Asphalt concrete pavement compaction quality detection device and use method

Abstract

This invention provides an asphalt concrete pavement compaction quality testing device and its usage method, including a roller support, a measuring component on the outside of the roller support, the measuring component including sensor group one and sensor group two, and an encoder between the roller support and the roller drum. This application uses two sets of symmetrical sensors to achieve closed-loop acquisition of rebound parameters before and after compaction at the same point, and with the encoder, accurately records the number of compaction passes and displacement. The background system intelligently determines the compaction quality based on the difference in rebound parameters. The entire process is automated and requires no manual intervention. The seismic structure and free-fall design eliminate vibration and tension interference, and the acquired data is true and reliable. This solves the problems of existing asphalt pavement compaction quality testing methods, such as inability to accurately distinguish the number of compaction passes, poor real-time performance, and lack of quantifiable basis for judgment.

Description

Technical Field

[0001] This invention relates to the field of compaction testing, and in particular to a device and method for testing the compaction quality of asphalt concrete pavement. Background Technology

[0002] In asphalt concrete pavement construction, compaction quality directly determines the pavement's strength, smoothness, and service life, and the number of compaction passes is one of the key factors affecting compaction quality. Currently, the traditional method for testing asphalt concrete pavement is for technicians to use the ring cutter method to test pavement compaction, which is inefficient, labor-intensive, and difficult to meet the required testing frequency. Intelligent pavement paving construction uses a different method: first, a test section is built to determine the number of compaction passes; then, satellite positioning is used to analyze the roller's travel trajectory to determine the exact number of passes, avoiding under-compaction and missed compaction.

[0003] Furthermore, existing testing technologies cannot accurately compare pavement parameters at the same measuring point before and after compaction. They cannot intuitively reflect the compaction effect through parameter differences, resulting in a lack of scientific and quantifiable basis for judging compaction quality, which makes it difficult to meet the efficient and accurate testing needs of modern asphalt pavement construction.

[0004] Therefore, developing an asphalt pavement compaction quality testing system and method that can accurately distinguish the number of compaction passes, improve testing efficiency, and achieve real-time intelligent decision-making has become an urgent technical problem to be solved in the field of road engineering construction. Summary of the Invention

[0005] The main objective of this invention is to provide an asphalt concrete pavement compaction quality testing device and its usage method, which solves the problems of existing asphalt pavement compaction quality testing methods that cannot accurately distinguish the number of compaction passes, have poor real-time performance, and lack quantifiable basis for judgment.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an asphalt concrete pavement compaction quality testing device, including a roller support, a measuring component on the outside of the roller support, the measuring component including a sensor group one and a sensor group two, and an encoder is also provided between the roller support and the roller of the road roller.

[0007] In the preferred embodiment, the roller support includes a front end and a rear end of the roller frame, and a roller bearing is provided between the front end and the rear end of the roller frame. The roller bearing is used to install the roller of the road roller, and the encoder is installed between the roller support and the roller of the road roller.

[0008] In the preferred embodiment, sensor group one and sensor group two have the same structure, but the sensor numbers on sensor group one and sensor group two are different. The sensor assembly includes a sensor bracket, which is symmetrically arranged at the front and rear ends of the cylinder frame. The sensor bracket is equipped with multiple anti-vibration brackets, and an anti-vibration slide that can slide up and down is fitted on the anti-vibration bracket. A transverse support is provided on one side of the anti-vibration slide, and a transverse slide block is provided on the transverse support. A counterweight head that can be lowered is provided below the transverse slide block, and a sensor is provided at the top of the counterweight head.

[0009] In the preferred embodiment, the sensors include sensor A1, sensor A2, sensor B1 and sensor B2, with sensor A1 and sensor A2 arranged on sensor group one, and sensor B1 and sensor B2 arranged on sensor group two. Sensors A1, A2, B1, and B2 are rebound sensors. Sensor group one is located at the front end of the cylinder frame, and sensor group two is located at the rear end of the cylinder frame.

[0010] In the preferred embodiment, the seismic slide is provided with a guide rod, which is slidably connected to the seismic support, and a spring is also provided between the seismic slide and the seismic support; The seismic bracing is equipped with a tensioning electric cylinder inside. The output shaft of the tensioning electric cylinder is equipped with a tensioning wire. The tensioning electric cylinder is used to lift the seismic slide upward, so that the seismic slide is temporarily fixed against the seismic bracing.

[0011] In the preferred embodiment, the transverse support is provided with a through transverse sliding groove, and two transverse sliding blocks are provided in the transverse sliding groove. Transverse guide rails are also provided on both sides of the transverse sliding groove, and the transverse sliding blocks are slidably connected to the transverse guide rails. Below the transverse slide is a wire feeding bracket, below the wire feeding bracket is a counterweight head, and between the counterweight head and the wire feeding bracket is a wire feeding mechanism. A transverse motor is also located on one side of the transverse support, and a transverse lead screw is located at the output shaft end of the transverse motor. The transverse lead screw passes through two transverse slides that can move laterally, and the rotation of the transverse lead screw can drive the transverse slides to slide on the transverse guide rail.

