Asphalt concrete paving flatness detection device
By designing a combination of an eight-wheeled vehicle frame, a sweeping mechanism, and an air jet assembly, the problem of sand and dust affecting the accuracy of test data was solved, enabling high-precision asphalt pavement smoothness testing in sandy environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- THE QINGDAO ENG CO LTD OF CHINA RAILWAY NO 10 ENG GRP CO LTD
- Filing Date
- 2025-12-02
- Publication Date
- 2026-05-08
AI Technical Summary
When conducting long-distance asphalt pavement smoothness tests in areas with heavy dust, dust can easily adhere to the surface of the test wheel, causing unevenness on the outer circumference of the measuring wheel and affecting the accuracy of the test data.
An asphalt concrete paving smoothness testing device was designed, including an eight-wheeled frame, a sweeping mechanism, a stabilizing mechanism, and an air jet assembly. The air jet assembly sprays high-pressure gas to sweep away sand and dust on the road surface, the support assembly stabilizes the sliding sleeve, and the buffer assembly reduces vibration, ensuring that the test wheel is in close contact with the road surface and rotates on its own, thereby collecting road surface smoothness data.
It effectively prevents sand and dust from adhering to the surface of the test wheel, reduces false displacement signals, ensures the accuracy of test data, reduces the impact of frame vibration, and improves test accuracy.
Smart Images
Figure CN121992702A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of asphalt pavement construction equipment technology, specifically to an asphalt concrete paving smoothness testing device. Background Technology
[0002] Road surface smoothness is the deviation of longitudinal unevenness of the road surface. It is an important indicator for evaluating the performance of the road surface and directly affects the driving quality of vehicles on the road and the basic functions of highways. Road surface unevenness is an important factor causing random vibration of vehicles, which not only increases tire wear and fuel consumption, but also causes premature damage to the road surface due to impact in severe cases. Testing devices are usually used to confirm the smoothness of the road surface. The testing methods are divided into: contact mechanical measurement, non-contact sensor measurement, and integrated marking detection, etc.
[0003] When conducting long-distance smoothness tests on asphalt-paved highways, an eight-wheel smoothness tester is often used. To ensure the accuracy of the test, the test section is usually cleaned. However, in areas with heavy dust, the dust may accumulate quickly on the cleaned road surface. During long-distance testing, the surface of the test wheel may be covered with a lot of dust, which may cause the outer circle of the measuring wheel to be uneven. This can lead to irregular rotation of the measuring wheel, misjudging road surface undulations, and affecting the accuracy of the test data. Summary of the Invention
[0004] To solve the above technical problems, the present invention provides an asphalt concrete paving smoothness testing device, including an eight-wheeled vehicle frame, a fixed sleeve fixedly connected to the bottom of the eight-wheeled vehicle frame, a sliding sleeve provided at the bottom of the eight-wheeled vehicle frame, the outer wall of the sliding sleeve being slidably connected to the inner wall of the fixed sleeve, a sliding support frame being slidably connected to the inner wall of the sliding sleeve, and a rubber sealing ring being fixedly connected to the outer wall of the sliding sleeve to prevent gas leakage. A test wheel is rotatably connected to the inner wall of the sliding support frame 1, a linear displacement sensor is fixedly connected to the inner wall of the sliding sleeve, the bottom of the output end of the linear displacement sensor is fixedly connected to the top of the sliding support frame 1, and a counterweight is fixedly connected to the outer wall of the sliding support frame 1. The main structure is fixedly mounted at the bottom of the eight-wheeled frame, providing a support point; The sweeping mechanism is fixedly installed at the bottom of the eight-wheeled vehicle frame and is used to sweep the road surface; A stabilizing mechanism is rotatably mounted on the inner wall of the sliding sleeve to support it. When using this system for long-distance asphalt pavement testing, the operator connects the eight-wheeled vehicle frame to the tractor, bringing the frame into contact with the road surface. The test wheels then contact the road surface, and the weight of the counterweight ensures close contact. After calibration, the tractor is started, propelling the eight-wheeled vehicle frame across the road. During this movement, the test wheels rotate due to friction with the road surface. As the test wheels move, road undulations cause them to rise or fall, which in turn raises or lowers the sliding support frame, pushing the output of the linear displacement sensor to rise or fall, thus collecting data on the pavement's smoothness.
[0005] Preferably, the main structure includes: Telescopic assembly, which is fixedly installed at the bottom of the eight-wheeled vehicle frame; A rotating component is rotatably mounted on the inner wall of the telescopic component; The rotating component slides inside the telescopic component, causing it to contact the ground. As the eight-wheeled frame moves, the rotating component rotates due to friction with the ground.
[0006] Preferably, the cleaning mechanism includes: The jet assembly is fixedly mounted on the bottom of the eight-wheeled frame by fasteners; The fasteners include a pneumatic frame that is fixedly connected to the bottom of the eight-wheeled vehicle frame. A piston plate is slidably connected to the inner wall of the pneumatic frame, and a rubber strip is fixedly connected to the outer wall of the piston plate for fully compressing the gas. The cleaning component is fixedly installed on the inner wall of the jet component; Among them, the jetting component sprays gas onto the road surface to sweep away the sand and dust, and the sweeping component cleans the sand and dust from the surface of the rotating component.
[0007] Preferably, the stabilizing mechanism includes: A buffer assembly is fixedly installed at the bottom of the pneumatic frame via a connector; The connector includes a pneumatic sleeve fixedly connected to the bottom of the pneumatic frame, a piston rod slidably connected to the inner wall of the pneumatic sleeve, and a rubber sealing ring II fixedly connected to the outer wall of the piston rod for fully compressing the gas. A support assembly is rotatably mounted on the inner wall of the sliding sleeve via a rotating component; The rotating component includes a rotating disk rotatably connected to the inner wall of the sliding sleeve, and a stop block is fixedly connected to the top of the sliding sleeve; Among them, the vibration transmitted from the eight-wheel frame to the test wheel is reduced by the buffer component, and the sliding sleeve is supported by the support component to keep the sliding sleeve stable.
