Automobile roof outer plate testing fixture

Abstract

The invention discloses an automobile roof outer plate detection tool, and belongs to the technical field of automobile part detection equipment, the automobile roof outer plate detection tool mainly comprises a base plate, two support plates are symmetrically fixed on the base plate, each support plate is provided with a self-adaptive clamp mechanism, the self-adaptive clamp mechanism comprises a gear rotating disc rotatably connected with the support plate, and the gear rotating disc is rotatably connected with the support plate. Two protection clamping plates are symmetrically distributed on the gear rotating disc, a plugging cover plate is fixed to one ends of the protection clamping plates, a plurality of telescopic supporting rods are distributed at one ends of the protection clamping plates at equal intervals, and the telescopic supporting rods are all connected with the plugging cover plate in a penetrating mode; by means of the self-adaptive clamping hoop mechanism, automobile roofs with different radian outlines can be conveniently detected, the detection tool does not need to be replaced, the detection input cost is reduced, the detection efficiency is improved, the front face and the back face of the automobile roof can be conveniently detected at a time, multiple times of clamping and angle adjusting are not needed, and the detection accuracy of the automobile roof can be improved.

Description

Technical Field

[0001] This application relates to the field of automotive parts testing equipment technology, specifically an inspection tool for automotive roof outer panels. Background Technology

[0002] In the automobile manufacturing process, the contour accuracy of the car roof panel directly affects the fit and appearance quality of the entire vehicle assembly. Therefore, it is necessary to use inspection fixtures to perform high-precision inspection. Currently, the support frames configured in existing car roof panel inspection fixtures are mostly rigid structures with a fixed curvature, which can only be adapted to the roof panels of a single model. When inspecting roofs with different curvatures, it is necessary to replace the support frames of the corresponding specifications or even the entire set of inspection fixtures. This not only increases the equipment investment cost, but also significantly reduces the model switching efficiency of the inspection production line.

[0003] Meanwhile, the support frame of the existing inspection fixture usually does not have the function of driving the ceiling to rotate in both directions. When used with inspection equipment such as blue light structured light scanning and multi-frequency stripe projection, it can only obtain the contour data of the ceiling from a single perspective. To complete the full inspection of the entire surface of the ceiling, it is necessary to manually clamp and adjust the placement angle of the ceiling multiple times. This process is not only time-consuming, but also prone to positioning errors due to repeated clamping, resulting in a decrease in the accuracy of the inspection data.

[0004] Therefore, it is necessary to provide a vehicle roof outer panel inspection tool to solve the above problems.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0006] Based on the aforementioned problems in the existing technology, the problem to be solved by this application is to provide an inspection fixture for the outer panel of an automobile roof. Through the setting of an adaptive clamping mechanism, it is convenient to inspect automobile roofs with different curvature profiles without the need to change the fixture, thereby reducing the inspection investment cost, improving the inspection efficiency, and facilitating the inspection of both the front and back sides of the automobile roof at one time without the need for multiple clamping and angle adjustments, which is conducive to improving the accuracy of automobile roof inspection.

[0007] The technical solution adopted by this application to solve its technical problem is as follows: a car roof outer panel inspection fixture, including a base plate, two support plates symmetrically fixed on the base plate, each support plate being provided with an adaptive clamping mechanism, the adaptive clamping mechanism including a gear turntable rotatably connected to the support plate, two protective clamps symmetrically distributed on the gear turntable, a sealing cover plate fixed to one end of each protective clamp, multiple telescopic support rods equidistantly distributed at one end of each protective clamp, all of the multiple telescopic support rods being connected through the sealing cover plate, an adjustment mechanism connected to one end of each protective clamp, a locking mechanism mounted on the end of the sealing cover facing the protective clamp, a dust cover fixed to the outside of each of the two support plates, the adjustment mechanism being located inside the protective cover, a moving mechanism mounted above the dust cover, a blue light scanner mounted on the moving mechanism, a first motor mounted on the support plate, an I-shaped gear rod connected to the output end of the first motor, the I-shaped gear rod being meshed with the gear turntable.

[0008] Furthermore, the adaptive clamp mechanism also includes two limiting partitions symmetrically and fixedly connected inside the protective clamp. Multiple guide slides fixedly connected to the protective clamp are equidistantly distributed between the two limiting partitions. The number of guide slides matches the number of telescopic support rods. The telescopic support rods are sleeved on the guide slides. An auxiliary spring is provided between the guide slides and the telescopic support rods. A pressure sensor and a rubber adsorption wheel are fixedly connected sequentially along the force direction at the top of the telescopic support rod. A rectangular limiting block is fixed at the end of the telescopic support rod away from the rubber adsorption wheel.

[0009] Furthermore, the adjustment mechanism includes two guide slots symmetrically opened on the gear turntable. Two sliders are symmetrically fixedly connected to one end of the protective clamp. The sliders are slidably connected to the guide slots. A bidirectional lead screw is rotatably connected to the guide slots and passes through the sliders. The bidirectional lead screw is threadedly connected to the sliders. A turbine is fixedly connected to the middle of the bidirectional lead screw. One end of the turbine is meshed with a worm gear shaft. The worm gear shaft is rotatably connected to the gear turntable through a support block. A second motor is provided at one end of the worm gear shaft. The output end of the second motor is fixedly connected to the worm gear shaft. The worm gear shaft is meshed with the turbine.

