A sensor calibration device and method for measuring radial deformation of a rotating curved surface

Abstract

The application discloses a kind of sensor calibration device and method for rotating curved surface radial deformation measurement, comprising: rack, motor and frequency converter are provided on rack, coaxially fixed with to be calibrated gullet on the output shaft of motor, and frequency converter is used to adjust the rotating speed of motor;Displacement calibration combination device, including fixed on rack X direction guide rail, fixed on the slider of X direction guide rail Z direction guide rail and fixed on the slider of Z direction guide rail accurate displacement adjusting mechanism;Reflective optical fiber displacement sensor is arranged on the moving end of accurate displacement adjusting mechanism, and the probe of reflective optical fiber displacement sensor is arranged along X direction;With the following points: the calibrated surface is rotated by motor, and the obtained calibration curve considers the influence of rotating calibrated surface on sensor, without secondary correction;Calibrated surface rotating speed can be adjusted, multiple continuous calibration of calibrated surface at different rotating speeds can be realized, and calibration efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of sensor calibration instrument technology, and more specifically, to a sensor calibration device and method for measuring radial deformation of a rotating surface. Background Technology

[0002] Rotating machinery such as aero engines and gas turbines have complex structures, containing numerous high-speed rotating components and stationary components of various shapes. Due to their high-pressure and high-temperature operating conditions, the rotating components simultaneously bear centrifugal and thermal loads, resulting in an increase in the radial dimension of the rotor during operation. This leads to unpredictable changes in the rotor-stationary fit clearance, significantly impacting the operating efficiency and safety of the rotating machinery. Therefore, dynamic real-time measurement of the radial deformation of rotating surfaces is of great significance for the design and development of rotating machinery.

[0003] Reflective fiber optic displacement sensors are widely used in non-contact displacement measurement due to their advantages such as small size, high accuracy, strong anti-interference, and long lifespan. The sensor uses a continuous light source as the measurement carrier, optical fiber as the propagation medium, and light intensity as the measurement signal. Its working principle lies in sensing the displacement of the measured object by utilizing the relationship between the amount of light received by the receiving fiber and the distance to the measured object. The amount of reflected light received by the sensor is easily affected by the surface characteristics of the measured object, such as material, shape, and roughness. Therefore, reflective fiber optic displacement sensors must undergo rigorous calibration before use.

[0004] Rotating components such as rotating disks, rotating shafts, rotating grates, rotating drums, and rotating conical walls are typical rotating surfaces in aero-engines and gas turbines, characterized by continuous rotation. Static calibration platforms for displacement sensors cannot account for the impact of the measured surface's rotation on the amount of light received. Applying static calibration curves to radial displacement testing of rotating surfaces may introduce immeasurable errors, reducing the reliability of measurement results. Existing dynamic calibration platforms for displacement sensors are often specifically designed for a particular testing scenario, such as blade tip clearance testing in compression machinery or turbine machinery. The discrete rotation of the measured object cannot simulate the impact of a continuously rotating surface on the amount of reflected light, and therefore cannot be used as a general-purpose platform for the rotational calibration of reflective fiber optic displacement sensors.

[0005] To address this issue, a sensor calibration device for measuring radial deformation of a rotating surface is proposed. Summary of the Invention

[0006] The present invention aims to provide a sensor calibration device for measuring radial deformation of a rotating surface, so as to solve or improve at least one of the above-mentioned technical problems.

[0007] In view of this, a first aspect of the present invention is to provide a sensor calibration device for measuring radial deformation of a rotating surface.

[0008] A second aspect of the present invention is to provide a sensor calibration method for measuring radial deformation of a rotating surface.

[0009] A first aspect of the present invention provides a sensor calibration device for measuring radial deformation of a rotating surface, comprising: a stand on which a motor and a frequency converter are mounted, wherein the output shaft of the motor is in the Z direction, and a calibrated tooth is coaxially fixed on the output shaft of the motor, and the frequency converter is used to adjust the rotational speed of the motor; a displacement calibration assembly comprising an X-direction guide rail fixed on the stand, a Z-direction guide rail fixed on a slider of the X-direction guide rail, and a precision displacement adjustment mechanism fixed on the slider of the Z-direction guide rail; and a reflective fiber optic displacement sensor disposed on the moving end of the precision displacement adjustment mechanism, wherein the probe of the reflective fiber optic displacement sensor is disposed along the X direction and points towards the axis of the output shaft of the motor.

