An elongated bar on-line defect detection system

Abstract

The present application belongs to the technical field of nuclear fuel rod surface defect detection, and particularly relates to an online defect detection system for slender rods, which is characterized in that a to-be-detected station, two circumferential detection stations, an end detection station, an angle adjustment station and a re-detection station are sequentially arranged on the detection platform from back to front, thereby realizing the sequential detection of the circumferences and ends of the slender rods and the re-detection of defective products, and the detection between the stations can be simultaneously performed, that is, the detection of multiple slender rods can be satisfied at the same time, and the detection efficiency is improved; the slender rods are moved and placed by means of suspension and clamping and overturning, and during the circumferential detection and re-detection, the slender rods are in a stationary state, the circumferential detection module and the re-detection module move along the axial direction of the slender rods for detection, thereby avoiding the slender rods from being scratched during the detection process, and the re-detection module is used for re-detecting the defective positions, thereby effectively ensuring the product quality of the slender rods.

Description

Technical Field

[0001] This invention pertains to nuclear fuel rod surface defect detection technology, specifically relating to an online defect detection system for slender rods. Background Technology

[0002] Objects with slender, elongated circular cross-sections refer to industrial products with a length-to-diameter ratio greater than 50, a typical length of 2m, a diameter of 5mm or more, and stringent surface quality requirements. These are circular cross-sections used in precision or critical applications. With the high-quality development of industry, increasingly stringent requirements are being placed on the surface quality of objects with slender, elongated circular cross-sections. For example, the straightness, welding quality, and surface defects of nuclear cladding tubes and fuel rods require online full inspection, including data acquisition, analysis, judgment, and storage. In particular, the 0.025mm surface depth requirement is a decisive factor for safety, and it is data that mainstream surface defect detection does not require. The requirement that no new defects be generated during surface movement and that surface depth be detected without omission poses challenges to mechanical structures and inspection requirements.

[0003] Typical parameters for nuclear cladding tubes are an outer diameter of approximately 10 mm, a wall thickness of approximately 0.6 mm, and a length of 4 m. To ensure the fuel rods can operate for extended periods under high temperature, high pressure, and intense radiation conditions, extremely stringent defect requirements are imposed, particularly regarding surface defect depth, which must generally not exceed 25-30 μm. This is to prevent failure due to stress corrosion or radiation damage during reactor operation. Furthermore, fuel rod inspection, in addition to the cladding tube inspection requirements, also needs to assess the sealing effectiveness at the ends.

[0004] Chinese patent document CN116174341A (202310328550.5) discloses a device and method for detecting the appearance defects and full parameters of nuclear fuel rods. The above technical solution uses a stationary linear array camera recognition module and a line laser scanning module to detect nuclear fuel rods in motion. In order to avoid the nuclear fuel rods rotating and causing damage to the surface of the nuclear fuel rods during the detection process, the above technical solution uses a longitudinal transmission gripper to feed the nuclear fuel rods on the feeding mechanism at the feed end of the surface defect detection mechanism axially through the longitudinal transmission gripper block and through the surface defect detection mechanism for detection. After the nuclear fuel rod is detected, the longitudinal transmission gripper needs to be reset before the next nuclear fuel rod can be detected, resulting in low detection efficiency. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an online defect detection system for slender bars. The system comprises, from back to front, a detection platform with one inspection station, two circumferential inspection stations, one end inspection station, one angle adjustment station, and one re-inspection station. This enables sequential inspection of the circumference and ends of slender bars, as well as re-inspection of defective products. Inspections at each station can be performed simultaneously, allowing for the inspection of multiple slender bars at the same time, thus improving inspection efficiency. This invention utilizes suspension and clamping / tilting to move and place the slender bars. During circumferential and re-inspection, the slender bars remain stationary. The circumferential inspection module and the re-inspection module move along the axial direction of the slender bars, preventing scratches during inspection. The re-inspection module further ensures the quality of the slender bars.

