Asphalt mixture and tire interactive loading type rolling resistance accurate testing device and testing method thereof

Abstract

The invention relates to the technical field of road testing, in particular to an asphalt mixture and tire interactive loading type rolling resistance accurate testing device and a testing method thereof. The method specifically comprises the following steps: step 1, determining a loading load of a loading assembly, a rotating speed of a torque control assembly, and test parameters of asphalt mixture test pieces and test tires of corresponding types; 2, adjusting equipment according to a measurement mode according to a measurement requirement, wherein the measurement mode is divided into an overall rolling resistance test and a local rolling resistance test; 3, acquiring image data and test data after the asphalt mixture test piece and the test tire are tested, calculating rolling resistance, and obtaining final rolling resistance test data through an overall rolling resistance test and a local rolling resistance test; the resistance testing device has the beneficial effects that the resistance of the asphalt mixture test piece and the rolling resistance testing assembly can be measured, so that the error of the resistance coefficient between the tested tire and the asphalt mixture test piece obtained through measurement is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of road testing, and more specifically, to an interactive loading type rolling resistance precise testing device for asphalt mixture and tire and a testing method thereof. Background Art

[0002] The primary task of a tire is to ensure a firm contact force, i.e., adhesion, between the vehicle and the ground. For the evaluation of tire adhesion, generally two major steps are followed: "laboratory precision analysis testing" and "field vehicle driving testing". In the laboratory stage, researchers will use sophisticated facilities such as drum rollers and professional test vehicles to simulate the actual road environment for testing. During this process, the operating environment of the tire is strictly controlled to obtain accurate data under near-ideal conditions. The implementation of this stage not only relies on high-precision testing devices but also requires complex algorithm programs for data analysis.

[0003] Tire rolling resistance is an important dimension for measuring its adhesion. When a vehicle is moving, it will encounter various resistances such as air resistance, rolling resistance, acceleration resistance, and gradient resistance. Among them, reducing rolling resistance is crucial for fuel saving and emission reduction, and it is also a key link in achieving green and low-carbon development in the transportation field. Rolling resistance is mainly generated by the friction between the wheel and the ground. Therefore, it is possible to reduce rolling resistance by improving tire materials and road surface materials. As a widely used road surface type, asphalt pavement is paved with asphalt mixture. In order to develop road surface materials with low rolling resistance, laboratories are committed to developing low-rolling resistance asphalt mixtures. Therefore, under laboratory conditions, testing the rolling resistance between the tire and the asphalt mixture is a basic step in exploring how to reduce the rolling resistance between the tire and the road surface;

[0004] However, during the testing process of most existing testing devices, the resistance between the rolling resistance asphalt mixture specimen and its limiting part during the operation of the measured tire and the rolling resistance asphalt mixture specimen is ignored, resulting in a large error in the finally measured value. Currently, there is a lack of a processing method that can accurately obtain the resistance between the rolling resistance asphalt mixture specimen and its limiting part. Summary of the Invention

[0005] The purpose of the present invention is to provide an interactive loading type rolling resistance precise testing device for asphalt mixture and tire and a testing method thereof, which can reduce the error of the resistance coefficient between the tested tire and the asphalt mixture specimen obtained by measurement.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] An accurate test device for the interactive loading rolling resistance of asphalt mixture and tire, comprising a support frame, a loading component, a torque control component, an asphalt mixture specimen, a rolling resistance test component and a test tire. The loading component, the torque control component and the rolling resistance test component are sequentially arranged on the support frame from top to bottom. The test tire is arranged at the bottom of the torque control component. The loading component is connected to the test tire through the torque control component. The asphalt mixture specimen is directly below the test tire. The asphalt mixture specimen is arranged on the rolling resistance test component. The top of the asphalt mixture specimen is cooperatively arranged with the test tire.

[0008] The rolling resistance test component includes an upper bracket, a lower bracket, a driving motor and a torque sensor. The upper bracket is slidably connected to the lower bracket. The output shaft of the driving motor is arranged on the lower bracket. The torque sensor is connected to the output shaft of the driving motor. The lower bracket is fixedly connected to the support frame. The asphalt mixture specimen is arranged between the upper bracket and the lower bracket.

[0009] As a preferred solution: The upper bracket includes an upper drag bar, a guide hole and an upper support shaft. There are two upper support shafts, which are arranged in parallel between the two upper drag bars. The two ends of each upper support shaft are respectively rotatably connected between the two upper drag bars. Two guide holes are machined on each upper drag bar, and each guide hole is arranged near the end of the upper drag bar.

