Asphalt mixture rut tester capable of accurately testing wheel pressure area

Abstract

The utility model relates to the technical field of asphalt mixture rut tester equipment, in particular to an asphalt mixture rut tester capable of accurately testing the wheel pressure area, which is characterized in that a vision measurement device comprises a bottom plate and a fixing support arranged on one side of the bottom plate and used for fixing a test wheel; a force sensor and a supporting plate arranged on the upper portion of the force sensor are arranged in the center of the bottom plate, the center of the supporting plate and the center of the fixing support are located on the same axis, and a first camera located on the fixing support is arranged at the position opposite to the center point of the supporting plate in the longitudinal direction. A second camera located on the bottom plate is arranged at the position opposite to the center point of the supporting plate in the transverse direction, a plurality of light-emitting plates are arranged on the periphery of the bottom plate, and a light shield is further arranged on the bottom plate. According to the utility model, the test result is more accurate, and the problem that the measurement result is not accurate enough due to data error in the asphalt mixture rut test is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of asphalt mixture rutting tester equipment, in particular to an asphalt mixture rutting tester which can accurately test the wheel pressure area. Background Art

[0002] With the development of highway traffic construction, especially high-grade roads with asphalt pavement as the main form, higher and higher requirements are placed on the quality of road materials. The performance and composition design of road materials affect the quality of the road surface, and the use of scientific and reasonable test methods to test the performance of asphalt mixtures is crucial for the correct use of materials, scientific design of pavement, and evaluation of road performance.

[0003] Asphalt mixture rutting tester is a special equipment for measuring the high temperature dynamic stability of asphalt mixture. The rutting test uses asphalt concrete plate specimens formed by wheel rolling. The high temperature deformation resistance of asphalt concrete is evaluated by rutting depth and dynamic stability indicators.

[0004] The practice of the asphalt mixture rutting test T0719-2011 in the specification JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" is to measure the ground pressure of the test wheel during the preparation of the experiment: the measurement is carried out at 60°C, a 50mm thick steel plate is placed on the test bench, a millimeter grid paper is placed on it, and a new carbon paper is placed on it. After the specified 700N load, the test wheel is statically pressed on the carbon paper, and the wheel pressure area can be obtained on the grid paper, and the ground pressure can be obtained from it. When the pressure does not meet 0.7MPa±0.05MPa, the load should be adjusted appropriately. This method has low measurement efficiency and large measurement errors. The test process requires the full participation of test personnel, which occupies human resources.

[0005] The Chinese patent number CN215866203U discloses an asphalt mixture rutting tester that can accurately apply pressure. The loaded contact surface area scanning device includes a rangefinder arranged under the test bench, a parallel guide rail arranged on the rangefinder, and a micro laser rangefinder. The contact surface between the rubber wheel and the rutting plate is measured by the rangefinder and the micro laser rangefinder. However, since the laser emitted by the laser rangefinder is parallel to the surface of the load-bearing plate, the laser will be blocked by the load-bearing plate and cannot be irradiated to the contact part between the bottom of the wheel and the load-bearing plate, so the actual indentation length cannot be accurately measured; secondly, the surface of the wheel is an arc, and in the process of reflecting the laser, diffuse reflection will be generated, which will interfere with the measurement result of the laser rangefinder; therefore, the measurement result obtained by the laser distance measurement technology will produce errors.

[0006] In view of the above problems, it is necessary to provide a new technical solution to overcome the above defects. Utility Model Content

[0007] In view of the above problems, the utility model provides an asphalt mixture rutting tester which can accurately test the wheel pressure area, thereby solving the problem in the prior art that the contact area measurement and calculation of the test wheel of the rutting tester have errors, resulting in inaccurate test data.

[0008] The technical solution adopted by the utility model to solve its technical problems is: an asphalt mixture rutting tester capable of accurately testing wheel pressure area, comprising a tester body and a test wheel, a visual measuring device is arranged on a test bench in the tester body, the visual measuring device comprises a bottom plate and a fixing bracket arranged on one side of the bottom plate for fixing the test wheel, a force sensor and a support plate arranged on the upper part of the force sensor are arranged at the center of the bottom plate, the center of the support plate and the center of the fixing bracket are located on the same axis, a first camera located on the fixing bracket is arranged at a position relative to the center point of the longitudinal direction of the support plate, a second camera located on the bottom plate is arranged at a position relative to the center point of the transverse direction of the support plate, a plurality of light-emitting panels are arranged around the bottom plate, a light-shielding cover is also arranged on the bottom plate, and an opening is arranged on the top surface of the light-shielding cover to make the top of the test wheel appear.

[0009] As an optimization, the fixing bracket includes a fixing plate and supporting arms arranged on both sides of the fixing plate.

