Straightness measuring instrument calibration device and calibration platform

Abstract

The utility model discloses a straightness measuring instrument calibration device and a calibration platform, the straightness measuring instrument calibration device comprises a first profiling steel rail, the first profiling steel rail comprises a first profiling surface on the top surface and a second profiling surface on one side, the first profiling surface and a steel rail driving surface are arranged in a profiling manner, and the second profiling surface is arranged on the other side of the first profiling steel rail. The second profiling surface and the guide surface of the steel rail are arranged in a profiling manner, and each of the first profiling surface and the second profiling surface comprises a plurality of step surfaces; the straightness measuring instrument verification platform comprises a straightness measuring instrument return-to-zero verification device and a straightness measuring instrument verification device. The straightness measuring instrument return-to-zero verification device comprises a second profiling steel rail, and the top face of the second profiling steel rail is arranged to be a horizontal standard face. According to the utility model, a real measurement environment can be better simulated, and the verification precision can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of railway measuring equipment, in particular to a calibration device and a calibration platform for a straightness measuring instrument. Background Art

[0002] With the rapid development of railways, the requirements for rail welding quality are becoming increasingly stringent. Weld joint straightness, a key indicator for evaluating rail weld quality, varies depending on the line speed. Weld joint straightness is crucial for train speed, smooth operation, and passenger comfort. Excessive straightness can cause significant wheel-rail forces and impact vibrations at high train speeds, significantly damaging the track and rolling stock, and generating significant noise. The straightness of the weld joint is measured by a straightness measuring instrument. The most commonly used straightness measuring instrument is an electronic straight ruler. The electronic straight ruler needs to be calibrated before leaving the factory or after multiple measurements. Generally, only a simple test can be performed on site using a section of rail. However, due to the influence of the on-site environment and the condition of the rail, the reliability of the entire electronic straight ruler cannot be tested and evaluated, which greatly affects the accuracy of the electronic straight ruler calibration. Therefore, a device or platform that can be used to calibrate the straightness measuring instrument is urgently needed to be developed. The device or platform can truly simulate the actual wear of the rail to improve the calibration accuracy of the straightness measuring instrument.

[0003] In the prior art, Chinese application publication number CN103278125A discloses a calibration platform for a rail straightness measuring instrument and its application method. The calibration platform comprises at least one profiling block with a profiling surface. The profiling block is positioned above a level supported by at least two leveling supports. The rail straightness measuring instrument is calibrated by comparing the difference between the waveform value determined by the profiling surface on the profiling block and the measured value of the rail straightness measuring instrument. However, this solution still has the following problems:

[0004] (1) A contoured surface is set up to simulate the running surface of the rail, but the wear condition of the guide surface is very different from that of the running surface. Since the guide surface of the rail is not simulated in this scheme, the actual wear condition of the rail cannot be truly simulated.

[0005] (2) This solution is to use a flatness measuring instrument to measure directly on the contoured surface, and then compare the measured value with the waveform determination value. Before the measurement, it is not verified whether the measuring instrument is in a zero state. If the measuring instrument is not in a zero state, it will affect the accuracy of the measured value, thereby affecting the accuracy of the calibration.

[0006] Therefore, it is necessary to provide a flatness measuring instrument calibration device and a calibration platform to solve the above technical problems. Utility Model Content

[0007] The main purpose of the utility model is to provide a calibration device for a flatness measuring instrument, which can better simulate a real measurement environment and improve the accuracy of calibration.

[0008] The utility model achieves the above-mentioned object through the following technical solution: a straightness measuring instrument calibration device, which includes a first profiling rail and a rotating unit driving the first profiling rail to rotate around a horizontal rotation axis; the first profiling rail includes a first profiling surface on the top surface and a second profiling surface on one side, the first profiling surface is configured to conform to the rail running surface, and the second profiling surface is configured to conform to the rail guide surface, and the first profiling surface and the second profiling surface both include a plurality of step surfaces.

[0009] Furthermore, the rotating unit includes a positioning rotating plate for installing the first contoured rail, support shafts relatively arranged at both ends of the positioning rotating plate, and a base plate for supporting the positioning rotating plate, and the support shafts are all arranged on the base plate through support seats.

[0010] Furthermore, a plurality of first positioning assemblies are provided on the positioning rotating plate, and the first positioning assemblies include a positioning block and a first fastener provided on the positioning block and pressed against the first contoured rail.

[0011] Furthermore, the bottom plate is provided with an avoidance opening, and the avoidance opening is opened on a side away from the second contouring surface.