[0010] As a preferred solution: The lower bracket includes two lower bracket support plates, two lower support shafts, two outward protruding adjustment bolts, two bolt balls and four bracket guide columns. The four bracket guide columns are arranged vertically in parallel. Two bracket guide columns are fixedly connected to each lower bracket support plate. The two lower support shafts are both rotatably connected between the two lower bracket support plates. One of the two lower support shafts is fixedly connected to the output shaft of the driving motor. The asphalt mixture specimen is arranged between the two lower support shafts and the two upper support shafts. One outward protruding adjustment bolt is threadedly connected to each lower bracket support plate. One bolt ball is rotatably connected to the end of each outward protruding adjustment bolt. The guide holes and the bracket guide columns are arranged in one-to-one correspondence. Each bracket guide column is slidably connected in the corresponding guide hole. The two lower support shafts are arranged horizontally in parallel. One lower support shaft is correspondingly arranged below each bracket roller, and the axial direction of each bracket roller is the same as the axial direction of its corresponding lower support shaft.

[0011] As a preferred solution: The support frame includes a bottom plate, guide columns and a top plate. There are multiple guide columns. The bottom plate is fixedly connected to the lower sides of the multiple guide columns. The bottom end of the top plate is fixedly connected to the multiple guide columns. The top plate and the bottom plate are arranged vertically in parallel. The multiple guide columns are respectively located at the four corners of the top plate and the bottom plate.

[0012] As a preferred solution: The loading component includes a first slide plate, a second slide plate, bearing sleeves, a lead screw, a nut, an outer sleeve, a gravity sensor and a spring. There are multiple bearing sleeves and springs. A plurality of bearing sleeves are fixedly connected to the first slide plate, and a plurality of bearing sleeves are fixedly connected to the second slide plate. Two bearing sleeves are sleeved on each guide post, and a spring is sleeved on each guide post. The spring is located between the two bearing sleeves. One end of the lead screw passes through the top plate and is connected to the nut. An outer sleeve is arranged between the nut and the lead screw. The outer sleeve passes through the lead screw and is sleeved outside the nut. The other end of the lead screw is provided with a gravity sensor. The bottom of the gravity sensor abuts against the second slide plate, and the bottom of the first slide plate abuts against the torque control component.

[0013] As a preferred solution: The torque control component includes an upper plate of the tire rack, side plates, a motor connection sleeve, a tire shaft, a tire shaft sleeve, bearings, a first gland, a second gland, a motor, a sensor, a sensor outer sleeve and a motor connection sleeve. The two ends of the upper plate of the tire rack are respectively fixedly connected to the two side plates. The upper end of the upper plate of the tire rack abuts against the first slide plate. The first gland is fixedly connected to the left side plate. The tire shaft is arranged between the two side plates. Each end of the tire shaft is connected to the adjacent side plate through a bearing. The first gland and the second gland are respectively fixedly connected to the two side plates. The sensor is arranged on the tire shaft. The tire shaft sleeve is arranged on the tire shaft. A sensor outer sleeve is arranged outside the sensor. The sensor outer sleeve is fixedly connected to the motor connection sleeve. The motor is fixedly connected to the motor connection sleeve. The test tire is sleeved on the tire shaft sleeve, the sensor is sleeved on the output shaft of the motor, and the output shaft of the motor is fixedly connected to the tire shaft.

[0014] An accurate test method for the rolling resistance of asphalt mixture and tire interaction loading is realized by using the above-mentioned accurate test device for the rolling resistance of asphalt mixture and tire interaction loading. The accurate test method for the rolling resistance of asphalt mixture and tire interaction loading is realized through the following steps:

[0015] Step 1: Determine the loading load of the loading component, the rotation speed of the torque control component, and the test parameters of the asphalt mixture specimen and the test tire of the corresponding type.

[0016] Step 2: Adjust the equipment according to the measurement requirements. The measurement methods are divided into: overall rolling resistance test and local rolling resistance test.

[0017] Step 3: Obtain the image data and test data after the test of the asphalt mixture specimen and the test tire, calculate the rolling resistance. The difference between the torque values obtained through the overall rolling resistance test and the local rolling resistance test is used as the accurate torque value between the asphalt mixture specimen and the test tire. Divide the accurate torque value by the product of the tire radius and the experimental load, and the obtained value is the rolling resistance coefficient between the asphalt mixture specimen and the test tire.

[0018] As a preferred solution: In step two, the process of the overall rolling resistance test is as follows: Assemble the test tire with the torque control component, install the asphalt mixture specimen in the rolling resistance test component, make the test tire contact with the asphalt mixture specimen, adjust the loading component to move the test tire downward until it contacts the asphalt mixture specimen, until the contact pressure is between 0 - 200 kg, then drive the test tire to rotate through the torque control component at a rotational speed of 100 r / min, and record the torque value; For the local rolling resistance test: Adjust the loading component to rise, so that there is a certain distance between the test tire and the rolling resistance test component, add a square wood between the test tire and the rolling resistance test component to play a separating role, start the drive motor to make the lower support shaft connected to it rotate until the rotational speed reaches 1000 r / min, and record the torque value when the reading of the torque sensor is stable.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The test tire is installed on the torque control component of the present invention, and the asphalt mixture specimen is installed between the rolling resistance test components. By controlling the movement of the loading component, driving the torque control component to move downward, the installed test tire moves downward until it contacts the asphalt mixture specimen. Then, by starting the torque control component to make the test tire rotate, the torque value for driving the test tire to rotate can be obtained through the torque control component, and the rolling resistance test component can effectively protect the asphalt mixture specimen at multiple positions during the test.

