A device for measuring the size of a part and detecting defects
By integrating a vision industrial camera and a sensor triggering module on the conveyor, part size measurement and defect detection can be achieved at a single workstation, solving the problem of extended detection time in existing technologies and improving production efficiency and intelligent manufacturing level.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI INST OF INT TRADE & COMMERCE
- Filing Date
- 2025-07-09
- Publication Date
- 2026-07-14
AI Technical Summary
Existing machine vision-based parts inspection devices separate defect detection from dimensional measurement, resulting in longer inspection times and failing to meet the needs of automated production.
A part size measurement and defect detection device was designed. By integrating a vision industrial camera, a conveyor, a fine-tuning bracket, a dual-sensor triggering module and a vision computer, the device can complete part size measurement and defect detection at a single workstation. Image acquisition is triggered by Hall effect switches and laser beam sensors, reducing transmission paths and repetitive acquisition time.
It significantly shortens inspection time, improves production efficiency, reduces parts inspection costs, and promotes the improvement of intelligent manufacturing level.
Smart Images
Figure CN224499390U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of part measurement and inspection equipment, concretely relates to a part size measurement and defect detection device. BACKGROUND
[0002] Part measurement and inspection is an indispensable link in the automatic production and manufacturing process, the traditional method generally carries out artificial sampling inspection through visual and measuring tool, has slow measurement and inspection speed, is greatly influenced by human factors and the like defects, cannot satisfy the demand of large-scale automatic production and manufacturing.
[0003] Introducing machine vision technology into part measurement and inspection can realize non-contact high-precision measurement and automatic inspection, can avoid human error in the measurement and inspection process, can realize rapid and continuous measurement and inspection, and can effectively guarantee the automation of the production and manufacturing process. But the existing part detection device based on machine vision separates the defect detection and size measurement, so that the measured part needs to flow through two stations in turn, which increases the detection time due to the lengthening of the transmission path and repeated image acquisition. UTILITY MODEL CONTENT
[0004] In order to solve the above problems in the prior art, the utility model provides a part size measurement and defect detection device. The technical problem to be solved by the utility model is realized through the following technical scheme:
[0005] This utility model provides a part size measurement and defect detection device, including: a conveyor table, a fine-tuning bracket, a vision industrial camera, a ring-shaped LED light source, a dual-sensor triggering module, and a vision computer; the fine-tuning bracket is fixed to one side of the conveyor table, and the vision industrial camera is suspended on the fine-tuning bracket; the conveyor table is located below the vision industrial camera, and the dual-sensor triggering module is disposed on the conveyor table; the lower part of the vision industrial camera is connected to a telecentric lens via a thread, and a ring-shaped LED light source is disposed below the telecentric lens, and the ring-shaped LED light source is suspended on the fine-tuning bracket; the area on the conveyor table below the vision computer is set as a vision detection area, and strip-shaped LED light sources are disposed opposite each other on both sides of the conveyor table near the vision detection area; the dual-sensor triggering module includes... The system comprises a laser emitter, a laser receiver, and a Hall effect sensor switch. The laser emitter and the laser receiver are positioned opposite each other on opposite sides of a conveyor platform, and the Hall effect sensor switch is located on one edge of the conveyor platform. The conveyor belt of the platform is equipped with a starting positioning magnetic block and a calibration checkerboard pattern. A vision computer is electrically connected to both a vision industrial camera and a dual-sensor trigger module. When the part under test is placed on the conveyor belt, and the part under test obstructs the laser receiver, the vision industrial camera is triggered to acquire an image of the part under test. When the starting positioning magnetic block approaches the Hall effect sensor switch, the vision industrial camera is triggered to acquire an image of the calibration checkerboard pattern to calibrate the camera's size ratio. The vision computer performs dimensional measurements and defect detection based on the image of the part under test and the calibrated camera size ratio.
[0006] In one embodiment of this utility model, the fine-tuning bracket includes: a vertical support rod, a fine-tuning camera clip, and a sliding light source bracket. The fine-tuning camera clip is sleeved on the vertical support rod, and its position relative to the vertical support rod is adjusted by an adjusting member. The fine-tuning camera clip is used to fix the industrial vision camera. The sliding light source bracket is sleeved on the vertical support rod and slides relative to the vertical support rod. The sliding light source bracket is locked to the vertical support rod by a locking member, and the sliding light source bracket is used to fix the annular LED light source.