[0008] Preferably, the telescopic component includes a connecting sleeve fixedly connected to the bottom of the eight-wheeled vehicle frame, and a sliding support frame two is provided at the bottom of the eight-wheeled vehicle frame, with the inner wall of the connecting sleeve slidably connected to the outer wall of the sliding support frame two. The rotating assembly includes a rotating wheel located at the bottom of the eight-wheeled frame. The outer wall of the rotating wheel is rotatably connected to the inner wall of the sliding support frame 2. A protruding ring is fixedly connected to the side wall of the rotating wheel. When the eight-wheeled vehicle frame is in contact with the ground, the rotating wheel will also be in contact with the road surface. The movement of the eight-wheeled vehicle frame will drive the rotating wheel to move. The rotating wheel will rotate due to the friction between it and the road surface, which will drive the convex ring to rotate.
[0009] Preferably, the jet assembly includes a spring frame fixedly connected to the side wall of the piston plate, the side of the spring frame away from the piston plate being slidably connected to the side wall of the convex ring, and a jet pipe being connected through the inner wall of the air pressure frame. A plugging rod is slidably connected to the inner wall of the jet pipe, and a connecting rod is rotatably connected to the side of the piston plate away from the spring frame. The inner wall of the connecting rod is rotatably connected to the top of the plugging rod. When the convex ring rotates, when the protruding part of the convex ring contacts the spring frame, it will push the spring frame to move towards the sliding sleeve, so that it accumulates rebound force and drives the piston plate to move. When the piston plate moves and covers the flow groove, the right side of the piston plate is in a closed state. As the piston plate continues to move, it will squeeze the gas in the air pressure frame. The squeezed high-pressure gas will be blocked by the blocking rod, so the gas pressure will continue to rise. When the piston plate moves, it will also push the connecting rod to rotate, changing the angle between the connecting rod and the piston plate, thereby pulling the blocking rod up until the blocking rod separates from the jet pipe. The high-pressure gas will then enter the jet pipe and spray out towards the road surface in front of the test wheel to clean the road surface. During the continuous rotation of the convex ring, when the spring frame separates from the protruding position of the convex ring, the rebound force of the spring frame is released, causing the piston plate to return to its original position. After the piston plate returns to its original position, the flow groove will reconnect with the left side of the piston plate, and external gas will enter the air pressure frame to replenish the gas until the convex ring squeezes the spring frame again, causing high-pressure gas to be continuously ejected from the jet pipe. This cleans the movement path of the test wheel on the road surface in real time, reduces the sand and dust in contact with the surface of the test wheel, and effectively prevents the test wheel from having too much sand and dust adhering to its surface, which would reduce its roundness. During the rotation of the test wheel, periodic false displacement signals will be generated, thereby ensuring the accuracy of the test data.
[0010] Preferably, the cleaning assembly includes a diverter pipe that runs through the inner wall of the jet pipe, and a scraper plate is fixedly connected to the bottom of the spring frame; As the spring frame reciprocates, it also drives the scraper plate to move, repeatedly scraping the sand and dust on the surface of the rotating wheel, reducing the amount of sand and dust on the rotating wheel surface. At the same time, some of the high-pressure gas entering the jet pipe will be diverted into the diversion pipe and continuously sprayed in front of the rotating wheel, reducing the amount of sand and dust in that path and effectively preventing the rotating wheel from contacting too much sand and dust. Sand and dust are relatively smooth, which will reduce the friction between the rotating wheel and the road surface and affect the smooth rotation of the rotating wheel.
[0011] Preferably, the buffer assembly includes a connecting pipe that extends through the inner wall of the pneumatic sleeve, the outer wall of the connecting pipe being connected through to the inner wall of the fixed sleeve, and the side wall of the piston rod being fixedly connected to the side of the spring frame near the piston plate. A spring ball head rod is slidably connected to the inner wall of the connecting pipe, and a throttling hole is opened on the inner wall of the fixed sleeve; When the spring frame moves toward the sliding sleeve, it will also drive the piston rod to move. After the piston rod moves and covers the flow hole, it will squeeze the gas in the pneumatic sleeve. The gas will enter the connecting pipe and be blocked by the spring ball head rod, which will increase the gas pressure until the gas in the connecting pipe pushes the spring ball head rod to move and separate from the inclined surface of the connecting pipe, so that it accumulates the rebound force and the gas will enter the fixed sleeve. When the spring frame returns to its original position, it will drive the piston rod to return to its original position. At this time, the squeezing force on the spring ball rod disappears, and the spring force of the spring ball rod will be released, allowing the spring ball rod to fit against the inclined surface of the connecting tube, blocking the backflow of gas in the fixed sleeve. After the piston rod returns to its original position, it will allow the flow hole to connect with the right side of the piston rod again, allowing external gas to enter the pneumatic sleeve until the spring frame drives the piston rod to move towards the sliding sleeve again, squeezing the gas into the fixed sleeve again. This process is repeated to continuously inject high-pressure gas into the fixed sleeve. The gas inside the fixed sleeve will slowly flow out through the throttling orifice. When the eight-wheel frame vibrates during travel, the sliding support frame supports the sliding sleeve through the support assembly, keeping the sliding sleeve stable. When the eight-wheel frame vibrates, it will squeeze the gas inside the fixed sleeve and flow out through the throttling orifice. Because the throttling orifice is small, it will increase the flow resistance of the gas, reduce the vibration force of the eight-wheel frame, and attenuate the vibration amplitude of the eight-wheel frame. This effectively prevents the eight-wheel frame from vibrating due to uneven distribution of sand and dust on the road surface when traveling. The vibration will be transmitted to the test wheel, causing the test wheel to bounce and increasing the detection error.
[0012] Preferably, the support assembly includes a universal ball joint rotatably connected to the bottom of the rotating disk, a spring plate fixedly connected to the top of the sliding sleeve, and the side wall of the spring plate being fixedly connected to the side wall of the rotating disk by a spring. A connecting block is fixedly connected to the side wall of the air pressure frame, and a sliding block is slidably connected to the inner wall of the connecting block. The bottom of the universal ball rod is rotatably connected to the inner wall of the connecting block.