[0010] The present invention provides a sensor calibration device for measuring radial deformation of a rotating surface. The controller adjusts the speed of the motor, and then the calibrated tooth to be calibrated is coaxially installed at the output end of the motor. The calibrated tooth can be detected by the probe of the reflective fiber optic displacement sensor at different speeds. The obtained calibration curve fully considers the influence of the rotating calibrated surface on the sensor, and no secondary correction is required.

[0011] It can also inspect axisymmetric workpieces of different sizes and shapes. The calibration device has a simple structure, is easy to use and maintain, and is compatible with calibration objects of different radii and heights, making it widely applicable.

[0012] During the rotation measurement of the calibrated tooth, the speed of the motor is adjusted by the controller, so that the rotation speed of the calibrated surface can be adjusted, and multiple continuous calibrations of the calibrated surface at different speeds can be achieved, which greatly improves the calibration efficiency.

[0013] In addition, the technical solutions provided by embodiments of the present invention may also have the following additional technical features:

[0014] In any of the above technical solutions, the displacement calibration assembly further includes: a sensor support frame, disposed at the connection between the X-direction guide rail slider and the Z-direction guide rail, for fixing the Z-direction guide rail; a sensor fixing block, installed at the connection between the moving end and the reflective fiber optic displacement sensor, so that the moving end can drive the probe of the reflective fiber optic displacement sensor to move along the X-direction; and a Z-direction guide rail locking handle, disposed on the slider of the Z-direction guide rail, for controlling the fixing or movement of the Z-direction guide rail slider.

[0015] In this technical solution, a sensor support frame is set up to connect the X-direction guide rail slider and the Z-direction guide rail. This facilitates drilling and assembly, and allows for adjustments based on actual assembly and testing point requirements, so that the probe of the reflective fiber optic displacement sensor can be more accurately aligned with the tooth to be calibrated.

[0016] By setting a sensor fixing block, the reflective fiber optic displacement sensor probe is mounted on the slider of the Z-direction guide rail. By using the sensor fixing block to be aligned with the slider of the Z-direction guide rail first, the installation hole position of the slider of the Z-direction guide rail can be avoided from affecting the measurement of the probe, thus improving the adjustability of the probe installation.

[0017] Adding a locking handle to the Z-axis guide rail can enhance the stability of the slider after position adjustment, preventing movement during probe measurement and increasing measurement error.

[0018] In any of the above technical solutions, an X-direction guide rail knob is installed at the end of the lead screw of the X-direction guide rail; and / or a Z-direction guide rail knob is installed at the end of the lead screw of the Z-direction guide rail.

[0019] In this technical solution, an X-direction guide rail knob is added to the end of the lead screw of the X-direction guide rail, and a Z-direction guide rail knob is added to the end of the lead screw of the Z-direction guide rail. This allows for convenient direct adjustment by hand and enables multiple adjustments during and before measurement, providing room for operability.

[0020] In any of the above technical solutions, the stand is provided with a through hole for the motor to pass through, the motor is fixed on the stand by a heightening bracket, and the heightening bracket covers the through hole; wherein, the motor and the heightening bracket are fixed by bolts, and the axis of the bolts is parallel to the output shaft axis of the motor.

[0021] In this technical solution, the motor is installed by opening a through hole in the test bench, allowing the motor to be longitudinally mounted on the test bench so that the output shaft of the motor can be set longitudinally along the Z-axis. An extension bracket is used to fix and assemble the motor housing to the top. Then, the extension bracket is placed on the through hole of the test bench. This can prevent the heat emitted by the motor from directly contacting the calibrated teeth or probe, reduce the influence of temperature during long-term testing, and improve the accuracy of measurement.

