A rapid straightness detection device for automobile parts and pipes based on laser measurement technology

Abstract

The present invention relates to the field of axis straightness detection, and discloses a rapid straightness detection device for automobile parts and pipes based on laser measurement technology, comprising: a detection bracket, on which two conveying rings are provided; a plurality of conveying shafts provided in the two conveying rings, which can slide in the conveying rings and rotate about their own axes; in view of the problem in the prior art that it is difficult to cover the entire axis of a relatively long workpiece due to the travel limitation of the guide rail or the threaded transmission part, the present application adopts a method of segmented movement of the detection ring in conjunction with the step-by-step feeding of the pipe fitting, thereby converting the detection range originally dependent on the structural size into a controllable rhythmic cyclic detection process. The detection ring triggers the action of the conveying component in a linkage manner during the return process, so that the pipe fitting is automatically advanced after each section of the detection is completed, so that the entire pipe fitting can be covered in sections within multiple detection cycles, thereby breaking through the physical limitation of the structural travel and adapting to the full-length detection requirements of workpieces with a large range of length variations.

Description

Technical Field

[0001] The present invention relates to the technical field of axis straightness detection, and in particular to a device for quickly detecting the straightness of automobile parts and pipes based on laser measurement technology. Background Art

[0002] With the rapid development of high-end manufacturing and the automotive industry, various tubular and shaft components are widely used in engine systems, transmission systems, and structural frameworks. The geometric precision parameters of these parts, such as straightness and concentricity, are directly related to the assembly accuracy, operating stability, and fatigue life of the entire vehicle. In particular, for typical components such as main shafts, drive shafts, fuel pipes, air conditioning pipes, and brake pipes, if the axis geometric deviation exceeds the design tolerance, it will not only cause mechanical vibration, leakage, and poor meshing, but also affect the performance and safety of the entire vehicle.

[0003] Prior art, such as the comparative document CN119245554B, proposes a compact, highly interconnected spindle concentricity laser detection device. This device utilizes a self-adjusting clamping mechanism coupled with a laser rangefinder to rotate the workpiece. This mechanism, while clamped, automatically rotates the workpiece through a paddle-friction wheel-one-way bearing transmission mechanism. Combined with a movable laser rangefinder, the device scans the spindle's outer diameter for concentricity at multiple angles, eliminating the need for manual rotation. This solution significantly improves the automation and efficiency of detection.

[0004] However, while this technology already possesses basic automated rotation and lateral scanning capabilities, its overall structure still has limited applicability. The measured spindle length is restricted by the structural travel, making it difficult to adapt to the inspection needs of workpieces with large length variations. For example, when inspecting long drive shafts, pipes, or large structural shafts, the laser rangefinder's range of motion is limited by the travel of the lateral guide rails or threaded rods, making it impossible to cover the entire axis of the workpiece. This results in some areas being unable to be effectively measured, affecting the integrity and accuracy of the overall inspection. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a device for quickly detecting the straightness of automobile parts and pipes based on laser measurement technology, aiming to alleviate the above problems at least to a certain extent.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] The rapid straightness detection device for automobile parts and pipes based on laser measurement technology includes:

[0008] A detection bracket, wherein the detection bracket is provided with two conveying rings;

[0009] A plurality of conveying shafts are provided in the two conveying rings, wherein the conveying shafts are capable of sliding in the conveying rings and rotating about their own axes;

[0010] A detection ring is provided in the detection bracket, wherein a plurality of laser profile sensors are provided in the detection ring;

[0011] A conveying component provided between the detection bracket and the conveying shaft, for synchronously rotating the plurality of conveying shafts;

[0012] a detection component provided between the detection bracket and the detection ring, and used for moving the detection ring;

[0013] The swing component provided between the detection ring and the detection bracket is used to make the detection ring swing at a predetermined angle along its own axis when the detection component drives the detection ring to move.

[0014] Preferably, the detection component includes a screw rotatably connected to the detection bracket, and the detection ring is provided with a connecting frame, which is slidably connected to the detection bracket and cooperates with the screw thread.

[0015] Preferably, the detection bracket is connected to a motor, and a transmission chain is provided between the driving shaft of the motor and the lead screw.

[0016] Preferably, the detection bracket is connected to a mounting bracket, the conveying ring is fixed in the mounting bracket, a plurality of connecting openings are opened on the conveying ring, the conveying shaft is arranged in the connecting opening, the mounting bracket is connected to an oil cylinder, the telescopic shaft of the oil cylinder is connected to a connecting ring, and the conveying shaft is rotatably connected to the connecting ring.

