Automobile sunroof on-line detection tool and detection method

Abstract

This invention discloses an online inspection fixture and method for automotive sunroofs. The fixture, positioned above the sunroof conveyor line, includes a crossbeam and several contour detection devices evenly distributed along the length of the crossbeam. Each detection device includes at least a displacement sensor and a roller that rolls in contact with the upper surface of the sunroof. The roller's rolling axis is perpendicular to the sunroof's conveying direction, ensuring low-friction rolling contact. All the contour detection devices together form a multi-point contact contour detection array. This array is used to simultaneously collect relative displacement data of several sampling points in the vertical direction along the width of the sunroof during continuous conveying, forming multiple longitudinal contour data sequences. These data sequences collectively constitute the overall curvature contour data of the sunroof. This invention overcomes the problems of complexity and low efficiency in traditional contact-based inspection processes, achieving continuous online inspection of the sunroof contour.

Description

Technical Field

[0001] This invention relates to the field of automotive sunroof testing technology, specifically to online testing fixtures and methods for automotive sunroofs. Background Technology

[0002] As a key component of modern automobiles, the precision of the sunroof's geometry and curvature directly affects the vehicle's sealing, wind noise performance, and appearance. Even minor deviations in curvature or contour can lead to functional defects after assembly. Currently, the inspection of sunroofs and their key components primarily employs two main technical approaches:

[0003] One method is non-contact optical inspection: This method typically utilizes technologies such as laser scanning, structured light, or machine vision to rapidly acquire surface point cloud data without contacting the workpiece. The advantage of this method is its speed and, theoretically, no damage to the workpiece. However, the glass, a core component of the sunroof, has high reflectivity and high light transmittance. This significantly interferes with the signal-to-noise ratio and measurement stability of the optical system, resulting in low-quality point cloud data and measurement accuracy and robustness that fail to meet the stringent requirements of the production line for critical curvature.

[0004] Secondly, there is contact inspection: Traditional contact inspection mainly relies on customized inspection stations and complex inspection fixtures. The typical process involves transferring the sunroof glass or assembly from the main conveyor line to a separate inspection station. At this station, a fixture containing an array of contact sensors (such as LVDTs or electron probes) is pressed downwards against the glass surface, collecting a set of discrete vertical height data through the array. The advantage of this method is its high accuracy and immunity to optical interference. However, its disadvantages include a complex process requiring additional transfer, positioning, and locking steps, and the risk of scratching the high-gloss glass surface when the contact probes are pressed or slid.

[0005] More importantly, regardless of the method mentioned above, in actual production, it is currently still mainly limited to sampling inspection. Traditional contact inspection, due to its complex station transfer and bonding actions, cannot achieve continuous and uninterrupted online measurement, which greatly limits the cycle time of the production line.

[0006] While non-contact detection has the potential for continuous measurement, it is limited by the optical properties of the glass surface and cannot provide data with high stability and high reliability. Summary of the Invention

[0007] The purpose of this invention is to provide an online inspection fixture and method for automotive sunroofs, in order to solve the technical problems of insufficient accuracy and robustness of non-contact inspection in the prior art due to the high reflectivity and high light transmittance of sunroof glass, and the difficulty in achieving continuous online measurement due to the complexity of traditional contact inspection processes.

[0008] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0009] An online inspection fixture for automotive sunroofs is provided, positioned above the sunroof conveyor line. The inspection fixture includes:

[0010] The crossbeam is fixedly installed directly above the sunroof conveyor line, with its length direction perpendicular to the conveying direction of the sunroof conveyor line.

[0011] A contour detection device is set on the crossbeam and there are several of them. All contour detection devices are evenly distributed along the length of the crossbeam.

[0012] The contour detection device includes at least:

[0013] The displacement sensor is set vertically with its probe end pointing downwards.

[0014] The roller is mounted on the probe end of the displacement sensor. The roller rolls and contacts the upper surface of the sunroof throughout the entire process as the sunroof passes by. The rolling axis of the roller is perpendicular to the conveying direction of the sunroof.

[0015] All contour detection devices together form a multi-point contact contour detection array, which is used to simultaneously collect the relative displacement data of several sampling points in the vertical direction in the width direction of the sunroof during the continuous conveying process of the sunroof.