[0022] Aligning the bolt's axis with the motor's output shaft axis ensures that the fixing force applied to the motor does not create an angle with the motor's output shaft. This also prevents the motor from creating an angle with the output shaft's axis when applying force to rotate the internal output shaft. Furthermore, it ensures that the output shaft does not move eccentrically when rotating the calibrated tooth, thus making the measurement of the calibrated tooth by the reflective fiber optic displacement sensor more accurate.

[0023] In any of the above technical solutions, the tooth to be calibrated is fitted onto the output shaft of the motor through an internally provided reducing sleeve. A bushing is provided inside the tooth to be calibrated, and a locking nut is screwed to the end of the output shaft of the motor. The locking nut presses the bushing with a washer to fix the tooth to be calibrated onto the reducing sleeve. The bottom of the outer wall of the reducing sleeve is provided with an extension edge, and the bottom of the tooth to be calibrated abuts against the extension edge. The washer is a metal annular plate.

[0024] In this technical solution, by using a reduced-diameter sleeve on the tooth to be calibrated and the motor output shaft for a set time, it is possible to fix the tooth to be calibrated and the motor output shaft when they cannot be assembled. Moreover, the sleeve method does not use a key connection. On the one hand, the direct sleeve installation is simpler and more convenient. On the other hand, it can avoid the eccentric force caused by uneven force due to key connection, so that the object being tested rotates more accurately around the axis and increases the measurement accuracy.

[0025] By using a locking nut and washer to press the bushing, the grating teeth to be calibrated are firmly fixed on the reducing sleeve and further fixed on the motor output shaft. Static friction is used to prevent relative rotation between the motor output shaft and the reducing sleeve, bushing and grating teeth to be calibrated.

[0026] The gasket is a metal ring-shaped sheet, specifically made of stainless steel, to avoid excessive deformation and ensure the pressing effect on the bushing.

[0027] In any of the above technical solutions, the inner wall and outer wall of the bushing are respectively coaxially provided with rings. The rings located on the outer wall are horizontally overlapped on the upper surface of the grating teeth to be calibrated and are fixed by longitudinal bolt insertion. The rings located on the inner wall are disposed between the gasket and the grating teeth to be calibrated.

[0028] In this technical solution, by coaxially providing rings on the inner and outer walls of the bushing, the single-sided shape of the longitudinal section of the bushing is Z-shaped, and the middle part is perpendicular to the upper and lower sides.

[0029] The ring on the outer wall is horizontally overlapped on the upper surface of the tooth to be calibrated and fixed by longitudinal bolt insertion. While having a close static friction force, the longitudinal drilling and bolting method further increases the stability of the fixation and avoids the occurrence of relative slippage.

[0030] The ring located on the inner wall is positioned between the washer and the calibrated teeth, so that the locking nut can be longitudinally locked by passing through the washer, bushing, calibrated teeth and reducing sleeve in sequence. The outer wall of the middle part of the bushing fits into the calibrated teeth, ensuring a firm final fixation and stability during rotation.

[0031] In any of the above technical solutions, the inner wall of the ring body located on the inner wall and the inner wall of the tooth to be calibrated are respectively fitted with the outer wall of the reducing sleeve with clearance; and / or the bushing and the tooth to be calibrated are installed with an interference fit using a heat fitting process.

[0032] In this technical solution, the clearance fit assembly method can facilitate the quick assembly and disassembly of the reducing sleeve and the calibrated tooth, so as to quickly assemble and measure different measurement objects. After installation and fitting, it is necessary to check and adjust the coaxiality between the calibrated tooth and the motor output shaft, with a circular runout of less than 5μm.

[0033] Using a heat-fitting process for interference fit installation ensures that the inner wall of the tooth to be calibrated fits tightly against the outer wall of the bushing, guaranteeing a secure connection between the two.

[0034] In any of the above technical solutions, the reducing sleeve is provided with a tapered hole, and the output shaft of the motor is provided with a tapered surface that matches the tapered hole; wherein, the distance between the upper edge of the tapered surface and its axis is less than the distance between the lower edge of the tapered surface and its axis.

[0035] In this technical solution, since the output shaft of the motor is arranged longitudinally, a tapered surface adapted to the tapered hole is provided on the output shaft, which allows the reducing sleeve to be tightly fitted and fixed together with the output shaft of the motor under the action of external force and its own weight, thus avoiding relative rotation between the two.