[0017] Preferably, the conveying component includes a support rod connected to the mounting frame, the support rod is connected to a connecting shaft, the connecting shaft is connected to a gear a, the connecting shaft is slidably connected to a sliding shaft a, the conveying shaft is slidably connected to a sliding shaft b, the sliding shaft a and the sliding shaft b are connected by a coupling, and the conveying ring is rotatably connected to a gear b that meshes with the gear a.

[0018] Preferably, after the detection component drives the detection ring to move to a predetermined position along the detection direction and returns to the starting point, the conveying component is triggered to operate, so that the pipe is conveyed axially for a predetermined distance to the next detection position;

[0019] The detection component further includes a gear c connected to the end of the lead screw, one side of the gear b is connected to a gear d meshing with the gear c, and a ratchet mechanism is provided between the lead screw and the gear c.

[0020] Preferably, the swinging component includes a connecting groove opened at the bottom of the detection ring, the connecting frame is slidingly engaged with the connecting groove, a fold line guide rail is fixed on the detection bracket, the outer wall of the detection ring is rotatably connected with a connecting rod, the connecting rod is slidingly engaged with the connecting frame, and extends through the connecting frame to one side of the fold line guide rail, and the end of the connecting rod is connected to a guide rod that is slidingly engaged with the fold line guide rail.

[0021] Preferably, the detection component is capable of locking the conveying shaft when driving the detection ring to move along the detection direction;

[0022] The detection bracket is provided with a positioning opening, a positioning rod is slidably connected in the positioning opening, a spring is connected between the positioning rod and the positioning opening, and one end of the positioning rod is close to the gear a.

[0023] Preferably, a side opening is provided on the connecting frame, a boss is connected to the side opening, one end of the positioning rod is rotatably connected to the connecting rod, one end of the connecting rod is rotatably connected to the connecting bar, the top of the connecting bar is connected to a diamond bar, and a sliding channel is formed between the diamond bar and the connecting bar.

[0024] Preferably, a positioning piece is connected to the side wall of the gear a close to the positioning rod.

[0025] In summary, the present invention mainly has the following beneficial effects:

[0026] To address the existing problem of difficulty covering the entire axis of a long workpiece due to the travel limitations of guide rails or threaded transmission components, this application utilizes a segmented movement of the detection ring in conjunction with the step-by-step feeding of the pipe, transforming the inspection range that originally relied on structural dimensions into a controllable, cyclical inspection process. During the return stroke, the detection ring triggers the movement of the conveying components, enabling the pipe to automatically advance after each inspection section is completed. This allows the entire pipe to be segmented and covered over multiple inspection cycles, thus overcoming the physical limitations of the structural travel and adapting to the need for full-length inspection of workpieces with a wide range of length variations.

[0027] During the inspection process, the inspection ring moves along the pipe's axial direction, collecting profile data section by section. It then rotates and oscillates at a set angle at each inspection location, enabling each set of laser profile sensors to collect information from multiple angles, improving the integrity and measurement accuracy of single-section data. This oscillation mechanism expands the scanning range of multiple laser profile sensors circumferentially, improving coverage of large-diameter pipe sections and enabling the device to adaptively inspect pipes of varying diameters. High-quality measurements of diverse workpieces can be performed without changing the number of laser profile sensors or adjusting their angles.

[0028] In addition, to ensure measurement accuracy and data stability during each inspection process, the conveyor shaft is locked during the axial scanning of the inspection ring, so that the pipe remains in a fixed position during sampling. This locking mechanism effectively suppresses axial movement or shaking of the pipe due to factors such as gravity, micro-vibration, or residual stress release, and prevents error interference caused by relative displacement during contour acquisition. By establishing a strict timing coordination logic between the movement of the inspection ring and the state of the conveyor shaft, the inspection phase and the feeding phase are guaranteed to be independent of each other and do not interfere with each other. This not only improves the spatial continuity and fitting consistency between the sampling points of each section, but also provides a stable and reliable geometric basis for the splicing of multi-point trajectories in the final straightness assessment, ensuring the authenticity, continuity and repeatability of the inspection data in the automated process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 is another schematic diagram of the overall structure of the present invention;

[0031] Figure 3 It is a cross-sectional schematic diagram of the overall structure of the present invention;