[0006] The technical problem to be solved by the present invention is achieved by the following technical solution: an online defect detection system for slender bars, comprising a detection platform, a feeding unit and a detection unit; The feeding unit includes a rolling feeding module and a first clamping, suspension and translation mechanism; The detection unit includes a station to be inspected, a circumferential detection station, an end detection station, an angle adjustment station, a re-inspection station, a clamping and flipping module, a second clamping, suspension and translation mechanism, a circumferential detection module, an end detection module and a re-inspection module; The inspection station, circumferential inspection station, end inspection station, angle adjustment station, and re-inspection station all include multiple support platforms arranged linearly at intervals along the left and right directions. The upper end of each support platform is provided with a limiting groove, which is V-shaped. The circumferential inspection station corresponds to a circumferential angle greater than 180 degrees on the circumferential surface of the slender bar to be inspected within the limiting groove. One end of the angle adjustment station is equipped with a clamping and rotating mechanism; The rolling feeding module includes multiple support conveying units arranged linearly at intervals along the left and right directions; The rolling feeding module is located at the rear of the inspection platform. One inspection station, two circumferential inspection stations, one end inspection station, one angle adjustment station, and one re-inspection station are arranged on the inspection platform from back to front, with each station arranged in parallel. The first clamping, suspension and translation mechanism is located above the rolling feeding module and the inspection station, and the second clamping, suspension and translation mechanism is located above the end detection station, the angle adjustment station and the re-inspection station; A set of clamping and flipping modules is provided in the interval between adjacent inspection stations, circumferential inspection stations and end inspection stations. The clamping and flipping module is used to clamp the slender bar and flip it 180 degrees to ensure that the slender bar is placed on the front circumferential inspection station after being flipped 180 degrees from the rear circumferential inspection station. The circumferential detection module is slidably mounted above the circumferential detection station, the end detection module is mounted at the end of the end detection station, and the re-inspection module is slidably mounted above the re-inspection station. The re-inspection module has higher detection accuracy than the circumference detection module.

[0007] Preferably, the present invention further includes a feeding unit, wherein the feeding unit includes a rolling feeding module; The rolling feeding module includes multiple support conveying units arranged linearly at intervals along the left and right directions; The rolling feeding module is set on the front side of the detection platform or flush with the angle adjustment station, that is, the rolling feeding module and the angle adjustment station are on the same straight line and spliced ​​together. When the rolling feeding module is set flush with the angle adjustment station, the support platform of the angle adjustment station located above the detection platform and the support conveying unit of the rolling feeding module are arranged alternately. When the rolling feeding module is positioned at the front of the inspection platform, it is located below the second clamping, suspension, and translation mechanism. The feeding unit transports the inspected, qualified slender bars to the next process. The rolling feeding module can be positioned at the front of the inspection platform or flush with the angle adjustment station. When the rolling feeding module is flush with the angle adjustment station, the support platform of the angle adjustment station above the inspection platform and the support conveying unit of the rolling feeding module are arranged alternately, allowing the slender bars at the angle adjustment station to be directly transported out of the inspection platform, further simplifying the structure of the inspection system and reducing its size. When the rolling feeding module is positioned at the front of the inspection platform, it is located below the second clamping, suspension, and translation mechanism, facilitating the movement of the slender bars from the angle adjustment station onto the rolling feeding module using the second clamping, suspension, and translation mechanism.

[0008] Preferably, the circumference detection module of the present invention includes a 3D camera detection unit and a line scan camera detection unit; The 3D camera detection unit includes two or more 3D cameras spaced apart along the circumference of the slender bar. The linear array camera detection unit includes two or more linear array cameras that are spaced apart along the circumference of the slender bar. Preferably, the 3D camera is integrated and fixedly mounted in the same housing.

[0009] In this invention, a 3D camera module acquires the depth and width information of defects; a line scan camera scans the images, and a deep learning algorithm is used to identify dents, pits, grooves, and scratches. The data from the 3D camera module is automatically compared with the defect location data, allowing the detection results of the two devices to corroborate each other and ensure the accuracy of the detection data. When discrepancies exist between the detection results of the two devices, a higher-precision re-inspection module can be used for re-inspection, ensuring accurate identification of defects.

[0010] Two or more 3D cameras and line scan cameras are distributed at intervals along the circumference of the slender bar to ensure that the circumferential surface of the slender bar with a circumferential angle greater than or equal to 180 degrees can be detected simultaneously, thereby ensuring comprehensive detection of the circumference of the slender bar.