[0012] In the preferred embodiment, the counterweight head has a cavity, and the lower end of the lowered wire has a movable buckle. The movable buckle is movably connected to the cavity, and the cavity is used to reduce the influence of the lowered wire on the sensor's springback parameters. The inside of the wire feeding bracket is also equipped with a rotatable take-up roller. A lifting cylinder is provided on one side of the take-up roller. A take-up motor is provided at the output shaft end of the lifting cylinder. The lifting cylinder is used to make the take-up motor hold the take-up roller. The take-up motor is used to control the rotation of the take-up roller. A rubber sheet is provided at the top of the output shaft of the take-up motor to increase the friction between it and the take-up roller.

[0013] The method of using the above-mentioned asphalt concrete pavement compaction quality testing device includes: S1. Select measuring points for calibration. Stop the road roller from compacting and vibrating. The background control tensioning cylinder lifts the anti-seismic slide frame and temporarily fixes it against the anti-seismic support, so that sensor group one and sensor group two are at the same height. S2. The background control of the transverse motor drives the transverse slide to keep the parameters of the rangefinders on sensor group one and sensor group two consistent, and keep the position fixed after positioning. S3. After maintaining the same height and distance, the background control lifting cylinder releases the winding roller. Sensors A1 and A2 fall freely to measure the rebound parameters and then reset. The background compares the preset parameters and adjusts the difference to calibrate the sensors. S4. The roller compacts the measuring point once. Sensors B1 and B2 are free-falling to measure the rebound parameters and then reset. The background compares the preset parameters and adjusts the difference to complete the sensor group calibration. S5. During the compaction process, the roller is periodically stopped at the test point, and the background control sensors A1 and A2 are allowed to fall freely to collect the rebound parameters of the previous compacted road surface. S6. The back-end uses the coordinates of the free fall points of sensors A1 and A2 as anchor points. The roller starts rolling, and the encoder synchronously records the number of rolling circles and compaction passes. S7. The roller moves forward according to the encoder parameters. After sensor B1 and sensor B2 move to the anchor point, the roller stops vibrating. S8. The background control sensors B1 and B2 collect the road surface rebound parameters after the compaction and complete the reset. S9. The background compares the parameters of sensors A1 and A2 with those of sensors B1 and B2 before and after the comparison with the preset standards. Combined with the number of encoder passes, it determines and instructs to re-pressure or switch to the next measurement point.

[0014] In the preferred embodiment, during steps S1-S8, the road roller maintains a stopped rolling vibration and a normally running engine while performing all detection and alignment actions; The background control system uniformly controls the tensioning electric cylinder, the transverse motor, the lifting cylinder, and the winding roller to coordinate their actions, and sequentially completes the sensor group's height positioning, equidistant calibration, free fall detection, coordinate anchoring, rolling follow-up, alignment re-measurement, and intelligent judgment. Sensors A1 and A2, as well as sensors B1 and B2, all employ a detection method that involves first acquiring parameters and then resetting them to their original positions. The rangefinder is used to ensure the alignment accuracy between sensor group one and sensor group two. The encoder records the compaction data in real time and provides a basis for the movement and positioning of the road roller.

[0015] In the preferred embodiment, the method includes: after sensor group one and sensor group two have completed the same height and distance calibration, their positions remain fixed until the calibration process of the current measuring point is completed. After the measurement stage is completed, the tensioning electric cylinder releases the anti-vibration slide and the anti-vibration support, so that the anti-vibration slide and the anti-vibration support can move relative to each other to reduce the impact of vibration and rolling on the sensor. During the compaction process, the drop measurement points of sensors A1 and A2 are used as anchor points. Sensors B1 and B2 move to the anchor point with the roller before the compaction parameters are collected. The system compares the difference in rebound parameters before and after compaction with preset standards, and combines this with the number of compaction passes recorded by the encoder to automatically control the roller to perform re-compaction or jump to the next measuring point.