[0013] Preferably, the support assembly further includes a fixed plate fixedly connected to the two side walls of the sliding support frame, an arc-shaped push block fixedly connected to the top of the fixed plate, and the inner wall of the fixed plate slidably connected to the outer wall of the sliding block; When high-pressure gas is injected into the fixed sleeve, the high-pressure gas will exert a compressive force on the sliding sleeve, causing the sliding sleeve to descend. The sliding sleeve will drive the rotating disk to descend, and the distance between the rotating disk and the fixed disk will shorten, which will push the universal ball rod to rotate. At the same time, the universal ball rod will rotate around the center of the rotating disk, forcing the rotating disk to rotate. However, the universal ball joint has an arc-shaped rod, and the convex direction of the arc surface is far away from the center of the rotating disk. When the rotating disk descends, it will generate an outward bending moment on the arc-shaped rod of the universal ball joint. The arc-shaped rod of the universal ball joint will generate a restoring torque to maintain the outward convex shape, pushing the rotating disk to rotate counterclockwise. However, when the rotating disk rotates counterclockwise, it will be blocked by the stop block, so the rotating disk cannot rotate, and the sliding sleeve cannot descend, thus providing stable support for the sliding sleeve.
[0014] The present invention has the following beneficial effects: When using this invention for long-distance testing of asphalt pavements, the operator connects an eight-wheeled vehicle frame to a tractor. When the eight-wheeled vehicle frame contacts the ground, the rotating wheel also contacts the pavement. The movement of the eight-wheeled vehicle frame causes the rotating wheel to rotate, which in turn rotates the convex ring. The protruding part of the convex ring squeezes the jet assembly, causing it to compress gas and generate high pressure. This gas is then sprayed through the jet pipe onto the pavement in front of the test wheel, cleaning the pavement. As the convex ring continues to rotate, the jet assembly continuously compresses the gas, causing high-pressure gas to continuously spray from the jet pipe, constantly cleaning the test wheel's path on the pavement. This reduces dust contact with the test wheel surface, effectively preventing excessive dust accumulation that could reduce its roundness. The rotation of the test wheel also generates periodic false displacement signals, ensuring the accuracy of the test data.
[0015] (2) When the spring frame moves toward the sliding sleeve, it will also drive the piston rod to move. After the piston rod moves and covers the flow hole, it will squeeze the gas in the air pressure sleeve and enter the fixed sleeve. When the spring frame moves back and forth, it will make the piston rod continuously squeeze the gas and enter the fixed sleeve, so that the gas in the fixed sleeve will generate high pressure. The gas in the fixed sleeve will slowly flow out through the throttling hole. When the eight-wheel frame vibrates during driving, the sliding support frame supports the sliding sleeve through the support component, so that the sliding sleeve remains stable. When the eight-wheel frame vibrates, it will squeeze the gas in the fixed sleeve and flow out through the throttling hole. Since the throttling hole is small, it will increase the flow resistance of the gas and reduce the vibration force of the eight-wheel frame. It effectively prevents the uneven distribution of sand and dust on the road surface from increasing the vibration of the eight-wheel frame when the eight-wheel frame is driving on the road. The vibration will be transmitted to the test wheel, causing the test wheel to jump and increasing the detection error.
[0016] (3) When high-pressure gas is injected into the fixed sleeve, the high-pressure gas will exert a squeezing force on the sliding sleeve, causing the sliding sleeve to descend. The sliding sleeve will drive the rotating disk to descend. However, the universal ball rod has an arc-shaped rod. When the rotating disk descends, it will generate an outward bending moment on the arc-shaped rod of the universal ball rod, causing the rotating disk to rotate counterclockwise. It is blocked by the stop block, so the sliding sleeve cannot descend. When the rotating wheel contacts a relatively protruding area of the road surface, it will cause the rotating wheel to rise, driving the fixed disk and the arc-shaped push block to rise, and pushing the universal ball rod to rise. Through the support component, the universal ball rod will push the rotating disk to rotate clockwise, effectively preventing the test wheel from contacting the road surface with large undulations. When the test wheel drives the output end of the linear displacement sensor to rise, the rotating wheel rises synchronously, which will drive the sliding sleeve and the linear displacement sensor to rise, so that the linear displacement sensor is in a relatively static state. The output end of the linear displacement sensor does not show obvious movement, making it difficult to accurately reflect the rise of the test wheel.
[0017] (4) When the spring frame moves back and forth, it will also drive the scraping plate to move, scraping the sand and dust on the surface of the rotating wheel, reducing the sand and dust on the surface of the rotating wheel. At the same time, some of the high-pressure gas entering the jet pipe will be diverted into the diversion pipe and continuously sprayed in front of the rotating wheel, reducing the sand and dust in that path and effectively preventing the rotating wheel from contacting too much sand and dust. The sand and dust are relatively smooth, which will reduce the friction between the rotating wheel and the road surface and affect the smooth rotation of the rotating wheel. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 This is a cross-sectional view of the connecting sleeve of the present invention; Figure 4 This is a cross-sectional schematic diagram of the pneumatic frame of the present invention; Figure 5 This is a schematic diagram of the spring frame of the present invention from the left. Figure 6 This is a schematic cross-sectional view of the sliding support frame of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle; Figure 8This is a schematic cross-sectional view of the sliding sleeve of the present invention from the right side. Figure 9 This is a partially enlarged schematic diagram of the connecting tube of the present invention; Figure 10 This is a cross-sectional view of the rotating disk of the present invention; Figure 11 For the present invention Figure 10 Enlarged view of point C in the middle; Figure 12 This is a top view of the rotating disk of the present invention; Figure 13 This is a schematic diagram of the working process of the universal ball joint of the present invention; Figure 14 This is a top view of the fixed disk of the present invention.