[0032] Figure 4 It is a schematic diagram of the conveying ring structure of the present invention;

[0033] Figure 5 is another structural schematic diagram of the conveying ring of the present invention;

[0034] Figure 6 It is a schematic structural diagram of the mounting frame of the present invention;

[0035] Figure 7 is another schematic diagram of the mounting frame structure of the present invention;

[0036] Figure 8 It is a schematic diagram of the conveying shaft structure of the present invention;

[0037] Figure 9 It is a schematic diagram of the connecting shaft structure of the present invention;

[0038] Figure 10 yes Figure 3 A magnified schematic diagram of the local structure at point A;

[0039] Figure 11 It is a schematic diagram of the diamond bar structure of the present invention;

[0040] Figure 12 It is a schematic structural diagram of the ratchet mechanism of the present invention;

[0041] Figure 13 It is a schematic diagram of the broken line guide rail structure of the present invention;

[0042] Figure 14 It is a schematic diagram of the detection ring structure of the present invention.

[0043] Reference numerals:

[0044] 100, detection bracket; 101, conveying ring; 102, conveying shaft; 103, detection ring; 104, laser profile sensor;

[0045] 200, lead screw; 201, connecting frame; 202, motor; 203, transmission chain; 204, mounting frame; 205, connecting opening; 206, oil cylinder; 207, connecting ring;

[0046] 300, support rod; 301, connecting shaft; 302, gear a; 303, sliding shaft a; 304, sliding shaft b; 305, coupling; 306, gear b; 307, gear c; 308, gear d; 309, ratchet mechanism;

[0047] 400, connecting chute; 401, broken line guide rail; 402, connecting rod; 403, guide rod;

[0048] 500, positioning opening; 501, positioning rod; 502, spring; 503, side opening; 504, boss; 505, connecting rod; 506, connecting strip; 507, diamond strip; 508, sliding channel; 509, positioning piece. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] refer to Figures 1-14 The invention discloses a rapid straightness detection device for automobile parts and pipes based on laser measurement technology, comprising a detection bracket 100, a conveying ring 101, a conveying shaft 102, a detection ring 103, a plurality of laser profile sensors 104, a conveying component, a detection component and a swing component.

[0051] The inspection bracket 100 is the basic structure that supports the entire device. It is equipped with two axially spaced conveyor rings 101. Multiple conveyor shafts 102 are located between the conveyor rings 101. These conveyor shafts 102 pass through the conveyor rings 101 and can slide within the conveyor rings 101 to accommodate pipes of different diameters. Each conveyor shaft 102 can also rotate along its own axis to drive the axial conveyance of the pipes.

[0052] A detection ring 103 is provided in the middle of the detection bracket 100. The detection ring 103 is arranged around the pipe and has multiple laser profile sensors 104 fixedly installed inside the detection ring for performing non-contact two-dimensional profile scanning on the cross section of the detected pipe.

[0053] A conveying component is provided between the detection bracket 100 and the conveying shaft 102 , and the conveying component is used to synchronously drive the multiple conveying shafts 102 to achieve axial advancement of the pipe.

[0054] A detection component is provided between the detection bracket 100 and the detection ring 103 , and the detection component is used to drive the detection ring 103 to move along the axis of the pipe.

[0055] A swinging member is provided between the detection ring 103 and the detection bracket 100. This member is designed to cause the detection ring 103 to reciprocate around its axis at a predetermined angle during axial movement. This allows for controlled swinging of the detection ring 103 within an angular range of ±θ, thereby expanding the angular coverage of the laser profile sensor 104 and improving the integrity of cross-sectional inspections for large-diameter pipes.

[0056] In terms of motion control logic, after the detection component drives the detection ring 103 to move to a predetermined position along the detection direction, it then returns to the initial position along the original path. During this return process, the conveying component is triggered to drive multiple conveying shafts 102 to rotate synchronously, thereby realizing the conveying of the pipe a predetermined distance in the axial direction, so that it enters the next position to be tested.

[0057] In addition, during the axial movement of the detection ring 103, the detection component can lock and control the conveying shaft 102, so that the conveying component is in a stationary state, preventing the pipe from axially sliding during the laser measurement process, and ensuring detection accuracy.