[0016] This invention provides an asphalt concrete pavement compaction quality testing device and its usage method, which has the following beneficial effects: 1. This application uses two sets of symmetrical sensors to achieve closed-loop acquisition of rebound parameters before and after compaction at the same point. With the help of an encoder, it achieves accurate recording of the number of compaction passes and displacement. The background intelligently determines the compaction quality through the difference in rebound parameters. The whole process is automated and requires no manual intervention. The seismic structure and free fall design eliminate vibration and tension interference, and the acquired data is true and reliable. 2. Equal height and equal spacing alignment calibration ensures consistent detection points, completely solving the problems of lagging, low accuracy and strong subjectivity in traditional road compaction detection. The device structure and method process are fully disclosed, clear and complete, meeting the requirements of sufficient disclosure under the Patent Law. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a logic flowchart of the detection method of the present invention; Figure 2 This is a schematic diagram of the layout of the detection device of the present invention; Figure 3 This is a front view schematic diagram of the detection device of the present invention; Figure 4 This is a cross-sectional schematic diagram of the roller support of the present invention; Figure 5 This is an isometric view of the detection device of the present invention from another direction; Figure 6 This is an isometric view of the sensor group of the present invention; Figure 7 This is a cross-sectional schematic diagram of sensor group one of the present invention; Figure 8 This is a cross-sectional schematic diagram of the counterweight head of the present invention; Figure 9 This is a cross-sectional schematic diagram of the wire laying support of the present invention.

[0018] In the diagram: 1. Roller support; 101. Front end of the roller frame; 102. Rear end of the roller frame; 2. Measuring assembly; 3. Sensor group one; 301. Sensor support; 302. Anti-vibration support; 303. Anti-vibration slide; 304. Lateral movement support; 305. Sensor A1; 307. Sensor A2; 308. Lateral movement chute; 309. Lateral movement motor; 310. Lateral movement slide block; 311. Lateral movement guide rail; 312. Displacement wire; 313. Guide rod; 314. Spring; 315. Tensioning wire; 316. Tensioning cylinder; 317. Counterweight head; 318. Lateral movement screw; 319. Cavity; 320. Movable buckle; 321. Rewinding motor; 322. Lifting cylinder; 323. Rewinding roller; 324. Sensor group two; 4. Sensor B1401; Sensor B2402; Encoder 5. Detailed Implementation

[0019] Example 1 like Figure 1-9 As shown, an asphalt concrete pavement compaction quality testing device includes a roller support 1, a measuring component 2 is provided on the outside of the roller support 1, the measuring component 2 includes a sensor group 3 and a sensor group 4, and an encoder 5 is also provided between the roller support 1 and the roller of the road roller.

[0020] In the preferred embodiment, the roller support 1 includes a front end 102 and a rear end 103 of the roller frame. A roller bearing 101 is provided between the front end 102 and the rear end 103 of the roller frame. The roller bearing 101 is used to install the roller of the road roller. The encoder 5 is arranged between the roller support 1 and the roller of the road roller.

[0021] In the preferred embodiment, sensor group 3 and sensor group 4 have the same structure, but the sensor numbers on sensor group 3 and sensor group 4 are different. Sensor group 3 includes sensor bracket 301, which is symmetrically arranged at the front end 102 and rear end 103 of the cylindrical frame. Multiple anti-vibration brackets 302 are provided on the sensor bracket 301. Anti-vibration slides 303 that can slide up and down are fitted on the anti-vibration brackets 302. A transverse support 304 is provided on one side of the anti-vibration slide 303. A transverse slide block 310 that can slide is provided on the transverse support 304. A counterweight head 318 that can fall is provided below the transverse slide block 310. A sensor is provided at the top of the counterweight head 318.

[0022] In the preferred embodiment, the sensors include sensor A1306, sensor A2307, sensor B1401 and sensor B2402. Sensor A1306 and sensor A2307 are arranged on sensor group 1 3, and sensor B1401 and sensor B2402 are arranged on sensor group 2 4. Sensors A1306, A2307, B1401 and B2402 are rebound sensors. Sensor group 1 3 is located at the front end 102 of the cylinder frame, and sensor group 2 4 is located at the rear end 103 of the cylinder frame.

[0023] In the preferred embodiment, the seismic slide 303 is provided with a guide rod 314, which is slidably connected to the seismic support 302, and a spring 315 is also provided between the seismic slide 303 and the seismic support 302; The seismic bracing 302 is equipped with a tensioning electric cylinder 317. The output shaft of the tensioning electric cylinder 317 is equipped with a tensioning wire 316. The tensioning electric cylinder 317 is used to lift the seismic slide 303 upward so that the seismic slide 303 is temporarily fixed against the seismic bracing 302.

[0024] In the preferred embodiment, the transverse support 304 is provided with a through transverse sliding groove 308, and two transverse sliding blocks 310 that can move laterally are provided in the transverse sliding groove 308. Transverse guide rails 311 are also provided on both sides of the transverse sliding groove 308, and the transverse sliding blocks 310 and the transverse guide rails 311 are slidably connected. Below the transverse slide 310 is a wire feeding bracket 305, below the wire feeding bracket 305 is a counterweight head 318, and between the counterweight head 318 and the wire feeding bracket 305 is a wire feeding 316. On one side of the transverse support 304 is a transverse motor 309, and at the output shaft end of the transverse motor 309 is a transverse lead screw 319. The transverse lead screw 319 passes through two transverse slides 310 that can move laterally. The rotation of the transverse lead screw 319 can drive the transverse slide 310 to slide on the transverse guide rail 311.