[0016] The relative displacement data continuously form multiple longitudinal contour data sequences along the length of the skylight. These multiple longitudinal contour data sequences correspond to parallel sampling trajectories along the width of the skylight. Together, these multiple longitudinal contour data sequences constitute the overall curvature contour data of the skylight.

[0017] Furthermore, a lifting mechanism is fixedly installed on the side of the displacement sensor, and the lifting movable end of the lifting mechanism is fixedly connected to the probe end of the displacement sensor.

[0018] The roller is connected to the bottom of the lifting movable end of the lifting mechanism via a U-shaped roller seat. The open end of the U-shaped roller seat faces downward, and the roller's fixed shaft is connected inside the U-shaped roller seat.

[0019] Furthermore, the lifting mechanism includes:

[0020] Two linear bearing housings are fixedly installed on the crossbeam at longitudinal intervals.

[0021] The guide rod is set vertically and passes through two linear bearing seats;

[0022] The U-shaped roller seat is fixedly installed at the bottom of the guide rod, and the lower end of the guide rod is fixedly connected to the probe end of the displacement sensor through a bridging component.

[0023] Furthermore, a spring is fitted around the guide rod, located between two linear bearing seats. The upper end of the spring abuts against the bottom of the upper linear bearing seat. A lockable limiting ring is fixedly fitted onto the guide rod. Under the weight of the guide rod, the limiting ring adheres to the top of the lower linear bearing seat, and the lower end of the spring abuts against the top of the limiting ring.

[0024] Furthermore, a camshaft is connected to the upper end of the guide rod, and a radial through hole is formed at the upper end of the guide rod for the journal of the camshaft to pass through. An external thread is formed on the outer wall of the journal of the camshaft. After the journal of the camshaft passes through the radial through hole, a flange nut is screwed on. A stepped shaft is formed on the journal of the camshaft. The flange nut and the stepped shaft lock the camshaft and the guide rod together. The cam profile of the camshaft is facing downward and fits against the top surface of the linear bearing seat above. A wrench hole is formed at the end of the camshaft away from the flange nut.

[0025] Furthermore, a bracket is fixedly fitted on the guide rod, and an extension arm extending upward at an angle is formed on the bracket. A laser rangefinder is installed at the end of the extension arm. The detection optical path of the laser rangefinder is directly facing the outer contour surface of the roller to detect the distance between the outer surface of the roller and the laser rangefinder in real time.

[0026] Furthermore, one end of the bracket is attached to the top of the bridging component, and the bridging component is attached downward to the top of the U-shaped roller seat. Fixed side plates are respectively provided on both sides of the U-shaped roller seat. The fixed side plates are fixedly connected to the U-shaped roller seat and the bridging component. The upper edge of the fixed side plate protrudes from the top surface of the bridging component. The two sides of the bracket that are attached to the bridging component are respectively attached to the protruding ends of the fixed side plates on both sides to form a circumferential limit on the bracket. A limiting component that presses the bracket downward is sleeved on the guide rod.

[0027] Furthermore, the sidewall of the limiting member has a support portion extending in the direction of the extension arm, and the bottom end of the support portion has an angled portion that matches the inclined surface of the extension arm. The extension arm and the support portion are fixedly connected by screws to ensure the relative position of the laser rangefinder at the end of the extension arm is stable.

[0028] Furthermore, the distance between the bridging component and the bottom of the crossbeam is greater than the active detection stroke of the probe end of the displacement sensor.

[0029] A testing method based on this online testing fixture for automotive sunroofs, the method comprising the following steps:

[0030] S1, Preparation and Calibration: Fix the sunroof of the car onto a special vehicle and preset the height of the sunroof on the vehicle so that the leading edge of the sunroof has a low-impact, progressive contact roller array height relationship; perform zero-position calibration and array consistency calibration on all displacement sensors in the multi-point contact contour detection array.

[0031] S2, Conveying and Contact: The sunroof is smoothly conveyed to the detection position through a precision conveying structure, and its roller array makes full rolling contact with the upper surface of the sunroof.