[0020] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Main body; 11. Telescopic assembly; 12. Rotating assembly; 13. Eight-wheel frame; 14. Fixed sleeve; 15. Sliding sleeve; 16. Sliding support frame one; 17. Test wheel; 18. Linear displacement sensor; 19. Counterweight; 111. Connecting sleeve; 112. Sliding support frame two; 121. Rotating wheel; 122. Convex ring; 2. Sweeping mechanism; 21. Air jet assembly; 22. Sweeping assembly; 211. Air pressure frame; 212. Piston plate; 213. Spring frame; 214. 1. Jet pipe; 215. Blocking rod; 216. Connecting rod; 221. Diverter pipe; 222. Scraper plate; 3. Stabilizing mechanism; 31. Buffer assembly; 32. Support assembly; 311. Pneumatic sleeve; 312. Piston rod; 313. Connecting pipe; 314. Spring ball joint rod; 315. Throttling orifice; 321. Rotating disk; 322. Fixed disk; 323. Connecting block; 324. Universal ball joint; 325. Sliding block; 326. Arc-shaped push block; 327. Stop block; 328. Spring plate. Detailed Implementation
[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0022] Example 1, please refer to Figures 1-7The present invention is an asphalt concrete paving smoothness testing device, including an eight-wheeled vehicle frame 13, a fixed sleeve 14 fixedly connected to the bottom of the eight-wheeled vehicle frame 13, a sliding sleeve 15 provided at the bottom of the eight-wheeled vehicle frame 13, the outer wall of the sliding sleeve 15 being slidably connected to the inner wall of the fixed sleeve 14, a sliding support frame 16 being slidably connected to the inner wall of the sliding sleeve 15, and a rubber sealing ring 1 fixedly connected to the outer wall of the sliding sleeve 15 to prevent gas leakage. A test wheel 17 is rotatably connected to the inner wall of the sliding support frame 16, and a linear displacement sensor 18 is fixedly connected to the inner wall of the sliding sleeve 15. The bottom of the output end of the linear displacement sensor 18 is fixedly connected to the top of the sliding support frame 16, and a counterweight 19 is fixedly connected to the outer wall of the sliding support frame 16. The specific model of the linear displacement sensor 18 is: LVDT-A2-50. Main body 1 is fixedly installed at the bottom of the eight-wheeled frame 13 to provide a support point; Sweeping mechanism 2 is fixedly installed at the bottom of the eight-wheeled vehicle frame 13 and is used to sweep the road surface; The stabilizing mechanism 3 is rotatably disposed on the inner wall of the sliding sleeve 15 to support the sliding sleeve 15. When long-distance testing of asphalt pavement is required, the operator connects the eight-wheeled vehicle frame 13 to the tractor, making the frame 13 contact the road surface. The test wheel 17 then contacts the road surface, and the weight of the counterweight 19 ensures close contact between the test wheel 17 and the road surface. After calibration, the tractor is started to drive the eight-wheeled vehicle frame 13 on the road surface. During the journey, the test wheel 17 rotates due to friction with the road surface. As the test wheel 17 moves along the road surface, the undulations of the road surface cause it to rise or fall, thereby causing the sliding support frame 16 to rise or fall, which in turn pushes the output end of the linear displacement sensor 18 to rise or fall, thus collecting the road surface smoothness data.
[0023] Main body 1 includes: Telescopic assembly 11 is fixedly installed at the bottom of the eight-wheeled vehicle frame 13; Rotating component 12 is rotatably disposed on the inner wall of telescopic component 11; The rotating component 12 slides inside the telescopic component 11, causing it to contact the ground. When the eight-wheeled frame 13 moves, the rotating component 12 will rotate due to the friction with the ground.
[0024] Cleaning mechanism 2 includes: Jet assembly 21 is fixedly mounted on the bottom of the eight-wheeled frame 13 by fasteners; The fasteners include a pneumatic frame 211 fixedly connected to the bottom of the eight-wheeled vehicle frame 13, a piston plate 212 slidably connected to the inner wall of the pneumatic frame 211, and a rubber strip fixedly connected to the outer wall of the piston plate 212 for fully compressing the gas. Cleaning component 22 is fixedly installed on the inner wall of jet component 21; Among them, the jet assembly 21 sprays gas onto the road surface to sweep away the sand and dust, and the sweeping assembly 22 cleans the sand and dust on the surface of the rotating assembly 12.
[0025] Stabilizing agency 3 includes: The buffer assembly 31 is fixedly installed at the bottom of the air pressure frame 211 via a connector; The connector includes a pneumatic sleeve 311 fixedly connected to the bottom of the pneumatic frame 211, a piston rod 312 slidably connected to the inner wall of the pneumatic sleeve 311, and a rubber sealing ring 2 fixedly connected to the outer wall of the piston rod 312 for fully compressing the gas. Support component 32 is rotatably mounted on the inner wall of sliding sleeve 15 via a rotating component; The rotating component includes a rotating disk 321 rotatably connected to the inner wall of the sliding sleeve 15, and a stop block 327 is fixedly connected to the top of the sliding sleeve 15. The buffer assembly 31 reduces the vibration transmitted from the eight-wheel frame 13 to the test wheel 17, and the support assembly 32 supports the sliding sleeve 15 to keep it stable.
[0026] Example 2, please refer to Figures 2-14 The present invention is an asphalt concrete paving smoothness testing device. Based on Example 1, the telescopic component 11 includes a connecting sleeve 111 fixedly connected to the bottom of the eight-wheeled vehicle frame 13. The bottom of the eight-wheeled vehicle frame 13 is provided with a sliding support frame 2 112. The inner wall of the connecting sleeve 111 is slidably connected to the outer wall of the sliding support frame 2 112. The rotating assembly 12 includes a rotating wheel 121 disposed at the bottom of the eight-wheeled frame 13. The outer wall of the rotating wheel 121 is rotatably connected to the inner wall of the sliding support frame 112. A protruding ring 122 is fixedly connected to the side wall of the rotating wheel 121. When the eight-wheeled vehicle frame 13 is in contact with the ground, the rotating wheel 121 will also be in contact with the road surface. The movement of the eight-wheeled vehicle frame 13 will drive the rotating wheel 121 to move. The rotating wheel 121 will rotate due to the friction between it and the road surface, which will drive the convex ring 122 to rotate.
