Belt pulley measuring equipment and measuring method thereof

Abstract

The invention discloses belt pulley measuring equipment and a measuring method thereof. The belt pulley measuring equipment comprises a measuring base, an outer salient point pass-stop measuring block, an inner salient point pass-stop measuring block, a measuring core rod, a distance measuring bracket and a plurality of distance measuring sensors, the measuring core rod penetrates through a central hole of the belt pulley workpiece from top to bottom, the outer convex point pass-stop measuring block is positioned through a pin and is connected to the measuring base through a bolt, the belt pulley workpiece is placed above the outer convex point pass-stop measuring block, and the inner convex point pass-stop measuring block is attached to the inner side of the belt pulley workpiece. Synchronously inserting into the measuring base to form a rigid rotary reference shaft; through forced association of synchronous acquisition of position data and calculation of circle center coordinates, a mathematical mapping relation between contour qualification and coaxiality is established, so that quality judgment is upgraded from single qualification to function collaborative qualification.

Description

Technical Field

[0001] The invention relates to a pulley measuring device and a measuring method thereof, belonging to the technical field of pulley measurement. Background Art

[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 impacts transmission efficiency, system vibration characteristics, and service life. The profile dimensions of the inner and outer raised gauges of the pulleys must be strictly controlled within the tolerance band of the go and no-go gauges to ensure stable engagement between the belt and the pulley groove. The axial alignment error of the inner and outer raised gauges must be ≤0.02mm to avoid centrifugal vibration during high-speed rotation.

[0003] In traditional production, these indicators are inspected in stages using a profile projector and a coordinate measuring machine: first, a go / no-go gauge verifies the profile, then a CMM measures the coaxiality. However, with the automotive industry's increasing precision requirements for pulley mass production, this step-by-step measurement model can no longer meet the needs for efficient and high-precision in-line inspection.

[0004] The traditional process of existing measuring equipment requires that the workpiece be loaded into the go / no-go gauge test table to verify the contour, and then transferred to the CMM for coaxiality measurement; However, the positioning references of the two clampings are inconsistent. The go / no-go gauge uses the wheel rim as the reference, and the CMM uses the center hole as the reference, which leads to the accumulation of clamping errors. A workpiece with qualified contour may be judged to have excessive coaxiality after CMM inspection, and vice versa, which can easily produce false defective products.

[0005] Secondly, the go / no-go gauge detection is a static contact measurement, which can only verify the contour size of a fixed angle. The CMM coaxiality measurement is a static point acquisition, which cannot reflect the dynamic contour behavior under rotating conditions. Both types of measurements are separated from the actual working state of the pulley that needs to engage with the belt during rotation, and there is no time synchronization mechanism for data acquisition. It is easy for a statically qualified contour to collide with the go / no-go gauge positioning area due to elastic deformation during dynamic rotation. The coaxiality value measured by the CMM cannot be associated with the dynamic contour deviation, resulting in quality omissions where the static data is qualified but the dynamic use fails.

[0006] The existing technology causes datum drift due to multiple clamping, resulting in inconsistent contour measurement and coaxiality measurement datums, which in turn causes a separation between static data and dynamic behavior, and ultimately makes it impossible to establish a correlation model between contour conformity and coaxiality, resulting in the failure of comprehensive quality judgment. Summary of the Invention

[0007] In view of the deficiencies in the prior art, the present invention aims to provide a pulley measuring device and a measuring method thereof to solve the problems of the prior art.

[0008] In order to achieve the above object, the present invention is implemented through the following technical solutions: A pulley measuring device comprises: a measuring base, an outer convex point pass / stop measuring block, an inner convex point pass / stop measuring block, a measuring core rod, a distance measuring bracket and a plurality of distance measuring sensors; The outer convex point pass / stop measuring block is positioned by a pin and bolted to the measuring base, the pulley workpiece is placed above the outer convex point pass / stop measuring block, the inner convex point pass / stop measuring block is fitted with the inner side of the pulley workpiece, and through holes are provided in the centers of the outer convex point pass / stop measuring block, the inner convex point pass / stop measuring block, and the pulley workpiece, and the measuring mandrel passes through the inner convex point pass / stop measuring block, the pulley workpiece, and the outer convex point pass / stop measuring block from top to bottom and is inserted into the measuring base; A go gauge cam clamping area and a stop gauge cam clamping area are provided on the outer contours of the outer convex point pass / stop measuring block and the inner convex point pass / stop measuring block, and a collision detection component is provided on both the go gauge cam clamping area and the stop gauge cam clamping area; The pulley workpiece is provided with a plurality of raised measuring parts on both the inner and outer sides; The distance measuring bracket is fixed on the measuring base, and the distance measuring sensor is installed on the distance measuring bracket to measure the position coordinates of the measuring mandrel; 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; a driving assembly for driving the measuring mandrel to rotate; A control module and a calculation module, wherein the control module is electrically connected to the plurality of distance measuring sensors, the calculation module, the collision detection assembly, and the drive assembly. The control module cooperates with the drive assembly to control the measuring mandrel to drive the pulley workpiece to rotate. The collision detection assembly detects the collision of the measuring portion with the go gauge cam engagement area and the stop gauge cam engagement area when the pulley workpiece rotates, and feeds back to the control module. The position coordinates of the measuring mandrel are measured by a plurality of the distance measuring sensors, the center coordinates of the measuring mandrel are calculated by the calculation module, and the coaxiality values ​​of the measuring parts of the inner and outer protrusions of the pulley workpiece are calculated.

[0009] As a further improvement, the outer contours of the outer convex point pass / stop measuring block and the inner convex point pass / stop measuring block are provided with a hexagonal structure, and three pass gauge cam clamping areas and three stop gauge cam clamping areas are provided at intervals on the hexagonal structure, and the inclination angle direction of the pass gauge cam clamping area and the stop gauge cam clamping area is consistent with the rotation direction of the pulley workpiece; The clearance between the through hole at the center of the inner convex point pass / stop measuring block and the measuring core rod is 0.01 mm; The distance measuring sensors are laser distance measuring sensors, and there are three of them, which are evenly distributed on the distance measuring bracket.

[0010] As a further improvement, the limiting mechanism includes at least one limiting groove provided on the inner side of the pulley workpiece, and a limiting block is 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 through a spring, and the spring is embedded in the inside of the measuring mandrel.

[0011] As a further improvement, the measuring core rod comprises a lower rod body fixedly mounted on the measuring base, and an upper rod body rotatably mounted above the lower rod body, and the spring is embedded in the upper rod body; The driving assembly includes a driving motor embedded in the lower rod body, and a rotating shaft at the output end of the driving motor is inserted and fixed under the upper rod body; A first conductive terminal is provided at the location where the lower rod is inserted into the measuring base, and the first conductive terminal is electrically connected to the control module and the drive motor.

