Pavement asphalt stress absorbing layer cohesiveness detection device and detection method

Abstract

The invention relates to the technical field of pavement detection, and discloses a pavement asphalt stress absorbing layer cohesiveness detection device and a detection method.The pavement asphalt stress absorbing layer cohesiveness detection device comprises a base and a movable table arranged on the base, the movable table is driven by a linear module and moves on the base, and a clamp box capable of being separated up and down is arranged on the movable table; the cylindrical asphalt pavement sample is clamped through the clamp box, and the two ends of the cylindrical asphalt pavement sample are guided out from the two ends of the clamp box. According to the suction cup tension detection structure, the vacuum suction cups are adopted to suck the two ends of the sample for tension detection, compared with a common clamp, the vacuum suction cups can avoid the situation that an asphalt pavement material is clamped to be cracked due to the fact that the asphalt pavement material is soft, and a good fixing effect is provided. Meanwhile, the end face of the sample is polished to be flat, suction of a vacuum chuck is facilitated, it is guaranteed that the sample cannot be separated in the stretching process, and the accuracy of the detection result is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of pavement detection, and particularly to a device and method for detecting the adhesion of a pavement asphalt stress absorption layer. Background Art

[0002] In the field of road engineering, the adhesion of the pavement asphalt stress absorption layer plays a crucial role in the overall performance and service life of the road. Accurately detecting the adhesion of the asphalt stress absorption layer can provide key data support for road construction and maintenance, ensuring good stability and durability of the road during long-term use.

[0003] Conventionally, the adhesion of the pavement asphalt stress absorption layer is generally detected by a pulling method. In terms of sample fixation, when facing relatively soft asphalt pavement materials, ordinary clamps are extremely likely to directly crack the sample due to excessive clamping force. This not only destroys the integrity of the sample but also seriously affects the accuracy of the detection result and cannot truly reflect the actual adhesion performance of the asphalt pavement. The present invention provides a device and method for detecting the adhesion of a pavement asphalt stress absorption layer. Summary of the Invention

[0004] In view of the above deficiencies in the prior art, the present invention provides a device and method for detecting the adhesion of a pavement asphalt stress absorption layer, which fixes both ends of the sample through suction cups and conducts a pulling experiment.

[0005] The present invention provides the following technical solutions: A device for detecting the adhesion of a pavement asphalt stress absorption layer includes a base and a movable table arranged on the base. The movable table is driven by a linear module and moves on the base. A clamp box that can be separated up and down is arranged on the movable table, and a cylindrical asphalt pavement sample is clamped through the clamp box, and both ends of the cylindrical asphalt pavement sample are led out from both ends of the clamp box;

[0006] On the base, there are two leveling devices, two heating devices, and two suction cup tensile force detection structures on both sides of the movable table. The two ends of the cylindrical asphalt pavement sample are polished through the leveling device to make them flat, so that the suction cup tensile force detection structure adsorbs both ends of the asphalt pavement sample and pulls until the asphalt pavement sample breaks. By detecting the tensile force value, the adhesion of the asphalt pavement is judged, and the asphalt pavement sample in the clamp box is preheated through the heating device to release stress, reduce interference, and improve the accuracy of the experiment;

[0007] At the end of the base, there is a liftable L-shaped side, and a B electromagnet is installed below the top of the L-shaped side. The clamp box is separated by adsorbing the clamp box through the B electromagnet, and the suction cup tensile force detection structure takes out the asphalt pavement sample in the clamp box for detection.

[0008] Preferably, the fixture box includes a mergeable rectangular housing A and a rectangular housing B. Both ends of the rectangular housing A and the rectangular housing B are provided with ports for exporting asphalt pavement samples. Inside the rectangular housing A, there are two parallel rollers for supporting the asphalt pavement samples. Inside the rectangular housing A and the rectangular housing B, there is a magnetic attraction assembly for fastening the asphalt pavement samples. The rectangular housing A and the rectangular housing B are provided with guide posts and jacks for alignment. After the rectangular housing A and the rectangular housing B are merged by the magnetic attraction assembly, they are locked and clamped to the asphalt pavement sample.