[0027] The jet assembly 21 includes a spring frame 213 fixedly connected to the side wall of the piston plate 212. The side of the spring frame 213 away from the piston plate 212 is slidably connected to the side wall of the convex ring 122. A jet pipe 214 is connected through the inner wall of the pneumatic frame 211. A blocking rod 215 is slidably connected to the inner wall of the jet pipe 214, and a connecting rod 216 is rotatably connected to the side of the piston plate 212 away from the spring frame 213. The inner wall of the connecting rod 216 is rotatably connected to the top of the blocking rod 215. When the convex ring 122 rotates, when the protruding part of the convex ring 122 contacts the spring frame 213, it will push the spring frame 213 to move towards the sliding sleeve 15, causing it to accumulate rebound force, which will drive the piston plate 212 to move. When the piston plate 212 moves to cover the flow groove, such as Figure 4 As shown in position G, the right side of piston plate 212 is closed at this time. As piston plate 212 continues to move, it will compress the gas in air pressure frame 211. The compressed high-pressure gas will be blocked by blocking rod 215, so the gas pressure will continue to rise. When piston plate 212 moves, it will also push connecting rod 216 to rotate, changing the angle between connecting rod 216 and piston plate 212, thereby pulling blocking rod 215 up until blocking rod 215 separates from jet pipe 214. The high-pressure gas will then enter jet pipe 214 and spray out towards the road surface in front of test wheel 17 to clean the road surface. During the continuous rotation of the convex ring 122, when the spring bracket 213 separates from the protruding position of the convex ring 122, the restoring force of the spring bracket 213 is released, causing the piston plate 212 to return to its original position. After the piston plate 212 returns to its original position, the flow groove will reconnect with the left side of the piston plate 212, as... Figure 4 As shown in position G, external gas will enter the air pressure frame 211 to replenish the gas supply until the convex ring 122 squeezes the spring frame 213 again, causing high-pressure gas to be continuously ejected from the jet pipe 214. This cleans the movement path of the test wheel 17 on the road surface in real time, reducing the sand and dust in contact with the surface of the test wheel 17. This effectively prevents the test wheel 17 from having too much sand and dust adhering to its surface, which would reduce its roundness. During the rotation of the test wheel 17, periodic false displacement signals will be generated, thereby ensuring the accuracy of the test data.
[0028] The cleaning assembly 22 includes a diversion pipe 221 that runs through the inner wall of the jet pipe 214, and a scraper plate 222 is fixedly connected to the bottom of the spring frame 213. During the reciprocating movement of the spring frame 213, the scraping plate 222 also moves, repeatedly scraping the sand and dust on the surface of the rotating wheel 121, reducing the sand and dust on the surface of the rotating wheel 121. At the same time, some of the high-pressure gas entering the jet pipe 214 will be diverted into the diversion pipe 221 and continuously sprayed in front of the rotating wheel 121, reducing the sand and dust in that path and effectively preventing the rotating wheel 121 from contacting too much sand and dust. The sand and dust are relatively smooth, which will reduce the friction between the rotating wheel 121 and the road surface and affect the smooth rotation of the rotating wheel 121.
[0029] The buffer assembly 31 includes a connecting pipe 313 that is connected through the inner wall of the pneumatic sleeve 311. The outer wall of the connecting pipe 313 is connected through the inner wall of the fixed sleeve 14. The side wall of the piston rod 312 is fixedly connected to the side of the spring frame 213 near the piston plate 212. A spring ball head rod 314 is slidably connected to the inner wall of the connecting pipe 313, and a throttling hole 315 is opened on the inner wall of the fixed sleeve 14; When the spring bracket 213 moves toward the sliding sleeve 15, it also drives the piston rod 312 to move. After the piston rod 312 moves and covers the flow hole, as... Figure 7 As shown in the position of H, the gas inside the air pressure sleeve 311 will be squeezed and enter the connecting pipe 313. It will be blocked by the spring ball head rod 314, which will increase the gas pressure until the gas inside the connecting pipe 313 pushes the spring ball head rod 314 to move and separate from the inclined surface of the connecting pipe 313, so that it accumulates the rebound force and the gas will enter the fixed sleeve 14. When the spring frame 213 returns to its original position, it will drive the piston rod 312 to return to its original position. At this time, the squeezing force on the spring ball head rod 314 will disappear, and the rebound force of the spring ball head rod 314 will be released, allowing the spring ball head rod 314 to fit against the inclined surface of the connecting pipe 313, blocking the backflow of gas in the fixed sleeve 14. After the piston rod 312 returns to its original position, it will allow the flow hole to connect with the right side of the piston rod 312 again, allowing external gas to enter the pneumatic sleeve 311 until the spring frame 213 drives the piston rod 312 to move towards the sliding sleeve 15 again, squeezing the gas into the fixed sleeve 14 again. This process is repeated to continuously inject high-pressure gas into the fixed sleeve 14. The gas inside the fixed sleeve 14 will slowly flow out through the throttle hole 315. When the eight-wheel frame 13 vibrates during driving, the sliding support frame 112 supports the sliding sleeve 15 through the support component 32, keeping the sliding sleeve 15 stable. When the eight-wheel frame 13 vibrates, it will squeeze the gas inside the fixed sleeve 14 and flow out through the throttle hole 315. Since the throttle hole 315 is small, it will increase the flow resistance of the gas, reduce the vibration force of the eight-wheel frame 13, and attenuate the vibration amplitude of the eight-wheel frame 13. This effectively prevents the eight-wheel frame 13 from vibrating when driving on the road due to uneven distribution of sand and dust on the road surface. The vibration will be transmitted to the test wheel 17, causing the test wheel 17 to jump and increase the detection error.
[0030] The support assembly 32 includes a universal ball joint 324 rotatably connected to the bottom of the rotating disk 321, and a spring plate 328 fixedly connected to the top of the sliding sleeve 15. The side wall of the spring plate 328 is fixedly connected to the side wall of the rotating disk 321 by a spring. A connecting block 323 is fixedly connected to the side wall of the pneumatic frame 211, and a sliding block 325 is slidably connected to the inner wall of the connecting block 323. The bottom of the universal ball rod 324 is rotatably connected to the inner wall of the connecting block 323.
