Multi-angle automatic visual inspection device for workpiece appearance inspection

Abstract

The utility model discloses a multi-angle automatic visual inspection device for workpiece appearance inspection, which is characterized in that a lifting mounting plate of the device is arranged in a rack, the center of the lifting mounting plate and front and rear plates of the rack are provided with through holes, a plurality of sliding tables are uniformly distributed on the lifting mounting plate, and a plurality of digital cameras and a plurality of laser range finders are arranged on the plurality of sliding tables; the telescopic servo motors are arranged at the tail ends of the sliding tables, a connecting plate is arranged on the top face of the rack, the lifting connecting rod is arranged in the middle of the top face of the lifting mounting plate and extends out of the connecting plate, and the lifting servo motors are arranged on the connecting plate and drive the lifting connecting rod to drive the lifting mounting plate to ascend and descend. The limit switch is arranged on the side face of the lower portion of the mounting plate and controls the limit lifting position of the lifting mounting plate through the limit block, and the industrial personal computer is arranged on the lower portion of the rack and electrically connected with electrical elements of the device. The device avoids missing detection and error detection, ensures that a good visual detection image is obtained, improves the efficiency and accuracy of visual detection, and avoids the circulation of defective products.

Description

Technical Field

[0001] The utility model relates to the technical field of visual inspection, in particular to a multi-angle automatic visual inspection device for workpiece appearance inspection. Background Technique

[0002] With the development of science and technology, especially the wide application of computer technology, the development has driven products marked with numbers, such as digital cameras, digital video cameras, digital learning machines and other digital products, replacing traditional products. With the increasing number of digital products, digital electronic modules have begun to enter the stage of automated production. The production mode needs to be high-speed, high-precision, high-resolution, high-stability, strong adaptability and capable of continuous operation for a long time in effective quality control. For the traditional visual inspection work of workpiece appearance during the production operation process, it is usually carried out by manual visual inspection one by one, which has low efficiency and is prone to missed inspection and misjudgment, and can no longer meet the requirements of production operation. Therefore, it is necessary to develop a digital electronic visual inspection system that can improve the efficiency and stability of visual inspection.

[0003] Visual inspection is to use a machine to replace the human eye to measure and judge products. The image of the product to be inspected is collected by an image acquisition device and converted into image information. The image information is transmitted to a dedicated image processing system. According to information such as pixel distribution, brightness, and color, it is converted into a digital signal; the image processing system performs various operations on the digital signal to extract target features, and then discriminates features such as product defects, and makes corresponding controls on the production equipment according to the discrimination results. Visual inspection is a valuable monitoring mechanism for production operations such as production, assembly, or packaging, and it has inestimable value in defect detection and preventing the circulation of defective products. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a multi-angle automatic visual inspection device for workpiece appearance inspection. This device overcomes the defects of traditional visual inspection of workpieces, avoids missed inspection and misjudgment, ensures obtaining good visual inspection images, effectively improves the efficiency and accuracy of visual inspection, and prevents the circulation of defective products.

[0005] To solve the above technical problems, the multi-angle automatic vision inspection device for workpiece appearance inspection of the present utility model includes a frame, a lifting mounting plate, a plurality of digital cameras, a plurality of laser rangefinders, a plurality of sliding tables, a plurality of telescopic servo motors, a lifting connecting rod, a lifting servo motor, a limit switch, and an industrial control computer. The lifting mounting plate is arranged inside the frame. Through holes are respectively opened at the center of the lifting mounting plate and the front and rear plates of the frame. And in the initial position, the through hole at the center of the lifting mounting plate is coaxially arranged with the through holes of the front and rear plates of the frame. The plurality of sliding tables are evenly distributed around the center of the lifting mounting plate on the lifting mounting plate. The plurality of digital cameras and the plurality of laser rangefinders are arranged on the plurality of sliding tables. The plurality of telescopic servo motors are arranged at the ends of the plurality of sliding tables and drive the plurality of digital cameras and the plurality of laser rangefinders to move along the plurality of sliding tables. A connecting plate is provided on the top surface of the frame. The lifting connecting rod is centrally arranged on the top surface of the lifting mounting plate and extends out of the connecting plate. The lifting servo motor is arranged on the connecting plate and drives the lifting connecting rod to drive the lifting mounting plate to lift and lower. The limit switch is arranged on the lower side surface of the lifting mounting plate and controls the extreme lifting and lowering positions of the lifting mounting plate through a limit block. The industrial control computer is arranged at the lower part of the frame and is electrically connected to the plurality of digital cameras, the plurality of laser rangefinders, the plurality of telescopic servo motors, the lifting servo motor, and the limit switch respectively.