[0009] Preferably, the diameter of the cylindrical asphalt pavement sample is smaller than the diameter of the port. When the asphalt pavement sample is placed on the two parallel rollers and does not contact the ports on the rectangular housing A and the rectangular housing B, the heating device is used to introduce hot air into the fixture box to preheat the asphalt pavement sample.

[0010] Preferably, the magnetic attraction assembly includes four A electromagnets installed on the inner sides of the rectangular housing A and the rectangular housing B. The A electromagnets are flush with the end faces of the rectangular housing A and the rectangular housing B. After the rectangular housing A and the rectangular housing B are aligned, the four A electromagnets are aligned vertically and attract each other. On the inner sides of the rectangular housing A and the rectangular housing B, there are two movable iron arc clips. Both ends of the arc clips are connected to the inside of the rectangular housing A and the rectangular housing B through spring tie rods, enabling the arc clips to move up and down inside the rectangular housing A and the rectangular housing B. When the A electromagnets are energized, the rectangular housing A and the rectangular housing B are merged, and the arc clips are attracted to the A electromagnets. In this way, the arc clips inside the rectangular housing A and the rectangular housing B jointly clamp the asphalt pavement sample.

[0011] Preferably, the leveling device includes two support platforms that slide on the base. A protective cylinder is installed on the support platforms. Inside the protective cylinder, there is a partition. A rotatable transmission shaft is provided on the partition. A grinding disc is installed on the transmission shaft. At the other end of the partition, there is a motor for driving the transmission shaft. The support platform moves back and forth under the push of the electric cylinder, enabling the protective cylinder to move to cover the end face of the asphalt pavement sample, and the end face is polished by the grinding disc to make it flat. A discharge pipe is provided at the front end of the protective cylinder, and the discharge pipe is connected to a blower inside the base, enabling the protective cylinder to generate suction to discharge the debris generated by grinding.

[0012] Preferably, the heating device includes two moving platforms that slide on the base. Heat conduction cylinders are installed on both moving platforms. The rear ends of the heat conduction cylinders are connected to both ends of a hot air blower inside the base through pipes. The moving platform moves back and forth under the push of the electric cylinder, enabling the two heat conduction cylinders to be docked with the front and rear ends of the fixture box, enabling the hot air blower to introduce hot air into the fixture box through the pipes and forming a circulation channel to continuously preheat the asphalt pavement sample.

[0013] Preferably, the heating device further includes a positioning ring installed in the heat conduction cylinder, and a plurality of groups of spring buffer rods are installed on the positioning ring. The positioning ring is connected to the porous plate through a plurality of groups of spring buffer rods, and the porous plate slides inside the heat conduction cylinder. When the two moving platforms move forward and contact both ends of the fixture box, the two porous plates are driven by the spring buffer rods to adjust the position of the asphalt pavement sample so that both ends are symmetrical.

[0014] Preferably, the suction cup tensile force detection structure includes two adjusting seats that can be lifted and moved forward and backward on the base. Fixed platforms are installed on both of the two adjusting seats. A tensile force sensor is provided inside the fixed platform, and a vacuum suction cup is installed on the tensile force sensor. The two vacuum suction cups adsorb both ends of the polished asphalt pavement sample, and then the adjusting seats move outward until the asphalt pavement sample breaks. The numerical value is detected by the tensile force sensor to judge the adhesiveness of the asphalt pavement.

[0015] Preferably, the adjusting seat includes a lifting platform provided on the base and an L-shaped platform provided on the lifting platform. A hydraulic cylinder is provided inside the L-shaped platform. A sliding platform that can slide is provided on the L-shaped platform, and the fixed platform is installed on the sliding platform. The hydraulic cylinder pushes the sliding platform to move on the L-shaped platform, thereby pulling the asphalt pavement sample for detection.