[0011] By integrating and fixing the 3D cameras in the same housing, and fixing the angle and position of each 3D camera, when a problem occurs in the 3D camera detection unit, the entire unit can be replaced without adjusting the angle and position of the 3D cameras, thus shortening maintenance time and helping to maintain production efficiency.

[0012] Preferably, in this invention, two or more circumferential detection modules are provided above each circumferential detection station, and the circumferential detection modules are evenly spaced along the length direction of the slender bar. The circumferential detection module performs synchronous detection along the same direction; Preferably, two adjacent circumferential detection modules above two circumferential detection stations are mounted on the same sliding block for synchronous detection, which further improves detection efficiency. Using two or more circumferential detection modules spaced apart to simultaneously detect the circumferential surface of slender bars allows for completion of the circumferential detection within a shorter stroke, further enhancing detection efficiency.

[0013] Preferably, the end detection module of the present invention includes a 3D camera and an area scan camera; The 3D camera and the area scan camera are slidably mounted on the inspection platform. The 3D camera and the area scan camera are used to inspect the sealing weld area at both ends. Defects are calculated using 2D grayscale images. The 3D camera can calculate height defects that cannot be identified by 2D grayscale images. Preferably, the re-inspection module includes a spectral confocal line sensor, a line scan camera, and a lifting linear module. The spectral confocal line sensor and the line scan camera are slidably mounted on the lifting linear module, and the lifting linear module is slidably mounted on the inspection platform. During circumferential inspection, if the line scan camera detects defects such as scratches or dents, but the 3D camera detects no abnormalities or may detect abnormalities (e.g., the defect size is critical, or it may be misjudged as a scratch), the spectral confocal line sensor is used for re-inspection to measure depth information with high precision, ensuring effective defect detection.

[0014] In the re-inspection module, the linear array camera is used to measure defects in the bar stock, mainly to identify scratches, while the spectral confocal sensor is used to measure the depth of the scratches.

[0015] Preferably, the clamping and flipping module of the present invention includes a rotating shaft, a plurality of gripper modules spaced apart on the rotating shaft, and a rotation drive module for driving the rotating shaft; the rotating shaft is set parallel to the circumferential detection station; The gripper module is located in the gap between two adjacent support platforms. A rotating shaft drives the gripper module to rotate synchronously, flipping the slender bar 180 degrees and moving it to the adjacent workstation. This effectively ensures the flipping angle of the slender bar, guaranteeing accurate merging of data detected at the two circumferential inspection workstations, forming complete inspection data for the same slender bar along its circumference.

[0016] Preferably, the present invention further includes a lifting module, the lifting module comprising a plurality of lifting rods arranged linearly at intervals, the lifting rods being located between two adjacent support platforms; The upper end of the lifting rod is provided with a V-groove. After the slender bar is lifted by the lifting rod, it is clamped and moved, which avoids scratches caused by relative movement between the slender bar and the work station.

[0017] Preferably, the first clamping suspension translation mechanism and the second clamping suspension translation mechanism include two spaced-apart front-to-back translation linear modules and a clamping unit disposed on the front-to-back translation linear modules; The clamping unit includes a lifting mechanism and a clamping mechanism. The lifting mechanism is slidably mounted on the forward and backward translational linear module, and the clamping mechanism is located at the lower end of the lifting mechanism. The two clamping mechanisms clamp both ends of the slender bar. After the lifting mechanism lifts the slender bar, the forward and backward translational linear module suspends and moves the slender bar above the next workstation. Then, the lifting mechanism and clamping mechanism are controlled to place the slender bar above the workstation, effectively ensuring the safety of the slender bar during movement.

[0018] Preferably, the present invention also includes a platform for defective products and a buffer platform set between the angle adjustment station and the re-inspection station; Both the non-conforming product platform and the buffer platform are located below the second clamping, suspension, and translation mechanism. The platform for non-conforming products is located in front of the testing platform; The buffer platform is equipped with multiple storage slots arranged in parallel. Products that fail re-inspection are placed on the non-conforming product platform for recycling. The buffer platform, located between the angle adjustment station and the re-inspection station, temporarily stores re-inspected products, preventing interference with the circumferential and end-point inspection stations and ensuring stable inspection progress and efficiency. The parallel arrangement of storage slots on the buffer platform also prevents slender bars from colliding with each other.