[0021] 2. The present invention can measure the torque value during the process of the asphalt mixture specimen rotating alone by using the rolling resistance test component. According to the difference between the torque values measured twice, the torque values during the test of the asphalt mixture specimen and the rolling resistance test component can be corrected for errors, improving the accuracy of the measurement results. Description of the Drawings

[0022] The following further describes the present invention in detail with reference to the drawings and specific implementation equipment.

[0023] Figure 1 is the overall structural schematic diagram of the present invention;

[0024] Figure 2 is the overall structure schematic of the present invention Figure 2 ;

[0025] Figure 3 is the overall structure schematic of the present invention Figure 3 ;

[0026] Figure 4 is the structural schematic of the rolling resistance test component of the present invention Figure 1 ;

[0027] Figure 5Schematic structure of the rolling resistance test component of the present invention Figure 2 ;

[0028] Figure 6 Schematic diagram of the upper bracket structure of the present invention;

[0029] Figure 7 Schematic diagram of the tire shaft structure of the present invention;

[0030] Figure 8 Schematic diagram of the connection between the nut and the outer sleeve of the present invention;

[0031] Figure 9 Rolling resistance coefficient values of different gradations in the test of the present invention.

[0032] In the figure: support frame 1; loading component 2; torque control component 3; asphalt mixture specimen 4; rolling resistance test component 5; test tire 6; bottom plate 11; guide post 12; top plate 13; first slide plate 21; second slide plate 22; bearing sleeve 23; lead screw 24; nut 25; outer sleeve 26; gravity sensor 27; spring 28; upper plate of the tire rack 31; side plate 32; motor connection sleeve 33; tire shaft 34; tire shaft sleeve 35; bearing 36; first gland 37; second gland 38; motor 39; sensor 310; sensor outer sleeve 311; upper bracket 51; lower bracket 52; drive motor 53; torque sensor 54; upper drag bar 511; guide hole 512; upper support shaft 513; drag frame guide post 521; lower bracket support plate 522; lower support shaft 523; externally protruding adjustment bolt 524; bolt ball 525. Specific implementation mode

[0033] Specific implementation mode 1: In combination with Figures 1 to 9 Describe this implementation mode. In this implementation mode, the asphalt mixture and tire interactive loading type rolling resistance precise test device includes a support frame 1, a loading component 2, a torque control component 3, an asphalt mixture specimen 4, a rolling resistance test component 5 and a test tire 6. The loading component 2 is arranged on the upper side of the support frame 1, the torque control component 3 is arranged in the middle of the support frame 1, the torque control component 3 is used to drive the test tire 6, the loading component 2 is in contact with the test tire 6, the test tire 6 is detachably arranged on the torque control component 3, the asphalt mixture specimen 4 is in contact with the test tire 6, the asphalt mixture specimen 4 is rotatably connected in the rolling resistance test component 5, and the rolling resistance test component 5 is arranged at the bottom of the support frame 1;

[0034] During use, a test tire 6 is installed on the torque control assembly 3, and an asphalt mixture specimen 4 is installed between the rolling resistance test assemblies 5. By controlling the movement of the loading assembly 2, the torque control assembly 3 is driven to move downward, causing the test tire 6 to move downward until it contacts the asphalt mixture specimen 4. Then, by starting the torque control assembly 3, the test tire 6 rotates. The torque value for driving the rotation of the test tire 6 can be obtained through the torque control assembly 3. The rolling resistance test assembly 5 can effectively provide a full-position protective support effect for the asphalt mixture specimen 4 in all directions during the test. At the same time, the rolling resistance test assembly 5 can also measure the torque value during the process of the asphalt mixture specimen 4 rotating alone. Based on the difference between the two measured torque values, the torque values during the test of the asphalt mixture specimen 4 and the rolling resistance test assembly 5 can be corrected for errors.

[0035] Specific Embodiment 2: This embodiment is a further limitation of Specific Embodiment 1. In this embodiment, the rolling resistance test assembly 5 includes an upper bracket 51, a lower bracket 52, a driving motor 53, and a torque sensor 54. The upper bracket 51 is slidably connected to the lower bracket 52. The output shaft of the driving motor 53 is disposed on the lower bracket 52, and the torque sensor 54 is disposed on the output shaft of the driving motor 53. The lower bracket 52 is fixedly connected to the support frame 1, and the asphalt mixture specimen 4 is disposed between the upper bracket 51 and the lower bracket 52.