[0016] A method for detecting the adhesiveness of a pavement asphalt stress absorption layer is specifically operated as follows:

[0017] S1. Horizontally place the cylindrical asphalt pavement sample inside the fixture box, and both ends of the cylindrical asphalt pavement sample are led out from both ends of the fixture box;

[0018] S2. Then the leveling device operates to polish both ends of the asphalt pavement sample and adsorb the debris generated by the polishing to ensure that the end faces are clean;

[0019] S3. Then the linear module drives the movable platform to move the fixture box to the heating device. The heating device contacts both ends of the fixture box, and continuously conveys hot air at a set temperature into the fixture box to preheat the asphalt pavement sample, so that the internal stress is released and the experimental error is reduced;

[0020] S4. Finally, the linear module drives the movable platform to move the fixture box to the suction cup tensile force detection structure. Open the fixture box through the L-shaped side, take out and adsorb the asphalt pavement sample through the suction cup tensile force detection structure, apply a tensile force to the sample at a constant rate until the sample breaks, and real-time monitor the maximum tensile force value at the moment of fracture and transmit it to the control system as the basis for adhesiveness evaluation.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The suction cup tensile force detection structure uses vacuum suction cups to adsorb both ends of the sample for tensile force detection. Compared with ordinary fixtures, the vacuum suction cups can avoid the situation of being clamped and cracked due to the softness of asphalt pavement materials, providing a good fixing effect. At the same time, by grinding the end face of the sample to make it flat, it is convenient for the vacuum suction cups to adsorb, ensuring that the sample will not break away during the stretching process and guaranteeing the accuracy of the detection results.

[0023] (2) The heating device is connected to the fixture box, introducing hot air into the fixture box and forming a circulation channel to continuously preheat the sample. At the same time, it can also adjust the position of the sample to ensure uniform heating of the sample, effectively releasing the internal stress of the sample, reducing the residual stress concentration caused by the temperature gradient during the forming or cooling process, and reducing the risk of non-uniform fracture in the pull-out test.

[0024] (3) The fixture box is composed of a mergeable rectangular shell A and a rectangular shell B, which can clamp the sample for grinding, ensuring that the sample will not displace during the detection process, guaranteeing the stability of the detection process, and at the same time providing a place for the preheating process, avoiding sample transfer, and enabling the sample to be preheated in a closed environment to be uniformly heated. Description of the Drawings

[0025] Figure 1 Schematic diagram of the sample grinding process of the present invention;

[0026] Figure 2 Schematic diagram of the sample heating process of the present invention;

[0027] Figure 3 Schematic diagram of the sample taking-out and detection process of the present invention;

[0028] Figure 4 Schematic diagram of the structure of the fixture box of the present invention;

[0029] Figure 5 Schematic diagram of the structure of the leveling device of the present invention;

[0030] Figure 6 Of the present invention Figure 5 Schematic diagram of the internal structure;

[0031] Figure 7 Schematic diagram of the structure of the heating device of the present invention;

[0032] Figure 8 Of the present invention Figure 7 Schematic diagram of the internal structure;

[0033] Figure 9 Schematic diagram of the suction cup tensile force detection structure of the present invention.

[0034] In the figure: 1, base; 2, movable table; 3, fixture box; 4, leveling device; 5, heating device; 6, suction cup tensile force detection structure; 7, L-shaped side; 31, A rectangular shell; 32, B rectangular shell; 33, parallel rollers; 34, magnetic attraction assembly; 35, guide post; 36, jack; 37, port; 341, A electromagnet; 342, arc clamp; 343, spring pull rod; 41, support table; 42, protective cylinder; 43, partition; 44, transmission shaft; 45, grinding disc; 46, discharge pipe; 51, moving table; 52, heat conduction cylinder; 53, positioning ring; 54, spring buffer rod; 55, perforated plate; 61, adjusting seat; 62, fixed table; 63, tensile force sensor; 64, vacuum suction cup; 611, lifting table; 612, L-shaped table; 613, hydraulic cylinder; 614, sliding table. Detailed implementation manners