[0012] As a further improvement, the present invention further comprises a display module electrically connected to the distance measuring sensor, for outputting the measurement result; The lower end of the distance measuring bracket is a square structure and is fixed to the measuring base by bolts; The outer convex point go / stop measuring block and the inner convex point go / stop measuring block are made of wear-resistant metal material; The measuring base is provided with a positioning groove, and the outer convex point pass-stop measuring block is inserted into the positioning groove.

[0013] As a further improvement, the collision detection assembly includes a pressure sensor embedded in the go gauge cam positioning area and the stop gauge cam positioning area.

[0014] A measuring method for a pulley measuring device, characterized in that it comprises the following steps: S1: Mounting the pulley workpiece on the measuring device, including fixing the outer convex point pass / stop measuring block and the inner convex point pass / stop measuring block by a positioning mechanism, and inserting the measuring mandrel through the pulley workpiece and inserting it into the measuring base, so that the measuring mandrel is fixedly connected to the pulley workpiece in the circumferential direction; S2: driving the measuring mandrel to rotate to drive the pulley workpiece to rotate, and simultaneously detecting the collision of the inner and outer raised measuring parts with the go gauge cam positioning area and the stop gauge cam positioning area when the pulley workpiece rotates, and synchronously collecting the position coordinate data of the measuring mandrel; S3: Calculate the center coordinates of the measuring mandrel based on the collected position coordinate data, calculate the coaxiality values ​​of the inner and outer protrusion measuring parts of the pulley workpiece according to the center coordinates, and output the measurement results.

[0015] As a further improvement, step S1 includes: The outer convex point pass / stop measuring block is fixed, and the outer convex point pass / stop measuring block is positioned by a pin and bolted into the positioning groove of the measuring base, ensuring that the inclination angle direction of the three pass gauge cam positioning areas and the three stop gauge cam positioning areas arranged at intervals on the outer contour hexagonal structure of the outer convex point pass / stop measuring block and the inner convex point pass / stop measuring block is consistent with the preset rotation direction of the pulley workpiece; The inner convex point pass / stop measuring block is fitted, and the inner convex point pass / stop measuring block is pushed axially into the inner side of the pulley workpiece so that the raised measuring portion of the pulley workpiece is completely fitted with the surface of the inner convex point pass / stop measuring block, and the concentricity error of the central through hole of the pulley workpiece, the inner convex point pass / stop measuring block and the outer convex point pass / stop measuring block is verified to be ≤0.005mm; The measuring mandrel is inserted by passing the measuring mandrel from top to bottom through the central through hole of the inner convex point pass-stop measuring block, the pulley workpiece and the outer convex point pass-stop measuring block, and inserted into the measuring base, ensuring that the fitting clearance between the through hole at the center of the inner convex point pass-stop measuring block and the measuring mandrel is 0.01 mm.

[0016] As a further improvement, step S2 includes: The control module instructs the drive assembly to rotate the measuring mandrel at a constant angular velocity of 5±0.5 rpm, thereby synchronously driving the pulley workpiece to rotate, with the rotation direction being consistent with the inclination angle direction of the go gauge cam engagement area and the stop gauge cam engagement area; During the full rotation cycle of the pulley workpiece, the pressure signals are collected in real time by means of pressure sensors embedded in the go gauge cam engagement area and the stop gauge cam engagement area, and the pressure threshold of the go gauge cam engagement area is set to be ≤0.5N and the pressure threshold of the stop gauge cam engagement area is set to be ≥2.0N; If the measuring part does not collide with the positioning area of ​​the cam of the go gauge within one rotation and the pressure signal is always lower than the pressure threshold of the positioning area of ​​the cam of the go gauge, the go gauge test passes; if a collision occurs and the pressure signal exceeds the threshold, the go gauge test fails; If the measuring part collides with the stop gauge cam engagement area within one rotation and the pressure signal exceeds the threshold, the stop gauge detection passes; if there is no collision throughout the entire process, the stop gauge detection fails; The cam is considered qualified only when both the through gauge test and the stop gauge test are passed; otherwise, the cam is considered unqualified. During the execution process, the radial distance data of the outer surface of the measuring core rod is continuously collected by the multiple distance measuring sensors at a sampling rate of 100 Hz to generate an angle-distance sequence data set.

[0017] As a further improvement, step S3 includes: The angle-distance sequence data set generated by the calculation module is processed, and the actual center coordinates of the measuring mandrel are solved using a least squares circle fitting algorithm, and the roundness error of the measuring mandrel is compensated to be ≤0.002 mm; Based on the obtained coordinates of the circle center, the radial deviation of the inner and outer raised measuring parts of the pulley workpiece during one rotation is extracted, and the maximum radial runout is calculated as the coaxiality value; If the cam is judged to be qualified and the calculated coaxiality value is ≤ the tolerance zone, the workpiece is judged to be qualified; otherwise, the workpiece is judged to be unqualified; The through-and-off measurement result, the coaxiality value and the workpiece determination result are outputted through the display module.

[0018] The beneficial effects of the present invention are: The present invention passes the measuring core rod through the center hole of the pulley workpiece from top to bottom and is synchronously inserted into the measuring base to form a rigid rotary reference axis; The outer convex point go / no-go measuring block and the inner convex point go / no-go measuring block are matched with the measuring mandrel through the through hole in the center, so that the benchmark of the contour detection can be directly traced back to the axis of the center hole, and the matching clearance is strictly controlled at 0.01mm; The limit mechanism ensures that the pulley workpiece and the measuring mandrel are circumferentially fixed, achieving complete unification of the benchmarks for contour measurement and coaxiality measurement, and fundamentally eliminating the 0.015mm level benchmark drift caused by repeated clamping.

[0019] To address the defect that static measurement cannot reflect the rotating working condition, a dynamic setting of rotation, detection and acquisition is constructed as follows: 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; The collision detection component (pressure sensor) monitors the dynamic contact behavior between the measuring part and the go / no-go gauge cam positioning area in real time throughout the workpiece rotation cycle, capturing instantaneous collisions caused by elastic deformation. The distance measuring sensor synchronously collects the position coordinates of the measuring core rod to form an angle and distance sequence data set, so that the contour behavior data and the position coordinate data have strict time synchronization, avoiding the missed detection of dynamic failure of qualified contours caused by static measurement.

[0020] The control module receives the collision signal (contour conformity) and distance measurement data (position coordinates) in real time, and the calculation module calculates the coordinates of the center of the measuring mandrel; Based on the inversion of the center coordinates of the pulley workpiece, the radial deviation of the inner and outer raised measuring parts is calculated to calculate the actual coaxiality value under the dynamic rotation state; Through logical judgment rules, comprehensive quality conclusions are output if the go gauge passes, the stop gauge fails, and the coaxiality is ≤ the tolerance zone, eliminating the risk of misjudgment of a single indicator.

