Standard test block for dynamic error calibration of depth measurement of hamburger rut testing machine

Abstract

The utility model discloses a standard test block for calibrating a depth measurement dynamic error of a hamburger rut testing machine, belongs to geometric quantity measurement testing equipment, and aims to solve the technical problem of how to effectively calibrate the dynamic error of a depth measurement system of the hamburger rut testing machine. According to the technical scheme, the test block comprises a test block body, an arc groove part is formed in the center of the upper side face of the test block body, a zero reference plane is arranged on one side of the arc groove part, and identification scale marks are arranged on the other side of the arc groove part; spiral adjusting knobs are respectively arranged at the central positions of two end parts of the test block main body, and handles are respectively arranged at the central positions of two side surfaces of the test block main body.

Description

Technical Field

[0001] This utility model relates to geometric measurement and testing equipment, specifically a standard test block for dynamic error calibration of depth measurement of a Hamburg rut testing machine. Background Technology

[0002] The Hamburg rutting tester is an important piece of equipment widely used to evaluate the rutting resistance of asphalt mixtures. This equipment measures the rutting depth of samples under standard wheel loads by simulating repeated loading in a high-temperature environment to evaluate the rutting resistance of asphalt mixtures.

[0003] The Hamburg rut testing machine records the deformation depth data during the rut formation process using a contact depth measurement device. The experimental data is collected at a fixed interval distance during the movement process. In the high-frequency, dynamic measurement process, due to factors such as sensor response delay, vibration interference, and the accuracy of the acquisition interval distance, there is a certain dynamic error, which affects the accuracy of the measurement data and the reliability of the test results.

[0004] Therefore, how to effectively calibrate the dynamic error of the depth measurement system of the Hamburg rut testing machine and improve the accuracy of measurement data and the reliability of test results is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] The technical objective of this invention is to provide a standard test block for calibrating the dynamic error of the depth measurement system of a Hamburg rut testing machine, thereby addressing the problem of how to effectively calibrate the dynamic error of the depth measurement system of the Hamburg rut testing machine and improve the accuracy of measurement data and the reliability of test results.

[0006] The technical task of this utility model is achieved in the following way: a standard test block for dynamic error calibration of depth measurement of a Hamburg rut tester includes a test block body, an arc groove is provided at the center of the upper side of the test block body, a zero-point reference plane is provided on one side of the arc groove, and a scale line is provided on the other side of the arc groove; a spiral adjustment knob is provided at the center of each end of the test block body, and a handle is provided at the center of each side of the test block body.

[0007] Preferably, the main body of the test block is rectangular, and the spiral adjustment knob is located at both ends of the rectangular test block.

[0008] Preferably, the marking scale lines are either adhesive scale lines or engraved scale lines.

[0009] More preferably, the scale values ​​of the marking lines are -114mm, -91mm, -69mm, -46mm, -23mm, 0mm, +23mm, +46mm, +69mm, +91mm, and +114mm, respectively. The scale values ​​of the marking lines are used to perform dynamic error calibration of the measurement system at multiple depth points.

[0010] Preferably, the main body of the test block is made of 304 stainless steel, which has good thermal stability and corrosion resistance, and a coefficient of linear expansion of 17.3 × 10⁻⁶. -6 / ℃ ensures dimensional stability under test temperature conditions.

[0011] Preferably, the radius of the arc-shaped groove is (775.63±1) mm.

[0012] Preferably, the distance between the lower edge of the arc-shaped groove and the horizontal plane where the upper side of the main body of the test block is located is (20±0.05) mm.

[0013] Preferably, the surface roughness of the arc-shaped groove is Ra0.3μm.

[0014] Preferably, both the marking lines and the zero-point reference plane are located on the upper side of the test block body.

[0015] Ideally, the flatness of the zero-point reference plane should not exceed 0.05 mm.