[0032] S3, Parallel Data Acquisition: During the process of the skylight passing through the detection position, the following sub-steps are executed simultaneously:

[0033] S3a, Main contour acquisition: The contour detection array synchronously acquires the original relative displacement data of several sampling points in the vertical direction along the width of the sunroof;

[0034] S3b, Roller wear monitoring: The laser rangefinder continuously or periodically detects the outer contour surface of the roller in real time to obtain the vertical wear of the roller;

[0035] S4, Data Processing and Compensation: The raw relative displacement data collected in S3a is dynamically compensated in real time using the vertical loss obtained in S3b to obtain corrected relative displacement data; the corrected relative displacement data continuously forms multiple longitudinal contour data sequences in the direction of the skylight length.

[0036] S5, Contour Judgment: The data processing module compares the overall curvature contour data composed of multiple longitudinal contour data sequences with the theoretical curvature contour data of the sunroof design model. If the deviation exceeds the preset tolerance range, the contour of the car sunroof is determined to be unqualified.

[0037] The beneficial effects of this invention are:

[0038] This invention overcomes the technical challenge of existing contact inspection technologies, which require transferring workpieces to independent inspection stations for random sampling and cannot achieve continuous online measurement. By setting up several rolling contact contour detection devices above the sunroof conveyor line, the roller array achieves full rolling contact with the sunroof surface. During the continuous conveying of the sunroof, multiple longitudinal relative displacement data are collected simultaneously using displacement sensors. This invention enables continuous and efficient full inspection of all sunroof glass passing through the production line. Attached Figure Description

[0039] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0040] Figure 1 This is a top view schematic diagram of the structure of an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram illustrating the detection principle of an embodiment of the present invention;

[0042] Figure 3 This is a planar sectional view of the contour detection device according to an embodiment of the present invention;

[0043] Figure 4 This is a three-dimensional structural diagram of the contour detection device according to an embodiment of the present invention. Figure 1 ;

[0044] Figure 5 This is a three-dimensional structural diagram of the contour detection device according to an embodiment of the present invention. Figure 2 ;

[0045] Figure 6 This is a three-dimensional structural diagram of the contour detection device at the roller according to an embodiment of the present invention;

[0046] Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point A in the diagram;

[0047] Figure 8 An exploded three-dimensional diagram of the camshaft fine-tuning structure at the top of the contour detection device;

[0048] The labels in the diagram represent the following: 1-skylight; 2-crossbeam; 3-contour detection device; 4-displacement sensor; 4a-probe end; 5-roller; 6-U-shaped roller seat; 7-linear bearing seat; 8-guide rod; 8a-radial through hole; 9-bridging component; 10-spring; 11-limiting ring; 12-camshaft; 12a-journal; 12b-stepped shaft; 12c-wrench hole; 13-flange nut; 14-bracket; 14a-extension arm; 15-laser rangefinder; 16-fixed side plate; 16a-protruding end; 17-limiting component; 17a-support part; 17b-angled part. Detailed Implementation

[0049] 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 some embodiments of the present invention, and not all embodiments. 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.

[0050] This embodiment provides an online inspection fixture for an automotive sunroof 1. This inspection fixture is positioned above the sunroof conveyor line. In one specific implementation, the sunroof conveyor line can employ a precision conveyor line, such as a precision double-speed chain or a flat-top chain, in the section where the inspection station is located to ensure that the sunroof 1 passes smoothly and at a uniform speed during the inspection process. The automotive sunroof 1 is fixed to a dedicated carrier during transport, and the carrier ensures the precise positioning of the sunroof 1 on the conveyor line.

[0051] See Figures 1 to 8 As shown, the testing fixture includes a crossbeam 2, which is fixedly installed directly above the skylight conveyor line. The length direction of the crossbeam 2 is perpendicular to the conveying direction of the skylight conveyor line.

[0052] Several contour detection devices 3 are installed on the crossbeam 2, and all contour detection devices 3 are evenly distributed along the length direction of the crossbeam 2.