[0036] The upper bracket 51 slides on the lower bracket 52, and the upper bracket 51 can slide out of the lower bracket 52. By sliding the upper bracket 51 out of the lower bracket 52, placing the asphalt mixture specimen 4 on the lower bracket 52, and then sliding the upper bracket 51 into the lower bracket 52, the asphalt mixture specimen 4 can be clamped, effectively restricting and protecting the asphalt mixture specimen 4 during the test. At the same time, through the settings of the driving motor 53 and the torque sensor 54, the ability to actively drive the asphalt mixture specimen 4 can be provided for the lower bracket 52, and the torque value when driving the rotation of the asphalt mixture specimen 4 can be obtained through the torque sensor 54.

[0037] Specific Embodiment 3: This embodiment is a further limitation of Specific Embodiment 1 or 2. In this embodiment, the upper bracket 51 includes upper drag rods 511, guide holes 512, and upper support shafts 513. There are two upper support shafts 513, and the two ends of the two upper support shafts 513 are respectively rotatably connected to the two upper drag rods 511. Two guide holes 512 are provided on each upper drag rod 511. The upper support shafts 513 can rotate as needed and are connected to the upper drag rods 511 through the upper support shafts 513 by bearings 36 to reduce friction. The guide holes 512 can provide a guiding function for the movement of the upper bracket 51.

[0038] Embodiment 4: This embodiment is a further limitation of Embodiment 1, 2 or 3. In this embodiment, the lower bracket 52 includes a bracket guide post 521, a lower bracket support plate 522, a lower support shaft 523, an outward convex adjustment bolt 524 and a bolt ball 525. The bracket guide post 521 is fixedly connected to the two lower bracket support plates 522. Both of the two lower support shafts 523 are rotatably connected between the two lower bracket support plates 522. One of the two lower support shafts 523 is fixedly connected to the output shaft of the drive motor 53. The asphalt mixture specimen 4 is arranged between the two lower support shafts 523 and the two upper support shafts 513. The two outward convex adjustment bolts 524 are respectively threadedly connected to the two lower bracket support plates 522. Bolt balls 525 are rotatably connected to the ends of the two outward convex adjustment bolts 524. The two bolt balls 525 are used to reduce the friction of the asphalt mixture specimen 4 during operation. The multiple guide holes 512 are respectively slidably connected to the multiple bracket guide posts 521. The axes of the two lower support shafts 523 and the two upper support shafts 513 are parallel to each other, forming a four-axis lifting and clamping support structure form;

[0039] Since the axes of the two lower support shafts 523 and the two upper support shafts 513 are parallel to each other, the asphalt mixture specimen 4 can perform follow-up rotation under the clamping of the two lower support shafts 523 and the two upper support shafts 513. When performing the local rolling resistance test, by starting the drive motor 53, the lower support shaft 523 connected thereto is driven to rotate, so that the asphalt mixture specimen 4 between the two lower support shafts 523 and the two upper support shafts 513 rotates. The torque sensor 54 is used to read the torque value, complete the local rolling resistance test, and then reduce the measurement parameter error between the asphalt mixture specimen 4 and the test tire 6.

[0040] Embodiment 5: This embodiment is a further limitation of Embodiment 1, 2, 3 or 4. In this embodiment, the support frame 1 includes a bottom plate 11, guide posts 12 and a top plate 13. The bottom plate 11 is fixedly connected to the lower sides of the multiple guide posts 12. There are multiple guide posts 12. The top plate 13 is fixedly connected to the multiple guide posts 12. The top plate 13 and the bottom plate 11 are arranged in parallel in the vertical direction. The multiple guide posts 12 are four guide posts 12, and the four guide posts 12 are respectively located at the four corners of the top plate 13 and the bottom plate 11. The four guide posts 12 cooperate to guide the movement path of the loading assembly 2.

[0041] Embodiment Six: This embodiment is a further limitation of Embodiment One, Two, Three, Four or Five. In this embodiment, the loading component 2 includes a first slide plate 21, a second slide plate 22, a bearing sleeve 23, a lead screw 24, a lead nut 25, an outer sleeve 26, a gravity sensor 27 and a spring 28. A plurality of bearing sleeves 23 and springs 28 are provided. A plurality of bearing sleeves 23 are fixedly connected to the first slide plate 21, and a plurality of bearing sleeves 23 are fixedly connected to the second slide plate 22. Two bearing sleeves 23 are respectively sleeved on each guide post 12, and a spring 28 is sleeved on each guide post 12. The spring 28 is located between the two bearing sleeves 23. One end of the lead screw 24 passes through the top plate 13 and is connected to the lead nut 25. An outer sleeve 26 is arranged between the lead nut 25 and the lead screw 24. The outer sleeve 26 passes through the lead screw 24 and is sleeved outside the lead nut 25. The other end of the lead screw 24 is provided with a gravity sensor 27. The bottom of the gravity sensor 27 abuts against the second slide plate 22. The bottom of the first slide plate 21 abuts against the torque control component 3. The lead screw 24 is fixedly connected to the output shaft of an external driving mechanism, such as a motor 39. The lead screw 24 is rotatably connected to the gravity sensor 27, and the gravity sensor 27 is fixedly connected to the second slide plate 22;