[0036] The distance between the upper edge of the tapered surface and its axis is less than the distance between the lower edge of the tapered surface and its axis, which makes it easier to install the reducing sleeve from top to bottom. In addition, the distance between the upper edge of the tapered surface and its axis is greater than the distance between the outermost end of the thread on the motor output shaft used to screw into the lock nut and the output shaft.

[0037] The second aspect of the present invention provides a sensor calibration method for measuring radial deformation of a rotating surface, implemented by the apparatus described in any of the technical solutions of the first aspect, comprising the following steps: S1, adjusting the X-direction guide rail, determining the height of the reflective fiber optic displacement sensor probe on the sensor fixing block according to the thickness of the tooth to be calibrated, and locking the X-direction guide rail; S2, adjusting the Z-direction guide rail, determining the distance between the probe and the surface of the tooth to be calibrated according to the radius of the tooth to be calibrated, and locking the Z-direction guide rail; S3, determining the zero-point position, placing the probe against the surface of the tooth to be calibrated, and recording the output signal of the reflective fiber optic displacement sensor at the zero-point position; S4, determining the rotation calibration starting point, and adjusting the precision displacement adjustment mechanism. S5. Move the reflective fiber optic displacement sensor probe away from the surface of the tooth to be calibrated, and then stop recording the starting point position of the rotational calibration; S6. Install the tooth to be calibrated on the output shaft of the motor, then start the motor, adjust the speed through the frequency converter, and record the output signal of the reflective fiber optic displacement sensor at the starting point of the rotational calibration after the speed stabilizes; S7. Adjust the precision displacement adjustment mechanism to move the reflective fiber optic displacement sensor probe further away from the surface of the tooth to be calibrated, record the movement position of the reflective fiber optic displacement sensor probe and the output signal of the reflective fiber optic displacement sensor, and repeat the operation until the upper limit of the range of the reflective fiber optic displacement sensor is reached; S8. Connect all calibration points in sequence to obtain the rotational calibration curve.

[0038] The sensor calibration method for measuring radial deformation of a rotating surface provided by the technical solution of the present invention includes method steps that can realize any of the above technical solutions. Therefore, the sensor calibration method for measuring radial deformation of a rotating surface provided by the second aspect of the present invention has all the technical effects of a sensor calibration device for measuring radial deformation of a rotating surface, which will not be repeated here.

[0039] In any of the above technical solutions, the speed range of the motor adjusted by the frequency converter in step S is 0 rpm to 500 rpm.

[0040] In this technical solution, the motor speed is set within a certain range, selected according to the actual speed of the object being calibrated, which can prevent slippage caused by the high-speed rotation of the motor.

[0041] The beneficial effects of this invention compared to the prior art are as follows:

[0042] The calibrated surface is rotated by a motor, and the resulting calibration curve fully considers the influence of the rotating calibrated surface on the sensor. No secondary correction is required, and it can be directly used for dynamic real-time measurement of radial deformation of rotating surfaces such as rotating disks, rotating shafts, rotating grates, rotating drums, and rotating cone walls.

[0043] The rotation speed of the calibrated surface is adjustable, which can realize multiple continuous calibrations of the calibrated surface at different rotation speeds, greatly improving calibration efficiency;

[0044] The calibration device has a simple structure, is easy to use and maintain, and is compatible with calibration objects of different radii and heights, making it widely applicable.

[0045] Additional aspects and advantages of embodiments of the invention will become apparent in the following description or may be learned by practice of embodiments of the invention. Attached Figure Description

[0046] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0047] Figure 1 A side view of the rotating dynamic calibration device for a reflective fiber optic displacement sensor equipped with rotating grating teeth to be calibrated according to the present invention.

[0048] Figure 2 This is a side view of the rotary dynamic calibration device for a reflective fiber optic displacement sensor with a calibration rotating disk according to the present invention.

[0049] Figure 3 This is a top view of the rotary dynamic calibration device for a reflective fiber optic displacement sensor equipped with a calibration rotating disk according to the present invention.