[0053] In the basic embodiment, each contour detection device 3 includes at least a vertically positioned displacement sensor 4 and a roller 5. The displacement sensor 4 can be a high-precision sensor, such as an LVDT (Linear Variable Differential Transmitter). The probe end 4a of the displacement sensor 4 is positioned downwards. The roller 5 is axially connected to the probe end 4a of the displacement sensor 4, and the rolling axis of the roller 5 is perpendicular to the conveying direction of the skylight 1. The roller 5 can be made of a wear-resistant material that does not damage the glass surface, such as polyurethane.

[0054] All contour detection devices 3 together constitute a multi-point contact contour detection array. When the sunroof 1, fixed on the carrier, passes continuously under the detection fixture driven by the conveyor line, all the rollers 5 in the array roll in contact with the upper surface of the sunroof 1 throughout its passage.

[0055] Correspondingly, all displacement sensors 4 synchronously collect relative displacement data of several sampling points in the vertical direction along the width of the skylight 1. The collected relative displacement data continuously form multiple longitudinal contour data sequences in the length direction of the skylight 1 (i.e., the conveying direction), and these multiple longitudinal contour data sequences correspond to sampling trajectories that are parallel to each other in the width direction of the skylight 1.

[0056] All longitudinal contour data sequences are aggregated and analyzed by a separate data processing module, together forming the overall curvature contour data of Skylight 1.

[0057] In the above basic embodiment, the roller 5 is directly axled to the probe end 4a of the displacement sensor 4. During the conveying process of the sunroof 1, the frictional force generated by the contact between the roller 5 and the surface of the sunroof 1, as well as the lateral impact force that may be generated when the leading edge of the sunroof 1 contacts the roller 5, will be directly transmitted to the probe end 4a of the displacement sensor 4. This may affect the measurement stability and service life of the high-precision sensor.

[0058] To address this issue, in an improved embodiment, the connection structure of the contour detection device 3 is optimized. Specifically, a lifting mechanism is fixedly installed beside the displacement sensor 4. The specific form of the lifting mechanism is not limited; it can be a guide rod type or a slide rail type. The lifting movable end of the lifting mechanism is fixedly connected to the probe end 4a of the displacement sensor 4. The roller 5 is connected to the bottom of the lifting movable end of the lifting mechanism through a U-shaped roller seat 6. The open end of the U-shaped roller seat 6 faces downward, and the roller 5 is fixedly abutted inside the U-shaped roller seat 6.

[0059] With this structure, the friction or lateral force generated by the sunroof 1 on the roller 5 will be borne by the guide structure of the lifting mechanism (such as the guide rod 8 or the slide rail). The probe end 4a of the displacement sensor 4 will only follow the lifting moving end in a purely vertical motion, without being disturbed by the lateral force. This improves the stability of the detection and the durability of the device.

[0060] Based on the above embodiments, the lifting mechanism can be implemented in a specific way that achieves high rigidity and low friction. The lifting mechanism includes two linear bearing seats 7, which are longitudinally spaced and fixedly mounted on the crossbeam 2. A guide rod 8 is vertically mounted and passes through the two linear bearing seats 7.

[0061] The U-shaped roller seat 6 is fixedly mounted on the bottom of the guide rod 8. The lower end of the guide rod 8 is fixedly connected to the probe end 4a of the displacement sensor 4 via a bridging member 9. Through the precise cooperation of two linear bearing seats 7 and a guide rod 8, a high-rigidity linear guide unit is formed, ensuring that the roller 5 and the sensor probe end 4a can only move precisely in the vertical direction.

[0062] In the aforementioned guide rod 8 structure, the downward pressure of roller 5 mainly relies on its own gravity and the weak rebound force inherent in the probe end 4a of displacement sensor 4. When the curvature of skylight 1 changes rapidly, especially when the contour is concave downward, this downward pressure may be insufficient, causing roller 5 to momentarily separate from or jump between the surface of skylight 1, affecting the continuity and accuracy of the data. Furthermore, this structure lacks a convenient reference calibration mechanism to unify the zero position of all sensors in the array.

[0063] To address this issue, in a further embodiment, a spring 10 is fitted over the guide rod 8, positioned between the two linear bearing seats 7. The upper end of the spring 10 abuts against the bottom of the upper linear bearing seat 7. A lockable limiting ring 11 is fixedly fitted onto the guide rod 8, and the limiting ring 11 adheres to the top of the lower linear bearing seat 7 under the weight of the guide rod 8. The lower end of the spring 10 abuts against the top of the limiting ring 11.