[0058] Through the above settings, this application is mainly used to realize the automatic straightness detection of pipeline workpieces. The detection process is completed by the cooperation of multiple mechanisms and is carried out in the following steps:

[0059] The pipe to be tested is manually or mechanically positioned between the two conveyor rings 101. After the multiple conveyor shafts 102 are slid into position, the workpiece is lifted and supported by the conveyor shafts 102. Once the pipe support is secured, the inspection process begins. At this point, the conveyor components are inactive, and the conveyor shafts 102 are locked, preventing axial movement of the pipe due to gravity, residual stress, or external disturbances during inspection, thereby ensuring the stability and validity of the inspection data.

[0060] The detection component activates, driving the detection ring 103 to move along the pipe's axis. As the detection ring 103 moves, multiple laser profile sensors 104 within it begin operating, collecting cross-sectional profile data from the pipe section by section. This process constitutes a multi-point scan along the pipe's length.

[0061] As the detection ring 103 moves axially along the pipe, the swinging components operate synchronously, driving the detection ring 103 to oscillate around its own axis. This oscillation allows the detection path of each laser profile sensor 104 to cover the pipe cross-section at different angles, expanding the effective detection range of each laser profile sensor 104.

[0062] By oscillating and coordinating the layout of multiple laser profile sensors 104, even in the case of large pipe diameters, a limited number of laser profile sensors 104 can complete a complete scan of the entire cross-sectional profile. This design significantly improves the device's adaptability to large workpieces and avoids missed inspections due to blind spots covered by the laser profile sensors 104.

[0063] Each time the laser profiler 104 scans, it generates point cloud data for the current cross section. The operator processes this data, extracting the cross section's center point or fitting the coordinates of the circle center. The center points of multiple cross sections form a spatial point set, which is then fitted with a straight line to determine the actual axis of the pipe. By comparing the deviation between the actual axis and the theoretical straight line, the pipe's straightness index is calculated. This method not only improves detection accuracy but also reduces human error, resulting in higher consistency.

[0064] After the detection ring 103 continues to advance and completes a predetermined measurement, the detection component controls the detection ring 103 to return along its original path to its starting position. During this return stroke, the detection component triggers the conveying component, releasing the conveying shaft 102 from its locked state and starting its rotation, conveying the pipe along its axial direction by a set step distance. This conveying process ensures that the next section to be measured accurately enters the effective travel range of the detection ring 103.

[0065] After the pipe is conveyed, the conveyor shaft 102 enters the locked state again to allow for a new round of cross-sectional profile acquisition and straightness calculation. The introduction of the locking mechanism establishes a stable detection period during the gaps between workpiece position changes, effectively preventing data jitter caused by workpiece shaking.

[0066] The above-mentioned cyclic process of detection movement, swing scanning, return feeding and re-locking can run continuously, forming a closed automated detection chain to achieve a fast and coherent detection rhythm.

[0067] This process enables non-contact, multi-angle, high-coverage, and highly consistent rapid and automatic straightness testing of pipes. Particularly in scenarios involving continuous testing of pipes of various specifications, this application significantly improves testing efficiency while maintaining accuracy, reduces manual reliance, and enhances measurement stability and consistency. This addresses the existing technical issues associated with linearity testing of pipelines, such as the difficulty of achieving full coverage of longer pipes due to the limited travel of fixed guide rails or threaded transmission components, which limits the detection area and results in incomplete measurement results.

[0068] In this embodiment, the detection component includes a screw 200 rotatably connected to the detection bracket 100. The screw 200 can be driven by an external drive device to rotate about its own axis. The detection ring 103 is provided with a connecting bracket 201, which is slidably connected to the detection bracket 100, can be guided and moved along the axial direction of the pipe, and is threadedly engaged with the screw 200.

[0069] With this arrangement, during the inspection process, the screw 200 is driven to rotate, and the threaded coupling 201 is driven to move axially along the inspection bracket 100 through the side effects of the thread, thereby achieving linear displacement of the inspection ring 103. This structure maintains the movement accuracy of the inspection ring 103 while enabling controllable adjustment of the displacement rhythm. This, in conjunction with the internal laser profile sensor 104, completes cross-section inspection and provides a precise axial data acquisition path for subsequent straightness analysis.

[0070] In this embodiment, a motor 202 is fixedly mounted on the detection bracket 100. The drive shaft of the motor 202 is connected to the lead screw 200 via a transmission chain 203, forming a power transmission mechanism. The transmission chain 203 is wound around a driving sprocket on the output shaft of the motor 202 and a driven sprocket at the end of the lead screw 200, respectively, to transmit the rotational motion of the motor 202 to the lead screw 200.

