A deep hole large tooth high bolt hole thread defect scanning device

Abstract

The application discloses a kind of deep hole big tooth high bolt hole thread defect scanning devices, including video inspection pedestal, inspection pivot, planetary gear, servo motor, planet carrier, linear array optical scanning device and inner ring gear;Planetary gear is connected with planet carrier, and linear array optical scanning device is carried in planet carrier lower side, and several radial observation camera groups are installed on linear array optical scanning device, and radial observation camera group is distributed along vertical direction;Wherein, servo motor is connected with planetary gear, controls planetary gear rotation around inner ring gear, and then controls linear array optical scanning device to carry out annular scanning around thread hole.This device uses planetary gear inner rotation motion detection mode, can adjust two-dimensional vision detection platform according to actual working condition to obtain highest definition detection effect, completely solves the automation, continuousness, adaptable multi-working condition requirement of deep hole big tooth high bolt hole detection, realizes high-efficiency, precision, safe detection target.

Description

Technical Field

[0001] This invention relates to the field of thread defect detection technology, specifically to a device for scanning and inspecting thread defects in deep-hole, large-tooth bolt holes. Background Technology

[0002] In the design and manufacturing of large-scale engineering machinery, ultra-large equipment is generally equipped with a large number of deep, high-thread bolt holes for connecting components; in order to ensure equipment safety, it is necessary to inspect the bolt holes for defects.

[0003] Current bolt hole defect inspection methods primarily rely on manual labor, which is difficult to perform during equipment assembly. These methods are often carried out under harsh conditions, involve high radiation levels, and are inherently dangerous, making prolonged operation unsuitable. Commonly used eddy current and magnetic particle testing methods are contact-based, potentially contaminating bolt holes, causing secondary damage, and providing insufficiently intuitive and stable data. Some devices using area-array cameras for thread video inspection also produce images that are not clear enough, significantly affected by depth of field and corner distortion.

[0004] Therefore, we should design a thread defect detection device that mainly addresses issues such as automation of detection, adaptability to object spacing, and reliability of confined space architecture to meet the detection requirements. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention aims to provide a deep hole, large thread, high bolt hole thread defect scanning device to solve the problem that the images obtained by the existing inspection devices are not clear enough and are significantly affected by depth of field and edge distortion.

[0006] To address this, the present invention proposes a deep-hole, large-tooth, high-strength bolt hole thread defect scanning device, comprising a video inspection base, an inspection shaft, planetary gears, a servo motor, a planetary carrier, a linear optical scanning device, and an internal gear ring; the internal gear ring is connected and fixed to the video inspection base, the inspection shaft is installed at the center of the video inspection base and rotatably connected via a bearing, and the planetary carrier is connected to the lower end of the inspection shaft; the planetary gears are connected to the planetary carrier, and the linear optical scanning device is mounted below the planetary carrier, with several radial observation camera groups installed on the linear optical scanning device, the radial observation camera groups being distributed along the vertical direction; wherein, the servo motor is connected to the planetary gears, controlling the planetary gears to rotate around the internal gear ring, thereby controlling the linear optical scanning device to perform a circular scan around the threaded hole.

[0007] Furthermore, the linear optical scanning device is connected to the planetary carrier via a first sliding module; the sliding direction of the first sliding module coincides with the prism center direction of the radial observation camera group.

[0008] Furthermore, the first sliding module includes a second sliding member connected to the linear optical scanning device and a first sliding member connected to the planetary carrier.

[0009] Furthermore, the second sliding component is fixed to the linear optical scanning device by a lateral positioning plate and several set bolts.

[0010] Furthermore, the first sliding member and the second sliding member are slidably engaged and locked by a set bolt.

[0011] Furthermore, a second sliding module is provided between the linear optical scanning device and the planetary carrier; the second sliding module includes a movable slot block fixedly connected to the planetary carrier, the movable slot block being slidably engaged with the first sliding member; the sliding direction of the first sliding member is perpendicular to the lens orientation of the radial observation camera group.

[0012] Furthermore, the sliding direction of the first slider is perpendicular to the sliding direction of the second slider.

[0013] Furthermore, an axial observation camera is also installed on the planetary carrier, and the prism centerline of the axial observation camera is parallel to the axis of the video inspection base.

[0014] Furthermore, the upper end of the video inspection base is connected to an inspection base cover, and the inspection base cover fixes three lifting rings distributed in an equilateral triangle.

[0015] Furthermore, the edge surface of the video inspection base adopts a conical structure, which facilitates positioning with the center of the bolt holes.