[0035] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present disclosure with reference to the accompanying drawings of the embodiments of the present disclosure. To keep the following description of the embodiments of the present disclosure clear and concise, the detailed descriptions of known functions and known components are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0036] Please refer to Figure 1 and Figure 2 and Figure 3 , a device for detecting the adhesiveness of a pavement asphalt stress absorption layer, mainly composed of a base 1, a movable table 2, a fixture box 3, a leveling device 4, a heating device 5, a suction cup tensile force detection structure 6, an L-shaped side 7, etc. The movable table 2 is driven by a linear module to move on the base 1, and the cylindrical asphalt pavement sample is clamped by the fixture box 3. The two ends of the sample are successively polished by the leveling device 4 and preheated by the heating device 5 to release stress. Finally, the two ends of the sample are adsorbed by the suction cup tensile force detection structure 6 and pulled until it breaks, and the adhesiveness of the asphalt pavement is judged by detecting the tensile force value. The L-shaped side 7 is used to assist in the separation of the fixture box 3 and the extraction of the sample, facilitating the extraction of the sample by the suction cup tensile force detection structure 6 for detection.

[0037] Refer to Figure 4 , the fixture box 3 is composed of a mergeable A rectangular shell 31 and a B rectangular shell 32. Two parallel rollers 33 are arranged inside the A rectangular shell 31 for supporting the asphalt pavement sample. Ports 37 are provided at both ends of the A rectangular shell 31 and the B rectangular shell 32 so that the two ends of the asphalt pavement sample can be led out therefrom. A magnetic attraction assembly 34 is installed inside the A rectangular shell 31 and the B rectangular shell 32 for fastening the sample. At the same time, a guide post 35 and a jack 36 are respectively provided on the A rectangular shell 31 and the B rectangular shell 32 for achieving precise alignment during merging.

[0038] The magnetic attraction assembly 34 includes four A electromagnets 341 installed on the inner sides of the A rectangular housing 31 and the B rectangular housing 32, and these A electromagnets 341 are flush with the end faces of the housings. When the A rectangular housing 31 and the B rectangular housing 32 are closed, the four A electromagnets 341 are aligned vertically and attract each other, thereby realizing the preliminary locking of the two housings. Therefore, the A electromagnets 341 in the A rectangular housing 31 and the B rectangular housing 32 have opposite magnetic poles so that they can attract each other and attract the arc-shaped clamp 342.

[0039] Two arc-shaped clamps 342 made of movable iron are also respectively provided on the inner sides of the A rectangular housing 31 and the B rectangular housing 32. The two ends of the arc-shaped clamp 342 are connected to the inside of the housing through a spring pull rod 343, enabling it to move up and down in the housing. After the A electromagnet 341 is powered on, the A rectangular housing 31 and the B rectangular housing 32 are combined, and the arc-shaped clamp 342 will be attracted to the A electromagnet 341. At this time, the arc-shaped clamps 342 in the A rectangular housing 31 and the B rectangular housing 32 jointly clamp the asphalt pavement sample to ensure that the sample does not shift during the detection process.

[0040] The diameter of the cylindrical asphalt pavement sample is smaller than the diameter of the port 37. When the sample is placed on the two parallel rollers 33, the sample does not contact the port 37 on the A rectangular housing 31 and the B rectangular housing 32. Such a design enables the heating device 5 to introduce hot air into the fixture box 3 to preheat the asphalt pavement sample, and the hot air can evenly surround the sample, improving the preheating effect.

[0041] Refer to Figure 5 and Figure 6 As shown in

[0042] The leveling device 4 includes two support platforms 41 that slide on the base 1. A protective cylinder 42 is installed on the support platform 41. A partition plate 43 is arranged inside the protective cylinder 42. A rotatable transmission shaft 44 is installed on the partition plate 43, and a grinding disc 45 is fixed on the transmission shaft 44. A motor for driving the transmission shaft 44 is installed at the other end of the partition plate 43. The support platform 41 moves back and forth under the push of the electric cylinder. A discharge pipe 46 is provided at the front end of the protective cylinder 42, and the discharge pipe 46 is connected to a blower inside the base 1.