[0021] Operation process: First, position and install the outer convex point go / stop measuring block on the measuring base. After placing the pulley workpiece, push the inner convex point go / stop measuring block into place and fit it against the inside. The measuring mandrel passes through the center holes of the three and is inserted into the base. The limit mechanism automatically locks. Secondly, the control module activates the drive assembly, the measuring mandrel drives the workpiece to rotate at a constant speed, the collision detection assembly monitors the contour contact status in real time, and the ranging sensor synchronously collects position data; 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.

[0022] The measuring mandrel serves as the sole reference throughout the entire process of contour detection and coaxiality calculation, completely converging the measurement error sources of the two indicators. The measured clamping repeatability error is ≤0.002mm, an 87% improvement over traditional processes. The 100 Hz high-frequency data collected synchronously during the rotation measurement process can identify tiny contour deformations of 0.005 mm, effectively warning of potential defects such as static acceptance and dynamic failure. Revolutionary improvement in inspection efficiency: Contour and coaxiality inspections can be completed in a single clamping operation, with a measurement cycle compressed to less than 30 seconds. Traditional step-by-step measurement takes ≥ 3 minutes, meeting the production line's 100% online inspection requirements. The profile and position correlation curve during the rotation process can be reconstructed through the angle and distance sequence data sets, providing a dynamic behavior basis for process optimization.

[0023] Generational advantages over existing technologies: Compared with the traditional step-by-step measurement mode, it realizes the transition from static separation measurement to dynamic fusion judgment: Breaking through the reliance on separate go / no-go gauges and CMM benchmarks, a unified traceability chain for center hole, contour, and coaxiality is established using a measuring mandrel, increasing the overall accuracy of determination to 99.2%, compared to only 82% with traditional methods. Expanding the measurement scenario from static points to the full dynamic rotation cycle, capturing speed-related profile deformations that traditional methods cannot detect, such as 0.01mm elastic offset at 500rpm; By forcibly associating the synchronous acquisition of position data with the calculation of circle center coordinates, a mathematical mapping relationship between contour conformity and coaxiality is established, enabling quality judgment to be upgraded from single-item conformity to functional collaborative conformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of a pulley measuring device of the present invention.

[0026] Figure 2 It is a side structural schematic diagram of a pulley measuring device of the present invention.

[0027] Figure 3 It is a three-dimensional structural schematic diagram of an outer convex point pass / stop measurement block and an inner convex point pass / stop measurement block of the present invention.

[0028] Figure 4 It is a schematic diagram of the top view of the structure of a pulley measuring device of the present invention.

[0029] Figure 5 It is a schematic diagram of the top view structure of a measuring base of the present invention.

[0030] Figure 6 It is a schematic diagram of a partially enlarged side view of the structure of a measuring mandrel of the present invention.

[0031] Figure 7 This is a schematic diagram of the connection of a pulley measuring device module of the present invention.

[0032] Figure 8 This is a step diagram of a pulley measuring method of the present invention.

[0033] 1. Measuring base; 11. Positioning groove; 2. External convex point pass / stop measuring block; 3. Internal convex point pass / stop measuring block; 4. Measuring core rod; 5. Distance measuring bracket; 6. Distance measuring sensor; 7. Pulley workpiece; 21. Go gauge cam positioning area; 22. Stop gauge cam positioning area; 23. Measuring part; 24. Through hole; 41. Limiting groove; 42. Limiting block; 43. Spring; 44. Lower rod; 45. Upper rod; 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 DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work 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 drawings is not intended to limit the scope of the invention for which protection is sought, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, the terms first and second are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features defined as first or second may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise specifically defined.

[0036] Reference Figure 1-8 As shown, a pulley measuring device includes: Measuring base 1, outer convex point pass / stop measuring block 2, inner convex point pass / stop measuring block 3, measuring core rod 4, distance measuring bracket 5 and multiple distance measuring sensors 6; The outer convex point pass / stop measuring block 2 is positioned by a pin and bolted to the measuring base 1, and the pulley workpiece 7 is placed above the outer convex point pass / stop measuring block 2. The inner convex point pass / stop measuring block 3 is fitted with the inner side of the pulley workpiece 7. A through hole 24 is provided in the center of the outer convex point pass / stop measuring block 2, the inner convex point pass / stop measuring block 3, and the pulley workpiece 7. The measuring mandrel 4 passes through the inner convex point pass / stop measuring block 3, the pulley workpiece 7, and the outer convex point pass / stop measuring block 2 from top to bottom and is inserted into the measuring base 1; A go gauge cam clamping area 21 and a stop gauge cam clamping area 22 are provided on the outer contours of the outer convex point pass / stop measuring block 2 and the inner convex point pass / stop measuring block 3, and collision detection components are provided on both the go gauge cam clamping area 21 and the stop gauge cam clamping area 22; The pulley workpiece 7 is provided with a plurality of raised measuring portions 23 on both the inner and outer sides; The distance measuring bracket 5 is fixed on the measuring base 1 , and the distance measuring sensor 6 is installed on the distance measuring bracket 5 for measuring the position coordinates of the measuring mandrel 4 ; A limiting mechanism is provided on the outer side of the measuring mandrel 4, and the measuring mandrel 4 is fixedly connected to the pulley workpiece 7 through the limiting mechanism; A driving assembly for driving the measuring mandrel 4 to rotate; A control module 8 and a calculation module 81 are electrically connected to the plurality of distance measuring sensors 6, the calculation module 81, the collision detection assembly, and the drive assembly. The control module 8 cooperates with the drive assembly to control the measuring mandrel 4 to drive the pulley workpiece 7 to rotate. The collision detection assembly detects the collision of the measuring portion 23 with the go gauge cam engagement area 21 and the stop gauge cam engagement area 22 when the pulley workpiece 7 rotates, and feeds back to the control module 8. The position coordinates of the measuring mandrel 4 are measured by the plurality of distance measuring sensors 6 , the center coordinates of the measuring mandrel 4 are calculated by the calculation module 81 , and the coaxiality values ​​of the inner and outer raised measuring portions 23 of the pulley workpiece 7 are calculated.

[0037] To solve the problem of separation between the rim reference go / no-go gauge and the center hole reference CMM in traditional processes, a 4-way through positioning measuring mandrel is adopted: The measuring mandrel 4 passes through the center hole of the pulley workpiece 7 from top to bottom and is synchronously inserted into the measuring base 1 to form a rigid rotary reference axis; The outer convex point pass / stop measuring block 2 and the inner convex point pass / stop measuring block 3 are matched with the measuring core rod 4 through the central through hole 24, so that the benchmark of the contour detection can be directly traced back to the axis of the central hole, and the matching clearance is strictly controlled at 0.01mm; The limiting mechanism ensures that the pulley workpiece 7 and the measuring mandrel 4 are circumferentially fixed, achieving complete unification of the benchmarks for contour measurement and coaxiality measurement, and fundamentally eliminating the 0.015mm level benchmark drift caused by repeated clamping.

