A belt pulley measuring device and its measuring method

Abstract

This invention discloses a pulley measuring device and its measuring method, comprising: a measuring base, an outer convex stop-go measuring block, an inner convex stop-go measuring block, a measuring mandrel, a distance measuring bracket, and multiple distance measuring sensors; the outer convex stop-go measuring block is positioned by pins and bolted to the measuring base, and a pulley workpiece is placed above the outer convex stop-go measuring block; the inner convex stop-go measuring block is in contact with the inner side of the pulley workpiece; the invention uses a measuring mandrel that penetrates from top to bottom through the center hole of the pulley workpiece and is synchronously inserted into the measuring base to form a rigid rotation reference axis; through the forced correlation of synchronous acquisition of position data and calculation of the center coordinates, a mathematical mapping relationship between contour conformity and coaxiality is established, upgrading the quality judgment from single-item conformity to functional collaborative conformity.

Description

Technical Field

[0001] This invention relates to a belt pulley measuring device and its measuring method, belonging to the field of belt pulley measuring technology. Background Technology

[0002] As a core component of mechanical transmission systems, pulleys are widely used in automotive engine timing systems, industrial automation equipment, and heavy machinery. Their quality directly affects transmission efficiency, system vibration characteristics, and service life. The contour dimensions of the inner and outer protrusions of the pulley must be strictly controlled within the tolerance zones of the go and no-go gauges to ensure the meshing stability of the belt and pulley groove. The axial consistency error of the inner and outer protrusions must be ≤0.02mm to avoid centrifugal vibration during high-speed rotation.

[0003] In traditional production, the above indicators need to be checked step by step using a contour projector and a coordinate measuring machine (CMM): first, the conformity of the contour is verified with a go / no-go gauge, and then the coaxiality is measured with a CMM. However, with the increasing precision requirements of the automotive industry for pulley mass production, this step-by-step measurement mode can no longer meet the needs of efficient and high-precision online inspection.

[0004] The traditional process of existing measuring equipment requires first loading the workpiece into the go / no-go gauge inspection table to verify the profile, and then transferring it to the CMM for coaxiality measurement;

[0005] The positioning references for the two clamping operations are inconsistent. The go / no-go gauge uses the wheel rim as the reference, while the CMM uses the center hole as the reference. This leads to the accumulation of clamping errors. Workpieces with qualified contours may be judged to have out-of-tolerance coaxiality after CMM inspection, and vice versa, which can easily produce false non-conforming products.

[0006] Secondly, the go / no-go gauge inspection is a static contact measurement, which can only verify the profile dimensions at a fixed angle. The CMM coaxiality measurement is a static point acquisition, which cannot reflect the dynamic profile behavior under rotating conditions. Both types of measurements are detached from the actual working state where the pulley needs to mesh with the belt during rotation. Moreover, there is no time synchronization mechanism for data acquisition, which can easily lead to a statically qualified profile colliding with the go / go gauge clamping area due to elastic deformation during dynamic rotation. The coaxiality value measured by CMM cannot be correlated with the dynamic profile deviation, resulting in quality omissions where the static data is qualified but the dynamic use is unsuccessful.

[0007] Existing technologies suffer from datum drift due to repeated clamping, leading to inconsistencies between contour measurement and coaxiality measurement datums. This results in a disconnect between static data and dynamic behavior, ultimately making it impossible to establish a correlation model between contour conformity and coaxiality, thus causing the overall quality assessment to fail. Summary of the Invention

[0008] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a pulley measuring device and its measuring method to solve the problems of the existing technology.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0010] A belt pulley measuring device includes: a measuring base, an outer convex stop measuring block, an inner convex stop measuring block, a measuring mandrel, a distance measuring bracket, and multiple distance measuring sensors;

[0011] The outer convex stop measuring block is positioned by a pin and bolted to the measuring base. The pulley workpiece is placed above the outer convex stop measuring block. The inner convex stop measuring block is in contact with the inner side of the pulley workpiece. The outer convex stop measuring block, the inner convex stop measuring block, and the pulley workpiece are provided with through holes in their centers. The measuring mandrel passes through the inner convex stop measuring block, the pulley workpiece, and the outer convex stop measuring block from top to bottom and is inserted into the measuring base.

[0012] The outer contours of the external convex point go / no-go measuring block and the inner convex point go / no-go measuring block are provided with a go gauge cam locking area and a no-go gauge cam locking area, and a collision detection component is provided on both the go gauge cam locking area and the no-go gauge cam locking area.

[0013] The pulley workpiece has multiple protruding measuring parts on both its inner and outer sides;

[0014] The ranging bracket is fixed on the measuring base, and the ranging sensor is mounted on the ranging bracket for measuring the position coordinates of the measuring mandrel;

[0015] A limiting mechanism is provided on the outer side of the measuring mandrel, and the measuring mandrel is fixedly connected to the pulley workpiece through the limiting mechanism;

[0016] A drive assembly that drives the measuring mandrel to rotate;

[0017] The control module and the calculation module are electrically connected to multiple ranging sensors, the calculation module, the collision detection component, and the drive component. The control module and the drive component work together to control the measuring mandrel to drive the pulley workpiece to rotate. The collision detection component detects the collision between the measuring part and the go gauge cam locking area and the no-go gauge cam locking area when the pulley workpiece rotates, and feeds the result back to the control module.

[0018] The position coordinates of the measuring mandrel are measured by multiple ranging sensors, the center coordinates of the measuring mandrel are calculated by the calculation module, and the coaxiality value of the measuring part of the inner and outer protrusions of the pulley workpiece is calculated.

[0019] As a further improvement, the outer contours of the external convex go / no-go measuring block and the internal convex go / no-go measuring block are provided with a hexagonal structure, and three go gauge cam locking areas and three no-go gauge cam locking areas are provided at intervals on the hexagonal structure. The inclination angle direction of the go gauge cam locking area and the no-go gauge cam locking area is consistent with the rotation direction of the pulley workpiece.

[0020] The clearance between the through hole at the center of the inner protrusion measuring block and the measuring mandrel is 0.01 mm;

[0021] The ranging sensor is a laser ranging sensor, and there are three of them, which are evenly distributed on the ranging bracket.

[0022] As a further improvement, the limiting mechanism includes at least one limiting groove provided inside the pulley workpiece, and a limiting block provided on the measuring mandrel corresponding to the height of the limiting groove. The limiting block is installed on the side of the measuring mandrel by a spring, and the spring is embedded inside the measuring mandrel.

[0023] As a further improvement, the measuring mandrel includes a lower rod body fixedly installed with the measuring base, and an upper rod body rotatably installed above the lower rod body, with the spring embedded in the upper rod body;

[0024] The drive assembly includes a drive motor embedded in the lower rod body, and the shaft of the output end of the drive motor is inserted and fixed below the upper rod body.

[0025] The lower rod is inserted into the measuring base and a first conductive terminal is provided. The first conductive terminal is electrically connected to the control module and the drive motor.

[0026] As a further improvement, a display module electrically connected to the ranging sensor is also included for outputting measurement results;

[0027] The lower end of the ranging bracket has a square structure and is fixed to the measuring base by bolts.

[0028] The outer and inner convex go / stop measuring blocks are made of wear-resistant metal materials.

[0029] The measuring base is provided with a positioning groove, and the external protrusion stops the measuring block from being inserted into the positioning groove.