[0010] Furthermore, the locking mechanism includes a limiting plate fixedly connected to the protective clamping plate. A first locking plate is provided between the limiting plate and the sealing cover plate. A second locking plate is provided at the end of the limiting plate away from the first locking plate. The first and second locking plates are slidably connected to the limiting plate through a rectangular limiting cavity. A fifth motor is provided at the middle end of the second locking plate away from the limiting plate. The fifth motor is installed and fixed between the two limiting plates near the second locking plate by a fixing plate at the bottom. A camshaft is fixedly connected to the output end of the fifth motor. A pushing cavity is opened at the connection position of the camshaft with the first and second locking plates. The camshaft passes through the pushing cavity of the first and second locking plates. Locking holes are opened at equal intervals on both the first and second locking plates, with the number of locking holes equal to the number of telescopic support rods.

[0011] Furthermore, the moving mechanism includes two first moving guide rails respectively fixed above two support plates. A first lead screw is rotatably connected inside the first moving guide rail. A synchronous pulley is fixed to one end of the first lead screw. A synchronous belt is wound around the synchronous pulley. A third motor is assembled at one end of one of the two synchronous pulleys. The output end of the third motor is fixedly connected to the synchronous pulley. A first moving block is threadedly connected to the first lead screw. A second moving guide rail is fixedly connected to the first moving block. A second lead screw is rotatably connected inside the second moving guide rail. A fourth motor is assembled at one end of the second lead screw. A second moving block is threadedly connected to the second lead screw.

[0012] Furthermore, an electric push rod is fixedly installed at one end of the second movable block, and a blue light scanner is fixedly installed at the end of the electric push rod facing the base plate. The extension and retraction direction of the electric push rod is perpendicular to the plane of the base plate.

[0013] Furthermore, the I-shaped gear rod consists of two gears and a shaft. The I-shaped gear rod is horizontally mounted between two support plates, and its two ends are rotatably connected to the two support plates respectively. The first motor is mounted and fixed on a fixed plate near the base plate of the support plate, and the output end of the first motor is fixedly connected to one end of the I-shaped gear rod.

[0014] Furthermore, a V-shaped outward-expanding rubber ring is fixed to the outside of the rubber adsorption wheel, and the pressure sensor is electrically connected to the control unit of the locking mechanism. When all pressure sensors detect the preset pressure, the locking mechanism is triggered to operate.

[0015] The beneficial effects of this application are: it facilitates the inspection of car roofs with different curvature profiles, eliminates the need to change inspection tools, reduces inspection costs, improves inspection efficiency, and allows for the simultaneous inspection of both the front and back sides of the car roof without the need for multiple clamping and angle adjustments, which helps to improve the accuracy of car roof inspection.

[0016] 1. The automotive roof panel inspection fixture provided in this application, through an adaptive clamping mechanism, allows the automotive roof panel to be inspected to be stably placed on multiple rubber adsorption wheels evenly distributed on two protective clamps near the base plate on both sides. The arc-shaped contour of the roof panel will generate differentiated pressure on the rubber adsorption wheels at different positions on the protective clamps. The arc-shaped protrusions of the roof panel will apply downward pressure to the corresponding rubber adsorption wheels, causing the telescopic support rod below the rubber adsorption wheel at that position to retract inward along the guide slide rod. At the same time, the rectangular limiting block fixed at one end of the sliding telescopic support rod will compress the auxiliary spring sleeved on the outside of the guide slide rod. The telescopic support rod corresponding to the rubber adsorption wheel in contact with the arc-shaped concave area will experience less pressure, and the auxiliary spring will be less compressed. In a slightly contracted state, when the rubber adsorption wheel is in contact with the surface of the roof, its outer V-shaped rubber ring will deform due to compression and tightly adhere to the surface of the roof outer panel, thus positioning the roof outer panel. Pressure sensors installed between the rubber adsorption wheel and the telescopic support rod collect contact pressure data in real time and transmit the data to the control unit of the locking mechanism. When the pressure values ​​detected by all pressure sensors reach the preset threshold, the control unit determines that the roof has achieved adaptive positioning and then sends a locking trigger signal to the locking mechanism to lock and position the multiple telescopic support rods that are equidistantly distributed on the two protective clamps that have formed an adaptive contour. This facilitates the inspection of car roofs with different curvature contours, eliminates the need to change inspection tools, reduces inspection costs, and improves inspection efficiency.