[0042] The process of loading the test tire 6 by the loading component 2 is as follows: By starting the external driving motor 53, the lead screw 24 is rotated counterclockwise. Under the push of the thread, the first slide plate 21 and the second slide plate 22 move downward, providing pressure on the torque control component 3, so that the torque control component 3 drives the test tire 6 to move downward. Then, the gravity sensor 27 is read. During the downward movement, the reading of the gravity sensor 27 is 100 kg, completing the setting of the test state;

[0043] During the downward movement, the spring 28 is compressed, providing a function of transmitting force, and also enabling the first slide plate 21 and the second slide plate 22 to have a follow-up ability when adjusting the lead screw 24. The positions of the lead nut 25 and the top plate 13 are fixed, and the first slide plate 21 and the second slide plate 22 can be moved by adjusting the lead screw 24.

[0044] Embodiment VII: This embodiment is a further limitation of Embodiment I, II, III, IV, V or VI. In this embodiment, the torque control assembly 3 includes an upper tire rack plate 31, side plates 32, a motor connection sleeve 33, a tire shaft 34, a tire shaft sleeve 35, bearings 36, a first gland 37, a second gland 38, a motor 39, a sensor 310 and a sensor outer sleeve 311. The left and right sides of the upper tire rack plate 31 are respectively fixedly connected to the two side plates 32. The upper tire rack plate 31 abuts against the first slide plate 21. The first gland 37 is fixedly connected to the left side plate 32. The tire shaft 34 is connected to the two side plates 32 through the bearings 36. The first gland 37 and the second gland 38 are respectively fixedly connected to the two side plates 32. The sensor 310 is arranged on the tire shaft 34. The tire shaft sleeve 35 is arranged on the tire shaft 34. The sensor outer sleeve 311 is arranged outside the sensor 310. The sensor outer sleeve 311 is fixedly connected to the motor connection sleeve 33. The motor 39 is fixedly connected to the motor connection sleeve 33. The test tire 6 is sleeved on the tire shaft sleeve 35. The sensor 310 is sleeved on the output shaft of the motor 39. The output shaft of the motor 39 is fixedly connected to the tire shaft 34;

[0045] During the test, the test tire 6 selected according to the test requirements is sleeved on the tire shaft sleeve 35. Then, the torque control assembly 3 is moved directly below the loading assembly 2 so that the axis of the test tire 6 and the asphalt mixture specimen 4 are in the same vertical plane. Then, the loading assembly 2 is moved downward to apply pressure to the test tire 6 so that the reading of the sensor 310 is 100 kg. At this time, the experiment is in the best state. Then, the motor 39 is started to rotate the tire shaft 34 until the rotation speed of the test tire 6 is 100 r / min. Then, the test can be carried out. Both the first gland 37 and the second gland 38 are used to protect the tire shaft 34.

[0046] Embodiment VIII: This embodiment is a further limitation of Embodiment I, II, III, IV, V, VI or VII. In this embodiment, the precise test method for the interactive loading rolling resistance of asphalt mixture and tire is realized by using the precise test device for the interactive loading rolling resistance of asphalt mixture and tire, and is specifically realized through the following steps:

[0047] Step 1: Determine the loading load of the loading assembly 2, the rotation speed of the torque control assembly 3, and the test parameters of the asphalt mixture specimen 4 and the test tire 6 of the corresponding type;

[0048] Step 2: Adjust the equipment according to the measurement requirements. The measurement methods are divided into: overall rolling resistance test and local rolling resistance test;

[0049] Step 3: Obtain the image data and test data of the asphalt mixture specimen 4 and the test tire 6 after the test, calculate the rolling resistance. The difference between the torque values obtained from the overall rolling resistance test and the local rolling resistance test respectively is the accurate torque value between the asphalt mixture specimen 4 and the test tire 6. Dividing this value by the product of the tire radius and the experimental load can obtain the rolling resistance coefficient between the asphalt mixture specimen 4 and the test tire 6.