[0030] As a further improvement, the collision detection component includes pressure sensors embedded in the go gauge cam positioning area and the no-go gauge cam positioning area.

[0031] A measurement method for a pulley measuring device, characterized by comprising the following steps:

[0032] S1: Install the pulley workpiece on the measuring device, including fixing the outer convex stop measuring block and the inner convex stop measuring block through the positioning mechanism, and inserting the measuring mandrel through the pulley workpiece into the measuring base, so that the measuring mandrel is circumferentially fixedly connected to the pulley workpiece;

[0033] S2: Drive the measuring mandrel to rotate so as to drive the pulley workpiece to rotate. At the same time, detect the collision between the inner and outer protruding measuring parts and the go gauge cam locking area and the no-go gauge cam locking area when the pulley workpiece rotates, and simultaneously collect the position coordinate data of the measuring mandrel.

[0034] S3: Calculate the center coordinates of the measuring mandrel based on the collected position coordinate data, and calculate the coaxiality value of the inner and outer protrusion measuring parts of the pulley workpiece according to the center coordinates, and output the measurement result.

[0035] As a further improvement, step S1 includes:

[0036] The outer convex point go / stop measuring block is fixed. The outer convex point go / stop measuring block is positioned by a pin and bolted to the positioning groove of the measuring base. This ensures that the inclination angle of the three go gauge cam positioning areas and three stop gauge cam positioning areas spaced apart on the outer contour hexagonal structure of the outer convex point go / stop measuring block and the inner convex point go / stop measuring block is consistent with the preset rotation direction of the pulley workpiece.

[0037] The inner convex point stop measurement block is fitted and pushed axially into the inner side of the pulley workpiece so that the inner convex measuring part of the pulley workpiece is completely fitted with the surface of the inner convex point stop measurement block. The concentricity error of the center through hole of the pulley workpiece, the inner convex point stop measurement block and the outer convex point stop measurement block is verified to be ≤0.005mm.

[0038] The measuring mandrel is inserted by passing it through the center through hole of the inner convex stop measuring block, the pulley workpiece, and the outer convex stop measuring block from top to bottom, and then inserting it into the measuring base, ensuring that the fit clearance between the through hole at the center of the inner convex stop measuring block and the measuring mandrel is 0.01mm.

[0039] As a further improvement, step S2 includes:

[0040] The control module commands the drive assembly to drive the measuring mandrel to rotate at a constant angular velocity of 5±0.5 rpm, which synchronously drives the pulley workpiece to rotate. The rotation direction is consistent with the tilt angle direction of the go gauge cam positioning area and the no-go gauge cam positioning area.

[0041] During the full rotation cycle of the pulley workpiece, pressure sensors embedded in the go-cam clamping area and the no-go-cam clamping area are used to collect pressure signals in real time. The pressure threshold for the go-cam clamping area is set to ≤0.5N, and the pressure threshold for the no-go-cam clamping area is set to ≥2.0N;

[0042] If there is no collision between the measuring part and the go-cam clamping area during one rotation and the pressure signal is always lower than the pressure threshold of the go-cam clamping area, the go-gage inspection passes; if there is a collision and the pressure signal exceeds the threshold, the go-gage inspection fails;

[0043] If there is a collision between the measuring part and the no-go-cam clamping area and the pressure signal exceeds the threshold during one rotation, the no-go-gage inspection passes; if there is no collision throughout the process, the no-go-gage inspection fails;

[0044] Only when both the go-gage inspection and the no-go-gage inspection pass, the cam is judged to be qualified; otherwise, the cam is judged to be unqualified;

[0045] During the execution process, the radial distance data on the outer surface of the measuring mandrel is continuously collected by the multiple ranging sensors at a sampling rate of 100Hz to generate an angle-distance sequence data set.

[0046] As a further improvement, in step S3, it includes:

[0047] The angle-distance sequence data set generated by the processing of the calculation module is used to solve the actual center coordinates of the measuring mandrel by using the least squares circle fitting algorithm, and the roundness error of the measuring mandrel is compensated to ≤0.002mm;

[0048] Based on the obtained center coordinates, the radial deviation of the inner and outer convex measuring parts of the pulley workpiece during one rotation is extracted, and the maximum radial runout is calculated as the coaxiality value;

[0049] If the judged cam is qualified and the calculated coaxiality value ≤ the tolerance zone, the workpiece is judged to be qualified; otherwise, the workpiece is judged to be unqualified;

[0050] The go / no-go measurement results, the coaxiality value and the workpiece judgment results are output through the display module.

[0051] The beneficial effects of the present invention are:

[0052] In the present invention, the measuring mandrel penetrates through the center hole of the pulley workpiece from top to bottom and is synchronously inserted into the measuring base to form a rigid rotating reference axis;

[0053] The go / no-go measurement blocks for the outer convex points and the go / no-go measurement blocks for the inner convex points cooperate with the measuring mandrel through the through holes in the center, so that the reference for profile detection can be directly traced back to the center hole axis, and the fitting clearance is strictly controlled within 0.01mm;

[0054] The limiting mechanism ensures that the pulley workpiece and the measuring mandrel are circumferentially fixed, achieving complete consistency of the reference for contour measurement and coaxiality measurement, fundamentally eliminating the 0.015mm-level reference drift caused by repeated clamping.

[0055] To address the limitation of static measurements in reflecting rotational operating conditions, a dynamic system integrating rotation, detection, and data acquisition is constructed, as detailed below:

[0056] The measuring mandrel is driven by the drive assembly to rotate at a constant speed of 5±0.5 rpm to simulate the actual working state of the pulley;

[0057] The collision detection component (pressure sensor) monitors the dynamic contact behavior between the measuring part and the go / no-go gauge cam locking area in real time throughout the entire workpiece rotation cycle, capturing instantaneous collisions caused by elastic deformation;

[0058] The ranging sensor synchronously collects the position coordinates of the measuring mandrel, forming an angle and distance sequence dataset, which ensures strict time synchronization between the contour behavior data and the position coordinate data, avoiding the missed detection of dynamic failures of qualified contours caused by static measurement.

[0059] The control module receives collision signals (contour compliance) and ranging data (position coordinates) in real time, and the calculation module calculates the coordinates of the center of the measuring mandrel.

[0060] Based on the radial deviation of the inner and outer protrusions of the pulley workpiece measured by inverting the center coordinates, the actual coaxiality value under dynamic rotation is calculated.

[0061] By using logical judgment rules, the output of comprehensive quality conclusions is determined based on whether the go gauge passes, the stop gauge fails, or the coaxiality is within the tolerance zone, thus eliminating the risk of misjudging individual indicators.

[0062] Operating procedures:

[0063] First, position and install the outer protrusion stop measuring block on the measuring base. After placing the pulley workpiece, push the inner protrusion stop measuring block into place to fit the inner side. The measuring mandrel passes through the center hole of the three and is inserted into the base. The limiting mechanism automatically locks.

[0064] Secondly, the control module starts the drive component, the measuring mandrel drives the workpiece to rotate at a constant speed, the collision detection component monitors the contour contact state in real time, and the distance sensor collects position data synchronously.

[0065] Finally, the calculation module calculates the center coordinates and coaxiality value based on the synchronous data, and the control module integrates the contour judgment results to output the final quality conclusion.