[0017] 2. The automotive roof panel inspection fixture provided in this application, after the roof's upper surface is scanned and inspected, is driven by an adjustment mechanism to move two protective clamps near the base plate and two protective clamps away from the base plate closer to each other. When multiple rubber adsorption wheels evenly distributed on the two protective clamps away from the base plate are engaged with the roof according to the contour of the roof's upper surface, a corresponding locking mechanism locks and positions the telescopic support rod according to the height variation of the roof's contour. At this time, the V-shaped rubber rings fixed to the surfaces of the multiple rubber adsorption wheels on the two protective clamps near the base plate and the two protective clamps away from the base plate clamp the roof in the middle. Then, the first motor starts. The rotating I-shaped gear rod, which is fixed to the output shaft, rotates. The rotating I-shaped gear rod, through gear meshing, drives the two corresponding gear discs to rotate synchronously. The two rotating gear discs, through the protective clamps at one end, rotate the roof 180 degrees. The locking mechanism keeps it locked, ensuring that the position of the roof remains unchanged during the rotation. After the rotation is completed, the adjustment mechanism drives the two protective clamps near the base plate and the two protective clamps away from the base plate to move away from each other. This prevents the two protective clamps away from the base plate from affecting the scanning and detection effect. This allows for the simultaneous detection of both sides of the car roof without the need for multiple clamping and angle adjustments, which helps improve the accuracy of car roof detection.

[0018] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall three-dimensional structure; Figure 2 A three-dimensional structural diagram showing the connection between the base plate and the support plate; Figure 3 A schematic diagram of a three-dimensional structure connecting two gear-shaped turntables; Figure 4 A cross-sectional three-dimensional structural diagram of the connection between the gear turntable and the protective clamping plate; Figure 5 for Figure 4 Enlarged structural diagram of section A in the middle; Figure 6 A three-dimensional structural diagram showing the connection between the first and second locking plates; Figure 7 This is a three-dimensional structural diagram of the connection between the first lead screw and the second moving guide rail.

[0020] The following are the labeling elements in the figure: 1. Base plate; 11. Support plate; 2. Adaptive clamping mechanism; 21. I-shaped gear rod; 22. First motor; 23. Gear turntable; 24. Protective clamp plate; 25. Sealing cover plate; 26. Telescopic support rod; 27. Pressure sensor; 28. Rubber adsorption wheel; 29. ​​Limiting partition; 210. Guide slide rod; 211. Auxiliary spring; 212. Rectangular limiting block; 3. Adjustment mechanism; 31. Slider; 32. Two-way lead screw; 33. Turbine; 34. Second motor; 35. Worm gear shaft; 36. Guide... 4. Moving mechanism; 41. First moving guide rail; 42. Third motor; 43. Synchronous belt; 44. Synchronous pulley; 45. Second moving guide rail; 46. Electric push rod; 47. First lead screw; 48. First moving block; 49. Fourth motor; 410. Second moving block; 411. Second lead screw; 5. Locking mechanism; 51. First locking plate; 52. Limiting plate; 53. Second locking plate; 54. Camshaft; 55. Fifth motor; 56. Pushing cavity hole; 57. Locking hole; 6. Blue light scanner. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0023] like Figure 1-7As shown, this application provides a car roof outer panel inspection fixture, including a base plate 1. Two support plates 11 are symmetrically fixed on the base plate 1. Each support plate 11 is equipped with an adaptive clamping mechanism 2. The adaptive clamping mechanism 2 includes a gear turntable 23 rotatably connected to the support plate 11. Two protective clamping plates 24 are symmetrically distributed on the gear turntable 23. A sealing cover plate 25 is fixed to one end of each protective clamping plate 24. Multiple adaptively retractable telescopic support rods 26 are equidistantly distributed at one end of each protective clamping plate 24. All telescopic support rods 26 are connected through the sealing cover plate 25. An adjustment mechanism 3 for adjusting the distance between the two clamping plates is connected to one end of each protective clamping plate 24. The end of the cover plate 25 facing the protective clamp plate 24 is equipped with a locking mechanism 5 for locking the telescopic support rod 26 in its telescopic state. A dust cover is fixed to the outside of each of the two support plates 11. An adjustment mechanism 3 is located inside the protective cover. A moving mechanism 4 is mounted above the dust cover, and an adjustable-height blue light scanner 6 is installed on the moving mechanism 4. A first motor 22 is mounted on the support plate 11. The output end of the first motor 22 is connected to an I-shaped gear rod 21. The I-shaped gear rod 21 meshes with the gear turntable 23 to drive its rotation, realizing the flip detection of the car roof outer panel. The adaptive clamp mechanism 2 also includes two limiting spacers symmetrically fixedly connected inside the protective clamp plate 24. Plate 29, with multiple guide slide rods 210 equidistantly distributed between the two limiting partitions 29 and fixedly connected to the protective clamping plate 24. The number of guide slide rods 210 matches the number of telescopic support rods 26. The telescopic support rods 26 are sleeved on the guide slide rods 210. An auxiliary spring 211 is provided between the guide slide rods 210 and the telescopic support rods 26. A pressure sensor 27 and a rubber adsorption wheel 28 are fixedly connected sequentially at the top of the telescopic support rod 26 along the direction of force. A rectangular limiting block 212 is fixed at the end of the telescopic support rod 26 away from the rubber adsorption wheel 28. The pressure sensor 27 is used to detect the contact state between the rubber adsorption wheel 28 and the outer panel of the ceiling. I-shaped gear rod 21. It consists of two gears and a shaft. The I-shaped gear shaft 21 is horizontally mounted between two support plates 11, and its two ends are rotatably connected to the two support plates 11 respectively. The first motor 22 is mounted and fixed on a fixed plate near the base plate 1 of the support plate 11. The output end of the first motor 22 is fixedly connected to one end of the I-shaped gear shaft 21. The I-shaped gear shaft 21 drives the two gear turntables 23 to rotate synchronously through gear meshing. A V-shaped outward-expanding rubber ring is fixed on the outside of the rubber adsorption wheel 28. The pressure sensor 27 is electrically connected to the control unit of the locking mechanism 5. When all pressure sensors 27 detect the preset pressure, the locking mechanism 5 is triggered to operate.