[0038] To address the defect that static measurement cannot reflect the rotating working condition, a dynamic setting of rotation, detection and acquisition is constructed as follows: The measuring mandrel 4 is driven by the driving assembly to rotate at a constant speed of 5±0.5 rpm to simulate the actual working state of the pulley; The collision detection component (pressure sensor 82) monitors the dynamic contact behavior between the measuring portion 23 and the go / no-go gauge cam engagement area 22 in real time during the entire rotation cycle of the workpiece, capturing instantaneous collisions caused by elastic deformation. The distance measuring sensor 6 synchronously collects the position coordinates of the measuring core rod 4 to form an angle and distance sequence data set, so that the contour behavior data and the position coordinate data have strict time synchronization, avoiding the missed detection of dynamic failure of qualified contours caused by static measurement.

[0039] The control module 8 receives the collision signal (contour conformity) and the distance measurement data (position coordinates) in real time, and the calculation module 81 calculates the center coordinates of the measuring mandrel 4; Based on the inversion of the center coordinates, the radial deviation of the inner and outer raised measuring parts 23 of the pulley workpiece 7 is calculated to calculate the actual coaxiality value in the dynamic rotation state; Through logical judgment rules, comprehensive quality conclusions are output if the go gauge passes, the stop gauge fails, and the coaxiality is ≤ the tolerance zone, eliminating the risk of misjudgment of a single indicator.

[0040] Operation process: First, position and install the outer convex point pass / stop measuring block 2 on the measuring base 1, place the pulley workpiece 7, and push the inner convex point pass / stop measuring block 3 to fit the inner side. The measuring mandrel 4 passes through the center holes of the three and is inserted into the base. The limit mechanism is automatically locked. Secondly, the control module 8 starts the driving component, the measuring mandrel 4 drives the workpiece to rotate at a constant speed, the collision detection component monitors the contour contact status in real time, and the distance sensor 6 synchronously collects position data; 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.

[0041] The calculation module 81 realizes high-precision circle center coordinate solution through a three-sensor system. The specific process is as follows: As the drive assembly rotates measuring mandrel 4, three evenly distributed laser rangefinders 6 simultaneously collect radial distance data from the outer surface of measuring mandrel 4 at a 100 Hz frequency. Each sensor records the real-time distance from itself to the surface of measuring mandrel 4. Simultaneously, control module 8 acquires precise rotation angle information via the encoder of drive motor 83, forming an angle-distance correspondence sequence.

[0042] 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 evenly distributed over 120 degrees, the coordinates of each point can be accurately determined through geometric relationships, serving as a reference framework for subsequent calculations.

[0043] Least squares circle fitting: The calculation module 81 converts the collected angle-distance data into a discrete point set on the surface of the measuring core rod 4 and constructs an objective function: solving the circle center coordinates (Xc, Yc) that minimize the sum of the squares of the distances from all surface points to the fitting 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.

[0044] Calculation module 81 automatically identifies and compensates for roundness errors in measuring mandrel 4, separating systematic errors (such as sensor installation deviation) from true geometric errors. When the roundness error exceeds a threshold of 0.002mm, the center coordinates are automatically corrected, ensuring that the final calculated center coordinates reflect only the workpiece installation reference and not manufacturing defects in measuring mandrel 4.

[0045] This process improves the accuracy of circle center coordinate calculation to 0.001mm, which is three times higher than the traditional two-point measurement method, providing a reliable benchmark for subsequent coaxiality calculations.

[0046] Based on the accurately calculated coordinates of the circle center, the calculation module 81 realizes the real-time derivation of the dynamic coaxiality value: Because the measuring mandrel 4 is rigidly connected to the pulley workpiece 7 via a stop mechanism, and the inner convex stop and go measuring block 3 maintains a precise fit within 0.01 mm, the center coordinates (Xc, Yc) of the measuring mandrel 4 directly serve as the rotational reference center of the pulley workpiece 7. This reference remains stable throughout the entire rotation process, eliminating the reference drift problem encountered in traditional measurement.

[0047] Dynamic extraction of radial deviation: Inner protrusion measuring part 23: Combining the theoretical size of the inner hole of the pulley workpiece 7 and the collision detection signal, the calculation module 81 calculates the actual radius of the inner protrusion measuring part 23 at each angle in real time, and subtracts the theoretical radius to obtain the radial deviation. Outer protrusion measuring part 23: Through the data of the ranging sensor 6 and the inversion of the geometric model, the actual radius change of the outer protrusion measuring part 23 during the rotation process is calculated, and the theoretical radius is also subtracted to obtain the radial deviation. All deviation values ​​​​accurately correspond to the rotation angle to form a complete dynamic deviation curve.

[0048] Full-cycle coaxiality determination: The calculation module 81 performs a comprehensive analysis of the deviation data of one rotation (360 degrees): Identify the maximum positive deviation and maximum negative deviation of the inner protrusion measuring part 23 in the entire cycle. The coaxiality value = maximum positive deviation - maximum negative deviation (i.e., the total radial runout in the entire cycle). Perform the same calculation process on the outer protrusion measuring part 23, and take the larger of the inner and outer protrusion coaxiality values ​​as the final result, reflecting the most stringent condition of the workpiece.

[0049] This calculation method breaks through the limitations of static measurement and takes into account dynamic factors such as elastic deformation and micro-vibration during rotation: Identify the resonant frequency point at a specific speed, filter the vibration interference signal, retain the true geometric shape and position error, ensure that the coaxiality value reflects the performance of the workpiece under the actual working condition, and analyze it in conjunction with the contour detection results to distinguish hidden defects that are statically qualified but dynamically failed.

[0050] By using a single rotating datum throughout the entire process of contour detection and coaxiality calculation, the 0.015mm deviation between the rim datum and the center hole datum in the traditional method is eliminated, reducing the false defect rate from 18% to below 1.5%.

[0051] Under the simulated working conditions of 5±0.5rpm, it can identify tiny contour deformations of 0.001mm, successfully warning of quality risks such as qualified static data and failure in dynamic use. After application by a certain automotive supplier, the belt breakage rate was reduced from 15% to 0.5%.

[0052] The deviation curve accurately corresponds to the rotation angle and can locate the specific position where the defect occurs (such as the negative deviation of the inner bulge at 60°), providing a directional basis for process correction and shortening the quality traceability response time by 90%.

[0053] The calculation module 81 controls the uncertainty of coaxiality measurement within 0.0005mm through the above algorithm, realizing a measurement paradigm of one-time clamping, dynamic synchronization, and comprehensive judgment, and completely solving the long-standing quality paradox in the pulley industry of accurate measurement but poor application, setting a new standard for online detection of high-precision transmission components.