[0031] The support assembly 32 also includes a fixed disk 322 fixedly connected to the side wall of the sliding support frame 112. An arc-shaped push block 326 is fixedly connected to the top of the fixed disk 322, and the inner wall of the fixed disk 322 is slidably connected to the outer wall of the sliding block 325. When high-pressure gas is injected into the fixed sleeve 14, the high-pressure gas will exert a compressive force on the sliding sleeve 15, causing the sliding sleeve 15 to descend. The sliding sleeve 15 will drive the rotating disk 321 to descend. As the rotating disk 321 descends, the distance between it and the fixed disk 322 will shorten, which will push the universal ball rod 324 to rotate. At the same time, the universal ball rod 324 will rotate around the center of the rotating disk 321, forcing the rotating disk 321 to rotate. However, the universal ball joint 324 has an arc-shaped rod, and the convex direction of the arc surface is far away from the center of the rotating disk 321. When the rotating disk 321 descends, it will generate an outward bending moment on the arc-shaped rod of the universal ball joint 324. The arc-shaped rod of the universal ball joint 324 will generate a restoring torque to maintain the outward convex shape, pushing the rotating disk 321 to rotate counterclockwise. However, when the rotating disk 321 rotates counterclockwise, it will be blocked by the stop block 327. Therefore, the rotating disk 321 cannot rotate, and the sliding sleeve 15 cannot descend, thus providing stable support for the sliding sleeve 15.
[0032] The number of the above components is not limited. Those skilled in the art can set it freely according to actual needs, as long as the above components are installed at the corresponding component connection positions.
[0033] A specific application of this embodiment is as follows: When using this invention, if long-distance testing of asphalt pavement is required, the operator connects the eight-wheeled vehicle frame 13 to the tractor, so that the eight-wheeled vehicle frame 13 contacts the road surface, and the test wheel 17 will then contact the road surface. The weight of the counterweight 19 ensures that the test wheel 17 is in close contact with the road surface. After that, the test wheel 17 is calibrated. After calibration, the tractor is started to drive the eight-wheeled vehicle frame 13 on the road surface. During the driving process, the test wheel 17 will rotate due to the friction with the road surface. As the test wheel 17 moves on the road surface, the undulations of the road surface will cause the test wheel 17 to rise or fall, thereby driving the sliding support frame 16 to rise or fall, and pushing the output end of the linear displacement sensor 18 to rise or fall, thereby collecting the road surface smoothness data. When the eight-wheeled frame 13 contacts the ground, the rotating wheel 121 also contacts the road surface. The movement of the eight-wheeled frame 13 causes the rotating wheel 121 to move. The rotating wheel 121, affected by friction with the road surface, will rotate, causing the convex ring 122 to rotate. When the protruding part of the convex ring 122 contacts the spring frame 213, it will push the spring frame 213 towards the sliding sleeve 15, accumulating rebound force, which in turn moves the piston plate 212. When the piston plate 212 moves and covers the flow groove, as... Figure 4As shown in position G, the right side of piston plate 212 is closed at this time. As piston plate 212 continues to move, it will compress the gas in air pressure frame 211. The compressed high-pressure gas will be blocked by blocking rod 215, so the gas pressure will continue to rise. When piston plate 212 moves, it will also push connecting rod 216 to rotate, changing the angle between connecting rod 216 and piston plate 212, thereby pulling blocking rod 215 up until blocking rod 215 separates from jet pipe 214. The high-pressure gas will then enter jet pipe 214 and spray out towards the road surface in front of test wheel 17 to clean the road surface. During the continuous rotation of the convex ring 122, when the spring bracket 213 separates from the protruding position of the convex ring 122, the restoring force of the spring bracket 213 is released, causing the piston plate 212 to return to its original position. After the piston plate 212 returns to its original position, the flow groove will reconnect with the left side of the piston plate 212, as... Figure 4 As shown in the position of G, external gas will enter the air pressure frame 211 to replenish the gas until the convex ring 122 squeezes the spring frame 213 again to move, so that the jet pipe 214 continuously sprays high-pressure gas to clean the movement path of the test wheel 17 on the road surface in real time, reduce the sand and dust in contact with the surface of the test wheel 17, effectively prevent the test wheel 17 from having too much sand and dust on its surface, which would reduce its roundness. During the rotation of the test wheel 17, periodic false displacement signals will be generated, thereby ensuring the accuracy of the test data. Secondly, when the spring frame 213 moves back and forth, it will also drive the scraping plate 222 to move, repeatedly scraping the sand and dust on the surface of the rotating wheel 121, reducing the sand and dust on the surface of the rotating wheel 121. At the same time, some of the high-pressure gas entering the jet pipe 214 will be diverted into the diversion pipe 221 and continuously sprayed towards the front of the rotating wheel 121, reducing the sand and dust in that path and effectively preventing the rotating wheel 121 from contacting too much sand and dust. The sand and dust are relatively smooth, which will reduce the friction between the rotating wheel 121 and the road surface, affecting the smooth rotation of the rotating wheel 121. Secondly, when the spring bracket 213 moves towards the sliding sleeve 15, it will also drive the piston rod 312 to move. After the piston rod 312 moves and covers the flow hole, as... Figure 7 As shown in the position of H, the gas inside the air pressure sleeve 311 will be squeezed and enter the connecting pipe 313. It will be blocked by the spring ball head rod 314, which will increase the gas pressure until the gas inside the connecting pipe 313 pushes the spring ball head rod 314 to move and separate from the inclined surface of the connecting pipe 313, so that it accumulates the rebound force and the gas will enter the fixed sleeve 14. When the spring frame 213 returns to its original position, it will drive the piston rod 312 to return to its original position. At this time, the squeezing force on the spring ball head rod 314 will disappear, and the rebound force of the spring ball head rod 314 will be released, allowing the spring ball head rod 314 to fit against the inclined