[0024] In this embodiment, when the outer roof panel of the car to be tested is placed stably on multiple rubber adsorption wheels 28 evenly distributed on two protective clamps 24 near the base plate 1 on both sides, the arc-shaped contour of the outer roof panel will generate differentiated pressure on the rubber adsorption wheels 28 at different positions on the protective clamps 24. The arc-shaped protrusion area of ​​the outer roof panel will apply downward pressure to the corresponding rubber adsorption wheel 28, causing the telescopic support rod 26 provided below the rubber adsorption wheel 28 at that position to retract into the protective clamp 24 along the guide slide rod 210. At the same time, the rectangular limiting block 212 fixed at one end of the sliding telescopic support rod 26 will compress the auxiliary spring 211 sleeved on the outside of the guide slide rod 210, and the telescopic support rod 28 corresponding to the arc-shaped concave area will be compressed. The support rod 26 experiences relatively low pressure, and the auxiliary spring 211 is in a slightly contracted state. When the rubber adsorption wheel 28 is in contact with the ceiling surface, its outer V-shaped rubber ring deforms due to compression, tightly adhering to the surface of the outer ceiling panel and positioning the outer ceiling panel. The pressure sensor 27 installed between the rubber adsorption wheel 28 and the telescopic support rod 26 collects contact pressure data in real time and transmits the data to the control unit of the locking mechanism 5. When the pressure values ​​detected by all pressure sensors 27 reach the preset threshold, the control unit determines that the ceiling has achieved adaptive positioning and then sends a locking trigger signal to the locking mechanism 5 to lock the positions of the multiple telescopic support rods 26 that are equidistantly distributed on the two protective clamps 24 that have formed adaptive contours. The device is positioned, and then the moving mechanism 4 drives the blue light scanner 6 to move and scan the ceiling surface. After the ceiling surface is scanned, the adjusting mechanism 3 moves the two protective clamps 24 near the base plate 1 and the two protective clamps 24 away from the base plate 1 closer together. When the multiple rubber adsorption wheels 28 evenly distributed on the two protective clamps 24 away from the base plate 1 are engaged with the ceiling surface according to the contour, the corresponding locking mechanism 5 locks and positions the telescopic support rod 26 according to the height and width changes of the ceiling surface. At this time, the multiple rubber adsorption wheels 28 on the two protective clamps 24 near the base plate 1 and the two protective clamps 24 away from the base plate 1 are fixed to the surface. The V-shaped rubber ring clamps the central canopy. At this time, the first motor 22 starts and drives the I-shaped gear rod 21 fixed on the output shaft to rotate. The rotating I-shaped gear rod 21 drives the corresponding two gear turntables 23 to rotate synchronously through gear meshing. The two rotating gear turntables 23 will rotate the clamped canopy 180° through the protective clamping plate 24 at one end. The locking mechanism 5 keeps it locked to ensure that the position of the canopy remains unchanged during the rotation. After the rotation is completed, the adjusting mechanism 3 drives the two protective clamping plates 24 close to the base plate 1 and the two protective clamping plates 24 away from the base plate 1 to move away from each other to prevent the two protective clamping plates 24 away from the base plate 1 from affecting the scanning and detection effect.

[0025] It should be noted that when the curvature of the ceiling is extremely large, causing the spring to be over-compressed, the rectangular limit block 212 will abut against the limit partition 29, limiting the maximum amount of contraction of the telescopic support rod 26 and preventing the spring from failing due to excessive deformation.

[0026] like Figure 4 , Figure 5 and Figure 6 As shown, the locking mechanism 5 includes a limiting plate 52 fixedly connected to the protective clamping plate 24, a first locking plate 51 between the limiting plate 52 and the sealing cover plate 25, and a second locking plate 53 at the end of the limiting plate 52 away from the first locking plate 51. The first locking plate 51 and the second locking plate 53 are slidably connected to the limiting plate 52 through a rectangular limiting cavity. A fifth motor 55 is provided at the middle end of the second locking plate 53 away from the limiting plate 52. The fifth motor 55 is installed and fixed between the two limiting partitions 29 near the second locking plate 53 by a fixing plate provided at the bottom. A camshaft 54 ​​is fixedly connected to the output end of the five motors 55. A pushing cavity 56 is provided at the connection point between the camshaft 54 ​​and the first locking plate 51 and the second locking plate 53. The camshaft 54 ​​passes through the pushing cavity 56 of the first locking plate 51 and the second locking plate 53. Both the first locking plate 51 and the second locking plate 53 have locking holes 57 at equal intervals, equal in number to the telescopic support rod 26. When the camshaft 54 ​​rotates, it pushes the first locking plate 51 and the second locking plate 53, causing them to slide relative to each other. This allows the locking holes 57 of the two locking plates to engage with the telescopic support rod 26 in an alternating manner. In this embodiment, after the locking mechanism 5 receives the trigger signal from the control unit, the fifth motor 55 immediately starts. The output shaft of the fifth motor 55 drives the camshaft 54 ​​to rotate at a constant speed. When the eccentric protrusion of the camshaft 54 ​​rotates to contact the inner wall of the corresponding two pushing chambers 56, it will apply opposite pushing forces to the first locking plate 51 and the second locking plate 53 respectively. Under the action of the pushing force, the first locking plate 51 and the second locking plate 53 will slide horizontally relative to each other along the rectangular limiting cavity groove provided in the middle of the limiting plate 52. This causes the locking holes 57 on the first locking plate 51 and the second locking plate 53 to interlock and engage with the telescopic support rod 26, forming a ring-shaped clamp. The interlocking of the locking holes 57 causes the hole walls to exert radial pressure on the telescopic support rod 26, firmly fixing it in the current telescopic position. At this time, the fifth motor 55 stops rotating and maintains self-locking to ensure the stability of the clamp, providing rigid support for subsequent roof flipping and scanning, and preventing the telescopic support rod 26 from shifting due to vibration.