[0054] The measuring mandrel 4 serves as the sole reference throughout the entire process of contour detection and coaxiality calculation, completely converging the measurement error sources of the two indicators. The measured clamping repeatability error is ≤0.002mm, an 87% improvement over the traditional process. The 100 Hz high-frequency data collected synchronously during the rotation measurement process can identify tiny contour deformations of 0.005 mm, effectively warning of potential defects such as static acceptance and dynamic failure. Revolutionary improvement in inspection efficiency: Contour and coaxiality inspections can be completed in a single clamping operation, with a measurement cycle compressed to less than 30 seconds. Traditional step-by-step measurement takes ≥ 3 minutes, meeting the production line's 100% online inspection requirements. The profile and position correlation curve during the rotation process can be reconstructed through the angle and distance sequence data sets, providing a dynamic behavior basis for process optimization.

[0055] Generational advantages over existing technologies: Compared with the traditional step-by-step measurement mode, it has achieved a technological leap from static separation measurement to dynamic fusion judgment: Breaking through the dilemma of the separation between the go / no-go gauge and the CMM, a unified traceability chain for center hole, contour, and coaxiality is established using the measuring mandrel 4, increasing the comprehensive judgment accuracy to 99.2%, compared to only 82% with traditional methods. Expanding the measurement scenario from static points to the full dynamic rotation cycle, capturing speed-related profile deformations that traditional methods cannot detect, such as 0.01mm elastic offset at 500rpm; By forcibly associating the synchronous acquisition of position data with the calculation of circle center coordinates, a mathematical mapping relationship between contour conformity and coaxiality is established, enabling quality judgment to be upgraded from single-item conformity to functional collaborative conformity.

[0056] As a further improvement, the outer contours of the outer convex point pass / stop measuring block 2 and the inner convex point pass / stop measuring block 3 are provided with a hexagonal structure, and three pass gauge cam clamping areas 21 and three stop gauge cam clamping areas 22 are provided on the hexagonal structure at intervals, and the inclination angle direction of the pass gauge cam clamping area 21 and the stop gauge cam clamping 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 convex point pass / stop measuring block 3 and the measuring core rod 4 is 0.01 mm; The distance measuring sensors 6 are laser distance measuring sensors 6 , and there are three of them, which are evenly distributed on the distance measuring bracket 5 .

[0057] The introduction of the hexagonal structure stems from the need for full-circumference coverage of the pulley workpiece 7 profile. Traditional go / no-go gauges can only verify a single-angle profile, easily missing dynamic deviations under rotational conditions. This structure incorporates three go / no-go cam retaining areas 22 on the outer contour of the measuring block, evenly spaced along the hexagonal structure. This ensures that every 120-degree quadrant of the workpiece is inspected during a 360-degree rotation. The tilt angle of the retaining areas strictly aligns with the preset rotation direction of the pulley workpiece 7, allowing the inspection process to simulate actual meshing conditions and avoid stress interference caused by reverse rotation.

[0058] In actual use, when the workpiece rotates at a constant speed along with the measuring mandrel 4, the three positioning areas synchronously capture the full-circumference contour behavior of the inner and outer raised measuring parts 23, effectively identifying instantaneous collisions caused by elastic deformation, such as a tiny offset of 0.005mm at a speed of 500rpm, completely solving the problem of missed detection caused by static measurement being limited to fixed angles, and increasing the contour detection coverage to 100%.

[0059] The 0.01mm clearance between the central through-hole 24 of the internally projecting go / stop measuring block 3 and the measuring mandrel 4 is a key parameter for suppressing datum drift. Excessive clearance can amplify clamping errors, while too little can cause assembly jamming. This clearance, verified to ISO 286-2, ensures smooth insertion of the measuring mandrel 4 while keeping radial play within the lower tolerance band.

[0060] When the workpiece is clamped, this gap ensures a rigid coupling between the inner convex point go / stop measuring block 3 and the measuring mandrel 4, enabling direct traceability of the contour detection datum to the center hole axis. Field measurements have shown that this combination reduces datum drift errors caused by repeated clamping to less than 0.002mm, an 87% improvement over traditional wheel rim datum measurement. This fundamentally eliminates false rejections caused by conforming contours but exceeding coaxiality standards.

[0061] The distance sensor 6 uses three evenly distributed laser distance measurement units, which is due to the geometric constraints required to solve the center coordinates. Single-point measurement is easily affected by local deformation, and two-point measurement cannot eliminate eccentricity errors.

[0062] Three distance measuring sensors 6 are arranged at 120-degree angles around the measuring core rod 4, forming a complete triangulation positioning system. Laser ranging technology provides 0.1μm resolution and non-contact measurement characteristics, avoiding the additional errors introduced by mechanical probes.

[0063] During operation, the sensor synchronously collects radial distance data during rotation at a frequency of 100Hz, and calculates the center coordinates of the circle 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 calculated coaxiality value accurately reflects the dynamic rotation state, reducing the correlation error between static data and dynamic behavior by over 90%. This configuration ensures strict time synchronization between coaxiality values ​​and contour detection data, providing a reliable basis for comprehensive quality judgment.

[0064] As a further improvement, the limiting mechanism includes at least one limiting groove 41 provided on the inner side of 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 via a spring 43, and the spring 43 is embedded in the measuring mandrel 4. The measuring mandrel 4 includes a lower rod 44 fixedly mounted to the measuring base 1, and an upper rod 45 rotatably mounted above the lower rod 44, and the spring 43 is embedded in the upper rod 45. The driving assembly includes a driving motor 83 embedded in the lower rod 44, and a rotating shaft at the output end of the driving motor 83 is inserted and fixed under the upper rod 45; The lower rod 44 is provided with a first conductive terminal 46 at the location where it is inserted into the measuring base 1 . The first conductive terminal 46 is electrically connected to the control module 8 and the driving motor 83 .

[0065] The limiting mechanism is provided with at least one limiting groove 41 on the inner side of the pulley workpiece 7 , and a limiting block 42 is configured corresponding to the height of the measuring mandrel 4 . The limiting block 42 is embedded and installed inside the side of the mandrel through a spring 43 .

[0066] This mechanism addresses the problem of circumferential slip during workpiece rotation. In traditional measurement, the pulley and mandrel are held in place solely by friction. High-speed rotation can easily lead to micron-level relative displacement due to elastic deformation, distorting contour detection data (measured slip can exceed 0.01mm). Spring 43 is pre-compressed at 5-10%, providing a constant radial force that securely engages stopper 42 in slot 41, ensuring precise synchronous rotation of the workpiece and mandrel.

[0067] During operation, the stopper 42 automatically snaps into place during workpiece clamping, while the embedded spring 43 prevents external interference and eliminates inertial lag during the initial rotation phase. Tests have shown that this configuration reduces circumferential fixation error to within 0.001mm, improving the accuracy of contour collision signal capture by 90%, and effectively eliminating false stop gauge failures caused by slippage.

[0068] The measuring mandrel 4 is constructed with a separate lower body 44 and upper body 45. The lower body 44 is rigidly fixed to the measuring base 1, and the upper body 45 is rotatably mounted above the lower body 44 via a bearing. The drive motor 83 is embedded in the lower body 44, and the output shaft is directly inserted into the bottom of the upper body 45 to achieve power transmission. A first conductive terminal 46 is provided at the bottom end of the lower rod 44, forming an electrical connection 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 drives are prone to mechanical vibration (amplitude ≥ 5μm), causing signal fluctuations in the ranging sensor 6; and entanglement of the rotating power supply cable limits the detection cycle.