[0050] in, Figure 1-3 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0051] 1. Casters, 2. Frame, 3. Motor, 4. Elevator, 5. Grate to be calibrated, 6. Reducing sleeve, 7. Locking nut, 8. Washer, 9. Z-direction guide rail knob, 10. Z-direction guide rail, 11. Sensor fixing block, 12. Precision displacement adjustment mechanism, 13. Z-direction guide rail locking handle, 14. Reflective fiber optic displacement sensor, 15. Sensor support frame, 16. X-direction guide rail, 17. X-direction guide rail knob, 18. Frequency converter, 19. Calibration object to be measured, 20. Large washer. Detailed Implementation

[0052] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0053] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0054] Example 1

[0055] Please see Figure 1-3 The present invention proposes a sensor calibration device for measuring radial deformation of a rotating surface, comprising: a reflective fiber optic displacement sensor 14, a displacement calibration assembly, a calibration object 19 with a rotating surface, and a test stand 2.

[0056] Reflective fiber optic displacement sensor 14: The probe of the reflective fiber optic displacement sensor 14 is connected to the precision displacement adjustment mechanism 12 through the sensor fixing block 11. The distance between the probe of the reflective fiber optic displacement sensor 14 and the calibrated rotating surface can be precisely adjusted using the precision displacement adjustment mechanism 12.

[0057] Displacement calibration assembly: Fixed on the stand 2, it includes an X-direction guide rail 16 and a Z-direction guide rail 10, allowing adjustment of the horizontal and vertical positions of the sensor fixing block 11. The sensor fixing block 11 directly cooperates with the precision displacement adjustment mechanism 12, which controls the precise movement of the sensor fixing block 11 along the radius of the calibration object 19. The design of the X-direction guide rail 16 and the Z-direction guide rail 10 allows the device to be compatible with various sizes of calibration objects 19 (calibrated grating teeth 5 and calibration discs). The X-direction guide rail 16... Figure 1 , Figure 2 and Figure 3 The markings indicate the distance between the probe of the reflective fiber optic displacement sensor 14 and the calibration object 19 to be measured, allowing the device to adapt to calibration objects 19 of different radii. Simultaneously, the Z-direction guide rail 10... Figure 1 and Figure 2 The markings indicate that the fixed height of the probe of the reflective fiber optic displacement sensor 14 is adjusted so that the device can adapt to calibration objects 19 of different thicknesses.

[0058] The calibration object 19 to be tested has a rotating curved surface, such as a rotating comb, a rotating disk, or a rotating cone wall. It is connected to the motor 3 through a reducing sleeve 6. The motor 3 directly drives the calibration object 19 to rotate. Its rotation speed is controlled by the frequency converter 18. The motor 3, including the frequency converter 18, is used to drive the calibration object 19 to rotate. It simulates the influence of the continuously rotating test surface on the amount of reflected light received by the reflective fiber optic displacement sensor 14, so that the device has the function of dynamic rotation calibration. The housing of the motor 3 is mounted on the platform 2 through the heightening bracket 4.

[0059] Frame 2: Used to support motor 3, frequency converter 18, and displacement calibration assembly, so that they are stably placed on the ground. Frame 2 has sufficient rigidity and stability.

[0060] Furthermore, the axial direction of the reflective fiber optic displacement sensor 14 is perpendicular to and intersects with the rotation axis of the calibration object 19, that is, the axial direction of the reflective fiber optic displacement sensor 14 coincides with one radial direction of the calibration object 19.

[0061] Furthermore, the calibration object 19 with the rotating surface is driven to rotate by the motor 3 controlled by the frequency converter 18, and the rotation speed can be continuously adjusted.

[0062] Furthermore, the displacement calibration assembly includes an X-direction guide rail 16 and a Z-direction guide rail 10, which have displacement adjustment capabilities in both vertical and horizontal directions and can be compatible with calibration objects 19 of different radii and thicknesses. The Z-direction guide rail 10 is provided with a Z-direction guide rail knob 9 for adjusting its slidingly mounted slider, and the X-direction guide rail 16 is provided with an X-direction guide rail knob 17 for adjusting its slidingly mounted slider.