[0050] Specific Embodiment 9: This embodiment is a further limitation of Specific Embodiments 1, 2, 3, 4, 5, 6, 7, 8 or 9. In this embodiment, according to the accurate test method for the interactive loading rolling resistance of asphalt mixture and tire, in the overall rolling resistance test in Step 2: Assemble the torque control component 3 with the test tire 6, install the asphalt mixture specimen 4 in the rolling resistance test component 5, make the test tire 6 contact with the asphalt mixture specimen 4, adjust the loading component 2 to make the test tire 6 move downward until it contacts the asphalt mixture specimen 4 until the contact pressure is between 0 - 200 kg. Then drive the test tire 6 to rotate through the torque control component 3 at a rotational speed of 100 r / min and record the torque value; For the local rolling resistance test: Adjust the loading component 2 to rise so that there is a certain distance between the test tire 6 and the rolling resistance test component 5. Add a square wood between the test tire 6 and the rolling resistance test component 5 to play a separating role. The wood square will not contact the specimen, which separates the tire and the specimen, so that the specimen cannot contact the tire during the second rotation, and the measured resistance is the resistance between the specimen and the bracket. The loading force is the same as that in the first experiment, and the force is transmitted to the upper bracket 51 through the square wood. Start the driving motor 53 to make the lower support shaft 523 connected to it rotate until the rotational speed is 1000 r / min. Calculate this value according to the ratio of the driving wheel to the tire radius, so that the speed of the specimen can be kept the same as that in the first time. Record the torque value when the reading of the torque sensor 54 is stable; It is also possible to turn off the driving motor 53, rotate the upper reaction frame clockwise to raise the test tire 6, remove the upper bracket 51, and remove the asphalt mixture specimen 4. Replace it with other asphalt mixture specimens 4 and repeat the above operations for testing.

[0051] The working principle of the present invention is:

[0052] By sliding the upper bracket 51 out of the lower bracket 52, placing the asphalt mixture specimen 4 on the lower bracket 52, and then sliding the upper bracket 51 into the lower bracket 52, the asphalt mixture specimen 4 can be clamped, effectively restricting and protecting the asphalt mixture specimen 4 during the test. At the same time, through the setting of the driving motor 53 and the torque sensor 54, the ability to actively drive the asphalt mixture specimen 4 can be provided for the lower bracket 52, and the torque value when driving the asphalt mixture specimen 4 to rotate can be measured by the torque sensor 54. With the axes of the two lower support shafts 523 and the two upper support shafts 513 being parallel to each other, a four-axis dynamic clamping and supporting effect is formed, enabling the asphalt mixture specimen 4 to rotate adaptively as needed under the clamping of the two lower support shafts 523 and the two upper support shafts 513. When conducting the local rolling resistance test, by starting the driving motor 53, the connected lower support shaft 523 is driven to rotate, thereby causing the asphalt mixture specimen 4 between the two lower support shafts 523 and the two upper support shafts 513 to rotate. The torque value is read by the torque sensor 54 to complete the local rolling resistance test, and then the error of the measurement parameters between the asphalt mixture specimen 4 and the test tire 6 is reduced, the error value is lowered, and the accuracy of data acquisition is improved. The process of loading the test tire 6 by the loading component 2 is as follows: By starting the driving motor 53 connected to the lead screw 24, the lead screw 24 is rotated counterclockwise. Under the push of the thread, the first slide plate 21 and the second slide plate 22 move downward, applying pressure to the torque control component 3, causing the torque control component 3 to drive the test tire 6 downward. Then, the gravity sensor 27 is read. During the downward movement, the reading of the gravity sensor 27 is 100 kg, completing the setting of the test state. During the test, the test tire 6 selected according to the test requirements is sleeved on the tire bushing 35, and then the torque control component 3 is moved directly below the loading component 2 so that the axes of the test tire 6 and the asphalt mixture specimen 4 are in the same vertical plane. Then, the loading component 2 moves downward to apply pressure to the test tire 6, causing the reading of the sensor 310 to be 100 kg. At this time, the experiment is in the best state. Then, by starting the motor 39, the tire shaft 34 is rotated until the rotation speed of the test tire 6 reaches 100 r / min, and then the test can be carried out. The first gland 37 and the second gland 38 are both used to protect the tire shaft 34.

[0053] The process of obtaining accurate data through the interactive loading rolling resistance test of asphalt mixture and tire in the present invention is as follows:

[0054] In order to explore the influence of the nominal maximum particle size of SMA asphalt mixture on the tire-road rolling resistance, the present invention uses the method of controlling a single variable for the experiment. Keeping the asphalt type as SBS modified asphalt and the asphalt content as 5% unchanged, three types of gradations, namely SMA10, SMA8, and SMA5, are selected respectively to prepare gyratory compaction specimens and conduct rolling resistance tests. Among them, three gyratory compaction specimens are prepared for each gradation for rolling resistance tests. The radius R of the tire of the rolling resistance test device is 0.28 m, and the pressure borne by the specimen is uniformly set to 100 kg. The corresponding test results are as follows:

[0055]

[0056]

[0057] The rolling resistance value and the rolling resistance coefficient are calculated based on the measured torque value and are compared and analyzed. The analysis results are as follows:

[0058]

[0059] It can be seen from the rolling resistance coefficients of different gradations that as the nominal maximum particle size of the gradation decreases, the rolling resistance and the rolling resistance coefficient between the test tire 6 and the asphalt mixture specimen 4 also gradually decrease. When the nominal maximum particle size decreases from 9.5 mm to 8 mm, the corresponding rolling resistance coefficient drops from 0.0381 to 0.0362, and the rolling resistance coefficient of SMA8 is about 4.99% lower than that of SMA10. When the nominal maximum particle size decreases from 8 mm to 4.75 mm, the corresponding rolling resistance coefficient drops from 0.0362 to 0.0338, and the rolling resistance coefficient of SMA5 is about 6.63% lower than that of SMA8, and the rolling resistance coefficient of SMA5 is about 11.29% lower than that of SMA10. The results prove that by optimizing the SMA gradation, the rolling resistance coefficient between the tire 6 and the road can be accurately measured;

[0060] 20% of the energy consumption of each vehicle during driving is used to overcome the tire rolling resistance. For every 10% reduction in rolling resistance, the energy consumption will be reduced by 2%. Reducing the rolling resistance between the test tire 6 and the road is beneficial to reducing the energy consumption of road traffic. The obtained quantitative data is conducive to adapting to and guiding the acquisition process of on-site quantitative data as needed.

Claims

1. An accurate test device for the rolling resistance of asphalt mixture and tire under interactive loading, characterized in that: It includes a support frame (1), a loading component (2), a torque control component (3), an asphalt mixture specimen (4), a rolling resistance test component (5) and a test tire (6). The loading component (2), the torque control component (3) and the rolling resistance test component (5) are arranged on the support frame (1) in sequence from top to bottom. The test tire (6) is arranged at the bottom of the torque control component (3). The loading component (2) is connected to the test tire (6) through the torque control component (3). The asphalt mixture specimen (4) is directly below the test tire (6). The asphalt mixture specimen (4) is arranged on the rolling resistance test component (5). The top of the asphalt mixture specimen (4) is cooperatively arranged with the test tire (6). The rolling resistance test component (5) includes an upper bracket (51), a lower bracket (52), a driving motor (53) and a torque sensor (54). The upper bracket (51) is slidably connected to the lower bracket (52). The output shaft of the driving motor (53) is arranged on the lower bracket (52). The torque sensor (54) is connected to the output shaft of the driving motor (53). The lower bracket (52) is fixedly connected to the support frame (1). The asphalt mixture specimen (4) is arranged between the upper bracket (51) and the lower bracket (52).

2. The asphalt mixture and tire interactive loading type rolling resistance precise test device according to claim 1, characterized in that: The upper bracket (51) includes upper drag bars (511), guide holes (512) and upper support shafts (513). There are two upper support shafts (513). The two upper support shafts (513) are arranged in parallel between the two upper drag bars (511). The two ends of each upper support shaft (513) are respectively rotatably connected between the two upper drag bars (511). Two guide holes (512) are machined on each upper drag bar (511), and each guide hole (512) is arranged near the end of the upper drag bar (511).

3. The asphalt mixture and tire interactive loading type rolling resistance precise testing device according to claim 2, characterized in that: The lower bracket (52) includes two lower bracket support plates (522), two lower support shafts (523), two outwardly protruding adjustment bolts (524), two bolt balls (525) and four carriage guide columns (521). The four carriage guide columns (521) are arranged vertically and in parallel. Two carriage guide columns (521) are fixedly connected to each lower bracket support plate (522). Both of the two lower support shafts (523) are rotatably connected between the two lower bracket support plates (522). One of the two lower support shafts (523) is fixedly connected to the output shaft of the drive motor (53). The asphalt mixture specimen (4) is arranged between the two lower support shafts (523) and the two upper support shafts (513). One outwardly protruding adjustment bolt (524) is threadedly connected to each lower bracket support plate (522). One bolt ball (525) is rotatably connected to the end of each outwardly protruding adjustment bolt (524). The guide holes (512) are arranged in one-to-one correspondence with the carriage guide columns (521). Each carriage guide column (521) is slidably connected in the corresponding guide hole (512). The two lower support shafts (523) are arranged horizontally and in parallel. One lower support shaft (523) is correspondingly arranged below each carriage roller (513). The axial direction of each carriage roller (513) is the same as the axial direction of its corresponding lower support shaft (523).

4. The asphalt mixture and tire interactive loading type rolling resistance precise test device according to claim 3, characterized in that: The described support frame (1) includes a bottom plate (11), guide columns (12) and a top plate (13). There are multiple guide columns (12). The bottom plate (11) is fixedly connected to the lower sides of the multiple guide columns (12). The bottom end of the top plate (13) is fixedly connected to the multiple guide columns (12). The top plate (13) and the bottom plate (11) are arranged vertically and in parallel. The multiple guide columns (12) are respectively located at the four corners of the top plate (13) and the bottom plate (11).