[0027] It should be noted that the camshaft 54 ​​adopts an eccentric structure design, and its axis is eccentric to the axis of the pushing cavity hole 56. In the initial state, the locking holes 57 of the first locking plate 51 and the second locking plate 53 are completely aligned, and the telescopic support rod 26 can pass through freely. When the camshaft 54 ​​rotates to the limit position, the relative displacement of the first locking plate 51 and the second locking plate 53 reaches the maximum value.

[0028] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the adjustment mechanism 3 includes two guide slots 36 symmetrically opened on the gear turntable 23. Two sliders 31 are symmetrically fixedly connected to one end of the protective clamping plate 24. The sliders 31 are slidably connected to the guide slots 36. A bidirectional lead screw 32 that is rotatably connected to the sliders 31 is rotatably connected in the guide slots 36. The bidirectional lead screw 32 is threadedly connected to the sliders 31. A worm gear 33 is fixedly connected to the middle of the bidirectional lead screw 32. One end of the worm gear 33 is meshed with a worm gear shaft 35. The worm gear shaft 35 is rotatably connected to the gear turntable 23 through a support block. A second motor 34 is provided at one end of the worm gear shaft 35. The output end of the second motor 34 is fixedly connected to the worm gear shaft 35. The worm gear shaft 35 is meshed with the worm gear 33. The worm gear shaft 35 drives the bidirectional lead screw 32 to rotate through the worm gear 33.

[0029] In this embodiment, when flipping and clamping the outer roof panel of different car models, the control system sends speed and direction signals to the second motor 34 according to the width parameter of the roof to be detected. The output shaft of the second motor 34 drives the worm gear shaft 35 to rotate. The worm gear shaft 35 drives the two meshing turbines 33 to rotate. The rotating turbines 33 drive the corresponding fixedly connected bidirectional lead screw 32 in the middle to rotate clockwise. The rotating bidirectional lead screw 32 drives the two threaded sliders 31 on it to move along the guide groove 3 on the gear turntable 23. The screw 6 moves closer to the middle of the bidirectional lead screw 32, thereby driving the two protective clamps 24, which are fixed at one end of the two sets of sliders 31, to move closer to each other, reducing the distance between the two protective clamps 24 so that the two protective clamps 24 clamp and position the canopy. When the second motor 34 drives the bidirectional lead screw 32 to rotate counterclockwise through the worm gear shaft 35 fixed at the output end and the worm gear 33 meshing with the worm gear shaft 35, it will drive the corresponding two sets of sliders 31 to move away from each other along the corresponding guide cavity groove 36, thereby driving the corresponding two protective clamps 24 to move away from each other and increase the distance.

[0030] It should be noted that the transmission structure of the worm gear has the characteristics of speed reduction and torque amplification and self-locking. The speed of the worm is reduced by the worm gear and then transmitted to the double-acting screw 32. At the same time, the torque is amplified to ensure that the double-acting screw 32 can drive the protective clamp 24 to move smoothly. Moreover, the worm gear cannot drive the worm to reverse, which can prevent the distance after adjustment from changing due to external force. The rod body of the double-acting screw 32 adopts a design with reverse threads at both ends. The thread on the left side is left-handed and the thread on the right side is right-handed. They are threaded to the sliders 31 at the ends of the two protective clamps 24 respectively. The worm gear shaft 35 consists of two worms and one shaft. The two worms are symmetrically distributed on both sides of the shaft. There are two sliders 31 in each of the two sets of sliders 31.