surface of the connecting pipe 313, blocking the backflow of gas in the fixed sleeve 14. After the piston rod 312 returns to its original position, it will allow the flow hole to connect with the right side of the piston rod 312 again, allowing external gas to enter the pneumatic sleeve 311 until the spring frame 213 drives the piston rod 312 to move towards the sliding sleeve 15 again, squeezing the gas into the fixed sleeve 14 again. This process is repeated to continuously inject high-pressure gas into the fixed sleeve 14. The gas inside the fixed sleeve 14 will slowly flow out through the throttle hole 315. When the eight-wheel frame 13 vibrates during driving, the sliding support frame 112 supports the sliding sleeve 15 through the support component 32, keeping the sliding sleeve 15 stable. When the eight-wheel frame 13 vibrates, it will squeeze the gas inside the fixed sleeve 14 and flow out through the throttle hole 315. Since the throttle hole 315 is small, it will increase the flow resistance of the gas, reduce the vibration force of the eight-wheel frame 13, and attenuate the vibration amplitude of the eight-wheel frame 13. This effectively prevents the uneven distribution of sand and dust on the road surface from increasing the vibration of the eight-wheel frame 13 when it is driving on the road. The vibration will be transmitted to the test wheel 17, causing the test wheel 17 to jump and increase the detection error. Secondly, when high-pressure gas is injected into the fixed sleeve 14, the high-pressure gas will exert a compressive force on the sliding sleeve 15, causing the sliding sleeve 15 to descend. The sliding sleeve 15 will drive the rotating disk 321 to descend. As the rotating disk 321 descends, the distance between it and the fixed disk 322 will shorten, which will push the universal ball rod 324 to rotate. At the same time, the universal ball rod 324 will rotate around the center of the rotating disk 321, forcing the rotating disk 321 to rotate. However, the universal ball joint 324 has an arc-shaped rod, and the convex direction of the arc surface is far away from the center of the rotating disk 321. When the rotating disk 321 descends, it will generate an outward bending moment on the arc-shaped rod of the universal ball joint 324. The arc-shaped rod of the universal ball joint 324 will generate a restoring torque to maintain the outward convex shape, pushing the rotating disk 321 to rotate counterclockwise. However, when the rotating disk 321 rotates counterclockwise, it will be blocked by the stop block 327. Therefore, the rotating disk 321 cannot rotate, and the sliding sleeve 15 cannot descend, thus providing stable support for the sliding sleeve 15. When the rotating wheel 121 contacts a protruding area of the road surface, it will rise, causing the sliding support frame 112 and the fixed plate 322 to rise. The fixed plate 322 will then cause the arc-shaped push block 326 to rise, pushing the universal joint 324 to rise, causing the universal joint 324 to rotate. This reduces the angle between the universal joint 324 and the connecting block 323, causing the universal joint 324 to push the sliding block 325 to fall. This shortens the distance between the balls at the top and bottom of the universal joint 324, allowing the outer wall of the universal joint 324 to move on the arc surface of the arc-shaped push block 326. The arc surface restricts the direction of movement of the universal joint 324. Figure 13 As shown in position J, when the distance between the two ends of the universal joint 324 shortens, it will generate a tangential thrust on the rotating disk 321 in a clockwise direction, forcing the rotating disk 321 to rotate clockwise, as shown in position J. Figure 12 As shown in position I, the spring plate 328 is squeezed to accumulate rebound force, which effectively prevents the test wheel 17 from contacting the road surface with large undulations. When the test wheel 17 comes into contact with the road surface with large undulations, the output end of the linear displacement sensor 18 will rise and the rotating wheel 121 will rise synchronously, which will drive the sliding sleeve 15 and the linear displacement sensor 18 to rise, so that the linear displacement sensor 18 is in a relatively stationary state. The output end of the linear displacement sensor 18 does not show obvious movement, making it difficult to accurately reflect the rising range of the test wheel 17.
[0034] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims
1. An asphalt concrete paving smoothness testing device, comprising an eight-wheeled vehicle frame (13), a fixed sleeve (14) fixedly connected to the bottom of the eight-wheeled vehicle frame (13), a sliding sleeve (15) provided at the bottom of the eight-wheeled vehicle frame (13), the outer wall of the sliding sleeve (15) being slidably connected to the inner wall of the fixed sleeve (14), and a sliding support frame (16) slidably connected to the inner wall of the sliding sleeve (15). The inner wall of the sliding support frame one (16) is rotationally connected with a test wheel (17), the inner wall of the sliding sleeve (15) is fixedly connected with a linear displacement sensor (18), the output end bottom of the linear displacement sensor (18) is fixedly connected with the top of the sliding support frame one (16), and the outer wall of the sliding support frame one (16) is fixedly connected with a counterweight (19), characterized in that, Also includes: The main body (1) is fixedly installed at the bottom of the eight-wheeled frame (13) to provide a support point; The cleaning mechanism (2) is fixedly installed at the bottom of the eight-wheeled vehicle frame (13) and is used to clean the road surface; A stabilizing mechanism (3) is rotatably disposed on the inner wall of the sliding sleeve (15) to support the sliding sleeve (15). When conducting long-distance testing of asphalt pavement, the eight-wheeled vehicle frame (13) is connected to the tractor, so that the test wheel (17) contacts the road surface. The tractor drives the eight-wheeled vehicle frame (13) and the test wheel (17) to move on the road surface. The test wheel (17) moves up and down following the undulations of the road surface, so that the linear displacement sensor (18) moves and measures the smoothness of the road surface.
2. The asphalt concrete paving evenness detection apparatus of claim 1, wherein: The main body (1) includes: Telescopic assembly (11), which is fixedly mounted on the bottom of the eight-wheel frame (13); Rotating assembly (12), which is rotatably disposed on the inner wall of telescopic assembly (11); In this process, the rotating component (12) slides inside the telescopic component (11), causing the rotating component (12) to contact the ground. When the eight-wheeled frame (13) moves, the rotating component (12) will rotate due to the friction with the ground.