[0025] In the preferred embodiment, the counterweight head 318 is provided with a cavity 320, and the lower end of the lower wire 316 is provided with a movable buckle 321. The movable buckle 321 is movably connected to the cavity 320. The cavity 320 is used to reduce the influence of the lower wire 316 on the sensor's rebound parameters. The wire feeding bracket 305 is also equipped with a rotatable take-up roller 324. A lifting cylinder 323 is provided on one side of the take-up roller 324. A take-up motor 322 is provided at the output shaft end of the lifting cylinder 323. The lifting cylinder 323 is used to make the take-up motor 322 hold the take-up roller 324. The take-up motor 322 is used to control the rotation of the take-up roller 324. A rubber sheet is provided at the top of the output shaft of the take-up motor 322 to increase the friction between it and the take-up roller 324.

[0026] The method of using the above-mentioned asphalt concrete pavement compaction quality testing device includes: S1. Select measuring points for calibration. Stop the road roller from rolling and vibrating. The background control tensioning cylinder 317 lifts the anti-seismic slide 303 and temporarily fixes it against the anti-seismic bracket 302, so that sensor group 1 3 and sensor group 2 4 are at the same height. S2. The background control lateral motor 309 drives the lateral slide block 310 to keep the parameters of the rangefinder 312 on sensor group 1 3 and sensor group 2 4 consistent, and keep the position fixed after positioning. S3. After maintaining the same height and distance, the background control lifting cylinder 323 releases the winding roller 324. Sensors A1306 and A2307 are free-falling to measure the rebound parameters and then reset. The background compares the preset parameters and adjusts the difference to calibrate the sensors. S4. The roller compacts the measuring point once. Sensors B1401 and B2402 are free-falling to measure the rebound parameters and then reset. The background compares the preset parameters and adjusts the difference to complete the sensor group calibration. S5. During the compaction process, the roller is periodically stopped at the test point, and the background control sensors A1306 and A2307 are allowed to fall freely to collect the rebound parameters of the previous compacted road surface. S6. The back-end uses the free fall point coordinates of sensors A1306 and A2307 as anchor points, the road roller starts rolling, and encoder 5 synchronously records the number of rolling circles and compaction passes. S7. Based on the parameters of encoder 5, the roller moves forward and compacts. After sensor B1401 and sensor B2402 move to the anchor point, the roller stops vibrating. S8. The background control sensors B1401 and B2402 collect the road surface rebound parameters after the compaction and complete the reset. S9. The background compares the parameters of sensors A1306 and A2307 with those of sensors B1401 and B2402 before and after the comparison with the preset standards. Based on the encoder's 5 passes, it determines and instructs to re-pressure or switch to the next measurement point.

[0027] In the preferred embodiment, during steps S1-S8, the road roller maintains a stopped rolling vibration and a normally running engine while performing all detection and alignment actions; The background control system uniformly controls the tensioning electric cylinder 317, the transverse motor 309, the lifting cylinder 323, and the winding roller 324 to coordinate their actions, and sequentially complete the sensor group's height positioning, distance calibration, free fall detection, coordinate anchoring, rolling follow-up, alignment re-measurement, and intelligent judgment. Sensors A1306, A2307, B1401, and B2402 all adopt a detection method of first acquiring parameters and then resetting them. The rangefinder 312 is used to ensure the alignment accuracy of sensor group 3 and sensor group 4. The encoder 5 records the compaction data in real time and provides a basis for the movement and positioning of the road roller.

[0028] In the preferred embodiment, the method includes: after sensor group 1 3 and sensor group 2 4 complete the equal height and equal distance calibration, their positions are kept fixed until the calibration process of the current measuring point is completed. After the measurement stage is completed, the tensioning cylinder 317 releases the anti-vibration slide 303 and the anti-vibration support 302, so that the anti-vibration slide 303 and the anti-vibration support 302 can move relative to each other to reduce the impact of vibration and rolling on the sensors. During the compaction process, the drop measurement points of sensors A1306 and A2307 are used as anchor points. Sensors B1401 and B2402 move to the anchor point with the roller before the compaction parameters are collected. The system compares the difference in rebound parameters before and after compaction with the preset standard, and combines this with the number of compaction passes recorded by encoder 5 to automatically control the roller to perform re-compaction or jump to the next measuring point.