[0031] like Figure 1 and Figure 7 As shown, the moving mechanism 4 includes two first moving guide rails 41 respectively fixed above two support plates 11. A first lead screw 47 is rotatably connected inside the first moving guide rail 41. A synchronous pulley 44 is fixed to one end of the first lead screw 47. A synchronous belt 43 is wound around the synchronous pulley 44. A third motor 42 is assembled to one end of one of the two synchronous pulleys 44. The output end of the third motor 42 is fixedly connected to the synchronous pulley 44. A first moving block 48 is threadedly connected to the first lead screw 47. A second moving guide rail is fixedly connected to the first moving block 48. A second lead screw 411 is rotatably connected inside the second moving guide rail 45. A fourth motor 49 is mounted on one end of the second lead screw 411. A second moving block 410 is threaded onto the second lead screw 411. An electric push rod 46 is fixedly installed on one end of the second moving block 410. A blue light scanner 6 is fixedly installed on the end of the electric push rod 46 facing the base plate 1. The extension and retraction direction of the electric push rod 46 is perpendicular to the plane of the base plate 1. It can drive the blue light scanner 6 to rise and fall to adjust the scanning height and prevent the protective clamp 24 from obstructing the scanning field of view.

[0032] In this embodiment, after the ceiling is positioned and secured, the third motor 42 is started. The output shaft of the third motor 42 drives the corresponding fixed synchronous pulley 44 to rotate. The rotating synchronous pulley 44 drives another synchronous pulley 44 to rotate through the transmission of the synchronous belt 43. The two rotating synchronous pulleys 44 drive the first lead screw 47, which is fixed at the middle of one end of the two synchronous pulleys 44, to rotate synchronously. The rotating first lead screw 47 drives the first moving block 48 to move smoothly along the length of the ceiling under the guidance of the first moving guide rail 41, thereby driving the second moving guide rail 45, which is fixed at one end of the first moving block 48, to move smoothly along the length of the ceiling. At the same time, the fourth motor 49 is started. The fourth motor 49 drives the second lead screw 411, which is fixed at the output end, to rotate. The rotating second lead screw 411 drives the second moving block 410 to move along the second moving guide rail 411. 5. Moving in a straight line, the second moving block 410 moves along the width of the ceiling by means of an electric push rod 46 fixed at one end, which drives the blue light scanner 6 fixed below the electric push rod 46 to move along the width of the ceiling. Through coordinated control in the length and width directions, the blue light scanner 6 can cover the entire upper surface area of ​​the ceiling. During the scanning process, the electric push rod 46 installed on the second moving block 410 receives the distance feedback signal from the blue light scanner 6 in real time. The distance sensor built into the blue light scanner 6 detects the distance between it and the ceiling surface. When the distance is greater than or less than the optimal scanning distance, the electric push rod 46 immediately extends or retracts to adjust. If the distance is too large, the push rod extends to drive the scanner down. If the distance is too small or there is a risk of obstruction by the protective clamp 24, the push rod retracts to drive the scanner up, ensuring that the height of the scanner is always lower than the top surface of the protective clamp 24 to avoid obstructing the scanning field of view.