[0071] With the above arrangement, when the motor 202 is started, the drive shaft drives the active sprocket to rotate, which in turn drives the driven sprocket to rotate via the transmission chain 203, thereby achieving rotational drive of the lead screw 200. This chain drive structure is simple and responsive, effectively improving the transmission efficiency and torque output stability during the rotation of the lead screw 200.

[0072] In this embodiment, the detection bracket 100 is connected to a mounting frame 204 for supporting the conveying structure. The conveying ring 101 is fixedly mounted in the mounting frame 204 and serves as a ring-shaped component supporting multiple conveying shafts 102, forming a positioning and conveying reference surface for the pipes.

[0073] The conveying ring 101 is provided with a plurality of connection openings 205, and a conveying shaft 102 is provided in each connection opening 205. The conveying shaft 102 is used to support the pipe to be tested and can rotate along its own axis to cooperate with the feeding action of the pipe.

[0074] To achieve controlled lifting of the conveyor shafts 102, a number of oil cylinders 206 are connected to the mounting frame 204. The ends of the telescopic shafts of the oil cylinders 206 are connected to connecting rings 207. The connecting rings 207 and the corresponding conveyor shafts 102 are rotatably connected. Specifically, the ends of the conveyor shafts 102 are inserted into the connecting rings 207 and can rotate relative to them, allowing them to rise and fall as a whole with the oil cylinders 206, driven by the connecting rings 207, while still maintaining the rotational freedom of the axis.

[0075] Through this arrangement, when the oil cylinder 206 is activated, the connecting ring 207 drives the conveyor shaft 102 to move radially up and down, lifting or releasing the pipe. During the feeding phase, the conveyor shaft 102, while maintaining its height, is driven by a transmission device to rotate, thereby propelling the pipe axially. This structure allows the conveyor shaft 102 to perform both support and clamping functions and rotary feeding functions. The overall structure is simple and flexible, making it suitable for the rapid positioning and controlled delivery of pipes of varying specifications.

[0076] In this embodiment, the conveying assembly includes a support rod 300 connected to the mounting bracket 204. A connecting shaft 301 is fixedly mounted on the support rod 300. This shaft supports a gear a302 and serves as a fixed input shaft in the rotational transmission path. The connecting shaft 301 remains stationary axially and is provided with a gear a302. This gear a302 meshes with a gear b306, which is rotatably connected to the conveying ring 101.

[0077] To ensure continuous transmission between the connecting shaft 301 and the conveying shaft 102 during lifting and lowering, a sliding shaft a303 is slidably connected to the connecting shaft 301. Correspondingly, a sliding shaft b304 is slidably connected to the conveying shaft 102. Sliding shaft a303 and sliding shaft b304 are connected via a coupling 305, thereby achieving synchronous rotation between the two. The coupling 305 can be a cross-shaped, plum blossom-shaped, or universal joint structure.

[0078] Through the above arrangement, during actual operation, the oil cylinder 206 drives the connecting ring 207 to extend and retract, thereby driving the conveying shaft 102 toward or away from the axis of the conveying ring 101, that is, achieving radial lifting. When the conveying shaft 102 changes position due to the operation of the oil cylinder 206, the sliding shaft b304 driven by it also moves up and down, resulting in a change in the axial distance and angular offset between it and the connecting shaft 301. At this time, the sliding shaft a303 can slide on the connecting shaft 301 and the sliding shaft b304 can slide on the conveying shaft 102 to achieve angular and length compensation capabilities, adaptively adjusting the relative positions, so that the rotational power of the connecting shaft 301 can be continuously and stably transmitted to the conveying shaft 102, ensuring that the conveying shaft 102 can maintain a normal rotational drive state during the lifting process. The above solution has a compact structure and a stable transmission path. The compensation structure composed of the coupling 305 and the sliding shaft has good angular and axial adaptability. It is particularly suitable for working conditions where the height position of the conveying shaft 102 is adjusted due to changes in the diameter of the pipe. While ensuring transmission continuity, it can flexibly adapt to changes in the outer diameter dimensions of pipes to be tested of different specifications, significantly improving the structural adaptability and detection stability of the device.

[0079] In this embodiment, the detection component also includes a gear c307 mounted at the end of the lead screw 200. Gear c307 is used to establish a linkage with the conveying system, enabling triggering and controlling the feeding action during the return stroke of the detection ring 103. Gear d308 is connected to one side of gear b306, which meshes with gear c307 to form an indirect power transmission path.