[0012] Furthermore, the line connecting the axes of the two support shafts is the horizontal rotation axis when the positioning rotating plate rotates. The positioning rotating plate is symmetrically arranged about the horizontal rotation axis, and the horizontal rotation axis is located above the bottom plate and away from the avoidance opening.

[0013] Furthermore, the bottom plate is provided with a limiting assembly near the avoidance opening for limiting the first contoured rail, the limiting assembly includes a limiting seat and a plurality of limiting blocks detachably provided on the limiting seat, and the limiting blocks are wedge-shaped structures on the side facing the first contoured rail.

[0014] Another object of the present invention is to provide a flatness measuring instrument calibration platform, which can determine whether the flatness measuring instrument is in a zeroing state before calibration, and perform calibration after zeroing is completed, thereby improving the accuracy of calibration.

[0015] The utility model achieves the above-mentioned purpose through the following technical solutions: a flatness measuring instrument calibration platform, which includes a flatness measuring instrument zeroing verification device and the above-mentioned flatness measuring instrument calibration device.

[0016] Furthermore, the straightness measuring instrument zeroing verification device includes a second profiled rail, and the top surface of the second profiled rail is set as a horizontal standard surface.

[0017] Furthermore, the straightness measuring instrument zeroing verification device also includes a mounting base for mounting the second contoured rail, and a plurality of second positioning assemblies are provided on the mounting base, and the plurality of second positioning assemblies are distributed on both sides of the second contoured rail.

[0018] Compared with the prior art, the flatness measuring instrument calibration device and calibration platform of the utility model have the following beneficial effects:

[0019] (1) A straightness measuring instrument zeroing verification device is provided to verify whether the straightness measuring instrument is in the zeroing state before calibration. If it is not zeroed, it needs to be manually zeroed. The straightness measuring instrument can only be accurately calibrated when it is in the zeroing state. Therefore, this solution can improve the accuracy of the straightness measuring instrument calibration;

[0020] (2) The first profiling rail provided on the calibration device of the straightness measuring instrument includes a first profiling surface provided to emulate the running surface of the rail and a second profiling surface provided to emulate the guide surface of the rail. The first profiling rail can simulate the actual wear condition of the rail. During calibration, the measurement values ​​of the first profiling surface and the second profiling surface are comprehensively judged to calibrate the straightness measuring instrument, which will further improve the calibration accuracy.

[0021] (3) The first profiled rail is a standard rail that is directly machined to form different step surfaces. Direct processing of the rail can better simulate the real measurement environment and further improve the accuracy of the calibration. In addition, the processing is simple and convenient with low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a calibration device and a calibration platform for a flatness measuring instrument according to an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the top view of the calibration device and calibration platform of the flatness measuring instrument according to the embodiment of the utility model;

[0024] Figure 3 This is a schematic structural diagram of a calibration device for a flatness measuring instrument according to an embodiment of the present utility model;

[0025] Figure 4 This is a structural diagram of the straightness measuring instrument calibration device according to the present utility model after removing the limit assembly;

[0026] Figure 5 This is a schematic structural diagram of the first profiled rail according to an embodiment of the present utility model;

[0027] Figure 6 This is a schematic diagram of the longitudinal cross-section structure of the first profiled rail in an embodiment of the present utility model;

[0028] The numbers in the figure represent:

[0029] 100-Straightness measuring instrument calibration device and calibration platform;

[0030] 1-straightness measuring instrument zeroing verification device, 11-second profiling rail, 12-standard surface, 13-mounting seat, 14-second positioning assembly;

[0031] 2-straightness measuring instrument calibration device, 21-first profiling rail, 211-step surface, 212-first profiling surface, 213-second profiling surface, 22-rotation unit, 221-positioning rotation plate, 222-support shaft, 223-bottom plate, 224-support seat, 225-second fastener, 23-first positioning assembly, 231-positioning block, 232-first fastener, 24-limiting assembly, 241-limiting seat, 242-limiting block, 25-avoidance opening. DETAILED DESCRIPTION

[0032] Please refer to Figures 1-6 This embodiment provides a flatness measuring instrument calibration device and calibration platform 100. The flatness measuring instrument calibration device and calibration platform 100 include a flatness measuring instrument zeroing verification device 1 and a flatness measuring instrument calibration device 2. A flatness measuring instrument is first positioned on the flatness measuring instrument zeroing verification device 1 for verification to determine whether the flatness measuring instrument is in the zeroing state. After the flatness measuring instrument is zeroed, the flatness measuring instrument is placed on the flatness measuring instrument calibration device 2 for measurement. The measured value is compared with the true value, and the flatness measuring instrument is calibrated based on the difference between the measured value and the true value.