[0016] The standard test block for dynamic error calibration of depth measurement of the Hamburg rut testing machine of this invention has the following advantages:

[0017] (I) This utility model adopts a symmetrical structure and high processing precision: the central axis is symmetrical and the circular arc structure is precise, which improves the calibration accuracy;

[0018] (II) This utility model sets up multi-point scale: it provides multi-segment depth simulation, which can realize multi-point dynamic error calibration and improve the overall measurement linearity and stability;

[0019] (III) This utility model is equipped with a zero-point reference plane, which simplifies the calibration process: the upper side of the main body of the test block is a planar structure, which can be used as a "zero-point reference" before depth measurement calibration, so that the measurement system can quickly and accurately establish the depth measurement starting point before each calibration, improve calibration efficiency, and reduce human error;

[0020] (iv) The present invention has excellent thermal stability: it is made of 304 stainless steel, which is adapted to the temperature changes of the test environment and ensures that the measured parameters do not fluctuate due to thermal expansion and contraction;

[0021] (v) This utility model has excellent corrosion resistance: 304 stainless steel has good corrosion resistance and can be used for a long time in high humidity and high temperature environments, ensuring the structural integrity and calibration stability of the standard test block.

[0022] (vi) This utility model is easy to operate and highly adaptable: it is equipped with an adjustment knob and a handling handle, which makes it easy to install and disassemble, and can be widely used in different models of Hamburg rut testing machines;

[0023] (vii) This utility model has a high degree of standardization: it can be promoted and applied as a metrological standard instrument in testing machine manufacturing, testing institutions and scientific research institutes, and has good prospects for industry promotion;

[0024] (viii) The test block body of this utility model is provided with spiral adjustment knobs at both ends for fixing with the test machine body to prevent the standard test block from shifting during the measurement process and affecting the measurement results;

[0025] (ix) The test block body of this utility model is also provided with portable handles on both sides, which makes it convenient for operators to carry, install and pick up.

[0026] Therefore, this utility model has the characteristics of reasonable design, simple structure, easy processing, small size, convenient use, and multiple uses, and thus has great value for promotion and use. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] Appendix Figure 1 A schematic diagram of the structure of a standard test block used for dynamic error calibration of depth measurement on a Hamburg rutting tester.

[0029] Appendix Figure 2 For the appendix Figure 1 A-direction view;

[0030] Appendix Figure 3 For the appendix Figure 1 View from direction B in the middle.

[0031] In the figure, 1. Test block body, 2. Arc groove, 3. Marking scale line, 4. Screw adjustment knob, 5. Handle, 6. Zero point reference plane. Detailed Implementation

[0032] The following detailed description of a standard test block for dynamic error calibration of depth measurement of a Hamburg rut testing machine, with reference to the accompanying drawings and specific embodiments, is provided in this specification.

[0033] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] Example:

[0036] This embodiment provides a standard test block for dynamic error calibration of depth measurement of a Hamburg rut testing machine. Its structure includes a test block body 1, an arc groove 2 at the center of the upper side of the test block body 1, a zero reference plane 6 on one side of the arc groove 2, and a scale line 3 on the other side of the arc groove 2; a screw adjustment knob 4 is installed at the center of each end of the test block body 1, and a handle 5 is installed at the center of each side of the test block body 1.

[0037] In this embodiment, the test block body 1 is axially symmetrical in terms of its external shape, internal structure, and mass distribution.

[0038] In this embodiment, the main body 1 of the test block is rectangular, and the spiral adjustment knob 4 is located at both ends of the rectangular test block main body 1.

[0039] In this embodiment, the marking scale line 3 is either an adhesive scale line or a scribed scale line. Adhesive scale lines have a variety of material options (such as PET film and metal foil), can adapt to different environments (such as corrosion resistance and high temperature resistance), are easy to replace, have a simple process, are suitable for mass production, and have low cost (especially for complex shaped substrates). Engraved scale lines are wear-resistant and corrosion-resistant, and are suitable for long-term outdoor or industrial environments (such as mechanical equipment and pipelines).

[0040] In this embodiment, the scale values ​​of the marking line 3 are -114mm, -91mm, -69mm, -46mm, -23mm, 0mm, +23mm, +46mm, +69mm, +91mm, and +114mm, respectively. The scale values ​​of the marking line 3 are used for dynamic error calibration of the measurement system at multiple depth points.

[0041] In this embodiment, the main body 1 of the test block is made of 304 stainless steel, which has good thermal stability and corrosion resistance, and a coefficient of linear expansion of 17.3 × 10⁻⁶. -6 / ℃ ensures dimensional stability under test temperature conditions.

[0042] In this embodiment, the radius of the arc-shaped groove 2 is (775.63±1) mm.

[0043] In this embodiment, the distance between the lower edge of the arc groove 2 and the horizontal plane where the upper side of the test block body 1 is located is (20±0.05) mm.

[0044] In this embodiment, the surface roughness of the arc-shaped groove 2 is Ra0.3μm.