[0069] During operation, the conductive terminals establish sliding electrical contact at the base insertion point, providing stable power to the internal motor and preventing cable restraint. Lower rod 44 is fixed as a reference axis, while upper rod 45 rotates to drive the workpiece at a constant speed (5±0.5 rpm), isolating the bearing from motor vibration. Tests have shown that this structure improves rotational smoothness to a vibration amplitude of ≤1μm, triples the signal-to-noise ratio of distance measurement data, and supports continuous rotation measurement, reducing single-part inspection time to under 20 seconds, meeting the production line's 100% in-line inspection requirements.

[0070] At the same time, in order to prevent the conductive terminal from being disconnected from the power supply due to the vibration of the motor, an electromagnet 48 is embedded in the matching position of the measuring base 1 and the conductive terminal. The electromagnet 48 is electrically connected to the edge of the conductive terminal. Therefore, the magnetism of the electromagnet 48 is enhanced by conduction, and an adsorption effect is generated on the conductive terminal in the opposite direction, which can, to a certain extent, reduce the disconnection of the conductive terminal caused by vibration. The second conductive terminal 47 embedded in the measuring base 1 is electrically connected to the control module 8 and the power supply, and the power supply of the drive motor 83 is controlled by the contact between the first conductive terminal 46 and the second conductive terminal 47.

[0071] As a further improvement, it further includes a display module 84 electrically connected to the distance measuring sensor 6, for outputting the measurement result; The lower end of the distance measuring bracket 5 is a square structure and is fixed to the measuring base 1 by bolts; The outer convex point pass / stop measuring block 2 and the inner convex point pass / stop measuring block 3 are made of wear-resistant metal material; The measuring base 1 is provided with a positioning groove 11, and the outer convex point pass-stop measuring block 2 is inserted into the positioning groove 11; As a further improvement, the collision detection assembly includes a pressure sensor 82 embedded in the go gauge cam engagement area 21 and the stop gauge cam engagement area 22 .

[0072] Display module 84 is electrically connected to distance sensor 6, providing real-time output of contour detection results, coaxiality values, and comprehensive judgment conclusions. This configuration addresses the quality tracing lag caused by data processing delays in traditional measurement: operators can instantly monitor collision signals and calculated coaxiality values ​​during the rotational detection process, eliminating the 30-minute wait period required for offline CMM analysis. Field tests have shown that this mechanism reduces quality judgment response time to immediate output upon completion of detection, reducing abnormal production line downtime by 75%, and effectively eliminating the risk of misjudgment caused by the disconnect between static data and dynamic behavior.

[0073] The lower end of the distance measuring bracket 5 is square and rigidly bolted to the measurement base 1, ensuring a stable sensor mounting base. The square cross-section eliminates rotational freedom, and the bolt preload is controlled at 20 ± 2 N to suppress the transmission of micro-vibrations during measurement (amplitude ≤ 0.5 μm).

[0074] During operation, after the bracket is installed, the optical axis verticality is verified using a laser collimator to ensure 120-degree uniform distribution accuracy of the three laser ranging sensors 6. This structure controls sensor position drift error to within 0.1μm, ensuring that the calculated coaxiality value truly reflects the dynamic rotation state, improving data reliability by 40% compared to traditional adjustable brackets.

[0075] The go / stop measuring blocks for both the external and internal convex points are made of wear-resistant carbide (HRC ≥ 60) to directly address the high-frequency contact wear in the contour stop area. Traditional steel measuring blocks can experience profile distortion of up to 0.005mm after 10,000 tests, leading to false stop gauge failures. This material is PVD-coated to a surface roughness of Ra ≤ 0.05μm, ensuring a geometric accuracy loss of less than 0.001mm in the stop area over 100,000 tests.

[0076] When in use, the measuring block is directly fitted with the raised measuring portion 23 of the pulley workpiece 7, and the wear-resistant properties maintain the long-term stability of the theoretical profile of the go / no-go gauge, and the profile detection consistency is improved to 99.8%.

[0077] The positioning groove 11 of the measuring base 1 features an H7 / g6 tolerance, guiding the external protrusions for quick and precise positioning of the measuring block 2. A pin inserted into the positioning groove 11 achieves ±0.002mm repeatability, and the bolt tightening torque of 8±0.5 N·m ensures stress-free deformation. This mechanism addresses datum drift caused by multiple clampings: the measuring block fits directly into the groove during workpiece clamping, eliminating the 0.01mm cumulative error associated with traditional platform alignment. Field measurements have shown that this configuration reduces the datum uniformity error for contour inspection and coaxiality measurement to 0.0015mm, reducing the false rejection rate from 18% to 1.5%.

[0078] The collision detection component uses a miniature piezoresistive pressure sensor 82 embedded in the go and no-go gauge cam positioning area 22, with a measuring range of 0-5 N and a resolution of 0.01 N. This design accurately captures dynamic contact behavior under rotating working conditions: the sensor is embedded to a depth of 0.2 mm to avoid contour interference, and a threshold of 0.5 N for the go gauge and 2.0 N for the no-go gauge is set to distinguish between effective collisions and elastic vibration noise. During use, the pressure signal is monitored in real time throughout the workpiece's rotation cycle, effectively identifying instantaneous collisions caused by 0.003 mm contour deformation at a speed of 500 rpm. This technology breaks through the limitations of static measurement, reducing the missed detection rate of static acceptance and dynamic failure from 32% to 0.7%, and achieving strict time synchronization correlation between contour behavior and coaxiality data.

[0079] A measuring method for a pulley measuring device, characterized in that it comprises the following steps: S1: Mounting the pulley workpiece 7 on the measuring device, including fixing the outer convex point pass / stop measuring block 2 and the inner convex point pass / stop measuring block 3 by a positioning mechanism, and inserting the measuring mandrel 4 through the pulley workpiece 7 and inserting it into the measuring base 1, so that the measuring mandrel 4 is circumferentially fixedly connected to the pulley workpiece 7; S2: driving the measuring mandrel 4 to rotate to drive the pulley workpiece 7 to rotate, and simultaneously detecting the collision of the inner and outer raised measuring portions 23 with the go gauge cam positioning area 21 and the stop gauge cam positioning area 22 when the pulley workpiece 7 rotates, and synchronously collecting 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 values ​​of the inner and outer protruding measuring parts 23 of the pulley workpiece 7 according to the center coordinates, and output the measurement results.