[0064] The spring 10 provides a continuous and elastic downward pressure to the guide rod 8, ensuring that the roller 5 can closely fit the curved surface of the sunroof 1 in real time when the sunroof 1 passes through at high speed, and respond instantly to the rapid changes in curvature.

[0065] Meanwhile, in addition to serving as a force-applying component for the spring 10 on the guide rod 8, the limiting ring 11 also provides a calibration function: during calibration, the limiting ring 11 can be loosened, the guide rod 8 (or the probe end 4a of the displacement sensor 4) can be moved to a standard reference surface (such as a calibration plate) and brought into contact, and then the limiting ring 11 can be re-locked to set the uniform zero position of all detection devices.

[0066] Although calibration can be achieved by adjusting the limit ring 11, in actual operation, it is difficult to achieve high-precision fine-tuning by manually sliding the guide rod 8 and locking the limit ring 11, which may lead to poor zero-position consistency among the various sensors in the array.

[0067] To achieve more precise and convenient zeroing and fine-tuning, in a preferred embodiment, a camshaft 12 is connected to the upper end of the guide rod. A radial through hole 8a is formed at the upper end of the guide rod for the journal 12a of the camshaft 12 to pass through. External threads are formed on the outer wall of the journal 12a of the camshaft 12. After passing through the radial through hole 8a, a flange nut 13 is screwed onto the journal 12a of the camshaft 12. A stepped shaft 12b is formed on the journal 12a of the camshaft 12. The flange nut 13, in conjunction with the stepped shaft 12b, locks the camshaft 12 to the guide rod. The cam profile of the camshaft 12 faces downwards and fits against the top surface of the linear bearing seat 7 above. A wrench hole 12c (e.g., an internal hexagonal socket) is formed at the end of the camshaft 12 away from the flange nut 13.

[0068] During calibration, first loosen the limiting ring 11, then insert a tool (such as an Allen wrench) into the wrench hole 12c and rotate the camshaft 12. Since the cam profile surface abuts against the fixed linear bearing seat 7, rotating the camshaft 12 will cause its eccentric profile to force the guide rod (i.e., the probe end 4a of the displacement sensor 4) to make precise vertical fine adjustments. After reaching the target zero position, tighten the flange nut 13 to fix the angle of the camshaft 12, and finally tighten the limiting ring 11. This method provides precise and repeatable fine adjustment capability.

[0069] Furthermore, the measurement accuracy of this embodiment is highly dependent on the geometry of the roller 5. However, the roller 5 will inevitably wear down during continuous rolling contact with the glass of the sunroof 1, resulting in a reduction in its radius.

[0070] This wear will be introduced into the readings of displacement sensor 4 as a systematic error. Over time, it will cause the contour data to become distorted, affecting the accuracy of the detection results.

[0071] To eliminate measurement errors caused by wear on the roller 5, one embodiment adds a real-time monitoring device for the roller 5 status to the guide rod 8. A bracket 14 is fixedly sleeved on the guide rod 8, and an upwardly extending extension arm 14a is formed on the bracket 14. A laser rangefinder 15 is provided at the end of the extension arm 14a. The detection optical path of the laser rangefinder 15 is directly facing the outer contour surface of the roller 5.

[0072] Since the material of roller 5 (such as polyurethane) is not a highly reflective or highly transparent material, the laser rangefinder 15 can detect the distance between them very well. This is because the laser rangefinder 15 moves up and down with the guide rod 8, and it detects the relative distance between its installation position and the outer contour surface of roller 5.

[0073] When roller 5 wears, the relative distance will change, so the amount of wear of roller 5 can be calculated in real time. This wear data can be used to compensate the reading of displacement sensor 4 in real time, and can also be used to determine whether roller 5 has reached the replacement standard.

[0074] In the above-mentioned scheme of adding a laser rangefinder 15, the reading of the laser rangefinder 15 must be highly stable in order to accurately reflect the minute wear of the roller 5. However, the bracket 14 that it is fixed to is installed on the moving guide rod 8. If the bracket 14 is not fixed firmly, the vibration or loosening generated during the movement will cause the reference point of the laser rangefinder 15 to drift, making its reading invalid.