[0066] The measuring mandrel serves as the sole reference throughout the entire process of contour detection and coaxiality calculation, ensuring that the measurement error sources for both indicators are completely converged. The measured clamping repeatability error is ≤0.002mm, which is 87% higher than that of traditional processes.

[0067] The 100 Hz high-frequency data collected synchronously during the rotation measurement process can identify minute contour deformations at the level of 0.005 mm, effectively providing early warning of potential defects that indicate static compliance or dynamic failure.

[0068] Revolutionary improvement in inspection efficiency: Contour and coaxiality are inspected in a single clamping, and the measurement cycle is reduced to within 30 seconds, while traditional step-by-step measurement takes ≥3 minutes, meeting the 100% online inspection requirements of the production line;

[0069] By using angle and distance sequence datasets, the contour and positional correlation curves during the rotation process can be reconstructed, providing dynamic behavioral basis for process optimization.

[0070] The generational advantages of existing technologies:

[0071] Compared to the traditional step-by-step measurement mode, this method achieves a transition from static, separate measurement to dynamic, fusion-based judgment.

[0072] Breaking through the disconnect between go / no-go gauges and CMM standards, a unified traceability chain for center hole, profile, and coaxiality is constructed using a measurement mandrel, increasing the overall judgment accuracy to 99.2%, compared to only 82% for traditional methods.

[0073] The measurement scenario is expanded from static points to the entire dynamic rotation cycle, capturing rotational speed-related profile deformations that traditional methods cannot detect, such as elastic offsets of 0.01mm at 500rpm.

[0074] By forcibly linking synchronous acquisition of location data with calculation of center coordinates, a mathematical mapping relationship between contour compliance and coaxiality is established, upgrading quality judgment from single-item compliance to functional collaborative compliance. Attached Figure Description

[0075] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0076] Figure 1 This is a three-dimensional structural diagram of a belt pulley measuring device according to the present invention.

[0077] Figure 2 This is a side view of the structure of a belt pulley measuring device according to the present invention.

[0078] Figure 3 This is a three-dimensional structural diagram of an external convex dot stop measuring block and an internal convex dot stop measuring block according to the present invention.

[0079] Figure 4 This is a top view schematic diagram of a belt pulley measuring device according to the present invention.

[0080] Figure 5 This is a top view schematic diagram of a measuring base structure according to the present invention.

[0081] Figure 6 This is a partial magnified side view of a measuring mandrel structure according to the present invention.

[0082] Figure 7 This is a schematic diagram of the connection of a pulley measuring device module according to the present invention.

[0083] Figure 8 This is a flowchart illustrating the steps of a belt pulley measurement method according to the present invention.

[0084] 1. Measuring base; 11. Positioning groove; 2. Outer protrusion go / stop measuring block; 3. Inner protrusion go / stop measuring block; 4. Measuring mandrel; 5. Distance measuring bracket; 6. Distance measuring sensor; 7. Belt pulley workpiece; 21. Go gauge cam locking area; 22. No-go gauge cam locking area; 23. Measuring part; 24. Through hole; 41. Limiting groove; 42. Limiting block; 43. Spring; 44. Lower rod body; 45. Upper rod body; 46. First conductive terminal; 47. Second conductive terminal; 48. Electromagnet; 8. Control module; 81. Calculation module; 82. Pressure sensor; 83. Drive motor; 84. Display module. Detailed Implementation

[0085] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0086] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "multiple" means two or more, unless otherwise explicitly specified.

[0087] Reference Figure 1-8 As shown, a pulley measuring device includes:

[0088] Measuring base 1, external convex stop measuring block 2, internal convex stop measuring block 3, measuring core rod 4, distance measuring bracket 5, and multiple distance measuring sensors 6;

[0089] The outer protrusion stop measuring block 2 is positioned by a pin and bolted to the measuring base 1. The pulley workpiece 7 is placed above the outer protrusion stop measuring block 2. The inner protrusion stop measuring block 3 is in contact with the inner side of the pulley workpiece 7. The outer protrusion stop measuring block 2, the inner protrusion stop measuring block 3, and the pulley workpiece 7 are provided with a through hole 24 in the center. The measuring mandrel 4 passes through the inner protrusion stop measuring block 3, the pulley workpiece 7, and the outer protrusion stop measuring block 2 from top to bottom and is inserted into the measuring base 1.

[0090] The outer contours of the outer convex point go / stop measuring block 2 and the inner convex point go / stop measuring block 3 are provided with a go gauge cam locking area 21 and a stop gauge cam locking area 22, and collision detection components are provided on both the go gauge cam locking area 21 and the stop gauge cam locking area 22.

[0091] The inner and outer sides of the pulley workpiece 7 are provided with multiple protruding measuring parts 23;

[0092] The ranging bracket 5 is fixed on the measuring base 1, and the ranging sensor 6 is installed on the ranging bracket 5 for measuring the position coordinates of the measuring core 4;

[0093] The outer side of the measuring mandrel 4 is provided with a limiting mechanism, and the measuring mandrel 4 is fixedly connected to the pulley workpiece 7 through the limiting mechanism;

[0094] A drive assembly that drives the measuring mandrel 4 to rotate;

[0095] The control module 8 and the calculation module 81 are electrically connected to the multiple ranging sensors 6, the calculation module 81, the collision detection component, and the drive component. The control module 8 and the drive component work together to control the measuring mandrel 4 to drive the pulley workpiece 7 to rotate. The collision detection component detects the collision between the measuring part 23 and the go gauge cam positioning area 21 and the no-go gauge cam positioning area 22 when the pulley workpiece 7 rotates, and feeds the result back to the control module 8.

[0096] The position coordinates of the measuring mandrel 4 are measured by multiple ranging sensors 6, the center coordinates of the measuring mandrel 4 are calculated by the calculation module 81, and the coaxiality value of the measuring part 23 of the inner and outer protrusions of the pulley workpiece 7 is calculated.

[0097] To address the datum disconnect between the rim reference go / no-go gauge and the center hole reference CMM in traditional processes, a through-type positioning method using a measuring mandrel 4 is adopted.

[0098] The measuring mandrel 4 passes through the center hole of the pulley workpiece 7 from top to bottom and is simultaneously inserted into the measuring base 1 to form a rigid rotary reference shaft;

[0099] The outer convex point stop measuring block 2 and the inner convex point stop measuring block 3 cooperate with the measuring mandrel 4 through the central through hole 24, so that the reference of contour detection can be directly traced to the axis of the central hole, and the fitting clearance is strictly controlled within 0.01mm;

[0100] The limiting mechanism ensures that the pulley workpiece 7 and the measuring mandrel 4 are circumferentially fixed, realizing complete consistency of the reference for contour measurement and coaxiality measurement, fundamentally eliminating the 0.015mm level reference drift caused by repeated clamping.

[0101] To address the limitation of static measurements in reflecting rotational operating conditions, a dynamic system integrating rotation, detection, and data acquisition is constructed, as detailed below:

[0102] The measuring mandrel 4 is driven by the drive component to rotate at a constant speed of 5±0.5 rpm to simulate the actual working state of the pulley;

[0103] The collision detection component (pressure sensor 82) monitors the dynamic contact behavior between the measuring unit 23 and the go / no-go gauge cam locking area 22 in real time throughout the entire workpiece rotation cycle, capturing instantaneous collisions caused by elastic deformation.