[0033] It should be noted that the detection principle of the Blue Light Scanner 6 involves its built-in DLP projection module projecting three to five sets of blue light sinusoidal stripes of different frequencies onto the ceiling surface. These stripes sequentially cover the ceiling width. Two symmetrically arranged blue light cameras within the scanner simultaneously acquire images of the stripe distortion. Fourier transform is used to extract the stripe phase information of each pixel. Combined with the phase height calibration data before detection, the absolute phase values ​​are converted into three-dimensional coordinates, quickly generating a global point cloud model of the ceiling. When the Blue Light Scanner 6 moves to the corners of the mounting holes and the flanges of the ceiling, the projection module switches to a random dot matrix plus coded marker point projection mode, projecting blue light dots onto local detail areas. The binocular cameras capture the imaging positions of these dots on the ceiling surface. Based on the trigonometric geometric relationships of the camera optical axis angle, baseline distance, and imaging offset, the three-dimensional coordinates of each pixel are calculated. By matching the marker points with the global point cloud, the local detail point cloud is seamlessly stitched into the global model. Working principle: When the outer roof panel of the car to be tested is placed stably on multiple rubber adsorption wheels 28 evenly distributed on two protective clamps 24 near the base plate 1 on both sides, the arc-shaped contour of the outer roof panel will generate differentiated pressure on the rubber adsorption wheels 28 at different positions on the protective clamps 24. The arc-shaped protrusions of the outer roof panel will apply downward pressure to the corresponding rubber adsorption wheels 28, causing the telescopic support rod 26 located below the rubber adsorption wheel 28 at that position to retract inward along the guide slide rod 210 into the protective clamps 24. At the same time, the telescopic support rod 26 slides down... The fixed rectangular limiting block 212 compresses the auxiliary spring 211 sleeved on the outside of the guide slide rod 210, while the pressure on the telescopic support rod 26 corresponding to the rubber adsorption wheel 28 in contact with the arc-shaped concave area is relatively small, and the auxiliary spring 211 is in a slightly contracted state. When the rubber adsorption wheel 28 is in contact with the ceiling surface, its outer V-shaped rubber ring will deform due to compression and tightly adhere to the surface of the ceiling outer panel, positioning the ceiling outer panel. The pressure sensor 27 installed between the rubber adsorption wheel 28 and the telescopic support rod 26 collects data in real time. The pressure data is transmitted to the control unit of the locking mechanism 5. When the pressure values ​​detected by all pressure sensors 27 reach the preset threshold, the control unit determines that the canopy has achieved adaptive positioning and then sends a locking trigger signal to the locking mechanism 5. After receiving the trigger signal from the control unit, the fifth motor 55 starts immediately. The output shaft of the fifth motor 55 drives the camshaft 54 ​​to rotate at a constant speed. When the eccentric protrusion of the camshaft 54 ​​rotates to contact the inner wall of the corresponding two pushing chamber holes 56, it will affect the first locking plate 51. The first locking plate 51 and the second locking plate 53 are respectively subjected to opposite pushing forces. Under the action of the pushing force, the first locking plate 51 and the second locking plate 53 will slide horizontally relative to each other along the rectangular limiting cavity groove provided in the middle of the limiting plate 52. This will cause the locking holes 57 opened on the first locking plate 51 and the second locking plate 53 to be staggered and engaged with the telescopic support rod 26 and tightly fit with the rod body of the telescopic support rod 26 to form a ring-shaped clamp. The staggered amount of the locking holes 57 causes the hole walls to generate radial pressure on the telescopic support rod 26, which firmly fixes it in the current telescopic position. The third motor 42 is started. The output shaft of the third motor 42 drives the corresponding fixed synchronous pulley 44 to rotate. The rotating synchronous pulley 44 drives another synchronous pulley 44 to rotate through the transmission of the synchronous belt 43. The two rotating synchronous pulleys 44 drive the first lead screw 47, which is fixed at the middle of one end of each synchronous pulley 44, to rotate synchronously. The rotating first lead screw 47 drives the first moving block 48 to move smoothly along the length of the ceiling under the guidance of the first moving guide rail 41. This drives the second moving guide rail 45, which is fixed at one end of the first moving block 48, to move smoothly along the length of the ceiling. At the same time, the fourth motor 49 is started. The fourth motor 49 drives the second lead screw 411, which is fixed at the output end, to rotate. The rotating second lead screw 411 drives the first moving block 48 to rotate along the length of the ceiling. The second moving block 410 moves linearly along the second moving guide rail 45. During its movement, the second moving block 410 drives the blue light scanner 6 fixed below the electric push rod 46, which is fixed at one end, to move along the width direction of the ceiling. Through coordinated control in the length and width directions, the blue light scanner 6 can cover the entire upper surface area of ​​the ceiling to scan and detect the upper surface. After the upper surface scan and detection is completed, the output shaft of the second motor 34 drives the worm gear shaft 35 to rotate. The worm gear shaft 35 drives the two meshing worms 33 to rotate. The rotating worms 33 drive the corresponding fixed bidirectional lead screw 32 in the middle to rotate clockwise. The rotating bidirectional lead screw 32 drives the two threaded connections on it to rotate clockwise. The slider 31 moves closer to the center of the bidirectional lead screw 32 along the guide cavity 36 on the gear turntable 23, thereby driving the two protective clamps 24, which are fixed at one end of the two sets of sliders 31, to move closer to each other. When the multiple rubber adsorption wheels 28, which are equidistantly distributed on the two protective clamps 24 away from the base plate 1, are engaged with the ceiling according to the contour of the ceiling surface, the corresponding locking mechanism 5 locks and positions the telescopic support rod 26 according to the height and expansion changes of the ceiling contour. At this time, the V-shaped rubber rings fixed on the surfaces of the multiple rubber adsorption wheels 28 on the two protective clamps 24 near the base plate 1 and the two protective clamps 24 away from the base plate 1 will clamp the ceiling in the middle. At this time, the first motor 22 starts. The second motor 34 drives the I-shaped gear rod 21, which is fixed to the output shaft, to rotate. The rotating I-shaped gear rod 21, through gear meshing, drives the two corresponding gear discs 23 to rotate synchronously. The two rotating gear discs 23, through the protective clamps 24 at one end, rotate the roof 180°. Upon completion of the rotation, the second motor 34, through the worm gear shaft 35 fixed to the output end and the worm gear 33 meshing with the worm gear shaft 35, drives the bidirectional lead screw 32 to rotate counterclockwise. This causes the two corresponding sliders 31 to move away from each other along the corresponding guide grooves 36, thereby causing the two corresponding protective clamps 24 to move away from each other. The upper protective clamp 24 moves away from the car roof, while the lower protective clamp 24 provides support and positioning for the car roof.The moving mechanism 4 will drive the blue light scanner 6 to continue moving along the length and width of the ceiling, covering the entire lower surface of the ceiling and scanning it for detection.

[0034] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A vehicle roof panel inspection fixture, comprising a base plate (1), characterized in that: Two support plates (11) are symmetrically fixed on the base plate (1). Each support plate (11) is provided with an adaptive clamping mechanism (2). The adaptive clamping mechanism (2) includes a gear turntable (23) rotatably connected to the support plate (11). Two protective clamps (24) are symmetrically distributed on the gear turntable (23). A sealing cover plate (25) is fixed to one end of the protective clamp (24). Multiple telescopic support rods (26) are equidistantly distributed at one end of the protective clamp (24). The multiple telescopic support rods (26) are all connected through the sealing cover plate (25). The protective clamps (24) are symmetrically distributed on the base plate (11). 4) One end is connected to an adjustment mechanism (3), and the end of the sealing cover (25) facing the protective clamp (24) is equipped with a locking mechanism (5). A dust cover is fixed outside each of the two support plates (11). The adjustment mechanism (3) is located inside the protective cover. A moving mechanism (4) is mounted above the dust cover. A blue light scanner (6) is installed on the moving mechanism (4). A first motor (22) is mounted on the support plate (11). The output end of the first motor (22) is connected to an I-shaped gear rod (21). The I-shaped gear rod (21) meshes with the gear turntable (23).