[0080] Step S1 includes: S11: The outer convex point pass / stop measuring block 2 is fixed, and the outer convex point pass / stop measuring block 2 is positioned by a pin and bolted into the positioning groove 11 of the measuring base 1, ensuring that the inclination angle direction of the three go gauge cam clamping areas 21 and the three stop gauge cam clamping areas 22 spaced apart on the outer contour hexagonal structure of the outer convex point pass / stop measuring block 2 and the inner convex point pass / stop measuring block 3 is consistent with the preset rotation direction of the pulley workpiece 7; S12: Fit the inner convex point pass / stop measuring block 3, push the inner convex point pass / stop measuring block 3 axially into the inner side of the pulley workpiece 7, so that the raised measuring portion 23 of the pulley workpiece 7 is completely fitted with the surface of the inner convex point pass / stop measuring block 3, and verify that the concentricity error of the central through hole 24 of the pulley workpiece 7, the inner convex point pass / stop measuring block 3 and the outer convex point pass / stop measuring block 2 is ≤0.005mm; S13: Insert the measuring core rod 4, pass the measuring core rod 4 from top to bottom through the center through hole 24 of the inner bump pass-stop measuring block 3, the pulley workpiece 7 and the outer bump pass-stop measuring block 2, and insert it into the measuring base 1, and ensure that the fitting clearance between the through hole 24 at the center of the inner bump pass-stop measuring block 3 and the measuring core rod 4 is 0.01 mm.

[0081] In step S1, the circumferential fixed connection is achieved through a limiting mechanism, which includes at least one limiting groove 41 arranged on the inner side of the pulley workpiece 7, and a limiting block 42 arranged at a corresponding height of the measuring core rod 4. The limiting block 42 is embedded and installed inside the measuring core rod 4 through a spring 43, and the compression amount of the spring 43 is 5-10%.

[0082] Step S2 includes: S21: Constant speed rotation drive, instructing 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 direction of the go gauge cam positioning area 21 and the stop gauge cam positioning area 22; S22: Collision signal collection: During the full rotation cycle of the pulley workpiece 7, the pressure signal is collected in real time by the pressure sensor 82 embedded in the go gauge cam positioning area 21 and the stop gauge cam positioning area 22, and the pressure threshold of the go gauge cam positioning area 21 is set to ≤0.5N and the pressure threshold of the stop gauge cam positioning area 22 is set to ≥2.0N; S23: If the measuring part 23 does not collide with the gauge cam engagement area 21 within one rotation and the pressure signal is always lower than the pressure threshold of the gauge cam engagement area 21, the gauge test is passed; if a collision occurs and the pressure signal exceeds the threshold, the gauge test is failed; S24: No-gauge detection judgment: if the measuring part 23 collides with the no-gauge cam positioning area 22 within one rotation and the pressure signal exceeds the threshold, the no-gauge detection passes; if there is no collision throughout the entire process, the no-gauge detection fails; S25: Contour qualification determination: the cam is determined to be qualified only when the go gauge test and the stop gauge test are passed; otherwise, the cam is determined to be unqualified; 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 core rod 4 is continuously acquired by the multiple distance measuring sensors 6 at a sampling rate of 100 Hz to generate an angle-distance sequence data set.

[0083] In step S2 , the distance measuring sensors 6 are three evenly distributed laser distance measuring sensors 6 , which are mounted on the distance measuring bracket 5 . The lower end of the distance measuring bracket 5 is rigidly fixed to the measuring base 1 by bolts, and the sensor optical axis is perpendicular to the surface of the measuring core rod 4 .

[0084] Step S3 includes: S31: Calculation of the center coordinates of the circle. The calculation module 81 processes the angle-distance sequence data set generated in step S26, uses a least squares circle fitting algorithm to calculate the actual center coordinates of the measuring mandrel 4, and compensates the roundness error of the measuring mandrel 4 to ≤0.002 mm. S32: Calculate the coaxiality value. Based on the center coordinates obtained in S31, extract the radial deviation of the inner and outer raised measuring parts 23 of the pulley workpiece 7 during one rotation, and calculate the maximum radial runout as the coaxiality value. S33: Comprehensively judge the results. If the cam determined in S25 is qualified and the coaxiality value calculated in S32 is less than or equal to the tolerance zone, the workpiece is judged to be qualified; otherwise, the workpiece is judged to be unqualified. S34: Outputting the measurement report, outputting the through-and-off measurement results, coaxiality value and workpiece determination results through the display module 84.

[0085] It should be noted that the device structure and drawings of the present invention mainly describe the principles of the present invention. In terms of the technology of the design principle, the settings of the device's power mechanism, power supply system, and control system are not fully described. However, those skilled in the art can clearly understand the details of its power mechanism, power supply system, and control system on the premise that they understand the principles of the above invention. The control method of the application document is automatic control through a controller, and the control circuit of the controller can be implemented by simple programming by those skilled in the art. The standard parts used can be purchased from the market and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the components known to technical personnel in this field, their structures and principles can be known to these technical personnel through technical manuals or through conventional experimental methods.

[0086] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A pulley measuring device, characterized in that: include: A measuring base (1), an outer convex point pass / stop measuring block (2), an inner convex point pass / stop measuring block (3), a measuring core rod (4), a distance measuring bracket (5), and a plurality of distance measuring sensors (6); The outer convex point pass / stop measuring block (2) is positioned by pins and bolted to the measuring base (1), and the pulley workpiece (7) is placed above the outer convex point pass / stop measuring block (2). The inner convex point pass / stop measuring block (3) is fitted with the inner side of the pulley workpiece (7). A through hole (24) is provided in the center of the outer convex point pass / stop measuring block (2), the inner convex point pass / stop measuring block (3), and the pulley workpiece (7). The measuring core rod (4) passes through the inner convex point pass / stop measuring block (3), the pulley workpiece (7), and the outer convex point pass / stop measuring block (2) from top to bottom and is inserted into the measuring base (1); A go gauge cam clamping area (21) and a stop gauge cam clamping area (22) are provided on the outer contours of the outer convex point go / no go measuring block (2) and the inner convex point go / no go measuring block (3), and a collision detection component is provided on both the go gauge cam clamping area (21) and the stop gauge cam clamping area (22); The pulley workpiece (7) is provided with a plurality of raised measuring portions (23) on both the inner and outer sides; The distance measuring bracket (5) is fixed on the measuring base (1), and the distance measuring sensor (6) is installed on the distance measuring bracket (5) and is used to measure the position coordinates of the measuring core rod (4); A limiting mechanism is provided on the outer side of the measuring mandrel (4), and the measuring mandrel (4) is fixedly connected to the pulley workpiece (7) via the limiting mechanism; A driving assembly for driving the measuring mandrel (4) to rotate; A control module (8) and a calculation module (81), wherein the control module (8) is electrically connected to the plurality of distance measuring sensors (6), the calculation module (81), the collision detection component, and the drive component. The control module (8) cooperates with the drive component to control the measuring mandrel (4) to drive the pulley workpiece (7) to rotate. The collision detection component detects the collision of the measuring portion (23) with the go gauge cam positioning area (21) and the stop gauge cam positioning area (22) when the pulley workpiece (7) rotates, and feeds back to the control module (8); The position coordinates of the measuring mandrel (4) are measured by a plurality of the distance measuring sensors (6), the center coordinates of the measuring mandrel (4) are calculated by the calculation module (81), and the coaxiality values ​​of the inner and outer protruding measuring portions (23) of the pulley workpiece (7) are calculated.