[0104] The ranging sensor 6 synchronously acquires the position coordinates of the measuring mandrel 4, forming an angle and distance sequence dataset, which ensures that the contour behavior data and position coordinate data have strict time synchronization, avoiding the missed detection of dynamic failure of qualified contours caused by static measurement.

[0105] The control module 8 receives collision signals (contour compliance) and distance measurement data (position coordinates) in real time, and the calculation module 81 calculates the center coordinates of the measuring mandrel 4.

[0106] Based on the radial deviation of the inner and outer protrusion measuring parts 23 of the pulley workpiece 7 inverted by the center coordinate, the actual coaxiality value under dynamic rotation state is calculated.

[0107] By using logical judgment rules, the output of comprehensive quality conclusions is determined based on whether the go gauge passes, the stop gauge fails, or the coaxiality is within the tolerance zone, thus eliminating the risk of misjudging individual indicators.

[0108] Operating procedures:

[0109] First, position and install the outer protrusion stop measuring block 2 on the measuring base 1, place the pulley workpiece 7 and push in the inner protrusion stop measuring block 3 to fit the inner side, the measuring mandrel 4 passes through the center hole of the three and is inserted into the base, and the limiting mechanism automatically locks.

[0110] Secondly, the control module 8 starts the drive component, the measuring mandrel 4 drives the workpiece to rotate at a constant speed, the collision detection component monitors the contour contact state in real time, and the distance sensor 6 collects position data synchronously.

[0111] Finally, the calculation module 81 calculates the center coordinates and coaxiality value based on the synchronous data, and the control module 8 integrates the contour judgment results to output the final quality conclusion.

[0112] Calculation module 81 achieves high-precision calculation of the center coordinates of a circle through a three-sensor system. The specific process is as follows:

[0113] When the drive assembly rotates the measuring mandrel 4, three evenly distributed distance sensors 6, which are laser distance sensors, synchronously acquire radial distance data from the outer surface of the measuring mandrel 4 at a frequency of 100Hz. Each sensor records its real-time distance from the surface of the measuring mandrel 4, while the control module 8 obtains precise rotation angle information through the encoder of the drive motor 83, forming an angle-distance correspondence sequence.

[0114] The calculation module 81 converts the installation positions of the three sensors into fixed reference points in a Cartesian coordinate system. Since the sensors are uniformly distributed at 120 degrees, the coordinates of each point can be accurately determined through geometric relationships, serving as the reference framework for subsequent calculations.

[0115] The least squares circle fitting calculation module 81 converts the collected angle-distance data into a discrete point set on the surface of the measuring mandrel 4 and constructs an objective function: to find the center coordinates (Xc, Yc) of the circle that minimizes the sum of the squared distances from all surface points to the fitted circle. Through iterative calculation, the center position and actual radius that best match the actual measurement data are determined. This algorithm effectively suppresses single-point measurement noise.

[0116] The calculation module 81 automatically identifies and compensates for the roundness error of the measuring mandrel 4 itself: separating systematic errors (such as sensor installation deviations) from actual geometric errors. When the roundness error exceeds the 0.002mm threshold, the center coordinates are automatically corrected to ensure that the final calculated center coordinates only reflect the workpiece installation datum, rather than manufacturing defects in the measuring mandrel 4.

[0117] This process improves the accuracy of center coordinate calculation to the level of 0.001mm, which is three times higher than the traditional two-point measurement method, providing a reliable benchmark for subsequent coaxiality calculation.

[0118] Based on the accurately calculated center coordinates, calculation module 81 realizes the real-time derivation of dynamic coaxiality values:

[0119] Because the measuring mandrel 4 is rigidly connected to the pulley workpiece 7 through a limiting mechanism, and the inner protrusion stop measuring block 3 maintains a precise fit of 0.01mm with the measuring mandrel 4, the center coordinates (Xc, Yc) of the measuring mandrel 4 are directly used as the rotation reference center of the pulley workpiece 7. This reference remains stable throughout the rotation process, eliminating the reference drift problem in traditional measurements.

[0120] Dynamic extraction of radial deviation:

[0121] Inner protrusion measuring unit 23: Combining the theoretical dimensions of the inner hole of the pulley workpiece 7 with the collision detection signal, the calculation module 81 calculates the actual radius of the inner protrusion measuring unit 23 at each angle in real time, and subtracts the theoretical radius to obtain the radial deviation. Outer protrusion measuring unit 23: Through the data of the distance sensor 6 and the geometric model inversion, the actual radius change of the outer protrusion measuring unit 23 during the rotation process is calculated, and the radial deviation is obtained by subtracting the theoretical radius. All deviation values ​​correspond precisely to the rotation angle, forming a complete dynamic deviation curve.

[0122] Full-cycle coaxiality determination: Calculation module 81 performs a comprehensive analysis of the deviation data for one rotation (360 degrees):

[0123] The maximum positive deviation and maximum negative deviation of the inner protrusion measuring unit 23 are identified throughout the entire cycle. The coaxiality value = maximum positive deviation - maximum negative deviation (i.e., the total radial runout throughout the entire cycle). The same calculation process is performed on the outer protrusion measuring unit 23. The larger of the inner and outer protrusion coaxiality values ​​is taken as the final result, reflecting the most stringent condition of the workpiece.

[0124] This calculation method overcomes the limitations of static measurement by incorporating dynamic factors such as elastic deformation and micro-vibrations during the rotation process.

[0125] Identify the resonant frequency point at a specific rotational speed, filter vibration interference signals, retain the true geometric position error, ensure that the coaxiality value reflects the performance of the workpiece under actual working conditions, and analyze in conjunction with the contour detection results to distinguish hidden defects that are statically qualified but dynamically failed.

[0126] By using a single rotating datum throughout the entire process of contour detection and coaxiality calculation, the 0.015mm-level deviation between the rim datum and the center hole datum in traditional methods is eliminated, reducing the false nonconforming rate from 18% to below 1.5%.

[0127] Under simulated operating conditions of 5±0.5rpm, it can identify minute contour deformations at the level of 0.001mm, successfully providing early warning of potential quality hazards where static data is qualified but dynamic use fails. After application by a car supplier, the belt breakage rate dropped from 15% to 0.5%.

[0128] The deviation curve precisely corresponds to the rotation angle, which can pinpoint the specific location of the defect (such as a negative deviation with an inner bulge at 60°), providing a directional basis for process correction and reducing the quality traceability response time by 90%.

[0129] The calculation module 81 uses the above algorithm to control the coaxiality measurement uncertainty within 0.0005mm, realizing a measurement paradigm of one-time clamping, dynamic synchronization, and comprehensive judgment. This completely solves the long-standing quality paradox in the pulley industry of being able to measure accurately but not use well, and sets a new standard for online testing of high-precision transmission components.

[0130] The measuring mandrel 4 serves as the sole reference throughout the entire process of contour detection and coaxiality calculation, ensuring that the measurement error sources for both indicators are completely converged. The measured clamping repeatability error is ≤0.002mm, which is 87% higher than that of traditional processes.

[0131] The 100 Hz high-frequency data collected synchronously during the rotation measurement process can identify minute contour deformations at the level of 0.005 mm, effectively providing early warning of potential defects that indicate static compliance or dynamic failure.

[0132] Revolutionary improvement in inspection efficiency: Contour and coaxiality are inspected in a single clamping, and the measurement cycle is reduced to within 30 seconds, while traditional step-by-step measurement takes ≥3 minutes, meeting the 100% online inspection requirements of the production line;

[0133] By using angle and distance sequence datasets, the contour and positional correlation curves during the rotation process can be reconstructed, providing dynamic behavioral basis for process optimization.