2. The automotive roof outer panel inspection fixture according to claim 1, characterized in that: The adaptive clamp mechanism (2) also includes two limiting partitions (29) symmetrically fixedly connected inside the protective clamp (24). Multiple guide slides (210) fixedly connected to the protective clamp (24) are distributed equidistantly between the two limiting partitions (29). The number of guide slides (210) matches the number of telescopic support rods (26). The telescopic support rods (26) are sleeved on the guide slides (210). An auxiliary spring (211) is provided between the guide slides (210) and the telescopic support rods (26). A pressure sensor (27) and a rubber adsorption wheel (28) are fixedly connected in sequence along the force direction at the top of the telescopic support rods (26). A rectangular limiting block (212) is fixed at the end of the telescopic support rods (26) away from the rubber adsorption wheel (28).

3. The automotive roof outer panel inspection fixture according to claim 1, characterized in that: The adjustment mechanism (3) includes two guide slots (36) symmetrically opened on the gear turntable (23). Two sliders (31) are symmetrically fixedly connected to one end of the protective clamp (24). The sliders (31) are slidably connected to the guide slots (36). A bidirectional lead screw (32) is rotatably connected to the guide slots (36) and is connected through the sliders (31). The bidirectional lead screw (32) is threadedly connected to the sliders (31). A turbine (33) is fixedly connected to the middle of the bidirectional lead screw (32). One end of the turbine (33) is meshed with a worm gear shaft (35). The worm gear shaft (35) is rotatably connected to the gear turntable (23) through a support block. A second motor (34) is provided at one end of the worm gear shaft (35). The output end of the second motor (34) is fixedly connected to the worm gear shaft (35). The worm gear shaft (35) is meshed with the turbine (33).

4. The automotive roof outer panel inspection fixture according to claim 1, characterized in that: The locking mechanism (5) includes a limiting plate (52) fixedly connected to the protective clamp (24). A first locking plate (51) is provided between the limiting plate (52) and the sealing cover plate (25). A second locking plate (53) is provided at one end of the limiting plate (52) away from the first locking plate (51). The first locking plate (51) and the second locking plate (53) are slidably connected to the limiting plate (52) through a rectangular limiting cavity. A fifth motor (55) is provided at one end of the second locking plate (53) away from the limiting plate (52). The fifth motor (55) is connected to a fixing plate at the bottom. The fifth motor (55) is fixedly connected to a camshaft (54) at the output end of the fifth motor (55) between the two limiting partitions (29) and near the second locking plate (53). A pushing cavity hole (56) is opened at the connection position of the camshaft (54) with the first locking plate (51) and the second locking plate (53). The camshaft (54) passes through the pushing cavity hole (56) of the first locking plate (51) and the second locking plate (53). The first locking plate (51) and the second locking plate (53) are provided with locking holes (57) at equal intervals, which are equal in number to the telescopic support rod (26).

5. The automotive roof outer panel inspection fixture according to claim 1, characterized in that: The moving mechanism (4) includes two first moving guide rails (41) fixed above two support plates (11) respectively. A first lead screw (47) is rotatably connected inside the first moving guide rail (41). A synchronous pulley (44) is fixed at one end of the first lead screw (47). A synchronous belt (43) is wound around the synchronous pulley (44). A third motor (42) is assembled at one end of one of the two synchronous pulleys (44). The output end of the third motor (42) is fixedly connected to the synchronous pulley (44). A first moving block (48) is threadedly connected to the first lead screw (47). A second moving guide rail (45) is fixedly connected to the first moving block (48). A second lead screw (411) is rotatably connected inside the second moving guide rail (45). A fourth motor (49) is assembled at one end of the second lead screw (411). A second moving block (410) is threadedly connected to the second lead screw (411).

6. The automotive roof outer panel inspection fixture according to claim 5, characterized in that: An electric push rod (46) is fixedly installed at one end of the second moving block (410). A blue light scanner (6) is fixedly installed at the end of the electric push rod (46) facing the base plate (1). The extension and retraction direction of the electric push rod (46) is perpendicular to the plane of the base plate (1).

7. The automotive roof outer panel inspection fixture according to claim 1, characterized in that: The I-shaped gear rod (21) is composed of two gears and a shaft. The I-shaped gear rod (21) is horizontally mounted between two support plates (11). The two ends of its shaft are rotatably connected to the two support plates (11) respectively. The first motor (22) is mounted and fixed on a fixed plate near the base plate (1) of the support plate 11. The output end of the first motor (22) is fixedly connected to one end of the I-shaped gear rod (21).

8. The automotive roof outer panel inspection fixture according to claim 2, characterized in that: A V-shaped outward-expanding rubber ring is fixed on the outside of the rubber adsorption wheel (28), and the pressure sensor (27) is electrically connected to the control unit of the locking mechanism (5).

Images