[0029] Example 2 Further explanation in conjunction with Example 1, such as Figure 1-9 The detailed implementation of an asphalt concrete pavement compaction quality testing device, as shown in the figure, is as follows: the whole assembly is installed at the roller position of the road roller, and moves, compacts and tests synchronously with the road roller, realizing real-time acquisition and intelligent judgment of pavement rebound parameters during the compaction process; The device includes a roller support 1, and a measuring component 2 is fixedly installed on the outside of the roller support 1. The measuring component 2 is divided into a sensor group 1 3 and a sensor group 2 4 that work independently and are structurally symmetrical. An encoder 5 is also coaxially installed at the rotating mating part of the roller support 1 and the roller of the road roller. The encoder 5 collects the number of rotations, displacement distance and compaction passes of the roller in real time and transmits the data to the background control system in real time. The roller support 1, as an integral load-bearing structure, includes a front end 102 and a rear end 103 of the roller frame. A roller bearing 101 is fixedly installed between the front end 102 and the rear end 103 of the roller frame. The roller bearing 101 is used to coaxially assemble the roller of the road roller to ensure smooth roller rotation without radial movement. The encoder 5 is closely arranged in the mating gap between the roller support 1 and the roller of the road roller to avoid the rolling vibration from interfering with data acquisition. Sensor group 3 and sensor group 4 have identical mechanical structures, differing only in sensor numbering and detection sequence. This facilitates the backend system in distinguishing between data collected before and after compaction, preventing data confusion. Sensor group 3 is fixedly mounted on the front end 102 of the cylinder frame and is equipped with sensor A1306 and sensor A2307. Sensor group 2 4 is fixedly mounted on the rear end 103 of the cylinder frame and carries sensor B1401 and sensor B2402. Sensors A1306, A2307, B1401, and B2402 are all road rebound sensors used to collect the rebound characteristic parameters of asphalt pavement under free fall impact.

[0030] Sensor assembly 3 includes sensor brackets 301 symmetrically fixed to the front end 102 and rear end 103 of the cylindrical frame. Multiple anti-vibration brackets 302 are vertically arranged on the sensor brackets 301. An anti-vibration slide 303 that can slide up and down in the vertical direction is sleeved on the outside of the anti-vibration brackets 302. A guide rod 314 is inserted inside the anti-vibration slide 303. The guide rod 314 slides vertically with the anti-vibration bracket 302. A spring 315 is installed between the anti-vibration slide 303 and the anti-vibration bracket 302. Under normal conditions, the spring 315 keeps the anti-vibration slide 303 in a floating and shock-absorbing state.

[0031] An electric tensioning cylinder 317 is fixedly installed inside the seismic brace 302. The output end of the electric tensioning cylinder 317 is connected to the tensioning wire 316. During the testing and calibration stage, the electric tensioning cylinder 317 pulls the seismic slide 303 upward through the tensioning wire 316, so that the seismic slide 303 and the seismic brace 302 are in contact and temporarily rigidly fixed to ensure the accuracy of the testing and positioning. During the compaction and travel stage, the electric tensioning cylinder 317 releases the tensioning wire 316, and the seismic slide 303 resumes floating and damping under the action of the spring 315, reducing the damage to the sensor and data interference caused by the compaction vibration.

[0032] The seismic slide 303 has a horizontally fixed transverse support 304 on one side. The transverse support 304 has a through transverse sliding groove 308 inside. The transverse sliding groove 308 has transverse guide rails 311 fixed on both sides. Two independent transverse sliding blocks 310 are slidably mounted on the transverse guide rails 311. The transverse support 304 has a fixed transverse motor 309 at one end. The output shaft of the transverse motor 309 is connected to the transverse lead screw 319. The transverse lead screw 319 passes through the two transverse sliding blocks 310. The transverse motor 309 drives the transverse lead screw 319 to rotate in the forward or reverse direction, which can precisely control the horizontal displacement of the transverse sliding blocks 310 along the transverse guide rails 311 and realize sensor alignment adjustment.

[0033] A wire feeding bracket 305 is fixed below the transverse slide block 310. A free-falling counterweight head 318 is installed below the wire feeding bracket 305, and a corresponding sensor is fixed at the top of the counterweight head 318. A take-up roller 324 is rotatably installed inside the wire feeding bracket 305. The wire feeding line 316 is connected between the take-up roller 324 and the counterweight head 318. A lifting cylinder 323 is installed on one side of the take-up roller 324. A take-up motor 322 is fixed at the output end of the lifting cylinder 323. A rubber friction plate is installed at the output end of the take-up motor 322. During testing, the lifting cylinder 323 retracts, the winding motor 322 separates from the winding roller 324, the winding roller 324 rotates freely, and the counterweight head 318 drives the sensor to fall freely and contact the road surface. During reset, the lifting cylinder 323 extends, the winding motor 322 presses against the winding roller 324, and drives the winding roller 324 to rotate through friction, retracting the lowered yarn 316 and completing the sensor reset.

[0034] The counterweight head 318 has a cavity 320 inside, and a movable buckle 321 is set at the lower end of the lower wire 316. The movable buckle 321 is movably engaged with the cavity 320. During the drop test, the movable buckle 321 can move slightly in the cavity 320 to eliminate the interference of the lower wire 316 on the acquisition of rebound parameters and ensure that the acquired data is true and accurate.