[0007] In one embodiment of this utility model, the adjusting component includes a focus adjustment handwheel, which is used to adjust the position of the fine-tuning camera clamp along the axial direction of the vertical support rod, so that the vision industrial camera focuses on the surface of the part under test or the calibration checkerboard.
[0008] In one embodiment of this utility model, the laser emitter, the laser receiver, and the Hall effect sensor switch are electrically connected to the sensor junction box, and the sensor junction box is connected to the vision computer through an I / O interface board.
[0009] In one embodiment of this utility model, the vision computer integrates a main processor board and a graphics card. The main processor board is used for size measurement, and the graphics card is used for defect detection.
[0010] In one embodiment of this utility model, the part size measurement and defect detection device further includes: a dual-channel adjustable power supply module, which supplies power to the laser emitter, the laser receiver, the Hall effect sensor switch and the ring-shaped LED light source respectively through the sensor junction box.
[0011] In one embodiment of this utility model, the part size measurement and defect detection device further includes: a touch screen, which is electrically connected to the vision computer and is used to display the size measurement and defect detection results of the part being measured.
[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0013] This invention relates to a part size measurement and defect detection device. A vision industrial camera is integrated onto a conveyor platform via a fine-tuning bracket. The conveyor platform is equipped with a conveyor belt and an integrated dual-sensor trigger module. The Hall effect switch in the dual-sensor trigger module senses the initial positioning magnetic block, triggering the vision industrial camera to acquire an image of a calibration checkerboard pattern to calibrate the camera's size proportions. When the part being measured obstructs the laser beam sensor, the laser beam sensor in the dual-sensor trigger module triggers the vision industrial camera to acquire an image of the part. Through structural integration, especially for the conveyor platform and the sensor-based motion triggering system, calibration and image acquisition based on the vision industrial camera can be completed at a single station with automatic trigger detection. This allows for subsequent vision computer processing for size measurement and defect detection, reducing the time required for the part to travel through two stations and for repeated image acquisition in traditional solutions, significantly shortening the inspection time.
[0014] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of a part size measurement and defect detection device provided in an embodiment of the present invention.
[0016] Reference numerals: 1-Conveyor table; 101-Conveyor belt; 102-Calibration checkerboard; 103-Starting positioning magnetic block; 104-Strip LED light source; 2-Fine-tuning bracket; 201-Vertical support rod; 202-Fine-tuning camera clamp; 2021-Focus adjustment handwheel; 203-Sliding light source bracket; 3-Vision industrial camera; 301-Telecentric lens; 4-Dual sensor trigger module; 401-Laser emitter; 402-Laser receiver; 403-Hall effect sensor switch; 5-Vision computer; 501-I / O interface board; 502-Main processor board; 503-Graphics card; 6-Ring LED light source; 7-Sensor junction box; 8-Dual-channel adjustable power supply module; 9-Touch display screen; 10-Part under test. Detailed Implementation
[0017] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following detailed description of a part size measurement and defect detection device based on this utility model is provided in conjunction with the accompanying drawings and specific embodiments.
[0018] The foregoing and other technical contents, features, and effects of this utility model will be clearly presented in the following detailed description of the specific embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding can be gained of the technical means and effects adopted by this utility model to achieve the intended purpose. However, the accompanying drawings are only provided for reference and illustration and are not intended to limit the technical solution of this utility model.
[0019] Example 1
[0020] Existing machine vision-based parts inspection production lines require defect detection equipment and dimensional measurement equipment to be placed at two separate workstations to meet parts quality inspection requirements. However, this dual-workstation setup for defect detection and dimensional measurement leads to equipment redundancy and prolongs the inspection cycle. Therefore, this embodiment provides a parts dimensional measurement and defect detection device, such as... Figure 1 As shown, Figure 1 This is a schematic diagram of a part size measurement and defect detection device provided in an embodiment of the present invention.
[0021] In this embodiment, the part size measurement and defect detection device includes: a conveyor 1, a fine-tuning bracket 2, a vision industrial camera 3, a dual-sensor triggering module 4, and a vision computer 5.
[0022] Specifically, the fine-tuning bracket 2 is fixed to one side of the conveyor platform 1, and the vision industrial camera 3 is suspended on the fine-tuning bracket 2; the conveyor platform 1 is located below the vision industrial camera 3, and the dual-sensor triggering module 4 is set on the conveyor platform 1; the dual-sensor triggering module 4 includes a laser emitter 401, a laser receiver 402, and a Hall effect sensor switch 403, with the laser emitter 401 and laser receiver 402 arranged opposite each other on both sides of the conveyor platform 1, and the Hall effect sensor switch 403 set on one edge of the conveyor platform 1; the conveyor belt 101 of the conveyor platform 1 is provided with a calibration checkerboard 102 and a starting positioning magnetic block 103; the vision computer 5 is electrically connected to the vision industrial camera 3 and the dual-sensor triggering module 4 respectively.