[0019] Preferably, the present invention also includes a purging device; The purging device is located above the corresponding support conveyor unit of the rolling feeding module; The purging device is mounted above the support conveyor unit and can slide left and right via a linear module. It is used to clean the surface of the slender bars to be inspected, preventing any impact on the inspection results.

[0020] Compared with the prior art, the beneficial effects of the present invention are: This invention features a rolling feeding module at the rear of the inspection platform. One inspection station, two circumferential inspection stations, one end inspection station, one angle adjustment station, and one re-inspection station are spaced apart from each other from back to front relative to the rolling feeding mechanism on the inspection platform. The rolling feeding module delivers slender bars to the inspection platform. A first clamping, suspension, and translation mechanism moves the slender bars to the inspection station, ensuring continuous feeding. Since the circumferential angle of the slender bar's circumferential surface to be inspected in the limiting groove corresponding to the circumferential inspection station is greater than 180 degrees, this invention utilizes the circumferential inspection module to sequentially inspect both sides of the slender bar at the two circumferential inspection stations, improving inspection efficiency and enabling simultaneous inspection of two slender bars. Then, the end detection module is used to inspect the end of the slender bar at the end detection station. The slender bar suspected of having defects is adjusted at the angle adjustment station and then moved to the re-inspection station using the second clamping suspension translation mechanism. The re-inspection module is used to re-inspect the defect location to ensure the accuracy of the detection.

[0021] This invention utilizes a first clamping, suspension, and translation mechanism, a second clamping, suspension, and translation mechanism, and a clamping and flipping module to clamp and move slender bars to different workstations. During the inspection process, the slender bars remain stationary, thus effectively preventing scratches caused by movement during inspection. The clamping and flipping module flips the slender bars after clamping them for feeding, ensuring the correct placement angle, increasing feeding speed, and minimizing space requirements.

[0022] In this invention, the inspection station, circumferential inspection station, end inspection station, angle adjustment station, and re-inspection station are arranged sequentially from back to front on the inspection platform relative to the rolling feeding mechanism, saving space required for the inspection area. Furthermore, the inspection of slender bars at the circumferential inspection station, end inspection station, angle adjustment station, and re-inspection station does not interfere with each other and can be performed simultaneously, improving inspection efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the online defect detection system for slender bars described in Embodiment 1 of the present invention; Figure 2 This is a three-dimensional representation of the online defect detection system for slender bars described in Embodiment 1 of the present invention. Figure 1 ; Figure 3 This is a three-dimensional representation of the online defect detection system for slender bars described in Embodiment 1 of the present invention. Figure 2 ; Figure 4 This is a three-dimensional representation of the online defect detection system for slender bars described in Embodiment 1 of the present invention. Figure 3 ; Figure 5 This is a schematic diagram of the circumference detection module according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the end detection module according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the online defect detection system for slender bars described in Embodiment 2 of the present invention; In the figure, there are: inspection platform 100, rolling feeding module 1, first clamping suspension translation mechanism 2, inspection station 3, circumferential inspection station 4, end inspection station 5, angle adjustment station 6, re-inspection station 7, clamping flipping module 8, second clamping suspension translation mechanism 9, circumferential inspection module 10, end inspection module 11, and re-inspection module 12. Support platform 200, limiting groove 201, support conveying unit 300; Scroll feeding module 13; 3D camera detection unit 101, line scan camera detection unit 102, 3D camera 400, line scan camera 500, area scan camera 600, spectral confocal line sensor 700, and lifting linear module 800. Rotary shaft 81, gripper module 82; Lifting module 14, lifting rod 141, forward and backward translational linear module 900, defective product platform 15, buffer platform 16, storage tank 161, purging device 17. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will now be clearly and completely described in conjunction with the accompanying drawings.

[0025] The device in this embodiment, whose specific structure is not disclosed, is a non-standard design. Those skilled in the art can make conventional selections based on the functional description.

[0026] Example 1 like Figures 1-6 As shown, an online defect detection system for slender bars includes a detection platform 100, a feeding unit, and a detection unit.

[0027] The feeding unit includes a rolling feeding module 1 and a first clamping, suspension and translation mechanism 2.