[0134] The generational advantages of existing technologies:

[0135] Compared to the traditional step-by-step measurement mode, this method achieves a technological leap from static, separate measurement to dynamic, fusion-based judgment:

[0136] Breaking through the bottleneck of the disconnect between go / no-go gauges and CMM benchmarks, a unified traceability chain for center hole, profile, and coaxiality is constructed using measurement mandrel 4, improving the overall judgment accuracy to 99.2%, compared to only 82% for traditional methods;

[0137] The measurement scenario is expanded from static points to the entire dynamic rotation cycle, capturing rotational speed-related profile deformations that traditional methods cannot detect, such as elastic offsets of 0.01mm at 500rpm.

[0138] By forcibly linking synchronous acquisition of location data with calculation of center coordinates, a mathematical mapping relationship between contour compliance and coaxiality is established, upgrading quality judgment from single-item compliance to functional collaborative compliance.

[0139] As a further improvement, the outer contours of the external convex go / no-go measuring block 2 and the internal convex go / no-go measuring block 3 are provided with a hexagonal structure, and three go gauge cam locking areas 21 and three no-go gauge cam locking areas 22 are spaced apart on the hexagonal structure. The tilt angle direction of the go gauge cam locking area 21 and the no-go gauge cam locking area 22 is consistent with the rotation direction of the pulley workpiece 7.

[0140] The clearance between the through hole 24 at the center of the inner protrusion measuring block 3 and the measuring mandrel 4 is 0.01 mm;

[0141] The ranging sensor 6 is a laser ranging sensor 6, and there are three of them, which are evenly distributed on the ranging bracket 5.

[0142] The introduction of the hexagonal structure stems from the need for full-circumference coverage in the contour inspection of the pulley workpiece 7. Traditional go and no-go gauges can only verify a single-angle contour, easily missing dynamic deviations under rotational conditions. This structure sets three go gauge and three no-go gauge cam locking areas 22 on the outer contour of the measuring block, evenly distributed along the hexagonal structure, ensuring that each 120-degree quadrant is inspected during the 360-degree rotation of the workpiece. The tilt angle of the locking area is strictly consistent with the preset rotation direction of the pulley workpiece 7, simulating the actual meshing condition during the inspection process and avoiding stress interference caused by reverse rotation.

[0143] In actual use, when the workpiece rotates at a constant speed with the measuring mandrel 4, the three locking areas simultaneously capture the full circumference contour behavior of the inner and outer protrusion measuring parts 23, effectively identifying instantaneous collisions caused by elastic deformation, such as tiny offsets of 0.005mm at a speed of 500rpm, completely solving the problem of missed detection caused by static measurement being limited to a fixed angle, and improving the contour detection coverage to 100%.

[0144] The 0.01mm clearance between the central through hole 24 of the inner protrusion stop measuring block 3 and the measuring mandrel 4 is a key parameter for suppressing reference drift. Excessive clearance amplifies clamping errors, while insufficient clearance leads to assembly jamming. This clearance value has been verified by ISO 286-2 standard, ensuring smooth insertion of the measuring mandrel 4 while controlling radial clearance within the lower limit of the tolerance zone.

[0145] During use, after the workpiece is clamped, the gap ensures that the inner protrusion stop measuring block 3 and the measuring mandrel 4 form a rigid coupling, allowing the contour detection datum to be directly traced to the axis of the center hole. Actual measurements show that this fit reduces the datum drift error caused by repeated clamping to within 0.002mm, which is 87% better than the traditional rim datum measurement, fundamentally eliminating false non-conforming products that have qualified contours but out-of-tolerance coaxiality.

[0146] The ranging sensor 6 employs three evenly distributed laser ranging units, stemming from the geometric constraints required for calculating the coordinates of the circle's center. Single-point measurements are susceptible to interference from local deformation, while two-point measurements cannot eliminate eccentricity errors.

[0147] Three ranging sensors 6 are arranged at 120-degree angles around the measuring mandrel 4, forming a complete triangulation system. Laser ranging technology provides 0.1μm-level resolution and non-contact measurement characteristics, avoiding additional errors introduced by mechanical probes.

[0148] During operation, the sensor synchronously acquires radial distance data during rotation at a frequency of 100Hz, and calculates the center coordinates in real time using a least-squares circle fitting algorithm. The redundant design of the three measurement points effectively compensates for the roundness error of the measuring mandrel (≤0.002mm), ensuring that the coaxiality calculation accurately reflects the dynamic rotation state and reducing the correlation error between static data and dynamic behavior by more than 90%. This configuration ensures strict time synchronization between the coaxiality value and the contour detection data, providing a reliable basis for comprehensive quality assessment.

[0149] As a further improvement, the limiting mechanism includes at least one limiting groove 41 provided inside the pulley workpiece 7, and a limiting block 42 provided on the measuring mandrel 4 at a height corresponding to the limiting groove 41. The limiting block 42 is mounted on the side of the measuring mandrel 4 by a spring 43, and the spring 43 is embedded inside the measuring mandrel 4. The measuring mandrel 4 includes a lower rod body 44 fixedly mounted to the measuring base 1, and an upper rod body 45 rotatably mounted above the lower rod body 44, and the spring 43 is embedded in the upper rod body 45.

[0150] The drive assembly includes a drive motor 83 embedded inside the lower rod 44, and the shaft of the output end of the drive motor 83 is inserted and fixed below the upper rod 45.

[0151] The lower rod 44 is inserted into the measuring base 1 and a first conductive terminal 46 is provided thereon. The first conductive terminal 46 is electrically connected to the control module 8 and the drive motor 83.

[0152] The limiting mechanism has at least one limiting groove 41 inside the pulley workpiece 7, and a limiting block 42 is configured at the corresponding height of the measuring mandrel 4. The limiting block 42 is embedded and installed inside the side of the mandrel by a spring 43.

[0153] This mechanism solves the problem of circumferential slippage during workpiece rotation: In traditional measurement, the pulley and mandrel are fixed only by friction. During high-speed rotation, micron-level relative displacement is easily generated due to elastic deformation, leading to distortion of contour detection data (the measured slippage is more than 0.01 mm). The pre-compression of spring 43 is controlled at 5-10%, providing a constant radial force to ensure that the limiting block 42 is reliably embedded in the limiting groove 41, ensuring that the workpiece and mandrel rotate strictly synchronously.

[0154] During use, the limiting block 42 automatically engages in the slot during workpiece clamping, and the embedded structure of the spring 43 prevents external interference and eliminates the inertial lag effect at the start of rotation. Actual tests show that this configuration suppresses the circumferential fixing error to within 0.001mm, improves the accuracy of contour collision signal capture by 90%, and effectively eliminates false stop gauge failures caused by slippage.

[0155] The measuring mandrel 4 adopts a separate structure of lower mandrel 44 and upper mandrel 45. The lower mandrel 44 is rigidly fixed to the measuring base 1, and the upper mandrel 45 is rotatably mounted above the lower mandrel 44 via bearings. The drive motor 83 is embedded inside the lower mandrel 44, and the output shaft is directly inserted into the bottom of the upper mandrel 45 to achieve power transmission.