[0006] Further, the plurality of telescopic servo motors synchronously drive the plurality of digital cameras and the plurality of laser rangefinders to move along the plurality of sliding tables, and the plurality of digital cameras keep the same distance from the center of the lifting mounting plate by ranging through the plurality of laser rangefinders.

[0007] Further, the number of the plurality of digital cameras, the plurality of laser rangefinders, the plurality of sliding tables, and the plurality of telescopic servo motors are six respectively, and the included angle between adjacent sliding tables is 60 degrees.

[0008] Further, the plurality of digital cameras are industrial-grade 3D cameras.

[0009] Further, windows are respectively opened on the front plate of the frame at the positions where the plurality of sliding tables are arranged on the lifting mounting plate, and covers are provided on the windows through hinges and latches.

[0010] Further, a sliding sleeve is provided on the top surface of the connecting plate, the lifting connecting rod passes through the sliding sleeve, and the lifting servo motor is arranged on the side surface of the sliding sleeve and drives the lifting connecting rod to lift and lower.

[0011] Since the multi-angle automated visual inspection device for workpiece appearance inspection of the utility model adopts the above-mentioned technical scheme, that is, the lifting and mounting plate of the device is arranged in the frame, the center of the lifting and mounting plate and the front plate and the rear plate of the frame are respectively provided with through holes, a number of slides are evenly distributed on the lifting and mounting plate around the center of the lifting and mounting plate, a number of digital cameras and a number of laser rangefinders are arranged on the number of slides, a number of telescopic servo motors are arranged at the ends of the number of slides and drive the number of digital cameras and the number of laser rangefinders to move along the number of slides, a connecting plate is arranged on the top surface of the frame, a lifting and lowering connecting rod is centrally arranged on the top surface of the lifting and lowering mounting plate and extends out of the connecting plate, a lifting and lowering servo motor is arranged on the connecting plate and drives the lifting and lowering connecting rod to drive the lifting and lowering mounting plate, a limit switch is arranged on the lower side of the mounting plate and controls the extreme lifting position of the lifting and lowering mounting plate through a limit block, and an industrial computer is arranged at the lower part of the frame and is electrically connected to the number of digital cameras, the number of laser rangefinders, the number of telescopic servo motors, the lifting and lowering servo motor and the limit switch respectively. This device overcomes the defects of traditional visual inspection of workpieces, avoids missed inspections and wrong inspections, ensures the acquisition of good visual inspection images, effectively improves the efficiency and accuracy of visual inspection, and eliminates the circulation of defective products. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples:

[0013] Figure 1 This is a schematic diagram of a multi-angle automated visual inspection device for workpiece appearance inspection according to the utility model;

[0014] Figure 2 This is a schematic diagram of the appearance of the device;

[0015] Figure 3 This is a schematic diagram of the layout of the lifting installation plate in this device.

[0016] Figure 4 This is a flowchart of the information collection and judgment process of this device. DETAILED DESCRIPTION