5. The asphalt mixture and tire interactive loading type rolling resistance precise test device according to claim 4, characterized in that: The described loading assembly (2) includes a first slide plate (21), a second slide plate (22), bearing sleeves (23), a lead screw (24), a nut (25), an outer sleeve (26), a gravity sensor (27) and a spring (28). There are multiple bearing sleeves (23) and springs (28). Multiple bearing sleeves (23) are fixedly connected to the first slide plate (21). Multiple bearing sleeves (23) are fixedly connected to the second slide plate (22). Two bearing sleeves (23) are respectively sleeved on each guide column (12). A spring (28) is sleeved on each guide column (12). The spring (28) is located between the two bearing sleeves (23). One end of the lead screw (24) passes through the top plate (13) and is connected to the nut (25). An outer sleeve (26) is arranged between the nut (25) and the lead screw (24). The outer sleeve (26) passes through the lead screw (24) and is sleeved outside the nut (25). The other end of the lead screw (24) is provided with a gravity sensor (27). The bottom of the gravity sensor (27) abuts against the second slide plate (22). The bottom of the first slide plate (21) abuts against the torque control assembly (3).

6. The asphalt mixture and tire interactive loading type rolling resistance precise test device according to claim 5, characterized in that: The described torque control component (3) includes an upper tire rack plate (31), side plates (32), a motor connection sleeve (33), a tire shaft (34), a tire shaft sleeve (35), bearings (36), a first gland (37), a second gland (38), a motor (39), a sensor (310), a sensor outer sleeve (311) and a motor connection sleeve (33). The two ends of the upper tire rack plate (31) are fixedly connected to the two side plates (32) respectively. The upper end of the upper tire rack plate (31) abuts against the first slide plate (21). The first gland (37) is fixedly connected to the left side plate (32). The tire shaft (34) is arranged between the two side plates (32). Each end of the tire shaft (34) is connected to the adjacent side plate (32) through a bearing (36). The first gland (37) and the second gland (38) are fixedly connected to the two side plates (32) respectively. The sensor (310) is arranged on the tire shaft (34). The tire shaft sleeve (35) is arranged on the tire shaft (34). The sensor outer sleeve (311) is arranged outside the sensor (310). The sensor outer sleeve (311) is fixedly connected to the motor connection sleeve (33). The motor (39) is fixedly connected to the motor connection sleeve (33). The test tire (6) is sleeved on the tire shaft sleeve (35). The sensor (310) is sleeved on the output shaft of the motor (39). The output shaft of the motor (39) is fixedly connected to the tire shaft (34).

7. An accurate test method for the rolling resistance of asphalt mixture and tire under interactive loading is realized by using the accurate test device for the rolling resistance of asphalt mixture and tire under interactive loading described in claims 1, 2, 3, 4, 5 or 6, and is characterized in that: The precise test method for the rolling resistance of asphalt mixture and tire under interactive loading is realized through the following steps: Step 1: Determine the loading load of the loading component (2), the rotation speed of the torque control component (3), and the test parameters of the asphalt mixture specimen (4) and the test tire (6) of the corresponding type; Step 2: Adjust the equipment according to the measurement requirements. The measurement methods are divided into: overall rolling resistance test and local rolling resistance test; Step 3: Obtain the image data and test data of the asphalt mixture specimen (4) and the test tire (6) after the test, calculate the rolling resistance. The difference between the torque values obtained through the overall rolling resistance test and the local rolling resistance test respectively is used as the precise torque value between the asphalt mixture specimen (4) and the test tire (6). The value obtained by dividing the precise torque value by the product of the tire radius and the experimental load is the rolling resistance coefficient between the asphalt mixture specimen (4) and the test tire (6).

8. The method for accurately testing the rolling resistance of an asphalt mixture under interactive loading with a tire according to claim 7, characterized in that: The process of the overall rolling resistance test in Step 2 is as follows: Assemble the torque control component (3) with the test tire (6), install the asphalt mixture specimen (4) in the rolling resistance test component (5), make the test tire (6) contact with the asphalt mixture specimen (4), adjust the loading component (2) to move the test tire (6) downward until it contacts the asphalt mixture specimen (4) until the contact pressure is between 0 - 200 kg, then drive the test tire (6) to rotate through the torque control component (3) at a rotational speed of 100 r / min, and record the torque value; Local rolling resistance test: Adjust the loading component (2) to rise so that there is a certain distance between the test tire (6) and the rolling resistance test component (5), add a wooden square between the test tire (6) and the rolling resistance test component (5) to serve as a separation, start the drive motor (53) to rotate the lower support shaft (523) connected to it until the rotational speed reaches 1000 r / min, and record the torque value when the reading of the torque sensor (54) is stable.

Images