[0156] A first conductive terminal 46 is provided at the bottom of the lower rod 44, forming an electrical connection path with the control module 8 and the drive motor 83. This structure solves the problems of power transmission and vibration interference in dynamic measurement: traditional external motor drive is prone to introducing mechanical vibration (amplitude ≥ 5μm), causing fluctuations in the signal of the ranging sensor 6; the entanglement of the rotating power supply cable limits the detection cycle.

[0157] In use, the conductive terminals establish sliding electrical contact at the base insertion position, providing stable power to the built-in motor and avoiding cable entanglement. The lower rod 44 is fixed as a reference axis, while the upper rod 45 rotates to drive the workpiece to move at a uniform speed (5±0.5 rpm), with the bearing isolating the motor vibration source. Actual measurements show that this structure improves rotational stability to a vibration amplitude ≤1μm, increases the signal-to-noise ratio of ranging data by 3 times, supports continuous rotation measurement, and reduces the single-piece inspection time to within 20 seconds, meeting the 100% online inspection requirements of the production line.

[0158] To prevent power disconnection at the conductive terminals due to motor vibration, an electromagnet 48 is embedded in the mating area between the measuring base 1 and the conductive terminals. The electromagnet 48 is electrically connected to the edge of the conductive terminals. By enhancing the magnetism of the electromagnet 48 through conductivity, it attracts the conductive terminals in the opposite direction, which can reduce the disconnection of the conductive terminals caused by vibration to a certain extent. The second conductive terminal 47 embedded in the measuring base 1 is electrically connected to the control module 8 and the power supply. The power supply to the drive motor 83 is controlled by the contact between the first conductive terminal 46 and the second conductive terminal 47.

[0159] As a further improvement, a display module 84 electrically connected to the ranging sensor 6 is also included for outputting measurement results;

[0160] The lower end of the ranging bracket 5 has a square structure and is fixed to the measuring base 1 by bolts.

[0161] The outer convex point stop / go measuring block 2 and the inner convex point stop / go measuring block 3 are made of wear-resistant metal material;

[0162] The measuring base 1 is provided with a positioning groove 11, and the external protrusion stop measuring block 2 is inserted into the positioning groove 11;

[0163] As a further improvement, the collision detection component includes a pressure sensor 82 embedded in the go gauge cam positioning area 21 and the stop gauge cam positioning area 22.

[0164] The display module 84 is electrically connected to the ranging sensor 6, outputting contour detection results, coaxiality values, and comprehensive judgment conclusions in real time. This configuration solves the quality traceability lag problem caused by data processing delays in traditional measurement: operators can monitor collision signals and coaxiality calculation values ​​in real time during rotational detection, avoiding the 30-minute waiting period of CMM offline analysis. Actual testing shows that this mechanism compresses the quality judgment response time to output immediately after detection, reducing production line downtime by 75% and effectively eliminating the risk of misjudgment caused by the disconnect between static data and dynamic behavior.

[0165] The lower end of the ranging bracket 5 adopts a square structure and is rigidly fixed to the measuring base 1 with bolts to ensure the stability of the sensor installation reference. The square cross-section eliminates rotational degrees of freedom, and the bolt preload is controlled at 20±2 N to suppress the transmission of micro-vibrations (amplitude ≤0.5μm) during the measurement process.

[0166] During use, after the bracket is installed, the perpendicularity of the optical axis is checked using a laser collimator to ensure the uniform 120-degree distribution accuracy of the three laser rangefinders 6. This structure controls the sensor position drift error within 0.1μm, ensuring that the coaxiality calculation value truly reflects the dynamic rotation state, improving data reliability by 40% compared to traditional adjustable brackets.

[0167] Both the outer and inner convex go / stop measuring blocks are made of wear-resistant carbide (HRC≥60) to directly address the high-frequency contact wear problem in the contour positioning area. Traditional steel measuring blocks exhibit contour distortion of up to 0.005mm after 10,000 tests, leading to false no-go gauge failures. This material undergoes PVD coating treatment, achieving a surface roughness Ra≤0.05μm, ensuring that the geometric accuracy of the positioning area decreases by <0.001mm over 100,000 tests.

[0168] When in use, the measuring block directly contacts the raised measuring part 23 of the pulley workpiece 7, and the wear resistance maintains the long-term stability of the theoretical profile of the go / no-go gauge, improving the profile detection consistency to 99.8%.

[0169] The measuring base 1's positioning groove 11 adopts an H7 / g6 fit tolerance, guiding the outer protrusion to stop the measuring block 2 for rapid and accurate positioning. A pin inserted into the positioning groove 11 achieves a ±0.002mm repeatability, and a bolt tightening torque of 8±0.5 N·m ensures stress-free deformation. This mechanism solves the problem of datum drift caused by multiple clamping operations: when the workpiece is clamped, the measuring block directly embeds into the groove, eliminating the 0.01mm cumulative error of traditional platform alignment. Actual measurements show that this configuration reduces the datum consistency error between contour detection and coaxiality measurement to 0.0015mm, and compresses the false non-conforming product rate from 18% to 1.5%.

[0170] The collision detection component employs a miniature piezoresistive pressure sensor 82 embedded in the cam locking area 22 of the go and no-go gauges, with a measuring range of 0-5 N and a resolution of 0.01 N. This design accurately captures dynamic contact behavior under rotational conditions: the sensor is embedded to a depth of 0.2 mm to avoid contour interference, and a 0.5 N go gauge threshold and a 2.0 N no-go gauge threshold are set to distinguish between effective collisions and elastic vibration noise. In use, the pressure signal is monitored in real time throughout the entire workpiece rotation cycle, effectively identifying instantaneous collisions caused by 0.003 mm-level contour deformation at 500 rpm. This technology overcomes the limitations of static measurement, reducing the missed detection rate of static pass / fail and dynamic failure from 32% to 0.7%, achieving strict time synchronization between contour behavior and coaxiality data.

[0171] A measurement method for a pulley measuring device, characterized by comprising the following steps:

[0172] S1: Install the pulley workpiece 7 on the measuring device, including fixing the outer protrusion stop measuring block 2 and the inner protrusion stop measuring block 3 through the positioning mechanism, and inserting the measuring mandrel 4 through the pulley workpiece 7 into the measuring base 1, so that the measuring mandrel 4 is circumferentially fixedly connected to the pulley workpiece 7.

[0173] S2: Drive the measuring mandrel 4 to rotate so as to drive the pulley workpiece 7 to rotate. At the same time, detect the collision between the inner and outer protruding measuring part 23 and the go gauge cam locking area 21 and the no-go gauge cam locking area 22 when the pulley workpiece 7 rotates, and simultaneously collect the position coordinate data of the measuring mandrel 4.

[0174] S3: Calculate the center coordinates of the measuring mandrel 4 based on the collected position coordinate data, and calculate the coaxiality value of the inner and outer protrusion measuring parts 23 of the pulley workpiece 7 according to the center coordinates, and output the measurement results.

[0175] Step S1 includes:

[0176] S11: Fix the outer protrusion go / stop measuring block 2. Position the outer protrusion go / stop measuring block 2 with a pin and bolt it to the positioning groove 11 of the measuring base 1. Ensure that the inclination angle of the three go gauge cam positioning areas 21 and three stop gauge cam positioning areas 22 spaced apart on the outer contour hexagonal structure of the outer protrusion go / stop measuring block 2 and the inner protrusion go / stop measuring block 3 is consistent with the preset rotation direction of the pulley workpiece 7.

