 11, and the leveling rotating shaft 10 drives the lifting and lowering movement of the lifting sleeve 9, so as to adjust the height of the bottom plate 1 corresponding to the lifting sleeve 9, and then achieve the leveling of the entire detection device. When the laser tracker 22 detects that the lasers emitted by all the laser emitters 19 intersect at a point, the leveling is completed. At this time, use the core sampling mechanism to perform the sampling operation, which can ensure that the extracted core samples are regular, and then ensure the accuracy of the structural layer thickness measurement result. (2) The weight of the counterweight ball 24 is concentrated at the center of its bottom. By adopting the above technical solution, with the cooperation of the balance plate 23 and the counterweight ball 24, even if the bottom plate 1 is inclined, the laser tracker 22 can always remain in the vertical state under the action of gravity, so that its real-time tracking and positioning of the laser emitter 19 can be maintained on an accurate horizontal reference, and then ensure the accuracy of the leveling operation. (3) When in use, first rotate the adjusting rod 28 to make it rotate and move downward. At this time, the cleaning brush 29 and the sector gear 30 move downward synchronously. When the sector gear 30 moves downward to mesh with the driven gear 27, make the driving gear 26 rotate through the drive source. At this time, push the entire detection device to move. The rotational movement of the driving gear 26 is transmitted to the sector gear 30 through the driven gear 27, and then drives the synchronous swing of the cleaning brush 29, and then sweeps the stones and other sundries on the road surface in front of the detection device to one side, so as to avoid affecting the detection accuracy due to the inclination or bump of the detection device.

[0027] Through the cooperation of a laser emitter and a laser tracker, the present invention can detect the inclination degree of the detection device in real time. By setting up a leveling mechanism to drive the lifting of the lifting sleeve, the leveling of the detection device is achieved, thereby ensuring that the extracted core samples are regular and then ensuring the accuracy of the measurement results of the structural layer thickness. By setting up a sweeping mechanism, the cleaning brush swings to clean sundries such as road stones, thus avoiding the bumps or inclinations of the detection device caused by road stones and sundries, and further affecting the detection accuracy.

Claims

1. Road construction structural layer thickness detection device, including a frame, and a core drilling and sampling mechanism is provided on the frame; characterized in that, It also includes a leveling mechanism and a sweeping mechanism. The leveling mechanism includes a leveling motor, a driving shaft, a linkage assembly, a driven shaft, a lifting sleeve, a leveling rotating shaft, a laser emitter, and a laser tracker. The leveling motor is rotatably installed at the lower part of the frame through a 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 a support seat. The linkage assembly is located between the driving shaft and the driven shaft and is used to realize the linkage action of the driving shaft and the driven shaft. The lifting sleeve is arranged vertically and has rollers at the bottom. The leveling rotating shaft is rotatably connected to the frame and is in threaded cooperation with the lifting sleeve. There is a bevel gear set between the upper end of the leveling rotating shaft and the driven shaft. The laser emitter is located at the top of the support seat. The laser tracker is located above the leveling motor. The sweeping mechanism includes 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 installed at the lower part of the frame and meshes with the driving gear. The sector gear is fixed to the adjusting rod and meshes with the driven gear. The adjusting rod is in threaded cooperation with the lower part of the frame. The cleaning brush is fixed to the sector gear and is located outside the circumference where the rollers are located.

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

3. The road construction structural layer thickness detection device according to claim 2, characterized in that, The core sampling mechanism includes a drilling driving unit and a measuring drill cylinder. The drilling driving unit includes a cylinder fixed to the top plate and a driving motor fixed to the piston rod of the cylinder. The measuring drill cylinder is located at the output end of the driving motor. The drilling driving unit drives the measuring drill cylinder to rotate and move up and down at the same time. The measuring drill cylinder is a transparent part with scales on its outer wall.

4. The road construction structural layer thickness detection device according to claim 3, characterized in that, There is a fixed rod fixedly connected to the bottom plate around the lifting sleeve. The side wall of the lifting sleeve has a sliding groove that slidably connects with the fixed rod up and down.

5. The road construction structural layer thickness detection device 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. 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 each other to realize the linkage of the driving shaft and the driven shaft.

6. The thickness detection device for the road construction structural layer according to claim 5, characterized in that, The laser tracker is installed on the bottom 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. There is a limiting ring located outside the balancing plate on the top of the bottom plate and a protrusion in contact with the counterweight ball. The protrusions are multiple and located on the same circumference.

7. The road construction structural layer thickness detection device according to claim 6, wherein The driving source is a double-shaft motor. The double-shaft motor is fixed to the bottom plate. A rotating seat is fixed to the upper output shaft of the double-shaft motor. The leveling motor, the limiting ring, and the protrusion are fixed to the rotating seat. The lower output shaft of the double-shaft motor is fixedly connected to the driving gear.

8. The road construction structural layer thickness detection device according to claim 7, characterized in that, A push rod is fixedly connected to the top plate. There is a tool box on the top of the top plate.

9. The road construction structural layer thickness detection device according to claim 8, characterized in that, The cleaning brush is in an arc structure. One end of the cleaning brush is fixedly connected to the sector gear. The bottom of the cleaning brush has bristles.

10. The road construction structural layer thickness detection device according to claim 9, characterized in that, The electromagnet and the magnetic block have an insertion structure that is inserted and matched with each other.

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