[0017] Example 1

[0018] like Figure 1 , Figure 2 and Figure 3As shown in the figure, the multi-angle automatic vision inspection device for workpiece appearance inspection of the present utility model includes a frame 1, a lifting mounting plate 2, a plurality of digital cameras 3, a plurality of laser rangefinders 4, a plurality of sliding tables 5, a plurality of telescopic servo motors 6, a lifting connecting rod 7, a lifting servo motor 8, a limit switch 9 and an industrial control computer 10. The lifting mounting plate 2 is arranged inside the frame 1. Through holes 21 and 11 are respectively opened at the center of the lifting mounting plate 2 and the front plate and the rear plate of the frame 1. And in the initial position, the through hole 21 at the center of the lifting mounting plate 2 is coaxially arranged with the through holes 11 of the front plate and the rear plate of the frame 1. The plurality of sliding tables 4 are evenly distributed around the center of the lifting mounting plate 2 on the lifting mounting plate 2. The plurality of digital cameras 3 and the plurality of laser rangefinders 4 are arranged on the plurality of sliding tables 5. The plurality of telescopic servo motors 6 are arranged at the ends of the plurality of sliding tables 5 and drive the plurality of digital cameras 3 and the plurality of laser rangefinders 4 to move along the plurality of sliding tables 5. A connecting plate 12 is arranged on the top surface of the frame 1. The lifting connecting rod 7 is centrally arranged on the top surface of the lifting mounting plate 2 and extends out of the connecting plate 12. The lifting servo motor 8 is arranged on the connecting plate 12 and drives the lifting connecting rod 7 to drive the lifting mounting plate 2 to lift. The limit switch 9 is arranged on the lower side surface of the lifting mounting plate 2 and controls the extreme lifting position of the lifting mounting plate 2 through a limit block 91. The industrial control computer 10 is arranged at the lower part of the frame 1 and is electrically connected to the plurality of digital cameras 3, the plurality of laser rangefinders 4, the plurality of telescopic servo motors 6, the lifting servo motor 8 and the limit switch 9 respectively.

[0019] Preferably, the plurality of telescopic servo motors 6 synchronously drive the plurality of digital cameras 3 and the plurality of laser rangefinders 4 to move along the plurality of sliding tables 5. The plurality of digital cameras 3 keep the same distance from the center of the lifting mounting plate 2 by measuring distances with the plurality of laser rangefinders 4. Ensure that the images obtained by the plurality of digital cameras are consistent, which is convenient for analyzing and identifying the appearance defects of the workpiece.

[0020] Preferably, the plurality of digital cameras 3, the plurality of laser rangefinders 4, the plurality of sliding tables 5 and the plurality of telescopic servo motors 6 are respectively six, and the included angle between adjacent sliding tables 5 is 60 degrees. It is convenient to obtain the overall appearance image of the workpiece without dead angles and realize the inspection of the overall appearance of the workpiece.

[0021] Preferably, the plurality of digital cameras 3 are industrial-grade 3D cameras.

[0022] Preferably, the front plate of the frame 1 is respectively provided with windows 13 at the positions where the plurality of sliding tables 5 are arranged on the lifting mounting plate 2. The windows 13 are provided with cover plates 16 through hinges 14 and latches 15. The setting of the windows and the cover plates is convenient for the maintenance and repair of the digital cameras and the laser rangefinders. When working, the cover plates are closed through the latches to seal the windows. When maintaining and repairing, the latches are unlocked to open the cover plates.

[0023] Preferably, a sliding sleeve 17 is provided on the top surface of the connecting plate 12. The lifting link rod 7 passes through the sliding sleeve 17. The lifting servo motor 8 is arranged on the side of the sliding sleeve 17 and drives the lifting link rod 7 to move up and down. The sliding sleeve is provided to ensure the smooth lifting of the lifting link rod and avoid jamming.

[0024] Embodiment 2

[0025] As Figure 4 shown, when the device is actually applied, the frame is arranged on the material conveying mechanism of the production equipment. The material conveying transmission line passes through the through holes of the frame and the lifting mounting plate. When the incoming workpiece on the material conveying transmission line passes through the through hole of the lifting mounting plate, several digital cameras synchronously collect the image information of the incoming workpiece, so as to obtain the multi-angle image information of the incoming workpiece for the visual inspection of the incoming workpiece on the material conveying transmission line of the production equipment. The lifting link rod of the device is connected to the lifting mounting plate, and the lifting servo motor can drive the lifting mounting plate to move up and down in the frame through the lifting link rod, and the lifting link rod is set according to the specific structure of the material conveying transmission line. During production, according to the size of the incoming workpiece (such as a circular cold pipe), the industrial control computer drives the lifting mounting plate to move up and down through the lifting servo motor and the lifting link rod, so that the through hole in the center of the lifting mounting plate is aligned with the center of the incoming workpiece. At the same time, according to the need of image information collection, several telescopic servo motors can be used to synchronously drive several digital cameras to move along several sliding tables, and several laser rangefinders are used to ensure that the distances between several digital cameras and the incoming workpiece are the same. The device realizes the visual inspection of the incoming workpiece through several digital cameras. It is necessary to ensure that the distances between several digital cameras and the incoming workpiece are kept the same. According to the ranging data of several laser rangefinders, several telescopic servo motors can be used to synchronously drive several digital cameras to move along several sliding tables to change the distances between several digital cameras and the incoming workpiece, so as to ensure that the distances between each digital camera and the incoming workpiece are the same. Several laser rangefinders transmit the distance information to the industrial control computer in real time, and the industrial control computer controls several telescopic servo motors to adjust the distances between several digital cameras and the incoming workpiece, so as to obtain the required image information, that is, the device always keeps the visual inspection center consistent with the center of the object to be measured to ensure good visual inspection images.