[0075] To ensure the installation stability of the laser rangefinder 15, one embodiment provides a highly stable bracket 14 fixing structure. One end of the bracket 14 is attached to the top of the bridging member 9, and the bridging member 9 is attached downward to the top of the U-shaped roller seat 6. Fixed side plates 16 are respectively provided on both sides of the U-shaped roller seat 6, and the fixed side plates 16 are fixedly connected to the U-shaped roller seat 6 and the bridging member 9. The upper edge of the fixed side plate 16 protrudes from the top surface of the bridging member 9. The two sides of the bracket 14 that are attached to the bridging member 9 are respectively attached to the protruding ends 16a of the fixed side plates 16 on both sides, thereby forming a circumferential limit for the bracket 14. A limiting member 17 that presses the bracket 14 downward is sleeved on the guide rod 8.

[0076] With this design, the bottom of the bracket 14 is pressed vertically by the bridging member 9 and the limiting member 17, and the two sides are limited by the protruding end 16a of the fixed side plate 16, thus being firmly locked in multiple degrees of freedom and preventing it from shaking during the movement of the guide rod 8.

[0077] Although the above structure fixes the base of the bracket 14, the laser rangefinder 15 is located at the end of the extension arm 14a, which is in a cantilever state. It may still vibrate under the high-frequency vibration of the guide rod 8, affecting the stability of the laser measuring point.

[0078] To further suppress vibration at the end of the extension arm 14a, a preferred embodiment strengthens the connection between the limiting member 17 and the extension arm 14a. The sidewall of the limiting member 17 has a support portion 17a extending in the direction of the extension arm 14a. The bottom end of the support portion 17a has an angled portion 17b that matches the inclined surface of the extension arm 14a. The extension arm 14a and the support portion 17a are fixedly connected by screws.

[0079] In this way, the extension arm 14a is not only fixed at the root, but its body is also connected to the support part 17a on the limiting member 17, which greatly improves the rigidity of the extension arm 14a and ensures the stability of the relative position of the laser rangefinder 15 during dynamic measurement.

[0080] In the above-mentioned embodiment of the lifting mechanism, it is also necessary to consider the protection of the displacement sensor 4. The probe end 4a of the displacement sensor 4 has a predetermined active detection stroke. In order to prevent the bridging member 9 from hitting the bottom of the crossbeam 2, the distance between the bridging member 9 and the bottom of the crossbeam 2 is greater than the active detection stroke of the probe end 4a of the displacement sensor 4 to avoid impact. This design ensures that the moving parts such as the bridging member 9 will not interfere with the fixed parts such as the crossbeam 2 throughout the entire effective measurement range of the sensor.

[0081] The present invention also provides a detection method for an online inspection fixture for an automotive sunroof 1 based on the above embodiments (e.g., the embodiment including a laser rangefinder 15). The method includes the following steps:

[0082] S1, Preparation and Calibration: Fix the sunroof 1 to a dedicated vehicle and preset the height of the sunroof 1 on the vehicle. This height setting should ensure that the leading edge of the sunroof 1 has a low-impact, progressive contact height relationship with the roller array 5. For example, the height of the leading edge of the sunroof 1 can be slightly higher than the lowest point of the roller array 5 in its free state, so that when the vehicle enters, the leading edge of the sunroof 1 will gently push up the rollers 5. Simultaneously, perform zero-position calibration and array consistency calibration on all displacement sensors 4 in the multi-point contact contour detection array. Array consistency calibration refers to placing all rollers 5 on the same high-precision planar reference (such as a calibration plate) and ensuring that the readings of all displacement sensors 4 are consistent on this reference plane or that their deviations are within allowable limits. This is typically achieved through adjustment (such as the cam fine-tuning mechanism in the aforementioned embodiment).

[0083] S2, Conveying and Contact: The carrier, together with the sunroof 1, is smoothly conveyed to the detection position through a precision conveying structure (such as a precision conveyor belt), and its roller array 5 rolls in contact with the upper surface of the sunroof 1 throughout the entire process. At the same time, the conveying process is continuous.