[0035] Rangefinders 312 are installed on the transverse sliding blocks 310 of both sensor group 3 and sensor group 4. The rangefinders 312 collect the horizontal distance and height difference of the two groups of sensors in real time and transmit the data to the backend. The backend adjusts the transverse motor 309 and the tensioning cylinder 317 to ensure that sensor group 3 and sensor group 4 are strictly aligned at the same height, distance, and axis, so as to ensure that the detection points are consistent.

[0036] During all detection and alignment actions, the road roller remains in a stopped rolling vibration state with the travel engine running normally to avoid vibration interference with parameter acquisition. The background control system coordinates the actions of all components in a unified manner, as follows: S1. Measurement point selection and contour calibration: Select the road surface measurement point as the calibration or test point. After the road roller travels to the point, stop rolling and vibrating. The background control tensioning cylinder 317 tightens the tensioning wire 316 and pulls the seismic slide 303 upward, so that the seismic slide 303 and the seismic support 302 are rigidly fixed against each other, eliminating structural gaps and keeping the sensor group 1 3 and sensor group 2 4 at the same height reference.

[0037] S2. Equidistant alignment calibration: The background control motor 309 drives the transverse slide 310 to slide along the transverse guide rail 311, and reads the feedback data of the rangefinders 312 on sensor group 1 3 and sensor group 2 4 in real time until the distance and height data collected by the two rangefinders 312 are completely consistent. The background locks the position of the transverse slide 310 to keep the alignment state fixed.

[0038] S3. After the sensor group is calibrated and collected, and the elevation and distance positioning are completed, the background control of the lifting cylinder 323 retracts, the winding roller 324 is released, and the counterweight head 318 drives the sensor A1306 and sensor A2307 to fall freely to contact the road surface. Sensors A1306 and A2307 synchronously collect real-time rebound amplitude, rebound attenuation rate, impact peak value, stable rebound value, and collection timestamp, and the data is wirelessly transmitted to the backend in real time. After the data collection is completed, the lifting cylinder 323 extends, the winding motor 322 drives the winding roller 324 to retract the lowered yarn 316, and the sensor quickly resets. The system will compare the collected rebound parameters with the system's preset standard rebound parameters, calculate the parameter difference, and perform zero-point calibration and error correction on sensor group 3.

[0039] S4. Sensor group two calibration and acquisition: The road roller performs one compaction operation on the current calibration point, and stops vibrating after compaction is completed; The background controls sensor B1401 and sensor B2402 to fall freely and collect road surface rebound parameters after compaction, such as amplitude, attenuation rate, peak value, stable value, and timestamp. After the acquisition is completed, the system is reset. The backend compares the data from sensors B1401 and B2402 with preset parameters to complete the overall sensor group error correction and ensure that the two groups of sensors have a unified data acquisition benchmark.

[0040] S5. Road surface parameter acquisition before compaction: During the formal compaction process, the road roller periodically travels to the test point and stops vibrating; the background control sensor A1306 and sensor A2307 are free-falling to collect the road surface rebound parameters before this cycle of rolling, including the initial rebound amplitude, initial decay period, and initial stable value, and mark the point coordinates and acquisition time as the compaction comparison benchmark data.

[0041] S6. Anchor point positioning and compaction operation: The background system uses the free fall coordinates of sensors A1306 and A2307 as anchor points and records the three-dimensional coordinate data of the anchor points. When the roller starts the compaction operation, encoder 5 collects the number of roller rotations, travel distance, and number of compaction passes in real time, and the data is synchronously uploaded to the background storage.

[0042] S7. Roller movement and anchor point alignment: The background reads the displacement data of encoder 5 in real time and controls the roller to move forward along the rolling path until sensor B1401 and sensor B2402 move with the roller to the above-mentioned anchor point coordinate position. The roller stops rolling vibration and waits for the parameter acquisition after compaction.

[0043] S8. After compaction, the road surface parameters are collected. The background controls the sensors B1401 and B2402 to fall freely and collect the road surface rebound parameters after this cycle of rolling is completed, including the rebound amplitude, attenuation rate, peak value, stable value, and timestamp. After the data collection is completed, the sensors are automatically reset and wait for the next round of testing.

[0044] S9. Intelligent background judgment and process switching; the background performs closed-loop comparison processing on the collected data: Extract the pre-compaction rebound parameters of sensors A1306 and A2307; Extract the springback parameters after compaction from sensors B1401 and B2402; Calculate the difference in rebound amplitude, the difference in attenuation rate, and the rate of change of stable value before and after compaction; The calculation results are compared with the preset compaction qualification parameter range, and the number of compaction passes recorded by encoder 5 is also considered. If the parameter difference falls within the acceptable range, the compaction is deemed to have met the standard, and the system instructs the roller to move to the next measuring point. If the parameter difference exceeds the acceptable range, it is determined that the compaction is insufficient. The system will instruct the roller to return to the anchor point for re-compaction until the parameters meet the standard.