[0033] The straightness measuring instrument calibration device 2 includes a first profiling rail 21, which includes a first profiling surface 212 on the top surface and a second profiling surface 213 on one side. The first profiling surface 212 is configured to conform to the rail running surface, and the second profiling surface 213 is configured to conform to the rail guide surface.

[0034] In this embodiment, both the first contoured surface 212 and the second contoured surface 213 include several stepped surfaces 211. The length and height of the stepped surfaces 211 have a range of values, but they are not identical, similar to a square wave with inconsistent height and / or width, which facilitates testing. The range of values ​​for the length and height of the stepped surfaces 211 can be set according to actual conditions and is not limited here. The first contoured rail 21 is a standard rail directly machined to form different stepped surfaces 211. The length and height of each stepped surface 211 have a true value. The standard rail is machined to form several steps of varying depths, and the range of step depth values ​​can meet the range requirements of the flatness measuring instrument. Direct machining of the rail better simulates the real-world measurement environment, is simple and convenient, and is low-cost. The first contoured surface 212 extends along its length to form a first true value line for the first contoured surface 212, which is used as the true value for the running surface. The second contoured surface 213 extends along its length to form a second true value line for the second contoured surface 213, which is used as the true value for the guide surface.

[0035] In other embodiments, the first profiling surface 212 and the second profiling surface 213 may be configured as sine (cosine) waves or other periodic waveforms, and the wavelength and amplitude of the sine (cosine) waves have a series of values ​​to meet the range requirements of the flatness measuring instrument.

[0036] During calibration on the flatness measuring instrument calibration device 2, the flatness measuring instrument is first electrically connected to the display screen. The instrument is then positioned on the first contoured surface 212. A measuring element (e.g., a sensor) within the instrument measures the first contoured surface 212. The measuring element moves from one end of the first contoured surface 212 to the other, creating a real-time measurement line for the first contoured surface 212 on the display screen. Because the second contoured surface 213 is located on the side of the first contoured rail 21, the instrument cannot be positioned directly on the second contoured surface 213 when measuring the second contoured surface 213. If the instrument is directly handheld and brought close to the second contoured surface 213, insufficient contact between the instrument and the second contoured surface 213 may occur, leading to inaccurate measurement results. In order to solve this problem, a rotating unit 22 is provided to drive the first profiling rail 21 to rotate around a horizontal rotation axis. The direction of the horizontal rotation axis is parallel to the length direction of the first profiling rail 21. The rotating unit 22 can drive the first profiling rail 21 to rotate around the horizontal rotation axis, so that the second profiling surface 213 is transformed from a vertical state to an inclined upward state. When the second profiling surface 213 is inclined, it is set at an angle to the vertical axis, which facilitates the positioning of the flatness measuring instrument.

[0037] The rotating unit 22 includes a positioning rotating plate 221 for installing the first contoured rail 21, support shafts 222 relatively arranged at both ends of the positioning rotating plate 221, and a base plate 223 for supporting the positioning rotating plate 221. The support shafts 222 are all arranged on the base plate 223 through support seats 224, and the support seats 224 are arranged on the base plate 223 through second fasteners 225.

[0038] To prevent the first profile rail 21 from shifting in position and to ensure that the first profile rail 21 and the positioning and rotating plate 221 can rotate synchronously, a plurality of first positioning assemblies 23 are provided on the positioning and rotating plate 221. The plurality of first positioning assemblies 23 are distributed on both sides of the first profile rail 21, stably positioning the first profile rail 21 on the positioning and rotating plate 221. The first positioning assemblies 23 include a positioning block 231 and a first fastener 232 disposed on the positioning block 231 and pressed against the first profile rail 21. The first fastener 232 is screwed onto the positioning block 231. When the first fastener 232 is tightened, the end of the first fastener 232 presses against the first profile rail 21, pressing the first profile rail 21 against the positioning and rotating plate 221, thereby positioning the first profile rail 21 on the positioning and rotating plate 221.

[0039] The first fastener 232 and the second fastener 225 can be selected from bolts, screws, pins, or fasteners of other structures, which are not limited here.