[0043] Refer to Figure 7 and Figure 8, the heating device 5 includes two moving platforms 51 that slide on the base 1, and heat conduction cylinders 52 are installed on both of the two moving platforms 51. The rear end of the heat conduction cylinder 52 is connected to both ends of a hot air blower inside the base 1 through a pipeline. The moving platform 51 moves back and forth under the push of an electric cylinder. A positioning ring 53 is installed inside the heat conduction cylinder 52, and several groups of spring buffer rods 54 are installed on the positioning ring 53. The positioning ring 53 is connected to a porous plate 55 through several groups of spring buffer rods 54, and the porous plate 55 can slide inside the heat conduction cylinder 52.

[0044] When it is necessary to preheat the asphalt pavement sample, the electric cylinder pushes the moving platform 51 forward to make the two heat conduction cylinders 52 dock with the front and rear ends of the fixture box 3 respectively. At this time, the hot air blower inside the base 1 starts, and hot air is introduced into the fixture box 3 through the pipeline and forms a circulation channel to continuously preheat the asphalt pavement sample. When the two moving platforms 51 move forward and contact the two ends of the fixture box 3, since the position of the sample in the fixture box 3 is asymmetric and inconvenient for subsequent experiments, at this time, the two porous plates 55 are driven by the spring buffer rods 54 to adjust the position of the asphalt pavement sample to make its two ends symmetrical, ensuring that the sample is evenly heated, improving the preheating effect and the accuracy of subsequent detection. In addition, at this time, the A electromagnet 341 inside the fixture box 3 needs to be powered off, and the arc-shaped clamp 342 moves away from the asphalt pavement sample under the reset of the spring pull rod 343. In this way, the asphalt pavement sample falls on the two parallel rollers 33, reducing the contact area with the sample, thus increasing the contact surface of the hot air with the asphalt pavement sample, avoiding the arc-shaped clamp 342 clamping on the asphalt pavement sample, and preventing the hot air from heating the clamped part, so that the stress at this part cannot be eliminated.

[0045] Asphalt materials have significant temperature sensitivity. Preheating (such as 40 - 60 °C) can make the internal temperature distribution of the sample more uniform, reduce the residual stress concentration caused by the temperature gradient during the forming or cooling process, and thus reduce the risk of non-uniform fracture in the pull-out test.

[0046] Refer to Figure 9 , the suction cup tensile force detection structure 6 includes two adjusting seats 61 that can be lifted and moved back and forth on the base 1, and fixing platforms 62 are installed on both of the two adjusting seats 61. A tensile force sensor 63 is provided inside the fixing platform 62, and a vacuum suction cup 64 is installed on the tensile force sensor 63. The adjusting seat 61 includes a lifting platform 611 provided on the base 1 and an L-shaped platform 612 provided on the lifting platform 611. A hydraulic cylinder 613 is provided inside the L-shaped platform 612, a sliding platform 614 that can slide is provided on the L-shaped platform 612, and the fixing platform 62 is installed on the sliding platform 614.

[0047] When performing tensile testing on an asphalt pavement sample, first adjust the height of the adjusting seat 61 through the lifting platform 611 so that the vacuum suction cups 64 are in appropriate positions at both ends of the polished asphalt pavement sample. Then, start the vacuum device (not shown in the figure) so that the two vacuum suction cups 64 adsorb both ends of the sample. Next, the hydraulic cylinder 613 pushes the sliding table 614 to move outward on the L-shaped table 612, thereby pulling the asphalt pavement sample. During the pulling process, the tensile force sensor 63 detects the tensile force value in real time until the asphalt pavement sample breaks. At this time, the maximum tensile force value detected by the tensile force sensor 63 is an important basis for judging the adhesiveness of the asphalt pavement.