[0045] Example 3 Detailed and implementable parameter acquisition, calibration, and preset rules; The sensor uniformly collects the following parameters: instantaneous peak value of rebound, stable value of rebound, rebound attenuation period, signal duration, acquisition timestamp, and point coordinates.

[0046] For data transmission and storage, the sensors use wireless real-time transmission, and the backend stores data in categories such as location, time, sensor number, and before and after compaction, forming a traceable detection database.

[0047] The calibration logic compares the parameters collected during the calibration phase with preset standard values, and the background automatically corrects sensor zero drift and system errors to ensure consistent acquisition accuracy between the two sets of sensors.

[0048] The preset parameter setting rules allow for the pre-entry of parameters into the system based on the asphalt concrete grade, pavement structure layer type, and construction specification requirements. These parameters can be flexibly modified in the background according to different working conditions to adapt to different pavement construction scenarios.

[0049] Example 4 The logic of vibration damping and resetting is as follows: During calibration or testing: the tensioning electric cylinder 317 is used for tensioning, and the anti-vibration slide 303 is used for rigid fixation to ensure positioning accuracy; During the compaction or walking stage: the tensioning cylinder 317 is released, and the anti-vibration slide 303 floats and absorbs shock under the action of spring 315 to protect the sensor; Reset logic: After each drop collection is completed, the lifting cylinder 323 immediately activates, and the winding motor 322 drives the winding roller 324 to quickly reset without jamming or delay.

[0050] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. An asphalt concrete pavement compaction quality testing device, comprising a roller support (1), characterized in that: A measuring component (2) is provided on the outside of the roller support (1). The measuring component (2) includes a sensor group one (3) and a sensor group two (4). An encoder (5) is also provided between the roller support (1) and the roller of the road roller.

2. The asphalt concrete pavement compaction quality testing device according to claim 1, characterized in that: The roller support (1) includes a front end (102) and a rear end (103) of the roller frame. A roller bearing seat (101) is provided between the front end (102) and the rear end (103) of the roller frame. The roller bearing seat (101) is used to install the roller of the road roller. An encoder (5) is arranged between the roller support (1) and the roller of the road roller.

3. The asphalt concrete pavement compaction quality testing device according to claim 1, characterized in that: Sensor group 1 (3) and sensor group 2 (4) have the same structure, but the sensor numbers on sensor group 1 (3) and sensor group 2 (4) are different; Sensor group 1 (3) includes sensor bracket (301), which is symmetrically arranged at the front end (102) and rear end (103) of the cylinder frame. Multiple anti-vibration brackets (302) are provided on the sensor bracket (301). An anti-vibration slide (303) that can slide up and down is fitted on the anti-vibration bracket (302). A transverse support (304) is provided on one side of the anti-vibration slide (303). A transverse slide seat (310) that can slide is provided on the transverse support (304). A counterweight head (318) that can fall is provided below the transverse slide seat (310). A sensor is provided at the top of the counterweight head (318).

4. The asphalt concrete pavement compaction quality testing device according to claim 3, characterized in that: The sensors include sensor A1 (306), sensor A2 (307), sensor B1 (401) and sensor B2 (402). Sensor A1 (306) and sensor A2 (307) are arranged on sensor group one (3), and sensor B1 (401) and sensor B2 (402) are arranged on sensor group two (4). Sensors A1 (306), A2 (307), B1 (401) and B2 (402) are rebound sensors. Sensor group one (3) is located at the front end (102) of the cylinder frame, and sensor group two (4) is located at the rear end (103) of the cylinder frame.

5. The asphalt concrete pavement compaction quality testing device according to claim 3, characterized in that: The seismic slide (303) is provided with a guide rod (314), which is slidably connected to the seismic support (302). A spring (315) is also provided between the seismic slide (303) and the seismic support (302). The seismic bracing (302) is equipped with a tensioning electric cylinder (317) inside. The output shaft of the tensioning electric cylinder (317) is equipped with a tensioning wire (316). The tensioning electric cylinder (317) is used to lift the seismic slide (303) upward so that the seismic slide (303) is temporarily fixed against the seismic bracing (302).

6. The asphalt concrete pavement compaction quality testing device according to claim 3, characterized in that: The transverse support (304) is provided with a through transverse slide groove (308), and two transverse slide blocks (310) that can move laterally are provided in the transverse slide groove (308). Transverse guide rails (311) are also provided on both sides of the transverse slide groove (308). The transverse slide blocks (310) and the transverse guide rails (311) are slidably connected. Below the transverse slide (310) is a wire feeding bracket (305), below the wire feeding bracket (305) is a counterweight head (318), and between the counterweight head (318) and the wire feeding bracket (305) is a wire feeding lowering bracket (316). A transverse motor (309) is also provided on one side of the transverse support (304). A transverse lead screw (319) is provided at the output shaft end of the transverse motor (309). The transverse lead screw (319) passes through two transverse slides (310) that can move laterally. The rotation of the transverse lead screw (319) can drive the transverse slides (310) to slide on the transverse guide rail (311).