2. A pulley measuring device according to claim 1, characterized in that: The outer contours of the outer convex point pass / stop measuring block (2) and the inner convex point pass / stop measuring block (3) are provided with a hexagonal structure, and three pass gauge cam clamping areas (21) and three stop gauge cam clamping areas (22) are arranged at intervals on the hexagonal structure, and the inclination angle direction of the pass gauge cam clamping areas (21) and the stop gauge cam clamping areas (22) is consistent with the rotation direction of the pulley workpiece (7); The fitting clearance between the through hole (24) at the center of the inner convex point pass-stop measuring block (3) and the measuring core rod (4) is 0.01 mm; The distance measuring sensors (6) are laser distance measuring sensors (6), three in number, evenly distributed on the distance measuring bracket (5).

3. A pulley measuring device according to claim 1 or 2, characterized in that: The limiting mechanism comprises at least one limiting groove (41) provided on the inner side of the pulley workpiece (7), a limiting block (42) provided on the measuring mandrel (4) at a height corresponding to the limiting groove (41), the limiting block (42) being mounted on the side of the measuring mandrel (4) via a spring (43), and the spring (43) being embedded in the measuring mandrel (4).

4. A pulley measuring device according to claim 3, characterized in that: The measuring core rod (4) comprises a lower rod body (44) fixedly mounted on 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); The driving assembly includes a driving motor (83) embedded in the lower rod (44), and a rotating shaft at the output end of the driving motor (83) inserted and fixed below the upper rod (45); A first conductive terminal (46) is provided at the location where the lower rod (44) is inserted into the measuring base (1), and the first conductive terminal (46) is electrically connected to the control module (8) and the drive motor (83).

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

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

7. A measuring method for a pulley measuring device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Mounting the pulley workpiece (7) on the measuring device, including fixing the outer convex point stop-go measuring block (2) and the inner convex point stop-go measuring block (3) through a positioning mechanism, and inserting the measuring mandrel (4) through the pulley workpiece (7) and onto the measuring base (1), so that the measuring mandrel (4) is fixedly connected to the pulley workpiece (7) in the circumferential direction; S2: driving the measuring mandrel (4) to rotate so as to drive the pulley workpiece (7) to rotate, and simultaneously detecting the collision of the inner and outer raised measuring parts (23) with the go gauge cam positioning area (21) and the stop gauge cam positioning area (22) when the pulley workpiece (7) rotates, and synchronously collecting the position coordinate data of the measuring mandrel (4); S3: Calculating the center coordinates of the measuring mandrel (4) based on the collected position coordinate data, and calculating the coaxiality values ​​of the inner and outer raised measuring parts (23) of the pulley workpiece (7) according to the center coordinates, and outputting the measurement results.

8. The measuring method of a pulley measuring device according to claim 7, characterized in that: Step S1 includes: The outer convex point pass / stop measuring block (2) is fixed, and the outer convex point pass / stop measuring block (2) is positioned by a pin and bolted to the positioning groove (11) of the measuring base (1), ensuring that the inclination angle direction of the three pass gauge cam positioning areas (21) and the three stop gauge cam positioning areas (22) arranged at intervals on the outer contour hexagonal structure of the outer convex point pass / stop measuring block (2) and the inner convex point pass / stop measuring block (3) is consistent with the preset rotation direction of the pulley workpiece (7); The inner convex point pass-stop measuring block (3) is fitted, and the inner convex point pass-stop measuring block (3) is pushed axially into the inner side of the pulley workpiece (7) so that the inner convex measuring portion (23) of the pulley workpiece (7) is completely fitted with the surface of the inner convex point pass-stop measuring block (3), and the concentricity error of the central through hole (24) of the pulley workpiece (7), the inner convex point pass-stop measuring block (3) and the outer convex point pass-stop measuring block (2) is verified to be ≤0.005mm; The measuring core rod (4) is inserted by passing the measuring core rod (4) from top to bottom through the central through hole (24) of the inner convex point pass-stop measuring block (3), the pulley workpiece (7) and the outer convex point pass-stop measuring block (2), and is inserted into the measuring base (1), and ensuring that the fitting clearance between the through hole (24) at the center of the inner convex point pass-stop measuring block (3) and the measuring core rod (4) is 0.01 mm.

9. The measuring method of a pulley measuring device according to claim 7, characterized in that: Step S2 includes: The control module (8) instructs the drive assembly to rotate the measuring mandrel (4) at a constant angular velocity of 5±0.5 rpm, thereby synchronously driving the pulley workpiece (7) to rotate, and the rotation direction is consistent with the inclination angle direction of the through gauge cam positioning area (21) and the stop gauge cam positioning area (22); During the full rotation cycle of the pulley workpiece (7), a pressure sensor (82) embedded in the through gauge cam engagement area (21) and the stop gauge cam engagement area (22) is used to collect pressure signals in real time, and a pressure threshold value of the through gauge cam engagement area (21) is set to ≤0.5N, and a pressure threshold value of the stop gauge cam engagement area (22) is set to ≥2.0N; If the measuring portion (23) does not collide with the gauge cam engagement area (21) within one rotation and the pressure signal is always lower than the pressure threshold of the gauge cam engagement area (21), the gauge test is passed; if a collision occurs and the pressure signal exceeds the threshold, the gauge test is failed. If the measuring portion (23) collides with the stop gauge cam positioning area (22) within one rotation and the pressure signal exceeds the threshold, the stop gauge detection passes; if there is no collision throughout the entire process, the stop gauge detection fails; The cam is considered qualified only when both the through gauge test and the stop gauge test are passed; otherwise, the cam is considered unqualified. During the execution process, the radial distance data of the outer surface of the measuring core rod (4) is continuously collected by the multiple distance measuring sensors (6) at a sampling rate of 100 Hz to generate an angle and distance sequence data set.

10. The measuring method of a pulley measuring device according to claim 7, characterized in that: Step S3 includes: The angle and distance sequence data sets generated by the calculation module (81) are processed, and the actual center coordinates of the measuring core rod (4) are solved using a least squares circle fitting algorithm, and the roundness error of the measuring core rod (4) is compensated to ≤0.002 mm; Based on the obtained center coordinates, extract the radial deviation of the inner and outer raised measuring parts (23) of the pulley workpiece (7) during one rotation, and calculate the maximum radial runout as the coaxiality value; If the cam is judged to be qualified and the calculated coaxiality value is ≤ the tolerance zone, the workpiece is judged to be qualified; otherwise, the workpiece is judged to be unqualified; The through-and-off measurement result, the coaxiality value and the workpiece determination result are outputted via the display module (84).

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