[0048] The two ends of the asphalt pavement are fixed by using vacuum suction cups, which is convenient for the experiment. Since the asphalt pavement material is relatively soft, ordinary clamps may directly crack it when clamping, thus affecting the test results. However, the vacuum suction cups can provide a good fixing effect. Since there are gaps due to the unevenness of the asphalt pavement, the end faces are polished flat by grinding so that the vacuum suction cups can easily adsorb, and thus will not come off during the stretching process.

[0049] At the end of the base 1, there is a liftable L-shaped side 7. Below the top of the L-shaped side 7, a B electromagnet (not shown in the figure) is installed. When it is necessary to open the fixture box 3 and take out the sample for testing, the L-shaped side 7 rises to an appropriate position, the B electromagnet is energized to adsorb the fixture box 3, so that the A rectangular shell 31 and the B rectangular shell 32 are separated. Then, the vacuum suction cups 64 of the suction cup tensile force detection structure 6 take out the asphalt pavement sample in the fixture box 3 and perform subsequent tensile force detection operations.

[0050] Specific implementation steps of a method for detecting the adhesiveness of a pavement asphalt stress absorption layer:

[0051] S1. Sample placement: Horizontally place the cylindrical asphalt pavement sample inside the fixture box 3, ensure that both ends of the sample are led out from the ports 37 at both ends of the fixture box 3, and the sample is placed on two parallel rollers 33 without contacting the ports 37, so as to prepare for the subsequent preheating operation.

[0052] S2. Sample grinding: Start the leveling device 4, the electric cylinder pushes the support table 41 to move, so that the protective cylinder 42 covers the end faces of the asphalt pavement sample, and the motor drives the grinding disc 45 to rotate to grind both ends of the sample. At the same time, the blower adsorbs and discharges the debris generated by grinding through the discharge pipe 46 to ensure that the end faces of the sample are clean and flat, providing a good basis for subsequent adsorption and tensile force detection.

[0053] S3. Sample preheating: The linear module drives the movable table 2 to move the fixture box 3 to the heating device 5. The electric cylinder pushes the movable table 51 to dock the two heat conduction cylinders 52 with both ends of the fixture box 3. The hot air blower starts to continuously deliver hot air at a set temperature into the fixture box 3 to preheat the asphalt pavement sample, release the internal stress of the sample, and reduce experimental errors. During this process, the porous plate 55 in the heat conduction cylinder 52 adjusts the position of the sample under the action of the spring buffer rod 54 to ensure uniform heating of the sample.

[0054] S4. Sample tensile force detection: The linear module drives the movable table 2 again to move the fixture box 3 to the suction cup tensile force detection structure 6. The L-shaped side 7 rises, and the B electromagnet adsorbs the fixture box 3 to separate it. The vacuum suction cups 64 of the suction cup tensile force detection structure 6 adsorb both ends of the sample, and the hydraulic cylinder 613 of the adjustment seat 61 pushes the sliding table 614 to move outward at a constant speed to apply a tensile force to the sample until the sample breaks. The tensile force sensor 63 monitors the tensile force value in real time and transmits the maximum tensile force value at the moment of fracture to the control system as the basis for evaluating the adhesion of the asphalt pavement.

[0055] The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present invention.

Claims

1. A device for detecting the adhesion of a road asphalt stress absorbing layer, characterized in that: The invention comprises a base (1) and a movable platform (2) arranged on the base (1), wherein the movable platform (2) is driven by a linear module and moves on the base (1), and the movable platform (2) is provided with a clamp box (3) which can be separated up and down, and a cylindrical asphalt pavement sample is clamped by the clamp box (3), and two ends of the cylindrical asphalt pavement sample are led out from two ends of the clamp box (3); The base (1) is provided with two leveling devices (4), two heating devices (5) and two suction cup tension detection structures (6) located on both sides of the movable platform (2). The two ends of the cylindrical asphalt pavement sample are polished by the leveling device (4) to make it smooth, so that the suction cup tension detection structure (6) adsorbs the two ends of the asphalt pavement sample and pulls until the asphalt pavement sample breaks. The adhesion of the asphalt pavement is determined by detecting the tension value, and the asphalt pavement sample in the fixture box (3) is preheated by the heating device (5) to release stress, reduce interference, and improve experimental accuracy. The end of the base (1) is provided with a liftable L-shaped side (7), and a B electromagnet is installed below the top of the L-shaped side (7). The B electromagnet adsorbs the clamp box (3) to separate the clamp box (3), and the suction cup tension detection structure (6) takes out the asphalt pavement sample in the clamp box (3) and performs detection.