[0016] The deep-hole, large-thread, high-strength bolt hole thread defect scanning device provided by this invention adopts a spatial stacked composite structure and a planetary gear internal rotation motion detection method. It can adjust the two-dimensional vision inspection platform according to the actual working conditions to obtain the highest clarity inspection effect. It completely solves the requirements of automation, continuous operation, and adaptability to multiple working conditions for the inspection of deep-hole, large-thread, high-strength bolt holes, and achieves the inspection goals of high efficiency, accuracy, and safety. In addition, this application overcomes the shortcomings of the prior art and provides a bolt hole thread defect inspection device that is integrated into a confined space and provides clear and automated inspection.

[0017] 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

[0018] 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:

[0019] Figure 1 This is a front view of the deep hole large thread high bolt hole thread defect scanning device of the present invention;

[0020] Figure 2 The isometric view of the deep hole large thread high bolt hole thread defect scanning device of the present invention Figure 1 ;

[0021] Figure 3 The isometric view of the deep hole large thread high bolt hole thread defect scanning device of the present invention Figure 2 ;

[0022] Explanation of reference numerals in the attached figures

[0023] 1. Lifting ring; 2. Inspection base cover; 3. Video inspection base; 4. Inspection shaft; 5. Planetary gear; 6. Servo motor; 7. Planetary carrier; 8. Linear array optical scanning device; 9. Moving slot block; 10. Sliding part one; 11. Sliding part two; 12. Internal gear ring; 13. Lateral positioning plate; 14. Radial observation camera group; 15. Axial observation camera. Detailed Implementation

[0024] 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.

[0025] like Figures 1-3 As shown, the deep hole large thread high bolt hole thread defect scanning device of the present invention includes: video inspection base 3, inspection shaft 4, planetary gear 5, servo motor 6, planetary carrier 7, linear array optical scanning device 8, internal gear ring 12, radial observation camera group 14 and axial observation camera 15.

[0026] The inspection shaft 4 is installed at the center of the video inspection base 3 and is rotatably connected by a bearing. The planetary carrier 7 is fixedly connected to the lower end of the inspection shaft 4. The servo motor 6 is fixedly installed on the planetary carrier 7, and the planetary gear 5 is movably installed on the planetary carrier 7 and is connected to the servo motor 6 for transmission. The internal gear ring 12 is fixedly connected to the bottom of the video inspection base 3 and meshes with the planetary gear 5.

[0027] A linear optical scanning device 8 is mounted below the planetary carrier 7, and several radial observation camera groups 14 are mounted on the linear optical scanning device 8 and distributed vertically. A servo motor 6 drives the planetary gear 5 to rotate within the internal gear ring 12, thereby rotating the planetary carrier 7; further, it drives the several radial observation camera groups 14 to rotate in a ring, achieving a ring scan of deep, high-thread bolt holes. The servo motor 6 is a high-ratio servo motor, which has better deceleration performance, more stable power output, and smoother speed, thus facilitating the acquisition of clearer scan images.

[0028] Specifically, such as Figure 2 As shown, the linear optical scanning device 8 and the planetary carrier 7 are connected by a first sliding module. The first sliding module includes a second sliding member 11 connected to the linear optical scanning device 8 and a first sliding member 10 connected to the planetary carrier 7. The second sliding member 11 is fixed to the linear optical scanning device 8 by a lateral positioning plate 13 and several set bolts. The first sliding member 10 and the second sliding member 11 are slidably engaged and locked by set bolts.

[0029] The sliding direction of the second slider 11 coincides with the prism center direction of the radial observation camera group 14. By moving the second slider 11, the radial position of the linear array optical scanning device 8 can be adjusted to maintain a suitable distance from the arc surface of the deep hole large thread high bolt hole, so that the object distance of the radial observation camera group 14 is in a position with clear imaging.

[0030] like Figure 2 As shown, a second sliding module is also provided between the linear optical scanning device 8 and the planetary carrier 7. The second sliding module also includes a movable slot block 9 fixedly connected to the planetary carrier 7. The movable slot block 9 slides in cooperation with the sliding member 10. The sliding direction of the sliding member 11 is perpendicular to the sliding direction of the sliding member 10. At the same time, it is perpendicular to the lens orientation of the radial observation camera group 14. By adjusting the position of the sliding member 10, deviations during installation are prevented, so that the neutral axis of the radial observation camera group 14 intersects with the central axis of the video inspection base 3. Furthermore, the prism center of the radial observation camera group 14 coincides with the radial direction, and at the same time, it always maintains a perpendicular angle with the arc surface of the deep hole high-thread bolt hole.

[0031] like Figure 3 As shown, the planetary carrier 7 is also equipped with an axial observation camera 15; the prism center line of the axial observation camera 15 is parallel to the axis of the video inspection base 3. The axial observation camera 15 can observe the overall inspection position and condition of the threaded hole, which facilitates manual inspection and positioning of defects based on CCD inspection data.