[0028] The detection unit includes a station to be inspected 3, a circumferential detection station 4, an end detection station 5, an angle adjustment station 6, a re-inspection station 7, a clamping and flipping module 8, a second clamping, suspension and translation mechanism 9, a circumferential detection module 10, an end detection module 11, and a re-inspection module 12.

[0029] The inspection station 3, circumferential inspection station 4, end inspection station 5, angle adjustment station 6, and re-inspection station 7 all include multiple support platforms 200 arranged linearly at intervals along the left and right directions. Each support platform 200 has a limiting groove 201 at its upper end. The limiting groove 201 is V-shaped. The circumferential inspection station 4 corresponds to a circumferential angle greater than 180 degrees on the circumferential surface of the slender bar material to be inspected within the limiting groove 201.

[0030] The angle adjustment station 6 is equipped with a clamping and rotating mechanism at one end. In this embodiment, the clamping and rotating mechanism uses an electric rotating jaw to ensure the accuracy of the rotation position. By using the clamping and rotating mechanism to clamp one end of the slender bar and rotate it, the rotation angle and detection position of the slender bar can be effectively controlled.

[0031] The end of the inspection station 3 is also equipped with a clamping and rotating mechanism, and a barcode scanning device (not shown in the figure) is set above the inspection station 3 to record the coding information of the slender bar.

[0032] The rolling feeding module 1 includes multiple support conveying units 300 arranged linearly at intervals along the left-right direction. The support conveying units 300 use rollers or belts for transmission to avoid scratching the bar stock.

[0033] The rolling feeding module 1 is located on the rear side of the inspection platform 100. One inspection station 3, two circumferential inspection stations 4, one end inspection station 5, one angle adjustment station 6, and one re-inspection station 7 are arranged on the inspection platform 100 from back to front, spaced apart from each other relative to the rolling feeding mechanism 1.

[0034] The first clamping, suspension, and translation mechanism 2 is located above the rolling feeding module 1 and the inspection station 3, and the second clamping, suspension, and translation mechanism 9 is located above the end inspection station 5, the angle adjustment station 6, and the re-inspection station 7. The first clamping, suspension, and translation mechanism 2 is used to lift and translate the bar stock on the rolling feeding module 1 to the inspection station 3, and the second clamping, suspension, and translation mechanism 9 is used to lift and translate the bar stock on the end inspection station 5, the angle adjustment station 6, and the re-inspection station 7.

[0035] Each of the inspection stations 3, circumferential inspection station 4, and end inspection station 5 is equipped with a set of clamping and flipping modules 8. The clamping and flipping modules 8 are used to clamp the slender bar material and flip it 180 degrees.

[0036] The circumferential detection module 10 is slidably disposed above the circumferential detection station 4. The end detection module 11 is disposed at the end of the end detection station 5. The re-inspection module 12 is slidably disposed above the re-inspection station 7 via a linear module, which is horizontally disposed on the detection platform 100.

[0037] The detection accuracy of the re-inspection module 12 is higher than that of the circumference detection module 10.

[0038] The online defect detection system for slender bars also includes a feeding unit, which includes a rolling feeding module 13.

[0039] The rolling feeding module 13 includes a plurality of support conveying units 300 arranged linearly at intervals along the left and right directions.

[0040] The rolling feeding module 13 is set flush with the angle adjustment station 6.

[0041] When the rolling feeding module 13 is set flush with the angle adjustment station 6, the support platform 200 of the angle adjustment station 6 located above the detection platform 100 and the support conveying unit 300 of the rolling feeding module 13 are arranged alternately.

[0042] like Figure 2 and Figure 5 and Figure 6 As shown, the circumference detection module 10 includes a 3D camera detection unit 101 and a line scan camera detection unit 102.

[0043] In this embodiment, a line scan camera measures defects in the bar stock along a 180° circumference, such as scratches and dents; a 3D camera measures the bar stock's diameter, straightness, and the depth of scratches. The line scan camera scans images, and deep learning algorithms are used to identify dents, pits, grooves, and scratches. Specifically, the grayscale images from the line scan camera are used for defect analysis of tool marks and scratches; the 3D thermal images from the 3D camera are used for color analysis of defects caused by height.

[0044] The 3D camera detection unit 101 includes two or more 3D cameras 400 spaced apart along the circumference of the slender bar. Preferably, the 3D cameras 400 are integrated and fixedly disposed in the same housing. In this embodiment, one 3D camera detection unit 101 is equivalent to three 3D cameras simultaneously photographing the same segment of the workpiece surface, each photographing a 60° angle of the surface (actually greater than 60°).