[0023] In one optional embodiment, the lower part of the vision industrial camera 3 is connected to the telecentric lens 301 via a thread. A ring-shaped LED light source 6 is disposed below the vision industrial camera 3 and is suspended on the fine-tuning bracket 2, that is, the ring-shaped LED light source 6 is located directly above the conveyor table 1. The area on the conveyor table 1 located below the vision industrial computer 3 is designated as the vision inspection area, and strip-shaped LED light sources 104 are disposed opposite each other on both sides of the conveyor table 1 near the vision inspection area.
[0024] Preferably, the vision industrial camera 3 is a 12-bit precision monochrome CCD camera with a resolution higher than 1296*964, the telecentric lens 301 is a fixed focal length object telecentric lens with parallel light output, very small distortion, and large depth of field, and the ring LED light source 6 adopts a long-life, stable, and low-cost red LED light source to enhance the edge of the part, improve the contrast of the image, and improve the accuracy of part defect detection and dimensional measurement.
[0025] In one optional embodiment, the fine-tuning bracket 2 includes: a vertical support rod 201, a fine-tuning camera clip 202, and a sliding light source bracket 203. The fine-tuning camera clip 202 is sleeved on the vertical support rod 201, and its position relative to the vertical support rod 201 is adjusted by an adjusting member. The fine-tuning camera clip 202 is used to fix the vision industrial camera 3. The sliding light source bracket 203 is sleeved on the vertical support rod 201 and slides relative to the vertical support rod 201. The sliding light source bracket 203 is locked to the vertical support rod 201 by a locking member. The sliding light source bracket 203 is used to fix the annular LED light source 6.
[0026] For example, the adjustment component includes a focus adjustment handwheel 2021, which is used to adjust the position of the fine-tuning camera clamp 202 along the axial direction of the vertical support rod 201, so that the vision industrial camera 3 focuses on the surface of the part under test 10 or the calibration checkerboard 102. The focus adjustment handwheel 2021 can precisely adjust the vertical position of the fine-tuning camera clamp 202 along the vertical support rod 201 within a range of ±30mm, so that the vision industrial camera 3 can accurately focus to acquire high-definition images of the part under test 10 and the calibration checkerboard 102, thereby ensuring the accuracy of dimensional measurement and defect detection of the part under test 10. Preferably, the focus adjustment handwheel 2021 can be driven by a rotating motor or by a manual crank to adjust the position of the fine-tuning camera clamp 202 along the axial direction of the vertical support rod 201.
[0027] For example, the locking element can be a snap-fit or a sleeve that is locked by a screw.
[0028] The principle is that the fine-tuning bracket 2 is set on one side edge of the conveyor table 1 along the conveying direction of the conveyor belt 101, and the vision industrial camera 3 and the ring-shaped LED light source 6 are both suspended on the fine-tuning bracket 2; the laser emitter 401 is set opposite to the laser receiver 402 on both sides along the conveying direction of the conveyor belt 101, the starting positioning magnetic block 103 is fixed on the conveyor belt 101, the Hall sensor switch 403 is set on one side edge of the conveyor table 1 along the conveying direction of the conveyor belt 101, and the calibration checkerboard 102 is printed or pasted on one end of the conveyor belt 101, and the conveyor belt 101 can rotate periodically along a fixed running direction. The part 10 under test is placed on the conveyor belt 101 and moves with it. When the part 10 blocks the laser receiver 402, the vision industrial camera 3 is triggered to acquire an image of the part 10. When the starting positioning magnetic block 103 approaches the Hall sensor switch 403, the vision industrial camera 3 is triggered to acquire an image of the calibration checkerboard 102 to calibrate the camera size ratio. Specifically, the vision industrial camera 3 acquires an image of the calibration checkerboard 102, and then uses the checkerboard calibration method to calibrate the ratio of the camera's optical pixel resolution to its physical size, thereby calibrating the camera size ratio. The vision computer 5 performs size measurement and defect detection based on the image of the part 10 under test and the calibrated camera size ratio. Thus, through the conveyor belt 101 and the dual sensor triggering module 4, camera calibration, size measurement, and defect detection can be achieved at the same station. This allows the part size measurement and defect detection device of this embodiment to be used in automated production lines for industrial manufacturing, improving production efficiency and reducing part inspection costs, which is conducive to promoting the improvement of intelligent manufacturing level. Understandably, in order to avoid interference from the starting positioning magnetic block 103 to the laser receiver 402, the starting positioning magnetic block 103 can be fixed in the non-detection area of the conveyor belt 101, that is, the part to be tested 10 is placed on the conveyor belt 101 and located outside the non-detection area, so that the part to be tested 10 and the starting positioning magnetic block 103 are misaligned in both space and time by the operation of the conveyor belt 101.