[0010] As an optimization, an adjustment plate is provided between the first camera and the fixed bracket, and between the second camera and the bottom plate, a slide groove is provided on the adjustment plate, and a sliding shaft cooperating with the slide groove is fixedly provided on the first camera and the second camera.

[0011] As an optimization, a level is provided on both the first camera and the second camera.

[0012] As an optimization, two light-emitting panels are provided, which are respectively located on both sides of the base plate.

[0013] As an optimization, the distance between the two arms is greater than the thickness of the test wheel.

[0014] As an optimization, the sliding shaft is provided with an external thread.

[0015] As an optimization, the difference between the distance between the two arms and the thickness of the test wheel is less than 3 mm.

[0016] As an optimization, lens shields are provided on both the first camera and the second camera.

[0017] The beneficial effects of the utility model are as follows: the utility model provides an asphalt mixture rutting tester which can accurately test the wheel pressure area, a visual measuring device is arranged in the tester body, and the front and side surfaces of the contact part of the test wheel and the support plate are photographed respectively by the first camera and the second camera, and the controller performs visual recognition on the photographed pictures and calculates the actual distance corresponding to each pixel in the image, thereby reducing the error of manual measurement and ensuring the accuracy of the length and width data of the contact part of the test wheel and the support plate; the light-emitting panel provides internal lighting, and the lighting brightness can be adjusted as needed to ensure accurate recognition of the photographed photos; the setting of the light shield isolates the inside and outside of the visual measuring device from the outside world to prevent external light from affecting the shooting effect of the first camera and the second camera; the device makes the test results more accurate and solves the problem that the measurement results of the asphalt mixture rutting test are not accurate due to data errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the visual measurement device of the utility model (without the light shield);

[0020] Figure 3 It is a structural schematic diagram of the sunshade of the utility model.

[0021] Wherein: 1. test instrument body, 2. test wheel, 3. visual measuring device, 4. bottom plate, 5. fixed bracket, 6. force sensor, 7. support plate, 8. first camera, 9. second camera, 10. light-emitting board, 11. light shield, 12. opening, 13. fixed plate, 14. support arm, 15. adjustment plate, 16. slide groove, 17. sliding shaft, 18. lens cover. DETAILED DESCRIPTION

[0022] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] like Figure 1-3 As shown, an asphalt mixture rutting tester capable of accurately testing the wheel pressure area comprises a tester body 1 and a test wheel 2. A visual measuring device 3 is provided on a test bench in the tester body 1. The visual measuring device 3 is electrically connected to the tester body 1 so that data of the visual measuring device 3 is transmitted to a controller of the tester body 1. The visual measuring device 3 comprises a bottom plate 4 and a fixing bracket 5 arranged on one side of the bottom plate 4 for fixing the test wheel 2. A force sensor 6 and a support plate 7 arranged on the upper part of the force sensor 6 are provided at the center of the bottom plate 4. The center of the support plate 7 and the center of the fixing bracket 5 are located on the same axis so that the test wheel 2 is placed in the middle of the support plate 7 to ensure the stability of the pressurization. A first camera 8 located on the fixing bracket 5 is provided at a position opposite to the center point of the longitudinal direction of the support plate 7 so that the first camera 8 can capture the contact surface between the test wheel 2 and the support plate 7. A side photo of the test wheel 2 is taken, and the controller recognizes the taken photo and calculates the actual distance corresponding to each pixel in the image, that is, the width; a second camera 9 located on the bottom plate 4 is provided at a position relative to the center point of the lateral direction of the support plate 7, so that the second camera 9 takes a front photo of the contact surface between the test wheel 2 and the support plate 7, and the controller recognizes the taken photo and calculates the actual distance corresponding to each pixel in the image, that is, the length; a plurality of light-emitting panels 10 are provided around the bottom plate 4, and two of the light-emitting panels 10 are provided, which are respectively located on both sides of the bottom plate 4, and the light-emitting panels 10 provide internal lighting to ensure the light effect during shooting; a light-shielding cover 11 is also provided on the bottom plate 4, and an opening 12 is provided on the top surface of the light-shielding cover 11 to make the top of the test wheel 2 appear, and the light-shielding cover 11 isolates the inside of the device from the outside to prevent external light from affecting the shooting effect of the photo.

[0026] like Figure 2 As shown, the fixing bracket 5 includes a fixing plate 13 and supporting arms 14 arranged on both sides of the fixing plate 13, the distance between the two supporting arms 14 is greater than the thickness of the test wheel 2, and the difference between the distance between the two supporting arms 14 and the thickness of the test wheel 2 is less than 3 mm. When the test wheel 2 is placed between the two supporting arms 14, the stability of the test wheel 2 is ensured.