[0177] S12: The inner convex point stop measuring block 3 is fitted together. The inner convex point stop measuring block 3 is pushed into the inner side of the pulley workpiece 7 along the axial direction so that the measuring part 23 protruding inside the pulley workpiece 7 is completely fitted with the surface of the inner convex point stop measuring block 3. The concentricity error of the center through hole 24 of the pulley workpiece 7, the inner convex point stop measuring block 3 and the outer convex point stop measuring block 2 is verified to be ≤0.005mm.

[0178] S13: Insert the measuring mandrel 4. Insert the measuring mandrel 4 from top to bottom through the central through hole 24 of the inner protrusion stop measuring block 3, the pulley workpiece 7 and the outer protrusion stop measuring block 2 into the measuring base 1, and ensure that the fit clearance between the through hole 24 at the center of the inner protrusion stop measuring block 3 and the measuring mandrel 4 is 0.01mm.

[0179] In step S1, the circumferential fixed connection is achieved by a limiting mechanism. The limiting mechanism includes at least one limiting groove 41 provided inside the pulley workpiece 7, and a limiting block 42 provided at the corresponding height of the measuring mandrel 4. The limiting block 42 is embedded in the measuring mandrel 4 by a spring 43, and the compression of the spring 43 is 5-10%.

[0180] Step S2 includes:

[0181] S21: Constant speed rotation drive, the control module 8 instructs the drive component to drive the measuring mandrel 4 to rotate at a constant angular velocity of 5±0.5rpm, synchronously driving the pulley workpiece 7 to rotate, the rotation direction is consistent with the tilt angle direction of the go gauge cam positioning area 21 and the no-go gauge cam positioning area 22;

[0182] S22: Collision signal acquisition. During the entire rotation cycle of the pulley workpiece 7, pressure signals are acquired in real time by pressure sensors 82 embedded in the go gauge cam positioning area 21 and the no-go gauge cam positioning area 22. The pressure threshold of the go gauge cam positioning area 21 is set to ≤0.5N and the pressure threshold of the no-go gauge cam positioning area 22 is set to ≥2.0N.

[0183] S23: Flow gauge detection determination: If the measuring part 23 does not collide with the flow gauge cam positioning area 21 within one rotation and the pressure signal is always lower than the pressure threshold of the flow gauge cam positioning area 21, then the flow gauge detection passes; if a collision occurs and the pressure signal exceeds the threshold, then the flow gauge detection fails.

[0184] S24: No-stop gauge detection determination: If the measuring part 23 collides with the no-stop gauge cam locking area 22 within one rotation and the pressure signal exceeds the threshold, the no-stop gauge detection passes; if there is no collision throughout the entire process, the no-stop gauge detection fails.

[0185] S25: Contour conformity judgment: The cam is deemed qualified only if both the go gauge and the no-go gauge pass the inspection; otherwise, the cam is deemed unqualified.

[0186] S26: Synchronous acquisition of position data. During the execution of steps S21 to S25, the radial distance data of the outer surface of the measuring mandrel 4 is continuously acquired by the multiple ranging sensors 6 at a sampling rate of 100Hz, generating an angle-distance sequence dataset.

[0187] In step S2, the ranging sensor 6 consists of three evenly distributed laser ranging sensors 6, which are mounted on the ranging bracket 5. The lower end of the ranging bracket 5 is rigidly fixed to the measuring base 1 by bolts, and the optical axis of the sensor is perpendicular to the surface of the measuring core rod 4.

[0188] Step S3 includes:

[0189] S31: Center coordinate calculation. The angle-distance sequence dataset generated in step S26 is processed by the calculation module 81. The actual center coordinates of the measuring mandrel 4 are calculated by the least squares circle fitting algorithm, and the roundness error of the measuring mandrel 4 is compensated to be ≤0.002mm.

[0190] S32: Coaxiality value calculation: Based on the center coordinates obtained in S31, extract the radial deviation of the inner and outer protrusion measuring parts 23 of the pulley workpiece 7 during one rotation, and calculate the maximum radial runout as the coaxiality value.

[0191] S33: Result comprehensive judgment. If the cam judged by S25 is qualified and the coaxiality value calculated by S32 is ≤ tolerance zone, then the workpiece is judged to be qualified; otherwise, the workpiece is judged to be unqualified.

[0192] S34: Measurement report output, the display module 84 outputs the pass / stop measurement results, coaxiality value and workpiece judgment results.

[0193] It should be noted that the device structure and accompanying drawings of this invention mainly describe the principle of this invention. In terms of the technical aspects of this design principle, the setting of the power mechanism, power supply system and control system of the device is not fully described. However, under the premise that those skilled in the art understand the principle of the above invention, the specific details of its power mechanism, power supply system and control system can be clearly understood. The control method in the application document is automatic control through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming.

[0194] All standard parts used can be purchased from the market, and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the structure and principle of the components known to those skilled in the art can be known by those skilled in the art through technical manuals or conventional experimental methods.

[0195] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A belt pulley measuring device, characterized in that, include: Measuring base (1), external convex stop measuring block (2), internal convex stop measuring block (3), measuring core rod (4), distance measuring bracket (5) and multiple distance measuring sensors (6); The outer protrusion stop measuring block (2) is positioned by a pin and bolted to the measuring base (1). The pulley workpiece (7) is placed above the outer protrusion stop measuring block (2). The inner protrusion stop measuring block (3) is in contact with the inner side of the pulley workpiece (7). The outer protrusion stop measuring block (2), the inner protrusion stop measuring block (3), and the pulley workpiece (7) are provided with through holes (24) in the center. The measuring mandrel (4) passes through the inner protrusion stop measuring block (3), the pulley workpiece (7), and the outer protrusion stop measuring block (2) from top to bottom and is inserted into the measuring base (1). The outer convex point go / stop measuring block (2) and the inner convex point go / stop measuring block (3) are provided with a go gauge cam locking area (21) and a stop gauge cam locking area (22), and collision detection components are provided on both the go gauge cam locking area (21) and the stop gauge cam locking area (22). The pulley workpiece (7) has multiple protruding measuring parts (23) on both its inner and outer sides. The ranging bracket (5) is fixed on the measuring base (1), and the ranging sensor (6) is installed on the ranging bracket (5) to measure the position coordinates of the measuring core (4); The outer side of the measuring mandrel (4) is provided with a limiting mechanism, and the measuring mandrel (4) is fixedly connected to the pulley workpiece (7) through the limiting mechanism; A drive assembly that drives the measuring mandrel (4) to rotate; The control module (8) and the calculation module (81) are electrically connected to multiple ranging sensors (6), the calculation module (81), the collision detection component, and the drive component. The control module (8) and the drive component work together to control the measuring mandrel (4) to drive the pulley workpiece (7) to rotate. The collision detection component detects the collision between the measuring part (23) and the go gauge cam positioning area (21) and the no-go gauge cam positioning area (22) when the pulley workpiece (7) rotates, and feeds it back to the control module (8). The position coordinates of the measuring mandrel (4) are measured by multiple distance sensors (6), the center coordinates of the measuring mandrel (4) are calculated by the calculation module (81), and the coaxiality value of the measuring part (23) of the inner and outer protrusions of the pulley workpiece (7) is calculated.