[0032] like Figure 1 As shown, for ease of installation and lifting, the upper end of the video inspection base 3 is connected to an inspection base cover 2, which fixes three lifting rings 1 arranged in an equilateral triangle. These rings can be connected to three hooks on the crane to ensure the horizontality of the lifting and prevent the inspection equipment from tilting, shaking, or rotating. At the same time, the three lifting lugs design provides better load-bearing capacity and greater stability when mounting heavy optical inspection modules. The irregular movement amplitude caused by external interference is smaller, and the probability of hitting the wall during lifting and lowering is lower.

[0033] Furthermore, the edge surface of the video inspection base 3 adopts a conical structure, which facilitates positioning with the center of the bolt hole. This design addresses the issue that the crane may not be able to accurately keep the central axis of the inspection device coaxial with the thread during product hoisting. This design reduces rigid collisions between the product and the inner wall of the bolt hole when there is a deviation in the axial position, allowing the device to accurately enter the bolt hole. Moreover, the minimum cross-sectional circle diameter of its conical surface is larger than the enveloping cylinder diameter of the detection element, thus protecting the inspection device.

[0034] The working principle and process of the deep hole large thread high bolt hole thread defect scanning device of the present invention are briefly described below with reference to the accompanying drawings.

[0035] In the deep hole large thread high bolt hole thread defect scanning device of the present invention, the internal gear ring 12 is connected and fixed to the video inspection base 3, the planetary gear 5 is connected to the planet carrier 7, the planet carrier 7 is equipped with a linear array optical scanning device, the servo motor is connected to the planetary gear, controls the rotation of the planetary gear, and then controls the optical scanning device to scan around the thread hole.

[0036] When the present invention is working, firstly, the position of the sliding component 10 of the sliding module is adjusted according to the hole diameter and centering position of the bolt hole being detected, so that the prism center of the radial observation camera group 14 coincides with the radial direction. Then, the sliding component 11 of the sliding module is adjusted according to the optimal object distance requirement, so that the object distance of the radial observation camera group 14 is in a position with clear imaging.

[0037] After adjustment, a crane is used to connect to the lifting ring 1 of the defect scanning device, and the inspection device is lifted to directly above the bolt hole. The crane is then controlled to move the inspection device vertically downward until the first step surface of the video inspection base coincides with the upper end surface of the bolt hole. At this time, the inspection device is in the initial inspection position.

[0038] After the linear CCD scanning system and LED optical inspection system, which are connected to the radial observation camera group 14, are powered on, the scanning device records the initial scanning position as the initial position 0. Given the pulse signal corresponding to the servo motor 6, the servo motor drives the planetary gear 5 to rotate, forming an internal meshing engagement with the internal gear ring 12. With the internal gear ring 12 fixed, it drives the planetary carrier 7 to rotate, thereby realizing the rotational scanning motion of the scanning element and acquiring a clear scanning image. During the inspection process, the thread hole defects can be inspected and identified in real time through the display screen and with the help of the radial observation camera group 14, the location of suspicious defect points can be located, and the operation status of the inspection device inside the hole can be monitored through the axial observation camera 15.

[0039] In addition to the aforementioned beneficial effects, the present invention has the following advantages compared to the prior art:

[0040] 1. This invention employs a single-stage planetary gear transmission for the rotary scanning motion. The internal gear ring is fixedly connected to the video inspection base. The planetary gears are connected to a planetary carrier, which houses a linear optical scanning device. A servo motor is connected to the planetary gears, controlling their rotation and thus controlling the optical scanning device to scan around the threaded hole. This transmission structure saves space and facilitates high stability, a large transmission ratio, uniform torque distribution, and high-precision motion control within confined spaces.

[0041] 2. This invention employs a two-dimensional sliding adjustable vision platform, using a T-slot and straight slot connection method. The T-slot guides the vertical detection direction, allowing the sliding member 10 to slide within it. Once in the desired position, the position can be locked by tightening the set screws, facilitating adjustment of the mounting vision scanning device's alignment for thread scanning. The straight slot guides the detection direction, allowing the sliding member 2 to slide under the guidance of the side stepped surface. Once in the desired position, the position is locked by double set screws, enabling adjustment of the detection distance. This allows the vision scanning device to determine the optimal detection distance based on the type and diameter of different bolt holes, obtaining a clear detection image.

[0042] 3. This invention uses a linear CCD as the photosensitive element for visual inspection. For bolt holes with large curvature, ordinary area array cameras have the thread furthest from the center of the camera and the closest point to the thread at the corners, resulting in an excessive depth of field that is difficult for ordinary cameras to adapt to. Furthermore, ordinary area array cameras are prone to image distortion at the corners. The linear CCD can collect vertical images with equal object distances and stitch them together to obtain a clear thread development diagram with consistent depth of field, which facilitates the observation of defects and accurate determination of defect types by the staff.

