Spectral confocal sealing labyrinth chamfer arc radius measuring device and method

Abstract

The invention discloses a spectrum confocal sealing labyrinth chamfer arc radius measuring device and method, and the device comprises a point spectrum displacement module, a point spectrum measuring instrument, an end cover rotating device, an end cover, an end cover Y-axis-around angle adjusting motor, an end cover Z-axis-around angle adjusting motor, and an end cover inner supporting clamping jaw. The method comprises the following steps: S1, carrying out displacement measurement and spectral measurement by the point spectral displacement module; s2, an end cover rotating device adjusts the angle of the end cover around the Y axis and the Z axis; and S3, measuring the distance and the fitting arc radius by the point spectrum measuring instrument. The device is used for measuring the distance between a target object and a measuring system, high-precision measurement is achieved by analyzing the wavelength or frequency spectrum characteristics of light, and the problems of high reflectivity and shielding are solved through the fact that the light of the confocal sensor is coaxial with the measuring axis.

Description

Technical Field

[0001] The invention relates to the field of measuring the chamfered arc of sealing grate teeth, and in particular to a spectral confocal sealing grate teeth chamfered arc radius measuring device and method. Background Art

[0002] In the field of arc radius measurement, traditional non-contact measurement methods such as diameter gauges, 3D line laser scanners, point laser ranging sensors and 3D structured light cameras have certain limitations.

[0003] The reasons why the diameter gauge and coaxial light projection measurement are not suitable for arc measurement of disc parts are: 1. Disk parts are relatively large, and conventional projection measurement will produce large errors at long distances; 2. The inclination angle of the comb teeth will block the arc and affect the projection effect.

[0004] Challenges faced by 3D line laser scanners, point laser ranging sensors, and 3D structured light cameras when using triangulation include: 1. The high reflectivity of engine disc parts will significantly reduce the measurement accuracy; 2. The presence of the comb teeth limits the angles of light entering and exiting, resulting in the sensor being unable to effectively receive data when measuring arcs such as deep holes. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned technical problems and to propose a spectral confocal sealing comb tooth chamfer arc radius measurement device and method, which, in combination with a confocal sensor, achieves high-precision arc radius measurement.

[0006] A spectral confocal sealing comb tooth chamfer arc radius measuring device, comprising a point spectrum displacement module, a point spectrum measuring instrument, and an end cover rotating device; The point spectrum displacement module measures the position of the probe relative to the object being measured, detects small displacement changes in the vertical direction, and obtains the geometric characteristics of the arc; The point spectrum measuring instrument performs actual arc radius measurement; The end cap rotating device provides rotational movement of the end cap around the Y axis and the Z axis, and comprehensively measures the arc from different angles; The point spectrum displacement module is connected to the point spectrum measuring instrument, and the spectrum displacement module and the point spectrum measuring instrument are both arranged above the end cover rotating device.

[0007] Furthermore, a spectral confocal sealing comb tooth chamfer arc radius measuring device, the point spectrum displacement module is driven by a servo motor, and the point spectrum displacement module includes a position sensor and a closed-loop control system; The point spectrum displacement module obtains different measurement positions through a position sensor and controls and adjusts the position through a closed-loop control system.

[0008] Furthermore, a spectral confocal sealing comb tooth chamfer arc radius measuring device, the end cover rotating device includes an end cover, an end cover angle adjustment motor around the Y axis, an end cover angle adjustment motor around the Z axis, and an end cover inner support clamp; The end cover inner support clamping claw clamps and fixes the end cover, and the end cover inner support clamping claw is arranged at the center position of the end cover; The end cover angle adjustment motor around the Y axis adjusts the angle of the end cover around the Y axis to cover the measurement angle of the Y axis; The end cover angle adjustment motor around the Z axis adjusts the angle of the end cover around the Z axis to cover the measurement angle of the Z axis; The end cover is connected to the lower end of the end cover for adjusting the angle of the motor around the Z axis, and the end cover is connected to the end cover for adjusting the angle of the motor around the Y axis.

[0009] Furthermore, a spectral confocal sealing comb tooth chamfer arc radius measuring device is provided, wherein the probe of the point spectrum measuring instrument is a confocal sensor.