[0080] To further achieve selective control of the transmission direction, a ratchet mechanism 309 is provided between the lead screw 200 and the gear c307. The ratchet mechanism 309 is used to limit the gear c307 to generate effective rotational transmission relative to the lead screw 200 in only one direction.

[0081] With this arrangement, when screw 200 rotates in the direction of detection ring 103's movement, ratchet mechanism 309 idles and does not drive gear c307. However, when screw 200 rotates in the return direction, ratchet mechanism 309 engages, causing gear c307 to rotate accordingly, thereby driving gear d308 and gear b306 to rotate, thereby driving the conveyor shaft 102. This ensures that feeding is triggered only during the return phase of detection ring 103, creating a sequential linkage logic of "feeding stops during detection and starts during return." This avoids data interference caused by overlapping feeding and detection, improving system coordination and the stability of detection data.

[0082] Specifically, during the inspection process, the lead screw 200 continuously rotates under the drive of the motor 202, driving the inspection ring 103 to move axially along the pipe. During this stage, the ratchet mechanism 309 is in a non-meshing state, and the effective transmission between gear C307 and the lead screw 200 is disengaged, preventing gears D308 and B306 from being accidentally driven during the inspection process. When the inspection ring 103 moves to the set end point, the motor 202 controls the lead screw 200 to rotate in the opposite direction, causing the inspection ring 103 to return along the original path to the starting position. During the reverse rotation of the lead screw 200, the ratchet mechanism 309 enters a meshing state, and gear C307 begins to rotate synchronously with the lead screw 200. Through the meshing relationship with gear D308, it drives gear B306 to rotate, thereby driving the conveyor shaft 102. The conveyor shaft 102 begins to rotate synchronously. After the inspection ring 103 returns to the starting point, the motor 202 stops driving, the lead screw 200 stops rotating, and the pipe is conveyed axially by a set step distance, completing a feeding operation. The inspection component then restarts, and the inspection ring 103 begins the next inspection stroke. This process achieves rhythmic linkage control of inspection and feeding, ensuring that each stage of the process does not interfere with each other and maintains a clear and well-defined process. This device, without the need for complex laser profile sensors 104 or multi-motor 202 control units, implements a feeding trigger mechanism driven by the rhythm of mechanical motion. It offers a simple structure, strong synchronization, and high reliability, making it particularly suitable for automated pipe inspection scenarios with clear rhythms and fixed workstations.

[0083] In this embodiment, the swinging member includes a connecting groove 400 provided at the bottom of the detection ring 103. The connecting groove 400 slidably cooperates with the connecting frame 201 on the detection member to achieve a rotational guide connection of the detection ring 103 relative to the connecting frame 201. A broken line guide rail 401 is fixedly mounted on the detection bracket 100.

[0084] The outer wall of the detection ring 103 is rotatably connected to a connecting rod 402, which is slidably connected to the connecting frame 201 and extends through the connecting frame 201 to one side of the folding guide rail 401 and is connected to a guide rod 403. The guide rod 403 is slidably matched with the folding guide rail 401.

[0085] Through the above-mentioned setting, when the detection component drives the detection ring 103 to move axially along the pipe fitting, the guide rod 403 advances along the folded line guide rail 401. Due to the ups and downs of the folded line guide rail 401 on the path, the guide rod 403 moves up and down with the ups and downs of the track, thereby driving the connecting rod 402 to produce up and down reciprocating motion along its axial direction.

[0086] Because the connection between the upper end of the connecting rod 402 and the detection ring 103 has an angled offset structure, and the connecting groove 400 at the bottom forms a rotation guide with the connecting frame 201, when the connecting rod 402 moves up and down, this up and down movement is converted into a micro-angle swing of the detection ring 103 around its own axis, thereby achieving multi-angle coverage of multiple laser profile sensors 104 along the detection path. The above-mentioned arrangement can automatically achieve rotational and swinging motion during the movement of the detection ring 103 simply through the structural coordination of the connecting rod 402 and the broken line guide 401. It has a simple structure and stable operation, and can expand the detection angle range without increasing the number of laser profile sensors 104, thereby improving the detection coverage capability of large-diameter cross-section pipes. It is particularly suitable for high-coverage scanning of pipes of various diameter specifications in continuous rhythmic inspection, significantly improving the detection integrity and adaptability.