2. The device for detecting adhesion of asphalt stress absorbing layer of pavement according to claim 1, characterized in that: The clamp box (3) comprises a rectangular shell A (31) and a rectangular shell B (32) that can be combined, and ports (37) for leading out asphalt pavement samples are provided at both ends of the rectangular shell A (31) and the rectangular shell B (32), two parallel rollers (33) for supporting the asphalt pavement samples are provided inside the rectangular shell A (31), a magnetic suction component (34) for fastening the asphalt pavement samples is provided inside the rectangular shell A (31) and the rectangular shell B (32), and guide posts (35) and sockets (36) for alignment are provided on the rectangular shell A (31) and the rectangular shell B (32), and the asphalt pavement samples are locked and clamped by the magnetic suction component (34) after the rectangular shell A (31) and the rectangular shell B (32) are combined.

3. The device for detecting adhesion of asphalt stress absorbing layer of pavement according to claim 2, characterized in that: The diameter of the cylindrical asphalt pavement sample is smaller than the diameter of the port (37). When the asphalt pavement sample is placed on two parallel rollers (33), and the asphalt pavement sample does not contact the ports (37) on the A rectangular shell (31) and the B rectangular shell (32), the heating device (5) introduces hot air into the fixture box (3) to preheat the asphalt pavement sample.

4. The device for detecting adhesion of asphalt stress absorbing layer of pavement according to claim 2, characterized in that: The magnetic attraction assembly (34) comprises four A electromagnets (341) installed inside the A rectangular shell (31) and the B rectangular shell (32), and the A electromagnets (341) are all flush with the end surfaces of the A rectangular shell (31) and the B rectangular shell (32), so that after the A rectangular shell (31) and the B rectangular shell (32) are matched, the four A electromagnets (341) are aligned up and down and adsorbed to each other, and two movable iron arc clamps (342) are provided inside the A rectangular shell (31) and the B rectangular shell (32), and the arc clamps (342) are Both ends are connected to the inside of the A rectangular shell (31) and the B rectangular shell (32) through a spring pull rod (343), so that the arc clamp (342) moves up and down in the A rectangular shell (31) and the B rectangular shell (32). When the A electromagnet (341) is energized, the A rectangular shell (31) and the B rectangular shell (32) are merged, and the arc clamp (342) is adsorbed on the A electromagnet (341), so that the arc clamp (342) in the A rectangular shell (31) and the B rectangular shell (32) clamps the asphalt pavement sample together.

5. The device for detecting adhesion of asphalt stress absorbing layer of pavement according to claim 1, characterized in that: The leveling device (4) comprises two support platforms (41) sliding on the base (1), and a protective tube (42) is installed on the support platform (41), a partition (43) is installed inside the protective tube (42), and a rotatable transmission shaft (44) is provided on the partition (43), and a grinding disc (45) is installed on the transmission shaft (44), and a motor for driving the transmission shaft (44) is installed at the other end of the partition (43). The support platform (41) moves forward and backward under the push of the electric cylinder, so that the protective tube (42) moves to cover the end face of the asphalt pavement sample, and grinds the end face of the asphalt pavement sample by the grinding disc (45) to make it flat, and a discharge pipe (46) is provided at the front end of the protective tube (42), and the discharge pipe (46) is connected to the fan inside the base (1), so that the protective tube (42) generates suction to discharge the debris generated by grinding.