[0010] A spectral confocal sealing comb tooth chamfer arc radius measurement method comprises the following sub-steps: S1: Point spectrum displacement module (1) performs displacement measurement and spectrum measurement; S2: The end cover rotating device (2) adjusts the angle of the end cover (4) around the Y axis and the Z axis; S3: Point spectrum measuring instrument (2) measures distance and fitted arc radius.

[0011] Furthermore, a spectral confocal sealing comb tooth chamfer arc radius measurement method, the step S1 includes the following sub-steps: S11: The point spectrum displacement module (1) performs displacement measurement and calculates the displacement amount. The formula is: ; in, represents the displacement, represents the actual measured distance, represents the reference distance for calibration; S12: The point spectrum shift module (1) performs spectrum measurement and calculates the spectrum intensity. The formula is: ; in, represents the measured spectral intensity, represents the incident spectral intensity, represents the absorption coefficient, Represents the path length.

[0012] Furthermore, a spectral confocal sealing comb tooth chamfer arc radius measurement method, the step S2 comprises the following sub-steps: S21: The angle of the end cap (4) around the Y axis is obtained by adjusting the motor (5) around the Y axis through the end cap. The formula is: ; in, Represents the angle of the end cap around the Y axis, Represents the current Y-axis rotation steps, Represents the total number of steps; S22: The angle of the end cap (4) around the Z axis is obtained by adjusting the motor (6) around the Z axis through the end cap. The formula is: ; in, Represents the angle of the end cap around the Z axis, Represents the current Z-axis rotation steps. Represents the total number of steps.

[0013] Furthermore, a spectral confocal sealing comb tooth chamfer arc radius measurement method, step S3 includes the following sub-steps: S31: Distance measurement by confocal sensor, the formula is: ; in, Represents the measured distance, represents the focal length, stands for diffraction limit; S32: Use the least squares method to fit the arc. The data points approximately fall on a circle. To fit the arc with the minimum loss, iterate to find the optimal solution. The formula is: ; in, represents the coordinates of the center of the circle, represents the circle radius, m represents the number of data points, i=1, 2…m, Represents the coordinates of the data point.

[0014] The beneficial effects of the present invention are as follows: a spectral confocal sealing comb tooth chamfer arc radius measuring device and method are used to measure the distance between a target object and a measuring system, and high-precision measurement is achieved by analyzing the wavelength or spectrum characteristics of light; a high-precision position sensor and a closed-loop control system are equipped to achieve accurate position control and adjustment; the confocal sensor light is coaxial with the measuring axis, which is suitable for dealing with high reflectivity and occlusion problems; the clamping jaws provide uniform clamping force to avoid displacement or deformation of the end cover during the measurement process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a structural diagram of the comb teeth.

[0016] Figure 2 This is a structural diagram of the chamfered corners of the comb teeth.

[0017] Figure 3 The present invention is a structural diagram of a spectral confocal sealing comb tooth chamfer arc radius measuring device.

[0018] Figure 4 The present invention is an assembly diagram of a spectral confocal sealing comb tooth chamfer arc radius measuring device.

[0019] In the figure, 1-point spectrum displacement module, 2-point spectrum measuring instrument, 3-end cover rotating device, 4-end cover, 5-end cover angle adjustment motor around Y axis, 6-end cover angle adjustment motor around Z axis, 7-end cover inner support clamp. DETAILED DESCRIPTION

[0020] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0021] 1. Demand background: As attached Figure 1 As shown, the sealing grate is a sealing device commonly used between the engine cylinder head and the engine body. Its main function is to prevent the leakage of engine oil, coolant and high-temperature gas to ensure the normal operation of the engine. The sealing grate is mainly composed of a metal frame and sealing materials. The sealing materials are generally high-temperature elastic materials, such as graphite, rubber, etc.

[0022] According to the manufacturing process requirements, it is necessary to ensure that Figure 2 The chamfers at the two circles shown are within the specified tolerance range. Due to the small chamfer radius, inclined angle, surrounding obstructions, small center angle and other factors, it is difficult to measure the chamfer radius using conventional means. Even if the measurement is barely possible, the accuracy is not high.