[0043] 4. The present invention adopts a real-time camera combination observation system. The radial observation camera group 14 can transmit the real-time situation of thread scanning at various depths, expand the inspection range, perform image fusion processing on the real-time images, and transmit the latest images at high speed. The axial observation camera 15 can observe the overall inspection position and condition of the threaded hole, which facilitates manual quick defect review and positioning based on CCD inspection data.

[0044] 5. The edge surface of the inspection base of the present invention adopts a conical shape, which is designed to address the issue that the crane cannot accurately keep the central axis of the inspection device coaxial with the thread when the product is being hoisted. This design helps to reduce rigid collisions between the product and the inner wall of the bolt hole when there is a deviation in the axial position, allowing the device to accurately enter the bolt hole. Furthermore, the minimum cross-sectional circle diameter of the conical surface is larger than the enveloping cylinder diameter of the detection element, which can protect the inspection device.

[0045] 6. This product features three lifting rings arranged in an equilateral triangle on the top of the inspection base cover. These rings can be connected to three hooks on the crane, ensuring the horizontality of the lifting and preventing the inspection equipment from tilting, shaking, or rotating. At the same time, the three lifting lugs design provides better load-bearing capacity and greater stability when carrying heavy optical inspection modules. The product also exhibits less irregular movement under external interference and a lower probability of hitting walls during lifting and lowering.

[0046] 7. This invention uses a large transmission ratio servo motor 6, which has better deceleration performance, more stable power output, and smoother speed, which is conducive to obtaining clearer scanning images.

[0047] 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 device for inspecting thread defects in deep-hole, large-tooth bolt holes, characterized in that, It includes a video inspection base (3), an inspection shaft (4), a planetary gear (5), a servo motor (6), a planetary carrier (7), a linear optical scanning device (8), and an internal gear ring (12); The internal gear ring (12) is connected and fixed to the video inspection base (3), the inspection shaft (4) is installed at the center of the video inspection base (3) and is rotatably connected by a bearing, and the planetary carrier (7) is connected to the lower end of the inspection shaft (4). The planetary gear (5) is connected to the planet carrier (7). The linear array optical scanning device (8) is mounted below the planet carrier (7). Several radial observation camera groups (14) are installed on the linear array optical scanning device (8). The radial observation camera groups (14) are distributed along the vertical direction. The servo motor (6) is connected to the planetary gear (5) to control the planetary gear (5) to rotate around the internal gear ring (12), thereby controlling the linear optical scanning device (8) to perform a circular scan around the threaded hole. The linear optical scanning device (8) is connected to the planetary carrier (7) via a first sliding module; the sliding direction of the first sliding module coincides with the prism center direction of the radial observation camera group (14); the first sliding module includes a second sliding member (11) connected to the linear optical scanning device (8) and a first sliding member (10) connected to the planetary carrier (7). A second sliding module is provided between the linear optical scanning device (8) and the planetary carrier (7); the second sliding module includes a movable slot block (9) fixedly connected to the planetary carrier (7), the movable slot block (9) and the sliding member (10) are slidably engaged; the sliding direction of the sliding member (10) is perpendicular to the lens orientation of the radial observation camera group (14).

2. The deep-hole, high-thread-ratio bolt hole thread defect inspection device according to claim 1, characterized in that, The sliding member 2 (11) is fixed to the linear optical scanning device (8) by a lateral positioning plate (13) and several set bolts.

3. The deep-hole, high-thread-ratio bolt hole thread defect inspection device according to claim 1, characterized in that, The first sliding member (10) and the second sliding member (11) slide together and are locked by a set bolt.

4. The deep-hole, high-thread-ratio bolt hole thread defect inspection device according to claim 1, characterized in that, The sliding direction of the first slider (10) is perpendicular to the sliding direction of the second slider (11).

5. The deep-hole, high-thread-ratio bolt hole thread defect inspection device according to claim 1, characterized in that, An axial observation camera (15) is also installed on the planetary carrier (7), and the prism center line of the axial observation camera (15) is parallel to the axis of the video inspection base (3).

6. The deep-hole, high-thread-ratio bolt hole thread defect inspection device according to claim 1, characterized in that, The upper end of the video inspection base (3) is connected to an inspection base cover (2), and the inspection base cover (2) is fixed with three hanging rings (1) arranged in an equilateral triangle.

7. The deep-hole, high-thread-ratio bolt hole thread defect inspection device according to claim 1, characterized in that, The edge surface of the video inspection base (3) adopts a conical structure, which facilitates positioning with the center of the bolt hole.

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