[0029] It is worth noting that the part size measurement and defect detection device of this utility model integrates the visual industrial camera 3 onto the conveyor table 1 via a fine-tuning bracket 2. Simultaneously, the conveyor table 1 is equipped with a conveyor belt 101 and integrates a dual-sensor trigger module 4. The Hall effect sensor switch 403 in the dual-sensor trigger module 4 senses the initial positioning magnetic block 103 based on the Hall effect principle, thereby triggering the visual industrial camera 3 to acquire images of the calibration checkerboard 102 to calibrate the camera size ratio. When the part under test 10 blocks the laser beam sensor, the laser beam sensor in the dual-sensor trigger module 4 triggers the visual industrial camera 3 to acquire images of the part under test 10. Through the integration of the structure, especially the conveyor table 1 and the sensor-based motion triggering settings, the calibration of the visual industrial camera 3 and the image acquisition of the part under test 10 can be completed at a single station, and the trigger can be automatically detected. This allows it to be used for subsequent size measurement and defect detection processing by the visual computer 5, reducing the time required for the part under test 10 to flow through two stations and repeatedly acquire images in traditional solutions, significantly shortening the detection time.
[0030] In an optional implementation, the vision computer 5 integrates a main processor board 502 (Central Processing Unit, CPU) and a graphics processing unit (GPU) 503. The main processor board 502 is used for dimensional measurement, and the graphics card 503 is used for defect detection. A laser emitter 401, a laser receiver 402, and a Hall effect sensor switch 403 are electrically connected to a sensor junction box 7. The sensor junction box 7 is connected to the vision computer 5 via an I / O interface board 501. The sensor junction box 7 is also electrically connected to a vision industrial camera 3. The vision industrial camera 3 is connected to the main processor board 502 of the vision computer 5 via a USB cable (Universal Serial Bus) or a PoE cable (Power over Ethernet). The vision industrial camera 3 inputs the acquired digital images into the vision computer 5.
[0031] For example, the main processor board 502 is internally configured with: a high-performance multi-core CPU with a main frequency of not less than 2.5GHz, 8GB DDR4 memory, 256GB solid-state drive, and 2 Gigabit Ethernet ports. The I / O interface board 501 has an 8-channel digital I / O interface and is connected to the main processor board 502 through a PCIe slot. The graphics card 503 has a tensor computing capability of not less than 60TFLOPS and is equipped with not less than 8GB of video memory. The graphics card 503 is connected to the main processor board 502 through a PCIe-X16 slot.
[0032] In an optional embodiment, the part size measurement and defect detection device further includes a dual-channel adjustable power supply module 8, which supplies power to the laser emitter 401, laser receiver 402, Hall effect sensor switch 403, and ring LED light source 6 via a sensor junction box 7. For example, one channel of the dual-channel adjustable power supply module 8 outputs 0-24V to power the ring LED light source 6, and by adjusting the voltage output of the dual-channel adjustable power supply module 8, the illumination intensity of the ring LED light source 6 can be changed to achieve uniform illumination of the part under test 10, reducing the influence of external light and facilitating the acquisition of clear, low-noise images by the vision industrial camera 3. The other channel outputs +24V to power the sensor junction box 7, which in turn supplies +24V to the laser emitter 401, laser receiver 402, and Hall effect sensor switch 403.