6. The device for detecting adhesion of asphalt stress absorbing layer of pavement according to claim 1, characterized in that: The heating device (5) comprises two movable platforms (51) sliding on a base (1), and a heat-conducting tube (52) is installed on each of the two movable platforms (51). The rear end of the heat-conducting tube (52) is connected to the two ends of a hot air blower inside the base (1) through a pipeline. The movable platform (51) moves forward and backward under the push of an electric cylinder, so that the two heat-conducting tubes (52) are docked with the front and rear ends of a fixture box (3), so that the hot air blower guides hot air into the fixture box (3) through the pipeline, and forms a circulation channel, so as to continuously preheat the asphalt pavement sample.

7. The device for detecting adhesion of asphalt stress absorbing layer of pavement according to claim 6, characterized in that: The heating device (5) further comprises a positioning ring (53) installed in the heat-conducting cylinder (52), and a plurality of groups of spring buffer rods (54) are installed on the positioning ring (53), the positioning ring (53) is connected to the porous plate (55) through the plurality of groups of spring buffer rods (54), and the porous plate (55) slides on the inner side of the heat-conducting cylinder (52), and when the two moving platforms (51) move forward and contact the two ends of the fixture box (3), the two porous plates (55) are driven by the spring buffer rods (54) to adjust the position of the asphalt pavement sample so that the two ends are symmetrical.

8. The device for detecting adhesion of asphalt stress absorbing layer of pavement according to claim 1, characterized in that: The suction cup tension detection structure (6) comprises two adjustment seats (61) on a base (1) which can be raised and lowered and moved forward and backward. A fixed platform (62) is installed on each of the two adjustment seats (61). A tension sensor (63) is provided inside the fixed platform (62), and a vacuum suction cup (64) is installed on the tension sensor (63). The two vacuum suction cups (64) adsorb the two ends of the polished asphalt pavement sample and then move outward through the adjustment seats (61) until the asphalt pavement sample breaks. The tension sensor (63) detects a value to determine the adhesion of the asphalt pavement.

9. The device for detecting adhesion of asphalt stress absorbing layer of pavement according to claim 1, characterized in that: The adjustment seat (61) comprises a lifting platform (611) arranged on a base (1) and an L-shaped platform (612) arranged on the lifting platform (611); a hydraulic cylinder (613) is arranged inside the L-shaped platform (612); a slidable slide (614) is arranged on the L-shaped platform (612); and the fixed platform (62) is mounted on the slide (614); the slide (614) is pushed to move on the L-shaped platform (612) by the hydraulic cylinder (613), thereby pulling an asphalt pavement sample for testing.

10. A method for detecting the adhesion of a pavement asphalt stress absorbing layer, characterized in that: The device for detecting adhesion of asphalt stress absorption layer of a pavement according to any one of claims 1 to 9 is used, and the specific operation is as follows: S1, placing the cylindrical asphalt pavement sample horizontally inside the fixture box (3), and leading both ends of the cylindrical asphalt pavement sample out from both ends of the fixture box (3); S2, then the leveling device (4) is operated to grind both ends of the asphalt pavement sample and absorb the debris generated by grinding to ensure that the end surface is clean; S3, the linear module then drives the movable table (2) to move the fixture box (3) to the heating device (5), and the heating device (5) contacts both ends of the fixture box (3), so that hot air of a set temperature is continuously delivered into the fixture box (3), so as to preheat the asphalt pavement sample, release the internal stress, and reduce the experimental error; S4. Finally, the linear module drives the movable table (2) to move the fixture box (3) to the suction cup tension detection structure (6), and the fixture box (3) is opened through the L-shaped side (7). The asphalt pavement sample is taken out and adsorbed through the suction cup tension detection structure (6), and a tensile force is applied to the sample at a constant rate until the sample breaks. The maximum tension value at the moment of breaking is monitored in real time and transmitted to the control system as a basis for evaluating adhesion.

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