[0026] The image information collected by several digital cameras of the device is transmitted to the upper computer through the industrial control computer. The upper computer displays the collected image information through the display device and performs corresponding processing on the image information to make judgments on features such as defects. Among them, the limit switch is used to control the lifting stroke of the lifting mounting plate to avoid collision between the lifting mounting plate and other equipment, playing a reliable protection role. The device can assist manual visual inspection, improve the visual inspection efficiency and detection accuracy; at the same time, the inspectors can avoid contacting the object to be measured and realize non-contact detection.

Claims

1. A multi-angle automated visual inspection device for workpiece appearance inspection, characterized in that: The invention comprises a frame, a lifting installation plate, a plurality of digital cameras, a plurality of laser rangefinders, a plurality of slides, a plurality of telescopic servo motors, a lifting connecting rod, a lifting servo motor, a limit switch and an industrial computer. The lifting installation plate is arranged in the frame. The center of the lifting installation plate and the front plate and the rear plate of the frame are respectively provided with through holes. In the initial position, the through hole in the center of the lifting installation plate is coaxially arranged with the through holes in the front plate and the rear plate of the frame. The plurality of slides are uniformly distributed on the lifting installation plate around the center of the lifting installation plate. The plurality of digital cameras and the plurality of laser rangefinders are arranged on the plurality of slides. The plurality of telescopic servo motors are arranged on the plurality of The ends of the slides drive the digital cameras and the laser rangefinders to move along the slides. A connecting plate is provided on the top of the frame. The lifting connecting rod is centrally arranged on the top of the lifting mounting plate and extends out of the connecting plate. The lifting servo motor is arranged on the connecting plate and drives the lifting connecting rod to lift the lifting mounting plate. The limit switch is arranged on the lower side of the lifting mounting plate and controls the extreme lifting position of the lifting mounting plate through the limit block. The industrial computer is arranged at the lower part of the frame and is electrically connected to the digital cameras, the laser rangefinders, the telescopic servo motors, the lifting servo motor and the limit switch respectively.

2. The multi-angle automated visual inspection device for workpiece appearance inspection according to claim 1, characterized in that: The plurality of telescopic servo motors synchronously drive the plurality of digital cameras and the plurality of laser rangefinders to move along the plurality of slides, and the plurality of digital cameras measure distances through the plurality of laser rangefinders to maintain a consistent distance from the center of the lifting installation plate.

3. The multi-angle automatic visual inspection device for workpiece appearance inspection according to claim 1 or 2, characterized in that: The number of the digital cameras, the number of laser rangefinders, the number of slides and the number of telescopic servo motors are six respectively, and the angle between adjacent slides is 60 degrees.

4. The multi-angle automated visual inspection device for workpiece appearance inspection according to claim 3 is characterized in that: The plurality of digital cameras are industrial-grade 3D cameras.

5. The multi-angle automated visual inspection device for workpiece appearance inspection according to claim 3, characterized in that: The front plate of the frame is provided with windows at positions where the lifting and mounting plate is provided with a plurality of slides, and the windows are provided with cover plates through hinges and locks.

6. The multi-angle automated visual inspection device for workpiece appearance inspection according to claim 3, characterized in that: A sliding sleeve is provided on the top surface of the connecting plate, the lifting connecting rod passes through the sliding sleeve, and the lifting servo motor is arranged on the side of the sliding sleeve and drives the lifting connecting rod to move up and down.

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