3. The asphalt concrete paving evenness detection apparatus of claim 1, wherein: The cleaning mechanism (2) includes: The jet assembly (21) is fixedly mounted on the bottom of the eight-wheeled frame (13) by means of fasteners; The fastener includes a pneumatic frame (211) fixedly connected to the bottom of the eight-wheel frame (13), and a piston plate (212) is slidably connected to the inner wall of the pneumatic frame (211). A cleaning assembly (22) is fixedly disposed on the inner wall of the jet assembly (21); Among them, the jet assembly (21) sprays gas onto the road surface to sweep away the sand and dust on the road surface, and the sweeping assembly (22) cleans the sand and dust on the surface of the rotating assembly (12).
4. The asphalt concrete paving smoothness testing device according to claim 1, characterized in that: The stabilizing mechanism (3) includes: A buffer assembly (31) is fixedly mounted at the bottom of the pneumatic frame (211) via a connector; The connector includes a pneumatic sleeve (311) fixedly connected to the bottom of the pneumatic frame (211), and a piston rod (312) is slidably connected to the inner wall of the pneumatic sleeve (311). Support assembly (32), which is rotatably disposed on the inner wall of sliding sleeve (15) via a rotating component; The rotating component includes a rotating disk (321) rotatably connected to the inner wall of the sliding sleeve (15), and a stop block (327) is fixedly connected to the top of the sliding sleeve (15). The vibration transmitted from the eight-wheel frame (13) to the test wheel (17) is reduced by the buffer component (31), and the sliding sleeve (15) is supported by the support component (32) to keep the sliding sleeve (15) stable.
5. The asphalt concrete paving smoothness testing device according to claim 2, characterized in that: The telescopic assembly (11) includes a connecting sleeve (111) fixedly connected to the bottom of the eight-wheeled vehicle frame (13). The bottom of the eight-wheeled vehicle frame (13) is provided with a sliding support frame two (112). The inner wall of the connecting sleeve (111) is slidably connected to the outer wall of the sliding support frame two (112). The rotating assembly (12) includes a rotating wheel (121) disposed at the bottom of the eight-wheeled frame (13). The outer wall of the rotating wheel (121) is rotatably connected to the inner wall of the sliding support frame (112). A protruding ring (122) is fixedly connected to the side wall of the rotating wheel (121). In this process, the rotating wheel (121) is brought into contact with the road surface. When the eight-wheeled vehicle frame (13) is traveling on the road surface, the rotating wheel (121) will rotate due to the friction between it and the road surface, which will drive the convex ring (122) to rotate.
6. The asphalt concrete paving smoothness testing device according to claim 3, characterized in that: The jet assembly (21) includes a spring frame (213) fixedly connected to the side wall of the piston plate (212). The side of the spring frame (213) away from the piston plate (212) is slidably connected to the side wall of the convex ring (122). A jet pipe (214) is connected through the inner wall of the air pressure frame (211). A blocking rod (215) is slidably connected to the inner wall of the jet pipe (214), and a connecting rod (216) is rotatably connected to the side of the piston plate (212) away from the spring frame (213). The inner wall of the connecting rod (216) is rotatably connected to the top of the blocking rod (215). When the convex ring (122) rotates, the protruding part of the convex ring (122) will contact the spring frame (213), thereby pushing the spring frame (213) to move, causing the piston plate (212) to move, squeezing the gas in the air pressure frame (211), and finally, the squeezed gas is ejected through the jet pipe (214) to clean the road surface.
7. The asphalt concrete paving smoothness testing device according to claim 6, characterized in that: The cleaning assembly (22) includes a diversion pipe (221) that runs through the inner wall of the jet pipe (214), and a scraper plate (222) is fixedly connected to the bottom of the spring frame (213). Among them, some of the high-pressure gas entering the jet pipe (214) will enter the diverter pipe (221) and be sprayed out in front of the convex ring (122). At the same time, when the spring frame (213) moves, it will also drive the scraper plate (222) to move, scraping away the sand particles on the surface of the rotating wheel (121).
8. The asphalt concrete paving smoothness testing device according to claim 4, characterized in that: The buffer assembly (31) includes a connecting pipe (313) that is connected through the inner wall of the pneumatic sleeve (311), the outer wall of the connecting pipe (313) being connected through the inner wall of the fixed sleeve (14), and the side wall of the piston rod (312) being fixedly connected to the side of the spring frame (213) near the piston plate (212). A spring ball joint rod (314) is slidably connected to the inner wall of the connecting pipe (313), and a throttling hole (315) is opened on the inner wall of the fixing sleeve (14). When the spring frame (213) moves, it will also drive the piston rod (312) to move, squeezing the gas in the pneumatic sleeve (311) and entering the fixed sleeve (14) through the connecting pipe (313) and the spring ball head rod (314).
9. The asphalt concrete paving smoothness testing device according to claim 4, characterized in that: The support assembly (32) includes a universal ball joint (324) rotatably connected to the bottom of the rotating disk (321), and a spring plate (328) is fixedly connected to the top of the sliding sleeve (15). The side wall of the spring plate (328) is fixedly connected to the side wall of the rotating disk (321) by a spring. A connecting block (323) is fixedly connected to the side wall of the air pressure frame (211), and a sliding block (325) is slidably connected to the inner wall of the connecting block (323). The bottom of the universal ball rod (324) is rotatably connected to the inner wall of the connecting block (323).
10. The asphalt concrete paving smoothness testing device according to claim 9, characterized in that: The support assembly (32) further includes a fixed disk (322) fixedly connected to the side wall of the sliding support frame (112). An arc-shaped push block (326) is fixedly connected to the top of the fixed disk (322). The inner wall of the fixed disk (322) is slidably connected to the outer wall of the sliding block (325). When both the rotating wheel (121) and the test wheel (17) are in contact with the road surface, the sliding sleeve (15) will descend, causing the rotating disk (321) to rotate counterclockwise. The stop block (327) will block the rotating disk (321) from rotating, so the sliding sleeve (15) cannot descend, thus supporting the sliding sleeve (15).