[0084] S3, Parallel Data Acquisition: During the process of passing through the detection position in window 1, the following sub-steps are executed simultaneously:

[0085] S3a, Main contour acquisition: The contour detection array synchronously acquires the original relative displacement data of several sampling points in the vertical direction of the width direction of the skylight 1.

[0086] S3b, Roller 5 wear monitoring: The laser rangefinder 15 installed on each contour detection device 3 continuously or periodically detects the outer contour surface of the corresponding roller 5 in real time to obtain the vertical wear of the roller 5.

[0087] S4, Data Processing and Compensation: The data processing module uses the raw relative displacement data collected in S3a and the vertical loss obtained in S3b to perform real-time dynamic compensation, resulting in corrected relative displacement data. Multiple corrected relative displacement data continuously form multiple longitudinal contour data sequences along the length of skylight 1;

[0088] S5, Contour Judgment: The data processing module compares the overall curvature contour data formed by the multiple longitudinal contour data sequences generated in S4 with the theoretical curvature contour data of the pre-stored sunroof 1 design model. If the deviation of the comparison exceeds the preset tolerance range, the contour of the car sunroof 1 is determined to be unqualified.

[0089] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of the embodiments of the present invention.

Claims

1. An online inspection fixture for automotive sunroofs, wherein the inspection fixture is positioned above the sunroof conveyor line, characterized in that, The testing fixtures include: The crossbeam (2) is fixedly installed directly above the skylight conveyor line, and the length direction of the crossbeam (2) is perpendicular to the conveying direction of the skylight conveyor line; Contour detection devices (3) are set on the crossbeam (2) and there are several of them. All contour detection devices (3) are evenly distributed along the length direction of the crossbeam (2). The contour detection device (3) includes at least: The displacement sensor (4) is set in a vertical position, with the probe end (4a) of the displacement sensor (4) facing downwards; The roller (5) is mounted on the probe end (4a) of the displacement sensor (4). The roller (5) rolls and contacts the upper surface of the skylight (1) throughout the passage of the skylight (1). The rolling axis of the roller (5) is perpendicular to the conveying direction of the skylight (1). All contour detection devices (3) together form a multi-point contact contour detection array, which is used to simultaneously collect the relative displacement data of several sampling points in the vertical direction of the width direction of the skylight (1) during the continuous conveying process of the skylight (1). The relative displacement data continuously form multiple longitudinal contour data sequences in the length direction of the skylight (1). The multiple longitudinal contour data sequences correspond to the sampling trajectories that are parallel to each other in the width direction of the skylight (1). The multiple longitudinal contour data sequences together constitute the overall curvature contour data of the skylight (1). A lifting mechanism is fixedly installed on the side of the displacement sensor (4), and the lifting movable end of the lifting mechanism is fixedly connected to the probe end (4a) of the displacement sensor (4). The roller (5) is connected to the bottom of the lifting movable end of the lifting mechanism through a U-shaped roller seat (6). The open end of the U-shaped roller seat (6) faces downward, and the roller (5) is fixedly connected to the U-shaped roller seat (6). The lifting mechanism includes: There are two linear bearing seats (7), which are fixedly installed on the crossbeam (2) at longitudinal intervals; The guide rod (8) is set in a vertical position and passes through two linear bearing seats (7); Among them, the U-shaped roller seat (6) is fixedly set at the bottom of the guide rod (8), and the lower end of the guide rod (8) is fixedly connected to the probe end (4a) of the displacement sensor (4) through a bridging member (9); A camshaft (12) is connected to the upper end of the guide rod. A radial through hole (8a) is formed at the upper end of the guide rod for the journal (12a) of the camshaft (12) to pass through. An external thread is formed on the outer wall of the journal (12a) of the camshaft (12). After the journal (12a) of the camshaft (12) passes through the radial through hole (8a), a flange nut (13) is screwed on. A stepped shaft (12b) is formed on the journal (12a) of the camshaft (12). The flange nut (13) cooperates with the stepped shaft (12b) to lock and fix the camshaft (12) and the guide rod. The cam profile of the camshaft (12) is attached to the top surface of the linear bearing seat (7) above. A wrench hole (12c) is formed at the end of the camshaft (12) away from the flange nut (13).