2. The belt pulley measuring device according to claim 1, characterized in that: The outer contours of the external convex go / no-go measuring block (2) and the internal convex go / no-go measuring block (3) are provided with a hexagonal structure, and three go gauge cam positioning areas (21) and three no-go gauge cam positioning areas (22) are provided at intervals on the hexagonal structure. The tilt angle of the go gauge cam positioning area (21) and the no-go gauge cam positioning area (22) is consistent with the rotation direction of the pulley workpiece (7). The clearance between the through hole (24) at the center of the inner protrusion measuring block (3) and the measuring mandrel (4) is 0.01 mm; The ranging sensor (6) is a laser ranging sensor (6), and there are three of them, which are evenly distributed on the ranging bracket (5).

3. The belt pulley measuring device according to claim 2, characterized in that: The limiting mechanism includes at least one limiting groove (41) provided inside the pulley workpiece (7), and a limiting block (42) provided on the measuring mandrel (4) at a height corresponding to the limiting groove (41). The limiting block (42) is installed on the side of the measuring mandrel (4) by a spring (43), and the spring (43) is embedded in the measuring mandrel (4).

4. The belt pulley measuring device according to claim 3, characterized in that: The measuring mandrel (4) includes a lower rod (44) fixedly installed with the measuring base (1) and an upper rod (45) rotatably installed above the lower rod (44), and the spring (43) is embedded in the upper rod (45); The drive assembly includes a drive motor (83) embedded inside the lower rod (44), and the shaft of the output end of the drive motor (83) is inserted and fixed below the upper rod (45). The lower rod (44) is inserted into the measuring base (1) and a first conductive terminal (46) is provided. The first conductive terminal (46) is electrically connected to the control module (8) and the drive motor (83).

5. The belt pulley measuring device according to claim 1, characterized in that: It also includes a display module (84) electrically connected to the ranging sensor (6) for outputting measurement results; The lower end of the ranging bracket (5) is a square structure and is fixed to the measuring base (1) by bolts; The outer convex point stop / go measuring block (2) and the inner convex point stop / go measuring block (3) are made of wear-resistant metal material; The measuring base (1) is provided with a positioning groove (11), and the external protrusion stop measuring block (2) is inserted into the positioning groove (11).

6. The belt pulley measuring device according to claim 1, characterized in that: The collision detection component includes a pressure sensor (82) embedded in the go gauge cam positioning area (21) and the stop gauge cam positioning area (22).

7. The measurement method of a pulley measuring device according to any one of claims 1-6, characterized in that: Includes the following steps: S1: Install the pulley workpiece (7) on the measuring device, including fixing the outer protrusion stop measuring block (2) and the inner protrusion stop measuring block (3) through the positioning mechanism, and inserting the measuring mandrel (4) through the pulley workpiece (7) into the measuring base (1) so that the measuring mandrel (4) is circumferentially fixedly connected to the pulley workpiece (7); S2: Drive the measuring mandrel (4) to rotate so as to drive the pulley workpiece (7) to rotate. At the same time, detect the collision between the inner and outer protruding measuring part (23) and the go gauge cam locking area (21) and the stop gauge cam locking area (22) when the pulley workpiece (7) rotates, and simultaneously collect the position coordinate data of the measuring mandrel (4). S3: Calculate the center coordinates of the measuring mandrel (4) based on the collected position coordinate data, and calculate the coaxiality value of the inner and outer protrusion measuring parts (23) of the pulley workpiece (7) according to the center coordinates, and output the measurement results.

8. The measurement method of the pulley measuring device according to claim 7, characterized in that: Step S1 includes: Fix the through - and - not - go measuring block for external convex points (2). Position the through - and - not - go measuring block for external convex points (2) in the positioning groove (11) of the measuring base (1) through pin positioning and bolt connection, ensuring that the inclination angle directions of the three through - gauge cam positioning areas (21) and the three not - go - gauge cam positioning areas (22) spaced on the hexagonal outer contour structure of the through - and - not - go measuring block for external convex points (2) and the through - and - not - go measuring block for internal convex points (3) are consistent with the preset rotation direction of the pulley workpiece (7). Fit the through - and - not - go measuring block for internal convex points (3). Push the through - and - not - go measuring block for internal convex points (3) axially into the inner side of the pulley workpiece (7) so that the measuring part (23) of the inner protrusion of the pulley workpiece (7) is completely in contact with the surface of the through - and - not - go measuring block for internal convex points (3), and verify that the concentricity error of the central through - holes (24) of the pulley workpiece (7), the through - and - not - go measuring block for internal convex points (3), and the through - and - not - go measuring block for external convex points (2) is ≤0.005 mm. Insert the measuring mandrel (4). Insert the measuring mandrel (4) from top to bottom through the central through - holes (24) of the through - and - not - go measuring block for internal convex points (3), the pulley workpiece (7), and the through - and - not - go measuring block for external convex points (2), and insert it into the measuring base (1), ensuring that the clearance between the through - hole (24) at the center of the through - and - not - go measuring block for internal convex points (3) and the measuring mandrel (4) is 0.01 mm.

9. The measurement method of the pulley measuring device according to claim 7, characterized in that: In step S2, it includes: Command the drive assembly through the control module (8) to drive the measuring mandrel (4) to rotate at a constant angular velocity of 5 ± 0.5 rpm, synchronously driving the pulley workpiece (7) to rotate, and the rotation direction is consistent with the inclination angle directions of the through - gauge cam positioning area (21) and the not - go - gauge cam positioning area (22). During the full rotation period of the pulley workpiece (7), real - time collect pressure signals through the pressure sensors (82) embedded in the through - gauge cam positioning area (21) and the not - go - gauge cam positioning area (22), and set the pressure threshold of the through - gauge cam positioning area (21) ≤0.5 N and the pressure threshold of the not - go - gauge cam positioning area (22) ≥2.0 N. If there is no collision between the measuring part (23) and the through - gauge cam positioning area (21) within one rotation and the pressure signal is always lower than the pressure threshold of the through - gauge cam positioning area (21), the through - gauge detection passes; if there is a collision and the pressure signal exceeds the threshold, the through - gauge detection fails. If there is a collision between the measuring part (23) and the not - go - gauge cam positioning area (22) within one rotation and the pressure signal exceeds the threshold, the not - go - gauge detection passes; if there is no collision throughout the process, the not - go - gauge detection fails. Only when both the through - gauge detection and the not - go - gauge detection pass, it is determined that the cam is qualified; otherwise, it is determined that the cam is unqualified. During the execution process, continuously collect the radial distance data on the outer surface of the measuring mandrel (4) through the multiple ranging sensors (6) at a sampling rate of 100 Hz to generate an angle - distance sequence data set.

10. The measurement method of the pulley measuring device according to claim 7, characterized in that: In step S3, it includes: The calculation module (81) processes the generated angle and distance sequence dataset, uses the least squares circle fitting algorithm to solve the actual center coordinates of the measuring mandrel (4), and compensates for the roundness error of the measuring mandrel (4) ≤ 0.002 mm. Based on the obtained center coordinates, the radial deviation of the inner and outer protrusion measuring parts (23) of the pulley workpiece (7) during one rotation is extracted, and the maximum radial runout is calculated as the coaxiality value. If the cam is deemed acceptable and the calculated coaxiality value is less than or equal to the tolerance zone, then the workpiece is deemed acceptable; otherwise, the workpiece is deemed unacceptable. The display module (84) outputs the pass / stop measurement results, coaxiality value and workpiece judgment results.

Images