[0063] Furthermore, the precision displacement adjustment mechanism 12 can make minute and accurate adjustments to the position of the sensor fixing block 11, controlling the distance between the probe of the reflective fiber optic displacement sensor 14 and the calibrated rotating surface, thereby obtaining the calibration curve.

[0064] Furthermore, the Z-direction guide rail locking handle 13 can fix the sensor fixing block 11 on the Z-direction guide rail 10 when the sensor fixing block 11 on the Z-direction guide rail 10 slides to the appropriate position.

[0065] Furthermore, the precision displacement adjustment mechanism 12 is used to precisely adjust the horizontal position of the displacement sensor, thereby changing the X-direction distance between the sensor probe and the surface of the calibration object 19 to be tested. After multiple adjustments, a correspondence between the displacement and the sensor output electrical signal can be formed, and the obtained dynamic calibration curve can be directly applied to the rotary tooth gap test.

[0066] Furthermore, the sensor fixing block 11 is used to fix the reflective fiber optic displacement sensor 14, so that the axial direction of the probe of the reflective fiber optic displacement sensor 14 is aligned with the radial direction of the calibration object 19 to be measured. At the same time, the sensor fixing block 11 is connected to the moving end of the precision displacement adjustment mechanism 12. When the precision displacement adjustment mechanism 12 is adjusted, the sensor fixing block 11 drives the probe of the reflective fiber optic displacement sensor 14 to move precisely along the X direction.

[0067] Furthermore, the sensor support frame 15 is connected to the X-direction guide rail 16 and the Z-direction guide rail 10 to support the sensor fixing block 11.

[0068] Furthermore, the reducing sleeve 6 is responsible for the transition connection between the mating surface of the motor 3 shaft and the mating surface of the calibration object 19 to be tested, so that the device can calibrate different calibration objects 19 to be tested. The end of the motor 3 shaft is provided with a thread that mates with the locking nut 7. The reducing sleeve 6 and the locking nut 7 work together to assemble the calibration object 19 to be tested.

[0069] Furthermore, a gasket 8 or a large gasket 20 composed of multiple gaskets 8 stacked together is provided between the reducing sleeve 6 and the locking nut 7. The number of gaskets 8 included in the large gasket 20 is determined according to the shape of the calibration object 19 to be tested, so as to ensure a firm and stable assembly.

[0070] Furthermore, the calibration object 19 to be measured by this device, such as a rotating disk, rotating shaft, rotating grating, rotating drum, rotating cone wall, etc., is designed with a diameter reduction sleeve 6 according to the shape of the mating surface of the calibration object 19 to be measured, so as to adapt to the rotating shaft of the motor 3, and the motor 3 directly drives the calibration object 19 to be measured to rotate.

[0071] Furthermore, the platform 2 has sufficient rigidity to effectively support the device, thereby isolating it from external interference. The platform 2 has four casters 1 and caster holders underneath, which facilitates the movement and fixation of the platform 2.

[0072] Furthermore, the thickness of the gasket 8 is not less than 5 mm, and the thickness of the lower edge of the reducing sleeve 6 is not less than 6 mm, and the thickness of the lower edge of the reducing sleeve 6 is greater than that of the gasket 8.

[0073] The angle Q between the generatrix of the tapered hole on the inner side of the reducing sleeve 6 and the axis is 2° to 5°, and the outer wall of the bushing is tapered with the generatrix of the tapered surface and the axis being 2° to 5°. The opening directions of Q and P are opposite. After the inner diameter of the grating tooth 5 to be calibrated expands due to heat, the bushing is inserted into the inner wall of the grating tooth 5 to be calibrated from top to bottom, and is sleeved with the reducing sleeve 6 before the grating tooth 5 to be calibrated cools down. The inner diameter of the grating tooth 5 to be calibrated hugs the bushing and presses the inner wall of the bushing into the reducing sleeve 6, ensuring the stability and firmness of the assembly, and further improving the coaxiality with the rotating shaft of the motor 3 during the rotation of the grating tooth 5 to be calibrated.