[0023] 2. Device structure: As attached Figure 3~4 As shown, a spectral confocal sealing comb tooth chamfer arc radius measuring device includes a point spectrum displacement module 1, a point spectrum measuring instrument 2, and an end cover rotating device 3.

[0024] 2.1 point spectrum shift module 1 Function: Provide high-precision displacement measurement to ensure accurate arc data at different measurement positions.

[0025] Structure: The point spectrum displacement module 1 integrates a spectrum analysis unit, which is used to measure the position of the probe relative to the object being measured. It can accurately detect small displacement changes in the vertical direction, thereby obtaining the geometric characteristics of the arc.

[0026] Drive mode: Choose servo motor for driving to ensure the accuracy and repeatability of lifting.

[0027] Control system: Equipped with high-precision position sensors and closed-loop control systems to achieve accurate position control and adjustment.

[0028] Displacement measurement: ; in, represents the displacement, represents the actual measured distance, Represents the reference distance for calibration.

[0029] Spectral measurements: ; in, represents the measured spectral intensity, represents the incident spectral intensity, represents the absorption coefficient, Represents the path length.

[0030] 2.2 End cover rotating device 3 Function: Provide the end cover 4 with rotational movement around the Y-axis and the Z-axis to ensure that the arc can be fully measured from different angles. At the same time, the end cover inner support jaw 7 is used to fix the end cover 4 to prevent it from moving during the measurement process.

[0031] End cover angle adjustment motor 5 around the Y axis: used to adjust the angle of the end cover 4 around the Y axis to cover different measurement angles: ; in, Represents the angle of the end cap around the Y axis, Represents the current Y-axis rotation steps, Represents the total number of steps.

[0032] End cover angle adjustment motor 6 around the Z axis: used to adjust the angle of the end cover 4 around the Z axis to cover different measurement angles: ; in, Represents the angle of the end cap around the Z axis, Represents the current Z-axis rotation steps. Represents the total number of steps.

[0033] End cap inner support clamp 7: clamps and fixes the end cap 4 to be measured, ensures the stability of the end cap 4 during the measurement process, provides uniform clamping force, and avoids displacement or deformation of the end cap 4 during the measurement process.

[0034] 2.3-point spectrum measuring instrument 2 Function: Perform actual arc radius measurement and select confocal sensor as the probe to solve the limitations of traditional methods.

[0035] Sensor selection: Confocal sensors are suitable for dealing with high reflectivity and occlusion issues because their light is coaxial with the measurement axis.

[0036] Measurement accuracy: Choose a high-resolution confocal sensor to ensure measurement accuracy and repeatability.

[0037] Calibration and Maintenance: Designed with sensor calibration and maintenance requirements in mind to ensure long-term stable measurement performance.

[0038] Confocal sensor distance measurement: ; in, Represents the measured distance, represents the focal length, stands for diffraction limit.

[0039] Arc radius fitting, using the least squares method to fit the arc: ; in, represents the coordinates of the center of the circle, represents the radius of the circle, m represents the number of data points, i=1, 2, 3...m, Represents the coordinates of the data point.

[0040] This solution uses a spectral confocal sealing comb tooth chamfer arc radius measurement device and method to measure the distance between the target object and the measurement system, and realizes high-precision measurement by analyzing the wavelength or spectrum characteristics of light; it is equipped with a high-precision position sensor and a closed-loop control system to realize accurate position control and adjustment; the confocal sensor light is coaxial with the measurement axis, which is suitable for dealing with high reflectivity and occlusion problems; the clamping jaws provide uniform clamping force to avoid displacement or deformation of the end cover during the measurement process.

[0041] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A spectral confocal sealing comb tooth chamfer arc radius measuring device, characterized in that: It comprises a point spectrum displacement module (1), a point spectrum measuring instrument (2), and an end cover rotating device (3); The point spectrum displacement module (1) measures the position of the probe relative to the object being measured, detects small displacement changes in the vertical direction, and obtains the geometric characteristics of the arc; The point spectrum measuring instrument (2) performs actual arc radius measurement; The end cover rotating device (3) provides the end cover with a rotating motion around the Y axis and the Z axis, and comprehensively measures the arc from different angles; The point spectrum displacement module (1) is connected to the point spectrum measuring instrument (2), and the spectrum displacement module (1) and the point spectrum measuring instrument (2) are both arranged above the end cover rotating device (3).