[0045] In this embodiment, both the marking scale line 3 and the zero-point reference plane 6 are located on the upper side of the test block body 1.

[0046] In this embodiment, the flatness of the zero-point reference plane 6 does not exceed 0.05 mm.

[0047] The specific usage process of this embodiment is as follows:

[0048] S1. Place the main body of the test block 1 on the sample tray of the Hamburg rut tester, ensuring that the surface of the main body of the test block 1 is flat and the positioning is accurate; the size of the main body of the test block 1 matches the sample groove, and can be fixed to the test groove by adjusting the length of the screw adjustment knob 4 to avoid the influence of position deviation on the measurement results;

[0049] S2. Start the control system of the Hamburg rutting tester to make the loading wheel freely contact the zero point reference of the test block body 1, start the loading wheel to perform reciprocating motion for a period of time, and at the same time make the depth measurement mechanism return to zero and record it as the reference data.

[0050] S3. Pause the loading wheel, move the test block body 1 so that the loading wheel is in free contact with the arc groove 2 of the test block body, start the loading wheel to perform reciprocating motion for a period of time to simulate the loading path and frequency in the conventional test, during which the system continuously records the depth measurement data.

[0051] The S4 Hamburg rut testing machine control system automatically collects measurement values ​​for multiple cycles. Based on the deviation between the collected data and the theoretical value, it analyzes the dynamic error characteristics of the system and calculates the correction factor through regression analysis, filtering algorithm or calibration curve, and inputs it into the control system to compensate for the dynamic error in the subsequent actual test process.

[0052] S5. After calibration, run the simulation loading process again and observe the stability of the system readings to confirm that the error correction effect meets the accuracy requirements; the calibration process can be repeated if necessary.

[0053] Precautions for use:

[0054] ①The main body 1 of this test block is only used for dynamic error calibration and shall not be used for routine rutting tests;

[0055] ② The measuring mechanism must be in perpendicular contact with the surface of the test block body 1 to avoid errors caused by tilting or sliding of the probe;

[0056] ③ After use, it should be properly cleaned and stored to avoid surface scratches that may affect the nominal height.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A standard test block for calibrating dynamic error of depth measurement of a hamburger wheel tester, characterized in that, The test block includes a main body with an arc-shaped groove at the center of its upper side. A zero-point reference plane is located on one side of the arc-shaped groove, and a scale line is located on the other side. A screw adjustment knob is located at the center of each end of the main body, and a handle is located at the center of each side of the main body.

2. The standard test block for dynamic error calibration of depth measurement of a hamburger wheel test machine according to claim 1, characterized in that, The main body of the test block is rectangular, and the screw adjustment knobs are located at both ends of the rectangular test block.

3. The standard test block for dynamic error calibration of depth measurement of a hamburger wheel test machine according to claim 1, characterized in that, The marking scale lines are either adhesive or engraved.

4. The standard test block for dynamic error calibration of depth measurement of a hamburger wheel test machine according to claim 1 or 3, characterized in that, The scale values ​​of the marking lines are -114mm, -91mm, -69mm, -46mm, -23mm, 0mm, +23mm, +46mm, +69mm, +91mm, and +114mm, respectively. The scale values ​​of the marking lines are used to perform dynamic error calibration of the measurement system at multiple depth points.

5. The standard test block for depth measurement dynamic error calibration of a hamburger wheel test machine of claim 1, wherein, The test block body is made of 304 stainless steel, and the linear expansion coefficient is 17.3x10 -6 / ℃.

6. The standard test block for depth measurement dynamic error calibration of a hamburger wheel test machine of claim 1, wherein, The radius of the circular groove is (775.63±1) mm.

7. The standard test block for dynamic error calibration of depth measurement of the Hamburg rut testing machine according to claim 1, characterized in that, The distance between the lower edge of the arc-shaped groove and the horizontal plane of the upper side of the test block is (20±0.05) mm.

8. The standard test block for depth measurement dynamic error calibration of a hamburger wheel test machine of claim 1, wherein, The surface roughness of the arc-shaped groove is Ra0.3μm.

9. The standard test block for depth measurement dynamic error calibration of a hamburger wheel test machine of claim 1, wherein, The graduated lines and the zero-point reference plane are both located on the upper side of the test block body.

10. The standard test block for dynamic error calibration of depth measurements of a hamburger wheel test machine according to claim 9, characterized in that The flatness of the zero-point reference plane shall not exceed 0.05 mm.

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