2. The online inspection fixture for automotive sunroofs according to claim 1, characterized in that, A spring (10) is fitted over the guide rod (8). The spring (10) is located between two linear bearing seats (7). The upper end of the spring (10) abuts against the bottom of the upper linear bearing seat (7). A lockable limiting ring (11) is fixedly fitted onto the guide rod (8). Under the gravity of the guide rod (8), the limiting ring (11) adheres to the top of the lower linear bearing seat (7). The lower end of the spring (10) abuts against the top of the limiting ring (11).

3. The online inspection fixture for automotive sunroofs according to claim 1, characterized in that, A bracket (14) is fixedly sleeved on the guide rod (8). An extension arm (14a) is formed on the bracket (14) and extends upward at an angle. A laser rangefinder (15) is provided at the end of the extension arm (14a). The detection optical path of the laser rangefinder (15) is directly facing the outer contour surface of the roller (5) to detect the distance between the outer surface of the roller (5) and the laser rangefinder (15) in real time.

4. The online inspection fixture for automotive sunroofs according to claim 3, characterized in that, One end of the bracket (14) is attached to the top of the bridging component (9), and the bridging component (9) is attached downward to the top of the U-shaped roller seat (6). Fixed side plates (16) are respectively provided on both sides of the U-shaped roller seat (6). The fixed side plates (16) are fixedly connected to the U-shaped roller seat (6) and the bridging component (9). The upper edge of the fixed side plate (16) protrudes from the top surface of the bridging component (9). The two sides of the bracket (14) that are attached to the bridging component (9) are respectively attached to the protruding ends (16a) of the fixed side plates (16) on both sides to form a circumferential limit on the bracket (14). A limiting component (17) that presses the bracket (14) downward is sleeved on the guide rod (8).

5. The online inspection fixture for automotive sunroofs according to claim 4, characterized in that, The sidewall of the limiting member (17) has a support portion (17a) extending in the direction of the extension arm (14a). The bottom end of the support portion (17a) has an angled portion (17b) that matches the inclined surface of the extension arm (14a). The extension arm (14a) and the support portion (17a) are fixedly connected by screws to ensure that the relative position of the laser rangefinder (15) at the end of the extension arm (14a) is stable.

6. The online inspection fixture for automotive sunroofs according to claim 1, characterized in that, The distance between the bridging component (9) and the bottom of the crossbeam (2) is greater than the active detection stroke of the probe end (4a) of the displacement sensor (4).

7. A testing method based on the online testing fixture for automotive sunroofs as described in claim 3, characterized in that, The method includes the following steps: S1, Preparation and Calibration: Fix the sunroof (1) on a special vehicle and preset the height of the sunroof (1) on the vehicle so that the leading edge of the sunroof (1) has a low impact, progressive contact roller (5) array height relationship; perform zero-position calibration and array consistency calibration on all displacement sensors (4) in the multi-point contact contour detection array. S2, Conveying and Contact: The skylight (1) is smoothly conveyed to the detection position through a precision conveying structure, and its roller (5) array makes full rolling contact with the upper surface of the skylight (1); S3, Parallel Data Acquisition: During the process of passing through the detection position in the skylight (1), the following sub-steps are executed synchronously: S3a, Main contour acquisition: The contour detection array synchronously acquires the original relative displacement data of several sampling points in the vertical direction of the skylight (1) width direction; S3b, Roller (5) wear monitoring: The laser rangefinder (15) continuously or periodically detects the outer contour surface of the roller (5) in real time to obtain the vertical wear of the roller (5); S4, Data Processing and Compensation: The original relative displacement data collected in S3a is dynamically compensated in real time using the vertical loss obtained in S3b to obtain corrected relative displacement data; the corrected relative displacement data continuously forms multiple longitudinal contour data sequences in the length direction of the skylight (1); S5, Contour Judgment: The data processing module compares the overall curvature contour data composed of multiple longitudinal contour data sequences with the theoretical curvature contour data of the sunroof (1) design model. If the deviation exceeds the preset tolerance range, the contour of the car sunroof (1) is deemed unqualified.

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