[0087] In this embodiment, a positioning opening 500 is formed on the detection bracket 100 , and a positioning rod 501 is slidably connected in the positioning opening 500 , and the axial direction of the positioning rod 501 faces the gear a302 .

[0088] A spring 502 is provided between the positioning rod 501 and the positioning opening 500. One end of the spring 502 abuts the inner wall of the positioning opening 500, and the other end abuts the positioning rod 501. This allows the positioning rod 501 to remain pre-tightened toward gear a302 under the action of the spring 502. One end of the positioning rod 501 is positioned adjacent to gear a302, and when gear a302 rotates to a specific angle or position, it contacts its sidewall, thereby achieving mechanical limiting.

[0089] With this arrangement, when the detection component drives the detection ring 103 forward in the detection direction (i.e., performing the detection process), the detection ring 103 and the positioning rod 501 undergo relative motion, causing the positioning rod 501 to slide inward due to structural interference or contact, overcoming the preload force of the spring 502 and pressing into the positioning opening 500. At this point, the end of the positioning rod 501 contacts the side of gear a302 or its connection, restricting the free rotation of gear a302, thereby temporarily locking the transmission chain in which gear a302 resides. This, in turn, restricts the rotation of gear b306 and the conveyor shaft 102, maintaining a stable locked state for the conveyor shaft 102, ensuring that the pipe remains in place during the inspection process and preventing disturbances that could affect measurement accuracy. When the detection ring 103 completes its inspection task and returns to its starting position along its original path, the positioning rod 501 is released from pressure and, guided by the spring 502, automatically resets and pops out, releasing the restraint on gear a302. A mechanical linkage control logic of "locking during detection, unlocking during return + feeding" was constructed. It has a simple structure and clear actions, avoids interference between the feeding and detection stages, and effectively improves the system's beat controllability, detection stability and feeding response accuracy.

[0090] In this embodiment, the connecting frame 201 has a side opening 503, into which a boss 504 is fixedly connected, providing a stable support base for the subsequent movement of the connecting rod 402. One end of the positioning rod 501 is rotatably connected to a connecting rod 505 via a pin structure, and the other end of the connecting rod 505 is rotatably connected to a connecting bar 506, thereby forming a transmission transfer mechanism in space.

[0091] A diamond-shaped bar 507 is connected to the top of the connecting bar 506 , and a sliding channel 508 is preset between the diamond-shaped bar 507 and the connecting bar 506 .

[0092] Through the above arrangement, when the detection ring 103 moves along the detection direction, the boss 504 can press the left end of the diamond bar 507, causing the diamond bar 507 and the connecting bar 506 to move downward, thereby driving the connecting rod 505 to press the positioning rod 501 into the side wall of the gear a302, and using the mechanical locking force to achieve mechanical locking of the rotation of the gear a302, ensuring the stability of the workpiece during measurement. When the detection ring 103 completes its forward movement and begins its return stroke, the boss 504 moves to the end of the diamond bar 507 and disengages from the diamond bar 507. When the connecting frame 201 returns, the boss 504 will change from contacting the left end of the diamond bar 507 to pressing its right end. At this time, the diamond bar 507 moves upward under the pushing action of the boss 504, driving the connecting bar 506 to lift, releasing the pressure on the positioning rod 501, and the positioning rod 501 automatically rebounds and disengages from the side wall of the gear a302 under the action of the spring 502. The boss 504 can slide back to its position in the sliding channel 508, so that the positioning function and the reciprocating movement of the detection ring 103 naturally form a linkage, completing the automatic unlocking of the feeding stage and the mechanical locking of the detection stage.

[0093] In this embodiment, to further improve the limiting accuracy and mechanical stopping reliability of the positioning rod 501, a positioning piece 509 is provided on the outer wall of the gear a302 near the positioning rod 501. The positioning piece 509 is preferably a protruding block integrally processed or fixedly connected to the gear a302, and has a diamond-shaped mesh pattern for increasing friction.

[0094] With this arrangement, when the detection ring 103 moves in the detection direction and the linkage mechanism drives the positioning rod 501 to press against the outside of gear a302, the end of the positioning rod 501 precisely aligns and contacts the textured surface of the positioning piece 509. The multi-angle protrusions formed by the diamond-shaped texture create greater frictional resistance on the contact surface, preventing problems such as slippage or jump of the positioning rod 501 caused by micro-motion or vibration of the gears, thereby achieving a more stable and reliable mechanical limit.