[0033] It is worth noting that the part size measurement and defect detection device in this embodiment requires optimization of lighting conditions to improve image quality in order to complete the calibration and image acquisition of the industrial vision camera 3 at the same single workstation, thus supporting the industrial vision camera 3 to perform dual tasks at the same workstation. Specifically, the annular LED light source 6 is suspended on the fine-tuning bracket 2, located directly below the industrial vision camera 3. This position design allows the light source to directly cover the entire visual inspection area, namely the part placement area on the conveyor belt 101. The annular structure of the annular LED light source 6 provides 360° illumination, which can eliminate edge shadows and avoid measurement errors caused by shadows distorting the part contours, making edge detection more accurate when inspecting the shape and size of parts. At the same time, uniform illumination can also enhance image contrast, making it easier to identify micro-cracks or scratches during defect detection. In addition, the illumination intensity of the annular LED light source 6 can be adjusted by adjusting the voltage output of the dual-channel adjustable power supply module 8, thereby dynamically controlling the illumination intensity to adapt to different part materials or changes in ambient light, and enhancing the resistance to external light interference.
[0034] Furthermore, the strip LED light sources 104 are arranged symmetrically on both sides of the visual inspection area, i.e., symmetrically arranged on both sides of the conveyor belt 101. When the part under test 10 moves on the conveyor belt 101, the strip LED light sources 104 provide lateral illumination, which can compensate for the potential blind spots of the ring LED light source 6, reduce local overbrightness or underbrightness of the image, and solve the problem of insufficient illumination in the edge areas, which is more important in the identification of surface defects (such as scratches or dents). This ensures consistent illumination throughout the visual inspection area and improves the reliability of defect detection. Specifically, since the strip LED light sources 104 are arranged parallel to the conveying direction of the part under test 10, the strip LED light sources 104 maintain illumination stability during continuous inspection, avoiding illumination fluctuations caused by the movement of the part under test 10, thereby supporting automatic inspection, reducing inspection time, and improving production efficiency.
[0035] In an optional embodiment, the part size measurement and defect detection device further includes a touch screen 9, which is electrically connected to the vision computer 5. Specifically, the touch screen 9 is electrically connected to the main processor board 502 and the graphics card 503 of the vision computer 5 via a cable. The touch screen 9 is used to display the size measurement and defect detection results of the part 10 under test. It can also directly display the acquired images and set the image templates, system parameters, etc. required for the operation of the device, so as to improve the universality of the system and the convenience of human-computer interaction.
[0036] The part size measurement and defect detection device of this embodiment, through the setting of conveyor belt 101 and various sensors at the same station, enables the vision industrial camera 3 to automatically acquire visual image information of the measured part 10 for measuring dimensions and inspecting defects at the same station. Its working process is as follows:
[0037] Adjust the focus adjustment handwheel 2021 on the camera clip 202 to make the vision industrial camera 3 focus precisely; adjust the installation height of the sliding light source bracket 203, and then adjust the power supply voltage of the dual-channel adjustable power module 8 to the ring LED light source 6 so that the red light source can evenly and softly illuminate the area of a predetermined size on the conveyor belt 101.
[0038] When the conveyor 1 is powered on, when the starting positioning magnetic block 103 passes through the Hall sensor switch 403, it triggers the vision computer 5 to delay and control the vision industrial camera 3 to acquire the image of the calibration checkerboard 102 and display the image on the touch screen 9. The vision computer 5 uses the checkerboard calibration method to calibrate the ratio of the optical pixel resolution to the physical size of the vision industrial camera 3 and caches the value for use in the size measurement stage of the main processor board 502.
[0039] When the part under test 10 on the conveyor 1 passes through the laser emitter 401 and the laser receiver 402, the vision computer 5 is triggered to delay and control the vision industrial camera 3 to acquire a high-definition black and white digital image of the part under test 10, and the image is displayed on the touch screen 9.
[0040] The visual computer 5 first uses median filtering to remove high-definition black and white digital images to obtain an enhanced image. Then, using the edge features of a part template image preset by the touch screen 9 as a template, the search space is determined according to the parameters preset by the touch screen 9. Targets similar to the preset part template image are searched in the enhanced image, and the image geometric transformation matrix is calculated. Next, the image geometric transformation matrix is applied to the enhanced image to perform geometric transformation to obtain a registered image. Finally, based on the part border preset by the touch screen 9, the registered image is cropped to obtain a central part image, which is then displayed on the touch screen 9.
[0041] The vision computer 5 schedules multi-core CPU resources and, based on the size measurement template preset by the touch screen 9, sequentially performs part edge detection and extraction, edge size pixel measurement, and physical unit conversion calculation to obtain the physical dimensions of the measured part 10. At the same time, the vision computer 5 schedules GPU resources and applies a defect model (such as the YOLOv11n-grayscale defect model) to sequentially perform preprocessing, model inference, result transposition, and postprocessing to complete the inspection of part defects and obtain defect type and location data.