[0074] The ratio of the contact area between the inner wall ring and the reducing sleeve 6 to the contact area between the inner wall of the tooth 5 to be calibrated and the reducing sleeve 6 is 0.35-0.70, and the preferred ratio is 0.50.

[0075] Working principle:

[0076] (1) Fix the frame 2, lock the casters 1, and adjust the caster 1 fixing device to keep the guide rail mounting platform on the frame 2 level. A level can be used to assist in the inspection.

[0077] (2) Install motor 3, ensuring that the shaft of motor 3 is in the vertical direction and perpendicular to the mounting plane of X-direction guide rail 16. The outer casing of motor 3 is mounted on the platform 2 through the lifting frame 4.

[0078] (3) Figure 1 , Figure 2 and Figure 3 As shown, install the guide rails, ensuring that the X-direction guide rail 16 is in the X-direction, as shown. Figure 1 and Figure 2 As shown, the Z-direction guide rail 10 is located in the Z-direction, as... Figure 3 As shown, during installation, adjust the X-direction guide rail 16 to the Y-direction position to ensure that the probe mounting hole of the reflective fiber optic displacement sensor 14 on the sensor fixing block 11 is aligned with the radius direction of the calibration object 19 to be measured.

[0079] (4) Adjust the Z-direction guide rail 10, determine the height of the sensor fixing block 11 according to the thickness of the calibration object 19 to be measured, and lock the Z-direction guide rail 10.

[0080] (5) Adjust the X-direction guide rail 16, determine the distance between the sensor fixing block 11 and the calibrated surface according to the radius of the calibration object 19, and lock the X-direction guide rail 16.

[0081] (6) Determine the zero point position, gently place the probe of the reflective fiber displacement sensor 14 against the surface of the calibration object 19 to be measured, tighten the sensor fixing knob on the sensor fixing block 11, and record the sensor output signal of the zero point position.

[0082] (7) Determine the starting point of rotation calibration, adjust the knob of the precision displacement adjustment mechanism 12, and slowly move the probe of the reflective fiber optic displacement sensor 14 away from the surface of the calibration object 19 to be measured. After moving to a suitable position, record the position of the starting point of rotation calibration.

[0083] (8) Start motor 3, adjust to a suitable speed, and record the output signal of reflective fiber optic displacement sensor 14 after the speed stabilizes;

[0084] (9) Adjust the knob of the precision displacement adjustment mechanism 12 so that the probe of the reflective fiber optic displacement sensor 14 moves away from the surface of the calibration object 19 again, and record the probe movement position and sensor output signal of the reflective fiber optic displacement sensor 14.

[0085] (10) Repeat step (9) until the upper limit of the range of the reflective fiber optic displacement sensor 14 is reached.

[0086] (11) Connect all calibration points in sequence to obtain the rotation calibration curve.

[0087] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to 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 invention.

[0088] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A sensor calibration device for measuring radial deformation of a surface of revolution, characterized in that, include: A test stand (2) is provided with a motor (3) and a frequency converter (18). The output shaft of the motor (3) is in the Z direction. A calibrated tooth (5) is coaxially fixed on the output shaft of the motor (3). The frequency converter (18) is used to adjust the speed of the motor (3). The displacement calibration assembly includes an X-direction guide rail (16) fixed on the stand (2), a Z-direction guide rail (10) fixed on the slider of the X-direction guide rail (16), and a precision displacement adjustment mechanism (12) fixed on the slider of the Z-direction guide rail (10). A reflective fiber optic displacement sensor (14) is disposed on the moving end of the precision displacement adjustment mechanism (12). The probe of the reflective fiber optic displacement sensor (14) is disposed along the X direction and points to the output shaft axis of the motor (3). The calibrated tooth (5) is fitted onto the output shaft of the motor (3) by an internally provided reducing sleeve (6). The calibrated tooth (5) is fitted with a bushing inside. A locking nut (7) is screwed to the end of the output shaft of the motor (3). The locking nut (7) presses the bushing with a washer (8) so that the calibrated tooth (5) is fixed on the reducing sleeve (6). The reducing sleeve (6) has an extension edge at the bottom of its outer wall, the bottom of the tooth to be calibrated (5) abuts against the extension edge, and the gasket (8) is a metal annular sheet. The inner and outer walls of the bushing are respectively provided with rings on the same axis, so that the single-sided shape of the longitudinal section of the bushing is Z-shaped, and the middle part is perpendicular to the upper and lower sides; the ring on the outer wall is horizontally overlapped on the upper surface of the grating tooth (5) to be calibrated, and is fixed by bolt longitudinal insertion; the ring on the inner wall is located between the gasket (8) and the grating tooth (5) to be calibrated. The inner wall of the ring located on the inner wall and the inner wall of the calibrated tooth (5) are respectively fitted with the outer wall of the reducing sleeve (6) with clearance; and / or The bushing and the calibrated tooth (5) are installed by interference fit using a heat fitting process; The reducing sleeve (6) has a tapered hole, and the output shaft of the motor (3) has a tapered surface that matches the tapered hole.