[0095] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. The rapid straightness detection device for automobile parts and pipes based on laser measurement technology is characterized by: include: A detection bracket (100), wherein two conveying rings (101) are provided on the detection bracket (100); A plurality of conveying shafts (102) provided in the two conveying rings (101); a detection ring (103) disposed within the detection bracket (100), wherein a plurality of laser profile sensors (104) are disposed within the detection ring (103); A conveying component provided between the detection bracket (100) and the conveying shaft (102), used for synchronously rotating a plurality of the conveying shafts (102); A detection component provided between the detection bracket (100) and the detection ring (103), used for moving the detection ring (103); a swing component provided between the detection ring (103) and the detection bracket (100), for causing the detection ring (103) to swing at a predetermined angle along its own axis when the detection component drives the detection ring (103) to move; After the detection component drives the detection ring (103) to move to a predetermined position along the detection direction and returns to the starting point, the conveying component is triggered to operate, so that the pipe is conveyed along the axial direction for a predetermined distance to enter the next detection position; The detection component is capable of locking the conveying shaft (102) when driving the detection ring (103) to move along the detection direction; The detection bracket (100) is connected to a mounting bracket (204); The conveying component comprises a support rod (300) connected to the mounting frame (204), a connecting shaft (301) connected to the support rod (300), a gear a (302) connected to the connecting shaft (301), and a gear b (306) rotatably connected to the conveying ring (101) and meshing with the gear a (302); The detection component includes a gear c (307) connected to the end of the lead screw (200), a gear d (308) meshing with the gear c (307) is connected to one side of the gear b (306), and a ratchet mechanism (309) is provided between the lead screw (200) and the gear c (307); The detection bracket (100) is provided with a positioning opening (500), a positioning rod (501) is slidably connected in the positioning opening (500), a spring (502) is connected between the positioning rod (501) and the positioning opening (500), and one end of the positioning rod (501) is close to the gear a (302); A side opening (503) is provided on the connecting frame (201), a boss (504) is connected in the side opening (503), one end of the positioning rod (501) is rotatably connected to a connecting rod (505), one end of the connecting rod (505) is rotatably connected to a connecting bar (506), the top of the connecting bar (506) is connected to a diamond bar (507), and a sliding channel (508) is formed between the diamond bar (507) and the connecting bar (506).

2. The device for rapid straightness detection of automobile parts and pipes based on laser measurement technology according to claim 1 is characterized in that: The detection component further comprises a lead screw (200) rotatably connected to the detection bracket (100); a connecting frame (201) is provided on the detection ring (103); the connecting frame (201) is slidably connected to the detection bracket (100) and threadedly engaged with the lead screw (200); A motor (202) is connected to the detection bracket (100), and a transmission chain (203) is provided between the drive shaft of the motor (202) and the lead screw (200).

3. The device for rapid straightness detection of automobile parts and pipes based on laser measurement technology according to claim 1 is characterized in that: The conveying ring (101) is fixed in the mounting frame (204); a plurality of connecting openings (205) are provided on the conveying ring (101); the conveying shaft (102) is arranged in the connecting openings (205); an oil cylinder (206) is connected to the mounting frame (204); a connecting ring (207) is connected to the telescopic shaft of the oil cylinder (206); and the conveying shaft (102) is rotatably connected to the connecting ring (207).

4. The device for rapid straightness detection of automobile parts and pipes based on laser measurement technology according to claim 3 is characterized in that: The connecting shaft (301) is slidably connected to a sliding shaft a (303), and the conveying shaft (102) is slidably connected to a sliding shaft b (304). The sliding shaft a (303) and the sliding shaft b (304) are connected via a coupling (305).

5. The device for rapid straightness detection of automobile parts and pipes based on laser measurement technology according to claim 1 is characterized in that: The swing component includes a connecting groove (400) opened at the bottom of the detection ring (103), the connecting frame (201) is slidably matched with the connecting groove (400), a folded line guide rail (401) is fixed on the detection bracket (100), and the outer wall of the detection ring (103) is rotatably connected with a connecting rod (402), the connecting rod (402) is slidably matched with the connecting frame (201), and extends through the connecting frame (201) to one side of the folded line guide rail (401), and the end of the connecting rod (402) is connected to a guide rod (403) that is slidably matched with the folded line guide rail (401).

6. The device for rapid straightness detection of automobile parts and pipes based on laser measurement technology according to claim 1 is characterized in that: A positioning piece (509) is connected to the side wall of the gear a (302) close to the positioning rod (501).

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