[0042] The vision computer 5 then determines the defect type, location data, and dimensional measurement results based on the inspection requirements preset by the touch screen 9. The defect detection results, dimensional measurement results, and inspection results are displayed on the touch screen 9 in real time. Finally, the various result data are summarized, formatted, and sent to other equipment on the automated production line that requires the data via Ethernet or other communication ports to complete a single inspection and measurement. Multiple continuous measurements and inspections can be performed through the above process.
[0043] It is understood that the visual computer 5 of this utility model is used to obtain the size measurement and defect detection results of the tested part 10 based on the image acquired by the visual industrial camera 3 and through visual information processing. The image processing, such as median filtering, image matching, image template, size measurement template setting, and defect model training and acquisition, are all existing mature processes. The relevant settings can be implemented with reference to existing related technologies, so they are not described in detail, and this utility model does not limit them.
[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not expressly listed. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device comprising said element. Terms such as "connected" or "linked" are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect. The orientations or positional relationships indicated by terms such as "upper," "lower," "left," and "right" are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.
[0045] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.
Claims
1. A device for measuring the dimensions of parts and detecting defects, characterized in that, include: Conveyor, fine-tuning bracket, industrial vision camera, ring-shaped LED light source, dual-sensor triggering module and vision computer; The fine-tuning bracket is fixed to one side of the conveyor table, and the vision industrial camera is suspended on the fine-tuning bracket; The conveyor is located below the industrial vision camera, and the dual-sensor triggering module is mounted on the conveyor. The lower part of the vision industrial camera is connected to a telecentric lens via a thread. A ring-shaped LED light source is provided below the telecentric lens, and the ring-shaped LED light source is suspended on the fine-tuning bracket. The area on the conveyor platform located below the vision computer is set as a vision detection area, and strip-shaped LED light sources are arranged opposite each other on both sides of the conveyor platform near the vision detection area. The dual-sensor triggering module includes a laser emitter, a laser receiver, and a Hall effect sensor switch. The laser emitter and the laser receiver are arranged opposite each other on both sides of the conveyor platform, and the Hall effect sensor switch is located on one edge of the conveyor platform. The conveyor belt of the conveyor platform is provided with a starting positioning magnetic block and a calibration checkerboard. The vision computer is electrically connected to the vision industrial camera and the dual-sensor triggering module, respectively. The part under test is placed on the conveyor belt. When the part under test blocks the laser receiver, the vision industrial camera is triggered to acquire an image of the part under test. When the starting positioning magnetic block approaches the Hall sensor switch, the vision industrial camera is triggered to acquire an image of the calibration checkerboard to calibrate the camera size ratio. The vision computer performs size measurement and defect detection based on the image of the part under test and the calibrated camera size ratio.
2. The part size measurement and defect detection device according to claim 1, characterized in that, The fine-tuning bracket includes: a vertical support rod, a fine-tuning camera clip, and a sliding light source bracket. The fine-tuning camera clip is sleeved on the vertical support rod. The position of the fine-tuning camera clip relative to the vertical support rod is adjusted by an adjusting component. The fine-tuning camera clip is used to fix the vision industrial camera. The sliding light source frame is sleeved on the vertical support rod and slides relative to the vertical support rod. The sliding light source frame is locked to the vertical support rod by a locking member, and the sliding light source frame is used to fix the annular LED light source.
3. The part size measurement and defect detection device according to claim 2, characterized in that, The adjustment component includes a focus adjustment handwheel, which is used to adjust the position of the fine-tuning camera clamp along the axial direction of the vertical support rod so that the vision industrial camera focuses on the surface of the part under test or the calibration checkerboard.
4. The part size measurement and defect detection device according to claim 1, characterized in that, The laser emitter, the laser receiver, and the Hall effect sensor switch are electrically connected to the sensor junction box, which is connected to the vision computer via an I / O interface board.
5. The part size measurement and defect detection device according to claim 1, characterized in that, The vision computer integrates a main processor board and a graphics card. The main processor board is used for size measurement, and the graphics card is used for defect detection.
6. The part size measurement and defect detection device according to claim 4, characterized in that, Also includes: A dual-channel adjustable power supply module provides power to the laser emitter, the laser receiver, the Hall effect sensor switch, and the ring-shaped LED light source respectively through the sensor junction box.
7. The part size measurement and defect detection device according to claim 1, characterized in that, Also includes: A touch screen, electrically connected to the vision computer, is used to display the dimensional measurement and defect detection results of the part under test.