[0045] The linear array camera detection unit 102 includes two or more linear array cameras 500 spaced apart along the circumferential direction of the slender bar. For example... Figure 5 As shown. In this embodiment, three line scan cameras can be set up, and the three line scan cameras simultaneously photograph the same section of the surface of the bar stock, each photographing a 60° angle of the surface.

[0046] Two or more circumferential inspection modules 10 are arranged above each circumferential inspection station 4, and the circumferential inspection modules 10 are evenly spaced along the length direction of the slender bar. In this embodiment, as shown... Figure 4 As shown, two circumferential detection modules 10 are set above each circumferential detection station 4. Taking a fuel rod with a total length of 4.583 meters as an example, each circumferential detection module 10 is designed to detect 2.2915 meters, which can completely cover the length of the rod.

[0047] The circumference detection module 10 performs synchronous detection along the same direction.

[0048] In this embodiment, two adjacent circumferential detection modules 10 above the two circumferential detection stations 4 are set on the same sliding block for synchronous detection.

[0049] The end detection module 11 includes a 3D camera 400 and an area scan camera 600. The 3D camera acquires depth and width information over the entire area, while the area scan camera captures images over the entire area, such as identifying crater defects.

[0050] The 3D camera 400 and the area scan camera 600 are mounted on the detection platform 100 and can slide back and forth via a linear module.

[0051] The re-inspection module 12 includes a spectral confocal line sensor 700, a line array camera 500, and a lifting linear module 800. The spectral confocal line sensor 700 and the line array camera 500 are slidably mounted on the lifting linear module 800, and the lifting linear module 800 is slidably mounted on the detection platform 100 via the linear module.

[0052] like Figure 3 As shown, the clamping and flipping module 8 includes a rotating shaft 81, a plurality of gripper modules 82 spaced apart on the rotating shaft 81, and a rotation drive module that drives the rotating shaft 81.

[0053] The gripper module 82 is located in the gap between two adjacent support platforms 200.

[0054] The online defect detection system for slender bars also includes a lifting module 14, which includes a plurality of lifting rods 141 arranged linearly at intervals, and the lifting rods 141 are located between two adjacent support platforms 200.

[0055] The upper end of the lifting rod 141 is provided with a V-groove. Specifically, the lifting module 14 adopts a precision cylinder with a guide, which can effectively avoid axial sway of the cylinder. The connecting part at the upper end of the cylinder shaft adopts a V-groove design. In addition, since the length of the bar is relatively long, multiple lifting cylinders are used to lift the bar, which can prevent the bar from rotating in the V-groove.

[0056] When moving bar stock from one workstation to the next, it must first be lifted by the lifting module before being moved to the next workstation. The purpose is to minimize surface damage to the bar stock, such as friction between the bar stock and the lifting structure.

[0057] The first clamping suspension translation mechanism 2 and the second clamping suspension translation mechanism 9 include two spaced-apart front-to-back translation linear modules 900 and a clamping unit disposed on the front-to-back translation linear modules 900.

[0058] The clamping unit includes a lifting mechanism and a clamping mechanism. The lifting mechanism is slidably mounted on the forward and backward translational linear module 900, and the clamping mechanism is located at the lower end of the lifting mechanism. The lifting mechanism can be a lifting rod or a linear module, and the clamping mechanism uses flexible grippers and can be hydraulically or electrically driven.

[0059] The online defect detection system for slender bars also includes a non-conforming product platform 15 and a buffer platform 16 set between the angle adjustment station 6 and the re-inspection station 7.

[0060] The non-conforming product platform 15 and the buffer platform 16 are both located below the second clamping, suspension and translation mechanism 9.

[0061] The non-conforming product platform 15 is located in front of the inspection platform 100. The non-conforming product platform 15 includes a baffle and an inclined platform, which enables the bar stock to automatically align neatly under the action of gravity.

[0062] The buffer platform 16 is provided with multiple storage slots 161 arranged in parallel.

[0063] The online defect detection system for slender bars also includes a purging device 17.

[0064] The purging device 17 is located above the support conveyor unit 300 corresponding to the rolling feeding module 1.