2. The spectral confocal sealing comb teeth chamfer arc radius measuring device according to claim 1, characterized in that: The point spectrum displacement module (1) is driven by a servo motor, and the point spectrum displacement module (1) comprises a position sensor and a closed-loop control system; The point spectrum displacement module (1) obtains different measurement positions through a position sensor, and controls and adjusts the position through a closed-loop control system.

3. The spectral confocal sealing comb teeth chamfer arc radius measuring device according to claim 1, characterized in that: The end cover rotating device (3) comprises an end cover (4), a motor for adjusting the angle of the end cover around the Y axis (5), a motor for adjusting the angle of the end cover around the Z axis (6), and an end cover inner support clamp (7); The end cover inner support clamping claw (7) clamps and fixes the end cover (4), and the end cover inner support clamping claw (7) is arranged at the center position of the end cover (4); The end cover angle adjustment motor (5) around the Y axis adjusts the angle of the end cover (4) around the Y axis to cover the measurement angle of the Y axis; The end cover angle adjustment motor (6) around the Z axis adjusts the angle of the end cover (4) around the Z axis to cover the measurement angle of the Z axis; The end cover is connected to the lower end of the end cover (4) by the motor (6) for adjusting the angle around the Z axis, and the end cover is connected to the motor (6) for adjusting the angle around the Z axis by the motor (5).

4. The spectral confocal sealing comb teeth chamfer arc radius measuring device according to claim 1, characterized in that: The probe of the point spectrum measuring instrument (2) is a confocal sensor.

5. A spectral confocal sealing grate chamfer radius measuring method, based on a spectral confocal sealing grate chamfer radius measuring device according to any one of claims 1 to 4, characterized in that: It includes the following sub-steps: S1: Point spectrum displacement module (1) performs displacement measurement and spectrum measurement; S2: The end cover rotating device (3) adjusts the angle of the end cover (4) around the Y axis and the Z axis; S3: Point spectrum measuring instrument (2) measures distance and fitted arc radius.

6. The spectral confocal sealing comb teeth chamfer arc radius measurement method according to claim 5, characterized in that: The step S1 comprises the following sub-steps: S11: The point spectrum displacement module (1) performs displacement measurement and calculates the displacement amount. The formula is: ； in, represents the displacement, represents the actual measured distance, represents the reference distance for calibration; S12: The point spectrum shift module (1) performs spectrum measurement and calculates the spectrum intensity. The formula is: ； in, represents the measured spectral intensity, represents the incident spectral intensity, represents the absorption coefficient, Represents the path length.

7. The spectral confocal sealing comb teeth chamfer arc radius measurement method according to claim 5, characterized in that: The step S2 comprises the following sub-steps: S21: The angle of the end cap (4) around the Y axis is obtained by adjusting the motor (5) around the Y axis through the end cap. The formula is: ； in, Represents the angle of the end cap around the Y axis, Represents the current Y-axis rotation steps, Represents the total number of steps; S22: The angle of the end cap (4) around the Z axis is obtained by adjusting the motor (6) around the Z axis through the end cap. The formula is: ； in, Represents the angle of the end cap around the Z axis, Represents the current Z-axis rotation steps. Represents the total number of steps.

8. The spectral confocal sealing comb teeth chamfer arc radius measurement method according to claim 5, characterized in that: The step S3 comprises the following sub-steps: S31: Distance measurement by confocal sensor, the formula is: ； in, Represents the measured distance, represents the focal length, stands for diffraction limit; S32: Use the least squares method to fit the arc. The data points approximately fall on a circle. To fit the arc with the minimum loss, iterate to find the optimal solution. The formula is: ； in, represents the coordinates of the center of the circle, represents the radius of the circle, m represents the number of data points, i=1, 2…m, Represents the coordinates of the data point.

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