7. The asphalt concrete pavement compaction quality testing device according to claim 6, characterized in that: The counterweight head (318) has a cavity (320), and the lower end of the lower wire (316) has a movable buckle (321). The movable buckle (321) is movably connected to the cavity (320). The cavity (320) is used to reduce the influence of the lower wire (316) on the sensor's rebound parameters. The wire feeding bracket (305) is also equipped with a rotatable take-up roller (324). A lifting cylinder (323) is provided on one side of the take-up roller (324). A take-up motor (322) is provided at the output shaft end of the lifting cylinder (323). The lifting cylinder (323) is used to make the take-up motor (322) hold the take-up roller (324). The take-up motor (322) is used to control the rotation of the take-up roller (324). A rubber sheet is provided at the top of the output shaft of the take-up motor (322) to increase the friction between it and the take-up roller (324).

8. The method of using the asphalt concrete pavement compaction quality testing device according to any one of claims 1-7, characterized in that: The method includes: S1. Select measuring points for calibration. Stop the roller to compact the vibration. The background control tensioning cylinder (317) lifts the anti-seismic slide (303) and temporarily fixes it against the anti-seismic support (302) so that sensor group one (3) and sensor group two (4) are at the same height. S2. The background control of the transverse motor (309) drives the transverse slide (310) to keep the parameters of the rangefinder (312) on sensor group one (3) and sensor group two (4) consistent, and keep the position fixed after positioning; S3. After maintaining the same height and distance, the background control lifting cylinder (323) releases the winding roller (324). Sensors A1 (306) and A2 (307) are free-falling to measure the rebound parameters and then reset. The background compares the preset parameters and adjusts the difference to calibrate the sensors. S4. The roller compacts the measuring point once. Sensors B1 (401) and B2 (402) fall freely to measure the rebound parameters and then reset. The background compares the preset parameters and adjusts the difference to complete the sensor group calibration. S5. During the compaction process, the roller is periodically stopped at the test point, and the background control sensors A1 (306) and A2 (307) are free-falling to collect the rebound parameters of the previous compacted road surface. S6. The roller starts rolling with the free fall coordinates of sensor A1 (306) and sensor A2 (307) as anchor points. The encoder (5) records the number of rolling circles and compaction passes simultaneously. S7. According to the parameters of the encoder (5), the roller moves forward and rolls. After the sensors B1 (401) and B2 (402) move to the anchor point, the roller stops vibrating. S8. The background control sensor B1 (401) and sensor B2 (402) collect the road surface rebound parameters after the compaction and complete the reset. S9. The background compares the parameters of sensor A1 (306) and sensor A2 (307) with those of sensor B1 (401) and sensor B2 (402) before and after and the preset standard, and combines the encoder (5) pass number to determine and instruct to repress or switch to the next measurement point.

9. The method of using the asphalt concrete pavement compaction quality testing device according to claim 8, characterized in that: In steps S1-S8, the road roller maintains a stopped rolling vibration and a normally running engine while performing all detection and alignment actions; The background control system uniformly controls the tensioning electric cylinder (317), the transverse motor (309), the lifting cylinder (323), and the winding roller (324) to coordinate their actions, and sequentially complete the sensor group's height positioning, equidistant calibration, free fall detection, coordinate anchoring, rolling follow-up, alignment retesting, and intelligent judgment. Sensors A1 (306), A2 (307), B1 (401), and B2 (402) all adopt the detection method of first collecting parameters and then resetting and returning to their original positions. The rangefinder (312) is used to ensure the alignment accuracy of sensor group one (3) and sensor group two (4). The encoder (5) records the compaction data in real time and provides a basis for the movement and positioning of the road roller.

10. The method of using the asphalt concrete pavement compaction quality testing device according to claim 8, characterized in that: The method includes: after sensor group one (3) and sensor group two (4) complete the equal height and equal distance calibration, their positions are kept fixed until the calibration process of the current measuring point is completed. After the measurement stage is completed, the tensioning electric cylinder (317) releases the anti-vibration slide (303) and the anti-vibration support (302) so that the anti-vibration slide (303) and the anti-vibration support (302) can move relative to each other to reduce the impact of vibration and rolling on the sensor. During the compaction process, the drop measurement points of sensors A1 (306) and A2 (307) are used as anchor points. Sensors B1 (401) and B2 (402) move to the anchor point with the roller and then collect the parameters after compaction. The background system compares the difference in rebound parameters before and after compaction with the preset standard, and combines the number of compaction passes recorded by the encoder (5) to automatically control the roller to perform re-compaction or jump to the next measuring point operation.

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