[0065] The purging device 17 is slidably mounted above the support conveying unit 300 via a linear module, which is horizontally mounted on the detection platform 100. The purging device 17 moves horizontally left and right relative to the bar stock. The function of the purging device 17 is to use high-pressure gas to purge residues and foreign objects from the surface of the bar stock. Because the bar stock is relatively long, the purging device must move horizontally left and right relative to the bar stock to ensure that the entire length of the bar stock is cleaned.

[0066] Workflow introduction: 1) Complete testing process for a single rod: The workpiece is transferred from the side by the rolling feeding module 1, and the surface is blown at the same time. The workpiece to be inspected is moved to the inspection station 3. After rotating and being identified by number at the inspection station 3, it waits for feeding.

[0067] When the first circumferential inspection station 4 is idle, the workpiece is moved parallel to the first circumferential inspection station 4 by the moving component, and then 4 sets of circumferential inspection modules 10 are moved to perform a 180-degree scan.

[0068] After the first circumferential inspection station 4 is completed, the workpiece is moved to the second circumferential inspection station 4 (while being rotated 180°) for another 180-degree scan.

[0069] After the second circumferential inspection station 4 is completed, the workpiece is moved to the end inspection station 5 for two end scans.

[0070] After the end inspection station 5 completes the inspection, the workpiece is moved to the clamping and flipping module 8. If there are scratches or dents detected by the line scan camera, but the 3D camera does not detect any abnormalities or may detect abnormalities (such as critical defect size or misjudging foreign objects as scratches), the scratches or dents are rotated to a suitable angle at this station and then moved to the re-inspection station 7 for re-inspection. If there are no such cases, re-inspection is not required, and the workpiece can be transported out of the inspection platform 100 by the rolling unloading module 13.

[0071] After the re-inspection station 7 completes the inspection, if no defects are found, the qualified products without defects are moved to the qualified material rack via the rolling unloading module 13; if defects are found, the unqualified products are moved to the unqualified product platform 15 using the second clamping suspension translation mechanism 9, and then moved to the unqualified material rack.

[0072] Example 2 like Figure 7 As shown, the difference from Embodiment 1 is that the rolling feeding module 13 is located on the front side of the detection platform 100.

[0073] When the rolling unloading module 13 is installed on the front side of the detection platform 100, the rolling unloading module 13 is located below the second clamping suspension translation mechanism 9.

Claims

1. An online defect detection system for slender bars, characterized in that: Includes a testing platform (100), a feeding unit, and a testing unit; The feeding unit includes a rolling feeding module (1) and a first clamping, suspension and translation mechanism (2); The detection unit includes a station to be inspected (3), a circumferential detection station (4), an end detection station (5), an angle adjustment station (6), a re-inspection station (7), a clamping and flipping module (8), a second clamping, suspension and translation mechanism (9), a circumferential detection module (10), an end detection module (11), and a re-inspection module (12). The inspection station (3), circumferential inspection station (4), end inspection station (5), angle adjustment station (6), and re-inspection station (7) all include multiple support platforms (200) arranged linearly at intervals along the left and right directions. The upper end of the support platform (200) is provided with a limiting groove (201). The limiting groove (201) is V-shaped. The circumferential inspection station (4) corresponds to a circumferential angle greater than 180 degrees on the circumferential surface of the slender bar material to be inspected in the limiting groove (201). The angle adjustment station (6) is equipped with a clamping and rotating mechanism at one end; The rolling feeding module (1) includes multiple support conveying units (300) arranged linearly at intervals along the left and right directions. The rolling feeding module (1) is located on the rear side of the detection platform (100). A station to be inspected (3), two circumferential detection stations (4), an end detection station (5), an angle adjustment station (6), and a re-inspection station (7) are arranged on the detection platform (100) from back to front relative to the rolling feeding module (1). The first clamping, suspension and translation mechanism (2) is located above the rolling feeding module (1) and the inspection station (3), and the second clamping, suspension and translation mechanism (9) is located above the end detection station (5), the angle adjustment station (6) and the re-inspection station (7); Each of the adjacent inspection stations (3), circumferential inspection stations (4), and end inspection stations (5) is provided with a set of clamping and flipping modules (8); The clamping and flipping module (8) is used to clamp the slender bar and flip it 180 degrees. The circumferential detection module (10) is slidably positioned above the circumferential detection station (4), the end detection module (11) is positioned at the end of the end detection station (5), and the re-inspection module (12) is slidably positioned above the re-inspection station (7). The detection accuracy of the re-inspection module (12) is higher than that of the circumference detection module (10).