2. The sensor calibration device for measuring radial deformation of a surface of revolution according to claim 1, characterized in that, The displacement calibration assembly also includes: A sensor support frame (15) is provided at the connection between the slider of the X-direction guide rail (16) and the Z-direction guide rail (10) for fixing the Z-direction guide rail (10); A sensor fixing block (11) is installed at the connection between the mobile end and the reflective fiber optic displacement sensor (14) so ​​that the mobile end can drive the probe of the reflective fiber optic displacement sensor (14) to move along the X direction. The Z-direction guide rail locking handle (13) is provided on the slider of the Z-direction guide rail (10) and is used to control the fixing or movement of the slider of the Z-direction guide rail (10).

3. The sensor calibration device for measuring radial deformation of a surface of revolution according to claim 1, characterized in that, The lead screw end of the X-direction guide rail (16) is equipped with an X-direction guide rail knob (17); and / or The Z-direction guide rail (10) has a Z-direction guide rail knob (9) installed at the end of the lead screw.

4. A sensor calibration device for measuring radial deformation of a surface of revolution according to claim 1, characterized in that, The platform (2) has a through hole for the motor (3) to pass through. The motor (3) is fixed on the platform (2) by a heightening seat (4), and the heightening seat (4) covers the through hole. The motor (3) and the heightening seat (4) are fixed together by bolts, and the axis of the bolts is parallel to the output shaft axis of the motor (3).

5. A calibration method for a reflective fiber optic displacement sensor calibration device according to any one of claims 1-4, characterized in that, Includes the following steps: S1, adjust the X-direction guide rail (16), determine the height of the reflective fiber displacement sensor (14) probe on the sensor fixing block (11) according to the thickness of the grating tooth (5) to be calibrated, and lock the X-direction guide rail (16). S2, adjust the Z-direction guide rail (10), determine the distance between the probe and the surface of the tooth to be calibrated (5) according to the radius of the tooth to be calibrated (5), and lock the Z-direction guide rail (10); S3, determine the zero point position, place the probe against the surface of the tooth to be calibrated (5), and record the output signal of the reflective fiber displacement sensor (14) at the zero point position; S4, determine the starting point of rotation calibration, adjust the precision displacement adjustment mechanism (12) to make the probe of the reflective fiber displacement sensor (14) move away from the surface of the tooth to be calibrated (5), and then stop recording the position of the starting point of rotation calibration. S5, install the tooth to be calibrated (5) on the output shaft of the motor (3), then start the motor (3), adjust the speed through the frequency converter (18), and record the output signal of the reflective fiber displacement sensor (14) at the starting point of rotation calibration after the speed stabilizes. S6, adjust the precision displacement adjustment mechanism (12) to move the probe of the reflective fiber displacement sensor (14) further away from the surface of the tooth to be calibrated (5), record the moving position of the probe of the reflective fiber displacement sensor (14) and the output signal of the reflective fiber displacement sensor (14), repeat the operation until the upper limit of the range of the reflective fiber displacement sensor (14) is reached. S7, connect all calibration points in sequence to obtain the rotation calibration curve.

6. A sensor calibration method for measuring radial deformation of a surface of revolution according to claim 5, characterized in that, In step S5, the frequency converter (18) adjusts the speed range of the motor (3) to 0 rpm - 500 rpm.

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