[0027] like Figure 2As shown, an adjustment plate 15 is provided between the first camera 8 and the fixed bracket 5, and between the second camera 9 and the base plate 4. A slide groove 16 is provided on the adjustment plate 15. A sliding shaft 17 matching the slide groove 16 is fixedly provided on the first camera 8 and the second camera 9. An external thread is provided on the sliding shaft 17. The arrangement of the slide groove 16 and the sliding shaft 17 makes the height position of the first camera 8 and the second camera 9 adjustable, so as to make them face the contact part between the test wheel 2 and the support plate 7. When fixed, the first camera 8 and the second camera 9 are respectively fixed to the corresponding adjustment plate 15 by nuts matching the sliding shaft 17. A level is provided on the first camera 8 and the second camera 9. A lens cover 18 is provided on the first camera 8 and the second camera 9.

[0028] Working principle: The utility model provides an asphalt mixture rutting tester that can accurately test the wheel pressure area. The use steps are as follows:

[0029] 1. Place the visual measuring device 3 on the test bench inside the tester body 1, open the light shield 11, clamp the test wheel 2 between the two arms 14 on the visual measuring device 3, and make the test wheel 2 face and place it in the middle of the support plate 7, adjust the light intensity of the light-emitting board 10, set the temperature inside the tester body 1 to 60°C, and then calibrate the focal lengths of the force sensor 6, the first camera 8 and the second camera 9. After the adjustment is completed, place the light shield 11;

[0030] 2. Start the tester body 1. After the tester body 1 applies a load of 700N to the test wheel 2, the first camera 8 and the second camera 9 respectively take photos of the front and side surfaces of the contact portion between the test wheel 2 and the support plate 7, transmit the photos to the controller for identification and measurement, and obtain the length and width of the contact portion between the test wheel 2 and the support plate 7;

[0031] 3. The controller automatically calculates the area of ​​the indentation according to the length and width and calculates the pressure when the load is 700N according to the pressure calculation formula. By adjusting the counterweight of the tester body 1, the pressure reaches 0.7Mpa±0.05Mpa.

[0032] The above-mentioned specific implementation methods are only specific cases of the present utility model. The patent protection scope of the present utility model includes but is not limited to the product form and style of the above-mentioned specific implementation methods. Any appropriate changes or modifications made to them by ordinary technicians in the relevant technical field in accordance with the claims of the present utility model shall fall within the patent protection scope of the present utility model.

Claims

1. An asphalt mixture rutting tester capable of accurately testing wheel pressure area, comprising a tester body and a test wheel, characterized in that: A visual measuring device is provided on the test bench in the tester body, and the visual measuring device includes a bottom plate and a fixing bracket arranged on one side of the bottom plate for fixing the test wheel. A force sensor and a support plate arranged on the upper part of the force sensor are provided at the center of the bottom plate, the center of the support plate and the center of the fixing bracket are located on the same axis, a first camera located on the fixing bracket is provided at a position opposite to the center point of the longitudinal direction of the support plate, a second camera located on the bottom plate is provided at a position opposite to the center point of the transverse direction of the support plate, a plurality of light-emitting panels are provided along the four sides of the bottom plate, a light-shielding cover is also provided on the bottom plate, and an opening is provided on the top surface of the light-shielding cover to allow the top of the test wheel to appear.

2. The asphalt mixture rutting tester capable of accurately testing the wheel pressure area according to claim 1 is characterized in that: The fixing bracket comprises a fixing plate and supporting arms arranged on both sides of the fixing plate.

3. The asphalt mixture rutting tester capable of accurately testing the wheel pressure area according to claim 1 is characterized in that: An adjustment plate is provided between the first camera and the fixed bracket, and between the second camera and the bottom plate. A slide groove is provided on the adjustment plate. A sliding shaft matching the slide groove is fixedly provided on the first camera and the second camera.

4. The asphalt mixture rutting tester capable of accurately testing the wheel pressure area according to claim 3 is characterized in that: The first camera and the second camera are both provided with a level.

5. The asphalt mixture rutting tester capable of accurately testing the wheel pressure area according to claim 1 is characterized in that: There are two light-emitting panels, which are respectively located on two sides of the bottom plate.

6. The asphalt mixture rutting tester capable of accurately testing the wheel pressure area according to claim 2 is characterized in that: The distance between the two arms is greater than the thickness of the test wheel.

7. The asphalt mixture rutting tester capable of accurately testing the wheel pressure area according to claim 3 is characterized in that: The sliding shaft is provided with an external thread.

8. The asphalt mixture rutting tester capable of accurately testing the wheel pressure area according to claim 6 is characterized in that: The difference between the distance between the two arms and the thickness of the test wheel is less than 3 mm.

9. The asphalt mixture rutting tester capable of accurately testing the wheel pressure area according to claim 8, characterized in that: The first camera and the second camera are both provided with lens shields.

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