2. The online defect detection system for slender bars according to claim 1, characterized in that: It also includes a feeding unit, which includes a rolling feeding module (13). The rolling feeding module (13) includes multiple support conveying units (300) arranged linearly at intervals along the left and right directions. The rolling feeding module (13) is set on the front side of the detection platform (100) or flush with the angle adjustment station (6); When the rolling feeding module (13) is set flush with the angle adjustment station (6), the support platform (200) of the angle adjustment station (6) located above the detection platform (100) and the support conveying unit (300) of the rolling feeding module (13) are arranged alternately. When the rolling feeding module (13) is set on the front side of the detection platform (100), the rolling feeding module (13) is located below the second clamping suspension translation mechanism (9).

3. The online defect detection system for slender bars according to claim 1, characterized in that: The circumference detection module (10) includes a 3D camera detection unit (101) and a line scan camera detection unit (102). The 3D camera detection unit (101) includes two or more 3D cameras (400) spaced apart along the circumference of the slender bar. The line scan camera detection unit (102) includes two or more line scan cameras (500) spaced apart along the circumferential direction of the slender bar. The 3D camera (400) is integrated and fixedly mounted in the same housing.

4. The online defect detection system for slender bars according to claim 1, characterized in that: Two or more circumferential detection modules (10) are set above each circumferential detection station (4), and the circumferential detection modules (10) are evenly spaced along the length of the slender bar. The circumferential detection module (10) performs synchronous detection in the same direction; Two adjacent circumferential detection modules (10) above the two circumferential detection stations (4) are set on the same sliding block for synchronous detection.

5. The online defect detection system for slender bars according to claim 1, characterized in that: The end detection module (11) includes a 3D camera (400) and an area array camera (600). The 3D camera (400) and the area array camera (600) are slidably mounted on the detection platform (100); The re-inspection module (12) includes a spectral confocal line sensor (700), a line array camera (500), and a lifting linear module (800). The spectral confocal line sensor (700) and the line array camera (500) are slidably mounted on the lifting linear module (800), and the lifting linear module (800) is slidably mounted on the detection platform (100).

6. The online defect detection system for slender bars according to claim 1, characterized in that: The clamping and flipping module (8) includes a rotating shaft (81), a plurality of gripper modules (82) spaced apart on the rotating shaft (81), and a rotation drive module that drives the rotating shaft (81); The gripper module (82) is located in the gap between two adjacent support platforms (200).

7. The online defect detection system for slender bars according to claim 1, characterized in that: It also includes a lifting module (14), which includes a plurality of lifting rods (141) arranged linearly at intervals, the lifting rods (141) being located between two adjacent support platforms (200); The upper end of the lifting rod (141) is provided with a V-shaped groove.

8. The online defect detection system for slender bars according to claim 1, characterized in that: The first clamping suspension translation mechanism (2) and the second clamping suspension translation mechanism (9) include two spaced-apart front and rear translation linear modules (900) and a clamping unit disposed on the front and rear translation linear modules (900); The clamping unit includes a lifting mechanism and a clamping mechanism. The lifting mechanism is slidably mounted on the front-to-back translational linear module (900), and the clamping mechanism is mounted at the lower end of the lifting mechanism.

9. The online defect detection system for slender bars according to claim 1, characterized in that: It also includes a non-conforming product platform (15) and a buffer platform (16) set between the angle adjustment station (6) and the re-inspection station (7). The non-conforming product platform (15) and the buffer platform (16) are both located below the second clamping suspension translation mechanism (9); The non-conforming product platform (15) is located in front of the testing platform (100); The buffer platform (16) is provided with multiple storage slots (161) arranged in parallel.

10. The online defect detection system for slender bars according to claim 1, characterized in that: It also includes a purging device (17); the purging device (17) is located above the rolling feeding module (1) corresponding to the support conveying unit (300); The purging device (17) is mounted above the support conveying unit (300) and can slide left and right via a linear module.

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