[0040] The positioning rotating plate 221 rotates about a horizontal axis, and the base plate 223 is located below the positioning rotating plate 221. The base plate 223 is provided with an escape opening 25 that allows the positioning rotating plate 221 to pass through. This escape opening 25 is located on a side away from the second contouring surface 213. When the positioning rotating plate 221 is manually rotated, the positioning rotating plate 221 rotates the first contouring rail 21 along with it by a set angle. One side of the positioning rotating plate 221 rotates into the escape opening 25, while the other side rises upward. Simultaneously, the second contouring surface 213 transitions from a vertical position to an upwardly tilted position, facilitating the positioning of the flatness measuring instrument. In this embodiment, the rotation angle is 60°, and the second contouring surface 213 transitions from a vertical position to an upwardly tilted position, facilitating the positioning of the flatness measuring instrument. In other embodiments, the rotation angle can be set to 45°, 50°, 90°, or other angles depending on the actual situation. Accordingly, the position of the horizontal axis of rotation is adjusted accordingly. The rotation angle is not limited here.

[0041] The line connecting the centers of the two support shafts 222 forms the horizontal rotation axis of the positioning rotating plate 221 during its rotation. The positioning rotating plate 221 is symmetrically arranged about the horizontal rotation axis, with its length extending parallel to the direction of the horizontal rotation axis. To prevent the positioning rotating plate 221 from rotating into the avoidance opening 25 when measuring the first profiling surface 212, thereby affecting measurement accuracy, the horizontal rotation axis is positioned above the base plate 223 and away from the avoidance opening 25. That is, when measuring the first profiling surface 212, the positioning rotating plate 221 is horizontal, and the area of ​​the positioning rotating plate 221 supported on the base plate 223 is larger than the area of ​​the avoidance opening 25. This ensures the stability of the positioning rotating plate 221 supported on the base plate 223, thereby preventing the positioning rotating plate 221 from rotating into the avoidance opening 25 and ensuring accuracy during measurement of the first profiling surface.

[0042] A limiting assembly 24 for limiting the position of the first contoured rail 21 is provided near the avoidance opening 25 of the bottom plate 223. The limiting assembly 24 includes a limiting seat 241 and a plurality of limiting blocks 242 detachably mounted on the limiting seat 241. The limiting blocks 242 have a wedge-shaped structure on the side facing the first contoured rail 21. When the first contoured rail 21 is rotated to a set angle, the side of the first contoured rail 21 abuts against the limiting blocks 242. The wedge-shaped structures on the limiting blocks 242 facilitate conformal contact with the side of the first contoured rail 21. If the rotation angle of the first contoured rail 21 changes, the limiting blocks 242 of different heights or different wedge-shaped structures can be replaced to limit the first contoured rail 21.

[0043] The straightness measuring instrument zeroing verification device 1 includes a second profiling rail 11. The top surface of the second profiling rail 11 is set as a standard surface 12. The standard surface 12 is a horizontal straight surface. Preferably, the center of the standard surface 12 is a horizontal straight line. It is used to verify whether the straightness measuring instrument is in a zero state. The measuring element of the straightness measuring instrument is aligned with the center line of the standard surface 12. The straightness measuring instrument measures the standard surface 12. If the measured values ​​form a horizontal straight line with all zeros, it is determined that the straightness measuring instrument is in a zero state. If the measured values ​​form a horizontal straight line that is not zero, it means that the straightness measuring instrument has not been zeroed and the straightness measuring instrument needs to be manually zeroed. If the measured values ​​form a curve, it is determined that the straightness measuring instrument is in an abnormal state and needs to be confirmed and repaired.

[0044] In order to ensure the stability of the second profiled rail 11 during measurement, the straightness measuring instrument zeroing verification device 1 also includes a mounting base 13 for mounting the second profiled rail 11. A plurality of second positioning components 14 are provided on the mounting base 13. The plurality of second positioning components 14 are distributed on both sides of the second profiled rail 11 to stably position the second profiled rail 11 on the mounting base 13.

[0045] The structure of the second positioning assembly 14 is the same as or similar to that of the first positioning assembly 23 , and will not be further described here.

[0046] When using the flatness measuring instrument calibration platform 100 provided in this solution, first electrically connect the flatness measuring instrument to the display screen, position the flatness measuring instrument on the standard surface 12 of the second contoured rail 11, and align the measuring element of the flatness measuring instrument with the center line of the standard surface 12. The measuring element moves from one end of the standard surface 12 to the other end, and a standard surface measurement value line is displayed in real time on the display screen. If the standard surface measurement value line is a curve, it is determined that the flatness measuring instrument is abnormal and needs to be confirmed and repaired; if the standard surface measurement value line is a non-zero horizontal straight line, , it is determined that the straightness measuring instrument has not been reset to zero, and the straightness measuring instrument needs to be manually reset to zero. After manual zeroing, the calibration action can be performed; if the standard surface measurement value line is a horizontal straight line of zero, it is determined that the straightness measuring instrument is in the zero state, and the calibration action can be directly performed; the straightness measuring instrument in the zero state is positioned on the first profiling surface 212 on the first profiling rail 21, and the measuring element inside the straightness measuring instrument measures the first profiling surface 212, and the measuring element of the straightness measuring instrument is aligned with the center line of the first profiling surface 212, and the measuring element is measured from the first profiling surface 212. When one end of a profiling surface 212 moves toward the other end, a first measurement value line of the first profiling surface 212 will be formed on the display screen in real time. The first measurement value line is used as the driving surface measurement value, and the actual driving surface value is compared with the driving surface measurement value to obtain the driving surface difference value; then the positioning rotating plate 221 is manually rotated to drive the first profiling rail 21 to rotate the set angle. One side of the first profiling rail 21 is restricted on the limit block 242, and the second profiling surface 213 is transformed from a vertical state to an inclined upward state, and the flatness measuring instrument is positioned on the first profiling rail 21. On the second profiling surface 213, the measuring element inside the flatness measuring instrument measures the second profiling surface 213 and aligns the measuring element with the center line of the second profiling surface 213. The measuring element moves from one end of the second profiling surface 213 to the other end, forming a second measurement value line of the second profiling surface 213 on the display screen in real time. This second measurement value line is used as the guide surface measurement value. The actual guide surface value is compared with the guide surface measurement value to obtain the guide surface difference value. The flatness measuring instrument is calibrated by comprehensively determining the driving surface difference value and the guide surface difference value.

[0047] The above descriptions are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. Flatness measuring instrument calibration device, characterized by: It includes a first profiling rail, which includes a first profiling surface on the top surface and a second profiling surface on one side. The first profiling surface and the rail running surface are configured to align with each other to form a straightness measuring instrument. The invention is characterized in that: it includes a first profiling rail and a rotating unit that drives the first profiling rail to rotate around a horizontal rotation axis; the first profiling rail includes a first profiling surface on the top surface and a second profiling surface on one side, the first profiling surface is configured to align with the rail running surface, the second profiling surface is configured to align with the rail guide surface, and both the first profiling surface and the second profiling surface include a plurality of step surfaces.

2. The flatness measuring instrument calibration device according to claim 1, characterized in that: The rotating unit includes a positioning rotating plate for installing the first contoured rail, support shafts relatively arranged at both ends of the positioning rotating plate, and a bottom plate for carrying the positioning rotating plate. The support shafts are all arranged on the bottom plate through support seats.

3. The flatness measuring instrument calibration device according to claim 2, characterized in that: A plurality of first positioning components are provided on the positioning rotating plate. The first positioning components include a positioning block and a first fastener provided on the positioning block and pressed against the first contoured rail.

4. The flatness measuring instrument calibration device according to claim 2, characterized in that: The bottom plate is provided with an avoidance opening, and the avoidance opening is opened on a side away from the second contouring surface.

5. The flatness measuring instrument calibration device according to claim 4, characterized in that: The line connecting the two support shaft axes is the horizontal rotation axis when the positioning rotation plate rotates. The positioning rotation plate is symmetrically arranged about the horizontal rotation axis, and the horizontal rotation axis is located above the bottom plate and away from the avoidance opening.

6. The flatness measuring instrument calibration device according to claim 4, characterized in that: The bottom plate is provided with a limiting assembly near the avoidance opening for limiting the first contoured rail. The limiting assembly includes a limiting seat and a plurality of limiting blocks detachably provided on the limiting seat. The limiting blocks are wedge-shaped structures on the side facing the first contoured rail.

7. Flatness measuring instrument calibration platform, characterized by: The device comprises a flatness measuring instrument zeroing verification device and a flatness measuring instrument calibration device according to any one of claims 1 to 6.

8. The flatness measuring instrument calibration platform according to claim 7, characterized in that: The straightness measuring instrument zeroing verification device comprises a second profiled steel rail, the top surface of which is set as a horizontal standard surface.

9. The flatness measuring instrument calibration platform according to claim 8, characterized in that: The straightness measuring instrument zeroing verification device further comprises a mounting base for mounting the second contoured rail, wherein the mounting base is provided with a plurality of second positioning assemblies, and the plurality of second positioning assemblies are distributed on both sides of the second contoured rail.

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